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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
7bc570c8 | 37 | #include <linux/mroute6.h> |
1da177e4 | 38 | #include <linux/init.h> |
1da177e4 | 39 | #include <linux/if_arp.h> |
1da177e4 LT |
40 | #include <linux/proc_fs.h> |
41 | #include <linux/seq_file.h> | |
5b7c931d | 42 | #include <linux/nsproxy.h> |
457c4cbc | 43 | #include <net/net_namespace.h> |
1da177e4 LT |
44 | #include <net/snmp.h> |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_fib.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/tcp.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/xfrm.h> | |
8d71740c | 54 | #include <net/netevent.h> |
21713ebc | 55 | #include <net/netlink.h> |
1da177e4 LT |
56 | |
57 | #include <asm/uaccess.h> | |
58 | ||
59 | #ifdef CONFIG_SYSCTL | |
60 | #include <linux/sysctl.h> | |
61 | #endif | |
62 | ||
63 | /* Set to 3 to get tracing. */ | |
64 | #define RT6_DEBUG 2 | |
65 | ||
66 | #if RT6_DEBUG >= 3 | |
67 | #define RDBG(x) printk x | |
68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
69 | #else | |
70 | #define RDBG(x) | |
71 | #define RT6_TRACE(x...) do { ; } while (0) | |
72 | #endif | |
73 | ||
519fbd87 | 74 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 75 | |
1da177e4 LT |
76 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
78 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
79 | static void ip6_dst_destroy(struct dst_entry *); | |
80 | static void ip6_dst_ifdown(struct dst_entry *, | |
81 | struct net_device *dev, int how); | |
569d3645 | 82 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
83 | |
84 | static int ip6_pkt_discard(struct sk_buff *skb); | |
85 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
86 | static void ip6_link_failure(struct sk_buff *skb); | |
87 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
88 | ||
70ceb4f5 | 89 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
90 | static struct rt6_info *rt6_add_route_info(struct net *net, |
91 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
92 | struct in6_addr *gwaddr, int ifindex, |
93 | unsigned pref); | |
efa2cea0 DL |
94 | static struct rt6_info *rt6_get_route_info(struct net *net, |
95 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
96 | struct in6_addr *gwaddr, int ifindex); |
97 | #endif | |
98 | ||
9a7ec3a9 | 99 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 100 | .family = AF_INET6, |
09640e63 | 101 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
102 | .gc = ip6_dst_gc, |
103 | .gc_thresh = 1024, | |
104 | .check = ip6_dst_check, | |
105 | .destroy = ip6_dst_destroy, | |
106 | .ifdown = ip6_dst_ifdown, | |
107 | .negative_advice = ip6_negative_advice, | |
108 | .link_failure = ip6_link_failure, | |
109 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 110 | .local_out = __ip6_local_out, |
e2422970 | 111 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
112 | }; |
113 | ||
14e50e57 DM |
114 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
115 | { | |
116 | } | |
117 | ||
118 | static struct dst_ops ip6_dst_blackhole_ops = { | |
119 | .family = AF_INET6, | |
09640e63 | 120 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
121 | .destroy = ip6_dst_destroy, |
122 | .check = ip6_dst_check, | |
123 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
e2422970 | 124 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
125 | }; |
126 | ||
bdb3289f | 127 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
128 | .u = { |
129 | .dst = { | |
130 | .__refcnt = ATOMIC_INIT(1), | |
131 | .__use = 1, | |
1da177e4 LT |
132 | .obsolete = -1, |
133 | .error = -ENETUNREACH, | |
134 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
135 | .input = ip6_pkt_discard, | |
136 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
137 | } |
138 | }, | |
139 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
140 | .rt6i_metric = ~(u32) 0, | |
141 | .rt6i_ref = ATOMIC_INIT(1), | |
142 | }; | |
143 | ||
101367c2 TG |
144 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
145 | ||
6723ab54 DM |
146 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
147 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 148 | |
280a34c8 | 149 | static struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
150 | .u = { |
151 | .dst = { | |
152 | .__refcnt = ATOMIC_INIT(1), | |
153 | .__use = 1, | |
101367c2 TG |
154 | .obsolete = -1, |
155 | .error = -EACCES, | |
156 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
157 | .input = ip6_pkt_prohibit, |
158 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
159 | } |
160 | }, | |
161 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
162 | .rt6i_metric = ~(u32) 0, | |
163 | .rt6i_ref = ATOMIC_INIT(1), | |
164 | }; | |
165 | ||
bdb3289f | 166 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
167 | .u = { |
168 | .dst = { | |
169 | .__refcnt = ATOMIC_INIT(1), | |
170 | .__use = 1, | |
101367c2 TG |
171 | .obsolete = -1, |
172 | .error = -EINVAL, | |
173 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
174 | .input = dst_discard, |
175 | .output = dst_discard, | |
101367c2 TG |
176 | } |
177 | }, | |
178 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
179 | .rt6i_metric = ~(u32) 0, | |
180 | .rt6i_ref = ATOMIC_INIT(1), | |
181 | }; | |
182 | ||
183 | #endif | |
184 | ||
1da177e4 | 185 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 186 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 187 | { |
f2fc6a54 | 188 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
189 | } |
190 | ||
191 | static void ip6_dst_destroy(struct dst_entry *dst) | |
192 | { | |
193 | struct rt6_info *rt = (struct rt6_info *)dst; | |
194 | struct inet6_dev *idev = rt->rt6i_idev; | |
195 | ||
196 | if (idev != NULL) { | |
197 | rt->rt6i_idev = NULL; | |
198 | in6_dev_put(idev); | |
1ab1457c | 199 | } |
1da177e4 LT |
200 | } |
201 | ||
202 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
203 | int how) | |
204 | { | |
205 | struct rt6_info *rt = (struct rt6_info *)dst; | |
206 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 207 | struct net_device *loopback_dev = |
c346dca1 | 208 | dev_net(dev)->loopback_dev; |
1da177e4 | 209 | |
5a3e55d6 DL |
210 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
211 | struct inet6_dev *loopback_idev = | |
212 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
213 | if (loopback_idev != NULL) { |
214 | rt->rt6i_idev = loopback_idev; | |
215 | in6_dev_put(idev); | |
216 | } | |
217 | } | |
218 | } | |
219 | ||
220 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
221 | { | |
222 | return (rt->rt6i_flags & RTF_EXPIRES && | |
223 | time_after(jiffies, rt->rt6i_expires)); | |
224 | } | |
225 | ||
c71099ac TG |
226 | static inline int rt6_need_strict(struct in6_addr *daddr) |
227 | { | |
228 | return (ipv6_addr_type(daddr) & | |
5ce83afa | 229 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)); |
c71099ac TG |
230 | } |
231 | ||
1da177e4 | 232 | /* |
c71099ac | 233 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
234 | */ |
235 | ||
8ed67789 DL |
236 | static inline struct rt6_info *rt6_device_match(struct net *net, |
237 | struct rt6_info *rt, | |
dd3abc4e | 238 | struct in6_addr *saddr, |
1da177e4 | 239 | int oif, |
d420895e | 240 | int flags) |
1da177e4 LT |
241 | { |
242 | struct rt6_info *local = NULL; | |
243 | struct rt6_info *sprt; | |
244 | ||
dd3abc4e YH |
245 | if (!oif && ipv6_addr_any(saddr)) |
246 | goto out; | |
247 | ||
248 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { | |
249 | struct net_device *dev = sprt->rt6i_dev; | |
250 | ||
251 | if (oif) { | |
1da177e4 LT |
252 | if (dev->ifindex == oif) |
253 | return sprt; | |
254 | if (dev->flags & IFF_LOOPBACK) { | |
255 | if (sprt->rt6i_idev == NULL || | |
256 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 257 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 258 | continue; |
1ab1457c | 259 | if (local && (!oif || |
1da177e4 LT |
260 | local->rt6i_idev->dev->ifindex == oif)) |
261 | continue; | |
262 | } | |
263 | local = sprt; | |
264 | } | |
dd3abc4e YH |
265 | } else { |
266 | if (ipv6_chk_addr(net, saddr, dev, | |
267 | flags & RT6_LOOKUP_F_IFACE)) | |
268 | return sprt; | |
1da177e4 | 269 | } |
dd3abc4e | 270 | } |
1da177e4 | 271 | |
dd3abc4e | 272 | if (oif) { |
1da177e4 LT |
273 | if (local) |
274 | return local; | |
275 | ||
d420895e | 276 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 277 | return net->ipv6.ip6_null_entry; |
1da177e4 | 278 | } |
dd3abc4e | 279 | out: |
1da177e4 LT |
280 | return rt; |
281 | } | |
282 | ||
27097255 YH |
283 | #ifdef CONFIG_IPV6_ROUTER_PREF |
284 | static void rt6_probe(struct rt6_info *rt) | |
285 | { | |
286 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
287 | /* | |
288 | * Okay, this does not seem to be appropriate | |
289 | * for now, however, we need to check if it | |
290 | * is really so; aka Router Reachability Probing. | |
291 | * | |
292 | * Router Reachability Probe MUST be rate-limited | |
293 | * to no more than one per minute. | |
294 | */ | |
295 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
296 | return; | |
297 | read_lock_bh(&neigh->lock); | |
298 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 299 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
300 | struct in6_addr mcaddr; |
301 | struct in6_addr *target; | |
302 | ||
303 | neigh->updated = jiffies; | |
304 | read_unlock_bh(&neigh->lock); | |
305 | ||
306 | target = (struct in6_addr *)&neigh->primary_key; | |
307 | addrconf_addr_solict_mult(target, &mcaddr); | |
308 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
309 | } else | |
310 | read_unlock_bh(&neigh->lock); | |
311 | } | |
312 | #else | |
313 | static inline void rt6_probe(struct rt6_info *rt) | |
314 | { | |
315 | return; | |
316 | } | |
317 | #endif | |
318 | ||
1da177e4 | 319 | /* |
554cfb7e | 320 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 321 | */ |
b6f99a21 | 322 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
323 | { |
324 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 325 | if (!oif || dev->ifindex == oif) |
554cfb7e | 326 | return 2; |
161980f4 DM |
327 | if ((dev->flags & IFF_LOOPBACK) && |
328 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
329 | return 1; | |
330 | return 0; | |
554cfb7e | 331 | } |
1da177e4 | 332 | |
b6f99a21 | 333 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 334 | { |
554cfb7e | 335 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 336 | int m; |
4d0c5911 YH |
337 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
338 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
339 | m = 1; | |
340 | else if (neigh) { | |
554cfb7e YH |
341 | read_lock_bh(&neigh->lock); |
342 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 343 | m = 2; |
398bcbeb YH |
344 | #ifdef CONFIG_IPV6_ROUTER_PREF |
345 | else if (neigh->nud_state & NUD_FAILED) | |
346 | m = 0; | |
347 | #endif | |
348 | else | |
ea73ee23 | 349 | m = 1; |
554cfb7e | 350 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
351 | } else |
352 | m = 0; | |
554cfb7e | 353 | return m; |
1da177e4 LT |
354 | } |
355 | ||
554cfb7e YH |
356 | static int rt6_score_route(struct rt6_info *rt, int oif, |
357 | int strict) | |
1da177e4 | 358 | { |
4d0c5911 | 359 | int m, n; |
1ab1457c | 360 | |
4d0c5911 | 361 | m = rt6_check_dev(rt, oif); |
77d16f45 | 362 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 363 | return -1; |
ebacaaa0 YH |
364 | #ifdef CONFIG_IPV6_ROUTER_PREF |
365 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
366 | #endif | |
4d0c5911 | 367 | n = rt6_check_neigh(rt); |
557e92ef | 368 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
369 | return -1; |
370 | return m; | |
371 | } | |
372 | ||
f11e6659 DM |
373 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
374 | int *mpri, struct rt6_info *match) | |
554cfb7e | 375 | { |
f11e6659 DM |
376 | int m; |
377 | ||
378 | if (rt6_check_expired(rt)) | |
379 | goto out; | |
380 | ||
381 | m = rt6_score_route(rt, oif, strict); | |
382 | if (m < 0) | |
383 | goto out; | |
384 | ||
385 | if (m > *mpri) { | |
386 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
387 | rt6_probe(match); | |
388 | *mpri = m; | |
389 | match = rt; | |
390 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
391 | rt6_probe(rt); | |
392 | } | |
393 | ||
394 | out: | |
395 | return match; | |
396 | } | |
397 | ||
398 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
399 | struct rt6_info *rr_head, | |
400 | u32 metric, int oif, int strict) | |
401 | { | |
402 | struct rt6_info *rt, *match; | |
554cfb7e | 403 | int mpri = -1; |
1da177e4 | 404 | |
f11e6659 DM |
405 | match = NULL; |
406 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
407 | rt = rt->u.dst.rt6_next) | |
408 | match = find_match(rt, oif, strict, &mpri, match); | |
409 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
410 | rt = rt->u.dst.rt6_next) | |
411 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 412 | |
f11e6659 DM |
413 | return match; |
414 | } | |
1da177e4 | 415 | |
f11e6659 DM |
416 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
417 | { | |
418 | struct rt6_info *match, *rt0; | |
8ed67789 | 419 | struct net *net; |
1da177e4 | 420 | |
f11e6659 | 421 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 422 | __func__, fn->leaf, oif); |
554cfb7e | 423 | |
f11e6659 DM |
424 | rt0 = fn->rr_ptr; |
425 | if (!rt0) | |
426 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 427 | |
f11e6659 | 428 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 429 | |
554cfb7e | 430 | if (!match && |
f11e6659 DM |
431 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
432 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
433 | ||
554cfb7e | 434 | /* no entries matched; do round-robin */ |
f11e6659 DM |
435 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
436 | next = fn->leaf; | |
437 | ||
438 | if (next != rt0) | |
439 | fn->rr_ptr = next; | |
1da177e4 | 440 | } |
1da177e4 | 441 | |
f11e6659 | 442 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 443 | __func__, match); |
1da177e4 | 444 | |
c346dca1 | 445 | net = dev_net(rt0->rt6i_dev); |
8ed67789 | 446 | return (match ? match : net->ipv6.ip6_null_entry); |
1da177e4 LT |
447 | } |
448 | ||
70ceb4f5 YH |
449 | #ifdef CONFIG_IPV6_ROUTE_INFO |
450 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
451 | struct in6_addr *gwaddr) | |
452 | { | |
c346dca1 | 453 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
454 | struct route_info *rinfo = (struct route_info *) opt; |
455 | struct in6_addr prefix_buf, *prefix; | |
456 | unsigned int pref; | |
4bed72e4 | 457 | unsigned long lifetime; |
70ceb4f5 YH |
458 | struct rt6_info *rt; |
459 | ||
460 | if (len < sizeof(struct route_info)) { | |
461 | return -EINVAL; | |
462 | } | |
463 | ||
464 | /* Sanity check for prefix_len and length */ | |
465 | if (rinfo->length > 3) { | |
466 | return -EINVAL; | |
467 | } else if (rinfo->prefix_len > 128) { | |
468 | return -EINVAL; | |
469 | } else if (rinfo->prefix_len > 64) { | |
470 | if (rinfo->length < 2) { | |
471 | return -EINVAL; | |
472 | } | |
473 | } else if (rinfo->prefix_len > 0) { | |
474 | if (rinfo->length < 1) { | |
475 | return -EINVAL; | |
476 | } | |
477 | } | |
478 | ||
479 | pref = rinfo->route_pref; | |
480 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
481 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
482 | ||
4bed72e4 | 483 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
484 | |
485 | if (rinfo->length == 3) | |
486 | prefix = (struct in6_addr *)rinfo->prefix; | |
487 | else { | |
488 | /* this function is safe */ | |
489 | ipv6_addr_prefix(&prefix_buf, | |
490 | (struct in6_addr *)rinfo->prefix, | |
491 | rinfo->prefix_len); | |
492 | prefix = &prefix_buf; | |
493 | } | |
494 | ||
efa2cea0 DL |
495 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
496 | dev->ifindex); | |
70ceb4f5 YH |
497 | |
498 | if (rt && !lifetime) { | |
e0a1ad73 | 499 | ip6_del_rt(rt); |
70ceb4f5 YH |
500 | rt = NULL; |
501 | } | |
502 | ||
503 | if (!rt && lifetime) | |
efa2cea0 | 504 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
505 | pref); |
506 | else if (rt) | |
507 | rt->rt6i_flags = RTF_ROUTEINFO | | |
508 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
509 | ||
510 | if (rt) { | |
4bed72e4 | 511 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
512 | rt->rt6i_flags &= ~RTF_EXPIRES; |
513 | } else { | |
514 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
515 | rt->rt6i_flags |= RTF_EXPIRES; | |
516 | } | |
517 | dst_release(&rt->u.dst); | |
518 | } | |
519 | return 0; | |
520 | } | |
521 | #endif | |
522 | ||
8ed67789 | 523 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 524 | do { \ |
8ed67789 | 525 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 526 | struct fib6_node *pn; \ |
e0eda7bb | 527 | while (1) { \ |
982f56f3 YH |
528 | if (fn->fn_flags & RTN_TL_ROOT) \ |
529 | goto out; \ | |
530 | pn = fn->parent; \ | |
531 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 532 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
533 | else \ |
534 | fn = pn; \ | |
535 | if (fn->fn_flags & RTN_RTINFO) \ | |
536 | goto restart; \ | |
c71099ac | 537 | } \ |
c71099ac | 538 | } \ |
982f56f3 | 539 | } while(0) |
c71099ac | 540 | |
8ed67789 DL |
541 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
542 | struct fib6_table *table, | |
c71099ac | 543 | struct flowi *fl, int flags) |
1da177e4 LT |
544 | { |
545 | struct fib6_node *fn; | |
546 | struct rt6_info *rt; | |
547 | ||
c71099ac TG |
548 | read_lock_bh(&table->tb6_lock); |
549 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
550 | restart: | |
551 | rt = fn->leaf; | |
dd3abc4e | 552 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 553 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 554 | out: |
03f49f34 | 555 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 556 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
557 | return rt; |
558 | ||
559 | } | |
560 | ||
9acd9f3a YH |
561 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
562 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
563 | { |
564 | struct flowi fl = { | |
565 | .oif = oif, | |
566 | .nl_u = { | |
567 | .ip6_u = { | |
568 | .daddr = *daddr, | |
c71099ac TG |
569 | }, |
570 | }, | |
571 | }; | |
572 | struct dst_entry *dst; | |
77d16f45 | 573 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 574 | |
adaa70bb TG |
575 | if (saddr) { |
576 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
577 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
578 | } | |
579 | ||
606a2b48 | 580 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
581 | if (dst->error == 0) |
582 | return (struct rt6_info *) dst; | |
583 | ||
584 | dst_release(dst); | |
585 | ||
1da177e4 LT |
586 | return NULL; |
587 | } | |
588 | ||
7159039a YH |
589 | EXPORT_SYMBOL(rt6_lookup); |
590 | ||
c71099ac | 591 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
592 | It takes new route entry, the addition fails by any reason the |
593 | route is freed. In any case, if caller does not hold it, it may | |
594 | be destroyed. | |
595 | */ | |
596 | ||
86872cb5 | 597 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
598 | { |
599 | int err; | |
c71099ac | 600 | struct fib6_table *table; |
1da177e4 | 601 | |
c71099ac TG |
602 | table = rt->rt6i_table; |
603 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 604 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 605 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
606 | |
607 | return err; | |
608 | } | |
609 | ||
40e22e8f TG |
610 | int ip6_ins_rt(struct rt6_info *rt) |
611 | { | |
4d1169c1 | 612 | struct nl_info info = { |
c346dca1 | 613 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 614 | }; |
528c4ceb | 615 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
616 | } |
617 | ||
95a9a5ba YH |
618 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
619 | struct in6_addr *saddr) | |
1da177e4 | 620 | { |
1da177e4 LT |
621 | struct rt6_info *rt; |
622 | ||
623 | /* | |
624 | * Clone the route. | |
625 | */ | |
626 | ||
627 | rt = ip6_rt_copy(ort); | |
628 | ||
629 | if (rt) { | |
14deae41 DM |
630 | struct neighbour *neigh; |
631 | int attempts = !in_softirq(); | |
632 | ||
58c4fb86 YH |
633 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
634 | if (rt->rt6i_dst.plen != 128 && | |
635 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
636 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 637 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 638 | } |
1da177e4 | 639 | |
58c4fb86 | 640 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
641 | rt->rt6i_dst.plen = 128; |
642 | rt->rt6i_flags |= RTF_CACHE; | |
643 | rt->u.dst.flags |= DST_HOST; | |
644 | ||
645 | #ifdef CONFIG_IPV6_SUBTREES | |
646 | if (rt->rt6i_src.plen && saddr) { | |
647 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
648 | rt->rt6i_src.plen = 128; | |
649 | } | |
650 | #endif | |
651 | ||
14deae41 DM |
652 | retry: |
653 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
654 | if (IS_ERR(neigh)) { | |
655 | struct net *net = dev_net(rt->rt6i_dev); | |
656 | int saved_rt_min_interval = | |
657 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
658 | int saved_rt_elasticity = | |
659 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
660 | ||
661 | if (attempts-- > 0) { | |
662 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
663 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
664 | ||
665 | ip6_dst_gc(net->ipv6.ip6_dst_ops); | |
666 | ||
667 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
668 | saved_rt_elasticity; | |
669 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
670 | saved_rt_min_interval; | |
671 | goto retry; | |
672 | } | |
673 | ||
674 | if (net_ratelimit()) | |
675 | printk(KERN_WARNING | |
676 | "Neighbour table overflow.\n"); | |
677 | dst_free(&rt->u.dst); | |
678 | return NULL; | |
679 | } | |
680 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 681 | |
95a9a5ba | 682 | } |
1da177e4 | 683 | |
95a9a5ba YH |
684 | return rt; |
685 | } | |
1da177e4 | 686 | |
299d9939 YH |
687 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
688 | { | |
689 | struct rt6_info *rt = ip6_rt_copy(ort); | |
690 | if (rt) { | |
691 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
692 | rt->rt6i_dst.plen = 128; | |
693 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
694 | rt->u.dst.flags |= DST_HOST; |
695 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
696 | } | |
697 | return rt; | |
698 | } | |
699 | ||
8ed67789 DL |
700 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
701 | struct flowi *fl, int flags) | |
1da177e4 LT |
702 | { |
703 | struct fib6_node *fn; | |
519fbd87 | 704 | struct rt6_info *rt, *nrt; |
c71099ac | 705 | int strict = 0; |
1da177e4 | 706 | int attempts = 3; |
519fbd87 | 707 | int err; |
53b7997f | 708 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 709 | |
77d16f45 | 710 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
711 | |
712 | relookup: | |
c71099ac | 713 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 714 | |
8238dd06 | 715 | restart_2: |
c71099ac | 716 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
717 | |
718 | restart: | |
4acad72d | 719 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
720 | |
721 | BACKTRACK(net, &fl->fl6_src); | |
722 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 723 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 724 | goto out; |
1da177e4 | 725 | |
fb9de91e | 726 | dst_hold(&rt->u.dst); |
c71099ac | 727 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 728 | |
519fbd87 | 729 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 730 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
731 | else { |
732 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 733 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
734 | #else |
735 | goto out2; | |
736 | #endif | |
737 | } | |
e40cf353 | 738 | |
519fbd87 | 739 | dst_release(&rt->u.dst); |
8ed67789 | 740 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 741 | |
519fbd87 YH |
742 | dst_hold(&rt->u.dst); |
743 | if (nrt) { | |
40e22e8f | 744 | err = ip6_ins_rt(nrt); |
519fbd87 | 745 | if (!err) |
1da177e4 | 746 | goto out2; |
1da177e4 | 747 | } |
1da177e4 | 748 | |
519fbd87 YH |
749 | if (--attempts <= 0) |
750 | goto out2; | |
751 | ||
752 | /* | |
c71099ac | 753 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
754 | * released someone could insert this route. Relookup. |
755 | */ | |
756 | dst_release(&rt->u.dst); | |
757 | goto relookup; | |
758 | ||
759 | out: | |
8238dd06 YH |
760 | if (reachable) { |
761 | reachable = 0; | |
762 | goto restart_2; | |
763 | } | |
519fbd87 | 764 | dst_hold(&rt->u.dst); |
c71099ac | 765 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
766 | out2: |
767 | rt->u.dst.lastuse = jiffies; | |
768 | rt->u.dst.__use++; | |
c71099ac TG |
769 | |
770 | return rt; | |
1da177e4 LT |
771 | } |
772 | ||
8ed67789 | 773 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
774 | struct flowi *fl, int flags) |
775 | { | |
8ed67789 | 776 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
777 | } |
778 | ||
c71099ac TG |
779 | void ip6_route_input(struct sk_buff *skb) |
780 | { | |
0660e03f | 781 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 782 | struct net *net = dev_net(skb->dev); |
adaa70bb | 783 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
784 | struct flowi fl = { |
785 | .iif = skb->dev->ifindex, | |
786 | .nl_u = { | |
787 | .ip6_u = { | |
788 | .daddr = iph->daddr, | |
789 | .saddr = iph->saddr, | |
90bcaf7b | 790 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
791 | }, |
792 | }, | |
1ab1457c | 793 | .mark = skb->mark, |
c71099ac TG |
794 | .proto = iph->nexthdr, |
795 | }; | |
adaa70bb | 796 | |
1d6e55f1 | 797 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 798 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 799 | |
5578689a | 800 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
801 | } |
802 | ||
8ed67789 | 803 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 804 | struct flowi *fl, int flags) |
1da177e4 | 805 | { |
8ed67789 | 806 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
807 | } |
808 | ||
4591db4f DL |
809 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
810 | struct flowi *fl) | |
c71099ac TG |
811 | { |
812 | int flags = 0; | |
813 | ||
814 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 815 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 816 | |
adaa70bb TG |
817 | if (!ipv6_addr_any(&fl->fl6_src)) |
818 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
7cbca67c YH |
819 | else if (sk) { |
820 | unsigned int prefs = inet6_sk(sk)->srcprefs; | |
821 | if (prefs & IPV6_PREFER_SRC_TMP) | |
822 | flags |= RT6_LOOKUP_F_SRCPREF_TMP; | |
823 | if (prefs & IPV6_PREFER_SRC_PUBLIC) | |
824 | flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC; | |
825 | if (prefs & IPV6_PREFER_SRC_COA) | |
826 | flags |= RT6_LOOKUP_F_SRCPREF_COA; | |
827 | } | |
adaa70bb | 828 | |
4591db4f | 829 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
830 | } |
831 | ||
7159039a | 832 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 833 | |
14e50e57 DM |
834 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
835 | { | |
836 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
837 | struct rt6_info *rt = (struct rt6_info *) | |
838 | dst_alloc(&ip6_dst_blackhole_ops); | |
839 | struct dst_entry *new = NULL; | |
840 | ||
841 | if (rt) { | |
842 | new = &rt->u.dst; | |
843 | ||
844 | atomic_set(&new->__refcnt, 1); | |
845 | new->__use = 1; | |
352e512c HX |
846 | new->input = dst_discard; |
847 | new->output = dst_discard; | |
14e50e57 DM |
848 | |
849 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
850 | new->dev = ort->u.dst.dev; | |
851 | if (new->dev) | |
852 | dev_hold(new->dev); | |
853 | rt->rt6i_idev = ort->rt6i_idev; | |
854 | if (rt->rt6i_idev) | |
855 | in6_dev_hold(rt->rt6i_idev); | |
856 | rt->rt6i_expires = 0; | |
857 | ||
858 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
859 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
860 | rt->rt6i_metric = 0; | |
861 | ||
862 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
863 | #ifdef CONFIG_IPV6_SUBTREES | |
864 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
865 | #endif | |
866 | ||
867 | dst_free(new); | |
868 | } | |
869 | ||
870 | dst_release(*dstp); | |
871 | *dstp = new; | |
872 | return (new ? 0 : -ENOMEM); | |
873 | } | |
874 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
875 | ||
1da177e4 LT |
876 | /* |
877 | * Destination cache support functions | |
878 | */ | |
879 | ||
880 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
881 | { | |
882 | struct rt6_info *rt; | |
883 | ||
884 | rt = (struct rt6_info *) dst; | |
885 | ||
886 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
887 | return dst; | |
888 | ||
889 | return NULL; | |
890 | } | |
891 | ||
892 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
893 | { | |
894 | struct rt6_info *rt = (struct rt6_info *) dst; | |
895 | ||
896 | if (rt) { | |
897 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 898 | ip6_del_rt(rt); |
1da177e4 LT |
899 | else |
900 | dst_release(dst); | |
901 | } | |
902 | return NULL; | |
903 | } | |
904 | ||
905 | static void ip6_link_failure(struct sk_buff *skb) | |
906 | { | |
907 | struct rt6_info *rt; | |
908 | ||
909 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
910 | ||
911 | rt = (struct rt6_info *) skb->dst; | |
912 | if (rt) { | |
913 | if (rt->rt6i_flags&RTF_CACHE) { | |
914 | dst_set_expires(&rt->u.dst, 0); | |
915 | rt->rt6i_flags |= RTF_EXPIRES; | |
916 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
917 | rt->rt6i_node->fn_sernum = -1; | |
918 | } | |
919 | } | |
920 | ||
921 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
922 | { | |
923 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
924 | ||
925 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
926 | rt6->rt6i_flags |= RTF_MODIFIED; | |
927 | if (mtu < IPV6_MIN_MTU) { | |
928 | mtu = IPV6_MIN_MTU; | |
929 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
930 | } | |
931 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 932 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
933 | } |
934 | } | |
935 | ||
1da177e4 LT |
936 | static int ipv6_get_mtu(struct net_device *dev); |
937 | ||
5578689a | 938 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
939 | { |
940 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
941 | ||
5578689a DL |
942 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
943 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
944 | |
945 | /* | |
1ab1457c YH |
946 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
947 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
948 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
949 | * rely only on pmtu discovery" |
950 | */ | |
951 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
952 | mtu = IPV6_MAXPLEN; | |
953 | return mtu; | |
954 | } | |
955 | ||
3b00944c YH |
956 | static struct dst_entry *icmp6_dst_gc_list; |
957 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 958 | |
3b00944c | 959 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 960 | struct neighbour *neigh, |
9acd9f3a | 961 | const struct in6_addr *addr) |
1da177e4 LT |
962 | { |
963 | struct rt6_info *rt; | |
964 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 965 | struct net *net = dev_net(dev); |
1da177e4 LT |
966 | |
967 | if (unlikely(idev == NULL)) | |
968 | return NULL; | |
969 | ||
f2fc6a54 | 970 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
971 | if (unlikely(rt == NULL)) { |
972 | in6_dev_put(idev); | |
973 | goto out; | |
974 | } | |
975 | ||
976 | dev_hold(dev); | |
977 | if (neigh) | |
978 | neigh_hold(neigh); | |
14deae41 | 979 | else { |
1da177e4 | 980 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
981 | if (IS_ERR(neigh)) |
982 | neigh = NULL; | |
983 | } | |
1da177e4 LT |
984 | |
985 | rt->rt6i_dev = dev; | |
986 | rt->rt6i_idev = idev; | |
987 | rt->rt6i_nexthop = neigh; | |
988 | atomic_set(&rt->u.dst.__refcnt, 1); | |
989 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
990 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 991 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 992 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
993 | |
994 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
995 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
996 | ? DST_HOST | |
1da177e4 LT |
997 | : 0; |
998 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
999 | rt->rt6i_dst.plen = 128; | |
1000 | #endif | |
1001 | ||
3b00944c YH |
1002 | spin_lock_bh(&icmp6_dst_lock); |
1003 | rt->u.dst.next = icmp6_dst_gc_list; | |
1004 | icmp6_dst_gc_list = &rt->u.dst; | |
1005 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 1006 | |
5578689a | 1007 | fib6_force_start_gc(net); |
1da177e4 LT |
1008 | |
1009 | out: | |
40aa7b90 | 1010 | return &rt->u.dst; |
1da177e4 LT |
1011 | } |
1012 | ||
3d0f24a7 | 1013 | int icmp6_dst_gc(void) |
1da177e4 LT |
1014 | { |
1015 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 1016 | int more = 0; |
1da177e4 LT |
1017 | |
1018 | next = NULL; | |
5d0bbeeb | 1019 | |
3b00944c YH |
1020 | spin_lock_bh(&icmp6_dst_lock); |
1021 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1022 | |
1da177e4 LT |
1023 | while ((dst = *pprev) != NULL) { |
1024 | if (!atomic_read(&dst->__refcnt)) { | |
1025 | *pprev = dst->next; | |
1026 | dst_free(dst); | |
1da177e4 LT |
1027 | } else { |
1028 | pprev = &dst->next; | |
3d0f24a7 | 1029 | ++more; |
1da177e4 LT |
1030 | } |
1031 | } | |
1032 | ||
3b00944c | 1033 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1034 | |
3d0f24a7 | 1035 | return more; |
1da177e4 LT |
1036 | } |
1037 | ||
1e493d19 DM |
1038 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1039 | void *arg) | |
1040 | { | |
1041 | struct dst_entry *dst, **pprev; | |
1042 | ||
1043 | spin_lock_bh(&icmp6_dst_lock); | |
1044 | pprev = &icmp6_dst_gc_list; | |
1045 | while ((dst = *pprev) != NULL) { | |
1046 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1047 | if (func(rt, arg)) { | |
1048 | *pprev = dst->next; | |
1049 | dst_free(dst); | |
1050 | } else { | |
1051 | pprev = &dst->next; | |
1052 | } | |
1053 | } | |
1054 | spin_unlock_bh(&icmp6_dst_lock); | |
1055 | } | |
1056 | ||
569d3645 | 1057 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1058 | { |
1da177e4 | 1059 | unsigned long now = jiffies; |
7019b78e DL |
1060 | struct net *net = ops->dst_net; |
1061 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
1062 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1063 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1064 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1065 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1066 | ||
1067 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1068 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1069 | goto out; |
1070 | ||
6891a346 BT |
1071 | net->ipv6.ip6_rt_gc_expire++; |
1072 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1073 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1074 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1075 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1076 | out: |
7019b78e DL |
1077 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1078 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1082 | but results in cleaner routing tables. | |
1083 | ||
1084 | Remove it only when all the things will work! | |
1085 | */ | |
1086 | ||
1087 | static int ipv6_get_mtu(struct net_device *dev) | |
1088 | { | |
1089 | int mtu = IPV6_MIN_MTU; | |
1090 | struct inet6_dev *idev; | |
1091 | ||
1092 | idev = in6_dev_get(dev); | |
1093 | if (idev) { | |
1094 | mtu = idev->cnf.mtu6; | |
1095 | in6_dev_put(idev); | |
1096 | } | |
1097 | return mtu; | |
1098 | } | |
1099 | ||
6b75d090 | 1100 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1101 | { |
6b75d090 YH |
1102 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1103 | if (hoplimit < 0) { | |
1104 | struct net_device *dev = dst->dev; | |
1105 | struct inet6_dev *idev = in6_dev_get(dev); | |
1106 | if (idev) { | |
1107 | hoplimit = idev->cnf.hop_limit; | |
1108 | in6_dev_put(idev); | |
1109 | } else | |
53b7997f | 1110 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
1da177e4 LT |
1111 | } |
1112 | return hoplimit; | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * | |
1117 | */ | |
1118 | ||
86872cb5 | 1119 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1120 | { |
1121 | int err; | |
5578689a | 1122 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1123 | struct rt6_info *rt = NULL; |
1124 | struct net_device *dev = NULL; | |
1125 | struct inet6_dev *idev = NULL; | |
c71099ac | 1126 | struct fib6_table *table; |
1da177e4 LT |
1127 | int addr_type; |
1128 | ||
86872cb5 | 1129 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1130 | return -EINVAL; |
1131 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1132 | if (cfg->fc_src_len) |
1da177e4 LT |
1133 | return -EINVAL; |
1134 | #endif | |
86872cb5 | 1135 | if (cfg->fc_ifindex) { |
1da177e4 | 1136 | err = -ENODEV; |
5578689a | 1137 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1138 | if (!dev) |
1139 | goto out; | |
1140 | idev = in6_dev_get(dev); | |
1141 | if (!idev) | |
1142 | goto out; | |
1143 | } | |
1144 | ||
86872cb5 TG |
1145 | if (cfg->fc_metric == 0) |
1146 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1147 | |
5578689a | 1148 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1149 | if (table == NULL) { |
1150 | err = -ENOBUFS; | |
1151 | goto out; | |
1152 | } | |
1153 | ||
f2fc6a54 | 1154 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1155 | |
1156 | if (rt == NULL) { | |
1157 | err = -ENOMEM; | |
1158 | goto out; | |
1159 | } | |
1160 | ||
1161 | rt->u.dst.obsolete = -1; | |
6f704992 YH |
1162 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1163 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1164 | 0; | |
1da177e4 | 1165 | |
86872cb5 TG |
1166 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1167 | cfg->fc_protocol = RTPROT_BOOT; | |
1168 | rt->rt6i_protocol = cfg->fc_protocol; | |
1169 | ||
1170 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1171 | |
1172 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1173 | rt->u.dst.input = ip6_mc_input; | |
1174 | else | |
1175 | rt->u.dst.input = ip6_forward; | |
1176 | ||
1177 | rt->u.dst.output = ip6_output; | |
1178 | ||
86872cb5 TG |
1179 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1180 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1181 | if (rt->rt6i_dst.plen == 128) |
1182 | rt->u.dst.flags = DST_HOST; | |
1183 | ||
1184 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1185 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1186 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1187 | #endif |
1188 | ||
86872cb5 | 1189 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1190 | |
1191 | /* We cannot add true routes via loopback here, | |
1192 | they would result in kernel looping; promote them to reject routes | |
1193 | */ | |
86872cb5 | 1194 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1195 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1196 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1197 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1198 | if (dev) { |
1199 | dev_put(dev); | |
1200 | in6_dev_put(idev); | |
1201 | } | |
5578689a | 1202 | dev = net->loopback_dev; |
1da177e4 LT |
1203 | dev_hold(dev); |
1204 | idev = in6_dev_get(dev); | |
1205 | if (!idev) { | |
1206 | err = -ENODEV; | |
1207 | goto out; | |
1208 | } | |
1209 | } | |
1210 | rt->u.dst.output = ip6_pkt_discard_out; | |
1211 | rt->u.dst.input = ip6_pkt_discard; | |
1212 | rt->u.dst.error = -ENETUNREACH; | |
1213 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1214 | goto install_route; | |
1215 | } | |
1216 | ||
86872cb5 | 1217 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1218 | struct in6_addr *gw_addr; |
1219 | int gwa_type; | |
1220 | ||
86872cb5 TG |
1221 | gw_addr = &cfg->fc_gateway; |
1222 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1223 | gwa_type = ipv6_addr_type(gw_addr); |
1224 | ||
1225 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1226 | struct rt6_info *grt; | |
1227 | ||
1228 | /* IPv6 strictly inhibits using not link-local | |
1229 | addresses as nexthop address. | |
1230 | Otherwise, router will not able to send redirects. | |
1231 | It is very good, but in some (rare!) circumstances | |
1232 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1233 | some exceptions. --ANK | |
1234 | */ | |
1235 | err = -EINVAL; | |
1236 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1237 | goto out; | |
1238 | ||
5578689a | 1239 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1240 | |
1241 | err = -EHOSTUNREACH; | |
1242 | if (grt == NULL) | |
1243 | goto out; | |
1244 | if (dev) { | |
1245 | if (dev != grt->rt6i_dev) { | |
1246 | dst_release(&grt->u.dst); | |
1247 | goto out; | |
1248 | } | |
1249 | } else { | |
1250 | dev = grt->rt6i_dev; | |
1251 | idev = grt->rt6i_idev; | |
1252 | dev_hold(dev); | |
1253 | in6_dev_hold(grt->rt6i_idev); | |
1254 | } | |
1255 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1256 | err = 0; | |
1257 | dst_release(&grt->u.dst); | |
1258 | ||
1259 | if (err) | |
1260 | goto out; | |
1261 | } | |
1262 | err = -EINVAL; | |
1263 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1264 | goto out; | |
1265 | } | |
1266 | ||
1267 | err = -ENODEV; | |
1268 | if (dev == NULL) | |
1269 | goto out; | |
1270 | ||
86872cb5 | 1271 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1272 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1273 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1274 | err = PTR_ERR(rt->rt6i_nexthop); | |
1275 | rt->rt6i_nexthop = NULL; | |
1276 | goto out; | |
1277 | } | |
1278 | } | |
1279 | ||
86872cb5 | 1280 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1281 | |
1282 | install_route: | |
86872cb5 TG |
1283 | if (cfg->fc_mx) { |
1284 | struct nlattr *nla; | |
1285 | int remaining; | |
1286 | ||
1287 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1288 | int type = nla_type(nla); |
86872cb5 TG |
1289 | |
1290 | if (type) { | |
1291 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1292 | err = -EINVAL; |
1293 | goto out; | |
1294 | } | |
86872cb5 TG |
1295 | |
1296 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1297 | } |
1da177e4 LT |
1298 | } |
1299 | } | |
1300 | ||
5ffc02a1 | 1301 | if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0) |
1da177e4 | 1302 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1ca615fb | 1303 | if (!dst_mtu(&rt->u.dst)) |
1da177e4 | 1304 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
5ffc02a1 | 1305 | if (!dst_metric(&rt->u.dst, RTAX_ADVMSS)) |
5578689a | 1306 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1307 | rt->u.dst.dev = dev; |
1308 | rt->rt6i_idev = idev; | |
c71099ac | 1309 | rt->rt6i_table = table; |
63152fc0 | 1310 | |
c346dca1 | 1311 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1312 | |
86872cb5 | 1313 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1314 | |
1315 | out: | |
1316 | if (dev) | |
1317 | dev_put(dev); | |
1318 | if (idev) | |
1319 | in6_dev_put(idev); | |
1320 | if (rt) | |
40aa7b90 | 1321 | dst_free(&rt->u.dst); |
1da177e4 LT |
1322 | return err; |
1323 | } | |
1324 | ||
86872cb5 | 1325 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1326 | { |
1327 | int err; | |
c71099ac | 1328 | struct fib6_table *table; |
c346dca1 | 1329 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1330 | |
8ed67789 | 1331 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1332 | return -ENOENT; |
1333 | ||
c71099ac TG |
1334 | table = rt->rt6i_table; |
1335 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1336 | |
86872cb5 | 1337 | err = fib6_del(rt, info); |
1da177e4 LT |
1338 | dst_release(&rt->u.dst); |
1339 | ||
c71099ac | 1340 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1341 | |
1342 | return err; | |
1343 | } | |
1344 | ||
e0a1ad73 TG |
1345 | int ip6_del_rt(struct rt6_info *rt) |
1346 | { | |
4d1169c1 | 1347 | struct nl_info info = { |
c346dca1 | 1348 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1349 | }; |
528c4ceb | 1350 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1351 | } |
1352 | ||
86872cb5 | 1353 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1354 | { |
c71099ac | 1355 | struct fib6_table *table; |
1da177e4 LT |
1356 | struct fib6_node *fn; |
1357 | struct rt6_info *rt; | |
1358 | int err = -ESRCH; | |
1359 | ||
5578689a | 1360 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1361 | if (table == NULL) |
1362 | return err; | |
1363 | ||
1364 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1365 | |
c71099ac | 1366 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1367 | &cfg->fc_dst, cfg->fc_dst_len, |
1368 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1369 | |
1da177e4 | 1370 | if (fn) { |
7cc48263 | 1371 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1372 | if (cfg->fc_ifindex && |
1da177e4 | 1373 | (rt->rt6i_dev == NULL || |
86872cb5 | 1374 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1375 | continue; |
86872cb5 TG |
1376 | if (cfg->fc_flags & RTF_GATEWAY && |
1377 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1378 | continue; |
86872cb5 | 1379 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1380 | continue; |
1381 | dst_hold(&rt->u.dst); | |
c71099ac | 1382 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1383 | |
86872cb5 | 1384 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1385 | } |
1386 | } | |
c71099ac | 1387 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1388 | |
1389 | return err; | |
1390 | } | |
1391 | ||
1392 | /* | |
1393 | * Handle redirects | |
1394 | */ | |
a6279458 YH |
1395 | struct ip6rd_flowi { |
1396 | struct flowi fl; | |
1397 | struct in6_addr gateway; | |
1398 | }; | |
1399 | ||
8ed67789 DL |
1400 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1401 | struct fib6_table *table, | |
a6279458 YH |
1402 | struct flowi *fl, |
1403 | int flags) | |
1da177e4 | 1404 | { |
a6279458 YH |
1405 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1406 | struct rt6_info *rt; | |
e843b9e1 | 1407 | struct fib6_node *fn; |
c71099ac | 1408 | |
1da177e4 | 1409 | /* |
e843b9e1 YH |
1410 | * Get the "current" route for this destination and |
1411 | * check if the redirect has come from approriate router. | |
1412 | * | |
1413 | * RFC 2461 specifies that redirects should only be | |
1414 | * accepted if they come from the nexthop to the target. | |
1415 | * Due to the way the routes are chosen, this notion | |
1416 | * is a bit fuzzy and one might need to check all possible | |
1417 | * routes. | |
1da177e4 | 1418 | */ |
1da177e4 | 1419 | |
c71099ac | 1420 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1421 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1422 | restart: |
7cc48263 | 1423 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1424 | /* |
1425 | * Current route is on-link; redirect is always invalid. | |
1426 | * | |
1427 | * Seems, previous statement is not true. It could | |
1428 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1429 | * But then router serving it might decide, that we should | |
1430 | * know truth 8)8) --ANK (980726). | |
1431 | */ | |
1432 | if (rt6_check_expired(rt)) | |
1433 | continue; | |
1434 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1435 | continue; | |
a6279458 | 1436 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1437 | continue; |
a6279458 | 1438 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1439 | continue; |
1440 | break; | |
1441 | } | |
a6279458 | 1442 | |
cb15d9c2 | 1443 | if (!rt) |
8ed67789 DL |
1444 | rt = net->ipv6.ip6_null_entry; |
1445 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1446 | out: |
a6279458 YH |
1447 | dst_hold(&rt->u.dst); |
1448 | ||
c71099ac | 1449 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1450 | |
a6279458 YH |
1451 | return rt; |
1452 | }; | |
1453 | ||
1454 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1455 | struct in6_addr *src, | |
1456 | struct in6_addr *gateway, | |
1457 | struct net_device *dev) | |
1458 | { | |
adaa70bb | 1459 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1460 | struct net *net = dev_net(dev); |
a6279458 YH |
1461 | struct ip6rd_flowi rdfl = { |
1462 | .fl = { | |
1463 | .oif = dev->ifindex, | |
1464 | .nl_u = { | |
1465 | .ip6_u = { | |
1466 | .daddr = *dest, | |
1467 | .saddr = *src, | |
1468 | }, | |
1469 | }, | |
1470 | }, | |
1471 | .gateway = *gateway, | |
1472 | }; | |
adaa70bb TG |
1473 | |
1474 | if (rt6_need_strict(dest)) | |
1475 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1476 | |
5578689a | 1477 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1478 | flags, __ip6_route_redirect); |
a6279458 YH |
1479 | } |
1480 | ||
1481 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1482 | struct in6_addr *saddr, | |
1483 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1484 | { | |
1485 | struct rt6_info *rt, *nrt = NULL; | |
1486 | struct netevent_redirect netevent; | |
c346dca1 | 1487 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1488 | |
1489 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1490 | ||
8ed67789 | 1491 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1492 | if (net_ratelimit()) |
1493 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1494 | "for redirect target\n"); | |
a6279458 | 1495 | goto out; |
1da177e4 LT |
1496 | } |
1497 | ||
1da177e4 LT |
1498 | /* |
1499 | * We have finally decided to accept it. | |
1500 | */ | |
1501 | ||
1ab1457c | 1502 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1503 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1504 | NEIGH_UPDATE_F_OVERRIDE| | |
1505 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1506 | NEIGH_UPDATE_F_ISROUTER)) | |
1507 | ); | |
1508 | ||
1509 | /* | |
1510 | * Redirect received -> path was valid. | |
1511 | * Look, redirects are sent only in response to data packets, | |
1512 | * so that this nexthop apparently is reachable. --ANK | |
1513 | */ | |
1514 | dst_confirm(&rt->u.dst); | |
1515 | ||
1516 | /* Duplicate redirect: silently ignore. */ | |
1517 | if (neigh == rt->u.dst.neighbour) | |
1518 | goto out; | |
1519 | ||
1520 | nrt = ip6_rt_copy(rt); | |
1521 | if (nrt == NULL) | |
1522 | goto out; | |
1523 | ||
1524 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1525 | if (on_link) | |
1526 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1527 | ||
1528 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1529 | nrt->rt6i_dst.plen = 128; | |
1530 | nrt->u.dst.flags |= DST_HOST; | |
1531 | ||
1532 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1533 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1534 | /* Reset pmtu, it may be better */ | |
1535 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
c346dca1 | 1536 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev), |
5578689a | 1537 | dst_mtu(&nrt->u.dst)); |
1da177e4 | 1538 | |
40e22e8f | 1539 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1540 | goto out; |
1541 | ||
8d71740c TT |
1542 | netevent.old = &rt->u.dst; |
1543 | netevent.new = &nrt->u.dst; | |
1544 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1545 | ||
1da177e4 | 1546 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1547 | ip6_del_rt(rt); |
1da177e4 LT |
1548 | return; |
1549 | } | |
1550 | ||
1551 | out: | |
1ab1457c | 1552 | dst_release(&rt->u.dst); |
1da177e4 LT |
1553 | return; |
1554 | } | |
1555 | ||
1556 | /* | |
1557 | * Handle ICMP "packet too big" messages | |
1558 | * i.e. Path MTU discovery | |
1559 | */ | |
1560 | ||
1561 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1562 | struct net_device *dev, u32 pmtu) | |
1563 | { | |
1564 | struct rt6_info *rt, *nrt; | |
c346dca1 | 1565 | struct net *net = dev_net(dev); |
1da177e4 LT |
1566 | int allfrag = 0; |
1567 | ||
5578689a | 1568 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1569 | if (rt == NULL) |
1570 | return; | |
1571 | ||
1572 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1573 | goto out; | |
1574 | ||
1575 | if (pmtu < IPV6_MIN_MTU) { | |
1576 | /* | |
1ab1457c | 1577 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1578 | * MTU (1280) and a fragment header should always be included |
1579 | * after a node receiving Too Big message reporting PMTU is | |
1580 | * less than the IPv6 Minimum Link MTU. | |
1581 | */ | |
1582 | pmtu = IPV6_MIN_MTU; | |
1583 | allfrag = 1; | |
1584 | } | |
1585 | ||
1586 | /* New mtu received -> path was valid. | |
1587 | They are sent only in response to data packets, | |
1588 | so that this nexthop apparently is reachable. --ANK | |
1589 | */ | |
1590 | dst_confirm(&rt->u.dst); | |
1591 | ||
1592 | /* Host route. If it is static, it would be better | |
1593 | not to override it, but add new one, so that | |
1594 | when cache entry will expire old pmtu | |
1595 | would return automatically. | |
1596 | */ | |
1597 | if (rt->rt6i_flags & RTF_CACHE) { | |
1598 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1599 | if (allfrag) | |
1600 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1601 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1602 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1603 | goto out; | |
1604 | } | |
1605 | ||
1606 | /* Network route. | |
1607 | Two cases are possible: | |
1608 | 1. It is connected route. Action: COW | |
1609 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1610 | */ | |
d5315b50 | 1611 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1612 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1613 | else |
1614 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1615 | |
d5315b50 | 1616 | if (nrt) { |
a1e78363 YH |
1617 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1618 | if (allfrag) | |
1619 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1620 | ||
1621 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1622 | * happened within 5 mins, the recommended timer is 10 mins. | |
1623 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1624 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1625 | * and detecting PMTU increase will be automatically happened. | |
1626 | */ | |
5578689a | 1627 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1628 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1629 | ||
40e22e8f | 1630 | ip6_ins_rt(nrt); |
1da177e4 | 1631 | } |
1da177e4 LT |
1632 | out: |
1633 | dst_release(&rt->u.dst); | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * Misc support functions | |
1638 | */ | |
1639 | ||
1640 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1641 | { | |
c346dca1 | 1642 | struct net *net = dev_net(ort->rt6i_dev); |
f2fc6a54 | 1643 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1644 | |
1645 | if (rt) { | |
1646 | rt->u.dst.input = ort->u.dst.input; | |
1647 | rt->u.dst.output = ort->u.dst.output; | |
1648 | ||
1649 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1650 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1651 | rt->u.dst.dev = ort->u.dst.dev; |
1652 | if (rt->u.dst.dev) | |
1653 | dev_hold(rt->u.dst.dev); | |
1654 | rt->rt6i_idev = ort->rt6i_idev; | |
1655 | if (rt->rt6i_idev) | |
1656 | in6_dev_hold(rt->rt6i_idev); | |
1657 | rt->u.dst.lastuse = jiffies; | |
1658 | rt->rt6i_expires = 0; | |
1659 | ||
1660 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1661 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1662 | rt->rt6i_metric = 0; | |
1663 | ||
1664 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1665 | #ifdef CONFIG_IPV6_SUBTREES | |
1666 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1667 | #endif | |
c71099ac | 1668 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1669 | } |
1670 | return rt; | |
1671 | } | |
1672 | ||
70ceb4f5 | 1673 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1674 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1675 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1676 | struct in6_addr *gwaddr, int ifindex) |
1677 | { | |
1678 | struct fib6_node *fn; | |
1679 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1680 | struct fib6_table *table; |
1681 | ||
efa2cea0 | 1682 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1683 | if (table == NULL) |
1684 | return NULL; | |
70ceb4f5 | 1685 | |
c71099ac TG |
1686 | write_lock_bh(&table->tb6_lock); |
1687 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1688 | if (!fn) |
1689 | goto out; | |
1690 | ||
7cc48263 | 1691 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1692 | if (rt->rt6i_dev->ifindex != ifindex) |
1693 | continue; | |
1694 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1695 | continue; | |
1696 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1697 | continue; | |
1698 | dst_hold(&rt->u.dst); | |
1699 | break; | |
1700 | } | |
1701 | out: | |
c71099ac | 1702 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1703 | return rt; |
1704 | } | |
1705 | ||
efa2cea0 DL |
1706 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1707 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1708 | struct in6_addr *gwaddr, int ifindex, |
1709 | unsigned pref) | |
1710 | { | |
86872cb5 TG |
1711 | struct fib6_config cfg = { |
1712 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1713 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1714 | .fc_ifindex = ifindex, |
1715 | .fc_dst_len = prefixlen, | |
1716 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1717 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1718 | .fc_nlinfo.pid = 0, |
1719 | .fc_nlinfo.nlh = NULL, | |
1720 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1721 | }; |
1722 | ||
1723 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1724 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1725 | |
e317da96 YH |
1726 | /* We should treat it as a default route if prefix length is 0. */ |
1727 | if (!prefixlen) | |
86872cb5 | 1728 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1729 | |
86872cb5 | 1730 | ip6_route_add(&cfg); |
70ceb4f5 | 1731 | |
efa2cea0 | 1732 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1733 | } |
1734 | #endif | |
1735 | ||
1da177e4 | 1736 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1737 | { |
1da177e4 | 1738 | struct rt6_info *rt; |
c71099ac | 1739 | struct fib6_table *table; |
1da177e4 | 1740 | |
c346dca1 | 1741 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1742 | if (table == NULL) |
1743 | return NULL; | |
1da177e4 | 1744 | |
c71099ac | 1745 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1746 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1747 | if (dev == rt->rt6i_dev && |
045927ff | 1748 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1749 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1750 | break; | |
1751 | } | |
1752 | if (rt) | |
1753 | dst_hold(&rt->u.dst); | |
c71099ac | 1754 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1755 | return rt; |
1756 | } | |
1757 | ||
1758 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1759 | struct net_device *dev, |
1760 | unsigned int pref) | |
1da177e4 | 1761 | { |
86872cb5 TG |
1762 | struct fib6_config cfg = { |
1763 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1764 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1765 | .fc_ifindex = dev->ifindex, |
1766 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1767 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1768 | .fc_nlinfo.pid = 0, |
1769 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1770 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1771 | }; |
1da177e4 | 1772 | |
86872cb5 | 1773 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1774 | |
86872cb5 | 1775 | ip6_route_add(&cfg); |
1da177e4 | 1776 | |
1da177e4 LT |
1777 | return rt6_get_dflt_router(gwaddr, dev); |
1778 | } | |
1779 | ||
7b4da532 | 1780 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1781 | { |
1782 | struct rt6_info *rt; | |
c71099ac TG |
1783 | struct fib6_table *table; |
1784 | ||
1785 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1786 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1787 | if (table == NULL) |
1788 | return; | |
1da177e4 LT |
1789 | |
1790 | restart: | |
c71099ac | 1791 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1792 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1793 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1794 | dst_hold(&rt->u.dst); | |
c71099ac | 1795 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1796 | ip6_del_rt(rt); |
1da177e4 LT |
1797 | goto restart; |
1798 | } | |
1799 | } | |
c71099ac | 1800 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1801 | } |
1802 | ||
5578689a DL |
1803 | static void rtmsg_to_fib6_config(struct net *net, |
1804 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1805 | struct fib6_config *cfg) |
1806 | { | |
1807 | memset(cfg, 0, sizeof(*cfg)); | |
1808 | ||
1809 | cfg->fc_table = RT6_TABLE_MAIN; | |
1810 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1811 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1812 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1813 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1814 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1815 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1816 | ||
5578689a | 1817 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1818 | |
86872cb5 TG |
1819 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1820 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1821 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1822 | } | |
1823 | ||
5578689a | 1824 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1825 | { |
86872cb5 | 1826 | struct fib6_config cfg; |
1da177e4 LT |
1827 | struct in6_rtmsg rtmsg; |
1828 | int err; | |
1829 | ||
1830 | switch(cmd) { | |
1831 | case SIOCADDRT: /* Add a route */ | |
1832 | case SIOCDELRT: /* Delete a route */ | |
1833 | if (!capable(CAP_NET_ADMIN)) | |
1834 | return -EPERM; | |
1835 | err = copy_from_user(&rtmsg, arg, | |
1836 | sizeof(struct in6_rtmsg)); | |
1837 | if (err) | |
1838 | return -EFAULT; | |
86872cb5 | 1839 | |
5578689a | 1840 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1841 | |
1da177e4 LT |
1842 | rtnl_lock(); |
1843 | switch (cmd) { | |
1844 | case SIOCADDRT: | |
86872cb5 | 1845 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1846 | break; |
1847 | case SIOCDELRT: | |
86872cb5 | 1848 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1849 | break; |
1850 | default: | |
1851 | err = -EINVAL; | |
1852 | } | |
1853 | rtnl_unlock(); | |
1854 | ||
1855 | return err; | |
3ff50b79 | 1856 | } |
1da177e4 LT |
1857 | |
1858 | return -EINVAL; | |
1859 | } | |
1860 | ||
1861 | /* | |
1862 | * Drop the packet on the floor | |
1863 | */ | |
1864 | ||
50eb431d | 1865 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1866 | { |
612f09e8 | 1867 | int type; |
3bd653c8 | 1868 | struct dst_entry *dst = skb->dst; |
612f09e8 YH |
1869 | switch (ipstats_mib_noroutes) { |
1870 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1871 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 | 1872 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
3bd653c8 DL |
1873 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1874 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1875 | break; |
1876 | } | |
1877 | /* FALLTHROUGH */ | |
1878 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1879 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1880 | ipstats_mib_noroutes); | |
612f09e8 YH |
1881 | break; |
1882 | } | |
9ce8ade0 | 1883 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1884 | kfree_skb(skb); |
1885 | return 0; | |
1886 | } | |
1887 | ||
9ce8ade0 TG |
1888 | static int ip6_pkt_discard(struct sk_buff *skb) |
1889 | { | |
612f09e8 | 1890 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1891 | } |
1892 | ||
20380731 | 1893 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1894 | { |
1895 | skb->dev = skb->dst->dev; | |
612f09e8 | 1896 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1897 | } |
1898 | ||
6723ab54 DM |
1899 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1900 | ||
9ce8ade0 TG |
1901 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1902 | { | |
612f09e8 | 1903 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1904 | } |
1905 | ||
1906 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1907 | { | |
1908 | skb->dev = skb->dst->dev; | |
612f09e8 | 1909 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1910 | } |
1911 | ||
6723ab54 DM |
1912 | #endif |
1913 | ||
1da177e4 LT |
1914 | /* |
1915 | * Allocate a dst for local (unicast / anycast) address. | |
1916 | */ | |
1917 | ||
1918 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1919 | const struct in6_addr *addr, | |
1920 | int anycast) | |
1921 | { | |
c346dca1 | 1922 | struct net *net = dev_net(idev->dev); |
f2fc6a54 | 1923 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
14deae41 | 1924 | struct neighbour *neigh; |
1da177e4 LT |
1925 | |
1926 | if (rt == NULL) | |
1927 | return ERR_PTR(-ENOMEM); | |
1928 | ||
5578689a | 1929 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1930 | in6_dev_hold(idev); |
1931 | ||
1932 | rt->u.dst.flags = DST_HOST; | |
1933 | rt->u.dst.input = ip6_input; | |
1934 | rt->u.dst.output = ip6_output; | |
5578689a | 1935 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1936 | rt->rt6i_idev = idev; |
1937 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1938 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1939 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1940 | rt->u.dst.obsolete = -1; | |
1941 | ||
1942 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1943 | if (anycast) |
1944 | rt->rt6i_flags |= RTF_ANYCAST; | |
1945 | else | |
1da177e4 | 1946 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
1947 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
1948 | if (IS_ERR(neigh)) { | |
40aa7b90 | 1949 | dst_free(&rt->u.dst); |
14deae41 DM |
1950 | |
1951 | /* We are casting this because that is the return | |
1952 | * value type. But an errno encoded pointer is the | |
1953 | * same regardless of the underlying pointer type, | |
1954 | * and that's what we are returning. So this is OK. | |
1955 | */ | |
1956 | return (struct rt6_info *) neigh; | |
1da177e4 | 1957 | } |
14deae41 | 1958 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
1959 | |
1960 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1961 | rt->rt6i_dst.plen = 128; | |
5578689a | 1962 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1963 | |
1964 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1965 | ||
1966 | return rt; | |
1967 | } | |
1968 | ||
8ed67789 DL |
1969 | struct arg_dev_net { |
1970 | struct net_device *dev; | |
1971 | struct net *net; | |
1972 | }; | |
1973 | ||
1da177e4 LT |
1974 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1975 | { | |
8ed67789 DL |
1976 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1977 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1978 | ||
1979 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1980 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1981 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1982 | return -1; | |
1983 | } | |
1984 | return 0; | |
1985 | } | |
1986 | ||
f3db4851 | 1987 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1988 | { |
8ed67789 DL |
1989 | struct arg_dev_net adn = { |
1990 | .dev = dev, | |
1991 | .net = net, | |
1992 | }; | |
1993 | ||
1994 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 1995 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
1996 | } |
1997 | ||
1998 | struct rt6_mtu_change_arg | |
1999 | { | |
2000 | struct net_device *dev; | |
2001 | unsigned mtu; | |
2002 | }; | |
2003 | ||
2004 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2005 | { | |
2006 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2007 | struct inet6_dev *idev; | |
c346dca1 | 2008 | struct net *net = dev_net(arg->dev); |
1da177e4 LT |
2009 | |
2010 | /* In IPv6 pmtu discovery is not optional, | |
2011 | so that RTAX_MTU lock cannot disable it. | |
2012 | We still use this lock to block changes | |
2013 | caused by addrconf/ndisc. | |
2014 | */ | |
2015 | ||
2016 | idev = __in6_dev_get(arg->dev); | |
2017 | if (idev == NULL) | |
2018 | return 0; | |
2019 | ||
2020 | /* For administrative MTU increase, there is no way to discover | |
2021 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2022 | Since RFC 1981 doesn't include administrative MTU increase | |
2023 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2024 | */ | |
2025 | /* | |
2026 | If new MTU is less than route PMTU, this new MTU will be the | |
2027 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2028 | decreases; if new MTU is greater than route PMTU, and the | |
2029 | old MTU is the lowest MTU in the path, update the route PMTU | |
2030 | to reflect the increase. In this case if the other nodes' MTU | |
2031 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2032 | PMTU discouvery. | |
2033 | */ | |
2034 | if (rt->rt6i_dev == arg->dev && | |
2035 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 2036 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 2037 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 2038 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 2039 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 2040 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 2041 | } |
1da177e4 LT |
2042 | return 0; |
2043 | } | |
2044 | ||
2045 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2046 | { | |
c71099ac TG |
2047 | struct rt6_mtu_change_arg arg = { |
2048 | .dev = dev, | |
2049 | .mtu = mtu, | |
2050 | }; | |
1da177e4 | 2051 | |
c346dca1 | 2052 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2053 | } |
2054 | ||
ef7c79ed | 2055 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2056 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2057 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2058 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2059 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2060 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2061 | }; | |
2062 | ||
2063 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2064 | struct fib6_config *cfg) | |
1da177e4 | 2065 | { |
86872cb5 TG |
2066 | struct rtmsg *rtm; |
2067 | struct nlattr *tb[RTA_MAX+1]; | |
2068 | int err; | |
1da177e4 | 2069 | |
86872cb5 TG |
2070 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2071 | if (err < 0) | |
2072 | goto errout; | |
1da177e4 | 2073 | |
86872cb5 TG |
2074 | err = -EINVAL; |
2075 | rtm = nlmsg_data(nlh); | |
2076 | memset(cfg, 0, sizeof(*cfg)); | |
2077 | ||
2078 | cfg->fc_table = rtm->rtm_table; | |
2079 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2080 | cfg->fc_src_len = rtm->rtm_src_len; | |
2081 | cfg->fc_flags = RTF_UP; | |
2082 | cfg->fc_protocol = rtm->rtm_protocol; | |
2083 | ||
2084 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2085 | cfg->fc_flags |= RTF_REJECT; | |
2086 | ||
2087 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2088 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2089 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2090 | |
2091 | if (tb[RTA_GATEWAY]) { | |
2092 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2093 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2094 | } |
86872cb5 TG |
2095 | |
2096 | if (tb[RTA_DST]) { | |
2097 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2098 | ||
2099 | if (nla_len(tb[RTA_DST]) < plen) | |
2100 | goto errout; | |
2101 | ||
2102 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2103 | } |
86872cb5 TG |
2104 | |
2105 | if (tb[RTA_SRC]) { | |
2106 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2107 | ||
2108 | if (nla_len(tb[RTA_SRC]) < plen) | |
2109 | goto errout; | |
2110 | ||
2111 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2112 | } |
86872cb5 TG |
2113 | |
2114 | if (tb[RTA_OIF]) | |
2115 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2116 | ||
2117 | if (tb[RTA_PRIORITY]) | |
2118 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2119 | ||
2120 | if (tb[RTA_METRICS]) { | |
2121 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2122 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2123 | } |
86872cb5 TG |
2124 | |
2125 | if (tb[RTA_TABLE]) | |
2126 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2127 | ||
2128 | err = 0; | |
2129 | errout: | |
2130 | return err; | |
1da177e4 LT |
2131 | } |
2132 | ||
c127ea2c | 2133 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2134 | { |
86872cb5 TG |
2135 | struct fib6_config cfg; |
2136 | int err; | |
1da177e4 | 2137 | |
86872cb5 TG |
2138 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2139 | if (err < 0) | |
2140 | return err; | |
2141 | ||
2142 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2143 | } |
2144 | ||
c127ea2c | 2145 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2146 | { |
86872cb5 TG |
2147 | struct fib6_config cfg; |
2148 | int err; | |
1da177e4 | 2149 | |
86872cb5 TG |
2150 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2151 | if (err < 0) | |
2152 | return err; | |
2153 | ||
2154 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2155 | } |
2156 | ||
339bf98f TG |
2157 | static inline size_t rt6_nlmsg_size(void) |
2158 | { | |
2159 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2160 | + nla_total_size(16) /* RTA_SRC */ | |
2161 | + nla_total_size(16) /* RTA_DST */ | |
2162 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2163 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2164 | + nla_total_size(4) /* RTA_TABLE */ | |
2165 | + nla_total_size(4) /* RTA_IIF */ | |
2166 | + nla_total_size(4) /* RTA_OIF */ | |
2167 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2168 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2169 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2170 | } | |
2171 | ||
191cd582 BH |
2172 | static int rt6_fill_node(struct net *net, |
2173 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2174 | struct in6_addr *dst, struct in6_addr *src, |
2175 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2176 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2177 | { |
2178 | struct rtmsg *rtm; | |
2d7202bf | 2179 | struct nlmsghdr *nlh; |
e3703b3d | 2180 | long expires; |
9e762a4a | 2181 | u32 table; |
1da177e4 LT |
2182 | |
2183 | if (prefix) { /* user wants prefix routes only */ | |
2184 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2185 | /* success since this is not a prefix route */ | |
2186 | return 1; | |
2187 | } | |
2188 | } | |
2189 | ||
2d7202bf TG |
2190 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2191 | if (nlh == NULL) | |
26932566 | 2192 | return -EMSGSIZE; |
2d7202bf TG |
2193 | |
2194 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2195 | rtm->rtm_family = AF_INET6; |
2196 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2197 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2198 | rtm->rtm_tos = 0; | |
c71099ac | 2199 | if (rt->rt6i_table) |
9e762a4a | 2200 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2201 | else |
9e762a4a PM |
2202 | table = RT6_TABLE_UNSPEC; |
2203 | rtm->rtm_table = table; | |
2d7202bf | 2204 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2205 | if (rt->rt6i_flags&RTF_REJECT) |
2206 | rtm->rtm_type = RTN_UNREACHABLE; | |
2207 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2208 | rtm->rtm_type = RTN_LOCAL; | |
2209 | else | |
2210 | rtm->rtm_type = RTN_UNICAST; | |
2211 | rtm->rtm_flags = 0; | |
2212 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2213 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2214 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2215 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2216 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2217 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2218 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2219 | rtm->rtm_protocol = RTPROT_RA; | |
2220 | ||
2221 | if (rt->rt6i_flags&RTF_CACHE) | |
2222 | rtm->rtm_flags |= RTM_F_CLONED; | |
2223 | ||
2224 | if (dst) { | |
2d7202bf | 2225 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2226 | rtm->rtm_dst_len = 128; |
1da177e4 | 2227 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2228 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2229 | #ifdef CONFIG_IPV6_SUBTREES |
2230 | if (src) { | |
2d7202bf | 2231 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2232 | rtm->rtm_src_len = 128; |
1da177e4 | 2233 | } else if (rtm->rtm_src_len) |
2d7202bf | 2234 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2235 | #endif |
7bc570c8 YH |
2236 | if (iif) { |
2237 | #ifdef CONFIG_IPV6_MROUTE | |
2238 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2239 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2240 | if (err <= 0) { |
2241 | if (!nowait) { | |
2242 | if (err == 0) | |
2243 | return 0; | |
2244 | goto nla_put_failure; | |
2245 | } else { | |
2246 | if (err == -EMSGSIZE) | |
2247 | goto nla_put_failure; | |
2248 | } | |
2249 | } | |
2250 | } else | |
2251 | #endif | |
2252 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2253 | } else if (dst) { | |
5e0115e5 | 2254 | struct inet6_dev *idev = ip6_dst_idev(&rt->u.dst); |
1da177e4 | 2255 | struct in6_addr saddr_buf; |
191cd582 | 2256 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2257 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2258 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2259 | } |
2d7202bf | 2260 | |
1da177e4 | 2261 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2262 | goto nla_put_failure; |
2263 | ||
1da177e4 | 2264 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2265 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2266 | ||
1da177e4 | 2267 | if (rt->u.dst.dev) |
2d7202bf TG |
2268 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2269 | ||
2270 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2271 | |
36e3deae YH |
2272 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2273 | expires = 0; | |
2274 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2275 | expires = rt->rt6i_expires - jiffies; | |
2276 | else | |
2277 | expires = INT_MAX; | |
69cdf8f9 | 2278 | |
e3703b3d TG |
2279 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, |
2280 | expires, rt->u.dst.error) < 0) | |
2281 | goto nla_put_failure; | |
2d7202bf TG |
2282 | |
2283 | return nlmsg_end(skb, nlh); | |
2284 | ||
2285 | nla_put_failure: | |
26932566 PM |
2286 | nlmsg_cancel(skb, nlh); |
2287 | return -EMSGSIZE; | |
1da177e4 LT |
2288 | } |
2289 | ||
1b43af54 | 2290 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2291 | { |
2292 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2293 | int prefix; | |
2294 | ||
2d7202bf TG |
2295 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2296 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2297 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2298 | } else | |
2299 | prefix = 0; | |
2300 | ||
191cd582 BH |
2301 | return rt6_fill_node(arg->net, |
2302 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2303 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2304 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2305 | } |
2306 | ||
c127ea2c | 2307 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2308 | { |
3b1e0a65 | 2309 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2310 | struct nlattr *tb[RTA_MAX+1]; |
2311 | struct rt6_info *rt; | |
1da177e4 | 2312 | struct sk_buff *skb; |
ab364a6f | 2313 | struct rtmsg *rtm; |
1da177e4 | 2314 | struct flowi fl; |
ab364a6f | 2315 | int err, iif = 0; |
1da177e4 | 2316 | |
ab364a6f TG |
2317 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2318 | if (err < 0) | |
2319 | goto errout; | |
1da177e4 | 2320 | |
ab364a6f | 2321 | err = -EINVAL; |
1da177e4 | 2322 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2323 | |
ab364a6f TG |
2324 | if (tb[RTA_SRC]) { |
2325 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2326 | goto errout; | |
2327 | ||
2328 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2329 | } | |
2330 | ||
2331 | if (tb[RTA_DST]) { | |
2332 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2333 | goto errout; | |
2334 | ||
2335 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2336 | } | |
2337 | ||
2338 | if (tb[RTA_IIF]) | |
2339 | iif = nla_get_u32(tb[RTA_IIF]); | |
2340 | ||
2341 | if (tb[RTA_OIF]) | |
2342 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2343 | |
2344 | if (iif) { | |
2345 | struct net_device *dev; | |
5578689a | 2346 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2347 | if (!dev) { |
2348 | err = -ENODEV; | |
ab364a6f | 2349 | goto errout; |
1da177e4 LT |
2350 | } |
2351 | } | |
2352 | ||
ab364a6f TG |
2353 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2354 | if (skb == NULL) { | |
2355 | err = -ENOBUFS; | |
2356 | goto errout; | |
2357 | } | |
1da177e4 | 2358 | |
ab364a6f TG |
2359 | /* Reserve room for dummy headers, this skb can pass |
2360 | through good chunk of routing engine. | |
2361 | */ | |
459a98ed | 2362 | skb_reset_mac_header(skb); |
ab364a6f | 2363 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2364 | |
8a3edd80 | 2365 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
2366 | skb->dst = &rt->u.dst; |
2367 | ||
191cd582 | 2368 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2369 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2370 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2371 | if (err < 0) { |
ab364a6f TG |
2372 | kfree_skb(skb); |
2373 | goto errout; | |
1da177e4 LT |
2374 | } |
2375 | ||
5578689a | 2376 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2377 | errout: |
1da177e4 | 2378 | return err; |
1da177e4 LT |
2379 | } |
2380 | ||
86872cb5 | 2381 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2382 | { |
2383 | struct sk_buff *skb; | |
5578689a | 2384 | struct net *net = info->nl_net; |
528c4ceb DL |
2385 | u32 seq; |
2386 | int err; | |
2387 | ||
2388 | err = -ENOBUFS; | |
2389 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2390 | |
339bf98f | 2391 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2392 | if (skb == NULL) |
2393 | goto errout; | |
2394 | ||
191cd582 | 2395 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2396 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2397 | if (err < 0) { |
2398 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2399 | WARN_ON(err == -EMSGSIZE); | |
2400 | kfree_skb(skb); | |
2401 | goto errout; | |
2402 | } | |
5578689a DL |
2403 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2404 | info->nlh, gfp_any()); | |
21713ebc TG |
2405 | errout: |
2406 | if (err < 0) | |
5578689a | 2407 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2408 | } |
2409 | ||
8ed67789 DL |
2410 | static int ip6_route_dev_notify(struct notifier_block *this, |
2411 | unsigned long event, void *data) | |
2412 | { | |
2413 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2414 | struct net *net = dev_net(dev); |
8ed67789 DL |
2415 | |
2416 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2417 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2418 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2419 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2420 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2421 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2422 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2423 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2424 | #endif | |
2425 | } | |
2426 | ||
2427 | return NOTIFY_OK; | |
2428 | } | |
2429 | ||
1da177e4 LT |
2430 | /* |
2431 | * /proc | |
2432 | */ | |
2433 | ||
2434 | #ifdef CONFIG_PROC_FS | |
2435 | ||
2436 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2437 | ||
2438 | struct rt6_proc_arg | |
2439 | { | |
2440 | char *buffer; | |
2441 | int offset; | |
2442 | int length; | |
2443 | int skip; | |
2444 | int len; | |
2445 | }; | |
2446 | ||
2447 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2448 | { | |
33120b30 | 2449 | struct seq_file *m = p_arg; |
1da177e4 | 2450 | |
4b7a4274 | 2451 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2452 | |
2453 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2454 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2455 | #else |
33120b30 | 2456 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2457 | #endif |
2458 | ||
2459 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2460 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2461 | } else { |
33120b30 | 2462 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2463 | } |
33120b30 AD |
2464 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2465 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2466 | rt->u.dst.__use, rt->rt6i_flags, | |
2467 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2468 | return 0; |
2469 | } | |
2470 | ||
33120b30 | 2471 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2472 | { |
f3db4851 DL |
2473 | struct net *net = (struct net *)m->private; |
2474 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2475 | return 0; |
2476 | } | |
1da177e4 | 2477 | |
33120b30 AD |
2478 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2479 | { | |
de05c557 | 2480 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2481 | } |
2482 | ||
33120b30 AD |
2483 | static const struct file_operations ipv6_route_proc_fops = { |
2484 | .owner = THIS_MODULE, | |
2485 | .open = ipv6_route_open, | |
2486 | .read = seq_read, | |
2487 | .llseek = seq_lseek, | |
b6fcbdb4 | 2488 | .release = single_release_net, |
33120b30 AD |
2489 | }; |
2490 | ||
1da177e4 LT |
2491 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2492 | { | |
69ddb805 | 2493 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2494 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2495 | net->ipv6.rt6_stats->fib_nodes, |
2496 | net->ipv6.rt6_stats->fib_route_nodes, | |
2497 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2498 | net->ipv6.rt6_stats->fib_rt_entries, | |
2499 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2500 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2501 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2502 | |
2503 | return 0; | |
2504 | } | |
2505 | ||
2506 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2507 | { | |
de05c557 | 2508 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2509 | } |
2510 | ||
9a32144e | 2511 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2512 | .owner = THIS_MODULE, |
2513 | .open = rt6_stats_seq_open, | |
2514 | .read = seq_read, | |
2515 | .llseek = seq_lseek, | |
b6fcbdb4 | 2516 | .release = single_release_net, |
1da177e4 LT |
2517 | }; |
2518 | #endif /* CONFIG_PROC_FS */ | |
2519 | ||
2520 | #ifdef CONFIG_SYSCTL | |
2521 | ||
1da177e4 LT |
2522 | static |
2523 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2524 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2525 | { | |
5b7c931d DL |
2526 | struct net *net = current->nsproxy->net_ns; |
2527 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2528 | if (write) { |
2529 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2530 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2531 | return 0; |
2532 | } else | |
2533 | return -EINVAL; | |
2534 | } | |
2535 | ||
760f2d01 | 2536 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2537 | { |
1da177e4 | 2538 | .procname = "flush", |
4990509f | 2539 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2540 | .maxlen = sizeof(int), |
89c8b3a1 | 2541 | .mode = 0200, |
6d9f239a | 2542 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2543 | }, |
2544 | { | |
2545 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2546 | .procname = "gc_thresh", | |
9a7ec3a9 | 2547 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2548 | .maxlen = sizeof(int), |
2549 | .mode = 0644, | |
6d9f239a | 2550 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2551 | }, |
2552 | { | |
2553 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2554 | .procname = "max_size", | |
4990509f | 2555 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2556 | .maxlen = sizeof(int), |
2557 | .mode = 0644, | |
6d9f239a | 2558 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2559 | }, |
2560 | { | |
2561 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2562 | .procname = "gc_min_interval", | |
4990509f | 2563 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2564 | .maxlen = sizeof(int), |
2565 | .mode = 0644, | |
6d9f239a AD |
2566 | .proc_handler = proc_dointvec_jiffies, |
2567 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2568 | }, |
2569 | { | |
2570 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2571 | .procname = "gc_timeout", | |
4990509f | 2572 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2573 | .maxlen = sizeof(int), |
2574 | .mode = 0644, | |
6d9f239a AD |
2575 | .proc_handler = proc_dointvec_jiffies, |
2576 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2577 | }, |
2578 | { | |
2579 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2580 | .procname = "gc_interval", | |
4990509f | 2581 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2582 | .maxlen = sizeof(int), |
2583 | .mode = 0644, | |
6d9f239a AD |
2584 | .proc_handler = proc_dointvec_jiffies, |
2585 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2586 | }, |
2587 | { | |
2588 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2589 | .procname = "gc_elasticity", | |
4990509f | 2590 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2591 | .maxlen = sizeof(int), |
2592 | .mode = 0644, | |
6d9f239a AD |
2593 | .proc_handler = proc_dointvec_jiffies, |
2594 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2595 | }, |
2596 | { | |
2597 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2598 | .procname = "mtu_expires", | |
4990509f | 2599 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2600 | .maxlen = sizeof(int), |
2601 | .mode = 0644, | |
6d9f239a AD |
2602 | .proc_handler = proc_dointvec_jiffies, |
2603 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2604 | }, |
2605 | { | |
2606 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2607 | .procname = "min_adv_mss", | |
4990509f | 2608 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2609 | .maxlen = sizeof(int), |
2610 | .mode = 0644, | |
6d9f239a AD |
2611 | .proc_handler = proc_dointvec_jiffies, |
2612 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2613 | }, |
2614 | { | |
2615 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2616 | .procname = "gc_min_interval_ms", | |
4990509f | 2617 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2618 | .maxlen = sizeof(int), |
2619 | .mode = 0644, | |
6d9f239a AD |
2620 | .proc_handler = proc_dointvec_ms_jiffies, |
2621 | .strategy = sysctl_ms_jiffies, | |
1da177e4 LT |
2622 | }, |
2623 | { .ctl_name = 0 } | |
2624 | }; | |
2625 | ||
760f2d01 DL |
2626 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2627 | { | |
2628 | struct ctl_table *table; | |
2629 | ||
2630 | table = kmemdup(ipv6_route_table_template, | |
2631 | sizeof(ipv6_route_table_template), | |
2632 | GFP_KERNEL); | |
5ee09105 YH |
2633 | |
2634 | if (table) { | |
2635 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2636 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2637 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2638 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2639 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2640 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2641 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2642 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2643 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2644 | } | |
2645 | ||
760f2d01 DL |
2646 | return table; |
2647 | } | |
1da177e4 LT |
2648 | #endif |
2649 | ||
cdb18761 DL |
2650 | static int ip6_route_net_init(struct net *net) |
2651 | { | |
633d424b | 2652 | int ret = -ENOMEM; |
8ed67789 | 2653 | |
f2fc6a54 BT |
2654 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2655 | sizeof(*net->ipv6.ip6_dst_ops), | |
2656 | GFP_KERNEL); | |
2657 | if (!net->ipv6.ip6_dst_ops) | |
2658 | goto out; | |
48115bec | 2659 | net->ipv6.ip6_dst_ops->dst_net = hold_net(net); |
f2fc6a54 | 2660 | |
8ed67789 DL |
2661 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2662 | sizeof(*net->ipv6.ip6_null_entry), | |
2663 | GFP_KERNEL); | |
2664 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2665 | goto out_ip6_dst_ops; |
8ed67789 DL |
2666 | net->ipv6.ip6_null_entry->u.dst.path = |
2667 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2668 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2669 | |
2670 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2671 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2672 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2673 | GFP_KERNEL); | |
68fffc67 PZ |
2674 | if (!net->ipv6.ip6_prohibit_entry) |
2675 | goto out_ip6_null_entry; | |
8ed67789 DL |
2676 | net->ipv6.ip6_prohibit_entry->u.dst.path = |
2677 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2678 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2679 | |
2680 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2681 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2682 | GFP_KERNEL); | |
68fffc67 PZ |
2683 | if (!net->ipv6.ip6_blk_hole_entry) |
2684 | goto out_ip6_prohibit_entry; | |
8ed67789 DL |
2685 | net->ipv6.ip6_blk_hole_entry->u.dst.path = |
2686 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2687 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2688 | #endif |
2689 | ||
b339a47c PZ |
2690 | net->ipv6.sysctl.flush_delay = 0; |
2691 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2692 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2693 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2694 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2695 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2696 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2697 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2698 | ||
cdb18761 DL |
2699 | #ifdef CONFIG_PROC_FS |
2700 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2701 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2702 | #endif | |
6891a346 BT |
2703 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2704 | ||
8ed67789 DL |
2705 | ret = 0; |
2706 | out: | |
2707 | return ret; | |
f2fc6a54 | 2708 | |
68fffc67 PZ |
2709 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2710 | out_ip6_prohibit_entry: | |
2711 | kfree(net->ipv6.ip6_prohibit_entry); | |
2712 | out_ip6_null_entry: | |
2713 | kfree(net->ipv6.ip6_null_entry); | |
2714 | #endif | |
f2fc6a54 | 2715 | out_ip6_dst_ops: |
48115bec | 2716 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 BT |
2717 | kfree(net->ipv6.ip6_dst_ops); |
2718 | goto out; | |
cdb18761 DL |
2719 | } |
2720 | ||
2721 | static void ip6_route_net_exit(struct net *net) | |
2722 | { | |
2723 | #ifdef CONFIG_PROC_FS | |
2724 | proc_net_remove(net, "ipv6_route"); | |
2725 | proc_net_remove(net, "rt6_stats"); | |
2726 | #endif | |
8ed67789 DL |
2727 | kfree(net->ipv6.ip6_null_entry); |
2728 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2729 | kfree(net->ipv6.ip6_prohibit_entry); | |
2730 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2731 | #endif | |
48115bec | 2732 | release_net(net->ipv6.ip6_dst_ops->dst_net); |
f2fc6a54 | 2733 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2734 | } |
2735 | ||
2736 | static struct pernet_operations ip6_route_net_ops = { | |
2737 | .init = ip6_route_net_init, | |
2738 | .exit = ip6_route_net_exit, | |
2739 | }; | |
2740 | ||
8ed67789 DL |
2741 | static struct notifier_block ip6_route_dev_notifier = { |
2742 | .notifier_call = ip6_route_dev_notify, | |
2743 | .priority = 0, | |
2744 | }; | |
2745 | ||
433d49c3 | 2746 | int __init ip6_route_init(void) |
1da177e4 | 2747 | { |
433d49c3 DL |
2748 | int ret; |
2749 | ||
9a7ec3a9 DL |
2750 | ret = -ENOMEM; |
2751 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2752 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2753 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2754 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2755 | goto out; |
14e50e57 | 2756 | |
8ed67789 DL |
2757 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2758 | if (ret) | |
bdb3289f | 2759 | goto out_kmem_cache; |
bdb3289f | 2760 | |
5dc121e9 AE |
2761 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2762 | ||
8ed67789 DL |
2763 | /* Registering of the loopback is done before this portion of code, |
2764 | * the loopback reference in rt6_info will not be taken, do it | |
2765 | * manually for init_net */ | |
2766 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2767 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2768 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2769 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2770 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2771 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2772 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2773 | #endif | |
433d49c3 DL |
2774 | ret = fib6_init(); |
2775 | if (ret) | |
8ed67789 | 2776 | goto out_register_subsys; |
433d49c3 | 2777 | |
433d49c3 DL |
2778 | ret = xfrm6_init(); |
2779 | if (ret) | |
cdb18761 | 2780 | goto out_fib6_init; |
c35b7e72 | 2781 | |
433d49c3 DL |
2782 | ret = fib6_rules_init(); |
2783 | if (ret) | |
2784 | goto xfrm6_init; | |
7e5449c2 | 2785 | |
433d49c3 DL |
2786 | ret = -ENOBUFS; |
2787 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2788 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2789 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2790 | goto fib6_rules_init; | |
c127ea2c | 2791 | |
8ed67789 | 2792 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2793 | if (ret) |
2794 | goto fib6_rules_init; | |
8ed67789 | 2795 | |
433d49c3 DL |
2796 | out: |
2797 | return ret; | |
2798 | ||
2799 | fib6_rules_init: | |
433d49c3 DL |
2800 | fib6_rules_cleanup(); |
2801 | xfrm6_init: | |
433d49c3 | 2802 | xfrm6_fini(); |
433d49c3 | 2803 | out_fib6_init: |
433d49c3 | 2804 | fib6_gc_cleanup(); |
8ed67789 DL |
2805 | out_register_subsys: |
2806 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2807 | out_kmem_cache: |
f2fc6a54 | 2808 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2809 | goto out; |
1da177e4 LT |
2810 | } |
2811 | ||
2812 | void ip6_route_cleanup(void) | |
2813 | { | |
8ed67789 | 2814 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2815 | fib6_rules_cleanup(); |
1da177e4 | 2816 | xfrm6_fini(); |
1da177e4 | 2817 | fib6_gc_cleanup(); |
8ed67789 | 2818 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2819 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2820 | } |