Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
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 | ||
9a7ec3a9 | 100 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 LT |
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, | |
1da177e4 LT |
140 | } |
141 | }, | |
142 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
143 | .rt6i_metric = ~(u32) 0, | |
144 | .rt6i_ref = ATOMIC_INIT(1), | |
145 | }; | |
146 | ||
101367c2 TG |
147 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
148 | ||
6723ab54 DM |
149 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
150 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 151 | |
bdb3289f | 152 | struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
153 | .u = { |
154 | .dst = { | |
155 | .__refcnt = ATOMIC_INIT(1), | |
156 | .__use = 1, | |
101367c2 TG |
157 | .obsolete = -1, |
158 | .error = -EACCES, | |
159 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
160 | .input = ip6_pkt_prohibit, |
161 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
162 | } |
163 | }, | |
164 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
165 | .rt6i_metric = ~(u32) 0, | |
166 | .rt6i_ref = ATOMIC_INIT(1), | |
167 | }; | |
168 | ||
bdb3289f | 169 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
170 | .u = { |
171 | .dst = { | |
172 | .__refcnt = ATOMIC_INIT(1), | |
173 | .__use = 1, | |
101367c2 TG |
174 | .obsolete = -1, |
175 | .error = -EINVAL, | |
176 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
177 | .input = dst_discard, |
178 | .output = dst_discard, | |
101367c2 TG |
179 | } |
180 | }, | |
181 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
182 | .rt6i_metric = ~(u32) 0, | |
183 | .rt6i_ref = ATOMIC_INIT(1), | |
184 | }; | |
185 | ||
186 | #endif | |
187 | ||
1da177e4 | 188 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 189 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 190 | { |
f2fc6a54 | 191 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
192 | } |
193 | ||
194 | static void ip6_dst_destroy(struct dst_entry *dst) | |
195 | { | |
196 | struct rt6_info *rt = (struct rt6_info *)dst; | |
197 | struct inet6_dev *idev = rt->rt6i_idev; | |
198 | ||
199 | if (idev != NULL) { | |
200 | rt->rt6i_idev = NULL; | |
201 | in6_dev_put(idev); | |
1ab1457c | 202 | } |
1da177e4 LT |
203 | } |
204 | ||
205 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
206 | int how) | |
207 | { | |
208 | struct rt6_info *rt = (struct rt6_info *)dst; | |
209 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
210 | struct net_device *loopback_dev = |
211 | dev->nd_net->loopback_dev; | |
1da177e4 | 212 | |
5a3e55d6 DL |
213 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
214 | struct inet6_dev *loopback_idev = | |
215 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
216 | if (loopback_idev != NULL) { |
217 | rt->rt6i_idev = loopback_idev; | |
218 | in6_dev_put(idev); | |
219 | } | |
220 | } | |
221 | } | |
222 | ||
223 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
224 | { | |
225 | return (rt->rt6i_flags & RTF_EXPIRES && | |
226 | time_after(jiffies, rt->rt6i_expires)); | |
227 | } | |
228 | ||
c71099ac TG |
229 | static inline int rt6_need_strict(struct in6_addr *daddr) |
230 | { | |
231 | return (ipv6_addr_type(daddr) & | |
232 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
233 | } | |
234 | ||
1da177e4 | 235 | /* |
c71099ac | 236 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
237 | */ |
238 | ||
8ed67789 DL |
239 | static inline struct rt6_info *rt6_device_match(struct net *net, |
240 | struct rt6_info *rt, | |
1da177e4 LT |
241 | int oif, |
242 | int strict) | |
243 | { | |
244 | struct rt6_info *local = NULL; | |
245 | struct rt6_info *sprt; | |
246 | ||
247 | if (oif) { | |
7cc48263 | 248 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
249 | struct net_device *dev = sprt->rt6i_dev; |
250 | if (dev->ifindex == oif) | |
251 | return sprt; | |
252 | if (dev->flags & IFF_LOOPBACK) { | |
253 | if (sprt->rt6i_idev == NULL || | |
254 | sprt->rt6i_idev->dev->ifindex != oif) { | |
255 | if (strict && oif) | |
256 | continue; | |
1ab1457c | 257 | if (local && (!oif || |
1da177e4 LT |
258 | local->rt6i_idev->dev->ifindex == oif)) |
259 | continue; | |
260 | } | |
261 | local = sprt; | |
262 | } | |
263 | } | |
264 | ||
265 | if (local) | |
266 | return local; | |
267 | ||
268 | if (strict) | |
8ed67789 | 269 | return net->ipv6.ip6_null_entry; |
1da177e4 LT |
270 | } |
271 | return rt; | |
272 | } | |
273 | ||
27097255 YH |
274 | #ifdef CONFIG_IPV6_ROUTER_PREF |
275 | static void rt6_probe(struct rt6_info *rt) | |
276 | { | |
277 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
278 | /* | |
279 | * Okay, this does not seem to be appropriate | |
280 | * for now, however, we need to check if it | |
281 | * is really so; aka Router Reachability Probing. | |
282 | * | |
283 | * Router Reachability Probe MUST be rate-limited | |
284 | * to no more than one per minute. | |
285 | */ | |
286 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
287 | return; | |
288 | read_lock_bh(&neigh->lock); | |
289 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 290 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
291 | struct in6_addr mcaddr; |
292 | struct in6_addr *target; | |
293 | ||
294 | neigh->updated = jiffies; | |
295 | read_unlock_bh(&neigh->lock); | |
296 | ||
297 | target = (struct in6_addr *)&neigh->primary_key; | |
298 | addrconf_addr_solict_mult(target, &mcaddr); | |
299 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
300 | } else | |
301 | read_unlock_bh(&neigh->lock); | |
302 | } | |
303 | #else | |
304 | static inline void rt6_probe(struct rt6_info *rt) | |
305 | { | |
306 | return; | |
307 | } | |
308 | #endif | |
309 | ||
1da177e4 | 310 | /* |
554cfb7e | 311 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 312 | */ |
b6f99a21 | 313 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
314 | { |
315 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 316 | if (!oif || dev->ifindex == oif) |
554cfb7e | 317 | return 2; |
161980f4 DM |
318 | if ((dev->flags & IFF_LOOPBACK) && |
319 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
320 | return 1; | |
321 | return 0; | |
554cfb7e | 322 | } |
1da177e4 | 323 | |
b6f99a21 | 324 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 325 | { |
554cfb7e | 326 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 327 | int m; |
4d0c5911 YH |
328 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
329 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
330 | m = 1; | |
331 | else if (neigh) { | |
554cfb7e YH |
332 | read_lock_bh(&neigh->lock); |
333 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 334 | m = 2; |
398bcbeb YH |
335 | #ifdef CONFIG_IPV6_ROUTER_PREF |
336 | else if (neigh->nud_state & NUD_FAILED) | |
337 | m = 0; | |
338 | #endif | |
339 | else | |
ea73ee23 | 340 | m = 1; |
554cfb7e | 341 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
342 | } else |
343 | m = 0; | |
554cfb7e | 344 | return m; |
1da177e4 LT |
345 | } |
346 | ||
554cfb7e YH |
347 | static int rt6_score_route(struct rt6_info *rt, int oif, |
348 | int strict) | |
1da177e4 | 349 | { |
4d0c5911 | 350 | int m, n; |
1ab1457c | 351 | |
4d0c5911 | 352 | m = rt6_check_dev(rt, oif); |
77d16f45 | 353 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 354 | return -1; |
ebacaaa0 YH |
355 | #ifdef CONFIG_IPV6_ROUTER_PREF |
356 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
357 | #endif | |
4d0c5911 | 358 | n = rt6_check_neigh(rt); |
557e92ef | 359 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
360 | return -1; |
361 | return m; | |
362 | } | |
363 | ||
f11e6659 DM |
364 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
365 | int *mpri, struct rt6_info *match) | |
554cfb7e | 366 | { |
f11e6659 DM |
367 | int m; |
368 | ||
369 | if (rt6_check_expired(rt)) | |
370 | goto out; | |
371 | ||
372 | m = rt6_score_route(rt, oif, strict); | |
373 | if (m < 0) | |
374 | goto out; | |
375 | ||
376 | if (m > *mpri) { | |
377 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
378 | rt6_probe(match); | |
379 | *mpri = m; | |
380 | match = rt; | |
381 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
382 | rt6_probe(rt); | |
383 | } | |
384 | ||
385 | out: | |
386 | return match; | |
387 | } | |
388 | ||
389 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
390 | struct rt6_info *rr_head, | |
391 | u32 metric, int oif, int strict) | |
392 | { | |
393 | struct rt6_info *rt, *match; | |
554cfb7e | 394 | int mpri = -1; |
1da177e4 | 395 | |
f11e6659 DM |
396 | match = NULL; |
397 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
398 | rt = rt->u.dst.rt6_next) | |
399 | match = find_match(rt, oif, strict, &mpri, match); | |
400 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
401 | rt = rt->u.dst.rt6_next) | |
402 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 403 | |
f11e6659 DM |
404 | return match; |
405 | } | |
1da177e4 | 406 | |
f11e6659 DM |
407 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
408 | { | |
409 | struct rt6_info *match, *rt0; | |
8ed67789 | 410 | struct net *net; |
1da177e4 | 411 | |
f11e6659 DM |
412 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
413 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 414 | |
f11e6659 DM |
415 | rt0 = fn->rr_ptr; |
416 | if (!rt0) | |
417 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 418 | |
f11e6659 | 419 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 420 | |
554cfb7e | 421 | if (!match && |
f11e6659 DM |
422 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
423 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
424 | ||
554cfb7e | 425 | /* no entries matched; do round-robin */ |
f11e6659 DM |
426 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
427 | next = fn->leaf; | |
428 | ||
429 | if (next != rt0) | |
430 | fn->rr_ptr = next; | |
1da177e4 | 431 | } |
1da177e4 | 432 | |
f11e6659 DM |
433 | RT6_TRACE("%s() => %p\n", |
434 | __FUNCTION__, match); | |
1da177e4 | 435 | |
8ed67789 DL |
436 | net = rt0->rt6i_dev->nd_net; |
437 | return (match ? match : net->ipv6.ip6_null_entry); | |
1da177e4 LT |
438 | } |
439 | ||
70ceb4f5 YH |
440 | #ifdef CONFIG_IPV6_ROUTE_INFO |
441 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
442 | struct in6_addr *gwaddr) | |
443 | { | |
efa2cea0 | 444 | struct net *net = dev->nd_net; |
70ceb4f5 YH |
445 | struct route_info *rinfo = (struct route_info *) opt; |
446 | struct in6_addr prefix_buf, *prefix; | |
447 | unsigned int pref; | |
448 | u32 lifetime; | |
449 | struct rt6_info *rt; | |
450 | ||
451 | if (len < sizeof(struct route_info)) { | |
452 | return -EINVAL; | |
453 | } | |
454 | ||
455 | /* Sanity check for prefix_len and length */ | |
456 | if (rinfo->length > 3) { | |
457 | return -EINVAL; | |
458 | } else if (rinfo->prefix_len > 128) { | |
459 | return -EINVAL; | |
460 | } else if (rinfo->prefix_len > 64) { | |
461 | if (rinfo->length < 2) { | |
462 | return -EINVAL; | |
463 | } | |
464 | } else if (rinfo->prefix_len > 0) { | |
465 | if (rinfo->length < 1) { | |
466 | return -EINVAL; | |
467 | } | |
468 | } | |
469 | ||
470 | pref = rinfo->route_pref; | |
471 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
472 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
473 | ||
e69a4adc | 474 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
475 | if (lifetime == 0xffffffff) { |
476 | /* infinity */ | |
477 | } else if (lifetime > 0x7fffffff/HZ) { | |
478 | /* Avoid arithmetic overflow */ | |
479 | lifetime = 0x7fffffff/HZ - 1; | |
480 | } | |
481 | ||
482 | if (rinfo->length == 3) | |
483 | prefix = (struct in6_addr *)rinfo->prefix; | |
484 | else { | |
485 | /* this function is safe */ | |
486 | ipv6_addr_prefix(&prefix_buf, | |
487 | (struct in6_addr *)rinfo->prefix, | |
488 | rinfo->prefix_len); | |
489 | prefix = &prefix_buf; | |
490 | } | |
491 | ||
efa2cea0 DL |
492 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
493 | dev->ifindex); | |
70ceb4f5 YH |
494 | |
495 | if (rt && !lifetime) { | |
e0a1ad73 | 496 | ip6_del_rt(rt); |
70ceb4f5 YH |
497 | rt = NULL; |
498 | } | |
499 | ||
500 | if (!rt && lifetime) | |
efa2cea0 | 501 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
502 | pref); |
503 | else if (rt) | |
504 | rt->rt6i_flags = RTF_ROUTEINFO | | |
505 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
506 | ||
507 | if (rt) { | |
508 | if (lifetime == 0xffffffff) { | |
509 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
510 | } else { | |
511 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
512 | rt->rt6i_flags |= RTF_EXPIRES; | |
513 | } | |
514 | dst_release(&rt->u.dst); | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | #endif | |
519 | ||
8ed67789 | 520 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 521 | do { \ |
8ed67789 | 522 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 523 | struct fib6_node *pn; \ |
e0eda7bb | 524 | while (1) { \ |
982f56f3 YH |
525 | if (fn->fn_flags & RTN_TL_ROOT) \ |
526 | goto out; \ | |
527 | pn = fn->parent; \ | |
528 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 529 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
530 | else \ |
531 | fn = pn; \ | |
532 | if (fn->fn_flags & RTN_RTINFO) \ | |
533 | goto restart; \ | |
c71099ac | 534 | } \ |
c71099ac | 535 | } \ |
982f56f3 | 536 | } while(0) |
c71099ac | 537 | |
8ed67789 DL |
538 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
539 | struct fib6_table *table, | |
c71099ac | 540 | struct flowi *fl, int flags) |
1da177e4 LT |
541 | { |
542 | struct fib6_node *fn; | |
543 | struct rt6_info *rt; | |
544 | ||
c71099ac TG |
545 | read_lock_bh(&table->tb6_lock); |
546 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
547 | restart: | |
548 | rt = fn->leaf; | |
8ed67789 DL |
549 | rt = rt6_device_match(net, rt, fl->oif, flags); |
550 | BACKTRACK(net, &fl->fl6_src); | |
c71099ac | 551 | out: |
03f49f34 | 552 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 553 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
554 | return rt; |
555 | ||
556 | } | |
557 | ||
606a2b48 DL |
558 | struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr, |
559 | struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
560 | { |
561 | struct flowi fl = { | |
562 | .oif = oif, | |
563 | .nl_u = { | |
564 | .ip6_u = { | |
565 | .daddr = *daddr, | |
c71099ac TG |
566 | }, |
567 | }, | |
568 | }; | |
569 | struct dst_entry *dst; | |
77d16f45 | 570 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 571 | |
adaa70bb TG |
572 | if (saddr) { |
573 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
574 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
575 | } | |
576 | ||
606a2b48 | 577 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
578 | if (dst->error == 0) |
579 | return (struct rt6_info *) dst; | |
580 | ||
581 | dst_release(dst); | |
582 | ||
1da177e4 LT |
583 | return NULL; |
584 | } | |
585 | ||
7159039a YH |
586 | EXPORT_SYMBOL(rt6_lookup); |
587 | ||
c71099ac | 588 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
589 | It takes new route entry, the addition fails by any reason the |
590 | route is freed. In any case, if caller does not hold it, it may | |
591 | be destroyed. | |
592 | */ | |
593 | ||
86872cb5 | 594 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
595 | { |
596 | int err; | |
c71099ac | 597 | struct fib6_table *table; |
1da177e4 | 598 | |
c71099ac TG |
599 | table = rt->rt6i_table; |
600 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 601 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 602 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
603 | |
604 | return err; | |
605 | } | |
606 | ||
40e22e8f TG |
607 | int ip6_ins_rt(struct rt6_info *rt) |
608 | { | |
4d1169c1 | 609 | struct nl_info info = { |
5578689a | 610 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 611 | }; |
528c4ceb | 612 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
613 | } |
614 | ||
95a9a5ba YH |
615 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
616 | struct in6_addr *saddr) | |
1da177e4 | 617 | { |
1da177e4 LT |
618 | struct rt6_info *rt; |
619 | ||
620 | /* | |
621 | * Clone the route. | |
622 | */ | |
623 | ||
624 | rt = ip6_rt_copy(ort); | |
625 | ||
626 | if (rt) { | |
58c4fb86 YH |
627 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
628 | if (rt->rt6i_dst.plen != 128 && | |
629 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
630 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 631 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 632 | } |
1da177e4 | 633 | |
58c4fb86 | 634 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
635 | rt->rt6i_dst.plen = 128; |
636 | rt->rt6i_flags |= RTF_CACHE; | |
637 | rt->u.dst.flags |= DST_HOST; | |
638 | ||
639 | #ifdef CONFIG_IPV6_SUBTREES | |
640 | if (rt->rt6i_src.plen && saddr) { | |
641 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
642 | rt->rt6i_src.plen = 128; | |
643 | } | |
644 | #endif | |
645 | ||
646 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
647 | ||
95a9a5ba | 648 | } |
1da177e4 | 649 | |
95a9a5ba YH |
650 | return rt; |
651 | } | |
1da177e4 | 652 | |
299d9939 YH |
653 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
654 | { | |
655 | struct rt6_info *rt = ip6_rt_copy(ort); | |
656 | if (rt) { | |
657 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
658 | rt->rt6i_dst.plen = 128; | |
659 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
660 | rt->u.dst.flags |= DST_HOST; |
661 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
662 | } | |
663 | return rt; | |
664 | } | |
665 | ||
8ed67789 DL |
666 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
667 | struct flowi *fl, int flags) | |
1da177e4 LT |
668 | { |
669 | struct fib6_node *fn; | |
519fbd87 | 670 | struct rt6_info *rt, *nrt; |
c71099ac | 671 | int strict = 0; |
1da177e4 | 672 | int attempts = 3; |
519fbd87 | 673 | int err; |
ea659e07 | 674 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 675 | |
77d16f45 | 676 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
677 | |
678 | relookup: | |
c71099ac | 679 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 680 | |
8238dd06 | 681 | restart_2: |
c71099ac | 682 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
683 | |
684 | restart: | |
4acad72d | 685 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
686 | |
687 | BACKTRACK(net, &fl->fl6_src); | |
688 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 689 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 690 | goto out; |
1da177e4 | 691 | |
fb9de91e | 692 | dst_hold(&rt->u.dst); |
c71099ac | 693 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 694 | |
519fbd87 | 695 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 696 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
697 | else { |
698 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 699 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
700 | #else |
701 | goto out2; | |
702 | #endif | |
703 | } | |
e40cf353 | 704 | |
519fbd87 | 705 | dst_release(&rt->u.dst); |
8ed67789 | 706 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 707 | |
519fbd87 YH |
708 | dst_hold(&rt->u.dst); |
709 | if (nrt) { | |
40e22e8f | 710 | err = ip6_ins_rt(nrt); |
519fbd87 | 711 | if (!err) |
1da177e4 | 712 | goto out2; |
1da177e4 | 713 | } |
1da177e4 | 714 | |
519fbd87 YH |
715 | if (--attempts <= 0) |
716 | goto out2; | |
717 | ||
718 | /* | |
c71099ac | 719 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
720 | * released someone could insert this route. Relookup. |
721 | */ | |
722 | dst_release(&rt->u.dst); | |
723 | goto relookup; | |
724 | ||
725 | out: | |
8238dd06 YH |
726 | if (reachable) { |
727 | reachable = 0; | |
728 | goto restart_2; | |
729 | } | |
519fbd87 | 730 | dst_hold(&rt->u.dst); |
c71099ac | 731 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
732 | out2: |
733 | rt->u.dst.lastuse = jiffies; | |
734 | rt->u.dst.__use++; | |
c71099ac TG |
735 | |
736 | return rt; | |
1da177e4 LT |
737 | } |
738 | ||
8ed67789 | 739 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
740 | struct flowi *fl, int flags) |
741 | { | |
8ed67789 | 742 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
743 | } |
744 | ||
c71099ac TG |
745 | void ip6_route_input(struct sk_buff *skb) |
746 | { | |
0660e03f | 747 | struct ipv6hdr *iph = ipv6_hdr(skb); |
5578689a | 748 | struct net *net = skb->dev->nd_net; |
adaa70bb | 749 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
750 | struct flowi fl = { |
751 | .iif = skb->dev->ifindex, | |
752 | .nl_u = { | |
753 | .ip6_u = { | |
754 | .daddr = iph->daddr, | |
755 | .saddr = iph->saddr, | |
90bcaf7b | 756 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
757 | }, |
758 | }, | |
1ab1457c | 759 | .mark = skb->mark, |
c71099ac TG |
760 | .proto = iph->nexthdr, |
761 | }; | |
adaa70bb TG |
762 | |
763 | if (rt6_need_strict(&iph->daddr)) | |
764 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 765 | |
5578689a | 766 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
767 | } |
768 | ||
8ed67789 | 769 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 770 | struct flowi *fl, int flags) |
1da177e4 | 771 | { |
8ed67789 | 772 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
773 | } |
774 | ||
775 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
776 | { | |
777 | int flags = 0; | |
778 | ||
779 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 780 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 781 | |
adaa70bb TG |
782 | if (!ipv6_addr_any(&fl->fl6_src)) |
783 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
784 | ||
58f09b78 | 785 | return fib6_rule_lookup(&init_net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
786 | } |
787 | ||
7159039a | 788 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 789 | |
14e50e57 DM |
790 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
791 | { | |
792 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
793 | struct rt6_info *rt = (struct rt6_info *) | |
794 | dst_alloc(&ip6_dst_blackhole_ops); | |
795 | struct dst_entry *new = NULL; | |
796 | ||
797 | if (rt) { | |
798 | new = &rt->u.dst; | |
799 | ||
800 | atomic_set(&new->__refcnt, 1); | |
801 | new->__use = 1; | |
352e512c HX |
802 | new->input = dst_discard; |
803 | new->output = dst_discard; | |
14e50e57 DM |
804 | |
805 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
806 | new->dev = ort->u.dst.dev; | |
807 | if (new->dev) | |
808 | dev_hold(new->dev); | |
809 | rt->rt6i_idev = ort->rt6i_idev; | |
810 | if (rt->rt6i_idev) | |
811 | in6_dev_hold(rt->rt6i_idev); | |
812 | rt->rt6i_expires = 0; | |
813 | ||
814 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
815 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
816 | rt->rt6i_metric = 0; | |
817 | ||
818 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
819 | #ifdef CONFIG_IPV6_SUBTREES | |
820 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
821 | #endif | |
822 | ||
823 | dst_free(new); | |
824 | } | |
825 | ||
826 | dst_release(*dstp); | |
827 | *dstp = new; | |
828 | return (new ? 0 : -ENOMEM); | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
831 | ||
1da177e4 LT |
832 | /* |
833 | * Destination cache support functions | |
834 | */ | |
835 | ||
836 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
837 | { | |
838 | struct rt6_info *rt; | |
839 | ||
840 | rt = (struct rt6_info *) dst; | |
841 | ||
842 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
843 | return dst; | |
844 | ||
845 | return NULL; | |
846 | } | |
847 | ||
848 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
849 | { | |
850 | struct rt6_info *rt = (struct rt6_info *) dst; | |
851 | ||
852 | if (rt) { | |
853 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 854 | ip6_del_rt(rt); |
1da177e4 LT |
855 | else |
856 | dst_release(dst); | |
857 | } | |
858 | return NULL; | |
859 | } | |
860 | ||
861 | static void ip6_link_failure(struct sk_buff *skb) | |
862 | { | |
863 | struct rt6_info *rt; | |
864 | ||
865 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
866 | ||
867 | rt = (struct rt6_info *) skb->dst; | |
868 | if (rt) { | |
869 | if (rt->rt6i_flags&RTF_CACHE) { | |
870 | dst_set_expires(&rt->u.dst, 0); | |
871 | rt->rt6i_flags |= RTF_EXPIRES; | |
872 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
873 | rt->rt6i_node->fn_sernum = -1; | |
874 | } | |
875 | } | |
876 | ||
877 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
878 | { | |
879 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
880 | ||
881 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
882 | rt6->rt6i_flags |= RTF_MODIFIED; | |
883 | if (mtu < IPV6_MIN_MTU) { | |
884 | mtu = IPV6_MIN_MTU; | |
885 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
886 | } | |
887 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 888 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
889 | } |
890 | } | |
891 | ||
1da177e4 LT |
892 | static int ipv6_get_mtu(struct net_device *dev); |
893 | ||
5578689a | 894 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
895 | { |
896 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
897 | ||
5578689a DL |
898 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
899 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
900 | |
901 | /* | |
1ab1457c YH |
902 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
903 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
904 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
905 | * rely only on pmtu discovery" |
906 | */ | |
907 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
908 | mtu = IPV6_MAXPLEN; | |
909 | return mtu; | |
910 | } | |
911 | ||
3b00944c YH |
912 | static struct dst_entry *icmp6_dst_gc_list; |
913 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 914 | |
3b00944c | 915 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 916 | struct neighbour *neigh, |
3b00944c | 917 | struct in6_addr *addr) |
1da177e4 LT |
918 | { |
919 | struct rt6_info *rt; | |
920 | struct inet6_dev *idev = in6_dev_get(dev); | |
5578689a | 921 | struct net *net = dev->nd_net; |
1da177e4 LT |
922 | |
923 | if (unlikely(idev == NULL)) | |
924 | return NULL; | |
925 | ||
f2fc6a54 | 926 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
927 | if (unlikely(rt == NULL)) { |
928 | in6_dev_put(idev); | |
929 | goto out; | |
930 | } | |
931 | ||
932 | dev_hold(dev); | |
933 | if (neigh) | |
934 | neigh_hold(neigh); | |
935 | else | |
936 | neigh = ndisc_get_neigh(dev, addr); | |
937 | ||
938 | rt->rt6i_dev = dev; | |
939 | rt->rt6i_idev = idev; | |
940 | rt->rt6i_nexthop = neigh; | |
941 | atomic_set(&rt->u.dst.__refcnt, 1); | |
942 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
943 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 944 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 945 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
946 | |
947 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
948 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
949 | ? DST_HOST | |
1da177e4 LT |
950 | : 0; |
951 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
952 | rt->rt6i_dst.plen = 128; | |
953 | #endif | |
954 | ||
3b00944c YH |
955 | spin_lock_bh(&icmp6_dst_lock); |
956 | rt->u.dst.next = icmp6_dst_gc_list; | |
957 | icmp6_dst_gc_list = &rt->u.dst; | |
958 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 959 | |
5578689a | 960 | fib6_force_start_gc(net); |
1da177e4 LT |
961 | |
962 | out: | |
40aa7b90 | 963 | return &rt->u.dst; |
1da177e4 LT |
964 | } |
965 | ||
3b00944c | 966 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
967 | { |
968 | struct dst_entry *dst, *next, **pprev; | |
969 | int freed; | |
970 | ||
971 | next = NULL; | |
1ab1457c | 972 | freed = 0; |
5d0bbeeb | 973 | |
3b00944c YH |
974 | spin_lock_bh(&icmp6_dst_lock); |
975 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 976 | |
1da177e4 LT |
977 | while ((dst = *pprev) != NULL) { |
978 | if (!atomic_read(&dst->__refcnt)) { | |
979 | *pprev = dst->next; | |
980 | dst_free(dst); | |
981 | freed++; | |
982 | } else { | |
983 | pprev = &dst->next; | |
984 | (*more)++; | |
985 | } | |
986 | } | |
987 | ||
3b00944c | 988 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 989 | |
1da177e4 LT |
990 | return freed; |
991 | } | |
992 | ||
569d3645 | 993 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 LT |
994 | { |
995 | static unsigned expire = 30*HZ; | |
996 | static unsigned long last_gc; | |
997 | unsigned long now = jiffies; | |
998 | ||
4990509f | 999 | if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && |
f2fc6a54 | 1000 | atomic_read(&init_net.ipv6.ip6_dst_ops->entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) |
1da177e4 LT |
1001 | goto out; |
1002 | ||
1003 | expire++; | |
5b7c931d | 1004 | fib6_run_gc(expire, &init_net); |
1da177e4 | 1005 | last_gc = now; |
f2fc6a54 | 1006 | if (atomic_read(&init_net.ipv6.ip6_dst_ops->entries) < init_net.ipv6.ip6_dst_ops->gc_thresh) |
4990509f | 1007 | expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; |
1da177e4 LT |
1008 | |
1009 | out: | |
4990509f | 1010 | expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; |
f2fc6a54 | 1011 | return (atomic_read(&init_net.ipv6.ip6_dst_ops->entries) > init_net.ipv6.sysctl.ip6_rt_max_size); |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1015 | but results in cleaner routing tables. | |
1016 | ||
1017 | Remove it only when all the things will work! | |
1018 | */ | |
1019 | ||
1020 | static int ipv6_get_mtu(struct net_device *dev) | |
1021 | { | |
1022 | int mtu = IPV6_MIN_MTU; | |
1023 | struct inet6_dev *idev; | |
1024 | ||
1025 | idev = in6_dev_get(dev); | |
1026 | if (idev) { | |
1027 | mtu = idev->cnf.mtu6; | |
1028 | in6_dev_put(idev); | |
1029 | } | |
1030 | return mtu; | |
1031 | } | |
1032 | ||
1033 | int ipv6_get_hoplimit(struct net_device *dev) | |
1034 | { | |
1035 | int hoplimit = ipv6_devconf.hop_limit; | |
1036 | struct inet6_dev *idev; | |
1037 | ||
1038 | idev = in6_dev_get(dev); | |
1039 | if (idev) { | |
1040 | hoplimit = idev->cnf.hop_limit; | |
1041 | in6_dev_put(idev); | |
1042 | } | |
1043 | return hoplimit; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * | |
1048 | */ | |
1049 | ||
86872cb5 | 1050 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1051 | { |
1052 | int err; | |
5578689a | 1053 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1054 | struct rt6_info *rt = NULL; |
1055 | struct net_device *dev = NULL; | |
1056 | struct inet6_dev *idev = NULL; | |
c71099ac | 1057 | struct fib6_table *table; |
1da177e4 LT |
1058 | int addr_type; |
1059 | ||
86872cb5 | 1060 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1061 | return -EINVAL; |
1062 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1063 | if (cfg->fc_src_len) |
1da177e4 LT |
1064 | return -EINVAL; |
1065 | #endif | |
86872cb5 | 1066 | if (cfg->fc_ifindex) { |
1da177e4 | 1067 | err = -ENODEV; |
5578689a | 1068 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1069 | if (!dev) |
1070 | goto out; | |
1071 | idev = in6_dev_get(dev); | |
1072 | if (!idev) | |
1073 | goto out; | |
1074 | } | |
1075 | ||
86872cb5 TG |
1076 | if (cfg->fc_metric == 0) |
1077 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1078 | |
5578689a | 1079 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1080 | if (table == NULL) { |
1081 | err = -ENOBUFS; | |
1082 | goto out; | |
1083 | } | |
1084 | ||
f2fc6a54 | 1085 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1086 | |
1087 | if (rt == NULL) { | |
1088 | err = -ENOMEM; | |
1089 | goto out; | |
1090 | } | |
1091 | ||
1092 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1093 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1094 | |
86872cb5 TG |
1095 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1096 | cfg->fc_protocol = RTPROT_BOOT; | |
1097 | rt->rt6i_protocol = cfg->fc_protocol; | |
1098 | ||
1099 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1100 | |
1101 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1102 | rt->u.dst.input = ip6_mc_input; | |
1103 | else | |
1104 | rt->u.dst.input = ip6_forward; | |
1105 | ||
1106 | rt->u.dst.output = ip6_output; | |
1107 | ||
86872cb5 TG |
1108 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1109 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1110 | if (rt->rt6i_dst.plen == 128) |
1111 | rt->u.dst.flags = DST_HOST; | |
1112 | ||
1113 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1114 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1115 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1116 | #endif |
1117 | ||
86872cb5 | 1118 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1119 | |
1120 | /* We cannot add true routes via loopback here, | |
1121 | they would result in kernel looping; promote them to reject routes | |
1122 | */ | |
86872cb5 | 1123 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1124 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1125 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1126 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1127 | if (dev) { |
1128 | dev_put(dev); | |
1129 | in6_dev_put(idev); | |
1130 | } | |
5578689a | 1131 | dev = net->loopback_dev; |
1da177e4 LT |
1132 | dev_hold(dev); |
1133 | idev = in6_dev_get(dev); | |
1134 | if (!idev) { | |
1135 | err = -ENODEV; | |
1136 | goto out; | |
1137 | } | |
1138 | } | |
1139 | rt->u.dst.output = ip6_pkt_discard_out; | |
1140 | rt->u.dst.input = ip6_pkt_discard; | |
1141 | rt->u.dst.error = -ENETUNREACH; | |
1142 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1143 | goto install_route; | |
1144 | } | |
1145 | ||
86872cb5 | 1146 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1147 | struct in6_addr *gw_addr; |
1148 | int gwa_type; | |
1149 | ||
86872cb5 TG |
1150 | gw_addr = &cfg->fc_gateway; |
1151 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1152 | gwa_type = ipv6_addr_type(gw_addr); |
1153 | ||
1154 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1155 | struct rt6_info *grt; | |
1156 | ||
1157 | /* IPv6 strictly inhibits using not link-local | |
1158 | addresses as nexthop address. | |
1159 | Otherwise, router will not able to send redirects. | |
1160 | It is very good, but in some (rare!) circumstances | |
1161 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1162 | some exceptions. --ANK | |
1163 | */ | |
1164 | err = -EINVAL; | |
1165 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1166 | goto out; | |
1167 | ||
5578689a | 1168 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1169 | |
1170 | err = -EHOSTUNREACH; | |
1171 | if (grt == NULL) | |
1172 | goto out; | |
1173 | if (dev) { | |
1174 | if (dev != grt->rt6i_dev) { | |
1175 | dst_release(&grt->u.dst); | |
1176 | goto out; | |
1177 | } | |
1178 | } else { | |
1179 | dev = grt->rt6i_dev; | |
1180 | idev = grt->rt6i_idev; | |
1181 | dev_hold(dev); | |
1182 | in6_dev_hold(grt->rt6i_idev); | |
1183 | } | |
1184 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1185 | err = 0; | |
1186 | dst_release(&grt->u.dst); | |
1187 | ||
1188 | if (err) | |
1189 | goto out; | |
1190 | } | |
1191 | err = -EINVAL; | |
1192 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1193 | goto out; | |
1194 | } | |
1195 | ||
1196 | err = -ENODEV; | |
1197 | if (dev == NULL) | |
1198 | goto out; | |
1199 | ||
86872cb5 | 1200 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1201 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1202 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1203 | err = PTR_ERR(rt->rt6i_nexthop); | |
1204 | rt->rt6i_nexthop = NULL; | |
1205 | goto out; | |
1206 | } | |
1207 | } | |
1208 | ||
86872cb5 | 1209 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1210 | |
1211 | install_route: | |
86872cb5 TG |
1212 | if (cfg->fc_mx) { |
1213 | struct nlattr *nla; | |
1214 | int remaining; | |
1215 | ||
1216 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1217 | int type = nla_type(nla); |
86872cb5 TG |
1218 | |
1219 | if (type) { | |
1220 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1221 | err = -EINVAL; |
1222 | goto out; | |
1223 | } | |
86872cb5 TG |
1224 | |
1225 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1226 | } |
1da177e4 LT |
1227 | } |
1228 | } | |
1229 | ||
1230 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1231 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1232 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1233 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1234 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
5578689a | 1235 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1236 | rt->u.dst.dev = dev; |
1237 | rt->rt6i_idev = idev; | |
c71099ac | 1238 | rt->rt6i_table = table; |
63152fc0 DL |
1239 | |
1240 | cfg->fc_nlinfo.nl_net = dev->nd_net; | |
1241 | ||
86872cb5 | 1242 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1243 | |
1244 | out: | |
1245 | if (dev) | |
1246 | dev_put(dev); | |
1247 | if (idev) | |
1248 | in6_dev_put(idev); | |
1249 | if (rt) | |
40aa7b90 | 1250 | dst_free(&rt->u.dst); |
1da177e4 LT |
1251 | return err; |
1252 | } | |
1253 | ||
86872cb5 | 1254 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1255 | { |
1256 | int err; | |
c71099ac | 1257 | struct fib6_table *table; |
8ed67789 | 1258 | struct net *net = rt->rt6i_dev->nd_net; |
1da177e4 | 1259 | |
8ed67789 | 1260 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1261 | return -ENOENT; |
1262 | ||
c71099ac TG |
1263 | table = rt->rt6i_table; |
1264 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1265 | |
86872cb5 | 1266 | err = fib6_del(rt, info); |
1da177e4 LT |
1267 | dst_release(&rt->u.dst); |
1268 | ||
c71099ac | 1269 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1270 | |
1271 | return err; | |
1272 | } | |
1273 | ||
e0a1ad73 TG |
1274 | int ip6_del_rt(struct rt6_info *rt) |
1275 | { | |
4d1169c1 | 1276 | struct nl_info info = { |
5578689a | 1277 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 1278 | }; |
528c4ceb | 1279 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1280 | } |
1281 | ||
86872cb5 | 1282 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1283 | { |
c71099ac | 1284 | struct fib6_table *table; |
1da177e4 LT |
1285 | struct fib6_node *fn; |
1286 | struct rt6_info *rt; | |
1287 | int err = -ESRCH; | |
1288 | ||
5578689a | 1289 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1290 | if (table == NULL) |
1291 | return err; | |
1292 | ||
1293 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1294 | |
c71099ac | 1295 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1296 | &cfg->fc_dst, cfg->fc_dst_len, |
1297 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1298 | |
1da177e4 | 1299 | if (fn) { |
7cc48263 | 1300 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1301 | if (cfg->fc_ifindex && |
1da177e4 | 1302 | (rt->rt6i_dev == NULL || |
86872cb5 | 1303 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1304 | continue; |
86872cb5 TG |
1305 | if (cfg->fc_flags & RTF_GATEWAY && |
1306 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1307 | continue; |
86872cb5 | 1308 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1309 | continue; |
1310 | dst_hold(&rt->u.dst); | |
c71099ac | 1311 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1312 | |
86872cb5 | 1313 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1314 | } |
1315 | } | |
c71099ac | 1316 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1317 | |
1318 | return err; | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * Handle redirects | |
1323 | */ | |
a6279458 YH |
1324 | struct ip6rd_flowi { |
1325 | struct flowi fl; | |
1326 | struct in6_addr gateway; | |
1327 | }; | |
1328 | ||
8ed67789 DL |
1329 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1330 | struct fib6_table *table, | |
a6279458 YH |
1331 | struct flowi *fl, |
1332 | int flags) | |
1da177e4 | 1333 | { |
a6279458 YH |
1334 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1335 | struct rt6_info *rt; | |
e843b9e1 | 1336 | struct fib6_node *fn; |
c71099ac | 1337 | |
1da177e4 | 1338 | /* |
e843b9e1 YH |
1339 | * Get the "current" route for this destination and |
1340 | * check if the redirect has come from approriate router. | |
1341 | * | |
1342 | * RFC 2461 specifies that redirects should only be | |
1343 | * accepted if they come from the nexthop to the target. | |
1344 | * Due to the way the routes are chosen, this notion | |
1345 | * is a bit fuzzy and one might need to check all possible | |
1346 | * routes. | |
1da177e4 | 1347 | */ |
1da177e4 | 1348 | |
c71099ac | 1349 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1350 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1351 | restart: |
7cc48263 | 1352 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1353 | /* |
1354 | * Current route is on-link; redirect is always invalid. | |
1355 | * | |
1356 | * Seems, previous statement is not true. It could | |
1357 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1358 | * But then router serving it might decide, that we should | |
1359 | * know truth 8)8) --ANK (980726). | |
1360 | */ | |
1361 | if (rt6_check_expired(rt)) | |
1362 | continue; | |
1363 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1364 | continue; | |
a6279458 | 1365 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1366 | continue; |
a6279458 | 1367 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1368 | continue; |
1369 | break; | |
1370 | } | |
a6279458 | 1371 | |
cb15d9c2 | 1372 | if (!rt) |
8ed67789 DL |
1373 | rt = net->ipv6.ip6_null_entry; |
1374 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1375 | out: |
a6279458 YH |
1376 | dst_hold(&rt->u.dst); |
1377 | ||
c71099ac | 1378 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1379 | |
a6279458 YH |
1380 | return rt; |
1381 | }; | |
1382 | ||
1383 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1384 | struct in6_addr *src, | |
1385 | struct in6_addr *gateway, | |
1386 | struct net_device *dev) | |
1387 | { | |
adaa70bb | 1388 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
5578689a | 1389 | struct net *net = dev->nd_net; |
a6279458 YH |
1390 | struct ip6rd_flowi rdfl = { |
1391 | .fl = { | |
1392 | .oif = dev->ifindex, | |
1393 | .nl_u = { | |
1394 | .ip6_u = { | |
1395 | .daddr = *dest, | |
1396 | .saddr = *src, | |
1397 | }, | |
1398 | }, | |
1399 | }, | |
1400 | .gateway = *gateway, | |
1401 | }; | |
adaa70bb TG |
1402 | |
1403 | if (rt6_need_strict(dest)) | |
1404 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1405 | |
5578689a | 1406 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1407 | flags, __ip6_route_redirect); |
a6279458 YH |
1408 | } |
1409 | ||
1410 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1411 | struct in6_addr *saddr, | |
1412 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1413 | { | |
1414 | struct rt6_info *rt, *nrt = NULL; | |
1415 | struct netevent_redirect netevent; | |
8ed67789 | 1416 | struct net *net = neigh->dev->nd_net; |
a6279458 YH |
1417 | |
1418 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1419 | ||
8ed67789 | 1420 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1421 | if (net_ratelimit()) |
1422 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1423 | "for redirect target\n"); | |
a6279458 | 1424 | goto out; |
1da177e4 LT |
1425 | } |
1426 | ||
1da177e4 LT |
1427 | /* |
1428 | * We have finally decided to accept it. | |
1429 | */ | |
1430 | ||
1ab1457c | 1431 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1432 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1433 | NEIGH_UPDATE_F_OVERRIDE| | |
1434 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1435 | NEIGH_UPDATE_F_ISROUTER)) | |
1436 | ); | |
1437 | ||
1438 | /* | |
1439 | * Redirect received -> path was valid. | |
1440 | * Look, redirects are sent only in response to data packets, | |
1441 | * so that this nexthop apparently is reachable. --ANK | |
1442 | */ | |
1443 | dst_confirm(&rt->u.dst); | |
1444 | ||
1445 | /* Duplicate redirect: silently ignore. */ | |
1446 | if (neigh == rt->u.dst.neighbour) | |
1447 | goto out; | |
1448 | ||
1449 | nrt = ip6_rt_copy(rt); | |
1450 | if (nrt == NULL) | |
1451 | goto out; | |
1452 | ||
1453 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1454 | if (on_link) | |
1455 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1456 | ||
1457 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1458 | nrt->rt6i_dst.plen = 128; | |
1459 | nrt->u.dst.flags |= DST_HOST; | |
1460 | ||
1461 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1462 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1463 | /* Reset pmtu, it may be better */ | |
1464 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
5578689a DL |
1465 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(neigh->dev->nd_net, |
1466 | dst_mtu(&nrt->u.dst)); | |
1da177e4 | 1467 | |
40e22e8f | 1468 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1469 | goto out; |
1470 | ||
8d71740c TT |
1471 | netevent.old = &rt->u.dst; |
1472 | netevent.new = &nrt->u.dst; | |
1473 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1474 | ||
1da177e4 | 1475 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1476 | ip6_del_rt(rt); |
1da177e4 LT |
1477 | return; |
1478 | } | |
1479 | ||
1480 | out: | |
1ab1457c | 1481 | dst_release(&rt->u.dst); |
1da177e4 LT |
1482 | return; |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * Handle ICMP "packet too big" messages | |
1487 | * i.e. Path MTU discovery | |
1488 | */ | |
1489 | ||
1490 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1491 | struct net_device *dev, u32 pmtu) | |
1492 | { | |
1493 | struct rt6_info *rt, *nrt; | |
5578689a | 1494 | struct net *net = dev->nd_net; |
1da177e4 LT |
1495 | int allfrag = 0; |
1496 | ||
5578689a | 1497 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1498 | if (rt == NULL) |
1499 | return; | |
1500 | ||
1501 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1502 | goto out; | |
1503 | ||
1504 | if (pmtu < IPV6_MIN_MTU) { | |
1505 | /* | |
1ab1457c | 1506 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1507 | * MTU (1280) and a fragment header should always be included |
1508 | * after a node receiving Too Big message reporting PMTU is | |
1509 | * less than the IPv6 Minimum Link MTU. | |
1510 | */ | |
1511 | pmtu = IPV6_MIN_MTU; | |
1512 | allfrag = 1; | |
1513 | } | |
1514 | ||
1515 | /* New mtu received -> path was valid. | |
1516 | They are sent only in response to data packets, | |
1517 | so that this nexthop apparently is reachable. --ANK | |
1518 | */ | |
1519 | dst_confirm(&rt->u.dst); | |
1520 | ||
1521 | /* Host route. If it is static, it would be better | |
1522 | not to override it, but add new one, so that | |
1523 | when cache entry will expire old pmtu | |
1524 | would return automatically. | |
1525 | */ | |
1526 | if (rt->rt6i_flags & RTF_CACHE) { | |
1527 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1528 | if (allfrag) | |
1529 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1530 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1531 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1532 | goto out; | |
1533 | } | |
1534 | ||
1535 | /* Network route. | |
1536 | Two cases are possible: | |
1537 | 1. It is connected route. Action: COW | |
1538 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1539 | */ | |
d5315b50 | 1540 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1541 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1542 | else |
1543 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1544 | |
d5315b50 | 1545 | if (nrt) { |
a1e78363 YH |
1546 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1547 | if (allfrag) | |
1548 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1549 | ||
1550 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1551 | * happened within 5 mins, the recommended timer is 10 mins. | |
1552 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1553 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1554 | * and detecting PMTU increase will be automatically happened. | |
1555 | */ | |
5578689a | 1556 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1557 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1558 | ||
40e22e8f | 1559 | ip6_ins_rt(nrt); |
1da177e4 | 1560 | } |
1da177e4 LT |
1561 | out: |
1562 | dst_release(&rt->u.dst); | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | * Misc support functions | |
1567 | */ | |
1568 | ||
1569 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1570 | { | |
f2fc6a54 BT |
1571 | struct net *net = ort->rt6i_dev->nd_net; |
1572 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); | |
1da177e4 LT |
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; |
f2fc6a54 | 1851 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
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 | ||
8ed67789 DL |
1889 | struct arg_dev_net { |
1890 | struct net_device *dev; | |
1891 | struct net *net; | |
1892 | }; | |
1893 | ||
1da177e4 LT |
1894 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1895 | { | |
8ed67789 DL |
1896 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1897 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1898 | ||
1899 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1900 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1901 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1902 | return -1; | |
1903 | } | |
1904 | return 0; | |
1905 | } | |
1906 | ||
f3db4851 | 1907 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1908 | { |
8ed67789 DL |
1909 | struct arg_dev_net adn = { |
1910 | .dev = dev, | |
1911 | .net = net, | |
1912 | }; | |
1913 | ||
1914 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1da177e4 LT |
1915 | } |
1916 | ||
1917 | struct rt6_mtu_change_arg | |
1918 | { | |
1919 | struct net_device *dev; | |
1920 | unsigned mtu; | |
1921 | }; | |
1922 | ||
1923 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1924 | { | |
1925 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1926 | struct inet6_dev *idev; | |
5578689a | 1927 | struct net *net = arg->dev->nd_net; |
1da177e4 LT |
1928 | |
1929 | /* In IPv6 pmtu discovery is not optional, | |
1930 | so that RTAX_MTU lock cannot disable it. | |
1931 | We still use this lock to block changes | |
1932 | caused by addrconf/ndisc. | |
1933 | */ | |
1934 | ||
1935 | idev = __in6_dev_get(arg->dev); | |
1936 | if (idev == NULL) | |
1937 | return 0; | |
1938 | ||
1939 | /* For administrative MTU increase, there is no way to discover | |
1940 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1941 | Since RFC 1981 doesn't include administrative MTU increase | |
1942 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1943 | */ | |
1944 | /* | |
1945 | If new MTU is less than route PMTU, this new MTU will be the | |
1946 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1947 | decreases; if new MTU is greater than route PMTU, and the | |
1948 | old MTU is the lowest MTU in the path, update the route PMTU | |
1949 | to reflect the increase. In this case if the other nodes' MTU | |
1950 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1951 | PMTU discouvery. | |
1952 | */ | |
1953 | if (rt->rt6i_dev == arg->dev && | |
1954 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1955 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1956 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1957 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1958 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 1959 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 1960 | } |
1da177e4 LT |
1961 | return 0; |
1962 | } | |
1963 | ||
1964 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1965 | { | |
c71099ac TG |
1966 | struct rt6_mtu_change_arg arg = { |
1967 | .dev = dev, | |
1968 | .mtu = mtu, | |
1969 | }; | |
1da177e4 | 1970 | |
f3db4851 | 1971 | fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1972 | } |
1973 | ||
ef7c79ed | 1974 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1975 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1976 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1977 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1978 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1979 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1980 | }; | |
1981 | ||
1982 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1983 | struct fib6_config *cfg) | |
1da177e4 | 1984 | { |
86872cb5 TG |
1985 | struct rtmsg *rtm; |
1986 | struct nlattr *tb[RTA_MAX+1]; | |
1987 | int err; | |
1da177e4 | 1988 | |
86872cb5 TG |
1989 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1990 | if (err < 0) | |
1991 | goto errout; | |
1da177e4 | 1992 | |
86872cb5 TG |
1993 | err = -EINVAL; |
1994 | rtm = nlmsg_data(nlh); | |
1995 | memset(cfg, 0, sizeof(*cfg)); | |
1996 | ||
1997 | cfg->fc_table = rtm->rtm_table; | |
1998 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1999 | cfg->fc_src_len = rtm->rtm_src_len; | |
2000 | cfg->fc_flags = RTF_UP; | |
2001 | cfg->fc_protocol = rtm->rtm_protocol; | |
2002 | ||
2003 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2004 | cfg->fc_flags |= RTF_REJECT; | |
2005 | ||
2006 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2007 | cfg->fc_nlinfo.nlh = nlh; | |
2216b483 | 2008 | cfg->fc_nlinfo.nl_net = skb->sk->sk_net; |
86872cb5 TG |
2009 | |
2010 | if (tb[RTA_GATEWAY]) { | |
2011 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2012 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2013 | } |
86872cb5 TG |
2014 | |
2015 | if (tb[RTA_DST]) { | |
2016 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2017 | ||
2018 | if (nla_len(tb[RTA_DST]) < plen) | |
2019 | goto errout; | |
2020 | ||
2021 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2022 | } |
86872cb5 TG |
2023 | |
2024 | if (tb[RTA_SRC]) { | |
2025 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2026 | ||
2027 | if (nla_len(tb[RTA_SRC]) < plen) | |
2028 | goto errout; | |
2029 | ||
2030 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2031 | } |
86872cb5 TG |
2032 | |
2033 | if (tb[RTA_OIF]) | |
2034 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2035 | ||
2036 | if (tb[RTA_PRIORITY]) | |
2037 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2038 | ||
2039 | if (tb[RTA_METRICS]) { | |
2040 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2041 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2042 | } |
86872cb5 TG |
2043 | |
2044 | if (tb[RTA_TABLE]) | |
2045 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2046 | ||
2047 | err = 0; | |
2048 | errout: | |
2049 | return err; | |
1da177e4 LT |
2050 | } |
2051 | ||
c127ea2c | 2052 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2053 | { |
86872cb5 TG |
2054 | struct fib6_config cfg; |
2055 | int err; | |
1da177e4 | 2056 | |
86872cb5 TG |
2057 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2058 | if (err < 0) | |
2059 | return err; | |
2060 | ||
2061 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2062 | } |
2063 | ||
c127ea2c | 2064 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2065 | { |
86872cb5 TG |
2066 | struct fib6_config cfg; |
2067 | int err; | |
1da177e4 | 2068 | |
86872cb5 TG |
2069 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2070 | if (err < 0) | |
2071 | return err; | |
2072 | ||
2073 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2074 | } |
2075 | ||
339bf98f TG |
2076 | static inline size_t rt6_nlmsg_size(void) |
2077 | { | |
2078 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2079 | + nla_total_size(16) /* RTA_SRC */ | |
2080 | + nla_total_size(16) /* RTA_DST */ | |
2081 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2082 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2083 | + nla_total_size(4) /* RTA_TABLE */ | |
2084 | + nla_total_size(4) /* RTA_IIF */ | |
2085 | + nla_total_size(4) /* RTA_OIF */ | |
2086 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2087 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2088 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2089 | } | |
2090 | ||
1da177e4 | 2091 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2092 | struct in6_addr *dst, struct in6_addr *src, |
2093 | int iif, int type, u32 pid, u32 seq, | |
2094 | int prefix, unsigned int flags) | |
1da177e4 LT |
2095 | { |
2096 | struct rtmsg *rtm; | |
2d7202bf | 2097 | struct nlmsghdr *nlh; |
e3703b3d | 2098 | long expires; |
9e762a4a | 2099 | u32 table; |
1da177e4 LT |
2100 | |
2101 | if (prefix) { /* user wants prefix routes only */ | |
2102 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2103 | /* success since this is not a prefix route */ | |
2104 | return 1; | |
2105 | } | |
2106 | } | |
2107 | ||
2d7202bf TG |
2108 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2109 | if (nlh == NULL) | |
26932566 | 2110 | return -EMSGSIZE; |
2d7202bf TG |
2111 | |
2112 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2113 | rtm->rtm_family = AF_INET6; |
2114 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2115 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2116 | rtm->rtm_tos = 0; | |
c71099ac | 2117 | if (rt->rt6i_table) |
9e762a4a | 2118 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2119 | else |
9e762a4a PM |
2120 | table = RT6_TABLE_UNSPEC; |
2121 | rtm->rtm_table = table; | |
2d7202bf | 2122 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2123 | if (rt->rt6i_flags&RTF_REJECT) |
2124 | rtm->rtm_type = RTN_UNREACHABLE; | |
2125 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2126 | rtm->rtm_type = RTN_LOCAL; | |
2127 | else | |
2128 | rtm->rtm_type = RTN_UNICAST; | |
2129 | rtm->rtm_flags = 0; | |
2130 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2131 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2132 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2133 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2134 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2135 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2136 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2137 | rtm->rtm_protocol = RTPROT_RA; | |
2138 | ||
2139 | if (rt->rt6i_flags&RTF_CACHE) | |
2140 | rtm->rtm_flags |= RTM_F_CLONED; | |
2141 | ||
2142 | if (dst) { | |
2d7202bf | 2143 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2144 | rtm->rtm_dst_len = 128; |
1da177e4 | 2145 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2146 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2147 | #ifdef CONFIG_IPV6_SUBTREES |
2148 | if (src) { | |
2d7202bf | 2149 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2150 | rtm->rtm_src_len = 128; |
1da177e4 | 2151 | } else if (rtm->rtm_src_len) |
2d7202bf | 2152 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2153 | #endif |
2154 | if (iif) | |
2d7202bf | 2155 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2156 | else if (dst) { |
2157 | struct in6_addr saddr_buf; | |
5e5f3f0f YH |
2158 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
2159 | dst, &saddr_buf) == 0) | |
2d7202bf | 2160 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2161 | } |
2d7202bf | 2162 | |
1da177e4 | 2163 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2164 | goto nla_put_failure; |
2165 | ||
1da177e4 | 2166 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2167 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2168 | ||
1da177e4 | 2169 | if (rt->u.dst.dev) |
2d7202bf TG |
2170 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2171 | ||
2172 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2173 | |
2174 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2175 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2176 | expires, rt->u.dst.error) < 0) | |
2177 | goto nla_put_failure; | |
2d7202bf TG |
2178 | |
2179 | return nlmsg_end(skb, nlh); | |
2180 | ||
2181 | nla_put_failure: | |
26932566 PM |
2182 | nlmsg_cancel(skb, nlh); |
2183 | return -EMSGSIZE; | |
1da177e4 LT |
2184 | } |
2185 | ||
1b43af54 | 2186 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2187 | { |
2188 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2189 | int prefix; | |
2190 | ||
2d7202bf TG |
2191 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2192 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2193 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2194 | } else | |
2195 | prefix = 0; | |
2196 | ||
2197 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2198 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2199 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2200 | } |
2201 | ||
c127ea2c | 2202 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2203 | { |
b854272b | 2204 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2205 | struct nlattr *tb[RTA_MAX+1]; |
2206 | struct rt6_info *rt; | |
1da177e4 | 2207 | struct sk_buff *skb; |
ab364a6f | 2208 | struct rtmsg *rtm; |
1da177e4 | 2209 | struct flowi fl; |
ab364a6f | 2210 | int err, iif = 0; |
1da177e4 | 2211 | |
ab364a6f TG |
2212 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2213 | if (err < 0) | |
2214 | goto errout; | |
1da177e4 | 2215 | |
ab364a6f | 2216 | err = -EINVAL; |
1da177e4 | 2217 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2218 | |
ab364a6f TG |
2219 | if (tb[RTA_SRC]) { |
2220 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2221 | goto errout; | |
2222 | ||
2223 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2224 | } | |
2225 | ||
2226 | if (tb[RTA_DST]) { | |
2227 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2228 | goto errout; | |
2229 | ||
2230 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2231 | } | |
2232 | ||
2233 | if (tb[RTA_IIF]) | |
2234 | iif = nla_get_u32(tb[RTA_IIF]); | |
2235 | ||
2236 | if (tb[RTA_OIF]) | |
2237 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2238 | |
2239 | if (iif) { | |
2240 | struct net_device *dev; | |
5578689a | 2241 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2242 | if (!dev) { |
2243 | err = -ENODEV; | |
ab364a6f | 2244 | goto errout; |
1da177e4 LT |
2245 | } |
2246 | } | |
2247 | ||
ab364a6f TG |
2248 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2249 | if (skb == NULL) { | |
2250 | err = -ENOBUFS; | |
2251 | goto errout; | |
2252 | } | |
1da177e4 | 2253 | |
ab364a6f TG |
2254 | /* Reserve room for dummy headers, this skb can pass |
2255 | through good chunk of routing engine. | |
2256 | */ | |
459a98ed | 2257 | skb_reset_mac_header(skb); |
ab364a6f | 2258 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2259 | |
ab364a6f | 2260 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2261 | skb->dst = &rt->u.dst; |
2262 | ||
ab364a6f | 2263 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2264 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2265 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2266 | if (err < 0) { |
ab364a6f TG |
2267 | kfree_skb(skb); |
2268 | goto errout; | |
1da177e4 LT |
2269 | } |
2270 | ||
5578689a | 2271 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2272 | errout: |
1da177e4 | 2273 | return err; |
1da177e4 LT |
2274 | } |
2275 | ||
86872cb5 | 2276 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2277 | { |
2278 | struct sk_buff *skb; | |
5578689a | 2279 | struct net *net = info->nl_net; |
528c4ceb DL |
2280 | u32 seq; |
2281 | int err; | |
2282 | ||
2283 | err = -ENOBUFS; | |
2284 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2285 | |
339bf98f | 2286 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2287 | if (skb == NULL) |
2288 | goto errout; | |
2289 | ||
528c4ceb DL |
2290 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2291 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2292 | if (err < 0) { |
2293 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2294 | WARN_ON(err == -EMSGSIZE); | |
2295 | kfree_skb(skb); | |
2296 | goto errout; | |
2297 | } | |
5578689a DL |
2298 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2299 | info->nlh, gfp_any()); | |
21713ebc TG |
2300 | errout: |
2301 | if (err < 0) | |
5578689a | 2302 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2303 | } |
2304 | ||
8ed67789 DL |
2305 | static int ip6_route_dev_notify(struct notifier_block *this, |
2306 | unsigned long event, void *data) | |
2307 | { | |
2308 | struct net_device *dev = (struct net_device *)data; | |
2309 | struct net *net = dev->nd_net; | |
2310 | ||
2311 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2312 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2313 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2314 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2315 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2316 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2317 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2318 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2319 | #endif | |
2320 | } | |
2321 | ||
2322 | return NOTIFY_OK; | |
2323 | } | |
2324 | ||
1da177e4 LT |
2325 | /* |
2326 | * /proc | |
2327 | */ | |
2328 | ||
2329 | #ifdef CONFIG_PROC_FS | |
2330 | ||
2331 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2332 | ||
2333 | struct rt6_proc_arg | |
2334 | { | |
2335 | char *buffer; | |
2336 | int offset; | |
2337 | int length; | |
2338 | int skip; | |
2339 | int len; | |
2340 | }; | |
2341 | ||
2342 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2343 | { | |
33120b30 | 2344 | struct seq_file *m = p_arg; |
1da177e4 | 2345 | |
33120b30 AD |
2346 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2347 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2348 | |
2349 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2350 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2351 | rt->rt6i_src.plen); | |
1da177e4 | 2352 | #else |
33120b30 | 2353 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2354 | #endif |
2355 | ||
2356 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2357 | seq_printf(m, NIP6_SEQFMT, |
2358 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2359 | } else { |
33120b30 | 2360 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2361 | } |
33120b30 AD |
2362 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2363 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2364 | rt->u.dst.__use, rt->rt6i_flags, | |
2365 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2366 | return 0; |
2367 | } | |
2368 | ||
33120b30 | 2369 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2370 | { |
f3db4851 DL |
2371 | struct net *net = (struct net *)m->private; |
2372 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2373 | return 0; |
2374 | } | |
1da177e4 | 2375 | |
33120b30 AD |
2376 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2377 | { | |
f3db4851 DL |
2378 | struct net *net = get_proc_net(inode); |
2379 | if (!net) | |
2380 | return -ENXIO; | |
2381 | return single_open(file, ipv6_route_show, net); | |
2382 | } | |
2383 | ||
2384 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2385 | { | |
2386 | struct seq_file *seq = file->private_data; | |
2387 | struct net *net = seq->private; | |
2388 | put_net(net); | |
2389 | return single_release(inode, file); | |
1da177e4 LT |
2390 | } |
2391 | ||
33120b30 AD |
2392 | static const struct file_operations ipv6_route_proc_fops = { |
2393 | .owner = THIS_MODULE, | |
2394 | .open = ipv6_route_open, | |
2395 | .read = seq_read, | |
2396 | .llseek = seq_lseek, | |
f3db4851 | 2397 | .release = ipv6_route_release, |
33120b30 AD |
2398 | }; |
2399 | ||
1da177e4 LT |
2400 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2401 | { | |
69ddb805 | 2402 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2403 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2404 | net->ipv6.rt6_stats->fib_nodes, |
2405 | net->ipv6.rt6_stats->fib_route_nodes, | |
2406 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2407 | net->ipv6.rt6_stats->fib_rt_entries, | |
2408 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2409 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2410 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2411 | |
2412 | return 0; | |
2413 | } | |
2414 | ||
2415 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2416 | { | |
69ddb805 DL |
2417 | struct net *net = get_proc_net(inode); |
2418 | return single_open(file, rt6_stats_seq_show, net); | |
2419 | } | |
2420 | ||
2421 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2422 | { | |
2423 | struct seq_file *seq = file->private_data; | |
2424 | struct net *net = (struct net *)seq->private; | |
2425 | put_net(net); | |
2426 | return single_release(inode, file); | |
1da177e4 LT |
2427 | } |
2428 | ||
9a32144e | 2429 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2430 | .owner = THIS_MODULE, |
2431 | .open = rt6_stats_seq_open, | |
2432 | .read = seq_read, | |
2433 | .llseek = seq_lseek, | |
69ddb805 | 2434 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2435 | }; |
2436 | #endif /* CONFIG_PROC_FS */ | |
2437 | ||
2438 | #ifdef CONFIG_SYSCTL | |
2439 | ||
1da177e4 LT |
2440 | static |
2441 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2442 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2443 | { | |
5b7c931d DL |
2444 | struct net *net = current->nsproxy->net_ns; |
2445 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2446 | if (write) { |
2447 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2448 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2449 | return 0; |
2450 | } else | |
2451 | return -EINVAL; | |
2452 | } | |
2453 | ||
760f2d01 | 2454 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2455 | { |
1da177e4 | 2456 | .procname = "flush", |
4990509f | 2457 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2458 | .maxlen = sizeof(int), |
89c8b3a1 | 2459 | .mode = 0200, |
1ab1457c | 2460 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2461 | }, |
2462 | { | |
2463 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2464 | .procname = "gc_thresh", | |
9a7ec3a9 | 2465 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2466 | .maxlen = sizeof(int), |
2467 | .mode = 0644, | |
1ab1457c | 2468 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2469 | }, |
2470 | { | |
2471 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2472 | .procname = "max_size", | |
4990509f | 2473 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2474 | .maxlen = sizeof(int), |
2475 | .mode = 0644, | |
1ab1457c | 2476 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2477 | }, |
2478 | { | |
2479 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2480 | .procname = "gc_min_interval", | |
4990509f | 2481 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2482 | .maxlen = sizeof(int), |
2483 | .mode = 0644, | |
1ab1457c | 2484 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2485 | .strategy = &sysctl_jiffies, |
2486 | }, | |
2487 | { | |
2488 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2489 | .procname = "gc_timeout", | |
4990509f | 2490 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2491 | .maxlen = sizeof(int), |
2492 | .mode = 0644, | |
1ab1457c | 2493 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2494 | .strategy = &sysctl_jiffies, |
2495 | }, | |
2496 | { | |
2497 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2498 | .procname = "gc_interval", | |
4990509f | 2499 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2500 | .maxlen = sizeof(int), |
2501 | .mode = 0644, | |
1ab1457c | 2502 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2503 | .strategy = &sysctl_jiffies, |
2504 | }, | |
2505 | { | |
2506 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2507 | .procname = "gc_elasticity", | |
4990509f | 2508 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2509 | .maxlen = sizeof(int), |
2510 | .mode = 0644, | |
1ab1457c | 2511 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2512 | .strategy = &sysctl_jiffies, |
2513 | }, | |
2514 | { | |
2515 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2516 | .procname = "mtu_expires", | |
4990509f | 2517 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2518 | .maxlen = sizeof(int), |
2519 | .mode = 0644, | |
1ab1457c | 2520 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2521 | .strategy = &sysctl_jiffies, |
2522 | }, | |
2523 | { | |
2524 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2525 | .procname = "min_adv_mss", | |
4990509f | 2526 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2527 | .maxlen = sizeof(int), |
2528 | .mode = 0644, | |
1ab1457c | 2529 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2530 | .strategy = &sysctl_jiffies, |
2531 | }, | |
2532 | { | |
2533 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2534 | .procname = "gc_min_interval_ms", | |
4990509f | 2535 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2536 | .maxlen = sizeof(int), |
2537 | .mode = 0644, | |
1ab1457c | 2538 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2539 | .strategy = &sysctl_ms_jiffies, |
2540 | }, | |
2541 | { .ctl_name = 0 } | |
2542 | }; | |
2543 | ||
760f2d01 DL |
2544 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2545 | { | |
2546 | struct ctl_table *table; | |
2547 | ||
2548 | table = kmemdup(ipv6_route_table_template, | |
2549 | sizeof(ipv6_route_table_template), | |
2550 | GFP_KERNEL); | |
5ee09105 YH |
2551 | |
2552 | if (table) { | |
2553 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2554 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2555 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2556 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2557 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2558 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2559 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2560 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2561 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2562 | } | |
2563 | ||
760f2d01 DL |
2564 | return table; |
2565 | } | |
1da177e4 LT |
2566 | #endif |
2567 | ||
cdb18761 DL |
2568 | static int ip6_route_net_init(struct net *net) |
2569 | { | |
8ed67789 DL |
2570 | int ret = 0; |
2571 | ||
2572 | ret = -ENOMEM; | |
f2fc6a54 BT |
2573 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2574 | sizeof(*net->ipv6.ip6_dst_ops), | |
2575 | GFP_KERNEL); | |
2576 | if (!net->ipv6.ip6_dst_ops) | |
2577 | goto out; | |
2578 | net->ipv6.ip6_dst_ops->dst_net = net; | |
2579 | ||
8ed67789 DL |
2580 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2581 | sizeof(*net->ipv6.ip6_null_entry), | |
2582 | GFP_KERNEL); | |
2583 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2584 | goto out_ip6_dst_ops; |
8ed67789 DL |
2585 | net->ipv6.ip6_null_entry->u.dst.path = |
2586 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2587 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2588 | |
2589 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2590 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2591 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2592 | GFP_KERNEL); | |
2593 | if (!net->ipv6.ip6_prohibit_entry) { | |
2594 | kfree(net->ipv6.ip6_null_entry); | |
2595 | goto out; | |
2596 | } | |
2597 | net->ipv6.ip6_prohibit_entry->u.dst.path = | |
2598 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2599 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2600 | |
2601 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2602 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2603 | GFP_KERNEL); | |
2604 | if (!net->ipv6.ip6_blk_hole_entry) { | |
2605 | kfree(net->ipv6.ip6_null_entry); | |
2606 | kfree(net->ipv6.ip6_prohibit_entry); | |
2607 | goto out; | |
2608 | } | |
2609 | net->ipv6.ip6_blk_hole_entry->u.dst.path = | |
2610 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2611 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2612 | #endif |
2613 | ||
cdb18761 DL |
2614 | #ifdef CONFIG_PROC_FS |
2615 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2616 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2617 | #endif | |
8ed67789 DL |
2618 | ret = 0; |
2619 | out: | |
2620 | return ret; | |
f2fc6a54 BT |
2621 | |
2622 | out_ip6_dst_ops: | |
2623 | kfree(net->ipv6.ip6_dst_ops); | |
2624 | goto out; | |
cdb18761 DL |
2625 | } |
2626 | ||
2627 | static void ip6_route_net_exit(struct net *net) | |
2628 | { | |
2629 | #ifdef CONFIG_PROC_FS | |
2630 | proc_net_remove(net, "ipv6_route"); | |
2631 | proc_net_remove(net, "rt6_stats"); | |
2632 | #endif | |
8ed67789 DL |
2633 | kfree(net->ipv6.ip6_null_entry); |
2634 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2635 | kfree(net->ipv6.ip6_prohibit_entry); | |
2636 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2637 | #endif | |
f2fc6a54 | 2638 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2639 | } |
2640 | ||
2641 | static struct pernet_operations ip6_route_net_ops = { | |
2642 | .init = ip6_route_net_init, | |
2643 | .exit = ip6_route_net_exit, | |
2644 | }; | |
2645 | ||
8ed67789 DL |
2646 | static struct notifier_block ip6_route_dev_notifier = { |
2647 | .notifier_call = ip6_route_dev_notify, | |
2648 | .priority = 0, | |
2649 | }; | |
2650 | ||
433d49c3 | 2651 | int __init ip6_route_init(void) |
1da177e4 | 2652 | { |
433d49c3 DL |
2653 | int ret; |
2654 | ||
9a7ec3a9 DL |
2655 | ret = -ENOMEM; |
2656 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2657 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2658 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2659 | if (!ip6_dst_ops_template.kmem_cachep) |
f2fc6a54 | 2660 | goto out;; |
14e50e57 | 2661 | |
8ed67789 DL |
2662 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2663 | if (ret) | |
bdb3289f | 2664 | goto out_kmem_cache; |
bdb3289f | 2665 | |
8ed67789 DL |
2666 | /* Registering of the loopback is done before this portion of code, |
2667 | * the loopback reference in rt6_info will not be taken, do it | |
2668 | * manually for init_net */ | |
2669 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2670 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2671 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2672 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2673 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2674 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2675 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2676 | #endif | |
433d49c3 DL |
2677 | ret = fib6_init(); |
2678 | if (ret) | |
8ed67789 | 2679 | goto out_register_subsys; |
433d49c3 | 2680 | |
433d49c3 DL |
2681 | ret = xfrm6_init(); |
2682 | if (ret) | |
cdb18761 | 2683 | goto out_fib6_init; |
c35b7e72 | 2684 | |
433d49c3 DL |
2685 | ret = fib6_rules_init(); |
2686 | if (ret) | |
2687 | goto xfrm6_init; | |
7e5449c2 | 2688 | |
433d49c3 DL |
2689 | ret = -ENOBUFS; |
2690 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2691 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2692 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2693 | goto fib6_rules_init; | |
c127ea2c | 2694 | |
8ed67789 | 2695 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2696 | if (ret) |
2697 | goto fib6_rules_init; | |
8ed67789 | 2698 | |
433d49c3 DL |
2699 | out: |
2700 | return ret; | |
2701 | ||
2702 | fib6_rules_init: | |
433d49c3 DL |
2703 | fib6_rules_cleanup(); |
2704 | xfrm6_init: | |
433d49c3 | 2705 | xfrm6_fini(); |
433d49c3 | 2706 | out_fib6_init: |
433d49c3 | 2707 | fib6_gc_cleanup(); |
8ed67789 DL |
2708 | out_register_subsys: |
2709 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2710 | out_kmem_cache: |
f2fc6a54 | 2711 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2712 | goto out; |
1da177e4 LT |
2713 | } |
2714 | ||
2715 | void ip6_route_cleanup(void) | |
2716 | { | |
8ed67789 | 2717 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2718 | fib6_rules_cleanup(); |
1da177e4 | 2719 | xfrm6_fini(); |
1da177e4 | 2720 | fib6_gc_cleanup(); |
8ed67789 | 2721 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2722 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2723 | } |