Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Linux INET6 implementation | |
4 | * FIB front-end. | |
5 | * | |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | */ |
9 | ||
10 | /* Changes: | |
11 | * | |
12 | * YOSHIFUJI Hideaki @USAGI | |
13 | * reworked default router selection. | |
14 | * - respect outgoing interface | |
15 | * - select from (probably) reachable routers (i.e. | |
16 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
17 | * - always select the same router if it is (probably) | |
18 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
19 | * Ville Nuorvala |
20 | * Fixed routing subtrees. | |
1da177e4 LT |
21 | */ |
22 | ||
f3213831 JP |
23 | #define pr_fmt(fmt) "IPv6: " fmt |
24 | ||
4fc268d2 | 25 | #include <linux/capability.h> |
1da177e4 | 26 | #include <linux/errno.h> |
bc3b2d7f | 27 | #include <linux/export.h> |
1da177e4 LT |
28 | #include <linux/types.h> |
29 | #include <linux/times.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/route.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/in6.h> | |
7bc570c8 | 36 | #include <linux/mroute6.h> |
1da177e4 | 37 | #include <linux/init.h> |
1da177e4 | 38 | #include <linux/if_arp.h> |
1da177e4 LT |
39 | #include <linux/proc_fs.h> |
40 | #include <linux/seq_file.h> | |
5b7c931d | 41 | #include <linux/nsproxy.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
35732d01 | 43 | #include <linux/jhash.h> |
4785305c | 44 | #include <linux/siphash.h> |
457c4cbc | 45 | #include <net/net_namespace.h> |
1da177e4 LT |
46 | #include <net/snmp.h> |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
904af04d | 55 | #include <net/dst_metadata.h> |
1da177e4 | 56 | #include <net/xfrm.h> |
8d71740c | 57 | #include <net/netevent.h> |
21713ebc | 58 | #include <net/netlink.h> |
3c618c1d | 59 | #include <net/rtnh.h> |
19e42e45 | 60 | #include <net/lwtunnel.h> |
904af04d | 61 | #include <net/ip_tunnels.h> |
ca254490 | 62 | #include <net/l3mdev.h> |
eacb9384 | 63 | #include <net/ip.h> |
7c0f6ba6 | 64 | #include <linux/uaccess.h> |
951cf368 | 65 | #include <linux/btf_ids.h> |
1da177e4 LT |
66 | |
67 | #ifdef CONFIG_SYSCTL | |
68 | #include <linux/sysctl.h> | |
69 | #endif | |
70 | ||
30d444d3 DA |
71 | static int ip6_rt_type_to_error(u8 fib6_type); |
72 | ||
73 | #define CREATE_TRACE_POINTS | |
74 | #include <trace/events/fib6.h> | |
75 | EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup); | |
76 | #undef CREATE_TRACE_POINTS | |
77 | ||
afc154e9 | 78 | enum rt6_nud_state { |
7e980569 JB |
79 | RT6_NUD_FAIL_HARD = -3, |
80 | RT6_NUD_FAIL_PROBE = -2, | |
81 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
82 | RT6_NUD_SUCCEED = 1 |
83 | }; | |
84 | ||
bbd807df BV |
85 | INDIRECT_CALLABLE_SCOPE |
86 | struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 87 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
f67fbeae BV |
88 | INDIRECT_CALLABLE_SCOPE |
89 | unsigned int ip6_mtu(const struct dst_entry *dst); | |
1da177e4 LT |
90 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
91 | static void ip6_dst_destroy(struct dst_entry *); | |
92 | static void ip6_dst_ifdown(struct dst_entry *, | |
93 | struct net_device *dev, int how); | |
569d3645 | 94 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
95 | |
96 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 97 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 98 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 99 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 100 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 | 101 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
102 | struct sk_buff *skb, u32 mtu, |
103 | bool confirm_neigh); | |
6700c270 DM |
104 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, |
105 | struct sk_buff *skb); | |
702cea56 DA |
106 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
107 | int strict); | |
a1b7a1f0 | 108 | static size_t rt6_nlmsg_size(struct fib6_info *f6i); |
d4ead6b3 | 109 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 110 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 111 | struct in6_addr *dest, struct in6_addr *src, |
16a16cd3 DA |
112 | int iif, int type, u32 portid, u32 seq, |
113 | unsigned int flags); | |
7e4b5128 | 114 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
115 | const struct in6_addr *daddr, |
116 | const struct in6_addr *saddr); | |
1da177e4 | 117 | |
70ceb4f5 | 118 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 119 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 120 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
121 | const struct in6_addr *gwaddr, |
122 | struct net_device *dev, | |
95c96174 | 123 | unsigned int pref); |
8d1c802b | 124 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 125 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
126 | const struct in6_addr *gwaddr, |
127 | struct net_device *dev); | |
70ceb4f5 YH |
128 | #endif |
129 | ||
8d0b94af MKL |
130 | struct uncached_list { |
131 | spinlock_t lock; | |
132 | struct list_head head; | |
ba55ef81 | 133 | struct list_head quarantine; |
8d0b94af MKL |
134 | }; |
135 | ||
136 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
137 | ||
510c321b | 138 | void rt6_uncached_list_add(struct rt6_info *rt) |
8d0b94af MKL |
139 | { |
140 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
141 | ||
8d0b94af MKL |
142 | rt->rt6i_uncached_list = ul; |
143 | ||
144 | spin_lock_bh(&ul->lock); | |
145 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
146 | spin_unlock_bh(&ul->lock); | |
147 | } | |
148 | ||
510c321b | 149 | void rt6_uncached_list_del(struct rt6_info *rt) |
8d0b94af MKL |
150 | { |
151 | if (!list_empty(&rt->rt6i_uncached)) { | |
152 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
153 | ||
154 | spin_lock_bh(&ul->lock); | |
ba55ef81 | 155 | list_del_init(&rt->rt6i_uncached); |
8d0b94af MKL |
156 | spin_unlock_bh(&ul->lock); |
157 | } | |
158 | } | |
159 | ||
e5f80fcf | 160 | static void rt6_uncached_list_flush_dev(struct net_device *dev) |
8d0b94af | 161 | { |
8d0b94af MKL |
162 | int cpu; |
163 | ||
164 | for_each_possible_cpu(cpu) { | |
165 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
ba55ef81 ED |
166 | struct rt6_info *rt, *safe; |
167 | ||
168 | if (list_empty(&ul->head)) | |
169 | continue; | |
8d0b94af MKL |
170 | |
171 | spin_lock_bh(&ul->lock); | |
ba55ef81 | 172 | list_for_each_entry_safe(rt, safe, &ul->head, rt6i_uncached) { |
8d0b94af MKL |
173 | struct inet6_dev *rt_idev = rt->rt6i_idev; |
174 | struct net_device *rt_dev = rt->dst.dev; | |
ba55ef81 | 175 | bool handled = false; |
8d0b94af | 176 | |
e332bc67 | 177 | if (rt_idev->dev == dev) { |
e5f80fcf | 178 | rt->rt6i_idev = in6_dev_get(blackhole_netdev); |
8d0b94af | 179 | in6_dev_put(rt_idev); |
ba55ef81 | 180 | handled = true; |
8d0b94af MKL |
181 | } |
182 | ||
e332bc67 | 183 | if (rt_dev == dev) { |
8d7017fd | 184 | rt->dst.dev = blackhole_netdev; |
d62607c3 JK |
185 | netdev_ref_replace(rt_dev, blackhole_netdev, |
186 | &rt->dst.dev_tracker, | |
187 | GFP_ATOMIC); | |
ba55ef81 | 188 | handled = true; |
8d0b94af | 189 | } |
ba55ef81 ED |
190 | if (handled) |
191 | list_move(&rt->rt6i_uncached, | |
192 | &ul->quarantine); | |
8d0b94af MKL |
193 | } |
194 | spin_unlock_bh(&ul->lock); | |
195 | } | |
196 | } | |
197 | ||
f8a1b43b | 198 | static inline const void *choose_neigh_daddr(const struct in6_addr *p, |
f894cbf8 DM |
199 | struct sk_buff *skb, |
200 | const void *daddr) | |
39232973 | 201 | { |
a7563f34 | 202 | if (!ipv6_addr_any(p)) |
39232973 | 203 | return (const void *) p; |
f894cbf8 DM |
204 | else if (skb) |
205 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
206 | return daddr; |
207 | } | |
208 | ||
f8a1b43b DA |
209 | struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
210 | struct net_device *dev, | |
211 | struct sk_buff *skb, | |
212 | const void *daddr) | |
d3aaeb38 | 213 | { |
39232973 DM |
214 | struct neighbour *n; |
215 | ||
f8a1b43b DA |
216 | daddr = choose_neigh_daddr(gw, skb, daddr); |
217 | n = __ipv6_neigh_lookup(dev, daddr); | |
f83c7790 DM |
218 | if (n) |
219 | return n; | |
7adf3246 SB |
220 | |
221 | n = neigh_create(&nd_tbl, daddr, dev); | |
222 | return IS_ERR(n) ? NULL : n; | |
f8a1b43b DA |
223 | } |
224 | ||
225 | static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst, | |
226 | struct sk_buff *skb, | |
227 | const void *daddr) | |
228 | { | |
229 | const struct rt6_info *rt = container_of(dst, struct rt6_info, dst); | |
230 | ||
2c6b55f4 ND |
231 | return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any), |
232 | dst->dev, skb, daddr); | |
f83c7790 DM |
233 | } |
234 | ||
63fca65d JA |
235 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
236 | { | |
237 | struct net_device *dev = dst->dev; | |
238 | struct rt6_info *rt = (struct rt6_info *)dst; | |
239 | ||
cbfd6891 | 240 | daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr); |
63fca65d JA |
241 | if (!daddr) |
242 | return; | |
243 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
244 | return; | |
245 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
246 | return; | |
247 | __ipv6_confirm_neigh(dev, daddr); | |
248 | } | |
249 | ||
9a7ec3a9 | 250 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 251 | .family = AF_INET6, |
1da177e4 LT |
252 | .gc = ip6_dst_gc, |
253 | .gc_thresh = 1024, | |
254 | .check = ip6_dst_check, | |
0dbaee3b | 255 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 256 | .mtu = ip6_mtu, |
d4ead6b3 | 257 | .cow_metrics = dst_cow_metrics_generic, |
1da177e4 LT |
258 | .destroy = ip6_dst_destroy, |
259 | .ifdown = ip6_dst_ifdown, | |
260 | .negative_advice = ip6_negative_advice, | |
261 | .link_failure = ip6_link_failure, | |
262 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 263 | .redirect = rt6_do_redirect, |
9f8955cc | 264 | .local_out = __ip6_local_out, |
f8a1b43b | 265 | .neigh_lookup = ip6_dst_neigh_lookup, |
63fca65d | 266 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
267 | }; |
268 | ||
14e50e57 | 269 | static struct dst_ops ip6_dst_blackhole_ops = { |
c4c877b2 DB |
270 | .family = AF_INET6, |
271 | .default_advmss = ip6_default_advmss, | |
272 | .neigh_lookup = ip6_dst_neigh_lookup, | |
273 | .check = ip6_dst_check, | |
274 | .destroy = ip6_dst_destroy, | |
275 | .cow_metrics = dst_cow_metrics_generic, | |
276 | .update_pmtu = dst_blackhole_update_pmtu, | |
277 | .redirect = dst_blackhole_redirect, | |
278 | .mtu = dst_blackhole_mtu, | |
14e50e57 DM |
279 | }; |
280 | ||
62fa8a84 | 281 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 282 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
283 | }; |
284 | ||
8d1c802b | 285 | static const struct fib6_info fib6_null_entry_template = { |
93c2fb25 DA |
286 | .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP), |
287 | .fib6_protocol = RTPROT_KERNEL, | |
288 | .fib6_metric = ~(u32)0, | |
f05713e0 | 289 | .fib6_ref = REFCOUNT_INIT(1), |
421842ed DA |
290 | .fib6_type = RTN_UNREACHABLE, |
291 | .fib6_metrics = (struct dst_metrics *)&dst_default_metrics, | |
292 | }; | |
293 | ||
fb0af4c7 | 294 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
295 | .dst = { |
296 | .__refcnt = ATOMIC_INIT(1), | |
297 | .__use = 1, | |
2c20cbd7 | 298 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 299 | .error = -ENETUNREACH, |
d8d1f30b CG |
300 | .input = ip6_pkt_discard, |
301 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
302 | }, |
303 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
1da177e4 LT |
304 | }; |
305 | ||
101367c2 TG |
306 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
307 | ||
fb0af4c7 | 308 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
309 | .dst = { |
310 | .__refcnt = ATOMIC_INIT(1), | |
311 | .__use = 1, | |
2c20cbd7 | 312 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 313 | .error = -EACCES, |
d8d1f30b CG |
314 | .input = ip6_pkt_prohibit, |
315 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
316 | }, |
317 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
318 | }; |
319 | ||
fb0af4c7 | 320 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
321 | .dst = { |
322 | .__refcnt = ATOMIC_INIT(1), | |
323 | .__use = 1, | |
2c20cbd7 | 324 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 325 | .error = -EINVAL, |
d8d1f30b | 326 | .input = dst_discard, |
ede2059d | 327 | .output = dst_discard_out, |
101367c2 TG |
328 | }, |
329 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
330 | }; |
331 | ||
332 | #endif | |
333 | ||
ebfa45f0 MKL |
334 | static void rt6_info_init(struct rt6_info *rt) |
335 | { | |
8f2a83b4 | 336 | memset_after(rt, 0, dst); |
ebfa45f0 MKL |
337 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
338 | } | |
339 | ||
1da177e4 | 340 | /* allocate dst with ip6_dst_ops */ |
93531c67 DA |
341 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
342 | int flags) | |
1da177e4 | 343 | { |
97bab73f | 344 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
b2a9c0ed | 345 | 1, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 346 | |
81eb8447 | 347 | if (rt) { |
ebfa45f0 | 348 | rt6_info_init(rt); |
81eb8447 WW |
349 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
350 | } | |
8104891b | 351 | |
cf911662 | 352 | return rt; |
1da177e4 | 353 | } |
9ab179d8 | 354 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 355 | |
1da177e4 LT |
356 | static void ip6_dst_destroy(struct dst_entry *dst) |
357 | { | |
358 | struct rt6_info *rt = (struct rt6_info *)dst; | |
a68886a6 | 359 | struct fib6_info *from; |
8d0b94af | 360 | struct inet6_dev *idev; |
1da177e4 | 361 | |
1620a336 | 362 | ip_dst_metrics_put(dst); |
8d0b94af MKL |
363 | rt6_uncached_list_del(rt); |
364 | ||
365 | idev = rt->rt6i_idev; | |
38308473 | 366 | if (idev) { |
1da177e4 LT |
367 | rt->rt6i_idev = NULL; |
368 | in6_dev_put(idev); | |
1ab1457c | 369 | } |
1716a961 | 370 | |
0e233874 | 371 | from = xchg((__force struct fib6_info **)&rt->from, NULL); |
93531c67 | 372 | fib6_info_release(from); |
b3419363 DM |
373 | } |
374 | ||
1da177e4 LT |
375 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
376 | int how) | |
377 | { | |
378 | struct rt6_info *rt = (struct rt6_info *)dst; | |
379 | struct inet6_dev *idev = rt->rt6i_idev; | |
380 | ||
e5f80fcf ED |
381 | if (idev && idev->dev != blackhole_netdev) { |
382 | struct inet6_dev *blackhole_idev = in6_dev_get(blackhole_netdev); | |
383 | ||
384 | if (blackhole_idev) { | |
385 | rt->rt6i_idev = blackhole_idev; | |
e5645f51 | 386 | in6_dev_put(idev); |
97cac082 | 387 | } |
1da177e4 LT |
388 | } |
389 | } | |
390 | ||
5973fb1e MKL |
391 | static bool __rt6_check_expired(const struct rt6_info *rt) |
392 | { | |
393 | if (rt->rt6i_flags & RTF_EXPIRES) | |
394 | return time_after(jiffies, rt->dst.expires); | |
395 | else | |
396 | return false; | |
397 | } | |
398 | ||
a50feda5 | 399 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 400 | { |
a68886a6 DA |
401 | struct fib6_info *from; |
402 | ||
403 | from = rcu_dereference(rt->from); | |
404 | ||
1716a961 G |
405 | if (rt->rt6i_flags & RTF_EXPIRES) { |
406 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 407 | return true; |
a68886a6 | 408 | } else if (from) { |
1e2ea8ad | 409 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
a68886a6 | 410 | fib6_check_expired(from); |
1716a961 | 411 | } |
a50feda5 | 412 | return false; |
1da177e4 LT |
413 | } |
414 | ||
b1d40991 DA |
415 | void fib6_select_path(const struct net *net, struct fib6_result *res, |
416 | struct flowi6 *fl6, int oif, bool have_oif_match, | |
417 | const struct sk_buff *skb, int strict) | |
51ebd318 | 418 | { |
8d1c802b | 419 | struct fib6_info *sibling, *next_sibling; |
b1d40991 DA |
420 | struct fib6_info *match = res->f6i; |
421 | ||
34fe5a1c | 422 | if (!match->nh && (!match->fib6_nsiblings || have_oif_match)) |
b1d40991 | 423 | goto out; |
51ebd318 | 424 | |
34fe5a1c DA |
425 | if (match->nh && have_oif_match && res->nh) |
426 | return; | |
427 | ||
b673d6cc JS |
428 | /* We might have already computed the hash for ICMPv6 errors. In such |
429 | * case it will always be non-zero. Otherwise now is the time to do it. | |
430 | */ | |
f88d8ea6 DA |
431 | if (!fl6->mp_hash && |
432 | (!match->nh || nexthop_is_multipath(match->nh))) | |
b4bac172 | 433 | fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL); |
b673d6cc | 434 | |
f88d8ea6 DA |
435 | if (unlikely(match->nh)) { |
436 | nexthop_path_fib6_result(res, fl6->mp_hash); | |
437 | return; | |
438 | } | |
439 | ||
1cf844c7 | 440 | if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound)) |
b1d40991 | 441 | goto out; |
3d709f69 | 442 | |
93c2fb25 DA |
443 | list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings, |
444 | fib6_siblings) { | |
1cf844c7 | 445 | const struct fib6_nh *nh = sibling->fib6_nh; |
5e670d84 DA |
446 | int nh_upper_bound; |
447 | ||
702cea56 | 448 | nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound); |
5e670d84 | 449 | if (fl6->mp_hash > nh_upper_bound) |
3d709f69 | 450 | continue; |
702cea56 | 451 | if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0) |
3d709f69 IS |
452 | break; |
453 | match = sibling; | |
454 | break; | |
455 | } | |
456 | ||
b1d40991 DA |
457 | out: |
458 | res->f6i = match; | |
1cf844c7 | 459 | res->nh = match->fib6_nh; |
51ebd318 ND |
460 | } |
461 | ||
1da177e4 | 462 | /* |
66f5d6ce | 463 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
464 | */ |
465 | ||
0c59d006 DA |
466 | static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh, |
467 | const struct in6_addr *saddr, int oif, int flags) | |
468 | { | |
469 | const struct net_device *dev; | |
470 | ||
471 | if (nh->fib_nh_flags & RTNH_F_DEAD) | |
472 | return false; | |
473 | ||
474 | dev = nh->fib_nh_dev; | |
475 | if (oif) { | |
476 | if (dev->ifindex == oif) | |
477 | return true; | |
478 | } else { | |
479 | if (ipv6_chk_addr(net, saddr, dev, | |
480 | flags & RT6_LOOKUP_F_IFACE)) | |
481 | return true; | |
482 | } | |
483 | ||
484 | return false; | |
485 | } | |
486 | ||
962b6803 DA |
487 | struct fib6_nh_dm_arg { |
488 | struct net *net; | |
489 | const struct in6_addr *saddr; | |
490 | int oif; | |
491 | int flags; | |
492 | struct fib6_nh *nh; | |
493 | }; | |
494 | ||
495 | static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg) | |
496 | { | |
497 | struct fib6_nh_dm_arg *arg = _arg; | |
498 | ||
499 | arg->nh = nh; | |
500 | return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif, | |
501 | arg->flags); | |
502 | } | |
503 | ||
504 | /* returns fib6_nh from nexthop or NULL */ | |
505 | static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh, | |
506 | struct fib6_result *res, | |
507 | const struct in6_addr *saddr, | |
508 | int oif, int flags) | |
509 | { | |
510 | struct fib6_nh_dm_arg arg = { | |
511 | .net = net, | |
512 | .saddr = saddr, | |
513 | .oif = oif, | |
514 | .flags = flags, | |
515 | }; | |
516 | ||
517 | if (nexthop_is_blackhole(nh)) | |
518 | return NULL; | |
519 | ||
520 | if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg)) | |
521 | return arg.nh; | |
522 | ||
523 | return NULL; | |
524 | } | |
525 | ||
75ef7389 DA |
526 | static void rt6_device_match(struct net *net, struct fib6_result *res, |
527 | const struct in6_addr *saddr, int oif, int flags) | |
1da177e4 | 528 | { |
75ef7389 DA |
529 | struct fib6_info *f6i = res->f6i; |
530 | struct fib6_info *spf6i; | |
531 | struct fib6_nh *nh; | |
1da177e4 | 532 | |
75ef7389 | 533 | if (!oif && ipv6_addr_any(saddr)) { |
f88d8ea6 DA |
534 | if (unlikely(f6i->nh)) { |
535 | nh = nexthop_fib6_nh(f6i->nh); | |
536 | if (nexthop_is_blackhole(f6i->nh)) | |
537 | goto out_blackhole; | |
538 | } else { | |
539 | nh = f6i->fib6_nh; | |
540 | } | |
7d21fec9 DA |
541 | if (!(nh->fib_nh_flags & RTNH_F_DEAD)) |
542 | goto out; | |
75ef7389 | 543 | } |
dd3abc4e | 544 | |
75ef7389 | 545 | for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) { |
962b6803 DA |
546 | bool matched = false; |
547 | ||
548 | if (unlikely(spf6i->nh)) { | |
549 | nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr, | |
550 | oif, flags); | |
551 | if (nh) | |
552 | matched = true; | |
553 | } else { | |
554 | nh = spf6i->fib6_nh; | |
555 | if (__rt6_device_match(net, nh, saddr, oif, flags)) | |
556 | matched = true; | |
557 | } | |
558 | if (matched) { | |
75ef7389 | 559 | res->f6i = spf6i; |
7d21fec9 | 560 | goto out; |
75ef7389 | 561 | } |
dd3abc4e | 562 | } |
1da177e4 | 563 | |
75ef7389 DA |
564 | if (oif && flags & RT6_LOOKUP_F_IFACE) { |
565 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 566 | nh = res->f6i->fib6_nh; |
7d21fec9 | 567 | goto out; |
75ef7389 | 568 | } |
8067bb8c | 569 | |
f88d8ea6 DA |
570 | if (unlikely(f6i->nh)) { |
571 | nh = nexthop_fib6_nh(f6i->nh); | |
572 | if (nexthop_is_blackhole(f6i->nh)) | |
573 | goto out_blackhole; | |
574 | } else { | |
575 | nh = f6i->fib6_nh; | |
576 | } | |
577 | ||
7d21fec9 | 578 | if (nh->fib_nh_flags & RTNH_F_DEAD) { |
75ef7389 | 579 | res->f6i = net->ipv6.fib6_null_entry; |
1cf844c7 | 580 | nh = res->f6i->fib6_nh; |
75ef7389 | 581 | } |
7d21fec9 DA |
582 | out: |
583 | res->nh = nh; | |
584 | res->fib6_type = res->f6i->fib6_type; | |
585 | res->fib6_flags = res->f6i->fib6_flags; | |
f88d8ea6 DA |
586 | return; |
587 | ||
588 | out_blackhole: | |
589 | res->fib6_flags |= RTF_REJECT; | |
590 | res->fib6_type = RTN_BLACKHOLE; | |
591 | res->nh = nh; | |
1da177e4 LT |
592 | } |
593 | ||
27097255 | 594 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
595 | struct __rt6_probe_work { |
596 | struct work_struct work; | |
597 | struct in6_addr target; | |
598 | struct net_device *dev; | |
fb67510b | 599 | netdevice_tracker dev_tracker; |
c2f17e82 HFS |
600 | }; |
601 | ||
602 | static void rt6_probe_deferred(struct work_struct *w) | |
603 | { | |
604 | struct in6_addr mcaddr; | |
605 | struct __rt6_probe_work *work = | |
606 | container_of(w, struct __rt6_probe_work, work); | |
607 | ||
608 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 609 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
d62607c3 | 610 | netdev_put(work->dev, &work->dev_tracker); |
662f5533 | 611 | kfree(work); |
c2f17e82 HFS |
612 | } |
613 | ||
cc3a86c8 | 614 | static void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 615 | { |
f547fac6 | 616 | struct __rt6_probe_work *work = NULL; |
5e670d84 | 617 | const struct in6_addr *nh_gw; |
1bef4c22 | 618 | unsigned long last_probe; |
f2c31e32 | 619 | struct neighbour *neigh; |
5e670d84 | 620 | struct net_device *dev; |
f547fac6 | 621 | struct inet6_dev *idev; |
5e670d84 | 622 | |
27097255 YH |
623 | /* |
624 | * Okay, this does not seem to be appropriate | |
625 | * for now, however, we need to check if it | |
626 | * is really so; aka Router Reachability Probing. | |
627 | * | |
628 | * Router Reachability Probe MUST be rate-limited | |
629 | * to no more than one per minute. | |
630 | */ | |
004b3942 | 631 | if (!fib6_nh->fib_nh_gw_family) |
7ff74a59 | 632 | return; |
5e670d84 | 633 | |
cc3a86c8 DA |
634 | nh_gw = &fib6_nh->fib_nh_gw6; |
635 | dev = fib6_nh->fib_nh_dev; | |
2152caea | 636 | rcu_read_lock_bh(); |
1bef4c22 | 637 | last_probe = READ_ONCE(fib6_nh->last_probe); |
f547fac6 | 638 | idev = __in6_dev_get(dev); |
5e670d84 | 639 | neigh = __ipv6_neigh_lookup_noref(dev, nh_gw); |
2152caea | 640 | if (neigh) { |
8d6c31bf MKL |
641 | if (neigh->nud_state & NUD_VALID) |
642 | goto out; | |
643 | ||
2152caea | 644 | write_lock(&neigh->lock); |
990edb42 MKL |
645 | if (!(neigh->nud_state & NUD_VALID) && |
646 | time_after(jiffies, | |
dcd1f572 | 647 | neigh->updated + idev->cnf.rtr_probe_interval)) { |
990edb42 MKL |
648 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
649 | if (work) | |
650 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 651 | } |
2152caea | 652 | write_unlock(&neigh->lock); |
1bef4c22 | 653 | } else if (time_after(jiffies, last_probe + |
f547fac6 | 654 | idev->cnf.rtr_probe_interval)) { |
990edb42 | 655 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
f2c31e32 | 656 | } |
990edb42 | 657 | |
1bef4c22 ED |
658 | if (!work || cmpxchg(&fib6_nh->last_probe, |
659 | last_probe, jiffies) != last_probe) { | |
660 | kfree(work); | |
661 | } else { | |
990edb42 | 662 | INIT_WORK(&work->work, rt6_probe_deferred); |
5e670d84 | 663 | work->target = *nh_gw; |
d62607c3 | 664 | netdev_hold(dev, &work->dev_tracker, GFP_ATOMIC); |
5e670d84 | 665 | work->dev = dev; |
990edb42 MKL |
666 | schedule_work(&work->work); |
667 | } | |
668 | ||
8d6c31bf | 669 | out: |
2152caea | 670 | rcu_read_unlock_bh(); |
27097255 YH |
671 | } |
672 | #else | |
cc3a86c8 | 673 | static inline void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 674 | { |
27097255 YH |
675 | } |
676 | #endif | |
677 | ||
1da177e4 | 678 | /* |
554cfb7e | 679 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 680 | */ |
1ba9a895 | 681 | static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh) |
1da177e4 | 682 | { |
afc154e9 | 683 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
5e670d84 | 684 | struct neighbour *neigh; |
f2c31e32 | 685 | |
145a3621 | 686 | rcu_read_lock_bh(); |
1ba9a895 DA |
687 | neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev, |
688 | &fib6_nh->fib_nh_gw6); | |
145a3621 YH |
689 | if (neigh) { |
690 | read_lock(&neigh->lock); | |
554cfb7e | 691 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 692 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 693 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 694 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 695 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
696 | else |
697 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 698 | #endif |
145a3621 | 699 | read_unlock(&neigh->lock); |
afc154e9 HFS |
700 | } else { |
701 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 702 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 703 | } |
145a3621 YH |
704 | rcu_read_unlock_bh(); |
705 | ||
a5a81f0b | 706 | return ret; |
1da177e4 LT |
707 | } |
708 | ||
702cea56 DA |
709 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
710 | int strict) | |
1da177e4 | 711 | { |
6e1809a5 DA |
712 | int m = 0; |
713 | ||
714 | if (!oif || nh->fib_nh_dev->ifindex == oif) | |
715 | m = 2; | |
1ab1457c | 716 | |
77d16f45 | 717 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 718 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 | 719 | #ifdef CONFIG_IPV6_ROUTER_PREF |
702cea56 | 720 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2; |
ebacaaa0 | 721 | #endif |
1ba9a895 | 722 | if ((strict & RT6_LOOKUP_F_REACHABLE) && |
702cea56 | 723 | !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) { |
1ba9a895 | 724 | int n = rt6_check_neigh(nh); |
afc154e9 HFS |
725 | if (n < 0) |
726 | return n; | |
727 | } | |
554cfb7e YH |
728 | return m; |
729 | } | |
730 | ||
28679ed1 DA |
731 | static bool find_match(struct fib6_nh *nh, u32 fib6_flags, |
732 | int oif, int strict, int *mpri, bool *do_rr) | |
554cfb7e | 733 | { |
afc154e9 | 734 | bool match_do_rr = false; |
28679ed1 DA |
735 | bool rc = false; |
736 | int m; | |
35103d11 | 737 | |
28679ed1 | 738 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
8067bb8c IS |
739 | goto out; |
740 | ||
28679ed1 DA |
741 | if (ip6_ignore_linkdown(nh->fib_nh_dev) && |
742 | nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
d5d32e4b | 743 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) |
35103d11 | 744 | goto out; |
f11e6659 | 745 | |
28679ed1 | 746 | m = rt6_score_route(nh, fib6_flags, oif, strict); |
7e980569 | 747 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
748 | match_do_rr = true; |
749 | m = 0; /* lowest valid score */ | |
7e980569 | 750 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 751 | goto out; |
afc154e9 HFS |
752 | } |
753 | ||
754 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
28679ed1 | 755 | rt6_probe(nh); |
f11e6659 | 756 | |
7e980569 | 757 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 758 | if (m > *mpri) { |
afc154e9 | 759 | *do_rr = match_do_rr; |
f11e6659 | 760 | *mpri = m; |
28679ed1 | 761 | rc = true; |
f11e6659 | 762 | } |
f11e6659 | 763 | out: |
28679ed1 | 764 | return rc; |
f11e6659 DM |
765 | } |
766 | ||
17a5984e DA |
767 | struct fib6_nh_frl_arg { |
768 | u32 flags; | |
769 | int oif; | |
770 | int strict; | |
771 | int *mpri; | |
772 | bool *do_rr; | |
773 | struct fib6_nh *nh; | |
774 | }; | |
775 | ||
776 | static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
777 | { | |
778 | struct fib6_nh_frl_arg *arg = _arg; | |
779 | ||
780 | arg->nh = nh; | |
781 | return find_match(nh, arg->flags, arg->oif, arg->strict, | |
782 | arg->mpri, arg->do_rr); | |
783 | } | |
784 | ||
b7bc4b6a | 785 | static void __find_rr_leaf(struct fib6_info *f6i_start, |
30c15f03 | 786 | struct fib6_info *nomatch, u32 metric, |
b7bc4b6a | 787 | struct fib6_result *res, struct fib6_info **cont, |
30c15f03 | 788 | int oif, int strict, bool *do_rr, int *mpri) |
f11e6659 | 789 | { |
b7bc4b6a | 790 | struct fib6_info *f6i; |
1da177e4 | 791 | |
b7bc4b6a DA |
792 | for (f6i = f6i_start; |
793 | f6i && f6i != nomatch; | |
794 | f6i = rcu_dereference(f6i->fib6_next)) { | |
17a5984e | 795 | bool matched = false; |
30c15f03 DA |
796 | struct fib6_nh *nh; |
797 | ||
b7bc4b6a DA |
798 | if (cont && f6i->fib6_metric != metric) { |
799 | *cont = f6i; | |
30c15f03 | 800 | return; |
9fbdcfaf SK |
801 | } |
802 | ||
b7bc4b6a | 803 | if (fib6_check_expired(f6i)) |
28679ed1 DA |
804 | continue; |
805 | ||
17a5984e DA |
806 | if (unlikely(f6i->nh)) { |
807 | struct fib6_nh_frl_arg arg = { | |
808 | .flags = f6i->fib6_flags, | |
809 | .oif = oif, | |
810 | .strict = strict, | |
811 | .mpri = mpri, | |
812 | .do_rr = do_rr | |
813 | }; | |
814 | ||
815 | if (nexthop_is_blackhole(f6i->nh)) { | |
816 | res->fib6_flags = RTF_REJECT; | |
817 | res->fib6_type = RTN_BLACKHOLE; | |
818 | res->f6i = f6i; | |
819 | res->nh = nexthop_fib6_nh(f6i->nh); | |
820 | return; | |
821 | } | |
822 | if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match, | |
823 | &arg)) { | |
824 | matched = true; | |
825 | nh = arg.nh; | |
826 | } | |
827 | } else { | |
828 | nh = f6i->fib6_nh; | |
829 | if (find_match(nh, f6i->fib6_flags, oif, strict, | |
830 | mpri, do_rr)) | |
831 | matched = true; | |
832 | } | |
833 | if (matched) { | |
b7bc4b6a DA |
834 | res->f6i = f6i; |
835 | res->nh = nh; | |
7d21fec9 DA |
836 | res->fib6_flags = f6i->fib6_flags; |
837 | res->fib6_type = f6i->fib6_type; | |
b7bc4b6a | 838 | } |
9fbdcfaf | 839 | } |
30c15f03 | 840 | } |
9fbdcfaf | 841 | |
b7bc4b6a DA |
842 | static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf, |
843 | struct fib6_info *rr_head, int oif, int strict, | |
844 | bool *do_rr, struct fib6_result *res) | |
30c15f03 | 845 | { |
b7bc4b6a DA |
846 | u32 metric = rr_head->fib6_metric; |
847 | struct fib6_info *cont = NULL; | |
30c15f03 | 848 | int mpri = -1; |
9fbdcfaf | 849 | |
b7bc4b6a | 850 | __find_rr_leaf(rr_head, NULL, metric, res, &cont, |
30c15f03 | 851 | oif, strict, do_rr, &mpri); |
28679ed1 | 852 | |
b7bc4b6a | 853 | __find_rr_leaf(leaf, rr_head, metric, res, &cont, |
30c15f03 | 854 | oif, strict, do_rr, &mpri); |
9fbdcfaf | 855 | |
b7bc4b6a DA |
856 | if (res->f6i || !cont) |
857 | return; | |
9fbdcfaf | 858 | |
b7bc4b6a | 859 | __find_rr_leaf(cont, NULL, metric, res, NULL, |
30c15f03 | 860 | oif, strict, do_rr, &mpri); |
f11e6659 | 861 | } |
1da177e4 | 862 | |
b7bc4b6a DA |
863 | static void rt6_select(struct net *net, struct fib6_node *fn, int oif, |
864 | struct fib6_result *res, int strict) | |
f11e6659 | 865 | { |
8d1c802b | 866 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
b7bc4b6a | 867 | struct fib6_info *rt0; |
afc154e9 | 868 | bool do_rr = false; |
17ecf590 | 869 | int key_plen; |
1da177e4 | 870 | |
b7bc4b6a DA |
871 | /* make sure this function or its helpers sets f6i */ |
872 | res->f6i = NULL; | |
873 | ||
421842ed | 874 | if (!leaf || leaf == net->ipv6.fib6_null_entry) |
b7bc4b6a | 875 | goto out; |
8d1040e8 | 876 | |
66f5d6ce | 877 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 878 | if (!rt0) |
66f5d6ce | 879 | rt0 = leaf; |
1da177e4 | 880 | |
17ecf590 WW |
881 | /* Double check to make sure fn is not an intermediate node |
882 | * and fn->leaf does not points to its child's leaf | |
883 | * (This might happen if all routes under fn are deleted from | |
884 | * the tree and fib6_repair_tree() is called on the node.) | |
885 | */ | |
93c2fb25 | 886 | key_plen = rt0->fib6_dst.plen; |
17ecf590 | 887 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
888 | if (rt0->fib6_src.plen) |
889 | key_plen = rt0->fib6_src.plen; | |
17ecf590 WW |
890 | #endif |
891 | if (fn->fn_bit != key_plen) | |
b7bc4b6a | 892 | goto out; |
1da177e4 | 893 | |
b7bc4b6a | 894 | find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res); |
afc154e9 | 895 | if (do_rr) { |
8fb11a9a | 896 | struct fib6_info *next = rcu_dereference(rt0->fib6_next); |
f11e6659 | 897 | |
554cfb7e | 898 | /* no entries matched; do round-robin */ |
93c2fb25 | 899 | if (!next || next->fib6_metric != rt0->fib6_metric) |
8d1040e8 | 900 | next = leaf; |
f11e6659 | 901 | |
66f5d6ce | 902 | if (next != rt0) { |
93c2fb25 | 903 | spin_lock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 904 | /* make sure next is not being deleted from the tree */ |
93c2fb25 | 905 | if (next->fib6_node) |
66f5d6ce | 906 | rcu_assign_pointer(fn->rr_ptr, next); |
93c2fb25 | 907 | spin_unlock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 908 | } |
1da177e4 | 909 | } |
1da177e4 | 910 | |
b7bc4b6a DA |
911 | out: |
912 | if (!res->f6i) { | |
913 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 914 | res->nh = res->f6i->fib6_nh; |
7d21fec9 DA |
915 | res->fib6_flags = res->f6i->fib6_flags; |
916 | res->fib6_type = res->f6i->fib6_type; | |
b7bc4b6a | 917 | } |
1da177e4 LT |
918 | } |
919 | ||
85bd05de | 920 | static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res) |
8b9df265 | 921 | { |
85bd05de DA |
922 | return (res->f6i->fib6_flags & RTF_NONEXTHOP) || |
923 | res->nh->fib_nh_gw_family; | |
8b9df265 MKL |
924 | } |
925 | ||
70ceb4f5 YH |
926 | #ifdef CONFIG_IPV6_ROUTE_INFO |
927 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 928 | const struct in6_addr *gwaddr) |
70ceb4f5 | 929 | { |
c346dca1 | 930 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
931 | struct route_info *rinfo = (struct route_info *) opt; |
932 | struct in6_addr prefix_buf, *prefix; | |
933 | unsigned int pref; | |
4bed72e4 | 934 | unsigned long lifetime; |
8d1c802b | 935 | struct fib6_info *rt; |
70ceb4f5 YH |
936 | |
937 | if (len < sizeof(struct route_info)) { | |
938 | return -EINVAL; | |
939 | } | |
940 | ||
941 | /* Sanity check for prefix_len and length */ | |
942 | if (rinfo->length > 3) { | |
943 | return -EINVAL; | |
944 | } else if (rinfo->prefix_len > 128) { | |
945 | return -EINVAL; | |
946 | } else if (rinfo->prefix_len > 64) { | |
947 | if (rinfo->length < 2) { | |
948 | return -EINVAL; | |
949 | } | |
950 | } else if (rinfo->prefix_len > 0) { | |
951 | if (rinfo->length < 1) { | |
952 | return -EINVAL; | |
953 | } | |
954 | } | |
955 | ||
956 | pref = rinfo->route_pref; | |
957 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 958 | return -EINVAL; |
70ceb4f5 | 959 | |
4bed72e4 | 960 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
961 | |
962 | if (rinfo->length == 3) | |
963 | prefix = (struct in6_addr *)rinfo->prefix; | |
964 | else { | |
965 | /* this function is safe */ | |
966 | ipv6_addr_prefix(&prefix_buf, | |
967 | (struct in6_addr *)rinfo->prefix, | |
968 | rinfo->prefix_len); | |
969 | prefix = &prefix_buf; | |
970 | } | |
971 | ||
f104a567 | 972 | if (rinfo->prefix_len == 0) |
afb1d4b5 | 973 | rt = rt6_get_dflt_router(net, gwaddr, dev); |
f104a567 DJ |
974 | else |
975 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 976 | gwaddr, dev); |
70ceb4f5 YH |
977 | |
978 | if (rt && !lifetime) { | |
11dd74b3 | 979 | ip6_del_rt(net, rt, false); |
70ceb4f5 YH |
980 | rt = NULL; |
981 | } | |
982 | ||
983 | if (!rt && lifetime) | |
830218c1 DA |
984 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
985 | dev, pref); | |
70ceb4f5 | 986 | else if (rt) |
93c2fb25 DA |
987 | rt->fib6_flags = RTF_ROUTEINFO | |
988 | (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
70ceb4f5 YH |
989 | |
990 | if (rt) { | |
1716a961 | 991 | if (!addrconf_finite_timeout(lifetime)) |
14895687 | 992 | fib6_clean_expires(rt); |
1716a961 | 993 | else |
14895687 | 994 | fib6_set_expires(rt, jiffies + HZ * lifetime); |
1716a961 | 995 | |
93531c67 | 996 | fib6_info_release(rt); |
70ceb4f5 YH |
997 | } |
998 | return 0; | |
999 | } | |
1000 | #endif | |
1001 | ||
ae90d867 DA |
1002 | /* |
1003 | * Misc support functions | |
1004 | */ | |
1005 | ||
1006 | /* called with rcu_lock held */ | |
0d161581 | 1007 | static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res) |
ae90d867 | 1008 | { |
0d161581 | 1009 | struct net_device *dev = res->nh->fib_nh_dev; |
ae90d867 | 1010 | |
7d21fec9 | 1011 | if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
ae90d867 DA |
1012 | /* for copies of local routes, dst->dev needs to be the |
1013 | * device if it is a master device, the master device if | |
1014 | * device is enslaved, and the loopback as the default | |
1015 | */ | |
1016 | if (netif_is_l3_slave(dev) && | |
7d21fec9 | 1017 | !rt6_need_strict(&res->f6i->fib6_dst.addr)) |
ae90d867 DA |
1018 | dev = l3mdev_master_dev_rcu(dev); |
1019 | else if (!netif_is_l3_master(dev)) | |
1020 | dev = dev_net(dev)->loopback_dev; | |
1021 | /* last case is netif_is_l3_master(dev) is true in which | |
1022 | * case we want dev returned to be dev | |
1023 | */ | |
1024 | } | |
1025 | ||
1026 | return dev; | |
1027 | } | |
1028 | ||
6edb3c96 DA |
1029 | static const int fib6_prop[RTN_MAX + 1] = { |
1030 | [RTN_UNSPEC] = 0, | |
1031 | [RTN_UNICAST] = 0, | |
1032 | [RTN_LOCAL] = 0, | |
1033 | [RTN_BROADCAST] = 0, | |
1034 | [RTN_ANYCAST] = 0, | |
1035 | [RTN_MULTICAST] = 0, | |
1036 | [RTN_BLACKHOLE] = -EINVAL, | |
1037 | [RTN_UNREACHABLE] = -EHOSTUNREACH, | |
1038 | [RTN_PROHIBIT] = -EACCES, | |
1039 | [RTN_THROW] = -EAGAIN, | |
1040 | [RTN_NAT] = -EINVAL, | |
1041 | [RTN_XRESOLVE] = -EINVAL, | |
1042 | }; | |
1043 | ||
1044 | static int ip6_rt_type_to_error(u8 fib6_type) | |
1045 | { | |
1046 | return fib6_prop[fib6_type]; | |
1047 | } | |
1048 | ||
8d1c802b | 1049 | static unsigned short fib6_info_dst_flags(struct fib6_info *rt) |
3b6761d1 DA |
1050 | { |
1051 | unsigned short flags = 0; | |
1052 | ||
1053 | if (rt->dst_nocount) | |
1054 | flags |= DST_NOCOUNT; | |
1055 | if (rt->dst_nopolicy) | |
1056 | flags |= DST_NOPOLICY; | |
3b6761d1 DA |
1057 | |
1058 | return flags; | |
1059 | } | |
1060 | ||
7d21fec9 | 1061 | static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) |
6edb3c96 | 1062 | { |
7d21fec9 | 1063 | rt->dst.error = ip6_rt_type_to_error(fib6_type); |
6edb3c96 | 1064 | |
7d21fec9 | 1065 | switch (fib6_type) { |
6edb3c96 DA |
1066 | case RTN_BLACKHOLE: |
1067 | rt->dst.output = dst_discard_out; | |
1068 | rt->dst.input = dst_discard; | |
1069 | break; | |
1070 | case RTN_PROHIBIT: | |
1071 | rt->dst.output = ip6_pkt_prohibit_out; | |
1072 | rt->dst.input = ip6_pkt_prohibit; | |
1073 | break; | |
1074 | case RTN_THROW: | |
1075 | case RTN_UNREACHABLE: | |
1076 | default: | |
1077 | rt->dst.output = ip6_pkt_discard_out; | |
1078 | rt->dst.input = ip6_pkt_discard; | |
1079 | break; | |
1080 | } | |
1081 | } | |
1082 | ||
0d161581 | 1083 | static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res) |
6edb3c96 | 1084 | { |
7d21fec9 | 1085 | struct fib6_info *f6i = res->f6i; |
0d161581 | 1086 | |
7d21fec9 DA |
1087 | if (res->fib6_flags & RTF_REJECT) { |
1088 | ip6_rt_init_dst_reject(rt, res->fib6_type); | |
6edb3c96 DA |
1089 | return; |
1090 | } | |
1091 | ||
1092 | rt->dst.error = 0; | |
1093 | rt->dst.output = ip6_output; | |
1094 | ||
7d21fec9 | 1095 | if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) { |
6edb3c96 | 1096 | rt->dst.input = ip6_input; |
7d21fec9 | 1097 | } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) { |
6edb3c96 DA |
1098 | rt->dst.input = ip6_mc_input; |
1099 | } else { | |
1100 | rt->dst.input = ip6_forward; | |
1101 | } | |
1102 | ||
0d161581 DA |
1103 | if (res->nh->fib_nh_lws) { |
1104 | rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws); | |
6edb3c96 DA |
1105 | lwtunnel_set_redirect(&rt->dst); |
1106 | } | |
1107 | ||
1108 | rt->dst.lastuse = jiffies; | |
1109 | } | |
1110 | ||
e873e4b9 | 1111 | /* Caller must already hold reference to @from */ |
8d1c802b | 1112 | static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) |
ae90d867 | 1113 | { |
ae90d867 | 1114 | rt->rt6i_flags &= ~RTF_EXPIRES; |
a68886a6 | 1115 | rcu_assign_pointer(rt->from, from); |
e1255ed4 | 1116 | ip_dst_init_metrics(&rt->dst, from->fib6_metrics); |
ae90d867 DA |
1117 | } |
1118 | ||
0d161581 DA |
1119 | /* Caller must already hold reference to f6i in result */ |
1120 | static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res) | |
ae90d867 | 1121 | { |
0d161581 DA |
1122 | const struct fib6_nh *nh = res->nh; |
1123 | const struct net_device *dev = nh->fib_nh_dev; | |
1124 | struct fib6_info *f6i = res->f6i; | |
dcd1f572 | 1125 | |
0d161581 | 1126 | ip6_rt_init_dst(rt, res); |
6edb3c96 | 1127 | |
0d161581 | 1128 | rt->rt6i_dst = f6i->fib6_dst; |
dcd1f572 | 1129 | rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; |
7d21fec9 | 1130 | rt->rt6i_flags = res->fib6_flags; |
0d161581 DA |
1131 | if (nh->fib_nh_gw_family) { |
1132 | rt->rt6i_gateway = nh->fib_nh_gw6; | |
2b2450ca DA |
1133 | rt->rt6i_flags |= RTF_GATEWAY; |
1134 | } | |
0d161581 | 1135 | rt6_set_from(rt, f6i); |
ae90d867 | 1136 | #ifdef CONFIG_IPV6_SUBTREES |
0d161581 | 1137 | rt->rt6i_src = f6i->fib6_src; |
ae90d867 | 1138 | #endif |
ae90d867 DA |
1139 | } |
1140 | ||
a3c00e46 MKL |
1141 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
1142 | struct in6_addr *saddr) | |
1143 | { | |
66f5d6ce | 1144 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
1145 | while (1) { |
1146 | if (fn->fn_flags & RTN_TL_ROOT) | |
1147 | return NULL; | |
66f5d6ce WW |
1148 | pn = rcu_dereference(fn->parent); |
1149 | sn = FIB6_SUBTREE(pn); | |
1150 | if (sn && sn != fn) | |
6454743b | 1151 | fn = fib6_node_lookup(sn, NULL, saddr); |
a3c00e46 MKL |
1152 | else |
1153 | fn = pn; | |
1154 | if (fn->fn_flags & RTN_RTINFO) | |
1155 | return fn; | |
1156 | } | |
1157 | } | |
c71099ac | 1158 | |
10585b43 | 1159 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt) |
d3843fe5 WW |
1160 | { |
1161 | struct rt6_info *rt = *prt; | |
1162 | ||
1163 | if (dst_hold_safe(&rt->dst)) | |
1164 | return true; | |
10585b43 | 1165 | if (net) { |
d3843fe5 WW |
1166 | rt = net->ipv6.ip6_null_entry; |
1167 | dst_hold(&rt->dst); | |
1168 | } else { | |
1169 | rt = NULL; | |
1170 | } | |
1171 | *prt = rt; | |
1172 | return false; | |
1173 | } | |
1174 | ||
dec9b0e2 | 1175 | /* called with rcu_lock held */ |
9b6b35ab | 1176 | static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res) |
dec9b0e2 | 1177 | { |
9b6b35ab DA |
1178 | struct net_device *dev = res->nh->fib_nh_dev; |
1179 | struct fib6_info *f6i = res->f6i; | |
1180 | unsigned short flags; | |
dec9b0e2 DA |
1181 | struct rt6_info *nrt; |
1182 | ||
9b6b35ab | 1183 | if (!fib6_info_hold_safe(f6i)) |
1c87e79a | 1184 | goto fallback; |
e873e4b9 | 1185 | |
9b6b35ab | 1186 | flags = fib6_info_dst_flags(f6i); |
93531c67 | 1187 | nrt = ip6_dst_alloc(dev_net(dev), dev, flags); |
1c87e79a | 1188 | if (!nrt) { |
9b6b35ab | 1189 | fib6_info_release(f6i); |
1c87e79a XL |
1190 | goto fallback; |
1191 | } | |
dec9b0e2 | 1192 | |
0d161581 | 1193 | ip6_rt_copy_init(nrt, res); |
1c87e79a XL |
1194 | return nrt; |
1195 | ||
1196 | fallback: | |
1197 | nrt = dev_net(dev)->ipv6.ip6_null_entry; | |
1198 | dst_hold(&nrt->dst); | |
dec9b0e2 DA |
1199 | return nrt; |
1200 | } | |
1201 | ||
55cced4f | 1202 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net, |
8ed67789 | 1203 | struct fib6_table *table, |
b75cc8f9 DA |
1204 | struct flowi6 *fl6, |
1205 | const struct sk_buff *skb, | |
1206 | int flags) | |
1da177e4 | 1207 | { |
b1d40991 | 1208 | struct fib6_result res = {}; |
1da177e4 | 1209 | struct fib6_node *fn; |
23fb93a4 | 1210 | struct rt6_info *rt; |
1da177e4 | 1211 | |
66f5d6ce | 1212 | rcu_read_lock(); |
6454743b | 1213 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 1214 | restart: |
b1d40991 DA |
1215 | res.f6i = rcu_dereference(fn->leaf); |
1216 | if (!res.f6i) | |
1217 | res.f6i = net->ipv6.fib6_null_entry; | |
af52a52c | 1218 | else |
75ef7389 DA |
1219 | rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif, |
1220 | flags); | |
af52a52c | 1221 | |
b1d40991 | 1222 | if (res.f6i == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
1223 | fn = fib6_backtrack(fn, &fl6->saddr); |
1224 | if (fn) | |
1225 | goto restart; | |
2b760fcf | 1226 | |
af52a52c DA |
1227 | rt = net->ipv6.ip6_null_entry; |
1228 | dst_hold(&rt->dst); | |
1229 | goto out; | |
f88d8ea6 DA |
1230 | } else if (res.fib6_flags & RTF_REJECT) { |
1231 | goto do_create; | |
af52a52c | 1232 | } |
d3843fe5 | 1233 | |
b1d40991 DA |
1234 | fib6_select_path(net, &res, fl6, fl6->flowi6_oif, |
1235 | fl6->flowi6_oif != 0, skb, flags); | |
1236 | ||
2b760fcf | 1237 | /* Search through exception table */ |
7e4b5128 | 1238 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 1239 | if (rt) { |
10585b43 | 1240 | if (ip6_hold_safe(net, &rt)) |
dec9b0e2 | 1241 | dst_use_noref(&rt->dst, jiffies); |
23fb93a4 | 1242 | } else { |
f88d8ea6 | 1243 | do_create: |
9b6b35ab | 1244 | rt = ip6_create_rt_rcu(&res); |
dec9b0e2 | 1245 | } |
b811580d | 1246 | |
af52a52c | 1247 | out: |
8ff2e5b2 | 1248 | trace_fib6_table_lookup(net, &res, table, fl6); |
af52a52c | 1249 | |
66f5d6ce | 1250 | rcu_read_unlock(); |
b811580d | 1251 | |
c71099ac | 1252 | return rt; |
c71099ac TG |
1253 | } |
1254 | ||
67ba4152 | 1255 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 1256 | const struct sk_buff *skb, int flags) |
ea6e574e | 1257 | { |
b75cc8f9 | 1258 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup); |
ea6e574e FW |
1259 | } |
1260 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
1261 | ||
9acd9f3a | 1262 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
1263 | const struct in6_addr *saddr, int oif, |
1264 | const struct sk_buff *skb, int strict) | |
c71099ac | 1265 | { |
4c9483b2 DM |
1266 | struct flowi6 fl6 = { |
1267 | .flowi6_oif = oif, | |
1268 | .daddr = *daddr, | |
c71099ac TG |
1269 | }; |
1270 | struct dst_entry *dst; | |
77d16f45 | 1271 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 1272 | |
adaa70bb | 1273 | if (saddr) { |
4c9483b2 | 1274 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
1275 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1276 | } | |
1277 | ||
b75cc8f9 | 1278 | dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup); |
c71099ac TG |
1279 | if (dst->error == 0) |
1280 | return (struct rt6_info *) dst; | |
1281 | ||
1282 | dst_release(dst); | |
1283 | ||
1da177e4 LT |
1284 | return NULL; |
1285 | } | |
7159039a YH |
1286 | EXPORT_SYMBOL(rt6_lookup); |
1287 | ||
c71099ac | 1288 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
1289 | * It takes new route entry, the addition fails by any reason the |
1290 | * route is released. | |
1291 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1292 | */ |
1293 | ||
8d1c802b | 1294 | static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info, |
333c4301 | 1295 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1296 | { |
1297 | int err; | |
c71099ac | 1298 | struct fib6_table *table; |
1da177e4 | 1299 | |
93c2fb25 | 1300 | table = rt->fib6_table; |
66f5d6ce | 1301 | spin_lock_bh(&table->tb6_lock); |
d4ead6b3 | 1302 | err = fib6_add(&table->tb6_root, rt, info, extack); |
66f5d6ce | 1303 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1304 | |
1305 | return err; | |
1306 | } | |
1307 | ||
8d1c802b | 1308 | int ip6_ins_rt(struct net *net, struct fib6_info *rt) |
40e22e8f | 1309 | { |
afb1d4b5 | 1310 | struct nl_info info = { .nl_net = net, }; |
e715b6d3 | 1311 | |
d4ead6b3 | 1312 | return __ip6_ins_rt(rt, &info, NULL); |
40e22e8f TG |
1313 | } |
1314 | ||
85bd05de | 1315 | static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, |
8b9df265 MKL |
1316 | const struct in6_addr *daddr, |
1317 | const struct in6_addr *saddr) | |
1da177e4 | 1318 | { |
85bd05de | 1319 | struct fib6_info *f6i = res->f6i; |
4832c30d | 1320 | struct net_device *dev; |
1da177e4 LT |
1321 | struct rt6_info *rt; |
1322 | ||
1323 | /* | |
1324 | * Clone the route. | |
1325 | */ | |
1326 | ||
85bd05de | 1327 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1328 | return NULL; |
1329 | ||
0d161581 | 1330 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1331 | rt = ip6_dst_alloc(dev_net(dev), dev, 0); |
e873e4b9 | 1332 | if (!rt) { |
85bd05de | 1333 | fib6_info_release(f6i); |
83a09abd | 1334 | return NULL; |
e873e4b9 | 1335 | } |
83a09abd | 1336 | |
0d161581 | 1337 | ip6_rt_copy_init(rt, res); |
83a09abd | 1338 | rt->rt6i_flags |= RTF_CACHE; |
83a09abd MKL |
1339 | rt->rt6i_dst.addr = *daddr; |
1340 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1341 | |
85bd05de DA |
1342 | if (!rt6_is_gw_or_nonexthop(res)) { |
1343 | if (f6i->fib6_dst.plen != 128 && | |
1344 | ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) | |
83a09abd | 1345 | rt->rt6i_flags |= RTF_ANYCAST; |
1da177e4 | 1346 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1347 | if (rt->rt6i_src.plen && saddr) { |
1348 | rt->rt6i_src.addr = *saddr; | |
1349 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1350 | } |
83a09abd | 1351 | #endif |
95a9a5ba | 1352 | } |
1da177e4 | 1353 | |
95a9a5ba YH |
1354 | return rt; |
1355 | } | |
1da177e4 | 1356 | |
db3fedee | 1357 | static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res) |
d52d3997 | 1358 | { |
db3fedee DA |
1359 | struct fib6_info *f6i = res->f6i; |
1360 | unsigned short flags = fib6_info_dst_flags(f6i); | |
4832c30d | 1361 | struct net_device *dev; |
d52d3997 MKL |
1362 | struct rt6_info *pcpu_rt; |
1363 | ||
db3fedee | 1364 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1365 | return NULL; |
1366 | ||
4832c30d | 1367 | rcu_read_lock(); |
0d161581 | 1368 | dev = ip6_rt_get_dev_rcu(res); |
d8882935 | 1369 | pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT); |
4832c30d | 1370 | rcu_read_unlock(); |
e873e4b9 | 1371 | if (!pcpu_rt) { |
db3fedee | 1372 | fib6_info_release(f6i); |
d52d3997 | 1373 | return NULL; |
e873e4b9 | 1374 | } |
0d161581 | 1375 | ip6_rt_copy_init(pcpu_rt, res); |
d52d3997 | 1376 | pcpu_rt->rt6i_flags |= RTF_PCPU; |
8f34e53b DA |
1377 | |
1378 | if (f6i->nh) | |
1379 | pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev)); | |
1380 | ||
d52d3997 MKL |
1381 | return pcpu_rt; |
1382 | } | |
1383 | ||
8f34e53b DA |
1384 | static bool rt6_is_valid(const struct rt6_info *rt6) |
1385 | { | |
1386 | return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev)); | |
1387 | } | |
1388 | ||
66f5d6ce | 1389 | /* It should be called with rcu_read_lock() acquired */ |
db3fedee | 1390 | static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res) |
d52d3997 | 1391 | { |
c353071a | 1392 | struct rt6_info *pcpu_rt; |
d52d3997 | 1393 | |
c353071a | 1394 | pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu); |
d52d3997 | 1395 | |
8f34e53b DA |
1396 | if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) { |
1397 | struct rt6_info *prev, **p; | |
1398 | ||
1399 | p = this_cpu_ptr(res->nh->rt6i_pcpu); | |
1400 | prev = xchg(p, NULL); | |
1401 | if (prev) { | |
1402 | dst_dev_put(&prev->dst); | |
1403 | dst_release(&prev->dst); | |
1404 | } | |
1405 | ||
1406 | pcpu_rt = NULL; | |
1407 | } | |
1408 | ||
a73e4195 MKL |
1409 | return pcpu_rt; |
1410 | } | |
1411 | ||
afb1d4b5 | 1412 | static struct rt6_info *rt6_make_pcpu_route(struct net *net, |
db3fedee | 1413 | const struct fib6_result *res) |
a73e4195 MKL |
1414 | { |
1415 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 | 1416 | |
db3fedee | 1417 | pcpu_rt = ip6_rt_pcpu_alloc(res); |
0e09edcc WW |
1418 | if (!pcpu_rt) |
1419 | return NULL; | |
d52d3997 | 1420 | |
f40b6ae2 | 1421 | p = this_cpu_ptr(res->nh->rt6i_pcpu); |
a94b9367 | 1422 | prev = cmpxchg(p, NULL, pcpu_rt); |
951f788a | 1423 | BUG_ON(prev); |
a94b9367 | 1424 | |
61fb0d01 ED |
1425 | if (res->f6i->fib6_destroying) { |
1426 | struct fib6_info *from; | |
1427 | ||
1428 | from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); | |
1429 | fib6_info_release(from); | |
1430 | } | |
1431 | ||
d52d3997 MKL |
1432 | return pcpu_rt; |
1433 | } | |
1434 | ||
35732d01 WW |
1435 | /* exception hash table implementation |
1436 | */ | |
1437 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1438 | ||
1439 | /* Remove rt6_ex from hash table and free the memory | |
1440 | * Caller must hold rt6_exception_lock | |
1441 | */ | |
1442 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1443 | struct rt6_exception *rt6_ex) | |
1444 | { | |
f5b51fe8 | 1445 | struct fib6_info *from; |
b2427e67 | 1446 | struct net *net; |
81eb8447 | 1447 | |
35732d01 WW |
1448 | if (!bucket || !rt6_ex) |
1449 | return; | |
b2427e67 CIK |
1450 | |
1451 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
f5b51fe8 PA |
1452 | net->ipv6.rt6_stats->fib_rt_cache--; |
1453 | ||
1454 | /* purge completely the exception to allow releasing the held resources: | |
1455 | * some [sk] cache may keep the dst around for unlimited time | |
1456 | */ | |
0e233874 | 1457 | from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL); |
f5b51fe8 PA |
1458 | fib6_info_release(from); |
1459 | dst_dev_put(&rt6_ex->rt6i->dst); | |
1460 | ||
35732d01 | 1461 | hlist_del_rcu(&rt6_ex->hlist); |
77634cc6 | 1462 | dst_release(&rt6_ex->rt6i->dst); |
35732d01 WW |
1463 | kfree_rcu(rt6_ex, rcu); |
1464 | WARN_ON_ONCE(!bucket->depth); | |
1465 | bucket->depth--; | |
1466 | } | |
1467 | ||
1468 | /* Remove oldest rt6_ex in bucket and free the memory | |
1469 | * Caller must hold rt6_exception_lock | |
1470 | */ | |
1471 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1472 | { | |
1473 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1474 | ||
1475 | if (!bucket) | |
1476 | return; | |
1477 | ||
1478 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1479 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1480 | oldest = rt6_ex; | |
1481 | } | |
1482 | rt6_remove_exception(bucket, oldest); | |
1483 | } | |
1484 | ||
1485 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1486 | const struct in6_addr *src) | |
1487 | { | |
49ecc2e9 | 1488 | static siphash_aligned_key_t rt6_exception_key; |
4785305c ED |
1489 | struct { |
1490 | struct in6_addr dst; | |
1491 | struct in6_addr src; | |
1492 | } __aligned(SIPHASH_ALIGNMENT) combined = { | |
1493 | .dst = *dst, | |
1494 | }; | |
1495 | u64 val; | |
35732d01 | 1496 | |
4785305c | 1497 | net_get_random_once(&rt6_exception_key, sizeof(rt6_exception_key)); |
35732d01 WW |
1498 | |
1499 | #ifdef CONFIG_IPV6_SUBTREES | |
1500 | if (src) | |
4785305c | 1501 | combined.src = *src; |
35732d01 | 1502 | #endif |
4785305c ED |
1503 | val = siphash(&combined, sizeof(combined), &rt6_exception_key); |
1504 | ||
1505 | return hash_64(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
35732d01 WW |
1506 | } |
1507 | ||
1508 | /* Helper function to find the cached rt in the hash table | |
1509 | * and update bucket pointer to point to the bucket for this | |
1510 | * (daddr, saddr) pair | |
1511 | * Caller must hold rt6_exception_lock | |
1512 | */ | |
1513 | static struct rt6_exception * | |
1514 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1515 | const struct in6_addr *daddr, | |
1516 | const struct in6_addr *saddr) | |
1517 | { | |
1518 | struct rt6_exception *rt6_ex; | |
1519 | u32 hval; | |
1520 | ||
1521 | if (!(*bucket) || !daddr) | |
1522 | return NULL; | |
1523 | ||
1524 | hval = rt6_exception_hash(daddr, saddr); | |
1525 | *bucket += hval; | |
1526 | ||
1527 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1528 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1529 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1530 | ||
1531 | #ifdef CONFIG_IPV6_SUBTREES | |
1532 | if (matched && saddr) | |
1533 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1534 | #endif | |
1535 | if (matched) | |
1536 | return rt6_ex; | |
1537 | } | |
1538 | return NULL; | |
1539 | } | |
1540 | ||
1541 | /* Helper function to find the cached rt in the hash table | |
1542 | * and update bucket pointer to point to the bucket for this | |
1543 | * (daddr, saddr) pair | |
1544 | * Caller must hold rcu_read_lock() | |
1545 | */ | |
1546 | static struct rt6_exception * | |
1547 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1548 | const struct in6_addr *daddr, | |
1549 | const struct in6_addr *saddr) | |
1550 | { | |
1551 | struct rt6_exception *rt6_ex; | |
1552 | u32 hval; | |
1553 | ||
1554 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1555 | ||
1556 | if (!(*bucket) || !daddr) | |
1557 | return NULL; | |
1558 | ||
1559 | hval = rt6_exception_hash(daddr, saddr); | |
1560 | *bucket += hval; | |
1561 | ||
1562 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1563 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1564 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1565 | ||
1566 | #ifdef CONFIG_IPV6_SUBTREES | |
1567 | if (matched && saddr) | |
1568 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1569 | #endif | |
1570 | if (matched) | |
1571 | return rt6_ex; | |
1572 | } | |
1573 | return NULL; | |
1574 | } | |
1575 | ||
b748f260 | 1576 | static unsigned int fib6_mtu(const struct fib6_result *res) |
d4ead6b3 | 1577 | { |
b748f260 | 1578 | const struct fib6_nh *nh = res->nh; |
d4ead6b3 DA |
1579 | unsigned int mtu; |
1580 | ||
b748f260 DA |
1581 | if (res->f6i->fib6_pmtu) { |
1582 | mtu = res->f6i->fib6_pmtu; | |
dcd1f572 | 1583 | } else { |
b748f260 | 1584 | struct net_device *dev = nh->fib_nh_dev; |
dcd1f572 DA |
1585 | struct inet6_dev *idev; |
1586 | ||
1587 | rcu_read_lock(); | |
1588 | idev = __in6_dev_get(dev); | |
1589 | mtu = idev->cnf.mtu6; | |
1590 | rcu_read_unlock(); | |
1591 | } | |
1592 | ||
d4ead6b3 DA |
1593 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1594 | ||
b748f260 | 1595 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
d4ead6b3 DA |
1596 | } |
1597 | ||
cc5c073a DA |
1598 | #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL |
1599 | ||
1600 | /* used when the flushed bit is not relevant, only access to the bucket | |
1601 | * (ie., all bucket users except rt6_insert_exception); | |
1602 | * | |
1603 | * called under rcu lock; sometimes called with rt6_exception_lock held | |
1604 | */ | |
1605 | static | |
1606 | struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh, | |
1607 | spinlock_t *lock) | |
1608 | { | |
1609 | struct rt6_exception_bucket *bucket; | |
1610 | ||
1611 | if (lock) | |
1612 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1613 | lockdep_is_held(lock)); | |
1614 | else | |
1615 | bucket = rcu_dereference(nh->rt6i_exception_bucket); | |
1616 | ||
1617 | /* remove bucket flushed bit if set */ | |
1618 | if (bucket) { | |
1619 | unsigned long p = (unsigned long)bucket; | |
1620 | ||
1621 | p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1622 | bucket = (struct rt6_exception_bucket *)p; | |
1623 | } | |
1624 | ||
1625 | return bucket; | |
1626 | } | |
1627 | ||
1628 | static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket) | |
1629 | { | |
1630 | unsigned long p = (unsigned long)bucket; | |
1631 | ||
1632 | return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED); | |
1633 | } | |
1634 | ||
1635 | /* called with rt6_exception_lock held */ | |
1636 | static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh, | |
1637 | spinlock_t *lock) | |
1638 | { | |
1639 | struct rt6_exception_bucket *bucket; | |
1640 | unsigned long p; | |
1641 | ||
1642 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1643 | lockdep_is_held(lock)); | |
1644 | ||
1645 | p = (unsigned long)bucket; | |
1646 | p |= FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1647 | bucket = (struct rt6_exception_bucket *)p; | |
1648 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); | |
1649 | } | |
1650 | ||
35732d01 | 1651 | static int rt6_insert_exception(struct rt6_info *nrt, |
5012f0a5 | 1652 | const struct fib6_result *res) |
35732d01 | 1653 | { |
5e670d84 | 1654 | struct net *net = dev_net(nrt->dst.dev); |
35732d01 | 1655 | struct rt6_exception_bucket *bucket; |
cc5c073a | 1656 | struct fib6_info *f6i = res->f6i; |
35732d01 WW |
1657 | struct in6_addr *src_key = NULL; |
1658 | struct rt6_exception *rt6_ex; | |
cc5c073a | 1659 | struct fib6_nh *nh = res->nh; |
a00df2ca | 1660 | int max_depth; |
35732d01 WW |
1661 | int err = 0; |
1662 | ||
35732d01 WW |
1663 | spin_lock_bh(&rt6_exception_lock); |
1664 | ||
cc5c073a DA |
1665 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, |
1666 | lockdep_is_held(&rt6_exception_lock)); | |
35732d01 WW |
1667 | if (!bucket) { |
1668 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1669 | GFP_ATOMIC); | |
1670 | if (!bucket) { | |
1671 | err = -ENOMEM; | |
1672 | goto out; | |
1673 | } | |
cc5c073a DA |
1674 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); |
1675 | } else if (fib6_nh_excptn_bucket_flushed(bucket)) { | |
1676 | err = -EINVAL; | |
1677 | goto out; | |
35732d01 WW |
1678 | } |
1679 | ||
1680 | #ifdef CONFIG_IPV6_SUBTREES | |
5012f0a5 | 1681 | /* fib6_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1682 | * and exception table is indexed by a hash of |
5012f0a5 | 1683 | * both fib6_dst and fib6_src. |
35732d01 | 1684 | * Otherwise, the exception table is indexed by |
5012f0a5 | 1685 | * a hash of only fib6_dst. |
35732d01 | 1686 | */ |
5012f0a5 | 1687 | if (f6i->fib6_src.plen) |
35732d01 WW |
1688 | src_key = &nrt->rt6i_src.addr; |
1689 | #endif | |
5012f0a5 | 1690 | /* rt6_mtu_change() might lower mtu on f6i. |
f5bbe7ee | 1691 | * Only insert this exception route if its mtu |
5012f0a5 | 1692 | * is less than f6i's mtu value. |
f5bbe7ee | 1693 | */ |
b748f260 | 1694 | if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) { |
f5bbe7ee WW |
1695 | err = -EINVAL; |
1696 | goto out; | |
1697 | } | |
60006a48 | 1698 | |
35732d01 WW |
1699 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1700 | src_key); | |
1701 | if (rt6_ex) | |
1702 | rt6_remove_exception(bucket, rt6_ex); | |
1703 | ||
1704 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1705 | if (!rt6_ex) { | |
1706 | err = -ENOMEM; | |
1707 | goto out; | |
1708 | } | |
1709 | rt6_ex->rt6i = nrt; | |
1710 | rt6_ex->stamp = jiffies; | |
35732d01 WW |
1711 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); |
1712 | bucket->depth++; | |
81eb8447 | 1713 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 | 1714 | |
a00df2ca ED |
1715 | /* Randomize max depth to avoid some side channels attacks. */ |
1716 | max_depth = FIB6_MAX_DEPTH + prandom_u32_max(FIB6_MAX_DEPTH); | |
1717 | while (bucket->depth > max_depth) | |
35732d01 WW |
1718 | rt6_exception_remove_oldest(bucket); |
1719 | ||
1720 | out: | |
1721 | spin_unlock_bh(&rt6_exception_lock); | |
1722 | ||
1723 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1724 | if (!err) { |
5012f0a5 DA |
1725 | spin_lock_bh(&f6i->fib6_table->tb6_lock); |
1726 | fib6_update_sernum(net, f6i); | |
1727 | spin_unlock_bh(&f6i->fib6_table->tb6_lock); | |
b886d5f2 PA |
1728 | fib6_force_start_gc(net); |
1729 | } | |
35732d01 WW |
1730 | |
1731 | return err; | |
1732 | } | |
1733 | ||
c0b220cf | 1734 | static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from) |
35732d01 WW |
1735 | { |
1736 | struct rt6_exception_bucket *bucket; | |
1737 | struct rt6_exception *rt6_ex; | |
1738 | struct hlist_node *tmp; | |
1739 | int i; | |
1740 | ||
1741 | spin_lock_bh(&rt6_exception_lock); | |
35732d01 | 1742 | |
cc5c073a | 1743 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
35732d01 WW |
1744 | if (!bucket) |
1745 | goto out; | |
1746 | ||
cc5c073a DA |
1747 | /* Prevent rt6_insert_exception() to recreate the bucket list */ |
1748 | if (!from) | |
1749 | fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock); | |
1750 | ||
35732d01 | 1751 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { |
cc5c073a DA |
1752 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) { |
1753 | if (!from || | |
1754 | rcu_access_pointer(rt6_ex->rt6i->from) == from) | |
1755 | rt6_remove_exception(bucket, rt6_ex); | |
1756 | } | |
1757 | WARN_ON_ONCE(!from && bucket->depth); | |
35732d01 WW |
1758 | bucket++; |
1759 | } | |
35732d01 WW |
1760 | out: |
1761 | spin_unlock_bh(&rt6_exception_lock); | |
1762 | } | |
1763 | ||
e659ba31 DA |
1764 | static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg) |
1765 | { | |
1766 | struct fib6_info *f6i = arg; | |
1767 | ||
1768 | fib6_nh_flush_exceptions(nh, f6i); | |
1769 | ||
1770 | return 0; | |
1771 | } | |
1772 | ||
c0b220cf DA |
1773 | void rt6_flush_exceptions(struct fib6_info *f6i) |
1774 | { | |
e659ba31 DA |
1775 | if (f6i->nh) |
1776 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions, | |
1777 | f6i); | |
1778 | else | |
1779 | fib6_nh_flush_exceptions(f6i->fib6_nh, f6i); | |
c0b220cf DA |
1780 | } |
1781 | ||
35732d01 WW |
1782 | /* Find cached rt in the hash table inside passed in rt |
1783 | * Caller has to hold rcu_read_lock() | |
1784 | */ | |
7e4b5128 | 1785 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
1786 | const struct in6_addr *daddr, |
1787 | const struct in6_addr *saddr) | |
35732d01 | 1788 | { |
510e2ced | 1789 | const struct in6_addr *src_key = NULL; |
35732d01 | 1790 | struct rt6_exception_bucket *bucket; |
35732d01 | 1791 | struct rt6_exception *rt6_ex; |
7e4b5128 | 1792 | struct rt6_info *ret = NULL; |
35732d01 | 1793 | |
35732d01 | 1794 | #ifdef CONFIG_IPV6_SUBTREES |
7e4b5128 | 1795 | /* fib6i_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1796 | * and exception table is indexed by a hash of |
7e4b5128 | 1797 | * both fib6_dst and fib6_src. |
510e2ced WW |
1798 | * However, the src addr used to create the hash |
1799 | * might not be exactly the passed in saddr which | |
1800 | * is a /128 addr from the flow. | |
1801 | * So we need to use f6i->fib6_src to redo lookup | |
1802 | * if the passed in saddr does not find anything. | |
1803 | * (See the logic in ip6_rt_cache_alloc() on how | |
1804 | * rt->rt6i_src is updated.) | |
35732d01 | 1805 | */ |
7e4b5128 | 1806 | if (res->f6i->fib6_src.plen) |
35732d01 | 1807 | src_key = saddr; |
510e2ced | 1808 | find_ex: |
35732d01 | 1809 | #endif |
cc5c073a | 1810 | bucket = fib6_nh_get_excptn_bucket(res->nh, NULL); |
35732d01 WW |
1811 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); |
1812 | ||
1813 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
7e4b5128 | 1814 | ret = rt6_ex->rt6i; |
35732d01 | 1815 | |
510e2ced WW |
1816 | #ifdef CONFIG_IPV6_SUBTREES |
1817 | /* Use fib6_src as src_key and redo lookup */ | |
1818 | if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) { | |
1819 | src_key = &res->f6i->fib6_src.addr; | |
1820 | goto find_ex; | |
1821 | } | |
1822 | #endif | |
1823 | ||
7e4b5128 | 1824 | return ret; |
35732d01 WW |
1825 | } |
1826 | ||
1827 | /* Remove the passed in cached rt from the hash table that contains it */ | |
cc5c073a | 1828 | static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1829 | const struct rt6_info *rt) |
35732d01 | 1830 | { |
c0b220cf | 1831 | const struct in6_addr *src_key = NULL; |
35732d01 | 1832 | struct rt6_exception_bucket *bucket; |
35732d01 WW |
1833 | struct rt6_exception *rt6_ex; |
1834 | int err; | |
1835 | ||
cc5c073a | 1836 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
35732d01 WW |
1837 | return -ENOENT; |
1838 | ||
1839 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a DA |
1840 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
1841 | ||
35732d01 | 1842 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1843 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1844 | * and exception table is indexed by a hash of | |
1845 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1846 | * Otherwise, the exception table is indexed by |
1847 | * a hash of only rt6i_dst. | |
1848 | */ | |
c0b220cf | 1849 | if (plen) |
35732d01 WW |
1850 | src_key = &rt->rt6i_src.addr; |
1851 | #endif | |
1852 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1853 | &rt->rt6i_dst.addr, | |
1854 | src_key); | |
1855 | if (rt6_ex) { | |
1856 | rt6_remove_exception(bucket, rt6_ex); | |
1857 | err = 0; | |
1858 | } else { | |
1859 | err = -ENOENT; | |
1860 | } | |
1861 | ||
1862 | spin_unlock_bh(&rt6_exception_lock); | |
1863 | return err; | |
1864 | } | |
1865 | ||
e659ba31 DA |
1866 | struct fib6_nh_excptn_arg { |
1867 | struct rt6_info *rt; | |
1868 | int plen; | |
1869 | }; | |
1870 | ||
1871 | static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg) | |
1872 | { | |
1873 | struct fib6_nh_excptn_arg *arg = _arg; | |
1874 | int err; | |
1875 | ||
1876 | err = fib6_nh_remove_exception(nh, arg->plen, arg->rt); | |
1877 | if (err == 0) | |
1878 | return 1; | |
1879 | ||
1880 | return 0; | |
1881 | } | |
1882 | ||
c0b220cf DA |
1883 | static int rt6_remove_exception_rt(struct rt6_info *rt) |
1884 | { | |
1885 | struct fib6_info *from; | |
1886 | ||
1887 | from = rcu_dereference(rt->from); | |
cc5c073a | 1888 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) |
c0b220cf DA |
1889 | return -EINVAL; |
1890 | ||
e659ba31 DA |
1891 | if (from->nh) { |
1892 | struct fib6_nh_excptn_arg arg = { | |
1893 | .rt = rt, | |
1894 | .plen = from->fib6_src.plen | |
1895 | }; | |
1896 | int rc; | |
1897 | ||
1898 | /* rc = 1 means an entry was found */ | |
1899 | rc = nexthop_for_each_fib6_nh(from->nh, | |
1900 | rt6_nh_remove_exception_rt, | |
1901 | &arg); | |
1902 | return rc ? 0 : -ENOENT; | |
1903 | } | |
1904 | ||
1cf844c7 | 1905 | return fib6_nh_remove_exception(from->fib6_nh, |
cc5c073a | 1906 | from->fib6_src.plen, rt); |
c0b220cf DA |
1907 | } |
1908 | ||
35732d01 WW |
1909 | /* Find rt6_ex which contains the passed in rt cache and |
1910 | * refresh its stamp | |
1911 | */ | |
cc5c073a | 1912 | static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1913 | const struct rt6_info *rt) |
35732d01 | 1914 | { |
c0b220cf | 1915 | const struct in6_addr *src_key = NULL; |
35732d01 | 1916 | struct rt6_exception_bucket *bucket; |
35732d01 | 1917 | struct rt6_exception *rt6_ex; |
193f3685 | 1918 | |
cc5c073a | 1919 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); |
35732d01 | 1920 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1921 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1922 | * and exception table is indexed by a hash of | |
1923 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1924 | * Otherwise, the exception table is indexed by |
1925 | * a hash of only rt6i_dst. | |
1926 | */ | |
c0b220cf | 1927 | if (plen) |
35732d01 WW |
1928 | src_key = &rt->rt6i_src.addr; |
1929 | #endif | |
cc5c073a | 1930 | rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key); |
35732d01 WW |
1931 | if (rt6_ex) |
1932 | rt6_ex->stamp = jiffies; | |
c0b220cf DA |
1933 | } |
1934 | ||
e659ba31 DA |
1935 | struct fib6_nh_match_arg { |
1936 | const struct net_device *dev; | |
1937 | const struct in6_addr *gw; | |
1938 | struct fib6_nh *match; | |
1939 | }; | |
1940 | ||
1941 | /* determine if fib6_nh has given device and gateway */ | |
1942 | static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
1943 | { | |
1944 | struct fib6_nh_match_arg *arg = _arg; | |
1945 | ||
1946 | if (arg->dev != nh->fib_nh_dev || | |
1947 | (arg->gw && !nh->fib_nh_gw_family) || | |
1948 | (!arg->gw && nh->fib_nh_gw_family) || | |
1949 | (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6))) | |
1950 | return 0; | |
1951 | ||
1952 | arg->match = nh; | |
1953 | ||
1954 | /* found a match, break the loop */ | |
1955 | return 1; | |
1956 | } | |
1957 | ||
c0b220cf DA |
1958 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) |
1959 | { | |
1960 | struct fib6_info *from; | |
e659ba31 | 1961 | struct fib6_nh *fib6_nh; |
35732d01 | 1962 | |
c0b220cf DA |
1963 | rcu_read_lock(); |
1964 | ||
1965 | from = rcu_dereference(rt->from); | |
1966 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) | |
1967 | goto unlock; | |
1968 | ||
e659ba31 DA |
1969 | if (from->nh) { |
1970 | struct fib6_nh_match_arg arg = { | |
1971 | .dev = rt->dst.dev, | |
1972 | .gw = &rt->rt6i_gateway, | |
1973 | }; | |
1974 | ||
1975 | nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg); | |
1976 | ||
1977 | if (!arg.match) | |
cff6a327 | 1978 | goto unlock; |
e659ba31 DA |
1979 | fib6_nh = arg.match; |
1980 | } else { | |
1981 | fib6_nh = from->fib6_nh; | |
1982 | } | |
1983 | fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt); | |
193f3685 | 1984 | unlock: |
35732d01 WW |
1985 | rcu_read_unlock(); |
1986 | } | |
1987 | ||
e9fa1495 SB |
1988 | static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev, |
1989 | struct rt6_info *rt, int mtu) | |
1990 | { | |
1991 | /* If the new MTU is lower than the route PMTU, this new MTU will be the | |
1992 | * lowest MTU in the path: always allow updating the route PMTU to | |
1993 | * reflect PMTU decreases. | |
1994 | * | |
1995 | * If the new MTU is higher, and the route PMTU is equal to the local | |
1996 | * MTU, this means the old MTU is the lowest in the path, so allow | |
1997 | * updating it: if other nodes now have lower MTUs, PMTU discovery will | |
1998 | * handle this. | |
1999 | */ | |
2000 | ||
2001 | if (dst_mtu(&rt->dst) >= mtu) | |
2002 | return true; | |
2003 | ||
2004 | if (dst_mtu(&rt->dst) == idev->cnf.mtu6) | |
2005 | return true; | |
2006 | ||
2007 | return false; | |
2008 | } | |
2009 | ||
2010 | static void rt6_exceptions_update_pmtu(struct inet6_dev *idev, | |
cc5c073a | 2011 | const struct fib6_nh *nh, int mtu) |
f5bbe7ee WW |
2012 | { |
2013 | struct rt6_exception_bucket *bucket; | |
2014 | struct rt6_exception *rt6_ex; | |
2015 | int i; | |
2016 | ||
cc5c073a | 2017 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
e9fa1495 SB |
2018 | if (!bucket) |
2019 | return; | |
2020 | ||
2021 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2022 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
2023 | struct rt6_info *entry = rt6_ex->rt6i; | |
2024 | ||
2025 | /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected | |
d4ead6b3 | 2026 | * route), the metrics of its rt->from have already |
e9fa1495 SB |
2027 | * been updated. |
2028 | */ | |
d4ead6b3 | 2029 | if (dst_metric_raw(&entry->dst, RTAX_MTU) && |
e9fa1495 | 2030 | rt6_mtu_change_route_allowed(idev, entry, mtu)) |
d4ead6b3 | 2031 | dst_metric_set(&entry->dst, RTAX_MTU, mtu); |
f5bbe7ee | 2032 | } |
e9fa1495 | 2033 | bucket++; |
f5bbe7ee WW |
2034 | } |
2035 | } | |
2036 | ||
b16cb459 WW |
2037 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
2038 | ||
cc5c073a DA |
2039 | static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh, |
2040 | const struct in6_addr *gateway) | |
b16cb459 WW |
2041 | { |
2042 | struct rt6_exception_bucket *bucket; | |
2043 | struct rt6_exception *rt6_ex; | |
2044 | struct hlist_node *tmp; | |
2045 | int i; | |
2046 | ||
cc5c073a | 2047 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
b16cb459 WW |
2048 | return; |
2049 | ||
2050 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 2051 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
b16cb459 WW |
2052 | if (bucket) { |
2053 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2054 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2055 | &bucket->chain, hlist) { | |
2056 | struct rt6_info *entry = rt6_ex->rt6i; | |
2057 | ||
2058 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
2059 | RTF_CACHE_GATEWAY && | |
2060 | ipv6_addr_equal(gateway, | |
2061 | &entry->rt6i_gateway)) { | |
2062 | rt6_remove_exception(bucket, rt6_ex); | |
2063 | } | |
2064 | } | |
2065 | bucket++; | |
2066 | } | |
2067 | } | |
2068 | ||
2069 | spin_unlock_bh(&rt6_exception_lock); | |
2070 | } | |
2071 | ||
c757faa8 WW |
2072 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
2073 | struct rt6_exception *rt6_ex, | |
2074 | struct fib6_gc_args *gc_args, | |
2075 | unsigned long now) | |
2076 | { | |
2077 | struct rt6_info *rt = rt6_ex->rt6i; | |
2078 | ||
1859bac0 PA |
2079 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
2080 | * even if others have still references to them, so that on next | |
2081 | * dst_check() such references can be dropped. | |
2082 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
2083 | * expired, independently from their aging, as per RFC 8201 section 4 | |
2084 | */ | |
31afeb42 WW |
2085 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
2086 | if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { | |
2087 | RT6_TRACE("aging clone %p\n", rt); | |
2088 | rt6_remove_exception(bucket, rt6_ex); | |
2089 | return; | |
2090 | } | |
2091 | } else if (time_after(jiffies, rt->dst.expires)) { | |
2092 | RT6_TRACE("purging expired route %p\n", rt); | |
c757faa8 WW |
2093 | rt6_remove_exception(bucket, rt6_ex); |
2094 | return; | |
31afeb42 WW |
2095 | } |
2096 | ||
2097 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
c757faa8 | 2098 | struct neighbour *neigh; |
c757faa8 | 2099 | |
1bfa26ff | 2100 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
1bfa26ff | 2101 | |
b7a320c3 | 2102 | if (!(neigh && (neigh->flags & NTF_ROUTER))) { |
c757faa8 WW |
2103 | RT6_TRACE("purging route %p via non-router but gateway\n", |
2104 | rt); | |
2105 | rt6_remove_exception(bucket, rt6_ex); | |
2106 | return; | |
2107 | } | |
2108 | } | |
31afeb42 | 2109 | |
c757faa8 WW |
2110 | gc_args->more++; |
2111 | } | |
2112 | ||
cc5c073a | 2113 | static void fib6_nh_age_exceptions(const struct fib6_nh *nh, |
c0b220cf DA |
2114 | struct fib6_gc_args *gc_args, |
2115 | unsigned long now) | |
c757faa8 WW |
2116 | { |
2117 | struct rt6_exception_bucket *bucket; | |
2118 | struct rt6_exception *rt6_ex; | |
2119 | struct hlist_node *tmp; | |
2120 | int i; | |
2121 | ||
cc5c073a | 2122 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
c757faa8 WW |
2123 | return; |
2124 | ||
1bfa26ff ED |
2125 | rcu_read_lock_bh(); |
2126 | spin_lock(&rt6_exception_lock); | |
cc5c073a | 2127 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
c757faa8 WW |
2128 | if (bucket) { |
2129 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2130 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2131 | &bucket->chain, hlist) { | |
2132 | rt6_age_examine_exception(bucket, rt6_ex, | |
2133 | gc_args, now); | |
2134 | } | |
2135 | bucket++; | |
2136 | } | |
2137 | } | |
1bfa26ff ED |
2138 | spin_unlock(&rt6_exception_lock); |
2139 | rcu_read_unlock_bh(); | |
c757faa8 WW |
2140 | } |
2141 | ||
e659ba31 DA |
2142 | struct fib6_nh_age_excptn_arg { |
2143 | struct fib6_gc_args *gc_args; | |
2144 | unsigned long now; | |
2145 | }; | |
2146 | ||
2147 | static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg) | |
2148 | { | |
2149 | struct fib6_nh_age_excptn_arg *arg = _arg; | |
2150 | ||
2151 | fib6_nh_age_exceptions(nh, arg->gc_args, arg->now); | |
2152 | return 0; | |
2153 | } | |
2154 | ||
cc5c073a | 2155 | void rt6_age_exceptions(struct fib6_info *f6i, |
c0b220cf DA |
2156 | struct fib6_gc_args *gc_args, |
2157 | unsigned long now) | |
2158 | { | |
e659ba31 DA |
2159 | if (f6i->nh) { |
2160 | struct fib6_nh_age_excptn_arg arg = { | |
2161 | .gc_args = gc_args, | |
2162 | .now = now | |
2163 | }; | |
2164 | ||
2165 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions, | |
2166 | &arg); | |
2167 | } else { | |
2168 | fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now); | |
2169 | } | |
c0b220cf DA |
2170 | } |
2171 | ||
1d053da9 | 2172 | /* must be called with rcu lock held */ |
effda4dd DA |
2173 | int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif, |
2174 | struct flowi6 *fl6, struct fib6_result *res, int strict) | |
1da177e4 | 2175 | { |
367efcb9 | 2176 | struct fib6_node *fn, *saved_fn; |
1da177e4 | 2177 | |
6454743b | 2178 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 2179 | saved_fn = fn; |
1da177e4 | 2180 | |
a3c00e46 | 2181 | redo_rt6_select: |
effda4dd DA |
2182 | rt6_select(net, fn, oif, res, strict); |
2183 | if (res->f6i == net->ipv6.fib6_null_entry) { | |
a3c00e46 MKL |
2184 | fn = fib6_backtrack(fn, &fl6->saddr); |
2185 | if (fn) | |
2186 | goto redo_rt6_select; | |
367efcb9 MKL |
2187 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
2188 | /* also consider unreachable route */ | |
2189 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
2190 | fn = saved_fn; | |
2191 | goto redo_rt6_select; | |
367efcb9 | 2192 | } |
a3c00e46 MKL |
2193 | } |
2194 | ||
effda4dd | 2195 | trace_fib6_table_lookup(net, res, table, fl6); |
fb9de91e | 2196 | |
effda4dd | 2197 | return 0; |
1d053da9 DA |
2198 | } |
2199 | ||
2200 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, | |
2201 | int oif, struct flowi6 *fl6, | |
2202 | const struct sk_buff *skb, int flags) | |
2203 | { | |
b1d40991 | 2204 | struct fib6_result res = {}; |
0e09edcc | 2205 | struct rt6_info *rt = NULL; |
1d053da9 DA |
2206 | int strict = 0; |
2207 | ||
0e09edcc WW |
2208 | WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) && |
2209 | !rcu_read_lock_held()); | |
2210 | ||
1d053da9 DA |
2211 | strict |= flags & RT6_LOOKUP_F_IFACE; |
2212 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; | |
2213 | if (net->ipv6.devconf_all->forwarding == 0) | |
2214 | strict |= RT6_LOOKUP_F_REACHABLE; | |
2215 | ||
2216 | rcu_read_lock(); | |
2217 | ||
effda4dd | 2218 | fib6_table_lookup(net, table, oif, fl6, &res, strict); |
0e09edcc WW |
2219 | if (res.f6i == net->ipv6.fib6_null_entry) |
2220 | goto out; | |
23fb93a4 | 2221 | |
b1d40991 | 2222 | fib6_select_path(net, &res, fl6, oif, false, skb, strict); |
d83009d4 | 2223 | |
23fb93a4 | 2224 | /*Search through exception table */ |
7e4b5128 | 2225 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 2226 | if (rt) { |
0e09edcc | 2227 | goto out; |
3da59bd9 | 2228 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
b1d40991 | 2229 | !res.nh->fib_nh_gw_family)) { |
3da59bd9 MKL |
2230 | /* Create a RTF_CACHE clone which will not be |
2231 | * owned by the fib6 tree. It is for the special case where | |
2232 | * the daddr in the skb during the neighbor look-up is different | |
2233 | * from the fl6->daddr used to look-up route here. | |
2234 | */ | |
0e09edcc | 2235 | rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); |
c71099ac | 2236 | |
0e09edcc WW |
2237 | if (rt) { |
2238 | /* 1 refcnt is taken during ip6_rt_cache_alloc(). | |
2239 | * As rt6_uncached_list_add() does not consume refcnt, | |
2240 | * this refcnt is always returned to the caller even | |
2241 | * if caller sets RT6_LOOKUP_F_DST_NOREF flag. | |
1cfb71ee | 2242 | */ |
0e09edcc | 2243 | rt6_uncached_list_add(rt); |
0e09edcc | 2244 | rcu_read_unlock(); |
b811580d | 2245 | |
0e09edcc WW |
2246 | return rt; |
2247 | } | |
d52d3997 MKL |
2248 | } else { |
2249 | /* Get a percpu copy */ | |
951f788a | 2250 | local_bh_disable(); |
0e09edcc | 2251 | rt = rt6_get_pcpu_route(&res); |
d52d3997 | 2252 | |
0e09edcc WW |
2253 | if (!rt) |
2254 | rt = rt6_make_pcpu_route(net, &res); | |
93531c67 | 2255 | |
951f788a | 2256 | local_bh_enable(); |
d52d3997 | 2257 | } |
0e09edcc WW |
2258 | out: |
2259 | if (!rt) | |
2260 | rt = net->ipv6.ip6_null_entry; | |
2261 | if (!(flags & RT6_LOOKUP_F_DST_NOREF)) | |
2262 | ip6_hold_safe(net, &rt); | |
2263 | rcu_read_unlock(); | |
2264 | ||
2265 | return rt; | |
1da177e4 | 2266 | } |
9ff74384 | 2267 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 2268 | |
55cced4f | 2269 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net, |
b75cc8f9 DA |
2270 | struct fib6_table *table, |
2271 | struct flowi6 *fl6, | |
2272 | const struct sk_buff *skb, | |
2273 | int flags) | |
4acad72d | 2274 | { |
b75cc8f9 | 2275 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags); |
4acad72d PE |
2276 | } |
2277 | ||
d409b847 MB |
2278 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
2279 | struct net_device *dev, | |
b75cc8f9 DA |
2280 | struct flowi6 *fl6, |
2281 | const struct sk_buff *skb, | |
2282 | int flags) | |
72331bc0 SL |
2283 | { |
2284 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
2285 | flags |= RT6_LOOKUP_F_IFACE; | |
2286 | ||
b75cc8f9 | 2287 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input); |
72331bc0 | 2288 | } |
d409b847 | 2289 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 2290 | |
23aebdac | 2291 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
5e5d6fed RP |
2292 | struct flow_keys *keys, |
2293 | struct flow_keys *flkeys) | |
23aebdac JS |
2294 | { |
2295 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
2296 | const struct ipv6hdr *key_iph = outer_iph; | |
5e5d6fed | 2297 | struct flow_keys *_flkeys = flkeys; |
23aebdac JS |
2298 | const struct ipv6hdr *inner_iph; |
2299 | const struct icmp6hdr *icmph; | |
2300 | struct ipv6hdr _inner_iph; | |
cea67a2d | 2301 | struct icmp6hdr _icmph; |
23aebdac JS |
2302 | |
2303 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
2304 | goto out; | |
2305 | ||
cea67a2d ED |
2306 | icmph = skb_header_pointer(skb, skb_transport_offset(skb), |
2307 | sizeof(_icmph), &_icmph); | |
2308 | if (!icmph) | |
2309 | goto out; | |
2310 | ||
54074f1d | 2311 | if (!icmpv6_is_err(icmph->icmp6_type)) |
23aebdac JS |
2312 | goto out; |
2313 | ||
2314 | inner_iph = skb_header_pointer(skb, | |
2315 | skb_transport_offset(skb) + sizeof(*icmph), | |
2316 | sizeof(_inner_iph), &_inner_iph); | |
2317 | if (!inner_iph) | |
2318 | goto out; | |
2319 | ||
2320 | key_iph = inner_iph; | |
5e5d6fed | 2321 | _flkeys = NULL; |
23aebdac | 2322 | out: |
5e5d6fed RP |
2323 | if (_flkeys) { |
2324 | keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src; | |
2325 | keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst; | |
2326 | keys->tags.flow_label = _flkeys->tags.flow_label; | |
2327 | keys->basic.ip_proto = _flkeys->basic.ip_proto; | |
2328 | } else { | |
2329 | keys->addrs.v6addrs.src = key_iph->saddr; | |
2330 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
fa1be7e0 | 2331 | keys->tags.flow_label = ip6_flowlabel(key_iph); |
5e5d6fed RP |
2332 | keys->basic.ip_proto = key_iph->nexthdr; |
2333 | } | |
23aebdac JS |
2334 | } |
2335 | ||
73c2c5cb IS |
2336 | static u32 rt6_multipath_custom_hash_outer(const struct net *net, |
2337 | const struct sk_buff *skb, | |
2338 | bool *p_has_inner) | |
2339 | { | |
2340 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2341 | struct flow_keys keys, hash_keys; | |
2342 | ||
2343 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
2344 | return 0; | |
2345 | ||
2346 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2347 | skb_flow_dissect_flow_keys(skb, &keys, FLOW_DISSECTOR_F_STOP_AT_ENCAP); | |
2348 | ||
2349 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2350 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
2351 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
2352 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
2353 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
2354 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
2355 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
2356 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL) | |
2357 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
2358 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
2359 | hash_keys.ports.src = keys.ports.src; | |
2360 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
2361 | hash_keys.ports.dst = keys.ports.dst; | |
2362 | ||
2363 | *p_has_inner = !!(keys.control.flags & FLOW_DIS_ENCAPSULATION); | |
2364 | return flow_hash_from_keys(&hash_keys); | |
2365 | } | |
2366 | ||
2367 | static u32 rt6_multipath_custom_hash_inner(const struct net *net, | |
2368 | const struct sk_buff *skb, | |
2369 | bool has_inner) | |
2370 | { | |
2371 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2372 | struct flow_keys keys, hash_keys; | |
2373 | ||
2374 | /* We assume the packet carries an encapsulation, but if none was | |
2375 | * encountered during dissection of the outer flow, then there is no | |
2376 | * point in calling the flow dissector again. | |
2377 | */ | |
2378 | if (!has_inner) | |
2379 | return 0; | |
2380 | ||
2381 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK)) | |
2382 | return 0; | |
2383 | ||
2384 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2385 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2386 | ||
2387 | if (!(keys.control.flags & FLOW_DIS_ENCAPSULATION)) | |
2388 | return 0; | |
2389 | ||
2390 | if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2391 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2392 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
2393 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
2394 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
2395 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
2396 | } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2397 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2398 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
2399 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
2400 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
2401 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
2402 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL) | |
2403 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
2404 | } | |
2405 | ||
2406 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO) | |
2407 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
2408 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT) | |
2409 | hash_keys.ports.src = keys.ports.src; | |
2410 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) | |
2411 | hash_keys.ports.dst = keys.ports.dst; | |
2412 | ||
2413 | return flow_hash_from_keys(&hash_keys); | |
2414 | } | |
2415 | ||
2416 | static u32 rt6_multipath_custom_hash_skb(const struct net *net, | |
2417 | const struct sk_buff *skb) | |
2418 | { | |
2419 | u32 mhash, mhash_inner; | |
2420 | bool has_inner = true; | |
2421 | ||
2422 | mhash = rt6_multipath_custom_hash_outer(net, skb, &has_inner); | |
2423 | mhash_inner = rt6_multipath_custom_hash_inner(net, skb, has_inner); | |
2424 | ||
2425 | return jhash_2words(mhash, mhash_inner, 0); | |
2426 | } | |
2427 | ||
2428 | static u32 rt6_multipath_custom_hash_fl6(const struct net *net, | |
2429 | const struct flowi6 *fl6) | |
2430 | { | |
2431 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2432 | struct flow_keys hash_keys; | |
2433 | ||
2434 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
2435 | return 0; | |
2436 | ||
2437 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2438 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2439 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
2440 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2441 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
2442 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2443 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
2444 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2445 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL) | |
2446 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2447 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
2448 | hash_keys.ports.src = fl6->fl6_sport; | |
2449 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
2450 | hash_keys.ports.dst = fl6->fl6_dport; | |
2451 | ||
2452 | return flow_hash_from_keys(&hash_keys); | |
2453 | } | |
2454 | ||
23aebdac | 2455 | /* if skb is set it will be used and fl6 can be NULL */ |
b4bac172 DA |
2456 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
2457 | const struct sk_buff *skb, struct flow_keys *flkeys) | |
23aebdac JS |
2458 | { |
2459 | struct flow_keys hash_keys; | |
b95b6e07 | 2460 | u32 mhash = 0; |
23aebdac | 2461 | |
bbfa047a | 2462 | switch (ip6_multipath_hash_policy(net)) { |
b4bac172 DA |
2463 | case 0: |
2464 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2465 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2466 | if (skb) { | |
2467 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2468 | } else { | |
2469 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2470 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
fa1be7e0 | 2471 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
b4bac172 DA |
2472 | hash_keys.basic.ip_proto = fl6->flowi6_proto; |
2473 | } | |
b95b6e07 | 2474 | mhash = flow_hash_from_keys(&hash_keys); |
b4bac172 DA |
2475 | break; |
2476 | case 1: | |
2477 | if (skb) { | |
2478 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2479 | struct flow_keys keys; | |
2480 | ||
2481 | /* short-circuit if we already have L4 hash present */ | |
2482 | if (skb->l4_hash) | |
2483 | return skb_get_hash_raw(skb) >> 1; | |
2484 | ||
2485 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2486 | ||
13fdb940 | 2487 | if (!flkeys) { |
b4bac172 DA |
2488 | skb_flow_dissect_flow_keys(skb, &keys, flag); |
2489 | flkeys = &keys; | |
2490 | } | |
2491 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2492 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2493 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2494 | hash_keys.ports.src = flkeys->ports.src; | |
2495 | hash_keys.ports.dst = flkeys->ports.dst; | |
2496 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2497 | } else { | |
2498 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2499 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2500 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2501 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2502 | hash_keys.ports.src = fl6->fl6_sport; | |
2503 | hash_keys.ports.dst = fl6->fl6_dport; | |
2504 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2505 | } | |
b95b6e07 | 2506 | mhash = flow_hash_from_keys(&hash_keys); |
b4bac172 | 2507 | break; |
d8f74f09 SS |
2508 | case 2: |
2509 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2510 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2511 | if (skb) { | |
2512 | struct flow_keys keys; | |
2513 | ||
2514 | if (!flkeys) { | |
2515 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2516 | flkeys = &keys; | |
2517 | } | |
2518 | ||
2519 | /* Inner can be v4 or v6 */ | |
2520 | if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2521 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2522 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
2523 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
2524 | } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2525 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2526 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2527 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2528 | hash_keys.tags.flow_label = flkeys->tags.flow_label; | |
2529 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2530 | } else { | |
2531 | /* Same as case 0 */ | |
2532 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2533 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2534 | } | |
2535 | } else { | |
2536 | /* Same as case 0 */ | |
2537 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2538 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2539 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2540 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2541 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2542 | } | |
b95b6e07 | 2543 | mhash = flow_hash_from_keys(&hash_keys); |
d8f74f09 | 2544 | break; |
73c2c5cb IS |
2545 | case 3: |
2546 | if (skb) | |
2547 | mhash = rt6_multipath_custom_hash_skb(net, skb); | |
2548 | else | |
2549 | mhash = rt6_multipath_custom_hash_fl6(net, fl6); | |
2550 | break; | |
23aebdac JS |
2551 | } |
2552 | ||
9a2a537a | 2553 | return mhash >> 1; |
23aebdac JS |
2554 | } |
2555 | ||
67f415dd | 2556 | /* Called with rcu held */ |
c71099ac TG |
2557 | void ip6_route_input(struct sk_buff *skb) |
2558 | { | |
b71d1d42 | 2559 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 2560 | struct net *net = dev_net(skb->dev); |
67f415dd | 2561 | int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF; |
904af04d | 2562 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 2563 | struct flowi6 fl6 = { |
e0d56fdd | 2564 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
2565 | .daddr = iph->daddr, |
2566 | .saddr = iph->saddr, | |
6502ca52 | 2567 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
2568 | .flowi6_mark = skb->mark, |
2569 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 2570 | }; |
5e5d6fed | 2571 | struct flow_keys *flkeys = NULL, _flkeys; |
adaa70bb | 2572 | |
904af04d | 2573 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2574 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 2575 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
5e5d6fed RP |
2576 | |
2577 | if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys)) | |
2578 | flkeys = &_flkeys; | |
2579 | ||
23aebdac | 2580 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
b4bac172 | 2581 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys); |
06e9d040 | 2582 | skb_dst_drop(skb); |
67f415dd WW |
2583 | skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev, |
2584 | &fl6, skb, flags)); | |
c71099ac TG |
2585 | } |
2586 | ||
55cced4f | 2587 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net, |
b75cc8f9 DA |
2588 | struct fib6_table *table, |
2589 | struct flowi6 *fl6, | |
2590 | const struct sk_buff *skb, | |
2591 | int flags) | |
1da177e4 | 2592 | { |
b75cc8f9 | 2593 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags); |
c71099ac TG |
2594 | } |
2595 | ||
7d9e5f42 WW |
2596 | struct dst_entry *ip6_route_output_flags_noref(struct net *net, |
2597 | const struct sock *sk, | |
2598 | struct flowi6 *fl6, int flags) | |
c71099ac | 2599 | { |
d46a9d67 | 2600 | bool any_src; |
c71099ac | 2601 | |
3ede0bbc RS |
2602 | if (ipv6_addr_type(&fl6->daddr) & |
2603 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) { | |
4c1feac5 DA |
2604 | struct dst_entry *dst; |
2605 | ||
7d9e5f42 | 2606 | /* This function does not take refcnt on the dst */ |
4c1feac5 DA |
2607 | dst = l3mdev_link_scope_lookup(net, fl6); |
2608 | if (dst) | |
2609 | return dst; | |
2610 | } | |
ca254490 | 2611 | |
1fb9489b | 2612 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 2613 | |
7d9e5f42 | 2614 | flags |= RT6_LOOKUP_F_DST_NOREF; |
d46a9d67 | 2615 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 2616 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 2617 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 2618 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 2619 | |
d46a9d67 | 2620 | if (!any_src) |
adaa70bb | 2621 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
2622 | else if (sk) |
2623 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 2624 | |
b75cc8f9 | 2625 | return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output); |
1da177e4 | 2626 | } |
7d9e5f42 WW |
2627 | EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref); |
2628 | ||
2629 | struct dst_entry *ip6_route_output_flags(struct net *net, | |
2630 | const struct sock *sk, | |
2631 | struct flowi6 *fl6, | |
2632 | int flags) | |
2633 | { | |
13fdb940 SK |
2634 | struct dst_entry *dst; |
2635 | struct rt6_info *rt6; | |
7d9e5f42 | 2636 | |
13fdb940 SK |
2637 | rcu_read_lock(); |
2638 | dst = ip6_route_output_flags_noref(net, sk, fl6, flags); | |
2639 | rt6 = (struct rt6_info *)dst; | |
2640 | /* For dst cached in uncached_list, refcnt is already taken. */ | |
2641 | if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) { | |
2642 | dst = &net->ipv6.ip6_null_entry->dst; | |
2643 | dst_hold(dst); | |
2644 | } | |
2645 | rcu_read_unlock(); | |
7d9e5f42 | 2646 | |
13fdb940 | 2647 | return dst; |
7d9e5f42 | 2648 | } |
6f21c96a | 2649 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 2650 | |
2774c131 | 2651 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2652 | { |
5c1e6aa3 | 2653 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 2654 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
2655 | struct dst_entry *new = NULL; |
2656 | ||
1dbe3252 | 2657 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 2658 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2659 | if (rt) { |
0a1f5962 | 2660 | rt6_info_init(rt); |
81eb8447 | 2661 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 2662 | |
0a1f5962 | 2663 | new = &rt->dst; |
14e50e57 | 2664 | new->__use = 1; |
352e512c | 2665 | new->input = dst_discard; |
ede2059d | 2666 | new->output = dst_discard_out; |
14e50e57 | 2667 | |
0a1f5962 | 2668 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2669 | |
1dbe3252 | 2670 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 2671 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 2672 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
2673 | |
2674 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
2675 | #ifdef CONFIG_IPV6_SUBTREES | |
2676 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
2677 | #endif | |
14e50e57 DM |
2678 | } |
2679 | ||
69ead7af DM |
2680 | dst_release(dst_orig); |
2681 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 2682 | } |
14e50e57 | 2683 | |
1da177e4 LT |
2684 | /* |
2685 | * Destination cache support functions | |
2686 | */ | |
2687 | ||
8d1c802b | 2688 | static bool fib6_check(struct fib6_info *f6i, u32 cookie) |
4b32b5ad | 2689 | { |
93531c67 DA |
2690 | u32 rt_cookie = 0; |
2691 | ||
8ae86971 | 2692 | if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie) |
93531c67 DA |
2693 | return false; |
2694 | ||
2695 | if (fib6_check_expired(f6i)) | |
2696 | return false; | |
2697 | ||
2698 | return true; | |
4b32b5ad MKL |
2699 | } |
2700 | ||
a68886a6 DA |
2701 | static struct dst_entry *rt6_check(struct rt6_info *rt, |
2702 | struct fib6_info *from, | |
2703 | u32 cookie) | |
3da59bd9 | 2704 | { |
36143645 | 2705 | u32 rt_cookie = 0; |
c5cff856 | 2706 | |
49d05fe2 | 2707 | if (!from || !fib6_get_cookie_safe(from, &rt_cookie) || |
93531c67 | 2708 | rt_cookie != cookie) |
3da59bd9 MKL |
2709 | return NULL; |
2710 | ||
2711 | if (rt6_check_expired(rt)) | |
2712 | return NULL; | |
2713 | ||
2714 | return &rt->dst; | |
2715 | } | |
2716 | ||
a68886a6 DA |
2717 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, |
2718 | struct fib6_info *from, | |
2719 | u32 cookie) | |
3da59bd9 | 2720 | { |
5973fb1e MKL |
2721 | if (!__rt6_check_expired(rt) && |
2722 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
a68886a6 | 2723 | fib6_check(from, cookie)) |
3da59bd9 MKL |
2724 | return &rt->dst; |
2725 | else | |
2726 | return NULL; | |
2727 | } | |
2728 | ||
bbd807df BV |
2729 | INDIRECT_CALLABLE_SCOPE struct dst_entry *ip6_dst_check(struct dst_entry *dst, |
2730 | u32 cookie) | |
1da177e4 | 2731 | { |
a87b7dc9 | 2732 | struct dst_entry *dst_ret; |
a68886a6 | 2733 | struct fib6_info *from; |
1da177e4 LT |
2734 | struct rt6_info *rt; |
2735 | ||
a87b7dc9 DA |
2736 | rt = container_of(dst, struct rt6_info, dst); |
2737 | ||
8f34e53b DA |
2738 | if (rt->sernum) |
2739 | return rt6_is_valid(rt) ? dst : NULL; | |
2740 | ||
a87b7dc9 | 2741 | rcu_read_lock(); |
1da177e4 | 2742 | |
6f3118b5 ND |
2743 | /* All IPV6 dsts are created with ->obsolete set to the value |
2744 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
2745 | * into this function always. | |
2746 | */ | |
e3bc10bd | 2747 | |
a68886a6 | 2748 | from = rcu_dereference(rt->from); |
4b32b5ad | 2749 | |
a68886a6 DA |
2750 | if (from && (rt->rt6i_flags & RTF_PCPU || |
2751 | unlikely(!list_empty(&rt->rt6i_uncached)))) | |
2752 | dst_ret = rt6_dst_from_check(rt, from, cookie); | |
3da59bd9 | 2753 | else |
a68886a6 | 2754 | dst_ret = rt6_check(rt, from, cookie); |
a87b7dc9 DA |
2755 | |
2756 | rcu_read_unlock(); | |
2757 | ||
2758 | return dst_ret; | |
1da177e4 | 2759 | } |
9c97921a | 2760 | EXPORT_INDIRECT_CALLABLE(ip6_dst_check); |
1da177e4 LT |
2761 | |
2762 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
2763 | { | |
2764 | struct rt6_info *rt = (struct rt6_info *) dst; | |
2765 | ||
2766 | if (rt) { | |
54c1a859 | 2767 | if (rt->rt6i_flags & RTF_CACHE) { |
c3c14da0 | 2768 | rcu_read_lock(); |
54c1a859 | 2769 | if (rt6_check_expired(rt)) { |
93531c67 | 2770 | rt6_remove_exception_rt(rt); |
54c1a859 YH |
2771 | dst = NULL; |
2772 | } | |
c3c14da0 | 2773 | rcu_read_unlock(); |
54c1a859 | 2774 | } else { |
1da177e4 | 2775 | dst_release(dst); |
54c1a859 YH |
2776 | dst = NULL; |
2777 | } | |
1da177e4 | 2778 | } |
54c1a859 | 2779 | return dst; |
1da177e4 LT |
2780 | } |
2781 | ||
2782 | static void ip6_link_failure(struct sk_buff *skb) | |
2783 | { | |
2784 | struct rt6_info *rt; | |
2785 | ||
3ffe533c | 2786 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2787 | |
adf30907 | 2788 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2789 | if (rt) { |
8a14e46f | 2790 | rcu_read_lock(); |
1eb4f758 | 2791 | if (rt->rt6i_flags & RTF_CACHE) { |
761f6026 | 2792 | rt6_remove_exception_rt(rt); |
c5cff856 | 2793 | } else { |
a68886a6 | 2794 | struct fib6_info *from; |
c5cff856 WW |
2795 | struct fib6_node *fn; |
2796 | ||
a68886a6 DA |
2797 | from = rcu_dereference(rt->from); |
2798 | if (from) { | |
2799 | fn = rcu_dereference(from->fib6_node); | |
2800 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
aafc2e32 | 2801 | WRITE_ONCE(fn->fn_sernum, -1); |
a68886a6 | 2802 | } |
1eb4f758 | 2803 | } |
8a14e46f | 2804 | rcu_read_unlock(); |
1da177e4 LT |
2805 | } |
2806 | } | |
2807 | ||
6a3e030f DA |
2808 | static void rt6_update_expires(struct rt6_info *rt0, int timeout) |
2809 | { | |
a68886a6 DA |
2810 | if (!(rt0->rt6i_flags & RTF_EXPIRES)) { |
2811 | struct fib6_info *from; | |
2812 | ||
2813 | rcu_read_lock(); | |
2814 | from = rcu_dereference(rt0->from); | |
2815 | if (from) | |
2816 | rt0->dst.expires = from->expires; | |
2817 | rcu_read_unlock(); | |
2818 | } | |
6a3e030f DA |
2819 | |
2820 | dst_set_expires(&rt0->dst, timeout); | |
2821 | rt0->rt6i_flags |= RTF_EXPIRES; | |
2822 | } | |
2823 | ||
45e4fd26 MKL |
2824 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2825 | { | |
2826 | struct net *net = dev_net(rt->dst.dev); | |
2827 | ||
d4ead6b3 | 2828 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
45e4fd26 | 2829 | rt->rt6i_flags |= RTF_MODIFIED; |
45e4fd26 MKL |
2830 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
2831 | } | |
2832 | ||
0d3f6d29 MKL |
2833 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2834 | { | |
2835 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1490ed2a | 2836 | (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from)); |
0d3f6d29 MKL |
2837 | } |
2838 | ||
45e4fd26 | 2839 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
bd085ef6 HL |
2840 | const struct ipv6hdr *iph, u32 mtu, |
2841 | bool confirm_neigh) | |
1da177e4 | 2842 | { |
0dec879f | 2843 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2844 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2845 | |
09454fd0 MŻ |
2846 | /* Note: do *NOT* check dst_metric_locked(dst, RTAX_MTU) |
2847 | * IPv6 pmtu discovery isn't optional, so 'mtu lock' cannot disable it. | |
2848 | * [see also comment in rt6_mtu_change_route()] | |
2849 | */ | |
19bda36c | 2850 | |
0dec879f JA |
2851 | if (iph) { |
2852 | daddr = &iph->daddr; | |
2853 | saddr = &iph->saddr; | |
2854 | } else if (sk) { | |
2855 | daddr = &sk->sk_v6_daddr; | |
2856 | saddr = &inet6_sk(sk)->saddr; | |
2857 | } else { | |
2858 | daddr = NULL; | |
2859 | saddr = NULL; | |
2860 | } | |
bd085ef6 HL |
2861 | |
2862 | if (confirm_neigh) | |
2863 | dst_confirm_neigh(dst, daddr); | |
2864 | ||
4a65dff8 GK |
2865 | if (mtu < IPV6_MIN_MTU) |
2866 | return; | |
45e4fd26 MKL |
2867 | if (mtu >= dst_mtu(dst)) |
2868 | return; | |
9d289715 | 2869 | |
0d3f6d29 | 2870 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2871 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2872 | /* update rt6_ex->stamp for cache */ |
2873 | if (rt6->rt6i_flags & RTF_CACHE) | |
2874 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2875 | } else if (daddr) { |
85bd05de | 2876 | struct fib6_result res = {}; |
45e4fd26 MKL |
2877 | struct rt6_info *nrt6; |
2878 | ||
4d85cd0c | 2879 | rcu_read_lock(); |
85bd05de | 2880 | res.f6i = rcu_dereference(rt6->from); |
43a4b60d DA |
2881 | if (!res.f6i) |
2882 | goto out_unlock; | |
2883 | ||
7d21fec9 DA |
2884 | res.fib6_flags = res.f6i->fib6_flags; |
2885 | res.fib6_type = res.f6i->fib6_type; | |
2886 | ||
2d44234b DA |
2887 | if (res.f6i->nh) { |
2888 | struct fib6_nh_match_arg arg = { | |
2889 | .dev = dst->dev, | |
2890 | .gw = &rt6->rt6i_gateway, | |
2891 | }; | |
2892 | ||
2893 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
2894 | fib6_nh_find_match, &arg); | |
2895 | ||
2896 | /* fib6_info uses a nexthop that does not have fib6_nh | |
2897 | * using the dst->dev + gw. Should be impossible. | |
2898 | */ | |
43a4b60d DA |
2899 | if (!arg.match) |
2900 | goto out_unlock; | |
2d44234b DA |
2901 | |
2902 | res.nh = arg.match; | |
2903 | } else { | |
2904 | res.nh = res.f6i->fib6_nh; | |
2905 | } | |
2906 | ||
85bd05de | 2907 | nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); |
45e4fd26 MKL |
2908 | if (nrt6) { |
2909 | rt6_do_update_pmtu(nrt6, mtu); | |
5012f0a5 | 2910 | if (rt6_insert_exception(nrt6, &res)) |
2b760fcf | 2911 | dst_release_immediate(&nrt6->dst); |
45e4fd26 | 2912 | } |
43a4b60d | 2913 | out_unlock: |
a68886a6 | 2914 | rcu_read_unlock(); |
1da177e4 LT |
2915 | } |
2916 | } | |
2917 | ||
45e4fd26 | 2918 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
2919 | struct sk_buff *skb, u32 mtu, |
2920 | bool confirm_neigh) | |
45e4fd26 | 2921 | { |
bd085ef6 HL |
2922 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu, |
2923 | confirm_neigh); | |
45e4fd26 MKL |
2924 | } |
2925 | ||
42ae66c8 | 2926 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2927 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2928 | { |
2929 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2930 | struct dst_entry *dst; | |
dc92095d MŻ |
2931 | struct flowi6 fl6 = { |
2932 | .flowi6_oif = oif, | |
2933 | .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark), | |
2934 | .daddr = iph->daddr, | |
2935 | .saddr = iph->saddr, | |
2936 | .flowlabel = ip6_flowinfo(iph), | |
2937 | .flowi6_uid = uid, | |
2938 | }; | |
81aded24 DM |
2939 | |
2940 | dst = ip6_route_output(net, NULL, &fl6); | |
2941 | if (!dst->error) | |
bd085ef6 | 2942 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true); |
81aded24 DM |
2943 | dst_release(dst); |
2944 | } | |
2945 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2946 | ||
2947 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2948 | { | |
7ddacfa5 | 2949 | int oif = sk->sk_bound_dev_if; |
33c162a9 MKL |
2950 | struct dst_entry *dst; |
2951 | ||
7ddacfa5 DA |
2952 | if (!oif && skb->dev) |
2953 | oif = l3mdev_master_ifindex(skb->dev); | |
2954 | ||
2955 | ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid); | |
33c162a9 MKL |
2956 | |
2957 | dst = __sk_dst_get(sk); | |
2958 | if (!dst || !dst->obsolete || | |
2959 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2960 | return; | |
2961 | ||
2962 | bh_lock_sock(sk); | |
2963 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2964 | ip6_datagram_dst_update(sk, false); | |
2965 | bh_unlock_sock(sk); | |
81aded24 DM |
2966 | } |
2967 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2968 | ||
7d6850f7 AK |
2969 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
2970 | const struct flowi6 *fl6) | |
2971 | { | |
2972 | #ifdef CONFIG_IPV6_SUBTREES | |
2973 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2974 | #endif | |
2975 | ||
2976 | ip6_dst_store(sk, dst, | |
2977 | ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? | |
2978 | &sk->sk_v6_daddr : NULL, | |
2979 | #ifdef CONFIG_IPV6_SUBTREES | |
2980 | ipv6_addr_equal(&fl6->saddr, &np->saddr) ? | |
2981 | &np->saddr : | |
2982 | #endif | |
2983 | NULL); | |
2984 | } | |
2985 | ||
9b6b35ab | 2986 | static bool ip6_redirect_nh_match(const struct fib6_result *res, |
0b34eb00 DA |
2987 | struct flowi6 *fl6, |
2988 | const struct in6_addr *gw, | |
2989 | struct rt6_info **ret) | |
2990 | { | |
9b6b35ab DA |
2991 | const struct fib6_nh *nh = res->nh; |
2992 | ||
0b34eb00 DA |
2993 | if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family || |
2994 | fl6->flowi6_oif != nh->fib_nh_dev->ifindex) | |
2995 | return false; | |
2996 | ||
2997 | /* rt_cache's gateway might be different from its 'parent' | |
2998 | * in the case of an ip redirect. | |
2999 | * So we keep searching in the exception table if the gateway | |
3000 | * is different. | |
3001 | */ | |
3002 | if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) { | |
3003 | struct rt6_info *rt_cache; | |
3004 | ||
9b6b35ab | 3005 | rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr); |
0b34eb00 DA |
3006 | if (rt_cache && |
3007 | ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) { | |
3008 | *ret = rt_cache; | |
3009 | return true; | |
3010 | } | |
3011 | return false; | |
3012 | } | |
3013 | return true; | |
3014 | } | |
3015 | ||
c55c8988 DA |
3016 | struct fib6_nh_rd_arg { |
3017 | struct fib6_result *res; | |
3018 | struct flowi6 *fl6; | |
3019 | const struct in6_addr *gw; | |
3020 | struct rt6_info **ret; | |
3021 | }; | |
3022 | ||
3023 | static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg) | |
3024 | { | |
3025 | struct fib6_nh_rd_arg *arg = _arg; | |
3026 | ||
3027 | arg->res->nh = nh; | |
3028 | return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret); | |
3029 | } | |
3030 | ||
b55b76b2 DJ |
3031 | /* Handle redirects */ |
3032 | struct ip6rd_flowi { | |
3033 | struct flowi6 fl6; | |
3034 | struct in6_addr gateway; | |
3035 | }; | |
3036 | ||
55cced4f | 3037 | INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net, |
b55b76b2 DJ |
3038 | struct fib6_table *table, |
3039 | struct flowi6 *fl6, | |
b75cc8f9 | 3040 | const struct sk_buff *skb, |
b55b76b2 DJ |
3041 | int flags) |
3042 | { | |
3043 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
0b34eb00 | 3044 | struct rt6_info *ret = NULL; |
9b6b35ab | 3045 | struct fib6_result res = {}; |
c55c8988 DA |
3046 | struct fib6_nh_rd_arg arg = { |
3047 | .res = &res, | |
3048 | .fl6 = fl6, | |
3049 | .gw = &rdfl->gateway, | |
3050 | .ret = &ret | |
3051 | }; | |
8d1c802b | 3052 | struct fib6_info *rt; |
b55b76b2 DJ |
3053 | struct fib6_node *fn; |
3054 | ||
3055 | /* Get the "current" route for this destination and | |
67c408cf | 3056 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
3057 | * |
3058 | * RFC 4861 specifies that redirects should only be | |
3059 | * accepted if they come from the nexthop to the target. | |
3060 | * Due to the way the routes are chosen, this notion | |
3061 | * is a bit fuzzy and one might need to check all possible | |
3062 | * routes. | |
3063 | */ | |
3064 | ||
66f5d6ce | 3065 | rcu_read_lock(); |
6454743b | 3066 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
b55b76b2 | 3067 | restart: |
66f5d6ce | 3068 | for_each_fib6_node_rt_rcu(fn) { |
9b6b35ab | 3069 | res.f6i = rt; |
14895687 | 3070 | if (fib6_check_expired(rt)) |
b55b76b2 | 3071 | continue; |
93c2fb25 | 3072 | if (rt->fib6_flags & RTF_REJECT) |
b55b76b2 | 3073 | break; |
c55c8988 DA |
3074 | if (unlikely(rt->nh)) { |
3075 | if (nexthop_is_blackhole(rt->nh)) | |
3076 | continue; | |
3077 | /* on match, res->nh is filled in and potentially ret */ | |
3078 | if (nexthop_for_each_fib6_nh(rt->nh, | |
3079 | fib6_nh_redirect_match, | |
3080 | &arg)) | |
3081 | goto out; | |
3082 | } else { | |
3083 | res.nh = rt->fib6_nh; | |
3084 | if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, | |
3085 | &ret)) | |
3086 | goto out; | |
3087 | } | |
b55b76b2 DJ |
3088 | } |
3089 | ||
3090 | if (!rt) | |
421842ed | 3091 | rt = net->ipv6.fib6_null_entry; |
93c2fb25 | 3092 | else if (rt->fib6_flags & RTF_REJECT) { |
23fb93a4 | 3093 | ret = net->ipv6.ip6_null_entry; |
b0a1ba59 MKL |
3094 | goto out; |
3095 | } | |
3096 | ||
421842ed | 3097 | if (rt == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
3098 | fn = fib6_backtrack(fn, &fl6->saddr); |
3099 | if (fn) | |
3100 | goto restart; | |
b55b76b2 | 3101 | } |
a3c00e46 | 3102 | |
9b6b35ab | 3103 | res.f6i = rt; |
1cf844c7 | 3104 | res.nh = rt->fib6_nh; |
b0a1ba59 | 3105 | out: |
7d21fec9 | 3106 | if (ret) { |
10585b43 | 3107 | ip6_hold_safe(net, &ret); |
7d21fec9 DA |
3108 | } else { |
3109 | res.fib6_flags = res.f6i->fib6_flags; | |
3110 | res.fib6_type = res.f6i->fib6_type; | |
9b6b35ab | 3111 | ret = ip6_create_rt_rcu(&res); |
7d21fec9 | 3112 | } |
b55b76b2 | 3113 | |
66f5d6ce | 3114 | rcu_read_unlock(); |
b55b76b2 | 3115 | |
8ff2e5b2 | 3116 | trace_fib6_table_lookup(net, &res, table, fl6); |
23fb93a4 | 3117 | return ret; |
b55b76b2 DJ |
3118 | }; |
3119 | ||
3120 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
b75cc8f9 DA |
3121 | const struct flowi6 *fl6, |
3122 | const struct sk_buff *skb, | |
3123 | const struct in6_addr *gateway) | |
b55b76b2 DJ |
3124 | { |
3125 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
3126 | struct ip6rd_flowi rdfl; | |
3127 | ||
3128 | rdfl.fl6 = *fl6; | |
3129 | rdfl.gateway = *gateway; | |
3130 | ||
b75cc8f9 | 3131 | return fib6_rule_lookup(net, &rdfl.fl6, skb, |
b55b76b2 DJ |
3132 | flags, __ip6_route_redirect); |
3133 | } | |
3134 | ||
e2d118a1 LC |
3135 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
3136 | kuid_t uid) | |
3a5ad2ee DM |
3137 | { |
3138 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
3139 | struct dst_entry *dst; | |
1f7f10ac MŻ |
3140 | struct flowi6 fl6 = { |
3141 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3142 | .flowi6_oif = oif, | |
3143 | .flowi6_mark = mark, | |
3144 | .daddr = iph->daddr, | |
3145 | .saddr = iph->saddr, | |
3146 | .flowlabel = ip6_flowinfo(iph), | |
3147 | .flowi6_uid = uid, | |
3148 | }; | |
3a5ad2ee | 3149 | |
b75cc8f9 | 3150 | dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr); |
b55b76b2 | 3151 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
3152 | dst_release(dst); |
3153 | } | |
3154 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
3155 | ||
d456336d | 3156 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif) |
c92a59ec DJ |
3157 | { |
3158 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
3159 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
3160 | struct dst_entry *dst; | |
0b26fb17 MŻ |
3161 | struct flowi6 fl6 = { |
3162 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3163 | .flowi6_oif = oif, | |
0b26fb17 MŻ |
3164 | .daddr = msg->dest, |
3165 | .saddr = iph->daddr, | |
3166 | .flowi6_uid = sock_net_uid(net, NULL), | |
3167 | }; | |
c92a59ec | 3168 | |
b75cc8f9 | 3169 | dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr); |
b55b76b2 | 3170 | rt6_do_redirect(dst, NULL, skb); |
c92a59ec DJ |
3171 | dst_release(dst); |
3172 | } | |
3173 | ||
3a5ad2ee DM |
3174 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
3175 | { | |
e2d118a1 LC |
3176 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
3177 | sk->sk_uid); | |
3a5ad2ee DM |
3178 | } |
3179 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
3180 | ||
0dbaee3b | 3181 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 3182 | { |
0dbaee3b DM |
3183 | struct net_device *dev = dst->dev; |
3184 | unsigned int mtu = dst_mtu(dst); | |
3185 | struct net *net = dev_net(dev); | |
3186 | ||
1da177e4 LT |
3187 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
3188 | ||
5578689a DL |
3189 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
3190 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
3191 | |
3192 | /* | |
1ab1457c YH |
3193 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
3194 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
3195 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
3196 | * rely only on pmtu discovery" |
3197 | */ | |
3198 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
3199 | mtu = IPV6_MAXPLEN; | |
3200 | return mtu; | |
3201 | } | |
3202 | ||
f67fbeae | 3203 | INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 3204 | { |
427faee1 | 3205 | return ip6_dst_mtu_maybe_forward(dst, false); |
d33e4553 | 3206 | } |
9c97921a | 3207 | EXPORT_INDIRECT_CALLABLE(ip6_mtu); |
d33e4553 | 3208 | |
901731b8 DA |
3209 | /* MTU selection: |
3210 | * 1. mtu on route is locked - use it | |
3211 | * 2. mtu from nexthop exception | |
3212 | * 3. mtu from egress device | |
3213 | * | |
3214 | * based on ip6_dst_mtu_forward and exception logic of | |
3215 | * rt6_find_cached_rt; called with rcu_read_lock | |
3216 | */ | |
b748f260 DA |
3217 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
3218 | const struct in6_addr *daddr, | |
3219 | const struct in6_addr *saddr) | |
901731b8 | 3220 | { |
b748f260 DA |
3221 | const struct fib6_nh *nh = res->nh; |
3222 | struct fib6_info *f6i = res->f6i; | |
901731b8 | 3223 | struct inet6_dev *idev; |
510e2ced | 3224 | struct rt6_info *rt; |
901731b8 DA |
3225 | u32 mtu = 0; |
3226 | ||
3227 | if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) { | |
3228 | mtu = f6i->fib6_pmtu; | |
3229 | if (mtu) | |
3230 | goto out; | |
3231 | } | |
3232 | ||
510e2ced WW |
3233 | rt = rt6_find_cached_rt(res, daddr, saddr); |
3234 | if (unlikely(rt)) { | |
3235 | mtu = dst_metric_raw(&rt->dst, RTAX_MTU); | |
3236 | } else { | |
b748f260 | 3237 | struct net_device *dev = nh->fib_nh_dev; |
901731b8 DA |
3238 | |
3239 | mtu = IPV6_MIN_MTU; | |
3240 | idev = __in6_dev_get(dev); | |
3241 | if (idev && idev->cnf.mtu6 > mtu) | |
3242 | mtu = idev->cnf.mtu6; | |
3243 | } | |
3244 | ||
3245 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); | |
3246 | out: | |
b748f260 | 3247 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
901731b8 DA |
3248 | } |
3249 | ||
3b00944c | 3250 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 3251 | struct flowi6 *fl6) |
1da177e4 | 3252 | { |
87a11578 | 3253 | struct dst_entry *dst; |
1da177e4 LT |
3254 | struct rt6_info *rt; |
3255 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 3256 | struct net *net = dev_net(dev); |
1da177e4 | 3257 | |
38308473 | 3258 | if (unlikely(!idev)) |
122bdf67 | 3259 | return ERR_PTR(-ENODEV); |
1da177e4 | 3260 | |
ad706862 | 3261 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 3262 | if (unlikely(!rt)) { |
1da177e4 | 3263 | in6_dev_put(idev); |
87a11578 | 3264 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
3265 | goto out; |
3266 | } | |
3267 | ||
588753f1 | 3268 | rt->dst.input = ip6_input; |
8e2ec639 | 3269 | rt->dst.output = ip6_output; |
550bab42 | 3270 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 3271 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
3272 | rt->rt6i_dst.plen = 128; |
3273 | rt->rt6i_idev = idev; | |
14edd87d | 3274 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 3275 | |
4c981e28 | 3276 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
3277 | * do proper release of the net_device |
3278 | */ | |
3279 | rt6_uncached_list_add(rt); | |
1da177e4 | 3280 | |
87a11578 DM |
3281 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
3282 | ||
1da177e4 | 3283 | out: |
87a11578 | 3284 | return dst; |
1da177e4 LT |
3285 | } |
3286 | ||
569d3645 | 3287 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 3288 | { |
86393e52 | 3289 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
3290 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
3291 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
3292 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3293 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3294 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
9cb7c013 | 3295 | unsigned int val; |
fc66f95c | 3296 | int entries; |
7019b78e | 3297 | |
fc66f95c | 3298 | entries = dst_entries_get_fast(ops); |
cf86a086 ED |
3299 | if (entries > rt_max_size) |
3300 | entries = dst_entries_get_slow(ops); | |
3301 | ||
49a18d86 | 3302 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 3303 | entries <= rt_max_size) |
1da177e4 LT |
3304 | goto out; |
3305 | ||
9cb7c013 | 3306 | fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true); |
fc66f95c ED |
3307 | entries = dst_entries_get_slow(ops); |
3308 | if (entries < ops->gc_thresh) | |
9cb7c013 | 3309 | atomic_set(&net->ipv6.ip6_rt_gc_expire, rt_gc_timeout >> 1); |
1da177e4 | 3310 | out: |
9cb7c013 ED |
3311 | val = atomic_read(&net->ipv6.ip6_rt_gc_expire); |
3312 | atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity)); | |
fc66f95c | 3313 | return entries > rt_max_size; |
1da177e4 LT |
3314 | } |
3315 | ||
b2c709cc DA |
3316 | static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg, |
3317 | const struct in6_addr *gw_addr, u32 tbid, | |
3318 | int flags, struct fib6_result *res) | |
8c14586f DA |
3319 | { |
3320 | struct flowi6 fl6 = { | |
3321 | .flowi6_oif = cfg->fc_ifindex, | |
3322 | .daddr = *gw_addr, | |
3323 | .saddr = cfg->fc_prefsrc, | |
3324 | }; | |
3325 | struct fib6_table *table; | |
b2c709cc | 3326 | int err; |
8c14586f | 3327 | |
f4797b33 | 3328 | table = fib6_get_table(net, tbid); |
8c14586f | 3329 | if (!table) |
b2c709cc | 3330 | return -EINVAL; |
8c14586f DA |
3331 | |
3332 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
3333 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3334 | ||
f4797b33 | 3335 | flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f | 3336 | |
b2c709cc DA |
3337 | err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags); |
3338 | if (!err && res->f6i != net->ipv6.fib6_null_entry) | |
3339 | fib6_select_path(net, res, &fl6, cfg->fc_ifindex, | |
3340 | cfg->fc_ifindex != 0, NULL, flags); | |
8c14586f | 3341 | |
b2c709cc | 3342 | return err; |
8c14586f DA |
3343 | } |
3344 | ||
fc1e64e1 DA |
3345 | static int ip6_route_check_nh_onlink(struct net *net, |
3346 | struct fib6_config *cfg, | |
9fbb704c | 3347 | const struct net_device *dev, |
fc1e64e1 DA |
3348 | struct netlink_ext_ack *extack) |
3349 | { | |
b2c709cc | 3350 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
fc1e64e1 | 3351 | const struct in6_addr *gw_addr = &cfg->fc_gateway; |
b2c709cc | 3352 | struct fib6_result res = {}; |
fc1e64e1 DA |
3353 | int err; |
3354 | ||
b2c709cc DA |
3355 | err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res); |
3356 | if (!err && !(res.fib6_flags & RTF_REJECT) && | |
3357 | /* ignore match if it is the default route */ | |
3358 | !ipv6_addr_any(&res.f6i->fib6_dst.addr) && | |
3359 | (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) { | |
3360 | NL_SET_ERR_MSG(extack, | |
3361 | "Nexthop has invalid gateway or device mismatch"); | |
3362 | err = -EINVAL; | |
fc1e64e1 DA |
3363 | } |
3364 | ||
3365 | return err; | |
3366 | } | |
3367 | ||
1edce99f DA |
3368 | static int ip6_route_check_nh(struct net *net, |
3369 | struct fib6_config *cfg, | |
3370 | struct net_device **_dev, | |
3371 | struct inet6_dev **idev) | |
3372 | { | |
3373 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3374 | struct net_device *dev = _dev ? *_dev : NULL; | |
b2c709cc DA |
3375 | int flags = RT6_LOOKUP_F_IFACE; |
3376 | struct fib6_result res = {}; | |
1edce99f DA |
3377 | int err = -EHOSTUNREACH; |
3378 | ||
3379 | if (cfg->fc_table) { | |
b2c709cc DA |
3380 | err = ip6_nh_lookup_table(net, cfg, gw_addr, |
3381 | cfg->fc_table, flags, &res); | |
3382 | /* gw_addr can not require a gateway or resolve to a reject | |
3383 | * route. If a device is given, it must match the result. | |
3384 | */ | |
3385 | if (err || res.fib6_flags & RTF_REJECT || | |
3386 | res.nh->fib_nh_gw_family || | |
3387 | (dev && dev != res.nh->fib_nh_dev)) | |
3388 | err = -EHOSTUNREACH; | |
1edce99f DA |
3389 | } |
3390 | ||
b2c709cc DA |
3391 | if (err < 0) { |
3392 | struct flowi6 fl6 = { | |
3393 | .flowi6_oif = cfg->fc_ifindex, | |
3394 | .daddr = *gw_addr, | |
3395 | }; | |
1edce99f | 3396 | |
b2c709cc DA |
3397 | err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags); |
3398 | if (err || res.fib6_flags & RTF_REJECT || | |
3399 | res.nh->fib_nh_gw_family) | |
3400 | err = -EHOSTUNREACH; | |
3401 | ||
3402 | if (err) | |
3403 | return err; | |
3404 | ||
3405 | fib6_select_path(net, &res, &fl6, cfg->fc_ifindex, | |
3406 | cfg->fc_ifindex != 0, NULL, flags); | |
3407 | } | |
1edce99f | 3408 | |
b2c709cc | 3409 | err = 0; |
1edce99f | 3410 | if (dev) { |
b2c709cc DA |
3411 | if (dev != res.nh->fib_nh_dev) |
3412 | err = -EHOSTUNREACH; | |
1edce99f | 3413 | } else { |
b2c709cc | 3414 | *_dev = dev = res.nh->fib_nh_dev; |
1edce99f | 3415 | dev_hold(dev); |
b2c709cc | 3416 | *idev = in6_dev_get(dev); |
1edce99f DA |
3417 | } |
3418 | ||
1edce99f DA |
3419 | return err; |
3420 | } | |
3421 | ||
9fbb704c DA |
3422 | static int ip6_validate_gw(struct net *net, struct fib6_config *cfg, |
3423 | struct net_device **_dev, struct inet6_dev **idev, | |
3424 | struct netlink_ext_ack *extack) | |
3425 | { | |
3426 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3427 | int gwa_type = ipv6_addr_type(gw_addr); | |
232378e8 | 3428 | bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true; |
9fbb704c | 3429 | const struct net_device *dev = *_dev; |
232378e8 | 3430 | bool need_addr_check = !dev; |
9fbb704c DA |
3431 | int err = -EINVAL; |
3432 | ||
3433 | /* if gw_addr is local we will fail to detect this in case | |
3434 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
3435 | * will return already-added prefix route via interface that | |
3436 | * prefix route was assigned to, which might be non-loopback. | |
3437 | */ | |
232378e8 DA |
3438 | if (dev && |
3439 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3440 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
9fbb704c DA |
3441 | goto out; |
3442 | } | |
3443 | ||
3444 | if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) { | |
3445 | /* IPv6 strictly inhibits using not link-local | |
3446 | * addresses as nexthop address. | |
3447 | * Otherwise, router will not able to send redirects. | |
3448 | * It is very good, but in some (rare!) circumstances | |
3449 | * (SIT, PtP, NBMA NOARP links) it is handy to allow | |
3450 | * some exceptions. --ANK | |
3451 | * We allow IPv4-mapped nexthops to support RFC4798-type | |
3452 | * addressing | |
3453 | */ | |
3454 | if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) { | |
3455 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
3456 | goto out; | |
3457 | } | |
3458 | ||
b2c709cc DA |
3459 | rcu_read_lock(); |
3460 | ||
9fbb704c DA |
3461 | if (cfg->fc_flags & RTNH_F_ONLINK) |
3462 | err = ip6_route_check_nh_onlink(net, cfg, dev, extack); | |
3463 | else | |
3464 | err = ip6_route_check_nh(net, cfg, _dev, idev); | |
3465 | ||
b2c709cc DA |
3466 | rcu_read_unlock(); |
3467 | ||
9fbb704c DA |
3468 | if (err) |
3469 | goto out; | |
3470 | } | |
3471 | ||
3472 | /* reload in case device was changed */ | |
3473 | dev = *_dev; | |
3474 | ||
3475 | err = -EINVAL; | |
3476 | if (!dev) { | |
3477 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
3478 | goto out; | |
3479 | } else if (dev->flags & IFF_LOOPBACK) { | |
3480 | NL_SET_ERR_MSG(extack, | |
3481 | "Egress device can not be loopback device for this route"); | |
3482 | goto out; | |
3483 | } | |
232378e8 DA |
3484 | |
3485 | /* if we did not check gw_addr above, do so now that the | |
3486 | * egress device has been resolved. | |
3487 | */ | |
3488 | if (need_addr_check && | |
3489 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3490 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
3491 | goto out; | |
3492 | } | |
3493 | ||
9fbb704c DA |
3494 | err = 0; |
3495 | out: | |
3496 | return err; | |
3497 | } | |
3498 | ||
83c44251 DA |
3499 | static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) |
3500 | { | |
3501 | if ((flags & RTF_REJECT) || | |
3502 | (dev && (dev->flags & IFF_LOOPBACK) && | |
3503 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
aea23c32 | 3504 | !(flags & (RTF_ANYCAST | RTF_LOCAL)))) |
83c44251 DA |
3505 | return true; |
3506 | ||
3507 | return false; | |
3508 | } | |
3509 | ||
3510 | int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, | |
3511 | struct fib6_config *cfg, gfp_t gfp_flags, | |
3512 | struct netlink_ext_ack *extack) | |
3513 | { | |
3514 | struct net_device *dev = NULL; | |
3515 | struct inet6_dev *idev = NULL; | |
3516 | int addr_type; | |
3517 | int err; | |
3518 | ||
f1741730 | 3519 | fib6_nh->fib_nh_family = AF_INET6; |
1bef4c22 ED |
3520 | #ifdef CONFIG_IPV6_ROUTER_PREF |
3521 | fib6_nh->last_probe = jiffies; | |
3522 | #endif | |
38428d68 RP |
3523 | if (cfg->fc_is_fdb) { |
3524 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; | |
3525 | fib6_nh->fib_nh_gw_family = AF_INET6; | |
3526 | return 0; | |
3527 | } | |
f1741730 | 3528 | |
83c44251 DA |
3529 | err = -ENODEV; |
3530 | if (cfg->fc_ifindex) { | |
3531 | dev = dev_get_by_index(net, cfg->fc_ifindex); | |
3532 | if (!dev) | |
3533 | goto out; | |
3534 | idev = in6_dev_get(dev); | |
3535 | if (!idev) | |
3536 | goto out; | |
3537 | } | |
3538 | ||
3539 | if (cfg->fc_flags & RTNH_F_ONLINK) { | |
3540 | if (!dev) { | |
3541 | NL_SET_ERR_MSG(extack, | |
3542 | "Nexthop device required for onlink"); | |
3543 | goto out; | |
3544 | } | |
3545 | ||
3546 | if (!(dev->flags & IFF_UP)) { | |
3547 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3548 | err = -ENETDOWN; | |
3549 | goto out; | |
3550 | } | |
3551 | ||
ad1601ae | 3552 | fib6_nh->fib_nh_flags |= RTNH_F_ONLINK; |
83c44251 DA |
3553 | } |
3554 | ||
ad1601ae | 3555 | fib6_nh->fib_nh_weight = 1; |
83c44251 DA |
3556 | |
3557 | /* We cannot add true routes via loopback here, | |
3558 | * they would result in kernel looping; promote them to reject routes | |
3559 | */ | |
3560 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3561 | if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) { | |
3562 | /* hold loopback dev/idev if we haven't done so. */ | |
3563 | if (dev != net->loopback_dev) { | |
3564 | if (dev) { | |
3565 | dev_put(dev); | |
3566 | in6_dev_put(idev); | |
3567 | } | |
3568 | dev = net->loopback_dev; | |
3569 | dev_hold(dev); | |
3570 | idev = in6_dev_get(dev); | |
3571 | if (!idev) { | |
3572 | err = -ENODEV; | |
3573 | goto out; | |
3574 | } | |
3575 | } | |
7dd73168 | 3576 | goto pcpu_alloc; |
83c44251 DA |
3577 | } |
3578 | ||
3579 | if (cfg->fc_flags & RTF_GATEWAY) { | |
3580 | err = ip6_validate_gw(net, cfg, &dev, &idev, extack); | |
3581 | if (err) | |
3582 | goto out; | |
3583 | ||
ad1601ae | 3584 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; |
bdf00467 | 3585 | fib6_nh->fib_nh_gw_family = AF_INET6; |
83c44251 DA |
3586 | } |
3587 | ||
3588 | err = -ENODEV; | |
3589 | if (!dev) | |
3590 | goto out; | |
3591 | ||
3592 | if (idev->cnf.disable_ipv6) { | |
3593 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device"); | |
3594 | err = -EACCES; | |
3595 | goto out; | |
3596 | } | |
3597 | ||
3598 | if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) { | |
3599 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3600 | err = -ENETDOWN; | |
3601 | goto out; | |
3602 | } | |
3603 | ||
3604 | if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) && | |
3605 | !netif_carrier_ok(dev)) | |
ad1601ae | 3606 | fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
83c44251 | 3607 | |
faee6769 | 3608 | err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap, |
7dd73168 DA |
3609 | cfg->fc_encap_type, cfg, gfp_flags, extack); |
3610 | if (err) | |
3611 | goto out; | |
3612 | ||
3613 | pcpu_alloc: | |
f40b6ae2 DA |
3614 | fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); |
3615 | if (!fib6_nh->rt6i_pcpu) { | |
3616 | err = -ENOMEM; | |
3617 | goto out; | |
3618 | } | |
3619 | ||
ad1601ae | 3620 | fib6_nh->fib_nh_dev = dev; |
e44b14eb ED |
3621 | netdev_tracker_alloc(dev, &fib6_nh->fib_nh_dev_tracker, gfp_flags); |
3622 | ||
f1741730 | 3623 | fib6_nh->fib_nh_oif = dev->ifindex; |
83c44251 DA |
3624 | err = 0; |
3625 | out: | |
3626 | if (idev) | |
3627 | in6_dev_put(idev); | |
3628 | ||
3629 | if (err) { | |
ad1601ae DA |
3630 | lwtstate_put(fib6_nh->fib_nh_lws); |
3631 | fib6_nh->fib_nh_lws = NULL; | |
1160dfa1 | 3632 | dev_put(dev); |
83c44251 DA |
3633 | } |
3634 | ||
3635 | return err; | |
3636 | } | |
3637 | ||
dac7d0f2 DA |
3638 | void fib6_nh_release(struct fib6_nh *fib6_nh) |
3639 | { | |
cc5c073a DA |
3640 | struct rt6_exception_bucket *bucket; |
3641 | ||
3642 | rcu_read_lock(); | |
3643 | ||
3644 | fib6_nh_flush_exceptions(fib6_nh, NULL); | |
3645 | bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL); | |
3646 | if (bucket) { | |
3647 | rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL); | |
3648 | kfree(bucket); | |
3649 | } | |
3650 | ||
3651 | rcu_read_unlock(); | |
3652 | ||
61308050 NA |
3653 | fib6_nh_release_dsts(fib6_nh); |
3654 | free_percpu(fib6_nh->rt6i_pcpu); | |
f40b6ae2 | 3655 | |
979e276e | 3656 | fib_nh_common_release(&fib6_nh->nh_common); |
dac7d0f2 DA |
3657 | } |
3658 | ||
8837cbbf NA |
3659 | void fib6_nh_release_dsts(struct fib6_nh *fib6_nh) |
3660 | { | |
3661 | int cpu; | |
3662 | ||
3663 | if (!fib6_nh->rt6i_pcpu) | |
3664 | return; | |
3665 | ||
3666 | for_each_possible_cpu(cpu) { | |
3667 | struct rt6_info *pcpu_rt, **ppcpu_rt; | |
3668 | ||
3669 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3670 | pcpu_rt = xchg(ppcpu_rt, NULL); | |
3671 | if (pcpu_rt) { | |
3672 | dst_dev_put(&pcpu_rt->dst); | |
3673 | dst_release(&pcpu_rt->dst); | |
3674 | } | |
3675 | } | |
3676 | } | |
3677 | ||
8d1c802b | 3678 | static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, |
acb54e3c | 3679 | gfp_t gfp_flags, |
333c4301 | 3680 | struct netlink_ext_ack *extack) |
1da177e4 | 3681 | { |
5578689a | 3682 | struct net *net = cfg->fc_nlinfo.nl_net; |
8d1c802b | 3683 | struct fib6_info *rt = NULL; |
f88d8ea6 | 3684 | struct nexthop *nh = NULL; |
c71099ac | 3685 | struct fib6_table *table; |
f88d8ea6 | 3686 | struct fib6_nh *fib6_nh; |
8c5b83f0 | 3687 | int err = -EINVAL; |
83c44251 | 3688 | int addr_type; |
1da177e4 | 3689 | |
557c44be | 3690 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
3691 | if (cfg->fc_flags & RTF_PCPU) { |
3692 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 3693 | goto out; |
d5d531cb | 3694 | } |
557c44be | 3695 | |
2ea2352e WW |
3696 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
3697 | if (cfg->fc_flags & RTF_CACHE) { | |
3698 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
3699 | goto out; | |
3700 | } | |
3701 | ||
e8478e80 DA |
3702 | if (cfg->fc_type > RTN_MAX) { |
3703 | NL_SET_ERR_MSG(extack, "Invalid route type"); | |
3704 | goto out; | |
3705 | } | |
3706 | ||
d5d531cb DA |
3707 | if (cfg->fc_dst_len > 128) { |
3708 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
3709 | goto out; | |
3710 | } | |
3711 | if (cfg->fc_src_len > 128) { | |
3712 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 3713 | goto out; |
d5d531cb | 3714 | } |
1da177e4 | 3715 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
3716 | if (cfg->fc_src_len) { |
3717 | NL_SET_ERR_MSG(extack, | |
3718 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 3719 | goto out; |
d5d531cb | 3720 | } |
1da177e4 | 3721 | #endif |
5b98324e DA |
3722 | if (cfg->fc_nh_id) { |
3723 | nh = nexthop_find_by_id(net, cfg->fc_nh_id); | |
3724 | if (!nh) { | |
3725 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
3726 | goto out; | |
3727 | } | |
3728 | err = fib6_check_nexthop(nh, cfg, extack); | |
3729 | if (err) | |
3730 | goto out; | |
3731 | } | |
fc1e64e1 | 3732 | |
d71314b4 | 3733 | err = -ENOBUFS; |
38308473 DM |
3734 | if (cfg->fc_nlinfo.nlh && |
3735 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 3736 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 3737 | if (!table) { |
f3213831 | 3738 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
3739 | table = fib6_new_table(net, cfg->fc_table); |
3740 | } | |
3741 | } else { | |
3742 | table = fib6_new_table(net, cfg->fc_table); | |
3743 | } | |
38308473 DM |
3744 | |
3745 | if (!table) | |
c71099ac | 3746 | goto out; |
c71099ac | 3747 | |
93531c67 | 3748 | err = -ENOMEM; |
f88d8ea6 | 3749 | rt = fib6_info_alloc(gfp_flags, !nh); |
93531c67 | 3750 | if (!rt) |
1da177e4 | 3751 | goto out; |
93531c67 | 3752 | |
d7e774f3 DA |
3753 | rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len, |
3754 | extack); | |
767a2217 DA |
3755 | if (IS_ERR(rt->fib6_metrics)) { |
3756 | err = PTR_ERR(rt->fib6_metrics); | |
fda21d46 ED |
3757 | /* Do not leave garbage there. */ |
3758 | rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; | |
8fb4792f | 3759 | goto out_free; |
767a2217 DA |
3760 | } |
3761 | ||
93531c67 DA |
3762 | if (cfg->fc_flags & RTF_ADDRCONF) |
3763 | rt->dst_nocount = true; | |
1da177e4 | 3764 | |
1716a961 | 3765 | if (cfg->fc_flags & RTF_EXPIRES) |
14895687 | 3766 | fib6_set_expires(rt, jiffies + |
1716a961 G |
3767 | clock_t_to_jiffies(cfg->fc_expires)); |
3768 | else | |
14895687 | 3769 | fib6_clean_expires(rt); |
1da177e4 | 3770 | |
86872cb5 TG |
3771 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
3772 | cfg->fc_protocol = RTPROT_BOOT; | |
93c2fb25 | 3773 | rt->fib6_protocol = cfg->fc_protocol; |
86872cb5 | 3774 | |
83c44251 DA |
3775 | rt->fib6_table = table; |
3776 | rt->fib6_metric = cfg->fc_metric; | |
c7036d97 | 3777 | rt->fib6_type = cfg->fc_type ? : RTN_UNICAST; |
2b2450ca | 3778 | rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; |
19e42e45 | 3779 | |
93c2fb25 DA |
3780 | ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
3781 | rt->fib6_dst.plen = cfg->fc_dst_len; | |
e5fd387a | 3782 | |
1da177e4 | 3783 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
3784 | ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len); |
3785 | rt->fib6_src.plen = cfg->fc_src_len; | |
1da177e4 | 3786 | #endif |
f88d8ea6 | 3787 | if (nh) { |
f88d8ea6 | 3788 | if (rt->fib6_src.plen) { |
4daa95af | 3789 | NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing"); |
821bbf79 | 3790 | goto out_free; |
f88d8ea6 | 3791 | } |
706ec919 XY |
3792 | if (!nexthop_get(nh)) { |
3793 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
821bbf79 | 3794 | goto out_free; |
706ec919 | 3795 | } |
f88d8ea6 DA |
3796 | rt->nh = nh; |
3797 | fib6_nh = nexthop_fib6_nh(rt->nh); | |
3798 | } else { | |
3799 | err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack); | |
3800 | if (err) | |
3801 | goto out; | |
1da177e4 | 3802 | |
f88d8ea6 DA |
3803 | fib6_nh = rt->fib6_nh; |
3804 | ||
3805 | /* We cannot add true routes via loopback here, they would | |
3806 | * result in kernel looping; promote them to reject routes | |
3807 | */ | |
3808 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3809 | if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev, | |
3810 | addr_type)) | |
3811 | rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP; | |
3812 | } | |
955ec4cb | 3813 | |
c3968a85 | 3814 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
f88d8ea6 | 3815 | struct net_device *dev = fib6_nh->fib_nh_dev; |
83c44251 | 3816 | |
c3968a85 | 3817 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
d5d531cb | 3818 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
3819 | err = -EINVAL; |
3820 | goto out; | |
3821 | } | |
93c2fb25 DA |
3822 | rt->fib6_prefsrc.addr = cfg->fc_prefsrc; |
3823 | rt->fib6_prefsrc.plen = 128; | |
c3968a85 | 3824 | } else |
93c2fb25 | 3825 | rt->fib6_prefsrc.plen = 0; |
c3968a85 | 3826 | |
8c5b83f0 | 3827 | return rt; |
6b9ea5a6 | 3828 | out: |
93531c67 | 3829 | fib6_info_release(rt); |
8c5b83f0 | 3830 | return ERR_PTR(err); |
821bbf79 CL |
3831 | out_free: |
3832 | ip_fib_metrics_put(rt->fib6_metrics); | |
3833 | kfree(rt); | |
3834 | return ERR_PTR(err); | |
6b9ea5a6 RP |
3835 | } |
3836 | ||
acb54e3c | 3837 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
333c4301 | 3838 | struct netlink_ext_ack *extack) |
6b9ea5a6 | 3839 | { |
8d1c802b | 3840 | struct fib6_info *rt; |
6b9ea5a6 RP |
3841 | int err; |
3842 | ||
acb54e3c | 3843 | rt = ip6_route_info_create(cfg, gfp_flags, extack); |
d4ead6b3 DA |
3844 | if (IS_ERR(rt)) |
3845 | return PTR_ERR(rt); | |
6b9ea5a6 | 3846 | |
d4ead6b3 | 3847 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack); |
93531c67 | 3848 | fib6_info_release(rt); |
6b9ea5a6 | 3849 | |
1da177e4 LT |
3850 | return err; |
3851 | } | |
3852 | ||
8d1c802b | 3853 | static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 3854 | { |
afb1d4b5 | 3855 | struct net *net = info->nl_net; |
c71099ac | 3856 | struct fib6_table *table; |
afb1d4b5 | 3857 | int err; |
1da177e4 | 3858 | |
421842ed | 3859 | if (rt == net->ipv6.fib6_null_entry) { |
6825a26c G |
3860 | err = -ENOENT; |
3861 | goto out; | |
3862 | } | |
6c813a72 | 3863 | |
93c2fb25 | 3864 | table = rt->fib6_table; |
66f5d6ce | 3865 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 3866 | err = fib6_del(rt, info); |
66f5d6ce | 3867 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 3868 | |
6825a26c | 3869 | out: |
93531c67 | 3870 | fib6_info_release(rt); |
1da177e4 LT |
3871 | return err; |
3872 | } | |
3873 | ||
11dd74b3 | 3874 | int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify) |
e0a1ad73 | 3875 | { |
11dd74b3 RP |
3876 | struct nl_info info = { |
3877 | .nl_net = net, | |
3878 | .skip_notify = skip_notify | |
3879 | }; | |
afb1d4b5 | 3880 | |
528c4ceb | 3881 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
3882 | } |
3883 | ||
8d1c802b | 3884 | static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg) |
0ae81335 DA |
3885 | { |
3886 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 3887 | struct net *net = info->nl_net; |
16a16cd3 | 3888 | struct sk_buff *skb = NULL; |
0ae81335 | 3889 | struct fib6_table *table; |
e3330039 | 3890 | int err = -ENOENT; |
0ae81335 | 3891 | |
421842ed | 3892 | if (rt == net->ipv6.fib6_null_entry) |
e3330039 | 3893 | goto out_put; |
93c2fb25 | 3894 | table = rt->fib6_table; |
66f5d6ce | 3895 | spin_lock_bh(&table->tb6_lock); |
0ae81335 | 3896 | |
93c2fb25 | 3897 | if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) { |
8d1c802b | 3898 | struct fib6_info *sibling, *next_sibling; |
0284696b | 3899 | struct fib6_node *fn; |
0ae81335 | 3900 | |
16a16cd3 DA |
3901 | /* prefer to send a single notification with all hops */ |
3902 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
3903 | if (skb) { | |
3904 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
3905 | ||
d4ead6b3 | 3906 | if (rt6_fill_node(net, skb, rt, NULL, |
16a16cd3 DA |
3907 | NULL, NULL, 0, RTM_DELROUTE, |
3908 | info->portid, seq, 0) < 0) { | |
3909 | kfree_skb(skb); | |
3910 | skb = NULL; | |
3911 | } else | |
3912 | info->skip_notify = 1; | |
3913 | } | |
3914 | ||
0284696b IS |
3915 | /* 'rt' points to the first sibling route. If it is not the |
3916 | * leaf, then we do not need to send a notification. Otherwise, | |
3917 | * we need to check if the last sibling has a next route or not | |
3918 | * and emit a replace or delete notification, respectively. | |
3919 | */ | |
2881fd61 | 3920 | info->skip_notify_kernel = 1; |
0284696b IS |
3921 | fn = rcu_dereference_protected(rt->fib6_node, |
3922 | lockdep_is_held(&table->tb6_lock)); | |
3923 | if (rcu_access_pointer(fn->leaf) == rt) { | |
3924 | struct fib6_info *last_sibling, *replace_rt; | |
3925 | ||
3926 | last_sibling = list_last_entry(&rt->fib6_siblings, | |
3927 | struct fib6_info, | |
3928 | fib6_siblings); | |
3929 | replace_rt = rcu_dereference_protected( | |
3930 | last_sibling->fib6_next, | |
3931 | lockdep_is_held(&table->tb6_lock)); | |
3932 | if (replace_rt) | |
3933 | call_fib6_entry_notifiers_replace(net, | |
3934 | replace_rt); | |
3935 | else | |
3936 | call_fib6_multipath_entry_notifiers(net, | |
caafb250 | 3937 | FIB_EVENT_ENTRY_DEL, |
0284696b IS |
3938 | rt, rt->fib6_nsiblings, |
3939 | NULL); | |
3940 | } | |
0ae81335 | 3941 | list_for_each_entry_safe(sibling, next_sibling, |
93c2fb25 DA |
3942 | &rt->fib6_siblings, |
3943 | fib6_siblings) { | |
0ae81335 DA |
3944 | err = fib6_del(sibling, info); |
3945 | if (err) | |
e3330039 | 3946 | goto out_unlock; |
0ae81335 DA |
3947 | } |
3948 | } | |
3949 | ||
3950 | err = fib6_del(rt, info); | |
e3330039 | 3951 | out_unlock: |
66f5d6ce | 3952 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 3953 | out_put: |
93531c67 | 3954 | fib6_info_release(rt); |
16a16cd3 DA |
3955 | |
3956 | if (skb) { | |
e3330039 | 3957 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
3958 | info->nlh, gfp_any()); |
3959 | } | |
0ae81335 DA |
3960 | return err; |
3961 | } | |
3962 | ||
0fa6efc5 | 3963 | static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg) |
23fb93a4 DA |
3964 | { |
3965 | int rc = -ESRCH; | |
3966 | ||
3967 | if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex) | |
3968 | goto out; | |
3969 | ||
3970 | if (cfg->fc_flags & RTF_GATEWAY && | |
3971 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
3972 | goto out; | |
761f6026 XL |
3973 | |
3974 | rc = rt6_remove_exception_rt(rt); | |
23fb93a4 DA |
3975 | out: |
3976 | return rc; | |
3977 | } | |
3978 | ||
0fa6efc5 DA |
3979 | static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt, |
3980 | struct fib6_nh *nh) | |
3981 | { | |
3982 | struct fib6_result res = { | |
3983 | .f6i = rt, | |
3984 | .nh = nh, | |
3985 | }; | |
3986 | struct rt6_info *rt_cache; | |
3987 | ||
3988 | rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src); | |
3989 | if (rt_cache) | |
3990 | return __ip6_del_cached_rt(rt_cache, cfg); | |
3991 | ||
3992 | return 0; | |
3993 | } | |
3994 | ||
5b98324e DA |
3995 | struct fib6_nh_del_cached_rt_arg { |
3996 | struct fib6_config *cfg; | |
3997 | struct fib6_info *f6i; | |
3998 | }; | |
3999 | ||
4000 | static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg) | |
4001 | { | |
4002 | struct fib6_nh_del_cached_rt_arg *arg = _arg; | |
4003 | int rc; | |
4004 | ||
4005 | rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh); | |
4006 | return rc != -ESRCH ? rc : 0; | |
4007 | } | |
4008 | ||
4009 | static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i) | |
4010 | { | |
4011 | struct fib6_nh_del_cached_rt_arg arg = { | |
4012 | .cfg = cfg, | |
4013 | .f6i = f6i | |
4014 | }; | |
4015 | ||
4016 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg); | |
4017 | } | |
4018 | ||
333c4301 DA |
4019 | static int ip6_route_del(struct fib6_config *cfg, |
4020 | struct netlink_ext_ack *extack) | |
1da177e4 | 4021 | { |
c71099ac | 4022 | struct fib6_table *table; |
8d1c802b | 4023 | struct fib6_info *rt; |
1da177e4 | 4024 | struct fib6_node *fn; |
1da177e4 LT |
4025 | int err = -ESRCH; |
4026 | ||
5578689a | 4027 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
4028 | if (!table) { |
4029 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 4030 | return err; |
d5d531cb | 4031 | } |
c71099ac | 4032 | |
66f5d6ce | 4033 | rcu_read_lock(); |
1da177e4 | 4034 | |
c71099ac | 4035 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 4036 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 4037 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 4038 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 4039 | |
1da177e4 | 4040 | if (fn) { |
66f5d6ce | 4041 | for_each_fib6_node_rt_rcu(fn) { |
ad1601ae DA |
4042 | struct fib6_nh *nh; |
4043 | ||
3401bfb1 SB |
4044 | if (rt->nh && cfg->fc_nh_id && |
4045 | rt->nh->id != cfg->fc_nh_id) | |
5b98324e | 4046 | continue; |
23fb93a4 | 4047 | |
5b98324e DA |
4048 | if (cfg->fc_flags & RTF_CACHE) { |
4049 | int rc = 0; | |
4050 | ||
4051 | if (rt->nh) { | |
4052 | rc = ip6_del_cached_rt_nh(cfg, rt); | |
4053 | } else if (cfg->fc_nh_id) { | |
4054 | continue; | |
4055 | } else { | |
4056 | nh = rt->fib6_nh; | |
4057 | rc = ip6_del_cached_rt(cfg, rt, nh); | |
4058 | } | |
0fa6efc5 DA |
4059 | if (rc != -ESRCH) { |
4060 | rcu_read_unlock(); | |
4061 | return rc; | |
23fb93a4 DA |
4062 | } |
4063 | continue; | |
2b760fcf | 4064 | } |
ad1601ae | 4065 | |
5b98324e DA |
4066 | if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric) |
4067 | continue; | |
4068 | if (cfg->fc_protocol && | |
4069 | cfg->fc_protocol != rt->fib6_protocol) | |
4070 | continue; | |
4071 | ||
4072 | if (rt->nh) { | |
4073 | if (!fib6_info_hold_safe(rt)) | |
4074 | continue; | |
4075 | rcu_read_unlock(); | |
4076 | ||
4077 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
4078 | } | |
4079 | if (cfg->fc_nh_id) | |
4080 | continue; | |
4081 | ||
4082 | nh = rt->fib6_nh; | |
86872cb5 | 4083 | if (cfg->fc_ifindex && |
ad1601ae DA |
4084 | (!nh->fib_nh_dev || |
4085 | nh->fib_nh_dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 4086 | continue; |
86872cb5 | 4087 | if (cfg->fc_flags & RTF_GATEWAY && |
ad1601ae | 4088 | !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6)) |
1da177e4 | 4089 | continue; |
e873e4b9 WW |
4090 | if (!fib6_info_hold_safe(rt)) |
4091 | continue; | |
66f5d6ce | 4092 | rcu_read_unlock(); |
1da177e4 | 4093 | |
0ae81335 DA |
4094 | /* if gateway was specified only delete the one hop */ |
4095 | if (cfg->fc_flags & RTF_GATEWAY) | |
4096 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
4097 | ||
4098 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
4099 | } |
4100 | } | |
66f5d6ce | 4101 | rcu_read_unlock(); |
1da177e4 LT |
4102 | |
4103 | return err; | |
4104 | } | |
4105 | ||
6700c270 | 4106 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 4107 | { |
a6279458 | 4108 | struct netevent_redirect netevent; |
e8599ff4 | 4109 | struct rt6_info *rt, *nrt = NULL; |
85bd05de | 4110 | struct fib6_result res = {}; |
e8599ff4 DM |
4111 | struct ndisc_options ndopts; |
4112 | struct inet6_dev *in6_dev; | |
4113 | struct neighbour *neigh; | |
71bcdba0 | 4114 | struct rd_msg *msg; |
6e157b6a DM |
4115 | int optlen, on_link; |
4116 | u8 *lladdr; | |
e8599ff4 | 4117 | |
29a3cad5 | 4118 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 4119 | optlen -= sizeof(*msg); |
e8599ff4 DM |
4120 | |
4121 | if (optlen < 0) { | |
6e157b6a | 4122 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
4123 | return; |
4124 | } | |
4125 | ||
71bcdba0 | 4126 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 4127 | |
71bcdba0 | 4128 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 4129 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
4130 | return; |
4131 | } | |
4132 | ||
6e157b6a | 4133 | on_link = 0; |
71bcdba0 | 4134 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 4135 | on_link = 1; |
71bcdba0 | 4136 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 4137 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 4138 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
4139 | return; |
4140 | } | |
4141 | ||
4142 | in6_dev = __in6_dev_get(skb->dev); | |
4143 | if (!in6_dev) | |
4144 | return; | |
4145 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
4146 | return; | |
4147 | ||
4148 | /* RFC2461 8.1: | |
4149 | * The IP source address of the Redirect MUST be the same as the current | |
4150 | * first-hop router for the specified ICMP Destination Address. | |
4151 | */ | |
4152 | ||
f997c55c | 4153 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
4154 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
4155 | return; | |
4156 | } | |
6e157b6a DM |
4157 | |
4158 | lladdr = NULL; | |
e8599ff4 DM |
4159 | if (ndopts.nd_opts_tgt_lladdr) { |
4160 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
4161 | skb->dev); | |
4162 | if (!lladdr) { | |
4163 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
4164 | return; | |
4165 | } | |
4166 | } | |
4167 | ||
6e157b6a | 4168 | rt = (struct rt6_info *) dst; |
ec13ad1d | 4169 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 4170 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 4171 | return; |
6e157b6a | 4172 | } |
e8599ff4 | 4173 | |
6e157b6a DM |
4174 | /* Redirect received -> path was valid. |
4175 | * Look, redirects are sent only in response to data packets, | |
4176 | * so that this nexthop apparently is reachable. --ANK | |
4177 | */ | |
0dec879f | 4178 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 4179 | |
71bcdba0 | 4180 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
4181 | if (!neigh) |
4182 | return; | |
a6279458 | 4183 | |
1da177e4 LT |
4184 | /* |
4185 | * We have finally decided to accept it. | |
4186 | */ | |
4187 | ||
f997c55c | 4188 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
4189 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
4190 | NEIGH_UPDATE_F_OVERRIDE| | |
4191 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
4192 | NEIGH_UPDATE_F_ISROUTER)), |
4193 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 4194 | |
4d85cd0c | 4195 | rcu_read_lock(); |
85bd05de | 4196 | res.f6i = rcu_dereference(rt->from); |
ff24e498 | 4197 | if (!res.f6i) |
886b7a50 | 4198 | goto out; |
8a14e46f | 4199 | |
49d5b8ef DA |
4200 | if (res.f6i->nh) { |
4201 | struct fib6_nh_match_arg arg = { | |
4202 | .dev = dst->dev, | |
4203 | .gw = &rt->rt6i_gateway, | |
4204 | }; | |
4205 | ||
4206 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
4207 | fib6_nh_find_match, &arg); | |
4208 | ||
4209 | /* fib6_info uses a nexthop that does not have fib6_nh | |
4210 | * using the dst->dev. Should be impossible | |
4211 | */ | |
4212 | if (!arg.match) | |
4213 | goto out; | |
4214 | res.nh = arg.match; | |
4215 | } else { | |
4216 | res.nh = res.f6i->fib6_nh; | |
4217 | } | |
4218 | ||
7d21fec9 DA |
4219 | res.fib6_flags = res.f6i->fib6_flags; |
4220 | res.fib6_type = res.f6i->fib6_type; | |
85bd05de | 4221 | nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); |
38308473 | 4222 | if (!nrt) |
1da177e4 LT |
4223 | goto out; |
4224 | ||
4225 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
4226 | if (on_link) | |
4227 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
4228 | ||
4e3fd7a0 | 4229 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 4230 | |
886b7a50 | 4231 | /* rt6_insert_exception() will take care of duplicated exceptions */ |
5012f0a5 | 4232 | if (rt6_insert_exception(nrt, &res)) { |
2b760fcf WW |
4233 | dst_release_immediate(&nrt->dst); |
4234 | goto out; | |
4235 | } | |
1da177e4 | 4236 | |
d8d1f30b CG |
4237 | netevent.old = &rt->dst; |
4238 | netevent.new = &nrt->dst; | |
71bcdba0 | 4239 | netevent.daddr = &msg->dest; |
60592833 | 4240 | netevent.neigh = neigh; |
8d71740c TT |
4241 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
4242 | ||
1da177e4 | 4243 | out: |
886b7a50 | 4244 | rcu_read_unlock(); |
e8599ff4 | 4245 | neigh_release(neigh); |
6e157b6a DM |
4246 | } |
4247 | ||
70ceb4f5 | 4248 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 4249 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 4250 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4251 | const struct in6_addr *gwaddr, |
4252 | struct net_device *dev) | |
70ceb4f5 | 4253 | { |
830218c1 DA |
4254 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4255 | int ifindex = dev->ifindex; | |
70ceb4f5 | 4256 | struct fib6_node *fn; |
8d1c802b | 4257 | struct fib6_info *rt = NULL; |
c71099ac TG |
4258 | struct fib6_table *table; |
4259 | ||
830218c1 | 4260 | table = fib6_get_table(net, tb_id); |
38308473 | 4261 | if (!table) |
c71099ac | 4262 | return NULL; |
70ceb4f5 | 4263 | |
66f5d6ce | 4264 | rcu_read_lock(); |
38fbeeee | 4265 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
4266 | if (!fn) |
4267 | goto out; | |
4268 | ||
66f5d6ce | 4269 | for_each_fib6_node_rt_rcu(fn) { |
f88d8ea6 DA |
4270 | /* these routes do not use nexthops */ |
4271 | if (rt->nh) | |
4272 | continue; | |
1cf844c7 | 4273 | if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex) |
70ceb4f5 | 4274 | continue; |
2b2450ca | 4275 | if (!(rt->fib6_flags & RTF_ROUTEINFO) || |
1cf844c7 | 4276 | !rt->fib6_nh->fib_nh_gw_family) |
70ceb4f5 | 4277 | continue; |
1cf844c7 | 4278 | if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr)) |
70ceb4f5 | 4279 | continue; |
e873e4b9 WW |
4280 | if (!fib6_info_hold_safe(rt)) |
4281 | continue; | |
70ceb4f5 YH |
4282 | break; |
4283 | } | |
4284 | out: | |
66f5d6ce | 4285 | rcu_read_unlock(); |
70ceb4f5 YH |
4286 | return rt; |
4287 | } | |
4288 | ||
8d1c802b | 4289 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 4290 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4291 | const struct in6_addr *gwaddr, |
4292 | struct net_device *dev, | |
95c96174 | 4293 | unsigned int pref) |
70ceb4f5 | 4294 | { |
86872cb5 | 4295 | struct fib6_config cfg = { |
238fc7ea | 4296 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 4297 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
4298 | .fc_dst_len = prefixlen, |
4299 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
4300 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 4301 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4302 | .fc_type = RTN_UNICAST, |
15e47304 | 4303 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
4304 | .fc_nlinfo.nlh = NULL, |
4305 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
4306 | }; |
4307 | ||
91b2c9a0 | 4308 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4e3fd7a0 AD |
4309 | cfg.fc_dst = *prefix; |
4310 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 4311 | |
e317da96 YH |
4312 | /* We should treat it as a default route if prefix length is 0. */ |
4313 | if (!prefixlen) | |
86872cb5 | 4314 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 4315 | |
acb54e3c | 4316 | ip6_route_add(&cfg, GFP_ATOMIC, NULL); |
70ceb4f5 | 4317 | |
830218c1 | 4318 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
4319 | } |
4320 | #endif | |
4321 | ||
8d1c802b | 4322 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 DA |
4323 | const struct in6_addr *addr, |
4324 | struct net_device *dev) | |
1ab1457c | 4325 | { |
830218c1 | 4326 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
8d1c802b | 4327 | struct fib6_info *rt; |
c71099ac | 4328 | struct fib6_table *table; |
1da177e4 | 4329 | |
afb1d4b5 | 4330 | table = fib6_get_table(net, tb_id); |
38308473 | 4331 | if (!table) |
c71099ac | 4332 | return NULL; |
1da177e4 | 4333 | |
66f5d6ce WW |
4334 | rcu_read_lock(); |
4335 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
f88d8ea6 | 4336 | struct fib6_nh *nh; |
ad1601ae | 4337 | |
f88d8ea6 DA |
4338 | /* RA routes do not use nexthops */ |
4339 | if (rt->nh) | |
4340 | continue; | |
4341 | ||
4342 | nh = rt->fib6_nh; | |
ad1601ae | 4343 | if (dev == nh->fib_nh_dev && |
93c2fb25 | 4344 | ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
ad1601ae | 4345 | ipv6_addr_equal(&nh->fib_nh_gw6, addr)) |
1da177e4 LT |
4346 | break; |
4347 | } | |
e873e4b9 WW |
4348 | if (rt && !fib6_info_hold_safe(rt)) |
4349 | rt = NULL; | |
66f5d6ce | 4350 | rcu_read_unlock(); |
1da177e4 LT |
4351 | return rt; |
4352 | } | |
4353 | ||
8d1c802b | 4354 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 4355 | const struct in6_addr *gwaddr, |
ebacaaa0 | 4356 | struct net_device *dev, |
6b2e04bc PC |
4357 | unsigned int pref, |
4358 | u32 defrtr_usr_metric) | |
1da177e4 | 4359 | { |
86872cb5 | 4360 | struct fib6_config cfg = { |
ca254490 | 4361 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
6b2e04bc | 4362 | .fc_metric = defrtr_usr_metric, |
86872cb5 TG |
4363 | .fc_ifindex = dev->ifindex, |
4364 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
4365 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 4366 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4367 | .fc_type = RTN_UNICAST, |
15e47304 | 4368 | .fc_nlinfo.portid = 0, |
5578689a | 4369 | .fc_nlinfo.nlh = NULL, |
afb1d4b5 | 4370 | .fc_nlinfo.nl_net = net, |
86872cb5 | 4371 | }; |
1da177e4 | 4372 | |
4e3fd7a0 | 4373 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 4374 | |
acb54e3c | 4375 | if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) { |
830218c1 DA |
4376 | struct fib6_table *table; |
4377 | ||
4378 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
4379 | if (table) | |
4380 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
4381 | } | |
1da177e4 | 4382 | |
afb1d4b5 | 4383 | return rt6_get_dflt_router(net, gwaddr, dev); |
1da177e4 LT |
4384 | } |
4385 | ||
afb1d4b5 DA |
4386 | static void __rt6_purge_dflt_routers(struct net *net, |
4387 | struct fib6_table *table) | |
1da177e4 | 4388 | { |
8d1c802b | 4389 | struct fib6_info *rt; |
1da177e4 LT |
4390 | |
4391 | restart: | |
66f5d6ce WW |
4392 | rcu_read_lock(); |
4393 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
dcd1f572 DA |
4394 | struct net_device *dev = fib6_info_nh_dev(rt); |
4395 | struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; | |
4396 | ||
93c2fb25 | 4397 | if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
e873e4b9 WW |
4398 | (!idev || idev->cnf.accept_ra != 2) && |
4399 | fib6_info_hold_safe(rt)) { | |
93531c67 | 4400 | rcu_read_unlock(); |
11dd74b3 | 4401 | ip6_del_rt(net, rt, false); |
1da177e4 LT |
4402 | goto restart; |
4403 | } | |
4404 | } | |
66f5d6ce | 4405 | rcu_read_unlock(); |
830218c1 DA |
4406 | |
4407 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
4408 | } | |
4409 | ||
4410 | void rt6_purge_dflt_routers(struct net *net) | |
4411 | { | |
4412 | struct fib6_table *table; | |
4413 | struct hlist_head *head; | |
4414 | unsigned int h; | |
4415 | ||
4416 | rcu_read_lock(); | |
4417 | ||
4418 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
4419 | head = &net->ipv6.fib_table_hash[h]; | |
4420 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
4421 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
afb1d4b5 | 4422 | __rt6_purge_dflt_routers(net, table); |
830218c1 DA |
4423 | } |
4424 | } | |
4425 | ||
4426 | rcu_read_unlock(); | |
1da177e4 LT |
4427 | } |
4428 | ||
5578689a DL |
4429 | static void rtmsg_to_fib6_config(struct net *net, |
4430 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
4431 | struct fib6_config *cfg) |
4432 | { | |
8823a3ac MŻ |
4433 | *cfg = (struct fib6_config){ |
4434 | .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? | |
4435 | : RT6_TABLE_MAIN, | |
4436 | .fc_ifindex = rtmsg->rtmsg_ifindex, | |
67f69513 | 4437 | .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER, |
8823a3ac MŻ |
4438 | .fc_expires = rtmsg->rtmsg_info, |
4439 | .fc_dst_len = rtmsg->rtmsg_dst_len, | |
4440 | .fc_src_len = rtmsg->rtmsg_src_len, | |
4441 | .fc_flags = rtmsg->rtmsg_flags, | |
4442 | .fc_type = rtmsg->rtmsg_type, | |
4443 | ||
4444 | .fc_nlinfo.nl_net = net, | |
4445 | ||
4446 | .fc_dst = rtmsg->rtmsg_dst, | |
4447 | .fc_src = rtmsg->rtmsg_src, | |
4448 | .fc_gateway = rtmsg->rtmsg_gateway, | |
4449 | }; | |
86872cb5 TG |
4450 | } |
4451 | ||
7c1552da | 4452 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg) |
1da177e4 | 4453 | { |
86872cb5 | 4454 | struct fib6_config cfg; |
1da177e4 LT |
4455 | int err; |
4456 | ||
7c1552da CH |
4457 | if (cmd != SIOCADDRT && cmd != SIOCDELRT) |
4458 | return -EINVAL; | |
4459 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
4460 | return -EPERM; | |
86872cb5 | 4461 | |
7c1552da | 4462 | rtmsg_to_fib6_config(net, rtmsg, &cfg); |
1da177e4 | 4463 | |
7c1552da CH |
4464 | rtnl_lock(); |
4465 | switch (cmd) { | |
4466 | case SIOCADDRT: | |
4467 | err = ip6_route_add(&cfg, GFP_KERNEL, NULL); | |
4468 | break; | |
4469 | case SIOCDELRT: | |
4470 | err = ip6_route_del(&cfg, NULL); | |
4471 | break; | |
3ff50b79 | 4472 | } |
7c1552da CH |
4473 | rtnl_unlock(); |
4474 | return err; | |
1da177e4 LT |
4475 | } |
4476 | ||
4477 | /* | |
4478 | * Drop the packet on the floor | |
4479 | */ | |
4480 | ||
d5fdd6ba | 4481 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 4482 | { |
adf30907 | 4483 | struct dst_entry *dst = skb_dst(skb); |
1d3fd8a1 SS |
4484 | struct net *net = dev_net(dst->dev); |
4485 | struct inet6_dev *idev; | |
3ae42cc8 | 4486 | SKB_DR(reason); |
1d3fd8a1 SS |
4487 | int type; |
4488 | ||
1158f79f | 4489 | if (netif_is_l3_master(skb->dev) || |
1d3fd8a1 SS |
4490 | dst->dev == net->loopback_dev) |
4491 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); | |
4492 | else | |
4493 | idev = ip6_dst_idev(dst); | |
4494 | ||
612f09e8 YH |
4495 | switch (ipstats_mib_noroutes) { |
4496 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 4497 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 4498 | if (type == IPV6_ADDR_ANY) { |
3ae42cc8 | 4499 | SKB_DR_SET(reason, IP_INADDRERRORS); |
1d3fd8a1 | 4500 | IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
612f09e8 YH |
4501 | break; |
4502 | } | |
3ae42cc8 | 4503 | SKB_DR_SET(reason, IP_INNOROUTES); |
a8eceea8 | 4504 | fallthrough; |
612f09e8 | 4505 | case IPSTATS_MIB_OUTNOROUTES: |
3ae42cc8 | 4506 | SKB_DR_OR(reason, IP_OUTNOROUTES); |
1d3fd8a1 | 4507 | IP6_INC_STATS(net, idev, ipstats_mib_noroutes); |
612f09e8 YH |
4508 | break; |
4509 | } | |
1d3fd8a1 SS |
4510 | |
4511 | /* Start over by dropping the dst for l3mdev case */ | |
4512 | if (netif_is_l3_master(skb->dev)) | |
4513 | skb_dst_drop(skb); | |
4514 | ||
3ffe533c | 4515 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
3ae42cc8 | 4516 | kfree_skb_reason(skb, reason); |
1da177e4 LT |
4517 | return 0; |
4518 | } | |
4519 | ||
9ce8ade0 TG |
4520 | static int ip6_pkt_discard(struct sk_buff *skb) |
4521 | { | |
612f09e8 | 4522 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4523 | } |
4524 | ||
ede2059d | 4525 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 4526 | { |
adf30907 | 4527 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4528 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
4529 | } |
4530 | ||
9ce8ade0 TG |
4531 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
4532 | { | |
612f09e8 | 4533 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4534 | } |
4535 | ||
ede2059d | 4536 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 4537 | { |
adf30907 | 4538 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4539 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
4540 | } |
4541 | ||
1da177e4 LT |
4542 | /* |
4543 | * Allocate a dst for local (unicast / anycast) address. | |
4544 | */ | |
4545 | ||
360a9887 DA |
4546 | struct fib6_info *addrconf_f6i_alloc(struct net *net, |
4547 | struct inet6_dev *idev, | |
4548 | const struct in6_addr *addr, | |
4549 | bool anycast, gfp_t gfp_flags) | |
1da177e4 | 4550 | { |
c7a1ce39 DA |
4551 | struct fib6_config cfg = { |
4552 | .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, | |
4553 | .fc_ifindex = idev->dev->ifindex, | |
d55a2e37 | 4554 | .fc_flags = RTF_UP | RTF_NONEXTHOP, |
c7a1ce39 DA |
4555 | .fc_dst = *addr, |
4556 | .fc_dst_len = 128, | |
4557 | .fc_protocol = RTPROT_KERNEL, | |
4558 | .fc_nlinfo.nl_net = net, | |
4559 | .fc_ignore_dev_down = true, | |
4560 | }; | |
d55a2e37 | 4561 | struct fib6_info *f6i; |
1da177e4 | 4562 | |
e8478e80 | 4563 | if (anycast) { |
c7a1ce39 DA |
4564 | cfg.fc_type = RTN_ANYCAST; |
4565 | cfg.fc_flags |= RTF_ANYCAST; | |
e8478e80 | 4566 | } else { |
c7a1ce39 DA |
4567 | cfg.fc_type = RTN_LOCAL; |
4568 | cfg.fc_flags |= RTF_LOCAL; | |
e8478e80 | 4569 | } |
1da177e4 | 4570 | |
d55a2e37 | 4571 | f6i = ip6_route_info_create(&cfg, gfp_flags, NULL); |
8652f17c | 4572 | if (!IS_ERR(f6i)) |
d55a2e37 MŻ |
4573 | f6i->dst_nocount = true; |
4574 | return f6i; | |
1da177e4 LT |
4575 | } |
4576 | ||
c3968a85 DW |
4577 | /* remove deleted ip from prefsrc entries */ |
4578 | struct arg_dev_net_ip { | |
4579 | struct net_device *dev; | |
4580 | struct net *net; | |
4581 | struct in6_addr *addr; | |
4582 | }; | |
4583 | ||
8d1c802b | 4584 | static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) |
c3968a85 DW |
4585 | { |
4586 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
4587 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
4588 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
4589 | ||
f88d8ea6 DA |
4590 | if (!rt->nh && |
4591 | ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) && | |
421842ed | 4592 | rt != net->ipv6.fib6_null_entry && |
93c2fb25 | 4593 | ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) { |
60006a48 | 4594 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 | 4595 | /* remove prefsrc entry */ |
93c2fb25 | 4596 | rt->fib6_prefsrc.plen = 0; |
60006a48 | 4597 | spin_unlock_bh(&rt6_exception_lock); |
c3968a85 DW |
4598 | } |
4599 | return 0; | |
4600 | } | |
4601 | ||
4602 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
4603 | { | |
4604 | struct net *net = dev_net(ifp->idev->dev); | |
4605 | struct arg_dev_net_ip adni = { | |
4606 | .dev = ifp->idev->dev, | |
4607 | .net = net, | |
4608 | .addr = &ifp->addr, | |
4609 | }; | |
0c3584d5 | 4610 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
4611 | } |
4612 | ||
2b2450ca | 4613 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) |
be7a010d DJ |
4614 | |
4615 | /* Remove routers and update dst entries when gateway turn into host. */ | |
8d1c802b | 4616 | static int fib6_clean_tohost(struct fib6_info *rt, void *arg) |
be7a010d DJ |
4617 | { |
4618 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
f88d8ea6 DA |
4619 | struct fib6_nh *nh; |
4620 | ||
4621 | /* RA routes do not use nexthops */ | |
4622 | if (rt->nh) | |
4623 | return 0; | |
be7a010d | 4624 | |
f88d8ea6 | 4625 | nh = rt->fib6_nh; |
93c2fb25 | 4626 | if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
cc5c073a | 4627 | nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6)) |
be7a010d | 4628 | return -1; |
b16cb459 WW |
4629 | |
4630 | /* Further clean up cached routes in exception table. | |
4631 | * This is needed because cached route may have a different | |
4632 | * gateway than its 'parent' in the case of an ip redirect. | |
4633 | */ | |
cc5c073a | 4634 | fib6_nh_exceptions_clean_tohost(nh, gateway); |
b16cb459 | 4635 | |
be7a010d DJ |
4636 | return 0; |
4637 | } | |
4638 | ||
4639 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
4640 | { | |
4641 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
4642 | } | |
4643 | ||
2127d95a IS |
4644 | struct arg_netdev_event { |
4645 | const struct net_device *dev; | |
4c981e28 | 4646 | union { |
ecc5663c | 4647 | unsigned char nh_flags; |
4c981e28 IS |
4648 | unsigned long event; |
4649 | }; | |
2127d95a IS |
4650 | }; |
4651 | ||
8d1c802b | 4652 | static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt) |
d7dedee1 | 4653 | { |
8d1c802b | 4654 | struct fib6_info *iter; |
d7dedee1 IS |
4655 | struct fib6_node *fn; |
4656 | ||
93c2fb25 DA |
4657 | fn = rcu_dereference_protected(rt->fib6_node, |
4658 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
d7dedee1 | 4659 | iter = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 4660 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 | 4661 | while (iter) { |
93c2fb25 | 4662 | if (iter->fib6_metric == rt->fib6_metric && |
33bd5ac5 | 4663 | rt6_qualify_for_ecmp(iter)) |
d7dedee1 | 4664 | return iter; |
8fb11a9a | 4665 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 4666 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 IS |
4667 | } |
4668 | ||
4669 | return NULL; | |
4670 | } | |
4671 | ||
f88d8ea6 | 4672 | /* only called for fib entries with builtin fib6_nh */ |
8d1c802b | 4673 | static bool rt6_is_dead(const struct fib6_info *rt) |
d7dedee1 | 4674 | { |
1cf844c7 DA |
4675 | if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD || |
4676 | (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
4677 | ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev))) | |
d7dedee1 IS |
4678 | return true; |
4679 | ||
4680 | return false; | |
4681 | } | |
4682 | ||
8d1c802b | 4683 | static int rt6_multipath_total_weight(const struct fib6_info *rt) |
d7dedee1 | 4684 | { |
8d1c802b | 4685 | struct fib6_info *iter; |
d7dedee1 IS |
4686 | int total = 0; |
4687 | ||
4688 | if (!rt6_is_dead(rt)) | |
1cf844c7 | 4689 | total += rt->fib6_nh->fib_nh_weight; |
d7dedee1 | 4690 | |
93c2fb25 | 4691 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { |
d7dedee1 | 4692 | if (!rt6_is_dead(iter)) |
1cf844c7 | 4693 | total += iter->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4694 | } |
4695 | ||
4696 | return total; | |
4697 | } | |
4698 | ||
8d1c802b | 4699 | static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total) |
d7dedee1 IS |
4700 | { |
4701 | int upper_bound = -1; | |
4702 | ||
4703 | if (!rt6_is_dead(rt)) { | |
1cf844c7 | 4704 | *weight += rt->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4705 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, |
4706 | total) - 1; | |
4707 | } | |
1cf844c7 | 4708 | atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound); |
d7dedee1 IS |
4709 | } |
4710 | ||
8d1c802b | 4711 | static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total) |
d7dedee1 | 4712 | { |
8d1c802b | 4713 | struct fib6_info *iter; |
d7dedee1 IS |
4714 | int weight = 0; |
4715 | ||
4716 | rt6_upper_bound_set(rt, &weight, total); | |
4717 | ||
93c2fb25 | 4718 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
d7dedee1 IS |
4719 | rt6_upper_bound_set(iter, &weight, total); |
4720 | } | |
4721 | ||
8d1c802b | 4722 | void rt6_multipath_rebalance(struct fib6_info *rt) |
d7dedee1 | 4723 | { |
8d1c802b | 4724 | struct fib6_info *first; |
d7dedee1 IS |
4725 | int total; |
4726 | ||
4727 | /* In case the entire multipath route was marked for flushing, | |
4728 | * then there is no need to rebalance upon the removal of every | |
4729 | * sibling route. | |
4730 | */ | |
93c2fb25 | 4731 | if (!rt->fib6_nsiblings || rt->should_flush) |
d7dedee1 IS |
4732 | return; |
4733 | ||
4734 | /* During lookup routes are evaluated in order, so we need to | |
4735 | * make sure upper bounds are assigned from the first sibling | |
4736 | * onwards. | |
4737 | */ | |
4738 | first = rt6_multipath_first_sibling(rt); | |
4739 | if (WARN_ON_ONCE(!first)) | |
4740 | return; | |
4741 | ||
4742 | total = rt6_multipath_total_weight(first); | |
4743 | rt6_multipath_upper_bound_set(first, total); | |
4744 | } | |
4745 | ||
8d1c802b | 4746 | static int fib6_ifup(struct fib6_info *rt, void *p_arg) |
2127d95a IS |
4747 | { |
4748 | const struct arg_netdev_event *arg = p_arg; | |
7aef6859 | 4749 | struct net *net = dev_net(arg->dev); |
2127d95a | 4750 | |
f88d8ea6 | 4751 | if (rt != net->ipv6.fib6_null_entry && !rt->nh && |
1cf844c7 DA |
4752 | rt->fib6_nh->fib_nh_dev == arg->dev) { |
4753 | rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags; | |
7aef6859 | 4754 | fib6_update_sernum_upto_root(net, rt); |
d7dedee1 | 4755 | rt6_multipath_rebalance(rt); |
1de178ed | 4756 | } |
2127d95a IS |
4757 | |
4758 | return 0; | |
4759 | } | |
4760 | ||
ecc5663c | 4761 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags) |
2127d95a IS |
4762 | { |
4763 | struct arg_netdev_event arg = { | |
4764 | .dev = dev, | |
6802f3ad IS |
4765 | { |
4766 | .nh_flags = nh_flags, | |
4767 | }, | |
2127d95a IS |
4768 | }; |
4769 | ||
4770 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
4771 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
4772 | ||
4773 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
4774 | } | |
4775 | ||
f88d8ea6 | 4776 | /* only called for fib entries with inline fib6_nh */ |
8d1c802b | 4777 | static bool rt6_multipath_uses_dev(const struct fib6_info *rt, |
1de178ed IS |
4778 | const struct net_device *dev) |
4779 | { | |
8d1c802b | 4780 | struct fib6_info *iter; |
1de178ed | 4781 | |
1cf844c7 | 4782 | if (rt->fib6_nh->fib_nh_dev == dev) |
1de178ed | 4783 | return true; |
93c2fb25 | 4784 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 | 4785 | if (iter->fib6_nh->fib_nh_dev == dev) |
1de178ed IS |
4786 | return true; |
4787 | ||
4788 | return false; | |
4789 | } | |
4790 | ||
8d1c802b | 4791 | static void rt6_multipath_flush(struct fib6_info *rt) |
1de178ed | 4792 | { |
8d1c802b | 4793 | struct fib6_info *iter; |
1de178ed IS |
4794 | |
4795 | rt->should_flush = 1; | |
93c2fb25 | 4796 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1de178ed IS |
4797 | iter->should_flush = 1; |
4798 | } | |
4799 | ||
8d1c802b | 4800 | static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt, |
1de178ed IS |
4801 | const struct net_device *down_dev) |
4802 | { | |
8d1c802b | 4803 | struct fib6_info *iter; |
1de178ed IS |
4804 | unsigned int dead = 0; |
4805 | ||
1cf844c7 DA |
4806 | if (rt->fib6_nh->fib_nh_dev == down_dev || |
4807 | rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed | 4808 | dead++; |
93c2fb25 | 4809 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4810 | if (iter->fib6_nh->fib_nh_dev == down_dev || |
4811 | iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed IS |
4812 | dead++; |
4813 | ||
4814 | return dead; | |
4815 | } | |
4816 | ||
8d1c802b | 4817 | static void rt6_multipath_nh_flags_set(struct fib6_info *rt, |
1de178ed | 4818 | const struct net_device *dev, |
ecc5663c | 4819 | unsigned char nh_flags) |
1de178ed | 4820 | { |
8d1c802b | 4821 | struct fib6_info *iter; |
1de178ed | 4822 | |
1cf844c7 DA |
4823 | if (rt->fib6_nh->fib_nh_dev == dev) |
4824 | rt->fib6_nh->fib_nh_flags |= nh_flags; | |
93c2fb25 | 4825 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4826 | if (iter->fib6_nh->fib_nh_dev == dev) |
4827 | iter->fib6_nh->fib_nh_flags |= nh_flags; | |
1de178ed IS |
4828 | } |
4829 | ||
a1a22c12 | 4830 | /* called with write lock held for table with rt */ |
8d1c802b | 4831 | static int fib6_ifdown(struct fib6_info *rt, void *p_arg) |
1da177e4 | 4832 | { |
4c981e28 IS |
4833 | const struct arg_netdev_event *arg = p_arg; |
4834 | const struct net_device *dev = arg->dev; | |
7aef6859 | 4835 | struct net *net = dev_net(dev); |
8ed67789 | 4836 | |
f88d8ea6 | 4837 | if (rt == net->ipv6.fib6_null_entry || rt->nh) |
27c6fa73 IS |
4838 | return 0; |
4839 | ||
4840 | switch (arg->event) { | |
4841 | case NETDEV_UNREGISTER: | |
1cf844c7 | 4842 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
27c6fa73 | 4843 | case NETDEV_DOWN: |
1de178ed | 4844 | if (rt->should_flush) |
27c6fa73 | 4845 | return -1; |
93c2fb25 | 4846 | if (!rt->fib6_nsiblings) |
1cf844c7 | 4847 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
1de178ed IS |
4848 | if (rt6_multipath_uses_dev(rt, dev)) { |
4849 | unsigned int count; | |
4850 | ||
4851 | count = rt6_multipath_dead_count(rt, dev); | |
93c2fb25 | 4852 | if (rt->fib6_nsiblings + 1 == count) { |
1de178ed IS |
4853 | rt6_multipath_flush(rt); |
4854 | return -1; | |
4855 | } | |
4856 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
4857 | RTNH_F_LINKDOWN); | |
7aef6859 | 4858 | fib6_update_sernum(net, rt); |
d7dedee1 | 4859 | rt6_multipath_rebalance(rt); |
1de178ed IS |
4860 | } |
4861 | return -2; | |
27c6fa73 | 4862 | case NETDEV_CHANGE: |
1cf844c7 | 4863 | if (rt->fib6_nh->fib_nh_dev != dev || |
93c2fb25 | 4864 | rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) |
27c6fa73 | 4865 | break; |
1cf844c7 | 4866 | rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
d7dedee1 | 4867 | rt6_multipath_rebalance(rt); |
27c6fa73 | 4868 | break; |
2b241361 | 4869 | } |
c159d30c | 4870 | |
1da177e4 LT |
4871 | return 0; |
4872 | } | |
4873 | ||
27c6fa73 | 4874 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 4875 | { |
4c981e28 | 4876 | struct arg_netdev_event arg = { |
8ed67789 | 4877 | .dev = dev, |
6802f3ad IS |
4878 | { |
4879 | .event = event, | |
4880 | }, | |
8ed67789 | 4881 | }; |
7c6bb7d2 | 4882 | struct net *net = dev_net(dev); |
8ed67789 | 4883 | |
7c6bb7d2 DA |
4884 | if (net->ipv6.sysctl.skip_notify_on_dev_down) |
4885 | fib6_clean_all_skip_notify(net, fib6_ifdown, &arg); | |
4886 | else | |
4887 | fib6_clean_all(net, fib6_ifdown, &arg); | |
4c981e28 IS |
4888 | } |
4889 | ||
4890 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
4891 | { | |
4892 | rt6_sync_down_dev(dev, event); | |
e5f80fcf | 4893 | rt6_uncached_list_flush_dev(dev); |
4c981e28 | 4894 | neigh_ifdown(&nd_tbl, dev); |
1da177e4 LT |
4895 | } |
4896 | ||
95c96174 | 4897 | struct rt6_mtu_change_arg { |
1da177e4 | 4898 | struct net_device *dev; |
95c96174 | 4899 | unsigned int mtu; |
c0b220cf | 4900 | struct fib6_info *f6i; |
1da177e4 LT |
4901 | }; |
4902 | ||
cc5c073a | 4903 | static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg) |
c0b220cf DA |
4904 | { |
4905 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg; | |
cc5c073a | 4906 | struct fib6_info *f6i = arg->f6i; |
c0b220cf DA |
4907 | |
4908 | /* For administrative MTU increase, there is no way to discover | |
4909 | * IPv6 PMTU increase, so PMTU increase should be updated here. | |
4910 | * Since RFC 1981 doesn't include administrative MTU increase | |
4911 | * update PMTU increase is a MUST. (i.e. jumbo frame) | |
4912 | */ | |
4913 | if (nh->fib_nh_dev == arg->dev) { | |
4914 | struct inet6_dev *idev = __in6_dev_get(arg->dev); | |
4915 | u32 mtu = f6i->fib6_pmtu; | |
4916 | ||
4917 | if (mtu >= arg->mtu || | |
4918 | (mtu < arg->mtu && mtu == idev->cnf.mtu6)) | |
4919 | fib6_metric_set(f6i, RTAX_MTU, arg->mtu); | |
4920 | ||
4921 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 4922 | rt6_exceptions_update_pmtu(idev, nh, arg->mtu); |
c0b220cf DA |
4923 | spin_unlock_bh(&rt6_exception_lock); |
4924 | } | |
4925 | ||
4926 | return 0; | |
4927 | } | |
4928 | ||
4929 | static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg) | |
1da177e4 LT |
4930 | { |
4931 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
4932 | struct inet6_dev *idev; | |
4933 | ||
4934 | /* In IPv6 pmtu discovery is not optional, | |
4935 | so that RTAX_MTU lock cannot disable it. | |
4936 | We still use this lock to block changes | |
4937 | caused by addrconf/ndisc. | |
4938 | */ | |
4939 | ||
4940 | idev = __in6_dev_get(arg->dev); | |
38308473 | 4941 | if (!idev) |
1da177e4 LT |
4942 | return 0; |
4943 | ||
c0b220cf DA |
4944 | if (fib6_metric_locked(f6i, RTAX_MTU)) |
4945 | return 0; | |
d4ead6b3 | 4946 | |
c0b220cf | 4947 | arg->f6i = f6i; |
2d44234b DA |
4948 | if (f6i->nh) { |
4949 | /* fib6_nh_mtu_change only returns 0, so this is safe */ | |
4950 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change, | |
4951 | arg); | |
4952 | } | |
4953 | ||
1cf844c7 | 4954 | return fib6_nh_mtu_change(f6i->fib6_nh, arg); |
1da177e4 LT |
4955 | } |
4956 | ||
95c96174 | 4957 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 4958 | { |
c71099ac TG |
4959 | struct rt6_mtu_change_arg arg = { |
4960 | .dev = dev, | |
4961 | .mtu = mtu, | |
4962 | }; | |
1da177e4 | 4963 | |
0c3584d5 | 4964 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
4965 | } |
4966 | ||
ef7c79ed | 4967 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
75425657 | 4968 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
5176f91e | 4969 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
aa8f8778 | 4970 | [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 4971 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 4972 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
4973 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
4974 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 4975 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 4976 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
4977 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
4978 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 4979 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 4980 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 4981 | [RTA_MARK] = { .type = NLA_U32 }, |
aa8f8778 | 4982 | [RTA_TABLE] = { .type = NLA_U32 }, |
eacb9384 RP |
4983 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
4984 | [RTA_SPORT] = { .type = NLA_U16 }, | |
4985 | [RTA_DPORT] = { .type = NLA_U16 }, | |
5b98324e | 4986 | [RTA_NH_ID] = { .type = NLA_U32 }, |
86872cb5 TG |
4987 | }; |
4988 | ||
4989 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
4990 | struct fib6_config *cfg, |
4991 | struct netlink_ext_ack *extack) | |
1da177e4 | 4992 | { |
86872cb5 TG |
4993 | struct rtmsg *rtm; |
4994 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 4995 | unsigned int pref; |
86872cb5 | 4996 | int err; |
1da177e4 | 4997 | |
8cb08174 JB |
4998 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
4999 | rtm_ipv6_policy, extack); | |
86872cb5 TG |
5000 | if (err < 0) |
5001 | goto errout; | |
1da177e4 | 5002 | |
86872cb5 TG |
5003 | err = -EINVAL; |
5004 | rtm = nlmsg_data(nlh); | |
86872cb5 | 5005 | |
b9605161 GN |
5006 | if (rtm->rtm_tos) { |
5007 | NL_SET_ERR_MSG(extack, | |
5008 | "Invalid dsfield (tos): option not available for IPv6"); | |
5009 | goto errout; | |
5010 | } | |
5011 | ||
84db8407 MŻ |
5012 | *cfg = (struct fib6_config){ |
5013 | .fc_table = rtm->rtm_table, | |
5014 | .fc_dst_len = rtm->rtm_dst_len, | |
5015 | .fc_src_len = rtm->rtm_src_len, | |
5016 | .fc_flags = RTF_UP, | |
5017 | .fc_protocol = rtm->rtm_protocol, | |
5018 | .fc_type = rtm->rtm_type, | |
5019 | ||
5020 | .fc_nlinfo.portid = NETLINK_CB(skb).portid, | |
5021 | .fc_nlinfo.nlh = nlh, | |
5022 | .fc_nlinfo.nl_net = sock_net(skb->sk), | |
5023 | }; | |
86872cb5 | 5024 | |
ef2c7d7b ND |
5025 | if (rtm->rtm_type == RTN_UNREACHABLE || |
5026 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
5027 | rtm->rtm_type == RTN_PROHIBIT || |
5028 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
5029 | cfg->fc_flags |= RTF_REJECT; |
5030 | ||
ab79ad14 MŻ |
5031 | if (rtm->rtm_type == RTN_LOCAL) |
5032 | cfg->fc_flags |= RTF_LOCAL; | |
5033 | ||
1f56a01f MKL |
5034 | if (rtm->rtm_flags & RTM_F_CLONED) |
5035 | cfg->fc_flags |= RTF_CACHE; | |
5036 | ||
fc1e64e1 DA |
5037 | cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK); |
5038 | ||
5b98324e DA |
5039 | if (tb[RTA_NH_ID]) { |
5040 | if (tb[RTA_GATEWAY] || tb[RTA_OIF] || | |
5041 | tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) { | |
5042 | NL_SET_ERR_MSG(extack, | |
5043 | "Nexthop specification and nexthop id are mutually exclusive"); | |
5044 | goto errout; | |
5045 | } | |
5046 | cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]); | |
5047 | } | |
5048 | ||
86872cb5 | 5049 | if (tb[RTA_GATEWAY]) { |
67b61f6c | 5050 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 5051 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 5052 | } |
e3818541 DA |
5053 | if (tb[RTA_VIA]) { |
5054 | NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute"); | |
5055 | goto errout; | |
5056 | } | |
86872cb5 TG |
5057 | |
5058 | if (tb[RTA_DST]) { | |
5059 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
5060 | ||
5061 | if (nla_len(tb[RTA_DST]) < plen) | |
5062 | goto errout; | |
5063 | ||
5064 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 5065 | } |
86872cb5 TG |
5066 | |
5067 | if (tb[RTA_SRC]) { | |
5068 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
5069 | ||
5070 | if (nla_len(tb[RTA_SRC]) < plen) | |
5071 | goto errout; | |
5072 | ||
5073 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 5074 | } |
86872cb5 | 5075 | |
c3968a85 | 5076 | if (tb[RTA_PREFSRC]) |
67b61f6c | 5077 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 5078 | |
86872cb5 TG |
5079 | if (tb[RTA_OIF]) |
5080 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
5081 | ||
5082 | if (tb[RTA_PRIORITY]) | |
5083 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
5084 | ||
5085 | if (tb[RTA_METRICS]) { | |
5086 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
5087 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 5088 | } |
86872cb5 TG |
5089 | |
5090 | if (tb[RTA_TABLE]) | |
5091 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
5092 | ||
51ebd318 ND |
5093 | if (tb[RTA_MULTIPATH]) { |
5094 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
5095 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
5096 | |
5097 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 5098 | cfg->fc_mp_len, extack); |
9ed59592 DA |
5099 | if (err < 0) |
5100 | goto errout; | |
51ebd318 ND |
5101 | } |
5102 | ||
c78ba6d6 LR |
5103 | if (tb[RTA_PREF]) { |
5104 | pref = nla_get_u8(tb[RTA_PREF]); | |
5105 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
5106 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
5107 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
5108 | cfg->fc_flags |= RTF_PREF(pref); | |
5109 | } | |
5110 | ||
19e42e45 RP |
5111 | if (tb[RTA_ENCAP]) |
5112 | cfg->fc_encap = tb[RTA_ENCAP]; | |
5113 | ||
9ed59592 | 5114 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
5115 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
5116 | ||
c255bd68 | 5117 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
5118 | if (err < 0) |
5119 | goto errout; | |
5120 | } | |
5121 | ||
32bc201e XL |
5122 | if (tb[RTA_EXPIRES]) { |
5123 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
5124 | ||
5125 | if (addrconf_finite_timeout(timeout)) { | |
5126 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
5127 | cfg->fc_flags |= RTF_EXPIRES; | |
5128 | } | |
5129 | } | |
5130 | ||
86872cb5 TG |
5131 | err = 0; |
5132 | errout: | |
5133 | return err; | |
1da177e4 LT |
5134 | } |
5135 | ||
6b9ea5a6 | 5136 | struct rt6_nh { |
8d1c802b | 5137 | struct fib6_info *fib6_info; |
6b9ea5a6 | 5138 | struct fib6_config r_cfg; |
6b9ea5a6 RP |
5139 | struct list_head next; |
5140 | }; | |
5141 | ||
d4ead6b3 DA |
5142 | static int ip6_route_info_append(struct net *net, |
5143 | struct list_head *rt6_nh_list, | |
8d1c802b DA |
5144 | struct fib6_info *rt, |
5145 | struct fib6_config *r_cfg) | |
6b9ea5a6 RP |
5146 | { |
5147 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
5148 | int err = -EEXIST; |
5149 | ||
5150 | list_for_each_entry(nh, rt6_nh_list, next) { | |
8d1c802b DA |
5151 | /* check if fib6_info already exists */ |
5152 | if (rt6_duplicate_nexthop(nh->fib6_info, rt)) | |
6b9ea5a6 RP |
5153 | return err; |
5154 | } | |
5155 | ||
5156 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
5157 | if (!nh) | |
5158 | return -ENOMEM; | |
8d1c802b | 5159 | nh->fib6_info = rt; |
6b9ea5a6 RP |
5160 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); |
5161 | list_add_tail(&nh->next, rt6_nh_list); | |
5162 | ||
5163 | return 0; | |
5164 | } | |
5165 | ||
8d1c802b DA |
5166 | static void ip6_route_mpath_notify(struct fib6_info *rt, |
5167 | struct fib6_info *rt_last, | |
3b1137fe DA |
5168 | struct nl_info *info, |
5169 | __u16 nlflags) | |
5170 | { | |
5171 | /* if this is an APPEND route, then rt points to the first route | |
5172 | * inserted and rt_last points to last route inserted. Userspace | |
5173 | * wants a consistent dump of the route which starts at the first | |
5174 | * nexthop. Since sibling routes are always added at the end of | |
5175 | * the list, find the first sibling of the last route appended | |
5176 | */ | |
93c2fb25 DA |
5177 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) { |
5178 | rt = list_first_entry(&rt_last->fib6_siblings, | |
8d1c802b | 5179 | struct fib6_info, |
93c2fb25 | 5180 | fib6_siblings); |
3b1137fe DA |
5181 | } |
5182 | ||
5183 | if (rt) | |
5184 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
5185 | } | |
5186 | ||
0ee0f47c IS |
5187 | static bool ip6_route_mpath_should_notify(const struct fib6_info *rt) |
5188 | { | |
5189 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); | |
5190 | bool should_notify = false; | |
5191 | struct fib6_info *leaf; | |
5192 | struct fib6_node *fn; | |
5193 | ||
5194 | rcu_read_lock(); | |
5195 | fn = rcu_dereference(rt->fib6_node); | |
5196 | if (!fn) | |
5197 | goto out; | |
5198 | ||
5199 | leaf = rcu_dereference(fn->leaf); | |
5200 | if (!leaf) | |
5201 | goto out; | |
5202 | ||
5203 | if (rt == leaf || | |
5204 | (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric && | |
5205 | rt6_qualify_for_ecmp(leaf))) | |
5206 | should_notify = true; | |
5207 | out: | |
5208 | rcu_read_unlock(); | |
5209 | ||
5210 | return should_notify; | |
5211 | } | |
5212 | ||
4619bcf9 DA |
5213 | static int fib6_gw_from_attr(struct in6_addr *gw, struct nlattr *nla, |
5214 | struct netlink_ext_ack *extack) | |
5215 | { | |
5216 | if (nla_len(nla) < sizeof(*gw)) { | |
5217 | NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_GATEWAY"); | |
5218 | return -EINVAL; | |
5219 | } | |
5220 | ||
5221 | *gw = nla_get_in6_addr(nla); | |
5222 | ||
5223 | return 0; | |
5224 | } | |
5225 | ||
333c4301 DA |
5226 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
5227 | struct netlink_ext_ack *extack) | |
51ebd318 | 5228 | { |
8d1c802b | 5229 | struct fib6_info *rt_notif = NULL, *rt_last = NULL; |
3b1137fe | 5230 | struct nl_info *info = &cfg->fc_nlinfo; |
51ebd318 ND |
5231 | struct fib6_config r_cfg; |
5232 | struct rtnexthop *rtnh; | |
8d1c802b | 5233 | struct fib6_info *rt; |
6b9ea5a6 RP |
5234 | struct rt6_nh *err_nh; |
5235 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 5236 | __u16 nlflags; |
51ebd318 ND |
5237 | int remaining; |
5238 | int attrlen; | |
6b9ea5a6 RP |
5239 | int err = 1; |
5240 | int nhn = 0; | |
5241 | int replace = (cfg->fc_nlinfo.nlh && | |
5242 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
5243 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 5244 | |
3b1137fe DA |
5245 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
5246 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
5247 | nlflags |= NLM_F_APPEND; | |
5248 | ||
35f1b4e9 | 5249 | remaining = cfg->fc_mp_len; |
51ebd318 | 5250 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 5251 | |
6b9ea5a6 | 5252 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
8d1c802b | 5253 | * fib6_info structs per nexthop |
6b9ea5a6 | 5254 | */ |
51ebd318 ND |
5255 | while (rtnh_ok(rtnh, remaining)) { |
5256 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5257 | if (rtnh->rtnh_ifindex) | |
5258 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5259 | ||
5260 | attrlen = rtnh_attrlen(rtnh); | |
5261 | if (attrlen > 0) { | |
5262 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5263 | ||
5264 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5265 | if (nla) { | |
95bdba23 | 5266 | err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, |
4619bcf9 | 5267 | extack); |
95bdba23 DA |
5268 | if (err) |
5269 | goto cleanup; | |
4619bcf9 | 5270 | |
51ebd318 ND |
5271 | r_cfg.fc_flags |= RTF_GATEWAY; |
5272 | } | |
19e42e45 | 5273 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
8bda81a4 DA |
5274 | |
5275 | /* RTA_ENCAP_TYPE length checked in | |
5276 | * lwtunnel_valid_encap_type_attr | |
5277 | */ | |
19e42e45 RP |
5278 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); |
5279 | if (nla) | |
5280 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 5281 | } |
6b9ea5a6 | 5282 | |
68e2ffde | 5283 | r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK); |
acb54e3c | 5284 | rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack); |
8c5b83f0 RP |
5285 | if (IS_ERR(rt)) { |
5286 | err = PTR_ERR(rt); | |
5287 | rt = NULL; | |
6b9ea5a6 | 5288 | goto cleanup; |
8c5b83f0 | 5289 | } |
b5d2d75e DA |
5290 | if (!rt6_qualify_for_ecmp(rt)) { |
5291 | err = -EINVAL; | |
5292 | NL_SET_ERR_MSG(extack, | |
5293 | "Device only routes can not be added for IPv6 using the multipath API."); | |
5294 | fib6_info_release(rt); | |
5295 | goto cleanup; | |
5296 | } | |
6b9ea5a6 | 5297 | |
1cf844c7 | 5298 | rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1; |
398958ae | 5299 | |
d4ead6b3 DA |
5300 | err = ip6_route_info_append(info->nl_net, &rt6_nh_list, |
5301 | rt, &r_cfg); | |
51ebd318 | 5302 | if (err) { |
93531c67 | 5303 | fib6_info_release(rt); |
6b9ea5a6 RP |
5304 | goto cleanup; |
5305 | } | |
5306 | ||
5307 | rtnh = rtnh_next(rtnh, &remaining); | |
5308 | } | |
5309 | ||
9eee3b49 IS |
5310 | if (list_empty(&rt6_nh_list)) { |
5311 | NL_SET_ERR_MSG(extack, | |
5312 | "Invalid nexthop configuration - no valid nexthops"); | |
5313 | return -EINVAL; | |
5314 | } | |
5315 | ||
3b1137fe DA |
5316 | /* for add and replace send one notification with all nexthops. |
5317 | * Skip the notification in fib6_add_rt2node and send one with | |
5318 | * the full route when done | |
5319 | */ | |
5320 | info->skip_notify = 1; | |
5321 | ||
ebee3cad IS |
5322 | /* For add and replace, send one notification with all nexthops. For |
5323 | * append, send one notification with all appended nexthops. | |
5324 | */ | |
5325 | info->skip_notify_kernel = 1; | |
5326 | ||
6b9ea5a6 RP |
5327 | err_nh = NULL; |
5328 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
8d1c802b DA |
5329 | err = __ip6_ins_rt(nh->fib6_info, info, extack); |
5330 | fib6_info_release(nh->fib6_info); | |
93531c67 | 5331 | |
f7225172 DA |
5332 | if (!err) { |
5333 | /* save reference to last route successfully inserted */ | |
5334 | rt_last = nh->fib6_info; | |
5335 | ||
5336 | /* save reference to first route for notification */ | |
5337 | if (!rt_notif) | |
5338 | rt_notif = nh->fib6_info; | |
5339 | } | |
3b1137fe | 5340 | |
8d1c802b DA |
5341 | /* nh->fib6_info is used or freed at this point, reset to NULL*/ |
5342 | nh->fib6_info = NULL; | |
6b9ea5a6 RP |
5343 | if (err) { |
5344 | if (replace && nhn) | |
a5a82d84 JK |
5345 | NL_SET_ERR_MSG_MOD(extack, |
5346 | "multipath route replace failed (check consistency of installed routes)"); | |
6b9ea5a6 RP |
5347 | err_nh = nh; |
5348 | goto add_errout; | |
51ebd318 | 5349 | } |
6b9ea5a6 | 5350 | |
1a72418b | 5351 | /* Because each route is added like a single route we remove |
27596472 MK |
5352 | * these flags after the first nexthop: if there is a collision, |
5353 | * we have already failed to add the first nexthop: | |
5354 | * fib6_add_rt2node() has rejected it; when replacing, old | |
5355 | * nexthops have been replaced by first new, the rest should | |
5356 | * be added to it. | |
1a72418b | 5357 | */ |
864db232 MUA |
5358 | if (cfg->fc_nlinfo.nlh) { |
5359 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | | |
5360 | NLM_F_REPLACE); | |
5361 | cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE; | |
5362 | } | |
6b9ea5a6 RP |
5363 | nhn++; |
5364 | } | |
5365 | ||
0ee0f47c IS |
5366 | /* An in-kernel notification should only be sent in case the new |
5367 | * multipath route is added as the first route in the node, or if | |
5368 | * it was appended to it. We pass 'rt_notif' since it is the first | |
5369 | * sibling and might allow us to skip some checks in the replace case. | |
5370 | */ | |
5371 | if (ip6_route_mpath_should_notify(rt_notif)) { | |
5372 | enum fib_event_type fib_event; | |
5373 | ||
5374 | if (rt_notif->fib6_nsiblings != nhn - 1) | |
5375 | fib_event = FIB_EVENT_ENTRY_APPEND; | |
5376 | else | |
caafb250 | 5377 | fib_event = FIB_EVENT_ENTRY_REPLACE; |
0ee0f47c IS |
5378 | |
5379 | err = call_fib6_multipath_entry_notifiers(info->nl_net, | |
5380 | fib_event, rt_notif, | |
5381 | nhn - 1, extack); | |
5382 | if (err) { | |
5383 | /* Delete all the siblings that were just added */ | |
5384 | err_nh = NULL; | |
5385 | goto add_errout; | |
5386 | } | |
5387 | } | |
ebee3cad | 5388 | |
3b1137fe DA |
5389 | /* success ... tell user about new route */ |
5390 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
5391 | goto cleanup; |
5392 | ||
5393 | add_errout: | |
3b1137fe DA |
5394 | /* send notification for routes that were added so that |
5395 | * the delete notifications sent by ip6_route_del are | |
5396 | * coherent | |
5397 | */ | |
5398 | if (rt_notif) | |
5399 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
5400 | ||
6b9ea5a6 RP |
5401 | /* Delete routes that were already added */ |
5402 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
5403 | if (err_nh == nh) | |
5404 | break; | |
333c4301 | 5405 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
5406 | } |
5407 | ||
5408 | cleanup: | |
5409 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
8d1c802b DA |
5410 | if (nh->fib6_info) |
5411 | fib6_info_release(nh->fib6_info); | |
6b9ea5a6 RP |
5412 | list_del(&nh->next); |
5413 | kfree(nh); | |
5414 | } | |
5415 | ||
5416 | return err; | |
5417 | } | |
5418 | ||
333c4301 DA |
5419 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
5420 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
5421 | { |
5422 | struct fib6_config r_cfg; | |
5423 | struct rtnexthop *rtnh; | |
2291267e | 5424 | int last_err = 0; |
6b9ea5a6 RP |
5425 | int remaining; |
5426 | int attrlen; | |
2291267e | 5427 | int err; |
6b9ea5a6 RP |
5428 | |
5429 | remaining = cfg->fc_mp_len; | |
5430 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
5431 | ||
5432 | /* Parse a Multipath Entry */ | |
5433 | while (rtnh_ok(rtnh, remaining)) { | |
5434 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5435 | if (rtnh->rtnh_ifindex) | |
5436 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5437 | ||
5438 | attrlen = rtnh_attrlen(rtnh); | |
5439 | if (attrlen > 0) { | |
5440 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5441 | ||
5442 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5443 | if (nla) { | |
1ff15a71 DA |
5444 | err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, |
5445 | extack); | |
e30a845b DA |
5446 | if (err) { |
5447 | last_err = err; | |
5448 | goto next_rtnh; | |
5449 | } | |
1ff15a71 | 5450 | |
6b9ea5a6 RP |
5451 | r_cfg.fc_flags |= RTF_GATEWAY; |
5452 | } | |
5453 | } | |
333c4301 | 5454 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
5455 | if (err) |
5456 | last_err = err; | |
5457 | ||
e30a845b | 5458 | next_rtnh: |
51ebd318 ND |
5459 | rtnh = rtnh_next(rtnh, &remaining); |
5460 | } | |
5461 | ||
5462 | return last_err; | |
5463 | } | |
5464 | ||
c21ef3e3 DA |
5465 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5466 | struct netlink_ext_ack *extack) | |
1da177e4 | 5467 | { |
86872cb5 TG |
5468 | struct fib6_config cfg; |
5469 | int err; | |
1da177e4 | 5470 | |
333c4301 | 5471 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5472 | if (err < 0) |
5473 | return err; | |
5474 | ||
5b98324e DA |
5475 | if (cfg.fc_nh_id && |
5476 | !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) { | |
5477 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
5478 | return -EINVAL; | |
5479 | } | |
5480 | ||
51ebd318 | 5481 | if (cfg.fc_mp) |
333c4301 | 5482 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
5483 | else { |
5484 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 5485 | return ip6_route_del(&cfg, extack); |
0ae81335 | 5486 | } |
1da177e4 LT |
5487 | } |
5488 | ||
c21ef3e3 DA |
5489 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5490 | struct netlink_ext_ack *extack) | |
1da177e4 | 5491 | { |
86872cb5 TG |
5492 | struct fib6_config cfg; |
5493 | int err; | |
1da177e4 | 5494 | |
333c4301 | 5495 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5496 | if (err < 0) |
5497 | return err; | |
5498 | ||
67f69513 DA |
5499 | if (cfg.fc_metric == 0) |
5500 | cfg.fc_metric = IP6_RT_PRIO_USER; | |
5501 | ||
51ebd318 | 5502 | if (cfg.fc_mp) |
333c4301 | 5503 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 5504 | else |
acb54e3c | 5505 | return ip6_route_add(&cfg, GFP_KERNEL, extack); |
1da177e4 LT |
5506 | } |
5507 | ||
a1b7a1f0 DA |
5508 | /* add the overhead of this fib6_nh to nexthop_len */ |
5509 | static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg) | |
339bf98f | 5510 | { |
a1b7a1f0 | 5511 | int *nexthop_len = arg; |
beb1afac | 5512 | |
a1b7a1f0 DA |
5513 | *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */ |
5514 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5515 | + nla_total_size(16); /* RTA_GATEWAY */ | |
5516 | ||
5517 | if (nh->fib_nh_lws) { | |
5518 | /* RTA_ENCAP_TYPE */ | |
5519 | *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5520 | /* RTA_ENCAP */ | |
5521 | *nexthop_len += nla_total_size(2); | |
5522 | } | |
f88d8ea6 | 5523 | |
a1b7a1f0 DA |
5524 | return 0; |
5525 | } | |
beb1afac | 5526 | |
a1b7a1f0 DA |
5527 | static size_t rt6_nlmsg_size(struct fib6_info *f6i) |
5528 | { | |
5529 | int nexthop_len; | |
5530 | ||
5531 | if (f6i->nh) { | |
5532 | nexthop_len = nla_total_size(4); /* RTA_NH_ID */ | |
5533 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size, | |
5534 | &nexthop_len); | |
5535 | } else { | |
5536 | struct fib6_nh *nh = f6i->fib6_nh; | |
5537 | ||
5538 | nexthop_len = 0; | |
5539 | if (f6i->fib6_nsiblings) { | |
5540 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
5541 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5542 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5543 | + lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5544 | ||
5545 | nexthop_len *= f6i->fib6_nsiblings; | |
5546 | } | |
5547 | nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
beb1afac DA |
5548 | } |
5549 | ||
339bf98f TG |
5550 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
5551 | + nla_total_size(16) /* RTA_SRC */ | |
5552 | + nla_total_size(16) /* RTA_DST */ | |
5553 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5554 | + nla_total_size(16) /* RTA_PREFSRC */ | |
5555 | + nla_total_size(4) /* RTA_TABLE */ | |
5556 | + nla_total_size(4) /* RTA_IIF */ | |
5557 | + nla_total_size(4) /* RTA_OIF */ | |
5558 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 5559 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 5560 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 5561 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 5562 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
5563 | + nexthop_len; |
5564 | } | |
5565 | ||
f88d8ea6 DA |
5566 | static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh, |
5567 | unsigned char *flags) | |
5568 | { | |
5569 | if (nexthop_is_multipath(nh)) { | |
5570 | struct nlattr *mp; | |
5571 | ||
4255ff05 | 5572 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
f88d8ea6 DA |
5573 | if (!mp) |
5574 | goto nla_put_failure; | |
5575 | ||
7bdf4de1 | 5576 | if (nexthop_mpath_fill_node(skb, nh, AF_INET6)) |
f88d8ea6 DA |
5577 | goto nla_put_failure; |
5578 | ||
5579 | nla_nest_end(skb, mp); | |
5580 | } else { | |
5581 | struct fib6_nh *fib6_nh; | |
5582 | ||
5583 | fib6_nh = nexthop_fib6_nh(nh); | |
7bdf4de1 | 5584 | if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6, |
f88d8ea6 DA |
5585 | flags, false) < 0) |
5586 | goto nla_put_failure; | |
5587 | } | |
5588 | ||
5589 | return 0; | |
5590 | ||
5591 | nla_put_failure: | |
5592 | return -EMSGSIZE; | |
5593 | } | |
5594 | ||
d4ead6b3 | 5595 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 5596 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 5597 | struct in6_addr *dest, struct in6_addr *src, |
15e47304 | 5598 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 5599 | unsigned int flags) |
1da177e4 | 5600 | { |
22d0bd82 XL |
5601 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
5602 | struct rt6key *rt6_dst, *rt6_src; | |
5603 | u32 *pmetrics, table, rt6_flags; | |
f88d8ea6 | 5604 | unsigned char nh_flags = 0; |
2d7202bf | 5605 | struct nlmsghdr *nlh; |
22d0bd82 | 5606 | struct rtmsg *rtm; |
d4ead6b3 | 5607 | long expires = 0; |
1da177e4 | 5608 | |
15e47304 | 5609 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 5610 | if (!nlh) |
26932566 | 5611 | return -EMSGSIZE; |
2d7202bf | 5612 | |
22d0bd82 XL |
5613 | if (rt6) { |
5614 | rt6_dst = &rt6->rt6i_dst; | |
5615 | rt6_src = &rt6->rt6i_src; | |
5616 | rt6_flags = rt6->rt6i_flags; | |
5617 | } else { | |
5618 | rt6_dst = &rt->fib6_dst; | |
5619 | rt6_src = &rt->fib6_src; | |
5620 | rt6_flags = rt->fib6_flags; | |
5621 | } | |
5622 | ||
2d7202bf | 5623 | rtm = nlmsg_data(nlh); |
1da177e4 | 5624 | rtm->rtm_family = AF_INET6; |
22d0bd82 XL |
5625 | rtm->rtm_dst_len = rt6_dst->plen; |
5626 | rtm->rtm_src_len = rt6_src->plen; | |
1da177e4 | 5627 | rtm->rtm_tos = 0; |
93c2fb25 DA |
5628 | if (rt->fib6_table) |
5629 | table = rt->fib6_table->tb6_id; | |
c71099ac | 5630 | else |
9e762a4a | 5631 | table = RT6_TABLE_UNSPEC; |
97f0082a | 5632 | rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT; |
c78679e8 DM |
5633 | if (nla_put_u32(skb, RTA_TABLE, table)) |
5634 | goto nla_put_failure; | |
e8478e80 DA |
5635 | |
5636 | rtm->rtm_type = rt->fib6_type; | |
1da177e4 LT |
5637 | rtm->rtm_flags = 0; |
5638 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
93c2fb25 | 5639 | rtm->rtm_protocol = rt->fib6_protocol; |
1da177e4 | 5640 | |
22d0bd82 | 5641 | if (rt6_flags & RTF_CACHE) |
1da177e4 LT |
5642 | rtm->rtm_flags |= RTM_F_CLONED; |
5643 | ||
d4ead6b3 DA |
5644 | if (dest) { |
5645 | if (nla_put_in6_addr(skb, RTA_DST, dest)) | |
c78679e8 | 5646 | goto nla_put_failure; |
1ab1457c | 5647 | rtm->rtm_dst_len = 128; |
1da177e4 | 5648 | } else if (rtm->rtm_dst_len) |
22d0bd82 | 5649 | if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr)) |
c78679e8 | 5650 | goto nla_put_failure; |
1da177e4 LT |
5651 | #ifdef CONFIG_IPV6_SUBTREES |
5652 | if (src) { | |
930345ea | 5653 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 5654 | goto nla_put_failure; |
1ab1457c | 5655 | rtm->rtm_src_len = 128; |
c78679e8 | 5656 | } else if (rtm->rtm_src_len && |
22d0bd82 | 5657 | nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr)) |
c78679e8 | 5658 | goto nla_put_failure; |
1da177e4 | 5659 | #endif |
7bc570c8 YH |
5660 | if (iif) { |
5661 | #ifdef CONFIG_IPV6_MROUTE | |
22d0bd82 | 5662 | if (ipv6_addr_is_multicast(&rt6_dst->addr)) { |
fd61c6ba DA |
5663 | int err = ip6mr_get_route(net, skb, rtm, portid); |
5664 | ||
5665 | if (err == 0) | |
5666 | return 0; | |
5667 | if (err < 0) | |
5668 | goto nla_put_failure; | |
7bc570c8 YH |
5669 | } else |
5670 | #endif | |
c78679e8 DM |
5671 | if (nla_put_u32(skb, RTA_IIF, iif)) |
5672 | goto nla_put_failure; | |
d4ead6b3 | 5673 | } else if (dest) { |
1da177e4 | 5674 | struct in6_addr saddr_buf; |
d4ead6b3 | 5675 | if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && |
930345ea | 5676 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5677 | goto nla_put_failure; |
1da177e4 | 5678 | } |
2d7202bf | 5679 | |
93c2fb25 | 5680 | if (rt->fib6_prefsrc.plen) { |
c3968a85 | 5681 | struct in6_addr saddr_buf; |
93c2fb25 | 5682 | saddr_buf = rt->fib6_prefsrc.addr; |
930345ea | 5683 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5684 | goto nla_put_failure; |
c3968a85 DW |
5685 | } |
5686 | ||
d4ead6b3 DA |
5687 | pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics; |
5688 | if (rtnetlink_put_metrics(skb, pmetrics) < 0) | |
2d7202bf TG |
5689 | goto nla_put_failure; |
5690 | ||
93c2fb25 | 5691 | if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric)) |
c78679e8 | 5692 | goto nla_put_failure; |
8253947e | 5693 | |
beb1afac DA |
5694 | /* For multipath routes, walk the siblings list and add |
5695 | * each as a nexthop within RTA_MULTIPATH. | |
5696 | */ | |
22d0bd82 XL |
5697 | if (rt6) { |
5698 | if (rt6_flags & RTF_GATEWAY && | |
5699 | nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway)) | |
5700 | goto nla_put_failure; | |
5701 | ||
5702 | if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex)) | |
5703 | goto nla_put_failure; | |
6b13d8f7 OH |
5704 | |
5705 | if (dst->lwtstate && | |
5706 | lwtunnel_fill_encap(skb, dst->lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0) | |
5707 | goto nla_put_failure; | |
22d0bd82 | 5708 | } else if (rt->fib6_nsiblings) { |
8d1c802b | 5709 | struct fib6_info *sibling, *next_sibling; |
beb1afac DA |
5710 | struct nlattr *mp; |
5711 | ||
ae0be8de | 5712 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
beb1afac DA |
5713 | if (!mp) |
5714 | goto nla_put_failure; | |
5715 | ||
1cf844c7 | 5716 | if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common, |
597aa16c XL |
5717 | rt->fib6_nh->fib_nh_weight, AF_INET6, |
5718 | 0) < 0) | |
beb1afac DA |
5719 | goto nla_put_failure; |
5720 | ||
5721 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 | 5722 | &rt->fib6_siblings, fib6_siblings) { |
1cf844c7 | 5723 | if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common, |
7bdf4de1 | 5724 | sibling->fib6_nh->fib_nh_weight, |
597aa16c | 5725 | AF_INET6, 0) < 0) |
beb1afac DA |
5726 | goto nla_put_failure; |
5727 | } | |
5728 | ||
5729 | nla_nest_end(skb, mp); | |
f88d8ea6 DA |
5730 | } else if (rt->nh) { |
5731 | if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id)) | |
5732 | goto nla_put_failure; | |
ecc5663c | 5733 | |
f88d8ea6 DA |
5734 | if (nexthop_is_blackhole(rt->nh)) |
5735 | rtm->rtm_type = RTN_BLACKHOLE; | |
5736 | ||
4f80116d RP |
5737 | if (net->ipv4.sysctl_nexthop_compat_mode && |
5738 | rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0) | |
f88d8ea6 DA |
5739 | goto nla_put_failure; |
5740 | ||
5741 | rtm->rtm_flags |= nh_flags; | |
5742 | } else { | |
7bdf4de1 | 5743 | if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6, |
ecc5663c | 5744 | &nh_flags, false) < 0) |
beb1afac | 5745 | goto nla_put_failure; |
ecc5663c DA |
5746 | |
5747 | rtm->rtm_flags |= nh_flags; | |
beb1afac DA |
5748 | } |
5749 | ||
22d0bd82 | 5750 | if (rt6_flags & RTF_EXPIRES) { |
14895687 DA |
5751 | expires = dst ? dst->expires : rt->expires; |
5752 | expires -= jiffies; | |
5753 | } | |
69cdf8f9 | 5754 | |
bb3c4ab9 | 5755 | if (!dst) { |
d95d6320 | 5756 | if (READ_ONCE(rt->offload)) |
bb3c4ab9 | 5757 | rtm->rtm_flags |= RTM_F_OFFLOAD; |
d95d6320 | 5758 | if (READ_ONCE(rt->trap)) |
bb3c4ab9 | 5759 | rtm->rtm_flags |= RTM_F_TRAP; |
d95d6320 | 5760 | if (READ_ONCE(rt->offload_failed)) |
0c5fcf9e | 5761 | rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED; |
bb3c4ab9 IS |
5762 | } |
5763 | ||
d4ead6b3 | 5764 | if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0) |
e3703b3d | 5765 | goto nla_put_failure; |
2d7202bf | 5766 | |
22d0bd82 | 5767 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags))) |
c78ba6d6 LR |
5768 | goto nla_put_failure; |
5769 | ||
19e42e45 | 5770 | |
053c095a JB |
5771 | nlmsg_end(skb, nlh); |
5772 | return 0; | |
2d7202bf TG |
5773 | |
5774 | nla_put_failure: | |
26932566 PM |
5775 | nlmsg_cancel(skb, nlh); |
5776 | return -EMSGSIZE; | |
1da177e4 LT |
5777 | } |
5778 | ||
2c170e07 DA |
5779 | static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg) |
5780 | { | |
5781 | const struct net_device *dev = arg; | |
5782 | ||
5783 | if (nh->fib_nh_dev == dev) | |
5784 | return 1; | |
5785 | ||
5786 | return 0; | |
5787 | } | |
5788 | ||
13e38901 DA |
5789 | static bool fib6_info_uses_dev(const struct fib6_info *f6i, |
5790 | const struct net_device *dev) | |
5791 | { | |
2c170e07 DA |
5792 | if (f6i->nh) { |
5793 | struct net_device *_dev = (struct net_device *)dev; | |
5794 | ||
5795 | return !!nexthop_for_each_fib6_nh(f6i->nh, | |
5796 | fib6_info_nh_uses_dev, | |
5797 | _dev); | |
5798 | } | |
5799 | ||
1cf844c7 | 5800 | if (f6i->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5801 | return true; |
5802 | ||
5803 | if (f6i->fib6_nsiblings) { | |
5804 | struct fib6_info *sibling, *next_sibling; | |
5805 | ||
5806 | list_for_each_entry_safe(sibling, next_sibling, | |
5807 | &f6i->fib6_siblings, fib6_siblings) { | |
1cf844c7 | 5808 | if (sibling->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5809 | return true; |
5810 | } | |
5811 | } | |
5812 | ||
5813 | return false; | |
5814 | } | |
5815 | ||
1e47b483 SB |
5816 | struct fib6_nh_exception_dump_walker { |
5817 | struct rt6_rtnl_dump_arg *dump; | |
5818 | struct fib6_info *rt; | |
5819 | unsigned int flags; | |
5820 | unsigned int skip; | |
5821 | unsigned int count; | |
5822 | }; | |
5823 | ||
5824 | static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg) | |
5825 | { | |
5826 | struct fib6_nh_exception_dump_walker *w = arg; | |
5827 | struct rt6_rtnl_dump_arg *dump = w->dump; | |
5828 | struct rt6_exception_bucket *bucket; | |
5829 | struct rt6_exception *rt6_ex; | |
5830 | int i, err; | |
5831 | ||
5832 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); | |
5833 | if (!bucket) | |
5834 | return 0; | |
5835 | ||
5836 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
5837 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
5838 | if (w->skip) { | |
5839 | w->skip--; | |
5840 | continue; | |
5841 | } | |
5842 | ||
5843 | /* Expiration of entries doesn't bump sernum, insertion | |
5844 | * does. Removal is triggered by insertion, so we can | |
5845 | * rely on the fact that if entries change between two | |
5846 | * partial dumps, this node is scanned again completely, | |
5847 | * see rt6_insert_exception() and fib6_dump_table(). | |
5848 | * | |
5849 | * Count expired entries we go through as handled | |
5850 | * entries that we'll skip next time, in case of partial | |
5851 | * node dump. Otherwise, if entries expire meanwhile, | |
5852 | * we'll skip the wrong amount. | |
5853 | */ | |
5854 | if (rt6_check_expired(rt6_ex->rt6i)) { | |
5855 | w->count++; | |
5856 | continue; | |
5857 | } | |
5858 | ||
5859 | err = rt6_fill_node(dump->net, dump->skb, w->rt, | |
5860 | &rt6_ex->rt6i->dst, NULL, NULL, 0, | |
5861 | RTM_NEWROUTE, | |
5862 | NETLINK_CB(dump->cb->skb).portid, | |
5863 | dump->cb->nlh->nlmsg_seq, w->flags); | |
5864 | if (err) | |
5865 | return err; | |
5866 | ||
5867 | w->count++; | |
5868 | } | |
5869 | bucket++; | |
5870 | } | |
5871 | ||
5872 | return 0; | |
5873 | } | |
5874 | ||
bf9a8a06 | 5875 | /* Return -1 if done with node, number of handled routes on partial dump */ |
1e47b483 | 5876 | int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip) |
1da177e4 LT |
5877 | { |
5878 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
13e38901 DA |
5879 | struct fib_dump_filter *filter = &arg->filter; |
5880 | unsigned int flags = NLM_F_MULTI; | |
1f17e2f2 | 5881 | struct net *net = arg->net; |
1e47b483 | 5882 | int count = 0; |
1f17e2f2 | 5883 | |
421842ed | 5884 | if (rt == net->ipv6.fib6_null_entry) |
bf9a8a06 | 5885 | return -1; |
1da177e4 | 5886 | |
13e38901 DA |
5887 | if ((filter->flags & RTM_F_PREFIX) && |
5888 | !(rt->fib6_flags & RTF_PREFIX_RT)) { | |
5889 | /* success since this is not a prefix route */ | |
bf9a8a06 | 5890 | return -1; |
13e38901 | 5891 | } |
1e47b483 SB |
5892 | if (filter->filter_set && |
5893 | ((filter->rt_type && rt->fib6_type != filter->rt_type) || | |
5894 | (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) || | |
5895 | (filter->protocol && rt->fib6_protocol != filter->protocol))) { | |
5896 | return -1; | |
5897 | } | |
5898 | ||
5899 | if (filter->filter_set || | |
5900 | !filter->dump_routes || !filter->dump_exceptions) { | |
13e38901 | 5901 | flags |= NLM_F_DUMP_FILTERED; |
f8cfe2ce | 5902 | } |
1da177e4 | 5903 | |
1e47b483 SB |
5904 | if (filter->dump_routes) { |
5905 | if (skip) { | |
5906 | skip--; | |
5907 | } else { | |
5908 | if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, | |
5909 | 0, RTM_NEWROUTE, | |
5910 | NETLINK_CB(arg->cb->skb).portid, | |
5911 | arg->cb->nlh->nlmsg_seq, flags)) { | |
5912 | return 0; | |
5913 | } | |
5914 | count++; | |
5915 | } | |
5916 | } | |
5917 | ||
5918 | if (filter->dump_exceptions) { | |
5919 | struct fib6_nh_exception_dump_walker w = { .dump = arg, | |
5920 | .rt = rt, | |
5921 | .flags = flags, | |
5922 | .skip = skip, | |
5923 | .count = 0 }; | |
5924 | int err; | |
5925 | ||
3b525691 | 5926 | rcu_read_lock(); |
1e47b483 SB |
5927 | if (rt->nh) { |
5928 | err = nexthop_for_each_fib6_nh(rt->nh, | |
5929 | rt6_nh_dump_exceptions, | |
5930 | &w); | |
5931 | } else { | |
5932 | err = rt6_nh_dump_exceptions(rt->fib6_nh, &w); | |
5933 | } | |
3b525691 | 5934 | rcu_read_unlock(); |
1e47b483 SB |
5935 | |
5936 | if (err) | |
5937 | return count += w.count; | |
5938 | } | |
bf9a8a06 SB |
5939 | |
5940 | return -1; | |
1da177e4 LT |
5941 | } |
5942 | ||
0eff0a27 JK |
5943 | static int inet6_rtm_valid_getroute_req(struct sk_buff *skb, |
5944 | const struct nlmsghdr *nlh, | |
5945 | struct nlattr **tb, | |
5946 | struct netlink_ext_ack *extack) | |
5947 | { | |
5948 | struct rtmsg *rtm; | |
5949 | int i, err; | |
5950 | ||
5951 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
5952 | NL_SET_ERR_MSG_MOD(extack, | |
5953 | "Invalid header for get route request"); | |
5954 | return -EINVAL; | |
5955 | } | |
5956 | ||
5957 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
5958 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5959 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5960 | |
5961 | rtm = nlmsg_data(nlh); | |
5962 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || | |
5963 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || | |
5964 | rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || | |
5965 | rtm->rtm_type) { | |
5966 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
5967 | return -EINVAL; | |
5968 | } | |
5969 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
5970 | NL_SET_ERR_MSG_MOD(extack, | |
5971 | "Invalid flags for get route request"); | |
5972 | return -EINVAL; | |
5973 | } | |
5974 | ||
8cb08174 JB |
5975 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
5976 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5977 | if (err) |
5978 | return err; | |
5979 | ||
5980 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
5981 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
5982 | NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); | |
5983 | return -EINVAL; | |
5984 | } | |
5985 | ||
5986 | for (i = 0; i <= RTA_MAX; i++) { | |
5987 | if (!tb[i]) | |
5988 | continue; | |
5989 | ||
5990 | switch (i) { | |
5991 | case RTA_SRC: | |
5992 | case RTA_DST: | |
5993 | case RTA_IIF: | |
5994 | case RTA_OIF: | |
5995 | case RTA_MARK: | |
5996 | case RTA_UID: | |
5997 | case RTA_SPORT: | |
5998 | case RTA_DPORT: | |
5999 | case RTA_IP_PROTO: | |
6000 | break; | |
6001 | default: | |
6002 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
6003 | return -EINVAL; | |
6004 | } | |
6005 | } | |
6006 | ||
6007 | return 0; | |
6008 | } | |
6009 | ||
c21ef3e3 DA |
6010 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
6011 | struct netlink_ext_ack *extack) | |
1da177e4 | 6012 | { |
3b1e0a65 | 6013 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 6014 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c | 6015 | int err, iif = 0, oif = 0; |
a68886a6 | 6016 | struct fib6_info *from; |
18c3a61c | 6017 | struct dst_entry *dst; |
ab364a6f | 6018 | struct rt6_info *rt; |
1da177e4 | 6019 | struct sk_buff *skb; |
ab364a6f | 6020 | struct rtmsg *rtm; |
744486d4 | 6021 | struct flowi6 fl6 = {}; |
18c3a61c | 6022 | bool fibmatch; |
1da177e4 | 6023 | |
0eff0a27 | 6024 | err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
ab364a6f TG |
6025 | if (err < 0) |
6026 | goto errout; | |
1da177e4 | 6027 | |
ab364a6f | 6028 | err = -EINVAL; |
38b7097b HFS |
6029 | rtm = nlmsg_data(nlh); |
6030 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 6031 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 6032 | |
ab364a6f TG |
6033 | if (tb[RTA_SRC]) { |
6034 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
6035 | goto errout; | |
6036 | ||
4e3fd7a0 | 6037 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
6038 | } |
6039 | ||
6040 | if (tb[RTA_DST]) { | |
6041 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
6042 | goto errout; | |
6043 | ||
4e3fd7a0 | 6044 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
6045 | } |
6046 | ||
6047 | if (tb[RTA_IIF]) | |
6048 | iif = nla_get_u32(tb[RTA_IIF]); | |
6049 | ||
6050 | if (tb[RTA_OIF]) | |
72331bc0 | 6051 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 6052 | |
2e47b291 LC |
6053 | if (tb[RTA_MARK]) |
6054 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
6055 | ||
622ec2c9 LC |
6056 | if (tb[RTA_UID]) |
6057 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
6058 | nla_get_u32(tb[RTA_UID])); | |
6059 | else | |
6060 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
6061 | ||
eacb9384 RP |
6062 | if (tb[RTA_SPORT]) |
6063 | fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]); | |
6064 | ||
6065 | if (tb[RTA_DPORT]) | |
6066 | fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]); | |
6067 | ||
6068 | if (tb[RTA_IP_PROTO]) { | |
6069 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea HL |
6070 | &fl6.flowi6_proto, AF_INET6, |
6071 | extack); | |
eacb9384 RP |
6072 | if (err) |
6073 | goto errout; | |
6074 | } | |
6075 | ||
1da177e4 LT |
6076 | if (iif) { |
6077 | struct net_device *dev; | |
72331bc0 SL |
6078 | int flags = 0; |
6079 | ||
121622db FW |
6080 | rcu_read_lock(); |
6081 | ||
6082 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 6083 | if (!dev) { |
121622db | 6084 | rcu_read_unlock(); |
1da177e4 | 6085 | err = -ENODEV; |
ab364a6f | 6086 | goto errout; |
1da177e4 | 6087 | } |
72331bc0 SL |
6088 | |
6089 | fl6.flowi6_iif = iif; | |
6090 | ||
6091 | if (!ipv6_addr_any(&fl6.saddr)) | |
6092 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
6093 | ||
b75cc8f9 | 6094 | dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags); |
121622db FW |
6095 | |
6096 | rcu_read_unlock(); | |
72331bc0 SL |
6097 | } else { |
6098 | fl6.flowi6_oif = oif; | |
6099 | ||
58acfd71 | 6100 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
6101 | } |
6102 | ||
18c3a61c RP |
6103 | |
6104 | rt = container_of(dst, struct rt6_info, dst); | |
6105 | if (rt->dst.error) { | |
6106 | err = rt->dst.error; | |
6107 | ip6_rt_put(rt); | |
6108 | goto errout; | |
1da177e4 LT |
6109 | } |
6110 | ||
9d6acb3b WC |
6111 | if (rt == net->ipv6.ip6_null_entry) { |
6112 | err = rt->dst.error; | |
6113 | ip6_rt_put(rt); | |
6114 | goto errout; | |
6115 | } | |
6116 | ||
ab364a6f | 6117 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 6118 | if (!skb) { |
94e187c0 | 6119 | ip6_rt_put(rt); |
ab364a6f TG |
6120 | err = -ENOBUFS; |
6121 | goto errout; | |
6122 | } | |
1da177e4 | 6123 | |
d8d1f30b | 6124 | skb_dst_set(skb, &rt->dst); |
a68886a6 DA |
6125 | |
6126 | rcu_read_lock(); | |
6127 | from = rcu_dereference(rt->from); | |
886b7a50 MKL |
6128 | if (from) { |
6129 | if (fibmatch) | |
6130 | err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, | |
6131 | iif, RTM_NEWROUTE, | |
6132 | NETLINK_CB(in_skb).portid, | |
6133 | nlh->nlmsg_seq, 0); | |
6134 | else | |
6135 | err = rt6_fill_node(net, skb, from, dst, &fl6.daddr, | |
6136 | &fl6.saddr, iif, RTM_NEWROUTE, | |
6137 | NETLINK_CB(in_skb).portid, | |
6138 | nlh->nlmsg_seq, 0); | |
6139 | } else { | |
6140 | err = -ENETUNREACH; | |
6141 | } | |
a68886a6 DA |
6142 | rcu_read_unlock(); |
6143 | ||
1da177e4 | 6144 | if (err < 0) { |
ab364a6f TG |
6145 | kfree_skb(skb); |
6146 | goto errout; | |
1da177e4 LT |
6147 | } |
6148 | ||
15e47304 | 6149 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 6150 | errout: |
1da177e4 | 6151 | return err; |
1da177e4 LT |
6152 | } |
6153 | ||
8d1c802b | 6154 | void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info, |
37a1d361 | 6155 | unsigned int nlm_flags) |
1da177e4 LT |
6156 | { |
6157 | struct sk_buff *skb; | |
5578689a | 6158 | struct net *net = info->nl_net; |
528c4ceb DL |
6159 | u32 seq; |
6160 | int err; | |
6161 | ||
6162 | err = -ENOBUFS; | |
38308473 | 6163 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 6164 | |
19e42e45 | 6165 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 6166 | if (!skb) |
21713ebc TG |
6167 | goto errout; |
6168 | ||
d4ead6b3 DA |
6169 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, |
6170 | event, info->portid, seq, nlm_flags); | |
26932566 PM |
6171 | if (err < 0) { |
6172 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6173 | WARN_ON(err == -EMSGSIZE); | |
6174 | kfree_skb(skb); | |
6175 | goto errout; | |
6176 | } | |
15e47304 | 6177 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
6178 | info->nlh, gfp_any()); |
6179 | return; | |
21713ebc TG |
6180 | errout: |
6181 | if (err < 0) | |
5578689a | 6182 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
6183 | } |
6184 | ||
19a3b7ee DA |
6185 | void fib6_rt_update(struct net *net, struct fib6_info *rt, |
6186 | struct nl_info *info) | |
6187 | { | |
6188 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
6189 | struct sk_buff *skb; | |
6190 | int err = -ENOBUFS; | |
6191 | ||
19a3b7ee DA |
6192 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
6193 | if (!skb) | |
6194 | goto errout; | |
6195 | ||
6196 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, | |
6197 | RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE); | |
6198 | if (err < 0) { | |
6199 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6200 | WARN_ON(err == -EMSGSIZE); | |
6201 | kfree_skb(skb); | |
6202 | goto errout; | |
6203 | } | |
6204 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, | |
6205 | info->nlh, gfp_any()); | |
6206 | return; | |
6207 | errout: | |
6208 | if (err < 0) | |
6209 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6210 | } | |
6211 | ||
907eea48 | 6212 | void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i, |
0c5fcf9e | 6213 | bool offload, bool trap, bool offload_failed) |
907eea48 AC |
6214 | { |
6215 | struct sk_buff *skb; | |
6216 | int err; | |
6217 | ||
d95d6320 ED |
6218 | if (READ_ONCE(f6i->offload) == offload && |
6219 | READ_ONCE(f6i->trap) == trap && | |
6220 | READ_ONCE(f6i->offload_failed) == offload_failed) | |
907eea48 AC |
6221 | return; |
6222 | ||
d95d6320 ED |
6223 | WRITE_ONCE(f6i->offload, offload); |
6224 | WRITE_ONCE(f6i->trap, trap); | |
6fad361a AC |
6225 | |
6226 | /* 2 means send notifications only if offload_failed was changed. */ | |
6227 | if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 && | |
d95d6320 | 6228 | READ_ONCE(f6i->offload_failed) == offload_failed) |
6fad361a AC |
6229 | return; |
6230 | ||
d95d6320 | 6231 | WRITE_ONCE(f6i->offload_failed, offload_failed); |
907eea48 AC |
6232 | |
6233 | if (!rcu_access_pointer(f6i->fib6_node)) | |
6234 | /* The route was removed from the tree, do not send | |
89e8347f | 6235 | * notification. |
907eea48 AC |
6236 | */ |
6237 | return; | |
6238 | ||
6239 | if (!net->ipv6.sysctl.fib_notify_on_flag_change) | |
6240 | return; | |
6241 | ||
6242 | skb = nlmsg_new(rt6_nlmsg_size(f6i), GFP_KERNEL); | |
6243 | if (!skb) { | |
6244 | err = -ENOBUFS; | |
6245 | goto errout; | |
6246 | } | |
6247 | ||
6248 | err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0, | |
6249 | 0, 0); | |
6250 | if (err < 0) { | |
6251 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6252 | WARN_ON(err == -EMSGSIZE); | |
6253 | kfree_skb(skb); | |
6254 | goto errout; | |
6255 | } | |
6256 | ||
6257 | rtnl_notify(skb, net, 0, RTNLGRP_IPV6_ROUTE, NULL, GFP_KERNEL); | |
6258 | return; | |
6259 | ||
6260 | errout: | |
6261 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6262 | } | |
6263 | EXPORT_SYMBOL(fib6_info_hw_flags_set); | |
6264 | ||
8ed67789 | 6265 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 6266 | unsigned long event, void *ptr) |
8ed67789 | 6267 | { |
351638e7 | 6268 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 6269 | struct net *net = dev_net(dev); |
8ed67789 | 6270 | |
242d3a49 WC |
6271 | if (!(dev->flags & IFF_LOOPBACK)) |
6272 | return NOTIFY_OK; | |
6273 | ||
6274 | if (event == NETDEV_REGISTER) { | |
1cf844c7 | 6275 | net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev; |
d8d1f30b | 6276 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
6277 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
6278 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 6279 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 6280 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 6281 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 6282 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 6283 | #endif |
76da0704 WC |
6284 | } else if (event == NETDEV_UNREGISTER && |
6285 | dev->reg_state != NETREG_UNREGISTERED) { | |
6286 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
6287 | * netdev_wait_allrefs(). Make sure we only call this once. | |
6288 | */ | |
12d94a80 | 6289 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 6290 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
6291 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
6292 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
6293 | #endif |
6294 | } | |
6295 | ||
6296 | return NOTIFY_OK; | |
6297 | } | |
6298 | ||
1da177e4 LT |
6299 | /* |
6300 | * /proc | |
6301 | */ | |
6302 | ||
6303 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
6304 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
6305 | { | |
69ddb805 | 6306 | struct net *net = (struct net *)seq->private; |
1da177e4 | 6307 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
6308 | net->ipv6.rt6_stats->fib_nodes, |
6309 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 6310 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
6311 | net->ipv6.rt6_stats->fib_rt_entries, |
6312 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 6313 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 6314 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
6315 | |
6316 | return 0; | |
6317 | } | |
1da177e4 LT |
6318 | #endif /* CONFIG_PROC_FS */ |
6319 | ||
6320 | #ifdef CONFIG_SYSCTL | |
6321 | ||
32927393 CH |
6322 | static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
6323 | void *buffer, size_t *lenp, loff_t *ppos) | |
1da177e4 | 6324 | { |
c486da34 LAG |
6325 | struct net *net; |
6326 | int delay; | |
f0fb9b28 | 6327 | int ret; |
c486da34 | 6328 | if (!write) |
1da177e4 | 6329 | return -EINVAL; |
c486da34 LAG |
6330 | |
6331 | net = (struct net *)ctl->extra1; | |
6332 | delay = net->ipv6.sysctl.flush_delay; | |
f0fb9b28 AP |
6333 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
6334 | if (ret) | |
6335 | return ret; | |
6336 | ||
2ac3ac8f | 6337 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 6338 | return 0; |
1da177e4 LT |
6339 | } |
6340 | ||
ed792e28 | 6341 | static struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 6342 | { |
06e6c88f AK |
6343 | .procname = "max_size", |
6344 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, | |
1da177e4 | 6345 | .maxlen = sizeof(int), |
06e6c88f AK |
6346 | .mode = 0644, |
6347 | .proc_handler = proc_dointvec, | |
1da177e4 LT |
6348 | }, |
6349 | { | |
1da177e4 | 6350 | .procname = "gc_thresh", |
9a7ec3a9 | 6351 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
6352 | .maxlen = sizeof(int), |
6353 | .mode = 0644, | |
6d9f239a | 6354 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6355 | }, |
6356 | { | |
06e6c88f AK |
6357 | .procname = "flush", |
6358 | .data = &init_net.ipv6.sysctl.flush_delay, | |
1da177e4 | 6359 | .maxlen = sizeof(int), |
06e6c88f AK |
6360 | .mode = 0200, |
6361 | .proc_handler = ipv6_sysctl_rtcache_flush | |
1da177e4 LT |
6362 | }, |
6363 | { | |
1da177e4 | 6364 | .procname = "gc_min_interval", |
4990509f | 6365 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6366 | .maxlen = sizeof(int), |
6367 | .mode = 0644, | |
6d9f239a | 6368 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6369 | }, |
6370 | { | |
1da177e4 | 6371 | .procname = "gc_timeout", |
4990509f | 6372 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
6373 | .maxlen = sizeof(int), |
6374 | .mode = 0644, | |
6d9f239a | 6375 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6376 | }, |
6377 | { | |
1da177e4 | 6378 | .procname = "gc_interval", |
4990509f | 6379 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
6380 | .maxlen = sizeof(int), |
6381 | .mode = 0644, | |
6d9f239a | 6382 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6383 | }, |
6384 | { | |
1da177e4 | 6385 | .procname = "gc_elasticity", |
4990509f | 6386 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
6387 | .maxlen = sizeof(int), |
6388 | .mode = 0644, | |
f3d3f616 | 6389 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6390 | }, |
6391 | { | |
1da177e4 | 6392 | .procname = "mtu_expires", |
4990509f | 6393 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
6394 | .maxlen = sizeof(int), |
6395 | .mode = 0644, | |
6d9f239a | 6396 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6397 | }, |
6398 | { | |
1da177e4 | 6399 | .procname = "min_adv_mss", |
4990509f | 6400 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
6401 | .maxlen = sizeof(int), |
6402 | .mode = 0644, | |
f3d3f616 | 6403 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6404 | }, |
6405 | { | |
1da177e4 | 6406 | .procname = "gc_min_interval_ms", |
4990509f | 6407 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6408 | .maxlen = sizeof(int), |
6409 | .mode = 0644, | |
6d9f239a | 6410 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 6411 | }, |
7c6bb7d2 DA |
6412 | { |
6413 | .procname = "skip_notify_on_dev_down", | |
6414 | .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down, | |
6415 | .maxlen = sizeof(int), | |
6416 | .mode = 0644, | |
b8e8a863 | 6417 | .proc_handler = proc_dointvec_minmax, |
eec4844f MC |
6418 | .extra1 = SYSCTL_ZERO, |
6419 | .extra2 = SYSCTL_ONE, | |
7c6bb7d2 | 6420 | }, |
f8572d8f | 6421 | { } |
1da177e4 LT |
6422 | }; |
6423 | ||
2c8c1e72 | 6424 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
6425 | { |
6426 | struct ctl_table *table; | |
6427 | ||
6428 | table = kmemdup(ipv6_route_table_template, | |
6429 | sizeof(ipv6_route_table_template), | |
6430 | GFP_KERNEL); | |
5ee09105 YH |
6431 | |
6432 | if (table) { | |
06e6c88f | 6433 | table[0].data = &net->ipv6.sysctl.ip6_rt_max_size; |
86393e52 | 6434 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
06e6c88f AK |
6435 | table[2].data = &net->ipv6.sysctl.flush_delay; |
6436 | table[2].extra1 = net; | |
5ee09105 YH |
6437 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
6438 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
6439 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
6440 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
6441 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
6442 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 6443 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7c6bb7d2 | 6444 | table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down; |
464dc801 EB |
6445 | |
6446 | /* Don't export sysctls to unprivileged users */ | |
6447 | if (net->user_ns != &init_user_ns) | |
06e6c88f | 6448 | table[1].procname = NULL; |
5ee09105 YH |
6449 | } |
6450 | ||
760f2d01 DL |
6451 | return table; |
6452 | } | |
1da177e4 LT |
6453 | #endif |
6454 | ||
2c8c1e72 | 6455 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 6456 | { |
633d424b | 6457 | int ret = -ENOMEM; |
8ed67789 | 6458 | |
86393e52 AD |
6459 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
6460 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 6461 | |
fc66f95c ED |
6462 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
6463 | goto out_ip6_dst_ops; | |
6464 | ||
1cf844c7 | 6465 | net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true); |
421842ed DA |
6466 | if (!net->ipv6.fib6_null_entry) |
6467 | goto out_ip6_dst_entries; | |
1cf844c7 DA |
6468 | memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template, |
6469 | sizeof(*net->ipv6.fib6_null_entry)); | |
421842ed | 6470 | |
8ed67789 DL |
6471 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
6472 | sizeof(*net->ipv6.ip6_null_entry), | |
6473 | GFP_KERNEL); | |
6474 | if (!net->ipv6.ip6_null_entry) | |
421842ed | 6475 | goto out_fib6_null_entry; |
d8d1f30b | 6476 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6477 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
6478 | ip6_template_metrics, true); | |
74109218 | 6479 | INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached); |
8ed67789 DL |
6480 | |
6481 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 6482 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
6483 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
6484 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
6485 | GFP_KERNEL); | |
68fffc67 PZ |
6486 | if (!net->ipv6.ip6_prohibit_entry) |
6487 | goto out_ip6_null_entry; | |
d8d1f30b | 6488 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6489 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
6490 | ip6_template_metrics, true); | |
74109218 | 6491 | INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached); |
8ed67789 DL |
6492 | |
6493 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
6494 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
6495 | GFP_KERNEL); | |
68fffc67 PZ |
6496 | if (!net->ipv6.ip6_blk_hole_entry) |
6497 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 6498 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6499 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
6500 | ip6_template_metrics, true); | |
74109218 | 6501 | INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached); |
b9b33e7c PA |
6502 | #ifdef CONFIG_IPV6_SUBTREES |
6503 | net->ipv6.fib6_routes_require_src = 0; | |
6504 | #endif | |
8ed67789 DL |
6505 | #endif |
6506 | ||
b339a47c PZ |
6507 | net->ipv6.sysctl.flush_delay = 0; |
6508 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
6509 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
6510 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
6511 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
6512 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
6513 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
6514 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
7c6bb7d2 | 6515 | net->ipv6.sysctl.skip_notify_on_dev_down = 0; |
b339a47c | 6516 | |
9cb7c013 | 6517 | atomic_set(&net->ipv6.ip6_rt_gc_expire, 30*HZ); |
6891a346 | 6518 | |
8ed67789 DL |
6519 | ret = 0; |
6520 | out: | |
6521 | return ret; | |
f2fc6a54 | 6522 | |
68fffc67 PZ |
6523 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
6524 | out_ip6_prohibit_entry: | |
6525 | kfree(net->ipv6.ip6_prohibit_entry); | |
6526 | out_ip6_null_entry: | |
6527 | kfree(net->ipv6.ip6_null_entry); | |
6528 | #endif | |
421842ed DA |
6529 | out_fib6_null_entry: |
6530 | kfree(net->ipv6.fib6_null_entry); | |
fc66f95c ED |
6531 | out_ip6_dst_entries: |
6532 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 6533 | out_ip6_dst_ops: |
f2fc6a54 | 6534 | goto out; |
cdb18761 DL |
6535 | } |
6536 | ||
2c8c1e72 | 6537 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 6538 | { |
421842ed | 6539 | kfree(net->ipv6.fib6_null_entry); |
8ed67789 DL |
6540 | kfree(net->ipv6.ip6_null_entry); |
6541 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6542 | kfree(net->ipv6.ip6_prohibit_entry); | |
6543 | kfree(net->ipv6.ip6_blk_hole_entry); | |
6544 | #endif | |
41bb78b4 | 6545 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
6546 | } |
6547 | ||
d189634e TG |
6548 | static int __net_init ip6_route_net_init_late(struct net *net) |
6549 | { | |
6550 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
6551 | proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops, |
6552 | sizeof(struct ipv6_route_iter)); | |
3617d949 CH |
6553 | proc_create_net_single("rt6_stats", 0444, net->proc_net, |
6554 | rt6_stats_seq_show, NULL); | |
d189634e TG |
6555 | #endif |
6556 | return 0; | |
6557 | } | |
6558 | ||
6559 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
6560 | { | |
6561 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
6562 | remove_proc_entry("ipv6_route", net->proc_net); |
6563 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
6564 | #endif |
6565 | } | |
6566 | ||
cdb18761 DL |
6567 | static struct pernet_operations ip6_route_net_ops = { |
6568 | .init = ip6_route_net_init, | |
6569 | .exit = ip6_route_net_exit, | |
6570 | }; | |
6571 | ||
c3426b47 DM |
6572 | static int __net_init ipv6_inetpeer_init(struct net *net) |
6573 | { | |
6574 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
6575 | ||
6576 | if (!bp) | |
6577 | return -ENOMEM; | |
6578 | inet_peer_base_init(bp); | |
6579 | net->ipv6.peers = bp; | |
6580 | return 0; | |
6581 | } | |
6582 | ||
6583 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
6584 | { | |
6585 | struct inet_peer_base *bp = net->ipv6.peers; | |
6586 | ||
6587 | net->ipv6.peers = NULL; | |
56a6b248 | 6588 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
6589 | kfree(bp); |
6590 | } | |
6591 | ||
2b823f72 | 6592 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
6593 | .init = ipv6_inetpeer_init, |
6594 | .exit = ipv6_inetpeer_exit, | |
6595 | }; | |
6596 | ||
d189634e TG |
6597 | static struct pernet_operations ip6_route_net_late_ops = { |
6598 | .init = ip6_route_net_init_late, | |
6599 | .exit = ip6_route_net_exit_late, | |
6600 | }; | |
6601 | ||
8ed67789 DL |
6602 | static struct notifier_block ip6_route_dev_notifier = { |
6603 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 6604 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
6605 | }; |
6606 | ||
2f460933 WC |
6607 | void __init ip6_route_init_special_entries(void) |
6608 | { | |
6609 | /* Registering of the loopback is done before this portion of code, | |
6610 | * the loopback reference in rt6_info will not be taken, do it | |
6611 | * manually for init_net */ | |
1cf844c7 | 6612 | init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev; |
2f460933 WC |
6613 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
6614 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6615 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6616 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
6617 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6618 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
6619 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6620 | #endif | |
6621 | } | |
6622 | ||
138d0be3 YS |
6623 | #if IS_BUILTIN(CONFIG_IPV6) |
6624 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6625 | DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt) | |
6626 | ||
951cf368 YS |
6627 | BTF_ID_LIST(btf_fib6_info_id) |
6628 | BTF_ID(struct, fib6_info) | |
6629 | ||
14fc6bd6 | 6630 | static const struct bpf_iter_seq_info ipv6_route_seq_info = { |
15172a46 YS |
6631 | .seq_ops = &ipv6_route_seq_ops, |
6632 | .init_seq_private = bpf_iter_init_seq_net, | |
6633 | .fini_seq_private = bpf_iter_fini_seq_net, | |
6634 | .seq_priv_size = sizeof(struct ipv6_route_iter), | |
14fc6bd6 YS |
6635 | }; |
6636 | ||
6637 | static struct bpf_iter_reg ipv6_route_reg_info = { | |
6638 | .target = "ipv6_route", | |
3c32cc1b YS |
6639 | .ctx_arg_info_size = 1, |
6640 | .ctx_arg_info = { | |
6641 | { offsetof(struct bpf_iter__ipv6_route, rt), | |
6642 | PTR_TO_BTF_ID_OR_NULL }, | |
6643 | }, | |
14fc6bd6 | 6644 | .seq_info = &ipv6_route_seq_info, |
15172a46 YS |
6645 | }; |
6646 | ||
138d0be3 YS |
6647 | static int __init bpf_iter_register(void) |
6648 | { | |
951cf368 | 6649 | ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id; |
15172a46 | 6650 | return bpf_iter_reg_target(&ipv6_route_reg_info); |
138d0be3 YS |
6651 | } |
6652 | ||
6653 | static void bpf_iter_unregister(void) | |
6654 | { | |
ab2ee4fc | 6655 | bpf_iter_unreg_target(&ipv6_route_reg_info); |
138d0be3 YS |
6656 | } |
6657 | #endif | |
6658 | #endif | |
6659 | ||
433d49c3 | 6660 | int __init ip6_route_init(void) |
1da177e4 | 6661 | { |
433d49c3 | 6662 | int ret; |
8d0b94af | 6663 | int cpu; |
433d49c3 | 6664 | |
9a7ec3a9 DL |
6665 | ret = -ENOMEM; |
6666 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 6667 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
6126891c | 6668 | SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, NULL); |
9a7ec3a9 | 6669 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 6670 | goto out; |
14e50e57 | 6671 | |
fc66f95c | 6672 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 6673 | if (ret) |
bdb3289f | 6674 | goto out_kmem_cache; |
bdb3289f | 6675 | |
c3426b47 DM |
6676 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
6677 | if (ret) | |
e8803b6c | 6678 | goto out_dst_entries; |
2a0c451a | 6679 | |
7e52b33b DM |
6680 | ret = register_pernet_subsys(&ip6_route_net_ops); |
6681 | if (ret) | |
6682 | goto out_register_inetpeer; | |
c3426b47 | 6683 | |
5dc121e9 AE |
6684 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
6685 | ||
e8803b6c | 6686 | ret = fib6_init(); |
433d49c3 | 6687 | if (ret) |
8ed67789 | 6688 | goto out_register_subsys; |
433d49c3 | 6689 | |
433d49c3 DL |
6690 | ret = xfrm6_init(); |
6691 | if (ret) | |
e8803b6c | 6692 | goto out_fib6_init; |
c35b7e72 | 6693 | |
433d49c3 DL |
6694 | ret = fib6_rules_init(); |
6695 | if (ret) | |
6696 | goto xfrm6_init; | |
7e5449c2 | 6697 | |
d189634e TG |
6698 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
6699 | if (ret) | |
6700 | goto fib6_rules_init; | |
6701 | ||
16feebcf FW |
6702 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
6703 | inet6_rtm_newroute, NULL, 0); | |
6704 | if (ret < 0) | |
6705 | goto out_register_late_subsys; | |
6706 | ||
6707 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
6708 | inet6_rtm_delroute, NULL, 0); | |
6709 | if (ret < 0) | |
6710 | goto out_register_late_subsys; | |
6711 | ||
6712 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
6713 | inet6_rtm_getroute, NULL, | |
6714 | RTNL_FLAG_DOIT_UNLOCKED); | |
6715 | if (ret < 0) | |
d189634e | 6716 | goto out_register_late_subsys; |
c127ea2c | 6717 | |
8ed67789 | 6718 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 6719 | if (ret) |
d189634e | 6720 | goto out_register_late_subsys; |
8ed67789 | 6721 | |
138d0be3 YS |
6722 | #if IS_BUILTIN(CONFIG_IPV6) |
6723 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6724 | ret = bpf_iter_register(); | |
6725 | if (ret) | |
6726 | goto out_register_late_subsys; | |
6727 | #endif | |
6728 | #endif | |
6729 | ||
8d0b94af MKL |
6730 | for_each_possible_cpu(cpu) { |
6731 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
6732 | ||
6733 | INIT_LIST_HEAD(&ul->head); | |
ba55ef81 | 6734 | INIT_LIST_HEAD(&ul->quarantine); |
8d0b94af MKL |
6735 | spin_lock_init(&ul->lock); |
6736 | } | |
6737 | ||
433d49c3 DL |
6738 | out: |
6739 | return ret; | |
6740 | ||
d189634e | 6741 | out_register_late_subsys: |
16feebcf | 6742 | rtnl_unregister_all(PF_INET6); |
d189634e | 6743 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 6744 | fib6_rules_init: |
433d49c3 DL |
6745 | fib6_rules_cleanup(); |
6746 | xfrm6_init: | |
433d49c3 | 6747 | xfrm6_fini(); |
2a0c451a TG |
6748 | out_fib6_init: |
6749 | fib6_gc_cleanup(); | |
8ed67789 DL |
6750 | out_register_subsys: |
6751 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
6752 | out_register_inetpeer: |
6753 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
6754 | out_dst_entries: |
6755 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 6756 | out_kmem_cache: |
f2fc6a54 | 6757 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 6758 | goto out; |
1da177e4 LT |
6759 | } |
6760 | ||
6761 | void ip6_route_cleanup(void) | |
6762 | { | |
138d0be3 YS |
6763 | #if IS_BUILTIN(CONFIG_IPV6) |
6764 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6765 | bpf_iter_unregister(); | |
6766 | #endif | |
6767 | #endif | |
8ed67789 | 6768 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 6769 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 6770 | fib6_rules_cleanup(); |
1da177e4 | 6771 | xfrm6_fini(); |
1da177e4 | 6772 | fib6_gc_cleanup(); |
c3426b47 | 6773 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 6774 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 6775 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 6776 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 6777 | } |