Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 | 40 | #include <linux/if_arp.h> |
1da177e4 LT |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> | |
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; | |
5a3e55d6 DL |
219 | struct net_device *loopback_dev = |
220 | dev->nd_net->loopback_dev; | |
1da177e4 | 221 | |
5a3e55d6 DL |
222 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
223 | struct inet6_dev *loopback_idev = | |
224 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
225 | if (loopback_idev != NULL) { |
226 | rt->rt6i_idev = loopback_idev; | |
227 | in6_dev_put(idev); | |
228 | } | |
229 | } | |
230 | } | |
231 | ||
232 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
233 | { | |
234 | return (rt->rt6i_flags & RTF_EXPIRES && | |
235 | time_after(jiffies, rt->rt6i_expires)); | |
236 | } | |
237 | ||
c71099ac TG |
238 | static inline int rt6_need_strict(struct in6_addr *daddr) |
239 | { | |
240 | return (ipv6_addr_type(daddr) & | |
241 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
242 | } | |
243 | ||
1da177e4 | 244 | /* |
c71099ac | 245 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
246 | */ |
247 | ||
248 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
249 | int oif, | |
250 | int strict) | |
251 | { | |
252 | struct rt6_info *local = NULL; | |
253 | struct rt6_info *sprt; | |
254 | ||
255 | if (oif) { | |
7cc48263 | 256 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
257 | struct net_device *dev = sprt->rt6i_dev; |
258 | if (dev->ifindex == oif) | |
259 | return sprt; | |
260 | if (dev->flags & IFF_LOOPBACK) { | |
261 | if (sprt->rt6i_idev == NULL || | |
262 | sprt->rt6i_idev->dev->ifindex != oif) { | |
263 | if (strict && oif) | |
264 | continue; | |
1ab1457c | 265 | if (local && (!oif || |
1da177e4 LT |
266 | local->rt6i_idev->dev->ifindex == oif)) |
267 | continue; | |
268 | } | |
269 | local = sprt; | |
270 | } | |
271 | } | |
272 | ||
273 | if (local) | |
274 | return local; | |
275 | ||
276 | if (strict) | |
277 | return &ip6_null_entry; | |
278 | } | |
279 | return rt; | |
280 | } | |
281 | ||
27097255 YH |
282 | #ifdef CONFIG_IPV6_ROUTER_PREF |
283 | static void rt6_probe(struct rt6_info *rt) | |
284 | { | |
285 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
286 | /* | |
287 | * Okay, this does not seem to be appropriate | |
288 | * for now, however, we need to check if it | |
289 | * is really so; aka Router Reachability Probing. | |
290 | * | |
291 | * Router Reachability Probe MUST be rate-limited | |
292 | * to no more than one per minute. | |
293 | */ | |
294 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
295 | return; | |
296 | read_lock_bh(&neigh->lock); | |
297 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 298 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
299 | struct in6_addr mcaddr; |
300 | struct in6_addr *target; | |
301 | ||
302 | neigh->updated = jiffies; | |
303 | read_unlock_bh(&neigh->lock); | |
304 | ||
305 | target = (struct in6_addr *)&neigh->primary_key; | |
306 | addrconf_addr_solict_mult(target, &mcaddr); | |
307 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
308 | } else | |
309 | read_unlock_bh(&neigh->lock); | |
310 | } | |
311 | #else | |
312 | static inline void rt6_probe(struct rt6_info *rt) | |
313 | { | |
314 | return; | |
315 | } | |
316 | #endif | |
317 | ||
1da177e4 | 318 | /* |
554cfb7e | 319 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 320 | */ |
b6f99a21 | 321 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
322 | { |
323 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 324 | if (!oif || dev->ifindex == oif) |
554cfb7e | 325 | return 2; |
161980f4 DM |
326 | if ((dev->flags & IFF_LOOPBACK) && |
327 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
328 | return 1; | |
329 | return 0; | |
554cfb7e | 330 | } |
1da177e4 | 331 | |
b6f99a21 | 332 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 333 | { |
554cfb7e | 334 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 335 | int m; |
4d0c5911 YH |
336 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
337 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
338 | m = 1; | |
339 | else if (neigh) { | |
554cfb7e YH |
340 | read_lock_bh(&neigh->lock); |
341 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 342 | m = 2; |
398bcbeb YH |
343 | #ifdef CONFIG_IPV6_ROUTER_PREF |
344 | else if (neigh->nud_state & NUD_FAILED) | |
345 | m = 0; | |
346 | #endif | |
347 | else | |
ea73ee23 | 348 | m = 1; |
554cfb7e | 349 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
350 | } else |
351 | m = 0; | |
554cfb7e | 352 | return m; |
1da177e4 LT |
353 | } |
354 | ||
554cfb7e YH |
355 | static int rt6_score_route(struct rt6_info *rt, int oif, |
356 | int strict) | |
1da177e4 | 357 | { |
4d0c5911 | 358 | int m, n; |
1ab1457c | 359 | |
4d0c5911 | 360 | m = rt6_check_dev(rt, oif); |
77d16f45 | 361 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 362 | return -1; |
ebacaaa0 YH |
363 | #ifdef CONFIG_IPV6_ROUTER_PREF |
364 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
365 | #endif | |
4d0c5911 | 366 | n = rt6_check_neigh(rt); |
557e92ef | 367 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
368 | return -1; |
369 | return m; | |
370 | } | |
371 | ||
f11e6659 DM |
372 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
373 | int *mpri, struct rt6_info *match) | |
554cfb7e | 374 | { |
f11e6659 DM |
375 | int m; |
376 | ||
377 | if (rt6_check_expired(rt)) | |
378 | goto out; | |
379 | ||
380 | m = rt6_score_route(rt, oif, strict); | |
381 | if (m < 0) | |
382 | goto out; | |
383 | ||
384 | if (m > *mpri) { | |
385 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
386 | rt6_probe(match); | |
387 | *mpri = m; | |
388 | match = rt; | |
389 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
390 | rt6_probe(rt); | |
391 | } | |
392 | ||
393 | out: | |
394 | return match; | |
395 | } | |
396 | ||
397 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
398 | struct rt6_info *rr_head, | |
399 | u32 metric, int oif, int strict) | |
400 | { | |
401 | struct rt6_info *rt, *match; | |
554cfb7e | 402 | int mpri = -1; |
1da177e4 | 403 | |
f11e6659 DM |
404 | match = NULL; |
405 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
406 | rt = rt->u.dst.rt6_next) | |
407 | match = find_match(rt, oif, strict, &mpri, match); | |
408 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
409 | rt = rt->u.dst.rt6_next) | |
410 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 411 | |
f11e6659 DM |
412 | return match; |
413 | } | |
1da177e4 | 414 | |
f11e6659 DM |
415 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
416 | { | |
417 | struct rt6_info *match, *rt0; | |
1da177e4 | 418 | |
f11e6659 DM |
419 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
420 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 421 | |
f11e6659 DM |
422 | rt0 = fn->rr_ptr; |
423 | if (!rt0) | |
424 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 425 | |
f11e6659 | 426 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 427 | |
554cfb7e | 428 | if (!match && |
f11e6659 DM |
429 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
430 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
431 | ||
554cfb7e | 432 | /* no entries matched; do round-robin */ |
f11e6659 DM |
433 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
434 | next = fn->leaf; | |
435 | ||
436 | if (next != rt0) | |
437 | fn->rr_ptr = next; | |
1da177e4 | 438 | } |
1da177e4 | 439 | |
f11e6659 DM |
440 | RT6_TRACE("%s() => %p\n", |
441 | __FUNCTION__, match); | |
1da177e4 | 442 | |
554cfb7e | 443 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
444 | } |
445 | ||
70ceb4f5 YH |
446 | #ifdef CONFIG_IPV6_ROUTE_INFO |
447 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
448 | struct in6_addr *gwaddr) | |
449 | { | |
450 | struct route_info *rinfo = (struct route_info *) opt; | |
451 | struct in6_addr prefix_buf, *prefix; | |
452 | unsigned int pref; | |
453 | u32 lifetime; | |
454 | struct rt6_info *rt; | |
455 | ||
456 | if (len < sizeof(struct route_info)) { | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | /* Sanity check for prefix_len and length */ | |
461 | if (rinfo->length > 3) { | |
462 | return -EINVAL; | |
463 | } else if (rinfo->prefix_len > 128) { | |
464 | return -EINVAL; | |
465 | } else if (rinfo->prefix_len > 64) { | |
466 | if (rinfo->length < 2) { | |
467 | return -EINVAL; | |
468 | } | |
469 | } else if (rinfo->prefix_len > 0) { | |
470 | if (rinfo->length < 1) { | |
471 | return -EINVAL; | |
472 | } | |
473 | } | |
474 | ||
475 | pref = rinfo->route_pref; | |
476 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
477 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
478 | ||
e69a4adc | 479 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
480 | if (lifetime == 0xffffffff) { |
481 | /* infinity */ | |
482 | } else if (lifetime > 0x7fffffff/HZ) { | |
483 | /* Avoid arithmetic overflow */ | |
484 | lifetime = 0x7fffffff/HZ - 1; | |
485 | } | |
486 | ||
487 | if (rinfo->length == 3) | |
488 | prefix = (struct in6_addr *)rinfo->prefix; | |
489 | else { | |
490 | /* this function is safe */ | |
491 | ipv6_addr_prefix(&prefix_buf, | |
492 | (struct in6_addr *)rinfo->prefix, | |
493 | rinfo->prefix_len); | |
494 | prefix = &prefix_buf; | |
495 | } | |
496 | ||
497 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
498 | ||
499 | if (rt && !lifetime) { | |
e0a1ad73 | 500 | ip6_del_rt(rt); |
70ceb4f5 YH |
501 | rt = NULL; |
502 | } | |
503 | ||
504 | if (!rt && lifetime) | |
505 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
506 | pref); | |
507 | else if (rt) | |
508 | rt->rt6i_flags = RTF_ROUTEINFO | | |
509 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
510 | ||
511 | if (rt) { | |
512 | if (lifetime == 0xffffffff) { | |
513 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
514 | } else { | |
515 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
516 | rt->rt6i_flags |= RTF_EXPIRES; | |
517 | } | |
518 | dst_release(&rt->u.dst); | |
519 | } | |
520 | return 0; | |
521 | } | |
522 | #endif | |
523 | ||
982f56f3 YH |
524 | #define BACKTRACK(saddr) \ |
525 | do { \ | |
526 | if (rt == &ip6_null_entry) { \ | |
527 | struct fib6_node *pn; \ | |
e0eda7bb | 528 | while (1) { \ |
982f56f3 YH |
529 | if (fn->fn_flags & RTN_TL_ROOT) \ |
530 | goto out; \ | |
531 | pn = fn->parent; \ | |
532 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 533 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
534 | else \ |
535 | fn = pn; \ | |
536 | if (fn->fn_flags & RTN_RTINFO) \ | |
537 | goto restart; \ | |
c71099ac | 538 | } \ |
c71099ac | 539 | } \ |
982f56f3 | 540 | } while(0) |
c71099ac TG |
541 | |
542 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
543 | struct flowi *fl, int flags) | |
1da177e4 LT |
544 | { |
545 | struct fib6_node *fn; | |
546 | struct rt6_info *rt; | |
547 | ||
c71099ac TG |
548 | read_lock_bh(&table->tb6_lock); |
549 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
550 | restart: | |
551 | rt = fn->leaf; | |
77d16f45 | 552 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 553 | BACKTRACK(&fl->fl6_src); |
c71099ac | 554 | out: |
03f49f34 | 555 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 556 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
557 | return rt; |
558 | ||
559 | } | |
560 | ||
561 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
562 | int oif, int strict) | |
563 | { | |
564 | struct flowi fl = { | |
565 | .oif = oif, | |
566 | .nl_u = { | |
567 | .ip6_u = { | |
568 | .daddr = *daddr, | |
c71099ac TG |
569 | }, |
570 | }, | |
571 | }; | |
572 | struct dst_entry *dst; | |
77d16f45 | 573 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 574 | |
adaa70bb TG |
575 | if (saddr) { |
576 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
577 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
578 | } | |
579 | ||
c71099ac TG |
580 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
581 | if (dst->error == 0) | |
582 | return (struct rt6_info *) dst; | |
583 | ||
584 | dst_release(dst); | |
585 | ||
1da177e4 LT |
586 | return NULL; |
587 | } | |
588 | ||
7159039a YH |
589 | EXPORT_SYMBOL(rt6_lookup); |
590 | ||
c71099ac | 591 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
592 | It takes new route entry, the addition fails by any reason the |
593 | route is freed. In any case, if caller does not hold it, it may | |
594 | be destroyed. | |
595 | */ | |
596 | ||
86872cb5 | 597 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
598 | { |
599 | int err; | |
c71099ac | 600 | struct fib6_table *table; |
1da177e4 | 601 | |
c71099ac TG |
602 | table = rt->rt6i_table; |
603 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 604 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 605 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
606 | |
607 | return err; | |
608 | } | |
609 | ||
40e22e8f TG |
610 | int ip6_ins_rt(struct rt6_info *rt) |
611 | { | |
86872cb5 | 612 | return __ip6_ins_rt(rt, NULL); |
40e22e8f TG |
613 | } |
614 | ||
95a9a5ba YH |
615 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
616 | struct in6_addr *saddr) | |
1da177e4 | 617 | { |
1da177e4 LT |
618 | struct rt6_info *rt; |
619 | ||
620 | /* | |
621 | * Clone the route. | |
622 | */ | |
623 | ||
624 | rt = ip6_rt_copy(ort); | |
625 | ||
626 | if (rt) { | |
58c4fb86 YH |
627 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
628 | if (rt->rt6i_dst.plen != 128 && | |
629 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
630 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 631 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 632 | } |
1da177e4 | 633 | |
58c4fb86 | 634 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
635 | rt->rt6i_dst.plen = 128; |
636 | rt->rt6i_flags |= RTF_CACHE; | |
637 | rt->u.dst.flags |= DST_HOST; | |
638 | ||
639 | #ifdef CONFIG_IPV6_SUBTREES | |
640 | if (rt->rt6i_src.plen && saddr) { | |
641 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
642 | rt->rt6i_src.plen = 128; | |
643 | } | |
644 | #endif | |
645 | ||
646 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
647 | ||
95a9a5ba | 648 | } |
1da177e4 | 649 | |
95a9a5ba YH |
650 | return rt; |
651 | } | |
1da177e4 | 652 | |
299d9939 YH |
653 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
654 | { | |
655 | struct rt6_info *rt = ip6_rt_copy(ort); | |
656 | if (rt) { | |
657 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
658 | rt->rt6i_dst.plen = 128; | |
659 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
660 | rt->u.dst.flags |= DST_HOST; |
661 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
662 | } | |
663 | return rt; | |
664 | } | |
665 | ||
4acad72d | 666 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, |
8ce11e6a | 667 | struct flowi *fl, int flags) |
1da177e4 LT |
668 | { |
669 | struct fib6_node *fn; | |
519fbd87 | 670 | struct rt6_info *rt, *nrt; |
c71099ac | 671 | int strict = 0; |
1da177e4 | 672 | int attempts = 3; |
519fbd87 | 673 | int err; |
ea659e07 | 674 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 675 | |
77d16f45 | 676 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
677 | |
678 | relookup: | |
c71099ac | 679 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 680 | |
8238dd06 | 681 | restart_2: |
c71099ac | 682 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
683 | |
684 | restart: | |
4acad72d | 685 | rt = rt6_select(fn, oif, strict | reachable); |
982f56f3 | 686 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
687 | if (rt == &ip6_null_entry || |
688 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 689 | goto out; |
1da177e4 | 690 | |
fb9de91e | 691 | dst_hold(&rt->u.dst); |
c71099ac | 692 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 693 | |
519fbd87 | 694 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 695 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
696 | else { |
697 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 698 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
699 | #else |
700 | goto out2; | |
701 | #endif | |
702 | } | |
e40cf353 | 703 | |
519fbd87 YH |
704 | dst_release(&rt->u.dst); |
705 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 706 | |
519fbd87 YH |
707 | dst_hold(&rt->u.dst); |
708 | if (nrt) { | |
40e22e8f | 709 | err = ip6_ins_rt(nrt); |
519fbd87 | 710 | if (!err) |
1da177e4 | 711 | goto out2; |
1da177e4 | 712 | } |
1da177e4 | 713 | |
519fbd87 YH |
714 | if (--attempts <= 0) |
715 | goto out2; | |
716 | ||
717 | /* | |
c71099ac | 718 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
719 | * released someone could insert this route. Relookup. |
720 | */ | |
721 | dst_release(&rt->u.dst); | |
722 | goto relookup; | |
723 | ||
724 | out: | |
8238dd06 YH |
725 | if (reachable) { |
726 | reachable = 0; | |
727 | goto restart_2; | |
728 | } | |
519fbd87 | 729 | dst_hold(&rt->u.dst); |
c71099ac | 730 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
731 | out2: |
732 | rt->u.dst.lastuse = jiffies; | |
733 | rt->u.dst.__use++; | |
c71099ac TG |
734 | |
735 | return rt; | |
1da177e4 LT |
736 | } |
737 | ||
4acad72d PE |
738 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
739 | struct flowi *fl, int flags) | |
740 | { | |
741 | return ip6_pol_route(table, fl->iif, fl, flags); | |
742 | } | |
743 | ||
c71099ac TG |
744 | void ip6_route_input(struct sk_buff *skb) |
745 | { | |
0660e03f | 746 | struct ipv6hdr *iph = ipv6_hdr(skb); |
adaa70bb | 747 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
748 | struct flowi fl = { |
749 | .iif = skb->dev->ifindex, | |
750 | .nl_u = { | |
751 | .ip6_u = { | |
752 | .daddr = iph->daddr, | |
753 | .saddr = iph->saddr, | |
90bcaf7b | 754 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
755 | }, |
756 | }, | |
1ab1457c | 757 | .mark = skb->mark, |
c71099ac TG |
758 | .proto = iph->nexthdr, |
759 | }; | |
adaa70bb TG |
760 | |
761 | if (rt6_need_strict(&iph->daddr)) | |
762 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
763 | |
764 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
765 | } | |
766 | ||
767 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
768 | struct flowi *fl, int flags) | |
1da177e4 | 769 | { |
4acad72d | 770 | return ip6_pol_route(table, fl->oif, fl, flags); |
c71099ac TG |
771 | } |
772 | ||
773 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
774 | { | |
775 | int flags = 0; | |
776 | ||
777 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 778 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 779 | |
adaa70bb TG |
780 | if (!ipv6_addr_any(&fl->fl6_src)) |
781 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
782 | ||
c71099ac | 783 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
784 | } |
785 | ||
7159039a | 786 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 787 | |
14e50e57 DM |
788 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
789 | { | |
790 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
791 | struct rt6_info *rt = (struct rt6_info *) | |
792 | dst_alloc(&ip6_dst_blackhole_ops); | |
793 | struct dst_entry *new = NULL; | |
794 | ||
795 | if (rt) { | |
796 | new = &rt->u.dst; | |
797 | ||
798 | atomic_set(&new->__refcnt, 1); | |
799 | new->__use = 1; | |
352e512c HX |
800 | new->input = dst_discard; |
801 | new->output = dst_discard; | |
14e50e57 DM |
802 | |
803 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
804 | new->dev = ort->u.dst.dev; | |
805 | if (new->dev) | |
806 | dev_hold(new->dev); | |
807 | rt->rt6i_idev = ort->rt6i_idev; | |
808 | if (rt->rt6i_idev) | |
809 | in6_dev_hold(rt->rt6i_idev); | |
810 | rt->rt6i_expires = 0; | |
811 | ||
812 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
813 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
814 | rt->rt6i_metric = 0; | |
815 | ||
816 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
817 | #ifdef CONFIG_IPV6_SUBTREES | |
818 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
819 | #endif | |
820 | ||
821 | dst_free(new); | |
822 | } | |
823 | ||
824 | dst_release(*dstp); | |
825 | *dstp = new; | |
826 | return (new ? 0 : -ENOMEM); | |
827 | } | |
828 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
829 | ||
1da177e4 LT |
830 | /* |
831 | * Destination cache support functions | |
832 | */ | |
833 | ||
834 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
835 | { | |
836 | struct rt6_info *rt; | |
837 | ||
838 | rt = (struct rt6_info *) dst; | |
839 | ||
840 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
841 | return dst; | |
842 | ||
843 | return NULL; | |
844 | } | |
845 | ||
846 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
847 | { | |
848 | struct rt6_info *rt = (struct rt6_info *) dst; | |
849 | ||
850 | if (rt) { | |
851 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 852 | ip6_del_rt(rt); |
1da177e4 LT |
853 | else |
854 | dst_release(dst); | |
855 | } | |
856 | return NULL; | |
857 | } | |
858 | ||
859 | static void ip6_link_failure(struct sk_buff *skb) | |
860 | { | |
861 | struct rt6_info *rt; | |
862 | ||
863 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
864 | ||
865 | rt = (struct rt6_info *) skb->dst; | |
866 | if (rt) { | |
867 | if (rt->rt6i_flags&RTF_CACHE) { | |
868 | dst_set_expires(&rt->u.dst, 0); | |
869 | rt->rt6i_flags |= RTF_EXPIRES; | |
870 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
871 | rt->rt6i_node->fn_sernum = -1; | |
872 | } | |
873 | } | |
874 | ||
875 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
876 | { | |
877 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
878 | ||
879 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
880 | rt6->rt6i_flags |= RTF_MODIFIED; | |
881 | if (mtu < IPV6_MIN_MTU) { | |
882 | mtu = IPV6_MIN_MTU; | |
883 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
884 | } | |
885 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 886 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
887 | } |
888 | } | |
889 | ||
1da177e4 LT |
890 | static int ipv6_get_mtu(struct net_device *dev); |
891 | ||
892 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
893 | { | |
894 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
895 | ||
896 | if (mtu < ip6_rt_min_advmss) | |
897 | mtu = ip6_rt_min_advmss; | |
898 | ||
899 | /* | |
1ab1457c YH |
900 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
901 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
902 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
903 | * rely only on pmtu discovery" |
904 | */ | |
905 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
906 | mtu = IPV6_MAXPLEN; | |
907 | return mtu; | |
908 | } | |
909 | ||
5d0bbeeb | 910 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 911 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 912 | |
1ab1457c | 913 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
1da177e4 LT |
914 | struct neighbour *neigh, |
915 | struct in6_addr *addr, | |
916 | int (*output)(struct sk_buff *)) | |
917 | { | |
918 | struct rt6_info *rt; | |
919 | struct inet6_dev *idev = in6_dev_get(dev); | |
920 | ||
921 | if (unlikely(idev == NULL)) | |
922 | return NULL; | |
923 | ||
924 | rt = ip6_dst_alloc(); | |
925 | if (unlikely(rt == NULL)) { | |
926 | in6_dev_put(idev); | |
927 | goto out; | |
928 | } | |
929 | ||
930 | dev_hold(dev); | |
931 | if (neigh) | |
932 | neigh_hold(neigh); | |
933 | else | |
934 | neigh = ndisc_get_neigh(dev, addr); | |
935 | ||
936 | rt->rt6i_dev = dev; | |
937 | rt->rt6i_idev = idev; | |
938 | rt->rt6i_nexthop = neigh; | |
939 | atomic_set(&rt->u.dst.__refcnt, 1); | |
940 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
941 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
942 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
943 | rt->u.dst.output = output; | |
944 | ||
945 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
946 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
947 | ? DST_HOST | |
1da177e4 LT |
948 | : 0; |
949 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
950 | rt->rt6i_dst.plen = 128; | |
951 | #endif | |
952 | ||
5d0bbeeb | 953 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
954 | rt->u.dst.next = ndisc_dst_gc_list; |
955 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 956 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
957 | |
958 | fib6_force_start_gc(); | |
959 | ||
960 | out: | |
40aa7b90 | 961 | return &rt->u.dst; |
1da177e4 LT |
962 | } |
963 | ||
964 | int ndisc_dst_gc(int *more) | |
965 | { | |
966 | struct dst_entry *dst, *next, **pprev; | |
967 | int freed; | |
968 | ||
969 | next = NULL; | |
1ab1457c | 970 | freed = 0; |
5d0bbeeb TG |
971 | |
972 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 973 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 974 | |
1da177e4 LT |
975 | while ((dst = *pprev) != NULL) { |
976 | if (!atomic_read(&dst->__refcnt)) { | |
977 | *pprev = dst->next; | |
978 | dst_free(dst); | |
979 | freed++; | |
980 | } else { | |
981 | pprev = &dst->next; | |
982 | (*more)++; | |
983 | } | |
984 | } | |
985 | ||
5d0bbeeb TG |
986 | spin_unlock_bh(&ndisc_lock); |
987 | ||
1da177e4 LT |
988 | return freed; |
989 | } | |
990 | ||
991 | static int ip6_dst_gc(void) | |
992 | { | |
993 | static unsigned expire = 30*HZ; | |
994 | static unsigned long last_gc; | |
995 | unsigned long now = jiffies; | |
996 | ||
997 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
998 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
999 | goto out; | |
1000 | ||
1001 | expire++; | |
1002 | fib6_run_gc(expire); | |
1003 | last_gc = now; | |
1004 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
1005 | expire = ip6_rt_gc_timeout>>1; | |
1006 | ||
1007 | out: | |
1008 | expire -= expire>>ip6_rt_gc_elasticity; | |
1009 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
1010 | } | |
1011 | ||
1012 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1013 | but results in cleaner routing tables. | |
1014 | ||
1015 | Remove it only when all the things will work! | |
1016 | */ | |
1017 | ||
1018 | static int ipv6_get_mtu(struct net_device *dev) | |
1019 | { | |
1020 | int mtu = IPV6_MIN_MTU; | |
1021 | struct inet6_dev *idev; | |
1022 | ||
1023 | idev = in6_dev_get(dev); | |
1024 | if (idev) { | |
1025 | mtu = idev->cnf.mtu6; | |
1026 | in6_dev_put(idev); | |
1027 | } | |
1028 | return mtu; | |
1029 | } | |
1030 | ||
1031 | int ipv6_get_hoplimit(struct net_device *dev) | |
1032 | { | |
1033 | int hoplimit = ipv6_devconf.hop_limit; | |
1034 | struct inet6_dev *idev; | |
1035 | ||
1036 | idev = in6_dev_get(dev); | |
1037 | if (idev) { | |
1038 | hoplimit = idev->cnf.hop_limit; | |
1039 | in6_dev_put(idev); | |
1040 | } | |
1041 | return hoplimit; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * | |
1046 | */ | |
1047 | ||
86872cb5 | 1048 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1049 | { |
1050 | int err; | |
1da177e4 LT |
1051 | struct rt6_info *rt = NULL; |
1052 | struct net_device *dev = NULL; | |
1053 | struct inet6_dev *idev = NULL; | |
c71099ac | 1054 | struct fib6_table *table; |
1da177e4 LT |
1055 | int addr_type; |
1056 | ||
86872cb5 | 1057 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1058 | return -EINVAL; |
1059 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1060 | if (cfg->fc_src_len) |
1da177e4 LT |
1061 | return -EINVAL; |
1062 | #endif | |
86872cb5 | 1063 | if (cfg->fc_ifindex) { |
1da177e4 | 1064 | err = -ENODEV; |
881d966b | 1065 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
1da177e4 LT |
1066 | if (!dev) |
1067 | goto out; | |
1068 | idev = in6_dev_get(dev); | |
1069 | if (!idev) | |
1070 | goto out; | |
1071 | } | |
1072 | ||
86872cb5 TG |
1073 | if (cfg->fc_metric == 0) |
1074 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1075 | |
86872cb5 | 1076 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1077 | if (table == NULL) { |
1078 | err = -ENOBUFS; | |
1079 | goto out; | |
1080 | } | |
1081 | ||
1da177e4 LT |
1082 | rt = ip6_dst_alloc(); |
1083 | ||
1084 | if (rt == NULL) { | |
1085 | err = -ENOMEM; | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1089 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1090 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1091 | |
86872cb5 TG |
1092 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1093 | cfg->fc_protocol = RTPROT_BOOT; | |
1094 | rt->rt6i_protocol = cfg->fc_protocol; | |
1095 | ||
1096 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1097 | |
1098 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1099 | rt->u.dst.input = ip6_mc_input; | |
1100 | else | |
1101 | rt->u.dst.input = ip6_forward; | |
1102 | ||
1103 | rt->u.dst.output = ip6_output; | |
1104 | ||
86872cb5 TG |
1105 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1106 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1107 | if (rt->rt6i_dst.plen == 128) |
1108 | rt->u.dst.flags = DST_HOST; | |
1109 | ||
1110 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1111 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1112 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1113 | #endif |
1114 | ||
86872cb5 | 1115 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1116 | |
1117 | /* We cannot add true routes via loopback here, | |
1118 | they would result in kernel looping; promote them to reject routes | |
1119 | */ | |
86872cb5 | 1120 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1121 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1122 | /* hold loopback dev/idev if we haven't done so. */ | |
2774c7ab | 1123 | if (dev != init_net.loopback_dev) { |
1da177e4 LT |
1124 | if (dev) { |
1125 | dev_put(dev); | |
1126 | in6_dev_put(idev); | |
1127 | } | |
2774c7ab | 1128 | dev = init_net.loopback_dev; |
1da177e4 LT |
1129 | dev_hold(dev); |
1130 | idev = in6_dev_get(dev); | |
1131 | if (!idev) { | |
1132 | err = -ENODEV; | |
1133 | goto out; | |
1134 | } | |
1135 | } | |
1136 | rt->u.dst.output = ip6_pkt_discard_out; | |
1137 | rt->u.dst.input = ip6_pkt_discard; | |
1138 | rt->u.dst.error = -ENETUNREACH; | |
1139 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1140 | goto install_route; | |
1141 | } | |
1142 | ||
86872cb5 | 1143 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1144 | struct in6_addr *gw_addr; |
1145 | int gwa_type; | |
1146 | ||
86872cb5 TG |
1147 | gw_addr = &cfg->fc_gateway; |
1148 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1149 | gwa_type = ipv6_addr_type(gw_addr); |
1150 | ||
1151 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1152 | struct rt6_info *grt; | |
1153 | ||
1154 | /* IPv6 strictly inhibits using not link-local | |
1155 | addresses as nexthop address. | |
1156 | Otherwise, router will not able to send redirects. | |
1157 | It is very good, but in some (rare!) circumstances | |
1158 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1159 | some exceptions. --ANK | |
1160 | */ | |
1161 | err = -EINVAL; | |
1162 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1163 | goto out; | |
1164 | ||
86872cb5 | 1165 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1166 | |
1167 | err = -EHOSTUNREACH; | |
1168 | if (grt == NULL) | |
1169 | goto out; | |
1170 | if (dev) { | |
1171 | if (dev != grt->rt6i_dev) { | |
1172 | dst_release(&grt->u.dst); | |
1173 | goto out; | |
1174 | } | |
1175 | } else { | |
1176 | dev = grt->rt6i_dev; | |
1177 | idev = grt->rt6i_idev; | |
1178 | dev_hold(dev); | |
1179 | in6_dev_hold(grt->rt6i_idev); | |
1180 | } | |
1181 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1182 | err = 0; | |
1183 | dst_release(&grt->u.dst); | |
1184 | ||
1185 | if (err) | |
1186 | goto out; | |
1187 | } | |
1188 | err = -EINVAL; | |
1189 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1190 | goto out; | |
1191 | } | |
1192 | ||
1193 | err = -ENODEV; | |
1194 | if (dev == NULL) | |
1195 | goto out; | |
1196 | ||
86872cb5 | 1197 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1198 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1199 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1200 | err = PTR_ERR(rt->rt6i_nexthop); | |
1201 | rt->rt6i_nexthop = NULL; | |
1202 | goto out; | |
1203 | } | |
1204 | } | |
1205 | ||
86872cb5 | 1206 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1207 | |
1208 | install_route: | |
86872cb5 TG |
1209 | if (cfg->fc_mx) { |
1210 | struct nlattr *nla; | |
1211 | int remaining; | |
1212 | ||
1213 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1214 | int type = nla_type(nla); |
86872cb5 TG |
1215 | |
1216 | if (type) { | |
1217 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1218 | err = -EINVAL; |
1219 | goto out; | |
1220 | } | |
86872cb5 TG |
1221 | |
1222 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1223 | } |
1da177e4 LT |
1224 | } |
1225 | } | |
1226 | ||
1227 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1228 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1229 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1230 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1231 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1232 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1233 | rt->u.dst.dev = dev; | |
1234 | rt->rt6i_idev = idev; | |
c71099ac | 1235 | rt->rt6i_table = table; |
86872cb5 | 1236 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1237 | |
1238 | out: | |
1239 | if (dev) | |
1240 | dev_put(dev); | |
1241 | if (idev) | |
1242 | in6_dev_put(idev); | |
1243 | if (rt) | |
40aa7b90 | 1244 | dst_free(&rt->u.dst); |
1da177e4 LT |
1245 | return err; |
1246 | } | |
1247 | ||
86872cb5 | 1248 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1249 | { |
1250 | int err; | |
c71099ac | 1251 | struct fib6_table *table; |
1da177e4 | 1252 | |
6c813a72 PM |
1253 | if (rt == &ip6_null_entry) |
1254 | return -ENOENT; | |
1255 | ||
c71099ac TG |
1256 | table = rt->rt6i_table; |
1257 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1258 | |
86872cb5 | 1259 | err = fib6_del(rt, info); |
1da177e4 LT |
1260 | dst_release(&rt->u.dst); |
1261 | ||
c71099ac | 1262 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1263 | |
1264 | return err; | |
1265 | } | |
1266 | ||
e0a1ad73 TG |
1267 | int ip6_del_rt(struct rt6_info *rt) |
1268 | { | |
86872cb5 | 1269 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1270 | } |
1271 | ||
86872cb5 | 1272 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1273 | { |
c71099ac | 1274 | struct fib6_table *table; |
1da177e4 LT |
1275 | struct fib6_node *fn; |
1276 | struct rt6_info *rt; | |
1277 | int err = -ESRCH; | |
1278 | ||
86872cb5 | 1279 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1280 | if (table == NULL) |
1281 | return err; | |
1282 | ||
1283 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1284 | |
c71099ac | 1285 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1286 | &cfg->fc_dst, cfg->fc_dst_len, |
1287 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1288 | |
1da177e4 | 1289 | if (fn) { |
7cc48263 | 1290 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1291 | if (cfg->fc_ifindex && |
1da177e4 | 1292 | (rt->rt6i_dev == NULL || |
86872cb5 | 1293 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1294 | continue; |
86872cb5 TG |
1295 | if (cfg->fc_flags & RTF_GATEWAY && |
1296 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1297 | continue; |
86872cb5 | 1298 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1299 | continue; |
1300 | dst_hold(&rt->u.dst); | |
c71099ac | 1301 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1302 | |
86872cb5 | 1303 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1304 | } |
1305 | } | |
c71099ac | 1306 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1307 | |
1308 | return err; | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * Handle redirects | |
1313 | */ | |
a6279458 YH |
1314 | struct ip6rd_flowi { |
1315 | struct flowi fl; | |
1316 | struct in6_addr gateway; | |
1317 | }; | |
1318 | ||
1319 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1320 | struct flowi *fl, | |
1321 | int flags) | |
1da177e4 | 1322 | { |
a6279458 YH |
1323 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1324 | struct rt6_info *rt; | |
e843b9e1 | 1325 | struct fib6_node *fn; |
c71099ac | 1326 | |
1da177e4 | 1327 | /* |
e843b9e1 YH |
1328 | * Get the "current" route for this destination and |
1329 | * check if the redirect has come from approriate router. | |
1330 | * | |
1331 | * RFC 2461 specifies that redirects should only be | |
1332 | * accepted if they come from the nexthop to the target. | |
1333 | * Due to the way the routes are chosen, this notion | |
1334 | * is a bit fuzzy and one might need to check all possible | |
1335 | * routes. | |
1da177e4 | 1336 | */ |
1da177e4 | 1337 | |
c71099ac | 1338 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1339 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1340 | restart: |
7cc48263 | 1341 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1342 | /* |
1343 | * Current route is on-link; redirect is always invalid. | |
1344 | * | |
1345 | * Seems, previous statement is not true. It could | |
1346 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1347 | * But then router serving it might decide, that we should | |
1348 | * know truth 8)8) --ANK (980726). | |
1349 | */ | |
1350 | if (rt6_check_expired(rt)) | |
1351 | continue; | |
1352 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1353 | continue; | |
a6279458 | 1354 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1355 | continue; |
a6279458 | 1356 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1357 | continue; |
1358 | break; | |
1359 | } | |
a6279458 | 1360 | |
cb15d9c2 | 1361 | if (!rt) |
a6279458 | 1362 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1363 | BACKTRACK(&fl->fl6_src); |
1364 | out: | |
a6279458 YH |
1365 | dst_hold(&rt->u.dst); |
1366 | ||
c71099ac | 1367 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1368 | |
a6279458 YH |
1369 | return rt; |
1370 | }; | |
1371 | ||
1372 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1373 | struct in6_addr *src, | |
1374 | struct in6_addr *gateway, | |
1375 | struct net_device *dev) | |
1376 | { | |
adaa70bb | 1377 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1378 | struct ip6rd_flowi rdfl = { |
1379 | .fl = { | |
1380 | .oif = dev->ifindex, | |
1381 | .nl_u = { | |
1382 | .ip6_u = { | |
1383 | .daddr = *dest, | |
1384 | .saddr = *src, | |
1385 | }, | |
1386 | }, | |
1387 | }, | |
1388 | .gateway = *gateway, | |
1389 | }; | |
adaa70bb TG |
1390 | |
1391 | if (rt6_need_strict(dest)) | |
1392 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1393 | |
1394 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1395 | } | |
1396 | ||
1397 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1398 | struct in6_addr *saddr, | |
1399 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1400 | { | |
1401 | struct rt6_info *rt, *nrt = NULL; | |
1402 | struct netevent_redirect netevent; | |
1403 | ||
1404 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1405 | ||
1406 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1407 | if (net_ratelimit()) |
1408 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1409 | "for redirect target\n"); | |
a6279458 | 1410 | goto out; |
1da177e4 LT |
1411 | } |
1412 | ||
1da177e4 LT |
1413 | /* |
1414 | * We have finally decided to accept it. | |
1415 | */ | |
1416 | ||
1ab1457c | 1417 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1418 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1419 | NEIGH_UPDATE_F_OVERRIDE| | |
1420 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1421 | NEIGH_UPDATE_F_ISROUTER)) | |
1422 | ); | |
1423 | ||
1424 | /* | |
1425 | * Redirect received -> path was valid. | |
1426 | * Look, redirects are sent only in response to data packets, | |
1427 | * so that this nexthop apparently is reachable. --ANK | |
1428 | */ | |
1429 | dst_confirm(&rt->u.dst); | |
1430 | ||
1431 | /* Duplicate redirect: silently ignore. */ | |
1432 | if (neigh == rt->u.dst.neighbour) | |
1433 | goto out; | |
1434 | ||
1435 | nrt = ip6_rt_copy(rt); | |
1436 | if (nrt == NULL) | |
1437 | goto out; | |
1438 | ||
1439 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1440 | if (on_link) | |
1441 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1442 | ||
1443 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1444 | nrt->rt6i_dst.plen = 128; | |
1445 | nrt->u.dst.flags |= DST_HOST; | |
1446 | ||
1447 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1448 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1449 | /* Reset pmtu, it may be better */ | |
1450 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1451 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1452 | ||
40e22e8f | 1453 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1454 | goto out; |
1455 | ||
8d71740c TT |
1456 | netevent.old = &rt->u.dst; |
1457 | netevent.new = &nrt->u.dst; | |
1458 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1459 | ||
1da177e4 | 1460 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1461 | ip6_del_rt(rt); |
1da177e4 LT |
1462 | return; |
1463 | } | |
1464 | ||
1465 | out: | |
1ab1457c | 1466 | dst_release(&rt->u.dst); |
1da177e4 LT |
1467 | return; |
1468 | } | |
1469 | ||
1470 | /* | |
1471 | * Handle ICMP "packet too big" messages | |
1472 | * i.e. Path MTU discovery | |
1473 | */ | |
1474 | ||
1475 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1476 | struct net_device *dev, u32 pmtu) | |
1477 | { | |
1478 | struct rt6_info *rt, *nrt; | |
1479 | int allfrag = 0; | |
1480 | ||
1481 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1482 | if (rt == NULL) | |
1483 | return; | |
1484 | ||
1485 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1486 | goto out; | |
1487 | ||
1488 | if (pmtu < IPV6_MIN_MTU) { | |
1489 | /* | |
1ab1457c | 1490 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1491 | * MTU (1280) and a fragment header should always be included |
1492 | * after a node receiving Too Big message reporting PMTU is | |
1493 | * less than the IPv6 Minimum Link MTU. | |
1494 | */ | |
1495 | pmtu = IPV6_MIN_MTU; | |
1496 | allfrag = 1; | |
1497 | } | |
1498 | ||
1499 | /* New mtu received -> path was valid. | |
1500 | They are sent only in response to data packets, | |
1501 | so that this nexthop apparently is reachable. --ANK | |
1502 | */ | |
1503 | dst_confirm(&rt->u.dst); | |
1504 | ||
1505 | /* Host route. If it is static, it would be better | |
1506 | not to override it, but add new one, so that | |
1507 | when cache entry will expire old pmtu | |
1508 | would return automatically. | |
1509 | */ | |
1510 | if (rt->rt6i_flags & RTF_CACHE) { | |
1511 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1512 | if (allfrag) | |
1513 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1514 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1515 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1516 | goto out; | |
1517 | } | |
1518 | ||
1519 | /* Network route. | |
1520 | Two cases are possible: | |
1521 | 1. It is connected route. Action: COW | |
1522 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1523 | */ | |
d5315b50 | 1524 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1525 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1526 | else |
1527 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1528 | |
d5315b50 | 1529 | if (nrt) { |
a1e78363 YH |
1530 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1531 | if (allfrag) | |
1532 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1533 | ||
1534 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1535 | * happened within 5 mins, the recommended timer is 10 mins. | |
1536 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1537 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1538 | * and detecting PMTU increase will be automatically happened. | |
1539 | */ | |
1540 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1541 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1542 | ||
40e22e8f | 1543 | ip6_ins_rt(nrt); |
1da177e4 | 1544 | } |
1da177e4 LT |
1545 | out: |
1546 | dst_release(&rt->u.dst); | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * Misc support functions | |
1551 | */ | |
1552 | ||
1553 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1554 | { | |
1555 | struct rt6_info *rt = ip6_dst_alloc(); | |
1556 | ||
1557 | if (rt) { | |
1558 | rt->u.dst.input = ort->u.dst.input; | |
1559 | rt->u.dst.output = ort->u.dst.output; | |
1560 | ||
1561 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1562 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1563 | rt->u.dst.dev = ort->u.dst.dev; |
1564 | if (rt->u.dst.dev) | |
1565 | dev_hold(rt->u.dst.dev); | |
1566 | rt->rt6i_idev = ort->rt6i_idev; | |
1567 | if (rt->rt6i_idev) | |
1568 | in6_dev_hold(rt->rt6i_idev); | |
1569 | rt->u.dst.lastuse = jiffies; | |
1570 | rt->rt6i_expires = 0; | |
1571 | ||
1572 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1573 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1574 | rt->rt6i_metric = 0; | |
1575 | ||
1576 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1577 | #ifdef CONFIG_IPV6_SUBTREES | |
1578 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1579 | #endif | |
c71099ac | 1580 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1581 | } |
1582 | return rt; | |
1583 | } | |
1584 | ||
70ceb4f5 YH |
1585 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1586 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1587 | struct in6_addr *gwaddr, int ifindex) | |
1588 | { | |
1589 | struct fib6_node *fn; | |
1590 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1591 | struct fib6_table *table; |
1592 | ||
1593 | table = fib6_get_table(RT6_TABLE_INFO); | |
1594 | if (table == NULL) | |
1595 | return NULL; | |
70ceb4f5 | 1596 | |
c71099ac TG |
1597 | write_lock_bh(&table->tb6_lock); |
1598 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1599 | if (!fn) |
1600 | goto out; | |
1601 | ||
7cc48263 | 1602 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1603 | if (rt->rt6i_dev->ifindex != ifindex) |
1604 | continue; | |
1605 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1606 | continue; | |
1607 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1608 | continue; | |
1609 | dst_hold(&rt->u.dst); | |
1610 | break; | |
1611 | } | |
1612 | out: | |
c71099ac | 1613 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1614 | return rt; |
1615 | } | |
1616 | ||
1617 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1618 | struct in6_addr *gwaddr, int ifindex, | |
1619 | unsigned pref) | |
1620 | { | |
86872cb5 TG |
1621 | struct fib6_config cfg = { |
1622 | .fc_table = RT6_TABLE_INFO, | |
1623 | .fc_metric = 1024, | |
1624 | .fc_ifindex = ifindex, | |
1625 | .fc_dst_len = prefixlen, | |
1626 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1627 | RTF_UP | RTF_PREF(pref), | |
1628 | }; | |
1629 | ||
1630 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1631 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1632 | |
e317da96 YH |
1633 | /* We should treat it as a default route if prefix length is 0. */ |
1634 | if (!prefixlen) | |
86872cb5 | 1635 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1636 | |
86872cb5 | 1637 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1638 | |
1639 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1640 | } | |
1641 | #endif | |
1642 | ||
1da177e4 | 1643 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1644 | { |
1da177e4 | 1645 | struct rt6_info *rt; |
c71099ac | 1646 | struct fib6_table *table; |
1da177e4 | 1647 | |
c71099ac TG |
1648 | table = fib6_get_table(RT6_TABLE_DFLT); |
1649 | if (table == NULL) | |
1650 | return NULL; | |
1da177e4 | 1651 | |
c71099ac | 1652 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1653 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1654 | if (dev == rt->rt6i_dev && |
045927ff | 1655 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1656 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1657 | break; | |
1658 | } | |
1659 | if (rt) | |
1660 | dst_hold(&rt->u.dst); | |
c71099ac | 1661 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1662 | return rt; |
1663 | } | |
1664 | ||
c7dc89c0 FT |
1665 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1666 | ||
1da177e4 | 1667 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1668 | struct net_device *dev, |
1669 | unsigned int pref) | |
1da177e4 | 1670 | { |
86872cb5 TG |
1671 | struct fib6_config cfg = { |
1672 | .fc_table = RT6_TABLE_DFLT, | |
1673 | .fc_metric = 1024, | |
1674 | .fc_ifindex = dev->ifindex, | |
1675 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1676 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1677 | }; | |
1da177e4 | 1678 | |
86872cb5 | 1679 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1680 | |
86872cb5 | 1681 | ip6_route_add(&cfg); |
1da177e4 | 1682 | |
1da177e4 LT |
1683 | return rt6_get_dflt_router(gwaddr, dev); |
1684 | } | |
1685 | ||
1686 | void rt6_purge_dflt_routers(void) | |
1687 | { | |
1688 | struct rt6_info *rt; | |
c71099ac TG |
1689 | struct fib6_table *table; |
1690 | ||
1691 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1692 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1693 | if (table == NULL) | |
1694 | return; | |
1da177e4 LT |
1695 | |
1696 | restart: | |
c71099ac | 1697 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1698 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1699 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1700 | dst_hold(&rt->u.dst); | |
c71099ac | 1701 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1702 | ip6_del_rt(rt); |
1da177e4 LT |
1703 | goto restart; |
1704 | } | |
1705 | } | |
c71099ac | 1706 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1707 | } |
1708 | ||
86872cb5 TG |
1709 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1710 | struct fib6_config *cfg) | |
1711 | { | |
1712 | memset(cfg, 0, sizeof(*cfg)); | |
1713 | ||
1714 | cfg->fc_table = RT6_TABLE_MAIN; | |
1715 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1716 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1717 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1718 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1719 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1720 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1721 | ||
1722 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1723 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1724 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1725 | } | |
1726 | ||
1da177e4 LT |
1727 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1728 | { | |
86872cb5 | 1729 | struct fib6_config cfg; |
1da177e4 LT |
1730 | struct in6_rtmsg rtmsg; |
1731 | int err; | |
1732 | ||
1733 | switch(cmd) { | |
1734 | case SIOCADDRT: /* Add a route */ | |
1735 | case SIOCDELRT: /* Delete a route */ | |
1736 | if (!capable(CAP_NET_ADMIN)) | |
1737 | return -EPERM; | |
1738 | err = copy_from_user(&rtmsg, arg, | |
1739 | sizeof(struct in6_rtmsg)); | |
1740 | if (err) | |
1741 | return -EFAULT; | |
86872cb5 TG |
1742 | |
1743 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1744 | ||
1da177e4 LT |
1745 | rtnl_lock(); |
1746 | switch (cmd) { | |
1747 | case SIOCADDRT: | |
86872cb5 | 1748 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1749 | break; |
1750 | case SIOCDELRT: | |
86872cb5 | 1751 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1752 | break; |
1753 | default: | |
1754 | err = -EINVAL; | |
1755 | } | |
1756 | rtnl_unlock(); | |
1757 | ||
1758 | return err; | |
3ff50b79 | 1759 | } |
1da177e4 LT |
1760 | |
1761 | return -EINVAL; | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * Drop the packet on the floor | |
1766 | */ | |
1767 | ||
612f09e8 YH |
1768 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, |
1769 | 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) && | |
1ab1457c YH |
1913 | (dst_mtu(&rt->u.dst) > arg->mtu || |
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; | |
1966 | ||
1967 | if (tb[RTA_GATEWAY]) { | |
1968 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1969 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1970 | } |
86872cb5 TG |
1971 | |
1972 | if (tb[RTA_DST]) { | |
1973 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1974 | ||
1975 | if (nla_len(tb[RTA_DST]) < plen) | |
1976 | goto errout; | |
1977 | ||
1978 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1979 | } |
86872cb5 TG |
1980 | |
1981 | if (tb[RTA_SRC]) { | |
1982 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1983 | ||
1984 | if (nla_len(tb[RTA_SRC]) < plen) | |
1985 | goto errout; | |
1986 | ||
1987 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1988 | } |
86872cb5 TG |
1989 | |
1990 | if (tb[RTA_OIF]) | |
1991 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1992 | ||
1993 | if (tb[RTA_PRIORITY]) | |
1994 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
1995 | ||
1996 | if (tb[RTA_METRICS]) { | |
1997 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
1998 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 1999 | } |
86872cb5 TG |
2000 | |
2001 | if (tb[RTA_TABLE]) | |
2002 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2003 | ||
2004 | err = 0; | |
2005 | errout: | |
2006 | return err; | |
1da177e4 LT |
2007 | } |
2008 | ||
c127ea2c | 2009 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2010 | { |
b854272b | 2011 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2012 | struct fib6_config cfg; |
2013 | int err; | |
1da177e4 | 2014 | |
b854272b DL |
2015 | if (net != &init_net) |
2016 | return -EINVAL; | |
2017 | ||
86872cb5 TG |
2018 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2019 | if (err < 0) | |
2020 | return err; | |
2021 | ||
2022 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2023 | } |
2024 | ||
c127ea2c | 2025 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2026 | { |
b854272b | 2027 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2028 | struct fib6_config cfg; |
2029 | int err; | |
1da177e4 | 2030 | |
b854272b DL |
2031 | if (net != &init_net) |
2032 | return -EINVAL; | |
2033 | ||
86872cb5 TG |
2034 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2035 | if (err < 0) | |
2036 | return err; | |
2037 | ||
2038 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2039 | } |
2040 | ||
339bf98f TG |
2041 | static inline size_t rt6_nlmsg_size(void) |
2042 | { | |
2043 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2044 | + nla_total_size(16) /* RTA_SRC */ | |
2045 | + nla_total_size(16) /* RTA_DST */ | |
2046 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2047 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2048 | + nla_total_size(4) /* RTA_TABLE */ | |
2049 | + nla_total_size(4) /* RTA_IIF */ | |
2050 | + nla_total_size(4) /* RTA_OIF */ | |
2051 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2052 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2053 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2054 | } | |
2055 | ||
1da177e4 | 2056 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2057 | struct in6_addr *dst, struct in6_addr *src, |
2058 | int iif, int type, u32 pid, u32 seq, | |
2059 | int prefix, unsigned int flags) | |
1da177e4 LT |
2060 | { |
2061 | struct rtmsg *rtm; | |
2d7202bf | 2062 | struct nlmsghdr *nlh; |
e3703b3d | 2063 | long expires; |
9e762a4a | 2064 | u32 table; |
1da177e4 LT |
2065 | |
2066 | if (prefix) { /* user wants prefix routes only */ | |
2067 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2068 | /* success since this is not a prefix route */ | |
2069 | return 1; | |
2070 | } | |
2071 | } | |
2072 | ||
2d7202bf TG |
2073 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2074 | if (nlh == NULL) | |
26932566 | 2075 | return -EMSGSIZE; |
2d7202bf TG |
2076 | |
2077 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2078 | rtm->rtm_family = AF_INET6; |
2079 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2080 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2081 | rtm->rtm_tos = 0; | |
c71099ac | 2082 | if (rt->rt6i_table) |
9e762a4a | 2083 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2084 | else |
9e762a4a PM |
2085 | table = RT6_TABLE_UNSPEC; |
2086 | rtm->rtm_table = table; | |
2d7202bf | 2087 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2088 | if (rt->rt6i_flags&RTF_REJECT) |
2089 | rtm->rtm_type = RTN_UNREACHABLE; | |
2090 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2091 | rtm->rtm_type = RTN_LOCAL; | |
2092 | else | |
2093 | rtm->rtm_type = RTN_UNICAST; | |
2094 | rtm->rtm_flags = 0; | |
2095 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2096 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2097 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2098 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2099 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2100 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2101 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2102 | rtm->rtm_protocol = RTPROT_RA; | |
2103 | ||
2104 | if (rt->rt6i_flags&RTF_CACHE) | |
2105 | rtm->rtm_flags |= RTM_F_CLONED; | |
2106 | ||
2107 | if (dst) { | |
2d7202bf | 2108 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2109 | rtm->rtm_dst_len = 128; |
1da177e4 | 2110 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2111 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2112 | #ifdef CONFIG_IPV6_SUBTREES |
2113 | if (src) { | |
2d7202bf | 2114 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2115 | rtm->rtm_src_len = 128; |
1da177e4 | 2116 | } else if (rtm->rtm_src_len) |
2d7202bf | 2117 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2118 | #endif |
2119 | if (iif) | |
2d7202bf | 2120 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2121 | else if (dst) { |
2122 | struct in6_addr saddr_buf; | |
2123 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2124 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2125 | } |
2d7202bf | 2126 | |
1da177e4 | 2127 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2128 | goto nla_put_failure; |
2129 | ||
1da177e4 | 2130 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2131 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2132 | ||
1da177e4 | 2133 | if (rt->u.dst.dev) |
2d7202bf TG |
2134 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2135 | ||
2136 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2137 | |
2138 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2139 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2140 | expires, rt->u.dst.error) < 0) | |
2141 | goto nla_put_failure; | |
2d7202bf TG |
2142 | |
2143 | return nlmsg_end(skb, nlh); | |
2144 | ||
2145 | nla_put_failure: | |
26932566 PM |
2146 | nlmsg_cancel(skb, nlh); |
2147 | return -EMSGSIZE; | |
1da177e4 LT |
2148 | } |
2149 | ||
1b43af54 | 2150 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2151 | { |
2152 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2153 | int prefix; | |
2154 | ||
2d7202bf TG |
2155 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2156 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2157 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2158 | } else | |
2159 | prefix = 0; | |
2160 | ||
2161 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2162 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2163 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2164 | } |
2165 | ||
c127ea2c | 2166 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2167 | { |
b854272b | 2168 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2169 | struct nlattr *tb[RTA_MAX+1]; |
2170 | struct rt6_info *rt; | |
1da177e4 | 2171 | struct sk_buff *skb; |
ab364a6f | 2172 | struct rtmsg *rtm; |
1da177e4 | 2173 | struct flowi fl; |
ab364a6f | 2174 | int err, iif = 0; |
1da177e4 | 2175 | |
b854272b DL |
2176 | if (net != &init_net) |
2177 | return -EINVAL; | |
2178 | ||
ab364a6f TG |
2179 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2180 | if (err < 0) | |
2181 | goto errout; | |
1da177e4 | 2182 | |
ab364a6f | 2183 | err = -EINVAL; |
1da177e4 | 2184 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2185 | |
ab364a6f TG |
2186 | if (tb[RTA_SRC]) { |
2187 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2188 | goto errout; | |
2189 | ||
2190 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2191 | } | |
2192 | ||
2193 | if (tb[RTA_DST]) { | |
2194 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2195 | goto errout; | |
2196 | ||
2197 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2198 | } | |
2199 | ||
2200 | if (tb[RTA_IIF]) | |
2201 | iif = nla_get_u32(tb[RTA_IIF]); | |
2202 | ||
2203 | if (tb[RTA_OIF]) | |
2204 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2205 | |
2206 | if (iif) { | |
2207 | struct net_device *dev; | |
881d966b | 2208 | dev = __dev_get_by_index(&init_net, iif); |
1da177e4 LT |
2209 | if (!dev) { |
2210 | err = -ENODEV; | |
ab364a6f | 2211 | goto errout; |
1da177e4 LT |
2212 | } |
2213 | } | |
2214 | ||
ab364a6f TG |
2215 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2216 | if (skb == NULL) { | |
2217 | err = -ENOBUFS; | |
2218 | goto errout; | |
2219 | } | |
1da177e4 | 2220 | |
ab364a6f TG |
2221 | /* Reserve room for dummy headers, this skb can pass |
2222 | through good chunk of routing engine. | |
2223 | */ | |
459a98ed | 2224 | skb_reset_mac_header(skb); |
ab364a6f | 2225 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2226 | |
ab364a6f | 2227 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2228 | skb->dst = &rt->u.dst; |
2229 | ||
ab364a6f | 2230 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2231 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2232 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2233 | if (err < 0) { |
ab364a6f TG |
2234 | kfree_skb(skb); |
2235 | goto errout; | |
1da177e4 LT |
2236 | } |
2237 | ||
97c53cac | 2238 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2239 | errout: |
1da177e4 | 2240 | return err; |
1da177e4 LT |
2241 | } |
2242 | ||
86872cb5 | 2243 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2244 | { |
2245 | struct sk_buff *skb; | |
86872cb5 TG |
2246 | u32 pid = 0, seq = 0; |
2247 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2248 | int err = -ENOBUFS; |
2249 | ||
86872cb5 TG |
2250 | if (info) { |
2251 | pid = info->pid; | |
2252 | nlh = info->nlh; | |
2253 | if (nlh) | |
2254 | seq = nlh->nlmsg_seq; | |
2255 | } | |
2256 | ||
339bf98f | 2257 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2258 | if (skb == NULL) |
2259 | goto errout; | |
2260 | ||
2261 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
26932566 PM |
2262 | if (err < 0) { |
2263 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2264 | WARN_ON(err == -EMSGSIZE); | |
2265 | kfree_skb(skb); | |
2266 | goto errout; | |
2267 | } | |
97c53cac | 2268 | err = rtnl_notify(skb, &init_net, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); |
21713ebc TG |
2269 | errout: |
2270 | if (err < 0) | |
97c53cac | 2271 | rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2272 | } |
2273 | ||
2274 | /* | |
2275 | * /proc | |
2276 | */ | |
2277 | ||
2278 | #ifdef CONFIG_PROC_FS | |
2279 | ||
2280 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2281 | ||
2282 | struct rt6_proc_arg | |
2283 | { | |
2284 | char *buffer; | |
2285 | int offset; | |
2286 | int length; | |
2287 | int skip; | |
2288 | int len; | |
2289 | }; | |
2290 | ||
2291 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2292 | { | |
33120b30 | 2293 | struct seq_file *m = p_arg; |
1da177e4 | 2294 | |
33120b30 AD |
2295 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2296 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2297 | |
2298 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2299 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2300 | rt->rt6i_src.plen); | |
1da177e4 | 2301 | #else |
33120b30 | 2302 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2303 | #endif |
2304 | ||
2305 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2306 | seq_printf(m, NIP6_SEQFMT, |
2307 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2308 | } else { |
33120b30 | 2309 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2310 | } |
33120b30 AD |
2311 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2312 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2313 | rt->u.dst.__use, rt->rt6i_flags, | |
2314 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2315 | return 0; |
2316 | } | |
2317 | ||
33120b30 | 2318 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2319 | { |
33120b30 AD |
2320 | fib6_clean_all(rt6_info_route, 0, m); |
2321 | return 0; | |
2322 | } | |
1da177e4 | 2323 | |
33120b30 AD |
2324 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2325 | { | |
2326 | return single_open(file, ipv6_route_show, NULL); | |
1da177e4 LT |
2327 | } |
2328 | ||
33120b30 AD |
2329 | static const struct file_operations ipv6_route_proc_fops = { |
2330 | .owner = THIS_MODULE, | |
2331 | .open = ipv6_route_open, | |
2332 | .read = seq_read, | |
2333 | .llseek = seq_lseek, | |
2334 | .release = single_release, | |
2335 | }; | |
2336 | ||
1da177e4 LT |
2337 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2338 | { | |
2339 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2340 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2341 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2342 | rt6_stats.fib_rt_cache, | |
2343 | atomic_read(&ip6_dst_ops.entries), | |
2344 | rt6_stats.fib_discarded_routes); | |
2345 | ||
2346 | return 0; | |
2347 | } | |
2348 | ||
2349 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2350 | { | |
2351 | return single_open(file, rt6_stats_seq_show, NULL); | |
2352 | } | |
2353 | ||
9a32144e | 2354 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2355 | .owner = THIS_MODULE, |
2356 | .open = rt6_stats_seq_open, | |
2357 | .read = seq_read, | |
2358 | .llseek = seq_lseek, | |
2359 | .release = single_release, | |
2360 | }; | |
2361 | #endif /* CONFIG_PROC_FS */ | |
2362 | ||
2363 | #ifdef CONFIG_SYSCTL | |
2364 | ||
2365 | static int flush_delay; | |
2366 | ||
2367 | static | |
2368 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2369 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2370 | { | |
2371 | if (write) { | |
2372 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2373 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2374 | return 0; | |
2375 | } else | |
2376 | return -EINVAL; | |
2377 | } | |
2378 | ||
2379 | ctl_table ipv6_route_table[] = { | |
1ab1457c | 2380 | { |
1da177e4 | 2381 | .procname = "flush", |
1ab1457c | 2382 | .data = &flush_delay, |
1da177e4 | 2383 | .maxlen = sizeof(int), |
89c8b3a1 | 2384 | .mode = 0200, |
1ab1457c | 2385 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2386 | }, |
2387 | { | |
2388 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2389 | .procname = "gc_thresh", | |
1ab1457c | 2390 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2391 | .maxlen = sizeof(int), |
2392 | .mode = 0644, | |
1ab1457c | 2393 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2394 | }, |
2395 | { | |
2396 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2397 | .procname = "max_size", | |
1ab1457c | 2398 | .data = &ip6_rt_max_size, |
1da177e4 LT |
2399 | .maxlen = sizeof(int), |
2400 | .mode = 0644, | |
1ab1457c | 2401 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2402 | }, |
2403 | { | |
2404 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2405 | .procname = "gc_min_interval", | |
1ab1457c | 2406 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2407 | .maxlen = sizeof(int), |
2408 | .mode = 0644, | |
1ab1457c | 2409 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2410 | .strategy = &sysctl_jiffies, |
2411 | }, | |
2412 | { | |
2413 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2414 | .procname = "gc_timeout", | |
1ab1457c | 2415 | .data = &ip6_rt_gc_timeout, |
1da177e4 LT |
2416 | .maxlen = sizeof(int), |
2417 | .mode = 0644, | |
1ab1457c | 2418 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2419 | .strategy = &sysctl_jiffies, |
2420 | }, | |
2421 | { | |
2422 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2423 | .procname = "gc_interval", | |
1ab1457c | 2424 | .data = &ip6_rt_gc_interval, |
1da177e4 LT |
2425 | .maxlen = sizeof(int), |
2426 | .mode = 0644, | |
1ab1457c | 2427 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2428 | .strategy = &sysctl_jiffies, |
2429 | }, | |
2430 | { | |
2431 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2432 | .procname = "gc_elasticity", | |
1ab1457c | 2433 | .data = &ip6_rt_gc_elasticity, |
1da177e4 LT |
2434 | .maxlen = sizeof(int), |
2435 | .mode = 0644, | |
1ab1457c | 2436 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2437 | .strategy = &sysctl_jiffies, |
2438 | }, | |
2439 | { | |
2440 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2441 | .procname = "mtu_expires", | |
1ab1457c | 2442 | .data = &ip6_rt_mtu_expires, |
1da177e4 LT |
2443 | .maxlen = sizeof(int), |
2444 | .mode = 0644, | |
1ab1457c | 2445 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2446 | .strategy = &sysctl_jiffies, |
2447 | }, | |
2448 | { | |
2449 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2450 | .procname = "min_adv_mss", | |
1ab1457c | 2451 | .data = &ip6_rt_min_advmss, |
1da177e4 LT |
2452 | .maxlen = sizeof(int), |
2453 | .mode = 0644, | |
1ab1457c | 2454 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2455 | .strategy = &sysctl_jiffies, |
2456 | }, | |
2457 | { | |
2458 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2459 | .procname = "gc_min_interval_ms", | |
1ab1457c | 2460 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2461 | .maxlen = sizeof(int), |
2462 | .mode = 0644, | |
1ab1457c | 2463 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2464 | .strategy = &sysctl_ms_jiffies, |
2465 | }, | |
2466 | { .ctl_name = 0 } | |
2467 | }; | |
2468 | ||
2469 | #endif | |
2470 | ||
2471 | void __init ip6_route_init(void) | |
2472 | { | |
e5d679f3 AD |
2473 | ip6_dst_ops.kmem_cachep = |
2474 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
20c2df83 | 2475 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
14e50e57 DM |
2476 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2477 | ||
1da177e4 | 2478 | fib6_init(); |
33120b30 | 2479 | proc_net_fops_create(&init_net, "ipv6_route", 0, &ipv6_route_proc_fops); |
457c4cbc | 2480 | proc_net_fops_create(&init_net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); |
1da177e4 LT |
2481 | #ifdef CONFIG_XFRM |
2482 | xfrm6_init(); | |
2483 | #endif | |
101367c2 TG |
2484 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2485 | fib6_rules_init(); | |
2486 | #endif | |
c127ea2c TG |
2487 | |
2488 | __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL); | |
2489 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL); | |
2490 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL); | |
1da177e4 LT |
2491 | } |
2492 | ||
2493 | void ip6_route_cleanup(void) | |
2494 | { | |
101367c2 TG |
2495 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2496 | fib6_rules_cleanup(); | |
2497 | #endif | |
1da177e4 | 2498 | #ifdef CONFIG_PROC_FS |
457c4cbc EB |
2499 | proc_net_remove(&init_net, "ipv6_route"); |
2500 | proc_net_remove(&init_net, "rt6_stats"); | |
1da177e4 LT |
2501 | #endif |
2502 | #ifdef CONFIG_XFRM | |
2503 | xfrm6_fini(); | |
2504 | #endif | |
2505 | rt6_ifdown(NULL); | |
2506 | fib6_gc_cleanup(); | |
2507 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2508 | } |