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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 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 | 40 | #include <linux/if_arp.h> |
1da177e4 LT |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> | |
5b7c931d | 43 | #include <linux/nsproxy.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 | ||
1da177e4 LT |
100 | static struct dst_ops ip6_dst_ops = { |
101 | .family = AF_INET6, | |
102 | .protocol = __constant_htons(ETH_P_IPV6), | |
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, | |
862b82c6 | 111 | .local_out = ip6_local_out, |
1da177e4 | 112 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 113 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
114 | }; |
115 | ||
14e50e57 DM |
116 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
117 | { | |
118 | } | |
119 | ||
120 | static struct dst_ops ip6_dst_blackhole_ops = { | |
121 | .family = AF_INET6, | |
122 | .protocol = __constant_htons(ETH_P_IPV6), | |
123 | .destroy = ip6_dst_destroy, | |
124 | .check = ip6_dst_check, | |
125 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
126 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 127 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
128 | }; |
129 | ||
bdb3289f | 130 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
131 | .u = { |
132 | .dst = { | |
133 | .__refcnt = ATOMIC_INIT(1), | |
134 | .__use = 1, | |
1da177e4 LT |
135 | .obsolete = -1, |
136 | .error = -ENETUNREACH, | |
137 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
138 | .input = ip6_pkt_discard, | |
139 | .output = ip6_pkt_discard_out, | |
140 | .ops = &ip6_dst_ops, | |
1da177e4 LT |
141 | } |
142 | }, | |
143 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
144 | .rt6i_metric = ~(u32) 0, | |
145 | .rt6i_ref = ATOMIC_INIT(1), | |
146 | }; | |
147 | ||
bdb3289f DL |
148 | struct rt6_info *ip6_null_entry; |
149 | ||
101367c2 TG |
150 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
151 | ||
6723ab54 DM |
152 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
153 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 154 | |
bdb3289f | 155 | struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
156 | .u = { |
157 | .dst = { | |
158 | .__refcnt = ATOMIC_INIT(1), | |
159 | .__use = 1, | |
101367c2 TG |
160 | .obsolete = -1, |
161 | .error = -EACCES, | |
162 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
163 | .input = ip6_pkt_prohibit, |
164 | .output = ip6_pkt_prohibit_out, | |
101367c2 | 165 | .ops = &ip6_dst_ops, |
101367c2 TG |
166 | } |
167 | }, | |
168 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
169 | .rt6i_metric = ~(u32) 0, | |
170 | .rt6i_ref = ATOMIC_INIT(1), | |
171 | }; | |
172 | ||
bdb3289f DL |
173 | struct rt6_info *ip6_prohibit_entry; |
174 | ||
175 | static struct rt6_info ip6_blk_hole_entry_template = { | |
101367c2 TG |
176 | .u = { |
177 | .dst = { | |
178 | .__refcnt = ATOMIC_INIT(1), | |
179 | .__use = 1, | |
101367c2 TG |
180 | .obsolete = -1, |
181 | .error = -EINVAL, | |
182 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
183 | .input = dst_discard, |
184 | .output = dst_discard, | |
101367c2 | 185 | .ops = &ip6_dst_ops, |
101367c2 TG |
186 | } |
187 | }, | |
188 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
189 | .rt6i_metric = ~(u32) 0, | |
190 | .rt6i_ref = ATOMIC_INIT(1), | |
191 | }; | |
192 | ||
bdb3289f DL |
193 | struct rt6_info *ip6_blk_hole_entry; |
194 | ||
101367c2 TG |
195 | #endif |
196 | ||
1da177e4 LT |
197 | /* allocate dst with ip6_dst_ops */ |
198 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
199 | { | |
200 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
201 | } | |
202 | ||
203 | static void ip6_dst_destroy(struct dst_entry *dst) | |
204 | { | |
205 | struct rt6_info *rt = (struct rt6_info *)dst; | |
206 | struct inet6_dev *idev = rt->rt6i_idev; | |
207 | ||
208 | if (idev != NULL) { | |
209 | rt->rt6i_idev = NULL; | |
210 | in6_dev_put(idev); | |
1ab1457c | 211 | } |
1da177e4 LT |
212 | } |
213 | ||
214 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
215 | int how) | |
216 | { | |
217 | struct rt6_info *rt = (struct rt6_info *)dst; | |
218 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
219 | struct net_device *loopback_dev = |
220 | dev->nd_net->loopback_dev; | |
1da177e4 | 221 | |
5a3e55d6 DL |
222 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
223 | struct inet6_dev *loopback_idev = | |
224 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
225 | if (loopback_idev != NULL) { |
226 | rt->rt6i_idev = loopback_idev; | |
227 | in6_dev_put(idev); | |
228 | } | |
229 | } | |
230 | } | |
231 | ||
232 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
233 | { | |
234 | return (rt->rt6i_flags & RTF_EXPIRES && | |
235 | time_after(jiffies, rt->rt6i_expires)); | |
236 | } | |
237 | ||
c71099ac TG |
238 | static inline int rt6_need_strict(struct in6_addr *daddr) |
239 | { | |
240 | return (ipv6_addr_type(daddr) & | |
241 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
242 | } | |
243 | ||
1da177e4 | 244 | /* |
c71099ac | 245 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
246 | */ |
247 | ||
248 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
249 | int oif, | |
250 | int strict) | |
251 | { | |
252 | struct rt6_info *local = NULL; | |
253 | struct rt6_info *sprt; | |
254 | ||
255 | if (oif) { | |
7cc48263 | 256 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
257 | struct net_device *dev = sprt->rt6i_dev; |
258 | if (dev->ifindex == oif) | |
259 | return sprt; | |
260 | if (dev->flags & IFF_LOOPBACK) { | |
261 | if (sprt->rt6i_idev == NULL || | |
262 | sprt->rt6i_idev->dev->ifindex != oif) { | |
263 | if (strict && oif) | |
264 | continue; | |
1ab1457c | 265 | if (local && (!oif || |
1da177e4 LT |
266 | local->rt6i_idev->dev->ifindex == oif)) |
267 | continue; | |
268 | } | |
269 | local = sprt; | |
270 | } | |
271 | } | |
272 | ||
273 | if (local) | |
274 | return local; | |
275 | ||
276 | if (strict) | |
bdb3289f | 277 | return ip6_null_entry; |
1da177e4 LT |
278 | } |
279 | return rt; | |
280 | } | |
281 | ||
27097255 YH |
282 | #ifdef CONFIG_IPV6_ROUTER_PREF |
283 | static void rt6_probe(struct rt6_info *rt) | |
284 | { | |
285 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
286 | /* | |
287 | * Okay, this does not seem to be appropriate | |
288 | * for now, however, we need to check if it | |
289 | * is really so; aka Router Reachability Probing. | |
290 | * | |
291 | * Router Reachability Probe MUST be rate-limited | |
292 | * to no more than one per minute. | |
293 | */ | |
294 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
295 | return; | |
296 | read_lock_bh(&neigh->lock); | |
297 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 298 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
299 | struct in6_addr mcaddr; |
300 | struct in6_addr *target; | |
301 | ||
302 | neigh->updated = jiffies; | |
303 | read_unlock_bh(&neigh->lock); | |
304 | ||
305 | target = (struct in6_addr *)&neigh->primary_key; | |
306 | addrconf_addr_solict_mult(target, &mcaddr); | |
307 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
308 | } else | |
309 | read_unlock_bh(&neigh->lock); | |
310 | } | |
311 | #else | |
312 | static inline void rt6_probe(struct rt6_info *rt) | |
313 | { | |
314 | return; | |
315 | } | |
316 | #endif | |
317 | ||
1da177e4 | 318 | /* |
554cfb7e | 319 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 320 | */ |
b6f99a21 | 321 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
322 | { |
323 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 324 | if (!oif || dev->ifindex == oif) |
554cfb7e | 325 | return 2; |
161980f4 DM |
326 | if ((dev->flags & IFF_LOOPBACK) && |
327 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
328 | return 1; | |
329 | return 0; | |
554cfb7e | 330 | } |
1da177e4 | 331 | |
b6f99a21 | 332 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 333 | { |
554cfb7e | 334 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 335 | int m; |
4d0c5911 YH |
336 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
337 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
338 | m = 1; | |
339 | else if (neigh) { | |
554cfb7e YH |
340 | read_lock_bh(&neigh->lock); |
341 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 342 | m = 2; |
398bcbeb YH |
343 | #ifdef CONFIG_IPV6_ROUTER_PREF |
344 | else if (neigh->nud_state & NUD_FAILED) | |
345 | m = 0; | |
346 | #endif | |
347 | else | |
ea73ee23 | 348 | m = 1; |
554cfb7e | 349 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
350 | } else |
351 | m = 0; | |
554cfb7e | 352 | return m; |
1da177e4 LT |
353 | } |
354 | ||
554cfb7e YH |
355 | static int rt6_score_route(struct rt6_info *rt, int oif, |
356 | int strict) | |
1da177e4 | 357 | { |
4d0c5911 | 358 | int m, n; |
1ab1457c | 359 | |
4d0c5911 | 360 | m = rt6_check_dev(rt, oif); |
77d16f45 | 361 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 362 | return -1; |
ebacaaa0 YH |
363 | #ifdef CONFIG_IPV6_ROUTER_PREF |
364 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
365 | #endif | |
4d0c5911 | 366 | n = rt6_check_neigh(rt); |
557e92ef | 367 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
368 | return -1; |
369 | return m; | |
370 | } | |
371 | ||
f11e6659 DM |
372 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
373 | int *mpri, struct rt6_info *match) | |
554cfb7e | 374 | { |
f11e6659 DM |
375 | int m; |
376 | ||
377 | if (rt6_check_expired(rt)) | |
378 | goto out; | |
379 | ||
380 | m = rt6_score_route(rt, oif, strict); | |
381 | if (m < 0) | |
382 | goto out; | |
383 | ||
384 | if (m > *mpri) { | |
385 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
386 | rt6_probe(match); | |
387 | *mpri = m; | |
388 | match = rt; | |
389 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
390 | rt6_probe(rt); | |
391 | } | |
392 | ||
393 | out: | |
394 | return match; | |
395 | } | |
396 | ||
397 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
398 | struct rt6_info *rr_head, | |
399 | u32 metric, int oif, int strict) | |
400 | { | |
401 | struct rt6_info *rt, *match; | |
554cfb7e | 402 | int mpri = -1; |
1da177e4 | 403 | |
f11e6659 DM |
404 | match = NULL; |
405 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
406 | rt = rt->u.dst.rt6_next) | |
407 | match = find_match(rt, oif, strict, &mpri, match); | |
408 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
409 | rt = rt->u.dst.rt6_next) | |
410 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 411 | |
f11e6659 DM |
412 | return match; |
413 | } | |
1da177e4 | 414 | |
f11e6659 DM |
415 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
416 | { | |
417 | struct rt6_info *match, *rt0; | |
1da177e4 | 418 | |
f11e6659 DM |
419 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
420 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 421 | |
f11e6659 DM |
422 | rt0 = fn->rr_ptr; |
423 | if (!rt0) | |
424 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 425 | |
f11e6659 | 426 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 427 | |
554cfb7e | 428 | if (!match && |
f11e6659 DM |
429 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
430 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
431 | ||
554cfb7e | 432 | /* no entries matched; do round-robin */ |
f11e6659 DM |
433 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
434 | next = fn->leaf; | |
435 | ||
436 | if (next != rt0) | |
437 | fn->rr_ptr = next; | |
1da177e4 | 438 | } |
1da177e4 | 439 | |
f11e6659 DM |
440 | RT6_TRACE("%s() => %p\n", |
441 | __FUNCTION__, match); | |
1da177e4 | 442 | |
bdb3289f | 443 | return (match ? match : ip6_null_entry); |
1da177e4 LT |
444 | } |
445 | ||
70ceb4f5 YH |
446 | #ifdef CONFIG_IPV6_ROUTE_INFO |
447 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
448 | struct in6_addr *gwaddr) | |
449 | { | |
efa2cea0 | 450 | struct net *net = dev->nd_net; |
70ceb4f5 YH |
451 | struct route_info *rinfo = (struct route_info *) opt; |
452 | struct in6_addr prefix_buf, *prefix; | |
453 | unsigned int pref; | |
454 | u32 lifetime; | |
455 | struct rt6_info *rt; | |
456 | ||
457 | if (len < sizeof(struct route_info)) { | |
458 | return -EINVAL; | |
459 | } | |
460 | ||
461 | /* Sanity check for prefix_len and length */ | |
462 | if (rinfo->length > 3) { | |
463 | return -EINVAL; | |
464 | } else if (rinfo->prefix_len > 128) { | |
465 | return -EINVAL; | |
466 | } else if (rinfo->prefix_len > 64) { | |
467 | if (rinfo->length < 2) { | |
468 | return -EINVAL; | |
469 | } | |
470 | } else if (rinfo->prefix_len > 0) { | |
471 | if (rinfo->length < 1) { | |
472 | return -EINVAL; | |
473 | } | |
474 | } | |
475 | ||
476 | pref = rinfo->route_pref; | |
477 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
478 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
479 | ||
e69a4adc | 480 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
481 | if (lifetime == 0xffffffff) { |
482 | /* infinity */ | |
483 | } else if (lifetime > 0x7fffffff/HZ) { | |
484 | /* Avoid arithmetic overflow */ | |
485 | lifetime = 0x7fffffff/HZ - 1; | |
486 | } | |
487 | ||
488 | if (rinfo->length == 3) | |
489 | prefix = (struct in6_addr *)rinfo->prefix; | |
490 | else { | |
491 | /* this function is safe */ | |
492 | ipv6_addr_prefix(&prefix_buf, | |
493 | (struct in6_addr *)rinfo->prefix, | |
494 | rinfo->prefix_len); | |
495 | prefix = &prefix_buf; | |
496 | } | |
497 | ||
efa2cea0 DL |
498 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
499 | dev->ifindex); | |
70ceb4f5 YH |
500 | |
501 | if (rt && !lifetime) { | |
e0a1ad73 | 502 | ip6_del_rt(rt); |
70ceb4f5 YH |
503 | rt = NULL; |
504 | } | |
505 | ||
506 | if (!rt && lifetime) | |
efa2cea0 | 507 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
508 | pref); |
509 | else if (rt) | |
510 | rt->rt6i_flags = RTF_ROUTEINFO | | |
511 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
512 | ||
513 | if (rt) { | |
514 | if (lifetime == 0xffffffff) { | |
515 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
516 | } else { | |
517 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
518 | rt->rt6i_flags |= RTF_EXPIRES; | |
519 | } | |
520 | dst_release(&rt->u.dst); | |
521 | } | |
522 | return 0; | |
523 | } | |
524 | #endif | |
525 | ||
982f56f3 YH |
526 | #define BACKTRACK(saddr) \ |
527 | do { \ | |
bdb3289f | 528 | if (rt == ip6_null_entry) { \ |
982f56f3 | 529 | struct fib6_node *pn; \ |
e0eda7bb | 530 | while (1) { \ |
982f56f3 YH |
531 | if (fn->fn_flags & RTN_TL_ROOT) \ |
532 | goto out; \ | |
533 | pn = fn->parent; \ | |
534 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 535 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
536 | else \ |
537 | fn = pn; \ | |
538 | if (fn->fn_flags & RTN_RTINFO) \ | |
539 | goto restart; \ | |
c71099ac | 540 | } \ |
c71099ac | 541 | } \ |
982f56f3 | 542 | } while(0) |
c71099ac TG |
543 | |
544 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
545 | struct flowi *fl, int flags) | |
1da177e4 LT |
546 | { |
547 | struct fib6_node *fn; | |
548 | struct rt6_info *rt; | |
549 | ||
c71099ac TG |
550 | read_lock_bh(&table->tb6_lock); |
551 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
552 | restart: | |
553 | rt = fn->leaf; | |
77d16f45 | 554 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 555 | BACKTRACK(&fl->fl6_src); |
c71099ac | 556 | out: |
03f49f34 | 557 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 558 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
559 | return rt; |
560 | ||
561 | } | |
562 | ||
606a2b48 DL |
563 | struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr, |
564 | struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
565 | { |
566 | struct flowi fl = { | |
567 | .oif = oif, | |
568 | .nl_u = { | |
569 | .ip6_u = { | |
570 | .daddr = *daddr, | |
c71099ac TG |
571 | }, |
572 | }, | |
573 | }; | |
574 | struct dst_entry *dst; | |
77d16f45 | 575 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 576 | |
adaa70bb TG |
577 | if (saddr) { |
578 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
579 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
580 | } | |
581 | ||
606a2b48 | 582 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
583 | if (dst->error == 0) |
584 | return (struct rt6_info *) dst; | |
585 | ||
586 | dst_release(dst); | |
587 | ||
1da177e4 LT |
588 | return NULL; |
589 | } | |
590 | ||
7159039a YH |
591 | EXPORT_SYMBOL(rt6_lookup); |
592 | ||
c71099ac | 593 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
594 | It takes new route entry, the addition fails by any reason the |
595 | route is freed. In any case, if caller does not hold it, it may | |
596 | be destroyed. | |
597 | */ | |
598 | ||
86872cb5 | 599 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
600 | { |
601 | int err; | |
c71099ac | 602 | struct fib6_table *table; |
1da177e4 | 603 | |
c71099ac TG |
604 | table = rt->rt6i_table; |
605 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 606 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 607 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
608 | |
609 | return err; | |
610 | } | |
611 | ||
40e22e8f TG |
612 | int ip6_ins_rt(struct rt6_info *rt) |
613 | { | |
4d1169c1 | 614 | struct nl_info info = { |
5578689a | 615 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 616 | }; |
528c4ceb | 617 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
618 | } |
619 | ||
95a9a5ba YH |
620 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
621 | struct in6_addr *saddr) | |
1da177e4 | 622 | { |
1da177e4 LT |
623 | struct rt6_info *rt; |
624 | ||
625 | /* | |
626 | * Clone the route. | |
627 | */ | |
628 | ||
629 | rt = ip6_rt_copy(ort); | |
630 | ||
631 | if (rt) { | |
58c4fb86 YH |
632 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
633 | if (rt->rt6i_dst.plen != 128 && | |
634 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
635 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 636 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 637 | } |
1da177e4 | 638 | |
58c4fb86 | 639 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
640 | rt->rt6i_dst.plen = 128; |
641 | rt->rt6i_flags |= RTF_CACHE; | |
642 | rt->u.dst.flags |= DST_HOST; | |
643 | ||
644 | #ifdef CONFIG_IPV6_SUBTREES | |
645 | if (rt->rt6i_src.plen && saddr) { | |
646 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
647 | rt->rt6i_src.plen = 128; | |
648 | } | |
649 | #endif | |
650 | ||
651 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
652 | ||
95a9a5ba | 653 | } |
1da177e4 | 654 | |
95a9a5ba YH |
655 | return rt; |
656 | } | |
1da177e4 | 657 | |
299d9939 YH |
658 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
659 | { | |
660 | struct rt6_info *rt = ip6_rt_copy(ort); | |
661 | if (rt) { | |
662 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
663 | rt->rt6i_dst.plen = 128; | |
664 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
665 | rt->u.dst.flags |= DST_HOST; |
666 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
667 | } | |
668 | return rt; | |
669 | } | |
670 | ||
4acad72d | 671 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, |
8ce11e6a | 672 | struct flowi *fl, int flags) |
1da177e4 LT |
673 | { |
674 | struct fib6_node *fn; | |
519fbd87 | 675 | struct rt6_info *rt, *nrt; |
c71099ac | 676 | int strict = 0; |
1da177e4 | 677 | int attempts = 3; |
519fbd87 | 678 | int err; |
ea659e07 | 679 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 680 | |
77d16f45 | 681 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
682 | |
683 | relookup: | |
c71099ac | 684 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 685 | |
8238dd06 | 686 | restart_2: |
c71099ac | 687 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
688 | |
689 | restart: | |
4acad72d | 690 | rt = rt6_select(fn, oif, strict | reachable); |
982f56f3 | 691 | BACKTRACK(&fl->fl6_src); |
bdb3289f | 692 | if (rt == ip6_null_entry || |
8238dd06 | 693 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 694 | goto out; |
1da177e4 | 695 | |
fb9de91e | 696 | dst_hold(&rt->u.dst); |
c71099ac | 697 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 698 | |
519fbd87 | 699 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 700 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
701 | else { |
702 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 703 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
704 | #else |
705 | goto out2; | |
706 | #endif | |
707 | } | |
e40cf353 | 708 | |
519fbd87 | 709 | dst_release(&rt->u.dst); |
bdb3289f | 710 | rt = nrt ? : ip6_null_entry; |
1da177e4 | 711 | |
519fbd87 YH |
712 | dst_hold(&rt->u.dst); |
713 | if (nrt) { | |
40e22e8f | 714 | err = ip6_ins_rt(nrt); |
519fbd87 | 715 | if (!err) |
1da177e4 | 716 | goto out2; |
1da177e4 | 717 | } |
1da177e4 | 718 | |
519fbd87 YH |
719 | if (--attempts <= 0) |
720 | goto out2; | |
721 | ||
722 | /* | |
c71099ac | 723 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
724 | * released someone could insert this route. Relookup. |
725 | */ | |
726 | dst_release(&rt->u.dst); | |
727 | goto relookup; | |
728 | ||
729 | out: | |
8238dd06 YH |
730 | if (reachable) { |
731 | reachable = 0; | |
732 | goto restart_2; | |
733 | } | |
519fbd87 | 734 | dst_hold(&rt->u.dst); |
c71099ac | 735 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
736 | out2: |
737 | rt->u.dst.lastuse = jiffies; | |
738 | rt->u.dst.__use++; | |
c71099ac TG |
739 | |
740 | return rt; | |
1da177e4 LT |
741 | } |
742 | ||
4acad72d PE |
743 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
744 | struct flowi *fl, int flags) | |
745 | { | |
746 | return ip6_pol_route(table, fl->iif, fl, flags); | |
747 | } | |
748 | ||
c71099ac TG |
749 | void ip6_route_input(struct sk_buff *skb) |
750 | { | |
0660e03f | 751 | struct ipv6hdr *iph = ipv6_hdr(skb); |
5578689a | 752 | struct net *net = skb->dev->nd_net; |
adaa70bb | 753 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
754 | struct flowi fl = { |
755 | .iif = skb->dev->ifindex, | |
756 | .nl_u = { | |
757 | .ip6_u = { | |
758 | .daddr = iph->daddr, | |
759 | .saddr = iph->saddr, | |
90bcaf7b | 760 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
761 | }, |
762 | }, | |
1ab1457c | 763 | .mark = skb->mark, |
c71099ac TG |
764 | .proto = iph->nexthdr, |
765 | }; | |
adaa70bb TG |
766 | |
767 | if (rt6_need_strict(&iph->daddr)) | |
768 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 769 | |
5578689a | 770 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
771 | } |
772 | ||
773 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
774 | struct flowi *fl, int flags) | |
1da177e4 | 775 | { |
4acad72d | 776 | return ip6_pol_route(table, fl->oif, fl, flags); |
c71099ac TG |
777 | } |
778 | ||
779 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
780 | { | |
781 | int flags = 0; | |
782 | ||
783 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 784 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 785 | |
adaa70bb TG |
786 | if (!ipv6_addr_any(&fl->fl6_src)) |
787 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
788 | ||
58f09b78 | 789 | return fib6_rule_lookup(&init_net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
790 | } |
791 | ||
7159039a | 792 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 793 | |
14e50e57 DM |
794 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
795 | { | |
796 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
797 | struct rt6_info *rt = (struct rt6_info *) | |
798 | dst_alloc(&ip6_dst_blackhole_ops); | |
799 | struct dst_entry *new = NULL; | |
800 | ||
801 | if (rt) { | |
802 | new = &rt->u.dst; | |
803 | ||
804 | atomic_set(&new->__refcnt, 1); | |
805 | new->__use = 1; | |
352e512c HX |
806 | new->input = dst_discard; |
807 | new->output = dst_discard; | |
14e50e57 DM |
808 | |
809 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
810 | new->dev = ort->u.dst.dev; | |
811 | if (new->dev) | |
812 | dev_hold(new->dev); | |
813 | rt->rt6i_idev = ort->rt6i_idev; | |
814 | if (rt->rt6i_idev) | |
815 | in6_dev_hold(rt->rt6i_idev); | |
816 | rt->rt6i_expires = 0; | |
817 | ||
818 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
819 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
820 | rt->rt6i_metric = 0; | |
821 | ||
822 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
823 | #ifdef CONFIG_IPV6_SUBTREES | |
824 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
825 | #endif | |
826 | ||
827 | dst_free(new); | |
828 | } | |
829 | ||
830 | dst_release(*dstp); | |
831 | *dstp = new; | |
832 | return (new ? 0 : -ENOMEM); | |
833 | } | |
834 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
835 | ||
1da177e4 LT |
836 | /* |
837 | * Destination cache support functions | |
838 | */ | |
839 | ||
840 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
841 | { | |
842 | struct rt6_info *rt; | |
843 | ||
844 | rt = (struct rt6_info *) dst; | |
845 | ||
846 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
847 | return dst; | |
848 | ||
849 | return NULL; | |
850 | } | |
851 | ||
852 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
853 | { | |
854 | struct rt6_info *rt = (struct rt6_info *) dst; | |
855 | ||
856 | if (rt) { | |
857 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 858 | ip6_del_rt(rt); |
1da177e4 LT |
859 | else |
860 | dst_release(dst); | |
861 | } | |
862 | return NULL; | |
863 | } | |
864 | ||
865 | static void ip6_link_failure(struct sk_buff *skb) | |
866 | { | |
867 | struct rt6_info *rt; | |
868 | ||
869 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
870 | ||
871 | rt = (struct rt6_info *) skb->dst; | |
872 | if (rt) { | |
873 | if (rt->rt6i_flags&RTF_CACHE) { | |
874 | dst_set_expires(&rt->u.dst, 0); | |
875 | rt->rt6i_flags |= RTF_EXPIRES; | |
876 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
877 | rt->rt6i_node->fn_sernum = -1; | |
878 | } | |
879 | } | |
880 | ||
881 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
882 | { | |
883 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
884 | ||
885 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
886 | rt6->rt6i_flags |= RTF_MODIFIED; | |
887 | if (mtu < IPV6_MIN_MTU) { | |
888 | mtu = IPV6_MIN_MTU; | |
889 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
890 | } | |
891 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 892 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
893 | } |
894 | } | |
895 | ||
1da177e4 LT |
896 | static int ipv6_get_mtu(struct net_device *dev); |
897 | ||
5578689a | 898 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
899 | { |
900 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
901 | ||
5578689a DL |
902 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
903 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
904 | |
905 | /* | |
1ab1457c YH |
906 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
907 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
908 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
909 | * rely only on pmtu discovery" |
910 | */ | |
911 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
912 | mtu = IPV6_MAXPLEN; | |
913 | return mtu; | |
914 | } | |
915 | ||
3b00944c YH |
916 | static struct dst_entry *icmp6_dst_gc_list; |
917 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 918 | |
3b00944c | 919 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 920 | struct neighbour *neigh, |
3b00944c | 921 | struct in6_addr *addr) |
1da177e4 LT |
922 | { |
923 | struct rt6_info *rt; | |
924 | struct inet6_dev *idev = in6_dev_get(dev); | |
5578689a | 925 | struct net *net = dev->nd_net; |
1da177e4 LT |
926 | |
927 | if (unlikely(idev == NULL)) | |
928 | return NULL; | |
929 | ||
930 | rt = ip6_dst_alloc(); | |
931 | if (unlikely(rt == NULL)) { | |
932 | in6_dev_put(idev); | |
933 | goto out; | |
934 | } | |
935 | ||
936 | dev_hold(dev); | |
937 | if (neigh) | |
938 | neigh_hold(neigh); | |
939 | else | |
940 | neigh = ndisc_get_neigh(dev, addr); | |
941 | ||
942 | rt->rt6i_dev = dev; | |
943 | rt->rt6i_idev = idev; | |
944 | rt->rt6i_nexthop = neigh; | |
945 | atomic_set(&rt->u.dst.__refcnt, 1); | |
946 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
947 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 948 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 949 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
950 | |
951 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
952 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
953 | ? DST_HOST | |
1da177e4 LT |
954 | : 0; |
955 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
956 | rt->rt6i_dst.plen = 128; | |
957 | #endif | |
958 | ||
3b00944c YH |
959 | spin_lock_bh(&icmp6_dst_lock); |
960 | rt->u.dst.next = icmp6_dst_gc_list; | |
961 | icmp6_dst_gc_list = &rt->u.dst; | |
962 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 963 | |
5578689a | 964 | fib6_force_start_gc(net); |
1da177e4 LT |
965 | |
966 | out: | |
40aa7b90 | 967 | return &rt->u.dst; |
1da177e4 LT |
968 | } |
969 | ||
3b00944c | 970 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
971 | { |
972 | struct dst_entry *dst, *next, **pprev; | |
973 | int freed; | |
974 | ||
975 | next = NULL; | |
1ab1457c | 976 | freed = 0; |
5d0bbeeb | 977 | |
3b00944c YH |
978 | spin_lock_bh(&icmp6_dst_lock); |
979 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 980 | |
1da177e4 LT |
981 | while ((dst = *pprev) != NULL) { |
982 | if (!atomic_read(&dst->__refcnt)) { | |
983 | *pprev = dst->next; | |
984 | dst_free(dst); | |
985 | freed++; | |
986 | } else { | |
987 | pprev = &dst->next; | |
988 | (*more)++; | |
989 | } | |
990 | } | |
991 | ||
3b00944c | 992 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 993 | |
1da177e4 LT |
994 | return freed; |
995 | } | |
996 | ||
569d3645 | 997 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 LT |
998 | { |
999 | static unsigned expire = 30*HZ; | |
1000 | static unsigned long last_gc; | |
1001 | unsigned long now = jiffies; | |
1002 | ||
4990509f DL |
1003 | if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && |
1004 | atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) | |
1da177e4 LT |
1005 | goto out; |
1006 | ||
1007 | expire++; | |
5b7c931d | 1008 | fib6_run_gc(expire, &init_net); |
1da177e4 LT |
1009 | last_gc = now; |
1010 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
4990509f | 1011 | expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; |
1da177e4 LT |
1012 | |
1013 | out: | |
4990509f DL |
1014 | expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; |
1015 | return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size); | |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1019 | but results in cleaner routing tables. | |
1020 | ||
1021 | Remove it only when all the things will work! | |
1022 | */ | |
1023 | ||
1024 | static int ipv6_get_mtu(struct net_device *dev) | |
1025 | { | |
1026 | int mtu = IPV6_MIN_MTU; | |
1027 | struct inet6_dev *idev; | |
1028 | ||
1029 | idev = in6_dev_get(dev); | |
1030 | if (idev) { | |
1031 | mtu = idev->cnf.mtu6; | |
1032 | in6_dev_put(idev); | |
1033 | } | |
1034 | return mtu; | |
1035 | } | |
1036 | ||
1037 | int ipv6_get_hoplimit(struct net_device *dev) | |
1038 | { | |
1039 | int hoplimit = ipv6_devconf.hop_limit; | |
1040 | struct inet6_dev *idev; | |
1041 | ||
1042 | idev = in6_dev_get(dev); | |
1043 | if (idev) { | |
1044 | hoplimit = idev->cnf.hop_limit; | |
1045 | in6_dev_put(idev); | |
1046 | } | |
1047 | return hoplimit; | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * | |
1052 | */ | |
1053 | ||
86872cb5 | 1054 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1055 | { |
1056 | int err; | |
5578689a | 1057 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1058 | struct rt6_info *rt = NULL; |
1059 | struct net_device *dev = NULL; | |
1060 | struct inet6_dev *idev = NULL; | |
c71099ac | 1061 | struct fib6_table *table; |
1da177e4 LT |
1062 | int addr_type; |
1063 | ||
86872cb5 | 1064 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1065 | return -EINVAL; |
1066 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1067 | if (cfg->fc_src_len) |
1da177e4 LT |
1068 | return -EINVAL; |
1069 | #endif | |
86872cb5 | 1070 | if (cfg->fc_ifindex) { |
1da177e4 | 1071 | err = -ENODEV; |
5578689a | 1072 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1073 | if (!dev) |
1074 | goto out; | |
1075 | idev = in6_dev_get(dev); | |
1076 | if (!idev) | |
1077 | goto out; | |
1078 | } | |
1079 | ||
86872cb5 TG |
1080 | if (cfg->fc_metric == 0) |
1081 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1082 | |
5578689a | 1083 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1084 | if (table == NULL) { |
1085 | err = -ENOBUFS; | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1da177e4 LT |
1089 | rt = ip6_dst_alloc(); |
1090 | ||
1091 | if (rt == NULL) { | |
1092 | err = -ENOMEM; | |
1093 | goto out; | |
1094 | } | |
1095 | ||
1096 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1097 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1098 | |
86872cb5 TG |
1099 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1100 | cfg->fc_protocol = RTPROT_BOOT; | |
1101 | rt->rt6i_protocol = cfg->fc_protocol; | |
1102 | ||
1103 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1104 | |
1105 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1106 | rt->u.dst.input = ip6_mc_input; | |
1107 | else | |
1108 | rt->u.dst.input = ip6_forward; | |
1109 | ||
1110 | rt->u.dst.output = ip6_output; | |
1111 | ||
86872cb5 TG |
1112 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1113 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1114 | if (rt->rt6i_dst.plen == 128) |
1115 | rt->u.dst.flags = DST_HOST; | |
1116 | ||
1117 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1118 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1119 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1120 | #endif |
1121 | ||
86872cb5 | 1122 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1123 | |
1124 | /* We cannot add true routes via loopback here, | |
1125 | they would result in kernel looping; promote them to reject routes | |
1126 | */ | |
86872cb5 | 1127 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1128 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1129 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1130 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1131 | if (dev) { |
1132 | dev_put(dev); | |
1133 | in6_dev_put(idev); | |
1134 | } | |
5578689a | 1135 | dev = net->loopback_dev; |
1da177e4 LT |
1136 | dev_hold(dev); |
1137 | idev = in6_dev_get(dev); | |
1138 | if (!idev) { | |
1139 | err = -ENODEV; | |
1140 | goto out; | |
1141 | } | |
1142 | } | |
1143 | rt->u.dst.output = ip6_pkt_discard_out; | |
1144 | rt->u.dst.input = ip6_pkt_discard; | |
1145 | rt->u.dst.error = -ENETUNREACH; | |
1146 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1147 | goto install_route; | |
1148 | } | |
1149 | ||
86872cb5 | 1150 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1151 | struct in6_addr *gw_addr; |
1152 | int gwa_type; | |
1153 | ||
86872cb5 TG |
1154 | gw_addr = &cfg->fc_gateway; |
1155 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1156 | gwa_type = ipv6_addr_type(gw_addr); |
1157 | ||
1158 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1159 | struct rt6_info *grt; | |
1160 | ||
1161 | /* IPv6 strictly inhibits using not link-local | |
1162 | addresses as nexthop address. | |
1163 | Otherwise, router will not able to send redirects. | |
1164 | It is very good, but in some (rare!) circumstances | |
1165 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1166 | some exceptions. --ANK | |
1167 | */ | |
1168 | err = -EINVAL; | |
1169 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1170 | goto out; | |
1171 | ||
5578689a | 1172 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1173 | |
1174 | err = -EHOSTUNREACH; | |
1175 | if (grt == NULL) | |
1176 | goto out; | |
1177 | if (dev) { | |
1178 | if (dev != grt->rt6i_dev) { | |
1179 | dst_release(&grt->u.dst); | |
1180 | goto out; | |
1181 | } | |
1182 | } else { | |
1183 | dev = grt->rt6i_dev; | |
1184 | idev = grt->rt6i_idev; | |
1185 | dev_hold(dev); | |
1186 | in6_dev_hold(grt->rt6i_idev); | |
1187 | } | |
1188 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1189 | err = 0; | |
1190 | dst_release(&grt->u.dst); | |
1191 | ||
1192 | if (err) | |
1193 | goto out; | |
1194 | } | |
1195 | err = -EINVAL; | |
1196 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1197 | goto out; | |
1198 | } | |
1199 | ||
1200 | err = -ENODEV; | |
1201 | if (dev == NULL) | |
1202 | goto out; | |
1203 | ||
86872cb5 | 1204 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1205 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1206 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1207 | err = PTR_ERR(rt->rt6i_nexthop); | |
1208 | rt->rt6i_nexthop = NULL; | |
1209 | goto out; | |
1210 | } | |
1211 | } | |
1212 | ||
86872cb5 | 1213 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1214 | |
1215 | install_route: | |
86872cb5 TG |
1216 | if (cfg->fc_mx) { |
1217 | struct nlattr *nla; | |
1218 | int remaining; | |
1219 | ||
1220 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1221 | int type = nla_type(nla); |
86872cb5 TG |
1222 | |
1223 | if (type) { | |
1224 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1225 | err = -EINVAL; |
1226 | goto out; | |
1227 | } | |
86872cb5 TG |
1228 | |
1229 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1230 | } |
1da177e4 LT |
1231 | } |
1232 | } | |
1233 | ||
1234 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1235 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1236 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1237 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1238 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
5578689a | 1239 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1240 | rt->u.dst.dev = dev; |
1241 | rt->rt6i_idev = idev; | |
c71099ac | 1242 | rt->rt6i_table = table; |
63152fc0 DL |
1243 | |
1244 | cfg->fc_nlinfo.nl_net = dev->nd_net; | |
1245 | ||
86872cb5 | 1246 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1247 | |
1248 | out: | |
1249 | if (dev) | |
1250 | dev_put(dev); | |
1251 | if (idev) | |
1252 | in6_dev_put(idev); | |
1253 | if (rt) | |
40aa7b90 | 1254 | dst_free(&rt->u.dst); |
1da177e4 LT |
1255 | return err; |
1256 | } | |
1257 | ||
86872cb5 | 1258 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1259 | { |
1260 | int err; | |
c71099ac | 1261 | struct fib6_table *table; |
1da177e4 | 1262 | |
bdb3289f | 1263 | if (rt == ip6_null_entry) |
6c813a72 PM |
1264 | return -ENOENT; |
1265 | ||
c71099ac TG |
1266 | table = rt->rt6i_table; |
1267 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1268 | |
86872cb5 | 1269 | err = fib6_del(rt, info); |
1da177e4 LT |
1270 | dst_release(&rt->u.dst); |
1271 | ||
c71099ac | 1272 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1273 | |
1274 | return err; | |
1275 | } | |
1276 | ||
e0a1ad73 TG |
1277 | int ip6_del_rt(struct rt6_info *rt) |
1278 | { | |
4d1169c1 | 1279 | struct nl_info info = { |
5578689a | 1280 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 1281 | }; |
528c4ceb | 1282 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1283 | } |
1284 | ||
86872cb5 | 1285 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1286 | { |
c71099ac | 1287 | struct fib6_table *table; |
1da177e4 LT |
1288 | struct fib6_node *fn; |
1289 | struct rt6_info *rt; | |
1290 | int err = -ESRCH; | |
1291 | ||
5578689a | 1292 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1293 | if (table == NULL) |
1294 | return err; | |
1295 | ||
1296 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1297 | |
c71099ac | 1298 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1299 | &cfg->fc_dst, cfg->fc_dst_len, |
1300 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1301 | |
1da177e4 | 1302 | if (fn) { |
7cc48263 | 1303 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1304 | if (cfg->fc_ifindex && |
1da177e4 | 1305 | (rt->rt6i_dev == NULL || |
86872cb5 | 1306 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1307 | continue; |
86872cb5 TG |
1308 | if (cfg->fc_flags & RTF_GATEWAY && |
1309 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1310 | continue; |
86872cb5 | 1311 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1312 | continue; |
1313 | dst_hold(&rt->u.dst); | |
c71099ac | 1314 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1315 | |
86872cb5 | 1316 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1317 | } |
1318 | } | |
c71099ac | 1319 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1320 | |
1321 | return err; | |
1322 | } | |
1323 | ||
1324 | /* | |
1325 | * Handle redirects | |
1326 | */ | |
a6279458 YH |
1327 | struct ip6rd_flowi { |
1328 | struct flowi fl; | |
1329 | struct in6_addr gateway; | |
1330 | }; | |
1331 | ||
1332 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1333 | struct flowi *fl, | |
1334 | int flags) | |
1da177e4 | 1335 | { |
a6279458 YH |
1336 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1337 | struct rt6_info *rt; | |
e843b9e1 | 1338 | struct fib6_node *fn; |
c71099ac | 1339 | |
1da177e4 | 1340 | /* |
e843b9e1 YH |
1341 | * Get the "current" route for this destination and |
1342 | * check if the redirect has come from approriate router. | |
1343 | * | |
1344 | * RFC 2461 specifies that redirects should only be | |
1345 | * accepted if they come from the nexthop to the target. | |
1346 | * Due to the way the routes are chosen, this notion | |
1347 | * is a bit fuzzy and one might need to check all possible | |
1348 | * routes. | |
1da177e4 | 1349 | */ |
1da177e4 | 1350 | |
c71099ac | 1351 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1352 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1353 | restart: |
7cc48263 | 1354 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1355 | /* |
1356 | * Current route is on-link; redirect is always invalid. | |
1357 | * | |
1358 | * Seems, previous statement is not true. It could | |
1359 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1360 | * But then router serving it might decide, that we should | |
1361 | * know truth 8)8) --ANK (980726). | |
1362 | */ | |
1363 | if (rt6_check_expired(rt)) | |
1364 | continue; | |
1365 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1366 | continue; | |
a6279458 | 1367 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1368 | continue; |
a6279458 | 1369 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1370 | continue; |
1371 | break; | |
1372 | } | |
a6279458 | 1373 | |
cb15d9c2 | 1374 | if (!rt) |
bdb3289f | 1375 | rt = ip6_null_entry; |
cb15d9c2 YH |
1376 | BACKTRACK(&fl->fl6_src); |
1377 | out: | |
a6279458 YH |
1378 | dst_hold(&rt->u.dst); |
1379 | ||
c71099ac | 1380 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1381 | |
a6279458 YH |
1382 | return rt; |
1383 | }; | |
1384 | ||
1385 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1386 | struct in6_addr *src, | |
1387 | struct in6_addr *gateway, | |
1388 | struct net_device *dev) | |
1389 | { | |
adaa70bb | 1390 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
5578689a | 1391 | struct net *net = dev->nd_net; |
a6279458 YH |
1392 | struct ip6rd_flowi rdfl = { |
1393 | .fl = { | |
1394 | .oif = dev->ifindex, | |
1395 | .nl_u = { | |
1396 | .ip6_u = { | |
1397 | .daddr = *dest, | |
1398 | .saddr = *src, | |
1399 | }, | |
1400 | }, | |
1401 | }, | |
1402 | .gateway = *gateway, | |
1403 | }; | |
adaa70bb TG |
1404 | |
1405 | if (rt6_need_strict(dest)) | |
1406 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1407 | |
5578689a | 1408 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1409 | flags, __ip6_route_redirect); |
a6279458 YH |
1410 | } |
1411 | ||
1412 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1413 | struct in6_addr *saddr, | |
1414 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1415 | { | |
1416 | struct rt6_info *rt, *nrt = NULL; | |
1417 | struct netevent_redirect netevent; | |
1418 | ||
1419 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1420 | ||
bdb3289f | 1421 | if (rt == ip6_null_entry) { |
1da177e4 LT |
1422 | if (net_ratelimit()) |
1423 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1424 | "for redirect target\n"); | |
a6279458 | 1425 | goto out; |
1da177e4 LT |
1426 | } |
1427 | ||
1da177e4 LT |
1428 | /* |
1429 | * We have finally decided to accept it. | |
1430 | */ | |
1431 | ||
1ab1457c | 1432 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1433 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1434 | NEIGH_UPDATE_F_OVERRIDE| | |
1435 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1436 | NEIGH_UPDATE_F_ISROUTER)) | |
1437 | ); | |
1438 | ||
1439 | /* | |
1440 | * Redirect received -> path was valid. | |
1441 | * Look, redirects are sent only in response to data packets, | |
1442 | * so that this nexthop apparently is reachable. --ANK | |
1443 | */ | |
1444 | dst_confirm(&rt->u.dst); | |
1445 | ||
1446 | /* Duplicate redirect: silently ignore. */ | |
1447 | if (neigh == rt->u.dst.neighbour) | |
1448 | goto out; | |
1449 | ||
1450 | nrt = ip6_rt_copy(rt); | |
1451 | if (nrt == NULL) | |
1452 | goto out; | |
1453 | ||
1454 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1455 | if (on_link) | |
1456 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1457 | ||
1458 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1459 | nrt->rt6i_dst.plen = 128; | |
1460 | nrt->u.dst.flags |= DST_HOST; | |
1461 | ||
1462 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1463 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1464 | /* Reset pmtu, it may be better */ | |
1465 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
5578689a DL |
1466 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(neigh->dev->nd_net, |
1467 | dst_mtu(&nrt->u.dst)); | |
1da177e4 | 1468 | |
40e22e8f | 1469 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1470 | goto out; |
1471 | ||
8d71740c TT |
1472 | netevent.old = &rt->u.dst; |
1473 | netevent.new = &nrt->u.dst; | |
1474 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1475 | ||
1da177e4 | 1476 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1477 | ip6_del_rt(rt); |
1da177e4 LT |
1478 | return; |
1479 | } | |
1480 | ||
1481 | out: | |
1ab1457c | 1482 | dst_release(&rt->u.dst); |
1da177e4 LT |
1483 | return; |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Handle ICMP "packet too big" messages | |
1488 | * i.e. Path MTU discovery | |
1489 | */ | |
1490 | ||
1491 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1492 | struct net_device *dev, u32 pmtu) | |
1493 | { | |
1494 | struct rt6_info *rt, *nrt; | |
5578689a | 1495 | struct net *net = dev->nd_net; |
1da177e4 LT |
1496 | int allfrag = 0; |
1497 | ||
5578689a | 1498 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1499 | if (rt == NULL) |
1500 | return; | |
1501 | ||
1502 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1503 | goto out; | |
1504 | ||
1505 | if (pmtu < IPV6_MIN_MTU) { | |
1506 | /* | |
1ab1457c | 1507 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1508 | * MTU (1280) and a fragment header should always be included |
1509 | * after a node receiving Too Big message reporting PMTU is | |
1510 | * less than the IPv6 Minimum Link MTU. | |
1511 | */ | |
1512 | pmtu = IPV6_MIN_MTU; | |
1513 | allfrag = 1; | |
1514 | } | |
1515 | ||
1516 | /* New mtu received -> path was valid. | |
1517 | They are sent only in response to data packets, | |
1518 | so that this nexthop apparently is reachable. --ANK | |
1519 | */ | |
1520 | dst_confirm(&rt->u.dst); | |
1521 | ||
1522 | /* Host route. If it is static, it would be better | |
1523 | not to override it, but add new one, so that | |
1524 | when cache entry will expire old pmtu | |
1525 | would return automatically. | |
1526 | */ | |
1527 | if (rt->rt6i_flags & RTF_CACHE) { | |
1528 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1529 | if (allfrag) | |
1530 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1531 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1532 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1533 | goto out; | |
1534 | } | |
1535 | ||
1536 | /* Network route. | |
1537 | Two cases are possible: | |
1538 | 1. It is connected route. Action: COW | |
1539 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1540 | */ | |
d5315b50 | 1541 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1542 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1543 | else |
1544 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1545 | |
d5315b50 | 1546 | if (nrt) { |
a1e78363 YH |
1547 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1548 | if (allfrag) | |
1549 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1550 | ||
1551 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1552 | * happened within 5 mins, the recommended timer is 10 mins. | |
1553 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1554 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1555 | * and detecting PMTU increase will be automatically happened. | |
1556 | */ | |
5578689a | 1557 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1558 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1559 | ||
40e22e8f | 1560 | ip6_ins_rt(nrt); |
1da177e4 | 1561 | } |
1da177e4 LT |
1562 | out: |
1563 | dst_release(&rt->u.dst); | |
1564 | } | |
1565 | ||
1566 | /* | |
1567 | * Misc support functions | |
1568 | */ | |
1569 | ||
1570 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1571 | { | |
1572 | struct rt6_info *rt = ip6_dst_alloc(); | |
1573 | ||
1574 | if (rt) { | |
1575 | rt->u.dst.input = ort->u.dst.input; | |
1576 | rt->u.dst.output = ort->u.dst.output; | |
1577 | ||
1578 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1579 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1580 | rt->u.dst.dev = ort->u.dst.dev; |
1581 | if (rt->u.dst.dev) | |
1582 | dev_hold(rt->u.dst.dev); | |
1583 | rt->rt6i_idev = ort->rt6i_idev; | |
1584 | if (rt->rt6i_idev) | |
1585 | in6_dev_hold(rt->rt6i_idev); | |
1586 | rt->u.dst.lastuse = jiffies; | |
1587 | rt->rt6i_expires = 0; | |
1588 | ||
1589 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1590 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1591 | rt->rt6i_metric = 0; | |
1592 | ||
1593 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1594 | #ifdef CONFIG_IPV6_SUBTREES | |
1595 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1596 | #endif | |
c71099ac | 1597 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1598 | } |
1599 | return rt; | |
1600 | } | |
1601 | ||
70ceb4f5 | 1602 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1603 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1604 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1605 | struct in6_addr *gwaddr, int ifindex) |
1606 | { | |
1607 | struct fib6_node *fn; | |
1608 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1609 | struct fib6_table *table; |
1610 | ||
efa2cea0 | 1611 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1612 | if (table == NULL) |
1613 | return NULL; | |
70ceb4f5 | 1614 | |
c71099ac TG |
1615 | write_lock_bh(&table->tb6_lock); |
1616 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1617 | if (!fn) |
1618 | goto out; | |
1619 | ||
7cc48263 | 1620 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1621 | if (rt->rt6i_dev->ifindex != ifindex) |
1622 | continue; | |
1623 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1624 | continue; | |
1625 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1626 | continue; | |
1627 | dst_hold(&rt->u.dst); | |
1628 | break; | |
1629 | } | |
1630 | out: | |
c71099ac | 1631 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1632 | return rt; |
1633 | } | |
1634 | ||
efa2cea0 DL |
1635 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1636 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1637 | struct in6_addr *gwaddr, int ifindex, |
1638 | unsigned pref) | |
1639 | { | |
86872cb5 TG |
1640 | struct fib6_config cfg = { |
1641 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1642 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1643 | .fc_ifindex = ifindex, |
1644 | .fc_dst_len = prefixlen, | |
1645 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1646 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1647 | .fc_nlinfo.pid = 0, |
1648 | .fc_nlinfo.nlh = NULL, | |
1649 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1650 | }; |
1651 | ||
1652 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1653 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1654 | |
e317da96 YH |
1655 | /* We should treat it as a default route if prefix length is 0. */ |
1656 | if (!prefixlen) | |
86872cb5 | 1657 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1658 | |
86872cb5 | 1659 | ip6_route_add(&cfg); |
70ceb4f5 | 1660 | |
efa2cea0 | 1661 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1662 | } |
1663 | #endif | |
1664 | ||
1da177e4 | 1665 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1666 | { |
1da177e4 | 1667 | struct rt6_info *rt; |
c71099ac | 1668 | struct fib6_table *table; |
1da177e4 | 1669 | |
5578689a | 1670 | table = fib6_get_table(dev->nd_net, RT6_TABLE_DFLT); |
c71099ac TG |
1671 | if (table == NULL) |
1672 | return NULL; | |
1da177e4 | 1673 | |
c71099ac | 1674 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1675 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1676 | if (dev == rt->rt6i_dev && |
045927ff | 1677 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1678 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1679 | break; | |
1680 | } | |
1681 | if (rt) | |
1682 | dst_hold(&rt->u.dst); | |
c71099ac | 1683 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1684 | return rt; |
1685 | } | |
1686 | ||
c7dc89c0 FT |
1687 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1688 | ||
1da177e4 | 1689 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1690 | struct net_device *dev, |
1691 | unsigned int pref) | |
1da177e4 | 1692 | { |
86872cb5 TG |
1693 | struct fib6_config cfg = { |
1694 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1695 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1696 | .fc_ifindex = dev->ifindex, |
1697 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1698 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1699 | .fc_nlinfo.pid = 0, |
1700 | .fc_nlinfo.nlh = NULL, | |
1701 | .fc_nlinfo.nl_net = dev->nd_net, | |
86872cb5 | 1702 | }; |
1da177e4 | 1703 | |
86872cb5 | 1704 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1705 | |
86872cb5 | 1706 | ip6_route_add(&cfg); |
1da177e4 | 1707 | |
1da177e4 LT |
1708 | return rt6_get_dflt_router(gwaddr, dev); |
1709 | } | |
1710 | ||
7b4da532 | 1711 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1712 | { |
1713 | struct rt6_info *rt; | |
c71099ac TG |
1714 | struct fib6_table *table; |
1715 | ||
1716 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1717 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1718 | if (table == NULL) |
1719 | return; | |
1da177e4 LT |
1720 | |
1721 | restart: | |
c71099ac | 1722 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1723 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1724 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1725 | dst_hold(&rt->u.dst); | |
c71099ac | 1726 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1727 | ip6_del_rt(rt); |
1da177e4 LT |
1728 | goto restart; |
1729 | } | |
1730 | } | |
c71099ac | 1731 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1732 | } |
1733 | ||
5578689a DL |
1734 | static void rtmsg_to_fib6_config(struct net *net, |
1735 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1736 | struct fib6_config *cfg) |
1737 | { | |
1738 | memset(cfg, 0, sizeof(*cfg)); | |
1739 | ||
1740 | cfg->fc_table = RT6_TABLE_MAIN; | |
1741 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1742 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1743 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1744 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1745 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1746 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1747 | ||
5578689a | 1748 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1749 | |
86872cb5 TG |
1750 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1751 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1752 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1753 | } | |
1754 | ||
5578689a | 1755 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1756 | { |
86872cb5 | 1757 | struct fib6_config cfg; |
1da177e4 LT |
1758 | struct in6_rtmsg rtmsg; |
1759 | int err; | |
1760 | ||
1761 | switch(cmd) { | |
1762 | case SIOCADDRT: /* Add a route */ | |
1763 | case SIOCDELRT: /* Delete a route */ | |
1764 | if (!capable(CAP_NET_ADMIN)) | |
1765 | return -EPERM; | |
1766 | err = copy_from_user(&rtmsg, arg, | |
1767 | sizeof(struct in6_rtmsg)); | |
1768 | if (err) | |
1769 | return -EFAULT; | |
86872cb5 | 1770 | |
5578689a | 1771 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1772 | |
1da177e4 LT |
1773 | rtnl_lock(); |
1774 | switch (cmd) { | |
1775 | case SIOCADDRT: | |
86872cb5 | 1776 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1777 | break; |
1778 | case SIOCDELRT: | |
86872cb5 | 1779 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1780 | break; |
1781 | default: | |
1782 | err = -EINVAL; | |
1783 | } | |
1784 | rtnl_unlock(); | |
1785 | ||
1786 | return err; | |
3ff50b79 | 1787 | } |
1da177e4 LT |
1788 | |
1789 | return -EINVAL; | |
1790 | } | |
1791 | ||
1792 | /* | |
1793 | * Drop the packet on the floor | |
1794 | */ | |
1795 | ||
50eb431d | 1796 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1797 | { |
612f09e8 YH |
1798 | int type; |
1799 | switch (ipstats_mib_noroutes) { | |
1800 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1801 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1802 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1803 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1804 | break; | |
1805 | } | |
1806 | /* FALLTHROUGH */ | |
1807 | case IPSTATS_MIB_OUTNOROUTES: | |
1808 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1809 | break; | |
1810 | } | |
9ce8ade0 | 1811 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1812 | kfree_skb(skb); |
1813 | return 0; | |
1814 | } | |
1815 | ||
9ce8ade0 TG |
1816 | static int ip6_pkt_discard(struct sk_buff *skb) |
1817 | { | |
612f09e8 | 1818 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1819 | } |
1820 | ||
20380731 | 1821 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1822 | { |
1823 | skb->dev = skb->dst->dev; | |
612f09e8 | 1824 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1825 | } |
1826 | ||
6723ab54 DM |
1827 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1828 | ||
9ce8ade0 TG |
1829 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1830 | { | |
612f09e8 | 1831 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1832 | } |
1833 | ||
1834 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1835 | { | |
1836 | skb->dev = skb->dst->dev; | |
612f09e8 | 1837 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1838 | } |
1839 | ||
6723ab54 DM |
1840 | #endif |
1841 | ||
1da177e4 LT |
1842 | /* |
1843 | * Allocate a dst for local (unicast / anycast) address. | |
1844 | */ | |
1845 | ||
1846 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1847 | const struct in6_addr *addr, | |
1848 | int anycast) | |
1849 | { | |
5578689a | 1850 | struct net *net = idev->dev->nd_net; |
1da177e4 LT |
1851 | struct rt6_info *rt = ip6_dst_alloc(); |
1852 | ||
1853 | if (rt == NULL) | |
1854 | return ERR_PTR(-ENOMEM); | |
1855 | ||
5578689a | 1856 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1857 | in6_dev_hold(idev); |
1858 | ||
1859 | rt->u.dst.flags = DST_HOST; | |
1860 | rt->u.dst.input = ip6_input; | |
1861 | rt->u.dst.output = ip6_output; | |
5578689a | 1862 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1863 | rt->rt6i_idev = idev; |
1864 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1865 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1866 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1867 | rt->u.dst.obsolete = -1; | |
1868 | ||
1869 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1870 | if (anycast) |
1871 | rt->rt6i_flags |= RTF_ANYCAST; | |
1872 | else | |
1da177e4 LT |
1873 | rt->rt6i_flags |= RTF_LOCAL; |
1874 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1875 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1876 | dst_free(&rt->u.dst); |
1da177e4 LT |
1877 | return ERR_PTR(-ENOMEM); |
1878 | } | |
1879 | ||
1880 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1881 | rt->rt6i_dst.plen = 128; | |
5578689a | 1882 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1883 | |
1884 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1885 | ||
1886 | return rt; | |
1887 | } | |
1888 | ||
1889 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1890 | { | |
1891 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
bdb3289f | 1892 | rt != ip6_null_entry) { |
1da177e4 LT |
1893 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1894 | return -1; | |
1895 | } | |
1896 | return 0; | |
1897 | } | |
1898 | ||
f3db4851 | 1899 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1900 | { |
f3db4851 | 1901 | fib6_clean_all(net, fib6_ifdown, 0, dev); |
1da177e4 LT |
1902 | } |
1903 | ||
1904 | struct rt6_mtu_change_arg | |
1905 | { | |
1906 | struct net_device *dev; | |
1907 | unsigned mtu; | |
1908 | }; | |
1909 | ||
1910 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1911 | { | |
1912 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1913 | struct inet6_dev *idev; | |
5578689a | 1914 | struct net *net = arg->dev->nd_net; |
1da177e4 LT |
1915 | |
1916 | /* In IPv6 pmtu discovery is not optional, | |
1917 | so that RTAX_MTU lock cannot disable it. | |
1918 | We still use this lock to block changes | |
1919 | caused by addrconf/ndisc. | |
1920 | */ | |
1921 | ||
1922 | idev = __in6_dev_get(arg->dev); | |
1923 | if (idev == NULL) | |
1924 | return 0; | |
1925 | ||
1926 | /* For administrative MTU increase, there is no way to discover | |
1927 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1928 | Since RFC 1981 doesn't include administrative MTU increase | |
1929 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1930 | */ | |
1931 | /* | |
1932 | If new MTU is less than route PMTU, this new MTU will be the | |
1933 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1934 | decreases; if new MTU is greater than route PMTU, and the | |
1935 | old MTU is the lowest MTU in the path, update the route PMTU | |
1936 | to reflect the increase. In this case if the other nodes' MTU | |
1937 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1938 | PMTU discouvery. | |
1939 | */ | |
1940 | if (rt->rt6i_dev == arg->dev && | |
1941 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1942 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1943 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1944 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1945 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 1946 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 1947 | } |
1da177e4 LT |
1948 | return 0; |
1949 | } | |
1950 | ||
1951 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1952 | { | |
c71099ac TG |
1953 | struct rt6_mtu_change_arg arg = { |
1954 | .dev = dev, | |
1955 | .mtu = mtu, | |
1956 | }; | |
1da177e4 | 1957 | |
f3db4851 | 1958 | fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1959 | } |
1960 | ||
ef7c79ed | 1961 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1962 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1963 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1964 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1965 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1966 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1967 | }; | |
1968 | ||
1969 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1970 | struct fib6_config *cfg) | |
1da177e4 | 1971 | { |
86872cb5 TG |
1972 | struct rtmsg *rtm; |
1973 | struct nlattr *tb[RTA_MAX+1]; | |
1974 | int err; | |
1da177e4 | 1975 | |
86872cb5 TG |
1976 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1977 | if (err < 0) | |
1978 | goto errout; | |
1da177e4 | 1979 | |
86872cb5 TG |
1980 | err = -EINVAL; |
1981 | rtm = nlmsg_data(nlh); | |
1982 | memset(cfg, 0, sizeof(*cfg)); | |
1983 | ||
1984 | cfg->fc_table = rtm->rtm_table; | |
1985 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1986 | cfg->fc_src_len = rtm->rtm_src_len; | |
1987 | cfg->fc_flags = RTF_UP; | |
1988 | cfg->fc_protocol = rtm->rtm_protocol; | |
1989 | ||
1990 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1991 | cfg->fc_flags |= RTF_REJECT; | |
1992 | ||
1993 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1994 | cfg->fc_nlinfo.nlh = nlh; | |
2216b483 | 1995 | cfg->fc_nlinfo.nl_net = skb->sk->sk_net; |
86872cb5 TG |
1996 | |
1997 | if (tb[RTA_GATEWAY]) { | |
1998 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1999 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2000 | } |
86872cb5 TG |
2001 | |
2002 | if (tb[RTA_DST]) { | |
2003 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2004 | ||
2005 | if (nla_len(tb[RTA_DST]) < plen) | |
2006 | goto errout; | |
2007 | ||
2008 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2009 | } |
86872cb5 TG |
2010 | |
2011 | if (tb[RTA_SRC]) { | |
2012 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2013 | ||
2014 | if (nla_len(tb[RTA_SRC]) < plen) | |
2015 | goto errout; | |
2016 | ||
2017 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2018 | } |
86872cb5 TG |
2019 | |
2020 | if (tb[RTA_OIF]) | |
2021 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2022 | ||
2023 | if (tb[RTA_PRIORITY]) | |
2024 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2025 | ||
2026 | if (tb[RTA_METRICS]) { | |
2027 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2028 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2029 | } |
86872cb5 TG |
2030 | |
2031 | if (tb[RTA_TABLE]) | |
2032 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2033 | ||
2034 | err = 0; | |
2035 | errout: | |
2036 | return err; | |
1da177e4 LT |
2037 | } |
2038 | ||
c127ea2c | 2039 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2040 | { |
86872cb5 TG |
2041 | struct fib6_config cfg; |
2042 | int err; | |
1da177e4 | 2043 | |
86872cb5 TG |
2044 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2045 | if (err < 0) | |
2046 | return err; | |
2047 | ||
2048 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2049 | } |
2050 | ||
c127ea2c | 2051 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2052 | { |
86872cb5 TG |
2053 | struct fib6_config cfg; |
2054 | int err; | |
1da177e4 | 2055 | |
86872cb5 TG |
2056 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2057 | if (err < 0) | |
2058 | return err; | |
2059 | ||
2060 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2061 | } |
2062 | ||
339bf98f TG |
2063 | static inline size_t rt6_nlmsg_size(void) |
2064 | { | |
2065 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2066 | + nla_total_size(16) /* RTA_SRC */ | |
2067 | + nla_total_size(16) /* RTA_DST */ | |
2068 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2069 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2070 | + nla_total_size(4) /* RTA_TABLE */ | |
2071 | + nla_total_size(4) /* RTA_IIF */ | |
2072 | + nla_total_size(4) /* RTA_OIF */ | |
2073 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2074 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2075 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2076 | } | |
2077 | ||
1da177e4 | 2078 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2079 | struct in6_addr *dst, struct in6_addr *src, |
2080 | int iif, int type, u32 pid, u32 seq, | |
2081 | int prefix, unsigned int flags) | |
1da177e4 LT |
2082 | { |
2083 | struct rtmsg *rtm; | |
2d7202bf | 2084 | struct nlmsghdr *nlh; |
e3703b3d | 2085 | long expires; |
9e762a4a | 2086 | u32 table; |
1da177e4 LT |
2087 | |
2088 | if (prefix) { /* user wants prefix routes only */ | |
2089 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2090 | /* success since this is not a prefix route */ | |
2091 | return 1; | |
2092 | } | |
2093 | } | |
2094 | ||
2d7202bf TG |
2095 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2096 | if (nlh == NULL) | |
26932566 | 2097 | return -EMSGSIZE; |
2d7202bf TG |
2098 | |
2099 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2100 | rtm->rtm_family = AF_INET6; |
2101 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2102 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2103 | rtm->rtm_tos = 0; | |
c71099ac | 2104 | if (rt->rt6i_table) |
9e762a4a | 2105 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2106 | else |
9e762a4a PM |
2107 | table = RT6_TABLE_UNSPEC; |
2108 | rtm->rtm_table = table; | |
2d7202bf | 2109 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2110 | if (rt->rt6i_flags&RTF_REJECT) |
2111 | rtm->rtm_type = RTN_UNREACHABLE; | |
2112 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2113 | rtm->rtm_type = RTN_LOCAL; | |
2114 | else | |
2115 | rtm->rtm_type = RTN_UNICAST; | |
2116 | rtm->rtm_flags = 0; | |
2117 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2118 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2119 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2120 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2121 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2122 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2123 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2124 | rtm->rtm_protocol = RTPROT_RA; | |
2125 | ||
2126 | if (rt->rt6i_flags&RTF_CACHE) | |
2127 | rtm->rtm_flags |= RTM_F_CLONED; | |
2128 | ||
2129 | if (dst) { | |
2d7202bf | 2130 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2131 | rtm->rtm_dst_len = 128; |
1da177e4 | 2132 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2133 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2134 | #ifdef CONFIG_IPV6_SUBTREES |
2135 | if (src) { | |
2d7202bf | 2136 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2137 | rtm->rtm_src_len = 128; |
1da177e4 | 2138 | } else if (rtm->rtm_src_len) |
2d7202bf | 2139 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2140 | #endif |
2141 | if (iif) | |
2d7202bf | 2142 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2143 | else if (dst) { |
2144 | struct in6_addr saddr_buf; | |
5e5f3f0f YH |
2145 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
2146 | dst, &saddr_buf) == 0) | |
2d7202bf | 2147 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2148 | } |
2d7202bf | 2149 | |
1da177e4 | 2150 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2151 | goto nla_put_failure; |
2152 | ||
1da177e4 | 2153 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2154 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2155 | ||
1da177e4 | 2156 | if (rt->u.dst.dev) |
2d7202bf TG |
2157 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2158 | ||
2159 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2160 | |
2161 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2162 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2163 | expires, rt->u.dst.error) < 0) | |
2164 | goto nla_put_failure; | |
2d7202bf TG |
2165 | |
2166 | return nlmsg_end(skb, nlh); | |
2167 | ||
2168 | nla_put_failure: | |
26932566 PM |
2169 | nlmsg_cancel(skb, nlh); |
2170 | return -EMSGSIZE; | |
1da177e4 LT |
2171 | } |
2172 | ||
1b43af54 | 2173 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2174 | { |
2175 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2176 | int prefix; | |
2177 | ||
2d7202bf TG |
2178 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2179 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2180 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2181 | } else | |
2182 | prefix = 0; | |
2183 | ||
2184 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2185 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2186 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2187 | } |
2188 | ||
c127ea2c | 2189 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2190 | { |
b854272b | 2191 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2192 | struct nlattr *tb[RTA_MAX+1]; |
2193 | struct rt6_info *rt; | |
1da177e4 | 2194 | struct sk_buff *skb; |
ab364a6f | 2195 | struct rtmsg *rtm; |
1da177e4 | 2196 | struct flowi fl; |
ab364a6f | 2197 | int err, iif = 0; |
1da177e4 | 2198 | |
ab364a6f TG |
2199 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2200 | if (err < 0) | |
2201 | goto errout; | |
1da177e4 | 2202 | |
ab364a6f | 2203 | err = -EINVAL; |
1da177e4 | 2204 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2205 | |
ab364a6f TG |
2206 | if (tb[RTA_SRC]) { |
2207 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2208 | goto errout; | |
2209 | ||
2210 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2211 | } | |
2212 | ||
2213 | if (tb[RTA_DST]) { | |
2214 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2215 | goto errout; | |
2216 | ||
2217 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2218 | } | |
2219 | ||
2220 | if (tb[RTA_IIF]) | |
2221 | iif = nla_get_u32(tb[RTA_IIF]); | |
2222 | ||
2223 | if (tb[RTA_OIF]) | |
2224 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2225 | |
2226 | if (iif) { | |
2227 | struct net_device *dev; | |
5578689a | 2228 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2229 | if (!dev) { |
2230 | err = -ENODEV; | |
ab364a6f | 2231 | goto errout; |
1da177e4 LT |
2232 | } |
2233 | } | |
2234 | ||
ab364a6f TG |
2235 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2236 | if (skb == NULL) { | |
2237 | err = -ENOBUFS; | |
2238 | goto errout; | |
2239 | } | |
1da177e4 | 2240 | |
ab364a6f TG |
2241 | /* Reserve room for dummy headers, this skb can pass |
2242 | through good chunk of routing engine. | |
2243 | */ | |
459a98ed | 2244 | skb_reset_mac_header(skb); |
ab364a6f | 2245 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2246 | |
ab364a6f | 2247 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2248 | skb->dst = &rt->u.dst; |
2249 | ||
ab364a6f | 2250 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2251 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2252 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2253 | if (err < 0) { |
ab364a6f TG |
2254 | kfree_skb(skb); |
2255 | goto errout; | |
1da177e4 LT |
2256 | } |
2257 | ||
5578689a | 2258 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2259 | errout: |
1da177e4 | 2260 | return err; |
1da177e4 LT |
2261 | } |
2262 | ||
86872cb5 | 2263 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2264 | { |
2265 | struct sk_buff *skb; | |
5578689a | 2266 | struct net *net = info->nl_net; |
528c4ceb DL |
2267 | u32 seq; |
2268 | int err; | |
2269 | ||
2270 | err = -ENOBUFS; | |
2271 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2272 | |
339bf98f | 2273 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2274 | if (skb == NULL) |
2275 | goto errout; | |
2276 | ||
528c4ceb DL |
2277 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2278 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2279 | if (err < 0) { |
2280 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2281 | WARN_ON(err == -EMSGSIZE); | |
2282 | kfree_skb(skb); | |
2283 | goto errout; | |
2284 | } | |
5578689a DL |
2285 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2286 | info->nlh, gfp_any()); | |
21713ebc TG |
2287 | errout: |
2288 | if (err < 0) | |
5578689a | 2289 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2290 | } |
2291 | ||
2292 | /* | |
2293 | * /proc | |
2294 | */ | |
2295 | ||
2296 | #ifdef CONFIG_PROC_FS | |
2297 | ||
2298 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2299 | ||
2300 | struct rt6_proc_arg | |
2301 | { | |
2302 | char *buffer; | |
2303 | int offset; | |
2304 | int length; | |
2305 | int skip; | |
2306 | int len; | |
2307 | }; | |
2308 | ||
2309 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2310 | { | |
33120b30 | 2311 | struct seq_file *m = p_arg; |
1da177e4 | 2312 | |
33120b30 AD |
2313 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2314 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2315 | |
2316 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2317 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2318 | rt->rt6i_src.plen); | |
1da177e4 | 2319 | #else |
33120b30 | 2320 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2321 | #endif |
2322 | ||
2323 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2324 | seq_printf(m, NIP6_SEQFMT, |
2325 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2326 | } else { |
33120b30 | 2327 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2328 | } |
33120b30 AD |
2329 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2330 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2331 | rt->u.dst.__use, rt->rt6i_flags, | |
2332 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2333 | return 0; |
2334 | } | |
2335 | ||
33120b30 | 2336 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2337 | { |
f3db4851 DL |
2338 | struct net *net = (struct net *)m->private; |
2339 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2340 | return 0; |
2341 | } | |
1da177e4 | 2342 | |
33120b30 AD |
2343 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2344 | { | |
f3db4851 DL |
2345 | struct net *net = get_proc_net(inode); |
2346 | if (!net) | |
2347 | return -ENXIO; | |
2348 | return single_open(file, ipv6_route_show, net); | |
2349 | } | |
2350 | ||
2351 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2352 | { | |
2353 | struct seq_file *seq = file->private_data; | |
2354 | struct net *net = seq->private; | |
2355 | put_net(net); | |
2356 | return single_release(inode, file); | |
1da177e4 LT |
2357 | } |
2358 | ||
33120b30 AD |
2359 | static const struct file_operations ipv6_route_proc_fops = { |
2360 | .owner = THIS_MODULE, | |
2361 | .open = ipv6_route_open, | |
2362 | .read = seq_read, | |
2363 | .llseek = seq_lseek, | |
f3db4851 | 2364 | .release = ipv6_route_release, |
33120b30 AD |
2365 | }; |
2366 | ||
1da177e4 LT |
2367 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2368 | { | |
69ddb805 | 2369 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2370 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2371 | net->ipv6.rt6_stats->fib_nodes, |
2372 | net->ipv6.rt6_stats->fib_route_nodes, | |
2373 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2374 | net->ipv6.rt6_stats->fib_rt_entries, | |
2375 | net->ipv6.rt6_stats->fib_rt_cache, | |
c572872f | 2376 | atomic_read(&ip6_dst_ops.entries), |
69ddb805 | 2377 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2378 | |
2379 | return 0; | |
2380 | } | |
2381 | ||
2382 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2383 | { | |
69ddb805 DL |
2384 | struct net *net = get_proc_net(inode); |
2385 | return single_open(file, rt6_stats_seq_show, net); | |
2386 | } | |
2387 | ||
2388 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2389 | { | |
2390 | struct seq_file *seq = file->private_data; | |
2391 | struct net *net = (struct net *)seq->private; | |
2392 | put_net(net); | |
2393 | return single_release(inode, file); | |
1da177e4 LT |
2394 | } |
2395 | ||
9a32144e | 2396 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2397 | .owner = THIS_MODULE, |
2398 | .open = rt6_stats_seq_open, | |
2399 | .read = seq_read, | |
2400 | .llseek = seq_lseek, | |
69ddb805 | 2401 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2402 | }; |
2403 | #endif /* CONFIG_PROC_FS */ | |
2404 | ||
2405 | #ifdef CONFIG_SYSCTL | |
2406 | ||
1da177e4 LT |
2407 | static |
2408 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2409 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2410 | { | |
5b7c931d DL |
2411 | struct net *net = current->nsproxy->net_ns; |
2412 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2413 | if (write) { |
2414 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2415 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2416 | return 0; |
2417 | } else | |
2418 | return -EINVAL; | |
2419 | } | |
2420 | ||
760f2d01 | 2421 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2422 | { |
1da177e4 | 2423 | .procname = "flush", |
4990509f | 2424 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2425 | .maxlen = sizeof(int), |
89c8b3a1 | 2426 | .mode = 0200, |
1ab1457c | 2427 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2428 | }, |
2429 | { | |
2430 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2431 | .procname = "gc_thresh", | |
1ab1457c | 2432 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2433 | .maxlen = sizeof(int), |
2434 | .mode = 0644, | |
1ab1457c | 2435 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2436 | }, |
2437 | { | |
2438 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2439 | .procname = "max_size", | |
4990509f | 2440 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2441 | .maxlen = sizeof(int), |
2442 | .mode = 0644, | |
1ab1457c | 2443 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2444 | }, |
2445 | { | |
2446 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2447 | .procname = "gc_min_interval", | |
4990509f | 2448 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2449 | .maxlen = sizeof(int), |
2450 | .mode = 0644, | |
1ab1457c | 2451 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2452 | .strategy = &sysctl_jiffies, |
2453 | }, | |
2454 | { | |
2455 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2456 | .procname = "gc_timeout", | |
4990509f | 2457 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2458 | .maxlen = sizeof(int), |
2459 | .mode = 0644, | |
1ab1457c | 2460 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2461 | .strategy = &sysctl_jiffies, |
2462 | }, | |
2463 | { | |
2464 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2465 | .procname = "gc_interval", | |
4990509f | 2466 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2467 | .maxlen = sizeof(int), |
2468 | .mode = 0644, | |
1ab1457c | 2469 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2470 | .strategy = &sysctl_jiffies, |
2471 | }, | |
2472 | { | |
2473 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2474 | .procname = "gc_elasticity", | |
4990509f | 2475 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2476 | .maxlen = sizeof(int), |
2477 | .mode = 0644, | |
1ab1457c | 2478 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2479 | .strategy = &sysctl_jiffies, |
2480 | }, | |
2481 | { | |
2482 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2483 | .procname = "mtu_expires", | |
4990509f | 2484 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2485 | .maxlen = sizeof(int), |
2486 | .mode = 0644, | |
1ab1457c | 2487 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2488 | .strategy = &sysctl_jiffies, |
2489 | }, | |
2490 | { | |
2491 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2492 | .procname = "min_adv_mss", | |
4990509f | 2493 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2494 | .maxlen = sizeof(int), |
2495 | .mode = 0644, | |
1ab1457c | 2496 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2497 | .strategy = &sysctl_jiffies, |
2498 | }, | |
2499 | { | |
2500 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2501 | .procname = "gc_min_interval_ms", | |
4990509f | 2502 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2503 | .maxlen = sizeof(int), |
2504 | .mode = 0644, | |
1ab1457c | 2505 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2506 | .strategy = &sysctl_ms_jiffies, |
2507 | }, | |
2508 | { .ctl_name = 0 } | |
2509 | }; | |
2510 | ||
760f2d01 DL |
2511 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2512 | { | |
2513 | struct ctl_table *table; | |
2514 | ||
2515 | table = kmemdup(ipv6_route_table_template, | |
2516 | sizeof(ipv6_route_table_template), | |
2517 | GFP_KERNEL); | |
5ee09105 YH |
2518 | |
2519 | if (table) { | |
2520 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
2521 | /* table[1].data will be handled when we have | |
2522 | routes per namespace */ | |
2523 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; | |
2524 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2525 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2526 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2527 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2528 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2529 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2530 | } | |
2531 | ||
760f2d01 DL |
2532 | return table; |
2533 | } | |
1da177e4 LT |
2534 | #endif |
2535 | ||
cdb18761 DL |
2536 | static int ip6_route_net_init(struct net *net) |
2537 | { | |
2538 | #ifdef CONFIG_PROC_FS | |
2539 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2540 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2541 | #endif | |
2542 | return 0; | |
2543 | } | |
2544 | ||
2545 | static void ip6_route_net_exit(struct net *net) | |
2546 | { | |
2547 | #ifdef CONFIG_PROC_FS | |
2548 | proc_net_remove(net, "ipv6_route"); | |
2549 | proc_net_remove(net, "rt6_stats"); | |
2550 | #endif | |
5578689a | 2551 | rt6_ifdown(net, NULL); |
cdb18761 DL |
2552 | } |
2553 | ||
2554 | static struct pernet_operations ip6_route_net_ops = { | |
2555 | .init = ip6_route_net_init, | |
2556 | .exit = ip6_route_net_exit, | |
2557 | }; | |
2558 | ||
433d49c3 | 2559 | int __init ip6_route_init(void) |
1da177e4 | 2560 | { |
433d49c3 DL |
2561 | int ret; |
2562 | ||
e5d679f3 AD |
2563 | ip6_dst_ops.kmem_cachep = |
2564 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
f845ab6b DL |
2565 | SLAB_HWCACHE_ALIGN, NULL); |
2566 | if (!ip6_dst_ops.kmem_cachep) | |
2567 | return -ENOMEM; | |
2568 | ||
14e50e57 DM |
2569 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2570 | ||
bdb3289f DL |
2571 | ret = -ENOMEM; |
2572 | ip6_null_entry = kmemdup(&ip6_null_entry_template, | |
2573 | sizeof(*ip6_null_entry), GFP_KERNEL); | |
2574 | if (!ip6_null_entry) | |
2575 | goto out_kmem_cache; | |
2576 | ip6_null_entry->u.dst.path = (struct dst_entry *)ip6_null_entry; | |
2577 | ||
2578 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2579 | ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2580 | sizeof(*ip6_prohibit_entry), GFP_KERNEL); | |
2581 | if (!ip6_prohibit_entry) | |
2582 | goto out_ip6_null_entry; | |
2583 | ip6_prohibit_entry->u.dst.path = (struct dst_entry *)ip6_prohibit_entry; | |
2584 | ||
2585 | ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2586 | sizeof(*ip6_blk_hole_entry), GFP_KERNEL); | |
2587 | if (!ip6_blk_hole_entry) | |
2588 | goto out_ip6_prohibit_entry; | |
2589 | ip6_blk_hole_entry->u.dst.path = (struct dst_entry *)ip6_blk_hole_entry; | |
2590 | #endif | |
2591 | ||
433d49c3 DL |
2592 | ret = fib6_init(); |
2593 | if (ret) | |
bdb3289f | 2594 | goto out_ip6_blk_hole_entry; |
433d49c3 | 2595 | |
433d49c3 DL |
2596 | ret = xfrm6_init(); |
2597 | if (ret) | |
cdb18761 | 2598 | goto out_fib6_init; |
c35b7e72 | 2599 | |
433d49c3 DL |
2600 | ret = fib6_rules_init(); |
2601 | if (ret) | |
2602 | goto xfrm6_init; | |
7e5449c2 | 2603 | |
433d49c3 DL |
2604 | ret = -ENOBUFS; |
2605 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2606 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2607 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2608 | goto fib6_rules_init; | |
c127ea2c | 2609 | |
cdb18761 DL |
2610 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2611 | if (ret) | |
2612 | goto fib6_rules_init; | |
433d49c3 DL |
2613 | out: |
2614 | return ret; | |
2615 | ||
2616 | fib6_rules_init: | |
433d49c3 DL |
2617 | fib6_rules_cleanup(); |
2618 | xfrm6_init: | |
433d49c3 | 2619 | xfrm6_fini(); |
433d49c3 | 2620 | out_fib6_init: |
433d49c3 | 2621 | fib6_gc_cleanup(); |
bdb3289f DL |
2622 | out_ip6_blk_hole_entry: |
2623 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2624 | kfree(ip6_blk_hole_entry); | |
2625 | out_ip6_prohibit_entry: | |
2626 | kfree(ip6_prohibit_entry); | |
2627 | out_ip6_null_entry: | |
2628 | #endif | |
2629 | kfree(ip6_null_entry); | |
433d49c3 DL |
2630 | out_kmem_cache: |
2631 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2632 | goto out; | |
1da177e4 LT |
2633 | } |
2634 | ||
2635 | void ip6_route_cleanup(void) | |
2636 | { | |
cdb18761 | 2637 | unregister_pernet_subsys(&ip6_route_net_ops); |
101367c2 | 2638 | fib6_rules_cleanup(); |
1da177e4 | 2639 | xfrm6_fini(); |
1da177e4 LT |
2640 | fib6_gc_cleanup(); |
2641 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
bdb3289f DL |
2642 | |
2643 | kfree(ip6_null_entry); | |
2644 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2645 | kfree(ip6_prohibit_entry); | |
2646 | kfree(ip6_blk_hole_entry); | |
2647 | #endif | |
1da177e4 | 2648 | } |