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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
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 | ||
65 | /* Set to 3 to get tracing. */ | |
66 | #define RT6_DEBUG 2 | |
67 | ||
68 | #if RT6_DEBUG >= 3 | |
69 | #define RDBG(x) printk x | |
70 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
71 | #else | |
72 | #define RDBG(x) | |
73 | #define RT6_TRACE(x...) do { ; } while (0) | |
74 | #endif | |
75 | ||
21efcfa0 ED |
76 | static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort, |
77 | const struct in6_addr *dest); | |
1da177e4 | 78 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 79 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 80 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
81 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
82 | static void ip6_dst_destroy(struct dst_entry *); | |
83 | static void ip6_dst_ifdown(struct dst_entry *, | |
84 | struct net_device *dev, int how); | |
569d3645 | 85 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
86 | |
87 | static int ip6_pkt_discard(struct sk_buff *skb); | |
88 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
89 | static void ip6_link_failure(struct sk_buff *skb); | |
90 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
91 | ||
70ceb4f5 | 92 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 93 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
94 | const struct in6_addr *prefix, int prefixlen, |
95 | const struct in6_addr *gwaddr, int ifindex, | |
70ceb4f5 | 96 | unsigned pref); |
efa2cea0 | 97 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
98 | const struct in6_addr *prefix, int prefixlen, |
99 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
100 | #endif |
101 | ||
06582540 DM |
102 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
103 | { | |
104 | struct rt6_info *rt = (struct rt6_info *) dst; | |
105 | struct inet_peer *peer; | |
106 | u32 *p = NULL; | |
107 | ||
8e2ec639 YZ |
108 | if (!(rt->dst.flags & DST_HOST)) |
109 | return NULL; | |
110 | ||
06582540 DM |
111 | if (!rt->rt6i_peer) |
112 | rt6_bind_peer(rt, 1); | |
113 | ||
114 | peer = rt->rt6i_peer; | |
115 | if (peer) { | |
116 | u32 *old_p = __DST_METRICS_PTR(old); | |
117 | unsigned long prev, new; | |
118 | ||
119 | p = peer->metrics; | |
120 | if (inet_metrics_new(peer)) | |
121 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
122 | ||
123 | new = (unsigned long) p; | |
124 | prev = cmpxchg(&dst->_metrics, old, new); | |
125 | ||
126 | if (prev != old) { | |
127 | p = __DST_METRICS_PTR(prev); | |
128 | if (prev & DST_METRICS_READ_ONLY) | |
129 | p = NULL; | |
130 | } | |
131 | } | |
132 | return p; | |
133 | } | |
134 | ||
d3aaeb38 DM |
135 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
136 | { | |
137 | return __neigh_lookup_errno(&nd_tbl, daddr, dst->dev); | |
138 | } | |
139 | ||
9a7ec3a9 | 140 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 141 | .family = AF_INET6, |
09640e63 | 142 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
143 | .gc = ip6_dst_gc, |
144 | .gc_thresh = 1024, | |
145 | .check = ip6_dst_check, | |
0dbaee3b | 146 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 147 | .mtu = ip6_mtu, |
06582540 | 148 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
149 | .destroy = ip6_dst_destroy, |
150 | .ifdown = ip6_dst_ifdown, | |
151 | .negative_advice = ip6_negative_advice, | |
152 | .link_failure = ip6_link_failure, | |
153 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 154 | .local_out = __ip6_local_out, |
d3aaeb38 | 155 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
156 | }; |
157 | ||
ebb762f2 | 158 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 159 | { |
618f9bc7 SK |
160 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
161 | ||
162 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
163 | } |
164 | ||
14e50e57 DM |
165 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
166 | { | |
167 | } | |
168 | ||
0972ddb2 HB |
169 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
170 | unsigned long old) | |
171 | { | |
172 | return NULL; | |
173 | } | |
174 | ||
14e50e57 DM |
175 | static struct dst_ops ip6_dst_blackhole_ops = { |
176 | .family = AF_INET6, | |
09640e63 | 177 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
178 | .destroy = ip6_dst_destroy, |
179 | .check = ip6_dst_check, | |
ebb762f2 | 180 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 181 | .default_advmss = ip6_default_advmss, |
14e50e57 | 182 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 183 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 184 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
185 | }; |
186 | ||
62fa8a84 DM |
187 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
188 | [RTAX_HOPLIMIT - 1] = 255, | |
189 | }; | |
190 | ||
bdb3289f | 191 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
192 | .dst = { |
193 | .__refcnt = ATOMIC_INIT(1), | |
194 | .__use = 1, | |
195 | .obsolete = -1, | |
196 | .error = -ENETUNREACH, | |
d8d1f30b CG |
197 | .input = ip6_pkt_discard, |
198 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
199 | }, |
200 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 201 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
202 | .rt6i_metric = ~(u32) 0, |
203 | .rt6i_ref = ATOMIC_INIT(1), | |
204 | }; | |
205 | ||
101367c2 TG |
206 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
207 | ||
6723ab54 DM |
208 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
209 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 210 | |
280a34c8 | 211 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
212 | .dst = { |
213 | .__refcnt = ATOMIC_INIT(1), | |
214 | .__use = 1, | |
215 | .obsolete = -1, | |
216 | .error = -EACCES, | |
d8d1f30b CG |
217 | .input = ip6_pkt_prohibit, |
218 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
219 | }, |
220 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 221 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
222 | .rt6i_metric = ~(u32) 0, |
223 | .rt6i_ref = ATOMIC_INIT(1), | |
224 | }; | |
225 | ||
bdb3289f | 226 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
227 | .dst = { |
228 | .__refcnt = ATOMIC_INIT(1), | |
229 | .__use = 1, | |
230 | .obsolete = -1, | |
231 | .error = -EINVAL, | |
d8d1f30b CG |
232 | .input = dst_discard, |
233 | .output = dst_discard, | |
101367c2 TG |
234 | }, |
235 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 236 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
237 | .rt6i_metric = ~(u32) 0, |
238 | .rt6i_ref = ATOMIC_INIT(1), | |
239 | }; | |
240 | ||
241 | #endif | |
242 | ||
1da177e4 | 243 | /* allocate dst with ip6_dst_ops */ |
5c1e6aa3 | 244 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops, |
957c665f DM |
245 | struct net_device *dev, |
246 | int flags) | |
1da177e4 | 247 | { |
957c665f | 248 | struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags); |
cf911662 | 249 | |
38308473 | 250 | if (rt) |
fbe58186 | 251 | memset(&rt->rt6i_table, 0, |
38308473 | 252 | sizeof(*rt) - sizeof(struct dst_entry)); |
cf911662 DM |
253 | |
254 | return rt; | |
1da177e4 LT |
255 | } |
256 | ||
257 | static void ip6_dst_destroy(struct dst_entry *dst) | |
258 | { | |
259 | struct rt6_info *rt = (struct rt6_info *)dst; | |
260 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 261 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 | 262 | |
8e2ec639 YZ |
263 | if (!(rt->dst.flags & DST_HOST)) |
264 | dst_destroy_metrics_generic(dst); | |
265 | ||
38308473 | 266 | if (idev) { |
1da177e4 LT |
267 | rt->rt6i_idev = NULL; |
268 | in6_dev_put(idev); | |
1ab1457c | 269 | } |
b3419363 | 270 | if (peer) { |
b3419363 DM |
271 | rt->rt6i_peer = NULL; |
272 | inet_putpeer(peer); | |
273 | } | |
274 | } | |
275 | ||
6431cbc2 DM |
276 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
277 | ||
278 | static u32 rt6_peer_genid(void) | |
279 | { | |
280 | return atomic_read(&__rt6_peer_genid); | |
281 | } | |
282 | ||
b3419363 DM |
283 | void rt6_bind_peer(struct rt6_info *rt, int create) |
284 | { | |
285 | struct inet_peer *peer; | |
286 | ||
b3419363 DM |
287 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
288 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
289 | inet_putpeer(peer); | |
6431cbc2 DM |
290 | else |
291 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1da177e4 LT |
292 | } |
293 | ||
294 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
295 | int how) | |
296 | { | |
297 | struct rt6_info *rt = (struct rt6_info *)dst; | |
298 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 299 | struct net_device *loopback_dev = |
c346dca1 | 300 | dev_net(dev)->loopback_dev; |
1da177e4 | 301 | |
38308473 | 302 | if (dev != loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 DL |
303 | struct inet6_dev *loopback_idev = |
304 | in6_dev_get(loopback_dev); | |
38308473 | 305 | if (loopback_idev) { |
1da177e4 LT |
306 | rt->rt6i_idev = loopback_idev; |
307 | in6_dev_put(idev); | |
308 | } | |
309 | } | |
310 | } | |
311 | ||
312 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
313 | { | |
a02cec21 ED |
314 | return (rt->rt6i_flags & RTF_EXPIRES) && |
315 | time_after(jiffies, rt->rt6i_expires); | |
1da177e4 LT |
316 | } |
317 | ||
b71d1d42 | 318 | static inline int rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 319 | { |
a02cec21 ED |
320 | return ipv6_addr_type(daddr) & |
321 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
322 | } |
323 | ||
1da177e4 | 324 | /* |
c71099ac | 325 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
326 | */ |
327 | ||
8ed67789 DL |
328 | static inline struct rt6_info *rt6_device_match(struct net *net, |
329 | struct rt6_info *rt, | |
b71d1d42 | 330 | const struct in6_addr *saddr, |
1da177e4 | 331 | int oif, |
d420895e | 332 | int flags) |
1da177e4 LT |
333 | { |
334 | struct rt6_info *local = NULL; | |
335 | struct rt6_info *sprt; | |
336 | ||
dd3abc4e YH |
337 | if (!oif && ipv6_addr_any(saddr)) |
338 | goto out; | |
339 | ||
d8d1f30b | 340 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
dd3abc4e YH |
341 | struct net_device *dev = sprt->rt6i_dev; |
342 | ||
343 | if (oif) { | |
1da177e4 LT |
344 | if (dev->ifindex == oif) |
345 | return sprt; | |
346 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 347 | if (!sprt->rt6i_idev || |
1da177e4 | 348 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 349 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 350 | continue; |
1ab1457c | 351 | if (local && (!oif || |
1da177e4 LT |
352 | local->rt6i_idev->dev->ifindex == oif)) |
353 | continue; | |
354 | } | |
355 | local = sprt; | |
356 | } | |
dd3abc4e YH |
357 | } else { |
358 | if (ipv6_chk_addr(net, saddr, dev, | |
359 | flags & RT6_LOOKUP_F_IFACE)) | |
360 | return sprt; | |
1da177e4 | 361 | } |
dd3abc4e | 362 | } |
1da177e4 | 363 | |
dd3abc4e | 364 | if (oif) { |
1da177e4 LT |
365 | if (local) |
366 | return local; | |
367 | ||
d420895e | 368 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 369 | return net->ipv6.ip6_null_entry; |
1da177e4 | 370 | } |
dd3abc4e | 371 | out: |
1da177e4 LT |
372 | return rt; |
373 | } | |
374 | ||
27097255 YH |
375 | #ifdef CONFIG_IPV6_ROUTER_PREF |
376 | static void rt6_probe(struct rt6_info *rt) | |
377 | { | |
f2c31e32 | 378 | struct neighbour *neigh; |
27097255 YH |
379 | /* |
380 | * Okay, this does not seem to be appropriate | |
381 | * for now, however, we need to check if it | |
382 | * is really so; aka Router Reachability Probing. | |
383 | * | |
384 | * Router Reachability Probe MUST be rate-limited | |
385 | * to no more than one per minute. | |
386 | */ | |
f2c31e32 | 387 | rcu_read_lock(); |
27217455 | 388 | neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL; |
27097255 | 389 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
f2c31e32 | 390 | goto out; |
27097255 YH |
391 | read_lock_bh(&neigh->lock); |
392 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 393 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
394 | struct in6_addr mcaddr; |
395 | struct in6_addr *target; | |
396 | ||
397 | neigh->updated = jiffies; | |
398 | read_unlock_bh(&neigh->lock); | |
399 | ||
400 | target = (struct in6_addr *)&neigh->primary_key; | |
401 | addrconf_addr_solict_mult(target, &mcaddr); | |
402 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
f2c31e32 | 403 | } else { |
27097255 | 404 | read_unlock_bh(&neigh->lock); |
f2c31e32 ED |
405 | } |
406 | out: | |
407 | rcu_read_unlock(); | |
27097255 YH |
408 | } |
409 | #else | |
410 | static inline void rt6_probe(struct rt6_info *rt) | |
411 | { | |
27097255 YH |
412 | } |
413 | #endif | |
414 | ||
1da177e4 | 415 | /* |
554cfb7e | 416 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 417 | */ |
b6f99a21 | 418 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
419 | { |
420 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 421 | if (!oif || dev->ifindex == oif) |
554cfb7e | 422 | return 2; |
161980f4 DM |
423 | if ((dev->flags & IFF_LOOPBACK) && |
424 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
425 | return 1; | |
426 | return 0; | |
554cfb7e | 427 | } |
1da177e4 | 428 | |
b6f99a21 | 429 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 430 | { |
f2c31e32 | 431 | struct neighbour *neigh; |
398bcbeb | 432 | int m; |
f2c31e32 ED |
433 | |
434 | rcu_read_lock(); | |
27217455 | 435 | neigh = dst_get_neighbour_noref(&rt->dst); |
4d0c5911 YH |
436 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
437 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
438 | m = 1; | |
439 | else if (neigh) { | |
554cfb7e YH |
440 | read_lock_bh(&neigh->lock); |
441 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 442 | m = 2; |
398bcbeb YH |
443 | #ifdef CONFIG_IPV6_ROUTER_PREF |
444 | else if (neigh->nud_state & NUD_FAILED) | |
445 | m = 0; | |
446 | #endif | |
447 | else | |
ea73ee23 | 448 | m = 1; |
554cfb7e | 449 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
450 | } else |
451 | m = 0; | |
f2c31e32 | 452 | rcu_read_unlock(); |
554cfb7e | 453 | return m; |
1da177e4 LT |
454 | } |
455 | ||
554cfb7e YH |
456 | static int rt6_score_route(struct rt6_info *rt, int oif, |
457 | int strict) | |
1da177e4 | 458 | { |
4d0c5911 | 459 | int m, n; |
1ab1457c | 460 | |
4d0c5911 | 461 | m = rt6_check_dev(rt, oif); |
77d16f45 | 462 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 463 | return -1; |
ebacaaa0 YH |
464 | #ifdef CONFIG_IPV6_ROUTER_PREF |
465 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
466 | #endif | |
4d0c5911 | 467 | n = rt6_check_neigh(rt); |
557e92ef | 468 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
469 | return -1; |
470 | return m; | |
471 | } | |
472 | ||
f11e6659 DM |
473 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
474 | int *mpri, struct rt6_info *match) | |
554cfb7e | 475 | { |
f11e6659 DM |
476 | int m; |
477 | ||
478 | if (rt6_check_expired(rt)) | |
479 | goto out; | |
480 | ||
481 | m = rt6_score_route(rt, oif, strict); | |
482 | if (m < 0) | |
483 | goto out; | |
484 | ||
485 | if (m > *mpri) { | |
486 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
487 | rt6_probe(match); | |
488 | *mpri = m; | |
489 | match = rt; | |
490 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
491 | rt6_probe(rt); | |
492 | } | |
493 | ||
494 | out: | |
495 | return match; | |
496 | } | |
497 | ||
498 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
499 | struct rt6_info *rr_head, | |
500 | u32 metric, int oif, int strict) | |
501 | { | |
502 | struct rt6_info *rt, *match; | |
554cfb7e | 503 | int mpri = -1; |
1da177e4 | 504 | |
f11e6659 DM |
505 | match = NULL; |
506 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 507 | rt = rt->dst.rt6_next) |
f11e6659 DM |
508 | match = find_match(rt, oif, strict, &mpri, match); |
509 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 510 | rt = rt->dst.rt6_next) |
f11e6659 | 511 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 512 | |
f11e6659 DM |
513 | return match; |
514 | } | |
1da177e4 | 515 | |
f11e6659 DM |
516 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
517 | { | |
518 | struct rt6_info *match, *rt0; | |
8ed67789 | 519 | struct net *net; |
1da177e4 | 520 | |
f11e6659 | 521 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 522 | __func__, fn->leaf, oif); |
554cfb7e | 523 | |
f11e6659 DM |
524 | rt0 = fn->rr_ptr; |
525 | if (!rt0) | |
526 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 527 | |
f11e6659 | 528 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 529 | |
554cfb7e | 530 | if (!match && |
f11e6659 | 531 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 532 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 533 | |
554cfb7e | 534 | /* no entries matched; do round-robin */ |
f11e6659 DM |
535 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
536 | next = fn->leaf; | |
537 | ||
538 | if (next != rt0) | |
539 | fn->rr_ptr = next; | |
1da177e4 | 540 | } |
1da177e4 | 541 | |
f11e6659 | 542 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 543 | __func__, match); |
1da177e4 | 544 | |
c346dca1 | 545 | net = dev_net(rt0->rt6i_dev); |
a02cec21 | 546 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
547 | } |
548 | ||
70ceb4f5 YH |
549 | #ifdef CONFIG_IPV6_ROUTE_INFO |
550 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 551 | const struct in6_addr *gwaddr) |
70ceb4f5 | 552 | { |
c346dca1 | 553 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
554 | struct route_info *rinfo = (struct route_info *) opt; |
555 | struct in6_addr prefix_buf, *prefix; | |
556 | unsigned int pref; | |
4bed72e4 | 557 | unsigned long lifetime; |
70ceb4f5 YH |
558 | struct rt6_info *rt; |
559 | ||
560 | if (len < sizeof(struct route_info)) { | |
561 | return -EINVAL; | |
562 | } | |
563 | ||
564 | /* Sanity check for prefix_len and length */ | |
565 | if (rinfo->length > 3) { | |
566 | return -EINVAL; | |
567 | } else if (rinfo->prefix_len > 128) { | |
568 | return -EINVAL; | |
569 | } else if (rinfo->prefix_len > 64) { | |
570 | if (rinfo->length < 2) { | |
571 | return -EINVAL; | |
572 | } | |
573 | } else if (rinfo->prefix_len > 0) { | |
574 | if (rinfo->length < 1) { | |
575 | return -EINVAL; | |
576 | } | |
577 | } | |
578 | ||
579 | pref = rinfo->route_pref; | |
580 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 581 | return -EINVAL; |
70ceb4f5 | 582 | |
4bed72e4 | 583 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
584 | |
585 | if (rinfo->length == 3) | |
586 | prefix = (struct in6_addr *)rinfo->prefix; | |
587 | else { | |
588 | /* this function is safe */ | |
589 | ipv6_addr_prefix(&prefix_buf, | |
590 | (struct in6_addr *)rinfo->prefix, | |
591 | rinfo->prefix_len); | |
592 | prefix = &prefix_buf; | |
593 | } | |
594 | ||
efa2cea0 DL |
595 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
596 | dev->ifindex); | |
70ceb4f5 YH |
597 | |
598 | if (rt && !lifetime) { | |
e0a1ad73 | 599 | ip6_del_rt(rt); |
70ceb4f5 YH |
600 | rt = NULL; |
601 | } | |
602 | ||
603 | if (!rt && lifetime) | |
efa2cea0 | 604 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
605 | pref); |
606 | else if (rt) | |
607 | rt->rt6i_flags = RTF_ROUTEINFO | | |
608 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
609 | ||
610 | if (rt) { | |
4bed72e4 | 611 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
612 | rt->rt6i_flags &= ~RTF_EXPIRES; |
613 | } else { | |
614 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
615 | rt->rt6i_flags |= RTF_EXPIRES; | |
616 | } | |
d8d1f30b | 617 | dst_release(&rt->dst); |
70ceb4f5 YH |
618 | } |
619 | return 0; | |
620 | } | |
621 | #endif | |
622 | ||
8ed67789 | 623 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 624 | do { \ |
8ed67789 | 625 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 626 | struct fib6_node *pn; \ |
e0eda7bb | 627 | while (1) { \ |
982f56f3 YH |
628 | if (fn->fn_flags & RTN_TL_ROOT) \ |
629 | goto out; \ | |
630 | pn = fn->parent; \ | |
631 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 632 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
633 | else \ |
634 | fn = pn; \ | |
635 | if (fn->fn_flags & RTN_RTINFO) \ | |
636 | goto restart; \ | |
c71099ac | 637 | } \ |
c71099ac | 638 | } \ |
38308473 | 639 | } while (0) |
c71099ac | 640 | |
8ed67789 DL |
641 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
642 | struct fib6_table *table, | |
4c9483b2 | 643 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
644 | { |
645 | struct fib6_node *fn; | |
646 | struct rt6_info *rt; | |
647 | ||
c71099ac | 648 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 649 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
650 | restart: |
651 | rt = fn->leaf; | |
4c9483b2 DM |
652 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
653 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 654 | out: |
d8d1f30b | 655 | dst_use(&rt->dst, jiffies); |
c71099ac | 656 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
657 | return rt; |
658 | ||
659 | } | |
660 | ||
9acd9f3a YH |
661 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
662 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 663 | { |
4c9483b2 DM |
664 | struct flowi6 fl6 = { |
665 | .flowi6_oif = oif, | |
666 | .daddr = *daddr, | |
c71099ac TG |
667 | }; |
668 | struct dst_entry *dst; | |
77d16f45 | 669 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 670 | |
adaa70bb | 671 | if (saddr) { |
4c9483b2 | 672 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
673 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
674 | } | |
675 | ||
4c9483b2 | 676 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
677 | if (dst->error == 0) |
678 | return (struct rt6_info *) dst; | |
679 | ||
680 | dst_release(dst); | |
681 | ||
1da177e4 LT |
682 | return NULL; |
683 | } | |
684 | ||
7159039a YH |
685 | EXPORT_SYMBOL(rt6_lookup); |
686 | ||
c71099ac | 687 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
688 | It takes new route entry, the addition fails by any reason the |
689 | route is freed. In any case, if caller does not hold it, it may | |
690 | be destroyed. | |
691 | */ | |
692 | ||
86872cb5 | 693 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
694 | { |
695 | int err; | |
c71099ac | 696 | struct fib6_table *table; |
1da177e4 | 697 | |
c71099ac TG |
698 | table = rt->rt6i_table; |
699 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 700 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 701 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
702 | |
703 | return err; | |
704 | } | |
705 | ||
40e22e8f TG |
706 | int ip6_ins_rt(struct rt6_info *rt) |
707 | { | |
4d1169c1 | 708 | struct nl_info info = { |
c346dca1 | 709 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 710 | }; |
528c4ceb | 711 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
712 | } |
713 | ||
21efcfa0 ED |
714 | static struct rt6_info *rt6_alloc_cow(const struct rt6_info *ort, |
715 | const struct in6_addr *daddr, | |
b71d1d42 | 716 | const struct in6_addr *saddr) |
1da177e4 | 717 | { |
1da177e4 LT |
718 | struct rt6_info *rt; |
719 | ||
720 | /* | |
721 | * Clone the route. | |
722 | */ | |
723 | ||
21efcfa0 | 724 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
725 | |
726 | if (rt) { | |
14deae41 DM |
727 | struct neighbour *neigh; |
728 | int attempts = !in_softirq(); | |
729 | ||
38308473 | 730 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
58c4fb86 | 731 | if (rt->rt6i_dst.plen != 128 && |
21efcfa0 | 732 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 733 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 734 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 735 | } |
1da177e4 | 736 | |
1da177e4 | 737 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
738 | |
739 | #ifdef CONFIG_IPV6_SUBTREES | |
740 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 741 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
742 | rt->rt6i_src.plen = 128; |
743 | } | |
744 | #endif | |
745 | ||
14deae41 | 746 | retry: |
04a6f441 DM |
747 | neigh = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, |
748 | rt->rt6i_dev); | |
14deae41 DM |
749 | if (IS_ERR(neigh)) { |
750 | struct net *net = dev_net(rt->rt6i_dev); | |
751 | int saved_rt_min_interval = | |
752 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
753 | int saved_rt_elasticity = | |
754 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
755 | ||
756 | if (attempts-- > 0) { | |
757 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
758 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
759 | ||
86393e52 | 760 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
761 | |
762 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
763 | saved_rt_elasticity; | |
764 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
765 | saved_rt_min_interval; | |
766 | goto retry; | |
767 | } | |
768 | ||
769 | if (net_ratelimit()) | |
770 | printk(KERN_WARNING | |
7e1b33e5 | 771 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 772 | dst_free(&rt->dst); |
14deae41 DM |
773 | return NULL; |
774 | } | |
69cce1d1 | 775 | dst_set_neighbour(&rt->dst, neigh); |
1da177e4 | 776 | |
95a9a5ba | 777 | } |
1da177e4 | 778 | |
95a9a5ba YH |
779 | return rt; |
780 | } | |
1da177e4 | 781 | |
21efcfa0 ED |
782 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
783 | const struct in6_addr *daddr) | |
299d9939 | 784 | { |
21efcfa0 ED |
785 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
786 | ||
299d9939 | 787 | if (rt) { |
299d9939 | 788 | rt->rt6i_flags |= RTF_CACHE; |
27217455 | 789 | dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst))); |
299d9939 YH |
790 | } |
791 | return rt; | |
792 | } | |
793 | ||
8ed67789 | 794 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 795 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
796 | { |
797 | struct fib6_node *fn; | |
519fbd87 | 798 | struct rt6_info *rt, *nrt; |
c71099ac | 799 | int strict = 0; |
1da177e4 | 800 | int attempts = 3; |
519fbd87 | 801 | int err; |
53b7997f | 802 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 803 | |
77d16f45 | 804 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
805 | |
806 | relookup: | |
c71099ac | 807 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 808 | |
8238dd06 | 809 | restart_2: |
4c9483b2 | 810 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
811 | |
812 | restart: | |
4acad72d | 813 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 814 | |
4c9483b2 | 815 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 816 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 817 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 818 | goto out; |
1da177e4 | 819 | |
d8d1f30b | 820 | dst_hold(&rt->dst); |
c71099ac | 821 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 822 | |
27217455 | 823 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 824 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 825 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 826 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
827 | else |
828 | goto out2; | |
e40cf353 | 829 | |
d8d1f30b | 830 | dst_release(&rt->dst); |
8ed67789 | 831 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 832 | |
d8d1f30b | 833 | dst_hold(&rt->dst); |
519fbd87 | 834 | if (nrt) { |
40e22e8f | 835 | err = ip6_ins_rt(nrt); |
519fbd87 | 836 | if (!err) |
1da177e4 | 837 | goto out2; |
1da177e4 | 838 | } |
1da177e4 | 839 | |
519fbd87 YH |
840 | if (--attempts <= 0) |
841 | goto out2; | |
842 | ||
843 | /* | |
c71099ac | 844 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
845 | * released someone could insert this route. Relookup. |
846 | */ | |
d8d1f30b | 847 | dst_release(&rt->dst); |
519fbd87 YH |
848 | goto relookup; |
849 | ||
850 | out: | |
8238dd06 YH |
851 | if (reachable) { |
852 | reachable = 0; | |
853 | goto restart_2; | |
854 | } | |
d8d1f30b | 855 | dst_hold(&rt->dst); |
c71099ac | 856 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 857 | out2: |
d8d1f30b CG |
858 | rt->dst.lastuse = jiffies; |
859 | rt->dst.__use++; | |
c71099ac TG |
860 | |
861 | return rt; | |
1da177e4 LT |
862 | } |
863 | ||
8ed67789 | 864 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 865 | struct flowi6 *fl6, int flags) |
4acad72d | 866 | { |
4c9483b2 | 867 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
868 | } |
869 | ||
c71099ac TG |
870 | void ip6_route_input(struct sk_buff *skb) |
871 | { | |
b71d1d42 | 872 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 873 | struct net *net = dev_net(skb->dev); |
adaa70bb | 874 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
875 | struct flowi6 fl6 = { |
876 | .flowi6_iif = skb->dev->ifindex, | |
877 | .daddr = iph->daddr, | |
878 | .saddr = iph->saddr, | |
38308473 | 879 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
880 | .flowi6_mark = skb->mark, |
881 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 882 | }; |
adaa70bb | 883 | |
1d6e55f1 | 884 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 885 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 886 | |
4c9483b2 | 887 | skb_dst_set(skb, fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_input)); |
c71099ac TG |
888 | } |
889 | ||
8ed67789 | 890 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 891 | struct flowi6 *fl6, int flags) |
1da177e4 | 892 | { |
4c9483b2 | 893 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
894 | } |
895 | ||
9c7a4f9c | 896 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 897 | struct flowi6 *fl6) |
c71099ac TG |
898 | { |
899 | int flags = 0; | |
900 | ||
4c9483b2 | 901 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 902 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 903 | |
4c9483b2 | 904 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 905 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
906 | else if (sk) |
907 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 908 | |
4c9483b2 | 909 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
910 | } |
911 | ||
7159039a | 912 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 913 | |
2774c131 | 914 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 915 | { |
5c1e6aa3 | 916 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
917 | struct dst_entry *new = NULL; |
918 | ||
5c1e6aa3 | 919 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 920 | if (rt) { |
cf911662 DM |
921 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
922 | ||
d8d1f30b | 923 | new = &rt->dst; |
14e50e57 | 924 | |
14e50e57 | 925 | new->__use = 1; |
352e512c HX |
926 | new->input = dst_discard; |
927 | new->output = dst_discard; | |
14e50e57 | 928 | |
21efcfa0 ED |
929 | if (dst_metrics_read_only(&ort->dst)) |
930 | new->_metrics = ort->dst._metrics; | |
931 | else | |
932 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
933 | rt->rt6i_idev = ort->rt6i_idev; |
934 | if (rt->rt6i_idev) | |
935 | in6_dev_hold(rt->rt6i_idev); | |
936 | rt->rt6i_expires = 0; | |
937 | ||
4e3fd7a0 | 938 | rt->rt6i_gateway = ort->rt6i_gateway; |
14e50e57 DM |
939 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
940 | rt->rt6i_metric = 0; | |
941 | ||
942 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
943 | #ifdef CONFIG_IPV6_SUBTREES | |
944 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
945 | #endif | |
946 | ||
947 | dst_free(new); | |
948 | } | |
949 | ||
69ead7af DM |
950 | dst_release(dst_orig); |
951 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 952 | } |
14e50e57 | 953 | |
1da177e4 LT |
954 | /* |
955 | * Destination cache support functions | |
956 | */ | |
957 | ||
958 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
959 | { | |
960 | struct rt6_info *rt; | |
961 | ||
962 | rt = (struct rt6_info *) dst; | |
963 | ||
6431cbc2 DM |
964 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
965 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
966 | if (!rt->rt6i_peer) | |
967 | rt6_bind_peer(rt, 0); | |
968 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
969 | } | |
1da177e4 | 970 | return dst; |
6431cbc2 | 971 | } |
1da177e4 LT |
972 | return NULL; |
973 | } | |
974 | ||
975 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
976 | { | |
977 | struct rt6_info *rt = (struct rt6_info *) dst; | |
978 | ||
979 | if (rt) { | |
54c1a859 YH |
980 | if (rt->rt6i_flags & RTF_CACHE) { |
981 | if (rt6_check_expired(rt)) { | |
982 | ip6_del_rt(rt); | |
983 | dst = NULL; | |
984 | } | |
985 | } else { | |
1da177e4 | 986 | dst_release(dst); |
54c1a859 YH |
987 | dst = NULL; |
988 | } | |
1da177e4 | 989 | } |
54c1a859 | 990 | return dst; |
1da177e4 LT |
991 | } |
992 | ||
993 | static void ip6_link_failure(struct sk_buff *skb) | |
994 | { | |
995 | struct rt6_info *rt; | |
996 | ||
3ffe533c | 997 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 998 | |
adf30907 | 999 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1000 | if (rt) { |
38308473 | 1001 | if (rt->rt6i_flags & RTF_CACHE) { |
d8d1f30b | 1002 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
1003 | rt->rt6i_flags |= RTF_EXPIRES; |
1004 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1005 | rt->rt6i_node->fn_sernum = -1; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1010 | { | |
1011 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1012 | ||
1013 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
1014 | rt6->rt6i_flags |= RTF_MODIFIED; | |
1015 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1016 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1017 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1018 | features |= RTAX_FEATURE_ALLFRAG; |
1019 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1020 | } |
defb3519 | 1021 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
1022 | } |
1023 | } | |
1024 | ||
0dbaee3b | 1025 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1026 | { |
0dbaee3b DM |
1027 | struct net_device *dev = dst->dev; |
1028 | unsigned int mtu = dst_mtu(dst); | |
1029 | struct net *net = dev_net(dev); | |
1030 | ||
1da177e4 LT |
1031 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1032 | ||
5578689a DL |
1033 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1034 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1035 | |
1036 | /* | |
1ab1457c YH |
1037 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1038 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1039 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1040 | * rely only on pmtu discovery" |
1041 | */ | |
1042 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1043 | mtu = IPV6_MAXPLEN; | |
1044 | return mtu; | |
1045 | } | |
1046 | ||
ebb762f2 | 1047 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1048 | { |
d33e4553 | 1049 | struct inet6_dev *idev; |
618f9bc7 SK |
1050 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1051 | ||
1052 | if (mtu) | |
1053 | return mtu; | |
1054 | ||
1055 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1056 | |
1057 | rcu_read_lock(); | |
1058 | idev = __in6_dev_get(dst->dev); | |
1059 | if (idev) | |
1060 | mtu = idev->cnf.mtu6; | |
1061 | rcu_read_unlock(); | |
1062 | ||
1063 | return mtu; | |
1064 | } | |
1065 | ||
3b00944c YH |
1066 | static struct dst_entry *icmp6_dst_gc_list; |
1067 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1068 | |
3b00944c | 1069 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1070 | struct neighbour *neigh, |
9acd9f3a | 1071 | const struct in6_addr *addr) |
1da177e4 LT |
1072 | { |
1073 | struct rt6_info *rt; | |
1074 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1075 | struct net *net = dev_net(dev); |
1da177e4 | 1076 | |
38308473 | 1077 | if (unlikely(!idev)) |
1da177e4 LT |
1078 | return NULL; |
1079 | ||
957c665f | 1080 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0); |
38308473 | 1081 | if (unlikely(!rt)) { |
1da177e4 LT |
1082 | in6_dev_put(idev); |
1083 | goto out; | |
1084 | } | |
1085 | ||
1da177e4 LT |
1086 | if (neigh) |
1087 | neigh_hold(neigh); | |
14deae41 | 1088 | else { |
04a6f441 | 1089 | neigh = __neigh_lookup_errno(&nd_tbl, addr, dev); |
14deae41 DM |
1090 | if (IS_ERR(neigh)) |
1091 | neigh = NULL; | |
1092 | } | |
1da177e4 | 1093 | |
8e2ec639 YZ |
1094 | rt->dst.flags |= DST_HOST; |
1095 | rt->dst.output = ip6_output; | |
69cce1d1 | 1096 | dst_set_neighbour(&rt->dst, neigh); |
d8d1f30b | 1097 | atomic_set(&rt->dst.__refcnt, 1); |
4e3fd7a0 | 1098 | rt->rt6i_dst.addr = *addr; |
8e2ec639 YZ |
1099 | rt->rt6i_dst.plen = 128; |
1100 | rt->rt6i_idev = idev; | |
7011687f | 1101 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1102 | |
3b00944c | 1103 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1104 | rt->dst.next = icmp6_dst_gc_list; |
1105 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1106 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1107 | |
5578689a | 1108 | fib6_force_start_gc(net); |
1da177e4 LT |
1109 | |
1110 | out: | |
d8d1f30b | 1111 | return &rt->dst; |
1da177e4 LT |
1112 | } |
1113 | ||
3d0f24a7 | 1114 | int icmp6_dst_gc(void) |
1da177e4 | 1115 | { |
e9476e95 | 1116 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1117 | int more = 0; |
1da177e4 | 1118 | |
3b00944c YH |
1119 | spin_lock_bh(&icmp6_dst_lock); |
1120 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1121 | |
1da177e4 LT |
1122 | while ((dst = *pprev) != NULL) { |
1123 | if (!atomic_read(&dst->__refcnt)) { | |
1124 | *pprev = dst->next; | |
1125 | dst_free(dst); | |
1da177e4 LT |
1126 | } else { |
1127 | pprev = &dst->next; | |
3d0f24a7 | 1128 | ++more; |
1da177e4 LT |
1129 | } |
1130 | } | |
1131 | ||
3b00944c | 1132 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1133 | |
3d0f24a7 | 1134 | return more; |
1da177e4 LT |
1135 | } |
1136 | ||
1e493d19 DM |
1137 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1138 | void *arg) | |
1139 | { | |
1140 | struct dst_entry *dst, **pprev; | |
1141 | ||
1142 | spin_lock_bh(&icmp6_dst_lock); | |
1143 | pprev = &icmp6_dst_gc_list; | |
1144 | while ((dst = *pprev) != NULL) { | |
1145 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1146 | if (func(rt, arg)) { | |
1147 | *pprev = dst->next; | |
1148 | dst_free(dst); | |
1149 | } else { | |
1150 | pprev = &dst->next; | |
1151 | } | |
1152 | } | |
1153 | spin_unlock_bh(&icmp6_dst_lock); | |
1154 | } | |
1155 | ||
569d3645 | 1156 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1157 | { |
1da177e4 | 1158 | unsigned long now = jiffies; |
86393e52 | 1159 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1160 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1161 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1162 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1163 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1164 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1165 | int entries; |
7019b78e | 1166 | |
fc66f95c | 1167 | entries = dst_entries_get_fast(ops); |
7019b78e | 1168 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1169 | entries <= rt_max_size) |
1da177e4 LT |
1170 | goto out; |
1171 | ||
6891a346 BT |
1172 | net->ipv6.ip6_rt_gc_expire++; |
1173 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1174 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1175 | entries = dst_entries_get_slow(ops); |
1176 | if (entries < ops->gc_thresh) | |
7019b78e | 1177 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1178 | out: |
7019b78e | 1179 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1180 | return entries > rt_max_size; |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1184 | but results in cleaner routing tables. | |
1185 | ||
1186 | Remove it only when all the things will work! | |
1187 | */ | |
1188 | ||
6b75d090 | 1189 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1190 | { |
5170ae82 | 1191 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1192 | if (hoplimit == 0) { |
6b75d090 | 1193 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1194 | struct inet6_dev *idev; |
1195 | ||
1196 | rcu_read_lock(); | |
1197 | idev = __in6_dev_get(dev); | |
1198 | if (idev) | |
6b75d090 | 1199 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1200 | else |
53b7997f | 1201 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1202 | rcu_read_unlock(); |
1da177e4 LT |
1203 | } |
1204 | return hoplimit; | |
1205 | } | |
abbf46ae | 1206 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1207 | |
1208 | /* | |
1209 | * | |
1210 | */ | |
1211 | ||
86872cb5 | 1212 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1213 | { |
1214 | int err; | |
5578689a | 1215 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1216 | struct rt6_info *rt = NULL; |
1217 | struct net_device *dev = NULL; | |
1218 | struct inet6_dev *idev = NULL; | |
c71099ac | 1219 | struct fib6_table *table; |
1da177e4 LT |
1220 | int addr_type; |
1221 | ||
86872cb5 | 1222 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1223 | return -EINVAL; |
1224 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1225 | if (cfg->fc_src_len) |
1da177e4 LT |
1226 | return -EINVAL; |
1227 | #endif | |
86872cb5 | 1228 | if (cfg->fc_ifindex) { |
1da177e4 | 1229 | err = -ENODEV; |
5578689a | 1230 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1231 | if (!dev) |
1232 | goto out; | |
1233 | idev = in6_dev_get(dev); | |
1234 | if (!idev) | |
1235 | goto out; | |
1236 | } | |
1237 | ||
86872cb5 TG |
1238 | if (cfg->fc_metric == 0) |
1239 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1240 | |
d71314b4 | 1241 | err = -ENOBUFS; |
38308473 DM |
1242 | if (cfg->fc_nlinfo.nlh && |
1243 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1244 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1245 | if (!table) { |
d71314b4 MV |
1246 | printk(KERN_WARNING "IPv6: NLM_F_CREATE should be specified when creating new route\n"); |
1247 | table = fib6_new_table(net, cfg->fc_table); | |
1248 | } | |
1249 | } else { | |
1250 | table = fib6_new_table(net, cfg->fc_table); | |
1251 | } | |
38308473 DM |
1252 | |
1253 | if (!table) | |
c71099ac | 1254 | goto out; |
c71099ac | 1255 | |
957c665f | 1256 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT); |
1da177e4 | 1257 | |
38308473 | 1258 | if (!rt) { |
1da177e4 LT |
1259 | err = -ENOMEM; |
1260 | goto out; | |
1261 | } | |
1262 | ||
d8d1f30b | 1263 | rt->dst.obsolete = -1; |
6f704992 YH |
1264 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1265 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1266 | 0; | |
1da177e4 | 1267 | |
86872cb5 TG |
1268 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1269 | cfg->fc_protocol = RTPROT_BOOT; | |
1270 | rt->rt6i_protocol = cfg->fc_protocol; | |
1271 | ||
1272 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1273 | |
1274 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1275 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1276 | else if (cfg->fc_flags & RTF_LOCAL) |
1277 | rt->dst.input = ip6_input; | |
1da177e4 | 1278 | else |
d8d1f30b | 1279 | rt->dst.input = ip6_forward; |
1da177e4 | 1280 | |
d8d1f30b | 1281 | rt->dst.output = ip6_output; |
1da177e4 | 1282 | |
86872cb5 TG |
1283 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1284 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1285 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1286 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1287 | |
8e2ec639 YZ |
1288 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1289 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1290 | if (!metrics) { | |
1291 | err = -ENOMEM; | |
1292 | goto out; | |
1293 | } | |
1294 | dst_init_metrics(&rt->dst, metrics, 0); | |
1295 | } | |
1da177e4 | 1296 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1297 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1298 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1299 | #endif |
1300 | ||
86872cb5 | 1301 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1302 | |
1303 | /* We cannot add true routes via loopback here, | |
1304 | they would result in kernel looping; promote them to reject routes | |
1305 | */ | |
86872cb5 | 1306 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1307 | (dev && (dev->flags & IFF_LOOPBACK) && |
1308 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1309 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1310 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1311 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1312 | if (dev) { |
1313 | dev_put(dev); | |
1314 | in6_dev_put(idev); | |
1315 | } | |
5578689a | 1316 | dev = net->loopback_dev; |
1da177e4 LT |
1317 | dev_hold(dev); |
1318 | idev = in6_dev_get(dev); | |
1319 | if (!idev) { | |
1320 | err = -ENODEV; | |
1321 | goto out; | |
1322 | } | |
1323 | } | |
d8d1f30b CG |
1324 | rt->dst.output = ip6_pkt_discard_out; |
1325 | rt->dst.input = ip6_pkt_discard; | |
1326 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1327 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1328 | goto install_route; | |
1329 | } | |
1330 | ||
86872cb5 | 1331 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1332 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1333 | int gwa_type; |
1334 | ||
86872cb5 | 1335 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1336 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1337 | gwa_type = ipv6_addr_type(gw_addr); |
1338 | ||
1339 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1340 | struct rt6_info *grt; | |
1341 | ||
1342 | /* IPv6 strictly inhibits using not link-local | |
1343 | addresses as nexthop address. | |
1344 | Otherwise, router will not able to send redirects. | |
1345 | It is very good, but in some (rare!) circumstances | |
1346 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1347 | some exceptions. --ANK | |
1348 | */ | |
1349 | err = -EINVAL; | |
38308473 | 1350 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1351 | goto out; |
1352 | ||
5578689a | 1353 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1354 | |
1355 | err = -EHOSTUNREACH; | |
38308473 | 1356 | if (!grt) |
1da177e4 LT |
1357 | goto out; |
1358 | if (dev) { | |
1359 | if (dev != grt->rt6i_dev) { | |
d8d1f30b | 1360 | dst_release(&grt->dst); |
1da177e4 LT |
1361 | goto out; |
1362 | } | |
1363 | } else { | |
1364 | dev = grt->rt6i_dev; | |
1365 | idev = grt->rt6i_idev; | |
1366 | dev_hold(dev); | |
1367 | in6_dev_hold(grt->rt6i_idev); | |
1368 | } | |
38308473 | 1369 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1370 | err = 0; |
d8d1f30b | 1371 | dst_release(&grt->dst); |
1da177e4 LT |
1372 | |
1373 | if (err) | |
1374 | goto out; | |
1375 | } | |
1376 | err = -EINVAL; | |
38308473 | 1377 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1378 | goto out; |
1379 | } | |
1380 | ||
1381 | err = -ENODEV; | |
38308473 | 1382 | if (!dev) |
1da177e4 LT |
1383 | goto out; |
1384 | ||
c3968a85 DW |
1385 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1386 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1387 | err = -EINVAL; | |
1388 | goto out; | |
1389 | } | |
4e3fd7a0 | 1390 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1391 | rt->rt6i_prefsrc.plen = 128; |
1392 | } else | |
1393 | rt->rt6i_prefsrc.plen = 0; | |
1394 | ||
86872cb5 | 1395 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
69cce1d1 DM |
1396 | struct neighbour *n = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1397 | if (IS_ERR(n)) { | |
1398 | err = PTR_ERR(n); | |
1da177e4 LT |
1399 | goto out; |
1400 | } | |
69cce1d1 | 1401 | dst_set_neighbour(&rt->dst, n); |
1da177e4 LT |
1402 | } |
1403 | ||
86872cb5 | 1404 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1405 | |
1406 | install_route: | |
86872cb5 TG |
1407 | if (cfg->fc_mx) { |
1408 | struct nlattr *nla; | |
1409 | int remaining; | |
1410 | ||
1411 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1412 | int type = nla_type(nla); |
86872cb5 TG |
1413 | |
1414 | if (type) { | |
1415 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1416 | err = -EINVAL; |
1417 | goto out; | |
1418 | } | |
86872cb5 | 1419 | |
defb3519 | 1420 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1421 | } |
1da177e4 LT |
1422 | } |
1423 | } | |
1424 | ||
d8d1f30b | 1425 | rt->dst.dev = dev; |
1da177e4 | 1426 | rt->rt6i_idev = idev; |
c71099ac | 1427 | rt->rt6i_table = table; |
63152fc0 | 1428 | |
c346dca1 | 1429 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1430 | |
86872cb5 | 1431 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1432 | |
1433 | out: | |
1434 | if (dev) | |
1435 | dev_put(dev); | |
1436 | if (idev) | |
1437 | in6_dev_put(idev); | |
1438 | if (rt) | |
d8d1f30b | 1439 | dst_free(&rt->dst); |
1da177e4 LT |
1440 | return err; |
1441 | } | |
1442 | ||
86872cb5 | 1443 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1444 | { |
1445 | int err; | |
c71099ac | 1446 | struct fib6_table *table; |
c346dca1 | 1447 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1448 | |
8ed67789 | 1449 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1450 | return -ENOENT; |
1451 | ||
c71099ac TG |
1452 | table = rt->rt6i_table; |
1453 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1454 | |
86872cb5 | 1455 | err = fib6_del(rt, info); |
d8d1f30b | 1456 | dst_release(&rt->dst); |
1da177e4 | 1457 | |
c71099ac | 1458 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1459 | |
1460 | return err; | |
1461 | } | |
1462 | ||
e0a1ad73 TG |
1463 | int ip6_del_rt(struct rt6_info *rt) |
1464 | { | |
4d1169c1 | 1465 | struct nl_info info = { |
c346dca1 | 1466 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1467 | }; |
528c4ceb | 1468 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1469 | } |
1470 | ||
86872cb5 | 1471 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1472 | { |
c71099ac | 1473 | struct fib6_table *table; |
1da177e4 LT |
1474 | struct fib6_node *fn; |
1475 | struct rt6_info *rt; | |
1476 | int err = -ESRCH; | |
1477 | ||
5578689a | 1478 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1479 | if (!table) |
c71099ac TG |
1480 | return err; |
1481 | ||
1482 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1483 | |
c71099ac | 1484 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1485 | &cfg->fc_dst, cfg->fc_dst_len, |
1486 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1487 | |
1da177e4 | 1488 | if (fn) { |
d8d1f30b | 1489 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1490 | if (cfg->fc_ifindex && |
38308473 | 1491 | (!rt->rt6i_dev || |
86872cb5 | 1492 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1493 | continue; |
86872cb5 TG |
1494 | if (cfg->fc_flags & RTF_GATEWAY && |
1495 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1496 | continue; |
86872cb5 | 1497 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1498 | continue; |
d8d1f30b | 1499 | dst_hold(&rt->dst); |
c71099ac | 1500 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1501 | |
86872cb5 | 1502 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1503 | } |
1504 | } | |
c71099ac | 1505 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1506 | |
1507 | return err; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * Handle redirects | |
1512 | */ | |
a6279458 | 1513 | struct ip6rd_flowi { |
4c9483b2 | 1514 | struct flowi6 fl6; |
a6279458 YH |
1515 | struct in6_addr gateway; |
1516 | }; | |
1517 | ||
8ed67789 DL |
1518 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1519 | struct fib6_table *table, | |
4c9483b2 | 1520 | struct flowi6 *fl6, |
a6279458 | 1521 | int flags) |
1da177e4 | 1522 | { |
4c9483b2 | 1523 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
a6279458 | 1524 | struct rt6_info *rt; |
e843b9e1 | 1525 | struct fib6_node *fn; |
c71099ac | 1526 | |
1da177e4 | 1527 | /* |
e843b9e1 YH |
1528 | * Get the "current" route for this destination and |
1529 | * check if the redirect has come from approriate router. | |
1530 | * | |
1531 | * RFC 2461 specifies that redirects should only be | |
1532 | * accepted if they come from the nexthop to the target. | |
1533 | * Due to the way the routes are chosen, this notion | |
1534 | * is a bit fuzzy and one might need to check all possible | |
1535 | * routes. | |
1da177e4 | 1536 | */ |
1da177e4 | 1537 | |
c71099ac | 1538 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 1539 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
e843b9e1 | 1540 | restart: |
d8d1f30b | 1541 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1542 | /* |
1543 | * Current route is on-link; redirect is always invalid. | |
1544 | * | |
1545 | * Seems, previous statement is not true. It could | |
1546 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1547 | * But then router serving it might decide, that we should | |
1548 | * know truth 8)8) --ANK (980726). | |
1549 | */ | |
1550 | if (rt6_check_expired(rt)) | |
1551 | continue; | |
1552 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1553 | continue; | |
4c9483b2 | 1554 | if (fl6->flowi6_oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1555 | continue; |
a6279458 | 1556 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1557 | continue; |
1558 | break; | |
1559 | } | |
a6279458 | 1560 | |
cb15d9c2 | 1561 | if (!rt) |
8ed67789 | 1562 | rt = net->ipv6.ip6_null_entry; |
4c9483b2 | 1563 | BACKTRACK(net, &fl6->saddr); |
cb15d9c2 | 1564 | out: |
d8d1f30b | 1565 | dst_hold(&rt->dst); |
a6279458 | 1566 | |
c71099ac | 1567 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1568 | |
a6279458 YH |
1569 | return rt; |
1570 | }; | |
1571 | ||
b71d1d42 ED |
1572 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
1573 | const struct in6_addr *src, | |
1574 | const struct in6_addr *gateway, | |
a6279458 YH |
1575 | struct net_device *dev) |
1576 | { | |
adaa70bb | 1577 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1578 | struct net *net = dev_net(dev); |
a6279458 | 1579 | struct ip6rd_flowi rdfl = { |
4c9483b2 DM |
1580 | .fl6 = { |
1581 | .flowi6_oif = dev->ifindex, | |
1582 | .daddr = *dest, | |
1583 | .saddr = *src, | |
a6279458 | 1584 | }, |
a6279458 | 1585 | }; |
adaa70bb | 1586 | |
4e3fd7a0 | 1587 | rdfl.gateway = *gateway; |
86c36ce4 | 1588 | |
adaa70bb TG |
1589 | if (rt6_need_strict(dest)) |
1590 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1591 | |
4c9483b2 | 1592 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
58f09b78 | 1593 | flags, __ip6_route_redirect); |
a6279458 YH |
1594 | } |
1595 | ||
b71d1d42 ED |
1596 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
1597 | const struct in6_addr *saddr, | |
a6279458 YH |
1598 | struct neighbour *neigh, u8 *lladdr, int on_link) |
1599 | { | |
1600 | struct rt6_info *rt, *nrt = NULL; | |
1601 | struct netevent_redirect netevent; | |
c346dca1 | 1602 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1603 | |
1604 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1605 | ||
8ed67789 | 1606 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1607 | if (net_ratelimit()) |
1608 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1609 | "for redirect target\n"); | |
a6279458 | 1610 | goto out; |
1da177e4 LT |
1611 | } |
1612 | ||
1da177e4 LT |
1613 | /* |
1614 | * We have finally decided to accept it. | |
1615 | */ | |
1616 | ||
1ab1457c | 1617 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1618 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1619 | NEIGH_UPDATE_F_OVERRIDE| | |
1620 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1621 | NEIGH_UPDATE_F_ISROUTER)) | |
1622 | ); | |
1623 | ||
1624 | /* | |
1625 | * Redirect received -> path was valid. | |
1626 | * Look, redirects are sent only in response to data packets, | |
1627 | * so that this nexthop apparently is reachable. --ANK | |
1628 | */ | |
d8d1f30b | 1629 | dst_confirm(&rt->dst); |
1da177e4 LT |
1630 | |
1631 | /* Duplicate redirect: silently ignore. */ | |
27217455 | 1632 | if (neigh == dst_get_neighbour_noref_raw(&rt->dst)) |
1da177e4 LT |
1633 | goto out; |
1634 | ||
21efcfa0 | 1635 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1636 | if (!nrt) |
1da177e4 LT |
1637 | goto out; |
1638 | ||
1639 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1640 | if (on_link) | |
1641 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1642 | ||
4e3fd7a0 | 1643 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
69cce1d1 | 1644 | dst_set_neighbour(&nrt->dst, neigh_clone(neigh)); |
1da177e4 | 1645 | |
40e22e8f | 1646 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1647 | goto out; |
1648 | ||
d8d1f30b CG |
1649 | netevent.old = &rt->dst; |
1650 | netevent.new = &nrt->dst; | |
8d71740c TT |
1651 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1652 | ||
38308473 | 1653 | if (rt->rt6i_flags & RTF_CACHE) { |
e0a1ad73 | 1654 | ip6_del_rt(rt); |
1da177e4 LT |
1655 | return; |
1656 | } | |
1657 | ||
1658 | out: | |
d8d1f30b | 1659 | dst_release(&rt->dst); |
1da177e4 LT |
1660 | } |
1661 | ||
1662 | /* | |
1663 | * Handle ICMP "packet too big" messages | |
1664 | * i.e. Path MTU discovery | |
1665 | */ | |
1666 | ||
b71d1d42 | 1667 | static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 | 1668 | struct net *net, u32 pmtu, int ifindex) |
1da177e4 LT |
1669 | { |
1670 | struct rt6_info *rt, *nrt; | |
1671 | int allfrag = 0; | |
d3052b55 | 1672 | again: |
ae878ae2 | 1673 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
38308473 | 1674 | if (!rt) |
1da177e4 LT |
1675 | return; |
1676 | ||
d3052b55 AV |
1677 | if (rt6_check_expired(rt)) { |
1678 | ip6_del_rt(rt); | |
1679 | goto again; | |
1680 | } | |
1681 | ||
d8d1f30b | 1682 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1683 | goto out; |
1684 | ||
1685 | if (pmtu < IPV6_MIN_MTU) { | |
1686 | /* | |
1ab1457c | 1687 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1688 | * MTU (1280) and a fragment header should always be included |
1689 | * after a node receiving Too Big message reporting PMTU is | |
1690 | * less than the IPv6 Minimum Link MTU. | |
1691 | */ | |
1692 | pmtu = IPV6_MIN_MTU; | |
1693 | allfrag = 1; | |
1694 | } | |
1695 | ||
1696 | /* New mtu received -> path was valid. | |
1697 | They are sent only in response to data packets, | |
1698 | so that this nexthop apparently is reachable. --ANK | |
1699 | */ | |
d8d1f30b | 1700 | dst_confirm(&rt->dst); |
1da177e4 LT |
1701 | |
1702 | /* Host route. If it is static, it would be better | |
1703 | not to override it, but add new one, so that | |
1704 | when cache entry will expire old pmtu | |
1705 | would return automatically. | |
1706 | */ | |
1707 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1708 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1709 | if (allfrag) { | |
1710 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1711 | features |= RTAX_FEATURE_ALLFRAG; | |
1712 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1713 | } | |
d8d1f30b | 1714 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1715 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1716 | goto out; | |
1717 | } | |
1718 | ||
1719 | /* Network route. | |
1720 | Two cases are possible: | |
1721 | 1. It is connected route. Action: COW | |
1722 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1723 | */ | |
27217455 | 1724 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1725 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1726 | else |
1727 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1728 | |
d5315b50 | 1729 | if (nrt) { |
defb3519 DM |
1730 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1731 | if (allfrag) { | |
1732 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1733 | features |= RTAX_FEATURE_ALLFRAG; | |
1734 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1735 | } | |
a1e78363 YH |
1736 | |
1737 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1738 | * happened within 5 mins, the recommended timer is 10 mins. | |
1739 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1740 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1741 | * and detecting PMTU increase will be automatically happened. | |
1742 | */ | |
d8d1f30b | 1743 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1744 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1745 | ||
40e22e8f | 1746 | ip6_ins_rt(nrt); |
1da177e4 | 1747 | } |
1da177e4 | 1748 | out: |
d8d1f30b | 1749 | dst_release(&rt->dst); |
1da177e4 LT |
1750 | } |
1751 | ||
b71d1d42 | 1752 | void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 MŻ |
1753 | struct net_device *dev, u32 pmtu) |
1754 | { | |
1755 | struct net *net = dev_net(dev); | |
1756 | ||
1757 | /* | |
1758 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1759 | * is sending along the path" that caused the Packet Too Big message. | |
1760 | * Since it's not possible in the general case to determine which | |
1761 | * interface was used to send the original packet, we update the MTU | |
1762 | * on the interface that will be used to send future packets. We also | |
1763 | * update the MTU on the interface that received the Packet Too Big in | |
1764 | * case the original packet was forced out that interface with | |
1765 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1766 | * correct behaviour, which would be to update the MTU on all | |
1767 | * interfaces. | |
1768 | */ | |
1769 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1770 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1771 | } | |
1772 | ||
1da177e4 LT |
1773 | /* |
1774 | * Misc support functions | |
1775 | */ | |
1776 | ||
21efcfa0 ED |
1777 | static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort, |
1778 | const struct in6_addr *dest) | |
1da177e4 | 1779 | { |
c346dca1 | 1780 | struct net *net = dev_net(ort->rt6i_dev); |
5c1e6aa3 | 1781 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 1782 | ort->dst.dev, 0); |
1da177e4 LT |
1783 | |
1784 | if (rt) { | |
d8d1f30b CG |
1785 | rt->dst.input = ort->dst.input; |
1786 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1787 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1788 | |
4e3fd7a0 | 1789 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1790 | rt->rt6i_dst.plen = 128; |
defb3519 | 1791 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1792 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1793 | rt->rt6i_idev = ort->rt6i_idev; |
1794 | if (rt->rt6i_idev) | |
1795 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1796 | rt->dst.lastuse = jiffies; |
1da177e4 LT |
1797 | rt->rt6i_expires = 0; |
1798 | ||
4e3fd7a0 | 1799 | rt->rt6i_gateway = ort->rt6i_gateway; |
1da177e4 LT |
1800 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
1801 | rt->rt6i_metric = 0; | |
1802 | ||
1da177e4 LT |
1803 | #ifdef CONFIG_IPV6_SUBTREES |
1804 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1805 | #endif | |
0f6c6392 | 1806 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1807 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1808 | } |
1809 | return rt; | |
1810 | } | |
1811 | ||
70ceb4f5 | 1812 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1813 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1814 | const struct in6_addr *prefix, int prefixlen, |
1815 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1816 | { |
1817 | struct fib6_node *fn; | |
1818 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1819 | struct fib6_table *table; |
1820 | ||
efa2cea0 | 1821 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1822 | if (!table) |
c71099ac | 1823 | return NULL; |
70ceb4f5 | 1824 | |
c71099ac TG |
1825 | write_lock_bh(&table->tb6_lock); |
1826 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1827 | if (!fn) |
1828 | goto out; | |
1829 | ||
d8d1f30b | 1830 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
70ceb4f5 YH |
1831 | if (rt->rt6i_dev->ifindex != ifindex) |
1832 | continue; | |
1833 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1834 | continue; | |
1835 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1836 | continue; | |
d8d1f30b | 1837 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1838 | break; |
1839 | } | |
1840 | out: | |
c71099ac | 1841 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1842 | return rt; |
1843 | } | |
1844 | ||
efa2cea0 | 1845 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1846 | const struct in6_addr *prefix, int prefixlen, |
1847 | const struct in6_addr *gwaddr, int ifindex, | |
70ceb4f5 YH |
1848 | unsigned pref) |
1849 | { | |
86872cb5 TG |
1850 | struct fib6_config cfg = { |
1851 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1852 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1853 | .fc_ifindex = ifindex, |
1854 | .fc_dst_len = prefixlen, | |
1855 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1856 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1857 | .fc_nlinfo.pid = 0, |
1858 | .fc_nlinfo.nlh = NULL, | |
1859 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1860 | }; |
1861 | ||
4e3fd7a0 AD |
1862 | cfg.fc_dst = *prefix; |
1863 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1864 | |
e317da96 YH |
1865 | /* We should treat it as a default route if prefix length is 0. */ |
1866 | if (!prefixlen) | |
86872cb5 | 1867 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1868 | |
86872cb5 | 1869 | ip6_route_add(&cfg); |
70ceb4f5 | 1870 | |
efa2cea0 | 1871 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1872 | } |
1873 | #endif | |
1874 | ||
b71d1d42 | 1875 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1876 | { |
1da177e4 | 1877 | struct rt6_info *rt; |
c71099ac | 1878 | struct fib6_table *table; |
1da177e4 | 1879 | |
c346dca1 | 1880 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1881 | if (!table) |
c71099ac | 1882 | return NULL; |
1da177e4 | 1883 | |
c71099ac | 1884 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1885 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
1da177e4 | 1886 | if (dev == rt->rt6i_dev && |
045927ff | 1887 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1888 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1889 | break; | |
1890 | } | |
1891 | if (rt) | |
d8d1f30b | 1892 | dst_hold(&rt->dst); |
c71099ac | 1893 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1894 | return rt; |
1895 | } | |
1896 | ||
b71d1d42 | 1897 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1898 | struct net_device *dev, |
1899 | unsigned int pref) | |
1da177e4 | 1900 | { |
86872cb5 TG |
1901 | struct fib6_config cfg = { |
1902 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1903 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1904 | .fc_ifindex = dev->ifindex, |
1905 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1906 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1907 | .fc_nlinfo.pid = 0, |
1908 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1909 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1910 | }; |
1da177e4 | 1911 | |
4e3fd7a0 | 1912 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1913 | |
86872cb5 | 1914 | ip6_route_add(&cfg); |
1da177e4 | 1915 | |
1da177e4 LT |
1916 | return rt6_get_dflt_router(gwaddr, dev); |
1917 | } | |
1918 | ||
7b4da532 | 1919 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1920 | { |
1921 | struct rt6_info *rt; | |
c71099ac TG |
1922 | struct fib6_table *table; |
1923 | ||
1924 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1925 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1926 | if (!table) |
c71099ac | 1927 | return; |
1da177e4 LT |
1928 | |
1929 | restart: | |
c71099ac | 1930 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1931 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1932 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1933 | dst_hold(&rt->dst); |
c71099ac | 1934 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1935 | ip6_del_rt(rt); |
1da177e4 LT |
1936 | goto restart; |
1937 | } | |
1938 | } | |
c71099ac | 1939 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1940 | } |
1941 | ||
5578689a DL |
1942 | static void rtmsg_to_fib6_config(struct net *net, |
1943 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1944 | struct fib6_config *cfg) |
1945 | { | |
1946 | memset(cfg, 0, sizeof(*cfg)); | |
1947 | ||
1948 | cfg->fc_table = RT6_TABLE_MAIN; | |
1949 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1950 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1951 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1952 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1953 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1954 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1955 | ||
5578689a | 1956 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1957 | |
4e3fd7a0 AD |
1958 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1959 | cfg->fc_src = rtmsg->rtmsg_src; | |
1960 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1961 | } |
1962 | ||
5578689a | 1963 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1964 | { |
86872cb5 | 1965 | struct fib6_config cfg; |
1da177e4 LT |
1966 | struct in6_rtmsg rtmsg; |
1967 | int err; | |
1968 | ||
1969 | switch(cmd) { | |
1970 | case SIOCADDRT: /* Add a route */ | |
1971 | case SIOCDELRT: /* Delete a route */ | |
1972 | if (!capable(CAP_NET_ADMIN)) | |
1973 | return -EPERM; | |
1974 | err = copy_from_user(&rtmsg, arg, | |
1975 | sizeof(struct in6_rtmsg)); | |
1976 | if (err) | |
1977 | return -EFAULT; | |
86872cb5 | 1978 | |
5578689a | 1979 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1980 | |
1da177e4 LT |
1981 | rtnl_lock(); |
1982 | switch (cmd) { | |
1983 | case SIOCADDRT: | |
86872cb5 | 1984 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1985 | break; |
1986 | case SIOCDELRT: | |
86872cb5 | 1987 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1988 | break; |
1989 | default: | |
1990 | err = -EINVAL; | |
1991 | } | |
1992 | rtnl_unlock(); | |
1993 | ||
1994 | return err; | |
3ff50b79 | 1995 | } |
1da177e4 LT |
1996 | |
1997 | return -EINVAL; | |
1998 | } | |
1999 | ||
2000 | /* | |
2001 | * Drop the packet on the floor | |
2002 | */ | |
2003 | ||
d5fdd6ba | 2004 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2005 | { |
612f09e8 | 2006 | int type; |
adf30907 | 2007 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2008 | switch (ipstats_mib_noroutes) { |
2009 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2010 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2011 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2012 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2013 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2014 | break; |
2015 | } | |
2016 | /* FALLTHROUGH */ | |
2017 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2018 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2019 | ipstats_mib_noroutes); | |
612f09e8 YH |
2020 | break; |
2021 | } | |
3ffe533c | 2022 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2023 | kfree_skb(skb); |
2024 | return 0; | |
2025 | } | |
2026 | ||
9ce8ade0 TG |
2027 | static int ip6_pkt_discard(struct sk_buff *skb) |
2028 | { | |
612f09e8 | 2029 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2030 | } |
2031 | ||
20380731 | 2032 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2033 | { |
adf30907 | 2034 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2035 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2036 | } |
2037 | ||
6723ab54 DM |
2038 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2039 | ||
9ce8ade0 TG |
2040 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2041 | { | |
612f09e8 | 2042 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2043 | } |
2044 | ||
2045 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2046 | { | |
adf30907 | 2047 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2048 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2049 | } |
2050 | ||
6723ab54 DM |
2051 | #endif |
2052 | ||
1da177e4 LT |
2053 | /* |
2054 | * Allocate a dst for local (unicast / anycast) address. | |
2055 | */ | |
2056 | ||
2057 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2058 | const struct in6_addr *addr, | |
2059 | int anycast) | |
2060 | { | |
c346dca1 | 2061 | struct net *net = dev_net(idev->dev); |
5c1e6aa3 | 2062 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 2063 | net->loopback_dev, 0); |
14deae41 | 2064 | struct neighbour *neigh; |
1da177e4 | 2065 | |
38308473 | 2066 | if (!rt) { |
40385653 BG |
2067 | if (net_ratelimit()) |
2068 | pr_warning("IPv6: Maximum number of routes reached," | |
2069 | " consider increasing route/max_size.\n"); | |
1da177e4 | 2070 | return ERR_PTR(-ENOMEM); |
40385653 | 2071 | } |
1da177e4 | 2072 | |
1da177e4 LT |
2073 | in6_dev_hold(idev); |
2074 | ||
11d53b49 | 2075 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2076 | rt->dst.input = ip6_input; |
2077 | rt->dst.output = ip6_output; | |
1da177e4 | 2078 | rt->rt6i_idev = idev; |
d8d1f30b | 2079 | rt->dst.obsolete = -1; |
1da177e4 LT |
2080 | |
2081 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2082 | if (anycast) |
2083 | rt->rt6i_flags |= RTF_ANYCAST; | |
2084 | else | |
1da177e4 | 2085 | rt->rt6i_flags |= RTF_LOCAL; |
04a6f441 | 2086 | neigh = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, rt->rt6i_dev); |
14deae41 | 2087 | if (IS_ERR(neigh)) { |
d8d1f30b | 2088 | dst_free(&rt->dst); |
14deae41 | 2089 | |
29546a64 | 2090 | return ERR_CAST(neigh); |
1da177e4 | 2091 | } |
69cce1d1 | 2092 | dst_set_neighbour(&rt->dst, neigh); |
1da177e4 | 2093 | |
4e3fd7a0 | 2094 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2095 | rt->rt6i_dst.plen = 128; |
5578689a | 2096 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2097 | |
d8d1f30b | 2098 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2099 | |
2100 | return rt; | |
2101 | } | |
2102 | ||
c3968a85 DW |
2103 | int ip6_route_get_saddr(struct net *net, |
2104 | struct rt6_info *rt, | |
b71d1d42 | 2105 | const struct in6_addr *daddr, |
c3968a85 DW |
2106 | unsigned int prefs, |
2107 | struct in6_addr *saddr) | |
2108 | { | |
2109 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2110 | int err = 0; | |
2111 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2112 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2113 | else |
2114 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2115 | daddr, prefs, saddr); | |
2116 | return err; | |
2117 | } | |
2118 | ||
2119 | /* remove deleted ip from prefsrc entries */ | |
2120 | struct arg_dev_net_ip { | |
2121 | struct net_device *dev; | |
2122 | struct net *net; | |
2123 | struct in6_addr *addr; | |
2124 | }; | |
2125 | ||
2126 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2127 | { | |
2128 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2129 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2130 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2131 | ||
38308473 | 2132 | if (((void *)rt->rt6i_dev == dev || !dev) && |
c3968a85 DW |
2133 | rt != net->ipv6.ip6_null_entry && |
2134 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2135 | /* remove prefsrc entry */ | |
2136 | rt->rt6i_prefsrc.plen = 0; | |
2137 | } | |
2138 | return 0; | |
2139 | } | |
2140 | ||
2141 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2142 | { | |
2143 | struct net *net = dev_net(ifp->idev->dev); | |
2144 | struct arg_dev_net_ip adni = { | |
2145 | .dev = ifp->idev->dev, | |
2146 | .net = net, | |
2147 | .addr = &ifp->addr, | |
2148 | }; | |
2149 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2150 | } | |
2151 | ||
8ed67789 DL |
2152 | struct arg_dev_net { |
2153 | struct net_device *dev; | |
2154 | struct net *net; | |
2155 | }; | |
2156 | ||
1da177e4 LT |
2157 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2158 | { | |
bc3ef660 | 2159 | const struct arg_dev_net *adn = arg; |
2160 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2161 | |
38308473 | 2162 | if ((rt->rt6i_dev == dev || !dev) && |
bc3ef660 | 2163 | rt != adn->net->ipv6.ip6_null_entry) { |
1da177e4 LT |
2164 | RT6_TRACE("deleted by ifdown %p\n", rt); |
2165 | return -1; | |
2166 | } | |
2167 | return 0; | |
2168 | } | |
2169 | ||
f3db4851 | 2170 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2171 | { |
8ed67789 DL |
2172 | struct arg_dev_net adn = { |
2173 | .dev = dev, | |
2174 | .net = net, | |
2175 | }; | |
2176 | ||
2177 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2178 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2179 | } |
2180 | ||
2181 | struct rt6_mtu_change_arg | |
2182 | { | |
2183 | struct net_device *dev; | |
2184 | unsigned mtu; | |
2185 | }; | |
2186 | ||
2187 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2188 | { | |
2189 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2190 | struct inet6_dev *idev; | |
2191 | ||
2192 | /* In IPv6 pmtu discovery is not optional, | |
2193 | so that RTAX_MTU lock cannot disable it. | |
2194 | We still use this lock to block changes | |
2195 | caused by addrconf/ndisc. | |
2196 | */ | |
2197 | ||
2198 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2199 | if (!idev) |
1da177e4 LT |
2200 | return 0; |
2201 | ||
2202 | /* For administrative MTU increase, there is no way to discover | |
2203 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2204 | Since RFC 1981 doesn't include administrative MTU increase | |
2205 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2206 | */ | |
2207 | /* | |
2208 | If new MTU is less than route PMTU, this new MTU will be the | |
2209 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2210 | decreases; if new MTU is greater than route PMTU, and the | |
2211 | old MTU is the lowest MTU in the path, update the route PMTU | |
2212 | to reflect the increase. In this case if the other nodes' MTU | |
2213 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2214 | PMTU discouvery. | |
2215 | */ | |
2216 | if (rt->rt6i_dev == arg->dev && | |
d8d1f30b CG |
2217 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2218 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2219 | (dst_mtu(&rt->dst) < arg->mtu && | |
2220 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2221 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2222 | } |
1da177e4 LT |
2223 | return 0; |
2224 | } | |
2225 | ||
2226 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2227 | { | |
c71099ac TG |
2228 | struct rt6_mtu_change_arg arg = { |
2229 | .dev = dev, | |
2230 | .mtu = mtu, | |
2231 | }; | |
1da177e4 | 2232 | |
c346dca1 | 2233 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2234 | } |
2235 | ||
ef7c79ed | 2236 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2237 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2238 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2239 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2240 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2241 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2242 | }; | |
2243 | ||
2244 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2245 | struct fib6_config *cfg) | |
1da177e4 | 2246 | { |
86872cb5 TG |
2247 | struct rtmsg *rtm; |
2248 | struct nlattr *tb[RTA_MAX+1]; | |
2249 | int err; | |
1da177e4 | 2250 | |
86872cb5 TG |
2251 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2252 | if (err < 0) | |
2253 | goto errout; | |
1da177e4 | 2254 | |
86872cb5 TG |
2255 | err = -EINVAL; |
2256 | rtm = nlmsg_data(nlh); | |
2257 | memset(cfg, 0, sizeof(*cfg)); | |
2258 | ||
2259 | cfg->fc_table = rtm->rtm_table; | |
2260 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2261 | cfg->fc_src_len = rtm->rtm_src_len; | |
2262 | cfg->fc_flags = RTF_UP; | |
2263 | cfg->fc_protocol = rtm->rtm_protocol; | |
2264 | ||
2265 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2266 | cfg->fc_flags |= RTF_REJECT; | |
2267 | ||
ab79ad14 MŻ |
2268 | if (rtm->rtm_type == RTN_LOCAL) |
2269 | cfg->fc_flags |= RTF_LOCAL; | |
2270 | ||
86872cb5 TG |
2271 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2272 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2273 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2274 | |
2275 | if (tb[RTA_GATEWAY]) { | |
2276 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2277 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2278 | } |
86872cb5 TG |
2279 | |
2280 | if (tb[RTA_DST]) { | |
2281 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2282 | ||
2283 | if (nla_len(tb[RTA_DST]) < plen) | |
2284 | goto errout; | |
2285 | ||
2286 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2287 | } |
86872cb5 TG |
2288 | |
2289 | if (tb[RTA_SRC]) { | |
2290 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2291 | ||
2292 | if (nla_len(tb[RTA_SRC]) < plen) | |
2293 | goto errout; | |
2294 | ||
2295 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2296 | } |
86872cb5 | 2297 | |
c3968a85 DW |
2298 | if (tb[RTA_PREFSRC]) |
2299 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2300 | ||
86872cb5 TG |
2301 | if (tb[RTA_OIF]) |
2302 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2303 | ||
2304 | if (tb[RTA_PRIORITY]) | |
2305 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2306 | ||
2307 | if (tb[RTA_METRICS]) { | |
2308 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2309 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2310 | } |
86872cb5 TG |
2311 | |
2312 | if (tb[RTA_TABLE]) | |
2313 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2314 | ||
2315 | err = 0; | |
2316 | errout: | |
2317 | return err; | |
1da177e4 LT |
2318 | } |
2319 | ||
c127ea2c | 2320 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2321 | { |
86872cb5 TG |
2322 | struct fib6_config cfg; |
2323 | int err; | |
1da177e4 | 2324 | |
86872cb5 TG |
2325 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2326 | if (err < 0) | |
2327 | return err; | |
2328 | ||
2329 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2330 | } |
2331 | ||
c127ea2c | 2332 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2333 | { |
86872cb5 TG |
2334 | struct fib6_config cfg; |
2335 | int err; | |
1da177e4 | 2336 | |
86872cb5 TG |
2337 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2338 | if (err < 0) | |
2339 | return err; | |
2340 | ||
2341 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2342 | } |
2343 | ||
339bf98f TG |
2344 | static inline size_t rt6_nlmsg_size(void) |
2345 | { | |
2346 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2347 | + nla_total_size(16) /* RTA_SRC */ | |
2348 | + nla_total_size(16) /* RTA_DST */ | |
2349 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2350 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2351 | + nla_total_size(4) /* RTA_TABLE */ | |
2352 | + nla_total_size(4) /* RTA_IIF */ | |
2353 | + nla_total_size(4) /* RTA_OIF */ | |
2354 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2355 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2356 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2357 | } | |
2358 | ||
191cd582 BH |
2359 | static int rt6_fill_node(struct net *net, |
2360 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2361 | struct in6_addr *dst, struct in6_addr *src, |
2362 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2363 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2364 | { |
2365 | struct rtmsg *rtm; | |
2d7202bf | 2366 | struct nlmsghdr *nlh; |
e3703b3d | 2367 | long expires; |
9e762a4a | 2368 | u32 table; |
f2c31e32 | 2369 | struct neighbour *n; |
1da177e4 LT |
2370 | |
2371 | if (prefix) { /* user wants prefix routes only */ | |
2372 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2373 | /* success since this is not a prefix route */ | |
2374 | return 1; | |
2375 | } | |
2376 | } | |
2377 | ||
2d7202bf | 2378 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
38308473 | 2379 | if (!nlh) |
26932566 | 2380 | return -EMSGSIZE; |
2d7202bf TG |
2381 | |
2382 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2383 | rtm->rtm_family = AF_INET6; |
2384 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2385 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2386 | rtm->rtm_tos = 0; | |
c71099ac | 2387 | if (rt->rt6i_table) |
9e762a4a | 2388 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2389 | else |
9e762a4a PM |
2390 | table = RT6_TABLE_UNSPEC; |
2391 | rtm->rtm_table = table; | |
2d7202bf | 2392 | NLA_PUT_U32(skb, RTA_TABLE, table); |
38308473 | 2393 | if (rt->rt6i_flags & RTF_REJECT) |
1da177e4 | 2394 | rtm->rtm_type = RTN_UNREACHABLE; |
38308473 | 2395 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2396 | rtm->rtm_type = RTN_LOCAL; |
38308473 | 2397 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2398 | rtm->rtm_type = RTN_LOCAL; |
2399 | else | |
2400 | rtm->rtm_type = RTN_UNICAST; | |
2401 | rtm->rtm_flags = 0; | |
2402 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2403 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2404 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 LT |
2405 | rtm->rtm_protocol = RTPROT_REDIRECT; |
2406 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2407 | rtm->rtm_protocol = RTPROT_KERNEL; | |
38308473 | 2408 | else if (rt->rt6i_flags & RTF_DEFAULT) |
1da177e4 LT |
2409 | rtm->rtm_protocol = RTPROT_RA; |
2410 | ||
38308473 | 2411 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2412 | rtm->rtm_flags |= RTM_F_CLONED; |
2413 | ||
2414 | if (dst) { | |
2d7202bf | 2415 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2416 | rtm->rtm_dst_len = 128; |
1da177e4 | 2417 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2418 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2419 | #ifdef CONFIG_IPV6_SUBTREES |
2420 | if (src) { | |
2d7202bf | 2421 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2422 | rtm->rtm_src_len = 128; |
1da177e4 | 2423 | } else if (rtm->rtm_src_len) |
2d7202bf | 2424 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2425 | #endif |
7bc570c8 YH |
2426 | if (iif) { |
2427 | #ifdef CONFIG_IPV6_MROUTE | |
2428 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2429 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2430 | if (err <= 0) { |
2431 | if (!nowait) { | |
2432 | if (err == 0) | |
2433 | return 0; | |
2434 | goto nla_put_failure; | |
2435 | } else { | |
2436 | if (err == -EMSGSIZE) | |
2437 | goto nla_put_failure; | |
2438 | } | |
2439 | } | |
2440 | } else | |
2441 | #endif | |
2442 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2443 | } else if (dst) { | |
1da177e4 | 2444 | struct in6_addr saddr_buf; |
c3968a85 | 2445 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0) |
2d7202bf | 2446 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2447 | } |
2d7202bf | 2448 | |
c3968a85 DW |
2449 | if (rt->rt6i_prefsrc.plen) { |
2450 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2451 | saddr_buf = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2452 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
2453 | } | |
2454 | ||
defb3519 | 2455 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2456 | goto nla_put_failure; |
2457 | ||
f2c31e32 | 2458 | rcu_read_lock(); |
27217455 | 2459 | n = dst_get_neighbour_noref(&rt->dst); |
f2c31e32 ED |
2460 | if (n) |
2461 | NLA_PUT(skb, RTA_GATEWAY, 16, &n->primary_key); | |
2462 | rcu_read_unlock(); | |
2d7202bf | 2463 | |
d8d1f30b | 2464 | if (rt->dst.dev) |
2d7202bf TG |
2465 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2466 | ||
2467 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2468 | |
36e3deae YH |
2469 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2470 | expires = 0; | |
2471 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2472 | expires = rt->rt6i_expires - jiffies; | |
2473 | else | |
2474 | expires = INT_MAX; | |
69cdf8f9 | 2475 | |
d8d1f30b CG |
2476 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2477 | expires, rt->dst.error) < 0) | |
e3703b3d | 2478 | goto nla_put_failure; |
2d7202bf TG |
2479 | |
2480 | return nlmsg_end(skb, nlh); | |
2481 | ||
2482 | nla_put_failure: | |
26932566 PM |
2483 | nlmsg_cancel(skb, nlh); |
2484 | return -EMSGSIZE; | |
1da177e4 LT |
2485 | } |
2486 | ||
1b43af54 | 2487 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2488 | { |
2489 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2490 | int prefix; | |
2491 | ||
2d7202bf TG |
2492 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2493 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2494 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2495 | } else | |
2496 | prefix = 0; | |
2497 | ||
191cd582 BH |
2498 | return rt6_fill_node(arg->net, |
2499 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2500 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2501 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2502 | } |
2503 | ||
c127ea2c | 2504 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2505 | { |
3b1e0a65 | 2506 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2507 | struct nlattr *tb[RTA_MAX+1]; |
2508 | struct rt6_info *rt; | |
1da177e4 | 2509 | struct sk_buff *skb; |
ab364a6f | 2510 | struct rtmsg *rtm; |
4c9483b2 | 2511 | struct flowi6 fl6; |
ab364a6f | 2512 | int err, iif = 0; |
1da177e4 | 2513 | |
ab364a6f TG |
2514 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2515 | if (err < 0) | |
2516 | goto errout; | |
1da177e4 | 2517 | |
ab364a6f | 2518 | err = -EINVAL; |
4c9483b2 | 2519 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2520 | |
ab364a6f TG |
2521 | if (tb[RTA_SRC]) { |
2522 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2523 | goto errout; | |
2524 | ||
4e3fd7a0 | 2525 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2526 | } |
2527 | ||
2528 | if (tb[RTA_DST]) { | |
2529 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2530 | goto errout; | |
2531 | ||
4e3fd7a0 | 2532 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2533 | } |
2534 | ||
2535 | if (tb[RTA_IIF]) | |
2536 | iif = nla_get_u32(tb[RTA_IIF]); | |
2537 | ||
2538 | if (tb[RTA_OIF]) | |
4c9483b2 | 2539 | fl6.flowi6_oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2540 | |
2541 | if (iif) { | |
2542 | struct net_device *dev; | |
5578689a | 2543 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2544 | if (!dev) { |
2545 | err = -ENODEV; | |
ab364a6f | 2546 | goto errout; |
1da177e4 LT |
2547 | } |
2548 | } | |
2549 | ||
ab364a6f | 2550 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2551 | if (!skb) { |
ab364a6f TG |
2552 | err = -ENOBUFS; |
2553 | goto errout; | |
2554 | } | |
1da177e4 | 2555 | |
ab364a6f TG |
2556 | /* Reserve room for dummy headers, this skb can pass |
2557 | through good chunk of routing engine. | |
2558 | */ | |
459a98ed | 2559 | skb_reset_mac_header(skb); |
ab364a6f | 2560 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2561 | |
4c9483b2 | 2562 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl6); |
d8d1f30b | 2563 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2564 | |
4c9483b2 | 2565 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2566 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2567 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2568 | if (err < 0) { |
ab364a6f TG |
2569 | kfree_skb(skb); |
2570 | goto errout; | |
1da177e4 LT |
2571 | } |
2572 | ||
5578689a | 2573 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2574 | errout: |
1da177e4 | 2575 | return err; |
1da177e4 LT |
2576 | } |
2577 | ||
86872cb5 | 2578 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2579 | { |
2580 | struct sk_buff *skb; | |
5578689a | 2581 | struct net *net = info->nl_net; |
528c4ceb DL |
2582 | u32 seq; |
2583 | int err; | |
2584 | ||
2585 | err = -ENOBUFS; | |
38308473 | 2586 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2587 | |
339bf98f | 2588 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2589 | if (!skb) |
21713ebc TG |
2590 | goto errout; |
2591 | ||
191cd582 | 2592 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2593 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2594 | if (err < 0) { |
2595 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2596 | WARN_ON(err == -EMSGSIZE); | |
2597 | kfree_skb(skb); | |
2598 | goto errout; | |
2599 | } | |
1ce85fe4 PNA |
2600 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2601 | info->nlh, gfp_any()); | |
2602 | return; | |
21713ebc TG |
2603 | errout: |
2604 | if (err < 0) | |
5578689a | 2605 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2606 | } |
2607 | ||
8ed67789 DL |
2608 | static int ip6_route_dev_notify(struct notifier_block *this, |
2609 | unsigned long event, void *data) | |
2610 | { | |
2611 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2612 | struct net *net = dev_net(dev); |
8ed67789 DL |
2613 | |
2614 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2615 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2616 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2617 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2618 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2619 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2620 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2621 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2622 | #endif | |
2623 | } | |
2624 | ||
2625 | return NOTIFY_OK; | |
2626 | } | |
2627 | ||
1da177e4 LT |
2628 | /* |
2629 | * /proc | |
2630 | */ | |
2631 | ||
2632 | #ifdef CONFIG_PROC_FS | |
2633 | ||
1da177e4 LT |
2634 | struct rt6_proc_arg |
2635 | { | |
2636 | char *buffer; | |
2637 | int offset; | |
2638 | int length; | |
2639 | int skip; | |
2640 | int len; | |
2641 | }; | |
2642 | ||
2643 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2644 | { | |
33120b30 | 2645 | struct seq_file *m = p_arg; |
69cce1d1 | 2646 | struct neighbour *n; |
1da177e4 | 2647 | |
4b7a4274 | 2648 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2649 | |
2650 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2651 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2652 | #else |
33120b30 | 2653 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2654 | #endif |
f2c31e32 | 2655 | rcu_read_lock(); |
27217455 | 2656 | n = dst_get_neighbour_noref(&rt->dst); |
69cce1d1 DM |
2657 | if (n) { |
2658 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2659 | } else { |
33120b30 | 2660 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2661 | } |
f2c31e32 | 2662 | rcu_read_unlock(); |
33120b30 | 2663 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2664 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2665 | rt->dst.__use, rt->rt6i_flags, | |
33120b30 | 2666 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
1da177e4 LT |
2667 | return 0; |
2668 | } | |
2669 | ||
33120b30 | 2670 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2671 | { |
f3db4851 DL |
2672 | struct net *net = (struct net *)m->private; |
2673 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2674 | return 0; |
2675 | } | |
1da177e4 | 2676 | |
33120b30 AD |
2677 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2678 | { | |
de05c557 | 2679 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2680 | } |
2681 | ||
33120b30 AD |
2682 | static const struct file_operations ipv6_route_proc_fops = { |
2683 | .owner = THIS_MODULE, | |
2684 | .open = ipv6_route_open, | |
2685 | .read = seq_read, | |
2686 | .llseek = seq_lseek, | |
b6fcbdb4 | 2687 | .release = single_release_net, |
33120b30 AD |
2688 | }; |
2689 | ||
1da177e4 LT |
2690 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2691 | { | |
69ddb805 | 2692 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2693 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2694 | net->ipv6.rt6_stats->fib_nodes, |
2695 | net->ipv6.rt6_stats->fib_route_nodes, | |
2696 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2697 | net->ipv6.rt6_stats->fib_rt_entries, | |
2698 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2699 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2700 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2701 | |
2702 | return 0; | |
2703 | } | |
2704 | ||
2705 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2706 | { | |
de05c557 | 2707 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2708 | } |
2709 | ||
9a32144e | 2710 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2711 | .owner = THIS_MODULE, |
2712 | .open = rt6_stats_seq_open, | |
2713 | .read = seq_read, | |
2714 | .llseek = seq_lseek, | |
b6fcbdb4 | 2715 | .release = single_release_net, |
1da177e4 LT |
2716 | }; |
2717 | #endif /* CONFIG_PROC_FS */ | |
2718 | ||
2719 | #ifdef CONFIG_SYSCTL | |
2720 | ||
1da177e4 | 2721 | static |
8d65af78 | 2722 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2723 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2724 | { | |
c486da34 LAG |
2725 | struct net *net; |
2726 | int delay; | |
2727 | if (!write) | |
1da177e4 | 2728 | return -EINVAL; |
c486da34 LAG |
2729 | |
2730 | net = (struct net *)ctl->extra1; | |
2731 | delay = net->ipv6.sysctl.flush_delay; | |
2732 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2733 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2734 | return 0; | |
1da177e4 LT |
2735 | } |
2736 | ||
760f2d01 | 2737 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2738 | { |
1da177e4 | 2739 | .procname = "flush", |
4990509f | 2740 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2741 | .maxlen = sizeof(int), |
89c8b3a1 | 2742 | .mode = 0200, |
6d9f239a | 2743 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2744 | }, |
2745 | { | |
1da177e4 | 2746 | .procname = "gc_thresh", |
9a7ec3a9 | 2747 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2748 | .maxlen = sizeof(int), |
2749 | .mode = 0644, | |
6d9f239a | 2750 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2751 | }, |
2752 | { | |
1da177e4 | 2753 | .procname = "max_size", |
4990509f | 2754 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2755 | .maxlen = sizeof(int), |
2756 | .mode = 0644, | |
6d9f239a | 2757 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2758 | }, |
2759 | { | |
1da177e4 | 2760 | .procname = "gc_min_interval", |
4990509f | 2761 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2762 | .maxlen = sizeof(int), |
2763 | .mode = 0644, | |
6d9f239a | 2764 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2765 | }, |
2766 | { | |
1da177e4 | 2767 | .procname = "gc_timeout", |
4990509f | 2768 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2769 | .maxlen = sizeof(int), |
2770 | .mode = 0644, | |
6d9f239a | 2771 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2772 | }, |
2773 | { | |
1da177e4 | 2774 | .procname = "gc_interval", |
4990509f | 2775 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2776 | .maxlen = sizeof(int), |
2777 | .mode = 0644, | |
6d9f239a | 2778 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2779 | }, |
2780 | { | |
1da177e4 | 2781 | .procname = "gc_elasticity", |
4990509f | 2782 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2783 | .maxlen = sizeof(int), |
2784 | .mode = 0644, | |
f3d3f616 | 2785 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2786 | }, |
2787 | { | |
1da177e4 | 2788 | .procname = "mtu_expires", |
4990509f | 2789 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2790 | .maxlen = sizeof(int), |
2791 | .mode = 0644, | |
6d9f239a | 2792 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2793 | }, |
2794 | { | |
1da177e4 | 2795 | .procname = "min_adv_mss", |
4990509f | 2796 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2797 | .maxlen = sizeof(int), |
2798 | .mode = 0644, | |
f3d3f616 | 2799 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2800 | }, |
2801 | { | |
1da177e4 | 2802 | .procname = "gc_min_interval_ms", |
4990509f | 2803 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2804 | .maxlen = sizeof(int), |
2805 | .mode = 0644, | |
6d9f239a | 2806 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2807 | }, |
f8572d8f | 2808 | { } |
1da177e4 LT |
2809 | }; |
2810 | ||
2c8c1e72 | 2811 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2812 | { |
2813 | struct ctl_table *table; | |
2814 | ||
2815 | table = kmemdup(ipv6_route_table_template, | |
2816 | sizeof(ipv6_route_table_template), | |
2817 | GFP_KERNEL); | |
5ee09105 YH |
2818 | |
2819 | if (table) { | |
2820 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2821 | table[0].extra1 = net; |
86393e52 | 2822 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2823 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2824 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2825 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2826 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2827 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2828 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2829 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2830 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2831 | } |
2832 | ||
760f2d01 DL |
2833 | return table; |
2834 | } | |
1da177e4 LT |
2835 | #endif |
2836 | ||
2c8c1e72 | 2837 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2838 | { |
633d424b | 2839 | int ret = -ENOMEM; |
8ed67789 | 2840 | |
86393e52 AD |
2841 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2842 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2843 | |
fc66f95c ED |
2844 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2845 | goto out_ip6_dst_ops; | |
2846 | ||
8ed67789 DL |
2847 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2848 | sizeof(*net->ipv6.ip6_null_entry), | |
2849 | GFP_KERNEL); | |
2850 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2851 | goto out_ip6_dst_entries; |
d8d1f30b | 2852 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2853 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2854 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2855 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2856 | ip6_template_metrics, true); | |
8ed67789 DL |
2857 | |
2858 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2859 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2860 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2861 | GFP_KERNEL); | |
68fffc67 PZ |
2862 | if (!net->ipv6.ip6_prohibit_entry) |
2863 | goto out_ip6_null_entry; | |
d8d1f30b | 2864 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2865 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2866 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2867 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2868 | ip6_template_metrics, true); | |
8ed67789 DL |
2869 | |
2870 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2871 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2872 | GFP_KERNEL); | |
68fffc67 PZ |
2873 | if (!net->ipv6.ip6_blk_hole_entry) |
2874 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2875 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2876 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2877 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2878 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2879 | ip6_template_metrics, true); | |
8ed67789 DL |
2880 | #endif |
2881 | ||
b339a47c PZ |
2882 | net->ipv6.sysctl.flush_delay = 0; |
2883 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2884 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2885 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2886 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2887 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2888 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2889 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2890 | ||
cdb18761 DL |
2891 | #ifdef CONFIG_PROC_FS |
2892 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2893 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2894 | #endif | |
6891a346 BT |
2895 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2896 | ||
8ed67789 DL |
2897 | ret = 0; |
2898 | out: | |
2899 | return ret; | |
f2fc6a54 | 2900 | |
68fffc67 PZ |
2901 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2902 | out_ip6_prohibit_entry: | |
2903 | kfree(net->ipv6.ip6_prohibit_entry); | |
2904 | out_ip6_null_entry: | |
2905 | kfree(net->ipv6.ip6_null_entry); | |
2906 | #endif | |
fc66f95c ED |
2907 | out_ip6_dst_entries: |
2908 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2909 | out_ip6_dst_ops: |
f2fc6a54 | 2910 | goto out; |
cdb18761 DL |
2911 | } |
2912 | ||
2c8c1e72 | 2913 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2914 | { |
2915 | #ifdef CONFIG_PROC_FS | |
2916 | proc_net_remove(net, "ipv6_route"); | |
2917 | proc_net_remove(net, "rt6_stats"); | |
2918 | #endif | |
8ed67789 DL |
2919 | kfree(net->ipv6.ip6_null_entry); |
2920 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2921 | kfree(net->ipv6.ip6_prohibit_entry); | |
2922 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2923 | #endif | |
41bb78b4 | 2924 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2925 | } |
2926 | ||
2927 | static struct pernet_operations ip6_route_net_ops = { | |
2928 | .init = ip6_route_net_init, | |
2929 | .exit = ip6_route_net_exit, | |
2930 | }; | |
2931 | ||
8ed67789 DL |
2932 | static struct notifier_block ip6_route_dev_notifier = { |
2933 | .notifier_call = ip6_route_dev_notify, | |
2934 | .priority = 0, | |
2935 | }; | |
2936 | ||
433d49c3 | 2937 | int __init ip6_route_init(void) |
1da177e4 | 2938 | { |
433d49c3 DL |
2939 | int ret; |
2940 | ||
9a7ec3a9 DL |
2941 | ret = -ENOMEM; |
2942 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2943 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2944 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2945 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2946 | goto out; |
14e50e57 | 2947 | |
fc66f95c | 2948 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2949 | if (ret) |
bdb3289f | 2950 | goto out_kmem_cache; |
bdb3289f | 2951 | |
fc66f95c ED |
2952 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2953 | if (ret) | |
2954 | goto out_dst_entries; | |
2955 | ||
5dc121e9 AE |
2956 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2957 | ||
8ed67789 DL |
2958 | /* Registering of the loopback is done before this portion of code, |
2959 | * the loopback reference in rt6_info will not be taken, do it | |
2960 | * manually for init_net */ | |
d8d1f30b | 2961 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2962 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2963 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2964 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2965 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2966 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2967 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2968 | #endif | |
433d49c3 DL |
2969 | ret = fib6_init(); |
2970 | if (ret) | |
8ed67789 | 2971 | goto out_register_subsys; |
433d49c3 | 2972 | |
433d49c3 DL |
2973 | ret = xfrm6_init(); |
2974 | if (ret) | |
cdb18761 | 2975 | goto out_fib6_init; |
c35b7e72 | 2976 | |
433d49c3 DL |
2977 | ret = fib6_rules_init(); |
2978 | if (ret) | |
2979 | goto xfrm6_init; | |
7e5449c2 | 2980 | |
433d49c3 | 2981 | ret = -ENOBUFS; |
c7ac8679 GR |
2982 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
2983 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
2984 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
433d49c3 | 2985 | goto fib6_rules_init; |
c127ea2c | 2986 | |
8ed67789 | 2987 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2988 | if (ret) |
2989 | goto fib6_rules_init; | |
8ed67789 | 2990 | |
433d49c3 DL |
2991 | out: |
2992 | return ret; | |
2993 | ||
2994 | fib6_rules_init: | |
433d49c3 DL |
2995 | fib6_rules_cleanup(); |
2996 | xfrm6_init: | |
433d49c3 | 2997 | xfrm6_fini(); |
433d49c3 | 2998 | out_fib6_init: |
433d49c3 | 2999 | fib6_gc_cleanup(); |
8ed67789 DL |
3000 | out_register_subsys: |
3001 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
3002 | out_dst_entries: |
3003 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3004 | out_kmem_cache: |
f2fc6a54 | 3005 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3006 | goto out; |
1da177e4 LT |
3007 | } |
3008 | ||
3009 | void ip6_route_cleanup(void) | |
3010 | { | |
8ed67789 | 3011 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 3012 | fib6_rules_cleanup(); |
1da177e4 | 3013 | xfrm6_fini(); |
1da177e4 | 3014 | fib6_gc_cleanup(); |
8ed67789 | 3015 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3016 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3017 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3018 | } |