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 LT |
40 | #include <linux/if_arp.h> |
41 | ||
42 | #ifdef CONFIG_PROC_FS | |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/seq_file.h> | |
45 | #endif | |
46 | ||
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
57 | #include <net/xfrm.h> | |
8d71740c | 58 | #include <net/netevent.h> |
21713ebc | 59 | #include <net/netlink.h> |
1da177e4 LT |
60 | |
61 | #include <asm/uaccess.h> | |
62 | ||
63 | #ifdef CONFIG_SYSCTL | |
64 | #include <linux/sysctl.h> | |
65 | #endif | |
66 | ||
67 | /* Set to 3 to get tracing. */ | |
68 | #define RT6_DEBUG 2 | |
69 | ||
70 | #if RT6_DEBUG >= 3 | |
71 | #define RDBG(x) printk x | |
72 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
73 | #else | |
74 | #define RDBG(x) | |
75 | #define RT6_TRACE(x...) do { ; } while (0) | |
76 | #endif | |
77 | ||
519fbd87 | 78 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 LT |
79 | |
80 | static int ip6_rt_max_size = 4096; | |
81 | static int ip6_rt_gc_min_interval = HZ / 2; | |
82 | static int ip6_rt_gc_timeout = 60*HZ; | |
83 | int ip6_rt_gc_interval = 30*HZ; | |
84 | static int ip6_rt_gc_elasticity = 9; | |
85 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
86 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
87 | ||
88 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
89 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
90 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
91 | static void ip6_dst_destroy(struct dst_entry *); | |
92 | static void ip6_dst_ifdown(struct dst_entry *, | |
93 | struct net_device *dev, int how); | |
94 | static int ip6_dst_gc(void); | |
95 | ||
96 | static int ip6_pkt_discard(struct sk_buff *skb); | |
97 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
98 | static void ip6_link_failure(struct sk_buff *skb); | |
99 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
100 | ||
70ceb4f5 YH |
101 | #ifdef CONFIG_IPV6_ROUTE_INFO |
102 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
103 | struct in6_addr *gwaddr, int ifindex, | |
104 | unsigned pref); | |
105 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
106 | struct in6_addr *gwaddr, int ifindex); | |
107 | #endif | |
108 | ||
1da177e4 LT |
109 | static struct dst_ops ip6_dst_ops = { |
110 | .family = AF_INET6, | |
111 | .protocol = __constant_htons(ETH_P_IPV6), | |
112 | .gc = ip6_dst_gc, | |
113 | .gc_thresh = 1024, | |
114 | .check = ip6_dst_check, | |
115 | .destroy = ip6_dst_destroy, | |
116 | .ifdown = ip6_dst_ifdown, | |
117 | .negative_advice = ip6_negative_advice, | |
118 | .link_failure = ip6_link_failure, | |
119 | .update_pmtu = ip6_rt_update_pmtu, | |
120 | .entry_size = sizeof(struct rt6_info), | |
121 | }; | |
122 | ||
14e50e57 DM |
123 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
124 | { | |
125 | } | |
126 | ||
127 | static struct dst_ops ip6_dst_blackhole_ops = { | |
128 | .family = AF_INET6, | |
129 | .protocol = __constant_htons(ETH_P_IPV6), | |
130 | .destroy = ip6_dst_destroy, | |
131 | .check = ip6_dst_check, | |
132 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
133 | .entry_size = sizeof(struct rt6_info), | |
134 | }; | |
135 | ||
1da177e4 LT |
136 | struct rt6_info ip6_null_entry = { |
137 | .u = { | |
138 | .dst = { | |
139 | .__refcnt = ATOMIC_INIT(1), | |
140 | .__use = 1, | |
1da177e4 LT |
141 | .obsolete = -1, |
142 | .error = -ENETUNREACH, | |
143 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
144 | .input = ip6_pkt_discard, | |
145 | .output = ip6_pkt_discard_out, | |
146 | .ops = &ip6_dst_ops, | |
147 | .path = (struct dst_entry*)&ip6_null_entry, | |
148 | } | |
149 | }, | |
150 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
151 | .rt6i_metric = ~(u32) 0, | |
152 | .rt6i_ref = ATOMIC_INIT(1), | |
153 | }; | |
154 | ||
101367c2 TG |
155 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
156 | ||
6723ab54 DM |
157 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
158 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
159 | static int ip6_pkt_blk_hole(struct sk_buff *skb); | |
160 | ||
101367c2 TG |
161 | struct rt6_info ip6_prohibit_entry = { |
162 | .u = { | |
163 | .dst = { | |
164 | .__refcnt = ATOMIC_INIT(1), | |
165 | .__use = 1, | |
101367c2 TG |
166 | .obsolete = -1, |
167 | .error = -EACCES, | |
168 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
169 | .input = ip6_pkt_prohibit, |
170 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
171 | .ops = &ip6_dst_ops, |
172 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
173 | } | |
174 | }, | |
175 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
176 | .rt6i_metric = ~(u32) 0, | |
177 | .rt6i_ref = ATOMIC_INIT(1), | |
178 | }; | |
179 | ||
180 | struct rt6_info ip6_blk_hole_entry = { | |
181 | .u = { | |
182 | .dst = { | |
183 | .__refcnt = ATOMIC_INIT(1), | |
184 | .__use = 1, | |
101367c2 TG |
185 | .obsolete = -1, |
186 | .error = -EINVAL, | |
187 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
188 | .input = ip6_pkt_blk_hole, |
189 | .output = ip6_pkt_blk_hole, | |
101367c2 TG |
190 | .ops = &ip6_dst_ops, |
191 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
192 | } | |
193 | }, | |
194 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
195 | .rt6i_metric = ~(u32) 0, | |
196 | .rt6i_ref = ATOMIC_INIT(1), | |
197 | }; | |
198 | ||
199 | #endif | |
200 | ||
1da177e4 LT |
201 | /* allocate dst with ip6_dst_ops */ |
202 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
203 | { | |
204 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
205 | } | |
206 | ||
207 | static void ip6_dst_destroy(struct dst_entry *dst) | |
208 | { | |
209 | struct rt6_info *rt = (struct rt6_info *)dst; | |
210 | struct inet6_dev *idev = rt->rt6i_idev; | |
211 | ||
212 | if (idev != NULL) { | |
213 | rt->rt6i_idev = NULL; | |
214 | in6_dev_put(idev); | |
1ab1457c | 215 | } |
1da177e4 LT |
216 | } |
217 | ||
218 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
219 | int how) | |
220 | { | |
221 | struct rt6_info *rt = (struct rt6_info *)dst; | |
222 | struct inet6_dev *idev = rt->rt6i_idev; | |
223 | ||
2774c7ab EB |
224 | if (dev != init_net.loopback_dev && idev != NULL && idev->dev == dev) { |
225 | struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev); | |
1da177e4 LT |
226 | if (loopback_idev != NULL) { |
227 | rt->rt6i_idev = loopback_idev; | |
228 | in6_dev_put(idev); | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
233 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
234 | { | |
235 | return (rt->rt6i_flags & RTF_EXPIRES && | |
236 | time_after(jiffies, rt->rt6i_expires)); | |
237 | } | |
238 | ||
c71099ac TG |
239 | static inline int rt6_need_strict(struct in6_addr *daddr) |
240 | { | |
241 | return (ipv6_addr_type(daddr) & | |
242 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
243 | } | |
244 | ||
1da177e4 | 245 | /* |
c71099ac | 246 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
247 | */ |
248 | ||
249 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
250 | int oif, | |
251 | int strict) | |
252 | { | |
253 | struct rt6_info *local = NULL; | |
254 | struct rt6_info *sprt; | |
255 | ||
256 | if (oif) { | |
7cc48263 | 257 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
258 | struct net_device *dev = sprt->rt6i_dev; |
259 | if (dev->ifindex == oif) | |
260 | return sprt; | |
261 | if (dev->flags & IFF_LOOPBACK) { | |
262 | if (sprt->rt6i_idev == NULL || | |
263 | sprt->rt6i_idev->dev->ifindex != oif) { | |
264 | if (strict && oif) | |
265 | continue; | |
1ab1457c | 266 | if (local && (!oif || |
1da177e4 LT |
267 | local->rt6i_idev->dev->ifindex == oif)) |
268 | continue; | |
269 | } | |
270 | local = sprt; | |
271 | } | |
272 | } | |
273 | ||
274 | if (local) | |
275 | return local; | |
276 | ||
277 | if (strict) | |
278 | return &ip6_null_entry; | |
279 | } | |
280 | return rt; | |
281 | } | |
282 | ||
27097255 YH |
283 | #ifdef CONFIG_IPV6_ROUTER_PREF |
284 | static void rt6_probe(struct rt6_info *rt) | |
285 | { | |
286 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
287 | /* | |
288 | * Okay, this does not seem to be appropriate | |
289 | * for now, however, we need to check if it | |
290 | * is really so; aka Router Reachability Probing. | |
291 | * | |
292 | * Router Reachability Probe MUST be rate-limited | |
293 | * to no more than one per minute. | |
294 | */ | |
295 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
296 | return; | |
297 | read_lock_bh(&neigh->lock); | |
298 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 299 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
300 | struct in6_addr mcaddr; |
301 | struct in6_addr *target; | |
302 | ||
303 | neigh->updated = jiffies; | |
304 | read_unlock_bh(&neigh->lock); | |
305 | ||
306 | target = (struct in6_addr *)&neigh->primary_key; | |
307 | addrconf_addr_solict_mult(target, &mcaddr); | |
308 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
309 | } else | |
310 | read_unlock_bh(&neigh->lock); | |
311 | } | |
312 | #else | |
313 | static inline void rt6_probe(struct rt6_info *rt) | |
314 | { | |
315 | return; | |
316 | } | |
317 | #endif | |
318 | ||
1da177e4 | 319 | /* |
554cfb7e | 320 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 321 | */ |
b6f99a21 | 322 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
323 | { |
324 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 325 | if (!oif || dev->ifindex == oif) |
554cfb7e | 326 | return 2; |
161980f4 DM |
327 | if ((dev->flags & IFF_LOOPBACK) && |
328 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
329 | return 1; | |
330 | return 0; | |
554cfb7e | 331 | } |
1da177e4 | 332 | |
b6f99a21 | 333 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 334 | { |
554cfb7e YH |
335 | struct neighbour *neigh = rt->rt6i_nexthop; |
336 | int m = 0; | |
4d0c5911 YH |
337 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
338 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
339 | m = 1; | |
340 | else if (neigh) { | |
554cfb7e YH |
341 | read_lock_bh(&neigh->lock); |
342 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 343 | m = 2; |
ea73ee23 YH |
344 | else if (!(neigh->nud_state & NUD_FAILED)) |
345 | m = 1; | |
554cfb7e | 346 | read_unlock_bh(&neigh->lock); |
1da177e4 | 347 | } |
554cfb7e | 348 | return m; |
1da177e4 LT |
349 | } |
350 | ||
554cfb7e YH |
351 | static int rt6_score_route(struct rt6_info *rt, int oif, |
352 | int strict) | |
1da177e4 | 353 | { |
4d0c5911 | 354 | int m, n; |
1ab1457c | 355 | |
4d0c5911 | 356 | m = rt6_check_dev(rt, oif); |
77d16f45 | 357 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 358 | return -1; |
ebacaaa0 YH |
359 | #ifdef CONFIG_IPV6_ROUTER_PREF |
360 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
361 | #endif | |
4d0c5911 | 362 | n = rt6_check_neigh(rt); |
557e92ef | 363 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
364 | return -1; |
365 | return m; | |
366 | } | |
367 | ||
f11e6659 DM |
368 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
369 | int *mpri, struct rt6_info *match) | |
554cfb7e | 370 | { |
f11e6659 DM |
371 | int m; |
372 | ||
373 | if (rt6_check_expired(rt)) | |
374 | goto out; | |
375 | ||
376 | m = rt6_score_route(rt, oif, strict); | |
377 | if (m < 0) | |
378 | goto out; | |
379 | ||
380 | if (m > *mpri) { | |
381 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
382 | rt6_probe(match); | |
383 | *mpri = m; | |
384 | match = rt; | |
385 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
386 | rt6_probe(rt); | |
387 | } | |
388 | ||
389 | out: | |
390 | return match; | |
391 | } | |
392 | ||
393 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
394 | struct rt6_info *rr_head, | |
395 | u32 metric, int oif, int strict) | |
396 | { | |
397 | struct rt6_info *rt, *match; | |
554cfb7e | 398 | int mpri = -1; |
1da177e4 | 399 | |
f11e6659 DM |
400 | match = NULL; |
401 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
402 | rt = rt->u.dst.rt6_next) | |
403 | match = find_match(rt, oif, strict, &mpri, match); | |
404 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
405 | rt = rt->u.dst.rt6_next) | |
406 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 407 | |
f11e6659 DM |
408 | return match; |
409 | } | |
1da177e4 | 410 | |
f11e6659 DM |
411 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
412 | { | |
413 | struct rt6_info *match, *rt0; | |
1da177e4 | 414 | |
f11e6659 DM |
415 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
416 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 417 | |
f11e6659 DM |
418 | rt0 = fn->rr_ptr; |
419 | if (!rt0) | |
420 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 421 | |
f11e6659 | 422 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 423 | |
554cfb7e | 424 | if (!match && |
f11e6659 DM |
425 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
426 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
427 | ||
554cfb7e | 428 | /* no entries matched; do round-robin */ |
f11e6659 DM |
429 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
430 | next = fn->leaf; | |
431 | ||
432 | if (next != rt0) | |
433 | fn->rr_ptr = next; | |
1da177e4 | 434 | } |
1da177e4 | 435 | |
f11e6659 DM |
436 | RT6_TRACE("%s() => %p\n", |
437 | __FUNCTION__, match); | |
1da177e4 | 438 | |
554cfb7e | 439 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
440 | } |
441 | ||
70ceb4f5 YH |
442 | #ifdef CONFIG_IPV6_ROUTE_INFO |
443 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
444 | struct in6_addr *gwaddr) | |
445 | { | |
446 | struct route_info *rinfo = (struct route_info *) opt; | |
447 | struct in6_addr prefix_buf, *prefix; | |
448 | unsigned int pref; | |
449 | u32 lifetime; | |
450 | struct rt6_info *rt; | |
451 | ||
452 | if (len < sizeof(struct route_info)) { | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
456 | /* Sanity check for prefix_len and length */ | |
457 | if (rinfo->length > 3) { | |
458 | return -EINVAL; | |
459 | } else if (rinfo->prefix_len > 128) { | |
460 | return -EINVAL; | |
461 | } else if (rinfo->prefix_len > 64) { | |
462 | if (rinfo->length < 2) { | |
463 | return -EINVAL; | |
464 | } | |
465 | } else if (rinfo->prefix_len > 0) { | |
466 | if (rinfo->length < 1) { | |
467 | return -EINVAL; | |
468 | } | |
469 | } | |
470 | ||
471 | pref = rinfo->route_pref; | |
472 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
473 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
474 | ||
e69a4adc | 475 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
476 | if (lifetime == 0xffffffff) { |
477 | /* infinity */ | |
478 | } else if (lifetime > 0x7fffffff/HZ) { | |
479 | /* Avoid arithmetic overflow */ | |
480 | lifetime = 0x7fffffff/HZ - 1; | |
481 | } | |
482 | ||
483 | if (rinfo->length == 3) | |
484 | prefix = (struct in6_addr *)rinfo->prefix; | |
485 | else { | |
486 | /* this function is safe */ | |
487 | ipv6_addr_prefix(&prefix_buf, | |
488 | (struct in6_addr *)rinfo->prefix, | |
489 | rinfo->prefix_len); | |
490 | prefix = &prefix_buf; | |
491 | } | |
492 | ||
493 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
494 | ||
495 | if (rt && !lifetime) { | |
e0a1ad73 | 496 | ip6_del_rt(rt); |
70ceb4f5 YH |
497 | rt = NULL; |
498 | } | |
499 | ||
500 | if (!rt && lifetime) | |
501 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
502 | pref); | |
503 | else if (rt) | |
504 | rt->rt6i_flags = RTF_ROUTEINFO | | |
505 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
506 | ||
507 | if (rt) { | |
508 | if (lifetime == 0xffffffff) { | |
509 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
510 | } else { | |
511 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
512 | rt->rt6i_flags |= RTF_EXPIRES; | |
513 | } | |
514 | dst_release(&rt->u.dst); | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | #endif | |
519 | ||
982f56f3 YH |
520 | #define BACKTRACK(saddr) \ |
521 | do { \ | |
522 | if (rt == &ip6_null_entry) { \ | |
523 | struct fib6_node *pn; \ | |
e0eda7bb | 524 | while (1) { \ |
982f56f3 YH |
525 | if (fn->fn_flags & RTN_TL_ROOT) \ |
526 | goto out; \ | |
527 | pn = fn->parent; \ | |
528 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 529 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
530 | else \ |
531 | fn = pn; \ | |
532 | if (fn->fn_flags & RTN_RTINFO) \ | |
533 | goto restart; \ | |
c71099ac | 534 | } \ |
c71099ac | 535 | } \ |
982f56f3 | 536 | } while(0) |
c71099ac TG |
537 | |
538 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
539 | struct flowi *fl, int flags) | |
1da177e4 LT |
540 | { |
541 | struct fib6_node *fn; | |
542 | struct rt6_info *rt; | |
543 | ||
c71099ac TG |
544 | read_lock_bh(&table->tb6_lock); |
545 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
546 | restart: | |
547 | rt = fn->leaf; | |
77d16f45 | 548 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 549 | BACKTRACK(&fl->fl6_src); |
c71099ac | 550 | out: |
33cc4896 | 551 | dst_hold(&rt->u.dst); |
c71099ac | 552 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
553 | |
554 | rt->u.dst.lastuse = jiffies; | |
c71099ac TG |
555 | rt->u.dst.__use++; |
556 | ||
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 | ||
8ce11e6a AB |
666 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
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: | |
f11e6659 | 685 | rt = rt6_select(fn, fl->iif, 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 | ||
c71099ac TG |
738 | void ip6_route_input(struct sk_buff *skb) |
739 | { | |
0660e03f | 740 | struct ipv6hdr *iph = ipv6_hdr(skb); |
adaa70bb | 741 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
742 | struct flowi fl = { |
743 | .iif = skb->dev->ifindex, | |
744 | .nl_u = { | |
745 | .ip6_u = { | |
746 | .daddr = iph->daddr, | |
747 | .saddr = iph->saddr, | |
90bcaf7b | 748 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
749 | }, |
750 | }, | |
1ab1457c | 751 | .mark = skb->mark, |
c71099ac TG |
752 | .proto = iph->nexthdr, |
753 | }; | |
adaa70bb TG |
754 | |
755 | if (rt6_need_strict(&iph->daddr)) | |
756 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
757 | |
758 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
759 | } | |
760 | ||
761 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
762 | struct flowi *fl, int flags) | |
1da177e4 LT |
763 | { |
764 | struct fib6_node *fn; | |
519fbd87 | 765 | struct rt6_info *rt, *nrt; |
c71099ac | 766 | int strict = 0; |
1da177e4 | 767 | int attempts = 3; |
519fbd87 | 768 | int err; |
ea659e07 | 769 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 770 | |
77d16f45 | 771 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
772 | |
773 | relookup: | |
c71099ac | 774 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 775 | |
8238dd06 | 776 | restart_2: |
c71099ac | 777 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
778 | |
779 | restart: | |
f11e6659 | 780 | rt = rt6_select(fn, fl->oif, strict | reachable); |
982f56f3 | 781 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
782 | if (rt == &ip6_null_entry || |
783 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 784 | goto out; |
1da177e4 | 785 | |
fb9de91e | 786 | dst_hold(&rt->u.dst); |
c71099ac | 787 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 788 | |
519fbd87 | 789 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 790 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
791 | else { |
792 | #if CLONE_OFFLINK_ROUTE | |
793 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
794 | #else | |
795 | goto out2; | |
796 | #endif | |
797 | } | |
1da177e4 | 798 | |
519fbd87 YH |
799 | dst_release(&rt->u.dst); |
800 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 801 | |
519fbd87 YH |
802 | dst_hold(&rt->u.dst); |
803 | if (nrt) { | |
40e22e8f | 804 | err = ip6_ins_rt(nrt); |
519fbd87 | 805 | if (!err) |
1da177e4 | 806 | goto out2; |
1da177e4 | 807 | } |
e40cf353 | 808 | |
519fbd87 YH |
809 | if (--attempts <= 0) |
810 | goto out2; | |
811 | ||
812 | /* | |
c71099ac | 813 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
814 | * released someone could insert this route. Relookup. |
815 | */ | |
816 | dst_release(&rt->u.dst); | |
817 | goto relookup; | |
818 | ||
819 | out: | |
8238dd06 YH |
820 | if (reachable) { |
821 | reachable = 0; | |
822 | goto restart_2; | |
823 | } | |
519fbd87 | 824 | dst_hold(&rt->u.dst); |
c71099ac | 825 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
826 | out2: |
827 | rt->u.dst.lastuse = jiffies; | |
828 | rt->u.dst.__use++; | |
c71099ac TG |
829 | return rt; |
830 | } | |
831 | ||
832 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
833 | { | |
834 | int flags = 0; | |
835 | ||
836 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 837 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 838 | |
adaa70bb TG |
839 | if (!ipv6_addr_any(&fl->fl6_src)) |
840 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
841 | ||
c71099ac | 842 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
843 | } |
844 | ||
7159039a | 845 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 846 | |
14e50e57 DM |
847 | static int ip6_blackhole_output(struct sk_buff *skb) |
848 | { | |
849 | kfree_skb(skb); | |
850 | return 0; | |
851 | } | |
852 | ||
853 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) | |
854 | { | |
855 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
856 | struct rt6_info *rt = (struct rt6_info *) | |
857 | dst_alloc(&ip6_dst_blackhole_ops); | |
858 | struct dst_entry *new = NULL; | |
859 | ||
860 | if (rt) { | |
861 | new = &rt->u.dst; | |
862 | ||
863 | atomic_set(&new->__refcnt, 1); | |
864 | new->__use = 1; | |
865 | new->input = ip6_blackhole_output; | |
866 | new->output = ip6_blackhole_output; | |
867 | ||
868 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
869 | new->dev = ort->u.dst.dev; | |
870 | if (new->dev) | |
871 | dev_hold(new->dev); | |
872 | rt->rt6i_idev = ort->rt6i_idev; | |
873 | if (rt->rt6i_idev) | |
874 | in6_dev_hold(rt->rt6i_idev); | |
875 | rt->rt6i_expires = 0; | |
876 | ||
877 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
878 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
879 | rt->rt6i_metric = 0; | |
880 | ||
881 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
882 | #ifdef CONFIG_IPV6_SUBTREES | |
883 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
884 | #endif | |
885 | ||
886 | dst_free(new); | |
887 | } | |
888 | ||
889 | dst_release(*dstp); | |
890 | *dstp = new; | |
891 | return (new ? 0 : -ENOMEM); | |
892 | } | |
893 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
894 | ||
1da177e4 LT |
895 | /* |
896 | * Destination cache support functions | |
897 | */ | |
898 | ||
899 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
900 | { | |
901 | struct rt6_info *rt; | |
902 | ||
903 | rt = (struct rt6_info *) dst; | |
904 | ||
905 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
906 | return dst; | |
907 | ||
908 | return NULL; | |
909 | } | |
910 | ||
911 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
912 | { | |
913 | struct rt6_info *rt = (struct rt6_info *) dst; | |
914 | ||
915 | if (rt) { | |
916 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 917 | ip6_del_rt(rt); |
1da177e4 LT |
918 | else |
919 | dst_release(dst); | |
920 | } | |
921 | return NULL; | |
922 | } | |
923 | ||
924 | static void ip6_link_failure(struct sk_buff *skb) | |
925 | { | |
926 | struct rt6_info *rt; | |
927 | ||
928 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
929 | ||
930 | rt = (struct rt6_info *) skb->dst; | |
931 | if (rt) { | |
932 | if (rt->rt6i_flags&RTF_CACHE) { | |
933 | dst_set_expires(&rt->u.dst, 0); | |
934 | rt->rt6i_flags |= RTF_EXPIRES; | |
935 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
936 | rt->rt6i_node->fn_sernum = -1; | |
937 | } | |
938 | } | |
939 | ||
940 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
941 | { | |
942 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
943 | ||
944 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
945 | rt6->rt6i_flags |= RTF_MODIFIED; | |
946 | if (mtu < IPV6_MIN_MTU) { | |
947 | mtu = IPV6_MIN_MTU; | |
948 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
949 | } | |
950 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 951 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
952 | } |
953 | } | |
954 | ||
1da177e4 LT |
955 | static int ipv6_get_mtu(struct net_device *dev); |
956 | ||
957 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
958 | { | |
959 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
960 | ||
961 | if (mtu < ip6_rt_min_advmss) | |
962 | mtu = ip6_rt_min_advmss; | |
963 | ||
964 | /* | |
1ab1457c YH |
965 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
966 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
967 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
968 | * rely only on pmtu discovery" |
969 | */ | |
970 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
971 | mtu = IPV6_MAXPLEN; | |
972 | return mtu; | |
973 | } | |
974 | ||
5d0bbeeb | 975 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 976 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 977 | |
1ab1457c | 978 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
1da177e4 LT |
979 | struct neighbour *neigh, |
980 | struct in6_addr *addr, | |
981 | int (*output)(struct sk_buff *)) | |
982 | { | |
983 | struct rt6_info *rt; | |
984 | struct inet6_dev *idev = in6_dev_get(dev); | |
985 | ||
986 | if (unlikely(idev == NULL)) | |
987 | return NULL; | |
988 | ||
989 | rt = ip6_dst_alloc(); | |
990 | if (unlikely(rt == NULL)) { | |
991 | in6_dev_put(idev); | |
992 | goto out; | |
993 | } | |
994 | ||
995 | dev_hold(dev); | |
996 | if (neigh) | |
997 | neigh_hold(neigh); | |
998 | else | |
999 | neigh = ndisc_get_neigh(dev, addr); | |
1000 | ||
1001 | rt->rt6i_dev = dev; | |
1002 | rt->rt6i_idev = idev; | |
1003 | rt->rt6i_nexthop = neigh; | |
1004 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1005 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
1006 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1007 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1008 | rt->u.dst.output = output; | |
1009 | ||
1010 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
1011 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1012 | ? DST_HOST | |
1da177e4 LT |
1013 | : 0; |
1014 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1015 | rt->rt6i_dst.plen = 128; | |
1016 | #endif | |
1017 | ||
5d0bbeeb | 1018 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
1019 | rt->u.dst.next = ndisc_dst_gc_list; |
1020 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 1021 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
1022 | |
1023 | fib6_force_start_gc(); | |
1024 | ||
1025 | out: | |
40aa7b90 | 1026 | return &rt->u.dst; |
1da177e4 LT |
1027 | } |
1028 | ||
1029 | int ndisc_dst_gc(int *more) | |
1030 | { | |
1031 | struct dst_entry *dst, *next, **pprev; | |
1032 | int freed; | |
1033 | ||
1034 | next = NULL; | |
1ab1457c | 1035 | freed = 0; |
5d0bbeeb TG |
1036 | |
1037 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 1038 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 1039 | |
1da177e4 LT |
1040 | while ((dst = *pprev) != NULL) { |
1041 | if (!atomic_read(&dst->__refcnt)) { | |
1042 | *pprev = dst->next; | |
1043 | dst_free(dst); | |
1044 | freed++; | |
1045 | } else { | |
1046 | pprev = &dst->next; | |
1047 | (*more)++; | |
1048 | } | |
1049 | } | |
1050 | ||
5d0bbeeb TG |
1051 | spin_unlock_bh(&ndisc_lock); |
1052 | ||
1da177e4 LT |
1053 | return freed; |
1054 | } | |
1055 | ||
1056 | static int ip6_dst_gc(void) | |
1057 | { | |
1058 | static unsigned expire = 30*HZ; | |
1059 | static unsigned long last_gc; | |
1060 | unsigned long now = jiffies; | |
1061 | ||
1062 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
1063 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
1064 | goto out; | |
1065 | ||
1066 | expire++; | |
1067 | fib6_run_gc(expire); | |
1068 | last_gc = now; | |
1069 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
1070 | expire = ip6_rt_gc_timeout>>1; | |
1071 | ||
1072 | out: | |
1073 | expire -= expire>>ip6_rt_gc_elasticity; | |
1074 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
1075 | } | |
1076 | ||
1077 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1078 | but results in cleaner routing tables. | |
1079 | ||
1080 | Remove it only when all the things will work! | |
1081 | */ | |
1082 | ||
1083 | static int ipv6_get_mtu(struct net_device *dev) | |
1084 | { | |
1085 | int mtu = IPV6_MIN_MTU; | |
1086 | struct inet6_dev *idev; | |
1087 | ||
1088 | idev = in6_dev_get(dev); | |
1089 | if (idev) { | |
1090 | mtu = idev->cnf.mtu6; | |
1091 | in6_dev_put(idev); | |
1092 | } | |
1093 | return mtu; | |
1094 | } | |
1095 | ||
1096 | int ipv6_get_hoplimit(struct net_device *dev) | |
1097 | { | |
1098 | int hoplimit = ipv6_devconf.hop_limit; | |
1099 | struct inet6_dev *idev; | |
1100 | ||
1101 | idev = in6_dev_get(dev); | |
1102 | if (idev) { | |
1103 | hoplimit = idev->cnf.hop_limit; | |
1104 | in6_dev_put(idev); | |
1105 | } | |
1106 | return hoplimit; | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * | |
1111 | */ | |
1112 | ||
86872cb5 | 1113 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1114 | { |
1115 | int err; | |
1da177e4 LT |
1116 | struct rt6_info *rt = NULL; |
1117 | struct net_device *dev = NULL; | |
1118 | struct inet6_dev *idev = NULL; | |
c71099ac | 1119 | struct fib6_table *table; |
1da177e4 LT |
1120 | int addr_type; |
1121 | ||
86872cb5 | 1122 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1123 | return -EINVAL; |
1124 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1125 | if (cfg->fc_src_len) |
1da177e4 LT |
1126 | return -EINVAL; |
1127 | #endif | |
86872cb5 | 1128 | if (cfg->fc_ifindex) { |
1da177e4 | 1129 | err = -ENODEV; |
881d966b | 1130 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
1da177e4 LT |
1131 | if (!dev) |
1132 | goto out; | |
1133 | idev = in6_dev_get(dev); | |
1134 | if (!idev) | |
1135 | goto out; | |
1136 | } | |
1137 | ||
86872cb5 TG |
1138 | if (cfg->fc_metric == 0) |
1139 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1140 | |
86872cb5 | 1141 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1142 | if (table == NULL) { |
1143 | err = -ENOBUFS; | |
1144 | goto out; | |
1145 | } | |
1146 | ||
1da177e4 LT |
1147 | rt = ip6_dst_alloc(); |
1148 | ||
1149 | if (rt == NULL) { | |
1150 | err = -ENOMEM; | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1155 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1156 | |
86872cb5 TG |
1157 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1158 | cfg->fc_protocol = RTPROT_BOOT; | |
1159 | rt->rt6i_protocol = cfg->fc_protocol; | |
1160 | ||
1161 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1162 | |
1163 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1164 | rt->u.dst.input = ip6_mc_input; | |
1165 | else | |
1166 | rt->u.dst.input = ip6_forward; | |
1167 | ||
1168 | rt->u.dst.output = ip6_output; | |
1169 | ||
86872cb5 TG |
1170 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1171 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1172 | if (rt->rt6i_dst.plen == 128) |
1173 | rt->u.dst.flags = DST_HOST; | |
1174 | ||
1175 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1176 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1177 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1178 | #endif |
1179 | ||
86872cb5 | 1180 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1181 | |
1182 | /* We cannot add true routes via loopback here, | |
1183 | they would result in kernel looping; promote them to reject routes | |
1184 | */ | |
86872cb5 | 1185 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1186 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1187 | /* hold loopback dev/idev if we haven't done so. */ | |
2774c7ab | 1188 | if (dev != init_net.loopback_dev) { |
1da177e4 LT |
1189 | if (dev) { |
1190 | dev_put(dev); | |
1191 | in6_dev_put(idev); | |
1192 | } | |
2774c7ab | 1193 | dev = init_net.loopback_dev; |
1da177e4 LT |
1194 | dev_hold(dev); |
1195 | idev = in6_dev_get(dev); | |
1196 | if (!idev) { | |
1197 | err = -ENODEV; | |
1198 | goto out; | |
1199 | } | |
1200 | } | |
1201 | rt->u.dst.output = ip6_pkt_discard_out; | |
1202 | rt->u.dst.input = ip6_pkt_discard; | |
1203 | rt->u.dst.error = -ENETUNREACH; | |
1204 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1205 | goto install_route; | |
1206 | } | |
1207 | ||
86872cb5 | 1208 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1209 | struct in6_addr *gw_addr; |
1210 | int gwa_type; | |
1211 | ||
86872cb5 TG |
1212 | gw_addr = &cfg->fc_gateway; |
1213 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1214 | gwa_type = ipv6_addr_type(gw_addr); |
1215 | ||
1216 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1217 | struct rt6_info *grt; | |
1218 | ||
1219 | /* IPv6 strictly inhibits using not link-local | |
1220 | addresses as nexthop address. | |
1221 | Otherwise, router will not able to send redirects. | |
1222 | It is very good, but in some (rare!) circumstances | |
1223 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1224 | some exceptions. --ANK | |
1225 | */ | |
1226 | err = -EINVAL; | |
1227 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1228 | goto out; | |
1229 | ||
86872cb5 | 1230 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1231 | |
1232 | err = -EHOSTUNREACH; | |
1233 | if (grt == NULL) | |
1234 | goto out; | |
1235 | if (dev) { | |
1236 | if (dev != grt->rt6i_dev) { | |
1237 | dst_release(&grt->u.dst); | |
1238 | goto out; | |
1239 | } | |
1240 | } else { | |
1241 | dev = grt->rt6i_dev; | |
1242 | idev = grt->rt6i_idev; | |
1243 | dev_hold(dev); | |
1244 | in6_dev_hold(grt->rt6i_idev); | |
1245 | } | |
1246 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1247 | err = 0; | |
1248 | dst_release(&grt->u.dst); | |
1249 | ||
1250 | if (err) | |
1251 | goto out; | |
1252 | } | |
1253 | err = -EINVAL; | |
1254 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1255 | goto out; | |
1256 | } | |
1257 | ||
1258 | err = -ENODEV; | |
1259 | if (dev == NULL) | |
1260 | goto out; | |
1261 | ||
86872cb5 | 1262 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1263 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1264 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1265 | err = PTR_ERR(rt->rt6i_nexthop); | |
1266 | rt->rt6i_nexthop = NULL; | |
1267 | goto out; | |
1268 | } | |
1269 | } | |
1270 | ||
86872cb5 | 1271 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1272 | |
1273 | install_route: | |
86872cb5 TG |
1274 | if (cfg->fc_mx) { |
1275 | struct nlattr *nla; | |
1276 | int remaining; | |
1277 | ||
1278 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1279 | int type = nla_type(nla); |
86872cb5 TG |
1280 | |
1281 | if (type) { | |
1282 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1283 | err = -EINVAL; |
1284 | goto out; | |
1285 | } | |
86872cb5 TG |
1286 | |
1287 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1288 | } |
1da177e4 LT |
1289 | } |
1290 | } | |
1291 | ||
1292 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1293 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1294 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1295 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1296 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1297 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1298 | rt->u.dst.dev = dev; | |
1299 | rt->rt6i_idev = idev; | |
c71099ac | 1300 | rt->rt6i_table = table; |
86872cb5 | 1301 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1302 | |
1303 | out: | |
1304 | if (dev) | |
1305 | dev_put(dev); | |
1306 | if (idev) | |
1307 | in6_dev_put(idev); | |
1308 | if (rt) | |
40aa7b90 | 1309 | dst_free(&rt->u.dst); |
1da177e4 LT |
1310 | return err; |
1311 | } | |
1312 | ||
86872cb5 | 1313 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1314 | { |
1315 | int err; | |
c71099ac | 1316 | struct fib6_table *table; |
1da177e4 | 1317 | |
6c813a72 PM |
1318 | if (rt == &ip6_null_entry) |
1319 | return -ENOENT; | |
1320 | ||
c71099ac TG |
1321 | table = rt->rt6i_table; |
1322 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1323 | |
86872cb5 | 1324 | err = fib6_del(rt, info); |
1da177e4 LT |
1325 | dst_release(&rt->u.dst); |
1326 | ||
c71099ac | 1327 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1328 | |
1329 | return err; | |
1330 | } | |
1331 | ||
e0a1ad73 TG |
1332 | int ip6_del_rt(struct rt6_info *rt) |
1333 | { | |
86872cb5 | 1334 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1335 | } |
1336 | ||
86872cb5 | 1337 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1338 | { |
c71099ac | 1339 | struct fib6_table *table; |
1da177e4 LT |
1340 | struct fib6_node *fn; |
1341 | struct rt6_info *rt; | |
1342 | int err = -ESRCH; | |
1343 | ||
86872cb5 | 1344 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1345 | if (table == NULL) |
1346 | return err; | |
1347 | ||
1348 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1349 | |
c71099ac | 1350 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1351 | &cfg->fc_dst, cfg->fc_dst_len, |
1352 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1353 | |
1da177e4 | 1354 | if (fn) { |
7cc48263 | 1355 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1356 | if (cfg->fc_ifindex && |
1da177e4 | 1357 | (rt->rt6i_dev == NULL || |
86872cb5 | 1358 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1359 | continue; |
86872cb5 TG |
1360 | if (cfg->fc_flags & RTF_GATEWAY && |
1361 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1362 | continue; |
86872cb5 | 1363 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1364 | continue; |
1365 | dst_hold(&rt->u.dst); | |
c71099ac | 1366 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1367 | |
86872cb5 | 1368 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1369 | } |
1370 | } | |
c71099ac | 1371 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1372 | |
1373 | return err; | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Handle redirects | |
1378 | */ | |
a6279458 YH |
1379 | struct ip6rd_flowi { |
1380 | struct flowi fl; | |
1381 | struct in6_addr gateway; | |
1382 | }; | |
1383 | ||
1384 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1385 | struct flowi *fl, | |
1386 | int flags) | |
1da177e4 | 1387 | { |
a6279458 YH |
1388 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1389 | struct rt6_info *rt; | |
e843b9e1 | 1390 | struct fib6_node *fn; |
c71099ac | 1391 | |
1da177e4 | 1392 | /* |
e843b9e1 YH |
1393 | * Get the "current" route for this destination and |
1394 | * check if the redirect has come from approriate router. | |
1395 | * | |
1396 | * RFC 2461 specifies that redirects should only be | |
1397 | * accepted if they come from the nexthop to the target. | |
1398 | * Due to the way the routes are chosen, this notion | |
1399 | * is a bit fuzzy and one might need to check all possible | |
1400 | * routes. | |
1da177e4 | 1401 | */ |
1da177e4 | 1402 | |
c71099ac | 1403 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1404 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1405 | restart: |
7cc48263 | 1406 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1407 | /* |
1408 | * Current route is on-link; redirect is always invalid. | |
1409 | * | |
1410 | * Seems, previous statement is not true. It could | |
1411 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1412 | * But then router serving it might decide, that we should | |
1413 | * know truth 8)8) --ANK (980726). | |
1414 | */ | |
1415 | if (rt6_check_expired(rt)) | |
1416 | continue; | |
1417 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1418 | continue; | |
a6279458 | 1419 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1420 | continue; |
a6279458 | 1421 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1422 | continue; |
1423 | break; | |
1424 | } | |
a6279458 | 1425 | |
cb15d9c2 | 1426 | if (!rt) |
a6279458 | 1427 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1428 | BACKTRACK(&fl->fl6_src); |
1429 | out: | |
a6279458 YH |
1430 | dst_hold(&rt->u.dst); |
1431 | ||
c71099ac | 1432 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1433 | |
a6279458 YH |
1434 | return rt; |
1435 | }; | |
1436 | ||
1437 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1438 | struct in6_addr *src, | |
1439 | struct in6_addr *gateway, | |
1440 | struct net_device *dev) | |
1441 | { | |
adaa70bb | 1442 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1443 | struct ip6rd_flowi rdfl = { |
1444 | .fl = { | |
1445 | .oif = dev->ifindex, | |
1446 | .nl_u = { | |
1447 | .ip6_u = { | |
1448 | .daddr = *dest, | |
1449 | .saddr = *src, | |
1450 | }, | |
1451 | }, | |
1452 | }, | |
1453 | .gateway = *gateway, | |
1454 | }; | |
adaa70bb TG |
1455 | |
1456 | if (rt6_need_strict(dest)) | |
1457 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1458 | |
1459 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1460 | } | |
1461 | ||
1462 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1463 | struct in6_addr *saddr, | |
1464 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1465 | { | |
1466 | struct rt6_info *rt, *nrt = NULL; | |
1467 | struct netevent_redirect netevent; | |
1468 | ||
1469 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1470 | ||
1471 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1472 | if (net_ratelimit()) |
1473 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1474 | "for redirect target\n"); | |
a6279458 | 1475 | goto out; |
1da177e4 LT |
1476 | } |
1477 | ||
1da177e4 LT |
1478 | /* |
1479 | * We have finally decided to accept it. | |
1480 | */ | |
1481 | ||
1ab1457c | 1482 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1483 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1484 | NEIGH_UPDATE_F_OVERRIDE| | |
1485 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1486 | NEIGH_UPDATE_F_ISROUTER)) | |
1487 | ); | |
1488 | ||
1489 | /* | |
1490 | * Redirect received -> path was valid. | |
1491 | * Look, redirects are sent only in response to data packets, | |
1492 | * so that this nexthop apparently is reachable. --ANK | |
1493 | */ | |
1494 | dst_confirm(&rt->u.dst); | |
1495 | ||
1496 | /* Duplicate redirect: silently ignore. */ | |
1497 | if (neigh == rt->u.dst.neighbour) | |
1498 | goto out; | |
1499 | ||
1500 | nrt = ip6_rt_copy(rt); | |
1501 | if (nrt == NULL) | |
1502 | goto out; | |
1503 | ||
1504 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1505 | if (on_link) | |
1506 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1507 | ||
1508 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1509 | nrt->rt6i_dst.plen = 128; | |
1510 | nrt->u.dst.flags |= DST_HOST; | |
1511 | ||
1512 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1513 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1514 | /* Reset pmtu, it may be better */ | |
1515 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1516 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1517 | ||
40e22e8f | 1518 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1519 | goto out; |
1520 | ||
8d71740c TT |
1521 | netevent.old = &rt->u.dst; |
1522 | netevent.new = &nrt->u.dst; | |
1523 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1524 | ||
1da177e4 | 1525 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1526 | ip6_del_rt(rt); |
1da177e4 LT |
1527 | return; |
1528 | } | |
1529 | ||
1530 | out: | |
1ab1457c | 1531 | dst_release(&rt->u.dst); |
1da177e4 LT |
1532 | return; |
1533 | } | |
1534 | ||
1535 | /* | |
1536 | * Handle ICMP "packet too big" messages | |
1537 | * i.e. Path MTU discovery | |
1538 | */ | |
1539 | ||
1540 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1541 | struct net_device *dev, u32 pmtu) | |
1542 | { | |
1543 | struct rt6_info *rt, *nrt; | |
1544 | int allfrag = 0; | |
1545 | ||
1546 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1547 | if (rt == NULL) | |
1548 | return; | |
1549 | ||
1550 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1551 | goto out; | |
1552 | ||
1553 | if (pmtu < IPV6_MIN_MTU) { | |
1554 | /* | |
1ab1457c | 1555 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1556 | * MTU (1280) and a fragment header should always be included |
1557 | * after a node receiving Too Big message reporting PMTU is | |
1558 | * less than the IPv6 Minimum Link MTU. | |
1559 | */ | |
1560 | pmtu = IPV6_MIN_MTU; | |
1561 | allfrag = 1; | |
1562 | } | |
1563 | ||
1564 | /* New mtu received -> path was valid. | |
1565 | They are sent only in response to data packets, | |
1566 | so that this nexthop apparently is reachable. --ANK | |
1567 | */ | |
1568 | dst_confirm(&rt->u.dst); | |
1569 | ||
1570 | /* Host route. If it is static, it would be better | |
1571 | not to override it, but add new one, so that | |
1572 | when cache entry will expire old pmtu | |
1573 | would return automatically. | |
1574 | */ | |
1575 | if (rt->rt6i_flags & RTF_CACHE) { | |
1576 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1577 | if (allfrag) | |
1578 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1579 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1580 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1581 | goto out; | |
1582 | } | |
1583 | ||
1584 | /* Network route. | |
1585 | Two cases are possible: | |
1586 | 1. It is connected route. Action: COW | |
1587 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1588 | */ | |
d5315b50 | 1589 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1590 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1591 | else |
1592 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1593 | |
d5315b50 | 1594 | if (nrt) { |
a1e78363 YH |
1595 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1596 | if (allfrag) | |
1597 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1598 | ||
1599 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1600 | * happened within 5 mins, the recommended timer is 10 mins. | |
1601 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1602 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1603 | * and detecting PMTU increase will be automatically happened. | |
1604 | */ | |
1605 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1606 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1607 | ||
40e22e8f | 1608 | ip6_ins_rt(nrt); |
1da177e4 | 1609 | } |
1da177e4 LT |
1610 | out: |
1611 | dst_release(&rt->u.dst); | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * Misc support functions | |
1616 | */ | |
1617 | ||
1618 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1619 | { | |
1620 | struct rt6_info *rt = ip6_dst_alloc(); | |
1621 | ||
1622 | if (rt) { | |
1623 | rt->u.dst.input = ort->u.dst.input; | |
1624 | rt->u.dst.output = ort->u.dst.output; | |
1625 | ||
1626 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1627 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1628 | rt->u.dst.dev = ort->u.dst.dev; |
1629 | if (rt->u.dst.dev) | |
1630 | dev_hold(rt->u.dst.dev); | |
1631 | rt->rt6i_idev = ort->rt6i_idev; | |
1632 | if (rt->rt6i_idev) | |
1633 | in6_dev_hold(rt->rt6i_idev); | |
1634 | rt->u.dst.lastuse = jiffies; | |
1635 | rt->rt6i_expires = 0; | |
1636 | ||
1637 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1638 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1639 | rt->rt6i_metric = 0; | |
1640 | ||
1641 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1642 | #ifdef CONFIG_IPV6_SUBTREES | |
1643 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1644 | #endif | |
c71099ac | 1645 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1646 | } |
1647 | return rt; | |
1648 | } | |
1649 | ||
70ceb4f5 YH |
1650 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1651 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1652 | struct in6_addr *gwaddr, int ifindex) | |
1653 | { | |
1654 | struct fib6_node *fn; | |
1655 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1656 | struct fib6_table *table; |
1657 | ||
1658 | table = fib6_get_table(RT6_TABLE_INFO); | |
1659 | if (table == NULL) | |
1660 | return NULL; | |
70ceb4f5 | 1661 | |
c71099ac TG |
1662 | write_lock_bh(&table->tb6_lock); |
1663 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1664 | if (!fn) |
1665 | goto out; | |
1666 | ||
7cc48263 | 1667 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1668 | if (rt->rt6i_dev->ifindex != ifindex) |
1669 | continue; | |
1670 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1671 | continue; | |
1672 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1673 | continue; | |
1674 | dst_hold(&rt->u.dst); | |
1675 | break; | |
1676 | } | |
1677 | out: | |
c71099ac | 1678 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1679 | return rt; |
1680 | } | |
1681 | ||
1682 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1683 | struct in6_addr *gwaddr, int ifindex, | |
1684 | unsigned pref) | |
1685 | { | |
86872cb5 TG |
1686 | struct fib6_config cfg = { |
1687 | .fc_table = RT6_TABLE_INFO, | |
1688 | .fc_metric = 1024, | |
1689 | .fc_ifindex = ifindex, | |
1690 | .fc_dst_len = prefixlen, | |
1691 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1692 | RTF_UP | RTF_PREF(pref), | |
1693 | }; | |
1694 | ||
1695 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1696 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1697 | |
e317da96 YH |
1698 | /* We should treat it as a default route if prefix length is 0. */ |
1699 | if (!prefixlen) | |
86872cb5 | 1700 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1701 | |
86872cb5 | 1702 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1703 | |
1704 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1705 | } | |
1706 | #endif | |
1707 | ||
1da177e4 | 1708 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1709 | { |
1da177e4 | 1710 | struct rt6_info *rt; |
c71099ac | 1711 | struct fib6_table *table; |
1da177e4 | 1712 | |
c71099ac TG |
1713 | table = fib6_get_table(RT6_TABLE_DFLT); |
1714 | if (table == NULL) | |
1715 | return NULL; | |
1da177e4 | 1716 | |
c71099ac | 1717 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1718 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1719 | if (dev == rt->rt6i_dev && |
045927ff | 1720 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1721 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1722 | break; | |
1723 | } | |
1724 | if (rt) | |
1725 | dst_hold(&rt->u.dst); | |
c71099ac | 1726 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1727 | return rt; |
1728 | } | |
1729 | ||
1730 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1731 | struct net_device *dev, |
1732 | unsigned int pref) | |
1da177e4 | 1733 | { |
86872cb5 TG |
1734 | struct fib6_config cfg = { |
1735 | .fc_table = RT6_TABLE_DFLT, | |
1736 | .fc_metric = 1024, | |
1737 | .fc_ifindex = dev->ifindex, | |
1738 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1739 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1740 | }; | |
1da177e4 | 1741 | |
86872cb5 | 1742 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1743 | |
86872cb5 | 1744 | ip6_route_add(&cfg); |
1da177e4 | 1745 | |
1da177e4 LT |
1746 | return rt6_get_dflt_router(gwaddr, dev); |
1747 | } | |
1748 | ||
1749 | void rt6_purge_dflt_routers(void) | |
1750 | { | |
1751 | struct rt6_info *rt; | |
c71099ac TG |
1752 | struct fib6_table *table; |
1753 | ||
1754 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1755 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1756 | if (table == NULL) | |
1757 | return; | |
1da177e4 LT |
1758 | |
1759 | restart: | |
c71099ac | 1760 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1761 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1762 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1763 | dst_hold(&rt->u.dst); | |
c71099ac | 1764 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1765 | ip6_del_rt(rt); |
1da177e4 LT |
1766 | goto restart; |
1767 | } | |
1768 | } | |
c71099ac | 1769 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1770 | } |
1771 | ||
86872cb5 TG |
1772 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1773 | struct fib6_config *cfg) | |
1774 | { | |
1775 | memset(cfg, 0, sizeof(*cfg)); | |
1776 | ||
1777 | cfg->fc_table = RT6_TABLE_MAIN; | |
1778 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1779 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1780 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1781 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1782 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1783 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1784 | ||
1785 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1786 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1787 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1788 | } | |
1789 | ||
1da177e4 LT |
1790 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1791 | { | |
86872cb5 | 1792 | struct fib6_config cfg; |
1da177e4 LT |
1793 | struct in6_rtmsg rtmsg; |
1794 | int err; | |
1795 | ||
1796 | switch(cmd) { | |
1797 | case SIOCADDRT: /* Add a route */ | |
1798 | case SIOCDELRT: /* Delete a route */ | |
1799 | if (!capable(CAP_NET_ADMIN)) | |
1800 | return -EPERM; | |
1801 | err = copy_from_user(&rtmsg, arg, | |
1802 | sizeof(struct in6_rtmsg)); | |
1803 | if (err) | |
1804 | return -EFAULT; | |
86872cb5 TG |
1805 | |
1806 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1807 | ||
1da177e4 LT |
1808 | rtnl_lock(); |
1809 | switch (cmd) { | |
1810 | case SIOCADDRT: | |
86872cb5 | 1811 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1812 | break; |
1813 | case SIOCDELRT: | |
86872cb5 | 1814 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1815 | break; |
1816 | default: | |
1817 | err = -EINVAL; | |
1818 | } | |
1819 | rtnl_unlock(); | |
1820 | ||
1821 | return err; | |
3ff50b79 | 1822 | } |
1da177e4 LT |
1823 | |
1824 | return -EINVAL; | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * Drop the packet on the floor | |
1829 | */ | |
1830 | ||
612f09e8 YH |
1831 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, |
1832 | int ipstats_mib_noroutes) | |
1da177e4 | 1833 | { |
612f09e8 YH |
1834 | int type; |
1835 | switch (ipstats_mib_noroutes) { | |
1836 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1837 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1838 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1839 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1840 | break; | |
1841 | } | |
1842 | /* FALLTHROUGH */ | |
1843 | case IPSTATS_MIB_OUTNOROUTES: | |
1844 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1845 | break; | |
1846 | } | |
9ce8ade0 | 1847 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1848 | kfree_skb(skb); |
1849 | return 0; | |
1850 | } | |
1851 | ||
9ce8ade0 TG |
1852 | static int ip6_pkt_discard(struct sk_buff *skb) |
1853 | { | |
612f09e8 | 1854 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1855 | } |
1856 | ||
20380731 | 1857 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1858 | { |
1859 | skb->dev = skb->dst->dev; | |
612f09e8 | 1860 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1861 | } |
1862 | ||
6723ab54 DM |
1863 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1864 | ||
9ce8ade0 TG |
1865 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1866 | { | |
612f09e8 | 1867 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1868 | } |
1869 | ||
1870 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1871 | { | |
1872 | skb->dev = skb->dst->dev; | |
612f09e8 | 1873 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1874 | } |
1875 | ||
1876 | static int ip6_pkt_blk_hole(struct sk_buff *skb) | |
1877 | { | |
1878 | kfree_skb(skb); | |
1879 | return 0; | |
1880 | } | |
1881 | ||
6723ab54 DM |
1882 | #endif |
1883 | ||
1da177e4 LT |
1884 | /* |
1885 | * Allocate a dst for local (unicast / anycast) address. | |
1886 | */ | |
1887 | ||
1888 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1889 | const struct in6_addr *addr, | |
1890 | int anycast) | |
1891 | { | |
1892 | struct rt6_info *rt = ip6_dst_alloc(); | |
1893 | ||
1894 | if (rt == NULL) | |
1895 | return ERR_PTR(-ENOMEM); | |
1896 | ||
2774c7ab | 1897 | dev_hold(init_net.loopback_dev); |
1da177e4 LT |
1898 | in6_dev_hold(idev); |
1899 | ||
1900 | rt->u.dst.flags = DST_HOST; | |
1901 | rt->u.dst.input = ip6_input; | |
1902 | rt->u.dst.output = ip6_output; | |
2774c7ab | 1903 | rt->rt6i_dev = init_net.loopback_dev; |
1da177e4 LT |
1904 | rt->rt6i_idev = idev; |
1905 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1906 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1907 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1908 | rt->u.dst.obsolete = -1; | |
1909 | ||
1910 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1911 | if (anycast) |
1912 | rt->rt6i_flags |= RTF_ANYCAST; | |
1913 | else | |
1da177e4 LT |
1914 | rt->rt6i_flags |= RTF_LOCAL; |
1915 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1916 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1917 | dst_free(&rt->u.dst); |
1da177e4 LT |
1918 | return ERR_PTR(-ENOMEM); |
1919 | } | |
1920 | ||
1921 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1922 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1923 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1924 | |
1925 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1926 | ||
1927 | return rt; | |
1928 | } | |
1929 | ||
1930 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1931 | { | |
1932 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1933 | rt != &ip6_null_entry) { | |
1934 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1935 | return -1; | |
1936 | } | |
1937 | return 0; | |
1938 | } | |
1939 | ||
1940 | void rt6_ifdown(struct net_device *dev) | |
1941 | { | |
c71099ac | 1942 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1943 | } |
1944 | ||
1945 | struct rt6_mtu_change_arg | |
1946 | { | |
1947 | struct net_device *dev; | |
1948 | unsigned mtu; | |
1949 | }; | |
1950 | ||
1951 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1952 | { | |
1953 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1954 | struct inet6_dev *idev; | |
1955 | ||
1956 | /* In IPv6 pmtu discovery is not optional, | |
1957 | so that RTAX_MTU lock cannot disable it. | |
1958 | We still use this lock to block changes | |
1959 | caused by addrconf/ndisc. | |
1960 | */ | |
1961 | ||
1962 | idev = __in6_dev_get(arg->dev); | |
1963 | if (idev == NULL) | |
1964 | return 0; | |
1965 | ||
1966 | /* For administrative MTU increase, there is no way to discover | |
1967 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1968 | Since RFC 1981 doesn't include administrative MTU increase | |
1969 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1970 | */ | |
1971 | /* | |
1972 | If new MTU is less than route PMTU, this new MTU will be the | |
1973 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1974 | decreases; if new MTU is greater than route PMTU, and the | |
1975 | old MTU is the lowest MTU in the path, update the route PMTU | |
1976 | to reflect the increase. In this case if the other nodes' MTU | |
1977 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1978 | PMTU discouvery. | |
1979 | */ | |
1980 | if (rt->rt6i_dev == arg->dev && | |
1981 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1ab1457c YH |
1982 | (dst_mtu(&rt->u.dst) > arg->mtu || |
1983 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
566cfd8f | 1984 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1985 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
566cfd8f SA |
1986 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
1987 | } | |
1da177e4 LT |
1988 | return 0; |
1989 | } | |
1990 | ||
1991 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1992 | { | |
c71099ac TG |
1993 | struct rt6_mtu_change_arg arg = { |
1994 | .dev = dev, | |
1995 | .mtu = mtu, | |
1996 | }; | |
1da177e4 | 1997 | |
c71099ac | 1998 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1999 | } |
2000 | ||
ef7c79ed | 2001 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2002 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2003 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2004 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2005 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2006 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2007 | }; | |
2008 | ||
2009 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2010 | struct fib6_config *cfg) | |
1da177e4 | 2011 | { |
86872cb5 TG |
2012 | struct rtmsg *rtm; |
2013 | struct nlattr *tb[RTA_MAX+1]; | |
2014 | int err; | |
1da177e4 | 2015 | |
86872cb5 TG |
2016 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2017 | if (err < 0) | |
2018 | goto errout; | |
1da177e4 | 2019 | |
86872cb5 TG |
2020 | err = -EINVAL; |
2021 | rtm = nlmsg_data(nlh); | |
2022 | memset(cfg, 0, sizeof(*cfg)); | |
2023 | ||
2024 | cfg->fc_table = rtm->rtm_table; | |
2025 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2026 | cfg->fc_src_len = rtm->rtm_src_len; | |
2027 | cfg->fc_flags = RTF_UP; | |
2028 | cfg->fc_protocol = rtm->rtm_protocol; | |
2029 | ||
2030 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2031 | cfg->fc_flags |= RTF_REJECT; | |
2032 | ||
2033 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2034 | cfg->fc_nlinfo.nlh = nlh; | |
2035 | ||
2036 | if (tb[RTA_GATEWAY]) { | |
2037 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2038 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2039 | } |
86872cb5 TG |
2040 | |
2041 | if (tb[RTA_DST]) { | |
2042 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2043 | ||
2044 | if (nla_len(tb[RTA_DST]) < plen) | |
2045 | goto errout; | |
2046 | ||
2047 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2048 | } |
86872cb5 TG |
2049 | |
2050 | if (tb[RTA_SRC]) { | |
2051 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2052 | ||
2053 | if (nla_len(tb[RTA_SRC]) < plen) | |
2054 | goto errout; | |
2055 | ||
2056 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2057 | } |
86872cb5 TG |
2058 | |
2059 | if (tb[RTA_OIF]) | |
2060 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2061 | ||
2062 | if (tb[RTA_PRIORITY]) | |
2063 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2064 | ||
2065 | if (tb[RTA_METRICS]) { | |
2066 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2067 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2068 | } |
86872cb5 TG |
2069 | |
2070 | if (tb[RTA_TABLE]) | |
2071 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2072 | ||
2073 | err = 0; | |
2074 | errout: | |
2075 | return err; | |
1da177e4 LT |
2076 | } |
2077 | ||
c127ea2c | 2078 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2079 | { |
86872cb5 TG |
2080 | struct fib6_config cfg; |
2081 | int err; | |
1da177e4 | 2082 | |
86872cb5 TG |
2083 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2084 | if (err < 0) | |
2085 | return err; | |
2086 | ||
2087 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2088 | } |
2089 | ||
c127ea2c | 2090 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2091 | { |
86872cb5 TG |
2092 | struct fib6_config cfg; |
2093 | int err; | |
1da177e4 | 2094 | |
86872cb5 TG |
2095 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2096 | if (err < 0) | |
2097 | return err; | |
2098 | ||
2099 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2100 | } |
2101 | ||
339bf98f TG |
2102 | static inline size_t rt6_nlmsg_size(void) |
2103 | { | |
2104 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2105 | + nla_total_size(16) /* RTA_SRC */ | |
2106 | + nla_total_size(16) /* RTA_DST */ | |
2107 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2108 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2109 | + nla_total_size(4) /* RTA_TABLE */ | |
2110 | + nla_total_size(4) /* RTA_IIF */ | |
2111 | + nla_total_size(4) /* RTA_OIF */ | |
2112 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2113 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2114 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2115 | } | |
2116 | ||
1da177e4 | 2117 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2118 | struct in6_addr *dst, struct in6_addr *src, |
2119 | int iif, int type, u32 pid, u32 seq, | |
2120 | int prefix, unsigned int flags) | |
1da177e4 LT |
2121 | { |
2122 | struct rtmsg *rtm; | |
2d7202bf | 2123 | struct nlmsghdr *nlh; |
e3703b3d | 2124 | long expires; |
9e762a4a | 2125 | u32 table; |
1da177e4 LT |
2126 | |
2127 | if (prefix) { /* user wants prefix routes only */ | |
2128 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2129 | /* success since this is not a prefix route */ | |
2130 | return 1; | |
2131 | } | |
2132 | } | |
2133 | ||
2d7202bf TG |
2134 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2135 | if (nlh == NULL) | |
26932566 | 2136 | return -EMSGSIZE; |
2d7202bf TG |
2137 | |
2138 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2139 | rtm->rtm_family = AF_INET6; |
2140 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2141 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2142 | rtm->rtm_tos = 0; | |
c71099ac | 2143 | if (rt->rt6i_table) |
9e762a4a | 2144 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2145 | else |
9e762a4a PM |
2146 | table = RT6_TABLE_UNSPEC; |
2147 | rtm->rtm_table = table; | |
2d7202bf | 2148 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2149 | if (rt->rt6i_flags&RTF_REJECT) |
2150 | rtm->rtm_type = RTN_UNREACHABLE; | |
2151 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2152 | rtm->rtm_type = RTN_LOCAL; | |
2153 | else | |
2154 | rtm->rtm_type = RTN_UNICAST; | |
2155 | rtm->rtm_flags = 0; | |
2156 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2157 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2158 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2159 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2160 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2161 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2162 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2163 | rtm->rtm_protocol = RTPROT_RA; | |
2164 | ||
2165 | if (rt->rt6i_flags&RTF_CACHE) | |
2166 | rtm->rtm_flags |= RTM_F_CLONED; | |
2167 | ||
2168 | if (dst) { | |
2d7202bf | 2169 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2170 | rtm->rtm_dst_len = 128; |
1da177e4 | 2171 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2172 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2173 | #ifdef CONFIG_IPV6_SUBTREES |
2174 | if (src) { | |
2d7202bf | 2175 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2176 | rtm->rtm_src_len = 128; |
1da177e4 | 2177 | } else if (rtm->rtm_src_len) |
2d7202bf | 2178 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2179 | #endif |
2180 | if (iif) | |
2d7202bf | 2181 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2182 | else if (dst) { |
2183 | struct in6_addr saddr_buf; | |
2184 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2185 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2186 | } |
2d7202bf | 2187 | |
1da177e4 | 2188 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2189 | goto nla_put_failure; |
2190 | ||
1da177e4 | 2191 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2192 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2193 | ||
1da177e4 | 2194 | if (rt->u.dst.dev) |
2d7202bf TG |
2195 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2196 | ||
2197 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2198 | |
2199 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2200 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2201 | expires, rt->u.dst.error) < 0) | |
2202 | goto nla_put_failure; | |
2d7202bf TG |
2203 | |
2204 | return nlmsg_end(skb, nlh); | |
2205 | ||
2206 | nla_put_failure: | |
26932566 PM |
2207 | nlmsg_cancel(skb, nlh); |
2208 | return -EMSGSIZE; | |
1da177e4 LT |
2209 | } |
2210 | ||
1b43af54 | 2211 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2212 | { |
2213 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2214 | int prefix; | |
2215 | ||
2d7202bf TG |
2216 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2217 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2218 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2219 | } else | |
2220 | prefix = 0; | |
2221 | ||
2222 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2223 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2224 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2225 | } |
2226 | ||
c127ea2c | 2227 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2228 | { |
ab364a6f TG |
2229 | struct nlattr *tb[RTA_MAX+1]; |
2230 | struct rt6_info *rt; | |
1da177e4 | 2231 | struct sk_buff *skb; |
ab364a6f | 2232 | struct rtmsg *rtm; |
1da177e4 | 2233 | struct flowi fl; |
ab364a6f | 2234 | int err, iif = 0; |
1da177e4 | 2235 | |
ab364a6f TG |
2236 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2237 | if (err < 0) | |
2238 | goto errout; | |
1da177e4 | 2239 | |
ab364a6f | 2240 | err = -EINVAL; |
1da177e4 | 2241 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2242 | |
ab364a6f TG |
2243 | if (tb[RTA_SRC]) { |
2244 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2245 | goto errout; | |
2246 | ||
2247 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2248 | } | |
2249 | ||
2250 | if (tb[RTA_DST]) { | |
2251 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2252 | goto errout; | |
2253 | ||
2254 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2255 | } | |
2256 | ||
2257 | if (tb[RTA_IIF]) | |
2258 | iif = nla_get_u32(tb[RTA_IIF]); | |
2259 | ||
2260 | if (tb[RTA_OIF]) | |
2261 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2262 | |
2263 | if (iif) { | |
2264 | struct net_device *dev; | |
881d966b | 2265 | dev = __dev_get_by_index(&init_net, iif); |
1da177e4 LT |
2266 | if (!dev) { |
2267 | err = -ENODEV; | |
ab364a6f | 2268 | goto errout; |
1da177e4 LT |
2269 | } |
2270 | } | |
2271 | ||
ab364a6f TG |
2272 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2273 | if (skb == NULL) { | |
2274 | err = -ENOBUFS; | |
2275 | goto errout; | |
2276 | } | |
1da177e4 | 2277 | |
ab364a6f TG |
2278 | /* Reserve room for dummy headers, this skb can pass |
2279 | through good chunk of routing engine. | |
2280 | */ | |
459a98ed | 2281 | skb_reset_mac_header(skb); |
ab364a6f | 2282 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2283 | |
ab364a6f | 2284 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2285 | skb->dst = &rt->u.dst; |
2286 | ||
ab364a6f | 2287 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2288 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2289 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2290 | if (err < 0) { |
ab364a6f TG |
2291 | kfree_skb(skb); |
2292 | goto errout; | |
1da177e4 LT |
2293 | } |
2294 | ||
2942e900 | 2295 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
ab364a6f | 2296 | errout: |
1da177e4 | 2297 | return err; |
1da177e4 LT |
2298 | } |
2299 | ||
86872cb5 | 2300 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2301 | { |
2302 | struct sk_buff *skb; | |
86872cb5 TG |
2303 | u32 pid = 0, seq = 0; |
2304 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2305 | int err = -ENOBUFS; |
2306 | ||
86872cb5 TG |
2307 | if (info) { |
2308 | pid = info->pid; | |
2309 | nlh = info->nlh; | |
2310 | if (nlh) | |
2311 | seq = nlh->nlmsg_seq; | |
2312 | } | |
2313 | ||
339bf98f | 2314 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2315 | if (skb == NULL) |
2316 | goto errout; | |
2317 | ||
2318 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
26932566 PM |
2319 | if (err < 0) { |
2320 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2321 | WARN_ON(err == -EMSGSIZE); | |
2322 | kfree_skb(skb); | |
2323 | goto errout; | |
2324 | } | |
21713ebc TG |
2325 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); |
2326 | errout: | |
2327 | if (err < 0) | |
2328 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); | |
1da177e4 LT |
2329 | } |
2330 | ||
2331 | /* | |
2332 | * /proc | |
2333 | */ | |
2334 | ||
2335 | #ifdef CONFIG_PROC_FS | |
2336 | ||
2337 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2338 | ||
2339 | struct rt6_proc_arg | |
2340 | { | |
2341 | char *buffer; | |
2342 | int offset; | |
2343 | int length; | |
2344 | int skip; | |
2345 | int len; | |
2346 | }; | |
2347 | ||
2348 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2349 | { | |
2350 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
1da177e4 LT |
2351 | |
2352 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2353 | arg->skip++; | |
2354 | return 0; | |
2355 | } | |
2356 | ||
2357 | if (arg->len >= arg->length) | |
2358 | return 0; | |
2359 | ||
33e93c96 YH |
2360 | arg->len += sprintf(arg->buffer + arg->len, |
2361 | NIP6_SEQFMT " %02x ", | |
2362 | NIP6(rt->rt6i_dst.addr), | |
1da177e4 LT |
2363 | rt->rt6i_dst.plen); |
2364 | ||
2365 | #ifdef CONFIG_IPV6_SUBTREES | |
33e93c96 YH |
2366 | arg->len += sprintf(arg->buffer + arg->len, |
2367 | NIP6_SEQFMT " %02x ", | |
2368 | NIP6(rt->rt6i_src.addr), | |
1da177e4 LT |
2369 | rt->rt6i_src.plen); |
2370 | #else | |
33e93c96 YH |
2371 | arg->len += sprintf(arg->buffer + arg->len, |
2372 | "00000000000000000000000000000000 00 "); | |
1da177e4 LT |
2373 | #endif |
2374 | ||
2375 | if (rt->rt6i_nexthop) { | |
33e93c96 YH |
2376 | arg->len += sprintf(arg->buffer + arg->len, |
2377 | NIP6_SEQFMT, | |
2378 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2379 | } else { |
33e93c96 YH |
2380 | arg->len += sprintf(arg->buffer + arg->len, |
2381 | "00000000000000000000000000000000"); | |
1da177e4 LT |
2382 | } |
2383 | arg->len += sprintf(arg->buffer + arg->len, | |
2384 | " %08x %08x %08x %08x %8s\n", | |
2385 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
1ab1457c | 2386 | rt->u.dst.__use, rt->rt6i_flags, |
1da177e4 LT |
2387 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
2388 | return 0; | |
2389 | } | |
2390 | ||
2391 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2392 | { | |
c71099ac TG |
2393 | struct rt6_proc_arg arg = { |
2394 | .buffer = buffer, | |
2395 | .offset = offset, | |
2396 | .length = length, | |
2397 | }; | |
1da177e4 | 2398 | |
c71099ac | 2399 | fib6_clean_all(rt6_info_route, 0, &arg); |
1da177e4 LT |
2400 | |
2401 | *start = buffer; | |
2402 | if (offset) | |
2403 | *start += offset % RT6_INFO_LEN; | |
2404 | ||
2405 | arg.len -= offset % RT6_INFO_LEN; | |
2406 | ||
2407 | if (arg.len > length) | |
2408 | arg.len = length; | |
2409 | if (arg.len < 0) | |
2410 | arg.len = 0; | |
2411 | ||
2412 | return arg.len; | |
2413 | } | |
2414 | ||
1da177e4 LT |
2415 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2416 | { | |
2417 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2418 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2419 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2420 | rt6_stats.fib_rt_cache, | |
2421 | atomic_read(&ip6_dst_ops.entries), | |
2422 | rt6_stats.fib_discarded_routes); | |
2423 | ||
2424 | return 0; | |
2425 | } | |
2426 | ||
2427 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2428 | { | |
2429 | return single_open(file, rt6_stats_seq_show, NULL); | |
2430 | } | |
2431 | ||
9a32144e | 2432 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2433 | .owner = THIS_MODULE, |
2434 | .open = rt6_stats_seq_open, | |
2435 | .read = seq_read, | |
2436 | .llseek = seq_lseek, | |
2437 | .release = single_release, | |
2438 | }; | |
2439 | #endif /* CONFIG_PROC_FS */ | |
2440 | ||
2441 | #ifdef CONFIG_SYSCTL | |
2442 | ||
2443 | static int flush_delay; | |
2444 | ||
2445 | static | |
2446 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2447 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2448 | { | |
2449 | if (write) { | |
2450 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2451 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2452 | return 0; | |
2453 | } else | |
2454 | return -EINVAL; | |
2455 | } | |
2456 | ||
2457 | ctl_table ipv6_route_table[] = { | |
1ab1457c YH |
2458 | { |
2459 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
1da177e4 | 2460 | .procname = "flush", |
1ab1457c | 2461 | .data = &flush_delay, |
1da177e4 | 2462 | .maxlen = sizeof(int), |
89c8b3a1 | 2463 | .mode = 0200, |
1ab1457c | 2464 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2465 | }, |
2466 | { | |
2467 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2468 | .procname = "gc_thresh", | |
1ab1457c | 2469 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2470 | .maxlen = sizeof(int), |
2471 | .mode = 0644, | |
1ab1457c | 2472 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2473 | }, |
2474 | { | |
2475 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2476 | .procname = "max_size", | |
1ab1457c | 2477 | .data = &ip6_rt_max_size, |
1da177e4 LT |
2478 | .maxlen = sizeof(int), |
2479 | .mode = 0644, | |
1ab1457c | 2480 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2481 | }, |
2482 | { | |
2483 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2484 | .procname = "gc_min_interval", | |
1ab1457c | 2485 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2486 | .maxlen = sizeof(int), |
2487 | .mode = 0644, | |
1ab1457c | 2488 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2489 | .strategy = &sysctl_jiffies, |
2490 | }, | |
2491 | { | |
2492 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2493 | .procname = "gc_timeout", | |
1ab1457c | 2494 | .data = &ip6_rt_gc_timeout, |
1da177e4 LT |
2495 | .maxlen = sizeof(int), |
2496 | .mode = 0644, | |
1ab1457c | 2497 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2498 | .strategy = &sysctl_jiffies, |
2499 | }, | |
2500 | { | |
2501 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2502 | .procname = "gc_interval", | |
1ab1457c | 2503 | .data = &ip6_rt_gc_interval, |
1da177e4 LT |
2504 | .maxlen = sizeof(int), |
2505 | .mode = 0644, | |
1ab1457c | 2506 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2507 | .strategy = &sysctl_jiffies, |
2508 | }, | |
2509 | { | |
2510 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2511 | .procname = "gc_elasticity", | |
1ab1457c | 2512 | .data = &ip6_rt_gc_elasticity, |
1da177e4 LT |
2513 | .maxlen = sizeof(int), |
2514 | .mode = 0644, | |
1ab1457c | 2515 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2516 | .strategy = &sysctl_jiffies, |
2517 | }, | |
2518 | { | |
2519 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2520 | .procname = "mtu_expires", | |
1ab1457c | 2521 | .data = &ip6_rt_mtu_expires, |
1da177e4 LT |
2522 | .maxlen = sizeof(int), |
2523 | .mode = 0644, | |
1ab1457c | 2524 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2525 | .strategy = &sysctl_jiffies, |
2526 | }, | |
2527 | { | |
2528 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2529 | .procname = "min_adv_mss", | |
1ab1457c | 2530 | .data = &ip6_rt_min_advmss, |
1da177e4 LT |
2531 | .maxlen = sizeof(int), |
2532 | .mode = 0644, | |
1ab1457c | 2533 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2534 | .strategy = &sysctl_jiffies, |
2535 | }, | |
2536 | { | |
2537 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2538 | .procname = "gc_min_interval_ms", | |
1ab1457c | 2539 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2540 | .maxlen = sizeof(int), |
2541 | .mode = 0644, | |
1ab1457c | 2542 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2543 | .strategy = &sysctl_ms_jiffies, |
2544 | }, | |
2545 | { .ctl_name = 0 } | |
2546 | }; | |
2547 | ||
2548 | #endif | |
2549 | ||
2550 | void __init ip6_route_init(void) | |
2551 | { | |
952a10be | 2552 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2553 | struct proc_dir_entry *p; |
952a10be | 2554 | #endif |
e5d679f3 AD |
2555 | ip6_dst_ops.kmem_cachep = |
2556 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
20c2df83 | 2557 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
14e50e57 DM |
2558 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2559 | ||
1da177e4 LT |
2560 | fib6_init(); |
2561 | #ifdef CONFIG_PROC_FS | |
457c4cbc | 2562 | p = proc_net_create(&init_net, "ipv6_route", 0, rt6_proc_info); |
1da177e4 LT |
2563 | if (p) |
2564 | p->owner = THIS_MODULE; | |
2565 | ||
457c4cbc | 2566 | proc_net_fops_create(&init_net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); |
1da177e4 LT |
2567 | #endif |
2568 | #ifdef CONFIG_XFRM | |
2569 | xfrm6_init(); | |
2570 | #endif | |
101367c2 TG |
2571 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2572 | fib6_rules_init(); | |
2573 | #endif | |
c127ea2c TG |
2574 | |
2575 | __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL); | |
2576 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL); | |
2577 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL); | |
1da177e4 LT |
2578 | } |
2579 | ||
2580 | void ip6_route_cleanup(void) | |
2581 | { | |
101367c2 TG |
2582 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2583 | fib6_rules_cleanup(); | |
2584 | #endif | |
1da177e4 | 2585 | #ifdef CONFIG_PROC_FS |
457c4cbc EB |
2586 | proc_net_remove(&init_net, "ipv6_route"); |
2587 | proc_net_remove(&init_net, "rt6_stats"); | |
1da177e4 LT |
2588 | #endif |
2589 | #ifdef CONFIG_XFRM | |
2590 | xfrm6_fini(); | |
2591 | #endif | |
2592 | rt6_ifdown(NULL); | |
2593 | fib6_gc_cleanup(); | |
2594 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2595 | } |