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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 | 40 | #include <linux/if_arp.h> |
1da177e4 LT |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> | |
5b7c931d | 43 | #include <linux/nsproxy.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
519fbd87 | 75 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 76 | |
1da177e4 LT |
77 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
78 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
89 | ||
70ceb4f5 YH |
90 | #ifdef CONFIG_IPV6_ROUTE_INFO |
91 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
92 | struct in6_addr *gwaddr, int ifindex, | |
93 | unsigned pref); | |
94 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
95 | struct in6_addr *gwaddr, int ifindex); | |
96 | #endif | |
97 | ||
1da177e4 LT |
98 | static struct dst_ops ip6_dst_ops = { |
99 | .family = AF_INET6, | |
100 | .protocol = __constant_htons(ETH_P_IPV6), | |
101 | .gc = ip6_dst_gc, | |
102 | .gc_thresh = 1024, | |
103 | .check = ip6_dst_check, | |
104 | .destroy = ip6_dst_destroy, | |
105 | .ifdown = ip6_dst_ifdown, | |
106 | .negative_advice = ip6_negative_advice, | |
107 | .link_failure = ip6_link_failure, | |
108 | .update_pmtu = ip6_rt_update_pmtu, | |
862b82c6 | 109 | .local_out = ip6_local_out, |
1da177e4 | 110 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 111 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
112 | }; |
113 | ||
14e50e57 DM |
114 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
115 | { | |
116 | } | |
117 | ||
118 | static struct dst_ops ip6_dst_blackhole_ops = { | |
119 | .family = AF_INET6, | |
120 | .protocol = __constant_htons(ETH_P_IPV6), | |
121 | .destroy = ip6_dst_destroy, | |
122 | .check = ip6_dst_check, | |
123 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
124 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 125 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
126 | }; |
127 | ||
1da177e4 LT |
128 | struct rt6_info ip6_null_entry = { |
129 | .u = { | |
130 | .dst = { | |
131 | .__refcnt = ATOMIC_INIT(1), | |
132 | .__use = 1, | |
1da177e4 LT |
133 | .obsolete = -1, |
134 | .error = -ENETUNREACH, | |
135 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
136 | .input = ip6_pkt_discard, | |
137 | .output = ip6_pkt_discard_out, | |
138 | .ops = &ip6_dst_ops, | |
139 | .path = (struct dst_entry*)&ip6_null_entry, | |
140 | } | |
141 | }, | |
142 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
143 | .rt6i_metric = ~(u32) 0, | |
144 | .rt6i_ref = ATOMIC_INIT(1), | |
145 | }; | |
146 | ||
101367c2 TG |
147 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
148 | ||
6723ab54 DM |
149 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
150 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 151 | |
101367c2 TG |
152 | struct rt6_info ip6_prohibit_entry = { |
153 | .u = { | |
154 | .dst = { | |
155 | .__refcnt = ATOMIC_INIT(1), | |
156 | .__use = 1, | |
101367c2 TG |
157 | .obsolete = -1, |
158 | .error = -EACCES, | |
159 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
160 | .input = ip6_pkt_prohibit, |
161 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
162 | .ops = &ip6_dst_ops, |
163 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
164 | } | |
165 | }, | |
166 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
167 | .rt6i_metric = ~(u32) 0, | |
168 | .rt6i_ref = ATOMIC_INIT(1), | |
169 | }; | |
170 | ||
171 | struct rt6_info ip6_blk_hole_entry = { | |
172 | .u = { | |
173 | .dst = { | |
174 | .__refcnt = ATOMIC_INIT(1), | |
175 | .__use = 1, | |
101367c2 TG |
176 | .obsolete = -1, |
177 | .error = -EINVAL, | |
178 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
179 | .input = dst_discard, |
180 | .output = dst_discard, | |
101367c2 TG |
181 | .ops = &ip6_dst_ops, |
182 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
183 | } | |
184 | }, | |
185 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
186 | .rt6i_metric = ~(u32) 0, | |
187 | .rt6i_ref = ATOMIC_INIT(1), | |
188 | }; | |
189 | ||
190 | #endif | |
191 | ||
1da177e4 LT |
192 | /* allocate dst with ip6_dst_ops */ |
193 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
194 | { | |
195 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
196 | } | |
197 | ||
198 | static void ip6_dst_destroy(struct dst_entry *dst) | |
199 | { | |
200 | struct rt6_info *rt = (struct rt6_info *)dst; | |
201 | struct inet6_dev *idev = rt->rt6i_idev; | |
202 | ||
203 | if (idev != NULL) { | |
204 | rt->rt6i_idev = NULL; | |
205 | in6_dev_put(idev); | |
1ab1457c | 206 | } |
1da177e4 LT |
207 | } |
208 | ||
209 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
210 | int how) | |
211 | { | |
212 | struct rt6_info *rt = (struct rt6_info *)dst; | |
213 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
214 | struct net_device *loopback_dev = |
215 | dev->nd_net->loopback_dev; | |
1da177e4 | 216 | |
5a3e55d6 DL |
217 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
218 | struct inet6_dev *loopback_idev = | |
219 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
220 | if (loopback_idev != NULL) { |
221 | rt->rt6i_idev = loopback_idev; | |
222 | in6_dev_put(idev); | |
223 | } | |
224 | } | |
225 | } | |
226 | ||
227 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
228 | { | |
229 | return (rt->rt6i_flags & RTF_EXPIRES && | |
230 | time_after(jiffies, rt->rt6i_expires)); | |
231 | } | |
232 | ||
c71099ac TG |
233 | static inline int rt6_need_strict(struct in6_addr *daddr) |
234 | { | |
235 | return (ipv6_addr_type(daddr) & | |
236 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
237 | } | |
238 | ||
1da177e4 | 239 | /* |
c71099ac | 240 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
241 | */ |
242 | ||
243 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
244 | int oif, | |
245 | int strict) | |
246 | { | |
247 | struct rt6_info *local = NULL; | |
248 | struct rt6_info *sprt; | |
249 | ||
250 | if (oif) { | |
7cc48263 | 251 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
252 | struct net_device *dev = sprt->rt6i_dev; |
253 | if (dev->ifindex == oif) | |
254 | return sprt; | |
255 | if (dev->flags & IFF_LOOPBACK) { | |
256 | if (sprt->rt6i_idev == NULL || | |
257 | sprt->rt6i_idev->dev->ifindex != oif) { | |
258 | if (strict && oif) | |
259 | continue; | |
1ab1457c | 260 | if (local && (!oif || |
1da177e4 LT |
261 | local->rt6i_idev->dev->ifindex == oif)) |
262 | continue; | |
263 | } | |
264 | local = sprt; | |
265 | } | |
266 | } | |
267 | ||
268 | if (local) | |
269 | return local; | |
270 | ||
271 | if (strict) | |
272 | return &ip6_null_entry; | |
273 | } | |
274 | return rt; | |
275 | } | |
276 | ||
27097255 YH |
277 | #ifdef CONFIG_IPV6_ROUTER_PREF |
278 | static void rt6_probe(struct rt6_info *rt) | |
279 | { | |
280 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
281 | /* | |
282 | * Okay, this does not seem to be appropriate | |
283 | * for now, however, we need to check if it | |
284 | * is really so; aka Router Reachability Probing. | |
285 | * | |
286 | * Router Reachability Probe MUST be rate-limited | |
287 | * to no more than one per minute. | |
288 | */ | |
289 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
290 | return; | |
291 | read_lock_bh(&neigh->lock); | |
292 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 293 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
294 | struct in6_addr mcaddr; |
295 | struct in6_addr *target; | |
296 | ||
297 | neigh->updated = jiffies; | |
298 | read_unlock_bh(&neigh->lock); | |
299 | ||
300 | target = (struct in6_addr *)&neigh->primary_key; | |
301 | addrconf_addr_solict_mult(target, &mcaddr); | |
302 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
303 | } else | |
304 | read_unlock_bh(&neigh->lock); | |
305 | } | |
306 | #else | |
307 | static inline void rt6_probe(struct rt6_info *rt) | |
308 | { | |
309 | return; | |
310 | } | |
311 | #endif | |
312 | ||
1da177e4 | 313 | /* |
554cfb7e | 314 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 315 | */ |
b6f99a21 | 316 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
317 | { |
318 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 319 | if (!oif || dev->ifindex == oif) |
554cfb7e | 320 | return 2; |
161980f4 DM |
321 | if ((dev->flags & IFF_LOOPBACK) && |
322 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
323 | return 1; | |
324 | return 0; | |
554cfb7e | 325 | } |
1da177e4 | 326 | |
b6f99a21 | 327 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 328 | { |
554cfb7e | 329 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 330 | int m; |
4d0c5911 YH |
331 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
332 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
333 | m = 1; | |
334 | else if (neigh) { | |
554cfb7e YH |
335 | read_lock_bh(&neigh->lock); |
336 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 337 | m = 2; |
398bcbeb YH |
338 | #ifdef CONFIG_IPV6_ROUTER_PREF |
339 | else if (neigh->nud_state & NUD_FAILED) | |
340 | m = 0; | |
341 | #endif | |
342 | else | |
ea73ee23 | 343 | m = 1; |
554cfb7e | 344 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
345 | } else |
346 | m = 0; | |
554cfb7e | 347 | return m; |
1da177e4 LT |
348 | } |
349 | ||
554cfb7e YH |
350 | static int rt6_score_route(struct rt6_info *rt, int oif, |
351 | int strict) | |
1da177e4 | 352 | { |
4d0c5911 | 353 | int m, n; |
1ab1457c | 354 | |
4d0c5911 | 355 | m = rt6_check_dev(rt, oif); |
77d16f45 | 356 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 357 | return -1; |
ebacaaa0 YH |
358 | #ifdef CONFIG_IPV6_ROUTER_PREF |
359 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
360 | #endif | |
4d0c5911 | 361 | n = rt6_check_neigh(rt); |
557e92ef | 362 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
363 | return -1; |
364 | return m; | |
365 | } | |
366 | ||
f11e6659 DM |
367 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
368 | int *mpri, struct rt6_info *match) | |
554cfb7e | 369 | { |
f11e6659 DM |
370 | int m; |
371 | ||
372 | if (rt6_check_expired(rt)) | |
373 | goto out; | |
374 | ||
375 | m = rt6_score_route(rt, oif, strict); | |
376 | if (m < 0) | |
377 | goto out; | |
378 | ||
379 | if (m > *mpri) { | |
380 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
381 | rt6_probe(match); | |
382 | *mpri = m; | |
383 | match = rt; | |
384 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
385 | rt6_probe(rt); | |
386 | } | |
387 | ||
388 | out: | |
389 | return match; | |
390 | } | |
391 | ||
392 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
393 | struct rt6_info *rr_head, | |
394 | u32 metric, int oif, int strict) | |
395 | { | |
396 | struct rt6_info *rt, *match; | |
554cfb7e | 397 | int mpri = -1; |
1da177e4 | 398 | |
f11e6659 DM |
399 | match = NULL; |
400 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
401 | rt = rt->u.dst.rt6_next) | |
402 | match = find_match(rt, oif, strict, &mpri, match); | |
403 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
404 | rt = rt->u.dst.rt6_next) | |
405 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 406 | |
f11e6659 DM |
407 | return match; |
408 | } | |
1da177e4 | 409 | |
f11e6659 DM |
410 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
411 | { | |
412 | struct rt6_info *match, *rt0; | |
1da177e4 | 413 | |
f11e6659 DM |
414 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
415 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 416 | |
f11e6659 DM |
417 | rt0 = fn->rr_ptr; |
418 | if (!rt0) | |
419 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 420 | |
f11e6659 | 421 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 422 | |
554cfb7e | 423 | if (!match && |
f11e6659 DM |
424 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
425 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
426 | ||
554cfb7e | 427 | /* no entries matched; do round-robin */ |
f11e6659 DM |
428 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
429 | next = fn->leaf; | |
430 | ||
431 | if (next != rt0) | |
432 | fn->rr_ptr = next; | |
1da177e4 | 433 | } |
1da177e4 | 434 | |
f11e6659 DM |
435 | RT6_TRACE("%s() => %p\n", |
436 | __FUNCTION__, match); | |
1da177e4 | 437 | |
554cfb7e | 438 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
439 | } |
440 | ||
70ceb4f5 YH |
441 | #ifdef CONFIG_IPV6_ROUTE_INFO |
442 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
443 | struct in6_addr *gwaddr) | |
444 | { | |
445 | struct route_info *rinfo = (struct route_info *) opt; | |
446 | struct in6_addr prefix_buf, *prefix; | |
447 | unsigned int pref; | |
448 | u32 lifetime; | |
449 | struct rt6_info *rt; | |
450 | ||
451 | if (len < sizeof(struct route_info)) { | |
452 | return -EINVAL; | |
453 | } | |
454 | ||
455 | /* Sanity check for prefix_len and length */ | |
456 | if (rinfo->length > 3) { | |
457 | return -EINVAL; | |
458 | } else if (rinfo->prefix_len > 128) { | |
459 | return -EINVAL; | |
460 | } else if (rinfo->prefix_len > 64) { | |
461 | if (rinfo->length < 2) { | |
462 | return -EINVAL; | |
463 | } | |
464 | } else if (rinfo->prefix_len > 0) { | |
465 | if (rinfo->length < 1) { | |
466 | return -EINVAL; | |
467 | } | |
468 | } | |
469 | ||
470 | pref = rinfo->route_pref; | |
471 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
472 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
473 | ||
e69a4adc | 474 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
475 | if (lifetime == 0xffffffff) { |
476 | /* infinity */ | |
477 | } else if (lifetime > 0x7fffffff/HZ) { | |
478 | /* Avoid arithmetic overflow */ | |
479 | lifetime = 0x7fffffff/HZ - 1; | |
480 | } | |
481 | ||
482 | if (rinfo->length == 3) | |
483 | prefix = (struct in6_addr *)rinfo->prefix; | |
484 | else { | |
485 | /* this function is safe */ | |
486 | ipv6_addr_prefix(&prefix_buf, | |
487 | (struct in6_addr *)rinfo->prefix, | |
488 | rinfo->prefix_len); | |
489 | prefix = &prefix_buf; | |
490 | } | |
491 | ||
492 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
493 | ||
494 | if (rt && !lifetime) { | |
e0a1ad73 | 495 | ip6_del_rt(rt); |
70ceb4f5 YH |
496 | rt = NULL; |
497 | } | |
498 | ||
499 | if (!rt && lifetime) | |
500 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
501 | pref); | |
502 | else if (rt) | |
503 | rt->rt6i_flags = RTF_ROUTEINFO | | |
504 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
505 | ||
506 | if (rt) { | |
507 | if (lifetime == 0xffffffff) { | |
508 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
509 | } else { | |
510 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
511 | rt->rt6i_flags |= RTF_EXPIRES; | |
512 | } | |
513 | dst_release(&rt->u.dst); | |
514 | } | |
515 | return 0; | |
516 | } | |
517 | #endif | |
518 | ||
982f56f3 YH |
519 | #define BACKTRACK(saddr) \ |
520 | do { \ | |
521 | if (rt == &ip6_null_entry) { \ | |
522 | struct fib6_node *pn; \ | |
e0eda7bb | 523 | while (1) { \ |
982f56f3 YH |
524 | if (fn->fn_flags & RTN_TL_ROOT) \ |
525 | goto out; \ | |
526 | pn = fn->parent; \ | |
527 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 528 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
529 | else \ |
530 | fn = pn; \ | |
531 | if (fn->fn_flags & RTN_RTINFO) \ | |
532 | goto restart; \ | |
c71099ac | 533 | } \ |
c71099ac | 534 | } \ |
982f56f3 | 535 | } while(0) |
c71099ac TG |
536 | |
537 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
538 | struct flowi *fl, int flags) | |
1da177e4 LT |
539 | { |
540 | struct fib6_node *fn; | |
541 | struct rt6_info *rt; | |
542 | ||
c71099ac TG |
543 | read_lock_bh(&table->tb6_lock); |
544 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
545 | restart: | |
546 | rt = fn->leaf; | |
77d16f45 | 547 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 548 | BACKTRACK(&fl->fl6_src); |
c71099ac | 549 | out: |
03f49f34 | 550 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 551 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
552 | return rt; |
553 | ||
554 | } | |
555 | ||
606a2b48 DL |
556 | struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr, |
557 | struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
558 | { |
559 | struct flowi fl = { | |
560 | .oif = oif, | |
561 | .nl_u = { | |
562 | .ip6_u = { | |
563 | .daddr = *daddr, | |
c71099ac TG |
564 | }, |
565 | }, | |
566 | }; | |
567 | struct dst_entry *dst; | |
77d16f45 | 568 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 569 | |
adaa70bb TG |
570 | if (saddr) { |
571 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
572 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
573 | } | |
574 | ||
606a2b48 | 575 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
576 | if (dst->error == 0) |
577 | return (struct rt6_info *) dst; | |
578 | ||
579 | dst_release(dst); | |
580 | ||
1da177e4 LT |
581 | return NULL; |
582 | } | |
583 | ||
7159039a YH |
584 | EXPORT_SYMBOL(rt6_lookup); |
585 | ||
c71099ac | 586 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
587 | It takes new route entry, the addition fails by any reason the |
588 | route is freed. In any case, if caller does not hold it, it may | |
589 | be destroyed. | |
590 | */ | |
591 | ||
86872cb5 | 592 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
593 | { |
594 | int err; | |
c71099ac | 595 | struct fib6_table *table; |
1da177e4 | 596 | |
c71099ac TG |
597 | table = rt->rt6i_table; |
598 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 599 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 600 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
601 | |
602 | return err; | |
603 | } | |
604 | ||
40e22e8f TG |
605 | int ip6_ins_rt(struct rt6_info *rt) |
606 | { | |
4d1169c1 DL |
607 | struct nl_info info = { |
608 | .nl_net = &init_net, | |
609 | }; | |
528c4ceb | 610 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
611 | } |
612 | ||
95a9a5ba YH |
613 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
614 | struct in6_addr *saddr) | |
1da177e4 | 615 | { |
1da177e4 LT |
616 | struct rt6_info *rt; |
617 | ||
618 | /* | |
619 | * Clone the route. | |
620 | */ | |
621 | ||
622 | rt = ip6_rt_copy(ort); | |
623 | ||
624 | if (rt) { | |
58c4fb86 YH |
625 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
626 | if (rt->rt6i_dst.plen != 128 && | |
627 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
628 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 629 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 630 | } |
1da177e4 | 631 | |
58c4fb86 | 632 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
633 | rt->rt6i_dst.plen = 128; |
634 | rt->rt6i_flags |= RTF_CACHE; | |
635 | rt->u.dst.flags |= DST_HOST; | |
636 | ||
637 | #ifdef CONFIG_IPV6_SUBTREES | |
638 | if (rt->rt6i_src.plen && saddr) { | |
639 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
640 | rt->rt6i_src.plen = 128; | |
641 | } | |
642 | #endif | |
643 | ||
644 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
645 | ||
95a9a5ba | 646 | } |
1da177e4 | 647 | |
95a9a5ba YH |
648 | return rt; |
649 | } | |
1da177e4 | 650 | |
299d9939 YH |
651 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
652 | { | |
653 | struct rt6_info *rt = ip6_rt_copy(ort); | |
654 | if (rt) { | |
655 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
656 | rt->rt6i_dst.plen = 128; | |
657 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
658 | rt->u.dst.flags |= DST_HOST; |
659 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
660 | } | |
661 | return rt; | |
662 | } | |
663 | ||
4acad72d | 664 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, |
8ce11e6a | 665 | struct flowi *fl, int flags) |
1da177e4 LT |
666 | { |
667 | struct fib6_node *fn; | |
519fbd87 | 668 | struct rt6_info *rt, *nrt; |
c71099ac | 669 | int strict = 0; |
1da177e4 | 670 | int attempts = 3; |
519fbd87 | 671 | int err; |
ea659e07 | 672 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 673 | |
77d16f45 | 674 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
675 | |
676 | relookup: | |
c71099ac | 677 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 678 | |
8238dd06 | 679 | restart_2: |
c71099ac | 680 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
681 | |
682 | restart: | |
4acad72d | 683 | rt = rt6_select(fn, oif, strict | reachable); |
982f56f3 | 684 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
685 | if (rt == &ip6_null_entry || |
686 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 687 | goto out; |
1da177e4 | 688 | |
fb9de91e | 689 | dst_hold(&rt->u.dst); |
c71099ac | 690 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 691 | |
519fbd87 | 692 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 693 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
694 | else { |
695 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 696 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
697 | #else |
698 | goto out2; | |
699 | #endif | |
700 | } | |
e40cf353 | 701 | |
519fbd87 YH |
702 | dst_release(&rt->u.dst); |
703 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 704 | |
519fbd87 YH |
705 | dst_hold(&rt->u.dst); |
706 | if (nrt) { | |
40e22e8f | 707 | err = ip6_ins_rt(nrt); |
519fbd87 | 708 | if (!err) |
1da177e4 | 709 | goto out2; |
1da177e4 | 710 | } |
1da177e4 | 711 | |
519fbd87 YH |
712 | if (--attempts <= 0) |
713 | goto out2; | |
714 | ||
715 | /* | |
c71099ac | 716 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
717 | * released someone could insert this route. Relookup. |
718 | */ | |
719 | dst_release(&rt->u.dst); | |
720 | goto relookup; | |
721 | ||
722 | out: | |
8238dd06 YH |
723 | if (reachable) { |
724 | reachable = 0; | |
725 | goto restart_2; | |
726 | } | |
519fbd87 | 727 | dst_hold(&rt->u.dst); |
c71099ac | 728 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
729 | out2: |
730 | rt->u.dst.lastuse = jiffies; | |
731 | rt->u.dst.__use++; | |
c71099ac TG |
732 | |
733 | return rt; | |
1da177e4 LT |
734 | } |
735 | ||
4acad72d PE |
736 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
737 | struct flowi *fl, int flags) | |
738 | { | |
739 | return ip6_pol_route(table, fl->iif, fl, flags); | |
740 | } | |
741 | ||
c71099ac TG |
742 | void ip6_route_input(struct sk_buff *skb) |
743 | { | |
0660e03f | 744 | struct ipv6hdr *iph = ipv6_hdr(skb); |
adaa70bb | 745 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
746 | struct flowi fl = { |
747 | .iif = skb->dev->ifindex, | |
748 | .nl_u = { | |
749 | .ip6_u = { | |
750 | .daddr = iph->daddr, | |
751 | .saddr = iph->saddr, | |
90bcaf7b | 752 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
753 | }, |
754 | }, | |
1ab1457c | 755 | .mark = skb->mark, |
c71099ac TG |
756 | .proto = iph->nexthdr, |
757 | }; | |
adaa70bb TG |
758 | |
759 | if (rt6_need_strict(&iph->daddr)) | |
760 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 761 | |
58f09b78 | 762 | skb->dst = fib6_rule_lookup(&init_net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
763 | } |
764 | ||
765 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
766 | struct flowi *fl, int flags) | |
1da177e4 | 767 | { |
4acad72d | 768 | return ip6_pol_route(table, fl->oif, fl, flags); |
c71099ac TG |
769 | } |
770 | ||
771 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
772 | { | |
773 | int flags = 0; | |
774 | ||
775 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 776 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 777 | |
adaa70bb TG |
778 | if (!ipv6_addr_any(&fl->fl6_src)) |
779 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
780 | ||
58f09b78 | 781 | return fib6_rule_lookup(&init_net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
782 | } |
783 | ||
7159039a | 784 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 785 | |
14e50e57 DM |
786 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
787 | { | |
788 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
789 | struct rt6_info *rt = (struct rt6_info *) | |
790 | dst_alloc(&ip6_dst_blackhole_ops); | |
791 | struct dst_entry *new = NULL; | |
792 | ||
793 | if (rt) { | |
794 | new = &rt->u.dst; | |
795 | ||
796 | atomic_set(&new->__refcnt, 1); | |
797 | new->__use = 1; | |
352e512c HX |
798 | new->input = dst_discard; |
799 | new->output = dst_discard; | |
14e50e57 DM |
800 | |
801 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
802 | new->dev = ort->u.dst.dev; | |
803 | if (new->dev) | |
804 | dev_hold(new->dev); | |
805 | rt->rt6i_idev = ort->rt6i_idev; | |
806 | if (rt->rt6i_idev) | |
807 | in6_dev_hold(rt->rt6i_idev); | |
808 | rt->rt6i_expires = 0; | |
809 | ||
810 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
811 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
812 | rt->rt6i_metric = 0; | |
813 | ||
814 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
815 | #ifdef CONFIG_IPV6_SUBTREES | |
816 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
817 | #endif | |
818 | ||
819 | dst_free(new); | |
820 | } | |
821 | ||
822 | dst_release(*dstp); | |
823 | *dstp = new; | |
824 | return (new ? 0 : -ENOMEM); | |
825 | } | |
826 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
827 | ||
1da177e4 LT |
828 | /* |
829 | * Destination cache support functions | |
830 | */ | |
831 | ||
832 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
833 | { | |
834 | struct rt6_info *rt; | |
835 | ||
836 | rt = (struct rt6_info *) dst; | |
837 | ||
838 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
839 | return dst; | |
840 | ||
841 | return NULL; | |
842 | } | |
843 | ||
844 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
845 | { | |
846 | struct rt6_info *rt = (struct rt6_info *) dst; | |
847 | ||
848 | if (rt) { | |
849 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 850 | ip6_del_rt(rt); |
1da177e4 LT |
851 | else |
852 | dst_release(dst); | |
853 | } | |
854 | return NULL; | |
855 | } | |
856 | ||
857 | static void ip6_link_failure(struct sk_buff *skb) | |
858 | { | |
859 | struct rt6_info *rt; | |
860 | ||
861 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
862 | ||
863 | rt = (struct rt6_info *) skb->dst; | |
864 | if (rt) { | |
865 | if (rt->rt6i_flags&RTF_CACHE) { | |
866 | dst_set_expires(&rt->u.dst, 0); | |
867 | rt->rt6i_flags |= RTF_EXPIRES; | |
868 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
869 | rt->rt6i_node->fn_sernum = -1; | |
870 | } | |
871 | } | |
872 | ||
873 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
874 | { | |
875 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
876 | ||
877 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
878 | rt6->rt6i_flags |= RTF_MODIFIED; | |
879 | if (mtu < IPV6_MIN_MTU) { | |
880 | mtu = IPV6_MIN_MTU; | |
881 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
882 | } | |
883 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 884 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
885 | } |
886 | } | |
887 | ||
1da177e4 LT |
888 | static int ipv6_get_mtu(struct net_device *dev); |
889 | ||
890 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
891 | { | |
892 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
893 | ||
4990509f DL |
894 | if (mtu < init_net.ipv6.sysctl.ip6_rt_min_advmss) |
895 | mtu = init_net.ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
896 | |
897 | /* | |
1ab1457c YH |
898 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
899 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
900 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
901 | * rely only on pmtu discovery" |
902 | */ | |
903 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
904 | mtu = IPV6_MAXPLEN; | |
905 | return mtu; | |
906 | } | |
907 | ||
3b00944c YH |
908 | static struct dst_entry *icmp6_dst_gc_list; |
909 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 910 | |
3b00944c | 911 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 912 | struct neighbour *neigh, |
3b00944c | 913 | struct in6_addr *addr) |
1da177e4 LT |
914 | { |
915 | struct rt6_info *rt; | |
916 | struct inet6_dev *idev = in6_dev_get(dev); | |
917 | ||
918 | if (unlikely(idev == NULL)) | |
919 | return NULL; | |
920 | ||
921 | rt = ip6_dst_alloc(); | |
922 | if (unlikely(rt == NULL)) { | |
923 | in6_dev_put(idev); | |
924 | goto out; | |
925 | } | |
926 | ||
927 | dev_hold(dev); | |
928 | if (neigh) | |
929 | neigh_hold(neigh); | |
930 | else | |
931 | neigh = ndisc_get_neigh(dev, addr); | |
932 | ||
933 | rt->rt6i_dev = dev; | |
934 | rt->rt6i_idev = idev; | |
935 | rt->rt6i_nexthop = neigh; | |
936 | atomic_set(&rt->u.dst.__refcnt, 1); | |
937 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
938 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
939 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
3b00944c | 940 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
941 | |
942 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
943 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
944 | ? DST_HOST | |
1da177e4 LT |
945 | : 0; |
946 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
947 | rt->rt6i_dst.plen = 128; | |
948 | #endif | |
949 | ||
3b00944c YH |
950 | spin_lock_bh(&icmp6_dst_lock); |
951 | rt->u.dst.next = icmp6_dst_gc_list; | |
952 | icmp6_dst_gc_list = &rt->u.dst; | |
953 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 954 | |
63152fc0 | 955 | fib6_force_start_gc(dev->nd_net); |
1da177e4 LT |
956 | |
957 | out: | |
40aa7b90 | 958 | return &rt->u.dst; |
1da177e4 LT |
959 | } |
960 | ||
3b00944c | 961 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
962 | { |
963 | struct dst_entry *dst, *next, **pprev; | |
964 | int freed; | |
965 | ||
966 | next = NULL; | |
1ab1457c | 967 | freed = 0; |
5d0bbeeb | 968 | |
3b00944c YH |
969 | spin_lock_bh(&icmp6_dst_lock); |
970 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 971 | |
1da177e4 LT |
972 | while ((dst = *pprev) != NULL) { |
973 | if (!atomic_read(&dst->__refcnt)) { | |
974 | *pprev = dst->next; | |
975 | dst_free(dst); | |
976 | freed++; | |
977 | } else { | |
978 | pprev = &dst->next; | |
979 | (*more)++; | |
980 | } | |
981 | } | |
982 | ||
3b00944c | 983 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 984 | |
1da177e4 LT |
985 | return freed; |
986 | } | |
987 | ||
569d3645 | 988 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 LT |
989 | { |
990 | static unsigned expire = 30*HZ; | |
991 | static unsigned long last_gc; | |
992 | unsigned long now = jiffies; | |
993 | ||
4990509f DL |
994 | if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && |
995 | atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) | |
1da177e4 LT |
996 | goto out; |
997 | ||
998 | expire++; | |
5b7c931d | 999 | fib6_run_gc(expire, &init_net); |
1da177e4 LT |
1000 | last_gc = now; |
1001 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
4990509f | 1002 | expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; |
1da177e4 LT |
1003 | |
1004 | out: | |
4990509f DL |
1005 | expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; |
1006 | return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size); | |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1010 | but results in cleaner routing tables. | |
1011 | ||
1012 | Remove it only when all the things will work! | |
1013 | */ | |
1014 | ||
1015 | static int ipv6_get_mtu(struct net_device *dev) | |
1016 | { | |
1017 | int mtu = IPV6_MIN_MTU; | |
1018 | struct inet6_dev *idev; | |
1019 | ||
1020 | idev = in6_dev_get(dev); | |
1021 | if (idev) { | |
1022 | mtu = idev->cnf.mtu6; | |
1023 | in6_dev_put(idev); | |
1024 | } | |
1025 | return mtu; | |
1026 | } | |
1027 | ||
1028 | int ipv6_get_hoplimit(struct net_device *dev) | |
1029 | { | |
1030 | int hoplimit = ipv6_devconf.hop_limit; | |
1031 | struct inet6_dev *idev; | |
1032 | ||
1033 | idev = in6_dev_get(dev); | |
1034 | if (idev) { | |
1035 | hoplimit = idev->cnf.hop_limit; | |
1036 | in6_dev_put(idev); | |
1037 | } | |
1038 | return hoplimit; | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * | |
1043 | */ | |
1044 | ||
86872cb5 | 1045 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1046 | { |
1047 | int err; | |
1da177e4 LT |
1048 | struct rt6_info *rt = NULL; |
1049 | struct net_device *dev = NULL; | |
1050 | struct inet6_dev *idev = NULL; | |
c71099ac | 1051 | struct fib6_table *table; |
1da177e4 LT |
1052 | int addr_type; |
1053 | ||
86872cb5 | 1054 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1055 | return -EINVAL; |
1056 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1057 | if (cfg->fc_src_len) |
1da177e4 LT |
1058 | return -EINVAL; |
1059 | #endif | |
86872cb5 | 1060 | if (cfg->fc_ifindex) { |
1da177e4 | 1061 | err = -ENODEV; |
881d966b | 1062 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
1da177e4 LT |
1063 | if (!dev) |
1064 | goto out; | |
1065 | idev = in6_dev_get(dev); | |
1066 | if (!idev) | |
1067 | goto out; | |
1068 | } | |
1069 | ||
86872cb5 TG |
1070 | if (cfg->fc_metric == 0) |
1071 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1072 | |
58f09b78 | 1073 | table = fib6_new_table(&init_net, cfg->fc_table); |
c71099ac TG |
1074 | if (table == NULL) { |
1075 | err = -ENOBUFS; | |
1076 | goto out; | |
1077 | } | |
1078 | ||
1da177e4 LT |
1079 | rt = ip6_dst_alloc(); |
1080 | ||
1081 | if (rt == NULL) { | |
1082 | err = -ENOMEM; | |
1083 | goto out; | |
1084 | } | |
1085 | ||
1086 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1087 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1088 | |
86872cb5 TG |
1089 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1090 | cfg->fc_protocol = RTPROT_BOOT; | |
1091 | rt->rt6i_protocol = cfg->fc_protocol; | |
1092 | ||
1093 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1094 | |
1095 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1096 | rt->u.dst.input = ip6_mc_input; | |
1097 | else | |
1098 | rt->u.dst.input = ip6_forward; | |
1099 | ||
1100 | rt->u.dst.output = ip6_output; | |
1101 | ||
86872cb5 TG |
1102 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1103 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1104 | if (rt->rt6i_dst.plen == 128) |
1105 | rt->u.dst.flags = DST_HOST; | |
1106 | ||
1107 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1108 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1109 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1110 | #endif |
1111 | ||
86872cb5 | 1112 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1113 | |
1114 | /* We cannot add true routes via loopback here, | |
1115 | they would result in kernel looping; promote them to reject routes | |
1116 | */ | |
86872cb5 | 1117 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1118 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1119 | /* hold loopback dev/idev if we haven't done so. */ | |
2774c7ab | 1120 | if (dev != init_net.loopback_dev) { |
1da177e4 LT |
1121 | if (dev) { |
1122 | dev_put(dev); | |
1123 | in6_dev_put(idev); | |
1124 | } | |
2774c7ab | 1125 | dev = init_net.loopback_dev; |
1da177e4 LT |
1126 | dev_hold(dev); |
1127 | idev = in6_dev_get(dev); | |
1128 | if (!idev) { | |
1129 | err = -ENODEV; | |
1130 | goto out; | |
1131 | } | |
1132 | } | |
1133 | rt->u.dst.output = ip6_pkt_discard_out; | |
1134 | rt->u.dst.input = ip6_pkt_discard; | |
1135 | rt->u.dst.error = -ENETUNREACH; | |
1136 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1137 | goto install_route; | |
1138 | } | |
1139 | ||
86872cb5 | 1140 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1141 | struct in6_addr *gw_addr; |
1142 | int gwa_type; | |
1143 | ||
86872cb5 TG |
1144 | gw_addr = &cfg->fc_gateway; |
1145 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1146 | gwa_type = ipv6_addr_type(gw_addr); |
1147 | ||
1148 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1149 | struct rt6_info *grt; | |
1150 | ||
1151 | /* IPv6 strictly inhibits using not link-local | |
1152 | addresses as nexthop address. | |
1153 | Otherwise, router will not able to send redirects. | |
1154 | It is very good, but in some (rare!) circumstances | |
1155 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1156 | some exceptions. --ANK | |
1157 | */ | |
1158 | err = -EINVAL; | |
1159 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1160 | goto out; | |
1161 | ||
606a2b48 | 1162 | grt = rt6_lookup(&init_net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1163 | |
1164 | err = -EHOSTUNREACH; | |
1165 | if (grt == NULL) | |
1166 | goto out; | |
1167 | if (dev) { | |
1168 | if (dev != grt->rt6i_dev) { | |
1169 | dst_release(&grt->u.dst); | |
1170 | goto out; | |
1171 | } | |
1172 | } else { | |
1173 | dev = grt->rt6i_dev; | |
1174 | idev = grt->rt6i_idev; | |
1175 | dev_hold(dev); | |
1176 | in6_dev_hold(grt->rt6i_idev); | |
1177 | } | |
1178 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1179 | err = 0; | |
1180 | dst_release(&grt->u.dst); | |
1181 | ||
1182 | if (err) | |
1183 | goto out; | |
1184 | } | |
1185 | err = -EINVAL; | |
1186 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1187 | goto out; | |
1188 | } | |
1189 | ||
1190 | err = -ENODEV; | |
1191 | if (dev == NULL) | |
1192 | goto out; | |
1193 | ||
86872cb5 | 1194 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1195 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1196 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1197 | err = PTR_ERR(rt->rt6i_nexthop); | |
1198 | rt->rt6i_nexthop = NULL; | |
1199 | goto out; | |
1200 | } | |
1201 | } | |
1202 | ||
86872cb5 | 1203 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1204 | |
1205 | install_route: | |
86872cb5 TG |
1206 | if (cfg->fc_mx) { |
1207 | struct nlattr *nla; | |
1208 | int remaining; | |
1209 | ||
1210 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1211 | int type = nla_type(nla); |
86872cb5 TG |
1212 | |
1213 | if (type) { | |
1214 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1215 | err = -EINVAL; |
1216 | goto out; | |
1217 | } | |
86872cb5 TG |
1218 | |
1219 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1220 | } |
1da177e4 LT |
1221 | } |
1222 | } | |
1223 | ||
1224 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1225 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1226 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1227 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1228 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1229 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1230 | rt->u.dst.dev = dev; | |
1231 | rt->rt6i_idev = idev; | |
c71099ac | 1232 | rt->rt6i_table = table; |
63152fc0 DL |
1233 | |
1234 | cfg->fc_nlinfo.nl_net = dev->nd_net; | |
1235 | ||
86872cb5 | 1236 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1237 | |
1238 | out: | |
1239 | if (dev) | |
1240 | dev_put(dev); | |
1241 | if (idev) | |
1242 | in6_dev_put(idev); | |
1243 | if (rt) | |
40aa7b90 | 1244 | dst_free(&rt->u.dst); |
1da177e4 LT |
1245 | return err; |
1246 | } | |
1247 | ||
86872cb5 | 1248 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1249 | { |
1250 | int err; | |
c71099ac | 1251 | struct fib6_table *table; |
1da177e4 | 1252 | |
6c813a72 PM |
1253 | if (rt == &ip6_null_entry) |
1254 | return -ENOENT; | |
1255 | ||
c71099ac TG |
1256 | table = rt->rt6i_table; |
1257 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1258 | |
86872cb5 | 1259 | err = fib6_del(rt, info); |
1da177e4 LT |
1260 | dst_release(&rt->u.dst); |
1261 | ||
c71099ac | 1262 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1263 | |
1264 | return err; | |
1265 | } | |
1266 | ||
e0a1ad73 TG |
1267 | int ip6_del_rt(struct rt6_info *rt) |
1268 | { | |
4d1169c1 DL |
1269 | struct nl_info info = { |
1270 | .nl_net = &init_net, | |
1271 | }; | |
528c4ceb | 1272 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1273 | } |
1274 | ||
86872cb5 | 1275 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1276 | { |
c71099ac | 1277 | struct fib6_table *table; |
1da177e4 LT |
1278 | struct fib6_node *fn; |
1279 | struct rt6_info *rt; | |
1280 | int err = -ESRCH; | |
1281 | ||
58f09b78 | 1282 | table = fib6_get_table(&init_net, cfg->fc_table); |
c71099ac TG |
1283 | if (table == NULL) |
1284 | return err; | |
1285 | ||
1286 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1287 | |
c71099ac | 1288 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1289 | &cfg->fc_dst, cfg->fc_dst_len, |
1290 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1291 | |
1da177e4 | 1292 | if (fn) { |
7cc48263 | 1293 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1294 | if (cfg->fc_ifindex && |
1da177e4 | 1295 | (rt->rt6i_dev == NULL || |
86872cb5 | 1296 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1297 | continue; |
86872cb5 TG |
1298 | if (cfg->fc_flags & RTF_GATEWAY && |
1299 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1300 | continue; |
86872cb5 | 1301 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1302 | continue; |
1303 | dst_hold(&rt->u.dst); | |
c71099ac | 1304 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1305 | |
86872cb5 | 1306 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1307 | } |
1308 | } | |
c71099ac | 1309 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1310 | |
1311 | return err; | |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * Handle redirects | |
1316 | */ | |
a6279458 YH |
1317 | struct ip6rd_flowi { |
1318 | struct flowi fl; | |
1319 | struct in6_addr gateway; | |
1320 | }; | |
1321 | ||
1322 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1323 | struct flowi *fl, | |
1324 | int flags) | |
1da177e4 | 1325 | { |
a6279458 YH |
1326 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1327 | struct rt6_info *rt; | |
e843b9e1 | 1328 | struct fib6_node *fn; |
c71099ac | 1329 | |
1da177e4 | 1330 | /* |
e843b9e1 YH |
1331 | * Get the "current" route for this destination and |
1332 | * check if the redirect has come from approriate router. | |
1333 | * | |
1334 | * RFC 2461 specifies that redirects should only be | |
1335 | * accepted if they come from the nexthop to the target. | |
1336 | * Due to the way the routes are chosen, this notion | |
1337 | * is a bit fuzzy and one might need to check all possible | |
1338 | * routes. | |
1da177e4 | 1339 | */ |
1da177e4 | 1340 | |
c71099ac | 1341 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1342 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1343 | restart: |
7cc48263 | 1344 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1345 | /* |
1346 | * Current route is on-link; redirect is always invalid. | |
1347 | * | |
1348 | * Seems, previous statement is not true. It could | |
1349 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1350 | * But then router serving it might decide, that we should | |
1351 | * know truth 8)8) --ANK (980726). | |
1352 | */ | |
1353 | if (rt6_check_expired(rt)) | |
1354 | continue; | |
1355 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1356 | continue; | |
a6279458 | 1357 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1358 | continue; |
a6279458 | 1359 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1360 | continue; |
1361 | break; | |
1362 | } | |
a6279458 | 1363 | |
cb15d9c2 | 1364 | if (!rt) |
a6279458 | 1365 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1366 | BACKTRACK(&fl->fl6_src); |
1367 | out: | |
a6279458 YH |
1368 | dst_hold(&rt->u.dst); |
1369 | ||
c71099ac | 1370 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1371 | |
a6279458 YH |
1372 | return rt; |
1373 | }; | |
1374 | ||
1375 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1376 | struct in6_addr *src, | |
1377 | struct in6_addr *gateway, | |
1378 | struct net_device *dev) | |
1379 | { | |
adaa70bb | 1380 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1381 | struct ip6rd_flowi rdfl = { |
1382 | .fl = { | |
1383 | .oif = dev->ifindex, | |
1384 | .nl_u = { | |
1385 | .ip6_u = { | |
1386 | .daddr = *dest, | |
1387 | .saddr = *src, | |
1388 | }, | |
1389 | }, | |
1390 | }, | |
1391 | .gateway = *gateway, | |
1392 | }; | |
adaa70bb TG |
1393 | |
1394 | if (rt6_need_strict(dest)) | |
1395 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1396 | |
58f09b78 DL |
1397 | return (struct rt6_info *)fib6_rule_lookup(&init_net, |
1398 | (struct flowi *)&rdfl, | |
1399 | flags, __ip6_route_redirect); | |
a6279458 YH |
1400 | } |
1401 | ||
1402 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1403 | struct in6_addr *saddr, | |
1404 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1405 | { | |
1406 | struct rt6_info *rt, *nrt = NULL; | |
1407 | struct netevent_redirect netevent; | |
1408 | ||
1409 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1410 | ||
1411 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1412 | if (net_ratelimit()) |
1413 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1414 | "for redirect target\n"); | |
a6279458 | 1415 | goto out; |
1da177e4 LT |
1416 | } |
1417 | ||
1da177e4 LT |
1418 | /* |
1419 | * We have finally decided to accept it. | |
1420 | */ | |
1421 | ||
1ab1457c | 1422 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1423 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1424 | NEIGH_UPDATE_F_OVERRIDE| | |
1425 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1426 | NEIGH_UPDATE_F_ISROUTER)) | |
1427 | ); | |
1428 | ||
1429 | /* | |
1430 | * Redirect received -> path was valid. | |
1431 | * Look, redirects are sent only in response to data packets, | |
1432 | * so that this nexthop apparently is reachable. --ANK | |
1433 | */ | |
1434 | dst_confirm(&rt->u.dst); | |
1435 | ||
1436 | /* Duplicate redirect: silently ignore. */ | |
1437 | if (neigh == rt->u.dst.neighbour) | |
1438 | goto out; | |
1439 | ||
1440 | nrt = ip6_rt_copy(rt); | |
1441 | if (nrt == NULL) | |
1442 | goto out; | |
1443 | ||
1444 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1445 | if (on_link) | |
1446 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1447 | ||
1448 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1449 | nrt->rt6i_dst.plen = 128; | |
1450 | nrt->u.dst.flags |= DST_HOST; | |
1451 | ||
1452 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1453 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1454 | /* Reset pmtu, it may be better */ | |
1455 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1456 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1457 | ||
40e22e8f | 1458 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1459 | goto out; |
1460 | ||
8d71740c TT |
1461 | netevent.old = &rt->u.dst; |
1462 | netevent.new = &nrt->u.dst; | |
1463 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1464 | ||
1da177e4 | 1465 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1466 | ip6_del_rt(rt); |
1da177e4 LT |
1467 | return; |
1468 | } | |
1469 | ||
1470 | out: | |
1ab1457c | 1471 | dst_release(&rt->u.dst); |
1da177e4 LT |
1472 | return; |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Handle ICMP "packet too big" messages | |
1477 | * i.e. Path MTU discovery | |
1478 | */ | |
1479 | ||
1480 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1481 | struct net_device *dev, u32 pmtu) | |
1482 | { | |
1483 | struct rt6_info *rt, *nrt; | |
1484 | int allfrag = 0; | |
1485 | ||
606a2b48 | 1486 | rt = rt6_lookup(dev->nd_net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1487 | if (rt == NULL) |
1488 | return; | |
1489 | ||
1490 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1491 | goto out; | |
1492 | ||
1493 | if (pmtu < IPV6_MIN_MTU) { | |
1494 | /* | |
1ab1457c | 1495 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1496 | * MTU (1280) and a fragment header should always be included |
1497 | * after a node receiving Too Big message reporting PMTU is | |
1498 | * less than the IPv6 Minimum Link MTU. | |
1499 | */ | |
1500 | pmtu = IPV6_MIN_MTU; | |
1501 | allfrag = 1; | |
1502 | } | |
1503 | ||
1504 | /* New mtu received -> path was valid. | |
1505 | They are sent only in response to data packets, | |
1506 | so that this nexthop apparently is reachable. --ANK | |
1507 | */ | |
1508 | dst_confirm(&rt->u.dst); | |
1509 | ||
1510 | /* Host route. If it is static, it would be better | |
1511 | not to override it, but add new one, so that | |
1512 | when cache entry will expire old pmtu | |
1513 | would return automatically. | |
1514 | */ | |
1515 | if (rt->rt6i_flags & RTF_CACHE) { | |
1516 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1517 | if (allfrag) | |
1518 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
4990509f | 1519 | dst_set_expires(&rt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1520 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1521 | goto out; | |
1522 | } | |
1523 | ||
1524 | /* Network route. | |
1525 | Two cases are possible: | |
1526 | 1. It is connected route. Action: COW | |
1527 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1528 | */ | |
d5315b50 | 1529 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1530 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1531 | else |
1532 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1533 | |
d5315b50 | 1534 | if (nrt) { |
a1e78363 YH |
1535 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1536 | if (allfrag) | |
1537 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1538 | ||
1539 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1540 | * happened within 5 mins, the recommended timer is 10 mins. | |
1541 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1542 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1543 | * and detecting PMTU increase will be automatically happened. | |
1544 | */ | |
4990509f | 1545 | dst_set_expires(&nrt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1546 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1547 | ||
40e22e8f | 1548 | ip6_ins_rt(nrt); |
1da177e4 | 1549 | } |
1da177e4 LT |
1550 | out: |
1551 | dst_release(&rt->u.dst); | |
1552 | } | |
1553 | ||
1554 | /* | |
1555 | * Misc support functions | |
1556 | */ | |
1557 | ||
1558 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1559 | { | |
1560 | struct rt6_info *rt = ip6_dst_alloc(); | |
1561 | ||
1562 | if (rt) { | |
1563 | rt->u.dst.input = ort->u.dst.input; | |
1564 | rt->u.dst.output = ort->u.dst.output; | |
1565 | ||
1566 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1567 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1568 | rt->u.dst.dev = ort->u.dst.dev; |
1569 | if (rt->u.dst.dev) | |
1570 | dev_hold(rt->u.dst.dev); | |
1571 | rt->rt6i_idev = ort->rt6i_idev; | |
1572 | if (rt->rt6i_idev) | |
1573 | in6_dev_hold(rt->rt6i_idev); | |
1574 | rt->u.dst.lastuse = jiffies; | |
1575 | rt->rt6i_expires = 0; | |
1576 | ||
1577 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1578 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1579 | rt->rt6i_metric = 0; | |
1580 | ||
1581 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1582 | #ifdef CONFIG_IPV6_SUBTREES | |
1583 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1584 | #endif | |
c71099ac | 1585 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1586 | } |
1587 | return rt; | |
1588 | } | |
1589 | ||
70ceb4f5 YH |
1590 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1591 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1592 | struct in6_addr *gwaddr, int ifindex) | |
1593 | { | |
1594 | struct fib6_node *fn; | |
1595 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1596 | struct fib6_table *table; |
1597 | ||
58f09b78 | 1598 | table = fib6_get_table(&init_net, RT6_TABLE_INFO); |
c71099ac TG |
1599 | if (table == NULL) |
1600 | return NULL; | |
70ceb4f5 | 1601 | |
c71099ac TG |
1602 | write_lock_bh(&table->tb6_lock); |
1603 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1604 | if (!fn) |
1605 | goto out; | |
1606 | ||
7cc48263 | 1607 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1608 | if (rt->rt6i_dev->ifindex != ifindex) |
1609 | continue; | |
1610 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1611 | continue; | |
1612 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1613 | continue; | |
1614 | dst_hold(&rt->u.dst); | |
1615 | break; | |
1616 | } | |
1617 | out: | |
c71099ac | 1618 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1619 | return rt; |
1620 | } | |
1621 | ||
1622 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1623 | struct in6_addr *gwaddr, int ifindex, | |
1624 | unsigned pref) | |
1625 | { | |
86872cb5 TG |
1626 | struct fib6_config cfg = { |
1627 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1628 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1629 | .fc_ifindex = ifindex, |
1630 | .fc_dst_len = prefixlen, | |
1631 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1632 | RTF_UP | RTF_PREF(pref), | |
1633 | }; | |
1634 | ||
1635 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1636 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1637 | |
e317da96 YH |
1638 | /* We should treat it as a default route if prefix length is 0. */ |
1639 | if (!prefixlen) | |
86872cb5 | 1640 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1641 | |
86872cb5 | 1642 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1643 | |
1644 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1645 | } | |
1646 | #endif | |
1647 | ||
1da177e4 | 1648 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1649 | { |
1da177e4 | 1650 | struct rt6_info *rt; |
c71099ac | 1651 | struct fib6_table *table; |
1da177e4 | 1652 | |
58f09b78 | 1653 | table = fib6_get_table(&init_net, RT6_TABLE_DFLT); |
c71099ac TG |
1654 | if (table == NULL) |
1655 | return NULL; | |
1da177e4 | 1656 | |
c71099ac | 1657 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1658 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1659 | if (dev == rt->rt6i_dev && |
045927ff | 1660 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1661 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1662 | break; | |
1663 | } | |
1664 | if (rt) | |
1665 | dst_hold(&rt->u.dst); | |
c71099ac | 1666 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1667 | return rt; |
1668 | } | |
1669 | ||
c7dc89c0 FT |
1670 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1671 | ||
1da177e4 | 1672 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1673 | struct net_device *dev, |
1674 | unsigned int pref) | |
1da177e4 | 1675 | { |
86872cb5 TG |
1676 | struct fib6_config cfg = { |
1677 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1678 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1679 | .fc_ifindex = dev->ifindex, |
1680 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1681 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1682 | }; | |
1da177e4 | 1683 | |
86872cb5 | 1684 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1685 | |
86872cb5 | 1686 | ip6_route_add(&cfg); |
1da177e4 | 1687 | |
1da177e4 LT |
1688 | return rt6_get_dflt_router(gwaddr, dev); |
1689 | } | |
1690 | ||
1691 | void rt6_purge_dflt_routers(void) | |
1692 | { | |
1693 | struct rt6_info *rt; | |
c71099ac TG |
1694 | struct fib6_table *table; |
1695 | ||
1696 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
58f09b78 | 1697 | table = fib6_get_table(&init_net, RT6_TABLE_DFLT); |
c71099ac TG |
1698 | if (table == NULL) |
1699 | return; | |
1da177e4 LT |
1700 | |
1701 | restart: | |
c71099ac | 1702 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1703 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1704 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1705 | dst_hold(&rt->u.dst); | |
c71099ac | 1706 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1707 | ip6_del_rt(rt); |
1da177e4 LT |
1708 | goto restart; |
1709 | } | |
1710 | } | |
c71099ac | 1711 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1712 | } |
1713 | ||
86872cb5 TG |
1714 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1715 | struct fib6_config *cfg) | |
1716 | { | |
1717 | memset(cfg, 0, sizeof(*cfg)); | |
1718 | ||
1719 | cfg->fc_table = RT6_TABLE_MAIN; | |
1720 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1721 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1722 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1723 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1724 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1725 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1726 | ||
f1243c2d BT |
1727 | cfg->fc_nlinfo.nl_net = &init_net; |
1728 | ||
86872cb5 TG |
1729 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1730 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1731 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1732 | } | |
1733 | ||
1da177e4 LT |
1734 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1735 | { | |
86872cb5 | 1736 | struct fib6_config cfg; |
1da177e4 LT |
1737 | struct in6_rtmsg rtmsg; |
1738 | int err; | |
1739 | ||
1740 | switch(cmd) { | |
1741 | case SIOCADDRT: /* Add a route */ | |
1742 | case SIOCDELRT: /* Delete a route */ | |
1743 | if (!capable(CAP_NET_ADMIN)) | |
1744 | return -EPERM; | |
1745 | err = copy_from_user(&rtmsg, arg, | |
1746 | sizeof(struct in6_rtmsg)); | |
1747 | if (err) | |
1748 | return -EFAULT; | |
86872cb5 TG |
1749 | |
1750 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1751 | ||
1da177e4 LT |
1752 | rtnl_lock(); |
1753 | switch (cmd) { | |
1754 | case SIOCADDRT: | |
86872cb5 | 1755 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1756 | break; |
1757 | case SIOCDELRT: | |
86872cb5 | 1758 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1759 | break; |
1760 | default: | |
1761 | err = -EINVAL; | |
1762 | } | |
1763 | rtnl_unlock(); | |
1764 | ||
1765 | return err; | |
3ff50b79 | 1766 | } |
1da177e4 LT |
1767 | |
1768 | return -EINVAL; | |
1769 | } | |
1770 | ||
1771 | /* | |
1772 | * Drop the packet on the floor | |
1773 | */ | |
1774 | ||
50eb431d | 1775 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1776 | { |
612f09e8 YH |
1777 | int type; |
1778 | switch (ipstats_mib_noroutes) { | |
1779 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1780 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1781 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1782 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1783 | break; | |
1784 | } | |
1785 | /* FALLTHROUGH */ | |
1786 | case IPSTATS_MIB_OUTNOROUTES: | |
1787 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1788 | break; | |
1789 | } | |
9ce8ade0 | 1790 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1791 | kfree_skb(skb); |
1792 | return 0; | |
1793 | } | |
1794 | ||
9ce8ade0 TG |
1795 | static int ip6_pkt_discard(struct sk_buff *skb) |
1796 | { | |
612f09e8 | 1797 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1798 | } |
1799 | ||
20380731 | 1800 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1801 | { |
1802 | skb->dev = skb->dst->dev; | |
612f09e8 | 1803 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1804 | } |
1805 | ||
6723ab54 DM |
1806 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1807 | ||
9ce8ade0 TG |
1808 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1809 | { | |
612f09e8 | 1810 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1811 | } |
1812 | ||
1813 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1814 | { | |
1815 | skb->dev = skb->dst->dev; | |
612f09e8 | 1816 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1817 | } |
1818 | ||
6723ab54 DM |
1819 | #endif |
1820 | ||
1da177e4 LT |
1821 | /* |
1822 | * Allocate a dst for local (unicast / anycast) address. | |
1823 | */ | |
1824 | ||
1825 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1826 | const struct in6_addr *addr, | |
1827 | int anycast) | |
1828 | { | |
1829 | struct rt6_info *rt = ip6_dst_alloc(); | |
1830 | ||
1831 | if (rt == NULL) | |
1832 | return ERR_PTR(-ENOMEM); | |
1833 | ||
2774c7ab | 1834 | dev_hold(init_net.loopback_dev); |
1da177e4 LT |
1835 | in6_dev_hold(idev); |
1836 | ||
1837 | rt->u.dst.flags = DST_HOST; | |
1838 | rt->u.dst.input = ip6_input; | |
1839 | rt->u.dst.output = ip6_output; | |
2774c7ab | 1840 | rt->rt6i_dev = init_net.loopback_dev; |
1da177e4 LT |
1841 | rt->rt6i_idev = idev; |
1842 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1843 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1844 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1845 | rt->u.dst.obsolete = -1; | |
1846 | ||
1847 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1848 | if (anycast) |
1849 | rt->rt6i_flags |= RTF_ANYCAST; | |
1850 | else | |
1da177e4 LT |
1851 | rt->rt6i_flags |= RTF_LOCAL; |
1852 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1853 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1854 | dst_free(&rt->u.dst); |
1da177e4 LT |
1855 | return ERR_PTR(-ENOMEM); |
1856 | } | |
1857 | ||
1858 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1859 | rt->rt6i_dst.plen = 128; | |
58f09b78 | 1860 | rt->rt6i_table = fib6_get_table(&init_net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1861 | |
1862 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1863 | ||
1864 | return rt; | |
1865 | } | |
1866 | ||
1867 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1868 | { | |
1869 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1870 | rt != &ip6_null_entry) { | |
1871 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1872 | return -1; | |
1873 | } | |
1874 | return 0; | |
1875 | } | |
1876 | ||
f3db4851 | 1877 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1878 | { |
f3db4851 | 1879 | fib6_clean_all(net, fib6_ifdown, 0, dev); |
1da177e4 LT |
1880 | } |
1881 | ||
1882 | struct rt6_mtu_change_arg | |
1883 | { | |
1884 | struct net_device *dev; | |
1885 | unsigned mtu; | |
1886 | }; | |
1887 | ||
1888 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1889 | { | |
1890 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1891 | struct inet6_dev *idev; | |
1892 | ||
1893 | /* In IPv6 pmtu discovery is not optional, | |
1894 | so that RTAX_MTU lock cannot disable it. | |
1895 | We still use this lock to block changes | |
1896 | caused by addrconf/ndisc. | |
1897 | */ | |
1898 | ||
1899 | idev = __in6_dev_get(arg->dev); | |
1900 | if (idev == NULL) | |
1901 | return 0; | |
1902 | ||
1903 | /* For administrative MTU increase, there is no way to discover | |
1904 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1905 | Since RFC 1981 doesn't include administrative MTU increase | |
1906 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1907 | */ | |
1908 | /* | |
1909 | If new MTU is less than route PMTU, this new MTU will be the | |
1910 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1911 | decreases; if new MTU is greater than route PMTU, and the | |
1912 | old MTU is the lowest MTU in the path, update the route PMTU | |
1913 | to reflect the increase. In this case if the other nodes' MTU | |
1914 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1915 | PMTU discouvery. | |
1916 | */ | |
1917 | if (rt->rt6i_dev == arg->dev && | |
1918 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1919 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1920 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1921 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1922 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
566cfd8f SA |
1923 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
1924 | } | |
1da177e4 LT |
1925 | return 0; |
1926 | } | |
1927 | ||
1928 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1929 | { | |
c71099ac TG |
1930 | struct rt6_mtu_change_arg arg = { |
1931 | .dev = dev, | |
1932 | .mtu = mtu, | |
1933 | }; | |
1da177e4 | 1934 | |
f3db4851 | 1935 | fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1936 | } |
1937 | ||
ef7c79ed | 1938 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1939 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1940 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1941 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1942 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1943 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1944 | }; | |
1945 | ||
1946 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1947 | struct fib6_config *cfg) | |
1da177e4 | 1948 | { |
86872cb5 TG |
1949 | struct rtmsg *rtm; |
1950 | struct nlattr *tb[RTA_MAX+1]; | |
1951 | int err; | |
1da177e4 | 1952 | |
86872cb5 TG |
1953 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1954 | if (err < 0) | |
1955 | goto errout; | |
1da177e4 | 1956 | |
86872cb5 TG |
1957 | err = -EINVAL; |
1958 | rtm = nlmsg_data(nlh); | |
1959 | memset(cfg, 0, sizeof(*cfg)); | |
1960 | ||
1961 | cfg->fc_table = rtm->rtm_table; | |
1962 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1963 | cfg->fc_src_len = rtm->rtm_src_len; | |
1964 | cfg->fc_flags = RTF_UP; | |
1965 | cfg->fc_protocol = rtm->rtm_protocol; | |
1966 | ||
1967 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1968 | cfg->fc_flags |= RTF_REJECT; | |
1969 | ||
1970 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1971 | cfg->fc_nlinfo.nlh = nlh; | |
2216b483 | 1972 | cfg->fc_nlinfo.nl_net = skb->sk->sk_net; |
86872cb5 TG |
1973 | |
1974 | if (tb[RTA_GATEWAY]) { | |
1975 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1976 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1977 | } |
86872cb5 TG |
1978 | |
1979 | if (tb[RTA_DST]) { | |
1980 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1981 | ||
1982 | if (nla_len(tb[RTA_DST]) < plen) | |
1983 | goto errout; | |
1984 | ||
1985 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1986 | } |
86872cb5 TG |
1987 | |
1988 | if (tb[RTA_SRC]) { | |
1989 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1990 | ||
1991 | if (nla_len(tb[RTA_SRC]) < plen) | |
1992 | goto errout; | |
1993 | ||
1994 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1995 | } |
86872cb5 TG |
1996 | |
1997 | if (tb[RTA_OIF]) | |
1998 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1999 | ||
2000 | if (tb[RTA_PRIORITY]) | |
2001 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2002 | ||
2003 | if (tb[RTA_METRICS]) { | |
2004 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2005 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2006 | } |
86872cb5 TG |
2007 | |
2008 | if (tb[RTA_TABLE]) | |
2009 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2010 | ||
2011 | err = 0; | |
2012 | errout: | |
2013 | return err; | |
1da177e4 LT |
2014 | } |
2015 | ||
c127ea2c | 2016 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2017 | { |
b854272b | 2018 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2019 | struct fib6_config cfg; |
2020 | int err; | |
1da177e4 | 2021 | |
b854272b DL |
2022 | if (net != &init_net) |
2023 | return -EINVAL; | |
2024 | ||
86872cb5 TG |
2025 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2026 | if (err < 0) | |
2027 | return err; | |
2028 | ||
2029 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2030 | } |
2031 | ||
c127ea2c | 2032 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2033 | { |
b854272b | 2034 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2035 | struct fib6_config cfg; |
2036 | int err; | |
1da177e4 | 2037 | |
b854272b DL |
2038 | if (net != &init_net) |
2039 | return -EINVAL; | |
2040 | ||
86872cb5 TG |
2041 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2042 | if (err < 0) | |
2043 | return err; | |
2044 | ||
2045 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2046 | } |
2047 | ||
339bf98f TG |
2048 | static inline size_t rt6_nlmsg_size(void) |
2049 | { | |
2050 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2051 | + nla_total_size(16) /* RTA_SRC */ | |
2052 | + nla_total_size(16) /* RTA_DST */ | |
2053 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2054 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2055 | + nla_total_size(4) /* RTA_TABLE */ | |
2056 | + nla_total_size(4) /* RTA_IIF */ | |
2057 | + nla_total_size(4) /* RTA_OIF */ | |
2058 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2059 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2060 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2061 | } | |
2062 | ||
1da177e4 | 2063 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2064 | struct in6_addr *dst, struct in6_addr *src, |
2065 | int iif, int type, u32 pid, u32 seq, | |
2066 | int prefix, unsigned int flags) | |
1da177e4 LT |
2067 | { |
2068 | struct rtmsg *rtm; | |
2d7202bf | 2069 | struct nlmsghdr *nlh; |
e3703b3d | 2070 | long expires; |
9e762a4a | 2071 | u32 table; |
1da177e4 LT |
2072 | |
2073 | if (prefix) { /* user wants prefix routes only */ | |
2074 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2075 | /* success since this is not a prefix route */ | |
2076 | return 1; | |
2077 | } | |
2078 | } | |
2079 | ||
2d7202bf TG |
2080 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2081 | if (nlh == NULL) | |
26932566 | 2082 | return -EMSGSIZE; |
2d7202bf TG |
2083 | |
2084 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2085 | rtm->rtm_family = AF_INET6; |
2086 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2087 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2088 | rtm->rtm_tos = 0; | |
c71099ac | 2089 | if (rt->rt6i_table) |
9e762a4a | 2090 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2091 | else |
9e762a4a PM |
2092 | table = RT6_TABLE_UNSPEC; |
2093 | rtm->rtm_table = table; | |
2d7202bf | 2094 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2095 | if (rt->rt6i_flags&RTF_REJECT) |
2096 | rtm->rtm_type = RTN_UNREACHABLE; | |
2097 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2098 | rtm->rtm_type = RTN_LOCAL; | |
2099 | else | |
2100 | rtm->rtm_type = RTN_UNICAST; | |
2101 | rtm->rtm_flags = 0; | |
2102 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2103 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2104 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2105 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2106 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2107 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2108 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2109 | rtm->rtm_protocol = RTPROT_RA; | |
2110 | ||
2111 | if (rt->rt6i_flags&RTF_CACHE) | |
2112 | rtm->rtm_flags |= RTM_F_CLONED; | |
2113 | ||
2114 | if (dst) { | |
2d7202bf | 2115 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2116 | rtm->rtm_dst_len = 128; |
1da177e4 | 2117 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2118 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2119 | #ifdef CONFIG_IPV6_SUBTREES |
2120 | if (src) { | |
2d7202bf | 2121 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2122 | rtm->rtm_src_len = 128; |
1da177e4 | 2123 | } else if (rtm->rtm_src_len) |
2d7202bf | 2124 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2125 | #endif |
2126 | if (iif) | |
2d7202bf | 2127 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2128 | else if (dst) { |
2129 | struct in6_addr saddr_buf; | |
5e5f3f0f YH |
2130 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
2131 | dst, &saddr_buf) == 0) | |
2d7202bf | 2132 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2133 | } |
2d7202bf | 2134 | |
1da177e4 | 2135 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2136 | goto nla_put_failure; |
2137 | ||
1da177e4 | 2138 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2139 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2140 | ||
1da177e4 | 2141 | if (rt->u.dst.dev) |
2d7202bf TG |
2142 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2143 | ||
2144 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2145 | |
2146 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2147 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2148 | expires, rt->u.dst.error) < 0) | |
2149 | goto nla_put_failure; | |
2d7202bf TG |
2150 | |
2151 | return nlmsg_end(skb, nlh); | |
2152 | ||
2153 | nla_put_failure: | |
26932566 PM |
2154 | nlmsg_cancel(skb, nlh); |
2155 | return -EMSGSIZE; | |
1da177e4 LT |
2156 | } |
2157 | ||
1b43af54 | 2158 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2159 | { |
2160 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2161 | int prefix; | |
2162 | ||
2d7202bf TG |
2163 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2164 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2165 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2166 | } else | |
2167 | prefix = 0; | |
2168 | ||
2169 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2170 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2171 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2172 | } |
2173 | ||
c127ea2c | 2174 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2175 | { |
b854272b | 2176 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2177 | struct nlattr *tb[RTA_MAX+1]; |
2178 | struct rt6_info *rt; | |
1da177e4 | 2179 | struct sk_buff *skb; |
ab364a6f | 2180 | struct rtmsg *rtm; |
1da177e4 | 2181 | struct flowi fl; |
ab364a6f | 2182 | int err, iif = 0; |
1da177e4 | 2183 | |
b854272b DL |
2184 | if (net != &init_net) |
2185 | return -EINVAL; | |
2186 | ||
ab364a6f TG |
2187 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2188 | if (err < 0) | |
2189 | goto errout; | |
1da177e4 | 2190 | |
ab364a6f | 2191 | err = -EINVAL; |
1da177e4 | 2192 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2193 | |
ab364a6f TG |
2194 | if (tb[RTA_SRC]) { |
2195 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2196 | goto errout; | |
2197 | ||
2198 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2199 | } | |
2200 | ||
2201 | if (tb[RTA_DST]) { | |
2202 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2203 | goto errout; | |
2204 | ||
2205 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2206 | } | |
2207 | ||
2208 | if (tb[RTA_IIF]) | |
2209 | iif = nla_get_u32(tb[RTA_IIF]); | |
2210 | ||
2211 | if (tb[RTA_OIF]) | |
2212 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2213 | |
2214 | if (iif) { | |
2215 | struct net_device *dev; | |
881d966b | 2216 | dev = __dev_get_by_index(&init_net, iif); |
1da177e4 LT |
2217 | if (!dev) { |
2218 | err = -ENODEV; | |
ab364a6f | 2219 | goto errout; |
1da177e4 LT |
2220 | } |
2221 | } | |
2222 | ||
ab364a6f TG |
2223 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2224 | if (skb == NULL) { | |
2225 | err = -ENOBUFS; | |
2226 | goto errout; | |
2227 | } | |
1da177e4 | 2228 | |
ab364a6f TG |
2229 | /* Reserve room for dummy headers, this skb can pass |
2230 | through good chunk of routing engine. | |
2231 | */ | |
459a98ed | 2232 | skb_reset_mac_header(skb); |
ab364a6f | 2233 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2234 | |
ab364a6f | 2235 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2236 | skb->dst = &rt->u.dst; |
2237 | ||
ab364a6f | 2238 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2239 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2240 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2241 | if (err < 0) { |
ab364a6f TG |
2242 | kfree_skb(skb); |
2243 | goto errout; | |
1da177e4 LT |
2244 | } |
2245 | ||
97c53cac | 2246 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2247 | errout: |
1da177e4 | 2248 | return err; |
1da177e4 LT |
2249 | } |
2250 | ||
86872cb5 | 2251 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2252 | { |
2253 | struct sk_buff *skb; | |
528c4ceb DL |
2254 | u32 seq; |
2255 | int err; | |
2256 | ||
2257 | err = -ENOBUFS; | |
2258 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2259 | |
339bf98f | 2260 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2261 | if (skb == NULL) |
2262 | goto errout; | |
2263 | ||
528c4ceb DL |
2264 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2265 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2266 | if (err < 0) { |
2267 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2268 | WARN_ON(err == -EMSGSIZE); | |
2269 | kfree_skb(skb); | |
2270 | goto errout; | |
2271 | } | |
528c4ceb DL |
2272 | err = rtnl_notify(skb, &init_net, info->pid, |
2273 | RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any()); | |
21713ebc TG |
2274 | errout: |
2275 | if (err < 0) | |
97c53cac | 2276 | rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2277 | } |
2278 | ||
2279 | /* | |
2280 | * /proc | |
2281 | */ | |
2282 | ||
2283 | #ifdef CONFIG_PROC_FS | |
2284 | ||
2285 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2286 | ||
2287 | struct rt6_proc_arg | |
2288 | { | |
2289 | char *buffer; | |
2290 | int offset; | |
2291 | int length; | |
2292 | int skip; | |
2293 | int len; | |
2294 | }; | |
2295 | ||
2296 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2297 | { | |
33120b30 | 2298 | struct seq_file *m = p_arg; |
1da177e4 | 2299 | |
33120b30 AD |
2300 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2301 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2302 | |
2303 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2304 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2305 | rt->rt6i_src.plen); | |
1da177e4 | 2306 | #else |
33120b30 | 2307 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2308 | #endif |
2309 | ||
2310 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2311 | seq_printf(m, NIP6_SEQFMT, |
2312 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2313 | } else { |
33120b30 | 2314 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2315 | } |
33120b30 AD |
2316 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2317 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2318 | rt->u.dst.__use, rt->rt6i_flags, | |
2319 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2320 | return 0; |
2321 | } | |
2322 | ||
33120b30 | 2323 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2324 | { |
f3db4851 DL |
2325 | struct net *net = (struct net *)m->private; |
2326 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2327 | return 0; |
2328 | } | |
1da177e4 | 2329 | |
33120b30 AD |
2330 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2331 | { | |
f3db4851 DL |
2332 | struct net *net = get_proc_net(inode); |
2333 | if (!net) | |
2334 | return -ENXIO; | |
2335 | return single_open(file, ipv6_route_show, net); | |
2336 | } | |
2337 | ||
2338 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2339 | { | |
2340 | struct seq_file *seq = file->private_data; | |
2341 | struct net *net = seq->private; | |
2342 | put_net(net); | |
2343 | return single_release(inode, file); | |
1da177e4 LT |
2344 | } |
2345 | ||
33120b30 AD |
2346 | static const struct file_operations ipv6_route_proc_fops = { |
2347 | .owner = THIS_MODULE, | |
2348 | .open = ipv6_route_open, | |
2349 | .read = seq_read, | |
2350 | .llseek = seq_lseek, | |
f3db4851 | 2351 | .release = ipv6_route_release, |
33120b30 AD |
2352 | }; |
2353 | ||
1da177e4 LT |
2354 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2355 | { | |
69ddb805 | 2356 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2357 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2358 | net->ipv6.rt6_stats->fib_nodes, |
2359 | net->ipv6.rt6_stats->fib_route_nodes, | |
2360 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2361 | net->ipv6.rt6_stats->fib_rt_entries, | |
2362 | net->ipv6.rt6_stats->fib_rt_cache, | |
c572872f | 2363 | atomic_read(&ip6_dst_ops.entries), |
69ddb805 | 2364 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2365 | |
2366 | return 0; | |
2367 | } | |
2368 | ||
2369 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2370 | { | |
69ddb805 DL |
2371 | struct net *net = get_proc_net(inode); |
2372 | return single_open(file, rt6_stats_seq_show, net); | |
2373 | } | |
2374 | ||
2375 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2376 | { | |
2377 | struct seq_file *seq = file->private_data; | |
2378 | struct net *net = (struct net *)seq->private; | |
2379 | put_net(net); | |
2380 | return single_release(inode, file); | |
1da177e4 LT |
2381 | } |
2382 | ||
9a32144e | 2383 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2384 | .owner = THIS_MODULE, |
2385 | .open = rt6_stats_seq_open, | |
2386 | .read = seq_read, | |
2387 | .llseek = seq_lseek, | |
69ddb805 | 2388 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2389 | }; |
2390 | #endif /* CONFIG_PROC_FS */ | |
2391 | ||
2392 | #ifdef CONFIG_SYSCTL | |
2393 | ||
1da177e4 LT |
2394 | static |
2395 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2396 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2397 | { | |
5b7c931d DL |
2398 | struct net *net = current->nsproxy->net_ns; |
2399 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2400 | if (write) { |
2401 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2402 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2403 | return 0; |
2404 | } else | |
2405 | return -EINVAL; | |
2406 | } | |
2407 | ||
760f2d01 | 2408 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2409 | { |
1da177e4 | 2410 | .procname = "flush", |
4990509f | 2411 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2412 | .maxlen = sizeof(int), |
89c8b3a1 | 2413 | .mode = 0200, |
1ab1457c | 2414 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2415 | }, |
2416 | { | |
2417 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2418 | .procname = "gc_thresh", | |
1ab1457c | 2419 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2420 | .maxlen = sizeof(int), |
2421 | .mode = 0644, | |
1ab1457c | 2422 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2423 | }, |
2424 | { | |
2425 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2426 | .procname = "max_size", | |
4990509f | 2427 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2428 | .maxlen = sizeof(int), |
2429 | .mode = 0644, | |
1ab1457c | 2430 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2431 | }, |
2432 | { | |
2433 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2434 | .procname = "gc_min_interval", | |
4990509f | 2435 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2436 | .maxlen = sizeof(int), |
2437 | .mode = 0644, | |
1ab1457c | 2438 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2439 | .strategy = &sysctl_jiffies, |
2440 | }, | |
2441 | { | |
2442 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2443 | .procname = "gc_timeout", | |
4990509f | 2444 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
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_INTERVAL, | |
2452 | .procname = "gc_interval", | |
4990509f | 2453 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
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_ELASTICITY, | |
2461 | .procname = "gc_elasticity", | |
4990509f | 2462 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
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_MTU_EXPIRES, | |
2470 | .procname = "mtu_expires", | |
4990509f | 2471 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
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_MIN_ADVMSS, | |
2479 | .procname = "min_adv_mss", | |
4990509f | 2480 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
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_GC_MIN_INTERVAL_MS, | |
2488 | .procname = "gc_min_interval_ms", | |
4990509f | 2489 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2490 | .maxlen = sizeof(int), |
2491 | .mode = 0644, | |
1ab1457c | 2492 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2493 | .strategy = &sysctl_ms_jiffies, |
2494 | }, | |
2495 | { .ctl_name = 0 } | |
2496 | }; | |
2497 | ||
760f2d01 DL |
2498 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2499 | { | |
2500 | struct ctl_table *table; | |
2501 | ||
2502 | table = kmemdup(ipv6_route_table_template, | |
2503 | sizeof(ipv6_route_table_template), | |
2504 | GFP_KERNEL); | |
5ee09105 YH |
2505 | |
2506 | if (table) { | |
2507 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
2508 | /* table[1].data will be handled when we have | |
2509 | routes per namespace */ | |
2510 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; | |
2511 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2512 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2513 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2514 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2515 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2516 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2517 | } | |
2518 | ||
760f2d01 DL |
2519 | return table; |
2520 | } | |
1da177e4 LT |
2521 | #endif |
2522 | ||
cdb18761 DL |
2523 | static int ip6_route_net_init(struct net *net) |
2524 | { | |
2525 | #ifdef CONFIG_PROC_FS | |
2526 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2527 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2528 | #endif | |
2529 | return 0; | |
2530 | } | |
2531 | ||
2532 | static void ip6_route_net_exit(struct net *net) | |
2533 | { | |
2534 | #ifdef CONFIG_PROC_FS | |
2535 | proc_net_remove(net, "ipv6_route"); | |
2536 | proc_net_remove(net, "rt6_stats"); | |
2537 | #endif | |
2538 | } | |
2539 | ||
2540 | static struct pernet_operations ip6_route_net_ops = { | |
2541 | .init = ip6_route_net_init, | |
2542 | .exit = ip6_route_net_exit, | |
2543 | }; | |
2544 | ||
433d49c3 | 2545 | int __init ip6_route_init(void) |
1da177e4 | 2546 | { |
433d49c3 DL |
2547 | int ret; |
2548 | ||
e5d679f3 AD |
2549 | ip6_dst_ops.kmem_cachep = |
2550 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
f845ab6b DL |
2551 | SLAB_HWCACHE_ALIGN, NULL); |
2552 | if (!ip6_dst_ops.kmem_cachep) | |
2553 | return -ENOMEM; | |
2554 | ||
14e50e57 DM |
2555 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2556 | ||
433d49c3 DL |
2557 | ret = fib6_init(); |
2558 | if (ret) | |
2559 | goto out_kmem_cache; | |
2560 | ||
433d49c3 DL |
2561 | ret = xfrm6_init(); |
2562 | if (ret) | |
cdb18761 | 2563 | goto out_fib6_init; |
c35b7e72 | 2564 | |
433d49c3 DL |
2565 | ret = fib6_rules_init(); |
2566 | if (ret) | |
2567 | goto xfrm6_init; | |
7e5449c2 | 2568 | |
433d49c3 DL |
2569 | ret = -ENOBUFS; |
2570 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2571 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2572 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2573 | goto fib6_rules_init; | |
c127ea2c | 2574 | |
cdb18761 DL |
2575 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2576 | if (ret) | |
2577 | goto fib6_rules_init; | |
433d49c3 DL |
2578 | out: |
2579 | return ret; | |
2580 | ||
2581 | fib6_rules_init: | |
433d49c3 DL |
2582 | fib6_rules_cleanup(); |
2583 | xfrm6_init: | |
433d49c3 | 2584 | xfrm6_fini(); |
433d49c3 | 2585 | out_fib6_init: |
f3db4851 | 2586 | rt6_ifdown(&init_net, NULL); |
433d49c3 DL |
2587 | fib6_gc_cleanup(); |
2588 | out_kmem_cache: | |
2589 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2590 | goto out; | |
1da177e4 LT |
2591 | } |
2592 | ||
2593 | void ip6_route_cleanup(void) | |
2594 | { | |
cdb18761 | 2595 | unregister_pernet_subsys(&ip6_route_net_ops); |
101367c2 | 2596 | fib6_rules_cleanup(); |
1da177e4 | 2597 | xfrm6_fini(); |
f3db4851 | 2598 | rt6_ifdown(&init_net, NULL); |
1da177e4 LT |
2599 | fib6_gc_cleanup(); |
2600 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2601 | } |