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[linux-2.6-block.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);
87static int ip6_pkt_discard_out(struct sk_buff *skb);
7150aede
K		 88static int ip6_pkt_prohibit(struct sk_buff *skb);
89static int ip6_pkt_prohibit_out(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
CG		 292 .input = dst_discard,
293 .output = dst_discard,
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
HX		 1060 new->input = dst_discard;
1061 new->output = dst_discard;
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)
1341 return mtu;
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
1351 return mtu;
1352}
1353
3b00944c
YH		 1354static struct dst_entry *icmp6_dst_gc_list;
1355static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1356
3b00944c 1357struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1358 struct flowi6 *fl6)
1da177e4 1359{
87a11578 1360 struct dst_entry *dst;
1da177e4
LT		 1361 struct rt6_info *rt;
1362 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1363 struct net *net = dev_net(dev);
1da177e4 1364
38308473 1365 if (unlikely(!idev))
122bdf67 1366 return ERR_PTR(-ENODEV);
1da177e4 1367
8b96d22d 1368 rt = ip6_dst_alloc(net, dev, 0, NULL);
38308473 1369 if (unlikely(!rt)) {
1da177e4 1370 in6_dev_put(idev);
87a11578 1371 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1372 goto out;
1373 }
1374
8e2ec639
YZ		 1375 rt->dst.flags |= DST_HOST;
1376 rt->dst.output = ip6_output;
d8d1f30b 1377 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1378 rt->rt6i_gateway = fl6->daddr;
87a11578 1379 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1380 rt->rt6i_dst.plen = 128;
1381 rt->rt6i_idev = idev;
14edd87d 1382 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1383
3b00944c 1384 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1385 rt->dst.next = icmp6_dst_gc_list;
1386 icmp6_dst_gc_list = &rt->dst;
3b00944c 1387 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1388
5578689a 1389 fib6_force_start_gc(net);
1da177e4 1390
87a11578
DM		 1391 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1392
1da177e4 1393out:
87a11578 1394 return dst;
1da177e4
LT		 1395}
1396
3d0f24a7 1397int icmp6_dst_gc(void)
1da177e4 1398{
e9476e95 1399 struct dst_entry *dst, **pprev;
3d0f24a7 1400 int more = 0;
1da177e4 1401
3b00944c
YH		 1402 spin_lock_bh(&icmp6_dst_lock);
1403 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1404
1da177e4
LT		 1405 while ((dst = *pprev) != NULL) {
1406 if (!atomic_read(&dst->__refcnt)) {
1407 *pprev = dst->next;
1408 dst_free(dst);
1da177e4
LT		 1409 } else {
1410 pprev = &dst->next;
3d0f24a7 1411 ++more;
1da177e4
LT		 1412 }
1413 }
1414
3b00944c 1415 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1416
3d0f24a7 1417 return more;
1da177e4
LT		 1418}
1419
1e493d19
DM		 1420static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1421 void *arg)
1422{
1423 struct dst_entry *dst, **pprev;
1424
1425 spin_lock_bh(&icmp6_dst_lock);
1426 pprev = &icmp6_dst_gc_list;
1427 while ((dst = *pprev) != NULL) {
1428 struct rt6_info *rt = (struct rt6_info *) dst;
1429 if (func(rt, arg)) {
1430 *pprev = dst->next;
1431 dst_free(dst);
1432 } else {
1433 pprev = &dst->next;
1434 }
1435 }
1436 spin_unlock_bh(&icmp6_dst_lock);
1437}
1438
569d3645 1439static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1440{
86393e52 1441 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1442 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1443 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1444 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1445 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1446 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1447 int entries;
7019b78e 1448
fc66f95c 1449 entries = dst_entries_get_fast(ops);
49a18d86 1450 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1451 entries <= rt_max_size)
1da177e4
LT		 1452 goto out;
1453
6891a346 1454 net->ipv6.ip6_rt_gc_expire++;
2ac3ac8f 1455 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
fc66f95c
ED		 1456 entries = dst_entries_get_slow(ops);
1457 if (entries < ops->gc_thresh)
7019b78e 1458 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1459out:
7019b78e 1460 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1461 return entries > rt_max_size;
1da177e4
LT		 1462}
1463
1da177e4
LT		 1464/*
1465 *
1466 */
1467
86872cb5 1468int ip6_route_add(struct fib6_config *cfg)
1da177e4
LT		 1469{
1470 int err;
5578689a 1471 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1472 struct rt6_info *rt = NULL;
1473 struct net_device *dev = NULL;
1474 struct inet6_dev *idev = NULL;
c71099ac 1475 struct fib6_table *table;
1da177e4
LT		 1476 int addr_type;
1477
86872cb5 1478 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1da177e4
LT		 1479 return -EINVAL;
1480#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1481 if (cfg->fc_src_len)
1da177e4
LT		 1482 return -EINVAL;
1483#endif
86872cb5 1484 if (cfg->fc_ifindex) {
1da177e4 1485 err = -ENODEV;
5578689a 1486 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1487 if (!dev)
1488 goto out;
1489 idev = in6_dev_get(dev);
1490 if (!idev)
1491 goto out;
1492 }
1493
86872cb5
TG		 1494 if (cfg->fc_metric == 0)
1495 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1496
d71314b4 1497 err = -ENOBUFS;
38308473
DM		 1498 if (cfg->fc_nlinfo.nlh &&
1499 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1500 table = fib6_get_table(net, cfg->fc_table);
38308473 1501 if (!table) {
f3213831 1502 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1503 table = fib6_new_table(net, cfg->fc_table);
1504 }
1505 } else {
1506 table = fib6_new_table(net, cfg->fc_table);
1507 }
38308473
DM		 1508
1509 if (!table)
c71099ac 1510 goto out;
c71099ac 1511
c88507fb 1512 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1da177e4 1513
38308473 1514 if (!rt) {
1da177e4
LT		 1515 err = -ENOMEM;
1516 goto out;
1517 }
1518
1716a961
G		 1519 if (cfg->fc_flags & RTF_EXPIRES)
1520 rt6_set_expires(rt, jiffies +
1521 clock_t_to_jiffies(cfg->fc_expires));
1522 else
1523 rt6_clean_expires(rt);
1da177e4 1524
86872cb5
TG		 1525 if (cfg->fc_protocol == RTPROT_UNSPEC)
1526 cfg->fc_protocol = RTPROT_BOOT;
1527 rt->rt6i_protocol = cfg->fc_protocol;
1528
1529 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1530
1531 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1532 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1533 else if (cfg->fc_flags & RTF_LOCAL)
1534 rt->dst.input = ip6_input;
1da177e4 1535 else
d8d1f30b 1536 rt->dst.input = ip6_forward;
1da177e4 1537
d8d1f30b 1538 rt->dst.output = ip6_output;
1da177e4 1539
86872cb5
TG		 1540 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1541 rt->rt6i_dst.plen = cfg->fc_dst_len;
e5fd387a
MK		 1542 if (rt->rt6i_dst.plen == 128) {
1543 rt->dst.flags |= DST_HOST;
1544 dst_metrics_set_force_overwrite(&rt->dst);
8e2ec639 1545 }
e5fd387a 1546
1da177e4 1547#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1548 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1549 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1550#endif
1551
86872cb5 1552 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1553
1554 /* We cannot add true routes via loopback here,
1555 they would result in kernel looping; promote them to reject routes
1556 */
86872cb5 1557 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1558 (dev && (dev->flags & IFF_LOOPBACK) &&
1559 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1560 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1561 /* hold loopback dev/idev if we haven't done so. */
5578689a 1562 if (dev != net->loopback_dev) {
1da177e4
LT		 1563 if (dev) {
1564 dev_put(dev);
1565 in6_dev_put(idev);
1566 }
5578689a 1567 dev = net->loopback_dev;
1da177e4
LT		 1568 dev_hold(dev);
1569 idev = in6_dev_get(dev);
1570 if (!idev) {
1571 err = -ENODEV;
1572 goto out;
1573 }
1574 }
1da177e4 1575 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1576 switch (cfg->fc_type) {
1577 case RTN_BLACKHOLE:
1578 rt->dst.error = -EINVAL;
7150aede
K		 1579 rt->dst.output = dst_discard;
1580 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1581 break;
1582 case RTN_PROHIBIT:
1583 rt->dst.error = -EACCES;
7150aede
K		 1584 rt->dst.output = ip6_pkt_prohibit_out;
1585 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1586 break;
b4949ab2 1587 case RTN_THROW:
ef2c7d7b 1588 default:
7150aede
K		 1589 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1590 : -ENETUNREACH;
1591 rt->dst.output = ip6_pkt_discard_out;
1592 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1593 break;
1594 }
1da177e4
LT		 1595 goto install_route;
1596 }
1597
86872cb5 1598 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1599 const struct in6_addr *gw_addr;
1da177e4
LT		 1600 int gwa_type;
1601
86872cb5 1602 gw_addr = &cfg->fc_gateway;
4e3fd7a0 1603 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1604 gwa_type = ipv6_addr_type(gw_addr);
1605
1606 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1607 struct rt6_info *grt;
1608
1609 /* IPv6 strictly inhibits using not link-local
1610 addresses as nexthop address.
1611 Otherwise, router will not able to send redirects.
1612 It is very good, but in some (rare!) circumstances
1613 (SIT, PtP, NBMA NOARP links) it is handy to allow
1614 some exceptions. --ANK
1615 */
1616 err = -EINVAL;
38308473 1617 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1618 goto out;
1619
5578689a 1620 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1621
1622 err = -EHOSTUNREACH;
38308473 1623 if (!grt)
1da177e4
LT		 1624 goto out;
1625 if (dev) {
d1918542 1626 if (dev != grt->dst.dev) {
94e187c0 1627 ip6_rt_put(grt);
1da177e4
LT		 1628 goto out;
1629 }
1630 } else {
d1918542 1631 dev = grt->dst.dev;
1da177e4
LT		 1632 idev = grt->rt6i_idev;
1633 dev_hold(dev);
1634 in6_dev_hold(grt->rt6i_idev);
1635 }
38308473 1636 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1637 err = 0;
94e187c0 1638 ip6_rt_put(grt);
1da177e4
LT		 1639
1640 if (err)
1641 goto out;
1642 }
1643 err = -EINVAL;
38308473 1644 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1645 goto out;
1646 }
1647
1648 err = -ENODEV;
38308473 1649 if (!dev)
1da177e4
LT		 1650 goto out;
1651
c3968a85
DW		 1652 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1653 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1654 err = -EINVAL;
1655 goto out;
1656 }
4e3fd7a0 1657 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1658 rt->rt6i_prefsrc.plen = 128;
1659 } else
1660 rt->rt6i_prefsrc.plen = 0;
1661
86872cb5 1662 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1663
1664install_route:
d8d1f30b 1665 rt->dst.dev = dev;
1da177e4 1666 rt->rt6i_idev = idev;
c71099ac 1667 rt->rt6i_table = table;
63152fc0 1668
c346dca1 1669 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1670
e5fd387a 1671 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1da177e4
LT		 1672
1673out:
1674 if (dev)
1675 dev_put(dev);
1676 if (idev)
1677 in6_dev_put(idev);
1678 if (rt)
d8d1f30b 1679 dst_free(&rt->dst);
1da177e4
LT		 1680 return err;
1681}
1682
86872cb5 1683static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 1684{
1685 int err;
c71099ac 1686 struct fib6_table *table;
d1918542 1687 struct net *net = dev_net(rt->dst.dev);
1da177e4 1688
6825a26c
G		 1689 if (rt == net->ipv6.ip6_null_entry) {
1690 err = -ENOENT;
1691 goto out;
1692 }
6c813a72 1693
c71099ac
TG		 1694 table = rt->rt6i_table;
1695 write_lock_bh(&table->tb6_lock);
86872cb5 1696 err = fib6_del(rt, info);
c71099ac 1697 write_unlock_bh(&table->tb6_lock);
1da177e4 1698
6825a26c 1699out:
94e187c0 1700 ip6_rt_put(rt);
1da177e4
LT		 1701 return err;
1702}
1703
e0a1ad73
TG		 1704int ip6_del_rt(struct rt6_info *rt)
1705{
4d1169c1 1706 struct nl_info info = {
d1918542 1707 .nl_net = dev_net(rt->dst.dev),
4d1169c1 1708 };
528c4ceb 1709 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 1710}
1711
86872cb5 1712static int ip6_route_del(struct fib6_config *cfg)
1da177e4 1713{
c71099ac 1714 struct fib6_table *table;
1da177e4
LT		 1715 struct fib6_node *fn;
1716 struct rt6_info *rt;
1717 int err = -ESRCH;
1718
5578689a 1719 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 1720 if (!table)
c71099ac
TG		 1721 return err;
1722
1723 read_lock_bh(&table->tb6_lock);
1da177e4 1724
c71099ac 1725 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 1726 &cfg->fc_dst, cfg->fc_dst_len,
1727 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 1728
1da177e4 1729 if (fn) {
d8d1f30b 1730 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
86872cb5 1731 if (cfg->fc_ifindex &&
d1918542
DM		 1732 (!rt->dst.dev ||
1733 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 1734 continue;
86872cb5
TG		 1735 if (cfg->fc_flags & RTF_GATEWAY &&
1736 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 1737 continue;
86872cb5 1738 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 1739 continue;
d8d1f30b 1740 dst_hold(&rt->dst);
c71099ac 1741 read_unlock_bh(&table->tb6_lock);
1da177e4 1742
86872cb5 1743 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 1744 }
1745 }
c71099ac 1746 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1747
1748 return err;
1749}
1750
6700c270 1751static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 1752{
e8599ff4 1753 struct net *net = dev_net(skb->dev);
a6279458 1754 struct netevent_redirect netevent;
e8599ff4 1755 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 1756 struct ndisc_options ndopts;
1757 struct inet6_dev *in6_dev;
1758 struct neighbour *neigh;
71bcdba0 1759 struct rd_msg *msg;
6e157b6a
DM		 1760 int optlen, on_link;
1761 u8 *lladdr;
e8599ff4 1762
29a3cad5 1763 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 1764 optlen -= sizeof(*msg);
e8599ff4
DM		 1765
1766 if (optlen < 0) {
6e157b6a 1767 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 1768 return;
1769 }
1770
71bcdba0 1771 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 1772
71bcdba0 1773 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 1774 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 1775 return;
1776 }
1777
6e157b6a 1778 on_link = 0;
71bcdba0 1779 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 1780 on_link = 1;
71bcdba0 1781 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 1782 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 1783 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 1784 return;
1785 }
1786
1787 in6_dev = __in6_dev_get(skb->dev);
1788 if (!in6_dev)
1789 return;
1790 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1791 return;
1792
1793 /* RFC2461 8.1:
1794 * The IP source address of the Redirect MUST be the same as the current
1795 * first-hop router for the specified ICMP Destination Address.
1796 */
1797
71bcdba0 1798 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 1799 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1800 return;
1801 }
6e157b6a
DM		 1802
1803 lladdr = NULL;
e8599ff4
DM		 1804 if (ndopts.nd_opts_tgt_lladdr) {
1805 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1806 skb->dev);
1807 if (!lladdr) {
1808 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1809 return;
1810 }
1811 }
1812
6e157b6a
DM		 1813 rt = (struct rt6_info *) dst;
1814 if (rt == net->ipv6.ip6_null_entry) {
1815 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 1816 return;
6e157b6a 1817 }
e8599ff4 1818
6e157b6a
DM		 1819 /* Redirect received -> path was valid.
1820 * Look, redirects are sent only in response to data packets,
1821 * so that this nexthop apparently is reachable. --ANK
1822 */
1823 dst_confirm(&rt->dst);
a6279458 1824
71bcdba0 1825 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 1826 if (!neigh)
1827 return;
a6279458 1828
1da177e4
LT		 1829 /*
1830 * We have finally decided to accept it.
1831 */
1832
1ab1457c 1833 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 1834 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1835 NEIGH_UPDATE_F_OVERRIDE|
1836 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1837 NEIGH_UPDATE_F_ISROUTER))
1838 );
1839
71bcdba0 1840 nrt = ip6_rt_copy(rt, &msg->dest);
38308473 1841 if (!nrt)
1da177e4
LT		 1842 goto out;
1843
1844 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1845 if (on_link)
1846 nrt->rt6i_flags &= ~RTF_GATEWAY;
1847
4e3fd7a0 1848 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 1849
40e22e8f 1850 if (ip6_ins_rt(nrt))
1da177e4
LT		 1851 goto out;
1852
d8d1f30b
CG		 1853 netevent.old = &rt->dst;
1854 netevent.new = &nrt->dst;
71bcdba0 1855 netevent.daddr = &msg->dest;
60592833 1856 netevent.neigh = neigh;
8d71740c
TT		 1857 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1858
38308473 1859 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 1860 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 1861 ip6_del_rt(rt);
1da177e4
LT		 1862 }
1863
1864out:
e8599ff4 1865 neigh_release(neigh);
6e157b6a
DM		 1866}
1867
1da177e4
LT		 1868/*
1869 * Misc support functions
1870 */
1871
1716a961 1872static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
21efcfa0 1873 const struct in6_addr *dest)
1da177e4 1874{
d1918542 1875 struct net *net = dev_net(ort->dst.dev);
8b96d22d
DM		 1876 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1877 ort->rt6i_table);
1da177e4
LT		 1878
1879 if (rt) {
d8d1f30b
CG		 1880 rt->dst.input = ort->dst.input;
1881 rt->dst.output = ort->dst.output;
8e2ec639 1882 rt->dst.flags |= DST_HOST;
d8d1f30b 1883
4e3fd7a0 1884 rt->rt6i_dst.addr = *dest;
8e2ec639 1885 rt->rt6i_dst.plen = 128;
defb3519 1886 dst_copy_metrics(&rt->dst, &ort->dst);
d8d1f30b 1887 rt->dst.error = ort->dst.error;
1da177e4
LT		 1888 rt->rt6i_idev = ort->rt6i_idev;
1889 if (rt->rt6i_idev)
1890 in6_dev_hold(rt->rt6i_idev);
d8d1f30b 1891 rt->dst.lastuse = jiffies;
1da177e4 1892
550bab42
JA		 1893 if (ort->rt6i_flags & RTF_GATEWAY)
1894 rt->rt6i_gateway = ort->rt6i_gateway;
1895 else
1896 rt->rt6i_gateway = *dest;
1716a961 1897 rt->rt6i_flags = ort->rt6i_flags;
24f5b855 1898 rt6_set_from(rt, ort);
1da177e4
LT		 1899 rt->rt6i_metric = 0;
1900
1da177e4
LT		 1901#ifdef CONFIG_IPV6_SUBTREES
1902 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1903#endif
0f6c6392 1904 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
c71099ac 1905 rt->rt6i_table = ort->rt6i_table;
1da177e4
LT		 1906 }
1907 return rt;
1908}
1909
70ceb4f5 1910#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 1911static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 1912 const struct in6_addr *prefix, int prefixlen,
1913 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 1914{
1915 struct fib6_node *fn;
1916 struct rt6_info *rt = NULL;
c71099ac
TG		 1917 struct fib6_table *table;
1918
efa2cea0 1919 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 1920 if (!table)
c71099ac 1921 return NULL;
70ceb4f5 1922
5744dd9b 1923 read_lock_bh(&table->tb6_lock);
c71099ac 1924 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
70ceb4f5
YH		 1925 if (!fn)
1926 goto out;
1927
d8d1f30b 1928 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1929 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 1930 continue;
1931 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1932 continue;
1933 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1934 continue;
d8d1f30b 1935 dst_hold(&rt->dst);
70ceb4f5
YH		 1936 break;
1937 }
1938out:
5744dd9b 1939 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 1940 return rt;
1941}
1942
efa2cea0 1943static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 1944 const struct in6_addr *prefix, int prefixlen,
1945 const struct in6_addr *gwaddr, int ifindex,
95c96174 1946 unsigned int pref)
70ceb4f5 1947{
86872cb5
TG		 1948 struct fib6_config cfg = {
1949 .fc_table = RT6_TABLE_INFO,
238fc7ea 1950 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 1951 .fc_ifindex = ifindex,
1952 .fc_dst_len = prefixlen,
1953 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1954 RTF_UP | RTF_PREF(pref),
15e47304 1955 .fc_nlinfo.portid = 0,
efa2cea0
DL		 1956 .fc_nlinfo.nlh = NULL,
1957 .fc_nlinfo.nl_net = net,
86872cb5
TG		 1958 };
1959
4e3fd7a0
AD		 1960 cfg.fc_dst = *prefix;
1961 cfg.fc_gateway = *gwaddr;
70ceb4f5 1962
e317da96
YH		 1963 /* We should treat it as a default route if prefix length is 0. */
1964 if (!prefixlen)
86872cb5 1965 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 1966
86872cb5 1967 ip6_route_add(&cfg);
70ceb4f5 1968
efa2cea0 1969 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 1970}
1971#endif
1972
b71d1d42 1973struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 1974{
1da177e4 1975 struct rt6_info *rt;
c71099ac 1976 struct fib6_table *table;
1da177e4 1977
c346dca1 1978 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 1979 if (!table)
c71099ac 1980 return NULL;
1da177e4 1981
5744dd9b 1982 read_lock_bh(&table->tb6_lock);
d8d1f30b 1983 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
d1918542 1984 if (dev == rt->dst.dev &&
045927ff 1985 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 1986 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1987 break;
1988 }
1989 if (rt)
d8d1f30b 1990 dst_hold(&rt->dst);
5744dd9b 1991 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1992 return rt;
1993}
1994
b71d1d42 1995struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 1996 struct net_device *dev,
1997 unsigned int pref)
1da177e4 1998{
86872cb5
TG		 1999 struct fib6_config cfg = {
2000 .fc_table = RT6_TABLE_DFLT,
238fc7ea 2001 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2002 .fc_ifindex = dev->ifindex,
2003 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2004 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2005 .fc_nlinfo.portid = 0,
5578689a 2006 .fc_nlinfo.nlh = NULL,
c346dca1 2007 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2008 };
1da177e4 2009
4e3fd7a0 2010 cfg.fc_gateway = *gwaddr;
1da177e4 2011
86872cb5 2012 ip6_route_add(&cfg);
1da177e4 2013
1da177e4
LT		 2014 return rt6_get_dflt_router(gwaddr, dev);
2015}
2016
7b4da532 2017void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2018{
2019 struct rt6_info *rt;
c71099ac
TG		 2020 struct fib6_table *table;
2021
2022 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2023 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2024 if (!table)
c71099ac 2025 return;
1da177e4
LT		 2026
2027restart:
c71099ac 2028 read_lock_bh(&table->tb6_lock);
d8d1f30b 2029 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2030 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2031 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2032 dst_hold(&rt->dst);
c71099ac 2033 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2034 ip6_del_rt(rt);
1da177e4
LT		 2035 goto restart;
2036 }
2037 }
c71099ac 2038 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2039}
2040
5578689a
DL		 2041static void rtmsg_to_fib6_config(struct net *net,
2042 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2043 struct fib6_config *cfg)
2044{
2045 memset(cfg, 0, sizeof(*cfg));
2046
2047 cfg->fc_table = RT6_TABLE_MAIN;
2048 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2049 cfg->fc_metric = rtmsg->rtmsg_metric;
2050 cfg->fc_expires = rtmsg->rtmsg_info;
2051 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2052 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2053 cfg->fc_flags = rtmsg->rtmsg_flags;
2054
5578689a 2055 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2056
4e3fd7a0
AD		 2057 cfg->fc_dst = rtmsg->rtmsg_dst;
2058 cfg->fc_src = rtmsg->rtmsg_src;
2059 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2060}
2061
5578689a 2062int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2063{
86872cb5 2064 struct fib6_config cfg;
1da177e4
LT		 2065 struct in6_rtmsg rtmsg;
2066 int err;
2067
2068 switch(cmd) {
2069 case SIOCADDRT: /* Add a route */
2070 case SIOCDELRT: /* Delete a route */
af31f412 2071 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2072 return -EPERM;
2073 err = copy_from_user(&rtmsg, arg,
2074 sizeof(struct in6_rtmsg));
2075 if (err)
2076 return -EFAULT;
86872cb5 2077
5578689a 2078 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2079
1da177e4
LT		 2080 rtnl_lock();
2081 switch (cmd) {
2082 case SIOCADDRT:
86872cb5 2083 err = ip6_route_add(&cfg);
1da177e4
LT		 2084 break;
2085 case SIOCDELRT:
86872cb5 2086 err = ip6_route_del(&cfg);
1da177e4
LT		 2087 break;
2088 default:
2089 err = -EINVAL;
2090 }
2091 rtnl_unlock();
2092
2093 return err;
3ff50b79 2094 }
1da177e4
LT		 2095
2096 return -EINVAL;
2097}
2098
2099/*
2100 * Drop the packet on the floor
2101 */
2102
d5fdd6ba 2103static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2104{
612f09e8 2105 int type;
adf30907 2106 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2107 switch (ipstats_mib_noroutes) {
2108 case IPSTATS_MIB_INNOROUTES:
0660e03f 2109 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2110 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2111 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2112 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2113 break;
2114 }
2115 /* FALLTHROUGH */
2116 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2117 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2118 ipstats_mib_noroutes);
612f09e8
YH		 2119 break;
2120 }
3ffe533c 2121 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2122 kfree_skb(skb);
2123 return 0;
2124}
2125
9ce8ade0
TG		 2126static int ip6_pkt_discard(struct sk_buff *skb)
2127{
612f09e8 2128 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2129}
2130
20380731 2131static int ip6_pkt_discard_out(struct sk_buff *skb)
1da177e4 2132{
adf30907 2133 skb->dev = skb_dst(skb)->dev;
612f09e8 2134 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2135}
2136
9ce8ade0
TG		 2137static int ip6_pkt_prohibit(struct sk_buff *skb)
2138{
612f09e8 2139 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2140}
2141
2142static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2143{
adf30907 2144 skb->dev = skb_dst(skb)->dev;
612f09e8 2145 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2146}
2147
1da177e4
LT		 2148/*
2149 * Allocate a dst for local (unicast / anycast) address.
2150 */
2151
2152struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2153 const struct in6_addr *addr,
8f031519 2154 bool anycast)
1da177e4 2155{
c346dca1 2156 struct net *net = dev_net(idev->dev);
a3300ef4
HFS		 2157 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2158 DST_NOCOUNT, NULL);
2159 if (!rt)
1da177e4
LT		 2160 return ERR_PTR(-ENOMEM);
2161
1da177e4
LT		 2162 in6_dev_hold(idev);
2163
11d53b49 2164 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2165 rt->dst.input = ip6_input;
2166 rt->dst.output = ip6_output;
1da177e4 2167 rt->rt6i_idev = idev;
1da177e4
LT		 2168
2169 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2170 if (anycast)
2171 rt->rt6i_flags |= RTF_ANYCAST;
2172 else
1da177e4 2173 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2174
550bab42 2175 rt->rt6i_gateway = *addr;
4e3fd7a0 2176 rt->rt6i_dst.addr = *addr;
1da177e4 2177 rt->rt6i_dst.plen = 128;
5578689a 2178 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
1da177e4 2179
d8d1f30b 2180 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2181
2182 return rt;
2183}
2184
c3968a85
DW		 2185int ip6_route_get_saddr(struct net *net,
2186 struct rt6_info *rt,
b71d1d42 2187 const struct in6_addr *daddr,
c3968a85
DW		 2188 unsigned int prefs,
2189 struct in6_addr *saddr)
2190{
2191 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2192 int err = 0;
2193 if (rt->rt6i_prefsrc.plen)
4e3fd7a0 2194 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2195 else
2196 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2197 daddr, prefs, saddr);
2198 return err;
2199}
2200
2201/* remove deleted ip from prefsrc entries */
2202struct arg_dev_net_ip {
2203 struct net_device *dev;
2204 struct net *net;
2205 struct in6_addr *addr;
2206};
2207
2208static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2209{
2210 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2211 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2212 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2213
d1918542 2214 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2215 rt != net->ipv6.ip6_null_entry &&
2216 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2217 /* remove prefsrc entry */
2218 rt->rt6i_prefsrc.plen = 0;
2219 }
2220 return 0;
2221}
2222
2223void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2224{
2225 struct net *net = dev_net(ifp->idev->dev);
2226 struct arg_dev_net_ip adni = {
2227 .dev = ifp->idev->dev,
2228 .net = net,
2229 .addr = &ifp->addr,
2230 };
0c3584d5 2231 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2232}
2233
8ed67789
DL		 2234struct arg_dev_net {
2235 struct net_device *dev;
2236 struct net *net;
2237};
2238
1da177e4
LT		 2239static int fib6_ifdown(struct rt6_info *rt, void *arg)
2240{
bc3ef660 2241 const struct arg_dev_net *adn = arg;
2242 const struct net_device *dev = adn->dev;
8ed67789 2243
d1918542 2244 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2245 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2246 return -1;
c159d30c 2247
1da177e4
LT		 2248 return 0;
2249}
2250
f3db4851 2251void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2252{
8ed67789
DL		 2253 struct arg_dev_net adn = {
2254 .dev = dev,
2255 .net = net,
2256 };
2257
0c3584d5 2258 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2259 icmp6_clean_all(fib6_ifdown, &adn);
1da177e4
LT		 2260}
2261
95c96174 2262struct rt6_mtu_change_arg {
1da177e4 2263 struct net_device *dev;
95c96174 2264 unsigned int mtu;
1da177e4
LT		 2265};
2266
2267static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2268{
2269 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2270 struct inet6_dev *idev;
2271
2272 /* In IPv6 pmtu discovery is not optional,
2273 so that RTAX_MTU lock cannot disable it.
2274 We still use this lock to block changes
2275 caused by addrconf/ndisc.
2276 */
2277
2278 idev = __in6_dev_get(arg->dev);
38308473 2279 if (!idev)
1da177e4
LT		 2280 return 0;
2281
2282 /* For administrative MTU increase, there is no way to discover
2283 IPv6 PMTU increase, so PMTU increase should be updated here.
2284 Since RFC 1981 doesn't include administrative MTU increase
2285 update PMTU increase is a MUST. (i.e. jumbo frame)
2286 */
2287 /*
2288 If new MTU is less than route PMTU, this new MTU will be the
2289 lowest MTU in the path, update the route PMTU to reflect PMTU
2290 decreases; if new MTU is greater than route PMTU, and the
2291 old MTU is the lowest MTU in the path, update the route PMTU
2292 to reflect the increase. In this case if the other nodes' MTU
2293 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2294 PMTU discouvery.
2295 */
d1918542 2296 if (rt->dst.dev == arg->dev &&
d8d1f30b
CG		 2297 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2298 (dst_mtu(&rt->dst) >= arg->mtu ||
2299 (dst_mtu(&rt->dst) < arg->mtu &&
2300 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
defb3519 2301 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
566cfd8f 2302 }
1da177e4
LT		 2303 return 0;
2304}
2305
95c96174 2306void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2307{
c71099ac
TG		 2308 struct rt6_mtu_change_arg arg = {
2309 .dev = dev,
2310 .mtu = mtu,
2311 };
1da177e4 2312
0c3584d5 2313 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2314}
2315
ef7c79ed 2316static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2317 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2318 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2319 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2320 [RTA_PRIORITY] = { .type = NLA_U32 },
2321 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2322 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
86872cb5
TG		 2323};
2324
2325static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2326 struct fib6_config *cfg)
1da177e4 2327{
86872cb5
TG		 2328 struct rtmsg *rtm;
2329 struct nlattr *tb[RTA_MAX+1];
2330 int err;
1da177e4 2331
86872cb5
TG		 2332 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2333 if (err < 0)
2334 goto errout;
1da177e4 2335
86872cb5
TG		 2336 err = -EINVAL;
2337 rtm = nlmsg_data(nlh);
2338 memset(cfg, 0, sizeof(*cfg));
2339
2340 cfg->fc_table = rtm->rtm_table;
2341 cfg->fc_dst_len = rtm->rtm_dst_len;
2342 cfg->fc_src_len = rtm->rtm_src_len;
2343 cfg->fc_flags = RTF_UP;
2344 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2345 cfg->fc_type = rtm->rtm_type;
86872cb5 2346
ef2c7d7b
ND		 2347 if (rtm->rtm_type == RTN_UNREACHABLE ||
2348 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2349 rtm->rtm_type == RTN_PROHIBIT ||
2350 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2351 cfg->fc_flags |= RTF_REJECT;
2352
ab79ad14
MŻ		 2353 if (rtm->rtm_type == RTN_LOCAL)
2354 cfg->fc_flags |= RTF_LOCAL;
2355
15e47304 2356 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2357 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2358 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2359
2360 if (tb[RTA_GATEWAY]) {
2361 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2362 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2363 }
86872cb5
TG		 2364
2365 if (tb[RTA_DST]) {
2366 int plen = (rtm->rtm_dst_len + 7) >> 3;
2367
2368 if (nla_len(tb[RTA_DST]) < plen)
2369 goto errout;
2370
2371 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2372 }
86872cb5
TG		 2373
2374 if (tb[RTA_SRC]) {
2375 int plen = (rtm->rtm_src_len + 7) >> 3;
2376
2377 if (nla_len(tb[RTA_SRC]) < plen)
2378 goto errout;
2379
2380 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2381 }
86872cb5 2382
c3968a85
DW		 2383 if (tb[RTA_PREFSRC])
2384 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2385
86872cb5
TG		 2386 if (tb[RTA_OIF])
2387 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2388
2389 if (tb[RTA_PRIORITY])
2390 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2391
2392 if (tb[RTA_METRICS]) {
2393 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2394 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2395 }
86872cb5
TG		 2396
2397 if (tb[RTA_TABLE])
2398 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2399
51ebd318
ND		 2400 if (tb[RTA_MULTIPATH]) {
2401 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2402 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2403 }
2404
86872cb5
TG		 2405 err = 0;
2406errout:
2407 return err;
1da177e4
LT		 2408}
2409
51ebd318
ND		 2410static int ip6_route_multipath(struct fib6_config *cfg, int add)
2411{
2412 struct fib6_config r_cfg;
2413 struct rtnexthop *rtnh;
2414 int remaining;
2415 int attrlen;
2416 int err = 0, last_err = 0;
2417
2418beginning:
2419 rtnh = (struct rtnexthop *)cfg->fc_mp;
2420 remaining = cfg->fc_mp_len;
2421
2422 /* Parse a Multipath Entry */
2423 while (rtnh_ok(rtnh, remaining)) {
2424 memcpy(&r_cfg, cfg, sizeof(*cfg));
2425 if (rtnh->rtnh_ifindex)
2426 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2427
2428 attrlen = rtnh_attrlen(rtnh);
2429 if (attrlen > 0) {
2430 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2431
2432 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2433 if (nla) {
2434 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2435 r_cfg.fc_flags |= RTF_GATEWAY;
2436 }
2437 }
2438 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2439 if (err) {
2440 last_err = err;
2441 /* If we are trying to remove a route, do not stop the
2442 * loop when ip6_route_del() fails (because next hop is
2443 * already gone), we should try to remove all next hops.
2444 */
2445 if (add) {
2446 /* If add fails, we should try to delete all
2447 * next hops that have been already added.
2448 */
2449 add = 0;
2450 goto beginning;
2451 }
2452 }
1a72418b
ND		 2453 /* Because each route is added like a single route we remove
2454 * this flag after the first nexthop (if there is a collision,
2455 * we have already fail to add the first nexthop:
2456 * fib6_add_rt2node() has reject it).
2457 */
2458 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
51ebd318
ND		 2459 rtnh = rtnh_next(rtnh, &remaining);
2460 }
2461
2462 return last_err;
2463}
2464
661d2967 2465static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
1da177e4 2466{
86872cb5
TG		 2467 struct fib6_config cfg;
2468 int err;
1da177e4 2469
86872cb5
TG		 2470 err = rtm_to_fib6_config(skb, nlh, &cfg);
2471 if (err < 0)
2472 return err;
2473
51ebd318
ND		 2474 if (cfg.fc_mp)
2475 return ip6_route_multipath(&cfg, 0);
2476 else
2477 return ip6_route_del(&cfg);
1da177e4
LT		 2478}
2479
661d2967 2480static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
1da177e4 2481{
86872cb5
TG		 2482 struct fib6_config cfg;
2483 int err;
1da177e4 2484
86872cb5
TG		 2485 err = rtm_to_fib6_config(skb, nlh, &cfg);
2486 if (err < 0)
2487 return err;
2488
51ebd318
ND		 2489 if (cfg.fc_mp)
2490 return ip6_route_multipath(&cfg, 1);
2491 else
2492 return ip6_route_add(&cfg);
1da177e4
LT		 2493}
2494
339bf98f
TG		 2495static inline size_t rt6_nlmsg_size(void)
2496{
2497 return NLMSG_ALIGN(sizeof(struct rtmsg))
2498 + nla_total_size(16) /* RTA_SRC */
2499 + nla_total_size(16) /* RTA_DST */
2500 + nla_total_size(16) /* RTA_GATEWAY */
2501 + nla_total_size(16) /* RTA_PREFSRC */
2502 + nla_total_size(4) /* RTA_TABLE */
2503 + nla_total_size(4) /* RTA_IIF */
2504 + nla_total_size(4) /* RTA_OIF */
2505 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 2506 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
339bf98f
TG		 2507 + nla_total_size(sizeof(struct rta_cacheinfo));
2508}
2509
191cd582
BH		 2510static int rt6_fill_node(struct net *net,
2511 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 2512 struct in6_addr *dst, struct in6_addr *src,
15e47304 2513 int iif, int type, u32 portid, u32 seq,
7bc570c8 2514 int prefix, int nowait, unsigned int flags)
1da177e4
LT		 2515{
2516 struct rtmsg *rtm;
2d7202bf 2517 struct nlmsghdr *nlh;
e3703b3d 2518 long expires;
9e762a4a 2519 u32 table;
1da177e4
LT		 2520
2521 if (prefix) { /* user wants prefix routes only */
2522 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2523 /* success since this is not a prefix route */
2524 return 1;
2525 }
2526 }
2527
15e47304 2528 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 2529 if (!nlh)
26932566 2530 return -EMSGSIZE;
2d7202bf
TG		 2531
2532 rtm = nlmsg_data(nlh);
1da177e4
LT		 2533 rtm->rtm_family = AF_INET6;
2534 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2535 rtm->rtm_src_len = rt->rt6i_src.plen;
2536 rtm->rtm_tos = 0;
c71099ac 2537 if (rt->rt6i_table)
9e762a4a 2538 table = rt->rt6i_table->tb6_id;
c71099ac 2539 else
9e762a4a
PM		 2540 table = RT6_TABLE_UNSPEC;
2541 rtm->rtm_table = table;
c78679e8
DM		 2542 if (nla_put_u32(skb, RTA_TABLE, table))
2543 goto nla_put_failure;
ef2c7d7b
ND		 2544 if (rt->rt6i_flags & RTF_REJECT) {
2545 switch (rt->dst.error) {
2546 case -EINVAL:
2547 rtm->rtm_type = RTN_BLACKHOLE;
2548 break;
2549 case -EACCES:
2550 rtm->rtm_type = RTN_PROHIBIT;
2551 break;
b4949ab2
ND		 2552 case -EAGAIN:
2553 rtm->rtm_type = RTN_THROW;
2554 break;
ef2c7d7b
ND		 2555 default:
2556 rtm->rtm_type = RTN_UNREACHABLE;
2557 break;
2558 }
2559 }
38308473 2560 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 2561 rtm->rtm_type = RTN_LOCAL;
d1918542 2562 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2563 rtm->rtm_type = RTN_LOCAL;
2564 else
2565 rtm->rtm_type = RTN_UNICAST;
2566 rtm->rtm_flags = 0;
2567 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2568 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 2569 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 2570 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 2571 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2572 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2573 rtm->rtm_protocol = RTPROT_RA;
2574 else
2575 rtm->rtm_protocol = RTPROT_KERNEL;
2576 }
1da177e4 2577
38308473 2578 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 2579 rtm->rtm_flags |= RTM_F_CLONED;
2580
2581 if (dst) {
c78679e8
DM		 2582 if (nla_put(skb, RTA_DST, 16, dst))
2583 goto nla_put_failure;
1ab1457c 2584 rtm->rtm_dst_len = 128;
1da177e4 2585 } else if (rtm->rtm_dst_len)
c78679e8
DM		 2586 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2587 goto nla_put_failure;
1da177e4
LT		 2588#ifdef CONFIG_IPV6_SUBTREES
2589 if (src) {
c78679e8
DM		 2590 if (nla_put(skb, RTA_SRC, 16, src))
2591 goto nla_put_failure;
1ab1457c 2592 rtm->rtm_src_len = 128;
c78679e8
DM		 2593 } else if (rtm->rtm_src_len &&
2594 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2595 goto nla_put_failure;
1da177e4 2596#endif
7bc570c8
YH		 2597 if (iif) {
2598#ifdef CONFIG_IPV6_MROUTE
2599 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 2600 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 2601 if (err <= 0) {
2602 if (!nowait) {
2603 if (err == 0)
2604 return 0;
2605 goto nla_put_failure;
2606 } else {
2607 if (err == -EMSGSIZE)
2608 goto nla_put_failure;
2609 }
2610 }
2611 } else
2612#endif
c78679e8
DM		 2613 if (nla_put_u32(skb, RTA_IIF, iif))
2614 goto nla_put_failure;
7bc570c8 2615 } else if (dst) {
1da177e4 2616 struct in6_addr saddr_buf;
c78679e8
DM		 2617 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2618 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2619 goto nla_put_failure;
1da177e4 2620 }
2d7202bf 2621
c3968a85
DW		 2622 if (rt->rt6i_prefsrc.plen) {
2623 struct in6_addr saddr_buf;
4e3fd7a0 2624 saddr_buf = rt->rt6i_prefsrc.addr;
c78679e8
DM		 2625 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2626 goto nla_put_failure;
c3968a85
DW		 2627 }
2628
defb3519 2629 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2d7202bf
TG		 2630 goto nla_put_failure;
2631
dd0cbf29
YH		 2632 if (rt->rt6i_flags & RTF_GATEWAY) {
2633 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
94f826b8 2634 goto nla_put_failure;
94f826b8 2635 }
2d7202bf 2636
c78679e8
DM		 2637 if (rt->dst.dev &&
2638 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2639 goto nla_put_failure;
2640 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2641 goto nla_put_failure;
8253947e
LW		 2642
2643 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 2644
87a50699 2645 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 2646 goto nla_put_failure;
2d7202bf
TG		 2647
2648 return nlmsg_end(skb, nlh);
2649
2650nla_put_failure:
26932566
PM		 2651 nlmsg_cancel(skb, nlh);
2652 return -EMSGSIZE;
1da177e4
LT		 2653}
2654
1b43af54 2655int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 2656{
2657 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2658 int prefix;
2659
2d7202bf
TG		 2660 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2661 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 2662 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2663 } else
2664 prefix = 0;
2665
191cd582
BH		 2666 return rt6_fill_node(arg->net,
2667 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 2668 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 2669 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 2670}
2671
661d2967 2672static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
1da177e4 2673{
3b1e0a65 2674 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 2675 struct nlattr *tb[RTA_MAX+1];
2676 struct rt6_info *rt;
1da177e4 2677 struct sk_buff *skb;
ab364a6f 2678 struct rtmsg *rtm;
4c9483b2 2679 struct flowi6 fl6;
72331bc0 2680 int err, iif = 0, oif = 0;
1da177e4 2681
ab364a6f
TG		 2682 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2683 if (err < 0)
2684 goto errout;
1da177e4 2685
ab364a6f 2686 err = -EINVAL;
4c9483b2 2687 memset(&fl6, 0, sizeof(fl6));
1da177e4 2688
ab364a6f
TG		 2689 if (tb[RTA_SRC]) {
2690 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2691 goto errout;
2692
4e3fd7a0 2693 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 2694 }
2695
2696 if (tb[RTA_DST]) {
2697 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2698 goto errout;
2699
4e3fd7a0 2700 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 2701 }
2702
2703 if (tb[RTA_IIF])
2704 iif = nla_get_u32(tb[RTA_IIF]);
2705
2706 if (tb[RTA_OIF])
72331bc0 2707 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4
LT		 2708
2709 if (iif) {
2710 struct net_device *dev;
72331bc0
SL		 2711 int flags = 0;
2712
5578689a 2713 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 2714 if (!dev) {
2715 err = -ENODEV;
ab364a6f 2716 goto errout;
1da177e4 2717 }
72331bc0
SL		 2718
2719 fl6.flowi6_iif = iif;
2720
2721 if (!ipv6_addr_any(&fl6.saddr))
2722 flags |= RT6_LOOKUP_F_HAS_SADDR;
2723
2724 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2725 flags);
2726 } else {
2727 fl6.flowi6_oif = oif;
2728
2729 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 2730 }
2731
ab364a6f 2732 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 2733 if (!skb) {
94e187c0 2734 ip6_rt_put(rt);
ab364a6f
TG		 2735 err = -ENOBUFS;
2736 goto errout;
2737 }
1da177e4 2738
ab364a6f
TG		 2739 /* Reserve room for dummy headers, this skb can pass
2740 through good chunk of routing engine.
2741 */
459a98ed 2742 skb_reset_mac_header(skb);
ab364a6f 2743 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 2744
d8d1f30b 2745 skb_dst_set(skb, &rt->dst);
1da177e4 2746
4c9483b2 2747 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 2748 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 2749 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 2750 if (err < 0) {
ab364a6f
TG		 2751 kfree_skb(skb);
2752 goto errout;
1da177e4
LT		 2753 }
2754
15e47304 2755 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 2756errout:
1da177e4 2757 return err;
1da177e4
LT		 2758}
2759
86872cb5 2760void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2761{
2762 struct sk_buff *skb;
5578689a 2763 struct net *net = info->nl_net;
528c4ceb
DL		 2764 u32 seq;
2765 int err;
2766
2767 err = -ENOBUFS;
38308473 2768 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 2769
339bf98f 2770 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
38308473 2771 if (!skb)
21713ebc
TG		 2772 goto errout;
2773
191cd582 2774 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
15e47304 2775 event, info->portid, seq, 0, 0, 0);
26932566
PM		 2776 if (err < 0) {
2777 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2778 WARN_ON(err == -EMSGSIZE);
2779 kfree_skb(skb);
2780 goto errout;
2781 }
15e47304 2782 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 2783 info->nlh, gfp_any());
2784 return;
21713ebc
TG		 2785errout:
2786 if (err < 0)
5578689a 2787 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 2788}
2789
8ed67789 2790static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 2791 unsigned long event, void *ptr)
8ed67789 2792{
351638e7 2793 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 2794 struct net *net = dev_net(dev);
8ed67789
DL		 2795
2796 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 2797 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 2798 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2799#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 2800 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 2801 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 2802 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 2803 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2804#endif
2805 }
2806
2807 return NOTIFY_OK;
2808}
2809
1da177e4
LT		 2810/*
2811 * /proc
2812 */
2813
2814#ifdef CONFIG_PROC_FS
2815
33120b30
AD		 2816static const struct file_operations ipv6_route_proc_fops = {
2817 .owner = THIS_MODULE,
2818 .open = ipv6_route_open,
2819 .read = seq_read,
2820 .llseek = seq_lseek,
8d2ca1d7 2821 .release = seq_release_net,
33120b30
AD		 2822};
2823
1da177e4
LT		 2824static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2825{
69ddb805 2826 struct net *net = (struct net *)seq->private;
1da177e4 2827 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 2828 net->ipv6.rt6_stats->fib_nodes,
2829 net->ipv6.rt6_stats->fib_route_nodes,
2830 net->ipv6.rt6_stats->fib_rt_alloc,
2831 net->ipv6.rt6_stats->fib_rt_entries,
2832 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 2833 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 2834 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 2835
2836 return 0;
2837}
2838
2839static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2840{
de05c557 2841 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 2842}
2843
9a32144e 2844static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 2845 .owner = THIS_MODULE,
2846 .open = rt6_stats_seq_open,
2847 .read = seq_read,
2848 .llseek = seq_lseek,
b6fcbdb4 2849 .release = single_release_net,
1da177e4
LT		 2850};
2851#endif /* CONFIG_PROC_FS */
2852
2853#ifdef CONFIG_SYSCTL
2854
1da177e4 2855static
fe2c6338 2856int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 2857 void __user *buffer, size_t *lenp, loff_t *ppos)
2858{
c486da34
LAG		 2859 struct net *net;
2860 int delay;
2861 if (!write)
1da177e4 2862 return -EINVAL;
c486da34
LAG		 2863
2864 net = (struct net *)ctl->extra1;
2865 delay = net->ipv6.sysctl.flush_delay;
2866 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 2867 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 2868 return 0;
1da177e4
LT		 2869}
2870
fe2c6338 2871struct ctl_table ipv6_route_table_template[] = {
1ab1457c 2872 {
1da177e4 2873 .procname = "flush",
4990509f 2874 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 2875 .maxlen = sizeof(int),
89c8b3a1 2876 .mode = 0200,
6d9f239a 2877 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 2878 },
2879 {
1da177e4 2880 .procname = "gc_thresh",
9a7ec3a9 2881 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 2882 .maxlen = sizeof(int),
2883 .mode = 0644,
6d9f239a 2884 .proc_handler = proc_dointvec,
1da177e4
LT		 2885 },
2886 {
1da177e4 2887 .procname = "max_size",
4990509f 2888 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 2889 .maxlen = sizeof(int),
2890 .mode = 0644,
6d9f239a 2891 .proc_handler = proc_dointvec,
1da177e4
LT		 2892 },
2893 {
1da177e4 2894 .procname = "gc_min_interval",
4990509f 2895 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 2896 .maxlen = sizeof(int),
2897 .mode = 0644,
6d9f239a 2898 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2899 },
2900 {
1da177e4 2901 .procname = "gc_timeout",
4990509f 2902 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 2903 .maxlen = sizeof(int),
2904 .mode = 0644,
6d9f239a 2905 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2906 },
2907 {
1da177e4 2908 .procname = "gc_interval",
4990509f 2909 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 2910 .maxlen = sizeof(int),
2911 .mode = 0644,
6d9f239a 2912 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2913 },
2914 {
1da177e4 2915 .procname = "gc_elasticity",
4990509f 2916 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 2917 .maxlen = sizeof(int),
2918 .mode = 0644,
f3d3f616 2919 .proc_handler = proc_dointvec,
1da177e4
LT		 2920 },
2921 {
1da177e4 2922 .procname = "mtu_expires",
4990509f 2923 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 2924 .maxlen = sizeof(int),
2925 .mode = 0644,
6d9f239a 2926 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 2927 },
2928 {
1da177e4 2929 .procname = "min_adv_mss",
4990509f 2930 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 2931 .maxlen = sizeof(int),
2932 .mode = 0644,
f3d3f616 2933 .proc_handler = proc_dointvec,
1da177e4
LT		 2934 },
2935 {
1da177e4 2936 .procname = "gc_min_interval_ms",
4990509f 2937 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 2938 .maxlen = sizeof(int),
2939 .mode = 0644,
6d9f239a 2940 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 2941 },
f8572d8f 2942 { }
1da177e4
LT		 2943};
2944
2c8c1e72 2945struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 2946{
2947 struct ctl_table *table;
2948
2949 table = kmemdup(ipv6_route_table_template,
2950 sizeof(ipv6_route_table_template),
2951 GFP_KERNEL);
5ee09105
YH		 2952
2953 if (table) {
2954 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 2955 table[0].extra1 = net;
86393e52 2956 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 2957 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2958 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2959 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2960 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2961 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2962 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2963 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 2964 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 2965
2966 /* Don't export sysctls to unprivileged users */
2967 if (net->user_ns != &init_user_ns)
2968 table[0].procname = NULL;
5ee09105
YH		 2969 }
2970
760f2d01
DL		 2971 return table;
2972}
1da177e4
LT		 2973#endif
2974
2c8c1e72 2975static int __net_init ip6_route_net_init(struct net *net)
cdb18761 2976{
633d424b 2977 int ret = -ENOMEM;
8ed67789 2978
86393e52
AD		 2979 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2980 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 2981
fc66f95c
ED		 2982 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2983 goto out_ip6_dst_ops;
2984
8ed67789
DL		 2985 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2986 sizeof(*net->ipv6.ip6_null_entry),
2987 GFP_KERNEL);
2988 if (!net->ipv6.ip6_null_entry)
fc66f95c 2989 goto out_ip6_dst_entries;
d8d1f30b 2990 net->ipv6.ip6_null_entry->dst.path =
8ed67789 2991 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 2992 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 2993 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2994 ip6_template_metrics, true);
8ed67789
DL		 2995
2996#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2997 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2998 sizeof(*net->ipv6.ip6_prohibit_entry),
2999 GFP_KERNEL);
68fffc67
PZ		 3000 if (!net->ipv6.ip6_prohibit_entry)
3001 goto out_ip6_null_entry;
d8d1f30b 3002 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3003 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3004 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3005 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3006 ip6_template_metrics, true);
8ed67789
DL		 3007
3008 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3009 sizeof(*net->ipv6.ip6_blk_hole_entry),
3010 GFP_KERNEL);
68fffc67
PZ		 3011 if (!net->ipv6.ip6_blk_hole_entry)
3012 goto out_ip6_prohibit_entry;
d8d1f30b 3013 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3014 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3015 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3016 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3017 ip6_template_metrics, true);
8ed67789
DL		 3018#endif
3019
b339a47c
PZ		 3020 net->ipv6.sysctl.flush_delay = 0;
3021 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3022 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3023 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3024 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3025 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3026 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3027 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3028
6891a346
BT		 3029 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3030
8ed67789
DL		 3031 ret = 0;
3032out:
3033 return ret;
f2fc6a54 3034
68fffc67
PZ		 3035#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3036out_ip6_prohibit_entry:
3037 kfree(net->ipv6.ip6_prohibit_entry);
3038out_ip6_null_entry:
3039 kfree(net->ipv6.ip6_null_entry);
3040#endif
fc66f95c
ED		 3041out_ip6_dst_entries:
3042 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3043out_ip6_dst_ops:
f2fc6a54 3044 goto out;
cdb18761
DL		 3045}
3046
2c8c1e72 3047static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3048{
8ed67789
DL		 3049 kfree(net->ipv6.ip6_null_entry);
3050#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3051 kfree(net->ipv6.ip6_prohibit_entry);
3052 kfree(net->ipv6.ip6_blk_hole_entry);
3053#endif
41bb78b4 3054 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3055}
3056
d189634e
TG		 3057static int __net_init ip6_route_net_init_late(struct net *net)
3058{
3059#ifdef CONFIG_PROC_FS
d4beaa66
G		 3060 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3061 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3062#endif
3063 return 0;
3064}
3065
3066static void __net_exit ip6_route_net_exit_late(struct net *net)
3067{
3068#ifdef CONFIG_PROC_FS
ece31ffd
G		 3069 remove_proc_entry("ipv6_route", net->proc_net);
3070 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3071#endif
3072}
3073
cdb18761
DL		 3074static struct pernet_operations ip6_route_net_ops = {
3075 .init = ip6_route_net_init,
3076 .exit = ip6_route_net_exit,
3077};
3078
c3426b47
DM		 3079static int __net_init ipv6_inetpeer_init(struct net *net)
3080{
3081 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3082
3083 if (!bp)
3084 return -ENOMEM;
3085 inet_peer_base_init(bp);
3086 net->ipv6.peers = bp;
3087 return 0;
3088}
3089
3090static void __net_exit ipv6_inetpeer_exit(struct net *net)
3091{
3092 struct inet_peer_base *bp = net->ipv6.peers;
3093
3094 net->ipv6.peers = NULL;
56a6b248 3095 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3096 kfree(bp);
3097}
3098
2b823f72 3099static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3100 .init = ipv6_inetpeer_init,
3101 .exit = ipv6_inetpeer_exit,
3102};
3103
d189634e
TG		 3104static struct pernet_operations ip6_route_net_late_ops = {
3105 .init = ip6_route_net_init_late,
3106 .exit = ip6_route_net_exit_late,
3107};
3108
8ed67789
DL		 3109static struct notifier_block ip6_route_dev_notifier = {
3110 .notifier_call = ip6_route_dev_notify,
3111 .priority = 0,
3112};
3113
433d49c3 3114int __init ip6_route_init(void)
1da177e4 3115{
433d49c3
DL		 3116 int ret;
3117
9a7ec3a9
DL		 3118 ret = -ENOMEM;
3119 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3120 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3121 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3122 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3123 goto out;
14e50e57 3124
fc66f95c 3125 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3126 if (ret)
bdb3289f 3127 goto out_kmem_cache;
bdb3289f 3128
c3426b47
DM		 3129 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3130 if (ret)
e8803b6c 3131 goto out_dst_entries;
2a0c451a 3132
7e52b33b
DM		 3133 ret = register_pernet_subsys(&ip6_route_net_ops);
3134 if (ret)
3135 goto out_register_inetpeer;
c3426b47 3136
5dc121e9
AE		 3137 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3138
8ed67789
DL		 3139 /* Registering of the loopback is done before this portion of code,
3140 * the loopback reference in rt6_info will not be taken, do it
3141 * manually for init_net */
d8d1f30b 3142 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3143 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3144 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3145 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3146 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3147 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3148 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3149 #endif
e8803b6c 3150 ret = fib6_init();
433d49c3 3151 if (ret)
8ed67789 3152 goto out_register_subsys;
433d49c3 3153
433d49c3
DL		 3154 ret = xfrm6_init();
3155 if (ret)
e8803b6c 3156 goto out_fib6_init;
c35b7e72 3157
433d49c3
DL		 3158 ret = fib6_rules_init();
3159 if (ret)
3160 goto xfrm6_init;
7e5449c2 3161
d189634e
TG		 3162 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3163 if (ret)
3164 goto fib6_rules_init;
3165
433d49c3 3166 ret = -ENOBUFS;
c7ac8679
GR		 3167 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3168 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3169 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3170 goto out_register_late_subsys;
c127ea2c 3171
8ed67789 3172 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3173 if (ret)
d189634e 3174 goto out_register_late_subsys;
8ed67789 3175
433d49c3
DL		 3176out:
3177 return ret;
3178
d189634e
TG		 3179out_register_late_subsys:
3180 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3181fib6_rules_init:
433d49c3
DL		 3182 fib6_rules_cleanup();
3183xfrm6_init:
433d49c3 3184 xfrm6_fini();
2a0c451a
TG		 3185out_fib6_init:
3186 fib6_gc_cleanup();
8ed67789
DL		 3187out_register_subsys:
3188 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3189out_register_inetpeer:
3190 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3191out_dst_entries:
3192 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3193out_kmem_cache:
f2fc6a54 3194 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3195 goto out;
1da177e4
LT		 3196}
3197
3198void ip6_route_cleanup(void)
3199{
8ed67789 3200 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3201 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3202 fib6_rules_cleanup();
1da177e4 3203 xfrm6_fini();
1da177e4 3204 fib6_gc_cleanup();
c3426b47 3205 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3206 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3207 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3208 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3209}
Linux 6.x block layer and io_uring tree(s)