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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> | |
5b7c931d | 43 | #include <linux/nsproxy.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
519fbd87 | 75 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 76 | |
1da177e4 LT |
77 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
78 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
89 | ||
70ceb4f5 | 90 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
91 | static struct rt6_info *rt6_add_route_info(struct net *net, |
92 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
93 | struct in6_addr *gwaddr, int ifindex, |
94 | unsigned pref); | |
efa2cea0 DL |
95 | static struct rt6_info *rt6_get_route_info(struct net *net, |
96 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
97 | struct in6_addr *gwaddr, int ifindex); |
98 | #endif | |
99 | ||
1da177e4 LT |
100 | static struct dst_ops ip6_dst_ops = { |
101 | .family = AF_INET6, | |
102 | .protocol = __constant_htons(ETH_P_IPV6), | |
103 | .gc = ip6_dst_gc, | |
104 | .gc_thresh = 1024, | |
105 | .check = ip6_dst_check, | |
106 | .destroy = ip6_dst_destroy, | |
107 | .ifdown = ip6_dst_ifdown, | |
108 | .negative_advice = ip6_negative_advice, | |
109 | .link_failure = ip6_link_failure, | |
110 | .update_pmtu = ip6_rt_update_pmtu, | |
862b82c6 | 111 | .local_out = ip6_local_out, |
1da177e4 | 112 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 113 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
114 | }; |
115 | ||
14e50e57 DM |
116 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
117 | { | |
118 | } | |
119 | ||
120 | static struct dst_ops ip6_dst_blackhole_ops = { | |
121 | .family = AF_INET6, | |
122 | .protocol = __constant_htons(ETH_P_IPV6), | |
123 | .destroy = ip6_dst_destroy, | |
124 | .check = ip6_dst_check, | |
125 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
126 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 127 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
128 | }; |
129 | ||
bdb3289f | 130 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
131 | .u = { |
132 | .dst = { | |
133 | .__refcnt = ATOMIC_INIT(1), | |
134 | .__use = 1, | |
1da177e4 LT |
135 | .obsolete = -1, |
136 | .error = -ENETUNREACH, | |
137 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
138 | .input = ip6_pkt_discard, | |
139 | .output = ip6_pkt_discard_out, | |
140 | .ops = &ip6_dst_ops, | |
1da177e4 LT |
141 | } |
142 | }, | |
143 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
144 | .rt6i_metric = ~(u32) 0, | |
145 | .rt6i_ref = ATOMIC_INIT(1), | |
146 | }; | |
147 | ||
101367c2 TG |
148 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
149 | ||
6723ab54 DM |
150 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
151 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 152 | |
bdb3289f | 153 | struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
154 | .u = { |
155 | .dst = { | |
156 | .__refcnt = ATOMIC_INIT(1), | |
157 | .__use = 1, | |
101367c2 TG |
158 | .obsolete = -1, |
159 | .error = -EACCES, | |
160 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
161 | .input = ip6_pkt_prohibit, |
162 | .output = ip6_pkt_prohibit_out, | |
101367c2 | 163 | .ops = &ip6_dst_ops, |
101367c2 TG |
164 | } |
165 | }, | |
166 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
167 | .rt6i_metric = ~(u32) 0, | |
168 | .rt6i_ref = ATOMIC_INIT(1), | |
169 | }; | |
170 | ||
bdb3289f | 171 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
172 | .u = { |
173 | .dst = { | |
174 | .__refcnt = ATOMIC_INIT(1), | |
175 | .__use = 1, | |
101367c2 TG |
176 | .obsolete = -1, |
177 | .error = -EINVAL, | |
178 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
179 | .input = dst_discard, |
180 | .output = dst_discard, | |
101367c2 | 181 | .ops = &ip6_dst_ops, |
101367c2 TG |
182 | } |
183 | }, | |
184 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
185 | .rt6i_metric = ~(u32) 0, | |
186 | .rt6i_ref = ATOMIC_INIT(1), | |
187 | }; | |
188 | ||
189 | #endif | |
190 | ||
1da177e4 LT |
191 | /* allocate dst with ip6_dst_ops */ |
192 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
193 | { | |
194 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
195 | } | |
196 | ||
197 | static void ip6_dst_destroy(struct dst_entry *dst) | |
198 | { | |
199 | struct rt6_info *rt = (struct rt6_info *)dst; | |
200 | struct inet6_dev *idev = rt->rt6i_idev; | |
201 | ||
202 | if (idev != NULL) { | |
203 | rt->rt6i_idev = NULL; | |
204 | in6_dev_put(idev); | |
1ab1457c | 205 | } |
1da177e4 LT |
206 | } |
207 | ||
208 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
209 | int how) | |
210 | { | |
211 | struct rt6_info *rt = (struct rt6_info *)dst; | |
212 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
213 | struct net_device *loopback_dev = |
214 | dev->nd_net->loopback_dev; | |
1da177e4 | 215 | |
5a3e55d6 DL |
216 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
217 | struct inet6_dev *loopback_idev = | |
218 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
219 | if (loopback_idev != NULL) { |
220 | rt->rt6i_idev = loopback_idev; | |
221 | in6_dev_put(idev); | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
226 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
227 | { | |
228 | return (rt->rt6i_flags & RTF_EXPIRES && | |
229 | time_after(jiffies, rt->rt6i_expires)); | |
230 | } | |
231 | ||
c71099ac TG |
232 | static inline int rt6_need_strict(struct in6_addr *daddr) |
233 | { | |
234 | return (ipv6_addr_type(daddr) & | |
235 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
236 | } | |
237 | ||
1da177e4 | 238 | /* |
c71099ac | 239 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
240 | */ |
241 | ||
8ed67789 DL |
242 | static inline struct rt6_info *rt6_device_match(struct net *net, |
243 | struct rt6_info *rt, | |
1da177e4 LT |
244 | int oif, |
245 | int strict) | |
246 | { | |
247 | struct rt6_info *local = NULL; | |
248 | struct rt6_info *sprt; | |
249 | ||
250 | if (oif) { | |
7cc48263 | 251 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
252 | struct net_device *dev = sprt->rt6i_dev; |
253 | if (dev->ifindex == oif) | |
254 | return sprt; | |
255 | if (dev->flags & IFF_LOOPBACK) { | |
256 | if (sprt->rt6i_idev == NULL || | |
257 | sprt->rt6i_idev->dev->ifindex != oif) { | |
258 | if (strict && oif) | |
259 | continue; | |
1ab1457c | 260 | if (local && (!oif || |
1da177e4 LT |
261 | local->rt6i_idev->dev->ifindex == oif)) |
262 | continue; | |
263 | } | |
264 | local = sprt; | |
265 | } | |
266 | } | |
267 | ||
268 | if (local) | |
269 | return local; | |
270 | ||
271 | if (strict) | |
8ed67789 | 272 | return net->ipv6.ip6_null_entry; |
1da177e4 LT |
273 | } |
274 | return rt; | |
275 | } | |
276 | ||
27097255 YH |
277 | #ifdef CONFIG_IPV6_ROUTER_PREF |
278 | static void rt6_probe(struct rt6_info *rt) | |
279 | { | |
280 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
281 | /* | |
282 | * Okay, this does not seem to be appropriate | |
283 | * for now, however, we need to check if it | |
284 | * is really so; aka Router Reachability Probing. | |
285 | * | |
286 | * Router Reachability Probe MUST be rate-limited | |
287 | * to no more than one per minute. | |
288 | */ | |
289 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
290 | return; | |
291 | read_lock_bh(&neigh->lock); | |
292 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 293 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
294 | struct in6_addr mcaddr; |
295 | struct in6_addr *target; | |
296 | ||
297 | neigh->updated = jiffies; | |
298 | read_unlock_bh(&neigh->lock); | |
299 | ||
300 | target = (struct in6_addr *)&neigh->primary_key; | |
301 | addrconf_addr_solict_mult(target, &mcaddr); | |
302 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
303 | } else | |
304 | read_unlock_bh(&neigh->lock); | |
305 | } | |
306 | #else | |
307 | static inline void rt6_probe(struct rt6_info *rt) | |
308 | { | |
309 | return; | |
310 | } | |
311 | #endif | |
312 | ||
1da177e4 | 313 | /* |
554cfb7e | 314 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 315 | */ |
b6f99a21 | 316 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
317 | { |
318 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 319 | if (!oif || dev->ifindex == oif) |
554cfb7e | 320 | return 2; |
161980f4 DM |
321 | if ((dev->flags & IFF_LOOPBACK) && |
322 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
323 | return 1; | |
324 | return 0; | |
554cfb7e | 325 | } |
1da177e4 | 326 | |
b6f99a21 | 327 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 328 | { |
554cfb7e | 329 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 330 | int m; |
4d0c5911 YH |
331 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
332 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
333 | m = 1; | |
334 | else if (neigh) { | |
554cfb7e YH |
335 | read_lock_bh(&neigh->lock); |
336 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 337 | m = 2; |
398bcbeb YH |
338 | #ifdef CONFIG_IPV6_ROUTER_PREF |
339 | else if (neigh->nud_state & NUD_FAILED) | |
340 | m = 0; | |
341 | #endif | |
342 | else | |
ea73ee23 | 343 | m = 1; |
554cfb7e | 344 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
345 | } else |
346 | m = 0; | |
554cfb7e | 347 | return m; |
1da177e4 LT |
348 | } |
349 | ||
554cfb7e YH |
350 | static int rt6_score_route(struct rt6_info *rt, int oif, |
351 | int strict) | |
1da177e4 | 352 | { |
4d0c5911 | 353 | int m, n; |
1ab1457c | 354 | |
4d0c5911 | 355 | m = rt6_check_dev(rt, oif); |
77d16f45 | 356 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 357 | return -1; |
ebacaaa0 YH |
358 | #ifdef CONFIG_IPV6_ROUTER_PREF |
359 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
360 | #endif | |
4d0c5911 | 361 | n = rt6_check_neigh(rt); |
557e92ef | 362 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
363 | return -1; |
364 | return m; | |
365 | } | |
366 | ||
f11e6659 DM |
367 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
368 | int *mpri, struct rt6_info *match) | |
554cfb7e | 369 | { |
f11e6659 DM |
370 | int m; |
371 | ||
372 | if (rt6_check_expired(rt)) | |
373 | goto out; | |
374 | ||
375 | m = rt6_score_route(rt, oif, strict); | |
376 | if (m < 0) | |
377 | goto out; | |
378 | ||
379 | if (m > *mpri) { | |
380 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
381 | rt6_probe(match); | |
382 | *mpri = m; | |
383 | match = rt; | |
384 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
385 | rt6_probe(rt); | |
386 | } | |
387 | ||
388 | out: | |
389 | return match; | |
390 | } | |
391 | ||
392 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
393 | struct rt6_info *rr_head, | |
394 | u32 metric, int oif, int strict) | |
395 | { | |
396 | struct rt6_info *rt, *match; | |
554cfb7e | 397 | int mpri = -1; |
1da177e4 | 398 | |
f11e6659 DM |
399 | match = NULL; |
400 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
401 | rt = rt->u.dst.rt6_next) | |
402 | match = find_match(rt, oif, strict, &mpri, match); | |
403 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
404 | rt = rt->u.dst.rt6_next) | |
405 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 406 | |
f11e6659 DM |
407 | return match; |
408 | } | |
1da177e4 | 409 | |
f11e6659 DM |
410 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
411 | { | |
412 | struct rt6_info *match, *rt0; | |
8ed67789 | 413 | struct net *net; |
1da177e4 | 414 | |
f11e6659 DM |
415 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
416 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 417 | |
f11e6659 DM |
418 | rt0 = fn->rr_ptr; |
419 | if (!rt0) | |
420 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 421 | |
f11e6659 | 422 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 423 | |
554cfb7e | 424 | if (!match && |
f11e6659 DM |
425 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
426 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
427 | ||
554cfb7e | 428 | /* no entries matched; do round-robin */ |
f11e6659 DM |
429 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
430 | next = fn->leaf; | |
431 | ||
432 | if (next != rt0) | |
433 | fn->rr_ptr = next; | |
1da177e4 | 434 | } |
1da177e4 | 435 | |
f11e6659 DM |
436 | RT6_TRACE("%s() => %p\n", |
437 | __FUNCTION__, match); | |
1da177e4 | 438 | |
8ed67789 DL |
439 | net = rt0->rt6i_dev->nd_net; |
440 | return (match ? match : net->ipv6.ip6_null_entry); | |
1da177e4 LT |
441 | } |
442 | ||
70ceb4f5 YH |
443 | #ifdef CONFIG_IPV6_ROUTE_INFO |
444 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
445 | struct in6_addr *gwaddr) | |
446 | { | |
efa2cea0 | 447 | struct net *net = dev->nd_net; |
70ceb4f5 YH |
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 | ||
efa2cea0 DL |
495 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
496 | dev->ifindex); | |
70ceb4f5 YH |
497 | |
498 | if (rt && !lifetime) { | |
e0a1ad73 | 499 | ip6_del_rt(rt); |
70ceb4f5 YH |
500 | rt = NULL; |
501 | } | |
502 | ||
503 | if (!rt && lifetime) | |
efa2cea0 | 504 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
505 | pref); |
506 | else if (rt) | |
507 | rt->rt6i_flags = RTF_ROUTEINFO | | |
508 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
509 | ||
510 | if (rt) { | |
511 | if (lifetime == 0xffffffff) { | |
512 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
513 | } else { | |
514 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
515 | rt->rt6i_flags |= RTF_EXPIRES; | |
516 | } | |
517 | dst_release(&rt->u.dst); | |
518 | } | |
519 | return 0; | |
520 | } | |
521 | #endif | |
522 | ||
8ed67789 | 523 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 524 | do { \ |
8ed67789 | 525 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 526 | struct fib6_node *pn; \ |
e0eda7bb | 527 | while (1) { \ |
982f56f3 YH |
528 | if (fn->fn_flags & RTN_TL_ROOT) \ |
529 | goto out; \ | |
530 | pn = fn->parent; \ | |
531 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 532 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
533 | else \ |
534 | fn = pn; \ | |
535 | if (fn->fn_flags & RTN_RTINFO) \ | |
536 | goto restart; \ | |
c71099ac | 537 | } \ |
c71099ac | 538 | } \ |
982f56f3 | 539 | } while(0) |
c71099ac | 540 | |
8ed67789 DL |
541 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
542 | struct fib6_table *table, | |
c71099ac | 543 | struct flowi *fl, int flags) |
1da177e4 LT |
544 | { |
545 | struct fib6_node *fn; | |
546 | struct rt6_info *rt; | |
547 | ||
c71099ac TG |
548 | read_lock_bh(&table->tb6_lock); |
549 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
550 | restart: | |
551 | rt = fn->leaf; | |
8ed67789 DL |
552 | rt = rt6_device_match(net, rt, fl->oif, flags); |
553 | BACKTRACK(net, &fl->fl6_src); | |
c71099ac | 554 | out: |
03f49f34 | 555 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 556 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
557 | return rt; |
558 | ||
559 | } | |
560 | ||
606a2b48 DL |
561 | struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr, |
562 | struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
563 | { |
564 | struct flowi fl = { | |
565 | .oif = oif, | |
566 | .nl_u = { | |
567 | .ip6_u = { | |
568 | .daddr = *daddr, | |
c71099ac TG |
569 | }, |
570 | }, | |
571 | }; | |
572 | struct dst_entry *dst; | |
77d16f45 | 573 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 574 | |
adaa70bb TG |
575 | if (saddr) { |
576 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
577 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
578 | } | |
579 | ||
606a2b48 | 580 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
581 | if (dst->error == 0) |
582 | return (struct rt6_info *) dst; | |
583 | ||
584 | dst_release(dst); | |
585 | ||
1da177e4 LT |
586 | return NULL; |
587 | } | |
588 | ||
7159039a YH |
589 | EXPORT_SYMBOL(rt6_lookup); |
590 | ||
c71099ac | 591 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
592 | It takes new route entry, the addition fails by any reason the |
593 | route is freed. In any case, if caller does not hold it, it may | |
594 | be destroyed. | |
595 | */ | |
596 | ||
86872cb5 | 597 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
598 | { |
599 | int err; | |
c71099ac | 600 | struct fib6_table *table; |
1da177e4 | 601 | |
c71099ac TG |
602 | table = rt->rt6i_table; |
603 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 604 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 605 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
606 | |
607 | return err; | |
608 | } | |
609 | ||
40e22e8f TG |
610 | int ip6_ins_rt(struct rt6_info *rt) |
611 | { | |
4d1169c1 | 612 | struct nl_info info = { |
5578689a | 613 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 614 | }; |
528c4ceb | 615 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
616 | } |
617 | ||
95a9a5ba YH |
618 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
619 | struct in6_addr *saddr) | |
1da177e4 | 620 | { |
1da177e4 LT |
621 | struct rt6_info *rt; |
622 | ||
623 | /* | |
624 | * Clone the route. | |
625 | */ | |
626 | ||
627 | rt = ip6_rt_copy(ort); | |
628 | ||
629 | if (rt) { | |
58c4fb86 YH |
630 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
631 | if (rt->rt6i_dst.plen != 128 && | |
632 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
633 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 634 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 635 | } |
1da177e4 | 636 | |
58c4fb86 | 637 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
638 | rt->rt6i_dst.plen = 128; |
639 | rt->rt6i_flags |= RTF_CACHE; | |
640 | rt->u.dst.flags |= DST_HOST; | |
641 | ||
642 | #ifdef CONFIG_IPV6_SUBTREES | |
643 | if (rt->rt6i_src.plen && saddr) { | |
644 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
645 | rt->rt6i_src.plen = 128; | |
646 | } | |
647 | #endif | |
648 | ||
649 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
650 | ||
95a9a5ba | 651 | } |
1da177e4 | 652 | |
95a9a5ba YH |
653 | return rt; |
654 | } | |
1da177e4 | 655 | |
299d9939 YH |
656 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
657 | { | |
658 | struct rt6_info *rt = ip6_rt_copy(ort); | |
659 | if (rt) { | |
660 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
661 | rt->rt6i_dst.plen = 128; | |
662 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
663 | rt->u.dst.flags |= DST_HOST; |
664 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
665 | } | |
666 | return rt; | |
667 | } | |
668 | ||
8ed67789 DL |
669 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
670 | struct flowi *fl, int flags) | |
1da177e4 LT |
671 | { |
672 | struct fib6_node *fn; | |
519fbd87 | 673 | struct rt6_info *rt, *nrt; |
c71099ac | 674 | int strict = 0; |
1da177e4 | 675 | int attempts = 3; |
519fbd87 | 676 | int err; |
ea659e07 | 677 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 678 | |
77d16f45 | 679 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
680 | |
681 | relookup: | |
c71099ac | 682 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 683 | |
8238dd06 | 684 | restart_2: |
c71099ac | 685 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
686 | |
687 | restart: | |
4acad72d | 688 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
689 | |
690 | BACKTRACK(net, &fl->fl6_src); | |
691 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 692 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 693 | goto out; |
1da177e4 | 694 | |
fb9de91e | 695 | dst_hold(&rt->u.dst); |
c71099ac | 696 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 697 | |
519fbd87 | 698 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 699 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
700 | else { |
701 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 702 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
703 | #else |
704 | goto out2; | |
705 | #endif | |
706 | } | |
e40cf353 | 707 | |
519fbd87 | 708 | dst_release(&rt->u.dst); |
8ed67789 | 709 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 710 | |
519fbd87 YH |
711 | dst_hold(&rt->u.dst); |
712 | if (nrt) { | |
40e22e8f | 713 | err = ip6_ins_rt(nrt); |
519fbd87 | 714 | if (!err) |
1da177e4 | 715 | goto out2; |
1da177e4 | 716 | } |
1da177e4 | 717 | |
519fbd87 YH |
718 | if (--attempts <= 0) |
719 | goto out2; | |
720 | ||
721 | /* | |
c71099ac | 722 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
723 | * released someone could insert this route. Relookup. |
724 | */ | |
725 | dst_release(&rt->u.dst); | |
726 | goto relookup; | |
727 | ||
728 | out: | |
8238dd06 YH |
729 | if (reachable) { |
730 | reachable = 0; | |
731 | goto restart_2; | |
732 | } | |
519fbd87 | 733 | dst_hold(&rt->u.dst); |
c71099ac | 734 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
735 | out2: |
736 | rt->u.dst.lastuse = jiffies; | |
737 | rt->u.dst.__use++; | |
c71099ac TG |
738 | |
739 | return rt; | |
1da177e4 LT |
740 | } |
741 | ||
8ed67789 | 742 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
743 | struct flowi *fl, int flags) |
744 | { | |
8ed67789 | 745 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
746 | } |
747 | ||
c71099ac TG |
748 | void ip6_route_input(struct sk_buff *skb) |
749 | { | |
0660e03f | 750 | struct ipv6hdr *iph = ipv6_hdr(skb); |
5578689a | 751 | struct net *net = skb->dev->nd_net; |
adaa70bb | 752 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
753 | struct flowi fl = { |
754 | .iif = skb->dev->ifindex, | |
755 | .nl_u = { | |
756 | .ip6_u = { | |
757 | .daddr = iph->daddr, | |
758 | .saddr = iph->saddr, | |
90bcaf7b | 759 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
760 | }, |
761 | }, | |
1ab1457c | 762 | .mark = skb->mark, |
c71099ac TG |
763 | .proto = iph->nexthdr, |
764 | }; | |
adaa70bb TG |
765 | |
766 | if (rt6_need_strict(&iph->daddr)) | |
767 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 768 | |
5578689a | 769 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
770 | } |
771 | ||
8ed67789 | 772 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 773 | struct flowi *fl, int flags) |
1da177e4 | 774 | { |
8ed67789 | 775 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
776 | } |
777 | ||
778 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
779 | { | |
780 | int flags = 0; | |
781 | ||
782 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 783 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 784 | |
adaa70bb TG |
785 | if (!ipv6_addr_any(&fl->fl6_src)) |
786 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
787 | ||
58f09b78 | 788 | return fib6_rule_lookup(&init_net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
789 | } |
790 | ||
7159039a | 791 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 792 | |
14e50e57 DM |
793 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
794 | { | |
795 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
796 | struct rt6_info *rt = (struct rt6_info *) | |
797 | dst_alloc(&ip6_dst_blackhole_ops); | |
798 | struct dst_entry *new = NULL; | |
799 | ||
800 | if (rt) { | |
801 | new = &rt->u.dst; | |
802 | ||
803 | atomic_set(&new->__refcnt, 1); | |
804 | new->__use = 1; | |
352e512c HX |
805 | new->input = dst_discard; |
806 | new->output = dst_discard; | |
14e50e57 DM |
807 | |
808 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
809 | new->dev = ort->u.dst.dev; | |
810 | if (new->dev) | |
811 | dev_hold(new->dev); | |
812 | rt->rt6i_idev = ort->rt6i_idev; | |
813 | if (rt->rt6i_idev) | |
814 | in6_dev_hold(rt->rt6i_idev); | |
815 | rt->rt6i_expires = 0; | |
816 | ||
817 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
818 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
819 | rt->rt6i_metric = 0; | |
820 | ||
821 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
822 | #ifdef CONFIG_IPV6_SUBTREES | |
823 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
824 | #endif | |
825 | ||
826 | dst_free(new); | |
827 | } | |
828 | ||
829 | dst_release(*dstp); | |
830 | *dstp = new; | |
831 | return (new ? 0 : -ENOMEM); | |
832 | } | |
833 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
834 | ||
1da177e4 LT |
835 | /* |
836 | * Destination cache support functions | |
837 | */ | |
838 | ||
839 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
840 | { | |
841 | struct rt6_info *rt; | |
842 | ||
843 | rt = (struct rt6_info *) dst; | |
844 | ||
845 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
846 | return dst; | |
847 | ||
848 | return NULL; | |
849 | } | |
850 | ||
851 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
852 | { | |
853 | struct rt6_info *rt = (struct rt6_info *) dst; | |
854 | ||
855 | if (rt) { | |
856 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 857 | ip6_del_rt(rt); |
1da177e4 LT |
858 | else |
859 | dst_release(dst); | |
860 | } | |
861 | return NULL; | |
862 | } | |
863 | ||
864 | static void ip6_link_failure(struct sk_buff *skb) | |
865 | { | |
866 | struct rt6_info *rt; | |
867 | ||
868 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
869 | ||
870 | rt = (struct rt6_info *) skb->dst; | |
871 | if (rt) { | |
872 | if (rt->rt6i_flags&RTF_CACHE) { | |
873 | dst_set_expires(&rt->u.dst, 0); | |
874 | rt->rt6i_flags |= RTF_EXPIRES; | |
875 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
876 | rt->rt6i_node->fn_sernum = -1; | |
877 | } | |
878 | } | |
879 | ||
880 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
881 | { | |
882 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
883 | ||
884 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
885 | rt6->rt6i_flags |= RTF_MODIFIED; | |
886 | if (mtu < IPV6_MIN_MTU) { | |
887 | mtu = IPV6_MIN_MTU; | |
888 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
889 | } | |
890 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 891 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
892 | } |
893 | } | |
894 | ||
1da177e4 LT |
895 | static int ipv6_get_mtu(struct net_device *dev); |
896 | ||
5578689a | 897 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
898 | { |
899 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
900 | ||
5578689a DL |
901 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
902 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
903 | |
904 | /* | |
1ab1457c YH |
905 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
906 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
907 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
908 | * rely only on pmtu discovery" |
909 | */ | |
910 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
911 | mtu = IPV6_MAXPLEN; | |
912 | return mtu; | |
913 | } | |
914 | ||
3b00944c YH |
915 | static struct dst_entry *icmp6_dst_gc_list; |
916 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 917 | |
3b00944c | 918 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 919 | struct neighbour *neigh, |
3b00944c | 920 | struct in6_addr *addr) |
1da177e4 LT |
921 | { |
922 | struct rt6_info *rt; | |
923 | struct inet6_dev *idev = in6_dev_get(dev); | |
5578689a | 924 | struct net *net = dev->nd_net; |
1da177e4 LT |
925 | |
926 | if (unlikely(idev == NULL)) | |
927 | return NULL; | |
928 | ||
929 | rt = ip6_dst_alloc(); | |
930 | if (unlikely(rt == NULL)) { | |
931 | in6_dev_put(idev); | |
932 | goto out; | |
933 | } | |
934 | ||
935 | dev_hold(dev); | |
936 | if (neigh) | |
937 | neigh_hold(neigh); | |
938 | else | |
939 | neigh = ndisc_get_neigh(dev, addr); | |
940 | ||
941 | rt->rt6i_dev = dev; | |
942 | rt->rt6i_idev = idev; | |
943 | rt->rt6i_nexthop = neigh; | |
944 | atomic_set(&rt->u.dst.__refcnt, 1); | |
945 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
946 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 947 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 948 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
949 | |
950 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
951 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
952 | ? DST_HOST | |
1da177e4 LT |
953 | : 0; |
954 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
955 | rt->rt6i_dst.plen = 128; | |
956 | #endif | |
957 | ||
3b00944c YH |
958 | spin_lock_bh(&icmp6_dst_lock); |
959 | rt->u.dst.next = icmp6_dst_gc_list; | |
960 | icmp6_dst_gc_list = &rt->u.dst; | |
961 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 962 | |
5578689a | 963 | fib6_force_start_gc(net); |
1da177e4 LT |
964 | |
965 | out: | |
40aa7b90 | 966 | return &rt->u.dst; |
1da177e4 LT |
967 | } |
968 | ||
3b00944c | 969 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
970 | { |
971 | struct dst_entry *dst, *next, **pprev; | |
972 | int freed; | |
973 | ||
974 | next = NULL; | |
1ab1457c | 975 | freed = 0; |
5d0bbeeb | 976 | |
3b00944c YH |
977 | spin_lock_bh(&icmp6_dst_lock); |
978 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 979 | |
1da177e4 LT |
980 | while ((dst = *pprev) != NULL) { |
981 | if (!atomic_read(&dst->__refcnt)) { | |
982 | *pprev = dst->next; | |
983 | dst_free(dst); | |
984 | freed++; | |
985 | } else { | |
986 | pprev = &dst->next; | |
987 | (*more)++; | |
988 | } | |
989 | } | |
990 | ||
3b00944c | 991 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 992 | |
1da177e4 LT |
993 | return freed; |
994 | } | |
995 | ||
569d3645 | 996 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 LT |
997 | { |
998 | static unsigned expire = 30*HZ; | |
999 | static unsigned long last_gc; | |
1000 | unsigned long now = jiffies; | |
1001 | ||
4990509f DL |
1002 | if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && |
1003 | atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) | |
1da177e4 LT |
1004 | goto out; |
1005 | ||
1006 | expire++; | |
5b7c931d | 1007 | fib6_run_gc(expire, &init_net); |
1da177e4 LT |
1008 | last_gc = now; |
1009 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
4990509f | 1010 | expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; |
1da177e4 LT |
1011 | |
1012 | out: | |
4990509f DL |
1013 | expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; |
1014 | return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size); | |
1da177e4 LT |
1015 | } |
1016 | ||
1017 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1018 | but results in cleaner routing tables. | |
1019 | ||
1020 | Remove it only when all the things will work! | |
1021 | */ | |
1022 | ||
1023 | static int ipv6_get_mtu(struct net_device *dev) | |
1024 | { | |
1025 | int mtu = IPV6_MIN_MTU; | |
1026 | struct inet6_dev *idev; | |
1027 | ||
1028 | idev = in6_dev_get(dev); | |
1029 | if (idev) { | |
1030 | mtu = idev->cnf.mtu6; | |
1031 | in6_dev_put(idev); | |
1032 | } | |
1033 | return mtu; | |
1034 | } | |
1035 | ||
1036 | int ipv6_get_hoplimit(struct net_device *dev) | |
1037 | { | |
1038 | int hoplimit = ipv6_devconf.hop_limit; | |
1039 | struct inet6_dev *idev; | |
1040 | ||
1041 | idev = in6_dev_get(dev); | |
1042 | if (idev) { | |
1043 | hoplimit = idev->cnf.hop_limit; | |
1044 | in6_dev_put(idev); | |
1045 | } | |
1046 | return hoplimit; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * | |
1051 | */ | |
1052 | ||
86872cb5 | 1053 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1054 | { |
1055 | int err; | |
5578689a | 1056 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1057 | struct rt6_info *rt = NULL; |
1058 | struct net_device *dev = NULL; | |
1059 | struct inet6_dev *idev = NULL; | |
c71099ac | 1060 | struct fib6_table *table; |
1da177e4 LT |
1061 | int addr_type; |
1062 | ||
86872cb5 | 1063 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1064 | return -EINVAL; |
1065 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1066 | if (cfg->fc_src_len) |
1da177e4 LT |
1067 | return -EINVAL; |
1068 | #endif | |
86872cb5 | 1069 | if (cfg->fc_ifindex) { |
1da177e4 | 1070 | err = -ENODEV; |
5578689a | 1071 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1072 | if (!dev) |
1073 | goto out; | |
1074 | idev = in6_dev_get(dev); | |
1075 | if (!idev) | |
1076 | goto out; | |
1077 | } | |
1078 | ||
86872cb5 TG |
1079 | if (cfg->fc_metric == 0) |
1080 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1081 | |
5578689a | 1082 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1083 | if (table == NULL) { |
1084 | err = -ENOBUFS; | |
1085 | goto out; | |
1086 | } | |
1087 | ||
1da177e4 LT |
1088 | rt = ip6_dst_alloc(); |
1089 | ||
1090 | if (rt == NULL) { | |
1091 | err = -ENOMEM; | |
1092 | goto out; | |
1093 | } | |
1094 | ||
1095 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1096 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1097 | |
86872cb5 TG |
1098 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1099 | cfg->fc_protocol = RTPROT_BOOT; | |
1100 | rt->rt6i_protocol = cfg->fc_protocol; | |
1101 | ||
1102 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1103 | |
1104 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1105 | rt->u.dst.input = ip6_mc_input; | |
1106 | else | |
1107 | rt->u.dst.input = ip6_forward; | |
1108 | ||
1109 | rt->u.dst.output = ip6_output; | |
1110 | ||
86872cb5 TG |
1111 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1112 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1113 | if (rt->rt6i_dst.plen == 128) |
1114 | rt->u.dst.flags = DST_HOST; | |
1115 | ||
1116 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1117 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1118 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1119 | #endif |
1120 | ||
86872cb5 | 1121 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1122 | |
1123 | /* We cannot add true routes via loopback here, | |
1124 | they would result in kernel looping; promote them to reject routes | |
1125 | */ | |
86872cb5 | 1126 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1127 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1128 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1129 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1130 | if (dev) { |
1131 | dev_put(dev); | |
1132 | in6_dev_put(idev); | |
1133 | } | |
5578689a | 1134 | dev = net->loopback_dev; |
1da177e4 LT |
1135 | dev_hold(dev); |
1136 | idev = in6_dev_get(dev); | |
1137 | if (!idev) { | |
1138 | err = -ENODEV; | |
1139 | goto out; | |
1140 | } | |
1141 | } | |
1142 | rt->u.dst.output = ip6_pkt_discard_out; | |
1143 | rt->u.dst.input = ip6_pkt_discard; | |
1144 | rt->u.dst.error = -ENETUNREACH; | |
1145 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1146 | goto install_route; | |
1147 | } | |
1148 | ||
86872cb5 | 1149 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1150 | struct in6_addr *gw_addr; |
1151 | int gwa_type; | |
1152 | ||
86872cb5 TG |
1153 | gw_addr = &cfg->fc_gateway; |
1154 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1155 | gwa_type = ipv6_addr_type(gw_addr); |
1156 | ||
1157 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1158 | struct rt6_info *grt; | |
1159 | ||
1160 | /* IPv6 strictly inhibits using not link-local | |
1161 | addresses as nexthop address. | |
1162 | Otherwise, router will not able to send redirects. | |
1163 | It is very good, but in some (rare!) circumstances | |
1164 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1165 | some exceptions. --ANK | |
1166 | */ | |
1167 | err = -EINVAL; | |
1168 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1169 | goto out; | |
1170 | ||
5578689a | 1171 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1172 | |
1173 | err = -EHOSTUNREACH; | |
1174 | if (grt == NULL) | |
1175 | goto out; | |
1176 | if (dev) { | |
1177 | if (dev != grt->rt6i_dev) { | |
1178 | dst_release(&grt->u.dst); | |
1179 | goto out; | |
1180 | } | |
1181 | } else { | |
1182 | dev = grt->rt6i_dev; | |
1183 | idev = grt->rt6i_idev; | |
1184 | dev_hold(dev); | |
1185 | in6_dev_hold(grt->rt6i_idev); | |
1186 | } | |
1187 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1188 | err = 0; | |
1189 | dst_release(&grt->u.dst); | |
1190 | ||
1191 | if (err) | |
1192 | goto out; | |
1193 | } | |
1194 | err = -EINVAL; | |
1195 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1196 | goto out; | |
1197 | } | |
1198 | ||
1199 | err = -ENODEV; | |
1200 | if (dev == NULL) | |
1201 | goto out; | |
1202 | ||
86872cb5 | 1203 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1204 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1205 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1206 | err = PTR_ERR(rt->rt6i_nexthop); | |
1207 | rt->rt6i_nexthop = NULL; | |
1208 | goto out; | |
1209 | } | |
1210 | } | |
1211 | ||
86872cb5 | 1212 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1213 | |
1214 | install_route: | |
86872cb5 TG |
1215 | if (cfg->fc_mx) { |
1216 | struct nlattr *nla; | |
1217 | int remaining; | |
1218 | ||
1219 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1220 | int type = nla_type(nla); |
86872cb5 TG |
1221 | |
1222 | if (type) { | |
1223 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1224 | err = -EINVAL; |
1225 | goto out; | |
1226 | } | |
86872cb5 TG |
1227 | |
1228 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1229 | } |
1da177e4 LT |
1230 | } |
1231 | } | |
1232 | ||
1233 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1234 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1235 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1236 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1237 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
5578689a | 1238 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1239 | rt->u.dst.dev = dev; |
1240 | rt->rt6i_idev = idev; | |
c71099ac | 1241 | rt->rt6i_table = table; |
63152fc0 DL |
1242 | |
1243 | cfg->fc_nlinfo.nl_net = dev->nd_net; | |
1244 | ||
86872cb5 | 1245 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1246 | |
1247 | out: | |
1248 | if (dev) | |
1249 | dev_put(dev); | |
1250 | if (idev) | |
1251 | in6_dev_put(idev); | |
1252 | if (rt) | |
40aa7b90 | 1253 | dst_free(&rt->u.dst); |
1da177e4 LT |
1254 | return err; |
1255 | } | |
1256 | ||
86872cb5 | 1257 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1258 | { |
1259 | int err; | |
c71099ac | 1260 | struct fib6_table *table; |
8ed67789 | 1261 | struct net *net = rt->rt6i_dev->nd_net; |
1da177e4 | 1262 | |
8ed67789 | 1263 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1264 | return -ENOENT; |
1265 | ||
c71099ac TG |
1266 | table = rt->rt6i_table; |
1267 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1268 | |
86872cb5 | 1269 | err = fib6_del(rt, info); |
1da177e4 LT |
1270 | dst_release(&rt->u.dst); |
1271 | ||
c71099ac | 1272 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1273 | |
1274 | return err; | |
1275 | } | |
1276 | ||
e0a1ad73 TG |
1277 | int ip6_del_rt(struct rt6_info *rt) |
1278 | { | |
4d1169c1 | 1279 | struct nl_info info = { |
5578689a | 1280 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 1281 | }; |
528c4ceb | 1282 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1283 | } |
1284 | ||
86872cb5 | 1285 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1286 | { |
c71099ac | 1287 | struct fib6_table *table; |
1da177e4 LT |
1288 | struct fib6_node *fn; |
1289 | struct rt6_info *rt; | |
1290 | int err = -ESRCH; | |
1291 | ||
5578689a | 1292 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1293 | if (table == NULL) |
1294 | return err; | |
1295 | ||
1296 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1297 | |
c71099ac | 1298 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1299 | &cfg->fc_dst, cfg->fc_dst_len, |
1300 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1301 | |
1da177e4 | 1302 | if (fn) { |
7cc48263 | 1303 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1304 | if (cfg->fc_ifindex && |
1da177e4 | 1305 | (rt->rt6i_dev == NULL || |
86872cb5 | 1306 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1307 | continue; |
86872cb5 TG |
1308 | if (cfg->fc_flags & RTF_GATEWAY && |
1309 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1310 | continue; |
86872cb5 | 1311 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1312 | continue; |
1313 | dst_hold(&rt->u.dst); | |
c71099ac | 1314 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1315 | |
86872cb5 | 1316 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1317 | } |
1318 | } | |
c71099ac | 1319 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1320 | |
1321 | return err; | |
1322 | } | |
1323 | ||
1324 | /* | |
1325 | * Handle redirects | |
1326 | */ | |
a6279458 YH |
1327 | struct ip6rd_flowi { |
1328 | struct flowi fl; | |
1329 | struct in6_addr gateway; | |
1330 | }; | |
1331 | ||
8ed67789 DL |
1332 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1333 | struct fib6_table *table, | |
a6279458 YH |
1334 | struct flowi *fl, |
1335 | int flags) | |
1da177e4 | 1336 | { |
a6279458 YH |
1337 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1338 | struct rt6_info *rt; | |
e843b9e1 | 1339 | struct fib6_node *fn; |
c71099ac | 1340 | |
1da177e4 | 1341 | /* |
e843b9e1 YH |
1342 | * Get the "current" route for this destination and |
1343 | * check if the redirect has come from approriate router. | |
1344 | * | |
1345 | * RFC 2461 specifies that redirects should only be | |
1346 | * accepted if they come from the nexthop to the target. | |
1347 | * Due to the way the routes are chosen, this notion | |
1348 | * is a bit fuzzy and one might need to check all possible | |
1349 | * routes. | |
1da177e4 | 1350 | */ |
1da177e4 | 1351 | |
c71099ac | 1352 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1353 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1354 | restart: |
7cc48263 | 1355 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1356 | /* |
1357 | * Current route is on-link; redirect is always invalid. | |
1358 | * | |
1359 | * Seems, previous statement is not true. It could | |
1360 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1361 | * But then router serving it might decide, that we should | |
1362 | * know truth 8)8) --ANK (980726). | |
1363 | */ | |
1364 | if (rt6_check_expired(rt)) | |
1365 | continue; | |
1366 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1367 | continue; | |
a6279458 | 1368 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1369 | continue; |
a6279458 | 1370 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1371 | continue; |
1372 | break; | |
1373 | } | |
a6279458 | 1374 | |
cb15d9c2 | 1375 | if (!rt) |
8ed67789 DL |
1376 | rt = net->ipv6.ip6_null_entry; |
1377 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1378 | out: |
a6279458 YH |
1379 | dst_hold(&rt->u.dst); |
1380 | ||
c71099ac | 1381 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1382 | |
a6279458 YH |
1383 | return rt; |
1384 | }; | |
1385 | ||
1386 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1387 | struct in6_addr *src, | |
1388 | struct in6_addr *gateway, | |
1389 | struct net_device *dev) | |
1390 | { | |
adaa70bb | 1391 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
5578689a | 1392 | struct net *net = dev->nd_net; |
a6279458 YH |
1393 | struct ip6rd_flowi rdfl = { |
1394 | .fl = { | |
1395 | .oif = dev->ifindex, | |
1396 | .nl_u = { | |
1397 | .ip6_u = { | |
1398 | .daddr = *dest, | |
1399 | .saddr = *src, | |
1400 | }, | |
1401 | }, | |
1402 | }, | |
1403 | .gateway = *gateway, | |
1404 | }; | |
adaa70bb TG |
1405 | |
1406 | if (rt6_need_strict(dest)) | |
1407 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1408 | |
5578689a | 1409 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1410 | flags, __ip6_route_redirect); |
a6279458 YH |
1411 | } |
1412 | ||
1413 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1414 | struct in6_addr *saddr, | |
1415 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1416 | { | |
1417 | struct rt6_info *rt, *nrt = NULL; | |
1418 | struct netevent_redirect netevent; | |
8ed67789 | 1419 | struct net *net = neigh->dev->nd_net; |
a6279458 YH |
1420 | |
1421 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1422 | ||
8ed67789 | 1423 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1424 | if (net_ratelimit()) |
1425 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1426 | "for redirect target\n"); | |
a6279458 | 1427 | goto out; |
1da177e4 LT |
1428 | } |
1429 | ||
1da177e4 LT |
1430 | /* |
1431 | * We have finally decided to accept it. | |
1432 | */ | |
1433 | ||
1ab1457c | 1434 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1435 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1436 | NEIGH_UPDATE_F_OVERRIDE| | |
1437 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1438 | NEIGH_UPDATE_F_ISROUTER)) | |
1439 | ); | |
1440 | ||
1441 | /* | |
1442 | * Redirect received -> path was valid. | |
1443 | * Look, redirects are sent only in response to data packets, | |
1444 | * so that this nexthop apparently is reachable. --ANK | |
1445 | */ | |
1446 | dst_confirm(&rt->u.dst); | |
1447 | ||
1448 | /* Duplicate redirect: silently ignore. */ | |
1449 | if (neigh == rt->u.dst.neighbour) | |
1450 | goto out; | |
1451 | ||
1452 | nrt = ip6_rt_copy(rt); | |
1453 | if (nrt == NULL) | |
1454 | goto out; | |
1455 | ||
1456 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1457 | if (on_link) | |
1458 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1459 | ||
1460 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1461 | nrt->rt6i_dst.plen = 128; | |
1462 | nrt->u.dst.flags |= DST_HOST; | |
1463 | ||
1464 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1465 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1466 | /* Reset pmtu, it may be better */ | |
1467 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
5578689a DL |
1468 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(neigh->dev->nd_net, |
1469 | dst_mtu(&nrt->u.dst)); | |
1da177e4 | 1470 | |
40e22e8f | 1471 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1472 | goto out; |
1473 | ||
8d71740c TT |
1474 | netevent.old = &rt->u.dst; |
1475 | netevent.new = &nrt->u.dst; | |
1476 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1477 | ||
1da177e4 | 1478 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1479 | ip6_del_rt(rt); |
1da177e4 LT |
1480 | return; |
1481 | } | |
1482 | ||
1483 | out: | |
1ab1457c | 1484 | dst_release(&rt->u.dst); |
1da177e4 LT |
1485 | return; |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Handle ICMP "packet too big" messages | |
1490 | * i.e. Path MTU discovery | |
1491 | */ | |
1492 | ||
1493 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1494 | struct net_device *dev, u32 pmtu) | |
1495 | { | |
1496 | struct rt6_info *rt, *nrt; | |
5578689a | 1497 | struct net *net = dev->nd_net; |
1da177e4 LT |
1498 | int allfrag = 0; |
1499 | ||
5578689a | 1500 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1501 | if (rt == NULL) |
1502 | return; | |
1503 | ||
1504 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1505 | goto out; | |
1506 | ||
1507 | if (pmtu < IPV6_MIN_MTU) { | |
1508 | /* | |
1ab1457c | 1509 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1510 | * MTU (1280) and a fragment header should always be included |
1511 | * after a node receiving Too Big message reporting PMTU is | |
1512 | * less than the IPv6 Minimum Link MTU. | |
1513 | */ | |
1514 | pmtu = IPV6_MIN_MTU; | |
1515 | allfrag = 1; | |
1516 | } | |
1517 | ||
1518 | /* New mtu received -> path was valid. | |
1519 | They are sent only in response to data packets, | |
1520 | so that this nexthop apparently is reachable. --ANK | |
1521 | */ | |
1522 | dst_confirm(&rt->u.dst); | |
1523 | ||
1524 | /* Host route. If it is static, it would be better | |
1525 | not to override it, but add new one, so that | |
1526 | when cache entry will expire old pmtu | |
1527 | would return automatically. | |
1528 | */ | |
1529 | if (rt->rt6i_flags & RTF_CACHE) { | |
1530 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1531 | if (allfrag) | |
1532 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1533 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1534 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1535 | goto out; | |
1536 | } | |
1537 | ||
1538 | /* Network route. | |
1539 | Two cases are possible: | |
1540 | 1. It is connected route. Action: COW | |
1541 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1542 | */ | |
d5315b50 | 1543 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1544 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1545 | else |
1546 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1547 | |
d5315b50 | 1548 | if (nrt) { |
a1e78363 YH |
1549 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1550 | if (allfrag) | |
1551 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1552 | ||
1553 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1554 | * happened within 5 mins, the recommended timer is 10 mins. | |
1555 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1556 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1557 | * and detecting PMTU increase will be automatically happened. | |
1558 | */ | |
5578689a | 1559 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1560 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1561 | ||
40e22e8f | 1562 | ip6_ins_rt(nrt); |
1da177e4 | 1563 | } |
1da177e4 LT |
1564 | out: |
1565 | dst_release(&rt->u.dst); | |
1566 | } | |
1567 | ||
1568 | /* | |
1569 | * Misc support functions | |
1570 | */ | |
1571 | ||
1572 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1573 | { | |
1574 | struct rt6_info *rt = ip6_dst_alloc(); | |
1575 | ||
1576 | if (rt) { | |
1577 | rt->u.dst.input = ort->u.dst.input; | |
1578 | rt->u.dst.output = ort->u.dst.output; | |
1579 | ||
1580 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1581 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1582 | rt->u.dst.dev = ort->u.dst.dev; |
1583 | if (rt->u.dst.dev) | |
1584 | dev_hold(rt->u.dst.dev); | |
1585 | rt->rt6i_idev = ort->rt6i_idev; | |
1586 | if (rt->rt6i_idev) | |
1587 | in6_dev_hold(rt->rt6i_idev); | |
1588 | rt->u.dst.lastuse = jiffies; | |
1589 | rt->rt6i_expires = 0; | |
1590 | ||
1591 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1592 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1593 | rt->rt6i_metric = 0; | |
1594 | ||
1595 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1596 | #ifdef CONFIG_IPV6_SUBTREES | |
1597 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1598 | #endif | |
c71099ac | 1599 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1600 | } |
1601 | return rt; | |
1602 | } | |
1603 | ||
70ceb4f5 | 1604 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1605 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1606 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1607 | struct in6_addr *gwaddr, int ifindex) |
1608 | { | |
1609 | struct fib6_node *fn; | |
1610 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1611 | struct fib6_table *table; |
1612 | ||
efa2cea0 | 1613 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1614 | if (table == NULL) |
1615 | return NULL; | |
70ceb4f5 | 1616 | |
c71099ac TG |
1617 | write_lock_bh(&table->tb6_lock); |
1618 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1619 | if (!fn) |
1620 | goto out; | |
1621 | ||
7cc48263 | 1622 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1623 | if (rt->rt6i_dev->ifindex != ifindex) |
1624 | continue; | |
1625 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1626 | continue; | |
1627 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1628 | continue; | |
1629 | dst_hold(&rt->u.dst); | |
1630 | break; | |
1631 | } | |
1632 | out: | |
c71099ac | 1633 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1634 | return rt; |
1635 | } | |
1636 | ||
efa2cea0 DL |
1637 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1638 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1639 | struct in6_addr *gwaddr, int ifindex, |
1640 | unsigned pref) | |
1641 | { | |
86872cb5 TG |
1642 | struct fib6_config cfg = { |
1643 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1644 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1645 | .fc_ifindex = ifindex, |
1646 | .fc_dst_len = prefixlen, | |
1647 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1648 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1649 | .fc_nlinfo.pid = 0, |
1650 | .fc_nlinfo.nlh = NULL, | |
1651 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1652 | }; |
1653 | ||
1654 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1655 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1656 | |
e317da96 YH |
1657 | /* We should treat it as a default route if prefix length is 0. */ |
1658 | if (!prefixlen) | |
86872cb5 | 1659 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1660 | |
86872cb5 | 1661 | ip6_route_add(&cfg); |
70ceb4f5 | 1662 | |
efa2cea0 | 1663 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1664 | } |
1665 | #endif | |
1666 | ||
1da177e4 | 1667 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1668 | { |
1da177e4 | 1669 | struct rt6_info *rt; |
c71099ac | 1670 | struct fib6_table *table; |
1da177e4 | 1671 | |
5578689a | 1672 | table = fib6_get_table(dev->nd_net, RT6_TABLE_DFLT); |
c71099ac TG |
1673 | if (table == NULL) |
1674 | return NULL; | |
1da177e4 | 1675 | |
c71099ac | 1676 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1677 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1678 | if (dev == rt->rt6i_dev && |
045927ff | 1679 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1680 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1681 | break; | |
1682 | } | |
1683 | if (rt) | |
1684 | dst_hold(&rt->u.dst); | |
c71099ac | 1685 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1686 | return rt; |
1687 | } | |
1688 | ||
c7dc89c0 FT |
1689 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1690 | ||
1da177e4 | 1691 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1692 | struct net_device *dev, |
1693 | unsigned int pref) | |
1da177e4 | 1694 | { |
86872cb5 TG |
1695 | struct fib6_config cfg = { |
1696 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1697 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1698 | .fc_ifindex = dev->ifindex, |
1699 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1700 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1701 | .fc_nlinfo.pid = 0, |
1702 | .fc_nlinfo.nlh = NULL, | |
1703 | .fc_nlinfo.nl_net = dev->nd_net, | |
86872cb5 | 1704 | }; |
1da177e4 | 1705 | |
86872cb5 | 1706 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1707 | |
86872cb5 | 1708 | ip6_route_add(&cfg); |
1da177e4 | 1709 | |
1da177e4 LT |
1710 | return rt6_get_dflt_router(gwaddr, dev); |
1711 | } | |
1712 | ||
7b4da532 | 1713 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1714 | { |
1715 | struct rt6_info *rt; | |
c71099ac TG |
1716 | struct fib6_table *table; |
1717 | ||
1718 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1719 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1720 | if (table == NULL) |
1721 | return; | |
1da177e4 LT |
1722 | |
1723 | restart: | |
c71099ac | 1724 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1725 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1726 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1727 | dst_hold(&rt->u.dst); | |
c71099ac | 1728 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1729 | ip6_del_rt(rt); |
1da177e4 LT |
1730 | goto restart; |
1731 | } | |
1732 | } | |
c71099ac | 1733 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1734 | } |
1735 | ||
5578689a DL |
1736 | static void rtmsg_to_fib6_config(struct net *net, |
1737 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1738 | struct fib6_config *cfg) |
1739 | { | |
1740 | memset(cfg, 0, sizeof(*cfg)); | |
1741 | ||
1742 | cfg->fc_table = RT6_TABLE_MAIN; | |
1743 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1744 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1745 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1746 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1747 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1748 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1749 | ||
5578689a | 1750 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1751 | |
86872cb5 TG |
1752 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1753 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1754 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1755 | } | |
1756 | ||
5578689a | 1757 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1758 | { |
86872cb5 | 1759 | struct fib6_config cfg; |
1da177e4 LT |
1760 | struct in6_rtmsg rtmsg; |
1761 | int err; | |
1762 | ||
1763 | switch(cmd) { | |
1764 | case SIOCADDRT: /* Add a route */ | |
1765 | case SIOCDELRT: /* Delete a route */ | |
1766 | if (!capable(CAP_NET_ADMIN)) | |
1767 | return -EPERM; | |
1768 | err = copy_from_user(&rtmsg, arg, | |
1769 | sizeof(struct in6_rtmsg)); | |
1770 | if (err) | |
1771 | return -EFAULT; | |
86872cb5 | 1772 | |
5578689a | 1773 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1774 | |
1da177e4 LT |
1775 | rtnl_lock(); |
1776 | switch (cmd) { | |
1777 | case SIOCADDRT: | |
86872cb5 | 1778 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1779 | break; |
1780 | case SIOCDELRT: | |
86872cb5 | 1781 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1782 | break; |
1783 | default: | |
1784 | err = -EINVAL; | |
1785 | } | |
1786 | rtnl_unlock(); | |
1787 | ||
1788 | return err; | |
3ff50b79 | 1789 | } |
1da177e4 LT |
1790 | |
1791 | return -EINVAL; | |
1792 | } | |
1793 | ||
1794 | /* | |
1795 | * Drop the packet on the floor | |
1796 | */ | |
1797 | ||
50eb431d | 1798 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1799 | { |
612f09e8 YH |
1800 | int type; |
1801 | switch (ipstats_mib_noroutes) { | |
1802 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1803 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1804 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1805 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1806 | break; | |
1807 | } | |
1808 | /* FALLTHROUGH */ | |
1809 | case IPSTATS_MIB_OUTNOROUTES: | |
1810 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1811 | break; | |
1812 | } | |
9ce8ade0 | 1813 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1814 | kfree_skb(skb); |
1815 | return 0; | |
1816 | } | |
1817 | ||
9ce8ade0 TG |
1818 | static int ip6_pkt_discard(struct sk_buff *skb) |
1819 | { | |
612f09e8 | 1820 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1821 | } |
1822 | ||
20380731 | 1823 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1824 | { |
1825 | skb->dev = skb->dst->dev; | |
612f09e8 | 1826 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1827 | } |
1828 | ||
6723ab54 DM |
1829 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1830 | ||
9ce8ade0 TG |
1831 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1832 | { | |
612f09e8 | 1833 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1834 | } |
1835 | ||
1836 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1837 | { | |
1838 | skb->dev = skb->dst->dev; | |
612f09e8 | 1839 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1840 | } |
1841 | ||
6723ab54 DM |
1842 | #endif |
1843 | ||
1da177e4 LT |
1844 | /* |
1845 | * Allocate a dst for local (unicast / anycast) address. | |
1846 | */ | |
1847 | ||
1848 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1849 | const struct in6_addr *addr, | |
1850 | int anycast) | |
1851 | { | |
5578689a | 1852 | struct net *net = idev->dev->nd_net; |
1da177e4 LT |
1853 | struct rt6_info *rt = ip6_dst_alloc(); |
1854 | ||
1855 | if (rt == NULL) | |
1856 | return ERR_PTR(-ENOMEM); | |
1857 | ||
5578689a | 1858 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1859 | in6_dev_hold(idev); |
1860 | ||
1861 | rt->u.dst.flags = DST_HOST; | |
1862 | rt->u.dst.input = ip6_input; | |
1863 | rt->u.dst.output = ip6_output; | |
5578689a | 1864 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1865 | rt->rt6i_idev = idev; |
1866 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1867 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1868 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1869 | rt->u.dst.obsolete = -1; | |
1870 | ||
1871 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1872 | if (anycast) |
1873 | rt->rt6i_flags |= RTF_ANYCAST; | |
1874 | else | |
1da177e4 LT |
1875 | rt->rt6i_flags |= RTF_LOCAL; |
1876 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1877 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1878 | dst_free(&rt->u.dst); |
1da177e4 LT |
1879 | return ERR_PTR(-ENOMEM); |
1880 | } | |
1881 | ||
1882 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1883 | rt->rt6i_dst.plen = 128; | |
5578689a | 1884 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1885 | |
1886 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1887 | ||
1888 | return rt; | |
1889 | } | |
1890 | ||
8ed67789 DL |
1891 | struct arg_dev_net { |
1892 | struct net_device *dev; | |
1893 | struct net *net; | |
1894 | }; | |
1895 | ||
1da177e4 LT |
1896 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1897 | { | |
8ed67789 DL |
1898 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1899 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1900 | ||
1901 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1902 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1903 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1904 | return -1; | |
1905 | } | |
1906 | return 0; | |
1907 | } | |
1908 | ||
f3db4851 | 1909 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1910 | { |
8ed67789 DL |
1911 | struct arg_dev_net adn = { |
1912 | .dev = dev, | |
1913 | .net = net, | |
1914 | }; | |
1915 | ||
1916 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1da177e4 LT |
1917 | } |
1918 | ||
1919 | struct rt6_mtu_change_arg | |
1920 | { | |
1921 | struct net_device *dev; | |
1922 | unsigned mtu; | |
1923 | }; | |
1924 | ||
1925 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1926 | { | |
1927 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1928 | struct inet6_dev *idev; | |
5578689a | 1929 | struct net *net = arg->dev->nd_net; |
1da177e4 LT |
1930 | |
1931 | /* In IPv6 pmtu discovery is not optional, | |
1932 | so that RTAX_MTU lock cannot disable it. | |
1933 | We still use this lock to block changes | |
1934 | caused by addrconf/ndisc. | |
1935 | */ | |
1936 | ||
1937 | idev = __in6_dev_get(arg->dev); | |
1938 | if (idev == NULL) | |
1939 | return 0; | |
1940 | ||
1941 | /* For administrative MTU increase, there is no way to discover | |
1942 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1943 | Since RFC 1981 doesn't include administrative MTU increase | |
1944 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1945 | */ | |
1946 | /* | |
1947 | If new MTU is less than route PMTU, this new MTU will be the | |
1948 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1949 | decreases; if new MTU is greater than route PMTU, and the | |
1950 | old MTU is the lowest MTU in the path, update the route PMTU | |
1951 | to reflect the increase. In this case if the other nodes' MTU | |
1952 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1953 | PMTU discouvery. | |
1954 | */ | |
1955 | if (rt->rt6i_dev == arg->dev && | |
1956 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1957 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1958 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1959 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1960 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 1961 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 1962 | } |
1da177e4 LT |
1963 | return 0; |
1964 | } | |
1965 | ||
1966 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1967 | { | |
c71099ac TG |
1968 | struct rt6_mtu_change_arg arg = { |
1969 | .dev = dev, | |
1970 | .mtu = mtu, | |
1971 | }; | |
1da177e4 | 1972 | |
f3db4851 | 1973 | fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1974 | } |
1975 | ||
ef7c79ed | 1976 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1977 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1978 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1979 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1980 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1981 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1982 | }; | |
1983 | ||
1984 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1985 | struct fib6_config *cfg) | |
1da177e4 | 1986 | { |
86872cb5 TG |
1987 | struct rtmsg *rtm; |
1988 | struct nlattr *tb[RTA_MAX+1]; | |
1989 | int err; | |
1da177e4 | 1990 | |
86872cb5 TG |
1991 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1992 | if (err < 0) | |
1993 | goto errout; | |
1da177e4 | 1994 | |
86872cb5 TG |
1995 | err = -EINVAL; |
1996 | rtm = nlmsg_data(nlh); | |
1997 | memset(cfg, 0, sizeof(*cfg)); | |
1998 | ||
1999 | cfg->fc_table = rtm->rtm_table; | |
2000 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2001 | cfg->fc_src_len = rtm->rtm_src_len; | |
2002 | cfg->fc_flags = RTF_UP; | |
2003 | cfg->fc_protocol = rtm->rtm_protocol; | |
2004 | ||
2005 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2006 | cfg->fc_flags |= RTF_REJECT; | |
2007 | ||
2008 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2009 | cfg->fc_nlinfo.nlh = nlh; | |
2216b483 | 2010 | cfg->fc_nlinfo.nl_net = skb->sk->sk_net; |
86872cb5 TG |
2011 | |
2012 | if (tb[RTA_GATEWAY]) { | |
2013 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2014 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2015 | } |
86872cb5 TG |
2016 | |
2017 | if (tb[RTA_DST]) { | |
2018 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2019 | ||
2020 | if (nla_len(tb[RTA_DST]) < plen) | |
2021 | goto errout; | |
2022 | ||
2023 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2024 | } |
86872cb5 TG |
2025 | |
2026 | if (tb[RTA_SRC]) { | |
2027 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2028 | ||
2029 | if (nla_len(tb[RTA_SRC]) < plen) | |
2030 | goto errout; | |
2031 | ||
2032 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2033 | } |
86872cb5 TG |
2034 | |
2035 | if (tb[RTA_OIF]) | |
2036 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2037 | ||
2038 | if (tb[RTA_PRIORITY]) | |
2039 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2040 | ||
2041 | if (tb[RTA_METRICS]) { | |
2042 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2043 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2044 | } |
86872cb5 TG |
2045 | |
2046 | if (tb[RTA_TABLE]) | |
2047 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2048 | ||
2049 | err = 0; | |
2050 | errout: | |
2051 | return err; | |
1da177e4 LT |
2052 | } |
2053 | ||
c127ea2c | 2054 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2055 | { |
86872cb5 TG |
2056 | struct fib6_config cfg; |
2057 | int err; | |
1da177e4 | 2058 | |
86872cb5 TG |
2059 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2060 | if (err < 0) | |
2061 | return err; | |
2062 | ||
2063 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2064 | } |
2065 | ||
c127ea2c | 2066 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2067 | { |
86872cb5 TG |
2068 | struct fib6_config cfg; |
2069 | int err; | |
1da177e4 | 2070 | |
86872cb5 TG |
2071 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2072 | if (err < 0) | |
2073 | return err; | |
2074 | ||
2075 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2076 | } |
2077 | ||
339bf98f TG |
2078 | static inline size_t rt6_nlmsg_size(void) |
2079 | { | |
2080 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2081 | + nla_total_size(16) /* RTA_SRC */ | |
2082 | + nla_total_size(16) /* RTA_DST */ | |
2083 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2084 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2085 | + nla_total_size(4) /* RTA_TABLE */ | |
2086 | + nla_total_size(4) /* RTA_IIF */ | |
2087 | + nla_total_size(4) /* RTA_OIF */ | |
2088 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2089 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2090 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2091 | } | |
2092 | ||
1da177e4 | 2093 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2094 | struct in6_addr *dst, struct in6_addr *src, |
2095 | int iif, int type, u32 pid, u32 seq, | |
2096 | int prefix, unsigned int flags) | |
1da177e4 LT |
2097 | { |
2098 | struct rtmsg *rtm; | |
2d7202bf | 2099 | struct nlmsghdr *nlh; |
e3703b3d | 2100 | long expires; |
9e762a4a | 2101 | u32 table; |
1da177e4 LT |
2102 | |
2103 | if (prefix) { /* user wants prefix routes only */ | |
2104 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2105 | /* success since this is not a prefix route */ | |
2106 | return 1; | |
2107 | } | |
2108 | } | |
2109 | ||
2d7202bf TG |
2110 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2111 | if (nlh == NULL) | |
26932566 | 2112 | return -EMSGSIZE; |
2d7202bf TG |
2113 | |
2114 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2115 | rtm->rtm_family = AF_INET6; |
2116 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2117 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2118 | rtm->rtm_tos = 0; | |
c71099ac | 2119 | if (rt->rt6i_table) |
9e762a4a | 2120 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2121 | else |
9e762a4a PM |
2122 | table = RT6_TABLE_UNSPEC; |
2123 | rtm->rtm_table = table; | |
2d7202bf | 2124 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2125 | if (rt->rt6i_flags&RTF_REJECT) |
2126 | rtm->rtm_type = RTN_UNREACHABLE; | |
2127 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2128 | rtm->rtm_type = RTN_LOCAL; | |
2129 | else | |
2130 | rtm->rtm_type = RTN_UNICAST; | |
2131 | rtm->rtm_flags = 0; | |
2132 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2133 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2134 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2135 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2136 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2137 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2138 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2139 | rtm->rtm_protocol = RTPROT_RA; | |
2140 | ||
2141 | if (rt->rt6i_flags&RTF_CACHE) | |
2142 | rtm->rtm_flags |= RTM_F_CLONED; | |
2143 | ||
2144 | if (dst) { | |
2d7202bf | 2145 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2146 | rtm->rtm_dst_len = 128; |
1da177e4 | 2147 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2148 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2149 | #ifdef CONFIG_IPV6_SUBTREES |
2150 | if (src) { | |
2d7202bf | 2151 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2152 | rtm->rtm_src_len = 128; |
1da177e4 | 2153 | } else if (rtm->rtm_src_len) |
2d7202bf | 2154 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2155 | #endif |
2156 | if (iif) | |
2d7202bf | 2157 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2158 | else if (dst) { |
2159 | struct in6_addr saddr_buf; | |
5e5f3f0f YH |
2160 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
2161 | dst, &saddr_buf) == 0) | |
2d7202bf | 2162 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2163 | } |
2d7202bf | 2164 | |
1da177e4 | 2165 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2166 | goto nla_put_failure; |
2167 | ||
1da177e4 | 2168 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2169 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2170 | ||
1da177e4 | 2171 | if (rt->u.dst.dev) |
2d7202bf TG |
2172 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2173 | ||
2174 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2175 | |
2176 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2177 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2178 | expires, rt->u.dst.error) < 0) | |
2179 | goto nla_put_failure; | |
2d7202bf TG |
2180 | |
2181 | return nlmsg_end(skb, nlh); | |
2182 | ||
2183 | nla_put_failure: | |
26932566 PM |
2184 | nlmsg_cancel(skb, nlh); |
2185 | return -EMSGSIZE; | |
1da177e4 LT |
2186 | } |
2187 | ||
1b43af54 | 2188 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2189 | { |
2190 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2191 | int prefix; | |
2192 | ||
2d7202bf TG |
2193 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2194 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2195 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2196 | } else | |
2197 | prefix = 0; | |
2198 | ||
2199 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2200 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2201 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2202 | } |
2203 | ||
c127ea2c | 2204 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2205 | { |
b854272b | 2206 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2207 | struct nlattr *tb[RTA_MAX+1]; |
2208 | struct rt6_info *rt; | |
1da177e4 | 2209 | struct sk_buff *skb; |
ab364a6f | 2210 | struct rtmsg *rtm; |
1da177e4 | 2211 | struct flowi fl; |
ab364a6f | 2212 | int err, iif = 0; |
1da177e4 | 2213 | |
ab364a6f TG |
2214 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2215 | if (err < 0) | |
2216 | goto errout; | |
1da177e4 | 2217 | |
ab364a6f | 2218 | err = -EINVAL; |
1da177e4 | 2219 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2220 | |
ab364a6f TG |
2221 | if (tb[RTA_SRC]) { |
2222 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2223 | goto errout; | |
2224 | ||
2225 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2226 | } | |
2227 | ||
2228 | if (tb[RTA_DST]) { | |
2229 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2230 | goto errout; | |
2231 | ||
2232 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2233 | } | |
2234 | ||
2235 | if (tb[RTA_IIF]) | |
2236 | iif = nla_get_u32(tb[RTA_IIF]); | |
2237 | ||
2238 | if (tb[RTA_OIF]) | |
2239 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2240 | |
2241 | if (iif) { | |
2242 | struct net_device *dev; | |
5578689a | 2243 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2244 | if (!dev) { |
2245 | err = -ENODEV; | |
ab364a6f | 2246 | goto errout; |
1da177e4 LT |
2247 | } |
2248 | } | |
2249 | ||
ab364a6f TG |
2250 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2251 | if (skb == NULL) { | |
2252 | err = -ENOBUFS; | |
2253 | goto errout; | |
2254 | } | |
1da177e4 | 2255 | |
ab364a6f TG |
2256 | /* Reserve room for dummy headers, this skb can pass |
2257 | through good chunk of routing engine. | |
2258 | */ | |
459a98ed | 2259 | skb_reset_mac_header(skb); |
ab364a6f | 2260 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2261 | |
ab364a6f | 2262 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2263 | skb->dst = &rt->u.dst; |
2264 | ||
ab364a6f | 2265 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2266 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2267 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2268 | if (err < 0) { |
ab364a6f TG |
2269 | kfree_skb(skb); |
2270 | goto errout; | |
1da177e4 LT |
2271 | } |
2272 | ||
5578689a | 2273 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2274 | errout: |
1da177e4 | 2275 | return err; |
1da177e4 LT |
2276 | } |
2277 | ||
86872cb5 | 2278 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2279 | { |
2280 | struct sk_buff *skb; | |
5578689a | 2281 | struct net *net = info->nl_net; |
528c4ceb DL |
2282 | u32 seq; |
2283 | int err; | |
2284 | ||
2285 | err = -ENOBUFS; | |
2286 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2287 | |
339bf98f | 2288 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2289 | if (skb == NULL) |
2290 | goto errout; | |
2291 | ||
528c4ceb DL |
2292 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2293 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2294 | if (err < 0) { |
2295 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2296 | WARN_ON(err == -EMSGSIZE); | |
2297 | kfree_skb(skb); | |
2298 | goto errout; | |
2299 | } | |
5578689a DL |
2300 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2301 | info->nlh, gfp_any()); | |
21713ebc TG |
2302 | errout: |
2303 | if (err < 0) | |
5578689a | 2304 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2305 | } |
2306 | ||
8ed67789 DL |
2307 | static int ip6_route_dev_notify(struct notifier_block *this, |
2308 | unsigned long event, void *data) | |
2309 | { | |
2310 | struct net_device *dev = (struct net_device *)data; | |
2311 | struct net *net = dev->nd_net; | |
2312 | ||
2313 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2314 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2315 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2316 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2317 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2318 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2319 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2320 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2321 | #endif | |
2322 | } | |
2323 | ||
2324 | return NOTIFY_OK; | |
2325 | } | |
2326 | ||
1da177e4 LT |
2327 | /* |
2328 | * /proc | |
2329 | */ | |
2330 | ||
2331 | #ifdef CONFIG_PROC_FS | |
2332 | ||
2333 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2334 | ||
2335 | struct rt6_proc_arg | |
2336 | { | |
2337 | char *buffer; | |
2338 | int offset; | |
2339 | int length; | |
2340 | int skip; | |
2341 | int len; | |
2342 | }; | |
2343 | ||
2344 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2345 | { | |
33120b30 | 2346 | struct seq_file *m = p_arg; |
1da177e4 | 2347 | |
33120b30 AD |
2348 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2349 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2350 | |
2351 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2352 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2353 | rt->rt6i_src.plen); | |
1da177e4 | 2354 | #else |
33120b30 | 2355 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2356 | #endif |
2357 | ||
2358 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2359 | seq_printf(m, NIP6_SEQFMT, |
2360 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2361 | } else { |
33120b30 | 2362 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2363 | } |
33120b30 AD |
2364 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2365 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2366 | rt->u.dst.__use, rt->rt6i_flags, | |
2367 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2368 | return 0; |
2369 | } | |
2370 | ||
33120b30 | 2371 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2372 | { |
f3db4851 DL |
2373 | struct net *net = (struct net *)m->private; |
2374 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2375 | return 0; |
2376 | } | |
1da177e4 | 2377 | |
33120b30 AD |
2378 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2379 | { | |
f3db4851 DL |
2380 | struct net *net = get_proc_net(inode); |
2381 | if (!net) | |
2382 | return -ENXIO; | |
2383 | return single_open(file, ipv6_route_show, net); | |
2384 | } | |
2385 | ||
2386 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2387 | { | |
2388 | struct seq_file *seq = file->private_data; | |
2389 | struct net *net = seq->private; | |
2390 | put_net(net); | |
2391 | return single_release(inode, file); | |
1da177e4 LT |
2392 | } |
2393 | ||
33120b30 AD |
2394 | static const struct file_operations ipv6_route_proc_fops = { |
2395 | .owner = THIS_MODULE, | |
2396 | .open = ipv6_route_open, | |
2397 | .read = seq_read, | |
2398 | .llseek = seq_lseek, | |
f3db4851 | 2399 | .release = ipv6_route_release, |
33120b30 AD |
2400 | }; |
2401 | ||
1da177e4 LT |
2402 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2403 | { | |
69ddb805 | 2404 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2405 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2406 | net->ipv6.rt6_stats->fib_nodes, |
2407 | net->ipv6.rt6_stats->fib_route_nodes, | |
2408 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2409 | net->ipv6.rt6_stats->fib_rt_entries, | |
2410 | net->ipv6.rt6_stats->fib_rt_cache, | |
c572872f | 2411 | atomic_read(&ip6_dst_ops.entries), |
69ddb805 | 2412 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2413 | |
2414 | return 0; | |
2415 | } | |
2416 | ||
2417 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2418 | { | |
69ddb805 DL |
2419 | struct net *net = get_proc_net(inode); |
2420 | return single_open(file, rt6_stats_seq_show, net); | |
2421 | } | |
2422 | ||
2423 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2424 | { | |
2425 | struct seq_file *seq = file->private_data; | |
2426 | struct net *net = (struct net *)seq->private; | |
2427 | put_net(net); | |
2428 | return single_release(inode, file); | |
1da177e4 LT |
2429 | } |
2430 | ||
9a32144e | 2431 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2432 | .owner = THIS_MODULE, |
2433 | .open = rt6_stats_seq_open, | |
2434 | .read = seq_read, | |
2435 | .llseek = seq_lseek, | |
69ddb805 | 2436 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2437 | }; |
2438 | #endif /* CONFIG_PROC_FS */ | |
2439 | ||
2440 | #ifdef CONFIG_SYSCTL | |
2441 | ||
1da177e4 LT |
2442 | static |
2443 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2444 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2445 | { | |
5b7c931d DL |
2446 | struct net *net = current->nsproxy->net_ns; |
2447 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2448 | if (write) { |
2449 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2450 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2451 | return 0; |
2452 | } else | |
2453 | return -EINVAL; | |
2454 | } | |
2455 | ||
760f2d01 | 2456 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2457 | { |
1da177e4 | 2458 | .procname = "flush", |
4990509f | 2459 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2460 | .maxlen = sizeof(int), |
89c8b3a1 | 2461 | .mode = 0200, |
1ab1457c | 2462 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2463 | }, |
2464 | { | |
2465 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2466 | .procname = "gc_thresh", | |
1ab1457c | 2467 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2468 | .maxlen = sizeof(int), |
2469 | .mode = 0644, | |
1ab1457c | 2470 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2471 | }, |
2472 | { | |
2473 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2474 | .procname = "max_size", | |
4990509f | 2475 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2476 | .maxlen = sizeof(int), |
2477 | .mode = 0644, | |
1ab1457c | 2478 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2479 | }, |
2480 | { | |
2481 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2482 | .procname = "gc_min_interval", | |
4990509f | 2483 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2484 | .maxlen = sizeof(int), |
2485 | .mode = 0644, | |
1ab1457c | 2486 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2487 | .strategy = &sysctl_jiffies, |
2488 | }, | |
2489 | { | |
2490 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2491 | .procname = "gc_timeout", | |
4990509f | 2492 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2493 | .maxlen = sizeof(int), |
2494 | .mode = 0644, | |
1ab1457c | 2495 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2496 | .strategy = &sysctl_jiffies, |
2497 | }, | |
2498 | { | |
2499 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2500 | .procname = "gc_interval", | |
4990509f | 2501 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2502 | .maxlen = sizeof(int), |
2503 | .mode = 0644, | |
1ab1457c | 2504 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2505 | .strategy = &sysctl_jiffies, |
2506 | }, | |
2507 | { | |
2508 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2509 | .procname = "gc_elasticity", | |
4990509f | 2510 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2511 | .maxlen = sizeof(int), |
2512 | .mode = 0644, | |
1ab1457c | 2513 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2514 | .strategy = &sysctl_jiffies, |
2515 | }, | |
2516 | { | |
2517 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2518 | .procname = "mtu_expires", | |
4990509f | 2519 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2520 | .maxlen = sizeof(int), |
2521 | .mode = 0644, | |
1ab1457c | 2522 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2523 | .strategy = &sysctl_jiffies, |
2524 | }, | |
2525 | { | |
2526 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2527 | .procname = "min_adv_mss", | |
4990509f | 2528 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2529 | .maxlen = sizeof(int), |
2530 | .mode = 0644, | |
1ab1457c | 2531 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2532 | .strategy = &sysctl_jiffies, |
2533 | }, | |
2534 | { | |
2535 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2536 | .procname = "gc_min_interval_ms", | |
4990509f | 2537 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2538 | .maxlen = sizeof(int), |
2539 | .mode = 0644, | |
1ab1457c | 2540 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2541 | .strategy = &sysctl_ms_jiffies, |
2542 | }, | |
2543 | { .ctl_name = 0 } | |
2544 | }; | |
2545 | ||
760f2d01 DL |
2546 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2547 | { | |
2548 | struct ctl_table *table; | |
2549 | ||
2550 | table = kmemdup(ipv6_route_table_template, | |
2551 | sizeof(ipv6_route_table_template), | |
2552 | GFP_KERNEL); | |
5ee09105 YH |
2553 | |
2554 | if (table) { | |
2555 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
2556 | /* table[1].data will be handled when we have | |
2557 | routes per namespace */ | |
2558 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; | |
2559 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2560 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2561 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2562 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2563 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2564 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2565 | } | |
2566 | ||
760f2d01 DL |
2567 | return table; |
2568 | } | |
1da177e4 LT |
2569 | #endif |
2570 | ||
cdb18761 DL |
2571 | static int ip6_route_net_init(struct net *net) |
2572 | { | |
8ed67789 DL |
2573 | int ret = 0; |
2574 | ||
2575 | ret = -ENOMEM; | |
2576 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, | |
2577 | sizeof(*net->ipv6.ip6_null_entry), | |
2578 | GFP_KERNEL); | |
2579 | if (!net->ipv6.ip6_null_entry) | |
2580 | goto out; | |
2581 | net->ipv6.ip6_null_entry->u.dst.path = | |
2582 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
2583 | ||
2584 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2585 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2586 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2587 | GFP_KERNEL); | |
2588 | if (!net->ipv6.ip6_prohibit_entry) { | |
2589 | kfree(net->ipv6.ip6_null_entry); | |
2590 | goto out; | |
2591 | } | |
2592 | net->ipv6.ip6_prohibit_entry->u.dst.path = | |
2593 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
2594 | ||
2595 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2596 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2597 | GFP_KERNEL); | |
2598 | if (!net->ipv6.ip6_blk_hole_entry) { | |
2599 | kfree(net->ipv6.ip6_null_entry); | |
2600 | kfree(net->ipv6.ip6_prohibit_entry); | |
2601 | goto out; | |
2602 | } | |
2603 | net->ipv6.ip6_blk_hole_entry->u.dst.path = | |
2604 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
2605 | #endif | |
2606 | ||
cdb18761 DL |
2607 | #ifdef CONFIG_PROC_FS |
2608 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2609 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2610 | #endif | |
8ed67789 DL |
2611 | ret = 0; |
2612 | out: | |
2613 | return ret; | |
cdb18761 DL |
2614 | } |
2615 | ||
2616 | static void ip6_route_net_exit(struct net *net) | |
2617 | { | |
2618 | #ifdef CONFIG_PROC_FS | |
2619 | proc_net_remove(net, "ipv6_route"); | |
2620 | proc_net_remove(net, "rt6_stats"); | |
2621 | #endif | |
8ed67789 DL |
2622 | kfree(net->ipv6.ip6_null_entry); |
2623 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2624 | kfree(net->ipv6.ip6_prohibit_entry); | |
2625 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2626 | #endif | |
cdb18761 DL |
2627 | } |
2628 | ||
2629 | static struct pernet_operations ip6_route_net_ops = { | |
2630 | .init = ip6_route_net_init, | |
2631 | .exit = ip6_route_net_exit, | |
2632 | }; | |
2633 | ||
8ed67789 DL |
2634 | static struct notifier_block ip6_route_dev_notifier = { |
2635 | .notifier_call = ip6_route_dev_notify, | |
2636 | .priority = 0, | |
2637 | }; | |
2638 | ||
433d49c3 | 2639 | int __init ip6_route_init(void) |
1da177e4 | 2640 | { |
433d49c3 DL |
2641 | int ret; |
2642 | ||
e5d679f3 AD |
2643 | ip6_dst_ops.kmem_cachep = |
2644 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
f845ab6b DL |
2645 | SLAB_HWCACHE_ALIGN, NULL); |
2646 | if (!ip6_dst_ops.kmem_cachep) | |
2647 | return -ENOMEM; | |
2648 | ||
14e50e57 DM |
2649 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
2650 | ||
8ed67789 DL |
2651 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2652 | if (ret) | |
bdb3289f | 2653 | goto out_kmem_cache; |
bdb3289f | 2654 | |
8ed67789 DL |
2655 | /* Registering of the loopback is done before this portion of code, |
2656 | * the loopback reference in rt6_info will not be taken, do it | |
2657 | * manually for init_net */ | |
2658 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2659 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2660 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2661 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2662 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2663 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2664 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2665 | #endif | |
433d49c3 DL |
2666 | ret = fib6_init(); |
2667 | if (ret) | |
8ed67789 | 2668 | goto out_register_subsys; |
433d49c3 | 2669 | |
433d49c3 DL |
2670 | ret = xfrm6_init(); |
2671 | if (ret) | |
cdb18761 | 2672 | goto out_fib6_init; |
c35b7e72 | 2673 | |
433d49c3 DL |
2674 | ret = fib6_rules_init(); |
2675 | if (ret) | |
2676 | goto xfrm6_init; | |
7e5449c2 | 2677 | |
433d49c3 DL |
2678 | ret = -ENOBUFS; |
2679 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2680 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2681 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2682 | goto fib6_rules_init; | |
c127ea2c | 2683 | |
8ed67789 | 2684 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2685 | if (ret) |
2686 | goto fib6_rules_init; | |
8ed67789 | 2687 | |
433d49c3 DL |
2688 | out: |
2689 | return ret; | |
2690 | ||
2691 | fib6_rules_init: | |
433d49c3 DL |
2692 | fib6_rules_cleanup(); |
2693 | xfrm6_init: | |
433d49c3 | 2694 | xfrm6_fini(); |
433d49c3 | 2695 | out_fib6_init: |
433d49c3 | 2696 | fib6_gc_cleanup(); |
8ed67789 DL |
2697 | out_register_subsys: |
2698 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 DL |
2699 | out_kmem_cache: |
2700 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2701 | goto out; | |
1da177e4 LT |
2702 | } |
2703 | ||
2704 | void ip6_route_cleanup(void) | |
2705 | { | |
8ed67789 | 2706 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2707 | fib6_rules_cleanup(); |
1da177e4 | 2708 | xfrm6_fini(); |
1da177e4 | 2709 | fib6_gc_cleanup(); |
8ed67789 | 2710 | unregister_pernet_subsys(&ip6_route_net_ops); |
1da177e4 LT |
2711 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); |
2712 | } |