Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
7bc570c8 | 37 | #include <linux/mroute6.h> |
1da177e4 | 38 | #include <linux/init.h> |
1da177e4 | 39 | #include <linux/if_arp.h> |
1da177e4 LT |
40 | #include <linux/proc_fs.h> |
41 | #include <linux/seq_file.h> | |
5b7c931d | 42 | #include <linux/nsproxy.h> |
457c4cbc | 43 | #include <net/net_namespace.h> |
1da177e4 LT |
44 | #include <net/snmp.h> |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_fib.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/tcp.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/xfrm.h> | |
8d71740c | 54 | #include <net/netevent.h> |
21713ebc | 55 | #include <net/netlink.h> |
1da177e4 LT |
56 | |
57 | #include <asm/uaccess.h> | |
58 | ||
59 | #ifdef CONFIG_SYSCTL | |
60 | #include <linux/sysctl.h> | |
61 | #endif | |
62 | ||
63 | /* Set to 3 to get tracing. */ | |
64 | #define RT6_DEBUG 2 | |
65 | ||
66 | #if RT6_DEBUG >= 3 | |
67 | #define RDBG(x) printk x | |
68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
69 | #else | |
70 | #define RDBG(x) | |
71 | #define RT6_TRACE(x...) do { ; } while (0) | |
72 | #endif | |
73 | ||
519fbd87 | 74 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 75 | |
1da177e4 LT |
76 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
78 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
79 | static void ip6_dst_destroy(struct dst_entry *); | |
80 | static void ip6_dst_ifdown(struct dst_entry *, | |
81 | struct net_device *dev, int how); | |
569d3645 | 82 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
83 | |
84 | static int ip6_pkt_discard(struct sk_buff *skb); | |
85 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
86 | static void ip6_link_failure(struct sk_buff *skb); | |
87 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
88 | ||
70ceb4f5 | 89 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
90 | static struct rt6_info *rt6_add_route_info(struct net *net, |
91 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
92 | struct in6_addr *gwaddr, int ifindex, |
93 | unsigned pref); | |
efa2cea0 DL |
94 | static struct rt6_info *rt6_get_route_info(struct net *net, |
95 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
96 | struct in6_addr *gwaddr, int ifindex); |
97 | #endif | |
98 | ||
9a7ec3a9 | 99 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 LT |
100 | .family = AF_INET6, |
101 | .protocol = __constant_htons(ETH_P_IPV6), | |
102 | .gc = ip6_dst_gc, | |
103 | .gc_thresh = 1024, | |
104 | .check = ip6_dst_check, | |
105 | .destroy = ip6_dst_destroy, | |
106 | .ifdown = ip6_dst_ifdown, | |
107 | .negative_advice = ip6_negative_advice, | |
108 | .link_failure = ip6_link_failure, | |
109 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 110 | .local_out = __ip6_local_out, |
1da177e4 | 111 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 112 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
113 | }; |
114 | ||
14e50e57 DM |
115 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
116 | { | |
117 | } | |
118 | ||
119 | static struct dst_ops ip6_dst_blackhole_ops = { | |
120 | .family = AF_INET6, | |
121 | .protocol = __constant_htons(ETH_P_IPV6), | |
122 | .destroy = ip6_dst_destroy, | |
123 | .check = ip6_dst_check, | |
124 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
125 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 126 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
127 | }; |
128 | ||
bdb3289f | 129 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
130 | .u = { |
131 | .dst = { | |
132 | .__refcnt = ATOMIC_INIT(1), | |
133 | .__use = 1, | |
1da177e4 LT |
134 | .obsolete = -1, |
135 | .error = -ENETUNREACH, | |
136 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
137 | .input = ip6_pkt_discard, | |
138 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
139 | } |
140 | }, | |
141 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
142 | .rt6i_metric = ~(u32) 0, | |
143 | .rt6i_ref = ATOMIC_INIT(1), | |
144 | }; | |
145 | ||
101367c2 TG |
146 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
147 | ||
6723ab54 DM |
148 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
149 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 150 | |
280a34c8 | 151 | static struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
152 | .u = { |
153 | .dst = { | |
154 | .__refcnt = ATOMIC_INIT(1), | |
155 | .__use = 1, | |
101367c2 TG |
156 | .obsolete = -1, |
157 | .error = -EACCES, | |
158 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
159 | .input = ip6_pkt_prohibit, |
160 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
161 | } |
162 | }, | |
163 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
164 | .rt6i_metric = ~(u32) 0, | |
165 | .rt6i_ref = ATOMIC_INIT(1), | |
166 | }; | |
167 | ||
bdb3289f | 168 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
169 | .u = { |
170 | .dst = { | |
171 | .__refcnt = ATOMIC_INIT(1), | |
172 | .__use = 1, | |
101367c2 TG |
173 | .obsolete = -1, |
174 | .error = -EINVAL, | |
175 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
176 | .input = dst_discard, |
177 | .output = dst_discard, | |
101367c2 TG |
178 | } |
179 | }, | |
180 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
181 | .rt6i_metric = ~(u32) 0, | |
182 | .rt6i_ref = ATOMIC_INIT(1), | |
183 | }; | |
184 | ||
185 | #endif | |
186 | ||
1da177e4 | 187 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 188 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 189 | { |
f2fc6a54 | 190 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
191 | } |
192 | ||
193 | static void ip6_dst_destroy(struct dst_entry *dst) | |
194 | { | |
195 | struct rt6_info *rt = (struct rt6_info *)dst; | |
196 | struct inet6_dev *idev = rt->rt6i_idev; | |
197 | ||
198 | if (idev != NULL) { | |
199 | rt->rt6i_idev = NULL; | |
200 | in6_dev_put(idev); | |
1ab1457c | 201 | } |
1da177e4 LT |
202 | } |
203 | ||
204 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
205 | int how) | |
206 | { | |
207 | struct rt6_info *rt = (struct rt6_info *)dst; | |
208 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 209 | struct net_device *loopback_dev = |
c346dca1 | 210 | dev_net(dev)->loopback_dev; |
1da177e4 | 211 | |
5a3e55d6 DL |
212 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
213 | struct inet6_dev *loopback_idev = | |
214 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
215 | if (loopback_idev != NULL) { |
216 | rt->rt6i_idev = loopback_idev; | |
217 | in6_dev_put(idev); | |
218 | } | |
219 | } | |
220 | } | |
221 | ||
222 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
223 | { | |
224 | return (rt->rt6i_flags & RTF_EXPIRES && | |
225 | time_after(jiffies, rt->rt6i_expires)); | |
226 | } | |
227 | ||
c71099ac TG |
228 | static inline int rt6_need_strict(struct in6_addr *daddr) |
229 | { | |
230 | return (ipv6_addr_type(daddr) & | |
5ce83afa | 231 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)); |
c71099ac TG |
232 | } |
233 | ||
1da177e4 | 234 | /* |
c71099ac | 235 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
236 | */ |
237 | ||
8ed67789 DL |
238 | static inline struct rt6_info *rt6_device_match(struct net *net, |
239 | struct rt6_info *rt, | |
dd3abc4e | 240 | struct in6_addr *saddr, |
1da177e4 | 241 | int oif, |
d420895e | 242 | int flags) |
1da177e4 LT |
243 | { |
244 | struct rt6_info *local = NULL; | |
245 | struct rt6_info *sprt; | |
246 | ||
dd3abc4e YH |
247 | if (!oif && ipv6_addr_any(saddr)) |
248 | goto out; | |
249 | ||
250 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { | |
251 | struct net_device *dev = sprt->rt6i_dev; | |
252 | ||
253 | if (oif) { | |
1da177e4 LT |
254 | if (dev->ifindex == oif) |
255 | return sprt; | |
256 | if (dev->flags & IFF_LOOPBACK) { | |
257 | if (sprt->rt6i_idev == NULL || | |
258 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 259 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 260 | continue; |
1ab1457c | 261 | if (local && (!oif || |
1da177e4 LT |
262 | local->rt6i_idev->dev->ifindex == oif)) |
263 | continue; | |
264 | } | |
265 | local = sprt; | |
266 | } | |
dd3abc4e YH |
267 | } else { |
268 | if (ipv6_chk_addr(net, saddr, dev, | |
269 | flags & RT6_LOOKUP_F_IFACE)) | |
270 | return sprt; | |
1da177e4 | 271 | } |
dd3abc4e | 272 | } |
1da177e4 | 273 | |
dd3abc4e | 274 | if (oif) { |
1da177e4 LT |
275 | if (local) |
276 | return local; | |
277 | ||
d420895e | 278 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 279 | return net->ipv6.ip6_null_entry; |
1da177e4 | 280 | } |
dd3abc4e | 281 | out: |
1da177e4 LT |
282 | return rt; |
283 | } | |
284 | ||
27097255 YH |
285 | #ifdef CONFIG_IPV6_ROUTER_PREF |
286 | static void rt6_probe(struct rt6_info *rt) | |
287 | { | |
288 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
289 | /* | |
290 | * Okay, this does not seem to be appropriate | |
291 | * for now, however, we need to check if it | |
292 | * is really so; aka Router Reachability Probing. | |
293 | * | |
294 | * Router Reachability Probe MUST be rate-limited | |
295 | * to no more than one per minute. | |
296 | */ | |
297 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
298 | return; | |
299 | read_lock_bh(&neigh->lock); | |
300 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 301 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
302 | struct in6_addr mcaddr; |
303 | struct in6_addr *target; | |
304 | ||
305 | neigh->updated = jiffies; | |
306 | read_unlock_bh(&neigh->lock); | |
307 | ||
308 | target = (struct in6_addr *)&neigh->primary_key; | |
309 | addrconf_addr_solict_mult(target, &mcaddr); | |
310 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
311 | } else | |
312 | read_unlock_bh(&neigh->lock); | |
313 | } | |
314 | #else | |
315 | static inline void rt6_probe(struct rt6_info *rt) | |
316 | { | |
317 | return; | |
318 | } | |
319 | #endif | |
320 | ||
1da177e4 | 321 | /* |
554cfb7e | 322 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 323 | */ |
b6f99a21 | 324 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
325 | { |
326 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 327 | if (!oif || dev->ifindex == oif) |
554cfb7e | 328 | return 2; |
161980f4 DM |
329 | if ((dev->flags & IFF_LOOPBACK) && |
330 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
331 | return 1; | |
332 | return 0; | |
554cfb7e | 333 | } |
1da177e4 | 334 | |
b6f99a21 | 335 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 336 | { |
554cfb7e | 337 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 338 | int m; |
4d0c5911 YH |
339 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
340 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
341 | m = 1; | |
342 | else if (neigh) { | |
554cfb7e YH |
343 | read_lock_bh(&neigh->lock); |
344 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 345 | m = 2; |
398bcbeb YH |
346 | #ifdef CONFIG_IPV6_ROUTER_PREF |
347 | else if (neigh->nud_state & NUD_FAILED) | |
348 | m = 0; | |
349 | #endif | |
350 | else | |
ea73ee23 | 351 | m = 1; |
554cfb7e | 352 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
353 | } else |
354 | m = 0; | |
554cfb7e | 355 | return m; |
1da177e4 LT |
356 | } |
357 | ||
554cfb7e YH |
358 | static int rt6_score_route(struct rt6_info *rt, int oif, |
359 | int strict) | |
1da177e4 | 360 | { |
4d0c5911 | 361 | int m, n; |
1ab1457c | 362 | |
4d0c5911 | 363 | m = rt6_check_dev(rt, oif); |
77d16f45 | 364 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 365 | return -1; |
ebacaaa0 YH |
366 | #ifdef CONFIG_IPV6_ROUTER_PREF |
367 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
368 | #endif | |
4d0c5911 | 369 | n = rt6_check_neigh(rt); |
557e92ef | 370 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
371 | return -1; |
372 | return m; | |
373 | } | |
374 | ||
f11e6659 DM |
375 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
376 | int *mpri, struct rt6_info *match) | |
554cfb7e | 377 | { |
f11e6659 DM |
378 | int m; |
379 | ||
380 | if (rt6_check_expired(rt)) | |
381 | goto out; | |
382 | ||
383 | m = rt6_score_route(rt, oif, strict); | |
384 | if (m < 0) | |
385 | goto out; | |
386 | ||
387 | if (m > *mpri) { | |
388 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
389 | rt6_probe(match); | |
390 | *mpri = m; | |
391 | match = rt; | |
392 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
393 | rt6_probe(rt); | |
394 | } | |
395 | ||
396 | out: | |
397 | return match; | |
398 | } | |
399 | ||
400 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
401 | struct rt6_info *rr_head, | |
402 | u32 metric, int oif, int strict) | |
403 | { | |
404 | struct rt6_info *rt, *match; | |
554cfb7e | 405 | int mpri = -1; |
1da177e4 | 406 | |
f11e6659 DM |
407 | match = NULL; |
408 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
409 | rt = rt->u.dst.rt6_next) | |
410 | match = find_match(rt, oif, strict, &mpri, match); | |
411 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
412 | rt = rt->u.dst.rt6_next) | |
413 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 414 | |
f11e6659 DM |
415 | return match; |
416 | } | |
1da177e4 | 417 | |
f11e6659 DM |
418 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
419 | { | |
420 | struct rt6_info *match, *rt0; | |
8ed67789 | 421 | struct net *net; |
1da177e4 | 422 | |
f11e6659 | 423 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 424 | __func__, fn->leaf, oif); |
554cfb7e | 425 | |
f11e6659 DM |
426 | rt0 = fn->rr_ptr; |
427 | if (!rt0) | |
428 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 429 | |
f11e6659 | 430 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 431 | |
554cfb7e | 432 | if (!match && |
f11e6659 DM |
433 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
434 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
435 | ||
554cfb7e | 436 | /* no entries matched; do round-robin */ |
f11e6659 DM |
437 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
438 | next = fn->leaf; | |
439 | ||
440 | if (next != rt0) | |
441 | fn->rr_ptr = next; | |
1da177e4 | 442 | } |
1da177e4 | 443 | |
f11e6659 | 444 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 445 | __func__, match); |
1da177e4 | 446 | |
c346dca1 | 447 | net = dev_net(rt0->rt6i_dev); |
8ed67789 | 448 | return (match ? match : net->ipv6.ip6_null_entry); |
1da177e4 LT |
449 | } |
450 | ||
70ceb4f5 YH |
451 | #ifdef CONFIG_IPV6_ROUTE_INFO |
452 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
453 | struct in6_addr *gwaddr) | |
454 | { | |
c346dca1 | 455 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
456 | struct route_info *rinfo = (struct route_info *) opt; |
457 | struct in6_addr prefix_buf, *prefix; | |
458 | unsigned int pref; | |
4bed72e4 | 459 | unsigned long lifetime; |
70ceb4f5 YH |
460 | struct rt6_info *rt; |
461 | ||
462 | if (len < sizeof(struct route_info)) { | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | /* Sanity check for prefix_len and length */ | |
467 | if (rinfo->length > 3) { | |
468 | return -EINVAL; | |
469 | } else if (rinfo->prefix_len > 128) { | |
470 | return -EINVAL; | |
471 | } else if (rinfo->prefix_len > 64) { | |
472 | if (rinfo->length < 2) { | |
473 | return -EINVAL; | |
474 | } | |
475 | } else if (rinfo->prefix_len > 0) { | |
476 | if (rinfo->length < 1) { | |
477 | return -EINVAL; | |
478 | } | |
479 | } | |
480 | ||
481 | pref = rinfo->route_pref; | |
482 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
483 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
484 | ||
4bed72e4 | 485 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
486 | |
487 | if (rinfo->length == 3) | |
488 | prefix = (struct in6_addr *)rinfo->prefix; | |
489 | else { | |
490 | /* this function is safe */ | |
491 | ipv6_addr_prefix(&prefix_buf, | |
492 | (struct in6_addr *)rinfo->prefix, | |
493 | rinfo->prefix_len); | |
494 | prefix = &prefix_buf; | |
495 | } | |
496 | ||
efa2cea0 DL |
497 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
498 | dev->ifindex); | |
70ceb4f5 YH |
499 | |
500 | if (rt && !lifetime) { | |
e0a1ad73 | 501 | ip6_del_rt(rt); |
70ceb4f5 YH |
502 | rt = NULL; |
503 | } | |
504 | ||
505 | if (!rt && lifetime) | |
efa2cea0 | 506 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
507 | pref); |
508 | else if (rt) | |
509 | rt->rt6i_flags = RTF_ROUTEINFO | | |
510 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
511 | ||
512 | if (rt) { | |
4bed72e4 | 513 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
514 | rt->rt6i_flags &= ~RTF_EXPIRES; |
515 | } else { | |
516 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
517 | rt->rt6i_flags |= RTF_EXPIRES; | |
518 | } | |
519 | dst_release(&rt->u.dst); | |
520 | } | |
521 | return 0; | |
522 | } | |
523 | #endif | |
524 | ||
8ed67789 | 525 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 526 | do { \ |
8ed67789 | 527 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 528 | struct fib6_node *pn; \ |
e0eda7bb | 529 | while (1) { \ |
982f56f3 YH |
530 | if (fn->fn_flags & RTN_TL_ROOT) \ |
531 | goto out; \ | |
532 | pn = fn->parent; \ | |
533 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 534 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
535 | else \ |
536 | fn = pn; \ | |
537 | if (fn->fn_flags & RTN_RTINFO) \ | |
538 | goto restart; \ | |
c71099ac | 539 | } \ |
c71099ac | 540 | } \ |
982f56f3 | 541 | } while(0) |
c71099ac | 542 | |
8ed67789 DL |
543 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
544 | struct fib6_table *table, | |
c71099ac | 545 | struct flowi *fl, int flags) |
1da177e4 LT |
546 | { |
547 | struct fib6_node *fn; | |
548 | struct rt6_info *rt; | |
549 | ||
c71099ac TG |
550 | read_lock_bh(&table->tb6_lock); |
551 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
552 | restart: | |
553 | rt = fn->leaf; | |
dd3abc4e | 554 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 555 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 556 | out: |
03f49f34 | 557 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 558 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
559 | return rt; |
560 | ||
561 | } | |
562 | ||
9acd9f3a YH |
563 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
564 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
565 | { |
566 | struct flowi fl = { | |
567 | .oif = oif, | |
568 | .nl_u = { | |
569 | .ip6_u = { | |
570 | .daddr = *daddr, | |
c71099ac TG |
571 | }, |
572 | }, | |
573 | }; | |
574 | struct dst_entry *dst; | |
77d16f45 | 575 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 576 | |
adaa70bb TG |
577 | if (saddr) { |
578 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
579 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
580 | } | |
581 | ||
606a2b48 | 582 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
583 | if (dst->error == 0) |
584 | return (struct rt6_info *) dst; | |
585 | ||
586 | dst_release(dst); | |
587 | ||
1da177e4 LT |
588 | return NULL; |
589 | } | |
590 | ||
7159039a YH |
591 | EXPORT_SYMBOL(rt6_lookup); |
592 | ||
c71099ac | 593 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
594 | It takes new route entry, the addition fails by any reason the |
595 | route is freed. In any case, if caller does not hold it, it may | |
596 | be destroyed. | |
597 | */ | |
598 | ||
86872cb5 | 599 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
600 | { |
601 | int err; | |
c71099ac | 602 | struct fib6_table *table; |
1da177e4 | 603 | |
c71099ac TG |
604 | table = rt->rt6i_table; |
605 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 606 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 607 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
608 | |
609 | return err; | |
610 | } | |
611 | ||
40e22e8f TG |
612 | int ip6_ins_rt(struct rt6_info *rt) |
613 | { | |
4d1169c1 | 614 | struct nl_info info = { |
c346dca1 | 615 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 616 | }; |
528c4ceb | 617 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
618 | } |
619 | ||
95a9a5ba YH |
620 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
621 | struct in6_addr *saddr) | |
1da177e4 | 622 | { |
1da177e4 LT |
623 | struct rt6_info *rt; |
624 | ||
625 | /* | |
626 | * Clone the route. | |
627 | */ | |
628 | ||
629 | rt = ip6_rt_copy(ort); | |
630 | ||
631 | if (rt) { | |
58c4fb86 YH |
632 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
633 | if (rt->rt6i_dst.plen != 128 && | |
634 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
635 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 636 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 637 | } |
1da177e4 | 638 | |
58c4fb86 | 639 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
640 | rt->rt6i_dst.plen = 128; |
641 | rt->rt6i_flags |= RTF_CACHE; | |
642 | rt->u.dst.flags |= DST_HOST; | |
643 | ||
644 | #ifdef CONFIG_IPV6_SUBTREES | |
645 | if (rt->rt6i_src.plen && saddr) { | |
646 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
647 | rt->rt6i_src.plen = 128; | |
648 | } | |
649 | #endif | |
650 | ||
651 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
652 | ||
95a9a5ba | 653 | } |
1da177e4 | 654 | |
95a9a5ba YH |
655 | return rt; |
656 | } | |
1da177e4 | 657 | |
299d9939 YH |
658 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
659 | { | |
660 | struct rt6_info *rt = ip6_rt_copy(ort); | |
661 | if (rt) { | |
662 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
663 | rt->rt6i_dst.plen = 128; | |
664 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
665 | rt->u.dst.flags |= DST_HOST; |
666 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
667 | } | |
668 | return rt; | |
669 | } | |
670 | ||
8ed67789 DL |
671 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
672 | struct flowi *fl, int flags) | |
1da177e4 LT |
673 | { |
674 | struct fib6_node *fn; | |
519fbd87 | 675 | struct rt6_info *rt, *nrt; |
c71099ac | 676 | int strict = 0; |
1da177e4 | 677 | int attempts = 3; |
519fbd87 | 678 | int err; |
53b7997f | 679 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 680 | |
77d16f45 | 681 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
682 | |
683 | relookup: | |
c71099ac | 684 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 685 | |
8238dd06 | 686 | restart_2: |
c71099ac | 687 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
688 | |
689 | restart: | |
4acad72d | 690 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
691 | |
692 | BACKTRACK(net, &fl->fl6_src); | |
693 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 694 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 695 | goto out; |
1da177e4 | 696 | |
fb9de91e | 697 | dst_hold(&rt->u.dst); |
c71099ac | 698 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 699 | |
519fbd87 | 700 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 701 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
702 | else { |
703 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 704 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
705 | #else |
706 | goto out2; | |
707 | #endif | |
708 | } | |
e40cf353 | 709 | |
519fbd87 | 710 | dst_release(&rt->u.dst); |
8ed67789 | 711 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 712 | |
519fbd87 YH |
713 | dst_hold(&rt->u.dst); |
714 | if (nrt) { | |
40e22e8f | 715 | err = ip6_ins_rt(nrt); |
519fbd87 | 716 | if (!err) |
1da177e4 | 717 | goto out2; |
1da177e4 | 718 | } |
1da177e4 | 719 | |
519fbd87 YH |
720 | if (--attempts <= 0) |
721 | goto out2; | |
722 | ||
723 | /* | |
c71099ac | 724 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
725 | * released someone could insert this route. Relookup. |
726 | */ | |
727 | dst_release(&rt->u.dst); | |
728 | goto relookup; | |
729 | ||
730 | out: | |
8238dd06 YH |
731 | if (reachable) { |
732 | reachable = 0; | |
733 | goto restart_2; | |
734 | } | |
519fbd87 | 735 | dst_hold(&rt->u.dst); |
c71099ac | 736 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
737 | out2: |
738 | rt->u.dst.lastuse = jiffies; | |
739 | rt->u.dst.__use++; | |
c71099ac TG |
740 | |
741 | return rt; | |
1da177e4 LT |
742 | } |
743 | ||
8ed67789 | 744 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
745 | struct flowi *fl, int flags) |
746 | { | |
8ed67789 | 747 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
748 | } |
749 | ||
c71099ac TG |
750 | void ip6_route_input(struct sk_buff *skb) |
751 | { | |
0660e03f | 752 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 753 | struct net *net = dev_net(skb->dev); |
adaa70bb | 754 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
755 | struct flowi fl = { |
756 | .iif = skb->dev->ifindex, | |
757 | .nl_u = { | |
758 | .ip6_u = { | |
759 | .daddr = iph->daddr, | |
760 | .saddr = iph->saddr, | |
90bcaf7b | 761 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
762 | }, |
763 | }, | |
1ab1457c | 764 | .mark = skb->mark, |
c71099ac TG |
765 | .proto = iph->nexthdr, |
766 | }; | |
adaa70bb TG |
767 | |
768 | if (rt6_need_strict(&iph->daddr)) | |
769 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 770 | |
5578689a | 771 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
772 | } |
773 | ||
8ed67789 | 774 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 775 | struct flowi *fl, int flags) |
1da177e4 | 776 | { |
8ed67789 | 777 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
778 | } |
779 | ||
4591db4f DL |
780 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
781 | struct flowi *fl) | |
c71099ac TG |
782 | { |
783 | int flags = 0; | |
784 | ||
785 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 786 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 787 | |
adaa70bb TG |
788 | if (!ipv6_addr_any(&fl->fl6_src)) |
789 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
7cbca67c YH |
790 | else if (sk) { |
791 | unsigned int prefs = inet6_sk(sk)->srcprefs; | |
792 | if (prefs & IPV6_PREFER_SRC_TMP) | |
793 | flags |= RT6_LOOKUP_F_SRCPREF_TMP; | |
794 | if (prefs & IPV6_PREFER_SRC_PUBLIC) | |
795 | flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC; | |
796 | if (prefs & IPV6_PREFER_SRC_COA) | |
797 | flags |= RT6_LOOKUP_F_SRCPREF_COA; | |
798 | } | |
adaa70bb | 799 | |
4591db4f | 800 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
801 | } |
802 | ||
7159039a | 803 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 804 | |
14e50e57 DM |
805 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
806 | { | |
807 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
808 | struct rt6_info *rt = (struct rt6_info *) | |
809 | dst_alloc(&ip6_dst_blackhole_ops); | |
810 | struct dst_entry *new = NULL; | |
811 | ||
812 | if (rt) { | |
813 | new = &rt->u.dst; | |
814 | ||
815 | atomic_set(&new->__refcnt, 1); | |
816 | new->__use = 1; | |
352e512c HX |
817 | new->input = dst_discard; |
818 | new->output = dst_discard; | |
14e50e57 DM |
819 | |
820 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
821 | new->dev = ort->u.dst.dev; | |
822 | if (new->dev) | |
823 | dev_hold(new->dev); | |
824 | rt->rt6i_idev = ort->rt6i_idev; | |
825 | if (rt->rt6i_idev) | |
826 | in6_dev_hold(rt->rt6i_idev); | |
827 | rt->rt6i_expires = 0; | |
828 | ||
829 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
830 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
831 | rt->rt6i_metric = 0; | |
832 | ||
833 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
834 | #ifdef CONFIG_IPV6_SUBTREES | |
835 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
836 | #endif | |
837 | ||
838 | dst_free(new); | |
839 | } | |
840 | ||
841 | dst_release(*dstp); | |
842 | *dstp = new; | |
843 | return (new ? 0 : -ENOMEM); | |
844 | } | |
845 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
846 | ||
1da177e4 LT |
847 | /* |
848 | * Destination cache support functions | |
849 | */ | |
850 | ||
851 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
852 | { | |
853 | struct rt6_info *rt; | |
854 | ||
855 | rt = (struct rt6_info *) dst; | |
856 | ||
857 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
858 | return dst; | |
859 | ||
860 | return NULL; | |
861 | } | |
862 | ||
863 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
864 | { | |
865 | struct rt6_info *rt = (struct rt6_info *) dst; | |
866 | ||
867 | if (rt) { | |
868 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 869 | ip6_del_rt(rt); |
1da177e4 LT |
870 | else |
871 | dst_release(dst); | |
872 | } | |
873 | return NULL; | |
874 | } | |
875 | ||
876 | static void ip6_link_failure(struct sk_buff *skb) | |
877 | { | |
878 | struct rt6_info *rt; | |
879 | ||
880 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
881 | ||
882 | rt = (struct rt6_info *) skb->dst; | |
883 | if (rt) { | |
884 | if (rt->rt6i_flags&RTF_CACHE) { | |
885 | dst_set_expires(&rt->u.dst, 0); | |
886 | rt->rt6i_flags |= RTF_EXPIRES; | |
887 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
888 | rt->rt6i_node->fn_sernum = -1; | |
889 | } | |
890 | } | |
891 | ||
892 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
893 | { | |
894 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
895 | ||
896 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
897 | rt6->rt6i_flags |= RTF_MODIFIED; | |
898 | if (mtu < IPV6_MIN_MTU) { | |
899 | mtu = IPV6_MIN_MTU; | |
900 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
901 | } | |
902 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 903 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
904 | } |
905 | } | |
906 | ||
1da177e4 LT |
907 | static int ipv6_get_mtu(struct net_device *dev); |
908 | ||
5578689a | 909 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
910 | { |
911 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
912 | ||
5578689a DL |
913 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
914 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
915 | |
916 | /* | |
1ab1457c YH |
917 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
918 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
919 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
920 | * rely only on pmtu discovery" |
921 | */ | |
922 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
923 | mtu = IPV6_MAXPLEN; | |
924 | return mtu; | |
925 | } | |
926 | ||
3b00944c YH |
927 | static struct dst_entry *icmp6_dst_gc_list; |
928 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 929 | |
3b00944c | 930 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 931 | struct neighbour *neigh, |
9acd9f3a | 932 | const struct in6_addr *addr) |
1da177e4 LT |
933 | { |
934 | struct rt6_info *rt; | |
935 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 936 | struct net *net = dev_net(dev); |
1da177e4 LT |
937 | |
938 | if (unlikely(idev == NULL)) | |
939 | return NULL; | |
940 | ||
f2fc6a54 | 941 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
942 | if (unlikely(rt == NULL)) { |
943 | in6_dev_put(idev); | |
944 | goto out; | |
945 | } | |
946 | ||
947 | dev_hold(dev); | |
948 | if (neigh) | |
949 | neigh_hold(neigh); | |
950 | else | |
951 | neigh = ndisc_get_neigh(dev, addr); | |
952 | ||
953 | rt->rt6i_dev = dev; | |
954 | rt->rt6i_idev = idev; | |
955 | rt->rt6i_nexthop = neigh; | |
956 | atomic_set(&rt->u.dst.__refcnt, 1); | |
957 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
958 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 959 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 960 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
961 | |
962 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
963 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
964 | ? DST_HOST | |
1da177e4 LT |
965 | : 0; |
966 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
967 | rt->rt6i_dst.plen = 128; | |
968 | #endif | |
969 | ||
3b00944c YH |
970 | spin_lock_bh(&icmp6_dst_lock); |
971 | rt->u.dst.next = icmp6_dst_gc_list; | |
972 | icmp6_dst_gc_list = &rt->u.dst; | |
973 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 974 | |
5578689a | 975 | fib6_force_start_gc(net); |
1da177e4 LT |
976 | |
977 | out: | |
40aa7b90 | 978 | return &rt->u.dst; |
1da177e4 LT |
979 | } |
980 | ||
3d0f24a7 | 981 | int icmp6_dst_gc(void) |
1da177e4 LT |
982 | { |
983 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 984 | int more = 0; |
1da177e4 LT |
985 | |
986 | next = NULL; | |
5d0bbeeb | 987 | |
3b00944c YH |
988 | spin_lock_bh(&icmp6_dst_lock); |
989 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 990 | |
1da177e4 LT |
991 | while ((dst = *pprev) != NULL) { |
992 | if (!atomic_read(&dst->__refcnt)) { | |
993 | *pprev = dst->next; | |
994 | dst_free(dst); | |
1da177e4 LT |
995 | } else { |
996 | pprev = &dst->next; | |
3d0f24a7 | 997 | ++more; |
1da177e4 LT |
998 | } |
999 | } | |
1000 | ||
3b00944c | 1001 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1002 | |
3d0f24a7 | 1003 | return more; |
1da177e4 LT |
1004 | } |
1005 | ||
1e493d19 DM |
1006 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1007 | void *arg) | |
1008 | { | |
1009 | struct dst_entry *dst, **pprev; | |
1010 | ||
1011 | spin_lock_bh(&icmp6_dst_lock); | |
1012 | pprev = &icmp6_dst_gc_list; | |
1013 | while ((dst = *pprev) != NULL) { | |
1014 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1015 | if (func(rt, arg)) { | |
1016 | *pprev = dst->next; | |
1017 | dst_free(dst); | |
1018 | } else { | |
1019 | pprev = &dst->next; | |
1020 | } | |
1021 | } | |
1022 | spin_unlock_bh(&icmp6_dst_lock); | |
1023 | } | |
1024 | ||
569d3645 | 1025 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1026 | { |
1da177e4 | 1027 | unsigned long now = jiffies; |
7019b78e DL |
1028 | struct net *net = ops->dst_net; |
1029 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
1030 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1031 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1032 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1033 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1034 | ||
1035 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1036 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1037 | goto out; |
1038 | ||
6891a346 BT |
1039 | net->ipv6.ip6_rt_gc_expire++; |
1040 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1041 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1042 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1043 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1044 | out: |
7019b78e DL |
1045 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1046 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1050 | but results in cleaner routing tables. | |
1051 | ||
1052 | Remove it only when all the things will work! | |
1053 | */ | |
1054 | ||
1055 | static int ipv6_get_mtu(struct net_device *dev) | |
1056 | { | |
1057 | int mtu = IPV6_MIN_MTU; | |
1058 | struct inet6_dev *idev; | |
1059 | ||
1060 | idev = in6_dev_get(dev); | |
1061 | if (idev) { | |
1062 | mtu = idev->cnf.mtu6; | |
1063 | in6_dev_put(idev); | |
1064 | } | |
1065 | return mtu; | |
1066 | } | |
1067 | ||
6b75d090 | 1068 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1069 | { |
6b75d090 YH |
1070 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1071 | if (hoplimit < 0) { | |
1072 | struct net_device *dev = dst->dev; | |
1073 | struct inet6_dev *idev = in6_dev_get(dev); | |
1074 | if (idev) { | |
1075 | hoplimit = idev->cnf.hop_limit; | |
1076 | in6_dev_put(idev); | |
1077 | } else | |
53b7997f | 1078 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
1da177e4 LT |
1079 | } |
1080 | return hoplimit; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * | |
1085 | */ | |
1086 | ||
86872cb5 | 1087 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1088 | { |
1089 | int err; | |
5578689a | 1090 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1091 | struct rt6_info *rt = NULL; |
1092 | struct net_device *dev = NULL; | |
1093 | struct inet6_dev *idev = NULL; | |
c71099ac | 1094 | struct fib6_table *table; |
1da177e4 LT |
1095 | int addr_type; |
1096 | ||
86872cb5 | 1097 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1098 | return -EINVAL; |
1099 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1100 | if (cfg->fc_src_len) |
1da177e4 LT |
1101 | return -EINVAL; |
1102 | #endif | |
86872cb5 | 1103 | if (cfg->fc_ifindex) { |
1da177e4 | 1104 | err = -ENODEV; |
5578689a | 1105 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1106 | if (!dev) |
1107 | goto out; | |
1108 | idev = in6_dev_get(dev); | |
1109 | if (!idev) | |
1110 | goto out; | |
1111 | } | |
1112 | ||
86872cb5 TG |
1113 | if (cfg->fc_metric == 0) |
1114 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1115 | |
5578689a | 1116 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1117 | if (table == NULL) { |
1118 | err = -ENOBUFS; | |
1119 | goto out; | |
1120 | } | |
1121 | ||
f2fc6a54 | 1122 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1123 | |
1124 | if (rt == NULL) { | |
1125 | err = -ENOMEM; | |
1126 | goto out; | |
1127 | } | |
1128 | ||
1129 | rt->u.dst.obsolete = -1; | |
6f704992 YH |
1130 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1131 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1132 | 0; | |
1da177e4 | 1133 | |
86872cb5 TG |
1134 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1135 | cfg->fc_protocol = RTPROT_BOOT; | |
1136 | rt->rt6i_protocol = cfg->fc_protocol; | |
1137 | ||
1138 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1139 | |
1140 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1141 | rt->u.dst.input = ip6_mc_input; | |
1142 | else | |
1143 | rt->u.dst.input = ip6_forward; | |
1144 | ||
1145 | rt->u.dst.output = ip6_output; | |
1146 | ||
86872cb5 TG |
1147 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1148 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1149 | if (rt->rt6i_dst.plen == 128) |
1150 | rt->u.dst.flags = DST_HOST; | |
1151 | ||
1152 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1153 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1154 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1155 | #endif |
1156 | ||
86872cb5 | 1157 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1158 | |
1159 | /* We cannot add true routes via loopback here, | |
1160 | they would result in kernel looping; promote them to reject routes | |
1161 | */ | |
86872cb5 | 1162 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1163 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1164 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1165 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1166 | if (dev) { |
1167 | dev_put(dev); | |
1168 | in6_dev_put(idev); | |
1169 | } | |
5578689a | 1170 | dev = net->loopback_dev; |
1da177e4 LT |
1171 | dev_hold(dev); |
1172 | idev = in6_dev_get(dev); | |
1173 | if (!idev) { | |
1174 | err = -ENODEV; | |
1175 | goto out; | |
1176 | } | |
1177 | } | |
1178 | rt->u.dst.output = ip6_pkt_discard_out; | |
1179 | rt->u.dst.input = ip6_pkt_discard; | |
1180 | rt->u.dst.error = -ENETUNREACH; | |
1181 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1182 | goto install_route; | |
1183 | } | |
1184 | ||
86872cb5 | 1185 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1186 | struct in6_addr *gw_addr; |
1187 | int gwa_type; | |
1188 | ||
86872cb5 TG |
1189 | gw_addr = &cfg->fc_gateway; |
1190 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1191 | gwa_type = ipv6_addr_type(gw_addr); |
1192 | ||
1193 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1194 | struct rt6_info *grt; | |
1195 | ||
1196 | /* IPv6 strictly inhibits using not link-local | |
1197 | addresses as nexthop address. | |
1198 | Otherwise, router will not able to send redirects. | |
1199 | It is very good, but in some (rare!) circumstances | |
1200 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1201 | some exceptions. --ANK | |
1202 | */ | |
1203 | err = -EINVAL; | |
1204 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1205 | goto out; | |
1206 | ||
5578689a | 1207 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1208 | |
1209 | err = -EHOSTUNREACH; | |
1210 | if (grt == NULL) | |
1211 | goto out; | |
1212 | if (dev) { | |
1213 | if (dev != grt->rt6i_dev) { | |
1214 | dst_release(&grt->u.dst); | |
1215 | goto out; | |
1216 | } | |
1217 | } else { | |
1218 | dev = grt->rt6i_dev; | |
1219 | idev = grt->rt6i_idev; | |
1220 | dev_hold(dev); | |
1221 | in6_dev_hold(grt->rt6i_idev); | |
1222 | } | |
1223 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1224 | err = 0; | |
1225 | dst_release(&grt->u.dst); | |
1226 | ||
1227 | if (err) | |
1228 | goto out; | |
1229 | } | |
1230 | err = -EINVAL; | |
1231 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1232 | goto out; | |
1233 | } | |
1234 | ||
1235 | err = -ENODEV; | |
1236 | if (dev == NULL) | |
1237 | goto out; | |
1238 | ||
86872cb5 | 1239 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1240 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1241 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1242 | err = PTR_ERR(rt->rt6i_nexthop); | |
1243 | rt->rt6i_nexthop = NULL; | |
1244 | goto out; | |
1245 | } | |
1246 | } | |
1247 | ||
86872cb5 | 1248 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1249 | |
1250 | install_route: | |
86872cb5 TG |
1251 | if (cfg->fc_mx) { |
1252 | struct nlattr *nla; | |
1253 | int remaining; | |
1254 | ||
1255 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1256 | int type = nla_type(nla); |
86872cb5 TG |
1257 | |
1258 | if (type) { | |
1259 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1260 | err = -EINVAL; |
1261 | goto out; | |
1262 | } | |
86872cb5 TG |
1263 | |
1264 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1265 | } |
1da177e4 LT |
1266 | } |
1267 | } | |
1268 | ||
5ffc02a1 | 1269 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1270 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1ca615fb | 1271 | if (!dst_mtu(&rt->u.dst)) |
1da177e4 | 1272 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
5ffc02a1 | 1273 | if (!dst_metric(&rt->u.dst, RTAX_ADVMSS)) |
5578689a | 1274 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1275 | rt->u.dst.dev = dev; |
1276 | rt->rt6i_idev = idev; | |
c71099ac | 1277 | rt->rt6i_table = table; |
63152fc0 | 1278 | |
c346dca1 | 1279 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1280 | |
86872cb5 | 1281 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1282 | |
1283 | out: | |
1284 | if (dev) | |
1285 | dev_put(dev); | |
1286 | if (idev) | |
1287 | in6_dev_put(idev); | |
1288 | if (rt) | |
40aa7b90 | 1289 | dst_free(&rt->u.dst); |
1da177e4 LT |
1290 | return err; |
1291 | } | |
1292 | ||
86872cb5 | 1293 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1294 | { |
1295 | int err; | |
c71099ac | 1296 | struct fib6_table *table; |
c346dca1 | 1297 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1298 | |
8ed67789 | 1299 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1300 | return -ENOENT; |
1301 | ||
c71099ac TG |
1302 | table = rt->rt6i_table; |
1303 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1304 | |
86872cb5 | 1305 | err = fib6_del(rt, info); |
1da177e4 LT |
1306 | dst_release(&rt->u.dst); |
1307 | ||
c71099ac | 1308 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1309 | |
1310 | return err; | |
1311 | } | |
1312 | ||
e0a1ad73 TG |
1313 | int ip6_del_rt(struct rt6_info *rt) |
1314 | { | |
4d1169c1 | 1315 | struct nl_info info = { |
c346dca1 | 1316 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1317 | }; |
528c4ceb | 1318 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1319 | } |
1320 | ||
86872cb5 | 1321 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1322 | { |
c71099ac | 1323 | struct fib6_table *table; |
1da177e4 LT |
1324 | struct fib6_node *fn; |
1325 | struct rt6_info *rt; | |
1326 | int err = -ESRCH; | |
1327 | ||
5578689a | 1328 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1329 | if (table == NULL) |
1330 | return err; | |
1331 | ||
1332 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1333 | |
c71099ac | 1334 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1335 | &cfg->fc_dst, cfg->fc_dst_len, |
1336 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1337 | |
1da177e4 | 1338 | if (fn) { |
7cc48263 | 1339 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1340 | if (cfg->fc_ifindex && |
1da177e4 | 1341 | (rt->rt6i_dev == NULL || |
86872cb5 | 1342 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1343 | continue; |
86872cb5 TG |
1344 | if (cfg->fc_flags & RTF_GATEWAY && |
1345 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1346 | continue; |
86872cb5 | 1347 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1348 | continue; |
1349 | dst_hold(&rt->u.dst); | |
c71099ac | 1350 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1351 | |
86872cb5 | 1352 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1353 | } |
1354 | } | |
c71099ac | 1355 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1356 | |
1357 | return err; | |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * Handle redirects | |
1362 | */ | |
a6279458 YH |
1363 | struct ip6rd_flowi { |
1364 | struct flowi fl; | |
1365 | struct in6_addr gateway; | |
1366 | }; | |
1367 | ||
8ed67789 DL |
1368 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1369 | struct fib6_table *table, | |
a6279458 YH |
1370 | struct flowi *fl, |
1371 | int flags) | |
1da177e4 | 1372 | { |
a6279458 YH |
1373 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1374 | struct rt6_info *rt; | |
e843b9e1 | 1375 | struct fib6_node *fn; |
c71099ac | 1376 | |
1da177e4 | 1377 | /* |
e843b9e1 YH |
1378 | * Get the "current" route for this destination and |
1379 | * check if the redirect has come from approriate router. | |
1380 | * | |
1381 | * RFC 2461 specifies that redirects should only be | |
1382 | * accepted if they come from the nexthop to the target. | |
1383 | * Due to the way the routes are chosen, this notion | |
1384 | * is a bit fuzzy and one might need to check all possible | |
1385 | * routes. | |
1da177e4 | 1386 | */ |
1da177e4 | 1387 | |
c71099ac | 1388 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1389 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1390 | restart: |
7cc48263 | 1391 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1392 | /* |
1393 | * Current route is on-link; redirect is always invalid. | |
1394 | * | |
1395 | * Seems, previous statement is not true. It could | |
1396 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1397 | * But then router serving it might decide, that we should | |
1398 | * know truth 8)8) --ANK (980726). | |
1399 | */ | |
1400 | if (rt6_check_expired(rt)) | |
1401 | continue; | |
1402 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1403 | continue; | |
a6279458 | 1404 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1405 | continue; |
a6279458 | 1406 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1407 | continue; |
1408 | break; | |
1409 | } | |
a6279458 | 1410 | |
cb15d9c2 | 1411 | if (!rt) |
8ed67789 DL |
1412 | rt = net->ipv6.ip6_null_entry; |
1413 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1414 | out: |
a6279458 YH |
1415 | dst_hold(&rt->u.dst); |
1416 | ||
c71099ac | 1417 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1418 | |
a6279458 YH |
1419 | return rt; |
1420 | }; | |
1421 | ||
1422 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1423 | struct in6_addr *src, | |
1424 | struct in6_addr *gateway, | |
1425 | struct net_device *dev) | |
1426 | { | |
adaa70bb | 1427 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1428 | struct net *net = dev_net(dev); |
a6279458 YH |
1429 | struct ip6rd_flowi rdfl = { |
1430 | .fl = { | |
1431 | .oif = dev->ifindex, | |
1432 | .nl_u = { | |
1433 | .ip6_u = { | |
1434 | .daddr = *dest, | |
1435 | .saddr = *src, | |
1436 | }, | |
1437 | }, | |
1438 | }, | |
1439 | .gateway = *gateway, | |
1440 | }; | |
adaa70bb TG |
1441 | |
1442 | if (rt6_need_strict(dest)) | |
1443 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1444 | |
5578689a | 1445 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1446 | flags, __ip6_route_redirect); |
a6279458 YH |
1447 | } |
1448 | ||
1449 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1450 | struct in6_addr *saddr, | |
1451 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1452 | { | |
1453 | struct rt6_info *rt, *nrt = NULL; | |
1454 | struct netevent_redirect netevent; | |
c346dca1 | 1455 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1456 | |
1457 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1458 | ||
8ed67789 | 1459 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1460 | if (net_ratelimit()) |
1461 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1462 | "for redirect target\n"); | |
a6279458 | 1463 | goto out; |
1da177e4 LT |
1464 | } |
1465 | ||
1da177e4 LT |
1466 | /* |
1467 | * We have finally decided to accept it. | |
1468 | */ | |
1469 | ||
1ab1457c | 1470 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1471 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1472 | NEIGH_UPDATE_F_OVERRIDE| | |
1473 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1474 | NEIGH_UPDATE_F_ISROUTER)) | |
1475 | ); | |
1476 | ||
1477 | /* | |
1478 | * Redirect received -> path was valid. | |
1479 | * Look, redirects are sent only in response to data packets, | |
1480 | * so that this nexthop apparently is reachable. --ANK | |
1481 | */ | |
1482 | dst_confirm(&rt->u.dst); | |
1483 | ||
1484 | /* Duplicate redirect: silently ignore. */ | |
1485 | if (neigh == rt->u.dst.neighbour) | |
1486 | goto out; | |
1487 | ||
1488 | nrt = ip6_rt_copy(rt); | |
1489 | if (nrt == NULL) | |
1490 | goto out; | |
1491 | ||
1492 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1493 | if (on_link) | |
1494 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1495 | ||
1496 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1497 | nrt->rt6i_dst.plen = 128; | |
1498 | nrt->u.dst.flags |= DST_HOST; | |
1499 | ||
1500 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1501 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1502 | /* Reset pmtu, it may be better */ | |
1503 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
c346dca1 | 1504 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), |
5578689a | 1505 | dst_mtu(&nrt->u.dst)); |
1da177e4 | 1506 | |
40e22e8f | 1507 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1508 | goto out; |
1509 | ||
8d71740c TT |
1510 | netevent.old = &rt->u.dst; |
1511 | netevent.new = &nrt->u.dst; | |
1512 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1513 | ||
1da177e4 | 1514 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1515 | ip6_del_rt(rt); |
1da177e4 LT |
1516 | return; |
1517 | } | |
1518 | ||
1519 | out: | |
1ab1457c | 1520 | dst_release(&rt->u.dst); |
1da177e4 LT |
1521 | return; |
1522 | } | |
1523 | ||
1524 | /* | |
1525 | * Handle ICMP "packet too big" messages | |
1526 | * i.e. Path MTU discovery | |
1527 | */ | |
1528 | ||
1529 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1530 | struct net_device *dev, u32 pmtu) | |
1531 | { | |
1532 | struct rt6_info *rt, *nrt; | |
c346dca1 | 1533 | struct net *net = dev_net(dev); |
1da177e4 LT |
1534 | int allfrag = 0; |
1535 | ||
5578689a | 1536 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1537 | if (rt == NULL) |
1538 | return; | |
1539 | ||
1540 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1541 | goto out; | |
1542 | ||
1543 | if (pmtu < IPV6_MIN_MTU) { | |
1544 | /* | |
1ab1457c | 1545 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1546 | * MTU (1280) and a fragment header should always be included |
1547 | * after a node receiving Too Big message reporting PMTU is | |
1548 | * less than the IPv6 Minimum Link MTU. | |
1549 | */ | |
1550 | pmtu = IPV6_MIN_MTU; | |
1551 | allfrag = 1; | |
1552 | } | |
1553 | ||
1554 | /* New mtu received -> path was valid. | |
1555 | They are sent only in response to data packets, | |
1556 | so that this nexthop apparently is reachable. --ANK | |
1557 | */ | |
1558 | dst_confirm(&rt->u.dst); | |
1559 | ||
1560 | /* Host route. If it is static, it would be better | |
1561 | not to override it, but add new one, so that | |
1562 | when cache entry will expire old pmtu | |
1563 | would return automatically. | |
1564 | */ | |
1565 | if (rt->rt6i_flags & RTF_CACHE) { | |
1566 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1567 | if (allfrag) | |
1568 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1569 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1570 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1571 | goto out; | |
1572 | } | |
1573 | ||
1574 | /* Network route. | |
1575 | Two cases are possible: | |
1576 | 1. It is connected route. Action: COW | |
1577 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1578 | */ | |
d5315b50 | 1579 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1580 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1581 | else |
1582 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1583 | |
d5315b50 | 1584 | if (nrt) { |
a1e78363 YH |
1585 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1586 | if (allfrag) | |
1587 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1588 | ||
1589 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1590 | * happened within 5 mins, the recommended timer is 10 mins. | |
1591 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1592 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1593 | * and detecting PMTU increase will be automatically happened. | |
1594 | */ | |
5578689a | 1595 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1596 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1597 | ||
40e22e8f | 1598 | ip6_ins_rt(nrt); |
1da177e4 | 1599 | } |
1da177e4 LT |
1600 | out: |
1601 | dst_release(&rt->u.dst); | |
1602 | } | |
1603 | ||
1604 | /* | |
1605 | * Misc support functions | |
1606 | */ | |
1607 | ||
1608 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1609 | { | |
c346dca1 | 1610 | struct net *net = dev_net(ort->rt6i_dev); |
f2fc6a54 | 1611 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1612 | |
1613 | if (rt) { | |
1614 | rt->u.dst.input = ort->u.dst.input; | |
1615 | rt->u.dst.output = ort->u.dst.output; | |
1616 | ||
1617 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1618 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1619 | rt->u.dst.dev = ort->u.dst.dev; |
1620 | if (rt->u.dst.dev) | |
1621 | dev_hold(rt->u.dst.dev); | |
1622 | rt->rt6i_idev = ort->rt6i_idev; | |
1623 | if (rt->rt6i_idev) | |
1624 | in6_dev_hold(rt->rt6i_idev); | |
1625 | rt->u.dst.lastuse = jiffies; | |
1626 | rt->rt6i_expires = 0; | |
1627 | ||
1628 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1629 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1630 | rt->rt6i_metric = 0; | |
1631 | ||
1632 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1633 | #ifdef CONFIG_IPV6_SUBTREES | |
1634 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1635 | #endif | |
c71099ac | 1636 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1637 | } |
1638 | return rt; | |
1639 | } | |
1640 | ||
70ceb4f5 | 1641 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1642 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1643 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1644 | struct in6_addr *gwaddr, int ifindex) |
1645 | { | |
1646 | struct fib6_node *fn; | |
1647 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1648 | struct fib6_table *table; |
1649 | ||
efa2cea0 | 1650 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1651 | if (table == NULL) |
1652 | return NULL; | |
70ceb4f5 | 1653 | |
c71099ac TG |
1654 | write_lock_bh(&table->tb6_lock); |
1655 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1656 | if (!fn) |
1657 | goto out; | |
1658 | ||
7cc48263 | 1659 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1660 | if (rt->rt6i_dev->ifindex != ifindex) |
1661 | continue; | |
1662 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1663 | continue; | |
1664 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1665 | continue; | |
1666 | dst_hold(&rt->u.dst); | |
1667 | break; | |
1668 | } | |
1669 | out: | |
c71099ac | 1670 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1671 | return rt; |
1672 | } | |
1673 | ||
efa2cea0 DL |
1674 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1675 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1676 | struct in6_addr *gwaddr, int ifindex, |
1677 | unsigned pref) | |
1678 | { | |
86872cb5 TG |
1679 | struct fib6_config cfg = { |
1680 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1681 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1682 | .fc_ifindex = ifindex, |
1683 | .fc_dst_len = prefixlen, | |
1684 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1685 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1686 | .fc_nlinfo.pid = 0, |
1687 | .fc_nlinfo.nlh = NULL, | |
1688 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1689 | }; |
1690 | ||
1691 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1692 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1693 | |
e317da96 YH |
1694 | /* We should treat it as a default route if prefix length is 0. */ |
1695 | if (!prefixlen) | |
86872cb5 | 1696 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1697 | |
86872cb5 | 1698 | ip6_route_add(&cfg); |
70ceb4f5 | 1699 | |
efa2cea0 | 1700 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1701 | } |
1702 | #endif | |
1703 | ||
1da177e4 | 1704 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1705 | { |
1da177e4 | 1706 | struct rt6_info *rt; |
c71099ac | 1707 | struct fib6_table *table; |
1da177e4 | 1708 | |
c346dca1 | 1709 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1710 | if (table == NULL) |
1711 | return NULL; | |
1da177e4 | 1712 | |
c71099ac | 1713 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1714 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1715 | if (dev == rt->rt6i_dev && |
045927ff | 1716 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1717 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1718 | break; | |
1719 | } | |
1720 | if (rt) | |
1721 | dst_hold(&rt->u.dst); | |
c71099ac | 1722 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1723 | return rt; |
1724 | } | |
1725 | ||
1726 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1727 | struct net_device *dev, |
1728 | unsigned int pref) | |
1da177e4 | 1729 | { |
86872cb5 TG |
1730 | struct fib6_config cfg = { |
1731 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1732 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1733 | .fc_ifindex = dev->ifindex, |
1734 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1735 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1736 | .fc_nlinfo.pid = 0, |
1737 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1738 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1739 | }; |
1da177e4 | 1740 | |
86872cb5 | 1741 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1742 | |
86872cb5 | 1743 | ip6_route_add(&cfg); |
1da177e4 | 1744 | |
1da177e4 LT |
1745 | return rt6_get_dflt_router(gwaddr, dev); |
1746 | } | |
1747 | ||
7b4da532 | 1748 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1749 | { |
1750 | struct rt6_info *rt; | |
c71099ac TG |
1751 | struct fib6_table *table; |
1752 | ||
1753 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1754 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1755 | if (table == NULL) |
1756 | return; | |
1da177e4 LT |
1757 | |
1758 | restart: | |
c71099ac | 1759 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1760 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1761 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1762 | dst_hold(&rt->u.dst); | |
c71099ac | 1763 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1764 | ip6_del_rt(rt); |
1da177e4 LT |
1765 | goto restart; |
1766 | } | |
1767 | } | |
c71099ac | 1768 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1769 | } |
1770 | ||
5578689a DL |
1771 | static void rtmsg_to_fib6_config(struct net *net, |
1772 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1773 | struct fib6_config *cfg) |
1774 | { | |
1775 | memset(cfg, 0, sizeof(*cfg)); | |
1776 | ||
1777 | cfg->fc_table = RT6_TABLE_MAIN; | |
1778 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1779 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1780 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1781 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1782 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1783 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1784 | ||
5578689a | 1785 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1786 | |
86872cb5 TG |
1787 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1788 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1789 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1790 | } | |
1791 | ||
5578689a | 1792 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1793 | { |
86872cb5 | 1794 | struct fib6_config cfg; |
1da177e4 LT |
1795 | struct in6_rtmsg rtmsg; |
1796 | int err; | |
1797 | ||
1798 | switch(cmd) { | |
1799 | case SIOCADDRT: /* Add a route */ | |
1800 | case SIOCDELRT: /* Delete a route */ | |
1801 | if (!capable(CAP_NET_ADMIN)) | |
1802 | return -EPERM; | |
1803 | err = copy_from_user(&rtmsg, arg, | |
1804 | sizeof(struct in6_rtmsg)); | |
1805 | if (err) | |
1806 | return -EFAULT; | |
86872cb5 | 1807 | |
5578689a | 1808 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1809 | |
1da177e4 LT |
1810 | rtnl_lock(); |
1811 | switch (cmd) { | |
1812 | case SIOCADDRT: | |
86872cb5 | 1813 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1814 | break; |
1815 | case SIOCDELRT: | |
86872cb5 | 1816 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1817 | break; |
1818 | default: | |
1819 | err = -EINVAL; | |
1820 | } | |
1821 | rtnl_unlock(); | |
1822 | ||
1823 | return err; | |
3ff50b79 | 1824 | } |
1da177e4 LT |
1825 | |
1826 | return -EINVAL; | |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * Drop the packet on the floor | |
1831 | */ | |
1832 | ||
50eb431d | 1833 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1834 | { |
612f09e8 | 1835 | int type; |
3bd653c8 | 1836 | struct dst_entry *dst = skb->dst; |
612f09e8 YH |
1837 | switch (ipstats_mib_noroutes) { |
1838 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1839 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 | 1840 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
3bd653c8 DL |
1841 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1842 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1843 | break; |
1844 | } | |
1845 | /* FALLTHROUGH */ | |
1846 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1847 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1848 | ipstats_mib_noroutes); | |
612f09e8 YH |
1849 | break; |
1850 | } | |
9ce8ade0 | 1851 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1852 | kfree_skb(skb); |
1853 | return 0; | |
1854 | } | |
1855 | ||
9ce8ade0 TG |
1856 | static int ip6_pkt_discard(struct sk_buff *skb) |
1857 | { | |
612f09e8 | 1858 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1859 | } |
1860 | ||
20380731 | 1861 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1862 | { |
1863 | skb->dev = skb->dst->dev; | |
612f09e8 | 1864 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1865 | } |
1866 | ||
6723ab54 DM |
1867 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1868 | ||
9ce8ade0 TG |
1869 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1870 | { | |
612f09e8 | 1871 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1872 | } |
1873 | ||
1874 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1875 | { | |
1876 | skb->dev = skb->dst->dev; | |
612f09e8 | 1877 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1878 | } |
1879 | ||
6723ab54 DM |
1880 | #endif |
1881 | ||
1da177e4 LT |
1882 | /* |
1883 | * Allocate a dst for local (unicast / anycast) address. | |
1884 | */ | |
1885 | ||
1886 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1887 | const struct in6_addr *addr, | |
1888 | int anycast) | |
1889 | { | |
c346dca1 | 1890 | struct net *net = dev_net(idev->dev); |
f2fc6a54 | 1891 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1892 | |
1893 | if (rt == NULL) | |
1894 | return ERR_PTR(-ENOMEM); | |
1895 | ||
5578689a | 1896 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1897 | in6_dev_hold(idev); |
1898 | ||
1899 | rt->u.dst.flags = DST_HOST; | |
1900 | rt->u.dst.input = ip6_input; | |
1901 | rt->u.dst.output = ip6_output; | |
5578689a | 1902 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1903 | rt->rt6i_idev = idev; |
1904 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1905 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1906 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1907 | rt->u.dst.obsolete = -1; | |
1908 | ||
1909 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1910 | if (anycast) |
1911 | rt->rt6i_flags |= RTF_ANYCAST; | |
1912 | else | |
1da177e4 LT |
1913 | rt->rt6i_flags |= RTF_LOCAL; |
1914 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1915 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1916 | dst_free(&rt->u.dst); |
1da177e4 LT |
1917 | return ERR_PTR(-ENOMEM); |
1918 | } | |
1919 | ||
1920 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1921 | rt->rt6i_dst.plen = 128; | |
5578689a | 1922 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1923 | |
1924 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1925 | ||
1926 | return rt; | |
1927 | } | |
1928 | ||
8ed67789 DL |
1929 | struct arg_dev_net { |
1930 | struct net_device *dev; | |
1931 | struct net *net; | |
1932 | }; | |
1933 | ||
1da177e4 LT |
1934 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1935 | { | |
8ed67789 DL |
1936 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1937 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1938 | ||
1939 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1940 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1941 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1942 | return -1; | |
1943 | } | |
1944 | return 0; | |
1945 | } | |
1946 | ||
f3db4851 | 1947 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1948 | { |
8ed67789 DL |
1949 | struct arg_dev_net adn = { |
1950 | .dev = dev, | |
1951 | .net = net, | |
1952 | }; | |
1953 | ||
1954 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 1955 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
1956 | } |
1957 | ||
1958 | struct rt6_mtu_change_arg | |
1959 | { | |
1960 | struct net_device *dev; | |
1961 | unsigned mtu; | |
1962 | }; | |
1963 | ||
1964 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1965 | { | |
1966 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1967 | struct inet6_dev *idev; | |
c346dca1 | 1968 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
1969 | |
1970 | /* In IPv6 pmtu discovery is not optional, | |
1971 | so that RTAX_MTU lock cannot disable it. | |
1972 | We still use this lock to block changes | |
1973 | caused by addrconf/ndisc. | |
1974 | */ | |
1975 | ||
1976 | idev = __in6_dev_get(arg->dev); | |
1977 | if (idev == NULL) | |
1978 | return 0; | |
1979 | ||
1980 | /* For administrative MTU increase, there is no way to discover | |
1981 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1982 | Since RFC 1981 doesn't include administrative MTU increase | |
1983 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1984 | */ | |
1985 | /* | |
1986 | If new MTU is less than route PMTU, this new MTU will be the | |
1987 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1988 | decreases; if new MTU is greater than route PMTU, and the | |
1989 | old MTU is the lowest MTU in the path, update the route PMTU | |
1990 | to reflect the increase. In this case if the other nodes' MTU | |
1991 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1992 | PMTU discouvery. | |
1993 | */ | |
1994 | if (rt->rt6i_dev == arg->dev && | |
1995 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1996 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1997 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1998 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1999 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 2000 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 2001 | } |
1da177e4 LT |
2002 | return 0; |
2003 | } | |
2004 | ||
2005 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2006 | { | |
c71099ac TG |
2007 | struct rt6_mtu_change_arg arg = { |
2008 | .dev = dev, | |
2009 | .mtu = mtu, | |
2010 | }; | |
1da177e4 | 2011 | |
c346dca1 | 2012 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2013 | } |
2014 | ||
ef7c79ed | 2015 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2016 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2017 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2018 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2019 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2020 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2021 | }; | |
2022 | ||
2023 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2024 | struct fib6_config *cfg) | |
1da177e4 | 2025 | { |
86872cb5 TG |
2026 | struct rtmsg *rtm; |
2027 | struct nlattr *tb[RTA_MAX+1]; | |
2028 | int err; | |
1da177e4 | 2029 | |
86872cb5 TG |
2030 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2031 | if (err < 0) | |
2032 | goto errout; | |
1da177e4 | 2033 | |
86872cb5 TG |
2034 | err = -EINVAL; |
2035 | rtm = nlmsg_data(nlh); | |
2036 | memset(cfg, 0, sizeof(*cfg)); | |
2037 | ||
2038 | cfg->fc_table = rtm->rtm_table; | |
2039 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2040 | cfg->fc_src_len = rtm->rtm_src_len; | |
2041 | cfg->fc_flags = RTF_UP; | |
2042 | cfg->fc_protocol = rtm->rtm_protocol; | |
2043 | ||
2044 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2045 | cfg->fc_flags |= RTF_REJECT; | |
2046 | ||
2047 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2048 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2049 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2050 | |
2051 | if (tb[RTA_GATEWAY]) { | |
2052 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2053 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2054 | } |
86872cb5 TG |
2055 | |
2056 | if (tb[RTA_DST]) { | |
2057 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2058 | ||
2059 | if (nla_len(tb[RTA_DST]) < plen) | |
2060 | goto errout; | |
2061 | ||
2062 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2063 | } |
86872cb5 TG |
2064 | |
2065 | if (tb[RTA_SRC]) { | |
2066 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2067 | ||
2068 | if (nla_len(tb[RTA_SRC]) < plen) | |
2069 | goto errout; | |
2070 | ||
2071 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2072 | } |
86872cb5 TG |
2073 | |
2074 | if (tb[RTA_OIF]) | |
2075 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2076 | ||
2077 | if (tb[RTA_PRIORITY]) | |
2078 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2079 | ||
2080 | if (tb[RTA_METRICS]) { | |
2081 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2082 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2083 | } |
86872cb5 TG |
2084 | |
2085 | if (tb[RTA_TABLE]) | |
2086 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2087 | ||
2088 | err = 0; | |
2089 | errout: | |
2090 | return err; | |
1da177e4 LT |
2091 | } |
2092 | ||
c127ea2c | 2093 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2094 | { |
86872cb5 TG |
2095 | struct fib6_config cfg; |
2096 | int err; | |
1da177e4 | 2097 | |
86872cb5 TG |
2098 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2099 | if (err < 0) | |
2100 | return err; | |
2101 | ||
2102 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2103 | } |
2104 | ||
c127ea2c | 2105 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2106 | { |
86872cb5 TG |
2107 | struct fib6_config cfg; |
2108 | int err; | |
1da177e4 | 2109 | |
86872cb5 TG |
2110 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2111 | if (err < 0) | |
2112 | return err; | |
2113 | ||
2114 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2115 | } |
2116 | ||
339bf98f TG |
2117 | static inline size_t rt6_nlmsg_size(void) |
2118 | { | |
2119 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2120 | + nla_total_size(16) /* RTA_SRC */ | |
2121 | + nla_total_size(16) /* RTA_DST */ | |
2122 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2123 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2124 | + nla_total_size(4) /* RTA_TABLE */ | |
2125 | + nla_total_size(4) /* RTA_IIF */ | |
2126 | + nla_total_size(4) /* RTA_OIF */ | |
2127 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2128 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2129 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2130 | } | |
2131 | ||
191cd582 BH |
2132 | static int rt6_fill_node(struct net *net, |
2133 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2134 | struct in6_addr *dst, struct in6_addr *src, |
2135 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2136 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2137 | { |
2138 | struct rtmsg *rtm; | |
2d7202bf | 2139 | struct nlmsghdr *nlh; |
e3703b3d | 2140 | long expires; |
9e762a4a | 2141 | u32 table; |
1da177e4 LT |
2142 | |
2143 | if (prefix) { /* user wants prefix routes only */ | |
2144 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2145 | /* success since this is not a prefix route */ | |
2146 | return 1; | |
2147 | } | |
2148 | } | |
2149 | ||
2d7202bf TG |
2150 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2151 | if (nlh == NULL) | |
26932566 | 2152 | return -EMSGSIZE; |
2d7202bf TG |
2153 | |
2154 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2155 | rtm->rtm_family = AF_INET6; |
2156 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2157 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2158 | rtm->rtm_tos = 0; | |
c71099ac | 2159 | if (rt->rt6i_table) |
9e762a4a | 2160 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2161 | else |
9e762a4a PM |
2162 | table = RT6_TABLE_UNSPEC; |
2163 | rtm->rtm_table = table; | |
2d7202bf | 2164 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2165 | if (rt->rt6i_flags&RTF_REJECT) |
2166 | rtm->rtm_type = RTN_UNREACHABLE; | |
2167 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2168 | rtm->rtm_type = RTN_LOCAL; | |
2169 | else | |
2170 | rtm->rtm_type = RTN_UNICAST; | |
2171 | rtm->rtm_flags = 0; | |
2172 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2173 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2174 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2175 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2176 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2177 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2178 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2179 | rtm->rtm_protocol = RTPROT_RA; | |
2180 | ||
2181 | if (rt->rt6i_flags&RTF_CACHE) | |
2182 | rtm->rtm_flags |= RTM_F_CLONED; | |
2183 | ||
2184 | if (dst) { | |
2d7202bf | 2185 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2186 | rtm->rtm_dst_len = 128; |
1da177e4 | 2187 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2188 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2189 | #ifdef CONFIG_IPV6_SUBTREES |
2190 | if (src) { | |
2d7202bf | 2191 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2192 | rtm->rtm_src_len = 128; |
1da177e4 | 2193 | } else if (rtm->rtm_src_len) |
2d7202bf | 2194 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2195 | #endif |
7bc570c8 YH |
2196 | if (iif) { |
2197 | #ifdef CONFIG_IPV6_MROUTE | |
2198 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
2199 | int err = ip6mr_get_route(skb, rtm, nowait); | |
2200 | if (err <= 0) { | |
2201 | if (!nowait) { | |
2202 | if (err == 0) | |
2203 | return 0; | |
2204 | goto nla_put_failure; | |
2205 | } else { | |
2206 | if (err == -EMSGSIZE) | |
2207 | goto nla_put_failure; | |
2208 | } | |
2209 | } | |
2210 | } else | |
2211 | #endif | |
2212 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2213 | } else if (dst) { | |
5e0115e5 | 2214 | struct inet6_dev *idev = ip6_dst_idev(&rt->u.dst); |
1da177e4 | 2215 | struct in6_addr saddr_buf; |
191cd582 | 2216 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2217 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2218 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2219 | } |
2d7202bf | 2220 | |
1da177e4 | 2221 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2222 | goto nla_put_failure; |
2223 | ||
1da177e4 | 2224 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2225 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2226 | ||
1da177e4 | 2227 | if (rt->u.dst.dev) |
2d7202bf TG |
2228 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2229 | ||
2230 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2231 | |
36e3deae YH |
2232 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2233 | expires = 0; | |
2234 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2235 | expires = rt->rt6i_expires - jiffies; | |
2236 | else | |
2237 | expires = INT_MAX; | |
69cdf8f9 | 2238 | |
e3703b3d TG |
2239 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, |
2240 | expires, rt->u.dst.error) < 0) | |
2241 | goto nla_put_failure; | |
2d7202bf TG |
2242 | |
2243 | return nlmsg_end(skb, nlh); | |
2244 | ||
2245 | nla_put_failure: | |
26932566 PM |
2246 | nlmsg_cancel(skb, nlh); |
2247 | return -EMSGSIZE; | |
1da177e4 LT |
2248 | } |
2249 | ||
1b43af54 | 2250 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2251 | { |
2252 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2253 | int prefix; | |
2254 | ||
2d7202bf TG |
2255 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2256 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2257 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2258 | } else | |
2259 | prefix = 0; | |
2260 | ||
191cd582 BH |
2261 | return rt6_fill_node(arg->net, |
2262 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2263 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2264 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2265 | } |
2266 | ||
c127ea2c | 2267 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2268 | { |
3b1e0a65 | 2269 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2270 | struct nlattr *tb[RTA_MAX+1]; |
2271 | struct rt6_info *rt; | |
1da177e4 | 2272 | struct sk_buff *skb; |
ab364a6f | 2273 | struct rtmsg *rtm; |
1da177e4 | 2274 | struct flowi fl; |
ab364a6f | 2275 | int err, iif = 0; |
1da177e4 | 2276 | |
ab364a6f TG |
2277 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2278 | if (err < 0) | |
2279 | goto errout; | |
1da177e4 | 2280 | |
ab364a6f | 2281 | err = -EINVAL; |
1da177e4 | 2282 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2283 | |
ab364a6f TG |
2284 | if (tb[RTA_SRC]) { |
2285 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2286 | goto errout; | |
2287 | ||
2288 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2289 | } | |
2290 | ||
2291 | if (tb[RTA_DST]) { | |
2292 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2293 | goto errout; | |
2294 | ||
2295 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2296 | } | |
2297 | ||
2298 | if (tb[RTA_IIF]) | |
2299 | iif = nla_get_u32(tb[RTA_IIF]); | |
2300 | ||
2301 | if (tb[RTA_OIF]) | |
2302 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2303 | |
2304 | if (iif) { | |
2305 | struct net_device *dev; | |
5578689a | 2306 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2307 | if (!dev) { |
2308 | err = -ENODEV; | |
ab364a6f | 2309 | goto errout; |
1da177e4 LT |
2310 | } |
2311 | } | |
2312 | ||
ab364a6f TG |
2313 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2314 | if (skb == NULL) { | |
2315 | err = -ENOBUFS; | |
2316 | goto errout; | |
2317 | } | |
1da177e4 | 2318 | |
ab364a6f TG |
2319 | /* Reserve room for dummy headers, this skb can pass |
2320 | through good chunk of routing engine. | |
2321 | */ | |
459a98ed | 2322 | skb_reset_mac_header(skb); |
ab364a6f | 2323 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2324 | |
8a3edd80 | 2325 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
2326 | skb->dst = &rt->u.dst; |
2327 | ||
191cd582 | 2328 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2329 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2330 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2331 | if (err < 0) { |
ab364a6f TG |
2332 | kfree_skb(skb); |
2333 | goto errout; | |
1da177e4 LT |
2334 | } |
2335 | ||
5578689a | 2336 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2337 | errout: |
1da177e4 | 2338 | return err; |
1da177e4 LT |
2339 | } |
2340 | ||
86872cb5 | 2341 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2342 | { |
2343 | struct sk_buff *skb; | |
5578689a | 2344 | struct net *net = info->nl_net; |
528c4ceb DL |
2345 | u32 seq; |
2346 | int err; | |
2347 | ||
2348 | err = -ENOBUFS; | |
2349 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2350 | |
339bf98f | 2351 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2352 | if (skb == NULL) |
2353 | goto errout; | |
2354 | ||
191cd582 | 2355 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2356 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2357 | if (err < 0) { |
2358 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2359 | WARN_ON(err == -EMSGSIZE); | |
2360 | kfree_skb(skb); | |
2361 | goto errout; | |
2362 | } | |
5578689a DL |
2363 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2364 | info->nlh, gfp_any()); | |
21713ebc TG |
2365 | errout: |
2366 | if (err < 0) | |
5578689a | 2367 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2368 | } |
2369 | ||
8ed67789 DL |
2370 | static int ip6_route_dev_notify(struct notifier_block *this, |
2371 | unsigned long event, void *data) | |
2372 | { | |
2373 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2374 | struct net *net = dev_net(dev); |
8ed67789 DL |
2375 | |
2376 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2377 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2378 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2379 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2380 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2381 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2382 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2383 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2384 | #endif | |
2385 | } | |
2386 | ||
2387 | return NOTIFY_OK; | |
2388 | } | |
2389 | ||
1da177e4 LT |
2390 | /* |
2391 | * /proc | |
2392 | */ | |
2393 | ||
2394 | #ifdef CONFIG_PROC_FS | |
2395 | ||
2396 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2397 | ||
2398 | struct rt6_proc_arg | |
2399 | { | |
2400 | char *buffer; | |
2401 | int offset; | |
2402 | int length; | |
2403 | int skip; | |
2404 | int len; | |
2405 | }; | |
2406 | ||
2407 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2408 | { | |
33120b30 | 2409 | struct seq_file *m = p_arg; |
1da177e4 | 2410 | |
4b7a4274 | 2411 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2412 | |
2413 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2414 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2415 | #else |
33120b30 | 2416 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2417 | #endif |
2418 | ||
2419 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2420 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2421 | } else { |
33120b30 | 2422 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2423 | } |
33120b30 AD |
2424 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2425 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2426 | rt->u.dst.__use, rt->rt6i_flags, | |
2427 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2428 | return 0; |
2429 | } | |
2430 | ||
33120b30 | 2431 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2432 | { |
f3db4851 DL |
2433 | struct net *net = (struct net *)m->private; |
2434 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2435 | return 0; |
2436 | } | |
1da177e4 | 2437 | |
33120b30 AD |
2438 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2439 | { | |
de05c557 | 2440 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2441 | } |
2442 | ||
33120b30 AD |
2443 | static const struct file_operations ipv6_route_proc_fops = { |
2444 | .owner = THIS_MODULE, | |
2445 | .open = ipv6_route_open, | |
2446 | .read = seq_read, | |
2447 | .llseek = seq_lseek, | |
b6fcbdb4 | 2448 | .release = single_release_net, |
33120b30 AD |
2449 | }; |
2450 | ||
1da177e4 LT |
2451 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2452 | { | |
69ddb805 | 2453 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2454 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2455 | net->ipv6.rt6_stats->fib_nodes, |
2456 | net->ipv6.rt6_stats->fib_route_nodes, | |
2457 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2458 | net->ipv6.rt6_stats->fib_rt_entries, | |
2459 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2460 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2461 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2462 | |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2467 | { | |
de05c557 | 2468 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2469 | } |
2470 | ||
9a32144e | 2471 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2472 | .owner = THIS_MODULE, |
2473 | .open = rt6_stats_seq_open, | |
2474 | .read = seq_read, | |
2475 | .llseek = seq_lseek, | |
b6fcbdb4 | 2476 | .release = single_release_net, |
1da177e4 LT |
2477 | }; |
2478 | #endif /* CONFIG_PROC_FS */ | |
2479 | ||
2480 | #ifdef CONFIG_SYSCTL | |
2481 | ||
1da177e4 LT |
2482 | static |
2483 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2484 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2485 | { | |
5b7c931d DL |
2486 | struct net *net = current->nsproxy->net_ns; |
2487 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2488 | if (write) { |
2489 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2490 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2491 | return 0; |
2492 | } else | |
2493 | return -EINVAL; | |
2494 | } | |
2495 | ||
760f2d01 | 2496 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2497 | { |
1da177e4 | 2498 | .procname = "flush", |
4990509f | 2499 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2500 | .maxlen = sizeof(int), |
89c8b3a1 | 2501 | .mode = 0200, |
1ab1457c | 2502 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2503 | }, |
2504 | { | |
2505 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2506 | .procname = "gc_thresh", | |
9a7ec3a9 | 2507 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2508 | .maxlen = sizeof(int), |
2509 | .mode = 0644, | |
1ab1457c | 2510 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2511 | }, |
2512 | { | |
2513 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2514 | .procname = "max_size", | |
4990509f | 2515 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2516 | .maxlen = sizeof(int), |
2517 | .mode = 0644, | |
1ab1457c | 2518 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2519 | }, |
2520 | { | |
2521 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2522 | .procname = "gc_min_interval", | |
4990509f | 2523 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2524 | .maxlen = sizeof(int), |
2525 | .mode = 0644, | |
1ab1457c | 2526 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2527 | .strategy = &sysctl_jiffies, |
2528 | }, | |
2529 | { | |
2530 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2531 | .procname = "gc_timeout", | |
4990509f | 2532 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
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_INTERVAL, | |
2540 | .procname = "gc_interval", | |
4990509f | 2541 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
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_ELASTICITY, | |
2549 | .procname = "gc_elasticity", | |
4990509f | 2550 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
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_MTU_EXPIRES, | |
2558 | .procname = "mtu_expires", | |
4990509f | 2559 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
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_MIN_ADVMSS, | |
2567 | .procname = "min_adv_mss", | |
4990509f | 2568 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
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_GC_MIN_INTERVAL_MS, | |
2576 | .procname = "gc_min_interval_ms", | |
4990509f | 2577 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2578 | .maxlen = sizeof(int), |
2579 | .mode = 0644, | |
1ab1457c | 2580 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2581 | .strategy = &sysctl_ms_jiffies, |
2582 | }, | |
2583 | { .ctl_name = 0 } | |
2584 | }; | |
2585 | ||
760f2d01 DL |
2586 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2587 | { | |
2588 | struct ctl_table *table; | |
2589 | ||
2590 | table = kmemdup(ipv6_route_table_template, | |
2591 | sizeof(ipv6_route_table_template), | |
2592 | GFP_KERNEL); | |
5ee09105 YH |
2593 | |
2594 | if (table) { | |
2595 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2596 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2597 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2598 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2599 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2600 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2601 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2602 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2603 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2604 | } | |
2605 | ||
760f2d01 DL |
2606 | return table; |
2607 | } | |
1da177e4 LT |
2608 | #endif |
2609 | ||
cdb18761 DL |
2610 | static int ip6_route_net_init(struct net *net) |
2611 | { | |
633d424b | 2612 | int ret = -ENOMEM; |
8ed67789 | 2613 | |
f2fc6a54 BT |
2614 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2615 | sizeof(*net->ipv6.ip6_dst_ops), | |
2616 | GFP_KERNEL); | |
2617 | if (!net->ipv6.ip6_dst_ops) | |
2618 | goto out; | |
48115bec | 2619 | net->ipv6.ip6_dst_ops->dst_net = hold_net(net); |
f2fc6a54 | 2620 | |
8ed67789 DL |
2621 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2622 | sizeof(*net->ipv6.ip6_null_entry), | |
2623 | GFP_KERNEL); | |
2624 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2625 | goto out_ip6_dst_ops; |
8ed67789 DL |
2626 | net->ipv6.ip6_null_entry->u.dst.path = |
2627 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2628 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2629 | |
2630 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2631 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2632 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2633 | GFP_KERNEL); | |
68fffc67 PZ |
2634 | if (!net->ipv6.ip6_prohibit_entry) |
2635 | goto out_ip6_null_entry; | |
8ed67789 DL |
2636 | net->ipv6.ip6_prohibit_entry->u.dst.path = |
2637 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2638 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2639 | |
2640 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2641 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2642 | GFP_KERNEL); | |
68fffc67 PZ |
2643 | if (!net->ipv6.ip6_blk_hole_entry) |
2644 | goto out_ip6_prohibit_entry; | |
8ed67789 DL |
2645 | net->ipv6.ip6_blk_hole_entry->u.dst.path = |
2646 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2647 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2648 | #endif |
2649 | ||
b339a47c PZ |
2650 | net->ipv6.sysctl.flush_delay = 0; |
2651 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2652 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2653 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2654 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2655 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2656 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2657 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2658 | ||
cdb18761 DL |
2659 | #ifdef CONFIG_PROC_FS |
2660 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2661 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2662 | #endif | |
6891a346 BT |
2663 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2664 | ||
8ed67789 DL |
2665 | ret = 0; |
2666 | out: | |
2667 | return ret; | |
f2fc6a54 | 2668 | |
68fffc67 PZ |
2669 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2670 | out_ip6_prohibit_entry: | |
2671 | kfree(net->ipv6.ip6_prohibit_entry); | |
2672 | out_ip6_null_entry: | |
2673 | kfree(net->ipv6.ip6_null_entry); | |
2674 | #endif | |
f2fc6a54 | 2675 | out_ip6_dst_ops: |
48115bec | 2676 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 BT |
2677 | kfree(net->ipv6.ip6_dst_ops); |
2678 | goto out; | |
cdb18761 DL |
2679 | } |
2680 | ||
2681 | static void ip6_route_net_exit(struct net *net) | |
2682 | { | |
2683 | #ifdef CONFIG_PROC_FS | |
2684 | proc_net_remove(net, "ipv6_route"); | |
2685 | proc_net_remove(net, "rt6_stats"); | |
2686 | #endif | |
8ed67789 DL |
2687 | kfree(net->ipv6.ip6_null_entry); |
2688 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2689 | kfree(net->ipv6.ip6_prohibit_entry); | |
2690 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2691 | #endif | |
48115bec | 2692 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 | 2693 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2694 | } |
2695 | ||
2696 | static struct pernet_operations ip6_route_net_ops = { | |
2697 | .init = ip6_route_net_init, | |
2698 | .exit = ip6_route_net_exit, | |
2699 | }; | |
2700 | ||
8ed67789 DL |
2701 | static struct notifier_block ip6_route_dev_notifier = { |
2702 | .notifier_call = ip6_route_dev_notify, | |
2703 | .priority = 0, | |
2704 | }; | |
2705 | ||
433d49c3 | 2706 | int __init ip6_route_init(void) |
1da177e4 | 2707 | { |
433d49c3 DL |
2708 | int ret; |
2709 | ||
9a7ec3a9 DL |
2710 | ret = -ENOMEM; |
2711 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2712 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2713 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2714 | if (!ip6_dst_ops_template.kmem_cachep) |
f2fc6a54 | 2715 | goto out;; |
14e50e57 | 2716 | |
8ed67789 DL |
2717 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2718 | if (ret) | |
bdb3289f | 2719 | goto out_kmem_cache; |
bdb3289f | 2720 | |
5dc121e9 AE |
2721 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2722 | ||
8ed67789 DL |
2723 | /* Registering of the loopback is done before this portion of code, |
2724 | * the loopback reference in rt6_info will not be taken, do it | |
2725 | * manually for init_net */ | |
2726 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2727 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2728 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2729 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2730 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2731 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2732 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2733 | #endif | |
433d49c3 DL |
2734 | ret = fib6_init(); |
2735 | if (ret) | |
8ed67789 | 2736 | goto out_register_subsys; |
433d49c3 | 2737 | |
433d49c3 DL |
2738 | ret = xfrm6_init(); |
2739 | if (ret) | |
cdb18761 | 2740 | goto out_fib6_init; |
c35b7e72 | 2741 | |
433d49c3 DL |
2742 | ret = fib6_rules_init(); |
2743 | if (ret) | |
2744 | goto xfrm6_init; | |
7e5449c2 | 2745 | |
433d49c3 DL |
2746 | ret = -ENOBUFS; |
2747 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2748 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2749 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2750 | goto fib6_rules_init; | |
c127ea2c | 2751 | |
8ed67789 | 2752 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2753 | if (ret) |
2754 | goto fib6_rules_init; | |
8ed67789 | 2755 | |
433d49c3 DL |
2756 | out: |
2757 | return ret; | |
2758 | ||
2759 | fib6_rules_init: | |
433d49c3 DL |
2760 | fib6_rules_cleanup(); |
2761 | xfrm6_init: | |
433d49c3 | 2762 | xfrm6_fini(); |
433d49c3 | 2763 | out_fib6_init: |
433d49c3 | 2764 | fib6_gc_cleanup(); |
8ed67789 DL |
2765 | out_register_subsys: |
2766 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2767 | out_kmem_cache: |
f2fc6a54 | 2768 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2769 | goto out; |
1da177e4 LT |
2770 | } |
2771 | ||
2772 | void ip6_route_cleanup(void) | |
2773 | { | |
8ed67789 | 2774 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2775 | fib6_rules_cleanup(); |
1da177e4 | 2776 | xfrm6_fini(); |
1da177e4 | 2777 | fib6_gc_cleanup(); |
8ed67789 | 2778 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2779 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2780 | } |