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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 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
7bc570c8 | 37 | #include <linux/mroute6.h> |
1da177e4 | 38 | #include <linux/init.h> |
1da177e4 | 39 | #include <linux/if_arp.h> |
1da177e4 LT |
40 | #include <linux/proc_fs.h> |
41 | #include <linux/seq_file.h> | |
5b7c931d | 42 | #include <linux/nsproxy.h> |
457c4cbc | 43 | #include <net/net_namespace.h> |
1da177e4 LT |
44 | #include <net/snmp.h> |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_fib.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/tcp.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/xfrm.h> | |
8d71740c | 54 | #include <net/netevent.h> |
21713ebc | 55 | #include <net/netlink.h> |
1da177e4 LT |
56 | |
57 | #include <asm/uaccess.h> | |
58 | ||
59 | #ifdef CONFIG_SYSCTL | |
60 | #include <linux/sysctl.h> | |
61 | #endif | |
62 | ||
63 | /* Set to 3 to get tracing. */ | |
64 | #define RT6_DEBUG 2 | |
65 | ||
66 | #if RT6_DEBUG >= 3 | |
67 | #define RDBG(x) printk x | |
68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
69 | #else | |
70 | #define RDBG(x) | |
71 | #define RT6_TRACE(x...) do { ; } while (0) | |
72 | #endif | |
73 | ||
519fbd87 | 74 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 75 | |
1da177e4 LT |
76 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
78 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
79 | static void ip6_dst_destroy(struct dst_entry *); | |
80 | static void ip6_dst_ifdown(struct dst_entry *, | |
81 | struct net_device *dev, int how); | |
569d3645 | 82 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
83 | |
84 | static int ip6_pkt_discard(struct sk_buff *skb); | |
85 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
86 | static void ip6_link_failure(struct sk_buff *skb); | |
87 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
88 | ||
70ceb4f5 | 89 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
90 | static struct rt6_info *rt6_add_route_info(struct net *net, |
91 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
92 | struct in6_addr *gwaddr, int ifindex, |
93 | unsigned pref); | |
efa2cea0 DL |
94 | static struct rt6_info *rt6_get_route_info(struct net *net, |
95 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
96 | struct in6_addr *gwaddr, int ifindex); |
97 | #endif | |
98 | ||
9a7ec3a9 | 99 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 LT |
100 | .family = AF_INET6, |
101 | .protocol = __constant_htons(ETH_P_IPV6), | |
102 | .gc = ip6_dst_gc, | |
103 | .gc_thresh = 1024, | |
104 | .check = ip6_dst_check, | |
105 | .destroy = ip6_dst_destroy, | |
106 | .ifdown = ip6_dst_ifdown, | |
107 | .negative_advice = ip6_negative_advice, | |
108 | .link_failure = ip6_link_failure, | |
109 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 110 | .local_out = __ip6_local_out, |
e2422970 | 111 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
112 | }; |
113 | ||
14e50e57 DM |
114 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
115 | { | |
116 | } | |
117 | ||
118 | static struct dst_ops ip6_dst_blackhole_ops = { | |
119 | .family = AF_INET6, | |
120 | .protocol = __constant_htons(ETH_P_IPV6), | |
121 | .destroy = ip6_dst_destroy, | |
122 | .check = ip6_dst_check, | |
123 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
e2422970 | 124 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
125 | }; |
126 | ||
bdb3289f | 127 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
128 | .u = { |
129 | .dst = { | |
130 | .__refcnt = ATOMIC_INIT(1), | |
131 | .__use = 1, | |
1da177e4 LT |
132 | .obsolete = -1, |
133 | .error = -ENETUNREACH, | |
134 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
135 | .input = ip6_pkt_discard, | |
136 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
137 | } |
138 | }, | |
139 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
140 | .rt6i_metric = ~(u32) 0, | |
141 | .rt6i_ref = ATOMIC_INIT(1), | |
142 | }; | |
143 | ||
101367c2 TG |
144 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
145 | ||
6723ab54 DM |
146 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
147 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 148 | |
280a34c8 | 149 | static struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
150 | .u = { |
151 | .dst = { | |
152 | .__refcnt = ATOMIC_INIT(1), | |
153 | .__use = 1, | |
101367c2 TG |
154 | .obsolete = -1, |
155 | .error = -EACCES, | |
156 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
157 | .input = ip6_pkt_prohibit, |
158 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
159 | } |
160 | }, | |
161 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
162 | .rt6i_metric = ~(u32) 0, | |
163 | .rt6i_ref = ATOMIC_INIT(1), | |
164 | }; | |
165 | ||
bdb3289f | 166 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
167 | .u = { |
168 | .dst = { | |
169 | .__refcnt = ATOMIC_INIT(1), | |
170 | .__use = 1, | |
101367c2 TG |
171 | .obsolete = -1, |
172 | .error = -EINVAL, | |
173 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
174 | .input = dst_discard, |
175 | .output = dst_discard, | |
101367c2 TG |
176 | } |
177 | }, | |
178 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
179 | .rt6i_metric = ~(u32) 0, | |
180 | .rt6i_ref = ATOMIC_INIT(1), | |
181 | }; | |
182 | ||
183 | #endif | |
184 | ||
1da177e4 | 185 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 186 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 187 | { |
f2fc6a54 | 188 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
189 | } |
190 | ||
191 | static void ip6_dst_destroy(struct dst_entry *dst) | |
192 | { | |
193 | struct rt6_info *rt = (struct rt6_info *)dst; | |
194 | struct inet6_dev *idev = rt->rt6i_idev; | |
195 | ||
196 | if (idev != NULL) { | |
197 | rt->rt6i_idev = NULL; | |
198 | in6_dev_put(idev); | |
1ab1457c | 199 | } |
1da177e4 LT |
200 | } |
201 | ||
202 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
203 | int how) | |
204 | { | |
205 | struct rt6_info *rt = (struct rt6_info *)dst; | |
206 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 207 | struct net_device *loopback_dev = |
c346dca1 | 208 | dev_net(dev)->loopback_dev; |
1da177e4 | 209 | |
5a3e55d6 DL |
210 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
211 | struct inet6_dev *loopback_idev = | |
212 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
213 | if (loopback_idev != NULL) { |
214 | rt->rt6i_idev = loopback_idev; | |
215 | in6_dev_put(idev); | |
216 | } | |
217 | } | |
218 | } | |
219 | ||
220 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
221 | { | |
222 | return (rt->rt6i_flags & RTF_EXPIRES && | |
223 | time_after(jiffies, rt->rt6i_expires)); | |
224 | } | |
225 | ||
c71099ac TG |
226 | static inline int rt6_need_strict(struct in6_addr *daddr) |
227 | { | |
228 | return (ipv6_addr_type(daddr) & | |
5ce83afa | 229 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)); |
c71099ac TG |
230 | } |
231 | ||
1da177e4 | 232 | /* |
c71099ac | 233 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
234 | */ |
235 | ||
8ed67789 DL |
236 | static inline struct rt6_info *rt6_device_match(struct net *net, |
237 | struct rt6_info *rt, | |
dd3abc4e | 238 | struct in6_addr *saddr, |
1da177e4 | 239 | int oif, |
d420895e | 240 | int flags) |
1da177e4 LT |
241 | { |
242 | struct rt6_info *local = NULL; | |
243 | struct rt6_info *sprt; | |
244 | ||
dd3abc4e YH |
245 | if (!oif && ipv6_addr_any(saddr)) |
246 | goto out; | |
247 | ||
248 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { | |
249 | struct net_device *dev = sprt->rt6i_dev; | |
250 | ||
251 | if (oif) { | |
1da177e4 LT |
252 | if (dev->ifindex == oif) |
253 | return sprt; | |
254 | if (dev->flags & IFF_LOOPBACK) { | |
255 | if (sprt->rt6i_idev == NULL || | |
256 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 257 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 258 | continue; |
1ab1457c | 259 | if (local && (!oif || |
1da177e4 LT |
260 | local->rt6i_idev->dev->ifindex == oif)) |
261 | continue; | |
262 | } | |
263 | local = sprt; | |
264 | } | |
dd3abc4e YH |
265 | } else { |
266 | if (ipv6_chk_addr(net, saddr, dev, | |
267 | flags & RT6_LOOKUP_F_IFACE)) | |
268 | return sprt; | |
1da177e4 | 269 | } |
dd3abc4e | 270 | } |
1da177e4 | 271 | |
dd3abc4e | 272 | if (oif) { |
1da177e4 LT |
273 | if (local) |
274 | return local; | |
275 | ||
d420895e | 276 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 277 | return net->ipv6.ip6_null_entry; |
1da177e4 | 278 | } |
dd3abc4e | 279 | out: |
1da177e4 LT |
280 | return rt; |
281 | } | |
282 | ||
27097255 YH |
283 | #ifdef CONFIG_IPV6_ROUTER_PREF |
284 | static void rt6_probe(struct rt6_info *rt) | |
285 | { | |
286 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
287 | /* | |
288 | * Okay, this does not seem to be appropriate | |
289 | * for now, however, we need to check if it | |
290 | * is really so; aka Router Reachability Probing. | |
291 | * | |
292 | * Router Reachability Probe MUST be rate-limited | |
293 | * to no more than one per minute. | |
294 | */ | |
295 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
296 | return; | |
297 | read_lock_bh(&neigh->lock); | |
298 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 299 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
300 | struct in6_addr mcaddr; |
301 | struct in6_addr *target; | |
302 | ||
303 | neigh->updated = jiffies; | |
304 | read_unlock_bh(&neigh->lock); | |
305 | ||
306 | target = (struct in6_addr *)&neigh->primary_key; | |
307 | addrconf_addr_solict_mult(target, &mcaddr); | |
308 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
309 | } else | |
310 | read_unlock_bh(&neigh->lock); | |
311 | } | |
312 | #else | |
313 | static inline void rt6_probe(struct rt6_info *rt) | |
314 | { | |
315 | return; | |
316 | } | |
317 | #endif | |
318 | ||
1da177e4 | 319 | /* |
554cfb7e | 320 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 321 | */ |
b6f99a21 | 322 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
323 | { |
324 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 325 | if (!oif || dev->ifindex == oif) |
554cfb7e | 326 | return 2; |
161980f4 DM |
327 | if ((dev->flags & IFF_LOOPBACK) && |
328 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
329 | return 1; | |
330 | return 0; | |
554cfb7e | 331 | } |
1da177e4 | 332 | |
b6f99a21 | 333 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 334 | { |
554cfb7e | 335 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 336 | int m; |
4d0c5911 YH |
337 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
338 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
339 | m = 1; | |
340 | else if (neigh) { | |
554cfb7e YH |
341 | read_lock_bh(&neigh->lock); |
342 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 343 | m = 2; |
398bcbeb YH |
344 | #ifdef CONFIG_IPV6_ROUTER_PREF |
345 | else if (neigh->nud_state & NUD_FAILED) | |
346 | m = 0; | |
347 | #endif | |
348 | else | |
ea73ee23 | 349 | m = 1; |
554cfb7e | 350 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
351 | } else |
352 | m = 0; | |
554cfb7e | 353 | return m; |
1da177e4 LT |
354 | } |
355 | ||
554cfb7e YH |
356 | static int rt6_score_route(struct rt6_info *rt, int oif, |
357 | int strict) | |
1da177e4 | 358 | { |
4d0c5911 | 359 | int m, n; |
1ab1457c | 360 | |
4d0c5911 | 361 | m = rt6_check_dev(rt, oif); |
77d16f45 | 362 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 363 | return -1; |
ebacaaa0 YH |
364 | #ifdef CONFIG_IPV6_ROUTER_PREF |
365 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
366 | #endif | |
4d0c5911 | 367 | n = rt6_check_neigh(rt); |
557e92ef | 368 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
369 | return -1; |
370 | return m; | |
371 | } | |
372 | ||
f11e6659 DM |
373 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
374 | int *mpri, struct rt6_info *match) | |
554cfb7e | 375 | { |
f11e6659 DM |
376 | int m; |
377 | ||
378 | if (rt6_check_expired(rt)) | |
379 | goto out; | |
380 | ||
381 | m = rt6_score_route(rt, oif, strict); | |
382 | if (m < 0) | |
383 | goto out; | |
384 | ||
385 | if (m > *mpri) { | |
386 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
387 | rt6_probe(match); | |
388 | *mpri = m; | |
389 | match = rt; | |
390 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
391 | rt6_probe(rt); | |
392 | } | |
393 | ||
394 | out: | |
395 | return match; | |
396 | } | |
397 | ||
398 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
399 | struct rt6_info *rr_head, | |
400 | u32 metric, int oif, int strict) | |
401 | { | |
402 | struct rt6_info *rt, *match; | |
554cfb7e | 403 | int mpri = -1; |
1da177e4 | 404 | |
f11e6659 DM |
405 | match = NULL; |
406 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
407 | rt = rt->u.dst.rt6_next) | |
408 | match = find_match(rt, oif, strict, &mpri, match); | |
409 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
410 | rt = rt->u.dst.rt6_next) | |
411 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 412 | |
f11e6659 DM |
413 | return match; |
414 | } | |
1da177e4 | 415 | |
f11e6659 DM |
416 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
417 | { | |
418 | struct rt6_info *match, *rt0; | |
8ed67789 | 419 | struct net *net; |
1da177e4 | 420 | |
f11e6659 | 421 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 422 | __func__, fn->leaf, oif); |
554cfb7e | 423 | |
f11e6659 DM |
424 | rt0 = fn->rr_ptr; |
425 | if (!rt0) | |
426 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 427 | |
f11e6659 | 428 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 429 | |
554cfb7e | 430 | if (!match && |
f11e6659 DM |
431 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
432 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
433 | ||
554cfb7e | 434 | /* no entries matched; do round-robin */ |
f11e6659 DM |
435 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
436 | next = fn->leaf; | |
437 | ||
438 | if (next != rt0) | |
439 | fn->rr_ptr = next; | |
1da177e4 | 440 | } |
1da177e4 | 441 | |
f11e6659 | 442 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 443 | __func__, match); |
1da177e4 | 444 | |
c346dca1 | 445 | net = dev_net(rt0->rt6i_dev); |
8ed67789 | 446 | return (match ? match : net->ipv6.ip6_null_entry); |
1da177e4 LT |
447 | } |
448 | ||
70ceb4f5 YH |
449 | #ifdef CONFIG_IPV6_ROUTE_INFO |
450 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
451 | struct in6_addr *gwaddr) | |
452 | { | |
c346dca1 | 453 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
454 | struct route_info *rinfo = (struct route_info *) opt; |
455 | struct in6_addr prefix_buf, *prefix; | |
456 | unsigned int pref; | |
4bed72e4 | 457 | unsigned long lifetime; |
70ceb4f5 YH |
458 | struct rt6_info *rt; |
459 | ||
460 | if (len < sizeof(struct route_info)) { | |
461 | return -EINVAL; | |
462 | } | |
463 | ||
464 | /* Sanity check for prefix_len and length */ | |
465 | if (rinfo->length > 3) { | |
466 | return -EINVAL; | |
467 | } else if (rinfo->prefix_len > 128) { | |
468 | return -EINVAL; | |
469 | } else if (rinfo->prefix_len > 64) { | |
470 | if (rinfo->length < 2) { | |
471 | return -EINVAL; | |
472 | } | |
473 | } else if (rinfo->prefix_len > 0) { | |
474 | if (rinfo->length < 1) { | |
475 | return -EINVAL; | |
476 | } | |
477 | } | |
478 | ||
479 | pref = rinfo->route_pref; | |
480 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
481 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
482 | ||
4bed72e4 | 483 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
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) { | |
4bed72e4 | 511 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
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; | |
dd3abc4e | 552 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 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 | ||
9acd9f3a YH |
561 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
562 | const 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 = { |
c346dca1 | 613 | .nl_net = dev_net(rt->rt6i_dev), |
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; |
53b7997f | 677 | int reachable = net->ipv6.devconf_all->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); |
c346dca1 | 751 | struct net *net = dev_net(skb->dev); |
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 | ||
4591db4f DL |
778 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
779 | struct flowi *fl) | |
c71099ac TG |
780 | { |
781 | int flags = 0; | |
782 | ||
783 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 784 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 785 | |
adaa70bb TG |
786 | if (!ipv6_addr_any(&fl->fl6_src)) |
787 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
7cbca67c YH |
788 | else if (sk) { |
789 | unsigned int prefs = inet6_sk(sk)->srcprefs; | |
790 | if (prefs & IPV6_PREFER_SRC_TMP) | |
791 | flags |= RT6_LOOKUP_F_SRCPREF_TMP; | |
792 | if (prefs & IPV6_PREFER_SRC_PUBLIC) | |
793 | flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC; | |
794 | if (prefs & IPV6_PREFER_SRC_COA) | |
795 | flags |= RT6_LOOKUP_F_SRCPREF_COA; | |
796 | } | |
adaa70bb | 797 | |
4591db4f | 798 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
799 | } |
800 | ||
7159039a | 801 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 802 | |
14e50e57 DM |
803 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
804 | { | |
805 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
806 | struct rt6_info *rt = (struct rt6_info *) | |
807 | dst_alloc(&ip6_dst_blackhole_ops); | |
808 | struct dst_entry *new = NULL; | |
809 | ||
810 | if (rt) { | |
811 | new = &rt->u.dst; | |
812 | ||
813 | atomic_set(&new->__refcnt, 1); | |
814 | new->__use = 1; | |
352e512c HX |
815 | new->input = dst_discard; |
816 | new->output = dst_discard; | |
14e50e57 DM |
817 | |
818 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
819 | new->dev = ort->u.dst.dev; | |
820 | if (new->dev) | |
821 | dev_hold(new->dev); | |
822 | rt->rt6i_idev = ort->rt6i_idev; | |
823 | if (rt->rt6i_idev) | |
824 | in6_dev_hold(rt->rt6i_idev); | |
825 | rt->rt6i_expires = 0; | |
826 | ||
827 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
828 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
829 | rt->rt6i_metric = 0; | |
830 | ||
831 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
832 | #ifdef CONFIG_IPV6_SUBTREES | |
833 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
834 | #endif | |
835 | ||
836 | dst_free(new); | |
837 | } | |
838 | ||
839 | dst_release(*dstp); | |
840 | *dstp = new; | |
841 | return (new ? 0 : -ENOMEM); | |
842 | } | |
843 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
844 | ||
1da177e4 LT |
845 | /* |
846 | * Destination cache support functions | |
847 | */ | |
848 | ||
849 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
850 | { | |
851 | struct rt6_info *rt; | |
852 | ||
853 | rt = (struct rt6_info *) dst; | |
854 | ||
855 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
856 | return dst; | |
857 | ||
858 | return NULL; | |
859 | } | |
860 | ||
861 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
862 | { | |
863 | struct rt6_info *rt = (struct rt6_info *) dst; | |
864 | ||
865 | if (rt) { | |
866 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 867 | ip6_del_rt(rt); |
1da177e4 LT |
868 | else |
869 | dst_release(dst); | |
870 | } | |
871 | return NULL; | |
872 | } | |
873 | ||
874 | static void ip6_link_failure(struct sk_buff *skb) | |
875 | { | |
876 | struct rt6_info *rt; | |
877 | ||
878 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
879 | ||
880 | rt = (struct rt6_info *) skb->dst; | |
881 | if (rt) { | |
882 | if (rt->rt6i_flags&RTF_CACHE) { | |
883 | dst_set_expires(&rt->u.dst, 0); | |
884 | rt->rt6i_flags |= RTF_EXPIRES; | |
885 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
886 | rt->rt6i_node->fn_sernum = -1; | |
887 | } | |
888 | } | |
889 | ||
890 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
891 | { | |
892 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
893 | ||
894 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
895 | rt6->rt6i_flags |= RTF_MODIFIED; | |
896 | if (mtu < IPV6_MIN_MTU) { | |
897 | mtu = IPV6_MIN_MTU; | |
898 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
899 | } | |
900 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 901 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
902 | } |
903 | } | |
904 | ||
1da177e4 LT |
905 | static int ipv6_get_mtu(struct net_device *dev); |
906 | ||
5578689a | 907 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
908 | { |
909 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
910 | ||
5578689a DL |
911 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
912 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
913 | |
914 | /* | |
1ab1457c YH |
915 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
916 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
917 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
918 | * rely only on pmtu discovery" |
919 | */ | |
920 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
921 | mtu = IPV6_MAXPLEN; | |
922 | return mtu; | |
923 | } | |
924 | ||
3b00944c YH |
925 | static struct dst_entry *icmp6_dst_gc_list; |
926 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 927 | |
3b00944c | 928 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 929 | struct neighbour *neigh, |
9acd9f3a | 930 | const struct in6_addr *addr) |
1da177e4 LT |
931 | { |
932 | struct rt6_info *rt; | |
933 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 934 | struct net *net = dev_net(dev); |
1da177e4 LT |
935 | |
936 | if (unlikely(idev == NULL)) | |
937 | return NULL; | |
938 | ||
f2fc6a54 | 939 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
940 | if (unlikely(rt == NULL)) { |
941 | in6_dev_put(idev); | |
942 | goto out; | |
943 | } | |
944 | ||
945 | dev_hold(dev); | |
946 | if (neigh) | |
947 | neigh_hold(neigh); | |
948 | else | |
949 | neigh = ndisc_get_neigh(dev, addr); | |
950 | ||
951 | rt->rt6i_dev = dev; | |
952 | rt->rt6i_idev = idev; | |
953 | rt->rt6i_nexthop = neigh; | |
954 | atomic_set(&rt->u.dst.__refcnt, 1); | |
955 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
956 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 957 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 958 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
959 | |
960 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
961 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
962 | ? DST_HOST | |
1da177e4 LT |
963 | : 0; |
964 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
965 | rt->rt6i_dst.plen = 128; | |
966 | #endif | |
967 | ||
3b00944c YH |
968 | spin_lock_bh(&icmp6_dst_lock); |
969 | rt->u.dst.next = icmp6_dst_gc_list; | |
970 | icmp6_dst_gc_list = &rt->u.dst; | |
971 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 972 | |
5578689a | 973 | fib6_force_start_gc(net); |
1da177e4 LT |
974 | |
975 | out: | |
40aa7b90 | 976 | return &rt->u.dst; |
1da177e4 LT |
977 | } |
978 | ||
3d0f24a7 | 979 | int icmp6_dst_gc(void) |
1da177e4 LT |
980 | { |
981 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 982 | int more = 0; |
1da177e4 LT |
983 | |
984 | next = NULL; | |
5d0bbeeb | 985 | |
3b00944c YH |
986 | spin_lock_bh(&icmp6_dst_lock); |
987 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 988 | |
1da177e4 LT |
989 | while ((dst = *pprev) != NULL) { |
990 | if (!atomic_read(&dst->__refcnt)) { | |
991 | *pprev = dst->next; | |
992 | dst_free(dst); | |
1da177e4 LT |
993 | } else { |
994 | pprev = &dst->next; | |
3d0f24a7 | 995 | ++more; |
1da177e4 LT |
996 | } |
997 | } | |
998 | ||
3b00944c | 999 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1000 | |
3d0f24a7 | 1001 | return more; |
1da177e4 LT |
1002 | } |
1003 | ||
1e493d19 DM |
1004 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1005 | void *arg) | |
1006 | { | |
1007 | struct dst_entry *dst, **pprev; | |
1008 | ||
1009 | spin_lock_bh(&icmp6_dst_lock); | |
1010 | pprev = &icmp6_dst_gc_list; | |
1011 | while ((dst = *pprev) != NULL) { | |
1012 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1013 | if (func(rt, arg)) { | |
1014 | *pprev = dst->next; | |
1015 | dst_free(dst); | |
1016 | } else { | |
1017 | pprev = &dst->next; | |
1018 | } | |
1019 | } | |
1020 | spin_unlock_bh(&icmp6_dst_lock); | |
1021 | } | |
1022 | ||
569d3645 | 1023 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1024 | { |
1da177e4 | 1025 | unsigned long now = jiffies; |
7019b78e DL |
1026 | struct net *net = ops->dst_net; |
1027 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
1028 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1029 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1030 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1031 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1032 | ||
1033 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1034 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1035 | goto out; |
1036 | ||
6891a346 BT |
1037 | net->ipv6.ip6_rt_gc_expire++; |
1038 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1039 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1040 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1041 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1042 | out: |
7019b78e DL |
1043 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1044 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1048 | but results in cleaner routing tables. | |
1049 | ||
1050 | Remove it only when all the things will work! | |
1051 | */ | |
1052 | ||
1053 | static int ipv6_get_mtu(struct net_device *dev) | |
1054 | { | |
1055 | int mtu = IPV6_MIN_MTU; | |
1056 | struct inet6_dev *idev; | |
1057 | ||
1058 | idev = in6_dev_get(dev); | |
1059 | if (idev) { | |
1060 | mtu = idev->cnf.mtu6; | |
1061 | in6_dev_put(idev); | |
1062 | } | |
1063 | return mtu; | |
1064 | } | |
1065 | ||
6b75d090 | 1066 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1067 | { |
6b75d090 YH |
1068 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1069 | if (hoplimit < 0) { | |
1070 | struct net_device *dev = dst->dev; | |
1071 | struct inet6_dev *idev = in6_dev_get(dev); | |
1072 | if (idev) { | |
1073 | hoplimit = idev->cnf.hop_limit; | |
1074 | in6_dev_put(idev); | |
1075 | } else | |
53b7997f | 1076 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
1da177e4 LT |
1077 | } |
1078 | return hoplimit; | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * | |
1083 | */ | |
1084 | ||
86872cb5 | 1085 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1086 | { |
1087 | int err; | |
5578689a | 1088 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1089 | struct rt6_info *rt = NULL; |
1090 | struct net_device *dev = NULL; | |
1091 | struct inet6_dev *idev = NULL; | |
c71099ac | 1092 | struct fib6_table *table; |
1da177e4 LT |
1093 | int addr_type; |
1094 | ||
86872cb5 | 1095 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1096 | return -EINVAL; |
1097 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1098 | if (cfg->fc_src_len) |
1da177e4 LT |
1099 | return -EINVAL; |
1100 | #endif | |
86872cb5 | 1101 | if (cfg->fc_ifindex) { |
1da177e4 | 1102 | err = -ENODEV; |
5578689a | 1103 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1104 | if (!dev) |
1105 | goto out; | |
1106 | idev = in6_dev_get(dev); | |
1107 | if (!idev) | |
1108 | goto out; | |
1109 | } | |
1110 | ||
86872cb5 TG |
1111 | if (cfg->fc_metric == 0) |
1112 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1113 | |
5578689a | 1114 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1115 | if (table == NULL) { |
1116 | err = -ENOBUFS; | |
1117 | goto out; | |
1118 | } | |
1119 | ||
f2fc6a54 | 1120 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1121 | |
1122 | if (rt == NULL) { | |
1123 | err = -ENOMEM; | |
1124 | goto out; | |
1125 | } | |
1126 | ||
1127 | rt->u.dst.obsolete = -1; | |
6f704992 YH |
1128 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1129 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1130 | 0; | |
1da177e4 | 1131 | |
86872cb5 TG |
1132 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1133 | cfg->fc_protocol = RTPROT_BOOT; | |
1134 | rt->rt6i_protocol = cfg->fc_protocol; | |
1135 | ||
1136 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1137 | |
1138 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1139 | rt->u.dst.input = ip6_mc_input; | |
1140 | else | |
1141 | rt->u.dst.input = ip6_forward; | |
1142 | ||
1143 | rt->u.dst.output = ip6_output; | |
1144 | ||
86872cb5 TG |
1145 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1146 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1147 | if (rt->rt6i_dst.plen == 128) |
1148 | rt->u.dst.flags = DST_HOST; | |
1149 | ||
1150 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1151 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1152 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1153 | #endif |
1154 | ||
86872cb5 | 1155 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1156 | |
1157 | /* We cannot add true routes via loopback here, | |
1158 | they would result in kernel looping; promote them to reject routes | |
1159 | */ | |
86872cb5 | 1160 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1161 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1162 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1163 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1164 | if (dev) { |
1165 | dev_put(dev); | |
1166 | in6_dev_put(idev); | |
1167 | } | |
5578689a | 1168 | dev = net->loopback_dev; |
1da177e4 LT |
1169 | dev_hold(dev); |
1170 | idev = in6_dev_get(dev); | |
1171 | if (!idev) { | |
1172 | err = -ENODEV; | |
1173 | goto out; | |
1174 | } | |
1175 | } | |
1176 | rt->u.dst.output = ip6_pkt_discard_out; | |
1177 | rt->u.dst.input = ip6_pkt_discard; | |
1178 | rt->u.dst.error = -ENETUNREACH; | |
1179 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1180 | goto install_route; | |
1181 | } | |
1182 | ||
86872cb5 | 1183 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1184 | struct in6_addr *gw_addr; |
1185 | int gwa_type; | |
1186 | ||
86872cb5 TG |
1187 | gw_addr = &cfg->fc_gateway; |
1188 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1189 | gwa_type = ipv6_addr_type(gw_addr); |
1190 | ||
1191 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1192 | struct rt6_info *grt; | |
1193 | ||
1194 | /* IPv6 strictly inhibits using not link-local | |
1195 | addresses as nexthop address. | |
1196 | Otherwise, router will not able to send redirects. | |
1197 | It is very good, but in some (rare!) circumstances | |
1198 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1199 | some exceptions. --ANK | |
1200 | */ | |
1201 | err = -EINVAL; | |
1202 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1203 | goto out; | |
1204 | ||
5578689a | 1205 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1206 | |
1207 | err = -EHOSTUNREACH; | |
1208 | if (grt == NULL) | |
1209 | goto out; | |
1210 | if (dev) { | |
1211 | if (dev != grt->rt6i_dev) { | |
1212 | dst_release(&grt->u.dst); | |
1213 | goto out; | |
1214 | } | |
1215 | } else { | |
1216 | dev = grt->rt6i_dev; | |
1217 | idev = grt->rt6i_idev; | |
1218 | dev_hold(dev); | |
1219 | in6_dev_hold(grt->rt6i_idev); | |
1220 | } | |
1221 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1222 | err = 0; | |
1223 | dst_release(&grt->u.dst); | |
1224 | ||
1225 | if (err) | |
1226 | goto out; | |
1227 | } | |
1228 | err = -EINVAL; | |
1229 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1230 | goto out; | |
1231 | } | |
1232 | ||
1233 | err = -ENODEV; | |
1234 | if (dev == NULL) | |
1235 | goto out; | |
1236 | ||
86872cb5 | 1237 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1238 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1239 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1240 | err = PTR_ERR(rt->rt6i_nexthop); | |
1241 | rt->rt6i_nexthop = NULL; | |
1242 | goto out; | |
1243 | } | |
1244 | } | |
1245 | ||
86872cb5 | 1246 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1247 | |
1248 | install_route: | |
86872cb5 TG |
1249 | if (cfg->fc_mx) { |
1250 | struct nlattr *nla; | |
1251 | int remaining; | |
1252 | ||
1253 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1254 | int type = nla_type(nla); |
86872cb5 TG |
1255 | |
1256 | if (type) { | |
1257 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1258 | err = -EINVAL; |
1259 | goto out; | |
1260 | } | |
86872cb5 TG |
1261 | |
1262 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1263 | } |
1da177e4 LT |
1264 | } |
1265 | } | |
1266 | ||
5ffc02a1 | 1267 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1268 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1ca615fb | 1269 | if (!dst_mtu(&rt->u.dst)) |
1da177e4 | 1270 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
5ffc02a1 | 1271 | if (!dst_metric(&rt->u.dst, RTAX_ADVMSS)) |
5578689a | 1272 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1273 | rt->u.dst.dev = dev; |
1274 | rt->rt6i_idev = idev; | |
c71099ac | 1275 | rt->rt6i_table = table; |
63152fc0 | 1276 | |
c346dca1 | 1277 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1278 | |
86872cb5 | 1279 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1280 | |
1281 | out: | |
1282 | if (dev) | |
1283 | dev_put(dev); | |
1284 | if (idev) | |
1285 | in6_dev_put(idev); | |
1286 | if (rt) | |
40aa7b90 | 1287 | dst_free(&rt->u.dst); |
1da177e4 LT |
1288 | return err; |
1289 | } | |
1290 | ||
86872cb5 | 1291 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1292 | { |
1293 | int err; | |
c71099ac | 1294 | struct fib6_table *table; |
c346dca1 | 1295 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1296 | |
8ed67789 | 1297 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1298 | return -ENOENT; |
1299 | ||
c71099ac TG |
1300 | table = rt->rt6i_table; |
1301 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1302 | |
86872cb5 | 1303 | err = fib6_del(rt, info); |
1da177e4 LT |
1304 | dst_release(&rt->u.dst); |
1305 | ||
c71099ac | 1306 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1307 | |
1308 | return err; | |
1309 | } | |
1310 | ||
e0a1ad73 TG |
1311 | int ip6_del_rt(struct rt6_info *rt) |
1312 | { | |
4d1169c1 | 1313 | struct nl_info info = { |
c346dca1 | 1314 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1315 | }; |
528c4ceb | 1316 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1317 | } |
1318 | ||
86872cb5 | 1319 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1320 | { |
c71099ac | 1321 | struct fib6_table *table; |
1da177e4 LT |
1322 | struct fib6_node *fn; |
1323 | struct rt6_info *rt; | |
1324 | int err = -ESRCH; | |
1325 | ||
5578689a | 1326 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1327 | if (table == NULL) |
1328 | return err; | |
1329 | ||
1330 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1331 | |
c71099ac | 1332 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1333 | &cfg->fc_dst, cfg->fc_dst_len, |
1334 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1335 | |
1da177e4 | 1336 | if (fn) { |
7cc48263 | 1337 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1338 | if (cfg->fc_ifindex && |
1da177e4 | 1339 | (rt->rt6i_dev == NULL || |
86872cb5 | 1340 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1341 | continue; |
86872cb5 TG |
1342 | if (cfg->fc_flags & RTF_GATEWAY && |
1343 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1344 | continue; |
86872cb5 | 1345 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1346 | continue; |
1347 | dst_hold(&rt->u.dst); | |
c71099ac | 1348 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1349 | |
86872cb5 | 1350 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1351 | } |
1352 | } | |
c71099ac | 1353 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1354 | |
1355 | return err; | |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * Handle redirects | |
1360 | */ | |
a6279458 YH |
1361 | struct ip6rd_flowi { |
1362 | struct flowi fl; | |
1363 | struct in6_addr gateway; | |
1364 | }; | |
1365 | ||
8ed67789 DL |
1366 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1367 | struct fib6_table *table, | |
a6279458 YH |
1368 | struct flowi *fl, |
1369 | int flags) | |
1da177e4 | 1370 | { |
a6279458 YH |
1371 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1372 | struct rt6_info *rt; | |
e843b9e1 | 1373 | struct fib6_node *fn; |
c71099ac | 1374 | |
1da177e4 | 1375 | /* |
e843b9e1 YH |
1376 | * Get the "current" route for this destination and |
1377 | * check if the redirect has come from approriate router. | |
1378 | * | |
1379 | * RFC 2461 specifies that redirects should only be | |
1380 | * accepted if they come from the nexthop to the target. | |
1381 | * Due to the way the routes are chosen, this notion | |
1382 | * is a bit fuzzy and one might need to check all possible | |
1383 | * routes. | |
1da177e4 | 1384 | */ |
1da177e4 | 1385 | |
c71099ac | 1386 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1387 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1388 | restart: |
7cc48263 | 1389 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1390 | /* |
1391 | * Current route is on-link; redirect is always invalid. | |
1392 | * | |
1393 | * Seems, previous statement is not true. It could | |
1394 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1395 | * But then router serving it might decide, that we should | |
1396 | * know truth 8)8) --ANK (980726). | |
1397 | */ | |
1398 | if (rt6_check_expired(rt)) | |
1399 | continue; | |
1400 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1401 | continue; | |
a6279458 | 1402 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1403 | continue; |
a6279458 | 1404 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1405 | continue; |
1406 | break; | |
1407 | } | |
a6279458 | 1408 | |
cb15d9c2 | 1409 | if (!rt) |
8ed67789 DL |
1410 | rt = net->ipv6.ip6_null_entry; |
1411 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1412 | out: |
a6279458 YH |
1413 | dst_hold(&rt->u.dst); |
1414 | ||
c71099ac | 1415 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1416 | |
a6279458 YH |
1417 | return rt; |
1418 | }; | |
1419 | ||
1420 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1421 | struct in6_addr *src, | |
1422 | struct in6_addr *gateway, | |
1423 | struct net_device *dev) | |
1424 | { | |
adaa70bb | 1425 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1426 | struct net *net = dev_net(dev); |
a6279458 YH |
1427 | struct ip6rd_flowi rdfl = { |
1428 | .fl = { | |
1429 | .oif = dev->ifindex, | |
1430 | .nl_u = { | |
1431 | .ip6_u = { | |
1432 | .daddr = *dest, | |
1433 | .saddr = *src, | |
1434 | }, | |
1435 | }, | |
1436 | }, | |
1437 | .gateway = *gateway, | |
1438 | }; | |
adaa70bb TG |
1439 | |
1440 | if (rt6_need_strict(dest)) | |
1441 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1442 | |
5578689a | 1443 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1444 | flags, __ip6_route_redirect); |
a6279458 YH |
1445 | } |
1446 | ||
1447 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1448 | struct in6_addr *saddr, | |
1449 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1450 | { | |
1451 | struct rt6_info *rt, *nrt = NULL; | |
1452 | struct netevent_redirect netevent; | |
c346dca1 | 1453 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1454 | |
1455 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1456 | ||
8ed67789 | 1457 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1458 | if (net_ratelimit()) |
1459 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1460 | "for redirect target\n"); | |
a6279458 | 1461 | goto out; |
1da177e4 LT |
1462 | } |
1463 | ||
1da177e4 LT |
1464 | /* |
1465 | * We have finally decided to accept it. | |
1466 | */ | |
1467 | ||
1ab1457c | 1468 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1469 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1470 | NEIGH_UPDATE_F_OVERRIDE| | |
1471 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1472 | NEIGH_UPDATE_F_ISROUTER)) | |
1473 | ); | |
1474 | ||
1475 | /* | |
1476 | * Redirect received -> path was valid. | |
1477 | * Look, redirects are sent only in response to data packets, | |
1478 | * so that this nexthop apparently is reachable. --ANK | |
1479 | */ | |
1480 | dst_confirm(&rt->u.dst); | |
1481 | ||
1482 | /* Duplicate redirect: silently ignore. */ | |
1483 | if (neigh == rt->u.dst.neighbour) | |
1484 | goto out; | |
1485 | ||
1486 | nrt = ip6_rt_copy(rt); | |
1487 | if (nrt == NULL) | |
1488 | goto out; | |
1489 | ||
1490 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1491 | if (on_link) | |
1492 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1493 | ||
1494 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1495 | nrt->rt6i_dst.plen = 128; | |
1496 | nrt->u.dst.flags |= DST_HOST; | |
1497 | ||
1498 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1499 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1500 | /* Reset pmtu, it may be better */ | |
1501 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
c346dca1 | 1502 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), |
5578689a | 1503 | dst_mtu(&nrt->u.dst)); |
1da177e4 | 1504 | |
40e22e8f | 1505 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1506 | goto out; |
1507 | ||
8d71740c TT |
1508 | netevent.old = &rt->u.dst; |
1509 | netevent.new = &nrt->u.dst; | |
1510 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1511 | ||
1da177e4 | 1512 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1513 | ip6_del_rt(rt); |
1da177e4 LT |
1514 | return; |
1515 | } | |
1516 | ||
1517 | out: | |
1ab1457c | 1518 | dst_release(&rt->u.dst); |
1da177e4 LT |
1519 | return; |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Handle ICMP "packet too big" messages | |
1524 | * i.e. Path MTU discovery | |
1525 | */ | |
1526 | ||
1527 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1528 | struct net_device *dev, u32 pmtu) | |
1529 | { | |
1530 | struct rt6_info *rt, *nrt; | |
c346dca1 | 1531 | struct net *net = dev_net(dev); |
1da177e4 LT |
1532 | int allfrag = 0; |
1533 | ||
5578689a | 1534 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1535 | if (rt == NULL) |
1536 | return; | |
1537 | ||
1538 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1539 | goto out; | |
1540 | ||
1541 | if (pmtu < IPV6_MIN_MTU) { | |
1542 | /* | |
1ab1457c | 1543 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1544 | * MTU (1280) and a fragment header should always be included |
1545 | * after a node receiving Too Big message reporting PMTU is | |
1546 | * less than the IPv6 Minimum Link MTU. | |
1547 | */ | |
1548 | pmtu = IPV6_MIN_MTU; | |
1549 | allfrag = 1; | |
1550 | } | |
1551 | ||
1552 | /* New mtu received -> path was valid. | |
1553 | They are sent only in response to data packets, | |
1554 | so that this nexthop apparently is reachable. --ANK | |
1555 | */ | |
1556 | dst_confirm(&rt->u.dst); | |
1557 | ||
1558 | /* Host route. If it is static, it would be better | |
1559 | not to override it, but add new one, so that | |
1560 | when cache entry will expire old pmtu | |
1561 | would return automatically. | |
1562 | */ | |
1563 | if (rt->rt6i_flags & RTF_CACHE) { | |
1564 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1565 | if (allfrag) | |
1566 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1567 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1568 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1569 | goto out; | |
1570 | } | |
1571 | ||
1572 | /* Network route. | |
1573 | Two cases are possible: | |
1574 | 1. It is connected route. Action: COW | |
1575 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1576 | */ | |
d5315b50 | 1577 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1578 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1579 | else |
1580 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1581 | |
d5315b50 | 1582 | if (nrt) { |
a1e78363 YH |
1583 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1584 | if (allfrag) | |
1585 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1586 | ||
1587 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1588 | * happened within 5 mins, the recommended timer is 10 mins. | |
1589 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1590 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1591 | * and detecting PMTU increase will be automatically happened. | |
1592 | */ | |
5578689a | 1593 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1594 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1595 | ||
40e22e8f | 1596 | ip6_ins_rt(nrt); |
1da177e4 | 1597 | } |
1da177e4 LT |
1598 | out: |
1599 | dst_release(&rt->u.dst); | |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * Misc support functions | |
1604 | */ | |
1605 | ||
1606 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1607 | { | |
c346dca1 | 1608 | struct net *net = dev_net(ort->rt6i_dev); |
f2fc6a54 | 1609 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1610 | |
1611 | if (rt) { | |
1612 | rt->u.dst.input = ort->u.dst.input; | |
1613 | rt->u.dst.output = ort->u.dst.output; | |
1614 | ||
1615 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1616 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1617 | rt->u.dst.dev = ort->u.dst.dev; |
1618 | if (rt->u.dst.dev) | |
1619 | dev_hold(rt->u.dst.dev); | |
1620 | rt->rt6i_idev = ort->rt6i_idev; | |
1621 | if (rt->rt6i_idev) | |
1622 | in6_dev_hold(rt->rt6i_idev); | |
1623 | rt->u.dst.lastuse = jiffies; | |
1624 | rt->rt6i_expires = 0; | |
1625 | ||
1626 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1627 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1628 | rt->rt6i_metric = 0; | |
1629 | ||
1630 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1631 | #ifdef CONFIG_IPV6_SUBTREES | |
1632 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1633 | #endif | |
c71099ac | 1634 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1635 | } |
1636 | return rt; | |
1637 | } | |
1638 | ||
70ceb4f5 | 1639 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1640 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1641 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1642 | struct in6_addr *gwaddr, int ifindex) |
1643 | { | |
1644 | struct fib6_node *fn; | |
1645 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1646 | struct fib6_table *table; |
1647 | ||
efa2cea0 | 1648 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1649 | if (table == NULL) |
1650 | return NULL; | |
70ceb4f5 | 1651 | |
c71099ac TG |
1652 | write_lock_bh(&table->tb6_lock); |
1653 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1654 | if (!fn) |
1655 | goto out; | |
1656 | ||
7cc48263 | 1657 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1658 | if (rt->rt6i_dev->ifindex != ifindex) |
1659 | continue; | |
1660 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1661 | continue; | |
1662 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1663 | continue; | |
1664 | dst_hold(&rt->u.dst); | |
1665 | break; | |
1666 | } | |
1667 | out: | |
c71099ac | 1668 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1669 | return rt; |
1670 | } | |
1671 | ||
efa2cea0 DL |
1672 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1673 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1674 | struct in6_addr *gwaddr, int ifindex, |
1675 | unsigned pref) | |
1676 | { | |
86872cb5 TG |
1677 | struct fib6_config cfg = { |
1678 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1679 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1680 | .fc_ifindex = ifindex, |
1681 | .fc_dst_len = prefixlen, | |
1682 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1683 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1684 | .fc_nlinfo.pid = 0, |
1685 | .fc_nlinfo.nlh = NULL, | |
1686 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1687 | }; |
1688 | ||
1689 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1690 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1691 | |
e317da96 YH |
1692 | /* We should treat it as a default route if prefix length is 0. */ |
1693 | if (!prefixlen) | |
86872cb5 | 1694 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1695 | |
86872cb5 | 1696 | ip6_route_add(&cfg); |
70ceb4f5 | 1697 | |
efa2cea0 | 1698 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1699 | } |
1700 | #endif | |
1701 | ||
1da177e4 | 1702 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1703 | { |
1da177e4 | 1704 | struct rt6_info *rt; |
c71099ac | 1705 | struct fib6_table *table; |
1da177e4 | 1706 | |
c346dca1 | 1707 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1708 | if (table == NULL) |
1709 | return NULL; | |
1da177e4 | 1710 | |
c71099ac | 1711 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1712 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1713 | if (dev == rt->rt6i_dev && |
045927ff | 1714 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1715 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1716 | break; | |
1717 | } | |
1718 | if (rt) | |
1719 | dst_hold(&rt->u.dst); | |
c71099ac | 1720 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1721 | return rt; |
1722 | } | |
1723 | ||
1724 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1725 | struct net_device *dev, |
1726 | unsigned int pref) | |
1da177e4 | 1727 | { |
86872cb5 TG |
1728 | struct fib6_config cfg = { |
1729 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1730 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1731 | .fc_ifindex = dev->ifindex, |
1732 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1733 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1734 | .fc_nlinfo.pid = 0, |
1735 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1736 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1737 | }; |
1da177e4 | 1738 | |
86872cb5 | 1739 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1740 | |
86872cb5 | 1741 | ip6_route_add(&cfg); |
1da177e4 | 1742 | |
1da177e4 LT |
1743 | return rt6_get_dflt_router(gwaddr, dev); |
1744 | } | |
1745 | ||
7b4da532 | 1746 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1747 | { |
1748 | struct rt6_info *rt; | |
c71099ac TG |
1749 | struct fib6_table *table; |
1750 | ||
1751 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1752 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1753 | if (table == NULL) |
1754 | return; | |
1da177e4 LT |
1755 | |
1756 | restart: | |
c71099ac | 1757 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1758 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1759 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1760 | dst_hold(&rt->u.dst); | |
c71099ac | 1761 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1762 | ip6_del_rt(rt); |
1da177e4 LT |
1763 | goto restart; |
1764 | } | |
1765 | } | |
c71099ac | 1766 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1767 | } |
1768 | ||
5578689a DL |
1769 | static void rtmsg_to_fib6_config(struct net *net, |
1770 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1771 | struct fib6_config *cfg) |
1772 | { | |
1773 | memset(cfg, 0, sizeof(*cfg)); | |
1774 | ||
1775 | cfg->fc_table = RT6_TABLE_MAIN; | |
1776 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1777 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1778 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1779 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1780 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1781 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1782 | ||
5578689a | 1783 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1784 | |
86872cb5 TG |
1785 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1786 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1787 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1788 | } | |
1789 | ||
5578689a | 1790 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1791 | { |
86872cb5 | 1792 | struct fib6_config cfg; |
1da177e4 LT |
1793 | struct in6_rtmsg rtmsg; |
1794 | int err; | |
1795 | ||
1796 | switch(cmd) { | |
1797 | case SIOCADDRT: /* Add a route */ | |
1798 | case SIOCDELRT: /* Delete a route */ | |
1799 | if (!capable(CAP_NET_ADMIN)) | |
1800 | return -EPERM; | |
1801 | err = copy_from_user(&rtmsg, arg, | |
1802 | sizeof(struct in6_rtmsg)); | |
1803 | if (err) | |
1804 | return -EFAULT; | |
86872cb5 | 1805 | |
5578689a | 1806 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1807 | |
1da177e4 LT |
1808 | rtnl_lock(); |
1809 | switch (cmd) { | |
1810 | case SIOCADDRT: | |
86872cb5 | 1811 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1812 | break; |
1813 | case SIOCDELRT: | |
86872cb5 | 1814 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1815 | break; |
1816 | default: | |
1817 | err = -EINVAL; | |
1818 | } | |
1819 | rtnl_unlock(); | |
1820 | ||
1821 | return err; | |
3ff50b79 | 1822 | } |
1da177e4 LT |
1823 | |
1824 | return -EINVAL; | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * Drop the packet on the floor | |
1829 | */ | |
1830 | ||
50eb431d | 1831 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1832 | { |
612f09e8 | 1833 | int type; |
3bd653c8 | 1834 | struct dst_entry *dst = skb->dst; |
612f09e8 YH |
1835 | switch (ipstats_mib_noroutes) { |
1836 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1837 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 | 1838 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
3bd653c8 DL |
1839 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1840 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1841 | break; |
1842 | } | |
1843 | /* FALLTHROUGH */ | |
1844 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1845 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1846 | ipstats_mib_noroutes); | |
612f09e8 YH |
1847 | break; |
1848 | } | |
9ce8ade0 | 1849 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1850 | kfree_skb(skb); |
1851 | return 0; | |
1852 | } | |
1853 | ||
9ce8ade0 TG |
1854 | static int ip6_pkt_discard(struct sk_buff *skb) |
1855 | { | |
612f09e8 | 1856 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1857 | } |
1858 | ||
20380731 | 1859 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1860 | { |
1861 | skb->dev = skb->dst->dev; | |
612f09e8 | 1862 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1863 | } |
1864 | ||
6723ab54 DM |
1865 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1866 | ||
9ce8ade0 TG |
1867 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1868 | { | |
612f09e8 | 1869 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1870 | } |
1871 | ||
1872 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1873 | { | |
1874 | skb->dev = skb->dst->dev; | |
612f09e8 | 1875 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1876 | } |
1877 | ||
6723ab54 DM |
1878 | #endif |
1879 | ||
1da177e4 LT |
1880 | /* |
1881 | * Allocate a dst for local (unicast / anycast) address. | |
1882 | */ | |
1883 | ||
1884 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1885 | const struct in6_addr *addr, | |
1886 | int anycast) | |
1887 | { | |
c346dca1 | 1888 | struct net *net = dev_net(idev->dev); |
f2fc6a54 | 1889 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1890 | |
1891 | if (rt == NULL) | |
1892 | return ERR_PTR(-ENOMEM); | |
1893 | ||
5578689a | 1894 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1895 | in6_dev_hold(idev); |
1896 | ||
1897 | rt->u.dst.flags = DST_HOST; | |
1898 | rt->u.dst.input = ip6_input; | |
1899 | rt->u.dst.output = ip6_output; | |
5578689a | 1900 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1901 | rt->rt6i_idev = idev; |
1902 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1903 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1904 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1905 | rt->u.dst.obsolete = -1; | |
1906 | ||
1907 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1908 | if (anycast) |
1909 | rt->rt6i_flags |= RTF_ANYCAST; | |
1910 | else | |
1da177e4 LT |
1911 | rt->rt6i_flags |= RTF_LOCAL; |
1912 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1913 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1914 | dst_free(&rt->u.dst); |
1da177e4 LT |
1915 | return ERR_PTR(-ENOMEM); |
1916 | } | |
1917 | ||
1918 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1919 | rt->rt6i_dst.plen = 128; | |
5578689a | 1920 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1921 | |
1922 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1923 | ||
1924 | return rt; | |
1925 | } | |
1926 | ||
8ed67789 DL |
1927 | struct arg_dev_net { |
1928 | struct net_device *dev; | |
1929 | struct net *net; | |
1930 | }; | |
1931 | ||
1da177e4 LT |
1932 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1933 | { | |
8ed67789 DL |
1934 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1935 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1936 | ||
1937 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1938 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1939 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1940 | return -1; | |
1941 | } | |
1942 | return 0; | |
1943 | } | |
1944 | ||
f3db4851 | 1945 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1946 | { |
8ed67789 DL |
1947 | struct arg_dev_net adn = { |
1948 | .dev = dev, | |
1949 | .net = net, | |
1950 | }; | |
1951 | ||
1952 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 1953 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
1954 | } |
1955 | ||
1956 | struct rt6_mtu_change_arg | |
1957 | { | |
1958 | struct net_device *dev; | |
1959 | unsigned mtu; | |
1960 | }; | |
1961 | ||
1962 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1963 | { | |
1964 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1965 | struct inet6_dev *idev; | |
c346dca1 | 1966 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
1967 | |
1968 | /* In IPv6 pmtu discovery is not optional, | |
1969 | so that RTAX_MTU lock cannot disable it. | |
1970 | We still use this lock to block changes | |
1971 | caused by addrconf/ndisc. | |
1972 | */ | |
1973 | ||
1974 | idev = __in6_dev_get(arg->dev); | |
1975 | if (idev == NULL) | |
1976 | return 0; | |
1977 | ||
1978 | /* For administrative MTU increase, there is no way to discover | |
1979 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1980 | Since RFC 1981 doesn't include administrative MTU increase | |
1981 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1982 | */ | |
1983 | /* | |
1984 | If new MTU is less than route PMTU, this new MTU will be the | |
1985 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1986 | decreases; if new MTU is greater than route PMTU, and the | |
1987 | old MTU is the lowest MTU in the path, update the route PMTU | |
1988 | to reflect the increase. In this case if the other nodes' MTU | |
1989 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1990 | PMTU discouvery. | |
1991 | */ | |
1992 | if (rt->rt6i_dev == arg->dev && | |
1993 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1994 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1995 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1996 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1997 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 1998 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 1999 | } |
1da177e4 LT |
2000 | return 0; |
2001 | } | |
2002 | ||
2003 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2004 | { | |
c71099ac TG |
2005 | struct rt6_mtu_change_arg arg = { |
2006 | .dev = dev, | |
2007 | .mtu = mtu, | |
2008 | }; | |
1da177e4 | 2009 | |
c346dca1 | 2010 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2011 | } |
2012 | ||
ef7c79ed | 2013 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2014 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2015 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2016 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2017 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2018 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2019 | }; | |
2020 | ||
2021 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2022 | struct fib6_config *cfg) | |
1da177e4 | 2023 | { |
86872cb5 TG |
2024 | struct rtmsg *rtm; |
2025 | struct nlattr *tb[RTA_MAX+1]; | |
2026 | int err; | |
1da177e4 | 2027 | |
86872cb5 TG |
2028 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2029 | if (err < 0) | |
2030 | goto errout; | |
1da177e4 | 2031 | |
86872cb5 TG |
2032 | err = -EINVAL; |
2033 | rtm = nlmsg_data(nlh); | |
2034 | memset(cfg, 0, sizeof(*cfg)); | |
2035 | ||
2036 | cfg->fc_table = rtm->rtm_table; | |
2037 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2038 | cfg->fc_src_len = rtm->rtm_src_len; | |
2039 | cfg->fc_flags = RTF_UP; | |
2040 | cfg->fc_protocol = rtm->rtm_protocol; | |
2041 | ||
2042 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2043 | cfg->fc_flags |= RTF_REJECT; | |
2044 | ||
2045 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2046 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2047 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2048 | |
2049 | if (tb[RTA_GATEWAY]) { | |
2050 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2051 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2052 | } |
86872cb5 TG |
2053 | |
2054 | if (tb[RTA_DST]) { | |
2055 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2056 | ||
2057 | if (nla_len(tb[RTA_DST]) < plen) | |
2058 | goto errout; | |
2059 | ||
2060 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2061 | } |
86872cb5 TG |
2062 | |
2063 | if (tb[RTA_SRC]) { | |
2064 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2065 | ||
2066 | if (nla_len(tb[RTA_SRC]) < plen) | |
2067 | goto errout; | |
2068 | ||
2069 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2070 | } |
86872cb5 TG |
2071 | |
2072 | if (tb[RTA_OIF]) | |
2073 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2074 | ||
2075 | if (tb[RTA_PRIORITY]) | |
2076 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2077 | ||
2078 | if (tb[RTA_METRICS]) { | |
2079 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2080 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2081 | } |
86872cb5 TG |
2082 | |
2083 | if (tb[RTA_TABLE]) | |
2084 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2085 | ||
2086 | err = 0; | |
2087 | errout: | |
2088 | return err; | |
1da177e4 LT |
2089 | } |
2090 | ||
c127ea2c | 2091 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2092 | { |
86872cb5 TG |
2093 | struct fib6_config cfg; |
2094 | int err; | |
1da177e4 | 2095 | |
86872cb5 TG |
2096 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2097 | if (err < 0) | |
2098 | return err; | |
2099 | ||
2100 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2101 | } |
2102 | ||
c127ea2c | 2103 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2104 | { |
86872cb5 TG |
2105 | struct fib6_config cfg; |
2106 | int err; | |
1da177e4 | 2107 | |
86872cb5 TG |
2108 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2109 | if (err < 0) | |
2110 | return err; | |
2111 | ||
2112 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2113 | } |
2114 | ||
339bf98f TG |
2115 | static inline size_t rt6_nlmsg_size(void) |
2116 | { | |
2117 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2118 | + nla_total_size(16) /* RTA_SRC */ | |
2119 | + nla_total_size(16) /* RTA_DST */ | |
2120 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2121 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2122 | + nla_total_size(4) /* RTA_TABLE */ | |
2123 | + nla_total_size(4) /* RTA_IIF */ | |
2124 | + nla_total_size(4) /* RTA_OIF */ | |
2125 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2126 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2127 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2128 | } | |
2129 | ||
191cd582 BH |
2130 | static int rt6_fill_node(struct net *net, |
2131 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2132 | struct in6_addr *dst, struct in6_addr *src, |
2133 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2134 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2135 | { |
2136 | struct rtmsg *rtm; | |
2d7202bf | 2137 | struct nlmsghdr *nlh; |
e3703b3d | 2138 | long expires; |
9e762a4a | 2139 | u32 table; |
1da177e4 LT |
2140 | |
2141 | if (prefix) { /* user wants prefix routes only */ | |
2142 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2143 | /* success since this is not a prefix route */ | |
2144 | return 1; | |
2145 | } | |
2146 | } | |
2147 | ||
2d7202bf TG |
2148 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2149 | if (nlh == NULL) | |
26932566 | 2150 | return -EMSGSIZE; |
2d7202bf TG |
2151 | |
2152 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2153 | rtm->rtm_family = AF_INET6; |
2154 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2155 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2156 | rtm->rtm_tos = 0; | |
c71099ac | 2157 | if (rt->rt6i_table) |
9e762a4a | 2158 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2159 | else |
9e762a4a PM |
2160 | table = RT6_TABLE_UNSPEC; |
2161 | rtm->rtm_table = table; | |
2d7202bf | 2162 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2163 | if (rt->rt6i_flags&RTF_REJECT) |
2164 | rtm->rtm_type = RTN_UNREACHABLE; | |
2165 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2166 | rtm->rtm_type = RTN_LOCAL; | |
2167 | else | |
2168 | rtm->rtm_type = RTN_UNICAST; | |
2169 | rtm->rtm_flags = 0; | |
2170 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2171 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2172 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2173 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2174 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2175 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2176 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2177 | rtm->rtm_protocol = RTPROT_RA; | |
2178 | ||
2179 | if (rt->rt6i_flags&RTF_CACHE) | |
2180 | rtm->rtm_flags |= RTM_F_CLONED; | |
2181 | ||
2182 | if (dst) { | |
2d7202bf | 2183 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2184 | rtm->rtm_dst_len = 128; |
1da177e4 | 2185 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2186 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2187 | #ifdef CONFIG_IPV6_SUBTREES |
2188 | if (src) { | |
2d7202bf | 2189 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2190 | rtm->rtm_src_len = 128; |
1da177e4 | 2191 | } else if (rtm->rtm_src_len) |
2d7202bf | 2192 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2193 | #endif |
7bc570c8 YH |
2194 | if (iif) { |
2195 | #ifdef CONFIG_IPV6_MROUTE | |
2196 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
2197 | int err = ip6mr_get_route(skb, rtm, nowait); | |
2198 | if (err <= 0) { | |
2199 | if (!nowait) { | |
2200 | if (err == 0) | |
2201 | return 0; | |
2202 | goto nla_put_failure; | |
2203 | } else { | |
2204 | if (err == -EMSGSIZE) | |
2205 | goto nla_put_failure; | |
2206 | } | |
2207 | } | |
2208 | } else | |
2209 | #endif | |
2210 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2211 | } else if (dst) { | |
5e0115e5 | 2212 | struct inet6_dev *idev = ip6_dst_idev(&rt->u.dst); |
1da177e4 | 2213 | struct in6_addr saddr_buf; |
191cd582 | 2214 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2215 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2216 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2217 | } |
2d7202bf | 2218 | |
1da177e4 | 2219 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2220 | goto nla_put_failure; |
2221 | ||
1da177e4 | 2222 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2223 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2224 | ||
1da177e4 | 2225 | if (rt->u.dst.dev) |
2d7202bf TG |
2226 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2227 | ||
2228 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2229 | |
36e3deae YH |
2230 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2231 | expires = 0; | |
2232 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2233 | expires = rt->rt6i_expires - jiffies; | |
2234 | else | |
2235 | expires = INT_MAX; | |
69cdf8f9 | 2236 | |
e3703b3d TG |
2237 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, |
2238 | expires, rt->u.dst.error) < 0) | |
2239 | goto nla_put_failure; | |
2d7202bf TG |
2240 | |
2241 | return nlmsg_end(skb, nlh); | |
2242 | ||
2243 | nla_put_failure: | |
26932566 PM |
2244 | nlmsg_cancel(skb, nlh); |
2245 | return -EMSGSIZE; | |
1da177e4 LT |
2246 | } |
2247 | ||
1b43af54 | 2248 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2249 | { |
2250 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2251 | int prefix; | |
2252 | ||
2d7202bf TG |
2253 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2254 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2255 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2256 | } else | |
2257 | prefix = 0; | |
2258 | ||
191cd582 BH |
2259 | return rt6_fill_node(arg->net, |
2260 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2261 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2262 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2263 | } |
2264 | ||
c127ea2c | 2265 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2266 | { |
3b1e0a65 | 2267 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2268 | struct nlattr *tb[RTA_MAX+1]; |
2269 | struct rt6_info *rt; | |
1da177e4 | 2270 | struct sk_buff *skb; |
ab364a6f | 2271 | struct rtmsg *rtm; |
1da177e4 | 2272 | struct flowi fl; |
ab364a6f | 2273 | int err, iif = 0; |
1da177e4 | 2274 | |
ab364a6f TG |
2275 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2276 | if (err < 0) | |
2277 | goto errout; | |
1da177e4 | 2278 | |
ab364a6f | 2279 | err = -EINVAL; |
1da177e4 | 2280 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2281 | |
ab364a6f TG |
2282 | if (tb[RTA_SRC]) { |
2283 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2284 | goto errout; | |
2285 | ||
2286 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2287 | } | |
2288 | ||
2289 | if (tb[RTA_DST]) { | |
2290 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2291 | goto errout; | |
2292 | ||
2293 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2294 | } | |
2295 | ||
2296 | if (tb[RTA_IIF]) | |
2297 | iif = nla_get_u32(tb[RTA_IIF]); | |
2298 | ||
2299 | if (tb[RTA_OIF]) | |
2300 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2301 | |
2302 | if (iif) { | |
2303 | struct net_device *dev; | |
5578689a | 2304 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2305 | if (!dev) { |
2306 | err = -ENODEV; | |
ab364a6f | 2307 | goto errout; |
1da177e4 LT |
2308 | } |
2309 | } | |
2310 | ||
ab364a6f TG |
2311 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2312 | if (skb == NULL) { | |
2313 | err = -ENOBUFS; | |
2314 | goto errout; | |
2315 | } | |
1da177e4 | 2316 | |
ab364a6f TG |
2317 | /* Reserve room for dummy headers, this skb can pass |
2318 | through good chunk of routing engine. | |
2319 | */ | |
459a98ed | 2320 | skb_reset_mac_header(skb); |
ab364a6f | 2321 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2322 | |
8a3edd80 | 2323 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
2324 | skb->dst = &rt->u.dst; |
2325 | ||
191cd582 | 2326 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2327 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2328 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2329 | if (err < 0) { |
ab364a6f TG |
2330 | kfree_skb(skb); |
2331 | goto errout; | |
1da177e4 LT |
2332 | } |
2333 | ||
5578689a | 2334 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2335 | errout: |
1da177e4 | 2336 | return err; |
1da177e4 LT |
2337 | } |
2338 | ||
86872cb5 | 2339 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2340 | { |
2341 | struct sk_buff *skb; | |
5578689a | 2342 | struct net *net = info->nl_net; |
528c4ceb DL |
2343 | u32 seq; |
2344 | int err; | |
2345 | ||
2346 | err = -ENOBUFS; | |
2347 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2348 | |
339bf98f | 2349 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2350 | if (skb == NULL) |
2351 | goto errout; | |
2352 | ||
191cd582 | 2353 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2354 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2355 | if (err < 0) { |
2356 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2357 | WARN_ON(err == -EMSGSIZE); | |
2358 | kfree_skb(skb); | |
2359 | goto errout; | |
2360 | } | |
5578689a DL |
2361 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2362 | info->nlh, gfp_any()); | |
21713ebc TG |
2363 | errout: |
2364 | if (err < 0) | |
5578689a | 2365 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2366 | } |
2367 | ||
8ed67789 DL |
2368 | static int ip6_route_dev_notify(struct notifier_block *this, |
2369 | unsigned long event, void *data) | |
2370 | { | |
2371 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2372 | struct net *net = dev_net(dev); |
8ed67789 DL |
2373 | |
2374 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2375 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2376 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2377 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2378 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2379 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2380 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2381 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2382 | #endif | |
2383 | } | |
2384 | ||
2385 | return NOTIFY_OK; | |
2386 | } | |
2387 | ||
1da177e4 LT |
2388 | /* |
2389 | * /proc | |
2390 | */ | |
2391 | ||
2392 | #ifdef CONFIG_PROC_FS | |
2393 | ||
2394 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2395 | ||
2396 | struct rt6_proc_arg | |
2397 | { | |
2398 | char *buffer; | |
2399 | int offset; | |
2400 | int length; | |
2401 | int skip; | |
2402 | int len; | |
2403 | }; | |
2404 | ||
2405 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2406 | { | |
33120b30 | 2407 | struct seq_file *m = p_arg; |
1da177e4 | 2408 | |
4b7a4274 | 2409 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2410 | |
2411 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2412 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2413 | #else |
33120b30 | 2414 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2415 | #endif |
2416 | ||
2417 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2418 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2419 | } else { |
33120b30 | 2420 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2421 | } |
33120b30 AD |
2422 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2423 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2424 | rt->u.dst.__use, rt->rt6i_flags, | |
2425 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2426 | return 0; |
2427 | } | |
2428 | ||
33120b30 | 2429 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2430 | { |
f3db4851 DL |
2431 | struct net *net = (struct net *)m->private; |
2432 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2433 | return 0; |
2434 | } | |
1da177e4 | 2435 | |
33120b30 AD |
2436 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2437 | { | |
de05c557 | 2438 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2439 | } |
2440 | ||
33120b30 AD |
2441 | static const struct file_operations ipv6_route_proc_fops = { |
2442 | .owner = THIS_MODULE, | |
2443 | .open = ipv6_route_open, | |
2444 | .read = seq_read, | |
2445 | .llseek = seq_lseek, | |
b6fcbdb4 | 2446 | .release = single_release_net, |
33120b30 AD |
2447 | }; |
2448 | ||
1da177e4 LT |
2449 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2450 | { | |
69ddb805 | 2451 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2452 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2453 | net->ipv6.rt6_stats->fib_nodes, |
2454 | net->ipv6.rt6_stats->fib_route_nodes, | |
2455 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2456 | net->ipv6.rt6_stats->fib_rt_entries, | |
2457 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2458 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2459 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2460 | |
2461 | return 0; | |
2462 | } | |
2463 | ||
2464 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2465 | { | |
de05c557 | 2466 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2467 | } |
2468 | ||
9a32144e | 2469 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2470 | .owner = THIS_MODULE, |
2471 | .open = rt6_stats_seq_open, | |
2472 | .read = seq_read, | |
2473 | .llseek = seq_lseek, | |
b6fcbdb4 | 2474 | .release = single_release_net, |
1da177e4 LT |
2475 | }; |
2476 | #endif /* CONFIG_PROC_FS */ | |
2477 | ||
2478 | #ifdef CONFIG_SYSCTL | |
2479 | ||
1da177e4 LT |
2480 | static |
2481 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2482 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2483 | { | |
5b7c931d DL |
2484 | struct net *net = current->nsproxy->net_ns; |
2485 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2486 | if (write) { |
2487 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2488 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2489 | return 0; |
2490 | } else | |
2491 | return -EINVAL; | |
2492 | } | |
2493 | ||
760f2d01 | 2494 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2495 | { |
1da177e4 | 2496 | .procname = "flush", |
4990509f | 2497 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2498 | .maxlen = sizeof(int), |
89c8b3a1 | 2499 | .mode = 0200, |
6d9f239a | 2500 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2501 | }, |
2502 | { | |
2503 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2504 | .procname = "gc_thresh", | |
9a7ec3a9 | 2505 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2506 | .maxlen = sizeof(int), |
2507 | .mode = 0644, | |
6d9f239a | 2508 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2509 | }, |
2510 | { | |
2511 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2512 | .procname = "max_size", | |
4990509f | 2513 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2514 | .maxlen = sizeof(int), |
2515 | .mode = 0644, | |
6d9f239a | 2516 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2517 | }, |
2518 | { | |
2519 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2520 | .procname = "gc_min_interval", | |
4990509f | 2521 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2522 | .maxlen = sizeof(int), |
2523 | .mode = 0644, | |
6d9f239a AD |
2524 | .proc_handler = proc_dointvec_jiffies, |
2525 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2526 | }, |
2527 | { | |
2528 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2529 | .procname = "gc_timeout", | |
4990509f | 2530 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2531 | .maxlen = sizeof(int), |
2532 | .mode = 0644, | |
6d9f239a AD |
2533 | .proc_handler = proc_dointvec_jiffies, |
2534 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2535 | }, |
2536 | { | |
2537 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2538 | .procname = "gc_interval", | |
4990509f | 2539 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2540 | .maxlen = sizeof(int), |
2541 | .mode = 0644, | |
6d9f239a AD |
2542 | .proc_handler = proc_dointvec_jiffies, |
2543 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2544 | }, |
2545 | { | |
2546 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2547 | .procname = "gc_elasticity", | |
4990509f | 2548 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2549 | .maxlen = sizeof(int), |
2550 | .mode = 0644, | |
6d9f239a AD |
2551 | .proc_handler = proc_dointvec_jiffies, |
2552 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2553 | }, |
2554 | { | |
2555 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2556 | .procname = "mtu_expires", | |
4990509f | 2557 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2558 | .maxlen = sizeof(int), |
2559 | .mode = 0644, | |
6d9f239a AD |
2560 | .proc_handler = proc_dointvec_jiffies, |
2561 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2562 | }, |
2563 | { | |
2564 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2565 | .procname = "min_adv_mss", | |
4990509f | 2566 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2567 | .maxlen = sizeof(int), |
2568 | .mode = 0644, | |
6d9f239a AD |
2569 | .proc_handler = proc_dointvec_jiffies, |
2570 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2571 | }, |
2572 | { | |
2573 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2574 | .procname = "gc_min_interval_ms", | |
4990509f | 2575 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2576 | .maxlen = sizeof(int), |
2577 | .mode = 0644, | |
6d9f239a AD |
2578 | .proc_handler = proc_dointvec_ms_jiffies, |
2579 | .strategy = sysctl_ms_jiffies, | |
1da177e4 LT |
2580 | }, |
2581 | { .ctl_name = 0 } | |
2582 | }; | |
2583 | ||
760f2d01 DL |
2584 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2585 | { | |
2586 | struct ctl_table *table; | |
2587 | ||
2588 | table = kmemdup(ipv6_route_table_template, | |
2589 | sizeof(ipv6_route_table_template), | |
2590 | GFP_KERNEL); | |
5ee09105 YH |
2591 | |
2592 | if (table) { | |
2593 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2594 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2595 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2596 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2597 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2598 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2599 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2600 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2601 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2602 | } | |
2603 | ||
760f2d01 DL |
2604 | return table; |
2605 | } | |
1da177e4 LT |
2606 | #endif |
2607 | ||
cdb18761 DL |
2608 | static int ip6_route_net_init(struct net *net) |
2609 | { | |
633d424b | 2610 | int ret = -ENOMEM; |
8ed67789 | 2611 | |
f2fc6a54 BT |
2612 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2613 | sizeof(*net->ipv6.ip6_dst_ops), | |
2614 | GFP_KERNEL); | |
2615 | if (!net->ipv6.ip6_dst_ops) | |
2616 | goto out; | |
48115bec | 2617 | net->ipv6.ip6_dst_ops->dst_net = hold_net(net); |
f2fc6a54 | 2618 | |
8ed67789 DL |
2619 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2620 | sizeof(*net->ipv6.ip6_null_entry), | |
2621 | GFP_KERNEL); | |
2622 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2623 | goto out_ip6_dst_ops; |
8ed67789 DL |
2624 | net->ipv6.ip6_null_entry->u.dst.path = |
2625 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2626 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2627 | |
2628 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2629 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2630 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2631 | GFP_KERNEL); | |
68fffc67 PZ |
2632 | if (!net->ipv6.ip6_prohibit_entry) |
2633 | goto out_ip6_null_entry; | |
8ed67789 DL |
2634 | net->ipv6.ip6_prohibit_entry->u.dst.path = |
2635 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2636 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2637 | |
2638 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2639 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2640 | GFP_KERNEL); | |
68fffc67 PZ |
2641 | if (!net->ipv6.ip6_blk_hole_entry) |
2642 | goto out_ip6_prohibit_entry; | |
8ed67789 DL |
2643 | net->ipv6.ip6_blk_hole_entry->u.dst.path = |
2644 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2645 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2646 | #endif |
2647 | ||
b339a47c PZ |
2648 | net->ipv6.sysctl.flush_delay = 0; |
2649 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2650 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2651 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2652 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2653 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2654 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2655 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2656 | ||
cdb18761 DL |
2657 | #ifdef CONFIG_PROC_FS |
2658 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2659 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2660 | #endif | |
6891a346 BT |
2661 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2662 | ||
8ed67789 DL |
2663 | ret = 0; |
2664 | out: | |
2665 | return ret; | |
f2fc6a54 | 2666 | |
68fffc67 PZ |
2667 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2668 | out_ip6_prohibit_entry: | |
2669 | kfree(net->ipv6.ip6_prohibit_entry); | |
2670 | out_ip6_null_entry: | |
2671 | kfree(net->ipv6.ip6_null_entry); | |
2672 | #endif | |
f2fc6a54 | 2673 | out_ip6_dst_ops: |
48115bec | 2674 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 BT |
2675 | kfree(net->ipv6.ip6_dst_ops); |
2676 | goto out; | |
cdb18761 DL |
2677 | } |
2678 | ||
2679 | static void ip6_route_net_exit(struct net *net) | |
2680 | { | |
2681 | #ifdef CONFIG_PROC_FS | |
2682 | proc_net_remove(net, "ipv6_route"); | |
2683 | proc_net_remove(net, "rt6_stats"); | |
2684 | #endif | |
8ed67789 DL |
2685 | kfree(net->ipv6.ip6_null_entry); |
2686 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2687 | kfree(net->ipv6.ip6_prohibit_entry); | |
2688 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2689 | #endif | |
48115bec | 2690 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 | 2691 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2692 | } |
2693 | ||
2694 | static struct pernet_operations ip6_route_net_ops = { | |
2695 | .init = ip6_route_net_init, | |
2696 | .exit = ip6_route_net_exit, | |
2697 | }; | |
2698 | ||
8ed67789 DL |
2699 | static struct notifier_block ip6_route_dev_notifier = { |
2700 | .notifier_call = ip6_route_dev_notify, | |
2701 | .priority = 0, | |
2702 | }; | |
2703 | ||
433d49c3 | 2704 | int __init ip6_route_init(void) |
1da177e4 | 2705 | { |
433d49c3 DL |
2706 | int ret; |
2707 | ||
9a7ec3a9 DL |
2708 | ret = -ENOMEM; |
2709 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2710 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2711 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2712 | if (!ip6_dst_ops_template.kmem_cachep) |
f2fc6a54 | 2713 | goto out;; |
14e50e57 | 2714 | |
8ed67789 DL |
2715 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2716 | if (ret) | |
bdb3289f | 2717 | goto out_kmem_cache; |
bdb3289f | 2718 | |
5dc121e9 AE |
2719 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2720 | ||
8ed67789 DL |
2721 | /* Registering of the loopback is done before this portion of code, |
2722 | * the loopback reference in rt6_info will not be taken, do it | |
2723 | * manually for init_net */ | |
2724 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2725 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2726 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2727 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2728 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2729 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2730 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2731 | #endif | |
433d49c3 DL |
2732 | ret = fib6_init(); |
2733 | if (ret) | |
8ed67789 | 2734 | goto out_register_subsys; |
433d49c3 | 2735 | |
433d49c3 DL |
2736 | ret = xfrm6_init(); |
2737 | if (ret) | |
cdb18761 | 2738 | goto out_fib6_init; |
c35b7e72 | 2739 | |
433d49c3 DL |
2740 | ret = fib6_rules_init(); |
2741 | if (ret) | |
2742 | goto xfrm6_init; | |
7e5449c2 | 2743 | |
433d49c3 DL |
2744 | ret = -ENOBUFS; |
2745 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2746 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2747 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2748 | goto fib6_rules_init; | |
c127ea2c | 2749 | |
8ed67789 | 2750 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2751 | if (ret) |
2752 | goto fib6_rules_init; | |
8ed67789 | 2753 | |
433d49c3 DL |
2754 | out: |
2755 | return ret; | |
2756 | ||
2757 | fib6_rules_init: | |
433d49c3 DL |
2758 | fib6_rules_cleanup(); |
2759 | xfrm6_init: | |
433d49c3 | 2760 | xfrm6_fini(); |
433d49c3 | 2761 | out_fib6_init: |
433d49c3 | 2762 | fib6_gc_cleanup(); |
8ed67789 DL |
2763 | out_register_subsys: |
2764 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2765 | out_kmem_cache: |
f2fc6a54 | 2766 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2767 | goto out; |
1da177e4 LT |
2768 | } |
2769 | ||
2770 | void ip6_route_cleanup(void) | |
2771 | { | |
8ed67789 | 2772 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2773 | fib6_rules_cleanup(); |
1da177e4 | 2774 | xfrm6_fini(); |
1da177e4 | 2775 | fib6_gc_cleanup(); |
8ed67789 | 2776 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2777 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2778 | } |