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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
7bc570c8 | 37 | #include <linux/mroute6.h> |
1da177e4 | 38 | #include <linux/init.h> |
1da177e4 | 39 | #include <linux/if_arp.h> |
1da177e4 LT |
40 | #include <linux/proc_fs.h> |
41 | #include <linux/seq_file.h> | |
5b7c931d | 42 | #include <linux/nsproxy.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
1da177e4 LT |
75 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
76 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 77 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
d33e4553 | 78 | static unsigned int ip6_default_mtu(const struct dst_entry *dst); |
1da177e4 LT |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
89 | ||
70ceb4f5 | 90 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 91 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
92 | const struct in6_addr *prefix, int prefixlen, |
93 | const struct in6_addr *gwaddr, int ifindex, | |
70ceb4f5 | 94 | unsigned pref); |
efa2cea0 | 95 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
96 | const struct in6_addr *prefix, int prefixlen, |
97 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
98 | #endif |
99 | ||
06582540 DM |
100 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
101 | { | |
102 | struct rt6_info *rt = (struct rt6_info *) dst; | |
103 | struct inet_peer *peer; | |
104 | u32 *p = NULL; | |
105 | ||
106 | if (!rt->rt6i_peer) | |
107 | rt6_bind_peer(rt, 1); | |
108 | ||
109 | peer = rt->rt6i_peer; | |
110 | if (peer) { | |
111 | u32 *old_p = __DST_METRICS_PTR(old); | |
112 | unsigned long prev, new; | |
113 | ||
114 | p = peer->metrics; | |
115 | if (inet_metrics_new(peer)) | |
116 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
117 | ||
118 | new = (unsigned long) p; | |
119 | prev = cmpxchg(&dst->_metrics, old, new); | |
120 | ||
121 | if (prev != old) { | |
122 | p = __DST_METRICS_PTR(prev); | |
123 | if (prev & DST_METRICS_READ_ONLY) | |
124 | p = NULL; | |
125 | } | |
126 | } | |
127 | return p; | |
128 | } | |
129 | ||
9a7ec3a9 | 130 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 131 | .family = AF_INET6, |
09640e63 | 132 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
133 | .gc = ip6_dst_gc, |
134 | .gc_thresh = 1024, | |
135 | .check = ip6_dst_check, | |
0dbaee3b | 136 | .default_advmss = ip6_default_advmss, |
d33e4553 | 137 | .default_mtu = ip6_default_mtu, |
06582540 | 138 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
139 | .destroy = ip6_dst_destroy, |
140 | .ifdown = ip6_dst_ifdown, | |
141 | .negative_advice = ip6_negative_advice, | |
142 | .link_failure = ip6_link_failure, | |
143 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 144 | .local_out = __ip6_local_out, |
1da177e4 LT |
145 | }; |
146 | ||
ec831ea7 RD |
147 | static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst) |
148 | { | |
149 | return 0; | |
150 | } | |
151 | ||
14e50e57 DM |
152 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
153 | { | |
154 | } | |
155 | ||
0972ddb2 HB |
156 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
157 | unsigned long old) | |
158 | { | |
159 | return NULL; | |
160 | } | |
161 | ||
14e50e57 DM |
162 | static struct dst_ops ip6_dst_blackhole_ops = { |
163 | .family = AF_INET6, | |
09640e63 | 164 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
165 | .destroy = ip6_dst_destroy, |
166 | .check = ip6_dst_check, | |
ec831ea7 | 167 | .default_mtu = ip6_blackhole_default_mtu, |
214f45c9 | 168 | .default_advmss = ip6_default_advmss, |
14e50e57 | 169 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 170 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
14e50e57 DM |
171 | }; |
172 | ||
62fa8a84 DM |
173 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
174 | [RTAX_HOPLIMIT - 1] = 255, | |
175 | }; | |
176 | ||
bdb3289f | 177 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
178 | .dst = { |
179 | .__refcnt = ATOMIC_INIT(1), | |
180 | .__use = 1, | |
181 | .obsolete = -1, | |
182 | .error = -ENETUNREACH, | |
d8d1f30b CG |
183 | .input = ip6_pkt_discard, |
184 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
185 | }, |
186 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 187 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
188 | .rt6i_metric = ~(u32) 0, |
189 | .rt6i_ref = ATOMIC_INIT(1), | |
190 | }; | |
191 | ||
101367c2 TG |
192 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
193 | ||
6723ab54 DM |
194 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
195 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 196 | |
280a34c8 | 197 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
198 | .dst = { |
199 | .__refcnt = ATOMIC_INIT(1), | |
200 | .__use = 1, | |
201 | .obsolete = -1, | |
202 | .error = -EACCES, | |
d8d1f30b CG |
203 | .input = ip6_pkt_prohibit, |
204 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
205 | }, |
206 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 207 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
208 | .rt6i_metric = ~(u32) 0, |
209 | .rt6i_ref = ATOMIC_INIT(1), | |
210 | }; | |
211 | ||
bdb3289f | 212 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
213 | .dst = { |
214 | .__refcnt = ATOMIC_INIT(1), | |
215 | .__use = 1, | |
216 | .obsolete = -1, | |
217 | .error = -EINVAL, | |
d8d1f30b CG |
218 | .input = dst_discard, |
219 | .output = dst_discard, | |
101367c2 TG |
220 | }, |
221 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 222 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
223 | .rt6i_metric = ~(u32) 0, |
224 | .rt6i_ref = ATOMIC_INIT(1), | |
225 | }; | |
226 | ||
227 | #endif | |
228 | ||
1da177e4 | 229 | /* allocate dst with ip6_dst_ops */ |
5c1e6aa3 DM |
230 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops, |
231 | struct net_device *dev) | |
1da177e4 | 232 | { |
cf911662 DM |
233 | struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, 0); |
234 | ||
235 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); | |
236 | ||
237 | return rt; | |
1da177e4 LT |
238 | } |
239 | ||
240 | static void ip6_dst_destroy(struct dst_entry *dst) | |
241 | { | |
242 | struct rt6_info *rt = (struct rt6_info *)dst; | |
243 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 244 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 LT |
245 | |
246 | if (idev != NULL) { | |
247 | rt->rt6i_idev = NULL; | |
248 | in6_dev_put(idev); | |
1ab1457c | 249 | } |
b3419363 | 250 | if (peer) { |
b3419363 DM |
251 | rt->rt6i_peer = NULL; |
252 | inet_putpeer(peer); | |
253 | } | |
254 | } | |
255 | ||
6431cbc2 DM |
256 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
257 | ||
258 | static u32 rt6_peer_genid(void) | |
259 | { | |
260 | return atomic_read(&__rt6_peer_genid); | |
261 | } | |
262 | ||
b3419363 DM |
263 | void rt6_bind_peer(struct rt6_info *rt, int create) |
264 | { | |
265 | struct inet_peer *peer; | |
266 | ||
b3419363 DM |
267 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
268 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
269 | inet_putpeer(peer); | |
6431cbc2 DM |
270 | else |
271 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1da177e4 LT |
272 | } |
273 | ||
274 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
275 | int how) | |
276 | { | |
277 | struct rt6_info *rt = (struct rt6_info *)dst; | |
278 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 279 | struct net_device *loopback_dev = |
c346dca1 | 280 | dev_net(dev)->loopback_dev; |
1da177e4 | 281 | |
5a3e55d6 DL |
282 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
283 | struct inet6_dev *loopback_idev = | |
284 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
285 | if (loopback_idev != NULL) { |
286 | rt->rt6i_idev = loopback_idev; | |
287 | in6_dev_put(idev); | |
288 | } | |
289 | } | |
290 | } | |
291 | ||
292 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
293 | { | |
a02cec21 ED |
294 | return (rt->rt6i_flags & RTF_EXPIRES) && |
295 | time_after(jiffies, rt->rt6i_expires); | |
1da177e4 LT |
296 | } |
297 | ||
b71d1d42 | 298 | static inline int rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 299 | { |
a02cec21 ED |
300 | return ipv6_addr_type(daddr) & |
301 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
302 | } |
303 | ||
1da177e4 | 304 | /* |
c71099ac | 305 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
306 | */ |
307 | ||
8ed67789 DL |
308 | static inline struct rt6_info *rt6_device_match(struct net *net, |
309 | struct rt6_info *rt, | |
b71d1d42 | 310 | const struct in6_addr *saddr, |
1da177e4 | 311 | int oif, |
d420895e | 312 | int flags) |
1da177e4 LT |
313 | { |
314 | struct rt6_info *local = NULL; | |
315 | struct rt6_info *sprt; | |
316 | ||
dd3abc4e YH |
317 | if (!oif && ipv6_addr_any(saddr)) |
318 | goto out; | |
319 | ||
d8d1f30b | 320 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
dd3abc4e YH |
321 | struct net_device *dev = sprt->rt6i_dev; |
322 | ||
323 | if (oif) { | |
1da177e4 LT |
324 | if (dev->ifindex == oif) |
325 | return sprt; | |
326 | if (dev->flags & IFF_LOOPBACK) { | |
327 | if (sprt->rt6i_idev == NULL || | |
328 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 329 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 330 | continue; |
1ab1457c | 331 | if (local && (!oif || |
1da177e4 LT |
332 | local->rt6i_idev->dev->ifindex == oif)) |
333 | continue; | |
334 | } | |
335 | local = sprt; | |
336 | } | |
dd3abc4e YH |
337 | } else { |
338 | if (ipv6_chk_addr(net, saddr, dev, | |
339 | flags & RT6_LOOKUP_F_IFACE)) | |
340 | return sprt; | |
1da177e4 | 341 | } |
dd3abc4e | 342 | } |
1da177e4 | 343 | |
dd3abc4e | 344 | if (oif) { |
1da177e4 LT |
345 | if (local) |
346 | return local; | |
347 | ||
d420895e | 348 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 349 | return net->ipv6.ip6_null_entry; |
1da177e4 | 350 | } |
dd3abc4e | 351 | out: |
1da177e4 LT |
352 | return rt; |
353 | } | |
354 | ||
27097255 YH |
355 | #ifdef CONFIG_IPV6_ROUTER_PREF |
356 | static void rt6_probe(struct rt6_info *rt) | |
357 | { | |
358 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
359 | /* | |
360 | * Okay, this does not seem to be appropriate | |
361 | * for now, however, we need to check if it | |
362 | * is really so; aka Router Reachability Probing. | |
363 | * | |
364 | * Router Reachability Probe MUST be rate-limited | |
365 | * to no more than one per minute. | |
366 | */ | |
367 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
368 | return; | |
369 | read_lock_bh(&neigh->lock); | |
370 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 371 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
372 | struct in6_addr mcaddr; |
373 | struct in6_addr *target; | |
374 | ||
375 | neigh->updated = jiffies; | |
376 | read_unlock_bh(&neigh->lock); | |
377 | ||
378 | target = (struct in6_addr *)&neigh->primary_key; | |
379 | addrconf_addr_solict_mult(target, &mcaddr); | |
380 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
381 | } else | |
382 | read_unlock_bh(&neigh->lock); | |
383 | } | |
384 | #else | |
385 | static inline void rt6_probe(struct rt6_info *rt) | |
386 | { | |
27097255 YH |
387 | } |
388 | #endif | |
389 | ||
1da177e4 | 390 | /* |
554cfb7e | 391 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 392 | */ |
b6f99a21 | 393 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
394 | { |
395 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 396 | if (!oif || dev->ifindex == oif) |
554cfb7e | 397 | return 2; |
161980f4 DM |
398 | if ((dev->flags & IFF_LOOPBACK) && |
399 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
400 | return 1; | |
401 | return 0; | |
554cfb7e | 402 | } |
1da177e4 | 403 | |
b6f99a21 | 404 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 405 | { |
554cfb7e | 406 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 407 | int m; |
4d0c5911 YH |
408 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
409 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
410 | m = 1; | |
411 | else if (neigh) { | |
554cfb7e YH |
412 | read_lock_bh(&neigh->lock); |
413 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 414 | m = 2; |
398bcbeb YH |
415 | #ifdef CONFIG_IPV6_ROUTER_PREF |
416 | else if (neigh->nud_state & NUD_FAILED) | |
417 | m = 0; | |
418 | #endif | |
419 | else | |
ea73ee23 | 420 | m = 1; |
554cfb7e | 421 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
422 | } else |
423 | m = 0; | |
554cfb7e | 424 | return m; |
1da177e4 LT |
425 | } |
426 | ||
554cfb7e YH |
427 | static int rt6_score_route(struct rt6_info *rt, int oif, |
428 | int strict) | |
1da177e4 | 429 | { |
4d0c5911 | 430 | int m, n; |
1ab1457c | 431 | |
4d0c5911 | 432 | m = rt6_check_dev(rt, oif); |
77d16f45 | 433 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 434 | return -1; |
ebacaaa0 YH |
435 | #ifdef CONFIG_IPV6_ROUTER_PREF |
436 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
437 | #endif | |
4d0c5911 | 438 | n = rt6_check_neigh(rt); |
557e92ef | 439 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
440 | return -1; |
441 | return m; | |
442 | } | |
443 | ||
f11e6659 DM |
444 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
445 | int *mpri, struct rt6_info *match) | |
554cfb7e | 446 | { |
f11e6659 DM |
447 | int m; |
448 | ||
449 | if (rt6_check_expired(rt)) | |
450 | goto out; | |
451 | ||
452 | m = rt6_score_route(rt, oif, strict); | |
453 | if (m < 0) | |
454 | goto out; | |
455 | ||
456 | if (m > *mpri) { | |
457 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
458 | rt6_probe(match); | |
459 | *mpri = m; | |
460 | match = rt; | |
461 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
462 | rt6_probe(rt); | |
463 | } | |
464 | ||
465 | out: | |
466 | return match; | |
467 | } | |
468 | ||
469 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
470 | struct rt6_info *rr_head, | |
471 | u32 metric, int oif, int strict) | |
472 | { | |
473 | struct rt6_info *rt, *match; | |
554cfb7e | 474 | int mpri = -1; |
1da177e4 | 475 | |
f11e6659 DM |
476 | match = NULL; |
477 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 478 | rt = rt->dst.rt6_next) |
f11e6659 DM |
479 | match = find_match(rt, oif, strict, &mpri, match); |
480 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 481 | rt = rt->dst.rt6_next) |
f11e6659 | 482 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 483 | |
f11e6659 DM |
484 | return match; |
485 | } | |
1da177e4 | 486 | |
f11e6659 DM |
487 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
488 | { | |
489 | struct rt6_info *match, *rt0; | |
8ed67789 | 490 | struct net *net; |
1da177e4 | 491 | |
f11e6659 | 492 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 493 | __func__, fn->leaf, oif); |
554cfb7e | 494 | |
f11e6659 DM |
495 | rt0 = fn->rr_ptr; |
496 | if (!rt0) | |
497 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 498 | |
f11e6659 | 499 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 500 | |
554cfb7e | 501 | if (!match && |
f11e6659 | 502 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 503 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 504 | |
554cfb7e | 505 | /* no entries matched; do round-robin */ |
f11e6659 DM |
506 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
507 | next = fn->leaf; | |
508 | ||
509 | if (next != rt0) | |
510 | fn->rr_ptr = next; | |
1da177e4 | 511 | } |
1da177e4 | 512 | |
f11e6659 | 513 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 514 | __func__, match); |
1da177e4 | 515 | |
c346dca1 | 516 | net = dev_net(rt0->rt6i_dev); |
a02cec21 | 517 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
518 | } |
519 | ||
70ceb4f5 YH |
520 | #ifdef CONFIG_IPV6_ROUTE_INFO |
521 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 522 | const struct in6_addr *gwaddr) |
70ceb4f5 | 523 | { |
c346dca1 | 524 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
525 | struct route_info *rinfo = (struct route_info *) opt; |
526 | struct in6_addr prefix_buf, *prefix; | |
527 | unsigned int pref; | |
4bed72e4 | 528 | unsigned long lifetime; |
70ceb4f5 YH |
529 | struct rt6_info *rt; |
530 | ||
531 | if (len < sizeof(struct route_info)) { | |
532 | return -EINVAL; | |
533 | } | |
534 | ||
535 | /* Sanity check for prefix_len and length */ | |
536 | if (rinfo->length > 3) { | |
537 | return -EINVAL; | |
538 | } else if (rinfo->prefix_len > 128) { | |
539 | return -EINVAL; | |
540 | } else if (rinfo->prefix_len > 64) { | |
541 | if (rinfo->length < 2) { | |
542 | return -EINVAL; | |
543 | } | |
544 | } else if (rinfo->prefix_len > 0) { | |
545 | if (rinfo->length < 1) { | |
546 | return -EINVAL; | |
547 | } | |
548 | } | |
549 | ||
550 | pref = rinfo->route_pref; | |
551 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 552 | return -EINVAL; |
70ceb4f5 | 553 | |
4bed72e4 | 554 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
555 | |
556 | if (rinfo->length == 3) | |
557 | prefix = (struct in6_addr *)rinfo->prefix; | |
558 | else { | |
559 | /* this function is safe */ | |
560 | ipv6_addr_prefix(&prefix_buf, | |
561 | (struct in6_addr *)rinfo->prefix, | |
562 | rinfo->prefix_len); | |
563 | prefix = &prefix_buf; | |
564 | } | |
565 | ||
efa2cea0 DL |
566 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
567 | dev->ifindex); | |
70ceb4f5 YH |
568 | |
569 | if (rt && !lifetime) { | |
e0a1ad73 | 570 | ip6_del_rt(rt); |
70ceb4f5 YH |
571 | rt = NULL; |
572 | } | |
573 | ||
574 | if (!rt && lifetime) | |
efa2cea0 | 575 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
576 | pref); |
577 | else if (rt) | |
578 | rt->rt6i_flags = RTF_ROUTEINFO | | |
579 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
580 | ||
581 | if (rt) { | |
4bed72e4 | 582 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
583 | rt->rt6i_flags &= ~RTF_EXPIRES; |
584 | } else { | |
585 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
586 | rt->rt6i_flags |= RTF_EXPIRES; | |
587 | } | |
d8d1f30b | 588 | dst_release(&rt->dst); |
70ceb4f5 YH |
589 | } |
590 | return 0; | |
591 | } | |
592 | #endif | |
593 | ||
8ed67789 | 594 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 595 | do { \ |
8ed67789 | 596 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 597 | struct fib6_node *pn; \ |
e0eda7bb | 598 | while (1) { \ |
982f56f3 YH |
599 | if (fn->fn_flags & RTN_TL_ROOT) \ |
600 | goto out; \ | |
601 | pn = fn->parent; \ | |
602 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 603 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
604 | else \ |
605 | fn = pn; \ | |
606 | if (fn->fn_flags & RTN_RTINFO) \ | |
607 | goto restart; \ | |
c71099ac | 608 | } \ |
c71099ac | 609 | } \ |
982f56f3 | 610 | } while(0) |
c71099ac | 611 | |
8ed67789 DL |
612 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
613 | struct fib6_table *table, | |
4c9483b2 | 614 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
615 | { |
616 | struct fib6_node *fn; | |
617 | struct rt6_info *rt; | |
618 | ||
c71099ac | 619 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 620 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
621 | restart: |
622 | rt = fn->leaf; | |
4c9483b2 DM |
623 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
624 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 625 | out: |
d8d1f30b | 626 | dst_use(&rt->dst, jiffies); |
c71099ac | 627 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
628 | return rt; |
629 | ||
630 | } | |
631 | ||
9acd9f3a YH |
632 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
633 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 634 | { |
4c9483b2 DM |
635 | struct flowi6 fl6 = { |
636 | .flowi6_oif = oif, | |
637 | .daddr = *daddr, | |
c71099ac TG |
638 | }; |
639 | struct dst_entry *dst; | |
77d16f45 | 640 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 641 | |
adaa70bb | 642 | if (saddr) { |
4c9483b2 | 643 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
644 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
645 | } | |
646 | ||
4c9483b2 | 647 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
648 | if (dst->error == 0) |
649 | return (struct rt6_info *) dst; | |
650 | ||
651 | dst_release(dst); | |
652 | ||
1da177e4 LT |
653 | return NULL; |
654 | } | |
655 | ||
7159039a YH |
656 | EXPORT_SYMBOL(rt6_lookup); |
657 | ||
c71099ac | 658 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
659 | It takes new route entry, the addition fails by any reason the |
660 | route is freed. In any case, if caller does not hold it, it may | |
661 | be destroyed. | |
662 | */ | |
663 | ||
86872cb5 | 664 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
665 | { |
666 | int err; | |
c71099ac | 667 | struct fib6_table *table; |
1da177e4 | 668 | |
c71099ac TG |
669 | table = rt->rt6i_table; |
670 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 671 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 672 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
673 | |
674 | return err; | |
675 | } | |
676 | ||
40e22e8f TG |
677 | int ip6_ins_rt(struct rt6_info *rt) |
678 | { | |
4d1169c1 | 679 | struct nl_info info = { |
c346dca1 | 680 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 681 | }; |
528c4ceb | 682 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
683 | } |
684 | ||
b71d1d42 ED |
685 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, const struct in6_addr *daddr, |
686 | const struct in6_addr *saddr) | |
1da177e4 | 687 | { |
1da177e4 LT |
688 | struct rt6_info *rt; |
689 | ||
690 | /* | |
691 | * Clone the route. | |
692 | */ | |
693 | ||
694 | rt = ip6_rt_copy(ort); | |
695 | ||
696 | if (rt) { | |
14deae41 DM |
697 | struct neighbour *neigh; |
698 | int attempts = !in_softirq(); | |
699 | ||
58c4fb86 YH |
700 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
701 | if (rt->rt6i_dst.plen != 128 && | |
702 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
703 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 704 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 705 | } |
1da177e4 | 706 | |
58c4fb86 | 707 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
708 | rt->rt6i_dst.plen = 128; |
709 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 710 | rt->dst.flags |= DST_HOST; |
1da177e4 LT |
711 | |
712 | #ifdef CONFIG_IPV6_SUBTREES | |
713 | if (rt->rt6i_src.plen && saddr) { | |
714 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
715 | rt->rt6i_src.plen = 128; | |
716 | } | |
717 | #endif | |
718 | ||
14deae41 DM |
719 | retry: |
720 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
721 | if (IS_ERR(neigh)) { | |
722 | struct net *net = dev_net(rt->rt6i_dev); | |
723 | int saved_rt_min_interval = | |
724 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
725 | int saved_rt_elasticity = | |
726 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
727 | ||
728 | if (attempts-- > 0) { | |
729 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
730 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
731 | ||
86393e52 | 732 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
733 | |
734 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
735 | saved_rt_elasticity; | |
736 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
737 | saved_rt_min_interval; | |
738 | goto retry; | |
739 | } | |
740 | ||
741 | if (net_ratelimit()) | |
742 | printk(KERN_WARNING | |
7e1b33e5 | 743 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 744 | dst_free(&rt->dst); |
14deae41 DM |
745 | return NULL; |
746 | } | |
747 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 748 | |
95a9a5ba | 749 | } |
1da177e4 | 750 | |
95a9a5ba YH |
751 | return rt; |
752 | } | |
1da177e4 | 753 | |
b71d1d42 | 754 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, const struct in6_addr *daddr) |
299d9939 YH |
755 | { |
756 | struct rt6_info *rt = ip6_rt_copy(ort); | |
757 | if (rt) { | |
758 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
759 | rt->rt6i_dst.plen = 128; | |
760 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 761 | rt->dst.flags |= DST_HOST; |
299d9939 YH |
762 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
763 | } | |
764 | return rt; | |
765 | } | |
766 | ||
8ed67789 | 767 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 768 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
769 | { |
770 | struct fib6_node *fn; | |
519fbd87 | 771 | struct rt6_info *rt, *nrt; |
c71099ac | 772 | int strict = 0; |
1da177e4 | 773 | int attempts = 3; |
519fbd87 | 774 | int err; |
53b7997f | 775 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 776 | |
77d16f45 | 777 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
778 | |
779 | relookup: | |
c71099ac | 780 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 781 | |
8238dd06 | 782 | restart_2: |
4c9483b2 | 783 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
784 | |
785 | restart: | |
4acad72d | 786 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 787 | |
4c9483b2 | 788 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 789 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 790 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 791 | goto out; |
1da177e4 | 792 | |
d8d1f30b | 793 | dst_hold(&rt->dst); |
c71099ac | 794 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 795 | |
519fbd87 | 796 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 797 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 798 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 799 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
800 | else |
801 | goto out2; | |
e40cf353 | 802 | |
d8d1f30b | 803 | dst_release(&rt->dst); |
8ed67789 | 804 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 805 | |
d8d1f30b | 806 | dst_hold(&rt->dst); |
519fbd87 | 807 | if (nrt) { |
40e22e8f | 808 | err = ip6_ins_rt(nrt); |
519fbd87 | 809 | if (!err) |
1da177e4 | 810 | goto out2; |
1da177e4 | 811 | } |
1da177e4 | 812 | |
519fbd87 YH |
813 | if (--attempts <= 0) |
814 | goto out2; | |
815 | ||
816 | /* | |
c71099ac | 817 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
818 | * released someone could insert this route. Relookup. |
819 | */ | |
d8d1f30b | 820 | dst_release(&rt->dst); |
519fbd87 YH |
821 | goto relookup; |
822 | ||
823 | out: | |
8238dd06 YH |
824 | if (reachable) { |
825 | reachable = 0; | |
826 | goto restart_2; | |
827 | } | |
d8d1f30b | 828 | dst_hold(&rt->dst); |
c71099ac | 829 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 830 | out2: |
d8d1f30b CG |
831 | rt->dst.lastuse = jiffies; |
832 | rt->dst.__use++; | |
c71099ac TG |
833 | |
834 | return rt; | |
1da177e4 LT |
835 | } |
836 | ||
8ed67789 | 837 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 838 | struct flowi6 *fl6, int flags) |
4acad72d | 839 | { |
4c9483b2 | 840 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
841 | } |
842 | ||
c71099ac TG |
843 | void ip6_route_input(struct sk_buff *skb) |
844 | { | |
b71d1d42 | 845 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 846 | struct net *net = dev_net(skb->dev); |
adaa70bb | 847 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
848 | struct flowi6 fl6 = { |
849 | .flowi6_iif = skb->dev->ifindex, | |
850 | .daddr = iph->daddr, | |
851 | .saddr = iph->saddr, | |
852 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, | |
853 | .flowi6_mark = skb->mark, | |
854 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 855 | }; |
adaa70bb | 856 | |
1d6e55f1 | 857 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 858 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 859 | |
4c9483b2 | 860 | skb_dst_set(skb, fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_input)); |
c71099ac TG |
861 | } |
862 | ||
8ed67789 | 863 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 864 | struct flowi6 *fl6, int flags) |
1da177e4 | 865 | { |
4c9483b2 | 866 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
867 | } |
868 | ||
9c7a4f9c | 869 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 870 | struct flowi6 *fl6) |
c71099ac TG |
871 | { |
872 | int flags = 0; | |
873 | ||
4c9483b2 | 874 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 875 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 876 | |
4c9483b2 | 877 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 878 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
879 | else if (sk) |
880 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 881 | |
4c9483b2 | 882 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
883 | } |
884 | ||
7159039a | 885 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 886 | |
2774c131 | 887 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 888 | { |
5c1e6aa3 | 889 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
890 | struct dst_entry *new = NULL; |
891 | ||
5c1e6aa3 | 892 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 893 | if (rt) { |
cf911662 DM |
894 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
895 | ||
d8d1f30b | 896 | new = &rt->dst; |
14e50e57 | 897 | |
14e50e57 | 898 | new->__use = 1; |
352e512c HX |
899 | new->input = dst_discard; |
900 | new->output = dst_discard; | |
14e50e57 | 901 | |
defb3519 | 902 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
903 | rt->rt6i_idev = ort->rt6i_idev; |
904 | if (rt->rt6i_idev) | |
905 | in6_dev_hold(rt->rt6i_idev); | |
906 | rt->rt6i_expires = 0; | |
907 | ||
908 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
909 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
910 | rt->rt6i_metric = 0; | |
911 | ||
912 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
913 | #ifdef CONFIG_IPV6_SUBTREES | |
914 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
915 | #endif | |
916 | ||
917 | dst_free(new); | |
918 | } | |
919 | ||
69ead7af DM |
920 | dst_release(dst_orig); |
921 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 922 | } |
14e50e57 | 923 | |
1da177e4 LT |
924 | /* |
925 | * Destination cache support functions | |
926 | */ | |
927 | ||
928 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
929 | { | |
930 | struct rt6_info *rt; | |
931 | ||
932 | rt = (struct rt6_info *) dst; | |
933 | ||
6431cbc2 DM |
934 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
935 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
936 | if (!rt->rt6i_peer) | |
937 | rt6_bind_peer(rt, 0); | |
938 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
939 | } | |
1da177e4 | 940 | return dst; |
6431cbc2 | 941 | } |
1da177e4 LT |
942 | return NULL; |
943 | } | |
944 | ||
945 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
946 | { | |
947 | struct rt6_info *rt = (struct rt6_info *) dst; | |
948 | ||
949 | if (rt) { | |
54c1a859 YH |
950 | if (rt->rt6i_flags & RTF_CACHE) { |
951 | if (rt6_check_expired(rt)) { | |
952 | ip6_del_rt(rt); | |
953 | dst = NULL; | |
954 | } | |
955 | } else { | |
1da177e4 | 956 | dst_release(dst); |
54c1a859 YH |
957 | dst = NULL; |
958 | } | |
1da177e4 | 959 | } |
54c1a859 | 960 | return dst; |
1da177e4 LT |
961 | } |
962 | ||
963 | static void ip6_link_failure(struct sk_buff *skb) | |
964 | { | |
965 | struct rt6_info *rt; | |
966 | ||
3ffe533c | 967 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 968 | |
adf30907 | 969 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
970 | if (rt) { |
971 | if (rt->rt6i_flags&RTF_CACHE) { | |
d8d1f30b | 972 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
973 | rt->rt6i_flags |= RTF_EXPIRES; |
974 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
975 | rt->rt6i_node->fn_sernum = -1; | |
976 | } | |
977 | } | |
978 | ||
979 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
980 | { | |
981 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
982 | ||
983 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
984 | rt6->rt6i_flags |= RTF_MODIFIED; | |
985 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 986 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 987 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
988 | features |= RTAX_FEATURE_ALLFRAG; |
989 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 990 | } |
defb3519 | 991 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
992 | } |
993 | } | |
994 | ||
0dbaee3b | 995 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 996 | { |
0dbaee3b DM |
997 | struct net_device *dev = dst->dev; |
998 | unsigned int mtu = dst_mtu(dst); | |
999 | struct net *net = dev_net(dev); | |
1000 | ||
1da177e4 LT |
1001 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1002 | ||
5578689a DL |
1003 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1004 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1005 | |
1006 | /* | |
1ab1457c YH |
1007 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1008 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1009 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1010 | * rely only on pmtu discovery" |
1011 | */ | |
1012 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1013 | mtu = IPV6_MAXPLEN; | |
1014 | return mtu; | |
1015 | } | |
1016 | ||
d33e4553 DM |
1017 | static unsigned int ip6_default_mtu(const struct dst_entry *dst) |
1018 | { | |
1019 | unsigned int mtu = IPV6_MIN_MTU; | |
1020 | struct inet6_dev *idev; | |
1021 | ||
1022 | rcu_read_lock(); | |
1023 | idev = __in6_dev_get(dst->dev); | |
1024 | if (idev) | |
1025 | mtu = idev->cnf.mtu6; | |
1026 | rcu_read_unlock(); | |
1027 | ||
1028 | return mtu; | |
1029 | } | |
1030 | ||
3b00944c YH |
1031 | static struct dst_entry *icmp6_dst_gc_list; |
1032 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1033 | |
3b00944c | 1034 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1035 | struct neighbour *neigh, |
9acd9f3a | 1036 | const struct in6_addr *addr) |
1da177e4 LT |
1037 | { |
1038 | struct rt6_info *rt; | |
1039 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1040 | struct net *net = dev_net(dev); |
1da177e4 LT |
1041 | |
1042 | if (unlikely(idev == NULL)) | |
1043 | return NULL; | |
1044 | ||
5c1e6aa3 | 1045 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev); |
1da177e4 LT |
1046 | if (unlikely(rt == NULL)) { |
1047 | in6_dev_put(idev); | |
1048 | goto out; | |
1049 | } | |
1050 | ||
1da177e4 LT |
1051 | if (neigh) |
1052 | neigh_hold(neigh); | |
14deae41 | 1053 | else { |
1da177e4 | 1054 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
1055 | if (IS_ERR(neigh)) |
1056 | neigh = NULL; | |
1057 | } | |
1da177e4 | 1058 | |
1da177e4 LT |
1059 | rt->rt6i_idev = idev; |
1060 | rt->rt6i_nexthop = neigh; | |
d8d1f30b | 1061 | atomic_set(&rt->dst.__refcnt, 1); |
defb3519 | 1062 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
d8d1f30b | 1063 | rt->dst.output = ip6_output; |
1da177e4 LT |
1064 | |
1065 | #if 0 /* there's no chance to use these for ndisc */ | |
d8d1f30b | 1066 | rt->dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1ab1457c | 1067 | ? DST_HOST |
1da177e4 LT |
1068 | : 0; |
1069 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1070 | rt->rt6i_dst.plen = 128; | |
1071 | #endif | |
1072 | ||
3b00944c | 1073 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1074 | rt->dst.next = icmp6_dst_gc_list; |
1075 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1076 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1077 | |
5578689a | 1078 | fib6_force_start_gc(net); |
1da177e4 LT |
1079 | |
1080 | out: | |
d8d1f30b | 1081 | return &rt->dst; |
1da177e4 LT |
1082 | } |
1083 | ||
3d0f24a7 | 1084 | int icmp6_dst_gc(void) |
1da177e4 | 1085 | { |
e9476e95 | 1086 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1087 | int more = 0; |
1da177e4 | 1088 | |
3b00944c YH |
1089 | spin_lock_bh(&icmp6_dst_lock); |
1090 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1091 | |
1da177e4 LT |
1092 | while ((dst = *pprev) != NULL) { |
1093 | if (!atomic_read(&dst->__refcnt)) { | |
1094 | *pprev = dst->next; | |
1095 | dst_free(dst); | |
1da177e4 LT |
1096 | } else { |
1097 | pprev = &dst->next; | |
3d0f24a7 | 1098 | ++more; |
1da177e4 LT |
1099 | } |
1100 | } | |
1101 | ||
3b00944c | 1102 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1103 | |
3d0f24a7 | 1104 | return more; |
1da177e4 LT |
1105 | } |
1106 | ||
1e493d19 DM |
1107 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1108 | void *arg) | |
1109 | { | |
1110 | struct dst_entry *dst, **pprev; | |
1111 | ||
1112 | spin_lock_bh(&icmp6_dst_lock); | |
1113 | pprev = &icmp6_dst_gc_list; | |
1114 | while ((dst = *pprev) != NULL) { | |
1115 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1116 | if (func(rt, arg)) { | |
1117 | *pprev = dst->next; | |
1118 | dst_free(dst); | |
1119 | } else { | |
1120 | pprev = &dst->next; | |
1121 | } | |
1122 | } | |
1123 | spin_unlock_bh(&icmp6_dst_lock); | |
1124 | } | |
1125 | ||
569d3645 | 1126 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1127 | { |
1da177e4 | 1128 | unsigned long now = jiffies; |
86393e52 | 1129 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1130 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1131 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1132 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1133 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1134 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1135 | int entries; |
7019b78e | 1136 | |
fc66f95c | 1137 | entries = dst_entries_get_fast(ops); |
7019b78e | 1138 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1139 | entries <= rt_max_size) |
1da177e4 LT |
1140 | goto out; |
1141 | ||
6891a346 BT |
1142 | net->ipv6.ip6_rt_gc_expire++; |
1143 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1144 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1145 | entries = dst_entries_get_slow(ops); |
1146 | if (entries < ops->gc_thresh) | |
7019b78e | 1147 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1148 | out: |
7019b78e | 1149 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1150 | return entries > rt_max_size; |
1da177e4 LT |
1151 | } |
1152 | ||
1153 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1154 | but results in cleaner routing tables. | |
1155 | ||
1156 | Remove it only when all the things will work! | |
1157 | */ | |
1158 | ||
6b75d090 | 1159 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1160 | { |
5170ae82 | 1161 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1162 | if (hoplimit == 0) { |
6b75d090 | 1163 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1164 | struct inet6_dev *idev; |
1165 | ||
1166 | rcu_read_lock(); | |
1167 | idev = __in6_dev_get(dev); | |
1168 | if (idev) | |
6b75d090 | 1169 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1170 | else |
53b7997f | 1171 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1172 | rcu_read_unlock(); |
1da177e4 LT |
1173 | } |
1174 | return hoplimit; | |
1175 | } | |
abbf46ae | 1176 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1177 | |
1178 | /* | |
1179 | * | |
1180 | */ | |
1181 | ||
86872cb5 | 1182 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1183 | { |
1184 | int err; | |
5578689a | 1185 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1186 | struct rt6_info *rt = NULL; |
1187 | struct net_device *dev = NULL; | |
1188 | struct inet6_dev *idev = NULL; | |
c71099ac | 1189 | struct fib6_table *table; |
1da177e4 LT |
1190 | int addr_type; |
1191 | ||
86872cb5 | 1192 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1193 | return -EINVAL; |
1194 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1195 | if (cfg->fc_src_len) |
1da177e4 LT |
1196 | return -EINVAL; |
1197 | #endif | |
86872cb5 | 1198 | if (cfg->fc_ifindex) { |
1da177e4 | 1199 | err = -ENODEV; |
5578689a | 1200 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1201 | if (!dev) |
1202 | goto out; | |
1203 | idev = in6_dev_get(dev); | |
1204 | if (!idev) | |
1205 | goto out; | |
1206 | } | |
1207 | ||
86872cb5 TG |
1208 | if (cfg->fc_metric == 0) |
1209 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1210 | |
5578689a | 1211 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1212 | if (table == NULL) { |
1213 | err = -ENOBUFS; | |
1214 | goto out; | |
1215 | } | |
1216 | ||
5c1e6aa3 | 1217 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL); |
1da177e4 LT |
1218 | |
1219 | if (rt == NULL) { | |
1220 | err = -ENOMEM; | |
1221 | goto out; | |
1222 | } | |
1223 | ||
d8d1f30b | 1224 | rt->dst.obsolete = -1; |
6f704992 YH |
1225 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1226 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1227 | 0; | |
1da177e4 | 1228 | |
86872cb5 TG |
1229 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1230 | cfg->fc_protocol = RTPROT_BOOT; | |
1231 | rt->rt6i_protocol = cfg->fc_protocol; | |
1232 | ||
1233 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1234 | |
1235 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1236 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1237 | else if (cfg->fc_flags & RTF_LOCAL) |
1238 | rt->dst.input = ip6_input; | |
1da177e4 | 1239 | else |
d8d1f30b | 1240 | rt->dst.input = ip6_forward; |
1da177e4 | 1241 | |
d8d1f30b | 1242 | rt->dst.output = ip6_output; |
1da177e4 | 1243 | |
86872cb5 TG |
1244 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1245 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1246 | if (rt->rt6i_dst.plen == 128) |
d8d1f30b | 1247 | rt->dst.flags = DST_HOST; |
1da177e4 LT |
1248 | |
1249 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1250 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1251 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1252 | #endif |
1253 | ||
86872cb5 | 1254 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1255 | |
1256 | /* We cannot add true routes via loopback here, | |
1257 | they would result in kernel looping; promote them to reject routes | |
1258 | */ | |
86872cb5 | 1259 | if ((cfg->fc_flags & RTF_REJECT) || |
ab79ad14 MŻ |
1260 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK) |
1261 | && !(cfg->fc_flags&RTF_LOCAL))) { | |
1da177e4 | 1262 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1263 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1264 | if (dev) { |
1265 | dev_put(dev); | |
1266 | in6_dev_put(idev); | |
1267 | } | |
5578689a | 1268 | dev = net->loopback_dev; |
1da177e4 LT |
1269 | dev_hold(dev); |
1270 | idev = in6_dev_get(dev); | |
1271 | if (!idev) { | |
1272 | err = -ENODEV; | |
1273 | goto out; | |
1274 | } | |
1275 | } | |
d8d1f30b CG |
1276 | rt->dst.output = ip6_pkt_discard_out; |
1277 | rt->dst.input = ip6_pkt_discard; | |
1278 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1279 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1280 | goto install_route; | |
1281 | } | |
1282 | ||
86872cb5 | 1283 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1284 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1285 | int gwa_type; |
1286 | ||
86872cb5 TG |
1287 | gw_addr = &cfg->fc_gateway; |
1288 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1289 | gwa_type = ipv6_addr_type(gw_addr); |
1290 | ||
1291 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1292 | struct rt6_info *grt; | |
1293 | ||
1294 | /* IPv6 strictly inhibits using not link-local | |
1295 | addresses as nexthop address. | |
1296 | Otherwise, router will not able to send redirects. | |
1297 | It is very good, but in some (rare!) circumstances | |
1298 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1299 | some exceptions. --ANK | |
1300 | */ | |
1301 | err = -EINVAL; | |
1302 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1303 | goto out; | |
1304 | ||
5578689a | 1305 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1306 | |
1307 | err = -EHOSTUNREACH; | |
1308 | if (grt == NULL) | |
1309 | goto out; | |
1310 | if (dev) { | |
1311 | if (dev != grt->rt6i_dev) { | |
d8d1f30b | 1312 | dst_release(&grt->dst); |
1da177e4 LT |
1313 | goto out; |
1314 | } | |
1315 | } else { | |
1316 | dev = grt->rt6i_dev; | |
1317 | idev = grt->rt6i_idev; | |
1318 | dev_hold(dev); | |
1319 | in6_dev_hold(grt->rt6i_idev); | |
1320 | } | |
1321 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1322 | err = 0; | |
d8d1f30b | 1323 | dst_release(&grt->dst); |
1da177e4 LT |
1324 | |
1325 | if (err) | |
1326 | goto out; | |
1327 | } | |
1328 | err = -EINVAL; | |
1329 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1330 | goto out; | |
1331 | } | |
1332 | ||
1333 | err = -ENODEV; | |
1334 | if (dev == NULL) | |
1335 | goto out; | |
1336 | ||
c3968a85 DW |
1337 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1338 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1339 | err = -EINVAL; | |
1340 | goto out; | |
1341 | } | |
1342 | ipv6_addr_copy(&rt->rt6i_prefsrc.addr, &cfg->fc_prefsrc); | |
1343 | rt->rt6i_prefsrc.plen = 128; | |
1344 | } else | |
1345 | rt->rt6i_prefsrc.plen = 0; | |
1346 | ||
86872cb5 | 1347 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1348 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1349 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1350 | err = PTR_ERR(rt->rt6i_nexthop); | |
1351 | rt->rt6i_nexthop = NULL; | |
1352 | goto out; | |
1353 | } | |
1354 | } | |
1355 | ||
86872cb5 | 1356 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1357 | |
1358 | install_route: | |
86872cb5 TG |
1359 | if (cfg->fc_mx) { |
1360 | struct nlattr *nla; | |
1361 | int remaining; | |
1362 | ||
1363 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1364 | int type = nla_type(nla); |
86872cb5 TG |
1365 | |
1366 | if (type) { | |
1367 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1368 | err = -EINVAL; |
1369 | goto out; | |
1370 | } | |
86872cb5 | 1371 | |
defb3519 | 1372 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1373 | } |
1da177e4 LT |
1374 | } |
1375 | } | |
1376 | ||
d8d1f30b | 1377 | rt->dst.dev = dev; |
1da177e4 | 1378 | rt->rt6i_idev = idev; |
c71099ac | 1379 | rt->rt6i_table = table; |
63152fc0 | 1380 | |
c346dca1 | 1381 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1382 | |
86872cb5 | 1383 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1384 | |
1385 | out: | |
1386 | if (dev) | |
1387 | dev_put(dev); | |
1388 | if (idev) | |
1389 | in6_dev_put(idev); | |
1390 | if (rt) | |
d8d1f30b | 1391 | dst_free(&rt->dst); |
1da177e4 LT |
1392 | return err; |
1393 | } | |
1394 | ||
86872cb5 | 1395 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1396 | { |
1397 | int err; | |
c71099ac | 1398 | struct fib6_table *table; |
c346dca1 | 1399 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1400 | |
8ed67789 | 1401 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1402 | return -ENOENT; |
1403 | ||
c71099ac TG |
1404 | table = rt->rt6i_table; |
1405 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1406 | |
86872cb5 | 1407 | err = fib6_del(rt, info); |
d8d1f30b | 1408 | dst_release(&rt->dst); |
1da177e4 | 1409 | |
c71099ac | 1410 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1411 | |
1412 | return err; | |
1413 | } | |
1414 | ||
e0a1ad73 TG |
1415 | int ip6_del_rt(struct rt6_info *rt) |
1416 | { | |
4d1169c1 | 1417 | struct nl_info info = { |
c346dca1 | 1418 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1419 | }; |
528c4ceb | 1420 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1421 | } |
1422 | ||
86872cb5 | 1423 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1424 | { |
c71099ac | 1425 | struct fib6_table *table; |
1da177e4 LT |
1426 | struct fib6_node *fn; |
1427 | struct rt6_info *rt; | |
1428 | int err = -ESRCH; | |
1429 | ||
5578689a | 1430 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1431 | if (table == NULL) |
1432 | return err; | |
1433 | ||
1434 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1435 | |
c71099ac | 1436 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1437 | &cfg->fc_dst, cfg->fc_dst_len, |
1438 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1439 | |
1da177e4 | 1440 | if (fn) { |
d8d1f30b | 1441 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1442 | if (cfg->fc_ifindex && |
1da177e4 | 1443 | (rt->rt6i_dev == NULL || |
86872cb5 | 1444 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1445 | continue; |
86872cb5 TG |
1446 | if (cfg->fc_flags & RTF_GATEWAY && |
1447 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1448 | continue; |
86872cb5 | 1449 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1450 | continue; |
d8d1f30b | 1451 | dst_hold(&rt->dst); |
c71099ac | 1452 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1453 | |
86872cb5 | 1454 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1455 | } |
1456 | } | |
c71099ac | 1457 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1458 | |
1459 | return err; | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * Handle redirects | |
1464 | */ | |
a6279458 | 1465 | struct ip6rd_flowi { |
4c9483b2 | 1466 | struct flowi6 fl6; |
a6279458 YH |
1467 | struct in6_addr gateway; |
1468 | }; | |
1469 | ||
8ed67789 DL |
1470 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1471 | struct fib6_table *table, | |
4c9483b2 | 1472 | struct flowi6 *fl6, |
a6279458 | 1473 | int flags) |
1da177e4 | 1474 | { |
4c9483b2 | 1475 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
a6279458 | 1476 | struct rt6_info *rt; |
e843b9e1 | 1477 | struct fib6_node *fn; |
c71099ac | 1478 | |
1da177e4 | 1479 | /* |
e843b9e1 YH |
1480 | * Get the "current" route for this destination and |
1481 | * check if the redirect has come from approriate router. | |
1482 | * | |
1483 | * RFC 2461 specifies that redirects should only be | |
1484 | * accepted if they come from the nexthop to the target. | |
1485 | * Due to the way the routes are chosen, this notion | |
1486 | * is a bit fuzzy and one might need to check all possible | |
1487 | * routes. | |
1da177e4 | 1488 | */ |
1da177e4 | 1489 | |
c71099ac | 1490 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 1491 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
e843b9e1 | 1492 | restart: |
d8d1f30b | 1493 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1494 | /* |
1495 | * Current route is on-link; redirect is always invalid. | |
1496 | * | |
1497 | * Seems, previous statement is not true. It could | |
1498 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1499 | * But then router serving it might decide, that we should | |
1500 | * know truth 8)8) --ANK (980726). | |
1501 | */ | |
1502 | if (rt6_check_expired(rt)) | |
1503 | continue; | |
1504 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1505 | continue; | |
4c9483b2 | 1506 | if (fl6->flowi6_oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1507 | continue; |
a6279458 | 1508 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1509 | continue; |
1510 | break; | |
1511 | } | |
a6279458 | 1512 | |
cb15d9c2 | 1513 | if (!rt) |
8ed67789 | 1514 | rt = net->ipv6.ip6_null_entry; |
4c9483b2 | 1515 | BACKTRACK(net, &fl6->saddr); |
cb15d9c2 | 1516 | out: |
d8d1f30b | 1517 | dst_hold(&rt->dst); |
a6279458 | 1518 | |
c71099ac | 1519 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1520 | |
a6279458 YH |
1521 | return rt; |
1522 | }; | |
1523 | ||
b71d1d42 ED |
1524 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
1525 | const struct in6_addr *src, | |
1526 | const struct in6_addr *gateway, | |
a6279458 YH |
1527 | struct net_device *dev) |
1528 | { | |
adaa70bb | 1529 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1530 | struct net *net = dev_net(dev); |
a6279458 | 1531 | struct ip6rd_flowi rdfl = { |
4c9483b2 DM |
1532 | .fl6 = { |
1533 | .flowi6_oif = dev->ifindex, | |
1534 | .daddr = *dest, | |
1535 | .saddr = *src, | |
a6279458 | 1536 | }, |
a6279458 | 1537 | }; |
adaa70bb | 1538 | |
86c36ce4 BH |
1539 | ipv6_addr_copy(&rdfl.gateway, gateway); |
1540 | ||
adaa70bb TG |
1541 | if (rt6_need_strict(dest)) |
1542 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1543 | |
4c9483b2 | 1544 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
58f09b78 | 1545 | flags, __ip6_route_redirect); |
a6279458 YH |
1546 | } |
1547 | ||
b71d1d42 ED |
1548 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
1549 | const struct in6_addr *saddr, | |
a6279458 YH |
1550 | struct neighbour *neigh, u8 *lladdr, int on_link) |
1551 | { | |
1552 | struct rt6_info *rt, *nrt = NULL; | |
1553 | struct netevent_redirect netevent; | |
c346dca1 | 1554 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1555 | |
1556 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1557 | ||
8ed67789 | 1558 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1559 | if (net_ratelimit()) |
1560 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1561 | "for redirect target\n"); | |
a6279458 | 1562 | goto out; |
1da177e4 LT |
1563 | } |
1564 | ||
1da177e4 LT |
1565 | /* |
1566 | * We have finally decided to accept it. | |
1567 | */ | |
1568 | ||
1ab1457c | 1569 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1570 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1571 | NEIGH_UPDATE_F_OVERRIDE| | |
1572 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1573 | NEIGH_UPDATE_F_ISROUTER)) | |
1574 | ); | |
1575 | ||
1576 | /* | |
1577 | * Redirect received -> path was valid. | |
1578 | * Look, redirects are sent only in response to data packets, | |
1579 | * so that this nexthop apparently is reachable. --ANK | |
1580 | */ | |
d8d1f30b | 1581 | dst_confirm(&rt->dst); |
1da177e4 LT |
1582 | |
1583 | /* Duplicate redirect: silently ignore. */ | |
d8d1f30b | 1584 | if (neigh == rt->dst.neighbour) |
1da177e4 LT |
1585 | goto out; |
1586 | ||
1587 | nrt = ip6_rt_copy(rt); | |
1588 | if (nrt == NULL) | |
1589 | goto out; | |
1590 | ||
1591 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1592 | if (on_link) | |
1593 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1594 | ||
1595 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1596 | nrt->rt6i_dst.plen = 128; | |
d8d1f30b | 1597 | nrt->dst.flags |= DST_HOST; |
1da177e4 LT |
1598 | |
1599 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1600 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1da177e4 | 1601 | |
40e22e8f | 1602 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1603 | goto out; |
1604 | ||
d8d1f30b CG |
1605 | netevent.old = &rt->dst; |
1606 | netevent.new = &nrt->dst; | |
8d71740c TT |
1607 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1608 | ||
1da177e4 | 1609 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1610 | ip6_del_rt(rt); |
1da177e4 LT |
1611 | return; |
1612 | } | |
1613 | ||
1614 | out: | |
d8d1f30b | 1615 | dst_release(&rt->dst); |
1da177e4 LT |
1616 | } |
1617 | ||
1618 | /* | |
1619 | * Handle ICMP "packet too big" messages | |
1620 | * i.e. Path MTU discovery | |
1621 | */ | |
1622 | ||
b71d1d42 | 1623 | static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 | 1624 | struct net *net, u32 pmtu, int ifindex) |
1da177e4 LT |
1625 | { |
1626 | struct rt6_info *rt, *nrt; | |
1627 | int allfrag = 0; | |
d3052b55 | 1628 | again: |
ae878ae2 | 1629 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
1da177e4 LT |
1630 | if (rt == NULL) |
1631 | return; | |
1632 | ||
d3052b55 AV |
1633 | if (rt6_check_expired(rt)) { |
1634 | ip6_del_rt(rt); | |
1635 | goto again; | |
1636 | } | |
1637 | ||
d8d1f30b | 1638 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1639 | goto out; |
1640 | ||
1641 | if (pmtu < IPV6_MIN_MTU) { | |
1642 | /* | |
1ab1457c | 1643 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1644 | * MTU (1280) and a fragment header should always be included |
1645 | * after a node receiving Too Big message reporting PMTU is | |
1646 | * less than the IPv6 Minimum Link MTU. | |
1647 | */ | |
1648 | pmtu = IPV6_MIN_MTU; | |
1649 | allfrag = 1; | |
1650 | } | |
1651 | ||
1652 | /* New mtu received -> path was valid. | |
1653 | They are sent only in response to data packets, | |
1654 | so that this nexthop apparently is reachable. --ANK | |
1655 | */ | |
d8d1f30b | 1656 | dst_confirm(&rt->dst); |
1da177e4 LT |
1657 | |
1658 | /* Host route. If it is static, it would be better | |
1659 | not to override it, but add new one, so that | |
1660 | when cache entry will expire old pmtu | |
1661 | would return automatically. | |
1662 | */ | |
1663 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1664 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1665 | if (allfrag) { | |
1666 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1667 | features |= RTAX_FEATURE_ALLFRAG; | |
1668 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1669 | } | |
d8d1f30b | 1670 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1671 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1672 | goto out; | |
1673 | } | |
1674 | ||
1675 | /* Network route. | |
1676 | Two cases are possible: | |
1677 | 1. It is connected route. Action: COW | |
1678 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1679 | */ | |
d5315b50 | 1680 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1681 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1682 | else |
1683 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1684 | |
d5315b50 | 1685 | if (nrt) { |
defb3519 DM |
1686 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1687 | if (allfrag) { | |
1688 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1689 | features |= RTAX_FEATURE_ALLFRAG; | |
1690 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1691 | } | |
a1e78363 YH |
1692 | |
1693 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1694 | * happened within 5 mins, the recommended timer is 10 mins. | |
1695 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1696 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1697 | * and detecting PMTU increase will be automatically happened. | |
1698 | */ | |
d8d1f30b | 1699 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1700 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1701 | ||
40e22e8f | 1702 | ip6_ins_rt(nrt); |
1da177e4 | 1703 | } |
1da177e4 | 1704 | out: |
d8d1f30b | 1705 | dst_release(&rt->dst); |
1da177e4 LT |
1706 | } |
1707 | ||
b71d1d42 | 1708 | void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 MŻ |
1709 | struct net_device *dev, u32 pmtu) |
1710 | { | |
1711 | struct net *net = dev_net(dev); | |
1712 | ||
1713 | /* | |
1714 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1715 | * is sending along the path" that caused the Packet Too Big message. | |
1716 | * Since it's not possible in the general case to determine which | |
1717 | * interface was used to send the original packet, we update the MTU | |
1718 | * on the interface that will be used to send future packets. We also | |
1719 | * update the MTU on the interface that received the Packet Too Big in | |
1720 | * case the original packet was forced out that interface with | |
1721 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1722 | * correct behaviour, which would be to update the MTU on all | |
1723 | * interfaces. | |
1724 | */ | |
1725 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1726 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1727 | } | |
1728 | ||
1da177e4 LT |
1729 | /* |
1730 | * Misc support functions | |
1731 | */ | |
1732 | ||
1733 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1734 | { | |
c346dca1 | 1735 | struct net *net = dev_net(ort->rt6i_dev); |
5c1e6aa3 DM |
1736 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
1737 | ort->dst.dev); | |
1da177e4 LT |
1738 | |
1739 | if (rt) { | |
d8d1f30b CG |
1740 | rt->dst.input = ort->dst.input; |
1741 | rt->dst.output = ort->dst.output; | |
1742 | ||
defb3519 | 1743 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1744 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1745 | rt->rt6i_idev = ort->rt6i_idev; |
1746 | if (rt->rt6i_idev) | |
1747 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1748 | rt->dst.lastuse = jiffies; |
1da177e4 LT |
1749 | rt->rt6i_expires = 0; |
1750 | ||
1751 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1752 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1753 | rt->rt6i_metric = 0; | |
1754 | ||
1755 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1756 | #ifdef CONFIG_IPV6_SUBTREES | |
1757 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1758 | #endif | |
0f6c6392 | 1759 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1760 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1761 | } |
1762 | return rt; | |
1763 | } | |
1764 | ||
70ceb4f5 | 1765 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1766 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1767 | const struct in6_addr *prefix, int prefixlen, |
1768 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1769 | { |
1770 | struct fib6_node *fn; | |
1771 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1772 | struct fib6_table *table; |
1773 | ||
efa2cea0 | 1774 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1775 | if (table == NULL) |
1776 | return NULL; | |
70ceb4f5 | 1777 | |
c71099ac TG |
1778 | write_lock_bh(&table->tb6_lock); |
1779 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1780 | if (!fn) |
1781 | goto out; | |
1782 | ||
d8d1f30b | 1783 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
70ceb4f5 YH |
1784 | if (rt->rt6i_dev->ifindex != ifindex) |
1785 | continue; | |
1786 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1787 | continue; | |
1788 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1789 | continue; | |
d8d1f30b | 1790 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1791 | break; |
1792 | } | |
1793 | out: | |
c71099ac | 1794 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1795 | return rt; |
1796 | } | |
1797 | ||
efa2cea0 | 1798 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1799 | const struct in6_addr *prefix, int prefixlen, |
1800 | const struct in6_addr *gwaddr, int ifindex, | |
70ceb4f5 YH |
1801 | unsigned pref) |
1802 | { | |
86872cb5 TG |
1803 | struct fib6_config cfg = { |
1804 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1805 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1806 | .fc_ifindex = ifindex, |
1807 | .fc_dst_len = prefixlen, | |
1808 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1809 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1810 | .fc_nlinfo.pid = 0, |
1811 | .fc_nlinfo.nlh = NULL, | |
1812 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1813 | }; |
1814 | ||
1815 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1816 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1817 | |
e317da96 YH |
1818 | /* We should treat it as a default route if prefix length is 0. */ |
1819 | if (!prefixlen) | |
86872cb5 | 1820 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1821 | |
86872cb5 | 1822 | ip6_route_add(&cfg); |
70ceb4f5 | 1823 | |
efa2cea0 | 1824 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1825 | } |
1826 | #endif | |
1827 | ||
b71d1d42 | 1828 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1829 | { |
1da177e4 | 1830 | struct rt6_info *rt; |
c71099ac | 1831 | struct fib6_table *table; |
1da177e4 | 1832 | |
c346dca1 | 1833 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1834 | if (table == NULL) |
1835 | return NULL; | |
1da177e4 | 1836 | |
c71099ac | 1837 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1838 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
1da177e4 | 1839 | if (dev == rt->rt6i_dev && |
045927ff | 1840 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1841 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1842 | break; | |
1843 | } | |
1844 | if (rt) | |
d8d1f30b | 1845 | dst_hold(&rt->dst); |
c71099ac | 1846 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1847 | return rt; |
1848 | } | |
1849 | ||
b71d1d42 | 1850 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1851 | struct net_device *dev, |
1852 | unsigned int pref) | |
1da177e4 | 1853 | { |
86872cb5 TG |
1854 | struct fib6_config cfg = { |
1855 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1856 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1857 | .fc_ifindex = dev->ifindex, |
1858 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1859 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1860 | .fc_nlinfo.pid = 0, |
1861 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1862 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1863 | }; |
1da177e4 | 1864 | |
86872cb5 | 1865 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1866 | |
86872cb5 | 1867 | ip6_route_add(&cfg); |
1da177e4 | 1868 | |
1da177e4 LT |
1869 | return rt6_get_dflt_router(gwaddr, dev); |
1870 | } | |
1871 | ||
7b4da532 | 1872 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1873 | { |
1874 | struct rt6_info *rt; | |
c71099ac TG |
1875 | struct fib6_table *table; |
1876 | ||
1877 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1878 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1879 | if (table == NULL) |
1880 | return; | |
1da177e4 LT |
1881 | |
1882 | restart: | |
c71099ac | 1883 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1884 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1885 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1886 | dst_hold(&rt->dst); |
c71099ac | 1887 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1888 | ip6_del_rt(rt); |
1da177e4 LT |
1889 | goto restart; |
1890 | } | |
1891 | } | |
c71099ac | 1892 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1893 | } |
1894 | ||
5578689a DL |
1895 | static void rtmsg_to_fib6_config(struct net *net, |
1896 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1897 | struct fib6_config *cfg) |
1898 | { | |
1899 | memset(cfg, 0, sizeof(*cfg)); | |
1900 | ||
1901 | cfg->fc_table = RT6_TABLE_MAIN; | |
1902 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1903 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1904 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1905 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1906 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1907 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1908 | ||
5578689a | 1909 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1910 | |
86872cb5 TG |
1911 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1912 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1913 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1914 | } | |
1915 | ||
5578689a | 1916 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1917 | { |
86872cb5 | 1918 | struct fib6_config cfg; |
1da177e4 LT |
1919 | struct in6_rtmsg rtmsg; |
1920 | int err; | |
1921 | ||
1922 | switch(cmd) { | |
1923 | case SIOCADDRT: /* Add a route */ | |
1924 | case SIOCDELRT: /* Delete a route */ | |
1925 | if (!capable(CAP_NET_ADMIN)) | |
1926 | return -EPERM; | |
1927 | err = copy_from_user(&rtmsg, arg, | |
1928 | sizeof(struct in6_rtmsg)); | |
1929 | if (err) | |
1930 | return -EFAULT; | |
86872cb5 | 1931 | |
5578689a | 1932 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1933 | |
1da177e4 LT |
1934 | rtnl_lock(); |
1935 | switch (cmd) { | |
1936 | case SIOCADDRT: | |
86872cb5 | 1937 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1938 | break; |
1939 | case SIOCDELRT: | |
86872cb5 | 1940 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1941 | break; |
1942 | default: | |
1943 | err = -EINVAL; | |
1944 | } | |
1945 | rtnl_unlock(); | |
1946 | ||
1947 | return err; | |
3ff50b79 | 1948 | } |
1da177e4 LT |
1949 | |
1950 | return -EINVAL; | |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * Drop the packet on the floor | |
1955 | */ | |
1956 | ||
d5fdd6ba | 1957 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1958 | { |
612f09e8 | 1959 | int type; |
adf30907 | 1960 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1961 | switch (ipstats_mib_noroutes) { |
1962 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1963 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1964 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
1965 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1966 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1967 | break; |
1968 | } | |
1969 | /* FALLTHROUGH */ | |
1970 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1971 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1972 | ipstats_mib_noroutes); | |
612f09e8 YH |
1973 | break; |
1974 | } | |
3ffe533c | 1975 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
1976 | kfree_skb(skb); |
1977 | return 0; | |
1978 | } | |
1979 | ||
9ce8ade0 TG |
1980 | static int ip6_pkt_discard(struct sk_buff *skb) |
1981 | { | |
612f09e8 | 1982 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1983 | } |
1984 | ||
20380731 | 1985 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 1986 | { |
adf30907 | 1987 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1988 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1989 | } |
1990 | ||
6723ab54 DM |
1991 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1992 | ||
9ce8ade0 TG |
1993 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1994 | { | |
612f09e8 | 1995 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1996 | } |
1997 | ||
1998 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1999 | { | |
adf30907 | 2000 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2001 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2002 | } |
2003 | ||
6723ab54 DM |
2004 | #endif |
2005 | ||
1da177e4 LT |
2006 | /* |
2007 | * Allocate a dst for local (unicast / anycast) address. | |
2008 | */ | |
2009 | ||
2010 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2011 | const struct in6_addr *addr, | |
2012 | int anycast) | |
2013 | { | |
c346dca1 | 2014 | struct net *net = dev_net(idev->dev); |
5c1e6aa3 DM |
2015 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
2016 | net->loopback_dev); | |
14deae41 | 2017 | struct neighbour *neigh; |
1da177e4 | 2018 | |
40385653 BG |
2019 | if (rt == NULL) { |
2020 | if (net_ratelimit()) | |
2021 | pr_warning("IPv6: Maximum number of routes reached," | |
2022 | " consider increasing route/max_size.\n"); | |
1da177e4 | 2023 | return ERR_PTR(-ENOMEM); |
40385653 | 2024 | } |
1da177e4 | 2025 | |
1da177e4 LT |
2026 | in6_dev_hold(idev); |
2027 | ||
d8d1f30b CG |
2028 | rt->dst.flags = DST_HOST; |
2029 | rt->dst.input = ip6_input; | |
2030 | rt->dst.output = ip6_output; | |
1da177e4 | 2031 | rt->rt6i_idev = idev; |
d8d1f30b | 2032 | rt->dst.obsolete = -1; |
1da177e4 LT |
2033 | |
2034 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2035 | if (anycast) |
2036 | rt->rt6i_flags |= RTF_ANYCAST; | |
2037 | else | |
1da177e4 | 2038 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
2039 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
2040 | if (IS_ERR(neigh)) { | |
d8d1f30b | 2041 | dst_free(&rt->dst); |
14deae41 | 2042 | |
29546a64 | 2043 | return ERR_CAST(neigh); |
1da177e4 | 2044 | } |
14deae41 | 2045 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
2046 | |
2047 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
2048 | rt->rt6i_dst.plen = 128; | |
5578689a | 2049 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2050 | |
d8d1f30b | 2051 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2052 | |
2053 | return rt; | |
2054 | } | |
2055 | ||
c3968a85 DW |
2056 | int ip6_route_get_saddr(struct net *net, |
2057 | struct rt6_info *rt, | |
b71d1d42 | 2058 | const struct in6_addr *daddr, |
c3968a85 DW |
2059 | unsigned int prefs, |
2060 | struct in6_addr *saddr) | |
2061 | { | |
2062 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2063 | int err = 0; | |
2064 | if (rt->rt6i_prefsrc.plen) | |
2065 | ipv6_addr_copy(saddr, &rt->rt6i_prefsrc.addr); | |
2066 | else | |
2067 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2068 | daddr, prefs, saddr); | |
2069 | return err; | |
2070 | } | |
2071 | ||
2072 | /* remove deleted ip from prefsrc entries */ | |
2073 | struct arg_dev_net_ip { | |
2074 | struct net_device *dev; | |
2075 | struct net *net; | |
2076 | struct in6_addr *addr; | |
2077 | }; | |
2078 | ||
2079 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2080 | { | |
2081 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2082 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2083 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2084 | ||
2085 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
2086 | rt != net->ipv6.ip6_null_entry && | |
2087 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2088 | /* remove prefsrc entry */ | |
2089 | rt->rt6i_prefsrc.plen = 0; | |
2090 | } | |
2091 | return 0; | |
2092 | } | |
2093 | ||
2094 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2095 | { | |
2096 | struct net *net = dev_net(ifp->idev->dev); | |
2097 | struct arg_dev_net_ip adni = { | |
2098 | .dev = ifp->idev->dev, | |
2099 | .net = net, | |
2100 | .addr = &ifp->addr, | |
2101 | }; | |
2102 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2103 | } | |
2104 | ||
8ed67789 DL |
2105 | struct arg_dev_net { |
2106 | struct net_device *dev; | |
2107 | struct net *net; | |
2108 | }; | |
2109 | ||
1da177e4 LT |
2110 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2111 | { | |
bc3ef660 | 2112 | const struct arg_dev_net *adn = arg; |
2113 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2114 | |
bc3ef660 | 2115 | if ((rt->rt6i_dev == dev || dev == NULL) && |
2116 | rt != adn->net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
2117 | RT6_TRACE("deleted by ifdown %p\n", rt); |
2118 | return -1; | |
2119 | } | |
2120 | return 0; | |
2121 | } | |
2122 | ||
f3db4851 | 2123 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2124 | { |
8ed67789 DL |
2125 | struct arg_dev_net adn = { |
2126 | .dev = dev, | |
2127 | .net = net, | |
2128 | }; | |
2129 | ||
2130 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2131 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2132 | } |
2133 | ||
2134 | struct rt6_mtu_change_arg | |
2135 | { | |
2136 | struct net_device *dev; | |
2137 | unsigned mtu; | |
2138 | }; | |
2139 | ||
2140 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2141 | { | |
2142 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2143 | struct inet6_dev *idev; | |
2144 | ||
2145 | /* In IPv6 pmtu discovery is not optional, | |
2146 | so that RTAX_MTU lock cannot disable it. | |
2147 | We still use this lock to block changes | |
2148 | caused by addrconf/ndisc. | |
2149 | */ | |
2150 | ||
2151 | idev = __in6_dev_get(arg->dev); | |
2152 | if (idev == NULL) | |
2153 | return 0; | |
2154 | ||
2155 | /* For administrative MTU increase, there is no way to discover | |
2156 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2157 | Since RFC 1981 doesn't include administrative MTU increase | |
2158 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2159 | */ | |
2160 | /* | |
2161 | If new MTU is less than route PMTU, this new MTU will be the | |
2162 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2163 | decreases; if new MTU is greater than route PMTU, and the | |
2164 | old MTU is the lowest MTU in the path, update the route PMTU | |
2165 | to reflect the increase. In this case if the other nodes' MTU | |
2166 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2167 | PMTU discouvery. | |
2168 | */ | |
2169 | if (rt->rt6i_dev == arg->dev && | |
d8d1f30b CG |
2170 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2171 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2172 | (dst_mtu(&rt->dst) < arg->mtu && | |
2173 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2174 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2175 | } |
1da177e4 LT |
2176 | return 0; |
2177 | } | |
2178 | ||
2179 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2180 | { | |
c71099ac TG |
2181 | struct rt6_mtu_change_arg arg = { |
2182 | .dev = dev, | |
2183 | .mtu = mtu, | |
2184 | }; | |
1da177e4 | 2185 | |
c346dca1 | 2186 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2187 | } |
2188 | ||
ef7c79ed | 2189 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2190 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2191 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2192 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2193 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2194 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2195 | }; | |
2196 | ||
2197 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2198 | struct fib6_config *cfg) | |
1da177e4 | 2199 | { |
86872cb5 TG |
2200 | struct rtmsg *rtm; |
2201 | struct nlattr *tb[RTA_MAX+1]; | |
2202 | int err; | |
1da177e4 | 2203 | |
86872cb5 TG |
2204 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2205 | if (err < 0) | |
2206 | goto errout; | |
1da177e4 | 2207 | |
86872cb5 TG |
2208 | err = -EINVAL; |
2209 | rtm = nlmsg_data(nlh); | |
2210 | memset(cfg, 0, sizeof(*cfg)); | |
2211 | ||
2212 | cfg->fc_table = rtm->rtm_table; | |
2213 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2214 | cfg->fc_src_len = rtm->rtm_src_len; | |
2215 | cfg->fc_flags = RTF_UP; | |
2216 | cfg->fc_protocol = rtm->rtm_protocol; | |
2217 | ||
2218 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2219 | cfg->fc_flags |= RTF_REJECT; | |
2220 | ||
ab79ad14 MŻ |
2221 | if (rtm->rtm_type == RTN_LOCAL) |
2222 | cfg->fc_flags |= RTF_LOCAL; | |
2223 | ||
86872cb5 TG |
2224 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2225 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2226 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2227 | |
2228 | if (tb[RTA_GATEWAY]) { | |
2229 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2230 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2231 | } |
86872cb5 TG |
2232 | |
2233 | if (tb[RTA_DST]) { | |
2234 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2235 | ||
2236 | if (nla_len(tb[RTA_DST]) < plen) | |
2237 | goto errout; | |
2238 | ||
2239 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2240 | } |
86872cb5 TG |
2241 | |
2242 | if (tb[RTA_SRC]) { | |
2243 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2244 | ||
2245 | if (nla_len(tb[RTA_SRC]) < plen) | |
2246 | goto errout; | |
2247 | ||
2248 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2249 | } |
86872cb5 | 2250 | |
c3968a85 DW |
2251 | if (tb[RTA_PREFSRC]) |
2252 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2253 | ||
86872cb5 TG |
2254 | if (tb[RTA_OIF]) |
2255 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2256 | ||
2257 | if (tb[RTA_PRIORITY]) | |
2258 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2259 | ||
2260 | if (tb[RTA_METRICS]) { | |
2261 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2262 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2263 | } |
86872cb5 TG |
2264 | |
2265 | if (tb[RTA_TABLE]) | |
2266 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2267 | ||
2268 | err = 0; | |
2269 | errout: | |
2270 | return err; | |
1da177e4 LT |
2271 | } |
2272 | ||
c127ea2c | 2273 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2274 | { |
86872cb5 TG |
2275 | struct fib6_config cfg; |
2276 | int err; | |
1da177e4 | 2277 | |
86872cb5 TG |
2278 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2279 | if (err < 0) | |
2280 | return err; | |
2281 | ||
2282 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2283 | } |
2284 | ||
c127ea2c | 2285 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2286 | { |
86872cb5 TG |
2287 | struct fib6_config cfg; |
2288 | int err; | |
1da177e4 | 2289 | |
86872cb5 TG |
2290 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2291 | if (err < 0) | |
2292 | return err; | |
2293 | ||
2294 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2295 | } |
2296 | ||
339bf98f TG |
2297 | static inline size_t rt6_nlmsg_size(void) |
2298 | { | |
2299 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2300 | + nla_total_size(16) /* RTA_SRC */ | |
2301 | + nla_total_size(16) /* RTA_DST */ | |
2302 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2303 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2304 | + nla_total_size(4) /* RTA_TABLE */ | |
2305 | + nla_total_size(4) /* RTA_IIF */ | |
2306 | + nla_total_size(4) /* RTA_OIF */ | |
2307 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2308 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2309 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2310 | } | |
2311 | ||
191cd582 BH |
2312 | static int rt6_fill_node(struct net *net, |
2313 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2314 | struct in6_addr *dst, struct in6_addr *src, |
2315 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2316 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2317 | { |
2318 | struct rtmsg *rtm; | |
2d7202bf | 2319 | struct nlmsghdr *nlh; |
e3703b3d | 2320 | long expires; |
9e762a4a | 2321 | u32 table; |
1da177e4 LT |
2322 | |
2323 | if (prefix) { /* user wants prefix routes only */ | |
2324 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2325 | /* success since this is not a prefix route */ | |
2326 | return 1; | |
2327 | } | |
2328 | } | |
2329 | ||
2d7202bf TG |
2330 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2331 | if (nlh == NULL) | |
26932566 | 2332 | return -EMSGSIZE; |
2d7202bf TG |
2333 | |
2334 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2335 | rtm->rtm_family = AF_INET6; |
2336 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2337 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2338 | rtm->rtm_tos = 0; | |
c71099ac | 2339 | if (rt->rt6i_table) |
9e762a4a | 2340 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2341 | else |
9e762a4a PM |
2342 | table = RT6_TABLE_UNSPEC; |
2343 | rtm->rtm_table = table; | |
2d7202bf | 2344 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2345 | if (rt->rt6i_flags&RTF_REJECT) |
2346 | rtm->rtm_type = RTN_UNREACHABLE; | |
ab79ad14 MŻ |
2347 | else if (rt->rt6i_flags&RTF_LOCAL) |
2348 | rtm->rtm_type = RTN_LOCAL; | |
1da177e4 LT |
2349 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) |
2350 | rtm->rtm_type = RTN_LOCAL; | |
2351 | else | |
2352 | rtm->rtm_type = RTN_UNICAST; | |
2353 | rtm->rtm_flags = 0; | |
2354 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2355 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2356 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2357 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2358 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2359 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2360 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2361 | rtm->rtm_protocol = RTPROT_RA; | |
2362 | ||
2363 | if (rt->rt6i_flags&RTF_CACHE) | |
2364 | rtm->rtm_flags |= RTM_F_CLONED; | |
2365 | ||
2366 | if (dst) { | |
2d7202bf | 2367 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2368 | rtm->rtm_dst_len = 128; |
1da177e4 | 2369 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2370 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2371 | #ifdef CONFIG_IPV6_SUBTREES |
2372 | if (src) { | |
2d7202bf | 2373 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2374 | rtm->rtm_src_len = 128; |
1da177e4 | 2375 | } else if (rtm->rtm_src_len) |
2d7202bf | 2376 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2377 | #endif |
7bc570c8 YH |
2378 | if (iif) { |
2379 | #ifdef CONFIG_IPV6_MROUTE | |
2380 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2381 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2382 | if (err <= 0) { |
2383 | if (!nowait) { | |
2384 | if (err == 0) | |
2385 | return 0; | |
2386 | goto nla_put_failure; | |
2387 | } else { | |
2388 | if (err == -EMSGSIZE) | |
2389 | goto nla_put_failure; | |
2390 | } | |
2391 | } | |
2392 | } else | |
2393 | #endif | |
2394 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2395 | } else if (dst) { | |
1da177e4 | 2396 | struct in6_addr saddr_buf; |
c3968a85 | 2397 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0) |
2d7202bf | 2398 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2399 | } |
2d7202bf | 2400 | |
c3968a85 DW |
2401 | if (rt->rt6i_prefsrc.plen) { |
2402 | struct in6_addr saddr_buf; | |
2403 | ipv6_addr_copy(&saddr_buf, &rt->rt6i_prefsrc.addr); | |
2404 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); | |
2405 | } | |
2406 | ||
defb3519 | 2407 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2408 | goto nla_put_failure; |
2409 | ||
d8d1f30b CG |
2410 | if (rt->dst.neighbour) |
2411 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->dst.neighbour->primary_key); | |
2d7202bf | 2412 | |
d8d1f30b | 2413 | if (rt->dst.dev) |
2d7202bf TG |
2414 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2415 | ||
2416 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2417 | |
36e3deae YH |
2418 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2419 | expires = 0; | |
2420 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2421 | expires = rt->rt6i_expires - jiffies; | |
2422 | else | |
2423 | expires = INT_MAX; | |
69cdf8f9 | 2424 | |
d8d1f30b CG |
2425 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2426 | expires, rt->dst.error) < 0) | |
e3703b3d | 2427 | goto nla_put_failure; |
2d7202bf TG |
2428 | |
2429 | return nlmsg_end(skb, nlh); | |
2430 | ||
2431 | nla_put_failure: | |
26932566 PM |
2432 | nlmsg_cancel(skb, nlh); |
2433 | return -EMSGSIZE; | |
1da177e4 LT |
2434 | } |
2435 | ||
1b43af54 | 2436 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2437 | { |
2438 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2439 | int prefix; | |
2440 | ||
2d7202bf TG |
2441 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2442 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2443 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2444 | } else | |
2445 | prefix = 0; | |
2446 | ||
191cd582 BH |
2447 | return rt6_fill_node(arg->net, |
2448 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2449 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2450 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2451 | } |
2452 | ||
c127ea2c | 2453 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2454 | { |
3b1e0a65 | 2455 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2456 | struct nlattr *tb[RTA_MAX+1]; |
2457 | struct rt6_info *rt; | |
1da177e4 | 2458 | struct sk_buff *skb; |
ab364a6f | 2459 | struct rtmsg *rtm; |
4c9483b2 | 2460 | struct flowi6 fl6; |
ab364a6f | 2461 | int err, iif = 0; |
1da177e4 | 2462 | |
ab364a6f TG |
2463 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2464 | if (err < 0) | |
2465 | goto errout; | |
1da177e4 | 2466 | |
ab364a6f | 2467 | err = -EINVAL; |
4c9483b2 | 2468 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2469 | |
ab364a6f TG |
2470 | if (tb[RTA_SRC]) { |
2471 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2472 | goto errout; | |
2473 | ||
4c9483b2 | 2474 | ipv6_addr_copy(&fl6.saddr, nla_data(tb[RTA_SRC])); |
ab364a6f TG |
2475 | } |
2476 | ||
2477 | if (tb[RTA_DST]) { | |
2478 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2479 | goto errout; | |
2480 | ||
4c9483b2 | 2481 | ipv6_addr_copy(&fl6.daddr, nla_data(tb[RTA_DST])); |
ab364a6f TG |
2482 | } |
2483 | ||
2484 | if (tb[RTA_IIF]) | |
2485 | iif = nla_get_u32(tb[RTA_IIF]); | |
2486 | ||
2487 | if (tb[RTA_OIF]) | |
4c9483b2 | 2488 | fl6.flowi6_oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2489 | |
2490 | if (iif) { | |
2491 | struct net_device *dev; | |
5578689a | 2492 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2493 | if (!dev) { |
2494 | err = -ENODEV; | |
ab364a6f | 2495 | goto errout; |
1da177e4 LT |
2496 | } |
2497 | } | |
2498 | ||
ab364a6f TG |
2499 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2500 | if (skb == NULL) { | |
2501 | err = -ENOBUFS; | |
2502 | goto errout; | |
2503 | } | |
1da177e4 | 2504 | |
ab364a6f TG |
2505 | /* Reserve room for dummy headers, this skb can pass |
2506 | through good chunk of routing engine. | |
2507 | */ | |
459a98ed | 2508 | skb_reset_mac_header(skb); |
ab364a6f | 2509 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2510 | |
4c9483b2 | 2511 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl6); |
d8d1f30b | 2512 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2513 | |
4c9483b2 | 2514 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2515 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2516 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2517 | if (err < 0) { |
ab364a6f TG |
2518 | kfree_skb(skb); |
2519 | goto errout; | |
1da177e4 LT |
2520 | } |
2521 | ||
5578689a | 2522 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2523 | errout: |
1da177e4 | 2524 | return err; |
1da177e4 LT |
2525 | } |
2526 | ||
86872cb5 | 2527 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2528 | { |
2529 | struct sk_buff *skb; | |
5578689a | 2530 | struct net *net = info->nl_net; |
528c4ceb DL |
2531 | u32 seq; |
2532 | int err; | |
2533 | ||
2534 | err = -ENOBUFS; | |
2535 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2536 | |
339bf98f | 2537 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2538 | if (skb == NULL) |
2539 | goto errout; | |
2540 | ||
191cd582 | 2541 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2542 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2543 | if (err < 0) { |
2544 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2545 | WARN_ON(err == -EMSGSIZE); | |
2546 | kfree_skb(skb); | |
2547 | goto errout; | |
2548 | } | |
1ce85fe4 PNA |
2549 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2550 | info->nlh, gfp_any()); | |
2551 | return; | |
21713ebc TG |
2552 | errout: |
2553 | if (err < 0) | |
5578689a | 2554 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2555 | } |
2556 | ||
8ed67789 DL |
2557 | static int ip6_route_dev_notify(struct notifier_block *this, |
2558 | unsigned long event, void *data) | |
2559 | { | |
2560 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2561 | struct net *net = dev_net(dev); |
8ed67789 DL |
2562 | |
2563 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2564 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2565 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2566 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2567 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2568 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2569 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2570 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2571 | #endif | |
2572 | } | |
2573 | ||
2574 | return NOTIFY_OK; | |
2575 | } | |
2576 | ||
1da177e4 LT |
2577 | /* |
2578 | * /proc | |
2579 | */ | |
2580 | ||
2581 | #ifdef CONFIG_PROC_FS | |
2582 | ||
1da177e4 LT |
2583 | struct rt6_proc_arg |
2584 | { | |
2585 | char *buffer; | |
2586 | int offset; | |
2587 | int length; | |
2588 | int skip; | |
2589 | int len; | |
2590 | }; | |
2591 | ||
2592 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2593 | { | |
33120b30 | 2594 | struct seq_file *m = p_arg; |
1da177e4 | 2595 | |
4b7a4274 | 2596 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2597 | |
2598 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2599 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2600 | #else |
33120b30 | 2601 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2602 | #endif |
2603 | ||
2604 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2605 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2606 | } else { |
33120b30 | 2607 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2608 | } |
33120b30 | 2609 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2610 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2611 | rt->dst.__use, rt->rt6i_flags, | |
33120b30 | 2612 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
1da177e4 LT |
2613 | return 0; |
2614 | } | |
2615 | ||
33120b30 | 2616 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2617 | { |
f3db4851 DL |
2618 | struct net *net = (struct net *)m->private; |
2619 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2620 | return 0; |
2621 | } | |
1da177e4 | 2622 | |
33120b30 AD |
2623 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2624 | { | |
de05c557 | 2625 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2626 | } |
2627 | ||
33120b30 AD |
2628 | static const struct file_operations ipv6_route_proc_fops = { |
2629 | .owner = THIS_MODULE, | |
2630 | .open = ipv6_route_open, | |
2631 | .read = seq_read, | |
2632 | .llseek = seq_lseek, | |
b6fcbdb4 | 2633 | .release = single_release_net, |
33120b30 AD |
2634 | }; |
2635 | ||
1da177e4 LT |
2636 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2637 | { | |
69ddb805 | 2638 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2639 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2640 | net->ipv6.rt6_stats->fib_nodes, |
2641 | net->ipv6.rt6_stats->fib_route_nodes, | |
2642 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2643 | net->ipv6.rt6_stats->fib_rt_entries, | |
2644 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2645 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2646 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2647 | |
2648 | return 0; | |
2649 | } | |
2650 | ||
2651 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2652 | { | |
de05c557 | 2653 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2654 | } |
2655 | ||
9a32144e | 2656 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2657 | .owner = THIS_MODULE, |
2658 | .open = rt6_stats_seq_open, | |
2659 | .read = seq_read, | |
2660 | .llseek = seq_lseek, | |
b6fcbdb4 | 2661 | .release = single_release_net, |
1da177e4 LT |
2662 | }; |
2663 | #endif /* CONFIG_PROC_FS */ | |
2664 | ||
2665 | #ifdef CONFIG_SYSCTL | |
2666 | ||
1da177e4 | 2667 | static |
8d65af78 | 2668 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2669 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2670 | { | |
c486da34 LAG |
2671 | struct net *net; |
2672 | int delay; | |
2673 | if (!write) | |
1da177e4 | 2674 | return -EINVAL; |
c486da34 LAG |
2675 | |
2676 | net = (struct net *)ctl->extra1; | |
2677 | delay = net->ipv6.sysctl.flush_delay; | |
2678 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2679 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2680 | return 0; | |
1da177e4 LT |
2681 | } |
2682 | ||
760f2d01 | 2683 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2684 | { |
1da177e4 | 2685 | .procname = "flush", |
4990509f | 2686 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2687 | .maxlen = sizeof(int), |
89c8b3a1 | 2688 | .mode = 0200, |
6d9f239a | 2689 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2690 | }, |
2691 | { | |
1da177e4 | 2692 | .procname = "gc_thresh", |
9a7ec3a9 | 2693 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2694 | .maxlen = sizeof(int), |
2695 | .mode = 0644, | |
6d9f239a | 2696 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2697 | }, |
2698 | { | |
1da177e4 | 2699 | .procname = "max_size", |
4990509f | 2700 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2701 | .maxlen = sizeof(int), |
2702 | .mode = 0644, | |
6d9f239a | 2703 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2704 | }, |
2705 | { | |
1da177e4 | 2706 | .procname = "gc_min_interval", |
4990509f | 2707 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2708 | .maxlen = sizeof(int), |
2709 | .mode = 0644, | |
6d9f239a | 2710 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2711 | }, |
2712 | { | |
1da177e4 | 2713 | .procname = "gc_timeout", |
4990509f | 2714 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2715 | .maxlen = sizeof(int), |
2716 | .mode = 0644, | |
6d9f239a | 2717 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2718 | }, |
2719 | { | |
1da177e4 | 2720 | .procname = "gc_interval", |
4990509f | 2721 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2722 | .maxlen = sizeof(int), |
2723 | .mode = 0644, | |
6d9f239a | 2724 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2725 | }, |
2726 | { | |
1da177e4 | 2727 | .procname = "gc_elasticity", |
4990509f | 2728 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2729 | .maxlen = sizeof(int), |
2730 | .mode = 0644, | |
f3d3f616 | 2731 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2732 | }, |
2733 | { | |
1da177e4 | 2734 | .procname = "mtu_expires", |
4990509f | 2735 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2736 | .maxlen = sizeof(int), |
2737 | .mode = 0644, | |
6d9f239a | 2738 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2739 | }, |
2740 | { | |
1da177e4 | 2741 | .procname = "min_adv_mss", |
4990509f | 2742 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2743 | .maxlen = sizeof(int), |
2744 | .mode = 0644, | |
f3d3f616 | 2745 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2746 | }, |
2747 | { | |
1da177e4 | 2748 | .procname = "gc_min_interval_ms", |
4990509f | 2749 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2750 | .maxlen = sizeof(int), |
2751 | .mode = 0644, | |
6d9f239a | 2752 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2753 | }, |
f8572d8f | 2754 | { } |
1da177e4 LT |
2755 | }; |
2756 | ||
2c8c1e72 | 2757 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2758 | { |
2759 | struct ctl_table *table; | |
2760 | ||
2761 | table = kmemdup(ipv6_route_table_template, | |
2762 | sizeof(ipv6_route_table_template), | |
2763 | GFP_KERNEL); | |
5ee09105 YH |
2764 | |
2765 | if (table) { | |
2766 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2767 | table[0].extra1 = net; |
86393e52 | 2768 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2769 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2770 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2771 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2772 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2773 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2774 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2775 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2776 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2777 | } |
2778 | ||
760f2d01 DL |
2779 | return table; |
2780 | } | |
1da177e4 LT |
2781 | #endif |
2782 | ||
2c8c1e72 | 2783 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2784 | { |
633d424b | 2785 | int ret = -ENOMEM; |
8ed67789 | 2786 | |
86393e52 AD |
2787 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2788 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2789 | |
fc66f95c ED |
2790 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2791 | goto out_ip6_dst_ops; | |
2792 | ||
8ed67789 DL |
2793 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2794 | sizeof(*net->ipv6.ip6_null_entry), | |
2795 | GFP_KERNEL); | |
2796 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2797 | goto out_ip6_dst_entries; |
d8d1f30b | 2798 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2799 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2800 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2801 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2802 | ip6_template_metrics, true); | |
8ed67789 DL |
2803 | |
2804 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2805 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2806 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2807 | GFP_KERNEL); | |
68fffc67 PZ |
2808 | if (!net->ipv6.ip6_prohibit_entry) |
2809 | goto out_ip6_null_entry; | |
d8d1f30b | 2810 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2811 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2812 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2813 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2814 | ip6_template_metrics, true); | |
8ed67789 DL |
2815 | |
2816 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2817 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2818 | GFP_KERNEL); | |
68fffc67 PZ |
2819 | if (!net->ipv6.ip6_blk_hole_entry) |
2820 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2821 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2822 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2823 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2824 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2825 | ip6_template_metrics, true); | |
8ed67789 DL |
2826 | #endif |
2827 | ||
b339a47c PZ |
2828 | net->ipv6.sysctl.flush_delay = 0; |
2829 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2830 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2831 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2832 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2833 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2834 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2835 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2836 | ||
cdb18761 DL |
2837 | #ifdef CONFIG_PROC_FS |
2838 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2839 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2840 | #endif | |
6891a346 BT |
2841 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2842 | ||
8ed67789 DL |
2843 | ret = 0; |
2844 | out: | |
2845 | return ret; | |
f2fc6a54 | 2846 | |
68fffc67 PZ |
2847 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2848 | out_ip6_prohibit_entry: | |
2849 | kfree(net->ipv6.ip6_prohibit_entry); | |
2850 | out_ip6_null_entry: | |
2851 | kfree(net->ipv6.ip6_null_entry); | |
2852 | #endif | |
fc66f95c ED |
2853 | out_ip6_dst_entries: |
2854 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2855 | out_ip6_dst_ops: |
f2fc6a54 | 2856 | goto out; |
cdb18761 DL |
2857 | } |
2858 | ||
2c8c1e72 | 2859 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2860 | { |
2861 | #ifdef CONFIG_PROC_FS | |
2862 | proc_net_remove(net, "ipv6_route"); | |
2863 | proc_net_remove(net, "rt6_stats"); | |
2864 | #endif | |
8ed67789 DL |
2865 | kfree(net->ipv6.ip6_null_entry); |
2866 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2867 | kfree(net->ipv6.ip6_prohibit_entry); | |
2868 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2869 | #endif | |
41bb78b4 | 2870 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2871 | } |
2872 | ||
2873 | static struct pernet_operations ip6_route_net_ops = { | |
2874 | .init = ip6_route_net_init, | |
2875 | .exit = ip6_route_net_exit, | |
2876 | }; | |
2877 | ||
8ed67789 DL |
2878 | static struct notifier_block ip6_route_dev_notifier = { |
2879 | .notifier_call = ip6_route_dev_notify, | |
2880 | .priority = 0, | |
2881 | }; | |
2882 | ||
433d49c3 | 2883 | int __init ip6_route_init(void) |
1da177e4 | 2884 | { |
433d49c3 DL |
2885 | int ret; |
2886 | ||
9a7ec3a9 DL |
2887 | ret = -ENOMEM; |
2888 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2889 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2890 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2891 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2892 | goto out; |
14e50e57 | 2893 | |
fc66f95c | 2894 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2895 | if (ret) |
bdb3289f | 2896 | goto out_kmem_cache; |
bdb3289f | 2897 | |
fc66f95c ED |
2898 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2899 | if (ret) | |
2900 | goto out_dst_entries; | |
2901 | ||
5dc121e9 AE |
2902 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2903 | ||
8ed67789 DL |
2904 | /* Registering of the loopback is done before this portion of code, |
2905 | * the loopback reference in rt6_info will not be taken, do it | |
2906 | * manually for init_net */ | |
d8d1f30b | 2907 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2908 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2909 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2910 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2911 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2912 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2913 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2914 | #endif | |
433d49c3 DL |
2915 | ret = fib6_init(); |
2916 | if (ret) | |
8ed67789 | 2917 | goto out_register_subsys; |
433d49c3 | 2918 | |
433d49c3 DL |
2919 | ret = xfrm6_init(); |
2920 | if (ret) | |
cdb18761 | 2921 | goto out_fib6_init; |
c35b7e72 | 2922 | |
433d49c3 DL |
2923 | ret = fib6_rules_init(); |
2924 | if (ret) | |
2925 | goto xfrm6_init; | |
7e5449c2 | 2926 | |
433d49c3 DL |
2927 | ret = -ENOBUFS; |
2928 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2929 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2930 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2931 | goto fib6_rules_init; | |
c127ea2c | 2932 | |
8ed67789 | 2933 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2934 | if (ret) |
2935 | goto fib6_rules_init; | |
8ed67789 | 2936 | |
433d49c3 DL |
2937 | out: |
2938 | return ret; | |
2939 | ||
2940 | fib6_rules_init: | |
433d49c3 DL |
2941 | fib6_rules_cleanup(); |
2942 | xfrm6_init: | |
433d49c3 | 2943 | xfrm6_fini(); |
433d49c3 | 2944 | out_fib6_init: |
433d49c3 | 2945 | fib6_gc_cleanup(); |
8ed67789 DL |
2946 | out_register_subsys: |
2947 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
2948 | out_dst_entries: |
2949 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 2950 | out_kmem_cache: |
f2fc6a54 | 2951 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2952 | goto out; |
1da177e4 LT |
2953 | } |
2954 | ||
2955 | void ip6_route_cleanup(void) | |
2956 | { | |
8ed67789 | 2957 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2958 | fib6_rules_cleanup(); |
1da177e4 | 2959 | xfrm6_fini(); |
1da177e4 | 2960 | fib6_gc_cleanup(); |
8ed67789 | 2961 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 2962 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 2963 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2964 | } |