Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
7bc570c8 | 39 | #include <linux/mroute6.h> |
1da177e4 | 40 | #include <linux/init.h> |
1da177e4 | 41 | #include <linux/if_arp.h> |
1da177e4 LT |
42 | #include <linux/proc_fs.h> |
43 | #include <linux/seq_file.h> | |
5b7c931d | 44 | #include <linux/nsproxy.h> |
457c4cbc | 45 | #include <net/net_namespace.h> |
1da177e4 LT |
46 | #include <net/snmp.h> |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
55 | #include <net/xfrm.h> | |
8d71740c | 56 | #include <net/netevent.h> |
21713ebc | 57 | #include <net/netlink.h> |
1da177e4 LT |
58 | |
59 | #include <asm/uaccess.h> | |
60 | ||
61 | #ifdef CONFIG_SYSCTL | |
62 | #include <linux/sysctl.h> | |
63 | #endif | |
64 | ||
65 | /* Set to 3 to get tracing. */ | |
66 | #define RT6_DEBUG 2 | |
67 | ||
68 | #if RT6_DEBUG >= 3 | |
69 | #define RDBG(x) printk x | |
70 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
71 | #else | |
72 | #define RDBG(x) | |
73 | #define RT6_TRACE(x...) do { ; } while (0) | |
74 | #endif | |
75 | ||
519fbd87 | 76 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 77 | |
1da177e4 LT |
78 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
79 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
80 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
81 | static void ip6_dst_destroy(struct dst_entry *); | |
82 | static void ip6_dst_ifdown(struct dst_entry *, | |
83 | struct net_device *dev, int how); | |
569d3645 | 84 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
85 | |
86 | static int ip6_pkt_discard(struct sk_buff *skb); | |
87 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
88 | static void ip6_link_failure(struct sk_buff *skb); | |
89 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
90 | ||
70ceb4f5 | 91 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
92 | static struct rt6_info *rt6_add_route_info(struct net *net, |
93 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
94 | struct in6_addr *gwaddr, int ifindex, |
95 | unsigned pref); | |
efa2cea0 DL |
96 | static struct rt6_info *rt6_get_route_info(struct net *net, |
97 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
98 | struct in6_addr *gwaddr, int ifindex); |
99 | #endif | |
100 | ||
9a7ec3a9 | 101 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 LT |
102 | .family = AF_INET6, |
103 | .protocol = __constant_htons(ETH_P_IPV6), | |
104 | .gc = ip6_dst_gc, | |
105 | .gc_thresh = 1024, | |
106 | .check = ip6_dst_check, | |
107 | .destroy = ip6_dst_destroy, | |
108 | .ifdown = ip6_dst_ifdown, | |
109 | .negative_advice = ip6_negative_advice, | |
110 | .link_failure = ip6_link_failure, | |
111 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 112 | .local_out = __ip6_local_out, |
1da177e4 | 113 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 114 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
115 | }; |
116 | ||
14e50e57 DM |
117 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
118 | { | |
119 | } | |
120 | ||
121 | static struct dst_ops ip6_dst_blackhole_ops = { | |
122 | .family = AF_INET6, | |
123 | .protocol = __constant_htons(ETH_P_IPV6), | |
124 | .destroy = ip6_dst_destroy, | |
125 | .check = ip6_dst_check, | |
126 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
127 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 128 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
129 | }; |
130 | ||
bdb3289f | 131 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
132 | .u = { |
133 | .dst = { | |
134 | .__refcnt = ATOMIC_INIT(1), | |
135 | .__use = 1, | |
1da177e4 LT |
136 | .obsolete = -1, |
137 | .error = -ENETUNREACH, | |
138 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
139 | .input = ip6_pkt_discard, | |
140 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
141 | } |
142 | }, | |
143 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
144 | .rt6i_metric = ~(u32) 0, | |
145 | .rt6i_ref = ATOMIC_INIT(1), | |
146 | }; | |
147 | ||
101367c2 TG |
148 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
149 | ||
6723ab54 DM |
150 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
151 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 152 | |
280a34c8 | 153 | static struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
154 | .u = { |
155 | .dst = { | |
156 | .__refcnt = ATOMIC_INIT(1), | |
157 | .__use = 1, | |
101367c2 TG |
158 | .obsolete = -1, |
159 | .error = -EACCES, | |
160 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
161 | .input = ip6_pkt_prohibit, |
162 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
163 | } |
164 | }, | |
165 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
166 | .rt6i_metric = ~(u32) 0, | |
167 | .rt6i_ref = ATOMIC_INIT(1), | |
168 | }; | |
169 | ||
bdb3289f | 170 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
171 | .u = { |
172 | .dst = { | |
173 | .__refcnt = ATOMIC_INIT(1), | |
174 | .__use = 1, | |
101367c2 TG |
175 | .obsolete = -1, |
176 | .error = -EINVAL, | |
177 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
178 | .input = dst_discard, |
179 | .output = dst_discard, | |
101367c2 TG |
180 | } |
181 | }, | |
182 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
183 | .rt6i_metric = ~(u32) 0, | |
184 | .rt6i_ref = ATOMIC_INIT(1), | |
185 | }; | |
186 | ||
187 | #endif | |
188 | ||
1da177e4 | 189 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 190 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 191 | { |
f2fc6a54 | 192 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
193 | } |
194 | ||
195 | static void ip6_dst_destroy(struct dst_entry *dst) | |
196 | { | |
197 | struct rt6_info *rt = (struct rt6_info *)dst; | |
198 | struct inet6_dev *idev = rt->rt6i_idev; | |
199 | ||
200 | if (idev != NULL) { | |
201 | rt->rt6i_idev = NULL; | |
202 | in6_dev_put(idev); | |
1ab1457c | 203 | } |
1da177e4 LT |
204 | } |
205 | ||
206 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
207 | int how) | |
208 | { | |
209 | struct rt6_info *rt = (struct rt6_info *)dst; | |
210 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 211 | struct net_device *loopback_dev = |
c346dca1 | 212 | dev_net(dev)->loopback_dev; |
1da177e4 | 213 | |
5a3e55d6 DL |
214 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
215 | struct inet6_dev *loopback_idev = | |
216 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
217 | if (loopback_idev != NULL) { |
218 | rt->rt6i_idev = loopback_idev; | |
219 | in6_dev_put(idev); | |
220 | } | |
221 | } | |
222 | } | |
223 | ||
224 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
225 | { | |
226 | return (rt->rt6i_flags & RTF_EXPIRES && | |
227 | time_after(jiffies, rt->rt6i_expires)); | |
228 | } | |
229 | ||
c71099ac TG |
230 | static inline int rt6_need_strict(struct in6_addr *daddr) |
231 | { | |
232 | return (ipv6_addr_type(daddr) & | |
233 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
234 | } | |
235 | ||
1da177e4 | 236 | /* |
c71099ac | 237 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
238 | */ |
239 | ||
8ed67789 DL |
240 | static inline struct rt6_info *rt6_device_match(struct net *net, |
241 | struct rt6_info *rt, | |
1da177e4 LT |
242 | int oif, |
243 | int strict) | |
244 | { | |
245 | struct rt6_info *local = NULL; | |
246 | struct rt6_info *sprt; | |
247 | ||
248 | if (oif) { | |
7cc48263 | 249 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
250 | struct net_device *dev = sprt->rt6i_dev; |
251 | if (dev->ifindex == oif) | |
252 | return sprt; | |
253 | if (dev->flags & IFF_LOOPBACK) { | |
254 | if (sprt->rt6i_idev == NULL || | |
255 | sprt->rt6i_idev->dev->ifindex != oif) { | |
256 | if (strict && oif) | |
257 | continue; | |
1ab1457c | 258 | if (local && (!oif || |
1da177e4 LT |
259 | local->rt6i_idev->dev->ifindex == oif)) |
260 | continue; | |
261 | } | |
262 | local = sprt; | |
263 | } | |
264 | } | |
265 | ||
266 | if (local) | |
267 | return local; | |
268 | ||
269 | if (strict) | |
8ed67789 | 270 | return net->ipv6.ip6_null_entry; |
1da177e4 LT |
271 | } |
272 | return rt; | |
273 | } | |
274 | ||
27097255 YH |
275 | #ifdef CONFIG_IPV6_ROUTER_PREF |
276 | static void rt6_probe(struct rt6_info *rt) | |
277 | { | |
278 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
279 | /* | |
280 | * Okay, this does not seem to be appropriate | |
281 | * for now, however, we need to check if it | |
282 | * is really so; aka Router Reachability Probing. | |
283 | * | |
284 | * Router Reachability Probe MUST be rate-limited | |
285 | * to no more than one per minute. | |
286 | */ | |
287 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
288 | return; | |
289 | read_lock_bh(&neigh->lock); | |
290 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 291 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
292 | struct in6_addr mcaddr; |
293 | struct in6_addr *target; | |
294 | ||
295 | neigh->updated = jiffies; | |
296 | read_unlock_bh(&neigh->lock); | |
297 | ||
298 | target = (struct in6_addr *)&neigh->primary_key; | |
299 | addrconf_addr_solict_mult(target, &mcaddr); | |
300 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
301 | } else | |
302 | read_unlock_bh(&neigh->lock); | |
303 | } | |
304 | #else | |
305 | static inline void rt6_probe(struct rt6_info *rt) | |
306 | { | |
307 | return; | |
308 | } | |
309 | #endif | |
310 | ||
1da177e4 | 311 | /* |
554cfb7e | 312 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 313 | */ |
b6f99a21 | 314 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
315 | { |
316 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 317 | if (!oif || dev->ifindex == oif) |
554cfb7e | 318 | return 2; |
161980f4 DM |
319 | if ((dev->flags & IFF_LOOPBACK) && |
320 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
321 | return 1; | |
322 | return 0; | |
554cfb7e | 323 | } |
1da177e4 | 324 | |
b6f99a21 | 325 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 326 | { |
554cfb7e | 327 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 328 | int m; |
4d0c5911 YH |
329 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
330 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
331 | m = 1; | |
332 | else if (neigh) { | |
554cfb7e YH |
333 | read_lock_bh(&neigh->lock); |
334 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 335 | m = 2; |
398bcbeb YH |
336 | #ifdef CONFIG_IPV6_ROUTER_PREF |
337 | else if (neigh->nud_state & NUD_FAILED) | |
338 | m = 0; | |
339 | #endif | |
340 | else | |
ea73ee23 | 341 | m = 1; |
554cfb7e | 342 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
343 | } else |
344 | m = 0; | |
554cfb7e | 345 | return m; |
1da177e4 LT |
346 | } |
347 | ||
554cfb7e YH |
348 | static int rt6_score_route(struct rt6_info *rt, int oif, |
349 | int strict) | |
1da177e4 | 350 | { |
4d0c5911 | 351 | int m, n; |
1ab1457c | 352 | |
4d0c5911 | 353 | m = rt6_check_dev(rt, oif); |
77d16f45 | 354 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 355 | return -1; |
ebacaaa0 YH |
356 | #ifdef CONFIG_IPV6_ROUTER_PREF |
357 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
358 | #endif | |
4d0c5911 | 359 | n = rt6_check_neigh(rt); |
557e92ef | 360 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
361 | return -1; |
362 | return m; | |
363 | } | |
364 | ||
f11e6659 DM |
365 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
366 | int *mpri, struct rt6_info *match) | |
554cfb7e | 367 | { |
f11e6659 DM |
368 | int m; |
369 | ||
370 | if (rt6_check_expired(rt)) | |
371 | goto out; | |
372 | ||
373 | m = rt6_score_route(rt, oif, strict); | |
374 | if (m < 0) | |
375 | goto out; | |
376 | ||
377 | if (m > *mpri) { | |
378 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
379 | rt6_probe(match); | |
380 | *mpri = m; | |
381 | match = rt; | |
382 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
383 | rt6_probe(rt); | |
384 | } | |
385 | ||
386 | out: | |
387 | return match; | |
388 | } | |
389 | ||
390 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
391 | struct rt6_info *rr_head, | |
392 | u32 metric, int oif, int strict) | |
393 | { | |
394 | struct rt6_info *rt, *match; | |
554cfb7e | 395 | int mpri = -1; |
1da177e4 | 396 | |
f11e6659 DM |
397 | match = NULL; |
398 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
399 | rt = rt->u.dst.rt6_next) | |
400 | match = find_match(rt, oif, strict, &mpri, match); | |
401 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
402 | rt = rt->u.dst.rt6_next) | |
403 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 404 | |
f11e6659 DM |
405 | return match; |
406 | } | |
1da177e4 | 407 | |
f11e6659 DM |
408 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
409 | { | |
410 | struct rt6_info *match, *rt0; | |
8ed67789 | 411 | struct net *net; |
1da177e4 | 412 | |
f11e6659 | 413 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 414 | __func__, fn->leaf, oif); |
554cfb7e | 415 | |
f11e6659 DM |
416 | rt0 = fn->rr_ptr; |
417 | if (!rt0) | |
418 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 419 | |
f11e6659 | 420 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 421 | |
554cfb7e | 422 | if (!match && |
f11e6659 DM |
423 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
424 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
425 | ||
554cfb7e | 426 | /* no entries matched; do round-robin */ |
f11e6659 DM |
427 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
428 | next = fn->leaf; | |
429 | ||
430 | if (next != rt0) | |
431 | fn->rr_ptr = next; | |
1da177e4 | 432 | } |
1da177e4 | 433 | |
f11e6659 | 434 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 435 | __func__, match); |
1da177e4 | 436 | |
c346dca1 | 437 | net = dev_net(rt0->rt6i_dev); |
8ed67789 | 438 | return (match ? match : net->ipv6.ip6_null_entry); |
1da177e4 LT |
439 | } |
440 | ||
70ceb4f5 YH |
441 | #ifdef CONFIG_IPV6_ROUTE_INFO |
442 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
443 | struct in6_addr *gwaddr) | |
444 | { | |
c346dca1 | 445 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
446 | struct route_info *rinfo = (struct route_info *) opt; |
447 | struct in6_addr prefix_buf, *prefix; | |
448 | unsigned int pref; | |
449 | u32 lifetime; | |
450 | struct rt6_info *rt; | |
451 | ||
452 | if (len < sizeof(struct route_info)) { | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
456 | /* Sanity check for prefix_len and length */ | |
457 | if (rinfo->length > 3) { | |
458 | return -EINVAL; | |
459 | } else if (rinfo->prefix_len > 128) { | |
460 | return -EINVAL; | |
461 | } else if (rinfo->prefix_len > 64) { | |
462 | if (rinfo->length < 2) { | |
463 | return -EINVAL; | |
464 | } | |
465 | } else if (rinfo->prefix_len > 0) { | |
466 | if (rinfo->length < 1) { | |
467 | return -EINVAL; | |
468 | } | |
469 | } | |
470 | ||
471 | pref = rinfo->route_pref; | |
472 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
473 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
474 | ||
e69a4adc | 475 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
476 | if (lifetime == 0xffffffff) { |
477 | /* infinity */ | |
a3264435 | 478 | } else if (lifetime > 0x7fffffff/HZ - 1) { |
70ceb4f5 YH |
479 | /* Avoid arithmetic overflow */ |
480 | lifetime = 0x7fffffff/HZ - 1; | |
481 | } | |
482 | ||
483 | if (rinfo->length == 3) | |
484 | prefix = (struct in6_addr *)rinfo->prefix; | |
485 | else { | |
486 | /* this function is safe */ | |
487 | ipv6_addr_prefix(&prefix_buf, | |
488 | (struct in6_addr *)rinfo->prefix, | |
489 | rinfo->prefix_len); | |
490 | prefix = &prefix_buf; | |
491 | } | |
492 | ||
efa2cea0 DL |
493 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
494 | dev->ifindex); | |
70ceb4f5 YH |
495 | |
496 | if (rt && !lifetime) { | |
e0a1ad73 | 497 | ip6_del_rt(rt); |
70ceb4f5 YH |
498 | rt = NULL; |
499 | } | |
500 | ||
501 | if (!rt && lifetime) | |
efa2cea0 | 502 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
503 | pref); |
504 | else if (rt) | |
505 | rt->rt6i_flags = RTF_ROUTEINFO | | |
506 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
507 | ||
508 | if (rt) { | |
509 | if (lifetime == 0xffffffff) { | |
510 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
511 | } else { | |
512 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
513 | rt->rt6i_flags |= RTF_EXPIRES; | |
514 | } | |
515 | dst_release(&rt->u.dst); | |
516 | } | |
517 | return 0; | |
518 | } | |
519 | #endif | |
520 | ||
8ed67789 | 521 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 522 | do { \ |
8ed67789 | 523 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 524 | struct fib6_node *pn; \ |
e0eda7bb | 525 | while (1) { \ |
982f56f3 YH |
526 | if (fn->fn_flags & RTN_TL_ROOT) \ |
527 | goto out; \ | |
528 | pn = fn->parent; \ | |
529 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 530 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
531 | else \ |
532 | fn = pn; \ | |
533 | if (fn->fn_flags & RTN_RTINFO) \ | |
534 | goto restart; \ | |
c71099ac | 535 | } \ |
c71099ac | 536 | } \ |
982f56f3 | 537 | } while(0) |
c71099ac | 538 | |
8ed67789 DL |
539 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
540 | struct fib6_table *table, | |
c71099ac | 541 | struct flowi *fl, int flags) |
1da177e4 LT |
542 | { |
543 | struct fib6_node *fn; | |
544 | struct rt6_info *rt; | |
545 | ||
c71099ac TG |
546 | read_lock_bh(&table->tb6_lock); |
547 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
548 | restart: | |
549 | rt = fn->leaf; | |
8ed67789 DL |
550 | rt = rt6_device_match(net, rt, fl->oif, flags); |
551 | BACKTRACK(net, &fl->fl6_src); | |
c71099ac | 552 | out: |
03f49f34 | 553 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 554 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
555 | return rt; |
556 | ||
557 | } | |
558 | ||
9acd9f3a YH |
559 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
560 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
561 | { |
562 | struct flowi fl = { | |
563 | .oif = oif, | |
564 | .nl_u = { | |
565 | .ip6_u = { | |
566 | .daddr = *daddr, | |
c71099ac TG |
567 | }, |
568 | }, | |
569 | }; | |
570 | struct dst_entry *dst; | |
77d16f45 | 571 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 572 | |
adaa70bb TG |
573 | if (saddr) { |
574 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
575 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
576 | } | |
577 | ||
606a2b48 | 578 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
579 | if (dst->error == 0) |
580 | return (struct rt6_info *) dst; | |
581 | ||
582 | dst_release(dst); | |
583 | ||
1da177e4 LT |
584 | return NULL; |
585 | } | |
586 | ||
7159039a YH |
587 | EXPORT_SYMBOL(rt6_lookup); |
588 | ||
c71099ac | 589 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
590 | It takes new route entry, the addition fails by any reason the |
591 | route is freed. In any case, if caller does not hold it, it may | |
592 | be destroyed. | |
593 | */ | |
594 | ||
86872cb5 | 595 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
596 | { |
597 | int err; | |
c71099ac | 598 | struct fib6_table *table; |
1da177e4 | 599 | |
c71099ac TG |
600 | table = rt->rt6i_table; |
601 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 602 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 603 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
604 | |
605 | return err; | |
606 | } | |
607 | ||
40e22e8f TG |
608 | int ip6_ins_rt(struct rt6_info *rt) |
609 | { | |
4d1169c1 | 610 | struct nl_info info = { |
c346dca1 | 611 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 612 | }; |
528c4ceb | 613 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
614 | } |
615 | ||
95a9a5ba YH |
616 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
617 | struct in6_addr *saddr) | |
1da177e4 | 618 | { |
1da177e4 LT |
619 | struct rt6_info *rt; |
620 | ||
621 | /* | |
622 | * Clone the route. | |
623 | */ | |
624 | ||
625 | rt = ip6_rt_copy(ort); | |
626 | ||
627 | if (rt) { | |
58c4fb86 YH |
628 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
629 | if (rt->rt6i_dst.plen != 128 && | |
630 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
631 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 632 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 633 | } |
1da177e4 | 634 | |
58c4fb86 | 635 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
636 | rt->rt6i_dst.plen = 128; |
637 | rt->rt6i_flags |= RTF_CACHE; | |
638 | rt->u.dst.flags |= DST_HOST; | |
639 | ||
640 | #ifdef CONFIG_IPV6_SUBTREES | |
641 | if (rt->rt6i_src.plen && saddr) { | |
642 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
643 | rt->rt6i_src.plen = 128; | |
644 | } | |
645 | #endif | |
646 | ||
647 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
648 | ||
95a9a5ba | 649 | } |
1da177e4 | 650 | |
95a9a5ba YH |
651 | return rt; |
652 | } | |
1da177e4 | 653 | |
299d9939 YH |
654 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
655 | { | |
656 | struct rt6_info *rt = ip6_rt_copy(ort); | |
657 | if (rt) { | |
658 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
659 | rt->rt6i_dst.plen = 128; | |
660 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
661 | rt->u.dst.flags |= DST_HOST; |
662 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
663 | } | |
664 | return rt; | |
665 | } | |
666 | ||
8ed67789 DL |
667 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
668 | struct flowi *fl, int flags) | |
1da177e4 LT |
669 | { |
670 | struct fib6_node *fn; | |
519fbd87 | 671 | struct rt6_info *rt, *nrt; |
c71099ac | 672 | int strict = 0; |
1da177e4 | 673 | int attempts = 3; |
519fbd87 | 674 | int err; |
ea659e07 | 675 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 676 | |
77d16f45 | 677 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
678 | |
679 | relookup: | |
c71099ac | 680 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 681 | |
8238dd06 | 682 | restart_2: |
c71099ac | 683 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
684 | |
685 | restart: | |
4acad72d | 686 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
687 | |
688 | BACKTRACK(net, &fl->fl6_src); | |
689 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 690 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 691 | goto out; |
1da177e4 | 692 | |
fb9de91e | 693 | dst_hold(&rt->u.dst); |
c71099ac | 694 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 695 | |
519fbd87 | 696 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 697 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
698 | else { |
699 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 700 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
701 | #else |
702 | goto out2; | |
703 | #endif | |
704 | } | |
e40cf353 | 705 | |
519fbd87 | 706 | dst_release(&rt->u.dst); |
8ed67789 | 707 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 708 | |
519fbd87 YH |
709 | dst_hold(&rt->u.dst); |
710 | if (nrt) { | |
40e22e8f | 711 | err = ip6_ins_rt(nrt); |
519fbd87 | 712 | if (!err) |
1da177e4 | 713 | goto out2; |
1da177e4 | 714 | } |
1da177e4 | 715 | |
519fbd87 YH |
716 | if (--attempts <= 0) |
717 | goto out2; | |
718 | ||
719 | /* | |
c71099ac | 720 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
721 | * released someone could insert this route. Relookup. |
722 | */ | |
723 | dst_release(&rt->u.dst); | |
724 | goto relookup; | |
725 | ||
726 | out: | |
8238dd06 YH |
727 | if (reachable) { |
728 | reachable = 0; | |
729 | goto restart_2; | |
730 | } | |
519fbd87 | 731 | dst_hold(&rt->u.dst); |
c71099ac | 732 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
733 | out2: |
734 | rt->u.dst.lastuse = jiffies; | |
735 | rt->u.dst.__use++; | |
c71099ac TG |
736 | |
737 | return rt; | |
1da177e4 LT |
738 | } |
739 | ||
8ed67789 | 740 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
741 | struct flowi *fl, int flags) |
742 | { | |
8ed67789 | 743 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
744 | } |
745 | ||
c71099ac TG |
746 | void ip6_route_input(struct sk_buff *skb) |
747 | { | |
0660e03f | 748 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 749 | struct net *net = dev_net(skb->dev); |
adaa70bb | 750 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
751 | struct flowi fl = { |
752 | .iif = skb->dev->ifindex, | |
753 | .nl_u = { | |
754 | .ip6_u = { | |
755 | .daddr = iph->daddr, | |
756 | .saddr = iph->saddr, | |
90bcaf7b | 757 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
758 | }, |
759 | }, | |
1ab1457c | 760 | .mark = skb->mark, |
c71099ac TG |
761 | .proto = iph->nexthdr, |
762 | }; | |
adaa70bb TG |
763 | |
764 | if (rt6_need_strict(&iph->daddr)) | |
765 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 766 | |
5578689a | 767 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
768 | } |
769 | ||
8ed67789 | 770 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 771 | struct flowi *fl, int flags) |
1da177e4 | 772 | { |
8ed67789 | 773 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
774 | } |
775 | ||
4591db4f DL |
776 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
777 | struct flowi *fl) | |
c71099ac TG |
778 | { |
779 | int flags = 0; | |
780 | ||
781 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 782 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 783 | |
adaa70bb TG |
784 | if (!ipv6_addr_any(&fl->fl6_src)) |
785 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
7cbca67c YH |
786 | else if (sk) { |
787 | unsigned int prefs = inet6_sk(sk)->srcprefs; | |
788 | if (prefs & IPV6_PREFER_SRC_TMP) | |
789 | flags |= RT6_LOOKUP_F_SRCPREF_TMP; | |
790 | if (prefs & IPV6_PREFER_SRC_PUBLIC) | |
791 | flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC; | |
792 | if (prefs & IPV6_PREFER_SRC_COA) | |
793 | flags |= RT6_LOOKUP_F_SRCPREF_COA; | |
794 | } | |
adaa70bb | 795 | |
4591db4f | 796 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
797 | } |
798 | ||
7159039a | 799 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 800 | |
14e50e57 DM |
801 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
802 | { | |
803 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
804 | struct rt6_info *rt = (struct rt6_info *) | |
805 | dst_alloc(&ip6_dst_blackhole_ops); | |
806 | struct dst_entry *new = NULL; | |
807 | ||
808 | if (rt) { | |
809 | new = &rt->u.dst; | |
810 | ||
811 | atomic_set(&new->__refcnt, 1); | |
812 | new->__use = 1; | |
352e512c HX |
813 | new->input = dst_discard; |
814 | new->output = dst_discard; | |
14e50e57 DM |
815 | |
816 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
817 | new->dev = ort->u.dst.dev; | |
818 | if (new->dev) | |
819 | dev_hold(new->dev); | |
820 | rt->rt6i_idev = ort->rt6i_idev; | |
821 | if (rt->rt6i_idev) | |
822 | in6_dev_hold(rt->rt6i_idev); | |
823 | rt->rt6i_expires = 0; | |
824 | ||
825 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
826 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
827 | rt->rt6i_metric = 0; | |
828 | ||
829 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
830 | #ifdef CONFIG_IPV6_SUBTREES | |
831 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
832 | #endif | |
833 | ||
834 | dst_free(new); | |
835 | } | |
836 | ||
837 | dst_release(*dstp); | |
838 | *dstp = new; | |
839 | return (new ? 0 : -ENOMEM); | |
840 | } | |
841 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
842 | ||
1da177e4 LT |
843 | /* |
844 | * Destination cache support functions | |
845 | */ | |
846 | ||
847 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
848 | { | |
849 | struct rt6_info *rt; | |
850 | ||
851 | rt = (struct rt6_info *) dst; | |
852 | ||
853 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
854 | return dst; | |
855 | ||
856 | return NULL; | |
857 | } | |
858 | ||
859 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
860 | { | |
861 | struct rt6_info *rt = (struct rt6_info *) dst; | |
862 | ||
863 | if (rt) { | |
864 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 865 | ip6_del_rt(rt); |
1da177e4 LT |
866 | else |
867 | dst_release(dst); | |
868 | } | |
869 | return NULL; | |
870 | } | |
871 | ||
872 | static void ip6_link_failure(struct sk_buff *skb) | |
873 | { | |
874 | struct rt6_info *rt; | |
875 | ||
876 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
877 | ||
878 | rt = (struct rt6_info *) skb->dst; | |
879 | if (rt) { | |
880 | if (rt->rt6i_flags&RTF_CACHE) { | |
881 | dst_set_expires(&rt->u.dst, 0); | |
882 | rt->rt6i_flags |= RTF_EXPIRES; | |
883 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
884 | rt->rt6i_node->fn_sernum = -1; | |
885 | } | |
886 | } | |
887 | ||
888 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
889 | { | |
890 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
891 | ||
892 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
893 | rt6->rt6i_flags |= RTF_MODIFIED; | |
894 | if (mtu < IPV6_MIN_MTU) { | |
895 | mtu = IPV6_MIN_MTU; | |
896 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
897 | } | |
898 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 899 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
900 | } |
901 | } | |
902 | ||
1da177e4 LT |
903 | static int ipv6_get_mtu(struct net_device *dev); |
904 | ||
5578689a | 905 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
906 | { |
907 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
908 | ||
5578689a DL |
909 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
910 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
911 | |
912 | /* | |
1ab1457c YH |
913 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
914 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
915 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
916 | * rely only on pmtu discovery" |
917 | */ | |
918 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
919 | mtu = IPV6_MAXPLEN; | |
920 | return mtu; | |
921 | } | |
922 | ||
3b00944c YH |
923 | static struct dst_entry *icmp6_dst_gc_list; |
924 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 925 | |
3b00944c | 926 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 927 | struct neighbour *neigh, |
9acd9f3a | 928 | const struct in6_addr *addr) |
1da177e4 LT |
929 | { |
930 | struct rt6_info *rt; | |
931 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 932 | struct net *net = dev_net(dev); |
1da177e4 LT |
933 | |
934 | if (unlikely(idev == NULL)) | |
935 | return NULL; | |
936 | ||
f2fc6a54 | 937 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
938 | if (unlikely(rt == NULL)) { |
939 | in6_dev_put(idev); | |
940 | goto out; | |
941 | } | |
942 | ||
943 | dev_hold(dev); | |
944 | if (neigh) | |
945 | neigh_hold(neigh); | |
946 | else | |
947 | neigh = ndisc_get_neigh(dev, addr); | |
948 | ||
949 | rt->rt6i_dev = dev; | |
950 | rt->rt6i_idev = idev; | |
951 | rt->rt6i_nexthop = neigh; | |
952 | atomic_set(&rt->u.dst.__refcnt, 1); | |
953 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
954 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 955 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 956 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
957 | |
958 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
959 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
960 | ? DST_HOST | |
1da177e4 LT |
961 | : 0; |
962 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
963 | rt->rt6i_dst.plen = 128; | |
964 | #endif | |
965 | ||
3b00944c YH |
966 | spin_lock_bh(&icmp6_dst_lock); |
967 | rt->u.dst.next = icmp6_dst_gc_list; | |
968 | icmp6_dst_gc_list = &rt->u.dst; | |
969 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 970 | |
5578689a | 971 | fib6_force_start_gc(net); |
1da177e4 LT |
972 | |
973 | out: | |
40aa7b90 | 974 | return &rt->u.dst; |
1da177e4 LT |
975 | } |
976 | ||
3b00944c | 977 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
978 | { |
979 | struct dst_entry *dst, *next, **pprev; | |
980 | int freed; | |
981 | ||
982 | next = NULL; | |
1ab1457c | 983 | freed = 0; |
5d0bbeeb | 984 | |
3b00944c YH |
985 | spin_lock_bh(&icmp6_dst_lock); |
986 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 987 | |
1da177e4 LT |
988 | while ((dst = *pprev) != NULL) { |
989 | if (!atomic_read(&dst->__refcnt)) { | |
990 | *pprev = dst->next; | |
991 | dst_free(dst); | |
992 | freed++; | |
993 | } else { | |
994 | pprev = &dst->next; | |
995 | (*more)++; | |
996 | } | |
997 | } | |
998 | ||
3b00944c | 999 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1000 | |
1da177e4 LT |
1001 | return freed; |
1002 | } | |
1003 | ||
569d3645 | 1004 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1005 | { |
1da177e4 | 1006 | unsigned long now = jiffies; |
7019b78e DL |
1007 | struct net *net = ops->dst_net; |
1008 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
1009 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1010 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1011 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1012 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1013 | ||
1014 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1015 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1016 | goto out; |
1017 | ||
6891a346 BT |
1018 | net->ipv6.ip6_rt_gc_expire++; |
1019 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1020 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1021 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1022 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1023 | out: |
7019b78e DL |
1024 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1025 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1026 | } |
1027 | ||
1028 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1029 | but results in cleaner routing tables. | |
1030 | ||
1031 | Remove it only when all the things will work! | |
1032 | */ | |
1033 | ||
1034 | static int ipv6_get_mtu(struct net_device *dev) | |
1035 | { | |
1036 | int mtu = IPV6_MIN_MTU; | |
1037 | struct inet6_dev *idev; | |
1038 | ||
1039 | idev = in6_dev_get(dev); | |
1040 | if (idev) { | |
1041 | mtu = idev->cnf.mtu6; | |
1042 | in6_dev_put(idev); | |
1043 | } | |
1044 | return mtu; | |
1045 | } | |
1046 | ||
6b75d090 | 1047 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1048 | { |
6b75d090 YH |
1049 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1050 | if (hoplimit < 0) { | |
1051 | struct net_device *dev = dst->dev; | |
1052 | struct inet6_dev *idev = in6_dev_get(dev); | |
1053 | if (idev) { | |
1054 | hoplimit = idev->cnf.hop_limit; | |
1055 | in6_dev_put(idev); | |
1056 | } else | |
1057 | hoplimit = ipv6_devconf.hop_limit; | |
1da177e4 LT |
1058 | } |
1059 | return hoplimit; | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * | |
1064 | */ | |
1065 | ||
86872cb5 | 1066 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1067 | { |
1068 | int err; | |
5578689a | 1069 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1070 | struct rt6_info *rt = NULL; |
1071 | struct net_device *dev = NULL; | |
1072 | struct inet6_dev *idev = NULL; | |
c71099ac | 1073 | struct fib6_table *table; |
1da177e4 LT |
1074 | int addr_type; |
1075 | ||
86872cb5 | 1076 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1077 | return -EINVAL; |
1078 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1079 | if (cfg->fc_src_len) |
1da177e4 LT |
1080 | return -EINVAL; |
1081 | #endif | |
86872cb5 | 1082 | if (cfg->fc_ifindex) { |
1da177e4 | 1083 | err = -ENODEV; |
5578689a | 1084 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1085 | if (!dev) |
1086 | goto out; | |
1087 | idev = in6_dev_get(dev); | |
1088 | if (!idev) | |
1089 | goto out; | |
1090 | } | |
1091 | ||
86872cb5 TG |
1092 | if (cfg->fc_metric == 0) |
1093 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1094 | |
5578689a | 1095 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1096 | if (table == NULL) { |
1097 | err = -ENOBUFS; | |
1098 | goto out; | |
1099 | } | |
1100 | ||
f2fc6a54 | 1101 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1102 | |
1103 | if (rt == NULL) { | |
1104 | err = -ENOMEM; | |
1105 | goto out; | |
1106 | } | |
1107 | ||
1108 | rt->u.dst.obsolete = -1; | |
6f704992 YH |
1109 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1110 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1111 | 0; | |
1da177e4 | 1112 | |
86872cb5 TG |
1113 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1114 | cfg->fc_protocol = RTPROT_BOOT; | |
1115 | rt->rt6i_protocol = cfg->fc_protocol; | |
1116 | ||
1117 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1118 | |
1119 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1120 | rt->u.dst.input = ip6_mc_input; | |
1121 | else | |
1122 | rt->u.dst.input = ip6_forward; | |
1123 | ||
1124 | rt->u.dst.output = ip6_output; | |
1125 | ||
86872cb5 TG |
1126 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1127 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1128 | if (rt->rt6i_dst.plen == 128) |
1129 | rt->u.dst.flags = DST_HOST; | |
1130 | ||
1131 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1132 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1133 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1134 | #endif |
1135 | ||
86872cb5 | 1136 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1137 | |
1138 | /* We cannot add true routes via loopback here, | |
1139 | they would result in kernel looping; promote them to reject routes | |
1140 | */ | |
86872cb5 | 1141 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1142 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1143 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1144 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1145 | if (dev) { |
1146 | dev_put(dev); | |
1147 | in6_dev_put(idev); | |
1148 | } | |
5578689a | 1149 | dev = net->loopback_dev; |
1da177e4 LT |
1150 | dev_hold(dev); |
1151 | idev = in6_dev_get(dev); | |
1152 | if (!idev) { | |
1153 | err = -ENODEV; | |
1154 | goto out; | |
1155 | } | |
1156 | } | |
1157 | rt->u.dst.output = ip6_pkt_discard_out; | |
1158 | rt->u.dst.input = ip6_pkt_discard; | |
1159 | rt->u.dst.error = -ENETUNREACH; | |
1160 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1161 | goto install_route; | |
1162 | } | |
1163 | ||
86872cb5 | 1164 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1165 | struct in6_addr *gw_addr; |
1166 | int gwa_type; | |
1167 | ||
86872cb5 TG |
1168 | gw_addr = &cfg->fc_gateway; |
1169 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1170 | gwa_type = ipv6_addr_type(gw_addr); |
1171 | ||
1172 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1173 | struct rt6_info *grt; | |
1174 | ||
1175 | /* IPv6 strictly inhibits using not link-local | |
1176 | addresses as nexthop address. | |
1177 | Otherwise, router will not able to send redirects. | |
1178 | It is very good, but in some (rare!) circumstances | |
1179 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1180 | some exceptions. --ANK | |
1181 | */ | |
1182 | err = -EINVAL; | |
1183 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1184 | goto out; | |
1185 | ||
5578689a | 1186 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1187 | |
1188 | err = -EHOSTUNREACH; | |
1189 | if (grt == NULL) | |
1190 | goto out; | |
1191 | if (dev) { | |
1192 | if (dev != grt->rt6i_dev) { | |
1193 | dst_release(&grt->u.dst); | |
1194 | goto out; | |
1195 | } | |
1196 | } else { | |
1197 | dev = grt->rt6i_dev; | |
1198 | idev = grt->rt6i_idev; | |
1199 | dev_hold(dev); | |
1200 | in6_dev_hold(grt->rt6i_idev); | |
1201 | } | |
1202 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1203 | err = 0; | |
1204 | dst_release(&grt->u.dst); | |
1205 | ||
1206 | if (err) | |
1207 | goto out; | |
1208 | } | |
1209 | err = -EINVAL; | |
1210 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1211 | goto out; | |
1212 | } | |
1213 | ||
1214 | err = -ENODEV; | |
1215 | if (dev == NULL) | |
1216 | goto out; | |
1217 | ||
86872cb5 | 1218 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1219 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1220 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1221 | err = PTR_ERR(rt->rt6i_nexthop); | |
1222 | rt->rt6i_nexthop = NULL; | |
1223 | goto out; | |
1224 | } | |
1225 | } | |
1226 | ||
86872cb5 | 1227 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1228 | |
1229 | install_route: | |
86872cb5 TG |
1230 | if (cfg->fc_mx) { |
1231 | struct nlattr *nla; | |
1232 | int remaining; | |
1233 | ||
1234 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1235 | int type = nla_type(nla); |
86872cb5 TG |
1236 | |
1237 | if (type) { | |
1238 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1239 | err = -EINVAL; |
1240 | goto out; | |
1241 | } | |
86872cb5 TG |
1242 | |
1243 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1244 | } |
1da177e4 LT |
1245 | } |
1246 | } | |
1247 | ||
5ffc02a1 | 1248 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1249 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
5ffc02a1 | 1250 | if (!dst_metric(&rt->u.dst, RTAX_MTU)) |
1da177e4 | 1251 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
5ffc02a1 | 1252 | if (!dst_metric(&rt->u.dst, RTAX_ADVMSS)) |
5578689a | 1253 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1254 | rt->u.dst.dev = dev; |
1255 | rt->rt6i_idev = idev; | |
c71099ac | 1256 | rt->rt6i_table = table; |
63152fc0 | 1257 | |
c346dca1 | 1258 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1259 | |
86872cb5 | 1260 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1261 | |
1262 | out: | |
1263 | if (dev) | |
1264 | dev_put(dev); | |
1265 | if (idev) | |
1266 | in6_dev_put(idev); | |
1267 | if (rt) | |
40aa7b90 | 1268 | dst_free(&rt->u.dst); |
1da177e4 LT |
1269 | return err; |
1270 | } | |
1271 | ||
86872cb5 | 1272 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1273 | { |
1274 | int err; | |
c71099ac | 1275 | struct fib6_table *table; |
c346dca1 | 1276 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1277 | |
8ed67789 | 1278 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1279 | return -ENOENT; |
1280 | ||
c71099ac TG |
1281 | table = rt->rt6i_table; |
1282 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1283 | |
86872cb5 | 1284 | err = fib6_del(rt, info); |
1da177e4 LT |
1285 | dst_release(&rt->u.dst); |
1286 | ||
c71099ac | 1287 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1288 | |
1289 | return err; | |
1290 | } | |
1291 | ||
e0a1ad73 TG |
1292 | int ip6_del_rt(struct rt6_info *rt) |
1293 | { | |
4d1169c1 | 1294 | struct nl_info info = { |
c346dca1 | 1295 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1296 | }; |
528c4ceb | 1297 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1298 | } |
1299 | ||
86872cb5 | 1300 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1301 | { |
c71099ac | 1302 | struct fib6_table *table; |
1da177e4 LT |
1303 | struct fib6_node *fn; |
1304 | struct rt6_info *rt; | |
1305 | int err = -ESRCH; | |
1306 | ||
5578689a | 1307 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1308 | if (table == NULL) |
1309 | return err; | |
1310 | ||
1311 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1312 | |
c71099ac | 1313 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1314 | &cfg->fc_dst, cfg->fc_dst_len, |
1315 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1316 | |
1da177e4 | 1317 | if (fn) { |
7cc48263 | 1318 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1319 | if (cfg->fc_ifindex && |
1da177e4 | 1320 | (rt->rt6i_dev == NULL || |
86872cb5 | 1321 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1322 | continue; |
86872cb5 TG |
1323 | if (cfg->fc_flags & RTF_GATEWAY && |
1324 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1325 | continue; |
86872cb5 | 1326 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1327 | continue; |
1328 | dst_hold(&rt->u.dst); | |
c71099ac | 1329 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1330 | |
86872cb5 | 1331 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1332 | } |
1333 | } | |
c71099ac | 1334 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1335 | |
1336 | return err; | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Handle redirects | |
1341 | */ | |
a6279458 YH |
1342 | struct ip6rd_flowi { |
1343 | struct flowi fl; | |
1344 | struct in6_addr gateway; | |
1345 | }; | |
1346 | ||
8ed67789 DL |
1347 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1348 | struct fib6_table *table, | |
a6279458 YH |
1349 | struct flowi *fl, |
1350 | int flags) | |
1da177e4 | 1351 | { |
a6279458 YH |
1352 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1353 | struct rt6_info *rt; | |
e843b9e1 | 1354 | struct fib6_node *fn; |
c71099ac | 1355 | |
1da177e4 | 1356 | /* |
e843b9e1 YH |
1357 | * Get the "current" route for this destination and |
1358 | * check if the redirect has come from approriate router. | |
1359 | * | |
1360 | * RFC 2461 specifies that redirects should only be | |
1361 | * accepted if they come from the nexthop to the target. | |
1362 | * Due to the way the routes are chosen, this notion | |
1363 | * is a bit fuzzy and one might need to check all possible | |
1364 | * routes. | |
1da177e4 | 1365 | */ |
1da177e4 | 1366 | |
c71099ac | 1367 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1368 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1369 | restart: |
7cc48263 | 1370 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1371 | /* |
1372 | * Current route is on-link; redirect is always invalid. | |
1373 | * | |
1374 | * Seems, previous statement is not true. It could | |
1375 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1376 | * But then router serving it might decide, that we should | |
1377 | * know truth 8)8) --ANK (980726). | |
1378 | */ | |
1379 | if (rt6_check_expired(rt)) | |
1380 | continue; | |
1381 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1382 | continue; | |
a6279458 | 1383 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1384 | continue; |
a6279458 | 1385 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1386 | continue; |
1387 | break; | |
1388 | } | |
a6279458 | 1389 | |
cb15d9c2 | 1390 | if (!rt) |
8ed67789 DL |
1391 | rt = net->ipv6.ip6_null_entry; |
1392 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1393 | out: |
a6279458 YH |
1394 | dst_hold(&rt->u.dst); |
1395 | ||
c71099ac | 1396 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1397 | |
a6279458 YH |
1398 | return rt; |
1399 | }; | |
1400 | ||
1401 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1402 | struct in6_addr *src, | |
1403 | struct in6_addr *gateway, | |
1404 | struct net_device *dev) | |
1405 | { | |
adaa70bb | 1406 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1407 | struct net *net = dev_net(dev); |
a6279458 YH |
1408 | struct ip6rd_flowi rdfl = { |
1409 | .fl = { | |
1410 | .oif = dev->ifindex, | |
1411 | .nl_u = { | |
1412 | .ip6_u = { | |
1413 | .daddr = *dest, | |
1414 | .saddr = *src, | |
1415 | }, | |
1416 | }, | |
1417 | }, | |
1418 | .gateway = *gateway, | |
1419 | }; | |
adaa70bb TG |
1420 | |
1421 | if (rt6_need_strict(dest)) | |
1422 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1423 | |
5578689a | 1424 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1425 | flags, __ip6_route_redirect); |
a6279458 YH |
1426 | } |
1427 | ||
1428 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1429 | struct in6_addr *saddr, | |
1430 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1431 | { | |
1432 | struct rt6_info *rt, *nrt = NULL; | |
1433 | struct netevent_redirect netevent; | |
c346dca1 | 1434 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1435 | |
1436 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1437 | ||
8ed67789 | 1438 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1439 | if (net_ratelimit()) |
1440 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1441 | "for redirect target\n"); | |
a6279458 | 1442 | goto out; |
1da177e4 LT |
1443 | } |
1444 | ||
1da177e4 LT |
1445 | /* |
1446 | * We have finally decided to accept it. | |
1447 | */ | |
1448 | ||
1ab1457c | 1449 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1450 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1451 | NEIGH_UPDATE_F_OVERRIDE| | |
1452 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1453 | NEIGH_UPDATE_F_ISROUTER)) | |
1454 | ); | |
1455 | ||
1456 | /* | |
1457 | * Redirect received -> path was valid. | |
1458 | * Look, redirects are sent only in response to data packets, | |
1459 | * so that this nexthop apparently is reachable. --ANK | |
1460 | */ | |
1461 | dst_confirm(&rt->u.dst); | |
1462 | ||
1463 | /* Duplicate redirect: silently ignore. */ | |
1464 | if (neigh == rt->u.dst.neighbour) | |
1465 | goto out; | |
1466 | ||
1467 | nrt = ip6_rt_copy(rt); | |
1468 | if (nrt == NULL) | |
1469 | goto out; | |
1470 | ||
1471 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1472 | if (on_link) | |
1473 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1474 | ||
1475 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1476 | nrt->rt6i_dst.plen = 128; | |
1477 | nrt->u.dst.flags |= DST_HOST; | |
1478 | ||
1479 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1480 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1481 | /* Reset pmtu, it may be better */ | |
1482 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
c346dca1 | 1483 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), |
5578689a | 1484 | dst_mtu(&nrt->u.dst)); |
1da177e4 | 1485 | |
40e22e8f | 1486 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1487 | goto out; |
1488 | ||
8d71740c TT |
1489 | netevent.old = &rt->u.dst; |
1490 | netevent.new = &nrt->u.dst; | |
1491 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1492 | ||
1da177e4 | 1493 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1494 | ip6_del_rt(rt); |
1da177e4 LT |
1495 | return; |
1496 | } | |
1497 | ||
1498 | out: | |
1ab1457c | 1499 | dst_release(&rt->u.dst); |
1da177e4 LT |
1500 | return; |
1501 | } | |
1502 | ||
1503 | /* | |
1504 | * Handle ICMP "packet too big" messages | |
1505 | * i.e. Path MTU discovery | |
1506 | */ | |
1507 | ||
1508 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1509 | struct net_device *dev, u32 pmtu) | |
1510 | { | |
1511 | struct rt6_info *rt, *nrt; | |
c346dca1 | 1512 | struct net *net = dev_net(dev); |
1da177e4 LT |
1513 | int allfrag = 0; |
1514 | ||
5578689a | 1515 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1516 | if (rt == NULL) |
1517 | return; | |
1518 | ||
1519 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1520 | goto out; | |
1521 | ||
1522 | if (pmtu < IPV6_MIN_MTU) { | |
1523 | /* | |
1ab1457c | 1524 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1525 | * MTU (1280) and a fragment header should always be included |
1526 | * after a node receiving Too Big message reporting PMTU is | |
1527 | * less than the IPv6 Minimum Link MTU. | |
1528 | */ | |
1529 | pmtu = IPV6_MIN_MTU; | |
1530 | allfrag = 1; | |
1531 | } | |
1532 | ||
1533 | /* New mtu received -> path was valid. | |
1534 | They are sent only in response to data packets, | |
1535 | so that this nexthop apparently is reachable. --ANK | |
1536 | */ | |
1537 | dst_confirm(&rt->u.dst); | |
1538 | ||
1539 | /* Host route. If it is static, it would be better | |
1540 | not to override it, but add new one, so that | |
1541 | when cache entry will expire old pmtu | |
1542 | would return automatically. | |
1543 | */ | |
1544 | if (rt->rt6i_flags & RTF_CACHE) { | |
1545 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1546 | if (allfrag) | |
1547 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1548 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1549 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1550 | goto out; | |
1551 | } | |
1552 | ||
1553 | /* Network route. | |
1554 | Two cases are possible: | |
1555 | 1. It is connected route. Action: COW | |
1556 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1557 | */ | |
d5315b50 | 1558 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1559 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1560 | else |
1561 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1562 | |
d5315b50 | 1563 | if (nrt) { |
a1e78363 YH |
1564 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1565 | if (allfrag) | |
1566 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1567 | ||
1568 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1569 | * happened within 5 mins, the recommended timer is 10 mins. | |
1570 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1571 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1572 | * and detecting PMTU increase will be automatically happened. | |
1573 | */ | |
5578689a | 1574 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1575 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1576 | ||
40e22e8f | 1577 | ip6_ins_rt(nrt); |
1da177e4 | 1578 | } |
1da177e4 LT |
1579 | out: |
1580 | dst_release(&rt->u.dst); | |
1581 | } | |
1582 | ||
1583 | /* | |
1584 | * Misc support functions | |
1585 | */ | |
1586 | ||
1587 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1588 | { | |
c346dca1 | 1589 | struct net *net = dev_net(ort->rt6i_dev); |
f2fc6a54 | 1590 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1591 | |
1592 | if (rt) { | |
1593 | rt->u.dst.input = ort->u.dst.input; | |
1594 | rt->u.dst.output = ort->u.dst.output; | |
1595 | ||
1596 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1597 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1598 | rt->u.dst.dev = ort->u.dst.dev; |
1599 | if (rt->u.dst.dev) | |
1600 | dev_hold(rt->u.dst.dev); | |
1601 | rt->rt6i_idev = ort->rt6i_idev; | |
1602 | if (rt->rt6i_idev) | |
1603 | in6_dev_hold(rt->rt6i_idev); | |
1604 | rt->u.dst.lastuse = jiffies; | |
1605 | rt->rt6i_expires = 0; | |
1606 | ||
1607 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1608 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1609 | rt->rt6i_metric = 0; | |
1610 | ||
1611 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1612 | #ifdef CONFIG_IPV6_SUBTREES | |
1613 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1614 | #endif | |
c71099ac | 1615 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1616 | } |
1617 | return rt; | |
1618 | } | |
1619 | ||
70ceb4f5 | 1620 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1621 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1622 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1623 | struct in6_addr *gwaddr, int ifindex) |
1624 | { | |
1625 | struct fib6_node *fn; | |
1626 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1627 | struct fib6_table *table; |
1628 | ||
efa2cea0 | 1629 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1630 | if (table == NULL) |
1631 | return NULL; | |
70ceb4f5 | 1632 | |
c71099ac TG |
1633 | write_lock_bh(&table->tb6_lock); |
1634 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1635 | if (!fn) |
1636 | goto out; | |
1637 | ||
7cc48263 | 1638 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1639 | if (rt->rt6i_dev->ifindex != ifindex) |
1640 | continue; | |
1641 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1642 | continue; | |
1643 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1644 | continue; | |
1645 | dst_hold(&rt->u.dst); | |
1646 | break; | |
1647 | } | |
1648 | out: | |
c71099ac | 1649 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1650 | return rt; |
1651 | } | |
1652 | ||
efa2cea0 DL |
1653 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1654 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1655 | struct in6_addr *gwaddr, int ifindex, |
1656 | unsigned pref) | |
1657 | { | |
86872cb5 TG |
1658 | struct fib6_config cfg = { |
1659 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1660 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1661 | .fc_ifindex = ifindex, |
1662 | .fc_dst_len = prefixlen, | |
1663 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1664 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1665 | .fc_nlinfo.pid = 0, |
1666 | .fc_nlinfo.nlh = NULL, | |
1667 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1668 | }; |
1669 | ||
1670 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1671 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1672 | |
e317da96 YH |
1673 | /* We should treat it as a default route if prefix length is 0. */ |
1674 | if (!prefixlen) | |
86872cb5 | 1675 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1676 | |
86872cb5 | 1677 | ip6_route_add(&cfg); |
70ceb4f5 | 1678 | |
efa2cea0 | 1679 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1680 | } |
1681 | #endif | |
1682 | ||
1da177e4 | 1683 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1684 | { |
1da177e4 | 1685 | struct rt6_info *rt; |
c71099ac | 1686 | struct fib6_table *table; |
1da177e4 | 1687 | |
c346dca1 | 1688 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1689 | if (table == NULL) |
1690 | return NULL; | |
1da177e4 | 1691 | |
c71099ac | 1692 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1693 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1694 | if (dev == rt->rt6i_dev && |
045927ff | 1695 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1696 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1697 | break; | |
1698 | } | |
1699 | if (rt) | |
1700 | dst_hold(&rt->u.dst); | |
c71099ac | 1701 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1702 | return rt; |
1703 | } | |
1704 | ||
1705 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1706 | struct net_device *dev, |
1707 | unsigned int pref) | |
1da177e4 | 1708 | { |
86872cb5 TG |
1709 | struct fib6_config cfg = { |
1710 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1711 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1712 | .fc_ifindex = dev->ifindex, |
1713 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1714 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1715 | .fc_nlinfo.pid = 0, |
1716 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1717 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1718 | }; |
1da177e4 | 1719 | |
86872cb5 | 1720 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1721 | |
86872cb5 | 1722 | ip6_route_add(&cfg); |
1da177e4 | 1723 | |
1da177e4 LT |
1724 | return rt6_get_dflt_router(gwaddr, dev); |
1725 | } | |
1726 | ||
7b4da532 | 1727 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1728 | { |
1729 | struct rt6_info *rt; | |
c71099ac TG |
1730 | struct fib6_table *table; |
1731 | ||
1732 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1733 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1734 | if (table == NULL) |
1735 | return; | |
1da177e4 LT |
1736 | |
1737 | restart: | |
c71099ac | 1738 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1739 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1740 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1741 | dst_hold(&rt->u.dst); | |
c71099ac | 1742 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1743 | ip6_del_rt(rt); |
1da177e4 LT |
1744 | goto restart; |
1745 | } | |
1746 | } | |
c71099ac | 1747 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1748 | } |
1749 | ||
5578689a DL |
1750 | static void rtmsg_to_fib6_config(struct net *net, |
1751 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1752 | struct fib6_config *cfg) |
1753 | { | |
1754 | memset(cfg, 0, sizeof(*cfg)); | |
1755 | ||
1756 | cfg->fc_table = RT6_TABLE_MAIN; | |
1757 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1758 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1759 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1760 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1761 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1762 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1763 | ||
5578689a | 1764 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1765 | |
86872cb5 TG |
1766 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1767 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1768 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1769 | } | |
1770 | ||
5578689a | 1771 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1772 | { |
86872cb5 | 1773 | struct fib6_config cfg; |
1da177e4 LT |
1774 | struct in6_rtmsg rtmsg; |
1775 | int err; | |
1776 | ||
1777 | switch(cmd) { | |
1778 | case SIOCADDRT: /* Add a route */ | |
1779 | case SIOCDELRT: /* Delete a route */ | |
1780 | if (!capable(CAP_NET_ADMIN)) | |
1781 | return -EPERM; | |
1782 | err = copy_from_user(&rtmsg, arg, | |
1783 | sizeof(struct in6_rtmsg)); | |
1784 | if (err) | |
1785 | return -EFAULT; | |
86872cb5 | 1786 | |
5578689a | 1787 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1788 | |
1da177e4 LT |
1789 | rtnl_lock(); |
1790 | switch (cmd) { | |
1791 | case SIOCADDRT: | |
86872cb5 | 1792 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1793 | break; |
1794 | case SIOCDELRT: | |
86872cb5 | 1795 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1796 | break; |
1797 | default: | |
1798 | err = -EINVAL; | |
1799 | } | |
1800 | rtnl_unlock(); | |
1801 | ||
1802 | return err; | |
3ff50b79 | 1803 | } |
1da177e4 LT |
1804 | |
1805 | return -EINVAL; | |
1806 | } | |
1807 | ||
1808 | /* | |
1809 | * Drop the packet on the floor | |
1810 | */ | |
1811 | ||
50eb431d | 1812 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1813 | { |
612f09e8 YH |
1814 | int type; |
1815 | switch (ipstats_mib_noroutes) { | |
1816 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1817 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1818 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1819 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1820 | break; | |
1821 | } | |
1822 | /* FALLTHROUGH */ | |
1823 | case IPSTATS_MIB_OUTNOROUTES: | |
1824 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1825 | break; | |
1826 | } | |
9ce8ade0 | 1827 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1828 | kfree_skb(skb); |
1829 | return 0; | |
1830 | } | |
1831 | ||
9ce8ade0 TG |
1832 | static int ip6_pkt_discard(struct sk_buff *skb) |
1833 | { | |
612f09e8 | 1834 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1835 | } |
1836 | ||
20380731 | 1837 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1838 | { |
1839 | skb->dev = skb->dst->dev; | |
612f09e8 | 1840 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1841 | } |
1842 | ||
6723ab54 DM |
1843 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1844 | ||
9ce8ade0 TG |
1845 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1846 | { | |
612f09e8 | 1847 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1848 | } |
1849 | ||
1850 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1851 | { | |
1852 | skb->dev = skb->dst->dev; | |
612f09e8 | 1853 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1854 | } |
1855 | ||
6723ab54 DM |
1856 | #endif |
1857 | ||
1da177e4 LT |
1858 | /* |
1859 | * Allocate a dst for local (unicast / anycast) address. | |
1860 | */ | |
1861 | ||
1862 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1863 | const struct in6_addr *addr, | |
1864 | int anycast) | |
1865 | { | |
c346dca1 | 1866 | struct net *net = dev_net(idev->dev); |
f2fc6a54 | 1867 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1868 | |
1869 | if (rt == NULL) | |
1870 | return ERR_PTR(-ENOMEM); | |
1871 | ||
5578689a | 1872 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1873 | in6_dev_hold(idev); |
1874 | ||
1875 | rt->u.dst.flags = DST_HOST; | |
1876 | rt->u.dst.input = ip6_input; | |
1877 | rt->u.dst.output = ip6_output; | |
5578689a | 1878 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1879 | rt->rt6i_idev = idev; |
1880 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1881 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1882 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1883 | rt->u.dst.obsolete = -1; | |
1884 | ||
1885 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1886 | if (anycast) |
1887 | rt->rt6i_flags |= RTF_ANYCAST; | |
1888 | else | |
1da177e4 LT |
1889 | rt->rt6i_flags |= RTF_LOCAL; |
1890 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1891 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1892 | dst_free(&rt->u.dst); |
1da177e4 LT |
1893 | return ERR_PTR(-ENOMEM); |
1894 | } | |
1895 | ||
1896 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1897 | rt->rt6i_dst.plen = 128; | |
5578689a | 1898 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1899 | |
1900 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1901 | ||
1902 | return rt; | |
1903 | } | |
1904 | ||
8ed67789 DL |
1905 | struct arg_dev_net { |
1906 | struct net_device *dev; | |
1907 | struct net *net; | |
1908 | }; | |
1909 | ||
1da177e4 LT |
1910 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1911 | { | |
8ed67789 DL |
1912 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1913 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1914 | ||
1915 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1916 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1917 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1918 | return -1; | |
1919 | } | |
1920 | return 0; | |
1921 | } | |
1922 | ||
f3db4851 | 1923 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1924 | { |
8ed67789 DL |
1925 | struct arg_dev_net adn = { |
1926 | .dev = dev, | |
1927 | .net = net, | |
1928 | }; | |
1929 | ||
1930 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1da177e4 LT |
1931 | } |
1932 | ||
1933 | struct rt6_mtu_change_arg | |
1934 | { | |
1935 | struct net_device *dev; | |
1936 | unsigned mtu; | |
1937 | }; | |
1938 | ||
1939 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1940 | { | |
1941 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1942 | struct inet6_dev *idev; | |
c346dca1 | 1943 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
1944 | |
1945 | /* In IPv6 pmtu discovery is not optional, | |
1946 | so that RTAX_MTU lock cannot disable it. | |
1947 | We still use this lock to block changes | |
1948 | caused by addrconf/ndisc. | |
1949 | */ | |
1950 | ||
1951 | idev = __in6_dev_get(arg->dev); | |
1952 | if (idev == NULL) | |
1953 | return 0; | |
1954 | ||
1955 | /* For administrative MTU increase, there is no way to discover | |
1956 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1957 | Since RFC 1981 doesn't include administrative MTU increase | |
1958 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1959 | */ | |
1960 | /* | |
1961 | If new MTU is less than route PMTU, this new MTU will be the | |
1962 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1963 | decreases; if new MTU is greater than route PMTU, and the | |
1964 | old MTU is the lowest MTU in the path, update the route PMTU | |
1965 | to reflect the increase. In this case if the other nodes' MTU | |
1966 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1967 | PMTU discouvery. | |
1968 | */ | |
1969 | if (rt->rt6i_dev == arg->dev && | |
1970 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1971 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1972 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1973 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1974 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 1975 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 1976 | } |
1da177e4 LT |
1977 | return 0; |
1978 | } | |
1979 | ||
1980 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1981 | { | |
c71099ac TG |
1982 | struct rt6_mtu_change_arg arg = { |
1983 | .dev = dev, | |
1984 | .mtu = mtu, | |
1985 | }; | |
1da177e4 | 1986 | |
c346dca1 | 1987 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1988 | } |
1989 | ||
ef7c79ed | 1990 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1991 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1992 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1993 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1994 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1995 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1996 | }; | |
1997 | ||
1998 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1999 | struct fib6_config *cfg) | |
1da177e4 | 2000 | { |
86872cb5 TG |
2001 | struct rtmsg *rtm; |
2002 | struct nlattr *tb[RTA_MAX+1]; | |
2003 | int err; | |
1da177e4 | 2004 | |
86872cb5 TG |
2005 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2006 | if (err < 0) | |
2007 | goto errout; | |
1da177e4 | 2008 | |
86872cb5 TG |
2009 | err = -EINVAL; |
2010 | rtm = nlmsg_data(nlh); | |
2011 | memset(cfg, 0, sizeof(*cfg)); | |
2012 | ||
2013 | cfg->fc_table = rtm->rtm_table; | |
2014 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2015 | cfg->fc_src_len = rtm->rtm_src_len; | |
2016 | cfg->fc_flags = RTF_UP; | |
2017 | cfg->fc_protocol = rtm->rtm_protocol; | |
2018 | ||
2019 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2020 | cfg->fc_flags |= RTF_REJECT; | |
2021 | ||
2022 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2023 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2024 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2025 | |
2026 | if (tb[RTA_GATEWAY]) { | |
2027 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2028 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2029 | } |
86872cb5 TG |
2030 | |
2031 | if (tb[RTA_DST]) { | |
2032 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2033 | ||
2034 | if (nla_len(tb[RTA_DST]) < plen) | |
2035 | goto errout; | |
2036 | ||
2037 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2038 | } |
86872cb5 TG |
2039 | |
2040 | if (tb[RTA_SRC]) { | |
2041 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2042 | ||
2043 | if (nla_len(tb[RTA_SRC]) < plen) | |
2044 | goto errout; | |
2045 | ||
2046 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2047 | } |
86872cb5 TG |
2048 | |
2049 | if (tb[RTA_OIF]) | |
2050 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2051 | ||
2052 | if (tb[RTA_PRIORITY]) | |
2053 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2054 | ||
2055 | if (tb[RTA_METRICS]) { | |
2056 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2057 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2058 | } |
86872cb5 TG |
2059 | |
2060 | if (tb[RTA_TABLE]) | |
2061 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2062 | ||
2063 | err = 0; | |
2064 | errout: | |
2065 | return err; | |
1da177e4 LT |
2066 | } |
2067 | ||
c127ea2c | 2068 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2069 | { |
86872cb5 TG |
2070 | struct fib6_config cfg; |
2071 | int err; | |
1da177e4 | 2072 | |
86872cb5 TG |
2073 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2074 | if (err < 0) | |
2075 | return err; | |
2076 | ||
2077 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2078 | } |
2079 | ||
c127ea2c | 2080 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2081 | { |
86872cb5 TG |
2082 | struct fib6_config cfg; |
2083 | int err; | |
1da177e4 | 2084 | |
86872cb5 TG |
2085 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2086 | if (err < 0) | |
2087 | return err; | |
2088 | ||
2089 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2090 | } |
2091 | ||
339bf98f TG |
2092 | static inline size_t rt6_nlmsg_size(void) |
2093 | { | |
2094 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2095 | + nla_total_size(16) /* RTA_SRC */ | |
2096 | + nla_total_size(16) /* RTA_DST */ | |
2097 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2098 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2099 | + nla_total_size(4) /* RTA_TABLE */ | |
2100 | + nla_total_size(4) /* RTA_IIF */ | |
2101 | + nla_total_size(4) /* RTA_OIF */ | |
2102 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2103 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2104 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2105 | } | |
2106 | ||
1da177e4 | 2107 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2108 | struct in6_addr *dst, struct in6_addr *src, |
2109 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2110 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2111 | { |
2112 | struct rtmsg *rtm; | |
2d7202bf | 2113 | struct nlmsghdr *nlh; |
e3703b3d | 2114 | long expires; |
9e762a4a | 2115 | u32 table; |
1da177e4 LT |
2116 | |
2117 | if (prefix) { /* user wants prefix routes only */ | |
2118 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2119 | /* success since this is not a prefix route */ | |
2120 | return 1; | |
2121 | } | |
2122 | } | |
2123 | ||
2d7202bf TG |
2124 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2125 | if (nlh == NULL) | |
26932566 | 2126 | return -EMSGSIZE; |
2d7202bf TG |
2127 | |
2128 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2129 | rtm->rtm_family = AF_INET6; |
2130 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2131 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2132 | rtm->rtm_tos = 0; | |
c71099ac | 2133 | if (rt->rt6i_table) |
9e762a4a | 2134 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2135 | else |
9e762a4a PM |
2136 | table = RT6_TABLE_UNSPEC; |
2137 | rtm->rtm_table = table; | |
2d7202bf | 2138 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2139 | if (rt->rt6i_flags&RTF_REJECT) |
2140 | rtm->rtm_type = RTN_UNREACHABLE; | |
2141 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2142 | rtm->rtm_type = RTN_LOCAL; | |
2143 | else | |
2144 | rtm->rtm_type = RTN_UNICAST; | |
2145 | rtm->rtm_flags = 0; | |
2146 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2147 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2148 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2149 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2150 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2151 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2152 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2153 | rtm->rtm_protocol = RTPROT_RA; | |
2154 | ||
2155 | if (rt->rt6i_flags&RTF_CACHE) | |
2156 | rtm->rtm_flags |= RTM_F_CLONED; | |
2157 | ||
2158 | if (dst) { | |
2d7202bf | 2159 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2160 | rtm->rtm_dst_len = 128; |
1da177e4 | 2161 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2162 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2163 | #ifdef CONFIG_IPV6_SUBTREES |
2164 | if (src) { | |
2d7202bf | 2165 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2166 | rtm->rtm_src_len = 128; |
1da177e4 | 2167 | } else if (rtm->rtm_src_len) |
2d7202bf | 2168 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2169 | #endif |
7bc570c8 YH |
2170 | if (iif) { |
2171 | #ifdef CONFIG_IPV6_MROUTE | |
2172 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
2173 | int err = ip6mr_get_route(skb, rtm, nowait); | |
2174 | if (err <= 0) { | |
2175 | if (!nowait) { | |
2176 | if (err == 0) | |
2177 | return 0; | |
2178 | goto nla_put_failure; | |
2179 | } else { | |
2180 | if (err == -EMSGSIZE) | |
2181 | goto nla_put_failure; | |
2182 | } | |
2183 | } | |
2184 | } else | |
2185 | #endif | |
2186 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2187 | } else if (dst) { | |
1da177e4 | 2188 | struct in6_addr saddr_buf; |
5e5f3f0f | 2189 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
7cbca67c | 2190 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2191 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2192 | } |
2d7202bf | 2193 | |
1da177e4 | 2194 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2195 | goto nla_put_failure; |
2196 | ||
1da177e4 | 2197 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2198 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2199 | ||
1da177e4 | 2200 | if (rt->u.dst.dev) |
2d7202bf TG |
2201 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2202 | ||
2203 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2204 | |
69cdf8f9 YH |
2205 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? |
2206 | rt->rt6i_expires - jiffies : 0; | |
2207 | ||
e3703b3d TG |
2208 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, |
2209 | expires, rt->u.dst.error) < 0) | |
2210 | goto nla_put_failure; | |
2d7202bf TG |
2211 | |
2212 | return nlmsg_end(skb, nlh); | |
2213 | ||
2214 | nla_put_failure: | |
26932566 PM |
2215 | nlmsg_cancel(skb, nlh); |
2216 | return -EMSGSIZE; | |
1da177e4 LT |
2217 | } |
2218 | ||
1b43af54 | 2219 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2220 | { |
2221 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2222 | int prefix; | |
2223 | ||
2d7202bf TG |
2224 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2225 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2226 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2227 | } else | |
2228 | prefix = 0; | |
2229 | ||
2230 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2231 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
7bc570c8 | 2232 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2233 | } |
2234 | ||
c127ea2c | 2235 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2236 | { |
3b1e0a65 | 2237 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2238 | struct nlattr *tb[RTA_MAX+1]; |
2239 | struct rt6_info *rt; | |
1da177e4 | 2240 | struct sk_buff *skb; |
ab364a6f | 2241 | struct rtmsg *rtm; |
1da177e4 | 2242 | struct flowi fl; |
ab364a6f | 2243 | int err, iif = 0; |
1da177e4 | 2244 | |
ab364a6f TG |
2245 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2246 | if (err < 0) | |
2247 | goto errout; | |
1da177e4 | 2248 | |
ab364a6f | 2249 | err = -EINVAL; |
1da177e4 | 2250 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2251 | |
ab364a6f TG |
2252 | if (tb[RTA_SRC]) { |
2253 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2254 | goto errout; | |
2255 | ||
2256 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2257 | } | |
2258 | ||
2259 | if (tb[RTA_DST]) { | |
2260 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2261 | goto errout; | |
2262 | ||
2263 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2264 | } | |
2265 | ||
2266 | if (tb[RTA_IIF]) | |
2267 | iif = nla_get_u32(tb[RTA_IIF]); | |
2268 | ||
2269 | if (tb[RTA_OIF]) | |
2270 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2271 | |
2272 | if (iif) { | |
2273 | struct net_device *dev; | |
5578689a | 2274 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2275 | if (!dev) { |
2276 | err = -ENODEV; | |
ab364a6f | 2277 | goto errout; |
1da177e4 LT |
2278 | } |
2279 | } | |
2280 | ||
ab364a6f TG |
2281 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2282 | if (skb == NULL) { | |
2283 | err = -ENOBUFS; | |
2284 | goto errout; | |
2285 | } | |
1da177e4 | 2286 | |
ab364a6f TG |
2287 | /* Reserve room for dummy headers, this skb can pass |
2288 | through good chunk of routing engine. | |
2289 | */ | |
459a98ed | 2290 | skb_reset_mac_header(skb); |
ab364a6f | 2291 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2292 | |
8a3edd80 | 2293 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
2294 | skb->dst = &rt->u.dst; |
2295 | ||
ab364a6f | 2296 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2297 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2298 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2299 | if (err < 0) { |
ab364a6f TG |
2300 | kfree_skb(skb); |
2301 | goto errout; | |
1da177e4 LT |
2302 | } |
2303 | ||
5578689a | 2304 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2305 | errout: |
1da177e4 | 2306 | return err; |
1da177e4 LT |
2307 | } |
2308 | ||
86872cb5 | 2309 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2310 | { |
2311 | struct sk_buff *skb; | |
5578689a | 2312 | struct net *net = info->nl_net; |
528c4ceb DL |
2313 | u32 seq; |
2314 | int err; | |
2315 | ||
2316 | err = -ENOBUFS; | |
2317 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2318 | |
339bf98f | 2319 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2320 | if (skb == NULL) |
2321 | goto errout; | |
2322 | ||
528c4ceb | 2323 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
7bc570c8 | 2324 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2325 | if (err < 0) { |
2326 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2327 | WARN_ON(err == -EMSGSIZE); | |
2328 | kfree_skb(skb); | |
2329 | goto errout; | |
2330 | } | |
5578689a DL |
2331 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2332 | info->nlh, gfp_any()); | |
21713ebc TG |
2333 | errout: |
2334 | if (err < 0) | |
5578689a | 2335 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2336 | } |
2337 | ||
8ed67789 DL |
2338 | static int ip6_route_dev_notify(struct notifier_block *this, |
2339 | unsigned long event, void *data) | |
2340 | { | |
2341 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2342 | struct net *net = dev_net(dev); |
8ed67789 DL |
2343 | |
2344 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2345 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2346 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2347 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2348 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2349 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2350 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2351 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2352 | #endif | |
2353 | } | |
2354 | ||
2355 | return NOTIFY_OK; | |
2356 | } | |
2357 | ||
1da177e4 LT |
2358 | /* |
2359 | * /proc | |
2360 | */ | |
2361 | ||
2362 | #ifdef CONFIG_PROC_FS | |
2363 | ||
2364 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2365 | ||
2366 | struct rt6_proc_arg | |
2367 | { | |
2368 | char *buffer; | |
2369 | int offset; | |
2370 | int length; | |
2371 | int skip; | |
2372 | int len; | |
2373 | }; | |
2374 | ||
2375 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2376 | { | |
33120b30 | 2377 | struct seq_file *m = p_arg; |
1da177e4 | 2378 | |
33120b30 AD |
2379 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2380 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2381 | |
2382 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2383 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2384 | rt->rt6i_src.plen); | |
1da177e4 | 2385 | #else |
33120b30 | 2386 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2387 | #endif |
2388 | ||
2389 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2390 | seq_printf(m, NIP6_SEQFMT, |
2391 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2392 | } else { |
33120b30 | 2393 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2394 | } |
33120b30 AD |
2395 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2396 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2397 | rt->u.dst.__use, rt->rt6i_flags, | |
2398 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2399 | return 0; |
2400 | } | |
2401 | ||
33120b30 | 2402 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2403 | { |
f3db4851 DL |
2404 | struct net *net = (struct net *)m->private; |
2405 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2406 | return 0; |
2407 | } | |
1da177e4 | 2408 | |
33120b30 AD |
2409 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2410 | { | |
a2333525 | 2411 | int err; |
f3db4851 DL |
2412 | struct net *net = get_proc_net(inode); |
2413 | if (!net) | |
2414 | return -ENXIO; | |
a2333525 PE |
2415 | |
2416 | err = single_open(file, ipv6_route_show, net); | |
2417 | if (err < 0) { | |
2418 | put_net(net); | |
2419 | return err; | |
2420 | } | |
2421 | ||
2422 | return 0; | |
f3db4851 DL |
2423 | } |
2424 | ||
2425 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2426 | { | |
2427 | struct seq_file *seq = file->private_data; | |
2428 | struct net *net = seq->private; | |
2429 | put_net(net); | |
2430 | return single_release(inode, file); | |
1da177e4 LT |
2431 | } |
2432 | ||
33120b30 AD |
2433 | static const struct file_operations ipv6_route_proc_fops = { |
2434 | .owner = THIS_MODULE, | |
2435 | .open = ipv6_route_open, | |
2436 | .read = seq_read, | |
2437 | .llseek = seq_lseek, | |
f3db4851 | 2438 | .release = ipv6_route_release, |
33120b30 AD |
2439 | }; |
2440 | ||
1da177e4 LT |
2441 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2442 | { | |
69ddb805 | 2443 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2444 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2445 | net->ipv6.rt6_stats->fib_nodes, |
2446 | net->ipv6.rt6_stats->fib_route_nodes, | |
2447 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2448 | net->ipv6.rt6_stats->fib_rt_entries, | |
2449 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2450 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2451 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2452 | |
2453 | return 0; | |
2454 | } | |
2455 | ||
2456 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2457 | { | |
a2333525 | 2458 | int err; |
69ddb805 | 2459 | struct net *net = get_proc_net(inode); |
a2333525 PE |
2460 | if (!net) |
2461 | return -ENXIO; | |
2462 | ||
2463 | err = single_open(file, rt6_stats_seq_show, net); | |
2464 | if (err < 0) { | |
2465 | put_net(net); | |
2466 | return err; | |
2467 | } | |
2468 | ||
2469 | return 0; | |
69ddb805 DL |
2470 | } |
2471 | ||
2472 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2473 | { | |
2474 | struct seq_file *seq = file->private_data; | |
2475 | struct net *net = (struct net *)seq->private; | |
2476 | put_net(net); | |
2477 | return single_release(inode, file); | |
1da177e4 LT |
2478 | } |
2479 | ||
9a32144e | 2480 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2481 | .owner = THIS_MODULE, |
2482 | .open = rt6_stats_seq_open, | |
2483 | .read = seq_read, | |
2484 | .llseek = seq_lseek, | |
69ddb805 | 2485 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2486 | }; |
2487 | #endif /* CONFIG_PROC_FS */ | |
2488 | ||
2489 | #ifdef CONFIG_SYSCTL | |
2490 | ||
1da177e4 LT |
2491 | static |
2492 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2493 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2494 | { | |
5b7c931d DL |
2495 | struct net *net = current->nsproxy->net_ns; |
2496 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2497 | if (write) { |
2498 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2499 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2500 | return 0; |
2501 | } else | |
2502 | return -EINVAL; | |
2503 | } | |
2504 | ||
760f2d01 | 2505 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2506 | { |
1da177e4 | 2507 | .procname = "flush", |
4990509f | 2508 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2509 | .maxlen = sizeof(int), |
89c8b3a1 | 2510 | .mode = 0200, |
1ab1457c | 2511 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2512 | }, |
2513 | { | |
2514 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2515 | .procname = "gc_thresh", | |
9a7ec3a9 | 2516 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2517 | .maxlen = sizeof(int), |
2518 | .mode = 0644, | |
1ab1457c | 2519 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2520 | }, |
2521 | { | |
2522 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2523 | .procname = "max_size", | |
4990509f | 2524 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2525 | .maxlen = sizeof(int), |
2526 | .mode = 0644, | |
1ab1457c | 2527 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2528 | }, |
2529 | { | |
2530 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2531 | .procname = "gc_min_interval", | |
4990509f | 2532 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2533 | .maxlen = sizeof(int), |
2534 | .mode = 0644, | |
1ab1457c | 2535 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2536 | .strategy = &sysctl_jiffies, |
2537 | }, | |
2538 | { | |
2539 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2540 | .procname = "gc_timeout", | |
4990509f | 2541 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2542 | .maxlen = sizeof(int), |
2543 | .mode = 0644, | |
1ab1457c | 2544 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2545 | .strategy = &sysctl_jiffies, |
2546 | }, | |
2547 | { | |
2548 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2549 | .procname = "gc_interval", | |
4990509f | 2550 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2551 | .maxlen = sizeof(int), |
2552 | .mode = 0644, | |
1ab1457c | 2553 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2554 | .strategy = &sysctl_jiffies, |
2555 | }, | |
2556 | { | |
2557 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2558 | .procname = "gc_elasticity", | |
4990509f | 2559 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2560 | .maxlen = sizeof(int), |
2561 | .mode = 0644, | |
1ab1457c | 2562 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2563 | .strategy = &sysctl_jiffies, |
2564 | }, | |
2565 | { | |
2566 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2567 | .procname = "mtu_expires", | |
4990509f | 2568 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2569 | .maxlen = sizeof(int), |
2570 | .mode = 0644, | |
1ab1457c | 2571 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2572 | .strategy = &sysctl_jiffies, |
2573 | }, | |
2574 | { | |
2575 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2576 | .procname = "min_adv_mss", | |
4990509f | 2577 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2578 | .maxlen = sizeof(int), |
2579 | .mode = 0644, | |
1ab1457c | 2580 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2581 | .strategy = &sysctl_jiffies, |
2582 | }, | |
2583 | { | |
2584 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2585 | .procname = "gc_min_interval_ms", | |
4990509f | 2586 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2587 | .maxlen = sizeof(int), |
2588 | .mode = 0644, | |
1ab1457c | 2589 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2590 | .strategy = &sysctl_ms_jiffies, |
2591 | }, | |
2592 | { .ctl_name = 0 } | |
2593 | }; | |
2594 | ||
760f2d01 DL |
2595 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2596 | { | |
2597 | struct ctl_table *table; | |
2598 | ||
2599 | table = kmemdup(ipv6_route_table_template, | |
2600 | sizeof(ipv6_route_table_template), | |
2601 | GFP_KERNEL); | |
5ee09105 YH |
2602 | |
2603 | if (table) { | |
2604 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2605 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2606 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2607 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2608 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2609 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2610 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2611 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2612 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2613 | } | |
2614 | ||
760f2d01 DL |
2615 | return table; |
2616 | } | |
1da177e4 LT |
2617 | #endif |
2618 | ||
cdb18761 DL |
2619 | static int ip6_route_net_init(struct net *net) |
2620 | { | |
633d424b | 2621 | int ret = -ENOMEM; |
8ed67789 | 2622 | |
f2fc6a54 BT |
2623 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2624 | sizeof(*net->ipv6.ip6_dst_ops), | |
2625 | GFP_KERNEL); | |
2626 | if (!net->ipv6.ip6_dst_ops) | |
2627 | goto out; | |
48115bec | 2628 | net->ipv6.ip6_dst_ops->dst_net = hold_net(net); |
f2fc6a54 | 2629 | |
8ed67789 DL |
2630 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2631 | sizeof(*net->ipv6.ip6_null_entry), | |
2632 | GFP_KERNEL); | |
2633 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2634 | goto out_ip6_dst_ops; |
8ed67789 DL |
2635 | net->ipv6.ip6_null_entry->u.dst.path = |
2636 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2637 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2638 | |
2639 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2640 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2641 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2642 | GFP_KERNEL); | |
2643 | if (!net->ipv6.ip6_prohibit_entry) { | |
2644 | kfree(net->ipv6.ip6_null_entry); | |
2645 | goto out; | |
2646 | } | |
2647 | net->ipv6.ip6_prohibit_entry->u.dst.path = | |
2648 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2649 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2650 | |
2651 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2652 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2653 | GFP_KERNEL); | |
2654 | if (!net->ipv6.ip6_blk_hole_entry) { | |
2655 | kfree(net->ipv6.ip6_null_entry); | |
2656 | kfree(net->ipv6.ip6_prohibit_entry); | |
2657 | goto out; | |
2658 | } | |
2659 | net->ipv6.ip6_blk_hole_entry->u.dst.path = | |
2660 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2661 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2662 | #endif |
2663 | ||
cdb18761 DL |
2664 | #ifdef CONFIG_PROC_FS |
2665 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2666 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2667 | #endif | |
6891a346 BT |
2668 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2669 | ||
8ed67789 DL |
2670 | ret = 0; |
2671 | out: | |
2672 | return ret; | |
f2fc6a54 BT |
2673 | |
2674 | out_ip6_dst_ops: | |
48115bec | 2675 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 BT |
2676 | kfree(net->ipv6.ip6_dst_ops); |
2677 | goto out; | |
cdb18761 DL |
2678 | } |
2679 | ||
2680 | static void ip6_route_net_exit(struct net *net) | |
2681 | { | |
2682 | #ifdef CONFIG_PROC_FS | |
2683 | proc_net_remove(net, "ipv6_route"); | |
2684 | proc_net_remove(net, "rt6_stats"); | |
2685 | #endif | |
8ed67789 DL |
2686 | kfree(net->ipv6.ip6_null_entry); |
2687 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2688 | kfree(net->ipv6.ip6_prohibit_entry); | |
2689 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2690 | #endif | |
48115bec | 2691 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 | 2692 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2693 | } |
2694 | ||
2695 | static struct pernet_operations ip6_route_net_ops = { | |
2696 | .init = ip6_route_net_init, | |
2697 | .exit = ip6_route_net_exit, | |
2698 | }; | |
2699 | ||
8ed67789 DL |
2700 | static struct notifier_block ip6_route_dev_notifier = { |
2701 | .notifier_call = ip6_route_dev_notify, | |
2702 | .priority = 0, | |
2703 | }; | |
2704 | ||
433d49c3 | 2705 | int __init ip6_route_init(void) |
1da177e4 | 2706 | { |
433d49c3 DL |
2707 | int ret; |
2708 | ||
9a7ec3a9 DL |
2709 | ret = -ENOMEM; |
2710 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2711 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2712 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2713 | if (!ip6_dst_ops_template.kmem_cachep) |
f2fc6a54 | 2714 | goto out;; |
14e50e57 | 2715 | |
8ed67789 DL |
2716 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2717 | if (ret) | |
bdb3289f | 2718 | goto out_kmem_cache; |
bdb3289f | 2719 | |
8ed67789 DL |
2720 | /* Registering of the loopback is done before this portion of code, |
2721 | * the loopback reference in rt6_info will not be taken, do it | |
2722 | * manually for init_net */ | |
2723 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2724 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2725 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2726 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2727 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2728 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2729 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2730 | #endif | |
433d49c3 DL |
2731 | ret = fib6_init(); |
2732 | if (ret) | |
8ed67789 | 2733 | goto out_register_subsys; |
433d49c3 | 2734 | |
433d49c3 DL |
2735 | ret = xfrm6_init(); |
2736 | if (ret) | |
cdb18761 | 2737 | goto out_fib6_init; |
c35b7e72 | 2738 | |
433d49c3 DL |
2739 | ret = fib6_rules_init(); |
2740 | if (ret) | |
2741 | goto xfrm6_init; | |
7e5449c2 | 2742 | |
433d49c3 DL |
2743 | ret = -ENOBUFS; |
2744 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2745 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2746 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2747 | goto fib6_rules_init; | |
c127ea2c | 2748 | |
8ed67789 | 2749 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2750 | if (ret) |
2751 | goto fib6_rules_init; | |
8ed67789 | 2752 | |
433d49c3 DL |
2753 | out: |
2754 | return ret; | |
2755 | ||
2756 | fib6_rules_init: | |
433d49c3 DL |
2757 | fib6_rules_cleanup(); |
2758 | xfrm6_init: | |
433d49c3 | 2759 | xfrm6_fini(); |
433d49c3 | 2760 | out_fib6_init: |
433d49c3 | 2761 | fib6_gc_cleanup(); |
8ed67789 DL |
2762 | out_register_subsys: |
2763 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2764 | out_kmem_cache: |
f2fc6a54 | 2765 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2766 | goto out; |
1da177e4 LT |
2767 | } |
2768 | ||
2769 | void ip6_route_cleanup(void) | |
2770 | { | |
8ed67789 | 2771 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2772 | fib6_rules_cleanup(); |
1da177e4 | 2773 | xfrm6_fini(); |
1da177e4 | 2774 | fib6_gc_cleanup(); |
8ed67789 | 2775 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2776 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2777 | } |