Commit | Line | Data |
---|---|---|
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); | |
8d1c802b | 103 | static size_t rt6_nlmsg_size(struct fib6_info *rt); |
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) { |
8d0b94af MKL |
179 | rt->dst.dev = loopback_dev; |
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 | ||
221 | return ip6_neigh_lookup(&rt->rt6i_gateway, dst->dev, skb, daddr); | |
f83c7790 DM |
222 | } |
223 | ||
63fca65d JA |
224 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
225 | { | |
226 | struct net_device *dev = dst->dev; | |
227 | struct rt6_info *rt = (struct rt6_info *)dst; | |
228 | ||
f8a1b43b | 229 | daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr); |
63fca65d JA |
230 | if (!daddr) |
231 | return; | |
232 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
233 | return; | |
234 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
235 | return; | |
236 | __ipv6_confirm_neigh(dev, daddr); | |
237 | } | |
238 | ||
9a7ec3a9 | 239 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 240 | .family = AF_INET6, |
1da177e4 LT |
241 | .gc = ip6_dst_gc, |
242 | .gc_thresh = 1024, | |
243 | .check = ip6_dst_check, | |
0dbaee3b | 244 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 245 | .mtu = ip6_mtu, |
d4ead6b3 | 246 | .cow_metrics = dst_cow_metrics_generic, |
1da177e4 LT |
247 | .destroy = ip6_dst_destroy, |
248 | .ifdown = ip6_dst_ifdown, | |
249 | .negative_advice = ip6_negative_advice, | |
250 | .link_failure = ip6_link_failure, | |
251 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 252 | .redirect = rt6_do_redirect, |
9f8955cc | 253 | .local_out = __ip6_local_out, |
f8a1b43b | 254 | .neigh_lookup = ip6_dst_neigh_lookup, |
63fca65d | 255 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
256 | }; |
257 | ||
ebb762f2 | 258 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 259 | { |
618f9bc7 SK |
260 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
261 | ||
262 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
263 | } |
264 | ||
6700c270 DM |
265 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
266 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
267 | { |
268 | } | |
269 | ||
6700c270 DM |
270 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
271 | struct sk_buff *skb) | |
b587ee3b DM |
272 | { |
273 | } | |
274 | ||
14e50e57 DM |
275 | static struct dst_ops ip6_dst_blackhole_ops = { |
276 | .family = AF_INET6, | |
14e50e57 DM |
277 | .destroy = ip6_dst_destroy, |
278 | .check = ip6_dst_check, | |
ebb762f2 | 279 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 280 | .default_advmss = ip6_default_advmss, |
14e50e57 | 281 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 282 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 283 | .cow_metrics = dst_cow_metrics_generic, |
f8a1b43b | 284 | .neigh_lookup = ip6_dst_neigh_lookup, |
14e50e57 DM |
285 | }; |
286 | ||
62fa8a84 | 287 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 288 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
289 | }; |
290 | ||
8d1c802b | 291 | static const struct fib6_info fib6_null_entry_template = { |
93c2fb25 DA |
292 | .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP), |
293 | .fib6_protocol = RTPROT_KERNEL, | |
294 | .fib6_metric = ~(u32)0, | |
f05713e0 | 295 | .fib6_ref = REFCOUNT_INIT(1), |
421842ed DA |
296 | .fib6_type = RTN_UNREACHABLE, |
297 | .fib6_metrics = (struct dst_metrics *)&dst_default_metrics, | |
298 | }; | |
299 | ||
fb0af4c7 | 300 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
301 | .dst = { |
302 | .__refcnt = ATOMIC_INIT(1), | |
303 | .__use = 1, | |
2c20cbd7 | 304 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 305 | .error = -ENETUNREACH, |
d8d1f30b CG |
306 | .input = ip6_pkt_discard, |
307 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
308 | }, |
309 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
1da177e4 LT |
310 | }; |
311 | ||
101367c2 TG |
312 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
313 | ||
fb0af4c7 | 314 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
315 | .dst = { |
316 | .__refcnt = ATOMIC_INIT(1), | |
317 | .__use = 1, | |
2c20cbd7 | 318 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 319 | .error = -EACCES, |
d8d1f30b CG |
320 | .input = ip6_pkt_prohibit, |
321 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
322 | }, |
323 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
324 | }; |
325 | ||
fb0af4c7 | 326 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
327 | .dst = { |
328 | .__refcnt = ATOMIC_INIT(1), | |
329 | .__use = 1, | |
2c20cbd7 | 330 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 331 | .error = -EINVAL, |
d8d1f30b | 332 | .input = dst_discard, |
ede2059d | 333 | .output = dst_discard_out, |
101367c2 TG |
334 | }, |
335 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
336 | }; |
337 | ||
338 | #endif | |
339 | ||
ebfa45f0 MKL |
340 | static void rt6_info_init(struct rt6_info *rt) |
341 | { | |
342 | struct dst_entry *dst = &rt->dst; | |
343 | ||
344 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
ebfa45f0 MKL |
345 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
346 | } | |
347 | ||
1da177e4 | 348 | /* allocate dst with ip6_dst_ops */ |
93531c67 DA |
349 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
350 | int flags) | |
1da177e4 | 351 | { |
97bab73f | 352 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
b2a9c0ed | 353 | 1, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 354 | |
81eb8447 | 355 | if (rt) { |
ebfa45f0 | 356 | rt6_info_init(rt); |
81eb8447 WW |
357 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
358 | } | |
8104891b | 359 | |
cf911662 | 360 | return rt; |
1da177e4 | 361 | } |
9ab179d8 | 362 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 363 | |
1da177e4 LT |
364 | static void ip6_dst_destroy(struct dst_entry *dst) |
365 | { | |
366 | struct rt6_info *rt = (struct rt6_info *)dst; | |
a68886a6 | 367 | struct fib6_info *from; |
8d0b94af | 368 | struct inet6_dev *idev; |
1da177e4 | 369 | |
1620a336 | 370 | ip_dst_metrics_put(dst); |
8d0b94af MKL |
371 | rt6_uncached_list_del(rt); |
372 | ||
373 | idev = rt->rt6i_idev; | |
38308473 | 374 | if (idev) { |
1da177e4 LT |
375 | rt->rt6i_idev = NULL; |
376 | in6_dev_put(idev); | |
1ab1457c | 377 | } |
1716a961 | 378 | |
0e233874 | 379 | from = xchg((__force struct fib6_info **)&rt->from, NULL); |
93531c67 | 380 | fib6_info_release(from); |
b3419363 DM |
381 | } |
382 | ||
1da177e4 LT |
383 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
384 | int how) | |
385 | { | |
386 | struct rt6_info *rt = (struct rt6_info *)dst; | |
387 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 388 | struct net_device *loopback_dev = |
c346dca1 | 389 | dev_net(dev)->loopback_dev; |
1da177e4 | 390 | |
e5645f51 WW |
391 | if (idev && idev->dev != loopback_dev) { |
392 | struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); | |
393 | if (loopback_idev) { | |
394 | rt->rt6i_idev = loopback_idev; | |
395 | in6_dev_put(idev); | |
97cac082 | 396 | } |
1da177e4 LT |
397 | } |
398 | } | |
399 | ||
5973fb1e MKL |
400 | static bool __rt6_check_expired(const struct rt6_info *rt) |
401 | { | |
402 | if (rt->rt6i_flags & RTF_EXPIRES) | |
403 | return time_after(jiffies, rt->dst.expires); | |
404 | else | |
405 | return false; | |
406 | } | |
407 | ||
a50feda5 | 408 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 409 | { |
a68886a6 DA |
410 | struct fib6_info *from; |
411 | ||
412 | from = rcu_dereference(rt->from); | |
413 | ||
1716a961 G |
414 | if (rt->rt6i_flags & RTF_EXPIRES) { |
415 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 416 | return true; |
a68886a6 | 417 | } else if (from) { |
1e2ea8ad | 418 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
a68886a6 | 419 | fib6_check_expired(from); |
1716a961 | 420 | } |
a50feda5 | 421 | return false; |
1da177e4 LT |
422 | } |
423 | ||
b1d40991 DA |
424 | void fib6_select_path(const struct net *net, struct fib6_result *res, |
425 | struct flowi6 *fl6, int oif, bool have_oif_match, | |
426 | const struct sk_buff *skb, int strict) | |
51ebd318 | 427 | { |
8d1c802b | 428 | struct fib6_info *sibling, *next_sibling; |
b1d40991 DA |
429 | struct fib6_info *match = res->f6i; |
430 | ||
f88d8ea6 | 431 | if ((!match->fib6_nsiblings && !match->nh) || have_oif_match) |
b1d40991 | 432 | goto out; |
51ebd318 | 433 | |
b673d6cc JS |
434 | /* We might have already computed the hash for ICMPv6 errors. In such |
435 | * case it will always be non-zero. Otherwise now is the time to do it. | |
436 | */ | |
f88d8ea6 DA |
437 | if (!fl6->mp_hash && |
438 | (!match->nh || nexthop_is_multipath(match->nh))) | |
b4bac172 | 439 | fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL); |
b673d6cc | 440 | |
f88d8ea6 DA |
441 | if (unlikely(match->nh)) { |
442 | nexthop_path_fib6_result(res, fl6->mp_hash); | |
443 | return; | |
444 | } | |
445 | ||
1cf844c7 | 446 | if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound)) |
b1d40991 | 447 | goto out; |
3d709f69 | 448 | |
93c2fb25 DA |
449 | list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings, |
450 | fib6_siblings) { | |
1cf844c7 | 451 | const struct fib6_nh *nh = sibling->fib6_nh; |
5e670d84 DA |
452 | int nh_upper_bound; |
453 | ||
702cea56 | 454 | nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound); |
5e670d84 | 455 | if (fl6->mp_hash > nh_upper_bound) |
3d709f69 | 456 | continue; |
702cea56 | 457 | if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0) |
3d709f69 IS |
458 | break; |
459 | match = sibling; | |
460 | break; | |
461 | } | |
462 | ||
b1d40991 DA |
463 | out: |
464 | res->f6i = match; | |
1cf844c7 | 465 | res->nh = match->fib6_nh; |
51ebd318 ND |
466 | } |
467 | ||
1da177e4 | 468 | /* |
66f5d6ce | 469 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
470 | */ |
471 | ||
0c59d006 DA |
472 | static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh, |
473 | const struct in6_addr *saddr, int oif, int flags) | |
474 | { | |
475 | const struct net_device *dev; | |
476 | ||
477 | if (nh->fib_nh_flags & RTNH_F_DEAD) | |
478 | return false; | |
479 | ||
480 | dev = nh->fib_nh_dev; | |
481 | if (oif) { | |
482 | if (dev->ifindex == oif) | |
483 | return true; | |
484 | } else { | |
485 | if (ipv6_chk_addr(net, saddr, dev, | |
486 | flags & RT6_LOOKUP_F_IFACE)) | |
487 | return true; | |
488 | } | |
489 | ||
490 | return false; | |
491 | } | |
492 | ||
75ef7389 DA |
493 | static void rt6_device_match(struct net *net, struct fib6_result *res, |
494 | const struct in6_addr *saddr, int oif, int flags) | |
1da177e4 | 495 | { |
75ef7389 DA |
496 | struct fib6_info *f6i = res->f6i; |
497 | struct fib6_info *spf6i; | |
498 | struct fib6_nh *nh; | |
1da177e4 | 499 | |
75ef7389 | 500 | if (!oif && ipv6_addr_any(saddr)) { |
f88d8ea6 DA |
501 | if (unlikely(f6i->nh)) { |
502 | nh = nexthop_fib6_nh(f6i->nh); | |
503 | if (nexthop_is_blackhole(f6i->nh)) | |
504 | goto out_blackhole; | |
505 | } else { | |
506 | nh = f6i->fib6_nh; | |
507 | } | |
7d21fec9 DA |
508 | if (!(nh->fib_nh_flags & RTNH_F_DEAD)) |
509 | goto out; | |
75ef7389 | 510 | } |
dd3abc4e | 511 | |
75ef7389 | 512 | for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) { |
1cf844c7 | 513 | nh = spf6i->fib6_nh; |
75ef7389 DA |
514 | if (__rt6_device_match(net, nh, saddr, oif, flags)) { |
515 | res->f6i = spf6i; | |
7d21fec9 | 516 | goto out; |
75ef7389 | 517 | } |
dd3abc4e | 518 | } |
1da177e4 | 519 | |
75ef7389 DA |
520 | if (oif && flags & RT6_LOOKUP_F_IFACE) { |
521 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 522 | nh = res->f6i->fib6_nh; |
7d21fec9 | 523 | goto out; |
75ef7389 | 524 | } |
8067bb8c | 525 | |
f88d8ea6 DA |
526 | if (unlikely(f6i->nh)) { |
527 | nh = nexthop_fib6_nh(f6i->nh); | |
528 | if (nexthop_is_blackhole(f6i->nh)) | |
529 | goto out_blackhole; | |
530 | } else { | |
531 | nh = f6i->fib6_nh; | |
532 | } | |
533 | ||
7d21fec9 | 534 | if (nh->fib_nh_flags & RTNH_F_DEAD) { |
75ef7389 | 535 | res->f6i = net->ipv6.fib6_null_entry; |
1cf844c7 | 536 | nh = res->f6i->fib6_nh; |
75ef7389 | 537 | } |
7d21fec9 DA |
538 | out: |
539 | res->nh = nh; | |
540 | res->fib6_type = res->f6i->fib6_type; | |
541 | res->fib6_flags = res->f6i->fib6_flags; | |
f88d8ea6 DA |
542 | return; |
543 | ||
544 | out_blackhole: | |
545 | res->fib6_flags |= RTF_REJECT; | |
546 | res->fib6_type = RTN_BLACKHOLE; | |
547 | res->nh = nh; | |
1da177e4 LT |
548 | } |
549 | ||
27097255 | 550 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
551 | struct __rt6_probe_work { |
552 | struct work_struct work; | |
553 | struct in6_addr target; | |
554 | struct net_device *dev; | |
555 | }; | |
556 | ||
557 | static void rt6_probe_deferred(struct work_struct *w) | |
558 | { | |
559 | struct in6_addr mcaddr; | |
560 | struct __rt6_probe_work *work = | |
561 | container_of(w, struct __rt6_probe_work, work); | |
562 | ||
563 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 564 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 565 | dev_put(work->dev); |
662f5533 | 566 | kfree(work); |
c2f17e82 HFS |
567 | } |
568 | ||
cc3a86c8 | 569 | static void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 570 | { |
f547fac6 | 571 | struct __rt6_probe_work *work = NULL; |
5e670d84 | 572 | const struct in6_addr *nh_gw; |
f2c31e32 | 573 | struct neighbour *neigh; |
5e670d84 | 574 | struct net_device *dev; |
f547fac6 | 575 | struct inet6_dev *idev; |
5e670d84 | 576 | |
27097255 YH |
577 | /* |
578 | * Okay, this does not seem to be appropriate | |
579 | * for now, however, we need to check if it | |
580 | * is really so; aka Router Reachability Probing. | |
581 | * | |
582 | * Router Reachability Probe MUST be rate-limited | |
583 | * to no more than one per minute. | |
584 | */ | |
cc3a86c8 | 585 | if (fib6_nh->fib_nh_gw_family) |
7ff74a59 | 586 | return; |
5e670d84 | 587 | |
cc3a86c8 DA |
588 | nh_gw = &fib6_nh->fib_nh_gw6; |
589 | dev = fib6_nh->fib_nh_dev; | |
2152caea | 590 | rcu_read_lock_bh(); |
f547fac6 | 591 | idev = __in6_dev_get(dev); |
5e670d84 | 592 | neigh = __ipv6_neigh_lookup_noref(dev, nh_gw); |
2152caea | 593 | if (neigh) { |
8d6c31bf MKL |
594 | if (neigh->nud_state & NUD_VALID) |
595 | goto out; | |
596 | ||
2152caea | 597 | write_lock(&neigh->lock); |
990edb42 MKL |
598 | if (!(neigh->nud_state & NUD_VALID) && |
599 | time_after(jiffies, | |
dcd1f572 | 600 | neigh->updated + idev->cnf.rtr_probe_interval)) { |
990edb42 MKL |
601 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
602 | if (work) | |
603 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 604 | } |
2152caea | 605 | write_unlock(&neigh->lock); |
cc3a86c8 | 606 | } else if (time_after(jiffies, fib6_nh->last_probe + |
f547fac6 | 607 | idev->cnf.rtr_probe_interval)) { |
990edb42 | 608 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
f2c31e32 | 609 | } |
990edb42 MKL |
610 | |
611 | if (work) { | |
cc3a86c8 | 612 | fib6_nh->last_probe = jiffies; |
990edb42 | 613 | INIT_WORK(&work->work, rt6_probe_deferred); |
5e670d84 DA |
614 | work->target = *nh_gw; |
615 | dev_hold(dev); | |
616 | work->dev = dev; | |
990edb42 MKL |
617 | schedule_work(&work->work); |
618 | } | |
619 | ||
8d6c31bf | 620 | out: |
2152caea | 621 | rcu_read_unlock_bh(); |
27097255 YH |
622 | } |
623 | #else | |
cc3a86c8 | 624 | static inline void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 625 | { |
27097255 YH |
626 | } |
627 | #endif | |
628 | ||
1da177e4 | 629 | /* |
554cfb7e | 630 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 631 | */ |
1ba9a895 | 632 | static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh) |
1da177e4 | 633 | { |
afc154e9 | 634 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
5e670d84 | 635 | struct neighbour *neigh; |
f2c31e32 | 636 | |
145a3621 | 637 | rcu_read_lock_bh(); |
1ba9a895 DA |
638 | neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev, |
639 | &fib6_nh->fib_nh_gw6); | |
145a3621 YH |
640 | if (neigh) { |
641 | read_lock(&neigh->lock); | |
554cfb7e | 642 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 643 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 644 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 645 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 646 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
647 | else |
648 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 649 | #endif |
145a3621 | 650 | read_unlock(&neigh->lock); |
afc154e9 HFS |
651 | } else { |
652 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 653 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 654 | } |
145a3621 YH |
655 | rcu_read_unlock_bh(); |
656 | ||
a5a81f0b | 657 | return ret; |
1da177e4 LT |
658 | } |
659 | ||
702cea56 DA |
660 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
661 | int strict) | |
1da177e4 | 662 | { |
6e1809a5 DA |
663 | int m = 0; |
664 | ||
665 | if (!oif || nh->fib_nh_dev->ifindex == oif) | |
666 | m = 2; | |
1ab1457c | 667 | |
77d16f45 | 668 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 669 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 | 670 | #ifdef CONFIG_IPV6_ROUTER_PREF |
702cea56 | 671 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2; |
ebacaaa0 | 672 | #endif |
1ba9a895 | 673 | if ((strict & RT6_LOOKUP_F_REACHABLE) && |
702cea56 | 674 | !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) { |
1ba9a895 | 675 | int n = rt6_check_neigh(nh); |
afc154e9 HFS |
676 | if (n < 0) |
677 | return n; | |
678 | } | |
554cfb7e YH |
679 | return m; |
680 | } | |
681 | ||
28679ed1 DA |
682 | static bool find_match(struct fib6_nh *nh, u32 fib6_flags, |
683 | int oif, int strict, int *mpri, bool *do_rr) | |
554cfb7e | 684 | { |
afc154e9 | 685 | bool match_do_rr = false; |
28679ed1 DA |
686 | bool rc = false; |
687 | int m; | |
35103d11 | 688 | |
28679ed1 | 689 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
8067bb8c IS |
690 | goto out; |
691 | ||
28679ed1 DA |
692 | if (ip6_ignore_linkdown(nh->fib_nh_dev) && |
693 | nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
d5d32e4b | 694 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) |
35103d11 | 695 | goto out; |
f11e6659 | 696 | |
28679ed1 | 697 | m = rt6_score_route(nh, fib6_flags, oif, strict); |
7e980569 | 698 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
699 | match_do_rr = true; |
700 | m = 0; /* lowest valid score */ | |
7e980569 | 701 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 702 | goto out; |
afc154e9 HFS |
703 | } |
704 | ||
705 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
28679ed1 | 706 | rt6_probe(nh); |
f11e6659 | 707 | |
7e980569 | 708 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 709 | if (m > *mpri) { |
afc154e9 | 710 | *do_rr = match_do_rr; |
f11e6659 | 711 | *mpri = m; |
28679ed1 | 712 | rc = true; |
f11e6659 | 713 | } |
f11e6659 | 714 | out: |
28679ed1 | 715 | return rc; |
f11e6659 DM |
716 | } |
717 | ||
b7bc4b6a | 718 | static void __find_rr_leaf(struct fib6_info *f6i_start, |
30c15f03 | 719 | struct fib6_info *nomatch, u32 metric, |
b7bc4b6a | 720 | struct fib6_result *res, struct fib6_info **cont, |
30c15f03 | 721 | int oif, int strict, bool *do_rr, int *mpri) |
f11e6659 | 722 | { |
b7bc4b6a | 723 | struct fib6_info *f6i; |
1da177e4 | 724 | |
b7bc4b6a DA |
725 | for (f6i = f6i_start; |
726 | f6i && f6i != nomatch; | |
727 | f6i = rcu_dereference(f6i->fib6_next)) { | |
30c15f03 DA |
728 | struct fib6_nh *nh; |
729 | ||
b7bc4b6a DA |
730 | if (cont && f6i->fib6_metric != metric) { |
731 | *cont = f6i; | |
30c15f03 | 732 | return; |
9fbdcfaf SK |
733 | } |
734 | ||
b7bc4b6a | 735 | if (fib6_check_expired(f6i)) |
28679ed1 DA |
736 | continue; |
737 | ||
1cf844c7 | 738 | nh = f6i->fib6_nh; |
b7bc4b6a DA |
739 | if (find_match(nh, f6i->fib6_flags, oif, strict, mpri, do_rr)) { |
740 | res->f6i = f6i; | |
741 | res->nh = nh; | |
7d21fec9 DA |
742 | res->fib6_flags = f6i->fib6_flags; |
743 | res->fib6_type = f6i->fib6_type; | |
b7bc4b6a | 744 | } |
9fbdcfaf | 745 | } |
30c15f03 | 746 | } |
9fbdcfaf | 747 | |
b7bc4b6a DA |
748 | static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf, |
749 | struct fib6_info *rr_head, int oif, int strict, | |
750 | bool *do_rr, struct fib6_result *res) | |
30c15f03 | 751 | { |
b7bc4b6a DA |
752 | u32 metric = rr_head->fib6_metric; |
753 | struct fib6_info *cont = NULL; | |
30c15f03 | 754 | int mpri = -1; |
9fbdcfaf | 755 | |
b7bc4b6a | 756 | __find_rr_leaf(rr_head, NULL, metric, res, &cont, |
30c15f03 | 757 | oif, strict, do_rr, &mpri); |
28679ed1 | 758 | |
b7bc4b6a | 759 | __find_rr_leaf(leaf, rr_head, metric, res, &cont, |
30c15f03 | 760 | oif, strict, do_rr, &mpri); |
9fbdcfaf | 761 | |
b7bc4b6a DA |
762 | if (res->f6i || !cont) |
763 | return; | |
9fbdcfaf | 764 | |
b7bc4b6a | 765 | __find_rr_leaf(cont, NULL, metric, res, NULL, |
30c15f03 | 766 | oif, strict, do_rr, &mpri); |
f11e6659 | 767 | } |
1da177e4 | 768 | |
b7bc4b6a DA |
769 | static void rt6_select(struct net *net, struct fib6_node *fn, int oif, |
770 | struct fib6_result *res, int strict) | |
f11e6659 | 771 | { |
8d1c802b | 772 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
b7bc4b6a | 773 | struct fib6_info *rt0; |
afc154e9 | 774 | bool do_rr = false; |
17ecf590 | 775 | int key_plen; |
1da177e4 | 776 | |
b7bc4b6a DA |
777 | /* make sure this function or its helpers sets f6i */ |
778 | res->f6i = NULL; | |
779 | ||
421842ed | 780 | if (!leaf || leaf == net->ipv6.fib6_null_entry) |
b7bc4b6a | 781 | goto out; |
8d1040e8 | 782 | |
66f5d6ce | 783 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 784 | if (!rt0) |
66f5d6ce | 785 | rt0 = leaf; |
1da177e4 | 786 | |
17ecf590 WW |
787 | /* Double check to make sure fn is not an intermediate node |
788 | * and fn->leaf does not points to its child's leaf | |
789 | * (This might happen if all routes under fn are deleted from | |
790 | * the tree and fib6_repair_tree() is called on the node.) | |
791 | */ | |
93c2fb25 | 792 | key_plen = rt0->fib6_dst.plen; |
17ecf590 | 793 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
794 | if (rt0->fib6_src.plen) |
795 | key_plen = rt0->fib6_src.plen; | |
17ecf590 WW |
796 | #endif |
797 | if (fn->fn_bit != key_plen) | |
b7bc4b6a | 798 | goto out; |
1da177e4 | 799 | |
b7bc4b6a | 800 | find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res); |
afc154e9 | 801 | if (do_rr) { |
8fb11a9a | 802 | struct fib6_info *next = rcu_dereference(rt0->fib6_next); |
f11e6659 | 803 | |
554cfb7e | 804 | /* no entries matched; do round-robin */ |
93c2fb25 | 805 | if (!next || next->fib6_metric != rt0->fib6_metric) |
8d1040e8 | 806 | next = leaf; |
f11e6659 | 807 | |
66f5d6ce | 808 | if (next != rt0) { |
93c2fb25 | 809 | spin_lock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 810 | /* make sure next is not being deleted from the tree */ |
93c2fb25 | 811 | if (next->fib6_node) |
66f5d6ce | 812 | rcu_assign_pointer(fn->rr_ptr, next); |
93c2fb25 | 813 | spin_unlock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 814 | } |
1da177e4 | 815 | } |
1da177e4 | 816 | |
b7bc4b6a DA |
817 | out: |
818 | if (!res->f6i) { | |
819 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 820 | res->nh = res->f6i->fib6_nh; |
7d21fec9 DA |
821 | res->fib6_flags = res->f6i->fib6_flags; |
822 | res->fib6_type = res->f6i->fib6_type; | |
b7bc4b6a | 823 | } |
1da177e4 LT |
824 | } |
825 | ||
85bd05de | 826 | static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res) |
8b9df265 | 827 | { |
85bd05de DA |
828 | return (res->f6i->fib6_flags & RTF_NONEXTHOP) || |
829 | res->nh->fib_nh_gw_family; | |
8b9df265 MKL |
830 | } |
831 | ||
70ceb4f5 YH |
832 | #ifdef CONFIG_IPV6_ROUTE_INFO |
833 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 834 | const struct in6_addr *gwaddr) |
70ceb4f5 | 835 | { |
c346dca1 | 836 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
837 | struct route_info *rinfo = (struct route_info *) opt; |
838 | struct in6_addr prefix_buf, *prefix; | |
839 | unsigned int pref; | |
4bed72e4 | 840 | unsigned long lifetime; |
8d1c802b | 841 | struct fib6_info *rt; |
70ceb4f5 YH |
842 | |
843 | if (len < sizeof(struct route_info)) { | |
844 | return -EINVAL; | |
845 | } | |
846 | ||
847 | /* Sanity check for prefix_len and length */ | |
848 | if (rinfo->length > 3) { | |
849 | return -EINVAL; | |
850 | } else if (rinfo->prefix_len > 128) { | |
851 | return -EINVAL; | |
852 | } else if (rinfo->prefix_len > 64) { | |
853 | if (rinfo->length < 2) { | |
854 | return -EINVAL; | |
855 | } | |
856 | } else if (rinfo->prefix_len > 0) { | |
857 | if (rinfo->length < 1) { | |
858 | return -EINVAL; | |
859 | } | |
860 | } | |
861 | ||
862 | pref = rinfo->route_pref; | |
863 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 864 | return -EINVAL; |
70ceb4f5 | 865 | |
4bed72e4 | 866 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
867 | |
868 | if (rinfo->length == 3) | |
869 | prefix = (struct in6_addr *)rinfo->prefix; | |
870 | else { | |
871 | /* this function is safe */ | |
872 | ipv6_addr_prefix(&prefix_buf, | |
873 | (struct in6_addr *)rinfo->prefix, | |
874 | rinfo->prefix_len); | |
875 | prefix = &prefix_buf; | |
876 | } | |
877 | ||
f104a567 | 878 | if (rinfo->prefix_len == 0) |
afb1d4b5 | 879 | rt = rt6_get_dflt_router(net, gwaddr, dev); |
f104a567 DJ |
880 | else |
881 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 882 | gwaddr, dev); |
70ceb4f5 YH |
883 | |
884 | if (rt && !lifetime) { | |
afb1d4b5 | 885 | ip6_del_rt(net, rt); |
70ceb4f5 YH |
886 | rt = NULL; |
887 | } | |
888 | ||
889 | if (!rt && lifetime) | |
830218c1 DA |
890 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
891 | dev, pref); | |
70ceb4f5 | 892 | else if (rt) |
93c2fb25 DA |
893 | rt->fib6_flags = RTF_ROUTEINFO | |
894 | (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
70ceb4f5 YH |
895 | |
896 | if (rt) { | |
1716a961 | 897 | if (!addrconf_finite_timeout(lifetime)) |
14895687 | 898 | fib6_clean_expires(rt); |
1716a961 | 899 | else |
14895687 | 900 | fib6_set_expires(rt, jiffies + HZ * lifetime); |
1716a961 | 901 | |
93531c67 | 902 | fib6_info_release(rt); |
70ceb4f5 YH |
903 | } |
904 | return 0; | |
905 | } | |
906 | #endif | |
907 | ||
ae90d867 DA |
908 | /* |
909 | * Misc support functions | |
910 | */ | |
911 | ||
912 | /* called with rcu_lock held */ | |
0d161581 | 913 | static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res) |
ae90d867 | 914 | { |
0d161581 | 915 | struct net_device *dev = res->nh->fib_nh_dev; |
ae90d867 | 916 | |
7d21fec9 | 917 | if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
ae90d867 DA |
918 | /* for copies of local routes, dst->dev needs to be the |
919 | * device if it is a master device, the master device if | |
920 | * device is enslaved, and the loopback as the default | |
921 | */ | |
922 | if (netif_is_l3_slave(dev) && | |
7d21fec9 | 923 | !rt6_need_strict(&res->f6i->fib6_dst.addr)) |
ae90d867 DA |
924 | dev = l3mdev_master_dev_rcu(dev); |
925 | else if (!netif_is_l3_master(dev)) | |
926 | dev = dev_net(dev)->loopback_dev; | |
927 | /* last case is netif_is_l3_master(dev) is true in which | |
928 | * case we want dev returned to be dev | |
929 | */ | |
930 | } | |
931 | ||
932 | return dev; | |
933 | } | |
934 | ||
6edb3c96 DA |
935 | static const int fib6_prop[RTN_MAX + 1] = { |
936 | [RTN_UNSPEC] = 0, | |
937 | [RTN_UNICAST] = 0, | |
938 | [RTN_LOCAL] = 0, | |
939 | [RTN_BROADCAST] = 0, | |
940 | [RTN_ANYCAST] = 0, | |
941 | [RTN_MULTICAST] = 0, | |
942 | [RTN_BLACKHOLE] = -EINVAL, | |
943 | [RTN_UNREACHABLE] = -EHOSTUNREACH, | |
944 | [RTN_PROHIBIT] = -EACCES, | |
945 | [RTN_THROW] = -EAGAIN, | |
946 | [RTN_NAT] = -EINVAL, | |
947 | [RTN_XRESOLVE] = -EINVAL, | |
948 | }; | |
949 | ||
950 | static int ip6_rt_type_to_error(u8 fib6_type) | |
951 | { | |
952 | return fib6_prop[fib6_type]; | |
953 | } | |
954 | ||
8d1c802b | 955 | static unsigned short fib6_info_dst_flags(struct fib6_info *rt) |
3b6761d1 DA |
956 | { |
957 | unsigned short flags = 0; | |
958 | ||
959 | if (rt->dst_nocount) | |
960 | flags |= DST_NOCOUNT; | |
961 | if (rt->dst_nopolicy) | |
962 | flags |= DST_NOPOLICY; | |
963 | if (rt->dst_host) | |
964 | flags |= DST_HOST; | |
965 | ||
966 | return flags; | |
967 | } | |
968 | ||
7d21fec9 | 969 | static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) |
6edb3c96 | 970 | { |
7d21fec9 | 971 | rt->dst.error = ip6_rt_type_to_error(fib6_type); |
6edb3c96 | 972 | |
7d21fec9 | 973 | switch (fib6_type) { |
6edb3c96 DA |
974 | case RTN_BLACKHOLE: |
975 | rt->dst.output = dst_discard_out; | |
976 | rt->dst.input = dst_discard; | |
977 | break; | |
978 | case RTN_PROHIBIT: | |
979 | rt->dst.output = ip6_pkt_prohibit_out; | |
980 | rt->dst.input = ip6_pkt_prohibit; | |
981 | break; | |
982 | case RTN_THROW: | |
983 | case RTN_UNREACHABLE: | |
984 | default: | |
985 | rt->dst.output = ip6_pkt_discard_out; | |
986 | rt->dst.input = ip6_pkt_discard; | |
987 | break; | |
988 | } | |
989 | } | |
990 | ||
0d161581 | 991 | static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res) |
6edb3c96 | 992 | { |
7d21fec9 | 993 | struct fib6_info *f6i = res->f6i; |
0d161581 | 994 | |
7d21fec9 DA |
995 | if (res->fib6_flags & RTF_REJECT) { |
996 | ip6_rt_init_dst_reject(rt, res->fib6_type); | |
6edb3c96 DA |
997 | return; |
998 | } | |
999 | ||
1000 | rt->dst.error = 0; | |
1001 | rt->dst.output = ip6_output; | |
1002 | ||
7d21fec9 | 1003 | if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) { |
6edb3c96 | 1004 | rt->dst.input = ip6_input; |
7d21fec9 | 1005 | } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) { |
6edb3c96 DA |
1006 | rt->dst.input = ip6_mc_input; |
1007 | } else { | |
1008 | rt->dst.input = ip6_forward; | |
1009 | } | |
1010 | ||
0d161581 DA |
1011 | if (res->nh->fib_nh_lws) { |
1012 | rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws); | |
6edb3c96 DA |
1013 | lwtunnel_set_redirect(&rt->dst); |
1014 | } | |
1015 | ||
1016 | rt->dst.lastuse = jiffies; | |
1017 | } | |
1018 | ||
e873e4b9 | 1019 | /* Caller must already hold reference to @from */ |
8d1c802b | 1020 | static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) |
ae90d867 | 1021 | { |
ae90d867 | 1022 | rt->rt6i_flags &= ~RTF_EXPIRES; |
a68886a6 | 1023 | rcu_assign_pointer(rt->from, from); |
e1255ed4 | 1024 | ip_dst_init_metrics(&rt->dst, from->fib6_metrics); |
ae90d867 DA |
1025 | } |
1026 | ||
0d161581 DA |
1027 | /* Caller must already hold reference to f6i in result */ |
1028 | static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res) | |
ae90d867 | 1029 | { |
0d161581 DA |
1030 | const struct fib6_nh *nh = res->nh; |
1031 | const struct net_device *dev = nh->fib_nh_dev; | |
1032 | struct fib6_info *f6i = res->f6i; | |
dcd1f572 | 1033 | |
0d161581 | 1034 | ip6_rt_init_dst(rt, res); |
6edb3c96 | 1035 | |
0d161581 | 1036 | rt->rt6i_dst = f6i->fib6_dst; |
dcd1f572 | 1037 | rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; |
7d21fec9 | 1038 | rt->rt6i_flags = res->fib6_flags; |
0d161581 DA |
1039 | if (nh->fib_nh_gw_family) { |
1040 | rt->rt6i_gateway = nh->fib_nh_gw6; | |
2b2450ca DA |
1041 | rt->rt6i_flags |= RTF_GATEWAY; |
1042 | } | |
0d161581 | 1043 | rt6_set_from(rt, f6i); |
ae90d867 | 1044 | #ifdef CONFIG_IPV6_SUBTREES |
0d161581 | 1045 | rt->rt6i_src = f6i->fib6_src; |
ae90d867 | 1046 | #endif |
ae90d867 DA |
1047 | } |
1048 | ||
a3c00e46 MKL |
1049 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
1050 | struct in6_addr *saddr) | |
1051 | { | |
66f5d6ce | 1052 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
1053 | while (1) { |
1054 | if (fn->fn_flags & RTN_TL_ROOT) | |
1055 | return NULL; | |
66f5d6ce WW |
1056 | pn = rcu_dereference(fn->parent); |
1057 | sn = FIB6_SUBTREE(pn); | |
1058 | if (sn && sn != fn) | |
6454743b | 1059 | fn = fib6_node_lookup(sn, NULL, saddr); |
a3c00e46 MKL |
1060 | else |
1061 | fn = pn; | |
1062 | if (fn->fn_flags & RTN_RTINFO) | |
1063 | return fn; | |
1064 | } | |
1065 | } | |
c71099ac | 1066 | |
10585b43 | 1067 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt) |
d3843fe5 WW |
1068 | { |
1069 | struct rt6_info *rt = *prt; | |
1070 | ||
1071 | if (dst_hold_safe(&rt->dst)) | |
1072 | return true; | |
10585b43 | 1073 | if (net) { |
d3843fe5 WW |
1074 | rt = net->ipv6.ip6_null_entry; |
1075 | dst_hold(&rt->dst); | |
1076 | } else { | |
1077 | rt = NULL; | |
1078 | } | |
1079 | *prt = rt; | |
1080 | return false; | |
1081 | } | |
1082 | ||
dec9b0e2 | 1083 | /* called with rcu_lock held */ |
9b6b35ab | 1084 | static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res) |
dec9b0e2 | 1085 | { |
9b6b35ab DA |
1086 | struct net_device *dev = res->nh->fib_nh_dev; |
1087 | struct fib6_info *f6i = res->f6i; | |
1088 | unsigned short flags; | |
dec9b0e2 DA |
1089 | struct rt6_info *nrt; |
1090 | ||
9b6b35ab | 1091 | if (!fib6_info_hold_safe(f6i)) |
1c87e79a | 1092 | goto fallback; |
e873e4b9 | 1093 | |
9b6b35ab | 1094 | flags = fib6_info_dst_flags(f6i); |
93531c67 | 1095 | nrt = ip6_dst_alloc(dev_net(dev), dev, flags); |
1c87e79a | 1096 | if (!nrt) { |
9b6b35ab | 1097 | fib6_info_release(f6i); |
1c87e79a XL |
1098 | goto fallback; |
1099 | } | |
dec9b0e2 | 1100 | |
0d161581 | 1101 | ip6_rt_copy_init(nrt, res); |
1c87e79a XL |
1102 | return nrt; |
1103 | ||
1104 | fallback: | |
1105 | nrt = dev_net(dev)->ipv6.ip6_null_entry; | |
1106 | dst_hold(&nrt->dst); | |
dec9b0e2 DA |
1107 | return nrt; |
1108 | } | |
1109 | ||
8ed67789 DL |
1110 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
1111 | struct fib6_table *table, | |
b75cc8f9 DA |
1112 | struct flowi6 *fl6, |
1113 | const struct sk_buff *skb, | |
1114 | int flags) | |
1da177e4 | 1115 | { |
b1d40991 | 1116 | struct fib6_result res = {}; |
1da177e4 | 1117 | struct fib6_node *fn; |
23fb93a4 | 1118 | struct rt6_info *rt; |
1da177e4 | 1119 | |
b6cdbc85 DA |
1120 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1121 | flags &= ~RT6_LOOKUP_F_IFACE; | |
1122 | ||
66f5d6ce | 1123 | rcu_read_lock(); |
6454743b | 1124 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 1125 | restart: |
b1d40991 DA |
1126 | res.f6i = rcu_dereference(fn->leaf); |
1127 | if (!res.f6i) | |
1128 | res.f6i = net->ipv6.fib6_null_entry; | |
af52a52c | 1129 | else |
75ef7389 DA |
1130 | rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif, |
1131 | flags); | |
af52a52c | 1132 | |
b1d40991 | 1133 | if (res.f6i == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
1134 | fn = fib6_backtrack(fn, &fl6->saddr); |
1135 | if (fn) | |
1136 | goto restart; | |
2b760fcf | 1137 | |
af52a52c DA |
1138 | rt = net->ipv6.ip6_null_entry; |
1139 | dst_hold(&rt->dst); | |
1140 | goto out; | |
f88d8ea6 DA |
1141 | } else if (res.fib6_flags & RTF_REJECT) { |
1142 | goto do_create; | |
af52a52c | 1143 | } |
d3843fe5 | 1144 | |
b1d40991 DA |
1145 | fib6_select_path(net, &res, fl6, fl6->flowi6_oif, |
1146 | fl6->flowi6_oif != 0, skb, flags); | |
1147 | ||
2b760fcf | 1148 | /* Search through exception table */ |
7e4b5128 | 1149 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 1150 | if (rt) { |
10585b43 | 1151 | if (ip6_hold_safe(net, &rt)) |
dec9b0e2 | 1152 | dst_use_noref(&rt->dst, jiffies); |
23fb93a4 | 1153 | } else { |
f88d8ea6 | 1154 | do_create: |
9b6b35ab | 1155 | rt = ip6_create_rt_rcu(&res); |
dec9b0e2 | 1156 | } |
b811580d | 1157 | |
af52a52c | 1158 | out: |
8ff2e5b2 | 1159 | trace_fib6_table_lookup(net, &res, table, fl6); |
af52a52c | 1160 | |
66f5d6ce | 1161 | rcu_read_unlock(); |
b811580d | 1162 | |
c71099ac | 1163 | return rt; |
c71099ac TG |
1164 | } |
1165 | ||
67ba4152 | 1166 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 1167 | const struct sk_buff *skb, int flags) |
ea6e574e | 1168 | { |
b75cc8f9 | 1169 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup); |
ea6e574e FW |
1170 | } |
1171 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
1172 | ||
9acd9f3a | 1173 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
1174 | const struct in6_addr *saddr, int oif, |
1175 | const struct sk_buff *skb, int strict) | |
c71099ac | 1176 | { |
4c9483b2 DM |
1177 | struct flowi6 fl6 = { |
1178 | .flowi6_oif = oif, | |
1179 | .daddr = *daddr, | |
c71099ac TG |
1180 | }; |
1181 | struct dst_entry *dst; | |
77d16f45 | 1182 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 1183 | |
adaa70bb | 1184 | if (saddr) { |
4c9483b2 | 1185 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
1186 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1187 | } | |
1188 | ||
b75cc8f9 | 1189 | dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup); |
c71099ac TG |
1190 | if (dst->error == 0) |
1191 | return (struct rt6_info *) dst; | |
1192 | ||
1193 | dst_release(dst); | |
1194 | ||
1da177e4 LT |
1195 | return NULL; |
1196 | } | |
7159039a YH |
1197 | EXPORT_SYMBOL(rt6_lookup); |
1198 | ||
c71099ac | 1199 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
1200 | * It takes new route entry, the addition fails by any reason the |
1201 | * route is released. | |
1202 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1203 | */ |
1204 | ||
8d1c802b | 1205 | static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info, |
333c4301 | 1206 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1207 | { |
1208 | int err; | |
c71099ac | 1209 | struct fib6_table *table; |
1da177e4 | 1210 | |
93c2fb25 | 1211 | table = rt->fib6_table; |
66f5d6ce | 1212 | spin_lock_bh(&table->tb6_lock); |
d4ead6b3 | 1213 | err = fib6_add(&table->tb6_root, rt, info, extack); |
66f5d6ce | 1214 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1215 | |
1216 | return err; | |
1217 | } | |
1218 | ||
8d1c802b | 1219 | int ip6_ins_rt(struct net *net, struct fib6_info *rt) |
40e22e8f | 1220 | { |
afb1d4b5 | 1221 | struct nl_info info = { .nl_net = net, }; |
e715b6d3 | 1222 | |
d4ead6b3 | 1223 | return __ip6_ins_rt(rt, &info, NULL); |
40e22e8f TG |
1224 | } |
1225 | ||
85bd05de | 1226 | static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, |
8b9df265 MKL |
1227 | const struct in6_addr *daddr, |
1228 | const struct in6_addr *saddr) | |
1da177e4 | 1229 | { |
85bd05de | 1230 | struct fib6_info *f6i = res->f6i; |
4832c30d | 1231 | struct net_device *dev; |
1da177e4 LT |
1232 | struct rt6_info *rt; |
1233 | ||
1234 | /* | |
1235 | * Clone the route. | |
1236 | */ | |
1237 | ||
85bd05de | 1238 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1239 | return NULL; |
1240 | ||
0d161581 | 1241 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1242 | rt = ip6_dst_alloc(dev_net(dev), dev, 0); |
e873e4b9 | 1243 | if (!rt) { |
85bd05de | 1244 | fib6_info_release(f6i); |
83a09abd | 1245 | return NULL; |
e873e4b9 | 1246 | } |
83a09abd | 1247 | |
0d161581 | 1248 | ip6_rt_copy_init(rt, res); |
83a09abd | 1249 | rt->rt6i_flags |= RTF_CACHE; |
83a09abd MKL |
1250 | rt->dst.flags |= DST_HOST; |
1251 | rt->rt6i_dst.addr = *daddr; | |
1252 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1253 | |
85bd05de DA |
1254 | if (!rt6_is_gw_or_nonexthop(res)) { |
1255 | if (f6i->fib6_dst.plen != 128 && | |
1256 | ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) | |
83a09abd | 1257 | rt->rt6i_flags |= RTF_ANYCAST; |
1da177e4 | 1258 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1259 | if (rt->rt6i_src.plen && saddr) { |
1260 | rt->rt6i_src.addr = *saddr; | |
1261 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1262 | } |
83a09abd | 1263 | #endif |
95a9a5ba | 1264 | } |
1da177e4 | 1265 | |
95a9a5ba YH |
1266 | return rt; |
1267 | } | |
1da177e4 | 1268 | |
db3fedee | 1269 | static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res) |
d52d3997 | 1270 | { |
db3fedee DA |
1271 | struct fib6_info *f6i = res->f6i; |
1272 | unsigned short flags = fib6_info_dst_flags(f6i); | |
4832c30d | 1273 | struct net_device *dev; |
d52d3997 MKL |
1274 | struct rt6_info *pcpu_rt; |
1275 | ||
db3fedee | 1276 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1277 | return NULL; |
1278 | ||
4832c30d | 1279 | rcu_read_lock(); |
0d161581 | 1280 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1281 | pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags); |
4832c30d | 1282 | rcu_read_unlock(); |
e873e4b9 | 1283 | if (!pcpu_rt) { |
db3fedee | 1284 | fib6_info_release(f6i); |
d52d3997 | 1285 | return NULL; |
e873e4b9 | 1286 | } |
0d161581 | 1287 | ip6_rt_copy_init(pcpu_rt, res); |
d52d3997 MKL |
1288 | pcpu_rt->rt6i_flags |= RTF_PCPU; |
1289 | return pcpu_rt; | |
1290 | } | |
1291 | ||
66f5d6ce | 1292 | /* It should be called with rcu_read_lock() acquired */ |
db3fedee | 1293 | static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res) |
d52d3997 | 1294 | { |
c353071a | 1295 | struct rt6_info *pcpu_rt; |
d52d3997 | 1296 | |
c353071a | 1297 | pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu); |
d52d3997 | 1298 | |
d4ead6b3 | 1299 | if (pcpu_rt) |
10585b43 | 1300 | ip6_hold_safe(NULL, &pcpu_rt); |
d3843fe5 | 1301 | |
a73e4195 MKL |
1302 | return pcpu_rt; |
1303 | } | |
1304 | ||
afb1d4b5 | 1305 | static struct rt6_info *rt6_make_pcpu_route(struct net *net, |
db3fedee | 1306 | const struct fib6_result *res) |
a73e4195 MKL |
1307 | { |
1308 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 | 1309 | |
db3fedee | 1310 | pcpu_rt = ip6_rt_pcpu_alloc(res); |
d52d3997 | 1311 | if (!pcpu_rt) { |
9c7370a1 MKL |
1312 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1313 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1314 | } |
1315 | ||
a94b9367 | 1316 | dst_hold(&pcpu_rt->dst); |
f40b6ae2 | 1317 | p = this_cpu_ptr(res->nh->rt6i_pcpu); |
a94b9367 | 1318 | prev = cmpxchg(p, NULL, pcpu_rt); |
951f788a | 1319 | BUG_ON(prev); |
a94b9367 | 1320 | |
61fb0d01 ED |
1321 | if (res->f6i->fib6_destroying) { |
1322 | struct fib6_info *from; | |
1323 | ||
1324 | from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); | |
1325 | fib6_info_release(from); | |
1326 | } | |
1327 | ||
d52d3997 MKL |
1328 | return pcpu_rt; |
1329 | } | |
1330 | ||
35732d01 WW |
1331 | /* exception hash table implementation |
1332 | */ | |
1333 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1334 | ||
1335 | /* Remove rt6_ex from hash table and free the memory | |
1336 | * Caller must hold rt6_exception_lock | |
1337 | */ | |
1338 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1339 | struct rt6_exception *rt6_ex) | |
1340 | { | |
f5b51fe8 | 1341 | struct fib6_info *from; |
b2427e67 | 1342 | struct net *net; |
81eb8447 | 1343 | |
35732d01 WW |
1344 | if (!bucket || !rt6_ex) |
1345 | return; | |
b2427e67 CIK |
1346 | |
1347 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
f5b51fe8 PA |
1348 | net->ipv6.rt6_stats->fib_rt_cache--; |
1349 | ||
1350 | /* purge completely the exception to allow releasing the held resources: | |
1351 | * some [sk] cache may keep the dst around for unlimited time | |
1352 | */ | |
0e233874 | 1353 | from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL); |
f5b51fe8 PA |
1354 | fib6_info_release(from); |
1355 | dst_dev_put(&rt6_ex->rt6i->dst); | |
1356 | ||
35732d01 | 1357 | hlist_del_rcu(&rt6_ex->hlist); |
77634cc6 | 1358 | dst_release(&rt6_ex->rt6i->dst); |
35732d01 WW |
1359 | kfree_rcu(rt6_ex, rcu); |
1360 | WARN_ON_ONCE(!bucket->depth); | |
1361 | bucket->depth--; | |
1362 | } | |
1363 | ||
1364 | /* Remove oldest rt6_ex in bucket and free the memory | |
1365 | * Caller must hold rt6_exception_lock | |
1366 | */ | |
1367 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1368 | { | |
1369 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1370 | ||
1371 | if (!bucket) | |
1372 | return; | |
1373 | ||
1374 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1375 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1376 | oldest = rt6_ex; | |
1377 | } | |
1378 | rt6_remove_exception(bucket, oldest); | |
1379 | } | |
1380 | ||
1381 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1382 | const struct in6_addr *src) | |
1383 | { | |
1384 | static u32 seed __read_mostly; | |
1385 | u32 val; | |
1386 | ||
1387 | net_get_random_once(&seed, sizeof(seed)); | |
1388 | val = jhash(dst, sizeof(*dst), seed); | |
1389 | ||
1390 | #ifdef CONFIG_IPV6_SUBTREES | |
1391 | if (src) | |
1392 | val = jhash(src, sizeof(*src), val); | |
1393 | #endif | |
1394 | return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
1395 | } | |
1396 | ||
1397 | /* Helper function to find the cached rt in the hash table | |
1398 | * and update bucket pointer to point to the bucket for this | |
1399 | * (daddr, saddr) pair | |
1400 | * Caller must hold rt6_exception_lock | |
1401 | */ | |
1402 | static struct rt6_exception * | |
1403 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1404 | const struct in6_addr *daddr, | |
1405 | const struct in6_addr *saddr) | |
1406 | { | |
1407 | struct rt6_exception *rt6_ex; | |
1408 | u32 hval; | |
1409 | ||
1410 | if (!(*bucket) || !daddr) | |
1411 | return NULL; | |
1412 | ||
1413 | hval = rt6_exception_hash(daddr, saddr); | |
1414 | *bucket += hval; | |
1415 | ||
1416 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1417 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1418 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1419 | ||
1420 | #ifdef CONFIG_IPV6_SUBTREES | |
1421 | if (matched && saddr) | |
1422 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1423 | #endif | |
1424 | if (matched) | |
1425 | return rt6_ex; | |
1426 | } | |
1427 | return NULL; | |
1428 | } | |
1429 | ||
1430 | /* Helper function to find the cached rt in the hash table | |
1431 | * and update bucket pointer to point to the bucket for this | |
1432 | * (daddr, saddr) pair | |
1433 | * Caller must hold rcu_read_lock() | |
1434 | */ | |
1435 | static struct rt6_exception * | |
1436 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1437 | const struct in6_addr *daddr, | |
1438 | const struct in6_addr *saddr) | |
1439 | { | |
1440 | struct rt6_exception *rt6_ex; | |
1441 | u32 hval; | |
1442 | ||
1443 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1444 | ||
1445 | if (!(*bucket) || !daddr) | |
1446 | return NULL; | |
1447 | ||
1448 | hval = rt6_exception_hash(daddr, saddr); | |
1449 | *bucket += hval; | |
1450 | ||
1451 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1452 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1453 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1454 | ||
1455 | #ifdef CONFIG_IPV6_SUBTREES | |
1456 | if (matched && saddr) | |
1457 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1458 | #endif | |
1459 | if (matched) | |
1460 | return rt6_ex; | |
1461 | } | |
1462 | return NULL; | |
1463 | } | |
1464 | ||
b748f260 | 1465 | static unsigned int fib6_mtu(const struct fib6_result *res) |
d4ead6b3 | 1466 | { |
b748f260 | 1467 | const struct fib6_nh *nh = res->nh; |
d4ead6b3 DA |
1468 | unsigned int mtu; |
1469 | ||
b748f260 DA |
1470 | if (res->f6i->fib6_pmtu) { |
1471 | mtu = res->f6i->fib6_pmtu; | |
dcd1f572 | 1472 | } else { |
b748f260 | 1473 | struct net_device *dev = nh->fib_nh_dev; |
dcd1f572 DA |
1474 | struct inet6_dev *idev; |
1475 | ||
1476 | rcu_read_lock(); | |
1477 | idev = __in6_dev_get(dev); | |
1478 | mtu = idev->cnf.mtu6; | |
1479 | rcu_read_unlock(); | |
1480 | } | |
1481 | ||
d4ead6b3 DA |
1482 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1483 | ||
b748f260 | 1484 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
d4ead6b3 DA |
1485 | } |
1486 | ||
cc5c073a DA |
1487 | #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL |
1488 | ||
1489 | /* used when the flushed bit is not relevant, only access to the bucket | |
1490 | * (ie., all bucket users except rt6_insert_exception); | |
1491 | * | |
1492 | * called under rcu lock; sometimes called with rt6_exception_lock held | |
1493 | */ | |
1494 | static | |
1495 | struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh, | |
1496 | spinlock_t *lock) | |
1497 | { | |
1498 | struct rt6_exception_bucket *bucket; | |
1499 | ||
1500 | if (lock) | |
1501 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1502 | lockdep_is_held(lock)); | |
1503 | else | |
1504 | bucket = rcu_dereference(nh->rt6i_exception_bucket); | |
1505 | ||
1506 | /* remove bucket flushed bit if set */ | |
1507 | if (bucket) { | |
1508 | unsigned long p = (unsigned long)bucket; | |
1509 | ||
1510 | p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1511 | bucket = (struct rt6_exception_bucket *)p; | |
1512 | } | |
1513 | ||
1514 | return bucket; | |
1515 | } | |
1516 | ||
1517 | static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket) | |
1518 | { | |
1519 | unsigned long p = (unsigned long)bucket; | |
1520 | ||
1521 | return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED); | |
1522 | } | |
1523 | ||
1524 | /* called with rt6_exception_lock held */ | |
1525 | static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh, | |
1526 | spinlock_t *lock) | |
1527 | { | |
1528 | struct rt6_exception_bucket *bucket; | |
1529 | unsigned long p; | |
1530 | ||
1531 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1532 | lockdep_is_held(lock)); | |
1533 | ||
1534 | p = (unsigned long)bucket; | |
1535 | p |= FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1536 | bucket = (struct rt6_exception_bucket *)p; | |
1537 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); | |
1538 | } | |
1539 | ||
35732d01 | 1540 | static int rt6_insert_exception(struct rt6_info *nrt, |
5012f0a5 | 1541 | const struct fib6_result *res) |
35732d01 | 1542 | { |
5e670d84 | 1543 | struct net *net = dev_net(nrt->dst.dev); |
35732d01 | 1544 | struct rt6_exception_bucket *bucket; |
cc5c073a | 1545 | struct fib6_info *f6i = res->f6i; |
35732d01 WW |
1546 | struct in6_addr *src_key = NULL; |
1547 | struct rt6_exception *rt6_ex; | |
cc5c073a | 1548 | struct fib6_nh *nh = res->nh; |
35732d01 WW |
1549 | int err = 0; |
1550 | ||
35732d01 WW |
1551 | spin_lock_bh(&rt6_exception_lock); |
1552 | ||
cc5c073a DA |
1553 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, |
1554 | lockdep_is_held(&rt6_exception_lock)); | |
35732d01 WW |
1555 | if (!bucket) { |
1556 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1557 | GFP_ATOMIC); | |
1558 | if (!bucket) { | |
1559 | err = -ENOMEM; | |
1560 | goto out; | |
1561 | } | |
cc5c073a DA |
1562 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); |
1563 | } else if (fib6_nh_excptn_bucket_flushed(bucket)) { | |
1564 | err = -EINVAL; | |
1565 | goto out; | |
35732d01 WW |
1566 | } |
1567 | ||
1568 | #ifdef CONFIG_IPV6_SUBTREES | |
5012f0a5 | 1569 | /* fib6_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1570 | * and exception table is indexed by a hash of |
5012f0a5 | 1571 | * both fib6_dst and fib6_src. |
35732d01 | 1572 | * Otherwise, the exception table is indexed by |
5012f0a5 | 1573 | * a hash of only fib6_dst. |
35732d01 | 1574 | */ |
5012f0a5 | 1575 | if (f6i->fib6_src.plen) |
35732d01 WW |
1576 | src_key = &nrt->rt6i_src.addr; |
1577 | #endif | |
5012f0a5 | 1578 | /* rt6_mtu_change() might lower mtu on f6i. |
f5bbe7ee | 1579 | * Only insert this exception route if its mtu |
5012f0a5 | 1580 | * is less than f6i's mtu value. |
f5bbe7ee | 1581 | */ |
b748f260 | 1582 | if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) { |
f5bbe7ee WW |
1583 | err = -EINVAL; |
1584 | goto out; | |
1585 | } | |
60006a48 | 1586 | |
35732d01 WW |
1587 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1588 | src_key); | |
1589 | if (rt6_ex) | |
1590 | rt6_remove_exception(bucket, rt6_ex); | |
1591 | ||
1592 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1593 | if (!rt6_ex) { | |
1594 | err = -ENOMEM; | |
1595 | goto out; | |
1596 | } | |
1597 | rt6_ex->rt6i = nrt; | |
1598 | rt6_ex->stamp = jiffies; | |
35732d01 WW |
1599 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); |
1600 | bucket->depth++; | |
81eb8447 | 1601 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 WW |
1602 | |
1603 | if (bucket->depth > FIB6_MAX_DEPTH) | |
1604 | rt6_exception_remove_oldest(bucket); | |
1605 | ||
1606 | out: | |
1607 | spin_unlock_bh(&rt6_exception_lock); | |
1608 | ||
1609 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1610 | if (!err) { |
5012f0a5 DA |
1611 | spin_lock_bh(&f6i->fib6_table->tb6_lock); |
1612 | fib6_update_sernum(net, f6i); | |
1613 | spin_unlock_bh(&f6i->fib6_table->tb6_lock); | |
b886d5f2 PA |
1614 | fib6_force_start_gc(net); |
1615 | } | |
35732d01 WW |
1616 | |
1617 | return err; | |
1618 | } | |
1619 | ||
c0b220cf | 1620 | static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from) |
35732d01 WW |
1621 | { |
1622 | struct rt6_exception_bucket *bucket; | |
1623 | struct rt6_exception *rt6_ex; | |
1624 | struct hlist_node *tmp; | |
1625 | int i; | |
1626 | ||
1627 | spin_lock_bh(&rt6_exception_lock); | |
35732d01 | 1628 | |
cc5c073a | 1629 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
35732d01 WW |
1630 | if (!bucket) |
1631 | goto out; | |
1632 | ||
cc5c073a DA |
1633 | /* Prevent rt6_insert_exception() to recreate the bucket list */ |
1634 | if (!from) | |
1635 | fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock); | |
1636 | ||
35732d01 | 1637 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { |
cc5c073a DA |
1638 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) { |
1639 | if (!from || | |
1640 | rcu_access_pointer(rt6_ex->rt6i->from) == from) | |
1641 | rt6_remove_exception(bucket, rt6_ex); | |
1642 | } | |
1643 | WARN_ON_ONCE(!from && bucket->depth); | |
35732d01 WW |
1644 | bucket++; |
1645 | } | |
35732d01 WW |
1646 | out: |
1647 | spin_unlock_bh(&rt6_exception_lock); | |
1648 | } | |
1649 | ||
c0b220cf DA |
1650 | void rt6_flush_exceptions(struct fib6_info *f6i) |
1651 | { | |
1cf844c7 | 1652 | fib6_nh_flush_exceptions(f6i->fib6_nh, f6i); |
c0b220cf DA |
1653 | } |
1654 | ||
35732d01 WW |
1655 | /* Find cached rt in the hash table inside passed in rt |
1656 | * Caller has to hold rcu_read_lock() | |
1657 | */ | |
7e4b5128 | 1658 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
1659 | const struct in6_addr *daddr, |
1660 | const struct in6_addr *saddr) | |
35732d01 | 1661 | { |
510e2ced | 1662 | const struct in6_addr *src_key = NULL; |
35732d01 | 1663 | struct rt6_exception_bucket *bucket; |
35732d01 | 1664 | struct rt6_exception *rt6_ex; |
7e4b5128 | 1665 | struct rt6_info *ret = NULL; |
35732d01 | 1666 | |
35732d01 | 1667 | #ifdef CONFIG_IPV6_SUBTREES |
7e4b5128 | 1668 | /* fib6i_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1669 | * and exception table is indexed by a hash of |
7e4b5128 | 1670 | * both fib6_dst and fib6_src. |
510e2ced WW |
1671 | * However, the src addr used to create the hash |
1672 | * might not be exactly the passed in saddr which | |
1673 | * is a /128 addr from the flow. | |
1674 | * So we need to use f6i->fib6_src to redo lookup | |
1675 | * if the passed in saddr does not find anything. | |
1676 | * (See the logic in ip6_rt_cache_alloc() on how | |
1677 | * rt->rt6i_src is updated.) | |
35732d01 | 1678 | */ |
7e4b5128 | 1679 | if (res->f6i->fib6_src.plen) |
35732d01 | 1680 | src_key = saddr; |
510e2ced | 1681 | find_ex: |
35732d01 | 1682 | #endif |
cc5c073a | 1683 | bucket = fib6_nh_get_excptn_bucket(res->nh, NULL); |
35732d01 WW |
1684 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); |
1685 | ||
1686 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
7e4b5128 | 1687 | ret = rt6_ex->rt6i; |
35732d01 | 1688 | |
510e2ced WW |
1689 | #ifdef CONFIG_IPV6_SUBTREES |
1690 | /* Use fib6_src as src_key and redo lookup */ | |
1691 | if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) { | |
1692 | src_key = &res->f6i->fib6_src.addr; | |
1693 | goto find_ex; | |
1694 | } | |
1695 | #endif | |
1696 | ||
7e4b5128 | 1697 | return ret; |
35732d01 WW |
1698 | } |
1699 | ||
1700 | /* Remove the passed in cached rt from the hash table that contains it */ | |
cc5c073a | 1701 | static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1702 | const struct rt6_info *rt) |
35732d01 | 1703 | { |
c0b220cf | 1704 | const struct in6_addr *src_key = NULL; |
35732d01 | 1705 | struct rt6_exception_bucket *bucket; |
35732d01 WW |
1706 | struct rt6_exception *rt6_ex; |
1707 | int err; | |
1708 | ||
cc5c073a | 1709 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
35732d01 WW |
1710 | return -ENOENT; |
1711 | ||
1712 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a DA |
1713 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
1714 | ||
35732d01 | 1715 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1716 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1717 | * and exception table is indexed by a hash of | |
1718 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1719 | * Otherwise, the exception table is indexed by |
1720 | * a hash of only rt6i_dst. | |
1721 | */ | |
c0b220cf | 1722 | if (plen) |
35732d01 WW |
1723 | src_key = &rt->rt6i_src.addr; |
1724 | #endif | |
1725 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1726 | &rt->rt6i_dst.addr, | |
1727 | src_key); | |
1728 | if (rt6_ex) { | |
1729 | rt6_remove_exception(bucket, rt6_ex); | |
1730 | err = 0; | |
1731 | } else { | |
1732 | err = -ENOENT; | |
1733 | } | |
1734 | ||
1735 | spin_unlock_bh(&rt6_exception_lock); | |
1736 | return err; | |
1737 | } | |
1738 | ||
c0b220cf DA |
1739 | static int rt6_remove_exception_rt(struct rt6_info *rt) |
1740 | { | |
1741 | struct fib6_info *from; | |
1742 | ||
1743 | from = rcu_dereference(rt->from); | |
cc5c073a | 1744 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) |
c0b220cf DA |
1745 | return -EINVAL; |
1746 | ||
1cf844c7 | 1747 | return fib6_nh_remove_exception(from->fib6_nh, |
cc5c073a | 1748 | from->fib6_src.plen, rt); |
c0b220cf DA |
1749 | } |
1750 | ||
35732d01 WW |
1751 | /* Find rt6_ex which contains the passed in rt cache and |
1752 | * refresh its stamp | |
1753 | */ | |
cc5c073a | 1754 | static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1755 | const struct rt6_info *rt) |
35732d01 | 1756 | { |
c0b220cf | 1757 | const struct in6_addr *src_key = NULL; |
35732d01 | 1758 | struct rt6_exception_bucket *bucket; |
35732d01 | 1759 | struct rt6_exception *rt6_ex; |
193f3685 | 1760 | |
cc5c073a | 1761 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); |
35732d01 | 1762 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1763 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1764 | * and exception table is indexed by a hash of | |
1765 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1766 | * Otherwise, the exception table is indexed by |
1767 | * a hash of only rt6i_dst. | |
1768 | */ | |
c0b220cf | 1769 | if (plen) |
35732d01 WW |
1770 | src_key = &rt->rt6i_src.addr; |
1771 | #endif | |
cc5c073a | 1772 | rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key); |
35732d01 WW |
1773 | if (rt6_ex) |
1774 | rt6_ex->stamp = jiffies; | |
c0b220cf DA |
1775 | } |
1776 | ||
1777 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) | |
1778 | { | |
1779 | struct fib6_info *from; | |
35732d01 | 1780 | |
c0b220cf DA |
1781 | rcu_read_lock(); |
1782 | ||
1783 | from = rcu_dereference(rt->from); | |
1784 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) | |
1785 | goto unlock; | |
1786 | ||
1cf844c7 | 1787 | fib6_nh_update_exception(from->fib6_nh, from->fib6_src.plen, rt); |
193f3685 | 1788 | unlock: |
35732d01 WW |
1789 | rcu_read_unlock(); |
1790 | } | |
1791 | ||
e9fa1495 SB |
1792 | static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev, |
1793 | struct rt6_info *rt, int mtu) | |
1794 | { | |
1795 | /* If the new MTU is lower than the route PMTU, this new MTU will be the | |
1796 | * lowest MTU in the path: always allow updating the route PMTU to | |
1797 | * reflect PMTU decreases. | |
1798 | * | |
1799 | * If the new MTU is higher, and the route PMTU is equal to the local | |
1800 | * MTU, this means the old MTU is the lowest in the path, so allow | |
1801 | * updating it: if other nodes now have lower MTUs, PMTU discovery will | |
1802 | * handle this. | |
1803 | */ | |
1804 | ||
1805 | if (dst_mtu(&rt->dst) >= mtu) | |
1806 | return true; | |
1807 | ||
1808 | if (dst_mtu(&rt->dst) == idev->cnf.mtu6) | |
1809 | return true; | |
1810 | ||
1811 | return false; | |
1812 | } | |
1813 | ||
1814 | static void rt6_exceptions_update_pmtu(struct inet6_dev *idev, | |
cc5c073a | 1815 | const struct fib6_nh *nh, int mtu) |
f5bbe7ee WW |
1816 | { |
1817 | struct rt6_exception_bucket *bucket; | |
1818 | struct rt6_exception *rt6_ex; | |
1819 | int i; | |
1820 | ||
cc5c073a | 1821 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
e9fa1495 SB |
1822 | if (!bucket) |
1823 | return; | |
1824 | ||
1825 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1826 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1827 | struct rt6_info *entry = rt6_ex->rt6i; | |
1828 | ||
1829 | /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected | |
d4ead6b3 | 1830 | * route), the metrics of its rt->from have already |
e9fa1495 SB |
1831 | * been updated. |
1832 | */ | |
d4ead6b3 | 1833 | if (dst_metric_raw(&entry->dst, RTAX_MTU) && |
e9fa1495 | 1834 | rt6_mtu_change_route_allowed(idev, entry, mtu)) |
d4ead6b3 | 1835 | dst_metric_set(&entry->dst, RTAX_MTU, mtu); |
f5bbe7ee | 1836 | } |
e9fa1495 | 1837 | bucket++; |
f5bbe7ee WW |
1838 | } |
1839 | } | |
1840 | ||
b16cb459 WW |
1841 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
1842 | ||
cc5c073a DA |
1843 | static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh, |
1844 | const struct in6_addr *gateway) | |
b16cb459 WW |
1845 | { |
1846 | struct rt6_exception_bucket *bucket; | |
1847 | struct rt6_exception *rt6_ex; | |
1848 | struct hlist_node *tmp; | |
1849 | int i; | |
1850 | ||
cc5c073a | 1851 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
b16cb459 WW |
1852 | return; |
1853 | ||
1854 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 1855 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
b16cb459 WW |
1856 | if (bucket) { |
1857 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1858 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
1859 | &bucket->chain, hlist) { | |
1860 | struct rt6_info *entry = rt6_ex->rt6i; | |
1861 | ||
1862 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
1863 | RTF_CACHE_GATEWAY && | |
1864 | ipv6_addr_equal(gateway, | |
1865 | &entry->rt6i_gateway)) { | |
1866 | rt6_remove_exception(bucket, rt6_ex); | |
1867 | } | |
1868 | } | |
1869 | bucket++; | |
1870 | } | |
1871 | } | |
1872 | ||
1873 | spin_unlock_bh(&rt6_exception_lock); | |
1874 | } | |
1875 | ||
c757faa8 WW |
1876 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
1877 | struct rt6_exception *rt6_ex, | |
1878 | struct fib6_gc_args *gc_args, | |
1879 | unsigned long now) | |
1880 | { | |
1881 | struct rt6_info *rt = rt6_ex->rt6i; | |
1882 | ||
1859bac0 PA |
1883 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
1884 | * even if others have still references to them, so that on next | |
1885 | * dst_check() such references can be dropped. | |
1886 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
1887 | * expired, independently from their aging, as per RFC 8201 section 4 | |
1888 | */ | |
31afeb42 WW |
1889 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
1890 | if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { | |
1891 | RT6_TRACE("aging clone %p\n", rt); | |
1892 | rt6_remove_exception(bucket, rt6_ex); | |
1893 | return; | |
1894 | } | |
1895 | } else if (time_after(jiffies, rt->dst.expires)) { | |
1896 | RT6_TRACE("purging expired route %p\n", rt); | |
c757faa8 WW |
1897 | rt6_remove_exception(bucket, rt6_ex); |
1898 | return; | |
31afeb42 WW |
1899 | } |
1900 | ||
1901 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
c757faa8 WW |
1902 | struct neighbour *neigh; |
1903 | __u8 neigh_flags = 0; | |
1904 | ||
1bfa26ff ED |
1905 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
1906 | if (neigh) | |
c757faa8 | 1907 | neigh_flags = neigh->flags; |
1bfa26ff | 1908 | |
c757faa8 WW |
1909 | if (!(neigh_flags & NTF_ROUTER)) { |
1910 | RT6_TRACE("purging route %p via non-router but gateway\n", | |
1911 | rt); | |
1912 | rt6_remove_exception(bucket, rt6_ex); | |
1913 | return; | |
1914 | } | |
1915 | } | |
31afeb42 | 1916 | |
c757faa8 WW |
1917 | gc_args->more++; |
1918 | } | |
1919 | ||
cc5c073a | 1920 | static void fib6_nh_age_exceptions(const struct fib6_nh *nh, |
c0b220cf DA |
1921 | struct fib6_gc_args *gc_args, |
1922 | unsigned long now) | |
c757faa8 WW |
1923 | { |
1924 | struct rt6_exception_bucket *bucket; | |
1925 | struct rt6_exception *rt6_ex; | |
1926 | struct hlist_node *tmp; | |
1927 | int i; | |
1928 | ||
cc5c073a | 1929 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
c757faa8 WW |
1930 | return; |
1931 | ||
1bfa26ff ED |
1932 | rcu_read_lock_bh(); |
1933 | spin_lock(&rt6_exception_lock); | |
cc5c073a | 1934 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
c757faa8 WW |
1935 | if (bucket) { |
1936 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1937 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
1938 | &bucket->chain, hlist) { | |
1939 | rt6_age_examine_exception(bucket, rt6_ex, | |
1940 | gc_args, now); | |
1941 | } | |
1942 | bucket++; | |
1943 | } | |
1944 | } | |
1bfa26ff ED |
1945 | spin_unlock(&rt6_exception_lock); |
1946 | rcu_read_unlock_bh(); | |
c757faa8 WW |
1947 | } |
1948 | ||
cc5c073a | 1949 | void rt6_age_exceptions(struct fib6_info *f6i, |
c0b220cf DA |
1950 | struct fib6_gc_args *gc_args, |
1951 | unsigned long now) | |
1952 | { | |
1cf844c7 | 1953 | fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now); |
c0b220cf DA |
1954 | } |
1955 | ||
1d053da9 | 1956 | /* must be called with rcu lock held */ |
effda4dd DA |
1957 | int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif, |
1958 | struct flowi6 *fl6, struct fib6_result *res, int strict) | |
1da177e4 | 1959 | { |
367efcb9 | 1960 | struct fib6_node *fn, *saved_fn; |
1da177e4 | 1961 | |
6454743b | 1962 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1963 | saved_fn = fn; |
1da177e4 | 1964 | |
ca254490 DA |
1965 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1966 | oif = 0; | |
1967 | ||
a3c00e46 | 1968 | redo_rt6_select: |
effda4dd DA |
1969 | rt6_select(net, fn, oif, res, strict); |
1970 | if (res->f6i == net->ipv6.fib6_null_entry) { | |
a3c00e46 MKL |
1971 | fn = fib6_backtrack(fn, &fl6->saddr); |
1972 | if (fn) | |
1973 | goto redo_rt6_select; | |
367efcb9 MKL |
1974 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1975 | /* also consider unreachable route */ | |
1976 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1977 | fn = saved_fn; | |
1978 | goto redo_rt6_select; | |
367efcb9 | 1979 | } |
a3c00e46 MKL |
1980 | } |
1981 | ||
effda4dd | 1982 | trace_fib6_table_lookup(net, res, table, fl6); |
fb9de91e | 1983 | |
effda4dd | 1984 | return 0; |
1d053da9 DA |
1985 | } |
1986 | ||
1987 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, | |
1988 | int oif, struct flowi6 *fl6, | |
1989 | const struct sk_buff *skb, int flags) | |
1990 | { | |
b1d40991 | 1991 | struct fib6_result res = {}; |
1d053da9 DA |
1992 | struct rt6_info *rt; |
1993 | int strict = 0; | |
1994 | ||
1995 | strict |= flags & RT6_LOOKUP_F_IFACE; | |
1996 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; | |
1997 | if (net->ipv6.devconf_all->forwarding == 0) | |
1998 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1999 | ||
2000 | rcu_read_lock(); | |
2001 | ||
effda4dd | 2002 | fib6_table_lookup(net, table, oif, fl6, &res, strict); |
b1d40991 | 2003 | if (res.f6i == net->ipv6.fib6_null_entry) { |
421842ed | 2004 | rt = net->ipv6.ip6_null_entry; |
66f5d6ce | 2005 | rcu_read_unlock(); |
d3843fe5 | 2006 | dst_hold(&rt->dst); |
d3843fe5 | 2007 | return rt; |
23fb93a4 DA |
2008 | } |
2009 | ||
b1d40991 | 2010 | fib6_select_path(net, &res, fl6, oif, false, skb, strict); |
d83009d4 | 2011 | |
23fb93a4 | 2012 | /*Search through exception table */ |
7e4b5128 | 2013 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 2014 | if (rt) { |
10585b43 | 2015 | if (ip6_hold_safe(net, &rt)) |
d3843fe5 | 2016 | dst_use_noref(&rt->dst, jiffies); |
d4ead6b3 | 2017 | |
66f5d6ce | 2018 | rcu_read_unlock(); |
d52d3997 | 2019 | return rt; |
3da59bd9 | 2020 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
b1d40991 | 2021 | !res.nh->fib_nh_gw_family)) { |
3da59bd9 MKL |
2022 | /* Create a RTF_CACHE clone which will not be |
2023 | * owned by the fib6 tree. It is for the special case where | |
2024 | * the daddr in the skb during the neighbor look-up is different | |
2025 | * from the fl6->daddr used to look-up route here. | |
2026 | */ | |
3da59bd9 MKL |
2027 | struct rt6_info *uncached_rt; |
2028 | ||
85bd05de | 2029 | uncached_rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); |
d52d3997 | 2030 | |
4d85cd0c | 2031 | rcu_read_unlock(); |
c71099ac | 2032 | |
1cfb71ee WW |
2033 | if (uncached_rt) { |
2034 | /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc() | |
2035 | * No need for another dst_hold() | |
2036 | */ | |
8d0b94af | 2037 | rt6_uncached_list_add(uncached_rt); |
81eb8447 | 2038 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1cfb71ee | 2039 | } else { |
3da59bd9 | 2040 | uncached_rt = net->ipv6.ip6_null_entry; |
1cfb71ee WW |
2041 | dst_hold(&uncached_rt->dst); |
2042 | } | |
b811580d | 2043 | |
3da59bd9 | 2044 | return uncached_rt; |
d52d3997 MKL |
2045 | } else { |
2046 | /* Get a percpu copy */ | |
2047 | ||
2048 | struct rt6_info *pcpu_rt; | |
2049 | ||
951f788a | 2050 | local_bh_disable(); |
db3fedee | 2051 | pcpu_rt = rt6_get_pcpu_route(&res); |
d52d3997 | 2052 | |
93531c67 | 2053 | if (!pcpu_rt) |
db3fedee | 2054 | pcpu_rt = rt6_make_pcpu_route(net, &res); |
93531c67 | 2055 | |
951f788a ED |
2056 | local_bh_enable(); |
2057 | rcu_read_unlock(); | |
d4bea421 | 2058 | |
d52d3997 MKL |
2059 | return pcpu_rt; |
2060 | } | |
1da177e4 | 2061 | } |
9ff74384 | 2062 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 2063 | |
b75cc8f9 DA |
2064 | static struct rt6_info *ip6_pol_route_input(struct net *net, |
2065 | struct fib6_table *table, | |
2066 | struct flowi6 *fl6, | |
2067 | const struct sk_buff *skb, | |
2068 | int flags) | |
4acad72d | 2069 | { |
b75cc8f9 | 2070 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags); |
4acad72d PE |
2071 | } |
2072 | ||
d409b847 MB |
2073 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
2074 | struct net_device *dev, | |
b75cc8f9 DA |
2075 | struct flowi6 *fl6, |
2076 | const struct sk_buff *skb, | |
2077 | int flags) | |
72331bc0 SL |
2078 | { |
2079 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
2080 | flags |= RT6_LOOKUP_F_IFACE; | |
2081 | ||
b75cc8f9 | 2082 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input); |
72331bc0 | 2083 | } |
d409b847 | 2084 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 2085 | |
23aebdac | 2086 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
5e5d6fed RP |
2087 | struct flow_keys *keys, |
2088 | struct flow_keys *flkeys) | |
23aebdac JS |
2089 | { |
2090 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
2091 | const struct ipv6hdr *key_iph = outer_iph; | |
5e5d6fed | 2092 | struct flow_keys *_flkeys = flkeys; |
23aebdac JS |
2093 | const struct ipv6hdr *inner_iph; |
2094 | const struct icmp6hdr *icmph; | |
2095 | struct ipv6hdr _inner_iph; | |
cea67a2d | 2096 | struct icmp6hdr _icmph; |
23aebdac JS |
2097 | |
2098 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
2099 | goto out; | |
2100 | ||
cea67a2d ED |
2101 | icmph = skb_header_pointer(skb, skb_transport_offset(skb), |
2102 | sizeof(_icmph), &_icmph); | |
2103 | if (!icmph) | |
2104 | goto out; | |
2105 | ||
23aebdac JS |
2106 | if (icmph->icmp6_type != ICMPV6_DEST_UNREACH && |
2107 | icmph->icmp6_type != ICMPV6_PKT_TOOBIG && | |
2108 | icmph->icmp6_type != ICMPV6_TIME_EXCEED && | |
2109 | icmph->icmp6_type != ICMPV6_PARAMPROB) | |
2110 | goto out; | |
2111 | ||
2112 | inner_iph = skb_header_pointer(skb, | |
2113 | skb_transport_offset(skb) + sizeof(*icmph), | |
2114 | sizeof(_inner_iph), &_inner_iph); | |
2115 | if (!inner_iph) | |
2116 | goto out; | |
2117 | ||
2118 | key_iph = inner_iph; | |
5e5d6fed | 2119 | _flkeys = NULL; |
23aebdac | 2120 | out: |
5e5d6fed RP |
2121 | if (_flkeys) { |
2122 | keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src; | |
2123 | keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst; | |
2124 | keys->tags.flow_label = _flkeys->tags.flow_label; | |
2125 | keys->basic.ip_proto = _flkeys->basic.ip_proto; | |
2126 | } else { | |
2127 | keys->addrs.v6addrs.src = key_iph->saddr; | |
2128 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
fa1be7e0 | 2129 | keys->tags.flow_label = ip6_flowlabel(key_iph); |
5e5d6fed RP |
2130 | keys->basic.ip_proto = key_iph->nexthdr; |
2131 | } | |
23aebdac JS |
2132 | } |
2133 | ||
2134 | /* if skb is set it will be used and fl6 can be NULL */ | |
b4bac172 DA |
2135 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
2136 | const struct sk_buff *skb, struct flow_keys *flkeys) | |
23aebdac JS |
2137 | { |
2138 | struct flow_keys hash_keys; | |
9a2a537a | 2139 | u32 mhash; |
23aebdac | 2140 | |
bbfa047a | 2141 | switch (ip6_multipath_hash_policy(net)) { |
b4bac172 DA |
2142 | case 0: |
2143 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2144 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2145 | if (skb) { | |
2146 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2147 | } else { | |
2148 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2149 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
fa1be7e0 | 2150 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
b4bac172 DA |
2151 | hash_keys.basic.ip_proto = fl6->flowi6_proto; |
2152 | } | |
2153 | break; | |
2154 | case 1: | |
2155 | if (skb) { | |
2156 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2157 | struct flow_keys keys; | |
2158 | ||
2159 | /* short-circuit if we already have L4 hash present */ | |
2160 | if (skb->l4_hash) | |
2161 | return skb_get_hash_raw(skb) >> 1; | |
2162 | ||
2163 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2164 | ||
2165 | if (!flkeys) { | |
2166 | skb_flow_dissect_flow_keys(skb, &keys, flag); | |
2167 | flkeys = &keys; | |
2168 | } | |
2169 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2170 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2171 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2172 | hash_keys.ports.src = flkeys->ports.src; | |
2173 | hash_keys.ports.dst = flkeys->ports.dst; | |
2174 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2175 | } else { | |
2176 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2177 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2178 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2179 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2180 | hash_keys.ports.src = fl6->fl6_sport; | |
2181 | hash_keys.ports.dst = fl6->fl6_dport; | |
2182 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2183 | } | |
2184 | break; | |
23aebdac | 2185 | } |
9a2a537a | 2186 | mhash = flow_hash_from_keys(&hash_keys); |
23aebdac | 2187 | |
9a2a537a | 2188 | return mhash >> 1; |
23aebdac JS |
2189 | } |
2190 | ||
c71099ac TG |
2191 | void ip6_route_input(struct sk_buff *skb) |
2192 | { | |
b71d1d42 | 2193 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 2194 | struct net *net = dev_net(skb->dev); |
adaa70bb | 2195 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 2196 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 2197 | struct flowi6 fl6 = { |
e0d56fdd | 2198 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
2199 | .daddr = iph->daddr, |
2200 | .saddr = iph->saddr, | |
6502ca52 | 2201 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
2202 | .flowi6_mark = skb->mark, |
2203 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 2204 | }; |
5e5d6fed | 2205 | struct flow_keys *flkeys = NULL, _flkeys; |
adaa70bb | 2206 | |
904af04d | 2207 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2208 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 2209 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
5e5d6fed RP |
2210 | |
2211 | if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys)) | |
2212 | flkeys = &_flkeys; | |
2213 | ||
23aebdac | 2214 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
b4bac172 | 2215 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys); |
06e9d040 | 2216 | skb_dst_drop(skb); |
b75cc8f9 DA |
2217 | skb_dst_set(skb, |
2218 | ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags)); | |
c71099ac TG |
2219 | } |
2220 | ||
b75cc8f9 DA |
2221 | static struct rt6_info *ip6_pol_route_output(struct net *net, |
2222 | struct fib6_table *table, | |
2223 | struct flowi6 *fl6, | |
2224 | const struct sk_buff *skb, | |
2225 | int flags) | |
1da177e4 | 2226 | { |
b75cc8f9 | 2227 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags); |
c71099ac TG |
2228 | } |
2229 | ||
6f21c96a PA |
2230 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
2231 | struct flowi6 *fl6, int flags) | |
c71099ac | 2232 | { |
d46a9d67 | 2233 | bool any_src; |
c71099ac | 2234 | |
3ede0bbc RS |
2235 | if (ipv6_addr_type(&fl6->daddr) & |
2236 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) { | |
4c1feac5 DA |
2237 | struct dst_entry *dst; |
2238 | ||
2239 | dst = l3mdev_link_scope_lookup(net, fl6); | |
2240 | if (dst) | |
2241 | return dst; | |
2242 | } | |
ca254490 | 2243 | |
1fb9489b | 2244 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 2245 | |
d46a9d67 | 2246 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 2247 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 2248 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 2249 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 2250 | |
d46a9d67 | 2251 | if (!any_src) |
adaa70bb | 2252 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
2253 | else if (sk) |
2254 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 2255 | |
b75cc8f9 | 2256 | return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output); |
1da177e4 | 2257 | } |
6f21c96a | 2258 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 2259 | |
2774c131 | 2260 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2261 | { |
5c1e6aa3 | 2262 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 2263 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
2264 | struct dst_entry *new = NULL; |
2265 | ||
1dbe3252 | 2266 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 2267 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2268 | if (rt) { |
0a1f5962 | 2269 | rt6_info_init(rt); |
81eb8447 | 2270 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 2271 | |
0a1f5962 | 2272 | new = &rt->dst; |
14e50e57 | 2273 | new->__use = 1; |
352e512c | 2274 | new->input = dst_discard; |
ede2059d | 2275 | new->output = dst_discard_out; |
14e50e57 | 2276 | |
0a1f5962 | 2277 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2278 | |
1dbe3252 | 2279 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 2280 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 2281 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
2282 | |
2283 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
2284 | #ifdef CONFIG_IPV6_SUBTREES | |
2285 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
2286 | #endif | |
14e50e57 DM |
2287 | } |
2288 | ||
69ead7af DM |
2289 | dst_release(dst_orig); |
2290 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 2291 | } |
14e50e57 | 2292 | |
1da177e4 LT |
2293 | /* |
2294 | * Destination cache support functions | |
2295 | */ | |
2296 | ||
8d1c802b | 2297 | static bool fib6_check(struct fib6_info *f6i, u32 cookie) |
4b32b5ad | 2298 | { |
93531c67 DA |
2299 | u32 rt_cookie = 0; |
2300 | ||
8ae86971 | 2301 | if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie) |
93531c67 DA |
2302 | return false; |
2303 | ||
2304 | if (fib6_check_expired(f6i)) | |
2305 | return false; | |
2306 | ||
2307 | return true; | |
4b32b5ad MKL |
2308 | } |
2309 | ||
a68886a6 DA |
2310 | static struct dst_entry *rt6_check(struct rt6_info *rt, |
2311 | struct fib6_info *from, | |
2312 | u32 cookie) | |
3da59bd9 | 2313 | { |
36143645 | 2314 | u32 rt_cookie = 0; |
c5cff856 | 2315 | |
a68886a6 | 2316 | if ((from && !fib6_get_cookie_safe(from, &rt_cookie)) || |
93531c67 | 2317 | rt_cookie != cookie) |
3da59bd9 MKL |
2318 | return NULL; |
2319 | ||
2320 | if (rt6_check_expired(rt)) | |
2321 | return NULL; | |
2322 | ||
2323 | return &rt->dst; | |
2324 | } | |
2325 | ||
a68886a6 DA |
2326 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, |
2327 | struct fib6_info *from, | |
2328 | u32 cookie) | |
3da59bd9 | 2329 | { |
5973fb1e MKL |
2330 | if (!__rt6_check_expired(rt) && |
2331 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
a68886a6 | 2332 | fib6_check(from, cookie)) |
3da59bd9 MKL |
2333 | return &rt->dst; |
2334 | else | |
2335 | return NULL; | |
2336 | } | |
2337 | ||
1da177e4 LT |
2338 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
2339 | { | |
a87b7dc9 | 2340 | struct dst_entry *dst_ret; |
a68886a6 | 2341 | struct fib6_info *from; |
1da177e4 LT |
2342 | struct rt6_info *rt; |
2343 | ||
a87b7dc9 DA |
2344 | rt = container_of(dst, struct rt6_info, dst); |
2345 | ||
2346 | rcu_read_lock(); | |
1da177e4 | 2347 | |
6f3118b5 ND |
2348 | /* All IPV6 dsts are created with ->obsolete set to the value |
2349 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
2350 | * into this function always. | |
2351 | */ | |
e3bc10bd | 2352 | |
a68886a6 | 2353 | from = rcu_dereference(rt->from); |
4b32b5ad | 2354 | |
a68886a6 DA |
2355 | if (from && (rt->rt6i_flags & RTF_PCPU || |
2356 | unlikely(!list_empty(&rt->rt6i_uncached)))) | |
2357 | dst_ret = rt6_dst_from_check(rt, from, cookie); | |
3da59bd9 | 2358 | else |
a68886a6 | 2359 | dst_ret = rt6_check(rt, from, cookie); |
a87b7dc9 DA |
2360 | |
2361 | rcu_read_unlock(); | |
2362 | ||
2363 | return dst_ret; | |
1da177e4 LT |
2364 | } |
2365 | ||
2366 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
2367 | { | |
2368 | struct rt6_info *rt = (struct rt6_info *) dst; | |
2369 | ||
2370 | if (rt) { | |
54c1a859 | 2371 | if (rt->rt6i_flags & RTF_CACHE) { |
c3c14da0 | 2372 | rcu_read_lock(); |
54c1a859 | 2373 | if (rt6_check_expired(rt)) { |
93531c67 | 2374 | rt6_remove_exception_rt(rt); |
54c1a859 YH |
2375 | dst = NULL; |
2376 | } | |
c3c14da0 | 2377 | rcu_read_unlock(); |
54c1a859 | 2378 | } else { |
1da177e4 | 2379 | dst_release(dst); |
54c1a859 YH |
2380 | dst = NULL; |
2381 | } | |
1da177e4 | 2382 | } |
54c1a859 | 2383 | return dst; |
1da177e4 LT |
2384 | } |
2385 | ||
2386 | static void ip6_link_failure(struct sk_buff *skb) | |
2387 | { | |
2388 | struct rt6_info *rt; | |
2389 | ||
3ffe533c | 2390 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2391 | |
adf30907 | 2392 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2393 | if (rt) { |
8a14e46f | 2394 | rcu_read_lock(); |
1eb4f758 | 2395 | if (rt->rt6i_flags & RTF_CACHE) { |
761f6026 | 2396 | rt6_remove_exception_rt(rt); |
c5cff856 | 2397 | } else { |
a68886a6 | 2398 | struct fib6_info *from; |
c5cff856 WW |
2399 | struct fib6_node *fn; |
2400 | ||
a68886a6 DA |
2401 | from = rcu_dereference(rt->from); |
2402 | if (from) { | |
2403 | fn = rcu_dereference(from->fib6_node); | |
2404 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
2405 | fn->fn_sernum = -1; | |
2406 | } | |
1eb4f758 | 2407 | } |
8a14e46f | 2408 | rcu_read_unlock(); |
1da177e4 LT |
2409 | } |
2410 | } | |
2411 | ||
6a3e030f DA |
2412 | static void rt6_update_expires(struct rt6_info *rt0, int timeout) |
2413 | { | |
a68886a6 DA |
2414 | if (!(rt0->rt6i_flags & RTF_EXPIRES)) { |
2415 | struct fib6_info *from; | |
2416 | ||
2417 | rcu_read_lock(); | |
2418 | from = rcu_dereference(rt0->from); | |
2419 | if (from) | |
2420 | rt0->dst.expires = from->expires; | |
2421 | rcu_read_unlock(); | |
2422 | } | |
6a3e030f DA |
2423 | |
2424 | dst_set_expires(&rt0->dst, timeout); | |
2425 | rt0->rt6i_flags |= RTF_EXPIRES; | |
2426 | } | |
2427 | ||
45e4fd26 MKL |
2428 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2429 | { | |
2430 | struct net *net = dev_net(rt->dst.dev); | |
2431 | ||
d4ead6b3 | 2432 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
45e4fd26 | 2433 | rt->rt6i_flags |= RTF_MODIFIED; |
45e4fd26 MKL |
2434 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
2435 | } | |
2436 | ||
0d3f6d29 MKL |
2437 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2438 | { | |
2439 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1490ed2a | 2440 | (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from)); |
0d3f6d29 MKL |
2441 | } |
2442 | ||
45e4fd26 MKL |
2443 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
2444 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 2445 | { |
0dec879f | 2446 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2447 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2448 | |
19bda36c XL |
2449 | if (dst_metric_locked(dst, RTAX_MTU)) |
2450 | return; | |
2451 | ||
0dec879f JA |
2452 | if (iph) { |
2453 | daddr = &iph->daddr; | |
2454 | saddr = &iph->saddr; | |
2455 | } else if (sk) { | |
2456 | daddr = &sk->sk_v6_daddr; | |
2457 | saddr = &inet6_sk(sk)->saddr; | |
2458 | } else { | |
2459 | daddr = NULL; | |
2460 | saddr = NULL; | |
2461 | } | |
2462 | dst_confirm_neigh(dst, daddr); | |
45e4fd26 MKL |
2463 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
2464 | if (mtu >= dst_mtu(dst)) | |
2465 | return; | |
9d289715 | 2466 | |
0d3f6d29 | 2467 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2468 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2469 | /* update rt6_ex->stamp for cache */ |
2470 | if (rt6->rt6i_flags & RTF_CACHE) | |
2471 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2472 | } else if (daddr) { |
85bd05de | 2473 | struct fib6_result res = {}; |
45e4fd26 MKL |
2474 | struct rt6_info *nrt6; |
2475 | ||
4d85cd0c | 2476 | rcu_read_lock(); |
85bd05de DA |
2477 | res.f6i = rcu_dereference(rt6->from); |
2478 | if (!res.f6i) { | |
9c69a132 JL |
2479 | rcu_read_unlock(); |
2480 | return; | |
2481 | } | |
1cf844c7 | 2482 | res.nh = res.f6i->fib6_nh; |
7d21fec9 DA |
2483 | res.fib6_flags = res.f6i->fib6_flags; |
2484 | res.fib6_type = res.f6i->fib6_type; | |
2485 | ||
85bd05de | 2486 | nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); |
45e4fd26 MKL |
2487 | if (nrt6) { |
2488 | rt6_do_update_pmtu(nrt6, mtu); | |
5012f0a5 | 2489 | if (rt6_insert_exception(nrt6, &res)) |
2b760fcf | 2490 | dst_release_immediate(&nrt6->dst); |
45e4fd26 | 2491 | } |
a68886a6 | 2492 | rcu_read_unlock(); |
1da177e4 LT |
2493 | } |
2494 | } | |
2495 | ||
45e4fd26 MKL |
2496 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2497 | struct sk_buff *skb, u32 mtu) | |
2498 | { | |
2499 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
2500 | } | |
2501 | ||
42ae66c8 | 2502 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2503 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2504 | { |
2505 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2506 | struct dst_entry *dst; | |
dc92095d MŻ |
2507 | struct flowi6 fl6 = { |
2508 | .flowi6_oif = oif, | |
2509 | .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark), | |
2510 | .daddr = iph->daddr, | |
2511 | .saddr = iph->saddr, | |
2512 | .flowlabel = ip6_flowinfo(iph), | |
2513 | .flowi6_uid = uid, | |
2514 | }; | |
81aded24 DM |
2515 | |
2516 | dst = ip6_route_output(net, NULL, &fl6); | |
2517 | if (!dst->error) | |
45e4fd26 | 2518 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
2519 | dst_release(dst); |
2520 | } | |
2521 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2522 | ||
2523 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2524 | { | |
7ddacfa5 | 2525 | int oif = sk->sk_bound_dev_if; |
33c162a9 MKL |
2526 | struct dst_entry *dst; |
2527 | ||
7ddacfa5 DA |
2528 | if (!oif && skb->dev) |
2529 | oif = l3mdev_master_ifindex(skb->dev); | |
2530 | ||
2531 | ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid); | |
33c162a9 MKL |
2532 | |
2533 | dst = __sk_dst_get(sk); | |
2534 | if (!dst || !dst->obsolete || | |
2535 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2536 | return; | |
2537 | ||
2538 | bh_lock_sock(sk); | |
2539 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2540 | ip6_datagram_dst_update(sk, false); | |
2541 | bh_unlock_sock(sk); | |
81aded24 DM |
2542 | } |
2543 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2544 | ||
7d6850f7 AK |
2545 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
2546 | const struct flowi6 *fl6) | |
2547 | { | |
2548 | #ifdef CONFIG_IPV6_SUBTREES | |
2549 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2550 | #endif | |
2551 | ||
2552 | ip6_dst_store(sk, dst, | |
2553 | ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? | |
2554 | &sk->sk_v6_daddr : NULL, | |
2555 | #ifdef CONFIG_IPV6_SUBTREES | |
2556 | ipv6_addr_equal(&fl6->saddr, &np->saddr) ? | |
2557 | &np->saddr : | |
2558 | #endif | |
2559 | NULL); | |
2560 | } | |
2561 | ||
9b6b35ab | 2562 | static bool ip6_redirect_nh_match(const struct fib6_result *res, |
0b34eb00 DA |
2563 | struct flowi6 *fl6, |
2564 | const struct in6_addr *gw, | |
2565 | struct rt6_info **ret) | |
2566 | { | |
9b6b35ab DA |
2567 | const struct fib6_nh *nh = res->nh; |
2568 | ||
0b34eb00 DA |
2569 | if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family || |
2570 | fl6->flowi6_oif != nh->fib_nh_dev->ifindex) | |
2571 | return false; | |
2572 | ||
2573 | /* rt_cache's gateway might be different from its 'parent' | |
2574 | * in the case of an ip redirect. | |
2575 | * So we keep searching in the exception table if the gateway | |
2576 | * is different. | |
2577 | */ | |
2578 | if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) { | |
2579 | struct rt6_info *rt_cache; | |
2580 | ||
9b6b35ab | 2581 | rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr); |
0b34eb00 DA |
2582 | if (rt_cache && |
2583 | ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) { | |
2584 | *ret = rt_cache; | |
2585 | return true; | |
2586 | } | |
2587 | return false; | |
2588 | } | |
2589 | return true; | |
2590 | } | |
2591 | ||
b55b76b2 DJ |
2592 | /* Handle redirects */ |
2593 | struct ip6rd_flowi { | |
2594 | struct flowi6 fl6; | |
2595 | struct in6_addr gateway; | |
2596 | }; | |
2597 | ||
2598 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
2599 | struct fib6_table *table, | |
2600 | struct flowi6 *fl6, | |
b75cc8f9 | 2601 | const struct sk_buff *skb, |
b55b76b2 DJ |
2602 | int flags) |
2603 | { | |
2604 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
0b34eb00 | 2605 | struct rt6_info *ret = NULL; |
9b6b35ab | 2606 | struct fib6_result res = {}; |
8d1c802b | 2607 | struct fib6_info *rt; |
b55b76b2 DJ |
2608 | struct fib6_node *fn; |
2609 | ||
31680ac2 DA |
2610 | /* l3mdev_update_flow overrides oif if the device is enslaved; in |
2611 | * this case we must match on the real ingress device, so reset it | |
2612 | */ | |
2613 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) | |
2614 | fl6->flowi6_oif = skb->dev->ifindex; | |
2615 | ||
b55b76b2 | 2616 | /* Get the "current" route for this destination and |
67c408cf | 2617 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
2618 | * |
2619 | * RFC 4861 specifies that redirects should only be | |
2620 | * accepted if they come from the nexthop to the target. | |
2621 | * Due to the way the routes are chosen, this notion | |
2622 | * is a bit fuzzy and one might need to check all possible | |
2623 | * routes. | |
2624 | */ | |
2625 | ||
66f5d6ce | 2626 | rcu_read_lock(); |
6454743b | 2627 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
b55b76b2 | 2628 | restart: |
66f5d6ce | 2629 | for_each_fib6_node_rt_rcu(fn) { |
9b6b35ab | 2630 | res.f6i = rt; |
1cf844c7 | 2631 | res.nh = rt->fib6_nh; |
9b6b35ab | 2632 | |
14895687 | 2633 | if (fib6_check_expired(rt)) |
b55b76b2 | 2634 | continue; |
93c2fb25 | 2635 | if (rt->fib6_flags & RTF_REJECT) |
b55b76b2 | 2636 | break; |
9b6b35ab | 2637 | if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, &ret)) |
0b34eb00 | 2638 | goto out; |
b55b76b2 DJ |
2639 | } |
2640 | ||
2641 | if (!rt) | |
421842ed | 2642 | rt = net->ipv6.fib6_null_entry; |
93c2fb25 | 2643 | else if (rt->fib6_flags & RTF_REJECT) { |
23fb93a4 | 2644 | ret = net->ipv6.ip6_null_entry; |
b0a1ba59 MKL |
2645 | goto out; |
2646 | } | |
2647 | ||
421842ed | 2648 | if (rt == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
2649 | fn = fib6_backtrack(fn, &fl6->saddr); |
2650 | if (fn) | |
2651 | goto restart; | |
b55b76b2 | 2652 | } |
a3c00e46 | 2653 | |
9b6b35ab | 2654 | res.f6i = rt; |
1cf844c7 | 2655 | res.nh = rt->fib6_nh; |
b0a1ba59 | 2656 | out: |
7d21fec9 | 2657 | if (ret) { |
10585b43 | 2658 | ip6_hold_safe(net, &ret); |
7d21fec9 DA |
2659 | } else { |
2660 | res.fib6_flags = res.f6i->fib6_flags; | |
2661 | res.fib6_type = res.f6i->fib6_type; | |
9b6b35ab | 2662 | ret = ip6_create_rt_rcu(&res); |
7d21fec9 | 2663 | } |
b55b76b2 | 2664 | |
66f5d6ce | 2665 | rcu_read_unlock(); |
b55b76b2 | 2666 | |
8ff2e5b2 | 2667 | trace_fib6_table_lookup(net, &res, table, fl6); |
23fb93a4 | 2668 | return ret; |
b55b76b2 DJ |
2669 | }; |
2670 | ||
2671 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
b75cc8f9 DA |
2672 | const struct flowi6 *fl6, |
2673 | const struct sk_buff *skb, | |
2674 | const struct in6_addr *gateway) | |
b55b76b2 DJ |
2675 | { |
2676 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
2677 | struct ip6rd_flowi rdfl; | |
2678 | ||
2679 | rdfl.fl6 = *fl6; | |
2680 | rdfl.gateway = *gateway; | |
2681 | ||
b75cc8f9 | 2682 | return fib6_rule_lookup(net, &rdfl.fl6, skb, |
b55b76b2 DJ |
2683 | flags, __ip6_route_redirect); |
2684 | } | |
2685 | ||
e2d118a1 LC |
2686 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
2687 | kuid_t uid) | |
3a5ad2ee DM |
2688 | { |
2689 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2690 | struct dst_entry *dst; | |
1f7f10ac MŻ |
2691 | struct flowi6 fl6 = { |
2692 | .flowi6_iif = LOOPBACK_IFINDEX, | |
2693 | .flowi6_oif = oif, | |
2694 | .flowi6_mark = mark, | |
2695 | .daddr = iph->daddr, | |
2696 | .saddr = iph->saddr, | |
2697 | .flowlabel = ip6_flowinfo(iph), | |
2698 | .flowi6_uid = uid, | |
2699 | }; | |
3a5ad2ee | 2700 | |
b75cc8f9 | 2701 | dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr); |
b55b76b2 | 2702 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
2703 | dst_release(dst); |
2704 | } | |
2705 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
2706 | ||
d456336d | 2707 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif) |
c92a59ec DJ |
2708 | { |
2709 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
2710 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
2711 | struct dst_entry *dst; | |
0b26fb17 MŻ |
2712 | struct flowi6 fl6 = { |
2713 | .flowi6_iif = LOOPBACK_IFINDEX, | |
2714 | .flowi6_oif = oif, | |
0b26fb17 MŻ |
2715 | .daddr = msg->dest, |
2716 | .saddr = iph->daddr, | |
2717 | .flowi6_uid = sock_net_uid(net, NULL), | |
2718 | }; | |
c92a59ec | 2719 | |
b75cc8f9 | 2720 | dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr); |
b55b76b2 | 2721 | rt6_do_redirect(dst, NULL, skb); |
c92a59ec DJ |
2722 | dst_release(dst); |
2723 | } | |
2724 | ||
3a5ad2ee DM |
2725 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
2726 | { | |
e2d118a1 LC |
2727 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
2728 | sk->sk_uid); | |
3a5ad2ee DM |
2729 | } |
2730 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
2731 | ||
0dbaee3b | 2732 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 2733 | { |
0dbaee3b DM |
2734 | struct net_device *dev = dst->dev; |
2735 | unsigned int mtu = dst_mtu(dst); | |
2736 | struct net *net = dev_net(dev); | |
2737 | ||
1da177e4 LT |
2738 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
2739 | ||
5578689a DL |
2740 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
2741 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
2742 | |
2743 | /* | |
1ab1457c YH |
2744 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
2745 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
2746 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
2747 | * rely only on pmtu discovery" |
2748 | */ | |
2749 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
2750 | mtu = IPV6_MAXPLEN; | |
2751 | return mtu; | |
2752 | } | |
2753 | ||
ebb762f2 | 2754 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 2755 | { |
d33e4553 | 2756 | struct inet6_dev *idev; |
d4ead6b3 | 2757 | unsigned int mtu; |
4b32b5ad MKL |
2758 | |
2759 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 2760 | if (mtu) |
30f78d8e | 2761 | goto out; |
618f9bc7 SK |
2762 | |
2763 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
2764 | |
2765 | rcu_read_lock(); | |
2766 | idev = __in6_dev_get(dst->dev); | |
2767 | if (idev) | |
2768 | mtu = idev->cnf.mtu6; | |
2769 | rcu_read_unlock(); | |
2770 | ||
30f78d8e | 2771 | out: |
14972cbd RP |
2772 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
2773 | ||
2774 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
2775 | } |
2776 | ||
901731b8 DA |
2777 | /* MTU selection: |
2778 | * 1. mtu on route is locked - use it | |
2779 | * 2. mtu from nexthop exception | |
2780 | * 3. mtu from egress device | |
2781 | * | |
2782 | * based on ip6_dst_mtu_forward and exception logic of | |
2783 | * rt6_find_cached_rt; called with rcu_read_lock | |
2784 | */ | |
b748f260 DA |
2785 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
2786 | const struct in6_addr *daddr, | |
2787 | const struct in6_addr *saddr) | |
901731b8 | 2788 | { |
b748f260 DA |
2789 | const struct fib6_nh *nh = res->nh; |
2790 | struct fib6_info *f6i = res->f6i; | |
901731b8 | 2791 | struct inet6_dev *idev; |
510e2ced | 2792 | struct rt6_info *rt; |
901731b8 DA |
2793 | u32 mtu = 0; |
2794 | ||
2795 | if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) { | |
2796 | mtu = f6i->fib6_pmtu; | |
2797 | if (mtu) | |
2798 | goto out; | |
2799 | } | |
2800 | ||
510e2ced WW |
2801 | rt = rt6_find_cached_rt(res, daddr, saddr); |
2802 | if (unlikely(rt)) { | |
2803 | mtu = dst_metric_raw(&rt->dst, RTAX_MTU); | |
2804 | } else { | |
b748f260 | 2805 | struct net_device *dev = nh->fib_nh_dev; |
901731b8 DA |
2806 | |
2807 | mtu = IPV6_MIN_MTU; | |
2808 | idev = __in6_dev_get(dev); | |
2809 | if (idev && idev->cnf.mtu6 > mtu) | |
2810 | mtu = idev->cnf.mtu6; | |
2811 | } | |
2812 | ||
2813 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); | |
2814 | out: | |
b748f260 | 2815 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
901731b8 DA |
2816 | } |
2817 | ||
3b00944c | 2818 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 2819 | struct flowi6 *fl6) |
1da177e4 | 2820 | { |
87a11578 | 2821 | struct dst_entry *dst; |
1da177e4 LT |
2822 | struct rt6_info *rt; |
2823 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 2824 | struct net *net = dev_net(dev); |
1da177e4 | 2825 | |
38308473 | 2826 | if (unlikely(!idev)) |
122bdf67 | 2827 | return ERR_PTR(-ENODEV); |
1da177e4 | 2828 | |
ad706862 | 2829 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 2830 | if (unlikely(!rt)) { |
1da177e4 | 2831 | in6_dev_put(idev); |
87a11578 | 2832 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
2833 | goto out; |
2834 | } | |
2835 | ||
8e2ec639 | 2836 | rt->dst.flags |= DST_HOST; |
588753f1 | 2837 | rt->dst.input = ip6_input; |
8e2ec639 | 2838 | rt->dst.output = ip6_output; |
550bab42 | 2839 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 2840 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
2841 | rt->rt6i_dst.plen = 128; |
2842 | rt->rt6i_idev = idev; | |
14edd87d | 2843 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 2844 | |
4c981e28 | 2845 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
2846 | * do proper release of the net_device |
2847 | */ | |
2848 | rt6_uncached_list_add(rt); | |
81eb8447 | 2849 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1da177e4 | 2850 | |
87a11578 DM |
2851 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
2852 | ||
1da177e4 | 2853 | out: |
87a11578 | 2854 | return dst; |
1da177e4 LT |
2855 | } |
2856 | ||
569d3645 | 2857 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 2858 | { |
86393e52 | 2859 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
2860 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
2861 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
2862 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2863 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2864 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 2865 | int entries; |
7019b78e | 2866 | |
fc66f95c | 2867 | entries = dst_entries_get_fast(ops); |
49a18d86 | 2868 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 2869 | entries <= rt_max_size) |
1da177e4 LT |
2870 | goto out; |
2871 | ||
6891a346 | 2872 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 2873 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
2874 | entries = dst_entries_get_slow(ops); |
2875 | if (entries < ops->gc_thresh) | |
7019b78e | 2876 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 2877 | out: |
7019b78e | 2878 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 2879 | return entries > rt_max_size; |
1da177e4 LT |
2880 | } |
2881 | ||
8c14586f DA |
2882 | static struct rt6_info *ip6_nh_lookup_table(struct net *net, |
2883 | struct fib6_config *cfg, | |
f4797b33 DA |
2884 | const struct in6_addr *gw_addr, |
2885 | u32 tbid, int flags) | |
8c14586f DA |
2886 | { |
2887 | struct flowi6 fl6 = { | |
2888 | .flowi6_oif = cfg->fc_ifindex, | |
2889 | .daddr = *gw_addr, | |
2890 | .saddr = cfg->fc_prefsrc, | |
2891 | }; | |
2892 | struct fib6_table *table; | |
2893 | struct rt6_info *rt; | |
8c14586f | 2894 | |
f4797b33 | 2895 | table = fib6_get_table(net, tbid); |
8c14586f DA |
2896 | if (!table) |
2897 | return NULL; | |
2898 | ||
2899 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
2900 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2901 | ||
f4797b33 | 2902 | flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE; |
b75cc8f9 | 2903 | rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, NULL, flags); |
8c14586f DA |
2904 | |
2905 | /* if table lookup failed, fall back to full lookup */ | |
2906 | if (rt == net->ipv6.ip6_null_entry) { | |
2907 | ip6_rt_put(rt); | |
2908 | rt = NULL; | |
2909 | } | |
2910 | ||
2911 | return rt; | |
2912 | } | |
2913 | ||
fc1e64e1 DA |
2914 | static int ip6_route_check_nh_onlink(struct net *net, |
2915 | struct fib6_config *cfg, | |
9fbb704c | 2916 | const struct net_device *dev, |
fc1e64e1 DA |
2917 | struct netlink_ext_ack *extack) |
2918 | { | |
44750f84 | 2919 | u32 tbid = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN; |
fc1e64e1 DA |
2920 | const struct in6_addr *gw_addr = &cfg->fc_gateway; |
2921 | u32 flags = RTF_LOCAL | RTF_ANYCAST | RTF_REJECT; | |
bf1dc8ba | 2922 | struct fib6_info *from; |
fc1e64e1 DA |
2923 | struct rt6_info *grt; |
2924 | int err; | |
2925 | ||
2926 | err = 0; | |
2927 | grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0); | |
2928 | if (grt) { | |
bf1dc8ba PA |
2929 | rcu_read_lock(); |
2930 | from = rcu_dereference(grt->from); | |
58e354c0 | 2931 | if (!grt->dst.error && |
4ed591c8 | 2932 | /* ignore match if it is the default route */ |
bf1dc8ba | 2933 | from && !ipv6_addr_any(&from->fib6_dst.addr) && |
58e354c0 | 2934 | (grt->rt6i_flags & flags || dev != grt->dst.dev)) { |
44750f84 DA |
2935 | NL_SET_ERR_MSG(extack, |
2936 | "Nexthop has invalid gateway or device mismatch"); | |
fc1e64e1 DA |
2937 | err = -EINVAL; |
2938 | } | |
bf1dc8ba | 2939 | rcu_read_unlock(); |
fc1e64e1 DA |
2940 | |
2941 | ip6_rt_put(grt); | |
2942 | } | |
2943 | ||
2944 | return err; | |
2945 | } | |
2946 | ||
1edce99f DA |
2947 | static int ip6_route_check_nh(struct net *net, |
2948 | struct fib6_config *cfg, | |
2949 | struct net_device **_dev, | |
2950 | struct inet6_dev **idev) | |
2951 | { | |
2952 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
2953 | struct net_device *dev = _dev ? *_dev : NULL; | |
2954 | struct rt6_info *grt = NULL; | |
2955 | int err = -EHOSTUNREACH; | |
2956 | ||
2957 | if (cfg->fc_table) { | |
f4797b33 DA |
2958 | int flags = RT6_LOOKUP_F_IFACE; |
2959 | ||
2960 | grt = ip6_nh_lookup_table(net, cfg, gw_addr, | |
2961 | cfg->fc_table, flags); | |
1edce99f DA |
2962 | if (grt) { |
2963 | if (grt->rt6i_flags & RTF_GATEWAY || | |
2964 | (dev && dev != grt->dst.dev)) { | |
2965 | ip6_rt_put(grt); | |
2966 | grt = NULL; | |
2967 | } | |
2968 | } | |
2969 | } | |
2970 | ||
2971 | if (!grt) | |
b75cc8f9 | 2972 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, NULL, 1); |
1edce99f DA |
2973 | |
2974 | if (!grt) | |
2975 | goto out; | |
2976 | ||
2977 | if (dev) { | |
2978 | if (dev != grt->dst.dev) { | |
2979 | ip6_rt_put(grt); | |
2980 | goto out; | |
2981 | } | |
2982 | } else { | |
2983 | *_dev = dev = grt->dst.dev; | |
2984 | *idev = grt->rt6i_idev; | |
2985 | dev_hold(dev); | |
2986 | in6_dev_hold(grt->rt6i_idev); | |
2987 | } | |
2988 | ||
2989 | if (!(grt->rt6i_flags & RTF_GATEWAY)) | |
2990 | err = 0; | |
2991 | ||
2992 | ip6_rt_put(grt); | |
2993 | ||
2994 | out: | |
2995 | return err; | |
2996 | } | |
2997 | ||
9fbb704c DA |
2998 | static int ip6_validate_gw(struct net *net, struct fib6_config *cfg, |
2999 | struct net_device **_dev, struct inet6_dev **idev, | |
3000 | struct netlink_ext_ack *extack) | |
3001 | { | |
3002 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3003 | int gwa_type = ipv6_addr_type(gw_addr); | |
232378e8 | 3004 | bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true; |
9fbb704c | 3005 | const struct net_device *dev = *_dev; |
232378e8 | 3006 | bool need_addr_check = !dev; |
9fbb704c DA |
3007 | int err = -EINVAL; |
3008 | ||
3009 | /* if gw_addr is local we will fail to detect this in case | |
3010 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
3011 | * will return already-added prefix route via interface that | |
3012 | * prefix route was assigned to, which might be non-loopback. | |
3013 | */ | |
232378e8 DA |
3014 | if (dev && |
3015 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3016 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
9fbb704c DA |
3017 | goto out; |
3018 | } | |
3019 | ||
3020 | if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) { | |
3021 | /* IPv6 strictly inhibits using not link-local | |
3022 | * addresses as nexthop address. | |
3023 | * Otherwise, router will not able to send redirects. | |
3024 | * It is very good, but in some (rare!) circumstances | |
3025 | * (SIT, PtP, NBMA NOARP links) it is handy to allow | |
3026 | * some exceptions. --ANK | |
3027 | * We allow IPv4-mapped nexthops to support RFC4798-type | |
3028 | * addressing | |
3029 | */ | |
3030 | if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) { | |
3031 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
3032 | goto out; | |
3033 | } | |
3034 | ||
3035 | if (cfg->fc_flags & RTNH_F_ONLINK) | |
3036 | err = ip6_route_check_nh_onlink(net, cfg, dev, extack); | |
3037 | else | |
3038 | err = ip6_route_check_nh(net, cfg, _dev, idev); | |
3039 | ||
3040 | if (err) | |
3041 | goto out; | |
3042 | } | |
3043 | ||
3044 | /* reload in case device was changed */ | |
3045 | dev = *_dev; | |
3046 | ||
3047 | err = -EINVAL; | |
3048 | if (!dev) { | |
3049 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
3050 | goto out; | |
3051 | } else if (dev->flags & IFF_LOOPBACK) { | |
3052 | NL_SET_ERR_MSG(extack, | |
3053 | "Egress device can not be loopback device for this route"); | |
3054 | goto out; | |
3055 | } | |
232378e8 DA |
3056 | |
3057 | /* if we did not check gw_addr above, do so now that the | |
3058 | * egress device has been resolved. | |
3059 | */ | |
3060 | if (need_addr_check && | |
3061 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3062 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
3063 | goto out; | |
3064 | } | |
3065 | ||
9fbb704c DA |
3066 | err = 0; |
3067 | out: | |
3068 | return err; | |
3069 | } | |
3070 | ||
83c44251 DA |
3071 | static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) |
3072 | { | |
3073 | if ((flags & RTF_REJECT) || | |
3074 | (dev && (dev->flags & IFF_LOOPBACK) && | |
3075 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
3076 | !(flags & RTF_LOCAL))) | |
3077 | return true; | |
3078 | ||
3079 | return false; | |
3080 | } | |
3081 | ||
3082 | int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, | |
3083 | struct fib6_config *cfg, gfp_t gfp_flags, | |
3084 | struct netlink_ext_ack *extack) | |
3085 | { | |
3086 | struct net_device *dev = NULL; | |
3087 | struct inet6_dev *idev = NULL; | |
3088 | int addr_type; | |
3089 | int err; | |
3090 | ||
f1741730 DA |
3091 | fib6_nh->fib_nh_family = AF_INET6; |
3092 | ||
83c44251 DA |
3093 | err = -ENODEV; |
3094 | if (cfg->fc_ifindex) { | |
3095 | dev = dev_get_by_index(net, cfg->fc_ifindex); | |
3096 | if (!dev) | |
3097 | goto out; | |
3098 | idev = in6_dev_get(dev); | |
3099 | if (!idev) | |
3100 | goto out; | |
3101 | } | |
3102 | ||
3103 | if (cfg->fc_flags & RTNH_F_ONLINK) { | |
3104 | if (!dev) { | |
3105 | NL_SET_ERR_MSG(extack, | |
3106 | "Nexthop device required for onlink"); | |
3107 | goto out; | |
3108 | } | |
3109 | ||
3110 | if (!(dev->flags & IFF_UP)) { | |
3111 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3112 | err = -ENETDOWN; | |
3113 | goto out; | |
3114 | } | |
3115 | ||
ad1601ae | 3116 | fib6_nh->fib_nh_flags |= RTNH_F_ONLINK; |
83c44251 DA |
3117 | } |
3118 | ||
ad1601ae | 3119 | fib6_nh->fib_nh_weight = 1; |
83c44251 DA |
3120 | |
3121 | /* We cannot add true routes via loopback here, | |
3122 | * they would result in kernel looping; promote them to reject routes | |
3123 | */ | |
3124 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3125 | if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) { | |
3126 | /* hold loopback dev/idev if we haven't done so. */ | |
3127 | if (dev != net->loopback_dev) { | |
3128 | if (dev) { | |
3129 | dev_put(dev); | |
3130 | in6_dev_put(idev); | |
3131 | } | |
3132 | dev = net->loopback_dev; | |
3133 | dev_hold(dev); | |
3134 | idev = in6_dev_get(dev); | |
3135 | if (!idev) { | |
3136 | err = -ENODEV; | |
3137 | goto out; | |
3138 | } | |
3139 | } | |
7dd73168 | 3140 | goto pcpu_alloc; |
83c44251 DA |
3141 | } |
3142 | ||
3143 | if (cfg->fc_flags & RTF_GATEWAY) { | |
3144 | err = ip6_validate_gw(net, cfg, &dev, &idev, extack); | |
3145 | if (err) | |
3146 | goto out; | |
3147 | ||
ad1601ae | 3148 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; |
bdf00467 | 3149 | fib6_nh->fib_nh_gw_family = AF_INET6; |
83c44251 DA |
3150 | } |
3151 | ||
3152 | err = -ENODEV; | |
3153 | if (!dev) | |
3154 | goto out; | |
3155 | ||
3156 | if (idev->cnf.disable_ipv6) { | |
3157 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device"); | |
3158 | err = -EACCES; | |
3159 | goto out; | |
3160 | } | |
3161 | ||
3162 | if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) { | |
3163 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3164 | err = -ENETDOWN; | |
3165 | goto out; | |
3166 | } | |
3167 | ||
3168 | if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) && | |
3169 | !netif_carrier_ok(dev)) | |
ad1601ae | 3170 | fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
83c44251 | 3171 | |
7dd73168 DA |
3172 | err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap, |
3173 | cfg->fc_encap_type, cfg, gfp_flags, extack); | |
3174 | if (err) | |
3175 | goto out; | |
3176 | ||
3177 | pcpu_alloc: | |
f40b6ae2 DA |
3178 | fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); |
3179 | if (!fib6_nh->rt6i_pcpu) { | |
3180 | err = -ENOMEM; | |
3181 | goto out; | |
3182 | } | |
3183 | ||
ad1601ae | 3184 | fib6_nh->fib_nh_dev = dev; |
f1741730 | 3185 | fib6_nh->fib_nh_oif = dev->ifindex; |
83c44251 DA |
3186 | err = 0; |
3187 | out: | |
3188 | if (idev) | |
3189 | in6_dev_put(idev); | |
3190 | ||
3191 | if (err) { | |
ad1601ae DA |
3192 | lwtstate_put(fib6_nh->fib_nh_lws); |
3193 | fib6_nh->fib_nh_lws = NULL; | |
83c44251 DA |
3194 | if (dev) |
3195 | dev_put(dev); | |
3196 | } | |
3197 | ||
3198 | return err; | |
3199 | } | |
3200 | ||
dac7d0f2 DA |
3201 | void fib6_nh_release(struct fib6_nh *fib6_nh) |
3202 | { | |
cc5c073a DA |
3203 | struct rt6_exception_bucket *bucket; |
3204 | ||
3205 | rcu_read_lock(); | |
3206 | ||
3207 | fib6_nh_flush_exceptions(fib6_nh, NULL); | |
3208 | bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL); | |
3209 | if (bucket) { | |
3210 | rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL); | |
3211 | kfree(bucket); | |
3212 | } | |
3213 | ||
3214 | rcu_read_unlock(); | |
3215 | ||
f40b6ae2 DA |
3216 | if (fib6_nh->rt6i_pcpu) { |
3217 | int cpu; | |
3218 | ||
3219 | for_each_possible_cpu(cpu) { | |
3220 | struct rt6_info **ppcpu_rt; | |
3221 | struct rt6_info *pcpu_rt; | |
3222 | ||
3223 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3224 | pcpu_rt = *ppcpu_rt; | |
3225 | if (pcpu_rt) { | |
3226 | dst_dev_put(&pcpu_rt->dst); | |
3227 | dst_release(&pcpu_rt->dst); | |
3228 | *ppcpu_rt = NULL; | |
3229 | } | |
3230 | } | |
3231 | ||
3232 | free_percpu(fib6_nh->rt6i_pcpu); | |
3233 | } | |
3234 | ||
979e276e | 3235 | fib_nh_common_release(&fib6_nh->nh_common); |
dac7d0f2 DA |
3236 | } |
3237 | ||
8d1c802b | 3238 | static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, |
acb54e3c | 3239 | gfp_t gfp_flags, |
333c4301 | 3240 | struct netlink_ext_ack *extack) |
1da177e4 | 3241 | { |
5578689a | 3242 | struct net *net = cfg->fc_nlinfo.nl_net; |
8d1c802b | 3243 | struct fib6_info *rt = NULL; |
f88d8ea6 | 3244 | struct nexthop *nh = NULL; |
c71099ac | 3245 | struct fib6_table *table; |
f88d8ea6 | 3246 | struct fib6_nh *fib6_nh; |
8c5b83f0 | 3247 | int err = -EINVAL; |
83c44251 | 3248 | int addr_type; |
1da177e4 | 3249 | |
557c44be | 3250 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
3251 | if (cfg->fc_flags & RTF_PCPU) { |
3252 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 3253 | goto out; |
d5d531cb | 3254 | } |
557c44be | 3255 | |
2ea2352e WW |
3256 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
3257 | if (cfg->fc_flags & RTF_CACHE) { | |
3258 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
3259 | goto out; | |
3260 | } | |
3261 | ||
e8478e80 DA |
3262 | if (cfg->fc_type > RTN_MAX) { |
3263 | NL_SET_ERR_MSG(extack, "Invalid route type"); | |
3264 | goto out; | |
3265 | } | |
3266 | ||
d5d531cb DA |
3267 | if (cfg->fc_dst_len > 128) { |
3268 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
3269 | goto out; | |
3270 | } | |
3271 | if (cfg->fc_src_len > 128) { | |
3272 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 3273 | goto out; |
d5d531cb | 3274 | } |
1da177e4 | 3275 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
3276 | if (cfg->fc_src_len) { |
3277 | NL_SET_ERR_MSG(extack, | |
3278 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 3279 | goto out; |
d5d531cb | 3280 | } |
1da177e4 | 3281 | #endif |
fc1e64e1 | 3282 | |
d71314b4 | 3283 | err = -ENOBUFS; |
38308473 DM |
3284 | if (cfg->fc_nlinfo.nlh && |
3285 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 3286 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 3287 | if (!table) { |
f3213831 | 3288 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
3289 | table = fib6_new_table(net, cfg->fc_table); |
3290 | } | |
3291 | } else { | |
3292 | table = fib6_new_table(net, cfg->fc_table); | |
3293 | } | |
38308473 DM |
3294 | |
3295 | if (!table) | |
c71099ac | 3296 | goto out; |
c71099ac | 3297 | |
93531c67 | 3298 | err = -ENOMEM; |
f88d8ea6 | 3299 | rt = fib6_info_alloc(gfp_flags, !nh); |
93531c67 | 3300 | if (!rt) |
1da177e4 | 3301 | goto out; |
93531c67 | 3302 | |
d7e774f3 DA |
3303 | rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len, |
3304 | extack); | |
767a2217 DA |
3305 | if (IS_ERR(rt->fib6_metrics)) { |
3306 | err = PTR_ERR(rt->fib6_metrics); | |
fda21d46 ED |
3307 | /* Do not leave garbage there. */ |
3308 | rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; | |
767a2217 DA |
3309 | goto out; |
3310 | } | |
3311 | ||
93531c67 DA |
3312 | if (cfg->fc_flags & RTF_ADDRCONF) |
3313 | rt->dst_nocount = true; | |
1da177e4 | 3314 | |
1716a961 | 3315 | if (cfg->fc_flags & RTF_EXPIRES) |
14895687 | 3316 | fib6_set_expires(rt, jiffies + |
1716a961 G |
3317 | clock_t_to_jiffies(cfg->fc_expires)); |
3318 | else | |
14895687 | 3319 | fib6_clean_expires(rt); |
1da177e4 | 3320 | |
86872cb5 TG |
3321 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
3322 | cfg->fc_protocol = RTPROT_BOOT; | |
93c2fb25 | 3323 | rt->fib6_protocol = cfg->fc_protocol; |
86872cb5 | 3324 | |
83c44251 DA |
3325 | rt->fib6_table = table; |
3326 | rt->fib6_metric = cfg->fc_metric; | |
3327 | rt->fib6_type = cfg->fc_type; | |
2b2450ca | 3328 | rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; |
19e42e45 | 3329 | |
93c2fb25 DA |
3330 | ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
3331 | rt->fib6_dst.plen = cfg->fc_dst_len; | |
3332 | if (rt->fib6_dst.plen == 128) | |
3b6761d1 | 3333 | rt->dst_host = true; |
e5fd387a | 3334 | |
1da177e4 | 3335 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
3336 | ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len); |
3337 | rt->fib6_src.plen = cfg->fc_src_len; | |
1da177e4 | 3338 | #endif |
f88d8ea6 DA |
3339 | if (nh) { |
3340 | if (!nexthop_get(nh)) { | |
3341 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
3342 | goto out; | |
3343 | } | |
3344 | if (rt->fib6_src.plen) { | |
4daa95af | 3345 | NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing"); |
f88d8ea6 DA |
3346 | goto out; |
3347 | } | |
3348 | rt->nh = nh; | |
3349 | fib6_nh = nexthop_fib6_nh(rt->nh); | |
3350 | } else { | |
3351 | err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack); | |
3352 | if (err) | |
3353 | goto out; | |
1da177e4 | 3354 | |
f88d8ea6 DA |
3355 | fib6_nh = rt->fib6_nh; |
3356 | ||
3357 | /* We cannot add true routes via loopback here, they would | |
3358 | * result in kernel looping; promote them to reject routes | |
3359 | */ | |
3360 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3361 | if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev, | |
3362 | addr_type)) | |
3363 | rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP; | |
3364 | } | |
955ec4cb | 3365 | |
c3968a85 | 3366 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
f88d8ea6 | 3367 | struct net_device *dev = fib6_nh->fib_nh_dev; |
83c44251 | 3368 | |
c3968a85 | 3369 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
d5d531cb | 3370 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
3371 | err = -EINVAL; |
3372 | goto out; | |
3373 | } | |
93c2fb25 DA |
3374 | rt->fib6_prefsrc.addr = cfg->fc_prefsrc; |
3375 | rt->fib6_prefsrc.plen = 128; | |
c3968a85 | 3376 | } else |
93c2fb25 | 3377 | rt->fib6_prefsrc.plen = 0; |
c3968a85 | 3378 | |
8c5b83f0 | 3379 | return rt; |
6b9ea5a6 | 3380 | out: |
93531c67 | 3381 | fib6_info_release(rt); |
8c5b83f0 | 3382 | return ERR_PTR(err); |
6b9ea5a6 RP |
3383 | } |
3384 | ||
acb54e3c | 3385 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
333c4301 | 3386 | struct netlink_ext_ack *extack) |
6b9ea5a6 | 3387 | { |
8d1c802b | 3388 | struct fib6_info *rt; |
6b9ea5a6 RP |
3389 | int err; |
3390 | ||
acb54e3c | 3391 | rt = ip6_route_info_create(cfg, gfp_flags, extack); |
d4ead6b3 DA |
3392 | if (IS_ERR(rt)) |
3393 | return PTR_ERR(rt); | |
6b9ea5a6 | 3394 | |
d4ead6b3 | 3395 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack); |
93531c67 | 3396 | fib6_info_release(rt); |
6b9ea5a6 | 3397 | |
1da177e4 LT |
3398 | return err; |
3399 | } | |
3400 | ||
8d1c802b | 3401 | static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 3402 | { |
afb1d4b5 | 3403 | struct net *net = info->nl_net; |
c71099ac | 3404 | struct fib6_table *table; |
afb1d4b5 | 3405 | int err; |
1da177e4 | 3406 | |
421842ed | 3407 | if (rt == net->ipv6.fib6_null_entry) { |
6825a26c G |
3408 | err = -ENOENT; |
3409 | goto out; | |
3410 | } | |
6c813a72 | 3411 | |
93c2fb25 | 3412 | table = rt->fib6_table; |
66f5d6ce | 3413 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 3414 | err = fib6_del(rt, info); |
66f5d6ce | 3415 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 3416 | |
6825a26c | 3417 | out: |
93531c67 | 3418 | fib6_info_release(rt); |
1da177e4 LT |
3419 | return err; |
3420 | } | |
3421 | ||
8d1c802b | 3422 | int ip6_del_rt(struct net *net, struct fib6_info *rt) |
e0a1ad73 | 3423 | { |
afb1d4b5 DA |
3424 | struct nl_info info = { .nl_net = net }; |
3425 | ||
528c4ceb | 3426 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
3427 | } |
3428 | ||
8d1c802b | 3429 | static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg) |
0ae81335 DA |
3430 | { |
3431 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 3432 | struct net *net = info->nl_net; |
16a16cd3 | 3433 | struct sk_buff *skb = NULL; |
0ae81335 | 3434 | struct fib6_table *table; |
e3330039 | 3435 | int err = -ENOENT; |
0ae81335 | 3436 | |
421842ed | 3437 | if (rt == net->ipv6.fib6_null_entry) |
e3330039 | 3438 | goto out_put; |
93c2fb25 | 3439 | table = rt->fib6_table; |
66f5d6ce | 3440 | spin_lock_bh(&table->tb6_lock); |
0ae81335 | 3441 | |
93c2fb25 | 3442 | if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) { |
8d1c802b | 3443 | struct fib6_info *sibling, *next_sibling; |
0ae81335 | 3444 | |
16a16cd3 DA |
3445 | /* prefer to send a single notification with all hops */ |
3446 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
3447 | if (skb) { | |
3448 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
3449 | ||
d4ead6b3 | 3450 | if (rt6_fill_node(net, skb, rt, NULL, |
16a16cd3 DA |
3451 | NULL, NULL, 0, RTM_DELROUTE, |
3452 | info->portid, seq, 0) < 0) { | |
3453 | kfree_skb(skb); | |
3454 | skb = NULL; | |
3455 | } else | |
3456 | info->skip_notify = 1; | |
3457 | } | |
3458 | ||
0ae81335 | 3459 | list_for_each_entry_safe(sibling, next_sibling, |
93c2fb25 DA |
3460 | &rt->fib6_siblings, |
3461 | fib6_siblings) { | |
0ae81335 DA |
3462 | err = fib6_del(sibling, info); |
3463 | if (err) | |
e3330039 | 3464 | goto out_unlock; |
0ae81335 DA |
3465 | } |
3466 | } | |
3467 | ||
3468 | err = fib6_del(rt, info); | |
e3330039 | 3469 | out_unlock: |
66f5d6ce | 3470 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 3471 | out_put: |
93531c67 | 3472 | fib6_info_release(rt); |
16a16cd3 DA |
3473 | |
3474 | if (skb) { | |
e3330039 | 3475 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
3476 | info->nlh, gfp_any()); |
3477 | } | |
0ae81335 DA |
3478 | return err; |
3479 | } | |
3480 | ||
0fa6efc5 | 3481 | static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg) |
23fb93a4 DA |
3482 | { |
3483 | int rc = -ESRCH; | |
3484 | ||
3485 | if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex) | |
3486 | goto out; | |
3487 | ||
3488 | if (cfg->fc_flags & RTF_GATEWAY && | |
3489 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
3490 | goto out; | |
761f6026 XL |
3491 | |
3492 | rc = rt6_remove_exception_rt(rt); | |
23fb93a4 DA |
3493 | out: |
3494 | return rc; | |
3495 | } | |
3496 | ||
0fa6efc5 DA |
3497 | static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt, |
3498 | struct fib6_nh *nh) | |
3499 | { | |
3500 | struct fib6_result res = { | |
3501 | .f6i = rt, | |
3502 | .nh = nh, | |
3503 | }; | |
3504 | struct rt6_info *rt_cache; | |
3505 | ||
3506 | rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src); | |
3507 | if (rt_cache) | |
3508 | return __ip6_del_cached_rt(rt_cache, cfg); | |
3509 | ||
3510 | return 0; | |
3511 | } | |
3512 | ||
333c4301 DA |
3513 | static int ip6_route_del(struct fib6_config *cfg, |
3514 | struct netlink_ext_ack *extack) | |
1da177e4 | 3515 | { |
c71099ac | 3516 | struct fib6_table *table; |
8d1c802b | 3517 | struct fib6_info *rt; |
1da177e4 | 3518 | struct fib6_node *fn; |
1da177e4 LT |
3519 | int err = -ESRCH; |
3520 | ||
5578689a | 3521 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
3522 | if (!table) { |
3523 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 3524 | return err; |
d5d531cb | 3525 | } |
c71099ac | 3526 | |
66f5d6ce | 3527 | rcu_read_lock(); |
1da177e4 | 3528 | |
c71099ac | 3529 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 3530 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 3531 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 3532 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 3533 | |
1da177e4 | 3534 | if (fn) { |
66f5d6ce | 3535 | for_each_fib6_node_rt_rcu(fn) { |
ad1601ae DA |
3536 | struct fib6_nh *nh; |
3537 | ||
1cf844c7 | 3538 | nh = rt->fib6_nh; |
2b760fcf | 3539 | if (cfg->fc_flags & RTF_CACHE) { |
23fb93a4 DA |
3540 | int rc; |
3541 | ||
0fa6efc5 DA |
3542 | rc = ip6_del_cached_rt(cfg, rt, nh); |
3543 | if (rc != -ESRCH) { | |
3544 | rcu_read_unlock(); | |
3545 | return rc; | |
23fb93a4 DA |
3546 | } |
3547 | continue; | |
2b760fcf | 3548 | } |
ad1601ae | 3549 | |
86872cb5 | 3550 | if (cfg->fc_ifindex && |
ad1601ae DA |
3551 | (!nh->fib_nh_dev || |
3552 | nh->fib_nh_dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 3553 | continue; |
86872cb5 | 3554 | if (cfg->fc_flags & RTF_GATEWAY && |
ad1601ae | 3555 | !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6)) |
1da177e4 | 3556 | continue; |
93c2fb25 | 3557 | if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric) |
1da177e4 | 3558 | continue; |
93c2fb25 | 3559 | if (cfg->fc_protocol && cfg->fc_protocol != rt->fib6_protocol) |
c2ed1880 | 3560 | continue; |
e873e4b9 WW |
3561 | if (!fib6_info_hold_safe(rt)) |
3562 | continue; | |
66f5d6ce | 3563 | rcu_read_unlock(); |
1da177e4 | 3564 | |
0ae81335 DA |
3565 | /* if gateway was specified only delete the one hop */ |
3566 | if (cfg->fc_flags & RTF_GATEWAY) | |
3567 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
3568 | ||
3569 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
3570 | } |
3571 | } | |
66f5d6ce | 3572 | rcu_read_unlock(); |
1da177e4 LT |
3573 | |
3574 | return err; | |
3575 | } | |
3576 | ||
6700c270 | 3577 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 3578 | { |
a6279458 | 3579 | struct netevent_redirect netevent; |
e8599ff4 | 3580 | struct rt6_info *rt, *nrt = NULL; |
85bd05de | 3581 | struct fib6_result res = {}; |
e8599ff4 DM |
3582 | struct ndisc_options ndopts; |
3583 | struct inet6_dev *in6_dev; | |
3584 | struct neighbour *neigh; | |
71bcdba0 | 3585 | struct rd_msg *msg; |
6e157b6a DM |
3586 | int optlen, on_link; |
3587 | u8 *lladdr; | |
e8599ff4 | 3588 | |
29a3cad5 | 3589 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 3590 | optlen -= sizeof(*msg); |
e8599ff4 DM |
3591 | |
3592 | if (optlen < 0) { | |
6e157b6a | 3593 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
3594 | return; |
3595 | } | |
3596 | ||
71bcdba0 | 3597 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 3598 | |
71bcdba0 | 3599 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 3600 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
3601 | return; |
3602 | } | |
3603 | ||
6e157b6a | 3604 | on_link = 0; |
71bcdba0 | 3605 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 3606 | on_link = 1; |
71bcdba0 | 3607 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 3608 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 3609 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
3610 | return; |
3611 | } | |
3612 | ||
3613 | in6_dev = __in6_dev_get(skb->dev); | |
3614 | if (!in6_dev) | |
3615 | return; | |
3616 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
3617 | return; | |
3618 | ||
3619 | /* RFC2461 8.1: | |
3620 | * The IP source address of the Redirect MUST be the same as the current | |
3621 | * first-hop router for the specified ICMP Destination Address. | |
3622 | */ | |
3623 | ||
f997c55c | 3624 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
3625 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
3626 | return; | |
3627 | } | |
6e157b6a DM |
3628 | |
3629 | lladdr = NULL; | |
e8599ff4 DM |
3630 | if (ndopts.nd_opts_tgt_lladdr) { |
3631 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
3632 | skb->dev); | |
3633 | if (!lladdr) { | |
3634 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
3635 | return; | |
3636 | } | |
3637 | } | |
3638 | ||
6e157b6a | 3639 | rt = (struct rt6_info *) dst; |
ec13ad1d | 3640 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 3641 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 3642 | return; |
6e157b6a | 3643 | } |
e8599ff4 | 3644 | |
6e157b6a DM |
3645 | /* Redirect received -> path was valid. |
3646 | * Look, redirects are sent only in response to data packets, | |
3647 | * so that this nexthop apparently is reachable. --ANK | |
3648 | */ | |
0dec879f | 3649 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 3650 | |
71bcdba0 | 3651 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
3652 | if (!neigh) |
3653 | return; | |
a6279458 | 3654 | |
1da177e4 LT |
3655 | /* |
3656 | * We have finally decided to accept it. | |
3657 | */ | |
3658 | ||
f997c55c | 3659 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
3660 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
3661 | NEIGH_UPDATE_F_OVERRIDE| | |
3662 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
3663 | NEIGH_UPDATE_F_ISROUTER)), |
3664 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 3665 | |
4d85cd0c | 3666 | rcu_read_lock(); |
85bd05de | 3667 | res.f6i = rcu_dereference(rt->from); |
ff24e498 | 3668 | if (!res.f6i) |
886b7a50 | 3669 | goto out; |
8a14e46f | 3670 | |
1cf844c7 | 3671 | res.nh = res.f6i->fib6_nh; |
7d21fec9 DA |
3672 | res.fib6_flags = res.f6i->fib6_flags; |
3673 | res.fib6_type = res.f6i->fib6_type; | |
85bd05de | 3674 | nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); |
38308473 | 3675 | if (!nrt) |
1da177e4 LT |
3676 | goto out; |
3677 | ||
3678 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
3679 | if (on_link) | |
3680 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
3681 | ||
4e3fd7a0 | 3682 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 3683 | |
886b7a50 | 3684 | /* rt6_insert_exception() will take care of duplicated exceptions */ |
5012f0a5 | 3685 | if (rt6_insert_exception(nrt, &res)) { |
2b760fcf WW |
3686 | dst_release_immediate(&nrt->dst); |
3687 | goto out; | |
3688 | } | |
1da177e4 | 3689 | |
d8d1f30b CG |
3690 | netevent.old = &rt->dst; |
3691 | netevent.new = &nrt->dst; | |
71bcdba0 | 3692 | netevent.daddr = &msg->dest; |
60592833 | 3693 | netevent.neigh = neigh; |
8d71740c TT |
3694 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
3695 | ||
1da177e4 | 3696 | out: |
886b7a50 | 3697 | rcu_read_unlock(); |
e8599ff4 | 3698 | neigh_release(neigh); |
6e157b6a DM |
3699 | } |
3700 | ||
70ceb4f5 | 3701 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 3702 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 3703 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
3704 | const struct in6_addr *gwaddr, |
3705 | struct net_device *dev) | |
70ceb4f5 | 3706 | { |
830218c1 DA |
3707 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
3708 | int ifindex = dev->ifindex; | |
70ceb4f5 | 3709 | struct fib6_node *fn; |
8d1c802b | 3710 | struct fib6_info *rt = NULL; |
c71099ac TG |
3711 | struct fib6_table *table; |
3712 | ||
830218c1 | 3713 | table = fib6_get_table(net, tb_id); |
38308473 | 3714 | if (!table) |
c71099ac | 3715 | return NULL; |
70ceb4f5 | 3716 | |
66f5d6ce | 3717 | rcu_read_lock(); |
38fbeeee | 3718 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
3719 | if (!fn) |
3720 | goto out; | |
3721 | ||
66f5d6ce | 3722 | for_each_fib6_node_rt_rcu(fn) { |
f88d8ea6 DA |
3723 | /* these routes do not use nexthops */ |
3724 | if (rt->nh) | |
3725 | continue; | |
1cf844c7 | 3726 | if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex) |
70ceb4f5 | 3727 | continue; |
2b2450ca | 3728 | if (!(rt->fib6_flags & RTF_ROUTEINFO) || |
1cf844c7 | 3729 | !rt->fib6_nh->fib_nh_gw_family) |
70ceb4f5 | 3730 | continue; |
1cf844c7 | 3731 | if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr)) |
70ceb4f5 | 3732 | continue; |
e873e4b9 WW |
3733 | if (!fib6_info_hold_safe(rt)) |
3734 | continue; | |
70ceb4f5 YH |
3735 | break; |
3736 | } | |
3737 | out: | |
66f5d6ce | 3738 | rcu_read_unlock(); |
70ceb4f5 YH |
3739 | return rt; |
3740 | } | |
3741 | ||
8d1c802b | 3742 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 3743 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
3744 | const struct in6_addr *gwaddr, |
3745 | struct net_device *dev, | |
95c96174 | 3746 | unsigned int pref) |
70ceb4f5 | 3747 | { |
86872cb5 | 3748 | struct fib6_config cfg = { |
238fc7ea | 3749 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 3750 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
3751 | .fc_dst_len = prefixlen, |
3752 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
3753 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 3754 | .fc_protocol = RTPROT_RA, |
e8478e80 | 3755 | .fc_type = RTN_UNICAST, |
15e47304 | 3756 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
3757 | .fc_nlinfo.nlh = NULL, |
3758 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
3759 | }; |
3760 | ||
830218c1 | 3761 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
3762 | cfg.fc_dst = *prefix; |
3763 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 3764 | |
e317da96 YH |
3765 | /* We should treat it as a default route if prefix length is 0. */ |
3766 | if (!prefixlen) | |
86872cb5 | 3767 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 3768 | |
acb54e3c | 3769 | ip6_route_add(&cfg, GFP_ATOMIC, NULL); |
70ceb4f5 | 3770 | |
830218c1 | 3771 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
3772 | } |
3773 | #endif | |
3774 | ||
8d1c802b | 3775 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 DA |
3776 | const struct in6_addr *addr, |
3777 | struct net_device *dev) | |
1ab1457c | 3778 | { |
830218c1 | 3779 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
8d1c802b | 3780 | struct fib6_info *rt; |
c71099ac | 3781 | struct fib6_table *table; |
1da177e4 | 3782 | |
afb1d4b5 | 3783 | table = fib6_get_table(net, tb_id); |
38308473 | 3784 | if (!table) |
c71099ac | 3785 | return NULL; |
1da177e4 | 3786 | |
66f5d6ce WW |
3787 | rcu_read_lock(); |
3788 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
f88d8ea6 | 3789 | struct fib6_nh *nh; |
ad1601ae | 3790 | |
f88d8ea6 DA |
3791 | /* RA routes do not use nexthops */ |
3792 | if (rt->nh) | |
3793 | continue; | |
3794 | ||
3795 | nh = rt->fib6_nh; | |
ad1601ae | 3796 | if (dev == nh->fib_nh_dev && |
93c2fb25 | 3797 | ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
ad1601ae | 3798 | ipv6_addr_equal(&nh->fib_nh_gw6, addr)) |
1da177e4 LT |
3799 | break; |
3800 | } | |
e873e4b9 WW |
3801 | if (rt && !fib6_info_hold_safe(rt)) |
3802 | rt = NULL; | |
66f5d6ce | 3803 | rcu_read_unlock(); |
1da177e4 LT |
3804 | return rt; |
3805 | } | |
3806 | ||
8d1c802b | 3807 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 3808 | const struct in6_addr *gwaddr, |
ebacaaa0 YH |
3809 | struct net_device *dev, |
3810 | unsigned int pref) | |
1da177e4 | 3811 | { |
86872cb5 | 3812 | struct fib6_config cfg = { |
ca254490 | 3813 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 3814 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
3815 | .fc_ifindex = dev->ifindex, |
3816 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
3817 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 3818 | .fc_protocol = RTPROT_RA, |
e8478e80 | 3819 | .fc_type = RTN_UNICAST, |
15e47304 | 3820 | .fc_nlinfo.portid = 0, |
5578689a | 3821 | .fc_nlinfo.nlh = NULL, |
afb1d4b5 | 3822 | .fc_nlinfo.nl_net = net, |
86872cb5 | 3823 | }; |
1da177e4 | 3824 | |
4e3fd7a0 | 3825 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 3826 | |
acb54e3c | 3827 | if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) { |
830218c1 DA |
3828 | struct fib6_table *table; |
3829 | ||
3830 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
3831 | if (table) | |
3832 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
3833 | } | |
1da177e4 | 3834 | |
afb1d4b5 | 3835 | return rt6_get_dflt_router(net, gwaddr, dev); |
1da177e4 LT |
3836 | } |
3837 | ||
afb1d4b5 DA |
3838 | static void __rt6_purge_dflt_routers(struct net *net, |
3839 | struct fib6_table *table) | |
1da177e4 | 3840 | { |
8d1c802b | 3841 | struct fib6_info *rt; |
1da177e4 LT |
3842 | |
3843 | restart: | |
66f5d6ce WW |
3844 | rcu_read_lock(); |
3845 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
dcd1f572 DA |
3846 | struct net_device *dev = fib6_info_nh_dev(rt); |
3847 | struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; | |
3848 | ||
93c2fb25 | 3849 | if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
e873e4b9 WW |
3850 | (!idev || idev->cnf.accept_ra != 2) && |
3851 | fib6_info_hold_safe(rt)) { | |
93531c67 DA |
3852 | rcu_read_unlock(); |
3853 | ip6_del_rt(net, rt); | |
1da177e4 LT |
3854 | goto restart; |
3855 | } | |
3856 | } | |
66f5d6ce | 3857 | rcu_read_unlock(); |
830218c1 DA |
3858 | |
3859 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
3860 | } | |
3861 | ||
3862 | void rt6_purge_dflt_routers(struct net *net) | |
3863 | { | |
3864 | struct fib6_table *table; | |
3865 | struct hlist_head *head; | |
3866 | unsigned int h; | |
3867 | ||
3868 | rcu_read_lock(); | |
3869 | ||
3870 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
3871 | head = &net->ipv6.fib_table_hash[h]; | |
3872 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
3873 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
afb1d4b5 | 3874 | __rt6_purge_dflt_routers(net, table); |
830218c1 DA |
3875 | } |
3876 | } | |
3877 | ||
3878 | rcu_read_unlock(); | |
1da177e4 LT |
3879 | } |
3880 | ||
5578689a DL |
3881 | static void rtmsg_to_fib6_config(struct net *net, |
3882 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
3883 | struct fib6_config *cfg) |
3884 | { | |
8823a3ac MŻ |
3885 | *cfg = (struct fib6_config){ |
3886 | .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? | |
3887 | : RT6_TABLE_MAIN, | |
3888 | .fc_ifindex = rtmsg->rtmsg_ifindex, | |
67f69513 | 3889 | .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER, |
8823a3ac MŻ |
3890 | .fc_expires = rtmsg->rtmsg_info, |
3891 | .fc_dst_len = rtmsg->rtmsg_dst_len, | |
3892 | .fc_src_len = rtmsg->rtmsg_src_len, | |
3893 | .fc_flags = rtmsg->rtmsg_flags, | |
3894 | .fc_type = rtmsg->rtmsg_type, | |
3895 | ||
3896 | .fc_nlinfo.nl_net = net, | |
3897 | ||
3898 | .fc_dst = rtmsg->rtmsg_dst, | |
3899 | .fc_src = rtmsg->rtmsg_src, | |
3900 | .fc_gateway = rtmsg->rtmsg_gateway, | |
3901 | }; | |
86872cb5 TG |
3902 | } |
3903 | ||
5578689a | 3904 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 3905 | { |
86872cb5 | 3906 | struct fib6_config cfg; |
1da177e4 LT |
3907 | struct in6_rtmsg rtmsg; |
3908 | int err; | |
3909 | ||
67ba4152 | 3910 | switch (cmd) { |
1da177e4 LT |
3911 | case SIOCADDRT: /* Add a route */ |
3912 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 3913 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
3914 | return -EPERM; |
3915 | err = copy_from_user(&rtmsg, arg, | |
3916 | sizeof(struct in6_rtmsg)); | |
3917 | if (err) | |
3918 | return -EFAULT; | |
86872cb5 | 3919 | |
5578689a | 3920 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 3921 | |
1da177e4 LT |
3922 | rtnl_lock(); |
3923 | switch (cmd) { | |
3924 | case SIOCADDRT: | |
acb54e3c | 3925 | err = ip6_route_add(&cfg, GFP_KERNEL, NULL); |
1da177e4 LT |
3926 | break; |
3927 | case SIOCDELRT: | |
333c4301 | 3928 | err = ip6_route_del(&cfg, NULL); |
1da177e4 LT |
3929 | break; |
3930 | default: | |
3931 | err = -EINVAL; | |
3932 | } | |
3933 | rtnl_unlock(); | |
3934 | ||
3935 | return err; | |
3ff50b79 | 3936 | } |
1da177e4 LT |
3937 | |
3938 | return -EINVAL; | |
3939 | } | |
3940 | ||
3941 | /* | |
3942 | * Drop the packet on the floor | |
3943 | */ | |
3944 | ||
d5fdd6ba | 3945 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 3946 | { |
adf30907 | 3947 | struct dst_entry *dst = skb_dst(skb); |
1d3fd8a1 SS |
3948 | struct net *net = dev_net(dst->dev); |
3949 | struct inet6_dev *idev; | |
3950 | int type; | |
3951 | ||
3952 | if (netif_is_l3_master(skb->dev) && | |
3953 | dst->dev == net->loopback_dev) | |
3954 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); | |
3955 | else | |
3956 | idev = ip6_dst_idev(dst); | |
3957 | ||
612f09e8 YH |
3958 | switch (ipstats_mib_noroutes) { |
3959 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 3960 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 3961 | if (type == IPV6_ADDR_ANY) { |
1d3fd8a1 | 3962 | IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
612f09e8 YH |
3963 | break; |
3964 | } | |
3965 | /* FALLTHROUGH */ | |
3966 | case IPSTATS_MIB_OUTNOROUTES: | |
1d3fd8a1 | 3967 | IP6_INC_STATS(net, idev, ipstats_mib_noroutes); |
612f09e8 YH |
3968 | break; |
3969 | } | |
1d3fd8a1 SS |
3970 | |
3971 | /* Start over by dropping the dst for l3mdev case */ | |
3972 | if (netif_is_l3_master(skb->dev)) | |
3973 | skb_dst_drop(skb); | |
3974 | ||
3ffe533c | 3975 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
3976 | kfree_skb(skb); |
3977 | return 0; | |
3978 | } | |
3979 | ||
9ce8ade0 TG |
3980 | static int ip6_pkt_discard(struct sk_buff *skb) |
3981 | { | |
612f09e8 | 3982 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
3983 | } |
3984 | ||
ede2059d | 3985 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 3986 | { |
adf30907 | 3987 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 3988 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
3989 | } |
3990 | ||
9ce8ade0 TG |
3991 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
3992 | { | |
612f09e8 | 3993 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
3994 | } |
3995 | ||
ede2059d | 3996 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 3997 | { |
adf30907 | 3998 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 3999 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
4000 | } |
4001 | ||
1da177e4 LT |
4002 | /* |
4003 | * Allocate a dst for local (unicast / anycast) address. | |
4004 | */ | |
4005 | ||
360a9887 DA |
4006 | struct fib6_info *addrconf_f6i_alloc(struct net *net, |
4007 | struct inet6_dev *idev, | |
4008 | const struct in6_addr *addr, | |
4009 | bool anycast, gfp_t gfp_flags) | |
1da177e4 | 4010 | { |
c7a1ce39 DA |
4011 | struct fib6_config cfg = { |
4012 | .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, | |
4013 | .fc_ifindex = idev->dev->ifindex, | |
4014 | .fc_flags = RTF_UP | RTF_ADDRCONF | RTF_NONEXTHOP, | |
4015 | .fc_dst = *addr, | |
4016 | .fc_dst_len = 128, | |
4017 | .fc_protocol = RTPROT_KERNEL, | |
4018 | .fc_nlinfo.nl_net = net, | |
4019 | .fc_ignore_dev_down = true, | |
4020 | }; | |
1da177e4 | 4021 | |
e8478e80 | 4022 | if (anycast) { |
c7a1ce39 DA |
4023 | cfg.fc_type = RTN_ANYCAST; |
4024 | cfg.fc_flags |= RTF_ANYCAST; | |
e8478e80 | 4025 | } else { |
c7a1ce39 DA |
4026 | cfg.fc_type = RTN_LOCAL; |
4027 | cfg.fc_flags |= RTF_LOCAL; | |
e8478e80 | 4028 | } |
1da177e4 | 4029 | |
c7a1ce39 | 4030 | return ip6_route_info_create(&cfg, gfp_flags, NULL); |
1da177e4 LT |
4031 | } |
4032 | ||
c3968a85 DW |
4033 | /* remove deleted ip from prefsrc entries */ |
4034 | struct arg_dev_net_ip { | |
4035 | struct net_device *dev; | |
4036 | struct net *net; | |
4037 | struct in6_addr *addr; | |
4038 | }; | |
4039 | ||
8d1c802b | 4040 | static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) |
c3968a85 DW |
4041 | { |
4042 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
4043 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
4044 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
4045 | ||
f88d8ea6 DA |
4046 | if (!rt->nh && |
4047 | ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) && | |
421842ed | 4048 | rt != net->ipv6.fib6_null_entry && |
93c2fb25 | 4049 | ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) { |
60006a48 | 4050 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 | 4051 | /* remove prefsrc entry */ |
93c2fb25 | 4052 | rt->fib6_prefsrc.plen = 0; |
60006a48 | 4053 | spin_unlock_bh(&rt6_exception_lock); |
c3968a85 DW |
4054 | } |
4055 | return 0; | |
4056 | } | |
4057 | ||
4058 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
4059 | { | |
4060 | struct net *net = dev_net(ifp->idev->dev); | |
4061 | struct arg_dev_net_ip adni = { | |
4062 | .dev = ifp->idev->dev, | |
4063 | .net = net, | |
4064 | .addr = &ifp->addr, | |
4065 | }; | |
0c3584d5 | 4066 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
4067 | } |
4068 | ||
2b2450ca | 4069 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) |
be7a010d DJ |
4070 | |
4071 | /* Remove routers and update dst entries when gateway turn into host. */ | |
8d1c802b | 4072 | static int fib6_clean_tohost(struct fib6_info *rt, void *arg) |
be7a010d DJ |
4073 | { |
4074 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
f88d8ea6 DA |
4075 | struct fib6_nh *nh; |
4076 | ||
4077 | /* RA routes do not use nexthops */ | |
4078 | if (rt->nh) | |
4079 | return 0; | |
be7a010d | 4080 | |
f88d8ea6 | 4081 | nh = rt->fib6_nh; |
93c2fb25 | 4082 | if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
cc5c073a | 4083 | nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6)) |
be7a010d | 4084 | return -1; |
b16cb459 WW |
4085 | |
4086 | /* Further clean up cached routes in exception table. | |
4087 | * This is needed because cached route may have a different | |
4088 | * gateway than its 'parent' in the case of an ip redirect. | |
4089 | */ | |
cc5c073a | 4090 | fib6_nh_exceptions_clean_tohost(nh, gateway); |
b16cb459 | 4091 | |
be7a010d DJ |
4092 | return 0; |
4093 | } | |
4094 | ||
4095 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
4096 | { | |
4097 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
4098 | } | |
4099 | ||
2127d95a IS |
4100 | struct arg_netdev_event { |
4101 | const struct net_device *dev; | |
4c981e28 | 4102 | union { |
ecc5663c | 4103 | unsigned char nh_flags; |
4c981e28 IS |
4104 | unsigned long event; |
4105 | }; | |
2127d95a IS |
4106 | }; |
4107 | ||
8d1c802b | 4108 | static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt) |
d7dedee1 | 4109 | { |
8d1c802b | 4110 | struct fib6_info *iter; |
d7dedee1 IS |
4111 | struct fib6_node *fn; |
4112 | ||
93c2fb25 DA |
4113 | fn = rcu_dereference_protected(rt->fib6_node, |
4114 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
d7dedee1 | 4115 | iter = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 4116 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 | 4117 | while (iter) { |
93c2fb25 | 4118 | if (iter->fib6_metric == rt->fib6_metric && |
33bd5ac5 | 4119 | rt6_qualify_for_ecmp(iter)) |
d7dedee1 | 4120 | return iter; |
8fb11a9a | 4121 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 4122 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 IS |
4123 | } |
4124 | ||
4125 | return NULL; | |
4126 | } | |
4127 | ||
f88d8ea6 | 4128 | /* only called for fib entries with builtin fib6_nh */ |
8d1c802b | 4129 | static bool rt6_is_dead(const struct fib6_info *rt) |
d7dedee1 | 4130 | { |
1cf844c7 DA |
4131 | if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD || |
4132 | (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
4133 | ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev))) | |
d7dedee1 IS |
4134 | return true; |
4135 | ||
4136 | return false; | |
4137 | } | |
4138 | ||
8d1c802b | 4139 | static int rt6_multipath_total_weight(const struct fib6_info *rt) |
d7dedee1 | 4140 | { |
8d1c802b | 4141 | struct fib6_info *iter; |
d7dedee1 IS |
4142 | int total = 0; |
4143 | ||
4144 | if (!rt6_is_dead(rt)) | |
1cf844c7 | 4145 | total += rt->fib6_nh->fib_nh_weight; |
d7dedee1 | 4146 | |
93c2fb25 | 4147 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { |
d7dedee1 | 4148 | if (!rt6_is_dead(iter)) |
1cf844c7 | 4149 | total += iter->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4150 | } |
4151 | ||
4152 | return total; | |
4153 | } | |
4154 | ||
8d1c802b | 4155 | static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total) |
d7dedee1 IS |
4156 | { |
4157 | int upper_bound = -1; | |
4158 | ||
4159 | if (!rt6_is_dead(rt)) { | |
1cf844c7 | 4160 | *weight += rt->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4161 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, |
4162 | total) - 1; | |
4163 | } | |
1cf844c7 | 4164 | atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound); |
d7dedee1 IS |
4165 | } |
4166 | ||
8d1c802b | 4167 | static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total) |
d7dedee1 | 4168 | { |
8d1c802b | 4169 | struct fib6_info *iter; |
d7dedee1 IS |
4170 | int weight = 0; |
4171 | ||
4172 | rt6_upper_bound_set(rt, &weight, total); | |
4173 | ||
93c2fb25 | 4174 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
d7dedee1 IS |
4175 | rt6_upper_bound_set(iter, &weight, total); |
4176 | } | |
4177 | ||
8d1c802b | 4178 | void rt6_multipath_rebalance(struct fib6_info *rt) |
d7dedee1 | 4179 | { |
8d1c802b | 4180 | struct fib6_info *first; |
d7dedee1 IS |
4181 | int total; |
4182 | ||
4183 | /* In case the entire multipath route was marked for flushing, | |
4184 | * then there is no need to rebalance upon the removal of every | |
4185 | * sibling route. | |
4186 | */ | |
93c2fb25 | 4187 | if (!rt->fib6_nsiblings || rt->should_flush) |
d7dedee1 IS |
4188 | return; |
4189 | ||
4190 | /* During lookup routes are evaluated in order, so we need to | |
4191 | * make sure upper bounds are assigned from the first sibling | |
4192 | * onwards. | |
4193 | */ | |
4194 | first = rt6_multipath_first_sibling(rt); | |
4195 | if (WARN_ON_ONCE(!first)) | |
4196 | return; | |
4197 | ||
4198 | total = rt6_multipath_total_weight(first); | |
4199 | rt6_multipath_upper_bound_set(first, total); | |
4200 | } | |
4201 | ||
8d1c802b | 4202 | static int fib6_ifup(struct fib6_info *rt, void *p_arg) |
2127d95a IS |
4203 | { |
4204 | const struct arg_netdev_event *arg = p_arg; | |
7aef6859 | 4205 | struct net *net = dev_net(arg->dev); |
2127d95a | 4206 | |
f88d8ea6 | 4207 | if (rt != net->ipv6.fib6_null_entry && !rt->nh && |
1cf844c7 DA |
4208 | rt->fib6_nh->fib_nh_dev == arg->dev) { |
4209 | rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags; | |
7aef6859 | 4210 | fib6_update_sernum_upto_root(net, rt); |
d7dedee1 | 4211 | rt6_multipath_rebalance(rt); |
1de178ed | 4212 | } |
2127d95a IS |
4213 | |
4214 | return 0; | |
4215 | } | |
4216 | ||
ecc5663c | 4217 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags) |
2127d95a IS |
4218 | { |
4219 | struct arg_netdev_event arg = { | |
4220 | .dev = dev, | |
6802f3ad IS |
4221 | { |
4222 | .nh_flags = nh_flags, | |
4223 | }, | |
2127d95a IS |
4224 | }; |
4225 | ||
4226 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
4227 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
4228 | ||
4229 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
4230 | } | |
4231 | ||
f88d8ea6 | 4232 | /* only called for fib entries with inline fib6_nh */ |
8d1c802b | 4233 | static bool rt6_multipath_uses_dev(const struct fib6_info *rt, |
1de178ed IS |
4234 | const struct net_device *dev) |
4235 | { | |
8d1c802b | 4236 | struct fib6_info *iter; |
1de178ed | 4237 | |
1cf844c7 | 4238 | if (rt->fib6_nh->fib_nh_dev == dev) |
1de178ed | 4239 | return true; |
93c2fb25 | 4240 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 | 4241 | if (iter->fib6_nh->fib_nh_dev == dev) |
1de178ed IS |
4242 | return true; |
4243 | ||
4244 | return false; | |
4245 | } | |
4246 | ||
8d1c802b | 4247 | static void rt6_multipath_flush(struct fib6_info *rt) |
1de178ed | 4248 | { |
8d1c802b | 4249 | struct fib6_info *iter; |
1de178ed IS |
4250 | |
4251 | rt->should_flush = 1; | |
93c2fb25 | 4252 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1de178ed IS |
4253 | iter->should_flush = 1; |
4254 | } | |
4255 | ||
8d1c802b | 4256 | static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt, |
1de178ed IS |
4257 | const struct net_device *down_dev) |
4258 | { | |
8d1c802b | 4259 | struct fib6_info *iter; |
1de178ed IS |
4260 | unsigned int dead = 0; |
4261 | ||
1cf844c7 DA |
4262 | if (rt->fib6_nh->fib_nh_dev == down_dev || |
4263 | rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed | 4264 | dead++; |
93c2fb25 | 4265 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4266 | if (iter->fib6_nh->fib_nh_dev == down_dev || |
4267 | iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed IS |
4268 | dead++; |
4269 | ||
4270 | return dead; | |
4271 | } | |
4272 | ||
8d1c802b | 4273 | static void rt6_multipath_nh_flags_set(struct fib6_info *rt, |
1de178ed | 4274 | const struct net_device *dev, |
ecc5663c | 4275 | unsigned char nh_flags) |
1de178ed | 4276 | { |
8d1c802b | 4277 | struct fib6_info *iter; |
1de178ed | 4278 | |
1cf844c7 DA |
4279 | if (rt->fib6_nh->fib_nh_dev == dev) |
4280 | rt->fib6_nh->fib_nh_flags |= nh_flags; | |
93c2fb25 | 4281 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4282 | if (iter->fib6_nh->fib_nh_dev == dev) |
4283 | iter->fib6_nh->fib_nh_flags |= nh_flags; | |
1de178ed IS |
4284 | } |
4285 | ||
a1a22c12 | 4286 | /* called with write lock held for table with rt */ |
8d1c802b | 4287 | static int fib6_ifdown(struct fib6_info *rt, void *p_arg) |
1da177e4 | 4288 | { |
4c981e28 IS |
4289 | const struct arg_netdev_event *arg = p_arg; |
4290 | const struct net_device *dev = arg->dev; | |
7aef6859 | 4291 | struct net *net = dev_net(dev); |
8ed67789 | 4292 | |
f88d8ea6 | 4293 | if (rt == net->ipv6.fib6_null_entry || rt->nh) |
27c6fa73 IS |
4294 | return 0; |
4295 | ||
4296 | switch (arg->event) { | |
4297 | case NETDEV_UNREGISTER: | |
1cf844c7 | 4298 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
27c6fa73 | 4299 | case NETDEV_DOWN: |
1de178ed | 4300 | if (rt->should_flush) |
27c6fa73 | 4301 | return -1; |
93c2fb25 | 4302 | if (!rt->fib6_nsiblings) |
1cf844c7 | 4303 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
1de178ed IS |
4304 | if (rt6_multipath_uses_dev(rt, dev)) { |
4305 | unsigned int count; | |
4306 | ||
4307 | count = rt6_multipath_dead_count(rt, dev); | |
93c2fb25 | 4308 | if (rt->fib6_nsiblings + 1 == count) { |
1de178ed IS |
4309 | rt6_multipath_flush(rt); |
4310 | return -1; | |
4311 | } | |
4312 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
4313 | RTNH_F_LINKDOWN); | |
7aef6859 | 4314 | fib6_update_sernum(net, rt); |
d7dedee1 | 4315 | rt6_multipath_rebalance(rt); |
1de178ed IS |
4316 | } |
4317 | return -2; | |
27c6fa73 | 4318 | case NETDEV_CHANGE: |
1cf844c7 | 4319 | if (rt->fib6_nh->fib_nh_dev != dev || |
93c2fb25 | 4320 | rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) |
27c6fa73 | 4321 | break; |
1cf844c7 | 4322 | rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
d7dedee1 | 4323 | rt6_multipath_rebalance(rt); |
27c6fa73 | 4324 | break; |
2b241361 | 4325 | } |
c159d30c | 4326 | |
1da177e4 LT |
4327 | return 0; |
4328 | } | |
4329 | ||
27c6fa73 | 4330 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 4331 | { |
4c981e28 | 4332 | struct arg_netdev_event arg = { |
8ed67789 | 4333 | .dev = dev, |
6802f3ad IS |
4334 | { |
4335 | .event = event, | |
4336 | }, | |
8ed67789 | 4337 | }; |
7c6bb7d2 | 4338 | struct net *net = dev_net(dev); |
8ed67789 | 4339 | |
7c6bb7d2 DA |
4340 | if (net->ipv6.sysctl.skip_notify_on_dev_down) |
4341 | fib6_clean_all_skip_notify(net, fib6_ifdown, &arg); | |
4342 | else | |
4343 | fib6_clean_all(net, fib6_ifdown, &arg); | |
4c981e28 IS |
4344 | } |
4345 | ||
4346 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
4347 | { | |
4348 | rt6_sync_down_dev(dev, event); | |
4349 | rt6_uncached_list_flush_dev(dev_net(dev), dev); | |
4350 | neigh_ifdown(&nd_tbl, dev); | |
1da177e4 LT |
4351 | } |
4352 | ||
95c96174 | 4353 | struct rt6_mtu_change_arg { |
1da177e4 | 4354 | struct net_device *dev; |
95c96174 | 4355 | unsigned int mtu; |
c0b220cf | 4356 | struct fib6_info *f6i; |
1da177e4 LT |
4357 | }; |
4358 | ||
cc5c073a | 4359 | static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg) |
c0b220cf DA |
4360 | { |
4361 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg; | |
cc5c073a | 4362 | struct fib6_info *f6i = arg->f6i; |
c0b220cf DA |
4363 | |
4364 | /* For administrative MTU increase, there is no way to discover | |
4365 | * IPv6 PMTU increase, so PMTU increase should be updated here. | |
4366 | * Since RFC 1981 doesn't include administrative MTU increase | |
4367 | * update PMTU increase is a MUST. (i.e. jumbo frame) | |
4368 | */ | |
4369 | if (nh->fib_nh_dev == arg->dev) { | |
4370 | struct inet6_dev *idev = __in6_dev_get(arg->dev); | |
4371 | u32 mtu = f6i->fib6_pmtu; | |
4372 | ||
4373 | if (mtu >= arg->mtu || | |
4374 | (mtu < arg->mtu && mtu == idev->cnf.mtu6)) | |
4375 | fib6_metric_set(f6i, RTAX_MTU, arg->mtu); | |
4376 | ||
4377 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 4378 | rt6_exceptions_update_pmtu(idev, nh, arg->mtu); |
c0b220cf DA |
4379 | spin_unlock_bh(&rt6_exception_lock); |
4380 | } | |
4381 | ||
4382 | return 0; | |
4383 | } | |
4384 | ||
4385 | static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg) | |
1da177e4 LT |
4386 | { |
4387 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
4388 | struct inet6_dev *idev; | |
4389 | ||
4390 | /* In IPv6 pmtu discovery is not optional, | |
4391 | so that RTAX_MTU lock cannot disable it. | |
4392 | We still use this lock to block changes | |
4393 | caused by addrconf/ndisc. | |
4394 | */ | |
4395 | ||
4396 | idev = __in6_dev_get(arg->dev); | |
38308473 | 4397 | if (!idev) |
1da177e4 LT |
4398 | return 0; |
4399 | ||
c0b220cf DA |
4400 | if (fib6_metric_locked(f6i, RTAX_MTU)) |
4401 | return 0; | |
d4ead6b3 | 4402 | |
c0b220cf | 4403 | arg->f6i = f6i; |
1cf844c7 | 4404 | return fib6_nh_mtu_change(f6i->fib6_nh, arg); |
1da177e4 LT |
4405 | } |
4406 | ||
95c96174 | 4407 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 4408 | { |
c71099ac TG |
4409 | struct rt6_mtu_change_arg arg = { |
4410 | .dev = dev, | |
4411 | .mtu = mtu, | |
4412 | }; | |
1da177e4 | 4413 | |
0c3584d5 | 4414 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
4415 | } |
4416 | ||
ef7c79ed | 4417 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
75425657 | 4418 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
5176f91e | 4419 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
aa8f8778 | 4420 | [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 4421 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 4422 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
4423 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
4424 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 4425 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 4426 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
4427 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
4428 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 4429 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 4430 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 4431 | [RTA_MARK] = { .type = NLA_U32 }, |
aa8f8778 | 4432 | [RTA_TABLE] = { .type = NLA_U32 }, |
eacb9384 RP |
4433 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
4434 | [RTA_SPORT] = { .type = NLA_U16 }, | |
4435 | [RTA_DPORT] = { .type = NLA_U16 }, | |
86872cb5 TG |
4436 | }; |
4437 | ||
4438 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
4439 | struct fib6_config *cfg, |
4440 | struct netlink_ext_ack *extack) | |
1da177e4 | 4441 | { |
86872cb5 TG |
4442 | struct rtmsg *rtm; |
4443 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 4444 | unsigned int pref; |
86872cb5 | 4445 | int err; |
1da177e4 | 4446 | |
8cb08174 JB |
4447 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
4448 | rtm_ipv6_policy, extack); | |
86872cb5 TG |
4449 | if (err < 0) |
4450 | goto errout; | |
1da177e4 | 4451 | |
86872cb5 TG |
4452 | err = -EINVAL; |
4453 | rtm = nlmsg_data(nlh); | |
86872cb5 | 4454 | |
84db8407 MŻ |
4455 | *cfg = (struct fib6_config){ |
4456 | .fc_table = rtm->rtm_table, | |
4457 | .fc_dst_len = rtm->rtm_dst_len, | |
4458 | .fc_src_len = rtm->rtm_src_len, | |
4459 | .fc_flags = RTF_UP, | |
4460 | .fc_protocol = rtm->rtm_protocol, | |
4461 | .fc_type = rtm->rtm_type, | |
4462 | ||
4463 | .fc_nlinfo.portid = NETLINK_CB(skb).portid, | |
4464 | .fc_nlinfo.nlh = nlh, | |
4465 | .fc_nlinfo.nl_net = sock_net(skb->sk), | |
4466 | }; | |
86872cb5 | 4467 | |
ef2c7d7b ND |
4468 | if (rtm->rtm_type == RTN_UNREACHABLE || |
4469 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
4470 | rtm->rtm_type == RTN_PROHIBIT || |
4471 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
4472 | cfg->fc_flags |= RTF_REJECT; |
4473 | ||
ab79ad14 MŻ |
4474 | if (rtm->rtm_type == RTN_LOCAL) |
4475 | cfg->fc_flags |= RTF_LOCAL; | |
4476 | ||
1f56a01f MKL |
4477 | if (rtm->rtm_flags & RTM_F_CLONED) |
4478 | cfg->fc_flags |= RTF_CACHE; | |
4479 | ||
fc1e64e1 DA |
4480 | cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK); |
4481 | ||
86872cb5 | 4482 | if (tb[RTA_GATEWAY]) { |
67b61f6c | 4483 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 4484 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 4485 | } |
e3818541 DA |
4486 | if (tb[RTA_VIA]) { |
4487 | NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute"); | |
4488 | goto errout; | |
4489 | } | |
86872cb5 TG |
4490 | |
4491 | if (tb[RTA_DST]) { | |
4492 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
4493 | ||
4494 | if (nla_len(tb[RTA_DST]) < plen) | |
4495 | goto errout; | |
4496 | ||
4497 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 4498 | } |
86872cb5 TG |
4499 | |
4500 | if (tb[RTA_SRC]) { | |
4501 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
4502 | ||
4503 | if (nla_len(tb[RTA_SRC]) < plen) | |
4504 | goto errout; | |
4505 | ||
4506 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 4507 | } |
86872cb5 | 4508 | |
c3968a85 | 4509 | if (tb[RTA_PREFSRC]) |
67b61f6c | 4510 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 4511 | |
86872cb5 TG |
4512 | if (tb[RTA_OIF]) |
4513 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
4514 | ||
4515 | if (tb[RTA_PRIORITY]) | |
4516 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
4517 | ||
4518 | if (tb[RTA_METRICS]) { | |
4519 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
4520 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 4521 | } |
86872cb5 TG |
4522 | |
4523 | if (tb[RTA_TABLE]) | |
4524 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
4525 | ||
51ebd318 ND |
4526 | if (tb[RTA_MULTIPATH]) { |
4527 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
4528 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
4529 | |
4530 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 4531 | cfg->fc_mp_len, extack); |
9ed59592 DA |
4532 | if (err < 0) |
4533 | goto errout; | |
51ebd318 ND |
4534 | } |
4535 | ||
c78ba6d6 LR |
4536 | if (tb[RTA_PREF]) { |
4537 | pref = nla_get_u8(tb[RTA_PREF]); | |
4538 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
4539 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
4540 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
4541 | cfg->fc_flags |= RTF_PREF(pref); | |
4542 | } | |
4543 | ||
19e42e45 RP |
4544 | if (tb[RTA_ENCAP]) |
4545 | cfg->fc_encap = tb[RTA_ENCAP]; | |
4546 | ||
9ed59592 | 4547 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
4548 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
4549 | ||
c255bd68 | 4550 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
4551 | if (err < 0) |
4552 | goto errout; | |
4553 | } | |
4554 | ||
32bc201e XL |
4555 | if (tb[RTA_EXPIRES]) { |
4556 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
4557 | ||
4558 | if (addrconf_finite_timeout(timeout)) { | |
4559 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
4560 | cfg->fc_flags |= RTF_EXPIRES; | |
4561 | } | |
4562 | } | |
4563 | ||
86872cb5 TG |
4564 | err = 0; |
4565 | errout: | |
4566 | return err; | |
1da177e4 LT |
4567 | } |
4568 | ||
6b9ea5a6 | 4569 | struct rt6_nh { |
8d1c802b | 4570 | struct fib6_info *fib6_info; |
6b9ea5a6 | 4571 | struct fib6_config r_cfg; |
6b9ea5a6 RP |
4572 | struct list_head next; |
4573 | }; | |
4574 | ||
d4ead6b3 DA |
4575 | static int ip6_route_info_append(struct net *net, |
4576 | struct list_head *rt6_nh_list, | |
8d1c802b DA |
4577 | struct fib6_info *rt, |
4578 | struct fib6_config *r_cfg) | |
6b9ea5a6 RP |
4579 | { |
4580 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
4581 | int err = -EEXIST; |
4582 | ||
4583 | list_for_each_entry(nh, rt6_nh_list, next) { | |
8d1c802b DA |
4584 | /* check if fib6_info already exists */ |
4585 | if (rt6_duplicate_nexthop(nh->fib6_info, rt)) | |
6b9ea5a6 RP |
4586 | return err; |
4587 | } | |
4588 | ||
4589 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
4590 | if (!nh) | |
4591 | return -ENOMEM; | |
8d1c802b | 4592 | nh->fib6_info = rt; |
6b9ea5a6 RP |
4593 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); |
4594 | list_add_tail(&nh->next, rt6_nh_list); | |
4595 | ||
4596 | return 0; | |
4597 | } | |
4598 | ||
8d1c802b DA |
4599 | static void ip6_route_mpath_notify(struct fib6_info *rt, |
4600 | struct fib6_info *rt_last, | |
3b1137fe DA |
4601 | struct nl_info *info, |
4602 | __u16 nlflags) | |
4603 | { | |
4604 | /* if this is an APPEND route, then rt points to the first route | |
4605 | * inserted and rt_last points to last route inserted. Userspace | |
4606 | * wants a consistent dump of the route which starts at the first | |
4607 | * nexthop. Since sibling routes are always added at the end of | |
4608 | * the list, find the first sibling of the last route appended | |
4609 | */ | |
93c2fb25 DA |
4610 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) { |
4611 | rt = list_first_entry(&rt_last->fib6_siblings, | |
8d1c802b | 4612 | struct fib6_info, |
93c2fb25 | 4613 | fib6_siblings); |
3b1137fe DA |
4614 | } |
4615 | ||
4616 | if (rt) | |
4617 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
4618 | } | |
4619 | ||
333c4301 DA |
4620 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
4621 | struct netlink_ext_ack *extack) | |
51ebd318 | 4622 | { |
8d1c802b | 4623 | struct fib6_info *rt_notif = NULL, *rt_last = NULL; |
3b1137fe | 4624 | struct nl_info *info = &cfg->fc_nlinfo; |
51ebd318 ND |
4625 | struct fib6_config r_cfg; |
4626 | struct rtnexthop *rtnh; | |
8d1c802b | 4627 | struct fib6_info *rt; |
6b9ea5a6 RP |
4628 | struct rt6_nh *err_nh; |
4629 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 4630 | __u16 nlflags; |
51ebd318 ND |
4631 | int remaining; |
4632 | int attrlen; | |
6b9ea5a6 RP |
4633 | int err = 1; |
4634 | int nhn = 0; | |
4635 | int replace = (cfg->fc_nlinfo.nlh && | |
4636 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
4637 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 4638 | |
3b1137fe DA |
4639 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
4640 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
4641 | nlflags |= NLM_F_APPEND; | |
4642 | ||
35f1b4e9 | 4643 | remaining = cfg->fc_mp_len; |
51ebd318 | 4644 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 4645 | |
6b9ea5a6 | 4646 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
8d1c802b | 4647 | * fib6_info structs per nexthop |
6b9ea5a6 | 4648 | */ |
51ebd318 ND |
4649 | while (rtnh_ok(rtnh, remaining)) { |
4650 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
4651 | if (rtnh->rtnh_ifindex) | |
4652 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
4653 | ||
4654 | attrlen = rtnh_attrlen(rtnh); | |
4655 | if (attrlen > 0) { | |
4656 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
4657 | ||
4658 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
4659 | if (nla) { | |
67b61f6c | 4660 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
4661 | r_cfg.fc_flags |= RTF_GATEWAY; |
4662 | } | |
19e42e45 RP |
4663 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
4664 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
4665 | if (nla) | |
4666 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 4667 | } |
6b9ea5a6 | 4668 | |
68e2ffde | 4669 | r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK); |
acb54e3c | 4670 | rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack); |
8c5b83f0 RP |
4671 | if (IS_ERR(rt)) { |
4672 | err = PTR_ERR(rt); | |
4673 | rt = NULL; | |
6b9ea5a6 | 4674 | goto cleanup; |
8c5b83f0 | 4675 | } |
b5d2d75e DA |
4676 | if (!rt6_qualify_for_ecmp(rt)) { |
4677 | err = -EINVAL; | |
4678 | NL_SET_ERR_MSG(extack, | |
4679 | "Device only routes can not be added for IPv6 using the multipath API."); | |
4680 | fib6_info_release(rt); | |
4681 | goto cleanup; | |
4682 | } | |
6b9ea5a6 | 4683 | |
1cf844c7 | 4684 | rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1; |
398958ae | 4685 | |
d4ead6b3 DA |
4686 | err = ip6_route_info_append(info->nl_net, &rt6_nh_list, |
4687 | rt, &r_cfg); | |
51ebd318 | 4688 | if (err) { |
93531c67 | 4689 | fib6_info_release(rt); |
6b9ea5a6 RP |
4690 | goto cleanup; |
4691 | } | |
4692 | ||
4693 | rtnh = rtnh_next(rtnh, &remaining); | |
4694 | } | |
4695 | ||
3b1137fe DA |
4696 | /* for add and replace send one notification with all nexthops. |
4697 | * Skip the notification in fib6_add_rt2node and send one with | |
4698 | * the full route when done | |
4699 | */ | |
4700 | info->skip_notify = 1; | |
4701 | ||
6b9ea5a6 RP |
4702 | err_nh = NULL; |
4703 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
8d1c802b DA |
4704 | err = __ip6_ins_rt(nh->fib6_info, info, extack); |
4705 | fib6_info_release(nh->fib6_info); | |
93531c67 | 4706 | |
f7225172 DA |
4707 | if (!err) { |
4708 | /* save reference to last route successfully inserted */ | |
4709 | rt_last = nh->fib6_info; | |
4710 | ||
4711 | /* save reference to first route for notification */ | |
4712 | if (!rt_notif) | |
4713 | rt_notif = nh->fib6_info; | |
4714 | } | |
3b1137fe | 4715 | |
8d1c802b DA |
4716 | /* nh->fib6_info is used or freed at this point, reset to NULL*/ |
4717 | nh->fib6_info = NULL; | |
6b9ea5a6 RP |
4718 | if (err) { |
4719 | if (replace && nhn) | |
a5a82d84 JK |
4720 | NL_SET_ERR_MSG_MOD(extack, |
4721 | "multipath route replace failed (check consistency of installed routes)"); | |
6b9ea5a6 RP |
4722 | err_nh = nh; |
4723 | goto add_errout; | |
51ebd318 | 4724 | } |
6b9ea5a6 | 4725 | |
1a72418b | 4726 | /* Because each route is added like a single route we remove |
27596472 MK |
4727 | * these flags after the first nexthop: if there is a collision, |
4728 | * we have already failed to add the first nexthop: | |
4729 | * fib6_add_rt2node() has rejected it; when replacing, old | |
4730 | * nexthops have been replaced by first new, the rest should | |
4731 | * be added to it. | |
1a72418b | 4732 | */ |
27596472 MK |
4733 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
4734 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
4735 | nhn++; |
4736 | } | |
4737 | ||
3b1137fe DA |
4738 | /* success ... tell user about new route */ |
4739 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
4740 | goto cleanup; |
4741 | ||
4742 | add_errout: | |
3b1137fe DA |
4743 | /* send notification for routes that were added so that |
4744 | * the delete notifications sent by ip6_route_del are | |
4745 | * coherent | |
4746 | */ | |
4747 | if (rt_notif) | |
4748 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
4749 | ||
6b9ea5a6 RP |
4750 | /* Delete routes that were already added */ |
4751 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
4752 | if (err_nh == nh) | |
4753 | break; | |
333c4301 | 4754 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
4755 | } |
4756 | ||
4757 | cleanup: | |
4758 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
8d1c802b DA |
4759 | if (nh->fib6_info) |
4760 | fib6_info_release(nh->fib6_info); | |
6b9ea5a6 RP |
4761 | list_del(&nh->next); |
4762 | kfree(nh); | |
4763 | } | |
4764 | ||
4765 | return err; | |
4766 | } | |
4767 | ||
333c4301 DA |
4768 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
4769 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
4770 | { |
4771 | struct fib6_config r_cfg; | |
4772 | struct rtnexthop *rtnh; | |
4773 | int remaining; | |
4774 | int attrlen; | |
4775 | int err = 1, last_err = 0; | |
4776 | ||
4777 | remaining = cfg->fc_mp_len; | |
4778 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
4779 | ||
4780 | /* Parse a Multipath Entry */ | |
4781 | while (rtnh_ok(rtnh, remaining)) { | |
4782 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
4783 | if (rtnh->rtnh_ifindex) | |
4784 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
4785 | ||
4786 | attrlen = rtnh_attrlen(rtnh); | |
4787 | if (attrlen > 0) { | |
4788 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
4789 | ||
4790 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
4791 | if (nla) { | |
4792 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
4793 | r_cfg.fc_flags |= RTF_GATEWAY; | |
4794 | } | |
4795 | } | |
333c4301 | 4796 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
4797 | if (err) |
4798 | last_err = err; | |
4799 | ||
51ebd318 ND |
4800 | rtnh = rtnh_next(rtnh, &remaining); |
4801 | } | |
4802 | ||
4803 | return last_err; | |
4804 | } | |
4805 | ||
c21ef3e3 DA |
4806 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
4807 | struct netlink_ext_ack *extack) | |
1da177e4 | 4808 | { |
86872cb5 TG |
4809 | struct fib6_config cfg; |
4810 | int err; | |
1da177e4 | 4811 | |
333c4301 | 4812 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
4813 | if (err < 0) |
4814 | return err; | |
4815 | ||
51ebd318 | 4816 | if (cfg.fc_mp) |
333c4301 | 4817 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
4818 | else { |
4819 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 4820 | return ip6_route_del(&cfg, extack); |
0ae81335 | 4821 | } |
1da177e4 LT |
4822 | } |
4823 | ||
c21ef3e3 DA |
4824 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
4825 | struct netlink_ext_ack *extack) | |
1da177e4 | 4826 | { |
86872cb5 TG |
4827 | struct fib6_config cfg; |
4828 | int err; | |
1da177e4 | 4829 | |
333c4301 | 4830 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
4831 | if (err < 0) |
4832 | return err; | |
4833 | ||
67f69513 DA |
4834 | if (cfg.fc_metric == 0) |
4835 | cfg.fc_metric = IP6_RT_PRIO_USER; | |
4836 | ||
51ebd318 | 4837 | if (cfg.fc_mp) |
333c4301 | 4838 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 4839 | else |
acb54e3c | 4840 | return ip6_route_add(&cfg, GFP_KERNEL, extack); |
1da177e4 LT |
4841 | } |
4842 | ||
8d1c802b | 4843 | static size_t rt6_nlmsg_size(struct fib6_info *rt) |
339bf98f | 4844 | { |
beb1afac DA |
4845 | int nexthop_len = 0; |
4846 | ||
f88d8ea6 DA |
4847 | if (rt->nh) |
4848 | nexthop_len += nla_total_size(4); /* RTA_NH_ID */ | |
4849 | ||
93c2fb25 | 4850 | if (rt->fib6_nsiblings) { |
beb1afac DA |
4851 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ |
4852 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
4853 | + nla_total_size(16) /* RTA_GATEWAY */ | |
1cf844c7 | 4854 | + lwtunnel_get_encap_size(rt->fib6_nh->fib_nh_lws); |
beb1afac | 4855 | |
93c2fb25 | 4856 | nexthop_len *= rt->fib6_nsiblings; |
beb1afac DA |
4857 | } |
4858 | ||
339bf98f TG |
4859 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
4860 | + nla_total_size(16) /* RTA_SRC */ | |
4861 | + nla_total_size(16) /* RTA_DST */ | |
4862 | + nla_total_size(16) /* RTA_GATEWAY */ | |
4863 | + nla_total_size(16) /* RTA_PREFSRC */ | |
4864 | + nla_total_size(4) /* RTA_TABLE */ | |
4865 | + nla_total_size(4) /* RTA_IIF */ | |
4866 | + nla_total_size(4) /* RTA_OIF */ | |
4867 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 4868 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 4869 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 4870 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 4871 | + nla_total_size(1) /* RTA_PREF */ |
1cf844c7 | 4872 | + lwtunnel_get_encap_size(rt->fib6_nh->fib_nh_lws) |
beb1afac DA |
4873 | + nexthop_len; |
4874 | } | |
4875 | ||
f88d8ea6 DA |
4876 | static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh, |
4877 | unsigned char *flags) | |
4878 | { | |
4879 | if (nexthop_is_multipath(nh)) { | |
4880 | struct nlattr *mp; | |
4881 | ||
4882 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
4883 | if (!mp) | |
4884 | goto nla_put_failure; | |
4885 | ||
4886 | if (nexthop_mpath_fill_node(skb, nh)) | |
4887 | goto nla_put_failure; | |
4888 | ||
4889 | nla_nest_end(skb, mp); | |
4890 | } else { | |
4891 | struct fib6_nh *fib6_nh; | |
4892 | ||
4893 | fib6_nh = nexthop_fib6_nh(nh); | |
4894 | if (fib_nexthop_info(skb, &fib6_nh->nh_common, | |
4895 | flags, false) < 0) | |
4896 | goto nla_put_failure; | |
4897 | } | |
4898 | ||
4899 | return 0; | |
4900 | ||
4901 | nla_put_failure: | |
4902 | return -EMSGSIZE; | |
4903 | } | |
4904 | ||
d4ead6b3 | 4905 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 4906 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 4907 | struct in6_addr *dest, struct in6_addr *src, |
15e47304 | 4908 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 4909 | unsigned int flags) |
1da177e4 | 4910 | { |
22d0bd82 XL |
4911 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
4912 | struct rt6key *rt6_dst, *rt6_src; | |
4913 | u32 *pmetrics, table, rt6_flags; | |
f88d8ea6 | 4914 | unsigned char nh_flags = 0; |
2d7202bf | 4915 | struct nlmsghdr *nlh; |
22d0bd82 | 4916 | struct rtmsg *rtm; |
d4ead6b3 | 4917 | long expires = 0; |
1da177e4 | 4918 | |
15e47304 | 4919 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 4920 | if (!nlh) |
26932566 | 4921 | return -EMSGSIZE; |
2d7202bf | 4922 | |
22d0bd82 XL |
4923 | if (rt6) { |
4924 | rt6_dst = &rt6->rt6i_dst; | |
4925 | rt6_src = &rt6->rt6i_src; | |
4926 | rt6_flags = rt6->rt6i_flags; | |
4927 | } else { | |
4928 | rt6_dst = &rt->fib6_dst; | |
4929 | rt6_src = &rt->fib6_src; | |
4930 | rt6_flags = rt->fib6_flags; | |
4931 | } | |
4932 | ||
2d7202bf | 4933 | rtm = nlmsg_data(nlh); |
1da177e4 | 4934 | rtm->rtm_family = AF_INET6; |
22d0bd82 XL |
4935 | rtm->rtm_dst_len = rt6_dst->plen; |
4936 | rtm->rtm_src_len = rt6_src->plen; | |
1da177e4 | 4937 | rtm->rtm_tos = 0; |
93c2fb25 DA |
4938 | if (rt->fib6_table) |
4939 | table = rt->fib6_table->tb6_id; | |
c71099ac | 4940 | else |
9e762a4a | 4941 | table = RT6_TABLE_UNSPEC; |
97f0082a | 4942 | rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT; |
c78679e8 DM |
4943 | if (nla_put_u32(skb, RTA_TABLE, table)) |
4944 | goto nla_put_failure; | |
e8478e80 DA |
4945 | |
4946 | rtm->rtm_type = rt->fib6_type; | |
1da177e4 LT |
4947 | rtm->rtm_flags = 0; |
4948 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
93c2fb25 | 4949 | rtm->rtm_protocol = rt->fib6_protocol; |
1da177e4 | 4950 | |
22d0bd82 | 4951 | if (rt6_flags & RTF_CACHE) |
1da177e4 LT |
4952 | rtm->rtm_flags |= RTM_F_CLONED; |
4953 | ||
d4ead6b3 DA |
4954 | if (dest) { |
4955 | if (nla_put_in6_addr(skb, RTA_DST, dest)) | |
c78679e8 | 4956 | goto nla_put_failure; |
1ab1457c | 4957 | rtm->rtm_dst_len = 128; |
1da177e4 | 4958 | } else if (rtm->rtm_dst_len) |
22d0bd82 | 4959 | if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr)) |
c78679e8 | 4960 | goto nla_put_failure; |
1da177e4 LT |
4961 | #ifdef CONFIG_IPV6_SUBTREES |
4962 | if (src) { | |
930345ea | 4963 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 4964 | goto nla_put_failure; |
1ab1457c | 4965 | rtm->rtm_src_len = 128; |
c78679e8 | 4966 | } else if (rtm->rtm_src_len && |
22d0bd82 | 4967 | nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr)) |
c78679e8 | 4968 | goto nla_put_failure; |
1da177e4 | 4969 | #endif |
7bc570c8 YH |
4970 | if (iif) { |
4971 | #ifdef CONFIG_IPV6_MROUTE | |
22d0bd82 | 4972 | if (ipv6_addr_is_multicast(&rt6_dst->addr)) { |
fd61c6ba DA |
4973 | int err = ip6mr_get_route(net, skb, rtm, portid); |
4974 | ||
4975 | if (err == 0) | |
4976 | return 0; | |
4977 | if (err < 0) | |
4978 | goto nla_put_failure; | |
7bc570c8 YH |
4979 | } else |
4980 | #endif | |
c78679e8 DM |
4981 | if (nla_put_u32(skb, RTA_IIF, iif)) |
4982 | goto nla_put_failure; | |
d4ead6b3 | 4983 | } else if (dest) { |
1da177e4 | 4984 | struct in6_addr saddr_buf; |
d4ead6b3 | 4985 | if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && |
930345ea | 4986 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 4987 | goto nla_put_failure; |
1da177e4 | 4988 | } |
2d7202bf | 4989 | |
93c2fb25 | 4990 | if (rt->fib6_prefsrc.plen) { |
c3968a85 | 4991 | struct in6_addr saddr_buf; |
93c2fb25 | 4992 | saddr_buf = rt->fib6_prefsrc.addr; |
930345ea | 4993 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 4994 | goto nla_put_failure; |
c3968a85 DW |
4995 | } |
4996 | ||
d4ead6b3 DA |
4997 | pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics; |
4998 | if (rtnetlink_put_metrics(skb, pmetrics) < 0) | |
2d7202bf TG |
4999 | goto nla_put_failure; |
5000 | ||
93c2fb25 | 5001 | if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric)) |
c78679e8 | 5002 | goto nla_put_failure; |
8253947e | 5003 | |
beb1afac DA |
5004 | /* For multipath routes, walk the siblings list and add |
5005 | * each as a nexthop within RTA_MULTIPATH. | |
5006 | */ | |
22d0bd82 XL |
5007 | if (rt6) { |
5008 | if (rt6_flags & RTF_GATEWAY && | |
5009 | nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway)) | |
5010 | goto nla_put_failure; | |
5011 | ||
5012 | if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex)) | |
5013 | goto nla_put_failure; | |
5014 | } else if (rt->fib6_nsiblings) { | |
8d1c802b | 5015 | struct fib6_info *sibling, *next_sibling; |
beb1afac DA |
5016 | struct nlattr *mp; |
5017 | ||
ae0be8de | 5018 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
beb1afac DA |
5019 | if (!mp) |
5020 | goto nla_put_failure; | |
5021 | ||
1cf844c7 DA |
5022 | if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common, |
5023 | rt->fib6_nh->fib_nh_weight) < 0) | |
beb1afac DA |
5024 | goto nla_put_failure; |
5025 | ||
5026 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 | 5027 | &rt->fib6_siblings, fib6_siblings) { |
1cf844c7 DA |
5028 | if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common, |
5029 | sibling->fib6_nh->fib_nh_weight) < 0) | |
beb1afac DA |
5030 | goto nla_put_failure; |
5031 | } | |
5032 | ||
5033 | nla_nest_end(skb, mp); | |
f88d8ea6 DA |
5034 | } else if (rt->nh) { |
5035 | if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id)) | |
5036 | goto nla_put_failure; | |
ecc5663c | 5037 | |
f88d8ea6 DA |
5038 | if (nexthop_is_blackhole(rt->nh)) |
5039 | rtm->rtm_type = RTN_BLACKHOLE; | |
5040 | ||
5041 | if (rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0) | |
5042 | goto nla_put_failure; | |
5043 | ||
5044 | rtm->rtm_flags |= nh_flags; | |
5045 | } else { | |
1cf844c7 | 5046 | if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, |
ecc5663c | 5047 | &nh_flags, false) < 0) |
beb1afac | 5048 | goto nla_put_failure; |
ecc5663c DA |
5049 | |
5050 | rtm->rtm_flags |= nh_flags; | |
beb1afac DA |
5051 | } |
5052 | ||
22d0bd82 | 5053 | if (rt6_flags & RTF_EXPIRES) { |
14895687 DA |
5054 | expires = dst ? dst->expires : rt->expires; |
5055 | expires -= jiffies; | |
5056 | } | |
69cdf8f9 | 5057 | |
d4ead6b3 | 5058 | if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0) |
e3703b3d | 5059 | goto nla_put_failure; |
2d7202bf | 5060 | |
22d0bd82 | 5061 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags))) |
c78ba6d6 LR |
5062 | goto nla_put_failure; |
5063 | ||
19e42e45 | 5064 | |
053c095a JB |
5065 | nlmsg_end(skb, nlh); |
5066 | return 0; | |
2d7202bf TG |
5067 | |
5068 | nla_put_failure: | |
26932566 PM |
5069 | nlmsg_cancel(skb, nlh); |
5070 | return -EMSGSIZE; | |
1da177e4 LT |
5071 | } |
5072 | ||
13e38901 DA |
5073 | static bool fib6_info_uses_dev(const struct fib6_info *f6i, |
5074 | const struct net_device *dev) | |
5075 | { | |
1cf844c7 | 5076 | if (f6i->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5077 | return true; |
5078 | ||
5079 | if (f6i->fib6_nsiblings) { | |
5080 | struct fib6_info *sibling, *next_sibling; | |
5081 | ||
5082 | list_for_each_entry_safe(sibling, next_sibling, | |
5083 | &f6i->fib6_siblings, fib6_siblings) { | |
1cf844c7 | 5084 | if (sibling->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5085 | return true; |
5086 | } | |
5087 | } | |
5088 | ||
5089 | return false; | |
5090 | } | |
5091 | ||
8d1c802b | 5092 | int rt6_dump_route(struct fib6_info *rt, void *p_arg) |
1da177e4 LT |
5093 | { |
5094 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
13e38901 DA |
5095 | struct fib_dump_filter *filter = &arg->filter; |
5096 | unsigned int flags = NLM_F_MULTI; | |
1f17e2f2 DA |
5097 | struct net *net = arg->net; |
5098 | ||
421842ed | 5099 | if (rt == net->ipv6.fib6_null_entry) |
1f17e2f2 | 5100 | return 0; |
1da177e4 | 5101 | |
13e38901 DA |
5102 | if ((filter->flags & RTM_F_PREFIX) && |
5103 | !(rt->fib6_flags & RTF_PREFIX_RT)) { | |
5104 | /* success since this is not a prefix route */ | |
5105 | return 1; | |
5106 | } | |
5107 | if (filter->filter_set) { | |
5108 | if ((filter->rt_type && rt->fib6_type != filter->rt_type) || | |
5109 | (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) || | |
5110 | (filter->protocol && rt->fib6_protocol != filter->protocol)) { | |
f8cfe2ce DA |
5111 | return 1; |
5112 | } | |
13e38901 | 5113 | flags |= NLM_F_DUMP_FILTERED; |
f8cfe2ce | 5114 | } |
1da177e4 | 5115 | |
d4ead6b3 DA |
5116 | return rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, 0, |
5117 | RTM_NEWROUTE, NETLINK_CB(arg->cb->skb).portid, | |
13e38901 | 5118 | arg->cb->nlh->nlmsg_seq, flags); |
1da177e4 LT |
5119 | } |
5120 | ||
0eff0a27 JK |
5121 | static int inet6_rtm_valid_getroute_req(struct sk_buff *skb, |
5122 | const struct nlmsghdr *nlh, | |
5123 | struct nlattr **tb, | |
5124 | struct netlink_ext_ack *extack) | |
5125 | { | |
5126 | struct rtmsg *rtm; | |
5127 | int i, err; | |
5128 | ||
5129 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
5130 | NL_SET_ERR_MSG_MOD(extack, | |
5131 | "Invalid header for get route request"); | |
5132 | return -EINVAL; | |
5133 | } | |
5134 | ||
5135 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
5136 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5137 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5138 | |
5139 | rtm = nlmsg_data(nlh); | |
5140 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || | |
5141 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || | |
5142 | rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || | |
5143 | rtm->rtm_type) { | |
5144 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
5145 | return -EINVAL; | |
5146 | } | |
5147 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
5148 | NL_SET_ERR_MSG_MOD(extack, | |
5149 | "Invalid flags for get route request"); | |
5150 | return -EINVAL; | |
5151 | } | |
5152 | ||
8cb08174 JB |
5153 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
5154 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5155 | if (err) |
5156 | return err; | |
5157 | ||
5158 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
5159 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
5160 | NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); | |
5161 | return -EINVAL; | |
5162 | } | |
5163 | ||
5164 | for (i = 0; i <= RTA_MAX; i++) { | |
5165 | if (!tb[i]) | |
5166 | continue; | |
5167 | ||
5168 | switch (i) { | |
5169 | case RTA_SRC: | |
5170 | case RTA_DST: | |
5171 | case RTA_IIF: | |
5172 | case RTA_OIF: | |
5173 | case RTA_MARK: | |
5174 | case RTA_UID: | |
5175 | case RTA_SPORT: | |
5176 | case RTA_DPORT: | |
5177 | case RTA_IP_PROTO: | |
5178 | break; | |
5179 | default: | |
5180 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
5181 | return -EINVAL; | |
5182 | } | |
5183 | } | |
5184 | ||
5185 | return 0; | |
5186 | } | |
5187 | ||
c21ef3e3 DA |
5188 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
5189 | struct netlink_ext_ack *extack) | |
1da177e4 | 5190 | { |
3b1e0a65 | 5191 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 5192 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c | 5193 | int err, iif = 0, oif = 0; |
a68886a6 | 5194 | struct fib6_info *from; |
18c3a61c | 5195 | struct dst_entry *dst; |
ab364a6f | 5196 | struct rt6_info *rt; |
1da177e4 | 5197 | struct sk_buff *skb; |
ab364a6f | 5198 | struct rtmsg *rtm; |
744486d4 | 5199 | struct flowi6 fl6 = {}; |
18c3a61c | 5200 | bool fibmatch; |
1da177e4 | 5201 | |
0eff0a27 | 5202 | err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
ab364a6f TG |
5203 | if (err < 0) |
5204 | goto errout; | |
1da177e4 | 5205 | |
ab364a6f | 5206 | err = -EINVAL; |
38b7097b HFS |
5207 | rtm = nlmsg_data(nlh); |
5208 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 5209 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 5210 | |
ab364a6f TG |
5211 | if (tb[RTA_SRC]) { |
5212 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
5213 | goto errout; | |
5214 | ||
4e3fd7a0 | 5215 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
5216 | } |
5217 | ||
5218 | if (tb[RTA_DST]) { | |
5219 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
5220 | goto errout; | |
5221 | ||
4e3fd7a0 | 5222 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
5223 | } |
5224 | ||
5225 | if (tb[RTA_IIF]) | |
5226 | iif = nla_get_u32(tb[RTA_IIF]); | |
5227 | ||
5228 | if (tb[RTA_OIF]) | |
72331bc0 | 5229 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 5230 | |
2e47b291 LC |
5231 | if (tb[RTA_MARK]) |
5232 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
5233 | ||
622ec2c9 LC |
5234 | if (tb[RTA_UID]) |
5235 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
5236 | nla_get_u32(tb[RTA_UID])); | |
5237 | else | |
5238 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
5239 | ||
eacb9384 RP |
5240 | if (tb[RTA_SPORT]) |
5241 | fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]); | |
5242 | ||
5243 | if (tb[RTA_DPORT]) | |
5244 | fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]); | |
5245 | ||
5246 | if (tb[RTA_IP_PROTO]) { | |
5247 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea HL |
5248 | &fl6.flowi6_proto, AF_INET6, |
5249 | extack); | |
eacb9384 RP |
5250 | if (err) |
5251 | goto errout; | |
5252 | } | |
5253 | ||
1da177e4 LT |
5254 | if (iif) { |
5255 | struct net_device *dev; | |
72331bc0 SL |
5256 | int flags = 0; |
5257 | ||
121622db FW |
5258 | rcu_read_lock(); |
5259 | ||
5260 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 5261 | if (!dev) { |
121622db | 5262 | rcu_read_unlock(); |
1da177e4 | 5263 | err = -ENODEV; |
ab364a6f | 5264 | goto errout; |
1da177e4 | 5265 | } |
72331bc0 SL |
5266 | |
5267 | fl6.flowi6_iif = iif; | |
5268 | ||
5269 | if (!ipv6_addr_any(&fl6.saddr)) | |
5270 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
5271 | ||
b75cc8f9 | 5272 | dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags); |
121622db FW |
5273 | |
5274 | rcu_read_unlock(); | |
72331bc0 SL |
5275 | } else { |
5276 | fl6.flowi6_oif = oif; | |
5277 | ||
58acfd71 | 5278 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
5279 | } |
5280 | ||
18c3a61c RP |
5281 | |
5282 | rt = container_of(dst, struct rt6_info, dst); | |
5283 | if (rt->dst.error) { | |
5284 | err = rt->dst.error; | |
5285 | ip6_rt_put(rt); | |
5286 | goto errout; | |
1da177e4 LT |
5287 | } |
5288 | ||
9d6acb3b WC |
5289 | if (rt == net->ipv6.ip6_null_entry) { |
5290 | err = rt->dst.error; | |
5291 | ip6_rt_put(rt); | |
5292 | goto errout; | |
5293 | } | |
5294 | ||
ab364a6f | 5295 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 5296 | if (!skb) { |
94e187c0 | 5297 | ip6_rt_put(rt); |
ab364a6f TG |
5298 | err = -ENOBUFS; |
5299 | goto errout; | |
5300 | } | |
1da177e4 | 5301 | |
d8d1f30b | 5302 | skb_dst_set(skb, &rt->dst); |
a68886a6 DA |
5303 | |
5304 | rcu_read_lock(); | |
5305 | from = rcu_dereference(rt->from); | |
886b7a50 MKL |
5306 | if (from) { |
5307 | if (fibmatch) | |
5308 | err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, | |
5309 | iif, RTM_NEWROUTE, | |
5310 | NETLINK_CB(in_skb).portid, | |
5311 | nlh->nlmsg_seq, 0); | |
5312 | else | |
5313 | err = rt6_fill_node(net, skb, from, dst, &fl6.daddr, | |
5314 | &fl6.saddr, iif, RTM_NEWROUTE, | |
5315 | NETLINK_CB(in_skb).portid, | |
5316 | nlh->nlmsg_seq, 0); | |
5317 | } else { | |
5318 | err = -ENETUNREACH; | |
5319 | } | |
a68886a6 DA |
5320 | rcu_read_unlock(); |
5321 | ||
1da177e4 | 5322 | if (err < 0) { |
ab364a6f TG |
5323 | kfree_skb(skb); |
5324 | goto errout; | |
1da177e4 LT |
5325 | } |
5326 | ||
15e47304 | 5327 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 5328 | errout: |
1da177e4 | 5329 | return err; |
1da177e4 LT |
5330 | } |
5331 | ||
8d1c802b | 5332 | void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info, |
37a1d361 | 5333 | unsigned int nlm_flags) |
1da177e4 LT |
5334 | { |
5335 | struct sk_buff *skb; | |
5578689a | 5336 | struct net *net = info->nl_net; |
528c4ceb DL |
5337 | u32 seq; |
5338 | int err; | |
5339 | ||
5340 | err = -ENOBUFS; | |
38308473 | 5341 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 5342 | |
19e42e45 | 5343 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 5344 | if (!skb) |
21713ebc TG |
5345 | goto errout; |
5346 | ||
d4ead6b3 DA |
5347 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, |
5348 | event, info->portid, seq, nlm_flags); | |
26932566 PM |
5349 | if (err < 0) { |
5350 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
5351 | WARN_ON(err == -EMSGSIZE); | |
5352 | kfree_skb(skb); | |
5353 | goto errout; | |
5354 | } | |
15e47304 | 5355 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
5356 | info->nlh, gfp_any()); |
5357 | return; | |
21713ebc TG |
5358 | errout: |
5359 | if (err < 0) | |
5578689a | 5360 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
5361 | } |
5362 | ||
19a3b7ee DA |
5363 | void fib6_rt_update(struct net *net, struct fib6_info *rt, |
5364 | struct nl_info *info) | |
5365 | { | |
5366 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
5367 | struct sk_buff *skb; | |
5368 | int err = -ENOBUFS; | |
5369 | ||
5370 | /* call_fib6_entry_notifiers will be removed when in-kernel notifier | |
5371 | * is implemented and supported for nexthop objects | |
5372 | */ | |
5373 | call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL); | |
5374 | ||
5375 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
5376 | if (!skb) | |
5377 | goto errout; | |
5378 | ||
5379 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, | |
5380 | RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE); | |
5381 | if (err < 0) { | |
5382 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
5383 | WARN_ON(err == -EMSGSIZE); | |
5384 | kfree_skb(skb); | |
5385 | goto errout; | |
5386 | } | |
5387 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, | |
5388 | info->nlh, gfp_any()); | |
5389 | return; | |
5390 | errout: | |
5391 | if (err < 0) | |
5392 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
5393 | } | |
5394 | ||
8ed67789 | 5395 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 5396 | unsigned long event, void *ptr) |
8ed67789 | 5397 | { |
351638e7 | 5398 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 5399 | struct net *net = dev_net(dev); |
8ed67789 | 5400 | |
242d3a49 WC |
5401 | if (!(dev->flags & IFF_LOOPBACK)) |
5402 | return NOTIFY_OK; | |
5403 | ||
5404 | if (event == NETDEV_REGISTER) { | |
1cf844c7 | 5405 | net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev; |
d8d1f30b | 5406 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
5407 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
5408 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 5409 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 5410 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 5411 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 5412 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 5413 | #endif |
76da0704 WC |
5414 | } else if (event == NETDEV_UNREGISTER && |
5415 | dev->reg_state != NETREG_UNREGISTERED) { | |
5416 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
5417 | * netdev_wait_allrefs(). Make sure we only call this once. | |
5418 | */ | |
12d94a80 | 5419 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 5420 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
5421 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
5422 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
5423 | #endif |
5424 | } | |
5425 | ||
5426 | return NOTIFY_OK; | |
5427 | } | |
5428 | ||
1da177e4 LT |
5429 | /* |
5430 | * /proc | |
5431 | */ | |
5432 | ||
5433 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
5434 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
5435 | { | |
69ddb805 | 5436 | struct net *net = (struct net *)seq->private; |
1da177e4 | 5437 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
5438 | net->ipv6.rt6_stats->fib_nodes, |
5439 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 5440 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
5441 | net->ipv6.rt6_stats->fib_rt_entries, |
5442 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 5443 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 5444 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
5445 | |
5446 | return 0; | |
5447 | } | |
1da177e4 LT |
5448 | #endif /* CONFIG_PROC_FS */ |
5449 | ||
5450 | #ifdef CONFIG_SYSCTL | |
5451 | ||
1da177e4 | 5452 | static |
fe2c6338 | 5453 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
5454 | void __user *buffer, size_t *lenp, loff_t *ppos) |
5455 | { | |
c486da34 LAG |
5456 | struct net *net; |
5457 | int delay; | |
f0fb9b28 | 5458 | int ret; |
c486da34 | 5459 | if (!write) |
1da177e4 | 5460 | return -EINVAL; |
c486da34 LAG |
5461 | |
5462 | net = (struct net *)ctl->extra1; | |
5463 | delay = net->ipv6.sysctl.flush_delay; | |
f0fb9b28 AP |
5464 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
5465 | if (ret) | |
5466 | return ret; | |
5467 | ||
2ac3ac8f | 5468 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 5469 | return 0; |
1da177e4 LT |
5470 | } |
5471 | ||
7c6bb7d2 DA |
5472 | static int zero; |
5473 | static int one = 1; | |
5474 | ||
ed792e28 | 5475 | static struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 5476 | { |
1da177e4 | 5477 | .procname = "flush", |
4990509f | 5478 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 5479 | .maxlen = sizeof(int), |
89c8b3a1 | 5480 | .mode = 0200, |
6d9f239a | 5481 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
5482 | }, |
5483 | { | |
1da177e4 | 5484 | .procname = "gc_thresh", |
9a7ec3a9 | 5485 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
5486 | .maxlen = sizeof(int), |
5487 | .mode = 0644, | |
6d9f239a | 5488 | .proc_handler = proc_dointvec, |
1da177e4 LT |
5489 | }, |
5490 | { | |
1da177e4 | 5491 | .procname = "max_size", |
4990509f | 5492 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
5493 | .maxlen = sizeof(int), |
5494 | .mode = 0644, | |
6d9f239a | 5495 | .proc_handler = proc_dointvec, |
1da177e4 LT |
5496 | }, |
5497 | { | |
1da177e4 | 5498 | .procname = "gc_min_interval", |
4990509f | 5499 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
5500 | .maxlen = sizeof(int), |
5501 | .mode = 0644, | |
6d9f239a | 5502 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
5503 | }, |
5504 | { | |
1da177e4 | 5505 | .procname = "gc_timeout", |
4990509f | 5506 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
5507 | .maxlen = sizeof(int), |
5508 | .mode = 0644, | |
6d9f239a | 5509 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
5510 | }, |
5511 | { | |
1da177e4 | 5512 | .procname = "gc_interval", |
4990509f | 5513 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
5514 | .maxlen = sizeof(int), |
5515 | .mode = 0644, | |
6d9f239a | 5516 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
5517 | }, |
5518 | { | |
1da177e4 | 5519 | .procname = "gc_elasticity", |
4990509f | 5520 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
5521 | .maxlen = sizeof(int), |
5522 | .mode = 0644, | |
f3d3f616 | 5523 | .proc_handler = proc_dointvec, |
1da177e4 LT |
5524 | }, |
5525 | { | |
1da177e4 | 5526 | .procname = "mtu_expires", |
4990509f | 5527 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
5528 | .maxlen = sizeof(int), |
5529 | .mode = 0644, | |
6d9f239a | 5530 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
5531 | }, |
5532 | { | |
1da177e4 | 5533 | .procname = "min_adv_mss", |
4990509f | 5534 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
5535 | .maxlen = sizeof(int), |
5536 | .mode = 0644, | |
f3d3f616 | 5537 | .proc_handler = proc_dointvec, |
1da177e4 LT |
5538 | }, |
5539 | { | |
1da177e4 | 5540 | .procname = "gc_min_interval_ms", |
4990509f | 5541 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
5542 | .maxlen = sizeof(int), |
5543 | .mode = 0644, | |
6d9f239a | 5544 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 5545 | }, |
7c6bb7d2 DA |
5546 | { |
5547 | .procname = "skip_notify_on_dev_down", | |
5548 | .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down, | |
5549 | .maxlen = sizeof(int), | |
5550 | .mode = 0644, | |
5551 | .proc_handler = proc_dointvec, | |
5552 | .extra1 = &zero, | |
5553 | .extra2 = &one, | |
5554 | }, | |
f8572d8f | 5555 | { } |
1da177e4 LT |
5556 | }; |
5557 | ||
2c8c1e72 | 5558 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
5559 | { |
5560 | struct ctl_table *table; | |
5561 | ||
5562 | table = kmemdup(ipv6_route_table_template, | |
5563 | sizeof(ipv6_route_table_template), | |
5564 | GFP_KERNEL); | |
5ee09105 YH |
5565 | |
5566 | if (table) { | |
5567 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 5568 | table[0].extra1 = net; |
86393e52 | 5569 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
5570 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
5571 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
5572 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
5573 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
5574 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
5575 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
5576 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 5577 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7c6bb7d2 | 5578 | table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down; |
464dc801 EB |
5579 | |
5580 | /* Don't export sysctls to unprivileged users */ | |
5581 | if (net->user_ns != &init_user_ns) | |
5582 | table[0].procname = NULL; | |
5ee09105 YH |
5583 | } |
5584 | ||
760f2d01 DL |
5585 | return table; |
5586 | } | |
1da177e4 LT |
5587 | #endif |
5588 | ||
2c8c1e72 | 5589 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 5590 | { |
633d424b | 5591 | int ret = -ENOMEM; |
8ed67789 | 5592 | |
86393e52 AD |
5593 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
5594 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 5595 | |
fc66f95c ED |
5596 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
5597 | goto out_ip6_dst_ops; | |
5598 | ||
1cf844c7 | 5599 | net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true); |
421842ed DA |
5600 | if (!net->ipv6.fib6_null_entry) |
5601 | goto out_ip6_dst_entries; | |
1cf844c7 DA |
5602 | memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template, |
5603 | sizeof(*net->ipv6.fib6_null_entry)); | |
421842ed | 5604 | |
8ed67789 DL |
5605 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
5606 | sizeof(*net->ipv6.ip6_null_entry), | |
5607 | GFP_KERNEL); | |
5608 | if (!net->ipv6.ip6_null_entry) | |
421842ed | 5609 | goto out_fib6_null_entry; |
d8d1f30b | 5610 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
5611 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
5612 | ip6_template_metrics, true); | |
8ed67789 DL |
5613 | |
5614 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 5615 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
5616 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
5617 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
5618 | GFP_KERNEL); | |
68fffc67 PZ |
5619 | if (!net->ipv6.ip6_prohibit_entry) |
5620 | goto out_ip6_null_entry; | |
d8d1f30b | 5621 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
5622 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
5623 | ip6_template_metrics, true); | |
8ed67789 DL |
5624 | |
5625 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
5626 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
5627 | GFP_KERNEL); | |
68fffc67 PZ |
5628 | if (!net->ipv6.ip6_blk_hole_entry) |
5629 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 5630 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
5631 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
5632 | ip6_template_metrics, true); | |
8ed67789 DL |
5633 | #endif |
5634 | ||
b339a47c PZ |
5635 | net->ipv6.sysctl.flush_delay = 0; |
5636 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
5637 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
5638 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
5639 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
5640 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
5641 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
5642 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
7c6bb7d2 | 5643 | net->ipv6.sysctl.skip_notify_on_dev_down = 0; |
b339a47c | 5644 | |
6891a346 BT |
5645 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
5646 | ||
8ed67789 DL |
5647 | ret = 0; |
5648 | out: | |
5649 | return ret; | |
f2fc6a54 | 5650 | |
68fffc67 PZ |
5651 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
5652 | out_ip6_prohibit_entry: | |
5653 | kfree(net->ipv6.ip6_prohibit_entry); | |
5654 | out_ip6_null_entry: | |
5655 | kfree(net->ipv6.ip6_null_entry); | |
5656 | #endif | |
421842ed DA |
5657 | out_fib6_null_entry: |
5658 | kfree(net->ipv6.fib6_null_entry); | |
fc66f95c ED |
5659 | out_ip6_dst_entries: |
5660 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 5661 | out_ip6_dst_ops: |
f2fc6a54 | 5662 | goto out; |
cdb18761 DL |
5663 | } |
5664 | ||
2c8c1e72 | 5665 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 5666 | { |
421842ed | 5667 | kfree(net->ipv6.fib6_null_entry); |
8ed67789 DL |
5668 | kfree(net->ipv6.ip6_null_entry); |
5669 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
5670 | kfree(net->ipv6.ip6_prohibit_entry); | |
5671 | kfree(net->ipv6.ip6_blk_hole_entry); | |
5672 | #endif | |
41bb78b4 | 5673 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
5674 | } |
5675 | ||
d189634e TG |
5676 | static int __net_init ip6_route_net_init_late(struct net *net) |
5677 | { | |
5678 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
5679 | proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops, |
5680 | sizeof(struct ipv6_route_iter)); | |
3617d949 CH |
5681 | proc_create_net_single("rt6_stats", 0444, net->proc_net, |
5682 | rt6_stats_seq_show, NULL); | |
d189634e TG |
5683 | #endif |
5684 | return 0; | |
5685 | } | |
5686 | ||
5687 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
5688 | { | |
5689 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
5690 | remove_proc_entry("ipv6_route", net->proc_net); |
5691 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
5692 | #endif |
5693 | } | |
5694 | ||
cdb18761 DL |
5695 | static struct pernet_operations ip6_route_net_ops = { |
5696 | .init = ip6_route_net_init, | |
5697 | .exit = ip6_route_net_exit, | |
5698 | }; | |
5699 | ||
c3426b47 DM |
5700 | static int __net_init ipv6_inetpeer_init(struct net *net) |
5701 | { | |
5702 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
5703 | ||
5704 | if (!bp) | |
5705 | return -ENOMEM; | |
5706 | inet_peer_base_init(bp); | |
5707 | net->ipv6.peers = bp; | |
5708 | return 0; | |
5709 | } | |
5710 | ||
5711 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
5712 | { | |
5713 | struct inet_peer_base *bp = net->ipv6.peers; | |
5714 | ||
5715 | net->ipv6.peers = NULL; | |
56a6b248 | 5716 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
5717 | kfree(bp); |
5718 | } | |
5719 | ||
2b823f72 | 5720 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
5721 | .init = ipv6_inetpeer_init, |
5722 | .exit = ipv6_inetpeer_exit, | |
5723 | }; | |
5724 | ||
d189634e TG |
5725 | static struct pernet_operations ip6_route_net_late_ops = { |
5726 | .init = ip6_route_net_init_late, | |
5727 | .exit = ip6_route_net_exit_late, | |
5728 | }; | |
5729 | ||
8ed67789 DL |
5730 | static struct notifier_block ip6_route_dev_notifier = { |
5731 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 5732 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
5733 | }; |
5734 | ||
2f460933 WC |
5735 | void __init ip6_route_init_special_entries(void) |
5736 | { | |
5737 | /* Registering of the loopback is done before this portion of code, | |
5738 | * the loopback reference in rt6_info will not be taken, do it | |
5739 | * manually for init_net */ | |
1cf844c7 | 5740 | init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev; |
2f460933 WC |
5741 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
5742 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
5743 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
5744 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
5745 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
5746 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
5747 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
5748 | #endif | |
5749 | } | |
5750 | ||
433d49c3 | 5751 | int __init ip6_route_init(void) |
1da177e4 | 5752 | { |
433d49c3 | 5753 | int ret; |
8d0b94af | 5754 | int cpu; |
433d49c3 | 5755 | |
9a7ec3a9 DL |
5756 | ret = -ENOMEM; |
5757 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 5758 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 5759 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 5760 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 5761 | goto out; |
14e50e57 | 5762 | |
fc66f95c | 5763 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 5764 | if (ret) |
bdb3289f | 5765 | goto out_kmem_cache; |
bdb3289f | 5766 | |
c3426b47 DM |
5767 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
5768 | if (ret) | |
e8803b6c | 5769 | goto out_dst_entries; |
2a0c451a | 5770 | |
7e52b33b DM |
5771 | ret = register_pernet_subsys(&ip6_route_net_ops); |
5772 | if (ret) | |
5773 | goto out_register_inetpeer; | |
c3426b47 | 5774 | |
5dc121e9 AE |
5775 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
5776 | ||
e8803b6c | 5777 | ret = fib6_init(); |
433d49c3 | 5778 | if (ret) |
8ed67789 | 5779 | goto out_register_subsys; |
433d49c3 | 5780 | |
433d49c3 DL |
5781 | ret = xfrm6_init(); |
5782 | if (ret) | |
e8803b6c | 5783 | goto out_fib6_init; |
c35b7e72 | 5784 | |
433d49c3 DL |
5785 | ret = fib6_rules_init(); |
5786 | if (ret) | |
5787 | goto xfrm6_init; | |
7e5449c2 | 5788 | |
d189634e TG |
5789 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
5790 | if (ret) | |
5791 | goto fib6_rules_init; | |
5792 | ||
16feebcf FW |
5793 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
5794 | inet6_rtm_newroute, NULL, 0); | |
5795 | if (ret < 0) | |
5796 | goto out_register_late_subsys; | |
5797 | ||
5798 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
5799 | inet6_rtm_delroute, NULL, 0); | |
5800 | if (ret < 0) | |
5801 | goto out_register_late_subsys; | |
5802 | ||
5803 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
5804 | inet6_rtm_getroute, NULL, | |
5805 | RTNL_FLAG_DOIT_UNLOCKED); | |
5806 | if (ret < 0) | |
d189634e | 5807 | goto out_register_late_subsys; |
c127ea2c | 5808 | |
8ed67789 | 5809 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 5810 | if (ret) |
d189634e | 5811 | goto out_register_late_subsys; |
8ed67789 | 5812 | |
8d0b94af MKL |
5813 | for_each_possible_cpu(cpu) { |
5814 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
5815 | ||
5816 | INIT_LIST_HEAD(&ul->head); | |
5817 | spin_lock_init(&ul->lock); | |
5818 | } | |
5819 | ||
433d49c3 DL |
5820 | out: |
5821 | return ret; | |
5822 | ||
d189634e | 5823 | out_register_late_subsys: |
16feebcf | 5824 | rtnl_unregister_all(PF_INET6); |
d189634e | 5825 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 5826 | fib6_rules_init: |
433d49c3 DL |
5827 | fib6_rules_cleanup(); |
5828 | xfrm6_init: | |
433d49c3 | 5829 | xfrm6_fini(); |
2a0c451a TG |
5830 | out_fib6_init: |
5831 | fib6_gc_cleanup(); | |
8ed67789 DL |
5832 | out_register_subsys: |
5833 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
5834 | out_register_inetpeer: |
5835 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
5836 | out_dst_entries: |
5837 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 5838 | out_kmem_cache: |
f2fc6a54 | 5839 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 5840 | goto out; |
1da177e4 LT |
5841 | } |
5842 | ||
5843 | void ip6_route_cleanup(void) | |
5844 | { | |
8ed67789 | 5845 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 5846 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 5847 | fib6_rules_cleanup(); |
1da177e4 | 5848 | xfrm6_fini(); |
1da177e4 | 5849 | fib6_gc_cleanup(); |
c3426b47 | 5850 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 5851 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 5852 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 5853 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 5854 | } |