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net: sctp: Don't transition to PF state when transport has exhausted 'Path.Max.Retrans'.
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / route.c
CommitLineData
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
f3213831
JP		 27#define pr_fmt(fmt) "IPv6: " fmt
28
4fc268d2 29#include <linux/capability.h>
1da177e4 30#include <linux/errno.h>
bc3b2d7f 31#include <linux/export.h>
1da177e4
LT		 32#include <linux/types.h>
33#include <linux/times.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/net.h>
37#include <linux/route.h>
38#include <linux/netdevice.h>
39#include <linux/in6.h>
7bc570c8 40#include <linux/mroute6.h>
1da177e4 41#include <linux/init.h>
1da177e4 42#include <linux/if_arp.h>
1da177e4
LT		 43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
5b7c931d 45#include <linux/nsproxy.h>
5a0e3ad6 46#include <linux/slab.h>
457c4cbc 47#include <net/net_namespace.h>
1da177e4
LT		 48#include <net/snmp.h>
49#include <net/ipv6.h>
50#include <net/ip6_fib.h>
51#include <net/ip6_route.h>
52#include <net/ndisc.h>
53#include <net/addrconf.h>
54#include <net/tcp.h>
55#include <linux/rtnetlink.h>
56#include <net/dst.h>
57#include <net/xfrm.h>
8d71740c 58#include <net/netevent.h>
21713ebc 59#include <net/netlink.h>
51ebd318 60#include <net/nexthop.h>
1da177e4
LT		 61
62#include <asm/uaccess.h>
63
64#ifdef CONFIG_SYSCTL
65#include <linux/sysctl.h>
66#endif
67
afc154e9 68enum rt6_nud_state {
7e980569
JB		 69 RT6_NUD_FAIL_HARD = -3,
70 RT6_NUD_FAIL_PROBE = -2,
71 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 72 RT6_NUD_SUCCEED = 1
73};
74
1716a961 75static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
21efcfa0 76 const struct in6_addr *dest);
1da177e4 77static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 78static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 79static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 80static struct dst_entry *ip6_negative_advice(struct dst_entry *);
81static void ip6_dst_destroy(struct dst_entry *);
82static void ip6_dst_ifdown(struct dst_entry *,
83 struct net_device *dev, int how);
569d3645 84static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 85
86static int ip6_pkt_discard(struct sk_buff *skb);
aad88724 87static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
7150aede 88static int ip6_pkt_prohibit(struct sk_buff *skb);
aad88724 89static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
1da177e4 90static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 91static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
92 struct sk_buff *skb, u32 mtu);
93static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
94 struct sk_buff *skb);
52bd4c0c 95static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 96
70ceb4f5 97#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 98static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 99 const struct in6_addr *prefix, int prefixlen,
100 const struct in6_addr *gwaddr, int ifindex,
95c96174 101 unsigned int pref);
efa2cea0 102static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 105#endif
106
e8243534 107static void rt6_bind_peer(struct rt6_info *rt, int create)
108{
109 struct inet_peer_base *base;
110 struct inet_peer *peer;
111
112 base = inetpeer_base_ptr(rt->_rt6i_peer);
113 if (!base)
114 return;
115
116 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
117 if (peer) {
118 if (!rt6_set_peer(rt, peer))
119 inet_putpeer(peer);
120 }
121}
122
123static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
124{
125 if (rt6_has_peer(rt))
126 return rt6_peer_ptr(rt);
127
128 rt6_bind_peer(rt, create);
129 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
130}
131
132static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
133{
134 return __rt6_get_peer(rt, 1);
135}
136
06582540
DM		 137static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
138{
139 struct rt6_info *rt = (struct rt6_info *) dst;
140 struct inet_peer *peer;
141 u32 *p = NULL;
142
8e2ec639
YZ		 143 if (!(rt->dst.flags & DST_HOST))
144 return NULL;
145
fbfe95a4 146 peer = rt6_get_peer_create(rt);
06582540
DM		 147 if (peer) {
148 u32 *old_p = __DST_METRICS_PTR(old);
149 unsigned long prev, new;
150
151 p = peer->metrics;
e5fd387a
MK		 152 if (inet_metrics_new(peer) ||
153 (old & DST_METRICS_FORCE_OVERWRITE))
06582540
DM		 154 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
155
156 new = (unsigned long) p;
157 prev = cmpxchg(&dst->_metrics, old, new);
158
159 if (prev != old) {
160 p = __DST_METRICS_PTR(prev);
161 if (prev & DST_METRICS_READ_ONLY)
162 p = NULL;
163 }
164 }
165 return p;
166}
167
f894cbf8
DM		 168static inline const void *choose_neigh_daddr(struct rt6_info *rt,
169 struct sk_buff *skb,
170 const void *daddr)
39232973
DM		 171{
172 struct in6_addr *p = &rt->rt6i_gateway;
173
a7563f34 174 if (!ipv6_addr_any(p))
39232973 175 return (const void *) p;
f894cbf8
DM		 176 else if (skb)
177 return &ipv6_hdr(skb)->daddr;
39232973
DM		 178 return daddr;
179}
180
f894cbf8
DM		 181static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
182 struct sk_buff *skb,
183 const void *daddr)
d3aaeb38 184{
39232973
DM		 185 struct rt6_info *rt = (struct rt6_info *) dst;
186 struct neighbour *n;
187
f894cbf8 188 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 189 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 190 if (n)
191 return n;
192 return neigh_create(&nd_tbl, daddr, dst->dev);
193}
194
9a7ec3a9 195static struct dst_ops ip6_dst_ops_template = {
1da177e4 196 .family = AF_INET6,
09640e63 197 .protocol = cpu_to_be16(ETH_P_IPV6),
1da177e4
LT		 198 .gc = ip6_dst_gc,
199 .gc_thresh = 1024,
200 .check = ip6_dst_check,
0dbaee3b 201 .default_advmss = ip6_default_advmss,
ebb762f2 202 .mtu = ip6_mtu,
06582540 203 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 204 .destroy = ip6_dst_destroy,
205 .ifdown = ip6_dst_ifdown,
206 .negative_advice = ip6_negative_advice,
207 .link_failure = ip6_link_failure,
208 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 209 .redirect = rt6_do_redirect,
1ac06e03 210 .local_out = __ip6_local_out,
d3aaeb38 211 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 212};
213
ebb762f2 214static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 215{
618f9bc7
SK		 216 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
217
218 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 219}
220
6700c270
DM		 221static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
222 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 223{
224}
225
6700c270
DM		 226static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
227 struct sk_buff *skb)
b587ee3b
DM		 228{
229}
230
0972ddb2
HB		 231static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
232 unsigned long old)
233{
234 return NULL;
235}
236
14e50e57
DM		 237static struct dst_ops ip6_dst_blackhole_ops = {
238 .family = AF_INET6,
09640e63 239 .protocol = cpu_to_be16(ETH_P_IPV6),
14e50e57
DM		 240 .destroy = ip6_dst_destroy,
241 .check = ip6_dst_check,
ebb762f2 242 .mtu = ip6_blackhole_mtu,
214f45c9 243 .default_advmss = ip6_default_advmss,
14e50e57 244 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 245 .redirect = ip6_rt_blackhole_redirect,
0972ddb2 246 .cow_metrics = ip6_rt_blackhole_cow_metrics,
d3aaeb38 247 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 248};
249
62fa8a84 250static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 251 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 252};
253
fb0af4c7 254static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 255 .dst = {
256 .__refcnt = ATOMIC_INIT(1),
257 .__use = 1,
2c20cbd7 258 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 259 .error = -ENETUNREACH,
d8d1f30b
CG		 260 .input = ip6_pkt_discard,
261 .output = ip6_pkt_discard_out,
1da177e4
LT		 262 },
263 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 264 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 265 .rt6i_metric = ~(u32) 0,
266 .rt6i_ref = ATOMIC_INIT(1),
267};
268
101367c2
TG		 269#ifdef CONFIG_IPV6_MULTIPLE_TABLES
270
fb0af4c7 271static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 272 .dst = {
273 .__refcnt = ATOMIC_INIT(1),
274 .__use = 1,
2c20cbd7 275 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 276 .error = -EACCES,
d8d1f30b
CG		 277 .input = ip6_pkt_prohibit,
278 .output = ip6_pkt_prohibit_out,
101367c2
TG		 279 },
280 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 281 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 282 .rt6i_metric = ~(u32) 0,
283 .rt6i_ref = ATOMIC_INIT(1),
284};
285
fb0af4c7 286static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
2c20cbd7 290 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 291 .error = -EINVAL,
d8d1f30b 292 .input = dst_discard,
aad88724 293 .output = dst_discard_sk,
101367c2
TG		 294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 296 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299};
300
301#endif
302
1da177e4 303/* allocate dst with ip6_dst_ops */
97bab73f 304static inline struct rt6_info *ip6_dst_alloc(struct net *net,
957c665f 305 struct net_device *dev,
8b96d22d
DM		 306 int flags,
307 struct fib6_table *table)
1da177e4 308{
97bab73f 309 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 310 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 311
97bab73f 312 if (rt) {
8104891b
SK		 313 struct dst_entry *dst = &rt->dst;
314
315 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
8b96d22d 316 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
ca4c3fc2 317 rt->rt6i_genid = rt_genid_ipv6(net);
51ebd318 318 INIT_LIST_HEAD(&rt->rt6i_siblings);
97bab73f 319 }
cf911662 320 return rt;
1da177e4
LT		 321}
322
323static void ip6_dst_destroy(struct dst_entry *dst)
324{
325 struct rt6_info *rt = (struct rt6_info *)dst;
326 struct inet6_dev *idev = rt->rt6i_idev;
ecd98837 327 struct dst_entry *from = dst->from;
1da177e4 328
8e2ec639
YZ		 329 if (!(rt->dst.flags & DST_HOST))
330 dst_destroy_metrics_generic(dst);
331
38308473 332 if (idev) {
1da177e4
LT		 333 rt->rt6i_idev = NULL;
334 in6_dev_put(idev);
1ab1457c 335 }
1716a961 336
ecd98837
YH		 337 dst->from = NULL;
338 dst_release(from);
1716a961 339
97bab73f
DM		 340 if (rt6_has_peer(rt)) {
341 struct inet_peer *peer = rt6_peer_ptr(rt);
b3419363
DM		 342 inet_putpeer(peer);
343 }
344}
345
1da177e4
LT		 346static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
347 int how)
348{
349 struct rt6_info *rt = (struct rt6_info *)dst;
350 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 351 struct net_device *loopback_dev =
c346dca1 352 dev_net(dev)->loopback_dev;
1da177e4 353
97cac082
DM		 354 if (dev != loopback_dev) {
355 if (idev && idev->dev == dev) {
356 struct inet6_dev *loopback_idev =
357 in6_dev_get(loopback_dev);
358 if (loopback_idev) {
359 rt->rt6i_idev = loopback_idev;
360 in6_dev_put(idev);
361 }
362 }
1da177e4
LT		 363 }
364}
365
a50feda5 366static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 367{
1716a961
G		 368 if (rt->rt6i_flags & RTF_EXPIRES) {
369 if (time_after(jiffies, rt->dst.expires))
a50feda5 370 return true;
1716a961 371 } else if (rt->dst.from) {
3fd91fb3 372 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 373 }
a50feda5 374 return false;
1da177e4
LT		 375}
376
51ebd318
ND		 377/* Multipath route selection:
378 * Hash based function using packet header and flowlabel.
379 * Adapted from fib_info_hashfn()
380 */
381static int rt6_info_hash_nhsfn(unsigned int candidate_count,
382 const struct flowi6 *fl6)
383{
384 unsigned int val = fl6->flowi6_proto;
385
c08977bb
YH		 386 val ^= ipv6_addr_hash(&fl6->daddr);
387 val ^= ipv6_addr_hash(&fl6->saddr);
51ebd318
ND		 388
389 /* Work only if this not encapsulated */
390 switch (fl6->flowi6_proto) {
391 case IPPROTO_UDP:
392 case IPPROTO_TCP:
393 case IPPROTO_SCTP:
b3ce5ae1
ND		 394 val ^= (__force u16)fl6->fl6_sport;
395 val ^= (__force u16)fl6->fl6_dport;
51ebd318
ND		 396 break;
397
398 case IPPROTO_ICMPV6:
b3ce5ae1
ND		 399 val ^= (__force u16)fl6->fl6_icmp_type;
400 val ^= (__force u16)fl6->fl6_icmp_code;
51ebd318
ND		 401 break;
402 }
403 /* RFC6438 recommands to use flowlabel */
b3ce5ae1 404 val ^= (__force u32)fl6->flowlabel;
51ebd318
ND		 405
406 /* Perhaps, we need to tune, this function? */
407 val = val ^ (val >> 7) ^ (val >> 12);
408 return val % candidate_count;
409}
410
411static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 412 struct flowi6 *fl6, int oif,
413 int strict)
51ebd318
ND		 414{
415 struct rt6_info *sibling, *next_sibling;
416 int route_choosen;
417
418 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
419 /* Don't change the route, if route_choosen == 0
420 * (siblings does not include ourself)
421 */
422 if (route_choosen)
423 list_for_each_entry_safe(sibling, next_sibling,
424 &match->rt6i_siblings, rt6i_siblings) {
425 route_choosen--;
426 if (route_choosen == 0) {
52bd4c0c
ND		 427 if (rt6_score_route(sibling, oif, strict) < 0)
428 break;
51ebd318
ND		 429 match = sibling;
430 break;
431 }
432 }
433 return match;
434}
435
1da177e4 436/*
c71099ac 437 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 438 */
439
8ed67789
DL		 440static inline struct rt6_info *rt6_device_match(struct net *net,
441 struct rt6_info *rt,
b71d1d42 442 const struct in6_addr *saddr,
1da177e4 443 int oif,
d420895e 444 int flags)
1da177e4
LT		 445{
446 struct rt6_info *local = NULL;
447 struct rt6_info *sprt;
448
dd3abc4e
YH		 449 if (!oif && ipv6_addr_any(saddr))
450 goto out;
451
d8d1f30b 452 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 453 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 454
455 if (oif) {
1da177e4
LT		 456 if (dev->ifindex == oif)
457 return sprt;
458 if (dev->flags & IFF_LOOPBACK) {
38308473 459 if (!sprt->rt6i_idev ||
1da177e4 460 sprt->rt6i_idev->dev->ifindex != oif) {
d420895e 461 if (flags & RT6_LOOKUP_F_IFACE && oif)
1da177e4 462 continue;
1ab1457c 463 if (local && (!oif ||
1da177e4
LT		 464 local->rt6i_idev->dev->ifindex == oif))
465 continue;
466 }
467 local = sprt;
468 }
dd3abc4e
YH		 469 } else {
470 if (ipv6_chk_addr(net, saddr, dev,
471 flags & RT6_LOOKUP_F_IFACE))
472 return sprt;
1da177e4 473 }
dd3abc4e 474 }
1da177e4 475
dd3abc4e 476 if (oif) {
1da177e4
LT		 477 if (local)
478 return local;
479
d420895e 480 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 481 return net->ipv6.ip6_null_entry;
1da177e4 482 }
dd3abc4e 483out:
1da177e4
LT		 484 return rt;
485}
486
27097255 487#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 488struct __rt6_probe_work {
489 struct work_struct work;
490 struct in6_addr target;
491 struct net_device *dev;
492};
493
494static void rt6_probe_deferred(struct work_struct *w)
495{
496 struct in6_addr mcaddr;
497 struct __rt6_probe_work *work =
498 container_of(w, struct __rt6_probe_work, work);
499
500 addrconf_addr_solict_mult(&work->target, &mcaddr);
501 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
502 dev_put(work->dev);
503 kfree(w);
504}
505
27097255
YH		 506static void rt6_probe(struct rt6_info *rt)
507{
f2c31e32 508 struct neighbour *neigh;
27097255
YH		 509 /*
510 * Okay, this does not seem to be appropriate
511 * for now, however, we need to check if it
512 * is really so; aka Router Reachability Probing.
513 *
514 * Router Reachability Probe MUST be rate-limited
515 * to no more than one per minute.
516 */
2152caea 517 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 518 return;
2152caea
YH		 519 rcu_read_lock_bh();
520 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
521 if (neigh) {
522 write_lock(&neigh->lock);
523 if (neigh->nud_state & NUD_VALID)
524 goto out;
7ff74a59 525 }
2152caea
YH		 526
527 if (!neigh ||
52e16356 528 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
c2f17e82 529 struct __rt6_probe_work *work;
27097255 530
c2f17e82
HFS		 531 work = kmalloc(sizeof(*work), GFP_ATOMIC);
532
533 if (neigh && work)
7e980569 534 __neigh_set_probe_once(neigh);
c2f17e82
HFS		 535
536 if (neigh)
2152caea
YH		 537 write_unlock(&neigh->lock);
538
c2f17e82
HFS		 539 if (work) {
540 INIT_WORK(&work->work, rt6_probe_deferred);
541 work->target = rt->rt6i_gateway;
542 dev_hold(rt->dst.dev);
543 work->dev = rt->dst.dev;
544 schedule_work(&work->work);
545 }
f2c31e32 546 } else {
2152caea
YH		 547out:
548 write_unlock(&neigh->lock);
f2c31e32 549 }
2152caea 550 rcu_read_unlock_bh();
27097255
YH		 551}
552#else
553static inline void rt6_probe(struct rt6_info *rt)
554{
27097255
YH		 555}
556#endif
557
1da177e4 558/*
554cfb7e 559 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 560 */
b6f99a21 561static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 562{
d1918542 563 struct net_device *dev = rt->dst.dev;
161980f4 564 if (!oif || dev->ifindex == oif)
554cfb7e 565 return 2;
161980f4
DM		 566 if ((dev->flags & IFF_LOOPBACK) &&
567 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
568 return 1;
569 return 0;
554cfb7e 570}
1da177e4 571
afc154e9 572static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 573{
f2c31e32 574 struct neighbour *neigh;
afc154e9 575 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 576
4d0c5911
YH		 577 if (rt->rt6i_flags & RTF_NONEXTHOP ||
578 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 579 return RT6_NUD_SUCCEED;
145a3621
YH		 580
581 rcu_read_lock_bh();
582 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
583 if (neigh) {
584 read_lock(&neigh->lock);
554cfb7e 585 if (neigh->nud_state & NUD_VALID)
afc154e9 586 ret = RT6_NUD_SUCCEED;
398bcbeb 587#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 588 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 589 ret = RT6_NUD_SUCCEED;
7e980569
JB		 590 else
591 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 592#endif
145a3621 593 read_unlock(&neigh->lock);
afc154e9
HFS		 594 } else {
595 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 596 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 597 }
145a3621
YH		 598 rcu_read_unlock_bh();
599
a5a81f0b 600 return ret;
1da177e4
LT		 601}
602
554cfb7e
YH		 603static int rt6_score_route(struct rt6_info *rt, int oif,
604 int strict)
1da177e4 605{
a5a81f0b 606 int m;
1ab1457c 607
4d0c5911 608 m = rt6_check_dev(rt, oif);
77d16f45 609 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 610 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 611#ifdef CONFIG_IPV6_ROUTER_PREF
612 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
613#endif
afc154e9
HFS		 614 if (strict & RT6_LOOKUP_F_REACHABLE) {
615 int n = rt6_check_neigh(rt);
616 if (n < 0)
617 return n;
618 }
554cfb7e
YH		 619 return m;
620}
621
f11e6659 622static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 623 int *mpri, struct rt6_info *match,
624 bool *do_rr)
554cfb7e 625{
f11e6659 626 int m;
afc154e9 627 bool match_do_rr = false;
f11e6659
DM		 628
629 if (rt6_check_expired(rt))
630 goto out;
631
632 m = rt6_score_route(rt, oif, strict);
7e980569 633 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 634 match_do_rr = true;
635 m = 0; /* lowest valid score */
7e980569 636 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 637 goto out;
afc154e9
HFS		 638 }
639
640 if (strict & RT6_LOOKUP_F_REACHABLE)
641 rt6_probe(rt);
f11e6659 642
7e980569 643 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 644 if (m > *mpri) {
afc154e9 645 *do_rr = match_do_rr;
f11e6659
DM		 646 *mpri = m;
647 match = rt;
f11e6659 648 }
f11e6659
DM		 649out:
650 return match;
651}
652
653static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
654 struct rt6_info *rr_head,
afc154e9
HFS		 655 u32 metric, int oif, int strict,
656 bool *do_rr)
f11e6659
DM		 657{
658 struct rt6_info *rt, *match;
554cfb7e 659 int mpri = -1;
1da177e4 660
f11e6659
DM		 661 match = NULL;
662 for (rt = rr_head; rt && rt->rt6i_metric == metric;
d8d1f30b 663 rt = rt->dst.rt6_next)
afc154e9 664 match = find_match(rt, oif, strict, &mpri, match, do_rr);
f11e6659 665 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
d8d1f30b 666 rt = rt->dst.rt6_next)
afc154e9 667 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 668
f11e6659
DM		 669 return match;
670}
1da177e4 671
f11e6659
DM		 672static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
673{
674 struct rt6_info *match, *rt0;
8ed67789 675 struct net *net;
afc154e9 676 bool do_rr = false;
1da177e4 677
f11e6659
DM		 678 rt0 = fn->rr_ptr;
679 if (!rt0)
680 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 681
afc154e9
HFS		 682 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
683 &do_rr);
1da177e4 684
afc154e9 685 if (do_rr) {
d8d1f30b 686 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 687
554cfb7e 688 /* no entries matched; do round-robin */
f11e6659
DM		 689 if (!next || next->rt6i_metric != rt0->rt6i_metric)
690 next = fn->leaf;
691
692 if (next != rt0)
693 fn->rr_ptr = next;
1da177e4 694 }
1da177e4 695
d1918542 696 net = dev_net(rt0->dst.dev);
a02cec21 697 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 698}
699
70ceb4f5
YH		 700#ifdef CONFIG_IPV6_ROUTE_INFO
701int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 702 const struct in6_addr *gwaddr)
70ceb4f5 703{
c346dca1 704 struct net *net = dev_net(dev);
70ceb4f5
YH		 705 struct route_info *rinfo = (struct route_info *) opt;
706 struct in6_addr prefix_buf, *prefix;
707 unsigned int pref;
4bed72e4 708 unsigned long lifetime;
70ceb4f5
YH		 709 struct rt6_info *rt;
710
711 if (len < sizeof(struct route_info)) {
712 return -EINVAL;
713 }
714
715 /* Sanity check for prefix_len and length */
716 if (rinfo->length > 3) {
717 return -EINVAL;
718 } else if (rinfo->prefix_len > 128) {
719 return -EINVAL;
720 } else if (rinfo->prefix_len > 64) {
721 if (rinfo->length < 2) {
722 return -EINVAL;
723 }
724 } else if (rinfo->prefix_len > 0) {
725 if (rinfo->length < 1) {
726 return -EINVAL;
727 }
728 }
729
730 pref = rinfo->route_pref;
731 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 732 return -EINVAL;
70ceb4f5 733
4bed72e4 734 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 735
736 if (rinfo->length == 3)
737 prefix = (struct in6_addr *)rinfo->prefix;
738 else {
739 /* this function is safe */
740 ipv6_addr_prefix(&prefix_buf,
741 (struct in6_addr *)rinfo->prefix,
742 rinfo->prefix_len);
743 prefix = &prefix_buf;
744 }
745
f104a567
DJ		 746 if (rinfo->prefix_len == 0)
747 rt = rt6_get_dflt_router(gwaddr, dev);
748 else
749 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
750 gwaddr, dev->ifindex);
70ceb4f5
YH		 751
752 if (rt && !lifetime) {
e0a1ad73 753 ip6_del_rt(rt);
70ceb4f5
YH		 754 rt = NULL;
755 }
756
757 if (!rt && lifetime)
efa2cea0 758 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 759 pref);
760 else if (rt)
761 rt->rt6i_flags = RTF_ROUTEINFO |
762 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
763
764 if (rt) {
1716a961
G		 765 if (!addrconf_finite_timeout(lifetime))
766 rt6_clean_expires(rt);
767 else
768 rt6_set_expires(rt, jiffies + HZ * lifetime);
769
94e187c0 770 ip6_rt_put(rt);
70ceb4f5
YH		 771 }
772 return 0;
773}
774#endif
775
8ed67789 776#define BACKTRACK(__net, saddr) \
982f56f3 777do { \
8ed67789 778 if (rt == __net->ipv6.ip6_null_entry) { \
982f56f3 779 struct fib6_node *pn; \
e0eda7bb 780 while (1) { \
982f56f3
YH		 781 if (fn->fn_flags & RTN_TL_ROOT) \
782 goto out; \
783 pn = fn->parent; \
784 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
8bce65b9 785 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
982f56f3
YH		 786 else \
787 fn = pn; \
788 if (fn->fn_flags & RTN_RTINFO) \
789 goto restart; \
c71099ac 790 } \
c71099ac 791 } \
38308473 792} while (0)
c71099ac 793
8ed67789
DL		 794static struct rt6_info *ip6_pol_route_lookup(struct net *net,
795 struct fib6_table *table,
4c9483b2 796 struct flowi6 *fl6, int flags)
1da177e4
LT		 797{
798 struct fib6_node *fn;
799 struct rt6_info *rt;
800
c71099ac 801 read_lock_bh(&table->tb6_lock);
4c9483b2 802 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 803restart:
804 rt = fn->leaf;
4c9483b2 805 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 806 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 807 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
4c9483b2 808 BACKTRACK(net, &fl6->saddr);
c71099ac 809out:
d8d1f30b 810 dst_use(&rt->dst, jiffies);
c71099ac 811 read_unlock_bh(&table->tb6_lock);
c71099ac
TG		 812 return rt;
813
814}
815
ea6e574e
FW		 816struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
817 int flags)
818{
819 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
820}
821EXPORT_SYMBOL_GPL(ip6_route_lookup);
822
9acd9f3a
YH		 823struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
824 const struct in6_addr *saddr, int oif, int strict)
c71099ac 825{
4c9483b2
DM		 826 struct flowi6 fl6 = {
827 .flowi6_oif = oif,
828 .daddr = *daddr,
c71099ac
TG		 829 };
830 struct dst_entry *dst;
77d16f45 831 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 832
adaa70bb 833 if (saddr) {
4c9483b2 834 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 835 flags |= RT6_LOOKUP_F_HAS_SADDR;
836 }
837
4c9483b2 838 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 839 if (dst->error == 0)
840 return (struct rt6_info *) dst;
841
842 dst_release(dst);
843
1da177e4
LT		 844 return NULL;
845}
846
7159039a
YH		 847EXPORT_SYMBOL(rt6_lookup);
848
c71099ac 849/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 850 It takes new route entry, the addition fails by any reason the
851 route is freed. In any case, if caller does not hold it, it may
852 be destroyed.
853 */
854
e5fd387a
MK		 855static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
856 struct nlattr *mx, int mx_len)
1da177e4
LT		 857{
858 int err;
c71099ac 859 struct fib6_table *table;
1da177e4 860
c71099ac
TG		 861 table = rt->rt6i_table;
862 write_lock_bh(&table->tb6_lock);
e5fd387a 863 err = fib6_add(&table->tb6_root, rt, info, mx, mx_len);
c71099ac 864 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 865
866 return err;
867}
868
40e22e8f
TG		 869int ip6_ins_rt(struct rt6_info *rt)
870{
4d1169c1 871 struct nl_info info = {
d1918542 872 .nl_net = dev_net(rt->dst.dev),
4d1169c1 873 };
e5fd387a 874 return __ip6_ins_rt(rt, &info, NULL, 0);
40e22e8f
TG		 875}
876
1716a961 877static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
21efcfa0 878 const struct in6_addr *daddr,
b71d1d42 879 const struct in6_addr *saddr)
1da177e4 880{
1da177e4
LT		 881 struct rt6_info *rt;
882
883 /*
884 * Clone the route.
885 */
886
21efcfa0 887 rt = ip6_rt_copy(ort, daddr);
1da177e4
LT		 888
889 if (rt) {
249a3630
DJ		 890 if (ort->rt6i_dst.plen != 128 &&
891 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
892 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 893
1da177e4 894 rt->rt6i_flags |= RTF_CACHE;
1da177e4
LT		 895
896#ifdef CONFIG_IPV6_SUBTREES
897 if (rt->rt6i_src.plen && saddr) {
4e3fd7a0 898 rt->rt6i_src.addr = *saddr;
1da177e4
LT		 899 rt->rt6i_src.plen = 128;
900 }
901#endif
95a9a5ba 902 }
1da177e4 903
95a9a5ba
YH		 904 return rt;
905}
1da177e4 906
21efcfa0
ED		 907static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
908 const struct in6_addr *daddr)
299d9939 909{
21efcfa0
ED		 910 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
911
887c95cc 912 if (rt)
299d9939 913 rt->rt6i_flags |= RTF_CACHE;
299d9939
YH		 914 return rt;
915}
916
8ed67789 917static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
4c9483b2 918 struct flowi6 *fl6, int flags)
1da177e4
LT		 919{
920 struct fib6_node *fn;
519fbd87 921 struct rt6_info *rt, *nrt;
c71099ac 922 int strict = 0;
1da177e4 923 int attempts = 3;
519fbd87 924 int err;
53b7997f 925 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
1da177e4 926
77d16f45 927 strict |= flags & RT6_LOOKUP_F_IFACE;
1da177e4
LT		 928
929relookup:
c71099ac 930 read_lock_bh(&table->tb6_lock);
1da177e4 931
8238dd06 932restart_2:
4c9483b2 933 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1da177e4
LT		 934
935restart:
4acad72d 936 rt = rt6_select(fn, oif, strict | reachable);
52bd4c0c
ND		 937 if (rt->rt6i_nsiblings)
938 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
4c9483b2 939 BACKTRACK(net, &fl6->saddr);
8ed67789 940 if (rt == net->ipv6.ip6_null_entry ||
8238dd06 941 rt->rt6i_flags & RTF_CACHE)
1ddef044 942 goto out;
1da177e4 943
d8d1f30b 944 dst_hold(&rt->dst);
c71099ac 945 read_unlock_bh(&table->tb6_lock);
fb9de91e 946
c440f160 947 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
4c9483b2 948 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
7343ff31 949 else if (!(rt->dst.flags & DST_HOST))
4c9483b2 950 nrt = rt6_alloc_clone(rt, &fl6->daddr);
7343ff31
DM		 951 else
952 goto out2;
e40cf353 953
94e187c0 954 ip6_rt_put(rt);
8ed67789 955 rt = nrt ? : net->ipv6.ip6_null_entry;
1da177e4 956
d8d1f30b 957 dst_hold(&rt->dst);
519fbd87 958 if (nrt) {
40e22e8f 959 err = ip6_ins_rt(nrt);
519fbd87 960 if (!err)
1da177e4 961 goto out2;
1da177e4 962 }
1da177e4 963
519fbd87
YH		 964 if (--attempts <= 0)
965 goto out2;
966
967 /*
c71099ac 968 * Race condition! In the gap, when table->tb6_lock was
519fbd87
YH		 969 * released someone could insert this route. Relookup.
970 */
94e187c0 971 ip6_rt_put(rt);
519fbd87
YH		 972 goto relookup;
973
974out:
8238dd06
YH		 975 if (reachable) {
976 reachable = 0;
977 goto restart_2;
978 }
d8d1f30b 979 dst_hold(&rt->dst);
c71099ac 980 read_unlock_bh(&table->tb6_lock);
1da177e4 981out2:
d8d1f30b
CG		 982 rt->dst.lastuse = jiffies;
983 rt->dst.__use++;
c71099ac
TG		 984
985 return rt;
1da177e4
LT		 986}
987
8ed67789 988static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 989 struct flowi6 *fl6, int flags)
4acad72d 990{
4c9483b2 991 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 992}
993
72331bc0
SL		 994static struct dst_entry *ip6_route_input_lookup(struct net *net,
995 struct net_device *dev,
996 struct flowi6 *fl6, int flags)
997{
998 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
999 flags |= RT6_LOOKUP_F_IFACE;
1000
1001 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1002}
1003
c71099ac
TG		 1004void ip6_route_input(struct sk_buff *skb)
1005{
b71d1d42 1006 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1007 struct net *net = dev_net(skb->dev);
adaa70bb 1008 int flags = RT6_LOOKUP_F_HAS_SADDR;
4c9483b2
DM		 1009 struct flowi6 fl6 = {
1010 .flowi6_iif = skb->dev->ifindex,
1011 .daddr = iph->daddr,
1012 .saddr = iph->saddr,
6502ca52 1013 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1014 .flowi6_mark = skb->mark,
1015 .flowi6_proto = iph->nexthdr,
c71099ac 1016 };
adaa70bb 1017
72331bc0 1018 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1019}
1020
8ed67789 1021static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1022 struct flowi6 *fl6, int flags)
1da177e4 1023{
4c9483b2 1024 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1025}
1026
9c7a4f9c 1027struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
4c9483b2 1028 struct flowi6 *fl6)
c71099ac
TG		 1029{
1030 int flags = 0;
1031
1fb9489b 1032 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1033
4c9483b2 1034 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
77d16f45 1035 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1036
4c9483b2 1037 if (!ipv6_addr_any(&fl6->saddr))
adaa70bb 1038 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1039 else if (sk)
1040 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1041
4c9483b2 1042 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4
LT		 1043}
1044
7159039a 1045EXPORT_SYMBOL(ip6_route_output);
1da177e4 1046
2774c131 1047struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1048{
5c1e6aa3 1049 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1050 struct dst_entry *new = NULL;
1051
f5b0a874 1052 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1053 if (rt) {
d8d1f30b 1054 new = &rt->dst;
14e50e57 1055
8104891b
SK		 1056 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1057 rt6_init_peer(rt, net->ipv6.peers);
1058
14e50e57 1059 new->__use = 1;
352e512c 1060 new->input = dst_discard;
aad88724 1061 new->output = dst_discard_sk;
14e50e57 1062
21efcfa0
ED		 1063 if (dst_metrics_read_only(&ort->dst))
1064 new->_metrics = ort->dst._metrics;
1065 else
1066 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1067 rt->rt6i_idev = ort->rt6i_idev;
1068 if (rt->rt6i_idev)
1069 in6_dev_hold(rt->rt6i_idev);
14e50e57 1070
4e3fd7a0 1071 rt->rt6i_gateway = ort->rt6i_gateway;
1716a961 1072 rt->rt6i_flags = ort->rt6i_flags;
14e50e57
DM		 1073 rt->rt6i_metric = 0;
1074
1075 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1076#ifdef CONFIG_IPV6_SUBTREES
1077 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1078#endif
1079
1080 dst_free(new);
1081 }
1082
69ead7af
DM		 1083 dst_release(dst_orig);
1084 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1085}
14e50e57 1086
1da177e4
LT		 1087/*
1088 * Destination cache support functions
1089 */
1090
1091static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1092{
1093 struct rt6_info *rt;
1094
1095 rt = (struct rt6_info *) dst;
1096
6f3118b5
ND		 1097 /* All IPV6 dsts are created with ->obsolete set to the value
1098 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1099 * into this function always.
1100 */
ca4c3fc2 1101 if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
6f3118b5
ND		 1102 return NULL;
1103
e3bc10bd
HFS		 1104 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1105 return NULL;
a4477c4d 1106
e3bc10bd
HFS		 1107 if (rt6_check_expired(rt))
1108 return NULL;
1109
1110 return dst;
1da177e4
LT		 1111}
1112
1113static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1114{
1115 struct rt6_info *rt = (struct rt6_info *) dst;
1116
1117 if (rt) {
54c1a859
YH		 1118 if (rt->rt6i_flags & RTF_CACHE) {
1119 if (rt6_check_expired(rt)) {
1120 ip6_del_rt(rt);
1121 dst = NULL;
1122 }
1123 } else {
1da177e4 1124 dst_release(dst);
54c1a859
YH		 1125 dst = NULL;
1126 }
1da177e4 1127 }
54c1a859 1128 return dst;
1da177e4
LT		 1129}
1130
1131static void ip6_link_failure(struct sk_buff *skb)
1132{
1133 struct rt6_info *rt;
1134
3ffe533c 1135 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1136
adf30907 1137 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1138 if (rt) {
1eb4f758
HFS		 1139 if (rt->rt6i_flags & RTF_CACHE) {
1140 dst_hold(&rt->dst);
1141 if (ip6_del_rt(rt))
1142 dst_free(&rt->dst);
1143 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1144 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1145 }
1da177e4
LT		 1146 }
1147}
1148
6700c270
DM		 1149static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1150 struct sk_buff *skb, u32 mtu)
1da177e4
LT		 1151{
1152 struct rt6_info *rt6 = (struct rt6_info*)dst;
1153
81aded24 1154 dst_confirm(dst);
1da177e4 1155 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
81aded24
DM		 1156 struct net *net = dev_net(dst->dev);
1157
1da177e4
LT		 1158 rt6->rt6i_flags |= RTF_MODIFIED;
1159 if (mtu < IPV6_MIN_MTU) {
defb3519 1160 u32 features = dst_metric(dst, RTAX_FEATURES);
1da177e4 1161 mtu = IPV6_MIN_MTU;
defb3519
DM		 1162 features |= RTAX_FEATURE_ALLFRAG;
1163 dst_metric_set(dst, RTAX_FEATURES, features);
1da177e4 1164 }
defb3519 1165 dst_metric_set(dst, RTAX_MTU, mtu);
81aded24 1166 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1da177e4
LT		 1167 }
1168}
1169
42ae66c8
DM		 1170void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1171 int oif, u32 mark)
81aded24
DM		 1172{
1173 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1174 struct dst_entry *dst;
1175 struct flowi6 fl6;
1176
1177 memset(&fl6, 0, sizeof(fl6));
1178 fl6.flowi6_oif = oif;
1179 fl6.flowi6_mark = mark;
81aded24
DM		 1180 fl6.daddr = iph->daddr;
1181 fl6.saddr = iph->saddr;
6502ca52 1182 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1183
1184 dst = ip6_route_output(net, NULL, &fl6);
1185 if (!dst->error)
6700c270 1186 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
81aded24
DM		 1187 dst_release(dst);
1188}
1189EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1190
1191void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1192{
1193 ip6_update_pmtu(skb, sock_net(sk), mtu,
1194 sk->sk_bound_dev_if, sk->sk_mark);
1195}
1196EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1197
b55b76b2
DJ		 1198/* Handle redirects */
1199struct ip6rd_flowi {
1200 struct flowi6 fl6;
1201 struct in6_addr gateway;
1202};
1203
1204static struct rt6_info *__ip6_route_redirect(struct net *net,
1205 struct fib6_table *table,
1206 struct flowi6 *fl6,
1207 int flags)
1208{
1209 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1210 struct rt6_info *rt;
1211 struct fib6_node *fn;
1212
1213 /* Get the "current" route for this destination and
1214 * check if the redirect has come from approriate router.
1215 *
1216 * RFC 4861 specifies that redirects should only be
1217 * accepted if they come from the nexthop to the target.
1218 * Due to the way the routes are chosen, this notion
1219 * is a bit fuzzy and one might need to check all possible
1220 * routes.
1221 */
1222
1223 read_lock_bh(&table->tb6_lock);
1224 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1225restart:
1226 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1227 if (rt6_check_expired(rt))
1228 continue;
1229 if (rt->dst.error)
1230 break;
1231 if (!(rt->rt6i_flags & RTF_GATEWAY))
1232 continue;
1233 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1234 continue;
1235 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1236 continue;
1237 break;
1238 }
1239
1240 if (!rt)
1241 rt = net->ipv6.ip6_null_entry;
1242 else if (rt->dst.error) {
1243 rt = net->ipv6.ip6_null_entry;
1244 goto out;
1245 }
1246 BACKTRACK(net, &fl6->saddr);
1247out:
1248 dst_hold(&rt->dst);
1249
1250 read_unlock_bh(&table->tb6_lock);
1251
1252 return rt;
1253};
1254
1255static struct dst_entry *ip6_route_redirect(struct net *net,
1256 const struct flowi6 *fl6,
1257 const struct in6_addr *gateway)
1258{
1259 int flags = RT6_LOOKUP_F_HAS_SADDR;
1260 struct ip6rd_flowi rdfl;
1261
1262 rdfl.fl6 = *fl6;
1263 rdfl.gateway = *gateway;
1264
1265 return fib6_rule_lookup(net, &rdfl.fl6,
1266 flags, __ip6_route_redirect);
1267}
1268
3a5ad2ee
DM		 1269void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1270{
1271 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1272 struct dst_entry *dst;
1273 struct flowi6 fl6;
1274
1275 memset(&fl6, 0, sizeof(fl6));
1276 fl6.flowi6_oif = oif;
1277 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1278 fl6.daddr = iph->daddr;
1279 fl6.saddr = iph->saddr;
6502ca52 1280 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1281
b55b76b2
DJ		 1282 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1283 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1284 dst_release(dst);
1285}
1286EXPORT_SYMBOL_GPL(ip6_redirect);
1287
c92a59ec
DJ		 1288void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1289 u32 mark)
1290{
1291 const struct ipv6hdr *iph = ipv6_hdr(skb);
1292 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1293 struct dst_entry *dst;
1294 struct flowi6 fl6;
1295
1296 memset(&fl6, 0, sizeof(fl6));
1297 fl6.flowi6_oif = oif;
1298 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1299 fl6.daddr = msg->dest;
1300 fl6.saddr = iph->daddr;
1301
b55b76b2
DJ		 1302 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1303 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1304 dst_release(dst);
1305}
1306
3a5ad2ee
DM		 1307void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1308{
1309 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1310}
1311EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1312
0dbaee3b 1313static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1314{
0dbaee3b
DM		 1315 struct net_device *dev = dst->dev;
1316 unsigned int mtu = dst_mtu(dst);
1317 struct net *net = dev_net(dev);
1318
1da177e4
LT		 1319 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1320
5578689a
DL		 1321 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1322 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1323
1324 /*
1ab1457c
YH		 1325 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1326 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1327 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1328 * rely only on pmtu discovery"
1329 */
1330 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1331 mtu = IPV6_MAXPLEN;
1332 return mtu;
1333}
1334
ebb762f2 1335static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1336{
d33e4553 1337 struct inet6_dev *idev;
618f9bc7
SK		 1338 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1339
1340 if (mtu)
30f78d8e 1341 goto out;
618f9bc7
SK		 1342
1343 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1344
1345 rcu_read_lock();
1346 idev = __in6_dev_get(dst->dev);
1347 if (idev)
1348 mtu = idev->cnf.mtu6;
1349 rcu_read_unlock();
1350
30f78d8e
ED		 1351out:
1352 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1353}
1354
3b00944c
YH		 1355static struct dst_entry *icmp6_dst_gc_list;
1356static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1357
3b00944c 1358struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1359 struct flowi6 *fl6)
1da177e4 1360{
87a11578 1361 struct dst_entry *dst;
1da177e4
LT		 1362 struct rt6_info *rt;
1363 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1364 struct net *net = dev_net(dev);
1da177e4 1365
38308473 1366 if (unlikely(!idev))
122bdf67 1367 return ERR_PTR(-ENODEV);
1da177e4 1368
8b96d22d 1369 rt = ip6_dst_alloc(net, dev, 0, NULL);
38308473 1370 if (unlikely(!rt)) {
1da177e4 1371 in6_dev_put(idev);
87a11578 1372 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1373 goto out;
1374 }
1375
8e2ec639
YZ		 1376 rt->dst.flags |= DST_HOST;
1377 rt->dst.output = ip6_output;
d8d1f30b 1378 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1379 rt->rt6i_gateway = fl6->daddr;
87a11578 1380 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1381 rt->rt6i_dst.plen = 128;
1382 rt->rt6i_idev = idev;
14edd87d 1383 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1384
3b00944c 1385 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1386 rt->dst.next = icmp6_dst_gc_list;
1387 icmp6_dst_gc_list = &rt->dst;
3b00944c 1388 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1389
5578689a 1390 fib6_force_start_gc(net);
1da177e4 1391
87a11578
DM		 1392 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1393
1da177e4 1394out:
87a11578 1395 return dst;
1da177e4
LT		 1396}
1397
3d0f24a7 1398int icmp6_dst_gc(void)
1da177e4 1399{
e9476e95 1400 struct dst_entry *dst, **pprev;
3d0f24a7 1401 int more = 0;
1da177e4 1402
3b00944c
YH		 1403 spin_lock_bh(&icmp6_dst_lock);
1404 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1405
1da177e4
LT		 1406 while ((dst = *pprev) != NULL) {
1407 if (!atomic_read(&dst->__refcnt)) {
1408 *pprev = dst->next;
1409 dst_free(dst);
1da177e4
LT		 1410 } else {
1411 pprev = &dst->next;
3d0f24a7 1412 ++more;
1da177e4
LT		 1413 }
1414 }
1415
3b00944c 1416 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1417
3d0f24a7 1418 return more;
1da177e4
LT		 1419}
1420
1e493d19
DM		 1421static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1422 void *arg)
1423{
1424 struct dst_entry *dst, **pprev;
1425
1426 spin_lock_bh(&icmp6_dst_lock);
1427 pprev = &icmp6_dst_gc_list;
1428 while ((dst = *pprev) != NULL) {
1429 struct rt6_info *rt = (struct rt6_info *) dst;
1430 if (func(rt, arg)) {
1431 *pprev = dst->next;
1432 dst_free(dst);
1433 } else {
1434 pprev = &dst->next;
1435 }
1436 }
1437 spin_unlock_bh(&icmp6_dst_lock);
1438}
1439
569d3645 1440static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1441{
86393e52 1442 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1443 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1444 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1445 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1446 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1447 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1448 int entries;
7019b78e 1449
fc66f95c 1450 entries = dst_entries_get_fast(ops);
49a18d86 1451 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1452 entries <= rt_max_size)
1da177e4
LT		 1453 goto out;
1454
6891a346 1455 net->ipv6.ip6_rt_gc_expire++;
2ac3ac8f 1456 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
fc66f95c
ED		 1457 entries = dst_entries_get_slow(ops);
1458 if (entries < ops->gc_thresh)
7019b78e 1459 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1460out:
7019b78e 1461 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1462 return entries > rt_max_size;
1da177e4
LT		 1463}
1464
1da177e4
LT		 1465/*
1466 *
1467 */
1468
86872cb5 1469int ip6_route_add(struct fib6_config *cfg)
1da177e4
LT		 1470{
1471 int err;
5578689a 1472 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1473 struct rt6_info *rt = NULL;
1474 struct net_device *dev = NULL;
1475 struct inet6_dev *idev = NULL;
c71099ac 1476 struct fib6_table *table;
1da177e4
LT		 1477 int addr_type;
1478
86872cb5 1479 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1da177e4
LT		 1480 return -EINVAL;
1481#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1482 if (cfg->fc_src_len)
1da177e4
LT		 1483 return -EINVAL;
1484#endif
86872cb5 1485 if (cfg->fc_ifindex) {
1da177e4 1486 err = -ENODEV;
5578689a 1487 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1488 if (!dev)
1489 goto out;
1490 idev = in6_dev_get(dev);
1491 if (!idev)
1492 goto out;
1493 }
1494
86872cb5
TG		 1495 if (cfg->fc_metric == 0)
1496 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1497
d71314b4 1498 err = -ENOBUFS;
38308473
DM		 1499 if (cfg->fc_nlinfo.nlh &&
1500 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1501 table = fib6_get_table(net, cfg->fc_table);
38308473 1502 if (!table) {
f3213831 1503 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1504 table = fib6_new_table(net, cfg->fc_table);
1505 }
1506 } else {
1507 table = fib6_new_table(net, cfg->fc_table);
1508 }
38308473
DM		 1509
1510 if (!table)
c71099ac 1511 goto out;
c71099ac 1512
c88507fb 1513 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1da177e4 1514
38308473 1515 if (!rt) {
1da177e4
LT		 1516 err = -ENOMEM;
1517 goto out;
1518 }
1519
1716a961
G		 1520 if (cfg->fc_flags & RTF_EXPIRES)
1521 rt6_set_expires(rt, jiffies +
1522 clock_t_to_jiffies(cfg->fc_expires));
1523 else
1524 rt6_clean_expires(rt);
1da177e4 1525
86872cb5
TG		 1526 if (cfg->fc_protocol == RTPROT_UNSPEC)
1527 cfg->fc_protocol = RTPROT_BOOT;
1528 rt->rt6i_protocol = cfg->fc_protocol;
1529
1530 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1531
1532 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1533 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1534 else if (cfg->fc_flags & RTF_LOCAL)
1535 rt->dst.input = ip6_input;
1da177e4 1536 else
d8d1f30b 1537 rt->dst.input = ip6_forward;
1da177e4 1538
d8d1f30b 1539 rt->dst.output = ip6_output;
1da177e4 1540
86872cb5
TG		 1541 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1542 rt->rt6i_dst.plen = cfg->fc_dst_len;
e5fd387a
MK		 1543 if (rt->rt6i_dst.plen == 128) {
1544 rt->dst.flags |= DST_HOST;
1545 dst_metrics_set_force_overwrite(&rt->dst);
8e2ec639 1546 }
e5fd387a 1547
1da177e4 1548#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1549 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1550 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1551#endif
1552
86872cb5 1553 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1554
1555 /* We cannot add true routes via loopback here,
1556 they would result in kernel looping; promote them to reject routes
1557 */
86872cb5 1558 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1559 (dev && (dev->flags & IFF_LOOPBACK) &&
1560 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1561 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1562 /* hold loopback dev/idev if we haven't done so. */
5578689a 1563 if (dev != net->loopback_dev) {
1da177e4
LT		 1564 if (dev) {
1565 dev_put(dev);
1566 in6_dev_put(idev);
1567 }
5578689a 1568 dev = net->loopback_dev;
1da177e4
LT		 1569 dev_hold(dev);
1570 idev = in6_dev_get(dev);
1571 if (!idev) {
1572 err = -ENODEV;
1573 goto out;
1574 }
1575 }
1da177e4 1576 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1577 switch (cfg->fc_type) {
1578 case RTN_BLACKHOLE:
1579 rt->dst.error = -EINVAL;
aad88724 1580 rt->dst.output = dst_discard_sk;
7150aede 1581 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1582 break;
1583 case RTN_PROHIBIT:
1584 rt->dst.error = -EACCES;
7150aede
K		 1585 rt->dst.output = ip6_pkt_prohibit_out;
1586 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1587 break;
b4949ab2 1588 case RTN_THROW:
ef2c7d7b 1589 default:
7150aede
K		 1590 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1591 : -ENETUNREACH;
1592 rt->dst.output = ip6_pkt_discard_out;
1593 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1594 break;
1595 }
1da177e4
LT		 1596 goto install_route;
1597 }
1598
86872cb5 1599 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1600 const struct in6_addr *gw_addr;
1da177e4
LT		 1601 int gwa_type;
1602
86872cb5 1603 gw_addr = &cfg->fc_gateway;
4e3fd7a0 1604 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1605 gwa_type = ipv6_addr_type(gw_addr);
1606
1607 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1608 struct rt6_info *grt;
1609
1610 /* IPv6 strictly inhibits using not link-local
1611 addresses as nexthop address.
1612 Otherwise, router will not able to send redirects.
1613 It is very good, but in some (rare!) circumstances
1614 (SIT, PtP, NBMA NOARP links) it is handy to allow
1615 some exceptions. --ANK
1616 */
1617 err = -EINVAL;
38308473 1618 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1619 goto out;
1620
5578689a 1621 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1622
1623 err = -EHOSTUNREACH;
38308473 1624 if (!grt)
1da177e4
LT		 1625 goto out;
1626 if (dev) {
d1918542 1627 if (dev != grt->dst.dev) {
94e187c0 1628 ip6_rt_put(grt);
1da177e4
LT		 1629 goto out;
1630 }
1631 } else {
d1918542 1632 dev = grt->dst.dev;
1da177e4
LT		 1633 idev = grt->rt6i_idev;
1634 dev_hold(dev);
1635 in6_dev_hold(grt->rt6i_idev);
1636 }
38308473 1637 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1638 err = 0;
94e187c0 1639 ip6_rt_put(grt);
1da177e4
LT		 1640
1641 if (err)
1642 goto out;
1643 }
1644 err = -EINVAL;
38308473 1645 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1646 goto out;
1647 }
1648
1649 err = -ENODEV;
38308473 1650 if (!dev)
1da177e4
LT		 1651 goto out;
1652
c3968a85
DW		 1653 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1654 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1655 err = -EINVAL;
1656 goto out;
1657 }
4e3fd7a0 1658 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1659 rt->rt6i_prefsrc.plen = 128;
1660 } else
1661 rt->rt6i_prefsrc.plen = 0;
1662
86872cb5 1663 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1664
1665install_route:
d8d1f30b 1666 rt->dst.dev = dev;
1da177e4 1667 rt->rt6i_idev = idev;
c71099ac 1668 rt->rt6i_table = table;
63152fc0 1669
c346dca1 1670 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1671
e5fd387a 1672 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1da177e4
LT		 1673
1674out:
1675 if (dev)
1676 dev_put(dev);
1677 if (idev)
1678 in6_dev_put(idev);
1679 if (rt)
d8d1f30b 1680 dst_free(&rt->dst);
1da177e4
LT		 1681 return err;
1682}
1683
86872cb5 1684static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 1685{
1686 int err;
c71099ac 1687 struct fib6_table *table;
d1918542 1688 struct net *net = dev_net(rt->dst.dev);
1da177e4 1689
6825a26c
G		 1690 if (rt == net->ipv6.ip6_null_entry) {
1691 err = -ENOENT;
1692 goto out;
1693 }
6c813a72 1694
c71099ac
TG		 1695 table = rt->rt6i_table;
1696 write_lock_bh(&table->tb6_lock);
86872cb5 1697 err = fib6_del(rt, info);
c71099ac 1698 write_unlock_bh(&table->tb6_lock);
1da177e4 1699
6825a26c 1700out:
94e187c0 1701 ip6_rt_put(rt);
1da177e4
LT		 1702 return err;
1703}
1704
e0a1ad73
TG		 1705int ip6_del_rt(struct rt6_info *rt)
1706{
4d1169c1 1707 struct nl_info info = {
d1918542 1708 .nl_net = dev_net(rt->dst.dev),
4d1169c1 1709 };
528c4ceb 1710 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 1711}
1712
86872cb5 1713static int ip6_route_del(struct fib6_config *cfg)
1da177e4 1714{
c71099ac 1715 struct fib6_table *table;
1da177e4
LT		 1716 struct fib6_node *fn;
1717 struct rt6_info *rt;
1718 int err = -ESRCH;
1719
5578689a 1720 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 1721 if (!table)
c71099ac
TG		 1722 return err;
1723
1724 read_lock_bh(&table->tb6_lock);
1da177e4 1725
c71099ac 1726 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 1727 &cfg->fc_dst, cfg->fc_dst_len,
1728 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 1729
1da177e4 1730 if (fn) {
d8d1f30b 1731 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
86872cb5 1732 if (cfg->fc_ifindex &&
d1918542
DM		 1733 (!rt->dst.dev ||
1734 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 1735 continue;
86872cb5
TG		 1736 if (cfg->fc_flags & RTF_GATEWAY &&
1737 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 1738 continue;
86872cb5 1739 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 1740 continue;
d8d1f30b 1741 dst_hold(&rt->dst);
c71099ac 1742 read_unlock_bh(&table->tb6_lock);
1da177e4 1743
86872cb5 1744 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 1745 }
1746 }
c71099ac 1747 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1748
1749 return err;
1750}
1751
6700c270 1752static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 1753{
e8599ff4 1754 struct net *net = dev_net(skb->dev);
a6279458 1755 struct netevent_redirect netevent;
e8599ff4 1756 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 1757 struct ndisc_options ndopts;
1758 struct inet6_dev *in6_dev;
1759 struct neighbour *neigh;
71bcdba0 1760 struct rd_msg *msg;
6e157b6a
DM		 1761 int optlen, on_link;
1762 u8 *lladdr;
e8599ff4 1763
29a3cad5 1764 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 1765 optlen -= sizeof(*msg);
e8599ff4
DM		 1766
1767 if (optlen < 0) {
6e157b6a 1768 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 1769 return;
1770 }
1771
71bcdba0 1772 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 1773
71bcdba0 1774 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 1775 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 1776 return;
1777 }
1778
6e157b6a 1779 on_link = 0;
71bcdba0 1780 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 1781 on_link = 1;
71bcdba0 1782 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 1783 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 1784 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 1785 return;
1786 }
1787
1788 in6_dev = __in6_dev_get(skb->dev);
1789 if (!in6_dev)
1790 return;
1791 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1792 return;
1793
1794 /* RFC2461 8.1:
1795 * The IP source address of the Redirect MUST be the same as the current
1796 * first-hop router for the specified ICMP Destination Address.
1797 */
1798
71bcdba0 1799 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 1800 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1801 return;
1802 }
6e157b6a
DM		 1803
1804 lladdr = NULL;
e8599ff4
DM		 1805 if (ndopts.nd_opts_tgt_lladdr) {
1806 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1807 skb->dev);
1808 if (!lladdr) {
1809 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1810 return;
1811 }
1812 }
1813
6e157b6a
DM		 1814 rt = (struct rt6_info *) dst;
1815 if (rt == net->ipv6.ip6_null_entry) {
1816 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 1817 return;
6e157b6a 1818 }
e8599ff4 1819
6e157b6a
DM		 1820 /* Redirect received -> path was valid.
1821 * Look, redirects are sent only in response to data packets,
1822 * so that this nexthop apparently is reachable. --ANK
1823 */
1824 dst_confirm(&rt->dst);
a6279458 1825
71bcdba0 1826 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 1827 if (!neigh)
1828 return;
a6279458 1829
1da177e4
LT		 1830 /*
1831 * We have finally decided to accept it.
1832 */
1833
1ab1457c 1834 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 1835 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1836 NEIGH_UPDATE_F_OVERRIDE|
1837 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1838 NEIGH_UPDATE_F_ISROUTER))
1839 );
1840
71bcdba0 1841 nrt = ip6_rt_copy(rt, &msg->dest);
38308473 1842 if (!nrt)
1da177e4
LT		 1843 goto out;
1844
1845 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1846 if (on_link)
1847 nrt->rt6i_flags &= ~RTF_GATEWAY;
1848
4e3fd7a0 1849 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 1850
40e22e8f 1851 if (ip6_ins_rt(nrt))
1da177e4
LT		 1852 goto out;
1853
d8d1f30b
CG		 1854 netevent.old = &rt->dst;
1855 netevent.new = &nrt->dst;
71bcdba0 1856 netevent.daddr = &msg->dest;
60592833 1857 netevent.neigh = neigh;
8d71740c
TT		 1858 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1859
38308473 1860 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 1861 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 1862 ip6_del_rt(rt);
1da177e4
LT		 1863 }
1864
1865out:
e8599ff4 1866 neigh_release(neigh);
6e157b6a
DM		 1867}
1868
1da177e4
LT		 1869/*
1870 * Misc support functions
1871 */
1872
1716a961 1873static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
21efcfa0 1874 const struct in6_addr *dest)
1da177e4 1875{
d1918542 1876 struct net *net = dev_net(ort->dst.dev);
8b96d22d
DM		 1877 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1878 ort->rt6i_table);
1da177e4
LT		 1879
1880 if (rt) {
d8d1f30b
CG		 1881 rt->dst.input = ort->dst.input;
1882 rt->dst.output = ort->dst.output;
8e2ec639 1883 rt->dst.flags |= DST_HOST;
d8d1f30b 1884
4e3fd7a0 1885 rt->rt6i_dst.addr = *dest;
8e2ec639 1886 rt->rt6i_dst.plen = 128;
defb3519 1887 dst_copy_metrics(&rt->dst, &ort->dst);
d8d1f30b 1888 rt->dst.error = ort->dst.error;
1da177e4
LT		 1889 rt->rt6i_idev = ort->rt6i_idev;
1890 if (rt->rt6i_idev)
1891 in6_dev_hold(rt->rt6i_idev);
d8d1f30b 1892 rt->dst.lastuse = jiffies;
1da177e4 1893
550bab42
JA		 1894 if (ort->rt6i_flags & RTF_GATEWAY)
1895 rt->rt6i_gateway = ort->rt6i_gateway;
1896 else
1897 rt->rt6i_gateway = *dest;
1716a961 1898 rt->rt6i_flags = ort->rt6i_flags;
24f5b855 1899 rt6_set_from(rt, ort);
1da177e4
LT		 1900 rt->rt6i_metric = 0;
1901
1da177e4
LT		 1902#ifdef CONFIG_IPV6_SUBTREES
1903 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1904#endif
0f6c6392 1905 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
c71099ac 1906 rt->rt6i_table = ort->rt6i_table;
1da177e4
LT		 1907 }
1908 return rt;
1909}
1910
70ceb4f5 1911#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 1912static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 1913 const struct in6_addr *prefix, int prefixlen,
1914 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 1915{
1916 struct fib6_node *fn;
1917 struct rt6_info *rt = NULL;
c71099ac
TG		 1918 struct fib6_table *table;
1919
efa2cea0 1920 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 1921 if (!table)
c71099ac 1922 return NULL;
70ceb4f5 1923
5744dd9b 1924 read_lock_bh(&table->tb6_lock);
c71099ac 1925 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
70ceb4f5
YH		 1926 if (!fn)
1927 goto out;
1928
d8d1f30b 1929 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1930 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 1931 continue;
1932 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1933 continue;
1934 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1935 continue;
d8d1f30b 1936 dst_hold(&rt->dst);
70ceb4f5
YH		 1937 break;
1938 }
1939out:
5744dd9b 1940 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 1941 return rt;
1942}
1943
efa2cea0 1944static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 1945 const struct in6_addr *prefix, int prefixlen,
1946 const struct in6_addr *gwaddr, int ifindex,
95c96174 1947 unsigned int pref)
70ceb4f5 1948{
86872cb5
TG		 1949 struct fib6_config cfg = {
1950 .fc_table = RT6_TABLE_INFO,
238fc7ea 1951 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 1952 .fc_ifindex = ifindex,
1953 .fc_dst_len = prefixlen,
1954 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1955 RTF_UP | RTF_PREF(pref),
15e47304 1956 .fc_nlinfo.portid = 0,
efa2cea0
DL		 1957 .fc_nlinfo.nlh = NULL,
1958 .fc_nlinfo.nl_net = net,
86872cb5
TG		 1959 };
1960
4e3fd7a0
AD		 1961 cfg.fc_dst = *prefix;
1962 cfg.fc_gateway = *gwaddr;
70ceb4f5 1963
e317da96
YH		 1964 /* We should treat it as a default route if prefix length is 0. */
1965 if (!prefixlen)
86872cb5 1966 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 1967
86872cb5 1968 ip6_route_add(&cfg);
70ceb4f5 1969
efa2cea0 1970 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 1971}
1972#endif
1973
b71d1d42 1974struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 1975{
1da177e4 1976 struct rt6_info *rt;
c71099ac 1977 struct fib6_table *table;
1da177e4 1978
c346dca1 1979 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 1980 if (!table)
c71099ac 1981 return NULL;
1da177e4 1982
5744dd9b 1983 read_lock_bh(&table->tb6_lock);
d8d1f30b 1984 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
d1918542 1985 if (dev == rt->dst.dev &&
045927ff 1986 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 1987 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1988 break;
1989 }
1990 if (rt)
d8d1f30b 1991 dst_hold(&rt->dst);
5744dd9b 1992 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1993 return rt;
1994}
1995
b71d1d42 1996struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 1997 struct net_device *dev,
1998 unsigned int pref)
1da177e4 1999{
86872cb5
TG		 2000 struct fib6_config cfg = {
2001 .fc_table = RT6_TABLE_DFLT,
238fc7ea 2002 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2003 .fc_ifindex = dev->ifindex,
2004 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2005 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2006 .fc_nlinfo.portid = 0,
5578689a 2007 .fc_nlinfo.nlh = NULL,
c346dca1 2008 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2009 };
1da177e4 2010
4e3fd7a0 2011 cfg.fc_gateway = *gwaddr;
1da177e4 2012
86872cb5 2013 ip6_route_add(&cfg);
1da177e4 2014
1da177e4
LT		 2015 return rt6_get_dflt_router(gwaddr, dev);
2016}
2017
7b4da532 2018void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2019{
2020 struct rt6_info *rt;
c71099ac
TG		 2021 struct fib6_table *table;
2022
2023 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2024 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2025 if (!table)
c71099ac 2026 return;
1da177e4
LT		 2027
2028restart:
c71099ac 2029 read_lock_bh(&table->tb6_lock);
d8d1f30b 2030 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2031 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2032 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2033 dst_hold(&rt->dst);
c71099ac 2034 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2035 ip6_del_rt(rt);
1da177e4
LT		 2036 goto restart;
2037 }
2038 }
c71099ac 2039 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2040}
2041
5578689a
DL		 2042static void rtmsg_to_fib6_config(struct net *net,
2043 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2044 struct fib6_config *cfg)
2045{
2046 memset(cfg, 0, sizeof(*cfg));
2047
2048 cfg->fc_table = RT6_TABLE_MAIN;
2049 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2050 cfg->fc_metric = rtmsg->rtmsg_metric;
2051 cfg->fc_expires = rtmsg->rtmsg_info;
2052 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2053 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2054 cfg->fc_flags = rtmsg->rtmsg_flags;
2055
5578689a 2056 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2057
4e3fd7a0
AD		 2058 cfg->fc_dst = rtmsg->rtmsg_dst;
2059 cfg->fc_src = rtmsg->rtmsg_src;
2060 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2061}
2062
5578689a 2063int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2064{
86872cb5 2065 struct fib6_config cfg;
1da177e4
LT		 2066 struct in6_rtmsg rtmsg;
2067 int err;
2068
2069 switch(cmd) {
2070 case SIOCADDRT: /* Add a route */
2071 case SIOCDELRT: /* Delete a route */
af31f412 2072 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2073 return -EPERM;
2074 err = copy_from_user(&rtmsg, arg,
2075 sizeof(struct in6_rtmsg));
2076 if (err)
2077 return -EFAULT;
86872cb5 2078
5578689a 2079 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2080
1da177e4
LT		 2081 rtnl_lock();
2082 switch (cmd) {
2083 case SIOCADDRT:
86872cb5 2084 err = ip6_route_add(&cfg);
1da177e4
LT		 2085 break;
2086 case SIOCDELRT:
86872cb5 2087 err = ip6_route_del(&cfg);
1da177e4
LT		 2088 break;
2089 default:
2090 err = -EINVAL;
2091 }
2092 rtnl_unlock();
2093
2094 return err;
3ff50b79 2095 }
1da177e4
LT		 2096
2097 return -EINVAL;
2098}
2099
2100/*
2101 * Drop the packet on the floor
2102 */
2103
d5fdd6ba 2104static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2105{
612f09e8 2106 int type;
adf30907 2107 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2108 switch (ipstats_mib_noroutes) {
2109 case IPSTATS_MIB_INNOROUTES:
0660e03f 2110 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2111 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2112 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2113 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2114 break;
2115 }
2116 /* FALLTHROUGH */
2117 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2118 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2119 ipstats_mib_noroutes);
612f09e8
YH		 2120 break;
2121 }
3ffe533c 2122 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2123 kfree_skb(skb);
2124 return 0;
2125}
2126
9ce8ade0
TG		 2127static int ip6_pkt_discard(struct sk_buff *skb)
2128{
612f09e8 2129 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2130}
2131
aad88724 2132static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
1da177e4 2133{
adf30907 2134 skb->dev = skb_dst(skb)->dev;
612f09e8 2135 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2136}
2137
9ce8ade0
TG		 2138static int ip6_pkt_prohibit(struct sk_buff *skb)
2139{
612f09e8 2140 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2141}
2142
aad88724 2143static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
9ce8ade0 2144{
adf30907 2145 skb->dev = skb_dst(skb)->dev;
612f09e8 2146 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2147}
2148
1da177e4
LT		 2149/*
2150 * Allocate a dst for local (unicast / anycast) address.
2151 */
2152
2153struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2154 const struct in6_addr *addr,
8f031519 2155 bool anycast)
1da177e4 2156{
c346dca1 2157 struct net *net = dev_net(idev->dev);
a3300ef4
HFS		 2158 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2159 DST_NOCOUNT, NULL);
2160 if (!rt)
1da177e4
LT		 2161 return ERR_PTR(-ENOMEM);
2162
1da177e4
LT		 2163 in6_dev_hold(idev);
2164
11d53b49 2165 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2166 rt->dst.input = ip6_input;
2167 rt->dst.output = ip6_output;
1da177e4 2168 rt->rt6i_idev = idev;
1da177e4
LT		 2169
2170 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2171 if (anycast)
2172 rt->rt6i_flags |= RTF_ANYCAST;
2173 else
1da177e4 2174 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2175
550bab42 2176 rt->rt6i_gateway = *addr;
4e3fd7a0 2177 rt->rt6i_dst.addr = *addr;
1da177e4 2178 rt->rt6i_dst.plen = 128;
5578689a 2179 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
1da177e4 2180
d8d1f30b 2181 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2182
2183 return rt;
2184}
2185
c3968a85
DW		 2186int ip6_route_get_saddr(struct net *net,
2187 struct rt6_info *rt,
b71d1d42 2188 const struct in6_addr *daddr,
c3968a85
DW		 2189 unsigned int prefs,
2190 struct in6_addr *saddr)
2191{
2192 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2193 int err = 0;
2194 if (rt->rt6i_prefsrc.plen)
4e3fd7a0 2195 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2196 else
2197 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2198 daddr, prefs, saddr);
2199 return err;
2200}
2201
2202/* remove deleted ip from prefsrc entries */
2203struct arg_dev_net_ip {
2204 struct net_device *dev;
2205 struct net *net;
2206 struct in6_addr *addr;
2207};
2208
2209static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2210{
2211 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2212 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2213 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2214
d1918542 2215 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2216 rt != net->ipv6.ip6_null_entry &&
2217 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2218 /* remove prefsrc entry */
2219 rt->rt6i_prefsrc.plen = 0;
2220 }
2221 return 0;
2222}
2223
2224void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2225{
2226 struct net *net = dev_net(ifp->idev->dev);
2227 struct arg_dev_net_ip adni = {
2228 .dev = ifp->idev->dev,
2229 .net = net,
2230 .addr = &ifp->addr,
2231 };
0c3584d5 2232 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2233}
2234
8ed67789
DL		 2235struct arg_dev_net {
2236 struct net_device *dev;
2237 struct net *net;
2238};
2239
1da177e4
LT		 2240static int fib6_ifdown(struct rt6_info *rt, void *arg)
2241{
bc3ef660 2242 const struct arg_dev_net *adn = arg;
2243 const struct net_device *dev = adn->dev;
8ed67789 2244
d1918542 2245 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2246 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2247 return -1;
c159d30c 2248
1da177e4
LT		 2249 return 0;
2250}
2251
f3db4851 2252void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2253{
8ed67789
DL		 2254 struct arg_dev_net adn = {
2255 .dev = dev,
2256 .net = net,
2257 };
2258
0c3584d5 2259 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2260 icmp6_clean_all(fib6_ifdown, &adn);
1da177e4
LT		 2261}
2262
95c96174 2263struct rt6_mtu_change_arg {
1da177e4 2264 struct net_device *dev;
95c96174 2265 unsigned int mtu;
1da177e4
LT		 2266};
2267
2268static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2269{
2270 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2271 struct inet6_dev *idev;
2272
2273 /* In IPv6 pmtu discovery is not optional,
2274 so that RTAX_MTU lock cannot disable it.
2275 We still use this lock to block changes
2276 caused by addrconf/ndisc.
2277 */
2278
2279 idev = __in6_dev_get(arg->dev);
38308473 2280 if (!idev)
1da177e4
LT		 2281 return 0;
2282
2283 /* For administrative MTU increase, there is no way to discover
2284 IPv6 PMTU increase, so PMTU increase should be updated here.
2285 Since RFC 1981 doesn't include administrative MTU increase
2286 update PMTU increase is a MUST. (i.e. jumbo frame)
2287 */
2288 /*
2289 If new MTU is less than route PMTU, this new MTU will be the
2290 lowest MTU in the path, update the route PMTU to reflect PMTU
2291 decreases; if new MTU is greater than route PMTU, and the
2292 old MTU is the lowest MTU in the path, update the route PMTU
2293 to reflect the increase. In this case if the other nodes' MTU
2294 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2295 PMTU discouvery.
2296 */
d1918542 2297 if (rt->dst.dev == arg->dev &&
d8d1f30b
CG		 2298 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2299 (dst_mtu(&rt->dst) >= arg->mtu ||
2300 (dst_mtu(&rt->dst) < arg->mtu &&
2301 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
defb3519 2302 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
566cfd8f 2303 }
1da177e4
LT		 2304 return 0;
2305}
2306
95c96174 2307void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2308{
c71099ac
TG		 2309 struct rt6_mtu_change_arg arg = {
2310 .dev = dev,
2311 .mtu = mtu,
2312 };
1da177e4 2313
0c3584d5 2314 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2315}
2316
ef7c79ed 2317static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2318 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2319 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2320 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2321 [RTA_PRIORITY] = { .type = NLA_U32 },
2322 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2323 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
86872cb5
TG		 2324};
2325
2326static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2327 struct fib6_config *cfg)
1da177e4 2328{
86872cb5
TG		 2329 struct rtmsg *rtm;
2330 struct nlattr *tb[RTA_MAX+1];
2331 int err;
1da177e4 2332
86872cb5
TG		 2333 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2334 if (err < 0)
2335 goto errout;
1da177e4 2336
86872cb5
TG		 2337 err = -EINVAL;
2338 rtm = nlmsg_data(nlh);
2339 memset(cfg, 0, sizeof(*cfg));
2340
2341 cfg->fc_table = rtm->rtm_table;
2342 cfg->fc_dst_len = rtm->rtm_dst_len;
2343 cfg->fc_src_len = rtm->rtm_src_len;
2344 cfg->fc_flags = RTF_UP;
2345 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2346 cfg->fc_type = rtm->rtm_type;
86872cb5 2347
ef2c7d7b
ND		 2348 if (rtm->rtm_type == RTN_UNREACHABLE ||
2349 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2350 rtm->rtm_type == RTN_PROHIBIT ||
2351 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2352 cfg->fc_flags |= RTF_REJECT;
2353
ab79ad14
MŻ		 2354 if (rtm->rtm_type == RTN_LOCAL)
2355 cfg->fc_flags |= RTF_LOCAL;
2356
15e47304 2357 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2358 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2359 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2360
2361 if (tb[RTA_GATEWAY]) {
2362 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2363 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2364 }
86872cb5
TG		 2365
2366 if (tb[RTA_DST]) {
2367 int plen = (rtm->rtm_dst_len + 7) >> 3;
2368
2369 if (nla_len(tb[RTA_DST]) < plen)
2370 goto errout;
2371
2372 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2373 }
86872cb5
TG		 2374
2375 if (tb[RTA_SRC]) {
2376 int plen = (rtm->rtm_src_len + 7) >> 3;
2377
2378 if (nla_len(tb[RTA_SRC]) < plen)
2379 goto errout;
2380
2381 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2382 }
86872cb5 2383
c3968a85
DW		 2384 if (tb[RTA_PREFSRC])
2385 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2386
86872cb5
TG		 2387 if (tb[RTA_OIF])
2388 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2389
2390 if (tb[RTA_PRIORITY])
2391 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2392
2393 if (tb[RTA_METRICS]) {
2394 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2395 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2396 }
86872cb5
TG		 2397
2398 if (tb[RTA_TABLE])
2399 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2400
51ebd318
ND		 2401 if (tb[RTA_MULTIPATH]) {
2402 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2403 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2404 }
2405
86872cb5
TG		 2406 err = 0;
2407errout:
2408 return err;
1da177e4
LT		 2409}
2410
51ebd318
ND		 2411static int ip6_route_multipath(struct fib6_config *cfg, int add)
2412{
2413 struct fib6_config r_cfg;
2414 struct rtnexthop *rtnh;
2415 int remaining;
2416 int attrlen;
2417 int err = 0, last_err = 0;
2418
2419beginning:
2420 rtnh = (struct rtnexthop *)cfg->fc_mp;
2421 remaining = cfg->fc_mp_len;
2422
2423 /* Parse a Multipath Entry */
2424 while (rtnh_ok(rtnh, remaining)) {
2425 memcpy(&r_cfg, cfg, sizeof(*cfg));
2426 if (rtnh->rtnh_ifindex)
2427 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2428
2429 attrlen = rtnh_attrlen(rtnh);
2430 if (attrlen > 0) {
2431 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2432
2433 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2434 if (nla) {
2435 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2436 r_cfg.fc_flags |= RTF_GATEWAY;
2437 }
2438 }
2439 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2440 if (err) {
2441 last_err = err;
2442 /* If we are trying to remove a route, do not stop the
2443 * loop when ip6_route_del() fails (because next hop is
2444 * already gone), we should try to remove all next hops.
2445 */
2446 if (add) {
2447 /* If add fails, we should try to delete all
2448 * next hops that have been already added.
2449 */
2450 add = 0;
2451 goto beginning;
2452 }
2453 }
1a72418b
ND		 2454 /* Because each route is added like a single route we remove
2455 * this flag after the first nexthop (if there is a collision,
2456 * we have already fail to add the first nexthop:
2457 * fib6_add_rt2node() has reject it).
2458 */
2459 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
51ebd318
ND		 2460 rtnh = rtnh_next(rtnh, &remaining);
2461 }
2462
2463 return last_err;
2464}
2465
661d2967 2466static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
1da177e4 2467{
86872cb5
TG		 2468 struct fib6_config cfg;
2469 int err;
1da177e4 2470
86872cb5
TG		 2471 err = rtm_to_fib6_config(skb, nlh, &cfg);
2472 if (err < 0)
2473 return err;
2474
51ebd318
ND		 2475 if (cfg.fc_mp)
2476 return ip6_route_multipath(&cfg, 0);
2477 else
2478 return ip6_route_del(&cfg);
1da177e4
LT		 2479}
2480
661d2967 2481static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
1da177e4 2482{
86872cb5
TG		 2483 struct fib6_config cfg;
2484 int err;
1da177e4 2485
86872cb5
TG		 2486 err = rtm_to_fib6_config(skb, nlh, &cfg);
2487 if (err < 0)
2488 return err;
2489
51ebd318
ND		 2490 if (cfg.fc_mp)
2491 return ip6_route_multipath(&cfg, 1);
2492 else
2493 return ip6_route_add(&cfg);
1da177e4
LT		 2494}
2495
339bf98f
TG		 2496static inline size_t rt6_nlmsg_size(void)
2497{
2498 return NLMSG_ALIGN(sizeof(struct rtmsg))
2499 + nla_total_size(16) /* RTA_SRC */
2500 + nla_total_size(16) /* RTA_DST */
2501 + nla_total_size(16) /* RTA_GATEWAY */
2502 + nla_total_size(16) /* RTA_PREFSRC */
2503 + nla_total_size(4) /* RTA_TABLE */
2504 + nla_total_size(4) /* RTA_IIF */
2505 + nla_total_size(4) /* RTA_OIF */
2506 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 2507 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
339bf98f
TG		 2508 + nla_total_size(sizeof(struct rta_cacheinfo));
2509}
2510
191cd582
BH		 2511static int rt6_fill_node(struct net *net,
2512 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 2513 struct in6_addr *dst, struct in6_addr *src,
15e47304 2514 int iif, int type, u32 portid, u32 seq,
7bc570c8 2515 int prefix, int nowait, unsigned int flags)
1da177e4
LT		 2516{
2517 struct rtmsg *rtm;
2d7202bf 2518 struct nlmsghdr *nlh;
e3703b3d 2519 long expires;
9e762a4a 2520 u32 table;
1da177e4
LT		 2521
2522 if (prefix) { /* user wants prefix routes only */
2523 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2524 /* success since this is not a prefix route */
2525 return 1;
2526 }
2527 }
2528
15e47304 2529 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 2530 if (!nlh)
26932566 2531 return -EMSGSIZE;
2d7202bf
TG		 2532
2533 rtm = nlmsg_data(nlh);
1da177e4
LT		 2534 rtm->rtm_family = AF_INET6;
2535 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2536 rtm->rtm_src_len = rt->rt6i_src.plen;
2537 rtm->rtm_tos = 0;
c71099ac 2538 if (rt->rt6i_table)
9e762a4a 2539 table = rt->rt6i_table->tb6_id;
c71099ac 2540 else
9e762a4a
PM		 2541 table = RT6_TABLE_UNSPEC;
2542 rtm->rtm_table = table;
c78679e8
DM		 2543 if (nla_put_u32(skb, RTA_TABLE, table))
2544 goto nla_put_failure;
ef2c7d7b
ND		 2545 if (rt->rt6i_flags & RTF_REJECT) {
2546 switch (rt->dst.error) {
2547 case -EINVAL:
2548 rtm->rtm_type = RTN_BLACKHOLE;
2549 break;
2550 case -EACCES:
2551 rtm->rtm_type = RTN_PROHIBIT;
2552 break;
b4949ab2
ND		 2553 case -EAGAIN:
2554 rtm->rtm_type = RTN_THROW;
2555 break;
ef2c7d7b
ND		 2556 default:
2557 rtm->rtm_type = RTN_UNREACHABLE;
2558 break;
2559 }
2560 }
38308473 2561 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 2562 rtm->rtm_type = RTN_LOCAL;
d1918542 2563 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2564 rtm->rtm_type = RTN_LOCAL;
2565 else
2566 rtm->rtm_type = RTN_UNICAST;
2567 rtm->rtm_flags = 0;
2568 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2569 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 2570 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 2571 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 2572 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2573 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2574 rtm->rtm_protocol = RTPROT_RA;
2575 else
2576 rtm->rtm_protocol = RTPROT_KERNEL;
2577 }
1da177e4 2578
38308473 2579 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 2580 rtm->rtm_flags |= RTM_F_CLONED;
2581
2582 if (dst) {
c78679e8
DM		 2583 if (nla_put(skb, RTA_DST, 16, dst))
2584 goto nla_put_failure;
1ab1457c 2585 rtm->rtm_dst_len = 128;
1da177e4 2586 } else if (rtm->rtm_dst_len)
c78679e8
DM		 2587 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2588 goto nla_put_failure;
1da177e4
LT		 2589#ifdef CONFIG_IPV6_SUBTREES
2590 if (src) {
c78679e8
DM		 2591 if (nla_put(skb, RTA_SRC, 16, src))
2592 goto nla_put_failure;
1ab1457c 2593 rtm->rtm_src_len = 128;
c78679e8
DM		 2594 } else if (rtm->rtm_src_len &&
2595 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2596 goto nla_put_failure;
1da177e4 2597#endif
7bc570c8
YH		 2598 if (iif) {
2599#ifdef CONFIG_IPV6_MROUTE
2600 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 2601 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 2602 if (err <= 0) {
2603 if (!nowait) {
2604 if (err == 0)
2605 return 0;
2606 goto nla_put_failure;
2607 } else {
2608 if (err == -EMSGSIZE)
2609 goto nla_put_failure;
2610 }
2611 }
2612 } else
2613#endif
c78679e8
DM		 2614 if (nla_put_u32(skb, RTA_IIF, iif))
2615 goto nla_put_failure;
7bc570c8 2616 } else if (dst) {
1da177e4 2617 struct in6_addr saddr_buf;
c78679e8
DM		 2618 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2619 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2620 goto nla_put_failure;
1da177e4 2621 }
2d7202bf 2622
c3968a85
DW		 2623 if (rt->rt6i_prefsrc.plen) {
2624 struct in6_addr saddr_buf;
4e3fd7a0 2625 saddr_buf = rt->rt6i_prefsrc.addr;
c78679e8
DM		 2626 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2627 goto nla_put_failure;
c3968a85
DW		 2628 }
2629
defb3519 2630 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2d7202bf
TG		 2631 goto nla_put_failure;
2632
dd0cbf29
YH		 2633 if (rt->rt6i_flags & RTF_GATEWAY) {
2634 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
94f826b8 2635 goto nla_put_failure;
94f826b8 2636 }
2d7202bf 2637
c78679e8
DM		 2638 if (rt->dst.dev &&
2639 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2640 goto nla_put_failure;
2641 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2642 goto nla_put_failure;
8253947e
LW		 2643
2644 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 2645
87a50699 2646 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 2647 goto nla_put_failure;
2d7202bf
TG		 2648
2649 return nlmsg_end(skb, nlh);
2650
2651nla_put_failure:
26932566
PM		 2652 nlmsg_cancel(skb, nlh);
2653 return -EMSGSIZE;
1da177e4
LT		 2654}
2655
1b43af54 2656int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 2657{
2658 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2659 int prefix;
2660
2d7202bf
TG		 2661 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2662 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 2663 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2664 } else
2665 prefix = 0;
2666
191cd582
BH		 2667 return rt6_fill_node(arg->net,
2668 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 2669 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 2670 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 2671}
2672
661d2967 2673static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
1da177e4 2674{
3b1e0a65 2675 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 2676 struct nlattr *tb[RTA_MAX+1];
2677 struct rt6_info *rt;
1da177e4 2678 struct sk_buff *skb;
ab364a6f 2679 struct rtmsg *rtm;
4c9483b2 2680 struct flowi6 fl6;
72331bc0 2681 int err, iif = 0, oif = 0;
1da177e4 2682
ab364a6f
TG		 2683 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2684 if (err < 0)
2685 goto errout;
1da177e4 2686
ab364a6f 2687 err = -EINVAL;
4c9483b2 2688 memset(&fl6, 0, sizeof(fl6));
1da177e4 2689
ab364a6f
TG		 2690 if (tb[RTA_SRC]) {
2691 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2692 goto errout;
2693
4e3fd7a0 2694 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 2695 }
2696
2697 if (tb[RTA_DST]) {
2698 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2699 goto errout;
2700
4e3fd7a0 2701 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 2702 }
2703
2704 if (tb[RTA_IIF])
2705 iif = nla_get_u32(tb[RTA_IIF]);
2706
2707 if (tb[RTA_OIF])
72331bc0 2708 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4
LT		 2709
2710 if (iif) {
2711 struct net_device *dev;
72331bc0
SL		 2712 int flags = 0;
2713
5578689a 2714 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 2715 if (!dev) {
2716 err = -ENODEV;
ab364a6f 2717 goto errout;
1da177e4 2718 }
72331bc0
SL		 2719
2720 fl6.flowi6_iif = iif;
2721
2722 if (!ipv6_addr_any(&fl6.saddr))
2723 flags |= RT6_LOOKUP_F_HAS_SADDR;
2724
2725 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2726 flags);
2727 } else {
2728 fl6.flowi6_oif = oif;
2729
2730 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 2731 }
2732
ab364a6f 2733 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 2734 if (!skb) {
94e187c0 2735 ip6_rt_put(rt);
ab364a6f
TG		 2736 err = -ENOBUFS;
2737 goto errout;
2738 }
1da177e4 2739
ab364a6f
TG		 2740 /* Reserve room for dummy headers, this skb can pass
2741 through good chunk of routing engine.
2742 */
459a98ed 2743 skb_reset_mac_header(skb);
ab364a6f 2744 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 2745
d8d1f30b 2746 skb_dst_set(skb, &rt->dst);
1da177e4 2747
4c9483b2 2748 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 2749 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 2750 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 2751 if (err < 0) {
ab364a6f
TG		 2752 kfree_skb(skb);
2753 goto errout;
1da177e4
LT		 2754 }
2755
15e47304 2756 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 2757errout:
1da177e4 2758 return err;
1da177e4
LT		 2759}
2760
86872cb5 2761void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2762{
2763 struct sk_buff *skb;
5578689a 2764 struct net *net = info->nl_net;
528c4ceb
DL		 2765 u32 seq;
2766 int err;
2767
2768 err = -ENOBUFS;
38308473 2769 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 2770
339bf98f 2771 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
38308473 2772 if (!skb)
21713ebc
TG		 2773 goto errout;
2774
191cd582 2775 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
15e47304 2776 event, info->portid, seq, 0, 0, 0);
26932566
PM		 2777 if (err < 0) {
2778 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2779 WARN_ON(err == -EMSGSIZE);
2780 kfree_skb(skb);
2781 goto errout;
2782 }
15e47304 2783 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 2784 info->nlh, gfp_any());
2785 return;
21713ebc
TG		 2786errout:
2787 if (err < 0)
5578689a 2788 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 2789}
2790
8ed67789 2791static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 2792 unsigned long event, void *ptr)
8ed67789 2793{
351638e7 2794 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 2795 struct net *net = dev_net(dev);
8ed67789
DL		 2796
2797 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 2798 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 2799 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2800#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 2801 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 2802 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 2803 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 2804 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2805#endif
2806 }
2807
2808 return NOTIFY_OK;
2809}
2810
1da177e4
LT		 2811/*
2812 * /proc
2813 */
2814
2815#ifdef CONFIG_PROC_FS
2816
33120b30
AD		 2817static const struct file_operations ipv6_route_proc_fops = {
2818 .owner = THIS_MODULE,
2819 .open = ipv6_route_open,
2820 .read = seq_read,
2821 .llseek = seq_lseek,
8d2ca1d7 2822 .release = seq_release_net,
33120b30
AD		 2823};
2824
1da177e4
LT		 2825static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2826{
69ddb805 2827 struct net *net = (struct net *)seq->private;
1da177e4 2828 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 2829 net->ipv6.rt6_stats->fib_nodes,
2830 net->ipv6.rt6_stats->fib_route_nodes,
2831 net->ipv6.rt6_stats->fib_rt_alloc,
2832 net->ipv6.rt6_stats->fib_rt_entries,
2833 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 2834 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 2835 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 2836
2837 return 0;
2838}
2839
2840static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2841{
de05c557 2842 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 2843}
2844
9a32144e 2845static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 2846 .owner = THIS_MODULE,
2847 .open = rt6_stats_seq_open,
2848 .read = seq_read,
2849 .llseek = seq_lseek,
b6fcbdb4 2850 .release = single_release_net,
1da177e4
LT		 2851};
2852#endif /* CONFIG_PROC_FS */
2853
2854#ifdef CONFIG_SYSCTL
2855
1da177e4 2856static
fe2c6338 2857int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 2858 void __user *buffer, size_t *lenp, loff_t *ppos)
2859{
c486da34
LAG		 2860 struct net *net;
2861 int delay;
2862 if (!write)
1da177e4 2863 return -EINVAL;
c486da34
LAG		 2864
2865 net = (struct net *)ctl->extra1;
2866 delay = net->ipv6.sysctl.flush_delay;
2867 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 2868 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 2869 return 0;
1da177e4
LT		 2870}
2871
fe2c6338 2872struct ctl_table ipv6_route_table_template[] = {
1ab1457c 2873 {
1da177e4 2874 .procname = "flush",
4990509f 2875 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 2876 .maxlen = sizeof(int),
89c8b3a1 2877 .mode = 0200,
6d9f239a 2878 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 2879 },
2880 {
1da177e4 2881 .procname = "gc_thresh",
9a7ec3a9 2882 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 2883 .maxlen = sizeof(int),
2884 .mode = 0644,
6d9f239a 2885 .proc_handler = proc_dointvec,
1da177e4
LT		 2886 },
2887 {
1da177e4 2888 .procname = "max_size",
4990509f 2889 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 2890 .maxlen = sizeof(int),
2891 .mode = 0644,
6d9f239a 2892 .proc_handler = proc_dointvec,
1da177e4
LT		 2893 },
2894 {
1da177e4 2895 .procname = "gc_min_interval",
4990509f 2896 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 2897 .maxlen = sizeof(int),
2898 .mode = 0644,
6d9f239a 2899 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2900 },
2901 {
1da177e4 2902 .procname = "gc_timeout",
4990509f 2903 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 2904 .maxlen = sizeof(int),
2905 .mode = 0644,
6d9f239a 2906 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2907 },
2908 {
1da177e4 2909 .procname = "gc_interval",
4990509f 2910 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 2911 .maxlen = sizeof(int),
2912 .mode = 0644,
6d9f239a 2913 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2914 },
2915 {
1da177e4 2916 .procname = "gc_elasticity",
4990509f 2917 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 2918 .maxlen = sizeof(int),
2919 .mode = 0644,
f3d3f616 2920 .proc_handler = proc_dointvec,
1da177e4
LT		 2921 },
2922 {
1da177e4 2923 .procname = "mtu_expires",
4990509f 2924 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 2925 .maxlen = sizeof(int),
2926 .mode = 0644,
6d9f239a 2927 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2928 },
2929 {
1da177e4 2930 .procname = "min_adv_mss",
4990509f 2931 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 2932 .maxlen = sizeof(int),
2933 .mode = 0644,
f3d3f616 2934 .proc_handler = proc_dointvec,
1da177e4
LT		 2935 },
2936 {
1da177e4 2937 .procname = "gc_min_interval_ms",
4990509f 2938 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 2939 .maxlen = sizeof(int),
2940 .mode = 0644,
6d9f239a 2941 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 2942 },
f8572d8f 2943 { }
1da177e4
LT		 2944};
2945
2c8c1e72 2946struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 2947{
2948 struct ctl_table *table;
2949
2950 table = kmemdup(ipv6_route_table_template,
2951 sizeof(ipv6_route_table_template),
2952 GFP_KERNEL);
5ee09105
YH		 2953
2954 if (table) {
2955 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 2956 table[0].extra1 = net;
86393e52 2957 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 2958 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2959 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2960 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2961 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2962 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2963 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2964 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 2965 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 2966
2967 /* Don't export sysctls to unprivileged users */
2968 if (net->user_ns != &init_user_ns)
2969 table[0].procname = NULL;
5ee09105
YH		 2970 }
2971
760f2d01
DL		 2972 return table;
2973}
1da177e4
LT		 2974#endif
2975
2c8c1e72 2976static int __net_init ip6_route_net_init(struct net *net)
cdb18761 2977{
633d424b 2978 int ret = -ENOMEM;
8ed67789 2979
86393e52
AD		 2980 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2981 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 2982
fc66f95c
ED		 2983 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2984 goto out_ip6_dst_ops;
2985
8ed67789
DL		 2986 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2987 sizeof(*net->ipv6.ip6_null_entry),
2988 GFP_KERNEL);
2989 if (!net->ipv6.ip6_null_entry)
fc66f95c 2990 goto out_ip6_dst_entries;
d8d1f30b 2991 net->ipv6.ip6_null_entry->dst.path =
8ed67789 2992 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 2993 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 2994 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2995 ip6_template_metrics, true);
8ed67789
DL		 2996
2997#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2998 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2999 sizeof(*net->ipv6.ip6_prohibit_entry),
3000 GFP_KERNEL);
68fffc67
PZ		 3001 if (!net->ipv6.ip6_prohibit_entry)
3002 goto out_ip6_null_entry;
d8d1f30b 3003 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3004 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3005 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3006 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3007 ip6_template_metrics, true);
8ed67789
DL		 3008
3009 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3010 sizeof(*net->ipv6.ip6_blk_hole_entry),
3011 GFP_KERNEL);
68fffc67
PZ		 3012 if (!net->ipv6.ip6_blk_hole_entry)
3013 goto out_ip6_prohibit_entry;
d8d1f30b 3014 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3015 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3016 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3017 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3018 ip6_template_metrics, true);
8ed67789
DL		 3019#endif
3020
b339a47c
PZ		 3021 net->ipv6.sysctl.flush_delay = 0;
3022 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3023 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3024 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3025 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3026 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3027 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3028 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3029
6891a346
BT		 3030 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3031
8ed67789
DL		 3032 ret = 0;
3033out:
3034 return ret;
f2fc6a54 3035
68fffc67
PZ		 3036#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3037out_ip6_prohibit_entry:
3038 kfree(net->ipv6.ip6_prohibit_entry);
3039out_ip6_null_entry:
3040 kfree(net->ipv6.ip6_null_entry);
3041#endif
fc66f95c
ED		 3042out_ip6_dst_entries:
3043 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3044out_ip6_dst_ops:
f2fc6a54 3045 goto out;
cdb18761
DL		 3046}
3047
2c8c1e72 3048static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3049{
8ed67789
DL		 3050 kfree(net->ipv6.ip6_null_entry);
3051#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3052 kfree(net->ipv6.ip6_prohibit_entry);
3053 kfree(net->ipv6.ip6_blk_hole_entry);
3054#endif
41bb78b4 3055 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3056}
3057
d189634e
TG		 3058static int __net_init ip6_route_net_init_late(struct net *net)
3059{
3060#ifdef CONFIG_PROC_FS
d4beaa66
G		 3061 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3062 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3063#endif
3064 return 0;
3065}
3066
3067static void __net_exit ip6_route_net_exit_late(struct net *net)
3068{
3069#ifdef CONFIG_PROC_FS
ece31ffd
G		 3070 remove_proc_entry("ipv6_route", net->proc_net);
3071 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3072#endif
3073}
3074
cdb18761
DL		 3075static struct pernet_operations ip6_route_net_ops = {
3076 .init = ip6_route_net_init,
3077 .exit = ip6_route_net_exit,
3078};
3079
c3426b47
DM		 3080static int __net_init ipv6_inetpeer_init(struct net *net)
3081{
3082 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3083
3084 if (!bp)
3085 return -ENOMEM;
3086 inet_peer_base_init(bp);
3087 net->ipv6.peers = bp;
3088 return 0;
3089}
3090
3091static void __net_exit ipv6_inetpeer_exit(struct net *net)
3092{
3093 struct inet_peer_base *bp = net->ipv6.peers;
3094
3095 net->ipv6.peers = NULL;
56a6b248 3096 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3097 kfree(bp);
3098}
3099
2b823f72 3100static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3101 .init = ipv6_inetpeer_init,
3102 .exit = ipv6_inetpeer_exit,
3103};
3104
d189634e
TG		 3105static struct pernet_operations ip6_route_net_late_ops = {
3106 .init = ip6_route_net_init_late,
3107 .exit = ip6_route_net_exit_late,
3108};
3109
8ed67789
DL		 3110static struct notifier_block ip6_route_dev_notifier = {
3111 .notifier_call = ip6_route_dev_notify,
3112 .priority = 0,
3113};
3114
433d49c3 3115int __init ip6_route_init(void)
1da177e4 3116{
433d49c3
DL		 3117 int ret;
3118
9a7ec3a9
DL		 3119 ret = -ENOMEM;
3120 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3121 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3122 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3123 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3124 goto out;
14e50e57 3125
fc66f95c 3126 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3127 if (ret)
bdb3289f 3128 goto out_kmem_cache;
bdb3289f 3129
c3426b47
DM		 3130 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3131 if (ret)
e8803b6c 3132 goto out_dst_entries;
2a0c451a 3133
7e52b33b
DM		 3134 ret = register_pernet_subsys(&ip6_route_net_ops);
3135 if (ret)
3136 goto out_register_inetpeer;
c3426b47 3137
5dc121e9
AE		 3138 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3139
8ed67789
DL		 3140 /* Registering of the loopback is done before this portion of code,
3141 * the loopback reference in rt6_info will not be taken, do it
3142 * manually for init_net */
d8d1f30b 3143 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3144 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3145 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3146 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3147 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3148 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3149 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3150 #endif
e8803b6c 3151 ret = fib6_init();
433d49c3 3152 if (ret)
8ed67789 3153 goto out_register_subsys;
433d49c3 3154
433d49c3
DL		 3155 ret = xfrm6_init();
3156 if (ret)
e8803b6c 3157 goto out_fib6_init;
c35b7e72 3158
433d49c3
DL		 3159 ret = fib6_rules_init();
3160 if (ret)
3161 goto xfrm6_init;
7e5449c2 3162
d189634e
TG		 3163 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3164 if (ret)
3165 goto fib6_rules_init;
3166
433d49c3 3167 ret = -ENOBUFS;
c7ac8679
GR		 3168 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3169 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3170 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3171 goto out_register_late_subsys;
c127ea2c 3172
8ed67789 3173 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3174 if (ret)
d189634e 3175 goto out_register_late_subsys;
8ed67789 3176
433d49c3
DL		 3177out:
3178 return ret;
3179
d189634e
TG		 3180out_register_late_subsys:
3181 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3182fib6_rules_init:
433d49c3
DL		 3183 fib6_rules_cleanup();
3184xfrm6_init:
433d49c3 3185 xfrm6_fini();
2a0c451a
TG		 3186out_fib6_init:
3187 fib6_gc_cleanup();
8ed67789
DL		 3188out_register_subsys:
3189 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3190out_register_inetpeer:
3191 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3192out_dst_entries:
3193 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3194out_kmem_cache:
f2fc6a54 3195 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3196 goto out;
1da177e4
LT		 3197}
3198
3199void ip6_route_cleanup(void)
3200{
8ed67789 3201 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3202 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3203 fib6_rules_cleanup();
1da177e4 3204 xfrm6_fini();
1da177e4 3205 fib6_gc_cleanup();
c3426b47 3206 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3207 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3208 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3209 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3210}
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