]>
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 | ||
1da177e4 LT |
100 | static struct dst_ops ip6_dst_ops = { |
101 | .family = AF_INET6, | |
102 | .protocol = __constant_htons(ETH_P_IPV6), | |
103 | .gc = ip6_dst_gc, | |
104 | .gc_thresh = 1024, | |
105 | .check = ip6_dst_check, | |
106 | .destroy = ip6_dst_destroy, | |
107 | .ifdown = ip6_dst_ifdown, | |
108 | .negative_advice = ip6_negative_advice, | |
109 | .link_failure = ip6_link_failure, | |
110 | .update_pmtu = ip6_rt_update_pmtu, | |
862b82c6 | 111 | .local_out = ip6_local_out, |
1da177e4 | 112 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 113 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
114 | }; |
115 | ||
14e50e57 DM |
116 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
117 | { | |
118 | } | |
119 | ||
120 | static struct dst_ops ip6_dst_blackhole_ops = { | |
121 | .family = AF_INET6, | |
122 | .protocol = __constant_htons(ETH_P_IPV6), | |
123 | .destroy = ip6_dst_destroy, | |
124 | .check = ip6_dst_check, | |
125 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
126 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 127 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
128 | }; |
129 | ||
1da177e4 LT |
130 | struct rt6_info ip6_null_entry = { |
131 | .u = { | |
132 | .dst = { | |
133 | .__refcnt = ATOMIC_INIT(1), | |
134 | .__use = 1, | |
1da177e4 LT |
135 | .obsolete = -1, |
136 | .error = -ENETUNREACH, | |
137 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
138 | .input = ip6_pkt_discard, | |
139 | .output = ip6_pkt_discard_out, | |
140 | .ops = &ip6_dst_ops, | |
141 | .path = (struct dst_entry*)&ip6_null_entry, | |
142 | } | |
143 | }, | |
144 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
145 | .rt6i_metric = ~(u32) 0, | |
146 | .rt6i_ref = ATOMIC_INIT(1), | |
147 | }; | |
148 | ||
101367c2 TG |
149 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
150 | ||
6723ab54 DM |
151 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
152 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 153 | |
101367c2 TG |
154 | struct rt6_info ip6_prohibit_entry = { |
155 | .u = { | |
156 | .dst = { | |
157 | .__refcnt = ATOMIC_INIT(1), | |
158 | .__use = 1, | |
101367c2 TG |
159 | .obsolete = -1, |
160 | .error = -EACCES, | |
161 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
162 | .input = ip6_pkt_prohibit, |
163 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
164 | .ops = &ip6_dst_ops, |
165 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
166 | } | |
167 | }, | |
168 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
169 | .rt6i_metric = ~(u32) 0, | |
170 | .rt6i_ref = ATOMIC_INIT(1), | |
171 | }; | |
172 | ||
173 | struct rt6_info ip6_blk_hole_entry = { | |
174 | .u = { | |
175 | .dst = { | |
176 | .__refcnt = ATOMIC_INIT(1), | |
177 | .__use = 1, | |
101367c2 TG |
178 | .obsolete = -1, |
179 | .error = -EINVAL, | |
180 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
181 | .input = dst_discard, |
182 | .output = dst_discard, | |
101367c2 TG |
183 | .ops = &ip6_dst_ops, |
184 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
185 | } | |
186 | }, | |
187 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
188 | .rt6i_metric = ~(u32) 0, | |
189 | .rt6i_ref = ATOMIC_INIT(1), | |
190 | }; | |
191 | ||
192 | #endif | |
193 | ||
1da177e4 LT |
194 | /* allocate dst with ip6_dst_ops */ |
195 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
196 | { | |
197 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
198 | } | |
199 | ||
200 | static void ip6_dst_destroy(struct dst_entry *dst) | |
201 | { | |
202 | struct rt6_info *rt = (struct rt6_info *)dst; | |
203 | struct inet6_dev *idev = rt->rt6i_idev; | |
204 | ||
205 | if (idev != NULL) { | |
206 | rt->rt6i_idev = NULL; | |
207 | in6_dev_put(idev); | |
1ab1457c | 208 | } |
1da177e4 LT |
209 | } |
210 | ||
211 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
212 | int how) | |
213 | { | |
214 | struct rt6_info *rt = (struct rt6_info *)dst; | |
215 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
216 | struct net_device *loopback_dev = |
217 | dev->nd_net->loopback_dev; | |
1da177e4 | 218 | |
5a3e55d6 DL |
219 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
220 | struct inet6_dev *loopback_idev = | |
221 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
222 | if (loopback_idev != NULL) { |
223 | rt->rt6i_idev = loopback_idev; | |
224 | in6_dev_put(idev); | |
225 | } | |
226 | } | |
227 | } | |
228 | ||
229 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
230 | { | |
231 | return (rt->rt6i_flags & RTF_EXPIRES && | |
232 | time_after(jiffies, rt->rt6i_expires)); | |
233 | } | |
234 | ||
c71099ac TG |
235 | static inline int rt6_need_strict(struct in6_addr *daddr) |
236 | { | |
237 | return (ipv6_addr_type(daddr) & | |
238 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
239 | } | |
240 | ||
1da177e4 | 241 | /* |
c71099ac | 242 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
243 | */ |
244 | ||
245 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
246 | int oif, | |
247 | int strict) | |
248 | { | |
249 | struct rt6_info *local = NULL; | |
250 | struct rt6_info *sprt; | |
251 | ||
252 | if (oif) { | |
7cc48263 | 253 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
254 | struct net_device *dev = sprt->rt6i_dev; |
255 | if (dev->ifindex == oif) | |
256 | return sprt; | |
257 | if (dev->flags & IFF_LOOPBACK) { | |
258 | if (sprt->rt6i_idev == NULL || | |
259 | sprt->rt6i_idev->dev->ifindex != oif) { | |
260 | if (strict && oif) | |
261 | continue; | |
1ab1457c | 262 | if (local && (!oif || |
1da177e4 LT |
263 | local->rt6i_idev->dev->ifindex == oif)) |
264 | continue; | |
265 | } | |
266 | local = sprt; | |
267 | } | |
268 | } | |
269 | ||
270 | if (local) | |
271 | return local; | |
272 | ||
273 | if (strict) | |
274 | return &ip6_null_entry; | |
275 | } | |
276 | return rt; | |
277 | } | |
278 | ||
27097255 YH |
279 | #ifdef CONFIG_IPV6_ROUTER_PREF |
280 | static void rt6_probe(struct rt6_info *rt) | |
281 | { | |
282 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
283 | /* | |
284 | * Okay, this does not seem to be appropriate | |
285 | * for now, however, we need to check if it | |
286 | * is really so; aka Router Reachability Probing. | |
287 | * | |
288 | * Router Reachability Probe MUST be rate-limited | |
289 | * to no more than one per minute. | |
290 | */ | |
291 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
292 | return; | |
293 | read_lock_bh(&neigh->lock); | |
294 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 295 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
296 | struct in6_addr mcaddr; |
297 | struct in6_addr *target; | |
298 | ||
299 | neigh->updated = jiffies; | |
300 | read_unlock_bh(&neigh->lock); | |
301 | ||
302 | target = (struct in6_addr *)&neigh->primary_key; | |
303 | addrconf_addr_solict_mult(target, &mcaddr); | |
304 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
305 | } else | |
306 | read_unlock_bh(&neigh->lock); | |
307 | } | |
308 | #else | |
309 | static inline void rt6_probe(struct rt6_info *rt) | |
310 | { | |
311 | return; | |
312 | } | |
313 | #endif | |
314 | ||
1da177e4 | 315 | /* |
554cfb7e | 316 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 317 | */ |
b6f99a21 | 318 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
319 | { |
320 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 321 | if (!oif || dev->ifindex == oif) |
554cfb7e | 322 | return 2; |
161980f4 DM |
323 | if ((dev->flags & IFF_LOOPBACK) && |
324 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
325 | return 1; | |
326 | return 0; | |
554cfb7e | 327 | } |
1da177e4 | 328 | |
b6f99a21 | 329 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 330 | { |
554cfb7e | 331 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 332 | int m; |
4d0c5911 YH |
333 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
334 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
335 | m = 1; | |
336 | else if (neigh) { | |
554cfb7e YH |
337 | read_lock_bh(&neigh->lock); |
338 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 339 | m = 2; |
398bcbeb YH |
340 | #ifdef CONFIG_IPV6_ROUTER_PREF |
341 | else if (neigh->nud_state & NUD_FAILED) | |
342 | m = 0; | |
343 | #endif | |
344 | else | |
ea73ee23 | 345 | m = 1; |
554cfb7e | 346 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
347 | } else |
348 | m = 0; | |
554cfb7e | 349 | return m; |
1da177e4 LT |
350 | } |
351 | ||
554cfb7e YH |
352 | static int rt6_score_route(struct rt6_info *rt, int oif, |
353 | int strict) | |
1da177e4 | 354 | { |
4d0c5911 | 355 | int m, n; |
1ab1457c | 356 | |
4d0c5911 | 357 | m = rt6_check_dev(rt, oif); |
77d16f45 | 358 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 359 | return -1; |
ebacaaa0 YH |
360 | #ifdef CONFIG_IPV6_ROUTER_PREF |
361 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
362 | #endif | |
4d0c5911 | 363 | n = rt6_check_neigh(rt); |
557e92ef | 364 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
365 | return -1; |
366 | return m; | |
367 | } | |
368 | ||
f11e6659 DM |
369 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
370 | int *mpri, struct rt6_info *match) | |
554cfb7e | 371 | { |
f11e6659 DM |
372 | int m; |
373 | ||
374 | if (rt6_check_expired(rt)) | |
375 | goto out; | |
376 | ||
377 | m = rt6_score_route(rt, oif, strict); | |
378 | if (m < 0) | |
379 | goto out; | |
380 | ||
381 | if (m > *mpri) { | |
382 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
383 | rt6_probe(match); | |
384 | *mpri = m; | |
385 | match = rt; | |
386 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
387 | rt6_probe(rt); | |
388 | } | |
389 | ||
390 | out: | |
391 | return match; | |
392 | } | |
393 | ||
394 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
395 | struct rt6_info *rr_head, | |
396 | u32 metric, int oif, int strict) | |
397 | { | |
398 | struct rt6_info *rt, *match; | |
554cfb7e | 399 | int mpri = -1; |
1da177e4 | 400 | |
f11e6659 DM |
401 | match = NULL; |
402 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
403 | rt = rt->u.dst.rt6_next) | |
404 | match = find_match(rt, oif, strict, &mpri, match); | |
405 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
406 | rt = rt->u.dst.rt6_next) | |
407 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 408 | |
f11e6659 DM |
409 | return match; |
410 | } | |
1da177e4 | 411 | |
f11e6659 DM |
412 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
413 | { | |
414 | struct rt6_info *match, *rt0; | |
1da177e4 | 415 | |
f11e6659 DM |
416 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
417 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 418 | |
f11e6659 DM |
419 | rt0 = fn->rr_ptr; |
420 | if (!rt0) | |
421 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 422 | |
f11e6659 | 423 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 424 | |
554cfb7e | 425 | if (!match && |
f11e6659 DM |
426 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
427 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
428 | ||
554cfb7e | 429 | /* no entries matched; do round-robin */ |
f11e6659 DM |
430 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
431 | next = fn->leaf; | |
432 | ||
433 | if (next != rt0) | |
434 | fn->rr_ptr = next; | |
1da177e4 | 435 | } |
1da177e4 | 436 | |
f11e6659 DM |
437 | RT6_TRACE("%s() => %p\n", |
438 | __FUNCTION__, match); | |
1da177e4 | 439 | |
554cfb7e | 440 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
441 | } |
442 | ||
70ceb4f5 YH |
443 | #ifdef CONFIG_IPV6_ROUTE_INFO |
444 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
445 | struct in6_addr *gwaddr) | |
446 | { | |
efa2cea0 | 447 | struct net *net = dev->nd_net; |
70ceb4f5 YH |
448 | struct route_info *rinfo = (struct route_info *) opt; |
449 | struct in6_addr prefix_buf, *prefix; | |
450 | unsigned int pref; | |
451 | u32 lifetime; | |
452 | struct rt6_info *rt; | |
453 | ||
454 | if (len < sizeof(struct route_info)) { | |
455 | return -EINVAL; | |
456 | } | |
457 | ||
458 | /* Sanity check for prefix_len and length */ | |
459 | if (rinfo->length > 3) { | |
460 | return -EINVAL; | |
461 | } else if (rinfo->prefix_len > 128) { | |
462 | return -EINVAL; | |
463 | } else if (rinfo->prefix_len > 64) { | |
464 | if (rinfo->length < 2) { | |
465 | return -EINVAL; | |
466 | } | |
467 | } else if (rinfo->prefix_len > 0) { | |
468 | if (rinfo->length < 1) { | |
469 | return -EINVAL; | |
470 | } | |
471 | } | |
472 | ||
473 | pref = rinfo->route_pref; | |
474 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
475 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
476 | ||
e69a4adc | 477 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
478 | if (lifetime == 0xffffffff) { |
479 | /* infinity */ | |
480 | } else if (lifetime > 0x7fffffff/HZ) { | |
481 | /* Avoid arithmetic overflow */ | |
482 | lifetime = 0x7fffffff/HZ - 1; | |
483 | } | |
484 | ||
485 | if (rinfo->length == 3) | |
486 | prefix = (struct in6_addr *)rinfo->prefix; | |
487 | else { | |
488 | /* this function is safe */ | |
489 | ipv6_addr_prefix(&prefix_buf, | |
490 | (struct in6_addr *)rinfo->prefix, | |
491 | rinfo->prefix_len); | |
492 | prefix = &prefix_buf; | |
493 | } | |
494 | ||
efa2cea0 DL |
495 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
496 | dev->ifindex); | |
70ceb4f5 YH |
497 | |
498 | if (rt && !lifetime) { | |
e0a1ad73 | 499 | ip6_del_rt(rt); |
70ceb4f5 YH |
500 | rt = NULL; |
501 | } | |
502 | ||
503 | if (!rt && lifetime) | |
efa2cea0 | 504 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
505 | pref); |
506 | else if (rt) | |
507 | rt->rt6i_flags = RTF_ROUTEINFO | | |
508 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
509 | ||
510 | if (rt) { | |
511 | if (lifetime == 0xffffffff) { | |
512 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
513 | } else { | |
514 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
515 | rt->rt6i_flags |= RTF_EXPIRES; | |
516 | } | |
517 | dst_release(&rt->u.dst); | |
518 | } | |
519 | return 0; | |
520 | } | |
521 | #endif | |
522 | ||
982f56f3 YH |
523 | #define BACKTRACK(saddr) \ |
524 | do { \ | |
525 | if (rt == &ip6_null_entry) { \ | |
526 | struct fib6_node *pn; \ | |
e0eda7bb | 527 | while (1) { \ |
982f56f3 YH |
528 | if (fn->fn_flags & RTN_TL_ROOT) \ |
529 | goto out; \ | |
530 | pn = fn->parent; \ | |
531 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 532 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
533 | else \ |
534 | fn = pn; \ | |
535 | if (fn->fn_flags & RTN_RTINFO) \ | |
536 | goto restart; \ | |
c71099ac | 537 | } \ |
c71099ac | 538 | } \ |
982f56f3 | 539 | } while(0) |
c71099ac TG |
540 | |
541 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
542 | struct flowi *fl, int flags) | |
1da177e4 LT |
543 | { |
544 | struct fib6_node *fn; | |
545 | struct rt6_info *rt; | |
546 | ||
c71099ac TG |
547 | read_lock_bh(&table->tb6_lock); |
548 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
549 | restart: | |
550 | rt = fn->leaf; | |
77d16f45 | 551 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 552 | BACKTRACK(&fl->fl6_src); |
c71099ac | 553 | out: |
03f49f34 | 554 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 555 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
556 | return rt; |
557 | ||
558 | } | |
559 | ||
606a2b48 DL |
560 | struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr, |
561 | struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
562 | { |
563 | struct flowi fl = { | |
564 | .oif = oif, | |
565 | .nl_u = { | |
566 | .ip6_u = { | |
567 | .daddr = *daddr, | |
c71099ac TG |
568 | }, |
569 | }, | |
570 | }; | |
571 | struct dst_entry *dst; | |
77d16f45 | 572 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 573 | |
adaa70bb TG |
574 | if (saddr) { |
575 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
576 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
577 | } | |
578 | ||
606a2b48 | 579 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
580 | if (dst->error == 0) |
581 | return (struct rt6_info *) dst; | |
582 | ||
583 | dst_release(dst); | |
584 | ||
1da177e4 LT |
585 | return NULL; |
586 | } | |
587 | ||
7159039a YH |
588 | EXPORT_SYMBOL(rt6_lookup); |
589 | ||
c71099ac | 590 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
591 | It takes new route entry, the addition fails by any reason the |
592 | route is freed. In any case, if caller does not hold it, it may | |
593 | be destroyed. | |
594 | */ | |
595 | ||
86872cb5 | 596 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
597 | { |
598 | int err; | |
c71099ac | 599 | struct fib6_table *table; |
1da177e4 | 600 | |
c71099ac TG |
601 | table = rt->rt6i_table; |
602 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 603 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 604 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
605 | |
606 | return err; | |
607 | } | |
608 | ||
40e22e8f TG |
609 | int ip6_ins_rt(struct rt6_info *rt) |
610 | { | |
4d1169c1 DL |
611 | struct nl_info info = { |
612 | .nl_net = &init_net, | |
613 | }; | |
528c4ceb | 614 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
615 | } |
616 | ||
95a9a5ba YH |
617 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
618 | struct in6_addr *saddr) | |
1da177e4 | 619 | { |
1da177e4 LT |
620 | struct rt6_info *rt; |
621 | ||
622 | /* | |
623 | * Clone the route. | |
624 | */ | |
625 | ||
626 | rt = ip6_rt_copy(ort); | |
627 | ||
628 | if (rt) { | |
58c4fb86 YH |
629 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
630 | if (rt->rt6i_dst.plen != 128 && | |
631 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
632 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 633 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 634 | } |
1da177e4 | 635 | |
58c4fb86 | 636 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
637 | rt->rt6i_dst.plen = 128; |
638 | rt->rt6i_flags |= RTF_CACHE; | |
639 | rt->u.dst.flags |= DST_HOST; | |
640 | ||
641 | #ifdef CONFIG_IPV6_SUBTREES | |
642 | if (rt->rt6i_src.plen && saddr) { | |
643 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
644 | rt->rt6i_src.plen = 128; | |
645 | } | |
646 | #endif | |
647 | ||
648 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
649 | ||
95a9a5ba | 650 | } |
1da177e4 | 651 | |
95a9a5ba YH |
652 | return rt; |
653 | } | |
1da177e4 | 654 | |
299d9939 YH |
655 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
656 | { | |
657 | struct rt6_info *rt = ip6_rt_copy(ort); | |
658 | if (rt) { | |
659 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
660 | rt->rt6i_dst.plen = 128; | |
661 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
662 | rt->u.dst.flags |= DST_HOST; |
663 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
664 | } | |
665 | return rt; | |
666 | } | |
667 | ||
4acad72d | 668 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, |
8ce11e6a | 669 | struct flowi *fl, int flags) |
1da177e4 LT |
670 | { |
671 | struct fib6_node *fn; | |
519fbd87 | 672 | struct rt6_info *rt, *nrt; |
c71099ac | 673 | int strict = 0; |
1da177e4 | 674 | int attempts = 3; |
519fbd87 | 675 | int err; |
ea659e07 | 676 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 677 | |
77d16f45 | 678 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
679 | |
680 | relookup: | |
c71099ac | 681 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 682 | |
8238dd06 | 683 | restart_2: |
c71099ac | 684 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
685 | |
686 | restart: | |
4acad72d | 687 | rt = rt6_select(fn, oif, strict | reachable); |
982f56f3 | 688 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
689 | if (rt == &ip6_null_entry || |
690 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 691 | goto out; |
1da177e4 | 692 | |
fb9de91e | 693 | dst_hold(&rt->u.dst); |
c71099ac | 694 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 695 | |
519fbd87 | 696 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 697 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
698 | else { |
699 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 700 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
701 | #else |
702 | goto out2; | |
703 | #endif | |
704 | } | |
e40cf353 | 705 | |
519fbd87 YH |
706 | dst_release(&rt->u.dst); |
707 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 708 | |
519fbd87 YH |
709 | dst_hold(&rt->u.dst); |
710 | if (nrt) { | |
40e22e8f | 711 | err = ip6_ins_rt(nrt); |
519fbd87 | 712 | if (!err) |
1da177e4 | 713 | goto out2; |
1da177e4 | 714 | } |
1da177e4 | 715 | |
519fbd87 YH |
716 | if (--attempts <= 0) |
717 | goto out2; | |
718 | ||
719 | /* | |
c71099ac | 720 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
721 | * released someone could insert this route. Relookup. |
722 | */ | |
723 | dst_release(&rt->u.dst); | |
724 | goto relookup; | |
725 | ||
726 | out: | |
8238dd06 YH |
727 | if (reachable) { |
728 | reachable = 0; | |
729 | goto restart_2; | |
730 | } | |
519fbd87 | 731 | dst_hold(&rt->u.dst); |
c71099ac | 732 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
733 | out2: |
734 | rt->u.dst.lastuse = jiffies; | |
735 | rt->u.dst.__use++; | |
c71099ac TG |
736 | |
737 | return rt; | |
1da177e4 LT |
738 | } |
739 | ||
4acad72d PE |
740 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
741 | struct flowi *fl, int flags) | |
742 | { | |
743 | return ip6_pol_route(table, fl->iif, fl, flags); | |
744 | } | |
745 | ||
c71099ac TG |
746 | void ip6_route_input(struct sk_buff *skb) |
747 | { | |
0660e03f | 748 | struct ipv6hdr *iph = ipv6_hdr(skb); |
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 | |
58f09b78 | 766 | skb->dst = fib6_rule_lookup(&init_net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
767 | } |
768 | ||
769 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
770 | struct flowi *fl, int flags) | |
1da177e4 | 771 | { |
4acad72d | 772 | return ip6_pol_route(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 | ||
894 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
895 | { | |
896 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
897 | ||
4990509f DL |
898 | if (mtu < init_net.ipv6.sysctl.ip6_rt_min_advmss) |
899 | mtu = init_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); | |
921 | ||
922 | if (unlikely(idev == NULL)) | |
923 | return NULL; | |
924 | ||
925 | rt = ip6_dst_alloc(); | |
926 | if (unlikely(rt == NULL)) { | |
927 | in6_dev_put(idev); | |
928 | goto out; | |
929 | } | |
930 | ||
931 | dev_hold(dev); | |
932 | if (neigh) | |
933 | neigh_hold(neigh); | |
934 | else | |
935 | neigh = ndisc_get_neigh(dev, addr); | |
936 | ||
937 | rt->rt6i_dev = dev; | |
938 | rt->rt6i_idev = idev; | |
939 | rt->rt6i_nexthop = neigh; | |
940 | atomic_set(&rt->u.dst.__refcnt, 1); | |
941 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
942 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
943 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
3b00944c | 944 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
945 | |
946 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
947 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
948 | ? DST_HOST | |
1da177e4 LT |
949 | : 0; |
950 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
951 | rt->rt6i_dst.plen = 128; | |
952 | #endif | |
953 | ||
3b00944c YH |
954 | spin_lock_bh(&icmp6_dst_lock); |
955 | rt->u.dst.next = icmp6_dst_gc_list; | |
956 | icmp6_dst_gc_list = &rt->u.dst; | |
957 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 958 | |
63152fc0 | 959 | fib6_force_start_gc(dev->nd_net); |
1da177e4 LT |
960 | |
961 | out: | |
40aa7b90 | 962 | return &rt->u.dst; |
1da177e4 LT |
963 | } |
964 | ||
3b00944c | 965 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
966 | { |
967 | struct dst_entry *dst, *next, **pprev; | |
968 | int freed; | |
969 | ||
970 | next = NULL; | |
1ab1457c | 971 | freed = 0; |
5d0bbeeb | 972 | |
3b00944c YH |
973 | spin_lock_bh(&icmp6_dst_lock); |
974 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 975 | |
1da177e4 LT |
976 | while ((dst = *pprev) != NULL) { |
977 | if (!atomic_read(&dst->__refcnt)) { | |
978 | *pprev = dst->next; | |
979 | dst_free(dst); | |
980 | freed++; | |
981 | } else { | |
982 | pprev = &dst->next; | |
983 | (*more)++; | |
984 | } | |
985 | } | |
986 | ||
3b00944c | 987 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 988 | |
1da177e4 LT |
989 | return freed; |
990 | } | |
991 | ||
569d3645 | 992 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 LT |
993 | { |
994 | static unsigned expire = 30*HZ; | |
995 | static unsigned long last_gc; | |
996 | unsigned long now = jiffies; | |
997 | ||
4990509f DL |
998 | if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && |
999 | atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) | |
1da177e4 LT |
1000 | goto out; |
1001 | ||
1002 | expire++; | |
5b7c931d | 1003 | fib6_run_gc(expire, &init_net); |
1da177e4 LT |
1004 | last_gc = now; |
1005 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
4990509f | 1006 | expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; |
1da177e4 LT |
1007 | |
1008 | out: | |
4990509f DL |
1009 | expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; |
1010 | return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size); | |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1014 | but results in cleaner routing tables. | |
1015 | ||
1016 | Remove it only when all the things will work! | |
1017 | */ | |
1018 | ||
1019 | static int ipv6_get_mtu(struct net_device *dev) | |
1020 | { | |
1021 | int mtu = IPV6_MIN_MTU; | |
1022 | struct inet6_dev *idev; | |
1023 | ||
1024 | idev = in6_dev_get(dev); | |
1025 | if (idev) { | |
1026 | mtu = idev->cnf.mtu6; | |
1027 | in6_dev_put(idev); | |
1028 | } | |
1029 | return mtu; | |
1030 | } | |
1031 | ||
1032 | int ipv6_get_hoplimit(struct net_device *dev) | |
1033 | { | |
1034 | int hoplimit = ipv6_devconf.hop_limit; | |
1035 | struct inet6_dev *idev; | |
1036 | ||
1037 | idev = in6_dev_get(dev); | |
1038 | if (idev) { | |
1039 | hoplimit = idev->cnf.hop_limit; | |
1040 | in6_dev_put(idev); | |
1041 | } | |
1042 | return hoplimit; | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * | |
1047 | */ | |
1048 | ||
86872cb5 | 1049 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1050 | { |
1051 | int err; | |
1da177e4 LT |
1052 | struct rt6_info *rt = NULL; |
1053 | struct net_device *dev = NULL; | |
1054 | struct inet6_dev *idev = NULL; | |
c71099ac | 1055 | struct fib6_table *table; |
1da177e4 LT |
1056 | int addr_type; |
1057 | ||
86872cb5 | 1058 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1059 | return -EINVAL; |
1060 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1061 | if (cfg->fc_src_len) |
1da177e4 LT |
1062 | return -EINVAL; |
1063 | #endif | |
86872cb5 | 1064 | if (cfg->fc_ifindex) { |
1da177e4 | 1065 | err = -ENODEV; |
881d966b | 1066 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
1da177e4 LT |
1067 | if (!dev) |
1068 | goto out; | |
1069 | idev = in6_dev_get(dev); | |
1070 | if (!idev) | |
1071 | goto out; | |
1072 | } | |
1073 | ||
86872cb5 TG |
1074 | if (cfg->fc_metric == 0) |
1075 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1076 | |
58f09b78 | 1077 | table = fib6_new_table(&init_net, cfg->fc_table); |
c71099ac TG |
1078 | if (table == NULL) { |
1079 | err = -ENOBUFS; | |
1080 | goto out; | |
1081 | } | |
1082 | ||
1da177e4 LT |
1083 | rt = ip6_dst_alloc(); |
1084 | ||
1085 | if (rt == NULL) { | |
1086 | err = -ENOMEM; | |
1087 | goto out; | |
1088 | } | |
1089 | ||
1090 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1091 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1092 | |
86872cb5 TG |
1093 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1094 | cfg->fc_protocol = RTPROT_BOOT; | |
1095 | rt->rt6i_protocol = cfg->fc_protocol; | |
1096 | ||
1097 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1098 | |
1099 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1100 | rt->u.dst.input = ip6_mc_input; | |
1101 | else | |
1102 | rt->u.dst.input = ip6_forward; | |
1103 | ||
1104 | rt->u.dst.output = ip6_output; | |
1105 | ||
86872cb5 TG |
1106 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1107 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1108 | if (rt->rt6i_dst.plen == 128) |
1109 | rt->u.dst.flags = DST_HOST; | |
1110 | ||
1111 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1112 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1113 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1114 | #endif |
1115 | ||
86872cb5 | 1116 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1117 | |
1118 | /* We cannot add true routes via loopback here, | |
1119 | they would result in kernel looping; promote them to reject routes | |
1120 | */ | |
86872cb5 | 1121 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1122 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1123 | /* hold loopback dev/idev if we haven't done so. */ | |
2774c7ab | 1124 | if (dev != init_net.loopback_dev) { |
1da177e4 LT |
1125 | if (dev) { |
1126 | dev_put(dev); | |
1127 | in6_dev_put(idev); | |
1128 | } | |
2774c7ab | 1129 | dev = init_net.loopback_dev; |
1da177e4 LT |
1130 | dev_hold(dev); |
1131 | idev = in6_dev_get(dev); | |
1132 | if (!idev) { | |
1133 | err = -ENODEV; | |
1134 | goto out; | |
1135 | } | |
1136 | } | |
1137 | rt->u.dst.output = ip6_pkt_discard_out; | |
1138 | rt->u.dst.input = ip6_pkt_discard; | |
1139 | rt->u.dst.error = -ENETUNREACH; | |
1140 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1141 | goto install_route; | |
1142 | } | |
1143 | ||
86872cb5 | 1144 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1145 | struct in6_addr *gw_addr; |
1146 | int gwa_type; | |
1147 | ||
86872cb5 TG |
1148 | gw_addr = &cfg->fc_gateway; |
1149 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1150 | gwa_type = ipv6_addr_type(gw_addr); |
1151 | ||
1152 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1153 | struct rt6_info *grt; | |
1154 | ||
1155 | /* IPv6 strictly inhibits using not link-local | |
1156 | addresses as nexthop address. | |
1157 | Otherwise, router will not able to send redirects. | |
1158 | It is very good, but in some (rare!) circumstances | |
1159 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1160 | some exceptions. --ANK | |
1161 | */ | |
1162 | err = -EINVAL; | |
1163 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1164 | goto out; | |
1165 | ||
606a2b48 | 1166 | grt = rt6_lookup(&init_net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1167 | |
1168 | err = -EHOSTUNREACH; | |
1169 | if (grt == NULL) | |
1170 | goto out; | |
1171 | if (dev) { | |
1172 | if (dev != grt->rt6i_dev) { | |
1173 | dst_release(&grt->u.dst); | |
1174 | goto out; | |
1175 | } | |
1176 | } else { | |
1177 | dev = grt->rt6i_dev; | |
1178 | idev = grt->rt6i_idev; | |
1179 | dev_hold(dev); | |
1180 | in6_dev_hold(grt->rt6i_idev); | |
1181 | } | |
1182 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1183 | err = 0; | |
1184 | dst_release(&grt->u.dst); | |
1185 | ||
1186 | if (err) | |
1187 | goto out; | |
1188 | } | |
1189 | err = -EINVAL; | |
1190 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1191 | goto out; | |
1192 | } | |
1193 | ||
1194 | err = -ENODEV; | |
1195 | if (dev == NULL) | |
1196 | goto out; | |
1197 | ||
86872cb5 | 1198 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1199 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1200 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1201 | err = PTR_ERR(rt->rt6i_nexthop); | |
1202 | rt->rt6i_nexthop = NULL; | |
1203 | goto out; | |
1204 | } | |
1205 | } | |
1206 | ||
86872cb5 | 1207 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1208 | |
1209 | install_route: | |
86872cb5 TG |
1210 | if (cfg->fc_mx) { |
1211 | struct nlattr *nla; | |
1212 | int remaining; | |
1213 | ||
1214 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1215 | int type = nla_type(nla); |
86872cb5 TG |
1216 | |
1217 | if (type) { | |
1218 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1219 | err = -EINVAL; |
1220 | goto out; | |
1221 | } | |
86872cb5 TG |
1222 | |
1223 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1224 | } |
1da177e4 LT |
1225 | } |
1226 | } | |
1227 | ||
1228 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1229 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1230 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1231 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1232 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1233 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1234 | rt->u.dst.dev = dev; | |
1235 | rt->rt6i_idev = idev; | |
c71099ac | 1236 | rt->rt6i_table = table; |
63152fc0 DL |
1237 | |
1238 | cfg->fc_nlinfo.nl_net = dev->nd_net; | |
1239 | ||
86872cb5 | 1240 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1241 | |
1242 | out: | |
1243 | if (dev) | |
1244 | dev_put(dev); | |
1245 | if (idev) | |
1246 | in6_dev_put(idev); | |
1247 | if (rt) | |
40aa7b90 | 1248 | dst_free(&rt->u.dst); |
1da177e4 LT |
1249 | return err; |
1250 | } | |
1251 | ||
86872cb5 | 1252 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1253 | { |
1254 | int err; | |
c71099ac | 1255 | struct fib6_table *table; |
1da177e4 | 1256 | |
6c813a72 PM |
1257 | if (rt == &ip6_null_entry) |
1258 | return -ENOENT; | |
1259 | ||
c71099ac TG |
1260 | table = rt->rt6i_table; |
1261 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1262 | |
86872cb5 | 1263 | err = fib6_del(rt, info); |
1da177e4 LT |
1264 | dst_release(&rt->u.dst); |
1265 | ||
c71099ac | 1266 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1267 | |
1268 | return err; | |
1269 | } | |
1270 | ||
e0a1ad73 TG |
1271 | int ip6_del_rt(struct rt6_info *rt) |
1272 | { | |
4d1169c1 DL |
1273 | struct nl_info info = { |
1274 | .nl_net = &init_net, | |
1275 | }; | |
528c4ceb | 1276 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1277 | } |
1278 | ||
86872cb5 | 1279 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1280 | { |
c71099ac | 1281 | struct fib6_table *table; |
1da177e4 LT |
1282 | struct fib6_node *fn; |
1283 | struct rt6_info *rt; | |
1284 | int err = -ESRCH; | |
1285 | ||
58f09b78 | 1286 | table = fib6_get_table(&init_net, cfg->fc_table); |
c71099ac TG |
1287 | if (table == NULL) |
1288 | return err; | |
1289 | ||
1290 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1291 | |
c71099ac | 1292 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1293 | &cfg->fc_dst, cfg->fc_dst_len, |
1294 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1295 | |
1da177e4 | 1296 | if (fn) { |
7cc48263 | 1297 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1298 | if (cfg->fc_ifindex && |
1da177e4 | 1299 | (rt->rt6i_dev == NULL || |
86872cb5 | 1300 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1301 | continue; |
86872cb5 TG |
1302 | if (cfg->fc_flags & RTF_GATEWAY && |
1303 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1304 | continue; |
86872cb5 | 1305 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1306 | continue; |
1307 | dst_hold(&rt->u.dst); | |
c71099ac | 1308 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1309 | |
86872cb5 | 1310 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1311 | } |
1312 | } | |
c71099ac | 1313 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1314 | |
1315 | return err; | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Handle redirects | |
1320 | */ | |
a6279458 YH |
1321 | struct ip6rd_flowi { |
1322 | struct flowi fl; | |
1323 | struct in6_addr gateway; | |
1324 | }; | |
1325 | ||
1326 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1327 | struct flowi *fl, | |
1328 | int flags) | |
1da177e4 | 1329 | { |
a6279458 YH |
1330 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1331 | struct rt6_info *rt; | |
e843b9e1 | 1332 | struct fib6_node *fn; |
c71099ac | 1333 | |
1da177e4 | 1334 | /* |
e843b9e1 YH |
1335 | * Get the "current" route for this destination and |
1336 | * check if the redirect has come from approriate router. | |
1337 | * | |
1338 | * RFC 2461 specifies that redirects should only be | |
1339 | * accepted if they come from the nexthop to the target. | |
1340 | * Due to the way the routes are chosen, this notion | |
1341 | * is a bit fuzzy and one might need to check all possible | |
1342 | * routes. | |
1da177e4 | 1343 | */ |
1da177e4 | 1344 | |
c71099ac | 1345 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1346 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1347 | restart: |
7cc48263 | 1348 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1349 | /* |
1350 | * Current route is on-link; redirect is always invalid. | |
1351 | * | |
1352 | * Seems, previous statement is not true. It could | |
1353 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1354 | * But then router serving it might decide, that we should | |
1355 | * know truth 8)8) --ANK (980726). | |
1356 | */ | |
1357 | if (rt6_check_expired(rt)) | |
1358 | continue; | |
1359 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1360 | continue; | |
a6279458 | 1361 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1362 | continue; |
a6279458 | 1363 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1364 | continue; |
1365 | break; | |
1366 | } | |
a6279458 | 1367 | |
cb15d9c2 | 1368 | if (!rt) |
a6279458 | 1369 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1370 | BACKTRACK(&fl->fl6_src); |
1371 | out: | |
a6279458 YH |
1372 | dst_hold(&rt->u.dst); |
1373 | ||
c71099ac | 1374 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1375 | |
a6279458 YH |
1376 | return rt; |
1377 | }; | |
1378 | ||
1379 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1380 | struct in6_addr *src, | |
1381 | struct in6_addr *gateway, | |
1382 | struct net_device *dev) | |
1383 | { | |
adaa70bb | 1384 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1385 | struct ip6rd_flowi rdfl = { |
1386 | .fl = { | |
1387 | .oif = dev->ifindex, | |
1388 | .nl_u = { | |
1389 | .ip6_u = { | |
1390 | .daddr = *dest, | |
1391 | .saddr = *src, | |
1392 | }, | |
1393 | }, | |
1394 | }, | |
1395 | .gateway = *gateway, | |
1396 | }; | |
adaa70bb TG |
1397 | |
1398 | if (rt6_need_strict(dest)) | |
1399 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1400 | |
58f09b78 DL |
1401 | return (struct rt6_info *)fib6_rule_lookup(&init_net, |
1402 | (struct flowi *)&rdfl, | |
1403 | flags, __ip6_route_redirect); | |
a6279458 YH |
1404 | } |
1405 | ||
1406 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1407 | struct in6_addr *saddr, | |
1408 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1409 | { | |
1410 | struct rt6_info *rt, *nrt = NULL; | |
1411 | struct netevent_redirect netevent; | |
1412 | ||
1413 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1414 | ||
1415 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1416 | if (net_ratelimit()) |
1417 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1418 | "for redirect target\n"); | |
a6279458 | 1419 | goto out; |
1da177e4 LT |
1420 | } |
1421 | ||
1da177e4 LT |
1422 | /* |
1423 | * We have finally decided to accept it. | |
1424 | */ | |
1425 | ||
1ab1457c | 1426 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1427 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1428 | NEIGH_UPDATE_F_OVERRIDE| | |
1429 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1430 | NEIGH_UPDATE_F_ISROUTER)) | |
1431 | ); | |
1432 | ||
1433 | /* | |
1434 | * Redirect received -> path was valid. | |
1435 | * Look, redirects are sent only in response to data packets, | |
1436 | * so that this nexthop apparently is reachable. --ANK | |
1437 | */ | |
1438 | dst_confirm(&rt->u.dst); | |
1439 | ||
1440 | /* Duplicate redirect: silently ignore. */ | |
1441 | if (neigh == rt->u.dst.neighbour) | |
1442 | goto out; | |
1443 | ||
1444 | nrt = ip6_rt_copy(rt); | |
1445 | if (nrt == NULL) | |
1446 | goto out; | |
1447 | ||
1448 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1449 | if (on_link) | |
1450 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1451 | ||
1452 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1453 | nrt->rt6i_dst.plen = 128; | |
1454 | nrt->u.dst.flags |= DST_HOST; | |
1455 | ||
1456 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1457 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1458 | /* Reset pmtu, it may be better */ | |
1459 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1460 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1461 | ||
40e22e8f | 1462 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1463 | goto out; |
1464 | ||
8d71740c TT |
1465 | netevent.old = &rt->u.dst; |
1466 | netevent.new = &nrt->u.dst; | |
1467 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1468 | ||
1da177e4 | 1469 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1470 | ip6_del_rt(rt); |
1da177e4 LT |
1471 | return; |
1472 | } | |
1473 | ||
1474 | out: | |
1ab1457c | 1475 | dst_release(&rt->u.dst); |
1da177e4 LT |
1476 | return; |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Handle ICMP "packet too big" messages | |
1481 | * i.e. Path MTU discovery | |
1482 | */ | |
1483 | ||
1484 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1485 | struct net_device *dev, u32 pmtu) | |
1486 | { | |
1487 | struct rt6_info *rt, *nrt; | |
1488 | int allfrag = 0; | |
1489 | ||
606a2b48 | 1490 | rt = rt6_lookup(dev->nd_net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1491 | if (rt == NULL) |
1492 | return; | |
1493 | ||
1494 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1495 | goto out; | |
1496 | ||
1497 | if (pmtu < IPV6_MIN_MTU) { | |
1498 | /* | |
1ab1457c | 1499 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1500 | * MTU (1280) and a fragment header should always be included |
1501 | * after a node receiving Too Big message reporting PMTU is | |
1502 | * less than the IPv6 Minimum Link MTU. | |
1503 | */ | |
1504 | pmtu = IPV6_MIN_MTU; | |
1505 | allfrag = 1; | |
1506 | } | |
1507 | ||
1508 | /* New mtu received -> path was valid. | |
1509 | They are sent only in response to data packets, | |
1510 | so that this nexthop apparently is reachable. --ANK | |
1511 | */ | |
1512 | dst_confirm(&rt->u.dst); | |
1513 | ||
1514 | /* Host route. If it is static, it would be better | |
1515 | not to override it, but add new one, so that | |
1516 | when cache entry will expire old pmtu | |
1517 | would return automatically. | |
1518 | */ | |
1519 | if (rt->rt6i_flags & RTF_CACHE) { | |
1520 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1521 | if (allfrag) | |
1522 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
4990509f | 1523 | dst_set_expires(&rt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1524 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1525 | goto out; | |
1526 | } | |
1527 | ||
1528 | /* Network route. | |
1529 | Two cases are possible: | |
1530 | 1. It is connected route. Action: COW | |
1531 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1532 | */ | |
d5315b50 | 1533 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1534 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1535 | else |
1536 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1537 | |
d5315b50 | 1538 | if (nrt) { |
a1e78363 YH |
1539 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1540 | if (allfrag) | |
1541 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1542 | ||
1543 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1544 | * happened within 5 mins, the recommended timer is 10 mins. | |
1545 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1546 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1547 | * and detecting PMTU increase will be automatically happened. | |
1548 | */ | |
4990509f | 1549 | dst_set_expires(&nrt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1550 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1551 | ||
40e22e8f | 1552 | ip6_ins_rt(nrt); |
1da177e4 | 1553 | } |
1da177e4 LT |
1554 | out: |
1555 | dst_release(&rt->u.dst); | |
1556 | } | |
1557 | ||
1558 | /* | |
1559 | * Misc support functions | |
1560 | */ | |
1561 | ||
1562 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1563 | { | |
1564 | struct rt6_info *rt = ip6_dst_alloc(); | |
1565 | ||
1566 | if (rt) { | |
1567 | rt->u.dst.input = ort->u.dst.input; | |
1568 | rt->u.dst.output = ort->u.dst.output; | |
1569 | ||
1570 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1571 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1572 | rt->u.dst.dev = ort->u.dst.dev; |
1573 | if (rt->u.dst.dev) | |
1574 | dev_hold(rt->u.dst.dev); | |
1575 | rt->rt6i_idev = ort->rt6i_idev; | |
1576 | if (rt->rt6i_idev) | |
1577 | in6_dev_hold(rt->rt6i_idev); | |
1578 | rt->u.dst.lastuse = jiffies; | |
1579 | rt->rt6i_expires = 0; | |
1580 | ||
1581 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1582 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1583 | rt->rt6i_metric = 0; | |
1584 | ||
1585 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1586 | #ifdef CONFIG_IPV6_SUBTREES | |
1587 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1588 | #endif | |
c71099ac | 1589 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1590 | } |
1591 | return rt; | |
1592 | } | |
1593 | ||
70ceb4f5 | 1594 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1595 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1596 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1597 | struct in6_addr *gwaddr, int ifindex) |
1598 | { | |
1599 | struct fib6_node *fn; | |
1600 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1601 | struct fib6_table *table; |
1602 | ||
efa2cea0 | 1603 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1604 | if (table == NULL) |
1605 | return NULL; | |
70ceb4f5 | 1606 | |
c71099ac TG |
1607 | write_lock_bh(&table->tb6_lock); |
1608 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1609 | if (!fn) |
1610 | goto out; | |
1611 | ||
7cc48263 | 1612 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1613 | if (rt->rt6i_dev->ifindex != ifindex) |
1614 | continue; | |
1615 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1616 | continue; | |
1617 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1618 | continue; | |
1619 | dst_hold(&rt->u.dst); | |
1620 | break; | |
1621 | } | |
1622 | out: | |
c71099ac | 1623 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1624 | return rt; |
1625 | } | |
1626 | ||
efa2cea0 DL |
1627 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1628 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1629 | struct in6_addr *gwaddr, int ifindex, |
1630 | unsigned pref) | |
1631 | { | |
86872cb5 TG |
1632 | struct fib6_config cfg = { |
1633 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1634 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1635 | .fc_ifindex = ifindex, |
1636 | .fc_dst_len = prefixlen, | |
1637 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1638 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1639 | .fc_nlinfo.pid = 0, |
1640 | .fc_nlinfo.nlh = NULL, | |
1641 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1642 | }; |
1643 | ||
1644 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1645 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1646 | |
e317da96 YH |
1647 | /* We should treat it as a default route if prefix length is 0. */ |
1648 | if (!prefixlen) | |
86872cb5 | 1649 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1650 | |
86872cb5 | 1651 | ip6_route_add(&cfg); |
70ceb4f5 | 1652 | |
efa2cea0 | 1653 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1654 | } |
1655 | #endif | |
1656 | ||
1da177e4 | 1657 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1658 | { |
1da177e4 | 1659 | struct rt6_info *rt; |
c71099ac | 1660 | struct fib6_table *table; |
1da177e4 | 1661 | |
58f09b78 | 1662 | table = fib6_get_table(&init_net, RT6_TABLE_DFLT); |
c71099ac TG |
1663 | if (table == NULL) |
1664 | return NULL; | |
1da177e4 | 1665 | |
c71099ac | 1666 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1667 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1668 | if (dev == rt->rt6i_dev && |
045927ff | 1669 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1670 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1671 | break; | |
1672 | } | |
1673 | if (rt) | |
1674 | dst_hold(&rt->u.dst); | |
c71099ac | 1675 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1676 | return rt; |
1677 | } | |
1678 | ||
c7dc89c0 FT |
1679 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1680 | ||
1da177e4 | 1681 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1682 | struct net_device *dev, |
1683 | unsigned int pref) | |
1da177e4 | 1684 | { |
86872cb5 TG |
1685 | struct fib6_config cfg = { |
1686 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1687 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1688 | .fc_ifindex = dev->ifindex, |
1689 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1690 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1691 | }; | |
1da177e4 | 1692 | |
86872cb5 | 1693 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1694 | |
86872cb5 | 1695 | ip6_route_add(&cfg); |
1da177e4 | 1696 | |
1da177e4 LT |
1697 | return rt6_get_dflt_router(gwaddr, dev); |
1698 | } | |
1699 | ||
7b4da532 | 1700 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1701 | { |
1702 | struct rt6_info *rt; | |
c71099ac TG |
1703 | struct fib6_table *table; |
1704 | ||
1705 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1706 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1707 | if (table == NULL) |
1708 | return; | |
1da177e4 LT |
1709 | |
1710 | restart: | |
c71099ac | 1711 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1712 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1713 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1714 | dst_hold(&rt->u.dst); | |
c71099ac | 1715 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1716 | ip6_del_rt(rt); |
1da177e4 LT |
1717 | goto restart; |
1718 | } | |
1719 | } | |
c71099ac | 1720 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1721 | } |
1722 | ||
86872cb5 TG |
1723 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1724 | struct fib6_config *cfg) | |
1725 | { | |
1726 | memset(cfg, 0, sizeof(*cfg)); | |
1727 | ||
1728 | cfg->fc_table = RT6_TABLE_MAIN; | |
1729 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1730 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1731 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1732 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1733 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1734 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1735 | ||
f1243c2d BT |
1736 | cfg->fc_nlinfo.nl_net = &init_net; |
1737 | ||
86872cb5 TG |
1738 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1739 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1740 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1741 | } | |
1742 | ||
1da177e4 LT |
1743 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1744 | { | |
86872cb5 | 1745 | struct fib6_config cfg; |
1da177e4 LT |
1746 | struct in6_rtmsg rtmsg; |
1747 | int err; | |
1748 | ||
1749 | switch(cmd) { | |
1750 | case SIOCADDRT: /* Add a route */ | |
1751 | case SIOCDELRT: /* Delete a route */ | |
1752 | if (!capable(CAP_NET_ADMIN)) | |
1753 | return -EPERM; | |
1754 | err = copy_from_user(&rtmsg, arg, | |
1755 | sizeof(struct in6_rtmsg)); | |
1756 | if (err) | |
1757 | return -EFAULT; | |
86872cb5 TG |
1758 | |
1759 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1760 | ||
1da177e4 LT |
1761 | rtnl_lock(); |
1762 | switch (cmd) { | |
1763 | case SIOCADDRT: | |
86872cb5 | 1764 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1765 | break; |
1766 | case SIOCDELRT: | |
86872cb5 | 1767 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1768 | break; |
1769 | default: | |
1770 | err = -EINVAL; | |
1771 | } | |
1772 | rtnl_unlock(); | |
1773 | ||
1774 | return err; | |
3ff50b79 | 1775 | } |
1da177e4 LT |
1776 | |
1777 | return -EINVAL; | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * Drop the packet on the floor | |
1782 | */ | |
1783 | ||
50eb431d | 1784 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1785 | { |
612f09e8 YH |
1786 | int type; |
1787 | switch (ipstats_mib_noroutes) { | |
1788 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1789 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1790 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1791 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1792 | break; | |
1793 | } | |
1794 | /* FALLTHROUGH */ | |
1795 | case IPSTATS_MIB_OUTNOROUTES: | |
1796 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1797 | break; | |
1798 | } | |
9ce8ade0 | 1799 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1800 | kfree_skb(skb); |
1801 | return 0; | |
1802 | } | |
1803 | ||
9ce8ade0 TG |
1804 | static int ip6_pkt_discard(struct sk_buff *skb) |
1805 | { | |
612f09e8 | 1806 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1807 | } |
1808 | ||
20380731 | 1809 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1810 | { |
1811 | skb->dev = skb->dst->dev; | |
612f09e8 | 1812 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1813 | } |
1814 | ||
6723ab54 DM |
1815 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1816 | ||
9ce8ade0 TG |
1817 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1818 | { | |
612f09e8 | 1819 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1820 | } |
1821 | ||
1822 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1823 | { | |
1824 | skb->dev = skb->dst->dev; | |
612f09e8 | 1825 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1826 | } |
1827 | ||
6723ab54 DM |
1828 | #endif |
1829 | ||
1da177e4 LT |
1830 | /* |
1831 | * Allocate a dst for local (unicast / anycast) address. | |
1832 | */ | |
1833 | ||
1834 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1835 | const struct in6_addr *addr, | |
1836 | int anycast) | |
1837 | { | |
1838 | struct rt6_info *rt = ip6_dst_alloc(); | |
1839 | ||
1840 | if (rt == NULL) | |
1841 | return ERR_PTR(-ENOMEM); | |
1842 | ||
2774c7ab | 1843 | dev_hold(init_net.loopback_dev); |
1da177e4 LT |
1844 | in6_dev_hold(idev); |
1845 | ||
1846 | rt->u.dst.flags = DST_HOST; | |
1847 | rt->u.dst.input = ip6_input; | |
1848 | rt->u.dst.output = ip6_output; | |
2774c7ab | 1849 | rt->rt6i_dev = init_net.loopback_dev; |
1da177e4 LT |
1850 | rt->rt6i_idev = idev; |
1851 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1852 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1853 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1854 | rt->u.dst.obsolete = -1; | |
1855 | ||
1856 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1857 | if (anycast) |
1858 | rt->rt6i_flags |= RTF_ANYCAST; | |
1859 | else | |
1da177e4 LT |
1860 | rt->rt6i_flags |= RTF_LOCAL; |
1861 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1862 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1863 | dst_free(&rt->u.dst); |
1da177e4 LT |
1864 | return ERR_PTR(-ENOMEM); |
1865 | } | |
1866 | ||
1867 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1868 | rt->rt6i_dst.plen = 128; | |
58f09b78 | 1869 | rt->rt6i_table = fib6_get_table(&init_net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1870 | |
1871 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1872 | ||
1873 | return rt; | |
1874 | } | |
1875 | ||
1876 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1877 | { | |
1878 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1879 | rt != &ip6_null_entry) { | |
1880 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1881 | return -1; | |
1882 | } | |
1883 | return 0; | |
1884 | } | |
1885 | ||
f3db4851 | 1886 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1887 | { |
f3db4851 | 1888 | fib6_clean_all(net, fib6_ifdown, 0, dev); |
1da177e4 LT |
1889 | } |
1890 | ||
1891 | struct rt6_mtu_change_arg | |
1892 | { | |
1893 | struct net_device *dev; | |
1894 | unsigned mtu; | |
1895 | }; | |
1896 | ||
1897 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1898 | { | |
1899 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1900 | struct inet6_dev *idev; | |
1901 | ||
1902 | /* In IPv6 pmtu discovery is not optional, | |
1903 | so that RTAX_MTU lock cannot disable it. | |
1904 | We still use this lock to block changes | |
1905 | caused by addrconf/ndisc. | |
1906 | */ | |
1907 | ||
1908 | idev = __in6_dev_get(arg->dev); | |
1909 | if (idev == NULL) | |
1910 | return 0; | |
1911 | ||
1912 | /* For administrative MTU increase, there is no way to discover | |
1913 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1914 | Since RFC 1981 doesn't include administrative MTU increase | |
1915 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1916 | */ | |
1917 | /* | |
1918 | If new MTU is less than route PMTU, this new MTU will be the | |
1919 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1920 | decreases; if new MTU is greater than route PMTU, and the | |
1921 | old MTU is the lowest MTU in the path, update the route PMTU | |
1922 | to reflect the increase. In this case if the other nodes' MTU | |
1923 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1924 | PMTU discouvery. | |
1925 | */ | |
1926 | if (rt->rt6i_dev == arg->dev && | |
1927 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1928 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1929 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1930 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1931 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
566cfd8f SA |
1932 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
1933 | } | |
1da177e4 LT |
1934 | return 0; |
1935 | } | |
1936 | ||
1937 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1938 | { | |
c71099ac TG |
1939 | struct rt6_mtu_change_arg arg = { |
1940 | .dev = dev, | |
1941 | .mtu = mtu, | |
1942 | }; | |
1da177e4 | 1943 | |
f3db4851 | 1944 | fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1945 | } |
1946 | ||
ef7c79ed | 1947 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1948 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1949 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1950 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1951 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1952 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1953 | }; | |
1954 | ||
1955 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1956 | struct fib6_config *cfg) | |
1da177e4 | 1957 | { |
86872cb5 TG |
1958 | struct rtmsg *rtm; |
1959 | struct nlattr *tb[RTA_MAX+1]; | |
1960 | int err; | |
1da177e4 | 1961 | |
86872cb5 TG |
1962 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1963 | if (err < 0) | |
1964 | goto errout; | |
1da177e4 | 1965 | |
86872cb5 TG |
1966 | err = -EINVAL; |
1967 | rtm = nlmsg_data(nlh); | |
1968 | memset(cfg, 0, sizeof(*cfg)); | |
1969 | ||
1970 | cfg->fc_table = rtm->rtm_table; | |
1971 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1972 | cfg->fc_src_len = rtm->rtm_src_len; | |
1973 | cfg->fc_flags = RTF_UP; | |
1974 | cfg->fc_protocol = rtm->rtm_protocol; | |
1975 | ||
1976 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1977 | cfg->fc_flags |= RTF_REJECT; | |
1978 | ||
1979 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1980 | cfg->fc_nlinfo.nlh = nlh; | |
2216b483 | 1981 | cfg->fc_nlinfo.nl_net = skb->sk->sk_net; |
86872cb5 TG |
1982 | |
1983 | if (tb[RTA_GATEWAY]) { | |
1984 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1985 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1986 | } |
86872cb5 TG |
1987 | |
1988 | if (tb[RTA_DST]) { | |
1989 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1990 | ||
1991 | if (nla_len(tb[RTA_DST]) < plen) | |
1992 | goto errout; | |
1993 | ||
1994 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1995 | } |
86872cb5 TG |
1996 | |
1997 | if (tb[RTA_SRC]) { | |
1998 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1999 | ||
2000 | if (nla_len(tb[RTA_SRC]) < plen) | |
2001 | goto errout; | |
2002 | ||
2003 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2004 | } |
86872cb5 TG |
2005 | |
2006 | if (tb[RTA_OIF]) | |
2007 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2008 | ||
2009 | if (tb[RTA_PRIORITY]) | |
2010 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2011 | ||
2012 | if (tb[RTA_METRICS]) { | |
2013 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2014 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2015 | } |
86872cb5 TG |
2016 | |
2017 | if (tb[RTA_TABLE]) | |
2018 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2019 | ||
2020 | err = 0; | |
2021 | errout: | |
2022 | return err; | |
1da177e4 LT |
2023 | } |
2024 | ||
c127ea2c | 2025 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2026 | { |
b854272b | 2027 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2028 | struct fib6_config cfg; |
2029 | int err; | |
1da177e4 | 2030 | |
b854272b DL |
2031 | if (net != &init_net) |
2032 | return -EINVAL; | |
2033 | ||
86872cb5 TG |
2034 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2035 | if (err < 0) | |
2036 | return err; | |
2037 | ||
2038 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2039 | } |
2040 | ||
c127ea2c | 2041 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2042 | { |
b854272b | 2043 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2044 | struct fib6_config cfg; |
2045 | int err; | |
1da177e4 | 2046 | |
b854272b DL |
2047 | if (net != &init_net) |
2048 | return -EINVAL; | |
2049 | ||
86872cb5 TG |
2050 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2051 | if (err < 0) | |
2052 | return err; | |
2053 | ||
2054 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2055 | } |
2056 | ||
339bf98f TG |
2057 | static inline size_t rt6_nlmsg_size(void) |
2058 | { | |
2059 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2060 | + nla_total_size(16) /* RTA_SRC */ | |
2061 | + nla_total_size(16) /* RTA_DST */ | |
2062 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2063 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2064 | + nla_total_size(4) /* RTA_TABLE */ | |
2065 | + nla_total_size(4) /* RTA_IIF */ | |
2066 | + nla_total_size(4) /* RTA_OIF */ | |
2067 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2068 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2069 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2070 | } | |
2071 | ||
1da177e4 | 2072 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2073 | struct in6_addr *dst, struct in6_addr *src, |
2074 | int iif, int type, u32 pid, u32 seq, | |
2075 | int prefix, unsigned int flags) | |
1da177e4 LT |
2076 | { |
2077 | struct rtmsg *rtm; | |
2d7202bf | 2078 | struct nlmsghdr *nlh; |
e3703b3d | 2079 | long expires; |
9e762a4a | 2080 | u32 table; |
1da177e4 LT |
2081 | |
2082 | if (prefix) { /* user wants prefix routes only */ | |
2083 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2084 | /* success since this is not a prefix route */ | |
2085 | return 1; | |
2086 | } | |
2087 | } | |
2088 | ||
2d7202bf TG |
2089 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2090 | if (nlh == NULL) | |
26932566 | 2091 | return -EMSGSIZE; |
2d7202bf TG |
2092 | |
2093 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2094 | rtm->rtm_family = AF_INET6; |
2095 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2096 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2097 | rtm->rtm_tos = 0; | |
c71099ac | 2098 | if (rt->rt6i_table) |
9e762a4a | 2099 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2100 | else |
9e762a4a PM |
2101 | table = RT6_TABLE_UNSPEC; |
2102 | rtm->rtm_table = table; | |
2d7202bf | 2103 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2104 | if (rt->rt6i_flags&RTF_REJECT) |
2105 | rtm->rtm_type = RTN_UNREACHABLE; | |
2106 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2107 | rtm->rtm_type = RTN_LOCAL; | |
2108 | else | |
2109 | rtm->rtm_type = RTN_UNICAST; | |
2110 | rtm->rtm_flags = 0; | |
2111 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2112 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2113 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2114 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2115 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2116 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2117 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2118 | rtm->rtm_protocol = RTPROT_RA; | |
2119 | ||
2120 | if (rt->rt6i_flags&RTF_CACHE) | |
2121 | rtm->rtm_flags |= RTM_F_CLONED; | |
2122 | ||
2123 | if (dst) { | |
2d7202bf | 2124 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2125 | rtm->rtm_dst_len = 128; |
1da177e4 | 2126 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2127 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2128 | #ifdef CONFIG_IPV6_SUBTREES |
2129 | if (src) { | |
2d7202bf | 2130 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2131 | rtm->rtm_src_len = 128; |
1da177e4 | 2132 | } else if (rtm->rtm_src_len) |
2d7202bf | 2133 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2134 | #endif |
2135 | if (iif) | |
2d7202bf | 2136 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2137 | else if (dst) { |
2138 | struct in6_addr saddr_buf; | |
5e5f3f0f YH |
2139 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
2140 | dst, &saddr_buf) == 0) | |
2d7202bf | 2141 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2142 | } |
2d7202bf | 2143 | |
1da177e4 | 2144 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2145 | goto nla_put_failure; |
2146 | ||
1da177e4 | 2147 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2148 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2149 | ||
1da177e4 | 2150 | if (rt->u.dst.dev) |
2d7202bf TG |
2151 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2152 | ||
2153 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2154 | |
2155 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2156 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2157 | expires, rt->u.dst.error) < 0) | |
2158 | goto nla_put_failure; | |
2d7202bf TG |
2159 | |
2160 | return nlmsg_end(skb, nlh); | |
2161 | ||
2162 | nla_put_failure: | |
26932566 PM |
2163 | nlmsg_cancel(skb, nlh); |
2164 | return -EMSGSIZE; | |
1da177e4 LT |
2165 | } |
2166 | ||
1b43af54 | 2167 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2168 | { |
2169 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2170 | int prefix; | |
2171 | ||
2d7202bf TG |
2172 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2173 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2174 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2175 | } else | |
2176 | prefix = 0; | |
2177 | ||
2178 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2179 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2180 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2181 | } |
2182 | ||
c127ea2c | 2183 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2184 | { |
b854272b | 2185 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2186 | struct nlattr *tb[RTA_MAX+1]; |
2187 | struct rt6_info *rt; | |
1da177e4 | 2188 | struct sk_buff *skb; |
ab364a6f | 2189 | struct rtmsg *rtm; |
1da177e4 | 2190 | struct flowi fl; |
ab364a6f | 2191 | int err, iif = 0; |
1da177e4 | 2192 | |
b854272b DL |
2193 | if (net != &init_net) |
2194 | return -EINVAL; | |
2195 | ||
ab364a6f TG |
2196 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2197 | if (err < 0) | |
2198 | goto errout; | |
1da177e4 | 2199 | |
ab364a6f | 2200 | err = -EINVAL; |
1da177e4 | 2201 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2202 | |
ab364a6f TG |
2203 | if (tb[RTA_SRC]) { |
2204 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2205 | goto errout; | |
2206 | ||
2207 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2208 | } | |
2209 | ||
2210 | if (tb[RTA_DST]) { | |
2211 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2212 | goto errout; | |
2213 | ||
2214 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2215 | } | |
2216 | ||
2217 | if (tb[RTA_IIF]) | |
2218 | iif = nla_get_u32(tb[RTA_IIF]); | |
2219 | ||
2220 | if (tb[RTA_OIF]) | |
2221 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2222 | |
2223 | if (iif) { | |
2224 | struct net_device *dev; | |
881d966b | 2225 | dev = __dev_get_by_index(&init_net, iif); |
1da177e4 LT |
2226 | if (!dev) { |
2227 | err = -ENODEV; | |
ab364a6f | 2228 | goto errout; |
1da177e4 LT |
2229 | } |
2230 | } | |
2231 | ||
ab364a6f TG |
2232 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2233 | if (skb == NULL) { | |
2234 | err = -ENOBUFS; | |
2235 | goto errout; | |
2236 | } | |
1da177e4 | 2237 | |
ab364a6f TG |
2238 | /* Reserve room for dummy headers, this skb can pass |
2239 | through good chunk of routing engine. | |
2240 | */ | |
459a98ed | 2241 | skb_reset_mac_header(skb); |
ab364a6f | 2242 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2243 | |
ab364a6f | 2244 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2245 | skb->dst = &rt->u.dst; |
2246 | ||
ab364a6f | 2247 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2248 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2249 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2250 | if (err < 0) { |
ab364a6f TG |
2251 | kfree_skb(skb); |
2252 | goto errout; | |
1da177e4 LT |
2253 | } |
2254 | ||
97c53cac | 2255 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2256 | errout: |
1da177e4 | 2257 | return err; |
1da177e4 LT |
2258 | } |
2259 | ||
86872cb5 | 2260 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2261 | { |
2262 | struct sk_buff *skb; | |
528c4ceb DL |
2263 | u32 seq; |
2264 | int err; | |
2265 | ||
2266 | err = -ENOBUFS; | |
2267 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2268 | |
339bf98f | 2269 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2270 | if (skb == NULL) |
2271 | goto errout; | |
2272 | ||
528c4ceb DL |
2273 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2274 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2275 | if (err < 0) { |
2276 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2277 | WARN_ON(err == -EMSGSIZE); | |
2278 | kfree_skb(skb); | |
2279 | goto errout; | |
2280 | } | |
528c4ceb DL |
2281 | err = rtnl_notify(skb, &init_net, info->pid, |
2282 | RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any()); | |
21713ebc TG |
2283 | errout: |
2284 | if (err < 0) | |
97c53cac | 2285 | rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2286 | } |
2287 | ||
2288 | /* | |
2289 | * /proc | |
2290 | */ | |
2291 | ||
2292 | #ifdef CONFIG_PROC_FS | |
2293 | ||
2294 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2295 | ||
2296 | struct rt6_proc_arg | |
2297 | { | |
2298 | char *buffer; | |
2299 | int offset; | |
2300 | int length; | |
2301 | int skip; | |
2302 | int len; | |
2303 | }; | |
2304 | ||
2305 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2306 | { | |
33120b30 | 2307 | struct seq_file *m = p_arg; |
1da177e4 | 2308 | |
33120b30 AD |
2309 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2310 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2311 | |
2312 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2313 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2314 | rt->rt6i_src.plen); | |
1da177e4 | 2315 | #else |
33120b30 | 2316 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2317 | #endif |
2318 | ||
2319 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2320 | seq_printf(m, NIP6_SEQFMT, |
2321 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2322 | } else { |
33120b30 | 2323 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2324 | } |
33120b30 AD |
2325 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2326 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2327 | rt->u.dst.__use, rt->rt6i_flags, | |
2328 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2329 | return 0; |
2330 | } | |
2331 | ||
33120b30 | 2332 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2333 | { |
f3db4851 DL |
2334 | struct net *net = (struct net *)m->private; |
2335 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2336 | return 0; |
2337 | } | |
1da177e4 | 2338 | |
33120b30 AD |
2339 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2340 | { | |
f3db4851 DL |
2341 | struct net *net = get_proc_net(inode); |
2342 | if (!net) | |
2343 | return -ENXIO; | |
2344 | return single_open(file, ipv6_route_show, net); | |
2345 | } | |
2346 | ||
2347 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2348 | { | |
2349 | struct seq_file *seq = file->private_data; | |
2350 | struct net *net = seq->private; | |
2351 | put_net(net); | |
2352 | return single_release(inode, file); | |
1da177e4 LT |
2353 | } |
2354 | ||
33120b30 AD |
2355 | static const struct file_operations ipv6_route_proc_fops = { |
2356 | .owner = THIS_MODULE, | |
2357 | .open = ipv6_route_open, | |
2358 | .read = seq_read, | |
2359 | .llseek = seq_lseek, | |
f3db4851 | 2360 | .release = ipv6_route_release, |
33120b30 AD |
2361 | }; |
2362 | ||
1da177e4 LT |
2363 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2364 | { | |
69ddb805 | 2365 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2366 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2367 | net->ipv6.rt6_stats->fib_nodes, |
2368 | net->ipv6.rt6_stats->fib_route_nodes, | |
2369 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2370 | net->ipv6.rt6_stats->fib_rt_entries, | |
2371 | net->ipv6.rt6_stats->fib_rt_cache, | |
c572872f | 2372 | atomic_read(&ip6_dst_ops.entries), |
69ddb805 | 2373 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2374 | |
2375 | return 0; | |
2376 | } | |
2377 | ||
2378 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2379 | { | |
69ddb805 DL |
2380 | struct net *net = get_proc_net(inode); |
2381 | return single_open(file, rt6_stats_seq_show, net); | |
2382 | } | |
2383 | ||
2384 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2385 | { | |
2386 | struct seq_file *seq = file->private_data; | |
2387 | struct net *net = (struct net *)seq->private; | |
2388 | put_net(net); | |
2389 | return single_release(inode, file); | |
1da177e4 LT |
2390 | } |
2391 | ||
9a32144e | 2392 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2393 | .owner = THIS_MODULE, |
2394 | .open = rt6_stats_seq_open, | |
2395 | .read = seq_read, | |
2396 | .llseek = seq_lseek, | |
69ddb805 | 2397 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2398 | }; |
2399 | #endif /* CONFIG_PROC_FS */ | |
2400 | ||
2401 | #ifdef CONFIG_SYSCTL | |
2402 | ||
1da177e4 LT |
2403 | static |
2404 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2405 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2406 | { | |
5b7c931d DL |
2407 | struct net *net = current->nsproxy->net_ns; |
2408 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2409 | if (write) { |
2410 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2411 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2412 | return 0; |
2413 | } else | |
2414 | return -EINVAL; | |
2415 | } | |
2416 | ||
760f2d01 | 2417 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2418 | { |
1da177e4 | 2419 | .procname = "flush", |
4990509f | 2420 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2421 | .maxlen = sizeof(int), |
89c8b3a1 | 2422 | .mode = 0200, |
1ab1457c | 2423 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2424 | }, |
2425 | { | |
2426 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2427 | .procname = "gc_thresh", | |
1ab1457c | 2428 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2429 | .maxlen = sizeof(int), |
2430 | .mode = 0644, | |
1ab1457c | 2431 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2432 | }, |
2433 | { | |
2434 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2435 | .procname = "max_size", | |
4990509f | 2436 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2437 | .maxlen = sizeof(int), |
2438 | .mode = 0644, | |
1ab1457c | 2439 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2440 | }, |
2441 | { | |
2442 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2443 | .procname = "gc_min_interval", | |
4990509f | 2444 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2445 | .maxlen = sizeof(int), |
2446 | .mode = 0644, | |
1ab1457c | 2447 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2448 | .strategy = &sysctl_jiffies, |
2449 | }, | |
2450 | { | |
2451 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2452 | .procname = "gc_timeout", | |
4990509f | 2453 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2454 | .maxlen = sizeof(int), |
2455 | .mode = 0644, | |
1ab1457c | 2456 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2457 | .strategy = &sysctl_jiffies, |
2458 | }, | |
2459 | { | |
2460 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2461 | .procname = "gc_interval", | |
4990509f | 2462 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2463 | .maxlen = sizeof(int), |
2464 | .mode = 0644, | |
1ab1457c | 2465 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2466 | .strategy = &sysctl_jiffies, |
2467 | }, | |
2468 | { | |
2469 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2470 | .procname = "gc_elasticity", | |
4990509f | 2471 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2472 | .maxlen = sizeof(int), |
2473 | .mode = 0644, | |
1ab1457c | 2474 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2475 | .strategy = &sysctl_jiffies, |
2476 | }, | |
2477 | { | |
2478 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2479 | .procname = "mtu_expires", | |
4990509f | 2480 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2481 | .maxlen = sizeof(int), |
2482 | .mode = 0644, | |
1ab1457c | 2483 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2484 | .strategy = &sysctl_jiffies, |
2485 | }, | |
2486 | { | |
2487 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2488 | .procname = "min_adv_mss", | |
4990509f | 2489 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2490 | .maxlen = sizeof(int), |
2491 | .mode = 0644, | |
1ab1457c | 2492 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2493 | .strategy = &sysctl_jiffies, |
2494 | }, | |
2495 | { | |
2496 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2497 | .procname = "gc_min_interval_ms", | |
4990509f | 2498 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2499 | .maxlen = sizeof(int), |
2500 | .mode = 0644, | |
1ab1457c | 2501 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2502 | .strategy = &sysctl_ms_jiffies, |
2503 | }, | |
2504 | { .ctl_name = 0 } | |
2505 | }; | |
2506 | ||
760f2d01 DL |
2507 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2508 | { | |
2509 | struct ctl_table *table; | |
2510 | ||
2511 | table = kmemdup(ipv6_route_table_template, | |
2512 | sizeof(ipv6_route_table_template), | |
2513 | GFP_KERNEL); | |
5ee09105 YH |
2514 | |
2515 | if (table) { | |
2516 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
2517 | /* table[1].data will be handled when we have | |
2518 | routes per namespace */ | |
2519 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; | |
2520 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2521 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2522 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2523 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2524 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2525 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2526 | } | |
2527 | ||
760f2d01 DL |
2528 | return table; |
2529 | } | |
1da177e4 LT |
2530 | #endif |
2531 | ||
cdb18761 DL |
2532 | static int ip6_route_net_init(struct net *net) |
2533 | { | |
2534 | #ifdef CONFIG_PROC_FS | |
2535 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2536 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2537 | #endif | |
2538 | return 0; | |
2539 | } | |
2540 | ||
2541 | static void ip6_route_net_exit(struct net *net) | |
2542 | { | |
2543 | #ifdef CONFIG_PROC_FS | |
2544 | proc_net_remove(net, "ipv6_route"); | |
2545 | proc_net_remove(net, "rt6_stats"); | |
2546 | #endif | |
2547 | } | |
2548 | ||
2549 | static struct pernet_operations ip6_route_net_ops = { | |
2550 | .init = ip6_route_net_init, | |
2551 | .exit = ip6_route_net_exit, | |
2552 | }; | |
2553 | ||
433d49c3 | 2554 | int __init ip6_route_init(void) |
1da177e4 | 2555 | { |
433d49c3 DL |
2556 | int ret; |
2557 | ||
e5d679f3 AD |
2558 | ip6_dst_ops.kmem_cachep = |
2559 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
f845ab6b DL |
2560 | SLAB_HWCACHE_ALIGN, NULL); |
2561 | if (!ip6_dst_ops.kmem_cachep) | |
2562 | return -ENOMEM; | |
2563 | ||
14e50e57 DM |
2564 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2565 | ||
433d49c3 DL |
2566 | ret = fib6_init(); |
2567 | if (ret) | |
2568 | goto out_kmem_cache; | |
2569 | ||
433d49c3 DL |
2570 | ret = xfrm6_init(); |
2571 | if (ret) | |
cdb18761 | 2572 | goto out_fib6_init; |
c35b7e72 | 2573 | |
433d49c3 DL |
2574 | ret = fib6_rules_init(); |
2575 | if (ret) | |
2576 | goto xfrm6_init; | |
7e5449c2 | 2577 | |
433d49c3 DL |
2578 | ret = -ENOBUFS; |
2579 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2580 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2581 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2582 | goto fib6_rules_init; | |
c127ea2c | 2583 | |
cdb18761 DL |
2584 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2585 | if (ret) | |
2586 | goto fib6_rules_init; | |
433d49c3 DL |
2587 | out: |
2588 | return ret; | |
2589 | ||
2590 | fib6_rules_init: | |
433d49c3 DL |
2591 | fib6_rules_cleanup(); |
2592 | xfrm6_init: | |
433d49c3 | 2593 | xfrm6_fini(); |
433d49c3 | 2594 | out_fib6_init: |
f3db4851 | 2595 | rt6_ifdown(&init_net, NULL); |
433d49c3 DL |
2596 | fib6_gc_cleanup(); |
2597 | out_kmem_cache: | |
2598 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2599 | goto out; | |
1da177e4 LT |
2600 | } |
2601 | ||
2602 | void ip6_route_cleanup(void) | |
2603 | { | |
cdb18761 | 2604 | unregister_pernet_subsys(&ip6_route_net_ops); |
101367c2 | 2605 | fib6_rules_cleanup(); |
1da177e4 | 2606 | xfrm6_fini(); |
f3db4851 | 2607 | rt6_ifdown(&init_net, NULL); |
1da177e4 LT |
2608 | fib6_gc_cleanup(); |
2609 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2610 | } |