Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 | 30 | #include <linux/errno.h> |
bc3b2d7f | 31 | #include <linux/export.h> |
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/times.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/in6.h> | |
7bc570c8 | 40 | #include <linux/mroute6.h> |
1da177e4 | 41 | #include <linux/init.h> |
1da177e4 | 42 | #include <linux/if_arp.h> |
1da177e4 LT |
43 | #include <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
5b7c931d | 45 | #include <linux/nsproxy.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
57 | #include <net/xfrm.h> | |
8d71740c | 58 | #include <net/netevent.h> |
21713ebc | 59 | #include <net/netlink.h> |
1da177e4 LT |
60 | |
61 | #include <asm/uaccess.h> | |
62 | ||
63 | #ifdef CONFIG_SYSCTL | |
64 | #include <linux/sysctl.h> | |
65 | #endif | |
66 | ||
1716a961 | 67 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 68 | const struct in6_addr *dest); |
1da177e4 | 69 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 70 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 71 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
72 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
73 | static void ip6_dst_destroy(struct dst_entry *); | |
74 | static void ip6_dst_ifdown(struct dst_entry *, | |
75 | struct net_device *dev, int how); | |
569d3645 | 76 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
77 | |
78 | static int ip6_pkt_discard(struct sk_buff *skb); | |
79 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
80 | static void ip6_link_failure(struct sk_buff *skb); | |
81 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
82 | ||
70ceb4f5 | 83 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 84 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
85 | const struct in6_addr *prefix, int prefixlen, |
86 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 87 | unsigned int pref); |
efa2cea0 | 88 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
89 | const struct in6_addr *prefix, int prefixlen, |
90 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
91 | #endif |
92 | ||
06582540 DM |
93 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
94 | { | |
95 | struct rt6_info *rt = (struct rt6_info *) dst; | |
96 | struct inet_peer *peer; | |
97 | u32 *p = NULL; | |
98 | ||
8e2ec639 YZ |
99 | if (!(rt->dst.flags & DST_HOST)) |
100 | return NULL; | |
101 | ||
fbfe95a4 | 102 | peer = rt6_get_peer_create(rt); |
06582540 DM |
103 | if (peer) { |
104 | u32 *old_p = __DST_METRICS_PTR(old); | |
105 | unsigned long prev, new; | |
106 | ||
107 | p = peer->metrics; | |
108 | if (inet_metrics_new(peer)) | |
109 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
110 | ||
111 | new = (unsigned long) p; | |
112 | prev = cmpxchg(&dst->_metrics, old, new); | |
113 | ||
114 | if (prev != old) { | |
115 | p = __DST_METRICS_PTR(prev); | |
116 | if (prev & DST_METRICS_READ_ONLY) | |
117 | p = NULL; | |
118 | } | |
119 | } | |
120 | return p; | |
121 | } | |
122 | ||
39232973 DM |
123 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr) |
124 | { | |
125 | struct in6_addr *p = &rt->rt6i_gateway; | |
126 | ||
a7563f34 | 127 | if (!ipv6_addr_any(p)) |
39232973 DM |
128 | return (const void *) p; |
129 | return daddr; | |
130 | } | |
131 | ||
d3aaeb38 DM |
132 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
133 | { | |
39232973 DM |
134 | struct rt6_info *rt = (struct rt6_info *) dst; |
135 | struct neighbour *n; | |
136 | ||
137 | daddr = choose_neigh_daddr(rt, daddr); | |
138 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); | |
f83c7790 DM |
139 | if (n) |
140 | return n; | |
141 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
142 | } | |
143 | ||
8ade06c6 | 144 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
f83c7790 | 145 | { |
8ade06c6 DM |
146 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
147 | if (!n) { | |
148 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); | |
149 | if (IS_ERR(n)) | |
150 | return PTR_ERR(n); | |
151 | } | |
f83c7790 DM |
152 | dst_set_neighbour(&rt->dst, n); |
153 | ||
154 | return 0; | |
d3aaeb38 DM |
155 | } |
156 | ||
9a7ec3a9 | 157 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 158 | .family = AF_INET6, |
09640e63 | 159 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
160 | .gc = ip6_dst_gc, |
161 | .gc_thresh = 1024, | |
162 | .check = ip6_dst_check, | |
0dbaee3b | 163 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 164 | .mtu = ip6_mtu, |
06582540 | 165 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
166 | .destroy = ip6_dst_destroy, |
167 | .ifdown = ip6_dst_ifdown, | |
168 | .negative_advice = ip6_negative_advice, | |
169 | .link_failure = ip6_link_failure, | |
170 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 171 | .local_out = __ip6_local_out, |
d3aaeb38 | 172 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
173 | }; |
174 | ||
ebb762f2 | 175 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 176 | { |
618f9bc7 SK |
177 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
178 | ||
179 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
180 | } |
181 | ||
14e50e57 DM |
182 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
183 | { | |
184 | } | |
185 | ||
0972ddb2 HB |
186 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
187 | unsigned long old) | |
188 | { | |
189 | return NULL; | |
190 | } | |
191 | ||
14e50e57 DM |
192 | static struct dst_ops ip6_dst_blackhole_ops = { |
193 | .family = AF_INET6, | |
09640e63 | 194 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
195 | .destroy = ip6_dst_destroy, |
196 | .check = ip6_dst_check, | |
ebb762f2 | 197 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 198 | .default_advmss = ip6_default_advmss, |
14e50e57 | 199 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 200 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 201 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
202 | }; |
203 | ||
62fa8a84 DM |
204 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
205 | [RTAX_HOPLIMIT - 1] = 255, | |
206 | }; | |
207 | ||
bdb3289f | 208 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
209 | .dst = { |
210 | .__refcnt = ATOMIC_INIT(1), | |
211 | .__use = 1, | |
212 | .obsolete = -1, | |
213 | .error = -ENETUNREACH, | |
d8d1f30b CG |
214 | .input = ip6_pkt_discard, |
215 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
216 | }, |
217 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 218 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
219 | .rt6i_metric = ~(u32) 0, |
220 | .rt6i_ref = ATOMIC_INIT(1), | |
221 | }; | |
222 | ||
101367c2 TG |
223 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
224 | ||
6723ab54 DM |
225 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
226 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 227 | |
280a34c8 | 228 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
229 | .dst = { |
230 | .__refcnt = ATOMIC_INIT(1), | |
231 | .__use = 1, | |
232 | .obsolete = -1, | |
233 | .error = -EACCES, | |
d8d1f30b CG |
234 | .input = ip6_pkt_prohibit, |
235 | .output = ip6_pkt_prohibit_out, | |
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 | ||
bdb3289f | 243 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
244 | .dst = { |
245 | .__refcnt = ATOMIC_INIT(1), | |
246 | .__use = 1, | |
247 | .obsolete = -1, | |
248 | .error = -EINVAL, | |
d8d1f30b CG |
249 | .input = dst_discard, |
250 | .output = dst_discard, | |
101367c2 TG |
251 | }, |
252 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 253 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
254 | .rt6i_metric = ~(u32) 0, |
255 | .rt6i_ref = ATOMIC_INIT(1), | |
256 | }; | |
257 | ||
258 | #endif | |
259 | ||
1da177e4 | 260 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 261 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 262 | struct net_device *dev, |
8b96d22d DM |
263 | int flags, |
264 | struct fib6_table *table) | |
1da177e4 | 265 | { |
97bab73f DM |
266 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
267 | 0, 0, flags); | |
cf911662 | 268 | |
97bab73f | 269 | if (rt) { |
fbe58186 | 270 | memset(&rt->rt6i_table, 0, |
38308473 | 271 | sizeof(*rt) - sizeof(struct dst_entry)); |
8b96d22d | 272 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
97bab73f | 273 | } |
cf911662 | 274 | return rt; |
1da177e4 LT |
275 | } |
276 | ||
277 | static void ip6_dst_destroy(struct dst_entry *dst) | |
278 | { | |
279 | struct rt6_info *rt = (struct rt6_info *)dst; | |
280 | struct inet6_dev *idev = rt->rt6i_idev; | |
281 | ||
8e2ec639 YZ |
282 | if (!(rt->dst.flags & DST_HOST)) |
283 | dst_destroy_metrics_generic(dst); | |
284 | ||
38308473 | 285 | if (idev) { |
1da177e4 LT |
286 | rt->rt6i_idev = NULL; |
287 | in6_dev_put(idev); | |
1ab1457c | 288 | } |
1716a961 G |
289 | |
290 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) | |
291 | dst_release(dst->from); | |
292 | ||
97bab73f DM |
293 | if (rt6_has_peer(rt)) { |
294 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
295 | inet_putpeer(peer); |
296 | } | |
297 | } | |
298 | ||
6431cbc2 DM |
299 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
300 | ||
301 | static u32 rt6_peer_genid(void) | |
302 | { | |
303 | return atomic_read(&__rt6_peer_genid); | |
304 | } | |
305 | ||
b3419363 DM |
306 | void rt6_bind_peer(struct rt6_info *rt, int create) |
307 | { | |
97bab73f | 308 | struct inet_peer_base *base; |
b3419363 DM |
309 | struct inet_peer *peer; |
310 | ||
97bab73f DM |
311 | base = inetpeer_base_ptr(rt->_rt6i_peer); |
312 | if (!base) | |
313 | return; | |
314 | ||
315 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
7b34ca2a DM |
316 | if (peer) { |
317 | if (!rt6_set_peer(rt, peer)) | |
318 | inet_putpeer(peer); | |
319 | else | |
320 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
321 | } | |
1da177e4 LT |
322 | } |
323 | ||
324 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
325 | int how) | |
326 | { | |
327 | struct rt6_info *rt = (struct rt6_info *)dst; | |
328 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 329 | struct net_device *loopback_dev = |
c346dca1 | 330 | dev_net(dev)->loopback_dev; |
1da177e4 | 331 | |
38308473 | 332 | if (dev != loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 DL |
333 | struct inet6_dev *loopback_idev = |
334 | in6_dev_get(loopback_dev); | |
38308473 | 335 | if (loopback_idev) { |
1da177e4 LT |
336 | rt->rt6i_idev = loopback_idev; |
337 | in6_dev_put(idev); | |
338 | } | |
339 | } | |
340 | } | |
341 | ||
a50feda5 | 342 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 343 | { |
1716a961 G |
344 | struct rt6_info *ort = NULL; |
345 | ||
346 | if (rt->rt6i_flags & RTF_EXPIRES) { | |
347 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 348 | return true; |
1716a961 G |
349 | } else if (rt->dst.from) { |
350 | ort = (struct rt6_info *) rt->dst.from; | |
351 | return (ort->rt6i_flags & RTF_EXPIRES) && | |
352 | time_after(jiffies, ort->dst.expires); | |
353 | } | |
a50feda5 | 354 | return false; |
1da177e4 LT |
355 | } |
356 | ||
a50feda5 | 357 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 358 | { |
a02cec21 ED |
359 | return ipv6_addr_type(daddr) & |
360 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
361 | } |
362 | ||
1da177e4 | 363 | /* |
c71099ac | 364 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
365 | */ |
366 | ||
8ed67789 DL |
367 | static inline struct rt6_info *rt6_device_match(struct net *net, |
368 | struct rt6_info *rt, | |
b71d1d42 | 369 | const struct in6_addr *saddr, |
1da177e4 | 370 | int oif, |
d420895e | 371 | int flags) |
1da177e4 LT |
372 | { |
373 | struct rt6_info *local = NULL; | |
374 | struct rt6_info *sprt; | |
375 | ||
dd3abc4e YH |
376 | if (!oif && ipv6_addr_any(saddr)) |
377 | goto out; | |
378 | ||
d8d1f30b | 379 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 380 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
381 | |
382 | if (oif) { | |
1da177e4 LT |
383 | if (dev->ifindex == oif) |
384 | return sprt; | |
385 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 386 | if (!sprt->rt6i_idev || |
1da177e4 | 387 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 388 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 389 | continue; |
1ab1457c | 390 | if (local && (!oif || |
1da177e4 LT |
391 | local->rt6i_idev->dev->ifindex == oif)) |
392 | continue; | |
393 | } | |
394 | local = sprt; | |
395 | } | |
dd3abc4e YH |
396 | } else { |
397 | if (ipv6_chk_addr(net, saddr, dev, | |
398 | flags & RT6_LOOKUP_F_IFACE)) | |
399 | return sprt; | |
1da177e4 | 400 | } |
dd3abc4e | 401 | } |
1da177e4 | 402 | |
dd3abc4e | 403 | if (oif) { |
1da177e4 LT |
404 | if (local) |
405 | return local; | |
406 | ||
d420895e | 407 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 408 | return net->ipv6.ip6_null_entry; |
1da177e4 | 409 | } |
dd3abc4e | 410 | out: |
1da177e4 LT |
411 | return rt; |
412 | } | |
413 | ||
27097255 YH |
414 | #ifdef CONFIG_IPV6_ROUTER_PREF |
415 | static void rt6_probe(struct rt6_info *rt) | |
416 | { | |
f2c31e32 | 417 | struct neighbour *neigh; |
27097255 YH |
418 | /* |
419 | * Okay, this does not seem to be appropriate | |
420 | * for now, however, we need to check if it | |
421 | * is really so; aka Router Reachability Probing. | |
422 | * | |
423 | * Router Reachability Probe MUST be rate-limited | |
424 | * to no more than one per minute. | |
425 | */ | |
f2c31e32 | 426 | rcu_read_lock(); |
27217455 | 427 | neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL; |
27097255 | 428 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
f2c31e32 | 429 | goto out; |
27097255 YH |
430 | read_lock_bh(&neigh->lock); |
431 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 432 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
433 | struct in6_addr mcaddr; |
434 | struct in6_addr *target; | |
435 | ||
436 | neigh->updated = jiffies; | |
437 | read_unlock_bh(&neigh->lock); | |
438 | ||
439 | target = (struct in6_addr *)&neigh->primary_key; | |
440 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 441 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 442 | } else { |
27097255 | 443 | read_unlock_bh(&neigh->lock); |
f2c31e32 ED |
444 | } |
445 | out: | |
446 | rcu_read_unlock(); | |
27097255 YH |
447 | } |
448 | #else | |
449 | static inline void rt6_probe(struct rt6_info *rt) | |
450 | { | |
27097255 YH |
451 | } |
452 | #endif | |
453 | ||
1da177e4 | 454 | /* |
554cfb7e | 455 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 456 | */ |
b6f99a21 | 457 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 458 | { |
d1918542 | 459 | struct net_device *dev = rt->dst.dev; |
161980f4 | 460 | if (!oif || dev->ifindex == oif) |
554cfb7e | 461 | return 2; |
161980f4 DM |
462 | if ((dev->flags & IFF_LOOPBACK) && |
463 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
464 | return 1; | |
465 | return 0; | |
554cfb7e | 466 | } |
1da177e4 | 467 | |
b6f99a21 | 468 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 469 | { |
f2c31e32 | 470 | struct neighbour *neigh; |
398bcbeb | 471 | int m; |
f2c31e32 ED |
472 | |
473 | rcu_read_lock(); | |
27217455 | 474 | neigh = dst_get_neighbour_noref(&rt->dst); |
4d0c5911 YH |
475 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
476 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
477 | m = 1; | |
478 | else if (neigh) { | |
554cfb7e YH |
479 | read_lock_bh(&neigh->lock); |
480 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 481 | m = 2; |
398bcbeb YH |
482 | #ifdef CONFIG_IPV6_ROUTER_PREF |
483 | else if (neigh->nud_state & NUD_FAILED) | |
484 | m = 0; | |
485 | #endif | |
486 | else | |
ea73ee23 | 487 | m = 1; |
554cfb7e | 488 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
489 | } else |
490 | m = 0; | |
f2c31e32 | 491 | rcu_read_unlock(); |
554cfb7e | 492 | return m; |
1da177e4 LT |
493 | } |
494 | ||
554cfb7e YH |
495 | static int rt6_score_route(struct rt6_info *rt, int oif, |
496 | int strict) | |
1da177e4 | 497 | { |
4d0c5911 | 498 | int m, n; |
1ab1457c | 499 | |
4d0c5911 | 500 | m = rt6_check_dev(rt, oif); |
77d16f45 | 501 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 502 | return -1; |
ebacaaa0 YH |
503 | #ifdef CONFIG_IPV6_ROUTER_PREF |
504 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
505 | #endif | |
4d0c5911 | 506 | n = rt6_check_neigh(rt); |
557e92ef | 507 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
508 | return -1; |
509 | return m; | |
510 | } | |
511 | ||
f11e6659 DM |
512 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
513 | int *mpri, struct rt6_info *match) | |
554cfb7e | 514 | { |
f11e6659 DM |
515 | int m; |
516 | ||
517 | if (rt6_check_expired(rt)) | |
518 | goto out; | |
519 | ||
520 | m = rt6_score_route(rt, oif, strict); | |
521 | if (m < 0) | |
522 | goto out; | |
523 | ||
524 | if (m > *mpri) { | |
525 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
526 | rt6_probe(match); | |
527 | *mpri = m; | |
528 | match = rt; | |
529 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
530 | rt6_probe(rt); | |
531 | } | |
532 | ||
533 | out: | |
534 | return match; | |
535 | } | |
536 | ||
537 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
538 | struct rt6_info *rr_head, | |
539 | u32 metric, int oif, int strict) | |
540 | { | |
541 | struct rt6_info *rt, *match; | |
554cfb7e | 542 | int mpri = -1; |
1da177e4 | 543 | |
f11e6659 DM |
544 | match = NULL; |
545 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 546 | rt = rt->dst.rt6_next) |
f11e6659 DM |
547 | match = find_match(rt, oif, strict, &mpri, match); |
548 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 549 | rt = rt->dst.rt6_next) |
f11e6659 | 550 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 551 | |
f11e6659 DM |
552 | return match; |
553 | } | |
1da177e4 | 554 | |
f11e6659 DM |
555 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
556 | { | |
557 | struct rt6_info *match, *rt0; | |
8ed67789 | 558 | struct net *net; |
1da177e4 | 559 | |
f11e6659 DM |
560 | rt0 = fn->rr_ptr; |
561 | if (!rt0) | |
562 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 563 | |
f11e6659 | 564 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 565 | |
554cfb7e | 566 | if (!match && |
f11e6659 | 567 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 568 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 569 | |
554cfb7e | 570 | /* no entries matched; do round-robin */ |
f11e6659 DM |
571 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
572 | next = fn->leaf; | |
573 | ||
574 | if (next != rt0) | |
575 | fn->rr_ptr = next; | |
1da177e4 | 576 | } |
1da177e4 | 577 | |
d1918542 | 578 | net = dev_net(rt0->dst.dev); |
a02cec21 | 579 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
580 | } |
581 | ||
70ceb4f5 YH |
582 | #ifdef CONFIG_IPV6_ROUTE_INFO |
583 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 584 | const struct in6_addr *gwaddr) |
70ceb4f5 | 585 | { |
c346dca1 | 586 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
587 | struct route_info *rinfo = (struct route_info *) opt; |
588 | struct in6_addr prefix_buf, *prefix; | |
589 | unsigned int pref; | |
4bed72e4 | 590 | unsigned long lifetime; |
70ceb4f5 YH |
591 | struct rt6_info *rt; |
592 | ||
593 | if (len < sizeof(struct route_info)) { | |
594 | return -EINVAL; | |
595 | } | |
596 | ||
597 | /* Sanity check for prefix_len and length */ | |
598 | if (rinfo->length > 3) { | |
599 | return -EINVAL; | |
600 | } else if (rinfo->prefix_len > 128) { | |
601 | return -EINVAL; | |
602 | } else if (rinfo->prefix_len > 64) { | |
603 | if (rinfo->length < 2) { | |
604 | return -EINVAL; | |
605 | } | |
606 | } else if (rinfo->prefix_len > 0) { | |
607 | if (rinfo->length < 1) { | |
608 | return -EINVAL; | |
609 | } | |
610 | } | |
611 | ||
612 | pref = rinfo->route_pref; | |
613 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 614 | return -EINVAL; |
70ceb4f5 | 615 | |
4bed72e4 | 616 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
617 | |
618 | if (rinfo->length == 3) | |
619 | prefix = (struct in6_addr *)rinfo->prefix; | |
620 | else { | |
621 | /* this function is safe */ | |
622 | ipv6_addr_prefix(&prefix_buf, | |
623 | (struct in6_addr *)rinfo->prefix, | |
624 | rinfo->prefix_len); | |
625 | prefix = &prefix_buf; | |
626 | } | |
627 | ||
efa2cea0 DL |
628 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
629 | dev->ifindex); | |
70ceb4f5 YH |
630 | |
631 | if (rt && !lifetime) { | |
e0a1ad73 | 632 | ip6_del_rt(rt); |
70ceb4f5 YH |
633 | rt = NULL; |
634 | } | |
635 | ||
636 | if (!rt && lifetime) | |
efa2cea0 | 637 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
638 | pref); |
639 | else if (rt) | |
640 | rt->rt6i_flags = RTF_ROUTEINFO | | |
641 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
642 | ||
643 | if (rt) { | |
1716a961 G |
644 | if (!addrconf_finite_timeout(lifetime)) |
645 | rt6_clean_expires(rt); | |
646 | else | |
647 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
648 | ||
d8d1f30b | 649 | dst_release(&rt->dst); |
70ceb4f5 YH |
650 | } |
651 | return 0; | |
652 | } | |
653 | #endif | |
654 | ||
8ed67789 | 655 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 656 | do { \ |
8ed67789 | 657 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 658 | struct fib6_node *pn; \ |
e0eda7bb | 659 | while (1) { \ |
982f56f3 YH |
660 | if (fn->fn_flags & RTN_TL_ROOT) \ |
661 | goto out; \ | |
662 | pn = fn->parent; \ | |
663 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 664 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
665 | else \ |
666 | fn = pn; \ | |
667 | if (fn->fn_flags & RTN_RTINFO) \ | |
668 | goto restart; \ | |
c71099ac | 669 | } \ |
c71099ac | 670 | } \ |
38308473 | 671 | } while (0) |
c71099ac | 672 | |
8ed67789 DL |
673 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
674 | struct fib6_table *table, | |
4c9483b2 | 675 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
676 | { |
677 | struct fib6_node *fn; | |
678 | struct rt6_info *rt; | |
679 | ||
c71099ac | 680 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 681 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
682 | restart: |
683 | rt = fn->leaf; | |
4c9483b2 DM |
684 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
685 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 686 | out: |
d8d1f30b | 687 | dst_use(&rt->dst, jiffies); |
c71099ac | 688 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
689 | return rt; |
690 | ||
691 | } | |
692 | ||
ea6e574e FW |
693 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
694 | int flags) | |
695 | { | |
696 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
697 | } | |
698 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
699 | ||
9acd9f3a YH |
700 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
701 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 702 | { |
4c9483b2 DM |
703 | struct flowi6 fl6 = { |
704 | .flowi6_oif = oif, | |
705 | .daddr = *daddr, | |
c71099ac TG |
706 | }; |
707 | struct dst_entry *dst; | |
77d16f45 | 708 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 709 | |
adaa70bb | 710 | if (saddr) { |
4c9483b2 | 711 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
712 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
713 | } | |
714 | ||
4c9483b2 | 715 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
716 | if (dst->error == 0) |
717 | return (struct rt6_info *) dst; | |
718 | ||
719 | dst_release(dst); | |
720 | ||
1da177e4 LT |
721 | return NULL; |
722 | } | |
723 | ||
7159039a YH |
724 | EXPORT_SYMBOL(rt6_lookup); |
725 | ||
c71099ac | 726 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
727 | It takes new route entry, the addition fails by any reason the |
728 | route is freed. In any case, if caller does not hold it, it may | |
729 | be destroyed. | |
730 | */ | |
731 | ||
86872cb5 | 732 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
733 | { |
734 | int err; | |
c71099ac | 735 | struct fib6_table *table; |
1da177e4 | 736 | |
c71099ac TG |
737 | table = rt->rt6i_table; |
738 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 739 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 740 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
741 | |
742 | return err; | |
743 | } | |
744 | ||
40e22e8f TG |
745 | int ip6_ins_rt(struct rt6_info *rt) |
746 | { | |
4d1169c1 | 747 | struct nl_info info = { |
d1918542 | 748 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 749 | }; |
528c4ceb | 750 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
751 | } |
752 | ||
1716a961 | 753 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 754 | const struct in6_addr *daddr, |
b71d1d42 | 755 | const struct in6_addr *saddr) |
1da177e4 | 756 | { |
1da177e4 LT |
757 | struct rt6_info *rt; |
758 | ||
759 | /* | |
760 | * Clone the route. | |
761 | */ | |
762 | ||
21efcfa0 | 763 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
764 | |
765 | if (rt) { | |
14deae41 DM |
766 | int attempts = !in_softirq(); |
767 | ||
38308473 | 768 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 769 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 770 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 771 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 772 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 773 | } |
1da177e4 | 774 | |
1da177e4 | 775 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
776 | |
777 | #ifdef CONFIG_IPV6_SUBTREES | |
778 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 779 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
780 | rt->rt6i_src.plen = 128; |
781 | } | |
782 | #endif | |
783 | ||
14deae41 | 784 | retry: |
8ade06c6 | 785 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
d1918542 | 786 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
787 | int saved_rt_min_interval = |
788 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
789 | int saved_rt_elasticity = | |
790 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
791 | ||
792 | if (attempts-- > 0) { | |
793 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
794 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
795 | ||
86393e52 | 796 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
797 | |
798 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
799 | saved_rt_elasticity; | |
800 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
801 | saved_rt_min_interval; | |
802 | goto retry; | |
803 | } | |
804 | ||
f3213831 | 805 | net_warn_ratelimited("Neighbour table overflow\n"); |
d8d1f30b | 806 | dst_free(&rt->dst); |
14deae41 DM |
807 | return NULL; |
808 | } | |
95a9a5ba | 809 | } |
1da177e4 | 810 | |
95a9a5ba YH |
811 | return rt; |
812 | } | |
1da177e4 | 813 | |
21efcfa0 ED |
814 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
815 | const struct in6_addr *daddr) | |
299d9939 | 816 | { |
21efcfa0 ED |
817 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
818 | ||
299d9939 | 819 | if (rt) { |
299d9939 | 820 | rt->rt6i_flags |= RTF_CACHE; |
27217455 | 821 | dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst))); |
299d9939 YH |
822 | } |
823 | return rt; | |
824 | } | |
825 | ||
8ed67789 | 826 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 827 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
828 | { |
829 | struct fib6_node *fn; | |
519fbd87 | 830 | struct rt6_info *rt, *nrt; |
c71099ac | 831 | int strict = 0; |
1da177e4 | 832 | int attempts = 3; |
519fbd87 | 833 | int err; |
53b7997f | 834 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 835 | |
77d16f45 | 836 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
837 | |
838 | relookup: | |
c71099ac | 839 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 840 | |
8238dd06 | 841 | restart_2: |
4c9483b2 | 842 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
843 | |
844 | restart: | |
4acad72d | 845 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 846 | |
4c9483b2 | 847 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 848 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 849 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 850 | goto out; |
1da177e4 | 851 | |
d8d1f30b | 852 | dst_hold(&rt->dst); |
c71099ac | 853 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 854 | |
27217455 | 855 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 856 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 857 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 858 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
859 | else |
860 | goto out2; | |
e40cf353 | 861 | |
d8d1f30b | 862 | dst_release(&rt->dst); |
8ed67789 | 863 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 864 | |
d8d1f30b | 865 | dst_hold(&rt->dst); |
519fbd87 | 866 | if (nrt) { |
40e22e8f | 867 | err = ip6_ins_rt(nrt); |
519fbd87 | 868 | if (!err) |
1da177e4 | 869 | goto out2; |
1da177e4 | 870 | } |
1da177e4 | 871 | |
519fbd87 YH |
872 | if (--attempts <= 0) |
873 | goto out2; | |
874 | ||
875 | /* | |
c71099ac | 876 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
877 | * released someone could insert this route. Relookup. |
878 | */ | |
d8d1f30b | 879 | dst_release(&rt->dst); |
519fbd87 YH |
880 | goto relookup; |
881 | ||
882 | out: | |
8238dd06 YH |
883 | if (reachable) { |
884 | reachable = 0; | |
885 | goto restart_2; | |
886 | } | |
d8d1f30b | 887 | dst_hold(&rt->dst); |
c71099ac | 888 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 889 | out2: |
d8d1f30b CG |
890 | rt->dst.lastuse = jiffies; |
891 | rt->dst.__use++; | |
c71099ac TG |
892 | |
893 | return rt; | |
1da177e4 LT |
894 | } |
895 | ||
8ed67789 | 896 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 897 | struct flowi6 *fl6, int flags) |
4acad72d | 898 | { |
4c9483b2 | 899 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
900 | } |
901 | ||
72331bc0 SL |
902 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
903 | struct net_device *dev, | |
904 | struct flowi6 *fl6, int flags) | |
905 | { | |
906 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
907 | flags |= RT6_LOOKUP_F_IFACE; | |
908 | ||
909 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
910 | } | |
911 | ||
c71099ac TG |
912 | void ip6_route_input(struct sk_buff *skb) |
913 | { | |
b71d1d42 | 914 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 915 | struct net *net = dev_net(skb->dev); |
adaa70bb | 916 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
917 | struct flowi6 fl6 = { |
918 | .flowi6_iif = skb->dev->ifindex, | |
919 | .daddr = iph->daddr, | |
920 | .saddr = iph->saddr, | |
38308473 | 921 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
922 | .flowi6_mark = skb->mark, |
923 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 924 | }; |
adaa70bb | 925 | |
72331bc0 | 926 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
927 | } |
928 | ||
8ed67789 | 929 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 930 | struct flowi6 *fl6, int flags) |
1da177e4 | 931 | { |
4c9483b2 | 932 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
933 | } |
934 | ||
9c7a4f9c | 935 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 936 | struct flowi6 *fl6) |
c71099ac TG |
937 | { |
938 | int flags = 0; | |
939 | ||
4c9483b2 | 940 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 941 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 942 | |
4c9483b2 | 943 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 944 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
945 | else if (sk) |
946 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 947 | |
4c9483b2 | 948 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
949 | } |
950 | ||
7159039a | 951 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 952 | |
2774c131 | 953 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 954 | { |
5c1e6aa3 | 955 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
956 | struct dst_entry *new = NULL; |
957 | ||
5c1e6aa3 | 958 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 959 | if (rt) { |
cf911662 | 960 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
97bab73f | 961 | rt6_init_peer(rt, net->ipv6.peers); |
cf911662 | 962 | |
d8d1f30b | 963 | new = &rt->dst; |
14e50e57 | 964 | |
14e50e57 | 965 | new->__use = 1; |
352e512c HX |
966 | new->input = dst_discard; |
967 | new->output = dst_discard; | |
14e50e57 | 968 | |
21efcfa0 ED |
969 | if (dst_metrics_read_only(&ort->dst)) |
970 | new->_metrics = ort->dst._metrics; | |
971 | else | |
972 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
973 | rt->rt6i_idev = ort->rt6i_idev; |
974 | if (rt->rt6i_idev) | |
975 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 976 | |
4e3fd7a0 | 977 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
978 | rt->rt6i_flags = ort->rt6i_flags; |
979 | rt6_clean_expires(rt); | |
14e50e57 DM |
980 | rt->rt6i_metric = 0; |
981 | ||
982 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
983 | #ifdef CONFIG_IPV6_SUBTREES | |
984 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
985 | #endif | |
986 | ||
987 | dst_free(new); | |
988 | } | |
989 | ||
69ead7af DM |
990 | dst_release(dst_orig); |
991 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 992 | } |
14e50e57 | 993 | |
1da177e4 LT |
994 | /* |
995 | * Destination cache support functions | |
996 | */ | |
997 | ||
998 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
999 | { | |
1000 | struct rt6_info *rt; | |
1001 | ||
1002 | rt = (struct rt6_info *) dst; | |
1003 | ||
6431cbc2 DM |
1004 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
1005 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
97bab73f | 1006 | if (!rt6_has_peer(rt)) |
6431cbc2 DM |
1007 | rt6_bind_peer(rt, 0); |
1008 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1009 | } | |
1da177e4 | 1010 | return dst; |
6431cbc2 | 1011 | } |
1da177e4 LT |
1012 | return NULL; |
1013 | } | |
1014 | ||
1015 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1016 | { | |
1017 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1018 | ||
1019 | if (rt) { | |
54c1a859 YH |
1020 | if (rt->rt6i_flags & RTF_CACHE) { |
1021 | if (rt6_check_expired(rt)) { | |
1022 | ip6_del_rt(rt); | |
1023 | dst = NULL; | |
1024 | } | |
1025 | } else { | |
1da177e4 | 1026 | dst_release(dst); |
54c1a859 YH |
1027 | dst = NULL; |
1028 | } | |
1da177e4 | 1029 | } |
54c1a859 | 1030 | return dst; |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | static void ip6_link_failure(struct sk_buff *skb) | |
1034 | { | |
1035 | struct rt6_info *rt; | |
1036 | ||
3ffe533c | 1037 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1038 | |
adf30907 | 1039 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1040 | if (rt) { |
1716a961 G |
1041 | if (rt->rt6i_flags & RTF_CACHE) |
1042 | rt6_update_expires(rt, 0); | |
1043 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1da177e4 LT |
1044 | rt->rt6i_node->fn_sernum = -1; |
1045 | } | |
1046 | } | |
1047 | ||
1048 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1049 | { | |
1050 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1051 | ||
81aded24 | 1052 | dst_confirm(dst); |
1da177e4 | 1053 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1054 | struct net *net = dev_net(dst->dev); |
1055 | ||
1da177e4 LT |
1056 | rt6->rt6i_flags |= RTF_MODIFIED; |
1057 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1058 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1059 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1060 | features |= RTAX_FEATURE_ALLFRAG; |
1061 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1062 | } |
defb3519 | 1063 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1064 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1065 | } |
1066 | } | |
1067 | ||
81aded24 DM |
1068 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
1069 | int oif, __be32 mark) | |
1070 | { | |
1071 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1072 | struct dst_entry *dst; | |
1073 | struct flowi6 fl6; | |
1074 | ||
1075 | memset(&fl6, 0, sizeof(fl6)); | |
1076 | fl6.flowi6_oif = oif; | |
1077 | fl6.flowi6_mark = mark; | |
1078 | fl6.flowi6_flags = FLOWI_FLAG_PRECOW_METRICS; | |
1079 | fl6.daddr = iph->daddr; | |
1080 | fl6.saddr = iph->saddr; | |
1081 | fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; | |
1082 | ||
1083 | dst = ip6_route_output(net, NULL, &fl6); | |
1084 | if (!dst->error) | |
1085 | ip6_rt_update_pmtu(dst, ntohl(mtu)); | |
1086 | dst_release(dst); | |
1087 | } | |
1088 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1089 | ||
1090 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1091 | { | |
1092 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1093 | sk->sk_bound_dev_if, sk->sk_mark); | |
1094 | } | |
1095 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1096 | ||
0dbaee3b | 1097 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1098 | { |
0dbaee3b DM |
1099 | struct net_device *dev = dst->dev; |
1100 | unsigned int mtu = dst_mtu(dst); | |
1101 | struct net *net = dev_net(dev); | |
1102 | ||
1da177e4 LT |
1103 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1104 | ||
5578689a DL |
1105 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1106 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1107 | |
1108 | /* | |
1ab1457c YH |
1109 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1110 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1111 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1112 | * rely only on pmtu discovery" |
1113 | */ | |
1114 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1115 | mtu = IPV6_MAXPLEN; | |
1116 | return mtu; | |
1117 | } | |
1118 | ||
ebb762f2 | 1119 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1120 | { |
d33e4553 | 1121 | struct inet6_dev *idev; |
618f9bc7 SK |
1122 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1123 | ||
1124 | if (mtu) | |
1125 | return mtu; | |
1126 | ||
1127 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1128 | |
1129 | rcu_read_lock(); | |
1130 | idev = __in6_dev_get(dst->dev); | |
1131 | if (idev) | |
1132 | mtu = idev->cnf.mtu6; | |
1133 | rcu_read_unlock(); | |
1134 | ||
1135 | return mtu; | |
1136 | } | |
1137 | ||
3b00944c YH |
1138 | static struct dst_entry *icmp6_dst_gc_list; |
1139 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1140 | |
3b00944c | 1141 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1142 | struct neighbour *neigh, |
87a11578 | 1143 | struct flowi6 *fl6) |
1da177e4 | 1144 | { |
87a11578 | 1145 | struct dst_entry *dst; |
1da177e4 LT |
1146 | struct rt6_info *rt; |
1147 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1148 | struct net *net = dev_net(dev); |
1da177e4 | 1149 | |
38308473 | 1150 | if (unlikely(!idev)) |
122bdf67 | 1151 | return ERR_PTR(-ENODEV); |
1da177e4 | 1152 | |
8b96d22d | 1153 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1154 | if (unlikely(!rt)) { |
1da177e4 | 1155 | in6_dev_put(idev); |
87a11578 | 1156 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1157 | goto out; |
1158 | } | |
1159 | ||
1da177e4 LT |
1160 | if (neigh) |
1161 | neigh_hold(neigh); | |
14deae41 | 1162 | else { |
f83c7790 | 1163 | neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr); |
b43faac6 | 1164 | if (IS_ERR(neigh)) { |
252c3d84 | 1165 | in6_dev_put(idev); |
b43faac6 DM |
1166 | dst_free(&rt->dst); |
1167 | return ERR_CAST(neigh); | |
1168 | } | |
14deae41 | 1169 | } |
1da177e4 | 1170 | |
8e2ec639 YZ |
1171 | rt->dst.flags |= DST_HOST; |
1172 | rt->dst.output = ip6_output; | |
69cce1d1 | 1173 | dst_set_neighbour(&rt->dst, neigh); |
d8d1f30b | 1174 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1175 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1176 | rt->rt6i_dst.plen = 128; |
1177 | rt->rt6i_idev = idev; | |
7011687f | 1178 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1179 | |
3b00944c | 1180 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1181 | rt->dst.next = icmp6_dst_gc_list; |
1182 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1183 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1184 | |
5578689a | 1185 | fib6_force_start_gc(net); |
1da177e4 | 1186 | |
87a11578 DM |
1187 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1188 | ||
1da177e4 | 1189 | out: |
87a11578 | 1190 | return dst; |
1da177e4 LT |
1191 | } |
1192 | ||
3d0f24a7 | 1193 | int icmp6_dst_gc(void) |
1da177e4 | 1194 | { |
e9476e95 | 1195 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1196 | int more = 0; |
1da177e4 | 1197 | |
3b00944c YH |
1198 | spin_lock_bh(&icmp6_dst_lock); |
1199 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1200 | |
1da177e4 LT |
1201 | while ((dst = *pprev) != NULL) { |
1202 | if (!atomic_read(&dst->__refcnt)) { | |
1203 | *pprev = dst->next; | |
1204 | dst_free(dst); | |
1da177e4 LT |
1205 | } else { |
1206 | pprev = &dst->next; | |
3d0f24a7 | 1207 | ++more; |
1da177e4 LT |
1208 | } |
1209 | } | |
1210 | ||
3b00944c | 1211 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1212 | |
3d0f24a7 | 1213 | return more; |
1da177e4 LT |
1214 | } |
1215 | ||
1e493d19 DM |
1216 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1217 | void *arg) | |
1218 | { | |
1219 | struct dst_entry *dst, **pprev; | |
1220 | ||
1221 | spin_lock_bh(&icmp6_dst_lock); | |
1222 | pprev = &icmp6_dst_gc_list; | |
1223 | while ((dst = *pprev) != NULL) { | |
1224 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1225 | if (func(rt, arg)) { | |
1226 | *pprev = dst->next; | |
1227 | dst_free(dst); | |
1228 | } else { | |
1229 | pprev = &dst->next; | |
1230 | } | |
1231 | } | |
1232 | spin_unlock_bh(&icmp6_dst_lock); | |
1233 | } | |
1234 | ||
569d3645 | 1235 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1236 | { |
1da177e4 | 1237 | unsigned long now = jiffies; |
86393e52 | 1238 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1239 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1240 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1241 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1242 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1243 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1244 | int entries; |
7019b78e | 1245 | |
fc66f95c | 1246 | entries = dst_entries_get_fast(ops); |
7019b78e | 1247 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1248 | entries <= rt_max_size) |
1da177e4 LT |
1249 | goto out; |
1250 | ||
6891a346 BT |
1251 | net->ipv6.ip6_rt_gc_expire++; |
1252 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1253 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1254 | entries = dst_entries_get_slow(ops); |
1255 | if (entries < ops->gc_thresh) | |
7019b78e | 1256 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1257 | out: |
7019b78e | 1258 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1259 | return entries > rt_max_size; |
1da177e4 LT |
1260 | } |
1261 | ||
1262 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1263 | but results in cleaner routing tables. | |
1264 | ||
1265 | Remove it only when all the things will work! | |
1266 | */ | |
1267 | ||
6b75d090 | 1268 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1269 | { |
5170ae82 | 1270 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1271 | if (hoplimit == 0) { |
6b75d090 | 1272 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1273 | struct inet6_dev *idev; |
1274 | ||
1275 | rcu_read_lock(); | |
1276 | idev = __in6_dev_get(dev); | |
1277 | if (idev) | |
6b75d090 | 1278 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1279 | else |
53b7997f | 1280 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1281 | rcu_read_unlock(); |
1da177e4 LT |
1282 | } |
1283 | return hoplimit; | |
1284 | } | |
abbf46ae | 1285 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1286 | |
1287 | /* | |
1288 | * | |
1289 | */ | |
1290 | ||
86872cb5 | 1291 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1292 | { |
1293 | int err; | |
5578689a | 1294 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1295 | struct rt6_info *rt = NULL; |
1296 | struct net_device *dev = NULL; | |
1297 | struct inet6_dev *idev = NULL; | |
c71099ac | 1298 | struct fib6_table *table; |
1da177e4 LT |
1299 | int addr_type; |
1300 | ||
86872cb5 | 1301 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1302 | return -EINVAL; |
1303 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1304 | if (cfg->fc_src_len) |
1da177e4 LT |
1305 | return -EINVAL; |
1306 | #endif | |
86872cb5 | 1307 | if (cfg->fc_ifindex) { |
1da177e4 | 1308 | err = -ENODEV; |
5578689a | 1309 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1310 | if (!dev) |
1311 | goto out; | |
1312 | idev = in6_dev_get(dev); | |
1313 | if (!idev) | |
1314 | goto out; | |
1315 | } | |
1316 | ||
86872cb5 TG |
1317 | if (cfg->fc_metric == 0) |
1318 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1319 | |
d71314b4 | 1320 | err = -ENOBUFS; |
38308473 DM |
1321 | if (cfg->fc_nlinfo.nlh && |
1322 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1323 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1324 | if (!table) { |
f3213831 | 1325 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1326 | table = fib6_new_table(net, cfg->fc_table); |
1327 | } | |
1328 | } else { | |
1329 | table = fib6_new_table(net, cfg->fc_table); | |
1330 | } | |
38308473 DM |
1331 | |
1332 | if (!table) | |
c71099ac | 1333 | goto out; |
c71099ac | 1334 | |
8b96d22d | 1335 | rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table); |
1da177e4 | 1336 | |
38308473 | 1337 | if (!rt) { |
1da177e4 LT |
1338 | err = -ENOMEM; |
1339 | goto out; | |
1340 | } | |
1341 | ||
d8d1f30b | 1342 | rt->dst.obsolete = -1; |
1716a961 G |
1343 | |
1344 | if (cfg->fc_flags & RTF_EXPIRES) | |
1345 | rt6_set_expires(rt, jiffies + | |
1346 | clock_t_to_jiffies(cfg->fc_expires)); | |
1347 | else | |
1348 | rt6_clean_expires(rt); | |
1da177e4 | 1349 | |
86872cb5 TG |
1350 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1351 | cfg->fc_protocol = RTPROT_BOOT; | |
1352 | rt->rt6i_protocol = cfg->fc_protocol; | |
1353 | ||
1354 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1355 | |
1356 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1357 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1358 | else if (cfg->fc_flags & RTF_LOCAL) |
1359 | rt->dst.input = ip6_input; | |
1da177e4 | 1360 | else |
d8d1f30b | 1361 | rt->dst.input = ip6_forward; |
1da177e4 | 1362 | |
d8d1f30b | 1363 | rt->dst.output = ip6_output; |
1da177e4 | 1364 | |
86872cb5 TG |
1365 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1366 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1367 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1368 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1369 | |
8e2ec639 YZ |
1370 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1371 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1372 | if (!metrics) { | |
1373 | err = -ENOMEM; | |
1374 | goto out; | |
1375 | } | |
1376 | dst_init_metrics(&rt->dst, metrics, 0); | |
1377 | } | |
1da177e4 | 1378 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1379 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1380 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1381 | #endif |
1382 | ||
86872cb5 | 1383 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1384 | |
1385 | /* We cannot add true routes via loopback here, | |
1386 | they would result in kernel looping; promote them to reject routes | |
1387 | */ | |
86872cb5 | 1388 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1389 | (dev && (dev->flags & IFF_LOOPBACK) && |
1390 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1391 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1392 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1393 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1394 | if (dev) { |
1395 | dev_put(dev); | |
1396 | in6_dev_put(idev); | |
1397 | } | |
5578689a | 1398 | dev = net->loopback_dev; |
1da177e4 LT |
1399 | dev_hold(dev); |
1400 | idev = in6_dev_get(dev); | |
1401 | if (!idev) { | |
1402 | err = -ENODEV; | |
1403 | goto out; | |
1404 | } | |
1405 | } | |
d8d1f30b CG |
1406 | rt->dst.output = ip6_pkt_discard_out; |
1407 | rt->dst.input = ip6_pkt_discard; | |
1408 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1409 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1410 | goto install_route; | |
1411 | } | |
1412 | ||
86872cb5 | 1413 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1414 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1415 | int gwa_type; |
1416 | ||
86872cb5 | 1417 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1418 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1419 | gwa_type = ipv6_addr_type(gw_addr); |
1420 | ||
1421 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1422 | struct rt6_info *grt; | |
1423 | ||
1424 | /* IPv6 strictly inhibits using not link-local | |
1425 | addresses as nexthop address. | |
1426 | Otherwise, router will not able to send redirects. | |
1427 | It is very good, but in some (rare!) circumstances | |
1428 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1429 | some exceptions. --ANK | |
1430 | */ | |
1431 | err = -EINVAL; | |
38308473 | 1432 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1433 | goto out; |
1434 | ||
5578689a | 1435 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1436 | |
1437 | err = -EHOSTUNREACH; | |
38308473 | 1438 | if (!grt) |
1da177e4 LT |
1439 | goto out; |
1440 | if (dev) { | |
d1918542 | 1441 | if (dev != grt->dst.dev) { |
d8d1f30b | 1442 | dst_release(&grt->dst); |
1da177e4 LT |
1443 | goto out; |
1444 | } | |
1445 | } else { | |
d1918542 | 1446 | dev = grt->dst.dev; |
1da177e4 LT |
1447 | idev = grt->rt6i_idev; |
1448 | dev_hold(dev); | |
1449 | in6_dev_hold(grt->rt6i_idev); | |
1450 | } | |
38308473 | 1451 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1452 | err = 0; |
d8d1f30b | 1453 | dst_release(&grt->dst); |
1da177e4 LT |
1454 | |
1455 | if (err) | |
1456 | goto out; | |
1457 | } | |
1458 | err = -EINVAL; | |
38308473 | 1459 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1460 | goto out; |
1461 | } | |
1462 | ||
1463 | err = -ENODEV; | |
38308473 | 1464 | if (!dev) |
1da177e4 LT |
1465 | goto out; |
1466 | ||
c3968a85 DW |
1467 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1468 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1469 | err = -EINVAL; | |
1470 | goto out; | |
1471 | } | |
4e3fd7a0 | 1472 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1473 | rt->rt6i_prefsrc.plen = 128; |
1474 | } else | |
1475 | rt->rt6i_prefsrc.plen = 0; | |
1476 | ||
86872cb5 | 1477 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
8ade06c6 | 1478 | err = rt6_bind_neighbour(rt, dev); |
f83c7790 | 1479 | if (err) |
1da177e4 | 1480 | goto out; |
1da177e4 LT |
1481 | } |
1482 | ||
86872cb5 | 1483 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1484 | |
1485 | install_route: | |
86872cb5 TG |
1486 | if (cfg->fc_mx) { |
1487 | struct nlattr *nla; | |
1488 | int remaining; | |
1489 | ||
1490 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1491 | int type = nla_type(nla); |
86872cb5 TG |
1492 | |
1493 | if (type) { | |
1494 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1495 | err = -EINVAL; |
1496 | goto out; | |
1497 | } | |
86872cb5 | 1498 | |
defb3519 | 1499 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1500 | } |
1da177e4 LT |
1501 | } |
1502 | } | |
1503 | ||
d8d1f30b | 1504 | rt->dst.dev = dev; |
1da177e4 | 1505 | rt->rt6i_idev = idev; |
c71099ac | 1506 | rt->rt6i_table = table; |
63152fc0 | 1507 | |
c346dca1 | 1508 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1509 | |
86872cb5 | 1510 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1511 | |
1512 | out: | |
1513 | if (dev) | |
1514 | dev_put(dev); | |
1515 | if (idev) | |
1516 | in6_dev_put(idev); | |
1517 | if (rt) | |
d8d1f30b | 1518 | dst_free(&rt->dst); |
1da177e4 LT |
1519 | return err; |
1520 | } | |
1521 | ||
86872cb5 | 1522 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1523 | { |
1524 | int err; | |
c71099ac | 1525 | struct fib6_table *table; |
d1918542 | 1526 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1527 | |
8ed67789 | 1528 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1529 | return -ENOENT; |
1530 | ||
c71099ac TG |
1531 | table = rt->rt6i_table; |
1532 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1533 | |
86872cb5 | 1534 | err = fib6_del(rt, info); |
d8d1f30b | 1535 | dst_release(&rt->dst); |
1da177e4 | 1536 | |
c71099ac | 1537 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1538 | |
1539 | return err; | |
1540 | } | |
1541 | ||
e0a1ad73 TG |
1542 | int ip6_del_rt(struct rt6_info *rt) |
1543 | { | |
4d1169c1 | 1544 | struct nl_info info = { |
d1918542 | 1545 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1546 | }; |
528c4ceb | 1547 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1548 | } |
1549 | ||
86872cb5 | 1550 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1551 | { |
c71099ac | 1552 | struct fib6_table *table; |
1da177e4 LT |
1553 | struct fib6_node *fn; |
1554 | struct rt6_info *rt; | |
1555 | int err = -ESRCH; | |
1556 | ||
5578689a | 1557 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1558 | if (!table) |
c71099ac TG |
1559 | return err; |
1560 | ||
1561 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1562 | |
c71099ac | 1563 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1564 | &cfg->fc_dst, cfg->fc_dst_len, |
1565 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1566 | |
1da177e4 | 1567 | if (fn) { |
d8d1f30b | 1568 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1569 | if (cfg->fc_ifindex && |
d1918542 DM |
1570 | (!rt->dst.dev || |
1571 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1572 | continue; |
86872cb5 TG |
1573 | if (cfg->fc_flags & RTF_GATEWAY && |
1574 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1575 | continue; |
86872cb5 | 1576 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1577 | continue; |
d8d1f30b | 1578 | dst_hold(&rt->dst); |
c71099ac | 1579 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1580 | |
86872cb5 | 1581 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1582 | } |
1583 | } | |
c71099ac | 1584 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1585 | |
1586 | return err; | |
1587 | } | |
1588 | ||
1589 | /* | |
1590 | * Handle redirects | |
1591 | */ | |
a6279458 | 1592 | struct ip6rd_flowi { |
4c9483b2 | 1593 | struct flowi6 fl6; |
a6279458 YH |
1594 | struct in6_addr gateway; |
1595 | }; | |
1596 | ||
8ed67789 DL |
1597 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1598 | struct fib6_table *table, | |
4c9483b2 | 1599 | struct flowi6 *fl6, |
a6279458 | 1600 | int flags) |
1da177e4 | 1601 | { |
4c9483b2 | 1602 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
a6279458 | 1603 | struct rt6_info *rt; |
e843b9e1 | 1604 | struct fib6_node *fn; |
c71099ac | 1605 | |
1da177e4 | 1606 | /* |
e843b9e1 YH |
1607 | * Get the "current" route for this destination and |
1608 | * check if the redirect has come from approriate router. | |
1609 | * | |
1610 | * RFC 2461 specifies that redirects should only be | |
1611 | * accepted if they come from the nexthop to the target. | |
1612 | * Due to the way the routes are chosen, this notion | |
1613 | * is a bit fuzzy and one might need to check all possible | |
1614 | * routes. | |
1da177e4 | 1615 | */ |
1da177e4 | 1616 | |
c71099ac | 1617 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 1618 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
e843b9e1 | 1619 | restart: |
d8d1f30b | 1620 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1621 | /* |
1622 | * Current route is on-link; redirect is always invalid. | |
1623 | * | |
1624 | * Seems, previous statement is not true. It could | |
1625 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1626 | * But then router serving it might decide, that we should | |
1627 | * know truth 8)8) --ANK (980726). | |
1628 | */ | |
1629 | if (rt6_check_expired(rt)) | |
1630 | continue; | |
1631 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1632 | continue; | |
d1918542 | 1633 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) |
e843b9e1 | 1634 | continue; |
a6279458 | 1635 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1636 | continue; |
1637 | break; | |
1638 | } | |
a6279458 | 1639 | |
cb15d9c2 | 1640 | if (!rt) |
8ed67789 | 1641 | rt = net->ipv6.ip6_null_entry; |
4c9483b2 | 1642 | BACKTRACK(net, &fl6->saddr); |
cb15d9c2 | 1643 | out: |
d8d1f30b | 1644 | dst_hold(&rt->dst); |
a6279458 | 1645 | |
c71099ac | 1646 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1647 | |
a6279458 YH |
1648 | return rt; |
1649 | }; | |
1650 | ||
b71d1d42 ED |
1651 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
1652 | const struct in6_addr *src, | |
1653 | const struct in6_addr *gateway, | |
a6279458 YH |
1654 | struct net_device *dev) |
1655 | { | |
adaa70bb | 1656 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1657 | struct net *net = dev_net(dev); |
a6279458 | 1658 | struct ip6rd_flowi rdfl = { |
4c9483b2 DM |
1659 | .fl6 = { |
1660 | .flowi6_oif = dev->ifindex, | |
1661 | .daddr = *dest, | |
1662 | .saddr = *src, | |
a6279458 | 1663 | }, |
a6279458 | 1664 | }; |
adaa70bb | 1665 | |
4e3fd7a0 | 1666 | rdfl.gateway = *gateway; |
86c36ce4 | 1667 | |
adaa70bb TG |
1668 | if (rt6_need_strict(dest)) |
1669 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1670 | |
4c9483b2 | 1671 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
58f09b78 | 1672 | flags, __ip6_route_redirect); |
a6279458 YH |
1673 | } |
1674 | ||
b71d1d42 ED |
1675 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
1676 | const struct in6_addr *saddr, | |
a6279458 YH |
1677 | struct neighbour *neigh, u8 *lladdr, int on_link) |
1678 | { | |
1679 | struct rt6_info *rt, *nrt = NULL; | |
1680 | struct netevent_redirect netevent; | |
c346dca1 | 1681 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1682 | |
1683 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1684 | ||
8ed67789 | 1685 | if (rt == net->ipv6.ip6_null_entry) { |
e87cc472 | 1686 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
a6279458 | 1687 | goto out; |
1da177e4 LT |
1688 | } |
1689 | ||
1da177e4 LT |
1690 | /* |
1691 | * We have finally decided to accept it. | |
1692 | */ | |
1693 | ||
1ab1457c | 1694 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1695 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1696 | NEIGH_UPDATE_F_OVERRIDE| | |
1697 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1698 | NEIGH_UPDATE_F_ISROUTER)) | |
1699 | ); | |
1700 | ||
1701 | /* | |
1702 | * Redirect received -> path was valid. | |
1703 | * Look, redirects are sent only in response to data packets, | |
1704 | * so that this nexthop apparently is reachable. --ANK | |
1705 | */ | |
d8d1f30b | 1706 | dst_confirm(&rt->dst); |
1da177e4 LT |
1707 | |
1708 | /* Duplicate redirect: silently ignore. */ | |
27217455 | 1709 | if (neigh == dst_get_neighbour_noref_raw(&rt->dst)) |
1da177e4 LT |
1710 | goto out; |
1711 | ||
21efcfa0 | 1712 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1713 | if (!nrt) |
1da177e4 LT |
1714 | goto out; |
1715 | ||
1716 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1717 | if (on_link) | |
1718 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1719 | ||
4e3fd7a0 | 1720 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
69cce1d1 | 1721 | dst_set_neighbour(&nrt->dst, neigh_clone(neigh)); |
1da177e4 | 1722 | |
40e22e8f | 1723 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1724 | goto out; |
1725 | ||
d8d1f30b CG |
1726 | netevent.old = &rt->dst; |
1727 | netevent.new = &nrt->dst; | |
8d71740c TT |
1728 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1729 | ||
38308473 | 1730 | if (rt->rt6i_flags & RTF_CACHE) { |
e0a1ad73 | 1731 | ip6_del_rt(rt); |
1da177e4 LT |
1732 | return; |
1733 | } | |
1734 | ||
1735 | out: | |
d8d1f30b | 1736 | dst_release(&rt->dst); |
1da177e4 LT |
1737 | } |
1738 | ||
1da177e4 LT |
1739 | /* |
1740 | * Misc support functions | |
1741 | */ | |
1742 | ||
1716a961 | 1743 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1744 | const struct in6_addr *dest) |
1da177e4 | 1745 | { |
d1918542 | 1746 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1747 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1748 | ort->rt6i_table); | |
1da177e4 LT |
1749 | |
1750 | if (rt) { | |
d8d1f30b CG |
1751 | rt->dst.input = ort->dst.input; |
1752 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1753 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1754 | |
4e3fd7a0 | 1755 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1756 | rt->rt6i_dst.plen = 128; |
defb3519 | 1757 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1758 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1759 | rt->rt6i_idev = ort->rt6i_idev; |
1760 | if (rt->rt6i_idev) | |
1761 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1762 | rt->dst.lastuse = jiffies; |
1da177e4 | 1763 | |
4e3fd7a0 | 1764 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1765 | rt->rt6i_flags = ort->rt6i_flags; |
1766 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1767 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1768 | rt6_set_from(rt, ort); | |
1769 | else | |
1770 | rt6_clean_expires(rt); | |
1da177e4 LT |
1771 | rt->rt6i_metric = 0; |
1772 | ||
1da177e4 LT |
1773 | #ifdef CONFIG_IPV6_SUBTREES |
1774 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1775 | #endif | |
0f6c6392 | 1776 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1777 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1778 | } |
1779 | return rt; | |
1780 | } | |
1781 | ||
70ceb4f5 | 1782 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1783 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1784 | const struct in6_addr *prefix, int prefixlen, |
1785 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1786 | { |
1787 | struct fib6_node *fn; | |
1788 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1789 | struct fib6_table *table; |
1790 | ||
efa2cea0 | 1791 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1792 | if (!table) |
c71099ac | 1793 | return NULL; |
70ceb4f5 | 1794 | |
c71099ac TG |
1795 | write_lock_bh(&table->tb6_lock); |
1796 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1797 | if (!fn) |
1798 | goto out; | |
1799 | ||
d8d1f30b | 1800 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1801 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1802 | continue; |
1803 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1804 | continue; | |
1805 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1806 | continue; | |
d8d1f30b | 1807 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1808 | break; |
1809 | } | |
1810 | out: | |
c71099ac | 1811 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1812 | return rt; |
1813 | } | |
1814 | ||
efa2cea0 | 1815 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1816 | const struct in6_addr *prefix, int prefixlen, |
1817 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1818 | unsigned int pref) |
70ceb4f5 | 1819 | { |
86872cb5 TG |
1820 | struct fib6_config cfg = { |
1821 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1822 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1823 | .fc_ifindex = ifindex, |
1824 | .fc_dst_len = prefixlen, | |
1825 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1826 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1827 | .fc_nlinfo.pid = 0, |
1828 | .fc_nlinfo.nlh = NULL, | |
1829 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1830 | }; |
1831 | ||
4e3fd7a0 AD |
1832 | cfg.fc_dst = *prefix; |
1833 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1834 | |
e317da96 YH |
1835 | /* We should treat it as a default route if prefix length is 0. */ |
1836 | if (!prefixlen) | |
86872cb5 | 1837 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1838 | |
86872cb5 | 1839 | ip6_route_add(&cfg); |
70ceb4f5 | 1840 | |
efa2cea0 | 1841 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1842 | } |
1843 | #endif | |
1844 | ||
b71d1d42 | 1845 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1846 | { |
1da177e4 | 1847 | struct rt6_info *rt; |
c71099ac | 1848 | struct fib6_table *table; |
1da177e4 | 1849 | |
c346dca1 | 1850 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1851 | if (!table) |
c71099ac | 1852 | return NULL; |
1da177e4 | 1853 | |
c71099ac | 1854 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1855 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1856 | if (dev == rt->dst.dev && |
045927ff | 1857 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1858 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1859 | break; | |
1860 | } | |
1861 | if (rt) | |
d8d1f30b | 1862 | dst_hold(&rt->dst); |
c71099ac | 1863 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1864 | return rt; |
1865 | } | |
1866 | ||
b71d1d42 | 1867 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1868 | struct net_device *dev, |
1869 | unsigned int pref) | |
1da177e4 | 1870 | { |
86872cb5 TG |
1871 | struct fib6_config cfg = { |
1872 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1873 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1874 | .fc_ifindex = dev->ifindex, |
1875 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1876 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1877 | .fc_nlinfo.pid = 0, |
1878 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1879 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1880 | }; |
1da177e4 | 1881 | |
4e3fd7a0 | 1882 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1883 | |
86872cb5 | 1884 | ip6_route_add(&cfg); |
1da177e4 | 1885 | |
1da177e4 LT |
1886 | return rt6_get_dflt_router(gwaddr, dev); |
1887 | } | |
1888 | ||
7b4da532 | 1889 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1890 | { |
1891 | struct rt6_info *rt; | |
c71099ac TG |
1892 | struct fib6_table *table; |
1893 | ||
1894 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1895 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1896 | if (!table) |
c71099ac | 1897 | return; |
1da177e4 LT |
1898 | |
1899 | restart: | |
c71099ac | 1900 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1901 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1902 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1903 | dst_hold(&rt->dst); |
c71099ac | 1904 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1905 | ip6_del_rt(rt); |
1da177e4 LT |
1906 | goto restart; |
1907 | } | |
1908 | } | |
c71099ac | 1909 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1910 | } |
1911 | ||
5578689a DL |
1912 | static void rtmsg_to_fib6_config(struct net *net, |
1913 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1914 | struct fib6_config *cfg) |
1915 | { | |
1916 | memset(cfg, 0, sizeof(*cfg)); | |
1917 | ||
1918 | cfg->fc_table = RT6_TABLE_MAIN; | |
1919 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1920 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1921 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1922 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1923 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1924 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1925 | ||
5578689a | 1926 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1927 | |
4e3fd7a0 AD |
1928 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1929 | cfg->fc_src = rtmsg->rtmsg_src; | |
1930 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1931 | } |
1932 | ||
5578689a | 1933 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1934 | { |
86872cb5 | 1935 | struct fib6_config cfg; |
1da177e4 LT |
1936 | struct in6_rtmsg rtmsg; |
1937 | int err; | |
1938 | ||
1939 | switch(cmd) { | |
1940 | case SIOCADDRT: /* Add a route */ | |
1941 | case SIOCDELRT: /* Delete a route */ | |
1942 | if (!capable(CAP_NET_ADMIN)) | |
1943 | return -EPERM; | |
1944 | err = copy_from_user(&rtmsg, arg, | |
1945 | sizeof(struct in6_rtmsg)); | |
1946 | if (err) | |
1947 | return -EFAULT; | |
86872cb5 | 1948 | |
5578689a | 1949 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1950 | |
1da177e4 LT |
1951 | rtnl_lock(); |
1952 | switch (cmd) { | |
1953 | case SIOCADDRT: | |
86872cb5 | 1954 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1955 | break; |
1956 | case SIOCDELRT: | |
86872cb5 | 1957 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1958 | break; |
1959 | default: | |
1960 | err = -EINVAL; | |
1961 | } | |
1962 | rtnl_unlock(); | |
1963 | ||
1964 | return err; | |
3ff50b79 | 1965 | } |
1da177e4 LT |
1966 | |
1967 | return -EINVAL; | |
1968 | } | |
1969 | ||
1970 | /* | |
1971 | * Drop the packet on the floor | |
1972 | */ | |
1973 | ||
d5fdd6ba | 1974 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1975 | { |
612f09e8 | 1976 | int type; |
adf30907 | 1977 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1978 | switch (ipstats_mib_noroutes) { |
1979 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1980 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1981 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
1982 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1983 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1984 | break; |
1985 | } | |
1986 | /* FALLTHROUGH */ | |
1987 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1988 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1989 | ipstats_mib_noroutes); | |
612f09e8 YH |
1990 | break; |
1991 | } | |
3ffe533c | 1992 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
1993 | kfree_skb(skb); |
1994 | return 0; | |
1995 | } | |
1996 | ||
9ce8ade0 TG |
1997 | static int ip6_pkt_discard(struct sk_buff *skb) |
1998 | { | |
612f09e8 | 1999 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2000 | } |
2001 | ||
20380731 | 2002 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2003 | { |
adf30907 | 2004 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2005 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2006 | } |
2007 | ||
6723ab54 DM |
2008 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2009 | ||
9ce8ade0 TG |
2010 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2011 | { | |
612f09e8 | 2012 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2013 | } |
2014 | ||
2015 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2016 | { | |
adf30907 | 2017 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2018 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2019 | } |
2020 | ||
6723ab54 DM |
2021 | #endif |
2022 | ||
1da177e4 LT |
2023 | /* |
2024 | * Allocate a dst for local (unicast / anycast) address. | |
2025 | */ | |
2026 | ||
2027 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2028 | const struct in6_addr *addr, | |
8f031519 | 2029 | bool anycast) |
1da177e4 | 2030 | { |
c346dca1 | 2031 | struct net *net = dev_net(idev->dev); |
8b96d22d | 2032 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL); |
f83c7790 | 2033 | int err; |
1da177e4 | 2034 | |
38308473 | 2035 | if (!rt) { |
f3213831 | 2036 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
1da177e4 | 2037 | return ERR_PTR(-ENOMEM); |
40385653 | 2038 | } |
1da177e4 | 2039 | |
1da177e4 LT |
2040 | in6_dev_hold(idev); |
2041 | ||
11d53b49 | 2042 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2043 | rt->dst.input = ip6_input; |
2044 | rt->dst.output = ip6_output; | |
1da177e4 | 2045 | rt->rt6i_idev = idev; |
d8d1f30b | 2046 | rt->dst.obsolete = -1; |
1da177e4 LT |
2047 | |
2048 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2049 | if (anycast) |
2050 | rt->rt6i_flags |= RTF_ANYCAST; | |
2051 | else | |
1da177e4 | 2052 | rt->rt6i_flags |= RTF_LOCAL; |
8ade06c6 | 2053 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
f83c7790 | 2054 | if (err) { |
d8d1f30b | 2055 | dst_free(&rt->dst); |
f83c7790 | 2056 | return ERR_PTR(err); |
1da177e4 LT |
2057 | } |
2058 | ||
4e3fd7a0 | 2059 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2060 | rt->rt6i_dst.plen = 128; |
5578689a | 2061 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2062 | |
d8d1f30b | 2063 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2064 | |
2065 | return rt; | |
2066 | } | |
2067 | ||
c3968a85 DW |
2068 | int ip6_route_get_saddr(struct net *net, |
2069 | struct rt6_info *rt, | |
b71d1d42 | 2070 | const struct in6_addr *daddr, |
c3968a85 DW |
2071 | unsigned int prefs, |
2072 | struct in6_addr *saddr) | |
2073 | { | |
2074 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2075 | int err = 0; | |
2076 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2077 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2078 | else |
2079 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2080 | daddr, prefs, saddr); | |
2081 | return err; | |
2082 | } | |
2083 | ||
2084 | /* remove deleted ip from prefsrc entries */ | |
2085 | struct arg_dev_net_ip { | |
2086 | struct net_device *dev; | |
2087 | struct net *net; | |
2088 | struct in6_addr *addr; | |
2089 | }; | |
2090 | ||
2091 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2092 | { | |
2093 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2094 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2095 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2096 | ||
d1918542 | 2097 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2098 | rt != net->ipv6.ip6_null_entry && |
2099 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2100 | /* remove prefsrc entry */ | |
2101 | rt->rt6i_prefsrc.plen = 0; | |
2102 | } | |
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2107 | { | |
2108 | struct net *net = dev_net(ifp->idev->dev); | |
2109 | struct arg_dev_net_ip adni = { | |
2110 | .dev = ifp->idev->dev, | |
2111 | .net = net, | |
2112 | .addr = &ifp->addr, | |
2113 | }; | |
2114 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2115 | } | |
2116 | ||
8ed67789 DL |
2117 | struct arg_dev_net { |
2118 | struct net_device *dev; | |
2119 | struct net *net; | |
2120 | }; | |
2121 | ||
1da177e4 LT |
2122 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2123 | { | |
bc3ef660 | 2124 | const struct arg_dev_net *adn = arg; |
2125 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2126 | |
d1918542 | 2127 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2128 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2129 | return -1; |
c159d30c | 2130 | |
1da177e4 LT |
2131 | return 0; |
2132 | } | |
2133 | ||
f3db4851 | 2134 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2135 | { |
8ed67789 DL |
2136 | struct arg_dev_net adn = { |
2137 | .dev = dev, | |
2138 | .net = net, | |
2139 | }; | |
2140 | ||
2141 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2142 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2143 | } |
2144 | ||
95c96174 | 2145 | struct rt6_mtu_change_arg { |
1da177e4 | 2146 | struct net_device *dev; |
95c96174 | 2147 | unsigned int mtu; |
1da177e4 LT |
2148 | }; |
2149 | ||
2150 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2151 | { | |
2152 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2153 | struct inet6_dev *idev; | |
2154 | ||
2155 | /* In IPv6 pmtu discovery is not optional, | |
2156 | so that RTAX_MTU lock cannot disable it. | |
2157 | We still use this lock to block changes | |
2158 | caused by addrconf/ndisc. | |
2159 | */ | |
2160 | ||
2161 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2162 | if (!idev) |
1da177e4 LT |
2163 | return 0; |
2164 | ||
2165 | /* For administrative MTU increase, there is no way to discover | |
2166 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2167 | Since RFC 1981 doesn't include administrative MTU increase | |
2168 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2169 | */ | |
2170 | /* | |
2171 | If new MTU is less than route PMTU, this new MTU will be the | |
2172 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2173 | decreases; if new MTU is greater than route PMTU, and the | |
2174 | old MTU is the lowest MTU in the path, update the route PMTU | |
2175 | to reflect the increase. In this case if the other nodes' MTU | |
2176 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2177 | PMTU discouvery. | |
2178 | */ | |
d1918542 | 2179 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2180 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2181 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2182 | (dst_mtu(&rt->dst) < arg->mtu && | |
2183 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2184 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2185 | } |
1da177e4 LT |
2186 | return 0; |
2187 | } | |
2188 | ||
95c96174 | 2189 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2190 | { |
c71099ac TG |
2191 | struct rt6_mtu_change_arg arg = { |
2192 | .dev = dev, | |
2193 | .mtu = mtu, | |
2194 | }; | |
1da177e4 | 2195 | |
c346dca1 | 2196 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2197 | } |
2198 | ||
ef7c79ed | 2199 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2200 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2201 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2202 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2203 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2204 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2205 | }; | |
2206 | ||
2207 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2208 | struct fib6_config *cfg) | |
1da177e4 | 2209 | { |
86872cb5 TG |
2210 | struct rtmsg *rtm; |
2211 | struct nlattr *tb[RTA_MAX+1]; | |
2212 | int err; | |
1da177e4 | 2213 | |
86872cb5 TG |
2214 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2215 | if (err < 0) | |
2216 | goto errout; | |
1da177e4 | 2217 | |
86872cb5 TG |
2218 | err = -EINVAL; |
2219 | rtm = nlmsg_data(nlh); | |
2220 | memset(cfg, 0, sizeof(*cfg)); | |
2221 | ||
2222 | cfg->fc_table = rtm->rtm_table; | |
2223 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2224 | cfg->fc_src_len = rtm->rtm_src_len; | |
2225 | cfg->fc_flags = RTF_UP; | |
2226 | cfg->fc_protocol = rtm->rtm_protocol; | |
2227 | ||
2228 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2229 | cfg->fc_flags |= RTF_REJECT; | |
2230 | ||
ab79ad14 MŻ |
2231 | if (rtm->rtm_type == RTN_LOCAL) |
2232 | cfg->fc_flags |= RTF_LOCAL; | |
2233 | ||
86872cb5 TG |
2234 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2235 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2236 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2237 | |
2238 | if (tb[RTA_GATEWAY]) { | |
2239 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2240 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2241 | } |
86872cb5 TG |
2242 | |
2243 | if (tb[RTA_DST]) { | |
2244 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2245 | ||
2246 | if (nla_len(tb[RTA_DST]) < plen) | |
2247 | goto errout; | |
2248 | ||
2249 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2250 | } |
86872cb5 TG |
2251 | |
2252 | if (tb[RTA_SRC]) { | |
2253 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2254 | ||
2255 | if (nla_len(tb[RTA_SRC]) < plen) | |
2256 | goto errout; | |
2257 | ||
2258 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2259 | } |
86872cb5 | 2260 | |
c3968a85 DW |
2261 | if (tb[RTA_PREFSRC]) |
2262 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2263 | ||
86872cb5 TG |
2264 | if (tb[RTA_OIF]) |
2265 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2266 | ||
2267 | if (tb[RTA_PRIORITY]) | |
2268 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2269 | ||
2270 | if (tb[RTA_METRICS]) { | |
2271 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2272 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2273 | } |
86872cb5 TG |
2274 | |
2275 | if (tb[RTA_TABLE]) | |
2276 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2277 | ||
2278 | err = 0; | |
2279 | errout: | |
2280 | return err; | |
1da177e4 LT |
2281 | } |
2282 | ||
c127ea2c | 2283 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2284 | { |
86872cb5 TG |
2285 | struct fib6_config cfg; |
2286 | int err; | |
1da177e4 | 2287 | |
86872cb5 TG |
2288 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2289 | if (err < 0) | |
2290 | return err; | |
2291 | ||
2292 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2293 | } |
2294 | ||
c127ea2c | 2295 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2296 | { |
86872cb5 TG |
2297 | struct fib6_config cfg; |
2298 | int err; | |
1da177e4 | 2299 | |
86872cb5 TG |
2300 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2301 | if (err < 0) | |
2302 | return err; | |
2303 | ||
2304 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2305 | } |
2306 | ||
339bf98f TG |
2307 | static inline size_t rt6_nlmsg_size(void) |
2308 | { | |
2309 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2310 | + nla_total_size(16) /* RTA_SRC */ | |
2311 | + nla_total_size(16) /* RTA_DST */ | |
2312 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2313 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2314 | + nla_total_size(4) /* RTA_TABLE */ | |
2315 | + nla_total_size(4) /* RTA_IIF */ | |
2316 | + nla_total_size(4) /* RTA_OIF */ | |
2317 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2318 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2319 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2320 | } | |
2321 | ||
191cd582 BH |
2322 | static int rt6_fill_node(struct net *net, |
2323 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2324 | struct in6_addr *dst, struct in6_addr *src, |
2325 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2326 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 2327 | { |
346f870b | 2328 | const struct inet_peer *peer; |
1da177e4 | 2329 | struct rtmsg *rtm; |
2d7202bf | 2330 | struct nlmsghdr *nlh; |
e3703b3d | 2331 | long expires; |
9e762a4a | 2332 | u32 table; |
f2c31e32 | 2333 | struct neighbour *n; |
346f870b | 2334 | u32 ts, tsage; |
1da177e4 LT |
2335 | |
2336 | if (prefix) { /* user wants prefix routes only */ | |
2337 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2338 | /* success since this is not a prefix route */ | |
2339 | return 1; | |
2340 | } | |
2341 | } | |
2342 | ||
2d7202bf | 2343 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
38308473 | 2344 | if (!nlh) |
26932566 | 2345 | return -EMSGSIZE; |
2d7202bf TG |
2346 | |
2347 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2348 | rtm->rtm_family = AF_INET6; |
2349 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2350 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2351 | rtm->rtm_tos = 0; | |
c71099ac | 2352 | if (rt->rt6i_table) |
9e762a4a | 2353 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2354 | else |
9e762a4a PM |
2355 | table = RT6_TABLE_UNSPEC; |
2356 | rtm->rtm_table = table; | |
c78679e8 DM |
2357 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2358 | goto nla_put_failure; | |
38308473 | 2359 | if (rt->rt6i_flags & RTF_REJECT) |
1da177e4 | 2360 | rtm->rtm_type = RTN_UNREACHABLE; |
38308473 | 2361 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2362 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2363 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2364 | rtm->rtm_type = RTN_LOCAL; |
2365 | else | |
2366 | rtm->rtm_type = RTN_UNICAST; | |
2367 | rtm->rtm_flags = 0; | |
2368 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2369 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2370 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 LT |
2371 | rtm->rtm_protocol = RTPROT_REDIRECT; |
2372 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2373 | rtm->rtm_protocol = RTPROT_KERNEL; | |
38308473 | 2374 | else if (rt->rt6i_flags & RTF_DEFAULT) |
1da177e4 LT |
2375 | rtm->rtm_protocol = RTPROT_RA; |
2376 | ||
38308473 | 2377 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2378 | rtm->rtm_flags |= RTM_F_CLONED; |
2379 | ||
2380 | if (dst) { | |
c78679e8 DM |
2381 | if (nla_put(skb, RTA_DST, 16, dst)) |
2382 | goto nla_put_failure; | |
1ab1457c | 2383 | rtm->rtm_dst_len = 128; |
1da177e4 | 2384 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2385 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2386 | goto nla_put_failure; | |
1da177e4 LT |
2387 | #ifdef CONFIG_IPV6_SUBTREES |
2388 | if (src) { | |
c78679e8 DM |
2389 | if (nla_put(skb, RTA_SRC, 16, src)) |
2390 | goto nla_put_failure; | |
1ab1457c | 2391 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2392 | } else if (rtm->rtm_src_len && |
2393 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2394 | goto nla_put_failure; | |
1da177e4 | 2395 | #endif |
7bc570c8 YH |
2396 | if (iif) { |
2397 | #ifdef CONFIG_IPV6_MROUTE | |
2398 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2399 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2400 | if (err <= 0) { |
2401 | if (!nowait) { | |
2402 | if (err == 0) | |
2403 | return 0; | |
2404 | goto nla_put_failure; | |
2405 | } else { | |
2406 | if (err == -EMSGSIZE) | |
2407 | goto nla_put_failure; | |
2408 | } | |
2409 | } | |
2410 | } else | |
2411 | #endif | |
c78679e8 DM |
2412 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2413 | goto nla_put_failure; | |
7bc570c8 | 2414 | } else if (dst) { |
1da177e4 | 2415 | struct in6_addr saddr_buf; |
c78679e8 DM |
2416 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2417 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2418 | goto nla_put_failure; | |
1da177e4 | 2419 | } |
2d7202bf | 2420 | |
c3968a85 DW |
2421 | if (rt->rt6i_prefsrc.plen) { |
2422 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2423 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2424 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2425 | goto nla_put_failure; | |
c3968a85 DW |
2426 | } |
2427 | ||
defb3519 | 2428 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2429 | goto nla_put_failure; |
2430 | ||
f2c31e32 | 2431 | rcu_read_lock(); |
27217455 | 2432 | n = dst_get_neighbour_noref(&rt->dst); |
94f826b8 ED |
2433 | if (n) { |
2434 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) { | |
2435 | rcu_read_unlock(); | |
2436 | goto nla_put_failure; | |
2437 | } | |
2438 | } | |
f2c31e32 | 2439 | rcu_read_unlock(); |
2d7202bf | 2440 | |
c78679e8 DM |
2441 | if (rt->dst.dev && |
2442 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2443 | goto nla_put_failure; | |
2444 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2445 | goto nla_put_failure; | |
36e3deae YH |
2446 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2447 | expires = 0; | |
d1918542 DM |
2448 | else if (rt->dst.expires - jiffies < INT_MAX) |
2449 | expires = rt->dst.expires - jiffies; | |
36e3deae YH |
2450 | else |
2451 | expires = INT_MAX; | |
69cdf8f9 | 2452 | |
97bab73f DM |
2453 | peer = NULL; |
2454 | if (rt6_has_peer(rt)) | |
2455 | peer = rt6_peer_ptr(rt); | |
346f870b DM |
2456 | ts = tsage = 0; |
2457 | if (peer && peer->tcp_ts_stamp) { | |
2458 | ts = peer->tcp_ts; | |
2459 | tsage = get_seconds() - peer->tcp_ts_stamp; | |
2460 | } | |
2461 | ||
2462 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage, | |
d8d1f30b | 2463 | expires, rt->dst.error) < 0) |
e3703b3d | 2464 | goto nla_put_failure; |
2d7202bf TG |
2465 | |
2466 | return nlmsg_end(skb, nlh); | |
2467 | ||
2468 | nla_put_failure: | |
26932566 PM |
2469 | nlmsg_cancel(skb, nlh); |
2470 | return -EMSGSIZE; | |
1da177e4 LT |
2471 | } |
2472 | ||
1b43af54 | 2473 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2474 | { |
2475 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2476 | int prefix; | |
2477 | ||
2d7202bf TG |
2478 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2479 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2480 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2481 | } else | |
2482 | prefix = 0; | |
2483 | ||
191cd582 BH |
2484 | return rt6_fill_node(arg->net, |
2485 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2486 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2487 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2488 | } |
2489 | ||
c127ea2c | 2490 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2491 | { |
3b1e0a65 | 2492 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2493 | struct nlattr *tb[RTA_MAX+1]; |
2494 | struct rt6_info *rt; | |
1da177e4 | 2495 | struct sk_buff *skb; |
ab364a6f | 2496 | struct rtmsg *rtm; |
4c9483b2 | 2497 | struct flowi6 fl6; |
72331bc0 | 2498 | int err, iif = 0, oif = 0; |
1da177e4 | 2499 | |
ab364a6f TG |
2500 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2501 | if (err < 0) | |
2502 | goto errout; | |
1da177e4 | 2503 | |
ab364a6f | 2504 | err = -EINVAL; |
4c9483b2 | 2505 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2506 | |
ab364a6f TG |
2507 | if (tb[RTA_SRC]) { |
2508 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2509 | goto errout; | |
2510 | ||
4e3fd7a0 | 2511 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2512 | } |
2513 | ||
2514 | if (tb[RTA_DST]) { | |
2515 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2516 | goto errout; | |
2517 | ||
4e3fd7a0 | 2518 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2519 | } |
2520 | ||
2521 | if (tb[RTA_IIF]) | |
2522 | iif = nla_get_u32(tb[RTA_IIF]); | |
2523 | ||
2524 | if (tb[RTA_OIF]) | |
72331bc0 | 2525 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2526 | |
2527 | if (iif) { | |
2528 | struct net_device *dev; | |
72331bc0 SL |
2529 | int flags = 0; |
2530 | ||
5578689a | 2531 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2532 | if (!dev) { |
2533 | err = -ENODEV; | |
ab364a6f | 2534 | goto errout; |
1da177e4 | 2535 | } |
72331bc0 SL |
2536 | |
2537 | fl6.flowi6_iif = iif; | |
2538 | ||
2539 | if (!ipv6_addr_any(&fl6.saddr)) | |
2540 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2541 | ||
2542 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2543 | flags); | |
2544 | } else { | |
2545 | fl6.flowi6_oif = oif; | |
2546 | ||
2547 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2548 | } |
2549 | ||
ab364a6f | 2550 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2551 | if (!skb) { |
2173bff5 | 2552 | dst_release(&rt->dst); |
ab364a6f TG |
2553 | err = -ENOBUFS; |
2554 | goto errout; | |
2555 | } | |
1da177e4 | 2556 | |
ab364a6f TG |
2557 | /* Reserve room for dummy headers, this skb can pass |
2558 | through good chunk of routing engine. | |
2559 | */ | |
459a98ed | 2560 | skb_reset_mac_header(skb); |
ab364a6f | 2561 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2562 | |
d8d1f30b | 2563 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2564 | |
4c9483b2 | 2565 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2566 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2567 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2568 | if (err < 0) { |
ab364a6f TG |
2569 | kfree_skb(skb); |
2570 | goto errout; | |
1da177e4 LT |
2571 | } |
2572 | ||
5578689a | 2573 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2574 | errout: |
1da177e4 | 2575 | return err; |
1da177e4 LT |
2576 | } |
2577 | ||
86872cb5 | 2578 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2579 | { |
2580 | struct sk_buff *skb; | |
5578689a | 2581 | struct net *net = info->nl_net; |
528c4ceb DL |
2582 | u32 seq; |
2583 | int err; | |
2584 | ||
2585 | err = -ENOBUFS; | |
38308473 | 2586 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2587 | |
339bf98f | 2588 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2589 | if (!skb) |
21713ebc TG |
2590 | goto errout; |
2591 | ||
191cd582 | 2592 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2593 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2594 | if (err < 0) { |
2595 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2596 | WARN_ON(err == -EMSGSIZE); | |
2597 | kfree_skb(skb); | |
2598 | goto errout; | |
2599 | } | |
1ce85fe4 PNA |
2600 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2601 | info->nlh, gfp_any()); | |
2602 | return; | |
21713ebc TG |
2603 | errout: |
2604 | if (err < 0) | |
5578689a | 2605 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2606 | } |
2607 | ||
8ed67789 DL |
2608 | static int ip6_route_dev_notify(struct notifier_block *this, |
2609 | unsigned long event, void *data) | |
2610 | { | |
2611 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2612 | struct net *net = dev_net(dev); |
8ed67789 DL |
2613 | |
2614 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2615 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2616 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2617 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2618 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2619 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2620 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2621 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2622 | #endif | |
2623 | } | |
2624 | ||
2625 | return NOTIFY_OK; | |
2626 | } | |
2627 | ||
1da177e4 LT |
2628 | /* |
2629 | * /proc | |
2630 | */ | |
2631 | ||
2632 | #ifdef CONFIG_PROC_FS | |
2633 | ||
1da177e4 LT |
2634 | struct rt6_proc_arg |
2635 | { | |
2636 | char *buffer; | |
2637 | int offset; | |
2638 | int length; | |
2639 | int skip; | |
2640 | int len; | |
2641 | }; | |
2642 | ||
2643 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2644 | { | |
33120b30 | 2645 | struct seq_file *m = p_arg; |
69cce1d1 | 2646 | struct neighbour *n; |
1da177e4 | 2647 | |
4b7a4274 | 2648 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2649 | |
2650 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2651 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2652 | #else |
33120b30 | 2653 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2654 | #endif |
f2c31e32 | 2655 | rcu_read_lock(); |
27217455 | 2656 | n = dst_get_neighbour_noref(&rt->dst); |
69cce1d1 DM |
2657 | if (n) { |
2658 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2659 | } else { |
33120b30 | 2660 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2661 | } |
f2c31e32 | 2662 | rcu_read_unlock(); |
33120b30 | 2663 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2664 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2665 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2666 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2667 | return 0; |
2668 | } | |
2669 | ||
33120b30 | 2670 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2671 | { |
f3db4851 | 2672 | struct net *net = (struct net *)m->private; |
32b293a5 | 2673 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2674 | return 0; |
2675 | } | |
1da177e4 | 2676 | |
33120b30 AD |
2677 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2678 | { | |
de05c557 | 2679 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2680 | } |
2681 | ||
33120b30 AD |
2682 | static const struct file_operations ipv6_route_proc_fops = { |
2683 | .owner = THIS_MODULE, | |
2684 | .open = ipv6_route_open, | |
2685 | .read = seq_read, | |
2686 | .llseek = seq_lseek, | |
b6fcbdb4 | 2687 | .release = single_release_net, |
33120b30 AD |
2688 | }; |
2689 | ||
1da177e4 LT |
2690 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2691 | { | |
69ddb805 | 2692 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2693 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2694 | net->ipv6.rt6_stats->fib_nodes, |
2695 | net->ipv6.rt6_stats->fib_route_nodes, | |
2696 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2697 | net->ipv6.rt6_stats->fib_rt_entries, | |
2698 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2699 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2700 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2701 | |
2702 | return 0; | |
2703 | } | |
2704 | ||
2705 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2706 | { | |
de05c557 | 2707 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2708 | } |
2709 | ||
9a32144e | 2710 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2711 | .owner = THIS_MODULE, |
2712 | .open = rt6_stats_seq_open, | |
2713 | .read = seq_read, | |
2714 | .llseek = seq_lseek, | |
b6fcbdb4 | 2715 | .release = single_release_net, |
1da177e4 LT |
2716 | }; |
2717 | #endif /* CONFIG_PROC_FS */ | |
2718 | ||
2719 | #ifdef CONFIG_SYSCTL | |
2720 | ||
1da177e4 | 2721 | static |
8d65af78 | 2722 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2723 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2724 | { | |
c486da34 LAG |
2725 | struct net *net; |
2726 | int delay; | |
2727 | if (!write) | |
1da177e4 | 2728 | return -EINVAL; |
c486da34 LAG |
2729 | |
2730 | net = (struct net *)ctl->extra1; | |
2731 | delay = net->ipv6.sysctl.flush_delay; | |
2732 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2733 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2734 | return 0; | |
1da177e4 LT |
2735 | } |
2736 | ||
760f2d01 | 2737 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2738 | { |
1da177e4 | 2739 | .procname = "flush", |
4990509f | 2740 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2741 | .maxlen = sizeof(int), |
89c8b3a1 | 2742 | .mode = 0200, |
6d9f239a | 2743 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2744 | }, |
2745 | { | |
1da177e4 | 2746 | .procname = "gc_thresh", |
9a7ec3a9 | 2747 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2748 | .maxlen = sizeof(int), |
2749 | .mode = 0644, | |
6d9f239a | 2750 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2751 | }, |
2752 | { | |
1da177e4 | 2753 | .procname = "max_size", |
4990509f | 2754 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2755 | .maxlen = sizeof(int), |
2756 | .mode = 0644, | |
6d9f239a | 2757 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2758 | }, |
2759 | { | |
1da177e4 | 2760 | .procname = "gc_min_interval", |
4990509f | 2761 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2762 | .maxlen = sizeof(int), |
2763 | .mode = 0644, | |
6d9f239a | 2764 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2765 | }, |
2766 | { | |
1da177e4 | 2767 | .procname = "gc_timeout", |
4990509f | 2768 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2769 | .maxlen = sizeof(int), |
2770 | .mode = 0644, | |
6d9f239a | 2771 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2772 | }, |
2773 | { | |
1da177e4 | 2774 | .procname = "gc_interval", |
4990509f | 2775 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2776 | .maxlen = sizeof(int), |
2777 | .mode = 0644, | |
6d9f239a | 2778 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2779 | }, |
2780 | { | |
1da177e4 | 2781 | .procname = "gc_elasticity", |
4990509f | 2782 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2783 | .maxlen = sizeof(int), |
2784 | .mode = 0644, | |
f3d3f616 | 2785 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2786 | }, |
2787 | { | |
1da177e4 | 2788 | .procname = "mtu_expires", |
4990509f | 2789 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2790 | .maxlen = sizeof(int), |
2791 | .mode = 0644, | |
6d9f239a | 2792 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2793 | }, |
2794 | { | |
1da177e4 | 2795 | .procname = "min_adv_mss", |
4990509f | 2796 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2797 | .maxlen = sizeof(int), |
2798 | .mode = 0644, | |
f3d3f616 | 2799 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2800 | }, |
2801 | { | |
1da177e4 | 2802 | .procname = "gc_min_interval_ms", |
4990509f | 2803 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2804 | .maxlen = sizeof(int), |
2805 | .mode = 0644, | |
6d9f239a | 2806 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2807 | }, |
f8572d8f | 2808 | { } |
1da177e4 LT |
2809 | }; |
2810 | ||
2c8c1e72 | 2811 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2812 | { |
2813 | struct ctl_table *table; | |
2814 | ||
2815 | table = kmemdup(ipv6_route_table_template, | |
2816 | sizeof(ipv6_route_table_template), | |
2817 | GFP_KERNEL); | |
5ee09105 YH |
2818 | |
2819 | if (table) { | |
2820 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2821 | table[0].extra1 = net; |
86393e52 | 2822 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2823 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2824 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2825 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2826 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2827 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2828 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2829 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2830 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2831 | } |
2832 | ||
760f2d01 DL |
2833 | return table; |
2834 | } | |
1da177e4 LT |
2835 | #endif |
2836 | ||
2c8c1e72 | 2837 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2838 | { |
633d424b | 2839 | int ret = -ENOMEM; |
8ed67789 | 2840 | |
86393e52 AD |
2841 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2842 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2843 | |
fc66f95c ED |
2844 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2845 | goto out_ip6_dst_ops; | |
2846 | ||
8ed67789 DL |
2847 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2848 | sizeof(*net->ipv6.ip6_null_entry), | |
2849 | GFP_KERNEL); | |
2850 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2851 | goto out_ip6_dst_entries; |
d8d1f30b | 2852 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2853 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2854 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2855 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2856 | ip6_template_metrics, true); | |
8ed67789 DL |
2857 | |
2858 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2859 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2860 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2861 | GFP_KERNEL); | |
68fffc67 PZ |
2862 | if (!net->ipv6.ip6_prohibit_entry) |
2863 | goto out_ip6_null_entry; | |
d8d1f30b | 2864 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2865 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2866 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2867 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2868 | ip6_template_metrics, true); | |
8ed67789 DL |
2869 | |
2870 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2871 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2872 | GFP_KERNEL); | |
68fffc67 PZ |
2873 | if (!net->ipv6.ip6_blk_hole_entry) |
2874 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2875 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2876 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2877 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2878 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2879 | ip6_template_metrics, true); | |
8ed67789 DL |
2880 | #endif |
2881 | ||
b339a47c PZ |
2882 | net->ipv6.sysctl.flush_delay = 0; |
2883 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2884 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2885 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2886 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2887 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2888 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2889 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2890 | ||
cdb18761 DL |
2891 | #ifdef CONFIG_PROC_FS |
2892 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2893 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2894 | #endif | |
6891a346 BT |
2895 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2896 | ||
8ed67789 DL |
2897 | ret = 0; |
2898 | out: | |
2899 | return ret; | |
f2fc6a54 | 2900 | |
68fffc67 PZ |
2901 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2902 | out_ip6_prohibit_entry: | |
2903 | kfree(net->ipv6.ip6_prohibit_entry); | |
2904 | out_ip6_null_entry: | |
2905 | kfree(net->ipv6.ip6_null_entry); | |
2906 | #endif | |
fc66f95c ED |
2907 | out_ip6_dst_entries: |
2908 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2909 | out_ip6_dst_ops: |
f2fc6a54 | 2910 | goto out; |
cdb18761 DL |
2911 | } |
2912 | ||
2c8c1e72 | 2913 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2914 | { |
2915 | #ifdef CONFIG_PROC_FS | |
2916 | proc_net_remove(net, "ipv6_route"); | |
2917 | proc_net_remove(net, "rt6_stats"); | |
2918 | #endif | |
8ed67789 DL |
2919 | kfree(net->ipv6.ip6_null_entry); |
2920 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2921 | kfree(net->ipv6.ip6_prohibit_entry); | |
2922 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2923 | #endif | |
41bb78b4 | 2924 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2925 | } |
2926 | ||
2927 | static struct pernet_operations ip6_route_net_ops = { | |
2928 | .init = ip6_route_net_init, | |
2929 | .exit = ip6_route_net_exit, | |
2930 | }; | |
2931 | ||
c3426b47 DM |
2932 | static int __net_init ipv6_inetpeer_init(struct net *net) |
2933 | { | |
2934 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
2935 | ||
2936 | if (!bp) | |
2937 | return -ENOMEM; | |
2938 | inet_peer_base_init(bp); | |
2939 | net->ipv6.peers = bp; | |
2940 | return 0; | |
2941 | } | |
2942 | ||
2943 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
2944 | { | |
2945 | struct inet_peer_base *bp = net->ipv6.peers; | |
2946 | ||
2947 | net->ipv6.peers = NULL; | |
56a6b248 | 2948 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
2949 | kfree(bp); |
2950 | } | |
2951 | ||
2b823f72 | 2952 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
2953 | .init = ipv6_inetpeer_init, |
2954 | .exit = ipv6_inetpeer_exit, | |
2955 | }; | |
2956 | ||
8ed67789 DL |
2957 | static struct notifier_block ip6_route_dev_notifier = { |
2958 | .notifier_call = ip6_route_dev_notify, | |
2959 | .priority = 0, | |
2960 | }; | |
2961 | ||
433d49c3 | 2962 | int __init ip6_route_init(void) |
1da177e4 | 2963 | { |
433d49c3 DL |
2964 | int ret; |
2965 | ||
9a7ec3a9 DL |
2966 | ret = -ENOMEM; |
2967 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2968 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2969 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2970 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2971 | goto out; |
14e50e57 | 2972 | |
fc66f95c | 2973 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2974 | if (ret) |
bdb3289f | 2975 | goto out_kmem_cache; |
bdb3289f | 2976 | |
2a0c451a | 2977 | ret = fib6_init(); |
fc66f95c ED |
2978 | if (ret) |
2979 | goto out_dst_entries; | |
2980 | ||
c3426b47 DM |
2981 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
2982 | if (ret) | |
2a0c451a TG |
2983 | goto out_fib6_init; |
2984 | ||
7e52b33b DM |
2985 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2986 | if (ret) | |
2987 | goto out_register_inetpeer; | |
c3426b47 | 2988 | |
5dc121e9 AE |
2989 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2990 | ||
8ed67789 DL |
2991 | /* Registering of the loopback is done before this portion of code, |
2992 | * the loopback reference in rt6_info will not be taken, do it | |
2993 | * manually for init_net */ | |
d8d1f30b | 2994 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2995 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2996 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2997 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2998 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2999 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3000 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3001 | #endif | |
2a0c451a | 3002 | ret = fib6_init_late(); |
433d49c3 | 3003 | if (ret) |
8ed67789 | 3004 | goto out_register_subsys; |
433d49c3 | 3005 | |
433d49c3 DL |
3006 | ret = xfrm6_init(); |
3007 | if (ret) | |
2a0c451a | 3008 | goto out_fib6_init_late; |
c35b7e72 | 3009 | |
433d49c3 DL |
3010 | ret = fib6_rules_init(); |
3011 | if (ret) | |
3012 | goto xfrm6_init; | |
7e5449c2 | 3013 | |
433d49c3 | 3014 | ret = -ENOBUFS; |
c7ac8679 GR |
3015 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3016 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3017 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
433d49c3 | 3018 | goto fib6_rules_init; |
c127ea2c | 3019 | |
8ed67789 | 3020 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
3021 | if (ret) |
3022 | goto fib6_rules_init; | |
8ed67789 | 3023 | |
433d49c3 DL |
3024 | out: |
3025 | return ret; | |
3026 | ||
3027 | fib6_rules_init: | |
433d49c3 DL |
3028 | fib6_rules_cleanup(); |
3029 | xfrm6_init: | |
433d49c3 | 3030 | xfrm6_fini(); |
2a0c451a TG |
3031 | out_fib6_init_late: |
3032 | fib6_cleanup_late(); | |
8ed67789 DL |
3033 | out_register_subsys: |
3034 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3035 | out_register_inetpeer: |
3036 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
2a0c451a TG |
3037 | out_fib6_init: |
3038 | fib6_gc_cleanup(); | |
fc66f95c ED |
3039 | out_dst_entries: |
3040 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3041 | out_kmem_cache: |
f2fc6a54 | 3042 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3043 | goto out; |
1da177e4 LT |
3044 | } |
3045 | ||
3046 | void ip6_route_cleanup(void) | |
3047 | { | |
8ed67789 | 3048 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 3049 | fib6_rules_cleanup(); |
1da177e4 | 3050 | xfrm6_fini(); |
1da177e4 | 3051 | fib6_gc_cleanup(); |
c3426b47 | 3052 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3053 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3054 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3055 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3056 | } |