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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> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
904af04d | 57 | #include <net/dst_metadata.h> |
1da177e4 | 58 | #include <net/xfrm.h> |
8d71740c | 59 | #include <net/netevent.h> |
21713ebc | 60 | #include <net/netlink.h> |
51ebd318 | 61 | #include <net/nexthop.h> |
19e42e45 | 62 | #include <net/lwtunnel.h> |
904af04d | 63 | #include <net/ip_tunnels.h> |
ca254490 | 64 | #include <net/l3mdev.h> |
b811580d | 65 | #include <trace/events/fib6.h> |
1da177e4 | 66 | |
7c0f6ba6 | 67 | #include <linux/uaccess.h> |
1da177e4 LT |
68 | |
69 | #ifdef CONFIG_SYSCTL | |
70 | #include <linux/sysctl.h> | |
71 | #endif | |
72 | ||
afc154e9 | 73 | enum rt6_nud_state { |
7e980569 JB |
74 | RT6_NUD_FAIL_HARD = -3, |
75 | RT6_NUD_FAIL_PROBE = -2, | |
76 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
77 | RT6_NUD_SUCCEED = 1 |
78 | }; | |
79 | ||
83a09abd | 80 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 81 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 82 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 83 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
84 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
85 | static void ip6_dst_destroy(struct dst_entry *); | |
86 | static void ip6_dst_ifdown(struct dst_entry *, | |
87 | struct net_device *dev, int how); | |
569d3645 | 88 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
89 | |
90 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 91 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 92 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 93 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 94 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
95 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
96 | struct sk_buff *skb, u32 mtu); | |
97 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
98 | struct sk_buff *skb); | |
4b32b5ad | 99 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 100 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
16a16cd3 DA |
101 | static size_t rt6_nlmsg_size(struct rt6_info *rt); |
102 | static int rt6_fill_node(struct net *net, | |
103 | struct sk_buff *skb, struct rt6_info *rt, | |
104 | struct in6_addr *dst, struct in6_addr *src, | |
105 | int iif, int type, u32 portid, u32 seq, | |
106 | unsigned int flags); | |
1da177e4 | 107 | |
70ceb4f5 | 108 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 109 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 110 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
111 | const struct in6_addr *gwaddr, |
112 | struct net_device *dev, | |
95c96174 | 113 | unsigned int pref); |
efa2cea0 | 114 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 115 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
116 | const struct in6_addr *gwaddr, |
117 | struct net_device *dev); | |
70ceb4f5 YH |
118 | #endif |
119 | ||
8d0b94af MKL |
120 | struct uncached_list { |
121 | spinlock_t lock; | |
122 | struct list_head head; | |
123 | }; | |
124 | ||
125 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
126 | ||
127 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
128 | { | |
129 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
130 | ||
131 | rt->dst.flags |= DST_NOCACHE; | |
132 | rt->rt6i_uncached_list = ul; | |
133 | ||
134 | spin_lock_bh(&ul->lock); | |
135 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
136 | spin_unlock_bh(&ul->lock); | |
137 | } | |
138 | ||
139 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
140 | { | |
141 | if (!list_empty(&rt->rt6i_uncached)) { | |
142 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
143 | ||
144 | spin_lock_bh(&ul->lock); | |
145 | list_del(&rt->rt6i_uncached); | |
146 | spin_unlock_bh(&ul->lock); | |
147 | } | |
148 | } | |
149 | ||
150 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
151 | { | |
152 | struct net_device *loopback_dev = net->loopback_dev; | |
153 | int cpu; | |
154 | ||
e332bc67 EB |
155 | if (dev == loopback_dev) |
156 | return; | |
157 | ||
8d0b94af MKL |
158 | for_each_possible_cpu(cpu) { |
159 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
160 | struct rt6_info *rt; | |
161 | ||
162 | spin_lock_bh(&ul->lock); | |
163 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
164 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
165 | struct net_device *rt_dev = rt->dst.dev; | |
166 | ||
e332bc67 | 167 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
168 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
169 | in6_dev_put(rt_idev); | |
170 | } | |
171 | ||
e332bc67 | 172 | if (rt_dev == dev) { |
8d0b94af MKL |
173 | rt->dst.dev = loopback_dev; |
174 | dev_hold(rt->dst.dev); | |
175 | dev_put(rt_dev); | |
176 | } | |
177 | } | |
178 | spin_unlock_bh(&ul->lock); | |
179 | } | |
180 | } | |
181 | ||
d52d3997 MKL |
182 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
183 | { | |
184 | return dst_metrics_write_ptr(rt->dst.from); | |
185 | } | |
186 | ||
06582540 DM |
187 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
188 | { | |
4b32b5ad | 189 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 190 | |
d52d3997 MKL |
191 | if (rt->rt6i_flags & RTF_PCPU) |
192 | return rt6_pcpu_cow_metrics(rt); | |
193 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
194 | return NULL; |
195 | else | |
3b471175 | 196 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
197 | } |
198 | ||
f894cbf8 DM |
199 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
200 | struct sk_buff *skb, | |
201 | const void *daddr) | |
39232973 DM |
202 | { |
203 | struct in6_addr *p = &rt->rt6i_gateway; | |
204 | ||
a7563f34 | 205 | if (!ipv6_addr_any(p)) |
39232973 | 206 | return (const void *) p; |
f894cbf8 DM |
207 | else if (skb) |
208 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
209 | return daddr; |
210 | } | |
211 | ||
f894cbf8 DM |
212 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
213 | struct sk_buff *skb, | |
214 | const void *daddr) | |
d3aaeb38 | 215 | { |
39232973 DM |
216 | struct rt6_info *rt = (struct rt6_info *) dst; |
217 | struct neighbour *n; | |
218 | ||
f894cbf8 | 219 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 220 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
221 | if (n) |
222 | return n; | |
223 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
224 | } | |
225 | ||
63fca65d JA |
226 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
227 | { | |
228 | struct net_device *dev = dst->dev; | |
229 | struct rt6_info *rt = (struct rt6_info *)dst; | |
230 | ||
231 | daddr = choose_neigh_daddr(rt, NULL, daddr); | |
232 | if (!daddr) | |
233 | return; | |
234 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
235 | return; | |
236 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
237 | return; | |
238 | __ipv6_confirm_neigh(dev, daddr); | |
239 | } | |
240 | ||
9a7ec3a9 | 241 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 242 | .family = AF_INET6, |
1da177e4 LT |
243 | .gc = ip6_dst_gc, |
244 | .gc_thresh = 1024, | |
245 | .check = ip6_dst_check, | |
0dbaee3b | 246 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 247 | .mtu = ip6_mtu, |
06582540 | 248 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
249 | .destroy = ip6_dst_destroy, |
250 | .ifdown = ip6_dst_ifdown, | |
251 | .negative_advice = ip6_negative_advice, | |
252 | .link_failure = ip6_link_failure, | |
253 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 254 | .redirect = rt6_do_redirect, |
9f8955cc | 255 | .local_out = __ip6_local_out, |
d3aaeb38 | 256 | .neigh_lookup = ip6_neigh_lookup, |
63fca65d | 257 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
258 | }; |
259 | ||
ebb762f2 | 260 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 261 | { |
618f9bc7 SK |
262 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
263 | ||
264 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
265 | } |
266 | ||
6700c270 DM |
267 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
268 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
269 | { |
270 | } | |
271 | ||
6700c270 DM |
272 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
273 | struct sk_buff *skb) | |
b587ee3b DM |
274 | { |
275 | } | |
276 | ||
14e50e57 DM |
277 | static struct dst_ops ip6_dst_blackhole_ops = { |
278 | .family = AF_INET6, | |
14e50e57 DM |
279 | .destroy = ip6_dst_destroy, |
280 | .check = ip6_dst_check, | |
ebb762f2 | 281 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 282 | .default_advmss = ip6_default_advmss, |
14e50e57 | 283 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 284 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 285 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 286 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
287 | }; |
288 | ||
62fa8a84 | 289 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 290 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
291 | }; |
292 | ||
fb0af4c7 | 293 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
294 | .dst = { |
295 | .__refcnt = ATOMIC_INIT(1), | |
296 | .__use = 1, | |
2c20cbd7 | 297 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 298 | .error = -ENETUNREACH, |
d8d1f30b CG |
299 | .input = ip6_pkt_discard, |
300 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
301 | }, |
302 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 303 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
304 | .rt6i_metric = ~(u32) 0, |
305 | .rt6i_ref = ATOMIC_INIT(1), | |
306 | }; | |
307 | ||
101367c2 TG |
308 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
309 | ||
fb0af4c7 | 310 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
311 | .dst = { |
312 | .__refcnt = ATOMIC_INIT(1), | |
313 | .__use = 1, | |
2c20cbd7 | 314 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 315 | .error = -EACCES, |
d8d1f30b CG |
316 | .input = ip6_pkt_prohibit, |
317 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
318 | }, |
319 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 320 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
321 | .rt6i_metric = ~(u32) 0, |
322 | .rt6i_ref = ATOMIC_INIT(1), | |
323 | }; | |
324 | ||
fb0af4c7 | 325 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
326 | .dst = { |
327 | .__refcnt = ATOMIC_INIT(1), | |
328 | .__use = 1, | |
2c20cbd7 | 329 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 330 | .error = -EINVAL, |
d8d1f30b | 331 | .input = dst_discard, |
ede2059d | 332 | .output = dst_discard_out, |
101367c2 TG |
333 | }, |
334 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 335 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
336 | .rt6i_metric = ~(u32) 0, |
337 | .rt6i_ref = ATOMIC_INIT(1), | |
338 | }; | |
339 | ||
340 | #endif | |
341 | ||
ebfa45f0 MKL |
342 | static void rt6_info_init(struct rt6_info *rt) |
343 | { | |
344 | struct dst_entry *dst = &rt->dst; | |
345 | ||
346 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
347 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
348 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
349 | } | |
350 | ||
1da177e4 | 351 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
352 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
353 | struct net_device *dev, | |
ad706862 | 354 | int flags) |
1da177e4 | 355 | { |
97bab73f | 356 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 357 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 358 | |
ebfa45f0 MKL |
359 | if (rt) |
360 | rt6_info_init(rt); | |
8104891b | 361 | |
cf911662 | 362 | return rt; |
1da177e4 LT |
363 | } |
364 | ||
9ab179d8 DA |
365 | struct rt6_info *ip6_dst_alloc(struct net *net, |
366 | struct net_device *dev, | |
367 | int flags) | |
d52d3997 | 368 | { |
ad706862 | 369 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
370 | |
371 | if (rt) { | |
372 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
373 | if (rt->rt6i_pcpu) { | |
374 | int cpu; | |
375 | ||
376 | for_each_possible_cpu(cpu) { | |
377 | struct rt6_info **p; | |
378 | ||
379 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
380 | /* no one shares rt */ | |
381 | *p = NULL; | |
382 | } | |
383 | } else { | |
384 | dst_destroy((struct dst_entry *)rt); | |
385 | return NULL; | |
386 | } | |
387 | } | |
388 | ||
389 | return rt; | |
390 | } | |
9ab179d8 | 391 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 392 | |
1da177e4 LT |
393 | static void ip6_dst_destroy(struct dst_entry *dst) |
394 | { | |
395 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 396 | struct dst_entry *from = dst->from; |
8d0b94af | 397 | struct inet6_dev *idev; |
1da177e4 | 398 | |
4b32b5ad | 399 | dst_destroy_metrics_generic(dst); |
87775312 | 400 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
401 | rt6_uncached_list_del(rt); |
402 | ||
403 | idev = rt->rt6i_idev; | |
38308473 | 404 | if (idev) { |
1da177e4 LT |
405 | rt->rt6i_idev = NULL; |
406 | in6_dev_put(idev); | |
1ab1457c | 407 | } |
1716a961 | 408 | |
ecd98837 YH |
409 | dst->from = NULL; |
410 | dst_release(from); | |
b3419363 DM |
411 | } |
412 | ||
1da177e4 LT |
413 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
414 | int how) | |
415 | { | |
416 | struct rt6_info *rt = (struct rt6_info *)dst; | |
417 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 418 | struct net_device *loopback_dev = |
c346dca1 | 419 | dev_net(dev)->loopback_dev; |
1da177e4 | 420 | |
97cac082 DM |
421 | if (dev != loopback_dev) { |
422 | if (idev && idev->dev == dev) { | |
423 | struct inet6_dev *loopback_idev = | |
424 | in6_dev_get(loopback_dev); | |
425 | if (loopback_idev) { | |
426 | rt->rt6i_idev = loopback_idev; | |
427 | in6_dev_put(idev); | |
428 | } | |
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) { |
3fd91fb3 | 447 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 448 | } |
a50feda5 | 449 | return false; |
1da177e4 LT |
450 | } |
451 | ||
51ebd318 ND |
452 | /* Multipath route selection: |
453 | * Hash based function using packet header and flowlabel. | |
454 | * Adapted from fib_info_hashfn() | |
455 | */ | |
456 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
457 | const struct flowi6 *fl6) | |
458 | { | |
644d0e65 | 459 | return get_hash_from_flowi6(fl6) % candidate_count; |
51ebd318 ND |
460 | } |
461 | ||
462 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
463 | struct flowi6 *fl6, int oif, |
464 | int strict) | |
51ebd318 ND |
465 | { |
466 | struct rt6_info *sibling, *next_sibling; | |
467 | int route_choosen; | |
468 | ||
469 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
470 | /* Don't change the route, if route_choosen == 0 | |
471 | * (siblings does not include ourself) | |
472 | */ | |
473 | if (route_choosen) | |
474 | list_for_each_entry_safe(sibling, next_sibling, | |
475 | &match->rt6i_siblings, rt6i_siblings) { | |
476 | route_choosen--; | |
477 | if (route_choosen == 0) { | |
52bd4c0c ND |
478 | if (rt6_score_route(sibling, oif, strict) < 0) |
479 | break; | |
51ebd318 ND |
480 | match = sibling; |
481 | break; | |
482 | } | |
483 | } | |
484 | return match; | |
485 | } | |
486 | ||
1da177e4 | 487 | /* |
c71099ac | 488 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
489 | */ |
490 | ||
8ed67789 DL |
491 | static inline struct rt6_info *rt6_device_match(struct net *net, |
492 | struct rt6_info *rt, | |
b71d1d42 | 493 | const struct in6_addr *saddr, |
1da177e4 | 494 | int oif, |
d420895e | 495 | int flags) |
1da177e4 LT |
496 | { |
497 | struct rt6_info *local = NULL; | |
498 | struct rt6_info *sprt; | |
499 | ||
dd3abc4e YH |
500 | if (!oif && ipv6_addr_any(saddr)) |
501 | goto out; | |
502 | ||
d8d1f30b | 503 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 504 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
505 | |
506 | if (oif) { | |
1da177e4 LT |
507 | if (dev->ifindex == oif) |
508 | return sprt; | |
509 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 510 | if (!sprt->rt6i_idev || |
1da177e4 | 511 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 512 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 513 | continue; |
17fb0b2b DA |
514 | if (local && |
515 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
516 | continue; |
517 | } | |
518 | local = sprt; | |
519 | } | |
dd3abc4e YH |
520 | } else { |
521 | if (ipv6_chk_addr(net, saddr, dev, | |
522 | flags & RT6_LOOKUP_F_IFACE)) | |
523 | return sprt; | |
1da177e4 | 524 | } |
dd3abc4e | 525 | } |
1da177e4 | 526 | |
dd3abc4e | 527 | if (oif) { |
1da177e4 LT |
528 | if (local) |
529 | return local; | |
530 | ||
d420895e | 531 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 532 | return net->ipv6.ip6_null_entry; |
1da177e4 | 533 | } |
dd3abc4e | 534 | out: |
1da177e4 LT |
535 | return rt; |
536 | } | |
537 | ||
27097255 | 538 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
539 | struct __rt6_probe_work { |
540 | struct work_struct work; | |
541 | struct in6_addr target; | |
542 | struct net_device *dev; | |
543 | }; | |
544 | ||
545 | static void rt6_probe_deferred(struct work_struct *w) | |
546 | { | |
547 | struct in6_addr mcaddr; | |
548 | struct __rt6_probe_work *work = | |
549 | container_of(w, struct __rt6_probe_work, work); | |
550 | ||
551 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 552 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 553 | dev_put(work->dev); |
662f5533 | 554 | kfree(work); |
c2f17e82 HFS |
555 | } |
556 | ||
27097255 YH |
557 | static void rt6_probe(struct rt6_info *rt) |
558 | { | |
990edb42 | 559 | struct __rt6_probe_work *work; |
f2c31e32 | 560 | struct neighbour *neigh; |
27097255 YH |
561 | /* |
562 | * Okay, this does not seem to be appropriate | |
563 | * for now, however, we need to check if it | |
564 | * is really so; aka Router Reachability Probing. | |
565 | * | |
566 | * Router Reachability Probe MUST be rate-limited | |
567 | * to no more than one per minute. | |
568 | */ | |
2152caea | 569 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 570 | return; |
2152caea YH |
571 | rcu_read_lock_bh(); |
572 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
573 | if (neigh) { | |
8d6c31bf MKL |
574 | if (neigh->nud_state & NUD_VALID) |
575 | goto out; | |
576 | ||
990edb42 | 577 | work = NULL; |
2152caea | 578 | write_lock(&neigh->lock); |
990edb42 MKL |
579 | if (!(neigh->nud_state & NUD_VALID) && |
580 | time_after(jiffies, | |
581 | neigh->updated + | |
582 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
583 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
584 | if (work) | |
585 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 586 | } |
2152caea | 587 | write_unlock(&neigh->lock); |
990edb42 MKL |
588 | } else { |
589 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 590 | } |
990edb42 MKL |
591 | |
592 | if (work) { | |
593 | INIT_WORK(&work->work, rt6_probe_deferred); | |
594 | work->target = rt->rt6i_gateway; | |
595 | dev_hold(rt->dst.dev); | |
596 | work->dev = rt->dst.dev; | |
597 | schedule_work(&work->work); | |
598 | } | |
599 | ||
8d6c31bf | 600 | out: |
2152caea | 601 | rcu_read_unlock_bh(); |
27097255 YH |
602 | } |
603 | #else | |
604 | static inline void rt6_probe(struct rt6_info *rt) | |
605 | { | |
27097255 YH |
606 | } |
607 | #endif | |
608 | ||
1da177e4 | 609 | /* |
554cfb7e | 610 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 611 | */ |
b6f99a21 | 612 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 613 | { |
d1918542 | 614 | struct net_device *dev = rt->dst.dev; |
161980f4 | 615 | if (!oif || dev->ifindex == oif) |
554cfb7e | 616 | return 2; |
161980f4 DM |
617 | if ((dev->flags & IFF_LOOPBACK) && |
618 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
619 | return 1; | |
620 | return 0; | |
554cfb7e | 621 | } |
1da177e4 | 622 | |
afc154e9 | 623 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 624 | { |
f2c31e32 | 625 | struct neighbour *neigh; |
afc154e9 | 626 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 627 | |
4d0c5911 YH |
628 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
629 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 630 | return RT6_NUD_SUCCEED; |
145a3621 YH |
631 | |
632 | rcu_read_lock_bh(); | |
633 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
634 | if (neigh) { | |
635 | read_lock(&neigh->lock); | |
554cfb7e | 636 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 637 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 638 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 639 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 640 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
641 | else |
642 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 643 | #endif |
145a3621 | 644 | read_unlock(&neigh->lock); |
afc154e9 HFS |
645 | } else { |
646 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 647 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 648 | } |
145a3621 YH |
649 | rcu_read_unlock_bh(); |
650 | ||
a5a81f0b | 651 | return ret; |
1da177e4 LT |
652 | } |
653 | ||
554cfb7e YH |
654 | static int rt6_score_route(struct rt6_info *rt, int oif, |
655 | int strict) | |
1da177e4 | 656 | { |
a5a81f0b | 657 | int m; |
1ab1457c | 658 | |
4d0c5911 | 659 | m = rt6_check_dev(rt, oif); |
77d16f45 | 660 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 661 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
662 | #ifdef CONFIG_IPV6_ROUTER_PREF |
663 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
664 | #endif | |
afc154e9 HFS |
665 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
666 | int n = rt6_check_neigh(rt); | |
667 | if (n < 0) | |
668 | return n; | |
669 | } | |
554cfb7e YH |
670 | return m; |
671 | } | |
672 | ||
f11e6659 | 673 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
674 | int *mpri, struct rt6_info *match, |
675 | bool *do_rr) | |
554cfb7e | 676 | { |
f11e6659 | 677 | int m; |
afc154e9 | 678 | bool match_do_rr = false; |
35103d11 AG |
679 | struct inet6_dev *idev = rt->rt6i_idev; |
680 | struct net_device *dev = rt->dst.dev; | |
681 | ||
682 | if (dev && !netif_carrier_ok(dev) && | |
d5d32e4b DA |
683 | idev->cnf.ignore_routes_with_linkdown && |
684 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) | |
35103d11 | 685 | goto out; |
f11e6659 DM |
686 | |
687 | if (rt6_check_expired(rt)) | |
688 | goto out; | |
689 | ||
690 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 691 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
692 | match_do_rr = true; |
693 | m = 0; /* lowest valid score */ | |
7e980569 | 694 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 695 | goto out; |
afc154e9 HFS |
696 | } |
697 | ||
698 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
699 | rt6_probe(rt); | |
f11e6659 | 700 | |
7e980569 | 701 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 702 | if (m > *mpri) { |
afc154e9 | 703 | *do_rr = match_do_rr; |
f11e6659 DM |
704 | *mpri = m; |
705 | match = rt; | |
f11e6659 | 706 | } |
f11e6659 DM |
707 | out: |
708 | return match; | |
709 | } | |
710 | ||
711 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
712 | struct rt6_info *rr_head, | |
afc154e9 HFS |
713 | u32 metric, int oif, int strict, |
714 | bool *do_rr) | |
f11e6659 | 715 | { |
9fbdcfaf | 716 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 717 | int mpri = -1; |
1da177e4 | 718 | |
f11e6659 | 719 | match = NULL; |
9fbdcfaf SK |
720 | cont = NULL; |
721 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
722 | if (rt->rt6i_metric != metric) { | |
723 | cont = rt; | |
724 | break; | |
725 | } | |
726 | ||
727 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
728 | } | |
729 | ||
730 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
731 | if (rt->rt6i_metric != metric) { | |
732 | cont = rt; | |
733 | break; | |
734 | } | |
735 | ||
afc154e9 | 736 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
737 | } |
738 | ||
739 | if (match || !cont) | |
740 | return match; | |
741 | ||
742 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 743 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 744 | |
f11e6659 DM |
745 | return match; |
746 | } | |
1da177e4 | 747 | |
f11e6659 DM |
748 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
749 | { | |
750 | struct rt6_info *match, *rt0; | |
8ed67789 | 751 | struct net *net; |
afc154e9 | 752 | bool do_rr = false; |
1da177e4 | 753 | |
f11e6659 DM |
754 | rt0 = fn->rr_ptr; |
755 | if (!rt0) | |
756 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 757 | |
afc154e9 HFS |
758 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
759 | &do_rr); | |
1da177e4 | 760 | |
afc154e9 | 761 | if (do_rr) { |
d8d1f30b | 762 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 763 | |
554cfb7e | 764 | /* no entries matched; do round-robin */ |
f11e6659 DM |
765 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
766 | next = fn->leaf; | |
767 | ||
768 | if (next != rt0) | |
769 | fn->rr_ptr = next; | |
1da177e4 | 770 | } |
1da177e4 | 771 | |
d1918542 | 772 | net = dev_net(rt0->dst.dev); |
a02cec21 | 773 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
774 | } |
775 | ||
8b9df265 MKL |
776 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
777 | { | |
778 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
779 | } | |
780 | ||
70ceb4f5 YH |
781 | #ifdef CONFIG_IPV6_ROUTE_INFO |
782 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 783 | const struct in6_addr *gwaddr) |
70ceb4f5 | 784 | { |
c346dca1 | 785 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
786 | struct route_info *rinfo = (struct route_info *) opt; |
787 | struct in6_addr prefix_buf, *prefix; | |
788 | unsigned int pref; | |
4bed72e4 | 789 | unsigned long lifetime; |
70ceb4f5 YH |
790 | struct rt6_info *rt; |
791 | ||
792 | if (len < sizeof(struct route_info)) { | |
793 | return -EINVAL; | |
794 | } | |
795 | ||
796 | /* Sanity check for prefix_len and length */ | |
797 | if (rinfo->length > 3) { | |
798 | return -EINVAL; | |
799 | } else if (rinfo->prefix_len > 128) { | |
800 | return -EINVAL; | |
801 | } else if (rinfo->prefix_len > 64) { | |
802 | if (rinfo->length < 2) { | |
803 | return -EINVAL; | |
804 | } | |
805 | } else if (rinfo->prefix_len > 0) { | |
806 | if (rinfo->length < 1) { | |
807 | return -EINVAL; | |
808 | } | |
809 | } | |
810 | ||
811 | pref = rinfo->route_pref; | |
812 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 813 | return -EINVAL; |
70ceb4f5 | 814 | |
4bed72e4 | 815 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
816 | |
817 | if (rinfo->length == 3) | |
818 | prefix = (struct in6_addr *)rinfo->prefix; | |
819 | else { | |
820 | /* this function is safe */ | |
821 | ipv6_addr_prefix(&prefix_buf, | |
822 | (struct in6_addr *)rinfo->prefix, | |
823 | rinfo->prefix_len); | |
824 | prefix = &prefix_buf; | |
825 | } | |
826 | ||
f104a567 DJ |
827 | if (rinfo->prefix_len == 0) |
828 | rt = rt6_get_dflt_router(gwaddr, dev); | |
829 | else | |
830 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 831 | gwaddr, dev); |
70ceb4f5 YH |
832 | |
833 | if (rt && !lifetime) { | |
e0a1ad73 | 834 | ip6_del_rt(rt); |
70ceb4f5 YH |
835 | rt = NULL; |
836 | } | |
837 | ||
838 | if (!rt && lifetime) | |
830218c1 DA |
839 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
840 | dev, pref); | |
70ceb4f5 YH |
841 | else if (rt) |
842 | rt->rt6i_flags = RTF_ROUTEINFO | | |
843 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
844 | ||
845 | if (rt) { | |
1716a961 G |
846 | if (!addrconf_finite_timeout(lifetime)) |
847 | rt6_clean_expires(rt); | |
848 | else | |
849 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
850 | ||
94e187c0 | 851 | ip6_rt_put(rt); |
70ceb4f5 YH |
852 | } |
853 | return 0; | |
854 | } | |
855 | #endif | |
856 | ||
a3c00e46 MKL |
857 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
858 | struct in6_addr *saddr) | |
859 | { | |
860 | struct fib6_node *pn; | |
861 | while (1) { | |
862 | if (fn->fn_flags & RTN_TL_ROOT) | |
863 | return NULL; | |
864 | pn = fn->parent; | |
865 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
866 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
867 | else | |
868 | fn = pn; | |
869 | if (fn->fn_flags & RTN_RTINFO) | |
870 | return fn; | |
871 | } | |
872 | } | |
c71099ac | 873 | |
8ed67789 DL |
874 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
875 | struct fib6_table *table, | |
4c9483b2 | 876 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
877 | { |
878 | struct fib6_node *fn; | |
879 | struct rt6_info *rt; | |
880 | ||
c71099ac | 881 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 882 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
883 | restart: |
884 | rt = fn->leaf; | |
4c9483b2 | 885 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 886 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 887 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
888 | if (rt == net->ipv6.ip6_null_entry) { |
889 | fn = fib6_backtrack(fn, &fl6->saddr); | |
890 | if (fn) | |
891 | goto restart; | |
892 | } | |
d8d1f30b | 893 | dst_use(&rt->dst, jiffies); |
c71099ac | 894 | read_unlock_bh(&table->tb6_lock); |
b811580d DA |
895 | |
896 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
897 | ||
c71099ac TG |
898 | return rt; |
899 | ||
900 | } | |
901 | ||
67ba4152 | 902 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
903 | int flags) |
904 | { | |
905 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
908 | ||
9acd9f3a YH |
909 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
910 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 911 | { |
4c9483b2 DM |
912 | struct flowi6 fl6 = { |
913 | .flowi6_oif = oif, | |
914 | .daddr = *daddr, | |
c71099ac TG |
915 | }; |
916 | struct dst_entry *dst; | |
77d16f45 | 917 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 918 | |
adaa70bb | 919 | if (saddr) { |
4c9483b2 | 920 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
921 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
922 | } | |
923 | ||
4c9483b2 | 924 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
925 | if (dst->error == 0) |
926 | return (struct rt6_info *) dst; | |
927 | ||
928 | dst_release(dst); | |
929 | ||
1da177e4 LT |
930 | return NULL; |
931 | } | |
7159039a YH |
932 | EXPORT_SYMBOL(rt6_lookup); |
933 | ||
c71099ac | 934 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
935 | It takes new route entry, the addition fails by any reason the |
936 | route is freed. In any case, if caller does not hold it, it may | |
937 | be destroyed. | |
938 | */ | |
939 | ||
e5fd387a | 940 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
333c4301 DA |
941 | struct mx6_config *mxc, |
942 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
943 | { |
944 | int err; | |
c71099ac | 945 | struct fib6_table *table; |
1da177e4 | 946 | |
c71099ac TG |
947 | table = rt->rt6i_table; |
948 | write_lock_bh(&table->tb6_lock); | |
333c4301 | 949 | err = fib6_add(&table->tb6_root, rt, info, mxc, extack); |
c71099ac | 950 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
951 | |
952 | return err; | |
953 | } | |
954 | ||
40e22e8f TG |
955 | int ip6_ins_rt(struct rt6_info *rt) |
956 | { | |
e715b6d3 FW |
957 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
958 | struct mx6_config mxc = { .mx = NULL, }; | |
959 | ||
333c4301 | 960 | return __ip6_ins_rt(rt, &info, &mxc, NULL); |
40e22e8f TG |
961 | } |
962 | ||
8b9df265 MKL |
963 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
964 | const struct in6_addr *daddr, | |
965 | const struct in6_addr *saddr) | |
1da177e4 | 966 | { |
1da177e4 LT |
967 | struct rt6_info *rt; |
968 | ||
969 | /* | |
970 | * Clone the route. | |
971 | */ | |
972 | ||
d52d3997 | 973 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 974 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 975 | |
ad706862 | 976 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
977 | |
978 | if (!rt) | |
979 | return NULL; | |
980 | ||
981 | ip6_rt_copy_init(rt, ort); | |
982 | rt->rt6i_flags |= RTF_CACHE; | |
983 | rt->rt6i_metric = 0; | |
984 | rt->dst.flags |= DST_HOST; | |
985 | rt->rt6i_dst.addr = *daddr; | |
986 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 987 | |
83a09abd MKL |
988 | if (!rt6_is_gw_or_nonexthop(ort)) { |
989 | if (ort->rt6i_dst.plen != 128 && | |
990 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
991 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 992 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
993 | if (rt->rt6i_src.plen && saddr) { |
994 | rt->rt6i_src.addr = *saddr; | |
995 | rt->rt6i_src.plen = 128; | |
8b9df265 | 996 | } |
83a09abd | 997 | #endif |
95a9a5ba | 998 | } |
1da177e4 | 999 | |
95a9a5ba YH |
1000 | return rt; |
1001 | } | |
1da177e4 | 1002 | |
d52d3997 MKL |
1003 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
1004 | { | |
1005 | struct rt6_info *pcpu_rt; | |
1006 | ||
1007 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 1008 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
1009 | |
1010 | if (!pcpu_rt) | |
1011 | return NULL; | |
1012 | ip6_rt_copy_init(pcpu_rt, rt); | |
1013 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
1014 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
1015 | return pcpu_rt; | |
1016 | } | |
1017 | ||
1018 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
1019 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
1020 | { | |
a73e4195 | 1021 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
1022 | |
1023 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1024 | pcpu_rt = *p; | |
1025 | ||
a73e4195 MKL |
1026 | if (pcpu_rt) { |
1027 | dst_hold(&pcpu_rt->dst); | |
1028 | rt6_dst_from_metrics_check(pcpu_rt); | |
1029 | } | |
1030 | return pcpu_rt; | |
1031 | } | |
1032 | ||
1033 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1034 | { | |
9c7370a1 | 1035 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 1036 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
1037 | |
1038 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1039 | if (!pcpu_rt) { | |
1040 | struct net *net = dev_net(rt->dst.dev); | |
1041 | ||
9c7370a1 MKL |
1042 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1043 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1044 | } |
1045 | ||
9c7370a1 MKL |
1046 | read_lock_bh(&table->tb6_lock); |
1047 | if (rt->rt6i_pcpu) { | |
1048 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1049 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1050 | if (prev) { | |
1051 | /* If someone did it before us, return prev instead */ | |
1052 | dst_destroy(&pcpu_rt->dst); | |
1053 | pcpu_rt = prev; | |
1054 | } | |
1055 | } else { | |
1056 | /* rt has been removed from the fib6 tree | |
1057 | * before we have a chance to acquire the read_lock. | |
1058 | * In this case, don't brother to create a pcpu rt | |
1059 | * since rt is going away anyway. The next | |
1060 | * dst_check() will trigger a re-lookup. | |
1061 | */ | |
d52d3997 | 1062 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1063 | pcpu_rt = rt; |
d52d3997 | 1064 | } |
d52d3997 MKL |
1065 | dst_hold(&pcpu_rt->dst); |
1066 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1067 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1068 | return pcpu_rt; |
1069 | } | |
1070 | ||
9ff74384 DA |
1071 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
1072 | int oif, struct flowi6 *fl6, int flags) | |
1da177e4 | 1073 | { |
367efcb9 | 1074 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1075 | struct rt6_info *rt; |
c71099ac | 1076 | int strict = 0; |
1da177e4 | 1077 | |
77d16f45 | 1078 | strict |= flags & RT6_LOOKUP_F_IFACE; |
d5d32e4b | 1079 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; |
367efcb9 MKL |
1080 | if (net->ipv6.devconf_all->forwarding == 0) |
1081 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1082 | |
c71099ac | 1083 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1084 | |
4c9483b2 | 1085 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1086 | saved_fn = fn; |
1da177e4 | 1087 | |
ca254490 DA |
1088 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1089 | oif = 0; | |
1090 | ||
a3c00e46 | 1091 | redo_rt6_select: |
367efcb9 | 1092 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1093 | if (rt->rt6i_nsiblings) |
367efcb9 | 1094 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1095 | if (rt == net->ipv6.ip6_null_entry) { |
1096 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1097 | if (fn) | |
1098 | goto redo_rt6_select; | |
367efcb9 MKL |
1099 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1100 | /* also consider unreachable route */ | |
1101 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1102 | fn = saved_fn; | |
1103 | goto redo_rt6_select; | |
367efcb9 | 1104 | } |
a3c00e46 MKL |
1105 | } |
1106 | ||
fb9de91e | 1107 | |
3da59bd9 | 1108 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1109 | dst_use(&rt->dst, jiffies); |
1110 | read_unlock_bh(&table->tb6_lock); | |
1111 | ||
1112 | rt6_dst_from_metrics_check(rt); | |
b811580d DA |
1113 | |
1114 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
d52d3997 | 1115 | return rt; |
3da59bd9 MKL |
1116 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1117 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1118 | /* Create a RTF_CACHE clone which will not be | |
1119 | * owned by the fib6 tree. It is for the special case where | |
1120 | * the daddr in the skb during the neighbor look-up is different | |
1121 | * from the fl6->daddr used to look-up route here. | |
1122 | */ | |
1123 | ||
1124 | struct rt6_info *uncached_rt; | |
1125 | ||
d52d3997 MKL |
1126 | dst_use(&rt->dst, jiffies); |
1127 | read_unlock_bh(&table->tb6_lock); | |
1128 | ||
3da59bd9 MKL |
1129 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1130 | dst_release(&rt->dst); | |
c71099ac | 1131 | |
3da59bd9 | 1132 | if (uncached_rt) |
8d0b94af | 1133 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1134 | else |
1135 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1136 | |
3da59bd9 | 1137 | dst_hold(&uncached_rt->dst); |
b811580d DA |
1138 | |
1139 | trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6); | |
3da59bd9 | 1140 | return uncached_rt; |
3da59bd9 | 1141 | |
d52d3997 MKL |
1142 | } else { |
1143 | /* Get a percpu copy */ | |
1144 | ||
1145 | struct rt6_info *pcpu_rt; | |
1146 | ||
1147 | rt->dst.lastuse = jiffies; | |
1148 | rt->dst.__use++; | |
1149 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1150 | |
9c7370a1 MKL |
1151 | if (pcpu_rt) { |
1152 | read_unlock_bh(&table->tb6_lock); | |
1153 | } else { | |
1154 | /* We have to do the read_unlock first | |
1155 | * because rt6_make_pcpu_route() may trigger | |
1156 | * ip6_dst_gc() which will take the write_lock. | |
1157 | */ | |
1158 | dst_hold(&rt->dst); | |
1159 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1160 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1161 | dst_release(&rt->dst); |
1162 | } | |
d52d3997 | 1163 | |
b811580d | 1164 | trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6); |
d52d3997 | 1165 | return pcpu_rt; |
9c7370a1 | 1166 | |
d52d3997 | 1167 | } |
1da177e4 | 1168 | } |
9ff74384 | 1169 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 1170 | |
8ed67789 | 1171 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1172 | struct flowi6 *fl6, int flags) |
4acad72d | 1173 | { |
4c9483b2 | 1174 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1175 | } |
1176 | ||
d409b847 MB |
1177 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
1178 | struct net_device *dev, | |
1179 | struct flowi6 *fl6, int flags) | |
72331bc0 SL |
1180 | { |
1181 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1182 | flags |= RT6_LOOKUP_F_IFACE; | |
1183 | ||
1184 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1185 | } | |
d409b847 | 1186 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 1187 | |
c71099ac TG |
1188 | void ip6_route_input(struct sk_buff *skb) |
1189 | { | |
b71d1d42 | 1190 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1191 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1192 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1193 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1194 | struct flowi6 fl6 = { |
e0d56fdd | 1195 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
1196 | .daddr = iph->daddr, |
1197 | .saddr = iph->saddr, | |
6502ca52 | 1198 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1199 | .flowi6_mark = skb->mark, |
1200 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1201 | }; |
adaa70bb | 1202 | |
904af04d | 1203 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1204 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1205 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1206 | skb_dst_drop(skb); |
72331bc0 | 1207 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1208 | } |
1209 | ||
8ed67789 | 1210 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1211 | struct flowi6 *fl6, int flags) |
1da177e4 | 1212 | { |
4c9483b2 | 1213 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1214 | } |
1215 | ||
6f21c96a PA |
1216 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
1217 | struct flowi6 *fl6, int flags) | |
c71099ac | 1218 | { |
d46a9d67 | 1219 | bool any_src; |
c71099ac | 1220 | |
4c1feac5 DA |
1221 | if (rt6_need_strict(&fl6->daddr)) { |
1222 | struct dst_entry *dst; | |
1223 | ||
1224 | dst = l3mdev_link_scope_lookup(net, fl6); | |
1225 | if (dst) | |
1226 | return dst; | |
1227 | } | |
ca254490 | 1228 | |
1fb9489b | 1229 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1230 | |
d46a9d67 | 1231 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1232 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1233 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1234 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1235 | |
d46a9d67 | 1236 | if (!any_src) |
adaa70bb | 1237 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1238 | else if (sk) |
1239 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1240 | |
4c9483b2 | 1241 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1242 | } |
6f21c96a | 1243 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 1244 | |
2774c131 | 1245 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1246 | { |
5c1e6aa3 | 1247 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1248 | struct dst_entry *new = NULL; |
1249 | ||
f5b0a874 | 1250 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1251 | if (rt) { |
0a1f5962 | 1252 | rt6_info_init(rt); |
8104891b | 1253 | |
0a1f5962 | 1254 | new = &rt->dst; |
14e50e57 | 1255 | new->__use = 1; |
352e512c | 1256 | new->input = dst_discard; |
ede2059d | 1257 | new->output = dst_discard_out; |
14e50e57 | 1258 | |
0a1f5962 | 1259 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
1260 | rt->rt6i_idev = ort->rt6i_idev; |
1261 | if (rt->rt6i_idev) | |
1262 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1263 | |
4e3fd7a0 | 1264 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1265 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1266 | rt->rt6i_metric = 0; |
1267 | ||
1268 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1269 | #ifdef CONFIG_IPV6_SUBTREES | |
1270 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1271 | #endif | |
1272 | ||
1273 | dst_free(new); | |
1274 | } | |
1275 | ||
69ead7af DM |
1276 | dst_release(dst_orig); |
1277 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1278 | } |
14e50e57 | 1279 | |
1da177e4 LT |
1280 | /* |
1281 | * Destination cache support functions | |
1282 | */ | |
1283 | ||
4b32b5ad MKL |
1284 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1285 | { | |
1286 | if (rt->dst.from && | |
1287 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1288 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1289 | } | |
1290 | ||
3da59bd9 MKL |
1291 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1292 | { | |
1293 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1294 | return NULL; | |
1295 | ||
1296 | if (rt6_check_expired(rt)) | |
1297 | return NULL; | |
1298 | ||
1299 | return &rt->dst; | |
1300 | } | |
1301 | ||
1302 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1303 | { | |
5973fb1e MKL |
1304 | if (!__rt6_check_expired(rt) && |
1305 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3da59bd9 MKL |
1306 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) |
1307 | return &rt->dst; | |
1308 | else | |
1309 | return NULL; | |
1310 | } | |
1311 | ||
1da177e4 LT |
1312 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1313 | { | |
1314 | struct rt6_info *rt; | |
1315 | ||
1316 | rt = (struct rt6_info *) dst; | |
1317 | ||
6f3118b5 ND |
1318 | /* All IPV6 dsts are created with ->obsolete set to the value |
1319 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1320 | * into this function always. | |
1321 | */ | |
e3bc10bd | 1322 | |
4b32b5ad MKL |
1323 | rt6_dst_from_metrics_check(rt); |
1324 | ||
02bcf4e0 MKL |
1325 | if (rt->rt6i_flags & RTF_PCPU || |
1326 | (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from)) | |
3da59bd9 MKL |
1327 | return rt6_dst_from_check(rt, cookie); |
1328 | else | |
1329 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1330 | } |
1331 | ||
1332 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1333 | { | |
1334 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1335 | ||
1336 | if (rt) { | |
54c1a859 YH |
1337 | if (rt->rt6i_flags & RTF_CACHE) { |
1338 | if (rt6_check_expired(rt)) { | |
1339 | ip6_del_rt(rt); | |
1340 | dst = NULL; | |
1341 | } | |
1342 | } else { | |
1da177e4 | 1343 | dst_release(dst); |
54c1a859 YH |
1344 | dst = NULL; |
1345 | } | |
1da177e4 | 1346 | } |
54c1a859 | 1347 | return dst; |
1da177e4 LT |
1348 | } |
1349 | ||
1350 | static void ip6_link_failure(struct sk_buff *skb) | |
1351 | { | |
1352 | struct rt6_info *rt; | |
1353 | ||
3ffe533c | 1354 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1355 | |
adf30907 | 1356 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1357 | if (rt) { |
1eb4f758 HFS |
1358 | if (rt->rt6i_flags & RTF_CACHE) { |
1359 | dst_hold(&rt->dst); | |
8e3d5be7 | 1360 | ip6_del_rt(rt); |
1eb4f758 | 1361 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1362 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1363 | } |
1da177e4 LT |
1364 | } |
1365 | } | |
1366 | ||
45e4fd26 MKL |
1367 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1368 | { | |
1369 | struct net *net = dev_net(rt->dst.dev); | |
1370 | ||
1371 | rt->rt6i_flags |= RTF_MODIFIED; | |
1372 | rt->rt6i_pmtu = mtu; | |
1373 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1374 | } | |
1375 | ||
0d3f6d29 MKL |
1376 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
1377 | { | |
1378 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1379 | (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node); | |
1380 | } | |
1381 | ||
45e4fd26 MKL |
1382 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
1383 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1384 | { |
0dec879f | 1385 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 1386 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1387 | |
45e4fd26 MKL |
1388 | if (rt6->rt6i_flags & RTF_LOCAL) |
1389 | return; | |
81aded24 | 1390 | |
19bda36c XL |
1391 | if (dst_metric_locked(dst, RTAX_MTU)) |
1392 | return; | |
1393 | ||
0dec879f JA |
1394 | if (iph) { |
1395 | daddr = &iph->daddr; | |
1396 | saddr = &iph->saddr; | |
1397 | } else if (sk) { | |
1398 | daddr = &sk->sk_v6_daddr; | |
1399 | saddr = &inet6_sk(sk)->saddr; | |
1400 | } else { | |
1401 | daddr = NULL; | |
1402 | saddr = NULL; | |
1403 | } | |
1404 | dst_confirm_neigh(dst, daddr); | |
45e4fd26 MKL |
1405 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
1406 | if (mtu >= dst_mtu(dst)) | |
1407 | return; | |
9d289715 | 1408 | |
0d3f6d29 | 1409 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 1410 | rt6_do_update_pmtu(rt6, mtu); |
0dec879f | 1411 | } else if (daddr) { |
45e4fd26 MKL |
1412 | struct rt6_info *nrt6; |
1413 | ||
45e4fd26 MKL |
1414 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); |
1415 | if (nrt6) { | |
1416 | rt6_do_update_pmtu(nrt6, mtu); | |
1417 | ||
1418 | /* ip6_ins_rt(nrt6) will bump the | |
1419 | * rt6->rt6i_node->fn_sernum | |
1420 | * which will fail the next rt6_check() and | |
1421 | * invalidate the sk->sk_dst_cache. | |
1422 | */ | |
1423 | ip6_ins_rt(nrt6); | |
1424 | } | |
1da177e4 LT |
1425 | } |
1426 | } | |
1427 | ||
45e4fd26 MKL |
1428 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1429 | struct sk_buff *skb, u32 mtu) | |
1430 | { | |
1431 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1432 | } | |
1433 | ||
42ae66c8 | 1434 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 1435 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
1436 | { |
1437 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1438 | struct dst_entry *dst; | |
1439 | struct flowi6 fl6; | |
1440 | ||
1441 | memset(&fl6, 0, sizeof(fl6)); | |
1442 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1443 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1444 | fl6.daddr = iph->daddr; |
1445 | fl6.saddr = iph->saddr; | |
6502ca52 | 1446 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 1447 | fl6.flowi6_uid = uid; |
81aded24 DM |
1448 | |
1449 | dst = ip6_route_output(net, NULL, &fl6); | |
1450 | if (!dst->error) | |
45e4fd26 | 1451 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1452 | dst_release(dst); |
1453 | } | |
1454 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1455 | ||
1456 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1457 | { | |
33c162a9 MKL |
1458 | struct dst_entry *dst; |
1459 | ||
81aded24 | 1460 | ip6_update_pmtu(skb, sock_net(sk), mtu, |
e2d118a1 | 1461 | sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid); |
33c162a9 MKL |
1462 | |
1463 | dst = __sk_dst_get(sk); | |
1464 | if (!dst || !dst->obsolete || | |
1465 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
1466 | return; | |
1467 | ||
1468 | bh_lock_sock(sk); | |
1469 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
1470 | ip6_datagram_dst_update(sk, false); | |
1471 | bh_unlock_sock(sk); | |
81aded24 DM |
1472 | } |
1473 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1474 | ||
b55b76b2 DJ |
1475 | /* Handle redirects */ |
1476 | struct ip6rd_flowi { | |
1477 | struct flowi6 fl6; | |
1478 | struct in6_addr gateway; | |
1479 | }; | |
1480 | ||
1481 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1482 | struct fib6_table *table, | |
1483 | struct flowi6 *fl6, | |
1484 | int flags) | |
1485 | { | |
1486 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1487 | struct rt6_info *rt; | |
1488 | struct fib6_node *fn; | |
1489 | ||
1490 | /* Get the "current" route for this destination and | |
67c408cf | 1491 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
1492 | * |
1493 | * RFC 4861 specifies that redirects should only be | |
1494 | * accepted if they come from the nexthop to the target. | |
1495 | * Due to the way the routes are chosen, this notion | |
1496 | * is a bit fuzzy and one might need to check all possible | |
1497 | * routes. | |
1498 | */ | |
1499 | ||
1500 | read_lock_bh(&table->tb6_lock); | |
1501 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1502 | restart: | |
1503 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1504 | if (rt6_check_expired(rt)) | |
1505 | continue; | |
1506 | if (rt->dst.error) | |
1507 | break; | |
1508 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1509 | continue; | |
1510 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1511 | continue; | |
1512 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1513 | continue; | |
1514 | break; | |
1515 | } | |
1516 | ||
1517 | if (!rt) | |
1518 | rt = net->ipv6.ip6_null_entry; | |
1519 | else if (rt->dst.error) { | |
1520 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1521 | goto out; |
1522 | } | |
1523 | ||
1524 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1525 | fn = fib6_backtrack(fn, &fl6->saddr); |
1526 | if (fn) | |
1527 | goto restart; | |
b55b76b2 | 1528 | } |
a3c00e46 | 1529 | |
b0a1ba59 | 1530 | out: |
b55b76b2 DJ |
1531 | dst_hold(&rt->dst); |
1532 | ||
1533 | read_unlock_bh(&table->tb6_lock); | |
1534 | ||
b811580d | 1535 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); |
b55b76b2 DJ |
1536 | return rt; |
1537 | }; | |
1538 | ||
1539 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1540 | const struct flowi6 *fl6, | |
1541 | const struct in6_addr *gateway) | |
1542 | { | |
1543 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1544 | struct ip6rd_flowi rdfl; | |
1545 | ||
1546 | rdfl.fl6 = *fl6; | |
1547 | rdfl.gateway = *gateway; | |
1548 | ||
1549 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1550 | flags, __ip6_route_redirect); | |
1551 | } | |
1552 | ||
e2d118a1 LC |
1553 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
1554 | kuid_t uid) | |
3a5ad2ee DM |
1555 | { |
1556 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1557 | struct dst_entry *dst; | |
1558 | struct flowi6 fl6; | |
1559 | ||
1560 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1561 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1562 | fl6.flowi6_oif = oif; |
1563 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1564 | fl6.daddr = iph->daddr; |
1565 | fl6.saddr = iph->saddr; | |
6502ca52 | 1566 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 1567 | fl6.flowi6_uid = uid; |
3a5ad2ee | 1568 | |
b55b76b2 DJ |
1569 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1570 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1571 | dst_release(dst); |
1572 | } | |
1573 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1574 | ||
c92a59ec DJ |
1575 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1576 | u32 mark) | |
1577 | { | |
1578 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1579 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1580 | struct dst_entry *dst; | |
1581 | struct flowi6 fl6; | |
1582 | ||
1583 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1584 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1585 | fl6.flowi6_oif = oif; |
1586 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1587 | fl6.daddr = msg->dest; |
1588 | fl6.saddr = iph->daddr; | |
e2d118a1 | 1589 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
c92a59ec | 1590 | |
b55b76b2 DJ |
1591 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1592 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1593 | dst_release(dst); |
1594 | } | |
1595 | ||
3a5ad2ee DM |
1596 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1597 | { | |
e2d118a1 LC |
1598 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
1599 | sk->sk_uid); | |
3a5ad2ee DM |
1600 | } |
1601 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1602 | ||
0dbaee3b | 1603 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1604 | { |
0dbaee3b DM |
1605 | struct net_device *dev = dst->dev; |
1606 | unsigned int mtu = dst_mtu(dst); | |
1607 | struct net *net = dev_net(dev); | |
1608 | ||
1da177e4 LT |
1609 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1610 | ||
5578689a DL |
1611 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1612 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1613 | |
1614 | /* | |
1ab1457c YH |
1615 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1616 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1617 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1618 | * rely only on pmtu discovery" |
1619 | */ | |
1620 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1621 | mtu = IPV6_MAXPLEN; | |
1622 | return mtu; | |
1623 | } | |
1624 | ||
ebb762f2 | 1625 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1626 | { |
4b32b5ad MKL |
1627 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1628 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1629 | struct inet6_dev *idev; |
618f9bc7 | 1630 | |
4b32b5ad MKL |
1631 | if (mtu) |
1632 | goto out; | |
1633 | ||
1634 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1635 | if (mtu) |
30f78d8e | 1636 | goto out; |
618f9bc7 SK |
1637 | |
1638 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1639 | |
1640 | rcu_read_lock(); | |
1641 | idev = __in6_dev_get(dst->dev); | |
1642 | if (idev) | |
1643 | mtu = idev->cnf.mtu6; | |
1644 | rcu_read_unlock(); | |
1645 | ||
30f78d8e | 1646 | out: |
14972cbd RP |
1647 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1648 | ||
1649 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1650 | } |
1651 | ||
3b00944c YH |
1652 | static struct dst_entry *icmp6_dst_gc_list; |
1653 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1654 | |
3b00944c | 1655 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1656 | struct flowi6 *fl6) |
1da177e4 | 1657 | { |
87a11578 | 1658 | struct dst_entry *dst; |
1da177e4 LT |
1659 | struct rt6_info *rt; |
1660 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1661 | struct net *net = dev_net(dev); |
1da177e4 | 1662 | |
38308473 | 1663 | if (unlikely(!idev)) |
122bdf67 | 1664 | return ERR_PTR(-ENODEV); |
1da177e4 | 1665 | |
ad706862 | 1666 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 1667 | if (unlikely(!rt)) { |
1da177e4 | 1668 | in6_dev_put(idev); |
87a11578 | 1669 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1670 | goto out; |
1671 | } | |
1672 | ||
8e2ec639 YZ |
1673 | rt->dst.flags |= DST_HOST; |
1674 | rt->dst.output = ip6_output; | |
d8d1f30b | 1675 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1676 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1677 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1678 | rt->rt6i_dst.plen = 128; |
1679 | rt->rt6i_idev = idev; | |
14edd87d | 1680 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1681 | |
3b00944c | 1682 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1683 | rt->dst.next = icmp6_dst_gc_list; |
1684 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1685 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1686 | |
5578689a | 1687 | fib6_force_start_gc(net); |
1da177e4 | 1688 | |
87a11578 DM |
1689 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1690 | ||
1da177e4 | 1691 | out: |
87a11578 | 1692 | return dst; |
1da177e4 LT |
1693 | } |
1694 | ||
3d0f24a7 | 1695 | int icmp6_dst_gc(void) |
1da177e4 | 1696 | { |
e9476e95 | 1697 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1698 | int more = 0; |
1da177e4 | 1699 | |
3b00944c YH |
1700 | spin_lock_bh(&icmp6_dst_lock); |
1701 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1702 | |
1da177e4 LT |
1703 | while ((dst = *pprev) != NULL) { |
1704 | if (!atomic_read(&dst->__refcnt)) { | |
1705 | *pprev = dst->next; | |
1706 | dst_free(dst); | |
1da177e4 LT |
1707 | } else { |
1708 | pprev = &dst->next; | |
3d0f24a7 | 1709 | ++more; |
1da177e4 LT |
1710 | } |
1711 | } | |
1712 | ||
3b00944c | 1713 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1714 | |
3d0f24a7 | 1715 | return more; |
1da177e4 LT |
1716 | } |
1717 | ||
1e493d19 DM |
1718 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1719 | void *arg) | |
1720 | { | |
1721 | struct dst_entry *dst, **pprev; | |
1722 | ||
1723 | spin_lock_bh(&icmp6_dst_lock); | |
1724 | pprev = &icmp6_dst_gc_list; | |
1725 | while ((dst = *pprev) != NULL) { | |
1726 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1727 | if (func(rt, arg)) { | |
1728 | *pprev = dst->next; | |
1729 | dst_free(dst); | |
1730 | } else { | |
1731 | pprev = &dst->next; | |
1732 | } | |
1733 | } | |
1734 | spin_unlock_bh(&icmp6_dst_lock); | |
1735 | } | |
1736 | ||
569d3645 | 1737 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1738 | { |
86393e52 | 1739 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1740 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1741 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1742 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1743 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1744 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1745 | int entries; |
7019b78e | 1746 | |
fc66f95c | 1747 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1748 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1749 | entries <= rt_max_size) |
1da177e4 LT |
1750 | goto out; |
1751 | ||
6891a346 | 1752 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1753 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1754 | entries = dst_entries_get_slow(ops); |
1755 | if (entries < ops->gc_thresh) | |
7019b78e | 1756 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1757 | out: |
7019b78e | 1758 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1759 | return entries > rt_max_size; |
1da177e4 LT |
1760 | } |
1761 | ||
e715b6d3 FW |
1762 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1763 | const struct fib6_config *cfg) | |
1764 | { | |
c3a8d947 | 1765 | bool ecn_ca = false; |
e715b6d3 FW |
1766 | struct nlattr *nla; |
1767 | int remaining; | |
1768 | u32 *mp; | |
1769 | ||
63159f29 | 1770 | if (!cfg->fc_mx) |
e715b6d3 FW |
1771 | return 0; |
1772 | ||
1773 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1774 | if (unlikely(!mp)) | |
1775 | return -ENOMEM; | |
1776 | ||
1777 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1778 | int type = nla_type(nla); | |
1bb14807 | 1779 | u32 val; |
e715b6d3 | 1780 | |
1bb14807 DB |
1781 | if (!type) |
1782 | continue; | |
1783 | if (unlikely(type > RTAX_MAX)) | |
1784 | goto err; | |
ea697639 | 1785 | |
1bb14807 DB |
1786 | if (type == RTAX_CC_ALGO) { |
1787 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 1788 | |
1bb14807 | 1789 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
c3a8d947 | 1790 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
1bb14807 DB |
1791 | if (val == TCP_CA_UNSPEC) |
1792 | goto err; | |
1793 | } else { | |
1794 | val = nla_get_u32(nla); | |
e715b6d3 | 1795 | } |
626abd59 PA |
1796 | if (type == RTAX_HOPLIMIT && val > 255) |
1797 | val = 255; | |
b8d3e416 DB |
1798 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1799 | goto err; | |
1bb14807 DB |
1800 | |
1801 | mp[type - 1] = val; | |
1802 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
1803 | } |
1804 | ||
c3a8d947 DB |
1805 | if (ecn_ca) { |
1806 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
1807 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
1808 | } | |
e715b6d3 | 1809 | |
c3a8d947 | 1810 | mxc->mx = mp; |
e715b6d3 FW |
1811 | return 0; |
1812 | err: | |
1813 | kfree(mp); | |
1814 | return -EINVAL; | |
1815 | } | |
1da177e4 | 1816 | |
8c14586f DA |
1817 | static struct rt6_info *ip6_nh_lookup_table(struct net *net, |
1818 | struct fib6_config *cfg, | |
1819 | const struct in6_addr *gw_addr) | |
1820 | { | |
1821 | struct flowi6 fl6 = { | |
1822 | .flowi6_oif = cfg->fc_ifindex, | |
1823 | .daddr = *gw_addr, | |
1824 | .saddr = cfg->fc_prefsrc, | |
1825 | }; | |
1826 | struct fib6_table *table; | |
1827 | struct rt6_info *rt; | |
d5d32e4b | 1828 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f DA |
1829 | |
1830 | table = fib6_get_table(net, cfg->fc_table); | |
1831 | if (!table) | |
1832 | return NULL; | |
1833 | ||
1834 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
1835 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1836 | ||
1837 | rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags); | |
1838 | ||
1839 | /* if table lookup failed, fall back to full lookup */ | |
1840 | if (rt == net->ipv6.ip6_null_entry) { | |
1841 | ip6_rt_put(rt); | |
1842 | rt = NULL; | |
1843 | } | |
1844 | ||
1845 | return rt; | |
1846 | } | |
1847 | ||
333c4301 DA |
1848 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg, |
1849 | struct netlink_ext_ack *extack) | |
1da177e4 | 1850 | { |
5578689a | 1851 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1852 | struct rt6_info *rt = NULL; |
1853 | struct net_device *dev = NULL; | |
1854 | struct inet6_dev *idev = NULL; | |
c71099ac | 1855 | struct fib6_table *table; |
1da177e4 | 1856 | int addr_type; |
8c5b83f0 | 1857 | int err = -EINVAL; |
1da177e4 | 1858 | |
557c44be | 1859 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
1860 | if (cfg->fc_flags & RTF_PCPU) { |
1861 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 1862 | goto out; |
d5d531cb | 1863 | } |
557c44be | 1864 | |
d5d531cb DA |
1865 | if (cfg->fc_dst_len > 128) { |
1866 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
1867 | goto out; | |
1868 | } | |
1869 | if (cfg->fc_src_len > 128) { | |
1870 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 1871 | goto out; |
d5d531cb | 1872 | } |
1da177e4 | 1873 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
1874 | if (cfg->fc_src_len) { |
1875 | NL_SET_ERR_MSG(extack, | |
1876 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 1877 | goto out; |
d5d531cb | 1878 | } |
1da177e4 | 1879 | #endif |
86872cb5 | 1880 | if (cfg->fc_ifindex) { |
1da177e4 | 1881 | err = -ENODEV; |
5578689a | 1882 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1883 | if (!dev) |
1884 | goto out; | |
1885 | idev = in6_dev_get(dev); | |
1886 | if (!idev) | |
1887 | goto out; | |
1888 | } | |
1889 | ||
86872cb5 TG |
1890 | if (cfg->fc_metric == 0) |
1891 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1892 | |
d71314b4 | 1893 | err = -ENOBUFS; |
38308473 DM |
1894 | if (cfg->fc_nlinfo.nlh && |
1895 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1896 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1897 | if (!table) { |
f3213831 | 1898 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1899 | table = fib6_new_table(net, cfg->fc_table); |
1900 | } | |
1901 | } else { | |
1902 | table = fib6_new_table(net, cfg->fc_table); | |
1903 | } | |
38308473 DM |
1904 | |
1905 | if (!table) | |
c71099ac | 1906 | goto out; |
c71099ac | 1907 | |
ad706862 MKL |
1908 | rt = ip6_dst_alloc(net, NULL, |
1909 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 1910 | |
38308473 | 1911 | if (!rt) { |
1da177e4 LT |
1912 | err = -ENOMEM; |
1913 | goto out; | |
1914 | } | |
1915 | ||
1716a961 G |
1916 | if (cfg->fc_flags & RTF_EXPIRES) |
1917 | rt6_set_expires(rt, jiffies + | |
1918 | clock_t_to_jiffies(cfg->fc_expires)); | |
1919 | else | |
1920 | rt6_clean_expires(rt); | |
1da177e4 | 1921 | |
86872cb5 TG |
1922 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1923 | cfg->fc_protocol = RTPROT_BOOT; | |
1924 | rt->rt6i_protocol = cfg->fc_protocol; | |
1925 | ||
1926 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1927 | |
1928 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1929 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1930 | else if (cfg->fc_flags & RTF_LOCAL) |
1931 | rt->dst.input = ip6_input; | |
1da177e4 | 1932 | else |
d8d1f30b | 1933 | rt->dst.input = ip6_forward; |
1da177e4 | 1934 | |
d8d1f30b | 1935 | rt->dst.output = ip6_output; |
1da177e4 | 1936 | |
19e42e45 RP |
1937 | if (cfg->fc_encap) { |
1938 | struct lwtunnel_state *lwtstate; | |
1939 | ||
30357d7d | 1940 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd TH |
1941 | cfg->fc_encap, AF_INET6, cfg, |
1942 | &lwtstate); | |
19e42e45 RP |
1943 | if (err) |
1944 | goto out; | |
61adedf3 JB |
1945 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
1946 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
1947 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
1948 | rt->dst.output = lwtunnel_output; | |
25368623 | 1949 | } |
61adedf3 JB |
1950 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
1951 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
1952 | rt->dst.input = lwtunnel_input; | |
25368623 | 1953 | } |
19e42e45 RP |
1954 | } |
1955 | ||
86872cb5 TG |
1956 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1957 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1958 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1959 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1960 | |
1da177e4 | 1961 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1962 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1963 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1964 | #endif |
1965 | ||
86872cb5 | 1966 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1967 | |
1968 | /* We cannot add true routes via loopback here, | |
1969 | they would result in kernel looping; promote them to reject routes | |
1970 | */ | |
86872cb5 | 1971 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1972 | (dev && (dev->flags & IFF_LOOPBACK) && |
1973 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1974 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1975 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1976 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1977 | if (dev) { |
1978 | dev_put(dev); | |
1979 | in6_dev_put(idev); | |
1980 | } | |
5578689a | 1981 | dev = net->loopback_dev; |
1da177e4 LT |
1982 | dev_hold(dev); |
1983 | idev = in6_dev_get(dev); | |
1984 | if (!idev) { | |
1985 | err = -ENODEV; | |
1986 | goto out; | |
1987 | } | |
1988 | } | |
1da177e4 | 1989 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1990 | switch (cfg->fc_type) { |
1991 | case RTN_BLACKHOLE: | |
1992 | rt->dst.error = -EINVAL; | |
ede2059d | 1993 | rt->dst.output = dst_discard_out; |
7150aede | 1994 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1995 | break; |
1996 | case RTN_PROHIBIT: | |
1997 | rt->dst.error = -EACCES; | |
7150aede K |
1998 | rt->dst.output = ip6_pkt_prohibit_out; |
1999 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 2000 | break; |
b4949ab2 | 2001 | case RTN_THROW: |
0315e382 | 2002 | case RTN_UNREACHABLE: |
ef2c7d7b | 2003 | default: |
7150aede | 2004 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
2005 | : (cfg->fc_type == RTN_UNREACHABLE) |
2006 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
2007 | rt->dst.output = ip6_pkt_discard_out; |
2008 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
2009 | break; |
2010 | } | |
1da177e4 LT |
2011 | goto install_route; |
2012 | } | |
2013 | ||
86872cb5 | 2014 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 2015 | const struct in6_addr *gw_addr; |
1da177e4 LT |
2016 | int gwa_type; |
2017 | ||
86872cb5 | 2018 | gw_addr = &cfg->fc_gateway; |
330567b7 | 2019 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
2020 | |
2021 | /* if gw_addr is local we will fail to detect this in case | |
2022 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
2023 | * will return already-added prefix route via interface that | |
2024 | * prefix route was assigned to, which might be non-loopback. | |
2025 | */ | |
2026 | err = -EINVAL; | |
330567b7 FW |
2027 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
2028 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
d5d531cb DA |
2029 | dev : NULL, 0, 0)) { |
2030 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
48ed7b26 | 2031 | goto out; |
d5d531cb | 2032 | } |
4e3fd7a0 | 2033 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
2034 | |
2035 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
8c14586f | 2036 | struct rt6_info *grt = NULL; |
1da177e4 LT |
2037 | |
2038 | /* IPv6 strictly inhibits using not link-local | |
2039 | addresses as nexthop address. | |
2040 | Otherwise, router will not able to send redirects. | |
2041 | It is very good, but in some (rare!) circumstances | |
2042 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
2043 | some exceptions. --ANK | |
96d5822c EN |
2044 | We allow IPv4-mapped nexthops to support RFC4798-type |
2045 | addressing | |
1da177e4 | 2046 | */ |
96d5822c | 2047 | if (!(gwa_type & (IPV6_ADDR_UNICAST | |
d5d531cb DA |
2048 | IPV6_ADDR_MAPPED))) { |
2049 | NL_SET_ERR_MSG(extack, | |
2050 | "Invalid gateway address"); | |
1da177e4 | 2051 | goto out; |
d5d531cb | 2052 | } |
1da177e4 | 2053 | |
a435a07f | 2054 | if (cfg->fc_table) { |
8c14586f DA |
2055 | grt = ip6_nh_lookup_table(net, cfg, gw_addr); |
2056 | ||
a435a07f VB |
2057 | if (grt) { |
2058 | if (grt->rt6i_flags & RTF_GATEWAY || | |
2059 | (dev && dev != grt->dst.dev)) { | |
2060 | ip6_rt_put(grt); | |
2061 | grt = NULL; | |
2062 | } | |
2063 | } | |
2064 | } | |
2065 | ||
8c14586f DA |
2066 | if (!grt) |
2067 | grt = rt6_lookup(net, gw_addr, NULL, | |
2068 | cfg->fc_ifindex, 1); | |
1da177e4 LT |
2069 | |
2070 | err = -EHOSTUNREACH; | |
38308473 | 2071 | if (!grt) |
1da177e4 LT |
2072 | goto out; |
2073 | if (dev) { | |
d1918542 | 2074 | if (dev != grt->dst.dev) { |
94e187c0 | 2075 | ip6_rt_put(grt); |
1da177e4 LT |
2076 | goto out; |
2077 | } | |
2078 | } else { | |
d1918542 | 2079 | dev = grt->dst.dev; |
1da177e4 LT |
2080 | idev = grt->rt6i_idev; |
2081 | dev_hold(dev); | |
2082 | in6_dev_hold(grt->rt6i_idev); | |
2083 | } | |
38308473 | 2084 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 2085 | err = 0; |
94e187c0 | 2086 | ip6_rt_put(grt); |
1da177e4 LT |
2087 | |
2088 | if (err) | |
2089 | goto out; | |
2090 | } | |
2091 | err = -EINVAL; | |
d5d531cb DA |
2092 | if (!dev) { |
2093 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
2094 | goto out; | |
2095 | } else if (dev->flags & IFF_LOOPBACK) { | |
2096 | NL_SET_ERR_MSG(extack, | |
2097 | "Egress device can not be loopback device for this route"); | |
1da177e4 | 2098 | goto out; |
d5d531cb | 2099 | } |
1da177e4 LT |
2100 | } |
2101 | ||
2102 | err = -ENODEV; | |
38308473 | 2103 | if (!dev) |
1da177e4 LT |
2104 | goto out; |
2105 | ||
c3968a85 DW |
2106 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
2107 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
d5d531cb | 2108 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
2109 | err = -EINVAL; |
2110 | goto out; | |
2111 | } | |
4e3fd7a0 | 2112 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
2113 | rt->rt6i_prefsrc.plen = 128; |
2114 | } else | |
2115 | rt->rt6i_prefsrc.plen = 0; | |
2116 | ||
86872cb5 | 2117 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
2118 | |
2119 | install_route: | |
d8d1f30b | 2120 | rt->dst.dev = dev; |
1da177e4 | 2121 | rt->rt6i_idev = idev; |
c71099ac | 2122 | rt->rt6i_table = table; |
63152fc0 | 2123 | |
c346dca1 | 2124 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 2125 | |
8c5b83f0 | 2126 | return rt; |
6b9ea5a6 RP |
2127 | out: |
2128 | if (dev) | |
2129 | dev_put(dev); | |
2130 | if (idev) | |
2131 | in6_dev_put(idev); | |
2132 | if (rt) | |
2133 | dst_free(&rt->dst); | |
2134 | ||
8c5b83f0 | 2135 | return ERR_PTR(err); |
6b9ea5a6 RP |
2136 | } |
2137 | ||
333c4301 DA |
2138 | int ip6_route_add(struct fib6_config *cfg, |
2139 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
2140 | { |
2141 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 2142 | struct rt6_info *rt; |
6b9ea5a6 RP |
2143 | int err; |
2144 | ||
333c4301 | 2145 | rt = ip6_route_info_create(cfg, extack); |
8c5b83f0 RP |
2146 | if (IS_ERR(rt)) { |
2147 | err = PTR_ERR(rt); | |
2148 | rt = NULL; | |
6b9ea5a6 | 2149 | goto out; |
8c5b83f0 | 2150 | } |
6b9ea5a6 | 2151 | |
e715b6d3 FW |
2152 | err = ip6_convert_metrics(&mxc, cfg); |
2153 | if (err) | |
2154 | goto out; | |
1da177e4 | 2155 | |
333c4301 | 2156 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc, extack); |
e715b6d3 FW |
2157 | |
2158 | kfree(mxc.mx); | |
6b9ea5a6 | 2159 | |
e715b6d3 | 2160 | return err; |
1da177e4 | 2161 | out: |
1da177e4 | 2162 | if (rt) |
d8d1f30b | 2163 | dst_free(&rt->dst); |
6b9ea5a6 | 2164 | |
1da177e4 LT |
2165 | return err; |
2166 | } | |
2167 | ||
86872cb5 | 2168 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2169 | { |
2170 | int err; | |
c71099ac | 2171 | struct fib6_table *table; |
d1918542 | 2172 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2173 | |
8e3d5be7 MKL |
2174 | if (rt == net->ipv6.ip6_null_entry || |
2175 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2176 | err = -ENOENT; |
2177 | goto out; | |
2178 | } | |
6c813a72 | 2179 | |
c71099ac TG |
2180 | table = rt->rt6i_table; |
2181 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2182 | err = fib6_del(rt, info); |
c71099ac | 2183 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2184 | |
6825a26c | 2185 | out: |
94e187c0 | 2186 | ip6_rt_put(rt); |
1da177e4 LT |
2187 | return err; |
2188 | } | |
2189 | ||
e0a1ad73 TG |
2190 | int ip6_del_rt(struct rt6_info *rt) |
2191 | { | |
4d1169c1 | 2192 | struct nl_info info = { |
d1918542 | 2193 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2194 | }; |
528c4ceb | 2195 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2196 | } |
2197 | ||
0ae81335 DA |
2198 | static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg) |
2199 | { | |
2200 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 2201 | struct net *net = info->nl_net; |
16a16cd3 | 2202 | struct sk_buff *skb = NULL; |
0ae81335 | 2203 | struct fib6_table *table; |
e3330039 | 2204 | int err = -ENOENT; |
0ae81335 | 2205 | |
e3330039 WC |
2206 | if (rt == net->ipv6.ip6_null_entry) |
2207 | goto out_put; | |
0ae81335 DA |
2208 | table = rt->rt6i_table; |
2209 | write_lock_bh(&table->tb6_lock); | |
2210 | ||
2211 | if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) { | |
2212 | struct rt6_info *sibling, *next_sibling; | |
2213 | ||
16a16cd3 DA |
2214 | /* prefer to send a single notification with all hops */ |
2215 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
2216 | if (skb) { | |
2217 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
2218 | ||
e3330039 | 2219 | if (rt6_fill_node(net, skb, rt, |
16a16cd3 DA |
2220 | NULL, NULL, 0, RTM_DELROUTE, |
2221 | info->portid, seq, 0) < 0) { | |
2222 | kfree_skb(skb); | |
2223 | skb = NULL; | |
2224 | } else | |
2225 | info->skip_notify = 1; | |
2226 | } | |
2227 | ||
0ae81335 DA |
2228 | list_for_each_entry_safe(sibling, next_sibling, |
2229 | &rt->rt6i_siblings, | |
2230 | rt6i_siblings) { | |
2231 | err = fib6_del(sibling, info); | |
2232 | if (err) | |
e3330039 | 2233 | goto out_unlock; |
0ae81335 DA |
2234 | } |
2235 | } | |
2236 | ||
2237 | err = fib6_del(rt, info); | |
e3330039 | 2238 | out_unlock: |
0ae81335 | 2239 | write_unlock_bh(&table->tb6_lock); |
e3330039 | 2240 | out_put: |
0ae81335 | 2241 | ip6_rt_put(rt); |
16a16cd3 DA |
2242 | |
2243 | if (skb) { | |
e3330039 | 2244 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
2245 | info->nlh, gfp_any()); |
2246 | } | |
0ae81335 DA |
2247 | return err; |
2248 | } | |
2249 | ||
333c4301 DA |
2250 | static int ip6_route_del(struct fib6_config *cfg, |
2251 | struct netlink_ext_ack *extack) | |
1da177e4 | 2252 | { |
c71099ac | 2253 | struct fib6_table *table; |
1da177e4 LT |
2254 | struct fib6_node *fn; |
2255 | struct rt6_info *rt; | |
2256 | int err = -ESRCH; | |
2257 | ||
5578689a | 2258 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
2259 | if (!table) { |
2260 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 2261 | return err; |
d5d531cb | 2262 | } |
c71099ac TG |
2263 | |
2264 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2265 | |
c71099ac | 2266 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2267 | &cfg->fc_dst, cfg->fc_dst_len, |
2268 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2269 | |
1da177e4 | 2270 | if (fn) { |
d8d1f30b | 2271 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2272 | if ((rt->rt6i_flags & RTF_CACHE) && |
2273 | !(cfg->fc_flags & RTF_CACHE)) | |
2274 | continue; | |
86872cb5 | 2275 | if (cfg->fc_ifindex && |
d1918542 DM |
2276 | (!rt->dst.dev || |
2277 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2278 | continue; |
86872cb5 TG |
2279 | if (cfg->fc_flags & RTF_GATEWAY && |
2280 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2281 | continue; |
86872cb5 | 2282 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2283 | continue; |
c2ed1880 M |
2284 | if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol) |
2285 | continue; | |
d8d1f30b | 2286 | dst_hold(&rt->dst); |
c71099ac | 2287 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2288 | |
0ae81335 DA |
2289 | /* if gateway was specified only delete the one hop */ |
2290 | if (cfg->fc_flags & RTF_GATEWAY) | |
2291 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
2292 | ||
2293 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
2294 | } |
2295 | } | |
c71099ac | 2296 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2297 | |
2298 | return err; | |
2299 | } | |
2300 | ||
6700c270 | 2301 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2302 | { |
a6279458 | 2303 | struct netevent_redirect netevent; |
e8599ff4 | 2304 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2305 | struct ndisc_options ndopts; |
2306 | struct inet6_dev *in6_dev; | |
2307 | struct neighbour *neigh; | |
71bcdba0 | 2308 | struct rd_msg *msg; |
6e157b6a DM |
2309 | int optlen, on_link; |
2310 | u8 *lladdr; | |
e8599ff4 | 2311 | |
29a3cad5 | 2312 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2313 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2314 | |
2315 | if (optlen < 0) { | |
6e157b6a | 2316 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2317 | return; |
2318 | } | |
2319 | ||
71bcdba0 | 2320 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2321 | |
71bcdba0 | 2322 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2323 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2324 | return; |
2325 | } | |
2326 | ||
6e157b6a | 2327 | on_link = 0; |
71bcdba0 | 2328 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2329 | on_link = 1; |
71bcdba0 | 2330 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2331 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2332 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2333 | return; |
2334 | } | |
2335 | ||
2336 | in6_dev = __in6_dev_get(skb->dev); | |
2337 | if (!in6_dev) | |
2338 | return; | |
2339 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2340 | return; | |
2341 | ||
2342 | /* RFC2461 8.1: | |
2343 | * The IP source address of the Redirect MUST be the same as the current | |
2344 | * first-hop router for the specified ICMP Destination Address. | |
2345 | */ | |
2346 | ||
f997c55c | 2347 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2348 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2349 | return; | |
2350 | } | |
6e157b6a DM |
2351 | |
2352 | lladdr = NULL; | |
e8599ff4 DM |
2353 | if (ndopts.nd_opts_tgt_lladdr) { |
2354 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2355 | skb->dev); | |
2356 | if (!lladdr) { | |
2357 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2358 | return; | |
2359 | } | |
2360 | } | |
2361 | ||
6e157b6a | 2362 | rt = (struct rt6_info *) dst; |
ec13ad1d | 2363 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 2364 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 2365 | return; |
6e157b6a | 2366 | } |
e8599ff4 | 2367 | |
6e157b6a DM |
2368 | /* Redirect received -> path was valid. |
2369 | * Look, redirects are sent only in response to data packets, | |
2370 | * so that this nexthop apparently is reachable. --ANK | |
2371 | */ | |
0dec879f | 2372 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 2373 | |
71bcdba0 | 2374 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2375 | if (!neigh) |
2376 | return; | |
a6279458 | 2377 | |
1da177e4 LT |
2378 | /* |
2379 | * We have finally decided to accept it. | |
2380 | */ | |
2381 | ||
f997c55c | 2382 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2383 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2384 | NEIGH_UPDATE_F_OVERRIDE| | |
2385 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
2386 | NEIGH_UPDATE_F_ISROUTER)), |
2387 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 2388 | |
83a09abd | 2389 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2390 | if (!nrt) |
1da177e4 LT |
2391 | goto out; |
2392 | ||
2393 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2394 | if (on_link) | |
2395 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2396 | ||
4e3fd7a0 | 2397 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2398 | |
40e22e8f | 2399 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2400 | goto out; |
2401 | ||
d8d1f30b CG |
2402 | netevent.old = &rt->dst; |
2403 | netevent.new = &nrt->dst; | |
71bcdba0 | 2404 | netevent.daddr = &msg->dest; |
60592833 | 2405 | netevent.neigh = neigh; |
8d71740c TT |
2406 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2407 | ||
38308473 | 2408 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2409 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2410 | ip6_del_rt(rt); |
1da177e4 LT |
2411 | } |
2412 | ||
2413 | out: | |
e8599ff4 | 2414 | neigh_release(neigh); |
6e157b6a DM |
2415 | } |
2416 | ||
1da177e4 LT |
2417 | /* |
2418 | * Misc support functions | |
2419 | */ | |
2420 | ||
4b32b5ad MKL |
2421 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2422 | { | |
2423 | BUG_ON(from->dst.from); | |
2424 | ||
2425 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2426 | dst_hold(&from->dst); | |
2427 | rt->dst.from = &from->dst; | |
2428 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2429 | } | |
2430 | ||
83a09abd MKL |
2431 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2432 | { | |
2433 | rt->dst.input = ort->dst.input; | |
2434 | rt->dst.output = ort->dst.output; | |
2435 | rt->rt6i_dst = ort->rt6i_dst; | |
2436 | rt->dst.error = ort->dst.error; | |
2437 | rt->rt6i_idev = ort->rt6i_idev; | |
2438 | if (rt->rt6i_idev) | |
2439 | in6_dev_hold(rt->rt6i_idev); | |
2440 | rt->dst.lastuse = jiffies; | |
2441 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2442 | rt->rt6i_flags = ort->rt6i_flags; | |
2443 | rt6_set_from(rt, ort); | |
2444 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2445 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2446 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2447 | #endif |
83a09abd MKL |
2448 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2449 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2450 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2451 | } |
2452 | ||
70ceb4f5 | 2453 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2454 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 2455 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
2456 | const struct in6_addr *gwaddr, |
2457 | struct net_device *dev) | |
70ceb4f5 | 2458 | { |
830218c1 DA |
2459 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
2460 | int ifindex = dev->ifindex; | |
70ceb4f5 YH |
2461 | struct fib6_node *fn; |
2462 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2463 | struct fib6_table *table; |
2464 | ||
830218c1 | 2465 | table = fib6_get_table(net, tb_id); |
38308473 | 2466 | if (!table) |
c71099ac | 2467 | return NULL; |
70ceb4f5 | 2468 | |
5744dd9b | 2469 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2470 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2471 | if (!fn) |
2472 | goto out; | |
2473 | ||
d8d1f30b | 2474 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2475 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2476 | continue; |
2477 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2478 | continue; | |
2479 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2480 | continue; | |
d8d1f30b | 2481 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2482 | break; |
2483 | } | |
2484 | out: | |
5744dd9b | 2485 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2486 | return rt; |
2487 | } | |
2488 | ||
efa2cea0 | 2489 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 2490 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
2491 | const struct in6_addr *gwaddr, |
2492 | struct net_device *dev, | |
95c96174 | 2493 | unsigned int pref) |
70ceb4f5 | 2494 | { |
86872cb5 | 2495 | struct fib6_config cfg = { |
238fc7ea | 2496 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 2497 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
2498 | .fc_dst_len = prefixlen, |
2499 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2500 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2501 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2502 | .fc_nlinfo.nlh = NULL, |
2503 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2504 | }; |
2505 | ||
830218c1 | 2506 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
2507 | cfg.fc_dst = *prefix; |
2508 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2509 | |
e317da96 YH |
2510 | /* We should treat it as a default route if prefix length is 0. */ |
2511 | if (!prefixlen) | |
86872cb5 | 2512 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2513 | |
333c4301 | 2514 | ip6_route_add(&cfg, NULL); |
70ceb4f5 | 2515 | |
830218c1 | 2516 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
2517 | } |
2518 | #endif | |
2519 | ||
b71d1d42 | 2520 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2521 | { |
830218c1 | 2522 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
1da177e4 | 2523 | struct rt6_info *rt; |
c71099ac | 2524 | struct fib6_table *table; |
1da177e4 | 2525 | |
830218c1 | 2526 | table = fib6_get_table(dev_net(dev), tb_id); |
38308473 | 2527 | if (!table) |
c71099ac | 2528 | return NULL; |
1da177e4 | 2529 | |
5744dd9b | 2530 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2531 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2532 | if (dev == rt->dst.dev && |
045927ff | 2533 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2534 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2535 | break; | |
2536 | } | |
2537 | if (rt) | |
d8d1f30b | 2538 | dst_hold(&rt->dst); |
5744dd9b | 2539 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2540 | return rt; |
2541 | } | |
2542 | ||
b71d1d42 | 2543 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2544 | struct net_device *dev, |
2545 | unsigned int pref) | |
1da177e4 | 2546 | { |
86872cb5 | 2547 | struct fib6_config cfg = { |
ca254490 | 2548 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 2549 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2550 | .fc_ifindex = dev->ifindex, |
2551 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2552 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2553 | .fc_nlinfo.portid = 0, |
5578689a | 2554 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2555 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2556 | }; |
1da177e4 | 2557 | |
4e3fd7a0 | 2558 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2559 | |
333c4301 | 2560 | if (!ip6_route_add(&cfg, NULL)) { |
830218c1 DA |
2561 | struct fib6_table *table; |
2562 | ||
2563 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
2564 | if (table) | |
2565 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
2566 | } | |
1da177e4 | 2567 | |
1da177e4 LT |
2568 | return rt6_get_dflt_router(gwaddr, dev); |
2569 | } | |
2570 | ||
830218c1 | 2571 | static void __rt6_purge_dflt_routers(struct fib6_table *table) |
1da177e4 LT |
2572 | { |
2573 | struct rt6_info *rt; | |
2574 | ||
2575 | restart: | |
c71099ac | 2576 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2577 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2578 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2579 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2580 | dst_hold(&rt->dst); |
c71099ac | 2581 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2582 | ip6_del_rt(rt); |
1da177e4 LT |
2583 | goto restart; |
2584 | } | |
2585 | } | |
c71099ac | 2586 | read_unlock_bh(&table->tb6_lock); |
830218c1 DA |
2587 | |
2588 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
2589 | } | |
2590 | ||
2591 | void rt6_purge_dflt_routers(struct net *net) | |
2592 | { | |
2593 | struct fib6_table *table; | |
2594 | struct hlist_head *head; | |
2595 | unsigned int h; | |
2596 | ||
2597 | rcu_read_lock(); | |
2598 | ||
2599 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
2600 | head = &net->ipv6.fib_table_hash[h]; | |
2601 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
2602 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
2603 | __rt6_purge_dflt_routers(table); | |
2604 | } | |
2605 | } | |
2606 | ||
2607 | rcu_read_unlock(); | |
1da177e4 LT |
2608 | } |
2609 | ||
5578689a DL |
2610 | static void rtmsg_to_fib6_config(struct net *net, |
2611 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2612 | struct fib6_config *cfg) |
2613 | { | |
2614 | memset(cfg, 0, sizeof(*cfg)); | |
2615 | ||
ca254490 DA |
2616 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
2617 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
2618 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
2619 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2620 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2621 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2622 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2623 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2624 | ||
5578689a | 2625 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2626 | |
4e3fd7a0 AD |
2627 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2628 | cfg->fc_src = rtmsg->rtmsg_src; | |
2629 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2630 | } |
2631 | ||
5578689a | 2632 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2633 | { |
86872cb5 | 2634 | struct fib6_config cfg; |
1da177e4 LT |
2635 | struct in6_rtmsg rtmsg; |
2636 | int err; | |
2637 | ||
67ba4152 | 2638 | switch (cmd) { |
1da177e4 LT |
2639 | case SIOCADDRT: /* Add a route */ |
2640 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2641 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2642 | return -EPERM; |
2643 | err = copy_from_user(&rtmsg, arg, | |
2644 | sizeof(struct in6_rtmsg)); | |
2645 | if (err) | |
2646 | return -EFAULT; | |
86872cb5 | 2647 | |
5578689a | 2648 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2649 | |
1da177e4 LT |
2650 | rtnl_lock(); |
2651 | switch (cmd) { | |
2652 | case SIOCADDRT: | |
333c4301 | 2653 | err = ip6_route_add(&cfg, NULL); |
1da177e4 LT |
2654 | break; |
2655 | case SIOCDELRT: | |
333c4301 | 2656 | err = ip6_route_del(&cfg, NULL); |
1da177e4 LT |
2657 | break; |
2658 | default: | |
2659 | err = -EINVAL; | |
2660 | } | |
2661 | rtnl_unlock(); | |
2662 | ||
2663 | return err; | |
3ff50b79 | 2664 | } |
1da177e4 LT |
2665 | |
2666 | return -EINVAL; | |
2667 | } | |
2668 | ||
2669 | /* | |
2670 | * Drop the packet on the floor | |
2671 | */ | |
2672 | ||
d5fdd6ba | 2673 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2674 | { |
612f09e8 | 2675 | int type; |
adf30907 | 2676 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2677 | switch (ipstats_mib_noroutes) { |
2678 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2679 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2680 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2681 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2682 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2683 | break; |
2684 | } | |
2685 | /* FALLTHROUGH */ | |
2686 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2687 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2688 | ipstats_mib_noroutes); | |
612f09e8 YH |
2689 | break; |
2690 | } | |
3ffe533c | 2691 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2692 | kfree_skb(skb); |
2693 | return 0; | |
2694 | } | |
2695 | ||
9ce8ade0 TG |
2696 | static int ip6_pkt_discard(struct sk_buff *skb) |
2697 | { | |
612f09e8 | 2698 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2699 | } |
2700 | ||
ede2059d | 2701 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2702 | { |
adf30907 | 2703 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2704 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2705 | } |
2706 | ||
9ce8ade0 TG |
2707 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2708 | { | |
612f09e8 | 2709 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2710 | } |
2711 | ||
ede2059d | 2712 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2713 | { |
adf30907 | 2714 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2715 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2716 | } |
2717 | ||
1da177e4 LT |
2718 | /* |
2719 | * Allocate a dst for local (unicast / anycast) address. | |
2720 | */ | |
2721 | ||
2722 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2723 | const struct in6_addr *addr, | |
8f031519 | 2724 | bool anycast) |
1da177e4 | 2725 | { |
ca254490 | 2726 | u32 tb_id; |
c346dca1 | 2727 | struct net *net = dev_net(idev->dev); |
5f02ce24 DA |
2728 | struct net_device *dev = net->loopback_dev; |
2729 | struct rt6_info *rt; | |
2730 | ||
2731 | /* use L3 Master device as loopback for host routes if device | |
2732 | * is enslaved and address is not link local or multicast | |
2733 | */ | |
2734 | if (!rt6_need_strict(addr)) | |
2735 | dev = l3mdev_master_dev_rcu(idev->dev) ? : dev; | |
2736 | ||
2737 | rt = ip6_dst_alloc(net, dev, DST_NOCOUNT); | |
a3300ef4 | 2738 | if (!rt) |
1da177e4 LT |
2739 | return ERR_PTR(-ENOMEM); |
2740 | ||
1da177e4 LT |
2741 | in6_dev_hold(idev); |
2742 | ||
11d53b49 | 2743 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2744 | rt->dst.input = ip6_input; |
2745 | rt->dst.output = ip6_output; | |
1da177e4 | 2746 | rt->rt6i_idev = idev; |
1da177e4 | 2747 | |
94b5e0f9 | 2748 | rt->rt6i_protocol = RTPROT_KERNEL; |
1da177e4 | 2749 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
58c4fb86 YH |
2750 | if (anycast) |
2751 | rt->rt6i_flags |= RTF_ANYCAST; | |
2752 | else | |
1da177e4 | 2753 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2754 | |
550bab42 | 2755 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2756 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2757 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
2758 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
2759 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
8e3d5be7 | 2760 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2761 | |
d8d1f30b | 2762 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2763 | |
2764 | return rt; | |
2765 | } | |
2766 | ||
c3968a85 DW |
2767 | /* remove deleted ip from prefsrc entries */ |
2768 | struct arg_dev_net_ip { | |
2769 | struct net_device *dev; | |
2770 | struct net *net; | |
2771 | struct in6_addr *addr; | |
2772 | }; | |
2773 | ||
2774 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2775 | { | |
2776 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2777 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2778 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2779 | ||
d1918542 | 2780 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2781 | rt != net->ipv6.ip6_null_entry && |
2782 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2783 | /* remove prefsrc entry */ | |
2784 | rt->rt6i_prefsrc.plen = 0; | |
2785 | } | |
2786 | return 0; | |
2787 | } | |
2788 | ||
2789 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2790 | { | |
2791 | struct net *net = dev_net(ifp->idev->dev); | |
2792 | struct arg_dev_net_ip adni = { | |
2793 | .dev = ifp->idev->dev, | |
2794 | .net = net, | |
2795 | .addr = &ifp->addr, | |
2796 | }; | |
0c3584d5 | 2797 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2798 | } |
2799 | ||
be7a010d DJ |
2800 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2801 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2802 | ||
2803 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2804 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2805 | { | |
2806 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2807 | ||
2808 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2809 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2810 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2811 | return -1; | |
2812 | } | |
2813 | return 0; | |
2814 | } | |
2815 | ||
2816 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2817 | { | |
2818 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2819 | } | |
2820 | ||
8ed67789 DL |
2821 | struct arg_dev_net { |
2822 | struct net_device *dev; | |
2823 | struct net *net; | |
2824 | }; | |
2825 | ||
a1a22c12 | 2826 | /* called with write lock held for table with rt */ |
1da177e4 LT |
2827 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2828 | { | |
bc3ef660 | 2829 | const struct arg_dev_net *adn = arg; |
2830 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2831 | |
d1918542 | 2832 | if ((rt->dst.dev == dev || !dev) && |
a1a22c12 DA |
2833 | rt != adn->net->ipv6.ip6_null_entry && |
2834 | (rt->rt6i_nsiblings == 0 || | |
2835 | !rt->rt6i_idev->cnf.ignore_routes_with_linkdown)) | |
1da177e4 | 2836 | return -1; |
c159d30c | 2837 | |
1da177e4 LT |
2838 | return 0; |
2839 | } | |
2840 | ||
f3db4851 | 2841 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2842 | { |
8ed67789 DL |
2843 | struct arg_dev_net adn = { |
2844 | .dev = dev, | |
2845 | .net = net, | |
2846 | }; | |
2847 | ||
0c3584d5 | 2848 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2849 | icmp6_clean_all(fib6_ifdown, &adn); |
e332bc67 EB |
2850 | if (dev) |
2851 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
2852 | } |
2853 | ||
95c96174 | 2854 | struct rt6_mtu_change_arg { |
1da177e4 | 2855 | struct net_device *dev; |
95c96174 | 2856 | unsigned int mtu; |
1da177e4 LT |
2857 | }; |
2858 | ||
2859 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2860 | { | |
2861 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2862 | struct inet6_dev *idev; | |
2863 | ||
2864 | /* In IPv6 pmtu discovery is not optional, | |
2865 | so that RTAX_MTU lock cannot disable it. | |
2866 | We still use this lock to block changes | |
2867 | caused by addrconf/ndisc. | |
2868 | */ | |
2869 | ||
2870 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2871 | if (!idev) |
1da177e4 LT |
2872 | return 0; |
2873 | ||
2874 | /* For administrative MTU increase, there is no way to discover | |
2875 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2876 | Since RFC 1981 doesn't include administrative MTU increase | |
2877 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2878 | */ | |
2879 | /* | |
2880 | If new MTU is less than route PMTU, this new MTU will be the | |
2881 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2882 | decreases; if new MTU is greater than route PMTU, and the | |
2883 | old MTU is the lowest MTU in the path, update the route PMTU | |
2884 | to reflect the increase. In this case if the other nodes' MTU | |
2885 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
67c408cf | 2886 | PMTU discovery. |
1da177e4 | 2887 | */ |
d1918542 | 2888 | if (rt->dst.dev == arg->dev && |
fb56be83 | 2889 | dst_metric_raw(&rt->dst, RTAX_MTU) && |
4b32b5ad MKL |
2890 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2891 | if (rt->rt6i_flags & RTF_CACHE) { | |
2892 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2893 | * (i.e. a redirected route), | |
2894 | * the metrics of its rt->dst.from has already | |
2895 | * been updated. | |
2896 | */ | |
2897 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2898 | rt->rt6i_pmtu = arg->mtu; | |
2899 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2900 | (dst_mtu(&rt->dst) < arg->mtu && | |
2901 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2902 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2903 | } | |
566cfd8f | 2904 | } |
1da177e4 LT |
2905 | return 0; |
2906 | } | |
2907 | ||
95c96174 | 2908 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2909 | { |
c71099ac TG |
2910 | struct rt6_mtu_change_arg arg = { |
2911 | .dev = dev, | |
2912 | .mtu = mtu, | |
2913 | }; | |
1da177e4 | 2914 | |
0c3584d5 | 2915 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2916 | } |
2917 | ||
ef7c79ed | 2918 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2919 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2920 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2921 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2922 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2923 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2924 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2925 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2926 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2927 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 2928 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 2929 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 2930 | [RTA_MARK] = { .type = NLA_U32 }, |
86872cb5 TG |
2931 | }; |
2932 | ||
2933 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
2934 | struct fib6_config *cfg, |
2935 | struct netlink_ext_ack *extack) | |
1da177e4 | 2936 | { |
86872cb5 TG |
2937 | struct rtmsg *rtm; |
2938 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2939 | unsigned int pref; |
86872cb5 | 2940 | int err; |
1da177e4 | 2941 | |
fceb6435 JB |
2942 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
2943 | NULL); | |
86872cb5 TG |
2944 | if (err < 0) |
2945 | goto errout; | |
1da177e4 | 2946 | |
86872cb5 TG |
2947 | err = -EINVAL; |
2948 | rtm = nlmsg_data(nlh); | |
2949 | memset(cfg, 0, sizeof(*cfg)); | |
2950 | ||
2951 | cfg->fc_table = rtm->rtm_table; | |
2952 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2953 | cfg->fc_src_len = rtm->rtm_src_len; | |
2954 | cfg->fc_flags = RTF_UP; | |
2955 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2956 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2957 | |
ef2c7d7b ND |
2958 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2959 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2960 | rtm->rtm_type == RTN_PROHIBIT || |
2961 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2962 | cfg->fc_flags |= RTF_REJECT; |
2963 | ||
ab79ad14 MŻ |
2964 | if (rtm->rtm_type == RTN_LOCAL) |
2965 | cfg->fc_flags |= RTF_LOCAL; | |
2966 | ||
1f56a01f MKL |
2967 | if (rtm->rtm_flags & RTM_F_CLONED) |
2968 | cfg->fc_flags |= RTF_CACHE; | |
2969 | ||
15e47304 | 2970 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2971 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2972 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2973 | |
2974 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2975 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2976 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2977 | } |
86872cb5 TG |
2978 | |
2979 | if (tb[RTA_DST]) { | |
2980 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2981 | ||
2982 | if (nla_len(tb[RTA_DST]) < plen) | |
2983 | goto errout; | |
2984 | ||
2985 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2986 | } |
86872cb5 TG |
2987 | |
2988 | if (tb[RTA_SRC]) { | |
2989 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2990 | ||
2991 | if (nla_len(tb[RTA_SRC]) < plen) | |
2992 | goto errout; | |
2993 | ||
2994 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2995 | } |
86872cb5 | 2996 | |
c3968a85 | 2997 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2998 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2999 | |
86872cb5 TG |
3000 | if (tb[RTA_OIF]) |
3001 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
3002 | ||
3003 | if (tb[RTA_PRIORITY]) | |
3004 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
3005 | ||
3006 | if (tb[RTA_METRICS]) { | |
3007 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
3008 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 3009 | } |
86872cb5 TG |
3010 | |
3011 | if (tb[RTA_TABLE]) | |
3012 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
3013 | ||
51ebd318 ND |
3014 | if (tb[RTA_MULTIPATH]) { |
3015 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
3016 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
3017 | |
3018 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 3019 | cfg->fc_mp_len, extack); |
9ed59592 DA |
3020 | if (err < 0) |
3021 | goto errout; | |
51ebd318 ND |
3022 | } |
3023 | ||
c78ba6d6 LR |
3024 | if (tb[RTA_PREF]) { |
3025 | pref = nla_get_u8(tb[RTA_PREF]); | |
3026 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
3027 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
3028 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
3029 | cfg->fc_flags |= RTF_PREF(pref); | |
3030 | } | |
3031 | ||
19e42e45 RP |
3032 | if (tb[RTA_ENCAP]) |
3033 | cfg->fc_encap = tb[RTA_ENCAP]; | |
3034 | ||
9ed59592 | 3035 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
3036 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
3037 | ||
c255bd68 | 3038 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
3039 | if (err < 0) |
3040 | goto errout; | |
3041 | } | |
3042 | ||
32bc201e XL |
3043 | if (tb[RTA_EXPIRES]) { |
3044 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
3045 | ||
3046 | if (addrconf_finite_timeout(timeout)) { | |
3047 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
3048 | cfg->fc_flags |= RTF_EXPIRES; | |
3049 | } | |
3050 | } | |
3051 | ||
86872cb5 TG |
3052 | err = 0; |
3053 | errout: | |
3054 | return err; | |
1da177e4 LT |
3055 | } |
3056 | ||
6b9ea5a6 RP |
3057 | struct rt6_nh { |
3058 | struct rt6_info *rt6_info; | |
3059 | struct fib6_config r_cfg; | |
3060 | struct mx6_config mxc; | |
3061 | struct list_head next; | |
3062 | }; | |
3063 | ||
3064 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
3065 | { | |
3066 | struct rt6_nh *nh; | |
3067 | ||
3068 | list_for_each_entry(nh, rt6_nh_list, next) { | |
7d4d5065 | 3069 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n", |
6b9ea5a6 RP |
3070 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, |
3071 | nh->r_cfg.fc_ifindex); | |
3072 | } | |
3073 | } | |
3074 | ||
3075 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
3076 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
3077 | { | |
3078 | struct rt6_nh *nh; | |
3079 | struct rt6_info *rtnh; | |
3080 | int err = -EEXIST; | |
3081 | ||
3082 | list_for_each_entry(nh, rt6_nh_list, next) { | |
3083 | /* check if rt6_info already exists */ | |
3084 | rtnh = nh->rt6_info; | |
3085 | ||
3086 | if (rtnh->dst.dev == rt->dst.dev && | |
3087 | rtnh->rt6i_idev == rt->rt6i_idev && | |
3088 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
3089 | &rt->rt6i_gateway)) | |
3090 | return err; | |
3091 | } | |
3092 | ||
3093 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
3094 | if (!nh) | |
3095 | return -ENOMEM; | |
3096 | nh->rt6_info = rt; | |
3097 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
3098 | if (err) { | |
3099 | kfree(nh); | |
3100 | return err; | |
3101 | } | |
3102 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
3103 | list_add_tail(&nh->next, rt6_nh_list); | |
3104 | ||
3105 | return 0; | |
3106 | } | |
3107 | ||
3b1137fe DA |
3108 | static void ip6_route_mpath_notify(struct rt6_info *rt, |
3109 | struct rt6_info *rt_last, | |
3110 | struct nl_info *info, | |
3111 | __u16 nlflags) | |
3112 | { | |
3113 | /* if this is an APPEND route, then rt points to the first route | |
3114 | * inserted and rt_last points to last route inserted. Userspace | |
3115 | * wants a consistent dump of the route which starts at the first | |
3116 | * nexthop. Since sibling routes are always added at the end of | |
3117 | * the list, find the first sibling of the last route appended | |
3118 | */ | |
3119 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) { | |
3120 | rt = list_first_entry(&rt_last->rt6i_siblings, | |
3121 | struct rt6_info, | |
3122 | rt6i_siblings); | |
3123 | } | |
3124 | ||
3125 | if (rt) | |
3126 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
3127 | } | |
3128 | ||
333c4301 DA |
3129 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
3130 | struct netlink_ext_ack *extack) | |
51ebd318 | 3131 | { |
3b1137fe DA |
3132 | struct rt6_info *rt_notif = NULL, *rt_last = NULL; |
3133 | struct nl_info *info = &cfg->fc_nlinfo; | |
51ebd318 ND |
3134 | struct fib6_config r_cfg; |
3135 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
3136 | struct rt6_info *rt; |
3137 | struct rt6_nh *err_nh; | |
3138 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 3139 | __u16 nlflags; |
51ebd318 ND |
3140 | int remaining; |
3141 | int attrlen; | |
6b9ea5a6 RP |
3142 | int err = 1; |
3143 | int nhn = 0; | |
3144 | int replace = (cfg->fc_nlinfo.nlh && | |
3145 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
3146 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 3147 | |
3b1137fe DA |
3148 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
3149 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
3150 | nlflags |= NLM_F_APPEND; | |
3151 | ||
35f1b4e9 | 3152 | remaining = cfg->fc_mp_len; |
51ebd318 | 3153 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 3154 | |
6b9ea5a6 RP |
3155 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
3156 | * rt6_info structs per nexthop | |
3157 | */ | |
51ebd318 ND |
3158 | while (rtnh_ok(rtnh, remaining)) { |
3159 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3160 | if (rtnh->rtnh_ifindex) | |
3161 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3162 | ||
3163 | attrlen = rtnh_attrlen(rtnh); | |
3164 | if (attrlen > 0) { | |
3165 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3166 | ||
3167 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3168 | if (nla) { | |
67b61f6c | 3169 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
3170 | r_cfg.fc_flags |= RTF_GATEWAY; |
3171 | } | |
19e42e45 RP |
3172 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
3173 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
3174 | if (nla) | |
3175 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 3176 | } |
6b9ea5a6 | 3177 | |
333c4301 | 3178 | rt = ip6_route_info_create(&r_cfg, extack); |
8c5b83f0 RP |
3179 | if (IS_ERR(rt)) { |
3180 | err = PTR_ERR(rt); | |
3181 | rt = NULL; | |
6b9ea5a6 | 3182 | goto cleanup; |
8c5b83f0 | 3183 | } |
6b9ea5a6 RP |
3184 | |
3185 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 3186 | if (err) { |
6b9ea5a6 RP |
3187 | dst_free(&rt->dst); |
3188 | goto cleanup; | |
3189 | } | |
3190 | ||
3191 | rtnh = rtnh_next(rtnh, &remaining); | |
3192 | } | |
3193 | ||
3b1137fe DA |
3194 | /* for add and replace send one notification with all nexthops. |
3195 | * Skip the notification in fib6_add_rt2node and send one with | |
3196 | * the full route when done | |
3197 | */ | |
3198 | info->skip_notify = 1; | |
3199 | ||
6b9ea5a6 RP |
3200 | err_nh = NULL; |
3201 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3b1137fe | 3202 | rt_last = nh->rt6_info; |
333c4301 | 3203 | err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc, extack); |
3b1137fe DA |
3204 | /* save reference to first route for notification */ |
3205 | if (!rt_notif && !err) | |
3206 | rt_notif = nh->rt6_info; | |
3207 | ||
6b9ea5a6 RP |
3208 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ |
3209 | nh->rt6_info = NULL; | |
3210 | if (err) { | |
3211 | if (replace && nhn) | |
3212 | ip6_print_replace_route_err(&rt6_nh_list); | |
3213 | err_nh = nh; | |
3214 | goto add_errout; | |
51ebd318 | 3215 | } |
6b9ea5a6 | 3216 | |
1a72418b | 3217 | /* Because each route is added like a single route we remove |
27596472 MK |
3218 | * these flags after the first nexthop: if there is a collision, |
3219 | * we have already failed to add the first nexthop: | |
3220 | * fib6_add_rt2node() has rejected it; when replacing, old | |
3221 | * nexthops have been replaced by first new, the rest should | |
3222 | * be added to it. | |
1a72418b | 3223 | */ |
27596472 MK |
3224 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
3225 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
3226 | nhn++; |
3227 | } | |
3228 | ||
3b1137fe DA |
3229 | /* success ... tell user about new route */ |
3230 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
3231 | goto cleanup; |
3232 | ||
3233 | add_errout: | |
3b1137fe DA |
3234 | /* send notification for routes that were added so that |
3235 | * the delete notifications sent by ip6_route_del are | |
3236 | * coherent | |
3237 | */ | |
3238 | if (rt_notif) | |
3239 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
3240 | ||
6b9ea5a6 RP |
3241 | /* Delete routes that were already added */ |
3242 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3243 | if (err_nh == nh) | |
3244 | break; | |
333c4301 | 3245 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
3246 | } |
3247 | ||
3248 | cleanup: | |
3249 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
3250 | if (nh->rt6_info) | |
3251 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 3252 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
3253 | list_del(&nh->next); |
3254 | kfree(nh); | |
3255 | } | |
3256 | ||
3257 | return err; | |
3258 | } | |
3259 | ||
333c4301 DA |
3260 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
3261 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
3262 | { |
3263 | struct fib6_config r_cfg; | |
3264 | struct rtnexthop *rtnh; | |
3265 | int remaining; | |
3266 | int attrlen; | |
3267 | int err = 1, last_err = 0; | |
3268 | ||
3269 | remaining = cfg->fc_mp_len; | |
3270 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
3271 | ||
3272 | /* Parse a Multipath Entry */ | |
3273 | while (rtnh_ok(rtnh, remaining)) { | |
3274 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3275 | if (rtnh->rtnh_ifindex) | |
3276 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3277 | ||
3278 | attrlen = rtnh_attrlen(rtnh); | |
3279 | if (attrlen > 0) { | |
3280 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3281 | ||
3282 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3283 | if (nla) { | |
3284 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
3285 | r_cfg.fc_flags |= RTF_GATEWAY; | |
3286 | } | |
3287 | } | |
333c4301 | 3288 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
3289 | if (err) |
3290 | last_err = err; | |
3291 | ||
51ebd318 ND |
3292 | rtnh = rtnh_next(rtnh, &remaining); |
3293 | } | |
3294 | ||
3295 | return last_err; | |
3296 | } | |
3297 | ||
c21ef3e3 DA |
3298 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
3299 | struct netlink_ext_ack *extack) | |
1da177e4 | 3300 | { |
86872cb5 TG |
3301 | struct fib6_config cfg; |
3302 | int err; | |
1da177e4 | 3303 | |
333c4301 | 3304 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
3305 | if (err < 0) |
3306 | return err; | |
3307 | ||
51ebd318 | 3308 | if (cfg.fc_mp) |
333c4301 | 3309 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
3310 | else { |
3311 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 3312 | return ip6_route_del(&cfg, extack); |
0ae81335 | 3313 | } |
1da177e4 LT |
3314 | } |
3315 | ||
c21ef3e3 DA |
3316 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
3317 | struct netlink_ext_ack *extack) | |
1da177e4 | 3318 | { |
86872cb5 TG |
3319 | struct fib6_config cfg; |
3320 | int err; | |
1da177e4 | 3321 | |
333c4301 | 3322 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
3323 | if (err < 0) |
3324 | return err; | |
3325 | ||
51ebd318 | 3326 | if (cfg.fc_mp) |
333c4301 | 3327 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 3328 | else |
333c4301 | 3329 | return ip6_route_add(&cfg, extack); |
1da177e4 LT |
3330 | } |
3331 | ||
beb1afac | 3332 | static size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f | 3333 | { |
beb1afac DA |
3334 | int nexthop_len = 0; |
3335 | ||
3336 | if (rt->rt6i_nsiblings) { | |
3337 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
3338 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
3339 | + nla_total_size(16) /* RTA_GATEWAY */ | |
beb1afac DA |
3340 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
3341 | ||
3342 | nexthop_len *= rt->rt6i_nsiblings; | |
3343 | } | |
3344 | ||
339bf98f TG |
3345 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
3346 | + nla_total_size(16) /* RTA_SRC */ | |
3347 | + nla_total_size(16) /* RTA_DST */ | |
3348 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3349 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3350 | + nla_total_size(4) /* RTA_TABLE */ | |
3351 | + nla_total_size(4) /* RTA_IIF */ | |
3352 | + nla_total_size(4) /* RTA_OIF */ | |
3353 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3354 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3355 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3356 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3357 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
3358 | + lwtunnel_get_encap_size(rt->dst.lwtstate) |
3359 | + nexthop_len; | |
3360 | } | |
3361 | ||
3362 | static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt, | |
5be083ce | 3363 | unsigned int *flags, bool skip_oif) |
beb1afac DA |
3364 | { |
3365 | if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) { | |
3366 | *flags |= RTNH_F_LINKDOWN; | |
3367 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) | |
3368 | *flags |= RTNH_F_DEAD; | |
3369 | } | |
3370 | ||
3371 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
3372 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) | |
3373 | goto nla_put_failure; | |
3374 | } | |
3375 | ||
5be083ce DA |
3376 | /* not needed for multipath encoding b/c it has a rtnexthop struct */ |
3377 | if (!skip_oif && rt->dst.dev && | |
beb1afac DA |
3378 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
3379 | goto nla_put_failure; | |
3380 | ||
3381 | if (rt->dst.lwtstate && | |
3382 | lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0) | |
3383 | goto nla_put_failure; | |
3384 | ||
3385 | return 0; | |
3386 | ||
3387 | nla_put_failure: | |
3388 | return -EMSGSIZE; | |
3389 | } | |
3390 | ||
5be083ce | 3391 | /* add multipath next hop */ |
beb1afac DA |
3392 | static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt) |
3393 | { | |
3394 | struct rtnexthop *rtnh; | |
3395 | unsigned int flags = 0; | |
3396 | ||
3397 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
3398 | if (!rtnh) | |
3399 | goto nla_put_failure; | |
3400 | ||
3401 | rtnh->rtnh_hops = 0; | |
3402 | rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0; | |
3403 | ||
5be083ce | 3404 | if (rt6_nexthop_info(skb, rt, &flags, true) < 0) |
beb1afac DA |
3405 | goto nla_put_failure; |
3406 | ||
3407 | rtnh->rtnh_flags = flags; | |
3408 | ||
3409 | /* length of rtnetlink header + attributes */ | |
3410 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
3411 | ||
3412 | return 0; | |
3413 | ||
3414 | nla_put_failure: | |
3415 | return -EMSGSIZE; | |
339bf98f TG |
3416 | } |
3417 | ||
191cd582 BH |
3418 | static int rt6_fill_node(struct net *net, |
3419 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3420 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3421 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 3422 | unsigned int flags) |
1da177e4 | 3423 | { |
4b32b5ad | 3424 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3425 | struct rtmsg *rtm; |
2d7202bf | 3426 | struct nlmsghdr *nlh; |
e3703b3d | 3427 | long expires; |
9e762a4a | 3428 | u32 table; |
1da177e4 | 3429 | |
15e47304 | 3430 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3431 | if (!nlh) |
26932566 | 3432 | return -EMSGSIZE; |
2d7202bf TG |
3433 | |
3434 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3435 | rtm->rtm_family = AF_INET6; |
3436 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3437 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3438 | rtm->rtm_tos = 0; | |
c71099ac | 3439 | if (rt->rt6i_table) |
9e762a4a | 3440 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3441 | else |
9e762a4a PM |
3442 | table = RT6_TABLE_UNSPEC; |
3443 | rtm->rtm_table = table; | |
c78679e8 DM |
3444 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3445 | goto nla_put_failure; | |
ef2c7d7b ND |
3446 | if (rt->rt6i_flags & RTF_REJECT) { |
3447 | switch (rt->dst.error) { | |
3448 | case -EINVAL: | |
3449 | rtm->rtm_type = RTN_BLACKHOLE; | |
3450 | break; | |
3451 | case -EACCES: | |
3452 | rtm->rtm_type = RTN_PROHIBIT; | |
3453 | break; | |
b4949ab2 ND |
3454 | case -EAGAIN: |
3455 | rtm->rtm_type = RTN_THROW; | |
3456 | break; | |
ef2c7d7b ND |
3457 | default: |
3458 | rtm->rtm_type = RTN_UNREACHABLE; | |
3459 | break; | |
3460 | } | |
3461 | } | |
38308473 | 3462 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3463 | rtm->rtm_type = RTN_LOCAL; |
4ee39733 DA |
3464 | else if (rt->rt6i_flags & RTF_ANYCAST) |
3465 | rtm->rtm_type = RTN_ANYCAST; | |
d1918542 | 3466 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3467 | rtm->rtm_type = RTN_LOCAL; |
3468 | else | |
3469 | rtm->rtm_type = RTN_UNICAST; | |
3470 | rtm->rtm_flags = 0; | |
3471 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
3472 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3473 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3474 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3475 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3476 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3477 | rtm->rtm_protocol = RTPROT_RA; | |
3478 | else | |
3479 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3480 | } | |
1da177e4 | 3481 | |
38308473 | 3482 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3483 | rtm->rtm_flags |= RTM_F_CLONED; |
3484 | ||
3485 | if (dst) { | |
930345ea | 3486 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3487 | goto nla_put_failure; |
1ab1457c | 3488 | rtm->rtm_dst_len = 128; |
1da177e4 | 3489 | } else if (rtm->rtm_dst_len) |
930345ea | 3490 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3491 | goto nla_put_failure; |
1da177e4 LT |
3492 | #ifdef CONFIG_IPV6_SUBTREES |
3493 | if (src) { | |
930345ea | 3494 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3495 | goto nla_put_failure; |
1ab1457c | 3496 | rtm->rtm_src_len = 128; |
c78679e8 | 3497 | } else if (rtm->rtm_src_len && |
930345ea | 3498 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3499 | goto nla_put_failure; |
1da177e4 | 3500 | #endif |
7bc570c8 YH |
3501 | if (iif) { |
3502 | #ifdef CONFIG_IPV6_MROUTE | |
3503 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
fd61c6ba DA |
3504 | int err = ip6mr_get_route(net, skb, rtm, portid); |
3505 | ||
3506 | if (err == 0) | |
3507 | return 0; | |
3508 | if (err < 0) | |
3509 | goto nla_put_failure; | |
7bc570c8 YH |
3510 | } else |
3511 | #endif | |
c78679e8 DM |
3512 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3513 | goto nla_put_failure; | |
7bc570c8 | 3514 | } else if (dst) { |
1da177e4 | 3515 | struct in6_addr saddr_buf; |
c78679e8 | 3516 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3517 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3518 | goto nla_put_failure; |
1da177e4 | 3519 | } |
2d7202bf | 3520 | |
c3968a85 DW |
3521 | if (rt->rt6i_prefsrc.plen) { |
3522 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3523 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3524 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3525 | goto nla_put_failure; |
c3968a85 DW |
3526 | } |
3527 | ||
4b32b5ad MKL |
3528 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3529 | if (rt->rt6i_pmtu) | |
3530 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3531 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3532 | goto nla_put_failure; |
3533 | ||
c78679e8 DM |
3534 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) |
3535 | goto nla_put_failure; | |
8253947e | 3536 | |
beb1afac DA |
3537 | /* For multipath routes, walk the siblings list and add |
3538 | * each as a nexthop within RTA_MULTIPATH. | |
3539 | */ | |
3540 | if (rt->rt6i_nsiblings) { | |
3541 | struct rt6_info *sibling, *next_sibling; | |
3542 | struct nlattr *mp; | |
3543 | ||
3544 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
3545 | if (!mp) | |
3546 | goto nla_put_failure; | |
3547 | ||
3548 | if (rt6_add_nexthop(skb, rt) < 0) | |
3549 | goto nla_put_failure; | |
3550 | ||
3551 | list_for_each_entry_safe(sibling, next_sibling, | |
3552 | &rt->rt6i_siblings, rt6i_siblings) { | |
3553 | if (rt6_add_nexthop(skb, sibling) < 0) | |
3554 | goto nla_put_failure; | |
3555 | } | |
3556 | ||
3557 | nla_nest_end(skb, mp); | |
3558 | } else { | |
5be083ce | 3559 | if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0) |
beb1afac DA |
3560 | goto nla_put_failure; |
3561 | } | |
3562 | ||
8253947e | 3563 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; |
69cdf8f9 | 3564 | |
87a50699 | 3565 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3566 | goto nla_put_failure; |
2d7202bf | 3567 | |
c78ba6d6 LR |
3568 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3569 | goto nla_put_failure; | |
3570 | ||
19e42e45 | 3571 | |
053c095a JB |
3572 | nlmsg_end(skb, nlh); |
3573 | return 0; | |
2d7202bf TG |
3574 | |
3575 | nla_put_failure: | |
26932566 PM |
3576 | nlmsg_cancel(skb, nlh); |
3577 | return -EMSGSIZE; | |
1da177e4 LT |
3578 | } |
3579 | ||
1b43af54 | 3580 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3581 | { |
3582 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1f17e2f2 DA |
3583 | struct net *net = arg->net; |
3584 | ||
3585 | if (rt == net->ipv6.ip6_null_entry) | |
3586 | return 0; | |
1da177e4 | 3587 | |
2d7202bf TG |
3588 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3589 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
f8cfe2ce DA |
3590 | |
3591 | /* user wants prefix routes only */ | |
3592 | if (rtm->rtm_flags & RTM_F_PREFIX && | |
3593 | !(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3594 | /* success since this is not a prefix route */ | |
3595 | return 1; | |
3596 | } | |
3597 | } | |
1da177e4 | 3598 | |
1f17e2f2 | 3599 | return rt6_fill_node(net, |
191cd582 | 3600 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
15e47304 | 3601 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
f8cfe2ce | 3602 | NLM_F_MULTI); |
1da177e4 LT |
3603 | } |
3604 | ||
c21ef3e3 DA |
3605 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
3606 | struct netlink_ext_ack *extack) | |
1da177e4 | 3607 | { |
3b1e0a65 | 3608 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 3609 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c RP |
3610 | int err, iif = 0, oif = 0; |
3611 | struct dst_entry *dst; | |
ab364a6f | 3612 | struct rt6_info *rt; |
1da177e4 | 3613 | struct sk_buff *skb; |
ab364a6f | 3614 | struct rtmsg *rtm; |
4c9483b2 | 3615 | struct flowi6 fl6; |
18c3a61c | 3616 | bool fibmatch; |
1da177e4 | 3617 | |
fceb6435 | 3618 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
c21ef3e3 | 3619 | extack); |
ab364a6f TG |
3620 | if (err < 0) |
3621 | goto errout; | |
1da177e4 | 3622 | |
ab364a6f | 3623 | err = -EINVAL; |
4c9483b2 | 3624 | memset(&fl6, 0, sizeof(fl6)); |
38b7097b HFS |
3625 | rtm = nlmsg_data(nlh); |
3626 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 3627 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 3628 | |
ab364a6f TG |
3629 | if (tb[RTA_SRC]) { |
3630 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3631 | goto errout; | |
3632 | ||
4e3fd7a0 | 3633 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3634 | } |
3635 | ||
3636 | if (tb[RTA_DST]) { | |
3637 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3638 | goto errout; | |
3639 | ||
4e3fd7a0 | 3640 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3641 | } |
3642 | ||
3643 | if (tb[RTA_IIF]) | |
3644 | iif = nla_get_u32(tb[RTA_IIF]); | |
3645 | ||
3646 | if (tb[RTA_OIF]) | |
72331bc0 | 3647 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3648 | |
2e47b291 LC |
3649 | if (tb[RTA_MARK]) |
3650 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3651 | ||
622ec2c9 LC |
3652 | if (tb[RTA_UID]) |
3653 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
3654 | nla_get_u32(tb[RTA_UID])); | |
3655 | else | |
3656 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
3657 | ||
1da177e4 LT |
3658 | if (iif) { |
3659 | struct net_device *dev; | |
72331bc0 SL |
3660 | int flags = 0; |
3661 | ||
5578689a | 3662 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3663 | if (!dev) { |
3664 | err = -ENODEV; | |
ab364a6f | 3665 | goto errout; |
1da177e4 | 3666 | } |
72331bc0 SL |
3667 | |
3668 | fl6.flowi6_iif = iif; | |
3669 | ||
3670 | if (!ipv6_addr_any(&fl6.saddr)) | |
3671 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3672 | ||
18c3a61c RP |
3673 | if (!fibmatch) |
3674 | dst = ip6_route_input_lookup(net, dev, &fl6, flags); | |
72331bc0 SL |
3675 | } else { |
3676 | fl6.flowi6_oif = oif; | |
3677 | ||
18c3a61c RP |
3678 | if (!fibmatch) |
3679 | dst = ip6_route_output(net, NULL, &fl6); | |
3680 | } | |
3681 | ||
3682 | if (fibmatch) | |
3683 | dst = ip6_route_lookup(net, &fl6, 0); | |
3684 | ||
3685 | rt = container_of(dst, struct rt6_info, dst); | |
3686 | if (rt->dst.error) { | |
3687 | err = rt->dst.error; | |
3688 | ip6_rt_put(rt); | |
3689 | goto errout; | |
1da177e4 LT |
3690 | } |
3691 | ||
9d6acb3b WC |
3692 | if (rt == net->ipv6.ip6_null_entry) { |
3693 | err = rt->dst.error; | |
3694 | ip6_rt_put(rt); | |
3695 | goto errout; | |
3696 | } | |
3697 | ||
ab364a6f | 3698 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3699 | if (!skb) { |
94e187c0 | 3700 | ip6_rt_put(rt); |
ab364a6f TG |
3701 | err = -ENOBUFS; |
3702 | goto errout; | |
3703 | } | |
1da177e4 | 3704 | |
d8d1f30b | 3705 | skb_dst_set(skb, &rt->dst); |
18c3a61c RP |
3706 | if (fibmatch) |
3707 | err = rt6_fill_node(net, skb, rt, NULL, NULL, iif, | |
3708 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, | |
3709 | nlh->nlmsg_seq, 0); | |
3710 | else | |
3711 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, | |
3712 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, | |
3713 | nlh->nlmsg_seq, 0); | |
1da177e4 | 3714 | if (err < 0) { |
ab364a6f TG |
3715 | kfree_skb(skb); |
3716 | goto errout; | |
1da177e4 LT |
3717 | } |
3718 | ||
15e47304 | 3719 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3720 | errout: |
1da177e4 | 3721 | return err; |
1da177e4 LT |
3722 | } |
3723 | ||
37a1d361 RP |
3724 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3725 | unsigned int nlm_flags) | |
1da177e4 LT |
3726 | { |
3727 | struct sk_buff *skb; | |
5578689a | 3728 | struct net *net = info->nl_net; |
528c4ceb DL |
3729 | u32 seq; |
3730 | int err; | |
3731 | ||
3732 | err = -ENOBUFS; | |
38308473 | 3733 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3734 | |
19e42e45 | 3735 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3736 | if (!skb) |
21713ebc TG |
3737 | goto errout; |
3738 | ||
191cd582 | 3739 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
f8cfe2ce | 3740 | event, info->portid, seq, nlm_flags); |
26932566 PM |
3741 | if (err < 0) { |
3742 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3743 | WARN_ON(err == -EMSGSIZE); | |
3744 | kfree_skb(skb); | |
3745 | goto errout; | |
3746 | } | |
15e47304 | 3747 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3748 | info->nlh, gfp_any()); |
3749 | return; | |
21713ebc TG |
3750 | errout: |
3751 | if (err < 0) | |
5578689a | 3752 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3753 | } |
3754 | ||
8ed67789 | 3755 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3756 | unsigned long event, void *ptr) |
8ed67789 | 3757 | { |
351638e7 | 3758 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3759 | struct net *net = dev_net(dev); |
8ed67789 | 3760 | |
242d3a49 WC |
3761 | if (!(dev->flags & IFF_LOOPBACK)) |
3762 | return NOTIFY_OK; | |
3763 | ||
3764 | if (event == NETDEV_REGISTER) { | |
d8d1f30b | 3765 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3766 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3767 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3768 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3769 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3770 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 3771 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 WC |
3772 | #endif |
3773 | } else if (event == NETDEV_UNREGISTER) { | |
3774 | in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev); | |
3775 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3776 | in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev); | |
3777 | in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
3778 | #endif |
3779 | } | |
3780 | ||
3781 | return NOTIFY_OK; | |
3782 | } | |
3783 | ||
1da177e4 LT |
3784 | /* |
3785 | * /proc | |
3786 | */ | |
3787 | ||
3788 | #ifdef CONFIG_PROC_FS | |
3789 | ||
33120b30 AD |
3790 | static const struct file_operations ipv6_route_proc_fops = { |
3791 | .owner = THIS_MODULE, | |
3792 | .open = ipv6_route_open, | |
3793 | .read = seq_read, | |
3794 | .llseek = seq_lseek, | |
8d2ca1d7 | 3795 | .release = seq_release_net, |
33120b30 AD |
3796 | }; |
3797 | ||
1da177e4 LT |
3798 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3799 | { | |
69ddb805 | 3800 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3801 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3802 | net->ipv6.rt6_stats->fib_nodes, |
3803 | net->ipv6.rt6_stats->fib_route_nodes, | |
3804 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3805 | net->ipv6.rt6_stats->fib_rt_entries, | |
3806 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3807 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3808 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3809 | |
3810 | return 0; | |
3811 | } | |
3812 | ||
3813 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3814 | { | |
de05c557 | 3815 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3816 | } |
3817 | ||
9a32144e | 3818 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3819 | .owner = THIS_MODULE, |
3820 | .open = rt6_stats_seq_open, | |
3821 | .read = seq_read, | |
3822 | .llseek = seq_lseek, | |
b6fcbdb4 | 3823 | .release = single_release_net, |
1da177e4 LT |
3824 | }; |
3825 | #endif /* CONFIG_PROC_FS */ | |
3826 | ||
3827 | #ifdef CONFIG_SYSCTL | |
3828 | ||
1da177e4 | 3829 | static |
fe2c6338 | 3830 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3831 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3832 | { | |
c486da34 LAG |
3833 | struct net *net; |
3834 | int delay; | |
3835 | if (!write) | |
1da177e4 | 3836 | return -EINVAL; |
c486da34 LAG |
3837 | |
3838 | net = (struct net *)ctl->extra1; | |
3839 | delay = net->ipv6.sysctl.flush_delay; | |
3840 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3841 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3842 | return 0; |
1da177e4 LT |
3843 | } |
3844 | ||
fe2c6338 | 3845 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3846 | { |
1da177e4 | 3847 | .procname = "flush", |
4990509f | 3848 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3849 | .maxlen = sizeof(int), |
89c8b3a1 | 3850 | .mode = 0200, |
6d9f239a | 3851 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3852 | }, |
3853 | { | |
1da177e4 | 3854 | .procname = "gc_thresh", |
9a7ec3a9 | 3855 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3856 | .maxlen = sizeof(int), |
3857 | .mode = 0644, | |
6d9f239a | 3858 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3859 | }, |
3860 | { | |
1da177e4 | 3861 | .procname = "max_size", |
4990509f | 3862 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3863 | .maxlen = sizeof(int), |
3864 | .mode = 0644, | |
6d9f239a | 3865 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3866 | }, |
3867 | { | |
1da177e4 | 3868 | .procname = "gc_min_interval", |
4990509f | 3869 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3870 | .maxlen = sizeof(int), |
3871 | .mode = 0644, | |
6d9f239a | 3872 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3873 | }, |
3874 | { | |
1da177e4 | 3875 | .procname = "gc_timeout", |
4990509f | 3876 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3877 | .maxlen = sizeof(int), |
3878 | .mode = 0644, | |
6d9f239a | 3879 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3880 | }, |
3881 | { | |
1da177e4 | 3882 | .procname = "gc_interval", |
4990509f | 3883 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3884 | .maxlen = sizeof(int), |
3885 | .mode = 0644, | |
6d9f239a | 3886 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3887 | }, |
3888 | { | |
1da177e4 | 3889 | .procname = "gc_elasticity", |
4990509f | 3890 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3891 | .maxlen = sizeof(int), |
3892 | .mode = 0644, | |
f3d3f616 | 3893 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3894 | }, |
3895 | { | |
1da177e4 | 3896 | .procname = "mtu_expires", |
4990509f | 3897 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3898 | .maxlen = sizeof(int), |
3899 | .mode = 0644, | |
6d9f239a | 3900 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3901 | }, |
3902 | { | |
1da177e4 | 3903 | .procname = "min_adv_mss", |
4990509f | 3904 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3905 | .maxlen = sizeof(int), |
3906 | .mode = 0644, | |
f3d3f616 | 3907 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3908 | }, |
3909 | { | |
1da177e4 | 3910 | .procname = "gc_min_interval_ms", |
4990509f | 3911 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3912 | .maxlen = sizeof(int), |
3913 | .mode = 0644, | |
6d9f239a | 3914 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3915 | }, |
f8572d8f | 3916 | { } |
1da177e4 LT |
3917 | }; |
3918 | ||
2c8c1e72 | 3919 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3920 | { |
3921 | struct ctl_table *table; | |
3922 | ||
3923 | table = kmemdup(ipv6_route_table_template, | |
3924 | sizeof(ipv6_route_table_template), | |
3925 | GFP_KERNEL); | |
5ee09105 YH |
3926 | |
3927 | if (table) { | |
3928 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3929 | table[0].extra1 = net; |
86393e52 | 3930 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3931 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3932 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3933 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3934 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3935 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3936 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3937 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3938 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3939 | |
3940 | /* Don't export sysctls to unprivileged users */ | |
3941 | if (net->user_ns != &init_user_ns) | |
3942 | table[0].procname = NULL; | |
5ee09105 YH |
3943 | } |
3944 | ||
760f2d01 DL |
3945 | return table; |
3946 | } | |
1da177e4 LT |
3947 | #endif |
3948 | ||
2c8c1e72 | 3949 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3950 | { |
633d424b | 3951 | int ret = -ENOMEM; |
8ed67789 | 3952 | |
86393e52 AD |
3953 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3954 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3955 | |
fc66f95c ED |
3956 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3957 | goto out_ip6_dst_ops; | |
3958 | ||
8ed67789 DL |
3959 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3960 | sizeof(*net->ipv6.ip6_null_entry), | |
3961 | GFP_KERNEL); | |
3962 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3963 | goto out_ip6_dst_entries; |
d8d1f30b | 3964 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3965 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3966 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3967 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3968 | ip6_template_metrics, true); | |
8ed67789 DL |
3969 | |
3970 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3971 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3972 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3973 | GFP_KERNEL); | |
68fffc67 PZ |
3974 | if (!net->ipv6.ip6_prohibit_entry) |
3975 | goto out_ip6_null_entry; | |
d8d1f30b | 3976 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3977 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3978 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3979 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3980 | ip6_template_metrics, true); | |
8ed67789 DL |
3981 | |
3982 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3983 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3984 | GFP_KERNEL); | |
68fffc67 PZ |
3985 | if (!net->ipv6.ip6_blk_hole_entry) |
3986 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3987 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3988 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3989 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3990 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3991 | ip6_template_metrics, true); | |
8ed67789 DL |
3992 | #endif |
3993 | ||
b339a47c PZ |
3994 | net->ipv6.sysctl.flush_delay = 0; |
3995 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3996 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3997 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3998 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3999 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
4000 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
4001 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
4002 | ||
6891a346 BT |
4003 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
4004 | ||
8ed67789 DL |
4005 | ret = 0; |
4006 | out: | |
4007 | return ret; | |
f2fc6a54 | 4008 | |
68fffc67 PZ |
4009 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
4010 | out_ip6_prohibit_entry: | |
4011 | kfree(net->ipv6.ip6_prohibit_entry); | |
4012 | out_ip6_null_entry: | |
4013 | kfree(net->ipv6.ip6_null_entry); | |
4014 | #endif | |
fc66f95c ED |
4015 | out_ip6_dst_entries: |
4016 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 4017 | out_ip6_dst_ops: |
f2fc6a54 | 4018 | goto out; |
cdb18761 DL |
4019 | } |
4020 | ||
2c8c1e72 | 4021 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 4022 | { |
8ed67789 DL |
4023 | kfree(net->ipv6.ip6_null_entry); |
4024 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
4025 | kfree(net->ipv6.ip6_prohibit_entry); | |
4026 | kfree(net->ipv6.ip6_blk_hole_entry); | |
4027 | #endif | |
41bb78b4 | 4028 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
4029 | } |
4030 | ||
d189634e TG |
4031 | static int __net_init ip6_route_net_init_late(struct net *net) |
4032 | { | |
4033 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
4034 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
4035 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
4036 | #endif |
4037 | return 0; | |
4038 | } | |
4039 | ||
4040 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
4041 | { | |
4042 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
4043 | remove_proc_entry("ipv6_route", net->proc_net); |
4044 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
4045 | #endif |
4046 | } | |
4047 | ||
cdb18761 DL |
4048 | static struct pernet_operations ip6_route_net_ops = { |
4049 | .init = ip6_route_net_init, | |
4050 | .exit = ip6_route_net_exit, | |
4051 | }; | |
4052 | ||
c3426b47 DM |
4053 | static int __net_init ipv6_inetpeer_init(struct net *net) |
4054 | { | |
4055 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
4056 | ||
4057 | if (!bp) | |
4058 | return -ENOMEM; | |
4059 | inet_peer_base_init(bp); | |
4060 | net->ipv6.peers = bp; | |
4061 | return 0; | |
4062 | } | |
4063 | ||
4064 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
4065 | { | |
4066 | struct inet_peer_base *bp = net->ipv6.peers; | |
4067 | ||
4068 | net->ipv6.peers = NULL; | |
56a6b248 | 4069 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
4070 | kfree(bp); |
4071 | } | |
4072 | ||
2b823f72 | 4073 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
4074 | .init = ipv6_inetpeer_init, |
4075 | .exit = ipv6_inetpeer_exit, | |
4076 | }; | |
4077 | ||
d189634e TG |
4078 | static struct pernet_operations ip6_route_net_late_ops = { |
4079 | .init = ip6_route_net_init_late, | |
4080 | .exit = ip6_route_net_exit_late, | |
4081 | }; | |
4082 | ||
8ed67789 DL |
4083 | static struct notifier_block ip6_route_dev_notifier = { |
4084 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 4085 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
4086 | }; |
4087 | ||
2f460933 WC |
4088 | void __init ip6_route_init_special_entries(void) |
4089 | { | |
4090 | /* Registering of the loopback is done before this portion of code, | |
4091 | * the loopback reference in rt6_info will not be taken, do it | |
4092 | * manually for init_net */ | |
4093 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; | |
4094 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4095 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
4096 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
4097 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4098 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
4099 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4100 | #endif | |
4101 | } | |
4102 | ||
433d49c3 | 4103 | int __init ip6_route_init(void) |
1da177e4 | 4104 | { |
433d49c3 | 4105 | int ret; |
8d0b94af | 4106 | int cpu; |
433d49c3 | 4107 | |
9a7ec3a9 DL |
4108 | ret = -ENOMEM; |
4109 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 4110 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 4111 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 4112 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 4113 | goto out; |
14e50e57 | 4114 | |
fc66f95c | 4115 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 4116 | if (ret) |
bdb3289f | 4117 | goto out_kmem_cache; |
bdb3289f | 4118 | |
c3426b47 DM |
4119 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
4120 | if (ret) | |
e8803b6c | 4121 | goto out_dst_entries; |
2a0c451a | 4122 | |
7e52b33b DM |
4123 | ret = register_pernet_subsys(&ip6_route_net_ops); |
4124 | if (ret) | |
4125 | goto out_register_inetpeer; | |
c3426b47 | 4126 | |
5dc121e9 AE |
4127 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
4128 | ||
e8803b6c | 4129 | ret = fib6_init(); |
433d49c3 | 4130 | if (ret) |
8ed67789 | 4131 | goto out_register_subsys; |
433d49c3 | 4132 | |
433d49c3 DL |
4133 | ret = xfrm6_init(); |
4134 | if (ret) | |
e8803b6c | 4135 | goto out_fib6_init; |
c35b7e72 | 4136 | |
433d49c3 DL |
4137 | ret = fib6_rules_init(); |
4138 | if (ret) | |
4139 | goto xfrm6_init; | |
7e5449c2 | 4140 | |
d189634e TG |
4141 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
4142 | if (ret) | |
4143 | goto fib6_rules_init; | |
4144 | ||
433d49c3 | 4145 | ret = -ENOBUFS; |
c7ac8679 GR |
4146 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
4147 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
4148 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 4149 | goto out_register_late_subsys; |
c127ea2c | 4150 | |
8ed67789 | 4151 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 4152 | if (ret) |
d189634e | 4153 | goto out_register_late_subsys; |
8ed67789 | 4154 | |
8d0b94af MKL |
4155 | for_each_possible_cpu(cpu) { |
4156 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
4157 | ||
4158 | INIT_LIST_HEAD(&ul->head); | |
4159 | spin_lock_init(&ul->lock); | |
4160 | } | |
4161 | ||
433d49c3 DL |
4162 | out: |
4163 | return ret; | |
4164 | ||
d189634e TG |
4165 | out_register_late_subsys: |
4166 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 4167 | fib6_rules_init: |
433d49c3 DL |
4168 | fib6_rules_cleanup(); |
4169 | xfrm6_init: | |
433d49c3 | 4170 | xfrm6_fini(); |
2a0c451a TG |
4171 | out_fib6_init: |
4172 | fib6_gc_cleanup(); | |
8ed67789 DL |
4173 | out_register_subsys: |
4174 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
4175 | out_register_inetpeer: |
4176 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
4177 | out_dst_entries: |
4178 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 4179 | out_kmem_cache: |
f2fc6a54 | 4180 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 4181 | goto out; |
1da177e4 LT |
4182 | } |
4183 | ||
4184 | void ip6_route_cleanup(void) | |
4185 | { | |
8ed67789 | 4186 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 4187 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 4188 | fib6_rules_cleanup(); |
1da177e4 | 4189 | xfrm6_fini(); |
1da177e4 | 4190 | fib6_gc_cleanup(); |
c3426b47 | 4191 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 4192 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 4193 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 4194 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 4195 | } |