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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> | |
457c4cbc | 43 | #include <net/net_namespace.h> |
1da177e4 LT |
44 | #include <net/snmp.h> |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_fib.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/tcp.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/xfrm.h> | |
8d71740c | 54 | #include <net/netevent.h> |
21713ebc | 55 | #include <net/netlink.h> |
1da177e4 LT |
56 | |
57 | #include <asm/uaccess.h> | |
58 | ||
59 | #ifdef CONFIG_SYSCTL | |
60 | #include <linux/sysctl.h> | |
61 | #endif | |
62 | ||
63 | /* Set to 3 to get tracing. */ | |
64 | #define RT6_DEBUG 2 | |
65 | ||
66 | #if RT6_DEBUG >= 3 | |
67 | #define RDBG(x) printk x | |
68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
69 | #else | |
70 | #define RDBG(x) | |
71 | #define RT6_TRACE(x...) do { ; } while (0) | |
72 | #endif | |
73 | ||
519fbd87 | 74 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 75 | |
1da177e4 LT |
76 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
78 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
79 | static void ip6_dst_destroy(struct dst_entry *); | |
80 | static void ip6_dst_ifdown(struct dst_entry *, | |
81 | struct net_device *dev, int how); | |
569d3645 | 82 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
83 | |
84 | static int ip6_pkt_discard(struct sk_buff *skb); | |
85 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
86 | static void ip6_link_failure(struct sk_buff *skb); | |
87 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
88 | ||
70ceb4f5 YH |
89 | #ifdef CONFIG_IPV6_ROUTE_INFO |
90 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
91 | struct in6_addr *gwaddr, int ifindex, | |
92 | unsigned pref); | |
93 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
94 | struct in6_addr *gwaddr, int ifindex); | |
95 | #endif | |
96 | ||
1da177e4 LT |
97 | static struct dst_ops ip6_dst_ops = { |
98 | .family = AF_INET6, | |
99 | .protocol = __constant_htons(ETH_P_IPV6), | |
100 | .gc = ip6_dst_gc, | |
101 | .gc_thresh = 1024, | |
102 | .check = ip6_dst_check, | |
103 | .destroy = ip6_dst_destroy, | |
104 | .ifdown = ip6_dst_ifdown, | |
105 | .negative_advice = ip6_negative_advice, | |
106 | .link_failure = ip6_link_failure, | |
107 | .update_pmtu = ip6_rt_update_pmtu, | |
862b82c6 | 108 | .local_out = ip6_local_out, |
1da177e4 | 109 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 110 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
111 | }; |
112 | ||
14e50e57 DM |
113 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
114 | { | |
115 | } | |
116 | ||
117 | static struct dst_ops ip6_dst_blackhole_ops = { | |
118 | .family = AF_INET6, | |
119 | .protocol = __constant_htons(ETH_P_IPV6), | |
120 | .destroy = ip6_dst_destroy, | |
121 | .check = ip6_dst_check, | |
122 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
123 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 124 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
125 | }; |
126 | ||
1da177e4 LT |
127 | struct rt6_info ip6_null_entry = { |
128 | .u = { | |
129 | .dst = { | |
130 | .__refcnt = ATOMIC_INIT(1), | |
131 | .__use = 1, | |
1da177e4 LT |
132 | .obsolete = -1, |
133 | .error = -ENETUNREACH, | |
134 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
135 | .input = ip6_pkt_discard, | |
136 | .output = ip6_pkt_discard_out, | |
137 | .ops = &ip6_dst_ops, | |
138 | .path = (struct dst_entry*)&ip6_null_entry, | |
139 | } | |
140 | }, | |
141 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
142 | .rt6i_metric = ~(u32) 0, | |
143 | .rt6i_ref = ATOMIC_INIT(1), | |
144 | }; | |
145 | ||
101367c2 TG |
146 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
147 | ||
6723ab54 DM |
148 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
149 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 150 | |
101367c2 TG |
151 | struct rt6_info ip6_prohibit_entry = { |
152 | .u = { | |
153 | .dst = { | |
154 | .__refcnt = ATOMIC_INIT(1), | |
155 | .__use = 1, | |
101367c2 TG |
156 | .obsolete = -1, |
157 | .error = -EACCES, | |
158 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
159 | .input = ip6_pkt_prohibit, |
160 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
161 | .ops = &ip6_dst_ops, |
162 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
163 | } | |
164 | }, | |
165 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
166 | .rt6i_metric = ~(u32) 0, | |
167 | .rt6i_ref = ATOMIC_INIT(1), | |
168 | }; | |
169 | ||
170 | struct rt6_info ip6_blk_hole_entry = { | |
171 | .u = { | |
172 | .dst = { | |
173 | .__refcnt = ATOMIC_INIT(1), | |
174 | .__use = 1, | |
101367c2 TG |
175 | .obsolete = -1, |
176 | .error = -EINVAL, | |
177 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
178 | .input = dst_discard, |
179 | .output = dst_discard, | |
101367c2 TG |
180 | .ops = &ip6_dst_ops, |
181 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
182 | } | |
183 | }, | |
184 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
185 | .rt6i_metric = ~(u32) 0, | |
186 | .rt6i_ref = ATOMIC_INIT(1), | |
187 | }; | |
188 | ||
189 | #endif | |
190 | ||
1da177e4 LT |
191 | /* allocate dst with ip6_dst_ops */ |
192 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
193 | { | |
194 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
195 | } | |
196 | ||
197 | static void ip6_dst_destroy(struct dst_entry *dst) | |
198 | { | |
199 | struct rt6_info *rt = (struct rt6_info *)dst; | |
200 | struct inet6_dev *idev = rt->rt6i_idev; | |
201 | ||
202 | if (idev != NULL) { | |
203 | rt->rt6i_idev = NULL; | |
204 | in6_dev_put(idev); | |
1ab1457c | 205 | } |
1da177e4 LT |
206 | } |
207 | ||
208 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
209 | int how) | |
210 | { | |
211 | struct rt6_info *rt = (struct rt6_info *)dst; | |
212 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
213 | struct net_device *loopback_dev = |
214 | dev->nd_net->loopback_dev; | |
1da177e4 | 215 | |
5a3e55d6 DL |
216 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
217 | struct inet6_dev *loopback_idev = | |
218 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
219 | if (loopback_idev != NULL) { |
220 | rt->rt6i_idev = loopback_idev; | |
221 | in6_dev_put(idev); | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
226 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
227 | { | |
228 | return (rt->rt6i_flags & RTF_EXPIRES && | |
229 | time_after(jiffies, rt->rt6i_expires)); | |
230 | } | |
231 | ||
c71099ac TG |
232 | static inline int rt6_need_strict(struct in6_addr *daddr) |
233 | { | |
234 | return (ipv6_addr_type(daddr) & | |
235 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
236 | } | |
237 | ||
1da177e4 | 238 | /* |
c71099ac | 239 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
240 | */ |
241 | ||
242 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
243 | int oif, | |
244 | int strict) | |
245 | { | |
246 | struct rt6_info *local = NULL; | |
247 | struct rt6_info *sprt; | |
248 | ||
249 | if (oif) { | |
7cc48263 | 250 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
251 | struct net_device *dev = sprt->rt6i_dev; |
252 | if (dev->ifindex == oif) | |
253 | return sprt; | |
254 | if (dev->flags & IFF_LOOPBACK) { | |
255 | if (sprt->rt6i_idev == NULL || | |
256 | sprt->rt6i_idev->dev->ifindex != oif) { | |
257 | if (strict && oif) | |
258 | continue; | |
1ab1457c | 259 | if (local && (!oif || |
1da177e4 LT |
260 | local->rt6i_idev->dev->ifindex == oif)) |
261 | continue; | |
262 | } | |
263 | local = sprt; | |
264 | } | |
265 | } | |
266 | ||
267 | if (local) | |
268 | return local; | |
269 | ||
270 | if (strict) | |
271 | return &ip6_null_entry; | |
272 | } | |
273 | return rt; | |
274 | } | |
275 | ||
27097255 YH |
276 | #ifdef CONFIG_IPV6_ROUTER_PREF |
277 | static void rt6_probe(struct rt6_info *rt) | |
278 | { | |
279 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
280 | /* | |
281 | * Okay, this does not seem to be appropriate | |
282 | * for now, however, we need to check if it | |
283 | * is really so; aka Router Reachability Probing. | |
284 | * | |
285 | * Router Reachability Probe MUST be rate-limited | |
286 | * to no more than one per minute. | |
287 | */ | |
288 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
289 | return; | |
290 | read_lock_bh(&neigh->lock); | |
291 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 292 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
293 | struct in6_addr mcaddr; |
294 | struct in6_addr *target; | |
295 | ||
296 | neigh->updated = jiffies; | |
297 | read_unlock_bh(&neigh->lock); | |
298 | ||
299 | target = (struct in6_addr *)&neigh->primary_key; | |
300 | addrconf_addr_solict_mult(target, &mcaddr); | |
301 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
302 | } else | |
303 | read_unlock_bh(&neigh->lock); | |
304 | } | |
305 | #else | |
306 | static inline void rt6_probe(struct rt6_info *rt) | |
307 | { | |
308 | return; | |
309 | } | |
310 | #endif | |
311 | ||
1da177e4 | 312 | /* |
554cfb7e | 313 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 314 | */ |
b6f99a21 | 315 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
316 | { |
317 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 318 | if (!oif || dev->ifindex == oif) |
554cfb7e | 319 | return 2; |
161980f4 DM |
320 | if ((dev->flags & IFF_LOOPBACK) && |
321 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
322 | return 1; | |
323 | return 0; | |
554cfb7e | 324 | } |
1da177e4 | 325 | |
b6f99a21 | 326 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 327 | { |
554cfb7e | 328 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 329 | int m; |
4d0c5911 YH |
330 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
331 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
332 | m = 1; | |
333 | else if (neigh) { | |
554cfb7e YH |
334 | read_lock_bh(&neigh->lock); |
335 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 336 | m = 2; |
398bcbeb YH |
337 | #ifdef CONFIG_IPV6_ROUTER_PREF |
338 | else if (neigh->nud_state & NUD_FAILED) | |
339 | m = 0; | |
340 | #endif | |
341 | else | |
ea73ee23 | 342 | m = 1; |
554cfb7e | 343 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
344 | } else |
345 | m = 0; | |
554cfb7e | 346 | return m; |
1da177e4 LT |
347 | } |
348 | ||
554cfb7e YH |
349 | static int rt6_score_route(struct rt6_info *rt, int oif, |
350 | int strict) | |
1da177e4 | 351 | { |
4d0c5911 | 352 | int m, n; |
1ab1457c | 353 | |
4d0c5911 | 354 | m = rt6_check_dev(rt, oif); |
77d16f45 | 355 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 356 | return -1; |
ebacaaa0 YH |
357 | #ifdef CONFIG_IPV6_ROUTER_PREF |
358 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
359 | #endif | |
4d0c5911 | 360 | n = rt6_check_neigh(rt); |
557e92ef | 361 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
362 | return -1; |
363 | return m; | |
364 | } | |
365 | ||
f11e6659 DM |
366 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
367 | int *mpri, struct rt6_info *match) | |
554cfb7e | 368 | { |
f11e6659 DM |
369 | int m; |
370 | ||
371 | if (rt6_check_expired(rt)) | |
372 | goto out; | |
373 | ||
374 | m = rt6_score_route(rt, oif, strict); | |
375 | if (m < 0) | |
376 | goto out; | |
377 | ||
378 | if (m > *mpri) { | |
379 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
380 | rt6_probe(match); | |
381 | *mpri = m; | |
382 | match = rt; | |
383 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
384 | rt6_probe(rt); | |
385 | } | |
386 | ||
387 | out: | |
388 | return match; | |
389 | } | |
390 | ||
391 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
392 | struct rt6_info *rr_head, | |
393 | u32 metric, int oif, int strict) | |
394 | { | |
395 | struct rt6_info *rt, *match; | |
554cfb7e | 396 | int mpri = -1; |
1da177e4 | 397 | |
f11e6659 DM |
398 | match = NULL; |
399 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
400 | rt = rt->u.dst.rt6_next) | |
401 | match = find_match(rt, oif, strict, &mpri, match); | |
402 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
403 | rt = rt->u.dst.rt6_next) | |
404 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 405 | |
f11e6659 DM |
406 | return match; |
407 | } | |
1da177e4 | 408 | |
f11e6659 DM |
409 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
410 | { | |
411 | struct rt6_info *match, *rt0; | |
1da177e4 | 412 | |
f11e6659 DM |
413 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
414 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 415 | |
f11e6659 DM |
416 | rt0 = fn->rr_ptr; |
417 | if (!rt0) | |
418 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 419 | |
f11e6659 | 420 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 421 | |
554cfb7e | 422 | if (!match && |
f11e6659 DM |
423 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
424 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
425 | ||
554cfb7e | 426 | /* no entries matched; do round-robin */ |
f11e6659 DM |
427 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
428 | next = fn->leaf; | |
429 | ||
430 | if (next != rt0) | |
431 | fn->rr_ptr = next; | |
1da177e4 | 432 | } |
1da177e4 | 433 | |
f11e6659 DM |
434 | RT6_TRACE("%s() => %p\n", |
435 | __FUNCTION__, match); | |
1da177e4 | 436 | |
554cfb7e | 437 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
438 | } |
439 | ||
70ceb4f5 YH |
440 | #ifdef CONFIG_IPV6_ROUTE_INFO |
441 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
442 | struct in6_addr *gwaddr) | |
443 | { | |
444 | struct route_info *rinfo = (struct route_info *) opt; | |
445 | struct in6_addr prefix_buf, *prefix; | |
446 | unsigned int pref; | |
447 | u32 lifetime; | |
448 | struct rt6_info *rt; | |
449 | ||
450 | if (len < sizeof(struct route_info)) { | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
454 | /* Sanity check for prefix_len and length */ | |
455 | if (rinfo->length > 3) { | |
456 | return -EINVAL; | |
457 | } else if (rinfo->prefix_len > 128) { | |
458 | return -EINVAL; | |
459 | } else if (rinfo->prefix_len > 64) { | |
460 | if (rinfo->length < 2) { | |
461 | return -EINVAL; | |
462 | } | |
463 | } else if (rinfo->prefix_len > 0) { | |
464 | if (rinfo->length < 1) { | |
465 | return -EINVAL; | |
466 | } | |
467 | } | |
468 | ||
469 | pref = rinfo->route_pref; | |
470 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
471 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
472 | ||
e69a4adc | 473 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
474 | if (lifetime == 0xffffffff) { |
475 | /* infinity */ | |
476 | } else if (lifetime > 0x7fffffff/HZ) { | |
477 | /* Avoid arithmetic overflow */ | |
478 | lifetime = 0x7fffffff/HZ - 1; | |
479 | } | |
480 | ||
481 | if (rinfo->length == 3) | |
482 | prefix = (struct in6_addr *)rinfo->prefix; | |
483 | else { | |
484 | /* this function is safe */ | |
485 | ipv6_addr_prefix(&prefix_buf, | |
486 | (struct in6_addr *)rinfo->prefix, | |
487 | rinfo->prefix_len); | |
488 | prefix = &prefix_buf; | |
489 | } | |
490 | ||
491 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
492 | ||
493 | if (rt && !lifetime) { | |
e0a1ad73 | 494 | ip6_del_rt(rt); |
70ceb4f5 YH |
495 | rt = NULL; |
496 | } | |
497 | ||
498 | if (!rt && lifetime) | |
499 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
500 | pref); | |
501 | else if (rt) | |
502 | rt->rt6i_flags = RTF_ROUTEINFO | | |
503 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
504 | ||
505 | if (rt) { | |
506 | if (lifetime == 0xffffffff) { | |
507 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
508 | } else { | |
509 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
510 | rt->rt6i_flags |= RTF_EXPIRES; | |
511 | } | |
512 | dst_release(&rt->u.dst); | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | #endif | |
517 | ||
982f56f3 YH |
518 | #define BACKTRACK(saddr) \ |
519 | do { \ | |
520 | if (rt == &ip6_null_entry) { \ | |
521 | struct fib6_node *pn; \ | |
e0eda7bb | 522 | while (1) { \ |
982f56f3 YH |
523 | if (fn->fn_flags & RTN_TL_ROOT) \ |
524 | goto out; \ | |
525 | pn = fn->parent; \ | |
526 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 527 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
528 | else \ |
529 | fn = pn; \ | |
530 | if (fn->fn_flags & RTN_RTINFO) \ | |
531 | goto restart; \ | |
c71099ac | 532 | } \ |
c71099ac | 533 | } \ |
982f56f3 | 534 | } while(0) |
c71099ac TG |
535 | |
536 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
537 | struct flowi *fl, int flags) | |
1da177e4 LT |
538 | { |
539 | struct fib6_node *fn; | |
540 | struct rt6_info *rt; | |
541 | ||
c71099ac TG |
542 | read_lock_bh(&table->tb6_lock); |
543 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
544 | restart: | |
545 | rt = fn->leaf; | |
77d16f45 | 546 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 547 | BACKTRACK(&fl->fl6_src); |
c71099ac | 548 | out: |
03f49f34 | 549 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 550 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
551 | return rt; |
552 | ||
553 | } | |
554 | ||
555 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
556 | int oif, int strict) | |
557 | { | |
558 | struct flowi fl = { | |
559 | .oif = oif, | |
560 | .nl_u = { | |
561 | .ip6_u = { | |
562 | .daddr = *daddr, | |
c71099ac TG |
563 | }, |
564 | }, | |
565 | }; | |
566 | struct dst_entry *dst; | |
77d16f45 | 567 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 568 | |
adaa70bb TG |
569 | if (saddr) { |
570 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
571 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
572 | } | |
573 | ||
c71099ac TG |
574 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
575 | if (dst->error == 0) | |
576 | return (struct rt6_info *) dst; | |
577 | ||
578 | dst_release(dst); | |
579 | ||
1da177e4 LT |
580 | return NULL; |
581 | } | |
582 | ||
7159039a YH |
583 | EXPORT_SYMBOL(rt6_lookup); |
584 | ||
c71099ac | 585 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
586 | It takes new route entry, the addition fails by any reason the |
587 | route is freed. In any case, if caller does not hold it, it may | |
588 | be destroyed. | |
589 | */ | |
590 | ||
86872cb5 | 591 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
592 | { |
593 | int err; | |
c71099ac | 594 | struct fib6_table *table; |
1da177e4 | 595 | |
c71099ac TG |
596 | table = rt->rt6i_table; |
597 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 598 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 599 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
600 | |
601 | return err; | |
602 | } | |
603 | ||
40e22e8f TG |
604 | int ip6_ins_rt(struct rt6_info *rt) |
605 | { | |
4d1169c1 DL |
606 | struct nl_info info = { |
607 | .nl_net = &init_net, | |
608 | }; | |
528c4ceb | 609 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
610 | } |
611 | ||
95a9a5ba YH |
612 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
613 | struct in6_addr *saddr) | |
1da177e4 | 614 | { |
1da177e4 LT |
615 | struct rt6_info *rt; |
616 | ||
617 | /* | |
618 | * Clone the route. | |
619 | */ | |
620 | ||
621 | rt = ip6_rt_copy(ort); | |
622 | ||
623 | if (rt) { | |
58c4fb86 YH |
624 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
625 | if (rt->rt6i_dst.plen != 128 && | |
626 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
627 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 628 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 629 | } |
1da177e4 | 630 | |
58c4fb86 | 631 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
632 | rt->rt6i_dst.plen = 128; |
633 | rt->rt6i_flags |= RTF_CACHE; | |
634 | rt->u.dst.flags |= DST_HOST; | |
635 | ||
636 | #ifdef CONFIG_IPV6_SUBTREES | |
637 | if (rt->rt6i_src.plen && saddr) { | |
638 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
639 | rt->rt6i_src.plen = 128; | |
640 | } | |
641 | #endif | |
642 | ||
643 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
644 | ||
95a9a5ba | 645 | } |
1da177e4 | 646 | |
95a9a5ba YH |
647 | return rt; |
648 | } | |
1da177e4 | 649 | |
299d9939 YH |
650 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
651 | { | |
652 | struct rt6_info *rt = ip6_rt_copy(ort); | |
653 | if (rt) { | |
654 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
655 | rt->rt6i_dst.plen = 128; | |
656 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
657 | rt->u.dst.flags |= DST_HOST; |
658 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
659 | } | |
660 | return rt; | |
661 | } | |
662 | ||
4acad72d | 663 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, |
8ce11e6a | 664 | struct flowi *fl, int flags) |
1da177e4 LT |
665 | { |
666 | struct fib6_node *fn; | |
519fbd87 | 667 | struct rt6_info *rt, *nrt; |
c71099ac | 668 | int strict = 0; |
1da177e4 | 669 | int attempts = 3; |
519fbd87 | 670 | int err; |
ea659e07 | 671 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 672 | |
77d16f45 | 673 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
674 | |
675 | relookup: | |
c71099ac | 676 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 677 | |
8238dd06 | 678 | restart_2: |
c71099ac | 679 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
680 | |
681 | restart: | |
4acad72d | 682 | rt = rt6_select(fn, oif, strict | reachable); |
982f56f3 | 683 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
684 | if (rt == &ip6_null_entry || |
685 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 686 | goto out; |
1da177e4 | 687 | |
fb9de91e | 688 | dst_hold(&rt->u.dst); |
c71099ac | 689 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 690 | |
519fbd87 | 691 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 692 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
693 | else { |
694 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 695 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
696 | #else |
697 | goto out2; | |
698 | #endif | |
699 | } | |
e40cf353 | 700 | |
519fbd87 YH |
701 | dst_release(&rt->u.dst); |
702 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 703 | |
519fbd87 YH |
704 | dst_hold(&rt->u.dst); |
705 | if (nrt) { | |
40e22e8f | 706 | err = ip6_ins_rt(nrt); |
519fbd87 | 707 | if (!err) |
1da177e4 | 708 | goto out2; |
1da177e4 | 709 | } |
1da177e4 | 710 | |
519fbd87 YH |
711 | if (--attempts <= 0) |
712 | goto out2; | |
713 | ||
714 | /* | |
c71099ac | 715 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
716 | * released someone could insert this route. Relookup. |
717 | */ | |
718 | dst_release(&rt->u.dst); | |
719 | goto relookup; | |
720 | ||
721 | out: | |
8238dd06 YH |
722 | if (reachable) { |
723 | reachable = 0; | |
724 | goto restart_2; | |
725 | } | |
519fbd87 | 726 | dst_hold(&rt->u.dst); |
c71099ac | 727 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
728 | out2: |
729 | rt->u.dst.lastuse = jiffies; | |
730 | rt->u.dst.__use++; | |
c71099ac TG |
731 | |
732 | return rt; | |
1da177e4 LT |
733 | } |
734 | ||
4acad72d PE |
735 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
736 | struct flowi *fl, int flags) | |
737 | { | |
738 | return ip6_pol_route(table, fl->iif, fl, flags); | |
739 | } | |
740 | ||
c71099ac TG |
741 | void ip6_route_input(struct sk_buff *skb) |
742 | { | |
0660e03f | 743 | struct ipv6hdr *iph = ipv6_hdr(skb); |
adaa70bb | 744 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
745 | struct flowi fl = { |
746 | .iif = skb->dev->ifindex, | |
747 | .nl_u = { | |
748 | .ip6_u = { | |
749 | .daddr = iph->daddr, | |
750 | .saddr = iph->saddr, | |
90bcaf7b | 751 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
752 | }, |
753 | }, | |
1ab1457c | 754 | .mark = skb->mark, |
c71099ac TG |
755 | .proto = iph->nexthdr, |
756 | }; | |
adaa70bb TG |
757 | |
758 | if (rt6_need_strict(&iph->daddr)) | |
759 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
760 | |
761 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
762 | } | |
763 | ||
764 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
765 | struct flowi *fl, int flags) | |
1da177e4 | 766 | { |
4acad72d | 767 | return ip6_pol_route(table, fl->oif, fl, flags); |
c71099ac TG |
768 | } |
769 | ||
770 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
771 | { | |
772 | int flags = 0; | |
773 | ||
774 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 775 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 776 | |
adaa70bb TG |
777 | if (!ipv6_addr_any(&fl->fl6_src)) |
778 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
779 | ||
c71099ac | 780 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
781 | } |
782 | ||
7159039a | 783 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 784 | |
14e50e57 DM |
785 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
786 | { | |
787 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
788 | struct rt6_info *rt = (struct rt6_info *) | |
789 | dst_alloc(&ip6_dst_blackhole_ops); | |
790 | struct dst_entry *new = NULL; | |
791 | ||
792 | if (rt) { | |
793 | new = &rt->u.dst; | |
794 | ||
795 | atomic_set(&new->__refcnt, 1); | |
796 | new->__use = 1; | |
352e512c HX |
797 | new->input = dst_discard; |
798 | new->output = dst_discard; | |
14e50e57 DM |
799 | |
800 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
801 | new->dev = ort->u.dst.dev; | |
802 | if (new->dev) | |
803 | dev_hold(new->dev); | |
804 | rt->rt6i_idev = ort->rt6i_idev; | |
805 | if (rt->rt6i_idev) | |
806 | in6_dev_hold(rt->rt6i_idev); | |
807 | rt->rt6i_expires = 0; | |
808 | ||
809 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
810 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
811 | rt->rt6i_metric = 0; | |
812 | ||
813 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
814 | #ifdef CONFIG_IPV6_SUBTREES | |
815 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
816 | #endif | |
817 | ||
818 | dst_free(new); | |
819 | } | |
820 | ||
821 | dst_release(*dstp); | |
822 | *dstp = new; | |
823 | return (new ? 0 : -ENOMEM); | |
824 | } | |
825 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
826 | ||
1da177e4 LT |
827 | /* |
828 | * Destination cache support functions | |
829 | */ | |
830 | ||
831 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
832 | { | |
833 | struct rt6_info *rt; | |
834 | ||
835 | rt = (struct rt6_info *) dst; | |
836 | ||
837 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
838 | return dst; | |
839 | ||
840 | return NULL; | |
841 | } | |
842 | ||
843 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
844 | { | |
845 | struct rt6_info *rt = (struct rt6_info *) dst; | |
846 | ||
847 | if (rt) { | |
848 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 849 | ip6_del_rt(rt); |
1da177e4 LT |
850 | else |
851 | dst_release(dst); | |
852 | } | |
853 | return NULL; | |
854 | } | |
855 | ||
856 | static void ip6_link_failure(struct sk_buff *skb) | |
857 | { | |
858 | struct rt6_info *rt; | |
859 | ||
860 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
861 | ||
862 | rt = (struct rt6_info *) skb->dst; | |
863 | if (rt) { | |
864 | if (rt->rt6i_flags&RTF_CACHE) { | |
865 | dst_set_expires(&rt->u.dst, 0); | |
866 | rt->rt6i_flags |= RTF_EXPIRES; | |
867 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
868 | rt->rt6i_node->fn_sernum = -1; | |
869 | } | |
870 | } | |
871 | ||
872 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
873 | { | |
874 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
875 | ||
876 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
877 | rt6->rt6i_flags |= RTF_MODIFIED; | |
878 | if (mtu < IPV6_MIN_MTU) { | |
879 | mtu = IPV6_MIN_MTU; | |
880 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
881 | } | |
882 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 883 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
884 | } |
885 | } | |
886 | ||
1da177e4 LT |
887 | static int ipv6_get_mtu(struct net_device *dev); |
888 | ||
889 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
890 | { | |
891 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
892 | ||
4990509f DL |
893 | if (mtu < init_net.ipv6.sysctl.ip6_rt_min_advmss) |
894 | mtu = init_net.ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
895 | |
896 | /* | |
1ab1457c YH |
897 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
898 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
899 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
900 | * rely only on pmtu discovery" |
901 | */ | |
902 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
903 | mtu = IPV6_MAXPLEN; | |
904 | return mtu; | |
905 | } | |
906 | ||
3b00944c YH |
907 | static struct dst_entry *icmp6_dst_gc_list; |
908 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 909 | |
3b00944c | 910 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 911 | struct neighbour *neigh, |
3b00944c | 912 | struct in6_addr *addr) |
1da177e4 LT |
913 | { |
914 | struct rt6_info *rt; | |
915 | struct inet6_dev *idev = in6_dev_get(dev); | |
916 | ||
917 | if (unlikely(idev == NULL)) | |
918 | return NULL; | |
919 | ||
920 | rt = ip6_dst_alloc(); | |
921 | if (unlikely(rt == NULL)) { | |
922 | in6_dev_put(idev); | |
923 | goto out; | |
924 | } | |
925 | ||
926 | dev_hold(dev); | |
927 | if (neigh) | |
928 | neigh_hold(neigh); | |
929 | else | |
930 | neigh = ndisc_get_neigh(dev, addr); | |
931 | ||
932 | rt->rt6i_dev = dev; | |
933 | rt->rt6i_idev = idev; | |
934 | rt->rt6i_nexthop = neigh; | |
935 | atomic_set(&rt->u.dst.__refcnt, 1); | |
936 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
937 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
938 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
3b00944c | 939 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
940 | |
941 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
942 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
943 | ? DST_HOST | |
1da177e4 LT |
944 | : 0; |
945 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
946 | rt->rt6i_dst.plen = 128; | |
947 | #endif | |
948 | ||
3b00944c YH |
949 | spin_lock_bh(&icmp6_dst_lock); |
950 | rt->u.dst.next = icmp6_dst_gc_list; | |
951 | icmp6_dst_gc_list = &rt->u.dst; | |
952 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 LT |
953 | |
954 | fib6_force_start_gc(); | |
955 | ||
956 | out: | |
40aa7b90 | 957 | return &rt->u.dst; |
1da177e4 LT |
958 | } |
959 | ||
3b00944c | 960 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
961 | { |
962 | struct dst_entry *dst, *next, **pprev; | |
963 | int freed; | |
964 | ||
965 | next = NULL; | |
1ab1457c | 966 | freed = 0; |
5d0bbeeb | 967 | |
3b00944c YH |
968 | spin_lock_bh(&icmp6_dst_lock); |
969 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 970 | |
1da177e4 LT |
971 | while ((dst = *pprev) != NULL) { |
972 | if (!atomic_read(&dst->__refcnt)) { | |
973 | *pprev = dst->next; | |
974 | dst_free(dst); | |
975 | freed++; | |
976 | } else { | |
977 | pprev = &dst->next; | |
978 | (*more)++; | |
979 | } | |
980 | } | |
981 | ||
3b00944c | 982 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 983 | |
1da177e4 LT |
984 | return freed; |
985 | } | |
986 | ||
569d3645 | 987 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 LT |
988 | { |
989 | static unsigned expire = 30*HZ; | |
990 | static unsigned long last_gc; | |
991 | unsigned long now = jiffies; | |
992 | ||
4990509f DL |
993 | if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && |
994 | atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) | |
1da177e4 LT |
995 | goto out; |
996 | ||
997 | expire++; | |
998 | fib6_run_gc(expire); | |
999 | last_gc = now; | |
1000 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
4990509f | 1001 | expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; |
1da177e4 LT |
1002 | |
1003 | out: | |
4990509f DL |
1004 | expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; |
1005 | return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size); | |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1009 | but results in cleaner routing tables. | |
1010 | ||
1011 | Remove it only when all the things will work! | |
1012 | */ | |
1013 | ||
1014 | static int ipv6_get_mtu(struct net_device *dev) | |
1015 | { | |
1016 | int mtu = IPV6_MIN_MTU; | |
1017 | struct inet6_dev *idev; | |
1018 | ||
1019 | idev = in6_dev_get(dev); | |
1020 | if (idev) { | |
1021 | mtu = idev->cnf.mtu6; | |
1022 | in6_dev_put(idev); | |
1023 | } | |
1024 | return mtu; | |
1025 | } | |
1026 | ||
1027 | int ipv6_get_hoplimit(struct net_device *dev) | |
1028 | { | |
1029 | int hoplimit = ipv6_devconf.hop_limit; | |
1030 | struct inet6_dev *idev; | |
1031 | ||
1032 | idev = in6_dev_get(dev); | |
1033 | if (idev) { | |
1034 | hoplimit = idev->cnf.hop_limit; | |
1035 | in6_dev_put(idev); | |
1036 | } | |
1037 | return hoplimit; | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * | |
1042 | */ | |
1043 | ||
86872cb5 | 1044 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1045 | { |
1046 | int err; | |
1da177e4 LT |
1047 | struct rt6_info *rt = NULL; |
1048 | struct net_device *dev = NULL; | |
1049 | struct inet6_dev *idev = NULL; | |
c71099ac | 1050 | struct fib6_table *table; |
1da177e4 LT |
1051 | int addr_type; |
1052 | ||
86872cb5 | 1053 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1054 | return -EINVAL; |
1055 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1056 | if (cfg->fc_src_len) |
1da177e4 LT |
1057 | return -EINVAL; |
1058 | #endif | |
86872cb5 | 1059 | if (cfg->fc_ifindex) { |
1da177e4 | 1060 | err = -ENODEV; |
881d966b | 1061 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
1da177e4 LT |
1062 | if (!dev) |
1063 | goto out; | |
1064 | idev = in6_dev_get(dev); | |
1065 | if (!idev) | |
1066 | goto out; | |
1067 | } | |
1068 | ||
86872cb5 TG |
1069 | if (cfg->fc_metric == 0) |
1070 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1071 | |
86872cb5 | 1072 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1073 | if (table == NULL) { |
1074 | err = -ENOBUFS; | |
1075 | goto out; | |
1076 | } | |
1077 | ||
1da177e4 LT |
1078 | rt = ip6_dst_alloc(); |
1079 | ||
1080 | if (rt == NULL) { | |
1081 | err = -ENOMEM; | |
1082 | goto out; | |
1083 | } | |
1084 | ||
1085 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1086 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1087 | |
86872cb5 TG |
1088 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1089 | cfg->fc_protocol = RTPROT_BOOT; | |
1090 | rt->rt6i_protocol = cfg->fc_protocol; | |
1091 | ||
1092 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1093 | |
1094 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1095 | rt->u.dst.input = ip6_mc_input; | |
1096 | else | |
1097 | rt->u.dst.input = ip6_forward; | |
1098 | ||
1099 | rt->u.dst.output = ip6_output; | |
1100 | ||
86872cb5 TG |
1101 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1102 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1103 | if (rt->rt6i_dst.plen == 128) |
1104 | rt->u.dst.flags = DST_HOST; | |
1105 | ||
1106 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1107 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1108 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1109 | #endif |
1110 | ||
86872cb5 | 1111 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1112 | |
1113 | /* We cannot add true routes via loopback here, | |
1114 | they would result in kernel looping; promote them to reject routes | |
1115 | */ | |
86872cb5 | 1116 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1117 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1118 | /* hold loopback dev/idev if we haven't done so. */ | |
2774c7ab | 1119 | if (dev != init_net.loopback_dev) { |
1da177e4 LT |
1120 | if (dev) { |
1121 | dev_put(dev); | |
1122 | in6_dev_put(idev); | |
1123 | } | |
2774c7ab | 1124 | dev = init_net.loopback_dev; |
1da177e4 LT |
1125 | dev_hold(dev); |
1126 | idev = in6_dev_get(dev); | |
1127 | if (!idev) { | |
1128 | err = -ENODEV; | |
1129 | goto out; | |
1130 | } | |
1131 | } | |
1132 | rt->u.dst.output = ip6_pkt_discard_out; | |
1133 | rt->u.dst.input = ip6_pkt_discard; | |
1134 | rt->u.dst.error = -ENETUNREACH; | |
1135 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1136 | goto install_route; | |
1137 | } | |
1138 | ||
86872cb5 | 1139 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1140 | struct in6_addr *gw_addr; |
1141 | int gwa_type; | |
1142 | ||
86872cb5 TG |
1143 | gw_addr = &cfg->fc_gateway; |
1144 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1145 | gwa_type = ipv6_addr_type(gw_addr); |
1146 | ||
1147 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1148 | struct rt6_info *grt; | |
1149 | ||
1150 | /* IPv6 strictly inhibits using not link-local | |
1151 | addresses as nexthop address. | |
1152 | Otherwise, router will not able to send redirects. | |
1153 | It is very good, but in some (rare!) circumstances | |
1154 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1155 | some exceptions. --ANK | |
1156 | */ | |
1157 | err = -EINVAL; | |
1158 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1159 | goto out; | |
1160 | ||
86872cb5 | 1161 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1162 | |
1163 | err = -EHOSTUNREACH; | |
1164 | if (grt == NULL) | |
1165 | goto out; | |
1166 | if (dev) { | |
1167 | if (dev != grt->rt6i_dev) { | |
1168 | dst_release(&grt->u.dst); | |
1169 | goto out; | |
1170 | } | |
1171 | } else { | |
1172 | dev = grt->rt6i_dev; | |
1173 | idev = grt->rt6i_idev; | |
1174 | dev_hold(dev); | |
1175 | in6_dev_hold(grt->rt6i_idev); | |
1176 | } | |
1177 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1178 | err = 0; | |
1179 | dst_release(&grt->u.dst); | |
1180 | ||
1181 | if (err) | |
1182 | goto out; | |
1183 | } | |
1184 | err = -EINVAL; | |
1185 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1186 | goto out; | |
1187 | } | |
1188 | ||
1189 | err = -ENODEV; | |
1190 | if (dev == NULL) | |
1191 | goto out; | |
1192 | ||
86872cb5 | 1193 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1194 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1195 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1196 | err = PTR_ERR(rt->rt6i_nexthop); | |
1197 | rt->rt6i_nexthop = NULL; | |
1198 | goto out; | |
1199 | } | |
1200 | } | |
1201 | ||
86872cb5 | 1202 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1203 | |
1204 | install_route: | |
86872cb5 TG |
1205 | if (cfg->fc_mx) { |
1206 | struct nlattr *nla; | |
1207 | int remaining; | |
1208 | ||
1209 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1210 | int type = nla_type(nla); |
86872cb5 TG |
1211 | |
1212 | if (type) { | |
1213 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1214 | err = -EINVAL; |
1215 | goto out; | |
1216 | } | |
86872cb5 TG |
1217 | |
1218 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1219 | } |
1da177e4 LT |
1220 | } |
1221 | } | |
1222 | ||
1223 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1224 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1225 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1226 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1227 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1228 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1229 | rt->u.dst.dev = dev; | |
1230 | rt->rt6i_idev = idev; | |
c71099ac | 1231 | rt->rt6i_table = table; |
86872cb5 | 1232 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1233 | |
1234 | out: | |
1235 | if (dev) | |
1236 | dev_put(dev); | |
1237 | if (idev) | |
1238 | in6_dev_put(idev); | |
1239 | if (rt) | |
40aa7b90 | 1240 | dst_free(&rt->u.dst); |
1da177e4 LT |
1241 | return err; |
1242 | } | |
1243 | ||
86872cb5 | 1244 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1245 | { |
1246 | int err; | |
c71099ac | 1247 | struct fib6_table *table; |
1da177e4 | 1248 | |
6c813a72 PM |
1249 | if (rt == &ip6_null_entry) |
1250 | return -ENOENT; | |
1251 | ||
c71099ac TG |
1252 | table = rt->rt6i_table; |
1253 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1254 | |
86872cb5 | 1255 | err = fib6_del(rt, info); |
1da177e4 LT |
1256 | dst_release(&rt->u.dst); |
1257 | ||
c71099ac | 1258 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1259 | |
1260 | return err; | |
1261 | } | |
1262 | ||
e0a1ad73 TG |
1263 | int ip6_del_rt(struct rt6_info *rt) |
1264 | { | |
4d1169c1 DL |
1265 | struct nl_info info = { |
1266 | .nl_net = &init_net, | |
1267 | }; | |
528c4ceb | 1268 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1269 | } |
1270 | ||
86872cb5 | 1271 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1272 | { |
c71099ac | 1273 | struct fib6_table *table; |
1da177e4 LT |
1274 | struct fib6_node *fn; |
1275 | struct rt6_info *rt; | |
1276 | int err = -ESRCH; | |
1277 | ||
86872cb5 | 1278 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1279 | if (table == NULL) |
1280 | return err; | |
1281 | ||
1282 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1283 | |
c71099ac | 1284 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1285 | &cfg->fc_dst, cfg->fc_dst_len, |
1286 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1287 | |
1da177e4 | 1288 | if (fn) { |
7cc48263 | 1289 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1290 | if (cfg->fc_ifindex && |
1da177e4 | 1291 | (rt->rt6i_dev == NULL || |
86872cb5 | 1292 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1293 | continue; |
86872cb5 TG |
1294 | if (cfg->fc_flags & RTF_GATEWAY && |
1295 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1296 | continue; |
86872cb5 | 1297 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1298 | continue; |
1299 | dst_hold(&rt->u.dst); | |
c71099ac | 1300 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1301 | |
86872cb5 | 1302 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1303 | } |
1304 | } | |
c71099ac | 1305 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1306 | |
1307 | return err; | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * Handle redirects | |
1312 | */ | |
a6279458 YH |
1313 | struct ip6rd_flowi { |
1314 | struct flowi fl; | |
1315 | struct in6_addr gateway; | |
1316 | }; | |
1317 | ||
1318 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1319 | struct flowi *fl, | |
1320 | int flags) | |
1da177e4 | 1321 | { |
a6279458 YH |
1322 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1323 | struct rt6_info *rt; | |
e843b9e1 | 1324 | struct fib6_node *fn; |
c71099ac | 1325 | |
1da177e4 | 1326 | /* |
e843b9e1 YH |
1327 | * Get the "current" route for this destination and |
1328 | * check if the redirect has come from approriate router. | |
1329 | * | |
1330 | * RFC 2461 specifies that redirects should only be | |
1331 | * accepted if they come from the nexthop to the target. | |
1332 | * Due to the way the routes are chosen, this notion | |
1333 | * is a bit fuzzy and one might need to check all possible | |
1334 | * routes. | |
1da177e4 | 1335 | */ |
1da177e4 | 1336 | |
c71099ac | 1337 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1338 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1339 | restart: |
7cc48263 | 1340 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1341 | /* |
1342 | * Current route is on-link; redirect is always invalid. | |
1343 | * | |
1344 | * Seems, previous statement is not true. It could | |
1345 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1346 | * But then router serving it might decide, that we should | |
1347 | * know truth 8)8) --ANK (980726). | |
1348 | */ | |
1349 | if (rt6_check_expired(rt)) | |
1350 | continue; | |
1351 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1352 | continue; | |
a6279458 | 1353 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1354 | continue; |
a6279458 | 1355 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1356 | continue; |
1357 | break; | |
1358 | } | |
a6279458 | 1359 | |
cb15d9c2 | 1360 | if (!rt) |
a6279458 | 1361 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1362 | BACKTRACK(&fl->fl6_src); |
1363 | out: | |
a6279458 YH |
1364 | dst_hold(&rt->u.dst); |
1365 | ||
c71099ac | 1366 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1367 | |
a6279458 YH |
1368 | return rt; |
1369 | }; | |
1370 | ||
1371 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1372 | struct in6_addr *src, | |
1373 | struct in6_addr *gateway, | |
1374 | struct net_device *dev) | |
1375 | { | |
adaa70bb | 1376 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1377 | struct ip6rd_flowi rdfl = { |
1378 | .fl = { | |
1379 | .oif = dev->ifindex, | |
1380 | .nl_u = { | |
1381 | .ip6_u = { | |
1382 | .daddr = *dest, | |
1383 | .saddr = *src, | |
1384 | }, | |
1385 | }, | |
1386 | }, | |
1387 | .gateway = *gateway, | |
1388 | }; | |
adaa70bb TG |
1389 | |
1390 | if (rt6_need_strict(dest)) | |
1391 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1392 | |
1393 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1394 | } | |
1395 | ||
1396 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1397 | struct in6_addr *saddr, | |
1398 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1399 | { | |
1400 | struct rt6_info *rt, *nrt = NULL; | |
1401 | struct netevent_redirect netevent; | |
1402 | ||
1403 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1404 | ||
1405 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1406 | if (net_ratelimit()) |
1407 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1408 | "for redirect target\n"); | |
a6279458 | 1409 | goto out; |
1da177e4 LT |
1410 | } |
1411 | ||
1da177e4 LT |
1412 | /* |
1413 | * We have finally decided to accept it. | |
1414 | */ | |
1415 | ||
1ab1457c | 1416 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1417 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1418 | NEIGH_UPDATE_F_OVERRIDE| | |
1419 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1420 | NEIGH_UPDATE_F_ISROUTER)) | |
1421 | ); | |
1422 | ||
1423 | /* | |
1424 | * Redirect received -> path was valid. | |
1425 | * Look, redirects are sent only in response to data packets, | |
1426 | * so that this nexthop apparently is reachable. --ANK | |
1427 | */ | |
1428 | dst_confirm(&rt->u.dst); | |
1429 | ||
1430 | /* Duplicate redirect: silently ignore. */ | |
1431 | if (neigh == rt->u.dst.neighbour) | |
1432 | goto out; | |
1433 | ||
1434 | nrt = ip6_rt_copy(rt); | |
1435 | if (nrt == NULL) | |
1436 | goto out; | |
1437 | ||
1438 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1439 | if (on_link) | |
1440 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1441 | ||
1442 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1443 | nrt->rt6i_dst.plen = 128; | |
1444 | nrt->u.dst.flags |= DST_HOST; | |
1445 | ||
1446 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1447 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1448 | /* Reset pmtu, it may be better */ | |
1449 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1450 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1451 | ||
40e22e8f | 1452 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1453 | goto out; |
1454 | ||
8d71740c TT |
1455 | netevent.old = &rt->u.dst; |
1456 | netevent.new = &nrt->u.dst; | |
1457 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1458 | ||
1da177e4 | 1459 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1460 | ip6_del_rt(rt); |
1da177e4 LT |
1461 | return; |
1462 | } | |
1463 | ||
1464 | out: | |
1ab1457c | 1465 | dst_release(&rt->u.dst); |
1da177e4 LT |
1466 | return; |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * Handle ICMP "packet too big" messages | |
1471 | * i.e. Path MTU discovery | |
1472 | */ | |
1473 | ||
1474 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1475 | struct net_device *dev, u32 pmtu) | |
1476 | { | |
1477 | struct rt6_info *rt, *nrt; | |
1478 | int allfrag = 0; | |
1479 | ||
1480 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1481 | if (rt == NULL) | |
1482 | return; | |
1483 | ||
1484 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1485 | goto out; | |
1486 | ||
1487 | if (pmtu < IPV6_MIN_MTU) { | |
1488 | /* | |
1ab1457c | 1489 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1490 | * MTU (1280) and a fragment header should always be included |
1491 | * after a node receiving Too Big message reporting PMTU is | |
1492 | * less than the IPv6 Minimum Link MTU. | |
1493 | */ | |
1494 | pmtu = IPV6_MIN_MTU; | |
1495 | allfrag = 1; | |
1496 | } | |
1497 | ||
1498 | /* New mtu received -> path was valid. | |
1499 | They are sent only in response to data packets, | |
1500 | so that this nexthop apparently is reachable. --ANK | |
1501 | */ | |
1502 | dst_confirm(&rt->u.dst); | |
1503 | ||
1504 | /* Host route. If it is static, it would be better | |
1505 | not to override it, but add new one, so that | |
1506 | when cache entry will expire old pmtu | |
1507 | would return automatically. | |
1508 | */ | |
1509 | if (rt->rt6i_flags & RTF_CACHE) { | |
1510 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1511 | if (allfrag) | |
1512 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
4990509f | 1513 | dst_set_expires(&rt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1514 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1515 | goto out; | |
1516 | } | |
1517 | ||
1518 | /* Network route. | |
1519 | Two cases are possible: | |
1520 | 1. It is connected route. Action: COW | |
1521 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1522 | */ | |
d5315b50 | 1523 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1524 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1525 | else |
1526 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1527 | |
d5315b50 | 1528 | if (nrt) { |
a1e78363 YH |
1529 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1530 | if (allfrag) | |
1531 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1532 | ||
1533 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1534 | * happened within 5 mins, the recommended timer is 10 mins. | |
1535 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1536 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1537 | * and detecting PMTU increase will be automatically happened. | |
1538 | */ | |
4990509f | 1539 | dst_set_expires(&nrt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1540 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1541 | ||
40e22e8f | 1542 | ip6_ins_rt(nrt); |
1da177e4 | 1543 | } |
1da177e4 LT |
1544 | out: |
1545 | dst_release(&rt->u.dst); | |
1546 | } | |
1547 | ||
1548 | /* | |
1549 | * Misc support functions | |
1550 | */ | |
1551 | ||
1552 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1553 | { | |
1554 | struct rt6_info *rt = ip6_dst_alloc(); | |
1555 | ||
1556 | if (rt) { | |
1557 | rt->u.dst.input = ort->u.dst.input; | |
1558 | rt->u.dst.output = ort->u.dst.output; | |
1559 | ||
1560 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1561 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1562 | rt->u.dst.dev = ort->u.dst.dev; |
1563 | if (rt->u.dst.dev) | |
1564 | dev_hold(rt->u.dst.dev); | |
1565 | rt->rt6i_idev = ort->rt6i_idev; | |
1566 | if (rt->rt6i_idev) | |
1567 | in6_dev_hold(rt->rt6i_idev); | |
1568 | rt->u.dst.lastuse = jiffies; | |
1569 | rt->rt6i_expires = 0; | |
1570 | ||
1571 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1572 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1573 | rt->rt6i_metric = 0; | |
1574 | ||
1575 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1576 | #ifdef CONFIG_IPV6_SUBTREES | |
1577 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1578 | #endif | |
c71099ac | 1579 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1580 | } |
1581 | return rt; | |
1582 | } | |
1583 | ||
70ceb4f5 YH |
1584 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1585 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1586 | struct in6_addr *gwaddr, int ifindex) | |
1587 | { | |
1588 | struct fib6_node *fn; | |
1589 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1590 | struct fib6_table *table; |
1591 | ||
1592 | table = fib6_get_table(RT6_TABLE_INFO); | |
1593 | if (table == NULL) | |
1594 | return NULL; | |
70ceb4f5 | 1595 | |
c71099ac TG |
1596 | write_lock_bh(&table->tb6_lock); |
1597 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1598 | if (!fn) |
1599 | goto out; | |
1600 | ||
7cc48263 | 1601 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1602 | if (rt->rt6i_dev->ifindex != ifindex) |
1603 | continue; | |
1604 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1605 | continue; | |
1606 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1607 | continue; | |
1608 | dst_hold(&rt->u.dst); | |
1609 | break; | |
1610 | } | |
1611 | out: | |
c71099ac | 1612 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1613 | return rt; |
1614 | } | |
1615 | ||
1616 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1617 | struct in6_addr *gwaddr, int ifindex, | |
1618 | unsigned pref) | |
1619 | { | |
86872cb5 TG |
1620 | struct fib6_config cfg = { |
1621 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1622 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1623 | .fc_ifindex = ifindex, |
1624 | .fc_dst_len = prefixlen, | |
1625 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1626 | RTF_UP | RTF_PREF(pref), | |
1627 | }; | |
1628 | ||
1629 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1630 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1631 | |
e317da96 YH |
1632 | /* We should treat it as a default route if prefix length is 0. */ |
1633 | if (!prefixlen) | |
86872cb5 | 1634 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1635 | |
86872cb5 | 1636 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1637 | |
1638 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1639 | } | |
1640 | #endif | |
1641 | ||
1da177e4 | 1642 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1643 | { |
1da177e4 | 1644 | struct rt6_info *rt; |
c71099ac | 1645 | struct fib6_table *table; |
1da177e4 | 1646 | |
c71099ac TG |
1647 | table = fib6_get_table(RT6_TABLE_DFLT); |
1648 | if (table == NULL) | |
1649 | return NULL; | |
1da177e4 | 1650 | |
c71099ac | 1651 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1652 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1653 | if (dev == rt->rt6i_dev && |
045927ff | 1654 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1655 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1656 | break; | |
1657 | } | |
1658 | if (rt) | |
1659 | dst_hold(&rt->u.dst); | |
c71099ac | 1660 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1661 | return rt; |
1662 | } | |
1663 | ||
c7dc89c0 FT |
1664 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1665 | ||
1da177e4 | 1666 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1667 | struct net_device *dev, |
1668 | unsigned int pref) | |
1da177e4 | 1669 | { |
86872cb5 TG |
1670 | struct fib6_config cfg = { |
1671 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1672 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1673 | .fc_ifindex = dev->ifindex, |
1674 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1675 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1676 | }; | |
1da177e4 | 1677 | |
86872cb5 | 1678 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1679 | |
86872cb5 | 1680 | ip6_route_add(&cfg); |
1da177e4 | 1681 | |
1da177e4 LT |
1682 | return rt6_get_dflt_router(gwaddr, dev); |
1683 | } | |
1684 | ||
1685 | void rt6_purge_dflt_routers(void) | |
1686 | { | |
1687 | struct rt6_info *rt; | |
c71099ac TG |
1688 | struct fib6_table *table; |
1689 | ||
1690 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1691 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1692 | if (table == NULL) | |
1693 | return; | |
1da177e4 LT |
1694 | |
1695 | restart: | |
c71099ac | 1696 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1697 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1698 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1699 | dst_hold(&rt->u.dst); | |
c71099ac | 1700 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1701 | ip6_del_rt(rt); |
1da177e4 LT |
1702 | goto restart; |
1703 | } | |
1704 | } | |
c71099ac | 1705 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1706 | } |
1707 | ||
86872cb5 TG |
1708 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1709 | struct fib6_config *cfg) | |
1710 | { | |
1711 | memset(cfg, 0, sizeof(*cfg)); | |
1712 | ||
1713 | cfg->fc_table = RT6_TABLE_MAIN; | |
1714 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1715 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1716 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1717 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1718 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1719 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1720 | ||
f1243c2d BT |
1721 | cfg->fc_nlinfo.nl_net = &init_net; |
1722 | ||
86872cb5 TG |
1723 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1724 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1725 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1726 | } | |
1727 | ||
1da177e4 LT |
1728 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1729 | { | |
86872cb5 | 1730 | struct fib6_config cfg; |
1da177e4 LT |
1731 | struct in6_rtmsg rtmsg; |
1732 | int err; | |
1733 | ||
1734 | switch(cmd) { | |
1735 | case SIOCADDRT: /* Add a route */ | |
1736 | case SIOCDELRT: /* Delete a route */ | |
1737 | if (!capable(CAP_NET_ADMIN)) | |
1738 | return -EPERM; | |
1739 | err = copy_from_user(&rtmsg, arg, | |
1740 | sizeof(struct in6_rtmsg)); | |
1741 | if (err) | |
1742 | return -EFAULT; | |
86872cb5 TG |
1743 | |
1744 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1745 | ||
1da177e4 LT |
1746 | rtnl_lock(); |
1747 | switch (cmd) { | |
1748 | case SIOCADDRT: | |
86872cb5 | 1749 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1750 | break; |
1751 | case SIOCDELRT: | |
86872cb5 | 1752 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1753 | break; |
1754 | default: | |
1755 | err = -EINVAL; | |
1756 | } | |
1757 | rtnl_unlock(); | |
1758 | ||
1759 | return err; | |
3ff50b79 | 1760 | } |
1da177e4 LT |
1761 | |
1762 | return -EINVAL; | |
1763 | } | |
1764 | ||
1765 | /* | |
1766 | * Drop the packet on the floor | |
1767 | */ | |
1768 | ||
50eb431d | 1769 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1770 | { |
612f09e8 YH |
1771 | int type; |
1772 | switch (ipstats_mib_noroutes) { | |
1773 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1774 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1775 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1776 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1777 | break; | |
1778 | } | |
1779 | /* FALLTHROUGH */ | |
1780 | case IPSTATS_MIB_OUTNOROUTES: | |
1781 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1782 | break; | |
1783 | } | |
9ce8ade0 | 1784 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1785 | kfree_skb(skb); |
1786 | return 0; | |
1787 | } | |
1788 | ||
9ce8ade0 TG |
1789 | static int ip6_pkt_discard(struct sk_buff *skb) |
1790 | { | |
612f09e8 | 1791 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1792 | } |
1793 | ||
20380731 | 1794 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1795 | { |
1796 | skb->dev = skb->dst->dev; | |
612f09e8 | 1797 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1798 | } |
1799 | ||
6723ab54 DM |
1800 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1801 | ||
9ce8ade0 TG |
1802 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1803 | { | |
612f09e8 | 1804 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1805 | } |
1806 | ||
1807 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1808 | { | |
1809 | skb->dev = skb->dst->dev; | |
612f09e8 | 1810 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1811 | } |
1812 | ||
6723ab54 DM |
1813 | #endif |
1814 | ||
1da177e4 LT |
1815 | /* |
1816 | * Allocate a dst for local (unicast / anycast) address. | |
1817 | */ | |
1818 | ||
1819 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1820 | const struct in6_addr *addr, | |
1821 | int anycast) | |
1822 | { | |
1823 | struct rt6_info *rt = ip6_dst_alloc(); | |
1824 | ||
1825 | if (rt == NULL) | |
1826 | return ERR_PTR(-ENOMEM); | |
1827 | ||
2774c7ab | 1828 | dev_hold(init_net.loopback_dev); |
1da177e4 LT |
1829 | in6_dev_hold(idev); |
1830 | ||
1831 | rt->u.dst.flags = DST_HOST; | |
1832 | rt->u.dst.input = ip6_input; | |
1833 | rt->u.dst.output = ip6_output; | |
2774c7ab | 1834 | rt->rt6i_dev = init_net.loopback_dev; |
1da177e4 LT |
1835 | rt->rt6i_idev = idev; |
1836 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1837 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1838 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1839 | rt->u.dst.obsolete = -1; | |
1840 | ||
1841 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1842 | if (anycast) |
1843 | rt->rt6i_flags |= RTF_ANYCAST; | |
1844 | else | |
1da177e4 LT |
1845 | rt->rt6i_flags |= RTF_LOCAL; |
1846 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1847 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1848 | dst_free(&rt->u.dst); |
1da177e4 LT |
1849 | return ERR_PTR(-ENOMEM); |
1850 | } | |
1851 | ||
1852 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1853 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1854 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1855 | |
1856 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1857 | ||
1858 | return rt; | |
1859 | } | |
1860 | ||
1861 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1862 | { | |
1863 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1864 | rt != &ip6_null_entry) { | |
1865 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1866 | return -1; | |
1867 | } | |
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | void rt6_ifdown(struct net_device *dev) | |
1872 | { | |
c71099ac | 1873 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1874 | } |
1875 | ||
1876 | struct rt6_mtu_change_arg | |
1877 | { | |
1878 | struct net_device *dev; | |
1879 | unsigned mtu; | |
1880 | }; | |
1881 | ||
1882 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1883 | { | |
1884 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1885 | struct inet6_dev *idev; | |
1886 | ||
1887 | /* In IPv6 pmtu discovery is not optional, | |
1888 | so that RTAX_MTU lock cannot disable it. | |
1889 | We still use this lock to block changes | |
1890 | caused by addrconf/ndisc. | |
1891 | */ | |
1892 | ||
1893 | idev = __in6_dev_get(arg->dev); | |
1894 | if (idev == NULL) | |
1895 | return 0; | |
1896 | ||
1897 | /* For administrative MTU increase, there is no way to discover | |
1898 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1899 | Since RFC 1981 doesn't include administrative MTU increase | |
1900 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1901 | */ | |
1902 | /* | |
1903 | If new MTU is less than route PMTU, this new MTU will be the | |
1904 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1905 | decreases; if new MTU is greater than route PMTU, and the | |
1906 | old MTU is the lowest MTU in the path, update the route PMTU | |
1907 | to reflect the increase. In this case if the other nodes' MTU | |
1908 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1909 | PMTU discouvery. | |
1910 | */ | |
1911 | if (rt->rt6i_dev == arg->dev && | |
1912 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1913 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1914 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1915 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1916 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
566cfd8f SA |
1917 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
1918 | } | |
1da177e4 LT |
1919 | return 0; |
1920 | } | |
1921 | ||
1922 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1923 | { | |
c71099ac TG |
1924 | struct rt6_mtu_change_arg arg = { |
1925 | .dev = dev, | |
1926 | .mtu = mtu, | |
1927 | }; | |
1da177e4 | 1928 | |
c71099ac | 1929 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1930 | } |
1931 | ||
ef7c79ed | 1932 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1933 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1934 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1935 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1936 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1937 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1938 | }; | |
1939 | ||
1940 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1941 | struct fib6_config *cfg) | |
1da177e4 | 1942 | { |
86872cb5 TG |
1943 | struct rtmsg *rtm; |
1944 | struct nlattr *tb[RTA_MAX+1]; | |
1945 | int err; | |
1da177e4 | 1946 | |
86872cb5 TG |
1947 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1948 | if (err < 0) | |
1949 | goto errout; | |
1da177e4 | 1950 | |
86872cb5 TG |
1951 | err = -EINVAL; |
1952 | rtm = nlmsg_data(nlh); | |
1953 | memset(cfg, 0, sizeof(*cfg)); | |
1954 | ||
1955 | cfg->fc_table = rtm->rtm_table; | |
1956 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1957 | cfg->fc_src_len = rtm->rtm_src_len; | |
1958 | cfg->fc_flags = RTF_UP; | |
1959 | cfg->fc_protocol = rtm->rtm_protocol; | |
1960 | ||
1961 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1962 | cfg->fc_flags |= RTF_REJECT; | |
1963 | ||
1964 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1965 | cfg->fc_nlinfo.nlh = nlh; | |
2216b483 | 1966 | cfg->fc_nlinfo.nl_net = skb->sk->sk_net; |
86872cb5 TG |
1967 | |
1968 | if (tb[RTA_GATEWAY]) { | |
1969 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1970 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1971 | } |
86872cb5 TG |
1972 | |
1973 | if (tb[RTA_DST]) { | |
1974 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1975 | ||
1976 | if (nla_len(tb[RTA_DST]) < plen) | |
1977 | goto errout; | |
1978 | ||
1979 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1980 | } |
86872cb5 TG |
1981 | |
1982 | if (tb[RTA_SRC]) { | |
1983 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1984 | ||
1985 | if (nla_len(tb[RTA_SRC]) < plen) | |
1986 | goto errout; | |
1987 | ||
1988 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1989 | } |
86872cb5 TG |
1990 | |
1991 | if (tb[RTA_OIF]) | |
1992 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1993 | ||
1994 | if (tb[RTA_PRIORITY]) | |
1995 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
1996 | ||
1997 | if (tb[RTA_METRICS]) { | |
1998 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
1999 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2000 | } |
86872cb5 TG |
2001 | |
2002 | if (tb[RTA_TABLE]) | |
2003 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2004 | ||
2005 | err = 0; | |
2006 | errout: | |
2007 | return err; | |
1da177e4 LT |
2008 | } |
2009 | ||
c127ea2c | 2010 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2011 | { |
b854272b | 2012 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2013 | struct fib6_config cfg; |
2014 | int err; | |
1da177e4 | 2015 | |
b854272b DL |
2016 | if (net != &init_net) |
2017 | return -EINVAL; | |
2018 | ||
86872cb5 TG |
2019 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2020 | if (err < 0) | |
2021 | return err; | |
2022 | ||
2023 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2024 | } |
2025 | ||
c127ea2c | 2026 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2027 | { |
b854272b | 2028 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2029 | struct fib6_config cfg; |
2030 | int err; | |
1da177e4 | 2031 | |
b854272b DL |
2032 | if (net != &init_net) |
2033 | return -EINVAL; | |
2034 | ||
86872cb5 TG |
2035 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2036 | if (err < 0) | |
2037 | return err; | |
2038 | ||
2039 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2040 | } |
2041 | ||
339bf98f TG |
2042 | static inline size_t rt6_nlmsg_size(void) |
2043 | { | |
2044 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2045 | + nla_total_size(16) /* RTA_SRC */ | |
2046 | + nla_total_size(16) /* RTA_DST */ | |
2047 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2048 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2049 | + nla_total_size(4) /* RTA_TABLE */ | |
2050 | + nla_total_size(4) /* RTA_IIF */ | |
2051 | + nla_total_size(4) /* RTA_OIF */ | |
2052 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2053 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2054 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2055 | } | |
2056 | ||
1da177e4 | 2057 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2058 | struct in6_addr *dst, struct in6_addr *src, |
2059 | int iif, int type, u32 pid, u32 seq, | |
2060 | int prefix, unsigned int flags) | |
1da177e4 LT |
2061 | { |
2062 | struct rtmsg *rtm; | |
2d7202bf | 2063 | struct nlmsghdr *nlh; |
e3703b3d | 2064 | long expires; |
9e762a4a | 2065 | u32 table; |
1da177e4 LT |
2066 | |
2067 | if (prefix) { /* user wants prefix routes only */ | |
2068 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2069 | /* success since this is not a prefix route */ | |
2070 | return 1; | |
2071 | } | |
2072 | } | |
2073 | ||
2d7202bf TG |
2074 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2075 | if (nlh == NULL) | |
26932566 | 2076 | return -EMSGSIZE; |
2d7202bf TG |
2077 | |
2078 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2079 | rtm->rtm_family = AF_INET6; |
2080 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2081 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2082 | rtm->rtm_tos = 0; | |
c71099ac | 2083 | if (rt->rt6i_table) |
9e762a4a | 2084 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2085 | else |
9e762a4a PM |
2086 | table = RT6_TABLE_UNSPEC; |
2087 | rtm->rtm_table = table; | |
2d7202bf | 2088 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2089 | if (rt->rt6i_flags&RTF_REJECT) |
2090 | rtm->rtm_type = RTN_UNREACHABLE; | |
2091 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2092 | rtm->rtm_type = RTN_LOCAL; | |
2093 | else | |
2094 | rtm->rtm_type = RTN_UNICAST; | |
2095 | rtm->rtm_flags = 0; | |
2096 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2097 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2098 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2099 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2100 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2101 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2102 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2103 | rtm->rtm_protocol = RTPROT_RA; | |
2104 | ||
2105 | if (rt->rt6i_flags&RTF_CACHE) | |
2106 | rtm->rtm_flags |= RTM_F_CLONED; | |
2107 | ||
2108 | if (dst) { | |
2d7202bf | 2109 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2110 | rtm->rtm_dst_len = 128; |
1da177e4 | 2111 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2112 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2113 | #ifdef CONFIG_IPV6_SUBTREES |
2114 | if (src) { | |
2d7202bf | 2115 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2116 | rtm->rtm_src_len = 128; |
1da177e4 | 2117 | } else if (rtm->rtm_src_len) |
2d7202bf | 2118 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2119 | #endif |
2120 | if (iif) | |
2d7202bf | 2121 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2122 | else if (dst) { |
2123 | struct in6_addr saddr_buf; | |
5e5f3f0f YH |
2124 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
2125 | dst, &saddr_buf) == 0) | |
2d7202bf | 2126 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2127 | } |
2d7202bf | 2128 | |
1da177e4 | 2129 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2130 | goto nla_put_failure; |
2131 | ||
1da177e4 | 2132 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2133 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2134 | ||
1da177e4 | 2135 | if (rt->u.dst.dev) |
2d7202bf TG |
2136 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2137 | ||
2138 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2139 | |
2140 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2141 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2142 | expires, rt->u.dst.error) < 0) | |
2143 | goto nla_put_failure; | |
2d7202bf TG |
2144 | |
2145 | return nlmsg_end(skb, nlh); | |
2146 | ||
2147 | nla_put_failure: | |
26932566 PM |
2148 | nlmsg_cancel(skb, nlh); |
2149 | return -EMSGSIZE; | |
1da177e4 LT |
2150 | } |
2151 | ||
1b43af54 | 2152 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2153 | { |
2154 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2155 | int prefix; | |
2156 | ||
2d7202bf TG |
2157 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2158 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2159 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2160 | } else | |
2161 | prefix = 0; | |
2162 | ||
2163 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2164 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2165 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2166 | } |
2167 | ||
c127ea2c | 2168 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2169 | { |
b854272b | 2170 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2171 | struct nlattr *tb[RTA_MAX+1]; |
2172 | struct rt6_info *rt; | |
1da177e4 | 2173 | struct sk_buff *skb; |
ab364a6f | 2174 | struct rtmsg *rtm; |
1da177e4 | 2175 | struct flowi fl; |
ab364a6f | 2176 | int err, iif = 0; |
1da177e4 | 2177 | |
b854272b DL |
2178 | if (net != &init_net) |
2179 | return -EINVAL; | |
2180 | ||
ab364a6f TG |
2181 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2182 | if (err < 0) | |
2183 | goto errout; | |
1da177e4 | 2184 | |
ab364a6f | 2185 | err = -EINVAL; |
1da177e4 | 2186 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2187 | |
ab364a6f TG |
2188 | if (tb[RTA_SRC]) { |
2189 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2190 | goto errout; | |
2191 | ||
2192 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2193 | } | |
2194 | ||
2195 | if (tb[RTA_DST]) { | |
2196 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2197 | goto errout; | |
2198 | ||
2199 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2200 | } | |
2201 | ||
2202 | if (tb[RTA_IIF]) | |
2203 | iif = nla_get_u32(tb[RTA_IIF]); | |
2204 | ||
2205 | if (tb[RTA_OIF]) | |
2206 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2207 | |
2208 | if (iif) { | |
2209 | struct net_device *dev; | |
881d966b | 2210 | dev = __dev_get_by_index(&init_net, iif); |
1da177e4 LT |
2211 | if (!dev) { |
2212 | err = -ENODEV; | |
ab364a6f | 2213 | goto errout; |
1da177e4 LT |
2214 | } |
2215 | } | |
2216 | ||
ab364a6f TG |
2217 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2218 | if (skb == NULL) { | |
2219 | err = -ENOBUFS; | |
2220 | goto errout; | |
2221 | } | |
1da177e4 | 2222 | |
ab364a6f TG |
2223 | /* Reserve room for dummy headers, this skb can pass |
2224 | through good chunk of routing engine. | |
2225 | */ | |
459a98ed | 2226 | skb_reset_mac_header(skb); |
ab364a6f | 2227 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2228 | |
ab364a6f | 2229 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2230 | skb->dst = &rt->u.dst; |
2231 | ||
ab364a6f | 2232 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2233 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2234 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2235 | if (err < 0) { |
ab364a6f TG |
2236 | kfree_skb(skb); |
2237 | goto errout; | |
1da177e4 LT |
2238 | } |
2239 | ||
97c53cac | 2240 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2241 | errout: |
1da177e4 | 2242 | return err; |
1da177e4 LT |
2243 | } |
2244 | ||
86872cb5 | 2245 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2246 | { |
2247 | struct sk_buff *skb; | |
528c4ceb DL |
2248 | u32 seq; |
2249 | int err; | |
2250 | ||
2251 | err = -ENOBUFS; | |
2252 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2253 | |
339bf98f | 2254 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2255 | if (skb == NULL) |
2256 | goto errout; | |
2257 | ||
528c4ceb DL |
2258 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2259 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2260 | if (err < 0) { |
2261 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2262 | WARN_ON(err == -EMSGSIZE); | |
2263 | kfree_skb(skb); | |
2264 | goto errout; | |
2265 | } | |
528c4ceb DL |
2266 | err = rtnl_notify(skb, &init_net, info->pid, |
2267 | RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any()); | |
21713ebc TG |
2268 | errout: |
2269 | if (err < 0) | |
97c53cac | 2270 | rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2271 | } |
2272 | ||
2273 | /* | |
2274 | * /proc | |
2275 | */ | |
2276 | ||
2277 | #ifdef CONFIG_PROC_FS | |
2278 | ||
2279 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2280 | ||
2281 | struct rt6_proc_arg | |
2282 | { | |
2283 | char *buffer; | |
2284 | int offset; | |
2285 | int length; | |
2286 | int skip; | |
2287 | int len; | |
2288 | }; | |
2289 | ||
2290 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2291 | { | |
33120b30 | 2292 | struct seq_file *m = p_arg; |
1da177e4 | 2293 | |
33120b30 AD |
2294 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2295 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2296 | |
2297 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2298 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2299 | rt->rt6i_src.plen); | |
1da177e4 | 2300 | #else |
33120b30 | 2301 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2302 | #endif |
2303 | ||
2304 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2305 | seq_printf(m, NIP6_SEQFMT, |
2306 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2307 | } else { |
33120b30 | 2308 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2309 | } |
33120b30 AD |
2310 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2311 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2312 | rt->u.dst.__use, rt->rt6i_flags, | |
2313 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2314 | return 0; |
2315 | } | |
2316 | ||
33120b30 | 2317 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2318 | { |
33120b30 AD |
2319 | fib6_clean_all(rt6_info_route, 0, m); |
2320 | return 0; | |
2321 | } | |
1da177e4 | 2322 | |
33120b30 AD |
2323 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2324 | { | |
2325 | return single_open(file, ipv6_route_show, NULL); | |
1da177e4 LT |
2326 | } |
2327 | ||
33120b30 AD |
2328 | static const struct file_operations ipv6_route_proc_fops = { |
2329 | .owner = THIS_MODULE, | |
2330 | .open = ipv6_route_open, | |
2331 | .read = seq_read, | |
2332 | .llseek = seq_lseek, | |
2333 | .release = single_release, | |
2334 | }; | |
2335 | ||
1da177e4 LT |
2336 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2337 | { | |
2338 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2339 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2340 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2341 | rt6_stats.fib_rt_cache, | |
2342 | atomic_read(&ip6_dst_ops.entries), | |
2343 | rt6_stats.fib_discarded_routes); | |
2344 | ||
2345 | return 0; | |
2346 | } | |
2347 | ||
2348 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2349 | { | |
2350 | return single_open(file, rt6_stats_seq_show, NULL); | |
2351 | } | |
2352 | ||
9a32144e | 2353 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2354 | .owner = THIS_MODULE, |
2355 | .open = rt6_stats_seq_open, | |
2356 | .read = seq_read, | |
2357 | .llseek = seq_lseek, | |
2358 | .release = single_release, | |
2359 | }; | |
75314fb3 DL |
2360 | |
2361 | static int ipv6_route_proc_init(struct net *net) | |
2362 | { | |
2363 | int ret = -ENOMEM; | |
2364 | if (!proc_net_fops_create(net, "ipv6_route", | |
2365 | 0, &ipv6_route_proc_fops)) | |
2366 | goto out; | |
2367 | ||
2368 | if (!proc_net_fops_create(net, "rt6_stats", | |
2369 | S_IRUGO, &rt6_stats_seq_fops)) | |
2370 | goto out_ipv6_route; | |
2371 | ||
2372 | ret = 0; | |
2373 | out: | |
2374 | return ret; | |
2375 | out_ipv6_route: | |
2376 | proc_net_remove(net, "ipv6_route"); | |
2377 | goto out; | |
2378 | } | |
2379 | ||
2380 | static void ipv6_route_proc_fini(struct net *net) | |
2381 | { | |
2382 | proc_net_remove(net, "ipv6_route"); | |
2383 | proc_net_remove(net, "rt6_stats"); | |
2384 | } | |
2385 | #else | |
2386 | static inline int ipv6_route_proc_init(struct net *net) | |
2387 | { | |
2388 | return 0; | |
2389 | } | |
2390 | static inline void ipv6_route_proc_fini(struct net *net) | |
2391 | { | |
2392 | return ; | |
2393 | } | |
1da177e4 LT |
2394 | #endif /* CONFIG_PROC_FS */ |
2395 | ||
2396 | #ifdef CONFIG_SYSCTL | |
2397 | ||
1da177e4 LT |
2398 | static |
2399 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2400 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2401 | { | |
4990509f | 2402 | int delay = init_net.ipv6.sysctl.flush_delay; |
1da177e4 LT |
2403 | if (write) { |
2404 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
4990509f | 2405 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay); |
1da177e4 LT |
2406 | return 0; |
2407 | } else | |
2408 | return -EINVAL; | |
2409 | } | |
2410 | ||
760f2d01 | 2411 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2412 | { |
1da177e4 | 2413 | .procname = "flush", |
4990509f | 2414 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2415 | .maxlen = sizeof(int), |
89c8b3a1 | 2416 | .mode = 0200, |
1ab1457c | 2417 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2418 | }, |
2419 | { | |
2420 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2421 | .procname = "gc_thresh", | |
1ab1457c | 2422 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2423 | .maxlen = sizeof(int), |
2424 | .mode = 0644, | |
1ab1457c | 2425 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2426 | }, |
2427 | { | |
2428 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2429 | .procname = "max_size", | |
4990509f | 2430 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2431 | .maxlen = sizeof(int), |
2432 | .mode = 0644, | |
1ab1457c | 2433 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2434 | }, |
2435 | { | |
2436 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2437 | .procname = "gc_min_interval", | |
4990509f | 2438 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2439 | .maxlen = sizeof(int), |
2440 | .mode = 0644, | |
1ab1457c | 2441 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2442 | .strategy = &sysctl_jiffies, |
2443 | }, | |
2444 | { | |
2445 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2446 | .procname = "gc_timeout", | |
4990509f | 2447 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2448 | .maxlen = sizeof(int), |
2449 | .mode = 0644, | |
1ab1457c | 2450 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2451 | .strategy = &sysctl_jiffies, |
2452 | }, | |
2453 | { | |
2454 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2455 | .procname = "gc_interval", | |
4990509f | 2456 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2457 | .maxlen = sizeof(int), |
2458 | .mode = 0644, | |
1ab1457c | 2459 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2460 | .strategy = &sysctl_jiffies, |
2461 | }, | |
2462 | { | |
2463 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2464 | .procname = "gc_elasticity", | |
4990509f | 2465 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2466 | .maxlen = sizeof(int), |
2467 | .mode = 0644, | |
1ab1457c | 2468 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2469 | .strategy = &sysctl_jiffies, |
2470 | }, | |
2471 | { | |
2472 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2473 | .procname = "mtu_expires", | |
4990509f | 2474 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2475 | .maxlen = sizeof(int), |
2476 | .mode = 0644, | |
1ab1457c | 2477 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2478 | .strategy = &sysctl_jiffies, |
2479 | }, | |
2480 | { | |
2481 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2482 | .procname = "min_adv_mss", | |
4990509f | 2483 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2484 | .maxlen = sizeof(int), |
2485 | .mode = 0644, | |
1ab1457c | 2486 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2487 | .strategy = &sysctl_jiffies, |
2488 | }, | |
2489 | { | |
2490 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2491 | .procname = "gc_min_interval_ms", | |
4990509f | 2492 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2493 | .maxlen = sizeof(int), |
2494 | .mode = 0644, | |
1ab1457c | 2495 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2496 | .strategy = &sysctl_ms_jiffies, |
2497 | }, | |
2498 | { .ctl_name = 0 } | |
2499 | }; | |
2500 | ||
760f2d01 DL |
2501 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2502 | { | |
2503 | struct ctl_table *table; | |
2504 | ||
2505 | table = kmemdup(ipv6_route_table_template, | |
2506 | sizeof(ipv6_route_table_template), | |
2507 | GFP_KERNEL); | |
5ee09105 YH |
2508 | |
2509 | if (table) { | |
2510 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
2511 | /* table[1].data will be handled when we have | |
2512 | routes per namespace */ | |
2513 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; | |
2514 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2515 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2516 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2517 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2518 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2519 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2520 | } | |
2521 | ||
760f2d01 DL |
2522 | return table; |
2523 | } | |
1da177e4 LT |
2524 | #endif |
2525 | ||
433d49c3 | 2526 | int __init ip6_route_init(void) |
1da177e4 | 2527 | { |
433d49c3 DL |
2528 | int ret; |
2529 | ||
e5d679f3 AD |
2530 | ip6_dst_ops.kmem_cachep = |
2531 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
f845ab6b DL |
2532 | SLAB_HWCACHE_ALIGN, NULL); |
2533 | if (!ip6_dst_ops.kmem_cachep) | |
2534 | return -ENOMEM; | |
2535 | ||
14e50e57 DM |
2536 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2537 | ||
433d49c3 DL |
2538 | ret = fib6_init(); |
2539 | if (ret) | |
2540 | goto out_kmem_cache; | |
2541 | ||
75314fb3 DL |
2542 | ret = ipv6_route_proc_init(&init_net); |
2543 | if (ret) | |
433d49c3 DL |
2544 | goto out_fib6_init; |
2545 | ||
433d49c3 DL |
2546 | ret = xfrm6_init(); |
2547 | if (ret) | |
75314fb3 | 2548 | goto out_proc_init; |
c35b7e72 | 2549 | |
433d49c3 DL |
2550 | ret = fib6_rules_init(); |
2551 | if (ret) | |
2552 | goto xfrm6_init; | |
7e5449c2 | 2553 | |
433d49c3 DL |
2554 | ret = -ENOBUFS; |
2555 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2556 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2557 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2558 | goto fib6_rules_init; | |
c127ea2c | 2559 | |
433d49c3 DL |
2560 | ret = 0; |
2561 | out: | |
2562 | return ret; | |
2563 | ||
2564 | fib6_rules_init: | |
433d49c3 DL |
2565 | fib6_rules_cleanup(); |
2566 | xfrm6_init: | |
433d49c3 | 2567 | xfrm6_fini(); |
75314fb3 DL |
2568 | out_proc_init: |
2569 | ipv6_route_proc_fini(&init_net); | |
433d49c3 | 2570 | out_fib6_init: |
433d49c3 DL |
2571 | rt6_ifdown(NULL); |
2572 | fib6_gc_cleanup(); | |
2573 | out_kmem_cache: | |
2574 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2575 | goto out; | |
1da177e4 LT |
2576 | } |
2577 | ||
2578 | void ip6_route_cleanup(void) | |
2579 | { | |
101367c2 | 2580 | fib6_rules_cleanup(); |
75314fb3 | 2581 | ipv6_route_proc_fini(&init_net); |
1da177e4 | 2582 | xfrm6_fini(); |
1da177e4 LT |
2583 | rt6_ifdown(NULL); |
2584 | fib6_gc_cleanup(); | |
2585 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2586 | } |