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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 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 | ||
47 | #include <net/snmp.h> | |
48 | #include <net/ipv6.h> | |
49 | #include <net/ip6_fib.h> | |
50 | #include <net/ip6_route.h> | |
51 | #include <net/ndisc.h> | |
52 | #include <net/addrconf.h> | |
53 | #include <net/tcp.h> | |
54 | #include <linux/rtnetlink.h> | |
55 | #include <net/dst.h> | |
56 | #include <net/xfrm.h> | |
8d71740c | 57 | #include <net/netevent.h> |
21713ebc | 58 | #include <net/netlink.h> |
1da177e4 LT |
59 | |
60 | #include <asm/uaccess.h> | |
61 | ||
62 | #ifdef CONFIG_SYSCTL | |
63 | #include <linux/sysctl.h> | |
64 | #endif | |
65 | ||
66 | /* Set to 3 to get tracing. */ | |
67 | #define RT6_DEBUG 2 | |
68 | ||
69 | #if RT6_DEBUG >= 3 | |
70 | #define RDBG(x) printk x | |
71 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
72 | #else | |
73 | #define RDBG(x) | |
74 | #define RT6_TRACE(x...) do { ; } while (0) | |
75 | #endif | |
76 | ||
519fbd87 | 77 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 LT |
78 | |
79 | static int ip6_rt_max_size = 4096; | |
80 | static int ip6_rt_gc_min_interval = HZ / 2; | |
81 | static int ip6_rt_gc_timeout = 60*HZ; | |
82 | int ip6_rt_gc_interval = 30*HZ; | |
83 | static int ip6_rt_gc_elasticity = 9; | |
84 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
85 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
86 | ||
87 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
88 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
89 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
90 | static void ip6_dst_destroy(struct dst_entry *); | |
91 | static void ip6_dst_ifdown(struct dst_entry *, | |
92 | struct net_device *dev, int how); | |
93 | static int ip6_dst_gc(void); | |
94 | ||
95 | static int ip6_pkt_discard(struct sk_buff *skb); | |
96 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
97 | static void ip6_link_failure(struct sk_buff *skb); | |
98 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
99 | ||
70ceb4f5 YH |
100 | #ifdef CONFIG_IPV6_ROUTE_INFO |
101 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
102 | struct in6_addr *gwaddr, int ifindex, | |
103 | unsigned pref); | |
104 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
105 | struct in6_addr *gwaddr, int ifindex); | |
106 | #endif | |
107 | ||
1da177e4 LT |
108 | static struct dst_ops ip6_dst_ops = { |
109 | .family = AF_INET6, | |
110 | .protocol = __constant_htons(ETH_P_IPV6), | |
111 | .gc = ip6_dst_gc, | |
112 | .gc_thresh = 1024, | |
113 | .check = ip6_dst_check, | |
114 | .destroy = ip6_dst_destroy, | |
115 | .ifdown = ip6_dst_ifdown, | |
116 | .negative_advice = ip6_negative_advice, | |
117 | .link_failure = ip6_link_failure, | |
118 | .update_pmtu = ip6_rt_update_pmtu, | |
119 | .entry_size = sizeof(struct rt6_info), | |
120 | }; | |
121 | ||
14e50e57 DM |
122 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
123 | { | |
124 | } | |
125 | ||
126 | static struct dst_ops ip6_dst_blackhole_ops = { | |
127 | .family = AF_INET6, | |
128 | .protocol = __constant_htons(ETH_P_IPV6), | |
129 | .destroy = ip6_dst_destroy, | |
130 | .check = ip6_dst_check, | |
131 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
132 | .entry_size = sizeof(struct rt6_info), | |
133 | }; | |
134 | ||
1da177e4 LT |
135 | struct rt6_info ip6_null_entry = { |
136 | .u = { | |
137 | .dst = { | |
138 | .__refcnt = ATOMIC_INIT(1), | |
139 | .__use = 1, | |
140 | .dev = &loopback_dev, | |
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, | |
166 | .dev = &loopback_dev, | |
167 | .obsolete = -1, | |
168 | .error = -EACCES, | |
169 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
170 | .input = ip6_pkt_prohibit, |
171 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
172 | .ops = &ip6_dst_ops, |
173 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
174 | } | |
175 | }, | |
176 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
177 | .rt6i_metric = ~(u32) 0, | |
178 | .rt6i_ref = ATOMIC_INIT(1), | |
179 | }; | |
180 | ||
181 | struct rt6_info ip6_blk_hole_entry = { | |
182 | .u = { | |
183 | .dst = { | |
184 | .__refcnt = ATOMIC_INIT(1), | |
185 | .__use = 1, | |
186 | .dev = &loopback_dev, | |
187 | .obsolete = -1, | |
188 | .error = -EINVAL, | |
189 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
190 | .input = ip6_pkt_blk_hole, |
191 | .output = ip6_pkt_blk_hole, | |
101367c2 TG |
192 | .ops = &ip6_dst_ops, |
193 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
194 | } | |
195 | }, | |
196 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
197 | .rt6i_metric = ~(u32) 0, | |
198 | .rt6i_ref = ATOMIC_INIT(1), | |
199 | }; | |
200 | ||
201 | #endif | |
202 | ||
1da177e4 LT |
203 | /* allocate dst with ip6_dst_ops */ |
204 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
205 | { | |
206 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
207 | } | |
208 | ||
209 | static void ip6_dst_destroy(struct dst_entry *dst) | |
210 | { | |
211 | struct rt6_info *rt = (struct rt6_info *)dst; | |
212 | struct inet6_dev *idev = rt->rt6i_idev; | |
213 | ||
214 | if (idev != NULL) { | |
215 | rt->rt6i_idev = NULL; | |
216 | in6_dev_put(idev); | |
1ab1457c | 217 | } |
1da177e4 LT |
218 | } |
219 | ||
220 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
221 | int how) | |
222 | { | |
223 | struct rt6_info *rt = (struct rt6_info *)dst; | |
224 | struct inet6_dev *idev = rt->rt6i_idev; | |
225 | ||
226 | if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { | |
227 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); | |
228 | if (loopback_idev != NULL) { | |
229 | rt->rt6i_idev = loopback_idev; | |
230 | in6_dev_put(idev); | |
231 | } | |
232 | } | |
233 | } | |
234 | ||
235 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
236 | { | |
237 | return (rt->rt6i_flags & RTF_EXPIRES && | |
238 | time_after(jiffies, rt->rt6i_expires)); | |
239 | } | |
240 | ||
c71099ac TG |
241 | static inline int rt6_need_strict(struct in6_addr *daddr) |
242 | { | |
243 | return (ipv6_addr_type(daddr) & | |
244 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
245 | } | |
246 | ||
1da177e4 | 247 | /* |
c71099ac | 248 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
249 | */ |
250 | ||
251 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
252 | int oif, | |
253 | int strict) | |
254 | { | |
255 | struct rt6_info *local = NULL; | |
256 | struct rt6_info *sprt; | |
257 | ||
258 | if (oif) { | |
7cc48263 | 259 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
260 | struct net_device *dev = sprt->rt6i_dev; |
261 | if (dev->ifindex == oif) | |
262 | return sprt; | |
263 | if (dev->flags & IFF_LOOPBACK) { | |
264 | if (sprt->rt6i_idev == NULL || | |
265 | sprt->rt6i_idev->dev->ifindex != oif) { | |
266 | if (strict && oif) | |
267 | continue; | |
1ab1457c | 268 | if (local && (!oif || |
1da177e4 LT |
269 | local->rt6i_idev->dev->ifindex == oif)) |
270 | continue; | |
271 | } | |
272 | local = sprt; | |
273 | } | |
274 | } | |
275 | ||
276 | if (local) | |
277 | return local; | |
278 | ||
279 | if (strict) | |
280 | return &ip6_null_entry; | |
281 | } | |
282 | return rt; | |
283 | } | |
284 | ||
27097255 YH |
285 | #ifdef CONFIG_IPV6_ROUTER_PREF |
286 | static void rt6_probe(struct rt6_info *rt) | |
287 | { | |
288 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
289 | /* | |
290 | * Okay, this does not seem to be appropriate | |
291 | * for now, however, we need to check if it | |
292 | * is really so; aka Router Reachability Probing. | |
293 | * | |
294 | * Router Reachability Probe MUST be rate-limited | |
295 | * to no more than one per minute. | |
296 | */ | |
297 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
298 | return; | |
299 | read_lock_bh(&neigh->lock); | |
300 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 301 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
302 | struct in6_addr mcaddr; |
303 | struct in6_addr *target; | |
304 | ||
305 | neigh->updated = jiffies; | |
306 | read_unlock_bh(&neigh->lock); | |
307 | ||
308 | target = (struct in6_addr *)&neigh->primary_key; | |
309 | addrconf_addr_solict_mult(target, &mcaddr); | |
310 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
311 | } else | |
312 | read_unlock_bh(&neigh->lock); | |
313 | } | |
314 | #else | |
315 | static inline void rt6_probe(struct rt6_info *rt) | |
316 | { | |
317 | return; | |
318 | } | |
319 | #endif | |
320 | ||
1da177e4 | 321 | /* |
554cfb7e | 322 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 323 | */ |
b6f99a21 | 324 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
325 | { |
326 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 327 | if (!oif || dev->ifindex == oif) |
554cfb7e | 328 | return 2; |
161980f4 DM |
329 | if ((dev->flags & IFF_LOOPBACK) && |
330 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
331 | return 1; | |
332 | return 0; | |
554cfb7e | 333 | } |
1da177e4 | 334 | |
b6f99a21 | 335 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 336 | { |
554cfb7e YH |
337 | struct neighbour *neigh = rt->rt6i_nexthop; |
338 | int m = 0; | |
4d0c5911 YH |
339 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
340 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
341 | m = 1; | |
342 | else if (neigh) { | |
554cfb7e YH |
343 | read_lock_bh(&neigh->lock); |
344 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 345 | m = 2; |
ea73ee23 YH |
346 | else if (!(neigh->nud_state & NUD_FAILED)) |
347 | m = 1; | |
554cfb7e | 348 | read_unlock_bh(&neigh->lock); |
1da177e4 | 349 | } |
554cfb7e | 350 | return m; |
1da177e4 LT |
351 | } |
352 | ||
554cfb7e YH |
353 | static int rt6_score_route(struct rt6_info *rt, int oif, |
354 | int strict) | |
1da177e4 | 355 | { |
4d0c5911 | 356 | int m, n; |
1ab1457c | 357 | |
4d0c5911 | 358 | m = rt6_check_dev(rt, oif); |
77d16f45 | 359 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 360 | return -1; |
ebacaaa0 YH |
361 | #ifdef CONFIG_IPV6_ROUTER_PREF |
362 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
363 | #endif | |
4d0c5911 | 364 | n = rt6_check_neigh(rt); |
557e92ef | 365 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
366 | return -1; |
367 | return m; | |
368 | } | |
369 | ||
f11e6659 DM |
370 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
371 | int *mpri, struct rt6_info *match) | |
554cfb7e | 372 | { |
f11e6659 DM |
373 | int m; |
374 | ||
375 | if (rt6_check_expired(rt)) | |
376 | goto out; | |
377 | ||
378 | m = rt6_score_route(rt, oif, strict); | |
379 | if (m < 0) | |
380 | goto out; | |
381 | ||
382 | if (m > *mpri) { | |
383 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
384 | rt6_probe(match); | |
385 | *mpri = m; | |
386 | match = rt; | |
387 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
388 | rt6_probe(rt); | |
389 | } | |
390 | ||
391 | out: | |
392 | return match; | |
393 | } | |
394 | ||
395 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
396 | struct rt6_info *rr_head, | |
397 | u32 metric, int oif, int strict) | |
398 | { | |
399 | struct rt6_info *rt, *match; | |
554cfb7e | 400 | int mpri = -1; |
1da177e4 | 401 | |
f11e6659 DM |
402 | match = NULL; |
403 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
404 | rt = rt->u.dst.rt6_next) | |
405 | match = find_match(rt, oif, strict, &mpri, match); | |
406 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
407 | rt = rt->u.dst.rt6_next) | |
408 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 409 | |
f11e6659 DM |
410 | return match; |
411 | } | |
1da177e4 | 412 | |
f11e6659 DM |
413 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
414 | { | |
415 | struct rt6_info *match, *rt0; | |
1da177e4 | 416 | |
f11e6659 DM |
417 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
418 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 419 | |
f11e6659 DM |
420 | rt0 = fn->rr_ptr; |
421 | if (!rt0) | |
422 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 423 | |
f11e6659 | 424 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 425 | |
554cfb7e | 426 | if (!match && |
f11e6659 DM |
427 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
428 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
429 | ||
554cfb7e | 430 | /* no entries matched; do round-robin */ |
f11e6659 DM |
431 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
432 | next = fn->leaf; | |
433 | ||
434 | if (next != rt0) | |
435 | fn->rr_ptr = next; | |
1da177e4 | 436 | } |
1da177e4 | 437 | |
f11e6659 DM |
438 | RT6_TRACE("%s() => %p\n", |
439 | __FUNCTION__, match); | |
1da177e4 | 440 | |
554cfb7e | 441 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
442 | } |
443 | ||
70ceb4f5 YH |
444 | #ifdef CONFIG_IPV6_ROUTE_INFO |
445 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
446 | struct in6_addr *gwaddr) | |
447 | { | |
448 | struct route_info *rinfo = (struct route_info *) opt; | |
449 | struct in6_addr prefix_buf, *prefix; | |
450 | unsigned int pref; | |
451 | u32 lifetime; | |
452 | struct rt6_info *rt; | |
453 | ||
454 | if (len < sizeof(struct route_info)) { | |
455 | return -EINVAL; | |
456 | } | |
457 | ||
458 | /* Sanity check for prefix_len and length */ | |
459 | if (rinfo->length > 3) { | |
460 | return -EINVAL; | |
461 | } else if (rinfo->prefix_len > 128) { | |
462 | return -EINVAL; | |
463 | } else if (rinfo->prefix_len > 64) { | |
464 | if (rinfo->length < 2) { | |
465 | return -EINVAL; | |
466 | } | |
467 | } else if (rinfo->prefix_len > 0) { | |
468 | if (rinfo->length < 1) { | |
469 | return -EINVAL; | |
470 | } | |
471 | } | |
472 | ||
473 | pref = rinfo->route_pref; | |
474 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
475 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
476 | ||
e69a4adc | 477 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
478 | if (lifetime == 0xffffffff) { |
479 | /* infinity */ | |
480 | } else if (lifetime > 0x7fffffff/HZ) { | |
481 | /* Avoid arithmetic overflow */ | |
482 | lifetime = 0x7fffffff/HZ - 1; | |
483 | } | |
484 | ||
485 | if (rinfo->length == 3) | |
486 | prefix = (struct in6_addr *)rinfo->prefix; | |
487 | else { | |
488 | /* this function is safe */ | |
489 | ipv6_addr_prefix(&prefix_buf, | |
490 | (struct in6_addr *)rinfo->prefix, | |
491 | rinfo->prefix_len); | |
492 | prefix = &prefix_buf; | |
493 | } | |
494 | ||
495 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
496 | ||
497 | if (rt && !lifetime) { | |
e0a1ad73 | 498 | ip6_del_rt(rt); |
70ceb4f5 YH |
499 | rt = NULL; |
500 | } | |
501 | ||
502 | if (!rt && lifetime) | |
503 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
504 | pref); | |
505 | else if (rt) | |
506 | rt->rt6i_flags = RTF_ROUTEINFO | | |
507 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
508 | ||
509 | if (rt) { | |
510 | if (lifetime == 0xffffffff) { | |
511 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
512 | } else { | |
513 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
514 | rt->rt6i_flags |= RTF_EXPIRES; | |
515 | } | |
516 | dst_release(&rt->u.dst); | |
517 | } | |
518 | return 0; | |
519 | } | |
520 | #endif | |
521 | ||
982f56f3 YH |
522 | #define BACKTRACK(saddr) \ |
523 | do { \ | |
524 | if (rt == &ip6_null_entry) { \ | |
525 | struct fib6_node *pn; \ | |
e0eda7bb | 526 | while (1) { \ |
982f56f3 YH |
527 | if (fn->fn_flags & RTN_TL_ROOT) \ |
528 | goto out; \ | |
529 | pn = fn->parent; \ | |
530 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 531 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
532 | else \ |
533 | fn = pn; \ | |
534 | if (fn->fn_flags & RTN_RTINFO) \ | |
535 | goto restart; \ | |
c71099ac | 536 | } \ |
c71099ac | 537 | } \ |
982f56f3 | 538 | } while(0) |
c71099ac TG |
539 | |
540 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
541 | struct flowi *fl, int flags) | |
1da177e4 LT |
542 | { |
543 | struct fib6_node *fn; | |
544 | struct rt6_info *rt; | |
545 | ||
c71099ac TG |
546 | read_lock_bh(&table->tb6_lock); |
547 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
548 | restart: | |
549 | rt = fn->leaf; | |
77d16f45 | 550 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 551 | BACKTRACK(&fl->fl6_src); |
c71099ac | 552 | out: |
33cc4896 | 553 | dst_hold(&rt->u.dst); |
c71099ac | 554 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
555 | |
556 | rt->u.dst.lastuse = jiffies; | |
c71099ac TG |
557 | rt->u.dst.__use++; |
558 | ||
559 | return rt; | |
560 | ||
561 | } | |
562 | ||
563 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
564 | int oif, int strict) | |
565 | { | |
566 | struct flowi fl = { | |
567 | .oif = oif, | |
568 | .nl_u = { | |
569 | .ip6_u = { | |
570 | .daddr = *daddr, | |
c71099ac TG |
571 | }, |
572 | }, | |
573 | }; | |
574 | struct dst_entry *dst; | |
77d16f45 | 575 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 576 | |
adaa70bb TG |
577 | if (saddr) { |
578 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
579 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
580 | } | |
581 | ||
c71099ac TG |
582 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
583 | if (dst->error == 0) | |
584 | return (struct rt6_info *) dst; | |
585 | ||
586 | dst_release(dst); | |
587 | ||
1da177e4 LT |
588 | return NULL; |
589 | } | |
590 | ||
7159039a YH |
591 | EXPORT_SYMBOL(rt6_lookup); |
592 | ||
c71099ac | 593 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
594 | It takes new route entry, the addition fails by any reason the |
595 | route is freed. In any case, if caller does not hold it, it may | |
596 | be destroyed. | |
597 | */ | |
598 | ||
86872cb5 | 599 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
600 | { |
601 | int err; | |
c71099ac | 602 | struct fib6_table *table; |
1da177e4 | 603 | |
c71099ac TG |
604 | table = rt->rt6i_table; |
605 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 606 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 607 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
608 | |
609 | return err; | |
610 | } | |
611 | ||
40e22e8f TG |
612 | int ip6_ins_rt(struct rt6_info *rt) |
613 | { | |
86872cb5 | 614 | return __ip6_ins_rt(rt, NULL); |
40e22e8f TG |
615 | } |
616 | ||
95a9a5ba YH |
617 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
618 | struct in6_addr *saddr) | |
1da177e4 | 619 | { |
1da177e4 LT |
620 | struct rt6_info *rt; |
621 | ||
622 | /* | |
623 | * Clone the route. | |
624 | */ | |
625 | ||
626 | rt = ip6_rt_copy(ort); | |
627 | ||
628 | if (rt) { | |
58c4fb86 YH |
629 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
630 | if (rt->rt6i_dst.plen != 128 && | |
631 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
632 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 633 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 634 | } |
1da177e4 | 635 | |
58c4fb86 | 636 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
637 | rt->rt6i_dst.plen = 128; |
638 | rt->rt6i_flags |= RTF_CACHE; | |
639 | rt->u.dst.flags |= DST_HOST; | |
640 | ||
641 | #ifdef CONFIG_IPV6_SUBTREES | |
642 | if (rt->rt6i_src.plen && saddr) { | |
643 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
644 | rt->rt6i_src.plen = 128; | |
645 | } | |
646 | #endif | |
647 | ||
648 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
649 | ||
95a9a5ba | 650 | } |
1da177e4 | 651 | |
95a9a5ba YH |
652 | return rt; |
653 | } | |
1da177e4 | 654 | |
299d9939 YH |
655 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
656 | { | |
657 | struct rt6_info *rt = ip6_rt_copy(ort); | |
658 | if (rt) { | |
659 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
660 | rt->rt6i_dst.plen = 128; | |
661 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
662 | rt->u.dst.flags |= DST_HOST; |
663 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
664 | } | |
665 | return rt; | |
666 | } | |
667 | ||
8ce11e6a AB |
668 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
669 | struct flowi *fl, int flags) | |
1da177e4 LT |
670 | { |
671 | struct fib6_node *fn; | |
519fbd87 | 672 | struct rt6_info *rt, *nrt; |
c71099ac | 673 | int strict = 0; |
1da177e4 | 674 | int attempts = 3; |
519fbd87 | 675 | int err; |
ea659e07 | 676 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 677 | |
77d16f45 | 678 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
679 | |
680 | relookup: | |
c71099ac | 681 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 682 | |
8238dd06 | 683 | restart_2: |
c71099ac | 684 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
685 | |
686 | restart: | |
f11e6659 | 687 | rt = rt6_select(fn, fl->iif, strict | reachable); |
982f56f3 | 688 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
689 | if (rt == &ip6_null_entry || |
690 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 691 | goto out; |
1da177e4 | 692 | |
fb9de91e | 693 | dst_hold(&rt->u.dst); |
c71099ac | 694 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 695 | |
519fbd87 | 696 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 697 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
698 | else { |
699 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 700 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
701 | #else |
702 | goto out2; | |
703 | #endif | |
704 | } | |
e40cf353 | 705 | |
519fbd87 YH |
706 | dst_release(&rt->u.dst); |
707 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 708 | |
519fbd87 YH |
709 | dst_hold(&rt->u.dst); |
710 | if (nrt) { | |
40e22e8f | 711 | err = ip6_ins_rt(nrt); |
519fbd87 | 712 | if (!err) |
1da177e4 | 713 | goto out2; |
1da177e4 | 714 | } |
1da177e4 | 715 | |
519fbd87 YH |
716 | if (--attempts <= 0) |
717 | goto out2; | |
718 | ||
719 | /* | |
c71099ac | 720 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
721 | * released someone could insert this route. Relookup. |
722 | */ | |
723 | dst_release(&rt->u.dst); | |
724 | goto relookup; | |
725 | ||
726 | out: | |
8238dd06 YH |
727 | if (reachable) { |
728 | reachable = 0; | |
729 | goto restart_2; | |
730 | } | |
519fbd87 | 731 | dst_hold(&rt->u.dst); |
c71099ac | 732 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
733 | out2: |
734 | rt->u.dst.lastuse = jiffies; | |
735 | rt->u.dst.__use++; | |
c71099ac TG |
736 | |
737 | return rt; | |
1da177e4 LT |
738 | } |
739 | ||
c71099ac TG |
740 | void ip6_route_input(struct sk_buff *skb) |
741 | { | |
0660e03f | 742 | struct ipv6hdr *iph = ipv6_hdr(skb); |
adaa70bb | 743 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
744 | struct flowi fl = { |
745 | .iif = skb->dev->ifindex, | |
746 | .nl_u = { | |
747 | .ip6_u = { | |
748 | .daddr = iph->daddr, | |
749 | .saddr = iph->saddr, | |
90bcaf7b | 750 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
751 | }, |
752 | }, | |
1ab1457c | 753 | .mark = skb->mark, |
c71099ac TG |
754 | .proto = iph->nexthdr, |
755 | }; | |
adaa70bb TG |
756 | |
757 | if (rt6_need_strict(&iph->daddr)) | |
758 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
759 | |
760 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
761 | } | |
762 | ||
763 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
764 | struct flowi *fl, int flags) | |
1da177e4 LT |
765 | { |
766 | struct fib6_node *fn; | |
519fbd87 | 767 | struct rt6_info *rt, *nrt; |
c71099ac | 768 | int strict = 0; |
1da177e4 | 769 | int attempts = 3; |
519fbd87 | 770 | int err; |
ea659e07 | 771 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 772 | |
77d16f45 | 773 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
774 | |
775 | relookup: | |
c71099ac | 776 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 777 | |
8238dd06 | 778 | restart_2: |
c71099ac | 779 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
780 | |
781 | restart: | |
f11e6659 | 782 | rt = rt6_select(fn, fl->oif, strict | reachable); |
982f56f3 | 783 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
784 | if (rt == &ip6_null_entry || |
785 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 786 | goto out; |
1da177e4 | 787 | |
fb9de91e | 788 | dst_hold(&rt->u.dst); |
c71099ac | 789 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 790 | |
519fbd87 | 791 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 792 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
793 | else { |
794 | #if CLONE_OFFLINK_ROUTE | |
795 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
796 | #else | |
797 | goto out2; | |
798 | #endif | |
799 | } | |
1da177e4 | 800 | |
519fbd87 YH |
801 | dst_release(&rt->u.dst); |
802 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 803 | |
519fbd87 YH |
804 | dst_hold(&rt->u.dst); |
805 | if (nrt) { | |
40e22e8f | 806 | err = ip6_ins_rt(nrt); |
519fbd87 | 807 | if (!err) |
1da177e4 | 808 | goto out2; |
1da177e4 | 809 | } |
e40cf353 | 810 | |
519fbd87 YH |
811 | if (--attempts <= 0) |
812 | goto out2; | |
813 | ||
814 | /* | |
c71099ac | 815 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
816 | * released someone could insert this route. Relookup. |
817 | */ | |
818 | dst_release(&rt->u.dst); | |
819 | goto relookup; | |
820 | ||
821 | out: | |
8238dd06 YH |
822 | if (reachable) { |
823 | reachable = 0; | |
824 | goto restart_2; | |
825 | } | |
519fbd87 | 826 | dst_hold(&rt->u.dst); |
c71099ac | 827 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
828 | out2: |
829 | rt->u.dst.lastuse = jiffies; | |
830 | rt->u.dst.__use++; | |
c71099ac TG |
831 | return rt; |
832 | } | |
833 | ||
834 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
835 | { | |
836 | int flags = 0; | |
837 | ||
838 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 839 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 840 | |
adaa70bb TG |
841 | if (!ipv6_addr_any(&fl->fl6_src)) |
842 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
843 | ||
c71099ac | 844 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
845 | } |
846 | ||
7159039a | 847 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 848 | |
14e50e57 DM |
849 | static int ip6_blackhole_output(struct sk_buff *skb) |
850 | { | |
851 | kfree_skb(skb); | |
852 | return 0; | |
853 | } | |
854 | ||
855 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) | |
856 | { | |
857 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
858 | struct rt6_info *rt = (struct rt6_info *) | |
859 | dst_alloc(&ip6_dst_blackhole_ops); | |
860 | struct dst_entry *new = NULL; | |
861 | ||
862 | if (rt) { | |
863 | new = &rt->u.dst; | |
864 | ||
865 | atomic_set(&new->__refcnt, 1); | |
866 | new->__use = 1; | |
867 | new->input = ip6_blackhole_output; | |
868 | new->output = ip6_blackhole_output; | |
869 | ||
870 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
871 | new->dev = ort->u.dst.dev; | |
872 | if (new->dev) | |
873 | dev_hold(new->dev); | |
874 | rt->rt6i_idev = ort->rt6i_idev; | |
875 | if (rt->rt6i_idev) | |
876 | in6_dev_hold(rt->rt6i_idev); | |
877 | rt->rt6i_expires = 0; | |
878 | ||
879 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
880 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
881 | rt->rt6i_metric = 0; | |
882 | ||
883 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
884 | #ifdef CONFIG_IPV6_SUBTREES | |
885 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
886 | #endif | |
887 | ||
888 | dst_free(new); | |
889 | } | |
890 | ||
891 | dst_release(*dstp); | |
892 | *dstp = new; | |
893 | return (new ? 0 : -ENOMEM); | |
894 | } | |
895 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
896 | ||
1da177e4 LT |
897 | /* |
898 | * Destination cache support functions | |
899 | */ | |
900 | ||
901 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
902 | { | |
903 | struct rt6_info *rt; | |
904 | ||
905 | rt = (struct rt6_info *) dst; | |
906 | ||
907 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
908 | return dst; | |
909 | ||
910 | return NULL; | |
911 | } | |
912 | ||
913 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
914 | { | |
915 | struct rt6_info *rt = (struct rt6_info *) dst; | |
916 | ||
917 | if (rt) { | |
918 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 919 | ip6_del_rt(rt); |
1da177e4 LT |
920 | else |
921 | dst_release(dst); | |
922 | } | |
923 | return NULL; | |
924 | } | |
925 | ||
926 | static void ip6_link_failure(struct sk_buff *skb) | |
927 | { | |
928 | struct rt6_info *rt; | |
929 | ||
930 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
931 | ||
932 | rt = (struct rt6_info *) skb->dst; | |
933 | if (rt) { | |
934 | if (rt->rt6i_flags&RTF_CACHE) { | |
935 | dst_set_expires(&rt->u.dst, 0); | |
936 | rt->rt6i_flags |= RTF_EXPIRES; | |
937 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
938 | rt->rt6i_node->fn_sernum = -1; | |
939 | } | |
940 | } | |
941 | ||
942 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
943 | { | |
944 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
945 | ||
946 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
947 | rt6->rt6i_flags |= RTF_MODIFIED; | |
948 | if (mtu < IPV6_MIN_MTU) { | |
949 | mtu = IPV6_MIN_MTU; | |
950 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
951 | } | |
952 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 953 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
954 | } |
955 | } | |
956 | ||
1da177e4 LT |
957 | static int ipv6_get_mtu(struct net_device *dev); |
958 | ||
959 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
960 | { | |
961 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
962 | ||
963 | if (mtu < ip6_rt_min_advmss) | |
964 | mtu = ip6_rt_min_advmss; | |
965 | ||
966 | /* | |
1ab1457c YH |
967 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
968 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
969 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
970 | * rely only on pmtu discovery" |
971 | */ | |
972 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
973 | mtu = IPV6_MAXPLEN; | |
974 | return mtu; | |
975 | } | |
976 | ||
5d0bbeeb | 977 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 978 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 979 | |
1ab1457c | 980 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
1da177e4 LT |
981 | struct neighbour *neigh, |
982 | struct in6_addr *addr, | |
983 | int (*output)(struct sk_buff *)) | |
984 | { | |
985 | struct rt6_info *rt; | |
986 | struct inet6_dev *idev = in6_dev_get(dev); | |
987 | ||
988 | if (unlikely(idev == NULL)) | |
989 | return NULL; | |
990 | ||
991 | rt = ip6_dst_alloc(); | |
992 | if (unlikely(rt == NULL)) { | |
993 | in6_dev_put(idev); | |
994 | goto out; | |
995 | } | |
996 | ||
997 | dev_hold(dev); | |
998 | if (neigh) | |
999 | neigh_hold(neigh); | |
1000 | else | |
1001 | neigh = ndisc_get_neigh(dev, addr); | |
1002 | ||
1003 | rt->rt6i_dev = dev; | |
1004 | rt->rt6i_idev = idev; | |
1005 | rt->rt6i_nexthop = neigh; | |
1006 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1007 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
1008 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1009 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1010 | rt->u.dst.output = output; | |
1011 | ||
1012 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
1013 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1014 | ? DST_HOST | |
1da177e4 LT |
1015 | : 0; |
1016 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1017 | rt->rt6i_dst.plen = 128; | |
1018 | #endif | |
1019 | ||
5d0bbeeb | 1020 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
1021 | rt->u.dst.next = ndisc_dst_gc_list; |
1022 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 1023 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
1024 | |
1025 | fib6_force_start_gc(); | |
1026 | ||
1027 | out: | |
40aa7b90 | 1028 | return &rt->u.dst; |
1da177e4 LT |
1029 | } |
1030 | ||
1031 | int ndisc_dst_gc(int *more) | |
1032 | { | |
1033 | struct dst_entry *dst, *next, **pprev; | |
1034 | int freed; | |
1035 | ||
1036 | next = NULL; | |
1ab1457c | 1037 | freed = 0; |
5d0bbeeb TG |
1038 | |
1039 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 1040 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 1041 | |
1da177e4 LT |
1042 | while ((dst = *pprev) != NULL) { |
1043 | if (!atomic_read(&dst->__refcnt)) { | |
1044 | *pprev = dst->next; | |
1045 | dst_free(dst); | |
1046 | freed++; | |
1047 | } else { | |
1048 | pprev = &dst->next; | |
1049 | (*more)++; | |
1050 | } | |
1051 | } | |
1052 | ||
5d0bbeeb TG |
1053 | spin_unlock_bh(&ndisc_lock); |
1054 | ||
1da177e4 LT |
1055 | return freed; |
1056 | } | |
1057 | ||
1058 | static int ip6_dst_gc(void) | |
1059 | { | |
1060 | static unsigned expire = 30*HZ; | |
1061 | static unsigned long last_gc; | |
1062 | unsigned long now = jiffies; | |
1063 | ||
1064 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
1065 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
1066 | goto out; | |
1067 | ||
1068 | expire++; | |
1069 | fib6_run_gc(expire); | |
1070 | last_gc = now; | |
1071 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
1072 | expire = ip6_rt_gc_timeout>>1; | |
1073 | ||
1074 | out: | |
1075 | expire -= expire>>ip6_rt_gc_elasticity; | |
1076 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
1077 | } | |
1078 | ||
1079 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1080 | but results in cleaner routing tables. | |
1081 | ||
1082 | Remove it only when all the things will work! | |
1083 | */ | |
1084 | ||
1085 | static int ipv6_get_mtu(struct net_device *dev) | |
1086 | { | |
1087 | int mtu = IPV6_MIN_MTU; | |
1088 | struct inet6_dev *idev; | |
1089 | ||
1090 | idev = in6_dev_get(dev); | |
1091 | if (idev) { | |
1092 | mtu = idev->cnf.mtu6; | |
1093 | in6_dev_put(idev); | |
1094 | } | |
1095 | return mtu; | |
1096 | } | |
1097 | ||
1098 | int ipv6_get_hoplimit(struct net_device *dev) | |
1099 | { | |
1100 | int hoplimit = ipv6_devconf.hop_limit; | |
1101 | struct inet6_dev *idev; | |
1102 | ||
1103 | idev = in6_dev_get(dev); | |
1104 | if (idev) { | |
1105 | hoplimit = idev->cnf.hop_limit; | |
1106 | in6_dev_put(idev); | |
1107 | } | |
1108 | return hoplimit; | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * | |
1113 | */ | |
1114 | ||
86872cb5 | 1115 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1116 | { |
1117 | int err; | |
1da177e4 LT |
1118 | struct rt6_info *rt = NULL; |
1119 | struct net_device *dev = NULL; | |
1120 | struct inet6_dev *idev = NULL; | |
c71099ac | 1121 | struct fib6_table *table; |
1da177e4 LT |
1122 | int addr_type; |
1123 | ||
86872cb5 | 1124 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1125 | return -EINVAL; |
1126 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1127 | if (cfg->fc_src_len) |
1da177e4 LT |
1128 | return -EINVAL; |
1129 | #endif | |
86872cb5 | 1130 | if (cfg->fc_ifindex) { |
1da177e4 | 1131 | err = -ENODEV; |
86872cb5 | 1132 | dev = dev_get_by_index(cfg->fc_ifindex); |
1da177e4 LT |
1133 | if (!dev) |
1134 | goto out; | |
1135 | idev = in6_dev_get(dev); | |
1136 | if (!idev) | |
1137 | goto out; | |
1138 | } | |
1139 | ||
86872cb5 TG |
1140 | if (cfg->fc_metric == 0) |
1141 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1142 | |
86872cb5 | 1143 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1144 | if (table == NULL) { |
1145 | err = -ENOBUFS; | |
1146 | goto out; | |
1147 | } | |
1148 | ||
1da177e4 LT |
1149 | rt = ip6_dst_alloc(); |
1150 | ||
1151 | if (rt == NULL) { | |
1152 | err = -ENOMEM; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
1156 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1157 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1158 | |
86872cb5 TG |
1159 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1160 | cfg->fc_protocol = RTPROT_BOOT; | |
1161 | rt->rt6i_protocol = cfg->fc_protocol; | |
1162 | ||
1163 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1164 | |
1165 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1166 | rt->u.dst.input = ip6_mc_input; | |
1167 | else | |
1168 | rt->u.dst.input = ip6_forward; | |
1169 | ||
1170 | rt->u.dst.output = ip6_output; | |
1171 | ||
86872cb5 TG |
1172 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1173 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1174 | if (rt->rt6i_dst.plen == 128) |
1175 | rt->u.dst.flags = DST_HOST; | |
1176 | ||
1177 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1178 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1179 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1180 | #endif |
1181 | ||
86872cb5 | 1182 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1183 | |
1184 | /* We cannot add true routes via loopback here, | |
1185 | they would result in kernel looping; promote them to reject routes | |
1186 | */ | |
86872cb5 | 1187 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1188 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1189 | /* hold loopback dev/idev if we haven't done so. */ | |
1190 | if (dev != &loopback_dev) { | |
1191 | if (dev) { | |
1192 | dev_put(dev); | |
1193 | in6_dev_put(idev); | |
1194 | } | |
1195 | dev = &loopback_dev; | |
1196 | dev_hold(dev); | |
1197 | idev = in6_dev_get(dev); | |
1198 | if (!idev) { | |
1199 | err = -ENODEV; | |
1200 | goto out; | |
1201 | } | |
1202 | } | |
1203 | rt->u.dst.output = ip6_pkt_discard_out; | |
1204 | rt->u.dst.input = ip6_pkt_discard; | |
1205 | rt->u.dst.error = -ENETUNREACH; | |
1206 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1207 | goto install_route; | |
1208 | } | |
1209 | ||
86872cb5 | 1210 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1211 | struct in6_addr *gw_addr; |
1212 | int gwa_type; | |
1213 | ||
86872cb5 TG |
1214 | gw_addr = &cfg->fc_gateway; |
1215 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1216 | gwa_type = ipv6_addr_type(gw_addr); |
1217 | ||
1218 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1219 | struct rt6_info *grt; | |
1220 | ||
1221 | /* IPv6 strictly inhibits using not link-local | |
1222 | addresses as nexthop address. | |
1223 | Otherwise, router will not able to send redirects. | |
1224 | It is very good, but in some (rare!) circumstances | |
1225 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1226 | some exceptions. --ANK | |
1227 | */ | |
1228 | err = -EINVAL; | |
1229 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1230 | goto out; | |
1231 | ||
86872cb5 | 1232 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1233 | |
1234 | err = -EHOSTUNREACH; | |
1235 | if (grt == NULL) | |
1236 | goto out; | |
1237 | if (dev) { | |
1238 | if (dev != grt->rt6i_dev) { | |
1239 | dst_release(&grt->u.dst); | |
1240 | goto out; | |
1241 | } | |
1242 | } else { | |
1243 | dev = grt->rt6i_dev; | |
1244 | idev = grt->rt6i_idev; | |
1245 | dev_hold(dev); | |
1246 | in6_dev_hold(grt->rt6i_idev); | |
1247 | } | |
1248 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1249 | err = 0; | |
1250 | dst_release(&grt->u.dst); | |
1251 | ||
1252 | if (err) | |
1253 | goto out; | |
1254 | } | |
1255 | err = -EINVAL; | |
1256 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1257 | goto out; | |
1258 | } | |
1259 | ||
1260 | err = -ENODEV; | |
1261 | if (dev == NULL) | |
1262 | goto out; | |
1263 | ||
86872cb5 | 1264 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1265 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1266 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1267 | err = PTR_ERR(rt->rt6i_nexthop); | |
1268 | rt->rt6i_nexthop = NULL; | |
1269 | goto out; | |
1270 | } | |
1271 | } | |
1272 | ||
86872cb5 | 1273 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1274 | |
1275 | install_route: | |
86872cb5 TG |
1276 | if (cfg->fc_mx) { |
1277 | struct nlattr *nla; | |
1278 | int remaining; | |
1279 | ||
1280 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1281 | int type = nla->nla_type; | |
1282 | ||
1283 | if (type) { | |
1284 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1285 | err = -EINVAL; |
1286 | goto out; | |
1287 | } | |
86872cb5 TG |
1288 | |
1289 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1290 | } |
1da177e4 LT |
1291 | } |
1292 | } | |
1293 | ||
1294 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1295 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1296 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1297 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1298 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1299 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1300 | rt->u.dst.dev = dev; | |
1301 | rt->rt6i_idev = idev; | |
c71099ac | 1302 | rt->rt6i_table = table; |
86872cb5 | 1303 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1304 | |
1305 | out: | |
1306 | if (dev) | |
1307 | dev_put(dev); | |
1308 | if (idev) | |
1309 | in6_dev_put(idev); | |
1310 | if (rt) | |
40aa7b90 | 1311 | dst_free(&rt->u.dst); |
1da177e4 LT |
1312 | return err; |
1313 | } | |
1314 | ||
86872cb5 | 1315 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1316 | { |
1317 | int err; | |
c71099ac | 1318 | struct fib6_table *table; |
1da177e4 | 1319 | |
6c813a72 PM |
1320 | if (rt == &ip6_null_entry) |
1321 | return -ENOENT; | |
1322 | ||
c71099ac TG |
1323 | table = rt->rt6i_table; |
1324 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1325 | |
86872cb5 | 1326 | err = fib6_del(rt, info); |
1da177e4 LT |
1327 | dst_release(&rt->u.dst); |
1328 | ||
c71099ac | 1329 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1330 | |
1331 | return err; | |
1332 | } | |
1333 | ||
e0a1ad73 TG |
1334 | int ip6_del_rt(struct rt6_info *rt) |
1335 | { | |
86872cb5 | 1336 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1337 | } |
1338 | ||
86872cb5 | 1339 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1340 | { |
c71099ac | 1341 | struct fib6_table *table; |
1da177e4 LT |
1342 | struct fib6_node *fn; |
1343 | struct rt6_info *rt; | |
1344 | int err = -ESRCH; | |
1345 | ||
86872cb5 | 1346 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1347 | if (table == NULL) |
1348 | return err; | |
1349 | ||
1350 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1351 | |
c71099ac | 1352 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1353 | &cfg->fc_dst, cfg->fc_dst_len, |
1354 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1355 | |
1da177e4 | 1356 | if (fn) { |
7cc48263 | 1357 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1358 | if (cfg->fc_ifindex && |
1da177e4 | 1359 | (rt->rt6i_dev == NULL || |
86872cb5 | 1360 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1361 | continue; |
86872cb5 TG |
1362 | if (cfg->fc_flags & RTF_GATEWAY && |
1363 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1364 | continue; |
86872cb5 | 1365 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1366 | continue; |
1367 | dst_hold(&rt->u.dst); | |
c71099ac | 1368 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1369 | |
86872cb5 | 1370 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1371 | } |
1372 | } | |
c71099ac | 1373 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1374 | |
1375 | return err; | |
1376 | } | |
1377 | ||
1378 | /* | |
1379 | * Handle redirects | |
1380 | */ | |
a6279458 YH |
1381 | struct ip6rd_flowi { |
1382 | struct flowi fl; | |
1383 | struct in6_addr gateway; | |
1384 | }; | |
1385 | ||
1386 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1387 | struct flowi *fl, | |
1388 | int flags) | |
1da177e4 | 1389 | { |
a6279458 YH |
1390 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1391 | struct rt6_info *rt; | |
e843b9e1 | 1392 | struct fib6_node *fn; |
c71099ac | 1393 | |
1da177e4 | 1394 | /* |
e843b9e1 YH |
1395 | * Get the "current" route for this destination and |
1396 | * check if the redirect has come from approriate router. | |
1397 | * | |
1398 | * RFC 2461 specifies that redirects should only be | |
1399 | * accepted if they come from the nexthop to the target. | |
1400 | * Due to the way the routes are chosen, this notion | |
1401 | * is a bit fuzzy and one might need to check all possible | |
1402 | * routes. | |
1da177e4 | 1403 | */ |
1da177e4 | 1404 | |
c71099ac | 1405 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1406 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1407 | restart: |
7cc48263 | 1408 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1409 | /* |
1410 | * Current route is on-link; redirect is always invalid. | |
1411 | * | |
1412 | * Seems, previous statement is not true. It could | |
1413 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1414 | * But then router serving it might decide, that we should | |
1415 | * know truth 8)8) --ANK (980726). | |
1416 | */ | |
1417 | if (rt6_check_expired(rt)) | |
1418 | continue; | |
1419 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1420 | continue; | |
a6279458 | 1421 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1422 | continue; |
a6279458 | 1423 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1424 | continue; |
1425 | break; | |
1426 | } | |
a6279458 | 1427 | |
cb15d9c2 | 1428 | if (!rt) |
a6279458 | 1429 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1430 | BACKTRACK(&fl->fl6_src); |
1431 | out: | |
a6279458 YH |
1432 | dst_hold(&rt->u.dst); |
1433 | ||
c71099ac | 1434 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1435 | |
a6279458 YH |
1436 | return rt; |
1437 | }; | |
1438 | ||
1439 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1440 | struct in6_addr *src, | |
1441 | struct in6_addr *gateway, | |
1442 | struct net_device *dev) | |
1443 | { | |
adaa70bb | 1444 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1445 | struct ip6rd_flowi rdfl = { |
1446 | .fl = { | |
1447 | .oif = dev->ifindex, | |
1448 | .nl_u = { | |
1449 | .ip6_u = { | |
1450 | .daddr = *dest, | |
1451 | .saddr = *src, | |
1452 | }, | |
1453 | }, | |
1454 | }, | |
1455 | .gateway = *gateway, | |
1456 | }; | |
adaa70bb TG |
1457 | |
1458 | if (rt6_need_strict(dest)) | |
1459 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1460 | |
1461 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1462 | } | |
1463 | ||
1464 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1465 | struct in6_addr *saddr, | |
1466 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1467 | { | |
1468 | struct rt6_info *rt, *nrt = NULL; | |
1469 | struct netevent_redirect netevent; | |
1470 | ||
1471 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1472 | ||
1473 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1474 | if (net_ratelimit()) |
1475 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1476 | "for redirect target\n"); | |
a6279458 | 1477 | goto out; |
1da177e4 LT |
1478 | } |
1479 | ||
1da177e4 LT |
1480 | /* |
1481 | * We have finally decided to accept it. | |
1482 | */ | |
1483 | ||
1ab1457c | 1484 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1485 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1486 | NEIGH_UPDATE_F_OVERRIDE| | |
1487 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1488 | NEIGH_UPDATE_F_ISROUTER)) | |
1489 | ); | |
1490 | ||
1491 | /* | |
1492 | * Redirect received -> path was valid. | |
1493 | * Look, redirects are sent only in response to data packets, | |
1494 | * so that this nexthop apparently is reachable. --ANK | |
1495 | */ | |
1496 | dst_confirm(&rt->u.dst); | |
1497 | ||
1498 | /* Duplicate redirect: silently ignore. */ | |
1499 | if (neigh == rt->u.dst.neighbour) | |
1500 | goto out; | |
1501 | ||
1502 | nrt = ip6_rt_copy(rt); | |
1503 | if (nrt == NULL) | |
1504 | goto out; | |
1505 | ||
1506 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1507 | if (on_link) | |
1508 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1509 | ||
1510 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1511 | nrt->rt6i_dst.plen = 128; | |
1512 | nrt->u.dst.flags |= DST_HOST; | |
1513 | ||
1514 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1515 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1516 | /* Reset pmtu, it may be better */ | |
1517 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1518 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1519 | ||
40e22e8f | 1520 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1521 | goto out; |
1522 | ||
8d71740c TT |
1523 | netevent.old = &rt->u.dst; |
1524 | netevent.new = &nrt->u.dst; | |
1525 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1526 | ||
1da177e4 | 1527 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1528 | ip6_del_rt(rt); |
1da177e4 LT |
1529 | return; |
1530 | } | |
1531 | ||
1532 | out: | |
1ab1457c | 1533 | dst_release(&rt->u.dst); |
1da177e4 LT |
1534 | return; |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Handle ICMP "packet too big" messages | |
1539 | * i.e. Path MTU discovery | |
1540 | */ | |
1541 | ||
1542 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1543 | struct net_device *dev, u32 pmtu) | |
1544 | { | |
1545 | struct rt6_info *rt, *nrt; | |
1546 | int allfrag = 0; | |
1547 | ||
1548 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1549 | if (rt == NULL) | |
1550 | return; | |
1551 | ||
1552 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1553 | goto out; | |
1554 | ||
1555 | if (pmtu < IPV6_MIN_MTU) { | |
1556 | /* | |
1ab1457c | 1557 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1558 | * MTU (1280) and a fragment header should always be included |
1559 | * after a node receiving Too Big message reporting PMTU is | |
1560 | * less than the IPv6 Minimum Link MTU. | |
1561 | */ | |
1562 | pmtu = IPV6_MIN_MTU; | |
1563 | allfrag = 1; | |
1564 | } | |
1565 | ||
1566 | /* New mtu received -> path was valid. | |
1567 | They are sent only in response to data packets, | |
1568 | so that this nexthop apparently is reachable. --ANK | |
1569 | */ | |
1570 | dst_confirm(&rt->u.dst); | |
1571 | ||
1572 | /* Host route. If it is static, it would be better | |
1573 | not to override it, but add new one, so that | |
1574 | when cache entry will expire old pmtu | |
1575 | would return automatically. | |
1576 | */ | |
1577 | if (rt->rt6i_flags & RTF_CACHE) { | |
1578 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1579 | if (allfrag) | |
1580 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1581 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1582 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | /* Network route. | |
1587 | Two cases are possible: | |
1588 | 1. It is connected route. Action: COW | |
1589 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1590 | */ | |
d5315b50 | 1591 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1592 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1593 | else |
1594 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1595 | |
d5315b50 | 1596 | if (nrt) { |
a1e78363 YH |
1597 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1598 | if (allfrag) | |
1599 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1600 | ||
1601 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1602 | * happened within 5 mins, the recommended timer is 10 mins. | |
1603 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1604 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1605 | * and detecting PMTU increase will be automatically happened. | |
1606 | */ | |
1607 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1608 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1609 | ||
40e22e8f | 1610 | ip6_ins_rt(nrt); |
1da177e4 | 1611 | } |
1da177e4 LT |
1612 | out: |
1613 | dst_release(&rt->u.dst); | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * Misc support functions | |
1618 | */ | |
1619 | ||
1620 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1621 | { | |
1622 | struct rt6_info *rt = ip6_dst_alloc(); | |
1623 | ||
1624 | if (rt) { | |
1625 | rt->u.dst.input = ort->u.dst.input; | |
1626 | rt->u.dst.output = ort->u.dst.output; | |
1627 | ||
1628 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1629 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1630 | rt->u.dst.dev = ort->u.dst.dev; |
1631 | if (rt->u.dst.dev) | |
1632 | dev_hold(rt->u.dst.dev); | |
1633 | rt->rt6i_idev = ort->rt6i_idev; | |
1634 | if (rt->rt6i_idev) | |
1635 | in6_dev_hold(rt->rt6i_idev); | |
1636 | rt->u.dst.lastuse = jiffies; | |
1637 | rt->rt6i_expires = 0; | |
1638 | ||
1639 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1640 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1641 | rt->rt6i_metric = 0; | |
1642 | ||
1643 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1644 | #ifdef CONFIG_IPV6_SUBTREES | |
1645 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1646 | #endif | |
c71099ac | 1647 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1648 | } |
1649 | return rt; | |
1650 | } | |
1651 | ||
70ceb4f5 YH |
1652 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1653 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1654 | struct in6_addr *gwaddr, int ifindex) | |
1655 | { | |
1656 | struct fib6_node *fn; | |
1657 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1658 | struct fib6_table *table; |
1659 | ||
1660 | table = fib6_get_table(RT6_TABLE_INFO); | |
1661 | if (table == NULL) | |
1662 | return NULL; | |
70ceb4f5 | 1663 | |
c71099ac TG |
1664 | write_lock_bh(&table->tb6_lock); |
1665 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1666 | if (!fn) |
1667 | goto out; | |
1668 | ||
7cc48263 | 1669 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1670 | if (rt->rt6i_dev->ifindex != ifindex) |
1671 | continue; | |
1672 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1673 | continue; | |
1674 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1675 | continue; | |
1676 | dst_hold(&rt->u.dst); | |
1677 | break; | |
1678 | } | |
1679 | out: | |
c71099ac | 1680 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1681 | return rt; |
1682 | } | |
1683 | ||
1684 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1685 | struct in6_addr *gwaddr, int ifindex, | |
1686 | unsigned pref) | |
1687 | { | |
86872cb5 TG |
1688 | struct fib6_config cfg = { |
1689 | .fc_table = RT6_TABLE_INFO, | |
1690 | .fc_metric = 1024, | |
1691 | .fc_ifindex = ifindex, | |
1692 | .fc_dst_len = prefixlen, | |
1693 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1694 | RTF_UP | RTF_PREF(pref), | |
1695 | }; | |
1696 | ||
1697 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1698 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1699 | |
e317da96 YH |
1700 | /* We should treat it as a default route if prefix length is 0. */ |
1701 | if (!prefixlen) | |
86872cb5 | 1702 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1703 | |
86872cb5 | 1704 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1705 | |
1706 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1707 | } | |
1708 | #endif | |
1709 | ||
1da177e4 | 1710 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1711 | { |
1da177e4 | 1712 | struct rt6_info *rt; |
c71099ac | 1713 | struct fib6_table *table; |
1da177e4 | 1714 | |
c71099ac TG |
1715 | table = fib6_get_table(RT6_TABLE_DFLT); |
1716 | if (table == NULL) | |
1717 | return NULL; | |
1da177e4 | 1718 | |
c71099ac | 1719 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1720 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1721 | if (dev == rt->rt6i_dev && |
045927ff | 1722 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1723 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1724 | break; | |
1725 | } | |
1726 | if (rt) | |
1727 | dst_hold(&rt->u.dst); | |
c71099ac | 1728 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1729 | return rt; |
1730 | } | |
1731 | ||
1732 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1733 | struct net_device *dev, |
1734 | unsigned int pref) | |
1da177e4 | 1735 | { |
86872cb5 TG |
1736 | struct fib6_config cfg = { |
1737 | .fc_table = RT6_TABLE_DFLT, | |
1738 | .fc_metric = 1024, | |
1739 | .fc_ifindex = dev->ifindex, | |
1740 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1741 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1742 | }; | |
1da177e4 | 1743 | |
86872cb5 | 1744 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1745 | |
86872cb5 | 1746 | ip6_route_add(&cfg); |
1da177e4 | 1747 | |
1da177e4 LT |
1748 | return rt6_get_dflt_router(gwaddr, dev); |
1749 | } | |
1750 | ||
1751 | void rt6_purge_dflt_routers(void) | |
1752 | { | |
1753 | struct rt6_info *rt; | |
c71099ac TG |
1754 | struct fib6_table *table; |
1755 | ||
1756 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1757 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1758 | if (table == NULL) | |
1759 | return; | |
1da177e4 LT |
1760 | |
1761 | restart: | |
c71099ac | 1762 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1763 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1764 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1765 | dst_hold(&rt->u.dst); | |
c71099ac | 1766 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1767 | ip6_del_rt(rt); |
1da177e4 LT |
1768 | goto restart; |
1769 | } | |
1770 | } | |
c71099ac | 1771 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1772 | } |
1773 | ||
86872cb5 TG |
1774 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1775 | struct fib6_config *cfg) | |
1776 | { | |
1777 | memset(cfg, 0, sizeof(*cfg)); | |
1778 | ||
1779 | cfg->fc_table = RT6_TABLE_MAIN; | |
1780 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1781 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1782 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1783 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1784 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1785 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1786 | ||
1787 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1788 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1789 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1790 | } | |
1791 | ||
1da177e4 LT |
1792 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1793 | { | |
86872cb5 | 1794 | struct fib6_config cfg; |
1da177e4 LT |
1795 | struct in6_rtmsg rtmsg; |
1796 | int err; | |
1797 | ||
1798 | switch(cmd) { | |
1799 | case SIOCADDRT: /* Add a route */ | |
1800 | case SIOCDELRT: /* Delete a route */ | |
1801 | if (!capable(CAP_NET_ADMIN)) | |
1802 | return -EPERM; | |
1803 | err = copy_from_user(&rtmsg, arg, | |
1804 | sizeof(struct in6_rtmsg)); | |
1805 | if (err) | |
1806 | return -EFAULT; | |
86872cb5 TG |
1807 | |
1808 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1809 | ||
1da177e4 LT |
1810 | rtnl_lock(); |
1811 | switch (cmd) { | |
1812 | case SIOCADDRT: | |
86872cb5 | 1813 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1814 | break; |
1815 | case SIOCDELRT: | |
86872cb5 | 1816 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1817 | break; |
1818 | default: | |
1819 | err = -EINVAL; | |
1820 | } | |
1821 | rtnl_unlock(); | |
1822 | ||
1823 | return err; | |
3ff50b79 | 1824 | } |
1da177e4 LT |
1825 | |
1826 | return -EINVAL; | |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * Drop the packet on the floor | |
1831 | */ | |
1832 | ||
612f09e8 YH |
1833 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, |
1834 | int ipstats_mib_noroutes) | |
1da177e4 | 1835 | { |
612f09e8 YH |
1836 | int type; |
1837 | switch (ipstats_mib_noroutes) { | |
1838 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1839 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1840 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1841 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1842 | break; | |
1843 | } | |
1844 | /* FALLTHROUGH */ | |
1845 | case IPSTATS_MIB_OUTNOROUTES: | |
1846 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1847 | break; | |
1848 | } | |
9ce8ade0 | 1849 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1850 | kfree_skb(skb); |
1851 | return 0; | |
1852 | } | |
1853 | ||
9ce8ade0 TG |
1854 | static int ip6_pkt_discard(struct sk_buff *skb) |
1855 | { | |
612f09e8 | 1856 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1857 | } |
1858 | ||
20380731 | 1859 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1860 | { |
1861 | skb->dev = skb->dst->dev; | |
612f09e8 | 1862 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1863 | } |
1864 | ||
6723ab54 DM |
1865 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1866 | ||
9ce8ade0 TG |
1867 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1868 | { | |
612f09e8 | 1869 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1870 | } |
1871 | ||
1872 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1873 | { | |
1874 | skb->dev = skb->dst->dev; | |
612f09e8 | 1875 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1876 | } |
1877 | ||
1878 | static int ip6_pkt_blk_hole(struct sk_buff *skb) | |
1879 | { | |
1880 | kfree_skb(skb); | |
1881 | return 0; | |
1882 | } | |
1883 | ||
6723ab54 DM |
1884 | #endif |
1885 | ||
1da177e4 LT |
1886 | /* |
1887 | * Allocate a dst for local (unicast / anycast) address. | |
1888 | */ | |
1889 | ||
1890 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1891 | const struct in6_addr *addr, | |
1892 | int anycast) | |
1893 | { | |
1894 | struct rt6_info *rt = ip6_dst_alloc(); | |
1895 | ||
1896 | if (rt == NULL) | |
1897 | return ERR_PTR(-ENOMEM); | |
1898 | ||
1899 | dev_hold(&loopback_dev); | |
1900 | in6_dev_hold(idev); | |
1901 | ||
1902 | rt->u.dst.flags = DST_HOST; | |
1903 | rt->u.dst.input = ip6_input; | |
1904 | rt->u.dst.output = ip6_output; | |
1905 | rt->rt6i_dev = &loopback_dev; | |
1906 | rt->rt6i_idev = idev; | |
1907 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1908 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1909 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1910 | rt->u.dst.obsolete = -1; | |
1911 | ||
1912 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1913 | if (anycast) |
1914 | rt->rt6i_flags |= RTF_ANYCAST; | |
1915 | else | |
1da177e4 LT |
1916 | rt->rt6i_flags |= RTF_LOCAL; |
1917 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1918 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1919 | dst_free(&rt->u.dst); |
1da177e4 LT |
1920 | return ERR_PTR(-ENOMEM); |
1921 | } | |
1922 | ||
1923 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1924 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1925 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1926 | |
1927 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1928 | ||
1929 | return rt; | |
1930 | } | |
1931 | ||
1932 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1933 | { | |
1934 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1935 | rt != &ip6_null_entry) { | |
1936 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1937 | return -1; | |
1938 | } | |
1939 | return 0; | |
1940 | } | |
1941 | ||
1942 | void rt6_ifdown(struct net_device *dev) | |
1943 | { | |
c71099ac | 1944 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1945 | } |
1946 | ||
1947 | struct rt6_mtu_change_arg | |
1948 | { | |
1949 | struct net_device *dev; | |
1950 | unsigned mtu; | |
1951 | }; | |
1952 | ||
1953 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1954 | { | |
1955 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1956 | struct inet6_dev *idev; | |
1957 | ||
1958 | /* In IPv6 pmtu discovery is not optional, | |
1959 | so that RTAX_MTU lock cannot disable it. | |
1960 | We still use this lock to block changes | |
1961 | caused by addrconf/ndisc. | |
1962 | */ | |
1963 | ||
1964 | idev = __in6_dev_get(arg->dev); | |
1965 | if (idev == NULL) | |
1966 | return 0; | |
1967 | ||
1968 | /* For administrative MTU increase, there is no way to discover | |
1969 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1970 | Since RFC 1981 doesn't include administrative MTU increase | |
1971 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1972 | */ | |
1973 | /* | |
1974 | If new MTU is less than route PMTU, this new MTU will be the | |
1975 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1976 | decreases; if new MTU is greater than route PMTU, and the | |
1977 | old MTU is the lowest MTU in the path, update the route PMTU | |
1978 | to reflect the increase. In this case if the other nodes' MTU | |
1979 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1980 | PMTU discouvery. | |
1981 | */ | |
1982 | if (rt->rt6i_dev == arg->dev && | |
1983 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1ab1457c YH |
1984 | (dst_mtu(&rt->u.dst) > arg->mtu || |
1985 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1da177e4 LT |
1986 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) |
1987 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1988 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1993 | { | |
c71099ac TG |
1994 | struct rt6_mtu_change_arg arg = { |
1995 | .dev = dev, | |
1996 | .mtu = mtu, | |
1997 | }; | |
1da177e4 | 1998 | |
c71099ac | 1999 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2000 | } |
2001 | ||
ef7c79ed | 2002 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2003 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2004 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2005 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2006 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2007 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2008 | }; | |
2009 | ||
2010 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2011 | struct fib6_config *cfg) | |
1da177e4 | 2012 | { |
86872cb5 TG |
2013 | struct rtmsg *rtm; |
2014 | struct nlattr *tb[RTA_MAX+1]; | |
2015 | int err; | |
1da177e4 | 2016 | |
86872cb5 TG |
2017 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2018 | if (err < 0) | |
2019 | goto errout; | |
1da177e4 | 2020 | |
86872cb5 TG |
2021 | err = -EINVAL; |
2022 | rtm = nlmsg_data(nlh); | |
2023 | memset(cfg, 0, sizeof(*cfg)); | |
2024 | ||
2025 | cfg->fc_table = rtm->rtm_table; | |
2026 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2027 | cfg->fc_src_len = rtm->rtm_src_len; | |
2028 | cfg->fc_flags = RTF_UP; | |
2029 | cfg->fc_protocol = rtm->rtm_protocol; | |
2030 | ||
2031 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2032 | cfg->fc_flags |= RTF_REJECT; | |
2033 | ||
2034 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2035 | cfg->fc_nlinfo.nlh = nlh; | |
2036 | ||
2037 | if (tb[RTA_GATEWAY]) { | |
2038 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2039 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2040 | } |
86872cb5 TG |
2041 | |
2042 | if (tb[RTA_DST]) { | |
2043 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2044 | ||
2045 | if (nla_len(tb[RTA_DST]) < plen) | |
2046 | goto errout; | |
2047 | ||
2048 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2049 | } |
86872cb5 TG |
2050 | |
2051 | if (tb[RTA_SRC]) { | |
2052 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2053 | ||
2054 | if (nla_len(tb[RTA_SRC]) < plen) | |
2055 | goto errout; | |
2056 | ||
2057 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2058 | } |
86872cb5 TG |
2059 | |
2060 | if (tb[RTA_OIF]) | |
2061 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2062 | ||
2063 | if (tb[RTA_PRIORITY]) | |
2064 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2065 | ||
2066 | if (tb[RTA_METRICS]) { | |
2067 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2068 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2069 | } |
86872cb5 TG |
2070 | |
2071 | if (tb[RTA_TABLE]) | |
2072 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2073 | ||
2074 | err = 0; | |
2075 | errout: | |
2076 | return err; | |
1da177e4 LT |
2077 | } |
2078 | ||
c127ea2c | 2079 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2080 | { |
86872cb5 TG |
2081 | struct fib6_config cfg; |
2082 | int err; | |
1da177e4 | 2083 | |
86872cb5 TG |
2084 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2085 | if (err < 0) | |
2086 | return err; | |
2087 | ||
2088 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2089 | } |
2090 | ||
c127ea2c | 2091 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2092 | { |
86872cb5 TG |
2093 | struct fib6_config cfg; |
2094 | int err; | |
1da177e4 | 2095 | |
86872cb5 TG |
2096 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2097 | if (err < 0) | |
2098 | return err; | |
2099 | ||
2100 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2101 | } |
2102 | ||
339bf98f TG |
2103 | static inline size_t rt6_nlmsg_size(void) |
2104 | { | |
2105 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2106 | + nla_total_size(16) /* RTA_SRC */ | |
2107 | + nla_total_size(16) /* RTA_DST */ | |
2108 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2109 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2110 | + nla_total_size(4) /* RTA_TABLE */ | |
2111 | + nla_total_size(4) /* RTA_IIF */ | |
2112 | + nla_total_size(4) /* RTA_OIF */ | |
2113 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2114 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2115 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2116 | } | |
2117 | ||
1da177e4 | 2118 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2119 | struct in6_addr *dst, struct in6_addr *src, |
2120 | int iif, int type, u32 pid, u32 seq, | |
2121 | int prefix, unsigned int flags) | |
1da177e4 LT |
2122 | { |
2123 | struct rtmsg *rtm; | |
2d7202bf | 2124 | struct nlmsghdr *nlh; |
e3703b3d | 2125 | long expires; |
9e762a4a | 2126 | u32 table; |
1da177e4 LT |
2127 | |
2128 | if (prefix) { /* user wants prefix routes only */ | |
2129 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2130 | /* success since this is not a prefix route */ | |
2131 | return 1; | |
2132 | } | |
2133 | } | |
2134 | ||
2d7202bf TG |
2135 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2136 | if (nlh == NULL) | |
26932566 | 2137 | return -EMSGSIZE; |
2d7202bf TG |
2138 | |
2139 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2140 | rtm->rtm_family = AF_INET6; |
2141 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2142 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2143 | rtm->rtm_tos = 0; | |
c71099ac | 2144 | if (rt->rt6i_table) |
9e762a4a | 2145 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2146 | else |
9e762a4a PM |
2147 | table = RT6_TABLE_UNSPEC; |
2148 | rtm->rtm_table = table; | |
2d7202bf | 2149 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2150 | if (rt->rt6i_flags&RTF_REJECT) |
2151 | rtm->rtm_type = RTN_UNREACHABLE; | |
2152 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2153 | rtm->rtm_type = RTN_LOCAL; | |
2154 | else | |
2155 | rtm->rtm_type = RTN_UNICAST; | |
2156 | rtm->rtm_flags = 0; | |
2157 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2158 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2159 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2160 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2161 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2162 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2163 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2164 | rtm->rtm_protocol = RTPROT_RA; | |
2165 | ||
2166 | if (rt->rt6i_flags&RTF_CACHE) | |
2167 | rtm->rtm_flags |= RTM_F_CLONED; | |
2168 | ||
2169 | if (dst) { | |
2d7202bf | 2170 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2171 | rtm->rtm_dst_len = 128; |
1da177e4 | 2172 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2173 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2174 | #ifdef CONFIG_IPV6_SUBTREES |
2175 | if (src) { | |
2d7202bf | 2176 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2177 | rtm->rtm_src_len = 128; |
1da177e4 | 2178 | } else if (rtm->rtm_src_len) |
2d7202bf | 2179 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2180 | #endif |
2181 | if (iif) | |
2d7202bf | 2182 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2183 | else if (dst) { |
2184 | struct in6_addr saddr_buf; | |
2185 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2186 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2187 | } |
2d7202bf | 2188 | |
1da177e4 | 2189 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2190 | goto nla_put_failure; |
2191 | ||
1da177e4 | 2192 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2193 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2194 | ||
1da177e4 | 2195 | if (rt->u.dst.dev) |
2d7202bf TG |
2196 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2197 | ||
2198 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2199 | |
2200 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2201 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2202 | expires, rt->u.dst.error) < 0) | |
2203 | goto nla_put_failure; | |
2d7202bf TG |
2204 | |
2205 | return nlmsg_end(skb, nlh); | |
2206 | ||
2207 | nla_put_failure: | |
26932566 PM |
2208 | nlmsg_cancel(skb, nlh); |
2209 | return -EMSGSIZE; | |
1da177e4 LT |
2210 | } |
2211 | ||
1b43af54 | 2212 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2213 | { |
2214 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2215 | int prefix; | |
2216 | ||
2d7202bf TG |
2217 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2218 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2219 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2220 | } else | |
2221 | prefix = 0; | |
2222 | ||
2223 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2224 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2225 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2226 | } |
2227 | ||
c127ea2c | 2228 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2229 | { |
ab364a6f TG |
2230 | struct nlattr *tb[RTA_MAX+1]; |
2231 | struct rt6_info *rt; | |
1da177e4 | 2232 | struct sk_buff *skb; |
ab364a6f | 2233 | struct rtmsg *rtm; |
1da177e4 | 2234 | struct flowi fl; |
ab364a6f | 2235 | int err, iif = 0; |
1da177e4 | 2236 | |
ab364a6f TG |
2237 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2238 | if (err < 0) | |
2239 | goto errout; | |
1da177e4 | 2240 | |
ab364a6f | 2241 | err = -EINVAL; |
1da177e4 | 2242 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2243 | |
ab364a6f TG |
2244 | if (tb[RTA_SRC]) { |
2245 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2246 | goto errout; | |
2247 | ||
2248 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2249 | } | |
2250 | ||
2251 | if (tb[RTA_DST]) { | |
2252 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2253 | goto errout; | |
2254 | ||
2255 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2256 | } | |
2257 | ||
2258 | if (tb[RTA_IIF]) | |
2259 | iif = nla_get_u32(tb[RTA_IIF]); | |
2260 | ||
2261 | if (tb[RTA_OIF]) | |
2262 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2263 | |
2264 | if (iif) { | |
2265 | struct net_device *dev; | |
2266 | dev = __dev_get_by_index(iif); | |
2267 | if (!dev) { | |
2268 | err = -ENODEV; | |
ab364a6f | 2269 | goto errout; |
1da177e4 LT |
2270 | } |
2271 | } | |
2272 | ||
ab364a6f TG |
2273 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2274 | if (skb == NULL) { | |
2275 | err = -ENOBUFS; | |
2276 | goto errout; | |
2277 | } | |
1da177e4 | 2278 | |
ab364a6f TG |
2279 | /* Reserve room for dummy headers, this skb can pass |
2280 | through good chunk of routing engine. | |
2281 | */ | |
459a98ed | 2282 | skb_reset_mac_header(skb); |
ab364a6f | 2283 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2284 | |
ab364a6f | 2285 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2286 | skb->dst = &rt->u.dst; |
2287 | ||
ab364a6f | 2288 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2289 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2290 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2291 | if (err < 0) { |
ab364a6f TG |
2292 | kfree_skb(skb); |
2293 | goto errout; | |
1da177e4 LT |
2294 | } |
2295 | ||
2942e900 | 2296 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
ab364a6f | 2297 | errout: |
1da177e4 | 2298 | return err; |
1da177e4 LT |
2299 | } |
2300 | ||
86872cb5 | 2301 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2302 | { |
2303 | struct sk_buff *skb; | |
86872cb5 TG |
2304 | u32 pid = 0, seq = 0; |
2305 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2306 | int err = -ENOBUFS; |
2307 | ||
86872cb5 TG |
2308 | if (info) { |
2309 | pid = info->pid; | |
2310 | nlh = info->nlh; | |
2311 | if (nlh) | |
2312 | seq = nlh->nlmsg_seq; | |
2313 | } | |
2314 | ||
339bf98f | 2315 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2316 | if (skb == NULL) |
2317 | goto errout; | |
2318 | ||
2319 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
26932566 PM |
2320 | if (err < 0) { |
2321 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2322 | WARN_ON(err == -EMSGSIZE); | |
2323 | kfree_skb(skb); | |
2324 | goto errout; | |
2325 | } | |
21713ebc TG |
2326 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); |
2327 | errout: | |
2328 | if (err < 0) | |
2329 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); | |
1da177e4 LT |
2330 | } |
2331 | ||
2332 | /* | |
2333 | * /proc | |
2334 | */ | |
2335 | ||
2336 | #ifdef CONFIG_PROC_FS | |
2337 | ||
2338 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2339 | ||
2340 | struct rt6_proc_arg | |
2341 | { | |
2342 | char *buffer; | |
2343 | int offset; | |
2344 | int length; | |
2345 | int skip; | |
2346 | int len; | |
2347 | }; | |
2348 | ||
2349 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2350 | { | |
2351 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
1da177e4 LT |
2352 | |
2353 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2354 | arg->skip++; | |
2355 | return 0; | |
2356 | } | |
2357 | ||
2358 | if (arg->len >= arg->length) | |
2359 | return 0; | |
2360 | ||
33e93c96 YH |
2361 | arg->len += sprintf(arg->buffer + arg->len, |
2362 | NIP6_SEQFMT " %02x ", | |
2363 | NIP6(rt->rt6i_dst.addr), | |
1da177e4 LT |
2364 | rt->rt6i_dst.plen); |
2365 | ||
2366 | #ifdef CONFIG_IPV6_SUBTREES | |
33e93c96 YH |
2367 | arg->len += sprintf(arg->buffer + arg->len, |
2368 | NIP6_SEQFMT " %02x ", | |
2369 | NIP6(rt->rt6i_src.addr), | |
1da177e4 LT |
2370 | rt->rt6i_src.plen); |
2371 | #else | |
33e93c96 YH |
2372 | arg->len += sprintf(arg->buffer + arg->len, |
2373 | "00000000000000000000000000000000 00 "); | |
1da177e4 LT |
2374 | #endif |
2375 | ||
2376 | if (rt->rt6i_nexthop) { | |
33e93c96 YH |
2377 | arg->len += sprintf(arg->buffer + arg->len, |
2378 | NIP6_SEQFMT, | |
2379 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2380 | } else { |
33e93c96 YH |
2381 | arg->len += sprintf(arg->buffer + arg->len, |
2382 | "00000000000000000000000000000000"); | |
1da177e4 LT |
2383 | } |
2384 | arg->len += sprintf(arg->buffer + arg->len, | |
2385 | " %08x %08x %08x %08x %8s\n", | |
2386 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
1ab1457c | 2387 | rt->u.dst.__use, rt->rt6i_flags, |
1da177e4 LT |
2388 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
2389 | return 0; | |
2390 | } | |
2391 | ||
2392 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2393 | { | |
c71099ac TG |
2394 | struct rt6_proc_arg arg = { |
2395 | .buffer = buffer, | |
2396 | .offset = offset, | |
2397 | .length = length, | |
2398 | }; | |
1da177e4 | 2399 | |
c71099ac | 2400 | fib6_clean_all(rt6_info_route, 0, &arg); |
1da177e4 LT |
2401 | |
2402 | *start = buffer; | |
2403 | if (offset) | |
2404 | *start += offset % RT6_INFO_LEN; | |
2405 | ||
2406 | arg.len -= offset % RT6_INFO_LEN; | |
2407 | ||
2408 | if (arg.len > length) | |
2409 | arg.len = length; | |
2410 | if (arg.len < 0) | |
2411 | arg.len = 0; | |
2412 | ||
2413 | return arg.len; | |
2414 | } | |
2415 | ||
1da177e4 LT |
2416 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2417 | { | |
2418 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2419 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2420 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2421 | rt6_stats.fib_rt_cache, | |
2422 | atomic_read(&ip6_dst_ops.entries), | |
2423 | rt6_stats.fib_discarded_routes); | |
2424 | ||
2425 | return 0; | |
2426 | } | |
2427 | ||
2428 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2429 | { | |
2430 | return single_open(file, rt6_stats_seq_show, NULL); | |
2431 | } | |
2432 | ||
9a32144e | 2433 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2434 | .owner = THIS_MODULE, |
2435 | .open = rt6_stats_seq_open, | |
2436 | .read = seq_read, | |
2437 | .llseek = seq_lseek, | |
2438 | .release = single_release, | |
2439 | }; | |
2440 | #endif /* CONFIG_PROC_FS */ | |
2441 | ||
2442 | #ifdef CONFIG_SYSCTL | |
2443 | ||
2444 | static int flush_delay; | |
2445 | ||
2446 | static | |
2447 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2448 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2449 | { | |
2450 | if (write) { | |
2451 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2452 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2453 | return 0; | |
2454 | } else | |
2455 | return -EINVAL; | |
2456 | } | |
2457 | ||
2458 | ctl_table ipv6_route_table[] = { | |
1ab1457c YH |
2459 | { |
2460 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
1da177e4 | 2461 | .procname = "flush", |
1ab1457c | 2462 | .data = &flush_delay, |
1da177e4 | 2463 | .maxlen = sizeof(int), |
89c8b3a1 | 2464 | .mode = 0200, |
1ab1457c | 2465 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2466 | }, |
2467 | { | |
2468 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2469 | .procname = "gc_thresh", | |
1ab1457c | 2470 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2471 | .maxlen = sizeof(int), |
2472 | .mode = 0644, | |
1ab1457c | 2473 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2474 | }, |
2475 | { | |
2476 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2477 | .procname = "max_size", | |
1ab1457c | 2478 | .data = &ip6_rt_max_size, |
1da177e4 LT |
2479 | .maxlen = sizeof(int), |
2480 | .mode = 0644, | |
1ab1457c | 2481 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2482 | }, |
2483 | { | |
2484 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2485 | .procname = "gc_min_interval", | |
1ab1457c | 2486 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2487 | .maxlen = sizeof(int), |
2488 | .mode = 0644, | |
1ab1457c | 2489 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2490 | .strategy = &sysctl_jiffies, |
2491 | }, | |
2492 | { | |
2493 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2494 | .procname = "gc_timeout", | |
1ab1457c | 2495 | .data = &ip6_rt_gc_timeout, |
1da177e4 LT |
2496 | .maxlen = sizeof(int), |
2497 | .mode = 0644, | |
1ab1457c | 2498 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2499 | .strategy = &sysctl_jiffies, |
2500 | }, | |
2501 | { | |
2502 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2503 | .procname = "gc_interval", | |
1ab1457c | 2504 | .data = &ip6_rt_gc_interval, |
1da177e4 LT |
2505 | .maxlen = sizeof(int), |
2506 | .mode = 0644, | |
1ab1457c | 2507 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2508 | .strategy = &sysctl_jiffies, |
2509 | }, | |
2510 | { | |
2511 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2512 | .procname = "gc_elasticity", | |
1ab1457c | 2513 | .data = &ip6_rt_gc_elasticity, |
1da177e4 LT |
2514 | .maxlen = sizeof(int), |
2515 | .mode = 0644, | |
1ab1457c | 2516 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2517 | .strategy = &sysctl_jiffies, |
2518 | }, | |
2519 | { | |
2520 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2521 | .procname = "mtu_expires", | |
1ab1457c | 2522 | .data = &ip6_rt_mtu_expires, |
1da177e4 LT |
2523 | .maxlen = sizeof(int), |
2524 | .mode = 0644, | |
1ab1457c | 2525 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2526 | .strategy = &sysctl_jiffies, |
2527 | }, | |
2528 | { | |
2529 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2530 | .procname = "min_adv_mss", | |
1ab1457c | 2531 | .data = &ip6_rt_min_advmss, |
1da177e4 LT |
2532 | .maxlen = sizeof(int), |
2533 | .mode = 0644, | |
1ab1457c | 2534 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2535 | .strategy = &sysctl_jiffies, |
2536 | }, | |
2537 | { | |
2538 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2539 | .procname = "gc_min_interval_ms", | |
1ab1457c | 2540 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2541 | .maxlen = sizeof(int), |
2542 | .mode = 0644, | |
1ab1457c | 2543 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2544 | .strategy = &sysctl_ms_jiffies, |
2545 | }, | |
2546 | { .ctl_name = 0 } | |
2547 | }; | |
2548 | ||
2549 | #endif | |
2550 | ||
2551 | void __init ip6_route_init(void) | |
2552 | { | |
952a10be | 2553 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2554 | struct proc_dir_entry *p; |
952a10be | 2555 | #endif |
e5d679f3 AD |
2556 | ip6_dst_ops.kmem_cachep = |
2557 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
2558 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); | |
14e50e57 DM |
2559 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2560 | ||
1da177e4 LT |
2561 | fib6_init(); |
2562 | #ifdef CONFIG_PROC_FS | |
2563 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2564 | if (p) | |
2565 | p->owner = THIS_MODULE; | |
2566 | ||
2567 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2568 | #endif | |
2569 | #ifdef CONFIG_XFRM | |
2570 | xfrm6_init(); | |
2571 | #endif | |
101367c2 TG |
2572 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2573 | fib6_rules_init(); | |
2574 | #endif | |
c127ea2c TG |
2575 | |
2576 | __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL); | |
2577 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL); | |
2578 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL); | |
1da177e4 LT |
2579 | } |
2580 | ||
2581 | void ip6_route_cleanup(void) | |
2582 | { | |
101367c2 TG |
2583 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2584 | fib6_rules_cleanup(); | |
2585 | #endif | |
1da177e4 LT |
2586 | #ifdef CONFIG_PROC_FS |
2587 | proc_net_remove("ipv6_route"); | |
2588 | proc_net_remove("rt6_stats"); | |
2589 | #endif | |
2590 | #ifdef CONFIG_XFRM | |
2591 | xfrm6_fini(); | |
2592 | #endif | |
2593 | rt6_ifdown(NULL); | |
2594 | fib6_gc_cleanup(); | |
2595 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2596 | } |