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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 LT |
75 | |
76 | static int ip6_rt_max_size = 4096; | |
77 | static int ip6_rt_gc_min_interval = HZ / 2; | |
78 | static int ip6_rt_gc_timeout = 60*HZ; | |
79 | int ip6_rt_gc_interval = 30*HZ; | |
80 | static int ip6_rt_gc_elasticity = 9; | |
81 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
82 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
83 | ||
84 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
85 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
86 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
87 | static void ip6_dst_destroy(struct dst_entry *); | |
88 | static void ip6_dst_ifdown(struct dst_entry *, | |
89 | struct net_device *dev, int how); | |
90 | static int ip6_dst_gc(void); | |
91 | ||
92 | static int ip6_pkt_discard(struct sk_buff *skb); | |
93 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
94 | static void ip6_link_failure(struct sk_buff *skb); | |
95 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
96 | ||
70ceb4f5 YH |
97 | #ifdef CONFIG_IPV6_ROUTE_INFO |
98 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
99 | struct in6_addr *gwaddr, int ifindex, | |
100 | unsigned pref); | |
101 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
102 | struct in6_addr *gwaddr, int ifindex); | |
103 | #endif | |
104 | ||
1da177e4 LT |
105 | static struct dst_ops ip6_dst_ops = { |
106 | .family = AF_INET6, | |
107 | .protocol = __constant_htons(ETH_P_IPV6), | |
108 | .gc = ip6_dst_gc, | |
109 | .gc_thresh = 1024, | |
110 | .check = ip6_dst_check, | |
111 | .destroy = ip6_dst_destroy, | |
112 | .ifdown = ip6_dst_ifdown, | |
113 | .negative_advice = ip6_negative_advice, | |
114 | .link_failure = ip6_link_failure, | |
115 | .update_pmtu = ip6_rt_update_pmtu, | |
862b82c6 | 116 | .local_out = ip6_local_out, |
1da177e4 LT |
117 | .entry_size = sizeof(struct rt6_info), |
118 | }; | |
119 | ||
14e50e57 DM |
120 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
121 | { | |
122 | } | |
123 | ||
124 | static struct dst_ops ip6_dst_blackhole_ops = { | |
125 | .family = AF_INET6, | |
126 | .protocol = __constant_htons(ETH_P_IPV6), | |
127 | .destroy = ip6_dst_destroy, | |
128 | .check = ip6_dst_check, | |
129 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
130 | .entry_size = sizeof(struct rt6_info), | |
131 | }; | |
132 | ||
1da177e4 LT |
133 | struct rt6_info ip6_null_entry = { |
134 | .u = { | |
135 | .dst = { | |
136 | .__refcnt = ATOMIC_INIT(1), | |
137 | .__use = 1, | |
1da177e4 LT |
138 | .obsolete = -1, |
139 | .error = -ENETUNREACH, | |
140 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
141 | .input = ip6_pkt_discard, | |
142 | .output = ip6_pkt_discard_out, | |
143 | .ops = &ip6_dst_ops, | |
144 | .path = (struct dst_entry*)&ip6_null_entry, | |
145 | } | |
146 | }, | |
147 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
148 | .rt6i_metric = ~(u32) 0, | |
149 | .rt6i_ref = ATOMIC_INIT(1), | |
150 | }; | |
151 | ||
101367c2 TG |
152 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
153 | ||
6723ab54 DM |
154 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
155 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 156 | |
101367c2 TG |
157 | struct rt6_info ip6_prohibit_entry = { |
158 | .u = { | |
159 | .dst = { | |
160 | .__refcnt = ATOMIC_INIT(1), | |
161 | .__use = 1, | |
101367c2 TG |
162 | .obsolete = -1, |
163 | .error = -EACCES, | |
164 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
165 | .input = ip6_pkt_prohibit, |
166 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
167 | .ops = &ip6_dst_ops, |
168 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
169 | } | |
170 | }, | |
171 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
172 | .rt6i_metric = ~(u32) 0, | |
173 | .rt6i_ref = ATOMIC_INIT(1), | |
174 | }; | |
175 | ||
176 | struct rt6_info ip6_blk_hole_entry = { | |
177 | .u = { | |
178 | .dst = { | |
179 | .__refcnt = ATOMIC_INIT(1), | |
180 | .__use = 1, | |
101367c2 TG |
181 | .obsolete = -1, |
182 | .error = -EINVAL, | |
183 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
184 | .input = dst_discard, |
185 | .output = dst_discard, | |
101367c2 TG |
186 | .ops = &ip6_dst_ops, |
187 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
188 | } | |
189 | }, | |
190 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
191 | .rt6i_metric = ~(u32) 0, | |
192 | .rt6i_ref = ATOMIC_INIT(1), | |
193 | }; | |
194 | ||
195 | #endif | |
196 | ||
1da177e4 LT |
197 | /* allocate dst with ip6_dst_ops */ |
198 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
199 | { | |
200 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
201 | } | |
202 | ||
203 | static void ip6_dst_destroy(struct dst_entry *dst) | |
204 | { | |
205 | struct rt6_info *rt = (struct rt6_info *)dst; | |
206 | struct inet6_dev *idev = rt->rt6i_idev; | |
207 | ||
208 | if (idev != NULL) { | |
209 | rt->rt6i_idev = NULL; | |
210 | in6_dev_put(idev); | |
1ab1457c | 211 | } |
1da177e4 LT |
212 | } |
213 | ||
214 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
215 | int how) | |
216 | { | |
217 | struct rt6_info *rt = (struct rt6_info *)dst; | |
218 | struct inet6_dev *idev = rt->rt6i_idev; | |
219 | ||
2774c7ab EB |
220 | if (dev != init_net.loopback_dev && idev != NULL && idev->dev == dev) { |
221 | struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev); | |
1da177e4 LT |
222 | if (loopback_idev != NULL) { |
223 | rt->rt6i_idev = loopback_idev; | |
224 | in6_dev_put(idev); | |
225 | } | |
226 | } | |
227 | } | |
228 | ||
229 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
230 | { | |
231 | return (rt->rt6i_flags & RTF_EXPIRES && | |
232 | time_after(jiffies, rt->rt6i_expires)); | |
233 | } | |
234 | ||
c71099ac TG |
235 | static inline int rt6_need_strict(struct in6_addr *daddr) |
236 | { | |
237 | return (ipv6_addr_type(daddr) & | |
238 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
239 | } | |
240 | ||
1da177e4 | 241 | /* |
c71099ac | 242 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
243 | */ |
244 | ||
245 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
246 | int oif, | |
247 | int strict) | |
248 | { | |
249 | struct rt6_info *local = NULL; | |
250 | struct rt6_info *sprt; | |
251 | ||
252 | if (oif) { | |
7cc48263 | 253 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
254 | struct net_device *dev = sprt->rt6i_dev; |
255 | if (dev->ifindex == oif) | |
256 | return sprt; | |
257 | if (dev->flags & IFF_LOOPBACK) { | |
258 | if (sprt->rt6i_idev == NULL || | |
259 | sprt->rt6i_idev->dev->ifindex != oif) { | |
260 | if (strict && oif) | |
261 | continue; | |
1ab1457c | 262 | if (local && (!oif || |
1da177e4 LT |
263 | local->rt6i_idev->dev->ifindex == oif)) |
264 | continue; | |
265 | } | |
266 | local = sprt; | |
267 | } | |
268 | } | |
269 | ||
270 | if (local) | |
271 | return local; | |
272 | ||
273 | if (strict) | |
274 | return &ip6_null_entry; | |
275 | } | |
276 | return rt; | |
277 | } | |
278 | ||
27097255 YH |
279 | #ifdef CONFIG_IPV6_ROUTER_PREF |
280 | static void rt6_probe(struct rt6_info *rt) | |
281 | { | |
282 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
283 | /* | |
284 | * Okay, this does not seem to be appropriate | |
285 | * for now, however, we need to check if it | |
286 | * is really so; aka Router Reachability Probing. | |
287 | * | |
288 | * Router Reachability Probe MUST be rate-limited | |
289 | * to no more than one per minute. | |
290 | */ | |
291 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
292 | return; | |
293 | read_lock_bh(&neigh->lock); | |
294 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 295 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
296 | struct in6_addr mcaddr; |
297 | struct in6_addr *target; | |
298 | ||
299 | neigh->updated = jiffies; | |
300 | read_unlock_bh(&neigh->lock); | |
301 | ||
302 | target = (struct in6_addr *)&neigh->primary_key; | |
303 | addrconf_addr_solict_mult(target, &mcaddr); | |
304 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
305 | } else | |
306 | read_unlock_bh(&neigh->lock); | |
307 | } | |
308 | #else | |
309 | static inline void rt6_probe(struct rt6_info *rt) | |
310 | { | |
311 | return; | |
312 | } | |
313 | #endif | |
314 | ||
1da177e4 | 315 | /* |
554cfb7e | 316 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 317 | */ |
b6f99a21 | 318 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
319 | { |
320 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 321 | if (!oif || dev->ifindex == oif) |
554cfb7e | 322 | return 2; |
161980f4 DM |
323 | if ((dev->flags & IFF_LOOPBACK) && |
324 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
325 | return 1; | |
326 | return 0; | |
554cfb7e | 327 | } |
1da177e4 | 328 | |
b6f99a21 | 329 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 330 | { |
554cfb7e | 331 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 332 | int m; |
4d0c5911 YH |
333 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
334 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
335 | m = 1; | |
336 | else if (neigh) { | |
554cfb7e YH |
337 | read_lock_bh(&neigh->lock); |
338 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 339 | m = 2; |
398bcbeb YH |
340 | #ifdef CONFIG_IPV6_ROUTER_PREF |
341 | else if (neigh->nud_state & NUD_FAILED) | |
342 | m = 0; | |
343 | #endif | |
344 | else | |
ea73ee23 | 345 | m = 1; |
554cfb7e | 346 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
347 | } else |
348 | m = 0; | |
554cfb7e | 349 | return m; |
1da177e4 LT |
350 | } |
351 | ||
554cfb7e YH |
352 | static int rt6_score_route(struct rt6_info *rt, int oif, |
353 | int strict) | |
1da177e4 | 354 | { |
4d0c5911 | 355 | int m, n; |
1ab1457c | 356 | |
4d0c5911 | 357 | m = rt6_check_dev(rt, oif); |
77d16f45 | 358 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 359 | return -1; |
ebacaaa0 YH |
360 | #ifdef CONFIG_IPV6_ROUTER_PREF |
361 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
362 | #endif | |
4d0c5911 | 363 | n = rt6_check_neigh(rt); |
557e92ef | 364 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
365 | return -1; |
366 | return m; | |
367 | } | |
368 | ||
f11e6659 DM |
369 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
370 | int *mpri, struct rt6_info *match) | |
554cfb7e | 371 | { |
f11e6659 DM |
372 | int m; |
373 | ||
374 | if (rt6_check_expired(rt)) | |
375 | goto out; | |
376 | ||
377 | m = rt6_score_route(rt, oif, strict); | |
378 | if (m < 0) | |
379 | goto out; | |
380 | ||
381 | if (m > *mpri) { | |
382 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
383 | rt6_probe(match); | |
384 | *mpri = m; | |
385 | match = rt; | |
386 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
387 | rt6_probe(rt); | |
388 | } | |
389 | ||
390 | out: | |
391 | return match; | |
392 | } | |
393 | ||
394 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
395 | struct rt6_info *rr_head, | |
396 | u32 metric, int oif, int strict) | |
397 | { | |
398 | struct rt6_info *rt, *match; | |
554cfb7e | 399 | int mpri = -1; |
1da177e4 | 400 | |
f11e6659 DM |
401 | match = NULL; |
402 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
403 | rt = rt->u.dst.rt6_next) | |
404 | match = find_match(rt, oif, strict, &mpri, match); | |
405 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
406 | rt = rt->u.dst.rt6_next) | |
407 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 408 | |
f11e6659 DM |
409 | return match; |
410 | } | |
1da177e4 | 411 | |
f11e6659 DM |
412 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
413 | { | |
414 | struct rt6_info *match, *rt0; | |
1da177e4 | 415 | |
f11e6659 DM |
416 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
417 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 418 | |
f11e6659 DM |
419 | rt0 = fn->rr_ptr; |
420 | if (!rt0) | |
421 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 422 | |
f11e6659 | 423 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 424 | |
554cfb7e | 425 | if (!match && |
f11e6659 DM |
426 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
427 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
428 | ||
554cfb7e | 429 | /* no entries matched; do round-robin */ |
f11e6659 DM |
430 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
431 | next = fn->leaf; | |
432 | ||
433 | if (next != rt0) | |
434 | fn->rr_ptr = next; | |
1da177e4 | 435 | } |
1da177e4 | 436 | |
f11e6659 DM |
437 | RT6_TRACE("%s() => %p\n", |
438 | __FUNCTION__, match); | |
1da177e4 | 439 | |
554cfb7e | 440 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
441 | } |
442 | ||
70ceb4f5 YH |
443 | #ifdef CONFIG_IPV6_ROUTE_INFO |
444 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
445 | struct in6_addr *gwaddr) | |
446 | { | |
447 | struct route_info *rinfo = (struct route_info *) opt; | |
448 | struct in6_addr prefix_buf, *prefix; | |
449 | unsigned int pref; | |
450 | u32 lifetime; | |
451 | struct rt6_info *rt; | |
452 | ||
453 | if (len < sizeof(struct route_info)) { | |
454 | return -EINVAL; | |
455 | } | |
456 | ||
457 | /* Sanity check for prefix_len and length */ | |
458 | if (rinfo->length > 3) { | |
459 | return -EINVAL; | |
460 | } else if (rinfo->prefix_len > 128) { | |
461 | return -EINVAL; | |
462 | } else if (rinfo->prefix_len > 64) { | |
463 | if (rinfo->length < 2) { | |
464 | return -EINVAL; | |
465 | } | |
466 | } else if (rinfo->prefix_len > 0) { | |
467 | if (rinfo->length < 1) { | |
468 | return -EINVAL; | |
469 | } | |
470 | } | |
471 | ||
472 | pref = rinfo->route_pref; | |
473 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
474 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
475 | ||
e69a4adc | 476 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
477 | if (lifetime == 0xffffffff) { |
478 | /* infinity */ | |
479 | } else if (lifetime > 0x7fffffff/HZ) { | |
480 | /* Avoid arithmetic overflow */ | |
481 | lifetime = 0x7fffffff/HZ - 1; | |
482 | } | |
483 | ||
484 | if (rinfo->length == 3) | |
485 | prefix = (struct in6_addr *)rinfo->prefix; | |
486 | else { | |
487 | /* this function is safe */ | |
488 | ipv6_addr_prefix(&prefix_buf, | |
489 | (struct in6_addr *)rinfo->prefix, | |
490 | rinfo->prefix_len); | |
491 | prefix = &prefix_buf; | |
492 | } | |
493 | ||
494 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
495 | ||
496 | if (rt && !lifetime) { | |
e0a1ad73 | 497 | ip6_del_rt(rt); |
70ceb4f5 YH |
498 | rt = NULL; |
499 | } | |
500 | ||
501 | if (!rt && lifetime) | |
502 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
503 | pref); | |
504 | else if (rt) | |
505 | rt->rt6i_flags = RTF_ROUTEINFO | | |
506 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
507 | ||
508 | if (rt) { | |
509 | if (lifetime == 0xffffffff) { | |
510 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
511 | } else { | |
512 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
513 | rt->rt6i_flags |= RTF_EXPIRES; | |
514 | } | |
515 | dst_release(&rt->u.dst); | |
516 | } | |
517 | return 0; | |
518 | } | |
519 | #endif | |
520 | ||
982f56f3 YH |
521 | #define BACKTRACK(saddr) \ |
522 | do { \ | |
523 | if (rt == &ip6_null_entry) { \ | |
524 | struct fib6_node *pn; \ | |
e0eda7bb | 525 | while (1) { \ |
982f56f3 YH |
526 | if (fn->fn_flags & RTN_TL_ROOT) \ |
527 | goto out; \ | |
528 | pn = fn->parent; \ | |
529 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 530 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
531 | else \ |
532 | fn = pn; \ | |
533 | if (fn->fn_flags & RTN_RTINFO) \ | |
534 | goto restart; \ | |
c71099ac | 535 | } \ |
c71099ac | 536 | } \ |
982f56f3 | 537 | } while(0) |
c71099ac TG |
538 | |
539 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
540 | struct flowi *fl, int flags) | |
1da177e4 LT |
541 | { |
542 | struct fib6_node *fn; | |
543 | struct rt6_info *rt; | |
544 | ||
c71099ac TG |
545 | read_lock_bh(&table->tb6_lock); |
546 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
547 | restart: | |
548 | rt = fn->leaf; | |
77d16f45 | 549 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 550 | BACKTRACK(&fl->fl6_src); |
c71099ac | 551 | out: |
03f49f34 | 552 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 553 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
554 | return rt; |
555 | ||
556 | } | |
557 | ||
558 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
559 | int oif, int strict) | |
560 | { | |
561 | struct flowi fl = { | |
562 | .oif = oif, | |
563 | .nl_u = { | |
564 | .ip6_u = { | |
565 | .daddr = *daddr, | |
c71099ac TG |
566 | }, |
567 | }, | |
568 | }; | |
569 | struct dst_entry *dst; | |
77d16f45 | 570 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 571 | |
adaa70bb TG |
572 | if (saddr) { |
573 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
574 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
575 | } | |
576 | ||
c71099ac TG |
577 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
578 | if (dst->error == 0) | |
579 | return (struct rt6_info *) dst; | |
580 | ||
581 | dst_release(dst); | |
582 | ||
1da177e4 LT |
583 | return NULL; |
584 | } | |
585 | ||
7159039a YH |
586 | EXPORT_SYMBOL(rt6_lookup); |
587 | ||
c71099ac | 588 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
589 | It takes new route entry, the addition fails by any reason the |
590 | route is freed. In any case, if caller does not hold it, it may | |
591 | be destroyed. | |
592 | */ | |
593 | ||
86872cb5 | 594 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
595 | { |
596 | int err; | |
c71099ac | 597 | struct fib6_table *table; |
1da177e4 | 598 | |
c71099ac TG |
599 | table = rt->rt6i_table; |
600 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 601 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 602 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
603 | |
604 | return err; | |
605 | } | |
606 | ||
40e22e8f TG |
607 | int ip6_ins_rt(struct rt6_info *rt) |
608 | { | |
86872cb5 | 609 | return __ip6_ins_rt(rt, NULL); |
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 | ||
893 | if (mtu < ip6_rt_min_advmss) | |
894 | mtu = ip6_rt_min_advmss; | |
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 | ||
5d0bbeeb | 907 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 908 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 909 | |
1ab1457c | 910 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
1da177e4 LT |
911 | struct neighbour *neigh, |
912 | struct in6_addr *addr, | |
913 | int (*output)(struct sk_buff *)) | |
914 | { | |
915 | struct rt6_info *rt; | |
916 | struct inet6_dev *idev = in6_dev_get(dev); | |
917 | ||
918 | if (unlikely(idev == NULL)) | |
919 | return NULL; | |
920 | ||
921 | rt = ip6_dst_alloc(); | |
922 | if (unlikely(rt == NULL)) { | |
923 | in6_dev_put(idev); | |
924 | goto out; | |
925 | } | |
926 | ||
927 | dev_hold(dev); | |
928 | if (neigh) | |
929 | neigh_hold(neigh); | |
930 | else | |
931 | neigh = ndisc_get_neigh(dev, addr); | |
932 | ||
933 | rt->rt6i_dev = dev; | |
934 | rt->rt6i_idev = idev; | |
935 | rt->rt6i_nexthop = neigh; | |
936 | atomic_set(&rt->u.dst.__refcnt, 1); | |
937 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
938 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
939 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
940 | rt->u.dst.output = output; | |
941 | ||
942 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
943 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
944 | ? DST_HOST | |
1da177e4 LT |
945 | : 0; |
946 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
947 | rt->rt6i_dst.plen = 128; | |
948 | #endif | |
949 | ||
5d0bbeeb | 950 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
951 | rt->u.dst.next = ndisc_dst_gc_list; |
952 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 953 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
954 | |
955 | fib6_force_start_gc(); | |
956 | ||
957 | out: | |
40aa7b90 | 958 | return &rt->u.dst; |
1da177e4 LT |
959 | } |
960 | ||
961 | int ndisc_dst_gc(int *more) | |
962 | { | |
963 | struct dst_entry *dst, *next, **pprev; | |
964 | int freed; | |
965 | ||
966 | next = NULL; | |
1ab1457c | 967 | freed = 0; |
5d0bbeeb TG |
968 | |
969 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 970 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 971 | |
1da177e4 LT |
972 | while ((dst = *pprev) != NULL) { |
973 | if (!atomic_read(&dst->__refcnt)) { | |
974 | *pprev = dst->next; | |
975 | dst_free(dst); | |
976 | freed++; | |
977 | } else { | |
978 | pprev = &dst->next; | |
979 | (*more)++; | |
980 | } | |
981 | } | |
982 | ||
5d0bbeeb TG |
983 | spin_unlock_bh(&ndisc_lock); |
984 | ||
1da177e4 LT |
985 | return freed; |
986 | } | |
987 | ||
988 | static int ip6_dst_gc(void) | |
989 | { | |
990 | static unsigned expire = 30*HZ; | |
991 | static unsigned long last_gc; | |
992 | unsigned long now = jiffies; | |
993 | ||
994 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
995 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
996 | goto out; | |
997 | ||
998 | expire++; | |
999 | fib6_run_gc(expire); | |
1000 | last_gc = now; | |
1001 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
1002 | expire = ip6_rt_gc_timeout>>1; | |
1003 | ||
1004 | out: | |
1005 | expire -= expire>>ip6_rt_gc_elasticity; | |
1006 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
1007 | } | |
1008 | ||
1009 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1010 | but results in cleaner routing tables. | |
1011 | ||
1012 | Remove it only when all the things will work! | |
1013 | */ | |
1014 | ||
1015 | static int ipv6_get_mtu(struct net_device *dev) | |
1016 | { | |
1017 | int mtu = IPV6_MIN_MTU; | |
1018 | struct inet6_dev *idev; | |
1019 | ||
1020 | idev = in6_dev_get(dev); | |
1021 | if (idev) { | |
1022 | mtu = idev->cnf.mtu6; | |
1023 | in6_dev_put(idev); | |
1024 | } | |
1025 | return mtu; | |
1026 | } | |
1027 | ||
1028 | int ipv6_get_hoplimit(struct net_device *dev) | |
1029 | { | |
1030 | int hoplimit = ipv6_devconf.hop_limit; | |
1031 | struct inet6_dev *idev; | |
1032 | ||
1033 | idev = in6_dev_get(dev); | |
1034 | if (idev) { | |
1035 | hoplimit = idev->cnf.hop_limit; | |
1036 | in6_dev_put(idev); | |
1037 | } | |
1038 | return hoplimit; | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * | |
1043 | */ | |
1044 | ||
86872cb5 | 1045 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1046 | { |
1047 | int err; | |
1da177e4 LT |
1048 | struct rt6_info *rt = NULL; |
1049 | struct net_device *dev = NULL; | |
1050 | struct inet6_dev *idev = NULL; | |
c71099ac | 1051 | struct fib6_table *table; |
1da177e4 LT |
1052 | int addr_type; |
1053 | ||
86872cb5 | 1054 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1055 | return -EINVAL; |
1056 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1057 | if (cfg->fc_src_len) |
1da177e4 LT |
1058 | return -EINVAL; |
1059 | #endif | |
86872cb5 | 1060 | if (cfg->fc_ifindex) { |
1da177e4 | 1061 | err = -ENODEV; |
881d966b | 1062 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
1da177e4 LT |
1063 | if (!dev) |
1064 | goto out; | |
1065 | idev = in6_dev_get(dev); | |
1066 | if (!idev) | |
1067 | goto out; | |
1068 | } | |
1069 | ||
86872cb5 TG |
1070 | if (cfg->fc_metric == 0) |
1071 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1072 | |
86872cb5 | 1073 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1074 | if (table == NULL) { |
1075 | err = -ENOBUFS; | |
1076 | goto out; | |
1077 | } | |
1078 | ||
1da177e4 LT |
1079 | rt = ip6_dst_alloc(); |
1080 | ||
1081 | if (rt == NULL) { | |
1082 | err = -ENOMEM; | |
1083 | goto out; | |
1084 | } | |
1085 | ||
1086 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1087 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1088 | |
86872cb5 TG |
1089 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1090 | cfg->fc_protocol = RTPROT_BOOT; | |
1091 | rt->rt6i_protocol = cfg->fc_protocol; | |
1092 | ||
1093 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1094 | |
1095 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1096 | rt->u.dst.input = ip6_mc_input; | |
1097 | else | |
1098 | rt->u.dst.input = ip6_forward; | |
1099 | ||
1100 | rt->u.dst.output = ip6_output; | |
1101 | ||
86872cb5 TG |
1102 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1103 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1104 | if (rt->rt6i_dst.plen == 128) |
1105 | rt->u.dst.flags = DST_HOST; | |
1106 | ||
1107 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1108 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1109 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1110 | #endif |
1111 | ||
86872cb5 | 1112 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1113 | |
1114 | /* We cannot add true routes via loopback here, | |
1115 | they would result in kernel looping; promote them to reject routes | |
1116 | */ | |
86872cb5 | 1117 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1118 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1119 | /* hold loopback dev/idev if we haven't done so. */ | |
2774c7ab | 1120 | if (dev != init_net.loopback_dev) { |
1da177e4 LT |
1121 | if (dev) { |
1122 | dev_put(dev); | |
1123 | in6_dev_put(idev); | |
1124 | } | |
2774c7ab | 1125 | dev = init_net.loopback_dev; |
1da177e4 LT |
1126 | dev_hold(dev); |
1127 | idev = in6_dev_get(dev); | |
1128 | if (!idev) { | |
1129 | err = -ENODEV; | |
1130 | goto out; | |
1131 | } | |
1132 | } | |
1133 | rt->u.dst.output = ip6_pkt_discard_out; | |
1134 | rt->u.dst.input = ip6_pkt_discard; | |
1135 | rt->u.dst.error = -ENETUNREACH; | |
1136 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1137 | goto install_route; | |
1138 | } | |
1139 | ||
86872cb5 | 1140 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1141 | struct in6_addr *gw_addr; |
1142 | int gwa_type; | |
1143 | ||
86872cb5 TG |
1144 | gw_addr = &cfg->fc_gateway; |
1145 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1146 | gwa_type = ipv6_addr_type(gw_addr); |
1147 | ||
1148 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1149 | struct rt6_info *grt; | |
1150 | ||
1151 | /* IPv6 strictly inhibits using not link-local | |
1152 | addresses as nexthop address. | |
1153 | Otherwise, router will not able to send redirects. | |
1154 | It is very good, but in some (rare!) circumstances | |
1155 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1156 | some exceptions. --ANK | |
1157 | */ | |
1158 | err = -EINVAL; | |
1159 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1160 | goto out; | |
1161 | ||
86872cb5 | 1162 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1163 | |
1164 | err = -EHOSTUNREACH; | |
1165 | if (grt == NULL) | |
1166 | goto out; | |
1167 | if (dev) { | |
1168 | if (dev != grt->rt6i_dev) { | |
1169 | dst_release(&grt->u.dst); | |
1170 | goto out; | |
1171 | } | |
1172 | } else { | |
1173 | dev = grt->rt6i_dev; | |
1174 | idev = grt->rt6i_idev; | |
1175 | dev_hold(dev); | |
1176 | in6_dev_hold(grt->rt6i_idev); | |
1177 | } | |
1178 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1179 | err = 0; | |
1180 | dst_release(&grt->u.dst); | |
1181 | ||
1182 | if (err) | |
1183 | goto out; | |
1184 | } | |
1185 | err = -EINVAL; | |
1186 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1187 | goto out; | |
1188 | } | |
1189 | ||
1190 | err = -ENODEV; | |
1191 | if (dev == NULL) | |
1192 | goto out; | |
1193 | ||
86872cb5 | 1194 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1195 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1196 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1197 | err = PTR_ERR(rt->rt6i_nexthop); | |
1198 | rt->rt6i_nexthop = NULL; | |
1199 | goto out; | |
1200 | } | |
1201 | } | |
1202 | ||
86872cb5 | 1203 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1204 | |
1205 | install_route: | |
86872cb5 TG |
1206 | if (cfg->fc_mx) { |
1207 | struct nlattr *nla; | |
1208 | int remaining; | |
1209 | ||
1210 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1211 | int type = nla_type(nla); |
86872cb5 TG |
1212 | |
1213 | if (type) { | |
1214 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1215 | err = -EINVAL; |
1216 | goto out; | |
1217 | } | |
86872cb5 TG |
1218 | |
1219 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1220 | } |
1da177e4 LT |
1221 | } |
1222 | } | |
1223 | ||
1224 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1225 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1226 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1227 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1228 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1229 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1230 | rt->u.dst.dev = dev; | |
1231 | rt->rt6i_idev = idev; | |
c71099ac | 1232 | rt->rt6i_table = table; |
86872cb5 | 1233 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1234 | |
1235 | out: | |
1236 | if (dev) | |
1237 | dev_put(dev); | |
1238 | if (idev) | |
1239 | in6_dev_put(idev); | |
1240 | if (rt) | |
40aa7b90 | 1241 | dst_free(&rt->u.dst); |
1da177e4 LT |
1242 | return err; |
1243 | } | |
1244 | ||
86872cb5 | 1245 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1246 | { |
1247 | int err; | |
c71099ac | 1248 | struct fib6_table *table; |
1da177e4 | 1249 | |
6c813a72 PM |
1250 | if (rt == &ip6_null_entry) |
1251 | return -ENOENT; | |
1252 | ||
c71099ac TG |
1253 | table = rt->rt6i_table; |
1254 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1255 | |
86872cb5 | 1256 | err = fib6_del(rt, info); |
1da177e4 LT |
1257 | dst_release(&rt->u.dst); |
1258 | ||
c71099ac | 1259 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1260 | |
1261 | return err; | |
1262 | } | |
1263 | ||
e0a1ad73 TG |
1264 | int ip6_del_rt(struct rt6_info *rt) |
1265 | { | |
86872cb5 | 1266 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1267 | } |
1268 | ||
86872cb5 | 1269 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1270 | { |
c71099ac | 1271 | struct fib6_table *table; |
1da177e4 LT |
1272 | struct fib6_node *fn; |
1273 | struct rt6_info *rt; | |
1274 | int err = -ESRCH; | |
1275 | ||
86872cb5 | 1276 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1277 | if (table == NULL) |
1278 | return err; | |
1279 | ||
1280 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1281 | |
c71099ac | 1282 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1283 | &cfg->fc_dst, cfg->fc_dst_len, |
1284 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1285 | |
1da177e4 | 1286 | if (fn) { |
7cc48263 | 1287 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1288 | if (cfg->fc_ifindex && |
1da177e4 | 1289 | (rt->rt6i_dev == NULL || |
86872cb5 | 1290 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1291 | continue; |
86872cb5 TG |
1292 | if (cfg->fc_flags & RTF_GATEWAY && |
1293 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1294 | continue; |
86872cb5 | 1295 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1296 | continue; |
1297 | dst_hold(&rt->u.dst); | |
c71099ac | 1298 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1299 | |
86872cb5 | 1300 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1301 | } |
1302 | } | |
c71099ac | 1303 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1304 | |
1305 | return err; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * Handle redirects | |
1310 | */ | |
a6279458 YH |
1311 | struct ip6rd_flowi { |
1312 | struct flowi fl; | |
1313 | struct in6_addr gateway; | |
1314 | }; | |
1315 | ||
1316 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1317 | struct flowi *fl, | |
1318 | int flags) | |
1da177e4 | 1319 | { |
a6279458 YH |
1320 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1321 | struct rt6_info *rt; | |
e843b9e1 | 1322 | struct fib6_node *fn; |
c71099ac | 1323 | |
1da177e4 | 1324 | /* |
e843b9e1 YH |
1325 | * Get the "current" route for this destination and |
1326 | * check if the redirect has come from approriate router. | |
1327 | * | |
1328 | * RFC 2461 specifies that redirects should only be | |
1329 | * accepted if they come from the nexthop to the target. | |
1330 | * Due to the way the routes are chosen, this notion | |
1331 | * is a bit fuzzy and one might need to check all possible | |
1332 | * routes. | |
1da177e4 | 1333 | */ |
1da177e4 | 1334 | |
c71099ac | 1335 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1336 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1337 | restart: |
7cc48263 | 1338 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1339 | /* |
1340 | * Current route is on-link; redirect is always invalid. | |
1341 | * | |
1342 | * Seems, previous statement is not true. It could | |
1343 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1344 | * But then router serving it might decide, that we should | |
1345 | * know truth 8)8) --ANK (980726). | |
1346 | */ | |
1347 | if (rt6_check_expired(rt)) | |
1348 | continue; | |
1349 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1350 | continue; | |
a6279458 | 1351 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1352 | continue; |
a6279458 | 1353 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1354 | continue; |
1355 | break; | |
1356 | } | |
a6279458 | 1357 | |
cb15d9c2 | 1358 | if (!rt) |
a6279458 | 1359 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1360 | BACKTRACK(&fl->fl6_src); |
1361 | out: | |
a6279458 YH |
1362 | dst_hold(&rt->u.dst); |
1363 | ||
c71099ac | 1364 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1365 | |
a6279458 YH |
1366 | return rt; |
1367 | }; | |
1368 | ||
1369 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1370 | struct in6_addr *src, | |
1371 | struct in6_addr *gateway, | |
1372 | struct net_device *dev) | |
1373 | { | |
adaa70bb | 1374 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1375 | struct ip6rd_flowi rdfl = { |
1376 | .fl = { | |
1377 | .oif = dev->ifindex, | |
1378 | .nl_u = { | |
1379 | .ip6_u = { | |
1380 | .daddr = *dest, | |
1381 | .saddr = *src, | |
1382 | }, | |
1383 | }, | |
1384 | }, | |
1385 | .gateway = *gateway, | |
1386 | }; | |
adaa70bb TG |
1387 | |
1388 | if (rt6_need_strict(dest)) | |
1389 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1390 | |
1391 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1392 | } | |
1393 | ||
1394 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1395 | struct in6_addr *saddr, | |
1396 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1397 | { | |
1398 | struct rt6_info *rt, *nrt = NULL; | |
1399 | struct netevent_redirect netevent; | |
1400 | ||
1401 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1402 | ||
1403 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1404 | if (net_ratelimit()) |
1405 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1406 | "for redirect target\n"); | |
a6279458 | 1407 | goto out; |
1da177e4 LT |
1408 | } |
1409 | ||
1da177e4 LT |
1410 | /* |
1411 | * We have finally decided to accept it. | |
1412 | */ | |
1413 | ||
1ab1457c | 1414 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1415 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1416 | NEIGH_UPDATE_F_OVERRIDE| | |
1417 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1418 | NEIGH_UPDATE_F_ISROUTER)) | |
1419 | ); | |
1420 | ||
1421 | /* | |
1422 | * Redirect received -> path was valid. | |
1423 | * Look, redirects are sent only in response to data packets, | |
1424 | * so that this nexthop apparently is reachable. --ANK | |
1425 | */ | |
1426 | dst_confirm(&rt->u.dst); | |
1427 | ||
1428 | /* Duplicate redirect: silently ignore. */ | |
1429 | if (neigh == rt->u.dst.neighbour) | |
1430 | goto out; | |
1431 | ||
1432 | nrt = ip6_rt_copy(rt); | |
1433 | if (nrt == NULL) | |
1434 | goto out; | |
1435 | ||
1436 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1437 | if (on_link) | |
1438 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1439 | ||
1440 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1441 | nrt->rt6i_dst.plen = 128; | |
1442 | nrt->u.dst.flags |= DST_HOST; | |
1443 | ||
1444 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1445 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1446 | /* Reset pmtu, it may be better */ | |
1447 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1448 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1449 | ||
40e22e8f | 1450 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1451 | goto out; |
1452 | ||
8d71740c TT |
1453 | netevent.old = &rt->u.dst; |
1454 | netevent.new = &nrt->u.dst; | |
1455 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1456 | ||
1da177e4 | 1457 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1458 | ip6_del_rt(rt); |
1da177e4 LT |
1459 | return; |
1460 | } | |
1461 | ||
1462 | out: | |
1ab1457c | 1463 | dst_release(&rt->u.dst); |
1da177e4 LT |
1464 | return; |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * Handle ICMP "packet too big" messages | |
1469 | * i.e. Path MTU discovery | |
1470 | */ | |
1471 | ||
1472 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1473 | struct net_device *dev, u32 pmtu) | |
1474 | { | |
1475 | struct rt6_info *rt, *nrt; | |
1476 | int allfrag = 0; | |
1477 | ||
1478 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1479 | if (rt == NULL) | |
1480 | return; | |
1481 | ||
1482 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1483 | goto out; | |
1484 | ||
1485 | if (pmtu < IPV6_MIN_MTU) { | |
1486 | /* | |
1ab1457c | 1487 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1488 | * MTU (1280) and a fragment header should always be included |
1489 | * after a node receiving Too Big message reporting PMTU is | |
1490 | * less than the IPv6 Minimum Link MTU. | |
1491 | */ | |
1492 | pmtu = IPV6_MIN_MTU; | |
1493 | allfrag = 1; | |
1494 | } | |
1495 | ||
1496 | /* New mtu received -> path was valid. | |
1497 | They are sent only in response to data packets, | |
1498 | so that this nexthop apparently is reachable. --ANK | |
1499 | */ | |
1500 | dst_confirm(&rt->u.dst); | |
1501 | ||
1502 | /* Host route. If it is static, it would be better | |
1503 | not to override it, but add new one, so that | |
1504 | when cache entry will expire old pmtu | |
1505 | would return automatically. | |
1506 | */ | |
1507 | if (rt->rt6i_flags & RTF_CACHE) { | |
1508 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1509 | if (allfrag) | |
1510 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1511 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1512 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1513 | goto out; | |
1514 | } | |
1515 | ||
1516 | /* Network route. | |
1517 | Two cases are possible: | |
1518 | 1. It is connected route. Action: COW | |
1519 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1520 | */ | |
d5315b50 | 1521 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1522 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1523 | else |
1524 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1525 | |
d5315b50 | 1526 | if (nrt) { |
a1e78363 YH |
1527 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1528 | if (allfrag) | |
1529 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1530 | ||
1531 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1532 | * happened within 5 mins, the recommended timer is 10 mins. | |
1533 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1534 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1535 | * and detecting PMTU increase will be automatically happened. | |
1536 | */ | |
1537 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1538 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1539 | ||
40e22e8f | 1540 | ip6_ins_rt(nrt); |
1da177e4 | 1541 | } |
1da177e4 LT |
1542 | out: |
1543 | dst_release(&rt->u.dst); | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * Misc support functions | |
1548 | */ | |
1549 | ||
1550 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1551 | { | |
1552 | struct rt6_info *rt = ip6_dst_alloc(); | |
1553 | ||
1554 | if (rt) { | |
1555 | rt->u.dst.input = ort->u.dst.input; | |
1556 | rt->u.dst.output = ort->u.dst.output; | |
1557 | ||
1558 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1559 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1560 | rt->u.dst.dev = ort->u.dst.dev; |
1561 | if (rt->u.dst.dev) | |
1562 | dev_hold(rt->u.dst.dev); | |
1563 | rt->rt6i_idev = ort->rt6i_idev; | |
1564 | if (rt->rt6i_idev) | |
1565 | in6_dev_hold(rt->rt6i_idev); | |
1566 | rt->u.dst.lastuse = jiffies; | |
1567 | rt->rt6i_expires = 0; | |
1568 | ||
1569 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1570 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1571 | rt->rt6i_metric = 0; | |
1572 | ||
1573 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1574 | #ifdef CONFIG_IPV6_SUBTREES | |
1575 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1576 | #endif | |
c71099ac | 1577 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1578 | } |
1579 | return rt; | |
1580 | } | |
1581 | ||
70ceb4f5 YH |
1582 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1583 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1584 | struct in6_addr *gwaddr, int ifindex) | |
1585 | { | |
1586 | struct fib6_node *fn; | |
1587 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1588 | struct fib6_table *table; |
1589 | ||
1590 | table = fib6_get_table(RT6_TABLE_INFO); | |
1591 | if (table == NULL) | |
1592 | return NULL; | |
70ceb4f5 | 1593 | |
c71099ac TG |
1594 | write_lock_bh(&table->tb6_lock); |
1595 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1596 | if (!fn) |
1597 | goto out; | |
1598 | ||
7cc48263 | 1599 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1600 | if (rt->rt6i_dev->ifindex != ifindex) |
1601 | continue; | |
1602 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1603 | continue; | |
1604 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1605 | continue; | |
1606 | dst_hold(&rt->u.dst); | |
1607 | break; | |
1608 | } | |
1609 | out: | |
c71099ac | 1610 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1611 | return rt; |
1612 | } | |
1613 | ||
1614 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1615 | struct in6_addr *gwaddr, int ifindex, | |
1616 | unsigned pref) | |
1617 | { | |
86872cb5 TG |
1618 | struct fib6_config cfg = { |
1619 | .fc_table = RT6_TABLE_INFO, | |
1620 | .fc_metric = 1024, | |
1621 | .fc_ifindex = ifindex, | |
1622 | .fc_dst_len = prefixlen, | |
1623 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1624 | RTF_UP | RTF_PREF(pref), | |
1625 | }; | |
1626 | ||
1627 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1628 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1629 | |
e317da96 YH |
1630 | /* We should treat it as a default route if prefix length is 0. */ |
1631 | if (!prefixlen) | |
86872cb5 | 1632 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1633 | |
86872cb5 | 1634 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1635 | |
1636 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1637 | } | |
1638 | #endif | |
1639 | ||
1da177e4 | 1640 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1641 | { |
1da177e4 | 1642 | struct rt6_info *rt; |
c71099ac | 1643 | struct fib6_table *table; |
1da177e4 | 1644 | |
c71099ac TG |
1645 | table = fib6_get_table(RT6_TABLE_DFLT); |
1646 | if (table == NULL) | |
1647 | return NULL; | |
1da177e4 | 1648 | |
c71099ac | 1649 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1650 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1651 | if (dev == rt->rt6i_dev && |
045927ff | 1652 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1653 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1654 | break; | |
1655 | } | |
1656 | if (rt) | |
1657 | dst_hold(&rt->u.dst); | |
c71099ac | 1658 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1659 | return rt; |
1660 | } | |
1661 | ||
1662 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1663 | struct net_device *dev, |
1664 | unsigned int pref) | |
1da177e4 | 1665 | { |
86872cb5 TG |
1666 | struct fib6_config cfg = { |
1667 | .fc_table = RT6_TABLE_DFLT, | |
1668 | .fc_metric = 1024, | |
1669 | .fc_ifindex = dev->ifindex, | |
1670 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1671 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1672 | }; | |
1da177e4 | 1673 | |
86872cb5 | 1674 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1675 | |
86872cb5 | 1676 | ip6_route_add(&cfg); |
1da177e4 | 1677 | |
1da177e4 LT |
1678 | return rt6_get_dflt_router(gwaddr, dev); |
1679 | } | |
1680 | ||
1681 | void rt6_purge_dflt_routers(void) | |
1682 | { | |
1683 | struct rt6_info *rt; | |
c71099ac TG |
1684 | struct fib6_table *table; |
1685 | ||
1686 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1687 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1688 | if (table == NULL) | |
1689 | return; | |
1da177e4 LT |
1690 | |
1691 | restart: | |
c71099ac | 1692 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1693 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1694 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1695 | dst_hold(&rt->u.dst); | |
c71099ac | 1696 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1697 | ip6_del_rt(rt); |
1da177e4 LT |
1698 | goto restart; |
1699 | } | |
1700 | } | |
c71099ac | 1701 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1702 | } |
1703 | ||
86872cb5 TG |
1704 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1705 | struct fib6_config *cfg) | |
1706 | { | |
1707 | memset(cfg, 0, sizeof(*cfg)); | |
1708 | ||
1709 | cfg->fc_table = RT6_TABLE_MAIN; | |
1710 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1711 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1712 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1713 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1714 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1715 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1716 | ||
1717 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1718 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1719 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1720 | } | |
1721 | ||
1da177e4 LT |
1722 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1723 | { | |
86872cb5 | 1724 | struct fib6_config cfg; |
1da177e4 LT |
1725 | struct in6_rtmsg rtmsg; |
1726 | int err; | |
1727 | ||
1728 | switch(cmd) { | |
1729 | case SIOCADDRT: /* Add a route */ | |
1730 | case SIOCDELRT: /* Delete a route */ | |
1731 | if (!capable(CAP_NET_ADMIN)) | |
1732 | return -EPERM; | |
1733 | err = copy_from_user(&rtmsg, arg, | |
1734 | sizeof(struct in6_rtmsg)); | |
1735 | if (err) | |
1736 | return -EFAULT; | |
86872cb5 TG |
1737 | |
1738 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1739 | ||
1da177e4 LT |
1740 | rtnl_lock(); |
1741 | switch (cmd) { | |
1742 | case SIOCADDRT: | |
86872cb5 | 1743 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1744 | break; |
1745 | case SIOCDELRT: | |
86872cb5 | 1746 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1747 | break; |
1748 | default: | |
1749 | err = -EINVAL; | |
1750 | } | |
1751 | rtnl_unlock(); | |
1752 | ||
1753 | return err; | |
3ff50b79 | 1754 | } |
1da177e4 LT |
1755 | |
1756 | return -EINVAL; | |
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * Drop the packet on the floor | |
1761 | */ | |
1762 | ||
612f09e8 YH |
1763 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, |
1764 | int ipstats_mib_noroutes) | |
1da177e4 | 1765 | { |
612f09e8 YH |
1766 | int type; |
1767 | switch (ipstats_mib_noroutes) { | |
1768 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1769 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1770 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1771 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1772 | break; | |
1773 | } | |
1774 | /* FALLTHROUGH */ | |
1775 | case IPSTATS_MIB_OUTNOROUTES: | |
1776 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1777 | break; | |
1778 | } | |
9ce8ade0 | 1779 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1780 | kfree_skb(skb); |
1781 | return 0; | |
1782 | } | |
1783 | ||
9ce8ade0 TG |
1784 | static int ip6_pkt_discard(struct sk_buff *skb) |
1785 | { | |
612f09e8 | 1786 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1787 | } |
1788 | ||
20380731 | 1789 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1790 | { |
1791 | skb->dev = skb->dst->dev; | |
612f09e8 | 1792 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1793 | } |
1794 | ||
6723ab54 DM |
1795 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1796 | ||
9ce8ade0 TG |
1797 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1798 | { | |
612f09e8 | 1799 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1800 | } |
1801 | ||
1802 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1803 | { | |
1804 | skb->dev = skb->dst->dev; | |
612f09e8 | 1805 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1806 | } |
1807 | ||
6723ab54 DM |
1808 | #endif |
1809 | ||
1da177e4 LT |
1810 | /* |
1811 | * Allocate a dst for local (unicast / anycast) address. | |
1812 | */ | |
1813 | ||
1814 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1815 | const struct in6_addr *addr, | |
1816 | int anycast) | |
1817 | { | |
1818 | struct rt6_info *rt = ip6_dst_alloc(); | |
1819 | ||
1820 | if (rt == NULL) | |
1821 | return ERR_PTR(-ENOMEM); | |
1822 | ||
2774c7ab | 1823 | dev_hold(init_net.loopback_dev); |
1da177e4 LT |
1824 | in6_dev_hold(idev); |
1825 | ||
1826 | rt->u.dst.flags = DST_HOST; | |
1827 | rt->u.dst.input = ip6_input; | |
1828 | rt->u.dst.output = ip6_output; | |
2774c7ab | 1829 | rt->rt6i_dev = init_net.loopback_dev; |
1da177e4 LT |
1830 | rt->rt6i_idev = idev; |
1831 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1832 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1833 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1834 | rt->u.dst.obsolete = -1; | |
1835 | ||
1836 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1837 | if (anycast) |
1838 | rt->rt6i_flags |= RTF_ANYCAST; | |
1839 | else | |
1da177e4 LT |
1840 | rt->rt6i_flags |= RTF_LOCAL; |
1841 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1842 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1843 | dst_free(&rt->u.dst); |
1da177e4 LT |
1844 | return ERR_PTR(-ENOMEM); |
1845 | } | |
1846 | ||
1847 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1848 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1849 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1850 | |
1851 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1852 | ||
1853 | return rt; | |
1854 | } | |
1855 | ||
1856 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1857 | { | |
1858 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1859 | rt != &ip6_null_entry) { | |
1860 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1861 | return -1; | |
1862 | } | |
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | void rt6_ifdown(struct net_device *dev) | |
1867 | { | |
c71099ac | 1868 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1869 | } |
1870 | ||
1871 | struct rt6_mtu_change_arg | |
1872 | { | |
1873 | struct net_device *dev; | |
1874 | unsigned mtu; | |
1875 | }; | |
1876 | ||
1877 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1878 | { | |
1879 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1880 | struct inet6_dev *idev; | |
1881 | ||
1882 | /* In IPv6 pmtu discovery is not optional, | |
1883 | so that RTAX_MTU lock cannot disable it. | |
1884 | We still use this lock to block changes | |
1885 | caused by addrconf/ndisc. | |
1886 | */ | |
1887 | ||
1888 | idev = __in6_dev_get(arg->dev); | |
1889 | if (idev == NULL) | |
1890 | return 0; | |
1891 | ||
1892 | /* For administrative MTU increase, there is no way to discover | |
1893 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1894 | Since RFC 1981 doesn't include administrative MTU increase | |
1895 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1896 | */ | |
1897 | /* | |
1898 | If new MTU is less than route PMTU, this new MTU will be the | |
1899 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1900 | decreases; if new MTU is greater than route PMTU, and the | |
1901 | old MTU is the lowest MTU in the path, update the route PMTU | |
1902 | to reflect the increase. In this case if the other nodes' MTU | |
1903 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1904 | PMTU discouvery. | |
1905 | */ | |
1906 | if (rt->rt6i_dev == arg->dev && | |
1907 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1ab1457c YH |
1908 | (dst_mtu(&rt->u.dst) > arg->mtu || |
1909 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
566cfd8f | 1910 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1911 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
566cfd8f SA |
1912 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
1913 | } | |
1da177e4 LT |
1914 | return 0; |
1915 | } | |
1916 | ||
1917 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1918 | { | |
c71099ac TG |
1919 | struct rt6_mtu_change_arg arg = { |
1920 | .dev = dev, | |
1921 | .mtu = mtu, | |
1922 | }; | |
1da177e4 | 1923 | |
c71099ac | 1924 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1925 | } |
1926 | ||
ef7c79ed | 1927 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1928 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1929 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1930 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1931 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1932 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1933 | }; | |
1934 | ||
1935 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1936 | struct fib6_config *cfg) | |
1da177e4 | 1937 | { |
86872cb5 TG |
1938 | struct rtmsg *rtm; |
1939 | struct nlattr *tb[RTA_MAX+1]; | |
1940 | int err; | |
1da177e4 | 1941 | |
86872cb5 TG |
1942 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1943 | if (err < 0) | |
1944 | goto errout; | |
1da177e4 | 1945 | |
86872cb5 TG |
1946 | err = -EINVAL; |
1947 | rtm = nlmsg_data(nlh); | |
1948 | memset(cfg, 0, sizeof(*cfg)); | |
1949 | ||
1950 | cfg->fc_table = rtm->rtm_table; | |
1951 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1952 | cfg->fc_src_len = rtm->rtm_src_len; | |
1953 | cfg->fc_flags = RTF_UP; | |
1954 | cfg->fc_protocol = rtm->rtm_protocol; | |
1955 | ||
1956 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1957 | cfg->fc_flags |= RTF_REJECT; | |
1958 | ||
1959 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1960 | cfg->fc_nlinfo.nlh = nlh; | |
1961 | ||
1962 | if (tb[RTA_GATEWAY]) { | |
1963 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1964 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1965 | } |
86872cb5 TG |
1966 | |
1967 | if (tb[RTA_DST]) { | |
1968 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1969 | ||
1970 | if (nla_len(tb[RTA_DST]) < plen) | |
1971 | goto errout; | |
1972 | ||
1973 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1974 | } |
86872cb5 TG |
1975 | |
1976 | if (tb[RTA_SRC]) { | |
1977 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1978 | ||
1979 | if (nla_len(tb[RTA_SRC]) < plen) | |
1980 | goto errout; | |
1981 | ||
1982 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1983 | } |
86872cb5 TG |
1984 | |
1985 | if (tb[RTA_OIF]) | |
1986 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1987 | ||
1988 | if (tb[RTA_PRIORITY]) | |
1989 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
1990 | ||
1991 | if (tb[RTA_METRICS]) { | |
1992 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
1993 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 1994 | } |
86872cb5 TG |
1995 | |
1996 | if (tb[RTA_TABLE]) | |
1997 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
1998 | ||
1999 | err = 0; | |
2000 | errout: | |
2001 | return err; | |
1da177e4 LT |
2002 | } |
2003 | ||
c127ea2c | 2004 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2005 | { |
b854272b | 2006 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2007 | struct fib6_config cfg; |
2008 | int err; | |
1da177e4 | 2009 | |
b854272b DL |
2010 | if (net != &init_net) |
2011 | return -EINVAL; | |
2012 | ||
86872cb5 TG |
2013 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2014 | if (err < 0) | |
2015 | return err; | |
2016 | ||
2017 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2018 | } |
2019 | ||
c127ea2c | 2020 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2021 | { |
b854272b | 2022 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2023 | struct fib6_config cfg; |
2024 | int err; | |
1da177e4 | 2025 | |
b854272b DL |
2026 | if (net != &init_net) |
2027 | return -EINVAL; | |
2028 | ||
86872cb5 TG |
2029 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2030 | if (err < 0) | |
2031 | return err; | |
2032 | ||
2033 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2034 | } |
2035 | ||
339bf98f TG |
2036 | static inline size_t rt6_nlmsg_size(void) |
2037 | { | |
2038 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2039 | + nla_total_size(16) /* RTA_SRC */ | |
2040 | + nla_total_size(16) /* RTA_DST */ | |
2041 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2042 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2043 | + nla_total_size(4) /* RTA_TABLE */ | |
2044 | + nla_total_size(4) /* RTA_IIF */ | |
2045 | + nla_total_size(4) /* RTA_OIF */ | |
2046 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2047 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2048 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2049 | } | |
2050 | ||
1da177e4 | 2051 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2052 | struct in6_addr *dst, struct in6_addr *src, |
2053 | int iif, int type, u32 pid, u32 seq, | |
2054 | int prefix, unsigned int flags) | |
1da177e4 LT |
2055 | { |
2056 | struct rtmsg *rtm; | |
2d7202bf | 2057 | struct nlmsghdr *nlh; |
e3703b3d | 2058 | long expires; |
9e762a4a | 2059 | u32 table; |
1da177e4 LT |
2060 | |
2061 | if (prefix) { /* user wants prefix routes only */ | |
2062 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2063 | /* success since this is not a prefix route */ | |
2064 | return 1; | |
2065 | } | |
2066 | } | |
2067 | ||
2d7202bf TG |
2068 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2069 | if (nlh == NULL) | |
26932566 | 2070 | return -EMSGSIZE; |
2d7202bf TG |
2071 | |
2072 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2073 | rtm->rtm_family = AF_INET6; |
2074 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2075 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2076 | rtm->rtm_tos = 0; | |
c71099ac | 2077 | if (rt->rt6i_table) |
9e762a4a | 2078 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2079 | else |
9e762a4a PM |
2080 | table = RT6_TABLE_UNSPEC; |
2081 | rtm->rtm_table = table; | |
2d7202bf | 2082 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2083 | if (rt->rt6i_flags&RTF_REJECT) |
2084 | rtm->rtm_type = RTN_UNREACHABLE; | |
2085 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2086 | rtm->rtm_type = RTN_LOCAL; | |
2087 | else | |
2088 | rtm->rtm_type = RTN_UNICAST; | |
2089 | rtm->rtm_flags = 0; | |
2090 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2091 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2092 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2093 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2094 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2095 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2096 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2097 | rtm->rtm_protocol = RTPROT_RA; | |
2098 | ||
2099 | if (rt->rt6i_flags&RTF_CACHE) | |
2100 | rtm->rtm_flags |= RTM_F_CLONED; | |
2101 | ||
2102 | if (dst) { | |
2d7202bf | 2103 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2104 | rtm->rtm_dst_len = 128; |
1da177e4 | 2105 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2106 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2107 | #ifdef CONFIG_IPV6_SUBTREES |
2108 | if (src) { | |
2d7202bf | 2109 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2110 | rtm->rtm_src_len = 128; |
1da177e4 | 2111 | } else if (rtm->rtm_src_len) |
2d7202bf | 2112 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2113 | #endif |
2114 | if (iif) | |
2d7202bf | 2115 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2116 | else if (dst) { |
2117 | struct in6_addr saddr_buf; | |
2118 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2119 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2120 | } |
2d7202bf | 2121 | |
1da177e4 | 2122 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2123 | goto nla_put_failure; |
2124 | ||
1da177e4 | 2125 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2126 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2127 | ||
1da177e4 | 2128 | if (rt->u.dst.dev) |
2d7202bf TG |
2129 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2130 | ||
2131 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2132 | |
2133 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2134 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2135 | expires, rt->u.dst.error) < 0) | |
2136 | goto nla_put_failure; | |
2d7202bf TG |
2137 | |
2138 | return nlmsg_end(skb, nlh); | |
2139 | ||
2140 | nla_put_failure: | |
26932566 PM |
2141 | nlmsg_cancel(skb, nlh); |
2142 | return -EMSGSIZE; | |
1da177e4 LT |
2143 | } |
2144 | ||
1b43af54 | 2145 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2146 | { |
2147 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2148 | int prefix; | |
2149 | ||
2d7202bf TG |
2150 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2151 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2152 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2153 | } else | |
2154 | prefix = 0; | |
2155 | ||
2156 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2157 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2158 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2159 | } |
2160 | ||
c127ea2c | 2161 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2162 | { |
b854272b | 2163 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2164 | struct nlattr *tb[RTA_MAX+1]; |
2165 | struct rt6_info *rt; | |
1da177e4 | 2166 | struct sk_buff *skb; |
ab364a6f | 2167 | struct rtmsg *rtm; |
1da177e4 | 2168 | struct flowi fl; |
ab364a6f | 2169 | int err, iif = 0; |
1da177e4 | 2170 | |
b854272b DL |
2171 | if (net != &init_net) |
2172 | return -EINVAL; | |
2173 | ||
ab364a6f TG |
2174 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2175 | if (err < 0) | |
2176 | goto errout; | |
1da177e4 | 2177 | |
ab364a6f | 2178 | err = -EINVAL; |
1da177e4 | 2179 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2180 | |
ab364a6f TG |
2181 | if (tb[RTA_SRC]) { |
2182 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2183 | goto errout; | |
2184 | ||
2185 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2186 | } | |
2187 | ||
2188 | if (tb[RTA_DST]) { | |
2189 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2190 | goto errout; | |
2191 | ||
2192 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2193 | } | |
2194 | ||
2195 | if (tb[RTA_IIF]) | |
2196 | iif = nla_get_u32(tb[RTA_IIF]); | |
2197 | ||
2198 | if (tb[RTA_OIF]) | |
2199 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2200 | |
2201 | if (iif) { | |
2202 | struct net_device *dev; | |
881d966b | 2203 | dev = __dev_get_by_index(&init_net, iif); |
1da177e4 LT |
2204 | if (!dev) { |
2205 | err = -ENODEV; | |
ab364a6f | 2206 | goto errout; |
1da177e4 LT |
2207 | } |
2208 | } | |
2209 | ||
ab364a6f TG |
2210 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2211 | if (skb == NULL) { | |
2212 | err = -ENOBUFS; | |
2213 | goto errout; | |
2214 | } | |
1da177e4 | 2215 | |
ab364a6f TG |
2216 | /* Reserve room for dummy headers, this skb can pass |
2217 | through good chunk of routing engine. | |
2218 | */ | |
459a98ed | 2219 | skb_reset_mac_header(skb); |
ab364a6f | 2220 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2221 | |
ab364a6f | 2222 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2223 | skb->dst = &rt->u.dst; |
2224 | ||
ab364a6f | 2225 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2226 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2227 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2228 | if (err < 0) { |
ab364a6f TG |
2229 | kfree_skb(skb); |
2230 | goto errout; | |
1da177e4 LT |
2231 | } |
2232 | ||
97c53cac | 2233 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2234 | errout: |
1da177e4 | 2235 | return err; |
1da177e4 LT |
2236 | } |
2237 | ||
86872cb5 | 2238 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2239 | { |
2240 | struct sk_buff *skb; | |
86872cb5 TG |
2241 | u32 pid = 0, seq = 0; |
2242 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2243 | int err = -ENOBUFS; |
2244 | ||
86872cb5 TG |
2245 | if (info) { |
2246 | pid = info->pid; | |
2247 | nlh = info->nlh; | |
2248 | if (nlh) | |
2249 | seq = nlh->nlmsg_seq; | |
2250 | } | |
2251 | ||
339bf98f | 2252 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2253 | if (skb == NULL) |
2254 | goto errout; | |
2255 | ||
2256 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
26932566 PM |
2257 | if (err < 0) { |
2258 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2259 | WARN_ON(err == -EMSGSIZE); | |
2260 | kfree_skb(skb); | |
2261 | goto errout; | |
2262 | } | |
97c53cac | 2263 | err = rtnl_notify(skb, &init_net, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); |
21713ebc TG |
2264 | errout: |
2265 | if (err < 0) | |
97c53cac | 2266 | rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2267 | } |
2268 | ||
2269 | /* | |
2270 | * /proc | |
2271 | */ | |
2272 | ||
2273 | #ifdef CONFIG_PROC_FS | |
2274 | ||
2275 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2276 | ||
2277 | struct rt6_proc_arg | |
2278 | { | |
2279 | char *buffer; | |
2280 | int offset; | |
2281 | int length; | |
2282 | int skip; | |
2283 | int len; | |
2284 | }; | |
2285 | ||
2286 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2287 | { | |
33120b30 | 2288 | struct seq_file *m = p_arg; |
1da177e4 | 2289 | |
33120b30 AD |
2290 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2291 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2292 | |
2293 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2294 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2295 | rt->rt6i_src.plen); | |
1da177e4 | 2296 | #else |
33120b30 | 2297 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2298 | #endif |
2299 | ||
2300 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2301 | seq_printf(m, NIP6_SEQFMT, |
2302 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2303 | } else { |
33120b30 | 2304 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2305 | } |
33120b30 AD |
2306 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2307 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2308 | rt->u.dst.__use, rt->rt6i_flags, | |
2309 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2310 | return 0; |
2311 | } | |
2312 | ||
33120b30 | 2313 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2314 | { |
33120b30 AD |
2315 | fib6_clean_all(rt6_info_route, 0, m); |
2316 | return 0; | |
2317 | } | |
1da177e4 | 2318 | |
33120b30 AD |
2319 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2320 | { | |
2321 | return single_open(file, ipv6_route_show, NULL); | |
1da177e4 LT |
2322 | } |
2323 | ||
33120b30 AD |
2324 | static const struct file_operations ipv6_route_proc_fops = { |
2325 | .owner = THIS_MODULE, | |
2326 | .open = ipv6_route_open, | |
2327 | .read = seq_read, | |
2328 | .llseek = seq_lseek, | |
2329 | .release = single_release, | |
2330 | }; | |
2331 | ||
1da177e4 LT |
2332 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2333 | { | |
2334 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2335 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2336 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2337 | rt6_stats.fib_rt_cache, | |
2338 | atomic_read(&ip6_dst_ops.entries), | |
2339 | rt6_stats.fib_discarded_routes); | |
2340 | ||
2341 | return 0; | |
2342 | } | |
2343 | ||
2344 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2345 | { | |
2346 | return single_open(file, rt6_stats_seq_show, NULL); | |
2347 | } | |
2348 | ||
9a32144e | 2349 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2350 | .owner = THIS_MODULE, |
2351 | .open = rt6_stats_seq_open, | |
2352 | .read = seq_read, | |
2353 | .llseek = seq_lseek, | |
2354 | .release = single_release, | |
2355 | }; | |
2356 | #endif /* CONFIG_PROC_FS */ | |
2357 | ||
2358 | #ifdef CONFIG_SYSCTL | |
2359 | ||
2360 | static int flush_delay; | |
2361 | ||
2362 | static | |
2363 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2364 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2365 | { | |
2366 | if (write) { | |
2367 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2368 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2369 | return 0; | |
2370 | } else | |
2371 | return -EINVAL; | |
2372 | } | |
2373 | ||
2374 | ctl_table ipv6_route_table[] = { | |
1ab1457c | 2375 | { |
1da177e4 | 2376 | .procname = "flush", |
1ab1457c | 2377 | .data = &flush_delay, |
1da177e4 | 2378 | .maxlen = sizeof(int), |
89c8b3a1 | 2379 | .mode = 0200, |
1ab1457c | 2380 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2381 | }, |
2382 | { | |
2383 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2384 | .procname = "gc_thresh", | |
1ab1457c | 2385 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2386 | .maxlen = sizeof(int), |
2387 | .mode = 0644, | |
1ab1457c | 2388 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2389 | }, |
2390 | { | |
2391 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2392 | .procname = "max_size", | |
1ab1457c | 2393 | .data = &ip6_rt_max_size, |
1da177e4 LT |
2394 | .maxlen = sizeof(int), |
2395 | .mode = 0644, | |
1ab1457c | 2396 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2397 | }, |
2398 | { | |
2399 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2400 | .procname = "gc_min_interval", | |
1ab1457c | 2401 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2402 | .maxlen = sizeof(int), |
2403 | .mode = 0644, | |
1ab1457c | 2404 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2405 | .strategy = &sysctl_jiffies, |
2406 | }, | |
2407 | { | |
2408 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2409 | .procname = "gc_timeout", | |
1ab1457c | 2410 | .data = &ip6_rt_gc_timeout, |
1da177e4 LT |
2411 | .maxlen = sizeof(int), |
2412 | .mode = 0644, | |
1ab1457c | 2413 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2414 | .strategy = &sysctl_jiffies, |
2415 | }, | |
2416 | { | |
2417 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2418 | .procname = "gc_interval", | |
1ab1457c | 2419 | .data = &ip6_rt_gc_interval, |
1da177e4 LT |
2420 | .maxlen = sizeof(int), |
2421 | .mode = 0644, | |
1ab1457c | 2422 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2423 | .strategy = &sysctl_jiffies, |
2424 | }, | |
2425 | { | |
2426 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2427 | .procname = "gc_elasticity", | |
1ab1457c | 2428 | .data = &ip6_rt_gc_elasticity, |
1da177e4 LT |
2429 | .maxlen = sizeof(int), |
2430 | .mode = 0644, | |
1ab1457c | 2431 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2432 | .strategy = &sysctl_jiffies, |
2433 | }, | |
2434 | { | |
2435 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2436 | .procname = "mtu_expires", | |
1ab1457c | 2437 | .data = &ip6_rt_mtu_expires, |
1da177e4 LT |
2438 | .maxlen = sizeof(int), |
2439 | .mode = 0644, | |
1ab1457c | 2440 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2441 | .strategy = &sysctl_jiffies, |
2442 | }, | |
2443 | { | |
2444 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2445 | .procname = "min_adv_mss", | |
1ab1457c | 2446 | .data = &ip6_rt_min_advmss, |
1da177e4 LT |
2447 | .maxlen = sizeof(int), |
2448 | .mode = 0644, | |
1ab1457c | 2449 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2450 | .strategy = &sysctl_jiffies, |
2451 | }, | |
2452 | { | |
2453 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2454 | .procname = "gc_min_interval_ms", | |
1ab1457c | 2455 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2456 | .maxlen = sizeof(int), |
2457 | .mode = 0644, | |
1ab1457c | 2458 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2459 | .strategy = &sysctl_ms_jiffies, |
2460 | }, | |
2461 | { .ctl_name = 0 } | |
2462 | }; | |
2463 | ||
2464 | #endif | |
2465 | ||
2466 | void __init ip6_route_init(void) | |
2467 | { | |
e5d679f3 AD |
2468 | ip6_dst_ops.kmem_cachep = |
2469 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
20c2df83 | 2470 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
14e50e57 DM |
2471 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2472 | ||
1da177e4 | 2473 | fib6_init(); |
33120b30 | 2474 | proc_net_fops_create(&init_net, "ipv6_route", 0, &ipv6_route_proc_fops); |
457c4cbc | 2475 | proc_net_fops_create(&init_net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); |
1da177e4 LT |
2476 | #ifdef CONFIG_XFRM |
2477 | xfrm6_init(); | |
2478 | #endif | |
101367c2 TG |
2479 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2480 | fib6_rules_init(); | |
2481 | #endif | |
c127ea2c TG |
2482 | |
2483 | __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL); | |
2484 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL); | |
2485 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL); | |
1da177e4 LT |
2486 | } |
2487 | ||
2488 | void ip6_route_cleanup(void) | |
2489 | { | |
101367c2 TG |
2490 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2491 | fib6_rules_cleanup(); | |
2492 | #endif | |
1da177e4 | 2493 | #ifdef CONFIG_PROC_FS |
457c4cbc EB |
2494 | proc_net_remove(&init_net, "ipv6_route"); |
2495 | proc_net_remove(&init_net, "rt6_stats"); | |
1da177e4 LT |
2496 | #endif |
2497 | #ifdef CONFIG_XFRM | |
2498 | xfrm6_fini(); | |
2499 | #endif | |
2500 | rt6_ifdown(NULL); | |
2501 | fib6_gc_cleanup(); | |
2502 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2503 | } |