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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
7bc570c8 | 37 | #include <linux/mroute6.h> |
1da177e4 | 38 | #include <linux/init.h> |
1da177e4 | 39 | #include <linux/if_arp.h> |
1da177e4 LT |
40 | #include <linux/proc_fs.h> |
41 | #include <linux/seq_file.h> | |
5b7c931d | 42 | #include <linux/nsproxy.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
519fbd87 | 75 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 76 | |
1da177e4 LT |
77 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
78 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
89 | ||
70ceb4f5 | 90 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
91 | static struct rt6_info *rt6_add_route_info(struct net *net, |
92 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
93 | struct in6_addr *gwaddr, int ifindex, |
94 | unsigned pref); | |
efa2cea0 DL |
95 | static struct rt6_info *rt6_get_route_info(struct net *net, |
96 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
97 | struct in6_addr *gwaddr, int ifindex); |
98 | #endif | |
99 | ||
9a7ec3a9 | 100 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 101 | .family = AF_INET6, |
09640e63 | 102 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
103 | .gc = ip6_dst_gc, |
104 | .gc_thresh = 1024, | |
105 | .check = ip6_dst_check, | |
106 | .destroy = ip6_dst_destroy, | |
107 | .ifdown = ip6_dst_ifdown, | |
108 | .negative_advice = ip6_negative_advice, | |
109 | .link_failure = ip6_link_failure, | |
110 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 111 | .local_out = __ip6_local_out, |
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, | |
14e50e57 DM |
124 | }; |
125 | ||
bdb3289f | 126 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
127 | .dst = { |
128 | .__refcnt = ATOMIC_INIT(1), | |
129 | .__use = 1, | |
130 | .obsolete = -1, | |
131 | .error = -ENETUNREACH, | |
132 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
133 | .input = ip6_pkt_discard, | |
134 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
135 | }, |
136 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 137 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
138 | .rt6i_metric = ~(u32) 0, |
139 | .rt6i_ref = ATOMIC_INIT(1), | |
140 | }; | |
141 | ||
101367c2 TG |
142 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
143 | ||
6723ab54 DM |
144 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
145 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 146 | |
280a34c8 | 147 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
148 | .dst = { |
149 | .__refcnt = ATOMIC_INIT(1), | |
150 | .__use = 1, | |
151 | .obsolete = -1, | |
152 | .error = -EACCES, | |
153 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
154 | .input = ip6_pkt_prohibit, | |
155 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
156 | }, |
157 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 158 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
159 | .rt6i_metric = ~(u32) 0, |
160 | .rt6i_ref = ATOMIC_INIT(1), | |
161 | }; | |
162 | ||
bdb3289f | 163 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
164 | .dst = { |
165 | .__refcnt = ATOMIC_INIT(1), | |
166 | .__use = 1, | |
167 | .obsolete = -1, | |
168 | .error = -EINVAL, | |
169 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
170 | .input = dst_discard, | |
171 | .output = dst_discard, | |
101367c2 TG |
172 | }, |
173 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 174 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
175 | .rt6i_metric = ~(u32) 0, |
176 | .rt6i_ref = ATOMIC_INIT(1), | |
177 | }; | |
178 | ||
179 | #endif | |
180 | ||
1da177e4 | 181 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 182 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 183 | { |
f2fc6a54 | 184 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
185 | } |
186 | ||
187 | static void ip6_dst_destroy(struct dst_entry *dst) | |
188 | { | |
189 | struct rt6_info *rt = (struct rt6_info *)dst; | |
190 | struct inet6_dev *idev = rt->rt6i_idev; | |
191 | ||
192 | if (idev != NULL) { | |
193 | rt->rt6i_idev = NULL; | |
194 | in6_dev_put(idev); | |
1ab1457c | 195 | } |
1da177e4 LT |
196 | } |
197 | ||
198 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
199 | int how) | |
200 | { | |
201 | struct rt6_info *rt = (struct rt6_info *)dst; | |
202 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 203 | struct net_device *loopback_dev = |
c346dca1 | 204 | dev_net(dev)->loopback_dev; |
1da177e4 | 205 | |
5a3e55d6 DL |
206 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
207 | struct inet6_dev *loopback_idev = | |
208 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
209 | if (loopback_idev != NULL) { |
210 | rt->rt6i_idev = loopback_idev; | |
211 | in6_dev_put(idev); | |
212 | } | |
213 | } | |
214 | } | |
215 | ||
216 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
217 | { | |
a02cec21 ED |
218 | return (rt->rt6i_flags & RTF_EXPIRES) && |
219 | time_after(jiffies, rt->rt6i_expires); | |
1da177e4 LT |
220 | } |
221 | ||
c71099ac TG |
222 | static inline int rt6_need_strict(struct in6_addr *daddr) |
223 | { | |
a02cec21 ED |
224 | return ipv6_addr_type(daddr) & |
225 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
226 | } |
227 | ||
1da177e4 | 228 | /* |
c71099ac | 229 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
230 | */ |
231 | ||
8ed67789 DL |
232 | static inline struct rt6_info *rt6_device_match(struct net *net, |
233 | struct rt6_info *rt, | |
dd3abc4e | 234 | struct in6_addr *saddr, |
1da177e4 | 235 | int oif, |
d420895e | 236 | int flags) |
1da177e4 LT |
237 | { |
238 | struct rt6_info *local = NULL; | |
239 | struct rt6_info *sprt; | |
240 | ||
dd3abc4e YH |
241 | if (!oif && ipv6_addr_any(saddr)) |
242 | goto out; | |
243 | ||
d8d1f30b | 244 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
dd3abc4e YH |
245 | struct net_device *dev = sprt->rt6i_dev; |
246 | ||
247 | if (oif) { | |
1da177e4 LT |
248 | if (dev->ifindex == oif) |
249 | return sprt; | |
250 | if (dev->flags & IFF_LOOPBACK) { | |
251 | if (sprt->rt6i_idev == NULL || | |
252 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 253 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 254 | continue; |
1ab1457c | 255 | if (local && (!oif || |
1da177e4 LT |
256 | local->rt6i_idev->dev->ifindex == oif)) |
257 | continue; | |
258 | } | |
259 | local = sprt; | |
260 | } | |
dd3abc4e YH |
261 | } else { |
262 | if (ipv6_chk_addr(net, saddr, dev, | |
263 | flags & RT6_LOOKUP_F_IFACE)) | |
264 | return sprt; | |
1da177e4 | 265 | } |
dd3abc4e | 266 | } |
1da177e4 | 267 | |
dd3abc4e | 268 | if (oif) { |
1da177e4 LT |
269 | if (local) |
270 | return local; | |
271 | ||
d420895e | 272 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 273 | return net->ipv6.ip6_null_entry; |
1da177e4 | 274 | } |
dd3abc4e | 275 | out: |
1da177e4 LT |
276 | return rt; |
277 | } | |
278 | ||
27097255 YH |
279 | #ifdef CONFIG_IPV6_ROUTER_PREF |
280 | static void rt6_probe(struct rt6_info *rt) | |
281 | { | |
282 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
283 | /* | |
284 | * Okay, this does not seem to be appropriate | |
285 | * for now, however, we need to check if it | |
286 | * is really so; aka Router Reachability Probing. | |
287 | * | |
288 | * Router Reachability Probe MUST be rate-limited | |
289 | * to no more than one per minute. | |
290 | */ | |
291 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
292 | return; | |
293 | read_lock_bh(&neigh->lock); | |
294 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 295 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
296 | struct in6_addr mcaddr; |
297 | struct in6_addr *target; | |
298 | ||
299 | neigh->updated = jiffies; | |
300 | read_unlock_bh(&neigh->lock); | |
301 | ||
302 | target = (struct in6_addr *)&neigh->primary_key; | |
303 | addrconf_addr_solict_mult(target, &mcaddr); | |
304 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
305 | } else | |
306 | read_unlock_bh(&neigh->lock); | |
307 | } | |
308 | #else | |
309 | static inline void rt6_probe(struct rt6_info *rt) | |
310 | { | |
27097255 YH |
311 | } |
312 | #endif | |
313 | ||
1da177e4 | 314 | /* |
554cfb7e | 315 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 316 | */ |
b6f99a21 | 317 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
318 | { |
319 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 320 | if (!oif || dev->ifindex == oif) |
554cfb7e | 321 | return 2; |
161980f4 DM |
322 | if ((dev->flags & IFF_LOOPBACK) && |
323 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
324 | return 1; | |
325 | return 0; | |
554cfb7e | 326 | } |
1da177e4 | 327 | |
b6f99a21 | 328 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 329 | { |
554cfb7e | 330 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 331 | int m; |
4d0c5911 YH |
332 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
333 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
334 | m = 1; | |
335 | else if (neigh) { | |
554cfb7e YH |
336 | read_lock_bh(&neigh->lock); |
337 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 338 | m = 2; |
398bcbeb YH |
339 | #ifdef CONFIG_IPV6_ROUTER_PREF |
340 | else if (neigh->nud_state & NUD_FAILED) | |
341 | m = 0; | |
342 | #endif | |
343 | else | |
ea73ee23 | 344 | m = 1; |
554cfb7e | 345 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
346 | } else |
347 | m = 0; | |
554cfb7e | 348 | return m; |
1da177e4 LT |
349 | } |
350 | ||
554cfb7e YH |
351 | static int rt6_score_route(struct rt6_info *rt, int oif, |
352 | int strict) | |
1da177e4 | 353 | { |
4d0c5911 | 354 | int m, n; |
1ab1457c | 355 | |
4d0c5911 | 356 | m = rt6_check_dev(rt, oif); |
77d16f45 | 357 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 358 | return -1; |
ebacaaa0 YH |
359 | #ifdef CONFIG_IPV6_ROUTER_PREF |
360 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
361 | #endif | |
4d0c5911 | 362 | n = rt6_check_neigh(rt); |
557e92ef | 363 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
364 | return -1; |
365 | return m; | |
366 | } | |
367 | ||
f11e6659 DM |
368 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
369 | int *mpri, struct rt6_info *match) | |
554cfb7e | 370 | { |
f11e6659 DM |
371 | int m; |
372 | ||
373 | if (rt6_check_expired(rt)) | |
374 | goto out; | |
375 | ||
376 | m = rt6_score_route(rt, oif, strict); | |
377 | if (m < 0) | |
378 | goto out; | |
379 | ||
380 | if (m > *mpri) { | |
381 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
382 | rt6_probe(match); | |
383 | *mpri = m; | |
384 | match = rt; | |
385 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
386 | rt6_probe(rt); | |
387 | } | |
388 | ||
389 | out: | |
390 | return match; | |
391 | } | |
392 | ||
393 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
394 | struct rt6_info *rr_head, | |
395 | u32 metric, int oif, int strict) | |
396 | { | |
397 | struct rt6_info *rt, *match; | |
554cfb7e | 398 | int mpri = -1; |
1da177e4 | 399 | |
f11e6659 DM |
400 | match = NULL; |
401 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 402 | rt = rt->dst.rt6_next) |
f11e6659 DM |
403 | match = find_match(rt, oif, strict, &mpri, match); |
404 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 405 | rt = rt->dst.rt6_next) |
f11e6659 | 406 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 407 | |
f11e6659 DM |
408 | return match; |
409 | } | |
1da177e4 | 410 | |
f11e6659 DM |
411 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
412 | { | |
413 | struct rt6_info *match, *rt0; | |
8ed67789 | 414 | struct net *net; |
1da177e4 | 415 | |
f11e6659 | 416 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 417 | __func__, fn->leaf, oif); |
554cfb7e | 418 | |
f11e6659 DM |
419 | rt0 = fn->rr_ptr; |
420 | if (!rt0) | |
421 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 422 | |
f11e6659 | 423 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 424 | |
554cfb7e | 425 | if (!match && |
f11e6659 | 426 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 427 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 428 | |
554cfb7e | 429 | /* no entries matched; do round-robin */ |
f11e6659 DM |
430 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
431 | next = fn->leaf; | |
432 | ||
433 | if (next != rt0) | |
434 | fn->rr_ptr = next; | |
1da177e4 | 435 | } |
1da177e4 | 436 | |
f11e6659 | 437 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 438 | __func__, match); |
1da177e4 | 439 | |
c346dca1 | 440 | net = dev_net(rt0->rt6i_dev); |
a02cec21 | 441 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
442 | } |
443 | ||
70ceb4f5 YH |
444 | #ifdef CONFIG_IPV6_ROUTE_INFO |
445 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
446 | struct in6_addr *gwaddr) | |
447 | { | |
c346dca1 | 448 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
449 | struct route_info *rinfo = (struct route_info *) opt; |
450 | struct in6_addr prefix_buf, *prefix; | |
451 | unsigned int pref; | |
4bed72e4 | 452 | unsigned long lifetime; |
70ceb4f5 YH |
453 | struct rt6_info *rt; |
454 | ||
455 | if (len < sizeof(struct route_info)) { | |
456 | return -EINVAL; | |
457 | } | |
458 | ||
459 | /* Sanity check for prefix_len and length */ | |
460 | if (rinfo->length > 3) { | |
461 | return -EINVAL; | |
462 | } else if (rinfo->prefix_len > 128) { | |
463 | return -EINVAL; | |
464 | } else if (rinfo->prefix_len > 64) { | |
465 | if (rinfo->length < 2) { | |
466 | return -EINVAL; | |
467 | } | |
468 | } else if (rinfo->prefix_len > 0) { | |
469 | if (rinfo->length < 1) { | |
470 | return -EINVAL; | |
471 | } | |
472 | } | |
473 | ||
474 | pref = rinfo->route_pref; | |
475 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 476 | return -EINVAL; |
70ceb4f5 | 477 | |
4bed72e4 | 478 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
479 | |
480 | if (rinfo->length == 3) | |
481 | prefix = (struct in6_addr *)rinfo->prefix; | |
482 | else { | |
483 | /* this function is safe */ | |
484 | ipv6_addr_prefix(&prefix_buf, | |
485 | (struct in6_addr *)rinfo->prefix, | |
486 | rinfo->prefix_len); | |
487 | prefix = &prefix_buf; | |
488 | } | |
489 | ||
efa2cea0 DL |
490 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
491 | dev->ifindex); | |
70ceb4f5 YH |
492 | |
493 | if (rt && !lifetime) { | |
e0a1ad73 | 494 | ip6_del_rt(rt); |
70ceb4f5 YH |
495 | rt = NULL; |
496 | } | |
497 | ||
498 | if (!rt && lifetime) | |
efa2cea0 | 499 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
500 | pref); |
501 | else if (rt) | |
502 | rt->rt6i_flags = RTF_ROUTEINFO | | |
503 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
504 | ||
505 | if (rt) { | |
4bed72e4 | 506 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
507 | rt->rt6i_flags &= ~RTF_EXPIRES; |
508 | } else { | |
509 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
510 | rt->rt6i_flags |= RTF_EXPIRES; | |
511 | } | |
d8d1f30b | 512 | dst_release(&rt->dst); |
70ceb4f5 YH |
513 | } |
514 | return 0; | |
515 | } | |
516 | #endif | |
517 | ||
8ed67789 | 518 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 519 | do { \ |
8ed67789 | 520 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 521 | struct fib6_node *pn; \ |
e0eda7bb | 522 | while (1) { \ |
982f56f3 YH |
523 | if (fn->fn_flags & RTN_TL_ROOT) \ |
524 | goto out; \ | |
525 | pn = fn->parent; \ | |
526 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 527 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
528 | else \ |
529 | fn = pn; \ | |
530 | if (fn->fn_flags & RTN_RTINFO) \ | |
531 | goto restart; \ | |
c71099ac | 532 | } \ |
c71099ac | 533 | } \ |
982f56f3 | 534 | } while(0) |
c71099ac | 535 | |
8ed67789 DL |
536 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
537 | struct fib6_table *table, | |
c71099ac | 538 | struct flowi *fl, int flags) |
1da177e4 LT |
539 | { |
540 | struct fib6_node *fn; | |
541 | struct rt6_info *rt; | |
542 | ||
c71099ac TG |
543 | read_lock_bh(&table->tb6_lock); |
544 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
545 | restart: | |
546 | rt = fn->leaf; | |
dd3abc4e | 547 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 548 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 549 | out: |
d8d1f30b | 550 | dst_use(&rt->dst, jiffies); |
c71099ac | 551 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
552 | return rt; |
553 | ||
554 | } | |
555 | ||
9acd9f3a YH |
556 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
557 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
558 | { |
559 | struct flowi fl = { | |
560 | .oif = oif, | |
5811662b | 561 | .fl6_dst = *daddr, |
c71099ac TG |
562 | }; |
563 | struct dst_entry *dst; | |
77d16f45 | 564 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 565 | |
adaa70bb TG |
566 | if (saddr) { |
567 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
568 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
569 | } | |
570 | ||
606a2b48 | 571 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
572 | if (dst->error == 0) |
573 | return (struct rt6_info *) dst; | |
574 | ||
575 | dst_release(dst); | |
576 | ||
1da177e4 LT |
577 | return NULL; |
578 | } | |
579 | ||
7159039a YH |
580 | EXPORT_SYMBOL(rt6_lookup); |
581 | ||
c71099ac | 582 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
583 | It takes new route entry, the addition fails by any reason the |
584 | route is freed. In any case, if caller does not hold it, it may | |
585 | be destroyed. | |
586 | */ | |
587 | ||
86872cb5 | 588 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
589 | { |
590 | int err; | |
c71099ac | 591 | struct fib6_table *table; |
1da177e4 | 592 | |
c71099ac TG |
593 | table = rt->rt6i_table; |
594 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 595 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 596 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
597 | |
598 | return err; | |
599 | } | |
600 | ||
40e22e8f TG |
601 | int ip6_ins_rt(struct rt6_info *rt) |
602 | { | |
4d1169c1 | 603 | struct nl_info info = { |
c346dca1 | 604 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 605 | }; |
528c4ceb | 606 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
607 | } |
608 | ||
95a9a5ba YH |
609 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
610 | struct in6_addr *saddr) | |
1da177e4 | 611 | { |
1da177e4 LT |
612 | struct rt6_info *rt; |
613 | ||
614 | /* | |
615 | * Clone the route. | |
616 | */ | |
617 | ||
618 | rt = ip6_rt_copy(ort); | |
619 | ||
620 | if (rt) { | |
14deae41 DM |
621 | struct neighbour *neigh; |
622 | int attempts = !in_softirq(); | |
623 | ||
58c4fb86 YH |
624 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
625 | if (rt->rt6i_dst.plen != 128 && | |
626 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
627 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 628 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 629 | } |
1da177e4 | 630 | |
58c4fb86 | 631 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
632 | rt->rt6i_dst.plen = 128; |
633 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 634 | rt->dst.flags |= DST_HOST; |
1da177e4 LT |
635 | |
636 | #ifdef CONFIG_IPV6_SUBTREES | |
637 | if (rt->rt6i_src.plen && saddr) { | |
638 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
639 | rt->rt6i_src.plen = 128; | |
640 | } | |
641 | #endif | |
642 | ||
14deae41 DM |
643 | retry: |
644 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
645 | if (IS_ERR(neigh)) { | |
646 | struct net *net = dev_net(rt->rt6i_dev); | |
647 | int saved_rt_min_interval = | |
648 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
649 | int saved_rt_elasticity = | |
650 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
651 | ||
652 | if (attempts-- > 0) { | |
653 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
654 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
655 | ||
86393e52 | 656 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
657 | |
658 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
659 | saved_rt_elasticity; | |
660 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
661 | saved_rt_min_interval; | |
662 | goto retry; | |
663 | } | |
664 | ||
665 | if (net_ratelimit()) | |
666 | printk(KERN_WARNING | |
7e1b33e5 | 667 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 668 | dst_free(&rt->dst); |
14deae41 DM |
669 | return NULL; |
670 | } | |
671 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 672 | |
95a9a5ba | 673 | } |
1da177e4 | 674 | |
95a9a5ba YH |
675 | return rt; |
676 | } | |
1da177e4 | 677 | |
299d9939 YH |
678 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
679 | { | |
680 | struct rt6_info *rt = ip6_rt_copy(ort); | |
681 | if (rt) { | |
682 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
683 | rt->rt6i_dst.plen = 128; | |
684 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 685 | rt->dst.flags |= DST_HOST; |
299d9939 YH |
686 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
687 | } | |
688 | return rt; | |
689 | } | |
690 | ||
8ed67789 DL |
691 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
692 | struct flowi *fl, int flags) | |
1da177e4 LT |
693 | { |
694 | struct fib6_node *fn; | |
519fbd87 | 695 | struct rt6_info *rt, *nrt; |
c71099ac | 696 | int strict = 0; |
1da177e4 | 697 | int attempts = 3; |
519fbd87 | 698 | int err; |
53b7997f | 699 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 700 | |
77d16f45 | 701 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
702 | |
703 | relookup: | |
c71099ac | 704 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 705 | |
8238dd06 | 706 | restart_2: |
c71099ac | 707 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
708 | |
709 | restart: | |
4acad72d | 710 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
711 | |
712 | BACKTRACK(net, &fl->fl6_src); | |
713 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 714 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 715 | goto out; |
1da177e4 | 716 | |
d8d1f30b | 717 | dst_hold(&rt->dst); |
c71099ac | 718 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 719 | |
519fbd87 | 720 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 721 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
722 | else { |
723 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 724 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
725 | #else |
726 | goto out2; | |
727 | #endif | |
728 | } | |
e40cf353 | 729 | |
d8d1f30b | 730 | dst_release(&rt->dst); |
8ed67789 | 731 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 732 | |
d8d1f30b | 733 | dst_hold(&rt->dst); |
519fbd87 | 734 | if (nrt) { |
40e22e8f | 735 | err = ip6_ins_rt(nrt); |
519fbd87 | 736 | if (!err) |
1da177e4 | 737 | goto out2; |
1da177e4 | 738 | } |
1da177e4 | 739 | |
519fbd87 YH |
740 | if (--attempts <= 0) |
741 | goto out2; | |
742 | ||
743 | /* | |
c71099ac | 744 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
745 | * released someone could insert this route. Relookup. |
746 | */ | |
d8d1f30b | 747 | dst_release(&rt->dst); |
519fbd87 YH |
748 | goto relookup; |
749 | ||
750 | out: | |
8238dd06 YH |
751 | if (reachable) { |
752 | reachable = 0; | |
753 | goto restart_2; | |
754 | } | |
d8d1f30b | 755 | dst_hold(&rt->dst); |
c71099ac | 756 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 757 | out2: |
d8d1f30b CG |
758 | rt->dst.lastuse = jiffies; |
759 | rt->dst.__use++; | |
c71099ac TG |
760 | |
761 | return rt; | |
1da177e4 LT |
762 | } |
763 | ||
8ed67789 | 764 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
765 | struct flowi *fl, int flags) |
766 | { | |
8ed67789 | 767 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
768 | } |
769 | ||
c71099ac TG |
770 | void ip6_route_input(struct sk_buff *skb) |
771 | { | |
0660e03f | 772 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 773 | struct net *net = dev_net(skb->dev); |
adaa70bb | 774 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
775 | struct flowi fl = { |
776 | .iif = skb->dev->ifindex, | |
5811662b CG |
777 | .fl6_dst = iph->daddr, |
778 | .fl6_src = iph->saddr, | |
779 | .fl6_flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, | |
1ab1457c | 780 | .mark = skb->mark, |
c71099ac TG |
781 | .proto = iph->nexthdr, |
782 | }; | |
adaa70bb | 783 | |
1d6e55f1 | 784 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 785 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 786 | |
adf30907 | 787 | skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input)); |
c71099ac TG |
788 | } |
789 | ||
8ed67789 | 790 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 791 | struct flowi *fl, int flags) |
1da177e4 | 792 | { |
8ed67789 | 793 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
794 | } |
795 | ||
4591db4f DL |
796 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
797 | struct flowi *fl) | |
c71099ac TG |
798 | { |
799 | int flags = 0; | |
800 | ||
6057fd78 | 801 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl->fl6_dst)) |
77d16f45 | 802 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 803 | |
adaa70bb TG |
804 | if (!ipv6_addr_any(&fl->fl6_src)) |
805 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
0c9a2ac1 YH |
806 | else if (sk) |
807 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 808 | |
4591db4f | 809 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
810 | } |
811 | ||
7159039a | 812 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 813 | |
14e50e57 DM |
814 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
815 | { | |
816 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
817 | struct rt6_info *rt = (struct rt6_info *) | |
818 | dst_alloc(&ip6_dst_blackhole_ops); | |
819 | struct dst_entry *new = NULL; | |
820 | ||
821 | if (rt) { | |
d8d1f30b | 822 | new = &rt->dst; |
14e50e57 DM |
823 | |
824 | atomic_set(&new->__refcnt, 1); | |
825 | new->__use = 1; | |
352e512c HX |
826 | new->input = dst_discard; |
827 | new->output = dst_discard; | |
14e50e57 | 828 | |
d8d1f30b CG |
829 | memcpy(new->metrics, ort->dst.metrics, RTAX_MAX*sizeof(u32)); |
830 | new->dev = ort->dst.dev; | |
14e50e57 DM |
831 | if (new->dev) |
832 | dev_hold(new->dev); | |
833 | rt->rt6i_idev = ort->rt6i_idev; | |
834 | if (rt->rt6i_idev) | |
835 | in6_dev_hold(rt->rt6i_idev); | |
836 | rt->rt6i_expires = 0; | |
837 | ||
838 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
839 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
840 | rt->rt6i_metric = 0; | |
841 | ||
842 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
843 | #ifdef CONFIG_IPV6_SUBTREES | |
844 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
845 | #endif | |
846 | ||
847 | dst_free(new); | |
848 | } | |
849 | ||
850 | dst_release(*dstp); | |
851 | *dstp = new; | |
a02cec21 | 852 | return new ? 0 : -ENOMEM; |
14e50e57 DM |
853 | } |
854 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
855 | ||
1da177e4 LT |
856 | /* |
857 | * Destination cache support functions | |
858 | */ | |
859 | ||
860 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
861 | { | |
862 | struct rt6_info *rt; | |
863 | ||
864 | rt = (struct rt6_info *) dst; | |
865 | ||
10414444 | 866 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
1da177e4 LT |
867 | return dst; |
868 | ||
869 | return NULL; | |
870 | } | |
871 | ||
872 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
873 | { | |
874 | struct rt6_info *rt = (struct rt6_info *) dst; | |
875 | ||
876 | if (rt) { | |
54c1a859 YH |
877 | if (rt->rt6i_flags & RTF_CACHE) { |
878 | if (rt6_check_expired(rt)) { | |
879 | ip6_del_rt(rt); | |
880 | dst = NULL; | |
881 | } | |
882 | } else { | |
1da177e4 | 883 | dst_release(dst); |
54c1a859 YH |
884 | dst = NULL; |
885 | } | |
1da177e4 | 886 | } |
54c1a859 | 887 | return dst; |
1da177e4 LT |
888 | } |
889 | ||
890 | static void ip6_link_failure(struct sk_buff *skb) | |
891 | { | |
892 | struct rt6_info *rt; | |
893 | ||
3ffe533c | 894 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 895 | |
adf30907 | 896 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
897 | if (rt) { |
898 | if (rt->rt6i_flags&RTF_CACHE) { | |
d8d1f30b | 899 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
900 | rt->rt6i_flags |= RTF_EXPIRES; |
901 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
902 | rt->rt6i_node->fn_sernum = -1; | |
903 | } | |
904 | } | |
905 | ||
906 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
907 | { | |
908 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
909 | ||
910 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
911 | rt6->rt6i_flags |= RTF_MODIFIED; | |
912 | if (mtu < IPV6_MIN_MTU) { | |
913 | mtu = IPV6_MIN_MTU; | |
914 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
915 | } | |
916 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 917 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
918 | } |
919 | } | |
920 | ||
1da177e4 LT |
921 | static int ipv6_get_mtu(struct net_device *dev); |
922 | ||
5578689a | 923 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
924 | { |
925 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
926 | ||
5578689a DL |
927 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
928 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
929 | |
930 | /* | |
1ab1457c YH |
931 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
932 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
933 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
934 | * rely only on pmtu discovery" |
935 | */ | |
936 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
937 | mtu = IPV6_MAXPLEN; | |
938 | return mtu; | |
939 | } | |
940 | ||
3b00944c YH |
941 | static struct dst_entry *icmp6_dst_gc_list; |
942 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 943 | |
3b00944c | 944 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 945 | struct neighbour *neigh, |
9acd9f3a | 946 | const struct in6_addr *addr) |
1da177e4 LT |
947 | { |
948 | struct rt6_info *rt; | |
949 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 950 | struct net *net = dev_net(dev); |
1da177e4 LT |
951 | |
952 | if (unlikely(idev == NULL)) | |
953 | return NULL; | |
954 | ||
86393e52 | 955 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
956 | if (unlikely(rt == NULL)) { |
957 | in6_dev_put(idev); | |
958 | goto out; | |
959 | } | |
960 | ||
961 | dev_hold(dev); | |
962 | if (neigh) | |
963 | neigh_hold(neigh); | |
14deae41 | 964 | else { |
1da177e4 | 965 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
966 | if (IS_ERR(neigh)) |
967 | neigh = NULL; | |
968 | } | |
1da177e4 LT |
969 | |
970 | rt->rt6i_dev = dev; | |
971 | rt->rt6i_idev = idev; | |
972 | rt->rt6i_nexthop = neigh; | |
d8d1f30b CG |
973 | atomic_set(&rt->dst.__refcnt, 1); |
974 | rt->dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
975 | rt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
976 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->dst)); | |
977 | rt->dst.output = ip6_output; | |
1da177e4 LT |
978 | |
979 | #if 0 /* there's no chance to use these for ndisc */ | |
d8d1f30b | 980 | rt->dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1ab1457c | 981 | ? DST_HOST |
1da177e4 LT |
982 | : 0; |
983 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
984 | rt->rt6i_dst.plen = 128; | |
985 | #endif | |
986 | ||
3b00944c | 987 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
988 | rt->dst.next = icmp6_dst_gc_list; |
989 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 990 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 991 | |
5578689a | 992 | fib6_force_start_gc(net); |
1da177e4 LT |
993 | |
994 | out: | |
d8d1f30b | 995 | return &rt->dst; |
1da177e4 LT |
996 | } |
997 | ||
3d0f24a7 | 998 | int icmp6_dst_gc(void) |
1da177e4 LT |
999 | { |
1000 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 1001 | int more = 0; |
1da177e4 LT |
1002 | |
1003 | next = NULL; | |
5d0bbeeb | 1004 | |
3b00944c YH |
1005 | spin_lock_bh(&icmp6_dst_lock); |
1006 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1007 | |
1da177e4 LT |
1008 | while ((dst = *pprev) != NULL) { |
1009 | if (!atomic_read(&dst->__refcnt)) { | |
1010 | *pprev = dst->next; | |
1011 | dst_free(dst); | |
1da177e4 LT |
1012 | } else { |
1013 | pprev = &dst->next; | |
3d0f24a7 | 1014 | ++more; |
1da177e4 LT |
1015 | } |
1016 | } | |
1017 | ||
3b00944c | 1018 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1019 | |
3d0f24a7 | 1020 | return more; |
1da177e4 LT |
1021 | } |
1022 | ||
1e493d19 DM |
1023 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1024 | void *arg) | |
1025 | { | |
1026 | struct dst_entry *dst, **pprev; | |
1027 | ||
1028 | spin_lock_bh(&icmp6_dst_lock); | |
1029 | pprev = &icmp6_dst_gc_list; | |
1030 | while ((dst = *pprev) != NULL) { | |
1031 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1032 | if (func(rt, arg)) { | |
1033 | *pprev = dst->next; | |
1034 | dst_free(dst); | |
1035 | } else { | |
1036 | pprev = &dst->next; | |
1037 | } | |
1038 | } | |
1039 | spin_unlock_bh(&icmp6_dst_lock); | |
1040 | } | |
1041 | ||
569d3645 | 1042 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1043 | { |
1da177e4 | 1044 | unsigned long now = jiffies; |
86393e52 | 1045 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1046 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1047 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1048 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1049 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1050 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1051 | int entries; |
7019b78e | 1052 | |
fc66f95c | 1053 | entries = dst_entries_get_fast(ops); |
7019b78e | 1054 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1055 | entries <= rt_max_size) |
1da177e4 LT |
1056 | goto out; |
1057 | ||
6891a346 BT |
1058 | net->ipv6.ip6_rt_gc_expire++; |
1059 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1060 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1061 | entries = dst_entries_get_slow(ops); |
1062 | if (entries < ops->gc_thresh) | |
7019b78e | 1063 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1064 | out: |
7019b78e | 1065 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1066 | return entries > rt_max_size; |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1070 | but results in cleaner routing tables. | |
1071 | ||
1072 | Remove it only when all the things will work! | |
1073 | */ | |
1074 | ||
1075 | static int ipv6_get_mtu(struct net_device *dev) | |
1076 | { | |
1077 | int mtu = IPV6_MIN_MTU; | |
1078 | struct inet6_dev *idev; | |
1079 | ||
c68f24cc ED |
1080 | rcu_read_lock(); |
1081 | idev = __in6_dev_get(dev); | |
1082 | if (idev) | |
1da177e4 | 1083 | mtu = idev->cnf.mtu6; |
c68f24cc | 1084 | rcu_read_unlock(); |
1da177e4 LT |
1085 | return mtu; |
1086 | } | |
1087 | ||
6b75d090 | 1088 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1089 | { |
6b75d090 YH |
1090 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1091 | if (hoplimit < 0) { | |
1092 | struct net_device *dev = dst->dev; | |
c68f24cc ED |
1093 | struct inet6_dev *idev; |
1094 | ||
1095 | rcu_read_lock(); | |
1096 | idev = __in6_dev_get(dev); | |
1097 | if (idev) | |
6b75d090 | 1098 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1099 | else |
53b7997f | 1100 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1101 | rcu_read_unlock(); |
1da177e4 LT |
1102 | } |
1103 | return hoplimit; | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * | |
1108 | */ | |
1109 | ||
86872cb5 | 1110 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1111 | { |
1112 | int err; | |
5578689a | 1113 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1114 | struct rt6_info *rt = NULL; |
1115 | struct net_device *dev = NULL; | |
1116 | struct inet6_dev *idev = NULL; | |
c71099ac | 1117 | struct fib6_table *table; |
1da177e4 LT |
1118 | int addr_type; |
1119 | ||
86872cb5 | 1120 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1121 | return -EINVAL; |
1122 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1123 | if (cfg->fc_src_len) |
1da177e4 LT |
1124 | return -EINVAL; |
1125 | #endif | |
86872cb5 | 1126 | if (cfg->fc_ifindex) { |
1da177e4 | 1127 | err = -ENODEV; |
5578689a | 1128 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1129 | if (!dev) |
1130 | goto out; | |
1131 | idev = in6_dev_get(dev); | |
1132 | if (!idev) | |
1133 | goto out; | |
1134 | } | |
1135 | ||
86872cb5 TG |
1136 | if (cfg->fc_metric == 0) |
1137 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1138 | |
5578689a | 1139 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1140 | if (table == NULL) { |
1141 | err = -ENOBUFS; | |
1142 | goto out; | |
1143 | } | |
1144 | ||
86393e52 | 1145 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1146 | |
1147 | if (rt == NULL) { | |
1148 | err = -ENOMEM; | |
1149 | goto out; | |
1150 | } | |
1151 | ||
d8d1f30b | 1152 | rt->dst.obsolete = -1; |
6f704992 YH |
1153 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1154 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1155 | 0; | |
1da177e4 | 1156 | |
86872cb5 TG |
1157 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1158 | cfg->fc_protocol = RTPROT_BOOT; | |
1159 | rt->rt6i_protocol = cfg->fc_protocol; | |
1160 | ||
1161 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1162 | |
1163 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1164 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1165 | else if (cfg->fc_flags & RTF_LOCAL) |
1166 | rt->dst.input = ip6_input; | |
1da177e4 | 1167 | else |
d8d1f30b | 1168 | rt->dst.input = ip6_forward; |
1da177e4 | 1169 | |
d8d1f30b | 1170 | rt->dst.output = ip6_output; |
1da177e4 | 1171 | |
86872cb5 TG |
1172 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1173 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1174 | if (rt->rt6i_dst.plen == 128) |
d8d1f30b | 1175 | rt->dst.flags = DST_HOST; |
1da177e4 LT |
1176 | |
1177 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1178 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1179 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1180 | #endif |
1181 | ||
86872cb5 | 1182 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1183 | |
1184 | /* We cannot add true routes via loopback here, | |
1185 | they would result in kernel looping; promote them to reject routes | |
1186 | */ | |
86872cb5 | 1187 | if ((cfg->fc_flags & RTF_REJECT) || |
ab79ad14 MŻ |
1188 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK) |
1189 | && !(cfg->fc_flags&RTF_LOCAL))) { | |
1da177e4 | 1190 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1191 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1192 | if (dev) { |
1193 | dev_put(dev); | |
1194 | in6_dev_put(idev); | |
1195 | } | |
5578689a | 1196 | dev = net->loopback_dev; |
1da177e4 LT |
1197 | dev_hold(dev); |
1198 | idev = in6_dev_get(dev); | |
1199 | if (!idev) { | |
1200 | err = -ENODEV; | |
1201 | goto out; | |
1202 | } | |
1203 | } | |
d8d1f30b CG |
1204 | rt->dst.output = ip6_pkt_discard_out; |
1205 | rt->dst.input = ip6_pkt_discard; | |
1206 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1207 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1208 | goto install_route; | |
1209 | } | |
1210 | ||
86872cb5 | 1211 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1212 | struct in6_addr *gw_addr; |
1213 | int gwa_type; | |
1214 | ||
86872cb5 TG |
1215 | gw_addr = &cfg->fc_gateway; |
1216 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1217 | gwa_type = ipv6_addr_type(gw_addr); |
1218 | ||
1219 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1220 | struct rt6_info *grt; | |
1221 | ||
1222 | /* IPv6 strictly inhibits using not link-local | |
1223 | addresses as nexthop address. | |
1224 | Otherwise, router will not able to send redirects. | |
1225 | It is very good, but in some (rare!) circumstances | |
1226 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1227 | some exceptions. --ANK | |
1228 | */ | |
1229 | err = -EINVAL; | |
1230 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1231 | goto out; | |
1232 | ||
5578689a | 1233 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1234 | |
1235 | err = -EHOSTUNREACH; | |
1236 | if (grt == NULL) | |
1237 | goto out; | |
1238 | if (dev) { | |
1239 | if (dev != grt->rt6i_dev) { | |
d8d1f30b | 1240 | dst_release(&grt->dst); |
1da177e4 LT |
1241 | goto out; |
1242 | } | |
1243 | } else { | |
1244 | dev = grt->rt6i_dev; | |
1245 | idev = grt->rt6i_idev; | |
1246 | dev_hold(dev); | |
1247 | in6_dev_hold(grt->rt6i_idev); | |
1248 | } | |
1249 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1250 | err = 0; | |
d8d1f30b | 1251 | dst_release(&grt->dst); |
1da177e4 LT |
1252 | |
1253 | if (err) | |
1254 | goto out; | |
1255 | } | |
1256 | err = -EINVAL; | |
1257 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1258 | goto out; | |
1259 | } | |
1260 | ||
1261 | err = -ENODEV; | |
1262 | if (dev == NULL) | |
1263 | goto out; | |
1264 | ||
86872cb5 | 1265 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1266 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1267 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1268 | err = PTR_ERR(rt->rt6i_nexthop); | |
1269 | rt->rt6i_nexthop = NULL; | |
1270 | goto out; | |
1271 | } | |
1272 | } | |
1273 | ||
86872cb5 | 1274 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1275 | |
1276 | install_route: | |
86872cb5 TG |
1277 | if (cfg->fc_mx) { |
1278 | struct nlattr *nla; | |
1279 | int remaining; | |
1280 | ||
1281 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1282 | int type = nla_type(nla); |
86872cb5 TG |
1283 | |
1284 | if (type) { | |
1285 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1286 | err = -EINVAL; |
1287 | goto out; | |
1288 | } | |
86872cb5 | 1289 | |
d8d1f30b | 1290 | rt->dst.metrics[type - 1] = nla_get_u32(nla); |
1da177e4 | 1291 | } |
1da177e4 LT |
1292 | } |
1293 | } | |
1294 | ||
d8d1f30b CG |
1295 | if (dst_metric(&rt->dst, RTAX_HOPLIMIT) == 0) |
1296 | rt->dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1297 | if (!dst_mtu(&rt->dst)) | |
1298 | rt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1299 | if (!dst_metric(&rt->dst, RTAX_ADVMSS)) | |
1300 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->dst)); | |
1301 | rt->dst.dev = dev; | |
1da177e4 | 1302 | rt->rt6i_idev = idev; |
c71099ac | 1303 | rt->rt6i_table = table; |
63152fc0 | 1304 | |
c346dca1 | 1305 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1306 | |
86872cb5 | 1307 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1308 | |
1309 | out: | |
1310 | if (dev) | |
1311 | dev_put(dev); | |
1312 | if (idev) | |
1313 | in6_dev_put(idev); | |
1314 | if (rt) | |
d8d1f30b | 1315 | dst_free(&rt->dst); |
1da177e4 LT |
1316 | return err; |
1317 | } | |
1318 | ||
86872cb5 | 1319 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1320 | { |
1321 | int err; | |
c71099ac | 1322 | struct fib6_table *table; |
c346dca1 | 1323 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1324 | |
8ed67789 | 1325 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1326 | return -ENOENT; |
1327 | ||
c71099ac TG |
1328 | table = rt->rt6i_table; |
1329 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1330 | |
86872cb5 | 1331 | err = fib6_del(rt, info); |
d8d1f30b | 1332 | dst_release(&rt->dst); |
1da177e4 | 1333 | |
c71099ac | 1334 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1335 | |
1336 | return err; | |
1337 | } | |
1338 | ||
e0a1ad73 TG |
1339 | int ip6_del_rt(struct rt6_info *rt) |
1340 | { | |
4d1169c1 | 1341 | struct nl_info info = { |
c346dca1 | 1342 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1343 | }; |
528c4ceb | 1344 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1345 | } |
1346 | ||
86872cb5 | 1347 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1348 | { |
c71099ac | 1349 | struct fib6_table *table; |
1da177e4 LT |
1350 | struct fib6_node *fn; |
1351 | struct rt6_info *rt; | |
1352 | int err = -ESRCH; | |
1353 | ||
5578689a | 1354 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1355 | if (table == NULL) |
1356 | return err; | |
1357 | ||
1358 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1359 | |
c71099ac | 1360 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1361 | &cfg->fc_dst, cfg->fc_dst_len, |
1362 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1363 | |
1da177e4 | 1364 | if (fn) { |
d8d1f30b | 1365 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1366 | if (cfg->fc_ifindex && |
1da177e4 | 1367 | (rt->rt6i_dev == NULL || |
86872cb5 | 1368 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1369 | continue; |
86872cb5 TG |
1370 | if (cfg->fc_flags & RTF_GATEWAY && |
1371 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1372 | continue; |
86872cb5 | 1373 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1374 | continue; |
d8d1f30b | 1375 | dst_hold(&rt->dst); |
c71099ac | 1376 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1377 | |
86872cb5 | 1378 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1379 | } |
1380 | } | |
c71099ac | 1381 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1382 | |
1383 | return err; | |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * Handle redirects | |
1388 | */ | |
a6279458 YH |
1389 | struct ip6rd_flowi { |
1390 | struct flowi fl; | |
1391 | struct in6_addr gateway; | |
1392 | }; | |
1393 | ||
8ed67789 DL |
1394 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1395 | struct fib6_table *table, | |
a6279458 YH |
1396 | struct flowi *fl, |
1397 | int flags) | |
1da177e4 | 1398 | { |
a6279458 YH |
1399 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1400 | struct rt6_info *rt; | |
e843b9e1 | 1401 | struct fib6_node *fn; |
c71099ac | 1402 | |
1da177e4 | 1403 | /* |
e843b9e1 YH |
1404 | * Get the "current" route for this destination and |
1405 | * check if the redirect has come from approriate router. | |
1406 | * | |
1407 | * RFC 2461 specifies that redirects should only be | |
1408 | * accepted if they come from the nexthop to the target. | |
1409 | * Due to the way the routes are chosen, this notion | |
1410 | * is a bit fuzzy and one might need to check all possible | |
1411 | * routes. | |
1da177e4 | 1412 | */ |
1da177e4 | 1413 | |
c71099ac | 1414 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1415 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1416 | restart: |
d8d1f30b | 1417 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1418 | /* |
1419 | * Current route is on-link; redirect is always invalid. | |
1420 | * | |
1421 | * Seems, previous statement is not true. It could | |
1422 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1423 | * But then router serving it might decide, that we should | |
1424 | * know truth 8)8) --ANK (980726). | |
1425 | */ | |
1426 | if (rt6_check_expired(rt)) | |
1427 | continue; | |
1428 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1429 | continue; | |
a6279458 | 1430 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1431 | continue; |
a6279458 | 1432 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1433 | continue; |
1434 | break; | |
1435 | } | |
a6279458 | 1436 | |
cb15d9c2 | 1437 | if (!rt) |
8ed67789 DL |
1438 | rt = net->ipv6.ip6_null_entry; |
1439 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1440 | out: |
d8d1f30b | 1441 | dst_hold(&rt->dst); |
a6279458 | 1442 | |
c71099ac | 1443 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1444 | |
a6279458 YH |
1445 | return rt; |
1446 | }; | |
1447 | ||
1448 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1449 | struct in6_addr *src, | |
1450 | struct in6_addr *gateway, | |
1451 | struct net_device *dev) | |
1452 | { | |
adaa70bb | 1453 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1454 | struct net *net = dev_net(dev); |
a6279458 YH |
1455 | struct ip6rd_flowi rdfl = { |
1456 | .fl = { | |
1457 | .oif = dev->ifindex, | |
5811662b CG |
1458 | .fl6_dst = *dest, |
1459 | .fl6_src = *src, | |
a6279458 | 1460 | }, |
a6279458 | 1461 | }; |
adaa70bb | 1462 | |
86c36ce4 BH |
1463 | ipv6_addr_copy(&rdfl.gateway, gateway); |
1464 | ||
adaa70bb TG |
1465 | if (rt6_need_strict(dest)) |
1466 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1467 | |
5578689a | 1468 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1469 | flags, __ip6_route_redirect); |
a6279458 YH |
1470 | } |
1471 | ||
1472 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1473 | struct in6_addr *saddr, | |
1474 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1475 | { | |
1476 | struct rt6_info *rt, *nrt = NULL; | |
1477 | struct netevent_redirect netevent; | |
c346dca1 | 1478 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1479 | |
1480 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1481 | ||
8ed67789 | 1482 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1483 | if (net_ratelimit()) |
1484 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1485 | "for redirect target\n"); | |
a6279458 | 1486 | goto out; |
1da177e4 LT |
1487 | } |
1488 | ||
1da177e4 LT |
1489 | /* |
1490 | * We have finally decided to accept it. | |
1491 | */ | |
1492 | ||
1ab1457c | 1493 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1494 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1495 | NEIGH_UPDATE_F_OVERRIDE| | |
1496 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1497 | NEIGH_UPDATE_F_ISROUTER)) | |
1498 | ); | |
1499 | ||
1500 | /* | |
1501 | * Redirect received -> path was valid. | |
1502 | * Look, redirects are sent only in response to data packets, | |
1503 | * so that this nexthop apparently is reachable. --ANK | |
1504 | */ | |
d8d1f30b | 1505 | dst_confirm(&rt->dst); |
1da177e4 LT |
1506 | |
1507 | /* Duplicate redirect: silently ignore. */ | |
d8d1f30b | 1508 | if (neigh == rt->dst.neighbour) |
1da177e4 LT |
1509 | goto out; |
1510 | ||
1511 | nrt = ip6_rt_copy(rt); | |
1512 | if (nrt == NULL) | |
1513 | goto out; | |
1514 | ||
1515 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1516 | if (on_link) | |
1517 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1518 | ||
1519 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1520 | nrt->rt6i_dst.plen = 128; | |
d8d1f30b | 1521 | nrt->dst.flags |= DST_HOST; |
1da177e4 LT |
1522 | |
1523 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1524 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1525 | /* Reset pmtu, it may be better */ | |
d8d1f30b CG |
1526 | nrt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); |
1527 | nrt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), | |
1528 | dst_mtu(&nrt->dst)); | |
1da177e4 | 1529 | |
40e22e8f | 1530 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1531 | goto out; |
1532 | ||
d8d1f30b CG |
1533 | netevent.old = &rt->dst; |
1534 | netevent.new = &nrt->dst; | |
8d71740c TT |
1535 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1536 | ||
1da177e4 | 1537 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1538 | ip6_del_rt(rt); |
1da177e4 LT |
1539 | return; |
1540 | } | |
1541 | ||
1542 | out: | |
d8d1f30b | 1543 | dst_release(&rt->dst); |
1da177e4 LT |
1544 | } |
1545 | ||
1546 | /* | |
1547 | * Handle ICMP "packet too big" messages | |
1548 | * i.e. Path MTU discovery | |
1549 | */ | |
1550 | ||
ae878ae2 MŻ |
1551 | static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr, |
1552 | struct net *net, u32 pmtu, int ifindex) | |
1da177e4 LT |
1553 | { |
1554 | struct rt6_info *rt, *nrt; | |
1555 | int allfrag = 0; | |
1556 | ||
ae878ae2 | 1557 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
1da177e4 LT |
1558 | if (rt == NULL) |
1559 | return; | |
1560 | ||
d8d1f30b | 1561 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1562 | goto out; |
1563 | ||
1564 | if (pmtu < IPV6_MIN_MTU) { | |
1565 | /* | |
1ab1457c | 1566 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1567 | * MTU (1280) and a fragment header should always be included |
1568 | * after a node receiving Too Big message reporting PMTU is | |
1569 | * less than the IPv6 Minimum Link MTU. | |
1570 | */ | |
1571 | pmtu = IPV6_MIN_MTU; | |
1572 | allfrag = 1; | |
1573 | } | |
1574 | ||
1575 | /* New mtu received -> path was valid. | |
1576 | They are sent only in response to data packets, | |
1577 | so that this nexthop apparently is reachable. --ANK | |
1578 | */ | |
d8d1f30b | 1579 | dst_confirm(&rt->dst); |
1da177e4 LT |
1580 | |
1581 | /* Host route. If it is static, it would be better | |
1582 | not to override it, but add new one, so that | |
1583 | when cache entry will expire old pmtu | |
1584 | would return automatically. | |
1585 | */ | |
1586 | if (rt->rt6i_flags & RTF_CACHE) { | |
d8d1f30b | 1587 | rt->dst.metrics[RTAX_MTU-1] = pmtu; |
1da177e4 | 1588 | if (allfrag) |
d8d1f30b CG |
1589 | rt->dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
1590 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1da177e4 LT |
1591 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1592 | goto out; | |
1593 | } | |
1594 | ||
1595 | /* Network route. | |
1596 | Two cases are possible: | |
1597 | 1. It is connected route. Action: COW | |
1598 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1599 | */ | |
d5315b50 | 1600 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1601 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1602 | else |
1603 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1604 | |
d5315b50 | 1605 | if (nrt) { |
d8d1f30b | 1606 | nrt->dst.metrics[RTAX_MTU-1] = pmtu; |
a1e78363 | 1607 | if (allfrag) |
d8d1f30b | 1608 | nrt->dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
a1e78363 YH |
1609 | |
1610 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1611 | * happened within 5 mins, the recommended timer is 10 mins. | |
1612 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1613 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1614 | * and detecting PMTU increase will be automatically happened. | |
1615 | */ | |
d8d1f30b | 1616 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1617 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1618 | ||
40e22e8f | 1619 | ip6_ins_rt(nrt); |
1da177e4 | 1620 | } |
1da177e4 | 1621 | out: |
d8d1f30b | 1622 | dst_release(&rt->dst); |
1da177e4 LT |
1623 | } |
1624 | ||
ae878ae2 MŻ |
1625 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, |
1626 | struct net_device *dev, u32 pmtu) | |
1627 | { | |
1628 | struct net *net = dev_net(dev); | |
1629 | ||
1630 | /* | |
1631 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1632 | * is sending along the path" that caused the Packet Too Big message. | |
1633 | * Since it's not possible in the general case to determine which | |
1634 | * interface was used to send the original packet, we update the MTU | |
1635 | * on the interface that will be used to send future packets. We also | |
1636 | * update the MTU on the interface that received the Packet Too Big in | |
1637 | * case the original packet was forced out that interface with | |
1638 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1639 | * correct behaviour, which would be to update the MTU on all | |
1640 | * interfaces. | |
1641 | */ | |
1642 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1643 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1644 | } | |
1645 | ||
1da177e4 LT |
1646 | /* |
1647 | * Misc support functions | |
1648 | */ | |
1649 | ||
1650 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1651 | { | |
c346dca1 | 1652 | struct net *net = dev_net(ort->rt6i_dev); |
86393e52 | 1653 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1654 | |
1655 | if (rt) { | |
d8d1f30b CG |
1656 | rt->dst.input = ort->dst.input; |
1657 | rt->dst.output = ort->dst.output; | |
1658 | ||
1659 | memcpy(rt->dst.metrics, ort->dst.metrics, RTAX_MAX*sizeof(u32)); | |
1660 | rt->dst.error = ort->dst.error; | |
1661 | rt->dst.dev = ort->dst.dev; | |
1662 | if (rt->dst.dev) | |
1663 | dev_hold(rt->dst.dev); | |
1da177e4 LT |
1664 | rt->rt6i_idev = ort->rt6i_idev; |
1665 | if (rt->rt6i_idev) | |
1666 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1667 | rt->dst.lastuse = jiffies; |
1da177e4 LT |
1668 | rt->rt6i_expires = 0; |
1669 | ||
1670 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1671 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1672 | rt->rt6i_metric = 0; | |
1673 | ||
1674 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1675 | #ifdef CONFIG_IPV6_SUBTREES | |
1676 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1677 | #endif | |
c71099ac | 1678 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1679 | } |
1680 | return rt; | |
1681 | } | |
1682 | ||
70ceb4f5 | 1683 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1684 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1685 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1686 | struct in6_addr *gwaddr, int ifindex) |
1687 | { | |
1688 | struct fib6_node *fn; | |
1689 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1690 | struct fib6_table *table; |
1691 | ||
efa2cea0 | 1692 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1693 | if (table == NULL) |
1694 | return NULL; | |
70ceb4f5 | 1695 | |
c71099ac TG |
1696 | write_lock_bh(&table->tb6_lock); |
1697 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1698 | if (!fn) |
1699 | goto out; | |
1700 | ||
d8d1f30b | 1701 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
70ceb4f5 YH |
1702 | if (rt->rt6i_dev->ifindex != ifindex) |
1703 | continue; | |
1704 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1705 | continue; | |
1706 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1707 | continue; | |
d8d1f30b | 1708 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1709 | break; |
1710 | } | |
1711 | out: | |
c71099ac | 1712 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1713 | return rt; |
1714 | } | |
1715 | ||
efa2cea0 DL |
1716 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1717 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1718 | struct in6_addr *gwaddr, int ifindex, |
1719 | unsigned pref) | |
1720 | { | |
86872cb5 TG |
1721 | struct fib6_config cfg = { |
1722 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1723 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1724 | .fc_ifindex = ifindex, |
1725 | .fc_dst_len = prefixlen, | |
1726 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1727 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1728 | .fc_nlinfo.pid = 0, |
1729 | .fc_nlinfo.nlh = NULL, | |
1730 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1731 | }; |
1732 | ||
1733 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1734 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1735 | |
e317da96 YH |
1736 | /* We should treat it as a default route if prefix length is 0. */ |
1737 | if (!prefixlen) | |
86872cb5 | 1738 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1739 | |
86872cb5 | 1740 | ip6_route_add(&cfg); |
70ceb4f5 | 1741 | |
efa2cea0 | 1742 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1743 | } |
1744 | #endif | |
1745 | ||
1da177e4 | 1746 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1747 | { |
1da177e4 | 1748 | struct rt6_info *rt; |
c71099ac | 1749 | struct fib6_table *table; |
1da177e4 | 1750 | |
c346dca1 | 1751 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1752 | if (table == NULL) |
1753 | return NULL; | |
1da177e4 | 1754 | |
c71099ac | 1755 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1756 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
1da177e4 | 1757 | if (dev == rt->rt6i_dev && |
045927ff | 1758 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1759 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1760 | break; | |
1761 | } | |
1762 | if (rt) | |
d8d1f30b | 1763 | dst_hold(&rt->dst); |
c71099ac | 1764 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1765 | return rt; |
1766 | } | |
1767 | ||
1768 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1769 | struct net_device *dev, |
1770 | unsigned int pref) | |
1da177e4 | 1771 | { |
86872cb5 TG |
1772 | struct fib6_config cfg = { |
1773 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1774 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1775 | .fc_ifindex = dev->ifindex, |
1776 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1777 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1778 | .fc_nlinfo.pid = 0, |
1779 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1780 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1781 | }; |
1da177e4 | 1782 | |
86872cb5 | 1783 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1784 | |
86872cb5 | 1785 | ip6_route_add(&cfg); |
1da177e4 | 1786 | |
1da177e4 LT |
1787 | return rt6_get_dflt_router(gwaddr, dev); |
1788 | } | |
1789 | ||
7b4da532 | 1790 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1791 | { |
1792 | struct rt6_info *rt; | |
c71099ac TG |
1793 | struct fib6_table *table; |
1794 | ||
1795 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1796 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1797 | if (table == NULL) |
1798 | return; | |
1da177e4 LT |
1799 | |
1800 | restart: | |
c71099ac | 1801 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1802 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1803 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1804 | dst_hold(&rt->dst); |
c71099ac | 1805 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1806 | ip6_del_rt(rt); |
1da177e4 LT |
1807 | goto restart; |
1808 | } | |
1809 | } | |
c71099ac | 1810 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1811 | } |
1812 | ||
5578689a DL |
1813 | static void rtmsg_to_fib6_config(struct net *net, |
1814 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1815 | struct fib6_config *cfg) |
1816 | { | |
1817 | memset(cfg, 0, sizeof(*cfg)); | |
1818 | ||
1819 | cfg->fc_table = RT6_TABLE_MAIN; | |
1820 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1821 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1822 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1823 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1824 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1825 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1826 | ||
5578689a | 1827 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1828 | |
86872cb5 TG |
1829 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1830 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1831 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1832 | } | |
1833 | ||
5578689a | 1834 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1835 | { |
86872cb5 | 1836 | struct fib6_config cfg; |
1da177e4 LT |
1837 | struct in6_rtmsg rtmsg; |
1838 | int err; | |
1839 | ||
1840 | switch(cmd) { | |
1841 | case SIOCADDRT: /* Add a route */ | |
1842 | case SIOCDELRT: /* Delete a route */ | |
1843 | if (!capable(CAP_NET_ADMIN)) | |
1844 | return -EPERM; | |
1845 | err = copy_from_user(&rtmsg, arg, | |
1846 | sizeof(struct in6_rtmsg)); | |
1847 | if (err) | |
1848 | return -EFAULT; | |
86872cb5 | 1849 | |
5578689a | 1850 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1851 | |
1da177e4 LT |
1852 | rtnl_lock(); |
1853 | switch (cmd) { | |
1854 | case SIOCADDRT: | |
86872cb5 | 1855 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1856 | break; |
1857 | case SIOCDELRT: | |
86872cb5 | 1858 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1859 | break; |
1860 | default: | |
1861 | err = -EINVAL; | |
1862 | } | |
1863 | rtnl_unlock(); | |
1864 | ||
1865 | return err; | |
3ff50b79 | 1866 | } |
1da177e4 LT |
1867 | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * Drop the packet on the floor | |
1873 | */ | |
1874 | ||
d5fdd6ba | 1875 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1876 | { |
612f09e8 | 1877 | int type; |
adf30907 | 1878 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1879 | switch (ipstats_mib_noroutes) { |
1880 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1881 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1882 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
1883 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1884 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1885 | break; |
1886 | } | |
1887 | /* FALLTHROUGH */ | |
1888 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1889 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1890 | ipstats_mib_noroutes); | |
612f09e8 YH |
1891 | break; |
1892 | } | |
3ffe533c | 1893 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
1894 | kfree_skb(skb); |
1895 | return 0; | |
1896 | } | |
1897 | ||
9ce8ade0 TG |
1898 | static int ip6_pkt_discard(struct sk_buff *skb) |
1899 | { | |
612f09e8 | 1900 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1901 | } |
1902 | ||
20380731 | 1903 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 1904 | { |
adf30907 | 1905 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1906 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1907 | } |
1908 | ||
6723ab54 DM |
1909 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1910 | ||
9ce8ade0 TG |
1911 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1912 | { | |
612f09e8 | 1913 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1914 | } |
1915 | ||
1916 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1917 | { | |
adf30907 | 1918 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1919 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1920 | } |
1921 | ||
6723ab54 DM |
1922 | #endif |
1923 | ||
1da177e4 LT |
1924 | /* |
1925 | * Allocate a dst for local (unicast / anycast) address. | |
1926 | */ | |
1927 | ||
1928 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1929 | const struct in6_addr *addr, | |
1930 | int anycast) | |
1931 | { | |
c346dca1 | 1932 | struct net *net = dev_net(idev->dev); |
86393e52 | 1933 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
14deae41 | 1934 | struct neighbour *neigh; |
1da177e4 | 1935 | |
40385653 BG |
1936 | if (rt == NULL) { |
1937 | if (net_ratelimit()) | |
1938 | pr_warning("IPv6: Maximum number of routes reached," | |
1939 | " consider increasing route/max_size.\n"); | |
1da177e4 | 1940 | return ERR_PTR(-ENOMEM); |
40385653 | 1941 | } |
1da177e4 | 1942 | |
5578689a | 1943 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1944 | in6_dev_hold(idev); |
1945 | ||
d8d1f30b CG |
1946 | rt->dst.flags = DST_HOST; |
1947 | rt->dst.input = ip6_input; | |
1948 | rt->dst.output = ip6_output; | |
5578689a | 1949 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 | 1950 | rt->rt6i_idev = idev; |
d8d1f30b CG |
1951 | rt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); |
1952 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->dst)); | |
1953 | rt->dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1954 | rt->dst.obsolete = -1; | |
1da177e4 LT |
1955 | |
1956 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1957 | if (anycast) |
1958 | rt->rt6i_flags |= RTF_ANYCAST; | |
1959 | else | |
1da177e4 | 1960 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
1961 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
1962 | if (IS_ERR(neigh)) { | |
d8d1f30b | 1963 | dst_free(&rt->dst); |
14deae41 DM |
1964 | |
1965 | /* We are casting this because that is the return | |
1966 | * value type. But an errno encoded pointer is the | |
1967 | * same regardless of the underlying pointer type, | |
1968 | * and that's what we are returning. So this is OK. | |
1969 | */ | |
1970 | return (struct rt6_info *) neigh; | |
1da177e4 | 1971 | } |
14deae41 | 1972 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
1973 | |
1974 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1975 | rt->rt6i_dst.plen = 128; | |
5578689a | 1976 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 1977 | |
d8d1f30b | 1978 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
1979 | |
1980 | return rt; | |
1981 | } | |
1982 | ||
8ed67789 DL |
1983 | struct arg_dev_net { |
1984 | struct net_device *dev; | |
1985 | struct net *net; | |
1986 | }; | |
1987 | ||
1da177e4 LT |
1988 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1989 | { | |
8ed67789 DL |
1990 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1991 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1992 | ||
1993 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1994 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1995 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1996 | return -1; | |
1997 | } | |
1998 | return 0; | |
1999 | } | |
2000 | ||
f3db4851 | 2001 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2002 | { |
8ed67789 DL |
2003 | struct arg_dev_net adn = { |
2004 | .dev = dev, | |
2005 | .net = net, | |
2006 | }; | |
2007 | ||
2008 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2009 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2010 | } |
2011 | ||
2012 | struct rt6_mtu_change_arg | |
2013 | { | |
2014 | struct net_device *dev; | |
2015 | unsigned mtu; | |
2016 | }; | |
2017 | ||
2018 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2019 | { | |
2020 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2021 | struct inet6_dev *idev; | |
c346dca1 | 2022 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
2023 | |
2024 | /* In IPv6 pmtu discovery is not optional, | |
2025 | so that RTAX_MTU lock cannot disable it. | |
2026 | We still use this lock to block changes | |
2027 | caused by addrconf/ndisc. | |
2028 | */ | |
2029 | ||
2030 | idev = __in6_dev_get(arg->dev); | |
2031 | if (idev == NULL) | |
2032 | return 0; | |
2033 | ||
2034 | /* For administrative MTU increase, there is no way to discover | |
2035 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2036 | Since RFC 1981 doesn't include administrative MTU increase | |
2037 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2038 | */ | |
2039 | /* | |
2040 | If new MTU is less than route PMTU, this new MTU will be the | |
2041 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2042 | decreases; if new MTU is greater than route PMTU, and the | |
2043 | old MTU is the lowest MTU in the path, update the route PMTU | |
2044 | to reflect the increase. In this case if the other nodes' MTU | |
2045 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2046 | PMTU discouvery. | |
2047 | */ | |
2048 | if (rt->rt6i_dev == arg->dev && | |
d8d1f30b CG |
2049 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2050 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2051 | (dst_mtu(&rt->dst) < arg->mtu && | |
2052 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
2053 | rt->dst.metrics[RTAX_MTU-1] = arg->mtu; | |
2054 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); | |
566cfd8f | 2055 | } |
1da177e4 LT |
2056 | return 0; |
2057 | } | |
2058 | ||
2059 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2060 | { | |
c71099ac TG |
2061 | struct rt6_mtu_change_arg arg = { |
2062 | .dev = dev, | |
2063 | .mtu = mtu, | |
2064 | }; | |
1da177e4 | 2065 | |
c346dca1 | 2066 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2067 | } |
2068 | ||
ef7c79ed | 2069 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2070 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2071 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2072 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2073 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2074 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2075 | }; | |
2076 | ||
2077 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2078 | struct fib6_config *cfg) | |
1da177e4 | 2079 | { |
86872cb5 TG |
2080 | struct rtmsg *rtm; |
2081 | struct nlattr *tb[RTA_MAX+1]; | |
2082 | int err; | |
1da177e4 | 2083 | |
86872cb5 TG |
2084 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2085 | if (err < 0) | |
2086 | goto errout; | |
1da177e4 | 2087 | |
86872cb5 TG |
2088 | err = -EINVAL; |
2089 | rtm = nlmsg_data(nlh); | |
2090 | memset(cfg, 0, sizeof(*cfg)); | |
2091 | ||
2092 | cfg->fc_table = rtm->rtm_table; | |
2093 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2094 | cfg->fc_src_len = rtm->rtm_src_len; | |
2095 | cfg->fc_flags = RTF_UP; | |
2096 | cfg->fc_protocol = rtm->rtm_protocol; | |
2097 | ||
2098 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2099 | cfg->fc_flags |= RTF_REJECT; | |
2100 | ||
ab79ad14 MŻ |
2101 | if (rtm->rtm_type == RTN_LOCAL) |
2102 | cfg->fc_flags |= RTF_LOCAL; | |
2103 | ||
86872cb5 TG |
2104 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2105 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2106 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2107 | |
2108 | if (tb[RTA_GATEWAY]) { | |
2109 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2110 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2111 | } |
86872cb5 TG |
2112 | |
2113 | if (tb[RTA_DST]) { | |
2114 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2115 | ||
2116 | if (nla_len(tb[RTA_DST]) < plen) | |
2117 | goto errout; | |
2118 | ||
2119 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2120 | } |
86872cb5 TG |
2121 | |
2122 | if (tb[RTA_SRC]) { | |
2123 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2124 | ||
2125 | if (nla_len(tb[RTA_SRC]) < plen) | |
2126 | goto errout; | |
2127 | ||
2128 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2129 | } |
86872cb5 TG |
2130 | |
2131 | if (tb[RTA_OIF]) | |
2132 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2133 | ||
2134 | if (tb[RTA_PRIORITY]) | |
2135 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2136 | ||
2137 | if (tb[RTA_METRICS]) { | |
2138 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2139 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2140 | } |
86872cb5 TG |
2141 | |
2142 | if (tb[RTA_TABLE]) | |
2143 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2144 | ||
2145 | err = 0; | |
2146 | errout: | |
2147 | return err; | |
1da177e4 LT |
2148 | } |
2149 | ||
c127ea2c | 2150 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2151 | { |
86872cb5 TG |
2152 | struct fib6_config cfg; |
2153 | int err; | |
1da177e4 | 2154 | |
86872cb5 TG |
2155 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2156 | if (err < 0) | |
2157 | return err; | |
2158 | ||
2159 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2160 | } |
2161 | ||
c127ea2c | 2162 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2163 | { |
86872cb5 TG |
2164 | struct fib6_config cfg; |
2165 | int err; | |
1da177e4 | 2166 | |
86872cb5 TG |
2167 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2168 | if (err < 0) | |
2169 | return err; | |
2170 | ||
2171 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2172 | } |
2173 | ||
339bf98f TG |
2174 | static inline size_t rt6_nlmsg_size(void) |
2175 | { | |
2176 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2177 | + nla_total_size(16) /* RTA_SRC */ | |
2178 | + nla_total_size(16) /* RTA_DST */ | |
2179 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2180 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2181 | + nla_total_size(4) /* RTA_TABLE */ | |
2182 | + nla_total_size(4) /* RTA_IIF */ | |
2183 | + nla_total_size(4) /* RTA_OIF */ | |
2184 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2185 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2186 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2187 | } | |
2188 | ||
191cd582 BH |
2189 | static int rt6_fill_node(struct net *net, |
2190 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2191 | struct in6_addr *dst, struct in6_addr *src, |
2192 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2193 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2194 | { |
2195 | struct rtmsg *rtm; | |
2d7202bf | 2196 | struct nlmsghdr *nlh; |
e3703b3d | 2197 | long expires; |
9e762a4a | 2198 | u32 table; |
1da177e4 LT |
2199 | |
2200 | if (prefix) { /* user wants prefix routes only */ | |
2201 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2202 | /* success since this is not a prefix route */ | |
2203 | return 1; | |
2204 | } | |
2205 | } | |
2206 | ||
2d7202bf TG |
2207 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2208 | if (nlh == NULL) | |
26932566 | 2209 | return -EMSGSIZE; |
2d7202bf TG |
2210 | |
2211 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2212 | rtm->rtm_family = AF_INET6; |
2213 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2214 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2215 | rtm->rtm_tos = 0; | |
c71099ac | 2216 | if (rt->rt6i_table) |
9e762a4a | 2217 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2218 | else |
9e762a4a PM |
2219 | table = RT6_TABLE_UNSPEC; |
2220 | rtm->rtm_table = table; | |
2d7202bf | 2221 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2222 | if (rt->rt6i_flags&RTF_REJECT) |
2223 | rtm->rtm_type = RTN_UNREACHABLE; | |
ab79ad14 MŻ |
2224 | else if (rt->rt6i_flags&RTF_LOCAL) |
2225 | rtm->rtm_type = RTN_LOCAL; | |
1da177e4 LT |
2226 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) |
2227 | rtm->rtm_type = RTN_LOCAL; | |
2228 | else | |
2229 | rtm->rtm_type = RTN_UNICAST; | |
2230 | rtm->rtm_flags = 0; | |
2231 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2232 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2233 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2234 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2235 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2236 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2237 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2238 | rtm->rtm_protocol = RTPROT_RA; | |
2239 | ||
2240 | if (rt->rt6i_flags&RTF_CACHE) | |
2241 | rtm->rtm_flags |= RTM_F_CLONED; | |
2242 | ||
2243 | if (dst) { | |
2d7202bf | 2244 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2245 | rtm->rtm_dst_len = 128; |
1da177e4 | 2246 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2247 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2248 | #ifdef CONFIG_IPV6_SUBTREES |
2249 | if (src) { | |
2d7202bf | 2250 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2251 | rtm->rtm_src_len = 128; |
1da177e4 | 2252 | } else if (rtm->rtm_src_len) |
2d7202bf | 2253 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2254 | #endif |
7bc570c8 YH |
2255 | if (iif) { |
2256 | #ifdef CONFIG_IPV6_MROUTE | |
2257 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2258 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2259 | if (err <= 0) { |
2260 | if (!nowait) { | |
2261 | if (err == 0) | |
2262 | return 0; | |
2263 | goto nla_put_failure; | |
2264 | } else { | |
2265 | if (err == -EMSGSIZE) | |
2266 | goto nla_put_failure; | |
2267 | } | |
2268 | } | |
2269 | } else | |
2270 | #endif | |
2271 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2272 | } else if (dst) { | |
d8d1f30b | 2273 | struct inet6_dev *idev = ip6_dst_idev(&rt->dst); |
1da177e4 | 2274 | struct in6_addr saddr_buf; |
191cd582 | 2275 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2276 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2277 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2278 | } |
2d7202bf | 2279 | |
d8d1f30b | 2280 | if (rtnetlink_put_metrics(skb, rt->dst.metrics) < 0) |
2d7202bf TG |
2281 | goto nla_put_failure; |
2282 | ||
d8d1f30b CG |
2283 | if (rt->dst.neighbour) |
2284 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->dst.neighbour->primary_key); | |
2d7202bf | 2285 | |
d8d1f30b | 2286 | if (rt->dst.dev) |
2d7202bf TG |
2287 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2288 | ||
2289 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2290 | |
36e3deae YH |
2291 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2292 | expires = 0; | |
2293 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2294 | expires = rt->rt6i_expires - jiffies; | |
2295 | else | |
2296 | expires = INT_MAX; | |
69cdf8f9 | 2297 | |
d8d1f30b CG |
2298 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2299 | expires, rt->dst.error) < 0) | |
e3703b3d | 2300 | goto nla_put_failure; |
2d7202bf TG |
2301 | |
2302 | return nlmsg_end(skb, nlh); | |
2303 | ||
2304 | nla_put_failure: | |
26932566 PM |
2305 | nlmsg_cancel(skb, nlh); |
2306 | return -EMSGSIZE; | |
1da177e4 LT |
2307 | } |
2308 | ||
1b43af54 | 2309 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2310 | { |
2311 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2312 | int prefix; | |
2313 | ||
2d7202bf TG |
2314 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2315 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2316 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2317 | } else | |
2318 | prefix = 0; | |
2319 | ||
191cd582 BH |
2320 | return rt6_fill_node(arg->net, |
2321 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2322 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2323 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2324 | } |
2325 | ||
c127ea2c | 2326 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2327 | { |
3b1e0a65 | 2328 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2329 | struct nlattr *tb[RTA_MAX+1]; |
2330 | struct rt6_info *rt; | |
1da177e4 | 2331 | struct sk_buff *skb; |
ab364a6f | 2332 | struct rtmsg *rtm; |
1da177e4 | 2333 | struct flowi fl; |
ab364a6f | 2334 | int err, iif = 0; |
1da177e4 | 2335 | |
ab364a6f TG |
2336 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2337 | if (err < 0) | |
2338 | goto errout; | |
1da177e4 | 2339 | |
ab364a6f | 2340 | err = -EINVAL; |
1da177e4 | 2341 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2342 | |
ab364a6f TG |
2343 | if (tb[RTA_SRC]) { |
2344 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2345 | goto errout; | |
2346 | ||
2347 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2348 | } | |
2349 | ||
2350 | if (tb[RTA_DST]) { | |
2351 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2352 | goto errout; | |
2353 | ||
2354 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2355 | } | |
2356 | ||
2357 | if (tb[RTA_IIF]) | |
2358 | iif = nla_get_u32(tb[RTA_IIF]); | |
2359 | ||
2360 | if (tb[RTA_OIF]) | |
2361 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2362 | |
2363 | if (iif) { | |
2364 | struct net_device *dev; | |
5578689a | 2365 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2366 | if (!dev) { |
2367 | err = -ENODEV; | |
ab364a6f | 2368 | goto errout; |
1da177e4 LT |
2369 | } |
2370 | } | |
2371 | ||
ab364a6f TG |
2372 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2373 | if (skb == NULL) { | |
2374 | err = -ENOBUFS; | |
2375 | goto errout; | |
2376 | } | |
1da177e4 | 2377 | |
ab364a6f TG |
2378 | /* Reserve room for dummy headers, this skb can pass |
2379 | through good chunk of routing engine. | |
2380 | */ | |
459a98ed | 2381 | skb_reset_mac_header(skb); |
ab364a6f | 2382 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2383 | |
8a3edd80 | 2384 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
d8d1f30b | 2385 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2386 | |
191cd582 | 2387 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2388 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2389 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2390 | if (err < 0) { |
ab364a6f TG |
2391 | kfree_skb(skb); |
2392 | goto errout; | |
1da177e4 LT |
2393 | } |
2394 | ||
5578689a | 2395 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2396 | errout: |
1da177e4 | 2397 | return err; |
1da177e4 LT |
2398 | } |
2399 | ||
86872cb5 | 2400 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2401 | { |
2402 | struct sk_buff *skb; | |
5578689a | 2403 | struct net *net = info->nl_net; |
528c4ceb DL |
2404 | u32 seq; |
2405 | int err; | |
2406 | ||
2407 | err = -ENOBUFS; | |
2408 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2409 | |
339bf98f | 2410 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2411 | if (skb == NULL) |
2412 | goto errout; | |
2413 | ||
191cd582 | 2414 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2415 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2416 | if (err < 0) { |
2417 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2418 | WARN_ON(err == -EMSGSIZE); | |
2419 | kfree_skb(skb); | |
2420 | goto errout; | |
2421 | } | |
1ce85fe4 PNA |
2422 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2423 | info->nlh, gfp_any()); | |
2424 | return; | |
21713ebc TG |
2425 | errout: |
2426 | if (err < 0) | |
5578689a | 2427 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2428 | } |
2429 | ||
8ed67789 DL |
2430 | static int ip6_route_dev_notify(struct notifier_block *this, |
2431 | unsigned long event, void *data) | |
2432 | { | |
2433 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2434 | struct net *net = dev_net(dev); |
8ed67789 DL |
2435 | |
2436 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2437 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2438 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2439 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2440 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2441 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2442 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2443 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2444 | #endif | |
2445 | } | |
2446 | ||
2447 | return NOTIFY_OK; | |
2448 | } | |
2449 | ||
1da177e4 LT |
2450 | /* |
2451 | * /proc | |
2452 | */ | |
2453 | ||
2454 | #ifdef CONFIG_PROC_FS | |
2455 | ||
2456 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2457 | ||
2458 | struct rt6_proc_arg | |
2459 | { | |
2460 | char *buffer; | |
2461 | int offset; | |
2462 | int length; | |
2463 | int skip; | |
2464 | int len; | |
2465 | }; | |
2466 | ||
2467 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2468 | { | |
33120b30 | 2469 | struct seq_file *m = p_arg; |
1da177e4 | 2470 | |
4b7a4274 | 2471 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2472 | |
2473 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2474 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2475 | #else |
33120b30 | 2476 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2477 | #endif |
2478 | ||
2479 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2480 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2481 | } else { |
33120b30 | 2482 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2483 | } |
33120b30 | 2484 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2485 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2486 | rt->dst.__use, rt->rt6i_flags, | |
33120b30 | 2487 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
1da177e4 LT |
2488 | return 0; |
2489 | } | |
2490 | ||
33120b30 | 2491 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2492 | { |
f3db4851 DL |
2493 | struct net *net = (struct net *)m->private; |
2494 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2495 | return 0; |
2496 | } | |
1da177e4 | 2497 | |
33120b30 AD |
2498 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2499 | { | |
de05c557 | 2500 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2501 | } |
2502 | ||
33120b30 AD |
2503 | static const struct file_operations ipv6_route_proc_fops = { |
2504 | .owner = THIS_MODULE, | |
2505 | .open = ipv6_route_open, | |
2506 | .read = seq_read, | |
2507 | .llseek = seq_lseek, | |
b6fcbdb4 | 2508 | .release = single_release_net, |
33120b30 AD |
2509 | }; |
2510 | ||
1da177e4 LT |
2511 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2512 | { | |
69ddb805 | 2513 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2514 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2515 | net->ipv6.rt6_stats->fib_nodes, |
2516 | net->ipv6.rt6_stats->fib_route_nodes, | |
2517 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2518 | net->ipv6.rt6_stats->fib_rt_entries, | |
2519 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2520 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2521 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2522 | |
2523 | return 0; | |
2524 | } | |
2525 | ||
2526 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2527 | { | |
de05c557 | 2528 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2529 | } |
2530 | ||
9a32144e | 2531 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2532 | .owner = THIS_MODULE, |
2533 | .open = rt6_stats_seq_open, | |
2534 | .read = seq_read, | |
2535 | .llseek = seq_lseek, | |
b6fcbdb4 | 2536 | .release = single_release_net, |
1da177e4 LT |
2537 | }; |
2538 | #endif /* CONFIG_PROC_FS */ | |
2539 | ||
2540 | #ifdef CONFIG_SYSCTL | |
2541 | ||
1da177e4 | 2542 | static |
8d65af78 | 2543 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2544 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2545 | { | |
5b7c931d DL |
2546 | struct net *net = current->nsproxy->net_ns; |
2547 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 | 2548 | if (write) { |
8d65af78 | 2549 | proc_dointvec(ctl, write, buffer, lenp, ppos); |
5b7c931d | 2550 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2551 | return 0; |
2552 | } else | |
2553 | return -EINVAL; | |
2554 | } | |
2555 | ||
760f2d01 | 2556 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2557 | { |
1da177e4 | 2558 | .procname = "flush", |
4990509f | 2559 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2560 | .maxlen = sizeof(int), |
89c8b3a1 | 2561 | .mode = 0200, |
6d9f239a | 2562 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2563 | }, |
2564 | { | |
1da177e4 | 2565 | .procname = "gc_thresh", |
9a7ec3a9 | 2566 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2567 | .maxlen = sizeof(int), |
2568 | .mode = 0644, | |
6d9f239a | 2569 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2570 | }, |
2571 | { | |
1da177e4 | 2572 | .procname = "max_size", |
4990509f | 2573 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2574 | .maxlen = sizeof(int), |
2575 | .mode = 0644, | |
6d9f239a | 2576 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2577 | }, |
2578 | { | |
1da177e4 | 2579 | .procname = "gc_min_interval", |
4990509f | 2580 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2581 | .maxlen = sizeof(int), |
2582 | .mode = 0644, | |
6d9f239a | 2583 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2584 | }, |
2585 | { | |
1da177e4 | 2586 | .procname = "gc_timeout", |
4990509f | 2587 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2588 | .maxlen = sizeof(int), |
2589 | .mode = 0644, | |
6d9f239a | 2590 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2591 | }, |
2592 | { | |
1da177e4 | 2593 | .procname = "gc_interval", |
4990509f | 2594 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2595 | .maxlen = sizeof(int), |
2596 | .mode = 0644, | |
6d9f239a | 2597 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2598 | }, |
2599 | { | |
1da177e4 | 2600 | .procname = "gc_elasticity", |
4990509f | 2601 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2602 | .maxlen = sizeof(int), |
2603 | .mode = 0644, | |
f3d3f616 | 2604 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2605 | }, |
2606 | { | |
1da177e4 | 2607 | .procname = "mtu_expires", |
4990509f | 2608 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2609 | .maxlen = sizeof(int), |
2610 | .mode = 0644, | |
6d9f239a | 2611 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2612 | }, |
2613 | { | |
1da177e4 | 2614 | .procname = "min_adv_mss", |
4990509f | 2615 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2616 | .maxlen = sizeof(int), |
2617 | .mode = 0644, | |
f3d3f616 | 2618 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2619 | }, |
2620 | { | |
1da177e4 | 2621 | .procname = "gc_min_interval_ms", |
4990509f | 2622 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2623 | .maxlen = sizeof(int), |
2624 | .mode = 0644, | |
6d9f239a | 2625 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2626 | }, |
f8572d8f | 2627 | { } |
1da177e4 LT |
2628 | }; |
2629 | ||
2c8c1e72 | 2630 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
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; | |
86393e52 | 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; | |
9c69fabe | 2648 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2649 | } |
2650 | ||
760f2d01 DL |
2651 | return table; |
2652 | } | |
1da177e4 LT |
2653 | #endif |
2654 | ||
2c8c1e72 | 2655 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2656 | { |
633d424b | 2657 | int ret = -ENOMEM; |
8ed67789 | 2658 | |
86393e52 AD |
2659 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2660 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2661 | |
fc66f95c ED |
2662 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2663 | goto out_ip6_dst_ops; | |
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) | |
fc66f95c | 2669 | goto out_ip6_dst_entries; |
d8d1f30b | 2670 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2671 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2672 | net->ipv6.ip6_null_entry->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; | |
d8d1f30b | 2680 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2681 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2682 | net->ipv6.ip6_prohibit_entry->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; | |
d8d1f30b | 2689 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2690 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2691 | net->ipv6.ip6_blk_hole_entry->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 | |
fc66f95c ED |
2719 | out_ip6_dst_entries: |
2720 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2721 | out_ip6_dst_ops: |
f2fc6a54 | 2722 | goto out; |
cdb18761 DL |
2723 | } |
2724 | ||
2c8c1e72 | 2725 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
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 | |
41bb78b4 | 2736 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2737 | } |
2738 | ||
2739 | static struct pernet_operations ip6_route_net_ops = { | |
2740 | .init = ip6_route_net_init, | |
2741 | .exit = ip6_route_net_exit, | |
2742 | }; | |
2743 | ||
8ed67789 DL |
2744 | static struct notifier_block ip6_route_dev_notifier = { |
2745 | .notifier_call = ip6_route_dev_notify, | |
2746 | .priority = 0, | |
2747 | }; | |
2748 | ||
433d49c3 | 2749 | int __init ip6_route_init(void) |
1da177e4 | 2750 | { |
433d49c3 DL |
2751 | int ret; |
2752 | ||
9a7ec3a9 DL |
2753 | ret = -ENOMEM; |
2754 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2755 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2756 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2757 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2758 | goto out; |
14e50e57 | 2759 | |
fc66f95c | 2760 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2761 | if (ret) |
bdb3289f | 2762 | goto out_kmem_cache; |
bdb3289f | 2763 | |
fc66f95c ED |
2764 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2765 | if (ret) | |
2766 | goto out_dst_entries; | |
2767 | ||
5dc121e9 AE |
2768 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2769 | ||
8ed67789 DL |
2770 | /* Registering of the loopback is done before this portion of code, |
2771 | * the loopback reference in rt6_info will not be taken, do it | |
2772 | * manually for init_net */ | |
d8d1f30b | 2773 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2774 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2775 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2776 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2777 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2778 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2779 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2780 | #endif | |
433d49c3 DL |
2781 | ret = fib6_init(); |
2782 | if (ret) | |
8ed67789 | 2783 | goto out_register_subsys; |
433d49c3 | 2784 | |
433d49c3 DL |
2785 | ret = xfrm6_init(); |
2786 | if (ret) | |
cdb18761 | 2787 | goto out_fib6_init; |
c35b7e72 | 2788 | |
433d49c3 DL |
2789 | ret = fib6_rules_init(); |
2790 | if (ret) | |
2791 | goto xfrm6_init; | |
7e5449c2 | 2792 | |
433d49c3 DL |
2793 | ret = -ENOBUFS; |
2794 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2795 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2796 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2797 | goto fib6_rules_init; | |
c127ea2c | 2798 | |
8ed67789 | 2799 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2800 | if (ret) |
2801 | goto fib6_rules_init; | |
8ed67789 | 2802 | |
433d49c3 DL |
2803 | out: |
2804 | return ret; | |
2805 | ||
2806 | fib6_rules_init: | |
433d49c3 DL |
2807 | fib6_rules_cleanup(); |
2808 | xfrm6_init: | |
433d49c3 | 2809 | xfrm6_fini(); |
433d49c3 | 2810 | out_fib6_init: |
433d49c3 | 2811 | fib6_gc_cleanup(); |
8ed67789 DL |
2812 | out_register_subsys: |
2813 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
2814 | out_dst_entries: |
2815 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 2816 | out_kmem_cache: |
f2fc6a54 | 2817 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2818 | goto out; |
1da177e4 LT |
2819 | } |
2820 | ||
2821 | void ip6_route_cleanup(void) | |
2822 | { | |
8ed67789 | 2823 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2824 | fib6_rules_cleanup(); |
1da177e4 | 2825 | xfrm6_fini(); |
1da177e4 | 2826 | fib6_gc_cleanup(); |
8ed67789 | 2827 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 2828 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 2829 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2830 | } |