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 | 100 | .family = AF_INET6, |
09640e63 | 101 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
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, |
e2422970 | 111 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
112 | }; |
113 | ||
14e50e57 DM |
114 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
115 | { | |
116 | } | |
117 | ||
118 | static struct dst_ops ip6_dst_blackhole_ops = { | |
119 | .family = AF_INET6, | |
09640e63 | 120 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
121 | .destroy = ip6_dst_destroy, |
122 | .check = ip6_dst_check, | |
123 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
e2422970 | 124 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
125 | }; |
126 | ||
bdb3289f | 127 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
128 | .u = { |
129 | .dst = { | |
130 | .__refcnt = ATOMIC_INIT(1), | |
131 | .__use = 1, | |
1da177e4 LT |
132 | .obsolete = -1, |
133 | .error = -ENETUNREACH, | |
134 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
135 | .input = ip6_pkt_discard, | |
136 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
137 | } |
138 | }, | |
139 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 140 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
141 | .rt6i_metric = ~(u32) 0, |
142 | .rt6i_ref = ATOMIC_INIT(1), | |
143 | }; | |
144 | ||
101367c2 TG |
145 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
146 | ||
6723ab54 DM |
147 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
148 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 149 | |
280a34c8 | 150 | static struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
151 | .u = { |
152 | .dst = { | |
153 | .__refcnt = ATOMIC_INIT(1), | |
154 | .__use = 1, | |
101367c2 TG |
155 | .obsolete = -1, |
156 | .error = -EACCES, | |
157 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
158 | .input = ip6_pkt_prohibit, |
159 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
160 | } |
161 | }, | |
162 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 163 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
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), | |
4f724279 | 181 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
182 | .rt6i_metric = ~(u32) 0, |
183 | .rt6i_ref = ATOMIC_INIT(1), | |
184 | }; | |
185 | ||
186 | #endif | |
187 | ||
1da177e4 | 188 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 189 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 190 | { |
f2fc6a54 | 191 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
192 | } |
193 | ||
194 | static void ip6_dst_destroy(struct dst_entry *dst) | |
195 | { | |
196 | struct rt6_info *rt = (struct rt6_info *)dst; | |
197 | struct inet6_dev *idev = rt->rt6i_idev; | |
198 | ||
199 | if (idev != NULL) { | |
200 | rt->rt6i_idev = NULL; | |
201 | in6_dev_put(idev); | |
1ab1457c | 202 | } |
1da177e4 LT |
203 | } |
204 | ||
205 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
206 | int how) | |
207 | { | |
208 | struct rt6_info *rt = (struct rt6_info *)dst; | |
209 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 210 | struct net_device *loopback_dev = |
c346dca1 | 211 | dev_net(dev)->loopback_dev; |
1da177e4 | 212 | |
5a3e55d6 DL |
213 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
214 | struct inet6_dev *loopback_idev = | |
215 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
216 | if (loopback_idev != NULL) { |
217 | rt->rt6i_idev = loopback_idev; | |
218 | in6_dev_put(idev); | |
219 | } | |
220 | } | |
221 | } | |
222 | ||
223 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
224 | { | |
225 | return (rt->rt6i_flags & RTF_EXPIRES && | |
226 | time_after(jiffies, rt->rt6i_expires)); | |
227 | } | |
228 | ||
c71099ac TG |
229 | static inline int rt6_need_strict(struct in6_addr *daddr) |
230 | { | |
231 | return (ipv6_addr_type(daddr) & | |
5ce83afa | 232 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)); |
c71099ac TG |
233 | } |
234 | ||
1da177e4 | 235 | /* |
c71099ac | 236 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
237 | */ |
238 | ||
8ed67789 DL |
239 | static inline struct rt6_info *rt6_device_match(struct net *net, |
240 | struct rt6_info *rt, | |
dd3abc4e | 241 | struct in6_addr *saddr, |
1da177e4 | 242 | int oif, |
d420895e | 243 | int flags) |
1da177e4 LT |
244 | { |
245 | struct rt6_info *local = NULL; | |
246 | struct rt6_info *sprt; | |
247 | ||
dd3abc4e YH |
248 | if (!oif && ipv6_addr_any(saddr)) |
249 | goto out; | |
250 | ||
251 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { | |
252 | struct net_device *dev = sprt->rt6i_dev; | |
253 | ||
254 | if (oif) { | |
1da177e4 LT |
255 | if (dev->ifindex == oif) |
256 | return sprt; | |
257 | if (dev->flags & IFF_LOOPBACK) { | |
258 | if (sprt->rt6i_idev == NULL || | |
259 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 260 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 261 | continue; |
1ab1457c | 262 | if (local && (!oif || |
1da177e4 LT |
263 | local->rt6i_idev->dev->ifindex == oif)) |
264 | continue; | |
265 | } | |
266 | local = sprt; | |
267 | } | |
dd3abc4e YH |
268 | } else { |
269 | if (ipv6_chk_addr(net, saddr, dev, | |
270 | flags & RT6_LOOKUP_F_IFACE)) | |
271 | return sprt; | |
1da177e4 | 272 | } |
dd3abc4e | 273 | } |
1da177e4 | 274 | |
dd3abc4e | 275 | if (oif) { |
1da177e4 LT |
276 | if (local) |
277 | return local; | |
278 | ||
d420895e | 279 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 280 | return net->ipv6.ip6_null_entry; |
1da177e4 | 281 | } |
dd3abc4e | 282 | out: |
1da177e4 LT |
283 | return rt; |
284 | } | |
285 | ||
27097255 YH |
286 | #ifdef CONFIG_IPV6_ROUTER_PREF |
287 | static void rt6_probe(struct rt6_info *rt) | |
288 | { | |
289 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
290 | /* | |
291 | * Okay, this does not seem to be appropriate | |
292 | * for now, however, we need to check if it | |
293 | * is really so; aka Router Reachability Probing. | |
294 | * | |
295 | * Router Reachability Probe MUST be rate-limited | |
296 | * to no more than one per minute. | |
297 | */ | |
298 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
299 | return; | |
300 | read_lock_bh(&neigh->lock); | |
301 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 302 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
303 | struct in6_addr mcaddr; |
304 | struct in6_addr *target; | |
305 | ||
306 | neigh->updated = jiffies; | |
307 | read_unlock_bh(&neigh->lock); | |
308 | ||
309 | target = (struct in6_addr *)&neigh->primary_key; | |
310 | addrconf_addr_solict_mult(target, &mcaddr); | |
311 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
312 | } else | |
313 | read_unlock_bh(&neigh->lock); | |
314 | } | |
315 | #else | |
316 | static inline void rt6_probe(struct rt6_info *rt) | |
317 | { | |
318 | return; | |
319 | } | |
320 | #endif | |
321 | ||
1da177e4 | 322 | /* |
554cfb7e | 323 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 324 | */ |
b6f99a21 | 325 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
326 | { |
327 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 328 | if (!oif || dev->ifindex == oif) |
554cfb7e | 329 | return 2; |
161980f4 DM |
330 | if ((dev->flags & IFF_LOOPBACK) && |
331 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
332 | return 1; | |
333 | return 0; | |
554cfb7e | 334 | } |
1da177e4 | 335 | |
b6f99a21 | 336 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 337 | { |
554cfb7e | 338 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 339 | int m; |
4d0c5911 YH |
340 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
341 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
342 | m = 1; | |
343 | else if (neigh) { | |
554cfb7e YH |
344 | read_lock_bh(&neigh->lock); |
345 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 346 | m = 2; |
398bcbeb YH |
347 | #ifdef CONFIG_IPV6_ROUTER_PREF |
348 | else if (neigh->nud_state & NUD_FAILED) | |
349 | m = 0; | |
350 | #endif | |
351 | else | |
ea73ee23 | 352 | m = 1; |
554cfb7e | 353 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
354 | } else |
355 | m = 0; | |
554cfb7e | 356 | return m; |
1da177e4 LT |
357 | } |
358 | ||
554cfb7e YH |
359 | static int rt6_score_route(struct rt6_info *rt, int oif, |
360 | int strict) | |
1da177e4 | 361 | { |
4d0c5911 | 362 | int m, n; |
1ab1457c | 363 | |
4d0c5911 | 364 | m = rt6_check_dev(rt, oif); |
77d16f45 | 365 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 366 | return -1; |
ebacaaa0 YH |
367 | #ifdef CONFIG_IPV6_ROUTER_PREF |
368 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
369 | #endif | |
4d0c5911 | 370 | n = rt6_check_neigh(rt); |
557e92ef | 371 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
372 | return -1; |
373 | return m; | |
374 | } | |
375 | ||
f11e6659 DM |
376 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
377 | int *mpri, struct rt6_info *match) | |
554cfb7e | 378 | { |
f11e6659 DM |
379 | int m; |
380 | ||
381 | if (rt6_check_expired(rt)) | |
382 | goto out; | |
383 | ||
384 | m = rt6_score_route(rt, oif, strict); | |
385 | if (m < 0) | |
386 | goto out; | |
387 | ||
388 | if (m > *mpri) { | |
389 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
390 | rt6_probe(match); | |
391 | *mpri = m; | |
392 | match = rt; | |
393 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
394 | rt6_probe(rt); | |
395 | } | |
396 | ||
397 | out: | |
398 | return match; | |
399 | } | |
400 | ||
401 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
402 | struct rt6_info *rr_head, | |
403 | u32 metric, int oif, int strict) | |
404 | { | |
405 | struct rt6_info *rt, *match; | |
554cfb7e | 406 | int mpri = -1; |
1da177e4 | 407 | |
f11e6659 DM |
408 | match = NULL; |
409 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
410 | rt = rt->u.dst.rt6_next) | |
411 | match = find_match(rt, oif, strict, &mpri, match); | |
412 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
413 | rt = rt->u.dst.rt6_next) | |
414 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 415 | |
f11e6659 DM |
416 | return match; |
417 | } | |
1da177e4 | 418 | |
f11e6659 DM |
419 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
420 | { | |
421 | struct rt6_info *match, *rt0; | |
8ed67789 | 422 | struct net *net; |
1da177e4 | 423 | |
f11e6659 | 424 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 425 | __func__, fn->leaf, oif); |
554cfb7e | 426 | |
f11e6659 DM |
427 | rt0 = fn->rr_ptr; |
428 | if (!rt0) | |
429 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 430 | |
f11e6659 | 431 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 432 | |
554cfb7e | 433 | if (!match && |
f11e6659 DM |
434 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
435 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
436 | ||
554cfb7e | 437 | /* no entries matched; do round-robin */ |
f11e6659 DM |
438 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
439 | next = fn->leaf; | |
440 | ||
441 | if (next != rt0) | |
442 | fn->rr_ptr = next; | |
1da177e4 | 443 | } |
1da177e4 | 444 | |
f11e6659 | 445 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 446 | __func__, match); |
1da177e4 | 447 | |
c346dca1 | 448 | net = dev_net(rt0->rt6i_dev); |
8ed67789 | 449 | return (match ? match : net->ipv6.ip6_null_entry); |
1da177e4 LT |
450 | } |
451 | ||
70ceb4f5 YH |
452 | #ifdef CONFIG_IPV6_ROUTE_INFO |
453 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
454 | struct in6_addr *gwaddr) | |
455 | { | |
c346dca1 | 456 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
457 | struct route_info *rinfo = (struct route_info *) opt; |
458 | struct in6_addr prefix_buf, *prefix; | |
459 | unsigned int pref; | |
4bed72e4 | 460 | unsigned long lifetime; |
70ceb4f5 YH |
461 | struct rt6_info *rt; |
462 | ||
463 | if (len < sizeof(struct route_info)) { | |
464 | return -EINVAL; | |
465 | } | |
466 | ||
467 | /* Sanity check for prefix_len and length */ | |
468 | if (rinfo->length > 3) { | |
469 | return -EINVAL; | |
470 | } else if (rinfo->prefix_len > 128) { | |
471 | return -EINVAL; | |
472 | } else if (rinfo->prefix_len > 64) { | |
473 | if (rinfo->length < 2) { | |
474 | return -EINVAL; | |
475 | } | |
476 | } else if (rinfo->prefix_len > 0) { | |
477 | if (rinfo->length < 1) { | |
478 | return -EINVAL; | |
479 | } | |
480 | } | |
481 | ||
482 | pref = rinfo->route_pref; | |
483 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
484 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
485 | ||
4bed72e4 | 486 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
487 | |
488 | if (rinfo->length == 3) | |
489 | prefix = (struct in6_addr *)rinfo->prefix; | |
490 | else { | |
491 | /* this function is safe */ | |
492 | ipv6_addr_prefix(&prefix_buf, | |
493 | (struct in6_addr *)rinfo->prefix, | |
494 | rinfo->prefix_len); | |
495 | prefix = &prefix_buf; | |
496 | } | |
497 | ||
efa2cea0 DL |
498 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
499 | dev->ifindex); | |
70ceb4f5 YH |
500 | |
501 | if (rt && !lifetime) { | |
e0a1ad73 | 502 | ip6_del_rt(rt); |
70ceb4f5 YH |
503 | rt = NULL; |
504 | } | |
505 | ||
506 | if (!rt && lifetime) | |
efa2cea0 | 507 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
508 | pref); |
509 | else if (rt) | |
510 | rt->rt6i_flags = RTF_ROUTEINFO | | |
511 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
512 | ||
513 | if (rt) { | |
4bed72e4 | 514 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
515 | rt->rt6i_flags &= ~RTF_EXPIRES; |
516 | } else { | |
517 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
518 | rt->rt6i_flags |= RTF_EXPIRES; | |
519 | } | |
520 | dst_release(&rt->u.dst); | |
521 | } | |
522 | return 0; | |
523 | } | |
524 | #endif | |
525 | ||
8ed67789 | 526 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 527 | do { \ |
8ed67789 | 528 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 529 | struct fib6_node *pn; \ |
e0eda7bb | 530 | while (1) { \ |
982f56f3 YH |
531 | if (fn->fn_flags & RTN_TL_ROOT) \ |
532 | goto out; \ | |
533 | pn = fn->parent; \ | |
534 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 535 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
536 | else \ |
537 | fn = pn; \ | |
538 | if (fn->fn_flags & RTN_RTINFO) \ | |
539 | goto restart; \ | |
c71099ac | 540 | } \ |
c71099ac | 541 | } \ |
982f56f3 | 542 | } while(0) |
c71099ac | 543 | |
8ed67789 DL |
544 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
545 | struct fib6_table *table, | |
c71099ac | 546 | struct flowi *fl, int flags) |
1da177e4 LT |
547 | { |
548 | struct fib6_node *fn; | |
549 | struct rt6_info *rt; | |
550 | ||
c71099ac TG |
551 | read_lock_bh(&table->tb6_lock); |
552 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
553 | restart: | |
554 | rt = fn->leaf; | |
dd3abc4e | 555 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 556 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 557 | out: |
03f49f34 | 558 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 559 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
560 | return rt; |
561 | ||
562 | } | |
563 | ||
9acd9f3a YH |
564 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
565 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
566 | { |
567 | struct flowi fl = { | |
568 | .oif = oif, | |
569 | .nl_u = { | |
570 | .ip6_u = { | |
571 | .daddr = *daddr, | |
c71099ac TG |
572 | }, |
573 | }, | |
574 | }; | |
575 | struct dst_entry *dst; | |
77d16f45 | 576 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 577 | |
adaa70bb TG |
578 | if (saddr) { |
579 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
580 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
581 | } | |
582 | ||
606a2b48 | 583 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
584 | if (dst->error == 0) |
585 | return (struct rt6_info *) dst; | |
586 | ||
587 | dst_release(dst); | |
588 | ||
1da177e4 LT |
589 | return NULL; |
590 | } | |
591 | ||
7159039a YH |
592 | EXPORT_SYMBOL(rt6_lookup); |
593 | ||
c71099ac | 594 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
595 | It takes new route entry, the addition fails by any reason the |
596 | route is freed. In any case, if caller does not hold it, it may | |
597 | be destroyed. | |
598 | */ | |
599 | ||
86872cb5 | 600 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
601 | { |
602 | int err; | |
c71099ac | 603 | struct fib6_table *table; |
1da177e4 | 604 | |
c71099ac TG |
605 | table = rt->rt6i_table; |
606 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 607 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 608 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
609 | |
610 | return err; | |
611 | } | |
612 | ||
40e22e8f TG |
613 | int ip6_ins_rt(struct rt6_info *rt) |
614 | { | |
4d1169c1 | 615 | struct nl_info info = { |
c346dca1 | 616 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 617 | }; |
528c4ceb | 618 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
619 | } |
620 | ||
95a9a5ba YH |
621 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
622 | struct in6_addr *saddr) | |
1da177e4 | 623 | { |
1da177e4 LT |
624 | struct rt6_info *rt; |
625 | ||
626 | /* | |
627 | * Clone the route. | |
628 | */ | |
629 | ||
630 | rt = ip6_rt_copy(ort); | |
631 | ||
632 | if (rt) { | |
14deae41 DM |
633 | struct neighbour *neigh; |
634 | int attempts = !in_softirq(); | |
635 | ||
58c4fb86 YH |
636 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
637 | if (rt->rt6i_dst.plen != 128 && | |
638 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
639 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 640 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 641 | } |
1da177e4 | 642 | |
58c4fb86 | 643 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
644 | rt->rt6i_dst.plen = 128; |
645 | rt->rt6i_flags |= RTF_CACHE; | |
646 | rt->u.dst.flags |= DST_HOST; | |
647 | ||
648 | #ifdef CONFIG_IPV6_SUBTREES | |
649 | if (rt->rt6i_src.plen && saddr) { | |
650 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
651 | rt->rt6i_src.plen = 128; | |
652 | } | |
653 | #endif | |
654 | ||
14deae41 DM |
655 | retry: |
656 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
657 | if (IS_ERR(neigh)) { | |
658 | struct net *net = dev_net(rt->rt6i_dev); | |
659 | int saved_rt_min_interval = | |
660 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
661 | int saved_rt_elasticity = | |
662 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
663 | ||
664 | if (attempts-- > 0) { | |
665 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
666 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
667 | ||
668 | ip6_dst_gc(net->ipv6.ip6_dst_ops); | |
669 | ||
670 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
671 | saved_rt_elasticity; | |
672 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
673 | saved_rt_min_interval; | |
674 | goto retry; | |
675 | } | |
676 | ||
677 | if (net_ratelimit()) | |
678 | printk(KERN_WARNING | |
679 | "Neighbour table overflow.\n"); | |
680 | dst_free(&rt->u.dst); | |
681 | return NULL; | |
682 | } | |
683 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 684 | |
95a9a5ba | 685 | } |
1da177e4 | 686 | |
95a9a5ba YH |
687 | return rt; |
688 | } | |
1da177e4 | 689 | |
299d9939 YH |
690 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
691 | { | |
692 | struct rt6_info *rt = ip6_rt_copy(ort); | |
693 | if (rt) { | |
694 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
695 | rt->rt6i_dst.plen = 128; | |
696 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
697 | rt->u.dst.flags |= DST_HOST; |
698 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
699 | } | |
700 | return rt; | |
701 | } | |
702 | ||
8ed67789 DL |
703 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
704 | struct flowi *fl, int flags) | |
1da177e4 LT |
705 | { |
706 | struct fib6_node *fn; | |
519fbd87 | 707 | struct rt6_info *rt, *nrt; |
c71099ac | 708 | int strict = 0; |
1da177e4 | 709 | int attempts = 3; |
519fbd87 | 710 | int err; |
53b7997f | 711 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 712 | |
77d16f45 | 713 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
714 | |
715 | relookup: | |
c71099ac | 716 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 717 | |
8238dd06 | 718 | restart_2: |
c71099ac | 719 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
720 | |
721 | restart: | |
4acad72d | 722 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
723 | |
724 | BACKTRACK(net, &fl->fl6_src); | |
725 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 726 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 727 | goto out; |
1da177e4 | 728 | |
fb9de91e | 729 | dst_hold(&rt->u.dst); |
c71099ac | 730 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 731 | |
519fbd87 | 732 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 733 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
734 | else { |
735 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 736 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
737 | #else |
738 | goto out2; | |
739 | #endif | |
740 | } | |
e40cf353 | 741 | |
519fbd87 | 742 | dst_release(&rt->u.dst); |
8ed67789 | 743 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 744 | |
519fbd87 YH |
745 | dst_hold(&rt->u.dst); |
746 | if (nrt) { | |
40e22e8f | 747 | err = ip6_ins_rt(nrt); |
519fbd87 | 748 | if (!err) |
1da177e4 | 749 | goto out2; |
1da177e4 | 750 | } |
1da177e4 | 751 | |
519fbd87 YH |
752 | if (--attempts <= 0) |
753 | goto out2; | |
754 | ||
755 | /* | |
c71099ac | 756 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
757 | * released someone could insert this route. Relookup. |
758 | */ | |
759 | dst_release(&rt->u.dst); | |
760 | goto relookup; | |
761 | ||
762 | out: | |
8238dd06 YH |
763 | if (reachable) { |
764 | reachable = 0; | |
765 | goto restart_2; | |
766 | } | |
519fbd87 | 767 | dst_hold(&rt->u.dst); |
c71099ac | 768 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
769 | out2: |
770 | rt->u.dst.lastuse = jiffies; | |
771 | rt->u.dst.__use++; | |
c71099ac TG |
772 | |
773 | return rt; | |
1da177e4 LT |
774 | } |
775 | ||
8ed67789 | 776 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
777 | struct flowi *fl, int flags) |
778 | { | |
8ed67789 | 779 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
780 | } |
781 | ||
c71099ac TG |
782 | void ip6_route_input(struct sk_buff *skb) |
783 | { | |
0660e03f | 784 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 785 | struct net *net = dev_net(skb->dev); |
adaa70bb | 786 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
787 | struct flowi fl = { |
788 | .iif = skb->dev->ifindex, | |
789 | .nl_u = { | |
790 | .ip6_u = { | |
791 | .daddr = iph->daddr, | |
792 | .saddr = iph->saddr, | |
90bcaf7b | 793 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
794 | }, |
795 | }, | |
1ab1457c | 796 | .mark = skb->mark, |
c71099ac TG |
797 | .proto = iph->nexthdr, |
798 | }; | |
adaa70bb | 799 | |
1d6e55f1 | 800 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 801 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 802 | |
adf30907 | 803 | skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input)); |
c71099ac TG |
804 | } |
805 | ||
8ed67789 | 806 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 807 | struct flowi *fl, int flags) |
1da177e4 | 808 | { |
8ed67789 | 809 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
810 | } |
811 | ||
4591db4f DL |
812 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
813 | struct flowi *fl) | |
c71099ac TG |
814 | { |
815 | int flags = 0; | |
816 | ||
817 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 818 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 819 | |
adaa70bb TG |
820 | if (!ipv6_addr_any(&fl->fl6_src)) |
821 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
7cbca67c YH |
822 | else if (sk) { |
823 | unsigned int prefs = inet6_sk(sk)->srcprefs; | |
824 | if (prefs & IPV6_PREFER_SRC_TMP) | |
825 | flags |= RT6_LOOKUP_F_SRCPREF_TMP; | |
826 | if (prefs & IPV6_PREFER_SRC_PUBLIC) | |
827 | flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC; | |
828 | if (prefs & IPV6_PREFER_SRC_COA) | |
829 | flags |= RT6_LOOKUP_F_SRCPREF_COA; | |
830 | } | |
adaa70bb | 831 | |
4591db4f | 832 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
833 | } |
834 | ||
7159039a | 835 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 836 | |
14e50e57 DM |
837 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
838 | { | |
839 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
840 | struct rt6_info *rt = (struct rt6_info *) | |
841 | dst_alloc(&ip6_dst_blackhole_ops); | |
842 | struct dst_entry *new = NULL; | |
843 | ||
844 | if (rt) { | |
845 | new = &rt->u.dst; | |
846 | ||
847 | atomic_set(&new->__refcnt, 1); | |
848 | new->__use = 1; | |
352e512c HX |
849 | new->input = dst_discard; |
850 | new->output = dst_discard; | |
14e50e57 DM |
851 | |
852 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
853 | new->dev = ort->u.dst.dev; | |
854 | if (new->dev) | |
855 | dev_hold(new->dev); | |
856 | rt->rt6i_idev = ort->rt6i_idev; | |
857 | if (rt->rt6i_idev) | |
858 | in6_dev_hold(rt->rt6i_idev); | |
859 | rt->rt6i_expires = 0; | |
860 | ||
861 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
862 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
863 | rt->rt6i_metric = 0; | |
864 | ||
865 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
866 | #ifdef CONFIG_IPV6_SUBTREES | |
867 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
868 | #endif | |
869 | ||
870 | dst_free(new); | |
871 | } | |
872 | ||
873 | dst_release(*dstp); | |
874 | *dstp = new; | |
875 | return (new ? 0 : -ENOMEM); | |
876 | } | |
877 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
878 | ||
1da177e4 LT |
879 | /* |
880 | * Destination cache support functions | |
881 | */ | |
882 | ||
883 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
884 | { | |
885 | struct rt6_info *rt; | |
886 | ||
887 | rt = (struct rt6_info *) dst; | |
888 | ||
889 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
890 | return dst; | |
891 | ||
892 | return NULL; | |
893 | } | |
894 | ||
895 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
896 | { | |
897 | struct rt6_info *rt = (struct rt6_info *) dst; | |
898 | ||
899 | if (rt) { | |
900 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 901 | ip6_del_rt(rt); |
1da177e4 LT |
902 | else |
903 | dst_release(dst); | |
904 | } | |
905 | return NULL; | |
906 | } | |
907 | ||
908 | static void ip6_link_failure(struct sk_buff *skb) | |
909 | { | |
910 | struct rt6_info *rt; | |
911 | ||
912 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
913 | ||
adf30907 | 914 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
915 | if (rt) { |
916 | if (rt->rt6i_flags&RTF_CACHE) { | |
917 | dst_set_expires(&rt->u.dst, 0); | |
918 | rt->rt6i_flags |= RTF_EXPIRES; | |
919 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
920 | rt->rt6i_node->fn_sernum = -1; | |
921 | } | |
922 | } | |
923 | ||
924 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
925 | { | |
926 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
927 | ||
928 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
929 | rt6->rt6i_flags |= RTF_MODIFIED; | |
930 | if (mtu < IPV6_MIN_MTU) { | |
931 | mtu = IPV6_MIN_MTU; | |
932 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
933 | } | |
934 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 935 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
936 | } |
937 | } | |
938 | ||
1da177e4 LT |
939 | static int ipv6_get_mtu(struct net_device *dev); |
940 | ||
5578689a | 941 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
942 | { |
943 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
944 | ||
5578689a DL |
945 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
946 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
947 | |
948 | /* | |
1ab1457c YH |
949 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
950 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
951 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
952 | * rely only on pmtu discovery" |
953 | */ | |
954 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
955 | mtu = IPV6_MAXPLEN; | |
956 | return mtu; | |
957 | } | |
958 | ||
3b00944c YH |
959 | static struct dst_entry *icmp6_dst_gc_list; |
960 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 961 | |
3b00944c | 962 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 963 | struct neighbour *neigh, |
9acd9f3a | 964 | const struct in6_addr *addr) |
1da177e4 LT |
965 | { |
966 | struct rt6_info *rt; | |
967 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 968 | struct net *net = dev_net(dev); |
1da177e4 LT |
969 | |
970 | if (unlikely(idev == NULL)) | |
971 | return NULL; | |
972 | ||
f2fc6a54 | 973 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
974 | if (unlikely(rt == NULL)) { |
975 | in6_dev_put(idev); | |
976 | goto out; | |
977 | } | |
978 | ||
979 | dev_hold(dev); | |
980 | if (neigh) | |
981 | neigh_hold(neigh); | |
14deae41 | 982 | else { |
1da177e4 | 983 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
984 | if (IS_ERR(neigh)) |
985 | neigh = NULL; | |
986 | } | |
1da177e4 LT |
987 | |
988 | rt->rt6i_dev = dev; | |
989 | rt->rt6i_idev = idev; | |
990 | rt->rt6i_nexthop = neigh; | |
991 | atomic_set(&rt->u.dst.__refcnt, 1); | |
992 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
993 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 994 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 995 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
996 | |
997 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
998 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
999 | ? DST_HOST | |
1da177e4 LT |
1000 | : 0; |
1001 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1002 | rt->rt6i_dst.plen = 128; | |
1003 | #endif | |
1004 | ||
3b00944c YH |
1005 | spin_lock_bh(&icmp6_dst_lock); |
1006 | rt->u.dst.next = icmp6_dst_gc_list; | |
1007 | icmp6_dst_gc_list = &rt->u.dst; | |
1008 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 1009 | |
5578689a | 1010 | fib6_force_start_gc(net); |
1da177e4 LT |
1011 | |
1012 | out: | |
40aa7b90 | 1013 | return &rt->u.dst; |
1da177e4 LT |
1014 | } |
1015 | ||
3d0f24a7 | 1016 | int icmp6_dst_gc(void) |
1da177e4 LT |
1017 | { |
1018 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 1019 | int more = 0; |
1da177e4 LT |
1020 | |
1021 | next = NULL; | |
5d0bbeeb | 1022 | |
3b00944c YH |
1023 | spin_lock_bh(&icmp6_dst_lock); |
1024 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1025 | |
1da177e4 LT |
1026 | while ((dst = *pprev) != NULL) { |
1027 | if (!atomic_read(&dst->__refcnt)) { | |
1028 | *pprev = dst->next; | |
1029 | dst_free(dst); | |
1da177e4 LT |
1030 | } else { |
1031 | pprev = &dst->next; | |
3d0f24a7 | 1032 | ++more; |
1da177e4 LT |
1033 | } |
1034 | } | |
1035 | ||
3b00944c | 1036 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1037 | |
3d0f24a7 | 1038 | return more; |
1da177e4 LT |
1039 | } |
1040 | ||
1e493d19 DM |
1041 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1042 | void *arg) | |
1043 | { | |
1044 | struct dst_entry *dst, **pprev; | |
1045 | ||
1046 | spin_lock_bh(&icmp6_dst_lock); | |
1047 | pprev = &icmp6_dst_gc_list; | |
1048 | while ((dst = *pprev) != NULL) { | |
1049 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1050 | if (func(rt, arg)) { | |
1051 | *pprev = dst->next; | |
1052 | dst_free(dst); | |
1053 | } else { | |
1054 | pprev = &dst->next; | |
1055 | } | |
1056 | } | |
1057 | spin_unlock_bh(&icmp6_dst_lock); | |
1058 | } | |
1059 | ||
569d3645 | 1060 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1061 | { |
1da177e4 | 1062 | unsigned long now = jiffies; |
7019b78e DL |
1063 | struct net *net = ops->dst_net; |
1064 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
1065 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1066 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1067 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1068 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1069 | ||
1070 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1071 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1072 | goto out; |
1073 | ||
6891a346 BT |
1074 | net->ipv6.ip6_rt_gc_expire++; |
1075 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1076 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1077 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1078 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1079 | out: |
7019b78e DL |
1080 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1081 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1082 | } |
1083 | ||
1084 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1085 | but results in cleaner routing tables. | |
1086 | ||
1087 | Remove it only when all the things will work! | |
1088 | */ | |
1089 | ||
1090 | static int ipv6_get_mtu(struct net_device *dev) | |
1091 | { | |
1092 | int mtu = IPV6_MIN_MTU; | |
1093 | struct inet6_dev *idev; | |
1094 | ||
1095 | idev = in6_dev_get(dev); | |
1096 | if (idev) { | |
1097 | mtu = idev->cnf.mtu6; | |
1098 | in6_dev_put(idev); | |
1099 | } | |
1100 | return mtu; | |
1101 | } | |
1102 | ||
6b75d090 | 1103 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1104 | { |
6b75d090 YH |
1105 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1106 | if (hoplimit < 0) { | |
1107 | struct net_device *dev = dst->dev; | |
1108 | struct inet6_dev *idev = in6_dev_get(dev); | |
1109 | if (idev) { | |
1110 | hoplimit = idev->cnf.hop_limit; | |
1111 | in6_dev_put(idev); | |
1112 | } else | |
53b7997f | 1113 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
1da177e4 LT |
1114 | } |
1115 | return hoplimit; | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * | |
1120 | */ | |
1121 | ||
86872cb5 | 1122 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1123 | { |
1124 | int err; | |
5578689a | 1125 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1126 | struct rt6_info *rt = NULL; |
1127 | struct net_device *dev = NULL; | |
1128 | struct inet6_dev *idev = NULL; | |
c71099ac | 1129 | struct fib6_table *table; |
1da177e4 LT |
1130 | int addr_type; |
1131 | ||
86872cb5 | 1132 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1133 | return -EINVAL; |
1134 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1135 | if (cfg->fc_src_len) |
1da177e4 LT |
1136 | return -EINVAL; |
1137 | #endif | |
86872cb5 | 1138 | if (cfg->fc_ifindex) { |
1da177e4 | 1139 | err = -ENODEV; |
5578689a | 1140 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1141 | if (!dev) |
1142 | goto out; | |
1143 | idev = in6_dev_get(dev); | |
1144 | if (!idev) | |
1145 | goto out; | |
1146 | } | |
1147 | ||
86872cb5 TG |
1148 | if (cfg->fc_metric == 0) |
1149 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1150 | |
5578689a | 1151 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1152 | if (table == NULL) { |
1153 | err = -ENOBUFS; | |
1154 | goto out; | |
1155 | } | |
1156 | ||
f2fc6a54 | 1157 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1158 | |
1159 | if (rt == NULL) { | |
1160 | err = -ENOMEM; | |
1161 | goto out; | |
1162 | } | |
1163 | ||
1164 | rt->u.dst.obsolete = -1; | |
6f704992 YH |
1165 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1166 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1167 | 0; | |
1da177e4 | 1168 | |
86872cb5 TG |
1169 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1170 | cfg->fc_protocol = RTPROT_BOOT; | |
1171 | rt->rt6i_protocol = cfg->fc_protocol; | |
1172 | ||
1173 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1174 | |
1175 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1176 | rt->u.dst.input = ip6_mc_input; | |
1177 | else | |
1178 | rt->u.dst.input = ip6_forward; | |
1179 | ||
1180 | rt->u.dst.output = ip6_output; | |
1181 | ||
86872cb5 TG |
1182 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1183 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1184 | if (rt->rt6i_dst.plen == 128) |
1185 | rt->u.dst.flags = DST_HOST; | |
1186 | ||
1187 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1188 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1189 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1190 | #endif |
1191 | ||
86872cb5 | 1192 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1193 | |
1194 | /* We cannot add true routes via loopback here, | |
1195 | they would result in kernel looping; promote them to reject routes | |
1196 | */ | |
86872cb5 | 1197 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1198 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1199 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1200 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1201 | if (dev) { |
1202 | dev_put(dev); | |
1203 | in6_dev_put(idev); | |
1204 | } | |
5578689a | 1205 | dev = net->loopback_dev; |
1da177e4 LT |
1206 | dev_hold(dev); |
1207 | idev = in6_dev_get(dev); | |
1208 | if (!idev) { | |
1209 | err = -ENODEV; | |
1210 | goto out; | |
1211 | } | |
1212 | } | |
1213 | rt->u.dst.output = ip6_pkt_discard_out; | |
1214 | rt->u.dst.input = ip6_pkt_discard; | |
1215 | rt->u.dst.error = -ENETUNREACH; | |
1216 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1217 | goto install_route; | |
1218 | } | |
1219 | ||
86872cb5 | 1220 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1221 | struct in6_addr *gw_addr; |
1222 | int gwa_type; | |
1223 | ||
86872cb5 TG |
1224 | gw_addr = &cfg->fc_gateway; |
1225 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1226 | gwa_type = ipv6_addr_type(gw_addr); |
1227 | ||
1228 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1229 | struct rt6_info *grt; | |
1230 | ||
1231 | /* IPv6 strictly inhibits using not link-local | |
1232 | addresses as nexthop address. | |
1233 | Otherwise, router will not able to send redirects. | |
1234 | It is very good, but in some (rare!) circumstances | |
1235 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1236 | some exceptions. --ANK | |
1237 | */ | |
1238 | err = -EINVAL; | |
1239 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1240 | goto out; | |
1241 | ||
5578689a | 1242 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1243 | |
1244 | err = -EHOSTUNREACH; | |
1245 | if (grt == NULL) | |
1246 | goto out; | |
1247 | if (dev) { | |
1248 | if (dev != grt->rt6i_dev) { | |
1249 | dst_release(&grt->u.dst); | |
1250 | goto out; | |
1251 | } | |
1252 | } else { | |
1253 | dev = grt->rt6i_dev; | |
1254 | idev = grt->rt6i_idev; | |
1255 | dev_hold(dev); | |
1256 | in6_dev_hold(grt->rt6i_idev); | |
1257 | } | |
1258 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1259 | err = 0; | |
1260 | dst_release(&grt->u.dst); | |
1261 | ||
1262 | if (err) | |
1263 | goto out; | |
1264 | } | |
1265 | err = -EINVAL; | |
1266 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1267 | goto out; | |
1268 | } | |
1269 | ||
1270 | err = -ENODEV; | |
1271 | if (dev == NULL) | |
1272 | goto out; | |
1273 | ||
86872cb5 | 1274 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1275 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1276 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1277 | err = PTR_ERR(rt->rt6i_nexthop); | |
1278 | rt->rt6i_nexthop = NULL; | |
1279 | goto out; | |
1280 | } | |
1281 | } | |
1282 | ||
86872cb5 | 1283 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1284 | |
1285 | install_route: | |
86872cb5 TG |
1286 | if (cfg->fc_mx) { |
1287 | struct nlattr *nla; | |
1288 | int remaining; | |
1289 | ||
1290 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1291 | int type = nla_type(nla); |
86872cb5 TG |
1292 | |
1293 | if (type) { | |
1294 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1295 | err = -EINVAL; |
1296 | goto out; | |
1297 | } | |
86872cb5 TG |
1298 | |
1299 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1300 | } |
1da177e4 LT |
1301 | } |
1302 | } | |
1303 | ||
5ffc02a1 | 1304 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1305 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1ca615fb | 1306 | if (!dst_mtu(&rt->u.dst)) |
1da177e4 | 1307 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
5ffc02a1 | 1308 | if (!dst_metric(&rt->u.dst, RTAX_ADVMSS)) |
5578689a | 1309 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1310 | rt->u.dst.dev = dev; |
1311 | rt->rt6i_idev = idev; | |
c71099ac | 1312 | rt->rt6i_table = table; |
63152fc0 | 1313 | |
c346dca1 | 1314 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1315 | |
86872cb5 | 1316 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1317 | |
1318 | out: | |
1319 | if (dev) | |
1320 | dev_put(dev); | |
1321 | if (idev) | |
1322 | in6_dev_put(idev); | |
1323 | if (rt) | |
40aa7b90 | 1324 | dst_free(&rt->u.dst); |
1da177e4 LT |
1325 | return err; |
1326 | } | |
1327 | ||
86872cb5 | 1328 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1329 | { |
1330 | int err; | |
c71099ac | 1331 | struct fib6_table *table; |
c346dca1 | 1332 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1333 | |
8ed67789 | 1334 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1335 | return -ENOENT; |
1336 | ||
c71099ac TG |
1337 | table = rt->rt6i_table; |
1338 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1339 | |
86872cb5 | 1340 | err = fib6_del(rt, info); |
1da177e4 LT |
1341 | dst_release(&rt->u.dst); |
1342 | ||
c71099ac | 1343 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1344 | |
1345 | return err; | |
1346 | } | |
1347 | ||
e0a1ad73 TG |
1348 | int ip6_del_rt(struct rt6_info *rt) |
1349 | { | |
4d1169c1 | 1350 | struct nl_info info = { |
c346dca1 | 1351 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1352 | }; |
528c4ceb | 1353 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1354 | } |
1355 | ||
86872cb5 | 1356 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1357 | { |
c71099ac | 1358 | struct fib6_table *table; |
1da177e4 LT |
1359 | struct fib6_node *fn; |
1360 | struct rt6_info *rt; | |
1361 | int err = -ESRCH; | |
1362 | ||
5578689a | 1363 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1364 | if (table == NULL) |
1365 | return err; | |
1366 | ||
1367 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1368 | |
c71099ac | 1369 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1370 | &cfg->fc_dst, cfg->fc_dst_len, |
1371 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1372 | |
1da177e4 | 1373 | if (fn) { |
7cc48263 | 1374 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1375 | if (cfg->fc_ifindex && |
1da177e4 | 1376 | (rt->rt6i_dev == NULL || |
86872cb5 | 1377 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1378 | continue; |
86872cb5 TG |
1379 | if (cfg->fc_flags & RTF_GATEWAY && |
1380 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1381 | continue; |
86872cb5 | 1382 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1383 | continue; |
1384 | dst_hold(&rt->u.dst); | |
c71099ac | 1385 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1386 | |
86872cb5 | 1387 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1388 | } |
1389 | } | |
c71099ac | 1390 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1391 | |
1392 | return err; | |
1393 | } | |
1394 | ||
1395 | /* | |
1396 | * Handle redirects | |
1397 | */ | |
a6279458 YH |
1398 | struct ip6rd_flowi { |
1399 | struct flowi fl; | |
1400 | struct in6_addr gateway; | |
1401 | }; | |
1402 | ||
8ed67789 DL |
1403 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1404 | struct fib6_table *table, | |
a6279458 YH |
1405 | struct flowi *fl, |
1406 | int flags) | |
1da177e4 | 1407 | { |
a6279458 YH |
1408 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1409 | struct rt6_info *rt; | |
e843b9e1 | 1410 | struct fib6_node *fn; |
c71099ac | 1411 | |
1da177e4 | 1412 | /* |
e843b9e1 YH |
1413 | * Get the "current" route for this destination and |
1414 | * check if the redirect has come from approriate router. | |
1415 | * | |
1416 | * RFC 2461 specifies that redirects should only be | |
1417 | * accepted if they come from the nexthop to the target. | |
1418 | * Due to the way the routes are chosen, this notion | |
1419 | * is a bit fuzzy and one might need to check all possible | |
1420 | * routes. | |
1da177e4 | 1421 | */ |
1da177e4 | 1422 | |
c71099ac | 1423 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1424 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1425 | restart: |
7cc48263 | 1426 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1427 | /* |
1428 | * Current route is on-link; redirect is always invalid. | |
1429 | * | |
1430 | * Seems, previous statement is not true. It could | |
1431 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1432 | * But then router serving it might decide, that we should | |
1433 | * know truth 8)8) --ANK (980726). | |
1434 | */ | |
1435 | if (rt6_check_expired(rt)) | |
1436 | continue; | |
1437 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1438 | continue; | |
a6279458 | 1439 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1440 | continue; |
a6279458 | 1441 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1442 | continue; |
1443 | break; | |
1444 | } | |
a6279458 | 1445 | |
cb15d9c2 | 1446 | if (!rt) |
8ed67789 DL |
1447 | rt = net->ipv6.ip6_null_entry; |
1448 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1449 | out: |
a6279458 YH |
1450 | dst_hold(&rt->u.dst); |
1451 | ||
c71099ac | 1452 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1453 | |
a6279458 YH |
1454 | return rt; |
1455 | }; | |
1456 | ||
1457 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1458 | struct in6_addr *src, | |
1459 | struct in6_addr *gateway, | |
1460 | struct net_device *dev) | |
1461 | { | |
adaa70bb | 1462 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1463 | struct net *net = dev_net(dev); |
a6279458 YH |
1464 | struct ip6rd_flowi rdfl = { |
1465 | .fl = { | |
1466 | .oif = dev->ifindex, | |
1467 | .nl_u = { | |
1468 | .ip6_u = { | |
1469 | .daddr = *dest, | |
1470 | .saddr = *src, | |
1471 | }, | |
1472 | }, | |
1473 | }, | |
1474 | .gateway = *gateway, | |
1475 | }; | |
adaa70bb TG |
1476 | |
1477 | if (rt6_need_strict(dest)) | |
1478 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1479 | |
5578689a | 1480 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1481 | flags, __ip6_route_redirect); |
a6279458 YH |
1482 | } |
1483 | ||
1484 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1485 | struct in6_addr *saddr, | |
1486 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1487 | { | |
1488 | struct rt6_info *rt, *nrt = NULL; | |
1489 | struct netevent_redirect netevent; | |
c346dca1 | 1490 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1491 | |
1492 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1493 | ||
8ed67789 | 1494 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1495 | if (net_ratelimit()) |
1496 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1497 | "for redirect target\n"); | |
a6279458 | 1498 | goto out; |
1da177e4 LT |
1499 | } |
1500 | ||
1da177e4 LT |
1501 | /* |
1502 | * We have finally decided to accept it. | |
1503 | */ | |
1504 | ||
1ab1457c | 1505 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1506 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1507 | NEIGH_UPDATE_F_OVERRIDE| | |
1508 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1509 | NEIGH_UPDATE_F_ISROUTER)) | |
1510 | ); | |
1511 | ||
1512 | /* | |
1513 | * Redirect received -> path was valid. | |
1514 | * Look, redirects are sent only in response to data packets, | |
1515 | * so that this nexthop apparently is reachable. --ANK | |
1516 | */ | |
1517 | dst_confirm(&rt->u.dst); | |
1518 | ||
1519 | /* Duplicate redirect: silently ignore. */ | |
1520 | if (neigh == rt->u.dst.neighbour) | |
1521 | goto out; | |
1522 | ||
1523 | nrt = ip6_rt_copy(rt); | |
1524 | if (nrt == NULL) | |
1525 | goto out; | |
1526 | ||
1527 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1528 | if (on_link) | |
1529 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1530 | ||
1531 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1532 | nrt->rt6i_dst.plen = 128; | |
1533 | nrt->u.dst.flags |= DST_HOST; | |
1534 | ||
1535 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1536 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1537 | /* Reset pmtu, it may be better */ | |
1538 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
c346dca1 | 1539 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), |
5578689a | 1540 | dst_mtu(&nrt->u.dst)); |
1da177e4 | 1541 | |
40e22e8f | 1542 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1543 | goto out; |
1544 | ||
8d71740c TT |
1545 | netevent.old = &rt->u.dst; |
1546 | netevent.new = &nrt->u.dst; | |
1547 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1548 | ||
1da177e4 | 1549 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1550 | ip6_del_rt(rt); |
1da177e4 LT |
1551 | return; |
1552 | } | |
1553 | ||
1554 | out: | |
1ab1457c | 1555 | dst_release(&rt->u.dst); |
1da177e4 LT |
1556 | return; |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * Handle ICMP "packet too big" messages | |
1561 | * i.e. Path MTU discovery | |
1562 | */ | |
1563 | ||
1564 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1565 | struct net_device *dev, u32 pmtu) | |
1566 | { | |
1567 | struct rt6_info *rt, *nrt; | |
c346dca1 | 1568 | struct net *net = dev_net(dev); |
1da177e4 LT |
1569 | int allfrag = 0; |
1570 | ||
5578689a | 1571 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1572 | if (rt == NULL) |
1573 | return; | |
1574 | ||
1575 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1576 | goto out; | |
1577 | ||
1578 | if (pmtu < IPV6_MIN_MTU) { | |
1579 | /* | |
1ab1457c | 1580 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1581 | * MTU (1280) and a fragment header should always be included |
1582 | * after a node receiving Too Big message reporting PMTU is | |
1583 | * less than the IPv6 Minimum Link MTU. | |
1584 | */ | |
1585 | pmtu = IPV6_MIN_MTU; | |
1586 | allfrag = 1; | |
1587 | } | |
1588 | ||
1589 | /* New mtu received -> path was valid. | |
1590 | They are sent only in response to data packets, | |
1591 | so that this nexthop apparently is reachable. --ANK | |
1592 | */ | |
1593 | dst_confirm(&rt->u.dst); | |
1594 | ||
1595 | /* Host route. If it is static, it would be better | |
1596 | not to override it, but add new one, so that | |
1597 | when cache entry will expire old pmtu | |
1598 | would return automatically. | |
1599 | */ | |
1600 | if (rt->rt6i_flags & RTF_CACHE) { | |
1601 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1602 | if (allfrag) | |
1603 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1604 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1605 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1606 | goto out; | |
1607 | } | |
1608 | ||
1609 | /* Network route. | |
1610 | Two cases are possible: | |
1611 | 1. It is connected route. Action: COW | |
1612 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1613 | */ | |
d5315b50 | 1614 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1615 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1616 | else |
1617 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1618 | |
d5315b50 | 1619 | if (nrt) { |
a1e78363 YH |
1620 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1621 | if (allfrag) | |
1622 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1623 | ||
1624 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1625 | * happened within 5 mins, the recommended timer is 10 mins. | |
1626 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1627 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1628 | * and detecting PMTU increase will be automatically happened. | |
1629 | */ | |
5578689a | 1630 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1631 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1632 | ||
40e22e8f | 1633 | ip6_ins_rt(nrt); |
1da177e4 | 1634 | } |
1da177e4 LT |
1635 | out: |
1636 | dst_release(&rt->u.dst); | |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * Misc support functions | |
1641 | */ | |
1642 | ||
1643 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1644 | { | |
c346dca1 | 1645 | struct net *net = dev_net(ort->rt6i_dev); |
f2fc6a54 | 1646 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1647 | |
1648 | if (rt) { | |
1649 | rt->u.dst.input = ort->u.dst.input; | |
1650 | rt->u.dst.output = ort->u.dst.output; | |
1651 | ||
1652 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1653 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1654 | rt->u.dst.dev = ort->u.dst.dev; |
1655 | if (rt->u.dst.dev) | |
1656 | dev_hold(rt->u.dst.dev); | |
1657 | rt->rt6i_idev = ort->rt6i_idev; | |
1658 | if (rt->rt6i_idev) | |
1659 | in6_dev_hold(rt->rt6i_idev); | |
1660 | rt->u.dst.lastuse = jiffies; | |
1661 | rt->rt6i_expires = 0; | |
1662 | ||
1663 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1664 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1665 | rt->rt6i_metric = 0; | |
1666 | ||
1667 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1668 | #ifdef CONFIG_IPV6_SUBTREES | |
1669 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1670 | #endif | |
c71099ac | 1671 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1672 | } |
1673 | return rt; | |
1674 | } | |
1675 | ||
70ceb4f5 | 1676 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1677 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1678 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1679 | struct in6_addr *gwaddr, int ifindex) |
1680 | { | |
1681 | struct fib6_node *fn; | |
1682 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1683 | struct fib6_table *table; |
1684 | ||
efa2cea0 | 1685 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1686 | if (table == NULL) |
1687 | return NULL; | |
70ceb4f5 | 1688 | |
c71099ac TG |
1689 | write_lock_bh(&table->tb6_lock); |
1690 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1691 | if (!fn) |
1692 | goto out; | |
1693 | ||
7cc48263 | 1694 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1695 | if (rt->rt6i_dev->ifindex != ifindex) |
1696 | continue; | |
1697 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1698 | continue; | |
1699 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1700 | continue; | |
1701 | dst_hold(&rt->u.dst); | |
1702 | break; | |
1703 | } | |
1704 | out: | |
c71099ac | 1705 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1706 | return rt; |
1707 | } | |
1708 | ||
efa2cea0 DL |
1709 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1710 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1711 | struct in6_addr *gwaddr, int ifindex, |
1712 | unsigned pref) | |
1713 | { | |
86872cb5 TG |
1714 | struct fib6_config cfg = { |
1715 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1716 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1717 | .fc_ifindex = ifindex, |
1718 | .fc_dst_len = prefixlen, | |
1719 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1720 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1721 | .fc_nlinfo.pid = 0, |
1722 | .fc_nlinfo.nlh = NULL, | |
1723 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1724 | }; |
1725 | ||
1726 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1727 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1728 | |
e317da96 YH |
1729 | /* We should treat it as a default route if prefix length is 0. */ |
1730 | if (!prefixlen) | |
86872cb5 | 1731 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1732 | |
86872cb5 | 1733 | ip6_route_add(&cfg); |
70ceb4f5 | 1734 | |
efa2cea0 | 1735 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1736 | } |
1737 | #endif | |
1738 | ||
1da177e4 | 1739 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1740 | { |
1da177e4 | 1741 | struct rt6_info *rt; |
c71099ac | 1742 | struct fib6_table *table; |
1da177e4 | 1743 | |
c346dca1 | 1744 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1745 | if (table == NULL) |
1746 | return NULL; | |
1da177e4 | 1747 | |
c71099ac | 1748 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1749 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1750 | if (dev == rt->rt6i_dev && |
045927ff | 1751 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1752 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1753 | break; | |
1754 | } | |
1755 | if (rt) | |
1756 | dst_hold(&rt->u.dst); | |
c71099ac | 1757 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1758 | return rt; |
1759 | } | |
1760 | ||
1761 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1762 | struct net_device *dev, |
1763 | unsigned int pref) | |
1da177e4 | 1764 | { |
86872cb5 TG |
1765 | struct fib6_config cfg = { |
1766 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1767 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1768 | .fc_ifindex = dev->ifindex, |
1769 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1770 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1771 | .fc_nlinfo.pid = 0, |
1772 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1773 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1774 | }; |
1da177e4 | 1775 | |
86872cb5 | 1776 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1777 | |
86872cb5 | 1778 | ip6_route_add(&cfg); |
1da177e4 | 1779 | |
1da177e4 LT |
1780 | return rt6_get_dflt_router(gwaddr, dev); |
1781 | } | |
1782 | ||
7b4da532 | 1783 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1784 | { |
1785 | struct rt6_info *rt; | |
c71099ac TG |
1786 | struct fib6_table *table; |
1787 | ||
1788 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1789 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1790 | if (table == NULL) |
1791 | return; | |
1da177e4 LT |
1792 | |
1793 | restart: | |
c71099ac | 1794 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1795 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1796 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1797 | dst_hold(&rt->u.dst); | |
c71099ac | 1798 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1799 | ip6_del_rt(rt); |
1da177e4 LT |
1800 | goto restart; |
1801 | } | |
1802 | } | |
c71099ac | 1803 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1804 | } |
1805 | ||
5578689a DL |
1806 | static void rtmsg_to_fib6_config(struct net *net, |
1807 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1808 | struct fib6_config *cfg) |
1809 | { | |
1810 | memset(cfg, 0, sizeof(*cfg)); | |
1811 | ||
1812 | cfg->fc_table = RT6_TABLE_MAIN; | |
1813 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1814 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1815 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1816 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1817 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1818 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1819 | ||
5578689a | 1820 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1821 | |
86872cb5 TG |
1822 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1823 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1824 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1825 | } | |
1826 | ||
5578689a | 1827 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1828 | { |
86872cb5 | 1829 | struct fib6_config cfg; |
1da177e4 LT |
1830 | struct in6_rtmsg rtmsg; |
1831 | int err; | |
1832 | ||
1833 | switch(cmd) { | |
1834 | case SIOCADDRT: /* Add a route */ | |
1835 | case SIOCDELRT: /* Delete a route */ | |
1836 | if (!capable(CAP_NET_ADMIN)) | |
1837 | return -EPERM; | |
1838 | err = copy_from_user(&rtmsg, arg, | |
1839 | sizeof(struct in6_rtmsg)); | |
1840 | if (err) | |
1841 | return -EFAULT; | |
86872cb5 | 1842 | |
5578689a | 1843 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1844 | |
1da177e4 LT |
1845 | rtnl_lock(); |
1846 | switch (cmd) { | |
1847 | case SIOCADDRT: | |
86872cb5 | 1848 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1849 | break; |
1850 | case SIOCDELRT: | |
86872cb5 | 1851 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1852 | break; |
1853 | default: | |
1854 | err = -EINVAL; | |
1855 | } | |
1856 | rtnl_unlock(); | |
1857 | ||
1858 | return err; | |
3ff50b79 | 1859 | } |
1da177e4 LT |
1860 | |
1861 | return -EINVAL; | |
1862 | } | |
1863 | ||
1864 | /* | |
1865 | * Drop the packet on the floor | |
1866 | */ | |
1867 | ||
d5fdd6ba | 1868 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1869 | { |
612f09e8 | 1870 | int type; |
adf30907 | 1871 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1872 | switch (ipstats_mib_noroutes) { |
1873 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1874 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 | 1875 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
3bd653c8 DL |
1876 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1877 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1878 | break; |
1879 | } | |
1880 | /* FALLTHROUGH */ | |
1881 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1882 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1883 | ipstats_mib_noroutes); | |
612f09e8 YH |
1884 | break; |
1885 | } | |
9ce8ade0 | 1886 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1887 | kfree_skb(skb); |
1888 | return 0; | |
1889 | } | |
1890 | ||
9ce8ade0 TG |
1891 | static int ip6_pkt_discard(struct sk_buff *skb) |
1892 | { | |
612f09e8 | 1893 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1894 | } |
1895 | ||
20380731 | 1896 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 1897 | { |
adf30907 | 1898 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1899 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1900 | } |
1901 | ||
6723ab54 DM |
1902 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1903 | ||
9ce8ade0 TG |
1904 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1905 | { | |
612f09e8 | 1906 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1907 | } |
1908 | ||
1909 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1910 | { | |
adf30907 | 1911 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1912 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1913 | } |
1914 | ||
6723ab54 DM |
1915 | #endif |
1916 | ||
1da177e4 LT |
1917 | /* |
1918 | * Allocate a dst for local (unicast / anycast) address. | |
1919 | */ | |
1920 | ||
1921 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1922 | const struct in6_addr *addr, | |
1923 | int anycast) | |
1924 | { | |
c346dca1 | 1925 | struct net *net = dev_net(idev->dev); |
f2fc6a54 | 1926 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
14deae41 | 1927 | struct neighbour *neigh; |
1da177e4 LT |
1928 | |
1929 | if (rt == NULL) | |
1930 | return ERR_PTR(-ENOMEM); | |
1931 | ||
5578689a | 1932 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1933 | in6_dev_hold(idev); |
1934 | ||
1935 | rt->u.dst.flags = DST_HOST; | |
1936 | rt->u.dst.input = ip6_input; | |
1937 | rt->u.dst.output = ip6_output; | |
5578689a | 1938 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1939 | rt->rt6i_idev = idev; |
1940 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1941 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1942 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1943 | rt->u.dst.obsolete = -1; | |
1944 | ||
1945 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1946 | if (anycast) |
1947 | rt->rt6i_flags |= RTF_ANYCAST; | |
1948 | else | |
1da177e4 | 1949 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
1950 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
1951 | if (IS_ERR(neigh)) { | |
40aa7b90 | 1952 | dst_free(&rt->u.dst); |
14deae41 DM |
1953 | |
1954 | /* We are casting this because that is the return | |
1955 | * value type. But an errno encoded pointer is the | |
1956 | * same regardless of the underlying pointer type, | |
1957 | * and that's what we are returning. So this is OK. | |
1958 | */ | |
1959 | return (struct rt6_info *) neigh; | |
1da177e4 | 1960 | } |
14deae41 | 1961 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
1962 | |
1963 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1964 | rt->rt6i_dst.plen = 128; | |
5578689a | 1965 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1966 | |
1967 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1968 | ||
1969 | return rt; | |
1970 | } | |
1971 | ||
8ed67789 DL |
1972 | struct arg_dev_net { |
1973 | struct net_device *dev; | |
1974 | struct net *net; | |
1975 | }; | |
1976 | ||
1da177e4 LT |
1977 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1978 | { | |
8ed67789 DL |
1979 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1980 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1981 | ||
1982 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1983 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1984 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1985 | return -1; | |
1986 | } | |
1987 | return 0; | |
1988 | } | |
1989 | ||
f3db4851 | 1990 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1991 | { |
8ed67789 DL |
1992 | struct arg_dev_net adn = { |
1993 | .dev = dev, | |
1994 | .net = net, | |
1995 | }; | |
1996 | ||
1997 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 1998 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
1999 | } |
2000 | ||
2001 | struct rt6_mtu_change_arg | |
2002 | { | |
2003 | struct net_device *dev; | |
2004 | unsigned mtu; | |
2005 | }; | |
2006 | ||
2007 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2008 | { | |
2009 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2010 | struct inet6_dev *idev; | |
c346dca1 | 2011 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
2012 | |
2013 | /* In IPv6 pmtu discovery is not optional, | |
2014 | so that RTAX_MTU lock cannot disable it. | |
2015 | We still use this lock to block changes | |
2016 | caused by addrconf/ndisc. | |
2017 | */ | |
2018 | ||
2019 | idev = __in6_dev_get(arg->dev); | |
2020 | if (idev == NULL) | |
2021 | return 0; | |
2022 | ||
2023 | /* For administrative MTU increase, there is no way to discover | |
2024 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2025 | Since RFC 1981 doesn't include administrative MTU increase | |
2026 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2027 | */ | |
2028 | /* | |
2029 | If new MTU is less than route PMTU, this new MTU will be the | |
2030 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2031 | decreases; if new MTU is greater than route PMTU, and the | |
2032 | old MTU is the lowest MTU in the path, update the route PMTU | |
2033 | to reflect the increase. In this case if the other nodes' MTU | |
2034 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2035 | PMTU discouvery. | |
2036 | */ | |
2037 | if (rt->rt6i_dev == arg->dev && | |
2038 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 2039 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 2040 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 2041 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 2042 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 2043 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 2044 | } |
1da177e4 LT |
2045 | return 0; |
2046 | } | |
2047 | ||
2048 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2049 | { | |
c71099ac TG |
2050 | struct rt6_mtu_change_arg arg = { |
2051 | .dev = dev, | |
2052 | .mtu = mtu, | |
2053 | }; | |
1da177e4 | 2054 | |
c346dca1 | 2055 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2056 | } |
2057 | ||
ef7c79ed | 2058 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2059 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2060 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2061 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2062 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2063 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2064 | }; | |
2065 | ||
2066 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2067 | struct fib6_config *cfg) | |
1da177e4 | 2068 | { |
86872cb5 TG |
2069 | struct rtmsg *rtm; |
2070 | struct nlattr *tb[RTA_MAX+1]; | |
2071 | int err; | |
1da177e4 | 2072 | |
86872cb5 TG |
2073 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2074 | if (err < 0) | |
2075 | goto errout; | |
1da177e4 | 2076 | |
86872cb5 TG |
2077 | err = -EINVAL; |
2078 | rtm = nlmsg_data(nlh); | |
2079 | memset(cfg, 0, sizeof(*cfg)); | |
2080 | ||
2081 | cfg->fc_table = rtm->rtm_table; | |
2082 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2083 | cfg->fc_src_len = rtm->rtm_src_len; | |
2084 | cfg->fc_flags = RTF_UP; | |
2085 | cfg->fc_protocol = rtm->rtm_protocol; | |
2086 | ||
2087 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2088 | cfg->fc_flags |= RTF_REJECT; | |
2089 | ||
2090 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2091 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2092 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2093 | |
2094 | if (tb[RTA_GATEWAY]) { | |
2095 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2096 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2097 | } |
86872cb5 TG |
2098 | |
2099 | if (tb[RTA_DST]) { | |
2100 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2101 | ||
2102 | if (nla_len(tb[RTA_DST]) < plen) | |
2103 | goto errout; | |
2104 | ||
2105 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2106 | } |
86872cb5 TG |
2107 | |
2108 | if (tb[RTA_SRC]) { | |
2109 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2110 | ||
2111 | if (nla_len(tb[RTA_SRC]) < plen) | |
2112 | goto errout; | |
2113 | ||
2114 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2115 | } |
86872cb5 TG |
2116 | |
2117 | if (tb[RTA_OIF]) | |
2118 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2119 | ||
2120 | if (tb[RTA_PRIORITY]) | |
2121 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2122 | ||
2123 | if (tb[RTA_METRICS]) { | |
2124 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2125 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2126 | } |
86872cb5 TG |
2127 | |
2128 | if (tb[RTA_TABLE]) | |
2129 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2130 | ||
2131 | err = 0; | |
2132 | errout: | |
2133 | return err; | |
1da177e4 LT |
2134 | } |
2135 | ||
c127ea2c | 2136 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2137 | { |
86872cb5 TG |
2138 | struct fib6_config cfg; |
2139 | int err; | |
1da177e4 | 2140 | |
86872cb5 TG |
2141 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2142 | if (err < 0) | |
2143 | return err; | |
2144 | ||
2145 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2146 | } |
2147 | ||
c127ea2c | 2148 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2149 | { |
86872cb5 TG |
2150 | struct fib6_config cfg; |
2151 | int err; | |
1da177e4 | 2152 | |
86872cb5 TG |
2153 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2154 | if (err < 0) | |
2155 | return err; | |
2156 | ||
2157 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2158 | } |
2159 | ||
339bf98f TG |
2160 | static inline size_t rt6_nlmsg_size(void) |
2161 | { | |
2162 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2163 | + nla_total_size(16) /* RTA_SRC */ | |
2164 | + nla_total_size(16) /* RTA_DST */ | |
2165 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2166 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2167 | + nla_total_size(4) /* RTA_TABLE */ | |
2168 | + nla_total_size(4) /* RTA_IIF */ | |
2169 | + nla_total_size(4) /* RTA_OIF */ | |
2170 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2171 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2172 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2173 | } | |
2174 | ||
191cd582 BH |
2175 | static int rt6_fill_node(struct net *net, |
2176 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2177 | struct in6_addr *dst, struct in6_addr *src, |
2178 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2179 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2180 | { |
2181 | struct rtmsg *rtm; | |
2d7202bf | 2182 | struct nlmsghdr *nlh; |
e3703b3d | 2183 | long expires; |
9e762a4a | 2184 | u32 table; |
1da177e4 LT |
2185 | |
2186 | if (prefix) { /* user wants prefix routes only */ | |
2187 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2188 | /* success since this is not a prefix route */ | |
2189 | return 1; | |
2190 | } | |
2191 | } | |
2192 | ||
2d7202bf TG |
2193 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2194 | if (nlh == NULL) | |
26932566 | 2195 | return -EMSGSIZE; |
2d7202bf TG |
2196 | |
2197 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2198 | rtm->rtm_family = AF_INET6; |
2199 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2200 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2201 | rtm->rtm_tos = 0; | |
c71099ac | 2202 | if (rt->rt6i_table) |
9e762a4a | 2203 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2204 | else |
9e762a4a PM |
2205 | table = RT6_TABLE_UNSPEC; |
2206 | rtm->rtm_table = table; | |
2d7202bf | 2207 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2208 | if (rt->rt6i_flags&RTF_REJECT) |
2209 | rtm->rtm_type = RTN_UNREACHABLE; | |
2210 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2211 | rtm->rtm_type = RTN_LOCAL; | |
2212 | else | |
2213 | rtm->rtm_type = RTN_UNICAST; | |
2214 | rtm->rtm_flags = 0; | |
2215 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2216 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2217 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2218 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2219 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2220 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2221 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2222 | rtm->rtm_protocol = RTPROT_RA; | |
2223 | ||
2224 | if (rt->rt6i_flags&RTF_CACHE) | |
2225 | rtm->rtm_flags |= RTM_F_CLONED; | |
2226 | ||
2227 | if (dst) { | |
2d7202bf | 2228 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2229 | rtm->rtm_dst_len = 128; |
1da177e4 | 2230 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2231 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2232 | #ifdef CONFIG_IPV6_SUBTREES |
2233 | if (src) { | |
2d7202bf | 2234 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2235 | rtm->rtm_src_len = 128; |
1da177e4 | 2236 | } else if (rtm->rtm_src_len) |
2d7202bf | 2237 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2238 | #endif |
7bc570c8 YH |
2239 | if (iif) { |
2240 | #ifdef CONFIG_IPV6_MROUTE | |
2241 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2242 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2243 | if (err <= 0) { |
2244 | if (!nowait) { | |
2245 | if (err == 0) | |
2246 | return 0; | |
2247 | goto nla_put_failure; | |
2248 | } else { | |
2249 | if (err == -EMSGSIZE) | |
2250 | goto nla_put_failure; | |
2251 | } | |
2252 | } | |
2253 | } else | |
2254 | #endif | |
2255 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2256 | } else if (dst) { | |
5e0115e5 | 2257 | struct inet6_dev *idev = ip6_dst_idev(&rt->u.dst); |
1da177e4 | 2258 | struct in6_addr saddr_buf; |
191cd582 | 2259 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2260 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2261 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2262 | } |
2d7202bf | 2263 | |
1da177e4 | 2264 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2265 | goto nla_put_failure; |
2266 | ||
1da177e4 | 2267 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2268 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2269 | ||
1da177e4 | 2270 | if (rt->u.dst.dev) |
2d7202bf TG |
2271 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2272 | ||
2273 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2274 | |
36e3deae YH |
2275 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2276 | expires = 0; | |
2277 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2278 | expires = rt->rt6i_expires - jiffies; | |
2279 | else | |
2280 | expires = INT_MAX; | |
69cdf8f9 | 2281 | |
e3703b3d TG |
2282 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, |
2283 | expires, rt->u.dst.error) < 0) | |
2284 | goto nla_put_failure; | |
2d7202bf TG |
2285 | |
2286 | return nlmsg_end(skb, nlh); | |
2287 | ||
2288 | nla_put_failure: | |
26932566 PM |
2289 | nlmsg_cancel(skb, nlh); |
2290 | return -EMSGSIZE; | |
1da177e4 LT |
2291 | } |
2292 | ||
1b43af54 | 2293 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2294 | { |
2295 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2296 | int prefix; | |
2297 | ||
2d7202bf TG |
2298 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2299 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2300 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2301 | } else | |
2302 | prefix = 0; | |
2303 | ||
191cd582 BH |
2304 | return rt6_fill_node(arg->net, |
2305 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2306 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2307 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2308 | } |
2309 | ||
c127ea2c | 2310 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2311 | { |
3b1e0a65 | 2312 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2313 | struct nlattr *tb[RTA_MAX+1]; |
2314 | struct rt6_info *rt; | |
1da177e4 | 2315 | struct sk_buff *skb; |
ab364a6f | 2316 | struct rtmsg *rtm; |
1da177e4 | 2317 | struct flowi fl; |
ab364a6f | 2318 | int err, iif = 0; |
1da177e4 | 2319 | |
ab364a6f TG |
2320 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2321 | if (err < 0) | |
2322 | goto errout; | |
1da177e4 | 2323 | |
ab364a6f | 2324 | err = -EINVAL; |
1da177e4 | 2325 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2326 | |
ab364a6f TG |
2327 | if (tb[RTA_SRC]) { |
2328 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2329 | goto errout; | |
2330 | ||
2331 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2332 | } | |
2333 | ||
2334 | if (tb[RTA_DST]) { | |
2335 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2336 | goto errout; | |
2337 | ||
2338 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2339 | } | |
2340 | ||
2341 | if (tb[RTA_IIF]) | |
2342 | iif = nla_get_u32(tb[RTA_IIF]); | |
2343 | ||
2344 | if (tb[RTA_OIF]) | |
2345 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2346 | |
2347 | if (iif) { | |
2348 | struct net_device *dev; | |
5578689a | 2349 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2350 | if (!dev) { |
2351 | err = -ENODEV; | |
ab364a6f | 2352 | goto errout; |
1da177e4 LT |
2353 | } |
2354 | } | |
2355 | ||
ab364a6f TG |
2356 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2357 | if (skb == NULL) { | |
2358 | err = -ENOBUFS; | |
2359 | goto errout; | |
2360 | } | |
1da177e4 | 2361 | |
ab364a6f TG |
2362 | /* Reserve room for dummy headers, this skb can pass |
2363 | through good chunk of routing engine. | |
2364 | */ | |
459a98ed | 2365 | skb_reset_mac_header(skb); |
ab364a6f | 2366 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2367 | |
8a3edd80 | 2368 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
adf30907 | 2369 | skb_dst_set(skb, &rt->u.dst); |
1da177e4 | 2370 | |
191cd582 | 2371 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2372 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2373 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2374 | if (err < 0) { |
ab364a6f TG |
2375 | kfree_skb(skb); |
2376 | goto errout; | |
1da177e4 LT |
2377 | } |
2378 | ||
5578689a | 2379 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2380 | errout: |
1da177e4 | 2381 | return err; |
1da177e4 LT |
2382 | } |
2383 | ||
86872cb5 | 2384 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2385 | { |
2386 | struct sk_buff *skb; | |
5578689a | 2387 | struct net *net = info->nl_net; |
528c4ceb DL |
2388 | u32 seq; |
2389 | int err; | |
2390 | ||
2391 | err = -ENOBUFS; | |
2392 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2393 | |
339bf98f | 2394 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2395 | if (skb == NULL) |
2396 | goto errout; | |
2397 | ||
191cd582 | 2398 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2399 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2400 | if (err < 0) { |
2401 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2402 | WARN_ON(err == -EMSGSIZE); | |
2403 | kfree_skb(skb); | |
2404 | goto errout; | |
2405 | } | |
1ce85fe4 PNA |
2406 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2407 | info->nlh, gfp_any()); | |
2408 | return; | |
21713ebc TG |
2409 | errout: |
2410 | if (err < 0) | |
5578689a | 2411 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2412 | } |
2413 | ||
8ed67789 DL |
2414 | static int ip6_route_dev_notify(struct notifier_block *this, |
2415 | unsigned long event, void *data) | |
2416 | { | |
2417 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2418 | struct net *net = dev_net(dev); |
8ed67789 DL |
2419 | |
2420 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2421 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2422 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2423 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2424 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2425 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2426 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2427 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2428 | #endif | |
2429 | } | |
2430 | ||
2431 | return NOTIFY_OK; | |
2432 | } | |
2433 | ||
1da177e4 LT |
2434 | /* |
2435 | * /proc | |
2436 | */ | |
2437 | ||
2438 | #ifdef CONFIG_PROC_FS | |
2439 | ||
2440 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2441 | ||
2442 | struct rt6_proc_arg | |
2443 | { | |
2444 | char *buffer; | |
2445 | int offset; | |
2446 | int length; | |
2447 | int skip; | |
2448 | int len; | |
2449 | }; | |
2450 | ||
2451 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2452 | { | |
33120b30 | 2453 | struct seq_file *m = p_arg; |
1da177e4 | 2454 | |
4b7a4274 | 2455 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2456 | |
2457 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2458 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2459 | #else |
33120b30 | 2460 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2461 | #endif |
2462 | ||
2463 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2464 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2465 | } else { |
33120b30 | 2466 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2467 | } |
33120b30 AD |
2468 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2469 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2470 | rt->u.dst.__use, rt->rt6i_flags, | |
2471 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2472 | return 0; |
2473 | } | |
2474 | ||
33120b30 | 2475 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2476 | { |
f3db4851 DL |
2477 | struct net *net = (struct net *)m->private; |
2478 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2479 | return 0; |
2480 | } | |
1da177e4 | 2481 | |
33120b30 AD |
2482 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2483 | { | |
de05c557 | 2484 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2485 | } |
2486 | ||
33120b30 AD |
2487 | static const struct file_operations ipv6_route_proc_fops = { |
2488 | .owner = THIS_MODULE, | |
2489 | .open = ipv6_route_open, | |
2490 | .read = seq_read, | |
2491 | .llseek = seq_lseek, | |
b6fcbdb4 | 2492 | .release = single_release_net, |
33120b30 AD |
2493 | }; |
2494 | ||
1da177e4 LT |
2495 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2496 | { | |
69ddb805 | 2497 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2498 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2499 | net->ipv6.rt6_stats->fib_nodes, |
2500 | net->ipv6.rt6_stats->fib_route_nodes, | |
2501 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2502 | net->ipv6.rt6_stats->fib_rt_entries, | |
2503 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2504 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2505 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2506 | |
2507 | return 0; | |
2508 | } | |
2509 | ||
2510 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2511 | { | |
de05c557 | 2512 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2513 | } |
2514 | ||
9a32144e | 2515 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2516 | .owner = THIS_MODULE, |
2517 | .open = rt6_stats_seq_open, | |
2518 | .read = seq_read, | |
2519 | .llseek = seq_lseek, | |
b6fcbdb4 | 2520 | .release = single_release_net, |
1da177e4 LT |
2521 | }; |
2522 | #endif /* CONFIG_PROC_FS */ | |
2523 | ||
2524 | #ifdef CONFIG_SYSCTL | |
2525 | ||
1da177e4 LT |
2526 | static |
2527 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2528 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2529 | { | |
5b7c931d DL |
2530 | struct net *net = current->nsproxy->net_ns; |
2531 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2532 | if (write) { |
2533 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2534 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2535 | return 0; |
2536 | } else | |
2537 | return -EINVAL; | |
2538 | } | |
2539 | ||
760f2d01 | 2540 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2541 | { |
1da177e4 | 2542 | .procname = "flush", |
4990509f | 2543 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2544 | .maxlen = sizeof(int), |
89c8b3a1 | 2545 | .mode = 0200, |
6d9f239a | 2546 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2547 | }, |
2548 | { | |
2549 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2550 | .procname = "gc_thresh", | |
9a7ec3a9 | 2551 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2552 | .maxlen = sizeof(int), |
2553 | .mode = 0644, | |
6d9f239a | 2554 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2555 | }, |
2556 | { | |
2557 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2558 | .procname = "max_size", | |
4990509f | 2559 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2560 | .maxlen = sizeof(int), |
2561 | .mode = 0644, | |
6d9f239a | 2562 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2563 | }, |
2564 | { | |
2565 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2566 | .procname = "gc_min_interval", | |
4990509f | 2567 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2568 | .maxlen = sizeof(int), |
2569 | .mode = 0644, | |
6d9f239a AD |
2570 | .proc_handler = proc_dointvec_jiffies, |
2571 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2572 | }, |
2573 | { | |
2574 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2575 | .procname = "gc_timeout", | |
4990509f | 2576 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2577 | .maxlen = sizeof(int), |
2578 | .mode = 0644, | |
6d9f239a AD |
2579 | .proc_handler = proc_dointvec_jiffies, |
2580 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2581 | }, |
2582 | { | |
2583 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2584 | .procname = "gc_interval", | |
4990509f | 2585 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2586 | .maxlen = sizeof(int), |
2587 | .mode = 0644, | |
6d9f239a AD |
2588 | .proc_handler = proc_dointvec_jiffies, |
2589 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2590 | }, |
2591 | { | |
2592 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2593 | .procname = "gc_elasticity", | |
4990509f | 2594 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2595 | .maxlen = sizeof(int), |
2596 | .mode = 0644, | |
6d9f239a AD |
2597 | .proc_handler = proc_dointvec_jiffies, |
2598 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2599 | }, |
2600 | { | |
2601 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2602 | .procname = "mtu_expires", | |
4990509f | 2603 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2604 | .maxlen = sizeof(int), |
2605 | .mode = 0644, | |
6d9f239a AD |
2606 | .proc_handler = proc_dointvec_jiffies, |
2607 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2608 | }, |
2609 | { | |
2610 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2611 | .procname = "min_adv_mss", | |
4990509f | 2612 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2613 | .maxlen = sizeof(int), |
2614 | .mode = 0644, | |
6d9f239a AD |
2615 | .proc_handler = proc_dointvec_jiffies, |
2616 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2617 | }, |
2618 | { | |
2619 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2620 | .procname = "gc_min_interval_ms", | |
4990509f | 2621 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2622 | .maxlen = sizeof(int), |
2623 | .mode = 0644, | |
6d9f239a AD |
2624 | .proc_handler = proc_dointvec_ms_jiffies, |
2625 | .strategy = sysctl_ms_jiffies, | |
1da177e4 LT |
2626 | }, |
2627 | { .ctl_name = 0 } | |
2628 | }; | |
2629 | ||
760f2d01 DL |
2630 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2631 | { | |
2632 | struct ctl_table *table; | |
2633 | ||
2634 | table = kmemdup(ipv6_route_table_template, | |
2635 | sizeof(ipv6_route_table_template), | |
2636 | GFP_KERNEL); | |
5ee09105 YH |
2637 | |
2638 | if (table) { | |
2639 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2640 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2641 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2642 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2643 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2644 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2645 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2646 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2647 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2648 | } | |
2649 | ||
760f2d01 DL |
2650 | return table; |
2651 | } | |
1da177e4 LT |
2652 | #endif |
2653 | ||
cdb18761 DL |
2654 | static int ip6_route_net_init(struct net *net) |
2655 | { | |
633d424b | 2656 | int ret = -ENOMEM; |
8ed67789 | 2657 | |
f2fc6a54 BT |
2658 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2659 | sizeof(*net->ipv6.ip6_dst_ops), | |
2660 | GFP_KERNEL); | |
2661 | if (!net->ipv6.ip6_dst_ops) | |
2662 | goto out; | |
48115bec | 2663 | net->ipv6.ip6_dst_ops->dst_net = hold_net(net); |
f2fc6a54 | 2664 | |
8ed67789 DL |
2665 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2666 | sizeof(*net->ipv6.ip6_null_entry), | |
2667 | GFP_KERNEL); | |
2668 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2669 | goto out_ip6_dst_ops; |
8ed67789 DL |
2670 | net->ipv6.ip6_null_entry->u.dst.path = |
2671 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2672 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2673 | |
2674 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2675 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2676 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2677 | GFP_KERNEL); | |
68fffc67 PZ |
2678 | if (!net->ipv6.ip6_prohibit_entry) |
2679 | goto out_ip6_null_entry; | |
8ed67789 DL |
2680 | net->ipv6.ip6_prohibit_entry->u.dst.path = |
2681 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2682 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2683 | |
2684 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2685 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2686 | GFP_KERNEL); | |
68fffc67 PZ |
2687 | if (!net->ipv6.ip6_blk_hole_entry) |
2688 | goto out_ip6_prohibit_entry; | |
8ed67789 DL |
2689 | net->ipv6.ip6_blk_hole_entry->u.dst.path = |
2690 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2691 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2692 | #endif |
2693 | ||
b339a47c PZ |
2694 | net->ipv6.sysctl.flush_delay = 0; |
2695 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2696 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2697 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2698 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2699 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2700 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2701 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2702 | ||
cdb18761 DL |
2703 | #ifdef CONFIG_PROC_FS |
2704 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2705 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2706 | #endif | |
6891a346 BT |
2707 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2708 | ||
8ed67789 DL |
2709 | ret = 0; |
2710 | out: | |
2711 | return ret; | |
f2fc6a54 | 2712 | |
68fffc67 PZ |
2713 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2714 | out_ip6_prohibit_entry: | |
2715 | kfree(net->ipv6.ip6_prohibit_entry); | |
2716 | out_ip6_null_entry: | |
2717 | kfree(net->ipv6.ip6_null_entry); | |
2718 | #endif | |
f2fc6a54 | 2719 | out_ip6_dst_ops: |
48115bec | 2720 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 BT |
2721 | kfree(net->ipv6.ip6_dst_ops); |
2722 | goto out; | |
cdb18761 DL |
2723 | } |
2724 | ||
2725 | static void ip6_route_net_exit(struct net *net) | |
2726 | { | |
2727 | #ifdef CONFIG_PROC_FS | |
2728 | proc_net_remove(net, "ipv6_route"); | |
2729 | proc_net_remove(net, "rt6_stats"); | |
2730 | #endif | |
8ed67789 DL |
2731 | kfree(net->ipv6.ip6_null_entry); |
2732 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2733 | kfree(net->ipv6.ip6_prohibit_entry); | |
2734 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2735 | #endif | |
48115bec | 2736 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 | 2737 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2738 | } |
2739 | ||
2740 | static struct pernet_operations ip6_route_net_ops = { | |
2741 | .init = ip6_route_net_init, | |
2742 | .exit = ip6_route_net_exit, | |
2743 | }; | |
2744 | ||
8ed67789 DL |
2745 | static struct notifier_block ip6_route_dev_notifier = { |
2746 | .notifier_call = ip6_route_dev_notify, | |
2747 | .priority = 0, | |
2748 | }; | |
2749 | ||
433d49c3 | 2750 | int __init ip6_route_init(void) |
1da177e4 | 2751 | { |
433d49c3 DL |
2752 | int ret; |
2753 | ||
9a7ec3a9 DL |
2754 | ret = -ENOMEM; |
2755 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2756 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2757 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2758 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2759 | goto out; |
14e50e57 | 2760 | |
8ed67789 DL |
2761 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2762 | if (ret) | |
bdb3289f | 2763 | goto out_kmem_cache; |
bdb3289f | 2764 | |
5dc121e9 AE |
2765 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2766 | ||
8ed67789 DL |
2767 | /* Registering of the loopback is done before this portion of code, |
2768 | * the loopback reference in rt6_info will not be taken, do it | |
2769 | * manually for init_net */ | |
2770 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2771 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2772 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2773 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2774 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2775 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2776 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2777 | #endif | |
433d49c3 DL |
2778 | ret = fib6_init(); |
2779 | if (ret) | |
8ed67789 | 2780 | goto out_register_subsys; |
433d49c3 | 2781 | |
433d49c3 DL |
2782 | ret = xfrm6_init(); |
2783 | if (ret) | |
cdb18761 | 2784 | goto out_fib6_init; |
c35b7e72 | 2785 | |
433d49c3 DL |
2786 | ret = fib6_rules_init(); |
2787 | if (ret) | |
2788 | goto xfrm6_init; | |
7e5449c2 | 2789 | |
433d49c3 DL |
2790 | ret = -ENOBUFS; |
2791 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2792 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2793 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2794 | goto fib6_rules_init; | |
c127ea2c | 2795 | |
8ed67789 | 2796 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2797 | if (ret) |
2798 | goto fib6_rules_init; | |
8ed67789 | 2799 | |
433d49c3 DL |
2800 | out: |
2801 | return ret; | |
2802 | ||
2803 | fib6_rules_init: | |
433d49c3 DL |
2804 | fib6_rules_cleanup(); |
2805 | xfrm6_init: | |
433d49c3 | 2806 | xfrm6_fini(); |
433d49c3 | 2807 | out_fib6_init: |
433d49c3 | 2808 | fib6_gc_cleanup(); |
8ed67789 DL |
2809 | out_register_subsys: |
2810 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2811 | out_kmem_cache: |
f2fc6a54 | 2812 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2813 | goto out; |
1da177e4 LT |
2814 | } |
2815 | ||
2816 | void ip6_route_cleanup(void) | |
2817 | { | |
8ed67789 | 2818 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2819 | fib6_rules_cleanup(); |
1da177e4 | 2820 | xfrm6_fini(); |
1da177e4 | 2821 | fib6_gc_cleanup(); |
8ed67789 | 2822 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2823 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2824 | } |