Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 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> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
519fbd87 | 75 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 76 | |
1da177e4 LT |
77 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
78 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
89 | ||
70ceb4f5 | 90 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
91 | static struct rt6_info *rt6_add_route_info(struct net *net, |
92 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
93 | struct in6_addr *gwaddr, int ifindex, |
94 | unsigned pref); | |
efa2cea0 DL |
95 | static struct rt6_info *rt6_get_route_info(struct net *net, |
96 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
97 | struct in6_addr *gwaddr, int ifindex); |
98 | #endif | |
99 | ||
9a7ec3a9 | 100 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 101 | .family = AF_INET6, |
09640e63 | 102 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
103 | .gc = ip6_dst_gc, |
104 | .gc_thresh = 1024, | |
105 | .check = ip6_dst_check, | |
106 | .destroy = ip6_dst_destroy, | |
107 | .ifdown = ip6_dst_ifdown, | |
108 | .negative_advice = ip6_negative_advice, | |
109 | .link_failure = ip6_link_failure, | |
110 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 111 | .local_out = __ip6_local_out, |
e2422970 | 112 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
113 | }; |
114 | ||
14e50e57 DM |
115 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
116 | { | |
117 | } | |
118 | ||
119 | static struct dst_ops ip6_dst_blackhole_ops = { | |
120 | .family = AF_INET6, | |
09640e63 | 121 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
122 | .destroy = ip6_dst_destroy, |
123 | .check = ip6_dst_check, | |
124 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
e2422970 | 125 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
126 | }; |
127 | ||
bdb3289f | 128 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
129 | .dst = { |
130 | .__refcnt = ATOMIC_INIT(1), | |
131 | .__use = 1, | |
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 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 139 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
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 = { |
d8d1f30b CG |
150 | .dst = { |
151 | .__refcnt = ATOMIC_INIT(1), | |
152 | .__use = 1, | |
153 | .obsolete = -1, | |
154 | .error = -EACCES, | |
155 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
156 | .input = ip6_pkt_prohibit, | |
157 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
158 | }, |
159 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 160 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
161 | .rt6i_metric = ~(u32) 0, |
162 | .rt6i_ref = ATOMIC_INIT(1), | |
163 | }; | |
164 | ||
bdb3289f | 165 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
166 | .dst = { |
167 | .__refcnt = ATOMIC_INIT(1), | |
168 | .__use = 1, | |
169 | .obsolete = -1, | |
170 | .error = -EINVAL, | |
171 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
172 | .input = dst_discard, | |
173 | .output = dst_discard, | |
101367c2 TG |
174 | }, |
175 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 176 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
177 | .rt6i_metric = ~(u32) 0, |
178 | .rt6i_ref = ATOMIC_INIT(1), | |
179 | }; | |
180 | ||
181 | #endif | |
182 | ||
1da177e4 | 183 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 184 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 185 | { |
f2fc6a54 | 186 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
187 | } |
188 | ||
189 | static void ip6_dst_destroy(struct dst_entry *dst) | |
190 | { | |
191 | struct rt6_info *rt = (struct rt6_info *)dst; | |
192 | struct inet6_dev *idev = rt->rt6i_idev; | |
193 | ||
194 | if (idev != NULL) { | |
195 | rt->rt6i_idev = NULL; | |
196 | in6_dev_put(idev); | |
1ab1457c | 197 | } |
1da177e4 LT |
198 | } |
199 | ||
200 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
201 | int how) | |
202 | { | |
203 | struct rt6_info *rt = (struct rt6_info *)dst; | |
204 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 205 | struct net_device *loopback_dev = |
c346dca1 | 206 | dev_net(dev)->loopback_dev; |
1da177e4 | 207 | |
5a3e55d6 DL |
208 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
209 | struct inet6_dev *loopback_idev = | |
210 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
211 | if (loopback_idev != NULL) { |
212 | rt->rt6i_idev = loopback_idev; | |
213 | in6_dev_put(idev); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
218 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
219 | { | |
220 | return (rt->rt6i_flags & RTF_EXPIRES && | |
221 | time_after(jiffies, rt->rt6i_expires)); | |
222 | } | |
223 | ||
c71099ac TG |
224 | static inline int rt6_need_strict(struct in6_addr *daddr) |
225 | { | |
226 | return (ipv6_addr_type(daddr) & | |
5ce83afa | 227 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)); |
c71099ac TG |
228 | } |
229 | ||
1da177e4 | 230 | /* |
c71099ac | 231 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
232 | */ |
233 | ||
8ed67789 DL |
234 | static inline struct rt6_info *rt6_device_match(struct net *net, |
235 | struct rt6_info *rt, | |
dd3abc4e | 236 | struct in6_addr *saddr, |
1da177e4 | 237 | int oif, |
d420895e | 238 | int flags) |
1da177e4 LT |
239 | { |
240 | struct rt6_info *local = NULL; | |
241 | struct rt6_info *sprt; | |
242 | ||
dd3abc4e YH |
243 | if (!oif && ipv6_addr_any(saddr)) |
244 | goto out; | |
245 | ||
d8d1f30b | 246 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
dd3abc4e YH |
247 | struct net_device *dev = sprt->rt6i_dev; |
248 | ||
249 | if (oif) { | |
1da177e4 LT |
250 | if (dev->ifindex == oif) |
251 | return sprt; | |
252 | if (dev->flags & IFF_LOOPBACK) { | |
253 | if (sprt->rt6i_idev == NULL || | |
254 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 255 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 256 | continue; |
1ab1457c | 257 | if (local && (!oif || |
1da177e4 LT |
258 | local->rt6i_idev->dev->ifindex == oif)) |
259 | continue; | |
260 | } | |
261 | local = sprt; | |
262 | } | |
dd3abc4e YH |
263 | } else { |
264 | if (ipv6_chk_addr(net, saddr, dev, | |
265 | flags & RT6_LOOKUP_F_IFACE)) | |
266 | return sprt; | |
1da177e4 | 267 | } |
dd3abc4e | 268 | } |
1da177e4 | 269 | |
dd3abc4e | 270 | if (oif) { |
1da177e4 LT |
271 | if (local) |
272 | return local; | |
273 | ||
d420895e | 274 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 275 | return net->ipv6.ip6_null_entry; |
1da177e4 | 276 | } |
dd3abc4e | 277 | out: |
1da177e4 LT |
278 | return rt; |
279 | } | |
280 | ||
27097255 YH |
281 | #ifdef CONFIG_IPV6_ROUTER_PREF |
282 | static void rt6_probe(struct rt6_info *rt) | |
283 | { | |
284 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
285 | /* | |
286 | * Okay, this does not seem to be appropriate | |
287 | * for now, however, we need to check if it | |
288 | * is really so; aka Router Reachability Probing. | |
289 | * | |
290 | * Router Reachability Probe MUST be rate-limited | |
291 | * to no more than one per minute. | |
292 | */ | |
293 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
294 | return; | |
295 | read_lock_bh(&neigh->lock); | |
296 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 297 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
298 | struct in6_addr mcaddr; |
299 | struct in6_addr *target; | |
300 | ||
301 | neigh->updated = jiffies; | |
302 | read_unlock_bh(&neigh->lock); | |
303 | ||
304 | target = (struct in6_addr *)&neigh->primary_key; | |
305 | addrconf_addr_solict_mult(target, &mcaddr); | |
306 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
307 | } else | |
308 | read_unlock_bh(&neigh->lock); | |
309 | } | |
310 | #else | |
311 | static inline void rt6_probe(struct rt6_info *rt) | |
312 | { | |
27097255 YH |
313 | } |
314 | #endif | |
315 | ||
1da177e4 | 316 | /* |
554cfb7e | 317 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 318 | */ |
b6f99a21 | 319 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
320 | { |
321 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 322 | if (!oif || dev->ifindex == oif) |
554cfb7e | 323 | return 2; |
161980f4 DM |
324 | if ((dev->flags & IFF_LOOPBACK) && |
325 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
326 | return 1; | |
327 | return 0; | |
554cfb7e | 328 | } |
1da177e4 | 329 | |
b6f99a21 | 330 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 331 | { |
554cfb7e | 332 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 333 | int m; |
4d0c5911 YH |
334 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
335 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
336 | m = 1; | |
337 | else if (neigh) { | |
554cfb7e YH |
338 | read_lock_bh(&neigh->lock); |
339 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 340 | m = 2; |
398bcbeb YH |
341 | #ifdef CONFIG_IPV6_ROUTER_PREF |
342 | else if (neigh->nud_state & NUD_FAILED) | |
343 | m = 0; | |
344 | #endif | |
345 | else | |
ea73ee23 | 346 | m = 1; |
554cfb7e | 347 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
348 | } else |
349 | m = 0; | |
554cfb7e | 350 | return m; |
1da177e4 LT |
351 | } |
352 | ||
554cfb7e YH |
353 | static int rt6_score_route(struct rt6_info *rt, int oif, |
354 | int strict) | |
1da177e4 | 355 | { |
4d0c5911 | 356 | int m, n; |
1ab1457c | 357 | |
4d0c5911 | 358 | m = rt6_check_dev(rt, oif); |
77d16f45 | 359 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 360 | return -1; |
ebacaaa0 YH |
361 | #ifdef CONFIG_IPV6_ROUTER_PREF |
362 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
363 | #endif | |
4d0c5911 | 364 | n = rt6_check_neigh(rt); |
557e92ef | 365 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
366 | return -1; |
367 | return m; | |
368 | } | |
369 | ||
f11e6659 DM |
370 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
371 | int *mpri, struct rt6_info *match) | |
554cfb7e | 372 | { |
f11e6659 DM |
373 | int m; |
374 | ||
375 | if (rt6_check_expired(rt)) | |
376 | goto out; | |
377 | ||
378 | m = rt6_score_route(rt, oif, strict); | |
379 | if (m < 0) | |
380 | goto out; | |
381 | ||
382 | if (m > *mpri) { | |
383 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
384 | rt6_probe(match); | |
385 | *mpri = m; | |
386 | match = rt; | |
387 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
388 | rt6_probe(rt); | |
389 | } | |
390 | ||
391 | out: | |
392 | return match; | |
393 | } | |
394 | ||
395 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
396 | struct rt6_info *rr_head, | |
397 | u32 metric, int oif, int strict) | |
398 | { | |
399 | struct rt6_info *rt, *match; | |
554cfb7e | 400 | int mpri = -1; |
1da177e4 | 401 | |
f11e6659 DM |
402 | match = NULL; |
403 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 404 | rt = rt->dst.rt6_next) |
f11e6659 DM |
405 | match = find_match(rt, oif, strict, &mpri, match); |
406 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 407 | rt = rt->dst.rt6_next) |
f11e6659 | 408 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 409 | |
f11e6659 DM |
410 | return match; |
411 | } | |
1da177e4 | 412 | |
f11e6659 DM |
413 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
414 | { | |
415 | struct rt6_info *match, *rt0; | |
8ed67789 | 416 | struct net *net; |
1da177e4 | 417 | |
f11e6659 | 418 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 419 | __func__, fn->leaf, oif); |
554cfb7e | 420 | |
f11e6659 DM |
421 | rt0 = fn->rr_ptr; |
422 | if (!rt0) | |
423 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 424 | |
f11e6659 | 425 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 426 | |
554cfb7e | 427 | if (!match && |
f11e6659 | 428 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 429 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 430 | |
554cfb7e | 431 | /* no entries matched; do round-robin */ |
f11e6659 DM |
432 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
433 | next = fn->leaf; | |
434 | ||
435 | if (next != rt0) | |
436 | fn->rr_ptr = next; | |
1da177e4 | 437 | } |
1da177e4 | 438 | |
f11e6659 | 439 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 440 | __func__, match); |
1da177e4 | 441 | |
c346dca1 | 442 | net = dev_net(rt0->rt6i_dev); |
8ed67789 | 443 | return (match ? match : net->ipv6.ip6_null_entry); |
1da177e4 LT |
444 | } |
445 | ||
70ceb4f5 YH |
446 | #ifdef CONFIG_IPV6_ROUTE_INFO |
447 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
448 | struct in6_addr *gwaddr) | |
449 | { | |
c346dca1 | 450 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
451 | struct route_info *rinfo = (struct route_info *) opt; |
452 | struct in6_addr prefix_buf, *prefix; | |
453 | unsigned int pref; | |
4bed72e4 | 454 | unsigned long lifetime; |
70ceb4f5 YH |
455 | struct rt6_info *rt; |
456 | ||
457 | if (len < sizeof(struct route_info)) { | |
458 | return -EINVAL; | |
459 | } | |
460 | ||
461 | /* Sanity check for prefix_len and length */ | |
462 | if (rinfo->length > 3) { | |
463 | return -EINVAL; | |
464 | } else if (rinfo->prefix_len > 128) { | |
465 | return -EINVAL; | |
466 | } else if (rinfo->prefix_len > 64) { | |
467 | if (rinfo->length < 2) { | |
468 | return -EINVAL; | |
469 | } | |
470 | } else if (rinfo->prefix_len > 0) { | |
471 | if (rinfo->length < 1) { | |
472 | return -EINVAL; | |
473 | } | |
474 | } | |
475 | ||
476 | pref = rinfo->route_pref; | |
477 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 478 | return -EINVAL; |
70ceb4f5 | 479 | |
4bed72e4 | 480 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
481 | |
482 | if (rinfo->length == 3) | |
483 | prefix = (struct in6_addr *)rinfo->prefix; | |
484 | else { | |
485 | /* this function is safe */ | |
486 | ipv6_addr_prefix(&prefix_buf, | |
487 | (struct in6_addr *)rinfo->prefix, | |
488 | rinfo->prefix_len); | |
489 | prefix = &prefix_buf; | |
490 | } | |
491 | ||
efa2cea0 DL |
492 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
493 | dev->ifindex); | |
70ceb4f5 YH |
494 | |
495 | if (rt && !lifetime) { | |
e0a1ad73 | 496 | ip6_del_rt(rt); |
70ceb4f5 YH |
497 | rt = NULL; |
498 | } | |
499 | ||
500 | if (!rt && lifetime) | |
efa2cea0 | 501 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
502 | pref); |
503 | else if (rt) | |
504 | rt->rt6i_flags = RTF_ROUTEINFO | | |
505 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
506 | ||
507 | if (rt) { | |
4bed72e4 | 508 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
509 | rt->rt6i_flags &= ~RTF_EXPIRES; |
510 | } else { | |
511 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
512 | rt->rt6i_flags |= RTF_EXPIRES; | |
513 | } | |
d8d1f30b | 514 | dst_release(&rt->dst); |
70ceb4f5 YH |
515 | } |
516 | return 0; | |
517 | } | |
518 | #endif | |
519 | ||
8ed67789 | 520 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 521 | do { \ |
8ed67789 | 522 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 523 | struct fib6_node *pn; \ |
e0eda7bb | 524 | while (1) { \ |
982f56f3 YH |
525 | if (fn->fn_flags & RTN_TL_ROOT) \ |
526 | goto out; \ | |
527 | pn = fn->parent; \ | |
528 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 529 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
530 | else \ |
531 | fn = pn; \ | |
532 | if (fn->fn_flags & RTN_RTINFO) \ | |
533 | goto restart; \ | |
c71099ac | 534 | } \ |
c71099ac | 535 | } \ |
982f56f3 | 536 | } while(0) |
c71099ac | 537 | |
8ed67789 DL |
538 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
539 | struct fib6_table *table, | |
c71099ac | 540 | struct flowi *fl, int flags) |
1da177e4 LT |
541 | { |
542 | struct fib6_node *fn; | |
543 | struct rt6_info *rt; | |
544 | ||
c71099ac TG |
545 | read_lock_bh(&table->tb6_lock); |
546 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
547 | restart: | |
548 | rt = fn->leaf; | |
dd3abc4e | 549 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 550 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 551 | out: |
d8d1f30b | 552 | dst_use(&rt->dst, jiffies); |
c71099ac | 553 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
554 | return rt; |
555 | ||
556 | } | |
557 | ||
9acd9f3a YH |
558 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
559 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
560 | { |
561 | struct flowi fl = { | |
562 | .oif = oif, | |
563 | .nl_u = { | |
564 | .ip6_u = { | |
565 | .daddr = *daddr, | |
c71099ac TG |
566 | }, |
567 | }, | |
568 | }; | |
569 | struct dst_entry *dst; | |
77d16f45 | 570 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 571 | |
adaa70bb TG |
572 | if (saddr) { |
573 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
574 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
575 | } | |
576 | ||
606a2b48 | 577 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
578 | if (dst->error == 0) |
579 | return (struct rt6_info *) dst; | |
580 | ||
581 | dst_release(dst); | |
582 | ||
1da177e4 LT |
583 | return NULL; |
584 | } | |
585 | ||
7159039a YH |
586 | EXPORT_SYMBOL(rt6_lookup); |
587 | ||
c71099ac | 588 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
589 | It takes new route entry, the addition fails by any reason the |
590 | route is freed. In any case, if caller does not hold it, it may | |
591 | be destroyed. | |
592 | */ | |
593 | ||
86872cb5 | 594 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
595 | { |
596 | int err; | |
c71099ac | 597 | struct fib6_table *table; |
1da177e4 | 598 | |
c71099ac TG |
599 | table = rt->rt6i_table; |
600 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 601 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 602 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
603 | |
604 | return err; | |
605 | } | |
606 | ||
40e22e8f TG |
607 | int ip6_ins_rt(struct rt6_info *rt) |
608 | { | |
4d1169c1 | 609 | struct nl_info info = { |
c346dca1 | 610 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 611 | }; |
528c4ceb | 612 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
613 | } |
614 | ||
95a9a5ba YH |
615 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
616 | struct in6_addr *saddr) | |
1da177e4 | 617 | { |
1da177e4 LT |
618 | struct rt6_info *rt; |
619 | ||
620 | /* | |
621 | * Clone the route. | |
622 | */ | |
623 | ||
624 | rt = ip6_rt_copy(ort); | |
625 | ||
626 | if (rt) { | |
14deae41 DM |
627 | struct neighbour *neigh; |
628 | int attempts = !in_softirq(); | |
629 | ||
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; | |
d8d1f30b | 640 | rt->dst.flags |= DST_HOST; |
1da177e4 LT |
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 | ||
14deae41 DM |
649 | retry: |
650 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
651 | if (IS_ERR(neigh)) { | |
652 | struct net *net = dev_net(rt->rt6i_dev); | |
653 | int saved_rt_min_interval = | |
654 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
655 | int saved_rt_elasticity = | |
656 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
657 | ||
658 | if (attempts-- > 0) { | |
659 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
660 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
661 | ||
86393e52 | 662 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
663 | |
664 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
665 | saved_rt_elasticity; | |
666 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
667 | saved_rt_min_interval; | |
668 | goto retry; | |
669 | } | |
670 | ||
671 | if (net_ratelimit()) | |
672 | printk(KERN_WARNING | |
673 | "Neighbour table overflow.\n"); | |
d8d1f30b | 674 | dst_free(&rt->dst); |
14deae41 DM |
675 | return NULL; |
676 | } | |
677 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 678 | |
95a9a5ba | 679 | } |
1da177e4 | 680 | |
95a9a5ba YH |
681 | return rt; |
682 | } | |
1da177e4 | 683 | |
299d9939 YH |
684 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
685 | { | |
686 | struct rt6_info *rt = ip6_rt_copy(ort); | |
687 | if (rt) { | |
688 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
689 | rt->rt6i_dst.plen = 128; | |
690 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 691 | rt->dst.flags |= DST_HOST; |
299d9939 YH |
692 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
693 | } | |
694 | return rt; | |
695 | } | |
696 | ||
8ed67789 DL |
697 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
698 | struct flowi *fl, int flags) | |
1da177e4 LT |
699 | { |
700 | struct fib6_node *fn; | |
519fbd87 | 701 | struct rt6_info *rt, *nrt; |
c71099ac | 702 | int strict = 0; |
1da177e4 | 703 | int attempts = 3; |
519fbd87 | 704 | int err; |
53b7997f | 705 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 706 | |
77d16f45 | 707 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
708 | |
709 | relookup: | |
c71099ac | 710 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 711 | |
8238dd06 | 712 | restart_2: |
c71099ac | 713 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
714 | |
715 | restart: | |
4acad72d | 716 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
717 | |
718 | BACKTRACK(net, &fl->fl6_src); | |
719 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 720 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 721 | goto out; |
1da177e4 | 722 | |
d8d1f30b | 723 | dst_hold(&rt->dst); |
c71099ac | 724 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 725 | |
519fbd87 | 726 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 727 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
728 | else { |
729 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 730 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
731 | #else |
732 | goto out2; | |
733 | #endif | |
734 | } | |
e40cf353 | 735 | |
d8d1f30b | 736 | dst_release(&rt->dst); |
8ed67789 | 737 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 738 | |
d8d1f30b | 739 | dst_hold(&rt->dst); |
519fbd87 | 740 | if (nrt) { |
40e22e8f | 741 | err = ip6_ins_rt(nrt); |
519fbd87 | 742 | if (!err) |
1da177e4 | 743 | goto out2; |
1da177e4 | 744 | } |
1da177e4 | 745 | |
519fbd87 YH |
746 | if (--attempts <= 0) |
747 | goto out2; | |
748 | ||
749 | /* | |
c71099ac | 750 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
751 | * released someone could insert this route. Relookup. |
752 | */ | |
d8d1f30b | 753 | dst_release(&rt->dst); |
519fbd87 YH |
754 | goto relookup; |
755 | ||
756 | out: | |
8238dd06 YH |
757 | if (reachable) { |
758 | reachable = 0; | |
759 | goto restart_2; | |
760 | } | |
d8d1f30b | 761 | dst_hold(&rt->dst); |
c71099ac | 762 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 763 | out2: |
d8d1f30b CG |
764 | rt->dst.lastuse = jiffies; |
765 | rt->dst.__use++; | |
c71099ac TG |
766 | |
767 | return rt; | |
1da177e4 LT |
768 | } |
769 | ||
8ed67789 | 770 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
771 | struct flowi *fl, int flags) |
772 | { | |
8ed67789 | 773 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
774 | } |
775 | ||
c71099ac TG |
776 | void ip6_route_input(struct sk_buff *skb) |
777 | { | |
0660e03f | 778 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 779 | struct net *net = dev_net(skb->dev); |
adaa70bb | 780 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
781 | struct flowi fl = { |
782 | .iif = skb->dev->ifindex, | |
783 | .nl_u = { | |
784 | .ip6_u = { | |
785 | .daddr = iph->daddr, | |
786 | .saddr = iph->saddr, | |
90bcaf7b | 787 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
788 | }, |
789 | }, | |
1ab1457c | 790 | .mark = skb->mark, |
c71099ac TG |
791 | .proto = iph->nexthdr, |
792 | }; | |
adaa70bb | 793 | |
1d6e55f1 | 794 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 795 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 796 | |
adf30907 | 797 | skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input)); |
c71099ac TG |
798 | } |
799 | ||
8ed67789 | 800 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 801 | struct flowi *fl, int flags) |
1da177e4 | 802 | { |
8ed67789 | 803 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
804 | } |
805 | ||
4591db4f DL |
806 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
807 | struct flowi *fl) | |
c71099ac TG |
808 | { |
809 | int flags = 0; | |
810 | ||
6057fd78 | 811 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl->fl6_dst)) |
77d16f45 | 812 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 813 | |
adaa70bb TG |
814 | if (!ipv6_addr_any(&fl->fl6_src)) |
815 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
0c9a2ac1 YH |
816 | else if (sk) |
817 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 818 | |
4591db4f | 819 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
820 | } |
821 | ||
7159039a | 822 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 823 | |
14e50e57 DM |
824 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
825 | { | |
826 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
827 | struct rt6_info *rt = (struct rt6_info *) | |
828 | dst_alloc(&ip6_dst_blackhole_ops); | |
829 | struct dst_entry *new = NULL; | |
830 | ||
831 | if (rt) { | |
d8d1f30b | 832 | new = &rt->dst; |
14e50e57 DM |
833 | |
834 | atomic_set(&new->__refcnt, 1); | |
835 | new->__use = 1; | |
352e512c HX |
836 | new->input = dst_discard; |
837 | new->output = dst_discard; | |
14e50e57 | 838 | |
d8d1f30b CG |
839 | memcpy(new->metrics, ort->dst.metrics, RTAX_MAX*sizeof(u32)); |
840 | new->dev = ort->dst.dev; | |
14e50e57 DM |
841 | if (new->dev) |
842 | dev_hold(new->dev); | |
843 | rt->rt6i_idev = ort->rt6i_idev; | |
844 | if (rt->rt6i_idev) | |
845 | in6_dev_hold(rt->rt6i_idev); | |
846 | rt->rt6i_expires = 0; | |
847 | ||
848 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
849 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
850 | rt->rt6i_metric = 0; | |
851 | ||
852 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
853 | #ifdef CONFIG_IPV6_SUBTREES | |
854 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
855 | #endif | |
856 | ||
857 | dst_free(new); | |
858 | } | |
859 | ||
860 | dst_release(*dstp); | |
861 | *dstp = new; | |
862 | return (new ? 0 : -ENOMEM); | |
863 | } | |
864 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
865 | ||
1da177e4 LT |
866 | /* |
867 | * Destination cache support functions | |
868 | */ | |
869 | ||
870 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
871 | { | |
872 | struct rt6_info *rt; | |
873 | ||
874 | rt = (struct rt6_info *) dst; | |
875 | ||
10414444 | 876 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
1da177e4 LT |
877 | return dst; |
878 | ||
879 | return NULL; | |
880 | } | |
881 | ||
882 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
883 | { | |
884 | struct rt6_info *rt = (struct rt6_info *) dst; | |
885 | ||
886 | if (rt) { | |
54c1a859 YH |
887 | if (rt->rt6i_flags & RTF_CACHE) { |
888 | if (rt6_check_expired(rt)) { | |
889 | ip6_del_rt(rt); | |
890 | dst = NULL; | |
891 | } | |
892 | } else { | |
1da177e4 | 893 | dst_release(dst); |
54c1a859 YH |
894 | dst = NULL; |
895 | } | |
1da177e4 | 896 | } |
54c1a859 | 897 | return dst; |
1da177e4 LT |
898 | } |
899 | ||
900 | static void ip6_link_failure(struct sk_buff *skb) | |
901 | { | |
902 | struct rt6_info *rt; | |
903 | ||
3ffe533c | 904 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 905 | |
adf30907 | 906 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
907 | if (rt) { |
908 | if (rt->rt6i_flags&RTF_CACHE) { | |
d8d1f30b | 909 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
910 | rt->rt6i_flags |= RTF_EXPIRES; |
911 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
912 | rt->rt6i_node->fn_sernum = -1; | |
913 | } | |
914 | } | |
915 | ||
916 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
917 | { | |
918 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
919 | ||
920 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
921 | rt6->rt6i_flags |= RTF_MODIFIED; | |
922 | if (mtu < IPV6_MIN_MTU) { | |
923 | mtu = IPV6_MIN_MTU; | |
924 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
925 | } | |
926 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 927 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
928 | } |
929 | } | |
930 | ||
1da177e4 LT |
931 | static int ipv6_get_mtu(struct net_device *dev); |
932 | ||
5578689a | 933 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
934 | { |
935 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
936 | ||
5578689a DL |
937 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
938 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
939 | |
940 | /* | |
1ab1457c YH |
941 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
942 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
943 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
944 | * rely only on pmtu discovery" |
945 | */ | |
946 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
947 | mtu = IPV6_MAXPLEN; | |
948 | return mtu; | |
949 | } | |
950 | ||
3b00944c YH |
951 | static struct dst_entry *icmp6_dst_gc_list; |
952 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 953 | |
3b00944c | 954 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 955 | struct neighbour *neigh, |
9acd9f3a | 956 | const struct in6_addr *addr) |
1da177e4 LT |
957 | { |
958 | struct rt6_info *rt; | |
959 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 960 | struct net *net = dev_net(dev); |
1da177e4 LT |
961 | |
962 | if (unlikely(idev == NULL)) | |
963 | return NULL; | |
964 | ||
86393e52 | 965 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
966 | if (unlikely(rt == NULL)) { |
967 | in6_dev_put(idev); | |
968 | goto out; | |
969 | } | |
970 | ||
971 | dev_hold(dev); | |
972 | if (neigh) | |
973 | neigh_hold(neigh); | |
14deae41 | 974 | else { |
1da177e4 | 975 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
976 | if (IS_ERR(neigh)) |
977 | neigh = NULL; | |
978 | } | |
1da177e4 LT |
979 | |
980 | rt->rt6i_dev = dev; | |
981 | rt->rt6i_idev = idev; | |
982 | rt->rt6i_nexthop = neigh; | |
d8d1f30b CG |
983 | atomic_set(&rt->dst.__refcnt, 1); |
984 | rt->dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
985 | rt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
986 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->dst)); | |
987 | rt->dst.output = ip6_output; | |
1da177e4 LT |
988 | |
989 | #if 0 /* there's no chance to use these for ndisc */ | |
d8d1f30b | 990 | rt->dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1ab1457c | 991 | ? DST_HOST |
1da177e4 LT |
992 | : 0; |
993 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
994 | rt->rt6i_dst.plen = 128; | |
995 | #endif | |
996 | ||
3b00944c | 997 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
998 | rt->dst.next = icmp6_dst_gc_list; |
999 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1000 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1001 | |
5578689a | 1002 | fib6_force_start_gc(net); |
1da177e4 LT |
1003 | |
1004 | out: | |
d8d1f30b | 1005 | return &rt->dst; |
1da177e4 LT |
1006 | } |
1007 | ||
3d0f24a7 | 1008 | int icmp6_dst_gc(void) |
1da177e4 LT |
1009 | { |
1010 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 1011 | int more = 0; |
1da177e4 LT |
1012 | |
1013 | next = NULL; | |
5d0bbeeb | 1014 | |
3b00944c YH |
1015 | spin_lock_bh(&icmp6_dst_lock); |
1016 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1017 | |
1da177e4 LT |
1018 | while ((dst = *pprev) != NULL) { |
1019 | if (!atomic_read(&dst->__refcnt)) { | |
1020 | *pprev = dst->next; | |
1021 | dst_free(dst); | |
1da177e4 LT |
1022 | } else { |
1023 | pprev = &dst->next; | |
3d0f24a7 | 1024 | ++more; |
1da177e4 LT |
1025 | } |
1026 | } | |
1027 | ||
3b00944c | 1028 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1029 | |
3d0f24a7 | 1030 | return more; |
1da177e4 LT |
1031 | } |
1032 | ||
1e493d19 DM |
1033 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1034 | void *arg) | |
1035 | { | |
1036 | struct dst_entry *dst, **pprev; | |
1037 | ||
1038 | spin_lock_bh(&icmp6_dst_lock); | |
1039 | pprev = &icmp6_dst_gc_list; | |
1040 | while ((dst = *pprev) != NULL) { | |
1041 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1042 | if (func(rt, arg)) { | |
1043 | *pprev = dst->next; | |
1044 | dst_free(dst); | |
1045 | } else { | |
1046 | pprev = &dst->next; | |
1047 | } | |
1048 | } | |
1049 | spin_unlock_bh(&icmp6_dst_lock); | |
1050 | } | |
1051 | ||
569d3645 | 1052 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1053 | { |
1da177e4 | 1054 | unsigned long now = jiffies; |
86393e52 | 1055 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1056 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1057 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1058 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1059 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1060 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1061 | ||
1062 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1063 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1064 | goto out; |
1065 | ||
6891a346 BT |
1066 | net->ipv6.ip6_rt_gc_expire++; |
1067 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1068 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1069 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1070 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1071 | out: |
7019b78e DL |
1072 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1073 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1077 | but results in cleaner routing tables. | |
1078 | ||
1079 | Remove it only when all the things will work! | |
1080 | */ | |
1081 | ||
1082 | static int ipv6_get_mtu(struct net_device *dev) | |
1083 | { | |
1084 | int mtu = IPV6_MIN_MTU; | |
1085 | struct inet6_dev *idev; | |
1086 | ||
1087 | idev = in6_dev_get(dev); | |
1088 | if (idev) { | |
1089 | mtu = idev->cnf.mtu6; | |
1090 | in6_dev_put(idev); | |
1091 | } | |
1092 | return mtu; | |
1093 | } | |
1094 | ||
6b75d090 | 1095 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1096 | { |
6b75d090 YH |
1097 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1098 | if (hoplimit < 0) { | |
1099 | struct net_device *dev = dst->dev; | |
1100 | struct inet6_dev *idev = in6_dev_get(dev); | |
1101 | if (idev) { | |
1102 | hoplimit = idev->cnf.hop_limit; | |
1103 | in6_dev_put(idev); | |
1104 | } else | |
53b7997f | 1105 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
1da177e4 LT |
1106 | } |
1107 | return hoplimit; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * | |
1112 | */ | |
1113 | ||
86872cb5 | 1114 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1115 | { |
1116 | int err; | |
5578689a | 1117 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1118 | struct rt6_info *rt = NULL; |
1119 | struct net_device *dev = NULL; | |
1120 | struct inet6_dev *idev = NULL; | |
c71099ac | 1121 | struct fib6_table *table; |
1da177e4 LT |
1122 | int addr_type; |
1123 | ||
86872cb5 | 1124 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1125 | return -EINVAL; |
1126 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1127 | if (cfg->fc_src_len) |
1da177e4 LT |
1128 | return -EINVAL; |
1129 | #endif | |
86872cb5 | 1130 | if (cfg->fc_ifindex) { |
1da177e4 | 1131 | err = -ENODEV; |
5578689a | 1132 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1133 | if (!dev) |
1134 | goto out; | |
1135 | idev = in6_dev_get(dev); | |
1136 | if (!idev) | |
1137 | goto out; | |
1138 | } | |
1139 | ||
86872cb5 TG |
1140 | if (cfg->fc_metric == 0) |
1141 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1142 | |
5578689a | 1143 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1144 | if (table == NULL) { |
1145 | err = -ENOBUFS; | |
1146 | goto out; | |
1147 | } | |
1148 | ||
86393e52 | 1149 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1150 | |
1151 | if (rt == NULL) { | |
1152 | err = -ENOMEM; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
d8d1f30b | 1156 | rt->dst.obsolete = -1; |
6f704992 YH |
1157 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1158 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1159 | 0; | |
1da177e4 | 1160 | |
86872cb5 TG |
1161 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1162 | cfg->fc_protocol = RTPROT_BOOT; | |
1163 | rt->rt6i_protocol = cfg->fc_protocol; | |
1164 | ||
1165 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1166 | |
1167 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1168 | rt->dst.input = ip6_mc_input; |
1da177e4 | 1169 | else |
d8d1f30b | 1170 | rt->dst.input = ip6_forward; |
1da177e4 | 1171 | |
d8d1f30b | 1172 | rt->dst.output = ip6_output; |
1da177e4 | 1173 | |
86872cb5 TG |
1174 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1175 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1176 | if (rt->rt6i_dst.plen == 128) |
d8d1f30b | 1177 | rt->dst.flags = DST_HOST; |
1da177e4 LT |
1178 | |
1179 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1180 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1181 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1182 | #endif |
1183 | ||
86872cb5 | 1184 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1185 | |
1186 | /* We cannot add true routes via loopback here, | |
1187 | they would result in kernel looping; promote them to reject routes | |
1188 | */ | |
86872cb5 | 1189 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1190 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1191 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1192 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1193 | if (dev) { |
1194 | dev_put(dev); | |
1195 | in6_dev_put(idev); | |
1196 | } | |
5578689a | 1197 | dev = net->loopback_dev; |
1da177e4 LT |
1198 | dev_hold(dev); |
1199 | idev = in6_dev_get(dev); | |
1200 | if (!idev) { | |
1201 | err = -ENODEV; | |
1202 | goto out; | |
1203 | } | |
1204 | } | |
d8d1f30b CG |
1205 | rt->dst.output = ip6_pkt_discard_out; |
1206 | rt->dst.input = ip6_pkt_discard; | |
1207 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1208 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1209 | goto install_route; | |
1210 | } | |
1211 | ||
86872cb5 | 1212 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1213 | struct in6_addr *gw_addr; |
1214 | int gwa_type; | |
1215 | ||
86872cb5 TG |
1216 | gw_addr = &cfg->fc_gateway; |
1217 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1218 | gwa_type = ipv6_addr_type(gw_addr); |
1219 | ||
1220 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1221 | struct rt6_info *grt; | |
1222 | ||
1223 | /* IPv6 strictly inhibits using not link-local | |
1224 | addresses as nexthop address. | |
1225 | Otherwise, router will not able to send redirects. | |
1226 | It is very good, but in some (rare!) circumstances | |
1227 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1228 | some exceptions. --ANK | |
1229 | */ | |
1230 | err = -EINVAL; | |
1231 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1232 | goto out; | |
1233 | ||
5578689a | 1234 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1235 | |
1236 | err = -EHOSTUNREACH; | |
1237 | if (grt == NULL) | |
1238 | goto out; | |
1239 | if (dev) { | |
1240 | if (dev != grt->rt6i_dev) { | |
d8d1f30b | 1241 | dst_release(&grt->dst); |
1da177e4 LT |
1242 | goto out; |
1243 | } | |
1244 | } else { | |
1245 | dev = grt->rt6i_dev; | |
1246 | idev = grt->rt6i_idev; | |
1247 | dev_hold(dev); | |
1248 | in6_dev_hold(grt->rt6i_idev); | |
1249 | } | |
1250 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1251 | err = 0; | |
d8d1f30b | 1252 | dst_release(&grt->dst); |
1da177e4 LT |
1253 | |
1254 | if (err) | |
1255 | goto out; | |
1256 | } | |
1257 | err = -EINVAL; | |
1258 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1259 | goto out; | |
1260 | } | |
1261 | ||
1262 | err = -ENODEV; | |
1263 | if (dev == NULL) | |
1264 | goto out; | |
1265 | ||
86872cb5 | 1266 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1267 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1268 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1269 | err = PTR_ERR(rt->rt6i_nexthop); | |
1270 | rt->rt6i_nexthop = NULL; | |
1271 | goto out; | |
1272 | } | |
1273 | } | |
1274 | ||
86872cb5 | 1275 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1276 | |
1277 | install_route: | |
86872cb5 TG |
1278 | if (cfg->fc_mx) { |
1279 | struct nlattr *nla; | |
1280 | int remaining; | |
1281 | ||
1282 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1283 | int type = nla_type(nla); |
86872cb5 TG |
1284 | |
1285 | if (type) { | |
1286 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1287 | err = -EINVAL; |
1288 | goto out; | |
1289 | } | |
86872cb5 | 1290 | |
d8d1f30b | 1291 | rt->dst.metrics[type - 1] = nla_get_u32(nla); |
1da177e4 | 1292 | } |
1da177e4 LT |
1293 | } |
1294 | } | |
1295 | ||
d8d1f30b CG |
1296 | if (dst_metric(&rt->dst, RTAX_HOPLIMIT) == 0) |
1297 | rt->dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1298 | if (!dst_mtu(&rt->dst)) | |
1299 | rt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1300 | if (!dst_metric(&rt->dst, RTAX_ADVMSS)) | |
1301 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->dst)); | |
1302 | rt->dst.dev = dev; | |
1da177e4 | 1303 | rt->rt6i_idev = idev; |
c71099ac | 1304 | rt->rt6i_table = table; |
63152fc0 | 1305 | |
c346dca1 | 1306 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1307 | |
86872cb5 | 1308 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1309 | |
1310 | out: | |
1311 | if (dev) | |
1312 | dev_put(dev); | |
1313 | if (idev) | |
1314 | in6_dev_put(idev); | |
1315 | if (rt) | |
d8d1f30b | 1316 | dst_free(&rt->dst); |
1da177e4 LT |
1317 | return err; |
1318 | } | |
1319 | ||
86872cb5 | 1320 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1321 | { |
1322 | int err; | |
c71099ac | 1323 | struct fib6_table *table; |
c346dca1 | 1324 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1325 | |
8ed67789 | 1326 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1327 | return -ENOENT; |
1328 | ||
c71099ac TG |
1329 | table = rt->rt6i_table; |
1330 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1331 | |
86872cb5 | 1332 | err = fib6_del(rt, info); |
d8d1f30b | 1333 | dst_release(&rt->dst); |
1da177e4 | 1334 | |
c71099ac | 1335 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1336 | |
1337 | return err; | |
1338 | } | |
1339 | ||
e0a1ad73 TG |
1340 | int ip6_del_rt(struct rt6_info *rt) |
1341 | { | |
4d1169c1 | 1342 | struct nl_info info = { |
c346dca1 | 1343 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1344 | }; |
528c4ceb | 1345 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1346 | } |
1347 | ||
86872cb5 | 1348 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1349 | { |
c71099ac | 1350 | struct fib6_table *table; |
1da177e4 LT |
1351 | struct fib6_node *fn; |
1352 | struct rt6_info *rt; | |
1353 | int err = -ESRCH; | |
1354 | ||
5578689a | 1355 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1356 | if (table == NULL) |
1357 | return err; | |
1358 | ||
1359 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1360 | |
c71099ac | 1361 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1362 | &cfg->fc_dst, cfg->fc_dst_len, |
1363 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1364 | |
1da177e4 | 1365 | if (fn) { |
d8d1f30b | 1366 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1367 | if (cfg->fc_ifindex && |
1da177e4 | 1368 | (rt->rt6i_dev == NULL || |
86872cb5 | 1369 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1370 | continue; |
86872cb5 TG |
1371 | if (cfg->fc_flags & RTF_GATEWAY && |
1372 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1373 | continue; |
86872cb5 | 1374 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1375 | continue; |
d8d1f30b | 1376 | dst_hold(&rt->dst); |
c71099ac | 1377 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1378 | |
86872cb5 | 1379 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1380 | } |
1381 | } | |
c71099ac | 1382 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1383 | |
1384 | return err; | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | * Handle redirects | |
1389 | */ | |
a6279458 YH |
1390 | struct ip6rd_flowi { |
1391 | struct flowi fl; | |
1392 | struct in6_addr gateway; | |
1393 | }; | |
1394 | ||
8ed67789 DL |
1395 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1396 | struct fib6_table *table, | |
a6279458 YH |
1397 | struct flowi *fl, |
1398 | int flags) | |
1da177e4 | 1399 | { |
a6279458 YH |
1400 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1401 | struct rt6_info *rt; | |
e843b9e1 | 1402 | struct fib6_node *fn; |
c71099ac | 1403 | |
1da177e4 | 1404 | /* |
e843b9e1 YH |
1405 | * Get the "current" route for this destination and |
1406 | * check if the redirect has come from approriate router. | |
1407 | * | |
1408 | * RFC 2461 specifies that redirects should only be | |
1409 | * accepted if they come from the nexthop to the target. | |
1410 | * Due to the way the routes are chosen, this notion | |
1411 | * is a bit fuzzy and one might need to check all possible | |
1412 | * routes. | |
1da177e4 | 1413 | */ |
1da177e4 | 1414 | |
c71099ac | 1415 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1416 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1417 | restart: |
d8d1f30b | 1418 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1419 | /* |
1420 | * Current route is on-link; redirect is always invalid. | |
1421 | * | |
1422 | * Seems, previous statement is not true. It could | |
1423 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1424 | * But then router serving it might decide, that we should | |
1425 | * know truth 8)8) --ANK (980726). | |
1426 | */ | |
1427 | if (rt6_check_expired(rt)) | |
1428 | continue; | |
1429 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1430 | continue; | |
a6279458 | 1431 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1432 | continue; |
a6279458 | 1433 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1434 | continue; |
1435 | break; | |
1436 | } | |
a6279458 | 1437 | |
cb15d9c2 | 1438 | if (!rt) |
8ed67789 DL |
1439 | rt = net->ipv6.ip6_null_entry; |
1440 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1441 | out: |
d8d1f30b | 1442 | dst_hold(&rt->dst); |
a6279458 | 1443 | |
c71099ac | 1444 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1445 | |
a6279458 YH |
1446 | return rt; |
1447 | }; | |
1448 | ||
1449 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1450 | struct in6_addr *src, | |
1451 | struct in6_addr *gateway, | |
1452 | struct net_device *dev) | |
1453 | { | |
adaa70bb | 1454 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1455 | struct net *net = dev_net(dev); |
a6279458 YH |
1456 | struct ip6rd_flowi rdfl = { |
1457 | .fl = { | |
1458 | .oif = dev->ifindex, | |
1459 | .nl_u = { | |
1460 | .ip6_u = { | |
1461 | .daddr = *dest, | |
1462 | .saddr = *src, | |
1463 | }, | |
1464 | }, | |
1465 | }, | |
a6279458 | 1466 | }; |
adaa70bb | 1467 | |
86c36ce4 BH |
1468 | ipv6_addr_copy(&rdfl.gateway, gateway); |
1469 | ||
adaa70bb TG |
1470 | if (rt6_need_strict(dest)) |
1471 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1472 | |
5578689a | 1473 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1474 | flags, __ip6_route_redirect); |
a6279458 YH |
1475 | } |
1476 | ||
1477 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1478 | struct in6_addr *saddr, | |
1479 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1480 | { | |
1481 | struct rt6_info *rt, *nrt = NULL; | |
1482 | struct netevent_redirect netevent; | |
c346dca1 | 1483 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1484 | |
1485 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1486 | ||
8ed67789 | 1487 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1488 | if (net_ratelimit()) |
1489 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1490 | "for redirect target\n"); | |
a6279458 | 1491 | goto out; |
1da177e4 LT |
1492 | } |
1493 | ||
1da177e4 LT |
1494 | /* |
1495 | * We have finally decided to accept it. | |
1496 | */ | |
1497 | ||
1ab1457c | 1498 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1499 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1500 | NEIGH_UPDATE_F_OVERRIDE| | |
1501 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1502 | NEIGH_UPDATE_F_ISROUTER)) | |
1503 | ); | |
1504 | ||
1505 | /* | |
1506 | * Redirect received -> path was valid. | |
1507 | * Look, redirects are sent only in response to data packets, | |
1508 | * so that this nexthop apparently is reachable. --ANK | |
1509 | */ | |
d8d1f30b | 1510 | dst_confirm(&rt->dst); |
1da177e4 LT |
1511 | |
1512 | /* Duplicate redirect: silently ignore. */ | |
d8d1f30b | 1513 | if (neigh == rt->dst.neighbour) |
1da177e4 LT |
1514 | goto out; |
1515 | ||
1516 | nrt = ip6_rt_copy(rt); | |
1517 | if (nrt == NULL) | |
1518 | goto out; | |
1519 | ||
1520 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1521 | if (on_link) | |
1522 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1523 | ||
1524 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1525 | nrt->rt6i_dst.plen = 128; | |
d8d1f30b | 1526 | nrt->dst.flags |= DST_HOST; |
1da177e4 LT |
1527 | |
1528 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1529 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1530 | /* Reset pmtu, it may be better */ | |
d8d1f30b CG |
1531 | nrt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); |
1532 | nrt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), | |
1533 | dst_mtu(&nrt->dst)); | |
1da177e4 | 1534 | |
40e22e8f | 1535 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1536 | goto out; |
1537 | ||
d8d1f30b CG |
1538 | netevent.old = &rt->dst; |
1539 | netevent.new = &nrt->dst; | |
8d71740c TT |
1540 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1541 | ||
1da177e4 | 1542 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1543 | ip6_del_rt(rt); |
1da177e4 LT |
1544 | return; |
1545 | } | |
1546 | ||
1547 | out: | |
d8d1f30b | 1548 | dst_release(&rt->dst); |
1da177e4 LT |
1549 | } |
1550 | ||
1551 | /* | |
1552 | * Handle ICMP "packet too big" messages | |
1553 | * i.e. Path MTU discovery | |
1554 | */ | |
1555 | ||
1556 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1557 | struct net_device *dev, u32 pmtu) | |
1558 | { | |
1559 | struct rt6_info *rt, *nrt; | |
c346dca1 | 1560 | struct net *net = dev_net(dev); |
1da177e4 LT |
1561 | int allfrag = 0; |
1562 | ||
5578689a | 1563 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1564 | if (rt == NULL) |
1565 | return; | |
1566 | ||
d8d1f30b | 1567 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1568 | goto out; |
1569 | ||
1570 | if (pmtu < IPV6_MIN_MTU) { | |
1571 | /* | |
1ab1457c | 1572 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1573 | * MTU (1280) and a fragment header should always be included |
1574 | * after a node receiving Too Big message reporting PMTU is | |
1575 | * less than the IPv6 Minimum Link MTU. | |
1576 | */ | |
1577 | pmtu = IPV6_MIN_MTU; | |
1578 | allfrag = 1; | |
1579 | } | |
1580 | ||
1581 | /* New mtu received -> path was valid. | |
1582 | They are sent only in response to data packets, | |
1583 | so that this nexthop apparently is reachable. --ANK | |
1584 | */ | |
d8d1f30b | 1585 | dst_confirm(&rt->dst); |
1da177e4 LT |
1586 | |
1587 | /* Host route. If it is static, it would be better | |
1588 | not to override it, but add new one, so that | |
1589 | when cache entry will expire old pmtu | |
1590 | would return automatically. | |
1591 | */ | |
1592 | if (rt->rt6i_flags & RTF_CACHE) { | |
d8d1f30b | 1593 | rt->dst.metrics[RTAX_MTU-1] = pmtu; |
1da177e4 | 1594 | if (allfrag) |
d8d1f30b CG |
1595 | rt->dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
1596 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1da177e4 LT |
1597 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1598 | goto out; | |
1599 | } | |
1600 | ||
1601 | /* Network route. | |
1602 | Two cases are possible: | |
1603 | 1. It is connected route. Action: COW | |
1604 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1605 | */ | |
d5315b50 | 1606 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1607 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1608 | else |
1609 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1610 | |
d5315b50 | 1611 | if (nrt) { |
d8d1f30b | 1612 | nrt->dst.metrics[RTAX_MTU-1] = pmtu; |
a1e78363 | 1613 | if (allfrag) |
d8d1f30b | 1614 | nrt->dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
a1e78363 YH |
1615 | |
1616 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1617 | * happened within 5 mins, the recommended timer is 10 mins. | |
1618 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1619 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1620 | * and detecting PMTU increase will be automatically happened. | |
1621 | */ | |
d8d1f30b | 1622 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1623 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1624 | ||
40e22e8f | 1625 | ip6_ins_rt(nrt); |
1da177e4 | 1626 | } |
1da177e4 | 1627 | out: |
d8d1f30b | 1628 | dst_release(&rt->dst); |
1da177e4 LT |
1629 | } |
1630 | ||
1631 | /* | |
1632 | * Misc support functions | |
1633 | */ | |
1634 | ||
1635 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1636 | { | |
c346dca1 | 1637 | struct net *net = dev_net(ort->rt6i_dev); |
86393e52 | 1638 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1639 | |
1640 | if (rt) { | |
d8d1f30b CG |
1641 | rt->dst.input = ort->dst.input; |
1642 | rt->dst.output = ort->dst.output; | |
1643 | ||
1644 | memcpy(rt->dst.metrics, ort->dst.metrics, RTAX_MAX*sizeof(u32)); | |
1645 | rt->dst.error = ort->dst.error; | |
1646 | rt->dst.dev = ort->dst.dev; | |
1647 | if (rt->dst.dev) | |
1648 | dev_hold(rt->dst.dev); | |
1da177e4 LT |
1649 | rt->rt6i_idev = ort->rt6i_idev; |
1650 | if (rt->rt6i_idev) | |
1651 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1652 | rt->dst.lastuse = jiffies; |
1da177e4 LT |
1653 | rt->rt6i_expires = 0; |
1654 | ||
1655 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1656 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1657 | rt->rt6i_metric = 0; | |
1658 | ||
1659 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1660 | #ifdef CONFIG_IPV6_SUBTREES | |
1661 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1662 | #endif | |
c71099ac | 1663 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1664 | } |
1665 | return rt; | |
1666 | } | |
1667 | ||
70ceb4f5 | 1668 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1669 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1670 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1671 | struct in6_addr *gwaddr, int ifindex) |
1672 | { | |
1673 | struct fib6_node *fn; | |
1674 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1675 | struct fib6_table *table; |
1676 | ||
efa2cea0 | 1677 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1678 | if (table == NULL) |
1679 | return NULL; | |
70ceb4f5 | 1680 | |
c71099ac TG |
1681 | write_lock_bh(&table->tb6_lock); |
1682 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1683 | if (!fn) |
1684 | goto out; | |
1685 | ||
d8d1f30b | 1686 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
70ceb4f5 YH |
1687 | if (rt->rt6i_dev->ifindex != ifindex) |
1688 | continue; | |
1689 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1690 | continue; | |
1691 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1692 | continue; | |
d8d1f30b | 1693 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1694 | break; |
1695 | } | |
1696 | out: | |
c71099ac | 1697 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1698 | return rt; |
1699 | } | |
1700 | ||
efa2cea0 DL |
1701 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1702 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1703 | struct in6_addr *gwaddr, int ifindex, |
1704 | unsigned pref) | |
1705 | { | |
86872cb5 TG |
1706 | struct fib6_config cfg = { |
1707 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1708 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1709 | .fc_ifindex = ifindex, |
1710 | .fc_dst_len = prefixlen, | |
1711 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1712 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1713 | .fc_nlinfo.pid = 0, |
1714 | .fc_nlinfo.nlh = NULL, | |
1715 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1716 | }; |
1717 | ||
1718 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1719 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1720 | |
e317da96 YH |
1721 | /* We should treat it as a default route if prefix length is 0. */ |
1722 | if (!prefixlen) | |
86872cb5 | 1723 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1724 | |
86872cb5 | 1725 | ip6_route_add(&cfg); |
70ceb4f5 | 1726 | |
efa2cea0 | 1727 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1728 | } |
1729 | #endif | |
1730 | ||
1da177e4 | 1731 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1732 | { |
1da177e4 | 1733 | struct rt6_info *rt; |
c71099ac | 1734 | struct fib6_table *table; |
1da177e4 | 1735 | |
c346dca1 | 1736 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1737 | if (table == NULL) |
1738 | return NULL; | |
1da177e4 | 1739 | |
c71099ac | 1740 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1741 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
1da177e4 | 1742 | if (dev == rt->rt6i_dev && |
045927ff | 1743 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1744 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1745 | break; | |
1746 | } | |
1747 | if (rt) | |
d8d1f30b | 1748 | dst_hold(&rt->dst); |
c71099ac | 1749 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1750 | return rt; |
1751 | } | |
1752 | ||
1753 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1754 | struct net_device *dev, |
1755 | unsigned int pref) | |
1da177e4 | 1756 | { |
86872cb5 TG |
1757 | struct fib6_config cfg = { |
1758 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1759 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1760 | .fc_ifindex = dev->ifindex, |
1761 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1762 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1763 | .fc_nlinfo.pid = 0, |
1764 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1765 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1766 | }; |
1da177e4 | 1767 | |
86872cb5 | 1768 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1769 | |
86872cb5 | 1770 | ip6_route_add(&cfg); |
1da177e4 | 1771 | |
1da177e4 LT |
1772 | return rt6_get_dflt_router(gwaddr, dev); |
1773 | } | |
1774 | ||
7b4da532 | 1775 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1776 | { |
1777 | struct rt6_info *rt; | |
c71099ac TG |
1778 | struct fib6_table *table; |
1779 | ||
1780 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1781 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1782 | if (table == NULL) |
1783 | return; | |
1da177e4 LT |
1784 | |
1785 | restart: | |
c71099ac | 1786 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1787 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1788 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1789 | dst_hold(&rt->dst); |
c71099ac | 1790 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1791 | ip6_del_rt(rt); |
1da177e4 LT |
1792 | goto restart; |
1793 | } | |
1794 | } | |
c71099ac | 1795 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1796 | } |
1797 | ||
5578689a DL |
1798 | static void rtmsg_to_fib6_config(struct net *net, |
1799 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1800 | struct fib6_config *cfg) |
1801 | { | |
1802 | memset(cfg, 0, sizeof(*cfg)); | |
1803 | ||
1804 | cfg->fc_table = RT6_TABLE_MAIN; | |
1805 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1806 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1807 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1808 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1809 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1810 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1811 | ||
5578689a | 1812 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1813 | |
86872cb5 TG |
1814 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1815 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1816 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1817 | } | |
1818 | ||
5578689a | 1819 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1820 | { |
86872cb5 | 1821 | struct fib6_config cfg; |
1da177e4 LT |
1822 | struct in6_rtmsg rtmsg; |
1823 | int err; | |
1824 | ||
1825 | switch(cmd) { | |
1826 | case SIOCADDRT: /* Add a route */ | |
1827 | case SIOCDELRT: /* Delete a route */ | |
1828 | if (!capable(CAP_NET_ADMIN)) | |
1829 | return -EPERM; | |
1830 | err = copy_from_user(&rtmsg, arg, | |
1831 | sizeof(struct in6_rtmsg)); | |
1832 | if (err) | |
1833 | return -EFAULT; | |
86872cb5 | 1834 | |
5578689a | 1835 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1836 | |
1da177e4 LT |
1837 | rtnl_lock(); |
1838 | switch (cmd) { | |
1839 | case SIOCADDRT: | |
86872cb5 | 1840 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1841 | break; |
1842 | case SIOCDELRT: | |
86872cb5 | 1843 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1844 | break; |
1845 | default: | |
1846 | err = -EINVAL; | |
1847 | } | |
1848 | rtnl_unlock(); | |
1849 | ||
1850 | return err; | |
3ff50b79 | 1851 | } |
1da177e4 LT |
1852 | |
1853 | return -EINVAL; | |
1854 | } | |
1855 | ||
1856 | /* | |
1857 | * Drop the packet on the floor | |
1858 | */ | |
1859 | ||
d5fdd6ba | 1860 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1861 | { |
612f09e8 | 1862 | int type; |
adf30907 | 1863 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1864 | switch (ipstats_mib_noroutes) { |
1865 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1866 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1867 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
1868 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1869 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1870 | break; |
1871 | } | |
1872 | /* FALLTHROUGH */ | |
1873 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1874 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1875 | ipstats_mib_noroutes); | |
612f09e8 YH |
1876 | break; |
1877 | } | |
3ffe533c | 1878 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
1879 | kfree_skb(skb); |
1880 | return 0; | |
1881 | } | |
1882 | ||
9ce8ade0 TG |
1883 | static int ip6_pkt_discard(struct sk_buff *skb) |
1884 | { | |
612f09e8 | 1885 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1886 | } |
1887 | ||
20380731 | 1888 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 1889 | { |
adf30907 | 1890 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1891 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1892 | } |
1893 | ||
6723ab54 DM |
1894 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1895 | ||
9ce8ade0 TG |
1896 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1897 | { | |
612f09e8 | 1898 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1899 | } |
1900 | ||
1901 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1902 | { | |
adf30907 | 1903 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1904 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1905 | } |
1906 | ||
6723ab54 DM |
1907 | #endif |
1908 | ||
1da177e4 LT |
1909 | /* |
1910 | * Allocate a dst for local (unicast / anycast) address. | |
1911 | */ | |
1912 | ||
1913 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1914 | const struct in6_addr *addr, | |
1915 | int anycast) | |
1916 | { | |
c346dca1 | 1917 | struct net *net = dev_net(idev->dev); |
86393e52 | 1918 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
14deae41 | 1919 | struct neighbour *neigh; |
1da177e4 LT |
1920 | |
1921 | if (rt == NULL) | |
1922 | return ERR_PTR(-ENOMEM); | |
1923 | ||
5578689a | 1924 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1925 | in6_dev_hold(idev); |
1926 | ||
d8d1f30b CG |
1927 | rt->dst.flags = DST_HOST; |
1928 | rt->dst.input = ip6_input; | |
1929 | rt->dst.output = ip6_output; | |
5578689a | 1930 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 | 1931 | rt->rt6i_idev = idev; |
d8d1f30b CG |
1932 | rt->dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); |
1933 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->dst)); | |
1934 | rt->dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1935 | rt->dst.obsolete = -1; | |
1da177e4 LT |
1936 | |
1937 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1938 | if (anycast) |
1939 | rt->rt6i_flags |= RTF_ANYCAST; | |
1940 | else | |
1da177e4 | 1941 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
1942 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
1943 | if (IS_ERR(neigh)) { | |
d8d1f30b | 1944 | dst_free(&rt->dst); |
14deae41 DM |
1945 | |
1946 | /* We are casting this because that is the return | |
1947 | * value type. But an errno encoded pointer is the | |
1948 | * same regardless of the underlying pointer type, | |
1949 | * and that's what we are returning. So this is OK. | |
1950 | */ | |
1951 | return (struct rt6_info *) neigh; | |
1da177e4 | 1952 | } |
14deae41 | 1953 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
1954 | |
1955 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1956 | rt->rt6i_dst.plen = 128; | |
5578689a | 1957 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 1958 | |
d8d1f30b | 1959 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
1960 | |
1961 | return rt; | |
1962 | } | |
1963 | ||
8ed67789 DL |
1964 | struct arg_dev_net { |
1965 | struct net_device *dev; | |
1966 | struct net *net; | |
1967 | }; | |
1968 | ||
1da177e4 LT |
1969 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1970 | { | |
8ed67789 DL |
1971 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1972 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1973 | ||
1974 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1975 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1976 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1977 | return -1; | |
1978 | } | |
1979 | return 0; | |
1980 | } | |
1981 | ||
f3db4851 | 1982 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1983 | { |
8ed67789 DL |
1984 | struct arg_dev_net adn = { |
1985 | .dev = dev, | |
1986 | .net = net, | |
1987 | }; | |
1988 | ||
1989 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 1990 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
1991 | } |
1992 | ||
1993 | struct rt6_mtu_change_arg | |
1994 | { | |
1995 | struct net_device *dev; | |
1996 | unsigned mtu; | |
1997 | }; | |
1998 | ||
1999 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2000 | { | |
2001 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2002 | struct inet6_dev *idev; | |
c346dca1 | 2003 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
2004 | |
2005 | /* In IPv6 pmtu discovery is not optional, | |
2006 | so that RTAX_MTU lock cannot disable it. | |
2007 | We still use this lock to block changes | |
2008 | caused by addrconf/ndisc. | |
2009 | */ | |
2010 | ||
2011 | idev = __in6_dev_get(arg->dev); | |
2012 | if (idev == NULL) | |
2013 | return 0; | |
2014 | ||
2015 | /* For administrative MTU increase, there is no way to discover | |
2016 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2017 | Since RFC 1981 doesn't include administrative MTU increase | |
2018 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2019 | */ | |
2020 | /* | |
2021 | If new MTU is less than route PMTU, this new MTU will be the | |
2022 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2023 | decreases; if new MTU is greater than route PMTU, and the | |
2024 | old MTU is the lowest MTU in the path, update the route PMTU | |
2025 | to reflect the increase. In this case if the other nodes' MTU | |
2026 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2027 | PMTU discouvery. | |
2028 | */ | |
2029 | if (rt->rt6i_dev == arg->dev && | |
d8d1f30b CG |
2030 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2031 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2032 | (dst_mtu(&rt->dst) < arg->mtu && | |
2033 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
2034 | rt->dst.metrics[RTAX_MTU-1] = arg->mtu; | |
2035 | rt->dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); | |
566cfd8f | 2036 | } |
1da177e4 LT |
2037 | return 0; |
2038 | } | |
2039 | ||
2040 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2041 | { | |
c71099ac TG |
2042 | struct rt6_mtu_change_arg arg = { |
2043 | .dev = dev, | |
2044 | .mtu = mtu, | |
2045 | }; | |
1da177e4 | 2046 | |
c346dca1 | 2047 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2048 | } |
2049 | ||
ef7c79ed | 2050 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2051 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2052 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2053 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2054 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2055 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2056 | }; | |
2057 | ||
2058 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2059 | struct fib6_config *cfg) | |
1da177e4 | 2060 | { |
86872cb5 TG |
2061 | struct rtmsg *rtm; |
2062 | struct nlattr *tb[RTA_MAX+1]; | |
2063 | int err; | |
1da177e4 | 2064 | |
86872cb5 TG |
2065 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2066 | if (err < 0) | |
2067 | goto errout; | |
1da177e4 | 2068 | |
86872cb5 TG |
2069 | err = -EINVAL; |
2070 | rtm = nlmsg_data(nlh); | |
2071 | memset(cfg, 0, sizeof(*cfg)); | |
2072 | ||
2073 | cfg->fc_table = rtm->rtm_table; | |
2074 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2075 | cfg->fc_src_len = rtm->rtm_src_len; | |
2076 | cfg->fc_flags = RTF_UP; | |
2077 | cfg->fc_protocol = rtm->rtm_protocol; | |
2078 | ||
2079 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2080 | cfg->fc_flags |= RTF_REJECT; | |
2081 | ||
2082 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2083 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2084 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2085 | |
2086 | if (tb[RTA_GATEWAY]) { | |
2087 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2088 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2089 | } |
86872cb5 TG |
2090 | |
2091 | if (tb[RTA_DST]) { | |
2092 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2093 | ||
2094 | if (nla_len(tb[RTA_DST]) < plen) | |
2095 | goto errout; | |
2096 | ||
2097 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2098 | } |
86872cb5 TG |
2099 | |
2100 | if (tb[RTA_SRC]) { | |
2101 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2102 | ||
2103 | if (nla_len(tb[RTA_SRC]) < plen) | |
2104 | goto errout; | |
2105 | ||
2106 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2107 | } |
86872cb5 TG |
2108 | |
2109 | if (tb[RTA_OIF]) | |
2110 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2111 | ||
2112 | if (tb[RTA_PRIORITY]) | |
2113 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2114 | ||
2115 | if (tb[RTA_METRICS]) { | |
2116 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2117 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2118 | } |
86872cb5 TG |
2119 | |
2120 | if (tb[RTA_TABLE]) | |
2121 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2122 | ||
2123 | err = 0; | |
2124 | errout: | |
2125 | return err; | |
1da177e4 LT |
2126 | } |
2127 | ||
c127ea2c | 2128 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2129 | { |
86872cb5 TG |
2130 | struct fib6_config cfg; |
2131 | int err; | |
1da177e4 | 2132 | |
86872cb5 TG |
2133 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2134 | if (err < 0) | |
2135 | return err; | |
2136 | ||
2137 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2138 | } |
2139 | ||
c127ea2c | 2140 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2141 | { |
86872cb5 TG |
2142 | struct fib6_config cfg; |
2143 | int err; | |
1da177e4 | 2144 | |
86872cb5 TG |
2145 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2146 | if (err < 0) | |
2147 | return err; | |
2148 | ||
2149 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2150 | } |
2151 | ||
339bf98f TG |
2152 | static inline size_t rt6_nlmsg_size(void) |
2153 | { | |
2154 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2155 | + nla_total_size(16) /* RTA_SRC */ | |
2156 | + nla_total_size(16) /* RTA_DST */ | |
2157 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2158 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2159 | + nla_total_size(4) /* RTA_TABLE */ | |
2160 | + nla_total_size(4) /* RTA_IIF */ | |
2161 | + nla_total_size(4) /* RTA_OIF */ | |
2162 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2163 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2164 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2165 | } | |
2166 | ||
191cd582 BH |
2167 | static int rt6_fill_node(struct net *net, |
2168 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2169 | struct in6_addr *dst, struct in6_addr *src, |
2170 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2171 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2172 | { |
2173 | struct rtmsg *rtm; | |
2d7202bf | 2174 | struct nlmsghdr *nlh; |
e3703b3d | 2175 | long expires; |
9e762a4a | 2176 | u32 table; |
1da177e4 LT |
2177 | |
2178 | if (prefix) { /* user wants prefix routes only */ | |
2179 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2180 | /* success since this is not a prefix route */ | |
2181 | return 1; | |
2182 | } | |
2183 | } | |
2184 | ||
2d7202bf TG |
2185 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2186 | if (nlh == NULL) | |
26932566 | 2187 | return -EMSGSIZE; |
2d7202bf TG |
2188 | |
2189 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2190 | rtm->rtm_family = AF_INET6; |
2191 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2192 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2193 | rtm->rtm_tos = 0; | |
c71099ac | 2194 | if (rt->rt6i_table) |
9e762a4a | 2195 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2196 | else |
9e762a4a PM |
2197 | table = RT6_TABLE_UNSPEC; |
2198 | rtm->rtm_table = table; | |
2d7202bf | 2199 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2200 | if (rt->rt6i_flags&RTF_REJECT) |
2201 | rtm->rtm_type = RTN_UNREACHABLE; | |
2202 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2203 | rtm->rtm_type = RTN_LOCAL; | |
2204 | else | |
2205 | rtm->rtm_type = RTN_UNICAST; | |
2206 | rtm->rtm_flags = 0; | |
2207 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2208 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2209 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2210 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2211 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2212 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2213 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2214 | rtm->rtm_protocol = RTPROT_RA; | |
2215 | ||
2216 | if (rt->rt6i_flags&RTF_CACHE) | |
2217 | rtm->rtm_flags |= RTM_F_CLONED; | |
2218 | ||
2219 | if (dst) { | |
2d7202bf | 2220 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2221 | rtm->rtm_dst_len = 128; |
1da177e4 | 2222 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2223 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2224 | #ifdef CONFIG_IPV6_SUBTREES |
2225 | if (src) { | |
2d7202bf | 2226 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2227 | rtm->rtm_src_len = 128; |
1da177e4 | 2228 | } else if (rtm->rtm_src_len) |
2d7202bf | 2229 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2230 | #endif |
7bc570c8 YH |
2231 | if (iif) { |
2232 | #ifdef CONFIG_IPV6_MROUTE | |
2233 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2234 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2235 | if (err <= 0) { |
2236 | if (!nowait) { | |
2237 | if (err == 0) | |
2238 | return 0; | |
2239 | goto nla_put_failure; | |
2240 | } else { | |
2241 | if (err == -EMSGSIZE) | |
2242 | goto nla_put_failure; | |
2243 | } | |
2244 | } | |
2245 | } else | |
2246 | #endif | |
2247 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2248 | } else if (dst) { | |
d8d1f30b | 2249 | struct inet6_dev *idev = ip6_dst_idev(&rt->dst); |
1da177e4 | 2250 | struct in6_addr saddr_buf; |
191cd582 | 2251 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2252 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2253 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2254 | } |
2d7202bf | 2255 | |
d8d1f30b | 2256 | if (rtnetlink_put_metrics(skb, rt->dst.metrics) < 0) |
2d7202bf TG |
2257 | goto nla_put_failure; |
2258 | ||
d8d1f30b CG |
2259 | if (rt->dst.neighbour) |
2260 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->dst.neighbour->primary_key); | |
2d7202bf | 2261 | |
d8d1f30b | 2262 | if (rt->dst.dev) |
2d7202bf TG |
2263 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2264 | ||
2265 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2266 | |
36e3deae YH |
2267 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2268 | expires = 0; | |
2269 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2270 | expires = rt->rt6i_expires - jiffies; | |
2271 | else | |
2272 | expires = INT_MAX; | |
69cdf8f9 | 2273 | |
d8d1f30b CG |
2274 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2275 | expires, rt->dst.error) < 0) | |
e3703b3d | 2276 | goto nla_put_failure; |
2d7202bf TG |
2277 | |
2278 | return nlmsg_end(skb, nlh); | |
2279 | ||
2280 | nla_put_failure: | |
26932566 PM |
2281 | nlmsg_cancel(skb, nlh); |
2282 | return -EMSGSIZE; | |
1da177e4 LT |
2283 | } |
2284 | ||
1b43af54 | 2285 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2286 | { |
2287 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2288 | int prefix; | |
2289 | ||
2d7202bf TG |
2290 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2291 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2292 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2293 | } else | |
2294 | prefix = 0; | |
2295 | ||
191cd582 BH |
2296 | return rt6_fill_node(arg->net, |
2297 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2298 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2299 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2300 | } |
2301 | ||
c127ea2c | 2302 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2303 | { |
3b1e0a65 | 2304 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2305 | struct nlattr *tb[RTA_MAX+1]; |
2306 | struct rt6_info *rt; | |
1da177e4 | 2307 | struct sk_buff *skb; |
ab364a6f | 2308 | struct rtmsg *rtm; |
1da177e4 | 2309 | struct flowi fl; |
ab364a6f | 2310 | int err, iif = 0; |
1da177e4 | 2311 | |
ab364a6f TG |
2312 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2313 | if (err < 0) | |
2314 | goto errout; | |
1da177e4 | 2315 | |
ab364a6f | 2316 | err = -EINVAL; |
1da177e4 | 2317 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2318 | |
ab364a6f TG |
2319 | if (tb[RTA_SRC]) { |
2320 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2321 | goto errout; | |
2322 | ||
2323 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2324 | } | |
2325 | ||
2326 | if (tb[RTA_DST]) { | |
2327 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2328 | goto errout; | |
2329 | ||
2330 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2331 | } | |
2332 | ||
2333 | if (tb[RTA_IIF]) | |
2334 | iif = nla_get_u32(tb[RTA_IIF]); | |
2335 | ||
2336 | if (tb[RTA_OIF]) | |
2337 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2338 | |
2339 | if (iif) { | |
2340 | struct net_device *dev; | |
5578689a | 2341 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2342 | if (!dev) { |
2343 | err = -ENODEV; | |
ab364a6f | 2344 | goto errout; |
1da177e4 LT |
2345 | } |
2346 | } | |
2347 | ||
ab364a6f TG |
2348 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2349 | if (skb == NULL) { | |
2350 | err = -ENOBUFS; | |
2351 | goto errout; | |
2352 | } | |
1da177e4 | 2353 | |
ab364a6f TG |
2354 | /* Reserve room for dummy headers, this skb can pass |
2355 | through good chunk of routing engine. | |
2356 | */ | |
459a98ed | 2357 | skb_reset_mac_header(skb); |
ab364a6f | 2358 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2359 | |
8a3edd80 | 2360 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
d8d1f30b | 2361 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2362 | |
191cd582 | 2363 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2364 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2365 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2366 | if (err < 0) { |
ab364a6f TG |
2367 | kfree_skb(skb); |
2368 | goto errout; | |
1da177e4 LT |
2369 | } |
2370 | ||
5578689a | 2371 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2372 | errout: |
1da177e4 | 2373 | return err; |
1da177e4 LT |
2374 | } |
2375 | ||
86872cb5 | 2376 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2377 | { |
2378 | struct sk_buff *skb; | |
5578689a | 2379 | struct net *net = info->nl_net; |
528c4ceb DL |
2380 | u32 seq; |
2381 | int err; | |
2382 | ||
2383 | err = -ENOBUFS; | |
2384 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2385 | |
339bf98f | 2386 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2387 | if (skb == NULL) |
2388 | goto errout; | |
2389 | ||
191cd582 | 2390 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2391 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2392 | if (err < 0) { |
2393 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2394 | WARN_ON(err == -EMSGSIZE); | |
2395 | kfree_skb(skb); | |
2396 | goto errout; | |
2397 | } | |
1ce85fe4 PNA |
2398 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2399 | info->nlh, gfp_any()); | |
2400 | return; | |
21713ebc TG |
2401 | errout: |
2402 | if (err < 0) | |
5578689a | 2403 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2404 | } |
2405 | ||
8ed67789 DL |
2406 | static int ip6_route_dev_notify(struct notifier_block *this, |
2407 | unsigned long event, void *data) | |
2408 | { | |
2409 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2410 | struct net *net = dev_net(dev); |
8ed67789 DL |
2411 | |
2412 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2413 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2414 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2415 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2416 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2417 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2418 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2419 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2420 | #endif | |
2421 | } | |
2422 | ||
2423 | return NOTIFY_OK; | |
2424 | } | |
2425 | ||
1da177e4 LT |
2426 | /* |
2427 | * /proc | |
2428 | */ | |
2429 | ||
2430 | #ifdef CONFIG_PROC_FS | |
2431 | ||
2432 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2433 | ||
2434 | struct rt6_proc_arg | |
2435 | { | |
2436 | char *buffer; | |
2437 | int offset; | |
2438 | int length; | |
2439 | int skip; | |
2440 | int len; | |
2441 | }; | |
2442 | ||
2443 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2444 | { | |
33120b30 | 2445 | struct seq_file *m = p_arg; |
1da177e4 | 2446 | |
4b7a4274 | 2447 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2448 | |
2449 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2450 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2451 | #else |
33120b30 | 2452 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2453 | #endif |
2454 | ||
2455 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2456 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2457 | } else { |
33120b30 | 2458 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2459 | } |
33120b30 | 2460 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2461 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2462 | rt->dst.__use, rt->rt6i_flags, | |
33120b30 | 2463 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
1da177e4 LT |
2464 | return 0; |
2465 | } | |
2466 | ||
33120b30 | 2467 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2468 | { |
f3db4851 DL |
2469 | struct net *net = (struct net *)m->private; |
2470 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2471 | return 0; |
2472 | } | |
1da177e4 | 2473 | |
33120b30 AD |
2474 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2475 | { | |
de05c557 | 2476 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2477 | } |
2478 | ||
33120b30 AD |
2479 | static const struct file_operations ipv6_route_proc_fops = { |
2480 | .owner = THIS_MODULE, | |
2481 | .open = ipv6_route_open, | |
2482 | .read = seq_read, | |
2483 | .llseek = seq_lseek, | |
b6fcbdb4 | 2484 | .release = single_release_net, |
33120b30 AD |
2485 | }; |
2486 | ||
1da177e4 LT |
2487 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2488 | { | |
69ddb805 | 2489 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2490 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2491 | net->ipv6.rt6_stats->fib_nodes, |
2492 | net->ipv6.rt6_stats->fib_route_nodes, | |
2493 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2494 | net->ipv6.rt6_stats->fib_rt_entries, | |
2495 | net->ipv6.rt6_stats->fib_rt_cache, | |
86393e52 | 2496 | atomic_read(&net->ipv6.ip6_dst_ops.entries), |
69ddb805 | 2497 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2498 | |
2499 | return 0; | |
2500 | } | |
2501 | ||
2502 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2503 | { | |
de05c557 | 2504 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2505 | } |
2506 | ||
9a32144e | 2507 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2508 | .owner = THIS_MODULE, |
2509 | .open = rt6_stats_seq_open, | |
2510 | .read = seq_read, | |
2511 | .llseek = seq_lseek, | |
b6fcbdb4 | 2512 | .release = single_release_net, |
1da177e4 LT |
2513 | }; |
2514 | #endif /* CONFIG_PROC_FS */ | |
2515 | ||
2516 | #ifdef CONFIG_SYSCTL | |
2517 | ||
1da177e4 | 2518 | static |
8d65af78 | 2519 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2520 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2521 | { | |
5b7c931d DL |
2522 | struct net *net = current->nsproxy->net_ns; |
2523 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 | 2524 | if (write) { |
8d65af78 | 2525 | proc_dointvec(ctl, write, buffer, lenp, ppos); |
5b7c931d | 2526 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2527 | return 0; |
2528 | } else | |
2529 | return -EINVAL; | |
2530 | } | |
2531 | ||
760f2d01 | 2532 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2533 | { |
1da177e4 | 2534 | .procname = "flush", |
4990509f | 2535 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2536 | .maxlen = sizeof(int), |
89c8b3a1 | 2537 | .mode = 0200, |
6d9f239a | 2538 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2539 | }, |
2540 | { | |
1da177e4 | 2541 | .procname = "gc_thresh", |
9a7ec3a9 | 2542 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2543 | .maxlen = sizeof(int), |
2544 | .mode = 0644, | |
6d9f239a | 2545 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2546 | }, |
2547 | { | |
1da177e4 | 2548 | .procname = "max_size", |
4990509f | 2549 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2550 | .maxlen = sizeof(int), |
2551 | .mode = 0644, | |
6d9f239a | 2552 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2553 | }, |
2554 | { | |
1da177e4 | 2555 | .procname = "gc_min_interval", |
4990509f | 2556 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2557 | .maxlen = sizeof(int), |
2558 | .mode = 0644, | |
6d9f239a | 2559 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2560 | }, |
2561 | { | |
1da177e4 | 2562 | .procname = "gc_timeout", |
4990509f | 2563 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2564 | .maxlen = sizeof(int), |
2565 | .mode = 0644, | |
6d9f239a | 2566 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2567 | }, |
2568 | { | |
1da177e4 | 2569 | .procname = "gc_interval", |
4990509f | 2570 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2571 | .maxlen = sizeof(int), |
2572 | .mode = 0644, | |
6d9f239a | 2573 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2574 | }, |
2575 | { | |
1da177e4 | 2576 | .procname = "gc_elasticity", |
4990509f | 2577 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2578 | .maxlen = sizeof(int), |
2579 | .mode = 0644, | |
6d9f239a | 2580 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2581 | }, |
2582 | { | |
1da177e4 | 2583 | .procname = "mtu_expires", |
4990509f | 2584 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2585 | .maxlen = sizeof(int), |
2586 | .mode = 0644, | |
6d9f239a | 2587 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2588 | }, |
2589 | { | |
1da177e4 | 2590 | .procname = "min_adv_mss", |
4990509f | 2591 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2592 | .maxlen = sizeof(int), |
2593 | .mode = 0644, | |
6d9f239a | 2594 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2595 | }, |
2596 | { | |
1da177e4 | 2597 | .procname = "gc_min_interval_ms", |
4990509f | 2598 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2599 | .maxlen = sizeof(int), |
2600 | .mode = 0644, | |
6d9f239a | 2601 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2602 | }, |
f8572d8f | 2603 | { } |
1da177e4 LT |
2604 | }; |
2605 | ||
2c8c1e72 | 2606 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2607 | { |
2608 | struct ctl_table *table; | |
2609 | ||
2610 | table = kmemdup(ipv6_route_table_template, | |
2611 | sizeof(ipv6_route_table_template), | |
2612 | GFP_KERNEL); | |
5ee09105 YH |
2613 | |
2614 | if (table) { | |
2615 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
86393e52 | 2616 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2617 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2618 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2619 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2620 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2621 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2622 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2623 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2624 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2625 | } |
2626 | ||
760f2d01 DL |
2627 | return table; |
2628 | } | |
1da177e4 LT |
2629 | #endif |
2630 | ||
2c8c1e72 | 2631 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2632 | { |
633d424b | 2633 | int ret = -ENOMEM; |
8ed67789 | 2634 | |
86393e52 AD |
2635 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2636 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2637 | |
8ed67789 DL |
2638 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2639 | sizeof(*net->ipv6.ip6_null_entry), | |
2640 | GFP_KERNEL); | |
2641 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2642 | goto out_ip6_dst_ops; |
d8d1f30b | 2643 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2644 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2645 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2646 | |
2647 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2648 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2649 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2650 | GFP_KERNEL); | |
68fffc67 PZ |
2651 | if (!net->ipv6.ip6_prohibit_entry) |
2652 | goto out_ip6_null_entry; | |
d8d1f30b | 2653 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2654 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2655 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2656 | |
2657 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2658 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2659 | GFP_KERNEL); | |
68fffc67 PZ |
2660 | if (!net->ipv6.ip6_blk_hole_entry) |
2661 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2662 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2663 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2664 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2665 | #endif |
2666 | ||
b339a47c PZ |
2667 | net->ipv6.sysctl.flush_delay = 0; |
2668 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2669 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2670 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2671 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2672 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2673 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2674 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2675 | ||
cdb18761 DL |
2676 | #ifdef CONFIG_PROC_FS |
2677 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2678 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2679 | #endif | |
6891a346 BT |
2680 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2681 | ||
8ed67789 DL |
2682 | ret = 0; |
2683 | out: | |
2684 | return ret; | |
f2fc6a54 | 2685 | |
68fffc67 PZ |
2686 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2687 | out_ip6_prohibit_entry: | |
2688 | kfree(net->ipv6.ip6_prohibit_entry); | |
2689 | out_ip6_null_entry: | |
2690 | kfree(net->ipv6.ip6_null_entry); | |
2691 | #endif | |
f2fc6a54 | 2692 | out_ip6_dst_ops: |
f2fc6a54 | 2693 | goto out; |
cdb18761 DL |
2694 | } |
2695 | ||
2c8c1e72 | 2696 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2697 | { |
2698 | #ifdef CONFIG_PROC_FS | |
2699 | proc_net_remove(net, "ipv6_route"); | |
2700 | proc_net_remove(net, "rt6_stats"); | |
2701 | #endif | |
8ed67789 DL |
2702 | kfree(net->ipv6.ip6_null_entry); |
2703 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2704 | kfree(net->ipv6.ip6_prohibit_entry); | |
2705 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2706 | #endif | |
cdb18761 DL |
2707 | } |
2708 | ||
2709 | static struct pernet_operations ip6_route_net_ops = { | |
2710 | .init = ip6_route_net_init, | |
2711 | .exit = ip6_route_net_exit, | |
2712 | }; | |
2713 | ||
8ed67789 DL |
2714 | static struct notifier_block ip6_route_dev_notifier = { |
2715 | .notifier_call = ip6_route_dev_notify, | |
2716 | .priority = 0, | |
2717 | }; | |
2718 | ||
433d49c3 | 2719 | int __init ip6_route_init(void) |
1da177e4 | 2720 | { |
433d49c3 DL |
2721 | int ret; |
2722 | ||
9a7ec3a9 DL |
2723 | ret = -ENOMEM; |
2724 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2725 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2726 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2727 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2728 | goto out; |
14e50e57 | 2729 | |
8ed67789 DL |
2730 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2731 | if (ret) | |
bdb3289f | 2732 | goto out_kmem_cache; |
bdb3289f | 2733 | |
5dc121e9 AE |
2734 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2735 | ||
8ed67789 DL |
2736 | /* Registering of the loopback is done before this portion of code, |
2737 | * the loopback reference in rt6_info will not be taken, do it | |
2738 | * manually for init_net */ | |
d8d1f30b | 2739 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2740 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2741 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2742 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2743 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2744 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2745 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2746 | #endif | |
433d49c3 DL |
2747 | ret = fib6_init(); |
2748 | if (ret) | |
8ed67789 | 2749 | goto out_register_subsys; |
433d49c3 | 2750 | |
433d49c3 DL |
2751 | ret = xfrm6_init(); |
2752 | if (ret) | |
cdb18761 | 2753 | goto out_fib6_init; |
c35b7e72 | 2754 | |
433d49c3 DL |
2755 | ret = fib6_rules_init(); |
2756 | if (ret) | |
2757 | goto xfrm6_init; | |
7e5449c2 | 2758 | |
433d49c3 DL |
2759 | ret = -ENOBUFS; |
2760 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2761 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2762 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2763 | goto fib6_rules_init; | |
c127ea2c | 2764 | |
8ed67789 | 2765 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2766 | if (ret) |
2767 | goto fib6_rules_init; | |
8ed67789 | 2768 | |
433d49c3 DL |
2769 | out: |
2770 | return ret; | |
2771 | ||
2772 | fib6_rules_init: | |
433d49c3 DL |
2773 | fib6_rules_cleanup(); |
2774 | xfrm6_init: | |
433d49c3 | 2775 | xfrm6_fini(); |
433d49c3 | 2776 | out_fib6_init: |
433d49c3 | 2777 | fib6_gc_cleanup(); |
8ed67789 DL |
2778 | out_register_subsys: |
2779 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2780 | out_kmem_cache: |
f2fc6a54 | 2781 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2782 | goto out; |
1da177e4 LT |
2783 | } |
2784 | ||
2785 | void ip6_route_cleanup(void) | |
2786 | { | |
8ed67789 | 2787 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2788 | fib6_rules_cleanup(); |
1da177e4 | 2789 | xfrm6_fini(); |
1da177e4 | 2790 | fib6_gc_cleanup(); |
8ed67789 | 2791 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2792 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2793 | } |