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 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 | 28 | #include <linux/errno.h> |
bc3b2d7f | 29 | #include <linux/export.h> |
1da177e4 LT |
30 | #include <linux/types.h> |
31 | #include <linux/times.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/sockios.h> | |
34 | #include <linux/net.h> | |
35 | #include <linux/route.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/in6.h> | |
7bc570c8 | 38 | #include <linux/mroute6.h> |
1da177e4 | 39 | #include <linux/init.h> |
1da177e4 | 40 | #include <linux/if_arp.h> |
1da177e4 LT |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> | |
5b7c931d | 43 | #include <linux/nsproxy.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
457c4cbc | 45 | #include <net/net_namespace.h> |
1da177e4 LT |
46 | #include <net/snmp.h> |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
55 | #include <net/xfrm.h> | |
8d71740c | 56 | #include <net/netevent.h> |
21713ebc | 57 | #include <net/netlink.h> |
1da177e4 LT |
58 | |
59 | #include <asm/uaccess.h> | |
60 | ||
61 | #ifdef CONFIG_SYSCTL | |
62 | #include <linux/sysctl.h> | |
63 | #endif | |
64 | ||
1716a961 | 65 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 66 | const struct in6_addr *dest); |
1da177e4 | 67 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 68 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 69 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
70 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
71 | static void ip6_dst_destroy(struct dst_entry *); | |
72 | static void ip6_dst_ifdown(struct dst_entry *, | |
73 | struct net_device *dev, int how); | |
569d3645 | 74 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
75 | |
76 | static int ip6_pkt_discard(struct sk_buff *skb); | |
77 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
78 | static void ip6_link_failure(struct sk_buff *skb); | |
79 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
80 | ||
70ceb4f5 | 81 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 82 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
83 | const struct in6_addr *prefix, int prefixlen, |
84 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 85 | unsigned int pref); |
efa2cea0 | 86 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
87 | const struct in6_addr *prefix, int prefixlen, |
88 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
89 | #endif |
90 | ||
06582540 DM |
91 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
92 | { | |
93 | struct rt6_info *rt = (struct rt6_info *) dst; | |
94 | struct inet_peer *peer; | |
95 | u32 *p = NULL; | |
96 | ||
8e2ec639 YZ |
97 | if (!(rt->dst.flags & DST_HOST)) |
98 | return NULL; | |
99 | ||
06582540 DM |
100 | if (!rt->rt6i_peer) |
101 | rt6_bind_peer(rt, 1); | |
102 | ||
103 | peer = rt->rt6i_peer; | |
104 | if (peer) { | |
105 | u32 *old_p = __DST_METRICS_PTR(old); | |
106 | unsigned long prev, new; | |
107 | ||
108 | p = peer->metrics; | |
109 | if (inet_metrics_new(peer)) | |
110 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
111 | ||
112 | new = (unsigned long) p; | |
113 | prev = cmpxchg(&dst->_metrics, old, new); | |
114 | ||
115 | if (prev != old) { | |
116 | p = __DST_METRICS_PTR(prev); | |
117 | if (prev & DST_METRICS_READ_ONLY) | |
118 | p = NULL; | |
119 | } | |
120 | } | |
121 | return p; | |
122 | } | |
123 | ||
39232973 DM |
124 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr) |
125 | { | |
126 | struct in6_addr *p = &rt->rt6i_gateway; | |
127 | ||
a7563f34 | 128 | if (!ipv6_addr_any(p)) |
39232973 DM |
129 | return (const void *) p; |
130 | return daddr; | |
131 | } | |
132 | ||
d3aaeb38 DM |
133 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
134 | { | |
39232973 DM |
135 | struct rt6_info *rt = (struct rt6_info *) dst; |
136 | struct neighbour *n; | |
137 | ||
138 | daddr = choose_neigh_daddr(rt, daddr); | |
139 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); | |
f83c7790 DM |
140 | if (n) |
141 | return n; | |
142 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
143 | } | |
144 | ||
8ade06c6 | 145 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
f83c7790 | 146 | { |
8ade06c6 DM |
147 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
148 | if (!n) { | |
149 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); | |
150 | if (IS_ERR(n)) | |
151 | return PTR_ERR(n); | |
152 | } | |
f83c7790 DM |
153 | dst_set_neighbour(&rt->dst, n); |
154 | ||
155 | return 0; | |
d3aaeb38 DM |
156 | } |
157 | ||
9a7ec3a9 | 158 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 159 | .family = AF_INET6, |
09640e63 | 160 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
161 | .gc = ip6_dst_gc, |
162 | .gc_thresh = 1024, | |
163 | .check = ip6_dst_check, | |
0dbaee3b | 164 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 165 | .mtu = ip6_mtu, |
06582540 | 166 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
167 | .destroy = ip6_dst_destroy, |
168 | .ifdown = ip6_dst_ifdown, | |
169 | .negative_advice = ip6_negative_advice, | |
170 | .link_failure = ip6_link_failure, | |
171 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 172 | .local_out = __ip6_local_out, |
d3aaeb38 | 173 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
174 | }; |
175 | ||
ebb762f2 | 176 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 177 | { |
618f9bc7 SK |
178 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
179 | ||
180 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
181 | } |
182 | ||
14e50e57 DM |
183 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
184 | { | |
185 | } | |
186 | ||
0972ddb2 HB |
187 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
188 | unsigned long old) | |
189 | { | |
190 | return NULL; | |
191 | } | |
192 | ||
14e50e57 DM |
193 | static struct dst_ops ip6_dst_blackhole_ops = { |
194 | .family = AF_INET6, | |
09640e63 | 195 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
196 | .destroy = ip6_dst_destroy, |
197 | .check = ip6_dst_check, | |
ebb762f2 | 198 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 199 | .default_advmss = ip6_default_advmss, |
14e50e57 | 200 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 201 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 202 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
203 | }; |
204 | ||
62fa8a84 DM |
205 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
206 | [RTAX_HOPLIMIT - 1] = 255, | |
207 | }; | |
208 | ||
bdb3289f | 209 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
210 | .dst = { |
211 | .__refcnt = ATOMIC_INIT(1), | |
212 | .__use = 1, | |
213 | .obsolete = -1, | |
214 | .error = -ENETUNREACH, | |
d8d1f30b CG |
215 | .input = ip6_pkt_discard, |
216 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
217 | }, |
218 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 219 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
220 | .rt6i_metric = ~(u32) 0, |
221 | .rt6i_ref = ATOMIC_INIT(1), | |
222 | }; | |
223 | ||
101367c2 TG |
224 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
225 | ||
6723ab54 DM |
226 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
227 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 228 | |
280a34c8 | 229 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
230 | .dst = { |
231 | .__refcnt = ATOMIC_INIT(1), | |
232 | .__use = 1, | |
233 | .obsolete = -1, | |
234 | .error = -EACCES, | |
d8d1f30b CG |
235 | .input = ip6_pkt_prohibit, |
236 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
237 | }, |
238 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 239 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
240 | .rt6i_metric = ~(u32) 0, |
241 | .rt6i_ref = ATOMIC_INIT(1), | |
242 | }; | |
243 | ||
bdb3289f | 244 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
245 | .dst = { |
246 | .__refcnt = ATOMIC_INIT(1), | |
247 | .__use = 1, | |
248 | .obsolete = -1, | |
249 | .error = -EINVAL, | |
d8d1f30b CG |
250 | .input = dst_discard, |
251 | .output = dst_discard, | |
101367c2 TG |
252 | }, |
253 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 254 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
255 | .rt6i_metric = ~(u32) 0, |
256 | .rt6i_ref = ATOMIC_INIT(1), | |
257 | }; | |
258 | ||
259 | #endif | |
260 | ||
1da177e4 | 261 | /* allocate dst with ip6_dst_ops */ |
5c1e6aa3 | 262 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops, |
957c665f DM |
263 | struct net_device *dev, |
264 | int flags) | |
1da177e4 | 265 | { |
957c665f | 266 | struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags); |
cf911662 | 267 | |
38308473 | 268 | if (rt) |
fbe58186 | 269 | memset(&rt->rt6i_table, 0, |
38308473 | 270 | sizeof(*rt) - sizeof(struct dst_entry)); |
cf911662 DM |
271 | |
272 | return rt; | |
1da177e4 LT |
273 | } |
274 | ||
275 | static void ip6_dst_destroy(struct dst_entry *dst) | |
276 | { | |
277 | struct rt6_info *rt = (struct rt6_info *)dst; | |
278 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 279 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 | 280 | |
8e2ec639 YZ |
281 | if (!(rt->dst.flags & DST_HOST)) |
282 | dst_destroy_metrics_generic(dst); | |
283 | ||
38308473 | 284 | if (idev) { |
1da177e4 LT |
285 | rt->rt6i_idev = NULL; |
286 | in6_dev_put(idev); | |
1ab1457c | 287 | } |
1716a961 G |
288 | |
289 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) | |
290 | dst_release(dst->from); | |
291 | ||
b3419363 | 292 | if (peer) { |
b3419363 DM |
293 | rt->rt6i_peer = NULL; |
294 | inet_putpeer(peer); | |
295 | } | |
296 | } | |
297 | ||
6431cbc2 DM |
298 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
299 | ||
300 | static u32 rt6_peer_genid(void) | |
301 | { | |
302 | return atomic_read(&__rt6_peer_genid); | |
303 | } | |
304 | ||
b3419363 DM |
305 | void rt6_bind_peer(struct rt6_info *rt, int create) |
306 | { | |
307 | struct inet_peer *peer; | |
308 | ||
b3419363 DM |
309 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
310 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
311 | inet_putpeer(peer); | |
6431cbc2 DM |
312 | else |
313 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1da177e4 LT |
314 | } |
315 | ||
316 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
317 | int how) | |
318 | { | |
319 | struct rt6_info *rt = (struct rt6_info *)dst; | |
320 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 321 | struct net_device *loopback_dev = |
c346dca1 | 322 | dev_net(dev)->loopback_dev; |
1da177e4 | 323 | |
38308473 | 324 | if (dev != loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 DL |
325 | struct inet6_dev *loopback_idev = |
326 | in6_dev_get(loopback_dev); | |
38308473 | 327 | if (loopback_idev) { |
1da177e4 LT |
328 | rt->rt6i_idev = loopback_idev; |
329 | in6_dev_put(idev); | |
330 | } | |
331 | } | |
332 | } | |
333 | ||
334 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
335 | { | |
1716a961 G |
336 | struct rt6_info *ort = NULL; |
337 | ||
338 | if (rt->rt6i_flags & RTF_EXPIRES) { | |
339 | if (time_after(jiffies, rt->dst.expires)) | |
340 | return 1; | |
341 | } else if (rt->dst.from) { | |
342 | ort = (struct rt6_info *) rt->dst.from; | |
343 | return (ort->rt6i_flags & RTF_EXPIRES) && | |
344 | time_after(jiffies, ort->dst.expires); | |
345 | } | |
346 | return 0; | |
1da177e4 LT |
347 | } |
348 | ||
b71d1d42 | 349 | static inline int rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 350 | { |
a02cec21 ED |
351 | return ipv6_addr_type(daddr) & |
352 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
353 | } |
354 | ||
1da177e4 | 355 | /* |
c71099ac | 356 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
357 | */ |
358 | ||
8ed67789 DL |
359 | static inline struct rt6_info *rt6_device_match(struct net *net, |
360 | struct rt6_info *rt, | |
b71d1d42 | 361 | const struct in6_addr *saddr, |
1da177e4 | 362 | int oif, |
d420895e | 363 | int flags) |
1da177e4 LT |
364 | { |
365 | struct rt6_info *local = NULL; | |
366 | struct rt6_info *sprt; | |
367 | ||
dd3abc4e YH |
368 | if (!oif && ipv6_addr_any(saddr)) |
369 | goto out; | |
370 | ||
d8d1f30b | 371 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 372 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
373 | |
374 | if (oif) { | |
1da177e4 LT |
375 | if (dev->ifindex == oif) |
376 | return sprt; | |
377 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 378 | if (!sprt->rt6i_idev || |
1da177e4 | 379 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 380 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 381 | continue; |
1ab1457c | 382 | if (local && (!oif || |
1da177e4 LT |
383 | local->rt6i_idev->dev->ifindex == oif)) |
384 | continue; | |
385 | } | |
386 | local = sprt; | |
387 | } | |
dd3abc4e YH |
388 | } else { |
389 | if (ipv6_chk_addr(net, saddr, dev, | |
390 | flags & RT6_LOOKUP_F_IFACE)) | |
391 | return sprt; | |
1da177e4 | 392 | } |
dd3abc4e | 393 | } |
1da177e4 | 394 | |
dd3abc4e | 395 | if (oif) { |
1da177e4 LT |
396 | if (local) |
397 | return local; | |
398 | ||
d420895e | 399 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 400 | return net->ipv6.ip6_null_entry; |
1da177e4 | 401 | } |
dd3abc4e | 402 | out: |
1da177e4 LT |
403 | return rt; |
404 | } | |
405 | ||
27097255 YH |
406 | #ifdef CONFIG_IPV6_ROUTER_PREF |
407 | static void rt6_probe(struct rt6_info *rt) | |
408 | { | |
f2c31e32 | 409 | struct neighbour *neigh; |
27097255 YH |
410 | /* |
411 | * Okay, this does not seem to be appropriate | |
412 | * for now, however, we need to check if it | |
413 | * is really so; aka Router Reachability Probing. | |
414 | * | |
415 | * Router Reachability Probe MUST be rate-limited | |
416 | * to no more than one per minute. | |
417 | */ | |
f2c31e32 | 418 | rcu_read_lock(); |
27217455 | 419 | neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL; |
27097255 | 420 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
f2c31e32 | 421 | goto out; |
27097255 YH |
422 | read_lock_bh(&neigh->lock); |
423 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 424 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
425 | struct in6_addr mcaddr; |
426 | struct in6_addr *target; | |
427 | ||
428 | neigh->updated = jiffies; | |
429 | read_unlock_bh(&neigh->lock); | |
430 | ||
431 | target = (struct in6_addr *)&neigh->primary_key; | |
432 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 433 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 434 | } else { |
27097255 | 435 | read_unlock_bh(&neigh->lock); |
f2c31e32 ED |
436 | } |
437 | out: | |
438 | rcu_read_unlock(); | |
27097255 YH |
439 | } |
440 | #else | |
441 | static inline void rt6_probe(struct rt6_info *rt) | |
442 | { | |
27097255 YH |
443 | } |
444 | #endif | |
445 | ||
1da177e4 | 446 | /* |
554cfb7e | 447 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 448 | */ |
b6f99a21 | 449 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 450 | { |
d1918542 | 451 | struct net_device *dev = rt->dst.dev; |
161980f4 | 452 | if (!oif || dev->ifindex == oif) |
554cfb7e | 453 | return 2; |
161980f4 DM |
454 | if ((dev->flags & IFF_LOOPBACK) && |
455 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
456 | return 1; | |
457 | return 0; | |
554cfb7e | 458 | } |
1da177e4 | 459 | |
b6f99a21 | 460 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 461 | { |
f2c31e32 | 462 | struct neighbour *neigh; |
398bcbeb | 463 | int m; |
f2c31e32 ED |
464 | |
465 | rcu_read_lock(); | |
27217455 | 466 | neigh = dst_get_neighbour_noref(&rt->dst); |
4d0c5911 YH |
467 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
468 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
469 | m = 1; | |
470 | else if (neigh) { | |
554cfb7e YH |
471 | read_lock_bh(&neigh->lock); |
472 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 473 | m = 2; |
398bcbeb YH |
474 | #ifdef CONFIG_IPV6_ROUTER_PREF |
475 | else if (neigh->nud_state & NUD_FAILED) | |
476 | m = 0; | |
477 | #endif | |
478 | else | |
ea73ee23 | 479 | m = 1; |
554cfb7e | 480 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
481 | } else |
482 | m = 0; | |
f2c31e32 | 483 | rcu_read_unlock(); |
554cfb7e | 484 | return m; |
1da177e4 LT |
485 | } |
486 | ||
554cfb7e YH |
487 | static int rt6_score_route(struct rt6_info *rt, int oif, |
488 | int strict) | |
1da177e4 | 489 | { |
4d0c5911 | 490 | int m, n; |
1ab1457c | 491 | |
4d0c5911 | 492 | m = rt6_check_dev(rt, oif); |
77d16f45 | 493 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 494 | return -1; |
ebacaaa0 YH |
495 | #ifdef CONFIG_IPV6_ROUTER_PREF |
496 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
497 | #endif | |
4d0c5911 | 498 | n = rt6_check_neigh(rt); |
557e92ef | 499 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
500 | return -1; |
501 | return m; | |
502 | } | |
503 | ||
f11e6659 DM |
504 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
505 | int *mpri, struct rt6_info *match) | |
554cfb7e | 506 | { |
f11e6659 DM |
507 | int m; |
508 | ||
509 | if (rt6_check_expired(rt)) | |
510 | goto out; | |
511 | ||
512 | m = rt6_score_route(rt, oif, strict); | |
513 | if (m < 0) | |
514 | goto out; | |
515 | ||
516 | if (m > *mpri) { | |
517 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
518 | rt6_probe(match); | |
519 | *mpri = m; | |
520 | match = rt; | |
521 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
522 | rt6_probe(rt); | |
523 | } | |
524 | ||
525 | out: | |
526 | return match; | |
527 | } | |
528 | ||
529 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
530 | struct rt6_info *rr_head, | |
531 | u32 metric, int oif, int strict) | |
532 | { | |
533 | struct rt6_info *rt, *match; | |
554cfb7e | 534 | int mpri = -1; |
1da177e4 | 535 | |
f11e6659 DM |
536 | match = NULL; |
537 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 538 | rt = rt->dst.rt6_next) |
f11e6659 DM |
539 | match = find_match(rt, oif, strict, &mpri, match); |
540 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 541 | rt = rt->dst.rt6_next) |
f11e6659 | 542 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 543 | |
f11e6659 DM |
544 | return match; |
545 | } | |
1da177e4 | 546 | |
f11e6659 DM |
547 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
548 | { | |
549 | struct rt6_info *match, *rt0; | |
8ed67789 | 550 | struct net *net; |
1da177e4 | 551 | |
f11e6659 DM |
552 | rt0 = fn->rr_ptr; |
553 | if (!rt0) | |
554 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 555 | |
f11e6659 | 556 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 557 | |
554cfb7e | 558 | if (!match && |
f11e6659 | 559 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 560 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 561 | |
554cfb7e | 562 | /* no entries matched; do round-robin */ |
f11e6659 DM |
563 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
564 | next = fn->leaf; | |
565 | ||
566 | if (next != rt0) | |
567 | fn->rr_ptr = next; | |
1da177e4 | 568 | } |
1da177e4 | 569 | |
d1918542 | 570 | net = dev_net(rt0->dst.dev); |
a02cec21 | 571 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
572 | } |
573 | ||
70ceb4f5 YH |
574 | #ifdef CONFIG_IPV6_ROUTE_INFO |
575 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 576 | const struct in6_addr *gwaddr) |
70ceb4f5 | 577 | { |
c346dca1 | 578 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
579 | struct route_info *rinfo = (struct route_info *) opt; |
580 | struct in6_addr prefix_buf, *prefix; | |
581 | unsigned int pref; | |
4bed72e4 | 582 | unsigned long lifetime; |
70ceb4f5 YH |
583 | struct rt6_info *rt; |
584 | ||
585 | if (len < sizeof(struct route_info)) { | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
589 | /* Sanity check for prefix_len and length */ | |
590 | if (rinfo->length > 3) { | |
591 | return -EINVAL; | |
592 | } else if (rinfo->prefix_len > 128) { | |
593 | return -EINVAL; | |
594 | } else if (rinfo->prefix_len > 64) { | |
595 | if (rinfo->length < 2) { | |
596 | return -EINVAL; | |
597 | } | |
598 | } else if (rinfo->prefix_len > 0) { | |
599 | if (rinfo->length < 1) { | |
600 | return -EINVAL; | |
601 | } | |
602 | } | |
603 | ||
604 | pref = rinfo->route_pref; | |
605 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 606 | return -EINVAL; |
70ceb4f5 | 607 | |
4bed72e4 | 608 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
609 | |
610 | if (rinfo->length == 3) | |
611 | prefix = (struct in6_addr *)rinfo->prefix; | |
612 | else { | |
613 | /* this function is safe */ | |
614 | ipv6_addr_prefix(&prefix_buf, | |
615 | (struct in6_addr *)rinfo->prefix, | |
616 | rinfo->prefix_len); | |
617 | prefix = &prefix_buf; | |
618 | } | |
619 | ||
efa2cea0 DL |
620 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
621 | dev->ifindex); | |
70ceb4f5 YH |
622 | |
623 | if (rt && !lifetime) { | |
e0a1ad73 | 624 | ip6_del_rt(rt); |
70ceb4f5 YH |
625 | rt = NULL; |
626 | } | |
627 | ||
628 | if (!rt && lifetime) | |
efa2cea0 | 629 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
630 | pref); |
631 | else if (rt) | |
632 | rt->rt6i_flags = RTF_ROUTEINFO | | |
633 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
634 | ||
635 | if (rt) { | |
1716a961 G |
636 | if (!addrconf_finite_timeout(lifetime)) |
637 | rt6_clean_expires(rt); | |
638 | else | |
639 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
640 | ||
d8d1f30b | 641 | dst_release(&rt->dst); |
70ceb4f5 YH |
642 | } |
643 | return 0; | |
644 | } | |
645 | #endif | |
646 | ||
8ed67789 | 647 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 648 | do { \ |
8ed67789 | 649 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 650 | struct fib6_node *pn; \ |
e0eda7bb | 651 | while (1) { \ |
982f56f3 YH |
652 | if (fn->fn_flags & RTN_TL_ROOT) \ |
653 | goto out; \ | |
654 | pn = fn->parent; \ | |
655 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 656 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
657 | else \ |
658 | fn = pn; \ | |
659 | if (fn->fn_flags & RTN_RTINFO) \ | |
660 | goto restart; \ | |
c71099ac | 661 | } \ |
c71099ac | 662 | } \ |
38308473 | 663 | } while (0) |
c71099ac | 664 | |
8ed67789 DL |
665 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
666 | struct fib6_table *table, | |
4c9483b2 | 667 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
668 | { |
669 | struct fib6_node *fn; | |
670 | struct rt6_info *rt; | |
671 | ||
c71099ac | 672 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 673 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
674 | restart: |
675 | rt = fn->leaf; | |
4c9483b2 DM |
676 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
677 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 678 | out: |
d8d1f30b | 679 | dst_use(&rt->dst, jiffies); |
c71099ac | 680 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
681 | return rt; |
682 | ||
683 | } | |
684 | ||
ea6e574e FW |
685 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
686 | int flags) | |
687 | { | |
688 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
689 | } | |
690 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
691 | ||
9acd9f3a YH |
692 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
693 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 694 | { |
4c9483b2 DM |
695 | struct flowi6 fl6 = { |
696 | .flowi6_oif = oif, | |
697 | .daddr = *daddr, | |
c71099ac TG |
698 | }; |
699 | struct dst_entry *dst; | |
77d16f45 | 700 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 701 | |
adaa70bb | 702 | if (saddr) { |
4c9483b2 | 703 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
704 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
705 | } | |
706 | ||
4c9483b2 | 707 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
708 | if (dst->error == 0) |
709 | return (struct rt6_info *) dst; | |
710 | ||
711 | dst_release(dst); | |
712 | ||
1da177e4 LT |
713 | return NULL; |
714 | } | |
715 | ||
7159039a YH |
716 | EXPORT_SYMBOL(rt6_lookup); |
717 | ||
c71099ac | 718 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
719 | It takes new route entry, the addition fails by any reason the |
720 | route is freed. In any case, if caller does not hold it, it may | |
721 | be destroyed. | |
722 | */ | |
723 | ||
86872cb5 | 724 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
725 | { |
726 | int err; | |
c71099ac | 727 | struct fib6_table *table; |
1da177e4 | 728 | |
c71099ac TG |
729 | table = rt->rt6i_table; |
730 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 731 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 732 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
733 | |
734 | return err; | |
735 | } | |
736 | ||
40e22e8f TG |
737 | int ip6_ins_rt(struct rt6_info *rt) |
738 | { | |
4d1169c1 | 739 | struct nl_info info = { |
d1918542 | 740 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 741 | }; |
528c4ceb | 742 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
743 | } |
744 | ||
1716a961 | 745 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 746 | const struct in6_addr *daddr, |
b71d1d42 | 747 | const struct in6_addr *saddr) |
1da177e4 | 748 | { |
1da177e4 LT |
749 | struct rt6_info *rt; |
750 | ||
751 | /* | |
752 | * Clone the route. | |
753 | */ | |
754 | ||
21efcfa0 | 755 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
756 | |
757 | if (rt) { | |
14deae41 DM |
758 | int attempts = !in_softirq(); |
759 | ||
38308473 | 760 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 761 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 762 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 763 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 764 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 765 | } |
1da177e4 | 766 | |
1da177e4 | 767 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
768 | |
769 | #ifdef CONFIG_IPV6_SUBTREES | |
770 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 771 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
772 | rt->rt6i_src.plen = 128; |
773 | } | |
774 | #endif | |
775 | ||
14deae41 | 776 | retry: |
8ade06c6 | 777 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
d1918542 | 778 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
779 | int saved_rt_min_interval = |
780 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
781 | int saved_rt_elasticity = | |
782 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
783 | ||
784 | if (attempts-- > 0) { | |
785 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
786 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
787 | ||
86393e52 | 788 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
789 | |
790 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
791 | saved_rt_elasticity; | |
792 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
793 | saved_rt_min_interval; | |
794 | goto retry; | |
795 | } | |
796 | ||
797 | if (net_ratelimit()) | |
798 | printk(KERN_WARNING | |
7e1b33e5 | 799 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 800 | dst_free(&rt->dst); |
14deae41 DM |
801 | return NULL; |
802 | } | |
95a9a5ba | 803 | } |
1da177e4 | 804 | |
95a9a5ba YH |
805 | return rt; |
806 | } | |
1da177e4 | 807 | |
21efcfa0 ED |
808 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
809 | const struct in6_addr *daddr) | |
299d9939 | 810 | { |
21efcfa0 ED |
811 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
812 | ||
299d9939 | 813 | if (rt) { |
299d9939 | 814 | rt->rt6i_flags |= RTF_CACHE; |
27217455 | 815 | dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst))); |
299d9939 YH |
816 | } |
817 | return rt; | |
818 | } | |
819 | ||
8ed67789 | 820 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 821 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
822 | { |
823 | struct fib6_node *fn; | |
519fbd87 | 824 | struct rt6_info *rt, *nrt; |
c71099ac | 825 | int strict = 0; |
1da177e4 | 826 | int attempts = 3; |
519fbd87 | 827 | int err; |
53b7997f | 828 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 829 | |
77d16f45 | 830 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
831 | |
832 | relookup: | |
c71099ac | 833 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 834 | |
8238dd06 | 835 | restart_2: |
4c9483b2 | 836 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
837 | |
838 | restart: | |
4acad72d | 839 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 840 | |
4c9483b2 | 841 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 842 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 843 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 844 | goto out; |
1da177e4 | 845 | |
d8d1f30b | 846 | dst_hold(&rt->dst); |
c71099ac | 847 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 848 | |
27217455 | 849 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 850 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 851 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 852 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
853 | else |
854 | goto out2; | |
e40cf353 | 855 | |
d8d1f30b | 856 | dst_release(&rt->dst); |
8ed67789 | 857 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 858 | |
d8d1f30b | 859 | dst_hold(&rt->dst); |
519fbd87 | 860 | if (nrt) { |
40e22e8f | 861 | err = ip6_ins_rt(nrt); |
519fbd87 | 862 | if (!err) |
1da177e4 | 863 | goto out2; |
1da177e4 | 864 | } |
1da177e4 | 865 | |
519fbd87 YH |
866 | if (--attempts <= 0) |
867 | goto out2; | |
868 | ||
869 | /* | |
c71099ac | 870 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
871 | * released someone could insert this route. Relookup. |
872 | */ | |
d8d1f30b | 873 | dst_release(&rt->dst); |
519fbd87 YH |
874 | goto relookup; |
875 | ||
876 | out: | |
8238dd06 YH |
877 | if (reachable) { |
878 | reachable = 0; | |
879 | goto restart_2; | |
880 | } | |
d8d1f30b | 881 | dst_hold(&rt->dst); |
c71099ac | 882 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 883 | out2: |
d8d1f30b CG |
884 | rt->dst.lastuse = jiffies; |
885 | rt->dst.__use++; | |
c71099ac TG |
886 | |
887 | return rt; | |
1da177e4 LT |
888 | } |
889 | ||
8ed67789 | 890 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 891 | struct flowi6 *fl6, int flags) |
4acad72d | 892 | { |
4c9483b2 | 893 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
894 | } |
895 | ||
72331bc0 SL |
896 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
897 | struct net_device *dev, | |
898 | struct flowi6 *fl6, int flags) | |
899 | { | |
900 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
901 | flags |= RT6_LOOKUP_F_IFACE; | |
902 | ||
903 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
904 | } | |
905 | ||
c71099ac TG |
906 | void ip6_route_input(struct sk_buff *skb) |
907 | { | |
b71d1d42 | 908 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 909 | struct net *net = dev_net(skb->dev); |
adaa70bb | 910 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
911 | struct flowi6 fl6 = { |
912 | .flowi6_iif = skb->dev->ifindex, | |
913 | .daddr = iph->daddr, | |
914 | .saddr = iph->saddr, | |
38308473 | 915 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
916 | .flowi6_mark = skb->mark, |
917 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 918 | }; |
adaa70bb | 919 | |
72331bc0 | 920 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
921 | } |
922 | ||
8ed67789 | 923 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 924 | struct flowi6 *fl6, int flags) |
1da177e4 | 925 | { |
4c9483b2 | 926 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
927 | } |
928 | ||
9c7a4f9c | 929 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 930 | struct flowi6 *fl6) |
c71099ac TG |
931 | { |
932 | int flags = 0; | |
933 | ||
4c9483b2 | 934 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 935 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 936 | |
4c9483b2 | 937 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 938 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
939 | else if (sk) |
940 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 941 | |
4c9483b2 | 942 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
943 | } |
944 | ||
7159039a | 945 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 946 | |
2774c131 | 947 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 948 | { |
5c1e6aa3 | 949 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
950 | struct dst_entry *new = NULL; |
951 | ||
5c1e6aa3 | 952 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 953 | if (rt) { |
cf911662 DM |
954 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
955 | ||
d8d1f30b | 956 | new = &rt->dst; |
14e50e57 | 957 | |
14e50e57 | 958 | new->__use = 1; |
352e512c HX |
959 | new->input = dst_discard; |
960 | new->output = dst_discard; | |
14e50e57 | 961 | |
21efcfa0 ED |
962 | if (dst_metrics_read_only(&ort->dst)) |
963 | new->_metrics = ort->dst._metrics; | |
964 | else | |
965 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
966 | rt->rt6i_idev = ort->rt6i_idev; |
967 | if (rt->rt6i_idev) | |
968 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 969 | |
4e3fd7a0 | 970 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
971 | rt->rt6i_flags = ort->rt6i_flags; |
972 | rt6_clean_expires(rt); | |
14e50e57 DM |
973 | rt->rt6i_metric = 0; |
974 | ||
975 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
976 | #ifdef CONFIG_IPV6_SUBTREES | |
977 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
978 | #endif | |
979 | ||
980 | dst_free(new); | |
981 | } | |
982 | ||
69ead7af DM |
983 | dst_release(dst_orig); |
984 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 985 | } |
14e50e57 | 986 | |
1da177e4 LT |
987 | /* |
988 | * Destination cache support functions | |
989 | */ | |
990 | ||
991 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
992 | { | |
993 | struct rt6_info *rt; | |
994 | ||
995 | rt = (struct rt6_info *) dst; | |
996 | ||
6431cbc2 DM |
997 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
998 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
999 | if (!rt->rt6i_peer) | |
1000 | rt6_bind_peer(rt, 0); | |
1001 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1002 | } | |
1da177e4 | 1003 | return dst; |
6431cbc2 | 1004 | } |
1da177e4 LT |
1005 | return NULL; |
1006 | } | |
1007 | ||
1008 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1009 | { | |
1010 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1011 | ||
1012 | if (rt) { | |
54c1a859 YH |
1013 | if (rt->rt6i_flags & RTF_CACHE) { |
1014 | if (rt6_check_expired(rt)) { | |
1015 | ip6_del_rt(rt); | |
1016 | dst = NULL; | |
1017 | } | |
1018 | } else { | |
1da177e4 | 1019 | dst_release(dst); |
54c1a859 YH |
1020 | dst = NULL; |
1021 | } | |
1da177e4 | 1022 | } |
54c1a859 | 1023 | return dst; |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | static void ip6_link_failure(struct sk_buff *skb) | |
1027 | { | |
1028 | struct rt6_info *rt; | |
1029 | ||
3ffe533c | 1030 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1031 | |
adf30907 | 1032 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1033 | if (rt) { |
1716a961 G |
1034 | if (rt->rt6i_flags & RTF_CACHE) |
1035 | rt6_update_expires(rt, 0); | |
1036 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1da177e4 LT |
1037 | rt->rt6i_node->fn_sernum = -1; |
1038 | } | |
1039 | } | |
1040 | ||
1041 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1042 | { | |
1043 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1044 | ||
1045 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
1046 | rt6->rt6i_flags |= RTF_MODIFIED; | |
1047 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1048 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1049 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1050 | features |= RTAX_FEATURE_ALLFRAG; |
1051 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1052 | } |
defb3519 | 1053 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
1054 | } |
1055 | } | |
1056 | ||
0dbaee3b | 1057 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1058 | { |
0dbaee3b DM |
1059 | struct net_device *dev = dst->dev; |
1060 | unsigned int mtu = dst_mtu(dst); | |
1061 | struct net *net = dev_net(dev); | |
1062 | ||
1da177e4 LT |
1063 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1064 | ||
5578689a DL |
1065 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1066 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1067 | |
1068 | /* | |
1ab1457c YH |
1069 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1070 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1071 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1072 | * rely only on pmtu discovery" |
1073 | */ | |
1074 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1075 | mtu = IPV6_MAXPLEN; | |
1076 | return mtu; | |
1077 | } | |
1078 | ||
ebb762f2 | 1079 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1080 | { |
d33e4553 | 1081 | struct inet6_dev *idev; |
618f9bc7 SK |
1082 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1083 | ||
1084 | if (mtu) | |
1085 | return mtu; | |
1086 | ||
1087 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1088 | |
1089 | rcu_read_lock(); | |
1090 | idev = __in6_dev_get(dst->dev); | |
1091 | if (idev) | |
1092 | mtu = idev->cnf.mtu6; | |
1093 | rcu_read_unlock(); | |
1094 | ||
1095 | return mtu; | |
1096 | } | |
1097 | ||
3b00944c YH |
1098 | static struct dst_entry *icmp6_dst_gc_list; |
1099 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1100 | |
3b00944c | 1101 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1102 | struct neighbour *neigh, |
87a11578 | 1103 | struct flowi6 *fl6) |
1da177e4 | 1104 | { |
87a11578 | 1105 | struct dst_entry *dst; |
1da177e4 LT |
1106 | struct rt6_info *rt; |
1107 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1108 | struct net *net = dev_net(dev); |
1da177e4 | 1109 | |
38308473 | 1110 | if (unlikely(!idev)) |
122bdf67 | 1111 | return ERR_PTR(-ENODEV); |
1da177e4 | 1112 | |
957c665f | 1113 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0); |
38308473 | 1114 | if (unlikely(!rt)) { |
1da177e4 | 1115 | in6_dev_put(idev); |
87a11578 | 1116 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1117 | goto out; |
1118 | } | |
1119 | ||
1da177e4 LT |
1120 | if (neigh) |
1121 | neigh_hold(neigh); | |
14deae41 | 1122 | else { |
f83c7790 | 1123 | neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr); |
b43faac6 | 1124 | if (IS_ERR(neigh)) { |
252c3d84 | 1125 | in6_dev_put(idev); |
b43faac6 DM |
1126 | dst_free(&rt->dst); |
1127 | return ERR_CAST(neigh); | |
1128 | } | |
14deae41 | 1129 | } |
1da177e4 | 1130 | |
8e2ec639 YZ |
1131 | rt->dst.flags |= DST_HOST; |
1132 | rt->dst.output = ip6_output; | |
69cce1d1 | 1133 | dst_set_neighbour(&rt->dst, neigh); |
d8d1f30b | 1134 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1135 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1136 | rt->rt6i_dst.plen = 128; |
1137 | rt->rt6i_idev = idev; | |
7011687f | 1138 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1139 | |
3b00944c | 1140 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1141 | rt->dst.next = icmp6_dst_gc_list; |
1142 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1143 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1144 | |
5578689a | 1145 | fib6_force_start_gc(net); |
1da177e4 | 1146 | |
87a11578 DM |
1147 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1148 | ||
1da177e4 | 1149 | out: |
87a11578 | 1150 | return dst; |
1da177e4 LT |
1151 | } |
1152 | ||
3d0f24a7 | 1153 | int icmp6_dst_gc(void) |
1da177e4 | 1154 | { |
e9476e95 | 1155 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1156 | int more = 0; |
1da177e4 | 1157 | |
3b00944c YH |
1158 | spin_lock_bh(&icmp6_dst_lock); |
1159 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1160 | |
1da177e4 LT |
1161 | while ((dst = *pprev) != NULL) { |
1162 | if (!atomic_read(&dst->__refcnt)) { | |
1163 | *pprev = dst->next; | |
1164 | dst_free(dst); | |
1da177e4 LT |
1165 | } else { |
1166 | pprev = &dst->next; | |
3d0f24a7 | 1167 | ++more; |
1da177e4 LT |
1168 | } |
1169 | } | |
1170 | ||
3b00944c | 1171 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1172 | |
3d0f24a7 | 1173 | return more; |
1da177e4 LT |
1174 | } |
1175 | ||
1e493d19 DM |
1176 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1177 | void *arg) | |
1178 | { | |
1179 | struct dst_entry *dst, **pprev; | |
1180 | ||
1181 | spin_lock_bh(&icmp6_dst_lock); | |
1182 | pprev = &icmp6_dst_gc_list; | |
1183 | while ((dst = *pprev) != NULL) { | |
1184 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1185 | if (func(rt, arg)) { | |
1186 | *pprev = dst->next; | |
1187 | dst_free(dst); | |
1188 | } else { | |
1189 | pprev = &dst->next; | |
1190 | } | |
1191 | } | |
1192 | spin_unlock_bh(&icmp6_dst_lock); | |
1193 | } | |
1194 | ||
569d3645 | 1195 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1196 | { |
1da177e4 | 1197 | unsigned long now = jiffies; |
86393e52 | 1198 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1199 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1200 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1201 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1202 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1203 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1204 | int entries; |
7019b78e | 1205 | |
fc66f95c | 1206 | entries = dst_entries_get_fast(ops); |
7019b78e | 1207 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1208 | entries <= rt_max_size) |
1da177e4 LT |
1209 | goto out; |
1210 | ||
6891a346 BT |
1211 | net->ipv6.ip6_rt_gc_expire++; |
1212 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1213 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1214 | entries = dst_entries_get_slow(ops); |
1215 | if (entries < ops->gc_thresh) | |
7019b78e | 1216 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1217 | out: |
7019b78e | 1218 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1219 | return entries > rt_max_size; |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1223 | but results in cleaner routing tables. | |
1224 | ||
1225 | Remove it only when all the things will work! | |
1226 | */ | |
1227 | ||
6b75d090 | 1228 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1229 | { |
5170ae82 | 1230 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1231 | if (hoplimit == 0) { |
6b75d090 | 1232 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1233 | struct inet6_dev *idev; |
1234 | ||
1235 | rcu_read_lock(); | |
1236 | idev = __in6_dev_get(dev); | |
1237 | if (idev) | |
6b75d090 | 1238 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1239 | else |
53b7997f | 1240 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1241 | rcu_read_unlock(); |
1da177e4 LT |
1242 | } |
1243 | return hoplimit; | |
1244 | } | |
abbf46ae | 1245 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1246 | |
1247 | /* | |
1248 | * | |
1249 | */ | |
1250 | ||
86872cb5 | 1251 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1252 | { |
1253 | int err; | |
5578689a | 1254 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1255 | struct rt6_info *rt = NULL; |
1256 | struct net_device *dev = NULL; | |
1257 | struct inet6_dev *idev = NULL; | |
c71099ac | 1258 | struct fib6_table *table; |
1da177e4 LT |
1259 | int addr_type; |
1260 | ||
86872cb5 | 1261 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1262 | return -EINVAL; |
1263 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1264 | if (cfg->fc_src_len) |
1da177e4 LT |
1265 | return -EINVAL; |
1266 | #endif | |
86872cb5 | 1267 | if (cfg->fc_ifindex) { |
1da177e4 | 1268 | err = -ENODEV; |
5578689a | 1269 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1270 | if (!dev) |
1271 | goto out; | |
1272 | idev = in6_dev_get(dev); | |
1273 | if (!idev) | |
1274 | goto out; | |
1275 | } | |
1276 | ||
86872cb5 TG |
1277 | if (cfg->fc_metric == 0) |
1278 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1279 | |
d71314b4 | 1280 | err = -ENOBUFS; |
38308473 DM |
1281 | if (cfg->fc_nlinfo.nlh && |
1282 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1283 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1284 | if (!table) { |
d71314b4 MV |
1285 | printk(KERN_WARNING "IPv6: NLM_F_CREATE should be specified when creating new route\n"); |
1286 | table = fib6_new_table(net, cfg->fc_table); | |
1287 | } | |
1288 | } else { | |
1289 | table = fib6_new_table(net, cfg->fc_table); | |
1290 | } | |
38308473 DM |
1291 | |
1292 | if (!table) | |
c71099ac | 1293 | goto out; |
c71099ac | 1294 | |
957c665f | 1295 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT); |
1da177e4 | 1296 | |
38308473 | 1297 | if (!rt) { |
1da177e4 LT |
1298 | err = -ENOMEM; |
1299 | goto out; | |
1300 | } | |
1301 | ||
d8d1f30b | 1302 | rt->dst.obsolete = -1; |
1716a961 G |
1303 | |
1304 | if (cfg->fc_flags & RTF_EXPIRES) | |
1305 | rt6_set_expires(rt, jiffies + | |
1306 | clock_t_to_jiffies(cfg->fc_expires)); | |
1307 | else | |
1308 | rt6_clean_expires(rt); | |
1da177e4 | 1309 | |
86872cb5 TG |
1310 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1311 | cfg->fc_protocol = RTPROT_BOOT; | |
1312 | rt->rt6i_protocol = cfg->fc_protocol; | |
1313 | ||
1314 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1315 | |
1316 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1317 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1318 | else if (cfg->fc_flags & RTF_LOCAL) |
1319 | rt->dst.input = ip6_input; | |
1da177e4 | 1320 | else |
d8d1f30b | 1321 | rt->dst.input = ip6_forward; |
1da177e4 | 1322 | |
d8d1f30b | 1323 | rt->dst.output = ip6_output; |
1da177e4 | 1324 | |
86872cb5 TG |
1325 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1326 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1327 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1328 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1329 | |
8e2ec639 YZ |
1330 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1331 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1332 | if (!metrics) { | |
1333 | err = -ENOMEM; | |
1334 | goto out; | |
1335 | } | |
1336 | dst_init_metrics(&rt->dst, metrics, 0); | |
1337 | } | |
1da177e4 | 1338 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1339 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1340 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1341 | #endif |
1342 | ||
86872cb5 | 1343 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1344 | |
1345 | /* We cannot add true routes via loopback here, | |
1346 | they would result in kernel looping; promote them to reject routes | |
1347 | */ | |
86872cb5 | 1348 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1349 | (dev && (dev->flags & IFF_LOOPBACK) && |
1350 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1351 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1352 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1353 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1354 | if (dev) { |
1355 | dev_put(dev); | |
1356 | in6_dev_put(idev); | |
1357 | } | |
5578689a | 1358 | dev = net->loopback_dev; |
1da177e4 LT |
1359 | dev_hold(dev); |
1360 | idev = in6_dev_get(dev); | |
1361 | if (!idev) { | |
1362 | err = -ENODEV; | |
1363 | goto out; | |
1364 | } | |
1365 | } | |
d8d1f30b CG |
1366 | rt->dst.output = ip6_pkt_discard_out; |
1367 | rt->dst.input = ip6_pkt_discard; | |
1368 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1369 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1370 | goto install_route; | |
1371 | } | |
1372 | ||
86872cb5 | 1373 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1374 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1375 | int gwa_type; |
1376 | ||
86872cb5 | 1377 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1378 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1379 | gwa_type = ipv6_addr_type(gw_addr); |
1380 | ||
1381 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1382 | struct rt6_info *grt; | |
1383 | ||
1384 | /* IPv6 strictly inhibits using not link-local | |
1385 | addresses as nexthop address. | |
1386 | Otherwise, router will not able to send redirects. | |
1387 | It is very good, but in some (rare!) circumstances | |
1388 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1389 | some exceptions. --ANK | |
1390 | */ | |
1391 | err = -EINVAL; | |
38308473 | 1392 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1393 | goto out; |
1394 | ||
5578689a | 1395 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1396 | |
1397 | err = -EHOSTUNREACH; | |
38308473 | 1398 | if (!grt) |
1da177e4 LT |
1399 | goto out; |
1400 | if (dev) { | |
d1918542 | 1401 | if (dev != grt->dst.dev) { |
d8d1f30b | 1402 | dst_release(&grt->dst); |
1da177e4 LT |
1403 | goto out; |
1404 | } | |
1405 | } else { | |
d1918542 | 1406 | dev = grt->dst.dev; |
1da177e4 LT |
1407 | idev = grt->rt6i_idev; |
1408 | dev_hold(dev); | |
1409 | in6_dev_hold(grt->rt6i_idev); | |
1410 | } | |
38308473 | 1411 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1412 | err = 0; |
d8d1f30b | 1413 | dst_release(&grt->dst); |
1da177e4 LT |
1414 | |
1415 | if (err) | |
1416 | goto out; | |
1417 | } | |
1418 | err = -EINVAL; | |
38308473 | 1419 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1420 | goto out; |
1421 | } | |
1422 | ||
1423 | err = -ENODEV; | |
38308473 | 1424 | if (!dev) |
1da177e4 LT |
1425 | goto out; |
1426 | ||
c3968a85 DW |
1427 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1428 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1429 | err = -EINVAL; | |
1430 | goto out; | |
1431 | } | |
4e3fd7a0 | 1432 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1433 | rt->rt6i_prefsrc.plen = 128; |
1434 | } else | |
1435 | rt->rt6i_prefsrc.plen = 0; | |
1436 | ||
86872cb5 | 1437 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
8ade06c6 | 1438 | err = rt6_bind_neighbour(rt, dev); |
f83c7790 | 1439 | if (err) |
1da177e4 | 1440 | goto out; |
1da177e4 LT |
1441 | } |
1442 | ||
86872cb5 | 1443 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1444 | |
1445 | install_route: | |
86872cb5 TG |
1446 | if (cfg->fc_mx) { |
1447 | struct nlattr *nla; | |
1448 | int remaining; | |
1449 | ||
1450 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1451 | int type = nla_type(nla); |
86872cb5 TG |
1452 | |
1453 | if (type) { | |
1454 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1455 | err = -EINVAL; |
1456 | goto out; | |
1457 | } | |
86872cb5 | 1458 | |
defb3519 | 1459 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1460 | } |
1da177e4 LT |
1461 | } |
1462 | } | |
1463 | ||
d8d1f30b | 1464 | rt->dst.dev = dev; |
1da177e4 | 1465 | rt->rt6i_idev = idev; |
c71099ac | 1466 | rt->rt6i_table = table; |
63152fc0 | 1467 | |
c346dca1 | 1468 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1469 | |
86872cb5 | 1470 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1471 | |
1472 | out: | |
1473 | if (dev) | |
1474 | dev_put(dev); | |
1475 | if (idev) | |
1476 | in6_dev_put(idev); | |
1477 | if (rt) | |
d8d1f30b | 1478 | dst_free(&rt->dst); |
1da177e4 LT |
1479 | return err; |
1480 | } | |
1481 | ||
86872cb5 | 1482 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1483 | { |
1484 | int err; | |
c71099ac | 1485 | struct fib6_table *table; |
d1918542 | 1486 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1487 | |
8ed67789 | 1488 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1489 | return -ENOENT; |
1490 | ||
c71099ac TG |
1491 | table = rt->rt6i_table; |
1492 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1493 | |
86872cb5 | 1494 | err = fib6_del(rt, info); |
d8d1f30b | 1495 | dst_release(&rt->dst); |
1da177e4 | 1496 | |
c71099ac | 1497 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1498 | |
1499 | return err; | |
1500 | } | |
1501 | ||
e0a1ad73 TG |
1502 | int ip6_del_rt(struct rt6_info *rt) |
1503 | { | |
4d1169c1 | 1504 | struct nl_info info = { |
d1918542 | 1505 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1506 | }; |
528c4ceb | 1507 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1508 | } |
1509 | ||
86872cb5 | 1510 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1511 | { |
c71099ac | 1512 | struct fib6_table *table; |
1da177e4 LT |
1513 | struct fib6_node *fn; |
1514 | struct rt6_info *rt; | |
1515 | int err = -ESRCH; | |
1516 | ||
5578689a | 1517 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1518 | if (!table) |
c71099ac TG |
1519 | return err; |
1520 | ||
1521 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1522 | |
c71099ac | 1523 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1524 | &cfg->fc_dst, cfg->fc_dst_len, |
1525 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1526 | |
1da177e4 | 1527 | if (fn) { |
d8d1f30b | 1528 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1529 | if (cfg->fc_ifindex && |
d1918542 DM |
1530 | (!rt->dst.dev || |
1531 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1532 | continue; |
86872cb5 TG |
1533 | if (cfg->fc_flags & RTF_GATEWAY && |
1534 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1535 | continue; |
86872cb5 | 1536 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1537 | continue; |
d8d1f30b | 1538 | dst_hold(&rt->dst); |
c71099ac | 1539 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1540 | |
86872cb5 | 1541 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1542 | } |
1543 | } | |
c71099ac | 1544 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1545 | |
1546 | return err; | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * Handle redirects | |
1551 | */ | |
a6279458 | 1552 | struct ip6rd_flowi { |
4c9483b2 | 1553 | struct flowi6 fl6; |
a6279458 YH |
1554 | struct in6_addr gateway; |
1555 | }; | |
1556 | ||
8ed67789 DL |
1557 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1558 | struct fib6_table *table, | |
4c9483b2 | 1559 | struct flowi6 *fl6, |
a6279458 | 1560 | int flags) |
1da177e4 | 1561 | { |
4c9483b2 | 1562 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
a6279458 | 1563 | struct rt6_info *rt; |
e843b9e1 | 1564 | struct fib6_node *fn; |
c71099ac | 1565 | |
1da177e4 | 1566 | /* |
e843b9e1 YH |
1567 | * Get the "current" route for this destination and |
1568 | * check if the redirect has come from approriate router. | |
1569 | * | |
1570 | * RFC 2461 specifies that redirects should only be | |
1571 | * accepted if they come from the nexthop to the target. | |
1572 | * Due to the way the routes are chosen, this notion | |
1573 | * is a bit fuzzy and one might need to check all possible | |
1574 | * routes. | |
1da177e4 | 1575 | */ |
1da177e4 | 1576 | |
c71099ac | 1577 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 1578 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
e843b9e1 | 1579 | restart: |
d8d1f30b | 1580 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1581 | /* |
1582 | * Current route is on-link; redirect is always invalid. | |
1583 | * | |
1584 | * Seems, previous statement is not true. It could | |
1585 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1586 | * But then router serving it might decide, that we should | |
1587 | * know truth 8)8) --ANK (980726). | |
1588 | */ | |
1589 | if (rt6_check_expired(rt)) | |
1590 | continue; | |
1591 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1592 | continue; | |
d1918542 | 1593 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) |
e843b9e1 | 1594 | continue; |
a6279458 | 1595 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1596 | continue; |
1597 | break; | |
1598 | } | |
a6279458 | 1599 | |
cb15d9c2 | 1600 | if (!rt) |
8ed67789 | 1601 | rt = net->ipv6.ip6_null_entry; |
4c9483b2 | 1602 | BACKTRACK(net, &fl6->saddr); |
cb15d9c2 | 1603 | out: |
d8d1f30b | 1604 | dst_hold(&rt->dst); |
a6279458 | 1605 | |
c71099ac | 1606 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1607 | |
a6279458 YH |
1608 | return rt; |
1609 | }; | |
1610 | ||
b71d1d42 ED |
1611 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
1612 | const struct in6_addr *src, | |
1613 | const struct in6_addr *gateway, | |
a6279458 YH |
1614 | struct net_device *dev) |
1615 | { | |
adaa70bb | 1616 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1617 | struct net *net = dev_net(dev); |
a6279458 | 1618 | struct ip6rd_flowi rdfl = { |
4c9483b2 DM |
1619 | .fl6 = { |
1620 | .flowi6_oif = dev->ifindex, | |
1621 | .daddr = *dest, | |
1622 | .saddr = *src, | |
a6279458 | 1623 | }, |
a6279458 | 1624 | }; |
adaa70bb | 1625 | |
4e3fd7a0 | 1626 | rdfl.gateway = *gateway; |
86c36ce4 | 1627 | |
adaa70bb TG |
1628 | if (rt6_need_strict(dest)) |
1629 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1630 | |
4c9483b2 | 1631 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
58f09b78 | 1632 | flags, __ip6_route_redirect); |
a6279458 YH |
1633 | } |
1634 | ||
b71d1d42 ED |
1635 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
1636 | const struct in6_addr *saddr, | |
a6279458 YH |
1637 | struct neighbour *neigh, u8 *lladdr, int on_link) |
1638 | { | |
1639 | struct rt6_info *rt, *nrt = NULL; | |
1640 | struct netevent_redirect netevent; | |
c346dca1 | 1641 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1642 | |
1643 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1644 | ||
8ed67789 | 1645 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1646 | if (net_ratelimit()) |
1647 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1648 | "for redirect target\n"); | |
a6279458 | 1649 | goto out; |
1da177e4 LT |
1650 | } |
1651 | ||
1da177e4 LT |
1652 | /* |
1653 | * We have finally decided to accept it. | |
1654 | */ | |
1655 | ||
1ab1457c | 1656 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1657 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1658 | NEIGH_UPDATE_F_OVERRIDE| | |
1659 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1660 | NEIGH_UPDATE_F_ISROUTER)) | |
1661 | ); | |
1662 | ||
1663 | /* | |
1664 | * Redirect received -> path was valid. | |
1665 | * Look, redirects are sent only in response to data packets, | |
1666 | * so that this nexthop apparently is reachable. --ANK | |
1667 | */ | |
d8d1f30b | 1668 | dst_confirm(&rt->dst); |
1da177e4 LT |
1669 | |
1670 | /* Duplicate redirect: silently ignore. */ | |
27217455 | 1671 | if (neigh == dst_get_neighbour_noref_raw(&rt->dst)) |
1da177e4 LT |
1672 | goto out; |
1673 | ||
21efcfa0 | 1674 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1675 | if (!nrt) |
1da177e4 LT |
1676 | goto out; |
1677 | ||
1678 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1679 | if (on_link) | |
1680 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1681 | ||
4e3fd7a0 | 1682 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
69cce1d1 | 1683 | dst_set_neighbour(&nrt->dst, neigh_clone(neigh)); |
1da177e4 | 1684 | |
40e22e8f | 1685 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1686 | goto out; |
1687 | ||
d8d1f30b CG |
1688 | netevent.old = &rt->dst; |
1689 | netevent.new = &nrt->dst; | |
8d71740c TT |
1690 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1691 | ||
38308473 | 1692 | if (rt->rt6i_flags & RTF_CACHE) { |
e0a1ad73 | 1693 | ip6_del_rt(rt); |
1da177e4 LT |
1694 | return; |
1695 | } | |
1696 | ||
1697 | out: | |
d8d1f30b | 1698 | dst_release(&rt->dst); |
1da177e4 LT |
1699 | } |
1700 | ||
1701 | /* | |
1702 | * Handle ICMP "packet too big" messages | |
1703 | * i.e. Path MTU discovery | |
1704 | */ | |
1705 | ||
b71d1d42 | 1706 | static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 | 1707 | struct net *net, u32 pmtu, int ifindex) |
1da177e4 LT |
1708 | { |
1709 | struct rt6_info *rt, *nrt; | |
1710 | int allfrag = 0; | |
d3052b55 | 1711 | again: |
ae878ae2 | 1712 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
38308473 | 1713 | if (!rt) |
1da177e4 LT |
1714 | return; |
1715 | ||
d3052b55 AV |
1716 | if (rt6_check_expired(rt)) { |
1717 | ip6_del_rt(rt); | |
1718 | goto again; | |
1719 | } | |
1720 | ||
d8d1f30b | 1721 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1722 | goto out; |
1723 | ||
1724 | if (pmtu < IPV6_MIN_MTU) { | |
1725 | /* | |
1ab1457c | 1726 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1727 | * MTU (1280) and a fragment header should always be included |
1728 | * after a node receiving Too Big message reporting PMTU is | |
1729 | * less than the IPv6 Minimum Link MTU. | |
1730 | */ | |
1731 | pmtu = IPV6_MIN_MTU; | |
1732 | allfrag = 1; | |
1733 | } | |
1734 | ||
1735 | /* New mtu received -> path was valid. | |
1736 | They are sent only in response to data packets, | |
1737 | so that this nexthop apparently is reachable. --ANK | |
1738 | */ | |
d8d1f30b | 1739 | dst_confirm(&rt->dst); |
1da177e4 LT |
1740 | |
1741 | /* Host route. If it is static, it would be better | |
1742 | not to override it, but add new one, so that | |
1743 | when cache entry will expire old pmtu | |
1744 | would return automatically. | |
1745 | */ | |
1746 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1747 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1748 | if (allfrag) { | |
1749 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1750 | features |= RTAX_FEATURE_ALLFRAG; | |
1751 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1752 | } | |
1716a961 G |
1753 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1754 | rt->rt6i_flags |= RTF_MODIFIED; | |
1da177e4 LT |
1755 | goto out; |
1756 | } | |
1757 | ||
1758 | /* Network route. | |
1759 | Two cases are possible: | |
1760 | 1. It is connected route. Action: COW | |
1761 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1762 | */ | |
27217455 | 1763 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1764 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1765 | else |
1766 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1767 | |
d5315b50 | 1768 | if (nrt) { |
defb3519 DM |
1769 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1770 | if (allfrag) { | |
1771 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1772 | features |= RTAX_FEATURE_ALLFRAG; | |
1773 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1774 | } | |
a1e78363 YH |
1775 | |
1776 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1777 | * happened within 5 mins, the recommended timer is 10 mins. | |
1778 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1779 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1780 | * and detecting PMTU increase will be automatically happened. | |
1781 | */ | |
1716a961 G |
1782 | rt6_update_expires(nrt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1783 | nrt->rt6i_flags |= RTF_DYNAMIC; | |
40e22e8f | 1784 | ip6_ins_rt(nrt); |
1da177e4 | 1785 | } |
1da177e4 | 1786 | out: |
d8d1f30b | 1787 | dst_release(&rt->dst); |
1da177e4 LT |
1788 | } |
1789 | ||
b71d1d42 | 1790 | void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 MŻ |
1791 | struct net_device *dev, u32 pmtu) |
1792 | { | |
1793 | struct net *net = dev_net(dev); | |
1794 | ||
1795 | /* | |
1796 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1797 | * is sending along the path" that caused the Packet Too Big message. | |
1798 | * Since it's not possible in the general case to determine which | |
1799 | * interface was used to send the original packet, we update the MTU | |
1800 | * on the interface that will be used to send future packets. We also | |
1801 | * update the MTU on the interface that received the Packet Too Big in | |
1802 | * case the original packet was forced out that interface with | |
1803 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1804 | * correct behaviour, which would be to update the MTU on all | |
1805 | * interfaces. | |
1806 | */ | |
1807 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1808 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1809 | } | |
1810 | ||
1da177e4 LT |
1811 | /* |
1812 | * Misc support functions | |
1813 | */ | |
1814 | ||
1716a961 | 1815 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1816 | const struct in6_addr *dest) |
1da177e4 | 1817 | { |
d1918542 | 1818 | struct net *net = dev_net(ort->dst.dev); |
5c1e6aa3 | 1819 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 1820 | ort->dst.dev, 0); |
1da177e4 LT |
1821 | |
1822 | if (rt) { | |
d8d1f30b CG |
1823 | rt->dst.input = ort->dst.input; |
1824 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1825 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1826 | |
4e3fd7a0 | 1827 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1828 | rt->rt6i_dst.plen = 128; |
defb3519 | 1829 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1830 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1831 | rt->rt6i_idev = ort->rt6i_idev; |
1832 | if (rt->rt6i_idev) | |
1833 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1834 | rt->dst.lastuse = jiffies; |
1da177e4 | 1835 | |
4e3fd7a0 | 1836 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1837 | rt->rt6i_flags = ort->rt6i_flags; |
1838 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1839 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1840 | rt6_set_from(rt, ort); | |
1841 | else | |
1842 | rt6_clean_expires(rt); | |
1da177e4 LT |
1843 | rt->rt6i_metric = 0; |
1844 | ||
1da177e4 LT |
1845 | #ifdef CONFIG_IPV6_SUBTREES |
1846 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1847 | #endif | |
0f6c6392 | 1848 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1849 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1850 | } |
1851 | return rt; | |
1852 | } | |
1853 | ||
70ceb4f5 | 1854 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1855 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1856 | const struct in6_addr *prefix, int prefixlen, |
1857 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1858 | { |
1859 | struct fib6_node *fn; | |
1860 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1861 | struct fib6_table *table; |
1862 | ||
efa2cea0 | 1863 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1864 | if (!table) |
c71099ac | 1865 | return NULL; |
70ceb4f5 | 1866 | |
c71099ac TG |
1867 | write_lock_bh(&table->tb6_lock); |
1868 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1869 | if (!fn) |
1870 | goto out; | |
1871 | ||
d8d1f30b | 1872 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1873 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1874 | continue; |
1875 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1876 | continue; | |
1877 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1878 | continue; | |
d8d1f30b | 1879 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1880 | break; |
1881 | } | |
1882 | out: | |
c71099ac | 1883 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1884 | return rt; |
1885 | } | |
1886 | ||
efa2cea0 | 1887 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1888 | const struct in6_addr *prefix, int prefixlen, |
1889 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1890 | unsigned int pref) |
70ceb4f5 | 1891 | { |
86872cb5 TG |
1892 | struct fib6_config cfg = { |
1893 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1894 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1895 | .fc_ifindex = ifindex, |
1896 | .fc_dst_len = prefixlen, | |
1897 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1898 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1899 | .fc_nlinfo.pid = 0, |
1900 | .fc_nlinfo.nlh = NULL, | |
1901 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1902 | }; |
1903 | ||
4e3fd7a0 AD |
1904 | cfg.fc_dst = *prefix; |
1905 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1906 | |
e317da96 YH |
1907 | /* We should treat it as a default route if prefix length is 0. */ |
1908 | if (!prefixlen) | |
86872cb5 | 1909 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1910 | |
86872cb5 | 1911 | ip6_route_add(&cfg); |
70ceb4f5 | 1912 | |
efa2cea0 | 1913 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1914 | } |
1915 | #endif | |
1916 | ||
b71d1d42 | 1917 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1918 | { |
1da177e4 | 1919 | struct rt6_info *rt; |
c71099ac | 1920 | struct fib6_table *table; |
1da177e4 | 1921 | |
c346dca1 | 1922 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1923 | if (!table) |
c71099ac | 1924 | return NULL; |
1da177e4 | 1925 | |
c71099ac | 1926 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1927 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1928 | if (dev == rt->dst.dev && |
045927ff | 1929 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1930 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1931 | break; | |
1932 | } | |
1933 | if (rt) | |
d8d1f30b | 1934 | dst_hold(&rt->dst); |
c71099ac | 1935 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1936 | return rt; |
1937 | } | |
1938 | ||
b71d1d42 | 1939 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1940 | struct net_device *dev, |
1941 | unsigned int pref) | |
1da177e4 | 1942 | { |
86872cb5 TG |
1943 | struct fib6_config cfg = { |
1944 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1945 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1946 | .fc_ifindex = dev->ifindex, |
1947 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1948 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1949 | .fc_nlinfo.pid = 0, |
1950 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1951 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1952 | }; |
1da177e4 | 1953 | |
4e3fd7a0 | 1954 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1955 | |
86872cb5 | 1956 | ip6_route_add(&cfg); |
1da177e4 | 1957 | |
1da177e4 LT |
1958 | return rt6_get_dflt_router(gwaddr, dev); |
1959 | } | |
1960 | ||
7b4da532 | 1961 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1962 | { |
1963 | struct rt6_info *rt; | |
c71099ac TG |
1964 | struct fib6_table *table; |
1965 | ||
1966 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1967 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1968 | if (!table) |
c71099ac | 1969 | return; |
1da177e4 LT |
1970 | |
1971 | restart: | |
c71099ac | 1972 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1973 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1974 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1975 | dst_hold(&rt->dst); |
c71099ac | 1976 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1977 | ip6_del_rt(rt); |
1da177e4 LT |
1978 | goto restart; |
1979 | } | |
1980 | } | |
c71099ac | 1981 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1982 | } |
1983 | ||
5578689a DL |
1984 | static void rtmsg_to_fib6_config(struct net *net, |
1985 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1986 | struct fib6_config *cfg) |
1987 | { | |
1988 | memset(cfg, 0, sizeof(*cfg)); | |
1989 | ||
1990 | cfg->fc_table = RT6_TABLE_MAIN; | |
1991 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1992 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1993 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1994 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1995 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1996 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1997 | ||
5578689a | 1998 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1999 | |
4e3fd7a0 AD |
2000 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2001 | cfg->fc_src = rtmsg->rtmsg_src; | |
2002 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2003 | } |
2004 | ||
5578689a | 2005 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2006 | { |
86872cb5 | 2007 | struct fib6_config cfg; |
1da177e4 LT |
2008 | struct in6_rtmsg rtmsg; |
2009 | int err; | |
2010 | ||
2011 | switch(cmd) { | |
2012 | case SIOCADDRT: /* Add a route */ | |
2013 | case SIOCDELRT: /* Delete a route */ | |
2014 | if (!capable(CAP_NET_ADMIN)) | |
2015 | return -EPERM; | |
2016 | err = copy_from_user(&rtmsg, arg, | |
2017 | sizeof(struct in6_rtmsg)); | |
2018 | if (err) | |
2019 | return -EFAULT; | |
86872cb5 | 2020 | |
5578689a | 2021 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2022 | |
1da177e4 LT |
2023 | rtnl_lock(); |
2024 | switch (cmd) { | |
2025 | case SIOCADDRT: | |
86872cb5 | 2026 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2027 | break; |
2028 | case SIOCDELRT: | |
86872cb5 | 2029 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2030 | break; |
2031 | default: | |
2032 | err = -EINVAL; | |
2033 | } | |
2034 | rtnl_unlock(); | |
2035 | ||
2036 | return err; | |
3ff50b79 | 2037 | } |
1da177e4 LT |
2038 | |
2039 | return -EINVAL; | |
2040 | } | |
2041 | ||
2042 | /* | |
2043 | * Drop the packet on the floor | |
2044 | */ | |
2045 | ||
d5fdd6ba | 2046 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2047 | { |
612f09e8 | 2048 | int type; |
adf30907 | 2049 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2050 | switch (ipstats_mib_noroutes) { |
2051 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2052 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2053 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2054 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2055 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2056 | break; |
2057 | } | |
2058 | /* FALLTHROUGH */ | |
2059 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2060 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2061 | ipstats_mib_noroutes); | |
612f09e8 YH |
2062 | break; |
2063 | } | |
3ffe533c | 2064 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2065 | kfree_skb(skb); |
2066 | return 0; | |
2067 | } | |
2068 | ||
9ce8ade0 TG |
2069 | static int ip6_pkt_discard(struct sk_buff *skb) |
2070 | { | |
612f09e8 | 2071 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2072 | } |
2073 | ||
20380731 | 2074 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2075 | { |
adf30907 | 2076 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2077 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2078 | } |
2079 | ||
6723ab54 DM |
2080 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2081 | ||
9ce8ade0 TG |
2082 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2083 | { | |
612f09e8 | 2084 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2085 | } |
2086 | ||
2087 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2088 | { | |
adf30907 | 2089 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2090 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2091 | } |
2092 | ||
6723ab54 DM |
2093 | #endif |
2094 | ||
1da177e4 LT |
2095 | /* |
2096 | * Allocate a dst for local (unicast / anycast) address. | |
2097 | */ | |
2098 | ||
2099 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2100 | const struct in6_addr *addr, | |
8f031519 | 2101 | bool anycast) |
1da177e4 | 2102 | { |
c346dca1 | 2103 | struct net *net = dev_net(idev->dev); |
5c1e6aa3 | 2104 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 2105 | net->loopback_dev, 0); |
f83c7790 | 2106 | int err; |
1da177e4 | 2107 | |
38308473 | 2108 | if (!rt) { |
40385653 BG |
2109 | if (net_ratelimit()) |
2110 | pr_warning("IPv6: Maximum number of routes reached," | |
2111 | " consider increasing route/max_size.\n"); | |
1da177e4 | 2112 | return ERR_PTR(-ENOMEM); |
40385653 | 2113 | } |
1da177e4 | 2114 | |
1da177e4 LT |
2115 | in6_dev_hold(idev); |
2116 | ||
11d53b49 | 2117 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2118 | rt->dst.input = ip6_input; |
2119 | rt->dst.output = ip6_output; | |
1da177e4 | 2120 | rt->rt6i_idev = idev; |
d8d1f30b | 2121 | rt->dst.obsolete = -1; |
1da177e4 LT |
2122 | |
2123 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2124 | if (anycast) |
2125 | rt->rt6i_flags |= RTF_ANYCAST; | |
2126 | else | |
1da177e4 | 2127 | rt->rt6i_flags |= RTF_LOCAL; |
8ade06c6 | 2128 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
f83c7790 | 2129 | if (err) { |
d8d1f30b | 2130 | dst_free(&rt->dst); |
f83c7790 | 2131 | return ERR_PTR(err); |
1da177e4 LT |
2132 | } |
2133 | ||
4e3fd7a0 | 2134 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2135 | rt->rt6i_dst.plen = 128; |
5578689a | 2136 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2137 | |
d8d1f30b | 2138 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2139 | |
2140 | return rt; | |
2141 | } | |
2142 | ||
c3968a85 DW |
2143 | int ip6_route_get_saddr(struct net *net, |
2144 | struct rt6_info *rt, | |
b71d1d42 | 2145 | const struct in6_addr *daddr, |
c3968a85 DW |
2146 | unsigned int prefs, |
2147 | struct in6_addr *saddr) | |
2148 | { | |
2149 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2150 | int err = 0; | |
2151 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2152 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2153 | else |
2154 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2155 | daddr, prefs, saddr); | |
2156 | return err; | |
2157 | } | |
2158 | ||
2159 | /* remove deleted ip from prefsrc entries */ | |
2160 | struct arg_dev_net_ip { | |
2161 | struct net_device *dev; | |
2162 | struct net *net; | |
2163 | struct in6_addr *addr; | |
2164 | }; | |
2165 | ||
2166 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2167 | { | |
2168 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2169 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2170 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2171 | ||
d1918542 | 2172 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2173 | rt != net->ipv6.ip6_null_entry && |
2174 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2175 | /* remove prefsrc entry */ | |
2176 | rt->rt6i_prefsrc.plen = 0; | |
2177 | } | |
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2182 | { | |
2183 | struct net *net = dev_net(ifp->idev->dev); | |
2184 | struct arg_dev_net_ip adni = { | |
2185 | .dev = ifp->idev->dev, | |
2186 | .net = net, | |
2187 | .addr = &ifp->addr, | |
2188 | }; | |
2189 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2190 | } | |
2191 | ||
8ed67789 DL |
2192 | struct arg_dev_net { |
2193 | struct net_device *dev; | |
2194 | struct net *net; | |
2195 | }; | |
2196 | ||
1da177e4 LT |
2197 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2198 | { | |
bc3ef660 | 2199 | const struct arg_dev_net *adn = arg; |
2200 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2201 | |
d1918542 | 2202 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2203 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2204 | return -1; |
c159d30c | 2205 | |
1da177e4 LT |
2206 | return 0; |
2207 | } | |
2208 | ||
f3db4851 | 2209 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2210 | { |
8ed67789 DL |
2211 | struct arg_dev_net adn = { |
2212 | .dev = dev, | |
2213 | .net = net, | |
2214 | }; | |
2215 | ||
2216 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2217 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2218 | } |
2219 | ||
95c96174 | 2220 | struct rt6_mtu_change_arg { |
1da177e4 | 2221 | struct net_device *dev; |
95c96174 | 2222 | unsigned int mtu; |
1da177e4 LT |
2223 | }; |
2224 | ||
2225 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2226 | { | |
2227 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2228 | struct inet6_dev *idev; | |
2229 | ||
2230 | /* In IPv6 pmtu discovery is not optional, | |
2231 | so that RTAX_MTU lock cannot disable it. | |
2232 | We still use this lock to block changes | |
2233 | caused by addrconf/ndisc. | |
2234 | */ | |
2235 | ||
2236 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2237 | if (!idev) |
1da177e4 LT |
2238 | return 0; |
2239 | ||
2240 | /* For administrative MTU increase, there is no way to discover | |
2241 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2242 | Since RFC 1981 doesn't include administrative MTU increase | |
2243 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2244 | */ | |
2245 | /* | |
2246 | If new MTU is less than route PMTU, this new MTU will be the | |
2247 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2248 | decreases; if new MTU is greater than route PMTU, and the | |
2249 | old MTU is the lowest MTU in the path, update the route PMTU | |
2250 | to reflect the increase. In this case if the other nodes' MTU | |
2251 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2252 | PMTU discouvery. | |
2253 | */ | |
d1918542 | 2254 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2255 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2256 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2257 | (dst_mtu(&rt->dst) < arg->mtu && | |
2258 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2259 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2260 | } |
1da177e4 LT |
2261 | return 0; |
2262 | } | |
2263 | ||
95c96174 | 2264 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2265 | { |
c71099ac TG |
2266 | struct rt6_mtu_change_arg arg = { |
2267 | .dev = dev, | |
2268 | .mtu = mtu, | |
2269 | }; | |
1da177e4 | 2270 | |
c346dca1 | 2271 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2272 | } |
2273 | ||
ef7c79ed | 2274 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2275 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2276 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2277 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2278 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2279 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2280 | }; | |
2281 | ||
2282 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2283 | struct fib6_config *cfg) | |
1da177e4 | 2284 | { |
86872cb5 TG |
2285 | struct rtmsg *rtm; |
2286 | struct nlattr *tb[RTA_MAX+1]; | |
2287 | int err; | |
1da177e4 | 2288 | |
86872cb5 TG |
2289 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2290 | if (err < 0) | |
2291 | goto errout; | |
1da177e4 | 2292 | |
86872cb5 TG |
2293 | err = -EINVAL; |
2294 | rtm = nlmsg_data(nlh); | |
2295 | memset(cfg, 0, sizeof(*cfg)); | |
2296 | ||
2297 | cfg->fc_table = rtm->rtm_table; | |
2298 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2299 | cfg->fc_src_len = rtm->rtm_src_len; | |
2300 | cfg->fc_flags = RTF_UP; | |
2301 | cfg->fc_protocol = rtm->rtm_protocol; | |
2302 | ||
2303 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2304 | cfg->fc_flags |= RTF_REJECT; | |
2305 | ||
ab79ad14 MŻ |
2306 | if (rtm->rtm_type == RTN_LOCAL) |
2307 | cfg->fc_flags |= RTF_LOCAL; | |
2308 | ||
86872cb5 TG |
2309 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2310 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2311 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2312 | |
2313 | if (tb[RTA_GATEWAY]) { | |
2314 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2315 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2316 | } |
86872cb5 TG |
2317 | |
2318 | if (tb[RTA_DST]) { | |
2319 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2320 | ||
2321 | if (nla_len(tb[RTA_DST]) < plen) | |
2322 | goto errout; | |
2323 | ||
2324 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2325 | } |
86872cb5 TG |
2326 | |
2327 | if (tb[RTA_SRC]) { | |
2328 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2329 | ||
2330 | if (nla_len(tb[RTA_SRC]) < plen) | |
2331 | goto errout; | |
2332 | ||
2333 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2334 | } |
86872cb5 | 2335 | |
c3968a85 DW |
2336 | if (tb[RTA_PREFSRC]) |
2337 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2338 | ||
86872cb5 TG |
2339 | if (tb[RTA_OIF]) |
2340 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2341 | ||
2342 | if (tb[RTA_PRIORITY]) | |
2343 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2344 | ||
2345 | if (tb[RTA_METRICS]) { | |
2346 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2347 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2348 | } |
86872cb5 TG |
2349 | |
2350 | if (tb[RTA_TABLE]) | |
2351 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2352 | ||
2353 | err = 0; | |
2354 | errout: | |
2355 | return err; | |
1da177e4 LT |
2356 | } |
2357 | ||
c127ea2c | 2358 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2359 | { |
86872cb5 TG |
2360 | struct fib6_config cfg; |
2361 | int err; | |
1da177e4 | 2362 | |
86872cb5 TG |
2363 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2364 | if (err < 0) | |
2365 | return err; | |
2366 | ||
2367 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2368 | } |
2369 | ||
c127ea2c | 2370 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2371 | { |
86872cb5 TG |
2372 | struct fib6_config cfg; |
2373 | int err; | |
1da177e4 | 2374 | |
86872cb5 TG |
2375 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2376 | if (err < 0) | |
2377 | return err; | |
2378 | ||
2379 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2380 | } |
2381 | ||
339bf98f TG |
2382 | static inline size_t rt6_nlmsg_size(void) |
2383 | { | |
2384 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2385 | + nla_total_size(16) /* RTA_SRC */ | |
2386 | + nla_total_size(16) /* RTA_DST */ | |
2387 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2388 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2389 | + nla_total_size(4) /* RTA_TABLE */ | |
2390 | + nla_total_size(4) /* RTA_IIF */ | |
2391 | + nla_total_size(4) /* RTA_OIF */ | |
2392 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2393 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2394 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2395 | } | |
2396 | ||
191cd582 BH |
2397 | static int rt6_fill_node(struct net *net, |
2398 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2399 | struct in6_addr *dst, struct in6_addr *src, |
2400 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2401 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 2402 | { |
346f870b | 2403 | const struct inet_peer *peer; |
1da177e4 | 2404 | struct rtmsg *rtm; |
2d7202bf | 2405 | struct nlmsghdr *nlh; |
e3703b3d | 2406 | long expires; |
9e762a4a | 2407 | u32 table; |
f2c31e32 | 2408 | struct neighbour *n; |
346f870b | 2409 | u32 ts, tsage; |
1da177e4 LT |
2410 | |
2411 | if (prefix) { /* user wants prefix routes only */ | |
2412 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2413 | /* success since this is not a prefix route */ | |
2414 | return 1; | |
2415 | } | |
2416 | } | |
2417 | ||
2d7202bf | 2418 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
38308473 | 2419 | if (!nlh) |
26932566 | 2420 | return -EMSGSIZE; |
2d7202bf TG |
2421 | |
2422 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2423 | rtm->rtm_family = AF_INET6; |
2424 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2425 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2426 | rtm->rtm_tos = 0; | |
c71099ac | 2427 | if (rt->rt6i_table) |
9e762a4a | 2428 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2429 | else |
9e762a4a PM |
2430 | table = RT6_TABLE_UNSPEC; |
2431 | rtm->rtm_table = table; | |
c78679e8 DM |
2432 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2433 | goto nla_put_failure; | |
38308473 | 2434 | if (rt->rt6i_flags & RTF_REJECT) |
1da177e4 | 2435 | rtm->rtm_type = RTN_UNREACHABLE; |
38308473 | 2436 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2437 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2438 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2439 | rtm->rtm_type = RTN_LOCAL; |
2440 | else | |
2441 | rtm->rtm_type = RTN_UNICAST; | |
2442 | rtm->rtm_flags = 0; | |
2443 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2444 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2445 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 LT |
2446 | rtm->rtm_protocol = RTPROT_REDIRECT; |
2447 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2448 | rtm->rtm_protocol = RTPROT_KERNEL; | |
38308473 | 2449 | else if (rt->rt6i_flags & RTF_DEFAULT) |
1da177e4 LT |
2450 | rtm->rtm_protocol = RTPROT_RA; |
2451 | ||
38308473 | 2452 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2453 | rtm->rtm_flags |= RTM_F_CLONED; |
2454 | ||
2455 | if (dst) { | |
c78679e8 DM |
2456 | if (nla_put(skb, RTA_DST, 16, dst)) |
2457 | goto nla_put_failure; | |
1ab1457c | 2458 | rtm->rtm_dst_len = 128; |
1da177e4 | 2459 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2460 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2461 | goto nla_put_failure; | |
1da177e4 LT |
2462 | #ifdef CONFIG_IPV6_SUBTREES |
2463 | if (src) { | |
c78679e8 DM |
2464 | if (nla_put(skb, RTA_SRC, 16, src)) |
2465 | goto nla_put_failure; | |
1ab1457c | 2466 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2467 | } else if (rtm->rtm_src_len && |
2468 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2469 | goto nla_put_failure; | |
1da177e4 | 2470 | #endif |
7bc570c8 YH |
2471 | if (iif) { |
2472 | #ifdef CONFIG_IPV6_MROUTE | |
2473 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2474 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2475 | if (err <= 0) { |
2476 | if (!nowait) { | |
2477 | if (err == 0) | |
2478 | return 0; | |
2479 | goto nla_put_failure; | |
2480 | } else { | |
2481 | if (err == -EMSGSIZE) | |
2482 | goto nla_put_failure; | |
2483 | } | |
2484 | } | |
2485 | } else | |
2486 | #endif | |
c78679e8 DM |
2487 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2488 | goto nla_put_failure; | |
7bc570c8 | 2489 | } else if (dst) { |
1da177e4 | 2490 | struct in6_addr saddr_buf; |
c78679e8 DM |
2491 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2492 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2493 | goto nla_put_failure; | |
1da177e4 | 2494 | } |
2d7202bf | 2495 | |
c3968a85 DW |
2496 | if (rt->rt6i_prefsrc.plen) { |
2497 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2498 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2499 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2500 | goto nla_put_failure; | |
c3968a85 DW |
2501 | } |
2502 | ||
defb3519 | 2503 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2504 | goto nla_put_failure; |
2505 | ||
f2c31e32 | 2506 | rcu_read_lock(); |
27217455 | 2507 | n = dst_get_neighbour_noref(&rt->dst); |
94f826b8 ED |
2508 | if (n) { |
2509 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) { | |
2510 | rcu_read_unlock(); | |
2511 | goto nla_put_failure; | |
2512 | } | |
2513 | } | |
f2c31e32 | 2514 | rcu_read_unlock(); |
2d7202bf | 2515 | |
c78679e8 DM |
2516 | if (rt->dst.dev && |
2517 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2518 | goto nla_put_failure; | |
2519 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2520 | goto nla_put_failure; | |
36e3deae YH |
2521 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2522 | expires = 0; | |
d1918542 DM |
2523 | else if (rt->dst.expires - jiffies < INT_MAX) |
2524 | expires = rt->dst.expires - jiffies; | |
36e3deae YH |
2525 | else |
2526 | expires = INT_MAX; | |
69cdf8f9 | 2527 | |
346f870b DM |
2528 | peer = rt->rt6i_peer; |
2529 | ts = tsage = 0; | |
2530 | if (peer && peer->tcp_ts_stamp) { | |
2531 | ts = peer->tcp_ts; | |
2532 | tsage = get_seconds() - peer->tcp_ts_stamp; | |
2533 | } | |
2534 | ||
2535 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage, | |
d8d1f30b | 2536 | expires, rt->dst.error) < 0) |
e3703b3d | 2537 | goto nla_put_failure; |
2d7202bf TG |
2538 | |
2539 | return nlmsg_end(skb, nlh); | |
2540 | ||
2541 | nla_put_failure: | |
26932566 PM |
2542 | nlmsg_cancel(skb, nlh); |
2543 | return -EMSGSIZE; | |
1da177e4 LT |
2544 | } |
2545 | ||
1b43af54 | 2546 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2547 | { |
2548 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2549 | int prefix; | |
2550 | ||
2d7202bf TG |
2551 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2552 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2553 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2554 | } else | |
2555 | prefix = 0; | |
2556 | ||
191cd582 BH |
2557 | return rt6_fill_node(arg->net, |
2558 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2559 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2560 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2561 | } |
2562 | ||
c127ea2c | 2563 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2564 | { |
3b1e0a65 | 2565 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2566 | struct nlattr *tb[RTA_MAX+1]; |
2567 | struct rt6_info *rt; | |
1da177e4 | 2568 | struct sk_buff *skb; |
ab364a6f | 2569 | struct rtmsg *rtm; |
4c9483b2 | 2570 | struct flowi6 fl6; |
72331bc0 | 2571 | int err, iif = 0, oif = 0; |
1da177e4 | 2572 | |
ab364a6f TG |
2573 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2574 | if (err < 0) | |
2575 | goto errout; | |
1da177e4 | 2576 | |
ab364a6f | 2577 | err = -EINVAL; |
4c9483b2 | 2578 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2579 | |
ab364a6f TG |
2580 | if (tb[RTA_SRC]) { |
2581 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2582 | goto errout; | |
2583 | ||
4e3fd7a0 | 2584 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2585 | } |
2586 | ||
2587 | if (tb[RTA_DST]) { | |
2588 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2589 | goto errout; | |
2590 | ||
4e3fd7a0 | 2591 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2592 | } |
2593 | ||
2594 | if (tb[RTA_IIF]) | |
2595 | iif = nla_get_u32(tb[RTA_IIF]); | |
2596 | ||
2597 | if (tb[RTA_OIF]) | |
72331bc0 | 2598 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2599 | |
2600 | if (iif) { | |
2601 | struct net_device *dev; | |
72331bc0 SL |
2602 | int flags = 0; |
2603 | ||
5578689a | 2604 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2605 | if (!dev) { |
2606 | err = -ENODEV; | |
ab364a6f | 2607 | goto errout; |
1da177e4 | 2608 | } |
72331bc0 SL |
2609 | |
2610 | fl6.flowi6_iif = iif; | |
2611 | ||
2612 | if (!ipv6_addr_any(&fl6.saddr)) | |
2613 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2614 | ||
2615 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2616 | flags); | |
2617 | } else { | |
2618 | fl6.flowi6_oif = oif; | |
2619 | ||
2620 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2621 | } |
2622 | ||
ab364a6f | 2623 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2624 | if (!skb) { |
2173bff5 | 2625 | dst_release(&rt->dst); |
ab364a6f TG |
2626 | err = -ENOBUFS; |
2627 | goto errout; | |
2628 | } | |
1da177e4 | 2629 | |
ab364a6f TG |
2630 | /* Reserve room for dummy headers, this skb can pass |
2631 | through good chunk of routing engine. | |
2632 | */ | |
459a98ed | 2633 | skb_reset_mac_header(skb); |
ab364a6f | 2634 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2635 | |
d8d1f30b | 2636 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2637 | |
4c9483b2 | 2638 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2639 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2640 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2641 | if (err < 0) { |
ab364a6f TG |
2642 | kfree_skb(skb); |
2643 | goto errout; | |
1da177e4 LT |
2644 | } |
2645 | ||
5578689a | 2646 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2647 | errout: |
1da177e4 | 2648 | return err; |
1da177e4 LT |
2649 | } |
2650 | ||
86872cb5 | 2651 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2652 | { |
2653 | struct sk_buff *skb; | |
5578689a | 2654 | struct net *net = info->nl_net; |
528c4ceb DL |
2655 | u32 seq; |
2656 | int err; | |
2657 | ||
2658 | err = -ENOBUFS; | |
38308473 | 2659 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2660 | |
339bf98f | 2661 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2662 | if (!skb) |
21713ebc TG |
2663 | goto errout; |
2664 | ||
191cd582 | 2665 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2666 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2667 | if (err < 0) { |
2668 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2669 | WARN_ON(err == -EMSGSIZE); | |
2670 | kfree_skb(skb); | |
2671 | goto errout; | |
2672 | } | |
1ce85fe4 PNA |
2673 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2674 | info->nlh, gfp_any()); | |
2675 | return; | |
21713ebc TG |
2676 | errout: |
2677 | if (err < 0) | |
5578689a | 2678 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2679 | } |
2680 | ||
8ed67789 DL |
2681 | static int ip6_route_dev_notify(struct notifier_block *this, |
2682 | unsigned long event, void *data) | |
2683 | { | |
2684 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2685 | struct net *net = dev_net(dev); |
8ed67789 DL |
2686 | |
2687 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2688 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2689 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2690 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2691 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2692 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2693 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2694 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2695 | #endif | |
2696 | } | |
2697 | ||
2698 | return NOTIFY_OK; | |
2699 | } | |
2700 | ||
1da177e4 LT |
2701 | /* |
2702 | * /proc | |
2703 | */ | |
2704 | ||
2705 | #ifdef CONFIG_PROC_FS | |
2706 | ||
1da177e4 LT |
2707 | struct rt6_proc_arg |
2708 | { | |
2709 | char *buffer; | |
2710 | int offset; | |
2711 | int length; | |
2712 | int skip; | |
2713 | int len; | |
2714 | }; | |
2715 | ||
2716 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2717 | { | |
33120b30 | 2718 | struct seq_file *m = p_arg; |
69cce1d1 | 2719 | struct neighbour *n; |
1da177e4 | 2720 | |
4b7a4274 | 2721 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2722 | |
2723 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2724 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2725 | #else |
33120b30 | 2726 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2727 | #endif |
f2c31e32 | 2728 | rcu_read_lock(); |
27217455 | 2729 | n = dst_get_neighbour_noref(&rt->dst); |
69cce1d1 DM |
2730 | if (n) { |
2731 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2732 | } else { |
33120b30 | 2733 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2734 | } |
f2c31e32 | 2735 | rcu_read_unlock(); |
33120b30 | 2736 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2737 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2738 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2739 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2740 | return 0; |
2741 | } | |
2742 | ||
33120b30 | 2743 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2744 | { |
f3db4851 | 2745 | struct net *net = (struct net *)m->private; |
32b293a5 | 2746 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2747 | return 0; |
2748 | } | |
1da177e4 | 2749 | |
33120b30 AD |
2750 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2751 | { | |
de05c557 | 2752 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2753 | } |
2754 | ||
33120b30 AD |
2755 | static const struct file_operations ipv6_route_proc_fops = { |
2756 | .owner = THIS_MODULE, | |
2757 | .open = ipv6_route_open, | |
2758 | .read = seq_read, | |
2759 | .llseek = seq_lseek, | |
b6fcbdb4 | 2760 | .release = single_release_net, |
33120b30 AD |
2761 | }; |
2762 | ||
1da177e4 LT |
2763 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2764 | { | |
69ddb805 | 2765 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2766 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2767 | net->ipv6.rt6_stats->fib_nodes, |
2768 | net->ipv6.rt6_stats->fib_route_nodes, | |
2769 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2770 | net->ipv6.rt6_stats->fib_rt_entries, | |
2771 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2772 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2773 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2774 | |
2775 | return 0; | |
2776 | } | |
2777 | ||
2778 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2779 | { | |
de05c557 | 2780 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2781 | } |
2782 | ||
9a32144e | 2783 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2784 | .owner = THIS_MODULE, |
2785 | .open = rt6_stats_seq_open, | |
2786 | .read = seq_read, | |
2787 | .llseek = seq_lseek, | |
b6fcbdb4 | 2788 | .release = single_release_net, |
1da177e4 LT |
2789 | }; |
2790 | #endif /* CONFIG_PROC_FS */ | |
2791 | ||
2792 | #ifdef CONFIG_SYSCTL | |
2793 | ||
1da177e4 | 2794 | static |
8d65af78 | 2795 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2796 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2797 | { | |
c486da34 LAG |
2798 | struct net *net; |
2799 | int delay; | |
2800 | if (!write) | |
1da177e4 | 2801 | return -EINVAL; |
c486da34 LAG |
2802 | |
2803 | net = (struct net *)ctl->extra1; | |
2804 | delay = net->ipv6.sysctl.flush_delay; | |
2805 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2806 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2807 | return 0; | |
1da177e4 LT |
2808 | } |
2809 | ||
760f2d01 | 2810 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2811 | { |
1da177e4 | 2812 | .procname = "flush", |
4990509f | 2813 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2814 | .maxlen = sizeof(int), |
89c8b3a1 | 2815 | .mode = 0200, |
6d9f239a | 2816 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2817 | }, |
2818 | { | |
1da177e4 | 2819 | .procname = "gc_thresh", |
9a7ec3a9 | 2820 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2821 | .maxlen = sizeof(int), |
2822 | .mode = 0644, | |
6d9f239a | 2823 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2824 | }, |
2825 | { | |
1da177e4 | 2826 | .procname = "max_size", |
4990509f | 2827 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2828 | .maxlen = sizeof(int), |
2829 | .mode = 0644, | |
6d9f239a | 2830 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2831 | }, |
2832 | { | |
1da177e4 | 2833 | .procname = "gc_min_interval", |
4990509f | 2834 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2835 | .maxlen = sizeof(int), |
2836 | .mode = 0644, | |
6d9f239a | 2837 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2838 | }, |
2839 | { | |
1da177e4 | 2840 | .procname = "gc_timeout", |
4990509f | 2841 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2842 | .maxlen = sizeof(int), |
2843 | .mode = 0644, | |
6d9f239a | 2844 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2845 | }, |
2846 | { | |
1da177e4 | 2847 | .procname = "gc_interval", |
4990509f | 2848 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2849 | .maxlen = sizeof(int), |
2850 | .mode = 0644, | |
6d9f239a | 2851 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2852 | }, |
2853 | { | |
1da177e4 | 2854 | .procname = "gc_elasticity", |
4990509f | 2855 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2856 | .maxlen = sizeof(int), |
2857 | .mode = 0644, | |
f3d3f616 | 2858 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2859 | }, |
2860 | { | |
1da177e4 | 2861 | .procname = "mtu_expires", |
4990509f | 2862 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2863 | .maxlen = sizeof(int), |
2864 | .mode = 0644, | |
6d9f239a | 2865 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2866 | }, |
2867 | { | |
1da177e4 | 2868 | .procname = "min_adv_mss", |
4990509f | 2869 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2870 | .maxlen = sizeof(int), |
2871 | .mode = 0644, | |
f3d3f616 | 2872 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2873 | }, |
2874 | { | |
1da177e4 | 2875 | .procname = "gc_min_interval_ms", |
4990509f | 2876 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2877 | .maxlen = sizeof(int), |
2878 | .mode = 0644, | |
6d9f239a | 2879 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2880 | }, |
f8572d8f | 2881 | { } |
1da177e4 LT |
2882 | }; |
2883 | ||
2c8c1e72 | 2884 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2885 | { |
2886 | struct ctl_table *table; | |
2887 | ||
2888 | table = kmemdup(ipv6_route_table_template, | |
2889 | sizeof(ipv6_route_table_template), | |
2890 | GFP_KERNEL); | |
5ee09105 YH |
2891 | |
2892 | if (table) { | |
2893 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2894 | table[0].extra1 = net; |
86393e52 | 2895 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2896 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2897 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2898 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2899 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2900 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2901 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2902 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2903 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2904 | } |
2905 | ||
760f2d01 DL |
2906 | return table; |
2907 | } | |
1da177e4 LT |
2908 | #endif |
2909 | ||
2c8c1e72 | 2910 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2911 | { |
633d424b | 2912 | int ret = -ENOMEM; |
8ed67789 | 2913 | |
86393e52 AD |
2914 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2915 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2916 | |
fc66f95c ED |
2917 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2918 | goto out_ip6_dst_ops; | |
2919 | ||
8ed67789 DL |
2920 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2921 | sizeof(*net->ipv6.ip6_null_entry), | |
2922 | GFP_KERNEL); | |
2923 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2924 | goto out_ip6_dst_entries; |
d8d1f30b | 2925 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2926 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2927 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2928 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2929 | ip6_template_metrics, true); | |
8ed67789 DL |
2930 | |
2931 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2932 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2933 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2934 | GFP_KERNEL); | |
68fffc67 PZ |
2935 | if (!net->ipv6.ip6_prohibit_entry) |
2936 | goto out_ip6_null_entry; | |
d8d1f30b | 2937 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2938 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2939 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2940 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2941 | ip6_template_metrics, true); | |
8ed67789 DL |
2942 | |
2943 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2944 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2945 | GFP_KERNEL); | |
68fffc67 PZ |
2946 | if (!net->ipv6.ip6_blk_hole_entry) |
2947 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2948 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2949 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2950 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2951 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2952 | ip6_template_metrics, true); | |
8ed67789 DL |
2953 | #endif |
2954 | ||
b339a47c PZ |
2955 | net->ipv6.sysctl.flush_delay = 0; |
2956 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2957 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2958 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2959 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2960 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2961 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2962 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2963 | ||
cdb18761 DL |
2964 | #ifdef CONFIG_PROC_FS |
2965 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2966 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2967 | #endif | |
6891a346 BT |
2968 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2969 | ||
8ed67789 DL |
2970 | ret = 0; |
2971 | out: | |
2972 | return ret; | |
f2fc6a54 | 2973 | |
68fffc67 PZ |
2974 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2975 | out_ip6_prohibit_entry: | |
2976 | kfree(net->ipv6.ip6_prohibit_entry); | |
2977 | out_ip6_null_entry: | |
2978 | kfree(net->ipv6.ip6_null_entry); | |
2979 | #endif | |
fc66f95c ED |
2980 | out_ip6_dst_entries: |
2981 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2982 | out_ip6_dst_ops: |
f2fc6a54 | 2983 | goto out; |
cdb18761 DL |
2984 | } |
2985 | ||
2c8c1e72 | 2986 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2987 | { |
2988 | #ifdef CONFIG_PROC_FS | |
2989 | proc_net_remove(net, "ipv6_route"); | |
2990 | proc_net_remove(net, "rt6_stats"); | |
2991 | #endif | |
8ed67789 DL |
2992 | kfree(net->ipv6.ip6_null_entry); |
2993 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2994 | kfree(net->ipv6.ip6_prohibit_entry); | |
2995 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2996 | #endif | |
41bb78b4 | 2997 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2998 | } |
2999 | ||
3000 | static struct pernet_operations ip6_route_net_ops = { | |
3001 | .init = ip6_route_net_init, | |
3002 | .exit = ip6_route_net_exit, | |
3003 | }; | |
3004 | ||
8ed67789 DL |
3005 | static struct notifier_block ip6_route_dev_notifier = { |
3006 | .notifier_call = ip6_route_dev_notify, | |
3007 | .priority = 0, | |
3008 | }; | |
3009 | ||
433d49c3 | 3010 | int __init ip6_route_init(void) |
1da177e4 | 3011 | { |
433d49c3 DL |
3012 | int ret; |
3013 | ||
9a7ec3a9 DL |
3014 | ret = -ENOMEM; |
3015 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3016 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3017 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3018 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3019 | goto out; |
14e50e57 | 3020 | |
fc66f95c | 3021 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3022 | if (ret) |
bdb3289f | 3023 | goto out_kmem_cache; |
bdb3289f | 3024 | |
fc66f95c ED |
3025 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3026 | if (ret) | |
3027 | goto out_dst_entries; | |
3028 | ||
5dc121e9 AE |
3029 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3030 | ||
8ed67789 DL |
3031 | /* Registering of the loopback is done before this portion of code, |
3032 | * the loopback reference in rt6_info will not be taken, do it | |
3033 | * manually for init_net */ | |
d8d1f30b | 3034 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3035 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3036 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3037 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3038 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3039 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3040 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3041 | #endif | |
433d49c3 DL |
3042 | ret = fib6_init(); |
3043 | if (ret) | |
8ed67789 | 3044 | goto out_register_subsys; |
433d49c3 | 3045 | |
433d49c3 DL |
3046 | ret = xfrm6_init(); |
3047 | if (ret) | |
cdb18761 | 3048 | goto out_fib6_init; |
c35b7e72 | 3049 | |
433d49c3 DL |
3050 | ret = fib6_rules_init(); |
3051 | if (ret) | |
3052 | goto xfrm6_init; | |
7e5449c2 | 3053 | |
433d49c3 | 3054 | ret = -ENOBUFS; |
c7ac8679 GR |
3055 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3056 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3057 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
433d49c3 | 3058 | goto fib6_rules_init; |
c127ea2c | 3059 | |
8ed67789 | 3060 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
3061 | if (ret) |
3062 | goto fib6_rules_init; | |
8ed67789 | 3063 | |
433d49c3 DL |
3064 | out: |
3065 | return ret; | |
3066 | ||
3067 | fib6_rules_init: | |
433d49c3 DL |
3068 | fib6_rules_cleanup(); |
3069 | xfrm6_init: | |
433d49c3 | 3070 | xfrm6_fini(); |
433d49c3 | 3071 | out_fib6_init: |
433d49c3 | 3072 | fib6_gc_cleanup(); |
8ed67789 DL |
3073 | out_register_subsys: |
3074 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
3075 | out_dst_entries: |
3076 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3077 | out_kmem_cache: |
f2fc6a54 | 3078 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3079 | goto out; |
1da177e4 LT |
3080 | } |
3081 | ||
3082 | void ip6_route_cleanup(void) | |
3083 | { | |
8ed67789 | 3084 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 3085 | fib6_rules_cleanup(); |
1da177e4 | 3086 | xfrm6_fini(); |
1da177e4 | 3087 | fib6_gc_cleanup(); |
8ed67789 | 3088 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3089 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3090 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3091 | } |