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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 | ||
21efcfa0 ED |
65 | static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort, |
66 | const struct in6_addr *dest); | |
1da177e4 | 67 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 68 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 69 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
70 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
71 | static void ip6_dst_destroy(struct dst_entry *); | |
72 | static void ip6_dst_ifdown(struct dst_entry *, | |
73 | struct net_device *dev, int how); | |
569d3645 | 74 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
75 | |
76 | static int ip6_pkt_discard(struct sk_buff *skb); | |
77 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
78 | static void ip6_link_failure(struct sk_buff *skb); | |
79 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
80 | ||
70ceb4f5 | 81 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 82 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
83 | const struct in6_addr *prefix, int prefixlen, |
84 | const struct in6_addr *gwaddr, int ifindex, | |
70ceb4f5 | 85 | unsigned pref); |
efa2cea0 | 86 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
87 | const struct in6_addr *prefix, int prefixlen, |
88 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
89 | #endif |
90 | ||
06582540 DM |
91 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
92 | { | |
93 | struct rt6_info *rt = (struct rt6_info *) dst; | |
94 | struct inet_peer *peer; | |
95 | u32 *p = NULL; | |
96 | ||
8e2ec639 YZ |
97 | if (!(rt->dst.flags & DST_HOST)) |
98 | return NULL; | |
99 | ||
06582540 DM |
100 | if (!rt->rt6i_peer) |
101 | rt6_bind_peer(rt, 1); | |
102 | ||
103 | peer = rt->rt6i_peer; | |
104 | if (peer) { | |
105 | u32 *old_p = __DST_METRICS_PTR(old); | |
106 | unsigned long prev, new; | |
107 | ||
108 | p = peer->metrics; | |
109 | if (inet_metrics_new(peer)) | |
110 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
111 | ||
112 | new = (unsigned long) p; | |
113 | prev = cmpxchg(&dst->_metrics, old, new); | |
114 | ||
115 | if (prev != old) { | |
116 | p = __DST_METRICS_PTR(prev); | |
117 | if (prev & DST_METRICS_READ_ONLY) | |
118 | p = NULL; | |
119 | } | |
120 | } | |
121 | return p; | |
122 | } | |
123 | ||
39232973 DM |
124 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr) |
125 | { | |
126 | struct in6_addr *p = &rt->rt6i_gateway; | |
127 | ||
a7563f34 | 128 | if (!ipv6_addr_any(p)) |
39232973 DM |
129 | return (const void *) p; |
130 | return daddr; | |
131 | } | |
132 | ||
d3aaeb38 DM |
133 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
134 | { | |
39232973 DM |
135 | struct rt6_info *rt = (struct rt6_info *) dst; |
136 | struct neighbour *n; | |
137 | ||
138 | daddr = choose_neigh_daddr(rt, daddr); | |
139 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); | |
f83c7790 DM |
140 | if (n) |
141 | return n; | |
142 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
143 | } | |
144 | ||
8ade06c6 | 145 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
f83c7790 | 146 | { |
8ade06c6 DM |
147 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
148 | if (!n) { | |
149 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); | |
150 | if (IS_ERR(n)) | |
151 | return PTR_ERR(n); | |
152 | } | |
f83c7790 DM |
153 | dst_set_neighbour(&rt->dst, n); |
154 | ||
155 | return 0; | |
d3aaeb38 DM |
156 | } |
157 | ||
9a7ec3a9 | 158 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 159 | .family = AF_INET6, |
09640e63 | 160 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
161 | .gc = ip6_dst_gc, |
162 | .gc_thresh = 1024, | |
163 | .check = ip6_dst_check, | |
0dbaee3b | 164 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 165 | .mtu = ip6_mtu, |
06582540 | 166 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
167 | .destroy = ip6_dst_destroy, |
168 | .ifdown = ip6_dst_ifdown, | |
169 | .negative_advice = ip6_negative_advice, | |
170 | .link_failure = ip6_link_failure, | |
171 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 172 | .local_out = __ip6_local_out, |
d3aaeb38 | 173 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
174 | }; |
175 | ||
ebb762f2 | 176 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 177 | { |
618f9bc7 SK |
178 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
179 | ||
180 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
181 | } |
182 | ||
14e50e57 DM |
183 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
184 | { | |
185 | } | |
186 | ||
0972ddb2 HB |
187 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
188 | unsigned long old) | |
189 | { | |
190 | return NULL; | |
191 | } | |
192 | ||
14e50e57 DM |
193 | static struct dst_ops ip6_dst_blackhole_ops = { |
194 | .family = AF_INET6, | |
09640e63 | 195 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
196 | .destroy = ip6_dst_destroy, |
197 | .check = ip6_dst_check, | |
ebb762f2 | 198 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 199 | .default_advmss = ip6_default_advmss, |
14e50e57 | 200 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 201 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 202 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
203 | }; |
204 | ||
62fa8a84 DM |
205 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
206 | [RTAX_HOPLIMIT - 1] = 255, | |
207 | }; | |
208 | ||
bdb3289f | 209 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
210 | .dst = { |
211 | .__refcnt = ATOMIC_INIT(1), | |
212 | .__use = 1, | |
213 | .obsolete = -1, | |
214 | .error = -ENETUNREACH, | |
d8d1f30b CG |
215 | .input = ip6_pkt_discard, |
216 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
217 | }, |
218 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 219 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
220 | .rt6i_metric = ~(u32) 0, |
221 | .rt6i_ref = ATOMIC_INIT(1), | |
222 | }; | |
223 | ||
101367c2 TG |
224 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
225 | ||
6723ab54 DM |
226 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
227 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 228 | |
280a34c8 | 229 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
230 | .dst = { |
231 | .__refcnt = ATOMIC_INIT(1), | |
232 | .__use = 1, | |
233 | .obsolete = -1, | |
234 | .error = -EACCES, | |
d8d1f30b CG |
235 | .input = ip6_pkt_prohibit, |
236 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
237 | }, |
238 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 239 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
240 | .rt6i_metric = ~(u32) 0, |
241 | .rt6i_ref = ATOMIC_INIT(1), | |
242 | }; | |
243 | ||
bdb3289f | 244 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
245 | .dst = { |
246 | .__refcnt = ATOMIC_INIT(1), | |
247 | .__use = 1, | |
248 | .obsolete = -1, | |
249 | .error = -EINVAL, | |
d8d1f30b CG |
250 | .input = dst_discard, |
251 | .output = dst_discard, | |
101367c2 TG |
252 | }, |
253 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 254 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
255 | .rt6i_metric = ~(u32) 0, |
256 | .rt6i_ref = ATOMIC_INIT(1), | |
257 | }; | |
258 | ||
259 | #endif | |
260 | ||
1da177e4 | 261 | /* allocate dst with ip6_dst_ops */ |
5c1e6aa3 | 262 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops, |
957c665f DM |
263 | struct net_device *dev, |
264 | int flags) | |
1da177e4 | 265 | { |
957c665f | 266 | struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags); |
cf911662 | 267 | |
38308473 | 268 | if (rt) |
fbe58186 | 269 | memset(&rt->rt6i_table, 0, |
38308473 | 270 | sizeof(*rt) - sizeof(struct dst_entry)); |
cf911662 DM |
271 | |
272 | return rt; | |
1da177e4 LT |
273 | } |
274 | ||
275 | static void ip6_dst_destroy(struct dst_entry *dst) | |
276 | { | |
277 | struct rt6_info *rt = (struct rt6_info *)dst; | |
278 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 279 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 | 280 | |
8e2ec639 YZ |
281 | if (!(rt->dst.flags & DST_HOST)) |
282 | dst_destroy_metrics_generic(dst); | |
283 | ||
38308473 | 284 | if (idev) { |
1da177e4 LT |
285 | rt->rt6i_idev = NULL; |
286 | in6_dev_put(idev); | |
1ab1457c | 287 | } |
b3419363 | 288 | if (peer) { |
b3419363 DM |
289 | rt->rt6i_peer = NULL; |
290 | inet_putpeer(peer); | |
291 | } | |
292 | } | |
293 | ||
6431cbc2 DM |
294 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
295 | ||
296 | static u32 rt6_peer_genid(void) | |
297 | { | |
298 | return atomic_read(&__rt6_peer_genid); | |
299 | } | |
300 | ||
b3419363 DM |
301 | void rt6_bind_peer(struct rt6_info *rt, int create) |
302 | { | |
303 | struct inet_peer *peer; | |
304 | ||
b3419363 DM |
305 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
306 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
307 | inet_putpeer(peer); | |
6431cbc2 DM |
308 | else |
309 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1da177e4 LT |
310 | } |
311 | ||
312 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
313 | int how) | |
314 | { | |
315 | struct rt6_info *rt = (struct rt6_info *)dst; | |
316 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 317 | struct net_device *loopback_dev = |
c346dca1 | 318 | dev_net(dev)->loopback_dev; |
1da177e4 | 319 | |
38308473 | 320 | if (dev != loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 DL |
321 | struct inet6_dev *loopback_idev = |
322 | in6_dev_get(loopback_dev); | |
38308473 | 323 | if (loopback_idev) { |
1da177e4 LT |
324 | rt->rt6i_idev = loopback_idev; |
325 | in6_dev_put(idev); | |
326 | } | |
327 | } | |
328 | } | |
329 | ||
330 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
331 | { | |
a02cec21 | 332 | return (rt->rt6i_flags & RTF_EXPIRES) && |
d1918542 | 333 | time_after(jiffies, rt->dst.expires); |
1da177e4 LT |
334 | } |
335 | ||
b71d1d42 | 336 | static inline int rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 337 | { |
a02cec21 ED |
338 | return ipv6_addr_type(daddr) & |
339 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
340 | } |
341 | ||
1da177e4 | 342 | /* |
c71099ac | 343 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
344 | */ |
345 | ||
8ed67789 DL |
346 | static inline struct rt6_info *rt6_device_match(struct net *net, |
347 | struct rt6_info *rt, | |
b71d1d42 | 348 | const struct in6_addr *saddr, |
1da177e4 | 349 | int oif, |
d420895e | 350 | int flags) |
1da177e4 LT |
351 | { |
352 | struct rt6_info *local = NULL; | |
353 | struct rt6_info *sprt; | |
354 | ||
dd3abc4e YH |
355 | if (!oif && ipv6_addr_any(saddr)) |
356 | goto out; | |
357 | ||
d8d1f30b | 358 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 359 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
360 | |
361 | if (oif) { | |
1da177e4 LT |
362 | if (dev->ifindex == oif) |
363 | return sprt; | |
364 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 365 | if (!sprt->rt6i_idev || |
1da177e4 | 366 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 367 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 368 | continue; |
1ab1457c | 369 | if (local && (!oif || |
1da177e4 LT |
370 | local->rt6i_idev->dev->ifindex == oif)) |
371 | continue; | |
372 | } | |
373 | local = sprt; | |
374 | } | |
dd3abc4e YH |
375 | } else { |
376 | if (ipv6_chk_addr(net, saddr, dev, | |
377 | flags & RT6_LOOKUP_F_IFACE)) | |
378 | return sprt; | |
1da177e4 | 379 | } |
dd3abc4e | 380 | } |
1da177e4 | 381 | |
dd3abc4e | 382 | if (oif) { |
1da177e4 LT |
383 | if (local) |
384 | return local; | |
385 | ||
d420895e | 386 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 387 | return net->ipv6.ip6_null_entry; |
1da177e4 | 388 | } |
dd3abc4e | 389 | out: |
1da177e4 LT |
390 | return rt; |
391 | } | |
392 | ||
27097255 YH |
393 | #ifdef CONFIG_IPV6_ROUTER_PREF |
394 | static void rt6_probe(struct rt6_info *rt) | |
395 | { | |
f2c31e32 | 396 | struct neighbour *neigh; |
27097255 YH |
397 | /* |
398 | * Okay, this does not seem to be appropriate | |
399 | * for now, however, we need to check if it | |
400 | * is really so; aka Router Reachability Probing. | |
401 | * | |
402 | * Router Reachability Probe MUST be rate-limited | |
403 | * to no more than one per minute. | |
404 | */ | |
f2c31e32 | 405 | rcu_read_lock(); |
27217455 | 406 | neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL; |
27097255 | 407 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
f2c31e32 | 408 | goto out; |
27097255 YH |
409 | read_lock_bh(&neigh->lock); |
410 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 411 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
412 | struct in6_addr mcaddr; |
413 | struct in6_addr *target; | |
414 | ||
415 | neigh->updated = jiffies; | |
416 | read_unlock_bh(&neigh->lock); | |
417 | ||
418 | target = (struct in6_addr *)&neigh->primary_key; | |
419 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 420 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 421 | } else { |
27097255 | 422 | read_unlock_bh(&neigh->lock); |
f2c31e32 ED |
423 | } |
424 | out: | |
425 | rcu_read_unlock(); | |
27097255 YH |
426 | } |
427 | #else | |
428 | static inline void rt6_probe(struct rt6_info *rt) | |
429 | { | |
27097255 YH |
430 | } |
431 | #endif | |
432 | ||
1da177e4 | 433 | /* |
554cfb7e | 434 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 435 | */ |
b6f99a21 | 436 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 437 | { |
d1918542 | 438 | struct net_device *dev = rt->dst.dev; |
161980f4 | 439 | if (!oif || dev->ifindex == oif) |
554cfb7e | 440 | return 2; |
161980f4 DM |
441 | if ((dev->flags & IFF_LOOPBACK) && |
442 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
443 | return 1; | |
444 | return 0; | |
554cfb7e | 445 | } |
1da177e4 | 446 | |
b6f99a21 | 447 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 448 | { |
f2c31e32 | 449 | struct neighbour *neigh; |
398bcbeb | 450 | int m; |
f2c31e32 ED |
451 | |
452 | rcu_read_lock(); | |
27217455 | 453 | neigh = dst_get_neighbour_noref(&rt->dst); |
4d0c5911 YH |
454 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
455 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
456 | m = 1; | |
457 | else if (neigh) { | |
554cfb7e YH |
458 | read_lock_bh(&neigh->lock); |
459 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 460 | m = 2; |
398bcbeb YH |
461 | #ifdef CONFIG_IPV6_ROUTER_PREF |
462 | else if (neigh->nud_state & NUD_FAILED) | |
463 | m = 0; | |
464 | #endif | |
465 | else | |
ea73ee23 | 466 | m = 1; |
554cfb7e | 467 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
468 | } else |
469 | m = 0; | |
f2c31e32 | 470 | rcu_read_unlock(); |
554cfb7e | 471 | return m; |
1da177e4 LT |
472 | } |
473 | ||
554cfb7e YH |
474 | static int rt6_score_route(struct rt6_info *rt, int oif, |
475 | int strict) | |
1da177e4 | 476 | { |
4d0c5911 | 477 | int m, n; |
1ab1457c | 478 | |
4d0c5911 | 479 | m = rt6_check_dev(rt, oif); |
77d16f45 | 480 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 481 | return -1; |
ebacaaa0 YH |
482 | #ifdef CONFIG_IPV6_ROUTER_PREF |
483 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
484 | #endif | |
4d0c5911 | 485 | n = rt6_check_neigh(rt); |
557e92ef | 486 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
487 | return -1; |
488 | return m; | |
489 | } | |
490 | ||
f11e6659 DM |
491 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
492 | int *mpri, struct rt6_info *match) | |
554cfb7e | 493 | { |
f11e6659 DM |
494 | int m; |
495 | ||
496 | if (rt6_check_expired(rt)) | |
497 | goto out; | |
498 | ||
499 | m = rt6_score_route(rt, oif, strict); | |
500 | if (m < 0) | |
501 | goto out; | |
502 | ||
503 | if (m > *mpri) { | |
504 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
505 | rt6_probe(match); | |
506 | *mpri = m; | |
507 | match = rt; | |
508 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
509 | rt6_probe(rt); | |
510 | } | |
511 | ||
512 | out: | |
513 | return match; | |
514 | } | |
515 | ||
516 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
517 | struct rt6_info *rr_head, | |
518 | u32 metric, int oif, int strict) | |
519 | { | |
520 | struct rt6_info *rt, *match; | |
554cfb7e | 521 | int mpri = -1; |
1da177e4 | 522 | |
f11e6659 DM |
523 | match = NULL; |
524 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 525 | rt = rt->dst.rt6_next) |
f11e6659 DM |
526 | match = find_match(rt, oif, strict, &mpri, match); |
527 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 528 | rt = rt->dst.rt6_next) |
f11e6659 | 529 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 530 | |
f11e6659 DM |
531 | return match; |
532 | } | |
1da177e4 | 533 | |
f11e6659 DM |
534 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
535 | { | |
536 | struct rt6_info *match, *rt0; | |
8ed67789 | 537 | struct net *net; |
1da177e4 | 538 | |
f11e6659 DM |
539 | rt0 = fn->rr_ptr; |
540 | if (!rt0) | |
541 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 542 | |
f11e6659 | 543 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 544 | |
554cfb7e | 545 | if (!match && |
f11e6659 | 546 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 547 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 548 | |
554cfb7e | 549 | /* no entries matched; do round-robin */ |
f11e6659 DM |
550 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
551 | next = fn->leaf; | |
552 | ||
553 | if (next != rt0) | |
554 | fn->rr_ptr = next; | |
1da177e4 | 555 | } |
1da177e4 | 556 | |
d1918542 | 557 | net = dev_net(rt0->dst.dev); |
a02cec21 | 558 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
559 | } |
560 | ||
70ceb4f5 YH |
561 | #ifdef CONFIG_IPV6_ROUTE_INFO |
562 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 563 | const struct in6_addr *gwaddr) |
70ceb4f5 | 564 | { |
c346dca1 | 565 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
566 | struct route_info *rinfo = (struct route_info *) opt; |
567 | struct in6_addr prefix_buf, *prefix; | |
568 | unsigned int pref; | |
4bed72e4 | 569 | unsigned long lifetime; |
70ceb4f5 YH |
570 | struct rt6_info *rt; |
571 | ||
572 | if (len < sizeof(struct route_info)) { | |
573 | return -EINVAL; | |
574 | } | |
575 | ||
576 | /* Sanity check for prefix_len and length */ | |
577 | if (rinfo->length > 3) { | |
578 | return -EINVAL; | |
579 | } else if (rinfo->prefix_len > 128) { | |
580 | return -EINVAL; | |
581 | } else if (rinfo->prefix_len > 64) { | |
582 | if (rinfo->length < 2) { | |
583 | return -EINVAL; | |
584 | } | |
585 | } else if (rinfo->prefix_len > 0) { | |
586 | if (rinfo->length < 1) { | |
587 | return -EINVAL; | |
588 | } | |
589 | } | |
590 | ||
591 | pref = rinfo->route_pref; | |
592 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 593 | return -EINVAL; |
70ceb4f5 | 594 | |
4bed72e4 | 595 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
596 | |
597 | if (rinfo->length == 3) | |
598 | prefix = (struct in6_addr *)rinfo->prefix; | |
599 | else { | |
600 | /* this function is safe */ | |
601 | ipv6_addr_prefix(&prefix_buf, | |
602 | (struct in6_addr *)rinfo->prefix, | |
603 | rinfo->prefix_len); | |
604 | prefix = &prefix_buf; | |
605 | } | |
606 | ||
efa2cea0 DL |
607 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
608 | dev->ifindex); | |
70ceb4f5 YH |
609 | |
610 | if (rt && !lifetime) { | |
e0a1ad73 | 611 | ip6_del_rt(rt); |
70ceb4f5 YH |
612 | rt = NULL; |
613 | } | |
614 | ||
615 | if (!rt && lifetime) | |
efa2cea0 | 616 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
617 | pref); |
618 | else if (rt) | |
619 | rt->rt6i_flags = RTF_ROUTEINFO | | |
620 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
621 | ||
622 | if (rt) { | |
4bed72e4 | 623 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
624 | rt->rt6i_flags &= ~RTF_EXPIRES; |
625 | } else { | |
d1918542 | 626 | rt->dst.expires = jiffies + HZ * lifetime; |
70ceb4f5 YH |
627 | rt->rt6i_flags |= RTF_EXPIRES; |
628 | } | |
d8d1f30b | 629 | dst_release(&rt->dst); |
70ceb4f5 YH |
630 | } |
631 | return 0; | |
632 | } | |
633 | #endif | |
634 | ||
8ed67789 | 635 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 636 | do { \ |
8ed67789 | 637 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 638 | struct fib6_node *pn; \ |
e0eda7bb | 639 | while (1) { \ |
982f56f3 YH |
640 | if (fn->fn_flags & RTN_TL_ROOT) \ |
641 | goto out; \ | |
642 | pn = fn->parent; \ | |
643 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 644 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
645 | else \ |
646 | fn = pn; \ | |
647 | if (fn->fn_flags & RTN_RTINFO) \ | |
648 | goto restart; \ | |
c71099ac | 649 | } \ |
c71099ac | 650 | } \ |
38308473 | 651 | } while (0) |
c71099ac | 652 | |
8ed67789 DL |
653 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
654 | struct fib6_table *table, | |
4c9483b2 | 655 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
656 | { |
657 | struct fib6_node *fn; | |
658 | struct rt6_info *rt; | |
659 | ||
c71099ac | 660 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 661 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
662 | restart: |
663 | rt = fn->leaf; | |
4c9483b2 DM |
664 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
665 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 666 | out: |
d8d1f30b | 667 | dst_use(&rt->dst, jiffies); |
c71099ac | 668 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
669 | return rt; |
670 | ||
671 | } | |
672 | ||
ea6e574e FW |
673 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
674 | int flags) | |
675 | { | |
676 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
677 | } | |
678 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
679 | ||
9acd9f3a YH |
680 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
681 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 682 | { |
4c9483b2 DM |
683 | struct flowi6 fl6 = { |
684 | .flowi6_oif = oif, | |
685 | .daddr = *daddr, | |
c71099ac TG |
686 | }; |
687 | struct dst_entry *dst; | |
77d16f45 | 688 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 689 | |
adaa70bb | 690 | if (saddr) { |
4c9483b2 | 691 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
692 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
693 | } | |
694 | ||
4c9483b2 | 695 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
696 | if (dst->error == 0) |
697 | return (struct rt6_info *) dst; | |
698 | ||
699 | dst_release(dst); | |
700 | ||
1da177e4 LT |
701 | return NULL; |
702 | } | |
703 | ||
7159039a YH |
704 | EXPORT_SYMBOL(rt6_lookup); |
705 | ||
c71099ac | 706 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
707 | It takes new route entry, the addition fails by any reason the |
708 | route is freed. In any case, if caller does not hold it, it may | |
709 | be destroyed. | |
710 | */ | |
711 | ||
86872cb5 | 712 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
713 | { |
714 | int err; | |
c71099ac | 715 | struct fib6_table *table; |
1da177e4 | 716 | |
c71099ac TG |
717 | table = rt->rt6i_table; |
718 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 719 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 720 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
721 | |
722 | return err; | |
723 | } | |
724 | ||
40e22e8f TG |
725 | int ip6_ins_rt(struct rt6_info *rt) |
726 | { | |
4d1169c1 | 727 | struct nl_info info = { |
d1918542 | 728 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 729 | }; |
528c4ceb | 730 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
731 | } |
732 | ||
21efcfa0 ED |
733 | static struct rt6_info *rt6_alloc_cow(const struct rt6_info *ort, |
734 | const struct in6_addr *daddr, | |
b71d1d42 | 735 | const struct in6_addr *saddr) |
1da177e4 | 736 | { |
1da177e4 LT |
737 | struct rt6_info *rt; |
738 | ||
739 | /* | |
740 | * Clone the route. | |
741 | */ | |
742 | ||
21efcfa0 | 743 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
744 | |
745 | if (rt) { | |
14deae41 DM |
746 | int attempts = !in_softirq(); |
747 | ||
38308473 | 748 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 749 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 750 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 751 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 752 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 753 | } |
1da177e4 | 754 | |
1da177e4 | 755 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
756 | |
757 | #ifdef CONFIG_IPV6_SUBTREES | |
758 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 759 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
760 | rt->rt6i_src.plen = 128; |
761 | } | |
762 | #endif | |
763 | ||
14deae41 | 764 | retry: |
8ade06c6 | 765 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
d1918542 | 766 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
767 | int saved_rt_min_interval = |
768 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
769 | int saved_rt_elasticity = | |
770 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
771 | ||
772 | if (attempts-- > 0) { | |
773 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
774 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
775 | ||
86393e52 | 776 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
777 | |
778 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
779 | saved_rt_elasticity; | |
780 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
781 | saved_rt_min_interval; | |
782 | goto retry; | |
783 | } | |
784 | ||
785 | if (net_ratelimit()) | |
786 | printk(KERN_WARNING | |
7e1b33e5 | 787 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 788 | dst_free(&rt->dst); |
14deae41 DM |
789 | return NULL; |
790 | } | |
95a9a5ba | 791 | } |
1da177e4 | 792 | |
95a9a5ba YH |
793 | return rt; |
794 | } | |
1da177e4 | 795 | |
21efcfa0 ED |
796 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
797 | const struct in6_addr *daddr) | |
299d9939 | 798 | { |
21efcfa0 ED |
799 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
800 | ||
299d9939 | 801 | if (rt) { |
299d9939 | 802 | rt->rt6i_flags |= RTF_CACHE; |
27217455 | 803 | dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst))); |
299d9939 YH |
804 | } |
805 | return rt; | |
806 | } | |
807 | ||
8ed67789 | 808 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 809 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
810 | { |
811 | struct fib6_node *fn; | |
519fbd87 | 812 | struct rt6_info *rt, *nrt; |
c71099ac | 813 | int strict = 0; |
1da177e4 | 814 | int attempts = 3; |
519fbd87 | 815 | int err; |
53b7997f | 816 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 817 | |
77d16f45 | 818 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
819 | |
820 | relookup: | |
c71099ac | 821 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 822 | |
8238dd06 | 823 | restart_2: |
4c9483b2 | 824 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
825 | |
826 | restart: | |
4acad72d | 827 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 828 | |
4c9483b2 | 829 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 830 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 831 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 832 | goto out; |
1da177e4 | 833 | |
d8d1f30b | 834 | dst_hold(&rt->dst); |
c71099ac | 835 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 836 | |
27217455 | 837 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 838 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 839 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 840 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
841 | else |
842 | goto out2; | |
e40cf353 | 843 | |
d8d1f30b | 844 | dst_release(&rt->dst); |
8ed67789 | 845 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 846 | |
d8d1f30b | 847 | dst_hold(&rt->dst); |
519fbd87 | 848 | if (nrt) { |
40e22e8f | 849 | err = ip6_ins_rt(nrt); |
519fbd87 | 850 | if (!err) |
1da177e4 | 851 | goto out2; |
1da177e4 | 852 | } |
1da177e4 | 853 | |
519fbd87 YH |
854 | if (--attempts <= 0) |
855 | goto out2; | |
856 | ||
857 | /* | |
c71099ac | 858 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
859 | * released someone could insert this route. Relookup. |
860 | */ | |
d8d1f30b | 861 | dst_release(&rt->dst); |
519fbd87 YH |
862 | goto relookup; |
863 | ||
864 | out: | |
8238dd06 YH |
865 | if (reachable) { |
866 | reachable = 0; | |
867 | goto restart_2; | |
868 | } | |
d8d1f30b | 869 | dst_hold(&rt->dst); |
c71099ac | 870 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 871 | out2: |
d8d1f30b CG |
872 | rt->dst.lastuse = jiffies; |
873 | rt->dst.__use++; | |
c71099ac TG |
874 | |
875 | return rt; | |
1da177e4 LT |
876 | } |
877 | ||
8ed67789 | 878 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 879 | struct flowi6 *fl6, int flags) |
4acad72d | 880 | { |
4c9483b2 | 881 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
882 | } |
883 | ||
c71099ac TG |
884 | void ip6_route_input(struct sk_buff *skb) |
885 | { | |
b71d1d42 | 886 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 887 | struct net *net = dev_net(skb->dev); |
adaa70bb | 888 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
889 | struct flowi6 fl6 = { |
890 | .flowi6_iif = skb->dev->ifindex, | |
891 | .daddr = iph->daddr, | |
892 | .saddr = iph->saddr, | |
38308473 | 893 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
894 | .flowi6_mark = skb->mark, |
895 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 896 | }; |
adaa70bb | 897 | |
1d6e55f1 | 898 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 899 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 900 | |
4c9483b2 | 901 | skb_dst_set(skb, fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_input)); |
c71099ac TG |
902 | } |
903 | ||
8ed67789 | 904 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 905 | struct flowi6 *fl6, int flags) |
1da177e4 | 906 | { |
4c9483b2 | 907 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
908 | } |
909 | ||
9c7a4f9c | 910 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 911 | struct flowi6 *fl6) |
c71099ac TG |
912 | { |
913 | int flags = 0; | |
914 | ||
4c9483b2 | 915 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 916 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 917 | |
4c9483b2 | 918 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 919 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
920 | else if (sk) |
921 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 922 | |
4c9483b2 | 923 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
924 | } |
925 | ||
7159039a | 926 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 927 | |
2774c131 | 928 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 929 | { |
5c1e6aa3 | 930 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
931 | struct dst_entry *new = NULL; |
932 | ||
5c1e6aa3 | 933 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 934 | if (rt) { |
cf911662 DM |
935 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
936 | ||
d8d1f30b | 937 | new = &rt->dst; |
14e50e57 | 938 | |
14e50e57 | 939 | new->__use = 1; |
352e512c HX |
940 | new->input = dst_discard; |
941 | new->output = dst_discard; | |
14e50e57 | 942 | |
21efcfa0 ED |
943 | if (dst_metrics_read_only(&ort->dst)) |
944 | new->_metrics = ort->dst._metrics; | |
945 | else | |
946 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
947 | rt->rt6i_idev = ort->rt6i_idev; |
948 | if (rt->rt6i_idev) | |
949 | in6_dev_hold(rt->rt6i_idev); | |
d1918542 | 950 | rt->dst.expires = 0; |
14e50e57 | 951 | |
4e3fd7a0 | 952 | rt->rt6i_gateway = ort->rt6i_gateway; |
14e50e57 DM |
953 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
954 | rt->rt6i_metric = 0; | |
955 | ||
956 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
957 | #ifdef CONFIG_IPV6_SUBTREES | |
958 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
959 | #endif | |
960 | ||
961 | dst_free(new); | |
962 | } | |
963 | ||
69ead7af DM |
964 | dst_release(dst_orig); |
965 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 966 | } |
14e50e57 | 967 | |
1da177e4 LT |
968 | /* |
969 | * Destination cache support functions | |
970 | */ | |
971 | ||
972 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
973 | { | |
974 | struct rt6_info *rt; | |
975 | ||
976 | rt = (struct rt6_info *) dst; | |
977 | ||
6431cbc2 DM |
978 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
979 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
980 | if (!rt->rt6i_peer) | |
981 | rt6_bind_peer(rt, 0); | |
982 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
983 | } | |
1da177e4 | 984 | return dst; |
6431cbc2 | 985 | } |
1da177e4 LT |
986 | return NULL; |
987 | } | |
988 | ||
989 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
990 | { | |
991 | struct rt6_info *rt = (struct rt6_info *) dst; | |
992 | ||
993 | if (rt) { | |
54c1a859 YH |
994 | if (rt->rt6i_flags & RTF_CACHE) { |
995 | if (rt6_check_expired(rt)) { | |
996 | ip6_del_rt(rt); | |
997 | dst = NULL; | |
998 | } | |
999 | } else { | |
1da177e4 | 1000 | dst_release(dst); |
54c1a859 YH |
1001 | dst = NULL; |
1002 | } | |
1da177e4 | 1003 | } |
54c1a859 | 1004 | return dst; |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | static void ip6_link_failure(struct sk_buff *skb) | |
1008 | { | |
1009 | struct rt6_info *rt; | |
1010 | ||
3ffe533c | 1011 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1012 | |
adf30907 | 1013 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1014 | if (rt) { |
38308473 | 1015 | if (rt->rt6i_flags & RTF_CACHE) { |
d8d1f30b | 1016 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
1017 | rt->rt6i_flags |= RTF_EXPIRES; |
1018 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1019 | rt->rt6i_node->fn_sernum = -1; | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1024 | { | |
1025 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1026 | ||
1027 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
1028 | rt6->rt6i_flags |= RTF_MODIFIED; | |
1029 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1030 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1031 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1032 | features |= RTAX_FEATURE_ALLFRAG; |
1033 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1034 | } |
defb3519 | 1035 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
1036 | } |
1037 | } | |
1038 | ||
0dbaee3b | 1039 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1040 | { |
0dbaee3b DM |
1041 | struct net_device *dev = dst->dev; |
1042 | unsigned int mtu = dst_mtu(dst); | |
1043 | struct net *net = dev_net(dev); | |
1044 | ||
1da177e4 LT |
1045 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1046 | ||
5578689a DL |
1047 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1048 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1049 | |
1050 | /* | |
1ab1457c YH |
1051 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1052 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1053 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1054 | * rely only on pmtu discovery" |
1055 | */ | |
1056 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1057 | mtu = IPV6_MAXPLEN; | |
1058 | return mtu; | |
1059 | } | |
1060 | ||
ebb762f2 | 1061 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1062 | { |
d33e4553 | 1063 | struct inet6_dev *idev; |
618f9bc7 SK |
1064 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1065 | ||
1066 | if (mtu) | |
1067 | return mtu; | |
1068 | ||
1069 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1070 | |
1071 | rcu_read_lock(); | |
1072 | idev = __in6_dev_get(dst->dev); | |
1073 | if (idev) | |
1074 | mtu = idev->cnf.mtu6; | |
1075 | rcu_read_unlock(); | |
1076 | ||
1077 | return mtu; | |
1078 | } | |
1079 | ||
3b00944c YH |
1080 | static struct dst_entry *icmp6_dst_gc_list; |
1081 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1082 | |
3b00944c | 1083 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1084 | struct neighbour *neigh, |
87a11578 | 1085 | struct flowi6 *fl6) |
1da177e4 | 1086 | { |
87a11578 | 1087 | struct dst_entry *dst; |
1da177e4 LT |
1088 | struct rt6_info *rt; |
1089 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1090 | struct net *net = dev_net(dev); |
1da177e4 | 1091 | |
38308473 | 1092 | if (unlikely(!idev)) |
122bdf67 | 1093 | return ERR_PTR(-ENODEV); |
1da177e4 | 1094 | |
957c665f | 1095 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0); |
38308473 | 1096 | if (unlikely(!rt)) { |
1da177e4 | 1097 | in6_dev_put(idev); |
87a11578 | 1098 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1099 | goto out; |
1100 | } | |
1101 | ||
1da177e4 LT |
1102 | if (neigh) |
1103 | neigh_hold(neigh); | |
14deae41 | 1104 | else { |
f83c7790 | 1105 | neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr); |
b43faac6 | 1106 | if (IS_ERR(neigh)) { |
252c3d84 | 1107 | in6_dev_put(idev); |
b43faac6 DM |
1108 | dst_free(&rt->dst); |
1109 | return ERR_CAST(neigh); | |
1110 | } | |
14deae41 | 1111 | } |
1da177e4 | 1112 | |
8e2ec639 YZ |
1113 | rt->dst.flags |= DST_HOST; |
1114 | rt->dst.output = ip6_output; | |
69cce1d1 | 1115 | dst_set_neighbour(&rt->dst, neigh); |
d8d1f30b | 1116 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1117 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1118 | rt->rt6i_dst.plen = 128; |
1119 | rt->rt6i_idev = idev; | |
7011687f | 1120 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1121 | |
3b00944c | 1122 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1123 | rt->dst.next = icmp6_dst_gc_list; |
1124 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1125 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1126 | |
5578689a | 1127 | fib6_force_start_gc(net); |
1da177e4 | 1128 | |
87a11578 DM |
1129 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1130 | ||
1da177e4 | 1131 | out: |
87a11578 | 1132 | return dst; |
1da177e4 LT |
1133 | } |
1134 | ||
3d0f24a7 | 1135 | int icmp6_dst_gc(void) |
1da177e4 | 1136 | { |
e9476e95 | 1137 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1138 | int more = 0; |
1da177e4 | 1139 | |
3b00944c YH |
1140 | spin_lock_bh(&icmp6_dst_lock); |
1141 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1142 | |
1da177e4 LT |
1143 | while ((dst = *pprev) != NULL) { |
1144 | if (!atomic_read(&dst->__refcnt)) { | |
1145 | *pprev = dst->next; | |
1146 | dst_free(dst); | |
1da177e4 LT |
1147 | } else { |
1148 | pprev = &dst->next; | |
3d0f24a7 | 1149 | ++more; |
1da177e4 LT |
1150 | } |
1151 | } | |
1152 | ||
3b00944c | 1153 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1154 | |
3d0f24a7 | 1155 | return more; |
1da177e4 LT |
1156 | } |
1157 | ||
1e493d19 DM |
1158 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1159 | void *arg) | |
1160 | { | |
1161 | struct dst_entry *dst, **pprev; | |
1162 | ||
1163 | spin_lock_bh(&icmp6_dst_lock); | |
1164 | pprev = &icmp6_dst_gc_list; | |
1165 | while ((dst = *pprev) != NULL) { | |
1166 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1167 | if (func(rt, arg)) { | |
1168 | *pprev = dst->next; | |
1169 | dst_free(dst); | |
1170 | } else { | |
1171 | pprev = &dst->next; | |
1172 | } | |
1173 | } | |
1174 | spin_unlock_bh(&icmp6_dst_lock); | |
1175 | } | |
1176 | ||
569d3645 | 1177 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1178 | { |
1da177e4 | 1179 | unsigned long now = jiffies; |
86393e52 | 1180 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1181 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1182 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1183 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1184 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1185 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1186 | int entries; |
7019b78e | 1187 | |
fc66f95c | 1188 | entries = dst_entries_get_fast(ops); |
7019b78e | 1189 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1190 | entries <= rt_max_size) |
1da177e4 LT |
1191 | goto out; |
1192 | ||
6891a346 BT |
1193 | net->ipv6.ip6_rt_gc_expire++; |
1194 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1195 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1196 | entries = dst_entries_get_slow(ops); |
1197 | if (entries < ops->gc_thresh) | |
7019b78e | 1198 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1199 | out: |
7019b78e | 1200 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1201 | return entries > rt_max_size; |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1205 | but results in cleaner routing tables. | |
1206 | ||
1207 | Remove it only when all the things will work! | |
1208 | */ | |
1209 | ||
6b75d090 | 1210 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1211 | { |
5170ae82 | 1212 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1213 | if (hoplimit == 0) { |
6b75d090 | 1214 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1215 | struct inet6_dev *idev; |
1216 | ||
1217 | rcu_read_lock(); | |
1218 | idev = __in6_dev_get(dev); | |
1219 | if (idev) | |
6b75d090 | 1220 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1221 | else |
53b7997f | 1222 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1223 | rcu_read_unlock(); |
1da177e4 LT |
1224 | } |
1225 | return hoplimit; | |
1226 | } | |
abbf46ae | 1227 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1228 | |
1229 | /* | |
1230 | * | |
1231 | */ | |
1232 | ||
86872cb5 | 1233 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1234 | { |
1235 | int err; | |
5578689a | 1236 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1237 | struct rt6_info *rt = NULL; |
1238 | struct net_device *dev = NULL; | |
1239 | struct inet6_dev *idev = NULL; | |
c71099ac | 1240 | struct fib6_table *table; |
1da177e4 LT |
1241 | int addr_type; |
1242 | ||
86872cb5 | 1243 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1244 | return -EINVAL; |
1245 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1246 | if (cfg->fc_src_len) |
1da177e4 LT |
1247 | return -EINVAL; |
1248 | #endif | |
86872cb5 | 1249 | if (cfg->fc_ifindex) { |
1da177e4 | 1250 | err = -ENODEV; |
5578689a | 1251 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1252 | if (!dev) |
1253 | goto out; | |
1254 | idev = in6_dev_get(dev); | |
1255 | if (!idev) | |
1256 | goto out; | |
1257 | } | |
1258 | ||
86872cb5 TG |
1259 | if (cfg->fc_metric == 0) |
1260 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1261 | |
d71314b4 | 1262 | err = -ENOBUFS; |
38308473 DM |
1263 | if (cfg->fc_nlinfo.nlh && |
1264 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1265 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1266 | if (!table) { |
d71314b4 MV |
1267 | printk(KERN_WARNING "IPv6: NLM_F_CREATE should be specified when creating new route\n"); |
1268 | table = fib6_new_table(net, cfg->fc_table); | |
1269 | } | |
1270 | } else { | |
1271 | table = fib6_new_table(net, cfg->fc_table); | |
1272 | } | |
38308473 DM |
1273 | |
1274 | if (!table) | |
c71099ac | 1275 | goto out; |
c71099ac | 1276 | |
957c665f | 1277 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT); |
1da177e4 | 1278 | |
38308473 | 1279 | if (!rt) { |
1da177e4 LT |
1280 | err = -ENOMEM; |
1281 | goto out; | |
1282 | } | |
1283 | ||
d8d1f30b | 1284 | rt->dst.obsolete = -1; |
d1918542 | 1285 | rt->dst.expires = (cfg->fc_flags & RTF_EXPIRES) ? |
6f704992 YH |
1286 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : |
1287 | 0; | |
1da177e4 | 1288 | |
86872cb5 TG |
1289 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1290 | cfg->fc_protocol = RTPROT_BOOT; | |
1291 | rt->rt6i_protocol = cfg->fc_protocol; | |
1292 | ||
1293 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1294 | |
1295 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1296 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1297 | else if (cfg->fc_flags & RTF_LOCAL) |
1298 | rt->dst.input = ip6_input; | |
1da177e4 | 1299 | else |
d8d1f30b | 1300 | rt->dst.input = ip6_forward; |
1da177e4 | 1301 | |
d8d1f30b | 1302 | rt->dst.output = ip6_output; |
1da177e4 | 1303 | |
86872cb5 TG |
1304 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1305 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1306 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1307 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1308 | |
8e2ec639 YZ |
1309 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1310 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1311 | if (!metrics) { | |
1312 | err = -ENOMEM; | |
1313 | goto out; | |
1314 | } | |
1315 | dst_init_metrics(&rt->dst, metrics, 0); | |
1316 | } | |
1da177e4 | 1317 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1318 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1319 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1320 | #endif |
1321 | ||
86872cb5 | 1322 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1323 | |
1324 | /* We cannot add true routes via loopback here, | |
1325 | they would result in kernel looping; promote them to reject routes | |
1326 | */ | |
86872cb5 | 1327 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1328 | (dev && (dev->flags & IFF_LOOPBACK) && |
1329 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1330 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1331 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1332 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1333 | if (dev) { |
1334 | dev_put(dev); | |
1335 | in6_dev_put(idev); | |
1336 | } | |
5578689a | 1337 | dev = net->loopback_dev; |
1da177e4 LT |
1338 | dev_hold(dev); |
1339 | idev = in6_dev_get(dev); | |
1340 | if (!idev) { | |
1341 | err = -ENODEV; | |
1342 | goto out; | |
1343 | } | |
1344 | } | |
d8d1f30b CG |
1345 | rt->dst.output = ip6_pkt_discard_out; |
1346 | rt->dst.input = ip6_pkt_discard; | |
1347 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1348 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1349 | goto install_route; | |
1350 | } | |
1351 | ||
86872cb5 | 1352 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1353 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1354 | int gwa_type; |
1355 | ||
86872cb5 | 1356 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1357 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1358 | gwa_type = ipv6_addr_type(gw_addr); |
1359 | ||
1360 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1361 | struct rt6_info *grt; | |
1362 | ||
1363 | /* IPv6 strictly inhibits using not link-local | |
1364 | addresses as nexthop address. | |
1365 | Otherwise, router will not able to send redirects. | |
1366 | It is very good, but in some (rare!) circumstances | |
1367 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1368 | some exceptions. --ANK | |
1369 | */ | |
1370 | err = -EINVAL; | |
38308473 | 1371 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1372 | goto out; |
1373 | ||
5578689a | 1374 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1375 | |
1376 | err = -EHOSTUNREACH; | |
38308473 | 1377 | if (!grt) |
1da177e4 LT |
1378 | goto out; |
1379 | if (dev) { | |
d1918542 | 1380 | if (dev != grt->dst.dev) { |
d8d1f30b | 1381 | dst_release(&grt->dst); |
1da177e4 LT |
1382 | goto out; |
1383 | } | |
1384 | } else { | |
d1918542 | 1385 | dev = grt->dst.dev; |
1da177e4 LT |
1386 | idev = grt->rt6i_idev; |
1387 | dev_hold(dev); | |
1388 | in6_dev_hold(grt->rt6i_idev); | |
1389 | } | |
38308473 | 1390 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1391 | err = 0; |
d8d1f30b | 1392 | dst_release(&grt->dst); |
1da177e4 LT |
1393 | |
1394 | if (err) | |
1395 | goto out; | |
1396 | } | |
1397 | err = -EINVAL; | |
38308473 | 1398 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1399 | goto out; |
1400 | } | |
1401 | ||
1402 | err = -ENODEV; | |
38308473 | 1403 | if (!dev) |
1da177e4 LT |
1404 | goto out; |
1405 | ||
c3968a85 DW |
1406 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1407 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1408 | err = -EINVAL; | |
1409 | goto out; | |
1410 | } | |
4e3fd7a0 | 1411 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1412 | rt->rt6i_prefsrc.plen = 128; |
1413 | } else | |
1414 | rt->rt6i_prefsrc.plen = 0; | |
1415 | ||
86872cb5 | 1416 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
8ade06c6 | 1417 | err = rt6_bind_neighbour(rt, dev); |
f83c7790 | 1418 | if (err) |
1da177e4 | 1419 | goto out; |
1da177e4 LT |
1420 | } |
1421 | ||
86872cb5 | 1422 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1423 | |
1424 | install_route: | |
86872cb5 TG |
1425 | if (cfg->fc_mx) { |
1426 | struct nlattr *nla; | |
1427 | int remaining; | |
1428 | ||
1429 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1430 | int type = nla_type(nla); |
86872cb5 TG |
1431 | |
1432 | if (type) { | |
1433 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1434 | err = -EINVAL; |
1435 | goto out; | |
1436 | } | |
86872cb5 | 1437 | |
defb3519 | 1438 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1439 | } |
1da177e4 LT |
1440 | } |
1441 | } | |
1442 | ||
d8d1f30b | 1443 | rt->dst.dev = dev; |
1da177e4 | 1444 | rt->rt6i_idev = idev; |
c71099ac | 1445 | rt->rt6i_table = table; |
63152fc0 | 1446 | |
c346dca1 | 1447 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1448 | |
86872cb5 | 1449 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1450 | |
1451 | out: | |
1452 | if (dev) | |
1453 | dev_put(dev); | |
1454 | if (idev) | |
1455 | in6_dev_put(idev); | |
1456 | if (rt) | |
d8d1f30b | 1457 | dst_free(&rt->dst); |
1da177e4 LT |
1458 | return err; |
1459 | } | |
1460 | ||
86872cb5 | 1461 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1462 | { |
1463 | int err; | |
c71099ac | 1464 | struct fib6_table *table; |
d1918542 | 1465 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1466 | |
8ed67789 | 1467 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1468 | return -ENOENT; |
1469 | ||
c71099ac TG |
1470 | table = rt->rt6i_table; |
1471 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1472 | |
86872cb5 | 1473 | err = fib6_del(rt, info); |
d8d1f30b | 1474 | dst_release(&rt->dst); |
1da177e4 | 1475 | |
c71099ac | 1476 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1477 | |
1478 | return err; | |
1479 | } | |
1480 | ||
e0a1ad73 TG |
1481 | int ip6_del_rt(struct rt6_info *rt) |
1482 | { | |
4d1169c1 | 1483 | struct nl_info info = { |
d1918542 | 1484 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1485 | }; |
528c4ceb | 1486 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1487 | } |
1488 | ||
86872cb5 | 1489 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1490 | { |
c71099ac | 1491 | struct fib6_table *table; |
1da177e4 LT |
1492 | struct fib6_node *fn; |
1493 | struct rt6_info *rt; | |
1494 | int err = -ESRCH; | |
1495 | ||
5578689a | 1496 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1497 | if (!table) |
c71099ac TG |
1498 | return err; |
1499 | ||
1500 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1501 | |
c71099ac | 1502 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1503 | &cfg->fc_dst, cfg->fc_dst_len, |
1504 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1505 | |
1da177e4 | 1506 | if (fn) { |
d8d1f30b | 1507 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1508 | if (cfg->fc_ifindex && |
d1918542 DM |
1509 | (!rt->dst.dev || |
1510 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1511 | continue; |
86872cb5 TG |
1512 | if (cfg->fc_flags & RTF_GATEWAY && |
1513 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1514 | continue; |
86872cb5 | 1515 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1516 | continue; |
d8d1f30b | 1517 | dst_hold(&rt->dst); |
c71099ac | 1518 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1519 | |
86872cb5 | 1520 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1521 | } |
1522 | } | |
c71099ac | 1523 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1524 | |
1525 | return err; | |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * Handle redirects | |
1530 | */ | |
a6279458 | 1531 | struct ip6rd_flowi { |
4c9483b2 | 1532 | struct flowi6 fl6; |
a6279458 YH |
1533 | struct in6_addr gateway; |
1534 | }; | |
1535 | ||
8ed67789 DL |
1536 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1537 | struct fib6_table *table, | |
4c9483b2 | 1538 | struct flowi6 *fl6, |
a6279458 | 1539 | int flags) |
1da177e4 | 1540 | { |
4c9483b2 | 1541 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
a6279458 | 1542 | struct rt6_info *rt; |
e843b9e1 | 1543 | struct fib6_node *fn; |
c71099ac | 1544 | |
1da177e4 | 1545 | /* |
e843b9e1 YH |
1546 | * Get the "current" route for this destination and |
1547 | * check if the redirect has come from approriate router. | |
1548 | * | |
1549 | * RFC 2461 specifies that redirects should only be | |
1550 | * accepted if they come from the nexthop to the target. | |
1551 | * Due to the way the routes are chosen, this notion | |
1552 | * is a bit fuzzy and one might need to check all possible | |
1553 | * routes. | |
1da177e4 | 1554 | */ |
1da177e4 | 1555 | |
c71099ac | 1556 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 1557 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
e843b9e1 | 1558 | restart: |
d8d1f30b | 1559 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1560 | /* |
1561 | * Current route is on-link; redirect is always invalid. | |
1562 | * | |
1563 | * Seems, previous statement is not true. It could | |
1564 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1565 | * But then router serving it might decide, that we should | |
1566 | * know truth 8)8) --ANK (980726). | |
1567 | */ | |
1568 | if (rt6_check_expired(rt)) | |
1569 | continue; | |
1570 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1571 | continue; | |
d1918542 | 1572 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) |
e843b9e1 | 1573 | continue; |
a6279458 | 1574 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1575 | continue; |
1576 | break; | |
1577 | } | |
a6279458 | 1578 | |
cb15d9c2 | 1579 | if (!rt) |
8ed67789 | 1580 | rt = net->ipv6.ip6_null_entry; |
4c9483b2 | 1581 | BACKTRACK(net, &fl6->saddr); |
cb15d9c2 | 1582 | out: |
d8d1f30b | 1583 | dst_hold(&rt->dst); |
a6279458 | 1584 | |
c71099ac | 1585 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1586 | |
a6279458 YH |
1587 | return rt; |
1588 | }; | |
1589 | ||
b71d1d42 ED |
1590 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
1591 | const struct in6_addr *src, | |
1592 | const struct in6_addr *gateway, | |
a6279458 YH |
1593 | struct net_device *dev) |
1594 | { | |
adaa70bb | 1595 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1596 | struct net *net = dev_net(dev); |
a6279458 | 1597 | struct ip6rd_flowi rdfl = { |
4c9483b2 DM |
1598 | .fl6 = { |
1599 | .flowi6_oif = dev->ifindex, | |
1600 | .daddr = *dest, | |
1601 | .saddr = *src, | |
a6279458 | 1602 | }, |
a6279458 | 1603 | }; |
adaa70bb | 1604 | |
4e3fd7a0 | 1605 | rdfl.gateway = *gateway; |
86c36ce4 | 1606 | |
adaa70bb TG |
1607 | if (rt6_need_strict(dest)) |
1608 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1609 | |
4c9483b2 | 1610 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
58f09b78 | 1611 | flags, __ip6_route_redirect); |
a6279458 YH |
1612 | } |
1613 | ||
b71d1d42 ED |
1614 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
1615 | const struct in6_addr *saddr, | |
a6279458 YH |
1616 | struct neighbour *neigh, u8 *lladdr, int on_link) |
1617 | { | |
1618 | struct rt6_info *rt, *nrt = NULL; | |
1619 | struct netevent_redirect netevent; | |
c346dca1 | 1620 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1621 | |
1622 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1623 | ||
8ed67789 | 1624 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1625 | if (net_ratelimit()) |
1626 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1627 | "for redirect target\n"); | |
a6279458 | 1628 | goto out; |
1da177e4 LT |
1629 | } |
1630 | ||
1da177e4 LT |
1631 | /* |
1632 | * We have finally decided to accept it. | |
1633 | */ | |
1634 | ||
1ab1457c | 1635 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1636 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1637 | NEIGH_UPDATE_F_OVERRIDE| | |
1638 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1639 | NEIGH_UPDATE_F_ISROUTER)) | |
1640 | ); | |
1641 | ||
1642 | /* | |
1643 | * Redirect received -> path was valid. | |
1644 | * Look, redirects are sent only in response to data packets, | |
1645 | * so that this nexthop apparently is reachable. --ANK | |
1646 | */ | |
d8d1f30b | 1647 | dst_confirm(&rt->dst); |
1da177e4 LT |
1648 | |
1649 | /* Duplicate redirect: silently ignore. */ | |
27217455 | 1650 | if (neigh == dst_get_neighbour_noref_raw(&rt->dst)) |
1da177e4 LT |
1651 | goto out; |
1652 | ||
21efcfa0 | 1653 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1654 | if (!nrt) |
1da177e4 LT |
1655 | goto out; |
1656 | ||
1657 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1658 | if (on_link) | |
1659 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1660 | ||
4e3fd7a0 | 1661 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
69cce1d1 | 1662 | dst_set_neighbour(&nrt->dst, neigh_clone(neigh)); |
1da177e4 | 1663 | |
40e22e8f | 1664 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1665 | goto out; |
1666 | ||
d8d1f30b CG |
1667 | netevent.old = &rt->dst; |
1668 | netevent.new = &nrt->dst; | |
8d71740c TT |
1669 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1670 | ||
38308473 | 1671 | if (rt->rt6i_flags & RTF_CACHE) { |
e0a1ad73 | 1672 | ip6_del_rt(rt); |
1da177e4 LT |
1673 | return; |
1674 | } | |
1675 | ||
1676 | out: | |
d8d1f30b | 1677 | dst_release(&rt->dst); |
1da177e4 LT |
1678 | } |
1679 | ||
1680 | /* | |
1681 | * Handle ICMP "packet too big" messages | |
1682 | * i.e. Path MTU discovery | |
1683 | */ | |
1684 | ||
b71d1d42 | 1685 | static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 | 1686 | struct net *net, u32 pmtu, int ifindex) |
1da177e4 LT |
1687 | { |
1688 | struct rt6_info *rt, *nrt; | |
1689 | int allfrag = 0; | |
d3052b55 | 1690 | again: |
ae878ae2 | 1691 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
38308473 | 1692 | if (!rt) |
1da177e4 LT |
1693 | return; |
1694 | ||
d3052b55 AV |
1695 | if (rt6_check_expired(rt)) { |
1696 | ip6_del_rt(rt); | |
1697 | goto again; | |
1698 | } | |
1699 | ||
d8d1f30b | 1700 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1701 | goto out; |
1702 | ||
1703 | if (pmtu < IPV6_MIN_MTU) { | |
1704 | /* | |
1ab1457c | 1705 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1706 | * MTU (1280) and a fragment header should always be included |
1707 | * after a node receiving Too Big message reporting PMTU is | |
1708 | * less than the IPv6 Minimum Link MTU. | |
1709 | */ | |
1710 | pmtu = IPV6_MIN_MTU; | |
1711 | allfrag = 1; | |
1712 | } | |
1713 | ||
1714 | /* New mtu received -> path was valid. | |
1715 | They are sent only in response to data packets, | |
1716 | so that this nexthop apparently is reachable. --ANK | |
1717 | */ | |
d8d1f30b | 1718 | dst_confirm(&rt->dst); |
1da177e4 LT |
1719 | |
1720 | /* Host route. If it is static, it would be better | |
1721 | not to override it, but add new one, so that | |
1722 | when cache entry will expire old pmtu | |
1723 | would return automatically. | |
1724 | */ | |
1725 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1726 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1727 | if (allfrag) { | |
1728 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1729 | features |= RTAX_FEATURE_ALLFRAG; | |
1730 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1731 | } | |
d8d1f30b | 1732 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1733 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1734 | goto out; | |
1735 | } | |
1736 | ||
1737 | /* Network route. | |
1738 | Two cases are possible: | |
1739 | 1. It is connected route. Action: COW | |
1740 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1741 | */ | |
27217455 | 1742 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1743 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1744 | else |
1745 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1746 | |
d5315b50 | 1747 | if (nrt) { |
defb3519 DM |
1748 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1749 | if (allfrag) { | |
1750 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1751 | features |= RTAX_FEATURE_ALLFRAG; | |
1752 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1753 | } | |
a1e78363 YH |
1754 | |
1755 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1756 | * happened within 5 mins, the recommended timer is 10 mins. | |
1757 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1758 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1759 | * and detecting PMTU increase will be automatically happened. | |
1760 | */ | |
d8d1f30b | 1761 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1762 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1763 | ||
40e22e8f | 1764 | ip6_ins_rt(nrt); |
1da177e4 | 1765 | } |
1da177e4 | 1766 | out: |
d8d1f30b | 1767 | dst_release(&rt->dst); |
1da177e4 LT |
1768 | } |
1769 | ||
b71d1d42 | 1770 | void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 MŻ |
1771 | struct net_device *dev, u32 pmtu) |
1772 | { | |
1773 | struct net *net = dev_net(dev); | |
1774 | ||
1775 | /* | |
1776 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1777 | * is sending along the path" that caused the Packet Too Big message. | |
1778 | * Since it's not possible in the general case to determine which | |
1779 | * interface was used to send the original packet, we update the MTU | |
1780 | * on the interface that will be used to send future packets. We also | |
1781 | * update the MTU on the interface that received the Packet Too Big in | |
1782 | * case the original packet was forced out that interface with | |
1783 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1784 | * correct behaviour, which would be to update the MTU on all | |
1785 | * interfaces. | |
1786 | */ | |
1787 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1788 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1789 | } | |
1790 | ||
1da177e4 LT |
1791 | /* |
1792 | * Misc support functions | |
1793 | */ | |
1794 | ||
21efcfa0 ED |
1795 | static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort, |
1796 | const struct in6_addr *dest) | |
1da177e4 | 1797 | { |
d1918542 | 1798 | struct net *net = dev_net(ort->dst.dev); |
5c1e6aa3 | 1799 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 1800 | ort->dst.dev, 0); |
1da177e4 LT |
1801 | |
1802 | if (rt) { | |
d8d1f30b CG |
1803 | rt->dst.input = ort->dst.input; |
1804 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1805 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1806 | |
4e3fd7a0 | 1807 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1808 | rt->rt6i_dst.plen = 128; |
defb3519 | 1809 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1810 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1811 | rt->rt6i_idev = ort->rt6i_idev; |
1812 | if (rt->rt6i_idev) | |
1813 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1814 | rt->dst.lastuse = jiffies; |
d1918542 | 1815 | rt->dst.expires = 0; |
1da177e4 | 1816 | |
4e3fd7a0 | 1817 | rt->rt6i_gateway = ort->rt6i_gateway; |
1da177e4 LT |
1818 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
1819 | rt->rt6i_metric = 0; | |
1820 | ||
1da177e4 LT |
1821 | #ifdef CONFIG_IPV6_SUBTREES |
1822 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1823 | #endif | |
0f6c6392 | 1824 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1825 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1826 | } |
1827 | return rt; | |
1828 | } | |
1829 | ||
70ceb4f5 | 1830 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1831 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1832 | const struct in6_addr *prefix, int prefixlen, |
1833 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1834 | { |
1835 | struct fib6_node *fn; | |
1836 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1837 | struct fib6_table *table; |
1838 | ||
efa2cea0 | 1839 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1840 | if (!table) |
c71099ac | 1841 | return NULL; |
70ceb4f5 | 1842 | |
c71099ac TG |
1843 | write_lock_bh(&table->tb6_lock); |
1844 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1845 | if (!fn) |
1846 | goto out; | |
1847 | ||
d8d1f30b | 1848 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1849 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1850 | continue; |
1851 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1852 | continue; | |
1853 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1854 | continue; | |
d8d1f30b | 1855 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1856 | break; |
1857 | } | |
1858 | out: | |
c71099ac | 1859 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1860 | return rt; |
1861 | } | |
1862 | ||
efa2cea0 | 1863 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1864 | const struct in6_addr *prefix, int prefixlen, |
1865 | const struct in6_addr *gwaddr, int ifindex, | |
70ceb4f5 YH |
1866 | unsigned pref) |
1867 | { | |
86872cb5 TG |
1868 | struct fib6_config cfg = { |
1869 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1870 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1871 | .fc_ifindex = ifindex, |
1872 | .fc_dst_len = prefixlen, | |
1873 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1874 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1875 | .fc_nlinfo.pid = 0, |
1876 | .fc_nlinfo.nlh = NULL, | |
1877 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1878 | }; |
1879 | ||
4e3fd7a0 AD |
1880 | cfg.fc_dst = *prefix; |
1881 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1882 | |
e317da96 YH |
1883 | /* We should treat it as a default route if prefix length is 0. */ |
1884 | if (!prefixlen) | |
86872cb5 | 1885 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1886 | |
86872cb5 | 1887 | ip6_route_add(&cfg); |
70ceb4f5 | 1888 | |
efa2cea0 | 1889 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1890 | } |
1891 | #endif | |
1892 | ||
b71d1d42 | 1893 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1894 | { |
1da177e4 | 1895 | struct rt6_info *rt; |
c71099ac | 1896 | struct fib6_table *table; |
1da177e4 | 1897 | |
c346dca1 | 1898 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1899 | if (!table) |
c71099ac | 1900 | return NULL; |
1da177e4 | 1901 | |
c71099ac | 1902 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1903 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1904 | if (dev == rt->dst.dev && |
045927ff | 1905 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1906 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1907 | break; | |
1908 | } | |
1909 | if (rt) | |
d8d1f30b | 1910 | dst_hold(&rt->dst); |
c71099ac | 1911 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1912 | return rt; |
1913 | } | |
1914 | ||
b71d1d42 | 1915 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1916 | struct net_device *dev, |
1917 | unsigned int pref) | |
1da177e4 | 1918 | { |
86872cb5 TG |
1919 | struct fib6_config cfg = { |
1920 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1921 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1922 | .fc_ifindex = dev->ifindex, |
1923 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1924 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1925 | .fc_nlinfo.pid = 0, |
1926 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1927 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1928 | }; |
1da177e4 | 1929 | |
4e3fd7a0 | 1930 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1931 | |
86872cb5 | 1932 | ip6_route_add(&cfg); |
1da177e4 | 1933 | |
1da177e4 LT |
1934 | return rt6_get_dflt_router(gwaddr, dev); |
1935 | } | |
1936 | ||
7b4da532 | 1937 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1938 | { |
1939 | struct rt6_info *rt; | |
c71099ac TG |
1940 | struct fib6_table *table; |
1941 | ||
1942 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1943 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1944 | if (!table) |
c71099ac | 1945 | return; |
1da177e4 LT |
1946 | |
1947 | restart: | |
c71099ac | 1948 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1949 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1950 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1951 | dst_hold(&rt->dst); |
c71099ac | 1952 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1953 | ip6_del_rt(rt); |
1da177e4 LT |
1954 | goto restart; |
1955 | } | |
1956 | } | |
c71099ac | 1957 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1958 | } |
1959 | ||
5578689a DL |
1960 | static void rtmsg_to_fib6_config(struct net *net, |
1961 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1962 | struct fib6_config *cfg) |
1963 | { | |
1964 | memset(cfg, 0, sizeof(*cfg)); | |
1965 | ||
1966 | cfg->fc_table = RT6_TABLE_MAIN; | |
1967 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1968 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1969 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1970 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1971 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1972 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1973 | ||
5578689a | 1974 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1975 | |
4e3fd7a0 AD |
1976 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1977 | cfg->fc_src = rtmsg->rtmsg_src; | |
1978 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1979 | } |
1980 | ||
5578689a | 1981 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1982 | { |
86872cb5 | 1983 | struct fib6_config cfg; |
1da177e4 LT |
1984 | struct in6_rtmsg rtmsg; |
1985 | int err; | |
1986 | ||
1987 | switch(cmd) { | |
1988 | case SIOCADDRT: /* Add a route */ | |
1989 | case SIOCDELRT: /* Delete a route */ | |
1990 | if (!capable(CAP_NET_ADMIN)) | |
1991 | return -EPERM; | |
1992 | err = copy_from_user(&rtmsg, arg, | |
1993 | sizeof(struct in6_rtmsg)); | |
1994 | if (err) | |
1995 | return -EFAULT; | |
86872cb5 | 1996 | |
5578689a | 1997 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1998 | |
1da177e4 LT |
1999 | rtnl_lock(); |
2000 | switch (cmd) { | |
2001 | case SIOCADDRT: | |
86872cb5 | 2002 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2003 | break; |
2004 | case SIOCDELRT: | |
86872cb5 | 2005 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2006 | break; |
2007 | default: | |
2008 | err = -EINVAL; | |
2009 | } | |
2010 | rtnl_unlock(); | |
2011 | ||
2012 | return err; | |
3ff50b79 | 2013 | } |
1da177e4 LT |
2014 | |
2015 | return -EINVAL; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * Drop the packet on the floor | |
2020 | */ | |
2021 | ||
d5fdd6ba | 2022 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2023 | { |
612f09e8 | 2024 | int type; |
adf30907 | 2025 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2026 | switch (ipstats_mib_noroutes) { |
2027 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2028 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2029 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2030 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2031 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2032 | break; |
2033 | } | |
2034 | /* FALLTHROUGH */ | |
2035 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2036 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2037 | ipstats_mib_noroutes); | |
612f09e8 YH |
2038 | break; |
2039 | } | |
3ffe533c | 2040 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2041 | kfree_skb(skb); |
2042 | return 0; | |
2043 | } | |
2044 | ||
9ce8ade0 TG |
2045 | static int ip6_pkt_discard(struct sk_buff *skb) |
2046 | { | |
612f09e8 | 2047 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2048 | } |
2049 | ||
20380731 | 2050 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2051 | { |
adf30907 | 2052 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2053 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2054 | } |
2055 | ||
6723ab54 DM |
2056 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2057 | ||
9ce8ade0 TG |
2058 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2059 | { | |
612f09e8 | 2060 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2061 | } |
2062 | ||
2063 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2064 | { | |
adf30907 | 2065 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2066 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2067 | } |
2068 | ||
6723ab54 DM |
2069 | #endif |
2070 | ||
1da177e4 LT |
2071 | /* |
2072 | * Allocate a dst for local (unicast / anycast) address. | |
2073 | */ | |
2074 | ||
2075 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2076 | const struct in6_addr *addr, | |
8f031519 | 2077 | bool anycast) |
1da177e4 | 2078 | { |
c346dca1 | 2079 | struct net *net = dev_net(idev->dev); |
5c1e6aa3 | 2080 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 2081 | net->loopback_dev, 0); |
f83c7790 | 2082 | int err; |
1da177e4 | 2083 | |
38308473 | 2084 | if (!rt) { |
40385653 BG |
2085 | if (net_ratelimit()) |
2086 | pr_warning("IPv6: Maximum number of routes reached," | |
2087 | " consider increasing route/max_size.\n"); | |
1da177e4 | 2088 | return ERR_PTR(-ENOMEM); |
40385653 | 2089 | } |
1da177e4 | 2090 | |
1da177e4 LT |
2091 | in6_dev_hold(idev); |
2092 | ||
11d53b49 | 2093 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2094 | rt->dst.input = ip6_input; |
2095 | rt->dst.output = ip6_output; | |
1da177e4 | 2096 | rt->rt6i_idev = idev; |
d8d1f30b | 2097 | rt->dst.obsolete = -1; |
1da177e4 LT |
2098 | |
2099 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2100 | if (anycast) |
2101 | rt->rt6i_flags |= RTF_ANYCAST; | |
2102 | else | |
1da177e4 | 2103 | rt->rt6i_flags |= RTF_LOCAL; |
8ade06c6 | 2104 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
f83c7790 | 2105 | if (err) { |
d8d1f30b | 2106 | dst_free(&rt->dst); |
f83c7790 | 2107 | return ERR_PTR(err); |
1da177e4 LT |
2108 | } |
2109 | ||
4e3fd7a0 | 2110 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2111 | rt->rt6i_dst.plen = 128; |
5578689a | 2112 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2113 | |
d8d1f30b | 2114 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2115 | |
2116 | return rt; | |
2117 | } | |
2118 | ||
c3968a85 DW |
2119 | int ip6_route_get_saddr(struct net *net, |
2120 | struct rt6_info *rt, | |
b71d1d42 | 2121 | const struct in6_addr *daddr, |
c3968a85 DW |
2122 | unsigned int prefs, |
2123 | struct in6_addr *saddr) | |
2124 | { | |
2125 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2126 | int err = 0; | |
2127 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2128 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2129 | else |
2130 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2131 | daddr, prefs, saddr); | |
2132 | return err; | |
2133 | } | |
2134 | ||
2135 | /* remove deleted ip from prefsrc entries */ | |
2136 | struct arg_dev_net_ip { | |
2137 | struct net_device *dev; | |
2138 | struct net *net; | |
2139 | struct in6_addr *addr; | |
2140 | }; | |
2141 | ||
2142 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2143 | { | |
2144 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2145 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2146 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2147 | ||
d1918542 | 2148 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2149 | rt != net->ipv6.ip6_null_entry && |
2150 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2151 | /* remove prefsrc entry */ | |
2152 | rt->rt6i_prefsrc.plen = 0; | |
2153 | } | |
2154 | return 0; | |
2155 | } | |
2156 | ||
2157 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2158 | { | |
2159 | struct net *net = dev_net(ifp->idev->dev); | |
2160 | struct arg_dev_net_ip adni = { | |
2161 | .dev = ifp->idev->dev, | |
2162 | .net = net, | |
2163 | .addr = &ifp->addr, | |
2164 | }; | |
2165 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2166 | } | |
2167 | ||
8ed67789 DL |
2168 | struct arg_dev_net { |
2169 | struct net_device *dev; | |
2170 | struct net *net; | |
2171 | }; | |
2172 | ||
1da177e4 LT |
2173 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2174 | { | |
bc3ef660 | 2175 | const struct arg_dev_net *adn = arg; |
2176 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2177 | |
d1918542 | 2178 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2179 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2180 | return -1; |
c159d30c | 2181 | |
1da177e4 LT |
2182 | return 0; |
2183 | } | |
2184 | ||
f3db4851 | 2185 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2186 | { |
8ed67789 DL |
2187 | struct arg_dev_net adn = { |
2188 | .dev = dev, | |
2189 | .net = net, | |
2190 | }; | |
2191 | ||
2192 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2193 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2194 | } |
2195 | ||
2196 | struct rt6_mtu_change_arg | |
2197 | { | |
2198 | struct net_device *dev; | |
2199 | unsigned mtu; | |
2200 | }; | |
2201 | ||
2202 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2203 | { | |
2204 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2205 | struct inet6_dev *idev; | |
2206 | ||
2207 | /* In IPv6 pmtu discovery is not optional, | |
2208 | so that RTAX_MTU lock cannot disable it. | |
2209 | We still use this lock to block changes | |
2210 | caused by addrconf/ndisc. | |
2211 | */ | |
2212 | ||
2213 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2214 | if (!idev) |
1da177e4 LT |
2215 | return 0; |
2216 | ||
2217 | /* For administrative MTU increase, there is no way to discover | |
2218 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2219 | Since RFC 1981 doesn't include administrative MTU increase | |
2220 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2221 | */ | |
2222 | /* | |
2223 | If new MTU is less than route PMTU, this new MTU will be the | |
2224 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2225 | decreases; if new MTU is greater than route PMTU, and the | |
2226 | old MTU is the lowest MTU in the path, update the route PMTU | |
2227 | to reflect the increase. In this case if the other nodes' MTU | |
2228 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2229 | PMTU discouvery. | |
2230 | */ | |
d1918542 | 2231 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2232 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2233 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2234 | (dst_mtu(&rt->dst) < arg->mtu && | |
2235 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2236 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2237 | } |
1da177e4 LT |
2238 | return 0; |
2239 | } | |
2240 | ||
2241 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2242 | { | |
c71099ac TG |
2243 | struct rt6_mtu_change_arg arg = { |
2244 | .dev = dev, | |
2245 | .mtu = mtu, | |
2246 | }; | |
1da177e4 | 2247 | |
c346dca1 | 2248 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2249 | } |
2250 | ||
ef7c79ed | 2251 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2252 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2253 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2254 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2255 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2256 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2257 | }; | |
2258 | ||
2259 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2260 | struct fib6_config *cfg) | |
1da177e4 | 2261 | { |
86872cb5 TG |
2262 | struct rtmsg *rtm; |
2263 | struct nlattr *tb[RTA_MAX+1]; | |
2264 | int err; | |
1da177e4 | 2265 | |
86872cb5 TG |
2266 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2267 | if (err < 0) | |
2268 | goto errout; | |
1da177e4 | 2269 | |
86872cb5 TG |
2270 | err = -EINVAL; |
2271 | rtm = nlmsg_data(nlh); | |
2272 | memset(cfg, 0, sizeof(*cfg)); | |
2273 | ||
2274 | cfg->fc_table = rtm->rtm_table; | |
2275 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2276 | cfg->fc_src_len = rtm->rtm_src_len; | |
2277 | cfg->fc_flags = RTF_UP; | |
2278 | cfg->fc_protocol = rtm->rtm_protocol; | |
2279 | ||
2280 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2281 | cfg->fc_flags |= RTF_REJECT; | |
2282 | ||
ab79ad14 MŻ |
2283 | if (rtm->rtm_type == RTN_LOCAL) |
2284 | cfg->fc_flags |= RTF_LOCAL; | |
2285 | ||
86872cb5 TG |
2286 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2287 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2288 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2289 | |
2290 | if (tb[RTA_GATEWAY]) { | |
2291 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2292 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2293 | } |
86872cb5 TG |
2294 | |
2295 | if (tb[RTA_DST]) { | |
2296 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2297 | ||
2298 | if (nla_len(tb[RTA_DST]) < plen) | |
2299 | goto errout; | |
2300 | ||
2301 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2302 | } |
86872cb5 TG |
2303 | |
2304 | if (tb[RTA_SRC]) { | |
2305 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2306 | ||
2307 | if (nla_len(tb[RTA_SRC]) < plen) | |
2308 | goto errout; | |
2309 | ||
2310 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2311 | } |
86872cb5 | 2312 | |
c3968a85 DW |
2313 | if (tb[RTA_PREFSRC]) |
2314 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2315 | ||
86872cb5 TG |
2316 | if (tb[RTA_OIF]) |
2317 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2318 | ||
2319 | if (tb[RTA_PRIORITY]) | |
2320 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2321 | ||
2322 | if (tb[RTA_METRICS]) { | |
2323 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2324 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2325 | } |
86872cb5 TG |
2326 | |
2327 | if (tb[RTA_TABLE]) | |
2328 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2329 | ||
2330 | err = 0; | |
2331 | errout: | |
2332 | return err; | |
1da177e4 LT |
2333 | } |
2334 | ||
c127ea2c | 2335 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2336 | { |
86872cb5 TG |
2337 | struct fib6_config cfg; |
2338 | int err; | |
1da177e4 | 2339 | |
86872cb5 TG |
2340 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2341 | if (err < 0) | |
2342 | return err; | |
2343 | ||
2344 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2345 | } |
2346 | ||
c127ea2c | 2347 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2348 | { |
86872cb5 TG |
2349 | struct fib6_config cfg; |
2350 | int err; | |
1da177e4 | 2351 | |
86872cb5 TG |
2352 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2353 | if (err < 0) | |
2354 | return err; | |
2355 | ||
2356 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2357 | } |
2358 | ||
339bf98f TG |
2359 | static inline size_t rt6_nlmsg_size(void) |
2360 | { | |
2361 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2362 | + nla_total_size(16) /* RTA_SRC */ | |
2363 | + nla_total_size(16) /* RTA_DST */ | |
2364 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2365 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2366 | + nla_total_size(4) /* RTA_TABLE */ | |
2367 | + nla_total_size(4) /* RTA_IIF */ | |
2368 | + nla_total_size(4) /* RTA_OIF */ | |
2369 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2370 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2371 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2372 | } | |
2373 | ||
191cd582 BH |
2374 | static int rt6_fill_node(struct net *net, |
2375 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2376 | struct in6_addr *dst, struct in6_addr *src, |
2377 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2378 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 2379 | { |
346f870b | 2380 | const struct inet_peer *peer; |
1da177e4 | 2381 | struct rtmsg *rtm; |
2d7202bf | 2382 | struct nlmsghdr *nlh; |
e3703b3d | 2383 | long expires; |
9e762a4a | 2384 | u32 table; |
f2c31e32 | 2385 | struct neighbour *n; |
346f870b | 2386 | u32 ts, tsage; |
1da177e4 LT |
2387 | |
2388 | if (prefix) { /* user wants prefix routes only */ | |
2389 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2390 | /* success since this is not a prefix route */ | |
2391 | return 1; | |
2392 | } | |
2393 | } | |
2394 | ||
2d7202bf | 2395 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
38308473 | 2396 | if (!nlh) |
26932566 | 2397 | return -EMSGSIZE; |
2d7202bf TG |
2398 | |
2399 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2400 | rtm->rtm_family = AF_INET6; |
2401 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2402 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2403 | rtm->rtm_tos = 0; | |
c71099ac | 2404 | if (rt->rt6i_table) |
9e762a4a | 2405 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2406 | else |
9e762a4a PM |
2407 | table = RT6_TABLE_UNSPEC; |
2408 | rtm->rtm_table = table; | |
2d7202bf | 2409 | NLA_PUT_U32(skb, RTA_TABLE, table); |
38308473 | 2410 | if (rt->rt6i_flags & RTF_REJECT) |
1da177e4 | 2411 | rtm->rtm_type = RTN_UNREACHABLE; |
38308473 | 2412 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2413 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2414 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2415 | rtm->rtm_type = RTN_LOCAL; |
2416 | else | |
2417 | rtm->rtm_type = RTN_UNICAST; | |
2418 | rtm->rtm_flags = 0; | |
2419 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2420 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2421 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 LT |
2422 | rtm->rtm_protocol = RTPROT_REDIRECT; |
2423 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2424 | rtm->rtm_protocol = RTPROT_KERNEL; | |
38308473 | 2425 | else if (rt->rt6i_flags & RTF_DEFAULT) |
1da177e4 LT |
2426 | rtm->rtm_protocol = RTPROT_RA; |
2427 | ||
38308473 | 2428 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2429 | rtm->rtm_flags |= RTM_F_CLONED; |
2430 | ||
2431 | if (dst) { | |
2d7202bf | 2432 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2433 | rtm->rtm_dst_len = 128; |
1da177e4 | 2434 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2435 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2436 | #ifdef CONFIG_IPV6_SUBTREES |
2437 | if (src) { | |
2d7202bf | 2438 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2439 | rtm->rtm_src_len = 128; |
1da177e4 | 2440 | } else if (rtm->rtm_src_len) |
2d7202bf | 2441 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2442 | #endif |
7bc570c8 YH |
2443 | if (iif) { |
2444 | #ifdef CONFIG_IPV6_MROUTE | |
2445 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2446 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2447 | if (err <= 0) { |
2448 | if (!nowait) { | |
2449 | if (err == 0) | |
2450 | return 0; | |
2451 | goto nla_put_failure; | |
2452 | } else { | |
2453 | if (err == -EMSGSIZE) | |
2454 | goto nla_put_failure; | |
2455 | } | |
2456 | } | |
2457 | } else | |
2458 | #endif | |
2459 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2460 | } else if (dst) { | |
1da177e4 | 2461 | struct in6_addr saddr_buf; |
c3968a85 | 2462 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0) |
2d7202bf | 2463 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2464 | } |
2d7202bf | 2465 | |
c3968a85 DW |
2466 | if (rt->rt6i_prefsrc.plen) { |
2467 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2468 | saddr_buf = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2469 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
2470 | } | |
2471 | ||
defb3519 | 2472 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2473 | goto nla_put_failure; |
2474 | ||
f2c31e32 | 2475 | rcu_read_lock(); |
27217455 | 2476 | n = dst_get_neighbour_noref(&rt->dst); |
94f826b8 ED |
2477 | if (n) { |
2478 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) { | |
2479 | rcu_read_unlock(); | |
2480 | goto nla_put_failure; | |
2481 | } | |
2482 | } | |
f2c31e32 | 2483 | rcu_read_unlock(); |
2d7202bf | 2484 | |
d8d1f30b | 2485 | if (rt->dst.dev) |
d1918542 | 2486 | NLA_PUT_U32(skb, RTA_OIF, rt->dst.dev->ifindex); |
2d7202bf TG |
2487 | |
2488 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2489 | |
36e3deae YH |
2490 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2491 | expires = 0; | |
d1918542 DM |
2492 | else if (rt->dst.expires - jiffies < INT_MAX) |
2493 | expires = rt->dst.expires - jiffies; | |
36e3deae YH |
2494 | else |
2495 | expires = INT_MAX; | |
69cdf8f9 | 2496 | |
346f870b DM |
2497 | peer = rt->rt6i_peer; |
2498 | ts = tsage = 0; | |
2499 | if (peer && peer->tcp_ts_stamp) { | |
2500 | ts = peer->tcp_ts; | |
2501 | tsage = get_seconds() - peer->tcp_ts_stamp; | |
2502 | } | |
2503 | ||
2504 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage, | |
d8d1f30b | 2505 | expires, rt->dst.error) < 0) |
e3703b3d | 2506 | goto nla_put_failure; |
2d7202bf TG |
2507 | |
2508 | return nlmsg_end(skb, nlh); | |
2509 | ||
2510 | nla_put_failure: | |
26932566 PM |
2511 | nlmsg_cancel(skb, nlh); |
2512 | return -EMSGSIZE; | |
1da177e4 LT |
2513 | } |
2514 | ||
1b43af54 | 2515 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2516 | { |
2517 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2518 | int prefix; | |
2519 | ||
2d7202bf TG |
2520 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2521 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2522 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2523 | } else | |
2524 | prefix = 0; | |
2525 | ||
191cd582 BH |
2526 | return rt6_fill_node(arg->net, |
2527 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2528 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2529 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2530 | } |
2531 | ||
c127ea2c | 2532 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2533 | { |
3b1e0a65 | 2534 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2535 | struct nlattr *tb[RTA_MAX+1]; |
2536 | struct rt6_info *rt; | |
1da177e4 | 2537 | struct sk_buff *skb; |
ab364a6f | 2538 | struct rtmsg *rtm; |
4c9483b2 | 2539 | struct flowi6 fl6; |
ab364a6f | 2540 | int err, iif = 0; |
1da177e4 | 2541 | |
ab364a6f TG |
2542 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2543 | if (err < 0) | |
2544 | goto errout; | |
1da177e4 | 2545 | |
ab364a6f | 2546 | err = -EINVAL; |
4c9483b2 | 2547 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2548 | |
ab364a6f TG |
2549 | if (tb[RTA_SRC]) { |
2550 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2551 | goto errout; | |
2552 | ||
4e3fd7a0 | 2553 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2554 | } |
2555 | ||
2556 | if (tb[RTA_DST]) { | |
2557 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2558 | goto errout; | |
2559 | ||
4e3fd7a0 | 2560 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2561 | } |
2562 | ||
2563 | if (tb[RTA_IIF]) | |
2564 | iif = nla_get_u32(tb[RTA_IIF]); | |
2565 | ||
2566 | if (tb[RTA_OIF]) | |
4c9483b2 | 2567 | fl6.flowi6_oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2568 | |
2569 | if (iif) { | |
2570 | struct net_device *dev; | |
5578689a | 2571 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2572 | if (!dev) { |
2573 | err = -ENODEV; | |
ab364a6f | 2574 | goto errout; |
1da177e4 LT |
2575 | } |
2576 | } | |
2577 | ||
ab364a6f | 2578 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2579 | if (!skb) { |
ab364a6f TG |
2580 | err = -ENOBUFS; |
2581 | goto errout; | |
2582 | } | |
1da177e4 | 2583 | |
ab364a6f TG |
2584 | /* Reserve room for dummy headers, this skb can pass |
2585 | through good chunk of routing engine. | |
2586 | */ | |
459a98ed | 2587 | skb_reset_mac_header(skb); |
ab364a6f | 2588 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2589 | |
4c9483b2 | 2590 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl6); |
d8d1f30b | 2591 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2592 | |
4c9483b2 | 2593 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2594 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2595 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2596 | if (err < 0) { |
ab364a6f TG |
2597 | kfree_skb(skb); |
2598 | goto errout; | |
1da177e4 LT |
2599 | } |
2600 | ||
5578689a | 2601 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2602 | errout: |
1da177e4 | 2603 | return err; |
1da177e4 LT |
2604 | } |
2605 | ||
86872cb5 | 2606 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2607 | { |
2608 | struct sk_buff *skb; | |
5578689a | 2609 | struct net *net = info->nl_net; |
528c4ceb DL |
2610 | u32 seq; |
2611 | int err; | |
2612 | ||
2613 | err = -ENOBUFS; | |
38308473 | 2614 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2615 | |
339bf98f | 2616 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2617 | if (!skb) |
21713ebc TG |
2618 | goto errout; |
2619 | ||
191cd582 | 2620 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2621 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2622 | if (err < 0) { |
2623 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2624 | WARN_ON(err == -EMSGSIZE); | |
2625 | kfree_skb(skb); | |
2626 | goto errout; | |
2627 | } | |
1ce85fe4 PNA |
2628 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2629 | info->nlh, gfp_any()); | |
2630 | return; | |
21713ebc TG |
2631 | errout: |
2632 | if (err < 0) | |
5578689a | 2633 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2634 | } |
2635 | ||
8ed67789 DL |
2636 | static int ip6_route_dev_notify(struct notifier_block *this, |
2637 | unsigned long event, void *data) | |
2638 | { | |
2639 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2640 | struct net *net = dev_net(dev); |
8ed67789 DL |
2641 | |
2642 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2643 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2644 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2645 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2646 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2647 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2648 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2649 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2650 | #endif | |
2651 | } | |
2652 | ||
2653 | return NOTIFY_OK; | |
2654 | } | |
2655 | ||
1da177e4 LT |
2656 | /* |
2657 | * /proc | |
2658 | */ | |
2659 | ||
2660 | #ifdef CONFIG_PROC_FS | |
2661 | ||
1da177e4 LT |
2662 | struct rt6_proc_arg |
2663 | { | |
2664 | char *buffer; | |
2665 | int offset; | |
2666 | int length; | |
2667 | int skip; | |
2668 | int len; | |
2669 | }; | |
2670 | ||
2671 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2672 | { | |
33120b30 | 2673 | struct seq_file *m = p_arg; |
69cce1d1 | 2674 | struct neighbour *n; |
1da177e4 | 2675 | |
4b7a4274 | 2676 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2677 | |
2678 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2679 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2680 | #else |
33120b30 | 2681 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2682 | #endif |
f2c31e32 | 2683 | rcu_read_lock(); |
27217455 | 2684 | n = dst_get_neighbour_noref(&rt->dst); |
69cce1d1 DM |
2685 | if (n) { |
2686 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2687 | } else { |
33120b30 | 2688 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2689 | } |
f2c31e32 | 2690 | rcu_read_unlock(); |
33120b30 | 2691 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2692 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2693 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2694 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2695 | return 0; |
2696 | } | |
2697 | ||
33120b30 | 2698 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2699 | { |
f3db4851 | 2700 | struct net *net = (struct net *)m->private; |
32b293a5 | 2701 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2702 | return 0; |
2703 | } | |
1da177e4 | 2704 | |
33120b30 AD |
2705 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2706 | { | |
de05c557 | 2707 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2708 | } |
2709 | ||
33120b30 AD |
2710 | static const struct file_operations ipv6_route_proc_fops = { |
2711 | .owner = THIS_MODULE, | |
2712 | .open = ipv6_route_open, | |
2713 | .read = seq_read, | |
2714 | .llseek = seq_lseek, | |
b6fcbdb4 | 2715 | .release = single_release_net, |
33120b30 AD |
2716 | }; |
2717 | ||
1da177e4 LT |
2718 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2719 | { | |
69ddb805 | 2720 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2721 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2722 | net->ipv6.rt6_stats->fib_nodes, |
2723 | net->ipv6.rt6_stats->fib_route_nodes, | |
2724 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2725 | net->ipv6.rt6_stats->fib_rt_entries, | |
2726 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2727 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2728 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2729 | |
2730 | return 0; | |
2731 | } | |
2732 | ||
2733 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2734 | { | |
de05c557 | 2735 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2736 | } |
2737 | ||
9a32144e | 2738 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2739 | .owner = THIS_MODULE, |
2740 | .open = rt6_stats_seq_open, | |
2741 | .read = seq_read, | |
2742 | .llseek = seq_lseek, | |
b6fcbdb4 | 2743 | .release = single_release_net, |
1da177e4 LT |
2744 | }; |
2745 | #endif /* CONFIG_PROC_FS */ | |
2746 | ||
2747 | #ifdef CONFIG_SYSCTL | |
2748 | ||
1da177e4 | 2749 | static |
8d65af78 | 2750 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2751 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2752 | { | |
c486da34 LAG |
2753 | struct net *net; |
2754 | int delay; | |
2755 | if (!write) | |
1da177e4 | 2756 | return -EINVAL; |
c486da34 LAG |
2757 | |
2758 | net = (struct net *)ctl->extra1; | |
2759 | delay = net->ipv6.sysctl.flush_delay; | |
2760 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2761 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2762 | return 0; | |
1da177e4 LT |
2763 | } |
2764 | ||
760f2d01 | 2765 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2766 | { |
1da177e4 | 2767 | .procname = "flush", |
4990509f | 2768 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2769 | .maxlen = sizeof(int), |
89c8b3a1 | 2770 | .mode = 0200, |
6d9f239a | 2771 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2772 | }, |
2773 | { | |
1da177e4 | 2774 | .procname = "gc_thresh", |
9a7ec3a9 | 2775 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2776 | .maxlen = sizeof(int), |
2777 | .mode = 0644, | |
6d9f239a | 2778 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2779 | }, |
2780 | { | |
1da177e4 | 2781 | .procname = "max_size", |
4990509f | 2782 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2783 | .maxlen = sizeof(int), |
2784 | .mode = 0644, | |
6d9f239a | 2785 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2786 | }, |
2787 | { | |
1da177e4 | 2788 | .procname = "gc_min_interval", |
4990509f | 2789 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2790 | .maxlen = sizeof(int), |
2791 | .mode = 0644, | |
6d9f239a | 2792 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2793 | }, |
2794 | { | |
1da177e4 | 2795 | .procname = "gc_timeout", |
4990509f | 2796 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2797 | .maxlen = sizeof(int), |
2798 | .mode = 0644, | |
6d9f239a | 2799 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2800 | }, |
2801 | { | |
1da177e4 | 2802 | .procname = "gc_interval", |
4990509f | 2803 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2804 | .maxlen = sizeof(int), |
2805 | .mode = 0644, | |
6d9f239a | 2806 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2807 | }, |
2808 | { | |
1da177e4 | 2809 | .procname = "gc_elasticity", |
4990509f | 2810 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2811 | .maxlen = sizeof(int), |
2812 | .mode = 0644, | |
f3d3f616 | 2813 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2814 | }, |
2815 | { | |
1da177e4 | 2816 | .procname = "mtu_expires", |
4990509f | 2817 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2818 | .maxlen = sizeof(int), |
2819 | .mode = 0644, | |
6d9f239a | 2820 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2821 | }, |
2822 | { | |
1da177e4 | 2823 | .procname = "min_adv_mss", |
4990509f | 2824 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2825 | .maxlen = sizeof(int), |
2826 | .mode = 0644, | |
f3d3f616 | 2827 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2828 | }, |
2829 | { | |
1da177e4 | 2830 | .procname = "gc_min_interval_ms", |
4990509f | 2831 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2832 | .maxlen = sizeof(int), |
2833 | .mode = 0644, | |
6d9f239a | 2834 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2835 | }, |
f8572d8f | 2836 | { } |
1da177e4 LT |
2837 | }; |
2838 | ||
2c8c1e72 | 2839 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2840 | { |
2841 | struct ctl_table *table; | |
2842 | ||
2843 | table = kmemdup(ipv6_route_table_template, | |
2844 | sizeof(ipv6_route_table_template), | |
2845 | GFP_KERNEL); | |
5ee09105 YH |
2846 | |
2847 | if (table) { | |
2848 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2849 | table[0].extra1 = net; |
86393e52 | 2850 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2851 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2852 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2853 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2854 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2855 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2856 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2857 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2858 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2859 | } |
2860 | ||
760f2d01 DL |
2861 | return table; |
2862 | } | |
1da177e4 LT |
2863 | #endif |
2864 | ||
2c8c1e72 | 2865 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2866 | { |
633d424b | 2867 | int ret = -ENOMEM; |
8ed67789 | 2868 | |
86393e52 AD |
2869 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2870 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2871 | |
fc66f95c ED |
2872 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2873 | goto out_ip6_dst_ops; | |
2874 | ||
8ed67789 DL |
2875 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2876 | sizeof(*net->ipv6.ip6_null_entry), | |
2877 | GFP_KERNEL); | |
2878 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2879 | goto out_ip6_dst_entries; |
d8d1f30b | 2880 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2881 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2882 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2883 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2884 | ip6_template_metrics, true); | |
8ed67789 DL |
2885 | |
2886 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2887 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2888 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2889 | GFP_KERNEL); | |
68fffc67 PZ |
2890 | if (!net->ipv6.ip6_prohibit_entry) |
2891 | goto out_ip6_null_entry; | |
d8d1f30b | 2892 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2893 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2894 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2895 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2896 | ip6_template_metrics, true); | |
8ed67789 DL |
2897 | |
2898 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2899 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2900 | GFP_KERNEL); | |
68fffc67 PZ |
2901 | if (!net->ipv6.ip6_blk_hole_entry) |
2902 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2903 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2904 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2905 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2906 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2907 | ip6_template_metrics, true); | |
8ed67789 DL |
2908 | #endif |
2909 | ||
b339a47c PZ |
2910 | net->ipv6.sysctl.flush_delay = 0; |
2911 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2912 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2913 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2914 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2915 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2916 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2917 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2918 | ||
cdb18761 DL |
2919 | #ifdef CONFIG_PROC_FS |
2920 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2921 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2922 | #endif | |
6891a346 BT |
2923 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2924 | ||
8ed67789 DL |
2925 | ret = 0; |
2926 | out: | |
2927 | return ret; | |
f2fc6a54 | 2928 | |
68fffc67 PZ |
2929 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2930 | out_ip6_prohibit_entry: | |
2931 | kfree(net->ipv6.ip6_prohibit_entry); | |
2932 | out_ip6_null_entry: | |
2933 | kfree(net->ipv6.ip6_null_entry); | |
2934 | #endif | |
fc66f95c ED |
2935 | out_ip6_dst_entries: |
2936 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2937 | out_ip6_dst_ops: |
f2fc6a54 | 2938 | goto out; |
cdb18761 DL |
2939 | } |
2940 | ||
2c8c1e72 | 2941 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2942 | { |
2943 | #ifdef CONFIG_PROC_FS | |
2944 | proc_net_remove(net, "ipv6_route"); | |
2945 | proc_net_remove(net, "rt6_stats"); | |
2946 | #endif | |
8ed67789 DL |
2947 | kfree(net->ipv6.ip6_null_entry); |
2948 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2949 | kfree(net->ipv6.ip6_prohibit_entry); | |
2950 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2951 | #endif | |
41bb78b4 | 2952 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2953 | } |
2954 | ||
2955 | static struct pernet_operations ip6_route_net_ops = { | |
2956 | .init = ip6_route_net_init, | |
2957 | .exit = ip6_route_net_exit, | |
2958 | }; | |
2959 | ||
8ed67789 DL |
2960 | static struct notifier_block ip6_route_dev_notifier = { |
2961 | .notifier_call = ip6_route_dev_notify, | |
2962 | .priority = 0, | |
2963 | }; | |
2964 | ||
433d49c3 | 2965 | int __init ip6_route_init(void) |
1da177e4 | 2966 | { |
433d49c3 DL |
2967 | int ret; |
2968 | ||
9a7ec3a9 DL |
2969 | ret = -ENOMEM; |
2970 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2971 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2972 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2973 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2974 | goto out; |
14e50e57 | 2975 | |
fc66f95c | 2976 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2977 | if (ret) |
bdb3289f | 2978 | goto out_kmem_cache; |
bdb3289f | 2979 | |
fc66f95c ED |
2980 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2981 | if (ret) | |
2982 | goto out_dst_entries; | |
2983 | ||
5dc121e9 AE |
2984 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2985 | ||
8ed67789 DL |
2986 | /* Registering of the loopback is done before this portion of code, |
2987 | * the loopback reference in rt6_info will not be taken, do it | |
2988 | * manually for init_net */ | |
d8d1f30b | 2989 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2990 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2991 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2992 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2993 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2994 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2995 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2996 | #endif | |
433d49c3 DL |
2997 | ret = fib6_init(); |
2998 | if (ret) | |
8ed67789 | 2999 | goto out_register_subsys; |
433d49c3 | 3000 | |
433d49c3 DL |
3001 | ret = xfrm6_init(); |
3002 | if (ret) | |
cdb18761 | 3003 | goto out_fib6_init; |
c35b7e72 | 3004 | |
433d49c3 DL |
3005 | ret = fib6_rules_init(); |
3006 | if (ret) | |
3007 | goto xfrm6_init; | |
7e5449c2 | 3008 | |
433d49c3 | 3009 | ret = -ENOBUFS; |
c7ac8679 GR |
3010 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3011 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3012 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
433d49c3 | 3013 | goto fib6_rules_init; |
c127ea2c | 3014 | |
8ed67789 | 3015 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
3016 | if (ret) |
3017 | goto fib6_rules_init; | |
8ed67789 | 3018 | |
433d49c3 DL |
3019 | out: |
3020 | return ret; | |
3021 | ||
3022 | fib6_rules_init: | |
433d49c3 DL |
3023 | fib6_rules_cleanup(); |
3024 | xfrm6_init: | |
433d49c3 | 3025 | xfrm6_fini(); |
433d49c3 | 3026 | out_fib6_init: |
433d49c3 | 3027 | fib6_gc_cleanup(); |
8ed67789 DL |
3028 | out_register_subsys: |
3029 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
3030 | out_dst_entries: |
3031 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3032 | out_kmem_cache: |
f2fc6a54 | 3033 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3034 | goto out; |
1da177e4 LT |
3035 | } |
3036 | ||
3037 | void ip6_route_cleanup(void) | |
3038 | { | |
8ed67789 | 3039 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 3040 | fib6_rules_cleanup(); |
1da177e4 | 3041 | xfrm6_fini(); |
1da177e4 | 3042 | fib6_gc_cleanup(); |
8ed67789 | 3043 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3044 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3045 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3046 | } |