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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 | 30 | #include <linux/errno.h> |
bc3b2d7f | 31 | #include <linux/export.h> |
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/times.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/in6.h> | |
7bc570c8 | 40 | #include <linux/mroute6.h> |
1da177e4 | 41 | #include <linux/init.h> |
1da177e4 | 42 | #include <linux/if_arp.h> |
1da177e4 LT |
43 | #include <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
5b7c931d | 45 | #include <linux/nsproxy.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
35732d01 | 47 | #include <linux/jhash.h> |
457c4cbc | 48 | #include <net/net_namespace.h> |
1da177e4 LT |
49 | #include <net/snmp.h> |
50 | #include <net/ipv6.h> | |
51 | #include <net/ip6_fib.h> | |
52 | #include <net/ip6_route.h> | |
53 | #include <net/ndisc.h> | |
54 | #include <net/addrconf.h> | |
55 | #include <net/tcp.h> | |
56 | #include <linux/rtnetlink.h> | |
57 | #include <net/dst.h> | |
904af04d | 58 | #include <net/dst_metadata.h> |
1da177e4 | 59 | #include <net/xfrm.h> |
8d71740c | 60 | #include <net/netevent.h> |
21713ebc | 61 | #include <net/netlink.h> |
51ebd318 | 62 | #include <net/nexthop.h> |
19e42e45 | 63 | #include <net/lwtunnel.h> |
904af04d | 64 | #include <net/ip_tunnels.h> |
ca254490 | 65 | #include <net/l3mdev.h> |
b811580d | 66 | #include <trace/events/fib6.h> |
1da177e4 | 67 | |
7c0f6ba6 | 68 | #include <linux/uaccess.h> |
1da177e4 LT |
69 | |
70 | #ifdef CONFIG_SYSCTL | |
71 | #include <linux/sysctl.h> | |
72 | #endif | |
73 | ||
afc154e9 | 74 | enum rt6_nud_state { |
7e980569 JB |
75 | RT6_NUD_FAIL_HARD = -3, |
76 | RT6_NUD_FAIL_PROBE = -2, | |
77 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
78 | RT6_NUD_SUCCEED = 1 |
79 | }; | |
80 | ||
83a09abd | 81 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 82 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 83 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 84 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
85 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
86 | static void ip6_dst_destroy(struct dst_entry *); | |
87 | static void ip6_dst_ifdown(struct dst_entry *, | |
88 | struct net_device *dev, int how); | |
569d3645 | 89 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
90 | |
91 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 92 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 93 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 94 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 95 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
96 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
97 | struct sk_buff *skb, u32 mtu); | |
98 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
99 | struct sk_buff *skb); | |
4b32b5ad | 100 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 101 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
16a16cd3 DA |
102 | static size_t rt6_nlmsg_size(struct rt6_info *rt); |
103 | static int rt6_fill_node(struct net *net, | |
104 | struct sk_buff *skb, struct rt6_info *rt, | |
105 | struct in6_addr *dst, struct in6_addr *src, | |
106 | int iif, int type, u32 portid, u32 seq, | |
107 | unsigned int flags); | |
35732d01 WW |
108 | static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt, |
109 | struct in6_addr *daddr, | |
110 | struct in6_addr *saddr); | |
1da177e4 | 111 | |
70ceb4f5 | 112 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 113 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 114 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
115 | const struct in6_addr *gwaddr, |
116 | struct net_device *dev, | |
95c96174 | 117 | unsigned int pref); |
efa2cea0 | 118 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 119 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
120 | const struct in6_addr *gwaddr, |
121 | struct net_device *dev); | |
70ceb4f5 YH |
122 | #endif |
123 | ||
8d0b94af MKL |
124 | struct uncached_list { |
125 | spinlock_t lock; | |
126 | struct list_head head; | |
127 | }; | |
128 | ||
129 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
130 | ||
131 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
132 | { | |
133 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
134 | ||
8d0b94af MKL |
135 | rt->rt6i_uncached_list = ul; |
136 | ||
137 | spin_lock_bh(&ul->lock); | |
138 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
139 | spin_unlock_bh(&ul->lock); | |
140 | } | |
141 | ||
142 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
143 | { | |
144 | if (!list_empty(&rt->rt6i_uncached)) { | |
145 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
81eb8447 | 146 | struct net *net = dev_net(rt->dst.dev); |
8d0b94af MKL |
147 | |
148 | spin_lock_bh(&ul->lock); | |
149 | list_del(&rt->rt6i_uncached); | |
81eb8447 | 150 | atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache); |
8d0b94af MKL |
151 | spin_unlock_bh(&ul->lock); |
152 | } | |
153 | } | |
154 | ||
155 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
156 | { | |
157 | struct net_device *loopback_dev = net->loopback_dev; | |
158 | int cpu; | |
159 | ||
e332bc67 EB |
160 | if (dev == loopback_dev) |
161 | return; | |
162 | ||
8d0b94af MKL |
163 | for_each_possible_cpu(cpu) { |
164 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
165 | struct rt6_info *rt; | |
166 | ||
167 | spin_lock_bh(&ul->lock); | |
168 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
169 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
170 | struct net_device *rt_dev = rt->dst.dev; | |
171 | ||
e332bc67 | 172 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
173 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
174 | in6_dev_put(rt_idev); | |
175 | } | |
176 | ||
e332bc67 | 177 | if (rt_dev == dev) { |
8d0b94af MKL |
178 | rt->dst.dev = loopback_dev; |
179 | dev_hold(rt->dst.dev); | |
180 | dev_put(rt_dev); | |
181 | } | |
182 | } | |
183 | spin_unlock_bh(&ul->lock); | |
184 | } | |
185 | } | |
186 | ||
d52d3997 MKL |
187 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
188 | { | |
189 | return dst_metrics_write_ptr(rt->dst.from); | |
190 | } | |
191 | ||
06582540 DM |
192 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
193 | { | |
4b32b5ad | 194 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 195 | |
d52d3997 MKL |
196 | if (rt->rt6i_flags & RTF_PCPU) |
197 | return rt6_pcpu_cow_metrics(rt); | |
198 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
199 | return NULL; |
200 | else | |
3b471175 | 201 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
202 | } |
203 | ||
f894cbf8 DM |
204 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
205 | struct sk_buff *skb, | |
206 | const void *daddr) | |
39232973 DM |
207 | { |
208 | struct in6_addr *p = &rt->rt6i_gateway; | |
209 | ||
a7563f34 | 210 | if (!ipv6_addr_any(p)) |
39232973 | 211 | return (const void *) p; |
f894cbf8 DM |
212 | else if (skb) |
213 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
214 | return daddr; |
215 | } | |
216 | ||
f894cbf8 DM |
217 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
218 | struct sk_buff *skb, | |
219 | const void *daddr) | |
d3aaeb38 | 220 | { |
39232973 DM |
221 | struct rt6_info *rt = (struct rt6_info *) dst; |
222 | struct neighbour *n; | |
223 | ||
f894cbf8 | 224 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 225 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
226 | if (n) |
227 | return n; | |
228 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
229 | } | |
230 | ||
63fca65d JA |
231 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
232 | { | |
233 | struct net_device *dev = dst->dev; | |
234 | struct rt6_info *rt = (struct rt6_info *)dst; | |
235 | ||
236 | daddr = choose_neigh_daddr(rt, NULL, daddr); | |
237 | if (!daddr) | |
238 | return; | |
239 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
240 | return; | |
241 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
242 | return; | |
243 | __ipv6_confirm_neigh(dev, daddr); | |
244 | } | |
245 | ||
9a7ec3a9 | 246 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 247 | .family = AF_INET6, |
1da177e4 LT |
248 | .gc = ip6_dst_gc, |
249 | .gc_thresh = 1024, | |
250 | .check = ip6_dst_check, | |
0dbaee3b | 251 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 252 | .mtu = ip6_mtu, |
06582540 | 253 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
254 | .destroy = ip6_dst_destroy, |
255 | .ifdown = ip6_dst_ifdown, | |
256 | .negative_advice = ip6_negative_advice, | |
257 | .link_failure = ip6_link_failure, | |
258 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 259 | .redirect = rt6_do_redirect, |
9f8955cc | 260 | .local_out = __ip6_local_out, |
d3aaeb38 | 261 | .neigh_lookup = ip6_neigh_lookup, |
63fca65d | 262 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
263 | }; |
264 | ||
ebb762f2 | 265 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 266 | { |
618f9bc7 SK |
267 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
268 | ||
269 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
270 | } |
271 | ||
6700c270 DM |
272 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
273 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
274 | { |
275 | } | |
276 | ||
6700c270 DM |
277 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
278 | struct sk_buff *skb) | |
b587ee3b DM |
279 | { |
280 | } | |
281 | ||
14e50e57 DM |
282 | static struct dst_ops ip6_dst_blackhole_ops = { |
283 | .family = AF_INET6, | |
14e50e57 DM |
284 | .destroy = ip6_dst_destroy, |
285 | .check = ip6_dst_check, | |
ebb762f2 | 286 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 287 | .default_advmss = ip6_default_advmss, |
14e50e57 | 288 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 289 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 290 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 291 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
292 | }; |
293 | ||
62fa8a84 | 294 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 295 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
296 | }; |
297 | ||
fb0af4c7 | 298 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
299 | .dst = { |
300 | .__refcnt = ATOMIC_INIT(1), | |
301 | .__use = 1, | |
2c20cbd7 | 302 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 303 | .error = -ENETUNREACH, |
d8d1f30b CG |
304 | .input = ip6_pkt_discard, |
305 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
306 | }, |
307 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 308 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
309 | .rt6i_metric = ~(u32) 0, |
310 | .rt6i_ref = ATOMIC_INIT(1), | |
311 | }; | |
312 | ||
101367c2 TG |
313 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
314 | ||
fb0af4c7 | 315 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
316 | .dst = { |
317 | .__refcnt = ATOMIC_INIT(1), | |
318 | .__use = 1, | |
2c20cbd7 | 319 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 320 | .error = -EACCES, |
d8d1f30b CG |
321 | .input = ip6_pkt_prohibit, |
322 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
323 | }, |
324 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 325 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
326 | .rt6i_metric = ~(u32) 0, |
327 | .rt6i_ref = ATOMIC_INIT(1), | |
328 | }; | |
329 | ||
fb0af4c7 | 330 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
331 | .dst = { |
332 | .__refcnt = ATOMIC_INIT(1), | |
333 | .__use = 1, | |
2c20cbd7 | 334 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 335 | .error = -EINVAL, |
d8d1f30b | 336 | .input = dst_discard, |
ede2059d | 337 | .output = dst_discard_out, |
101367c2 TG |
338 | }, |
339 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 340 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
341 | .rt6i_metric = ~(u32) 0, |
342 | .rt6i_ref = ATOMIC_INIT(1), | |
343 | }; | |
344 | ||
345 | #endif | |
346 | ||
ebfa45f0 MKL |
347 | static void rt6_info_init(struct rt6_info *rt) |
348 | { | |
349 | struct dst_entry *dst = &rt->dst; | |
350 | ||
351 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
352 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
353 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
354 | } | |
355 | ||
1da177e4 | 356 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
357 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
358 | struct net_device *dev, | |
ad706862 | 359 | int flags) |
1da177e4 | 360 | { |
97bab73f | 361 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
b2a9c0ed | 362 | 1, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 363 | |
81eb8447 | 364 | if (rt) { |
ebfa45f0 | 365 | rt6_info_init(rt); |
81eb8447 WW |
366 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
367 | } | |
8104891b | 368 | |
cf911662 | 369 | return rt; |
1da177e4 LT |
370 | } |
371 | ||
9ab179d8 DA |
372 | struct rt6_info *ip6_dst_alloc(struct net *net, |
373 | struct net_device *dev, | |
374 | int flags) | |
d52d3997 | 375 | { |
ad706862 | 376 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
377 | |
378 | if (rt) { | |
379 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
bfd8e5a4 | 380 | if (!rt->rt6i_pcpu) { |
587fea74 | 381 | dst_release_immediate(&rt->dst); |
d52d3997 MKL |
382 | return NULL; |
383 | } | |
384 | } | |
385 | ||
386 | return rt; | |
387 | } | |
9ab179d8 | 388 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 389 | |
1da177e4 LT |
390 | static void ip6_dst_destroy(struct dst_entry *dst) |
391 | { | |
392 | struct rt6_info *rt = (struct rt6_info *)dst; | |
35732d01 | 393 | struct rt6_exception_bucket *bucket; |
ecd98837 | 394 | struct dst_entry *from = dst->from; |
8d0b94af | 395 | struct inet6_dev *idev; |
1da177e4 | 396 | |
4b32b5ad | 397 | dst_destroy_metrics_generic(dst); |
87775312 | 398 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
399 | rt6_uncached_list_del(rt); |
400 | ||
401 | idev = rt->rt6i_idev; | |
38308473 | 402 | if (idev) { |
1da177e4 LT |
403 | rt->rt6i_idev = NULL; |
404 | in6_dev_put(idev); | |
1ab1457c | 405 | } |
35732d01 WW |
406 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1); |
407 | if (bucket) { | |
408 | rt->rt6i_exception_bucket = NULL; | |
409 | kfree(bucket); | |
410 | } | |
1716a961 | 411 | |
ecd98837 YH |
412 | dst->from = NULL; |
413 | dst_release(from); | |
b3419363 DM |
414 | } |
415 | ||
1da177e4 LT |
416 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
417 | int how) | |
418 | { | |
419 | struct rt6_info *rt = (struct rt6_info *)dst; | |
420 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 421 | struct net_device *loopback_dev = |
c346dca1 | 422 | dev_net(dev)->loopback_dev; |
1da177e4 | 423 | |
e5645f51 WW |
424 | if (idev && idev->dev != loopback_dev) { |
425 | struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); | |
426 | if (loopback_idev) { | |
427 | rt->rt6i_idev = loopback_idev; | |
428 | in6_dev_put(idev); | |
97cac082 | 429 | } |
1da177e4 LT |
430 | } |
431 | } | |
432 | ||
5973fb1e MKL |
433 | static bool __rt6_check_expired(const struct rt6_info *rt) |
434 | { | |
435 | if (rt->rt6i_flags & RTF_EXPIRES) | |
436 | return time_after(jiffies, rt->dst.expires); | |
437 | else | |
438 | return false; | |
439 | } | |
440 | ||
a50feda5 | 441 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 442 | { |
1716a961 G |
443 | if (rt->rt6i_flags & RTF_EXPIRES) { |
444 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 445 | return true; |
1716a961 | 446 | } else if (rt->dst.from) { |
1e2ea8ad XL |
447 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
448 | rt6_check_expired((struct rt6_info *)rt->dst.from); | |
1716a961 | 449 | } |
a50feda5 | 450 | return false; |
1da177e4 LT |
451 | } |
452 | ||
51ebd318 | 453 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, |
52bd4c0c ND |
454 | struct flowi6 *fl6, int oif, |
455 | int strict) | |
51ebd318 ND |
456 | { |
457 | struct rt6_info *sibling, *next_sibling; | |
458 | int route_choosen; | |
459 | ||
b673d6cc JS |
460 | /* We might have already computed the hash for ICMPv6 errors. In such |
461 | * case it will always be non-zero. Otherwise now is the time to do it. | |
462 | */ | |
463 | if (!fl6->mp_hash) | |
464 | fl6->mp_hash = rt6_multipath_hash(fl6, NULL); | |
465 | ||
466 | route_choosen = fl6->mp_hash % (match->rt6i_nsiblings + 1); | |
51ebd318 ND |
467 | /* Don't change the route, if route_choosen == 0 |
468 | * (siblings does not include ourself) | |
469 | */ | |
470 | if (route_choosen) | |
471 | list_for_each_entry_safe(sibling, next_sibling, | |
472 | &match->rt6i_siblings, rt6i_siblings) { | |
473 | route_choosen--; | |
474 | if (route_choosen == 0) { | |
bbfcd776 IS |
475 | struct inet6_dev *idev = sibling->rt6i_idev; |
476 | ||
477 | if (!netif_carrier_ok(sibling->dst.dev) && | |
478 | idev->cnf.ignore_routes_with_linkdown) | |
479 | break; | |
52bd4c0c ND |
480 | if (rt6_score_route(sibling, oif, strict) < 0) |
481 | break; | |
51ebd318 ND |
482 | match = sibling; |
483 | break; | |
484 | } | |
485 | } | |
486 | return match; | |
487 | } | |
488 | ||
1da177e4 | 489 | /* |
66f5d6ce | 490 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
491 | */ |
492 | ||
8ed67789 DL |
493 | static inline struct rt6_info *rt6_device_match(struct net *net, |
494 | struct rt6_info *rt, | |
b71d1d42 | 495 | const struct in6_addr *saddr, |
1da177e4 | 496 | int oif, |
d420895e | 497 | int flags) |
1da177e4 LT |
498 | { |
499 | struct rt6_info *local = NULL; | |
500 | struct rt6_info *sprt; | |
501 | ||
dd3abc4e YH |
502 | if (!oif && ipv6_addr_any(saddr)) |
503 | goto out; | |
504 | ||
66f5d6ce | 505 | for (sprt = rt; sprt; sprt = rcu_dereference(sprt->dst.rt6_next)) { |
d1918542 | 506 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
507 | |
508 | if (oif) { | |
1da177e4 LT |
509 | if (dev->ifindex == oif) |
510 | return sprt; | |
511 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 512 | if (!sprt->rt6i_idev || |
1da177e4 | 513 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 514 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 515 | continue; |
17fb0b2b DA |
516 | if (local && |
517 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
518 | continue; |
519 | } | |
520 | local = sprt; | |
521 | } | |
dd3abc4e YH |
522 | } else { |
523 | if (ipv6_chk_addr(net, saddr, dev, | |
524 | flags & RT6_LOOKUP_F_IFACE)) | |
525 | return sprt; | |
1da177e4 | 526 | } |
dd3abc4e | 527 | } |
1da177e4 | 528 | |
dd3abc4e | 529 | if (oif) { |
1da177e4 LT |
530 | if (local) |
531 | return local; | |
532 | ||
d420895e | 533 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 534 | return net->ipv6.ip6_null_entry; |
1da177e4 | 535 | } |
dd3abc4e | 536 | out: |
1da177e4 LT |
537 | return rt; |
538 | } | |
539 | ||
27097255 | 540 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
541 | struct __rt6_probe_work { |
542 | struct work_struct work; | |
543 | struct in6_addr target; | |
544 | struct net_device *dev; | |
545 | }; | |
546 | ||
547 | static void rt6_probe_deferred(struct work_struct *w) | |
548 | { | |
549 | struct in6_addr mcaddr; | |
550 | struct __rt6_probe_work *work = | |
551 | container_of(w, struct __rt6_probe_work, work); | |
552 | ||
553 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 554 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 555 | dev_put(work->dev); |
662f5533 | 556 | kfree(work); |
c2f17e82 HFS |
557 | } |
558 | ||
27097255 YH |
559 | static void rt6_probe(struct rt6_info *rt) |
560 | { | |
990edb42 | 561 | struct __rt6_probe_work *work; |
f2c31e32 | 562 | struct neighbour *neigh; |
27097255 YH |
563 | /* |
564 | * Okay, this does not seem to be appropriate | |
565 | * for now, however, we need to check if it | |
566 | * is really so; aka Router Reachability Probing. | |
567 | * | |
568 | * Router Reachability Probe MUST be rate-limited | |
569 | * to no more than one per minute. | |
570 | */ | |
2152caea | 571 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 572 | return; |
2152caea YH |
573 | rcu_read_lock_bh(); |
574 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
575 | if (neigh) { | |
8d6c31bf MKL |
576 | if (neigh->nud_state & NUD_VALID) |
577 | goto out; | |
578 | ||
990edb42 | 579 | work = NULL; |
2152caea | 580 | write_lock(&neigh->lock); |
990edb42 MKL |
581 | if (!(neigh->nud_state & NUD_VALID) && |
582 | time_after(jiffies, | |
583 | neigh->updated + | |
584 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
585 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
586 | if (work) | |
587 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 588 | } |
2152caea | 589 | write_unlock(&neigh->lock); |
990edb42 MKL |
590 | } else { |
591 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 592 | } |
990edb42 MKL |
593 | |
594 | if (work) { | |
595 | INIT_WORK(&work->work, rt6_probe_deferred); | |
596 | work->target = rt->rt6i_gateway; | |
597 | dev_hold(rt->dst.dev); | |
598 | work->dev = rt->dst.dev; | |
599 | schedule_work(&work->work); | |
600 | } | |
601 | ||
8d6c31bf | 602 | out: |
2152caea | 603 | rcu_read_unlock_bh(); |
27097255 YH |
604 | } |
605 | #else | |
606 | static inline void rt6_probe(struct rt6_info *rt) | |
607 | { | |
27097255 YH |
608 | } |
609 | #endif | |
610 | ||
1da177e4 | 611 | /* |
554cfb7e | 612 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 613 | */ |
b6f99a21 | 614 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 615 | { |
d1918542 | 616 | struct net_device *dev = rt->dst.dev; |
161980f4 | 617 | if (!oif || dev->ifindex == oif) |
554cfb7e | 618 | return 2; |
161980f4 DM |
619 | if ((dev->flags & IFF_LOOPBACK) && |
620 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
621 | return 1; | |
622 | return 0; | |
554cfb7e | 623 | } |
1da177e4 | 624 | |
afc154e9 | 625 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 626 | { |
f2c31e32 | 627 | struct neighbour *neigh; |
afc154e9 | 628 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 629 | |
4d0c5911 YH |
630 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
631 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 632 | return RT6_NUD_SUCCEED; |
145a3621 YH |
633 | |
634 | rcu_read_lock_bh(); | |
635 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
636 | if (neigh) { | |
637 | read_lock(&neigh->lock); | |
554cfb7e | 638 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 639 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 640 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 641 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 642 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
643 | else |
644 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 645 | #endif |
145a3621 | 646 | read_unlock(&neigh->lock); |
afc154e9 HFS |
647 | } else { |
648 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 649 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 650 | } |
145a3621 YH |
651 | rcu_read_unlock_bh(); |
652 | ||
a5a81f0b | 653 | return ret; |
1da177e4 LT |
654 | } |
655 | ||
554cfb7e YH |
656 | static int rt6_score_route(struct rt6_info *rt, int oif, |
657 | int strict) | |
1da177e4 | 658 | { |
a5a81f0b | 659 | int m; |
1ab1457c | 660 | |
4d0c5911 | 661 | m = rt6_check_dev(rt, oif); |
77d16f45 | 662 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 663 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
664 | #ifdef CONFIG_IPV6_ROUTER_PREF |
665 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
666 | #endif | |
afc154e9 HFS |
667 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
668 | int n = rt6_check_neigh(rt); | |
669 | if (n < 0) | |
670 | return n; | |
671 | } | |
554cfb7e YH |
672 | return m; |
673 | } | |
674 | ||
f11e6659 | 675 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
676 | int *mpri, struct rt6_info *match, |
677 | bool *do_rr) | |
554cfb7e | 678 | { |
f11e6659 | 679 | int m; |
afc154e9 | 680 | bool match_do_rr = false; |
35103d11 AG |
681 | struct inet6_dev *idev = rt->rt6i_idev; |
682 | struct net_device *dev = rt->dst.dev; | |
683 | ||
684 | if (dev && !netif_carrier_ok(dev) && | |
d5d32e4b DA |
685 | idev->cnf.ignore_routes_with_linkdown && |
686 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) | |
35103d11 | 687 | goto out; |
f11e6659 DM |
688 | |
689 | if (rt6_check_expired(rt)) | |
690 | goto out; | |
691 | ||
692 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 693 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
694 | match_do_rr = true; |
695 | m = 0; /* lowest valid score */ | |
7e980569 | 696 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 697 | goto out; |
afc154e9 HFS |
698 | } |
699 | ||
700 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
701 | rt6_probe(rt); | |
f11e6659 | 702 | |
7e980569 | 703 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 704 | if (m > *mpri) { |
afc154e9 | 705 | *do_rr = match_do_rr; |
f11e6659 DM |
706 | *mpri = m; |
707 | match = rt; | |
f11e6659 | 708 | } |
f11e6659 DM |
709 | out: |
710 | return match; | |
711 | } | |
712 | ||
713 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
8d1040e8 | 714 | struct rt6_info *leaf, |
f11e6659 | 715 | struct rt6_info *rr_head, |
afc154e9 HFS |
716 | u32 metric, int oif, int strict, |
717 | bool *do_rr) | |
f11e6659 | 718 | { |
9fbdcfaf | 719 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 720 | int mpri = -1; |
1da177e4 | 721 | |
f11e6659 | 722 | match = NULL; |
9fbdcfaf | 723 | cont = NULL; |
66f5d6ce | 724 | for (rt = rr_head; rt; rt = rcu_dereference(rt->dst.rt6_next)) { |
9fbdcfaf SK |
725 | if (rt->rt6i_metric != metric) { |
726 | cont = rt; | |
727 | break; | |
728 | } | |
729 | ||
730 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
731 | } | |
732 | ||
66f5d6ce WW |
733 | for (rt = leaf; rt && rt != rr_head; |
734 | rt = rcu_dereference(rt->dst.rt6_next)) { | |
9fbdcfaf SK |
735 | if (rt->rt6i_metric != metric) { |
736 | cont = rt; | |
737 | break; | |
738 | } | |
739 | ||
afc154e9 | 740 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
741 | } |
742 | ||
743 | if (match || !cont) | |
744 | return match; | |
745 | ||
66f5d6ce | 746 | for (rt = cont; rt; rt = rcu_dereference(rt->dst.rt6_next)) |
afc154e9 | 747 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 748 | |
f11e6659 DM |
749 | return match; |
750 | } | |
1da177e4 | 751 | |
8d1040e8 WW |
752 | static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn, |
753 | int oif, int strict) | |
f11e6659 | 754 | { |
66f5d6ce | 755 | struct rt6_info *leaf = rcu_dereference(fn->leaf); |
f11e6659 | 756 | struct rt6_info *match, *rt0; |
afc154e9 | 757 | bool do_rr = false; |
17ecf590 | 758 | int key_plen; |
1da177e4 | 759 | |
87b1af8d | 760 | if (!leaf || leaf == net->ipv6.ip6_null_entry) |
8d1040e8 WW |
761 | return net->ipv6.ip6_null_entry; |
762 | ||
66f5d6ce | 763 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 764 | if (!rt0) |
66f5d6ce | 765 | rt0 = leaf; |
1da177e4 | 766 | |
17ecf590 WW |
767 | /* Double check to make sure fn is not an intermediate node |
768 | * and fn->leaf does not points to its child's leaf | |
769 | * (This might happen if all routes under fn are deleted from | |
770 | * the tree and fib6_repair_tree() is called on the node.) | |
771 | */ | |
772 | key_plen = rt0->rt6i_dst.plen; | |
773 | #ifdef CONFIG_IPV6_SUBTREES | |
774 | if (rt0->rt6i_src.plen) | |
775 | key_plen = rt0->rt6i_src.plen; | |
776 | #endif | |
777 | if (fn->fn_bit != key_plen) | |
778 | return net->ipv6.ip6_null_entry; | |
779 | ||
8d1040e8 | 780 | match = find_rr_leaf(fn, leaf, rt0, rt0->rt6i_metric, oif, strict, |
afc154e9 | 781 | &do_rr); |
1da177e4 | 782 | |
afc154e9 | 783 | if (do_rr) { |
66f5d6ce | 784 | struct rt6_info *next = rcu_dereference(rt0->dst.rt6_next); |
f11e6659 | 785 | |
554cfb7e | 786 | /* no entries matched; do round-robin */ |
f11e6659 | 787 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
8d1040e8 | 788 | next = leaf; |
f11e6659 | 789 | |
66f5d6ce WW |
790 | if (next != rt0) { |
791 | spin_lock_bh(&leaf->rt6i_table->tb6_lock); | |
792 | /* make sure next is not being deleted from the tree */ | |
793 | if (next->rt6i_node) | |
794 | rcu_assign_pointer(fn->rr_ptr, next); | |
795 | spin_unlock_bh(&leaf->rt6i_table->tb6_lock); | |
796 | } | |
1da177e4 | 797 | } |
1da177e4 | 798 | |
a02cec21 | 799 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
800 | } |
801 | ||
8b9df265 MKL |
802 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
803 | { | |
804 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
805 | } | |
806 | ||
70ceb4f5 YH |
807 | #ifdef CONFIG_IPV6_ROUTE_INFO |
808 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 809 | const struct in6_addr *gwaddr) |
70ceb4f5 | 810 | { |
c346dca1 | 811 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
812 | struct route_info *rinfo = (struct route_info *) opt; |
813 | struct in6_addr prefix_buf, *prefix; | |
814 | unsigned int pref; | |
4bed72e4 | 815 | unsigned long lifetime; |
70ceb4f5 YH |
816 | struct rt6_info *rt; |
817 | ||
818 | if (len < sizeof(struct route_info)) { | |
819 | return -EINVAL; | |
820 | } | |
821 | ||
822 | /* Sanity check for prefix_len and length */ | |
823 | if (rinfo->length > 3) { | |
824 | return -EINVAL; | |
825 | } else if (rinfo->prefix_len > 128) { | |
826 | return -EINVAL; | |
827 | } else if (rinfo->prefix_len > 64) { | |
828 | if (rinfo->length < 2) { | |
829 | return -EINVAL; | |
830 | } | |
831 | } else if (rinfo->prefix_len > 0) { | |
832 | if (rinfo->length < 1) { | |
833 | return -EINVAL; | |
834 | } | |
835 | } | |
836 | ||
837 | pref = rinfo->route_pref; | |
838 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 839 | return -EINVAL; |
70ceb4f5 | 840 | |
4bed72e4 | 841 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
842 | |
843 | if (rinfo->length == 3) | |
844 | prefix = (struct in6_addr *)rinfo->prefix; | |
845 | else { | |
846 | /* this function is safe */ | |
847 | ipv6_addr_prefix(&prefix_buf, | |
848 | (struct in6_addr *)rinfo->prefix, | |
849 | rinfo->prefix_len); | |
850 | prefix = &prefix_buf; | |
851 | } | |
852 | ||
f104a567 DJ |
853 | if (rinfo->prefix_len == 0) |
854 | rt = rt6_get_dflt_router(gwaddr, dev); | |
855 | else | |
856 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 857 | gwaddr, dev); |
70ceb4f5 YH |
858 | |
859 | if (rt && !lifetime) { | |
e0a1ad73 | 860 | ip6_del_rt(rt); |
70ceb4f5 YH |
861 | rt = NULL; |
862 | } | |
863 | ||
864 | if (!rt && lifetime) | |
830218c1 DA |
865 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
866 | dev, pref); | |
70ceb4f5 YH |
867 | else if (rt) |
868 | rt->rt6i_flags = RTF_ROUTEINFO | | |
869 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
870 | ||
871 | if (rt) { | |
1716a961 G |
872 | if (!addrconf_finite_timeout(lifetime)) |
873 | rt6_clean_expires(rt); | |
874 | else | |
875 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
876 | ||
94e187c0 | 877 | ip6_rt_put(rt); |
70ceb4f5 YH |
878 | } |
879 | return 0; | |
880 | } | |
881 | #endif | |
882 | ||
a3c00e46 MKL |
883 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
884 | struct in6_addr *saddr) | |
885 | { | |
66f5d6ce | 886 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
887 | while (1) { |
888 | if (fn->fn_flags & RTN_TL_ROOT) | |
889 | return NULL; | |
66f5d6ce WW |
890 | pn = rcu_dereference(fn->parent); |
891 | sn = FIB6_SUBTREE(pn); | |
892 | if (sn && sn != fn) | |
893 | fn = fib6_lookup(sn, NULL, saddr); | |
a3c00e46 MKL |
894 | else |
895 | fn = pn; | |
896 | if (fn->fn_flags & RTN_RTINFO) | |
897 | return fn; | |
898 | } | |
899 | } | |
c71099ac | 900 | |
d3843fe5 WW |
901 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt, |
902 | bool null_fallback) | |
903 | { | |
904 | struct rt6_info *rt = *prt; | |
905 | ||
906 | if (dst_hold_safe(&rt->dst)) | |
907 | return true; | |
908 | if (null_fallback) { | |
909 | rt = net->ipv6.ip6_null_entry; | |
910 | dst_hold(&rt->dst); | |
911 | } else { | |
912 | rt = NULL; | |
913 | } | |
914 | *prt = rt; | |
915 | return false; | |
916 | } | |
917 | ||
8ed67789 DL |
918 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
919 | struct fib6_table *table, | |
4c9483b2 | 920 | struct flowi6 *fl6, int flags) |
1da177e4 | 921 | { |
2b760fcf | 922 | struct rt6_info *rt, *rt_cache; |
1da177e4 | 923 | struct fib6_node *fn; |
1da177e4 | 924 | |
66f5d6ce | 925 | rcu_read_lock(); |
4c9483b2 | 926 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 927 | restart: |
66f5d6ce WW |
928 | rt = rcu_dereference(fn->leaf); |
929 | if (!rt) { | |
930 | rt = net->ipv6.ip6_null_entry; | |
931 | } else { | |
932 | rt = rt6_device_match(net, rt, &fl6->saddr, | |
933 | fl6->flowi6_oif, flags); | |
934 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) | |
935 | rt = rt6_multipath_select(rt, fl6, | |
936 | fl6->flowi6_oif, flags); | |
937 | } | |
a3c00e46 MKL |
938 | if (rt == net->ipv6.ip6_null_entry) { |
939 | fn = fib6_backtrack(fn, &fl6->saddr); | |
940 | if (fn) | |
941 | goto restart; | |
942 | } | |
2b760fcf WW |
943 | /* Search through exception table */ |
944 | rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr); | |
945 | if (rt_cache) | |
946 | rt = rt_cache; | |
947 | ||
d3843fe5 WW |
948 | if (ip6_hold_safe(net, &rt, true)) |
949 | dst_use_noref(&rt->dst, jiffies); | |
950 | ||
66f5d6ce | 951 | rcu_read_unlock(); |
b811580d | 952 | |
b65f164d | 953 | trace_fib6_table_lookup(net, rt, table, fl6); |
b811580d | 954 | |
c71099ac TG |
955 | return rt; |
956 | ||
957 | } | |
958 | ||
67ba4152 | 959 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
960 | int flags) |
961 | { | |
962 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
963 | } | |
964 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
965 | ||
9acd9f3a YH |
966 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
967 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 968 | { |
4c9483b2 DM |
969 | struct flowi6 fl6 = { |
970 | .flowi6_oif = oif, | |
971 | .daddr = *daddr, | |
c71099ac TG |
972 | }; |
973 | struct dst_entry *dst; | |
77d16f45 | 974 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 975 | |
adaa70bb | 976 | if (saddr) { |
4c9483b2 | 977 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
978 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
979 | } | |
980 | ||
4c9483b2 | 981 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
982 | if (dst->error == 0) |
983 | return (struct rt6_info *) dst; | |
984 | ||
985 | dst_release(dst); | |
986 | ||
1da177e4 LT |
987 | return NULL; |
988 | } | |
7159039a YH |
989 | EXPORT_SYMBOL(rt6_lookup); |
990 | ||
c71099ac | 991 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
992 | * It takes new route entry, the addition fails by any reason the |
993 | * route is released. | |
994 | * Caller must hold dst before calling it. | |
1da177e4 LT |
995 | */ |
996 | ||
e5fd387a | 997 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
333c4301 DA |
998 | struct mx6_config *mxc, |
999 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1000 | { |
1001 | int err; | |
c71099ac | 1002 | struct fib6_table *table; |
1da177e4 | 1003 | |
c71099ac | 1004 | table = rt->rt6i_table; |
66f5d6ce | 1005 | spin_lock_bh(&table->tb6_lock); |
333c4301 | 1006 | err = fib6_add(&table->tb6_root, rt, info, mxc, extack); |
66f5d6ce | 1007 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1008 | |
1009 | return err; | |
1010 | } | |
1011 | ||
40e22e8f TG |
1012 | int ip6_ins_rt(struct rt6_info *rt) |
1013 | { | |
e715b6d3 FW |
1014 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
1015 | struct mx6_config mxc = { .mx = NULL, }; | |
1016 | ||
1cfb71ee WW |
1017 | /* Hold dst to account for the reference from the fib6 tree */ |
1018 | dst_hold(&rt->dst); | |
333c4301 | 1019 | return __ip6_ins_rt(rt, &info, &mxc, NULL); |
40e22e8f TG |
1020 | } |
1021 | ||
4832c30d DA |
1022 | /* called with rcu_lock held */ |
1023 | static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt) | |
1024 | { | |
1025 | struct net_device *dev = rt->dst.dev; | |
1026 | ||
98d11291 | 1027 | if (rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
4832c30d DA |
1028 | /* for copies of local routes, dst->dev needs to be the |
1029 | * device if it is a master device, the master device if | |
1030 | * device is enslaved, and the loopback as the default | |
1031 | */ | |
1032 | if (netif_is_l3_slave(dev) && | |
1033 | !rt6_need_strict(&rt->rt6i_dst.addr)) | |
1034 | dev = l3mdev_master_dev_rcu(dev); | |
1035 | else if (!netif_is_l3_master(dev)) | |
1036 | dev = dev_net(dev)->loopback_dev; | |
1037 | /* last case is netif_is_l3_master(dev) is true in which | |
1038 | * case we want dev returned to be dev | |
1039 | */ | |
1040 | } | |
1041 | ||
1042 | return dev; | |
1043 | } | |
1044 | ||
8b9df265 MKL |
1045 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
1046 | const struct in6_addr *daddr, | |
1047 | const struct in6_addr *saddr) | |
1da177e4 | 1048 | { |
4832c30d | 1049 | struct net_device *dev; |
1da177e4 LT |
1050 | struct rt6_info *rt; |
1051 | ||
1052 | /* | |
1053 | * Clone the route. | |
1054 | */ | |
1055 | ||
d52d3997 | 1056 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 1057 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 1058 | |
4832c30d DA |
1059 | rcu_read_lock(); |
1060 | dev = ip6_rt_get_dev_rcu(ort); | |
1061 | rt = __ip6_dst_alloc(dev_net(dev), dev, 0); | |
1062 | rcu_read_unlock(); | |
83a09abd MKL |
1063 | if (!rt) |
1064 | return NULL; | |
1065 | ||
1066 | ip6_rt_copy_init(rt, ort); | |
1067 | rt->rt6i_flags |= RTF_CACHE; | |
1068 | rt->rt6i_metric = 0; | |
1069 | rt->dst.flags |= DST_HOST; | |
1070 | rt->rt6i_dst.addr = *daddr; | |
1071 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1072 | |
83a09abd MKL |
1073 | if (!rt6_is_gw_or_nonexthop(ort)) { |
1074 | if (ort->rt6i_dst.plen != 128 && | |
1075 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
1076 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 1077 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1078 | if (rt->rt6i_src.plen && saddr) { |
1079 | rt->rt6i_src.addr = *saddr; | |
1080 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1081 | } |
83a09abd | 1082 | #endif |
95a9a5ba | 1083 | } |
1da177e4 | 1084 | |
95a9a5ba YH |
1085 | return rt; |
1086 | } | |
1da177e4 | 1087 | |
d52d3997 MKL |
1088 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
1089 | { | |
4832c30d | 1090 | struct net_device *dev; |
d52d3997 MKL |
1091 | struct rt6_info *pcpu_rt; |
1092 | ||
4832c30d DA |
1093 | rcu_read_lock(); |
1094 | dev = ip6_rt_get_dev_rcu(rt); | |
1095 | pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, rt->dst.flags); | |
1096 | rcu_read_unlock(); | |
d52d3997 MKL |
1097 | if (!pcpu_rt) |
1098 | return NULL; | |
1099 | ip6_rt_copy_init(pcpu_rt, rt); | |
1100 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
1101 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
1102 | return pcpu_rt; | |
1103 | } | |
1104 | ||
66f5d6ce | 1105 | /* It should be called with rcu_read_lock() acquired */ |
d52d3997 MKL |
1106 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) |
1107 | { | |
a73e4195 | 1108 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
1109 | |
1110 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1111 | pcpu_rt = *p; | |
1112 | ||
d3843fe5 | 1113 | if (pcpu_rt && ip6_hold_safe(NULL, &pcpu_rt, false)) |
a73e4195 | 1114 | rt6_dst_from_metrics_check(pcpu_rt); |
d3843fe5 | 1115 | |
a73e4195 MKL |
1116 | return pcpu_rt; |
1117 | } | |
1118 | ||
1119 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1120 | { | |
1121 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 MKL |
1122 | |
1123 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1124 | if (!pcpu_rt) { | |
1125 | struct net *net = dev_net(rt->dst.dev); | |
1126 | ||
9c7370a1 MKL |
1127 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1128 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1129 | } |
1130 | ||
a94b9367 WW |
1131 | dst_hold(&pcpu_rt->dst); |
1132 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1133 | prev = cmpxchg(p, NULL, pcpu_rt); | |
951f788a | 1134 | BUG_ON(prev); |
a94b9367 | 1135 | |
d52d3997 MKL |
1136 | rt6_dst_from_metrics_check(pcpu_rt); |
1137 | return pcpu_rt; | |
1138 | } | |
1139 | ||
35732d01 WW |
1140 | /* exception hash table implementation |
1141 | */ | |
1142 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1143 | ||
1144 | /* Remove rt6_ex from hash table and free the memory | |
1145 | * Caller must hold rt6_exception_lock | |
1146 | */ | |
1147 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1148 | struct rt6_exception *rt6_ex) | |
1149 | { | |
b2427e67 | 1150 | struct net *net; |
81eb8447 | 1151 | |
35732d01 WW |
1152 | if (!bucket || !rt6_ex) |
1153 | return; | |
b2427e67 CIK |
1154 | |
1155 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
35732d01 WW |
1156 | rt6_ex->rt6i->rt6i_node = NULL; |
1157 | hlist_del_rcu(&rt6_ex->hlist); | |
1158 | rt6_release(rt6_ex->rt6i); | |
1159 | kfree_rcu(rt6_ex, rcu); | |
1160 | WARN_ON_ONCE(!bucket->depth); | |
1161 | bucket->depth--; | |
81eb8447 | 1162 | net->ipv6.rt6_stats->fib_rt_cache--; |
35732d01 WW |
1163 | } |
1164 | ||
1165 | /* Remove oldest rt6_ex in bucket and free the memory | |
1166 | * Caller must hold rt6_exception_lock | |
1167 | */ | |
1168 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1169 | { | |
1170 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1171 | ||
1172 | if (!bucket) | |
1173 | return; | |
1174 | ||
1175 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1176 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1177 | oldest = rt6_ex; | |
1178 | } | |
1179 | rt6_remove_exception(bucket, oldest); | |
1180 | } | |
1181 | ||
1182 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1183 | const struct in6_addr *src) | |
1184 | { | |
1185 | static u32 seed __read_mostly; | |
1186 | u32 val; | |
1187 | ||
1188 | net_get_random_once(&seed, sizeof(seed)); | |
1189 | val = jhash(dst, sizeof(*dst), seed); | |
1190 | ||
1191 | #ifdef CONFIG_IPV6_SUBTREES | |
1192 | if (src) | |
1193 | val = jhash(src, sizeof(*src), val); | |
1194 | #endif | |
1195 | return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
1196 | } | |
1197 | ||
1198 | /* Helper function to find the cached rt in the hash table | |
1199 | * and update bucket pointer to point to the bucket for this | |
1200 | * (daddr, saddr) pair | |
1201 | * Caller must hold rt6_exception_lock | |
1202 | */ | |
1203 | static struct rt6_exception * | |
1204 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1205 | const struct in6_addr *daddr, | |
1206 | const struct in6_addr *saddr) | |
1207 | { | |
1208 | struct rt6_exception *rt6_ex; | |
1209 | u32 hval; | |
1210 | ||
1211 | if (!(*bucket) || !daddr) | |
1212 | return NULL; | |
1213 | ||
1214 | hval = rt6_exception_hash(daddr, saddr); | |
1215 | *bucket += hval; | |
1216 | ||
1217 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1218 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1219 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1220 | ||
1221 | #ifdef CONFIG_IPV6_SUBTREES | |
1222 | if (matched && saddr) | |
1223 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1224 | #endif | |
1225 | if (matched) | |
1226 | return rt6_ex; | |
1227 | } | |
1228 | return NULL; | |
1229 | } | |
1230 | ||
1231 | /* Helper function to find the cached rt in the hash table | |
1232 | * and update bucket pointer to point to the bucket for this | |
1233 | * (daddr, saddr) pair | |
1234 | * Caller must hold rcu_read_lock() | |
1235 | */ | |
1236 | static struct rt6_exception * | |
1237 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1238 | const struct in6_addr *daddr, | |
1239 | const struct in6_addr *saddr) | |
1240 | { | |
1241 | struct rt6_exception *rt6_ex; | |
1242 | u32 hval; | |
1243 | ||
1244 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1245 | ||
1246 | if (!(*bucket) || !daddr) | |
1247 | return NULL; | |
1248 | ||
1249 | hval = rt6_exception_hash(daddr, saddr); | |
1250 | *bucket += hval; | |
1251 | ||
1252 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1253 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1254 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1255 | ||
1256 | #ifdef CONFIG_IPV6_SUBTREES | |
1257 | if (matched && saddr) | |
1258 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1259 | #endif | |
1260 | if (matched) | |
1261 | return rt6_ex; | |
1262 | } | |
1263 | return NULL; | |
1264 | } | |
1265 | ||
1266 | static int rt6_insert_exception(struct rt6_info *nrt, | |
1267 | struct rt6_info *ort) | |
1268 | { | |
81eb8447 | 1269 | struct net *net = dev_net(ort->dst.dev); |
35732d01 WW |
1270 | struct rt6_exception_bucket *bucket; |
1271 | struct in6_addr *src_key = NULL; | |
1272 | struct rt6_exception *rt6_ex; | |
1273 | int err = 0; | |
1274 | ||
1275 | /* ort can't be a cache or pcpu route */ | |
1276 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) | |
1277 | ort = (struct rt6_info *)ort->dst.from; | |
1278 | WARN_ON_ONCE(ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)); | |
1279 | ||
1280 | spin_lock_bh(&rt6_exception_lock); | |
1281 | ||
1282 | if (ort->exception_bucket_flushed) { | |
1283 | err = -EINVAL; | |
1284 | goto out; | |
1285 | } | |
1286 | ||
1287 | bucket = rcu_dereference_protected(ort->rt6i_exception_bucket, | |
1288 | lockdep_is_held(&rt6_exception_lock)); | |
1289 | if (!bucket) { | |
1290 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1291 | GFP_ATOMIC); | |
1292 | if (!bucket) { | |
1293 | err = -ENOMEM; | |
1294 | goto out; | |
1295 | } | |
1296 | rcu_assign_pointer(ort->rt6i_exception_bucket, bucket); | |
1297 | } | |
1298 | ||
1299 | #ifdef CONFIG_IPV6_SUBTREES | |
1300 | /* rt6i_src.plen != 0 indicates ort is in subtree | |
1301 | * and exception table is indexed by a hash of | |
1302 | * both rt6i_dst and rt6i_src. | |
1303 | * Otherwise, the exception table is indexed by | |
1304 | * a hash of only rt6i_dst. | |
1305 | */ | |
1306 | if (ort->rt6i_src.plen) | |
1307 | src_key = &nrt->rt6i_src.addr; | |
1308 | #endif | |
60006a48 WW |
1309 | |
1310 | /* Update rt6i_prefsrc as it could be changed | |
1311 | * in rt6_remove_prefsrc() | |
1312 | */ | |
1313 | nrt->rt6i_prefsrc = ort->rt6i_prefsrc; | |
f5bbe7ee WW |
1314 | /* rt6_mtu_change() might lower mtu on ort. |
1315 | * Only insert this exception route if its mtu | |
1316 | * is less than ort's mtu value. | |
1317 | */ | |
1318 | if (nrt->rt6i_pmtu >= dst_mtu(&ort->dst)) { | |
1319 | err = -EINVAL; | |
1320 | goto out; | |
1321 | } | |
60006a48 | 1322 | |
35732d01 WW |
1323 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1324 | src_key); | |
1325 | if (rt6_ex) | |
1326 | rt6_remove_exception(bucket, rt6_ex); | |
1327 | ||
1328 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1329 | if (!rt6_ex) { | |
1330 | err = -ENOMEM; | |
1331 | goto out; | |
1332 | } | |
1333 | rt6_ex->rt6i = nrt; | |
1334 | rt6_ex->stamp = jiffies; | |
1335 | atomic_inc(&nrt->rt6i_ref); | |
1336 | nrt->rt6i_node = ort->rt6i_node; | |
1337 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); | |
1338 | bucket->depth++; | |
81eb8447 | 1339 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 WW |
1340 | |
1341 | if (bucket->depth > FIB6_MAX_DEPTH) | |
1342 | rt6_exception_remove_oldest(bucket); | |
1343 | ||
1344 | out: | |
1345 | spin_unlock_bh(&rt6_exception_lock); | |
1346 | ||
1347 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1348 | if (!err) { |
35732d01 | 1349 | fib6_update_sernum(ort); |
b886d5f2 PA |
1350 | fib6_force_start_gc(net); |
1351 | } | |
35732d01 WW |
1352 | |
1353 | return err; | |
1354 | } | |
1355 | ||
1356 | void rt6_flush_exceptions(struct rt6_info *rt) | |
1357 | { | |
1358 | struct rt6_exception_bucket *bucket; | |
1359 | struct rt6_exception *rt6_ex; | |
1360 | struct hlist_node *tmp; | |
1361 | int i; | |
1362 | ||
1363 | spin_lock_bh(&rt6_exception_lock); | |
1364 | /* Prevent rt6_insert_exception() to recreate the bucket list */ | |
1365 | rt->exception_bucket_flushed = 1; | |
1366 | ||
1367 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1368 | lockdep_is_held(&rt6_exception_lock)); | |
1369 | if (!bucket) | |
1370 | goto out; | |
1371 | ||
1372 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1373 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) | |
1374 | rt6_remove_exception(bucket, rt6_ex); | |
1375 | WARN_ON_ONCE(bucket->depth); | |
1376 | bucket++; | |
1377 | } | |
1378 | ||
1379 | out: | |
1380 | spin_unlock_bh(&rt6_exception_lock); | |
1381 | } | |
1382 | ||
1383 | /* Find cached rt in the hash table inside passed in rt | |
1384 | * Caller has to hold rcu_read_lock() | |
1385 | */ | |
1386 | static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt, | |
1387 | struct in6_addr *daddr, | |
1388 | struct in6_addr *saddr) | |
1389 | { | |
1390 | struct rt6_exception_bucket *bucket; | |
1391 | struct in6_addr *src_key = NULL; | |
1392 | struct rt6_exception *rt6_ex; | |
1393 | struct rt6_info *res = NULL; | |
1394 | ||
1395 | bucket = rcu_dereference(rt->rt6i_exception_bucket); | |
1396 | ||
1397 | #ifdef CONFIG_IPV6_SUBTREES | |
1398 | /* rt6i_src.plen != 0 indicates rt is in subtree | |
1399 | * and exception table is indexed by a hash of | |
1400 | * both rt6i_dst and rt6i_src. | |
1401 | * Otherwise, the exception table is indexed by | |
1402 | * a hash of only rt6i_dst. | |
1403 | */ | |
1404 | if (rt->rt6i_src.plen) | |
1405 | src_key = saddr; | |
1406 | #endif | |
1407 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); | |
1408 | ||
1409 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
1410 | res = rt6_ex->rt6i; | |
1411 | ||
1412 | return res; | |
1413 | } | |
1414 | ||
1415 | /* Remove the passed in cached rt from the hash table that contains it */ | |
1416 | int rt6_remove_exception_rt(struct rt6_info *rt) | |
1417 | { | |
1418 | struct rt6_info *from = (struct rt6_info *)rt->dst.from; | |
1419 | struct rt6_exception_bucket *bucket; | |
1420 | struct in6_addr *src_key = NULL; | |
1421 | struct rt6_exception *rt6_ex; | |
1422 | int err; | |
1423 | ||
1424 | if (!from || | |
442d713b | 1425 | !(rt->rt6i_flags & RTF_CACHE)) |
35732d01 WW |
1426 | return -EINVAL; |
1427 | ||
1428 | if (!rcu_access_pointer(from->rt6i_exception_bucket)) | |
1429 | return -ENOENT; | |
1430 | ||
1431 | spin_lock_bh(&rt6_exception_lock); | |
1432 | bucket = rcu_dereference_protected(from->rt6i_exception_bucket, | |
1433 | lockdep_is_held(&rt6_exception_lock)); | |
1434 | #ifdef CONFIG_IPV6_SUBTREES | |
1435 | /* rt6i_src.plen != 0 indicates 'from' is in subtree | |
1436 | * and exception table is indexed by a hash of | |
1437 | * both rt6i_dst and rt6i_src. | |
1438 | * Otherwise, the exception table is indexed by | |
1439 | * a hash of only rt6i_dst. | |
1440 | */ | |
1441 | if (from->rt6i_src.plen) | |
1442 | src_key = &rt->rt6i_src.addr; | |
1443 | #endif | |
1444 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1445 | &rt->rt6i_dst.addr, | |
1446 | src_key); | |
1447 | if (rt6_ex) { | |
1448 | rt6_remove_exception(bucket, rt6_ex); | |
1449 | err = 0; | |
1450 | } else { | |
1451 | err = -ENOENT; | |
1452 | } | |
1453 | ||
1454 | spin_unlock_bh(&rt6_exception_lock); | |
1455 | return err; | |
1456 | } | |
1457 | ||
1458 | /* Find rt6_ex which contains the passed in rt cache and | |
1459 | * refresh its stamp | |
1460 | */ | |
1461 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) | |
1462 | { | |
1463 | struct rt6_info *from = (struct rt6_info *)rt->dst.from; | |
1464 | struct rt6_exception_bucket *bucket; | |
1465 | struct in6_addr *src_key = NULL; | |
1466 | struct rt6_exception *rt6_ex; | |
1467 | ||
1468 | if (!from || | |
442d713b | 1469 | !(rt->rt6i_flags & RTF_CACHE)) |
35732d01 WW |
1470 | return; |
1471 | ||
1472 | rcu_read_lock(); | |
1473 | bucket = rcu_dereference(from->rt6i_exception_bucket); | |
1474 | ||
1475 | #ifdef CONFIG_IPV6_SUBTREES | |
1476 | /* rt6i_src.plen != 0 indicates 'from' is in subtree | |
1477 | * and exception table is indexed by a hash of | |
1478 | * both rt6i_dst and rt6i_src. | |
1479 | * Otherwise, the exception table is indexed by | |
1480 | * a hash of only rt6i_dst. | |
1481 | */ | |
1482 | if (from->rt6i_src.plen) | |
1483 | src_key = &rt->rt6i_src.addr; | |
1484 | #endif | |
1485 | rt6_ex = __rt6_find_exception_rcu(&bucket, | |
1486 | &rt->rt6i_dst.addr, | |
1487 | src_key); | |
1488 | if (rt6_ex) | |
1489 | rt6_ex->stamp = jiffies; | |
1490 | ||
1491 | rcu_read_unlock(); | |
1492 | } | |
1493 | ||
60006a48 WW |
1494 | static void rt6_exceptions_remove_prefsrc(struct rt6_info *rt) |
1495 | { | |
1496 | struct rt6_exception_bucket *bucket; | |
1497 | struct rt6_exception *rt6_ex; | |
1498 | int i; | |
1499 | ||
1500 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1501 | lockdep_is_held(&rt6_exception_lock)); | |
1502 | ||
1503 | if (bucket) { | |
1504 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1505 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1506 | rt6_ex->rt6i->rt6i_prefsrc.plen = 0; | |
1507 | } | |
1508 | bucket++; | |
1509 | } | |
1510 | } | |
1511 | } | |
1512 | ||
f5bbe7ee WW |
1513 | static void rt6_exceptions_update_pmtu(struct rt6_info *rt, int mtu) |
1514 | { | |
1515 | struct rt6_exception_bucket *bucket; | |
1516 | struct rt6_exception *rt6_ex; | |
1517 | int i; | |
1518 | ||
1519 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1520 | lockdep_is_held(&rt6_exception_lock)); | |
1521 | ||
1522 | if (bucket) { | |
1523 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1524 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1525 | struct rt6_info *entry = rt6_ex->rt6i; | |
1526 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
1527 | * (i.e. a redirected route), | |
1528 | * the metrics of its rt->dst.from has already | |
1529 | * been updated. | |
1530 | */ | |
1531 | if (entry->rt6i_pmtu && entry->rt6i_pmtu > mtu) | |
1532 | entry->rt6i_pmtu = mtu; | |
1533 | } | |
1534 | bucket++; | |
1535 | } | |
1536 | } | |
1537 | } | |
1538 | ||
b16cb459 WW |
1539 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
1540 | ||
1541 | static void rt6_exceptions_clean_tohost(struct rt6_info *rt, | |
1542 | struct in6_addr *gateway) | |
1543 | { | |
1544 | struct rt6_exception_bucket *bucket; | |
1545 | struct rt6_exception *rt6_ex; | |
1546 | struct hlist_node *tmp; | |
1547 | int i; | |
1548 | ||
1549 | if (!rcu_access_pointer(rt->rt6i_exception_bucket)) | |
1550 | return; | |
1551 | ||
1552 | spin_lock_bh(&rt6_exception_lock); | |
1553 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1554 | lockdep_is_held(&rt6_exception_lock)); | |
1555 | ||
1556 | if (bucket) { | |
1557 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1558 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
1559 | &bucket->chain, hlist) { | |
1560 | struct rt6_info *entry = rt6_ex->rt6i; | |
1561 | ||
1562 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
1563 | RTF_CACHE_GATEWAY && | |
1564 | ipv6_addr_equal(gateway, | |
1565 | &entry->rt6i_gateway)) { | |
1566 | rt6_remove_exception(bucket, rt6_ex); | |
1567 | } | |
1568 | } | |
1569 | bucket++; | |
1570 | } | |
1571 | } | |
1572 | ||
1573 | spin_unlock_bh(&rt6_exception_lock); | |
1574 | } | |
1575 | ||
c757faa8 WW |
1576 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
1577 | struct rt6_exception *rt6_ex, | |
1578 | struct fib6_gc_args *gc_args, | |
1579 | unsigned long now) | |
1580 | { | |
1581 | struct rt6_info *rt = rt6_ex->rt6i; | |
1582 | ||
1859bac0 PA |
1583 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
1584 | * even if others have still references to them, so that on next | |
1585 | * dst_check() such references can be dropped. | |
1586 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
1587 | * expired, independently from their aging, as per RFC 8201 section 4 | |
1588 | */ | |
1589 | if (!(rt->rt6i_flags & RTF_EXPIRES) && | |
c757faa8 WW |
1590 | time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { |
1591 | RT6_TRACE("aging clone %p\n", rt); | |
1592 | rt6_remove_exception(bucket, rt6_ex); | |
1593 | return; | |
1594 | } else if (rt->rt6i_flags & RTF_GATEWAY) { | |
1595 | struct neighbour *neigh; | |
1596 | __u8 neigh_flags = 0; | |
1597 | ||
1598 | neigh = dst_neigh_lookup(&rt->dst, &rt->rt6i_gateway); | |
1599 | if (neigh) { | |
1600 | neigh_flags = neigh->flags; | |
1601 | neigh_release(neigh); | |
1602 | } | |
1603 | if (!(neigh_flags & NTF_ROUTER)) { | |
1604 | RT6_TRACE("purging route %p via non-router but gateway\n", | |
1605 | rt); | |
1606 | rt6_remove_exception(bucket, rt6_ex); | |
1607 | return; | |
1608 | } | |
1859bac0 PA |
1609 | } else if (__rt6_check_expired(rt)) { |
1610 | RT6_TRACE("purging expired route %p\n", rt); | |
1611 | rt6_remove_exception(bucket, rt6_ex); | |
1612 | return; | |
c757faa8 WW |
1613 | } |
1614 | gc_args->more++; | |
1615 | } | |
1616 | ||
1617 | void rt6_age_exceptions(struct rt6_info *rt, | |
1618 | struct fib6_gc_args *gc_args, | |
1619 | unsigned long now) | |
1620 | { | |
1621 | struct rt6_exception_bucket *bucket; | |
1622 | struct rt6_exception *rt6_ex; | |
1623 | struct hlist_node *tmp; | |
1624 | int i; | |
1625 | ||
1626 | if (!rcu_access_pointer(rt->rt6i_exception_bucket)) | |
1627 | return; | |
1628 | ||
1629 | spin_lock_bh(&rt6_exception_lock); | |
1630 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1631 | lockdep_is_held(&rt6_exception_lock)); | |
1632 | ||
1633 | if (bucket) { | |
1634 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1635 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
1636 | &bucket->chain, hlist) { | |
1637 | rt6_age_examine_exception(bucket, rt6_ex, | |
1638 | gc_args, now); | |
1639 | } | |
1640 | bucket++; | |
1641 | } | |
1642 | } | |
1643 | spin_unlock_bh(&rt6_exception_lock); | |
1644 | } | |
1645 | ||
9ff74384 DA |
1646 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
1647 | int oif, struct flowi6 *fl6, int flags) | |
1da177e4 | 1648 | { |
367efcb9 | 1649 | struct fib6_node *fn, *saved_fn; |
2b760fcf | 1650 | struct rt6_info *rt, *rt_cache; |
c71099ac | 1651 | int strict = 0; |
1da177e4 | 1652 | |
77d16f45 | 1653 | strict |= flags & RT6_LOOKUP_F_IFACE; |
d5d32e4b | 1654 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; |
367efcb9 MKL |
1655 | if (net->ipv6.devconf_all->forwarding == 0) |
1656 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1657 | |
66f5d6ce | 1658 | rcu_read_lock(); |
1da177e4 | 1659 | |
4c9483b2 | 1660 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1661 | saved_fn = fn; |
1da177e4 | 1662 | |
ca254490 DA |
1663 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1664 | oif = 0; | |
1665 | ||
a3c00e46 | 1666 | redo_rt6_select: |
8d1040e8 | 1667 | rt = rt6_select(net, fn, oif, strict); |
52bd4c0c | 1668 | if (rt->rt6i_nsiblings) |
367efcb9 | 1669 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1670 | if (rt == net->ipv6.ip6_null_entry) { |
1671 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1672 | if (fn) | |
1673 | goto redo_rt6_select; | |
367efcb9 MKL |
1674 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1675 | /* also consider unreachable route */ | |
1676 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1677 | fn = saved_fn; | |
1678 | goto redo_rt6_select; | |
367efcb9 | 1679 | } |
a3c00e46 MKL |
1680 | } |
1681 | ||
2b760fcf WW |
1682 | /*Search through exception table */ |
1683 | rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr); | |
1684 | if (rt_cache) | |
1685 | rt = rt_cache; | |
fb9de91e | 1686 | |
d3843fe5 | 1687 | if (rt == net->ipv6.ip6_null_entry) { |
66f5d6ce | 1688 | rcu_read_unlock(); |
d3843fe5 | 1689 | dst_hold(&rt->dst); |
b65f164d | 1690 | trace_fib6_table_lookup(net, rt, table, fl6); |
d3843fe5 WW |
1691 | return rt; |
1692 | } else if (rt->rt6i_flags & RTF_CACHE) { | |
1693 | if (ip6_hold_safe(net, &rt, true)) { | |
1694 | dst_use_noref(&rt->dst, jiffies); | |
1695 | rt6_dst_from_metrics_check(rt); | |
1696 | } | |
66f5d6ce | 1697 | rcu_read_unlock(); |
b65f164d | 1698 | trace_fib6_table_lookup(net, rt, table, fl6); |
d52d3997 | 1699 | return rt; |
3da59bd9 MKL |
1700 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1701 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1702 | /* Create a RTF_CACHE clone which will not be | |
1703 | * owned by the fib6 tree. It is for the special case where | |
1704 | * the daddr in the skb during the neighbor look-up is different | |
1705 | * from the fl6->daddr used to look-up route here. | |
1706 | */ | |
1707 | ||
1708 | struct rt6_info *uncached_rt; | |
1709 | ||
d3843fe5 WW |
1710 | if (ip6_hold_safe(net, &rt, true)) { |
1711 | dst_use_noref(&rt->dst, jiffies); | |
1712 | } else { | |
66f5d6ce | 1713 | rcu_read_unlock(); |
d3843fe5 WW |
1714 | uncached_rt = rt; |
1715 | goto uncached_rt_out; | |
1716 | } | |
66f5d6ce | 1717 | rcu_read_unlock(); |
d52d3997 | 1718 | |
3da59bd9 MKL |
1719 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1720 | dst_release(&rt->dst); | |
c71099ac | 1721 | |
1cfb71ee WW |
1722 | if (uncached_rt) { |
1723 | /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc() | |
1724 | * No need for another dst_hold() | |
1725 | */ | |
8d0b94af | 1726 | rt6_uncached_list_add(uncached_rt); |
81eb8447 | 1727 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1cfb71ee | 1728 | } else { |
3da59bd9 | 1729 | uncached_rt = net->ipv6.ip6_null_entry; |
1cfb71ee WW |
1730 | dst_hold(&uncached_rt->dst); |
1731 | } | |
b811580d | 1732 | |
d3843fe5 | 1733 | uncached_rt_out: |
b65f164d | 1734 | trace_fib6_table_lookup(net, uncached_rt, table, fl6); |
3da59bd9 | 1735 | return uncached_rt; |
3da59bd9 | 1736 | |
d52d3997 MKL |
1737 | } else { |
1738 | /* Get a percpu copy */ | |
1739 | ||
1740 | struct rt6_info *pcpu_rt; | |
1741 | ||
d3843fe5 | 1742 | dst_use_noref(&rt->dst, jiffies); |
951f788a | 1743 | local_bh_disable(); |
d52d3997 | 1744 | pcpu_rt = rt6_get_pcpu_route(rt); |
d52d3997 | 1745 | |
951f788a | 1746 | if (!pcpu_rt) { |
a94b9367 WW |
1747 | /* atomic_inc_not_zero() is needed when using rcu */ |
1748 | if (atomic_inc_not_zero(&rt->rt6i_ref)) { | |
951f788a | 1749 | /* No dst_hold() on rt is needed because grabbing |
a94b9367 WW |
1750 | * rt->rt6i_ref makes sure rt can't be released. |
1751 | */ | |
a94b9367 WW |
1752 | pcpu_rt = rt6_make_pcpu_route(rt); |
1753 | rt6_release(rt); | |
1754 | } else { | |
1755 | /* rt is already removed from tree */ | |
a94b9367 WW |
1756 | pcpu_rt = net->ipv6.ip6_null_entry; |
1757 | dst_hold(&pcpu_rt->dst); | |
1758 | } | |
9c7370a1 | 1759 | } |
951f788a ED |
1760 | local_bh_enable(); |
1761 | rcu_read_unlock(); | |
b65f164d | 1762 | trace_fib6_table_lookup(net, pcpu_rt, table, fl6); |
d52d3997 MKL |
1763 | return pcpu_rt; |
1764 | } | |
1da177e4 | 1765 | } |
9ff74384 | 1766 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 1767 | |
8ed67789 | 1768 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1769 | struct flowi6 *fl6, int flags) |
4acad72d | 1770 | { |
4c9483b2 | 1771 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1772 | } |
1773 | ||
d409b847 MB |
1774 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
1775 | struct net_device *dev, | |
1776 | struct flowi6 *fl6, int flags) | |
72331bc0 SL |
1777 | { |
1778 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1779 | flags |= RT6_LOOKUP_F_IFACE; | |
1780 | ||
1781 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1782 | } | |
d409b847 | 1783 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 1784 | |
23aebdac JS |
1785 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
1786 | struct flow_keys *keys) | |
1787 | { | |
1788 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
1789 | const struct ipv6hdr *key_iph = outer_iph; | |
1790 | const struct ipv6hdr *inner_iph; | |
1791 | const struct icmp6hdr *icmph; | |
1792 | struct ipv6hdr _inner_iph; | |
1793 | ||
1794 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
1795 | goto out; | |
1796 | ||
1797 | icmph = icmp6_hdr(skb); | |
1798 | if (icmph->icmp6_type != ICMPV6_DEST_UNREACH && | |
1799 | icmph->icmp6_type != ICMPV6_PKT_TOOBIG && | |
1800 | icmph->icmp6_type != ICMPV6_TIME_EXCEED && | |
1801 | icmph->icmp6_type != ICMPV6_PARAMPROB) | |
1802 | goto out; | |
1803 | ||
1804 | inner_iph = skb_header_pointer(skb, | |
1805 | skb_transport_offset(skb) + sizeof(*icmph), | |
1806 | sizeof(_inner_iph), &_inner_iph); | |
1807 | if (!inner_iph) | |
1808 | goto out; | |
1809 | ||
1810 | key_iph = inner_iph; | |
1811 | out: | |
1812 | memset(keys, 0, sizeof(*keys)); | |
1813 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1814 | keys->addrs.v6addrs.src = key_iph->saddr; | |
1815 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
1816 | keys->tags.flow_label = ip6_flowinfo(key_iph); | |
1817 | keys->basic.ip_proto = key_iph->nexthdr; | |
1818 | } | |
1819 | ||
1820 | /* if skb is set it will be used and fl6 can be NULL */ | |
1821 | u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb) | |
1822 | { | |
1823 | struct flow_keys hash_keys; | |
1824 | ||
1825 | if (skb) { | |
1826 | ip6_multipath_l3_keys(skb, &hash_keys); | |
1827 | return flow_hash_from_keys(&hash_keys); | |
1828 | } | |
1829 | ||
1830 | return get_hash_from_flowi6(fl6); | |
1831 | } | |
1832 | ||
c71099ac TG |
1833 | void ip6_route_input(struct sk_buff *skb) |
1834 | { | |
b71d1d42 | 1835 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1836 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1837 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1838 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1839 | struct flowi6 fl6 = { |
e0d56fdd | 1840 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
1841 | .daddr = iph->daddr, |
1842 | .saddr = iph->saddr, | |
6502ca52 | 1843 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1844 | .flowi6_mark = skb->mark, |
1845 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1846 | }; |
adaa70bb | 1847 | |
904af04d | 1848 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1849 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1850 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
23aebdac JS |
1851 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
1852 | fl6.mp_hash = rt6_multipath_hash(&fl6, skb); | |
06e9d040 | 1853 | skb_dst_drop(skb); |
72331bc0 | 1854 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1855 | } |
1856 | ||
8ed67789 | 1857 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1858 | struct flowi6 *fl6, int flags) |
1da177e4 | 1859 | { |
4c9483b2 | 1860 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1861 | } |
1862 | ||
6f21c96a PA |
1863 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
1864 | struct flowi6 *fl6, int flags) | |
c71099ac | 1865 | { |
d46a9d67 | 1866 | bool any_src; |
c71099ac | 1867 | |
4c1feac5 DA |
1868 | if (rt6_need_strict(&fl6->daddr)) { |
1869 | struct dst_entry *dst; | |
1870 | ||
1871 | dst = l3mdev_link_scope_lookup(net, fl6); | |
1872 | if (dst) | |
1873 | return dst; | |
1874 | } | |
ca254490 | 1875 | |
1fb9489b | 1876 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1877 | |
d46a9d67 | 1878 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1879 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1880 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1881 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1882 | |
d46a9d67 | 1883 | if (!any_src) |
adaa70bb | 1884 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1885 | else if (sk) |
1886 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1887 | |
4c9483b2 | 1888 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1889 | } |
6f21c96a | 1890 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 1891 | |
2774c131 | 1892 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1893 | { |
5c1e6aa3 | 1894 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 1895 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
1896 | struct dst_entry *new = NULL; |
1897 | ||
1dbe3252 | 1898 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 1899 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 1900 | if (rt) { |
0a1f5962 | 1901 | rt6_info_init(rt); |
81eb8447 | 1902 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 1903 | |
0a1f5962 | 1904 | new = &rt->dst; |
14e50e57 | 1905 | new->__use = 1; |
352e512c | 1906 | new->input = dst_discard; |
ede2059d | 1907 | new->output = dst_discard_out; |
14e50e57 | 1908 | |
0a1f5962 | 1909 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 1910 | |
1dbe3252 | 1911 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 1912 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1913 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1914 | rt->rt6i_metric = 0; |
1915 | ||
1916 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1917 | #ifdef CONFIG_IPV6_SUBTREES | |
1918 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1919 | #endif | |
14e50e57 DM |
1920 | } |
1921 | ||
69ead7af DM |
1922 | dst_release(dst_orig); |
1923 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1924 | } |
14e50e57 | 1925 | |
1da177e4 LT |
1926 | /* |
1927 | * Destination cache support functions | |
1928 | */ | |
1929 | ||
4b32b5ad MKL |
1930 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1931 | { | |
1932 | if (rt->dst.from && | |
1933 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1934 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1935 | } | |
1936 | ||
3da59bd9 MKL |
1937 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1938 | { | |
36143645 | 1939 | u32 rt_cookie = 0; |
c5cff856 WW |
1940 | |
1941 | if (!rt6_get_cookie_safe(rt, &rt_cookie) || rt_cookie != cookie) | |
3da59bd9 MKL |
1942 | return NULL; |
1943 | ||
1944 | if (rt6_check_expired(rt)) | |
1945 | return NULL; | |
1946 | ||
1947 | return &rt->dst; | |
1948 | } | |
1949 | ||
1950 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1951 | { | |
5973fb1e MKL |
1952 | if (!__rt6_check_expired(rt) && |
1953 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3da59bd9 MKL |
1954 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) |
1955 | return &rt->dst; | |
1956 | else | |
1957 | return NULL; | |
1958 | } | |
1959 | ||
1da177e4 LT |
1960 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1961 | { | |
1962 | struct rt6_info *rt; | |
1963 | ||
1964 | rt = (struct rt6_info *) dst; | |
1965 | ||
6f3118b5 ND |
1966 | /* All IPV6 dsts are created with ->obsolete set to the value |
1967 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1968 | * into this function always. | |
1969 | */ | |
e3bc10bd | 1970 | |
4b32b5ad MKL |
1971 | rt6_dst_from_metrics_check(rt); |
1972 | ||
02bcf4e0 | 1973 | if (rt->rt6i_flags & RTF_PCPU || |
a4c2fd7f | 1974 | (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from)) |
3da59bd9 MKL |
1975 | return rt6_dst_from_check(rt, cookie); |
1976 | else | |
1977 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1978 | } |
1979 | ||
1980 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1981 | { | |
1982 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1983 | ||
1984 | if (rt) { | |
54c1a859 YH |
1985 | if (rt->rt6i_flags & RTF_CACHE) { |
1986 | if (rt6_check_expired(rt)) { | |
1987 | ip6_del_rt(rt); | |
1988 | dst = NULL; | |
1989 | } | |
1990 | } else { | |
1da177e4 | 1991 | dst_release(dst); |
54c1a859 YH |
1992 | dst = NULL; |
1993 | } | |
1da177e4 | 1994 | } |
54c1a859 | 1995 | return dst; |
1da177e4 LT |
1996 | } |
1997 | ||
1998 | static void ip6_link_failure(struct sk_buff *skb) | |
1999 | { | |
2000 | struct rt6_info *rt; | |
2001 | ||
3ffe533c | 2002 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2003 | |
adf30907 | 2004 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2005 | if (rt) { |
1eb4f758 | 2006 | if (rt->rt6i_flags & RTF_CACHE) { |
ad65a2f0 WW |
2007 | if (dst_hold_safe(&rt->dst)) |
2008 | ip6_del_rt(rt); | |
c5cff856 WW |
2009 | } else { |
2010 | struct fib6_node *fn; | |
2011 | ||
2012 | rcu_read_lock(); | |
2013 | fn = rcu_dereference(rt->rt6i_node); | |
2014 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
2015 | fn->fn_sernum = -1; | |
2016 | rcu_read_unlock(); | |
1eb4f758 | 2017 | } |
1da177e4 LT |
2018 | } |
2019 | } | |
2020 | ||
45e4fd26 MKL |
2021 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2022 | { | |
2023 | struct net *net = dev_net(rt->dst.dev); | |
2024 | ||
2025 | rt->rt6i_flags |= RTF_MODIFIED; | |
2026 | rt->rt6i_pmtu = mtu; | |
2027 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
2028 | } | |
2029 | ||
0d3f6d29 MKL |
2030 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2031 | { | |
2032 | return !(rt->rt6i_flags & RTF_CACHE) && | |
4e587ea7 WW |
2033 | (rt->rt6i_flags & RTF_PCPU || |
2034 | rcu_access_pointer(rt->rt6i_node)); | |
0d3f6d29 MKL |
2035 | } |
2036 | ||
45e4fd26 MKL |
2037 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
2038 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 2039 | { |
0dec879f | 2040 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2041 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2042 | |
45e4fd26 MKL |
2043 | if (rt6->rt6i_flags & RTF_LOCAL) |
2044 | return; | |
81aded24 | 2045 | |
19bda36c XL |
2046 | if (dst_metric_locked(dst, RTAX_MTU)) |
2047 | return; | |
2048 | ||
0dec879f JA |
2049 | if (iph) { |
2050 | daddr = &iph->daddr; | |
2051 | saddr = &iph->saddr; | |
2052 | } else if (sk) { | |
2053 | daddr = &sk->sk_v6_daddr; | |
2054 | saddr = &inet6_sk(sk)->saddr; | |
2055 | } else { | |
2056 | daddr = NULL; | |
2057 | saddr = NULL; | |
2058 | } | |
2059 | dst_confirm_neigh(dst, daddr); | |
45e4fd26 MKL |
2060 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
2061 | if (mtu >= dst_mtu(dst)) | |
2062 | return; | |
9d289715 | 2063 | |
0d3f6d29 | 2064 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2065 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2066 | /* update rt6_ex->stamp for cache */ |
2067 | if (rt6->rt6i_flags & RTF_CACHE) | |
2068 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2069 | } else if (daddr) { |
45e4fd26 MKL |
2070 | struct rt6_info *nrt6; |
2071 | ||
45e4fd26 MKL |
2072 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); |
2073 | if (nrt6) { | |
2074 | rt6_do_update_pmtu(nrt6, mtu); | |
2b760fcf WW |
2075 | if (rt6_insert_exception(nrt6, rt6)) |
2076 | dst_release_immediate(&nrt6->dst); | |
45e4fd26 | 2077 | } |
1da177e4 LT |
2078 | } |
2079 | } | |
2080 | ||
45e4fd26 MKL |
2081 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2082 | struct sk_buff *skb, u32 mtu) | |
2083 | { | |
2084 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
2085 | } | |
2086 | ||
42ae66c8 | 2087 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2088 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2089 | { |
2090 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2091 | struct dst_entry *dst; | |
2092 | struct flowi6 fl6; | |
2093 | ||
2094 | memset(&fl6, 0, sizeof(fl6)); | |
2095 | fl6.flowi6_oif = oif; | |
1b3c61dc | 2096 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
2097 | fl6.daddr = iph->daddr; |
2098 | fl6.saddr = iph->saddr; | |
6502ca52 | 2099 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 2100 | fl6.flowi6_uid = uid; |
81aded24 DM |
2101 | |
2102 | dst = ip6_route_output(net, NULL, &fl6); | |
2103 | if (!dst->error) | |
45e4fd26 | 2104 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
2105 | dst_release(dst); |
2106 | } | |
2107 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2108 | ||
2109 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2110 | { | |
33c162a9 MKL |
2111 | struct dst_entry *dst; |
2112 | ||
81aded24 | 2113 | ip6_update_pmtu(skb, sock_net(sk), mtu, |
e2d118a1 | 2114 | sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid); |
33c162a9 MKL |
2115 | |
2116 | dst = __sk_dst_get(sk); | |
2117 | if (!dst || !dst->obsolete || | |
2118 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2119 | return; | |
2120 | ||
2121 | bh_lock_sock(sk); | |
2122 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2123 | ip6_datagram_dst_update(sk, false); | |
2124 | bh_unlock_sock(sk); | |
81aded24 DM |
2125 | } |
2126 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2127 | ||
b55b76b2 DJ |
2128 | /* Handle redirects */ |
2129 | struct ip6rd_flowi { | |
2130 | struct flowi6 fl6; | |
2131 | struct in6_addr gateway; | |
2132 | }; | |
2133 | ||
2134 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
2135 | struct fib6_table *table, | |
2136 | struct flowi6 *fl6, | |
2137 | int flags) | |
2138 | { | |
2139 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
2b760fcf | 2140 | struct rt6_info *rt, *rt_cache; |
b55b76b2 DJ |
2141 | struct fib6_node *fn; |
2142 | ||
2143 | /* Get the "current" route for this destination and | |
67c408cf | 2144 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
2145 | * |
2146 | * RFC 4861 specifies that redirects should only be | |
2147 | * accepted if they come from the nexthop to the target. | |
2148 | * Due to the way the routes are chosen, this notion | |
2149 | * is a bit fuzzy and one might need to check all possible | |
2150 | * routes. | |
2151 | */ | |
2152 | ||
66f5d6ce | 2153 | rcu_read_lock(); |
b55b76b2 DJ |
2154 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
2155 | restart: | |
66f5d6ce | 2156 | for_each_fib6_node_rt_rcu(fn) { |
b55b76b2 DJ |
2157 | if (rt6_check_expired(rt)) |
2158 | continue; | |
2159 | if (rt->dst.error) | |
2160 | break; | |
2161 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
2162 | continue; | |
2163 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
2164 | continue; | |
2b760fcf WW |
2165 | /* rt_cache's gateway might be different from its 'parent' |
2166 | * in the case of an ip redirect. | |
2167 | * So we keep searching in the exception table if the gateway | |
2168 | * is different. | |
2169 | */ | |
2170 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) { | |
2171 | rt_cache = rt6_find_cached_rt(rt, | |
2172 | &fl6->daddr, | |
2173 | &fl6->saddr); | |
2174 | if (rt_cache && | |
2175 | ipv6_addr_equal(&rdfl->gateway, | |
2176 | &rt_cache->rt6i_gateway)) { | |
2177 | rt = rt_cache; | |
2178 | break; | |
2179 | } | |
b55b76b2 | 2180 | continue; |
2b760fcf | 2181 | } |
b55b76b2 DJ |
2182 | break; |
2183 | } | |
2184 | ||
2185 | if (!rt) | |
2186 | rt = net->ipv6.ip6_null_entry; | |
2187 | else if (rt->dst.error) { | |
2188 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
2189 | goto out; |
2190 | } | |
2191 | ||
2192 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
2193 | fn = fib6_backtrack(fn, &fl6->saddr); |
2194 | if (fn) | |
2195 | goto restart; | |
b55b76b2 | 2196 | } |
a3c00e46 | 2197 | |
b0a1ba59 | 2198 | out: |
d3843fe5 | 2199 | ip6_hold_safe(net, &rt, true); |
b55b76b2 | 2200 | |
66f5d6ce | 2201 | rcu_read_unlock(); |
b55b76b2 | 2202 | |
b65f164d | 2203 | trace_fib6_table_lookup(net, rt, table, fl6); |
b55b76b2 DJ |
2204 | return rt; |
2205 | }; | |
2206 | ||
2207 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
2208 | const struct flowi6 *fl6, | |
2209 | const struct in6_addr *gateway) | |
2210 | { | |
2211 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
2212 | struct ip6rd_flowi rdfl; | |
2213 | ||
2214 | rdfl.fl6 = *fl6; | |
2215 | rdfl.gateway = *gateway; | |
2216 | ||
2217 | return fib6_rule_lookup(net, &rdfl.fl6, | |
2218 | flags, __ip6_route_redirect); | |
2219 | } | |
2220 | ||
e2d118a1 LC |
2221 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
2222 | kuid_t uid) | |
3a5ad2ee DM |
2223 | { |
2224 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2225 | struct dst_entry *dst; | |
2226 | struct flowi6 fl6; | |
2227 | ||
2228 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 2229 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
2230 | fl6.flowi6_oif = oif; |
2231 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
2232 | fl6.daddr = iph->daddr; |
2233 | fl6.saddr = iph->saddr; | |
6502ca52 | 2234 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 2235 | fl6.flowi6_uid = uid; |
3a5ad2ee | 2236 | |
b55b76b2 DJ |
2237 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
2238 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
2239 | dst_release(dst); |
2240 | } | |
2241 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
2242 | ||
c92a59ec DJ |
2243 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
2244 | u32 mark) | |
2245 | { | |
2246 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
2247 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
2248 | struct dst_entry *dst; | |
2249 | struct flowi6 fl6; | |
2250 | ||
2251 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 2252 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
2253 | fl6.flowi6_oif = oif; |
2254 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
2255 | fl6.daddr = msg->dest; |
2256 | fl6.saddr = iph->daddr; | |
e2d118a1 | 2257 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
c92a59ec | 2258 | |
b55b76b2 DJ |
2259 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
2260 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
2261 | dst_release(dst); |
2262 | } | |
2263 | ||
3a5ad2ee DM |
2264 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
2265 | { | |
e2d118a1 LC |
2266 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
2267 | sk->sk_uid); | |
3a5ad2ee DM |
2268 | } |
2269 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
2270 | ||
0dbaee3b | 2271 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 2272 | { |
0dbaee3b DM |
2273 | struct net_device *dev = dst->dev; |
2274 | unsigned int mtu = dst_mtu(dst); | |
2275 | struct net *net = dev_net(dev); | |
2276 | ||
1da177e4 LT |
2277 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
2278 | ||
5578689a DL |
2279 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
2280 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
2281 | |
2282 | /* | |
1ab1457c YH |
2283 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
2284 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
2285 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
2286 | * rely only on pmtu discovery" |
2287 | */ | |
2288 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
2289 | mtu = IPV6_MAXPLEN; | |
2290 | return mtu; | |
2291 | } | |
2292 | ||
ebb762f2 | 2293 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 2294 | { |
4b32b5ad MKL |
2295 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
2296 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 2297 | struct inet6_dev *idev; |
618f9bc7 | 2298 | |
4b32b5ad MKL |
2299 | if (mtu) |
2300 | goto out; | |
2301 | ||
2302 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 2303 | if (mtu) |
30f78d8e | 2304 | goto out; |
618f9bc7 SK |
2305 | |
2306 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
2307 | |
2308 | rcu_read_lock(); | |
2309 | idev = __in6_dev_get(dst->dev); | |
2310 | if (idev) | |
2311 | mtu = idev->cnf.mtu6; | |
2312 | rcu_read_unlock(); | |
2313 | ||
30f78d8e | 2314 | out: |
14972cbd RP |
2315 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
2316 | ||
2317 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
2318 | } |
2319 | ||
3b00944c | 2320 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 2321 | struct flowi6 *fl6) |
1da177e4 | 2322 | { |
87a11578 | 2323 | struct dst_entry *dst; |
1da177e4 LT |
2324 | struct rt6_info *rt; |
2325 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 2326 | struct net *net = dev_net(dev); |
1da177e4 | 2327 | |
38308473 | 2328 | if (unlikely(!idev)) |
122bdf67 | 2329 | return ERR_PTR(-ENODEV); |
1da177e4 | 2330 | |
ad706862 | 2331 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 2332 | if (unlikely(!rt)) { |
1da177e4 | 2333 | in6_dev_put(idev); |
87a11578 | 2334 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
2335 | goto out; |
2336 | } | |
2337 | ||
8e2ec639 | 2338 | rt->dst.flags |= DST_HOST; |
588753f1 | 2339 | rt->dst.input = ip6_input; |
8e2ec639 | 2340 | rt->dst.output = ip6_output; |
550bab42 | 2341 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 2342 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
2343 | rt->rt6i_dst.plen = 128; |
2344 | rt->rt6i_idev = idev; | |
14edd87d | 2345 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 2346 | |
587fea74 WW |
2347 | /* Add this dst into uncached_list so that rt6_ifdown() can |
2348 | * do proper release of the net_device | |
2349 | */ | |
2350 | rt6_uncached_list_add(rt); | |
81eb8447 | 2351 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1da177e4 | 2352 | |
87a11578 DM |
2353 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
2354 | ||
1da177e4 | 2355 | out: |
87a11578 | 2356 | return dst; |
1da177e4 LT |
2357 | } |
2358 | ||
569d3645 | 2359 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 2360 | { |
86393e52 | 2361 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
2362 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
2363 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
2364 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2365 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2366 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 2367 | int entries; |
7019b78e | 2368 | |
fc66f95c | 2369 | entries = dst_entries_get_fast(ops); |
49a18d86 | 2370 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 2371 | entries <= rt_max_size) |
1da177e4 LT |
2372 | goto out; |
2373 | ||
6891a346 | 2374 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 2375 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
2376 | entries = dst_entries_get_slow(ops); |
2377 | if (entries < ops->gc_thresh) | |
7019b78e | 2378 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 2379 | out: |
7019b78e | 2380 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 2381 | return entries > rt_max_size; |
1da177e4 LT |
2382 | } |
2383 | ||
e715b6d3 FW |
2384 | static int ip6_convert_metrics(struct mx6_config *mxc, |
2385 | const struct fib6_config *cfg) | |
2386 | { | |
6670e152 | 2387 | struct net *net = cfg->fc_nlinfo.nl_net; |
c3a8d947 | 2388 | bool ecn_ca = false; |
e715b6d3 FW |
2389 | struct nlattr *nla; |
2390 | int remaining; | |
2391 | u32 *mp; | |
2392 | ||
63159f29 | 2393 | if (!cfg->fc_mx) |
e715b6d3 FW |
2394 | return 0; |
2395 | ||
2396 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
2397 | if (unlikely(!mp)) | |
2398 | return -ENOMEM; | |
2399 | ||
2400 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
2401 | int type = nla_type(nla); | |
1bb14807 | 2402 | u32 val; |
e715b6d3 | 2403 | |
1bb14807 DB |
2404 | if (!type) |
2405 | continue; | |
2406 | if (unlikely(type > RTAX_MAX)) | |
2407 | goto err; | |
ea697639 | 2408 | |
1bb14807 DB |
2409 | if (type == RTAX_CC_ALGO) { |
2410 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 2411 | |
1bb14807 | 2412 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
6670e152 | 2413 | val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca); |
1bb14807 DB |
2414 | if (val == TCP_CA_UNSPEC) |
2415 | goto err; | |
2416 | } else { | |
2417 | val = nla_get_u32(nla); | |
e715b6d3 | 2418 | } |
626abd59 PA |
2419 | if (type == RTAX_HOPLIMIT && val > 255) |
2420 | val = 255; | |
b8d3e416 DB |
2421 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
2422 | goto err; | |
1bb14807 DB |
2423 | |
2424 | mp[type - 1] = val; | |
2425 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
2426 | } |
2427 | ||
c3a8d947 DB |
2428 | if (ecn_ca) { |
2429 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
2430 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
2431 | } | |
e715b6d3 | 2432 | |
c3a8d947 | 2433 | mxc->mx = mp; |
e715b6d3 FW |
2434 | return 0; |
2435 | err: | |
2436 | kfree(mp); | |
2437 | return -EINVAL; | |
2438 | } | |
1da177e4 | 2439 | |
8c14586f DA |
2440 | static struct rt6_info *ip6_nh_lookup_table(struct net *net, |
2441 | struct fib6_config *cfg, | |
2442 | const struct in6_addr *gw_addr) | |
2443 | { | |
2444 | struct flowi6 fl6 = { | |
2445 | .flowi6_oif = cfg->fc_ifindex, | |
2446 | .daddr = *gw_addr, | |
2447 | .saddr = cfg->fc_prefsrc, | |
2448 | }; | |
2449 | struct fib6_table *table; | |
2450 | struct rt6_info *rt; | |
d5d32e4b | 2451 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f DA |
2452 | |
2453 | table = fib6_get_table(net, cfg->fc_table); | |
2454 | if (!table) | |
2455 | return NULL; | |
2456 | ||
2457 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
2458 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2459 | ||
2460 | rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags); | |
2461 | ||
2462 | /* if table lookup failed, fall back to full lookup */ | |
2463 | if (rt == net->ipv6.ip6_null_entry) { | |
2464 | ip6_rt_put(rt); | |
2465 | rt = NULL; | |
2466 | } | |
2467 | ||
2468 | return rt; | |
2469 | } | |
2470 | ||
333c4301 DA |
2471 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg, |
2472 | struct netlink_ext_ack *extack) | |
1da177e4 | 2473 | { |
5578689a | 2474 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
2475 | struct rt6_info *rt = NULL; |
2476 | struct net_device *dev = NULL; | |
2477 | struct inet6_dev *idev = NULL; | |
c71099ac | 2478 | struct fib6_table *table; |
1da177e4 | 2479 | int addr_type; |
8c5b83f0 | 2480 | int err = -EINVAL; |
1da177e4 | 2481 | |
557c44be | 2482 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
2483 | if (cfg->fc_flags & RTF_PCPU) { |
2484 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 2485 | goto out; |
d5d531cb | 2486 | } |
557c44be | 2487 | |
2ea2352e WW |
2488 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
2489 | if (cfg->fc_flags & RTF_CACHE) { | |
2490 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
2491 | goto out; | |
2492 | } | |
2493 | ||
d5d531cb DA |
2494 | if (cfg->fc_dst_len > 128) { |
2495 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
2496 | goto out; | |
2497 | } | |
2498 | if (cfg->fc_src_len > 128) { | |
2499 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 2500 | goto out; |
d5d531cb | 2501 | } |
1da177e4 | 2502 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
2503 | if (cfg->fc_src_len) { |
2504 | NL_SET_ERR_MSG(extack, | |
2505 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 2506 | goto out; |
d5d531cb | 2507 | } |
1da177e4 | 2508 | #endif |
86872cb5 | 2509 | if (cfg->fc_ifindex) { |
1da177e4 | 2510 | err = -ENODEV; |
5578689a | 2511 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
2512 | if (!dev) |
2513 | goto out; | |
2514 | idev = in6_dev_get(dev); | |
2515 | if (!idev) | |
2516 | goto out; | |
2517 | } | |
2518 | ||
86872cb5 TG |
2519 | if (cfg->fc_metric == 0) |
2520 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 2521 | |
d71314b4 | 2522 | err = -ENOBUFS; |
38308473 DM |
2523 | if (cfg->fc_nlinfo.nlh && |
2524 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 2525 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 2526 | if (!table) { |
f3213831 | 2527 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
2528 | table = fib6_new_table(net, cfg->fc_table); |
2529 | } | |
2530 | } else { | |
2531 | table = fib6_new_table(net, cfg->fc_table); | |
2532 | } | |
38308473 DM |
2533 | |
2534 | if (!table) | |
c71099ac | 2535 | goto out; |
c71099ac | 2536 | |
ad706862 MKL |
2537 | rt = ip6_dst_alloc(net, NULL, |
2538 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 2539 | |
38308473 | 2540 | if (!rt) { |
1da177e4 LT |
2541 | err = -ENOMEM; |
2542 | goto out; | |
2543 | } | |
2544 | ||
1716a961 G |
2545 | if (cfg->fc_flags & RTF_EXPIRES) |
2546 | rt6_set_expires(rt, jiffies + | |
2547 | clock_t_to_jiffies(cfg->fc_expires)); | |
2548 | else | |
2549 | rt6_clean_expires(rt); | |
1da177e4 | 2550 | |
86872cb5 TG |
2551 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
2552 | cfg->fc_protocol = RTPROT_BOOT; | |
2553 | rt->rt6i_protocol = cfg->fc_protocol; | |
2554 | ||
2555 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
2556 | |
2557 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 2558 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
2559 | else if (cfg->fc_flags & RTF_LOCAL) |
2560 | rt->dst.input = ip6_input; | |
1da177e4 | 2561 | else |
d8d1f30b | 2562 | rt->dst.input = ip6_forward; |
1da177e4 | 2563 | |
d8d1f30b | 2564 | rt->dst.output = ip6_output; |
1da177e4 | 2565 | |
19e42e45 RP |
2566 | if (cfg->fc_encap) { |
2567 | struct lwtunnel_state *lwtstate; | |
2568 | ||
30357d7d | 2569 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd | 2570 | cfg->fc_encap, AF_INET6, cfg, |
9ae28727 | 2571 | &lwtstate, extack); |
19e42e45 RP |
2572 | if (err) |
2573 | goto out; | |
61adedf3 JB |
2574 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
2575 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
2576 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
2577 | rt->dst.output = lwtunnel_output; | |
25368623 | 2578 | } |
61adedf3 JB |
2579 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
2580 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
2581 | rt->dst.input = lwtunnel_input; | |
25368623 | 2582 | } |
19e42e45 RP |
2583 | } |
2584 | ||
86872cb5 TG |
2585 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
2586 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 2587 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 2588 | rt->dst.flags |= DST_HOST; |
e5fd387a | 2589 | |
1da177e4 | 2590 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
2591 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
2592 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
2593 | #endif |
2594 | ||
86872cb5 | 2595 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
2596 | |
2597 | /* We cannot add true routes via loopback here, | |
2598 | they would result in kernel looping; promote them to reject routes | |
2599 | */ | |
86872cb5 | 2600 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
2601 | (dev && (dev->flags & IFF_LOOPBACK) && |
2602 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
2603 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 2604 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 2605 | if (dev != net->loopback_dev) { |
1da177e4 LT |
2606 | if (dev) { |
2607 | dev_put(dev); | |
2608 | in6_dev_put(idev); | |
2609 | } | |
5578689a | 2610 | dev = net->loopback_dev; |
1da177e4 LT |
2611 | dev_hold(dev); |
2612 | idev = in6_dev_get(dev); | |
2613 | if (!idev) { | |
2614 | err = -ENODEV; | |
2615 | goto out; | |
2616 | } | |
2617 | } | |
1da177e4 | 2618 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
2619 | switch (cfg->fc_type) { |
2620 | case RTN_BLACKHOLE: | |
2621 | rt->dst.error = -EINVAL; | |
ede2059d | 2622 | rt->dst.output = dst_discard_out; |
7150aede | 2623 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
2624 | break; |
2625 | case RTN_PROHIBIT: | |
2626 | rt->dst.error = -EACCES; | |
7150aede K |
2627 | rt->dst.output = ip6_pkt_prohibit_out; |
2628 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 2629 | break; |
b4949ab2 | 2630 | case RTN_THROW: |
0315e382 | 2631 | case RTN_UNREACHABLE: |
ef2c7d7b | 2632 | default: |
7150aede | 2633 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
2634 | : (cfg->fc_type == RTN_UNREACHABLE) |
2635 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
2636 | rt->dst.output = ip6_pkt_discard_out; |
2637 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
2638 | break; |
2639 | } | |
1da177e4 LT |
2640 | goto install_route; |
2641 | } | |
2642 | ||
86872cb5 | 2643 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 2644 | const struct in6_addr *gw_addr; |
1da177e4 LT |
2645 | int gwa_type; |
2646 | ||
86872cb5 | 2647 | gw_addr = &cfg->fc_gateway; |
330567b7 | 2648 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
2649 | |
2650 | /* if gw_addr is local we will fail to detect this in case | |
2651 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
2652 | * will return already-added prefix route via interface that | |
2653 | * prefix route was assigned to, which might be non-loopback. | |
2654 | */ | |
2655 | err = -EINVAL; | |
330567b7 FW |
2656 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
2657 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
d5d531cb DA |
2658 | dev : NULL, 0, 0)) { |
2659 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
48ed7b26 | 2660 | goto out; |
d5d531cb | 2661 | } |
4e3fd7a0 | 2662 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
2663 | |
2664 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
8c14586f | 2665 | struct rt6_info *grt = NULL; |
1da177e4 LT |
2666 | |
2667 | /* IPv6 strictly inhibits using not link-local | |
2668 | addresses as nexthop address. | |
2669 | Otherwise, router will not able to send redirects. | |
2670 | It is very good, but in some (rare!) circumstances | |
2671 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
2672 | some exceptions. --ANK | |
96d5822c EN |
2673 | We allow IPv4-mapped nexthops to support RFC4798-type |
2674 | addressing | |
1da177e4 | 2675 | */ |
96d5822c | 2676 | if (!(gwa_type & (IPV6_ADDR_UNICAST | |
d5d531cb DA |
2677 | IPV6_ADDR_MAPPED))) { |
2678 | NL_SET_ERR_MSG(extack, | |
2679 | "Invalid gateway address"); | |
1da177e4 | 2680 | goto out; |
d5d531cb | 2681 | } |
1da177e4 | 2682 | |
a435a07f | 2683 | if (cfg->fc_table) { |
8c14586f DA |
2684 | grt = ip6_nh_lookup_table(net, cfg, gw_addr); |
2685 | ||
a435a07f VB |
2686 | if (grt) { |
2687 | if (grt->rt6i_flags & RTF_GATEWAY || | |
2688 | (dev && dev != grt->dst.dev)) { | |
2689 | ip6_rt_put(grt); | |
2690 | grt = NULL; | |
2691 | } | |
2692 | } | |
2693 | } | |
2694 | ||
8c14586f DA |
2695 | if (!grt) |
2696 | grt = rt6_lookup(net, gw_addr, NULL, | |
2697 | cfg->fc_ifindex, 1); | |
1da177e4 LT |
2698 | |
2699 | err = -EHOSTUNREACH; | |
38308473 | 2700 | if (!grt) |
1da177e4 LT |
2701 | goto out; |
2702 | if (dev) { | |
d1918542 | 2703 | if (dev != grt->dst.dev) { |
94e187c0 | 2704 | ip6_rt_put(grt); |
1da177e4 LT |
2705 | goto out; |
2706 | } | |
2707 | } else { | |
d1918542 | 2708 | dev = grt->dst.dev; |
1da177e4 LT |
2709 | idev = grt->rt6i_idev; |
2710 | dev_hold(dev); | |
2711 | in6_dev_hold(grt->rt6i_idev); | |
2712 | } | |
38308473 | 2713 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 2714 | err = 0; |
94e187c0 | 2715 | ip6_rt_put(grt); |
1da177e4 LT |
2716 | |
2717 | if (err) | |
2718 | goto out; | |
2719 | } | |
2720 | err = -EINVAL; | |
d5d531cb DA |
2721 | if (!dev) { |
2722 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
2723 | goto out; | |
2724 | } else if (dev->flags & IFF_LOOPBACK) { | |
2725 | NL_SET_ERR_MSG(extack, | |
2726 | "Egress device can not be loopback device for this route"); | |
1da177e4 | 2727 | goto out; |
d5d531cb | 2728 | } |
1da177e4 LT |
2729 | } |
2730 | ||
2731 | err = -ENODEV; | |
38308473 | 2732 | if (!dev) |
1da177e4 LT |
2733 | goto out; |
2734 | ||
c3968a85 DW |
2735 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
2736 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
d5d531cb | 2737 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
2738 | err = -EINVAL; |
2739 | goto out; | |
2740 | } | |
4e3fd7a0 | 2741 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
2742 | rt->rt6i_prefsrc.plen = 128; |
2743 | } else | |
2744 | rt->rt6i_prefsrc.plen = 0; | |
2745 | ||
86872cb5 | 2746 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
2747 | |
2748 | install_route: | |
d8d1f30b | 2749 | rt->dst.dev = dev; |
1da177e4 | 2750 | rt->rt6i_idev = idev; |
c71099ac | 2751 | rt->rt6i_table = table; |
63152fc0 | 2752 | |
c346dca1 | 2753 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 2754 | |
8c5b83f0 | 2755 | return rt; |
6b9ea5a6 RP |
2756 | out: |
2757 | if (dev) | |
2758 | dev_put(dev); | |
2759 | if (idev) | |
2760 | in6_dev_put(idev); | |
587fea74 WW |
2761 | if (rt) |
2762 | dst_release_immediate(&rt->dst); | |
6b9ea5a6 | 2763 | |
8c5b83f0 | 2764 | return ERR_PTR(err); |
6b9ea5a6 RP |
2765 | } |
2766 | ||
333c4301 DA |
2767 | int ip6_route_add(struct fib6_config *cfg, |
2768 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
2769 | { |
2770 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 2771 | struct rt6_info *rt; |
6b9ea5a6 RP |
2772 | int err; |
2773 | ||
333c4301 | 2774 | rt = ip6_route_info_create(cfg, extack); |
8c5b83f0 RP |
2775 | if (IS_ERR(rt)) { |
2776 | err = PTR_ERR(rt); | |
2777 | rt = NULL; | |
6b9ea5a6 | 2778 | goto out; |
8c5b83f0 | 2779 | } |
6b9ea5a6 | 2780 | |
e715b6d3 FW |
2781 | err = ip6_convert_metrics(&mxc, cfg); |
2782 | if (err) | |
2783 | goto out; | |
1da177e4 | 2784 | |
333c4301 | 2785 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc, extack); |
e715b6d3 FW |
2786 | |
2787 | kfree(mxc.mx); | |
6b9ea5a6 | 2788 | |
e715b6d3 | 2789 | return err; |
1da177e4 | 2790 | out: |
587fea74 WW |
2791 | if (rt) |
2792 | dst_release_immediate(&rt->dst); | |
6b9ea5a6 | 2793 | |
1da177e4 LT |
2794 | return err; |
2795 | } | |
2796 | ||
86872cb5 | 2797 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2798 | { |
2799 | int err; | |
c71099ac | 2800 | struct fib6_table *table; |
d1918542 | 2801 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2802 | |
a4c2fd7f | 2803 | if (rt == net->ipv6.ip6_null_entry) { |
6825a26c G |
2804 | err = -ENOENT; |
2805 | goto out; | |
2806 | } | |
6c813a72 | 2807 | |
c71099ac | 2808 | table = rt->rt6i_table; |
66f5d6ce | 2809 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 2810 | err = fib6_del(rt, info); |
66f5d6ce | 2811 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 2812 | |
6825a26c | 2813 | out: |
94e187c0 | 2814 | ip6_rt_put(rt); |
1da177e4 LT |
2815 | return err; |
2816 | } | |
2817 | ||
e0a1ad73 TG |
2818 | int ip6_del_rt(struct rt6_info *rt) |
2819 | { | |
4d1169c1 | 2820 | struct nl_info info = { |
d1918542 | 2821 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2822 | }; |
528c4ceb | 2823 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2824 | } |
2825 | ||
0ae81335 DA |
2826 | static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg) |
2827 | { | |
2828 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 2829 | struct net *net = info->nl_net; |
16a16cd3 | 2830 | struct sk_buff *skb = NULL; |
0ae81335 | 2831 | struct fib6_table *table; |
e3330039 | 2832 | int err = -ENOENT; |
0ae81335 | 2833 | |
e3330039 WC |
2834 | if (rt == net->ipv6.ip6_null_entry) |
2835 | goto out_put; | |
0ae81335 | 2836 | table = rt->rt6i_table; |
66f5d6ce | 2837 | spin_lock_bh(&table->tb6_lock); |
0ae81335 DA |
2838 | |
2839 | if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) { | |
2840 | struct rt6_info *sibling, *next_sibling; | |
2841 | ||
16a16cd3 DA |
2842 | /* prefer to send a single notification with all hops */ |
2843 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
2844 | if (skb) { | |
2845 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
2846 | ||
e3330039 | 2847 | if (rt6_fill_node(net, skb, rt, |
16a16cd3 DA |
2848 | NULL, NULL, 0, RTM_DELROUTE, |
2849 | info->portid, seq, 0) < 0) { | |
2850 | kfree_skb(skb); | |
2851 | skb = NULL; | |
2852 | } else | |
2853 | info->skip_notify = 1; | |
2854 | } | |
2855 | ||
0ae81335 DA |
2856 | list_for_each_entry_safe(sibling, next_sibling, |
2857 | &rt->rt6i_siblings, | |
2858 | rt6i_siblings) { | |
2859 | err = fib6_del(sibling, info); | |
2860 | if (err) | |
e3330039 | 2861 | goto out_unlock; |
0ae81335 DA |
2862 | } |
2863 | } | |
2864 | ||
2865 | err = fib6_del(rt, info); | |
e3330039 | 2866 | out_unlock: |
66f5d6ce | 2867 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 2868 | out_put: |
0ae81335 | 2869 | ip6_rt_put(rt); |
16a16cd3 DA |
2870 | |
2871 | if (skb) { | |
e3330039 | 2872 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
2873 | info->nlh, gfp_any()); |
2874 | } | |
0ae81335 DA |
2875 | return err; |
2876 | } | |
2877 | ||
333c4301 DA |
2878 | static int ip6_route_del(struct fib6_config *cfg, |
2879 | struct netlink_ext_ack *extack) | |
1da177e4 | 2880 | { |
2b760fcf | 2881 | struct rt6_info *rt, *rt_cache; |
c71099ac | 2882 | struct fib6_table *table; |
1da177e4 | 2883 | struct fib6_node *fn; |
1da177e4 LT |
2884 | int err = -ESRCH; |
2885 | ||
5578689a | 2886 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
2887 | if (!table) { |
2888 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 2889 | return err; |
d5d531cb | 2890 | } |
c71099ac | 2891 | |
66f5d6ce | 2892 | rcu_read_lock(); |
1da177e4 | 2893 | |
c71099ac | 2894 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 2895 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 2896 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 2897 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 2898 | |
1da177e4 | 2899 | if (fn) { |
66f5d6ce | 2900 | for_each_fib6_node_rt_rcu(fn) { |
2b760fcf WW |
2901 | if (cfg->fc_flags & RTF_CACHE) { |
2902 | rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst, | |
2903 | &cfg->fc_src); | |
2904 | if (!rt_cache) | |
2905 | continue; | |
2906 | rt = rt_cache; | |
2907 | } | |
86872cb5 | 2908 | if (cfg->fc_ifindex && |
d1918542 DM |
2909 | (!rt->dst.dev || |
2910 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2911 | continue; |
86872cb5 TG |
2912 | if (cfg->fc_flags & RTF_GATEWAY && |
2913 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2914 | continue; |
86872cb5 | 2915 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2916 | continue; |
c2ed1880 M |
2917 | if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol) |
2918 | continue; | |
d3843fe5 WW |
2919 | if (!dst_hold_safe(&rt->dst)) |
2920 | break; | |
66f5d6ce | 2921 | rcu_read_unlock(); |
1da177e4 | 2922 | |
0ae81335 DA |
2923 | /* if gateway was specified only delete the one hop */ |
2924 | if (cfg->fc_flags & RTF_GATEWAY) | |
2925 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
2926 | ||
2927 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
2928 | } |
2929 | } | |
66f5d6ce | 2930 | rcu_read_unlock(); |
1da177e4 LT |
2931 | |
2932 | return err; | |
2933 | } | |
2934 | ||
6700c270 | 2935 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2936 | { |
a6279458 | 2937 | struct netevent_redirect netevent; |
e8599ff4 | 2938 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2939 | struct ndisc_options ndopts; |
2940 | struct inet6_dev *in6_dev; | |
2941 | struct neighbour *neigh; | |
71bcdba0 | 2942 | struct rd_msg *msg; |
6e157b6a DM |
2943 | int optlen, on_link; |
2944 | u8 *lladdr; | |
e8599ff4 | 2945 | |
29a3cad5 | 2946 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2947 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2948 | |
2949 | if (optlen < 0) { | |
6e157b6a | 2950 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2951 | return; |
2952 | } | |
2953 | ||
71bcdba0 | 2954 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2955 | |
71bcdba0 | 2956 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2957 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2958 | return; |
2959 | } | |
2960 | ||
6e157b6a | 2961 | on_link = 0; |
71bcdba0 | 2962 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2963 | on_link = 1; |
71bcdba0 | 2964 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2965 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2966 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2967 | return; |
2968 | } | |
2969 | ||
2970 | in6_dev = __in6_dev_get(skb->dev); | |
2971 | if (!in6_dev) | |
2972 | return; | |
2973 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2974 | return; | |
2975 | ||
2976 | /* RFC2461 8.1: | |
2977 | * The IP source address of the Redirect MUST be the same as the current | |
2978 | * first-hop router for the specified ICMP Destination Address. | |
2979 | */ | |
2980 | ||
f997c55c | 2981 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2982 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2983 | return; | |
2984 | } | |
6e157b6a DM |
2985 | |
2986 | lladdr = NULL; | |
e8599ff4 DM |
2987 | if (ndopts.nd_opts_tgt_lladdr) { |
2988 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2989 | skb->dev); | |
2990 | if (!lladdr) { | |
2991 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2992 | return; | |
2993 | } | |
2994 | } | |
2995 | ||
6e157b6a | 2996 | rt = (struct rt6_info *) dst; |
ec13ad1d | 2997 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 2998 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 2999 | return; |
6e157b6a | 3000 | } |
e8599ff4 | 3001 | |
6e157b6a DM |
3002 | /* Redirect received -> path was valid. |
3003 | * Look, redirects are sent only in response to data packets, | |
3004 | * so that this nexthop apparently is reachable. --ANK | |
3005 | */ | |
0dec879f | 3006 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 3007 | |
71bcdba0 | 3008 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
3009 | if (!neigh) |
3010 | return; | |
a6279458 | 3011 | |
1da177e4 LT |
3012 | /* |
3013 | * We have finally decided to accept it. | |
3014 | */ | |
3015 | ||
f997c55c | 3016 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
3017 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
3018 | NEIGH_UPDATE_F_OVERRIDE| | |
3019 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
3020 | NEIGH_UPDATE_F_ISROUTER)), |
3021 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 3022 | |
83a09abd | 3023 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 3024 | if (!nrt) |
1da177e4 LT |
3025 | goto out; |
3026 | ||
3027 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
3028 | if (on_link) | |
3029 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
3030 | ||
b91d5329 | 3031 | nrt->rt6i_protocol = RTPROT_REDIRECT; |
4e3fd7a0 | 3032 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 3033 | |
2b760fcf WW |
3034 | /* No need to remove rt from the exception table if rt is |
3035 | * a cached route because rt6_insert_exception() will | |
3036 | * takes care of it | |
3037 | */ | |
3038 | if (rt6_insert_exception(nrt, rt)) { | |
3039 | dst_release_immediate(&nrt->dst); | |
3040 | goto out; | |
3041 | } | |
1da177e4 | 3042 | |
d8d1f30b CG |
3043 | netevent.old = &rt->dst; |
3044 | netevent.new = &nrt->dst; | |
71bcdba0 | 3045 | netevent.daddr = &msg->dest; |
60592833 | 3046 | netevent.neigh = neigh; |
8d71740c TT |
3047 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
3048 | ||
1da177e4 | 3049 | out: |
e8599ff4 | 3050 | neigh_release(neigh); |
6e157b6a DM |
3051 | } |
3052 | ||
1da177e4 LT |
3053 | /* |
3054 | * Misc support functions | |
3055 | */ | |
3056 | ||
4b32b5ad MKL |
3057 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
3058 | { | |
3059 | BUG_ON(from->dst.from); | |
3060 | ||
3061 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
3062 | dst_hold(&from->dst); | |
3063 | rt->dst.from = &from->dst; | |
3064 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
3065 | } | |
3066 | ||
83a09abd MKL |
3067 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
3068 | { | |
3069 | rt->dst.input = ort->dst.input; | |
3070 | rt->dst.output = ort->dst.output; | |
3071 | rt->rt6i_dst = ort->rt6i_dst; | |
3072 | rt->dst.error = ort->dst.error; | |
3073 | rt->rt6i_idev = ort->rt6i_idev; | |
3074 | if (rt->rt6i_idev) | |
3075 | in6_dev_hold(rt->rt6i_idev); | |
3076 | rt->dst.lastuse = jiffies; | |
3077 | rt->rt6i_gateway = ort->rt6i_gateway; | |
3078 | rt->rt6i_flags = ort->rt6i_flags; | |
3079 | rt6_set_from(rt, ort); | |
3080 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 3081 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 3082 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 3083 | #endif |
83a09abd MKL |
3084 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
3085 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 3086 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
3087 | } |
3088 | ||
70ceb4f5 | 3089 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 3090 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 3091 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
3092 | const struct in6_addr *gwaddr, |
3093 | struct net_device *dev) | |
70ceb4f5 | 3094 | { |
830218c1 DA |
3095 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
3096 | int ifindex = dev->ifindex; | |
70ceb4f5 YH |
3097 | struct fib6_node *fn; |
3098 | struct rt6_info *rt = NULL; | |
c71099ac TG |
3099 | struct fib6_table *table; |
3100 | ||
830218c1 | 3101 | table = fib6_get_table(net, tb_id); |
38308473 | 3102 | if (!table) |
c71099ac | 3103 | return NULL; |
70ceb4f5 | 3104 | |
66f5d6ce | 3105 | rcu_read_lock(); |
38fbeeee | 3106 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
3107 | if (!fn) |
3108 | goto out; | |
3109 | ||
66f5d6ce | 3110 | for_each_fib6_node_rt_rcu(fn) { |
d1918542 | 3111 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
3112 | continue; |
3113 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
3114 | continue; | |
3115 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
3116 | continue; | |
d3843fe5 | 3117 | ip6_hold_safe(NULL, &rt, false); |
70ceb4f5 YH |
3118 | break; |
3119 | } | |
3120 | out: | |
66f5d6ce | 3121 | rcu_read_unlock(); |
70ceb4f5 YH |
3122 | return rt; |
3123 | } | |
3124 | ||
efa2cea0 | 3125 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 3126 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
3127 | const struct in6_addr *gwaddr, |
3128 | struct net_device *dev, | |
95c96174 | 3129 | unsigned int pref) |
70ceb4f5 | 3130 | { |
86872cb5 | 3131 | struct fib6_config cfg = { |
238fc7ea | 3132 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 3133 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
3134 | .fc_dst_len = prefixlen, |
3135 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
3136 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 3137 | .fc_protocol = RTPROT_RA, |
15e47304 | 3138 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
3139 | .fc_nlinfo.nlh = NULL, |
3140 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
3141 | }; |
3142 | ||
830218c1 | 3143 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
3144 | cfg.fc_dst = *prefix; |
3145 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 3146 | |
e317da96 YH |
3147 | /* We should treat it as a default route if prefix length is 0. */ |
3148 | if (!prefixlen) | |
86872cb5 | 3149 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 3150 | |
333c4301 | 3151 | ip6_route_add(&cfg, NULL); |
70ceb4f5 | 3152 | |
830218c1 | 3153 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
3154 | } |
3155 | #endif | |
3156 | ||
b71d1d42 | 3157 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 3158 | { |
830218c1 | 3159 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
1da177e4 | 3160 | struct rt6_info *rt; |
c71099ac | 3161 | struct fib6_table *table; |
1da177e4 | 3162 | |
830218c1 | 3163 | table = fib6_get_table(dev_net(dev), tb_id); |
38308473 | 3164 | if (!table) |
c71099ac | 3165 | return NULL; |
1da177e4 | 3166 | |
66f5d6ce WW |
3167 | rcu_read_lock(); |
3168 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
d1918542 | 3169 | if (dev == rt->dst.dev && |
045927ff | 3170 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
3171 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
3172 | break; | |
3173 | } | |
3174 | if (rt) | |
d3843fe5 | 3175 | ip6_hold_safe(NULL, &rt, false); |
66f5d6ce | 3176 | rcu_read_unlock(); |
1da177e4 LT |
3177 | return rt; |
3178 | } | |
3179 | ||
b71d1d42 | 3180 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
3181 | struct net_device *dev, |
3182 | unsigned int pref) | |
1da177e4 | 3183 | { |
86872cb5 | 3184 | struct fib6_config cfg = { |
ca254490 | 3185 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 3186 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
3187 | .fc_ifindex = dev->ifindex, |
3188 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
3189 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 3190 | .fc_protocol = RTPROT_RA, |
15e47304 | 3191 | .fc_nlinfo.portid = 0, |
5578689a | 3192 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 3193 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 3194 | }; |
1da177e4 | 3195 | |
4e3fd7a0 | 3196 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 3197 | |
333c4301 | 3198 | if (!ip6_route_add(&cfg, NULL)) { |
830218c1 DA |
3199 | struct fib6_table *table; |
3200 | ||
3201 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
3202 | if (table) | |
3203 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
3204 | } | |
1da177e4 | 3205 | |
1da177e4 LT |
3206 | return rt6_get_dflt_router(gwaddr, dev); |
3207 | } | |
3208 | ||
830218c1 | 3209 | static void __rt6_purge_dflt_routers(struct fib6_table *table) |
1da177e4 LT |
3210 | { |
3211 | struct rt6_info *rt; | |
3212 | ||
3213 | restart: | |
66f5d6ce WW |
3214 | rcu_read_lock(); |
3215 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
3e8b0ac3 LC |
3216 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
3217 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d3843fe5 | 3218 | if (dst_hold_safe(&rt->dst)) { |
66f5d6ce | 3219 | rcu_read_unlock(); |
d3843fe5 WW |
3220 | ip6_del_rt(rt); |
3221 | } else { | |
66f5d6ce | 3222 | rcu_read_unlock(); |
d3843fe5 | 3223 | } |
1da177e4 LT |
3224 | goto restart; |
3225 | } | |
3226 | } | |
66f5d6ce | 3227 | rcu_read_unlock(); |
830218c1 DA |
3228 | |
3229 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
3230 | } | |
3231 | ||
3232 | void rt6_purge_dflt_routers(struct net *net) | |
3233 | { | |
3234 | struct fib6_table *table; | |
3235 | struct hlist_head *head; | |
3236 | unsigned int h; | |
3237 | ||
3238 | rcu_read_lock(); | |
3239 | ||
3240 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
3241 | head = &net->ipv6.fib_table_hash[h]; | |
3242 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
3243 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
3244 | __rt6_purge_dflt_routers(table); | |
3245 | } | |
3246 | } | |
3247 | ||
3248 | rcu_read_unlock(); | |
1da177e4 LT |
3249 | } |
3250 | ||
5578689a DL |
3251 | static void rtmsg_to_fib6_config(struct net *net, |
3252 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
3253 | struct fib6_config *cfg) |
3254 | { | |
3255 | memset(cfg, 0, sizeof(*cfg)); | |
3256 | ||
ca254490 DA |
3257 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
3258 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
3259 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
3260 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
3261 | cfg->fc_expires = rtmsg->rtmsg_info; | |
3262 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
3263 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
3264 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
3265 | ||
5578689a | 3266 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 3267 | |
4e3fd7a0 AD |
3268 | cfg->fc_dst = rtmsg->rtmsg_dst; |
3269 | cfg->fc_src = rtmsg->rtmsg_src; | |
3270 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
3271 | } |
3272 | ||
5578689a | 3273 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 3274 | { |
86872cb5 | 3275 | struct fib6_config cfg; |
1da177e4 LT |
3276 | struct in6_rtmsg rtmsg; |
3277 | int err; | |
3278 | ||
67ba4152 | 3279 | switch (cmd) { |
1da177e4 LT |
3280 | case SIOCADDRT: /* Add a route */ |
3281 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 3282 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
3283 | return -EPERM; |
3284 | err = copy_from_user(&rtmsg, arg, | |
3285 | sizeof(struct in6_rtmsg)); | |
3286 | if (err) | |
3287 | return -EFAULT; | |
86872cb5 | 3288 | |
5578689a | 3289 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 3290 | |
1da177e4 LT |
3291 | rtnl_lock(); |
3292 | switch (cmd) { | |
3293 | case SIOCADDRT: | |
333c4301 | 3294 | err = ip6_route_add(&cfg, NULL); |
1da177e4 LT |
3295 | break; |
3296 | case SIOCDELRT: | |
333c4301 | 3297 | err = ip6_route_del(&cfg, NULL); |
1da177e4 LT |
3298 | break; |
3299 | default: | |
3300 | err = -EINVAL; | |
3301 | } | |
3302 | rtnl_unlock(); | |
3303 | ||
3304 | return err; | |
3ff50b79 | 3305 | } |
1da177e4 LT |
3306 | |
3307 | return -EINVAL; | |
3308 | } | |
3309 | ||
3310 | /* | |
3311 | * Drop the packet on the floor | |
3312 | */ | |
3313 | ||
d5fdd6ba | 3314 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 3315 | { |
612f09e8 | 3316 | int type; |
adf30907 | 3317 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
3318 | switch (ipstats_mib_noroutes) { |
3319 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 3320 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 3321 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
3322 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
3323 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
3324 | break; |
3325 | } | |
3326 | /* FALLTHROUGH */ | |
3327 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
3328 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
3329 | ipstats_mib_noroutes); | |
612f09e8 YH |
3330 | break; |
3331 | } | |
3ffe533c | 3332 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
3333 | kfree_skb(skb); |
3334 | return 0; | |
3335 | } | |
3336 | ||
9ce8ade0 TG |
3337 | static int ip6_pkt_discard(struct sk_buff *skb) |
3338 | { | |
612f09e8 | 3339 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
3340 | } |
3341 | ||
ede2059d | 3342 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 3343 | { |
adf30907 | 3344 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 3345 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
3346 | } |
3347 | ||
9ce8ade0 TG |
3348 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
3349 | { | |
612f09e8 | 3350 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
3351 | } |
3352 | ||
ede2059d | 3353 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 3354 | { |
adf30907 | 3355 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 3356 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
3357 | } |
3358 | ||
1da177e4 LT |
3359 | /* |
3360 | * Allocate a dst for local (unicast / anycast) address. | |
3361 | */ | |
3362 | ||
3363 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
3364 | const struct in6_addr *addr, | |
8f031519 | 3365 | bool anycast) |
1da177e4 | 3366 | { |
ca254490 | 3367 | u32 tb_id; |
c346dca1 | 3368 | struct net *net = dev_net(idev->dev); |
4832c30d | 3369 | struct net_device *dev = idev->dev; |
5f02ce24 DA |
3370 | struct rt6_info *rt; |
3371 | ||
5f02ce24 | 3372 | rt = ip6_dst_alloc(net, dev, DST_NOCOUNT); |
a3300ef4 | 3373 | if (!rt) |
1da177e4 LT |
3374 | return ERR_PTR(-ENOMEM); |
3375 | ||
1da177e4 LT |
3376 | in6_dev_hold(idev); |
3377 | ||
11d53b49 | 3378 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
3379 | rt->dst.input = ip6_input; |
3380 | rt->dst.output = ip6_output; | |
1da177e4 | 3381 | rt->rt6i_idev = idev; |
1da177e4 | 3382 | |
94b5e0f9 | 3383 | rt->rt6i_protocol = RTPROT_KERNEL; |
1da177e4 | 3384 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
58c4fb86 YH |
3385 | if (anycast) |
3386 | rt->rt6i_flags |= RTF_ANYCAST; | |
3387 | else | |
1da177e4 | 3388 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 3389 | |
550bab42 | 3390 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 3391 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 3392 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
3393 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
3394 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
1da177e4 | 3395 | |
1da177e4 LT |
3396 | return rt; |
3397 | } | |
3398 | ||
c3968a85 DW |
3399 | /* remove deleted ip from prefsrc entries */ |
3400 | struct arg_dev_net_ip { | |
3401 | struct net_device *dev; | |
3402 | struct net *net; | |
3403 | struct in6_addr *addr; | |
3404 | }; | |
3405 | ||
3406 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
3407 | { | |
3408 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
3409 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
3410 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
3411 | ||
d1918542 | 3412 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
3413 | rt != net->ipv6.ip6_null_entry && |
3414 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
60006a48 | 3415 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 DW |
3416 | /* remove prefsrc entry */ |
3417 | rt->rt6i_prefsrc.plen = 0; | |
60006a48 WW |
3418 | /* need to update cache as well */ |
3419 | rt6_exceptions_remove_prefsrc(rt); | |
3420 | spin_unlock_bh(&rt6_exception_lock); | |
c3968a85 DW |
3421 | } |
3422 | return 0; | |
3423 | } | |
3424 | ||
3425 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
3426 | { | |
3427 | struct net *net = dev_net(ifp->idev->dev); | |
3428 | struct arg_dev_net_ip adni = { | |
3429 | .dev = ifp->idev->dev, | |
3430 | .net = net, | |
3431 | .addr = &ifp->addr, | |
3432 | }; | |
0c3584d5 | 3433 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
3434 | } |
3435 | ||
be7a010d | 3436 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
be7a010d DJ |
3437 | |
3438 | /* Remove routers and update dst entries when gateway turn into host. */ | |
3439 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
3440 | { | |
3441 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
3442 | ||
2b760fcf WW |
3443 | if (((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
3444 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
be7a010d DJ |
3445 | return -1; |
3446 | } | |
b16cb459 WW |
3447 | |
3448 | /* Further clean up cached routes in exception table. | |
3449 | * This is needed because cached route may have a different | |
3450 | * gateway than its 'parent' in the case of an ip redirect. | |
3451 | */ | |
3452 | rt6_exceptions_clean_tohost(rt, gateway); | |
3453 | ||
be7a010d DJ |
3454 | return 0; |
3455 | } | |
3456 | ||
3457 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
3458 | { | |
3459 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
3460 | } | |
3461 | ||
8ed67789 DL |
3462 | struct arg_dev_net { |
3463 | struct net_device *dev; | |
3464 | struct net *net; | |
3465 | }; | |
3466 | ||
a1a22c12 | 3467 | /* called with write lock held for table with rt */ |
1da177e4 LT |
3468 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
3469 | { | |
bc3ef660 | 3470 | const struct arg_dev_net *adn = arg; |
3471 | const struct net_device *dev = adn->dev; | |
8ed67789 | 3472 | |
d1918542 | 3473 | if ((rt->dst.dev == dev || !dev) && |
a1a22c12 DA |
3474 | rt != adn->net->ipv6.ip6_null_entry && |
3475 | (rt->rt6i_nsiblings == 0 || | |
8397ed36 | 3476 | (dev && netdev_unregistering(dev)) || |
a1a22c12 | 3477 | !rt->rt6i_idev->cnf.ignore_routes_with_linkdown)) |
1da177e4 | 3478 | return -1; |
c159d30c | 3479 | |
1da177e4 LT |
3480 | return 0; |
3481 | } | |
3482 | ||
f3db4851 | 3483 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 3484 | { |
8ed67789 DL |
3485 | struct arg_dev_net adn = { |
3486 | .dev = dev, | |
3487 | .net = net, | |
3488 | }; | |
3489 | ||
0c3584d5 | 3490 | fib6_clean_all(net, fib6_ifdown, &adn); |
e332bc67 EB |
3491 | if (dev) |
3492 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
3493 | } |
3494 | ||
95c96174 | 3495 | struct rt6_mtu_change_arg { |
1da177e4 | 3496 | struct net_device *dev; |
95c96174 | 3497 | unsigned int mtu; |
1da177e4 LT |
3498 | }; |
3499 | ||
3500 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
3501 | { | |
3502 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
3503 | struct inet6_dev *idev; | |
3504 | ||
3505 | /* In IPv6 pmtu discovery is not optional, | |
3506 | so that RTAX_MTU lock cannot disable it. | |
3507 | We still use this lock to block changes | |
3508 | caused by addrconf/ndisc. | |
3509 | */ | |
3510 | ||
3511 | idev = __in6_dev_get(arg->dev); | |
38308473 | 3512 | if (!idev) |
1da177e4 LT |
3513 | return 0; |
3514 | ||
3515 | /* For administrative MTU increase, there is no way to discover | |
3516 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
3517 | Since RFC 1981 doesn't include administrative MTU increase | |
3518 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
3519 | */ | |
3520 | /* | |
3521 | If new MTU is less than route PMTU, this new MTU will be the | |
3522 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
3523 | decreases; if new MTU is greater than route PMTU, and the | |
3524 | old MTU is the lowest MTU in the path, update the route PMTU | |
3525 | to reflect the increase. In this case if the other nodes' MTU | |
3526 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
67c408cf | 3527 | PMTU discovery. |
1da177e4 | 3528 | */ |
d1918542 | 3529 | if (rt->dst.dev == arg->dev && |
fb56be83 | 3530 | dst_metric_raw(&rt->dst, RTAX_MTU) && |
4b32b5ad | 3531 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
f5bbe7ee | 3532 | spin_lock_bh(&rt6_exception_lock); |
2b760fcf WW |
3533 | if (dst_mtu(&rt->dst) >= arg->mtu || |
3534 | (dst_mtu(&rt->dst) < arg->mtu && | |
3535 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
4b32b5ad MKL |
3536 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
3537 | } | |
f5bbe7ee WW |
3538 | rt6_exceptions_update_pmtu(rt, arg->mtu); |
3539 | spin_unlock_bh(&rt6_exception_lock); | |
566cfd8f | 3540 | } |
1da177e4 LT |
3541 | return 0; |
3542 | } | |
3543 | ||
95c96174 | 3544 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 3545 | { |
c71099ac TG |
3546 | struct rt6_mtu_change_arg arg = { |
3547 | .dev = dev, | |
3548 | .mtu = mtu, | |
3549 | }; | |
1da177e4 | 3550 | |
0c3584d5 | 3551 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
3552 | } |
3553 | ||
ef7c79ed | 3554 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 3555 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 3556 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 3557 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
3558 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
3559 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 3560 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 3561 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
3562 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
3563 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 3564 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 3565 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 3566 | [RTA_MARK] = { .type = NLA_U32 }, |
86872cb5 TG |
3567 | }; |
3568 | ||
3569 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
3570 | struct fib6_config *cfg, |
3571 | struct netlink_ext_ack *extack) | |
1da177e4 | 3572 | { |
86872cb5 TG |
3573 | struct rtmsg *rtm; |
3574 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 3575 | unsigned int pref; |
86872cb5 | 3576 | int err; |
1da177e4 | 3577 | |
fceb6435 JB |
3578 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
3579 | NULL); | |
86872cb5 TG |
3580 | if (err < 0) |
3581 | goto errout; | |
1da177e4 | 3582 | |
86872cb5 TG |
3583 | err = -EINVAL; |
3584 | rtm = nlmsg_data(nlh); | |
3585 | memset(cfg, 0, sizeof(*cfg)); | |
3586 | ||
3587 | cfg->fc_table = rtm->rtm_table; | |
3588 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
3589 | cfg->fc_src_len = rtm->rtm_src_len; | |
3590 | cfg->fc_flags = RTF_UP; | |
3591 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 3592 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 3593 | |
ef2c7d7b ND |
3594 | if (rtm->rtm_type == RTN_UNREACHABLE || |
3595 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
3596 | rtm->rtm_type == RTN_PROHIBIT || |
3597 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
3598 | cfg->fc_flags |= RTF_REJECT; |
3599 | ||
ab79ad14 MŻ |
3600 | if (rtm->rtm_type == RTN_LOCAL) |
3601 | cfg->fc_flags |= RTF_LOCAL; | |
3602 | ||
1f56a01f MKL |
3603 | if (rtm->rtm_flags & RTM_F_CLONED) |
3604 | cfg->fc_flags |= RTF_CACHE; | |
3605 | ||
15e47304 | 3606 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 3607 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 3608 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
3609 | |
3610 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 3611 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 3612 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 3613 | } |
86872cb5 TG |
3614 | |
3615 | if (tb[RTA_DST]) { | |
3616 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
3617 | ||
3618 | if (nla_len(tb[RTA_DST]) < plen) | |
3619 | goto errout; | |
3620 | ||
3621 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 3622 | } |
86872cb5 TG |
3623 | |
3624 | if (tb[RTA_SRC]) { | |
3625 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
3626 | ||
3627 | if (nla_len(tb[RTA_SRC]) < plen) | |
3628 | goto errout; | |
3629 | ||
3630 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 3631 | } |
86872cb5 | 3632 | |
c3968a85 | 3633 | if (tb[RTA_PREFSRC]) |
67b61f6c | 3634 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 3635 | |
86872cb5 TG |
3636 | if (tb[RTA_OIF]) |
3637 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
3638 | ||
3639 | if (tb[RTA_PRIORITY]) | |
3640 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
3641 | ||
3642 | if (tb[RTA_METRICS]) { | |
3643 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
3644 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 3645 | } |
86872cb5 TG |
3646 | |
3647 | if (tb[RTA_TABLE]) | |
3648 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
3649 | ||
51ebd318 ND |
3650 | if (tb[RTA_MULTIPATH]) { |
3651 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
3652 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
3653 | |
3654 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 3655 | cfg->fc_mp_len, extack); |
9ed59592 DA |
3656 | if (err < 0) |
3657 | goto errout; | |
51ebd318 ND |
3658 | } |
3659 | ||
c78ba6d6 LR |
3660 | if (tb[RTA_PREF]) { |
3661 | pref = nla_get_u8(tb[RTA_PREF]); | |
3662 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
3663 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
3664 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
3665 | cfg->fc_flags |= RTF_PREF(pref); | |
3666 | } | |
3667 | ||
19e42e45 RP |
3668 | if (tb[RTA_ENCAP]) |
3669 | cfg->fc_encap = tb[RTA_ENCAP]; | |
3670 | ||
9ed59592 | 3671 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
3672 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
3673 | ||
c255bd68 | 3674 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
3675 | if (err < 0) |
3676 | goto errout; | |
3677 | } | |
3678 | ||
32bc201e XL |
3679 | if (tb[RTA_EXPIRES]) { |
3680 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
3681 | ||
3682 | if (addrconf_finite_timeout(timeout)) { | |
3683 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
3684 | cfg->fc_flags |= RTF_EXPIRES; | |
3685 | } | |
3686 | } | |
3687 | ||
86872cb5 TG |
3688 | err = 0; |
3689 | errout: | |
3690 | return err; | |
1da177e4 LT |
3691 | } |
3692 | ||
6b9ea5a6 RP |
3693 | struct rt6_nh { |
3694 | struct rt6_info *rt6_info; | |
3695 | struct fib6_config r_cfg; | |
3696 | struct mx6_config mxc; | |
3697 | struct list_head next; | |
3698 | }; | |
3699 | ||
3700 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
3701 | { | |
3702 | struct rt6_nh *nh; | |
3703 | ||
3704 | list_for_each_entry(nh, rt6_nh_list, next) { | |
7d4d5065 | 3705 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n", |
6b9ea5a6 RP |
3706 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, |
3707 | nh->r_cfg.fc_ifindex); | |
3708 | } | |
3709 | } | |
3710 | ||
3711 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
3712 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
3713 | { | |
3714 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
3715 | int err = -EEXIST; |
3716 | ||
3717 | list_for_each_entry(nh, rt6_nh_list, next) { | |
3718 | /* check if rt6_info already exists */ | |
f06b7549 | 3719 | if (rt6_duplicate_nexthop(nh->rt6_info, rt)) |
6b9ea5a6 RP |
3720 | return err; |
3721 | } | |
3722 | ||
3723 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
3724 | if (!nh) | |
3725 | return -ENOMEM; | |
3726 | nh->rt6_info = rt; | |
3727 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
3728 | if (err) { | |
3729 | kfree(nh); | |
3730 | return err; | |
3731 | } | |
3732 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
3733 | list_add_tail(&nh->next, rt6_nh_list); | |
3734 | ||
3735 | return 0; | |
3736 | } | |
3737 | ||
3b1137fe DA |
3738 | static void ip6_route_mpath_notify(struct rt6_info *rt, |
3739 | struct rt6_info *rt_last, | |
3740 | struct nl_info *info, | |
3741 | __u16 nlflags) | |
3742 | { | |
3743 | /* if this is an APPEND route, then rt points to the first route | |
3744 | * inserted and rt_last points to last route inserted. Userspace | |
3745 | * wants a consistent dump of the route which starts at the first | |
3746 | * nexthop. Since sibling routes are always added at the end of | |
3747 | * the list, find the first sibling of the last route appended | |
3748 | */ | |
3749 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) { | |
3750 | rt = list_first_entry(&rt_last->rt6i_siblings, | |
3751 | struct rt6_info, | |
3752 | rt6i_siblings); | |
3753 | } | |
3754 | ||
3755 | if (rt) | |
3756 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
3757 | } | |
3758 | ||
333c4301 DA |
3759 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
3760 | struct netlink_ext_ack *extack) | |
51ebd318 | 3761 | { |
3b1137fe DA |
3762 | struct rt6_info *rt_notif = NULL, *rt_last = NULL; |
3763 | struct nl_info *info = &cfg->fc_nlinfo; | |
51ebd318 ND |
3764 | struct fib6_config r_cfg; |
3765 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
3766 | struct rt6_info *rt; |
3767 | struct rt6_nh *err_nh; | |
3768 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 3769 | __u16 nlflags; |
51ebd318 ND |
3770 | int remaining; |
3771 | int attrlen; | |
6b9ea5a6 RP |
3772 | int err = 1; |
3773 | int nhn = 0; | |
3774 | int replace = (cfg->fc_nlinfo.nlh && | |
3775 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
3776 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 3777 | |
3b1137fe DA |
3778 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
3779 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
3780 | nlflags |= NLM_F_APPEND; | |
3781 | ||
35f1b4e9 | 3782 | remaining = cfg->fc_mp_len; |
51ebd318 | 3783 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 3784 | |
6b9ea5a6 RP |
3785 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
3786 | * rt6_info structs per nexthop | |
3787 | */ | |
51ebd318 ND |
3788 | while (rtnh_ok(rtnh, remaining)) { |
3789 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3790 | if (rtnh->rtnh_ifindex) | |
3791 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3792 | ||
3793 | attrlen = rtnh_attrlen(rtnh); | |
3794 | if (attrlen > 0) { | |
3795 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3796 | ||
3797 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3798 | if (nla) { | |
67b61f6c | 3799 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
3800 | r_cfg.fc_flags |= RTF_GATEWAY; |
3801 | } | |
19e42e45 RP |
3802 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
3803 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
3804 | if (nla) | |
3805 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 3806 | } |
6b9ea5a6 | 3807 | |
333c4301 | 3808 | rt = ip6_route_info_create(&r_cfg, extack); |
8c5b83f0 RP |
3809 | if (IS_ERR(rt)) { |
3810 | err = PTR_ERR(rt); | |
3811 | rt = NULL; | |
6b9ea5a6 | 3812 | goto cleanup; |
8c5b83f0 | 3813 | } |
6b9ea5a6 RP |
3814 | |
3815 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 3816 | if (err) { |
587fea74 | 3817 | dst_release_immediate(&rt->dst); |
6b9ea5a6 RP |
3818 | goto cleanup; |
3819 | } | |
3820 | ||
3821 | rtnh = rtnh_next(rtnh, &remaining); | |
3822 | } | |
3823 | ||
3b1137fe DA |
3824 | /* for add and replace send one notification with all nexthops. |
3825 | * Skip the notification in fib6_add_rt2node and send one with | |
3826 | * the full route when done | |
3827 | */ | |
3828 | info->skip_notify = 1; | |
3829 | ||
6b9ea5a6 RP |
3830 | err_nh = NULL; |
3831 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3b1137fe | 3832 | rt_last = nh->rt6_info; |
333c4301 | 3833 | err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc, extack); |
3b1137fe DA |
3834 | /* save reference to first route for notification */ |
3835 | if (!rt_notif && !err) | |
3836 | rt_notif = nh->rt6_info; | |
3837 | ||
6b9ea5a6 RP |
3838 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ |
3839 | nh->rt6_info = NULL; | |
3840 | if (err) { | |
3841 | if (replace && nhn) | |
3842 | ip6_print_replace_route_err(&rt6_nh_list); | |
3843 | err_nh = nh; | |
3844 | goto add_errout; | |
51ebd318 | 3845 | } |
6b9ea5a6 | 3846 | |
1a72418b | 3847 | /* Because each route is added like a single route we remove |
27596472 MK |
3848 | * these flags after the first nexthop: if there is a collision, |
3849 | * we have already failed to add the first nexthop: | |
3850 | * fib6_add_rt2node() has rejected it; when replacing, old | |
3851 | * nexthops have been replaced by first new, the rest should | |
3852 | * be added to it. | |
1a72418b | 3853 | */ |
27596472 MK |
3854 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
3855 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
3856 | nhn++; |
3857 | } | |
3858 | ||
3b1137fe DA |
3859 | /* success ... tell user about new route */ |
3860 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
3861 | goto cleanup; |
3862 | ||
3863 | add_errout: | |
3b1137fe DA |
3864 | /* send notification for routes that were added so that |
3865 | * the delete notifications sent by ip6_route_del are | |
3866 | * coherent | |
3867 | */ | |
3868 | if (rt_notif) | |
3869 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
3870 | ||
6b9ea5a6 RP |
3871 | /* Delete routes that were already added */ |
3872 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3873 | if (err_nh == nh) | |
3874 | break; | |
333c4301 | 3875 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
3876 | } |
3877 | ||
3878 | cleanup: | |
3879 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
587fea74 WW |
3880 | if (nh->rt6_info) |
3881 | dst_release_immediate(&nh->rt6_info->dst); | |
52fe51f8 | 3882 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
3883 | list_del(&nh->next); |
3884 | kfree(nh); | |
3885 | } | |
3886 | ||
3887 | return err; | |
3888 | } | |
3889 | ||
333c4301 DA |
3890 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
3891 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
3892 | { |
3893 | struct fib6_config r_cfg; | |
3894 | struct rtnexthop *rtnh; | |
3895 | int remaining; | |
3896 | int attrlen; | |
3897 | int err = 1, last_err = 0; | |
3898 | ||
3899 | remaining = cfg->fc_mp_len; | |
3900 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
3901 | ||
3902 | /* Parse a Multipath Entry */ | |
3903 | while (rtnh_ok(rtnh, remaining)) { | |
3904 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3905 | if (rtnh->rtnh_ifindex) | |
3906 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3907 | ||
3908 | attrlen = rtnh_attrlen(rtnh); | |
3909 | if (attrlen > 0) { | |
3910 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3911 | ||
3912 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3913 | if (nla) { | |
3914 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
3915 | r_cfg.fc_flags |= RTF_GATEWAY; | |
3916 | } | |
3917 | } | |
333c4301 | 3918 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
3919 | if (err) |
3920 | last_err = err; | |
3921 | ||
51ebd318 ND |
3922 | rtnh = rtnh_next(rtnh, &remaining); |
3923 | } | |
3924 | ||
3925 | return last_err; | |
3926 | } | |
3927 | ||
c21ef3e3 DA |
3928 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
3929 | struct netlink_ext_ack *extack) | |
1da177e4 | 3930 | { |
86872cb5 TG |
3931 | struct fib6_config cfg; |
3932 | int err; | |
1da177e4 | 3933 | |
333c4301 | 3934 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
3935 | if (err < 0) |
3936 | return err; | |
3937 | ||
51ebd318 | 3938 | if (cfg.fc_mp) |
333c4301 | 3939 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
3940 | else { |
3941 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 3942 | return ip6_route_del(&cfg, extack); |
0ae81335 | 3943 | } |
1da177e4 LT |
3944 | } |
3945 | ||
c21ef3e3 DA |
3946 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
3947 | struct netlink_ext_ack *extack) | |
1da177e4 | 3948 | { |
86872cb5 TG |
3949 | struct fib6_config cfg; |
3950 | int err; | |
1da177e4 | 3951 | |
333c4301 | 3952 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
3953 | if (err < 0) |
3954 | return err; | |
3955 | ||
51ebd318 | 3956 | if (cfg.fc_mp) |
333c4301 | 3957 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 3958 | else |
333c4301 | 3959 | return ip6_route_add(&cfg, extack); |
1da177e4 LT |
3960 | } |
3961 | ||
beb1afac | 3962 | static size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f | 3963 | { |
beb1afac DA |
3964 | int nexthop_len = 0; |
3965 | ||
3966 | if (rt->rt6i_nsiblings) { | |
3967 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
3968 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
3969 | + nla_total_size(16) /* RTA_GATEWAY */ | |
beb1afac DA |
3970 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
3971 | ||
3972 | nexthop_len *= rt->rt6i_nsiblings; | |
3973 | } | |
3974 | ||
339bf98f TG |
3975 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
3976 | + nla_total_size(16) /* RTA_SRC */ | |
3977 | + nla_total_size(16) /* RTA_DST */ | |
3978 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3979 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3980 | + nla_total_size(4) /* RTA_TABLE */ | |
3981 | + nla_total_size(4) /* RTA_IIF */ | |
3982 | + nla_total_size(4) /* RTA_OIF */ | |
3983 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3984 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3985 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3986 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3987 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
3988 | + lwtunnel_get_encap_size(rt->dst.lwtstate) |
3989 | + nexthop_len; | |
3990 | } | |
3991 | ||
3992 | static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt, | |
5be083ce | 3993 | unsigned int *flags, bool skip_oif) |
beb1afac DA |
3994 | { |
3995 | if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) { | |
3996 | *flags |= RTNH_F_LINKDOWN; | |
3997 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) | |
3998 | *flags |= RTNH_F_DEAD; | |
3999 | } | |
4000 | ||
4001 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
4002 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) | |
4003 | goto nla_put_failure; | |
4004 | } | |
4005 | ||
fe400799 | 4006 | if (rt->rt6i_nh_flags & RTNH_F_OFFLOAD) |
61e4d01e IS |
4007 | *flags |= RTNH_F_OFFLOAD; |
4008 | ||
5be083ce DA |
4009 | /* not needed for multipath encoding b/c it has a rtnexthop struct */ |
4010 | if (!skip_oif && rt->dst.dev && | |
beb1afac DA |
4011 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
4012 | goto nla_put_failure; | |
4013 | ||
4014 | if (rt->dst.lwtstate && | |
4015 | lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0) | |
4016 | goto nla_put_failure; | |
4017 | ||
4018 | return 0; | |
4019 | ||
4020 | nla_put_failure: | |
4021 | return -EMSGSIZE; | |
4022 | } | |
4023 | ||
5be083ce | 4024 | /* add multipath next hop */ |
beb1afac DA |
4025 | static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt) |
4026 | { | |
4027 | struct rtnexthop *rtnh; | |
4028 | unsigned int flags = 0; | |
4029 | ||
4030 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
4031 | if (!rtnh) | |
4032 | goto nla_put_failure; | |
4033 | ||
4034 | rtnh->rtnh_hops = 0; | |
4035 | rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0; | |
4036 | ||
5be083ce | 4037 | if (rt6_nexthop_info(skb, rt, &flags, true) < 0) |
beb1afac DA |
4038 | goto nla_put_failure; |
4039 | ||
4040 | rtnh->rtnh_flags = flags; | |
4041 | ||
4042 | /* length of rtnetlink header + attributes */ | |
4043 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
4044 | ||
4045 | return 0; | |
4046 | ||
4047 | nla_put_failure: | |
4048 | return -EMSGSIZE; | |
339bf98f TG |
4049 | } |
4050 | ||
191cd582 BH |
4051 | static int rt6_fill_node(struct net *net, |
4052 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 4053 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 4054 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 4055 | unsigned int flags) |
1da177e4 | 4056 | { |
4b32b5ad | 4057 | u32 metrics[RTAX_MAX]; |
1da177e4 | 4058 | struct rtmsg *rtm; |
2d7202bf | 4059 | struct nlmsghdr *nlh; |
e3703b3d | 4060 | long expires; |
9e762a4a | 4061 | u32 table; |
1da177e4 | 4062 | |
15e47304 | 4063 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 4064 | if (!nlh) |
26932566 | 4065 | return -EMSGSIZE; |
2d7202bf TG |
4066 | |
4067 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
4068 | rtm->rtm_family = AF_INET6; |
4069 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
4070 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
4071 | rtm->rtm_tos = 0; | |
c71099ac | 4072 | if (rt->rt6i_table) |
9e762a4a | 4073 | table = rt->rt6i_table->tb6_id; |
c71099ac | 4074 | else |
9e762a4a PM |
4075 | table = RT6_TABLE_UNSPEC; |
4076 | rtm->rtm_table = table; | |
c78679e8 DM |
4077 | if (nla_put_u32(skb, RTA_TABLE, table)) |
4078 | goto nla_put_failure; | |
ef2c7d7b ND |
4079 | if (rt->rt6i_flags & RTF_REJECT) { |
4080 | switch (rt->dst.error) { | |
4081 | case -EINVAL: | |
4082 | rtm->rtm_type = RTN_BLACKHOLE; | |
4083 | break; | |
4084 | case -EACCES: | |
4085 | rtm->rtm_type = RTN_PROHIBIT; | |
4086 | break; | |
b4949ab2 ND |
4087 | case -EAGAIN: |
4088 | rtm->rtm_type = RTN_THROW; | |
4089 | break; | |
ef2c7d7b ND |
4090 | default: |
4091 | rtm->rtm_type = RTN_UNREACHABLE; | |
4092 | break; | |
4093 | } | |
4094 | } | |
38308473 | 4095 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 4096 | rtm->rtm_type = RTN_LOCAL; |
4ee39733 DA |
4097 | else if (rt->rt6i_flags & RTF_ANYCAST) |
4098 | rtm->rtm_type = RTN_ANYCAST; | |
d1918542 | 4099 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
4100 | rtm->rtm_type = RTN_LOCAL; |
4101 | else | |
4102 | rtm->rtm_type = RTN_UNICAST; | |
4103 | rtm->rtm_flags = 0; | |
4104 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
4105 | rtm->rtm_protocol = rt->rt6i_protocol; | |
1da177e4 | 4106 | |
38308473 | 4107 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
4108 | rtm->rtm_flags |= RTM_F_CLONED; |
4109 | ||
4110 | if (dst) { | |
930345ea | 4111 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 4112 | goto nla_put_failure; |
1ab1457c | 4113 | rtm->rtm_dst_len = 128; |
1da177e4 | 4114 | } else if (rtm->rtm_dst_len) |
930345ea | 4115 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 4116 | goto nla_put_failure; |
1da177e4 LT |
4117 | #ifdef CONFIG_IPV6_SUBTREES |
4118 | if (src) { | |
930345ea | 4119 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 4120 | goto nla_put_failure; |
1ab1457c | 4121 | rtm->rtm_src_len = 128; |
c78679e8 | 4122 | } else if (rtm->rtm_src_len && |
930345ea | 4123 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 4124 | goto nla_put_failure; |
1da177e4 | 4125 | #endif |
7bc570c8 YH |
4126 | if (iif) { |
4127 | #ifdef CONFIG_IPV6_MROUTE | |
4128 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
fd61c6ba DA |
4129 | int err = ip6mr_get_route(net, skb, rtm, portid); |
4130 | ||
4131 | if (err == 0) | |
4132 | return 0; | |
4133 | if (err < 0) | |
4134 | goto nla_put_failure; | |
7bc570c8 YH |
4135 | } else |
4136 | #endif | |
c78679e8 DM |
4137 | if (nla_put_u32(skb, RTA_IIF, iif)) |
4138 | goto nla_put_failure; | |
7bc570c8 | 4139 | } else if (dst) { |
1da177e4 | 4140 | struct in6_addr saddr_buf; |
c78679e8 | 4141 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 4142 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 4143 | goto nla_put_failure; |
1da177e4 | 4144 | } |
2d7202bf | 4145 | |
c3968a85 DW |
4146 | if (rt->rt6i_prefsrc.plen) { |
4147 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 4148 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 4149 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 4150 | goto nla_put_failure; |
c3968a85 DW |
4151 | } |
4152 | ||
4b32b5ad MKL |
4153 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
4154 | if (rt->rt6i_pmtu) | |
4155 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
4156 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
4157 | goto nla_put_failure; |
4158 | ||
c78679e8 DM |
4159 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) |
4160 | goto nla_put_failure; | |
8253947e | 4161 | |
beb1afac DA |
4162 | /* For multipath routes, walk the siblings list and add |
4163 | * each as a nexthop within RTA_MULTIPATH. | |
4164 | */ | |
4165 | if (rt->rt6i_nsiblings) { | |
4166 | struct rt6_info *sibling, *next_sibling; | |
4167 | struct nlattr *mp; | |
4168 | ||
4169 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
4170 | if (!mp) | |
4171 | goto nla_put_failure; | |
4172 | ||
4173 | if (rt6_add_nexthop(skb, rt) < 0) | |
4174 | goto nla_put_failure; | |
4175 | ||
4176 | list_for_each_entry_safe(sibling, next_sibling, | |
4177 | &rt->rt6i_siblings, rt6i_siblings) { | |
4178 | if (rt6_add_nexthop(skb, sibling) < 0) | |
4179 | goto nla_put_failure; | |
4180 | } | |
4181 | ||
4182 | nla_nest_end(skb, mp); | |
4183 | } else { | |
5be083ce | 4184 | if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0) |
beb1afac DA |
4185 | goto nla_put_failure; |
4186 | } | |
4187 | ||
8253947e | 4188 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; |
69cdf8f9 | 4189 | |
87a50699 | 4190 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 4191 | goto nla_put_failure; |
2d7202bf | 4192 | |
c78ba6d6 LR |
4193 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
4194 | goto nla_put_failure; | |
4195 | ||
19e42e45 | 4196 | |
053c095a JB |
4197 | nlmsg_end(skb, nlh); |
4198 | return 0; | |
2d7202bf TG |
4199 | |
4200 | nla_put_failure: | |
26932566 PM |
4201 | nlmsg_cancel(skb, nlh); |
4202 | return -EMSGSIZE; | |
1da177e4 LT |
4203 | } |
4204 | ||
1b43af54 | 4205 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
4206 | { |
4207 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1f17e2f2 DA |
4208 | struct net *net = arg->net; |
4209 | ||
4210 | if (rt == net->ipv6.ip6_null_entry) | |
4211 | return 0; | |
1da177e4 | 4212 | |
2d7202bf TG |
4213 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
4214 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
f8cfe2ce DA |
4215 | |
4216 | /* user wants prefix routes only */ | |
4217 | if (rtm->rtm_flags & RTM_F_PREFIX && | |
4218 | !(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
4219 | /* success since this is not a prefix route */ | |
4220 | return 1; | |
4221 | } | |
4222 | } | |
1da177e4 | 4223 | |
1f17e2f2 | 4224 | return rt6_fill_node(net, |
191cd582 | 4225 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
15e47304 | 4226 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
f8cfe2ce | 4227 | NLM_F_MULTI); |
1da177e4 LT |
4228 | } |
4229 | ||
c21ef3e3 DA |
4230 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
4231 | struct netlink_ext_ack *extack) | |
1da177e4 | 4232 | { |
3b1e0a65 | 4233 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 4234 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c RP |
4235 | int err, iif = 0, oif = 0; |
4236 | struct dst_entry *dst; | |
ab364a6f | 4237 | struct rt6_info *rt; |
1da177e4 | 4238 | struct sk_buff *skb; |
ab364a6f | 4239 | struct rtmsg *rtm; |
4c9483b2 | 4240 | struct flowi6 fl6; |
18c3a61c | 4241 | bool fibmatch; |
1da177e4 | 4242 | |
fceb6435 | 4243 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
c21ef3e3 | 4244 | extack); |
ab364a6f TG |
4245 | if (err < 0) |
4246 | goto errout; | |
1da177e4 | 4247 | |
ab364a6f | 4248 | err = -EINVAL; |
4c9483b2 | 4249 | memset(&fl6, 0, sizeof(fl6)); |
38b7097b HFS |
4250 | rtm = nlmsg_data(nlh); |
4251 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 4252 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 4253 | |
ab364a6f TG |
4254 | if (tb[RTA_SRC]) { |
4255 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
4256 | goto errout; | |
4257 | ||
4e3fd7a0 | 4258 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
4259 | } |
4260 | ||
4261 | if (tb[RTA_DST]) { | |
4262 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
4263 | goto errout; | |
4264 | ||
4e3fd7a0 | 4265 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
4266 | } |
4267 | ||
4268 | if (tb[RTA_IIF]) | |
4269 | iif = nla_get_u32(tb[RTA_IIF]); | |
4270 | ||
4271 | if (tb[RTA_OIF]) | |
72331bc0 | 4272 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 4273 | |
2e47b291 LC |
4274 | if (tb[RTA_MARK]) |
4275 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
4276 | ||
622ec2c9 LC |
4277 | if (tb[RTA_UID]) |
4278 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
4279 | nla_get_u32(tb[RTA_UID])); | |
4280 | else | |
4281 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
4282 | ||
1da177e4 LT |
4283 | if (iif) { |
4284 | struct net_device *dev; | |
72331bc0 SL |
4285 | int flags = 0; |
4286 | ||
121622db FW |
4287 | rcu_read_lock(); |
4288 | ||
4289 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 4290 | if (!dev) { |
121622db | 4291 | rcu_read_unlock(); |
1da177e4 | 4292 | err = -ENODEV; |
ab364a6f | 4293 | goto errout; |
1da177e4 | 4294 | } |
72331bc0 SL |
4295 | |
4296 | fl6.flowi6_iif = iif; | |
4297 | ||
4298 | if (!ipv6_addr_any(&fl6.saddr)) | |
4299 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
4300 | ||
58acfd71 | 4301 | dst = ip6_route_input_lookup(net, dev, &fl6, flags); |
121622db FW |
4302 | |
4303 | rcu_read_unlock(); | |
72331bc0 SL |
4304 | } else { |
4305 | fl6.flowi6_oif = oif; | |
4306 | ||
58acfd71 | 4307 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
4308 | } |
4309 | ||
18c3a61c RP |
4310 | |
4311 | rt = container_of(dst, struct rt6_info, dst); | |
4312 | if (rt->dst.error) { | |
4313 | err = rt->dst.error; | |
4314 | ip6_rt_put(rt); | |
4315 | goto errout; | |
1da177e4 LT |
4316 | } |
4317 | ||
9d6acb3b WC |
4318 | if (rt == net->ipv6.ip6_null_entry) { |
4319 | err = rt->dst.error; | |
4320 | ip6_rt_put(rt); | |
4321 | goto errout; | |
4322 | } | |
4323 | ||
58acfd71 IS |
4324 | if (fibmatch && rt->dst.from) { |
4325 | struct rt6_info *ort = container_of(rt->dst.from, | |
4326 | struct rt6_info, dst); | |
4327 | ||
4328 | dst_hold(&ort->dst); | |
4329 | ip6_rt_put(rt); | |
4330 | rt = ort; | |
4331 | } | |
4332 | ||
ab364a6f | 4333 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 4334 | if (!skb) { |
94e187c0 | 4335 | ip6_rt_put(rt); |
ab364a6f TG |
4336 | err = -ENOBUFS; |
4337 | goto errout; | |
4338 | } | |
1da177e4 | 4339 | |
d8d1f30b | 4340 | skb_dst_set(skb, &rt->dst); |
18c3a61c RP |
4341 | if (fibmatch) |
4342 | err = rt6_fill_node(net, skb, rt, NULL, NULL, iif, | |
4343 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, | |
4344 | nlh->nlmsg_seq, 0); | |
4345 | else | |
4346 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, | |
4347 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, | |
4348 | nlh->nlmsg_seq, 0); | |
1da177e4 | 4349 | if (err < 0) { |
ab364a6f TG |
4350 | kfree_skb(skb); |
4351 | goto errout; | |
1da177e4 LT |
4352 | } |
4353 | ||
15e47304 | 4354 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 4355 | errout: |
1da177e4 | 4356 | return err; |
1da177e4 LT |
4357 | } |
4358 | ||
37a1d361 RP |
4359 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
4360 | unsigned int nlm_flags) | |
1da177e4 LT |
4361 | { |
4362 | struct sk_buff *skb; | |
5578689a | 4363 | struct net *net = info->nl_net; |
528c4ceb DL |
4364 | u32 seq; |
4365 | int err; | |
4366 | ||
4367 | err = -ENOBUFS; | |
38308473 | 4368 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 4369 | |
19e42e45 | 4370 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 4371 | if (!skb) |
21713ebc TG |
4372 | goto errout; |
4373 | ||
191cd582 | 4374 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
f8cfe2ce | 4375 | event, info->portid, seq, nlm_flags); |
26932566 PM |
4376 | if (err < 0) { |
4377 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
4378 | WARN_ON(err == -EMSGSIZE); | |
4379 | kfree_skb(skb); | |
4380 | goto errout; | |
4381 | } | |
15e47304 | 4382 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
4383 | info->nlh, gfp_any()); |
4384 | return; | |
21713ebc TG |
4385 | errout: |
4386 | if (err < 0) | |
5578689a | 4387 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
4388 | } |
4389 | ||
8ed67789 | 4390 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 4391 | unsigned long event, void *ptr) |
8ed67789 | 4392 | { |
351638e7 | 4393 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 4394 | struct net *net = dev_net(dev); |
8ed67789 | 4395 | |
242d3a49 WC |
4396 | if (!(dev->flags & IFF_LOOPBACK)) |
4397 | return NOTIFY_OK; | |
4398 | ||
4399 | if (event == NETDEV_REGISTER) { | |
d8d1f30b | 4400 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
4401 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
4402 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 4403 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 4404 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 4405 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 4406 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 4407 | #endif |
76da0704 WC |
4408 | } else if (event == NETDEV_UNREGISTER && |
4409 | dev->reg_state != NETREG_UNREGISTERED) { | |
4410 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
4411 | * netdev_wait_allrefs(). Make sure we only call this once. | |
4412 | */ | |
12d94a80 | 4413 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 4414 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
4415 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
4416 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
4417 | #endif |
4418 | } | |
4419 | ||
4420 | return NOTIFY_OK; | |
4421 | } | |
4422 | ||
1da177e4 LT |
4423 | /* |
4424 | * /proc | |
4425 | */ | |
4426 | ||
4427 | #ifdef CONFIG_PROC_FS | |
4428 | ||
33120b30 AD |
4429 | static const struct file_operations ipv6_route_proc_fops = { |
4430 | .owner = THIS_MODULE, | |
4431 | .open = ipv6_route_open, | |
4432 | .read = seq_read, | |
4433 | .llseek = seq_lseek, | |
8d2ca1d7 | 4434 | .release = seq_release_net, |
33120b30 AD |
4435 | }; |
4436 | ||
1da177e4 LT |
4437 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
4438 | { | |
69ddb805 | 4439 | struct net *net = (struct net *)seq->private; |
1da177e4 | 4440 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
4441 | net->ipv6.rt6_stats->fib_nodes, |
4442 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 4443 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
4444 | net->ipv6.rt6_stats->fib_rt_entries, |
4445 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 4446 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 4447 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
4448 | |
4449 | return 0; | |
4450 | } | |
4451 | ||
4452 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
4453 | { | |
de05c557 | 4454 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
4455 | } |
4456 | ||
9a32144e | 4457 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
4458 | .owner = THIS_MODULE, |
4459 | .open = rt6_stats_seq_open, | |
4460 | .read = seq_read, | |
4461 | .llseek = seq_lseek, | |
b6fcbdb4 | 4462 | .release = single_release_net, |
1da177e4 LT |
4463 | }; |
4464 | #endif /* CONFIG_PROC_FS */ | |
4465 | ||
4466 | #ifdef CONFIG_SYSCTL | |
4467 | ||
1da177e4 | 4468 | static |
fe2c6338 | 4469 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
4470 | void __user *buffer, size_t *lenp, loff_t *ppos) |
4471 | { | |
c486da34 LAG |
4472 | struct net *net; |
4473 | int delay; | |
4474 | if (!write) | |
1da177e4 | 4475 | return -EINVAL; |
c486da34 LAG |
4476 | |
4477 | net = (struct net *)ctl->extra1; | |
4478 | delay = net->ipv6.sysctl.flush_delay; | |
4479 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 4480 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 4481 | return 0; |
1da177e4 LT |
4482 | } |
4483 | ||
fe2c6338 | 4484 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 4485 | { |
1da177e4 | 4486 | .procname = "flush", |
4990509f | 4487 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 4488 | .maxlen = sizeof(int), |
89c8b3a1 | 4489 | .mode = 0200, |
6d9f239a | 4490 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
4491 | }, |
4492 | { | |
1da177e4 | 4493 | .procname = "gc_thresh", |
9a7ec3a9 | 4494 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
4495 | .maxlen = sizeof(int), |
4496 | .mode = 0644, | |
6d9f239a | 4497 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4498 | }, |
4499 | { | |
1da177e4 | 4500 | .procname = "max_size", |
4990509f | 4501 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
4502 | .maxlen = sizeof(int), |
4503 | .mode = 0644, | |
6d9f239a | 4504 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4505 | }, |
4506 | { | |
1da177e4 | 4507 | .procname = "gc_min_interval", |
4990509f | 4508 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
4509 | .maxlen = sizeof(int), |
4510 | .mode = 0644, | |
6d9f239a | 4511 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4512 | }, |
4513 | { | |
1da177e4 | 4514 | .procname = "gc_timeout", |
4990509f | 4515 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
4516 | .maxlen = sizeof(int), |
4517 | .mode = 0644, | |
6d9f239a | 4518 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4519 | }, |
4520 | { | |
1da177e4 | 4521 | .procname = "gc_interval", |
4990509f | 4522 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
4523 | .maxlen = sizeof(int), |
4524 | .mode = 0644, | |
6d9f239a | 4525 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4526 | }, |
4527 | { | |
1da177e4 | 4528 | .procname = "gc_elasticity", |
4990509f | 4529 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
4530 | .maxlen = sizeof(int), |
4531 | .mode = 0644, | |
f3d3f616 | 4532 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4533 | }, |
4534 | { | |
1da177e4 | 4535 | .procname = "mtu_expires", |
4990509f | 4536 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
4537 | .maxlen = sizeof(int), |
4538 | .mode = 0644, | |
6d9f239a | 4539 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4540 | }, |
4541 | { | |
1da177e4 | 4542 | .procname = "min_adv_mss", |
4990509f | 4543 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
4544 | .maxlen = sizeof(int), |
4545 | .mode = 0644, | |
f3d3f616 | 4546 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4547 | }, |
4548 | { | |
1da177e4 | 4549 | .procname = "gc_min_interval_ms", |
4990509f | 4550 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
4551 | .maxlen = sizeof(int), |
4552 | .mode = 0644, | |
6d9f239a | 4553 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 4554 | }, |
f8572d8f | 4555 | { } |
1da177e4 LT |
4556 | }; |
4557 | ||
2c8c1e72 | 4558 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
4559 | { |
4560 | struct ctl_table *table; | |
4561 | ||
4562 | table = kmemdup(ipv6_route_table_template, | |
4563 | sizeof(ipv6_route_table_template), | |
4564 | GFP_KERNEL); | |
5ee09105 YH |
4565 | |
4566 | if (table) { | |
4567 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 4568 | table[0].extra1 = net; |
86393e52 | 4569 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
4570 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
4571 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
4572 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
4573 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
4574 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
4575 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
4576 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 4577 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
4578 | |
4579 | /* Don't export sysctls to unprivileged users */ | |
4580 | if (net->user_ns != &init_user_ns) | |
4581 | table[0].procname = NULL; | |
5ee09105 YH |
4582 | } |
4583 | ||
760f2d01 DL |
4584 | return table; |
4585 | } | |
1da177e4 LT |
4586 | #endif |
4587 | ||
2c8c1e72 | 4588 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 4589 | { |
633d424b | 4590 | int ret = -ENOMEM; |
8ed67789 | 4591 | |
86393e52 AD |
4592 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
4593 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 4594 | |
fc66f95c ED |
4595 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
4596 | goto out_ip6_dst_ops; | |
4597 | ||
8ed67789 DL |
4598 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
4599 | sizeof(*net->ipv6.ip6_null_entry), | |
4600 | GFP_KERNEL); | |
4601 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 4602 | goto out_ip6_dst_entries; |
d8d1f30b | 4603 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 4604 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 4605 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
4606 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
4607 | ip6_template_metrics, true); | |
8ed67789 DL |
4608 | |
4609 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 4610 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
4611 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
4612 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
4613 | GFP_KERNEL); | |
68fffc67 PZ |
4614 | if (!net->ipv6.ip6_prohibit_entry) |
4615 | goto out_ip6_null_entry; | |
d8d1f30b | 4616 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 4617 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 4618 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
4619 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
4620 | ip6_template_metrics, true); | |
8ed67789 DL |
4621 | |
4622 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
4623 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
4624 | GFP_KERNEL); | |
68fffc67 PZ |
4625 | if (!net->ipv6.ip6_blk_hole_entry) |
4626 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 4627 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 4628 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 4629 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
4630 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
4631 | ip6_template_metrics, true); | |
8ed67789 DL |
4632 | #endif |
4633 | ||
b339a47c PZ |
4634 | net->ipv6.sysctl.flush_delay = 0; |
4635 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
4636 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
4637 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
4638 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
4639 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
4640 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
4641 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
4642 | ||
6891a346 BT |
4643 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
4644 | ||
8ed67789 DL |
4645 | ret = 0; |
4646 | out: | |
4647 | return ret; | |
f2fc6a54 | 4648 | |
68fffc67 PZ |
4649 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
4650 | out_ip6_prohibit_entry: | |
4651 | kfree(net->ipv6.ip6_prohibit_entry); | |
4652 | out_ip6_null_entry: | |
4653 | kfree(net->ipv6.ip6_null_entry); | |
4654 | #endif | |
fc66f95c ED |
4655 | out_ip6_dst_entries: |
4656 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 4657 | out_ip6_dst_ops: |
f2fc6a54 | 4658 | goto out; |
cdb18761 DL |
4659 | } |
4660 | ||
2c8c1e72 | 4661 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 4662 | { |
8ed67789 DL |
4663 | kfree(net->ipv6.ip6_null_entry); |
4664 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
4665 | kfree(net->ipv6.ip6_prohibit_entry); | |
4666 | kfree(net->ipv6.ip6_blk_hole_entry); | |
4667 | #endif | |
41bb78b4 | 4668 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
4669 | } |
4670 | ||
d189634e TG |
4671 | static int __net_init ip6_route_net_init_late(struct net *net) |
4672 | { | |
4673 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
4674 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
4675 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
4676 | #endif |
4677 | return 0; | |
4678 | } | |
4679 | ||
4680 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
4681 | { | |
4682 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
4683 | remove_proc_entry("ipv6_route", net->proc_net); |
4684 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
4685 | #endif |
4686 | } | |
4687 | ||
cdb18761 DL |
4688 | static struct pernet_operations ip6_route_net_ops = { |
4689 | .init = ip6_route_net_init, | |
4690 | .exit = ip6_route_net_exit, | |
4691 | }; | |
4692 | ||
c3426b47 DM |
4693 | static int __net_init ipv6_inetpeer_init(struct net *net) |
4694 | { | |
4695 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
4696 | ||
4697 | if (!bp) | |
4698 | return -ENOMEM; | |
4699 | inet_peer_base_init(bp); | |
4700 | net->ipv6.peers = bp; | |
4701 | return 0; | |
4702 | } | |
4703 | ||
4704 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
4705 | { | |
4706 | struct inet_peer_base *bp = net->ipv6.peers; | |
4707 | ||
4708 | net->ipv6.peers = NULL; | |
56a6b248 | 4709 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
4710 | kfree(bp); |
4711 | } | |
4712 | ||
2b823f72 | 4713 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
4714 | .init = ipv6_inetpeer_init, |
4715 | .exit = ipv6_inetpeer_exit, | |
4716 | }; | |
4717 | ||
d189634e TG |
4718 | static struct pernet_operations ip6_route_net_late_ops = { |
4719 | .init = ip6_route_net_init_late, | |
4720 | .exit = ip6_route_net_exit_late, | |
4721 | }; | |
4722 | ||
8ed67789 DL |
4723 | static struct notifier_block ip6_route_dev_notifier = { |
4724 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 4725 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
4726 | }; |
4727 | ||
2f460933 WC |
4728 | void __init ip6_route_init_special_entries(void) |
4729 | { | |
4730 | /* Registering of the loopback is done before this portion of code, | |
4731 | * the loopback reference in rt6_info will not be taken, do it | |
4732 | * manually for init_net */ | |
4733 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; | |
4734 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4735 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
4736 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
4737 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4738 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
4739 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4740 | #endif | |
4741 | } | |
4742 | ||
433d49c3 | 4743 | int __init ip6_route_init(void) |
1da177e4 | 4744 | { |
433d49c3 | 4745 | int ret; |
8d0b94af | 4746 | int cpu; |
433d49c3 | 4747 | |
9a7ec3a9 DL |
4748 | ret = -ENOMEM; |
4749 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 4750 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 4751 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 4752 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 4753 | goto out; |
14e50e57 | 4754 | |
fc66f95c | 4755 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 4756 | if (ret) |
bdb3289f | 4757 | goto out_kmem_cache; |
bdb3289f | 4758 | |
c3426b47 DM |
4759 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
4760 | if (ret) | |
e8803b6c | 4761 | goto out_dst_entries; |
2a0c451a | 4762 | |
7e52b33b DM |
4763 | ret = register_pernet_subsys(&ip6_route_net_ops); |
4764 | if (ret) | |
4765 | goto out_register_inetpeer; | |
c3426b47 | 4766 | |
5dc121e9 AE |
4767 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
4768 | ||
e8803b6c | 4769 | ret = fib6_init(); |
433d49c3 | 4770 | if (ret) |
8ed67789 | 4771 | goto out_register_subsys; |
433d49c3 | 4772 | |
433d49c3 DL |
4773 | ret = xfrm6_init(); |
4774 | if (ret) | |
e8803b6c | 4775 | goto out_fib6_init; |
c35b7e72 | 4776 | |
433d49c3 DL |
4777 | ret = fib6_rules_init(); |
4778 | if (ret) | |
4779 | goto xfrm6_init; | |
7e5449c2 | 4780 | |
d189634e TG |
4781 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
4782 | if (ret) | |
4783 | goto fib6_rules_init; | |
4784 | ||
433d49c3 | 4785 | ret = -ENOBUFS; |
b97bac64 FW |
4786 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, 0) || |
4787 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, 0) || | |
e3a22b7f FW |
4788 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, |
4789 | RTNL_FLAG_DOIT_UNLOCKED)) | |
d189634e | 4790 | goto out_register_late_subsys; |
c127ea2c | 4791 | |
8ed67789 | 4792 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 4793 | if (ret) |
d189634e | 4794 | goto out_register_late_subsys; |
8ed67789 | 4795 | |
8d0b94af MKL |
4796 | for_each_possible_cpu(cpu) { |
4797 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
4798 | ||
4799 | INIT_LIST_HEAD(&ul->head); | |
4800 | spin_lock_init(&ul->lock); | |
4801 | } | |
4802 | ||
433d49c3 DL |
4803 | out: |
4804 | return ret; | |
4805 | ||
d189634e TG |
4806 | out_register_late_subsys: |
4807 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 4808 | fib6_rules_init: |
433d49c3 DL |
4809 | fib6_rules_cleanup(); |
4810 | xfrm6_init: | |
433d49c3 | 4811 | xfrm6_fini(); |
2a0c451a TG |
4812 | out_fib6_init: |
4813 | fib6_gc_cleanup(); | |
8ed67789 DL |
4814 | out_register_subsys: |
4815 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
4816 | out_register_inetpeer: |
4817 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
4818 | out_dst_entries: |
4819 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 4820 | out_kmem_cache: |
f2fc6a54 | 4821 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 4822 | goto out; |
1da177e4 LT |
4823 | } |
4824 | ||
4825 | void ip6_route_cleanup(void) | |
4826 | { | |
8ed67789 | 4827 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 4828 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 4829 | fib6_rules_cleanup(); |
1da177e4 | 4830 | xfrm6_fini(); |
1da177e4 | 4831 | fib6_gc_cleanup(); |
c3426b47 | 4832 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 4833 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 4834 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 4835 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 4836 | } |