Commit | Line | Data |
---|---|---|
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> | |
57 | #include <net/xfrm.h> | |
8d71740c | 58 | #include <net/netevent.h> |
21713ebc | 59 | #include <net/netlink.h> |
51ebd318 | 60 | #include <net/nexthop.h> |
1da177e4 LT |
61 | |
62 | #include <asm/uaccess.h> | |
63 | ||
64 | #ifdef CONFIG_SYSCTL | |
65 | #include <linux/sysctl.h> | |
66 | #endif | |
67 | ||
afc154e9 | 68 | enum rt6_nud_state { |
7e980569 JB |
69 | RT6_NUD_FAIL_HARD = -3, |
70 | RT6_NUD_FAIL_PROBE = -2, | |
71 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
72 | RT6_NUD_SUCCEED = 1 |
73 | }; | |
74 | ||
83a09abd | 75 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 76 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 77 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 78 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
aad88724 | 86 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb); |
7150aede | 87 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
aad88724 | 88 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 89 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
90 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
91 | struct sk_buff *skb, u32 mtu); | |
92 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
93 | struct sk_buff *skb); | |
4b32b5ad | 94 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 95 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 96 | |
70ceb4f5 | 97 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 98 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
99 | const struct in6_addr *prefix, int prefixlen, |
100 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 101 | unsigned int pref); |
efa2cea0 | 102 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
103 | const struct in6_addr *prefix, int prefixlen, |
104 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
105 | #endif |
106 | ||
8d0b94af MKL |
107 | struct uncached_list { |
108 | spinlock_t lock; | |
109 | struct list_head head; | |
110 | }; | |
111 | ||
112 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
113 | ||
114 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
115 | { | |
116 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
117 | ||
118 | rt->dst.flags |= DST_NOCACHE; | |
119 | rt->rt6i_uncached_list = ul; | |
120 | ||
121 | spin_lock_bh(&ul->lock); | |
122 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
123 | spin_unlock_bh(&ul->lock); | |
124 | } | |
125 | ||
126 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
127 | { | |
128 | if (!list_empty(&rt->rt6i_uncached)) { | |
129 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
130 | ||
131 | spin_lock_bh(&ul->lock); | |
132 | list_del(&rt->rt6i_uncached); | |
133 | spin_unlock_bh(&ul->lock); | |
134 | } | |
135 | } | |
136 | ||
137 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
138 | { | |
139 | struct net_device *loopback_dev = net->loopback_dev; | |
140 | int cpu; | |
141 | ||
142 | for_each_possible_cpu(cpu) { | |
143 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
144 | struct rt6_info *rt; | |
145 | ||
146 | spin_lock_bh(&ul->lock); | |
147 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
148 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
149 | struct net_device *rt_dev = rt->dst.dev; | |
150 | ||
151 | if (rt_idev && (rt_idev->dev == dev || !dev) && | |
152 | rt_idev->dev != loopback_dev) { | |
153 | rt->rt6i_idev = in6_dev_get(loopback_dev); | |
154 | in6_dev_put(rt_idev); | |
155 | } | |
156 | ||
157 | if (rt_dev && (rt_dev == dev || !dev) && | |
158 | rt_dev != loopback_dev) { | |
159 | rt->dst.dev = loopback_dev; | |
160 | dev_hold(rt->dst.dev); | |
161 | dev_put(rt_dev); | |
162 | } | |
163 | } | |
164 | spin_unlock_bh(&ul->lock); | |
165 | } | |
166 | } | |
167 | ||
d52d3997 MKL |
168 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
169 | { | |
170 | return dst_metrics_write_ptr(rt->dst.from); | |
171 | } | |
172 | ||
06582540 DM |
173 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
174 | { | |
4b32b5ad | 175 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 176 | |
d52d3997 MKL |
177 | if (rt->rt6i_flags & RTF_PCPU) |
178 | return rt6_pcpu_cow_metrics(rt); | |
179 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
180 | return NULL; |
181 | else | |
3b471175 | 182 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
183 | } |
184 | ||
f894cbf8 DM |
185 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
186 | struct sk_buff *skb, | |
187 | const void *daddr) | |
39232973 DM |
188 | { |
189 | struct in6_addr *p = &rt->rt6i_gateway; | |
190 | ||
a7563f34 | 191 | if (!ipv6_addr_any(p)) |
39232973 | 192 | return (const void *) p; |
f894cbf8 DM |
193 | else if (skb) |
194 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
195 | return daddr; |
196 | } | |
197 | ||
f894cbf8 DM |
198 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
199 | struct sk_buff *skb, | |
200 | const void *daddr) | |
d3aaeb38 | 201 | { |
39232973 DM |
202 | struct rt6_info *rt = (struct rt6_info *) dst; |
203 | struct neighbour *n; | |
204 | ||
f894cbf8 | 205 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 206 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
207 | if (n) |
208 | return n; | |
209 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
210 | } | |
211 | ||
9a7ec3a9 | 212 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 213 | .family = AF_INET6, |
1da177e4 LT |
214 | .gc = ip6_dst_gc, |
215 | .gc_thresh = 1024, | |
216 | .check = ip6_dst_check, | |
0dbaee3b | 217 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 218 | .mtu = ip6_mtu, |
06582540 | 219 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
220 | .destroy = ip6_dst_destroy, |
221 | .ifdown = ip6_dst_ifdown, | |
222 | .negative_advice = ip6_negative_advice, | |
223 | .link_failure = ip6_link_failure, | |
224 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 225 | .redirect = rt6_do_redirect, |
1ac06e03 | 226 | .local_out = __ip6_local_out, |
d3aaeb38 | 227 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
228 | }; |
229 | ||
ebb762f2 | 230 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 231 | { |
618f9bc7 SK |
232 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
233 | ||
234 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
235 | } |
236 | ||
6700c270 DM |
237 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
238 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
239 | { |
240 | } | |
241 | ||
6700c270 DM |
242 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
243 | struct sk_buff *skb) | |
b587ee3b DM |
244 | { |
245 | } | |
246 | ||
0972ddb2 HB |
247 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
248 | unsigned long old) | |
249 | { | |
250 | return NULL; | |
251 | } | |
252 | ||
14e50e57 DM |
253 | static struct dst_ops ip6_dst_blackhole_ops = { |
254 | .family = AF_INET6, | |
14e50e57 DM |
255 | .destroy = ip6_dst_destroy, |
256 | .check = ip6_dst_check, | |
ebb762f2 | 257 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 258 | .default_advmss = ip6_default_advmss, |
14e50e57 | 259 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 260 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 261 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 262 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
263 | }; |
264 | ||
62fa8a84 | 265 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 266 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
267 | }; |
268 | ||
fb0af4c7 | 269 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
270 | .dst = { |
271 | .__refcnt = ATOMIC_INIT(1), | |
272 | .__use = 1, | |
2c20cbd7 | 273 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 274 | .error = -ENETUNREACH, |
d8d1f30b CG |
275 | .input = ip6_pkt_discard, |
276 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
277 | }, |
278 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 279 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
280 | .rt6i_metric = ~(u32) 0, |
281 | .rt6i_ref = ATOMIC_INIT(1), | |
282 | }; | |
283 | ||
101367c2 TG |
284 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
285 | ||
fb0af4c7 | 286 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
287 | .dst = { |
288 | .__refcnt = ATOMIC_INIT(1), | |
289 | .__use = 1, | |
2c20cbd7 | 290 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 291 | .error = -EACCES, |
d8d1f30b CG |
292 | .input = ip6_pkt_prohibit, |
293 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
294 | }, |
295 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 296 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
297 | .rt6i_metric = ~(u32) 0, |
298 | .rt6i_ref = ATOMIC_INIT(1), | |
299 | }; | |
300 | ||
fb0af4c7 | 301 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
302 | .dst = { |
303 | .__refcnt = ATOMIC_INIT(1), | |
304 | .__use = 1, | |
2c20cbd7 | 305 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 306 | .error = -EINVAL, |
d8d1f30b | 307 | .input = dst_discard, |
aad88724 | 308 | .output = dst_discard_sk, |
101367c2 TG |
309 | }, |
310 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 311 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
312 | .rt6i_metric = ~(u32) 0, |
313 | .rt6i_ref = ATOMIC_INIT(1), | |
314 | }; | |
315 | ||
316 | #endif | |
317 | ||
1da177e4 | 318 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
319 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
320 | struct net_device *dev, | |
321 | int flags, | |
322 | struct fib6_table *table) | |
1da177e4 | 323 | { |
97bab73f | 324 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 325 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 326 | |
97bab73f | 327 | if (rt) { |
8104891b SK |
328 | struct dst_entry *dst = &rt->dst; |
329 | ||
330 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
51ebd318 | 331 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
8d0b94af | 332 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
97bab73f | 333 | } |
cf911662 | 334 | return rt; |
1da177e4 LT |
335 | } |
336 | ||
d52d3997 MKL |
337 | static struct rt6_info *ip6_dst_alloc(struct net *net, |
338 | struct net_device *dev, | |
339 | int flags, | |
340 | struct fib6_table *table) | |
341 | { | |
342 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags, table); | |
343 | ||
344 | if (rt) { | |
345 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
346 | if (rt->rt6i_pcpu) { | |
347 | int cpu; | |
348 | ||
349 | for_each_possible_cpu(cpu) { | |
350 | struct rt6_info **p; | |
351 | ||
352 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
353 | /* no one shares rt */ | |
354 | *p = NULL; | |
355 | } | |
356 | } else { | |
357 | dst_destroy((struct dst_entry *)rt); | |
358 | return NULL; | |
359 | } | |
360 | } | |
361 | ||
362 | return rt; | |
363 | } | |
364 | ||
1da177e4 LT |
365 | static void ip6_dst_destroy(struct dst_entry *dst) |
366 | { | |
367 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 368 | struct dst_entry *from = dst->from; |
8d0b94af | 369 | struct inet6_dev *idev; |
1da177e4 | 370 | |
4b32b5ad | 371 | dst_destroy_metrics_generic(dst); |
8e2ec639 | 372 | |
d52d3997 MKL |
373 | if (rt->rt6i_pcpu) |
374 | free_percpu(rt->rt6i_pcpu); | |
375 | ||
8d0b94af MKL |
376 | rt6_uncached_list_del(rt); |
377 | ||
378 | idev = rt->rt6i_idev; | |
38308473 | 379 | if (idev) { |
1da177e4 LT |
380 | rt->rt6i_idev = NULL; |
381 | in6_dev_put(idev); | |
1ab1457c | 382 | } |
1716a961 | 383 | |
ecd98837 YH |
384 | dst->from = NULL; |
385 | dst_release(from); | |
b3419363 DM |
386 | } |
387 | ||
1da177e4 LT |
388 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
389 | int how) | |
390 | { | |
391 | struct rt6_info *rt = (struct rt6_info *)dst; | |
392 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 393 | struct net_device *loopback_dev = |
c346dca1 | 394 | dev_net(dev)->loopback_dev; |
1da177e4 | 395 | |
97cac082 DM |
396 | if (dev != loopback_dev) { |
397 | if (idev && idev->dev == dev) { | |
398 | struct inet6_dev *loopback_idev = | |
399 | in6_dev_get(loopback_dev); | |
400 | if (loopback_idev) { | |
401 | rt->rt6i_idev = loopback_idev; | |
402 | in6_dev_put(idev); | |
403 | } | |
404 | } | |
1da177e4 LT |
405 | } |
406 | } | |
407 | ||
a50feda5 | 408 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 409 | { |
1716a961 G |
410 | if (rt->rt6i_flags & RTF_EXPIRES) { |
411 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 412 | return true; |
1716a961 | 413 | } else if (rt->dst.from) { |
3fd91fb3 | 414 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 415 | } |
a50feda5 | 416 | return false; |
1da177e4 LT |
417 | } |
418 | ||
51ebd318 ND |
419 | /* Multipath route selection: |
420 | * Hash based function using packet header and flowlabel. | |
421 | * Adapted from fib_info_hashfn() | |
422 | */ | |
423 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
424 | const struct flowi6 *fl6) | |
425 | { | |
426 | unsigned int val = fl6->flowi6_proto; | |
427 | ||
c08977bb YH |
428 | val ^= ipv6_addr_hash(&fl6->daddr); |
429 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
430 | |
431 | /* Work only if this not encapsulated */ | |
432 | switch (fl6->flowi6_proto) { | |
433 | case IPPROTO_UDP: | |
434 | case IPPROTO_TCP: | |
435 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
436 | val ^= (__force u16)fl6->fl6_sport; |
437 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
438 | break; |
439 | ||
440 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
441 | val ^= (__force u16)fl6->fl6_icmp_type; |
442 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
443 | break; |
444 | } | |
445 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 446 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
447 | |
448 | /* Perhaps, we need to tune, this function? */ | |
449 | val = val ^ (val >> 7) ^ (val >> 12); | |
450 | return val % candidate_count; | |
451 | } | |
452 | ||
453 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
454 | struct flowi6 *fl6, int oif, |
455 | int strict) | |
51ebd318 ND |
456 | { |
457 | struct rt6_info *sibling, *next_sibling; | |
458 | int route_choosen; | |
459 | ||
460 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
461 | /* Don't change the route, if route_choosen == 0 | |
462 | * (siblings does not include ourself) | |
463 | */ | |
464 | if (route_choosen) | |
465 | list_for_each_entry_safe(sibling, next_sibling, | |
466 | &match->rt6i_siblings, rt6i_siblings) { | |
467 | route_choosen--; | |
468 | if (route_choosen == 0) { | |
52bd4c0c ND |
469 | if (rt6_score_route(sibling, oif, strict) < 0) |
470 | break; | |
51ebd318 ND |
471 | match = sibling; |
472 | break; | |
473 | } | |
474 | } | |
475 | return match; | |
476 | } | |
477 | ||
1da177e4 | 478 | /* |
c71099ac | 479 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
480 | */ |
481 | ||
8ed67789 DL |
482 | static inline struct rt6_info *rt6_device_match(struct net *net, |
483 | struct rt6_info *rt, | |
b71d1d42 | 484 | const struct in6_addr *saddr, |
1da177e4 | 485 | int oif, |
d420895e | 486 | int flags) |
1da177e4 LT |
487 | { |
488 | struct rt6_info *local = NULL; | |
489 | struct rt6_info *sprt; | |
490 | ||
dd3abc4e YH |
491 | if (!oif && ipv6_addr_any(saddr)) |
492 | goto out; | |
493 | ||
d8d1f30b | 494 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 495 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
496 | |
497 | if (oif) { | |
1da177e4 LT |
498 | if (dev->ifindex == oif) |
499 | return sprt; | |
500 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 501 | if (!sprt->rt6i_idev || |
1da177e4 | 502 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 503 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 504 | continue; |
1ab1457c | 505 | if (local && (!oif || |
1da177e4 LT |
506 | local->rt6i_idev->dev->ifindex == oif)) |
507 | continue; | |
508 | } | |
509 | local = sprt; | |
510 | } | |
dd3abc4e YH |
511 | } else { |
512 | if (ipv6_chk_addr(net, saddr, dev, | |
513 | flags & RT6_LOOKUP_F_IFACE)) | |
514 | return sprt; | |
1da177e4 | 515 | } |
dd3abc4e | 516 | } |
1da177e4 | 517 | |
dd3abc4e | 518 | if (oif) { |
1da177e4 LT |
519 | if (local) |
520 | return local; | |
521 | ||
d420895e | 522 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 523 | return net->ipv6.ip6_null_entry; |
1da177e4 | 524 | } |
dd3abc4e | 525 | out: |
1da177e4 LT |
526 | return rt; |
527 | } | |
528 | ||
27097255 | 529 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
530 | struct __rt6_probe_work { |
531 | struct work_struct work; | |
532 | struct in6_addr target; | |
533 | struct net_device *dev; | |
534 | }; | |
535 | ||
536 | static void rt6_probe_deferred(struct work_struct *w) | |
537 | { | |
538 | struct in6_addr mcaddr; | |
539 | struct __rt6_probe_work *work = | |
540 | container_of(w, struct __rt6_probe_work, work); | |
541 | ||
542 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
543 | ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); | |
544 | dev_put(work->dev); | |
662f5533 | 545 | kfree(work); |
c2f17e82 HFS |
546 | } |
547 | ||
27097255 YH |
548 | static void rt6_probe(struct rt6_info *rt) |
549 | { | |
f2c31e32 | 550 | struct neighbour *neigh; |
27097255 YH |
551 | /* |
552 | * Okay, this does not seem to be appropriate | |
553 | * for now, however, we need to check if it | |
554 | * is really so; aka Router Reachability Probing. | |
555 | * | |
556 | * Router Reachability Probe MUST be rate-limited | |
557 | * to no more than one per minute. | |
558 | */ | |
2152caea | 559 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 560 | return; |
2152caea YH |
561 | rcu_read_lock_bh(); |
562 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
563 | if (neigh) { | |
564 | write_lock(&neigh->lock); | |
565 | if (neigh->nud_state & NUD_VALID) | |
566 | goto out; | |
7ff74a59 | 567 | } |
2152caea YH |
568 | |
569 | if (!neigh || | |
52e16356 | 570 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
c2f17e82 | 571 | struct __rt6_probe_work *work; |
27097255 | 572 | |
c2f17e82 HFS |
573 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
574 | ||
575 | if (neigh && work) | |
7e980569 | 576 | __neigh_set_probe_once(neigh); |
c2f17e82 HFS |
577 | |
578 | if (neigh) | |
2152caea YH |
579 | write_unlock(&neigh->lock); |
580 | ||
c2f17e82 HFS |
581 | if (work) { |
582 | INIT_WORK(&work->work, rt6_probe_deferred); | |
583 | work->target = rt->rt6i_gateway; | |
584 | dev_hold(rt->dst.dev); | |
585 | work->dev = rt->dst.dev; | |
586 | schedule_work(&work->work); | |
587 | } | |
f2c31e32 | 588 | } else { |
2152caea YH |
589 | out: |
590 | write_unlock(&neigh->lock); | |
f2c31e32 | 591 | } |
2152caea | 592 | rcu_read_unlock_bh(); |
27097255 YH |
593 | } |
594 | #else | |
595 | static inline void rt6_probe(struct rt6_info *rt) | |
596 | { | |
27097255 YH |
597 | } |
598 | #endif | |
599 | ||
1da177e4 | 600 | /* |
554cfb7e | 601 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 602 | */ |
b6f99a21 | 603 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 604 | { |
d1918542 | 605 | struct net_device *dev = rt->dst.dev; |
161980f4 | 606 | if (!oif || dev->ifindex == oif) |
554cfb7e | 607 | return 2; |
161980f4 DM |
608 | if ((dev->flags & IFF_LOOPBACK) && |
609 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
610 | return 1; | |
611 | return 0; | |
554cfb7e | 612 | } |
1da177e4 | 613 | |
afc154e9 | 614 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 615 | { |
f2c31e32 | 616 | struct neighbour *neigh; |
afc154e9 | 617 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 618 | |
4d0c5911 YH |
619 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
620 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 621 | return RT6_NUD_SUCCEED; |
145a3621 YH |
622 | |
623 | rcu_read_lock_bh(); | |
624 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
625 | if (neigh) { | |
626 | read_lock(&neigh->lock); | |
554cfb7e | 627 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 628 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 629 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 630 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 631 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
632 | else |
633 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 634 | #endif |
145a3621 | 635 | read_unlock(&neigh->lock); |
afc154e9 HFS |
636 | } else { |
637 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 638 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 639 | } |
145a3621 YH |
640 | rcu_read_unlock_bh(); |
641 | ||
a5a81f0b | 642 | return ret; |
1da177e4 LT |
643 | } |
644 | ||
554cfb7e YH |
645 | static int rt6_score_route(struct rt6_info *rt, int oif, |
646 | int strict) | |
1da177e4 | 647 | { |
a5a81f0b | 648 | int m; |
1ab1457c | 649 | |
4d0c5911 | 650 | m = rt6_check_dev(rt, oif); |
77d16f45 | 651 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 652 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
653 | #ifdef CONFIG_IPV6_ROUTER_PREF |
654 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
655 | #endif | |
afc154e9 HFS |
656 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
657 | int n = rt6_check_neigh(rt); | |
658 | if (n < 0) | |
659 | return n; | |
660 | } | |
554cfb7e YH |
661 | return m; |
662 | } | |
663 | ||
f11e6659 | 664 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
665 | int *mpri, struct rt6_info *match, |
666 | bool *do_rr) | |
554cfb7e | 667 | { |
f11e6659 | 668 | int m; |
afc154e9 | 669 | bool match_do_rr = false; |
f11e6659 DM |
670 | |
671 | if (rt6_check_expired(rt)) | |
672 | goto out; | |
673 | ||
674 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 675 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
676 | match_do_rr = true; |
677 | m = 0; /* lowest valid score */ | |
7e980569 | 678 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 679 | goto out; |
afc154e9 HFS |
680 | } |
681 | ||
682 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
683 | rt6_probe(rt); | |
f11e6659 | 684 | |
7e980569 | 685 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 686 | if (m > *mpri) { |
afc154e9 | 687 | *do_rr = match_do_rr; |
f11e6659 DM |
688 | *mpri = m; |
689 | match = rt; | |
f11e6659 | 690 | } |
f11e6659 DM |
691 | out: |
692 | return match; | |
693 | } | |
694 | ||
695 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
696 | struct rt6_info *rr_head, | |
afc154e9 HFS |
697 | u32 metric, int oif, int strict, |
698 | bool *do_rr) | |
f11e6659 | 699 | { |
9fbdcfaf | 700 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 701 | int mpri = -1; |
1da177e4 | 702 | |
f11e6659 | 703 | match = NULL; |
9fbdcfaf SK |
704 | cont = NULL; |
705 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
706 | if (rt->rt6i_metric != metric) { | |
707 | cont = rt; | |
708 | break; | |
709 | } | |
710 | ||
711 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
712 | } | |
713 | ||
714 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
715 | if (rt->rt6i_metric != metric) { | |
716 | cont = rt; | |
717 | break; | |
718 | } | |
719 | ||
afc154e9 | 720 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
721 | } |
722 | ||
723 | if (match || !cont) | |
724 | return match; | |
725 | ||
726 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 727 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 728 | |
f11e6659 DM |
729 | return match; |
730 | } | |
1da177e4 | 731 | |
f11e6659 DM |
732 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
733 | { | |
734 | struct rt6_info *match, *rt0; | |
8ed67789 | 735 | struct net *net; |
afc154e9 | 736 | bool do_rr = false; |
1da177e4 | 737 | |
f11e6659 DM |
738 | rt0 = fn->rr_ptr; |
739 | if (!rt0) | |
740 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 741 | |
afc154e9 HFS |
742 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
743 | &do_rr); | |
1da177e4 | 744 | |
afc154e9 | 745 | if (do_rr) { |
d8d1f30b | 746 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 747 | |
554cfb7e | 748 | /* no entries matched; do round-robin */ |
f11e6659 DM |
749 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
750 | next = fn->leaf; | |
751 | ||
752 | if (next != rt0) | |
753 | fn->rr_ptr = next; | |
1da177e4 | 754 | } |
1da177e4 | 755 | |
d1918542 | 756 | net = dev_net(rt0->dst.dev); |
a02cec21 | 757 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
758 | } |
759 | ||
8b9df265 MKL |
760 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
761 | { | |
762 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
763 | } | |
764 | ||
70ceb4f5 YH |
765 | #ifdef CONFIG_IPV6_ROUTE_INFO |
766 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 767 | const struct in6_addr *gwaddr) |
70ceb4f5 | 768 | { |
c346dca1 | 769 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
770 | struct route_info *rinfo = (struct route_info *) opt; |
771 | struct in6_addr prefix_buf, *prefix; | |
772 | unsigned int pref; | |
4bed72e4 | 773 | unsigned long lifetime; |
70ceb4f5 YH |
774 | struct rt6_info *rt; |
775 | ||
776 | if (len < sizeof(struct route_info)) { | |
777 | return -EINVAL; | |
778 | } | |
779 | ||
780 | /* Sanity check for prefix_len and length */ | |
781 | if (rinfo->length > 3) { | |
782 | return -EINVAL; | |
783 | } else if (rinfo->prefix_len > 128) { | |
784 | return -EINVAL; | |
785 | } else if (rinfo->prefix_len > 64) { | |
786 | if (rinfo->length < 2) { | |
787 | return -EINVAL; | |
788 | } | |
789 | } else if (rinfo->prefix_len > 0) { | |
790 | if (rinfo->length < 1) { | |
791 | return -EINVAL; | |
792 | } | |
793 | } | |
794 | ||
795 | pref = rinfo->route_pref; | |
796 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 797 | return -EINVAL; |
70ceb4f5 | 798 | |
4bed72e4 | 799 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
800 | |
801 | if (rinfo->length == 3) | |
802 | prefix = (struct in6_addr *)rinfo->prefix; | |
803 | else { | |
804 | /* this function is safe */ | |
805 | ipv6_addr_prefix(&prefix_buf, | |
806 | (struct in6_addr *)rinfo->prefix, | |
807 | rinfo->prefix_len); | |
808 | prefix = &prefix_buf; | |
809 | } | |
810 | ||
f104a567 DJ |
811 | if (rinfo->prefix_len == 0) |
812 | rt = rt6_get_dflt_router(gwaddr, dev); | |
813 | else | |
814 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
815 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
816 | |
817 | if (rt && !lifetime) { | |
e0a1ad73 | 818 | ip6_del_rt(rt); |
70ceb4f5 YH |
819 | rt = NULL; |
820 | } | |
821 | ||
822 | if (!rt && lifetime) | |
efa2cea0 | 823 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
824 | pref); |
825 | else if (rt) | |
826 | rt->rt6i_flags = RTF_ROUTEINFO | | |
827 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
828 | ||
829 | if (rt) { | |
1716a961 G |
830 | if (!addrconf_finite_timeout(lifetime)) |
831 | rt6_clean_expires(rt); | |
832 | else | |
833 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
834 | ||
94e187c0 | 835 | ip6_rt_put(rt); |
70ceb4f5 YH |
836 | } |
837 | return 0; | |
838 | } | |
839 | #endif | |
840 | ||
a3c00e46 MKL |
841 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
842 | struct in6_addr *saddr) | |
843 | { | |
844 | struct fib6_node *pn; | |
845 | while (1) { | |
846 | if (fn->fn_flags & RTN_TL_ROOT) | |
847 | return NULL; | |
848 | pn = fn->parent; | |
849 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
850 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
851 | else | |
852 | fn = pn; | |
853 | if (fn->fn_flags & RTN_RTINFO) | |
854 | return fn; | |
855 | } | |
856 | } | |
c71099ac | 857 | |
8ed67789 DL |
858 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
859 | struct fib6_table *table, | |
4c9483b2 | 860 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
861 | { |
862 | struct fib6_node *fn; | |
863 | struct rt6_info *rt; | |
864 | ||
c71099ac | 865 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 866 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
867 | restart: |
868 | rt = fn->leaf; | |
4c9483b2 | 869 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 870 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 871 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
872 | if (rt == net->ipv6.ip6_null_entry) { |
873 | fn = fib6_backtrack(fn, &fl6->saddr); | |
874 | if (fn) | |
875 | goto restart; | |
876 | } | |
d8d1f30b | 877 | dst_use(&rt->dst, jiffies); |
c71099ac | 878 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
879 | return rt; |
880 | ||
881 | } | |
882 | ||
67ba4152 | 883 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
884 | int flags) |
885 | { | |
886 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
887 | } | |
888 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
889 | ||
9acd9f3a YH |
890 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
891 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 892 | { |
4c9483b2 DM |
893 | struct flowi6 fl6 = { |
894 | .flowi6_oif = oif, | |
895 | .daddr = *daddr, | |
c71099ac TG |
896 | }; |
897 | struct dst_entry *dst; | |
77d16f45 | 898 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 899 | |
adaa70bb | 900 | if (saddr) { |
4c9483b2 | 901 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
902 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
903 | } | |
904 | ||
4c9483b2 | 905 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
906 | if (dst->error == 0) |
907 | return (struct rt6_info *) dst; | |
908 | ||
909 | dst_release(dst); | |
910 | ||
1da177e4 LT |
911 | return NULL; |
912 | } | |
7159039a YH |
913 | EXPORT_SYMBOL(rt6_lookup); |
914 | ||
c71099ac | 915 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
916 | It takes new route entry, the addition fails by any reason the |
917 | route is freed. In any case, if caller does not hold it, it may | |
918 | be destroyed. | |
919 | */ | |
920 | ||
e5fd387a | 921 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 922 | struct mx6_config *mxc) |
1da177e4 LT |
923 | { |
924 | int err; | |
c71099ac | 925 | struct fib6_table *table; |
1da177e4 | 926 | |
c71099ac TG |
927 | table = rt->rt6i_table; |
928 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 929 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 930 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
931 | |
932 | return err; | |
933 | } | |
934 | ||
40e22e8f TG |
935 | int ip6_ins_rt(struct rt6_info *rt) |
936 | { | |
e715b6d3 FW |
937 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
938 | struct mx6_config mxc = { .mx = NULL, }; | |
939 | ||
940 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
941 | } |
942 | ||
8b9df265 MKL |
943 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
944 | const struct in6_addr *daddr, | |
945 | const struct in6_addr *saddr) | |
1da177e4 | 946 | { |
1da177e4 LT |
947 | struct rt6_info *rt; |
948 | ||
949 | /* | |
950 | * Clone the route. | |
951 | */ | |
952 | ||
d52d3997 | 953 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 954 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 955 | |
d52d3997 MKL |
956 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, |
957 | 0, ort->rt6i_table); | |
83a09abd MKL |
958 | |
959 | if (!rt) | |
960 | return NULL; | |
961 | ||
962 | ip6_rt_copy_init(rt, ort); | |
963 | rt->rt6i_flags |= RTF_CACHE; | |
964 | rt->rt6i_metric = 0; | |
965 | rt->dst.flags |= DST_HOST; | |
966 | rt->rt6i_dst.addr = *daddr; | |
967 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 968 | |
83a09abd MKL |
969 | if (!rt6_is_gw_or_nonexthop(ort)) { |
970 | if (ort->rt6i_dst.plen != 128 && | |
971 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
972 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 973 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
974 | if (rt->rt6i_src.plen && saddr) { |
975 | rt->rt6i_src.addr = *saddr; | |
976 | rt->rt6i_src.plen = 128; | |
8b9df265 | 977 | } |
83a09abd | 978 | #endif |
95a9a5ba | 979 | } |
1da177e4 | 980 | |
95a9a5ba YH |
981 | return rt; |
982 | } | |
1da177e4 | 983 | |
d52d3997 MKL |
984 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
985 | { | |
986 | struct rt6_info *pcpu_rt; | |
987 | ||
988 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
989 | rt->dst.dev, rt->dst.flags, | |
990 | rt->rt6i_table); | |
991 | ||
992 | if (!pcpu_rt) | |
993 | return NULL; | |
994 | ip6_rt_copy_init(pcpu_rt, rt); | |
995 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
996 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
997 | return pcpu_rt; | |
998 | } | |
999 | ||
1000 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
1001 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
1002 | { | |
1003 | struct rt6_info *pcpu_rt, *prev, **p; | |
1004 | ||
1005 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1006 | pcpu_rt = *p; | |
1007 | ||
1008 | if (pcpu_rt) | |
1009 | goto done; | |
1010 | ||
1011 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1012 | if (!pcpu_rt) { | |
1013 | struct net *net = dev_net(rt->dst.dev); | |
1014 | ||
1015 | pcpu_rt = net->ipv6.ip6_null_entry; | |
1016 | goto done; | |
1017 | } | |
1018 | ||
1019 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1020 | if (prev) { | |
1021 | /* If someone did it before us, return prev instead */ | |
1022 | dst_destroy(&pcpu_rt->dst); | |
1023 | pcpu_rt = prev; | |
1024 | } | |
1025 | ||
1026 | done: | |
1027 | dst_hold(&pcpu_rt->dst); | |
1028 | rt6_dst_from_metrics_check(pcpu_rt); | |
1029 | return pcpu_rt; | |
1030 | } | |
1031 | ||
8ed67789 | 1032 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 1033 | struct flowi6 *fl6, int flags) |
1da177e4 | 1034 | { |
367efcb9 | 1035 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1036 | struct rt6_info *rt; |
c71099ac | 1037 | int strict = 0; |
1da177e4 | 1038 | |
77d16f45 | 1039 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
1040 | if (net->ipv6.devconf_all->forwarding == 0) |
1041 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1042 | |
c71099ac | 1043 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1044 | |
4c9483b2 | 1045 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1046 | saved_fn = fn; |
1da177e4 | 1047 | |
a3c00e46 | 1048 | redo_rt6_select: |
367efcb9 | 1049 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1050 | if (rt->rt6i_nsiblings) |
367efcb9 | 1051 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1052 | if (rt == net->ipv6.ip6_null_entry) { |
1053 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1054 | if (fn) | |
1055 | goto redo_rt6_select; | |
367efcb9 MKL |
1056 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1057 | /* also consider unreachable route */ | |
1058 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1059 | fn = saved_fn; | |
1060 | goto redo_rt6_select; | |
367efcb9 | 1061 | } |
a3c00e46 MKL |
1062 | } |
1063 | ||
fb9de91e | 1064 | |
3da59bd9 | 1065 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1066 | dst_use(&rt->dst, jiffies); |
1067 | read_unlock_bh(&table->tb6_lock); | |
1068 | ||
1069 | rt6_dst_from_metrics_check(rt); | |
1070 | return rt; | |
3da59bd9 MKL |
1071 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1072 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1073 | /* Create a RTF_CACHE clone which will not be | |
1074 | * owned by the fib6 tree. It is for the special case where | |
1075 | * the daddr in the skb during the neighbor look-up is different | |
1076 | * from the fl6->daddr used to look-up route here. | |
1077 | */ | |
1078 | ||
1079 | struct rt6_info *uncached_rt; | |
1080 | ||
d52d3997 MKL |
1081 | dst_use(&rt->dst, jiffies); |
1082 | read_unlock_bh(&table->tb6_lock); | |
1083 | ||
3da59bd9 MKL |
1084 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1085 | dst_release(&rt->dst); | |
c71099ac | 1086 | |
3da59bd9 | 1087 | if (uncached_rt) |
8d0b94af | 1088 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1089 | else |
1090 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1091 | |
3da59bd9 MKL |
1092 | dst_hold(&uncached_rt->dst); |
1093 | return uncached_rt; | |
3da59bd9 | 1094 | |
d52d3997 MKL |
1095 | } else { |
1096 | /* Get a percpu copy */ | |
1097 | ||
1098 | struct rt6_info *pcpu_rt; | |
1099 | ||
1100 | rt->dst.lastuse = jiffies; | |
1101 | rt->dst.__use++; | |
1102 | pcpu_rt = rt6_get_pcpu_route(rt); | |
1103 | read_unlock_bh(&table->tb6_lock); | |
1104 | ||
1105 | return pcpu_rt; | |
1106 | } | |
1da177e4 LT |
1107 | } |
1108 | ||
8ed67789 | 1109 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1110 | struct flowi6 *fl6, int flags) |
4acad72d | 1111 | { |
4c9483b2 | 1112 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1113 | } |
1114 | ||
72331bc0 SL |
1115 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1116 | struct net_device *dev, | |
1117 | struct flowi6 *fl6, int flags) | |
1118 | { | |
1119 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1120 | flags |= RT6_LOOKUP_F_IFACE; | |
1121 | ||
1122 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1123 | } | |
1124 | ||
c71099ac TG |
1125 | void ip6_route_input(struct sk_buff *skb) |
1126 | { | |
b71d1d42 | 1127 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1128 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1129 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
1130 | struct flowi6 fl6 = { |
1131 | .flowi6_iif = skb->dev->ifindex, | |
1132 | .daddr = iph->daddr, | |
1133 | .saddr = iph->saddr, | |
6502ca52 | 1134 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1135 | .flowi6_mark = skb->mark, |
1136 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1137 | }; |
adaa70bb | 1138 | |
72331bc0 | 1139 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1140 | } |
1141 | ||
8ed67789 | 1142 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1143 | struct flowi6 *fl6, int flags) |
1da177e4 | 1144 | { |
4c9483b2 | 1145 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1146 | } |
1147 | ||
67ba4152 | 1148 | struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1149 | struct flowi6 *fl6) |
c71099ac TG |
1150 | { |
1151 | int flags = 0; | |
1152 | ||
1fb9489b | 1153 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1154 | |
4c9483b2 | 1155 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 1156 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1157 | |
4c9483b2 | 1158 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1159 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1160 | else if (sk) |
1161 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1162 | |
4c9483b2 | 1163 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1164 | } |
7159039a | 1165 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1166 | |
2774c131 | 1167 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1168 | { |
5c1e6aa3 | 1169 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1170 | struct dst_entry *new = NULL; |
1171 | ||
f5b0a874 | 1172 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1173 | if (rt) { |
d8d1f30b | 1174 | new = &rt->dst; |
14e50e57 | 1175 | |
8104891b | 1176 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
8104891b | 1177 | |
14e50e57 | 1178 | new->__use = 1; |
352e512c | 1179 | new->input = dst_discard; |
aad88724 | 1180 | new->output = dst_discard_sk; |
14e50e57 | 1181 | |
21efcfa0 ED |
1182 | if (dst_metrics_read_only(&ort->dst)) |
1183 | new->_metrics = ort->dst._metrics; | |
1184 | else | |
1185 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1186 | rt->rt6i_idev = ort->rt6i_idev; |
1187 | if (rt->rt6i_idev) | |
1188 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1189 | |
4e3fd7a0 | 1190 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 | 1191 | rt->rt6i_flags = ort->rt6i_flags; |
14e50e57 DM |
1192 | rt->rt6i_metric = 0; |
1193 | ||
1194 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1195 | #ifdef CONFIG_IPV6_SUBTREES | |
1196 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1197 | #endif | |
1198 | ||
1199 | dst_free(new); | |
1200 | } | |
1201 | ||
69ead7af DM |
1202 | dst_release(dst_orig); |
1203 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1204 | } |
14e50e57 | 1205 | |
1da177e4 LT |
1206 | /* |
1207 | * Destination cache support functions | |
1208 | */ | |
1209 | ||
4b32b5ad MKL |
1210 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1211 | { | |
1212 | if (rt->dst.from && | |
1213 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1214 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1215 | } | |
1216 | ||
3da59bd9 MKL |
1217 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1218 | { | |
1219 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1220 | return NULL; | |
1221 | ||
1222 | if (rt6_check_expired(rt)) | |
1223 | return NULL; | |
1224 | ||
1225 | return &rt->dst; | |
1226 | } | |
1227 | ||
1228 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1229 | { | |
1230 | if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1231 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) | |
1232 | return &rt->dst; | |
1233 | else | |
1234 | return NULL; | |
1235 | } | |
1236 | ||
1da177e4 LT |
1237 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1238 | { | |
1239 | struct rt6_info *rt; | |
1240 | ||
1241 | rt = (struct rt6_info *) dst; | |
1242 | ||
6f3118b5 ND |
1243 | /* All IPV6 dsts are created with ->obsolete set to the value |
1244 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1245 | * into this function always. | |
1246 | */ | |
e3bc10bd | 1247 | |
4b32b5ad MKL |
1248 | rt6_dst_from_metrics_check(rt); |
1249 | ||
d52d3997 | 1250 | if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE)) |
3da59bd9 MKL |
1251 | return rt6_dst_from_check(rt, cookie); |
1252 | else | |
1253 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1257 | { | |
1258 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1259 | ||
1260 | if (rt) { | |
54c1a859 YH |
1261 | if (rt->rt6i_flags & RTF_CACHE) { |
1262 | if (rt6_check_expired(rt)) { | |
1263 | ip6_del_rt(rt); | |
1264 | dst = NULL; | |
1265 | } | |
1266 | } else { | |
1da177e4 | 1267 | dst_release(dst); |
54c1a859 YH |
1268 | dst = NULL; |
1269 | } | |
1da177e4 | 1270 | } |
54c1a859 | 1271 | return dst; |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | static void ip6_link_failure(struct sk_buff *skb) | |
1275 | { | |
1276 | struct rt6_info *rt; | |
1277 | ||
3ffe533c | 1278 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1279 | |
adf30907 | 1280 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1281 | if (rt) { |
1eb4f758 HFS |
1282 | if (rt->rt6i_flags & RTF_CACHE) { |
1283 | dst_hold(&rt->dst); | |
1284 | if (ip6_del_rt(rt)) | |
1285 | dst_free(&rt->dst); | |
1286 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { | |
1da177e4 | 1287 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1288 | } |
1da177e4 LT |
1289 | } |
1290 | } | |
1291 | ||
45e4fd26 MKL |
1292 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1293 | { | |
1294 | struct net *net = dev_net(rt->dst.dev); | |
1295 | ||
1296 | rt->rt6i_flags |= RTF_MODIFIED; | |
1297 | rt->rt6i_pmtu = mtu; | |
1298 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1299 | } | |
1300 | ||
1301 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, | |
1302 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1303 | { |
67ba4152 | 1304 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1305 | |
45e4fd26 MKL |
1306 | if (rt6->rt6i_flags & RTF_LOCAL) |
1307 | return; | |
81aded24 | 1308 | |
45e4fd26 MKL |
1309 | dst_confirm(dst); |
1310 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); | |
1311 | if (mtu >= dst_mtu(dst)) | |
1312 | return; | |
9d289715 | 1313 | |
45e4fd26 MKL |
1314 | if (rt6->rt6i_flags & RTF_CACHE) { |
1315 | rt6_do_update_pmtu(rt6, mtu); | |
1316 | } else { | |
1317 | const struct in6_addr *daddr, *saddr; | |
1318 | struct rt6_info *nrt6; | |
1319 | ||
1320 | if (iph) { | |
1321 | daddr = &iph->daddr; | |
1322 | saddr = &iph->saddr; | |
1323 | } else if (sk) { | |
1324 | daddr = &sk->sk_v6_daddr; | |
1325 | saddr = &inet6_sk(sk)->saddr; | |
1326 | } else { | |
1327 | return; | |
1328 | } | |
1329 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); | |
1330 | if (nrt6) { | |
1331 | rt6_do_update_pmtu(nrt6, mtu); | |
1332 | ||
1333 | /* ip6_ins_rt(nrt6) will bump the | |
1334 | * rt6->rt6i_node->fn_sernum | |
1335 | * which will fail the next rt6_check() and | |
1336 | * invalidate the sk->sk_dst_cache. | |
1337 | */ | |
1338 | ip6_ins_rt(nrt6); | |
1339 | } | |
1da177e4 LT |
1340 | } |
1341 | } | |
1342 | ||
45e4fd26 MKL |
1343 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1344 | struct sk_buff *skb, u32 mtu) | |
1345 | { | |
1346 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1347 | } | |
1348 | ||
42ae66c8 DM |
1349 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1350 | int oif, u32 mark) | |
81aded24 DM |
1351 | { |
1352 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1353 | struct dst_entry *dst; | |
1354 | struct flowi6 fl6; | |
1355 | ||
1356 | memset(&fl6, 0, sizeof(fl6)); | |
1357 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1358 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1359 | fl6.daddr = iph->daddr; |
1360 | fl6.saddr = iph->saddr; | |
6502ca52 | 1361 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1362 | |
1363 | dst = ip6_route_output(net, NULL, &fl6); | |
1364 | if (!dst->error) | |
45e4fd26 | 1365 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1366 | dst_release(dst); |
1367 | } | |
1368 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1369 | ||
1370 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1371 | { | |
1372 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1373 | sk->sk_bound_dev_if, sk->sk_mark); | |
1374 | } | |
1375 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1376 | ||
b55b76b2 DJ |
1377 | /* Handle redirects */ |
1378 | struct ip6rd_flowi { | |
1379 | struct flowi6 fl6; | |
1380 | struct in6_addr gateway; | |
1381 | }; | |
1382 | ||
1383 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1384 | struct fib6_table *table, | |
1385 | struct flowi6 *fl6, | |
1386 | int flags) | |
1387 | { | |
1388 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1389 | struct rt6_info *rt; | |
1390 | struct fib6_node *fn; | |
1391 | ||
1392 | /* Get the "current" route for this destination and | |
1393 | * check if the redirect has come from approriate router. | |
1394 | * | |
1395 | * RFC 4861 specifies that redirects should only be | |
1396 | * accepted if they come from the nexthop to the target. | |
1397 | * Due to the way the routes are chosen, this notion | |
1398 | * is a bit fuzzy and one might need to check all possible | |
1399 | * routes. | |
1400 | */ | |
1401 | ||
1402 | read_lock_bh(&table->tb6_lock); | |
1403 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1404 | restart: | |
1405 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1406 | if (rt6_check_expired(rt)) | |
1407 | continue; | |
1408 | if (rt->dst.error) | |
1409 | break; | |
1410 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1411 | continue; | |
1412 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1413 | continue; | |
1414 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1415 | continue; | |
1416 | break; | |
1417 | } | |
1418 | ||
1419 | if (!rt) | |
1420 | rt = net->ipv6.ip6_null_entry; | |
1421 | else if (rt->dst.error) { | |
1422 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1423 | goto out; |
1424 | } | |
1425 | ||
1426 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1427 | fn = fib6_backtrack(fn, &fl6->saddr); |
1428 | if (fn) | |
1429 | goto restart; | |
b55b76b2 | 1430 | } |
a3c00e46 | 1431 | |
b0a1ba59 | 1432 | out: |
b55b76b2 DJ |
1433 | dst_hold(&rt->dst); |
1434 | ||
1435 | read_unlock_bh(&table->tb6_lock); | |
1436 | ||
1437 | return rt; | |
1438 | }; | |
1439 | ||
1440 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1441 | const struct flowi6 *fl6, | |
1442 | const struct in6_addr *gateway) | |
1443 | { | |
1444 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1445 | struct ip6rd_flowi rdfl; | |
1446 | ||
1447 | rdfl.fl6 = *fl6; | |
1448 | rdfl.gateway = *gateway; | |
1449 | ||
1450 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1451 | flags, __ip6_route_redirect); | |
1452 | } | |
1453 | ||
3a5ad2ee DM |
1454 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1455 | { | |
1456 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1457 | struct dst_entry *dst; | |
1458 | struct flowi6 fl6; | |
1459 | ||
1460 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1461 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1462 | fl6.flowi6_oif = oif; |
1463 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1464 | fl6.daddr = iph->daddr; |
1465 | fl6.saddr = iph->saddr; | |
6502ca52 | 1466 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1467 | |
b55b76b2 DJ |
1468 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1469 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1470 | dst_release(dst); |
1471 | } | |
1472 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1473 | ||
c92a59ec DJ |
1474 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1475 | u32 mark) | |
1476 | { | |
1477 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1478 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1479 | struct dst_entry *dst; | |
1480 | struct flowi6 fl6; | |
1481 | ||
1482 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1483 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1484 | fl6.flowi6_oif = oif; |
1485 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1486 | fl6.daddr = msg->dest; |
1487 | fl6.saddr = iph->daddr; | |
1488 | ||
b55b76b2 DJ |
1489 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1490 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1491 | dst_release(dst); |
1492 | } | |
1493 | ||
3a5ad2ee DM |
1494 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1495 | { | |
1496 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1497 | } | |
1498 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1499 | ||
0dbaee3b | 1500 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1501 | { |
0dbaee3b DM |
1502 | struct net_device *dev = dst->dev; |
1503 | unsigned int mtu = dst_mtu(dst); | |
1504 | struct net *net = dev_net(dev); | |
1505 | ||
1da177e4 LT |
1506 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1507 | ||
5578689a DL |
1508 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1509 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1510 | |
1511 | /* | |
1ab1457c YH |
1512 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1513 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1514 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1515 | * rely only on pmtu discovery" |
1516 | */ | |
1517 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1518 | mtu = IPV6_MAXPLEN; | |
1519 | return mtu; | |
1520 | } | |
1521 | ||
ebb762f2 | 1522 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1523 | { |
4b32b5ad MKL |
1524 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1525 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1526 | struct inet6_dev *idev; |
618f9bc7 | 1527 | |
4b32b5ad MKL |
1528 | if (mtu) |
1529 | goto out; | |
1530 | ||
1531 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1532 | if (mtu) |
30f78d8e | 1533 | goto out; |
618f9bc7 SK |
1534 | |
1535 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1536 | |
1537 | rcu_read_lock(); | |
1538 | idev = __in6_dev_get(dst->dev); | |
1539 | if (idev) | |
1540 | mtu = idev->cnf.mtu6; | |
1541 | rcu_read_unlock(); | |
1542 | ||
30f78d8e ED |
1543 | out: |
1544 | return min_t(unsigned int, mtu, IP6_MAX_MTU); | |
d33e4553 DM |
1545 | } |
1546 | ||
3b00944c YH |
1547 | static struct dst_entry *icmp6_dst_gc_list; |
1548 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1549 | |
3b00944c | 1550 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1551 | struct flowi6 *fl6) |
1da177e4 | 1552 | { |
87a11578 | 1553 | struct dst_entry *dst; |
1da177e4 LT |
1554 | struct rt6_info *rt; |
1555 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1556 | struct net *net = dev_net(dev); |
1da177e4 | 1557 | |
38308473 | 1558 | if (unlikely(!idev)) |
122bdf67 | 1559 | return ERR_PTR(-ENODEV); |
1da177e4 | 1560 | |
8b96d22d | 1561 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1562 | if (unlikely(!rt)) { |
1da177e4 | 1563 | in6_dev_put(idev); |
87a11578 | 1564 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1565 | goto out; |
1566 | } | |
1567 | ||
8e2ec639 YZ |
1568 | rt->dst.flags |= DST_HOST; |
1569 | rt->dst.output = ip6_output; | |
d8d1f30b | 1570 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1571 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1572 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1573 | rt->rt6i_dst.plen = 128; |
1574 | rt->rt6i_idev = idev; | |
14edd87d | 1575 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1576 | |
3b00944c | 1577 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1578 | rt->dst.next = icmp6_dst_gc_list; |
1579 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1580 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1581 | |
5578689a | 1582 | fib6_force_start_gc(net); |
1da177e4 | 1583 | |
87a11578 DM |
1584 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1585 | ||
1da177e4 | 1586 | out: |
87a11578 | 1587 | return dst; |
1da177e4 LT |
1588 | } |
1589 | ||
3d0f24a7 | 1590 | int icmp6_dst_gc(void) |
1da177e4 | 1591 | { |
e9476e95 | 1592 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1593 | int more = 0; |
1da177e4 | 1594 | |
3b00944c YH |
1595 | spin_lock_bh(&icmp6_dst_lock); |
1596 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1597 | |
1da177e4 LT |
1598 | while ((dst = *pprev) != NULL) { |
1599 | if (!atomic_read(&dst->__refcnt)) { | |
1600 | *pprev = dst->next; | |
1601 | dst_free(dst); | |
1da177e4 LT |
1602 | } else { |
1603 | pprev = &dst->next; | |
3d0f24a7 | 1604 | ++more; |
1da177e4 LT |
1605 | } |
1606 | } | |
1607 | ||
3b00944c | 1608 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1609 | |
3d0f24a7 | 1610 | return more; |
1da177e4 LT |
1611 | } |
1612 | ||
1e493d19 DM |
1613 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1614 | void *arg) | |
1615 | { | |
1616 | struct dst_entry *dst, **pprev; | |
1617 | ||
1618 | spin_lock_bh(&icmp6_dst_lock); | |
1619 | pprev = &icmp6_dst_gc_list; | |
1620 | while ((dst = *pprev) != NULL) { | |
1621 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1622 | if (func(rt, arg)) { | |
1623 | *pprev = dst->next; | |
1624 | dst_free(dst); | |
1625 | } else { | |
1626 | pprev = &dst->next; | |
1627 | } | |
1628 | } | |
1629 | spin_unlock_bh(&icmp6_dst_lock); | |
1630 | } | |
1631 | ||
569d3645 | 1632 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1633 | { |
86393e52 | 1634 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1635 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1636 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1637 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1638 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1639 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1640 | int entries; |
7019b78e | 1641 | |
fc66f95c | 1642 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1643 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1644 | entries <= rt_max_size) |
1da177e4 LT |
1645 | goto out; |
1646 | ||
6891a346 | 1647 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1648 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1649 | entries = dst_entries_get_slow(ops); |
1650 | if (entries < ops->gc_thresh) | |
7019b78e | 1651 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1652 | out: |
7019b78e | 1653 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1654 | return entries > rt_max_size; |
1da177e4 LT |
1655 | } |
1656 | ||
e715b6d3 FW |
1657 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1658 | const struct fib6_config *cfg) | |
1659 | { | |
1660 | struct nlattr *nla; | |
1661 | int remaining; | |
1662 | u32 *mp; | |
1663 | ||
63159f29 | 1664 | if (!cfg->fc_mx) |
e715b6d3 FW |
1665 | return 0; |
1666 | ||
1667 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1668 | if (unlikely(!mp)) | |
1669 | return -ENOMEM; | |
1670 | ||
1671 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1672 | int type = nla_type(nla); | |
1673 | ||
1674 | if (type) { | |
ea697639 DB |
1675 | u32 val; |
1676 | ||
e715b6d3 FW |
1677 | if (unlikely(type > RTAX_MAX)) |
1678 | goto err; | |
ea697639 DB |
1679 | if (type == RTAX_CC_ALGO) { |
1680 | char tmp[TCP_CA_NAME_MAX]; | |
1681 | ||
1682 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
1683 | val = tcp_ca_get_key_by_name(tmp); | |
1684 | if (val == TCP_CA_UNSPEC) | |
1685 | goto err; | |
1686 | } else { | |
1687 | val = nla_get_u32(nla); | |
1688 | } | |
e715b6d3 | 1689 | |
ea697639 | 1690 | mp[type - 1] = val; |
e715b6d3 FW |
1691 | __set_bit(type - 1, mxc->mx_valid); |
1692 | } | |
1693 | } | |
1694 | ||
1695 | mxc->mx = mp; | |
1696 | ||
1697 | return 0; | |
1698 | err: | |
1699 | kfree(mp); | |
1700 | return -EINVAL; | |
1701 | } | |
1da177e4 | 1702 | |
86872cb5 | 1703 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1704 | { |
1705 | int err; | |
5578689a | 1706 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1707 | struct rt6_info *rt = NULL; |
1708 | struct net_device *dev = NULL; | |
1709 | struct inet6_dev *idev = NULL; | |
c71099ac | 1710 | struct fib6_table *table; |
e715b6d3 | 1711 | struct mx6_config mxc = { .mx = NULL, }; |
1da177e4 LT |
1712 | int addr_type; |
1713 | ||
86872cb5 | 1714 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1715 | return -EINVAL; |
1716 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1717 | if (cfg->fc_src_len) |
1da177e4 LT |
1718 | return -EINVAL; |
1719 | #endif | |
86872cb5 | 1720 | if (cfg->fc_ifindex) { |
1da177e4 | 1721 | err = -ENODEV; |
5578689a | 1722 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1723 | if (!dev) |
1724 | goto out; | |
1725 | idev = in6_dev_get(dev); | |
1726 | if (!idev) | |
1727 | goto out; | |
1728 | } | |
1729 | ||
86872cb5 TG |
1730 | if (cfg->fc_metric == 0) |
1731 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1732 | |
d71314b4 | 1733 | err = -ENOBUFS; |
38308473 DM |
1734 | if (cfg->fc_nlinfo.nlh && |
1735 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1736 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1737 | if (!table) { |
f3213831 | 1738 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1739 | table = fib6_new_table(net, cfg->fc_table); |
1740 | } | |
1741 | } else { | |
1742 | table = fib6_new_table(net, cfg->fc_table); | |
1743 | } | |
38308473 DM |
1744 | |
1745 | if (!table) | |
c71099ac | 1746 | goto out; |
c71099ac | 1747 | |
c88507fb | 1748 | rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table); |
1da177e4 | 1749 | |
38308473 | 1750 | if (!rt) { |
1da177e4 LT |
1751 | err = -ENOMEM; |
1752 | goto out; | |
1753 | } | |
1754 | ||
1716a961 G |
1755 | if (cfg->fc_flags & RTF_EXPIRES) |
1756 | rt6_set_expires(rt, jiffies + | |
1757 | clock_t_to_jiffies(cfg->fc_expires)); | |
1758 | else | |
1759 | rt6_clean_expires(rt); | |
1da177e4 | 1760 | |
86872cb5 TG |
1761 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1762 | cfg->fc_protocol = RTPROT_BOOT; | |
1763 | rt->rt6i_protocol = cfg->fc_protocol; | |
1764 | ||
1765 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1766 | |
1767 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1768 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1769 | else if (cfg->fc_flags & RTF_LOCAL) |
1770 | rt->dst.input = ip6_input; | |
1da177e4 | 1771 | else |
d8d1f30b | 1772 | rt->dst.input = ip6_forward; |
1da177e4 | 1773 | |
d8d1f30b | 1774 | rt->dst.output = ip6_output; |
1da177e4 | 1775 | |
86872cb5 TG |
1776 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1777 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1778 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1779 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1780 | |
1da177e4 | 1781 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1782 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1783 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1784 | #endif |
1785 | ||
86872cb5 | 1786 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1787 | |
1788 | /* We cannot add true routes via loopback here, | |
1789 | they would result in kernel looping; promote them to reject routes | |
1790 | */ | |
86872cb5 | 1791 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1792 | (dev && (dev->flags & IFF_LOOPBACK) && |
1793 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1794 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1795 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1796 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1797 | if (dev) { |
1798 | dev_put(dev); | |
1799 | in6_dev_put(idev); | |
1800 | } | |
5578689a | 1801 | dev = net->loopback_dev; |
1da177e4 LT |
1802 | dev_hold(dev); |
1803 | idev = in6_dev_get(dev); | |
1804 | if (!idev) { | |
1805 | err = -ENODEV; | |
1806 | goto out; | |
1807 | } | |
1808 | } | |
1da177e4 | 1809 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1810 | switch (cfg->fc_type) { |
1811 | case RTN_BLACKHOLE: | |
1812 | rt->dst.error = -EINVAL; | |
aad88724 | 1813 | rt->dst.output = dst_discard_sk; |
7150aede | 1814 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1815 | break; |
1816 | case RTN_PROHIBIT: | |
1817 | rt->dst.error = -EACCES; | |
7150aede K |
1818 | rt->dst.output = ip6_pkt_prohibit_out; |
1819 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1820 | break; |
b4949ab2 | 1821 | case RTN_THROW: |
ef2c7d7b | 1822 | default: |
7150aede K |
1823 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
1824 | : -ENETUNREACH; | |
1825 | rt->dst.output = ip6_pkt_discard_out; | |
1826 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1827 | break; |
1828 | } | |
1da177e4 LT |
1829 | goto install_route; |
1830 | } | |
1831 | ||
86872cb5 | 1832 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1833 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1834 | int gwa_type; |
1835 | ||
86872cb5 | 1836 | gw_addr = &cfg->fc_gateway; |
48ed7b26 FW |
1837 | |
1838 | /* if gw_addr is local we will fail to detect this in case | |
1839 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
1840 | * will return already-added prefix route via interface that | |
1841 | * prefix route was assigned to, which might be non-loopback. | |
1842 | */ | |
1843 | err = -EINVAL; | |
1844 | if (ipv6_chk_addr_and_flags(net, gw_addr, NULL, 0, 0)) | |
1845 | goto out; | |
1846 | ||
4e3fd7a0 | 1847 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1848 | gwa_type = ipv6_addr_type(gw_addr); |
1849 | ||
1850 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1851 | struct rt6_info *grt; | |
1852 | ||
1853 | /* IPv6 strictly inhibits using not link-local | |
1854 | addresses as nexthop address. | |
1855 | Otherwise, router will not able to send redirects. | |
1856 | It is very good, but in some (rare!) circumstances | |
1857 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1858 | some exceptions. --ANK | |
1859 | */ | |
38308473 | 1860 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1861 | goto out; |
1862 | ||
5578689a | 1863 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1864 | |
1865 | err = -EHOSTUNREACH; | |
38308473 | 1866 | if (!grt) |
1da177e4 LT |
1867 | goto out; |
1868 | if (dev) { | |
d1918542 | 1869 | if (dev != grt->dst.dev) { |
94e187c0 | 1870 | ip6_rt_put(grt); |
1da177e4 LT |
1871 | goto out; |
1872 | } | |
1873 | } else { | |
d1918542 | 1874 | dev = grt->dst.dev; |
1da177e4 LT |
1875 | idev = grt->rt6i_idev; |
1876 | dev_hold(dev); | |
1877 | in6_dev_hold(grt->rt6i_idev); | |
1878 | } | |
38308473 | 1879 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1880 | err = 0; |
94e187c0 | 1881 | ip6_rt_put(grt); |
1da177e4 LT |
1882 | |
1883 | if (err) | |
1884 | goto out; | |
1885 | } | |
1886 | err = -EINVAL; | |
38308473 | 1887 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1888 | goto out; |
1889 | } | |
1890 | ||
1891 | err = -ENODEV; | |
38308473 | 1892 | if (!dev) |
1da177e4 LT |
1893 | goto out; |
1894 | ||
c3968a85 DW |
1895 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1896 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1897 | err = -EINVAL; | |
1898 | goto out; | |
1899 | } | |
4e3fd7a0 | 1900 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1901 | rt->rt6i_prefsrc.plen = 128; |
1902 | } else | |
1903 | rt->rt6i_prefsrc.plen = 0; | |
1904 | ||
86872cb5 | 1905 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1906 | |
1907 | install_route: | |
d8d1f30b | 1908 | rt->dst.dev = dev; |
1da177e4 | 1909 | rt->rt6i_idev = idev; |
c71099ac | 1910 | rt->rt6i_table = table; |
63152fc0 | 1911 | |
c346dca1 | 1912 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1913 | |
e715b6d3 FW |
1914 | err = ip6_convert_metrics(&mxc, cfg); |
1915 | if (err) | |
1916 | goto out; | |
1da177e4 | 1917 | |
e715b6d3 FW |
1918 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
1919 | ||
1920 | kfree(mxc.mx); | |
1921 | return err; | |
1da177e4 LT |
1922 | out: |
1923 | if (dev) | |
1924 | dev_put(dev); | |
1925 | if (idev) | |
1926 | in6_dev_put(idev); | |
1927 | if (rt) | |
d8d1f30b | 1928 | dst_free(&rt->dst); |
1da177e4 LT |
1929 | return err; |
1930 | } | |
1931 | ||
86872cb5 | 1932 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1933 | { |
1934 | int err; | |
c71099ac | 1935 | struct fib6_table *table; |
d1918542 | 1936 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1937 | |
6825a26c G |
1938 | if (rt == net->ipv6.ip6_null_entry) { |
1939 | err = -ENOENT; | |
1940 | goto out; | |
1941 | } | |
6c813a72 | 1942 | |
c71099ac TG |
1943 | table = rt->rt6i_table; |
1944 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1945 | err = fib6_del(rt, info); |
c71099ac | 1946 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1947 | |
6825a26c | 1948 | out: |
94e187c0 | 1949 | ip6_rt_put(rt); |
1da177e4 LT |
1950 | return err; |
1951 | } | |
1952 | ||
e0a1ad73 TG |
1953 | int ip6_del_rt(struct rt6_info *rt) |
1954 | { | |
4d1169c1 | 1955 | struct nl_info info = { |
d1918542 | 1956 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1957 | }; |
528c4ceb | 1958 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1959 | } |
1960 | ||
86872cb5 | 1961 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1962 | { |
c71099ac | 1963 | struct fib6_table *table; |
1da177e4 LT |
1964 | struct fib6_node *fn; |
1965 | struct rt6_info *rt; | |
1966 | int err = -ESRCH; | |
1967 | ||
5578689a | 1968 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1969 | if (!table) |
c71099ac TG |
1970 | return err; |
1971 | ||
1972 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1973 | |
c71099ac | 1974 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1975 | &cfg->fc_dst, cfg->fc_dst_len, |
1976 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1977 | |
1da177e4 | 1978 | if (fn) { |
d8d1f30b | 1979 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
1980 | if ((rt->rt6i_flags & RTF_CACHE) && |
1981 | !(cfg->fc_flags & RTF_CACHE)) | |
1982 | continue; | |
86872cb5 | 1983 | if (cfg->fc_ifindex && |
d1918542 DM |
1984 | (!rt->dst.dev || |
1985 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1986 | continue; |
86872cb5 TG |
1987 | if (cfg->fc_flags & RTF_GATEWAY && |
1988 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1989 | continue; |
86872cb5 | 1990 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1991 | continue; |
d8d1f30b | 1992 | dst_hold(&rt->dst); |
c71099ac | 1993 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1994 | |
86872cb5 | 1995 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1996 | } |
1997 | } | |
c71099ac | 1998 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1999 | |
2000 | return err; | |
2001 | } | |
2002 | ||
6700c270 | 2003 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2004 | { |
e8599ff4 | 2005 | struct net *net = dev_net(skb->dev); |
a6279458 | 2006 | struct netevent_redirect netevent; |
e8599ff4 | 2007 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2008 | struct ndisc_options ndopts; |
2009 | struct inet6_dev *in6_dev; | |
2010 | struct neighbour *neigh; | |
71bcdba0 | 2011 | struct rd_msg *msg; |
6e157b6a DM |
2012 | int optlen, on_link; |
2013 | u8 *lladdr; | |
e8599ff4 | 2014 | |
29a3cad5 | 2015 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2016 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2017 | |
2018 | if (optlen < 0) { | |
6e157b6a | 2019 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2020 | return; |
2021 | } | |
2022 | ||
71bcdba0 | 2023 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2024 | |
71bcdba0 | 2025 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2026 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2027 | return; |
2028 | } | |
2029 | ||
6e157b6a | 2030 | on_link = 0; |
71bcdba0 | 2031 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2032 | on_link = 1; |
71bcdba0 | 2033 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2034 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2035 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2036 | return; |
2037 | } | |
2038 | ||
2039 | in6_dev = __in6_dev_get(skb->dev); | |
2040 | if (!in6_dev) | |
2041 | return; | |
2042 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2043 | return; | |
2044 | ||
2045 | /* RFC2461 8.1: | |
2046 | * The IP source address of the Redirect MUST be the same as the current | |
2047 | * first-hop router for the specified ICMP Destination Address. | |
2048 | */ | |
2049 | ||
71bcdba0 | 2050 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2051 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2052 | return; | |
2053 | } | |
6e157b6a DM |
2054 | |
2055 | lladdr = NULL; | |
e8599ff4 DM |
2056 | if (ndopts.nd_opts_tgt_lladdr) { |
2057 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2058 | skb->dev); | |
2059 | if (!lladdr) { | |
2060 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2061 | return; | |
2062 | } | |
2063 | } | |
2064 | ||
6e157b6a DM |
2065 | rt = (struct rt6_info *) dst; |
2066 | if (rt == net->ipv6.ip6_null_entry) { | |
2067 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 2068 | return; |
6e157b6a | 2069 | } |
e8599ff4 | 2070 | |
6e157b6a DM |
2071 | /* Redirect received -> path was valid. |
2072 | * Look, redirects are sent only in response to data packets, | |
2073 | * so that this nexthop apparently is reachable. --ANK | |
2074 | */ | |
2075 | dst_confirm(&rt->dst); | |
a6279458 | 2076 | |
71bcdba0 | 2077 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2078 | if (!neigh) |
2079 | return; | |
a6279458 | 2080 | |
1da177e4 LT |
2081 | /* |
2082 | * We have finally decided to accept it. | |
2083 | */ | |
2084 | ||
1ab1457c | 2085 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2086 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2087 | NEIGH_UPDATE_F_OVERRIDE| | |
2088 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
2089 | NEIGH_UPDATE_F_ISROUTER)) | |
2090 | ); | |
2091 | ||
83a09abd | 2092 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2093 | if (!nrt) |
1da177e4 LT |
2094 | goto out; |
2095 | ||
2096 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2097 | if (on_link) | |
2098 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2099 | ||
4e3fd7a0 | 2100 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2101 | |
40e22e8f | 2102 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2103 | goto out; |
2104 | ||
d8d1f30b CG |
2105 | netevent.old = &rt->dst; |
2106 | netevent.new = &nrt->dst; | |
71bcdba0 | 2107 | netevent.daddr = &msg->dest; |
60592833 | 2108 | netevent.neigh = neigh; |
8d71740c TT |
2109 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2110 | ||
38308473 | 2111 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2112 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2113 | ip6_del_rt(rt); |
1da177e4 LT |
2114 | } |
2115 | ||
2116 | out: | |
e8599ff4 | 2117 | neigh_release(neigh); |
6e157b6a DM |
2118 | } |
2119 | ||
1da177e4 LT |
2120 | /* |
2121 | * Misc support functions | |
2122 | */ | |
2123 | ||
4b32b5ad MKL |
2124 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2125 | { | |
2126 | BUG_ON(from->dst.from); | |
2127 | ||
2128 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2129 | dst_hold(&from->dst); | |
2130 | rt->dst.from = &from->dst; | |
2131 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2132 | } | |
2133 | ||
83a09abd MKL |
2134 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2135 | { | |
2136 | rt->dst.input = ort->dst.input; | |
2137 | rt->dst.output = ort->dst.output; | |
2138 | rt->rt6i_dst = ort->rt6i_dst; | |
2139 | rt->dst.error = ort->dst.error; | |
2140 | rt->rt6i_idev = ort->rt6i_idev; | |
2141 | if (rt->rt6i_idev) | |
2142 | in6_dev_hold(rt->rt6i_idev); | |
2143 | rt->dst.lastuse = jiffies; | |
2144 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2145 | rt->rt6i_flags = ort->rt6i_flags; | |
2146 | rt6_set_from(rt, ort); | |
2147 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2148 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2149 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2150 | #endif |
83a09abd MKL |
2151 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2152 | rt->rt6i_table = ort->rt6i_table; | |
1da177e4 LT |
2153 | } |
2154 | ||
70ceb4f5 | 2155 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2156 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
2157 | const struct in6_addr *prefix, int prefixlen, |
2158 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
2159 | { |
2160 | struct fib6_node *fn; | |
2161 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2162 | struct fib6_table *table; |
2163 | ||
efa2cea0 | 2164 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 2165 | if (!table) |
c71099ac | 2166 | return NULL; |
70ceb4f5 | 2167 | |
5744dd9b | 2168 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2169 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2170 | if (!fn) |
2171 | goto out; | |
2172 | ||
d8d1f30b | 2173 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2174 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2175 | continue; |
2176 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2177 | continue; | |
2178 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2179 | continue; | |
d8d1f30b | 2180 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2181 | break; |
2182 | } | |
2183 | out: | |
5744dd9b | 2184 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2185 | return rt; |
2186 | } | |
2187 | ||
efa2cea0 | 2188 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2189 | const struct in6_addr *prefix, int prefixlen, |
2190 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2191 | unsigned int pref) |
70ceb4f5 | 2192 | { |
86872cb5 TG |
2193 | struct fib6_config cfg = { |
2194 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 2195 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2196 | .fc_ifindex = ifindex, |
2197 | .fc_dst_len = prefixlen, | |
2198 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2199 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2200 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2201 | .fc_nlinfo.nlh = NULL, |
2202 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2203 | }; |
2204 | ||
4e3fd7a0 AD |
2205 | cfg.fc_dst = *prefix; |
2206 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2207 | |
e317da96 YH |
2208 | /* We should treat it as a default route if prefix length is 0. */ |
2209 | if (!prefixlen) | |
86872cb5 | 2210 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2211 | |
86872cb5 | 2212 | ip6_route_add(&cfg); |
70ceb4f5 | 2213 | |
efa2cea0 | 2214 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2215 | } |
2216 | #endif | |
2217 | ||
b71d1d42 | 2218 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2219 | { |
1da177e4 | 2220 | struct rt6_info *rt; |
c71099ac | 2221 | struct fib6_table *table; |
1da177e4 | 2222 | |
c346dca1 | 2223 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2224 | if (!table) |
c71099ac | 2225 | return NULL; |
1da177e4 | 2226 | |
5744dd9b | 2227 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2228 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2229 | if (dev == rt->dst.dev && |
045927ff | 2230 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2231 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2232 | break; | |
2233 | } | |
2234 | if (rt) | |
d8d1f30b | 2235 | dst_hold(&rt->dst); |
5744dd9b | 2236 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2237 | return rt; |
2238 | } | |
2239 | ||
b71d1d42 | 2240 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2241 | struct net_device *dev, |
2242 | unsigned int pref) | |
1da177e4 | 2243 | { |
86872cb5 TG |
2244 | struct fib6_config cfg = { |
2245 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 2246 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2247 | .fc_ifindex = dev->ifindex, |
2248 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2249 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2250 | .fc_nlinfo.portid = 0, |
5578689a | 2251 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2252 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2253 | }; |
1da177e4 | 2254 | |
4e3fd7a0 | 2255 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2256 | |
86872cb5 | 2257 | ip6_route_add(&cfg); |
1da177e4 | 2258 | |
1da177e4 LT |
2259 | return rt6_get_dflt_router(gwaddr, dev); |
2260 | } | |
2261 | ||
7b4da532 | 2262 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2263 | { |
2264 | struct rt6_info *rt; | |
c71099ac TG |
2265 | struct fib6_table *table; |
2266 | ||
2267 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2268 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2269 | if (!table) |
c71099ac | 2270 | return; |
1da177e4 LT |
2271 | |
2272 | restart: | |
c71099ac | 2273 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2274 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2275 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2276 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2277 | dst_hold(&rt->dst); |
c71099ac | 2278 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2279 | ip6_del_rt(rt); |
1da177e4 LT |
2280 | goto restart; |
2281 | } | |
2282 | } | |
c71099ac | 2283 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2284 | } |
2285 | ||
5578689a DL |
2286 | static void rtmsg_to_fib6_config(struct net *net, |
2287 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2288 | struct fib6_config *cfg) |
2289 | { | |
2290 | memset(cfg, 0, sizeof(*cfg)); | |
2291 | ||
2292 | cfg->fc_table = RT6_TABLE_MAIN; | |
2293 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
2294 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2295 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2296 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2297 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2298 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2299 | ||
5578689a | 2300 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2301 | |
4e3fd7a0 AD |
2302 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2303 | cfg->fc_src = rtmsg->rtmsg_src; | |
2304 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2305 | } |
2306 | ||
5578689a | 2307 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2308 | { |
86872cb5 | 2309 | struct fib6_config cfg; |
1da177e4 LT |
2310 | struct in6_rtmsg rtmsg; |
2311 | int err; | |
2312 | ||
67ba4152 | 2313 | switch (cmd) { |
1da177e4 LT |
2314 | case SIOCADDRT: /* Add a route */ |
2315 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2316 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2317 | return -EPERM; |
2318 | err = copy_from_user(&rtmsg, arg, | |
2319 | sizeof(struct in6_rtmsg)); | |
2320 | if (err) | |
2321 | return -EFAULT; | |
86872cb5 | 2322 | |
5578689a | 2323 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2324 | |
1da177e4 LT |
2325 | rtnl_lock(); |
2326 | switch (cmd) { | |
2327 | case SIOCADDRT: | |
86872cb5 | 2328 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2329 | break; |
2330 | case SIOCDELRT: | |
86872cb5 | 2331 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2332 | break; |
2333 | default: | |
2334 | err = -EINVAL; | |
2335 | } | |
2336 | rtnl_unlock(); | |
2337 | ||
2338 | return err; | |
3ff50b79 | 2339 | } |
1da177e4 LT |
2340 | |
2341 | return -EINVAL; | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Drop the packet on the floor | |
2346 | */ | |
2347 | ||
d5fdd6ba | 2348 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2349 | { |
612f09e8 | 2350 | int type; |
adf30907 | 2351 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2352 | switch (ipstats_mib_noroutes) { |
2353 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2354 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2355 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2356 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2357 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2358 | break; |
2359 | } | |
2360 | /* FALLTHROUGH */ | |
2361 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2362 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2363 | ipstats_mib_noroutes); | |
612f09e8 YH |
2364 | break; |
2365 | } | |
3ffe533c | 2366 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2367 | kfree_skb(skb); |
2368 | return 0; | |
2369 | } | |
2370 | ||
9ce8ade0 TG |
2371 | static int ip6_pkt_discard(struct sk_buff *skb) |
2372 | { | |
612f09e8 | 2373 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2374 | } |
2375 | ||
aad88724 | 2376 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2377 | { |
adf30907 | 2378 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2379 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2380 | } |
2381 | ||
9ce8ade0 TG |
2382 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2383 | { | |
612f09e8 | 2384 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2385 | } |
2386 | ||
aad88724 | 2387 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2388 | { |
adf30907 | 2389 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2390 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2391 | } |
2392 | ||
1da177e4 LT |
2393 | /* |
2394 | * Allocate a dst for local (unicast / anycast) address. | |
2395 | */ | |
2396 | ||
2397 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2398 | const struct in6_addr *addr, | |
8f031519 | 2399 | bool anycast) |
1da177e4 | 2400 | { |
c346dca1 | 2401 | struct net *net = dev_net(idev->dev); |
a3300ef4 HFS |
2402 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
2403 | DST_NOCOUNT, NULL); | |
2404 | if (!rt) | |
1da177e4 LT |
2405 | return ERR_PTR(-ENOMEM); |
2406 | ||
1da177e4 LT |
2407 | in6_dev_hold(idev); |
2408 | ||
11d53b49 | 2409 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2410 | rt->dst.input = ip6_input; |
2411 | rt->dst.output = ip6_output; | |
1da177e4 | 2412 | rt->rt6i_idev = idev; |
1da177e4 LT |
2413 | |
2414 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2415 | if (anycast) |
2416 | rt->rt6i_flags |= RTF_ANYCAST; | |
2417 | else | |
1da177e4 | 2418 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2419 | |
550bab42 | 2420 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2421 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2422 | rt->rt6i_dst.plen = 128; |
5578689a | 2423 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2424 | |
d8d1f30b | 2425 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2426 | |
2427 | return rt; | |
2428 | } | |
2429 | ||
c3968a85 DW |
2430 | int ip6_route_get_saddr(struct net *net, |
2431 | struct rt6_info *rt, | |
b71d1d42 | 2432 | const struct in6_addr *daddr, |
c3968a85 DW |
2433 | unsigned int prefs, |
2434 | struct in6_addr *saddr) | |
2435 | { | |
e16e888b MS |
2436 | struct inet6_dev *idev = |
2437 | rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; | |
c3968a85 | 2438 | int err = 0; |
e16e888b | 2439 | if (rt && rt->rt6i_prefsrc.plen) |
4e3fd7a0 | 2440 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2441 | else |
2442 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2443 | daddr, prefs, saddr); | |
2444 | return err; | |
2445 | } | |
2446 | ||
2447 | /* remove deleted ip from prefsrc entries */ | |
2448 | struct arg_dev_net_ip { | |
2449 | struct net_device *dev; | |
2450 | struct net *net; | |
2451 | struct in6_addr *addr; | |
2452 | }; | |
2453 | ||
2454 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2455 | { | |
2456 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2457 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2458 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2459 | ||
d1918542 | 2460 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2461 | rt != net->ipv6.ip6_null_entry && |
2462 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2463 | /* remove prefsrc entry */ | |
2464 | rt->rt6i_prefsrc.plen = 0; | |
2465 | } | |
2466 | return 0; | |
2467 | } | |
2468 | ||
2469 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2470 | { | |
2471 | struct net *net = dev_net(ifp->idev->dev); | |
2472 | struct arg_dev_net_ip adni = { | |
2473 | .dev = ifp->idev->dev, | |
2474 | .net = net, | |
2475 | .addr = &ifp->addr, | |
2476 | }; | |
0c3584d5 | 2477 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2478 | } |
2479 | ||
be7a010d DJ |
2480 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2481 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2482 | ||
2483 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2484 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2485 | { | |
2486 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2487 | ||
2488 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2489 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2490 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2491 | return -1; | |
2492 | } | |
2493 | return 0; | |
2494 | } | |
2495 | ||
2496 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2497 | { | |
2498 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2499 | } | |
2500 | ||
8ed67789 DL |
2501 | struct arg_dev_net { |
2502 | struct net_device *dev; | |
2503 | struct net *net; | |
2504 | }; | |
2505 | ||
1da177e4 LT |
2506 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2507 | { | |
bc3ef660 | 2508 | const struct arg_dev_net *adn = arg; |
2509 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2510 | |
d1918542 | 2511 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2512 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2513 | return -1; |
c159d30c | 2514 | |
1da177e4 LT |
2515 | return 0; |
2516 | } | |
2517 | ||
f3db4851 | 2518 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2519 | { |
8ed67789 DL |
2520 | struct arg_dev_net adn = { |
2521 | .dev = dev, | |
2522 | .net = net, | |
2523 | }; | |
2524 | ||
0c3584d5 | 2525 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2526 | icmp6_clean_all(fib6_ifdown, &adn); |
8d0b94af | 2527 | rt6_uncached_list_flush_dev(net, dev); |
1da177e4 LT |
2528 | } |
2529 | ||
95c96174 | 2530 | struct rt6_mtu_change_arg { |
1da177e4 | 2531 | struct net_device *dev; |
95c96174 | 2532 | unsigned int mtu; |
1da177e4 LT |
2533 | }; |
2534 | ||
2535 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2536 | { | |
2537 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2538 | struct inet6_dev *idev; | |
2539 | ||
2540 | /* In IPv6 pmtu discovery is not optional, | |
2541 | so that RTAX_MTU lock cannot disable it. | |
2542 | We still use this lock to block changes | |
2543 | caused by addrconf/ndisc. | |
2544 | */ | |
2545 | ||
2546 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2547 | if (!idev) |
1da177e4 LT |
2548 | return 0; |
2549 | ||
2550 | /* For administrative MTU increase, there is no way to discover | |
2551 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2552 | Since RFC 1981 doesn't include administrative MTU increase | |
2553 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2554 | */ | |
2555 | /* | |
2556 | If new MTU is less than route PMTU, this new MTU will be the | |
2557 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2558 | decreases; if new MTU is greater than route PMTU, and the | |
2559 | old MTU is the lowest MTU in the path, update the route PMTU | |
2560 | to reflect the increase. In this case if the other nodes' MTU | |
2561 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2562 | PMTU discouvery. | |
2563 | */ | |
d1918542 | 2564 | if (rt->dst.dev == arg->dev && |
4b32b5ad MKL |
2565 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2566 | if (rt->rt6i_flags & RTF_CACHE) { | |
2567 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2568 | * (i.e. a redirected route), | |
2569 | * the metrics of its rt->dst.from has already | |
2570 | * been updated. | |
2571 | */ | |
2572 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2573 | rt->rt6i_pmtu = arg->mtu; | |
2574 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2575 | (dst_mtu(&rt->dst) < arg->mtu && | |
2576 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2577 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2578 | } | |
566cfd8f | 2579 | } |
1da177e4 LT |
2580 | return 0; |
2581 | } | |
2582 | ||
95c96174 | 2583 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2584 | { |
c71099ac TG |
2585 | struct rt6_mtu_change_arg arg = { |
2586 | .dev = dev, | |
2587 | .mtu = mtu, | |
2588 | }; | |
1da177e4 | 2589 | |
0c3584d5 | 2590 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2591 | } |
2592 | ||
ef7c79ed | 2593 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2594 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2595 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2596 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2597 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2598 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2599 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2600 | [RTA_PREF] = { .type = NLA_U8 }, |
86872cb5 TG |
2601 | }; |
2602 | ||
2603 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2604 | struct fib6_config *cfg) | |
1da177e4 | 2605 | { |
86872cb5 TG |
2606 | struct rtmsg *rtm; |
2607 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2608 | unsigned int pref; |
86872cb5 | 2609 | int err; |
1da177e4 | 2610 | |
86872cb5 TG |
2611 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2612 | if (err < 0) | |
2613 | goto errout; | |
1da177e4 | 2614 | |
86872cb5 TG |
2615 | err = -EINVAL; |
2616 | rtm = nlmsg_data(nlh); | |
2617 | memset(cfg, 0, sizeof(*cfg)); | |
2618 | ||
2619 | cfg->fc_table = rtm->rtm_table; | |
2620 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2621 | cfg->fc_src_len = rtm->rtm_src_len; | |
2622 | cfg->fc_flags = RTF_UP; | |
2623 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2624 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2625 | |
ef2c7d7b ND |
2626 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2627 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2628 | rtm->rtm_type == RTN_PROHIBIT || |
2629 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2630 | cfg->fc_flags |= RTF_REJECT; |
2631 | ||
ab79ad14 MŻ |
2632 | if (rtm->rtm_type == RTN_LOCAL) |
2633 | cfg->fc_flags |= RTF_LOCAL; | |
2634 | ||
1f56a01f MKL |
2635 | if (rtm->rtm_flags & RTM_F_CLONED) |
2636 | cfg->fc_flags |= RTF_CACHE; | |
2637 | ||
15e47304 | 2638 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2639 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2640 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2641 | |
2642 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2643 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2644 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2645 | } |
86872cb5 TG |
2646 | |
2647 | if (tb[RTA_DST]) { | |
2648 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2649 | ||
2650 | if (nla_len(tb[RTA_DST]) < plen) | |
2651 | goto errout; | |
2652 | ||
2653 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2654 | } |
86872cb5 TG |
2655 | |
2656 | if (tb[RTA_SRC]) { | |
2657 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2658 | ||
2659 | if (nla_len(tb[RTA_SRC]) < plen) | |
2660 | goto errout; | |
2661 | ||
2662 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2663 | } |
86872cb5 | 2664 | |
c3968a85 | 2665 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2666 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2667 | |
86872cb5 TG |
2668 | if (tb[RTA_OIF]) |
2669 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2670 | ||
2671 | if (tb[RTA_PRIORITY]) | |
2672 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2673 | ||
2674 | if (tb[RTA_METRICS]) { | |
2675 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2676 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2677 | } |
86872cb5 TG |
2678 | |
2679 | if (tb[RTA_TABLE]) | |
2680 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2681 | ||
51ebd318 ND |
2682 | if (tb[RTA_MULTIPATH]) { |
2683 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2684 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2685 | } | |
2686 | ||
c78ba6d6 LR |
2687 | if (tb[RTA_PREF]) { |
2688 | pref = nla_get_u8(tb[RTA_PREF]); | |
2689 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2690 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2691 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2692 | cfg->fc_flags |= RTF_PREF(pref); | |
2693 | } | |
2694 | ||
86872cb5 TG |
2695 | err = 0; |
2696 | errout: | |
2697 | return err; | |
1da177e4 LT |
2698 | } |
2699 | ||
51ebd318 ND |
2700 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2701 | { | |
2702 | struct fib6_config r_cfg; | |
2703 | struct rtnexthop *rtnh; | |
2704 | int remaining; | |
2705 | int attrlen; | |
2706 | int err = 0, last_err = 0; | |
2707 | ||
35f1b4e9 | 2708 | remaining = cfg->fc_mp_len; |
51ebd318 ND |
2709 | beginning: |
2710 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
51ebd318 ND |
2711 | |
2712 | /* Parse a Multipath Entry */ | |
2713 | while (rtnh_ok(rtnh, remaining)) { | |
2714 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2715 | if (rtnh->rtnh_ifindex) | |
2716 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2717 | ||
2718 | attrlen = rtnh_attrlen(rtnh); | |
2719 | if (attrlen > 0) { | |
2720 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2721 | ||
2722 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2723 | if (nla) { | |
67b61f6c | 2724 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
2725 | r_cfg.fc_flags |= RTF_GATEWAY; |
2726 | } | |
2727 | } | |
2728 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2729 | if (err) { | |
2730 | last_err = err; | |
2731 | /* If we are trying to remove a route, do not stop the | |
2732 | * loop when ip6_route_del() fails (because next hop is | |
2733 | * already gone), we should try to remove all next hops. | |
2734 | */ | |
2735 | if (add) { | |
2736 | /* If add fails, we should try to delete all | |
2737 | * next hops that have been already added. | |
2738 | */ | |
2739 | add = 0; | |
35f1b4e9 | 2740 | remaining = cfg->fc_mp_len - remaining; |
51ebd318 ND |
2741 | goto beginning; |
2742 | } | |
2743 | } | |
1a72418b | 2744 | /* Because each route is added like a single route we remove |
27596472 MK |
2745 | * these flags after the first nexthop: if there is a collision, |
2746 | * we have already failed to add the first nexthop: | |
2747 | * fib6_add_rt2node() has rejected it; when replacing, old | |
2748 | * nexthops have been replaced by first new, the rest should | |
2749 | * be added to it. | |
1a72418b | 2750 | */ |
27596472 MK |
2751 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
2752 | NLM_F_REPLACE); | |
51ebd318 ND |
2753 | rtnh = rtnh_next(rtnh, &remaining); |
2754 | } | |
2755 | ||
2756 | return last_err; | |
2757 | } | |
2758 | ||
67ba4152 | 2759 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2760 | { |
86872cb5 TG |
2761 | struct fib6_config cfg; |
2762 | int err; | |
1da177e4 | 2763 | |
86872cb5 TG |
2764 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2765 | if (err < 0) | |
2766 | return err; | |
2767 | ||
51ebd318 ND |
2768 | if (cfg.fc_mp) |
2769 | return ip6_route_multipath(&cfg, 0); | |
2770 | else | |
2771 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2772 | } |
2773 | ||
67ba4152 | 2774 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2775 | { |
86872cb5 TG |
2776 | struct fib6_config cfg; |
2777 | int err; | |
1da177e4 | 2778 | |
86872cb5 TG |
2779 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2780 | if (err < 0) | |
2781 | return err; | |
2782 | ||
51ebd318 ND |
2783 | if (cfg.fc_mp) |
2784 | return ip6_route_multipath(&cfg, 1); | |
2785 | else | |
2786 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2787 | } |
2788 | ||
339bf98f TG |
2789 | static inline size_t rt6_nlmsg_size(void) |
2790 | { | |
2791 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2792 | + nla_total_size(16) /* RTA_SRC */ | |
2793 | + nla_total_size(16) /* RTA_DST */ | |
2794 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2795 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2796 | + nla_total_size(4) /* RTA_TABLE */ | |
2797 | + nla_total_size(4) /* RTA_IIF */ | |
2798 | + nla_total_size(4) /* RTA_OIF */ | |
2799 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2800 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 2801 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 LR |
2802 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
2803 | + nla_total_size(1); /* RTA_PREF */ | |
339bf98f TG |
2804 | } |
2805 | ||
191cd582 BH |
2806 | static int rt6_fill_node(struct net *net, |
2807 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2808 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2809 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2810 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 2811 | { |
4b32b5ad | 2812 | u32 metrics[RTAX_MAX]; |
1da177e4 | 2813 | struct rtmsg *rtm; |
2d7202bf | 2814 | struct nlmsghdr *nlh; |
e3703b3d | 2815 | long expires; |
9e762a4a | 2816 | u32 table; |
1da177e4 LT |
2817 | |
2818 | if (prefix) { /* user wants prefix routes only */ | |
2819 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2820 | /* success since this is not a prefix route */ | |
2821 | return 1; | |
2822 | } | |
2823 | } | |
2824 | ||
15e47304 | 2825 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2826 | if (!nlh) |
26932566 | 2827 | return -EMSGSIZE; |
2d7202bf TG |
2828 | |
2829 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2830 | rtm->rtm_family = AF_INET6; |
2831 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2832 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2833 | rtm->rtm_tos = 0; | |
c71099ac | 2834 | if (rt->rt6i_table) |
9e762a4a | 2835 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2836 | else |
9e762a4a PM |
2837 | table = RT6_TABLE_UNSPEC; |
2838 | rtm->rtm_table = table; | |
c78679e8 DM |
2839 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2840 | goto nla_put_failure; | |
ef2c7d7b ND |
2841 | if (rt->rt6i_flags & RTF_REJECT) { |
2842 | switch (rt->dst.error) { | |
2843 | case -EINVAL: | |
2844 | rtm->rtm_type = RTN_BLACKHOLE; | |
2845 | break; | |
2846 | case -EACCES: | |
2847 | rtm->rtm_type = RTN_PROHIBIT; | |
2848 | break; | |
b4949ab2 ND |
2849 | case -EAGAIN: |
2850 | rtm->rtm_type = RTN_THROW; | |
2851 | break; | |
ef2c7d7b ND |
2852 | default: |
2853 | rtm->rtm_type = RTN_UNREACHABLE; | |
2854 | break; | |
2855 | } | |
2856 | } | |
38308473 | 2857 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2858 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2859 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2860 | rtm->rtm_type = RTN_LOCAL; |
2861 | else | |
2862 | rtm->rtm_type = RTN_UNICAST; | |
2863 | rtm->rtm_flags = 0; | |
2864 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2865 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2866 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2867 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2868 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2869 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2870 | rtm->rtm_protocol = RTPROT_RA; | |
2871 | else | |
2872 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2873 | } | |
1da177e4 | 2874 | |
38308473 | 2875 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2876 | rtm->rtm_flags |= RTM_F_CLONED; |
2877 | ||
2878 | if (dst) { | |
930345ea | 2879 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 2880 | goto nla_put_failure; |
1ab1457c | 2881 | rtm->rtm_dst_len = 128; |
1da177e4 | 2882 | } else if (rtm->rtm_dst_len) |
930345ea | 2883 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 2884 | goto nla_put_failure; |
1da177e4 LT |
2885 | #ifdef CONFIG_IPV6_SUBTREES |
2886 | if (src) { | |
930345ea | 2887 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 2888 | goto nla_put_failure; |
1ab1457c | 2889 | rtm->rtm_src_len = 128; |
c78679e8 | 2890 | } else if (rtm->rtm_src_len && |
930345ea | 2891 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 2892 | goto nla_put_failure; |
1da177e4 | 2893 | #endif |
7bc570c8 YH |
2894 | if (iif) { |
2895 | #ifdef CONFIG_IPV6_MROUTE | |
2896 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2897 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2898 | if (err <= 0) { |
2899 | if (!nowait) { | |
2900 | if (err == 0) | |
2901 | return 0; | |
2902 | goto nla_put_failure; | |
2903 | } else { | |
2904 | if (err == -EMSGSIZE) | |
2905 | goto nla_put_failure; | |
2906 | } | |
2907 | } | |
2908 | } else | |
2909 | #endif | |
c78679e8 DM |
2910 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2911 | goto nla_put_failure; | |
7bc570c8 | 2912 | } else if (dst) { |
1da177e4 | 2913 | struct in6_addr saddr_buf; |
c78679e8 | 2914 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 2915 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 2916 | goto nla_put_failure; |
1da177e4 | 2917 | } |
2d7202bf | 2918 | |
c3968a85 DW |
2919 | if (rt->rt6i_prefsrc.plen) { |
2920 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2921 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 2922 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 2923 | goto nla_put_failure; |
c3968a85 DW |
2924 | } |
2925 | ||
4b32b5ad MKL |
2926 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
2927 | if (rt->rt6i_pmtu) | |
2928 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
2929 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
2930 | goto nla_put_failure; |
2931 | ||
dd0cbf29 | 2932 | if (rt->rt6i_flags & RTF_GATEWAY) { |
930345ea | 2933 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) |
94f826b8 | 2934 | goto nla_put_failure; |
94f826b8 | 2935 | } |
2d7202bf | 2936 | |
c78679e8 DM |
2937 | if (rt->dst.dev && |
2938 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2939 | goto nla_put_failure; | |
2940 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2941 | goto nla_put_failure; | |
8253947e LW |
2942 | |
2943 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2944 | |
87a50699 | 2945 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2946 | goto nla_put_failure; |
2d7202bf | 2947 | |
c78ba6d6 LR |
2948 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
2949 | goto nla_put_failure; | |
2950 | ||
053c095a JB |
2951 | nlmsg_end(skb, nlh); |
2952 | return 0; | |
2d7202bf TG |
2953 | |
2954 | nla_put_failure: | |
26932566 PM |
2955 | nlmsg_cancel(skb, nlh); |
2956 | return -EMSGSIZE; | |
1da177e4 LT |
2957 | } |
2958 | ||
1b43af54 | 2959 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2960 | { |
2961 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2962 | int prefix; | |
2963 | ||
2d7202bf TG |
2964 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2965 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2966 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2967 | } else | |
2968 | prefix = 0; | |
2969 | ||
191cd582 BH |
2970 | return rt6_fill_node(arg->net, |
2971 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2972 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2973 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2974 | } |
2975 | ||
67ba4152 | 2976 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 2977 | { |
3b1e0a65 | 2978 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2979 | struct nlattr *tb[RTA_MAX+1]; |
2980 | struct rt6_info *rt; | |
1da177e4 | 2981 | struct sk_buff *skb; |
ab364a6f | 2982 | struct rtmsg *rtm; |
4c9483b2 | 2983 | struct flowi6 fl6; |
72331bc0 | 2984 | int err, iif = 0, oif = 0; |
1da177e4 | 2985 | |
ab364a6f TG |
2986 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2987 | if (err < 0) | |
2988 | goto errout; | |
1da177e4 | 2989 | |
ab364a6f | 2990 | err = -EINVAL; |
4c9483b2 | 2991 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2992 | |
ab364a6f TG |
2993 | if (tb[RTA_SRC]) { |
2994 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2995 | goto errout; | |
2996 | ||
4e3fd7a0 | 2997 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2998 | } |
2999 | ||
3000 | if (tb[RTA_DST]) { | |
3001 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3002 | goto errout; | |
3003 | ||
4e3fd7a0 | 3004 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3005 | } |
3006 | ||
3007 | if (tb[RTA_IIF]) | |
3008 | iif = nla_get_u32(tb[RTA_IIF]); | |
3009 | ||
3010 | if (tb[RTA_OIF]) | |
72331bc0 | 3011 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3012 | |
2e47b291 LC |
3013 | if (tb[RTA_MARK]) |
3014 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3015 | ||
1da177e4 LT |
3016 | if (iif) { |
3017 | struct net_device *dev; | |
72331bc0 SL |
3018 | int flags = 0; |
3019 | ||
5578689a | 3020 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3021 | if (!dev) { |
3022 | err = -ENODEV; | |
ab364a6f | 3023 | goto errout; |
1da177e4 | 3024 | } |
72331bc0 SL |
3025 | |
3026 | fl6.flowi6_iif = iif; | |
3027 | ||
3028 | if (!ipv6_addr_any(&fl6.saddr)) | |
3029 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3030 | ||
3031 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3032 | flags); | |
3033 | } else { | |
3034 | fl6.flowi6_oif = oif; | |
3035 | ||
3036 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
3037 | } |
3038 | ||
ab364a6f | 3039 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3040 | if (!skb) { |
94e187c0 | 3041 | ip6_rt_put(rt); |
ab364a6f TG |
3042 | err = -ENOBUFS; |
3043 | goto errout; | |
3044 | } | |
1da177e4 | 3045 | |
ab364a6f TG |
3046 | /* Reserve room for dummy headers, this skb can pass |
3047 | through good chunk of routing engine. | |
3048 | */ | |
459a98ed | 3049 | skb_reset_mac_header(skb); |
ab364a6f | 3050 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 3051 | |
d8d1f30b | 3052 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3053 | |
4c9483b2 | 3054 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3055 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 3056 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 3057 | if (err < 0) { |
ab364a6f TG |
3058 | kfree_skb(skb); |
3059 | goto errout; | |
1da177e4 LT |
3060 | } |
3061 | ||
15e47304 | 3062 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3063 | errout: |
1da177e4 | 3064 | return err; |
1da177e4 LT |
3065 | } |
3066 | ||
86872cb5 | 3067 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
3068 | { |
3069 | struct sk_buff *skb; | |
5578689a | 3070 | struct net *net = info->nl_net; |
528c4ceb DL |
3071 | u32 seq; |
3072 | int err; | |
3073 | ||
3074 | err = -ENOBUFS; | |
38308473 | 3075 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3076 | |
339bf98f | 3077 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 3078 | if (!skb) |
21713ebc TG |
3079 | goto errout; |
3080 | ||
191cd582 | 3081 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 3082 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
3083 | if (err < 0) { |
3084 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3085 | WARN_ON(err == -EMSGSIZE); | |
3086 | kfree_skb(skb); | |
3087 | goto errout; | |
3088 | } | |
15e47304 | 3089 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3090 | info->nlh, gfp_any()); |
3091 | return; | |
21713ebc TG |
3092 | errout: |
3093 | if (err < 0) | |
5578689a | 3094 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3095 | } |
3096 | ||
8ed67789 | 3097 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3098 | unsigned long event, void *ptr) |
8ed67789 | 3099 | { |
351638e7 | 3100 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3101 | struct net *net = dev_net(dev); |
8ed67789 DL |
3102 | |
3103 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3104 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3105 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3106 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3107 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3108 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3109 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3110 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3111 | #endif | |
3112 | } | |
3113 | ||
3114 | return NOTIFY_OK; | |
3115 | } | |
3116 | ||
1da177e4 LT |
3117 | /* |
3118 | * /proc | |
3119 | */ | |
3120 | ||
3121 | #ifdef CONFIG_PROC_FS | |
3122 | ||
33120b30 AD |
3123 | static const struct file_operations ipv6_route_proc_fops = { |
3124 | .owner = THIS_MODULE, | |
3125 | .open = ipv6_route_open, | |
3126 | .read = seq_read, | |
3127 | .llseek = seq_lseek, | |
8d2ca1d7 | 3128 | .release = seq_release_net, |
33120b30 AD |
3129 | }; |
3130 | ||
1da177e4 LT |
3131 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3132 | { | |
69ddb805 | 3133 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3134 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3135 | net->ipv6.rt6_stats->fib_nodes, |
3136 | net->ipv6.rt6_stats->fib_route_nodes, | |
3137 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3138 | net->ipv6.rt6_stats->fib_rt_entries, | |
3139 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3140 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3141 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3142 | |
3143 | return 0; | |
3144 | } | |
3145 | ||
3146 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3147 | { | |
de05c557 | 3148 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3149 | } |
3150 | ||
9a32144e | 3151 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3152 | .owner = THIS_MODULE, |
3153 | .open = rt6_stats_seq_open, | |
3154 | .read = seq_read, | |
3155 | .llseek = seq_lseek, | |
b6fcbdb4 | 3156 | .release = single_release_net, |
1da177e4 LT |
3157 | }; |
3158 | #endif /* CONFIG_PROC_FS */ | |
3159 | ||
3160 | #ifdef CONFIG_SYSCTL | |
3161 | ||
1da177e4 | 3162 | static |
fe2c6338 | 3163 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3164 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3165 | { | |
c486da34 LAG |
3166 | struct net *net; |
3167 | int delay; | |
3168 | if (!write) | |
1da177e4 | 3169 | return -EINVAL; |
c486da34 LAG |
3170 | |
3171 | net = (struct net *)ctl->extra1; | |
3172 | delay = net->ipv6.sysctl.flush_delay; | |
3173 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3174 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3175 | return 0; |
1da177e4 LT |
3176 | } |
3177 | ||
fe2c6338 | 3178 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3179 | { |
1da177e4 | 3180 | .procname = "flush", |
4990509f | 3181 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3182 | .maxlen = sizeof(int), |
89c8b3a1 | 3183 | .mode = 0200, |
6d9f239a | 3184 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3185 | }, |
3186 | { | |
1da177e4 | 3187 | .procname = "gc_thresh", |
9a7ec3a9 | 3188 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3189 | .maxlen = sizeof(int), |
3190 | .mode = 0644, | |
6d9f239a | 3191 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3192 | }, |
3193 | { | |
1da177e4 | 3194 | .procname = "max_size", |
4990509f | 3195 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3196 | .maxlen = sizeof(int), |
3197 | .mode = 0644, | |
6d9f239a | 3198 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3199 | }, |
3200 | { | |
1da177e4 | 3201 | .procname = "gc_min_interval", |
4990509f | 3202 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3203 | .maxlen = sizeof(int), |
3204 | .mode = 0644, | |
6d9f239a | 3205 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3206 | }, |
3207 | { | |
1da177e4 | 3208 | .procname = "gc_timeout", |
4990509f | 3209 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3210 | .maxlen = sizeof(int), |
3211 | .mode = 0644, | |
6d9f239a | 3212 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3213 | }, |
3214 | { | |
1da177e4 | 3215 | .procname = "gc_interval", |
4990509f | 3216 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3217 | .maxlen = sizeof(int), |
3218 | .mode = 0644, | |
6d9f239a | 3219 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3220 | }, |
3221 | { | |
1da177e4 | 3222 | .procname = "gc_elasticity", |
4990509f | 3223 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3224 | .maxlen = sizeof(int), |
3225 | .mode = 0644, | |
f3d3f616 | 3226 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3227 | }, |
3228 | { | |
1da177e4 | 3229 | .procname = "mtu_expires", |
4990509f | 3230 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3231 | .maxlen = sizeof(int), |
3232 | .mode = 0644, | |
6d9f239a | 3233 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3234 | }, |
3235 | { | |
1da177e4 | 3236 | .procname = "min_adv_mss", |
4990509f | 3237 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3238 | .maxlen = sizeof(int), |
3239 | .mode = 0644, | |
f3d3f616 | 3240 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3241 | }, |
3242 | { | |
1da177e4 | 3243 | .procname = "gc_min_interval_ms", |
4990509f | 3244 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3245 | .maxlen = sizeof(int), |
3246 | .mode = 0644, | |
6d9f239a | 3247 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3248 | }, |
f8572d8f | 3249 | { } |
1da177e4 LT |
3250 | }; |
3251 | ||
2c8c1e72 | 3252 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3253 | { |
3254 | struct ctl_table *table; | |
3255 | ||
3256 | table = kmemdup(ipv6_route_table_template, | |
3257 | sizeof(ipv6_route_table_template), | |
3258 | GFP_KERNEL); | |
5ee09105 YH |
3259 | |
3260 | if (table) { | |
3261 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3262 | table[0].extra1 = net; |
86393e52 | 3263 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3264 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3265 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3266 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3267 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3268 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3269 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3270 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3271 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3272 | |
3273 | /* Don't export sysctls to unprivileged users */ | |
3274 | if (net->user_ns != &init_user_ns) | |
3275 | table[0].procname = NULL; | |
5ee09105 YH |
3276 | } |
3277 | ||
760f2d01 DL |
3278 | return table; |
3279 | } | |
1da177e4 LT |
3280 | #endif |
3281 | ||
2c8c1e72 | 3282 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3283 | { |
633d424b | 3284 | int ret = -ENOMEM; |
8ed67789 | 3285 | |
86393e52 AD |
3286 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3287 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3288 | |
fc66f95c ED |
3289 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3290 | goto out_ip6_dst_ops; | |
3291 | ||
8ed67789 DL |
3292 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3293 | sizeof(*net->ipv6.ip6_null_entry), | |
3294 | GFP_KERNEL); | |
3295 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3296 | goto out_ip6_dst_entries; |
d8d1f30b | 3297 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3298 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3299 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3300 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3301 | ip6_template_metrics, true); | |
8ed67789 DL |
3302 | |
3303 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3304 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3305 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3306 | GFP_KERNEL); | |
68fffc67 PZ |
3307 | if (!net->ipv6.ip6_prohibit_entry) |
3308 | goto out_ip6_null_entry; | |
d8d1f30b | 3309 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3310 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3311 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3312 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3313 | ip6_template_metrics, true); | |
8ed67789 DL |
3314 | |
3315 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3316 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3317 | GFP_KERNEL); | |
68fffc67 PZ |
3318 | if (!net->ipv6.ip6_blk_hole_entry) |
3319 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3320 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3321 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3322 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3323 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3324 | ip6_template_metrics, true); | |
8ed67789 DL |
3325 | #endif |
3326 | ||
b339a47c PZ |
3327 | net->ipv6.sysctl.flush_delay = 0; |
3328 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3329 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3330 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3331 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3332 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3333 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3334 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3335 | ||
6891a346 BT |
3336 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3337 | ||
8ed67789 DL |
3338 | ret = 0; |
3339 | out: | |
3340 | return ret; | |
f2fc6a54 | 3341 | |
68fffc67 PZ |
3342 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3343 | out_ip6_prohibit_entry: | |
3344 | kfree(net->ipv6.ip6_prohibit_entry); | |
3345 | out_ip6_null_entry: | |
3346 | kfree(net->ipv6.ip6_null_entry); | |
3347 | #endif | |
fc66f95c ED |
3348 | out_ip6_dst_entries: |
3349 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3350 | out_ip6_dst_ops: |
f2fc6a54 | 3351 | goto out; |
cdb18761 DL |
3352 | } |
3353 | ||
2c8c1e72 | 3354 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3355 | { |
8ed67789 DL |
3356 | kfree(net->ipv6.ip6_null_entry); |
3357 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3358 | kfree(net->ipv6.ip6_prohibit_entry); | |
3359 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3360 | #endif | |
41bb78b4 | 3361 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3362 | } |
3363 | ||
d189634e TG |
3364 | static int __net_init ip6_route_net_init_late(struct net *net) |
3365 | { | |
3366 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3367 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3368 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3369 | #endif |
3370 | return 0; | |
3371 | } | |
3372 | ||
3373 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3374 | { | |
3375 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3376 | remove_proc_entry("ipv6_route", net->proc_net); |
3377 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3378 | #endif |
3379 | } | |
3380 | ||
cdb18761 DL |
3381 | static struct pernet_operations ip6_route_net_ops = { |
3382 | .init = ip6_route_net_init, | |
3383 | .exit = ip6_route_net_exit, | |
3384 | }; | |
3385 | ||
c3426b47 DM |
3386 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3387 | { | |
3388 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3389 | ||
3390 | if (!bp) | |
3391 | return -ENOMEM; | |
3392 | inet_peer_base_init(bp); | |
3393 | net->ipv6.peers = bp; | |
3394 | return 0; | |
3395 | } | |
3396 | ||
3397 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3398 | { | |
3399 | struct inet_peer_base *bp = net->ipv6.peers; | |
3400 | ||
3401 | net->ipv6.peers = NULL; | |
56a6b248 | 3402 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3403 | kfree(bp); |
3404 | } | |
3405 | ||
2b823f72 | 3406 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3407 | .init = ipv6_inetpeer_init, |
3408 | .exit = ipv6_inetpeer_exit, | |
3409 | }; | |
3410 | ||
d189634e TG |
3411 | static struct pernet_operations ip6_route_net_late_ops = { |
3412 | .init = ip6_route_net_init_late, | |
3413 | .exit = ip6_route_net_exit_late, | |
3414 | }; | |
3415 | ||
8ed67789 DL |
3416 | static struct notifier_block ip6_route_dev_notifier = { |
3417 | .notifier_call = ip6_route_dev_notify, | |
3418 | .priority = 0, | |
3419 | }; | |
3420 | ||
433d49c3 | 3421 | int __init ip6_route_init(void) |
1da177e4 | 3422 | { |
433d49c3 | 3423 | int ret; |
8d0b94af | 3424 | int cpu; |
433d49c3 | 3425 | |
9a7ec3a9 DL |
3426 | ret = -ENOMEM; |
3427 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3428 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3429 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3430 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3431 | goto out; |
14e50e57 | 3432 | |
fc66f95c | 3433 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3434 | if (ret) |
bdb3289f | 3435 | goto out_kmem_cache; |
bdb3289f | 3436 | |
c3426b47 DM |
3437 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3438 | if (ret) | |
e8803b6c | 3439 | goto out_dst_entries; |
2a0c451a | 3440 | |
7e52b33b DM |
3441 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3442 | if (ret) | |
3443 | goto out_register_inetpeer; | |
c3426b47 | 3444 | |
5dc121e9 AE |
3445 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3446 | ||
8ed67789 DL |
3447 | /* Registering of the loopback is done before this portion of code, |
3448 | * the loopback reference in rt6_info will not be taken, do it | |
3449 | * manually for init_net */ | |
d8d1f30b | 3450 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3451 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3452 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3453 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3454 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3455 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3456 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3457 | #endif | |
e8803b6c | 3458 | ret = fib6_init(); |
433d49c3 | 3459 | if (ret) |
8ed67789 | 3460 | goto out_register_subsys; |
433d49c3 | 3461 | |
433d49c3 DL |
3462 | ret = xfrm6_init(); |
3463 | if (ret) | |
e8803b6c | 3464 | goto out_fib6_init; |
c35b7e72 | 3465 | |
433d49c3 DL |
3466 | ret = fib6_rules_init(); |
3467 | if (ret) | |
3468 | goto xfrm6_init; | |
7e5449c2 | 3469 | |
d189634e TG |
3470 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3471 | if (ret) | |
3472 | goto fib6_rules_init; | |
3473 | ||
433d49c3 | 3474 | ret = -ENOBUFS; |
c7ac8679 GR |
3475 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3476 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3477 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3478 | goto out_register_late_subsys; |
c127ea2c | 3479 | |
8ed67789 | 3480 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3481 | if (ret) |
d189634e | 3482 | goto out_register_late_subsys; |
8ed67789 | 3483 | |
8d0b94af MKL |
3484 | for_each_possible_cpu(cpu) { |
3485 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
3486 | ||
3487 | INIT_LIST_HEAD(&ul->head); | |
3488 | spin_lock_init(&ul->lock); | |
3489 | } | |
3490 | ||
433d49c3 DL |
3491 | out: |
3492 | return ret; | |
3493 | ||
d189634e TG |
3494 | out_register_late_subsys: |
3495 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3496 | fib6_rules_init: |
433d49c3 DL |
3497 | fib6_rules_cleanup(); |
3498 | xfrm6_init: | |
433d49c3 | 3499 | xfrm6_fini(); |
2a0c451a TG |
3500 | out_fib6_init: |
3501 | fib6_gc_cleanup(); | |
8ed67789 DL |
3502 | out_register_subsys: |
3503 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3504 | out_register_inetpeer: |
3505 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3506 | out_dst_entries: |
3507 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3508 | out_kmem_cache: |
f2fc6a54 | 3509 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3510 | goto out; |
1da177e4 LT |
3511 | } |
3512 | ||
3513 | void ip6_route_cleanup(void) | |
3514 | { | |
8ed67789 | 3515 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3516 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3517 | fib6_rules_cleanup(); |
1da177e4 | 3518 | xfrm6_fini(); |
1da177e4 | 3519 | fib6_gc_cleanup(); |
c3426b47 | 3520 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3521 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3522 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3523 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3524 | } |