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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> |
457c4cbc | 43 | #include <net/net_namespace.h> |
1da177e4 LT |
44 | #include <net/snmp.h> |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_fib.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/tcp.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/xfrm.h> | |
8d71740c | 54 | #include <net/netevent.h> |
21713ebc | 55 | #include <net/netlink.h> |
1da177e4 LT |
56 | |
57 | #include <asm/uaccess.h> | |
58 | ||
59 | #ifdef CONFIG_SYSCTL | |
60 | #include <linux/sysctl.h> | |
61 | #endif | |
62 | ||
63 | /* Set to 3 to get tracing. */ | |
64 | #define RT6_DEBUG 2 | |
65 | ||
66 | #if RT6_DEBUG >= 3 | |
67 | #define RDBG(x) printk x | |
68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
69 | #else | |
70 | #define RDBG(x) | |
71 | #define RT6_TRACE(x...) do { ; } while (0) | |
72 | #endif | |
73 | ||
519fbd87 | 74 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 75 | |
1da177e4 LT |
76 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
78 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
79 | static void ip6_dst_destroy(struct dst_entry *); | |
80 | static void ip6_dst_ifdown(struct dst_entry *, | |
81 | struct net_device *dev, int how); | |
569d3645 | 82 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
83 | |
84 | static int ip6_pkt_discard(struct sk_buff *skb); | |
85 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
86 | static void ip6_link_failure(struct sk_buff *skb); | |
87 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
88 | ||
70ceb4f5 | 89 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
90 | static struct rt6_info *rt6_add_route_info(struct net *net, |
91 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
92 | struct in6_addr *gwaddr, int ifindex, |
93 | unsigned pref); | |
efa2cea0 DL |
94 | static struct rt6_info *rt6_get_route_info(struct net *net, |
95 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
96 | struct in6_addr *gwaddr, int ifindex); |
97 | #endif | |
98 | ||
9a7ec3a9 | 99 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 LT |
100 | .family = AF_INET6, |
101 | .protocol = __constant_htons(ETH_P_IPV6), | |
102 | .gc = ip6_dst_gc, | |
103 | .gc_thresh = 1024, | |
104 | .check = ip6_dst_check, | |
105 | .destroy = ip6_dst_destroy, | |
106 | .ifdown = ip6_dst_ifdown, | |
107 | .negative_advice = ip6_negative_advice, | |
108 | .link_failure = ip6_link_failure, | |
109 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 110 | .local_out = __ip6_local_out, |
1da177e4 | 111 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 112 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
113 | }; |
114 | ||
14e50e57 DM |
115 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
116 | { | |
117 | } | |
118 | ||
119 | static struct dst_ops ip6_dst_blackhole_ops = { | |
120 | .family = AF_INET6, | |
121 | .protocol = __constant_htons(ETH_P_IPV6), | |
122 | .destroy = ip6_dst_destroy, | |
123 | .check = ip6_dst_check, | |
124 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
125 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 126 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
127 | }; |
128 | ||
bdb3289f | 129 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
130 | .u = { |
131 | .dst = { | |
132 | .__refcnt = ATOMIC_INIT(1), | |
133 | .__use = 1, | |
1da177e4 LT |
134 | .obsolete = -1, |
135 | .error = -ENETUNREACH, | |
136 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
137 | .input = ip6_pkt_discard, | |
138 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
139 | } |
140 | }, | |
141 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
142 | .rt6i_metric = ~(u32) 0, | |
143 | .rt6i_ref = ATOMIC_INIT(1), | |
144 | }; | |
145 | ||
101367c2 TG |
146 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
147 | ||
6723ab54 DM |
148 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
149 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 150 | |
280a34c8 | 151 | static struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
152 | .u = { |
153 | .dst = { | |
154 | .__refcnt = ATOMIC_INIT(1), | |
155 | .__use = 1, | |
101367c2 TG |
156 | .obsolete = -1, |
157 | .error = -EACCES, | |
158 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
159 | .input = ip6_pkt_prohibit, |
160 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
161 | } |
162 | }, | |
163 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
164 | .rt6i_metric = ~(u32) 0, | |
165 | .rt6i_ref = ATOMIC_INIT(1), | |
166 | }; | |
167 | ||
bdb3289f | 168 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
169 | .u = { |
170 | .dst = { | |
171 | .__refcnt = ATOMIC_INIT(1), | |
172 | .__use = 1, | |
101367c2 TG |
173 | .obsolete = -1, |
174 | .error = -EINVAL, | |
175 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
176 | .input = dst_discard, |
177 | .output = dst_discard, | |
101367c2 TG |
178 | } |
179 | }, | |
180 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
181 | .rt6i_metric = ~(u32) 0, | |
182 | .rt6i_ref = ATOMIC_INIT(1), | |
183 | }; | |
184 | ||
185 | #endif | |
186 | ||
1da177e4 | 187 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 188 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 189 | { |
f2fc6a54 | 190 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
191 | } |
192 | ||
193 | static void ip6_dst_destroy(struct dst_entry *dst) | |
194 | { | |
195 | struct rt6_info *rt = (struct rt6_info *)dst; | |
196 | struct inet6_dev *idev = rt->rt6i_idev; | |
197 | ||
198 | if (idev != NULL) { | |
199 | rt->rt6i_idev = NULL; | |
200 | in6_dev_put(idev); | |
1ab1457c | 201 | } |
1da177e4 LT |
202 | } |
203 | ||
204 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
205 | int how) | |
206 | { | |
207 | struct rt6_info *rt = (struct rt6_info *)dst; | |
208 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 209 | struct net_device *loopback_dev = |
c346dca1 | 210 | dev_net(dev)->loopback_dev; |
1da177e4 | 211 | |
5a3e55d6 DL |
212 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
213 | struct inet6_dev *loopback_idev = | |
214 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
215 | if (loopback_idev != NULL) { |
216 | rt->rt6i_idev = loopback_idev; | |
217 | in6_dev_put(idev); | |
218 | } | |
219 | } | |
220 | } | |
221 | ||
222 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
223 | { | |
224 | return (rt->rt6i_flags & RTF_EXPIRES && | |
225 | time_after(jiffies, rt->rt6i_expires)); | |
226 | } | |
227 | ||
c71099ac TG |
228 | static inline int rt6_need_strict(struct in6_addr *daddr) |
229 | { | |
230 | return (ipv6_addr_type(daddr) & | |
231 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
232 | } | |
233 | ||
1da177e4 | 234 | /* |
c71099ac | 235 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
236 | */ |
237 | ||
8ed67789 DL |
238 | static inline struct rt6_info *rt6_device_match(struct net *net, |
239 | struct rt6_info *rt, | |
1da177e4 | 240 | int oif, |
d420895e | 241 | int flags) |
1da177e4 LT |
242 | { |
243 | struct rt6_info *local = NULL; | |
244 | struct rt6_info *sprt; | |
245 | ||
246 | if (oif) { | |
7cc48263 | 247 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
248 | struct net_device *dev = sprt->rt6i_dev; |
249 | if (dev->ifindex == oif) | |
250 | return sprt; | |
251 | if (dev->flags & IFF_LOOPBACK) { | |
252 | if (sprt->rt6i_idev == NULL || | |
253 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 254 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 255 | continue; |
1ab1457c | 256 | if (local && (!oif || |
1da177e4 LT |
257 | local->rt6i_idev->dev->ifindex == oif)) |
258 | continue; | |
259 | } | |
260 | local = sprt; | |
261 | } | |
262 | } | |
263 | ||
264 | if (local) | |
265 | return local; | |
266 | ||
d420895e | 267 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 268 | return net->ipv6.ip6_null_entry; |
1da177e4 LT |
269 | } |
270 | return rt; | |
271 | } | |
272 | ||
27097255 YH |
273 | #ifdef CONFIG_IPV6_ROUTER_PREF |
274 | static void rt6_probe(struct rt6_info *rt) | |
275 | { | |
276 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
277 | /* | |
278 | * Okay, this does not seem to be appropriate | |
279 | * for now, however, we need to check if it | |
280 | * is really so; aka Router Reachability Probing. | |
281 | * | |
282 | * Router Reachability Probe MUST be rate-limited | |
283 | * to no more than one per minute. | |
284 | */ | |
285 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
286 | return; | |
287 | read_lock_bh(&neigh->lock); | |
288 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 289 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
290 | struct in6_addr mcaddr; |
291 | struct in6_addr *target; | |
292 | ||
293 | neigh->updated = jiffies; | |
294 | read_unlock_bh(&neigh->lock); | |
295 | ||
296 | target = (struct in6_addr *)&neigh->primary_key; | |
297 | addrconf_addr_solict_mult(target, &mcaddr); | |
298 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
299 | } else | |
300 | read_unlock_bh(&neigh->lock); | |
301 | } | |
302 | #else | |
303 | static inline void rt6_probe(struct rt6_info *rt) | |
304 | { | |
305 | return; | |
306 | } | |
307 | #endif | |
308 | ||
1da177e4 | 309 | /* |
554cfb7e | 310 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 311 | */ |
b6f99a21 | 312 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
313 | { |
314 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 315 | if (!oif || dev->ifindex == oif) |
554cfb7e | 316 | return 2; |
161980f4 DM |
317 | if ((dev->flags & IFF_LOOPBACK) && |
318 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
319 | return 1; | |
320 | return 0; | |
554cfb7e | 321 | } |
1da177e4 | 322 | |
b6f99a21 | 323 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 324 | { |
554cfb7e | 325 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 326 | int m; |
4d0c5911 YH |
327 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
328 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
329 | m = 1; | |
330 | else if (neigh) { | |
554cfb7e YH |
331 | read_lock_bh(&neigh->lock); |
332 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 333 | m = 2; |
398bcbeb YH |
334 | #ifdef CONFIG_IPV6_ROUTER_PREF |
335 | else if (neigh->nud_state & NUD_FAILED) | |
336 | m = 0; | |
337 | #endif | |
338 | else | |
ea73ee23 | 339 | m = 1; |
554cfb7e | 340 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
341 | } else |
342 | m = 0; | |
554cfb7e | 343 | return m; |
1da177e4 LT |
344 | } |
345 | ||
554cfb7e YH |
346 | static int rt6_score_route(struct rt6_info *rt, int oif, |
347 | int strict) | |
1da177e4 | 348 | { |
4d0c5911 | 349 | int m, n; |
1ab1457c | 350 | |
4d0c5911 | 351 | m = rt6_check_dev(rt, oif); |
77d16f45 | 352 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 353 | return -1; |
ebacaaa0 YH |
354 | #ifdef CONFIG_IPV6_ROUTER_PREF |
355 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
356 | #endif | |
4d0c5911 | 357 | n = rt6_check_neigh(rt); |
557e92ef | 358 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
359 | return -1; |
360 | return m; | |
361 | } | |
362 | ||
f11e6659 DM |
363 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
364 | int *mpri, struct rt6_info *match) | |
554cfb7e | 365 | { |
f11e6659 DM |
366 | int m; |
367 | ||
368 | if (rt6_check_expired(rt)) | |
369 | goto out; | |
370 | ||
371 | m = rt6_score_route(rt, oif, strict); | |
372 | if (m < 0) | |
373 | goto out; | |
374 | ||
375 | if (m > *mpri) { | |
376 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
377 | rt6_probe(match); | |
378 | *mpri = m; | |
379 | match = rt; | |
380 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
381 | rt6_probe(rt); | |
382 | } | |
383 | ||
384 | out: | |
385 | return match; | |
386 | } | |
387 | ||
388 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
389 | struct rt6_info *rr_head, | |
390 | u32 metric, int oif, int strict) | |
391 | { | |
392 | struct rt6_info *rt, *match; | |
554cfb7e | 393 | int mpri = -1; |
1da177e4 | 394 | |
f11e6659 DM |
395 | match = NULL; |
396 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
397 | rt = rt->u.dst.rt6_next) | |
398 | match = find_match(rt, oif, strict, &mpri, match); | |
399 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
400 | rt = rt->u.dst.rt6_next) | |
401 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 402 | |
f11e6659 DM |
403 | return match; |
404 | } | |
1da177e4 | 405 | |
f11e6659 DM |
406 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
407 | { | |
408 | struct rt6_info *match, *rt0; | |
8ed67789 | 409 | struct net *net; |
1da177e4 | 410 | |
f11e6659 | 411 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 412 | __func__, fn->leaf, oif); |
554cfb7e | 413 | |
f11e6659 DM |
414 | rt0 = fn->rr_ptr; |
415 | if (!rt0) | |
416 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 417 | |
f11e6659 | 418 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 419 | |
554cfb7e | 420 | if (!match && |
f11e6659 DM |
421 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
422 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
423 | ||
554cfb7e | 424 | /* no entries matched; do round-robin */ |
f11e6659 DM |
425 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
426 | next = fn->leaf; | |
427 | ||
428 | if (next != rt0) | |
429 | fn->rr_ptr = next; | |
1da177e4 | 430 | } |
1da177e4 | 431 | |
f11e6659 | 432 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 433 | __func__, match); |
1da177e4 | 434 | |
c346dca1 | 435 | net = dev_net(rt0->rt6i_dev); |
8ed67789 | 436 | return (match ? match : net->ipv6.ip6_null_entry); |
1da177e4 LT |
437 | } |
438 | ||
70ceb4f5 YH |
439 | #ifdef CONFIG_IPV6_ROUTE_INFO |
440 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
441 | struct in6_addr *gwaddr) | |
442 | { | |
c346dca1 | 443 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
444 | struct route_info *rinfo = (struct route_info *) opt; |
445 | struct in6_addr prefix_buf, *prefix; | |
446 | unsigned int pref; | |
4bed72e4 | 447 | unsigned long lifetime; |
70ceb4f5 YH |
448 | struct rt6_info *rt; |
449 | ||
450 | if (len < sizeof(struct route_info)) { | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
454 | /* Sanity check for prefix_len and length */ | |
455 | if (rinfo->length > 3) { | |
456 | return -EINVAL; | |
457 | } else if (rinfo->prefix_len > 128) { | |
458 | return -EINVAL; | |
459 | } else if (rinfo->prefix_len > 64) { | |
460 | if (rinfo->length < 2) { | |
461 | return -EINVAL; | |
462 | } | |
463 | } else if (rinfo->prefix_len > 0) { | |
464 | if (rinfo->length < 1) { | |
465 | return -EINVAL; | |
466 | } | |
467 | } | |
468 | ||
469 | pref = rinfo->route_pref; | |
470 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
471 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
472 | ||
4bed72e4 | 473 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
474 | |
475 | if (rinfo->length == 3) | |
476 | prefix = (struct in6_addr *)rinfo->prefix; | |
477 | else { | |
478 | /* this function is safe */ | |
479 | ipv6_addr_prefix(&prefix_buf, | |
480 | (struct in6_addr *)rinfo->prefix, | |
481 | rinfo->prefix_len); | |
482 | prefix = &prefix_buf; | |
483 | } | |
484 | ||
efa2cea0 DL |
485 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
486 | dev->ifindex); | |
70ceb4f5 YH |
487 | |
488 | if (rt && !lifetime) { | |
e0a1ad73 | 489 | ip6_del_rt(rt); |
70ceb4f5 YH |
490 | rt = NULL; |
491 | } | |
492 | ||
493 | if (!rt && lifetime) | |
efa2cea0 | 494 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
495 | pref); |
496 | else if (rt) | |
497 | rt->rt6i_flags = RTF_ROUTEINFO | | |
498 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
499 | ||
500 | if (rt) { | |
4bed72e4 | 501 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
502 | rt->rt6i_flags &= ~RTF_EXPIRES; |
503 | } else { | |
504 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
505 | rt->rt6i_flags |= RTF_EXPIRES; | |
506 | } | |
507 | dst_release(&rt->u.dst); | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | #endif | |
512 | ||
8ed67789 | 513 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 514 | do { \ |
8ed67789 | 515 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 516 | struct fib6_node *pn; \ |
e0eda7bb | 517 | while (1) { \ |
982f56f3 YH |
518 | if (fn->fn_flags & RTN_TL_ROOT) \ |
519 | goto out; \ | |
520 | pn = fn->parent; \ | |
521 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 522 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
523 | else \ |
524 | fn = pn; \ | |
525 | if (fn->fn_flags & RTN_RTINFO) \ | |
526 | goto restart; \ | |
c71099ac | 527 | } \ |
c71099ac | 528 | } \ |
982f56f3 | 529 | } while(0) |
c71099ac | 530 | |
8ed67789 DL |
531 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
532 | struct fib6_table *table, | |
c71099ac | 533 | struct flowi *fl, int flags) |
1da177e4 LT |
534 | { |
535 | struct fib6_node *fn; | |
536 | struct rt6_info *rt; | |
537 | ||
c71099ac TG |
538 | read_lock_bh(&table->tb6_lock); |
539 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
540 | restart: | |
541 | rt = fn->leaf; | |
8ed67789 DL |
542 | rt = rt6_device_match(net, rt, fl->oif, flags); |
543 | BACKTRACK(net, &fl->fl6_src); | |
c71099ac | 544 | out: |
03f49f34 | 545 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 546 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
547 | return rt; |
548 | ||
549 | } | |
550 | ||
9acd9f3a YH |
551 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
552 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
553 | { |
554 | struct flowi fl = { | |
555 | .oif = oif, | |
556 | .nl_u = { | |
557 | .ip6_u = { | |
558 | .daddr = *daddr, | |
c71099ac TG |
559 | }, |
560 | }, | |
561 | }; | |
562 | struct dst_entry *dst; | |
77d16f45 | 563 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 564 | |
adaa70bb TG |
565 | if (saddr) { |
566 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
567 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
568 | } | |
569 | ||
606a2b48 | 570 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
571 | if (dst->error == 0) |
572 | return (struct rt6_info *) dst; | |
573 | ||
574 | dst_release(dst); | |
575 | ||
1da177e4 LT |
576 | return NULL; |
577 | } | |
578 | ||
7159039a YH |
579 | EXPORT_SYMBOL(rt6_lookup); |
580 | ||
c71099ac | 581 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
582 | It takes new route entry, the addition fails by any reason the |
583 | route is freed. In any case, if caller does not hold it, it may | |
584 | be destroyed. | |
585 | */ | |
586 | ||
86872cb5 | 587 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
588 | { |
589 | int err; | |
c71099ac | 590 | struct fib6_table *table; |
1da177e4 | 591 | |
c71099ac TG |
592 | table = rt->rt6i_table; |
593 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 594 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 595 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
596 | |
597 | return err; | |
598 | } | |
599 | ||
40e22e8f TG |
600 | int ip6_ins_rt(struct rt6_info *rt) |
601 | { | |
4d1169c1 | 602 | struct nl_info info = { |
c346dca1 | 603 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 604 | }; |
528c4ceb | 605 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
606 | } |
607 | ||
95a9a5ba YH |
608 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
609 | struct in6_addr *saddr) | |
1da177e4 | 610 | { |
1da177e4 LT |
611 | struct rt6_info *rt; |
612 | ||
613 | /* | |
614 | * Clone the route. | |
615 | */ | |
616 | ||
617 | rt = ip6_rt_copy(ort); | |
618 | ||
619 | if (rt) { | |
58c4fb86 YH |
620 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
621 | if (rt->rt6i_dst.plen != 128 && | |
622 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
623 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 624 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 625 | } |
1da177e4 | 626 | |
58c4fb86 | 627 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
628 | rt->rt6i_dst.plen = 128; |
629 | rt->rt6i_flags |= RTF_CACHE; | |
630 | rt->u.dst.flags |= DST_HOST; | |
631 | ||
632 | #ifdef CONFIG_IPV6_SUBTREES | |
633 | if (rt->rt6i_src.plen && saddr) { | |
634 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
635 | rt->rt6i_src.plen = 128; | |
636 | } | |
637 | #endif | |
638 | ||
639 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
640 | ||
95a9a5ba | 641 | } |
1da177e4 | 642 | |
95a9a5ba YH |
643 | return rt; |
644 | } | |
1da177e4 | 645 | |
299d9939 YH |
646 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
647 | { | |
648 | struct rt6_info *rt = ip6_rt_copy(ort); | |
649 | if (rt) { | |
650 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
651 | rt->rt6i_dst.plen = 128; | |
652 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
653 | rt->u.dst.flags |= DST_HOST; |
654 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
655 | } | |
656 | return rt; | |
657 | } | |
658 | ||
8ed67789 DL |
659 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
660 | struct flowi *fl, int flags) | |
1da177e4 LT |
661 | { |
662 | struct fib6_node *fn; | |
519fbd87 | 663 | struct rt6_info *rt, *nrt; |
c71099ac | 664 | int strict = 0; |
1da177e4 | 665 | int attempts = 3; |
519fbd87 | 666 | int err; |
ea659e07 | 667 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 668 | |
77d16f45 | 669 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
670 | |
671 | relookup: | |
c71099ac | 672 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 673 | |
8238dd06 | 674 | restart_2: |
c71099ac | 675 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
676 | |
677 | restart: | |
4acad72d | 678 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
679 | |
680 | BACKTRACK(net, &fl->fl6_src); | |
681 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 682 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 683 | goto out; |
1da177e4 | 684 | |
fb9de91e | 685 | dst_hold(&rt->u.dst); |
c71099ac | 686 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 687 | |
519fbd87 | 688 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 689 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
690 | else { |
691 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 692 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
693 | #else |
694 | goto out2; | |
695 | #endif | |
696 | } | |
e40cf353 | 697 | |
519fbd87 | 698 | dst_release(&rt->u.dst); |
8ed67789 | 699 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 700 | |
519fbd87 YH |
701 | dst_hold(&rt->u.dst); |
702 | if (nrt) { | |
40e22e8f | 703 | err = ip6_ins_rt(nrt); |
519fbd87 | 704 | if (!err) |
1da177e4 | 705 | goto out2; |
1da177e4 | 706 | } |
1da177e4 | 707 | |
519fbd87 YH |
708 | if (--attempts <= 0) |
709 | goto out2; | |
710 | ||
711 | /* | |
c71099ac | 712 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
713 | * released someone could insert this route. Relookup. |
714 | */ | |
715 | dst_release(&rt->u.dst); | |
716 | goto relookup; | |
717 | ||
718 | out: | |
8238dd06 YH |
719 | if (reachable) { |
720 | reachable = 0; | |
721 | goto restart_2; | |
722 | } | |
519fbd87 | 723 | dst_hold(&rt->u.dst); |
c71099ac | 724 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
725 | out2: |
726 | rt->u.dst.lastuse = jiffies; | |
727 | rt->u.dst.__use++; | |
c71099ac TG |
728 | |
729 | return rt; | |
1da177e4 LT |
730 | } |
731 | ||
8ed67789 | 732 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
733 | struct flowi *fl, int flags) |
734 | { | |
8ed67789 | 735 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
736 | } |
737 | ||
c71099ac TG |
738 | void ip6_route_input(struct sk_buff *skb) |
739 | { | |
0660e03f | 740 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 741 | struct net *net = dev_net(skb->dev); |
adaa70bb | 742 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
743 | struct flowi fl = { |
744 | .iif = skb->dev->ifindex, | |
745 | .nl_u = { | |
746 | .ip6_u = { | |
747 | .daddr = iph->daddr, | |
748 | .saddr = iph->saddr, | |
90bcaf7b | 749 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
750 | }, |
751 | }, | |
1ab1457c | 752 | .mark = skb->mark, |
c71099ac TG |
753 | .proto = iph->nexthdr, |
754 | }; | |
adaa70bb TG |
755 | |
756 | if (rt6_need_strict(&iph->daddr)) | |
757 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 758 | |
5578689a | 759 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
760 | } |
761 | ||
8ed67789 | 762 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 763 | struct flowi *fl, int flags) |
1da177e4 | 764 | { |
8ed67789 | 765 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
766 | } |
767 | ||
4591db4f DL |
768 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
769 | struct flowi *fl) | |
c71099ac TG |
770 | { |
771 | int flags = 0; | |
772 | ||
773 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 774 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 775 | |
adaa70bb TG |
776 | if (!ipv6_addr_any(&fl->fl6_src)) |
777 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
7cbca67c YH |
778 | else if (sk) { |
779 | unsigned int prefs = inet6_sk(sk)->srcprefs; | |
780 | if (prefs & IPV6_PREFER_SRC_TMP) | |
781 | flags |= RT6_LOOKUP_F_SRCPREF_TMP; | |
782 | if (prefs & IPV6_PREFER_SRC_PUBLIC) | |
783 | flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC; | |
784 | if (prefs & IPV6_PREFER_SRC_COA) | |
785 | flags |= RT6_LOOKUP_F_SRCPREF_COA; | |
786 | } | |
adaa70bb | 787 | |
4591db4f | 788 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
789 | } |
790 | ||
7159039a | 791 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 792 | |
14e50e57 DM |
793 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
794 | { | |
795 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
796 | struct rt6_info *rt = (struct rt6_info *) | |
797 | dst_alloc(&ip6_dst_blackhole_ops); | |
798 | struct dst_entry *new = NULL; | |
799 | ||
800 | if (rt) { | |
801 | new = &rt->u.dst; | |
802 | ||
803 | atomic_set(&new->__refcnt, 1); | |
804 | new->__use = 1; | |
352e512c HX |
805 | new->input = dst_discard; |
806 | new->output = dst_discard; | |
14e50e57 DM |
807 | |
808 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
809 | new->dev = ort->u.dst.dev; | |
810 | if (new->dev) | |
811 | dev_hold(new->dev); | |
812 | rt->rt6i_idev = ort->rt6i_idev; | |
813 | if (rt->rt6i_idev) | |
814 | in6_dev_hold(rt->rt6i_idev); | |
815 | rt->rt6i_expires = 0; | |
816 | ||
817 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
818 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
819 | rt->rt6i_metric = 0; | |
820 | ||
821 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
822 | #ifdef CONFIG_IPV6_SUBTREES | |
823 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
824 | #endif | |
825 | ||
826 | dst_free(new); | |
827 | } | |
828 | ||
829 | dst_release(*dstp); | |
830 | *dstp = new; | |
831 | return (new ? 0 : -ENOMEM); | |
832 | } | |
833 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
834 | ||
1da177e4 LT |
835 | /* |
836 | * Destination cache support functions | |
837 | */ | |
838 | ||
839 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
840 | { | |
841 | struct rt6_info *rt; | |
842 | ||
843 | rt = (struct rt6_info *) dst; | |
844 | ||
845 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
846 | return dst; | |
847 | ||
848 | return NULL; | |
849 | } | |
850 | ||
851 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
852 | { | |
853 | struct rt6_info *rt = (struct rt6_info *) dst; | |
854 | ||
855 | if (rt) { | |
856 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 857 | ip6_del_rt(rt); |
1da177e4 LT |
858 | else |
859 | dst_release(dst); | |
860 | } | |
861 | return NULL; | |
862 | } | |
863 | ||
864 | static void ip6_link_failure(struct sk_buff *skb) | |
865 | { | |
866 | struct rt6_info *rt; | |
867 | ||
868 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
869 | ||
870 | rt = (struct rt6_info *) skb->dst; | |
871 | if (rt) { | |
872 | if (rt->rt6i_flags&RTF_CACHE) { | |
873 | dst_set_expires(&rt->u.dst, 0); | |
874 | rt->rt6i_flags |= RTF_EXPIRES; | |
875 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
876 | rt->rt6i_node->fn_sernum = -1; | |
877 | } | |
878 | } | |
879 | ||
880 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
881 | { | |
882 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
883 | ||
884 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
885 | rt6->rt6i_flags |= RTF_MODIFIED; | |
886 | if (mtu < IPV6_MIN_MTU) { | |
887 | mtu = IPV6_MIN_MTU; | |
888 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
889 | } | |
890 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 891 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
892 | } |
893 | } | |
894 | ||
1da177e4 LT |
895 | static int ipv6_get_mtu(struct net_device *dev); |
896 | ||
5578689a | 897 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
898 | { |
899 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
900 | ||
5578689a DL |
901 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
902 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
903 | |
904 | /* | |
1ab1457c YH |
905 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
906 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
907 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
908 | * rely only on pmtu discovery" |
909 | */ | |
910 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
911 | mtu = IPV6_MAXPLEN; | |
912 | return mtu; | |
913 | } | |
914 | ||
3b00944c YH |
915 | static struct dst_entry *icmp6_dst_gc_list; |
916 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 917 | |
3b00944c | 918 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 919 | struct neighbour *neigh, |
9acd9f3a | 920 | const struct in6_addr *addr) |
1da177e4 LT |
921 | { |
922 | struct rt6_info *rt; | |
923 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 924 | struct net *net = dev_net(dev); |
1da177e4 LT |
925 | |
926 | if (unlikely(idev == NULL)) | |
927 | return NULL; | |
928 | ||
f2fc6a54 | 929 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
930 | if (unlikely(rt == NULL)) { |
931 | in6_dev_put(idev); | |
932 | goto out; | |
933 | } | |
934 | ||
935 | dev_hold(dev); | |
936 | if (neigh) | |
937 | neigh_hold(neigh); | |
938 | else | |
939 | neigh = ndisc_get_neigh(dev, addr); | |
940 | ||
941 | rt->rt6i_dev = dev; | |
942 | rt->rt6i_idev = idev; | |
943 | rt->rt6i_nexthop = neigh; | |
944 | atomic_set(&rt->u.dst.__refcnt, 1); | |
945 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
946 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 947 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 948 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
949 | |
950 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
951 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
952 | ? DST_HOST | |
1da177e4 LT |
953 | : 0; |
954 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
955 | rt->rt6i_dst.plen = 128; | |
956 | #endif | |
957 | ||
3b00944c YH |
958 | spin_lock_bh(&icmp6_dst_lock); |
959 | rt->u.dst.next = icmp6_dst_gc_list; | |
960 | icmp6_dst_gc_list = &rt->u.dst; | |
961 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 962 | |
5578689a | 963 | fib6_force_start_gc(net); |
1da177e4 LT |
964 | |
965 | out: | |
40aa7b90 | 966 | return &rt->u.dst; |
1da177e4 LT |
967 | } |
968 | ||
3b00944c | 969 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
970 | { |
971 | struct dst_entry *dst, *next, **pprev; | |
972 | int freed; | |
973 | ||
974 | next = NULL; | |
1ab1457c | 975 | freed = 0; |
5d0bbeeb | 976 | |
3b00944c YH |
977 | spin_lock_bh(&icmp6_dst_lock); |
978 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 979 | |
1da177e4 LT |
980 | while ((dst = *pprev) != NULL) { |
981 | if (!atomic_read(&dst->__refcnt)) { | |
982 | *pprev = dst->next; | |
983 | dst_free(dst); | |
984 | freed++; | |
985 | } else { | |
986 | pprev = &dst->next; | |
987 | (*more)++; | |
988 | } | |
989 | } | |
990 | ||
3b00944c | 991 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 992 | |
1da177e4 LT |
993 | return freed; |
994 | } | |
995 | ||
569d3645 | 996 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 997 | { |
1da177e4 | 998 | unsigned long now = jiffies; |
7019b78e DL |
999 | struct net *net = ops->dst_net; |
1000 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
1001 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1002 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1003 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1004 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1005 | ||
1006 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1007 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1008 | goto out; |
1009 | ||
6891a346 BT |
1010 | net->ipv6.ip6_rt_gc_expire++; |
1011 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1012 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1013 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1014 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1015 | out: |
7019b78e DL |
1016 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1017 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1021 | but results in cleaner routing tables. | |
1022 | ||
1023 | Remove it only when all the things will work! | |
1024 | */ | |
1025 | ||
1026 | static int ipv6_get_mtu(struct net_device *dev) | |
1027 | { | |
1028 | int mtu = IPV6_MIN_MTU; | |
1029 | struct inet6_dev *idev; | |
1030 | ||
1031 | idev = in6_dev_get(dev); | |
1032 | if (idev) { | |
1033 | mtu = idev->cnf.mtu6; | |
1034 | in6_dev_put(idev); | |
1035 | } | |
1036 | return mtu; | |
1037 | } | |
1038 | ||
6b75d090 | 1039 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1040 | { |
6b75d090 YH |
1041 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1042 | if (hoplimit < 0) { | |
1043 | struct net_device *dev = dst->dev; | |
1044 | struct inet6_dev *idev = in6_dev_get(dev); | |
1045 | if (idev) { | |
1046 | hoplimit = idev->cnf.hop_limit; | |
1047 | in6_dev_put(idev); | |
1048 | } else | |
1049 | hoplimit = ipv6_devconf.hop_limit; | |
1da177e4 LT |
1050 | } |
1051 | return hoplimit; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * | |
1056 | */ | |
1057 | ||
86872cb5 | 1058 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1059 | { |
1060 | int err; | |
5578689a | 1061 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1062 | struct rt6_info *rt = NULL; |
1063 | struct net_device *dev = NULL; | |
1064 | struct inet6_dev *idev = NULL; | |
c71099ac | 1065 | struct fib6_table *table; |
1da177e4 LT |
1066 | int addr_type; |
1067 | ||
86872cb5 | 1068 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1069 | return -EINVAL; |
1070 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1071 | if (cfg->fc_src_len) |
1da177e4 LT |
1072 | return -EINVAL; |
1073 | #endif | |
86872cb5 | 1074 | if (cfg->fc_ifindex) { |
1da177e4 | 1075 | err = -ENODEV; |
5578689a | 1076 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1077 | if (!dev) |
1078 | goto out; | |
1079 | idev = in6_dev_get(dev); | |
1080 | if (!idev) | |
1081 | goto out; | |
1082 | } | |
1083 | ||
86872cb5 TG |
1084 | if (cfg->fc_metric == 0) |
1085 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1086 | |
5578689a | 1087 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1088 | if (table == NULL) { |
1089 | err = -ENOBUFS; | |
1090 | goto out; | |
1091 | } | |
1092 | ||
f2fc6a54 | 1093 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1094 | |
1095 | if (rt == NULL) { | |
1096 | err = -ENOMEM; | |
1097 | goto out; | |
1098 | } | |
1099 | ||
1100 | rt->u.dst.obsolete = -1; | |
6f704992 YH |
1101 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1102 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1103 | 0; | |
1da177e4 | 1104 | |
86872cb5 TG |
1105 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1106 | cfg->fc_protocol = RTPROT_BOOT; | |
1107 | rt->rt6i_protocol = cfg->fc_protocol; | |
1108 | ||
1109 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1110 | |
1111 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1112 | rt->u.dst.input = ip6_mc_input; | |
1113 | else | |
1114 | rt->u.dst.input = ip6_forward; | |
1115 | ||
1116 | rt->u.dst.output = ip6_output; | |
1117 | ||
86872cb5 TG |
1118 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1119 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1120 | if (rt->rt6i_dst.plen == 128) |
1121 | rt->u.dst.flags = DST_HOST; | |
1122 | ||
1123 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1124 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1125 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1126 | #endif |
1127 | ||
86872cb5 | 1128 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1129 | |
1130 | /* We cannot add true routes via loopback here, | |
1131 | they would result in kernel looping; promote them to reject routes | |
1132 | */ | |
86872cb5 | 1133 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1134 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1135 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1136 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1137 | if (dev) { |
1138 | dev_put(dev); | |
1139 | in6_dev_put(idev); | |
1140 | } | |
5578689a | 1141 | dev = net->loopback_dev; |
1da177e4 LT |
1142 | dev_hold(dev); |
1143 | idev = in6_dev_get(dev); | |
1144 | if (!idev) { | |
1145 | err = -ENODEV; | |
1146 | goto out; | |
1147 | } | |
1148 | } | |
1149 | rt->u.dst.output = ip6_pkt_discard_out; | |
1150 | rt->u.dst.input = ip6_pkt_discard; | |
1151 | rt->u.dst.error = -ENETUNREACH; | |
1152 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1153 | goto install_route; | |
1154 | } | |
1155 | ||
86872cb5 | 1156 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1157 | struct in6_addr *gw_addr; |
1158 | int gwa_type; | |
1159 | ||
86872cb5 TG |
1160 | gw_addr = &cfg->fc_gateway; |
1161 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1162 | gwa_type = ipv6_addr_type(gw_addr); |
1163 | ||
1164 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1165 | struct rt6_info *grt; | |
1166 | ||
1167 | /* IPv6 strictly inhibits using not link-local | |
1168 | addresses as nexthop address. | |
1169 | Otherwise, router will not able to send redirects. | |
1170 | It is very good, but in some (rare!) circumstances | |
1171 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1172 | some exceptions. --ANK | |
1173 | */ | |
1174 | err = -EINVAL; | |
1175 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1176 | goto out; | |
1177 | ||
5578689a | 1178 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1179 | |
1180 | err = -EHOSTUNREACH; | |
1181 | if (grt == NULL) | |
1182 | goto out; | |
1183 | if (dev) { | |
1184 | if (dev != grt->rt6i_dev) { | |
1185 | dst_release(&grt->u.dst); | |
1186 | goto out; | |
1187 | } | |
1188 | } else { | |
1189 | dev = grt->rt6i_dev; | |
1190 | idev = grt->rt6i_idev; | |
1191 | dev_hold(dev); | |
1192 | in6_dev_hold(grt->rt6i_idev); | |
1193 | } | |
1194 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1195 | err = 0; | |
1196 | dst_release(&grt->u.dst); | |
1197 | ||
1198 | if (err) | |
1199 | goto out; | |
1200 | } | |
1201 | err = -EINVAL; | |
1202 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1203 | goto out; | |
1204 | } | |
1205 | ||
1206 | err = -ENODEV; | |
1207 | if (dev == NULL) | |
1208 | goto out; | |
1209 | ||
86872cb5 | 1210 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1211 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1212 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1213 | err = PTR_ERR(rt->rt6i_nexthop); | |
1214 | rt->rt6i_nexthop = NULL; | |
1215 | goto out; | |
1216 | } | |
1217 | } | |
1218 | ||
86872cb5 | 1219 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1220 | |
1221 | install_route: | |
86872cb5 TG |
1222 | if (cfg->fc_mx) { |
1223 | struct nlattr *nla; | |
1224 | int remaining; | |
1225 | ||
1226 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1227 | int type = nla_type(nla); |
86872cb5 TG |
1228 | |
1229 | if (type) { | |
1230 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1231 | err = -EINVAL; |
1232 | goto out; | |
1233 | } | |
86872cb5 TG |
1234 | |
1235 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1236 | } |
1da177e4 LT |
1237 | } |
1238 | } | |
1239 | ||
5ffc02a1 | 1240 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1241 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
5ffc02a1 | 1242 | if (!dst_metric(&rt->u.dst, RTAX_MTU)) |
1da177e4 | 1243 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
5ffc02a1 | 1244 | if (!dst_metric(&rt->u.dst, RTAX_ADVMSS)) |
5578689a | 1245 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1246 | rt->u.dst.dev = dev; |
1247 | rt->rt6i_idev = idev; | |
c71099ac | 1248 | rt->rt6i_table = table; |
63152fc0 | 1249 | |
c346dca1 | 1250 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1251 | |
86872cb5 | 1252 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1253 | |
1254 | out: | |
1255 | if (dev) | |
1256 | dev_put(dev); | |
1257 | if (idev) | |
1258 | in6_dev_put(idev); | |
1259 | if (rt) | |
40aa7b90 | 1260 | dst_free(&rt->u.dst); |
1da177e4 LT |
1261 | return err; |
1262 | } | |
1263 | ||
86872cb5 | 1264 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1265 | { |
1266 | int err; | |
c71099ac | 1267 | struct fib6_table *table; |
c346dca1 | 1268 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1269 | |
8ed67789 | 1270 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1271 | return -ENOENT; |
1272 | ||
c71099ac TG |
1273 | table = rt->rt6i_table; |
1274 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1275 | |
86872cb5 | 1276 | err = fib6_del(rt, info); |
1da177e4 LT |
1277 | dst_release(&rt->u.dst); |
1278 | ||
c71099ac | 1279 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1280 | |
1281 | return err; | |
1282 | } | |
1283 | ||
e0a1ad73 TG |
1284 | int ip6_del_rt(struct rt6_info *rt) |
1285 | { | |
4d1169c1 | 1286 | struct nl_info info = { |
c346dca1 | 1287 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1288 | }; |
528c4ceb | 1289 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1290 | } |
1291 | ||
86872cb5 | 1292 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1293 | { |
c71099ac | 1294 | struct fib6_table *table; |
1da177e4 LT |
1295 | struct fib6_node *fn; |
1296 | struct rt6_info *rt; | |
1297 | int err = -ESRCH; | |
1298 | ||
5578689a | 1299 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1300 | if (table == NULL) |
1301 | return err; | |
1302 | ||
1303 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1304 | |
c71099ac | 1305 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1306 | &cfg->fc_dst, cfg->fc_dst_len, |
1307 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1308 | |
1da177e4 | 1309 | if (fn) { |
7cc48263 | 1310 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1311 | if (cfg->fc_ifindex && |
1da177e4 | 1312 | (rt->rt6i_dev == NULL || |
86872cb5 | 1313 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1314 | continue; |
86872cb5 TG |
1315 | if (cfg->fc_flags & RTF_GATEWAY && |
1316 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1317 | continue; |
86872cb5 | 1318 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1319 | continue; |
1320 | dst_hold(&rt->u.dst); | |
c71099ac | 1321 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1322 | |
86872cb5 | 1323 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1324 | } |
1325 | } | |
c71099ac | 1326 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1327 | |
1328 | return err; | |
1329 | } | |
1330 | ||
1331 | /* | |
1332 | * Handle redirects | |
1333 | */ | |
a6279458 YH |
1334 | struct ip6rd_flowi { |
1335 | struct flowi fl; | |
1336 | struct in6_addr gateway; | |
1337 | }; | |
1338 | ||
8ed67789 DL |
1339 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1340 | struct fib6_table *table, | |
a6279458 YH |
1341 | struct flowi *fl, |
1342 | int flags) | |
1da177e4 | 1343 | { |
a6279458 YH |
1344 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1345 | struct rt6_info *rt; | |
e843b9e1 | 1346 | struct fib6_node *fn; |
c71099ac | 1347 | |
1da177e4 | 1348 | /* |
e843b9e1 YH |
1349 | * Get the "current" route for this destination and |
1350 | * check if the redirect has come from approriate router. | |
1351 | * | |
1352 | * RFC 2461 specifies that redirects should only be | |
1353 | * accepted if they come from the nexthop to the target. | |
1354 | * Due to the way the routes are chosen, this notion | |
1355 | * is a bit fuzzy and one might need to check all possible | |
1356 | * routes. | |
1da177e4 | 1357 | */ |
1da177e4 | 1358 | |
c71099ac | 1359 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1360 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1361 | restart: |
7cc48263 | 1362 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1363 | /* |
1364 | * Current route is on-link; redirect is always invalid. | |
1365 | * | |
1366 | * Seems, previous statement is not true. It could | |
1367 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1368 | * But then router serving it might decide, that we should | |
1369 | * know truth 8)8) --ANK (980726). | |
1370 | */ | |
1371 | if (rt6_check_expired(rt)) | |
1372 | continue; | |
1373 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1374 | continue; | |
a6279458 | 1375 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1376 | continue; |
a6279458 | 1377 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1378 | continue; |
1379 | break; | |
1380 | } | |
a6279458 | 1381 | |
cb15d9c2 | 1382 | if (!rt) |
8ed67789 DL |
1383 | rt = net->ipv6.ip6_null_entry; |
1384 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1385 | out: |
a6279458 YH |
1386 | dst_hold(&rt->u.dst); |
1387 | ||
c71099ac | 1388 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1389 | |
a6279458 YH |
1390 | return rt; |
1391 | }; | |
1392 | ||
1393 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1394 | struct in6_addr *src, | |
1395 | struct in6_addr *gateway, | |
1396 | struct net_device *dev) | |
1397 | { | |
adaa70bb | 1398 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1399 | struct net *net = dev_net(dev); |
a6279458 YH |
1400 | struct ip6rd_flowi rdfl = { |
1401 | .fl = { | |
1402 | .oif = dev->ifindex, | |
1403 | .nl_u = { | |
1404 | .ip6_u = { | |
1405 | .daddr = *dest, | |
1406 | .saddr = *src, | |
1407 | }, | |
1408 | }, | |
1409 | }, | |
1410 | .gateway = *gateway, | |
1411 | }; | |
adaa70bb TG |
1412 | |
1413 | if (rt6_need_strict(dest)) | |
1414 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1415 | |
5578689a | 1416 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1417 | flags, __ip6_route_redirect); |
a6279458 YH |
1418 | } |
1419 | ||
1420 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1421 | struct in6_addr *saddr, | |
1422 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1423 | { | |
1424 | struct rt6_info *rt, *nrt = NULL; | |
1425 | struct netevent_redirect netevent; | |
c346dca1 | 1426 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1427 | |
1428 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1429 | ||
8ed67789 | 1430 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1431 | if (net_ratelimit()) |
1432 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1433 | "for redirect target\n"); | |
a6279458 | 1434 | goto out; |
1da177e4 LT |
1435 | } |
1436 | ||
1da177e4 LT |
1437 | /* |
1438 | * We have finally decided to accept it. | |
1439 | */ | |
1440 | ||
1ab1457c | 1441 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1442 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1443 | NEIGH_UPDATE_F_OVERRIDE| | |
1444 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1445 | NEIGH_UPDATE_F_ISROUTER)) | |
1446 | ); | |
1447 | ||
1448 | /* | |
1449 | * Redirect received -> path was valid. | |
1450 | * Look, redirects are sent only in response to data packets, | |
1451 | * so that this nexthop apparently is reachable. --ANK | |
1452 | */ | |
1453 | dst_confirm(&rt->u.dst); | |
1454 | ||
1455 | /* Duplicate redirect: silently ignore. */ | |
1456 | if (neigh == rt->u.dst.neighbour) | |
1457 | goto out; | |
1458 | ||
1459 | nrt = ip6_rt_copy(rt); | |
1460 | if (nrt == NULL) | |
1461 | goto out; | |
1462 | ||
1463 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1464 | if (on_link) | |
1465 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1466 | ||
1467 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1468 | nrt->rt6i_dst.plen = 128; | |
1469 | nrt->u.dst.flags |= DST_HOST; | |
1470 | ||
1471 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1472 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1473 | /* Reset pmtu, it may be better */ | |
1474 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
c346dca1 | 1475 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), |
5578689a | 1476 | dst_mtu(&nrt->u.dst)); |
1da177e4 | 1477 | |
40e22e8f | 1478 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1479 | goto out; |
1480 | ||
8d71740c TT |
1481 | netevent.old = &rt->u.dst; |
1482 | netevent.new = &nrt->u.dst; | |
1483 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1484 | ||
1da177e4 | 1485 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1486 | ip6_del_rt(rt); |
1da177e4 LT |
1487 | return; |
1488 | } | |
1489 | ||
1490 | out: | |
1ab1457c | 1491 | dst_release(&rt->u.dst); |
1da177e4 LT |
1492 | return; |
1493 | } | |
1494 | ||
1495 | /* | |
1496 | * Handle ICMP "packet too big" messages | |
1497 | * i.e. Path MTU discovery | |
1498 | */ | |
1499 | ||
1500 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1501 | struct net_device *dev, u32 pmtu) | |
1502 | { | |
1503 | struct rt6_info *rt, *nrt; | |
c346dca1 | 1504 | struct net *net = dev_net(dev); |
1da177e4 LT |
1505 | int allfrag = 0; |
1506 | ||
5578689a | 1507 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1508 | if (rt == NULL) |
1509 | return; | |
1510 | ||
1511 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1512 | goto out; | |
1513 | ||
1514 | if (pmtu < IPV6_MIN_MTU) { | |
1515 | /* | |
1ab1457c | 1516 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1517 | * MTU (1280) and a fragment header should always be included |
1518 | * after a node receiving Too Big message reporting PMTU is | |
1519 | * less than the IPv6 Minimum Link MTU. | |
1520 | */ | |
1521 | pmtu = IPV6_MIN_MTU; | |
1522 | allfrag = 1; | |
1523 | } | |
1524 | ||
1525 | /* New mtu received -> path was valid. | |
1526 | They are sent only in response to data packets, | |
1527 | so that this nexthop apparently is reachable. --ANK | |
1528 | */ | |
1529 | dst_confirm(&rt->u.dst); | |
1530 | ||
1531 | /* Host route. If it is static, it would be better | |
1532 | not to override it, but add new one, so that | |
1533 | when cache entry will expire old pmtu | |
1534 | would return automatically. | |
1535 | */ | |
1536 | if (rt->rt6i_flags & RTF_CACHE) { | |
1537 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1538 | if (allfrag) | |
1539 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1540 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1541 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1542 | goto out; | |
1543 | } | |
1544 | ||
1545 | /* Network route. | |
1546 | Two cases are possible: | |
1547 | 1. It is connected route. Action: COW | |
1548 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1549 | */ | |
d5315b50 | 1550 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1551 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1552 | else |
1553 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1554 | |
d5315b50 | 1555 | if (nrt) { |
a1e78363 YH |
1556 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1557 | if (allfrag) | |
1558 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1559 | ||
1560 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1561 | * happened within 5 mins, the recommended timer is 10 mins. | |
1562 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1563 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1564 | * and detecting PMTU increase will be automatically happened. | |
1565 | */ | |
5578689a | 1566 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1567 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1568 | ||
40e22e8f | 1569 | ip6_ins_rt(nrt); |
1da177e4 | 1570 | } |
1da177e4 LT |
1571 | out: |
1572 | dst_release(&rt->u.dst); | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * Misc support functions | |
1577 | */ | |
1578 | ||
1579 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1580 | { | |
c346dca1 | 1581 | struct net *net = dev_net(ort->rt6i_dev); |
f2fc6a54 | 1582 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1583 | |
1584 | if (rt) { | |
1585 | rt->u.dst.input = ort->u.dst.input; | |
1586 | rt->u.dst.output = ort->u.dst.output; | |
1587 | ||
1588 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1589 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1590 | rt->u.dst.dev = ort->u.dst.dev; |
1591 | if (rt->u.dst.dev) | |
1592 | dev_hold(rt->u.dst.dev); | |
1593 | rt->rt6i_idev = ort->rt6i_idev; | |
1594 | if (rt->rt6i_idev) | |
1595 | in6_dev_hold(rt->rt6i_idev); | |
1596 | rt->u.dst.lastuse = jiffies; | |
1597 | rt->rt6i_expires = 0; | |
1598 | ||
1599 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1600 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1601 | rt->rt6i_metric = 0; | |
1602 | ||
1603 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1604 | #ifdef CONFIG_IPV6_SUBTREES | |
1605 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1606 | #endif | |
c71099ac | 1607 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1608 | } |
1609 | return rt; | |
1610 | } | |
1611 | ||
70ceb4f5 | 1612 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1613 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1614 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1615 | struct in6_addr *gwaddr, int ifindex) |
1616 | { | |
1617 | struct fib6_node *fn; | |
1618 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1619 | struct fib6_table *table; |
1620 | ||
efa2cea0 | 1621 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1622 | if (table == NULL) |
1623 | return NULL; | |
70ceb4f5 | 1624 | |
c71099ac TG |
1625 | write_lock_bh(&table->tb6_lock); |
1626 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1627 | if (!fn) |
1628 | goto out; | |
1629 | ||
7cc48263 | 1630 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1631 | if (rt->rt6i_dev->ifindex != ifindex) |
1632 | continue; | |
1633 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1634 | continue; | |
1635 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1636 | continue; | |
1637 | dst_hold(&rt->u.dst); | |
1638 | break; | |
1639 | } | |
1640 | out: | |
c71099ac | 1641 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1642 | return rt; |
1643 | } | |
1644 | ||
efa2cea0 DL |
1645 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1646 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1647 | struct in6_addr *gwaddr, int ifindex, |
1648 | unsigned pref) | |
1649 | { | |
86872cb5 TG |
1650 | struct fib6_config cfg = { |
1651 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1652 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1653 | .fc_ifindex = ifindex, |
1654 | .fc_dst_len = prefixlen, | |
1655 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1656 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1657 | .fc_nlinfo.pid = 0, |
1658 | .fc_nlinfo.nlh = NULL, | |
1659 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1660 | }; |
1661 | ||
1662 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1663 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1664 | |
e317da96 YH |
1665 | /* We should treat it as a default route if prefix length is 0. */ |
1666 | if (!prefixlen) | |
86872cb5 | 1667 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1668 | |
86872cb5 | 1669 | ip6_route_add(&cfg); |
70ceb4f5 | 1670 | |
efa2cea0 | 1671 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1672 | } |
1673 | #endif | |
1674 | ||
1da177e4 | 1675 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1676 | { |
1da177e4 | 1677 | struct rt6_info *rt; |
c71099ac | 1678 | struct fib6_table *table; |
1da177e4 | 1679 | |
c346dca1 | 1680 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1681 | if (table == NULL) |
1682 | return NULL; | |
1da177e4 | 1683 | |
c71099ac | 1684 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1685 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1686 | if (dev == rt->rt6i_dev && |
045927ff | 1687 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1688 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1689 | break; | |
1690 | } | |
1691 | if (rt) | |
1692 | dst_hold(&rt->u.dst); | |
c71099ac | 1693 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1694 | return rt; |
1695 | } | |
1696 | ||
1697 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1698 | struct net_device *dev, |
1699 | unsigned int pref) | |
1da177e4 | 1700 | { |
86872cb5 TG |
1701 | struct fib6_config cfg = { |
1702 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1703 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1704 | .fc_ifindex = dev->ifindex, |
1705 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1706 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1707 | .fc_nlinfo.pid = 0, |
1708 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1709 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1710 | }; |
1da177e4 | 1711 | |
86872cb5 | 1712 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1713 | |
86872cb5 | 1714 | ip6_route_add(&cfg); |
1da177e4 | 1715 | |
1da177e4 LT |
1716 | return rt6_get_dflt_router(gwaddr, dev); |
1717 | } | |
1718 | ||
7b4da532 | 1719 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1720 | { |
1721 | struct rt6_info *rt; | |
c71099ac TG |
1722 | struct fib6_table *table; |
1723 | ||
1724 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1725 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1726 | if (table == NULL) |
1727 | return; | |
1da177e4 LT |
1728 | |
1729 | restart: | |
c71099ac | 1730 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1731 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1732 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1733 | dst_hold(&rt->u.dst); | |
c71099ac | 1734 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1735 | ip6_del_rt(rt); |
1da177e4 LT |
1736 | goto restart; |
1737 | } | |
1738 | } | |
c71099ac | 1739 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1740 | } |
1741 | ||
5578689a DL |
1742 | static void rtmsg_to_fib6_config(struct net *net, |
1743 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1744 | struct fib6_config *cfg) |
1745 | { | |
1746 | memset(cfg, 0, sizeof(*cfg)); | |
1747 | ||
1748 | cfg->fc_table = RT6_TABLE_MAIN; | |
1749 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1750 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1751 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1752 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1753 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1754 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1755 | ||
5578689a | 1756 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1757 | |
86872cb5 TG |
1758 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1759 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1760 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1761 | } | |
1762 | ||
5578689a | 1763 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1764 | { |
86872cb5 | 1765 | struct fib6_config cfg; |
1da177e4 LT |
1766 | struct in6_rtmsg rtmsg; |
1767 | int err; | |
1768 | ||
1769 | switch(cmd) { | |
1770 | case SIOCADDRT: /* Add a route */ | |
1771 | case SIOCDELRT: /* Delete a route */ | |
1772 | if (!capable(CAP_NET_ADMIN)) | |
1773 | return -EPERM; | |
1774 | err = copy_from_user(&rtmsg, arg, | |
1775 | sizeof(struct in6_rtmsg)); | |
1776 | if (err) | |
1777 | return -EFAULT; | |
86872cb5 | 1778 | |
5578689a | 1779 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1780 | |
1da177e4 LT |
1781 | rtnl_lock(); |
1782 | switch (cmd) { | |
1783 | case SIOCADDRT: | |
86872cb5 | 1784 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1785 | break; |
1786 | case SIOCDELRT: | |
86872cb5 | 1787 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1788 | break; |
1789 | default: | |
1790 | err = -EINVAL; | |
1791 | } | |
1792 | rtnl_unlock(); | |
1793 | ||
1794 | return err; | |
3ff50b79 | 1795 | } |
1da177e4 LT |
1796 | |
1797 | return -EINVAL; | |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | * Drop the packet on the floor | |
1802 | */ | |
1803 | ||
50eb431d | 1804 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1805 | { |
612f09e8 YH |
1806 | int type; |
1807 | switch (ipstats_mib_noroutes) { | |
1808 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1809 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1810 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1811 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1812 | break; | |
1813 | } | |
1814 | /* FALLTHROUGH */ | |
1815 | case IPSTATS_MIB_OUTNOROUTES: | |
1816 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1817 | break; | |
1818 | } | |
9ce8ade0 | 1819 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1820 | kfree_skb(skb); |
1821 | return 0; | |
1822 | } | |
1823 | ||
9ce8ade0 TG |
1824 | static int ip6_pkt_discard(struct sk_buff *skb) |
1825 | { | |
612f09e8 | 1826 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1827 | } |
1828 | ||
20380731 | 1829 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1830 | { |
1831 | skb->dev = skb->dst->dev; | |
612f09e8 | 1832 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1833 | } |
1834 | ||
6723ab54 DM |
1835 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1836 | ||
9ce8ade0 TG |
1837 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1838 | { | |
612f09e8 | 1839 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1840 | } |
1841 | ||
1842 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1843 | { | |
1844 | skb->dev = skb->dst->dev; | |
612f09e8 | 1845 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1846 | } |
1847 | ||
6723ab54 DM |
1848 | #endif |
1849 | ||
1da177e4 LT |
1850 | /* |
1851 | * Allocate a dst for local (unicast / anycast) address. | |
1852 | */ | |
1853 | ||
1854 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1855 | const struct in6_addr *addr, | |
1856 | int anycast) | |
1857 | { | |
c346dca1 | 1858 | struct net *net = dev_net(idev->dev); |
f2fc6a54 | 1859 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1860 | |
1861 | if (rt == NULL) | |
1862 | return ERR_PTR(-ENOMEM); | |
1863 | ||
5578689a | 1864 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1865 | in6_dev_hold(idev); |
1866 | ||
1867 | rt->u.dst.flags = DST_HOST; | |
1868 | rt->u.dst.input = ip6_input; | |
1869 | rt->u.dst.output = ip6_output; | |
5578689a | 1870 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1871 | rt->rt6i_idev = idev; |
1872 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1873 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1874 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1875 | rt->u.dst.obsolete = -1; | |
1876 | ||
1877 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1878 | if (anycast) |
1879 | rt->rt6i_flags |= RTF_ANYCAST; | |
1880 | else | |
1da177e4 LT |
1881 | rt->rt6i_flags |= RTF_LOCAL; |
1882 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1883 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1884 | dst_free(&rt->u.dst); |
1da177e4 LT |
1885 | return ERR_PTR(-ENOMEM); |
1886 | } | |
1887 | ||
1888 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1889 | rt->rt6i_dst.plen = 128; | |
5578689a | 1890 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1891 | |
1892 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1893 | ||
1894 | return rt; | |
1895 | } | |
1896 | ||
8ed67789 DL |
1897 | struct arg_dev_net { |
1898 | struct net_device *dev; | |
1899 | struct net *net; | |
1900 | }; | |
1901 | ||
1da177e4 LT |
1902 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1903 | { | |
8ed67789 DL |
1904 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1905 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1906 | ||
1907 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1908 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1909 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1910 | return -1; | |
1911 | } | |
1912 | return 0; | |
1913 | } | |
1914 | ||
f3db4851 | 1915 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1916 | { |
8ed67789 DL |
1917 | struct arg_dev_net adn = { |
1918 | .dev = dev, | |
1919 | .net = net, | |
1920 | }; | |
1921 | ||
1922 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1da177e4 LT |
1923 | } |
1924 | ||
1925 | struct rt6_mtu_change_arg | |
1926 | { | |
1927 | struct net_device *dev; | |
1928 | unsigned mtu; | |
1929 | }; | |
1930 | ||
1931 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1932 | { | |
1933 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1934 | struct inet6_dev *idev; | |
c346dca1 | 1935 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
1936 | |
1937 | /* In IPv6 pmtu discovery is not optional, | |
1938 | so that RTAX_MTU lock cannot disable it. | |
1939 | We still use this lock to block changes | |
1940 | caused by addrconf/ndisc. | |
1941 | */ | |
1942 | ||
1943 | idev = __in6_dev_get(arg->dev); | |
1944 | if (idev == NULL) | |
1945 | return 0; | |
1946 | ||
1947 | /* For administrative MTU increase, there is no way to discover | |
1948 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1949 | Since RFC 1981 doesn't include administrative MTU increase | |
1950 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1951 | */ | |
1952 | /* | |
1953 | If new MTU is less than route PMTU, this new MTU will be the | |
1954 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1955 | decreases; if new MTU is greater than route PMTU, and the | |
1956 | old MTU is the lowest MTU in the path, update the route PMTU | |
1957 | to reflect the increase. In this case if the other nodes' MTU | |
1958 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1959 | PMTU discouvery. | |
1960 | */ | |
1961 | if (rt->rt6i_dev == arg->dev && | |
1962 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1963 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1964 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1965 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1966 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 1967 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 1968 | } |
1da177e4 LT |
1969 | return 0; |
1970 | } | |
1971 | ||
1972 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1973 | { | |
c71099ac TG |
1974 | struct rt6_mtu_change_arg arg = { |
1975 | .dev = dev, | |
1976 | .mtu = mtu, | |
1977 | }; | |
1da177e4 | 1978 | |
c346dca1 | 1979 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1980 | } |
1981 | ||
ef7c79ed | 1982 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1983 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1984 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1985 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1986 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1987 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1988 | }; | |
1989 | ||
1990 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1991 | struct fib6_config *cfg) | |
1da177e4 | 1992 | { |
86872cb5 TG |
1993 | struct rtmsg *rtm; |
1994 | struct nlattr *tb[RTA_MAX+1]; | |
1995 | int err; | |
1da177e4 | 1996 | |
86872cb5 TG |
1997 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1998 | if (err < 0) | |
1999 | goto errout; | |
1da177e4 | 2000 | |
86872cb5 TG |
2001 | err = -EINVAL; |
2002 | rtm = nlmsg_data(nlh); | |
2003 | memset(cfg, 0, sizeof(*cfg)); | |
2004 | ||
2005 | cfg->fc_table = rtm->rtm_table; | |
2006 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2007 | cfg->fc_src_len = rtm->rtm_src_len; | |
2008 | cfg->fc_flags = RTF_UP; | |
2009 | cfg->fc_protocol = rtm->rtm_protocol; | |
2010 | ||
2011 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2012 | cfg->fc_flags |= RTF_REJECT; | |
2013 | ||
2014 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2015 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2016 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2017 | |
2018 | if (tb[RTA_GATEWAY]) { | |
2019 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2020 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2021 | } |
86872cb5 TG |
2022 | |
2023 | if (tb[RTA_DST]) { | |
2024 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2025 | ||
2026 | if (nla_len(tb[RTA_DST]) < plen) | |
2027 | goto errout; | |
2028 | ||
2029 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2030 | } |
86872cb5 TG |
2031 | |
2032 | if (tb[RTA_SRC]) { | |
2033 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2034 | ||
2035 | if (nla_len(tb[RTA_SRC]) < plen) | |
2036 | goto errout; | |
2037 | ||
2038 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2039 | } |
86872cb5 TG |
2040 | |
2041 | if (tb[RTA_OIF]) | |
2042 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2043 | ||
2044 | if (tb[RTA_PRIORITY]) | |
2045 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2046 | ||
2047 | if (tb[RTA_METRICS]) { | |
2048 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2049 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2050 | } |
86872cb5 TG |
2051 | |
2052 | if (tb[RTA_TABLE]) | |
2053 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2054 | ||
2055 | err = 0; | |
2056 | errout: | |
2057 | return err; | |
1da177e4 LT |
2058 | } |
2059 | ||
c127ea2c | 2060 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2061 | { |
86872cb5 TG |
2062 | struct fib6_config cfg; |
2063 | int err; | |
1da177e4 | 2064 | |
86872cb5 TG |
2065 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2066 | if (err < 0) | |
2067 | return err; | |
2068 | ||
2069 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2070 | } |
2071 | ||
c127ea2c | 2072 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2073 | { |
86872cb5 TG |
2074 | struct fib6_config cfg; |
2075 | int err; | |
1da177e4 | 2076 | |
86872cb5 TG |
2077 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2078 | if (err < 0) | |
2079 | return err; | |
2080 | ||
2081 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2082 | } |
2083 | ||
339bf98f TG |
2084 | static inline size_t rt6_nlmsg_size(void) |
2085 | { | |
2086 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2087 | + nla_total_size(16) /* RTA_SRC */ | |
2088 | + nla_total_size(16) /* RTA_DST */ | |
2089 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2090 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2091 | + nla_total_size(4) /* RTA_TABLE */ | |
2092 | + nla_total_size(4) /* RTA_IIF */ | |
2093 | + nla_total_size(4) /* RTA_OIF */ | |
2094 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2095 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2096 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2097 | } | |
2098 | ||
1da177e4 | 2099 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2100 | struct in6_addr *dst, struct in6_addr *src, |
2101 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2102 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2103 | { |
2104 | struct rtmsg *rtm; | |
2d7202bf | 2105 | struct nlmsghdr *nlh; |
e3703b3d | 2106 | long expires; |
9e762a4a | 2107 | u32 table; |
1da177e4 LT |
2108 | |
2109 | if (prefix) { /* user wants prefix routes only */ | |
2110 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2111 | /* success since this is not a prefix route */ | |
2112 | return 1; | |
2113 | } | |
2114 | } | |
2115 | ||
2d7202bf TG |
2116 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2117 | if (nlh == NULL) | |
26932566 | 2118 | return -EMSGSIZE; |
2d7202bf TG |
2119 | |
2120 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2121 | rtm->rtm_family = AF_INET6; |
2122 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2123 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2124 | rtm->rtm_tos = 0; | |
c71099ac | 2125 | if (rt->rt6i_table) |
9e762a4a | 2126 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2127 | else |
9e762a4a PM |
2128 | table = RT6_TABLE_UNSPEC; |
2129 | rtm->rtm_table = table; | |
2d7202bf | 2130 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2131 | if (rt->rt6i_flags&RTF_REJECT) |
2132 | rtm->rtm_type = RTN_UNREACHABLE; | |
2133 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2134 | rtm->rtm_type = RTN_LOCAL; | |
2135 | else | |
2136 | rtm->rtm_type = RTN_UNICAST; | |
2137 | rtm->rtm_flags = 0; | |
2138 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2139 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2140 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2141 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2142 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2143 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2144 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2145 | rtm->rtm_protocol = RTPROT_RA; | |
2146 | ||
2147 | if (rt->rt6i_flags&RTF_CACHE) | |
2148 | rtm->rtm_flags |= RTM_F_CLONED; | |
2149 | ||
2150 | if (dst) { | |
2d7202bf | 2151 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2152 | rtm->rtm_dst_len = 128; |
1da177e4 | 2153 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2154 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2155 | #ifdef CONFIG_IPV6_SUBTREES |
2156 | if (src) { | |
2d7202bf | 2157 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2158 | rtm->rtm_src_len = 128; |
1da177e4 | 2159 | } else if (rtm->rtm_src_len) |
2d7202bf | 2160 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2161 | #endif |
7bc570c8 YH |
2162 | if (iif) { |
2163 | #ifdef CONFIG_IPV6_MROUTE | |
2164 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
2165 | int err = ip6mr_get_route(skb, rtm, nowait); | |
2166 | if (err <= 0) { | |
2167 | if (!nowait) { | |
2168 | if (err == 0) | |
2169 | return 0; | |
2170 | goto nla_put_failure; | |
2171 | } else { | |
2172 | if (err == -EMSGSIZE) | |
2173 | goto nla_put_failure; | |
2174 | } | |
2175 | } | |
2176 | } else | |
2177 | #endif | |
2178 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2179 | } else if (dst) { | |
1da177e4 | 2180 | struct in6_addr saddr_buf; |
5e5f3f0f | 2181 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
7cbca67c | 2182 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2183 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2184 | } |
2d7202bf | 2185 | |
1da177e4 | 2186 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2187 | goto nla_put_failure; |
2188 | ||
1da177e4 | 2189 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2190 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2191 | ||
1da177e4 | 2192 | if (rt->u.dst.dev) |
2d7202bf TG |
2193 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2194 | ||
2195 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2196 | |
36e3deae YH |
2197 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2198 | expires = 0; | |
2199 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2200 | expires = rt->rt6i_expires - jiffies; | |
2201 | else | |
2202 | expires = INT_MAX; | |
69cdf8f9 | 2203 | |
e3703b3d TG |
2204 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, |
2205 | expires, rt->u.dst.error) < 0) | |
2206 | goto nla_put_failure; | |
2d7202bf TG |
2207 | |
2208 | return nlmsg_end(skb, nlh); | |
2209 | ||
2210 | nla_put_failure: | |
26932566 PM |
2211 | nlmsg_cancel(skb, nlh); |
2212 | return -EMSGSIZE; | |
1da177e4 LT |
2213 | } |
2214 | ||
1b43af54 | 2215 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2216 | { |
2217 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2218 | int prefix; | |
2219 | ||
2d7202bf TG |
2220 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2221 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2222 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2223 | } else | |
2224 | prefix = 0; | |
2225 | ||
2226 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2227 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
7bc570c8 | 2228 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2229 | } |
2230 | ||
c127ea2c | 2231 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2232 | { |
3b1e0a65 | 2233 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2234 | struct nlattr *tb[RTA_MAX+1]; |
2235 | struct rt6_info *rt; | |
1da177e4 | 2236 | struct sk_buff *skb; |
ab364a6f | 2237 | struct rtmsg *rtm; |
1da177e4 | 2238 | struct flowi fl; |
ab364a6f | 2239 | int err, iif = 0; |
1da177e4 | 2240 | |
ab364a6f TG |
2241 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2242 | if (err < 0) | |
2243 | goto errout; | |
1da177e4 | 2244 | |
ab364a6f | 2245 | err = -EINVAL; |
1da177e4 | 2246 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2247 | |
ab364a6f TG |
2248 | if (tb[RTA_SRC]) { |
2249 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2250 | goto errout; | |
2251 | ||
2252 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2253 | } | |
2254 | ||
2255 | if (tb[RTA_DST]) { | |
2256 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2257 | goto errout; | |
2258 | ||
2259 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2260 | } | |
2261 | ||
2262 | if (tb[RTA_IIF]) | |
2263 | iif = nla_get_u32(tb[RTA_IIF]); | |
2264 | ||
2265 | if (tb[RTA_OIF]) | |
2266 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2267 | |
2268 | if (iif) { | |
2269 | struct net_device *dev; | |
5578689a | 2270 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2271 | if (!dev) { |
2272 | err = -ENODEV; | |
ab364a6f | 2273 | goto errout; |
1da177e4 LT |
2274 | } |
2275 | } | |
2276 | ||
ab364a6f TG |
2277 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2278 | if (skb == NULL) { | |
2279 | err = -ENOBUFS; | |
2280 | goto errout; | |
2281 | } | |
1da177e4 | 2282 | |
ab364a6f TG |
2283 | /* Reserve room for dummy headers, this skb can pass |
2284 | through good chunk of routing engine. | |
2285 | */ | |
459a98ed | 2286 | skb_reset_mac_header(skb); |
ab364a6f | 2287 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2288 | |
8a3edd80 | 2289 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
2290 | skb->dst = &rt->u.dst; |
2291 | ||
ab364a6f | 2292 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2293 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2294 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2295 | if (err < 0) { |
ab364a6f TG |
2296 | kfree_skb(skb); |
2297 | goto errout; | |
1da177e4 LT |
2298 | } |
2299 | ||
5578689a | 2300 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2301 | errout: |
1da177e4 | 2302 | return err; |
1da177e4 LT |
2303 | } |
2304 | ||
86872cb5 | 2305 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2306 | { |
2307 | struct sk_buff *skb; | |
5578689a | 2308 | struct net *net = info->nl_net; |
528c4ceb DL |
2309 | u32 seq; |
2310 | int err; | |
2311 | ||
2312 | err = -ENOBUFS; | |
2313 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2314 | |
339bf98f | 2315 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2316 | if (skb == NULL) |
2317 | goto errout; | |
2318 | ||
528c4ceb | 2319 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
7bc570c8 | 2320 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2321 | if (err < 0) { |
2322 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2323 | WARN_ON(err == -EMSGSIZE); | |
2324 | kfree_skb(skb); | |
2325 | goto errout; | |
2326 | } | |
5578689a DL |
2327 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2328 | info->nlh, gfp_any()); | |
21713ebc TG |
2329 | errout: |
2330 | if (err < 0) | |
5578689a | 2331 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2332 | } |
2333 | ||
8ed67789 DL |
2334 | static int ip6_route_dev_notify(struct notifier_block *this, |
2335 | unsigned long event, void *data) | |
2336 | { | |
2337 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2338 | struct net *net = dev_net(dev); |
8ed67789 DL |
2339 | |
2340 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2341 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2342 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2343 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2344 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2345 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2346 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2347 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2348 | #endif | |
2349 | } | |
2350 | ||
2351 | return NOTIFY_OK; | |
2352 | } | |
2353 | ||
1da177e4 LT |
2354 | /* |
2355 | * /proc | |
2356 | */ | |
2357 | ||
2358 | #ifdef CONFIG_PROC_FS | |
2359 | ||
2360 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2361 | ||
2362 | struct rt6_proc_arg | |
2363 | { | |
2364 | char *buffer; | |
2365 | int offset; | |
2366 | int length; | |
2367 | int skip; | |
2368 | int len; | |
2369 | }; | |
2370 | ||
2371 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2372 | { | |
33120b30 | 2373 | struct seq_file *m = p_arg; |
1da177e4 | 2374 | |
33120b30 AD |
2375 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2376 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2377 | |
2378 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2379 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2380 | rt->rt6i_src.plen); | |
1da177e4 | 2381 | #else |
33120b30 | 2382 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2383 | #endif |
2384 | ||
2385 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2386 | seq_printf(m, NIP6_SEQFMT, |
2387 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2388 | } else { |
33120b30 | 2389 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2390 | } |
33120b30 AD |
2391 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2392 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2393 | rt->u.dst.__use, rt->rt6i_flags, | |
2394 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2395 | return 0; |
2396 | } | |
2397 | ||
33120b30 | 2398 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2399 | { |
f3db4851 DL |
2400 | struct net *net = (struct net *)m->private; |
2401 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2402 | return 0; |
2403 | } | |
1da177e4 | 2404 | |
33120b30 AD |
2405 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2406 | { | |
a2333525 | 2407 | int err; |
f3db4851 DL |
2408 | struct net *net = get_proc_net(inode); |
2409 | if (!net) | |
2410 | return -ENXIO; | |
a2333525 PE |
2411 | |
2412 | err = single_open(file, ipv6_route_show, net); | |
2413 | if (err < 0) { | |
2414 | put_net(net); | |
2415 | return err; | |
2416 | } | |
2417 | ||
2418 | return 0; | |
f3db4851 DL |
2419 | } |
2420 | ||
2421 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2422 | { | |
2423 | struct seq_file *seq = file->private_data; | |
2424 | struct net *net = seq->private; | |
2425 | put_net(net); | |
2426 | return single_release(inode, file); | |
1da177e4 LT |
2427 | } |
2428 | ||
33120b30 AD |
2429 | static const struct file_operations ipv6_route_proc_fops = { |
2430 | .owner = THIS_MODULE, | |
2431 | .open = ipv6_route_open, | |
2432 | .read = seq_read, | |
2433 | .llseek = seq_lseek, | |
f3db4851 | 2434 | .release = ipv6_route_release, |
33120b30 AD |
2435 | }; |
2436 | ||
1da177e4 LT |
2437 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2438 | { | |
69ddb805 | 2439 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2440 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2441 | net->ipv6.rt6_stats->fib_nodes, |
2442 | net->ipv6.rt6_stats->fib_route_nodes, | |
2443 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2444 | net->ipv6.rt6_stats->fib_rt_entries, | |
2445 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2446 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2447 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2448 | |
2449 | return 0; | |
2450 | } | |
2451 | ||
2452 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2453 | { | |
a2333525 | 2454 | int err; |
69ddb805 | 2455 | struct net *net = get_proc_net(inode); |
a2333525 PE |
2456 | if (!net) |
2457 | return -ENXIO; | |
2458 | ||
2459 | err = single_open(file, rt6_stats_seq_show, net); | |
2460 | if (err < 0) { | |
2461 | put_net(net); | |
2462 | return err; | |
2463 | } | |
2464 | ||
2465 | return 0; | |
69ddb805 DL |
2466 | } |
2467 | ||
2468 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2469 | { | |
2470 | struct seq_file *seq = file->private_data; | |
2471 | struct net *net = (struct net *)seq->private; | |
2472 | put_net(net); | |
2473 | return single_release(inode, file); | |
1da177e4 LT |
2474 | } |
2475 | ||
9a32144e | 2476 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2477 | .owner = THIS_MODULE, |
2478 | .open = rt6_stats_seq_open, | |
2479 | .read = seq_read, | |
2480 | .llseek = seq_lseek, | |
69ddb805 | 2481 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2482 | }; |
2483 | #endif /* CONFIG_PROC_FS */ | |
2484 | ||
2485 | #ifdef CONFIG_SYSCTL | |
2486 | ||
1da177e4 LT |
2487 | static |
2488 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2489 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2490 | { | |
5b7c931d DL |
2491 | struct net *net = current->nsproxy->net_ns; |
2492 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2493 | if (write) { |
2494 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2495 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2496 | return 0; |
2497 | } else | |
2498 | return -EINVAL; | |
2499 | } | |
2500 | ||
760f2d01 | 2501 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2502 | { |
1da177e4 | 2503 | .procname = "flush", |
4990509f | 2504 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2505 | .maxlen = sizeof(int), |
89c8b3a1 | 2506 | .mode = 0200, |
1ab1457c | 2507 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2508 | }, |
2509 | { | |
2510 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2511 | .procname = "gc_thresh", | |
9a7ec3a9 | 2512 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2513 | .maxlen = sizeof(int), |
2514 | .mode = 0644, | |
1ab1457c | 2515 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2516 | }, |
2517 | { | |
2518 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2519 | .procname = "max_size", | |
4990509f | 2520 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2521 | .maxlen = sizeof(int), |
2522 | .mode = 0644, | |
1ab1457c | 2523 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2524 | }, |
2525 | { | |
2526 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2527 | .procname = "gc_min_interval", | |
4990509f | 2528 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2529 | .maxlen = sizeof(int), |
2530 | .mode = 0644, | |
1ab1457c | 2531 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2532 | .strategy = &sysctl_jiffies, |
2533 | }, | |
2534 | { | |
2535 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2536 | .procname = "gc_timeout", | |
4990509f | 2537 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2538 | .maxlen = sizeof(int), |
2539 | .mode = 0644, | |
1ab1457c | 2540 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2541 | .strategy = &sysctl_jiffies, |
2542 | }, | |
2543 | { | |
2544 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2545 | .procname = "gc_interval", | |
4990509f | 2546 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2547 | .maxlen = sizeof(int), |
2548 | .mode = 0644, | |
1ab1457c | 2549 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2550 | .strategy = &sysctl_jiffies, |
2551 | }, | |
2552 | { | |
2553 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2554 | .procname = "gc_elasticity", | |
4990509f | 2555 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2556 | .maxlen = sizeof(int), |
2557 | .mode = 0644, | |
1ab1457c | 2558 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2559 | .strategy = &sysctl_jiffies, |
2560 | }, | |
2561 | { | |
2562 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2563 | .procname = "mtu_expires", | |
4990509f | 2564 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2565 | .maxlen = sizeof(int), |
2566 | .mode = 0644, | |
1ab1457c | 2567 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2568 | .strategy = &sysctl_jiffies, |
2569 | }, | |
2570 | { | |
2571 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2572 | .procname = "min_adv_mss", | |
4990509f | 2573 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2574 | .maxlen = sizeof(int), |
2575 | .mode = 0644, | |
1ab1457c | 2576 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2577 | .strategy = &sysctl_jiffies, |
2578 | }, | |
2579 | { | |
2580 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2581 | .procname = "gc_min_interval_ms", | |
4990509f | 2582 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2583 | .maxlen = sizeof(int), |
2584 | .mode = 0644, | |
1ab1457c | 2585 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2586 | .strategy = &sysctl_ms_jiffies, |
2587 | }, | |
2588 | { .ctl_name = 0 } | |
2589 | }; | |
2590 | ||
760f2d01 DL |
2591 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2592 | { | |
2593 | struct ctl_table *table; | |
2594 | ||
2595 | table = kmemdup(ipv6_route_table_template, | |
2596 | sizeof(ipv6_route_table_template), | |
2597 | GFP_KERNEL); | |
5ee09105 YH |
2598 | |
2599 | if (table) { | |
2600 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2601 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2602 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2603 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2604 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2605 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2606 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2607 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2608 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2609 | } | |
2610 | ||
760f2d01 DL |
2611 | return table; |
2612 | } | |
1da177e4 LT |
2613 | #endif |
2614 | ||
cdb18761 DL |
2615 | static int ip6_route_net_init(struct net *net) |
2616 | { | |
633d424b | 2617 | int ret = -ENOMEM; |
8ed67789 | 2618 | |
f2fc6a54 BT |
2619 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2620 | sizeof(*net->ipv6.ip6_dst_ops), | |
2621 | GFP_KERNEL); | |
2622 | if (!net->ipv6.ip6_dst_ops) | |
2623 | goto out; | |
48115bec | 2624 | net->ipv6.ip6_dst_ops->dst_net = hold_net(net); |
f2fc6a54 | 2625 | |
8ed67789 DL |
2626 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2627 | sizeof(*net->ipv6.ip6_null_entry), | |
2628 | GFP_KERNEL); | |
2629 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2630 | goto out_ip6_dst_ops; |
8ed67789 DL |
2631 | net->ipv6.ip6_null_entry->u.dst.path = |
2632 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2633 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2634 | |
2635 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2636 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2637 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2638 | GFP_KERNEL); | |
2639 | if (!net->ipv6.ip6_prohibit_entry) { | |
2640 | kfree(net->ipv6.ip6_null_entry); | |
2641 | goto out; | |
2642 | } | |
2643 | net->ipv6.ip6_prohibit_entry->u.dst.path = | |
2644 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2645 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2646 | |
2647 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2648 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2649 | GFP_KERNEL); | |
2650 | if (!net->ipv6.ip6_blk_hole_entry) { | |
2651 | kfree(net->ipv6.ip6_null_entry); | |
2652 | kfree(net->ipv6.ip6_prohibit_entry); | |
2653 | goto out; | |
2654 | } | |
2655 | net->ipv6.ip6_blk_hole_entry->u.dst.path = | |
2656 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2657 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2658 | #endif |
2659 | ||
cdb18761 DL |
2660 | #ifdef CONFIG_PROC_FS |
2661 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2662 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2663 | #endif | |
6891a346 BT |
2664 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2665 | ||
8ed67789 DL |
2666 | ret = 0; |
2667 | out: | |
2668 | return ret; | |
f2fc6a54 BT |
2669 | |
2670 | out_ip6_dst_ops: | |
48115bec | 2671 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 BT |
2672 | kfree(net->ipv6.ip6_dst_ops); |
2673 | goto out; | |
cdb18761 DL |
2674 | } |
2675 | ||
2676 | static void ip6_route_net_exit(struct net *net) | |
2677 | { | |
2678 | #ifdef CONFIG_PROC_FS | |
2679 | proc_net_remove(net, "ipv6_route"); | |
2680 | proc_net_remove(net, "rt6_stats"); | |
2681 | #endif | |
8ed67789 DL |
2682 | kfree(net->ipv6.ip6_null_entry); |
2683 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2684 | kfree(net->ipv6.ip6_prohibit_entry); | |
2685 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2686 | #endif | |
48115bec | 2687 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 | 2688 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2689 | } |
2690 | ||
2691 | static struct pernet_operations ip6_route_net_ops = { | |
2692 | .init = ip6_route_net_init, | |
2693 | .exit = ip6_route_net_exit, | |
2694 | }; | |
2695 | ||
8ed67789 DL |
2696 | static struct notifier_block ip6_route_dev_notifier = { |
2697 | .notifier_call = ip6_route_dev_notify, | |
2698 | .priority = 0, | |
2699 | }; | |
2700 | ||
433d49c3 | 2701 | int __init ip6_route_init(void) |
1da177e4 | 2702 | { |
433d49c3 DL |
2703 | int ret; |
2704 | ||
9a7ec3a9 DL |
2705 | ret = -ENOMEM; |
2706 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2707 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2708 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2709 | if (!ip6_dst_ops_template.kmem_cachep) |
f2fc6a54 | 2710 | goto out;; |
14e50e57 | 2711 | |
8ed67789 DL |
2712 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2713 | if (ret) | |
bdb3289f | 2714 | goto out_kmem_cache; |
bdb3289f | 2715 | |
8ed67789 DL |
2716 | /* Registering of the loopback is done before this portion of code, |
2717 | * the loopback reference in rt6_info will not be taken, do it | |
2718 | * manually for init_net */ | |
2719 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2720 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2721 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2722 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2723 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2724 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2725 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2726 | #endif | |
433d49c3 DL |
2727 | ret = fib6_init(); |
2728 | if (ret) | |
8ed67789 | 2729 | goto out_register_subsys; |
433d49c3 | 2730 | |
433d49c3 DL |
2731 | ret = xfrm6_init(); |
2732 | if (ret) | |
cdb18761 | 2733 | goto out_fib6_init; |
c35b7e72 | 2734 | |
433d49c3 DL |
2735 | ret = fib6_rules_init(); |
2736 | if (ret) | |
2737 | goto xfrm6_init; | |
7e5449c2 | 2738 | |
433d49c3 DL |
2739 | ret = -ENOBUFS; |
2740 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2741 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2742 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2743 | goto fib6_rules_init; | |
c127ea2c | 2744 | |
8ed67789 | 2745 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2746 | if (ret) |
2747 | goto fib6_rules_init; | |
8ed67789 | 2748 | |
433d49c3 DL |
2749 | out: |
2750 | return ret; | |
2751 | ||
2752 | fib6_rules_init: | |
433d49c3 DL |
2753 | fib6_rules_cleanup(); |
2754 | xfrm6_init: | |
433d49c3 | 2755 | xfrm6_fini(); |
433d49c3 | 2756 | out_fib6_init: |
433d49c3 | 2757 | fib6_gc_cleanup(); |
8ed67789 DL |
2758 | out_register_subsys: |
2759 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2760 | out_kmem_cache: |
f2fc6a54 | 2761 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2762 | goto out; |
1da177e4 LT |
2763 | } |
2764 | ||
2765 | void ip6_route_cleanup(void) | |
2766 | { | |
8ed67789 | 2767 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2768 | fib6_rules_cleanup(); |
1da177e4 | 2769 | xfrm6_fini(); |
1da177e4 | 2770 | fib6_gc_cleanup(); |
8ed67789 | 2771 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2772 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2773 | } |