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> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
904af04d | 54 | #include <net/dst_metadata.h> |
1da177e4 | 55 | #include <net/xfrm.h> |
8d71740c | 56 | #include <net/netevent.h> |
21713ebc | 57 | #include <net/netlink.h> |
3c618c1d | 58 | #include <net/rtnh.h> |
19e42e45 | 59 | #include <net/lwtunnel.h> |
904af04d | 60 | #include <net/ip_tunnels.h> |
ca254490 | 61 | #include <net/l3mdev.h> |
eacb9384 | 62 | #include <net/ip.h> |
7c0f6ba6 | 63 | #include <linux/uaccess.h> |
1da177e4 LT |
64 | |
65 | #ifdef CONFIG_SYSCTL | |
66 | #include <linux/sysctl.h> | |
67 | #endif | |
68 | ||
30d444d3 DA |
69 | static int ip6_rt_type_to_error(u8 fib6_type); |
70 | ||
71 | #define CREATE_TRACE_POINTS | |
72 | #include <trace/events/fib6.h> | |
73 | EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup); | |
74 | #undef CREATE_TRACE_POINTS | |
75 | ||
afc154e9 | 76 | enum rt6_nud_state { |
7e980569 JB |
77 | RT6_NUD_FAIL_HARD = -3, |
78 | RT6_NUD_FAIL_PROBE = -2, | |
79 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
80 | RT6_NUD_SUCCEED = 1 |
81 | }; | |
82 | ||
1da177e4 | 83 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 84 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 85 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
86 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
87 | static void ip6_dst_destroy(struct dst_entry *); | |
88 | static void ip6_dst_ifdown(struct dst_entry *, | |
89 | struct net_device *dev, int how); | |
569d3645 | 90 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
91 | |
92 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 93 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 94 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 95 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 96 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
97 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
98 | struct sk_buff *skb, u32 mtu); | |
99 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
100 | struct sk_buff *skb); | |
702cea56 DA |
101 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
102 | int strict); | |
a1b7a1f0 | 103 | static size_t rt6_nlmsg_size(struct fib6_info *f6i); |
d4ead6b3 | 104 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 105 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 106 | struct in6_addr *dest, struct in6_addr *src, |
16a16cd3 DA |
107 | int iif, int type, u32 portid, u32 seq, |
108 | unsigned int flags); | |
7e4b5128 | 109 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
110 | const struct in6_addr *daddr, |
111 | const struct in6_addr *saddr); | |
1da177e4 | 112 | |
70ceb4f5 | 113 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 114 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 115 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
116 | const struct in6_addr *gwaddr, |
117 | struct net_device *dev, | |
95c96174 | 118 | unsigned int pref); |
8d1c802b | 119 | static struct fib6_info *rt6_get_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); | |
70ceb4f5 YH |
123 | #endif |
124 | ||
8d0b94af MKL |
125 | struct uncached_list { |
126 | spinlock_t lock; | |
127 | struct list_head head; | |
128 | }; | |
129 | ||
130 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
131 | ||
510c321b | 132 | void rt6_uncached_list_add(struct rt6_info *rt) |
8d0b94af MKL |
133 | { |
134 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
135 | ||
8d0b94af MKL |
136 | rt->rt6i_uncached_list = ul; |
137 | ||
138 | spin_lock_bh(&ul->lock); | |
139 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
140 | spin_unlock_bh(&ul->lock); | |
141 | } | |
142 | ||
510c321b | 143 | void rt6_uncached_list_del(struct rt6_info *rt) |
8d0b94af MKL |
144 | { |
145 | if (!list_empty(&rt->rt6i_uncached)) { | |
146 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
81eb8447 | 147 | struct net *net = dev_net(rt->dst.dev); |
8d0b94af MKL |
148 | |
149 | spin_lock_bh(&ul->lock); | |
150 | list_del(&rt->rt6i_uncached); | |
81eb8447 | 151 | atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache); |
8d0b94af MKL |
152 | spin_unlock_bh(&ul->lock); |
153 | } | |
154 | } | |
155 | ||
156 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
157 | { | |
158 | struct net_device *loopback_dev = net->loopback_dev; | |
159 | int cpu; | |
160 | ||
e332bc67 EB |
161 | if (dev == loopback_dev) |
162 | return; | |
163 | ||
8d0b94af MKL |
164 | for_each_possible_cpu(cpu) { |
165 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
166 | struct rt6_info *rt; | |
167 | ||
168 | spin_lock_bh(&ul->lock); | |
169 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
170 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
171 | struct net_device *rt_dev = rt->dst.dev; | |
172 | ||
e332bc67 | 173 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
174 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
175 | in6_dev_put(rt_idev); | |
176 | } | |
177 | ||
e332bc67 | 178 | if (rt_dev == dev) { |
8d7017fd | 179 | rt->dst.dev = blackhole_netdev; |
8d0b94af MKL |
180 | dev_hold(rt->dst.dev); |
181 | dev_put(rt_dev); | |
182 | } | |
183 | } | |
184 | spin_unlock_bh(&ul->lock); | |
185 | } | |
186 | } | |
187 | ||
f8a1b43b | 188 | static inline const void *choose_neigh_daddr(const struct in6_addr *p, |
f894cbf8 DM |
189 | struct sk_buff *skb, |
190 | const void *daddr) | |
39232973 | 191 | { |
a7563f34 | 192 | if (!ipv6_addr_any(p)) |
39232973 | 193 | return (const void *) p; |
f894cbf8 DM |
194 | else if (skb) |
195 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
196 | return daddr; |
197 | } | |
198 | ||
f8a1b43b DA |
199 | struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
200 | struct net_device *dev, | |
201 | struct sk_buff *skb, | |
202 | const void *daddr) | |
d3aaeb38 | 203 | { |
39232973 DM |
204 | struct neighbour *n; |
205 | ||
f8a1b43b DA |
206 | daddr = choose_neigh_daddr(gw, skb, daddr); |
207 | n = __ipv6_neigh_lookup(dev, daddr); | |
f83c7790 DM |
208 | if (n) |
209 | return n; | |
7adf3246 SB |
210 | |
211 | n = neigh_create(&nd_tbl, daddr, dev); | |
212 | return IS_ERR(n) ? NULL : n; | |
f8a1b43b DA |
213 | } |
214 | ||
215 | static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst, | |
216 | struct sk_buff *skb, | |
217 | const void *daddr) | |
218 | { | |
219 | const struct rt6_info *rt = container_of(dst, struct rt6_info, dst); | |
220 | ||
2c6b55f4 ND |
221 | return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any), |
222 | dst->dev, skb, daddr); | |
f83c7790 DM |
223 | } |
224 | ||
63fca65d JA |
225 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
226 | { | |
227 | struct net_device *dev = dst->dev; | |
228 | struct rt6_info *rt = (struct rt6_info *)dst; | |
229 | ||
f8a1b43b | 230 | daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr); |
63fca65d JA |
231 | if (!daddr) |
232 | return; | |
233 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
234 | return; | |
235 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
236 | return; | |
237 | __ipv6_confirm_neigh(dev, daddr); | |
238 | } | |
239 | ||
9a7ec3a9 | 240 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 241 | .family = AF_INET6, |
1da177e4 LT |
242 | .gc = ip6_dst_gc, |
243 | .gc_thresh = 1024, | |
244 | .check = ip6_dst_check, | |
0dbaee3b | 245 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 246 | .mtu = ip6_mtu, |
d4ead6b3 | 247 | .cow_metrics = dst_cow_metrics_generic, |
1da177e4 LT |
248 | .destroy = ip6_dst_destroy, |
249 | .ifdown = ip6_dst_ifdown, | |
250 | .negative_advice = ip6_negative_advice, | |
251 | .link_failure = ip6_link_failure, | |
252 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 253 | .redirect = rt6_do_redirect, |
9f8955cc | 254 | .local_out = __ip6_local_out, |
f8a1b43b | 255 | .neigh_lookup = ip6_dst_neigh_lookup, |
63fca65d | 256 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
257 | }; |
258 | ||
ebb762f2 | 259 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 260 | { |
618f9bc7 SK |
261 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
262 | ||
263 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
264 | } |
265 | ||
6700c270 DM |
266 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
267 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
268 | { |
269 | } | |
270 | ||
6700c270 DM |
271 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
272 | struct sk_buff *skb) | |
b587ee3b DM |
273 | { |
274 | } | |
275 | ||
14e50e57 DM |
276 | static struct dst_ops ip6_dst_blackhole_ops = { |
277 | .family = AF_INET6, | |
14e50e57 DM |
278 | .destroy = ip6_dst_destroy, |
279 | .check = ip6_dst_check, | |
ebb762f2 | 280 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 281 | .default_advmss = ip6_default_advmss, |
14e50e57 | 282 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 283 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 284 | .cow_metrics = dst_cow_metrics_generic, |
f8a1b43b | 285 | .neigh_lookup = ip6_dst_neigh_lookup, |
14e50e57 DM |
286 | }; |
287 | ||
62fa8a84 | 288 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 289 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
290 | }; |
291 | ||
8d1c802b | 292 | static const struct fib6_info fib6_null_entry_template = { |
93c2fb25 DA |
293 | .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP), |
294 | .fib6_protocol = RTPROT_KERNEL, | |
295 | .fib6_metric = ~(u32)0, | |
f05713e0 | 296 | .fib6_ref = REFCOUNT_INIT(1), |
421842ed DA |
297 | .fib6_type = RTN_UNREACHABLE, |
298 | .fib6_metrics = (struct dst_metrics *)&dst_default_metrics, | |
299 | }; | |
300 | ||
fb0af4c7 | 301 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
302 | .dst = { |
303 | .__refcnt = ATOMIC_INIT(1), | |
304 | .__use = 1, | |
2c20cbd7 | 305 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 306 | .error = -ENETUNREACH, |
d8d1f30b CG |
307 | .input = ip6_pkt_discard, |
308 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
309 | }, |
310 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
1da177e4 LT |
311 | }; |
312 | ||
101367c2 TG |
313 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
314 | ||
fb0af4c7 | 315 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
316 | .dst = { |
317 | .__refcnt = ATOMIC_INIT(1), | |
318 | .__use = 1, | |
2c20cbd7 | 319 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 320 | .error = -EACCES, |
d8d1f30b CG |
321 | .input = ip6_pkt_prohibit, |
322 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
323 | }, |
324 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
325 | }; |
326 | ||
fb0af4c7 | 327 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
328 | .dst = { |
329 | .__refcnt = ATOMIC_INIT(1), | |
330 | .__use = 1, | |
2c20cbd7 | 331 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 332 | .error = -EINVAL, |
d8d1f30b | 333 | .input = dst_discard, |
ede2059d | 334 | .output = dst_discard_out, |
101367c2 TG |
335 | }, |
336 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
337 | }; |
338 | ||
339 | #endif | |
340 | ||
ebfa45f0 MKL |
341 | static void rt6_info_init(struct rt6_info *rt) |
342 | { | |
343 | struct dst_entry *dst = &rt->dst; | |
344 | ||
345 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
ebfa45f0 MKL |
346 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
347 | } | |
348 | ||
1da177e4 | 349 | /* allocate dst with ip6_dst_ops */ |
93531c67 DA |
350 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
351 | int flags) | |
1da177e4 | 352 | { |
97bab73f | 353 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
b2a9c0ed | 354 | 1, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 355 | |
81eb8447 | 356 | if (rt) { |
ebfa45f0 | 357 | rt6_info_init(rt); |
81eb8447 WW |
358 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
359 | } | |
8104891b | 360 | |
cf911662 | 361 | return rt; |
1da177e4 | 362 | } |
9ab179d8 | 363 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 364 | |
1da177e4 LT |
365 | static void ip6_dst_destroy(struct dst_entry *dst) |
366 | { | |
367 | struct rt6_info *rt = (struct rt6_info *)dst; | |
a68886a6 | 368 | struct fib6_info *from; |
8d0b94af | 369 | struct inet6_dev *idev; |
1da177e4 | 370 | |
1620a336 | 371 | ip_dst_metrics_put(dst); |
8d0b94af MKL |
372 | rt6_uncached_list_del(rt); |
373 | ||
374 | idev = rt->rt6i_idev; | |
38308473 | 375 | if (idev) { |
1da177e4 LT |
376 | rt->rt6i_idev = NULL; |
377 | in6_dev_put(idev); | |
1ab1457c | 378 | } |
1716a961 | 379 | |
0e233874 | 380 | from = xchg((__force struct fib6_info **)&rt->from, NULL); |
93531c67 | 381 | fib6_info_release(from); |
b3419363 DM |
382 | } |
383 | ||
1da177e4 LT |
384 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
385 | int how) | |
386 | { | |
387 | struct rt6_info *rt = (struct rt6_info *)dst; | |
388 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 389 | struct net_device *loopback_dev = |
c346dca1 | 390 | dev_net(dev)->loopback_dev; |
1da177e4 | 391 | |
e5645f51 WW |
392 | if (idev && idev->dev != loopback_dev) { |
393 | struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); | |
394 | if (loopback_idev) { | |
395 | rt->rt6i_idev = loopback_idev; | |
396 | in6_dev_put(idev); | |
97cac082 | 397 | } |
1da177e4 LT |
398 | } |
399 | } | |
400 | ||
5973fb1e MKL |
401 | static bool __rt6_check_expired(const struct rt6_info *rt) |
402 | { | |
403 | if (rt->rt6i_flags & RTF_EXPIRES) | |
404 | return time_after(jiffies, rt->dst.expires); | |
405 | else | |
406 | return false; | |
407 | } | |
408 | ||
a50feda5 | 409 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 410 | { |
a68886a6 DA |
411 | struct fib6_info *from; |
412 | ||
413 | from = rcu_dereference(rt->from); | |
414 | ||
1716a961 G |
415 | if (rt->rt6i_flags & RTF_EXPIRES) { |
416 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 417 | return true; |
a68886a6 | 418 | } else if (from) { |
1e2ea8ad | 419 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
a68886a6 | 420 | fib6_check_expired(from); |
1716a961 | 421 | } |
a50feda5 | 422 | return false; |
1da177e4 LT |
423 | } |
424 | ||
b1d40991 DA |
425 | void fib6_select_path(const struct net *net, struct fib6_result *res, |
426 | struct flowi6 *fl6, int oif, bool have_oif_match, | |
427 | const struct sk_buff *skb, int strict) | |
51ebd318 | 428 | { |
8d1c802b | 429 | struct fib6_info *sibling, *next_sibling; |
b1d40991 DA |
430 | struct fib6_info *match = res->f6i; |
431 | ||
f88d8ea6 | 432 | if ((!match->fib6_nsiblings && !match->nh) || have_oif_match) |
b1d40991 | 433 | goto out; |
51ebd318 | 434 | |
b673d6cc JS |
435 | /* We might have already computed the hash for ICMPv6 errors. In such |
436 | * case it will always be non-zero. Otherwise now is the time to do it. | |
437 | */ | |
f88d8ea6 DA |
438 | if (!fl6->mp_hash && |
439 | (!match->nh || nexthop_is_multipath(match->nh))) | |
b4bac172 | 440 | fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL); |
b673d6cc | 441 | |
f88d8ea6 DA |
442 | if (unlikely(match->nh)) { |
443 | nexthop_path_fib6_result(res, fl6->mp_hash); | |
444 | return; | |
445 | } | |
446 | ||
1cf844c7 | 447 | if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound)) |
b1d40991 | 448 | goto out; |
3d709f69 | 449 | |
93c2fb25 DA |
450 | list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings, |
451 | fib6_siblings) { | |
1cf844c7 | 452 | const struct fib6_nh *nh = sibling->fib6_nh; |
5e670d84 DA |
453 | int nh_upper_bound; |
454 | ||
702cea56 | 455 | nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound); |
5e670d84 | 456 | if (fl6->mp_hash > nh_upper_bound) |
3d709f69 | 457 | continue; |
702cea56 | 458 | if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0) |
3d709f69 IS |
459 | break; |
460 | match = sibling; | |
461 | break; | |
462 | } | |
463 | ||
b1d40991 DA |
464 | out: |
465 | res->f6i = match; | |
1cf844c7 | 466 | res->nh = match->fib6_nh; |
51ebd318 ND |
467 | } |
468 | ||
1da177e4 | 469 | /* |
66f5d6ce | 470 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
471 | */ |
472 | ||
0c59d006 DA |
473 | static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh, |
474 | const struct in6_addr *saddr, int oif, int flags) | |
475 | { | |
476 | const struct net_device *dev; | |
477 | ||
478 | if (nh->fib_nh_flags & RTNH_F_DEAD) | |
479 | return false; | |
480 | ||
481 | dev = nh->fib_nh_dev; | |
482 | if (oif) { | |
483 | if (dev->ifindex == oif) | |
484 | return true; | |
485 | } else { | |
486 | if (ipv6_chk_addr(net, saddr, dev, | |
487 | flags & RT6_LOOKUP_F_IFACE)) | |
488 | return true; | |
489 | } | |
490 | ||
491 | return false; | |
492 | } | |
493 | ||
962b6803 DA |
494 | struct fib6_nh_dm_arg { |
495 | struct net *net; | |
496 | const struct in6_addr *saddr; | |
497 | int oif; | |
498 | int flags; | |
499 | struct fib6_nh *nh; | |
500 | }; | |
501 | ||
502 | static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg) | |
503 | { | |
504 | struct fib6_nh_dm_arg *arg = _arg; | |
505 | ||
506 | arg->nh = nh; | |
507 | return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif, | |
508 | arg->flags); | |
509 | } | |
510 | ||
511 | /* returns fib6_nh from nexthop or NULL */ | |
512 | static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh, | |
513 | struct fib6_result *res, | |
514 | const struct in6_addr *saddr, | |
515 | int oif, int flags) | |
516 | { | |
517 | struct fib6_nh_dm_arg arg = { | |
518 | .net = net, | |
519 | .saddr = saddr, | |
520 | .oif = oif, | |
521 | .flags = flags, | |
522 | }; | |
523 | ||
524 | if (nexthop_is_blackhole(nh)) | |
525 | return NULL; | |
526 | ||
527 | if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg)) | |
528 | return arg.nh; | |
529 | ||
530 | return NULL; | |
531 | } | |
532 | ||
75ef7389 DA |
533 | static void rt6_device_match(struct net *net, struct fib6_result *res, |
534 | const struct in6_addr *saddr, int oif, int flags) | |
1da177e4 | 535 | { |
75ef7389 DA |
536 | struct fib6_info *f6i = res->f6i; |
537 | struct fib6_info *spf6i; | |
538 | struct fib6_nh *nh; | |
1da177e4 | 539 | |
75ef7389 | 540 | if (!oif && ipv6_addr_any(saddr)) { |
f88d8ea6 DA |
541 | if (unlikely(f6i->nh)) { |
542 | nh = nexthop_fib6_nh(f6i->nh); | |
543 | if (nexthop_is_blackhole(f6i->nh)) | |
544 | goto out_blackhole; | |
545 | } else { | |
546 | nh = f6i->fib6_nh; | |
547 | } | |
7d21fec9 DA |
548 | if (!(nh->fib_nh_flags & RTNH_F_DEAD)) |
549 | goto out; | |
75ef7389 | 550 | } |
dd3abc4e | 551 | |
75ef7389 | 552 | for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) { |
962b6803 DA |
553 | bool matched = false; |
554 | ||
555 | if (unlikely(spf6i->nh)) { | |
556 | nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr, | |
557 | oif, flags); | |
558 | if (nh) | |
559 | matched = true; | |
560 | } else { | |
561 | nh = spf6i->fib6_nh; | |
562 | if (__rt6_device_match(net, nh, saddr, oif, flags)) | |
563 | matched = true; | |
564 | } | |
565 | if (matched) { | |
75ef7389 | 566 | res->f6i = spf6i; |
7d21fec9 | 567 | goto out; |
75ef7389 | 568 | } |
dd3abc4e | 569 | } |
1da177e4 | 570 | |
75ef7389 DA |
571 | if (oif && flags & RT6_LOOKUP_F_IFACE) { |
572 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 573 | nh = res->f6i->fib6_nh; |
7d21fec9 | 574 | goto out; |
75ef7389 | 575 | } |
8067bb8c | 576 | |
f88d8ea6 DA |
577 | if (unlikely(f6i->nh)) { |
578 | nh = nexthop_fib6_nh(f6i->nh); | |
579 | if (nexthop_is_blackhole(f6i->nh)) | |
580 | goto out_blackhole; | |
581 | } else { | |
582 | nh = f6i->fib6_nh; | |
583 | } | |
584 | ||
7d21fec9 | 585 | if (nh->fib_nh_flags & RTNH_F_DEAD) { |
75ef7389 | 586 | res->f6i = net->ipv6.fib6_null_entry; |
1cf844c7 | 587 | nh = res->f6i->fib6_nh; |
75ef7389 | 588 | } |
7d21fec9 DA |
589 | out: |
590 | res->nh = nh; | |
591 | res->fib6_type = res->f6i->fib6_type; | |
592 | res->fib6_flags = res->f6i->fib6_flags; | |
f88d8ea6 DA |
593 | return; |
594 | ||
595 | out_blackhole: | |
596 | res->fib6_flags |= RTF_REJECT; | |
597 | res->fib6_type = RTN_BLACKHOLE; | |
598 | res->nh = nh; | |
1da177e4 LT |
599 | } |
600 | ||
27097255 | 601 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
602 | struct __rt6_probe_work { |
603 | struct work_struct work; | |
604 | struct in6_addr target; | |
605 | struct net_device *dev; | |
606 | }; | |
607 | ||
608 | static void rt6_probe_deferred(struct work_struct *w) | |
609 | { | |
610 | struct in6_addr mcaddr; | |
611 | struct __rt6_probe_work *work = | |
612 | container_of(w, struct __rt6_probe_work, work); | |
613 | ||
614 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 615 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 616 | dev_put(work->dev); |
662f5533 | 617 | kfree(work); |
c2f17e82 HFS |
618 | } |
619 | ||
cc3a86c8 | 620 | static void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 621 | { |
f547fac6 | 622 | struct __rt6_probe_work *work = NULL; |
5e670d84 | 623 | const struct in6_addr *nh_gw; |
f2c31e32 | 624 | struct neighbour *neigh; |
5e670d84 | 625 | struct net_device *dev; |
f547fac6 | 626 | struct inet6_dev *idev; |
5e670d84 | 627 | |
27097255 YH |
628 | /* |
629 | * Okay, this does not seem to be appropriate | |
630 | * for now, however, we need to check if it | |
631 | * is really so; aka Router Reachability Probing. | |
632 | * | |
633 | * Router Reachability Probe MUST be rate-limited | |
634 | * to no more than one per minute. | |
635 | */ | |
cc3a86c8 | 636 | if (fib6_nh->fib_nh_gw_family) |
7ff74a59 | 637 | return; |
5e670d84 | 638 | |
cc3a86c8 DA |
639 | nh_gw = &fib6_nh->fib_nh_gw6; |
640 | dev = fib6_nh->fib_nh_dev; | |
2152caea | 641 | rcu_read_lock_bh(); |
f547fac6 | 642 | idev = __in6_dev_get(dev); |
5e670d84 | 643 | neigh = __ipv6_neigh_lookup_noref(dev, nh_gw); |
2152caea | 644 | if (neigh) { |
8d6c31bf MKL |
645 | if (neigh->nud_state & NUD_VALID) |
646 | goto out; | |
647 | ||
2152caea | 648 | write_lock(&neigh->lock); |
990edb42 MKL |
649 | if (!(neigh->nud_state & NUD_VALID) && |
650 | time_after(jiffies, | |
dcd1f572 | 651 | neigh->updated + idev->cnf.rtr_probe_interval)) { |
990edb42 MKL |
652 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
653 | if (work) | |
654 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 655 | } |
2152caea | 656 | write_unlock(&neigh->lock); |
cc3a86c8 | 657 | } else if (time_after(jiffies, fib6_nh->last_probe + |
f547fac6 | 658 | idev->cnf.rtr_probe_interval)) { |
990edb42 | 659 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
f2c31e32 | 660 | } |
990edb42 MKL |
661 | |
662 | if (work) { | |
cc3a86c8 | 663 | fib6_nh->last_probe = jiffies; |
990edb42 | 664 | INIT_WORK(&work->work, rt6_probe_deferred); |
5e670d84 DA |
665 | work->target = *nh_gw; |
666 | dev_hold(dev); | |
667 | work->dev = dev; | |
990edb42 MKL |
668 | schedule_work(&work->work); |
669 | } | |
670 | ||
8d6c31bf | 671 | out: |
2152caea | 672 | rcu_read_unlock_bh(); |
27097255 YH |
673 | } |
674 | #else | |
cc3a86c8 | 675 | static inline void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 676 | { |
27097255 YH |
677 | } |
678 | #endif | |
679 | ||
1da177e4 | 680 | /* |
554cfb7e | 681 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 682 | */ |
1ba9a895 | 683 | static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh) |
1da177e4 | 684 | { |
afc154e9 | 685 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
5e670d84 | 686 | struct neighbour *neigh; |
f2c31e32 | 687 | |
145a3621 | 688 | rcu_read_lock_bh(); |
1ba9a895 DA |
689 | neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev, |
690 | &fib6_nh->fib_nh_gw6); | |
145a3621 YH |
691 | if (neigh) { |
692 | read_lock(&neigh->lock); | |
554cfb7e | 693 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 694 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 695 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 696 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 697 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
698 | else |
699 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 700 | #endif |
145a3621 | 701 | read_unlock(&neigh->lock); |
afc154e9 HFS |
702 | } else { |
703 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 704 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 705 | } |
145a3621 YH |
706 | rcu_read_unlock_bh(); |
707 | ||
a5a81f0b | 708 | return ret; |
1da177e4 LT |
709 | } |
710 | ||
702cea56 DA |
711 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
712 | int strict) | |
1da177e4 | 713 | { |
6e1809a5 DA |
714 | int m = 0; |
715 | ||
716 | if (!oif || nh->fib_nh_dev->ifindex == oif) | |
717 | m = 2; | |
1ab1457c | 718 | |
77d16f45 | 719 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 720 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 | 721 | #ifdef CONFIG_IPV6_ROUTER_PREF |
702cea56 | 722 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2; |
ebacaaa0 | 723 | #endif |
1ba9a895 | 724 | if ((strict & RT6_LOOKUP_F_REACHABLE) && |
702cea56 | 725 | !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) { |
1ba9a895 | 726 | int n = rt6_check_neigh(nh); |
afc154e9 HFS |
727 | if (n < 0) |
728 | return n; | |
729 | } | |
554cfb7e YH |
730 | return m; |
731 | } | |
732 | ||
28679ed1 DA |
733 | static bool find_match(struct fib6_nh *nh, u32 fib6_flags, |
734 | int oif, int strict, int *mpri, bool *do_rr) | |
554cfb7e | 735 | { |
afc154e9 | 736 | bool match_do_rr = false; |
28679ed1 DA |
737 | bool rc = false; |
738 | int m; | |
35103d11 | 739 | |
28679ed1 | 740 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
8067bb8c IS |
741 | goto out; |
742 | ||
28679ed1 DA |
743 | if (ip6_ignore_linkdown(nh->fib_nh_dev) && |
744 | nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
d5d32e4b | 745 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) |
35103d11 | 746 | goto out; |
f11e6659 | 747 | |
28679ed1 | 748 | m = rt6_score_route(nh, fib6_flags, oif, strict); |
7e980569 | 749 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
750 | match_do_rr = true; |
751 | m = 0; /* lowest valid score */ | |
7e980569 | 752 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 753 | goto out; |
afc154e9 HFS |
754 | } |
755 | ||
756 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
28679ed1 | 757 | rt6_probe(nh); |
f11e6659 | 758 | |
7e980569 | 759 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 760 | if (m > *mpri) { |
afc154e9 | 761 | *do_rr = match_do_rr; |
f11e6659 | 762 | *mpri = m; |
28679ed1 | 763 | rc = true; |
f11e6659 | 764 | } |
f11e6659 | 765 | out: |
28679ed1 | 766 | return rc; |
f11e6659 DM |
767 | } |
768 | ||
17a5984e DA |
769 | struct fib6_nh_frl_arg { |
770 | u32 flags; | |
771 | int oif; | |
772 | int strict; | |
773 | int *mpri; | |
774 | bool *do_rr; | |
775 | struct fib6_nh *nh; | |
776 | }; | |
777 | ||
778 | static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
779 | { | |
780 | struct fib6_nh_frl_arg *arg = _arg; | |
781 | ||
782 | arg->nh = nh; | |
783 | return find_match(nh, arg->flags, arg->oif, arg->strict, | |
784 | arg->mpri, arg->do_rr); | |
785 | } | |
786 | ||
b7bc4b6a | 787 | static void __find_rr_leaf(struct fib6_info *f6i_start, |
30c15f03 | 788 | struct fib6_info *nomatch, u32 metric, |
b7bc4b6a | 789 | struct fib6_result *res, struct fib6_info **cont, |
30c15f03 | 790 | int oif, int strict, bool *do_rr, int *mpri) |
f11e6659 | 791 | { |
b7bc4b6a | 792 | struct fib6_info *f6i; |
1da177e4 | 793 | |
b7bc4b6a DA |
794 | for (f6i = f6i_start; |
795 | f6i && f6i != nomatch; | |
796 | f6i = rcu_dereference(f6i->fib6_next)) { | |
17a5984e | 797 | bool matched = false; |
30c15f03 DA |
798 | struct fib6_nh *nh; |
799 | ||
b7bc4b6a DA |
800 | if (cont && f6i->fib6_metric != metric) { |
801 | *cont = f6i; | |
30c15f03 | 802 | return; |
9fbdcfaf SK |
803 | } |
804 | ||
b7bc4b6a | 805 | if (fib6_check_expired(f6i)) |
28679ed1 DA |
806 | continue; |
807 | ||
17a5984e DA |
808 | if (unlikely(f6i->nh)) { |
809 | struct fib6_nh_frl_arg arg = { | |
810 | .flags = f6i->fib6_flags, | |
811 | .oif = oif, | |
812 | .strict = strict, | |
813 | .mpri = mpri, | |
814 | .do_rr = do_rr | |
815 | }; | |
816 | ||
817 | if (nexthop_is_blackhole(f6i->nh)) { | |
818 | res->fib6_flags = RTF_REJECT; | |
819 | res->fib6_type = RTN_BLACKHOLE; | |
820 | res->f6i = f6i; | |
821 | res->nh = nexthop_fib6_nh(f6i->nh); | |
822 | return; | |
823 | } | |
824 | if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match, | |
825 | &arg)) { | |
826 | matched = true; | |
827 | nh = arg.nh; | |
828 | } | |
829 | } else { | |
830 | nh = f6i->fib6_nh; | |
831 | if (find_match(nh, f6i->fib6_flags, oif, strict, | |
832 | mpri, do_rr)) | |
833 | matched = true; | |
834 | } | |
835 | if (matched) { | |
b7bc4b6a DA |
836 | res->f6i = f6i; |
837 | res->nh = nh; | |
7d21fec9 DA |
838 | res->fib6_flags = f6i->fib6_flags; |
839 | res->fib6_type = f6i->fib6_type; | |
b7bc4b6a | 840 | } |
9fbdcfaf | 841 | } |
30c15f03 | 842 | } |
9fbdcfaf | 843 | |
b7bc4b6a DA |
844 | static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf, |
845 | struct fib6_info *rr_head, int oif, int strict, | |
846 | bool *do_rr, struct fib6_result *res) | |
30c15f03 | 847 | { |
b7bc4b6a DA |
848 | u32 metric = rr_head->fib6_metric; |
849 | struct fib6_info *cont = NULL; | |
30c15f03 | 850 | int mpri = -1; |
9fbdcfaf | 851 | |
b7bc4b6a | 852 | __find_rr_leaf(rr_head, NULL, metric, res, &cont, |
30c15f03 | 853 | oif, strict, do_rr, &mpri); |
28679ed1 | 854 | |
b7bc4b6a | 855 | __find_rr_leaf(leaf, rr_head, metric, res, &cont, |
30c15f03 | 856 | oif, strict, do_rr, &mpri); |
9fbdcfaf | 857 | |
b7bc4b6a DA |
858 | if (res->f6i || !cont) |
859 | return; | |
9fbdcfaf | 860 | |
b7bc4b6a | 861 | __find_rr_leaf(cont, NULL, metric, res, NULL, |
30c15f03 | 862 | oif, strict, do_rr, &mpri); |
f11e6659 | 863 | } |
1da177e4 | 864 | |
b7bc4b6a DA |
865 | static void rt6_select(struct net *net, struct fib6_node *fn, int oif, |
866 | struct fib6_result *res, int strict) | |
f11e6659 | 867 | { |
8d1c802b | 868 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
b7bc4b6a | 869 | struct fib6_info *rt0; |
afc154e9 | 870 | bool do_rr = false; |
17ecf590 | 871 | int key_plen; |
1da177e4 | 872 | |
b7bc4b6a DA |
873 | /* make sure this function or its helpers sets f6i */ |
874 | res->f6i = NULL; | |
875 | ||
421842ed | 876 | if (!leaf || leaf == net->ipv6.fib6_null_entry) |
b7bc4b6a | 877 | goto out; |
8d1040e8 | 878 | |
66f5d6ce | 879 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 880 | if (!rt0) |
66f5d6ce | 881 | rt0 = leaf; |
1da177e4 | 882 | |
17ecf590 WW |
883 | /* Double check to make sure fn is not an intermediate node |
884 | * and fn->leaf does not points to its child's leaf | |
885 | * (This might happen if all routes under fn are deleted from | |
886 | * the tree and fib6_repair_tree() is called on the node.) | |
887 | */ | |
93c2fb25 | 888 | key_plen = rt0->fib6_dst.plen; |
17ecf590 | 889 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
890 | if (rt0->fib6_src.plen) |
891 | key_plen = rt0->fib6_src.plen; | |
17ecf590 WW |
892 | #endif |
893 | if (fn->fn_bit != key_plen) | |
b7bc4b6a | 894 | goto out; |
1da177e4 | 895 | |
b7bc4b6a | 896 | find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res); |
afc154e9 | 897 | if (do_rr) { |
8fb11a9a | 898 | struct fib6_info *next = rcu_dereference(rt0->fib6_next); |
f11e6659 | 899 | |
554cfb7e | 900 | /* no entries matched; do round-robin */ |
93c2fb25 | 901 | if (!next || next->fib6_metric != rt0->fib6_metric) |
8d1040e8 | 902 | next = leaf; |
f11e6659 | 903 | |
66f5d6ce | 904 | if (next != rt0) { |
93c2fb25 | 905 | spin_lock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 906 | /* make sure next is not being deleted from the tree */ |
93c2fb25 | 907 | if (next->fib6_node) |
66f5d6ce | 908 | rcu_assign_pointer(fn->rr_ptr, next); |
93c2fb25 | 909 | spin_unlock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 910 | } |
1da177e4 | 911 | } |
1da177e4 | 912 | |
b7bc4b6a DA |
913 | out: |
914 | if (!res->f6i) { | |
915 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 916 | res->nh = res->f6i->fib6_nh; |
7d21fec9 DA |
917 | res->fib6_flags = res->f6i->fib6_flags; |
918 | res->fib6_type = res->f6i->fib6_type; | |
b7bc4b6a | 919 | } |
1da177e4 LT |
920 | } |
921 | ||
85bd05de | 922 | static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res) |
8b9df265 | 923 | { |
85bd05de DA |
924 | return (res->f6i->fib6_flags & RTF_NONEXTHOP) || |
925 | res->nh->fib_nh_gw_family; | |
8b9df265 MKL |
926 | } |
927 | ||
70ceb4f5 YH |
928 | #ifdef CONFIG_IPV6_ROUTE_INFO |
929 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 930 | const struct in6_addr *gwaddr) |
70ceb4f5 | 931 | { |
c346dca1 | 932 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
933 | struct route_info *rinfo = (struct route_info *) opt; |
934 | struct in6_addr prefix_buf, *prefix; | |
935 | unsigned int pref; | |
4bed72e4 | 936 | unsigned long lifetime; |
8d1c802b | 937 | struct fib6_info *rt; |
70ceb4f5 YH |
938 | |
939 | if (len < sizeof(struct route_info)) { | |
940 | return -EINVAL; | |
941 | } | |
942 | ||
943 | /* Sanity check for prefix_len and length */ | |
944 | if (rinfo->length > 3) { | |
945 | return -EINVAL; | |
946 | } else if (rinfo->prefix_len > 128) { | |
947 | return -EINVAL; | |
948 | } else if (rinfo->prefix_len > 64) { | |
949 | if (rinfo->length < 2) { | |
950 | return -EINVAL; | |
951 | } | |
952 | } else if (rinfo->prefix_len > 0) { | |
953 | if (rinfo->length < 1) { | |
954 | return -EINVAL; | |
955 | } | |
956 | } | |
957 | ||
958 | pref = rinfo->route_pref; | |
959 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 960 | return -EINVAL; |
70ceb4f5 | 961 | |
4bed72e4 | 962 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
963 | |
964 | if (rinfo->length == 3) | |
965 | prefix = (struct in6_addr *)rinfo->prefix; | |
966 | else { | |
967 | /* this function is safe */ | |
968 | ipv6_addr_prefix(&prefix_buf, | |
969 | (struct in6_addr *)rinfo->prefix, | |
970 | rinfo->prefix_len); | |
971 | prefix = &prefix_buf; | |
972 | } | |
973 | ||
f104a567 | 974 | if (rinfo->prefix_len == 0) |
afb1d4b5 | 975 | rt = rt6_get_dflt_router(net, gwaddr, dev); |
f104a567 DJ |
976 | else |
977 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 978 | gwaddr, dev); |
70ceb4f5 YH |
979 | |
980 | if (rt && !lifetime) { | |
afb1d4b5 | 981 | ip6_del_rt(net, rt); |
70ceb4f5 YH |
982 | rt = NULL; |
983 | } | |
984 | ||
985 | if (!rt && lifetime) | |
830218c1 DA |
986 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
987 | dev, pref); | |
70ceb4f5 | 988 | else if (rt) |
93c2fb25 DA |
989 | rt->fib6_flags = RTF_ROUTEINFO | |
990 | (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
70ceb4f5 YH |
991 | |
992 | if (rt) { | |
1716a961 | 993 | if (!addrconf_finite_timeout(lifetime)) |
14895687 | 994 | fib6_clean_expires(rt); |
1716a961 | 995 | else |
14895687 | 996 | fib6_set_expires(rt, jiffies + HZ * lifetime); |
1716a961 | 997 | |
93531c67 | 998 | fib6_info_release(rt); |
70ceb4f5 YH |
999 | } |
1000 | return 0; | |
1001 | } | |
1002 | #endif | |
1003 | ||
ae90d867 DA |
1004 | /* |
1005 | * Misc support functions | |
1006 | */ | |
1007 | ||
1008 | /* called with rcu_lock held */ | |
0d161581 | 1009 | static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res) |
ae90d867 | 1010 | { |
0d161581 | 1011 | struct net_device *dev = res->nh->fib_nh_dev; |
ae90d867 | 1012 | |
7d21fec9 | 1013 | if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
ae90d867 DA |
1014 | /* for copies of local routes, dst->dev needs to be the |
1015 | * device if it is a master device, the master device if | |
1016 | * device is enslaved, and the loopback as the default | |
1017 | */ | |
1018 | if (netif_is_l3_slave(dev) && | |
7d21fec9 | 1019 | !rt6_need_strict(&res->f6i->fib6_dst.addr)) |
ae90d867 DA |
1020 | dev = l3mdev_master_dev_rcu(dev); |
1021 | else if (!netif_is_l3_master(dev)) | |
1022 | dev = dev_net(dev)->loopback_dev; | |
1023 | /* last case is netif_is_l3_master(dev) is true in which | |
1024 | * case we want dev returned to be dev | |
1025 | */ | |
1026 | } | |
1027 | ||
1028 | return dev; | |
1029 | } | |
1030 | ||
6edb3c96 DA |
1031 | static const int fib6_prop[RTN_MAX + 1] = { |
1032 | [RTN_UNSPEC] = 0, | |
1033 | [RTN_UNICAST] = 0, | |
1034 | [RTN_LOCAL] = 0, | |
1035 | [RTN_BROADCAST] = 0, | |
1036 | [RTN_ANYCAST] = 0, | |
1037 | [RTN_MULTICAST] = 0, | |
1038 | [RTN_BLACKHOLE] = -EINVAL, | |
1039 | [RTN_UNREACHABLE] = -EHOSTUNREACH, | |
1040 | [RTN_PROHIBIT] = -EACCES, | |
1041 | [RTN_THROW] = -EAGAIN, | |
1042 | [RTN_NAT] = -EINVAL, | |
1043 | [RTN_XRESOLVE] = -EINVAL, | |
1044 | }; | |
1045 | ||
1046 | static int ip6_rt_type_to_error(u8 fib6_type) | |
1047 | { | |
1048 | return fib6_prop[fib6_type]; | |
1049 | } | |
1050 | ||
8d1c802b | 1051 | static unsigned short fib6_info_dst_flags(struct fib6_info *rt) |
3b6761d1 DA |
1052 | { |
1053 | unsigned short flags = 0; | |
1054 | ||
1055 | if (rt->dst_nocount) | |
1056 | flags |= DST_NOCOUNT; | |
1057 | if (rt->dst_nopolicy) | |
1058 | flags |= DST_NOPOLICY; | |
1059 | if (rt->dst_host) | |
1060 | flags |= DST_HOST; | |
1061 | ||
1062 | return flags; | |
1063 | } | |
1064 | ||
7d21fec9 | 1065 | static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) |
6edb3c96 | 1066 | { |
7d21fec9 | 1067 | rt->dst.error = ip6_rt_type_to_error(fib6_type); |
6edb3c96 | 1068 | |
7d21fec9 | 1069 | switch (fib6_type) { |
6edb3c96 DA |
1070 | case RTN_BLACKHOLE: |
1071 | rt->dst.output = dst_discard_out; | |
1072 | rt->dst.input = dst_discard; | |
1073 | break; | |
1074 | case RTN_PROHIBIT: | |
1075 | rt->dst.output = ip6_pkt_prohibit_out; | |
1076 | rt->dst.input = ip6_pkt_prohibit; | |
1077 | break; | |
1078 | case RTN_THROW: | |
1079 | case RTN_UNREACHABLE: | |
1080 | default: | |
1081 | rt->dst.output = ip6_pkt_discard_out; | |
1082 | rt->dst.input = ip6_pkt_discard; | |
1083 | break; | |
1084 | } | |
1085 | } | |
1086 | ||
0d161581 | 1087 | static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res) |
6edb3c96 | 1088 | { |
7d21fec9 | 1089 | struct fib6_info *f6i = res->f6i; |
0d161581 | 1090 | |
7d21fec9 DA |
1091 | if (res->fib6_flags & RTF_REJECT) { |
1092 | ip6_rt_init_dst_reject(rt, res->fib6_type); | |
6edb3c96 DA |
1093 | return; |
1094 | } | |
1095 | ||
1096 | rt->dst.error = 0; | |
1097 | rt->dst.output = ip6_output; | |
1098 | ||
7d21fec9 | 1099 | if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) { |
6edb3c96 | 1100 | rt->dst.input = ip6_input; |
7d21fec9 | 1101 | } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) { |
6edb3c96 DA |
1102 | rt->dst.input = ip6_mc_input; |
1103 | } else { | |
1104 | rt->dst.input = ip6_forward; | |
1105 | } | |
1106 | ||
0d161581 DA |
1107 | if (res->nh->fib_nh_lws) { |
1108 | rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws); | |
6edb3c96 DA |
1109 | lwtunnel_set_redirect(&rt->dst); |
1110 | } | |
1111 | ||
1112 | rt->dst.lastuse = jiffies; | |
1113 | } | |
1114 | ||
e873e4b9 | 1115 | /* Caller must already hold reference to @from */ |
8d1c802b | 1116 | static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) |
ae90d867 | 1117 | { |
ae90d867 | 1118 | rt->rt6i_flags &= ~RTF_EXPIRES; |
a68886a6 | 1119 | rcu_assign_pointer(rt->from, from); |
e1255ed4 | 1120 | ip_dst_init_metrics(&rt->dst, from->fib6_metrics); |
ae90d867 DA |
1121 | } |
1122 | ||
0d161581 DA |
1123 | /* Caller must already hold reference to f6i in result */ |
1124 | static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res) | |
ae90d867 | 1125 | { |
0d161581 DA |
1126 | const struct fib6_nh *nh = res->nh; |
1127 | const struct net_device *dev = nh->fib_nh_dev; | |
1128 | struct fib6_info *f6i = res->f6i; | |
dcd1f572 | 1129 | |
0d161581 | 1130 | ip6_rt_init_dst(rt, res); |
6edb3c96 | 1131 | |
0d161581 | 1132 | rt->rt6i_dst = f6i->fib6_dst; |
dcd1f572 | 1133 | rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; |
7d21fec9 | 1134 | rt->rt6i_flags = res->fib6_flags; |
0d161581 DA |
1135 | if (nh->fib_nh_gw_family) { |
1136 | rt->rt6i_gateway = nh->fib_nh_gw6; | |
2b2450ca DA |
1137 | rt->rt6i_flags |= RTF_GATEWAY; |
1138 | } | |
0d161581 | 1139 | rt6_set_from(rt, f6i); |
ae90d867 | 1140 | #ifdef CONFIG_IPV6_SUBTREES |
0d161581 | 1141 | rt->rt6i_src = f6i->fib6_src; |
ae90d867 | 1142 | #endif |
ae90d867 DA |
1143 | } |
1144 | ||
a3c00e46 MKL |
1145 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
1146 | struct in6_addr *saddr) | |
1147 | { | |
66f5d6ce | 1148 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
1149 | while (1) { |
1150 | if (fn->fn_flags & RTN_TL_ROOT) | |
1151 | return NULL; | |
66f5d6ce WW |
1152 | pn = rcu_dereference(fn->parent); |
1153 | sn = FIB6_SUBTREE(pn); | |
1154 | if (sn && sn != fn) | |
6454743b | 1155 | fn = fib6_node_lookup(sn, NULL, saddr); |
a3c00e46 MKL |
1156 | else |
1157 | fn = pn; | |
1158 | if (fn->fn_flags & RTN_RTINFO) | |
1159 | return fn; | |
1160 | } | |
1161 | } | |
c71099ac | 1162 | |
10585b43 | 1163 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt) |
d3843fe5 WW |
1164 | { |
1165 | struct rt6_info *rt = *prt; | |
1166 | ||
1167 | if (dst_hold_safe(&rt->dst)) | |
1168 | return true; | |
10585b43 | 1169 | if (net) { |
d3843fe5 WW |
1170 | rt = net->ipv6.ip6_null_entry; |
1171 | dst_hold(&rt->dst); | |
1172 | } else { | |
1173 | rt = NULL; | |
1174 | } | |
1175 | *prt = rt; | |
1176 | return false; | |
1177 | } | |
1178 | ||
dec9b0e2 | 1179 | /* called with rcu_lock held */ |
9b6b35ab | 1180 | static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res) |
dec9b0e2 | 1181 | { |
9b6b35ab DA |
1182 | struct net_device *dev = res->nh->fib_nh_dev; |
1183 | struct fib6_info *f6i = res->f6i; | |
1184 | unsigned short flags; | |
dec9b0e2 DA |
1185 | struct rt6_info *nrt; |
1186 | ||
9b6b35ab | 1187 | if (!fib6_info_hold_safe(f6i)) |
1c87e79a | 1188 | goto fallback; |
e873e4b9 | 1189 | |
9b6b35ab | 1190 | flags = fib6_info_dst_flags(f6i); |
93531c67 | 1191 | nrt = ip6_dst_alloc(dev_net(dev), dev, flags); |
1c87e79a | 1192 | if (!nrt) { |
9b6b35ab | 1193 | fib6_info_release(f6i); |
1c87e79a XL |
1194 | goto fallback; |
1195 | } | |
dec9b0e2 | 1196 | |
0d161581 | 1197 | ip6_rt_copy_init(nrt, res); |
1c87e79a XL |
1198 | return nrt; |
1199 | ||
1200 | fallback: | |
1201 | nrt = dev_net(dev)->ipv6.ip6_null_entry; | |
1202 | dst_hold(&nrt->dst); | |
dec9b0e2 DA |
1203 | return nrt; |
1204 | } | |
1205 | ||
8ed67789 DL |
1206 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
1207 | struct fib6_table *table, | |
b75cc8f9 DA |
1208 | struct flowi6 *fl6, |
1209 | const struct sk_buff *skb, | |
1210 | int flags) | |
1da177e4 | 1211 | { |
b1d40991 | 1212 | struct fib6_result res = {}; |
1da177e4 | 1213 | struct fib6_node *fn; |
23fb93a4 | 1214 | struct rt6_info *rt; |
1da177e4 | 1215 | |
b6cdbc85 DA |
1216 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1217 | flags &= ~RT6_LOOKUP_F_IFACE; | |
1218 | ||
66f5d6ce | 1219 | rcu_read_lock(); |
6454743b | 1220 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 1221 | restart: |
b1d40991 DA |
1222 | res.f6i = rcu_dereference(fn->leaf); |
1223 | if (!res.f6i) | |
1224 | res.f6i = net->ipv6.fib6_null_entry; | |
af52a52c | 1225 | else |
75ef7389 DA |
1226 | rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif, |
1227 | flags); | |
af52a52c | 1228 | |
b1d40991 | 1229 | if (res.f6i == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
1230 | fn = fib6_backtrack(fn, &fl6->saddr); |
1231 | if (fn) | |
1232 | goto restart; | |
2b760fcf | 1233 | |
af52a52c DA |
1234 | rt = net->ipv6.ip6_null_entry; |
1235 | dst_hold(&rt->dst); | |
1236 | goto out; | |
f88d8ea6 DA |
1237 | } else if (res.fib6_flags & RTF_REJECT) { |
1238 | goto do_create; | |
af52a52c | 1239 | } |
d3843fe5 | 1240 | |
b1d40991 DA |
1241 | fib6_select_path(net, &res, fl6, fl6->flowi6_oif, |
1242 | fl6->flowi6_oif != 0, skb, flags); | |
1243 | ||
2b760fcf | 1244 | /* Search through exception table */ |
7e4b5128 | 1245 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 1246 | if (rt) { |
10585b43 | 1247 | if (ip6_hold_safe(net, &rt)) |
dec9b0e2 | 1248 | dst_use_noref(&rt->dst, jiffies); |
23fb93a4 | 1249 | } else { |
f88d8ea6 | 1250 | do_create: |
9b6b35ab | 1251 | rt = ip6_create_rt_rcu(&res); |
dec9b0e2 | 1252 | } |
b811580d | 1253 | |
af52a52c | 1254 | out: |
8ff2e5b2 | 1255 | trace_fib6_table_lookup(net, &res, table, fl6); |
af52a52c | 1256 | |
66f5d6ce | 1257 | rcu_read_unlock(); |
b811580d | 1258 | |
c71099ac | 1259 | return rt; |
c71099ac TG |
1260 | } |
1261 | ||
67ba4152 | 1262 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 1263 | const struct sk_buff *skb, int flags) |
ea6e574e | 1264 | { |
b75cc8f9 | 1265 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup); |
ea6e574e FW |
1266 | } |
1267 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
1268 | ||
9acd9f3a | 1269 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
1270 | const struct in6_addr *saddr, int oif, |
1271 | const struct sk_buff *skb, int strict) | |
c71099ac | 1272 | { |
4c9483b2 DM |
1273 | struct flowi6 fl6 = { |
1274 | .flowi6_oif = oif, | |
1275 | .daddr = *daddr, | |
c71099ac TG |
1276 | }; |
1277 | struct dst_entry *dst; | |
77d16f45 | 1278 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 1279 | |
adaa70bb | 1280 | if (saddr) { |
4c9483b2 | 1281 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
1282 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1283 | } | |
1284 | ||
b75cc8f9 | 1285 | dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup); |
c71099ac TG |
1286 | if (dst->error == 0) |
1287 | return (struct rt6_info *) dst; | |
1288 | ||
1289 | dst_release(dst); | |
1290 | ||
1da177e4 LT |
1291 | return NULL; |
1292 | } | |
7159039a YH |
1293 | EXPORT_SYMBOL(rt6_lookup); |
1294 | ||
c71099ac | 1295 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
1296 | * It takes new route entry, the addition fails by any reason the |
1297 | * route is released. | |
1298 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1299 | */ |
1300 | ||
8d1c802b | 1301 | static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info, |
333c4301 | 1302 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1303 | { |
1304 | int err; | |
c71099ac | 1305 | struct fib6_table *table; |
1da177e4 | 1306 | |
93c2fb25 | 1307 | table = rt->fib6_table; |
66f5d6ce | 1308 | spin_lock_bh(&table->tb6_lock); |
d4ead6b3 | 1309 | err = fib6_add(&table->tb6_root, rt, info, extack); |
66f5d6ce | 1310 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1311 | |
1312 | return err; | |
1313 | } | |
1314 | ||
8d1c802b | 1315 | int ip6_ins_rt(struct net *net, struct fib6_info *rt) |
40e22e8f | 1316 | { |
afb1d4b5 | 1317 | struct nl_info info = { .nl_net = net, }; |
e715b6d3 | 1318 | |
d4ead6b3 | 1319 | return __ip6_ins_rt(rt, &info, NULL); |
40e22e8f TG |
1320 | } |
1321 | ||
85bd05de | 1322 | static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, |
8b9df265 MKL |
1323 | const struct in6_addr *daddr, |
1324 | const struct in6_addr *saddr) | |
1da177e4 | 1325 | { |
85bd05de | 1326 | struct fib6_info *f6i = res->f6i; |
4832c30d | 1327 | struct net_device *dev; |
1da177e4 LT |
1328 | struct rt6_info *rt; |
1329 | ||
1330 | /* | |
1331 | * Clone the route. | |
1332 | */ | |
1333 | ||
85bd05de | 1334 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1335 | return NULL; |
1336 | ||
0d161581 | 1337 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1338 | rt = ip6_dst_alloc(dev_net(dev), dev, 0); |
e873e4b9 | 1339 | if (!rt) { |
85bd05de | 1340 | fib6_info_release(f6i); |
83a09abd | 1341 | return NULL; |
e873e4b9 | 1342 | } |
83a09abd | 1343 | |
0d161581 | 1344 | ip6_rt_copy_init(rt, res); |
83a09abd | 1345 | rt->rt6i_flags |= RTF_CACHE; |
83a09abd MKL |
1346 | rt->dst.flags |= DST_HOST; |
1347 | rt->rt6i_dst.addr = *daddr; | |
1348 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1349 | |
85bd05de DA |
1350 | if (!rt6_is_gw_or_nonexthop(res)) { |
1351 | if (f6i->fib6_dst.plen != 128 && | |
1352 | ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) | |
83a09abd | 1353 | rt->rt6i_flags |= RTF_ANYCAST; |
1da177e4 | 1354 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1355 | if (rt->rt6i_src.plen && saddr) { |
1356 | rt->rt6i_src.addr = *saddr; | |
1357 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1358 | } |
83a09abd | 1359 | #endif |
95a9a5ba | 1360 | } |
1da177e4 | 1361 | |
95a9a5ba YH |
1362 | return rt; |
1363 | } | |
1da177e4 | 1364 | |
db3fedee | 1365 | static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res) |
d52d3997 | 1366 | { |
db3fedee DA |
1367 | struct fib6_info *f6i = res->f6i; |
1368 | unsigned short flags = fib6_info_dst_flags(f6i); | |
4832c30d | 1369 | struct net_device *dev; |
d52d3997 MKL |
1370 | struct rt6_info *pcpu_rt; |
1371 | ||
db3fedee | 1372 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1373 | return NULL; |
1374 | ||
4832c30d | 1375 | rcu_read_lock(); |
0d161581 | 1376 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1377 | pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags); |
4832c30d | 1378 | rcu_read_unlock(); |
e873e4b9 | 1379 | if (!pcpu_rt) { |
db3fedee | 1380 | fib6_info_release(f6i); |
d52d3997 | 1381 | return NULL; |
e873e4b9 | 1382 | } |
0d161581 | 1383 | ip6_rt_copy_init(pcpu_rt, res); |
d52d3997 MKL |
1384 | pcpu_rt->rt6i_flags |= RTF_PCPU; |
1385 | return pcpu_rt; | |
1386 | } | |
1387 | ||
66f5d6ce | 1388 | /* It should be called with rcu_read_lock() acquired */ |
db3fedee | 1389 | static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res) |
d52d3997 | 1390 | { |
c353071a | 1391 | struct rt6_info *pcpu_rt; |
d52d3997 | 1392 | |
c353071a | 1393 | pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu); |
d52d3997 | 1394 | |
a73e4195 MKL |
1395 | return pcpu_rt; |
1396 | } | |
1397 | ||
afb1d4b5 | 1398 | static struct rt6_info *rt6_make_pcpu_route(struct net *net, |
db3fedee | 1399 | const struct fib6_result *res) |
a73e4195 MKL |
1400 | { |
1401 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 | 1402 | |
db3fedee | 1403 | pcpu_rt = ip6_rt_pcpu_alloc(res); |
0e09edcc WW |
1404 | if (!pcpu_rt) |
1405 | return NULL; | |
d52d3997 | 1406 | |
f40b6ae2 | 1407 | p = this_cpu_ptr(res->nh->rt6i_pcpu); |
a94b9367 | 1408 | prev = cmpxchg(p, NULL, pcpu_rt); |
951f788a | 1409 | BUG_ON(prev); |
a94b9367 | 1410 | |
61fb0d01 ED |
1411 | if (res->f6i->fib6_destroying) { |
1412 | struct fib6_info *from; | |
1413 | ||
1414 | from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); | |
1415 | fib6_info_release(from); | |
1416 | } | |
1417 | ||
d52d3997 MKL |
1418 | return pcpu_rt; |
1419 | } | |
1420 | ||
35732d01 WW |
1421 | /* exception hash table implementation |
1422 | */ | |
1423 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1424 | ||
1425 | /* Remove rt6_ex from hash table and free the memory | |
1426 | * Caller must hold rt6_exception_lock | |
1427 | */ | |
1428 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1429 | struct rt6_exception *rt6_ex) | |
1430 | { | |
f5b51fe8 | 1431 | struct fib6_info *from; |
b2427e67 | 1432 | struct net *net; |
81eb8447 | 1433 | |
35732d01 WW |
1434 | if (!bucket || !rt6_ex) |
1435 | return; | |
b2427e67 CIK |
1436 | |
1437 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
f5b51fe8 PA |
1438 | net->ipv6.rt6_stats->fib_rt_cache--; |
1439 | ||
1440 | /* purge completely the exception to allow releasing the held resources: | |
1441 | * some [sk] cache may keep the dst around for unlimited time | |
1442 | */ | |
0e233874 | 1443 | from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL); |
f5b51fe8 PA |
1444 | fib6_info_release(from); |
1445 | dst_dev_put(&rt6_ex->rt6i->dst); | |
1446 | ||
35732d01 | 1447 | hlist_del_rcu(&rt6_ex->hlist); |
77634cc6 | 1448 | dst_release(&rt6_ex->rt6i->dst); |
35732d01 WW |
1449 | kfree_rcu(rt6_ex, rcu); |
1450 | WARN_ON_ONCE(!bucket->depth); | |
1451 | bucket->depth--; | |
1452 | } | |
1453 | ||
1454 | /* Remove oldest rt6_ex in bucket and free the memory | |
1455 | * Caller must hold rt6_exception_lock | |
1456 | */ | |
1457 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1458 | { | |
1459 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1460 | ||
1461 | if (!bucket) | |
1462 | return; | |
1463 | ||
1464 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1465 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1466 | oldest = rt6_ex; | |
1467 | } | |
1468 | rt6_remove_exception(bucket, oldest); | |
1469 | } | |
1470 | ||
1471 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1472 | const struct in6_addr *src) | |
1473 | { | |
1474 | static u32 seed __read_mostly; | |
1475 | u32 val; | |
1476 | ||
1477 | net_get_random_once(&seed, sizeof(seed)); | |
1478 | val = jhash(dst, sizeof(*dst), seed); | |
1479 | ||
1480 | #ifdef CONFIG_IPV6_SUBTREES | |
1481 | if (src) | |
1482 | val = jhash(src, sizeof(*src), val); | |
1483 | #endif | |
1484 | return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
1485 | } | |
1486 | ||
1487 | /* Helper function to find the cached rt in the hash table | |
1488 | * and update bucket pointer to point to the bucket for this | |
1489 | * (daddr, saddr) pair | |
1490 | * Caller must hold rt6_exception_lock | |
1491 | */ | |
1492 | static struct rt6_exception * | |
1493 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1494 | const struct in6_addr *daddr, | |
1495 | const struct in6_addr *saddr) | |
1496 | { | |
1497 | struct rt6_exception *rt6_ex; | |
1498 | u32 hval; | |
1499 | ||
1500 | if (!(*bucket) || !daddr) | |
1501 | return NULL; | |
1502 | ||
1503 | hval = rt6_exception_hash(daddr, saddr); | |
1504 | *bucket += hval; | |
1505 | ||
1506 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1507 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1508 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1509 | ||
1510 | #ifdef CONFIG_IPV6_SUBTREES | |
1511 | if (matched && saddr) | |
1512 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1513 | #endif | |
1514 | if (matched) | |
1515 | return rt6_ex; | |
1516 | } | |
1517 | return NULL; | |
1518 | } | |
1519 | ||
1520 | /* Helper function to find the cached rt in the hash table | |
1521 | * and update bucket pointer to point to the bucket for this | |
1522 | * (daddr, saddr) pair | |
1523 | * Caller must hold rcu_read_lock() | |
1524 | */ | |
1525 | static struct rt6_exception * | |
1526 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1527 | const struct in6_addr *daddr, | |
1528 | const struct in6_addr *saddr) | |
1529 | { | |
1530 | struct rt6_exception *rt6_ex; | |
1531 | u32 hval; | |
1532 | ||
1533 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1534 | ||
1535 | if (!(*bucket) || !daddr) | |
1536 | return NULL; | |
1537 | ||
1538 | hval = rt6_exception_hash(daddr, saddr); | |
1539 | *bucket += hval; | |
1540 | ||
1541 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1542 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1543 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1544 | ||
1545 | #ifdef CONFIG_IPV6_SUBTREES | |
1546 | if (matched && saddr) | |
1547 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1548 | #endif | |
1549 | if (matched) | |
1550 | return rt6_ex; | |
1551 | } | |
1552 | return NULL; | |
1553 | } | |
1554 | ||
b748f260 | 1555 | static unsigned int fib6_mtu(const struct fib6_result *res) |
d4ead6b3 | 1556 | { |
b748f260 | 1557 | const struct fib6_nh *nh = res->nh; |
d4ead6b3 DA |
1558 | unsigned int mtu; |
1559 | ||
b748f260 DA |
1560 | if (res->f6i->fib6_pmtu) { |
1561 | mtu = res->f6i->fib6_pmtu; | |
dcd1f572 | 1562 | } else { |
b748f260 | 1563 | struct net_device *dev = nh->fib_nh_dev; |
dcd1f572 DA |
1564 | struct inet6_dev *idev; |
1565 | ||
1566 | rcu_read_lock(); | |
1567 | idev = __in6_dev_get(dev); | |
1568 | mtu = idev->cnf.mtu6; | |
1569 | rcu_read_unlock(); | |
1570 | } | |
1571 | ||
d4ead6b3 DA |
1572 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1573 | ||
b748f260 | 1574 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
d4ead6b3 DA |
1575 | } |
1576 | ||
cc5c073a DA |
1577 | #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL |
1578 | ||
1579 | /* used when the flushed bit is not relevant, only access to the bucket | |
1580 | * (ie., all bucket users except rt6_insert_exception); | |
1581 | * | |
1582 | * called under rcu lock; sometimes called with rt6_exception_lock held | |
1583 | */ | |
1584 | static | |
1585 | struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh, | |
1586 | spinlock_t *lock) | |
1587 | { | |
1588 | struct rt6_exception_bucket *bucket; | |
1589 | ||
1590 | if (lock) | |
1591 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1592 | lockdep_is_held(lock)); | |
1593 | else | |
1594 | bucket = rcu_dereference(nh->rt6i_exception_bucket); | |
1595 | ||
1596 | /* remove bucket flushed bit if set */ | |
1597 | if (bucket) { | |
1598 | unsigned long p = (unsigned long)bucket; | |
1599 | ||
1600 | p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1601 | bucket = (struct rt6_exception_bucket *)p; | |
1602 | } | |
1603 | ||
1604 | return bucket; | |
1605 | } | |
1606 | ||
1607 | static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket) | |
1608 | { | |
1609 | unsigned long p = (unsigned long)bucket; | |
1610 | ||
1611 | return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED); | |
1612 | } | |
1613 | ||
1614 | /* called with rt6_exception_lock held */ | |
1615 | static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh, | |
1616 | spinlock_t *lock) | |
1617 | { | |
1618 | struct rt6_exception_bucket *bucket; | |
1619 | unsigned long p; | |
1620 | ||
1621 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1622 | lockdep_is_held(lock)); | |
1623 | ||
1624 | p = (unsigned long)bucket; | |
1625 | p |= FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1626 | bucket = (struct rt6_exception_bucket *)p; | |
1627 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); | |
1628 | } | |
1629 | ||
35732d01 | 1630 | static int rt6_insert_exception(struct rt6_info *nrt, |
5012f0a5 | 1631 | const struct fib6_result *res) |
35732d01 | 1632 | { |
5e670d84 | 1633 | struct net *net = dev_net(nrt->dst.dev); |
35732d01 | 1634 | struct rt6_exception_bucket *bucket; |
cc5c073a | 1635 | struct fib6_info *f6i = res->f6i; |
35732d01 WW |
1636 | struct in6_addr *src_key = NULL; |
1637 | struct rt6_exception *rt6_ex; | |
cc5c073a | 1638 | struct fib6_nh *nh = res->nh; |
35732d01 WW |
1639 | int err = 0; |
1640 | ||
35732d01 WW |
1641 | spin_lock_bh(&rt6_exception_lock); |
1642 | ||
cc5c073a DA |
1643 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, |
1644 | lockdep_is_held(&rt6_exception_lock)); | |
35732d01 WW |
1645 | if (!bucket) { |
1646 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1647 | GFP_ATOMIC); | |
1648 | if (!bucket) { | |
1649 | err = -ENOMEM; | |
1650 | goto out; | |
1651 | } | |
cc5c073a DA |
1652 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); |
1653 | } else if (fib6_nh_excptn_bucket_flushed(bucket)) { | |
1654 | err = -EINVAL; | |
1655 | goto out; | |
35732d01 WW |
1656 | } |
1657 | ||
1658 | #ifdef CONFIG_IPV6_SUBTREES | |
5012f0a5 | 1659 | /* fib6_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1660 | * and exception table is indexed by a hash of |
5012f0a5 | 1661 | * both fib6_dst and fib6_src. |
35732d01 | 1662 | * Otherwise, the exception table is indexed by |
5012f0a5 | 1663 | * a hash of only fib6_dst. |
35732d01 | 1664 | */ |
5012f0a5 | 1665 | if (f6i->fib6_src.plen) |
35732d01 WW |
1666 | src_key = &nrt->rt6i_src.addr; |
1667 | #endif | |
5012f0a5 | 1668 | /* rt6_mtu_change() might lower mtu on f6i. |
f5bbe7ee | 1669 | * Only insert this exception route if its mtu |
5012f0a5 | 1670 | * is less than f6i's mtu value. |
f5bbe7ee | 1671 | */ |
b748f260 | 1672 | if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) { |
f5bbe7ee WW |
1673 | err = -EINVAL; |
1674 | goto out; | |
1675 | } | |
60006a48 | 1676 | |
35732d01 WW |
1677 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1678 | src_key); | |
1679 | if (rt6_ex) | |
1680 | rt6_remove_exception(bucket, rt6_ex); | |
1681 | ||
1682 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1683 | if (!rt6_ex) { | |
1684 | err = -ENOMEM; | |
1685 | goto out; | |
1686 | } | |
1687 | rt6_ex->rt6i = nrt; | |
1688 | rt6_ex->stamp = jiffies; | |
35732d01 WW |
1689 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); |
1690 | bucket->depth++; | |
81eb8447 | 1691 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 WW |
1692 | |
1693 | if (bucket->depth > FIB6_MAX_DEPTH) | |
1694 | rt6_exception_remove_oldest(bucket); | |
1695 | ||
1696 | out: | |
1697 | spin_unlock_bh(&rt6_exception_lock); | |
1698 | ||
1699 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1700 | if (!err) { |
5012f0a5 DA |
1701 | spin_lock_bh(&f6i->fib6_table->tb6_lock); |
1702 | fib6_update_sernum(net, f6i); | |
1703 | spin_unlock_bh(&f6i->fib6_table->tb6_lock); | |
b886d5f2 PA |
1704 | fib6_force_start_gc(net); |
1705 | } | |
35732d01 WW |
1706 | |
1707 | return err; | |
1708 | } | |
1709 | ||
c0b220cf | 1710 | static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from) |
35732d01 WW |
1711 | { |
1712 | struct rt6_exception_bucket *bucket; | |
1713 | struct rt6_exception *rt6_ex; | |
1714 | struct hlist_node *tmp; | |
1715 | int i; | |
1716 | ||
1717 | spin_lock_bh(&rt6_exception_lock); | |
35732d01 | 1718 | |
cc5c073a | 1719 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
35732d01 WW |
1720 | if (!bucket) |
1721 | goto out; | |
1722 | ||
cc5c073a DA |
1723 | /* Prevent rt6_insert_exception() to recreate the bucket list */ |
1724 | if (!from) | |
1725 | fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock); | |
1726 | ||
35732d01 | 1727 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { |
cc5c073a DA |
1728 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) { |
1729 | if (!from || | |
1730 | rcu_access_pointer(rt6_ex->rt6i->from) == from) | |
1731 | rt6_remove_exception(bucket, rt6_ex); | |
1732 | } | |
1733 | WARN_ON_ONCE(!from && bucket->depth); | |
35732d01 WW |
1734 | bucket++; |
1735 | } | |
35732d01 WW |
1736 | out: |
1737 | spin_unlock_bh(&rt6_exception_lock); | |
1738 | } | |
1739 | ||
e659ba31 DA |
1740 | static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg) |
1741 | { | |
1742 | struct fib6_info *f6i = arg; | |
1743 | ||
1744 | fib6_nh_flush_exceptions(nh, f6i); | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
c0b220cf DA |
1749 | void rt6_flush_exceptions(struct fib6_info *f6i) |
1750 | { | |
e659ba31 DA |
1751 | if (f6i->nh) |
1752 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions, | |
1753 | f6i); | |
1754 | else | |
1755 | fib6_nh_flush_exceptions(f6i->fib6_nh, f6i); | |
c0b220cf DA |
1756 | } |
1757 | ||
35732d01 WW |
1758 | /* Find cached rt in the hash table inside passed in rt |
1759 | * Caller has to hold rcu_read_lock() | |
1760 | */ | |
7e4b5128 | 1761 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
1762 | const struct in6_addr *daddr, |
1763 | const struct in6_addr *saddr) | |
35732d01 | 1764 | { |
510e2ced | 1765 | const struct in6_addr *src_key = NULL; |
35732d01 | 1766 | struct rt6_exception_bucket *bucket; |
35732d01 | 1767 | struct rt6_exception *rt6_ex; |
7e4b5128 | 1768 | struct rt6_info *ret = NULL; |
35732d01 | 1769 | |
35732d01 | 1770 | #ifdef CONFIG_IPV6_SUBTREES |
7e4b5128 | 1771 | /* fib6i_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1772 | * and exception table is indexed by a hash of |
7e4b5128 | 1773 | * both fib6_dst and fib6_src. |
510e2ced WW |
1774 | * However, the src addr used to create the hash |
1775 | * might not be exactly the passed in saddr which | |
1776 | * is a /128 addr from the flow. | |
1777 | * So we need to use f6i->fib6_src to redo lookup | |
1778 | * if the passed in saddr does not find anything. | |
1779 | * (See the logic in ip6_rt_cache_alloc() on how | |
1780 | * rt->rt6i_src is updated.) | |
35732d01 | 1781 | */ |
7e4b5128 | 1782 | if (res->f6i->fib6_src.plen) |
35732d01 | 1783 | src_key = saddr; |
510e2ced | 1784 | find_ex: |
35732d01 | 1785 | #endif |
cc5c073a | 1786 | bucket = fib6_nh_get_excptn_bucket(res->nh, NULL); |
35732d01 WW |
1787 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); |
1788 | ||
1789 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
7e4b5128 | 1790 | ret = rt6_ex->rt6i; |
35732d01 | 1791 | |
510e2ced WW |
1792 | #ifdef CONFIG_IPV6_SUBTREES |
1793 | /* Use fib6_src as src_key and redo lookup */ | |
1794 | if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) { | |
1795 | src_key = &res->f6i->fib6_src.addr; | |
1796 | goto find_ex; | |
1797 | } | |
1798 | #endif | |
1799 | ||
7e4b5128 | 1800 | return ret; |
35732d01 WW |
1801 | } |
1802 | ||
1803 | /* Remove the passed in cached rt from the hash table that contains it */ | |
cc5c073a | 1804 | static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1805 | const struct rt6_info *rt) |
35732d01 | 1806 | { |
c0b220cf | 1807 | const struct in6_addr *src_key = NULL; |
35732d01 | 1808 | struct rt6_exception_bucket *bucket; |
35732d01 WW |
1809 | struct rt6_exception *rt6_ex; |
1810 | int err; | |
1811 | ||
cc5c073a | 1812 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
35732d01 WW |
1813 | return -ENOENT; |
1814 | ||
1815 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a DA |
1816 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
1817 | ||
35732d01 | 1818 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1819 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1820 | * and exception table is indexed by a hash of | |
1821 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1822 | * Otherwise, the exception table is indexed by |
1823 | * a hash of only rt6i_dst. | |
1824 | */ | |
c0b220cf | 1825 | if (plen) |
35732d01 WW |
1826 | src_key = &rt->rt6i_src.addr; |
1827 | #endif | |
1828 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1829 | &rt->rt6i_dst.addr, | |
1830 | src_key); | |
1831 | if (rt6_ex) { | |
1832 | rt6_remove_exception(bucket, rt6_ex); | |
1833 | err = 0; | |
1834 | } else { | |
1835 | err = -ENOENT; | |
1836 | } | |
1837 | ||
1838 | spin_unlock_bh(&rt6_exception_lock); | |
1839 | return err; | |
1840 | } | |
1841 | ||
e659ba31 DA |
1842 | struct fib6_nh_excptn_arg { |
1843 | struct rt6_info *rt; | |
1844 | int plen; | |
1845 | }; | |
1846 | ||
1847 | static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg) | |
1848 | { | |
1849 | struct fib6_nh_excptn_arg *arg = _arg; | |
1850 | int err; | |
1851 | ||
1852 | err = fib6_nh_remove_exception(nh, arg->plen, arg->rt); | |
1853 | if (err == 0) | |
1854 | return 1; | |
1855 | ||
1856 | return 0; | |
1857 | } | |
1858 | ||
c0b220cf DA |
1859 | static int rt6_remove_exception_rt(struct rt6_info *rt) |
1860 | { | |
1861 | struct fib6_info *from; | |
1862 | ||
1863 | from = rcu_dereference(rt->from); | |
cc5c073a | 1864 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) |
c0b220cf DA |
1865 | return -EINVAL; |
1866 | ||
e659ba31 DA |
1867 | if (from->nh) { |
1868 | struct fib6_nh_excptn_arg arg = { | |
1869 | .rt = rt, | |
1870 | .plen = from->fib6_src.plen | |
1871 | }; | |
1872 | int rc; | |
1873 | ||
1874 | /* rc = 1 means an entry was found */ | |
1875 | rc = nexthop_for_each_fib6_nh(from->nh, | |
1876 | rt6_nh_remove_exception_rt, | |
1877 | &arg); | |
1878 | return rc ? 0 : -ENOENT; | |
1879 | } | |
1880 | ||
1cf844c7 | 1881 | return fib6_nh_remove_exception(from->fib6_nh, |
cc5c073a | 1882 | from->fib6_src.plen, rt); |
c0b220cf DA |
1883 | } |
1884 | ||
35732d01 WW |
1885 | /* Find rt6_ex which contains the passed in rt cache and |
1886 | * refresh its stamp | |
1887 | */ | |
cc5c073a | 1888 | static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1889 | const struct rt6_info *rt) |
35732d01 | 1890 | { |
c0b220cf | 1891 | const struct in6_addr *src_key = NULL; |
35732d01 | 1892 | struct rt6_exception_bucket *bucket; |
35732d01 | 1893 | struct rt6_exception *rt6_ex; |
193f3685 | 1894 | |
cc5c073a | 1895 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); |
35732d01 | 1896 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1897 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1898 | * and exception table is indexed by a hash of | |
1899 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1900 | * Otherwise, the exception table is indexed by |
1901 | * a hash of only rt6i_dst. | |
1902 | */ | |
c0b220cf | 1903 | if (plen) |
35732d01 WW |
1904 | src_key = &rt->rt6i_src.addr; |
1905 | #endif | |
cc5c073a | 1906 | rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key); |
35732d01 WW |
1907 | if (rt6_ex) |
1908 | rt6_ex->stamp = jiffies; | |
c0b220cf DA |
1909 | } |
1910 | ||
e659ba31 DA |
1911 | struct fib6_nh_match_arg { |
1912 | const struct net_device *dev; | |
1913 | const struct in6_addr *gw; | |
1914 | struct fib6_nh *match; | |
1915 | }; | |
1916 | ||
1917 | /* determine if fib6_nh has given device and gateway */ | |
1918 | static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
1919 | { | |
1920 | struct fib6_nh_match_arg *arg = _arg; | |
1921 | ||
1922 | if (arg->dev != nh->fib_nh_dev || | |
1923 | (arg->gw && !nh->fib_nh_gw_family) || | |
1924 | (!arg->gw && nh->fib_nh_gw_family) || | |
1925 | (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6))) | |
1926 | return 0; | |
1927 | ||
1928 | arg->match = nh; | |
1929 | ||
1930 | /* found a match, break the loop */ | |
1931 | return 1; | |
1932 | } | |
1933 | ||
c0b220cf DA |
1934 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) |
1935 | { | |
1936 | struct fib6_info *from; | |
e659ba31 | 1937 | struct fib6_nh *fib6_nh; |
35732d01 | 1938 | |
c0b220cf DA |
1939 | rcu_read_lock(); |
1940 | ||
1941 | from = rcu_dereference(rt->from); | |
1942 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) | |
1943 | goto unlock; | |
1944 | ||
e659ba31 DA |
1945 | if (from->nh) { |
1946 | struct fib6_nh_match_arg arg = { | |
1947 | .dev = rt->dst.dev, | |
1948 | .gw = &rt->rt6i_gateway, | |
1949 | }; | |
1950 | ||
1951 | nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg); | |
1952 | ||
1953 | if (!arg.match) | |
cff6a327 | 1954 | goto unlock; |
e659ba31 DA |
1955 | fib6_nh = arg.match; |
1956 | } else { | |
1957 | fib6_nh = from->fib6_nh; | |
1958 | } | |
1959 | fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt); | |
193f3685 | 1960 | unlock: |
35732d01 WW |
1961 | rcu_read_unlock(); |
1962 | } | |
1963 | ||
e9fa1495 SB |
1964 | static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev, |
1965 | struct rt6_info *rt, int mtu) | |
1966 | { | |
1967 | /* If the new MTU is lower than the route PMTU, this new MTU will be the | |
1968 | * lowest MTU in the path: always allow updating the route PMTU to | |
1969 | * reflect PMTU decreases. | |
1970 | * | |
1971 | * If the new MTU is higher, and the route PMTU is equal to the local | |
1972 | * MTU, this means the old MTU is the lowest in the path, so allow | |
1973 | * updating it: if other nodes now have lower MTUs, PMTU discovery will | |
1974 | * handle this. | |
1975 | */ | |
1976 | ||
1977 | if (dst_mtu(&rt->dst) >= mtu) | |
1978 | return true; | |
1979 | ||
1980 | if (dst_mtu(&rt->dst) == idev->cnf.mtu6) | |
1981 | return true; | |
1982 | ||
1983 | return false; | |
1984 | } | |
1985 | ||
1986 | static void rt6_exceptions_update_pmtu(struct inet6_dev *idev, | |
cc5c073a | 1987 | const struct fib6_nh *nh, int mtu) |
f5bbe7ee WW |
1988 | { |
1989 | struct rt6_exception_bucket *bucket; | |
1990 | struct rt6_exception *rt6_ex; | |
1991 | int i; | |
1992 | ||
cc5c073a | 1993 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
e9fa1495 SB |
1994 | if (!bucket) |
1995 | return; | |
1996 | ||
1997 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1998 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1999 | struct rt6_info *entry = rt6_ex->rt6i; | |
2000 | ||
2001 | /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected | |
d4ead6b3 | 2002 | * route), the metrics of its rt->from have already |
e9fa1495 SB |
2003 | * been updated. |
2004 | */ | |
d4ead6b3 | 2005 | if (dst_metric_raw(&entry->dst, RTAX_MTU) && |
e9fa1495 | 2006 | rt6_mtu_change_route_allowed(idev, entry, mtu)) |
d4ead6b3 | 2007 | dst_metric_set(&entry->dst, RTAX_MTU, mtu); |
f5bbe7ee | 2008 | } |
e9fa1495 | 2009 | bucket++; |
f5bbe7ee WW |
2010 | } |
2011 | } | |
2012 | ||
b16cb459 WW |
2013 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
2014 | ||
cc5c073a DA |
2015 | static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh, |
2016 | const struct in6_addr *gateway) | |
b16cb459 WW |
2017 | { |
2018 | struct rt6_exception_bucket *bucket; | |
2019 | struct rt6_exception *rt6_ex; | |
2020 | struct hlist_node *tmp; | |
2021 | int i; | |
2022 | ||
cc5c073a | 2023 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
b16cb459 WW |
2024 | return; |
2025 | ||
2026 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 2027 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
b16cb459 WW |
2028 | if (bucket) { |
2029 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2030 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2031 | &bucket->chain, hlist) { | |
2032 | struct rt6_info *entry = rt6_ex->rt6i; | |
2033 | ||
2034 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
2035 | RTF_CACHE_GATEWAY && | |
2036 | ipv6_addr_equal(gateway, | |
2037 | &entry->rt6i_gateway)) { | |
2038 | rt6_remove_exception(bucket, rt6_ex); | |
2039 | } | |
2040 | } | |
2041 | bucket++; | |
2042 | } | |
2043 | } | |
2044 | ||
2045 | spin_unlock_bh(&rt6_exception_lock); | |
2046 | } | |
2047 | ||
c757faa8 WW |
2048 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
2049 | struct rt6_exception *rt6_ex, | |
2050 | struct fib6_gc_args *gc_args, | |
2051 | unsigned long now) | |
2052 | { | |
2053 | struct rt6_info *rt = rt6_ex->rt6i; | |
2054 | ||
1859bac0 PA |
2055 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
2056 | * even if others have still references to them, so that on next | |
2057 | * dst_check() such references can be dropped. | |
2058 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
2059 | * expired, independently from their aging, as per RFC 8201 section 4 | |
2060 | */ | |
31afeb42 WW |
2061 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
2062 | if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { | |
2063 | RT6_TRACE("aging clone %p\n", rt); | |
2064 | rt6_remove_exception(bucket, rt6_ex); | |
2065 | return; | |
2066 | } | |
2067 | } else if (time_after(jiffies, rt->dst.expires)) { | |
2068 | RT6_TRACE("purging expired route %p\n", rt); | |
c757faa8 WW |
2069 | rt6_remove_exception(bucket, rt6_ex); |
2070 | return; | |
31afeb42 WW |
2071 | } |
2072 | ||
2073 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
c757faa8 WW |
2074 | struct neighbour *neigh; |
2075 | __u8 neigh_flags = 0; | |
2076 | ||
1bfa26ff ED |
2077 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
2078 | if (neigh) | |
c757faa8 | 2079 | neigh_flags = neigh->flags; |
1bfa26ff | 2080 | |
c757faa8 WW |
2081 | if (!(neigh_flags & NTF_ROUTER)) { |
2082 | RT6_TRACE("purging route %p via non-router but gateway\n", | |
2083 | rt); | |
2084 | rt6_remove_exception(bucket, rt6_ex); | |
2085 | return; | |
2086 | } | |
2087 | } | |
31afeb42 | 2088 | |
c757faa8 WW |
2089 | gc_args->more++; |
2090 | } | |
2091 | ||
cc5c073a | 2092 | static void fib6_nh_age_exceptions(const struct fib6_nh *nh, |
c0b220cf DA |
2093 | struct fib6_gc_args *gc_args, |
2094 | unsigned long now) | |
c757faa8 WW |
2095 | { |
2096 | struct rt6_exception_bucket *bucket; | |
2097 | struct rt6_exception *rt6_ex; | |
2098 | struct hlist_node *tmp; | |
2099 | int i; | |
2100 | ||
cc5c073a | 2101 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
c757faa8 WW |
2102 | return; |
2103 | ||
1bfa26ff ED |
2104 | rcu_read_lock_bh(); |
2105 | spin_lock(&rt6_exception_lock); | |
cc5c073a | 2106 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
c757faa8 WW |
2107 | if (bucket) { |
2108 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2109 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2110 | &bucket->chain, hlist) { | |
2111 | rt6_age_examine_exception(bucket, rt6_ex, | |
2112 | gc_args, now); | |
2113 | } | |
2114 | bucket++; | |
2115 | } | |
2116 | } | |
1bfa26ff ED |
2117 | spin_unlock(&rt6_exception_lock); |
2118 | rcu_read_unlock_bh(); | |
c757faa8 WW |
2119 | } |
2120 | ||
e659ba31 DA |
2121 | struct fib6_nh_age_excptn_arg { |
2122 | struct fib6_gc_args *gc_args; | |
2123 | unsigned long now; | |
2124 | }; | |
2125 | ||
2126 | static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg) | |
2127 | { | |
2128 | struct fib6_nh_age_excptn_arg *arg = _arg; | |
2129 | ||
2130 | fib6_nh_age_exceptions(nh, arg->gc_args, arg->now); | |
2131 | return 0; | |
2132 | } | |
2133 | ||
cc5c073a | 2134 | void rt6_age_exceptions(struct fib6_info *f6i, |
c0b220cf DA |
2135 | struct fib6_gc_args *gc_args, |
2136 | unsigned long now) | |
2137 | { | |
e659ba31 DA |
2138 | if (f6i->nh) { |
2139 | struct fib6_nh_age_excptn_arg arg = { | |
2140 | .gc_args = gc_args, | |
2141 | .now = now | |
2142 | }; | |
2143 | ||
2144 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions, | |
2145 | &arg); | |
2146 | } else { | |
2147 | fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now); | |
2148 | } | |
c0b220cf DA |
2149 | } |
2150 | ||
1d053da9 | 2151 | /* must be called with rcu lock held */ |
effda4dd DA |
2152 | int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif, |
2153 | struct flowi6 *fl6, struct fib6_result *res, int strict) | |
1da177e4 | 2154 | { |
367efcb9 | 2155 | struct fib6_node *fn, *saved_fn; |
1da177e4 | 2156 | |
6454743b | 2157 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 2158 | saved_fn = fn; |
1da177e4 | 2159 | |
ca254490 DA |
2160 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
2161 | oif = 0; | |
2162 | ||
a3c00e46 | 2163 | redo_rt6_select: |
effda4dd DA |
2164 | rt6_select(net, fn, oif, res, strict); |
2165 | if (res->f6i == net->ipv6.fib6_null_entry) { | |
a3c00e46 MKL |
2166 | fn = fib6_backtrack(fn, &fl6->saddr); |
2167 | if (fn) | |
2168 | goto redo_rt6_select; | |
367efcb9 MKL |
2169 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
2170 | /* also consider unreachable route */ | |
2171 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
2172 | fn = saved_fn; | |
2173 | goto redo_rt6_select; | |
367efcb9 | 2174 | } |
a3c00e46 MKL |
2175 | } |
2176 | ||
effda4dd | 2177 | trace_fib6_table_lookup(net, res, table, fl6); |
fb9de91e | 2178 | |
effda4dd | 2179 | return 0; |
1d053da9 DA |
2180 | } |
2181 | ||
2182 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, | |
2183 | int oif, struct flowi6 *fl6, | |
2184 | const struct sk_buff *skb, int flags) | |
2185 | { | |
b1d40991 | 2186 | struct fib6_result res = {}; |
0e09edcc | 2187 | struct rt6_info *rt = NULL; |
1d053da9 DA |
2188 | int strict = 0; |
2189 | ||
0e09edcc WW |
2190 | WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) && |
2191 | !rcu_read_lock_held()); | |
2192 | ||
1d053da9 DA |
2193 | strict |= flags & RT6_LOOKUP_F_IFACE; |
2194 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; | |
2195 | if (net->ipv6.devconf_all->forwarding == 0) | |
2196 | strict |= RT6_LOOKUP_F_REACHABLE; | |
2197 | ||
2198 | rcu_read_lock(); | |
2199 | ||
effda4dd | 2200 | fib6_table_lookup(net, table, oif, fl6, &res, strict); |
0e09edcc WW |
2201 | if (res.f6i == net->ipv6.fib6_null_entry) |
2202 | goto out; | |
23fb93a4 | 2203 | |
b1d40991 | 2204 | fib6_select_path(net, &res, fl6, oif, false, skb, strict); |
d83009d4 | 2205 | |
23fb93a4 | 2206 | /*Search through exception table */ |
7e4b5128 | 2207 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 2208 | if (rt) { |
0e09edcc | 2209 | goto out; |
3da59bd9 | 2210 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
b1d40991 | 2211 | !res.nh->fib_nh_gw_family)) { |
3da59bd9 MKL |
2212 | /* Create a RTF_CACHE clone which will not be |
2213 | * owned by the fib6 tree. It is for the special case where | |
2214 | * the daddr in the skb during the neighbor look-up is different | |
2215 | * from the fl6->daddr used to look-up route here. | |
2216 | */ | |
0e09edcc | 2217 | rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); |
c71099ac | 2218 | |
0e09edcc WW |
2219 | if (rt) { |
2220 | /* 1 refcnt is taken during ip6_rt_cache_alloc(). | |
2221 | * As rt6_uncached_list_add() does not consume refcnt, | |
2222 | * this refcnt is always returned to the caller even | |
2223 | * if caller sets RT6_LOOKUP_F_DST_NOREF flag. | |
1cfb71ee | 2224 | */ |
0e09edcc | 2225 | rt6_uncached_list_add(rt); |
81eb8447 | 2226 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
0e09edcc | 2227 | rcu_read_unlock(); |
b811580d | 2228 | |
0e09edcc WW |
2229 | return rt; |
2230 | } | |
d52d3997 MKL |
2231 | } else { |
2232 | /* Get a percpu copy */ | |
951f788a | 2233 | local_bh_disable(); |
0e09edcc | 2234 | rt = rt6_get_pcpu_route(&res); |
d52d3997 | 2235 | |
0e09edcc WW |
2236 | if (!rt) |
2237 | rt = rt6_make_pcpu_route(net, &res); | |
93531c67 | 2238 | |
951f788a | 2239 | local_bh_enable(); |
d52d3997 | 2240 | } |
0e09edcc WW |
2241 | out: |
2242 | if (!rt) | |
2243 | rt = net->ipv6.ip6_null_entry; | |
2244 | if (!(flags & RT6_LOOKUP_F_DST_NOREF)) | |
2245 | ip6_hold_safe(net, &rt); | |
2246 | rcu_read_unlock(); | |
2247 | ||
2248 | return rt; | |
1da177e4 | 2249 | } |
9ff74384 | 2250 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 2251 | |
b75cc8f9 DA |
2252 | static struct rt6_info *ip6_pol_route_input(struct net *net, |
2253 | struct fib6_table *table, | |
2254 | struct flowi6 *fl6, | |
2255 | const struct sk_buff *skb, | |
2256 | int flags) | |
4acad72d | 2257 | { |
b75cc8f9 | 2258 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags); |
4acad72d PE |
2259 | } |
2260 | ||
d409b847 MB |
2261 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
2262 | struct net_device *dev, | |
b75cc8f9 DA |
2263 | struct flowi6 *fl6, |
2264 | const struct sk_buff *skb, | |
2265 | int flags) | |
72331bc0 SL |
2266 | { |
2267 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
2268 | flags |= RT6_LOOKUP_F_IFACE; | |
2269 | ||
b75cc8f9 | 2270 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input); |
72331bc0 | 2271 | } |
d409b847 | 2272 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 2273 | |
23aebdac | 2274 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
5e5d6fed RP |
2275 | struct flow_keys *keys, |
2276 | struct flow_keys *flkeys) | |
23aebdac JS |
2277 | { |
2278 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
2279 | const struct ipv6hdr *key_iph = outer_iph; | |
5e5d6fed | 2280 | struct flow_keys *_flkeys = flkeys; |
23aebdac JS |
2281 | const struct ipv6hdr *inner_iph; |
2282 | const struct icmp6hdr *icmph; | |
2283 | struct ipv6hdr _inner_iph; | |
cea67a2d | 2284 | struct icmp6hdr _icmph; |
23aebdac JS |
2285 | |
2286 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
2287 | goto out; | |
2288 | ||
cea67a2d ED |
2289 | icmph = skb_header_pointer(skb, skb_transport_offset(skb), |
2290 | sizeof(_icmph), &_icmph); | |
2291 | if (!icmph) | |
2292 | goto out; | |
2293 | ||
23aebdac JS |
2294 | if (icmph->icmp6_type != ICMPV6_DEST_UNREACH && |
2295 | icmph->icmp6_type != ICMPV6_PKT_TOOBIG && | |
2296 | icmph->icmp6_type != ICMPV6_TIME_EXCEED && | |
2297 | icmph->icmp6_type != ICMPV6_PARAMPROB) | |
2298 | goto out; | |
2299 | ||
2300 | inner_iph = skb_header_pointer(skb, | |
2301 | skb_transport_offset(skb) + sizeof(*icmph), | |
2302 | sizeof(_inner_iph), &_inner_iph); | |
2303 | if (!inner_iph) | |
2304 | goto out; | |
2305 | ||
2306 | key_iph = inner_iph; | |
5e5d6fed | 2307 | _flkeys = NULL; |
23aebdac | 2308 | out: |
5e5d6fed RP |
2309 | if (_flkeys) { |
2310 | keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src; | |
2311 | keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst; | |
2312 | keys->tags.flow_label = _flkeys->tags.flow_label; | |
2313 | keys->basic.ip_proto = _flkeys->basic.ip_proto; | |
2314 | } else { | |
2315 | keys->addrs.v6addrs.src = key_iph->saddr; | |
2316 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
fa1be7e0 | 2317 | keys->tags.flow_label = ip6_flowlabel(key_iph); |
5e5d6fed RP |
2318 | keys->basic.ip_proto = key_iph->nexthdr; |
2319 | } | |
23aebdac JS |
2320 | } |
2321 | ||
2322 | /* if skb is set it will be used and fl6 can be NULL */ | |
b4bac172 DA |
2323 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
2324 | const struct sk_buff *skb, struct flow_keys *flkeys) | |
23aebdac JS |
2325 | { |
2326 | struct flow_keys hash_keys; | |
9a2a537a | 2327 | u32 mhash; |
23aebdac | 2328 | |
bbfa047a | 2329 | switch (ip6_multipath_hash_policy(net)) { |
b4bac172 DA |
2330 | case 0: |
2331 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2332 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2333 | if (skb) { | |
2334 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2335 | } else { | |
2336 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2337 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
fa1be7e0 | 2338 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
b4bac172 DA |
2339 | hash_keys.basic.ip_proto = fl6->flowi6_proto; |
2340 | } | |
2341 | break; | |
2342 | case 1: | |
2343 | if (skb) { | |
2344 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2345 | struct flow_keys keys; | |
2346 | ||
2347 | /* short-circuit if we already have L4 hash present */ | |
2348 | if (skb->l4_hash) | |
2349 | return skb_get_hash_raw(skb) >> 1; | |
2350 | ||
2351 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2352 | ||
2353 | if (!flkeys) { | |
2354 | skb_flow_dissect_flow_keys(skb, &keys, flag); | |
2355 | flkeys = &keys; | |
2356 | } | |
2357 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2358 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2359 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2360 | hash_keys.ports.src = flkeys->ports.src; | |
2361 | hash_keys.ports.dst = flkeys->ports.dst; | |
2362 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2363 | } else { | |
2364 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2365 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2366 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2367 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2368 | hash_keys.ports.src = fl6->fl6_sport; | |
2369 | hash_keys.ports.dst = fl6->fl6_dport; | |
2370 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2371 | } | |
2372 | break; | |
d8f74f09 SS |
2373 | case 2: |
2374 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2375 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2376 | if (skb) { | |
2377 | struct flow_keys keys; | |
2378 | ||
2379 | if (!flkeys) { | |
2380 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2381 | flkeys = &keys; | |
2382 | } | |
2383 | ||
2384 | /* Inner can be v4 or v6 */ | |
2385 | if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2386 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2387 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
2388 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
2389 | } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2390 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2391 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2392 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2393 | hash_keys.tags.flow_label = flkeys->tags.flow_label; | |
2394 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2395 | } else { | |
2396 | /* Same as case 0 */ | |
2397 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2398 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2399 | } | |
2400 | } else { | |
2401 | /* Same as case 0 */ | |
2402 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2403 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2404 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2405 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2406 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2407 | } | |
2408 | break; | |
23aebdac | 2409 | } |
9a2a537a | 2410 | mhash = flow_hash_from_keys(&hash_keys); |
23aebdac | 2411 | |
9a2a537a | 2412 | return mhash >> 1; |
23aebdac JS |
2413 | } |
2414 | ||
67f415dd | 2415 | /* Called with rcu held */ |
c71099ac TG |
2416 | void ip6_route_input(struct sk_buff *skb) |
2417 | { | |
b71d1d42 | 2418 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 2419 | struct net *net = dev_net(skb->dev); |
67f415dd | 2420 | int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF; |
904af04d | 2421 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 2422 | struct flowi6 fl6 = { |
e0d56fdd | 2423 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
2424 | .daddr = iph->daddr, |
2425 | .saddr = iph->saddr, | |
6502ca52 | 2426 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
2427 | .flowi6_mark = skb->mark, |
2428 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 2429 | }; |
5e5d6fed | 2430 | struct flow_keys *flkeys = NULL, _flkeys; |
adaa70bb | 2431 | |
904af04d | 2432 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2433 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 2434 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
5e5d6fed RP |
2435 | |
2436 | if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys)) | |
2437 | flkeys = &_flkeys; | |
2438 | ||
23aebdac | 2439 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
b4bac172 | 2440 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys); |
06e9d040 | 2441 | skb_dst_drop(skb); |
67f415dd WW |
2442 | skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev, |
2443 | &fl6, skb, flags)); | |
c71099ac TG |
2444 | } |
2445 | ||
b75cc8f9 DA |
2446 | static struct rt6_info *ip6_pol_route_output(struct net *net, |
2447 | struct fib6_table *table, | |
2448 | struct flowi6 *fl6, | |
2449 | const struct sk_buff *skb, | |
2450 | int flags) | |
1da177e4 | 2451 | { |
b75cc8f9 | 2452 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags); |
c71099ac TG |
2453 | } |
2454 | ||
7d9e5f42 WW |
2455 | struct dst_entry *ip6_route_output_flags_noref(struct net *net, |
2456 | const struct sock *sk, | |
2457 | struct flowi6 *fl6, int flags) | |
c71099ac | 2458 | { |
d46a9d67 | 2459 | bool any_src; |
c71099ac | 2460 | |
3ede0bbc RS |
2461 | if (ipv6_addr_type(&fl6->daddr) & |
2462 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) { | |
4c1feac5 DA |
2463 | struct dst_entry *dst; |
2464 | ||
7d9e5f42 | 2465 | /* This function does not take refcnt on the dst */ |
4c1feac5 DA |
2466 | dst = l3mdev_link_scope_lookup(net, fl6); |
2467 | if (dst) | |
2468 | return dst; | |
2469 | } | |
ca254490 | 2470 | |
1fb9489b | 2471 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 2472 | |
7d9e5f42 | 2473 | flags |= RT6_LOOKUP_F_DST_NOREF; |
d46a9d67 | 2474 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 2475 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 2476 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 2477 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 2478 | |
d46a9d67 | 2479 | if (!any_src) |
adaa70bb | 2480 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
2481 | else if (sk) |
2482 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 2483 | |
b75cc8f9 | 2484 | return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output); |
1da177e4 | 2485 | } |
7d9e5f42 WW |
2486 | EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref); |
2487 | ||
2488 | struct dst_entry *ip6_route_output_flags(struct net *net, | |
2489 | const struct sock *sk, | |
2490 | struct flowi6 *fl6, | |
2491 | int flags) | |
2492 | { | |
2493 | struct dst_entry *dst; | |
2494 | struct rt6_info *rt6; | |
2495 | ||
2496 | rcu_read_lock(); | |
2497 | dst = ip6_route_output_flags_noref(net, sk, fl6, flags); | |
2498 | rt6 = (struct rt6_info *)dst; | |
2499 | /* For dst cached in uncached_list, refcnt is already taken. */ | |
2500 | if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) { | |
2501 | dst = &net->ipv6.ip6_null_entry->dst; | |
2502 | dst_hold(dst); | |
2503 | } | |
2504 | rcu_read_unlock(); | |
2505 | ||
2506 | return dst; | |
2507 | } | |
6f21c96a | 2508 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 2509 | |
2774c131 | 2510 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2511 | { |
5c1e6aa3 | 2512 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 2513 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
2514 | struct dst_entry *new = NULL; |
2515 | ||
1dbe3252 | 2516 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 2517 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2518 | if (rt) { |
0a1f5962 | 2519 | rt6_info_init(rt); |
81eb8447 | 2520 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 2521 | |
0a1f5962 | 2522 | new = &rt->dst; |
14e50e57 | 2523 | new->__use = 1; |
352e512c | 2524 | new->input = dst_discard; |
ede2059d | 2525 | new->output = dst_discard_out; |
14e50e57 | 2526 | |
0a1f5962 | 2527 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2528 | |
1dbe3252 | 2529 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 2530 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 2531 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
2532 | |
2533 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
2534 | #ifdef CONFIG_IPV6_SUBTREES | |
2535 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
2536 | #endif | |
14e50e57 DM |
2537 | } |
2538 | ||
69ead7af DM |
2539 | dst_release(dst_orig); |
2540 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 2541 | } |
14e50e57 | 2542 | |
1da177e4 LT |
2543 | /* |
2544 | * Destination cache support functions | |
2545 | */ | |
2546 | ||
8d1c802b | 2547 | static bool fib6_check(struct fib6_info *f6i, u32 cookie) |
4b32b5ad | 2548 | { |
93531c67 DA |
2549 | u32 rt_cookie = 0; |
2550 | ||
8ae86971 | 2551 | if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie) |
93531c67 DA |
2552 | return false; |
2553 | ||
2554 | if (fib6_check_expired(f6i)) | |
2555 | return false; | |
2556 | ||
2557 | return true; | |
4b32b5ad MKL |
2558 | } |
2559 | ||
a68886a6 DA |
2560 | static struct dst_entry *rt6_check(struct rt6_info *rt, |
2561 | struct fib6_info *from, | |
2562 | u32 cookie) | |
3da59bd9 | 2563 | { |
36143645 | 2564 | u32 rt_cookie = 0; |
c5cff856 | 2565 | |
49d05fe2 | 2566 | if (!from || !fib6_get_cookie_safe(from, &rt_cookie) || |
93531c67 | 2567 | rt_cookie != cookie) |
3da59bd9 MKL |
2568 | return NULL; |
2569 | ||
2570 | if (rt6_check_expired(rt)) | |
2571 | return NULL; | |
2572 | ||
2573 | return &rt->dst; | |
2574 | } | |
2575 | ||
a68886a6 DA |
2576 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, |
2577 | struct fib6_info *from, | |
2578 | u32 cookie) | |
3da59bd9 | 2579 | { |
5973fb1e MKL |
2580 | if (!__rt6_check_expired(rt) && |
2581 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
a68886a6 | 2582 | fib6_check(from, cookie)) |
3da59bd9 MKL |
2583 | return &rt->dst; |
2584 | else | |
2585 | return NULL; | |
2586 | } | |
2587 | ||
1da177e4 LT |
2588 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
2589 | { | |
a87b7dc9 | 2590 | struct dst_entry *dst_ret; |
a68886a6 | 2591 | struct fib6_info *from; |
1da177e4 LT |
2592 | struct rt6_info *rt; |
2593 | ||
a87b7dc9 DA |
2594 | rt = container_of(dst, struct rt6_info, dst); |
2595 | ||
2596 | rcu_read_lock(); | |
1da177e4 | 2597 | |
6f3118b5 ND |
2598 | /* All IPV6 dsts are created with ->obsolete set to the value |
2599 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
2600 | * into this function always. | |
2601 | */ | |
e3bc10bd | 2602 | |
a68886a6 | 2603 | from = rcu_dereference(rt->from); |
4b32b5ad | 2604 | |
a68886a6 DA |
2605 | if (from && (rt->rt6i_flags & RTF_PCPU || |
2606 | unlikely(!list_empty(&rt->rt6i_uncached)))) | |
2607 | dst_ret = rt6_dst_from_check(rt, from, cookie); | |
3da59bd9 | 2608 | else |
a68886a6 | 2609 | dst_ret = rt6_check(rt, from, cookie); |
a87b7dc9 DA |
2610 | |
2611 | rcu_read_unlock(); | |
2612 | ||
2613 | return dst_ret; | |
1da177e4 LT |
2614 | } |
2615 | ||
2616 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
2617 | { | |
2618 | struct rt6_info *rt = (struct rt6_info *) dst; | |
2619 | ||
2620 | if (rt) { | |
54c1a859 | 2621 | if (rt->rt6i_flags & RTF_CACHE) { |
c3c14da0 | 2622 | rcu_read_lock(); |
54c1a859 | 2623 | if (rt6_check_expired(rt)) { |
93531c67 | 2624 | rt6_remove_exception_rt(rt); |
54c1a859 YH |
2625 | dst = NULL; |
2626 | } | |
c3c14da0 | 2627 | rcu_read_unlock(); |
54c1a859 | 2628 | } else { |
1da177e4 | 2629 | dst_release(dst); |
54c1a859 YH |
2630 | dst = NULL; |
2631 | } | |
1da177e4 | 2632 | } |
54c1a859 | 2633 | return dst; |
1da177e4 LT |
2634 | } |
2635 | ||
2636 | static void ip6_link_failure(struct sk_buff *skb) | |
2637 | { | |
2638 | struct rt6_info *rt; | |
2639 | ||
3ffe533c | 2640 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2641 | |
adf30907 | 2642 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2643 | if (rt) { |
8a14e46f | 2644 | rcu_read_lock(); |
1eb4f758 | 2645 | if (rt->rt6i_flags & RTF_CACHE) { |
761f6026 | 2646 | rt6_remove_exception_rt(rt); |
c5cff856 | 2647 | } else { |
a68886a6 | 2648 | struct fib6_info *from; |
c5cff856 WW |
2649 | struct fib6_node *fn; |
2650 | ||
a68886a6 DA |
2651 | from = rcu_dereference(rt->from); |
2652 | if (from) { | |
2653 | fn = rcu_dereference(from->fib6_node); | |
2654 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
2655 | fn->fn_sernum = -1; | |
2656 | } | |
1eb4f758 | 2657 | } |
8a14e46f | 2658 | rcu_read_unlock(); |
1da177e4 LT |
2659 | } |
2660 | } | |
2661 | ||
6a3e030f DA |
2662 | static void rt6_update_expires(struct rt6_info *rt0, int timeout) |
2663 | { | |
a68886a6 DA |
2664 | if (!(rt0->rt6i_flags & RTF_EXPIRES)) { |
2665 | struct fib6_info *from; | |
2666 | ||
2667 | rcu_read_lock(); | |
2668 | from = rcu_dereference(rt0->from); | |
2669 | if (from) | |
2670 | rt0->dst.expires = from->expires; | |
2671 | rcu_read_unlock(); | |
2672 | } | |
6a3e030f DA |
2673 | |
2674 | dst_set_expires(&rt0->dst, timeout); | |
2675 | rt0->rt6i_flags |= RTF_EXPIRES; | |
2676 | } | |
2677 | ||
45e4fd26 MKL |
2678 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2679 | { | |
2680 | struct net *net = dev_net(rt->dst.dev); | |
2681 | ||
d4ead6b3 | 2682 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
45e4fd26 | 2683 | rt->rt6i_flags |= RTF_MODIFIED; |
45e4fd26 MKL |
2684 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
2685 | } | |
2686 | ||
0d3f6d29 MKL |
2687 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2688 | { | |
2689 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1490ed2a | 2690 | (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from)); |
0d3f6d29 MKL |
2691 | } |
2692 | ||
45e4fd26 MKL |
2693 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
2694 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 2695 | { |
0dec879f | 2696 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2697 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2698 | |
19bda36c XL |
2699 | if (dst_metric_locked(dst, RTAX_MTU)) |
2700 | return; | |
2701 | ||
0dec879f JA |
2702 | if (iph) { |
2703 | daddr = &iph->daddr; | |
2704 | saddr = &iph->saddr; | |
2705 | } else if (sk) { | |
2706 | daddr = &sk->sk_v6_daddr; | |
2707 | saddr = &inet6_sk(sk)->saddr; | |
2708 | } else { | |
2709 | daddr = NULL; | |
2710 | saddr = NULL; | |
2711 | } | |
2712 | dst_confirm_neigh(dst, daddr); | |
45e4fd26 MKL |
2713 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
2714 | if (mtu >= dst_mtu(dst)) | |
2715 | return; | |
9d289715 | 2716 | |
0d3f6d29 | 2717 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2718 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2719 | /* update rt6_ex->stamp for cache */ |
2720 | if (rt6->rt6i_flags & RTF_CACHE) | |
2721 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2722 | } else if (daddr) { |
85bd05de | 2723 | struct fib6_result res = {}; |
45e4fd26 MKL |
2724 | struct rt6_info *nrt6; |
2725 | ||
4d85cd0c | 2726 | rcu_read_lock(); |
85bd05de DA |
2727 | res.f6i = rcu_dereference(rt6->from); |
2728 | if (!res.f6i) { | |
9c69a132 JL |
2729 | rcu_read_unlock(); |
2730 | return; | |
2731 | } | |
7d21fec9 DA |
2732 | res.fib6_flags = res.f6i->fib6_flags; |
2733 | res.fib6_type = res.f6i->fib6_type; | |
2734 | ||
2d44234b DA |
2735 | if (res.f6i->nh) { |
2736 | struct fib6_nh_match_arg arg = { | |
2737 | .dev = dst->dev, | |
2738 | .gw = &rt6->rt6i_gateway, | |
2739 | }; | |
2740 | ||
2741 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
2742 | fib6_nh_find_match, &arg); | |
2743 | ||
2744 | /* fib6_info uses a nexthop that does not have fib6_nh | |
2745 | * using the dst->dev + gw. Should be impossible. | |
2746 | */ | |
2747 | if (!arg.match) { | |
2748 | rcu_read_unlock(); | |
2749 | return; | |
2750 | } | |
2751 | ||
2752 | res.nh = arg.match; | |
2753 | } else { | |
2754 | res.nh = res.f6i->fib6_nh; | |
2755 | } | |
2756 | ||
85bd05de | 2757 | nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); |
45e4fd26 MKL |
2758 | if (nrt6) { |
2759 | rt6_do_update_pmtu(nrt6, mtu); | |
5012f0a5 | 2760 | if (rt6_insert_exception(nrt6, &res)) |
2b760fcf | 2761 | dst_release_immediate(&nrt6->dst); |
45e4fd26 | 2762 | } |
a68886a6 | 2763 | rcu_read_unlock(); |
1da177e4 LT |
2764 | } |
2765 | } | |
2766 | ||
45e4fd26 MKL |
2767 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2768 | struct sk_buff *skb, u32 mtu) | |
2769 | { | |
2770 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
2771 | } | |
2772 | ||
42ae66c8 | 2773 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2774 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2775 | { |
2776 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2777 | struct dst_entry *dst; | |
dc92095d MŻ |
2778 | struct flowi6 fl6 = { |
2779 | .flowi6_oif = oif, | |
2780 | .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark), | |
2781 | .daddr = iph->daddr, | |
2782 | .saddr = iph->saddr, | |
2783 | .flowlabel = ip6_flowinfo(iph), | |
2784 | .flowi6_uid = uid, | |
2785 | }; | |
81aded24 DM |
2786 | |
2787 | dst = ip6_route_output(net, NULL, &fl6); | |
2788 | if (!dst->error) | |
45e4fd26 | 2789 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
2790 | dst_release(dst); |
2791 | } | |
2792 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2793 | ||
2794 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2795 | { | |
7ddacfa5 | 2796 | int oif = sk->sk_bound_dev_if; |
33c162a9 MKL |
2797 | struct dst_entry *dst; |
2798 | ||
7ddacfa5 DA |
2799 | if (!oif && skb->dev) |
2800 | oif = l3mdev_master_ifindex(skb->dev); | |
2801 | ||
2802 | ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid); | |
33c162a9 MKL |
2803 | |
2804 | dst = __sk_dst_get(sk); | |
2805 | if (!dst || !dst->obsolete || | |
2806 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2807 | return; | |
2808 | ||
2809 | bh_lock_sock(sk); | |
2810 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2811 | ip6_datagram_dst_update(sk, false); | |
2812 | bh_unlock_sock(sk); | |
81aded24 DM |
2813 | } |
2814 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2815 | ||
7d6850f7 AK |
2816 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
2817 | const struct flowi6 *fl6) | |
2818 | { | |
2819 | #ifdef CONFIG_IPV6_SUBTREES | |
2820 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2821 | #endif | |
2822 | ||
2823 | ip6_dst_store(sk, dst, | |
2824 | ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? | |
2825 | &sk->sk_v6_daddr : NULL, | |
2826 | #ifdef CONFIG_IPV6_SUBTREES | |
2827 | ipv6_addr_equal(&fl6->saddr, &np->saddr) ? | |
2828 | &np->saddr : | |
2829 | #endif | |
2830 | NULL); | |
2831 | } | |
2832 | ||
9b6b35ab | 2833 | static bool ip6_redirect_nh_match(const struct fib6_result *res, |
0b34eb00 DA |
2834 | struct flowi6 *fl6, |
2835 | const struct in6_addr *gw, | |
2836 | struct rt6_info **ret) | |
2837 | { | |
9b6b35ab DA |
2838 | const struct fib6_nh *nh = res->nh; |
2839 | ||
0b34eb00 DA |
2840 | if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family || |
2841 | fl6->flowi6_oif != nh->fib_nh_dev->ifindex) | |
2842 | return false; | |
2843 | ||
2844 | /* rt_cache's gateway might be different from its 'parent' | |
2845 | * in the case of an ip redirect. | |
2846 | * So we keep searching in the exception table if the gateway | |
2847 | * is different. | |
2848 | */ | |
2849 | if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) { | |
2850 | struct rt6_info *rt_cache; | |
2851 | ||
9b6b35ab | 2852 | rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr); |
0b34eb00 DA |
2853 | if (rt_cache && |
2854 | ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) { | |
2855 | *ret = rt_cache; | |
2856 | return true; | |
2857 | } | |
2858 | return false; | |
2859 | } | |
2860 | return true; | |
2861 | } | |
2862 | ||
c55c8988 DA |
2863 | struct fib6_nh_rd_arg { |
2864 | struct fib6_result *res; | |
2865 | struct flowi6 *fl6; | |
2866 | const struct in6_addr *gw; | |
2867 | struct rt6_info **ret; | |
2868 | }; | |
2869 | ||
2870 | static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg) | |
2871 | { | |
2872 | struct fib6_nh_rd_arg *arg = _arg; | |
2873 | ||
2874 | arg->res->nh = nh; | |
2875 | return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret); | |
2876 | } | |
2877 | ||
b55b76b2 DJ |
2878 | /* Handle redirects */ |
2879 | struct ip6rd_flowi { | |
2880 | struct flowi6 fl6; | |
2881 | struct in6_addr gateway; | |
2882 | }; | |
2883 | ||
2884 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
2885 | struct fib6_table *table, | |
2886 | struct flowi6 *fl6, | |
b75cc8f9 | 2887 | const struct sk_buff *skb, |
b55b76b2 DJ |
2888 | int flags) |
2889 | { | |
2890 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
0b34eb00 | 2891 | struct rt6_info *ret = NULL; |
9b6b35ab | 2892 | struct fib6_result res = {}; |
c55c8988 DA |
2893 | struct fib6_nh_rd_arg arg = { |
2894 | .res = &res, | |
2895 | .fl6 = fl6, | |
2896 | .gw = &rdfl->gateway, | |
2897 | .ret = &ret | |
2898 | }; | |
8d1c802b | 2899 | struct fib6_info *rt; |
b55b76b2 DJ |
2900 | struct fib6_node *fn; |
2901 | ||
31680ac2 DA |
2902 | /* l3mdev_update_flow overrides oif if the device is enslaved; in |
2903 | * this case we must match on the real ingress device, so reset it | |
2904 | */ | |
2905 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) | |
2906 | fl6->flowi6_oif = skb->dev->ifindex; | |
2907 | ||
b55b76b2 | 2908 | /* Get the "current" route for this destination and |
67c408cf | 2909 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
2910 | * |
2911 | * RFC 4861 specifies that redirects should only be | |
2912 | * accepted if they come from the nexthop to the target. | |
2913 | * Due to the way the routes are chosen, this notion | |
2914 | * is a bit fuzzy and one might need to check all possible | |
2915 | * routes. | |
2916 | */ | |
2917 | ||
66f5d6ce | 2918 | rcu_read_lock(); |
6454743b | 2919 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
b55b76b2 | 2920 | restart: |
66f5d6ce | 2921 | for_each_fib6_node_rt_rcu(fn) { |
9b6b35ab | 2922 | res.f6i = rt; |
14895687 | 2923 | if (fib6_check_expired(rt)) |
b55b76b2 | 2924 | continue; |
93c2fb25 | 2925 | if (rt->fib6_flags & RTF_REJECT) |
b55b76b2 | 2926 | break; |
c55c8988 DA |
2927 | if (unlikely(rt->nh)) { |
2928 | if (nexthop_is_blackhole(rt->nh)) | |
2929 | continue; | |
2930 | /* on match, res->nh is filled in and potentially ret */ | |
2931 | if (nexthop_for_each_fib6_nh(rt->nh, | |
2932 | fib6_nh_redirect_match, | |
2933 | &arg)) | |
2934 | goto out; | |
2935 | } else { | |
2936 | res.nh = rt->fib6_nh; | |
2937 | if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, | |
2938 | &ret)) | |
2939 | goto out; | |
2940 | } | |
b55b76b2 DJ |
2941 | } |
2942 | ||
2943 | if (!rt) | |
421842ed | 2944 | rt = net->ipv6.fib6_null_entry; |
93c2fb25 | 2945 | else if (rt->fib6_flags & RTF_REJECT) { |
23fb93a4 | 2946 | ret = net->ipv6.ip6_null_entry; |
b0a1ba59 MKL |
2947 | goto out; |
2948 | } | |
2949 | ||
421842ed | 2950 | if (rt == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
2951 | fn = fib6_backtrack(fn, &fl6->saddr); |
2952 | if (fn) | |
2953 | goto restart; | |
b55b76b2 | 2954 | } |
a3c00e46 | 2955 | |
9b6b35ab | 2956 | res.f6i = rt; |
1cf844c7 | 2957 | res.nh = rt->fib6_nh; |
b0a1ba59 | 2958 | out: |
7d21fec9 | 2959 | if (ret) { |
10585b43 | 2960 | ip6_hold_safe(net, &ret); |
7d21fec9 DA |
2961 | } else { |
2962 | res.fib6_flags = res.f6i->fib6_flags; | |
2963 | res.fib6_type = res.f6i->fib6_type; | |
9b6b35ab | 2964 | ret = ip6_create_rt_rcu(&res); |
7d21fec9 | 2965 | } |
b55b76b2 | 2966 | |
66f5d6ce | 2967 | rcu_read_unlock(); |
b55b76b2 | 2968 | |
8ff2e5b2 | 2969 | trace_fib6_table_lookup(net, &res, table, fl6); |
23fb93a4 | 2970 | return ret; |
b55b76b2 DJ |
2971 | }; |
2972 | ||
2973 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
b75cc8f9 DA |
2974 | const struct flowi6 *fl6, |
2975 | const struct sk_buff *skb, | |
2976 | const struct in6_addr *gateway) | |
b55b76b2 DJ |
2977 | { |
2978 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
2979 | struct ip6rd_flowi rdfl; | |
2980 | ||
2981 | rdfl.fl6 = *fl6; | |
2982 | rdfl.gateway = *gateway; | |
2983 | ||
b75cc8f9 | 2984 | return fib6_rule_lookup(net, &rdfl.fl6, skb, |
b55b76b2 DJ |
2985 | flags, __ip6_route_redirect); |
2986 | } | |
2987 | ||
e2d118a1 LC |
2988 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
2989 | kuid_t uid) | |
3a5ad2ee DM |
2990 | { |
2991 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2992 | struct dst_entry *dst; | |
1f7f10ac MŻ |
2993 | struct flowi6 fl6 = { |
2994 | .flowi6_iif = LOOPBACK_IFINDEX, | |
2995 | .flowi6_oif = oif, | |
2996 | .flowi6_mark = mark, | |
2997 | .daddr = iph->daddr, | |
2998 | .saddr = iph->saddr, | |
2999 | .flowlabel = ip6_flowinfo(iph), | |
3000 | .flowi6_uid = uid, | |
3001 | }; | |
3a5ad2ee | 3002 | |
b75cc8f9 | 3003 | dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr); |
b55b76b2 | 3004 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
3005 | dst_release(dst); |
3006 | } | |
3007 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
3008 | ||
d456336d | 3009 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif) |
c92a59ec DJ |
3010 | { |
3011 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
3012 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
3013 | struct dst_entry *dst; | |
0b26fb17 MŻ |
3014 | struct flowi6 fl6 = { |
3015 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3016 | .flowi6_oif = oif, | |
0b26fb17 MŻ |
3017 | .daddr = msg->dest, |
3018 | .saddr = iph->daddr, | |
3019 | .flowi6_uid = sock_net_uid(net, NULL), | |
3020 | }; | |
c92a59ec | 3021 | |
b75cc8f9 | 3022 | dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr); |
b55b76b2 | 3023 | rt6_do_redirect(dst, NULL, skb); |
c92a59ec DJ |
3024 | dst_release(dst); |
3025 | } | |
3026 | ||
3a5ad2ee DM |
3027 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
3028 | { | |
e2d118a1 LC |
3029 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
3030 | sk->sk_uid); | |
3a5ad2ee DM |
3031 | } |
3032 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
3033 | ||
0dbaee3b | 3034 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 3035 | { |
0dbaee3b DM |
3036 | struct net_device *dev = dst->dev; |
3037 | unsigned int mtu = dst_mtu(dst); | |
3038 | struct net *net = dev_net(dev); | |
3039 | ||
1da177e4 LT |
3040 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
3041 | ||
5578689a DL |
3042 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
3043 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
3044 | |
3045 | /* | |
1ab1457c YH |
3046 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
3047 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
3048 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
3049 | * rely only on pmtu discovery" |
3050 | */ | |
3051 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
3052 | mtu = IPV6_MAXPLEN; | |
3053 | return mtu; | |
3054 | } | |
3055 | ||
ebb762f2 | 3056 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 3057 | { |
d33e4553 | 3058 | struct inet6_dev *idev; |
d4ead6b3 | 3059 | unsigned int mtu; |
4b32b5ad MKL |
3060 | |
3061 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 3062 | if (mtu) |
30f78d8e | 3063 | goto out; |
618f9bc7 SK |
3064 | |
3065 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
3066 | |
3067 | rcu_read_lock(); | |
3068 | idev = __in6_dev_get(dst->dev); | |
3069 | if (idev) | |
3070 | mtu = idev->cnf.mtu6; | |
3071 | rcu_read_unlock(); | |
3072 | ||
30f78d8e | 3073 | out: |
14972cbd RP |
3074 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
3075 | ||
3076 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
3077 | } |
3078 | ||
901731b8 DA |
3079 | /* MTU selection: |
3080 | * 1. mtu on route is locked - use it | |
3081 | * 2. mtu from nexthop exception | |
3082 | * 3. mtu from egress device | |
3083 | * | |
3084 | * based on ip6_dst_mtu_forward and exception logic of | |
3085 | * rt6_find_cached_rt; called with rcu_read_lock | |
3086 | */ | |
b748f260 DA |
3087 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
3088 | const struct in6_addr *daddr, | |
3089 | const struct in6_addr *saddr) | |
901731b8 | 3090 | { |
b748f260 DA |
3091 | const struct fib6_nh *nh = res->nh; |
3092 | struct fib6_info *f6i = res->f6i; | |
901731b8 | 3093 | struct inet6_dev *idev; |
510e2ced | 3094 | struct rt6_info *rt; |
901731b8 DA |
3095 | u32 mtu = 0; |
3096 | ||
3097 | if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) { | |
3098 | mtu = f6i->fib6_pmtu; | |
3099 | if (mtu) | |
3100 | goto out; | |
3101 | } | |
3102 | ||
510e2ced WW |
3103 | rt = rt6_find_cached_rt(res, daddr, saddr); |
3104 | if (unlikely(rt)) { | |
3105 | mtu = dst_metric_raw(&rt->dst, RTAX_MTU); | |
3106 | } else { | |
b748f260 | 3107 | struct net_device *dev = nh->fib_nh_dev; |
901731b8 DA |
3108 | |
3109 | mtu = IPV6_MIN_MTU; | |
3110 | idev = __in6_dev_get(dev); | |
3111 | if (idev && idev->cnf.mtu6 > mtu) | |
3112 | mtu = idev->cnf.mtu6; | |
3113 | } | |
3114 | ||
3115 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); | |
3116 | out: | |
b748f260 | 3117 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
901731b8 DA |
3118 | } |
3119 | ||
3b00944c | 3120 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 3121 | struct flowi6 *fl6) |
1da177e4 | 3122 | { |
87a11578 | 3123 | struct dst_entry *dst; |
1da177e4 LT |
3124 | struct rt6_info *rt; |
3125 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 3126 | struct net *net = dev_net(dev); |
1da177e4 | 3127 | |
38308473 | 3128 | if (unlikely(!idev)) |
122bdf67 | 3129 | return ERR_PTR(-ENODEV); |
1da177e4 | 3130 | |
ad706862 | 3131 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 3132 | if (unlikely(!rt)) { |
1da177e4 | 3133 | in6_dev_put(idev); |
87a11578 | 3134 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
3135 | goto out; |
3136 | } | |
3137 | ||
8e2ec639 | 3138 | rt->dst.flags |= DST_HOST; |
588753f1 | 3139 | rt->dst.input = ip6_input; |
8e2ec639 | 3140 | rt->dst.output = ip6_output; |
550bab42 | 3141 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 3142 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
3143 | rt->rt6i_dst.plen = 128; |
3144 | rt->rt6i_idev = idev; | |
14edd87d | 3145 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 3146 | |
4c981e28 | 3147 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
3148 | * do proper release of the net_device |
3149 | */ | |
3150 | rt6_uncached_list_add(rt); | |
81eb8447 | 3151 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1da177e4 | 3152 | |
87a11578 DM |
3153 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
3154 | ||
1da177e4 | 3155 | out: |
87a11578 | 3156 | return dst; |
1da177e4 LT |
3157 | } |
3158 | ||
569d3645 | 3159 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 3160 | { |
86393e52 | 3161 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
3162 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
3163 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
3164 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3165 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3166 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 3167 | int entries; |
7019b78e | 3168 | |
fc66f95c | 3169 | entries = dst_entries_get_fast(ops); |
49a18d86 | 3170 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 3171 | entries <= rt_max_size) |
1da177e4 LT |
3172 | goto out; |
3173 | ||
6891a346 | 3174 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 3175 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
3176 | entries = dst_entries_get_slow(ops); |
3177 | if (entries < ops->gc_thresh) | |
7019b78e | 3178 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 3179 | out: |
7019b78e | 3180 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 3181 | return entries > rt_max_size; |
1da177e4 LT |
3182 | } |
3183 | ||
b2c709cc DA |
3184 | static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg, |
3185 | const struct in6_addr *gw_addr, u32 tbid, | |
3186 | int flags, struct fib6_result *res) | |
8c14586f DA |
3187 | { |
3188 | struct flowi6 fl6 = { | |
3189 | .flowi6_oif = cfg->fc_ifindex, | |
3190 | .daddr = *gw_addr, | |
3191 | .saddr = cfg->fc_prefsrc, | |
3192 | }; | |
3193 | struct fib6_table *table; | |
b2c709cc | 3194 | int err; |
8c14586f | 3195 | |
f4797b33 | 3196 | table = fib6_get_table(net, tbid); |
8c14586f | 3197 | if (!table) |
b2c709cc | 3198 | return -EINVAL; |
8c14586f DA |
3199 | |
3200 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
3201 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3202 | ||
f4797b33 | 3203 | flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f | 3204 | |
b2c709cc DA |
3205 | err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags); |
3206 | if (!err && res->f6i != net->ipv6.fib6_null_entry) | |
3207 | fib6_select_path(net, res, &fl6, cfg->fc_ifindex, | |
3208 | cfg->fc_ifindex != 0, NULL, flags); | |
8c14586f | 3209 | |
b2c709cc | 3210 | return err; |
8c14586f DA |
3211 | } |
3212 | ||
fc1e64e1 DA |
3213 | static int ip6_route_check_nh_onlink(struct net *net, |
3214 | struct fib6_config *cfg, | |
9fbb704c | 3215 | const struct net_device *dev, |
fc1e64e1 DA |
3216 | struct netlink_ext_ack *extack) |
3217 | { | |
b2c709cc | 3218 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
fc1e64e1 | 3219 | const struct in6_addr *gw_addr = &cfg->fc_gateway; |
b2c709cc | 3220 | struct fib6_result res = {}; |
fc1e64e1 DA |
3221 | int err; |
3222 | ||
b2c709cc DA |
3223 | err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res); |
3224 | if (!err && !(res.fib6_flags & RTF_REJECT) && | |
3225 | /* ignore match if it is the default route */ | |
3226 | !ipv6_addr_any(&res.f6i->fib6_dst.addr) && | |
3227 | (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) { | |
3228 | NL_SET_ERR_MSG(extack, | |
3229 | "Nexthop has invalid gateway or device mismatch"); | |
3230 | err = -EINVAL; | |
fc1e64e1 DA |
3231 | } |
3232 | ||
3233 | return err; | |
3234 | } | |
3235 | ||
1edce99f DA |
3236 | static int ip6_route_check_nh(struct net *net, |
3237 | struct fib6_config *cfg, | |
3238 | struct net_device **_dev, | |
3239 | struct inet6_dev **idev) | |
3240 | { | |
3241 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3242 | struct net_device *dev = _dev ? *_dev : NULL; | |
b2c709cc DA |
3243 | int flags = RT6_LOOKUP_F_IFACE; |
3244 | struct fib6_result res = {}; | |
1edce99f DA |
3245 | int err = -EHOSTUNREACH; |
3246 | ||
3247 | if (cfg->fc_table) { | |
b2c709cc DA |
3248 | err = ip6_nh_lookup_table(net, cfg, gw_addr, |
3249 | cfg->fc_table, flags, &res); | |
3250 | /* gw_addr can not require a gateway or resolve to a reject | |
3251 | * route. If a device is given, it must match the result. | |
3252 | */ | |
3253 | if (err || res.fib6_flags & RTF_REJECT || | |
3254 | res.nh->fib_nh_gw_family || | |
3255 | (dev && dev != res.nh->fib_nh_dev)) | |
3256 | err = -EHOSTUNREACH; | |
1edce99f DA |
3257 | } |
3258 | ||
b2c709cc DA |
3259 | if (err < 0) { |
3260 | struct flowi6 fl6 = { | |
3261 | .flowi6_oif = cfg->fc_ifindex, | |
3262 | .daddr = *gw_addr, | |
3263 | }; | |
1edce99f | 3264 | |
b2c709cc DA |
3265 | err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags); |
3266 | if (err || res.fib6_flags & RTF_REJECT || | |
3267 | res.nh->fib_nh_gw_family) | |
3268 | err = -EHOSTUNREACH; | |
3269 | ||
3270 | if (err) | |
3271 | return err; | |
3272 | ||
3273 | fib6_select_path(net, &res, &fl6, cfg->fc_ifindex, | |
3274 | cfg->fc_ifindex != 0, NULL, flags); | |
3275 | } | |
1edce99f | 3276 | |
b2c709cc | 3277 | err = 0; |
1edce99f | 3278 | if (dev) { |
b2c709cc DA |
3279 | if (dev != res.nh->fib_nh_dev) |
3280 | err = -EHOSTUNREACH; | |
1edce99f | 3281 | } else { |
b2c709cc | 3282 | *_dev = dev = res.nh->fib_nh_dev; |
1edce99f | 3283 | dev_hold(dev); |
b2c709cc | 3284 | *idev = in6_dev_get(dev); |
1edce99f DA |
3285 | } |
3286 | ||
1edce99f DA |
3287 | return err; |
3288 | } | |
3289 | ||
9fbb704c DA |
3290 | static int ip6_validate_gw(struct net *net, struct fib6_config *cfg, |
3291 | struct net_device **_dev, struct inet6_dev **idev, | |
3292 | struct netlink_ext_ack *extack) | |
3293 | { | |
3294 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3295 | int gwa_type = ipv6_addr_type(gw_addr); | |
232378e8 | 3296 | bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true; |
9fbb704c | 3297 | const struct net_device *dev = *_dev; |
232378e8 | 3298 | bool need_addr_check = !dev; |
9fbb704c DA |
3299 | int err = -EINVAL; |
3300 | ||
3301 | /* if gw_addr is local we will fail to detect this in case | |
3302 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
3303 | * will return already-added prefix route via interface that | |
3304 | * prefix route was assigned to, which might be non-loopback. | |
3305 | */ | |
232378e8 DA |
3306 | if (dev && |
3307 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3308 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
9fbb704c DA |
3309 | goto out; |
3310 | } | |
3311 | ||
3312 | if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) { | |
3313 | /* IPv6 strictly inhibits using not link-local | |
3314 | * addresses as nexthop address. | |
3315 | * Otherwise, router will not able to send redirects. | |
3316 | * It is very good, but in some (rare!) circumstances | |
3317 | * (SIT, PtP, NBMA NOARP links) it is handy to allow | |
3318 | * some exceptions. --ANK | |
3319 | * We allow IPv4-mapped nexthops to support RFC4798-type | |
3320 | * addressing | |
3321 | */ | |
3322 | if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) { | |
3323 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
3324 | goto out; | |
3325 | } | |
3326 | ||
b2c709cc DA |
3327 | rcu_read_lock(); |
3328 | ||
9fbb704c DA |
3329 | if (cfg->fc_flags & RTNH_F_ONLINK) |
3330 | err = ip6_route_check_nh_onlink(net, cfg, dev, extack); | |
3331 | else | |
3332 | err = ip6_route_check_nh(net, cfg, _dev, idev); | |
3333 | ||
b2c709cc DA |
3334 | rcu_read_unlock(); |
3335 | ||
9fbb704c DA |
3336 | if (err) |
3337 | goto out; | |
3338 | } | |
3339 | ||
3340 | /* reload in case device was changed */ | |
3341 | dev = *_dev; | |
3342 | ||
3343 | err = -EINVAL; | |
3344 | if (!dev) { | |
3345 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
3346 | goto out; | |
3347 | } else if (dev->flags & IFF_LOOPBACK) { | |
3348 | NL_SET_ERR_MSG(extack, | |
3349 | "Egress device can not be loopback device for this route"); | |
3350 | goto out; | |
3351 | } | |
232378e8 DA |
3352 | |
3353 | /* if we did not check gw_addr above, do so now that the | |
3354 | * egress device has been resolved. | |
3355 | */ | |
3356 | if (need_addr_check && | |
3357 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3358 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
3359 | goto out; | |
3360 | } | |
3361 | ||
9fbb704c DA |
3362 | err = 0; |
3363 | out: | |
3364 | return err; | |
3365 | } | |
3366 | ||
83c44251 DA |
3367 | static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) |
3368 | { | |
3369 | if ((flags & RTF_REJECT) || | |
3370 | (dev && (dev->flags & IFF_LOOPBACK) && | |
3371 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
3372 | !(flags & RTF_LOCAL))) | |
3373 | return true; | |
3374 | ||
3375 | return false; | |
3376 | } | |
3377 | ||
3378 | int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, | |
3379 | struct fib6_config *cfg, gfp_t gfp_flags, | |
3380 | struct netlink_ext_ack *extack) | |
3381 | { | |
3382 | struct net_device *dev = NULL; | |
3383 | struct inet6_dev *idev = NULL; | |
3384 | int addr_type; | |
3385 | int err; | |
3386 | ||
f1741730 DA |
3387 | fib6_nh->fib_nh_family = AF_INET6; |
3388 | ||
83c44251 DA |
3389 | err = -ENODEV; |
3390 | if (cfg->fc_ifindex) { | |
3391 | dev = dev_get_by_index(net, cfg->fc_ifindex); | |
3392 | if (!dev) | |
3393 | goto out; | |
3394 | idev = in6_dev_get(dev); | |
3395 | if (!idev) | |
3396 | goto out; | |
3397 | } | |
3398 | ||
3399 | if (cfg->fc_flags & RTNH_F_ONLINK) { | |
3400 | if (!dev) { | |
3401 | NL_SET_ERR_MSG(extack, | |
3402 | "Nexthop device required for onlink"); | |
3403 | goto out; | |
3404 | } | |
3405 | ||
3406 | if (!(dev->flags & IFF_UP)) { | |
3407 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3408 | err = -ENETDOWN; | |
3409 | goto out; | |
3410 | } | |
3411 | ||
ad1601ae | 3412 | fib6_nh->fib_nh_flags |= RTNH_F_ONLINK; |
83c44251 DA |
3413 | } |
3414 | ||
ad1601ae | 3415 | fib6_nh->fib_nh_weight = 1; |
83c44251 DA |
3416 | |
3417 | /* We cannot add true routes via loopback here, | |
3418 | * they would result in kernel looping; promote them to reject routes | |
3419 | */ | |
3420 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3421 | if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) { | |
3422 | /* hold loopback dev/idev if we haven't done so. */ | |
3423 | if (dev != net->loopback_dev) { | |
3424 | if (dev) { | |
3425 | dev_put(dev); | |
3426 | in6_dev_put(idev); | |
3427 | } | |
3428 | dev = net->loopback_dev; | |
3429 | dev_hold(dev); | |
3430 | idev = in6_dev_get(dev); | |
3431 | if (!idev) { | |
3432 | err = -ENODEV; | |
3433 | goto out; | |
3434 | } | |
3435 | } | |
7dd73168 | 3436 | goto pcpu_alloc; |
83c44251 DA |
3437 | } |
3438 | ||
3439 | if (cfg->fc_flags & RTF_GATEWAY) { | |
3440 | err = ip6_validate_gw(net, cfg, &dev, &idev, extack); | |
3441 | if (err) | |
3442 | goto out; | |
3443 | ||
ad1601ae | 3444 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; |
bdf00467 | 3445 | fib6_nh->fib_nh_gw_family = AF_INET6; |
83c44251 DA |
3446 | } |
3447 | ||
3448 | err = -ENODEV; | |
3449 | if (!dev) | |
3450 | goto out; | |
3451 | ||
3452 | if (idev->cnf.disable_ipv6) { | |
3453 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device"); | |
3454 | err = -EACCES; | |
3455 | goto out; | |
3456 | } | |
3457 | ||
3458 | if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) { | |
3459 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3460 | err = -ENETDOWN; | |
3461 | goto out; | |
3462 | } | |
3463 | ||
3464 | if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) && | |
3465 | !netif_carrier_ok(dev)) | |
ad1601ae | 3466 | fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
83c44251 | 3467 | |
7dd73168 DA |
3468 | err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap, |
3469 | cfg->fc_encap_type, cfg, gfp_flags, extack); | |
3470 | if (err) | |
3471 | goto out; | |
3472 | ||
3473 | pcpu_alloc: | |
f40b6ae2 DA |
3474 | fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); |
3475 | if (!fib6_nh->rt6i_pcpu) { | |
3476 | err = -ENOMEM; | |
3477 | goto out; | |
3478 | } | |
3479 | ||
ad1601ae | 3480 | fib6_nh->fib_nh_dev = dev; |
f1741730 | 3481 | fib6_nh->fib_nh_oif = dev->ifindex; |
83c44251 DA |
3482 | err = 0; |
3483 | out: | |
3484 | if (idev) | |
3485 | in6_dev_put(idev); | |
3486 | ||
3487 | if (err) { | |
ad1601ae DA |
3488 | lwtstate_put(fib6_nh->fib_nh_lws); |
3489 | fib6_nh->fib_nh_lws = NULL; | |
83c44251 DA |
3490 | if (dev) |
3491 | dev_put(dev); | |
3492 | } | |
3493 | ||
3494 | return err; | |
3495 | } | |
3496 | ||
dac7d0f2 DA |
3497 | void fib6_nh_release(struct fib6_nh *fib6_nh) |
3498 | { | |
cc5c073a DA |
3499 | struct rt6_exception_bucket *bucket; |
3500 | ||
3501 | rcu_read_lock(); | |
3502 | ||
3503 | fib6_nh_flush_exceptions(fib6_nh, NULL); | |
3504 | bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL); | |
3505 | if (bucket) { | |
3506 | rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL); | |
3507 | kfree(bucket); | |
3508 | } | |
3509 | ||
3510 | rcu_read_unlock(); | |
3511 | ||
f40b6ae2 DA |
3512 | if (fib6_nh->rt6i_pcpu) { |
3513 | int cpu; | |
3514 | ||
3515 | for_each_possible_cpu(cpu) { | |
3516 | struct rt6_info **ppcpu_rt; | |
3517 | struct rt6_info *pcpu_rt; | |
3518 | ||
3519 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3520 | pcpu_rt = *ppcpu_rt; | |
3521 | if (pcpu_rt) { | |
3522 | dst_dev_put(&pcpu_rt->dst); | |
3523 | dst_release(&pcpu_rt->dst); | |
3524 | *ppcpu_rt = NULL; | |
3525 | } | |
3526 | } | |
3527 | ||
3528 | free_percpu(fib6_nh->rt6i_pcpu); | |
3529 | } | |
3530 | ||
979e276e | 3531 | fib_nh_common_release(&fib6_nh->nh_common); |
dac7d0f2 DA |
3532 | } |
3533 | ||
8d1c802b | 3534 | static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, |
acb54e3c | 3535 | gfp_t gfp_flags, |
333c4301 | 3536 | struct netlink_ext_ack *extack) |
1da177e4 | 3537 | { |
5578689a | 3538 | struct net *net = cfg->fc_nlinfo.nl_net; |
8d1c802b | 3539 | struct fib6_info *rt = NULL; |
f88d8ea6 | 3540 | struct nexthop *nh = NULL; |
c71099ac | 3541 | struct fib6_table *table; |
f88d8ea6 | 3542 | struct fib6_nh *fib6_nh; |
8c5b83f0 | 3543 | int err = -EINVAL; |
83c44251 | 3544 | int addr_type; |
1da177e4 | 3545 | |
557c44be | 3546 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
3547 | if (cfg->fc_flags & RTF_PCPU) { |
3548 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 3549 | goto out; |
d5d531cb | 3550 | } |
557c44be | 3551 | |
2ea2352e WW |
3552 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
3553 | if (cfg->fc_flags & RTF_CACHE) { | |
3554 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
3555 | goto out; | |
3556 | } | |
3557 | ||
e8478e80 DA |
3558 | if (cfg->fc_type > RTN_MAX) { |
3559 | NL_SET_ERR_MSG(extack, "Invalid route type"); | |
3560 | goto out; | |
3561 | } | |
3562 | ||
d5d531cb DA |
3563 | if (cfg->fc_dst_len > 128) { |
3564 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
3565 | goto out; | |
3566 | } | |
3567 | if (cfg->fc_src_len > 128) { | |
3568 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 3569 | goto out; |
d5d531cb | 3570 | } |
1da177e4 | 3571 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
3572 | if (cfg->fc_src_len) { |
3573 | NL_SET_ERR_MSG(extack, | |
3574 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 3575 | goto out; |
d5d531cb | 3576 | } |
1da177e4 | 3577 | #endif |
5b98324e DA |
3578 | if (cfg->fc_nh_id) { |
3579 | nh = nexthop_find_by_id(net, cfg->fc_nh_id); | |
3580 | if (!nh) { | |
3581 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
3582 | goto out; | |
3583 | } | |
3584 | err = fib6_check_nexthop(nh, cfg, extack); | |
3585 | if (err) | |
3586 | goto out; | |
3587 | } | |
fc1e64e1 | 3588 | |
d71314b4 | 3589 | err = -ENOBUFS; |
38308473 DM |
3590 | if (cfg->fc_nlinfo.nlh && |
3591 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 3592 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 3593 | if (!table) { |
f3213831 | 3594 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
3595 | table = fib6_new_table(net, cfg->fc_table); |
3596 | } | |
3597 | } else { | |
3598 | table = fib6_new_table(net, cfg->fc_table); | |
3599 | } | |
38308473 DM |
3600 | |
3601 | if (!table) | |
c71099ac | 3602 | goto out; |
c71099ac | 3603 | |
93531c67 | 3604 | err = -ENOMEM; |
f88d8ea6 | 3605 | rt = fib6_info_alloc(gfp_flags, !nh); |
93531c67 | 3606 | if (!rt) |
1da177e4 | 3607 | goto out; |
93531c67 | 3608 | |
d7e774f3 DA |
3609 | rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len, |
3610 | extack); | |
767a2217 DA |
3611 | if (IS_ERR(rt->fib6_metrics)) { |
3612 | err = PTR_ERR(rt->fib6_metrics); | |
fda21d46 ED |
3613 | /* Do not leave garbage there. */ |
3614 | rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; | |
767a2217 DA |
3615 | goto out; |
3616 | } | |
3617 | ||
93531c67 DA |
3618 | if (cfg->fc_flags & RTF_ADDRCONF) |
3619 | rt->dst_nocount = true; | |
1da177e4 | 3620 | |
1716a961 | 3621 | if (cfg->fc_flags & RTF_EXPIRES) |
14895687 | 3622 | fib6_set_expires(rt, jiffies + |
1716a961 G |
3623 | clock_t_to_jiffies(cfg->fc_expires)); |
3624 | else | |
14895687 | 3625 | fib6_clean_expires(rt); |
1da177e4 | 3626 | |
86872cb5 TG |
3627 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
3628 | cfg->fc_protocol = RTPROT_BOOT; | |
93c2fb25 | 3629 | rt->fib6_protocol = cfg->fc_protocol; |
86872cb5 | 3630 | |
83c44251 DA |
3631 | rt->fib6_table = table; |
3632 | rt->fib6_metric = cfg->fc_metric; | |
c7036d97 | 3633 | rt->fib6_type = cfg->fc_type ? : RTN_UNICAST; |
2b2450ca | 3634 | rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; |
19e42e45 | 3635 | |
93c2fb25 DA |
3636 | ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
3637 | rt->fib6_dst.plen = cfg->fc_dst_len; | |
3638 | if (rt->fib6_dst.plen == 128) | |
3b6761d1 | 3639 | rt->dst_host = true; |
e5fd387a | 3640 | |
1da177e4 | 3641 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
3642 | ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len); |
3643 | rt->fib6_src.plen = cfg->fc_src_len; | |
1da177e4 | 3644 | #endif |
f88d8ea6 DA |
3645 | if (nh) { |
3646 | if (!nexthop_get(nh)) { | |
3647 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
3648 | goto out; | |
3649 | } | |
3650 | if (rt->fib6_src.plen) { | |
4daa95af | 3651 | NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing"); |
f88d8ea6 DA |
3652 | goto out; |
3653 | } | |
3654 | rt->nh = nh; | |
3655 | fib6_nh = nexthop_fib6_nh(rt->nh); | |
3656 | } else { | |
3657 | err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack); | |
3658 | if (err) | |
3659 | goto out; | |
1da177e4 | 3660 | |
f88d8ea6 DA |
3661 | fib6_nh = rt->fib6_nh; |
3662 | ||
3663 | /* We cannot add true routes via loopback here, they would | |
3664 | * result in kernel looping; promote them to reject routes | |
3665 | */ | |
3666 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3667 | if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev, | |
3668 | addr_type)) | |
3669 | rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP; | |
3670 | } | |
955ec4cb | 3671 | |
c3968a85 | 3672 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
f88d8ea6 | 3673 | struct net_device *dev = fib6_nh->fib_nh_dev; |
83c44251 | 3674 | |
c3968a85 | 3675 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
d5d531cb | 3676 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
3677 | err = -EINVAL; |
3678 | goto out; | |
3679 | } | |
93c2fb25 DA |
3680 | rt->fib6_prefsrc.addr = cfg->fc_prefsrc; |
3681 | rt->fib6_prefsrc.plen = 128; | |
c3968a85 | 3682 | } else |
93c2fb25 | 3683 | rt->fib6_prefsrc.plen = 0; |
c3968a85 | 3684 | |
8c5b83f0 | 3685 | return rt; |
6b9ea5a6 | 3686 | out: |
93531c67 | 3687 | fib6_info_release(rt); |
8c5b83f0 | 3688 | return ERR_PTR(err); |
6b9ea5a6 RP |
3689 | } |
3690 | ||
acb54e3c | 3691 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
333c4301 | 3692 | struct netlink_ext_ack *extack) |
6b9ea5a6 | 3693 | { |
8d1c802b | 3694 | struct fib6_info *rt; |
6b9ea5a6 RP |
3695 | int err; |
3696 | ||
acb54e3c | 3697 | rt = ip6_route_info_create(cfg, gfp_flags, extack); |
d4ead6b3 DA |
3698 | if (IS_ERR(rt)) |
3699 | return PTR_ERR(rt); | |
6b9ea5a6 | 3700 | |
d4ead6b3 | 3701 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack); |
93531c67 | 3702 | fib6_info_release(rt); |
6b9ea5a6 | 3703 | |
1da177e4 LT |
3704 | return err; |
3705 | } | |
3706 | ||
8d1c802b | 3707 | static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 3708 | { |
afb1d4b5 | 3709 | struct net *net = info->nl_net; |
c71099ac | 3710 | struct fib6_table *table; |
afb1d4b5 | 3711 | int err; |
1da177e4 | 3712 | |
421842ed | 3713 | if (rt == net->ipv6.fib6_null_entry) { |
6825a26c G |
3714 | err = -ENOENT; |
3715 | goto out; | |
3716 | } | |
6c813a72 | 3717 | |
93c2fb25 | 3718 | table = rt->fib6_table; |
66f5d6ce | 3719 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 3720 | err = fib6_del(rt, info); |
66f5d6ce | 3721 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 3722 | |
6825a26c | 3723 | out: |
93531c67 | 3724 | fib6_info_release(rt); |
1da177e4 LT |
3725 | return err; |
3726 | } | |
3727 | ||
8d1c802b | 3728 | int ip6_del_rt(struct net *net, struct fib6_info *rt) |
e0a1ad73 | 3729 | { |
afb1d4b5 DA |
3730 | struct nl_info info = { .nl_net = net }; |
3731 | ||
528c4ceb | 3732 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
3733 | } |
3734 | ||
8d1c802b | 3735 | static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg) |
0ae81335 DA |
3736 | { |
3737 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 3738 | struct net *net = info->nl_net; |
16a16cd3 | 3739 | struct sk_buff *skb = NULL; |
0ae81335 | 3740 | struct fib6_table *table; |
e3330039 | 3741 | int err = -ENOENT; |
0ae81335 | 3742 | |
421842ed | 3743 | if (rt == net->ipv6.fib6_null_entry) |
e3330039 | 3744 | goto out_put; |
93c2fb25 | 3745 | table = rt->fib6_table; |
66f5d6ce | 3746 | spin_lock_bh(&table->tb6_lock); |
0ae81335 | 3747 | |
93c2fb25 | 3748 | if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) { |
8d1c802b | 3749 | struct fib6_info *sibling, *next_sibling; |
0ae81335 | 3750 | |
16a16cd3 DA |
3751 | /* prefer to send a single notification with all hops */ |
3752 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
3753 | if (skb) { | |
3754 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
3755 | ||
d4ead6b3 | 3756 | if (rt6_fill_node(net, skb, rt, NULL, |
16a16cd3 DA |
3757 | NULL, NULL, 0, RTM_DELROUTE, |
3758 | info->portid, seq, 0) < 0) { | |
3759 | kfree_skb(skb); | |
3760 | skb = NULL; | |
3761 | } else | |
3762 | info->skip_notify = 1; | |
3763 | } | |
3764 | ||
2881fd61 IS |
3765 | info->skip_notify_kernel = 1; |
3766 | call_fib6_multipath_entry_notifiers(net, | |
3767 | FIB_EVENT_ENTRY_DEL, | |
3768 | rt, | |
3769 | rt->fib6_nsiblings, | |
3770 | NULL); | |
0ae81335 | 3771 | list_for_each_entry_safe(sibling, next_sibling, |
93c2fb25 DA |
3772 | &rt->fib6_siblings, |
3773 | fib6_siblings) { | |
0ae81335 DA |
3774 | err = fib6_del(sibling, info); |
3775 | if (err) | |
e3330039 | 3776 | goto out_unlock; |
0ae81335 DA |
3777 | } |
3778 | } | |
3779 | ||
3780 | err = fib6_del(rt, info); | |
e3330039 | 3781 | out_unlock: |
66f5d6ce | 3782 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 3783 | out_put: |
93531c67 | 3784 | fib6_info_release(rt); |
16a16cd3 DA |
3785 | |
3786 | if (skb) { | |
e3330039 | 3787 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
3788 | info->nlh, gfp_any()); |
3789 | } | |
0ae81335 DA |
3790 | return err; |
3791 | } | |
3792 | ||
0fa6efc5 | 3793 | static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg) |
23fb93a4 DA |
3794 | { |
3795 | int rc = -ESRCH; | |
3796 | ||
3797 | if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex) | |
3798 | goto out; | |
3799 | ||
3800 | if (cfg->fc_flags & RTF_GATEWAY && | |
3801 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
3802 | goto out; | |
761f6026 XL |
3803 | |
3804 | rc = rt6_remove_exception_rt(rt); | |
23fb93a4 DA |
3805 | out: |
3806 | return rc; | |
3807 | } | |
3808 | ||
0fa6efc5 DA |
3809 | static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt, |
3810 | struct fib6_nh *nh) | |
3811 | { | |
3812 | struct fib6_result res = { | |
3813 | .f6i = rt, | |
3814 | .nh = nh, | |
3815 | }; | |
3816 | struct rt6_info *rt_cache; | |
3817 | ||
3818 | rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src); | |
3819 | if (rt_cache) | |
3820 | return __ip6_del_cached_rt(rt_cache, cfg); | |
3821 | ||
3822 | return 0; | |
3823 | } | |
3824 | ||
5b98324e DA |
3825 | struct fib6_nh_del_cached_rt_arg { |
3826 | struct fib6_config *cfg; | |
3827 | struct fib6_info *f6i; | |
3828 | }; | |
3829 | ||
3830 | static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg) | |
3831 | { | |
3832 | struct fib6_nh_del_cached_rt_arg *arg = _arg; | |
3833 | int rc; | |
3834 | ||
3835 | rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh); | |
3836 | return rc != -ESRCH ? rc : 0; | |
3837 | } | |
3838 | ||
3839 | static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i) | |
3840 | { | |
3841 | struct fib6_nh_del_cached_rt_arg arg = { | |
3842 | .cfg = cfg, | |
3843 | .f6i = f6i | |
3844 | }; | |
3845 | ||
3846 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg); | |
3847 | } | |
3848 | ||
333c4301 DA |
3849 | static int ip6_route_del(struct fib6_config *cfg, |
3850 | struct netlink_ext_ack *extack) | |
1da177e4 | 3851 | { |
c71099ac | 3852 | struct fib6_table *table; |
8d1c802b | 3853 | struct fib6_info *rt; |
1da177e4 | 3854 | struct fib6_node *fn; |
1da177e4 LT |
3855 | int err = -ESRCH; |
3856 | ||
5578689a | 3857 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
3858 | if (!table) { |
3859 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 3860 | return err; |
d5d531cb | 3861 | } |
c71099ac | 3862 | |
66f5d6ce | 3863 | rcu_read_lock(); |
1da177e4 | 3864 | |
c71099ac | 3865 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 3866 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 3867 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 3868 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 3869 | |
1da177e4 | 3870 | if (fn) { |
66f5d6ce | 3871 | for_each_fib6_node_rt_rcu(fn) { |
ad1601ae DA |
3872 | struct fib6_nh *nh; |
3873 | ||
3401bfb1 SB |
3874 | if (rt->nh && cfg->fc_nh_id && |
3875 | rt->nh->id != cfg->fc_nh_id) | |
5b98324e | 3876 | continue; |
23fb93a4 | 3877 | |
5b98324e DA |
3878 | if (cfg->fc_flags & RTF_CACHE) { |
3879 | int rc = 0; | |
3880 | ||
3881 | if (rt->nh) { | |
3882 | rc = ip6_del_cached_rt_nh(cfg, rt); | |
3883 | } else if (cfg->fc_nh_id) { | |
3884 | continue; | |
3885 | } else { | |
3886 | nh = rt->fib6_nh; | |
3887 | rc = ip6_del_cached_rt(cfg, rt, nh); | |
3888 | } | |
0fa6efc5 DA |
3889 | if (rc != -ESRCH) { |
3890 | rcu_read_unlock(); | |
3891 | return rc; | |
23fb93a4 DA |
3892 | } |
3893 | continue; | |
2b760fcf | 3894 | } |
ad1601ae | 3895 | |
5b98324e DA |
3896 | if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric) |
3897 | continue; | |
3898 | if (cfg->fc_protocol && | |
3899 | cfg->fc_protocol != rt->fib6_protocol) | |
3900 | continue; | |
3901 | ||
3902 | if (rt->nh) { | |
3903 | if (!fib6_info_hold_safe(rt)) | |
3904 | continue; | |
3905 | rcu_read_unlock(); | |
3906 | ||
3907 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
3908 | } | |
3909 | if (cfg->fc_nh_id) | |
3910 | continue; | |
3911 | ||
3912 | nh = rt->fib6_nh; | |
86872cb5 | 3913 | if (cfg->fc_ifindex && |
ad1601ae DA |
3914 | (!nh->fib_nh_dev || |
3915 | nh->fib_nh_dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 3916 | continue; |
86872cb5 | 3917 | if (cfg->fc_flags & RTF_GATEWAY && |
ad1601ae | 3918 | !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6)) |
1da177e4 | 3919 | continue; |
e873e4b9 WW |
3920 | if (!fib6_info_hold_safe(rt)) |
3921 | continue; | |
66f5d6ce | 3922 | rcu_read_unlock(); |
1da177e4 | 3923 | |
0ae81335 DA |
3924 | /* if gateway was specified only delete the one hop */ |
3925 | if (cfg->fc_flags & RTF_GATEWAY) | |
3926 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
3927 | ||
3928 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
3929 | } |
3930 | } | |
66f5d6ce | 3931 | rcu_read_unlock(); |
1da177e4 LT |
3932 | |
3933 | return err; | |
3934 | } | |
3935 | ||
6700c270 | 3936 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 3937 | { |
a6279458 | 3938 | struct netevent_redirect netevent; |
e8599ff4 | 3939 | struct rt6_info *rt, *nrt = NULL; |
85bd05de | 3940 | struct fib6_result res = {}; |
e8599ff4 DM |
3941 | struct ndisc_options ndopts; |
3942 | struct inet6_dev *in6_dev; | |
3943 | struct neighbour *neigh; | |
71bcdba0 | 3944 | struct rd_msg *msg; |
6e157b6a DM |
3945 | int optlen, on_link; |
3946 | u8 *lladdr; | |
e8599ff4 | 3947 | |
29a3cad5 | 3948 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 3949 | optlen -= sizeof(*msg); |
e8599ff4 DM |
3950 | |
3951 | if (optlen < 0) { | |
6e157b6a | 3952 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
3953 | return; |
3954 | } | |
3955 | ||
71bcdba0 | 3956 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 3957 | |
71bcdba0 | 3958 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 3959 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
3960 | return; |
3961 | } | |
3962 | ||
6e157b6a | 3963 | on_link = 0; |
71bcdba0 | 3964 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 3965 | on_link = 1; |
71bcdba0 | 3966 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 3967 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 3968 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
3969 | return; |
3970 | } | |
3971 | ||
3972 | in6_dev = __in6_dev_get(skb->dev); | |
3973 | if (!in6_dev) | |
3974 | return; | |
3975 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
3976 | return; | |
3977 | ||
3978 | /* RFC2461 8.1: | |
3979 | * The IP source address of the Redirect MUST be the same as the current | |
3980 | * first-hop router for the specified ICMP Destination Address. | |
3981 | */ | |
3982 | ||
f997c55c | 3983 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
3984 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
3985 | return; | |
3986 | } | |
6e157b6a DM |
3987 | |
3988 | lladdr = NULL; | |
e8599ff4 DM |
3989 | if (ndopts.nd_opts_tgt_lladdr) { |
3990 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
3991 | skb->dev); | |
3992 | if (!lladdr) { | |
3993 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
3994 | return; | |
3995 | } | |
3996 | } | |
3997 | ||
6e157b6a | 3998 | rt = (struct rt6_info *) dst; |
ec13ad1d | 3999 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 4000 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 4001 | return; |
6e157b6a | 4002 | } |
e8599ff4 | 4003 | |
6e157b6a DM |
4004 | /* Redirect received -> path was valid. |
4005 | * Look, redirects are sent only in response to data packets, | |
4006 | * so that this nexthop apparently is reachable. --ANK | |
4007 | */ | |
0dec879f | 4008 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 4009 | |
71bcdba0 | 4010 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
4011 | if (!neigh) |
4012 | return; | |
a6279458 | 4013 | |
1da177e4 LT |
4014 | /* |
4015 | * We have finally decided to accept it. | |
4016 | */ | |
4017 | ||
f997c55c | 4018 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
4019 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
4020 | NEIGH_UPDATE_F_OVERRIDE| | |
4021 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
4022 | NEIGH_UPDATE_F_ISROUTER)), |
4023 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 4024 | |
4d85cd0c | 4025 | rcu_read_lock(); |
85bd05de | 4026 | res.f6i = rcu_dereference(rt->from); |
ff24e498 | 4027 | if (!res.f6i) |
886b7a50 | 4028 | goto out; |
8a14e46f | 4029 | |
49d5b8ef DA |
4030 | if (res.f6i->nh) { |
4031 | struct fib6_nh_match_arg arg = { | |
4032 | .dev = dst->dev, | |
4033 | .gw = &rt->rt6i_gateway, | |
4034 | }; | |
4035 | ||
4036 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
4037 | fib6_nh_find_match, &arg); | |
4038 | ||
4039 | /* fib6_info uses a nexthop that does not have fib6_nh | |
4040 | * using the dst->dev. Should be impossible | |
4041 | */ | |
4042 | if (!arg.match) | |
4043 | goto out; | |
4044 | res.nh = arg.match; | |
4045 | } else { | |
4046 | res.nh = res.f6i->fib6_nh; | |
4047 | } | |
4048 | ||
7d21fec9 DA |
4049 | res.fib6_flags = res.f6i->fib6_flags; |
4050 | res.fib6_type = res.f6i->fib6_type; | |
85bd05de | 4051 | nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); |
38308473 | 4052 | if (!nrt) |
1da177e4 LT |
4053 | goto out; |
4054 | ||
4055 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
4056 | if (on_link) | |
4057 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
4058 | ||
4e3fd7a0 | 4059 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 4060 | |
886b7a50 | 4061 | /* rt6_insert_exception() will take care of duplicated exceptions */ |
5012f0a5 | 4062 | if (rt6_insert_exception(nrt, &res)) { |
2b760fcf WW |
4063 | dst_release_immediate(&nrt->dst); |
4064 | goto out; | |
4065 | } | |
1da177e4 | 4066 | |
d8d1f30b CG |
4067 | netevent.old = &rt->dst; |
4068 | netevent.new = &nrt->dst; | |
71bcdba0 | 4069 | netevent.daddr = &msg->dest; |
60592833 | 4070 | netevent.neigh = neigh; |
8d71740c TT |
4071 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
4072 | ||
1da177e4 | 4073 | out: |
886b7a50 | 4074 | rcu_read_unlock(); |
e8599ff4 | 4075 | neigh_release(neigh); |
6e157b6a DM |
4076 | } |
4077 | ||
70ceb4f5 | 4078 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 4079 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 4080 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4081 | const struct in6_addr *gwaddr, |
4082 | struct net_device *dev) | |
70ceb4f5 | 4083 | { |
830218c1 DA |
4084 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4085 | int ifindex = dev->ifindex; | |
70ceb4f5 | 4086 | struct fib6_node *fn; |
8d1c802b | 4087 | struct fib6_info *rt = NULL; |
c71099ac TG |
4088 | struct fib6_table *table; |
4089 | ||
830218c1 | 4090 | table = fib6_get_table(net, tb_id); |
38308473 | 4091 | if (!table) |
c71099ac | 4092 | return NULL; |
70ceb4f5 | 4093 | |
66f5d6ce | 4094 | rcu_read_lock(); |
38fbeeee | 4095 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
4096 | if (!fn) |
4097 | goto out; | |
4098 | ||
66f5d6ce | 4099 | for_each_fib6_node_rt_rcu(fn) { |
f88d8ea6 DA |
4100 | /* these routes do not use nexthops */ |
4101 | if (rt->nh) | |
4102 | continue; | |
1cf844c7 | 4103 | if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex) |
70ceb4f5 | 4104 | continue; |
2b2450ca | 4105 | if (!(rt->fib6_flags & RTF_ROUTEINFO) || |
1cf844c7 | 4106 | !rt->fib6_nh->fib_nh_gw_family) |
70ceb4f5 | 4107 | continue; |
1cf844c7 | 4108 | if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr)) |
70ceb4f5 | 4109 | continue; |
e873e4b9 WW |
4110 | if (!fib6_info_hold_safe(rt)) |
4111 | continue; | |
70ceb4f5 YH |
4112 | break; |
4113 | } | |
4114 | out: | |
66f5d6ce | 4115 | rcu_read_unlock(); |
70ceb4f5 YH |
4116 | return rt; |
4117 | } | |
4118 | ||
8d1c802b | 4119 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 4120 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4121 | const struct in6_addr *gwaddr, |
4122 | struct net_device *dev, | |
95c96174 | 4123 | unsigned int pref) |
70ceb4f5 | 4124 | { |
86872cb5 | 4125 | struct fib6_config cfg = { |
238fc7ea | 4126 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 4127 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
4128 | .fc_dst_len = prefixlen, |
4129 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
4130 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 4131 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4132 | .fc_type = RTN_UNICAST, |
15e47304 | 4133 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
4134 | .fc_nlinfo.nlh = NULL, |
4135 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
4136 | }; |
4137 | ||
830218c1 | 4138 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
4139 | cfg.fc_dst = *prefix; |
4140 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 4141 | |
e317da96 YH |
4142 | /* We should treat it as a default route if prefix length is 0. */ |
4143 | if (!prefixlen) | |
86872cb5 | 4144 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 4145 | |
acb54e3c | 4146 | ip6_route_add(&cfg, GFP_ATOMIC, NULL); |
70ceb4f5 | 4147 | |
830218c1 | 4148 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
4149 | } |
4150 | #endif | |
4151 | ||
8d1c802b | 4152 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 DA |
4153 | const struct in6_addr *addr, |
4154 | struct net_device *dev) | |
1ab1457c | 4155 | { |
830218c1 | 4156 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
8d1c802b | 4157 | struct fib6_info *rt; |
c71099ac | 4158 | struct fib6_table *table; |
1da177e4 | 4159 | |
afb1d4b5 | 4160 | table = fib6_get_table(net, tb_id); |
38308473 | 4161 | if (!table) |
c71099ac | 4162 | return NULL; |
1da177e4 | 4163 | |
66f5d6ce WW |
4164 | rcu_read_lock(); |
4165 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
f88d8ea6 | 4166 | struct fib6_nh *nh; |
ad1601ae | 4167 | |
f88d8ea6 DA |
4168 | /* RA routes do not use nexthops */ |
4169 | if (rt->nh) | |
4170 | continue; | |
4171 | ||
4172 | nh = rt->fib6_nh; | |
ad1601ae | 4173 | if (dev == nh->fib_nh_dev && |
93c2fb25 | 4174 | ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
ad1601ae | 4175 | ipv6_addr_equal(&nh->fib_nh_gw6, addr)) |
1da177e4 LT |
4176 | break; |
4177 | } | |
e873e4b9 WW |
4178 | if (rt && !fib6_info_hold_safe(rt)) |
4179 | rt = NULL; | |
66f5d6ce | 4180 | rcu_read_unlock(); |
1da177e4 LT |
4181 | return rt; |
4182 | } | |
4183 | ||
8d1c802b | 4184 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 4185 | const struct in6_addr *gwaddr, |
ebacaaa0 YH |
4186 | struct net_device *dev, |
4187 | unsigned int pref) | |
1da177e4 | 4188 | { |
86872cb5 | 4189 | struct fib6_config cfg = { |
ca254490 | 4190 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 4191 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
4192 | .fc_ifindex = dev->ifindex, |
4193 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
4194 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 4195 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4196 | .fc_type = RTN_UNICAST, |
15e47304 | 4197 | .fc_nlinfo.portid = 0, |
5578689a | 4198 | .fc_nlinfo.nlh = NULL, |
afb1d4b5 | 4199 | .fc_nlinfo.nl_net = net, |
86872cb5 | 4200 | }; |
1da177e4 | 4201 | |
4e3fd7a0 | 4202 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 4203 | |
acb54e3c | 4204 | if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) { |
830218c1 DA |
4205 | struct fib6_table *table; |
4206 | ||
4207 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
4208 | if (table) | |
4209 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
4210 | } | |
1da177e4 | 4211 | |
afb1d4b5 | 4212 | return rt6_get_dflt_router(net, gwaddr, dev); |
1da177e4 LT |
4213 | } |
4214 | ||
afb1d4b5 DA |
4215 | static void __rt6_purge_dflt_routers(struct net *net, |
4216 | struct fib6_table *table) | |
1da177e4 | 4217 | { |
8d1c802b | 4218 | struct fib6_info *rt; |
1da177e4 LT |
4219 | |
4220 | restart: | |
66f5d6ce WW |
4221 | rcu_read_lock(); |
4222 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
dcd1f572 DA |
4223 | struct net_device *dev = fib6_info_nh_dev(rt); |
4224 | struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; | |
4225 | ||
93c2fb25 | 4226 | if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
e873e4b9 WW |
4227 | (!idev || idev->cnf.accept_ra != 2) && |
4228 | fib6_info_hold_safe(rt)) { | |
93531c67 DA |
4229 | rcu_read_unlock(); |
4230 | ip6_del_rt(net, rt); | |
1da177e4 LT |
4231 | goto restart; |
4232 | } | |
4233 | } | |
66f5d6ce | 4234 | rcu_read_unlock(); |
830218c1 DA |
4235 | |
4236 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
4237 | } | |
4238 | ||
4239 | void rt6_purge_dflt_routers(struct net *net) | |
4240 | { | |
4241 | struct fib6_table *table; | |
4242 | struct hlist_head *head; | |
4243 | unsigned int h; | |
4244 | ||
4245 | rcu_read_lock(); | |
4246 | ||
4247 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
4248 | head = &net->ipv6.fib_table_hash[h]; | |
4249 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
4250 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
afb1d4b5 | 4251 | __rt6_purge_dflt_routers(net, table); |
830218c1 DA |
4252 | } |
4253 | } | |
4254 | ||
4255 | rcu_read_unlock(); | |
1da177e4 LT |
4256 | } |
4257 | ||
5578689a DL |
4258 | static void rtmsg_to_fib6_config(struct net *net, |
4259 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
4260 | struct fib6_config *cfg) |
4261 | { | |
8823a3ac MŻ |
4262 | *cfg = (struct fib6_config){ |
4263 | .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? | |
4264 | : RT6_TABLE_MAIN, | |
4265 | .fc_ifindex = rtmsg->rtmsg_ifindex, | |
67f69513 | 4266 | .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER, |
8823a3ac MŻ |
4267 | .fc_expires = rtmsg->rtmsg_info, |
4268 | .fc_dst_len = rtmsg->rtmsg_dst_len, | |
4269 | .fc_src_len = rtmsg->rtmsg_src_len, | |
4270 | .fc_flags = rtmsg->rtmsg_flags, | |
4271 | .fc_type = rtmsg->rtmsg_type, | |
4272 | ||
4273 | .fc_nlinfo.nl_net = net, | |
4274 | ||
4275 | .fc_dst = rtmsg->rtmsg_dst, | |
4276 | .fc_src = rtmsg->rtmsg_src, | |
4277 | .fc_gateway = rtmsg->rtmsg_gateway, | |
4278 | }; | |
86872cb5 TG |
4279 | } |
4280 | ||
5578689a | 4281 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 4282 | { |
86872cb5 | 4283 | struct fib6_config cfg; |
1da177e4 LT |
4284 | struct in6_rtmsg rtmsg; |
4285 | int err; | |
4286 | ||
67ba4152 | 4287 | switch (cmd) { |
1da177e4 LT |
4288 | case SIOCADDRT: /* Add a route */ |
4289 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 4290 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
4291 | return -EPERM; |
4292 | err = copy_from_user(&rtmsg, arg, | |
4293 | sizeof(struct in6_rtmsg)); | |
4294 | if (err) | |
4295 | return -EFAULT; | |
86872cb5 | 4296 | |
5578689a | 4297 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 4298 | |
1da177e4 LT |
4299 | rtnl_lock(); |
4300 | switch (cmd) { | |
4301 | case SIOCADDRT: | |
acb54e3c | 4302 | err = ip6_route_add(&cfg, GFP_KERNEL, NULL); |
1da177e4 LT |
4303 | break; |
4304 | case SIOCDELRT: | |
333c4301 | 4305 | err = ip6_route_del(&cfg, NULL); |
1da177e4 LT |
4306 | break; |
4307 | default: | |
4308 | err = -EINVAL; | |
4309 | } | |
4310 | rtnl_unlock(); | |
4311 | ||
4312 | return err; | |
3ff50b79 | 4313 | } |
1da177e4 LT |
4314 | |
4315 | return -EINVAL; | |
4316 | } | |
4317 | ||
4318 | /* | |
4319 | * Drop the packet on the floor | |
4320 | */ | |
4321 | ||
d5fdd6ba | 4322 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 4323 | { |
adf30907 | 4324 | struct dst_entry *dst = skb_dst(skb); |
1d3fd8a1 SS |
4325 | struct net *net = dev_net(dst->dev); |
4326 | struct inet6_dev *idev; | |
4327 | int type; | |
4328 | ||
4329 | if (netif_is_l3_master(skb->dev) && | |
4330 | dst->dev == net->loopback_dev) | |
4331 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); | |
4332 | else | |
4333 | idev = ip6_dst_idev(dst); | |
4334 | ||
612f09e8 YH |
4335 | switch (ipstats_mib_noroutes) { |
4336 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 4337 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 4338 | if (type == IPV6_ADDR_ANY) { |
1d3fd8a1 | 4339 | IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
612f09e8 YH |
4340 | break; |
4341 | } | |
4342 | /* FALLTHROUGH */ | |
4343 | case IPSTATS_MIB_OUTNOROUTES: | |
1d3fd8a1 | 4344 | IP6_INC_STATS(net, idev, ipstats_mib_noroutes); |
612f09e8 YH |
4345 | break; |
4346 | } | |
1d3fd8a1 SS |
4347 | |
4348 | /* Start over by dropping the dst for l3mdev case */ | |
4349 | if (netif_is_l3_master(skb->dev)) | |
4350 | skb_dst_drop(skb); | |
4351 | ||
3ffe533c | 4352 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
4353 | kfree_skb(skb); |
4354 | return 0; | |
4355 | } | |
4356 | ||
9ce8ade0 TG |
4357 | static int ip6_pkt_discard(struct sk_buff *skb) |
4358 | { | |
612f09e8 | 4359 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4360 | } |
4361 | ||
ede2059d | 4362 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 4363 | { |
adf30907 | 4364 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4365 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
4366 | } |
4367 | ||
9ce8ade0 TG |
4368 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
4369 | { | |
612f09e8 | 4370 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4371 | } |
4372 | ||
ede2059d | 4373 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 4374 | { |
adf30907 | 4375 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4376 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
4377 | } |
4378 | ||
1da177e4 LT |
4379 | /* |
4380 | * Allocate a dst for local (unicast / anycast) address. | |
4381 | */ | |
4382 | ||
360a9887 DA |
4383 | struct fib6_info *addrconf_f6i_alloc(struct net *net, |
4384 | struct inet6_dev *idev, | |
4385 | const struct in6_addr *addr, | |
4386 | bool anycast, gfp_t gfp_flags) | |
1da177e4 | 4387 | { |
c7a1ce39 DA |
4388 | struct fib6_config cfg = { |
4389 | .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, | |
4390 | .fc_ifindex = idev->dev->ifindex, | |
d55a2e37 | 4391 | .fc_flags = RTF_UP | RTF_NONEXTHOP, |
c7a1ce39 DA |
4392 | .fc_dst = *addr, |
4393 | .fc_dst_len = 128, | |
4394 | .fc_protocol = RTPROT_KERNEL, | |
4395 | .fc_nlinfo.nl_net = net, | |
4396 | .fc_ignore_dev_down = true, | |
4397 | }; | |
d55a2e37 | 4398 | struct fib6_info *f6i; |
1da177e4 | 4399 | |
e8478e80 | 4400 | if (anycast) { |
c7a1ce39 DA |
4401 | cfg.fc_type = RTN_ANYCAST; |
4402 | cfg.fc_flags |= RTF_ANYCAST; | |
e8478e80 | 4403 | } else { |
c7a1ce39 DA |
4404 | cfg.fc_type = RTN_LOCAL; |
4405 | cfg.fc_flags |= RTF_LOCAL; | |
e8478e80 | 4406 | } |
1da177e4 | 4407 | |
d55a2e37 MŻ |
4408 | f6i = ip6_route_info_create(&cfg, gfp_flags, NULL); |
4409 | if (f6i) | |
4410 | f6i->dst_nocount = true; | |
4411 | return f6i; | |
1da177e4 LT |
4412 | } |
4413 | ||
c3968a85 DW |
4414 | /* remove deleted ip from prefsrc entries */ |
4415 | struct arg_dev_net_ip { | |
4416 | struct net_device *dev; | |
4417 | struct net *net; | |
4418 | struct in6_addr *addr; | |
4419 | }; | |
4420 | ||
8d1c802b | 4421 | static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) |
c3968a85 DW |
4422 | { |
4423 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
4424 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
4425 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
4426 | ||
f88d8ea6 DA |
4427 | if (!rt->nh && |
4428 | ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) && | |
421842ed | 4429 | rt != net->ipv6.fib6_null_entry && |
93c2fb25 | 4430 | ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) { |
60006a48 | 4431 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 | 4432 | /* remove prefsrc entry */ |
93c2fb25 | 4433 | rt->fib6_prefsrc.plen = 0; |
60006a48 | 4434 | spin_unlock_bh(&rt6_exception_lock); |
c3968a85 DW |
4435 | } |
4436 | return 0; | |
4437 | } | |
4438 | ||
4439 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
4440 | { | |
4441 | struct net *net = dev_net(ifp->idev->dev); | |
4442 | struct arg_dev_net_ip adni = { | |
4443 | .dev = ifp->idev->dev, | |
4444 | .net = net, | |
4445 | .addr = &ifp->addr, | |
4446 | }; | |
0c3584d5 | 4447 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
4448 | } |
4449 | ||
2b2450ca | 4450 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) |
be7a010d DJ |
4451 | |
4452 | /* Remove routers and update dst entries when gateway turn into host. */ | |
8d1c802b | 4453 | static int fib6_clean_tohost(struct fib6_info *rt, void *arg) |
be7a010d DJ |
4454 | { |
4455 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
f88d8ea6 DA |
4456 | struct fib6_nh *nh; |
4457 | ||
4458 | /* RA routes do not use nexthops */ | |
4459 | if (rt->nh) | |
4460 | return 0; | |
be7a010d | 4461 | |
f88d8ea6 | 4462 | nh = rt->fib6_nh; |
93c2fb25 | 4463 | if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
cc5c073a | 4464 | nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6)) |
be7a010d | 4465 | return -1; |
b16cb459 WW |
4466 | |
4467 | /* Further clean up cached routes in exception table. | |
4468 | * This is needed because cached route may have a different | |
4469 | * gateway than its 'parent' in the case of an ip redirect. | |
4470 | */ | |
cc5c073a | 4471 | fib6_nh_exceptions_clean_tohost(nh, gateway); |
b16cb459 | 4472 | |
be7a010d DJ |
4473 | return 0; |
4474 | } | |
4475 | ||
4476 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
4477 | { | |
4478 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
4479 | } | |
4480 | ||
2127d95a IS |
4481 | struct arg_netdev_event { |
4482 | const struct net_device *dev; | |
4c981e28 | 4483 | union { |
ecc5663c | 4484 | unsigned char nh_flags; |
4c981e28 IS |
4485 | unsigned long event; |
4486 | }; | |
2127d95a IS |
4487 | }; |
4488 | ||
8d1c802b | 4489 | static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt) |
d7dedee1 | 4490 | { |
8d1c802b | 4491 | struct fib6_info *iter; |
d7dedee1 IS |
4492 | struct fib6_node *fn; |
4493 | ||
93c2fb25 DA |
4494 | fn = rcu_dereference_protected(rt->fib6_node, |
4495 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
d7dedee1 | 4496 | iter = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 4497 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 | 4498 | while (iter) { |
93c2fb25 | 4499 | if (iter->fib6_metric == rt->fib6_metric && |
33bd5ac5 | 4500 | rt6_qualify_for_ecmp(iter)) |
d7dedee1 | 4501 | return iter; |
8fb11a9a | 4502 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 4503 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 IS |
4504 | } |
4505 | ||
4506 | return NULL; | |
4507 | } | |
4508 | ||
f88d8ea6 | 4509 | /* only called for fib entries with builtin fib6_nh */ |
8d1c802b | 4510 | static bool rt6_is_dead(const struct fib6_info *rt) |
d7dedee1 | 4511 | { |
1cf844c7 DA |
4512 | if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD || |
4513 | (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
4514 | ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev))) | |
d7dedee1 IS |
4515 | return true; |
4516 | ||
4517 | return false; | |
4518 | } | |
4519 | ||
8d1c802b | 4520 | static int rt6_multipath_total_weight(const struct fib6_info *rt) |
d7dedee1 | 4521 | { |
8d1c802b | 4522 | struct fib6_info *iter; |
d7dedee1 IS |
4523 | int total = 0; |
4524 | ||
4525 | if (!rt6_is_dead(rt)) | |
1cf844c7 | 4526 | total += rt->fib6_nh->fib_nh_weight; |
d7dedee1 | 4527 | |
93c2fb25 | 4528 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { |
d7dedee1 | 4529 | if (!rt6_is_dead(iter)) |
1cf844c7 | 4530 | total += iter->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4531 | } |
4532 | ||
4533 | return total; | |
4534 | } | |
4535 | ||
8d1c802b | 4536 | static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total) |
d7dedee1 IS |
4537 | { |
4538 | int upper_bound = -1; | |
4539 | ||
4540 | if (!rt6_is_dead(rt)) { | |
1cf844c7 | 4541 | *weight += rt->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4542 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, |
4543 | total) - 1; | |
4544 | } | |
1cf844c7 | 4545 | atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound); |
d7dedee1 IS |
4546 | } |
4547 | ||
8d1c802b | 4548 | static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total) |
d7dedee1 | 4549 | { |
8d1c802b | 4550 | struct fib6_info *iter; |
d7dedee1 IS |
4551 | int weight = 0; |
4552 | ||
4553 | rt6_upper_bound_set(rt, &weight, total); | |
4554 | ||
93c2fb25 | 4555 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
d7dedee1 IS |
4556 | rt6_upper_bound_set(iter, &weight, total); |
4557 | } | |
4558 | ||
8d1c802b | 4559 | void rt6_multipath_rebalance(struct fib6_info *rt) |
d7dedee1 | 4560 | { |
8d1c802b | 4561 | struct fib6_info *first; |
d7dedee1 IS |
4562 | int total; |
4563 | ||
4564 | /* In case the entire multipath route was marked for flushing, | |
4565 | * then there is no need to rebalance upon the removal of every | |
4566 | * sibling route. | |
4567 | */ | |
93c2fb25 | 4568 | if (!rt->fib6_nsiblings || rt->should_flush) |
d7dedee1 IS |
4569 | return; |
4570 | ||
4571 | /* During lookup routes are evaluated in order, so we need to | |
4572 | * make sure upper bounds are assigned from the first sibling | |
4573 | * onwards. | |
4574 | */ | |
4575 | first = rt6_multipath_first_sibling(rt); | |
4576 | if (WARN_ON_ONCE(!first)) | |
4577 | return; | |
4578 | ||
4579 | total = rt6_multipath_total_weight(first); | |
4580 | rt6_multipath_upper_bound_set(first, total); | |
4581 | } | |
4582 | ||
8d1c802b | 4583 | static int fib6_ifup(struct fib6_info *rt, void *p_arg) |
2127d95a IS |
4584 | { |
4585 | const struct arg_netdev_event *arg = p_arg; | |
7aef6859 | 4586 | struct net *net = dev_net(arg->dev); |
2127d95a | 4587 | |
f88d8ea6 | 4588 | if (rt != net->ipv6.fib6_null_entry && !rt->nh && |
1cf844c7 DA |
4589 | rt->fib6_nh->fib_nh_dev == arg->dev) { |
4590 | rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags; | |
7aef6859 | 4591 | fib6_update_sernum_upto_root(net, rt); |
d7dedee1 | 4592 | rt6_multipath_rebalance(rt); |
1de178ed | 4593 | } |
2127d95a IS |
4594 | |
4595 | return 0; | |
4596 | } | |
4597 | ||
ecc5663c | 4598 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags) |
2127d95a IS |
4599 | { |
4600 | struct arg_netdev_event arg = { | |
4601 | .dev = dev, | |
6802f3ad IS |
4602 | { |
4603 | .nh_flags = nh_flags, | |
4604 | }, | |
2127d95a IS |
4605 | }; |
4606 | ||
4607 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
4608 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
4609 | ||
4610 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
4611 | } | |
4612 | ||
f88d8ea6 | 4613 | /* only called for fib entries with inline fib6_nh */ |
8d1c802b | 4614 | static bool rt6_multipath_uses_dev(const struct fib6_info *rt, |
1de178ed IS |
4615 | const struct net_device *dev) |
4616 | { | |
8d1c802b | 4617 | struct fib6_info *iter; |
1de178ed | 4618 | |
1cf844c7 | 4619 | if (rt->fib6_nh->fib_nh_dev == dev) |
1de178ed | 4620 | return true; |
93c2fb25 | 4621 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 | 4622 | if (iter->fib6_nh->fib_nh_dev == dev) |
1de178ed IS |
4623 | return true; |
4624 | ||
4625 | return false; | |
4626 | } | |
4627 | ||
8d1c802b | 4628 | static void rt6_multipath_flush(struct fib6_info *rt) |
1de178ed | 4629 | { |
8d1c802b | 4630 | struct fib6_info *iter; |
1de178ed IS |
4631 | |
4632 | rt->should_flush = 1; | |
93c2fb25 | 4633 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1de178ed IS |
4634 | iter->should_flush = 1; |
4635 | } | |
4636 | ||
8d1c802b | 4637 | static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt, |
1de178ed IS |
4638 | const struct net_device *down_dev) |
4639 | { | |
8d1c802b | 4640 | struct fib6_info *iter; |
1de178ed IS |
4641 | unsigned int dead = 0; |
4642 | ||
1cf844c7 DA |
4643 | if (rt->fib6_nh->fib_nh_dev == down_dev || |
4644 | rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed | 4645 | dead++; |
93c2fb25 | 4646 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4647 | if (iter->fib6_nh->fib_nh_dev == down_dev || |
4648 | iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed IS |
4649 | dead++; |
4650 | ||
4651 | return dead; | |
4652 | } | |
4653 | ||
8d1c802b | 4654 | static void rt6_multipath_nh_flags_set(struct fib6_info *rt, |
1de178ed | 4655 | const struct net_device *dev, |
ecc5663c | 4656 | unsigned char nh_flags) |
1de178ed | 4657 | { |
8d1c802b | 4658 | struct fib6_info *iter; |
1de178ed | 4659 | |
1cf844c7 DA |
4660 | if (rt->fib6_nh->fib_nh_dev == dev) |
4661 | rt->fib6_nh->fib_nh_flags |= nh_flags; | |
93c2fb25 | 4662 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4663 | if (iter->fib6_nh->fib_nh_dev == dev) |
4664 | iter->fib6_nh->fib_nh_flags |= nh_flags; | |
1de178ed IS |
4665 | } |
4666 | ||
a1a22c12 | 4667 | /* called with write lock held for table with rt */ |
8d1c802b | 4668 | static int fib6_ifdown(struct fib6_info *rt, void *p_arg) |
1da177e4 | 4669 | { |
4c981e28 IS |
4670 | const struct arg_netdev_event *arg = p_arg; |
4671 | const struct net_device *dev = arg->dev; | |
7aef6859 | 4672 | struct net *net = dev_net(dev); |
8ed67789 | 4673 | |
f88d8ea6 | 4674 | if (rt == net->ipv6.fib6_null_entry || rt->nh) |
27c6fa73 IS |
4675 | return 0; |
4676 | ||
4677 | switch (arg->event) { | |
4678 | case NETDEV_UNREGISTER: | |
1cf844c7 | 4679 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
27c6fa73 | 4680 | case NETDEV_DOWN: |
1de178ed | 4681 | if (rt->should_flush) |
27c6fa73 | 4682 | return -1; |
93c2fb25 | 4683 | if (!rt->fib6_nsiblings) |
1cf844c7 | 4684 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
1de178ed IS |
4685 | if (rt6_multipath_uses_dev(rt, dev)) { |
4686 | unsigned int count; | |
4687 | ||
4688 | count = rt6_multipath_dead_count(rt, dev); | |
93c2fb25 | 4689 | if (rt->fib6_nsiblings + 1 == count) { |
1de178ed IS |
4690 | rt6_multipath_flush(rt); |
4691 | return -1; | |
4692 | } | |
4693 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
4694 | RTNH_F_LINKDOWN); | |
7aef6859 | 4695 | fib6_update_sernum(net, rt); |
d7dedee1 | 4696 | rt6_multipath_rebalance(rt); |
1de178ed IS |
4697 | } |
4698 | return -2; | |
27c6fa73 | 4699 | case NETDEV_CHANGE: |
1cf844c7 | 4700 | if (rt->fib6_nh->fib_nh_dev != dev || |
93c2fb25 | 4701 | rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) |
27c6fa73 | 4702 | break; |
1cf844c7 | 4703 | rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
d7dedee1 | 4704 | rt6_multipath_rebalance(rt); |
27c6fa73 | 4705 | break; |
2b241361 | 4706 | } |
c159d30c | 4707 | |
1da177e4 LT |
4708 | return 0; |
4709 | } | |
4710 | ||
27c6fa73 | 4711 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 4712 | { |
4c981e28 | 4713 | struct arg_netdev_event arg = { |
8ed67789 | 4714 | .dev = dev, |
6802f3ad IS |
4715 | { |
4716 | .event = event, | |
4717 | }, | |
8ed67789 | 4718 | }; |
7c6bb7d2 | 4719 | struct net *net = dev_net(dev); |
8ed67789 | 4720 | |
7c6bb7d2 DA |
4721 | if (net->ipv6.sysctl.skip_notify_on_dev_down) |
4722 | fib6_clean_all_skip_notify(net, fib6_ifdown, &arg); | |
4723 | else | |
4724 | fib6_clean_all(net, fib6_ifdown, &arg); | |
4c981e28 IS |
4725 | } |
4726 | ||
4727 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
4728 | { | |
4729 | rt6_sync_down_dev(dev, event); | |
4730 | rt6_uncached_list_flush_dev(dev_net(dev), dev); | |
4731 | neigh_ifdown(&nd_tbl, dev); | |
1da177e4 LT |
4732 | } |
4733 | ||
95c96174 | 4734 | struct rt6_mtu_change_arg { |
1da177e4 | 4735 | struct net_device *dev; |
95c96174 | 4736 | unsigned int mtu; |
c0b220cf | 4737 | struct fib6_info *f6i; |
1da177e4 LT |
4738 | }; |
4739 | ||
cc5c073a | 4740 | static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg) |
c0b220cf DA |
4741 | { |
4742 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg; | |
cc5c073a | 4743 | struct fib6_info *f6i = arg->f6i; |
c0b220cf DA |
4744 | |
4745 | /* For administrative MTU increase, there is no way to discover | |
4746 | * IPv6 PMTU increase, so PMTU increase should be updated here. | |
4747 | * Since RFC 1981 doesn't include administrative MTU increase | |
4748 | * update PMTU increase is a MUST. (i.e. jumbo frame) | |
4749 | */ | |
4750 | if (nh->fib_nh_dev == arg->dev) { | |
4751 | struct inet6_dev *idev = __in6_dev_get(arg->dev); | |
4752 | u32 mtu = f6i->fib6_pmtu; | |
4753 | ||
4754 | if (mtu >= arg->mtu || | |
4755 | (mtu < arg->mtu && mtu == idev->cnf.mtu6)) | |
4756 | fib6_metric_set(f6i, RTAX_MTU, arg->mtu); | |
4757 | ||
4758 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 4759 | rt6_exceptions_update_pmtu(idev, nh, arg->mtu); |
c0b220cf DA |
4760 | spin_unlock_bh(&rt6_exception_lock); |
4761 | } | |
4762 | ||
4763 | return 0; | |
4764 | } | |
4765 | ||
4766 | static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg) | |
1da177e4 LT |
4767 | { |
4768 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
4769 | struct inet6_dev *idev; | |
4770 | ||
4771 | /* In IPv6 pmtu discovery is not optional, | |
4772 | so that RTAX_MTU lock cannot disable it. | |
4773 | We still use this lock to block changes | |
4774 | caused by addrconf/ndisc. | |
4775 | */ | |
4776 | ||
4777 | idev = __in6_dev_get(arg->dev); | |
38308473 | 4778 | if (!idev) |
1da177e4 LT |
4779 | return 0; |
4780 | ||
c0b220cf DA |
4781 | if (fib6_metric_locked(f6i, RTAX_MTU)) |
4782 | return 0; | |
d4ead6b3 | 4783 | |
c0b220cf | 4784 | arg->f6i = f6i; |
2d44234b DA |
4785 | if (f6i->nh) { |
4786 | /* fib6_nh_mtu_change only returns 0, so this is safe */ | |
4787 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change, | |
4788 | arg); | |
4789 | } | |
4790 | ||
1cf844c7 | 4791 | return fib6_nh_mtu_change(f6i->fib6_nh, arg); |
1da177e4 LT |
4792 | } |
4793 | ||
95c96174 | 4794 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 4795 | { |
c71099ac TG |
4796 | struct rt6_mtu_change_arg arg = { |
4797 | .dev = dev, | |
4798 | .mtu = mtu, | |
4799 | }; | |
1da177e4 | 4800 | |
0c3584d5 | 4801 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
4802 | } |
4803 | ||
ef7c79ed | 4804 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
75425657 | 4805 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
5176f91e | 4806 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
aa8f8778 | 4807 | [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 4808 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 4809 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
4810 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
4811 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 4812 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 4813 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
4814 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
4815 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 4816 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 4817 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 4818 | [RTA_MARK] = { .type = NLA_U32 }, |
aa8f8778 | 4819 | [RTA_TABLE] = { .type = NLA_U32 }, |
eacb9384 RP |
4820 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
4821 | [RTA_SPORT] = { .type = NLA_U16 }, | |
4822 | [RTA_DPORT] = { .type = NLA_U16 }, | |
5b98324e | 4823 | [RTA_NH_ID] = { .type = NLA_U32 }, |
86872cb5 TG |
4824 | }; |
4825 | ||
4826 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
4827 | struct fib6_config *cfg, |
4828 | struct netlink_ext_ack *extack) | |
1da177e4 | 4829 | { |
86872cb5 TG |
4830 | struct rtmsg *rtm; |
4831 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 4832 | unsigned int pref; |
86872cb5 | 4833 | int err; |
1da177e4 | 4834 | |
8cb08174 JB |
4835 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
4836 | rtm_ipv6_policy, extack); | |
86872cb5 TG |
4837 | if (err < 0) |
4838 | goto errout; | |
1da177e4 | 4839 | |
86872cb5 TG |
4840 | err = -EINVAL; |
4841 | rtm = nlmsg_data(nlh); | |
86872cb5 | 4842 | |
84db8407 MŻ |
4843 | *cfg = (struct fib6_config){ |
4844 | .fc_table = rtm->rtm_table, | |
4845 | .fc_dst_len = rtm->rtm_dst_len, | |
4846 | .fc_src_len = rtm->rtm_src_len, | |
4847 | .fc_flags = RTF_UP, | |
4848 | .fc_protocol = rtm->rtm_protocol, | |
4849 | .fc_type = rtm->rtm_type, | |
4850 | ||
4851 | .fc_nlinfo.portid = NETLINK_CB(skb).portid, | |
4852 | .fc_nlinfo.nlh = nlh, | |
4853 | .fc_nlinfo.nl_net = sock_net(skb->sk), | |
4854 | }; | |
86872cb5 | 4855 | |
ef2c7d7b ND |
4856 | if (rtm->rtm_type == RTN_UNREACHABLE || |
4857 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
4858 | rtm->rtm_type == RTN_PROHIBIT || |
4859 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
4860 | cfg->fc_flags |= RTF_REJECT; |
4861 | ||
ab79ad14 MŻ |
4862 | if (rtm->rtm_type == RTN_LOCAL) |
4863 | cfg->fc_flags |= RTF_LOCAL; | |
4864 | ||
1f56a01f MKL |
4865 | if (rtm->rtm_flags & RTM_F_CLONED) |
4866 | cfg->fc_flags |= RTF_CACHE; | |
4867 | ||
fc1e64e1 DA |
4868 | cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK); |
4869 | ||
5b98324e DA |
4870 | if (tb[RTA_NH_ID]) { |
4871 | if (tb[RTA_GATEWAY] || tb[RTA_OIF] || | |
4872 | tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) { | |
4873 | NL_SET_ERR_MSG(extack, | |
4874 | "Nexthop specification and nexthop id are mutually exclusive"); | |
4875 | goto errout; | |
4876 | } | |
4877 | cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]); | |
4878 | } | |
4879 | ||
86872cb5 | 4880 | if (tb[RTA_GATEWAY]) { |
67b61f6c | 4881 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 4882 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 4883 | } |
e3818541 DA |
4884 | if (tb[RTA_VIA]) { |
4885 | NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute"); | |
4886 | goto errout; | |
4887 | } | |
86872cb5 TG |
4888 | |
4889 | if (tb[RTA_DST]) { | |
4890 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
4891 | ||
4892 | if (nla_len(tb[RTA_DST]) < plen) | |
4893 | goto errout; | |
4894 | ||
4895 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 4896 | } |
86872cb5 TG |
4897 | |
4898 | if (tb[RTA_SRC]) { | |
4899 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
4900 | ||
4901 | if (nla_len(tb[RTA_SRC]) < plen) | |
4902 | goto errout; | |
4903 | ||
4904 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 4905 | } |
86872cb5 | 4906 | |
c3968a85 | 4907 | if (tb[RTA_PREFSRC]) |
67b61f6c | 4908 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 4909 | |
86872cb5 TG |
4910 | if (tb[RTA_OIF]) |
4911 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
4912 | ||
4913 | if (tb[RTA_PRIORITY]) | |
4914 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
4915 | ||
4916 | if (tb[RTA_METRICS]) { | |
4917 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
4918 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 4919 | } |
86872cb5 TG |
4920 | |
4921 | if (tb[RTA_TABLE]) | |
4922 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
4923 | ||
51ebd318 ND |
4924 | if (tb[RTA_MULTIPATH]) { |
4925 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
4926 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
4927 | |
4928 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 4929 | cfg->fc_mp_len, extack); |
9ed59592 DA |
4930 | if (err < 0) |
4931 | goto errout; | |
51ebd318 ND |
4932 | } |
4933 | ||
c78ba6d6 LR |
4934 | if (tb[RTA_PREF]) { |
4935 | pref = nla_get_u8(tb[RTA_PREF]); | |
4936 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
4937 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
4938 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
4939 | cfg->fc_flags |= RTF_PREF(pref); | |
4940 | } | |
4941 | ||
19e42e45 RP |
4942 | if (tb[RTA_ENCAP]) |
4943 | cfg->fc_encap = tb[RTA_ENCAP]; | |
4944 | ||
9ed59592 | 4945 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
4946 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
4947 | ||
c255bd68 | 4948 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
4949 | if (err < 0) |
4950 | goto errout; | |
4951 | } | |
4952 | ||
32bc201e XL |
4953 | if (tb[RTA_EXPIRES]) { |
4954 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
4955 | ||
4956 | if (addrconf_finite_timeout(timeout)) { | |
4957 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
4958 | cfg->fc_flags |= RTF_EXPIRES; | |
4959 | } | |
4960 | } | |
4961 | ||
86872cb5 TG |
4962 | err = 0; |
4963 | errout: | |
4964 | return err; | |
1da177e4 LT |
4965 | } |
4966 | ||
6b9ea5a6 | 4967 | struct rt6_nh { |
8d1c802b | 4968 | struct fib6_info *fib6_info; |
6b9ea5a6 | 4969 | struct fib6_config r_cfg; |
6b9ea5a6 RP |
4970 | struct list_head next; |
4971 | }; | |
4972 | ||
d4ead6b3 DA |
4973 | static int ip6_route_info_append(struct net *net, |
4974 | struct list_head *rt6_nh_list, | |
8d1c802b DA |
4975 | struct fib6_info *rt, |
4976 | struct fib6_config *r_cfg) | |
6b9ea5a6 RP |
4977 | { |
4978 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
4979 | int err = -EEXIST; |
4980 | ||
4981 | list_for_each_entry(nh, rt6_nh_list, next) { | |
8d1c802b DA |
4982 | /* check if fib6_info already exists */ |
4983 | if (rt6_duplicate_nexthop(nh->fib6_info, rt)) | |
6b9ea5a6 RP |
4984 | return err; |
4985 | } | |
4986 | ||
4987 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
4988 | if (!nh) | |
4989 | return -ENOMEM; | |
8d1c802b | 4990 | nh->fib6_info = rt; |
6b9ea5a6 RP |
4991 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); |
4992 | list_add_tail(&nh->next, rt6_nh_list); | |
4993 | ||
4994 | return 0; | |
4995 | } | |
4996 | ||
8d1c802b DA |
4997 | static void ip6_route_mpath_notify(struct fib6_info *rt, |
4998 | struct fib6_info *rt_last, | |
3b1137fe DA |
4999 | struct nl_info *info, |
5000 | __u16 nlflags) | |
5001 | { | |
5002 | /* if this is an APPEND route, then rt points to the first route | |
5003 | * inserted and rt_last points to last route inserted. Userspace | |
5004 | * wants a consistent dump of the route which starts at the first | |
5005 | * nexthop. Since sibling routes are always added at the end of | |
5006 | * the list, find the first sibling of the last route appended | |
5007 | */ | |
93c2fb25 DA |
5008 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) { |
5009 | rt = list_first_entry(&rt_last->fib6_siblings, | |
8d1c802b | 5010 | struct fib6_info, |
93c2fb25 | 5011 | fib6_siblings); |
3b1137fe DA |
5012 | } |
5013 | ||
5014 | if (rt) | |
5015 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
5016 | } | |
5017 | ||
333c4301 DA |
5018 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
5019 | struct netlink_ext_ack *extack) | |
51ebd318 | 5020 | { |
8d1c802b | 5021 | struct fib6_info *rt_notif = NULL, *rt_last = NULL; |
3b1137fe | 5022 | struct nl_info *info = &cfg->fc_nlinfo; |
ebee3cad | 5023 | enum fib_event_type event_type; |
51ebd318 ND |
5024 | struct fib6_config r_cfg; |
5025 | struct rtnexthop *rtnh; | |
8d1c802b | 5026 | struct fib6_info *rt; |
6b9ea5a6 RP |
5027 | struct rt6_nh *err_nh; |
5028 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 5029 | __u16 nlflags; |
51ebd318 ND |
5030 | int remaining; |
5031 | int attrlen; | |
6b9ea5a6 RP |
5032 | int err = 1; |
5033 | int nhn = 0; | |
5034 | int replace = (cfg->fc_nlinfo.nlh && | |
5035 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
5036 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 5037 | |
3b1137fe DA |
5038 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
5039 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
5040 | nlflags |= NLM_F_APPEND; | |
5041 | ||
35f1b4e9 | 5042 | remaining = cfg->fc_mp_len; |
51ebd318 | 5043 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 5044 | |
6b9ea5a6 | 5045 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
8d1c802b | 5046 | * fib6_info structs per nexthop |
6b9ea5a6 | 5047 | */ |
51ebd318 ND |
5048 | while (rtnh_ok(rtnh, remaining)) { |
5049 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5050 | if (rtnh->rtnh_ifindex) | |
5051 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5052 | ||
5053 | attrlen = rtnh_attrlen(rtnh); | |
5054 | if (attrlen > 0) { | |
5055 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5056 | ||
5057 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5058 | if (nla) { | |
67b61f6c | 5059 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
5060 | r_cfg.fc_flags |= RTF_GATEWAY; |
5061 | } | |
19e42e45 RP |
5062 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
5063 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
5064 | if (nla) | |
5065 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 5066 | } |
6b9ea5a6 | 5067 | |
68e2ffde | 5068 | r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK); |
acb54e3c | 5069 | rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack); |
8c5b83f0 RP |
5070 | if (IS_ERR(rt)) { |
5071 | err = PTR_ERR(rt); | |
5072 | rt = NULL; | |
6b9ea5a6 | 5073 | goto cleanup; |
8c5b83f0 | 5074 | } |
b5d2d75e DA |
5075 | if (!rt6_qualify_for_ecmp(rt)) { |
5076 | err = -EINVAL; | |
5077 | NL_SET_ERR_MSG(extack, | |
5078 | "Device only routes can not be added for IPv6 using the multipath API."); | |
5079 | fib6_info_release(rt); | |
5080 | goto cleanup; | |
5081 | } | |
6b9ea5a6 | 5082 | |
1cf844c7 | 5083 | rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1; |
398958ae | 5084 | |
d4ead6b3 DA |
5085 | err = ip6_route_info_append(info->nl_net, &rt6_nh_list, |
5086 | rt, &r_cfg); | |
51ebd318 | 5087 | if (err) { |
93531c67 | 5088 | fib6_info_release(rt); |
6b9ea5a6 RP |
5089 | goto cleanup; |
5090 | } | |
5091 | ||
5092 | rtnh = rtnh_next(rtnh, &remaining); | |
5093 | } | |
5094 | ||
9eee3b49 IS |
5095 | if (list_empty(&rt6_nh_list)) { |
5096 | NL_SET_ERR_MSG(extack, | |
5097 | "Invalid nexthop configuration - no valid nexthops"); | |
5098 | return -EINVAL; | |
5099 | } | |
5100 | ||
3b1137fe DA |
5101 | /* for add and replace send one notification with all nexthops. |
5102 | * Skip the notification in fib6_add_rt2node and send one with | |
5103 | * the full route when done | |
5104 | */ | |
5105 | info->skip_notify = 1; | |
5106 | ||
ebee3cad IS |
5107 | /* For add and replace, send one notification with all nexthops. For |
5108 | * append, send one notification with all appended nexthops. | |
5109 | */ | |
5110 | info->skip_notify_kernel = 1; | |
5111 | ||
6b9ea5a6 RP |
5112 | err_nh = NULL; |
5113 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
8d1c802b DA |
5114 | err = __ip6_ins_rt(nh->fib6_info, info, extack); |
5115 | fib6_info_release(nh->fib6_info); | |
93531c67 | 5116 | |
f7225172 DA |
5117 | if (!err) { |
5118 | /* save reference to last route successfully inserted */ | |
5119 | rt_last = nh->fib6_info; | |
5120 | ||
5121 | /* save reference to first route for notification */ | |
5122 | if (!rt_notif) | |
5123 | rt_notif = nh->fib6_info; | |
5124 | } | |
3b1137fe | 5125 | |
8d1c802b DA |
5126 | /* nh->fib6_info is used or freed at this point, reset to NULL*/ |
5127 | nh->fib6_info = NULL; | |
6b9ea5a6 RP |
5128 | if (err) { |
5129 | if (replace && nhn) | |
a5a82d84 JK |
5130 | NL_SET_ERR_MSG_MOD(extack, |
5131 | "multipath route replace failed (check consistency of installed routes)"); | |
6b9ea5a6 RP |
5132 | err_nh = nh; |
5133 | goto add_errout; | |
51ebd318 | 5134 | } |
6b9ea5a6 | 5135 | |
1a72418b | 5136 | /* Because each route is added like a single route we remove |
27596472 MK |
5137 | * these flags after the first nexthop: if there is a collision, |
5138 | * we have already failed to add the first nexthop: | |
5139 | * fib6_add_rt2node() has rejected it; when replacing, old | |
5140 | * nexthops have been replaced by first new, the rest should | |
5141 | * be added to it. | |
1a72418b | 5142 | */ |
27596472 MK |
5143 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
5144 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
5145 | nhn++; |
5146 | } | |
5147 | ||
ebee3cad IS |
5148 | event_type = replace ? FIB_EVENT_ENTRY_REPLACE : FIB_EVENT_ENTRY_ADD; |
5149 | err = call_fib6_multipath_entry_notifiers(info->nl_net, event_type, | |
5150 | rt_notif, nhn - 1, extack); | |
5151 | if (err) { | |
5152 | /* Delete all the siblings that were just added */ | |
5153 | err_nh = NULL; | |
5154 | goto add_errout; | |
5155 | } | |
5156 | ||
3b1137fe DA |
5157 | /* success ... tell user about new route */ |
5158 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
5159 | goto cleanup; |
5160 | ||
5161 | add_errout: | |
3b1137fe DA |
5162 | /* send notification for routes that were added so that |
5163 | * the delete notifications sent by ip6_route_del are | |
5164 | * coherent | |
5165 | */ | |
5166 | if (rt_notif) | |
5167 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
5168 | ||
6b9ea5a6 RP |
5169 | /* Delete routes that were already added */ |
5170 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
5171 | if (err_nh == nh) | |
5172 | break; | |
333c4301 | 5173 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
5174 | } |
5175 | ||
5176 | cleanup: | |
5177 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
8d1c802b DA |
5178 | if (nh->fib6_info) |
5179 | fib6_info_release(nh->fib6_info); | |
6b9ea5a6 RP |
5180 | list_del(&nh->next); |
5181 | kfree(nh); | |
5182 | } | |
5183 | ||
5184 | return err; | |
5185 | } | |
5186 | ||
333c4301 DA |
5187 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
5188 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
5189 | { |
5190 | struct fib6_config r_cfg; | |
5191 | struct rtnexthop *rtnh; | |
5192 | int remaining; | |
5193 | int attrlen; | |
5194 | int err = 1, last_err = 0; | |
5195 | ||
5196 | remaining = cfg->fc_mp_len; | |
5197 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
5198 | ||
5199 | /* Parse a Multipath Entry */ | |
5200 | while (rtnh_ok(rtnh, remaining)) { | |
5201 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5202 | if (rtnh->rtnh_ifindex) | |
5203 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5204 | ||
5205 | attrlen = rtnh_attrlen(rtnh); | |
5206 | if (attrlen > 0) { | |
5207 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5208 | ||
5209 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5210 | if (nla) { | |
5211 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
5212 | r_cfg.fc_flags |= RTF_GATEWAY; | |
5213 | } | |
5214 | } | |
333c4301 | 5215 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
5216 | if (err) |
5217 | last_err = err; | |
5218 | ||
51ebd318 ND |
5219 | rtnh = rtnh_next(rtnh, &remaining); |
5220 | } | |
5221 | ||
5222 | return last_err; | |
5223 | } | |
5224 | ||
c21ef3e3 DA |
5225 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5226 | struct netlink_ext_ack *extack) | |
1da177e4 | 5227 | { |
86872cb5 TG |
5228 | struct fib6_config cfg; |
5229 | int err; | |
1da177e4 | 5230 | |
333c4301 | 5231 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5232 | if (err < 0) |
5233 | return err; | |
5234 | ||
5b98324e DA |
5235 | if (cfg.fc_nh_id && |
5236 | !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) { | |
5237 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
5238 | return -EINVAL; | |
5239 | } | |
5240 | ||
51ebd318 | 5241 | if (cfg.fc_mp) |
333c4301 | 5242 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
5243 | else { |
5244 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 5245 | return ip6_route_del(&cfg, extack); |
0ae81335 | 5246 | } |
1da177e4 LT |
5247 | } |
5248 | ||
c21ef3e3 DA |
5249 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5250 | struct netlink_ext_ack *extack) | |
1da177e4 | 5251 | { |
86872cb5 TG |
5252 | struct fib6_config cfg; |
5253 | int err; | |
1da177e4 | 5254 | |
333c4301 | 5255 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5256 | if (err < 0) |
5257 | return err; | |
5258 | ||
67f69513 DA |
5259 | if (cfg.fc_metric == 0) |
5260 | cfg.fc_metric = IP6_RT_PRIO_USER; | |
5261 | ||
51ebd318 | 5262 | if (cfg.fc_mp) |
333c4301 | 5263 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 5264 | else |
acb54e3c | 5265 | return ip6_route_add(&cfg, GFP_KERNEL, extack); |
1da177e4 LT |
5266 | } |
5267 | ||
a1b7a1f0 DA |
5268 | /* add the overhead of this fib6_nh to nexthop_len */ |
5269 | static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg) | |
339bf98f | 5270 | { |
a1b7a1f0 | 5271 | int *nexthop_len = arg; |
beb1afac | 5272 | |
a1b7a1f0 DA |
5273 | *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */ |
5274 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5275 | + nla_total_size(16); /* RTA_GATEWAY */ | |
5276 | ||
5277 | if (nh->fib_nh_lws) { | |
5278 | /* RTA_ENCAP_TYPE */ | |
5279 | *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5280 | /* RTA_ENCAP */ | |
5281 | *nexthop_len += nla_total_size(2); | |
5282 | } | |
f88d8ea6 | 5283 | |
a1b7a1f0 DA |
5284 | return 0; |
5285 | } | |
beb1afac | 5286 | |
a1b7a1f0 DA |
5287 | static size_t rt6_nlmsg_size(struct fib6_info *f6i) |
5288 | { | |
5289 | int nexthop_len; | |
5290 | ||
5291 | if (f6i->nh) { | |
5292 | nexthop_len = nla_total_size(4); /* RTA_NH_ID */ | |
5293 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size, | |
5294 | &nexthop_len); | |
5295 | } else { | |
5296 | struct fib6_nh *nh = f6i->fib6_nh; | |
5297 | ||
5298 | nexthop_len = 0; | |
5299 | if (f6i->fib6_nsiblings) { | |
5300 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
5301 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5302 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5303 | + lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5304 | ||
5305 | nexthop_len *= f6i->fib6_nsiblings; | |
5306 | } | |
5307 | nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
beb1afac DA |
5308 | } |
5309 | ||
339bf98f TG |
5310 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
5311 | + nla_total_size(16) /* RTA_SRC */ | |
5312 | + nla_total_size(16) /* RTA_DST */ | |
5313 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5314 | + nla_total_size(16) /* RTA_PREFSRC */ | |
5315 | + nla_total_size(4) /* RTA_TABLE */ | |
5316 | + nla_total_size(4) /* RTA_IIF */ | |
5317 | + nla_total_size(4) /* RTA_OIF */ | |
5318 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 5319 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 5320 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 5321 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 5322 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
5323 | + nexthop_len; |
5324 | } | |
5325 | ||
f88d8ea6 DA |
5326 | static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh, |
5327 | unsigned char *flags) | |
5328 | { | |
5329 | if (nexthop_is_multipath(nh)) { | |
5330 | struct nlattr *mp; | |
5331 | ||
5332 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
5333 | if (!mp) | |
5334 | goto nla_put_failure; | |
5335 | ||
5336 | if (nexthop_mpath_fill_node(skb, nh)) | |
5337 | goto nla_put_failure; | |
5338 | ||
5339 | nla_nest_end(skb, mp); | |
5340 | } else { | |
5341 | struct fib6_nh *fib6_nh; | |
5342 | ||
5343 | fib6_nh = nexthop_fib6_nh(nh); | |
5344 | if (fib_nexthop_info(skb, &fib6_nh->nh_common, | |
5345 | flags, false) < 0) | |
5346 | goto nla_put_failure; | |
5347 | } | |
5348 | ||
5349 | return 0; | |
5350 | ||
5351 | nla_put_failure: | |
5352 | return -EMSGSIZE; | |
5353 | } | |
5354 | ||
d4ead6b3 | 5355 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 5356 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 5357 | struct in6_addr *dest, struct in6_addr *src, |
15e47304 | 5358 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 5359 | unsigned int flags) |
1da177e4 | 5360 | { |
22d0bd82 XL |
5361 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
5362 | struct rt6key *rt6_dst, *rt6_src; | |
5363 | u32 *pmetrics, table, rt6_flags; | |
f88d8ea6 | 5364 | unsigned char nh_flags = 0; |
2d7202bf | 5365 | struct nlmsghdr *nlh; |
22d0bd82 | 5366 | struct rtmsg *rtm; |
d4ead6b3 | 5367 | long expires = 0; |
1da177e4 | 5368 | |
15e47304 | 5369 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 5370 | if (!nlh) |
26932566 | 5371 | return -EMSGSIZE; |
2d7202bf | 5372 | |
22d0bd82 XL |
5373 | if (rt6) { |
5374 | rt6_dst = &rt6->rt6i_dst; | |
5375 | rt6_src = &rt6->rt6i_src; | |
5376 | rt6_flags = rt6->rt6i_flags; | |
5377 | } else { | |
5378 | rt6_dst = &rt->fib6_dst; | |
5379 | rt6_src = &rt->fib6_src; | |
5380 | rt6_flags = rt->fib6_flags; | |
5381 | } | |
5382 | ||
2d7202bf | 5383 | rtm = nlmsg_data(nlh); |
1da177e4 | 5384 | rtm->rtm_family = AF_INET6; |
22d0bd82 XL |
5385 | rtm->rtm_dst_len = rt6_dst->plen; |
5386 | rtm->rtm_src_len = rt6_src->plen; | |
1da177e4 | 5387 | rtm->rtm_tos = 0; |
93c2fb25 DA |
5388 | if (rt->fib6_table) |
5389 | table = rt->fib6_table->tb6_id; | |
c71099ac | 5390 | else |
9e762a4a | 5391 | table = RT6_TABLE_UNSPEC; |
97f0082a | 5392 | rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT; |
c78679e8 DM |
5393 | if (nla_put_u32(skb, RTA_TABLE, table)) |
5394 | goto nla_put_failure; | |
e8478e80 DA |
5395 | |
5396 | rtm->rtm_type = rt->fib6_type; | |
1da177e4 LT |
5397 | rtm->rtm_flags = 0; |
5398 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
93c2fb25 | 5399 | rtm->rtm_protocol = rt->fib6_protocol; |
1da177e4 | 5400 | |
22d0bd82 | 5401 | if (rt6_flags & RTF_CACHE) |
1da177e4 LT |
5402 | rtm->rtm_flags |= RTM_F_CLONED; |
5403 | ||
d4ead6b3 DA |
5404 | if (dest) { |
5405 | if (nla_put_in6_addr(skb, RTA_DST, dest)) | |
c78679e8 | 5406 | goto nla_put_failure; |
1ab1457c | 5407 | rtm->rtm_dst_len = 128; |
1da177e4 | 5408 | } else if (rtm->rtm_dst_len) |
22d0bd82 | 5409 | if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr)) |
c78679e8 | 5410 | goto nla_put_failure; |
1da177e4 LT |
5411 | #ifdef CONFIG_IPV6_SUBTREES |
5412 | if (src) { | |
930345ea | 5413 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 5414 | goto nla_put_failure; |
1ab1457c | 5415 | rtm->rtm_src_len = 128; |
c78679e8 | 5416 | } else if (rtm->rtm_src_len && |
22d0bd82 | 5417 | nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr)) |
c78679e8 | 5418 | goto nla_put_failure; |
1da177e4 | 5419 | #endif |
7bc570c8 YH |
5420 | if (iif) { |
5421 | #ifdef CONFIG_IPV6_MROUTE | |
22d0bd82 | 5422 | if (ipv6_addr_is_multicast(&rt6_dst->addr)) { |
fd61c6ba DA |
5423 | int err = ip6mr_get_route(net, skb, rtm, portid); |
5424 | ||
5425 | if (err == 0) | |
5426 | return 0; | |
5427 | if (err < 0) | |
5428 | goto nla_put_failure; | |
7bc570c8 YH |
5429 | } else |
5430 | #endif | |
c78679e8 DM |
5431 | if (nla_put_u32(skb, RTA_IIF, iif)) |
5432 | goto nla_put_failure; | |
d4ead6b3 | 5433 | } else if (dest) { |
1da177e4 | 5434 | struct in6_addr saddr_buf; |
d4ead6b3 | 5435 | if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && |
930345ea | 5436 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5437 | goto nla_put_failure; |
1da177e4 | 5438 | } |
2d7202bf | 5439 | |
93c2fb25 | 5440 | if (rt->fib6_prefsrc.plen) { |
c3968a85 | 5441 | struct in6_addr saddr_buf; |
93c2fb25 | 5442 | saddr_buf = rt->fib6_prefsrc.addr; |
930345ea | 5443 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5444 | goto nla_put_failure; |
c3968a85 DW |
5445 | } |
5446 | ||
d4ead6b3 DA |
5447 | pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics; |
5448 | if (rtnetlink_put_metrics(skb, pmetrics) < 0) | |
2d7202bf TG |
5449 | goto nla_put_failure; |
5450 | ||
93c2fb25 | 5451 | if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric)) |
c78679e8 | 5452 | goto nla_put_failure; |
8253947e | 5453 | |
beb1afac DA |
5454 | /* For multipath routes, walk the siblings list and add |
5455 | * each as a nexthop within RTA_MULTIPATH. | |
5456 | */ | |
22d0bd82 XL |
5457 | if (rt6) { |
5458 | if (rt6_flags & RTF_GATEWAY && | |
5459 | nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway)) | |
5460 | goto nla_put_failure; | |
5461 | ||
5462 | if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex)) | |
5463 | goto nla_put_failure; | |
5464 | } else if (rt->fib6_nsiblings) { | |
8d1c802b | 5465 | struct fib6_info *sibling, *next_sibling; |
beb1afac DA |
5466 | struct nlattr *mp; |
5467 | ||
ae0be8de | 5468 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
beb1afac DA |
5469 | if (!mp) |
5470 | goto nla_put_failure; | |
5471 | ||
1cf844c7 DA |
5472 | if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common, |
5473 | rt->fib6_nh->fib_nh_weight) < 0) | |
beb1afac DA |
5474 | goto nla_put_failure; |
5475 | ||
5476 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 | 5477 | &rt->fib6_siblings, fib6_siblings) { |
1cf844c7 DA |
5478 | if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common, |
5479 | sibling->fib6_nh->fib_nh_weight) < 0) | |
beb1afac DA |
5480 | goto nla_put_failure; |
5481 | } | |
5482 | ||
5483 | nla_nest_end(skb, mp); | |
f88d8ea6 DA |
5484 | } else if (rt->nh) { |
5485 | if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id)) | |
5486 | goto nla_put_failure; | |
ecc5663c | 5487 | |
f88d8ea6 DA |
5488 | if (nexthop_is_blackhole(rt->nh)) |
5489 | rtm->rtm_type = RTN_BLACKHOLE; | |
5490 | ||
5491 | if (rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0) | |
5492 | goto nla_put_failure; | |
5493 | ||
5494 | rtm->rtm_flags |= nh_flags; | |
5495 | } else { | |
1cf844c7 | 5496 | if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, |
ecc5663c | 5497 | &nh_flags, false) < 0) |
beb1afac | 5498 | goto nla_put_failure; |
ecc5663c DA |
5499 | |
5500 | rtm->rtm_flags |= nh_flags; | |
beb1afac DA |
5501 | } |
5502 | ||
22d0bd82 | 5503 | if (rt6_flags & RTF_EXPIRES) { |
14895687 DA |
5504 | expires = dst ? dst->expires : rt->expires; |
5505 | expires -= jiffies; | |
5506 | } | |
69cdf8f9 | 5507 | |
d4ead6b3 | 5508 | if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0) |
e3703b3d | 5509 | goto nla_put_failure; |
2d7202bf | 5510 | |
22d0bd82 | 5511 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags))) |
c78ba6d6 LR |
5512 | goto nla_put_failure; |
5513 | ||
19e42e45 | 5514 | |
053c095a JB |
5515 | nlmsg_end(skb, nlh); |
5516 | return 0; | |
2d7202bf TG |
5517 | |
5518 | nla_put_failure: | |
26932566 PM |
5519 | nlmsg_cancel(skb, nlh); |
5520 | return -EMSGSIZE; | |
1da177e4 LT |
5521 | } |
5522 | ||
2c170e07 DA |
5523 | static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg) |
5524 | { | |
5525 | const struct net_device *dev = arg; | |
5526 | ||
5527 | if (nh->fib_nh_dev == dev) | |
5528 | return 1; | |
5529 | ||
5530 | return 0; | |
5531 | } | |
5532 | ||
13e38901 DA |
5533 | static bool fib6_info_uses_dev(const struct fib6_info *f6i, |
5534 | const struct net_device *dev) | |
5535 | { | |
2c170e07 DA |
5536 | if (f6i->nh) { |
5537 | struct net_device *_dev = (struct net_device *)dev; | |
5538 | ||
5539 | return !!nexthop_for_each_fib6_nh(f6i->nh, | |
5540 | fib6_info_nh_uses_dev, | |
5541 | _dev); | |
5542 | } | |
5543 | ||
1cf844c7 | 5544 | if (f6i->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5545 | return true; |
5546 | ||
5547 | if (f6i->fib6_nsiblings) { | |
5548 | struct fib6_info *sibling, *next_sibling; | |
5549 | ||
5550 | list_for_each_entry_safe(sibling, next_sibling, | |
5551 | &f6i->fib6_siblings, fib6_siblings) { | |
1cf844c7 | 5552 | if (sibling->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5553 | return true; |
5554 | } | |
5555 | } | |
5556 | ||
5557 | return false; | |
5558 | } | |
5559 | ||
1e47b483 SB |
5560 | struct fib6_nh_exception_dump_walker { |
5561 | struct rt6_rtnl_dump_arg *dump; | |
5562 | struct fib6_info *rt; | |
5563 | unsigned int flags; | |
5564 | unsigned int skip; | |
5565 | unsigned int count; | |
5566 | }; | |
5567 | ||
5568 | static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg) | |
5569 | { | |
5570 | struct fib6_nh_exception_dump_walker *w = arg; | |
5571 | struct rt6_rtnl_dump_arg *dump = w->dump; | |
5572 | struct rt6_exception_bucket *bucket; | |
5573 | struct rt6_exception *rt6_ex; | |
5574 | int i, err; | |
5575 | ||
5576 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); | |
5577 | if (!bucket) | |
5578 | return 0; | |
5579 | ||
5580 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
5581 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
5582 | if (w->skip) { | |
5583 | w->skip--; | |
5584 | continue; | |
5585 | } | |
5586 | ||
5587 | /* Expiration of entries doesn't bump sernum, insertion | |
5588 | * does. Removal is triggered by insertion, so we can | |
5589 | * rely on the fact that if entries change between two | |
5590 | * partial dumps, this node is scanned again completely, | |
5591 | * see rt6_insert_exception() and fib6_dump_table(). | |
5592 | * | |
5593 | * Count expired entries we go through as handled | |
5594 | * entries that we'll skip next time, in case of partial | |
5595 | * node dump. Otherwise, if entries expire meanwhile, | |
5596 | * we'll skip the wrong amount. | |
5597 | */ | |
5598 | if (rt6_check_expired(rt6_ex->rt6i)) { | |
5599 | w->count++; | |
5600 | continue; | |
5601 | } | |
5602 | ||
5603 | err = rt6_fill_node(dump->net, dump->skb, w->rt, | |
5604 | &rt6_ex->rt6i->dst, NULL, NULL, 0, | |
5605 | RTM_NEWROUTE, | |
5606 | NETLINK_CB(dump->cb->skb).portid, | |
5607 | dump->cb->nlh->nlmsg_seq, w->flags); | |
5608 | if (err) | |
5609 | return err; | |
5610 | ||
5611 | w->count++; | |
5612 | } | |
5613 | bucket++; | |
5614 | } | |
5615 | ||
5616 | return 0; | |
5617 | } | |
5618 | ||
bf9a8a06 | 5619 | /* Return -1 if done with node, number of handled routes on partial dump */ |
1e47b483 | 5620 | int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip) |
1da177e4 LT |
5621 | { |
5622 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
13e38901 DA |
5623 | struct fib_dump_filter *filter = &arg->filter; |
5624 | unsigned int flags = NLM_F_MULTI; | |
1f17e2f2 | 5625 | struct net *net = arg->net; |
1e47b483 | 5626 | int count = 0; |
1f17e2f2 | 5627 | |
421842ed | 5628 | if (rt == net->ipv6.fib6_null_entry) |
bf9a8a06 | 5629 | return -1; |
1da177e4 | 5630 | |
13e38901 DA |
5631 | if ((filter->flags & RTM_F_PREFIX) && |
5632 | !(rt->fib6_flags & RTF_PREFIX_RT)) { | |
5633 | /* success since this is not a prefix route */ | |
bf9a8a06 | 5634 | return -1; |
13e38901 | 5635 | } |
1e47b483 SB |
5636 | if (filter->filter_set && |
5637 | ((filter->rt_type && rt->fib6_type != filter->rt_type) || | |
5638 | (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) || | |
5639 | (filter->protocol && rt->fib6_protocol != filter->protocol))) { | |
5640 | return -1; | |
5641 | } | |
5642 | ||
5643 | if (filter->filter_set || | |
5644 | !filter->dump_routes || !filter->dump_exceptions) { | |
13e38901 | 5645 | flags |= NLM_F_DUMP_FILTERED; |
f8cfe2ce | 5646 | } |
1da177e4 | 5647 | |
1e47b483 SB |
5648 | if (filter->dump_routes) { |
5649 | if (skip) { | |
5650 | skip--; | |
5651 | } else { | |
5652 | if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, | |
5653 | 0, RTM_NEWROUTE, | |
5654 | NETLINK_CB(arg->cb->skb).portid, | |
5655 | arg->cb->nlh->nlmsg_seq, flags)) { | |
5656 | return 0; | |
5657 | } | |
5658 | count++; | |
5659 | } | |
5660 | } | |
5661 | ||
5662 | if (filter->dump_exceptions) { | |
5663 | struct fib6_nh_exception_dump_walker w = { .dump = arg, | |
5664 | .rt = rt, | |
5665 | .flags = flags, | |
5666 | .skip = skip, | |
5667 | .count = 0 }; | |
5668 | int err; | |
5669 | ||
3b525691 | 5670 | rcu_read_lock(); |
1e47b483 SB |
5671 | if (rt->nh) { |
5672 | err = nexthop_for_each_fib6_nh(rt->nh, | |
5673 | rt6_nh_dump_exceptions, | |
5674 | &w); | |
5675 | } else { | |
5676 | err = rt6_nh_dump_exceptions(rt->fib6_nh, &w); | |
5677 | } | |
3b525691 | 5678 | rcu_read_unlock(); |
1e47b483 SB |
5679 | |
5680 | if (err) | |
5681 | return count += w.count; | |
5682 | } | |
bf9a8a06 SB |
5683 | |
5684 | return -1; | |
1da177e4 LT |
5685 | } |
5686 | ||
0eff0a27 JK |
5687 | static int inet6_rtm_valid_getroute_req(struct sk_buff *skb, |
5688 | const struct nlmsghdr *nlh, | |
5689 | struct nlattr **tb, | |
5690 | struct netlink_ext_ack *extack) | |
5691 | { | |
5692 | struct rtmsg *rtm; | |
5693 | int i, err; | |
5694 | ||
5695 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
5696 | NL_SET_ERR_MSG_MOD(extack, | |
5697 | "Invalid header for get route request"); | |
5698 | return -EINVAL; | |
5699 | } | |
5700 | ||
5701 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
5702 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5703 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5704 | |
5705 | rtm = nlmsg_data(nlh); | |
5706 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || | |
5707 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || | |
5708 | rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || | |
5709 | rtm->rtm_type) { | |
5710 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
5711 | return -EINVAL; | |
5712 | } | |
5713 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
5714 | NL_SET_ERR_MSG_MOD(extack, | |
5715 | "Invalid flags for get route request"); | |
5716 | return -EINVAL; | |
5717 | } | |
5718 | ||
8cb08174 JB |
5719 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
5720 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5721 | if (err) |
5722 | return err; | |
5723 | ||
5724 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
5725 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
5726 | NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); | |
5727 | return -EINVAL; | |
5728 | } | |
5729 | ||
5730 | for (i = 0; i <= RTA_MAX; i++) { | |
5731 | if (!tb[i]) | |
5732 | continue; | |
5733 | ||
5734 | switch (i) { | |
5735 | case RTA_SRC: | |
5736 | case RTA_DST: | |
5737 | case RTA_IIF: | |
5738 | case RTA_OIF: | |
5739 | case RTA_MARK: | |
5740 | case RTA_UID: | |
5741 | case RTA_SPORT: | |
5742 | case RTA_DPORT: | |
5743 | case RTA_IP_PROTO: | |
5744 | break; | |
5745 | default: | |
5746 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
5747 | return -EINVAL; | |
5748 | } | |
5749 | } | |
5750 | ||
5751 | return 0; | |
5752 | } | |
5753 | ||
c21ef3e3 DA |
5754 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
5755 | struct netlink_ext_ack *extack) | |
1da177e4 | 5756 | { |
3b1e0a65 | 5757 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 5758 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c | 5759 | int err, iif = 0, oif = 0; |
a68886a6 | 5760 | struct fib6_info *from; |
18c3a61c | 5761 | struct dst_entry *dst; |
ab364a6f | 5762 | struct rt6_info *rt; |
1da177e4 | 5763 | struct sk_buff *skb; |
ab364a6f | 5764 | struct rtmsg *rtm; |
744486d4 | 5765 | struct flowi6 fl6 = {}; |
18c3a61c | 5766 | bool fibmatch; |
1da177e4 | 5767 | |
0eff0a27 | 5768 | err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
ab364a6f TG |
5769 | if (err < 0) |
5770 | goto errout; | |
1da177e4 | 5771 | |
ab364a6f | 5772 | err = -EINVAL; |
38b7097b HFS |
5773 | rtm = nlmsg_data(nlh); |
5774 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 5775 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 5776 | |
ab364a6f TG |
5777 | if (tb[RTA_SRC]) { |
5778 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
5779 | goto errout; | |
5780 | ||
4e3fd7a0 | 5781 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
5782 | } |
5783 | ||
5784 | if (tb[RTA_DST]) { | |
5785 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
5786 | goto errout; | |
5787 | ||
4e3fd7a0 | 5788 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
5789 | } |
5790 | ||
5791 | if (tb[RTA_IIF]) | |
5792 | iif = nla_get_u32(tb[RTA_IIF]); | |
5793 | ||
5794 | if (tb[RTA_OIF]) | |
72331bc0 | 5795 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 5796 | |
2e47b291 LC |
5797 | if (tb[RTA_MARK]) |
5798 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
5799 | ||
622ec2c9 LC |
5800 | if (tb[RTA_UID]) |
5801 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
5802 | nla_get_u32(tb[RTA_UID])); | |
5803 | else | |
5804 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
5805 | ||
eacb9384 RP |
5806 | if (tb[RTA_SPORT]) |
5807 | fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]); | |
5808 | ||
5809 | if (tb[RTA_DPORT]) | |
5810 | fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]); | |
5811 | ||
5812 | if (tb[RTA_IP_PROTO]) { | |
5813 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea HL |
5814 | &fl6.flowi6_proto, AF_INET6, |
5815 | extack); | |
eacb9384 RP |
5816 | if (err) |
5817 | goto errout; | |
5818 | } | |
5819 | ||
1da177e4 LT |
5820 | if (iif) { |
5821 | struct net_device *dev; | |
72331bc0 SL |
5822 | int flags = 0; |
5823 | ||
121622db FW |
5824 | rcu_read_lock(); |
5825 | ||
5826 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 5827 | if (!dev) { |
121622db | 5828 | rcu_read_unlock(); |
1da177e4 | 5829 | err = -ENODEV; |
ab364a6f | 5830 | goto errout; |
1da177e4 | 5831 | } |
72331bc0 SL |
5832 | |
5833 | fl6.flowi6_iif = iif; | |
5834 | ||
5835 | if (!ipv6_addr_any(&fl6.saddr)) | |
5836 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
5837 | ||
b75cc8f9 | 5838 | dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags); |
121622db FW |
5839 | |
5840 | rcu_read_unlock(); | |
72331bc0 SL |
5841 | } else { |
5842 | fl6.flowi6_oif = oif; | |
5843 | ||
58acfd71 | 5844 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
5845 | } |
5846 | ||
18c3a61c RP |
5847 | |
5848 | rt = container_of(dst, struct rt6_info, dst); | |
5849 | if (rt->dst.error) { | |
5850 | err = rt->dst.error; | |
5851 | ip6_rt_put(rt); | |
5852 | goto errout; | |
1da177e4 LT |
5853 | } |
5854 | ||
9d6acb3b WC |
5855 | if (rt == net->ipv6.ip6_null_entry) { |
5856 | err = rt->dst.error; | |
5857 | ip6_rt_put(rt); | |
5858 | goto errout; | |
5859 | } | |
5860 | ||
ab364a6f | 5861 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 5862 | if (!skb) { |
94e187c0 | 5863 | ip6_rt_put(rt); |
ab364a6f TG |
5864 | err = -ENOBUFS; |
5865 | goto errout; | |
5866 | } | |
1da177e4 | 5867 | |
d8d1f30b | 5868 | skb_dst_set(skb, &rt->dst); |
a68886a6 DA |
5869 | |
5870 | rcu_read_lock(); | |
5871 | from = rcu_dereference(rt->from); | |
886b7a50 MKL |
5872 | if (from) { |
5873 | if (fibmatch) | |
5874 | err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, | |
5875 | iif, RTM_NEWROUTE, | |
5876 | NETLINK_CB(in_skb).portid, | |
5877 | nlh->nlmsg_seq, 0); | |
5878 | else | |
5879 | err = rt6_fill_node(net, skb, from, dst, &fl6.daddr, | |
5880 | &fl6.saddr, iif, RTM_NEWROUTE, | |
5881 | NETLINK_CB(in_skb).portid, | |
5882 | nlh->nlmsg_seq, 0); | |
5883 | } else { | |
5884 | err = -ENETUNREACH; | |
5885 | } | |
a68886a6 DA |
5886 | rcu_read_unlock(); |
5887 | ||
1da177e4 | 5888 | if (err < 0) { |
ab364a6f TG |
5889 | kfree_skb(skb); |
5890 | goto errout; | |
1da177e4 LT |
5891 | } |
5892 | ||
15e47304 | 5893 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 5894 | errout: |
1da177e4 | 5895 | return err; |
1da177e4 LT |
5896 | } |
5897 | ||
8d1c802b | 5898 | void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info, |
37a1d361 | 5899 | unsigned int nlm_flags) |
1da177e4 LT |
5900 | { |
5901 | struct sk_buff *skb; | |
5578689a | 5902 | struct net *net = info->nl_net; |
528c4ceb DL |
5903 | u32 seq; |
5904 | int err; | |
5905 | ||
5906 | err = -ENOBUFS; | |
38308473 | 5907 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 5908 | |
19e42e45 | 5909 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 5910 | if (!skb) |
21713ebc TG |
5911 | goto errout; |
5912 | ||
d4ead6b3 DA |
5913 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, |
5914 | event, info->portid, seq, nlm_flags); | |
26932566 PM |
5915 | if (err < 0) { |
5916 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
5917 | WARN_ON(err == -EMSGSIZE); | |
5918 | kfree_skb(skb); | |
5919 | goto errout; | |
5920 | } | |
15e47304 | 5921 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
5922 | info->nlh, gfp_any()); |
5923 | return; | |
21713ebc TG |
5924 | errout: |
5925 | if (err < 0) | |
5578689a | 5926 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
5927 | } |
5928 | ||
19a3b7ee DA |
5929 | void fib6_rt_update(struct net *net, struct fib6_info *rt, |
5930 | struct nl_info *info) | |
5931 | { | |
5932 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
5933 | struct sk_buff *skb; | |
5934 | int err = -ENOBUFS; | |
5935 | ||
5936 | /* call_fib6_entry_notifiers will be removed when in-kernel notifier | |
5937 | * is implemented and supported for nexthop objects | |
5938 | */ | |
5939 | call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL); | |
5940 | ||
5941 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
5942 | if (!skb) | |
5943 | goto errout; | |
5944 | ||
5945 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, | |
5946 | RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE); | |
5947 | if (err < 0) { | |
5948 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
5949 | WARN_ON(err == -EMSGSIZE); | |
5950 | kfree_skb(skb); | |
5951 | goto errout; | |
5952 | } | |
5953 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, | |
5954 | info->nlh, gfp_any()); | |
5955 | return; | |
5956 | errout: | |
5957 | if (err < 0) | |
5958 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
5959 | } | |
5960 | ||
8ed67789 | 5961 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 5962 | unsigned long event, void *ptr) |
8ed67789 | 5963 | { |
351638e7 | 5964 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 5965 | struct net *net = dev_net(dev); |
8ed67789 | 5966 | |
242d3a49 WC |
5967 | if (!(dev->flags & IFF_LOOPBACK)) |
5968 | return NOTIFY_OK; | |
5969 | ||
5970 | if (event == NETDEV_REGISTER) { | |
1cf844c7 | 5971 | net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev; |
d8d1f30b | 5972 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
5973 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
5974 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 5975 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 5976 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 5977 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 5978 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 5979 | #endif |
76da0704 WC |
5980 | } else if (event == NETDEV_UNREGISTER && |
5981 | dev->reg_state != NETREG_UNREGISTERED) { | |
5982 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
5983 | * netdev_wait_allrefs(). Make sure we only call this once. | |
5984 | */ | |
12d94a80 | 5985 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 5986 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
5987 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
5988 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
5989 | #endif |
5990 | } | |
5991 | ||
5992 | return NOTIFY_OK; | |
5993 | } | |
5994 | ||
1da177e4 LT |
5995 | /* |
5996 | * /proc | |
5997 | */ | |
5998 | ||
5999 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
6000 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
6001 | { | |
69ddb805 | 6002 | struct net *net = (struct net *)seq->private; |
1da177e4 | 6003 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
6004 | net->ipv6.rt6_stats->fib_nodes, |
6005 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 6006 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
6007 | net->ipv6.rt6_stats->fib_rt_entries, |
6008 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 6009 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 6010 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
6011 | |
6012 | return 0; | |
6013 | } | |
1da177e4 LT |
6014 | #endif /* CONFIG_PROC_FS */ |
6015 | ||
6016 | #ifdef CONFIG_SYSCTL | |
6017 | ||
1da177e4 | 6018 | static |
fe2c6338 | 6019 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
6020 | void __user *buffer, size_t *lenp, loff_t *ppos) |
6021 | { | |
c486da34 LAG |
6022 | struct net *net; |
6023 | int delay; | |
f0fb9b28 | 6024 | int ret; |
c486da34 | 6025 | if (!write) |
1da177e4 | 6026 | return -EINVAL; |
c486da34 LAG |
6027 | |
6028 | net = (struct net *)ctl->extra1; | |
6029 | delay = net->ipv6.sysctl.flush_delay; | |
f0fb9b28 AP |
6030 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
6031 | if (ret) | |
6032 | return ret; | |
6033 | ||
2ac3ac8f | 6034 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 6035 | return 0; |
1da177e4 LT |
6036 | } |
6037 | ||
ed792e28 | 6038 | static struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 6039 | { |
1da177e4 | 6040 | .procname = "flush", |
4990509f | 6041 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 6042 | .maxlen = sizeof(int), |
89c8b3a1 | 6043 | .mode = 0200, |
6d9f239a | 6044 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
6045 | }, |
6046 | { | |
1da177e4 | 6047 | .procname = "gc_thresh", |
9a7ec3a9 | 6048 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
6049 | .maxlen = sizeof(int), |
6050 | .mode = 0644, | |
6d9f239a | 6051 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6052 | }, |
6053 | { | |
1da177e4 | 6054 | .procname = "max_size", |
4990509f | 6055 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
6056 | .maxlen = sizeof(int), |
6057 | .mode = 0644, | |
6d9f239a | 6058 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6059 | }, |
6060 | { | |
1da177e4 | 6061 | .procname = "gc_min_interval", |
4990509f | 6062 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6063 | .maxlen = sizeof(int), |
6064 | .mode = 0644, | |
6d9f239a | 6065 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6066 | }, |
6067 | { | |
1da177e4 | 6068 | .procname = "gc_timeout", |
4990509f | 6069 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
6070 | .maxlen = sizeof(int), |
6071 | .mode = 0644, | |
6d9f239a | 6072 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6073 | }, |
6074 | { | |
1da177e4 | 6075 | .procname = "gc_interval", |
4990509f | 6076 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
6077 | .maxlen = sizeof(int), |
6078 | .mode = 0644, | |
6d9f239a | 6079 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6080 | }, |
6081 | { | |
1da177e4 | 6082 | .procname = "gc_elasticity", |
4990509f | 6083 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
6084 | .maxlen = sizeof(int), |
6085 | .mode = 0644, | |
f3d3f616 | 6086 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6087 | }, |
6088 | { | |
1da177e4 | 6089 | .procname = "mtu_expires", |
4990509f | 6090 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
6091 | .maxlen = sizeof(int), |
6092 | .mode = 0644, | |
6d9f239a | 6093 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6094 | }, |
6095 | { | |
1da177e4 | 6096 | .procname = "min_adv_mss", |
4990509f | 6097 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
6098 | .maxlen = sizeof(int), |
6099 | .mode = 0644, | |
f3d3f616 | 6100 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6101 | }, |
6102 | { | |
1da177e4 | 6103 | .procname = "gc_min_interval_ms", |
4990509f | 6104 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6105 | .maxlen = sizeof(int), |
6106 | .mode = 0644, | |
6d9f239a | 6107 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 6108 | }, |
7c6bb7d2 DA |
6109 | { |
6110 | .procname = "skip_notify_on_dev_down", | |
6111 | .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down, | |
6112 | .maxlen = sizeof(int), | |
6113 | .mode = 0644, | |
b8e8a863 | 6114 | .proc_handler = proc_dointvec_minmax, |
eec4844f MC |
6115 | .extra1 = SYSCTL_ZERO, |
6116 | .extra2 = SYSCTL_ONE, | |
7c6bb7d2 | 6117 | }, |
f8572d8f | 6118 | { } |
1da177e4 LT |
6119 | }; |
6120 | ||
2c8c1e72 | 6121 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
6122 | { |
6123 | struct ctl_table *table; | |
6124 | ||
6125 | table = kmemdup(ipv6_route_table_template, | |
6126 | sizeof(ipv6_route_table_template), | |
6127 | GFP_KERNEL); | |
5ee09105 YH |
6128 | |
6129 | if (table) { | |
6130 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 6131 | table[0].extra1 = net; |
86393e52 | 6132 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
6133 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
6134 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
6135 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
6136 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
6137 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
6138 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
6139 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 6140 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7c6bb7d2 | 6141 | table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down; |
464dc801 EB |
6142 | |
6143 | /* Don't export sysctls to unprivileged users */ | |
6144 | if (net->user_ns != &init_user_ns) | |
6145 | table[0].procname = NULL; | |
5ee09105 YH |
6146 | } |
6147 | ||
760f2d01 DL |
6148 | return table; |
6149 | } | |
1da177e4 LT |
6150 | #endif |
6151 | ||
2c8c1e72 | 6152 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 6153 | { |
633d424b | 6154 | int ret = -ENOMEM; |
8ed67789 | 6155 | |
86393e52 AD |
6156 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
6157 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 6158 | |
fc66f95c ED |
6159 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
6160 | goto out_ip6_dst_ops; | |
6161 | ||
1cf844c7 | 6162 | net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true); |
421842ed DA |
6163 | if (!net->ipv6.fib6_null_entry) |
6164 | goto out_ip6_dst_entries; | |
1cf844c7 DA |
6165 | memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template, |
6166 | sizeof(*net->ipv6.fib6_null_entry)); | |
421842ed | 6167 | |
8ed67789 DL |
6168 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
6169 | sizeof(*net->ipv6.ip6_null_entry), | |
6170 | GFP_KERNEL); | |
6171 | if (!net->ipv6.ip6_null_entry) | |
421842ed | 6172 | goto out_fib6_null_entry; |
d8d1f30b | 6173 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6174 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
6175 | ip6_template_metrics, true); | |
74109218 | 6176 | INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached); |
8ed67789 DL |
6177 | |
6178 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 6179 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
6180 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
6181 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
6182 | GFP_KERNEL); | |
68fffc67 PZ |
6183 | if (!net->ipv6.ip6_prohibit_entry) |
6184 | goto out_ip6_null_entry; | |
d8d1f30b | 6185 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6186 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
6187 | ip6_template_metrics, true); | |
74109218 | 6188 | INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached); |
8ed67789 DL |
6189 | |
6190 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
6191 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
6192 | GFP_KERNEL); | |
68fffc67 PZ |
6193 | if (!net->ipv6.ip6_blk_hole_entry) |
6194 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 6195 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6196 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
6197 | ip6_template_metrics, true); | |
74109218 | 6198 | INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached); |
8ed67789 DL |
6199 | #endif |
6200 | ||
b339a47c PZ |
6201 | net->ipv6.sysctl.flush_delay = 0; |
6202 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
6203 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
6204 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
6205 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
6206 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
6207 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
6208 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
7c6bb7d2 | 6209 | net->ipv6.sysctl.skip_notify_on_dev_down = 0; |
b339a47c | 6210 | |
6891a346 BT |
6211 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
6212 | ||
8ed67789 DL |
6213 | ret = 0; |
6214 | out: | |
6215 | return ret; | |
f2fc6a54 | 6216 | |
68fffc67 PZ |
6217 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
6218 | out_ip6_prohibit_entry: | |
6219 | kfree(net->ipv6.ip6_prohibit_entry); | |
6220 | out_ip6_null_entry: | |
6221 | kfree(net->ipv6.ip6_null_entry); | |
6222 | #endif | |
421842ed DA |
6223 | out_fib6_null_entry: |
6224 | kfree(net->ipv6.fib6_null_entry); | |
fc66f95c ED |
6225 | out_ip6_dst_entries: |
6226 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 6227 | out_ip6_dst_ops: |
f2fc6a54 | 6228 | goto out; |
cdb18761 DL |
6229 | } |
6230 | ||
2c8c1e72 | 6231 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 6232 | { |
421842ed | 6233 | kfree(net->ipv6.fib6_null_entry); |
8ed67789 DL |
6234 | kfree(net->ipv6.ip6_null_entry); |
6235 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6236 | kfree(net->ipv6.ip6_prohibit_entry); | |
6237 | kfree(net->ipv6.ip6_blk_hole_entry); | |
6238 | #endif | |
41bb78b4 | 6239 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
6240 | } |
6241 | ||
d189634e TG |
6242 | static int __net_init ip6_route_net_init_late(struct net *net) |
6243 | { | |
6244 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
6245 | proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops, |
6246 | sizeof(struct ipv6_route_iter)); | |
3617d949 CH |
6247 | proc_create_net_single("rt6_stats", 0444, net->proc_net, |
6248 | rt6_stats_seq_show, NULL); | |
d189634e TG |
6249 | #endif |
6250 | return 0; | |
6251 | } | |
6252 | ||
6253 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
6254 | { | |
6255 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
6256 | remove_proc_entry("ipv6_route", net->proc_net); |
6257 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
6258 | #endif |
6259 | } | |
6260 | ||
cdb18761 DL |
6261 | static struct pernet_operations ip6_route_net_ops = { |
6262 | .init = ip6_route_net_init, | |
6263 | .exit = ip6_route_net_exit, | |
6264 | }; | |
6265 | ||
c3426b47 DM |
6266 | static int __net_init ipv6_inetpeer_init(struct net *net) |
6267 | { | |
6268 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
6269 | ||
6270 | if (!bp) | |
6271 | return -ENOMEM; | |
6272 | inet_peer_base_init(bp); | |
6273 | net->ipv6.peers = bp; | |
6274 | return 0; | |
6275 | } | |
6276 | ||
6277 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
6278 | { | |
6279 | struct inet_peer_base *bp = net->ipv6.peers; | |
6280 | ||
6281 | net->ipv6.peers = NULL; | |
56a6b248 | 6282 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
6283 | kfree(bp); |
6284 | } | |
6285 | ||
2b823f72 | 6286 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
6287 | .init = ipv6_inetpeer_init, |
6288 | .exit = ipv6_inetpeer_exit, | |
6289 | }; | |
6290 | ||
d189634e TG |
6291 | static struct pernet_operations ip6_route_net_late_ops = { |
6292 | .init = ip6_route_net_init_late, | |
6293 | .exit = ip6_route_net_exit_late, | |
6294 | }; | |
6295 | ||
8ed67789 DL |
6296 | static struct notifier_block ip6_route_dev_notifier = { |
6297 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 6298 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
6299 | }; |
6300 | ||
2f460933 WC |
6301 | void __init ip6_route_init_special_entries(void) |
6302 | { | |
6303 | /* Registering of the loopback is done before this portion of code, | |
6304 | * the loopback reference in rt6_info will not be taken, do it | |
6305 | * manually for init_net */ | |
1cf844c7 | 6306 | init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev; |
2f460933 WC |
6307 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
6308 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6309 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6310 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
6311 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6312 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
6313 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6314 | #endif | |
6315 | } | |
6316 | ||
433d49c3 | 6317 | int __init ip6_route_init(void) |
1da177e4 | 6318 | { |
433d49c3 | 6319 | int ret; |
8d0b94af | 6320 | int cpu; |
433d49c3 | 6321 | |
9a7ec3a9 DL |
6322 | ret = -ENOMEM; |
6323 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 6324 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 6325 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 6326 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 6327 | goto out; |
14e50e57 | 6328 | |
fc66f95c | 6329 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 6330 | if (ret) |
bdb3289f | 6331 | goto out_kmem_cache; |
bdb3289f | 6332 | |
c3426b47 DM |
6333 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
6334 | if (ret) | |
e8803b6c | 6335 | goto out_dst_entries; |
2a0c451a | 6336 | |
7e52b33b DM |
6337 | ret = register_pernet_subsys(&ip6_route_net_ops); |
6338 | if (ret) | |
6339 | goto out_register_inetpeer; | |
c3426b47 | 6340 | |
5dc121e9 AE |
6341 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
6342 | ||
e8803b6c | 6343 | ret = fib6_init(); |
433d49c3 | 6344 | if (ret) |
8ed67789 | 6345 | goto out_register_subsys; |
433d49c3 | 6346 | |
433d49c3 DL |
6347 | ret = xfrm6_init(); |
6348 | if (ret) | |
e8803b6c | 6349 | goto out_fib6_init; |
c35b7e72 | 6350 | |
433d49c3 DL |
6351 | ret = fib6_rules_init(); |
6352 | if (ret) | |
6353 | goto xfrm6_init; | |
7e5449c2 | 6354 | |
d189634e TG |
6355 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
6356 | if (ret) | |
6357 | goto fib6_rules_init; | |
6358 | ||
16feebcf FW |
6359 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
6360 | inet6_rtm_newroute, NULL, 0); | |
6361 | if (ret < 0) | |
6362 | goto out_register_late_subsys; | |
6363 | ||
6364 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
6365 | inet6_rtm_delroute, NULL, 0); | |
6366 | if (ret < 0) | |
6367 | goto out_register_late_subsys; | |
6368 | ||
6369 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
6370 | inet6_rtm_getroute, NULL, | |
6371 | RTNL_FLAG_DOIT_UNLOCKED); | |
6372 | if (ret < 0) | |
d189634e | 6373 | goto out_register_late_subsys; |
c127ea2c | 6374 | |
8ed67789 | 6375 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 6376 | if (ret) |
d189634e | 6377 | goto out_register_late_subsys; |
8ed67789 | 6378 | |
8d0b94af MKL |
6379 | for_each_possible_cpu(cpu) { |
6380 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
6381 | ||
6382 | INIT_LIST_HEAD(&ul->head); | |
6383 | spin_lock_init(&ul->lock); | |
6384 | } | |
6385 | ||
433d49c3 DL |
6386 | out: |
6387 | return ret; | |
6388 | ||
d189634e | 6389 | out_register_late_subsys: |
16feebcf | 6390 | rtnl_unregister_all(PF_INET6); |
d189634e | 6391 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 6392 | fib6_rules_init: |
433d49c3 DL |
6393 | fib6_rules_cleanup(); |
6394 | xfrm6_init: | |
433d49c3 | 6395 | xfrm6_fini(); |
2a0c451a TG |
6396 | out_fib6_init: |
6397 | fib6_gc_cleanup(); | |
8ed67789 DL |
6398 | out_register_subsys: |
6399 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
6400 | out_register_inetpeer: |
6401 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
6402 | out_dst_entries: |
6403 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 6404 | out_kmem_cache: |
f2fc6a54 | 6405 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 6406 | goto out; |
1da177e4 LT |
6407 | } |
6408 | ||
6409 | void ip6_route_cleanup(void) | |
6410 | { | |
8ed67789 | 6411 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 6412 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 6413 | fib6_rules_cleanup(); |
1da177e4 | 6414 | xfrm6_fini(); |
1da177e4 | 6415 | fib6_gc_cleanup(); |
c3426b47 | 6416 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 6417 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 6418 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 6419 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 6420 | } |