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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 | 40 | #include <linux/if_arp.h> |
1da177e4 LT |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> | |
457c4cbc | 43 | #include <net/net_namespace.h> |
1da177e4 LT |
44 | #include <net/snmp.h> |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_fib.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/tcp.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/xfrm.h> | |
8d71740c | 54 | #include <net/netevent.h> |
21713ebc | 55 | #include <net/netlink.h> |
1da177e4 LT |
56 | |
57 | #include <asm/uaccess.h> | |
58 | ||
59 | #ifdef CONFIG_SYSCTL | |
60 | #include <linux/sysctl.h> | |
61 | #endif | |
62 | ||
63 | /* Set to 3 to get tracing. */ | |
64 | #define RT6_DEBUG 2 | |
65 | ||
66 | #if RT6_DEBUG >= 3 | |
67 | #define RDBG(x) printk x | |
68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
69 | #else | |
70 | #define RDBG(x) | |
71 | #define RT6_TRACE(x...) do { ; } while (0) | |
72 | #endif | |
73 | ||
519fbd87 | 74 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 75 | |
1da177e4 LT |
76 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
78 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
79 | static void ip6_dst_destroy(struct dst_entry *); | |
80 | static void ip6_dst_ifdown(struct dst_entry *, | |
81 | struct net_device *dev, int how); | |
82 | static int ip6_dst_gc(void); | |
83 | ||
84 | static int ip6_pkt_discard(struct sk_buff *skb); | |
85 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
86 | static void ip6_link_failure(struct sk_buff *skb); | |
87 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
88 | ||
70ceb4f5 YH |
89 | #ifdef CONFIG_IPV6_ROUTE_INFO |
90 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
91 | struct in6_addr *gwaddr, int ifindex, | |
92 | unsigned pref); | |
93 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
94 | struct in6_addr *gwaddr, int ifindex); | |
95 | #endif | |
96 | ||
1da177e4 LT |
97 | static struct dst_ops ip6_dst_ops = { |
98 | .family = AF_INET6, | |
99 | .protocol = __constant_htons(ETH_P_IPV6), | |
100 | .gc = ip6_dst_gc, | |
101 | .gc_thresh = 1024, | |
102 | .check = ip6_dst_check, | |
103 | .destroy = ip6_dst_destroy, | |
104 | .ifdown = ip6_dst_ifdown, | |
105 | .negative_advice = ip6_negative_advice, | |
106 | .link_failure = ip6_link_failure, | |
107 | .update_pmtu = ip6_rt_update_pmtu, | |
862b82c6 | 108 | .local_out = ip6_local_out, |
1da177e4 LT |
109 | .entry_size = sizeof(struct rt6_info), |
110 | }; | |
111 | ||
14e50e57 DM |
112 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
113 | { | |
114 | } | |
115 | ||
116 | static struct dst_ops ip6_dst_blackhole_ops = { | |
117 | .family = AF_INET6, | |
118 | .protocol = __constant_htons(ETH_P_IPV6), | |
119 | .destroy = ip6_dst_destroy, | |
120 | .check = ip6_dst_check, | |
121 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
122 | .entry_size = sizeof(struct rt6_info), | |
123 | }; | |
124 | ||
1da177e4 LT |
125 | struct rt6_info ip6_null_entry = { |
126 | .u = { | |
127 | .dst = { | |
128 | .__refcnt = ATOMIC_INIT(1), | |
129 | .__use = 1, | |
1da177e4 LT |
130 | .obsolete = -1, |
131 | .error = -ENETUNREACH, | |
132 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
133 | .input = ip6_pkt_discard, | |
134 | .output = ip6_pkt_discard_out, | |
135 | .ops = &ip6_dst_ops, | |
136 | .path = (struct dst_entry*)&ip6_null_entry, | |
137 | } | |
138 | }, | |
139 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
140 | .rt6i_metric = ~(u32) 0, | |
141 | .rt6i_ref = ATOMIC_INIT(1), | |
142 | }; | |
143 | ||
101367c2 TG |
144 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
145 | ||
6723ab54 DM |
146 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
147 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 148 | |
101367c2 TG |
149 | struct rt6_info ip6_prohibit_entry = { |
150 | .u = { | |
151 | .dst = { | |
152 | .__refcnt = ATOMIC_INIT(1), | |
153 | .__use = 1, | |
101367c2 TG |
154 | .obsolete = -1, |
155 | .error = -EACCES, | |
156 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
157 | .input = ip6_pkt_prohibit, |
158 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
159 | .ops = &ip6_dst_ops, |
160 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
161 | } | |
162 | }, | |
163 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
164 | .rt6i_metric = ~(u32) 0, | |
165 | .rt6i_ref = ATOMIC_INIT(1), | |
166 | }; | |
167 | ||
168 | struct rt6_info ip6_blk_hole_entry = { | |
169 | .u = { | |
170 | .dst = { | |
171 | .__refcnt = ATOMIC_INIT(1), | |
172 | .__use = 1, | |
101367c2 TG |
173 | .obsolete = -1, |
174 | .error = -EINVAL, | |
175 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
176 | .input = dst_discard, |
177 | .output = dst_discard, | |
101367c2 TG |
178 | .ops = &ip6_dst_ops, |
179 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
180 | } | |
181 | }, | |
182 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
183 | .rt6i_metric = ~(u32) 0, | |
184 | .rt6i_ref = ATOMIC_INIT(1), | |
185 | }; | |
186 | ||
187 | #endif | |
188 | ||
1da177e4 LT |
189 | /* allocate dst with ip6_dst_ops */ |
190 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
191 | { | |
192 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
193 | } | |
194 | ||
195 | static void ip6_dst_destroy(struct dst_entry *dst) | |
196 | { | |
197 | struct rt6_info *rt = (struct rt6_info *)dst; | |
198 | struct inet6_dev *idev = rt->rt6i_idev; | |
199 | ||
200 | if (idev != NULL) { | |
201 | rt->rt6i_idev = NULL; | |
202 | in6_dev_put(idev); | |
1ab1457c | 203 | } |
1da177e4 LT |
204 | } |
205 | ||
206 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
207 | int how) | |
208 | { | |
209 | struct rt6_info *rt = (struct rt6_info *)dst; | |
210 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
211 | struct net_device *loopback_dev = |
212 | dev->nd_net->loopback_dev; | |
1da177e4 | 213 | |
5a3e55d6 DL |
214 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
215 | struct inet6_dev *loopback_idev = | |
216 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
217 | if (loopback_idev != NULL) { |
218 | rt->rt6i_idev = loopback_idev; | |
219 | in6_dev_put(idev); | |
220 | } | |
221 | } | |
222 | } | |
223 | ||
224 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
225 | { | |
226 | return (rt->rt6i_flags & RTF_EXPIRES && | |
227 | time_after(jiffies, rt->rt6i_expires)); | |
228 | } | |
229 | ||
c71099ac TG |
230 | static inline int rt6_need_strict(struct in6_addr *daddr) |
231 | { | |
232 | return (ipv6_addr_type(daddr) & | |
233 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
234 | } | |
235 | ||
1da177e4 | 236 | /* |
c71099ac | 237 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
238 | */ |
239 | ||
240 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
241 | int oif, | |
242 | int strict) | |
243 | { | |
244 | struct rt6_info *local = NULL; | |
245 | struct rt6_info *sprt; | |
246 | ||
247 | if (oif) { | |
7cc48263 | 248 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
249 | struct net_device *dev = sprt->rt6i_dev; |
250 | if (dev->ifindex == oif) | |
251 | return sprt; | |
252 | if (dev->flags & IFF_LOOPBACK) { | |
253 | if (sprt->rt6i_idev == NULL || | |
254 | sprt->rt6i_idev->dev->ifindex != oif) { | |
255 | if (strict && oif) | |
256 | continue; | |
1ab1457c | 257 | if (local && (!oif || |
1da177e4 LT |
258 | local->rt6i_idev->dev->ifindex == oif)) |
259 | continue; | |
260 | } | |
261 | local = sprt; | |
262 | } | |
263 | } | |
264 | ||
265 | if (local) | |
266 | return local; | |
267 | ||
268 | if (strict) | |
269 | return &ip6_null_entry; | |
270 | } | |
271 | return rt; | |
272 | } | |
273 | ||
27097255 YH |
274 | #ifdef CONFIG_IPV6_ROUTER_PREF |
275 | static void rt6_probe(struct rt6_info *rt) | |
276 | { | |
277 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
278 | /* | |
279 | * Okay, this does not seem to be appropriate | |
280 | * for now, however, we need to check if it | |
281 | * is really so; aka Router Reachability Probing. | |
282 | * | |
283 | * Router Reachability Probe MUST be rate-limited | |
284 | * to no more than one per minute. | |
285 | */ | |
286 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
287 | return; | |
288 | read_lock_bh(&neigh->lock); | |
289 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 290 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
291 | struct in6_addr mcaddr; |
292 | struct in6_addr *target; | |
293 | ||
294 | neigh->updated = jiffies; | |
295 | read_unlock_bh(&neigh->lock); | |
296 | ||
297 | target = (struct in6_addr *)&neigh->primary_key; | |
298 | addrconf_addr_solict_mult(target, &mcaddr); | |
299 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
300 | } else | |
301 | read_unlock_bh(&neigh->lock); | |
302 | } | |
303 | #else | |
304 | static inline void rt6_probe(struct rt6_info *rt) | |
305 | { | |
306 | return; | |
307 | } | |
308 | #endif | |
309 | ||
1da177e4 | 310 | /* |
554cfb7e | 311 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 312 | */ |
b6f99a21 | 313 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
314 | { |
315 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 316 | if (!oif || dev->ifindex == oif) |
554cfb7e | 317 | return 2; |
161980f4 DM |
318 | if ((dev->flags & IFF_LOOPBACK) && |
319 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
320 | return 1; | |
321 | return 0; | |
554cfb7e | 322 | } |
1da177e4 | 323 | |
b6f99a21 | 324 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 325 | { |
554cfb7e | 326 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 327 | int m; |
4d0c5911 YH |
328 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
329 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
330 | m = 1; | |
331 | else if (neigh) { | |
554cfb7e YH |
332 | read_lock_bh(&neigh->lock); |
333 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 334 | m = 2; |
398bcbeb YH |
335 | #ifdef CONFIG_IPV6_ROUTER_PREF |
336 | else if (neigh->nud_state & NUD_FAILED) | |
337 | m = 0; | |
338 | #endif | |
339 | else | |
ea73ee23 | 340 | m = 1; |
554cfb7e | 341 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
342 | } else |
343 | m = 0; | |
554cfb7e | 344 | return m; |
1da177e4 LT |
345 | } |
346 | ||
554cfb7e YH |
347 | static int rt6_score_route(struct rt6_info *rt, int oif, |
348 | int strict) | |
1da177e4 | 349 | { |
4d0c5911 | 350 | int m, n; |
1ab1457c | 351 | |
4d0c5911 | 352 | m = rt6_check_dev(rt, oif); |
77d16f45 | 353 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 354 | return -1; |
ebacaaa0 YH |
355 | #ifdef CONFIG_IPV6_ROUTER_PREF |
356 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
357 | #endif | |
4d0c5911 | 358 | n = rt6_check_neigh(rt); |
557e92ef | 359 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
360 | return -1; |
361 | return m; | |
362 | } | |
363 | ||
f11e6659 DM |
364 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
365 | int *mpri, struct rt6_info *match) | |
554cfb7e | 366 | { |
f11e6659 DM |
367 | int m; |
368 | ||
369 | if (rt6_check_expired(rt)) | |
370 | goto out; | |
371 | ||
372 | m = rt6_score_route(rt, oif, strict); | |
373 | if (m < 0) | |
374 | goto out; | |
375 | ||
376 | if (m > *mpri) { | |
377 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
378 | rt6_probe(match); | |
379 | *mpri = m; | |
380 | match = rt; | |
381 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
382 | rt6_probe(rt); | |
383 | } | |
384 | ||
385 | out: | |
386 | return match; | |
387 | } | |
388 | ||
389 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
390 | struct rt6_info *rr_head, | |
391 | u32 metric, int oif, int strict) | |
392 | { | |
393 | struct rt6_info *rt, *match; | |
554cfb7e | 394 | int mpri = -1; |
1da177e4 | 395 | |
f11e6659 DM |
396 | match = NULL; |
397 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
398 | rt = rt->u.dst.rt6_next) | |
399 | match = find_match(rt, oif, strict, &mpri, match); | |
400 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
401 | rt = rt->u.dst.rt6_next) | |
402 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 403 | |
f11e6659 DM |
404 | return match; |
405 | } | |
1da177e4 | 406 | |
f11e6659 DM |
407 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
408 | { | |
409 | struct rt6_info *match, *rt0; | |
1da177e4 | 410 | |
f11e6659 DM |
411 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
412 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 413 | |
f11e6659 DM |
414 | rt0 = fn->rr_ptr; |
415 | if (!rt0) | |
416 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 417 | |
f11e6659 | 418 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 419 | |
554cfb7e | 420 | if (!match && |
f11e6659 DM |
421 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
422 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
423 | ||
554cfb7e | 424 | /* no entries matched; do round-robin */ |
f11e6659 DM |
425 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
426 | next = fn->leaf; | |
427 | ||
428 | if (next != rt0) | |
429 | fn->rr_ptr = next; | |
1da177e4 | 430 | } |
1da177e4 | 431 | |
f11e6659 DM |
432 | RT6_TRACE("%s() => %p\n", |
433 | __FUNCTION__, match); | |
1da177e4 | 434 | |
554cfb7e | 435 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
436 | } |
437 | ||
70ceb4f5 YH |
438 | #ifdef CONFIG_IPV6_ROUTE_INFO |
439 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
440 | struct in6_addr *gwaddr) | |
441 | { | |
442 | struct route_info *rinfo = (struct route_info *) opt; | |
443 | struct in6_addr prefix_buf, *prefix; | |
444 | unsigned int pref; | |
445 | u32 lifetime; | |
446 | struct rt6_info *rt; | |
447 | ||
448 | if (len < sizeof(struct route_info)) { | |
449 | return -EINVAL; | |
450 | } | |
451 | ||
452 | /* Sanity check for prefix_len and length */ | |
453 | if (rinfo->length > 3) { | |
454 | return -EINVAL; | |
455 | } else if (rinfo->prefix_len > 128) { | |
456 | return -EINVAL; | |
457 | } else if (rinfo->prefix_len > 64) { | |
458 | if (rinfo->length < 2) { | |
459 | return -EINVAL; | |
460 | } | |
461 | } else if (rinfo->prefix_len > 0) { | |
462 | if (rinfo->length < 1) { | |
463 | return -EINVAL; | |
464 | } | |
465 | } | |
466 | ||
467 | pref = rinfo->route_pref; | |
468 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
469 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
470 | ||
e69a4adc | 471 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
472 | if (lifetime == 0xffffffff) { |
473 | /* infinity */ | |
474 | } else if (lifetime > 0x7fffffff/HZ) { | |
475 | /* Avoid arithmetic overflow */ | |
476 | lifetime = 0x7fffffff/HZ - 1; | |
477 | } | |
478 | ||
479 | if (rinfo->length == 3) | |
480 | prefix = (struct in6_addr *)rinfo->prefix; | |
481 | else { | |
482 | /* this function is safe */ | |
483 | ipv6_addr_prefix(&prefix_buf, | |
484 | (struct in6_addr *)rinfo->prefix, | |
485 | rinfo->prefix_len); | |
486 | prefix = &prefix_buf; | |
487 | } | |
488 | ||
489 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
490 | ||
491 | if (rt && !lifetime) { | |
e0a1ad73 | 492 | ip6_del_rt(rt); |
70ceb4f5 YH |
493 | rt = NULL; |
494 | } | |
495 | ||
496 | if (!rt && lifetime) | |
497 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
498 | pref); | |
499 | else if (rt) | |
500 | rt->rt6i_flags = RTF_ROUTEINFO | | |
501 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
502 | ||
503 | if (rt) { | |
504 | if (lifetime == 0xffffffff) { | |
505 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
506 | } else { | |
507 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
508 | rt->rt6i_flags |= RTF_EXPIRES; | |
509 | } | |
510 | dst_release(&rt->u.dst); | |
511 | } | |
512 | return 0; | |
513 | } | |
514 | #endif | |
515 | ||
982f56f3 YH |
516 | #define BACKTRACK(saddr) \ |
517 | do { \ | |
518 | if (rt == &ip6_null_entry) { \ | |
519 | struct fib6_node *pn; \ | |
e0eda7bb | 520 | while (1) { \ |
982f56f3 YH |
521 | if (fn->fn_flags & RTN_TL_ROOT) \ |
522 | goto out; \ | |
523 | pn = fn->parent; \ | |
524 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 525 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
526 | else \ |
527 | fn = pn; \ | |
528 | if (fn->fn_flags & RTN_RTINFO) \ | |
529 | goto restart; \ | |
c71099ac | 530 | } \ |
c71099ac | 531 | } \ |
982f56f3 | 532 | } while(0) |
c71099ac TG |
533 | |
534 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
535 | struct flowi *fl, int flags) | |
1da177e4 LT |
536 | { |
537 | struct fib6_node *fn; | |
538 | struct rt6_info *rt; | |
539 | ||
c71099ac TG |
540 | read_lock_bh(&table->tb6_lock); |
541 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
542 | restart: | |
543 | rt = fn->leaf; | |
77d16f45 | 544 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 545 | BACKTRACK(&fl->fl6_src); |
c71099ac | 546 | out: |
03f49f34 | 547 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 548 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
549 | return rt; |
550 | ||
551 | } | |
552 | ||
553 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
554 | int oif, int strict) | |
555 | { | |
556 | struct flowi fl = { | |
557 | .oif = oif, | |
558 | .nl_u = { | |
559 | .ip6_u = { | |
560 | .daddr = *daddr, | |
c71099ac TG |
561 | }, |
562 | }, | |
563 | }; | |
564 | struct dst_entry *dst; | |
77d16f45 | 565 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 566 | |
adaa70bb TG |
567 | if (saddr) { |
568 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
569 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
570 | } | |
571 | ||
c71099ac TG |
572 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
573 | if (dst->error == 0) | |
574 | return (struct rt6_info *) dst; | |
575 | ||
576 | dst_release(dst); | |
577 | ||
1da177e4 LT |
578 | return NULL; |
579 | } | |
580 | ||
7159039a YH |
581 | EXPORT_SYMBOL(rt6_lookup); |
582 | ||
c71099ac | 583 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
584 | It takes new route entry, the addition fails by any reason the |
585 | route is freed. In any case, if caller does not hold it, it may | |
586 | be destroyed. | |
587 | */ | |
588 | ||
86872cb5 | 589 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
590 | { |
591 | int err; | |
c71099ac | 592 | struct fib6_table *table; |
1da177e4 | 593 | |
c71099ac TG |
594 | table = rt->rt6i_table; |
595 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 596 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 597 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
598 | |
599 | return err; | |
600 | } | |
601 | ||
40e22e8f TG |
602 | int ip6_ins_rt(struct rt6_info *rt) |
603 | { | |
528c4ceb DL |
604 | struct nl_info info = {}; |
605 | return __ip6_ins_rt(rt, &info); | |
40e22e8f TG |
606 | } |
607 | ||
95a9a5ba YH |
608 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
609 | struct in6_addr *saddr) | |
1da177e4 | 610 | { |
1da177e4 LT |
611 | struct rt6_info *rt; |
612 | ||
613 | /* | |
614 | * Clone the route. | |
615 | */ | |
616 | ||
617 | rt = ip6_rt_copy(ort); | |
618 | ||
619 | if (rt) { | |
58c4fb86 YH |
620 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
621 | if (rt->rt6i_dst.plen != 128 && | |
622 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
623 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 624 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 625 | } |
1da177e4 | 626 | |
58c4fb86 | 627 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
628 | rt->rt6i_dst.plen = 128; |
629 | rt->rt6i_flags |= RTF_CACHE; | |
630 | rt->u.dst.flags |= DST_HOST; | |
631 | ||
632 | #ifdef CONFIG_IPV6_SUBTREES | |
633 | if (rt->rt6i_src.plen && saddr) { | |
634 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
635 | rt->rt6i_src.plen = 128; | |
636 | } | |
637 | #endif | |
638 | ||
639 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
640 | ||
95a9a5ba | 641 | } |
1da177e4 | 642 | |
95a9a5ba YH |
643 | return rt; |
644 | } | |
1da177e4 | 645 | |
299d9939 YH |
646 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
647 | { | |
648 | struct rt6_info *rt = ip6_rt_copy(ort); | |
649 | if (rt) { | |
650 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
651 | rt->rt6i_dst.plen = 128; | |
652 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
653 | rt->u.dst.flags |= DST_HOST; |
654 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
655 | } | |
656 | return rt; | |
657 | } | |
658 | ||
4acad72d | 659 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, |
8ce11e6a | 660 | struct flowi *fl, int flags) |
1da177e4 LT |
661 | { |
662 | struct fib6_node *fn; | |
519fbd87 | 663 | struct rt6_info *rt, *nrt; |
c71099ac | 664 | int strict = 0; |
1da177e4 | 665 | int attempts = 3; |
519fbd87 | 666 | int err; |
ea659e07 | 667 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 668 | |
77d16f45 | 669 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
670 | |
671 | relookup: | |
c71099ac | 672 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 673 | |
8238dd06 | 674 | restart_2: |
c71099ac | 675 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
676 | |
677 | restart: | |
4acad72d | 678 | rt = rt6_select(fn, oif, strict | reachable); |
982f56f3 | 679 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
680 | if (rt == &ip6_null_entry || |
681 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 682 | goto out; |
1da177e4 | 683 | |
fb9de91e | 684 | dst_hold(&rt->u.dst); |
c71099ac | 685 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 686 | |
519fbd87 | 687 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 688 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
689 | else { |
690 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 691 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
692 | #else |
693 | goto out2; | |
694 | #endif | |
695 | } | |
e40cf353 | 696 | |
519fbd87 YH |
697 | dst_release(&rt->u.dst); |
698 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 699 | |
519fbd87 YH |
700 | dst_hold(&rt->u.dst); |
701 | if (nrt) { | |
40e22e8f | 702 | err = ip6_ins_rt(nrt); |
519fbd87 | 703 | if (!err) |
1da177e4 | 704 | goto out2; |
1da177e4 | 705 | } |
1da177e4 | 706 | |
519fbd87 YH |
707 | if (--attempts <= 0) |
708 | goto out2; | |
709 | ||
710 | /* | |
c71099ac | 711 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
712 | * released someone could insert this route. Relookup. |
713 | */ | |
714 | dst_release(&rt->u.dst); | |
715 | goto relookup; | |
716 | ||
717 | out: | |
8238dd06 YH |
718 | if (reachable) { |
719 | reachable = 0; | |
720 | goto restart_2; | |
721 | } | |
519fbd87 | 722 | dst_hold(&rt->u.dst); |
c71099ac | 723 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
724 | out2: |
725 | rt->u.dst.lastuse = jiffies; | |
726 | rt->u.dst.__use++; | |
c71099ac TG |
727 | |
728 | return rt; | |
1da177e4 LT |
729 | } |
730 | ||
4acad72d PE |
731 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
732 | struct flowi *fl, int flags) | |
733 | { | |
734 | return ip6_pol_route(table, fl->iif, fl, flags); | |
735 | } | |
736 | ||
c71099ac TG |
737 | void ip6_route_input(struct sk_buff *skb) |
738 | { | |
0660e03f | 739 | struct ipv6hdr *iph = ipv6_hdr(skb); |
adaa70bb | 740 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
741 | struct flowi fl = { |
742 | .iif = skb->dev->ifindex, | |
743 | .nl_u = { | |
744 | .ip6_u = { | |
745 | .daddr = iph->daddr, | |
746 | .saddr = iph->saddr, | |
90bcaf7b | 747 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
748 | }, |
749 | }, | |
1ab1457c | 750 | .mark = skb->mark, |
c71099ac TG |
751 | .proto = iph->nexthdr, |
752 | }; | |
adaa70bb TG |
753 | |
754 | if (rt6_need_strict(&iph->daddr)) | |
755 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
756 | |
757 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
758 | } | |
759 | ||
760 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
761 | struct flowi *fl, int flags) | |
1da177e4 | 762 | { |
4acad72d | 763 | return ip6_pol_route(table, fl->oif, fl, flags); |
c71099ac TG |
764 | } |
765 | ||
766 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
767 | { | |
768 | int flags = 0; | |
769 | ||
770 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 771 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 772 | |
adaa70bb TG |
773 | if (!ipv6_addr_any(&fl->fl6_src)) |
774 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
775 | ||
c71099ac | 776 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
777 | } |
778 | ||
7159039a | 779 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 780 | |
14e50e57 DM |
781 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
782 | { | |
783 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
784 | struct rt6_info *rt = (struct rt6_info *) | |
785 | dst_alloc(&ip6_dst_blackhole_ops); | |
786 | struct dst_entry *new = NULL; | |
787 | ||
788 | if (rt) { | |
789 | new = &rt->u.dst; | |
790 | ||
791 | atomic_set(&new->__refcnt, 1); | |
792 | new->__use = 1; | |
352e512c HX |
793 | new->input = dst_discard; |
794 | new->output = dst_discard; | |
14e50e57 DM |
795 | |
796 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
797 | new->dev = ort->u.dst.dev; | |
798 | if (new->dev) | |
799 | dev_hold(new->dev); | |
800 | rt->rt6i_idev = ort->rt6i_idev; | |
801 | if (rt->rt6i_idev) | |
802 | in6_dev_hold(rt->rt6i_idev); | |
803 | rt->rt6i_expires = 0; | |
804 | ||
805 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
806 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
807 | rt->rt6i_metric = 0; | |
808 | ||
809 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
810 | #ifdef CONFIG_IPV6_SUBTREES | |
811 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
812 | #endif | |
813 | ||
814 | dst_free(new); | |
815 | } | |
816 | ||
817 | dst_release(*dstp); | |
818 | *dstp = new; | |
819 | return (new ? 0 : -ENOMEM); | |
820 | } | |
821 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
822 | ||
1da177e4 LT |
823 | /* |
824 | * Destination cache support functions | |
825 | */ | |
826 | ||
827 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
828 | { | |
829 | struct rt6_info *rt; | |
830 | ||
831 | rt = (struct rt6_info *) dst; | |
832 | ||
833 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
834 | return dst; | |
835 | ||
836 | return NULL; | |
837 | } | |
838 | ||
839 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
840 | { | |
841 | struct rt6_info *rt = (struct rt6_info *) dst; | |
842 | ||
843 | if (rt) { | |
844 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 845 | ip6_del_rt(rt); |
1da177e4 LT |
846 | else |
847 | dst_release(dst); | |
848 | } | |
849 | return NULL; | |
850 | } | |
851 | ||
852 | static void ip6_link_failure(struct sk_buff *skb) | |
853 | { | |
854 | struct rt6_info *rt; | |
855 | ||
856 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
857 | ||
858 | rt = (struct rt6_info *) skb->dst; | |
859 | if (rt) { | |
860 | if (rt->rt6i_flags&RTF_CACHE) { | |
861 | dst_set_expires(&rt->u.dst, 0); | |
862 | rt->rt6i_flags |= RTF_EXPIRES; | |
863 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
864 | rt->rt6i_node->fn_sernum = -1; | |
865 | } | |
866 | } | |
867 | ||
868 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
869 | { | |
870 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
871 | ||
872 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
873 | rt6->rt6i_flags |= RTF_MODIFIED; | |
874 | if (mtu < IPV6_MIN_MTU) { | |
875 | mtu = IPV6_MIN_MTU; | |
876 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
877 | } | |
878 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 879 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
880 | } |
881 | } | |
882 | ||
1da177e4 LT |
883 | static int ipv6_get_mtu(struct net_device *dev); |
884 | ||
885 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
886 | { | |
887 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
888 | ||
4990509f DL |
889 | if (mtu < init_net.ipv6.sysctl.ip6_rt_min_advmss) |
890 | mtu = init_net.ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
891 | |
892 | /* | |
1ab1457c YH |
893 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
894 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
895 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
896 | * rely only on pmtu discovery" |
897 | */ | |
898 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
899 | mtu = IPV6_MAXPLEN; | |
900 | return mtu; | |
901 | } | |
902 | ||
5d0bbeeb | 903 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 904 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 905 | |
1ab1457c | 906 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
1da177e4 LT |
907 | struct neighbour *neigh, |
908 | struct in6_addr *addr, | |
909 | int (*output)(struct sk_buff *)) | |
910 | { | |
911 | struct rt6_info *rt; | |
912 | struct inet6_dev *idev = in6_dev_get(dev); | |
913 | ||
914 | if (unlikely(idev == NULL)) | |
915 | return NULL; | |
916 | ||
917 | rt = ip6_dst_alloc(); | |
918 | if (unlikely(rt == NULL)) { | |
919 | in6_dev_put(idev); | |
920 | goto out; | |
921 | } | |
922 | ||
923 | dev_hold(dev); | |
924 | if (neigh) | |
925 | neigh_hold(neigh); | |
926 | else | |
927 | neigh = ndisc_get_neigh(dev, addr); | |
928 | ||
929 | rt->rt6i_dev = dev; | |
930 | rt->rt6i_idev = idev; | |
931 | rt->rt6i_nexthop = neigh; | |
932 | atomic_set(&rt->u.dst.__refcnt, 1); | |
933 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
934 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
935 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
936 | rt->u.dst.output = output; | |
937 | ||
938 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
939 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
940 | ? DST_HOST | |
1da177e4 LT |
941 | : 0; |
942 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
943 | rt->rt6i_dst.plen = 128; | |
944 | #endif | |
945 | ||
5d0bbeeb | 946 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
947 | rt->u.dst.next = ndisc_dst_gc_list; |
948 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 949 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
950 | |
951 | fib6_force_start_gc(); | |
952 | ||
953 | out: | |
40aa7b90 | 954 | return &rt->u.dst; |
1da177e4 LT |
955 | } |
956 | ||
957 | int ndisc_dst_gc(int *more) | |
958 | { | |
959 | struct dst_entry *dst, *next, **pprev; | |
960 | int freed; | |
961 | ||
962 | next = NULL; | |
1ab1457c | 963 | freed = 0; |
5d0bbeeb TG |
964 | |
965 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 966 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 967 | |
1da177e4 LT |
968 | while ((dst = *pprev) != NULL) { |
969 | if (!atomic_read(&dst->__refcnt)) { | |
970 | *pprev = dst->next; | |
971 | dst_free(dst); | |
972 | freed++; | |
973 | } else { | |
974 | pprev = &dst->next; | |
975 | (*more)++; | |
976 | } | |
977 | } | |
978 | ||
5d0bbeeb TG |
979 | spin_unlock_bh(&ndisc_lock); |
980 | ||
1da177e4 LT |
981 | return freed; |
982 | } | |
983 | ||
984 | static int ip6_dst_gc(void) | |
985 | { | |
986 | static unsigned expire = 30*HZ; | |
987 | static unsigned long last_gc; | |
988 | unsigned long now = jiffies; | |
989 | ||
4990509f DL |
990 | if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && |
991 | atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) | |
1da177e4 LT |
992 | goto out; |
993 | ||
994 | expire++; | |
995 | fib6_run_gc(expire); | |
996 | last_gc = now; | |
997 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
4990509f | 998 | expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; |
1da177e4 LT |
999 | |
1000 | out: | |
4990509f DL |
1001 | expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; |
1002 | return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size); | |
1da177e4 LT |
1003 | } |
1004 | ||
1005 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1006 | but results in cleaner routing tables. | |
1007 | ||
1008 | Remove it only when all the things will work! | |
1009 | */ | |
1010 | ||
1011 | static int ipv6_get_mtu(struct net_device *dev) | |
1012 | { | |
1013 | int mtu = IPV6_MIN_MTU; | |
1014 | struct inet6_dev *idev; | |
1015 | ||
1016 | idev = in6_dev_get(dev); | |
1017 | if (idev) { | |
1018 | mtu = idev->cnf.mtu6; | |
1019 | in6_dev_put(idev); | |
1020 | } | |
1021 | return mtu; | |
1022 | } | |
1023 | ||
1024 | int ipv6_get_hoplimit(struct net_device *dev) | |
1025 | { | |
1026 | int hoplimit = ipv6_devconf.hop_limit; | |
1027 | struct inet6_dev *idev; | |
1028 | ||
1029 | idev = in6_dev_get(dev); | |
1030 | if (idev) { | |
1031 | hoplimit = idev->cnf.hop_limit; | |
1032 | in6_dev_put(idev); | |
1033 | } | |
1034 | return hoplimit; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * | |
1039 | */ | |
1040 | ||
86872cb5 | 1041 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1042 | { |
1043 | int err; | |
1da177e4 LT |
1044 | struct rt6_info *rt = NULL; |
1045 | struct net_device *dev = NULL; | |
1046 | struct inet6_dev *idev = NULL; | |
c71099ac | 1047 | struct fib6_table *table; |
1da177e4 LT |
1048 | int addr_type; |
1049 | ||
86872cb5 | 1050 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1051 | return -EINVAL; |
1052 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1053 | if (cfg->fc_src_len) |
1da177e4 LT |
1054 | return -EINVAL; |
1055 | #endif | |
86872cb5 | 1056 | if (cfg->fc_ifindex) { |
1da177e4 | 1057 | err = -ENODEV; |
881d966b | 1058 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
1da177e4 LT |
1059 | if (!dev) |
1060 | goto out; | |
1061 | idev = in6_dev_get(dev); | |
1062 | if (!idev) | |
1063 | goto out; | |
1064 | } | |
1065 | ||
86872cb5 TG |
1066 | if (cfg->fc_metric == 0) |
1067 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1068 | |
86872cb5 | 1069 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1070 | if (table == NULL) { |
1071 | err = -ENOBUFS; | |
1072 | goto out; | |
1073 | } | |
1074 | ||
1da177e4 LT |
1075 | rt = ip6_dst_alloc(); |
1076 | ||
1077 | if (rt == NULL) { | |
1078 | err = -ENOMEM; | |
1079 | goto out; | |
1080 | } | |
1081 | ||
1082 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1083 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1084 | |
86872cb5 TG |
1085 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1086 | cfg->fc_protocol = RTPROT_BOOT; | |
1087 | rt->rt6i_protocol = cfg->fc_protocol; | |
1088 | ||
1089 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1090 | |
1091 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1092 | rt->u.dst.input = ip6_mc_input; | |
1093 | else | |
1094 | rt->u.dst.input = ip6_forward; | |
1095 | ||
1096 | rt->u.dst.output = ip6_output; | |
1097 | ||
86872cb5 TG |
1098 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1099 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1100 | if (rt->rt6i_dst.plen == 128) |
1101 | rt->u.dst.flags = DST_HOST; | |
1102 | ||
1103 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1104 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1105 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1106 | #endif |
1107 | ||
86872cb5 | 1108 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1109 | |
1110 | /* We cannot add true routes via loopback here, | |
1111 | they would result in kernel looping; promote them to reject routes | |
1112 | */ | |
86872cb5 | 1113 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1114 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1115 | /* hold loopback dev/idev if we haven't done so. */ | |
2774c7ab | 1116 | if (dev != init_net.loopback_dev) { |
1da177e4 LT |
1117 | if (dev) { |
1118 | dev_put(dev); | |
1119 | in6_dev_put(idev); | |
1120 | } | |
2774c7ab | 1121 | dev = init_net.loopback_dev; |
1da177e4 LT |
1122 | dev_hold(dev); |
1123 | idev = in6_dev_get(dev); | |
1124 | if (!idev) { | |
1125 | err = -ENODEV; | |
1126 | goto out; | |
1127 | } | |
1128 | } | |
1129 | rt->u.dst.output = ip6_pkt_discard_out; | |
1130 | rt->u.dst.input = ip6_pkt_discard; | |
1131 | rt->u.dst.error = -ENETUNREACH; | |
1132 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1133 | goto install_route; | |
1134 | } | |
1135 | ||
86872cb5 | 1136 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1137 | struct in6_addr *gw_addr; |
1138 | int gwa_type; | |
1139 | ||
86872cb5 TG |
1140 | gw_addr = &cfg->fc_gateway; |
1141 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1142 | gwa_type = ipv6_addr_type(gw_addr); |
1143 | ||
1144 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1145 | struct rt6_info *grt; | |
1146 | ||
1147 | /* IPv6 strictly inhibits using not link-local | |
1148 | addresses as nexthop address. | |
1149 | Otherwise, router will not able to send redirects. | |
1150 | It is very good, but in some (rare!) circumstances | |
1151 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1152 | some exceptions. --ANK | |
1153 | */ | |
1154 | err = -EINVAL; | |
1155 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1156 | goto out; | |
1157 | ||
86872cb5 | 1158 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1159 | |
1160 | err = -EHOSTUNREACH; | |
1161 | if (grt == NULL) | |
1162 | goto out; | |
1163 | if (dev) { | |
1164 | if (dev != grt->rt6i_dev) { | |
1165 | dst_release(&grt->u.dst); | |
1166 | goto out; | |
1167 | } | |
1168 | } else { | |
1169 | dev = grt->rt6i_dev; | |
1170 | idev = grt->rt6i_idev; | |
1171 | dev_hold(dev); | |
1172 | in6_dev_hold(grt->rt6i_idev); | |
1173 | } | |
1174 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1175 | err = 0; | |
1176 | dst_release(&grt->u.dst); | |
1177 | ||
1178 | if (err) | |
1179 | goto out; | |
1180 | } | |
1181 | err = -EINVAL; | |
1182 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1183 | goto out; | |
1184 | } | |
1185 | ||
1186 | err = -ENODEV; | |
1187 | if (dev == NULL) | |
1188 | goto out; | |
1189 | ||
86872cb5 | 1190 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1191 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1192 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1193 | err = PTR_ERR(rt->rt6i_nexthop); | |
1194 | rt->rt6i_nexthop = NULL; | |
1195 | goto out; | |
1196 | } | |
1197 | } | |
1198 | ||
86872cb5 | 1199 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1200 | |
1201 | install_route: | |
86872cb5 TG |
1202 | if (cfg->fc_mx) { |
1203 | struct nlattr *nla; | |
1204 | int remaining; | |
1205 | ||
1206 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1207 | int type = nla_type(nla); |
86872cb5 TG |
1208 | |
1209 | if (type) { | |
1210 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1211 | err = -EINVAL; |
1212 | goto out; | |
1213 | } | |
86872cb5 TG |
1214 | |
1215 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1216 | } |
1da177e4 LT |
1217 | } |
1218 | } | |
1219 | ||
1220 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1221 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1222 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1223 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1224 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1225 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1226 | rt->u.dst.dev = dev; | |
1227 | rt->rt6i_idev = idev; | |
c71099ac | 1228 | rt->rt6i_table = table; |
86872cb5 | 1229 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1230 | |
1231 | out: | |
1232 | if (dev) | |
1233 | dev_put(dev); | |
1234 | if (idev) | |
1235 | in6_dev_put(idev); | |
1236 | if (rt) | |
40aa7b90 | 1237 | dst_free(&rt->u.dst); |
1da177e4 LT |
1238 | return err; |
1239 | } | |
1240 | ||
86872cb5 | 1241 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1242 | { |
1243 | int err; | |
c71099ac | 1244 | struct fib6_table *table; |
1da177e4 | 1245 | |
6c813a72 PM |
1246 | if (rt == &ip6_null_entry) |
1247 | return -ENOENT; | |
1248 | ||
c71099ac TG |
1249 | table = rt->rt6i_table; |
1250 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1251 | |
86872cb5 | 1252 | err = fib6_del(rt, info); |
1da177e4 LT |
1253 | dst_release(&rt->u.dst); |
1254 | ||
c71099ac | 1255 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1256 | |
1257 | return err; | |
1258 | } | |
1259 | ||
e0a1ad73 TG |
1260 | int ip6_del_rt(struct rt6_info *rt) |
1261 | { | |
528c4ceb DL |
1262 | struct nl_info info = {}; |
1263 | return __ip6_del_rt(rt, &info); | |
e0a1ad73 TG |
1264 | } |
1265 | ||
86872cb5 | 1266 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1267 | { |
c71099ac | 1268 | struct fib6_table *table; |
1da177e4 LT |
1269 | struct fib6_node *fn; |
1270 | struct rt6_info *rt; | |
1271 | int err = -ESRCH; | |
1272 | ||
86872cb5 | 1273 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1274 | if (table == NULL) |
1275 | return err; | |
1276 | ||
1277 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1278 | |
c71099ac | 1279 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1280 | &cfg->fc_dst, cfg->fc_dst_len, |
1281 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1282 | |
1da177e4 | 1283 | if (fn) { |
7cc48263 | 1284 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1285 | if (cfg->fc_ifindex && |
1da177e4 | 1286 | (rt->rt6i_dev == NULL || |
86872cb5 | 1287 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1288 | continue; |
86872cb5 TG |
1289 | if (cfg->fc_flags & RTF_GATEWAY && |
1290 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1291 | continue; |
86872cb5 | 1292 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1293 | continue; |
1294 | dst_hold(&rt->u.dst); | |
c71099ac | 1295 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1296 | |
86872cb5 | 1297 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1298 | } |
1299 | } | |
c71099ac | 1300 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1301 | |
1302 | return err; | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * Handle redirects | |
1307 | */ | |
a6279458 YH |
1308 | struct ip6rd_flowi { |
1309 | struct flowi fl; | |
1310 | struct in6_addr gateway; | |
1311 | }; | |
1312 | ||
1313 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1314 | struct flowi *fl, | |
1315 | int flags) | |
1da177e4 | 1316 | { |
a6279458 YH |
1317 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1318 | struct rt6_info *rt; | |
e843b9e1 | 1319 | struct fib6_node *fn; |
c71099ac | 1320 | |
1da177e4 | 1321 | /* |
e843b9e1 YH |
1322 | * Get the "current" route for this destination and |
1323 | * check if the redirect has come from approriate router. | |
1324 | * | |
1325 | * RFC 2461 specifies that redirects should only be | |
1326 | * accepted if they come from the nexthop to the target. | |
1327 | * Due to the way the routes are chosen, this notion | |
1328 | * is a bit fuzzy and one might need to check all possible | |
1329 | * routes. | |
1da177e4 | 1330 | */ |
1da177e4 | 1331 | |
c71099ac | 1332 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1333 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1334 | restart: |
7cc48263 | 1335 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1336 | /* |
1337 | * Current route is on-link; redirect is always invalid. | |
1338 | * | |
1339 | * Seems, previous statement is not true. It could | |
1340 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1341 | * But then router serving it might decide, that we should | |
1342 | * know truth 8)8) --ANK (980726). | |
1343 | */ | |
1344 | if (rt6_check_expired(rt)) | |
1345 | continue; | |
1346 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1347 | continue; | |
a6279458 | 1348 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1349 | continue; |
a6279458 | 1350 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1351 | continue; |
1352 | break; | |
1353 | } | |
a6279458 | 1354 | |
cb15d9c2 | 1355 | if (!rt) |
a6279458 | 1356 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1357 | BACKTRACK(&fl->fl6_src); |
1358 | out: | |
a6279458 YH |
1359 | dst_hold(&rt->u.dst); |
1360 | ||
c71099ac | 1361 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1362 | |
a6279458 YH |
1363 | return rt; |
1364 | }; | |
1365 | ||
1366 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1367 | struct in6_addr *src, | |
1368 | struct in6_addr *gateway, | |
1369 | struct net_device *dev) | |
1370 | { | |
adaa70bb | 1371 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1372 | struct ip6rd_flowi rdfl = { |
1373 | .fl = { | |
1374 | .oif = dev->ifindex, | |
1375 | .nl_u = { | |
1376 | .ip6_u = { | |
1377 | .daddr = *dest, | |
1378 | .saddr = *src, | |
1379 | }, | |
1380 | }, | |
1381 | }, | |
1382 | .gateway = *gateway, | |
1383 | }; | |
adaa70bb TG |
1384 | |
1385 | if (rt6_need_strict(dest)) | |
1386 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1387 | |
1388 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1389 | } | |
1390 | ||
1391 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1392 | struct in6_addr *saddr, | |
1393 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1394 | { | |
1395 | struct rt6_info *rt, *nrt = NULL; | |
1396 | struct netevent_redirect netevent; | |
1397 | ||
1398 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1399 | ||
1400 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1401 | if (net_ratelimit()) |
1402 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1403 | "for redirect target\n"); | |
a6279458 | 1404 | goto out; |
1da177e4 LT |
1405 | } |
1406 | ||
1da177e4 LT |
1407 | /* |
1408 | * We have finally decided to accept it. | |
1409 | */ | |
1410 | ||
1ab1457c | 1411 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1412 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1413 | NEIGH_UPDATE_F_OVERRIDE| | |
1414 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1415 | NEIGH_UPDATE_F_ISROUTER)) | |
1416 | ); | |
1417 | ||
1418 | /* | |
1419 | * Redirect received -> path was valid. | |
1420 | * Look, redirects are sent only in response to data packets, | |
1421 | * so that this nexthop apparently is reachable. --ANK | |
1422 | */ | |
1423 | dst_confirm(&rt->u.dst); | |
1424 | ||
1425 | /* Duplicate redirect: silently ignore. */ | |
1426 | if (neigh == rt->u.dst.neighbour) | |
1427 | goto out; | |
1428 | ||
1429 | nrt = ip6_rt_copy(rt); | |
1430 | if (nrt == NULL) | |
1431 | goto out; | |
1432 | ||
1433 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1434 | if (on_link) | |
1435 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1436 | ||
1437 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1438 | nrt->rt6i_dst.plen = 128; | |
1439 | nrt->u.dst.flags |= DST_HOST; | |
1440 | ||
1441 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1442 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1443 | /* Reset pmtu, it may be better */ | |
1444 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1445 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1446 | ||
40e22e8f | 1447 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1448 | goto out; |
1449 | ||
8d71740c TT |
1450 | netevent.old = &rt->u.dst; |
1451 | netevent.new = &nrt->u.dst; | |
1452 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1453 | ||
1da177e4 | 1454 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1455 | ip6_del_rt(rt); |
1da177e4 LT |
1456 | return; |
1457 | } | |
1458 | ||
1459 | out: | |
1ab1457c | 1460 | dst_release(&rt->u.dst); |
1da177e4 LT |
1461 | return; |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * Handle ICMP "packet too big" messages | |
1466 | * i.e. Path MTU discovery | |
1467 | */ | |
1468 | ||
1469 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1470 | struct net_device *dev, u32 pmtu) | |
1471 | { | |
1472 | struct rt6_info *rt, *nrt; | |
1473 | int allfrag = 0; | |
1474 | ||
1475 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1476 | if (rt == NULL) | |
1477 | return; | |
1478 | ||
1479 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1480 | goto out; | |
1481 | ||
1482 | if (pmtu < IPV6_MIN_MTU) { | |
1483 | /* | |
1ab1457c | 1484 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1485 | * MTU (1280) and a fragment header should always be included |
1486 | * after a node receiving Too Big message reporting PMTU is | |
1487 | * less than the IPv6 Minimum Link MTU. | |
1488 | */ | |
1489 | pmtu = IPV6_MIN_MTU; | |
1490 | allfrag = 1; | |
1491 | } | |
1492 | ||
1493 | /* New mtu received -> path was valid. | |
1494 | They are sent only in response to data packets, | |
1495 | so that this nexthop apparently is reachable. --ANK | |
1496 | */ | |
1497 | dst_confirm(&rt->u.dst); | |
1498 | ||
1499 | /* Host route. If it is static, it would be better | |
1500 | not to override it, but add new one, so that | |
1501 | when cache entry will expire old pmtu | |
1502 | would return automatically. | |
1503 | */ | |
1504 | if (rt->rt6i_flags & RTF_CACHE) { | |
1505 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1506 | if (allfrag) | |
1507 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
4990509f | 1508 | dst_set_expires(&rt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1509 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1510 | goto out; | |
1511 | } | |
1512 | ||
1513 | /* Network route. | |
1514 | Two cases are possible: | |
1515 | 1. It is connected route. Action: COW | |
1516 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1517 | */ | |
d5315b50 | 1518 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1519 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1520 | else |
1521 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1522 | |
d5315b50 | 1523 | if (nrt) { |
a1e78363 YH |
1524 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1525 | if (allfrag) | |
1526 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1527 | ||
1528 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1529 | * happened within 5 mins, the recommended timer is 10 mins. | |
1530 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1531 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1532 | * and detecting PMTU increase will be automatically happened. | |
1533 | */ | |
4990509f | 1534 | dst_set_expires(&nrt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1535 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1536 | ||
40e22e8f | 1537 | ip6_ins_rt(nrt); |
1da177e4 | 1538 | } |
1da177e4 LT |
1539 | out: |
1540 | dst_release(&rt->u.dst); | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Misc support functions | |
1545 | */ | |
1546 | ||
1547 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1548 | { | |
1549 | struct rt6_info *rt = ip6_dst_alloc(); | |
1550 | ||
1551 | if (rt) { | |
1552 | rt->u.dst.input = ort->u.dst.input; | |
1553 | rt->u.dst.output = ort->u.dst.output; | |
1554 | ||
1555 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1556 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1557 | rt->u.dst.dev = ort->u.dst.dev; |
1558 | if (rt->u.dst.dev) | |
1559 | dev_hold(rt->u.dst.dev); | |
1560 | rt->rt6i_idev = ort->rt6i_idev; | |
1561 | if (rt->rt6i_idev) | |
1562 | in6_dev_hold(rt->rt6i_idev); | |
1563 | rt->u.dst.lastuse = jiffies; | |
1564 | rt->rt6i_expires = 0; | |
1565 | ||
1566 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1567 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1568 | rt->rt6i_metric = 0; | |
1569 | ||
1570 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1571 | #ifdef CONFIG_IPV6_SUBTREES | |
1572 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1573 | #endif | |
c71099ac | 1574 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1575 | } |
1576 | return rt; | |
1577 | } | |
1578 | ||
70ceb4f5 YH |
1579 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1580 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1581 | struct in6_addr *gwaddr, int ifindex) | |
1582 | { | |
1583 | struct fib6_node *fn; | |
1584 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1585 | struct fib6_table *table; |
1586 | ||
1587 | table = fib6_get_table(RT6_TABLE_INFO); | |
1588 | if (table == NULL) | |
1589 | return NULL; | |
70ceb4f5 | 1590 | |
c71099ac TG |
1591 | write_lock_bh(&table->tb6_lock); |
1592 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1593 | if (!fn) |
1594 | goto out; | |
1595 | ||
7cc48263 | 1596 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1597 | if (rt->rt6i_dev->ifindex != ifindex) |
1598 | continue; | |
1599 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1600 | continue; | |
1601 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1602 | continue; | |
1603 | dst_hold(&rt->u.dst); | |
1604 | break; | |
1605 | } | |
1606 | out: | |
c71099ac | 1607 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1608 | return rt; |
1609 | } | |
1610 | ||
1611 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1612 | struct in6_addr *gwaddr, int ifindex, | |
1613 | unsigned pref) | |
1614 | { | |
86872cb5 TG |
1615 | struct fib6_config cfg = { |
1616 | .fc_table = RT6_TABLE_INFO, | |
1617 | .fc_metric = 1024, | |
1618 | .fc_ifindex = ifindex, | |
1619 | .fc_dst_len = prefixlen, | |
1620 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1621 | RTF_UP | RTF_PREF(pref), | |
1622 | }; | |
1623 | ||
1624 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1625 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1626 | |
e317da96 YH |
1627 | /* We should treat it as a default route if prefix length is 0. */ |
1628 | if (!prefixlen) | |
86872cb5 | 1629 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1630 | |
86872cb5 | 1631 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1632 | |
1633 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1634 | } | |
1635 | #endif | |
1636 | ||
1da177e4 | 1637 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1638 | { |
1da177e4 | 1639 | struct rt6_info *rt; |
c71099ac | 1640 | struct fib6_table *table; |
1da177e4 | 1641 | |
c71099ac TG |
1642 | table = fib6_get_table(RT6_TABLE_DFLT); |
1643 | if (table == NULL) | |
1644 | return NULL; | |
1da177e4 | 1645 | |
c71099ac | 1646 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1647 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1648 | if (dev == rt->rt6i_dev && |
045927ff | 1649 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1650 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1651 | break; | |
1652 | } | |
1653 | if (rt) | |
1654 | dst_hold(&rt->u.dst); | |
c71099ac | 1655 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1656 | return rt; |
1657 | } | |
1658 | ||
c7dc89c0 FT |
1659 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1660 | ||
1da177e4 | 1661 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1662 | struct net_device *dev, |
1663 | unsigned int pref) | |
1da177e4 | 1664 | { |
86872cb5 TG |
1665 | struct fib6_config cfg = { |
1666 | .fc_table = RT6_TABLE_DFLT, | |
1667 | .fc_metric = 1024, | |
1668 | .fc_ifindex = dev->ifindex, | |
1669 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1670 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1671 | }; | |
1da177e4 | 1672 | |
86872cb5 | 1673 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1674 | |
86872cb5 | 1675 | ip6_route_add(&cfg); |
1da177e4 | 1676 | |
1da177e4 LT |
1677 | return rt6_get_dflt_router(gwaddr, dev); |
1678 | } | |
1679 | ||
1680 | void rt6_purge_dflt_routers(void) | |
1681 | { | |
1682 | struct rt6_info *rt; | |
c71099ac TG |
1683 | struct fib6_table *table; |
1684 | ||
1685 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1686 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1687 | if (table == NULL) | |
1688 | return; | |
1da177e4 LT |
1689 | |
1690 | restart: | |
c71099ac | 1691 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1692 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1693 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1694 | dst_hold(&rt->u.dst); | |
c71099ac | 1695 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1696 | ip6_del_rt(rt); |
1da177e4 LT |
1697 | goto restart; |
1698 | } | |
1699 | } | |
c71099ac | 1700 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1701 | } |
1702 | ||
86872cb5 TG |
1703 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1704 | struct fib6_config *cfg) | |
1705 | { | |
1706 | memset(cfg, 0, sizeof(*cfg)); | |
1707 | ||
1708 | cfg->fc_table = RT6_TABLE_MAIN; | |
1709 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1710 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1711 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1712 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1713 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1714 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1715 | ||
1716 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1717 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1718 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1719 | } | |
1720 | ||
1da177e4 LT |
1721 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1722 | { | |
86872cb5 | 1723 | struct fib6_config cfg; |
1da177e4 LT |
1724 | struct in6_rtmsg rtmsg; |
1725 | int err; | |
1726 | ||
1727 | switch(cmd) { | |
1728 | case SIOCADDRT: /* Add a route */ | |
1729 | case SIOCDELRT: /* Delete a route */ | |
1730 | if (!capable(CAP_NET_ADMIN)) | |
1731 | return -EPERM; | |
1732 | err = copy_from_user(&rtmsg, arg, | |
1733 | sizeof(struct in6_rtmsg)); | |
1734 | if (err) | |
1735 | return -EFAULT; | |
86872cb5 TG |
1736 | |
1737 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1738 | ||
1da177e4 LT |
1739 | rtnl_lock(); |
1740 | switch (cmd) { | |
1741 | case SIOCADDRT: | |
86872cb5 | 1742 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1743 | break; |
1744 | case SIOCDELRT: | |
86872cb5 | 1745 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1746 | break; |
1747 | default: | |
1748 | err = -EINVAL; | |
1749 | } | |
1750 | rtnl_unlock(); | |
1751 | ||
1752 | return err; | |
3ff50b79 | 1753 | } |
1da177e4 LT |
1754 | |
1755 | return -EINVAL; | |
1756 | } | |
1757 | ||
1758 | /* | |
1759 | * Drop the packet on the floor | |
1760 | */ | |
1761 | ||
612f09e8 YH |
1762 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, |
1763 | int ipstats_mib_noroutes) | |
1da177e4 | 1764 | { |
612f09e8 YH |
1765 | int type; |
1766 | switch (ipstats_mib_noroutes) { | |
1767 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1768 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1769 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1770 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1771 | break; | |
1772 | } | |
1773 | /* FALLTHROUGH */ | |
1774 | case IPSTATS_MIB_OUTNOROUTES: | |
1775 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1776 | break; | |
1777 | } | |
9ce8ade0 | 1778 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1779 | kfree_skb(skb); |
1780 | return 0; | |
1781 | } | |
1782 | ||
9ce8ade0 TG |
1783 | static int ip6_pkt_discard(struct sk_buff *skb) |
1784 | { | |
612f09e8 | 1785 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1786 | } |
1787 | ||
20380731 | 1788 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1789 | { |
1790 | skb->dev = skb->dst->dev; | |
612f09e8 | 1791 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1792 | } |
1793 | ||
6723ab54 DM |
1794 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1795 | ||
9ce8ade0 TG |
1796 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1797 | { | |
612f09e8 | 1798 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1799 | } |
1800 | ||
1801 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1802 | { | |
1803 | skb->dev = skb->dst->dev; | |
612f09e8 | 1804 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1805 | } |
1806 | ||
6723ab54 DM |
1807 | #endif |
1808 | ||
1da177e4 LT |
1809 | /* |
1810 | * Allocate a dst for local (unicast / anycast) address. | |
1811 | */ | |
1812 | ||
1813 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1814 | const struct in6_addr *addr, | |
1815 | int anycast) | |
1816 | { | |
1817 | struct rt6_info *rt = ip6_dst_alloc(); | |
1818 | ||
1819 | if (rt == NULL) | |
1820 | return ERR_PTR(-ENOMEM); | |
1821 | ||
2774c7ab | 1822 | dev_hold(init_net.loopback_dev); |
1da177e4 LT |
1823 | in6_dev_hold(idev); |
1824 | ||
1825 | rt->u.dst.flags = DST_HOST; | |
1826 | rt->u.dst.input = ip6_input; | |
1827 | rt->u.dst.output = ip6_output; | |
2774c7ab | 1828 | rt->rt6i_dev = init_net.loopback_dev; |
1da177e4 LT |
1829 | rt->rt6i_idev = idev; |
1830 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1831 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1832 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1833 | rt->u.dst.obsolete = -1; | |
1834 | ||
1835 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1836 | if (anycast) |
1837 | rt->rt6i_flags |= RTF_ANYCAST; | |
1838 | else | |
1da177e4 LT |
1839 | rt->rt6i_flags |= RTF_LOCAL; |
1840 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1841 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1842 | dst_free(&rt->u.dst); |
1da177e4 LT |
1843 | return ERR_PTR(-ENOMEM); |
1844 | } | |
1845 | ||
1846 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1847 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1848 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1849 | |
1850 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1851 | ||
1852 | return rt; | |
1853 | } | |
1854 | ||
1855 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1856 | { | |
1857 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1858 | rt != &ip6_null_entry) { | |
1859 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1860 | return -1; | |
1861 | } | |
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | void rt6_ifdown(struct net_device *dev) | |
1866 | { | |
c71099ac | 1867 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1868 | } |
1869 | ||
1870 | struct rt6_mtu_change_arg | |
1871 | { | |
1872 | struct net_device *dev; | |
1873 | unsigned mtu; | |
1874 | }; | |
1875 | ||
1876 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1877 | { | |
1878 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1879 | struct inet6_dev *idev; | |
1880 | ||
1881 | /* In IPv6 pmtu discovery is not optional, | |
1882 | so that RTAX_MTU lock cannot disable it. | |
1883 | We still use this lock to block changes | |
1884 | caused by addrconf/ndisc. | |
1885 | */ | |
1886 | ||
1887 | idev = __in6_dev_get(arg->dev); | |
1888 | if (idev == NULL) | |
1889 | return 0; | |
1890 | ||
1891 | /* For administrative MTU increase, there is no way to discover | |
1892 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1893 | Since RFC 1981 doesn't include administrative MTU increase | |
1894 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1895 | */ | |
1896 | /* | |
1897 | If new MTU is less than route PMTU, this new MTU will be the | |
1898 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1899 | decreases; if new MTU is greater than route PMTU, and the | |
1900 | old MTU is the lowest MTU in the path, update the route PMTU | |
1901 | to reflect the increase. In this case if the other nodes' MTU | |
1902 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1903 | PMTU discouvery. | |
1904 | */ | |
1905 | if (rt->rt6i_dev == arg->dev && | |
1906 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1ab1457c YH |
1907 | (dst_mtu(&rt->u.dst) > arg->mtu || |
1908 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
566cfd8f | 1909 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1910 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
566cfd8f SA |
1911 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
1912 | } | |
1da177e4 LT |
1913 | return 0; |
1914 | } | |
1915 | ||
1916 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1917 | { | |
c71099ac TG |
1918 | struct rt6_mtu_change_arg arg = { |
1919 | .dev = dev, | |
1920 | .mtu = mtu, | |
1921 | }; | |
1da177e4 | 1922 | |
c71099ac | 1923 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1924 | } |
1925 | ||
ef7c79ed | 1926 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1927 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1928 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1929 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1930 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1931 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1932 | }; | |
1933 | ||
1934 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1935 | struct fib6_config *cfg) | |
1da177e4 | 1936 | { |
86872cb5 TG |
1937 | struct rtmsg *rtm; |
1938 | struct nlattr *tb[RTA_MAX+1]; | |
1939 | int err; | |
1da177e4 | 1940 | |
86872cb5 TG |
1941 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1942 | if (err < 0) | |
1943 | goto errout; | |
1da177e4 | 1944 | |
86872cb5 TG |
1945 | err = -EINVAL; |
1946 | rtm = nlmsg_data(nlh); | |
1947 | memset(cfg, 0, sizeof(*cfg)); | |
1948 | ||
1949 | cfg->fc_table = rtm->rtm_table; | |
1950 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1951 | cfg->fc_src_len = rtm->rtm_src_len; | |
1952 | cfg->fc_flags = RTF_UP; | |
1953 | cfg->fc_protocol = rtm->rtm_protocol; | |
1954 | ||
1955 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1956 | cfg->fc_flags |= RTF_REJECT; | |
1957 | ||
1958 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1959 | cfg->fc_nlinfo.nlh = nlh; | |
1960 | ||
1961 | if (tb[RTA_GATEWAY]) { | |
1962 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1963 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1964 | } |
86872cb5 TG |
1965 | |
1966 | if (tb[RTA_DST]) { | |
1967 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1968 | ||
1969 | if (nla_len(tb[RTA_DST]) < plen) | |
1970 | goto errout; | |
1971 | ||
1972 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1973 | } |
86872cb5 TG |
1974 | |
1975 | if (tb[RTA_SRC]) { | |
1976 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1977 | ||
1978 | if (nla_len(tb[RTA_SRC]) < plen) | |
1979 | goto errout; | |
1980 | ||
1981 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1982 | } |
86872cb5 TG |
1983 | |
1984 | if (tb[RTA_OIF]) | |
1985 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1986 | ||
1987 | if (tb[RTA_PRIORITY]) | |
1988 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
1989 | ||
1990 | if (tb[RTA_METRICS]) { | |
1991 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
1992 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 1993 | } |
86872cb5 TG |
1994 | |
1995 | if (tb[RTA_TABLE]) | |
1996 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
1997 | ||
1998 | err = 0; | |
1999 | errout: | |
2000 | return err; | |
1da177e4 LT |
2001 | } |
2002 | ||
c127ea2c | 2003 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2004 | { |
b854272b | 2005 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2006 | struct fib6_config cfg; |
2007 | int err; | |
1da177e4 | 2008 | |
b854272b DL |
2009 | if (net != &init_net) |
2010 | return -EINVAL; | |
2011 | ||
86872cb5 TG |
2012 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2013 | if (err < 0) | |
2014 | return err; | |
2015 | ||
2016 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2017 | } |
2018 | ||
c127ea2c | 2019 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2020 | { |
b854272b | 2021 | struct net *net = skb->sk->sk_net; |
86872cb5 TG |
2022 | struct fib6_config cfg; |
2023 | int err; | |
1da177e4 | 2024 | |
b854272b DL |
2025 | if (net != &init_net) |
2026 | return -EINVAL; | |
2027 | ||
86872cb5 TG |
2028 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2029 | if (err < 0) | |
2030 | return err; | |
2031 | ||
2032 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2033 | } |
2034 | ||
339bf98f TG |
2035 | static inline size_t rt6_nlmsg_size(void) |
2036 | { | |
2037 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2038 | + nla_total_size(16) /* RTA_SRC */ | |
2039 | + nla_total_size(16) /* RTA_DST */ | |
2040 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2041 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2042 | + nla_total_size(4) /* RTA_TABLE */ | |
2043 | + nla_total_size(4) /* RTA_IIF */ | |
2044 | + nla_total_size(4) /* RTA_OIF */ | |
2045 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2046 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2047 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2048 | } | |
2049 | ||
1da177e4 | 2050 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2051 | struct in6_addr *dst, struct in6_addr *src, |
2052 | int iif, int type, u32 pid, u32 seq, | |
2053 | int prefix, unsigned int flags) | |
1da177e4 LT |
2054 | { |
2055 | struct rtmsg *rtm; | |
2d7202bf | 2056 | struct nlmsghdr *nlh; |
e3703b3d | 2057 | long expires; |
9e762a4a | 2058 | u32 table; |
1da177e4 LT |
2059 | |
2060 | if (prefix) { /* user wants prefix routes only */ | |
2061 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2062 | /* success since this is not a prefix route */ | |
2063 | return 1; | |
2064 | } | |
2065 | } | |
2066 | ||
2d7202bf TG |
2067 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2068 | if (nlh == NULL) | |
26932566 | 2069 | return -EMSGSIZE; |
2d7202bf TG |
2070 | |
2071 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2072 | rtm->rtm_family = AF_INET6; |
2073 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2074 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2075 | rtm->rtm_tos = 0; | |
c71099ac | 2076 | if (rt->rt6i_table) |
9e762a4a | 2077 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2078 | else |
9e762a4a PM |
2079 | table = RT6_TABLE_UNSPEC; |
2080 | rtm->rtm_table = table; | |
2d7202bf | 2081 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2082 | if (rt->rt6i_flags&RTF_REJECT) |
2083 | rtm->rtm_type = RTN_UNREACHABLE; | |
2084 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2085 | rtm->rtm_type = RTN_LOCAL; | |
2086 | else | |
2087 | rtm->rtm_type = RTN_UNICAST; | |
2088 | rtm->rtm_flags = 0; | |
2089 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2090 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2091 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2092 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2093 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2094 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2095 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2096 | rtm->rtm_protocol = RTPROT_RA; | |
2097 | ||
2098 | if (rt->rt6i_flags&RTF_CACHE) | |
2099 | rtm->rtm_flags |= RTM_F_CLONED; | |
2100 | ||
2101 | if (dst) { | |
2d7202bf | 2102 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2103 | rtm->rtm_dst_len = 128; |
1da177e4 | 2104 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2105 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2106 | #ifdef CONFIG_IPV6_SUBTREES |
2107 | if (src) { | |
2d7202bf | 2108 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2109 | rtm->rtm_src_len = 128; |
1da177e4 | 2110 | } else if (rtm->rtm_src_len) |
2d7202bf | 2111 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2112 | #endif |
2113 | if (iif) | |
2d7202bf | 2114 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2115 | else if (dst) { |
2116 | struct in6_addr saddr_buf; | |
2117 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2118 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2119 | } |
2d7202bf | 2120 | |
1da177e4 | 2121 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2122 | goto nla_put_failure; |
2123 | ||
1da177e4 | 2124 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2125 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2126 | ||
1da177e4 | 2127 | if (rt->u.dst.dev) |
2d7202bf TG |
2128 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2129 | ||
2130 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2131 | |
2132 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2133 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2134 | expires, rt->u.dst.error) < 0) | |
2135 | goto nla_put_failure; | |
2d7202bf TG |
2136 | |
2137 | return nlmsg_end(skb, nlh); | |
2138 | ||
2139 | nla_put_failure: | |
26932566 PM |
2140 | nlmsg_cancel(skb, nlh); |
2141 | return -EMSGSIZE; | |
1da177e4 LT |
2142 | } |
2143 | ||
1b43af54 | 2144 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2145 | { |
2146 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2147 | int prefix; | |
2148 | ||
2d7202bf TG |
2149 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2150 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2151 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2152 | } else | |
2153 | prefix = 0; | |
2154 | ||
2155 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2156 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2157 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2158 | } |
2159 | ||
c127ea2c | 2160 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2161 | { |
b854272b | 2162 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2163 | struct nlattr *tb[RTA_MAX+1]; |
2164 | struct rt6_info *rt; | |
1da177e4 | 2165 | struct sk_buff *skb; |
ab364a6f | 2166 | struct rtmsg *rtm; |
1da177e4 | 2167 | struct flowi fl; |
ab364a6f | 2168 | int err, iif = 0; |
1da177e4 | 2169 | |
b854272b DL |
2170 | if (net != &init_net) |
2171 | return -EINVAL; | |
2172 | ||
ab364a6f TG |
2173 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2174 | if (err < 0) | |
2175 | goto errout; | |
1da177e4 | 2176 | |
ab364a6f | 2177 | err = -EINVAL; |
1da177e4 | 2178 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2179 | |
ab364a6f TG |
2180 | if (tb[RTA_SRC]) { |
2181 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2182 | goto errout; | |
2183 | ||
2184 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2185 | } | |
2186 | ||
2187 | if (tb[RTA_DST]) { | |
2188 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2189 | goto errout; | |
2190 | ||
2191 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2192 | } | |
2193 | ||
2194 | if (tb[RTA_IIF]) | |
2195 | iif = nla_get_u32(tb[RTA_IIF]); | |
2196 | ||
2197 | if (tb[RTA_OIF]) | |
2198 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2199 | |
2200 | if (iif) { | |
2201 | struct net_device *dev; | |
881d966b | 2202 | dev = __dev_get_by_index(&init_net, iif); |
1da177e4 LT |
2203 | if (!dev) { |
2204 | err = -ENODEV; | |
ab364a6f | 2205 | goto errout; |
1da177e4 LT |
2206 | } |
2207 | } | |
2208 | ||
ab364a6f TG |
2209 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2210 | if (skb == NULL) { | |
2211 | err = -ENOBUFS; | |
2212 | goto errout; | |
2213 | } | |
1da177e4 | 2214 | |
ab364a6f TG |
2215 | /* Reserve room for dummy headers, this skb can pass |
2216 | through good chunk of routing engine. | |
2217 | */ | |
459a98ed | 2218 | skb_reset_mac_header(skb); |
ab364a6f | 2219 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2220 | |
ab364a6f | 2221 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2222 | skb->dst = &rt->u.dst; |
2223 | ||
ab364a6f | 2224 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2225 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2226 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2227 | if (err < 0) { |
ab364a6f TG |
2228 | kfree_skb(skb); |
2229 | goto errout; | |
1da177e4 LT |
2230 | } |
2231 | ||
97c53cac | 2232 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2233 | errout: |
1da177e4 | 2234 | return err; |
1da177e4 LT |
2235 | } |
2236 | ||
86872cb5 | 2237 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2238 | { |
2239 | struct sk_buff *skb; | |
528c4ceb DL |
2240 | u32 seq; |
2241 | int err; | |
2242 | ||
2243 | err = -ENOBUFS; | |
2244 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2245 | |
339bf98f | 2246 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2247 | if (skb == NULL) |
2248 | goto errout; | |
2249 | ||
528c4ceb DL |
2250 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2251 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2252 | if (err < 0) { |
2253 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2254 | WARN_ON(err == -EMSGSIZE); | |
2255 | kfree_skb(skb); | |
2256 | goto errout; | |
2257 | } | |
528c4ceb DL |
2258 | err = rtnl_notify(skb, &init_net, info->pid, |
2259 | RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any()); | |
21713ebc TG |
2260 | errout: |
2261 | if (err < 0) | |
97c53cac | 2262 | rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2263 | } |
2264 | ||
2265 | /* | |
2266 | * /proc | |
2267 | */ | |
2268 | ||
2269 | #ifdef CONFIG_PROC_FS | |
2270 | ||
2271 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2272 | ||
2273 | struct rt6_proc_arg | |
2274 | { | |
2275 | char *buffer; | |
2276 | int offset; | |
2277 | int length; | |
2278 | int skip; | |
2279 | int len; | |
2280 | }; | |
2281 | ||
2282 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2283 | { | |
33120b30 | 2284 | struct seq_file *m = p_arg; |
1da177e4 | 2285 | |
33120b30 AD |
2286 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2287 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2288 | |
2289 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2290 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2291 | rt->rt6i_src.plen); | |
1da177e4 | 2292 | #else |
33120b30 | 2293 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2294 | #endif |
2295 | ||
2296 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2297 | seq_printf(m, NIP6_SEQFMT, |
2298 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2299 | } else { |
33120b30 | 2300 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2301 | } |
33120b30 AD |
2302 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2303 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2304 | rt->u.dst.__use, rt->rt6i_flags, | |
2305 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2306 | return 0; |
2307 | } | |
2308 | ||
33120b30 | 2309 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2310 | { |
33120b30 AD |
2311 | fib6_clean_all(rt6_info_route, 0, m); |
2312 | return 0; | |
2313 | } | |
1da177e4 | 2314 | |
33120b30 AD |
2315 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2316 | { | |
2317 | return single_open(file, ipv6_route_show, NULL); | |
1da177e4 LT |
2318 | } |
2319 | ||
33120b30 AD |
2320 | static const struct file_operations ipv6_route_proc_fops = { |
2321 | .owner = THIS_MODULE, | |
2322 | .open = ipv6_route_open, | |
2323 | .read = seq_read, | |
2324 | .llseek = seq_lseek, | |
2325 | .release = single_release, | |
2326 | }; | |
2327 | ||
1da177e4 LT |
2328 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2329 | { | |
2330 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2331 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2332 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2333 | rt6_stats.fib_rt_cache, | |
2334 | atomic_read(&ip6_dst_ops.entries), | |
2335 | rt6_stats.fib_discarded_routes); | |
2336 | ||
2337 | return 0; | |
2338 | } | |
2339 | ||
2340 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2341 | { | |
2342 | return single_open(file, rt6_stats_seq_show, NULL); | |
2343 | } | |
2344 | ||
9a32144e | 2345 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2346 | .owner = THIS_MODULE, |
2347 | .open = rt6_stats_seq_open, | |
2348 | .read = seq_read, | |
2349 | .llseek = seq_lseek, | |
2350 | .release = single_release, | |
2351 | }; | |
75314fb3 DL |
2352 | |
2353 | static int ipv6_route_proc_init(struct net *net) | |
2354 | { | |
2355 | int ret = -ENOMEM; | |
2356 | if (!proc_net_fops_create(net, "ipv6_route", | |
2357 | 0, &ipv6_route_proc_fops)) | |
2358 | goto out; | |
2359 | ||
2360 | if (!proc_net_fops_create(net, "rt6_stats", | |
2361 | S_IRUGO, &rt6_stats_seq_fops)) | |
2362 | goto out_ipv6_route; | |
2363 | ||
2364 | ret = 0; | |
2365 | out: | |
2366 | return ret; | |
2367 | out_ipv6_route: | |
2368 | proc_net_remove(net, "ipv6_route"); | |
2369 | goto out; | |
2370 | } | |
2371 | ||
2372 | static void ipv6_route_proc_fini(struct net *net) | |
2373 | { | |
2374 | proc_net_remove(net, "ipv6_route"); | |
2375 | proc_net_remove(net, "rt6_stats"); | |
2376 | } | |
2377 | #else | |
2378 | static inline int ipv6_route_proc_init(struct net *net) | |
2379 | { | |
2380 | return 0; | |
2381 | } | |
2382 | static inline void ipv6_route_proc_fini(struct net *net) | |
2383 | { | |
2384 | return ; | |
2385 | } | |
1da177e4 LT |
2386 | #endif /* CONFIG_PROC_FS */ |
2387 | ||
2388 | #ifdef CONFIG_SYSCTL | |
2389 | ||
1da177e4 LT |
2390 | static |
2391 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2392 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2393 | { | |
4990509f | 2394 | int delay = init_net.ipv6.sysctl.flush_delay; |
1da177e4 LT |
2395 | if (write) { |
2396 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
4990509f | 2397 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay); |
1da177e4 LT |
2398 | return 0; |
2399 | } else | |
2400 | return -EINVAL; | |
2401 | } | |
2402 | ||
760f2d01 | 2403 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2404 | { |
1da177e4 | 2405 | .procname = "flush", |
4990509f | 2406 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2407 | .maxlen = sizeof(int), |
89c8b3a1 | 2408 | .mode = 0200, |
1ab1457c | 2409 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2410 | }, |
2411 | { | |
2412 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2413 | .procname = "gc_thresh", | |
1ab1457c | 2414 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2415 | .maxlen = sizeof(int), |
2416 | .mode = 0644, | |
1ab1457c | 2417 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2418 | }, |
2419 | { | |
2420 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2421 | .procname = "max_size", | |
4990509f | 2422 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2423 | .maxlen = sizeof(int), |
2424 | .mode = 0644, | |
1ab1457c | 2425 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2426 | }, |
2427 | { | |
2428 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2429 | .procname = "gc_min_interval", | |
4990509f | 2430 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2431 | .maxlen = sizeof(int), |
2432 | .mode = 0644, | |
1ab1457c | 2433 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2434 | .strategy = &sysctl_jiffies, |
2435 | }, | |
2436 | { | |
2437 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2438 | .procname = "gc_timeout", | |
4990509f | 2439 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2440 | .maxlen = sizeof(int), |
2441 | .mode = 0644, | |
1ab1457c | 2442 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2443 | .strategy = &sysctl_jiffies, |
2444 | }, | |
2445 | { | |
2446 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2447 | .procname = "gc_interval", | |
4990509f | 2448 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2449 | .maxlen = sizeof(int), |
2450 | .mode = 0644, | |
1ab1457c | 2451 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2452 | .strategy = &sysctl_jiffies, |
2453 | }, | |
2454 | { | |
2455 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2456 | .procname = "gc_elasticity", | |
4990509f | 2457 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2458 | .maxlen = sizeof(int), |
2459 | .mode = 0644, | |
1ab1457c | 2460 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2461 | .strategy = &sysctl_jiffies, |
2462 | }, | |
2463 | { | |
2464 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2465 | .procname = "mtu_expires", | |
4990509f | 2466 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2467 | .maxlen = sizeof(int), |
2468 | .mode = 0644, | |
1ab1457c | 2469 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2470 | .strategy = &sysctl_jiffies, |
2471 | }, | |
2472 | { | |
2473 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2474 | .procname = "min_adv_mss", | |
4990509f | 2475 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2476 | .maxlen = sizeof(int), |
2477 | .mode = 0644, | |
1ab1457c | 2478 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2479 | .strategy = &sysctl_jiffies, |
2480 | }, | |
2481 | { | |
2482 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2483 | .procname = "gc_min_interval_ms", | |
4990509f | 2484 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2485 | .maxlen = sizeof(int), |
2486 | .mode = 0644, | |
1ab1457c | 2487 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2488 | .strategy = &sysctl_ms_jiffies, |
2489 | }, | |
2490 | { .ctl_name = 0 } | |
2491 | }; | |
2492 | ||
760f2d01 DL |
2493 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2494 | { | |
2495 | struct ctl_table *table; | |
2496 | ||
2497 | table = kmemdup(ipv6_route_table_template, | |
2498 | sizeof(ipv6_route_table_template), | |
2499 | GFP_KERNEL); | |
2500 | return table; | |
2501 | } | |
1da177e4 LT |
2502 | #endif |
2503 | ||
433d49c3 | 2504 | int __init ip6_route_init(void) |
1da177e4 | 2505 | { |
433d49c3 DL |
2506 | int ret; |
2507 | ||
e5d679f3 AD |
2508 | ip6_dst_ops.kmem_cachep = |
2509 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
f845ab6b DL |
2510 | SLAB_HWCACHE_ALIGN, NULL); |
2511 | if (!ip6_dst_ops.kmem_cachep) | |
2512 | return -ENOMEM; | |
2513 | ||
14e50e57 DM |
2514 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2515 | ||
433d49c3 DL |
2516 | ret = fib6_init(); |
2517 | if (ret) | |
2518 | goto out_kmem_cache; | |
2519 | ||
75314fb3 DL |
2520 | ret = ipv6_route_proc_init(&init_net); |
2521 | if (ret) | |
433d49c3 DL |
2522 | goto out_fib6_init; |
2523 | ||
433d49c3 DL |
2524 | ret = xfrm6_init(); |
2525 | if (ret) | |
75314fb3 | 2526 | goto out_proc_init; |
c35b7e72 | 2527 | |
433d49c3 DL |
2528 | ret = fib6_rules_init(); |
2529 | if (ret) | |
2530 | goto xfrm6_init; | |
7e5449c2 | 2531 | |
433d49c3 DL |
2532 | ret = -ENOBUFS; |
2533 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2534 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2535 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2536 | goto fib6_rules_init; | |
c127ea2c | 2537 | |
433d49c3 DL |
2538 | ret = 0; |
2539 | out: | |
2540 | return ret; | |
2541 | ||
2542 | fib6_rules_init: | |
433d49c3 DL |
2543 | fib6_rules_cleanup(); |
2544 | xfrm6_init: | |
433d49c3 | 2545 | xfrm6_fini(); |
75314fb3 DL |
2546 | out_proc_init: |
2547 | ipv6_route_proc_fini(&init_net); | |
433d49c3 | 2548 | out_fib6_init: |
433d49c3 DL |
2549 | rt6_ifdown(NULL); |
2550 | fib6_gc_cleanup(); | |
2551 | out_kmem_cache: | |
2552 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2553 | goto out; | |
1da177e4 LT |
2554 | } |
2555 | ||
2556 | void ip6_route_cleanup(void) | |
2557 | { | |
101367c2 | 2558 | fib6_rules_cleanup(); |
75314fb3 | 2559 | ipv6_route_proc_fini(&init_net); |
1da177e4 | 2560 | xfrm6_fini(); |
1da177e4 LT |
2561 | rt6_ifdown(NULL); |
2562 | fib6_gc_cleanup(); | |
2563 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2564 | } |