Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 | 28 | #include <linux/errno.h> |
bc3b2d7f | 29 | #include <linux/export.h> |
1da177e4 LT |
30 | #include <linux/types.h> |
31 | #include <linux/times.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/sockios.h> | |
34 | #include <linux/net.h> | |
35 | #include <linux/route.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/in6.h> | |
7bc570c8 | 38 | #include <linux/mroute6.h> |
1da177e4 | 39 | #include <linux/init.h> |
1da177e4 | 40 | #include <linux/if_arp.h> |
1da177e4 LT |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> | |
5b7c931d | 43 | #include <linux/nsproxy.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
457c4cbc | 45 | #include <net/net_namespace.h> |
1da177e4 LT |
46 | #include <net/snmp.h> |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
55 | #include <net/xfrm.h> | |
8d71740c | 56 | #include <net/netevent.h> |
21713ebc | 57 | #include <net/netlink.h> |
1da177e4 LT |
58 | |
59 | #include <asm/uaccess.h> | |
60 | ||
61 | #ifdef CONFIG_SYSCTL | |
62 | #include <linux/sysctl.h> | |
63 | #endif | |
64 | ||
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 | ||
d3aaeb38 DM |
124 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
125 | { | |
f83c7790 DM |
126 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); |
127 | if (n) | |
128 | return n; | |
129 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
130 | } | |
131 | ||
132 | static int rt6_bind_neighbour(struct rt6_info *rt) | |
133 | { | |
134 | struct neighbour *n = ip6_neigh_lookup(&rt->dst, &rt->rt6i_gateway); | |
135 | if (IS_ERR(n)) | |
136 | return PTR_ERR(n); | |
137 | dst_set_neighbour(&rt->dst, n); | |
138 | ||
139 | return 0; | |
d3aaeb38 DM |
140 | } |
141 | ||
9a7ec3a9 | 142 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 143 | .family = AF_INET6, |
09640e63 | 144 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
145 | .gc = ip6_dst_gc, |
146 | .gc_thresh = 1024, | |
147 | .check = ip6_dst_check, | |
0dbaee3b | 148 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 149 | .mtu = ip6_mtu, |
06582540 | 150 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
151 | .destroy = ip6_dst_destroy, |
152 | .ifdown = ip6_dst_ifdown, | |
153 | .negative_advice = ip6_negative_advice, | |
154 | .link_failure = ip6_link_failure, | |
155 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 156 | .local_out = __ip6_local_out, |
d3aaeb38 | 157 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
158 | }; |
159 | ||
ebb762f2 | 160 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 161 | { |
618f9bc7 SK |
162 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
163 | ||
164 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
165 | } |
166 | ||
14e50e57 DM |
167 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
168 | { | |
169 | } | |
170 | ||
0972ddb2 HB |
171 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
172 | unsigned long old) | |
173 | { | |
174 | return NULL; | |
175 | } | |
176 | ||
14e50e57 DM |
177 | static struct dst_ops ip6_dst_blackhole_ops = { |
178 | .family = AF_INET6, | |
09640e63 | 179 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
180 | .destroy = ip6_dst_destroy, |
181 | .check = ip6_dst_check, | |
ebb762f2 | 182 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 183 | .default_advmss = ip6_default_advmss, |
14e50e57 | 184 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 185 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 186 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
187 | }; |
188 | ||
62fa8a84 DM |
189 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
190 | [RTAX_HOPLIMIT - 1] = 255, | |
191 | }; | |
192 | ||
bdb3289f | 193 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
194 | .dst = { |
195 | .__refcnt = ATOMIC_INIT(1), | |
196 | .__use = 1, | |
197 | .obsolete = -1, | |
198 | .error = -ENETUNREACH, | |
d8d1f30b CG |
199 | .input = ip6_pkt_discard, |
200 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
201 | }, |
202 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 203 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
204 | .rt6i_metric = ~(u32) 0, |
205 | .rt6i_ref = ATOMIC_INIT(1), | |
206 | }; | |
207 | ||
101367c2 TG |
208 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
209 | ||
6723ab54 DM |
210 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
211 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 212 | |
280a34c8 | 213 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
214 | .dst = { |
215 | .__refcnt = ATOMIC_INIT(1), | |
216 | .__use = 1, | |
217 | .obsolete = -1, | |
218 | .error = -EACCES, | |
d8d1f30b CG |
219 | .input = ip6_pkt_prohibit, |
220 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
221 | }, |
222 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 223 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
224 | .rt6i_metric = ~(u32) 0, |
225 | .rt6i_ref = ATOMIC_INIT(1), | |
226 | }; | |
227 | ||
bdb3289f | 228 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
229 | .dst = { |
230 | .__refcnt = ATOMIC_INIT(1), | |
231 | .__use = 1, | |
232 | .obsolete = -1, | |
233 | .error = -EINVAL, | |
d8d1f30b CG |
234 | .input = dst_discard, |
235 | .output = dst_discard, | |
101367c2 TG |
236 | }, |
237 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 238 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
239 | .rt6i_metric = ~(u32) 0, |
240 | .rt6i_ref = ATOMIC_INIT(1), | |
241 | }; | |
242 | ||
243 | #endif | |
244 | ||
1da177e4 | 245 | /* allocate dst with ip6_dst_ops */ |
5c1e6aa3 | 246 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops, |
957c665f DM |
247 | struct net_device *dev, |
248 | int flags) | |
1da177e4 | 249 | { |
957c665f | 250 | struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags); |
cf911662 | 251 | |
38308473 | 252 | if (rt) |
fbe58186 | 253 | memset(&rt->rt6i_table, 0, |
38308473 | 254 | sizeof(*rt) - sizeof(struct dst_entry)); |
cf911662 DM |
255 | |
256 | return rt; | |
1da177e4 LT |
257 | } |
258 | ||
259 | static void ip6_dst_destroy(struct dst_entry *dst) | |
260 | { | |
261 | struct rt6_info *rt = (struct rt6_info *)dst; | |
262 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 263 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 | 264 | |
8e2ec639 YZ |
265 | if (!(rt->dst.flags & DST_HOST)) |
266 | dst_destroy_metrics_generic(dst); | |
267 | ||
38308473 | 268 | if (idev) { |
1da177e4 LT |
269 | rt->rt6i_idev = NULL; |
270 | in6_dev_put(idev); | |
1ab1457c | 271 | } |
b3419363 | 272 | if (peer) { |
b3419363 DM |
273 | rt->rt6i_peer = NULL; |
274 | inet_putpeer(peer); | |
275 | } | |
276 | } | |
277 | ||
6431cbc2 DM |
278 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
279 | ||
280 | static u32 rt6_peer_genid(void) | |
281 | { | |
282 | return atomic_read(&__rt6_peer_genid); | |
283 | } | |
284 | ||
b3419363 DM |
285 | void rt6_bind_peer(struct rt6_info *rt, int create) |
286 | { | |
287 | struct inet_peer *peer; | |
288 | ||
b3419363 DM |
289 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
290 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
291 | inet_putpeer(peer); | |
6431cbc2 DM |
292 | else |
293 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1da177e4 LT |
294 | } |
295 | ||
296 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
297 | int how) | |
298 | { | |
299 | struct rt6_info *rt = (struct rt6_info *)dst; | |
300 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 301 | struct net_device *loopback_dev = |
c346dca1 | 302 | dev_net(dev)->loopback_dev; |
1da177e4 | 303 | |
38308473 | 304 | if (dev != loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 DL |
305 | struct inet6_dev *loopback_idev = |
306 | in6_dev_get(loopback_dev); | |
38308473 | 307 | if (loopback_idev) { |
1da177e4 LT |
308 | rt->rt6i_idev = loopback_idev; |
309 | in6_dev_put(idev); | |
310 | } | |
311 | } | |
312 | } | |
313 | ||
314 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
315 | { | |
a02cec21 | 316 | return (rt->rt6i_flags & RTF_EXPIRES) && |
d1918542 | 317 | time_after(jiffies, rt->dst.expires); |
1da177e4 LT |
318 | } |
319 | ||
b71d1d42 | 320 | static inline int rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 321 | { |
a02cec21 ED |
322 | return ipv6_addr_type(daddr) & |
323 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
324 | } |
325 | ||
1da177e4 | 326 | /* |
c71099ac | 327 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
328 | */ |
329 | ||
8ed67789 DL |
330 | static inline struct rt6_info *rt6_device_match(struct net *net, |
331 | struct rt6_info *rt, | |
b71d1d42 | 332 | const struct in6_addr *saddr, |
1da177e4 | 333 | int oif, |
d420895e | 334 | int flags) |
1da177e4 LT |
335 | { |
336 | struct rt6_info *local = NULL; | |
337 | struct rt6_info *sprt; | |
338 | ||
dd3abc4e YH |
339 | if (!oif && ipv6_addr_any(saddr)) |
340 | goto out; | |
341 | ||
d8d1f30b | 342 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 343 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
344 | |
345 | if (oif) { | |
1da177e4 LT |
346 | if (dev->ifindex == oif) |
347 | return sprt; | |
348 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 349 | if (!sprt->rt6i_idev || |
1da177e4 | 350 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 351 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 352 | continue; |
1ab1457c | 353 | if (local && (!oif || |
1da177e4 LT |
354 | local->rt6i_idev->dev->ifindex == oif)) |
355 | continue; | |
356 | } | |
357 | local = sprt; | |
358 | } | |
dd3abc4e YH |
359 | } else { |
360 | if (ipv6_chk_addr(net, saddr, dev, | |
361 | flags & RT6_LOOKUP_F_IFACE)) | |
362 | return sprt; | |
1da177e4 | 363 | } |
dd3abc4e | 364 | } |
1da177e4 | 365 | |
dd3abc4e | 366 | if (oif) { |
1da177e4 LT |
367 | if (local) |
368 | return local; | |
369 | ||
d420895e | 370 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 371 | return net->ipv6.ip6_null_entry; |
1da177e4 | 372 | } |
dd3abc4e | 373 | out: |
1da177e4 LT |
374 | return rt; |
375 | } | |
376 | ||
27097255 YH |
377 | #ifdef CONFIG_IPV6_ROUTER_PREF |
378 | static void rt6_probe(struct rt6_info *rt) | |
379 | { | |
f2c31e32 | 380 | struct neighbour *neigh; |
27097255 YH |
381 | /* |
382 | * Okay, this does not seem to be appropriate | |
383 | * for now, however, we need to check if it | |
384 | * is really so; aka Router Reachability Probing. | |
385 | * | |
386 | * Router Reachability Probe MUST be rate-limited | |
387 | * to no more than one per minute. | |
388 | */ | |
f2c31e32 | 389 | rcu_read_lock(); |
27217455 | 390 | neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL; |
27097255 | 391 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
f2c31e32 | 392 | goto out; |
27097255 YH |
393 | read_lock_bh(&neigh->lock); |
394 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 395 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
396 | struct in6_addr mcaddr; |
397 | struct in6_addr *target; | |
398 | ||
399 | neigh->updated = jiffies; | |
400 | read_unlock_bh(&neigh->lock); | |
401 | ||
402 | target = (struct in6_addr *)&neigh->primary_key; | |
403 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 404 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 405 | } else { |
27097255 | 406 | read_unlock_bh(&neigh->lock); |
f2c31e32 ED |
407 | } |
408 | out: | |
409 | rcu_read_unlock(); | |
27097255 YH |
410 | } |
411 | #else | |
412 | static inline void rt6_probe(struct rt6_info *rt) | |
413 | { | |
27097255 YH |
414 | } |
415 | #endif | |
416 | ||
1da177e4 | 417 | /* |
554cfb7e | 418 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 419 | */ |
b6f99a21 | 420 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 421 | { |
d1918542 | 422 | struct net_device *dev = rt->dst.dev; |
161980f4 | 423 | if (!oif || dev->ifindex == oif) |
554cfb7e | 424 | return 2; |
161980f4 DM |
425 | if ((dev->flags & IFF_LOOPBACK) && |
426 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
427 | return 1; | |
428 | return 0; | |
554cfb7e | 429 | } |
1da177e4 | 430 | |
b6f99a21 | 431 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 432 | { |
f2c31e32 | 433 | struct neighbour *neigh; |
398bcbeb | 434 | int m; |
f2c31e32 ED |
435 | |
436 | rcu_read_lock(); | |
27217455 | 437 | neigh = dst_get_neighbour_noref(&rt->dst); |
4d0c5911 YH |
438 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
439 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
440 | m = 1; | |
441 | else if (neigh) { | |
554cfb7e YH |
442 | read_lock_bh(&neigh->lock); |
443 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 444 | m = 2; |
398bcbeb YH |
445 | #ifdef CONFIG_IPV6_ROUTER_PREF |
446 | else if (neigh->nud_state & NUD_FAILED) | |
447 | m = 0; | |
448 | #endif | |
449 | else | |
ea73ee23 | 450 | m = 1; |
554cfb7e | 451 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
452 | } else |
453 | m = 0; | |
f2c31e32 | 454 | rcu_read_unlock(); |
554cfb7e | 455 | return m; |
1da177e4 LT |
456 | } |
457 | ||
554cfb7e YH |
458 | static int rt6_score_route(struct rt6_info *rt, int oif, |
459 | int strict) | |
1da177e4 | 460 | { |
4d0c5911 | 461 | int m, n; |
1ab1457c | 462 | |
4d0c5911 | 463 | m = rt6_check_dev(rt, oif); |
77d16f45 | 464 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 465 | return -1; |
ebacaaa0 YH |
466 | #ifdef CONFIG_IPV6_ROUTER_PREF |
467 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
468 | #endif | |
4d0c5911 | 469 | n = rt6_check_neigh(rt); |
557e92ef | 470 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
471 | return -1; |
472 | return m; | |
473 | } | |
474 | ||
f11e6659 DM |
475 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
476 | int *mpri, struct rt6_info *match) | |
554cfb7e | 477 | { |
f11e6659 DM |
478 | int m; |
479 | ||
480 | if (rt6_check_expired(rt)) | |
481 | goto out; | |
482 | ||
483 | m = rt6_score_route(rt, oif, strict); | |
484 | if (m < 0) | |
485 | goto out; | |
486 | ||
487 | if (m > *mpri) { | |
488 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
489 | rt6_probe(match); | |
490 | *mpri = m; | |
491 | match = rt; | |
492 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
493 | rt6_probe(rt); | |
494 | } | |
495 | ||
496 | out: | |
497 | return match; | |
498 | } | |
499 | ||
500 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
501 | struct rt6_info *rr_head, | |
502 | u32 metric, int oif, int strict) | |
503 | { | |
504 | struct rt6_info *rt, *match; | |
554cfb7e | 505 | int mpri = -1; |
1da177e4 | 506 | |
f11e6659 DM |
507 | match = NULL; |
508 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 509 | rt = rt->dst.rt6_next) |
f11e6659 DM |
510 | match = find_match(rt, oif, strict, &mpri, match); |
511 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 512 | rt = rt->dst.rt6_next) |
f11e6659 | 513 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 514 | |
f11e6659 DM |
515 | return match; |
516 | } | |
1da177e4 | 517 | |
f11e6659 DM |
518 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
519 | { | |
520 | struct rt6_info *match, *rt0; | |
8ed67789 | 521 | struct net *net; |
1da177e4 | 522 | |
f11e6659 DM |
523 | rt0 = fn->rr_ptr; |
524 | if (!rt0) | |
525 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 526 | |
f11e6659 | 527 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 528 | |
554cfb7e | 529 | if (!match && |
f11e6659 | 530 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 531 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 532 | |
554cfb7e | 533 | /* no entries matched; do round-robin */ |
f11e6659 DM |
534 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
535 | next = fn->leaf; | |
536 | ||
537 | if (next != rt0) | |
538 | fn->rr_ptr = next; | |
1da177e4 | 539 | } |
1da177e4 | 540 | |
d1918542 | 541 | net = dev_net(rt0->dst.dev); |
a02cec21 | 542 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
543 | } |
544 | ||
70ceb4f5 YH |
545 | #ifdef CONFIG_IPV6_ROUTE_INFO |
546 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 547 | const struct in6_addr *gwaddr) |
70ceb4f5 | 548 | { |
c346dca1 | 549 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
550 | struct route_info *rinfo = (struct route_info *) opt; |
551 | struct in6_addr prefix_buf, *prefix; | |
552 | unsigned int pref; | |
4bed72e4 | 553 | unsigned long lifetime; |
70ceb4f5 YH |
554 | struct rt6_info *rt; |
555 | ||
556 | if (len < sizeof(struct route_info)) { | |
557 | return -EINVAL; | |
558 | } | |
559 | ||
560 | /* Sanity check for prefix_len and length */ | |
561 | if (rinfo->length > 3) { | |
562 | return -EINVAL; | |
563 | } else if (rinfo->prefix_len > 128) { | |
564 | return -EINVAL; | |
565 | } else if (rinfo->prefix_len > 64) { | |
566 | if (rinfo->length < 2) { | |
567 | return -EINVAL; | |
568 | } | |
569 | } else if (rinfo->prefix_len > 0) { | |
570 | if (rinfo->length < 1) { | |
571 | return -EINVAL; | |
572 | } | |
573 | } | |
574 | ||
575 | pref = rinfo->route_pref; | |
576 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 577 | return -EINVAL; |
70ceb4f5 | 578 | |
4bed72e4 | 579 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
580 | |
581 | if (rinfo->length == 3) | |
582 | prefix = (struct in6_addr *)rinfo->prefix; | |
583 | else { | |
584 | /* this function is safe */ | |
585 | ipv6_addr_prefix(&prefix_buf, | |
586 | (struct in6_addr *)rinfo->prefix, | |
587 | rinfo->prefix_len); | |
588 | prefix = &prefix_buf; | |
589 | } | |
590 | ||
efa2cea0 DL |
591 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
592 | dev->ifindex); | |
70ceb4f5 YH |
593 | |
594 | if (rt && !lifetime) { | |
e0a1ad73 | 595 | ip6_del_rt(rt); |
70ceb4f5 YH |
596 | rt = NULL; |
597 | } | |
598 | ||
599 | if (!rt && lifetime) | |
efa2cea0 | 600 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
601 | pref); |
602 | else if (rt) | |
603 | rt->rt6i_flags = RTF_ROUTEINFO | | |
604 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
605 | ||
606 | if (rt) { | |
4bed72e4 | 607 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
608 | rt->rt6i_flags &= ~RTF_EXPIRES; |
609 | } else { | |
d1918542 | 610 | rt->dst.expires = jiffies + HZ * lifetime; |
70ceb4f5 YH |
611 | rt->rt6i_flags |= RTF_EXPIRES; |
612 | } | |
d8d1f30b | 613 | dst_release(&rt->dst); |
70ceb4f5 YH |
614 | } |
615 | return 0; | |
616 | } | |
617 | #endif | |
618 | ||
8ed67789 | 619 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 620 | do { \ |
8ed67789 | 621 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 622 | struct fib6_node *pn; \ |
e0eda7bb | 623 | while (1) { \ |
982f56f3 YH |
624 | if (fn->fn_flags & RTN_TL_ROOT) \ |
625 | goto out; \ | |
626 | pn = fn->parent; \ | |
627 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 628 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
629 | else \ |
630 | fn = pn; \ | |
631 | if (fn->fn_flags & RTN_RTINFO) \ | |
632 | goto restart; \ | |
c71099ac | 633 | } \ |
c71099ac | 634 | } \ |
38308473 | 635 | } while (0) |
c71099ac | 636 | |
8ed67789 DL |
637 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
638 | struct fib6_table *table, | |
4c9483b2 | 639 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
640 | { |
641 | struct fib6_node *fn; | |
642 | struct rt6_info *rt; | |
643 | ||
c71099ac | 644 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 645 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
646 | restart: |
647 | rt = fn->leaf; | |
4c9483b2 DM |
648 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
649 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 650 | out: |
d8d1f30b | 651 | dst_use(&rt->dst, jiffies); |
c71099ac | 652 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
653 | return rt; |
654 | ||
655 | } | |
656 | ||
ea6e574e FW |
657 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
658 | int flags) | |
659 | { | |
660 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
663 | ||
9acd9f3a YH |
664 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
665 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 666 | { |
4c9483b2 DM |
667 | struct flowi6 fl6 = { |
668 | .flowi6_oif = oif, | |
669 | .daddr = *daddr, | |
c71099ac TG |
670 | }; |
671 | struct dst_entry *dst; | |
77d16f45 | 672 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 673 | |
adaa70bb | 674 | if (saddr) { |
4c9483b2 | 675 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
676 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
677 | } | |
678 | ||
4c9483b2 | 679 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
680 | if (dst->error == 0) |
681 | return (struct rt6_info *) dst; | |
682 | ||
683 | dst_release(dst); | |
684 | ||
1da177e4 LT |
685 | return NULL; |
686 | } | |
687 | ||
7159039a YH |
688 | EXPORT_SYMBOL(rt6_lookup); |
689 | ||
c71099ac | 690 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
691 | It takes new route entry, the addition fails by any reason the |
692 | route is freed. In any case, if caller does not hold it, it may | |
693 | be destroyed. | |
694 | */ | |
695 | ||
86872cb5 | 696 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
697 | { |
698 | int err; | |
c71099ac | 699 | struct fib6_table *table; |
1da177e4 | 700 | |
c71099ac TG |
701 | table = rt->rt6i_table; |
702 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 703 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 704 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
705 | |
706 | return err; | |
707 | } | |
708 | ||
40e22e8f TG |
709 | int ip6_ins_rt(struct rt6_info *rt) |
710 | { | |
4d1169c1 | 711 | struct nl_info info = { |
d1918542 | 712 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 713 | }; |
528c4ceb | 714 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
715 | } |
716 | ||
21efcfa0 ED |
717 | static struct rt6_info *rt6_alloc_cow(const struct rt6_info *ort, |
718 | const struct in6_addr *daddr, | |
b71d1d42 | 719 | const struct in6_addr *saddr) |
1da177e4 | 720 | { |
1da177e4 LT |
721 | struct rt6_info *rt; |
722 | ||
723 | /* | |
724 | * Clone the route. | |
725 | */ | |
726 | ||
21efcfa0 | 727 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
728 | |
729 | if (rt) { | |
14deae41 DM |
730 | int attempts = !in_softirq(); |
731 | ||
38308473 | 732 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 733 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 734 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 735 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 736 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 737 | } |
1da177e4 | 738 | |
1da177e4 | 739 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
740 | |
741 | #ifdef CONFIG_IPV6_SUBTREES | |
742 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 743 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
744 | rt->rt6i_src.plen = 128; |
745 | } | |
746 | #endif | |
747 | ||
14deae41 | 748 | retry: |
f83c7790 | 749 | if (rt6_bind_neighbour(rt)) { |
d1918542 | 750 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
751 | int saved_rt_min_interval = |
752 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
753 | int saved_rt_elasticity = | |
754 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
755 | ||
756 | if (attempts-- > 0) { | |
757 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
758 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
759 | ||
86393e52 | 760 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
761 | |
762 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
763 | saved_rt_elasticity; | |
764 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
765 | saved_rt_min_interval; | |
766 | goto retry; | |
767 | } | |
768 | ||
769 | if (net_ratelimit()) | |
770 | printk(KERN_WARNING | |
7e1b33e5 | 771 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 772 | dst_free(&rt->dst); |
14deae41 DM |
773 | return NULL; |
774 | } | |
95a9a5ba | 775 | } |
1da177e4 | 776 | |
95a9a5ba YH |
777 | return rt; |
778 | } | |
1da177e4 | 779 | |
21efcfa0 ED |
780 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
781 | const struct in6_addr *daddr) | |
299d9939 | 782 | { |
21efcfa0 ED |
783 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
784 | ||
299d9939 | 785 | if (rt) { |
299d9939 | 786 | rt->rt6i_flags |= RTF_CACHE; |
27217455 | 787 | dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst))); |
299d9939 YH |
788 | } |
789 | return rt; | |
790 | } | |
791 | ||
8ed67789 | 792 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 793 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
794 | { |
795 | struct fib6_node *fn; | |
519fbd87 | 796 | struct rt6_info *rt, *nrt; |
c71099ac | 797 | int strict = 0; |
1da177e4 | 798 | int attempts = 3; |
519fbd87 | 799 | int err; |
53b7997f | 800 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 801 | |
77d16f45 | 802 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
803 | |
804 | relookup: | |
c71099ac | 805 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 806 | |
8238dd06 | 807 | restart_2: |
4c9483b2 | 808 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
809 | |
810 | restart: | |
4acad72d | 811 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 812 | |
4c9483b2 | 813 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 814 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 815 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 816 | goto out; |
1da177e4 | 817 | |
d8d1f30b | 818 | dst_hold(&rt->dst); |
c71099ac | 819 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 820 | |
27217455 | 821 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 822 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 823 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 824 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
825 | else |
826 | goto out2; | |
e40cf353 | 827 | |
d8d1f30b | 828 | dst_release(&rt->dst); |
8ed67789 | 829 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 830 | |
d8d1f30b | 831 | dst_hold(&rt->dst); |
519fbd87 | 832 | if (nrt) { |
40e22e8f | 833 | err = ip6_ins_rt(nrt); |
519fbd87 | 834 | if (!err) |
1da177e4 | 835 | goto out2; |
1da177e4 | 836 | } |
1da177e4 | 837 | |
519fbd87 YH |
838 | if (--attempts <= 0) |
839 | goto out2; | |
840 | ||
841 | /* | |
c71099ac | 842 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
843 | * released someone could insert this route. Relookup. |
844 | */ | |
d8d1f30b | 845 | dst_release(&rt->dst); |
519fbd87 YH |
846 | goto relookup; |
847 | ||
848 | out: | |
8238dd06 YH |
849 | if (reachable) { |
850 | reachable = 0; | |
851 | goto restart_2; | |
852 | } | |
d8d1f30b | 853 | dst_hold(&rt->dst); |
c71099ac | 854 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 855 | out2: |
d8d1f30b CG |
856 | rt->dst.lastuse = jiffies; |
857 | rt->dst.__use++; | |
c71099ac TG |
858 | |
859 | return rt; | |
1da177e4 LT |
860 | } |
861 | ||
8ed67789 | 862 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 863 | struct flowi6 *fl6, int flags) |
4acad72d | 864 | { |
4c9483b2 | 865 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
866 | } |
867 | ||
c71099ac TG |
868 | void ip6_route_input(struct sk_buff *skb) |
869 | { | |
b71d1d42 | 870 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 871 | struct net *net = dev_net(skb->dev); |
adaa70bb | 872 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
873 | struct flowi6 fl6 = { |
874 | .flowi6_iif = skb->dev->ifindex, | |
875 | .daddr = iph->daddr, | |
876 | .saddr = iph->saddr, | |
38308473 | 877 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
878 | .flowi6_mark = skb->mark, |
879 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 880 | }; |
adaa70bb | 881 | |
1d6e55f1 | 882 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 883 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 884 | |
4c9483b2 | 885 | skb_dst_set(skb, fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_input)); |
c71099ac TG |
886 | } |
887 | ||
8ed67789 | 888 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 889 | struct flowi6 *fl6, int flags) |
1da177e4 | 890 | { |
4c9483b2 | 891 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
892 | } |
893 | ||
9c7a4f9c | 894 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 895 | struct flowi6 *fl6) |
c71099ac TG |
896 | { |
897 | int flags = 0; | |
898 | ||
4c9483b2 | 899 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 900 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 901 | |
4c9483b2 | 902 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 903 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
904 | else if (sk) |
905 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 906 | |
4c9483b2 | 907 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
908 | } |
909 | ||
7159039a | 910 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 911 | |
2774c131 | 912 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 913 | { |
5c1e6aa3 | 914 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
915 | struct dst_entry *new = NULL; |
916 | ||
5c1e6aa3 | 917 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 918 | if (rt) { |
cf911662 DM |
919 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
920 | ||
d8d1f30b | 921 | new = &rt->dst; |
14e50e57 | 922 | |
14e50e57 | 923 | new->__use = 1; |
352e512c HX |
924 | new->input = dst_discard; |
925 | new->output = dst_discard; | |
14e50e57 | 926 | |
21efcfa0 ED |
927 | if (dst_metrics_read_only(&ort->dst)) |
928 | new->_metrics = ort->dst._metrics; | |
929 | else | |
930 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
931 | rt->rt6i_idev = ort->rt6i_idev; |
932 | if (rt->rt6i_idev) | |
933 | in6_dev_hold(rt->rt6i_idev); | |
d1918542 | 934 | rt->dst.expires = 0; |
14e50e57 | 935 | |
4e3fd7a0 | 936 | rt->rt6i_gateway = ort->rt6i_gateway; |
14e50e57 DM |
937 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
938 | rt->rt6i_metric = 0; | |
939 | ||
940 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
941 | #ifdef CONFIG_IPV6_SUBTREES | |
942 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
943 | #endif | |
944 | ||
945 | dst_free(new); | |
946 | } | |
947 | ||
69ead7af DM |
948 | dst_release(dst_orig); |
949 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 950 | } |
14e50e57 | 951 | |
1da177e4 LT |
952 | /* |
953 | * Destination cache support functions | |
954 | */ | |
955 | ||
956 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
957 | { | |
958 | struct rt6_info *rt; | |
959 | ||
960 | rt = (struct rt6_info *) dst; | |
961 | ||
6431cbc2 DM |
962 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
963 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
964 | if (!rt->rt6i_peer) | |
965 | rt6_bind_peer(rt, 0); | |
966 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
967 | } | |
1da177e4 | 968 | return dst; |
6431cbc2 | 969 | } |
1da177e4 LT |
970 | return NULL; |
971 | } | |
972 | ||
973 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
974 | { | |
975 | struct rt6_info *rt = (struct rt6_info *) dst; | |
976 | ||
977 | if (rt) { | |
54c1a859 YH |
978 | if (rt->rt6i_flags & RTF_CACHE) { |
979 | if (rt6_check_expired(rt)) { | |
980 | ip6_del_rt(rt); | |
981 | dst = NULL; | |
982 | } | |
983 | } else { | |
1da177e4 | 984 | dst_release(dst); |
54c1a859 YH |
985 | dst = NULL; |
986 | } | |
1da177e4 | 987 | } |
54c1a859 | 988 | return dst; |
1da177e4 LT |
989 | } |
990 | ||
991 | static void ip6_link_failure(struct sk_buff *skb) | |
992 | { | |
993 | struct rt6_info *rt; | |
994 | ||
3ffe533c | 995 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 996 | |
adf30907 | 997 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 998 | if (rt) { |
38308473 | 999 | if (rt->rt6i_flags & RTF_CACHE) { |
d8d1f30b | 1000 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
1001 | rt->rt6i_flags |= RTF_EXPIRES; |
1002 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1003 | rt->rt6i_node->fn_sernum = -1; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1008 | { | |
1009 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1010 | ||
1011 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
1012 | rt6->rt6i_flags |= RTF_MODIFIED; | |
1013 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1014 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1015 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1016 | features |= RTAX_FEATURE_ALLFRAG; |
1017 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1018 | } |
defb3519 | 1019 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
1020 | } |
1021 | } | |
1022 | ||
0dbaee3b | 1023 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1024 | { |
0dbaee3b DM |
1025 | struct net_device *dev = dst->dev; |
1026 | unsigned int mtu = dst_mtu(dst); | |
1027 | struct net *net = dev_net(dev); | |
1028 | ||
1da177e4 LT |
1029 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1030 | ||
5578689a DL |
1031 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1032 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1033 | |
1034 | /* | |
1ab1457c YH |
1035 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1036 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1037 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1038 | * rely only on pmtu discovery" |
1039 | */ | |
1040 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1041 | mtu = IPV6_MAXPLEN; | |
1042 | return mtu; | |
1043 | } | |
1044 | ||
ebb762f2 | 1045 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1046 | { |
d33e4553 | 1047 | struct inet6_dev *idev; |
618f9bc7 SK |
1048 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1049 | ||
1050 | if (mtu) | |
1051 | return mtu; | |
1052 | ||
1053 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1054 | |
1055 | rcu_read_lock(); | |
1056 | idev = __in6_dev_get(dst->dev); | |
1057 | if (idev) | |
1058 | mtu = idev->cnf.mtu6; | |
1059 | rcu_read_unlock(); | |
1060 | ||
1061 | return mtu; | |
1062 | } | |
1063 | ||
3b00944c YH |
1064 | static struct dst_entry *icmp6_dst_gc_list; |
1065 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1066 | |
3b00944c | 1067 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1068 | struct neighbour *neigh, |
87a11578 | 1069 | struct flowi6 *fl6) |
1da177e4 | 1070 | { |
87a11578 | 1071 | struct dst_entry *dst; |
1da177e4 LT |
1072 | struct rt6_info *rt; |
1073 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1074 | struct net *net = dev_net(dev); |
1da177e4 | 1075 | |
38308473 | 1076 | if (unlikely(!idev)) |
1da177e4 LT |
1077 | return NULL; |
1078 | ||
957c665f | 1079 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0); |
38308473 | 1080 | if (unlikely(!rt)) { |
1da177e4 | 1081 | in6_dev_put(idev); |
87a11578 | 1082 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1083 | goto out; |
1084 | } | |
1085 | ||
1da177e4 LT |
1086 | if (neigh) |
1087 | neigh_hold(neigh); | |
14deae41 | 1088 | else { |
f83c7790 | 1089 | neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr); |
b43faac6 DM |
1090 | if (IS_ERR(neigh)) { |
1091 | dst_free(&rt->dst); | |
1092 | return ERR_CAST(neigh); | |
1093 | } | |
14deae41 | 1094 | } |
1da177e4 | 1095 | |
8e2ec639 YZ |
1096 | rt->dst.flags |= DST_HOST; |
1097 | rt->dst.output = ip6_output; | |
69cce1d1 | 1098 | dst_set_neighbour(&rt->dst, neigh); |
d8d1f30b | 1099 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1100 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1101 | rt->rt6i_dst.plen = 128; |
1102 | rt->rt6i_idev = idev; | |
7011687f | 1103 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1104 | |
3b00944c | 1105 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1106 | rt->dst.next = icmp6_dst_gc_list; |
1107 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1108 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1109 | |
5578689a | 1110 | fib6_force_start_gc(net); |
1da177e4 | 1111 | |
87a11578 DM |
1112 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1113 | ||
1da177e4 | 1114 | out: |
87a11578 | 1115 | return dst; |
1da177e4 LT |
1116 | } |
1117 | ||
3d0f24a7 | 1118 | int icmp6_dst_gc(void) |
1da177e4 | 1119 | { |
e9476e95 | 1120 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1121 | int more = 0; |
1da177e4 | 1122 | |
3b00944c YH |
1123 | spin_lock_bh(&icmp6_dst_lock); |
1124 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1125 | |
1da177e4 LT |
1126 | while ((dst = *pprev) != NULL) { |
1127 | if (!atomic_read(&dst->__refcnt)) { | |
1128 | *pprev = dst->next; | |
1129 | dst_free(dst); | |
1da177e4 LT |
1130 | } else { |
1131 | pprev = &dst->next; | |
3d0f24a7 | 1132 | ++more; |
1da177e4 LT |
1133 | } |
1134 | } | |
1135 | ||
3b00944c | 1136 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1137 | |
3d0f24a7 | 1138 | return more; |
1da177e4 LT |
1139 | } |
1140 | ||
1e493d19 DM |
1141 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1142 | void *arg) | |
1143 | { | |
1144 | struct dst_entry *dst, **pprev; | |
1145 | ||
1146 | spin_lock_bh(&icmp6_dst_lock); | |
1147 | pprev = &icmp6_dst_gc_list; | |
1148 | while ((dst = *pprev) != NULL) { | |
1149 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1150 | if (func(rt, arg)) { | |
1151 | *pprev = dst->next; | |
1152 | dst_free(dst); | |
1153 | } else { | |
1154 | pprev = &dst->next; | |
1155 | } | |
1156 | } | |
1157 | spin_unlock_bh(&icmp6_dst_lock); | |
1158 | } | |
1159 | ||
569d3645 | 1160 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1161 | { |
1da177e4 | 1162 | unsigned long now = jiffies; |
86393e52 | 1163 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1164 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1165 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1166 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1167 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1168 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1169 | int entries; |
7019b78e | 1170 | |
fc66f95c | 1171 | entries = dst_entries_get_fast(ops); |
7019b78e | 1172 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1173 | entries <= rt_max_size) |
1da177e4 LT |
1174 | goto out; |
1175 | ||
6891a346 BT |
1176 | net->ipv6.ip6_rt_gc_expire++; |
1177 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1178 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1179 | entries = dst_entries_get_slow(ops); |
1180 | if (entries < ops->gc_thresh) | |
7019b78e | 1181 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1182 | out: |
7019b78e | 1183 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1184 | return entries > rt_max_size; |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1188 | but results in cleaner routing tables. | |
1189 | ||
1190 | Remove it only when all the things will work! | |
1191 | */ | |
1192 | ||
6b75d090 | 1193 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1194 | { |
5170ae82 | 1195 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1196 | if (hoplimit == 0) { |
6b75d090 | 1197 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1198 | struct inet6_dev *idev; |
1199 | ||
1200 | rcu_read_lock(); | |
1201 | idev = __in6_dev_get(dev); | |
1202 | if (idev) | |
6b75d090 | 1203 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1204 | else |
53b7997f | 1205 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1206 | rcu_read_unlock(); |
1da177e4 LT |
1207 | } |
1208 | return hoplimit; | |
1209 | } | |
abbf46ae | 1210 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1211 | |
1212 | /* | |
1213 | * | |
1214 | */ | |
1215 | ||
86872cb5 | 1216 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1217 | { |
1218 | int err; | |
5578689a | 1219 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1220 | struct rt6_info *rt = NULL; |
1221 | struct net_device *dev = NULL; | |
1222 | struct inet6_dev *idev = NULL; | |
c71099ac | 1223 | struct fib6_table *table; |
1da177e4 LT |
1224 | int addr_type; |
1225 | ||
86872cb5 | 1226 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1227 | return -EINVAL; |
1228 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1229 | if (cfg->fc_src_len) |
1da177e4 LT |
1230 | return -EINVAL; |
1231 | #endif | |
86872cb5 | 1232 | if (cfg->fc_ifindex) { |
1da177e4 | 1233 | err = -ENODEV; |
5578689a | 1234 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1235 | if (!dev) |
1236 | goto out; | |
1237 | idev = in6_dev_get(dev); | |
1238 | if (!idev) | |
1239 | goto out; | |
1240 | } | |
1241 | ||
86872cb5 TG |
1242 | if (cfg->fc_metric == 0) |
1243 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1244 | |
d71314b4 | 1245 | err = -ENOBUFS; |
38308473 DM |
1246 | if (cfg->fc_nlinfo.nlh && |
1247 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1248 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1249 | if (!table) { |
d71314b4 MV |
1250 | printk(KERN_WARNING "IPv6: NLM_F_CREATE should be specified when creating new route\n"); |
1251 | table = fib6_new_table(net, cfg->fc_table); | |
1252 | } | |
1253 | } else { | |
1254 | table = fib6_new_table(net, cfg->fc_table); | |
1255 | } | |
38308473 DM |
1256 | |
1257 | if (!table) | |
c71099ac | 1258 | goto out; |
c71099ac | 1259 | |
957c665f | 1260 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT); |
1da177e4 | 1261 | |
38308473 | 1262 | if (!rt) { |
1da177e4 LT |
1263 | err = -ENOMEM; |
1264 | goto out; | |
1265 | } | |
1266 | ||
d8d1f30b | 1267 | rt->dst.obsolete = -1; |
d1918542 | 1268 | rt->dst.expires = (cfg->fc_flags & RTF_EXPIRES) ? |
6f704992 YH |
1269 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : |
1270 | 0; | |
1da177e4 | 1271 | |
86872cb5 TG |
1272 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1273 | cfg->fc_protocol = RTPROT_BOOT; | |
1274 | rt->rt6i_protocol = cfg->fc_protocol; | |
1275 | ||
1276 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1277 | |
1278 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1279 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1280 | else if (cfg->fc_flags & RTF_LOCAL) |
1281 | rt->dst.input = ip6_input; | |
1da177e4 | 1282 | else |
d8d1f30b | 1283 | rt->dst.input = ip6_forward; |
1da177e4 | 1284 | |
d8d1f30b | 1285 | rt->dst.output = ip6_output; |
1da177e4 | 1286 | |
86872cb5 TG |
1287 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1288 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1289 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1290 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1291 | |
8e2ec639 YZ |
1292 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1293 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1294 | if (!metrics) { | |
1295 | err = -ENOMEM; | |
1296 | goto out; | |
1297 | } | |
1298 | dst_init_metrics(&rt->dst, metrics, 0); | |
1299 | } | |
1da177e4 | 1300 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1301 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1302 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1303 | #endif |
1304 | ||
86872cb5 | 1305 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1306 | |
1307 | /* We cannot add true routes via loopback here, | |
1308 | they would result in kernel looping; promote them to reject routes | |
1309 | */ | |
86872cb5 | 1310 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1311 | (dev && (dev->flags & IFF_LOOPBACK) && |
1312 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1313 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1314 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1315 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1316 | if (dev) { |
1317 | dev_put(dev); | |
1318 | in6_dev_put(idev); | |
1319 | } | |
5578689a | 1320 | dev = net->loopback_dev; |
1da177e4 LT |
1321 | dev_hold(dev); |
1322 | idev = in6_dev_get(dev); | |
1323 | if (!idev) { | |
1324 | err = -ENODEV; | |
1325 | goto out; | |
1326 | } | |
1327 | } | |
d8d1f30b CG |
1328 | rt->dst.output = ip6_pkt_discard_out; |
1329 | rt->dst.input = ip6_pkt_discard; | |
1330 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1331 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1332 | goto install_route; | |
1333 | } | |
1334 | ||
86872cb5 | 1335 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1336 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1337 | int gwa_type; |
1338 | ||
86872cb5 | 1339 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1340 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1341 | gwa_type = ipv6_addr_type(gw_addr); |
1342 | ||
1343 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1344 | struct rt6_info *grt; | |
1345 | ||
1346 | /* IPv6 strictly inhibits using not link-local | |
1347 | addresses as nexthop address. | |
1348 | Otherwise, router will not able to send redirects. | |
1349 | It is very good, but in some (rare!) circumstances | |
1350 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1351 | some exceptions. --ANK | |
1352 | */ | |
1353 | err = -EINVAL; | |
38308473 | 1354 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1355 | goto out; |
1356 | ||
5578689a | 1357 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1358 | |
1359 | err = -EHOSTUNREACH; | |
38308473 | 1360 | if (!grt) |
1da177e4 LT |
1361 | goto out; |
1362 | if (dev) { | |
d1918542 | 1363 | if (dev != grt->dst.dev) { |
d8d1f30b | 1364 | dst_release(&grt->dst); |
1da177e4 LT |
1365 | goto out; |
1366 | } | |
1367 | } else { | |
d1918542 | 1368 | dev = grt->dst.dev; |
1da177e4 LT |
1369 | idev = grt->rt6i_idev; |
1370 | dev_hold(dev); | |
1371 | in6_dev_hold(grt->rt6i_idev); | |
1372 | } | |
38308473 | 1373 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1374 | err = 0; |
d8d1f30b | 1375 | dst_release(&grt->dst); |
1da177e4 LT |
1376 | |
1377 | if (err) | |
1378 | goto out; | |
1379 | } | |
1380 | err = -EINVAL; | |
38308473 | 1381 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1382 | goto out; |
1383 | } | |
1384 | ||
1385 | err = -ENODEV; | |
38308473 | 1386 | if (!dev) |
1da177e4 LT |
1387 | goto out; |
1388 | ||
c3968a85 DW |
1389 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1390 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1391 | err = -EINVAL; | |
1392 | goto out; | |
1393 | } | |
4e3fd7a0 | 1394 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1395 | rt->rt6i_prefsrc.plen = 128; |
1396 | } else | |
1397 | rt->rt6i_prefsrc.plen = 0; | |
1398 | ||
86872cb5 | 1399 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
f83c7790 DM |
1400 | err = rt6_bind_neighbour(rt); |
1401 | if (err) | |
1da177e4 | 1402 | goto out; |
1da177e4 LT |
1403 | } |
1404 | ||
86872cb5 | 1405 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1406 | |
1407 | install_route: | |
86872cb5 TG |
1408 | if (cfg->fc_mx) { |
1409 | struct nlattr *nla; | |
1410 | int remaining; | |
1411 | ||
1412 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1413 | int type = nla_type(nla); |
86872cb5 TG |
1414 | |
1415 | if (type) { | |
1416 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1417 | err = -EINVAL; |
1418 | goto out; | |
1419 | } | |
86872cb5 | 1420 | |
defb3519 | 1421 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1422 | } |
1da177e4 LT |
1423 | } |
1424 | } | |
1425 | ||
d8d1f30b | 1426 | rt->dst.dev = dev; |
1da177e4 | 1427 | rt->rt6i_idev = idev; |
c71099ac | 1428 | rt->rt6i_table = table; |
63152fc0 | 1429 | |
c346dca1 | 1430 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1431 | |
86872cb5 | 1432 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1433 | |
1434 | out: | |
1435 | if (dev) | |
1436 | dev_put(dev); | |
1437 | if (idev) | |
1438 | in6_dev_put(idev); | |
1439 | if (rt) | |
d8d1f30b | 1440 | dst_free(&rt->dst); |
1da177e4 LT |
1441 | return err; |
1442 | } | |
1443 | ||
86872cb5 | 1444 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1445 | { |
1446 | int err; | |
c71099ac | 1447 | struct fib6_table *table; |
d1918542 | 1448 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1449 | |
8ed67789 | 1450 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1451 | return -ENOENT; |
1452 | ||
c71099ac TG |
1453 | table = rt->rt6i_table; |
1454 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1455 | |
86872cb5 | 1456 | err = fib6_del(rt, info); |
d8d1f30b | 1457 | dst_release(&rt->dst); |
1da177e4 | 1458 | |
c71099ac | 1459 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1460 | |
1461 | return err; | |
1462 | } | |
1463 | ||
e0a1ad73 TG |
1464 | int ip6_del_rt(struct rt6_info *rt) |
1465 | { | |
4d1169c1 | 1466 | struct nl_info info = { |
d1918542 | 1467 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1468 | }; |
528c4ceb | 1469 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1470 | } |
1471 | ||
86872cb5 | 1472 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1473 | { |
c71099ac | 1474 | struct fib6_table *table; |
1da177e4 LT |
1475 | struct fib6_node *fn; |
1476 | struct rt6_info *rt; | |
1477 | int err = -ESRCH; | |
1478 | ||
5578689a | 1479 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1480 | if (!table) |
c71099ac TG |
1481 | return err; |
1482 | ||
1483 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1484 | |
c71099ac | 1485 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1486 | &cfg->fc_dst, cfg->fc_dst_len, |
1487 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1488 | |
1da177e4 | 1489 | if (fn) { |
d8d1f30b | 1490 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1491 | if (cfg->fc_ifindex && |
d1918542 DM |
1492 | (!rt->dst.dev || |
1493 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1494 | continue; |
86872cb5 TG |
1495 | if (cfg->fc_flags & RTF_GATEWAY && |
1496 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1497 | continue; |
86872cb5 | 1498 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1499 | continue; |
d8d1f30b | 1500 | dst_hold(&rt->dst); |
c71099ac | 1501 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1502 | |
86872cb5 | 1503 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1504 | } |
1505 | } | |
c71099ac | 1506 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1507 | |
1508 | return err; | |
1509 | } | |
1510 | ||
1511 | /* | |
1512 | * Handle redirects | |
1513 | */ | |
a6279458 | 1514 | struct ip6rd_flowi { |
4c9483b2 | 1515 | struct flowi6 fl6; |
a6279458 YH |
1516 | struct in6_addr gateway; |
1517 | }; | |
1518 | ||
8ed67789 DL |
1519 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1520 | struct fib6_table *table, | |
4c9483b2 | 1521 | struct flowi6 *fl6, |
a6279458 | 1522 | int flags) |
1da177e4 | 1523 | { |
4c9483b2 | 1524 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
a6279458 | 1525 | struct rt6_info *rt; |
e843b9e1 | 1526 | struct fib6_node *fn; |
c71099ac | 1527 | |
1da177e4 | 1528 | /* |
e843b9e1 YH |
1529 | * Get the "current" route for this destination and |
1530 | * check if the redirect has come from approriate router. | |
1531 | * | |
1532 | * RFC 2461 specifies that redirects should only be | |
1533 | * accepted if they come from the nexthop to the target. | |
1534 | * Due to the way the routes are chosen, this notion | |
1535 | * is a bit fuzzy and one might need to check all possible | |
1536 | * routes. | |
1da177e4 | 1537 | */ |
1da177e4 | 1538 | |
c71099ac | 1539 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 1540 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
e843b9e1 | 1541 | restart: |
d8d1f30b | 1542 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1543 | /* |
1544 | * Current route is on-link; redirect is always invalid. | |
1545 | * | |
1546 | * Seems, previous statement is not true. It could | |
1547 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1548 | * But then router serving it might decide, that we should | |
1549 | * know truth 8)8) --ANK (980726). | |
1550 | */ | |
1551 | if (rt6_check_expired(rt)) | |
1552 | continue; | |
1553 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1554 | continue; | |
d1918542 | 1555 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) |
e843b9e1 | 1556 | continue; |
a6279458 | 1557 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1558 | continue; |
1559 | break; | |
1560 | } | |
a6279458 | 1561 | |
cb15d9c2 | 1562 | if (!rt) |
8ed67789 | 1563 | rt = net->ipv6.ip6_null_entry; |
4c9483b2 | 1564 | BACKTRACK(net, &fl6->saddr); |
cb15d9c2 | 1565 | out: |
d8d1f30b | 1566 | dst_hold(&rt->dst); |
a6279458 | 1567 | |
c71099ac | 1568 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1569 | |
a6279458 YH |
1570 | return rt; |
1571 | }; | |
1572 | ||
b71d1d42 ED |
1573 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
1574 | const struct in6_addr *src, | |
1575 | const struct in6_addr *gateway, | |
a6279458 YH |
1576 | struct net_device *dev) |
1577 | { | |
adaa70bb | 1578 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1579 | struct net *net = dev_net(dev); |
a6279458 | 1580 | struct ip6rd_flowi rdfl = { |
4c9483b2 DM |
1581 | .fl6 = { |
1582 | .flowi6_oif = dev->ifindex, | |
1583 | .daddr = *dest, | |
1584 | .saddr = *src, | |
a6279458 | 1585 | }, |
a6279458 | 1586 | }; |
adaa70bb | 1587 | |
4e3fd7a0 | 1588 | rdfl.gateway = *gateway; |
86c36ce4 | 1589 | |
adaa70bb TG |
1590 | if (rt6_need_strict(dest)) |
1591 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1592 | |
4c9483b2 | 1593 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
58f09b78 | 1594 | flags, __ip6_route_redirect); |
a6279458 YH |
1595 | } |
1596 | ||
b71d1d42 ED |
1597 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
1598 | const struct in6_addr *saddr, | |
a6279458 YH |
1599 | struct neighbour *neigh, u8 *lladdr, int on_link) |
1600 | { | |
1601 | struct rt6_info *rt, *nrt = NULL; | |
1602 | struct netevent_redirect netevent; | |
c346dca1 | 1603 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1604 | |
1605 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1606 | ||
8ed67789 | 1607 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1608 | if (net_ratelimit()) |
1609 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1610 | "for redirect target\n"); | |
a6279458 | 1611 | goto out; |
1da177e4 LT |
1612 | } |
1613 | ||
1da177e4 LT |
1614 | /* |
1615 | * We have finally decided to accept it. | |
1616 | */ | |
1617 | ||
1ab1457c | 1618 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1619 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1620 | NEIGH_UPDATE_F_OVERRIDE| | |
1621 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1622 | NEIGH_UPDATE_F_ISROUTER)) | |
1623 | ); | |
1624 | ||
1625 | /* | |
1626 | * Redirect received -> path was valid. | |
1627 | * Look, redirects are sent only in response to data packets, | |
1628 | * so that this nexthop apparently is reachable. --ANK | |
1629 | */ | |
d8d1f30b | 1630 | dst_confirm(&rt->dst); |
1da177e4 LT |
1631 | |
1632 | /* Duplicate redirect: silently ignore. */ | |
27217455 | 1633 | if (neigh == dst_get_neighbour_noref_raw(&rt->dst)) |
1da177e4 LT |
1634 | goto out; |
1635 | ||
21efcfa0 | 1636 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1637 | if (!nrt) |
1da177e4 LT |
1638 | goto out; |
1639 | ||
1640 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1641 | if (on_link) | |
1642 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1643 | ||
4e3fd7a0 | 1644 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
69cce1d1 | 1645 | dst_set_neighbour(&nrt->dst, neigh_clone(neigh)); |
1da177e4 | 1646 | |
40e22e8f | 1647 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1648 | goto out; |
1649 | ||
d8d1f30b CG |
1650 | netevent.old = &rt->dst; |
1651 | netevent.new = &nrt->dst; | |
8d71740c TT |
1652 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1653 | ||
38308473 | 1654 | if (rt->rt6i_flags & RTF_CACHE) { |
e0a1ad73 | 1655 | ip6_del_rt(rt); |
1da177e4 LT |
1656 | return; |
1657 | } | |
1658 | ||
1659 | out: | |
d8d1f30b | 1660 | dst_release(&rt->dst); |
1da177e4 LT |
1661 | } |
1662 | ||
1663 | /* | |
1664 | * Handle ICMP "packet too big" messages | |
1665 | * i.e. Path MTU discovery | |
1666 | */ | |
1667 | ||
b71d1d42 | 1668 | static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 | 1669 | struct net *net, u32 pmtu, int ifindex) |
1da177e4 LT |
1670 | { |
1671 | struct rt6_info *rt, *nrt; | |
1672 | int allfrag = 0; | |
d3052b55 | 1673 | again: |
ae878ae2 | 1674 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
38308473 | 1675 | if (!rt) |
1da177e4 LT |
1676 | return; |
1677 | ||
d3052b55 AV |
1678 | if (rt6_check_expired(rt)) { |
1679 | ip6_del_rt(rt); | |
1680 | goto again; | |
1681 | } | |
1682 | ||
d8d1f30b | 1683 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1684 | goto out; |
1685 | ||
1686 | if (pmtu < IPV6_MIN_MTU) { | |
1687 | /* | |
1ab1457c | 1688 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1689 | * MTU (1280) and a fragment header should always be included |
1690 | * after a node receiving Too Big message reporting PMTU is | |
1691 | * less than the IPv6 Minimum Link MTU. | |
1692 | */ | |
1693 | pmtu = IPV6_MIN_MTU; | |
1694 | allfrag = 1; | |
1695 | } | |
1696 | ||
1697 | /* New mtu received -> path was valid. | |
1698 | They are sent only in response to data packets, | |
1699 | so that this nexthop apparently is reachable. --ANK | |
1700 | */ | |
d8d1f30b | 1701 | dst_confirm(&rt->dst); |
1da177e4 LT |
1702 | |
1703 | /* Host route. If it is static, it would be better | |
1704 | not to override it, but add new one, so that | |
1705 | when cache entry will expire old pmtu | |
1706 | would return automatically. | |
1707 | */ | |
1708 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1709 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1710 | if (allfrag) { | |
1711 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1712 | features |= RTAX_FEATURE_ALLFRAG; | |
1713 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1714 | } | |
d8d1f30b | 1715 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1716 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1717 | goto out; | |
1718 | } | |
1719 | ||
1720 | /* Network route. | |
1721 | Two cases are possible: | |
1722 | 1. It is connected route. Action: COW | |
1723 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1724 | */ | |
27217455 | 1725 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1726 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1727 | else |
1728 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1729 | |
d5315b50 | 1730 | if (nrt) { |
defb3519 DM |
1731 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1732 | if (allfrag) { | |
1733 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1734 | features |= RTAX_FEATURE_ALLFRAG; | |
1735 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1736 | } | |
a1e78363 YH |
1737 | |
1738 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1739 | * happened within 5 mins, the recommended timer is 10 mins. | |
1740 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1741 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1742 | * and detecting PMTU increase will be automatically happened. | |
1743 | */ | |
d8d1f30b | 1744 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1745 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1746 | ||
40e22e8f | 1747 | ip6_ins_rt(nrt); |
1da177e4 | 1748 | } |
1da177e4 | 1749 | out: |
d8d1f30b | 1750 | dst_release(&rt->dst); |
1da177e4 LT |
1751 | } |
1752 | ||
b71d1d42 | 1753 | void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 MŻ |
1754 | struct net_device *dev, u32 pmtu) |
1755 | { | |
1756 | struct net *net = dev_net(dev); | |
1757 | ||
1758 | /* | |
1759 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1760 | * is sending along the path" that caused the Packet Too Big message. | |
1761 | * Since it's not possible in the general case to determine which | |
1762 | * interface was used to send the original packet, we update the MTU | |
1763 | * on the interface that will be used to send future packets. We also | |
1764 | * update the MTU on the interface that received the Packet Too Big in | |
1765 | * case the original packet was forced out that interface with | |
1766 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1767 | * correct behaviour, which would be to update the MTU on all | |
1768 | * interfaces. | |
1769 | */ | |
1770 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1771 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1772 | } | |
1773 | ||
1da177e4 LT |
1774 | /* |
1775 | * Misc support functions | |
1776 | */ | |
1777 | ||
21efcfa0 ED |
1778 | static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort, |
1779 | const struct in6_addr *dest) | |
1da177e4 | 1780 | { |
d1918542 | 1781 | struct net *net = dev_net(ort->dst.dev); |
5c1e6aa3 | 1782 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 1783 | ort->dst.dev, 0); |
1da177e4 LT |
1784 | |
1785 | if (rt) { | |
d8d1f30b CG |
1786 | rt->dst.input = ort->dst.input; |
1787 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1788 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1789 | |
4e3fd7a0 | 1790 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1791 | rt->rt6i_dst.plen = 128; |
defb3519 | 1792 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1793 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1794 | rt->rt6i_idev = ort->rt6i_idev; |
1795 | if (rt->rt6i_idev) | |
1796 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1797 | rt->dst.lastuse = jiffies; |
d1918542 | 1798 | rt->dst.expires = 0; |
1da177e4 | 1799 | |
4e3fd7a0 | 1800 | rt->rt6i_gateway = ort->rt6i_gateway; |
1da177e4 LT |
1801 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
1802 | rt->rt6i_metric = 0; | |
1803 | ||
1da177e4 LT |
1804 | #ifdef CONFIG_IPV6_SUBTREES |
1805 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1806 | #endif | |
0f6c6392 | 1807 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1808 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1809 | } |
1810 | return rt; | |
1811 | } | |
1812 | ||
70ceb4f5 | 1813 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1814 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1815 | const struct in6_addr *prefix, int prefixlen, |
1816 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1817 | { |
1818 | struct fib6_node *fn; | |
1819 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1820 | struct fib6_table *table; |
1821 | ||
efa2cea0 | 1822 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1823 | if (!table) |
c71099ac | 1824 | return NULL; |
70ceb4f5 | 1825 | |
c71099ac TG |
1826 | write_lock_bh(&table->tb6_lock); |
1827 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1828 | if (!fn) |
1829 | goto out; | |
1830 | ||
d8d1f30b | 1831 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1832 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1833 | continue; |
1834 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1835 | continue; | |
1836 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1837 | continue; | |
d8d1f30b | 1838 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1839 | break; |
1840 | } | |
1841 | out: | |
c71099ac | 1842 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1843 | return rt; |
1844 | } | |
1845 | ||
efa2cea0 | 1846 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1847 | const struct in6_addr *prefix, int prefixlen, |
1848 | const struct in6_addr *gwaddr, int ifindex, | |
70ceb4f5 YH |
1849 | unsigned pref) |
1850 | { | |
86872cb5 TG |
1851 | struct fib6_config cfg = { |
1852 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1853 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1854 | .fc_ifindex = ifindex, |
1855 | .fc_dst_len = prefixlen, | |
1856 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1857 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1858 | .fc_nlinfo.pid = 0, |
1859 | .fc_nlinfo.nlh = NULL, | |
1860 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1861 | }; |
1862 | ||
4e3fd7a0 AD |
1863 | cfg.fc_dst = *prefix; |
1864 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1865 | |
e317da96 YH |
1866 | /* We should treat it as a default route if prefix length is 0. */ |
1867 | if (!prefixlen) | |
86872cb5 | 1868 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1869 | |
86872cb5 | 1870 | ip6_route_add(&cfg); |
70ceb4f5 | 1871 | |
efa2cea0 | 1872 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1873 | } |
1874 | #endif | |
1875 | ||
b71d1d42 | 1876 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1877 | { |
1da177e4 | 1878 | struct rt6_info *rt; |
c71099ac | 1879 | struct fib6_table *table; |
1da177e4 | 1880 | |
c346dca1 | 1881 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1882 | if (!table) |
c71099ac | 1883 | return NULL; |
1da177e4 | 1884 | |
c71099ac | 1885 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1886 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1887 | if (dev == rt->dst.dev && |
045927ff | 1888 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1889 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1890 | break; | |
1891 | } | |
1892 | if (rt) | |
d8d1f30b | 1893 | dst_hold(&rt->dst); |
c71099ac | 1894 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1895 | return rt; |
1896 | } | |
1897 | ||
b71d1d42 | 1898 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1899 | struct net_device *dev, |
1900 | unsigned int pref) | |
1da177e4 | 1901 | { |
86872cb5 TG |
1902 | struct fib6_config cfg = { |
1903 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1904 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1905 | .fc_ifindex = dev->ifindex, |
1906 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1907 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1908 | .fc_nlinfo.pid = 0, |
1909 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1910 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1911 | }; |
1da177e4 | 1912 | |
4e3fd7a0 | 1913 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1914 | |
86872cb5 | 1915 | ip6_route_add(&cfg); |
1da177e4 | 1916 | |
1da177e4 LT |
1917 | return rt6_get_dflt_router(gwaddr, dev); |
1918 | } | |
1919 | ||
7b4da532 | 1920 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1921 | { |
1922 | struct rt6_info *rt; | |
c71099ac TG |
1923 | struct fib6_table *table; |
1924 | ||
1925 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1926 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1927 | if (!table) |
c71099ac | 1928 | return; |
1da177e4 LT |
1929 | |
1930 | restart: | |
c71099ac | 1931 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1932 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1933 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1934 | dst_hold(&rt->dst); |
c71099ac | 1935 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1936 | ip6_del_rt(rt); |
1da177e4 LT |
1937 | goto restart; |
1938 | } | |
1939 | } | |
c71099ac | 1940 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1941 | } |
1942 | ||
5578689a DL |
1943 | static void rtmsg_to_fib6_config(struct net *net, |
1944 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1945 | struct fib6_config *cfg) |
1946 | { | |
1947 | memset(cfg, 0, sizeof(*cfg)); | |
1948 | ||
1949 | cfg->fc_table = RT6_TABLE_MAIN; | |
1950 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1951 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1952 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1953 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1954 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1955 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1956 | ||
5578689a | 1957 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1958 | |
4e3fd7a0 AD |
1959 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1960 | cfg->fc_src = rtmsg->rtmsg_src; | |
1961 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1962 | } |
1963 | ||
5578689a | 1964 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1965 | { |
86872cb5 | 1966 | struct fib6_config cfg; |
1da177e4 LT |
1967 | struct in6_rtmsg rtmsg; |
1968 | int err; | |
1969 | ||
1970 | switch(cmd) { | |
1971 | case SIOCADDRT: /* Add a route */ | |
1972 | case SIOCDELRT: /* Delete a route */ | |
1973 | if (!capable(CAP_NET_ADMIN)) | |
1974 | return -EPERM; | |
1975 | err = copy_from_user(&rtmsg, arg, | |
1976 | sizeof(struct in6_rtmsg)); | |
1977 | if (err) | |
1978 | return -EFAULT; | |
86872cb5 | 1979 | |
5578689a | 1980 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1981 | |
1da177e4 LT |
1982 | rtnl_lock(); |
1983 | switch (cmd) { | |
1984 | case SIOCADDRT: | |
86872cb5 | 1985 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1986 | break; |
1987 | case SIOCDELRT: | |
86872cb5 | 1988 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1989 | break; |
1990 | default: | |
1991 | err = -EINVAL; | |
1992 | } | |
1993 | rtnl_unlock(); | |
1994 | ||
1995 | return err; | |
3ff50b79 | 1996 | } |
1da177e4 LT |
1997 | |
1998 | return -EINVAL; | |
1999 | } | |
2000 | ||
2001 | /* | |
2002 | * Drop the packet on the floor | |
2003 | */ | |
2004 | ||
d5fdd6ba | 2005 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2006 | { |
612f09e8 | 2007 | int type; |
adf30907 | 2008 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2009 | switch (ipstats_mib_noroutes) { |
2010 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2011 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2012 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2013 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2014 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2015 | break; |
2016 | } | |
2017 | /* FALLTHROUGH */ | |
2018 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2019 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2020 | ipstats_mib_noroutes); | |
612f09e8 YH |
2021 | break; |
2022 | } | |
3ffe533c | 2023 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2024 | kfree_skb(skb); |
2025 | return 0; | |
2026 | } | |
2027 | ||
9ce8ade0 TG |
2028 | static int ip6_pkt_discard(struct sk_buff *skb) |
2029 | { | |
612f09e8 | 2030 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2031 | } |
2032 | ||
20380731 | 2033 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2034 | { |
adf30907 | 2035 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2036 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2037 | } |
2038 | ||
6723ab54 DM |
2039 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2040 | ||
9ce8ade0 TG |
2041 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2042 | { | |
612f09e8 | 2043 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2044 | } |
2045 | ||
2046 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2047 | { | |
adf30907 | 2048 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2049 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2050 | } |
2051 | ||
6723ab54 DM |
2052 | #endif |
2053 | ||
1da177e4 LT |
2054 | /* |
2055 | * Allocate a dst for local (unicast / anycast) address. | |
2056 | */ | |
2057 | ||
2058 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2059 | const struct in6_addr *addr, | |
8f031519 | 2060 | bool anycast) |
1da177e4 | 2061 | { |
c346dca1 | 2062 | struct net *net = dev_net(idev->dev); |
5c1e6aa3 | 2063 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 2064 | net->loopback_dev, 0); |
f83c7790 | 2065 | int err; |
1da177e4 | 2066 | |
38308473 | 2067 | if (!rt) { |
40385653 BG |
2068 | if (net_ratelimit()) |
2069 | pr_warning("IPv6: Maximum number of routes reached," | |
2070 | " consider increasing route/max_size.\n"); | |
1da177e4 | 2071 | return ERR_PTR(-ENOMEM); |
40385653 | 2072 | } |
1da177e4 | 2073 | |
1da177e4 LT |
2074 | in6_dev_hold(idev); |
2075 | ||
11d53b49 | 2076 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2077 | rt->dst.input = ip6_input; |
2078 | rt->dst.output = ip6_output; | |
1da177e4 | 2079 | rt->rt6i_idev = idev; |
d8d1f30b | 2080 | rt->dst.obsolete = -1; |
1da177e4 LT |
2081 | |
2082 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2083 | if (anycast) |
2084 | rt->rt6i_flags |= RTF_ANYCAST; | |
2085 | else | |
1da177e4 | 2086 | rt->rt6i_flags |= RTF_LOCAL; |
f83c7790 DM |
2087 | err = rt6_bind_neighbour(rt); |
2088 | if (err) { | |
d8d1f30b | 2089 | dst_free(&rt->dst); |
f83c7790 | 2090 | return ERR_PTR(err); |
1da177e4 LT |
2091 | } |
2092 | ||
4e3fd7a0 | 2093 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2094 | rt->rt6i_dst.plen = 128; |
5578689a | 2095 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2096 | |
d8d1f30b | 2097 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2098 | |
2099 | return rt; | |
2100 | } | |
2101 | ||
c3968a85 DW |
2102 | int ip6_route_get_saddr(struct net *net, |
2103 | struct rt6_info *rt, | |
b71d1d42 | 2104 | const struct in6_addr *daddr, |
c3968a85 DW |
2105 | unsigned int prefs, |
2106 | struct in6_addr *saddr) | |
2107 | { | |
2108 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2109 | int err = 0; | |
2110 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2111 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2112 | else |
2113 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2114 | daddr, prefs, saddr); | |
2115 | return err; | |
2116 | } | |
2117 | ||
2118 | /* remove deleted ip from prefsrc entries */ | |
2119 | struct arg_dev_net_ip { | |
2120 | struct net_device *dev; | |
2121 | struct net *net; | |
2122 | struct in6_addr *addr; | |
2123 | }; | |
2124 | ||
2125 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2126 | { | |
2127 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2128 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2129 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2130 | ||
d1918542 | 2131 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2132 | rt != net->ipv6.ip6_null_entry && |
2133 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2134 | /* remove prefsrc entry */ | |
2135 | rt->rt6i_prefsrc.plen = 0; | |
2136 | } | |
2137 | return 0; | |
2138 | } | |
2139 | ||
2140 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2141 | { | |
2142 | struct net *net = dev_net(ifp->idev->dev); | |
2143 | struct arg_dev_net_ip adni = { | |
2144 | .dev = ifp->idev->dev, | |
2145 | .net = net, | |
2146 | .addr = &ifp->addr, | |
2147 | }; | |
2148 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2149 | } | |
2150 | ||
8ed67789 DL |
2151 | struct arg_dev_net { |
2152 | struct net_device *dev; | |
2153 | struct net *net; | |
2154 | }; | |
2155 | ||
1da177e4 LT |
2156 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2157 | { | |
bc3ef660 | 2158 | const struct arg_dev_net *adn = arg; |
2159 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2160 | |
d1918542 | 2161 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2162 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2163 | return -1; |
c159d30c | 2164 | |
1da177e4 LT |
2165 | return 0; |
2166 | } | |
2167 | ||
f3db4851 | 2168 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2169 | { |
8ed67789 DL |
2170 | struct arg_dev_net adn = { |
2171 | .dev = dev, | |
2172 | .net = net, | |
2173 | }; | |
2174 | ||
2175 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2176 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2177 | } |
2178 | ||
2179 | struct rt6_mtu_change_arg | |
2180 | { | |
2181 | struct net_device *dev; | |
2182 | unsigned mtu; | |
2183 | }; | |
2184 | ||
2185 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2186 | { | |
2187 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2188 | struct inet6_dev *idev; | |
2189 | ||
2190 | /* In IPv6 pmtu discovery is not optional, | |
2191 | so that RTAX_MTU lock cannot disable it. | |
2192 | We still use this lock to block changes | |
2193 | caused by addrconf/ndisc. | |
2194 | */ | |
2195 | ||
2196 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2197 | if (!idev) |
1da177e4 LT |
2198 | return 0; |
2199 | ||
2200 | /* For administrative MTU increase, there is no way to discover | |
2201 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2202 | Since RFC 1981 doesn't include administrative MTU increase | |
2203 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2204 | */ | |
2205 | /* | |
2206 | If new MTU is less than route PMTU, this new MTU will be the | |
2207 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2208 | decreases; if new MTU is greater than route PMTU, and the | |
2209 | old MTU is the lowest MTU in the path, update the route PMTU | |
2210 | to reflect the increase. In this case if the other nodes' MTU | |
2211 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2212 | PMTU discouvery. | |
2213 | */ | |
d1918542 | 2214 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2215 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2216 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2217 | (dst_mtu(&rt->dst) < arg->mtu && | |
2218 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2219 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2220 | } |
1da177e4 LT |
2221 | return 0; |
2222 | } | |
2223 | ||
2224 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2225 | { | |
c71099ac TG |
2226 | struct rt6_mtu_change_arg arg = { |
2227 | .dev = dev, | |
2228 | .mtu = mtu, | |
2229 | }; | |
1da177e4 | 2230 | |
c346dca1 | 2231 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2232 | } |
2233 | ||
ef7c79ed | 2234 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2235 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2236 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2237 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2238 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2239 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2240 | }; | |
2241 | ||
2242 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2243 | struct fib6_config *cfg) | |
1da177e4 | 2244 | { |
86872cb5 TG |
2245 | struct rtmsg *rtm; |
2246 | struct nlattr *tb[RTA_MAX+1]; | |
2247 | int err; | |
1da177e4 | 2248 | |
86872cb5 TG |
2249 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2250 | if (err < 0) | |
2251 | goto errout; | |
1da177e4 | 2252 | |
86872cb5 TG |
2253 | err = -EINVAL; |
2254 | rtm = nlmsg_data(nlh); | |
2255 | memset(cfg, 0, sizeof(*cfg)); | |
2256 | ||
2257 | cfg->fc_table = rtm->rtm_table; | |
2258 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2259 | cfg->fc_src_len = rtm->rtm_src_len; | |
2260 | cfg->fc_flags = RTF_UP; | |
2261 | cfg->fc_protocol = rtm->rtm_protocol; | |
2262 | ||
2263 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2264 | cfg->fc_flags |= RTF_REJECT; | |
2265 | ||
ab79ad14 MŻ |
2266 | if (rtm->rtm_type == RTN_LOCAL) |
2267 | cfg->fc_flags |= RTF_LOCAL; | |
2268 | ||
86872cb5 TG |
2269 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2270 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2271 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2272 | |
2273 | if (tb[RTA_GATEWAY]) { | |
2274 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2275 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2276 | } |
86872cb5 TG |
2277 | |
2278 | if (tb[RTA_DST]) { | |
2279 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2280 | ||
2281 | if (nla_len(tb[RTA_DST]) < plen) | |
2282 | goto errout; | |
2283 | ||
2284 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2285 | } |
86872cb5 TG |
2286 | |
2287 | if (tb[RTA_SRC]) { | |
2288 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2289 | ||
2290 | if (nla_len(tb[RTA_SRC]) < plen) | |
2291 | goto errout; | |
2292 | ||
2293 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2294 | } |
86872cb5 | 2295 | |
c3968a85 DW |
2296 | if (tb[RTA_PREFSRC]) |
2297 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2298 | ||
86872cb5 TG |
2299 | if (tb[RTA_OIF]) |
2300 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2301 | ||
2302 | if (tb[RTA_PRIORITY]) | |
2303 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2304 | ||
2305 | if (tb[RTA_METRICS]) { | |
2306 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2307 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2308 | } |
86872cb5 TG |
2309 | |
2310 | if (tb[RTA_TABLE]) | |
2311 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2312 | ||
2313 | err = 0; | |
2314 | errout: | |
2315 | return err; | |
1da177e4 LT |
2316 | } |
2317 | ||
c127ea2c | 2318 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2319 | { |
86872cb5 TG |
2320 | struct fib6_config cfg; |
2321 | int err; | |
1da177e4 | 2322 | |
86872cb5 TG |
2323 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2324 | if (err < 0) | |
2325 | return err; | |
2326 | ||
2327 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2328 | } |
2329 | ||
c127ea2c | 2330 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2331 | { |
86872cb5 TG |
2332 | struct fib6_config cfg; |
2333 | int err; | |
1da177e4 | 2334 | |
86872cb5 TG |
2335 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2336 | if (err < 0) | |
2337 | return err; | |
2338 | ||
2339 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2340 | } |
2341 | ||
339bf98f TG |
2342 | static inline size_t rt6_nlmsg_size(void) |
2343 | { | |
2344 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2345 | + nla_total_size(16) /* RTA_SRC */ | |
2346 | + nla_total_size(16) /* RTA_DST */ | |
2347 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2348 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2349 | + nla_total_size(4) /* RTA_TABLE */ | |
2350 | + nla_total_size(4) /* RTA_IIF */ | |
2351 | + nla_total_size(4) /* RTA_OIF */ | |
2352 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2353 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2354 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2355 | } | |
2356 | ||
191cd582 BH |
2357 | static int rt6_fill_node(struct net *net, |
2358 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2359 | struct in6_addr *dst, struct in6_addr *src, |
2360 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2361 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2362 | { |
2363 | struct rtmsg *rtm; | |
2d7202bf | 2364 | struct nlmsghdr *nlh; |
e3703b3d | 2365 | long expires; |
9e762a4a | 2366 | u32 table; |
f2c31e32 | 2367 | struct neighbour *n; |
1da177e4 LT |
2368 | |
2369 | if (prefix) { /* user wants prefix routes only */ | |
2370 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2371 | /* success since this is not a prefix route */ | |
2372 | return 1; | |
2373 | } | |
2374 | } | |
2375 | ||
2d7202bf | 2376 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
38308473 | 2377 | if (!nlh) |
26932566 | 2378 | return -EMSGSIZE; |
2d7202bf TG |
2379 | |
2380 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2381 | rtm->rtm_family = AF_INET6; |
2382 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2383 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2384 | rtm->rtm_tos = 0; | |
c71099ac | 2385 | if (rt->rt6i_table) |
9e762a4a | 2386 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2387 | else |
9e762a4a PM |
2388 | table = RT6_TABLE_UNSPEC; |
2389 | rtm->rtm_table = table; | |
2d7202bf | 2390 | NLA_PUT_U32(skb, RTA_TABLE, table); |
38308473 | 2391 | if (rt->rt6i_flags & RTF_REJECT) |
1da177e4 | 2392 | rtm->rtm_type = RTN_UNREACHABLE; |
38308473 | 2393 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2394 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2395 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2396 | rtm->rtm_type = RTN_LOCAL; |
2397 | else | |
2398 | rtm->rtm_type = RTN_UNICAST; | |
2399 | rtm->rtm_flags = 0; | |
2400 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2401 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2402 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 LT |
2403 | rtm->rtm_protocol = RTPROT_REDIRECT; |
2404 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2405 | rtm->rtm_protocol = RTPROT_KERNEL; | |
38308473 | 2406 | else if (rt->rt6i_flags & RTF_DEFAULT) |
1da177e4 LT |
2407 | rtm->rtm_protocol = RTPROT_RA; |
2408 | ||
38308473 | 2409 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2410 | rtm->rtm_flags |= RTM_F_CLONED; |
2411 | ||
2412 | if (dst) { | |
2d7202bf | 2413 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2414 | rtm->rtm_dst_len = 128; |
1da177e4 | 2415 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2416 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2417 | #ifdef CONFIG_IPV6_SUBTREES |
2418 | if (src) { | |
2d7202bf | 2419 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2420 | rtm->rtm_src_len = 128; |
1da177e4 | 2421 | } else if (rtm->rtm_src_len) |
2d7202bf | 2422 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2423 | #endif |
7bc570c8 YH |
2424 | if (iif) { |
2425 | #ifdef CONFIG_IPV6_MROUTE | |
2426 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2427 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2428 | if (err <= 0) { |
2429 | if (!nowait) { | |
2430 | if (err == 0) | |
2431 | return 0; | |
2432 | goto nla_put_failure; | |
2433 | } else { | |
2434 | if (err == -EMSGSIZE) | |
2435 | goto nla_put_failure; | |
2436 | } | |
2437 | } | |
2438 | } else | |
2439 | #endif | |
2440 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2441 | } else if (dst) { | |
1da177e4 | 2442 | struct in6_addr saddr_buf; |
c3968a85 | 2443 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0) |
2d7202bf | 2444 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2445 | } |
2d7202bf | 2446 | |
c3968a85 DW |
2447 | if (rt->rt6i_prefsrc.plen) { |
2448 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2449 | saddr_buf = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2450 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
2451 | } | |
2452 | ||
defb3519 | 2453 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2454 | goto nla_put_failure; |
2455 | ||
f2c31e32 | 2456 | rcu_read_lock(); |
27217455 | 2457 | n = dst_get_neighbour_noref(&rt->dst); |
f2c31e32 ED |
2458 | if (n) |
2459 | NLA_PUT(skb, RTA_GATEWAY, 16, &n->primary_key); | |
2460 | rcu_read_unlock(); | |
2d7202bf | 2461 | |
d8d1f30b | 2462 | if (rt->dst.dev) |
d1918542 | 2463 | NLA_PUT_U32(skb, RTA_OIF, rt->dst.dev->ifindex); |
2d7202bf TG |
2464 | |
2465 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2466 | |
36e3deae YH |
2467 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2468 | expires = 0; | |
d1918542 DM |
2469 | else if (rt->dst.expires - jiffies < INT_MAX) |
2470 | expires = rt->dst.expires - jiffies; | |
36e3deae YH |
2471 | else |
2472 | expires = INT_MAX; | |
69cdf8f9 | 2473 | |
d8d1f30b CG |
2474 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2475 | expires, rt->dst.error) < 0) | |
e3703b3d | 2476 | goto nla_put_failure; |
2d7202bf TG |
2477 | |
2478 | return nlmsg_end(skb, nlh); | |
2479 | ||
2480 | nla_put_failure: | |
26932566 PM |
2481 | nlmsg_cancel(skb, nlh); |
2482 | return -EMSGSIZE; | |
1da177e4 LT |
2483 | } |
2484 | ||
1b43af54 | 2485 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2486 | { |
2487 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2488 | int prefix; | |
2489 | ||
2d7202bf TG |
2490 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2491 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2492 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2493 | } else | |
2494 | prefix = 0; | |
2495 | ||
191cd582 BH |
2496 | return rt6_fill_node(arg->net, |
2497 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2498 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2499 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2500 | } |
2501 | ||
c127ea2c | 2502 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2503 | { |
3b1e0a65 | 2504 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2505 | struct nlattr *tb[RTA_MAX+1]; |
2506 | struct rt6_info *rt; | |
1da177e4 | 2507 | struct sk_buff *skb; |
ab364a6f | 2508 | struct rtmsg *rtm; |
4c9483b2 | 2509 | struct flowi6 fl6; |
ab364a6f | 2510 | int err, iif = 0; |
1da177e4 | 2511 | |
ab364a6f TG |
2512 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2513 | if (err < 0) | |
2514 | goto errout; | |
1da177e4 | 2515 | |
ab364a6f | 2516 | err = -EINVAL; |
4c9483b2 | 2517 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2518 | |
ab364a6f TG |
2519 | if (tb[RTA_SRC]) { |
2520 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2521 | goto errout; | |
2522 | ||
4e3fd7a0 | 2523 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2524 | } |
2525 | ||
2526 | if (tb[RTA_DST]) { | |
2527 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2528 | goto errout; | |
2529 | ||
4e3fd7a0 | 2530 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2531 | } |
2532 | ||
2533 | if (tb[RTA_IIF]) | |
2534 | iif = nla_get_u32(tb[RTA_IIF]); | |
2535 | ||
2536 | if (tb[RTA_OIF]) | |
4c9483b2 | 2537 | fl6.flowi6_oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2538 | |
2539 | if (iif) { | |
2540 | struct net_device *dev; | |
5578689a | 2541 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2542 | if (!dev) { |
2543 | err = -ENODEV; | |
ab364a6f | 2544 | goto errout; |
1da177e4 LT |
2545 | } |
2546 | } | |
2547 | ||
ab364a6f | 2548 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2549 | if (!skb) { |
ab364a6f TG |
2550 | err = -ENOBUFS; |
2551 | goto errout; | |
2552 | } | |
1da177e4 | 2553 | |
ab364a6f TG |
2554 | /* Reserve room for dummy headers, this skb can pass |
2555 | through good chunk of routing engine. | |
2556 | */ | |
459a98ed | 2557 | skb_reset_mac_header(skb); |
ab364a6f | 2558 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2559 | |
4c9483b2 | 2560 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl6); |
d8d1f30b | 2561 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2562 | |
4c9483b2 | 2563 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2564 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2565 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2566 | if (err < 0) { |
ab364a6f TG |
2567 | kfree_skb(skb); |
2568 | goto errout; | |
1da177e4 LT |
2569 | } |
2570 | ||
5578689a | 2571 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2572 | errout: |
1da177e4 | 2573 | return err; |
1da177e4 LT |
2574 | } |
2575 | ||
86872cb5 | 2576 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2577 | { |
2578 | struct sk_buff *skb; | |
5578689a | 2579 | struct net *net = info->nl_net; |
528c4ceb DL |
2580 | u32 seq; |
2581 | int err; | |
2582 | ||
2583 | err = -ENOBUFS; | |
38308473 | 2584 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2585 | |
339bf98f | 2586 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2587 | if (!skb) |
21713ebc TG |
2588 | goto errout; |
2589 | ||
191cd582 | 2590 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2591 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2592 | if (err < 0) { |
2593 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2594 | WARN_ON(err == -EMSGSIZE); | |
2595 | kfree_skb(skb); | |
2596 | goto errout; | |
2597 | } | |
1ce85fe4 PNA |
2598 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2599 | info->nlh, gfp_any()); | |
2600 | return; | |
21713ebc TG |
2601 | errout: |
2602 | if (err < 0) | |
5578689a | 2603 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2604 | } |
2605 | ||
8ed67789 DL |
2606 | static int ip6_route_dev_notify(struct notifier_block *this, |
2607 | unsigned long event, void *data) | |
2608 | { | |
2609 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2610 | struct net *net = dev_net(dev); |
8ed67789 DL |
2611 | |
2612 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2613 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2614 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2615 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2616 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2617 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2618 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2619 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2620 | #endif | |
2621 | } | |
2622 | ||
2623 | return NOTIFY_OK; | |
2624 | } | |
2625 | ||
1da177e4 LT |
2626 | /* |
2627 | * /proc | |
2628 | */ | |
2629 | ||
2630 | #ifdef CONFIG_PROC_FS | |
2631 | ||
1da177e4 LT |
2632 | struct rt6_proc_arg |
2633 | { | |
2634 | char *buffer; | |
2635 | int offset; | |
2636 | int length; | |
2637 | int skip; | |
2638 | int len; | |
2639 | }; | |
2640 | ||
2641 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2642 | { | |
33120b30 | 2643 | struct seq_file *m = p_arg; |
69cce1d1 | 2644 | struct neighbour *n; |
1da177e4 | 2645 | |
4b7a4274 | 2646 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2647 | |
2648 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2649 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2650 | #else |
33120b30 | 2651 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2652 | #endif |
f2c31e32 | 2653 | rcu_read_lock(); |
27217455 | 2654 | n = dst_get_neighbour_noref(&rt->dst); |
69cce1d1 DM |
2655 | if (n) { |
2656 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2657 | } else { |
33120b30 | 2658 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2659 | } |
f2c31e32 | 2660 | rcu_read_unlock(); |
33120b30 | 2661 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2662 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2663 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2664 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2665 | return 0; |
2666 | } | |
2667 | ||
33120b30 | 2668 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2669 | { |
f3db4851 DL |
2670 | struct net *net = (struct net *)m->private; |
2671 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2672 | return 0; |
2673 | } | |
1da177e4 | 2674 | |
33120b30 AD |
2675 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2676 | { | |
de05c557 | 2677 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2678 | } |
2679 | ||
33120b30 AD |
2680 | static const struct file_operations ipv6_route_proc_fops = { |
2681 | .owner = THIS_MODULE, | |
2682 | .open = ipv6_route_open, | |
2683 | .read = seq_read, | |
2684 | .llseek = seq_lseek, | |
b6fcbdb4 | 2685 | .release = single_release_net, |
33120b30 AD |
2686 | }; |
2687 | ||
1da177e4 LT |
2688 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2689 | { | |
69ddb805 | 2690 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2691 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2692 | net->ipv6.rt6_stats->fib_nodes, |
2693 | net->ipv6.rt6_stats->fib_route_nodes, | |
2694 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2695 | net->ipv6.rt6_stats->fib_rt_entries, | |
2696 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2697 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2698 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2699 | |
2700 | return 0; | |
2701 | } | |
2702 | ||
2703 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2704 | { | |
de05c557 | 2705 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2706 | } |
2707 | ||
9a32144e | 2708 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2709 | .owner = THIS_MODULE, |
2710 | .open = rt6_stats_seq_open, | |
2711 | .read = seq_read, | |
2712 | .llseek = seq_lseek, | |
b6fcbdb4 | 2713 | .release = single_release_net, |
1da177e4 LT |
2714 | }; |
2715 | #endif /* CONFIG_PROC_FS */ | |
2716 | ||
2717 | #ifdef CONFIG_SYSCTL | |
2718 | ||
1da177e4 | 2719 | static |
8d65af78 | 2720 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2721 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2722 | { | |
c486da34 LAG |
2723 | struct net *net; |
2724 | int delay; | |
2725 | if (!write) | |
1da177e4 | 2726 | return -EINVAL; |
c486da34 LAG |
2727 | |
2728 | net = (struct net *)ctl->extra1; | |
2729 | delay = net->ipv6.sysctl.flush_delay; | |
2730 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2731 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2732 | return 0; | |
1da177e4 LT |
2733 | } |
2734 | ||
760f2d01 | 2735 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2736 | { |
1da177e4 | 2737 | .procname = "flush", |
4990509f | 2738 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2739 | .maxlen = sizeof(int), |
89c8b3a1 | 2740 | .mode = 0200, |
6d9f239a | 2741 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2742 | }, |
2743 | { | |
1da177e4 | 2744 | .procname = "gc_thresh", |
9a7ec3a9 | 2745 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2746 | .maxlen = sizeof(int), |
2747 | .mode = 0644, | |
6d9f239a | 2748 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2749 | }, |
2750 | { | |
1da177e4 | 2751 | .procname = "max_size", |
4990509f | 2752 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2753 | .maxlen = sizeof(int), |
2754 | .mode = 0644, | |
6d9f239a | 2755 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2756 | }, |
2757 | { | |
1da177e4 | 2758 | .procname = "gc_min_interval", |
4990509f | 2759 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2760 | .maxlen = sizeof(int), |
2761 | .mode = 0644, | |
6d9f239a | 2762 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2763 | }, |
2764 | { | |
1da177e4 | 2765 | .procname = "gc_timeout", |
4990509f | 2766 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2767 | .maxlen = sizeof(int), |
2768 | .mode = 0644, | |
6d9f239a | 2769 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2770 | }, |
2771 | { | |
1da177e4 | 2772 | .procname = "gc_interval", |
4990509f | 2773 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2774 | .maxlen = sizeof(int), |
2775 | .mode = 0644, | |
6d9f239a | 2776 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2777 | }, |
2778 | { | |
1da177e4 | 2779 | .procname = "gc_elasticity", |
4990509f | 2780 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2781 | .maxlen = sizeof(int), |
2782 | .mode = 0644, | |
f3d3f616 | 2783 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2784 | }, |
2785 | { | |
1da177e4 | 2786 | .procname = "mtu_expires", |
4990509f | 2787 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2788 | .maxlen = sizeof(int), |
2789 | .mode = 0644, | |
6d9f239a | 2790 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2791 | }, |
2792 | { | |
1da177e4 | 2793 | .procname = "min_adv_mss", |
4990509f | 2794 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2795 | .maxlen = sizeof(int), |
2796 | .mode = 0644, | |
f3d3f616 | 2797 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2798 | }, |
2799 | { | |
1da177e4 | 2800 | .procname = "gc_min_interval_ms", |
4990509f | 2801 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2802 | .maxlen = sizeof(int), |
2803 | .mode = 0644, | |
6d9f239a | 2804 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2805 | }, |
f8572d8f | 2806 | { } |
1da177e4 LT |
2807 | }; |
2808 | ||
2c8c1e72 | 2809 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2810 | { |
2811 | struct ctl_table *table; | |
2812 | ||
2813 | table = kmemdup(ipv6_route_table_template, | |
2814 | sizeof(ipv6_route_table_template), | |
2815 | GFP_KERNEL); | |
5ee09105 YH |
2816 | |
2817 | if (table) { | |
2818 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2819 | table[0].extra1 = net; |
86393e52 | 2820 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2821 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2822 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2823 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2824 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2825 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2826 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2827 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2828 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2829 | } |
2830 | ||
760f2d01 DL |
2831 | return table; |
2832 | } | |
1da177e4 LT |
2833 | #endif |
2834 | ||
2c8c1e72 | 2835 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2836 | { |
633d424b | 2837 | int ret = -ENOMEM; |
8ed67789 | 2838 | |
86393e52 AD |
2839 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2840 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2841 | |
fc66f95c ED |
2842 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2843 | goto out_ip6_dst_ops; | |
2844 | ||
8ed67789 DL |
2845 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2846 | sizeof(*net->ipv6.ip6_null_entry), | |
2847 | GFP_KERNEL); | |
2848 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2849 | goto out_ip6_dst_entries; |
d8d1f30b | 2850 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2851 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2852 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2853 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2854 | ip6_template_metrics, true); | |
8ed67789 DL |
2855 | |
2856 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2857 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2858 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2859 | GFP_KERNEL); | |
68fffc67 PZ |
2860 | if (!net->ipv6.ip6_prohibit_entry) |
2861 | goto out_ip6_null_entry; | |
d8d1f30b | 2862 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2863 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2864 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2865 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2866 | ip6_template_metrics, true); | |
8ed67789 DL |
2867 | |
2868 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2869 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2870 | GFP_KERNEL); | |
68fffc67 PZ |
2871 | if (!net->ipv6.ip6_blk_hole_entry) |
2872 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2873 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2874 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2875 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2876 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2877 | ip6_template_metrics, true); | |
8ed67789 DL |
2878 | #endif |
2879 | ||
b339a47c PZ |
2880 | net->ipv6.sysctl.flush_delay = 0; |
2881 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2882 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2883 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2884 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2885 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2886 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2887 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2888 | ||
cdb18761 DL |
2889 | #ifdef CONFIG_PROC_FS |
2890 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2891 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2892 | #endif | |
6891a346 BT |
2893 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2894 | ||
8ed67789 DL |
2895 | ret = 0; |
2896 | out: | |
2897 | return ret; | |
f2fc6a54 | 2898 | |
68fffc67 PZ |
2899 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2900 | out_ip6_prohibit_entry: | |
2901 | kfree(net->ipv6.ip6_prohibit_entry); | |
2902 | out_ip6_null_entry: | |
2903 | kfree(net->ipv6.ip6_null_entry); | |
2904 | #endif | |
fc66f95c ED |
2905 | out_ip6_dst_entries: |
2906 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2907 | out_ip6_dst_ops: |
f2fc6a54 | 2908 | goto out; |
cdb18761 DL |
2909 | } |
2910 | ||
2c8c1e72 | 2911 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2912 | { |
2913 | #ifdef CONFIG_PROC_FS | |
2914 | proc_net_remove(net, "ipv6_route"); | |
2915 | proc_net_remove(net, "rt6_stats"); | |
2916 | #endif | |
8ed67789 DL |
2917 | kfree(net->ipv6.ip6_null_entry); |
2918 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2919 | kfree(net->ipv6.ip6_prohibit_entry); | |
2920 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2921 | #endif | |
41bb78b4 | 2922 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2923 | } |
2924 | ||
2925 | static struct pernet_operations ip6_route_net_ops = { | |
2926 | .init = ip6_route_net_init, | |
2927 | .exit = ip6_route_net_exit, | |
2928 | }; | |
2929 | ||
8ed67789 DL |
2930 | static struct notifier_block ip6_route_dev_notifier = { |
2931 | .notifier_call = ip6_route_dev_notify, | |
2932 | .priority = 0, | |
2933 | }; | |
2934 | ||
433d49c3 | 2935 | int __init ip6_route_init(void) |
1da177e4 | 2936 | { |
433d49c3 DL |
2937 | int ret; |
2938 | ||
9a7ec3a9 DL |
2939 | ret = -ENOMEM; |
2940 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2941 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2942 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2943 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2944 | goto out; |
14e50e57 | 2945 | |
fc66f95c | 2946 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2947 | if (ret) |
bdb3289f | 2948 | goto out_kmem_cache; |
bdb3289f | 2949 | |
fc66f95c ED |
2950 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2951 | if (ret) | |
2952 | goto out_dst_entries; | |
2953 | ||
5dc121e9 AE |
2954 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2955 | ||
8ed67789 DL |
2956 | /* Registering of the loopback is done before this portion of code, |
2957 | * the loopback reference in rt6_info will not be taken, do it | |
2958 | * manually for init_net */ | |
d8d1f30b | 2959 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2960 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2961 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2962 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2963 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2964 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2965 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2966 | #endif | |
433d49c3 DL |
2967 | ret = fib6_init(); |
2968 | if (ret) | |
8ed67789 | 2969 | goto out_register_subsys; |
433d49c3 | 2970 | |
433d49c3 DL |
2971 | ret = xfrm6_init(); |
2972 | if (ret) | |
cdb18761 | 2973 | goto out_fib6_init; |
c35b7e72 | 2974 | |
433d49c3 DL |
2975 | ret = fib6_rules_init(); |
2976 | if (ret) | |
2977 | goto xfrm6_init; | |
7e5449c2 | 2978 | |
433d49c3 | 2979 | ret = -ENOBUFS; |
c7ac8679 GR |
2980 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
2981 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
2982 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
433d49c3 | 2983 | goto fib6_rules_init; |
c127ea2c | 2984 | |
8ed67789 | 2985 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2986 | if (ret) |
2987 | goto fib6_rules_init; | |
8ed67789 | 2988 | |
433d49c3 DL |
2989 | out: |
2990 | return ret; | |
2991 | ||
2992 | fib6_rules_init: | |
433d49c3 DL |
2993 | fib6_rules_cleanup(); |
2994 | xfrm6_init: | |
433d49c3 | 2995 | xfrm6_fini(); |
433d49c3 | 2996 | out_fib6_init: |
433d49c3 | 2997 | fib6_gc_cleanup(); |
8ed67789 DL |
2998 | out_register_subsys: |
2999 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
3000 | out_dst_entries: |
3001 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3002 | out_kmem_cache: |
f2fc6a54 | 3003 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3004 | goto out; |
1da177e4 LT |
3005 | } |
3006 | ||
3007 | void ip6_route_cleanup(void) | |
3008 | { | |
8ed67789 | 3009 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 3010 | fib6_rules_cleanup(); |
1da177e4 | 3011 | xfrm6_fini(); |
1da177e4 | 3012 | fib6_gc_cleanup(); |
8ed67789 | 3013 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3014 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3015 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3016 | } |