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Merge tag 'trace-v4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[deliverable/linux.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>
904af04d 57#include <net/dst_metadata.h>
1da177e4 58#include <net/xfrm.h>
8d71740c 59#include <net/netevent.h>
21713ebc 60#include <net/netlink.h>
51ebd318 61#include <net/nexthop.h>
19e42e45 62#include <net/lwtunnel.h>
904af04d 63#include <net/ip_tunnels.h>
ca254490 64#include <net/l3mdev.h>
1da177e4
LT		 65
66#include <asm/uaccess.h>
67
68#ifdef CONFIG_SYSCTL
69#include <linux/sysctl.h>
70#endif
71
afc154e9 72enum rt6_nud_state {
7e980569
JB		 73 RT6_NUD_FAIL_HARD = -3,
74 RT6_NUD_FAIL_PROBE = -2,
75 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 76 RT6_NUD_SUCCEED = 1
77};
78
83a09abd 79static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
1da177e4 80static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 81static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 82static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 83static struct dst_entry *ip6_negative_advice(struct dst_entry *);
84static void ip6_dst_destroy(struct dst_entry *);
85static void ip6_dst_ifdown(struct dst_entry *,
86 struct net_device *dev, int how);
569d3645 87static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 88
89static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 90static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 91static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 92static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 93static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 94static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
95 struct sk_buff *skb, u32 mtu);
96static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
97 struct sk_buff *skb);
4b32b5ad 98static void rt6_dst_from_metrics_check(struct rt6_info *rt);
52bd4c0c 99static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 100
70ceb4f5 101#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 102static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, int ifindex,
95c96174 105 unsigned int pref);
efa2cea0 106static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 107 const struct in6_addr *prefix, int prefixlen,
108 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 109#endif
110
8d0b94af
MKL		 111struct uncached_list {
112 spinlock_t lock;
113 struct list_head head;
114};
115
116static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
117
118static void rt6_uncached_list_add(struct rt6_info *rt)
119{
120 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
121
122 rt->dst.flags |= DST_NOCACHE;
123 rt->rt6i_uncached_list = ul;
124
125 spin_lock_bh(&ul->lock);
126 list_add_tail(&rt->rt6i_uncached, &ul->head);
127 spin_unlock_bh(&ul->lock);
128}
129
130static void rt6_uncached_list_del(struct rt6_info *rt)
131{
132 if (!list_empty(&rt->rt6i_uncached)) {
133 struct uncached_list *ul = rt->rt6i_uncached_list;
134
135 spin_lock_bh(&ul->lock);
136 list_del(&rt->rt6i_uncached);
137 spin_unlock_bh(&ul->lock);
138 }
139}
140
141static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
142{
143 struct net_device *loopback_dev = net->loopback_dev;
144 int cpu;
145
e332bc67
EB		 146 if (dev == loopback_dev)
147 return;
148
8d0b94af
MKL		 149 for_each_possible_cpu(cpu) {
150 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
151 struct rt6_info *rt;
152
153 spin_lock_bh(&ul->lock);
154 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
155 struct inet6_dev *rt_idev = rt->rt6i_idev;
156 struct net_device *rt_dev = rt->dst.dev;
157
e332bc67 158 if (rt_idev->dev == dev) {
8d0b94af
MKL		 159 rt->rt6i_idev = in6_dev_get(loopback_dev);
160 in6_dev_put(rt_idev);
161 }
162
e332bc67 163 if (rt_dev == dev) {
8d0b94af
MKL		 164 rt->dst.dev = loopback_dev;
165 dev_hold(rt->dst.dev);
166 dev_put(rt_dev);
167 }
168 }
169 spin_unlock_bh(&ul->lock);
170 }
171}
172
d52d3997
MKL		 173static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
174{
175 return dst_metrics_write_ptr(rt->dst.from);
176}
177
06582540
DM		 178static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
179{
4b32b5ad 180 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 181
d52d3997
MKL		 182 if (rt->rt6i_flags & RTF_PCPU)
183 return rt6_pcpu_cow_metrics(rt);
184 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 185 return NULL;
186 else
3b471175 187 return dst_cow_metrics_generic(dst, old);
06582540
DM		 188}
189
f894cbf8
DM		 190static inline const void *choose_neigh_daddr(struct rt6_info *rt,
191 struct sk_buff *skb,
192 const void *daddr)
39232973
DM		 193{
194 struct in6_addr *p = &rt->rt6i_gateway;
195
a7563f34 196 if (!ipv6_addr_any(p))
39232973 197 return (const void *) p;
f894cbf8
DM		 198 else if (skb)
199 return &ipv6_hdr(skb)->daddr;
39232973
DM		 200 return daddr;
201}
202
f894cbf8
DM		 203static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
204 struct sk_buff *skb,
205 const void *daddr)
d3aaeb38 206{
39232973
DM		 207 struct rt6_info *rt = (struct rt6_info *) dst;
208 struct neighbour *n;
209
f894cbf8 210 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 211 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 212 if (n)
213 return n;
214 return neigh_create(&nd_tbl, daddr, dst->dev);
215}
216
9a7ec3a9 217static struct dst_ops ip6_dst_ops_template = {
1da177e4 218 .family = AF_INET6,
1da177e4
LT		 219 .gc = ip6_dst_gc,
220 .gc_thresh = 1024,
221 .check = ip6_dst_check,
0dbaee3b 222 .default_advmss = ip6_default_advmss,
ebb762f2 223 .mtu = ip6_mtu,
06582540 224 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 225 .destroy = ip6_dst_destroy,
226 .ifdown = ip6_dst_ifdown,
227 .negative_advice = ip6_negative_advice,
228 .link_failure = ip6_link_failure,
229 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 230 .redirect = rt6_do_redirect,
9f8955cc 231 .local_out = __ip6_local_out,
d3aaeb38 232 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 233};
234
ebb762f2 235static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 236{
618f9bc7
SK		 237 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
238
239 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 240}
241
6700c270
DM		 242static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
243 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 244{
245}
246
6700c270
DM		 247static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
248 struct sk_buff *skb)
b587ee3b
DM		 249{
250}
251
14e50e57
DM		 252static struct dst_ops ip6_dst_blackhole_ops = {
253 .family = AF_INET6,
14e50e57
DM		 254 .destroy = ip6_dst_destroy,
255 .check = ip6_dst_check,
ebb762f2 256 .mtu = ip6_blackhole_mtu,
214f45c9 257 .default_advmss = ip6_default_advmss,
14e50e57 258 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 259 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 260 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 261 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 262};
263
62fa8a84 264static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 265 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 266};
267
fb0af4c7 268static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 269 .dst = {
270 .__refcnt = ATOMIC_INIT(1),
271 .__use = 1,
2c20cbd7 272 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 273 .error = -ENETUNREACH,
d8d1f30b
CG		 274 .input = ip6_pkt_discard,
275 .output = ip6_pkt_discard_out,
1da177e4
LT		 276 },
277 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 278 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 279 .rt6i_metric = ~(u32) 0,
280 .rt6i_ref = ATOMIC_INIT(1),
281};
282
101367c2
TG		 283#ifdef CONFIG_IPV6_MULTIPLE_TABLES
284
fb0af4c7 285static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 286 .dst = {
287 .__refcnt = ATOMIC_INIT(1),
288 .__use = 1,
2c20cbd7 289 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 290 .error = -EACCES,
d8d1f30b
CG		 291 .input = ip6_pkt_prohibit,
292 .output = ip6_pkt_prohibit_out,
101367c2
TG		 293 },
294 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 295 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 296 .rt6i_metric = ~(u32) 0,
297 .rt6i_ref = ATOMIC_INIT(1),
298};
299
fb0af4c7 300static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 301 .dst = {
302 .__refcnt = ATOMIC_INIT(1),
303 .__use = 1,
2c20cbd7 304 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 305 .error = -EINVAL,
d8d1f30b 306 .input = dst_discard,
ede2059d 307 .output = dst_discard_out,
101367c2
TG		 308 },
309 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 310 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 311 .rt6i_metric = ~(u32) 0,
312 .rt6i_ref = ATOMIC_INIT(1),
313};
314
315#endif
316
ebfa45f0
MKL		 317static void rt6_info_init(struct rt6_info *rt)
318{
319 struct dst_entry *dst = &rt->dst;
320
321 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
322 INIT_LIST_HEAD(&rt->rt6i_siblings);
323 INIT_LIST_HEAD(&rt->rt6i_uncached);
324}
325
1da177e4 326/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 327static struct rt6_info *__ip6_dst_alloc(struct net *net,
328 struct net_device *dev,
ad706862 329 int flags)
1da177e4 330{
97bab73f 331 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 332 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 333
ebfa45f0
MKL		 334 if (rt)
335 rt6_info_init(rt);
8104891b 336
cf911662 337 return rt;
1da177e4
LT		 338}
339
d52d3997
MKL		 340static struct rt6_info *ip6_dst_alloc(struct net *net,
341 struct net_device *dev,
ad706862 342 int flags)
d52d3997 343{
ad706862 344 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 345
346 if (rt) {
347 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
348 if (rt->rt6i_pcpu) {
349 int cpu;
350
351 for_each_possible_cpu(cpu) {
352 struct rt6_info **p;
353
354 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
355 /* no one shares rt */
356 *p = NULL;
357 }
358 } else {
359 dst_destroy((struct dst_entry *)rt);
360 return NULL;
361 }
362 }
363
364 return rt;
365}
366
1da177e4
LT		 367static void ip6_dst_destroy(struct dst_entry *dst)
368{
369 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 370 struct dst_entry *from = dst->from;
8d0b94af 371 struct inet6_dev *idev;
1da177e4 372
4b32b5ad 373 dst_destroy_metrics_generic(dst);
87775312 374 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 375 rt6_uncached_list_del(rt);
376
377 idev = rt->rt6i_idev;
38308473 378 if (idev) {
1da177e4
LT		 379 rt->rt6i_idev = NULL;
380 in6_dev_put(idev);
1ab1457c 381 }
1716a961 382
ecd98837
YH		 383 dst->from = NULL;
384 dst_release(from);
b3419363
DM		 385}
386
1da177e4
LT		 387static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
388 int how)
389{
390 struct rt6_info *rt = (struct rt6_info *)dst;
391 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 392 struct net_device *loopback_dev =
c346dca1 393 dev_net(dev)->loopback_dev;
1da177e4 394
97cac082
DM		 395 if (dev != loopback_dev) {
396 if (idev && idev->dev == dev) {
397 struct inet6_dev *loopback_idev =
398 in6_dev_get(loopback_dev);
399 if (loopback_idev) {
400 rt->rt6i_idev = loopback_idev;
401 in6_dev_put(idev);
402 }
403 }
1da177e4
LT		 404 }
405}
406
a50feda5 407static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 408{
1716a961
G		 409 if (rt->rt6i_flags & RTF_EXPIRES) {
410 if (time_after(jiffies, rt->dst.expires))
a50feda5 411 return true;
1716a961 412 } else if (rt->dst.from) {
3fd91fb3 413 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 414 }
a50feda5 415 return false;
1da177e4
LT		 416}
417
51ebd318
ND		 418/* Multipath route selection:
419 * Hash based function using packet header and flowlabel.
420 * Adapted from fib_info_hashfn()
421 */
422static int rt6_info_hash_nhsfn(unsigned int candidate_count,
423 const struct flowi6 *fl6)
424{
644d0e65 425 return get_hash_from_flowi6(fl6) % candidate_count;
51ebd318
ND		 426}
427
428static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 429 struct flowi6 *fl6, int oif,
430 int strict)
51ebd318
ND		 431{
432 struct rt6_info *sibling, *next_sibling;
433 int route_choosen;
434
435 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
436 /* Don't change the route, if route_choosen == 0
437 * (siblings does not include ourself)
438 */
439 if (route_choosen)
440 list_for_each_entry_safe(sibling, next_sibling,
441 &match->rt6i_siblings, rt6i_siblings) {
442 route_choosen--;
443 if (route_choosen == 0) {
52bd4c0c
ND		 444 if (rt6_score_route(sibling, oif, strict) < 0)
445 break;
51ebd318
ND		 446 match = sibling;
447 break;
448 }
449 }
450 return match;
451}
452
1da177e4 453/*
c71099ac 454 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 455 */
456
8ed67789
DL		 457static inline struct rt6_info *rt6_device_match(struct net *net,
458 struct rt6_info *rt,
b71d1d42 459 const struct in6_addr *saddr,
1da177e4 460 int oif,
d420895e 461 int flags)
1da177e4
LT		 462{
463 struct rt6_info *local = NULL;
464 struct rt6_info *sprt;
465
dd3abc4e
YH		 466 if (!oif && ipv6_addr_any(saddr))
467 goto out;
468
d8d1f30b 469 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 470 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 471
472 if (oif) {
1da177e4
LT		 473 if (dev->ifindex == oif)
474 return sprt;
475 if (dev->flags & IFF_LOOPBACK) {
38308473 476 if (!sprt->rt6i_idev ||
1da177e4 477 sprt->rt6i_idev->dev->ifindex != oif) {
17fb0b2b 478 if (flags & RT6_LOOKUP_F_IFACE)
1da177e4 479 continue;
17fb0b2b
DA		 480 if (local &&
481 local->rt6i_idev->dev->ifindex == oif)
1da177e4
LT		 482 continue;
483 }
484 local = sprt;
485 }
dd3abc4e
YH		 486 } else {
487 if (ipv6_chk_addr(net, saddr, dev,
488 flags & RT6_LOOKUP_F_IFACE))
489 return sprt;
1da177e4 490 }
dd3abc4e 491 }
1da177e4 492
dd3abc4e 493 if (oif) {
1da177e4
LT		 494 if (local)
495 return local;
496
d420895e 497 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 498 return net->ipv6.ip6_null_entry;
1da177e4 499 }
dd3abc4e 500out:
1da177e4
LT		 501 return rt;
502}
503
27097255 504#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 505struct __rt6_probe_work {
506 struct work_struct work;
507 struct in6_addr target;
508 struct net_device *dev;
509};
510
511static void rt6_probe_deferred(struct work_struct *w)
512{
513 struct in6_addr mcaddr;
514 struct __rt6_probe_work *work =
515 container_of(w, struct __rt6_probe_work, work);
516
517 addrconf_addr_solict_mult(&work->target, &mcaddr);
38cf595b 518 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, NULL);
c2f17e82 519 dev_put(work->dev);
662f5533 520 kfree(work);
c2f17e82
HFS		 521}
522
27097255
YH		 523static void rt6_probe(struct rt6_info *rt)
524{
990edb42 525 struct __rt6_probe_work *work;
f2c31e32 526 struct neighbour *neigh;
27097255
YH		 527 /*
528 * Okay, this does not seem to be appropriate
529 * for now, however, we need to check if it
530 * is really so; aka Router Reachability Probing.
531 *
532 * Router Reachability Probe MUST be rate-limited
533 * to no more than one per minute.
534 */
2152caea 535 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 536 return;
2152caea
YH		 537 rcu_read_lock_bh();
538 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
539 if (neigh) {
8d6c31bf
MKL		 540 if (neigh->nud_state & NUD_VALID)
541 goto out;
542
990edb42 543 work = NULL;
2152caea 544 write_lock(&neigh->lock);
990edb42
MKL		 545 if (!(neigh->nud_state & NUD_VALID) &&
546 time_after(jiffies,
547 neigh->updated +
548 rt->rt6i_idev->cnf.rtr_probe_interval)) {
549 work = kmalloc(sizeof(*work), GFP_ATOMIC);
550 if (work)
551 __neigh_set_probe_once(neigh);
c2f17e82 552 }
2152caea 553 write_unlock(&neigh->lock);
990edb42
MKL		 554 } else {
555 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 556 }
990edb42
MKL		 557
558 if (work) {
559 INIT_WORK(&work->work, rt6_probe_deferred);
560 work->target = rt->rt6i_gateway;
561 dev_hold(rt->dst.dev);
562 work->dev = rt->dst.dev;
563 schedule_work(&work->work);
564 }
565
8d6c31bf 566out:
2152caea 567 rcu_read_unlock_bh();
27097255
YH		 568}
569#else
570static inline void rt6_probe(struct rt6_info *rt)
571{
27097255
YH		 572}
573#endif
574
1da177e4 575/*
554cfb7e 576 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 577 */
b6f99a21 578static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 579{
d1918542 580 struct net_device *dev = rt->dst.dev;
161980f4 581 if (!oif || dev->ifindex == oif)
554cfb7e 582 return 2;
161980f4
DM		 583 if ((dev->flags & IFF_LOOPBACK) &&
584 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
585 return 1;
586 return 0;
554cfb7e 587}
1da177e4 588
afc154e9 589static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 590{
f2c31e32 591 struct neighbour *neigh;
afc154e9 592 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 593
4d0c5911
YH		 594 if (rt->rt6i_flags & RTF_NONEXTHOP ||
595 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 596 return RT6_NUD_SUCCEED;
145a3621
YH		 597
598 rcu_read_lock_bh();
599 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
600 if (neigh) {
601 read_lock(&neigh->lock);
554cfb7e 602 if (neigh->nud_state & NUD_VALID)
afc154e9 603 ret = RT6_NUD_SUCCEED;
398bcbeb 604#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 605 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 606 ret = RT6_NUD_SUCCEED;
7e980569
JB		 607 else
608 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 609#endif
145a3621 610 read_unlock(&neigh->lock);
afc154e9
HFS		 611 } else {
612 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 613 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 614 }
145a3621
YH		 615 rcu_read_unlock_bh();
616
a5a81f0b 617 return ret;
1da177e4
LT		 618}
619
554cfb7e
YH		 620static int rt6_score_route(struct rt6_info *rt, int oif,
621 int strict)
1da177e4 622{
a5a81f0b 623 int m;
1ab1457c 624
4d0c5911 625 m = rt6_check_dev(rt, oif);
77d16f45 626 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 627 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 628#ifdef CONFIG_IPV6_ROUTER_PREF
629 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
630#endif
afc154e9
HFS		 631 if (strict & RT6_LOOKUP_F_REACHABLE) {
632 int n = rt6_check_neigh(rt);
633 if (n < 0)
634 return n;
635 }
554cfb7e
YH		 636 return m;
637}
638
f11e6659 639static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 640 int *mpri, struct rt6_info *match,
641 bool *do_rr)
554cfb7e 642{
f11e6659 643 int m;
afc154e9 644 bool match_do_rr = false;
35103d11
AG		 645 struct inet6_dev *idev = rt->rt6i_idev;
646 struct net_device *dev = rt->dst.dev;
647
648 if (dev && !netif_carrier_ok(dev) &&
649 idev->cnf.ignore_routes_with_linkdown)
650 goto out;
f11e6659
DM		 651
652 if (rt6_check_expired(rt))
653 goto out;
654
655 m = rt6_score_route(rt, oif, strict);
7e980569 656 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 657 match_do_rr = true;
658 m = 0; /* lowest valid score */
7e980569 659 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 660 goto out;
afc154e9
HFS		 661 }
662
663 if (strict & RT6_LOOKUP_F_REACHABLE)
664 rt6_probe(rt);
f11e6659 665
7e980569 666 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 667 if (m > *mpri) {
afc154e9 668 *do_rr = match_do_rr;
f11e6659
DM		 669 *mpri = m;
670 match = rt;
f11e6659 671 }
f11e6659
DM		 672out:
673 return match;
674}
675
676static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
677 struct rt6_info *rr_head,
afc154e9
HFS		 678 u32 metric, int oif, int strict,
679 bool *do_rr)
f11e6659 680{
9fbdcfaf 681 struct rt6_info *rt, *match, *cont;
554cfb7e 682 int mpri = -1;
1da177e4 683
f11e6659 684 match = NULL;
9fbdcfaf
SK		 685 cont = NULL;
686 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
687 if (rt->rt6i_metric != metric) {
688 cont = rt;
689 break;
690 }
691
692 match = find_match(rt, oif, strict, &mpri, match, do_rr);
693 }
694
695 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
696 if (rt->rt6i_metric != metric) {
697 cont = rt;
698 break;
699 }
700
afc154e9 701 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 702 }
703
704 if (match || !cont)
705 return match;
706
707 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 708 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 709
f11e6659
DM		 710 return match;
711}
1da177e4 712
f11e6659
DM		 713static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
714{
715 struct rt6_info *match, *rt0;
8ed67789 716 struct net *net;
afc154e9 717 bool do_rr = false;
1da177e4 718
f11e6659
DM		 719 rt0 = fn->rr_ptr;
720 if (!rt0)
721 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 722
afc154e9
HFS		 723 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
724 &do_rr);
1da177e4 725
afc154e9 726 if (do_rr) {
d8d1f30b 727 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 728
554cfb7e 729 /* no entries matched; do round-robin */
f11e6659
DM		 730 if (!next || next->rt6i_metric != rt0->rt6i_metric)
731 next = fn->leaf;
732
733 if (next != rt0)
734 fn->rr_ptr = next;
1da177e4 735 }
1da177e4 736
d1918542 737 net = dev_net(rt0->dst.dev);
a02cec21 738 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 739}
740
8b9df265
MKL		 741static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
742{
743 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
744}
745
70ceb4f5
YH		 746#ifdef CONFIG_IPV6_ROUTE_INFO
747int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 748 const struct in6_addr *gwaddr)
70ceb4f5 749{
c346dca1 750 struct net *net = dev_net(dev);
70ceb4f5
YH		 751 struct route_info *rinfo = (struct route_info *) opt;
752 struct in6_addr prefix_buf, *prefix;
753 unsigned int pref;
4bed72e4 754 unsigned long lifetime;
70ceb4f5
YH		 755 struct rt6_info *rt;
756
757 if (len < sizeof(struct route_info)) {
758 return -EINVAL;
759 }
760
761 /* Sanity check for prefix_len and length */
762 if (rinfo->length > 3) {
763 return -EINVAL;
764 } else if (rinfo->prefix_len > 128) {
765 return -EINVAL;
766 } else if (rinfo->prefix_len > 64) {
767 if (rinfo->length < 2) {
768 return -EINVAL;
769 }
770 } else if (rinfo->prefix_len > 0) {
771 if (rinfo->length < 1) {
772 return -EINVAL;
773 }
774 }
775
776 pref = rinfo->route_pref;
777 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 778 return -EINVAL;
70ceb4f5 779
4bed72e4 780 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 781
782 if (rinfo->length == 3)
783 prefix = (struct in6_addr *)rinfo->prefix;
784 else {
785 /* this function is safe */
786 ipv6_addr_prefix(&prefix_buf,
787 (struct in6_addr *)rinfo->prefix,
788 rinfo->prefix_len);
789 prefix = &prefix_buf;
790 }
791
f104a567
DJ		 792 if (rinfo->prefix_len == 0)
793 rt = rt6_get_dflt_router(gwaddr, dev);
794 else
795 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
796 gwaddr, dev->ifindex);
70ceb4f5
YH		 797
798 if (rt && !lifetime) {
e0a1ad73 799 ip6_del_rt(rt);
70ceb4f5
YH		 800 rt = NULL;
801 }
802
803 if (!rt && lifetime)
efa2cea0 804 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 805 pref);
806 else if (rt)
807 rt->rt6i_flags = RTF_ROUTEINFO |
808 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
809
810 if (rt) {
1716a961
G		 811 if (!addrconf_finite_timeout(lifetime))
812 rt6_clean_expires(rt);
813 else
814 rt6_set_expires(rt, jiffies + HZ * lifetime);
815
94e187c0 816 ip6_rt_put(rt);
70ceb4f5
YH		 817 }
818 return 0;
819}
820#endif
821
a3c00e46
MKL		 822static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
823 struct in6_addr *saddr)
824{
825 struct fib6_node *pn;
826 while (1) {
827 if (fn->fn_flags & RTN_TL_ROOT)
828 return NULL;
829 pn = fn->parent;
830 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
831 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
832 else
833 fn = pn;
834 if (fn->fn_flags & RTN_RTINFO)
835 return fn;
836 }
837}
c71099ac 838
8ed67789
DL		 839static struct rt6_info *ip6_pol_route_lookup(struct net *net,
840 struct fib6_table *table,
4c9483b2 841 struct flowi6 *fl6, int flags)
1da177e4
LT		 842{
843 struct fib6_node *fn;
844 struct rt6_info *rt;
845
c71099ac 846 read_lock_bh(&table->tb6_lock);
4c9483b2 847 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 848restart:
849 rt = fn->leaf;
4c9483b2 850 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 851 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 852 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 853 if (rt == net->ipv6.ip6_null_entry) {
854 fn = fib6_backtrack(fn, &fl6->saddr);
855 if (fn)
856 goto restart;
857 }
d8d1f30b 858 dst_use(&rt->dst, jiffies);
c71099ac 859 read_unlock_bh(&table->tb6_lock);
c71099ac
TG		 860 return rt;
861
862}
863
67ba4152 864struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 865 int flags)
866{
867 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
868}
869EXPORT_SYMBOL_GPL(ip6_route_lookup);
870
9acd9f3a
YH		 871struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
872 const struct in6_addr *saddr, int oif, int strict)
c71099ac 873{
4c9483b2
DM		 874 struct flowi6 fl6 = {
875 .flowi6_oif = oif,
876 .daddr = *daddr,
c71099ac
TG		 877 };
878 struct dst_entry *dst;
77d16f45 879 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 880
adaa70bb 881 if (saddr) {
4c9483b2 882 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 883 flags |= RT6_LOOKUP_F_HAS_SADDR;
884 }
885
4c9483b2 886 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 887 if (dst->error == 0)
888 return (struct rt6_info *) dst;
889
890 dst_release(dst);
891
1da177e4
LT		 892 return NULL;
893}
7159039a
YH		 894EXPORT_SYMBOL(rt6_lookup);
895
c71099ac 896/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 897 It takes new route entry, the addition fails by any reason the
898 route is freed. In any case, if caller does not hold it, it may
899 be destroyed.
900 */
901
e5fd387a 902static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 903 struct mx6_config *mxc)
1da177e4
LT		 904{
905 int err;
c71099ac 906 struct fib6_table *table;
1da177e4 907
c71099ac
TG		 908 table = rt->rt6i_table;
909 write_lock_bh(&table->tb6_lock);
e715b6d3 910 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 911 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 912
913 return err;
914}
915
40e22e8f
TG		 916int ip6_ins_rt(struct rt6_info *rt)
917{
e715b6d3
FW		 918 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
919 struct mx6_config mxc = { .mx = NULL, };
920
921 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 922}
923
8b9df265
MKL		 924static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
925 const struct in6_addr *daddr,
926 const struct in6_addr *saddr)
1da177e4 927{
1da177e4
LT		 928 struct rt6_info *rt;
929
930 /*
931 * Clone the route.
932 */
933
d52d3997 934 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 935 ort = (struct rt6_info *)ort->dst.from;
1da177e4 936
ad706862 937 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 938
939 if (!rt)
940 return NULL;
941
942 ip6_rt_copy_init(rt, ort);
943 rt->rt6i_flags |= RTF_CACHE;
944 rt->rt6i_metric = 0;
945 rt->dst.flags |= DST_HOST;
946 rt->rt6i_dst.addr = *daddr;
947 rt->rt6i_dst.plen = 128;
1da177e4 948
83a09abd
MKL		 949 if (!rt6_is_gw_or_nonexthop(ort)) {
950 if (ort->rt6i_dst.plen != 128 &&
951 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
952 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 953#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 954 if (rt->rt6i_src.plen && saddr) {
955 rt->rt6i_src.addr = *saddr;
956 rt->rt6i_src.plen = 128;
8b9df265 957 }
83a09abd 958#endif
95a9a5ba 959 }
1da177e4 960
95a9a5ba
YH		 961 return rt;
962}
1da177e4 963
d52d3997
MKL		 964static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
965{
966 struct rt6_info *pcpu_rt;
967
968 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 969 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 970
971 if (!pcpu_rt)
972 return NULL;
973 ip6_rt_copy_init(pcpu_rt, rt);
974 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
975 pcpu_rt->rt6i_flags |= RTF_PCPU;
976 return pcpu_rt;
977}
978
979/* It should be called with read_lock_bh(&tb6_lock) acquired */
980static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
981{
a73e4195 982 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 983
984 p = this_cpu_ptr(rt->rt6i_pcpu);
985 pcpu_rt = *p;
986
a73e4195
MKL		 987 if (pcpu_rt) {
988 dst_hold(&pcpu_rt->dst);
989 rt6_dst_from_metrics_check(pcpu_rt);
990 }
991 return pcpu_rt;
992}
993
994static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
995{
9c7370a1 996 struct fib6_table *table = rt->rt6i_table;
a73e4195 997 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 998
999 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1000 if (!pcpu_rt) {
1001 struct net *net = dev_net(rt->dst.dev);
1002
9c7370a1
MKL		 1003 dst_hold(&net->ipv6.ip6_null_entry->dst);
1004 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1005 }
1006
9c7370a1
MKL		 1007 read_lock_bh(&table->tb6_lock);
1008 if (rt->rt6i_pcpu) {
1009 p = this_cpu_ptr(rt->rt6i_pcpu);
1010 prev = cmpxchg(p, NULL, pcpu_rt);
1011 if (prev) {
1012 /* If someone did it before us, return prev instead */
1013 dst_destroy(&pcpu_rt->dst);
1014 pcpu_rt = prev;
1015 }
1016 } else {
1017 /* rt has been removed from the fib6 tree
1018 * before we have a chance to acquire the read_lock.
1019 * In this case, don't brother to create a pcpu rt
1020 * since rt is going away anyway. The next
1021 * dst_check() will trigger a re-lookup.
1022 */
d52d3997 1023 dst_destroy(&pcpu_rt->dst);
9c7370a1 1024 pcpu_rt = rt;
d52d3997 1025 }
d52d3997
MKL		 1026 dst_hold(&pcpu_rt->dst);
1027 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1028 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1029 return pcpu_rt;
1030}
1031
8ed67789 1032static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
4c9483b2 1033 struct flowi6 *fl6, int flags)
1da177e4 1034{
367efcb9 1035 struct fib6_node *fn, *saved_fn;
45e4fd26 1036 struct rt6_info *rt;
c71099ac 1037 int strict = 0;
1da177e4 1038
77d16f45 1039 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1040 if (net->ipv6.devconf_all->forwarding == 0)
1041 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1042
c71099ac 1043 read_lock_bh(&table->tb6_lock);
1da177e4 1044
4c9483b2 1045 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1046 saved_fn = fn;
1da177e4 1047
ca254490
DA		 1048 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1049 oif = 0;
1050
a3c00e46 1051redo_rt6_select:
367efcb9 1052 rt = rt6_select(fn, oif, strict);
52bd4c0c 1053 if (rt->rt6i_nsiblings)
367efcb9 1054 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1055 if (rt == net->ipv6.ip6_null_entry) {
1056 fn = fib6_backtrack(fn, &fl6->saddr);
1057 if (fn)
1058 goto redo_rt6_select;
367efcb9
MKL		 1059 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1060 /* also consider unreachable route */
1061 strict &= ~RT6_LOOKUP_F_REACHABLE;
1062 fn = saved_fn;
1063 goto redo_rt6_select;
367efcb9 1064 }
a3c00e46
MKL		 1065 }
1066
fb9de91e 1067
3da59bd9 1068 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1069 dst_use(&rt->dst, jiffies);
1070 read_unlock_bh(&table->tb6_lock);
1071
1072 rt6_dst_from_metrics_check(rt);
1073 return rt;
3da59bd9
MKL		 1074 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1075 !(rt->rt6i_flags & RTF_GATEWAY))) {
1076 /* Create a RTF_CACHE clone which will not be
1077 * owned by the fib6 tree. It is for the special case where
1078 * the daddr in the skb during the neighbor look-up is different
1079 * from the fl6->daddr used to look-up route here.
1080 */
1081
1082 struct rt6_info *uncached_rt;
1083
d52d3997
MKL		 1084 dst_use(&rt->dst, jiffies);
1085 read_unlock_bh(&table->tb6_lock);
1086
3da59bd9
MKL		 1087 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1088 dst_release(&rt->dst);
c71099ac 1089
3da59bd9 1090 if (uncached_rt)
8d0b94af 1091 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1092 else
1093 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1094
3da59bd9
MKL		 1095 dst_hold(&uncached_rt->dst);
1096 return uncached_rt;
3da59bd9 1097
d52d3997
MKL		 1098 } else {
1099 /* Get a percpu copy */
1100
1101 struct rt6_info *pcpu_rt;
1102
1103 rt->dst.lastuse = jiffies;
1104 rt->dst.__use++;
1105 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1106
9c7370a1
MKL		 1107 if (pcpu_rt) {
1108 read_unlock_bh(&table->tb6_lock);
1109 } else {
1110 /* We have to do the read_unlock first
1111 * because rt6_make_pcpu_route() may trigger
1112 * ip6_dst_gc() which will take the write_lock.
1113 */
1114 dst_hold(&rt->dst);
1115 read_unlock_bh(&table->tb6_lock);
a73e4195 1116 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1117 dst_release(&rt->dst);
1118 }
d52d3997
MKL		 1119
1120 return pcpu_rt;
9c7370a1 1121
d52d3997 1122 }
1da177e4
LT		 1123}
1124
8ed67789 1125static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1126 struct flowi6 *fl6, int flags)
4acad72d 1127{
4c9483b2 1128 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1129}
1130
72331bc0
SL		 1131static struct dst_entry *ip6_route_input_lookup(struct net *net,
1132 struct net_device *dev,
1133 struct flowi6 *fl6, int flags)
1134{
1135 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1136 flags |= RT6_LOOKUP_F_IFACE;
1137
1138 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1139}
1140
c71099ac
TG		 1141void ip6_route_input(struct sk_buff *skb)
1142{
b71d1d42 1143 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1144 struct net *net = dev_net(skb->dev);
adaa70bb 1145 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1146 struct ip_tunnel_info *tun_info;
4c9483b2 1147 struct flowi6 fl6 = {
ca254490 1148 .flowi6_iif = l3mdev_fib_oif(skb->dev),
4c9483b2
DM		 1149 .daddr = iph->daddr,
1150 .saddr = iph->saddr,
6502ca52 1151 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1152 .flowi6_mark = skb->mark,
1153 .flowi6_proto = iph->nexthdr,
c71099ac 1154 };
adaa70bb 1155
904af04d 1156 tun_info = skb_tunnel_info(skb);
46fa062a 1157 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1158 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1159 skb_dst_drop(skb);
72331bc0 1160 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1161}
1162
8ed67789 1163static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1164 struct flowi6 *fl6, int flags)
1da177e4 1165{
4c9483b2 1166 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1167}
1168
67ba4152 1169struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
4c9483b2 1170 struct flowi6 *fl6)
c71099ac 1171{
ca254490 1172 struct dst_entry *dst;
c71099ac 1173 int flags = 0;
d46a9d67 1174 bool any_src;
c71099ac 1175
ca254490
DA		 1176 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1177 if (dst)
1178 return dst;
1179
1fb9489b 1180 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1181
d46a9d67 1182 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1183 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1184 (fl6->flowi6_oif && any_src))
77d16f45 1185 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1186
d46a9d67 1187 if (!any_src)
adaa70bb 1188 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1189 else if (sk)
1190 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1191
4c9483b2 1192 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1193}
7159039a 1194EXPORT_SYMBOL(ip6_route_output);
1da177e4 1195
2774c131 1196struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1197{
5c1e6aa3 1198 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1199 struct dst_entry *new = NULL;
1200
f5b0a874 1201 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1202 if (rt) {
0a1f5962 1203 rt6_info_init(rt);
8104891b 1204
0a1f5962 1205 new = &rt->dst;
14e50e57 1206 new->__use = 1;
352e512c 1207 new->input = dst_discard;
ede2059d 1208 new->output = dst_discard_out;
14e50e57 1209
0a1f5962 1210 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1211 rt->rt6i_idev = ort->rt6i_idev;
1212 if (rt->rt6i_idev)
1213 in6_dev_hold(rt->rt6i_idev);
14e50e57 1214
4e3fd7a0 1215 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1216 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1217 rt->rt6i_metric = 0;
1218
1219 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1220#ifdef CONFIG_IPV6_SUBTREES
1221 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1222#endif
1223
1224 dst_free(new);
1225 }
1226
69ead7af
DM		 1227 dst_release(dst_orig);
1228 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1229}
14e50e57 1230
1da177e4
LT		 1231/*
1232 * Destination cache support functions
1233 */
1234
4b32b5ad
MKL		 1235static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1236{
1237 if (rt->dst.from &&
1238 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1239 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1240}
1241
3da59bd9
MKL		 1242static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1243{
1244 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1245 return NULL;
1246
1247 if (rt6_check_expired(rt))
1248 return NULL;
1249
1250 return &rt->dst;
1251}
1252
1253static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1254{
1255 if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1256 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1257 return &rt->dst;
1258 else
1259 return NULL;
1260}
1261
1da177e4
LT		 1262static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1263{
1264 struct rt6_info *rt;
1265
1266 rt = (struct rt6_info *) dst;
1267
6f3118b5
ND		 1268 /* All IPV6 dsts are created with ->obsolete set to the value
1269 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1270 * into this function always.
1271 */
e3bc10bd 1272
4b32b5ad
MKL		 1273 rt6_dst_from_metrics_check(rt);
1274
d52d3997 1275 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
3da59bd9
MKL		 1276 return rt6_dst_from_check(rt, cookie);
1277 else
1278 return rt6_check(rt, cookie);
1da177e4
LT		 1279}
1280
1281static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1282{
1283 struct rt6_info *rt = (struct rt6_info *) dst;
1284
1285 if (rt) {
54c1a859
YH		 1286 if (rt->rt6i_flags & RTF_CACHE) {
1287 if (rt6_check_expired(rt)) {
1288 ip6_del_rt(rt);
1289 dst = NULL;
1290 }
1291 } else {
1da177e4 1292 dst_release(dst);
54c1a859
YH		 1293 dst = NULL;
1294 }
1da177e4 1295 }
54c1a859 1296 return dst;
1da177e4
LT		 1297}
1298
1299static void ip6_link_failure(struct sk_buff *skb)
1300{
1301 struct rt6_info *rt;
1302
3ffe533c 1303 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1304
adf30907 1305 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1306 if (rt) {
1eb4f758
HFS		 1307 if (rt->rt6i_flags & RTF_CACHE) {
1308 dst_hold(&rt->dst);
8e3d5be7 1309 ip6_del_rt(rt);
1eb4f758 1310 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1311 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1312 }
1da177e4
LT		 1313 }
1314}
1315
45e4fd26
MKL		 1316static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1317{
1318 struct net *net = dev_net(rt->dst.dev);
1319
1320 rt->rt6i_flags |= RTF_MODIFIED;
1321 rt->rt6i_pmtu = mtu;
1322 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1323}
1324
1325static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1326 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1327{
67ba4152 1328 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1329
45e4fd26
MKL		 1330 if (rt6->rt6i_flags & RTF_LOCAL)
1331 return;
81aded24 1332
45e4fd26
MKL		 1333 dst_confirm(dst);
1334 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1335 if (mtu >= dst_mtu(dst))
1336 return;
9d289715 1337
45e4fd26
MKL		 1338 if (rt6->rt6i_flags & RTF_CACHE) {
1339 rt6_do_update_pmtu(rt6, mtu);
1340 } else {
1341 const struct in6_addr *daddr, *saddr;
1342 struct rt6_info *nrt6;
1343
1344 if (iph) {
1345 daddr = &iph->daddr;
1346 saddr = &iph->saddr;
1347 } else if (sk) {
1348 daddr = &sk->sk_v6_daddr;
1349 saddr = &inet6_sk(sk)->saddr;
1350 } else {
1351 return;
1352 }
1353 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1354 if (nrt6) {
1355 rt6_do_update_pmtu(nrt6, mtu);
1356
1357 /* ip6_ins_rt(nrt6) will bump the
1358 * rt6->rt6i_node->fn_sernum
1359 * which will fail the next rt6_check() and
1360 * invalidate the sk->sk_dst_cache.
1361 */
1362 ip6_ins_rt(nrt6);
1363 }
1da177e4
LT		 1364 }
1365}
1366
45e4fd26
MKL		 1367static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1368 struct sk_buff *skb, u32 mtu)
1369{
1370 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1371}
1372
42ae66c8
DM		 1373void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1374 int oif, u32 mark)
81aded24
DM		 1375{
1376 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1377 struct dst_entry *dst;
1378 struct flowi6 fl6;
1379
1380 memset(&fl6, 0, sizeof(fl6));
1381 fl6.flowi6_oif = oif;
1b3c61dc 1382 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1383 fl6.daddr = iph->daddr;
1384 fl6.saddr = iph->saddr;
6502ca52 1385 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1386
1387 dst = ip6_route_output(net, NULL, &fl6);
1388 if (!dst->error)
45e4fd26 1389 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1390 dst_release(dst);
1391}
1392EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1393
1394void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1395{
1396 ip6_update_pmtu(skb, sock_net(sk), mtu,
1397 sk->sk_bound_dev_if, sk->sk_mark);
1398}
1399EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1400
b55b76b2
DJ		 1401/* Handle redirects */
1402struct ip6rd_flowi {
1403 struct flowi6 fl6;
1404 struct in6_addr gateway;
1405};
1406
1407static struct rt6_info *__ip6_route_redirect(struct net *net,
1408 struct fib6_table *table,
1409 struct flowi6 *fl6,
1410 int flags)
1411{
1412 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1413 struct rt6_info *rt;
1414 struct fib6_node *fn;
1415
1416 /* Get the "current" route for this destination and
1417 * check if the redirect has come from approriate router.
1418 *
1419 * RFC 4861 specifies that redirects should only be
1420 * accepted if they come from the nexthop to the target.
1421 * Due to the way the routes are chosen, this notion
1422 * is a bit fuzzy and one might need to check all possible
1423 * routes.
1424 */
1425
1426 read_lock_bh(&table->tb6_lock);
1427 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1428restart:
1429 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1430 if (rt6_check_expired(rt))
1431 continue;
1432 if (rt->dst.error)
1433 break;
1434 if (!(rt->rt6i_flags & RTF_GATEWAY))
1435 continue;
1436 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1437 continue;
1438 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1439 continue;
1440 break;
1441 }
1442
1443 if (!rt)
1444 rt = net->ipv6.ip6_null_entry;
1445 else if (rt->dst.error) {
1446 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1447 goto out;
1448 }
1449
1450 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1451 fn = fib6_backtrack(fn, &fl6->saddr);
1452 if (fn)
1453 goto restart;
b55b76b2 1454 }
a3c00e46 1455
b0a1ba59 1456out:
b55b76b2
DJ		 1457 dst_hold(&rt->dst);
1458
1459 read_unlock_bh(&table->tb6_lock);
1460
1461 return rt;
1462};
1463
1464static struct dst_entry *ip6_route_redirect(struct net *net,
1465 const struct flowi6 *fl6,
1466 const struct in6_addr *gateway)
1467{
1468 int flags = RT6_LOOKUP_F_HAS_SADDR;
1469 struct ip6rd_flowi rdfl;
1470
1471 rdfl.fl6 = *fl6;
1472 rdfl.gateway = *gateway;
1473
1474 return fib6_rule_lookup(net, &rdfl.fl6,
1475 flags, __ip6_route_redirect);
1476}
1477
3a5ad2ee
DM		 1478void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1479{
1480 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1481 struct dst_entry *dst;
1482 struct flowi6 fl6;
1483
1484 memset(&fl6, 0, sizeof(fl6));
e374c618 1485 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1486 fl6.flowi6_oif = oif;
1487 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1488 fl6.daddr = iph->daddr;
1489 fl6.saddr = iph->saddr;
6502ca52 1490 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1491
b55b76b2
DJ		 1492 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1493 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1494 dst_release(dst);
1495}
1496EXPORT_SYMBOL_GPL(ip6_redirect);
1497
c92a59ec
DJ		 1498void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1499 u32 mark)
1500{
1501 const struct ipv6hdr *iph = ipv6_hdr(skb);
1502 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1503 struct dst_entry *dst;
1504 struct flowi6 fl6;
1505
1506 memset(&fl6, 0, sizeof(fl6));
e374c618 1507 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1508 fl6.flowi6_oif = oif;
1509 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1510 fl6.daddr = msg->dest;
1511 fl6.saddr = iph->daddr;
1512
b55b76b2
DJ		 1513 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1514 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1515 dst_release(dst);
1516}
1517
3a5ad2ee
DM		 1518void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1519{
1520 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1521}
1522EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1523
0dbaee3b 1524static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1525{
0dbaee3b
DM		 1526 struct net_device *dev = dst->dev;
1527 unsigned int mtu = dst_mtu(dst);
1528 struct net *net = dev_net(dev);
1529
1da177e4
LT		 1530 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1531
5578689a
DL		 1532 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1533 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1534
1535 /*
1ab1457c
YH		 1536 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1537 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1538 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1539 * rely only on pmtu discovery"
1540 */
1541 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1542 mtu = IPV6_MAXPLEN;
1543 return mtu;
1544}
1545
ebb762f2 1546static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1547{
4b32b5ad
MKL		 1548 const struct rt6_info *rt = (const struct rt6_info *)dst;
1549 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1550 struct inet6_dev *idev;
618f9bc7 1551
4b32b5ad
MKL		 1552 if (mtu)
1553 goto out;
1554
1555 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1556 if (mtu)
30f78d8e 1557 goto out;
618f9bc7
SK		 1558
1559 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1560
1561 rcu_read_lock();
1562 idev = __in6_dev_get(dst->dev);
1563 if (idev)
1564 mtu = idev->cnf.mtu6;
1565 rcu_read_unlock();
1566
30f78d8e
ED		 1567out:
1568 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1569}
1570
3b00944c
YH		 1571static struct dst_entry *icmp6_dst_gc_list;
1572static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1573
3b00944c 1574struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1575 struct flowi6 *fl6)
1da177e4 1576{
87a11578 1577 struct dst_entry *dst;
1da177e4
LT		 1578 struct rt6_info *rt;
1579 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1580 struct net *net = dev_net(dev);
1da177e4 1581
38308473 1582 if (unlikely(!idev))
122bdf67 1583 return ERR_PTR(-ENODEV);
1da177e4 1584
ad706862 1585 rt = ip6_dst_alloc(net, dev, 0);
38308473 1586 if (unlikely(!rt)) {
1da177e4 1587 in6_dev_put(idev);
87a11578 1588 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1589 goto out;
1590 }
1591
8e2ec639
YZ		 1592 rt->dst.flags |= DST_HOST;
1593 rt->dst.output = ip6_output;
d8d1f30b 1594 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1595 rt->rt6i_gateway = fl6->daddr;
87a11578 1596 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1597 rt->rt6i_dst.plen = 128;
1598 rt->rt6i_idev = idev;
14edd87d 1599 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1600
3b00944c 1601 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1602 rt->dst.next = icmp6_dst_gc_list;
1603 icmp6_dst_gc_list = &rt->dst;
3b00944c 1604 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1605
5578689a 1606 fib6_force_start_gc(net);
1da177e4 1607
87a11578
DM		 1608 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1609
1da177e4 1610out:
87a11578 1611 return dst;
1da177e4
LT		 1612}
1613
3d0f24a7 1614int icmp6_dst_gc(void)
1da177e4 1615{
e9476e95 1616 struct dst_entry *dst, **pprev;
3d0f24a7 1617 int more = 0;
1da177e4 1618
3b00944c
YH		 1619 spin_lock_bh(&icmp6_dst_lock);
1620 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1621
1da177e4
LT		 1622 while ((dst = *pprev) != NULL) {
1623 if (!atomic_read(&dst->__refcnt)) {
1624 *pprev = dst->next;
1625 dst_free(dst);
1da177e4
LT		 1626 } else {
1627 pprev = &dst->next;
3d0f24a7 1628 ++more;
1da177e4
LT		 1629 }
1630 }
1631
3b00944c 1632 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1633
3d0f24a7 1634 return more;
1da177e4
LT		 1635}
1636
1e493d19
DM		 1637static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1638 void *arg)
1639{
1640 struct dst_entry *dst, **pprev;
1641
1642 spin_lock_bh(&icmp6_dst_lock);
1643 pprev = &icmp6_dst_gc_list;
1644 while ((dst = *pprev) != NULL) {
1645 struct rt6_info *rt = (struct rt6_info *) dst;
1646 if (func(rt, arg)) {
1647 *pprev = dst->next;
1648 dst_free(dst);
1649 } else {
1650 pprev = &dst->next;
1651 }
1652 }
1653 spin_unlock_bh(&icmp6_dst_lock);
1654}
1655
569d3645 1656static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1657{
86393e52 1658 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1659 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1660 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1661 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1662 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1663 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1664 int entries;
7019b78e 1665
fc66f95c 1666 entries = dst_entries_get_fast(ops);
49a18d86 1667 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1668 entries <= rt_max_size)
1da177e4
LT		 1669 goto out;
1670
6891a346 1671 net->ipv6.ip6_rt_gc_expire++;
14956643 1672 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1673 entries = dst_entries_get_slow(ops);
1674 if (entries < ops->gc_thresh)
7019b78e 1675 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1676out:
7019b78e 1677 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1678 return entries > rt_max_size;
1da177e4
LT		 1679}
1680
e715b6d3
FW		 1681static int ip6_convert_metrics(struct mx6_config *mxc,
1682 const struct fib6_config *cfg)
1683{
c3a8d947 1684 bool ecn_ca = false;
e715b6d3
FW		 1685 struct nlattr *nla;
1686 int remaining;
1687 u32 *mp;
1688
63159f29 1689 if (!cfg->fc_mx)
e715b6d3
FW		 1690 return 0;
1691
1692 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1693 if (unlikely(!mp))
1694 return -ENOMEM;
1695
1696 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1697 int type = nla_type(nla);
1bb14807 1698 u32 val;
e715b6d3 1699
1bb14807
DB		 1700 if (!type)
1701 continue;
1702 if (unlikely(type > RTAX_MAX))
1703 goto err;
ea697639 1704
1bb14807
DB		 1705 if (type == RTAX_CC_ALGO) {
1706 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1707
1bb14807 1708 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1709 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1710 if (val == TCP_CA_UNSPEC)
1711 goto err;
1712 } else {
1713 val = nla_get_u32(nla);
e715b6d3 1714 }
b8d3e416
DB		 1715 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1716 goto err;
1bb14807
DB		 1717
1718 mp[type - 1] = val;
1719 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1720 }
1721
c3a8d947
DB		 1722 if (ecn_ca) {
1723 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1724 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1725 }
e715b6d3 1726
c3a8d947 1727 mxc->mx = mp;
e715b6d3
FW		 1728 return 0;
1729 err:
1730 kfree(mp);
1731 return -EINVAL;
1732}
1da177e4 1733
8c5b83f0 1734static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1735{
5578689a 1736 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1737 struct rt6_info *rt = NULL;
1738 struct net_device *dev = NULL;
1739 struct inet6_dev *idev = NULL;
c71099ac 1740 struct fib6_table *table;
1da177e4 1741 int addr_type;
8c5b83f0 1742 int err = -EINVAL;
1da177e4 1743
86872cb5 1744 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1745 goto out;
1da177e4 1746#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1747 if (cfg->fc_src_len)
8c5b83f0 1748 goto out;
1da177e4 1749#endif
86872cb5 1750 if (cfg->fc_ifindex) {
1da177e4 1751 err = -ENODEV;
5578689a 1752 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1753 if (!dev)
1754 goto out;
1755 idev = in6_dev_get(dev);
1756 if (!idev)
1757 goto out;
1758 }
1759
86872cb5
TG		 1760 if (cfg->fc_metric == 0)
1761 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1762
d71314b4 1763 err = -ENOBUFS;
38308473
DM		 1764 if (cfg->fc_nlinfo.nlh &&
1765 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1766 table = fib6_get_table(net, cfg->fc_table);
38308473 1767 if (!table) {
f3213831 1768 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1769 table = fib6_new_table(net, cfg->fc_table);
1770 }
1771 } else {
1772 table = fib6_new_table(net, cfg->fc_table);
1773 }
38308473
DM		 1774
1775 if (!table)
c71099ac 1776 goto out;
c71099ac 1777
ad706862
MKL		 1778 rt = ip6_dst_alloc(net, NULL,
1779 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1780
38308473 1781 if (!rt) {
1da177e4
LT		 1782 err = -ENOMEM;
1783 goto out;
1784 }
1785
1716a961
G		 1786 if (cfg->fc_flags & RTF_EXPIRES)
1787 rt6_set_expires(rt, jiffies +
1788 clock_t_to_jiffies(cfg->fc_expires));
1789 else
1790 rt6_clean_expires(rt);
1da177e4 1791
86872cb5
TG		 1792 if (cfg->fc_protocol == RTPROT_UNSPEC)
1793 cfg->fc_protocol = RTPROT_BOOT;
1794 rt->rt6i_protocol = cfg->fc_protocol;
1795
1796 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1797
1798 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1799 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1800 else if (cfg->fc_flags & RTF_LOCAL)
1801 rt->dst.input = ip6_input;
1da177e4 1802 else
d8d1f30b 1803 rt->dst.input = ip6_forward;
1da177e4 1804
d8d1f30b 1805 rt->dst.output = ip6_output;
1da177e4 1806
19e42e45
RP		 1807 if (cfg->fc_encap) {
1808 struct lwtunnel_state *lwtstate;
1809
1810 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1811 cfg->fc_encap, AF_INET6, cfg,
1812 &lwtstate);
19e42e45
RP		 1813 if (err)
1814 goto out;
61adedf3
JB		 1815 rt->dst.lwtstate = lwtstate_get(lwtstate);
1816 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1817 rt->dst.lwtstate->orig_output = rt->dst.output;
1818 rt->dst.output = lwtunnel_output;
25368623 1819 }
61adedf3
JB		 1820 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1821 rt->dst.lwtstate->orig_input = rt->dst.input;
1822 rt->dst.input = lwtunnel_input;
25368623 1823 }
19e42e45
RP		 1824 }
1825
86872cb5
TG		 1826 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1827 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1828 if (rt->rt6i_dst.plen == 128)
e5fd387a 1829 rt->dst.flags |= DST_HOST;
e5fd387a 1830
1da177e4 1831#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1832 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1833 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1834#endif
1835
86872cb5 1836 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1837
1838 /* We cannot add true routes via loopback here,
1839 they would result in kernel looping; promote them to reject routes
1840 */
86872cb5 1841 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1842 (dev && (dev->flags & IFF_LOOPBACK) &&
1843 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1844 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1845 /* hold loopback dev/idev if we haven't done so. */
5578689a 1846 if (dev != net->loopback_dev) {
1da177e4
LT		 1847 if (dev) {
1848 dev_put(dev);
1849 in6_dev_put(idev);
1850 }
5578689a 1851 dev = net->loopback_dev;
1da177e4
LT		 1852 dev_hold(dev);
1853 idev = in6_dev_get(dev);
1854 if (!idev) {
1855 err = -ENODEV;
1856 goto out;
1857 }
1858 }
1da177e4 1859 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1860 switch (cfg->fc_type) {
1861 case RTN_BLACKHOLE:
1862 rt->dst.error = -EINVAL;
ede2059d 1863 rt->dst.output = dst_discard_out;
7150aede 1864 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1865 break;
1866 case RTN_PROHIBIT:
1867 rt->dst.error = -EACCES;
7150aede
K		 1868 rt->dst.output = ip6_pkt_prohibit_out;
1869 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1870 break;
b4949ab2 1871 case RTN_THROW:
0315e382 1872 case RTN_UNREACHABLE:
ef2c7d7b 1873 default:
7150aede 1874 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1875 : (cfg->fc_type == RTN_UNREACHABLE)
1876 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1877 rt->dst.output = ip6_pkt_discard_out;
1878 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1879 break;
1880 }
1da177e4
LT		 1881 goto install_route;
1882 }
1883
86872cb5 1884 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1885 const struct in6_addr *gw_addr;
1da177e4
LT		 1886 int gwa_type;
1887
86872cb5 1888 gw_addr = &cfg->fc_gateway;
330567b7 1889 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1890
1891 /* if gw_addr is local we will fail to detect this in case
1892 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1893 * will return already-added prefix route via interface that
1894 * prefix route was assigned to, which might be non-loopback.
1895 */
1896 err = -EINVAL;
330567b7
FW		 1897 if (ipv6_chk_addr_and_flags(net, gw_addr,
1898 gwa_type & IPV6_ADDR_LINKLOCAL ?
1899 dev : NULL, 0, 0))
48ed7b26
FW		 1900 goto out;
1901
4e3fd7a0 1902 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1903
1904 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1905 struct rt6_info *grt;
1906
1907 /* IPv6 strictly inhibits using not link-local
1908 addresses as nexthop address.
1909 Otherwise, router will not able to send redirects.
1910 It is very good, but in some (rare!) circumstances
1911 (SIT, PtP, NBMA NOARP links) it is handy to allow
1912 some exceptions. --ANK
1913 */
38308473 1914 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1915 goto out;
1916
5578689a 1917 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1918
1919 err = -EHOSTUNREACH;
38308473 1920 if (!grt)
1da177e4
LT		 1921 goto out;
1922 if (dev) {
d1918542 1923 if (dev != grt->dst.dev) {
94e187c0 1924 ip6_rt_put(grt);
1da177e4
LT		 1925 goto out;
1926 }
1927 } else {
d1918542 1928 dev = grt->dst.dev;
1da177e4
LT		 1929 idev = grt->rt6i_idev;
1930 dev_hold(dev);
1931 in6_dev_hold(grt->rt6i_idev);
1932 }
38308473 1933 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1934 err = 0;
94e187c0 1935 ip6_rt_put(grt);
1da177e4
LT		 1936
1937 if (err)
1938 goto out;
1939 }
1940 err = -EINVAL;
38308473 1941 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1942 goto out;
1943 }
1944
1945 err = -ENODEV;
38308473 1946 if (!dev)
1da177e4
LT		 1947 goto out;
1948
c3968a85
DW		 1949 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1950 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1951 err = -EINVAL;
1952 goto out;
1953 }
4e3fd7a0 1954 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1955 rt->rt6i_prefsrc.plen = 128;
1956 } else
1957 rt->rt6i_prefsrc.plen = 0;
1958
86872cb5 1959 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1960
1961install_route:
d8d1f30b 1962 rt->dst.dev = dev;
1da177e4 1963 rt->rt6i_idev = idev;
c71099ac 1964 rt->rt6i_table = table;
63152fc0 1965
c346dca1 1966 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1967
8c5b83f0 1968 return rt;
6b9ea5a6
RP		 1969out:
1970 if (dev)
1971 dev_put(dev);
1972 if (idev)
1973 in6_dev_put(idev);
1974 if (rt)
1975 dst_free(&rt->dst);
1976
8c5b83f0 1977 return ERR_PTR(err);
6b9ea5a6
RP		 1978}
1979
1980int ip6_route_add(struct fib6_config *cfg)
1981{
1982 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 1983 struct rt6_info *rt;
6b9ea5a6
RP		 1984 int err;
1985
8c5b83f0
RP		 1986 rt = ip6_route_info_create(cfg);
1987 if (IS_ERR(rt)) {
1988 err = PTR_ERR(rt);
1989 rt = NULL;
6b9ea5a6 1990 goto out;
8c5b83f0 1991 }
6b9ea5a6 1992
e715b6d3
FW		 1993 err = ip6_convert_metrics(&mxc, cfg);
1994 if (err)
1995 goto out;
1da177e4 1996
e715b6d3
FW		 1997 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
1998
1999 kfree(mxc.mx);
6b9ea5a6 2000
e715b6d3 2001 return err;
1da177e4 2002out:
1da177e4 2003 if (rt)
d8d1f30b 2004 dst_free(&rt->dst);
6b9ea5a6 2005
1da177e4
LT		 2006 return err;
2007}
2008
86872cb5 2009static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2010{
2011 int err;
c71099ac 2012 struct fib6_table *table;
d1918542 2013 struct net *net = dev_net(rt->dst.dev);
1da177e4 2014
8e3d5be7
MKL		 2015 if (rt == net->ipv6.ip6_null_entry ||
2016 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2017 err = -ENOENT;
2018 goto out;
2019 }
6c813a72 2020
c71099ac
TG		 2021 table = rt->rt6i_table;
2022 write_lock_bh(&table->tb6_lock);
86872cb5 2023 err = fib6_del(rt, info);
c71099ac 2024 write_unlock_bh(&table->tb6_lock);
1da177e4 2025
6825a26c 2026out:
94e187c0 2027 ip6_rt_put(rt);
1da177e4
LT		 2028 return err;
2029}
2030
e0a1ad73
TG		 2031int ip6_del_rt(struct rt6_info *rt)
2032{
4d1169c1 2033 struct nl_info info = {
d1918542 2034 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2035 };
528c4ceb 2036 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2037}
2038
86872cb5 2039static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2040{
c71099ac 2041 struct fib6_table *table;
1da177e4
LT		 2042 struct fib6_node *fn;
2043 struct rt6_info *rt;
2044 int err = -ESRCH;
2045
5578689a 2046 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2047 if (!table)
c71099ac
TG		 2048 return err;
2049
2050 read_lock_bh(&table->tb6_lock);
1da177e4 2051
c71099ac 2052 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2053 &cfg->fc_dst, cfg->fc_dst_len,
2054 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2055
1da177e4 2056 if (fn) {
d8d1f30b 2057 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2058 if ((rt->rt6i_flags & RTF_CACHE) &&
2059 !(cfg->fc_flags & RTF_CACHE))
2060 continue;
86872cb5 2061 if (cfg->fc_ifindex &&
d1918542
DM		 2062 (!rt->dst.dev ||
2063 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2064 continue;
86872cb5
TG		 2065 if (cfg->fc_flags & RTF_GATEWAY &&
2066 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2067 continue;
86872cb5 2068 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2069 continue;
d8d1f30b 2070 dst_hold(&rt->dst);
c71099ac 2071 read_unlock_bh(&table->tb6_lock);
1da177e4 2072
86872cb5 2073 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2074 }
2075 }
c71099ac 2076 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2077
2078 return err;
2079}
2080
6700c270 2081static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2082{
a6279458 2083 struct netevent_redirect netevent;
e8599ff4 2084 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2085 struct ndisc_options ndopts;
2086 struct inet6_dev *in6_dev;
2087 struct neighbour *neigh;
71bcdba0 2088 struct rd_msg *msg;
6e157b6a
DM		 2089 int optlen, on_link;
2090 u8 *lladdr;
e8599ff4 2091
29a3cad5 2092 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2093 optlen -= sizeof(*msg);
e8599ff4
DM		 2094
2095 if (optlen < 0) {
6e157b6a 2096 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2097 return;
2098 }
2099
71bcdba0 2100 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2101
71bcdba0 2102 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2103 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2104 return;
2105 }
2106
6e157b6a 2107 on_link = 0;
71bcdba0 2108 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2109 on_link = 1;
71bcdba0 2110 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2111 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2112 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2113 return;
2114 }
2115
2116 in6_dev = __in6_dev_get(skb->dev);
2117 if (!in6_dev)
2118 return;
2119 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2120 return;
2121
2122 /* RFC2461 8.1:
2123 * The IP source address of the Redirect MUST be the same as the current
2124 * first-hop router for the specified ICMP Destination Address.
2125 */
2126
71bcdba0 2127 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2128 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2129 return;
2130 }
6e157b6a
DM		 2131
2132 lladdr = NULL;
e8599ff4
DM		 2133 if (ndopts.nd_opts_tgt_lladdr) {
2134 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2135 skb->dev);
2136 if (!lladdr) {
2137 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2138 return;
2139 }
2140 }
2141
6e157b6a 2142 rt = (struct rt6_info *) dst;
ec13ad1d 2143 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2144 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2145 return;
6e157b6a 2146 }
e8599ff4 2147
6e157b6a
DM		 2148 /* Redirect received -> path was valid.
2149 * Look, redirects are sent only in response to data packets,
2150 * so that this nexthop apparently is reachable. --ANK
2151 */
2152 dst_confirm(&rt->dst);
a6279458 2153
71bcdba0 2154 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2155 if (!neigh)
2156 return;
a6279458 2157
1da177e4
LT		 2158 /*
2159 * We have finally decided to accept it.
2160 */
2161
1ab1457c 2162 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2163 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2164 NEIGH_UPDATE_F_OVERRIDE|
2165 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2166 NEIGH_UPDATE_F_ISROUTER))
2167 );
2168
83a09abd 2169 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2170 if (!nrt)
1da177e4
LT		 2171 goto out;
2172
2173 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2174 if (on_link)
2175 nrt->rt6i_flags &= ~RTF_GATEWAY;
2176
4e3fd7a0 2177 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2178
40e22e8f 2179 if (ip6_ins_rt(nrt))
1da177e4
LT		 2180 goto out;
2181
d8d1f30b
CG		 2182 netevent.old = &rt->dst;
2183 netevent.new = &nrt->dst;
71bcdba0 2184 netevent.daddr = &msg->dest;
60592833 2185 netevent.neigh = neigh;
8d71740c
TT		 2186 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2187
38308473 2188 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2189 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2190 ip6_del_rt(rt);
1da177e4
LT		 2191 }
2192
2193out:
e8599ff4 2194 neigh_release(neigh);
6e157b6a
DM		 2195}
2196
1da177e4
LT		 2197/*
2198 * Misc support functions
2199 */
2200
4b32b5ad
MKL		 2201static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2202{
2203 BUG_ON(from->dst.from);
2204
2205 rt->rt6i_flags &= ~RTF_EXPIRES;
2206 dst_hold(&from->dst);
2207 rt->dst.from = &from->dst;
2208 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2209}
2210
83a09abd
MKL		 2211static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2212{
2213 rt->dst.input = ort->dst.input;
2214 rt->dst.output = ort->dst.output;
2215 rt->rt6i_dst = ort->rt6i_dst;
2216 rt->dst.error = ort->dst.error;
2217 rt->rt6i_idev = ort->rt6i_idev;
2218 if (rt->rt6i_idev)
2219 in6_dev_hold(rt->rt6i_idev);
2220 rt->dst.lastuse = jiffies;
2221 rt->rt6i_gateway = ort->rt6i_gateway;
2222 rt->rt6i_flags = ort->rt6i_flags;
2223 rt6_set_from(rt, ort);
2224 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2225#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2226 rt->rt6i_src = ort->rt6i_src;
1da177e4 2227#endif
83a09abd
MKL		 2228 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2229 rt->rt6i_table = ort->rt6i_table;
61adedf3 2230 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2231}
2232
70ceb4f5 2233#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2234static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2235 const struct in6_addr *prefix, int prefixlen,
2236 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2237{
2238 struct fib6_node *fn;
2239 struct rt6_info *rt = NULL;
c71099ac
TG		 2240 struct fib6_table *table;
2241
efa2cea0 2242 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2243 if (!table)
c71099ac 2244 return NULL;
70ceb4f5 2245
5744dd9b 2246 read_lock_bh(&table->tb6_lock);
67ba4152 2247 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2248 if (!fn)
2249 goto out;
2250
d8d1f30b 2251 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2252 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2253 continue;
2254 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2255 continue;
2256 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2257 continue;
d8d1f30b 2258 dst_hold(&rt->dst);
70ceb4f5
YH		 2259 break;
2260 }
2261out:
5744dd9b 2262 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2263 return rt;
2264}
2265
efa2cea0 2266static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2267 const struct in6_addr *prefix, int prefixlen,
2268 const struct in6_addr *gwaddr, int ifindex,
95c96174 2269 unsigned int pref)
70ceb4f5 2270{
86872cb5 2271 struct fib6_config cfg = {
238fc7ea 2272 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2273 .fc_ifindex = ifindex,
2274 .fc_dst_len = prefixlen,
2275 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2276 RTF_UP | RTF_PREF(pref),
15e47304 2277 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2278 .fc_nlinfo.nlh = NULL,
2279 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2280 };
2281
ca254490 2282 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2283 cfg.fc_dst = *prefix;
2284 cfg.fc_gateway = *gwaddr;
70ceb4f5 2285
e317da96
YH		 2286 /* We should treat it as a default route if prefix length is 0. */
2287 if (!prefixlen)
86872cb5 2288 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2289
86872cb5 2290 ip6_route_add(&cfg);
70ceb4f5 2291
efa2cea0 2292 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2293}
2294#endif
2295
b71d1d42 2296struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2297{
1da177e4 2298 struct rt6_info *rt;
c71099ac 2299 struct fib6_table *table;
1da177e4 2300
c346dca1 2301 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2302 if (!table)
c71099ac 2303 return NULL;
1da177e4 2304
5744dd9b 2305 read_lock_bh(&table->tb6_lock);
67ba4152 2306 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2307 if (dev == rt->dst.dev &&
045927ff 2308 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2309 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2310 break;
2311 }
2312 if (rt)
d8d1f30b 2313 dst_hold(&rt->dst);
5744dd9b 2314 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2315 return rt;
2316}
2317
b71d1d42 2318struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2319 struct net_device *dev,
2320 unsigned int pref)
1da177e4 2321{
86872cb5 2322 struct fib6_config cfg = {
ca254490 2323 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2324 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2325 .fc_ifindex = dev->ifindex,
2326 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2327 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2328 .fc_nlinfo.portid = 0,
5578689a 2329 .fc_nlinfo.nlh = NULL,
c346dca1 2330 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2331 };
1da177e4 2332
4e3fd7a0 2333 cfg.fc_gateway = *gwaddr;
1da177e4 2334
86872cb5 2335 ip6_route_add(&cfg);
1da177e4 2336
1da177e4
LT		 2337 return rt6_get_dflt_router(gwaddr, dev);
2338}
2339
7b4da532 2340void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2341{
2342 struct rt6_info *rt;
c71099ac
TG		 2343 struct fib6_table *table;
2344
2345 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2346 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2347 if (!table)
c71099ac 2348 return;
1da177e4
LT		 2349
2350restart:
c71099ac 2351 read_lock_bh(&table->tb6_lock);
d8d1f30b 2352 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2353 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2354 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2355 dst_hold(&rt->dst);
c71099ac 2356 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2357 ip6_del_rt(rt);
1da177e4
LT		 2358 goto restart;
2359 }
2360 }
c71099ac 2361 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2362}
2363
5578689a
DL		 2364static void rtmsg_to_fib6_config(struct net *net,
2365 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2366 struct fib6_config *cfg)
2367{
2368 memset(cfg, 0, sizeof(*cfg));
2369
ca254490
DA		 2370 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2371 : RT6_TABLE_MAIN;
86872cb5
TG		 2372 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2373 cfg->fc_metric = rtmsg->rtmsg_metric;
2374 cfg->fc_expires = rtmsg->rtmsg_info;
2375 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2376 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2377 cfg->fc_flags = rtmsg->rtmsg_flags;
2378
5578689a 2379 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2380
4e3fd7a0
AD		 2381 cfg->fc_dst = rtmsg->rtmsg_dst;
2382 cfg->fc_src = rtmsg->rtmsg_src;
2383 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2384}
2385
5578689a 2386int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2387{
86872cb5 2388 struct fib6_config cfg;
1da177e4
LT		 2389 struct in6_rtmsg rtmsg;
2390 int err;
2391
67ba4152 2392 switch (cmd) {
1da177e4
LT		 2393 case SIOCADDRT: /* Add a route */
2394 case SIOCDELRT: /* Delete a route */
af31f412 2395 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2396 return -EPERM;
2397 err = copy_from_user(&rtmsg, arg,
2398 sizeof(struct in6_rtmsg));
2399 if (err)
2400 return -EFAULT;
86872cb5 2401
5578689a 2402 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2403
1da177e4
LT		 2404 rtnl_lock();
2405 switch (cmd) {
2406 case SIOCADDRT:
86872cb5 2407 err = ip6_route_add(&cfg);
1da177e4
LT		 2408 break;
2409 case SIOCDELRT:
86872cb5 2410 err = ip6_route_del(&cfg);
1da177e4
LT		 2411 break;
2412 default:
2413 err = -EINVAL;
2414 }
2415 rtnl_unlock();
2416
2417 return err;
3ff50b79 2418 }
1da177e4
LT		 2419
2420 return -EINVAL;
2421}
2422
2423/*
2424 * Drop the packet on the floor
2425 */
2426
d5fdd6ba 2427static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2428{
612f09e8 2429 int type;
adf30907 2430 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2431 switch (ipstats_mib_noroutes) {
2432 case IPSTATS_MIB_INNOROUTES:
0660e03f 2433 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2434 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2435 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2436 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2437 break;
2438 }
2439 /* FALLTHROUGH */
2440 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2441 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2442 ipstats_mib_noroutes);
612f09e8
YH		 2443 break;
2444 }
3ffe533c 2445 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2446 kfree_skb(skb);
2447 return 0;
2448}
2449
9ce8ade0
TG		 2450static int ip6_pkt_discard(struct sk_buff *skb)
2451{
612f09e8 2452 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2453}
2454
ede2059d 2455static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2456{
adf30907 2457 skb->dev = skb_dst(skb)->dev;
612f09e8 2458 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2459}
2460
9ce8ade0
TG		 2461static int ip6_pkt_prohibit(struct sk_buff *skb)
2462{
612f09e8 2463 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2464}
2465
ede2059d 2466static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2467{
adf30907 2468 skb->dev = skb_dst(skb)->dev;
612f09e8 2469 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2470}
2471
1da177e4
LT		 2472/*
2473 * Allocate a dst for local (unicast / anycast) address.
2474 */
2475
2476struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2477 const struct in6_addr *addr,
8f031519 2478 bool anycast)
1da177e4 2479{
ca254490 2480 u32 tb_id;
c346dca1 2481 struct net *net = dev_net(idev->dev);
a3300ef4 2482 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2483 DST_NOCOUNT);
a3300ef4 2484 if (!rt)
1da177e4
LT		 2485 return ERR_PTR(-ENOMEM);
2486
1da177e4
LT		 2487 in6_dev_hold(idev);
2488
11d53b49 2489 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2490 rt->dst.input = ip6_input;
2491 rt->dst.output = ip6_output;
1da177e4 2492 rt->rt6i_idev = idev;
1da177e4
LT		 2493
2494 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2495 if (anycast)
2496 rt->rt6i_flags |= RTF_ANYCAST;
2497 else
1da177e4 2498 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2499
550bab42 2500 rt->rt6i_gateway = *addr;
4e3fd7a0 2501 rt->rt6i_dst.addr = *addr;
1da177e4 2502 rt->rt6i_dst.plen = 128;
ca254490
DA		 2503 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2504 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2505 rt->dst.flags |= DST_NOCACHE;
1da177e4 2506
d8d1f30b 2507 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2508
2509 return rt;
2510}
2511
c3968a85
DW		 2512int ip6_route_get_saddr(struct net *net,
2513 struct rt6_info *rt,
b71d1d42 2514 const struct in6_addr *daddr,
c3968a85
DW		 2515 unsigned int prefs,
2516 struct in6_addr *saddr)
2517{
e16e888b
MS		 2518 struct inet6_dev *idev =
2519 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2520 int err = 0;
e16e888b 2521 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2522 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2523 else
2524 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2525 daddr, prefs, saddr);
2526 return err;
2527}
2528
2529/* remove deleted ip from prefsrc entries */
2530struct arg_dev_net_ip {
2531 struct net_device *dev;
2532 struct net *net;
2533 struct in6_addr *addr;
2534};
2535
2536static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2537{
2538 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2539 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2540 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2541
d1918542 2542 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2543 rt != net->ipv6.ip6_null_entry &&
2544 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2545 /* remove prefsrc entry */
2546 rt->rt6i_prefsrc.plen = 0;
2547 }
2548 return 0;
2549}
2550
2551void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2552{
2553 struct net *net = dev_net(ifp->idev->dev);
2554 struct arg_dev_net_ip adni = {
2555 .dev = ifp->idev->dev,
2556 .net = net,
2557 .addr = &ifp->addr,
2558 };
0c3584d5 2559 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2560}
2561
be7a010d
DJ		 2562#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2563#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2564
2565/* Remove routers and update dst entries when gateway turn into host. */
2566static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2567{
2568 struct in6_addr *gateway = (struct in6_addr *)arg;
2569
2570 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2571 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2572 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2573 return -1;
2574 }
2575 return 0;
2576}
2577
2578void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2579{
2580 fib6_clean_all(net, fib6_clean_tohost, gateway);
2581}
2582
8ed67789
DL		 2583struct arg_dev_net {
2584 struct net_device *dev;
2585 struct net *net;
2586};
2587
1da177e4
LT		 2588static int fib6_ifdown(struct rt6_info *rt, void *arg)
2589{
bc3ef660 2590 const struct arg_dev_net *adn = arg;
2591 const struct net_device *dev = adn->dev;
8ed67789 2592
d1918542 2593 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2594 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2595 return -1;
c159d30c 2596
1da177e4
LT		 2597 return 0;
2598}
2599
f3db4851 2600void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2601{
8ed67789
DL		 2602 struct arg_dev_net adn = {
2603 .dev = dev,
2604 .net = net,
2605 };
2606
0c3584d5 2607 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2608 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2609 if (dev)
2610 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2611}
2612
95c96174 2613struct rt6_mtu_change_arg {
1da177e4 2614 struct net_device *dev;
95c96174 2615 unsigned int mtu;
1da177e4
LT		 2616};
2617
2618static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2619{
2620 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2621 struct inet6_dev *idev;
2622
2623 /* In IPv6 pmtu discovery is not optional,
2624 so that RTAX_MTU lock cannot disable it.
2625 We still use this lock to block changes
2626 caused by addrconf/ndisc.
2627 */
2628
2629 idev = __in6_dev_get(arg->dev);
38308473 2630 if (!idev)
1da177e4
LT		 2631 return 0;
2632
2633 /* For administrative MTU increase, there is no way to discover
2634 IPv6 PMTU increase, so PMTU increase should be updated here.
2635 Since RFC 1981 doesn't include administrative MTU increase
2636 update PMTU increase is a MUST. (i.e. jumbo frame)
2637 */
2638 /*
2639 If new MTU is less than route PMTU, this new MTU will be the
2640 lowest MTU in the path, update the route PMTU to reflect PMTU
2641 decreases; if new MTU is greater than route PMTU, and the
2642 old MTU is the lowest MTU in the path, update the route PMTU
2643 to reflect the increase. In this case if the other nodes' MTU
2644 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2645 PMTU discouvery.
2646 */
d1918542 2647 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2648 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2649 if (rt->rt6i_flags & RTF_CACHE) {
2650 /* For RTF_CACHE with rt6i_pmtu == 0
2651 * (i.e. a redirected route),
2652 * the metrics of its rt->dst.from has already
2653 * been updated.
2654 */
2655 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2656 rt->rt6i_pmtu = arg->mtu;
2657 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2658 (dst_mtu(&rt->dst) < arg->mtu &&
2659 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2660 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2661 }
566cfd8f 2662 }
1da177e4
LT		 2663 return 0;
2664}
2665
95c96174 2666void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2667{
c71099ac
TG		 2668 struct rt6_mtu_change_arg arg = {
2669 .dev = dev,
2670 .mtu = mtu,
2671 };
1da177e4 2672
0c3584d5 2673 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2674}
2675
ef7c79ed 2676static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2677 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2678 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2679 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2680 [RTA_PRIORITY] = { .type = NLA_U32 },
2681 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2682 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2683 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2684 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2685 [RTA_ENCAP] = { .type = NLA_NESTED },
86872cb5
TG		 2686};
2687
2688static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2689 struct fib6_config *cfg)
1da177e4 2690{
86872cb5
TG		 2691 struct rtmsg *rtm;
2692 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2693 unsigned int pref;
86872cb5 2694 int err;
1da177e4 2695
86872cb5
TG		 2696 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2697 if (err < 0)
2698 goto errout;
1da177e4 2699
86872cb5
TG		 2700 err = -EINVAL;
2701 rtm = nlmsg_data(nlh);
2702 memset(cfg, 0, sizeof(*cfg));
2703
2704 cfg->fc_table = rtm->rtm_table;
2705 cfg->fc_dst_len = rtm->rtm_dst_len;
2706 cfg->fc_src_len = rtm->rtm_src_len;
2707 cfg->fc_flags = RTF_UP;
2708 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2709 cfg->fc_type = rtm->rtm_type;
86872cb5 2710
ef2c7d7b
ND		 2711 if (rtm->rtm_type == RTN_UNREACHABLE ||
2712 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2713 rtm->rtm_type == RTN_PROHIBIT ||
2714 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2715 cfg->fc_flags |= RTF_REJECT;
2716
ab79ad14
MŻ		 2717 if (rtm->rtm_type == RTN_LOCAL)
2718 cfg->fc_flags |= RTF_LOCAL;
2719
1f56a01f
MKL		 2720 if (rtm->rtm_flags & RTM_F_CLONED)
2721 cfg->fc_flags |= RTF_CACHE;
2722
15e47304 2723 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2724 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2725 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2726
2727 if (tb[RTA_GATEWAY]) {
67b61f6c 2728 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2729 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2730 }
86872cb5
TG		 2731
2732 if (tb[RTA_DST]) {
2733 int plen = (rtm->rtm_dst_len + 7) >> 3;
2734
2735 if (nla_len(tb[RTA_DST]) < plen)
2736 goto errout;
2737
2738 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2739 }
86872cb5
TG		 2740
2741 if (tb[RTA_SRC]) {
2742 int plen = (rtm->rtm_src_len + 7) >> 3;
2743
2744 if (nla_len(tb[RTA_SRC]) < plen)
2745 goto errout;
2746
2747 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2748 }
86872cb5 2749
c3968a85 2750 if (tb[RTA_PREFSRC])
67b61f6c 2751 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2752
86872cb5
TG		 2753 if (tb[RTA_OIF])
2754 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2755
2756 if (tb[RTA_PRIORITY])
2757 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2758
2759 if (tb[RTA_METRICS]) {
2760 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2761 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2762 }
86872cb5
TG		 2763
2764 if (tb[RTA_TABLE])
2765 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2766
51ebd318
ND		 2767 if (tb[RTA_MULTIPATH]) {
2768 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2769 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2770 }
2771
c78ba6d6
LR		 2772 if (tb[RTA_PREF]) {
2773 pref = nla_get_u8(tb[RTA_PREF]);
2774 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2775 pref != ICMPV6_ROUTER_PREF_HIGH)
2776 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2777 cfg->fc_flags |= RTF_PREF(pref);
2778 }
2779
19e42e45
RP		 2780 if (tb[RTA_ENCAP])
2781 cfg->fc_encap = tb[RTA_ENCAP];
2782
2783 if (tb[RTA_ENCAP_TYPE])
2784 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2785
86872cb5
TG		 2786 err = 0;
2787errout:
2788 return err;
1da177e4
LT		 2789}
2790
6b9ea5a6
RP		 2791struct rt6_nh {
2792 struct rt6_info *rt6_info;
2793 struct fib6_config r_cfg;
2794 struct mx6_config mxc;
2795 struct list_head next;
2796};
2797
2798static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2799{
2800 struct rt6_nh *nh;
2801
2802 list_for_each_entry(nh, rt6_nh_list, next) {
2803 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2804 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2805 nh->r_cfg.fc_ifindex);
2806 }
2807}
2808
2809static int ip6_route_info_append(struct list_head *rt6_nh_list,
2810 struct rt6_info *rt, struct fib6_config *r_cfg)
2811{
2812 struct rt6_nh *nh;
2813 struct rt6_info *rtnh;
2814 int err = -EEXIST;
2815
2816 list_for_each_entry(nh, rt6_nh_list, next) {
2817 /* check if rt6_info already exists */
2818 rtnh = nh->rt6_info;
2819
2820 if (rtnh->dst.dev == rt->dst.dev &&
2821 rtnh->rt6i_idev == rt->rt6i_idev &&
2822 ipv6_addr_equal(&rtnh->rt6i_gateway,
2823 &rt->rt6i_gateway))
2824 return err;
2825 }
2826
2827 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2828 if (!nh)
2829 return -ENOMEM;
2830 nh->rt6_info = rt;
2831 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2832 if (err) {
2833 kfree(nh);
2834 return err;
2835 }
2836 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2837 list_add_tail(&nh->next, rt6_nh_list);
2838
2839 return 0;
2840}
2841
2842static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2843{
2844 struct fib6_config r_cfg;
2845 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2846 struct rt6_info *rt;
2847 struct rt6_nh *err_nh;
2848 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2849 int remaining;
2850 int attrlen;
6b9ea5a6
RP		 2851 int err = 1;
2852 int nhn = 0;
2853 int replace = (cfg->fc_nlinfo.nlh &&
2854 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2855 LIST_HEAD(rt6_nh_list);
51ebd318 2856
35f1b4e9 2857 remaining = cfg->fc_mp_len;
51ebd318 2858 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2859
6b9ea5a6
RP		 2860 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2861 * rt6_info structs per nexthop
2862 */
51ebd318
ND		 2863 while (rtnh_ok(rtnh, remaining)) {
2864 memcpy(&r_cfg, cfg, sizeof(*cfg));
2865 if (rtnh->rtnh_ifindex)
2866 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2867
2868 attrlen = rtnh_attrlen(rtnh);
2869 if (attrlen > 0) {
2870 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2871
2872 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2873 if (nla) {
67b61f6c 2874 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2875 r_cfg.fc_flags |= RTF_GATEWAY;
2876 }
19e42e45
RP		 2877 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2878 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2879 if (nla)
2880 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2881 }
6b9ea5a6 2882
8c5b83f0
RP		 2883 rt = ip6_route_info_create(&r_cfg);
2884 if (IS_ERR(rt)) {
2885 err = PTR_ERR(rt);
2886 rt = NULL;
6b9ea5a6 2887 goto cleanup;
8c5b83f0 2888 }
6b9ea5a6
RP		 2889
2890 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2891 if (err) {
6b9ea5a6
RP		 2892 dst_free(&rt->dst);
2893 goto cleanup;
2894 }
2895
2896 rtnh = rtnh_next(rtnh, &remaining);
2897 }
2898
2899 err_nh = NULL;
2900 list_for_each_entry(nh, &rt6_nh_list, next) {
2901 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2902 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2903 nh->rt6_info = NULL;
2904 if (err) {
2905 if (replace && nhn)
2906 ip6_print_replace_route_err(&rt6_nh_list);
2907 err_nh = nh;
2908 goto add_errout;
51ebd318 2909 }
6b9ea5a6 2910
1a72418b 2911 /* Because each route is added like a single route we remove
27596472
MK		 2912 * these flags after the first nexthop: if there is a collision,
2913 * we have already failed to add the first nexthop:
2914 * fib6_add_rt2node() has rejected it; when replacing, old
2915 * nexthops have been replaced by first new, the rest should
2916 * be added to it.
1a72418b 2917 */
27596472
MK		 2918 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2919 NLM_F_REPLACE);
6b9ea5a6
RP		 2920 nhn++;
2921 }
2922
2923 goto cleanup;
2924
2925add_errout:
2926 /* Delete routes that were already added */
2927 list_for_each_entry(nh, &rt6_nh_list, next) {
2928 if (err_nh == nh)
2929 break;
2930 ip6_route_del(&nh->r_cfg);
2931 }
2932
2933cleanup:
2934 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2935 if (nh->rt6_info)
2936 dst_free(&nh->rt6_info->dst);
52fe51f8 2937 kfree(nh->mxc.mx);
6b9ea5a6
RP		 2938 list_del(&nh->next);
2939 kfree(nh);
2940 }
2941
2942 return err;
2943}
2944
2945static int ip6_route_multipath_del(struct fib6_config *cfg)
2946{
2947 struct fib6_config r_cfg;
2948 struct rtnexthop *rtnh;
2949 int remaining;
2950 int attrlen;
2951 int err = 1, last_err = 0;
2952
2953 remaining = cfg->fc_mp_len;
2954 rtnh = (struct rtnexthop *)cfg->fc_mp;
2955
2956 /* Parse a Multipath Entry */
2957 while (rtnh_ok(rtnh, remaining)) {
2958 memcpy(&r_cfg, cfg, sizeof(*cfg));
2959 if (rtnh->rtnh_ifindex)
2960 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2961
2962 attrlen = rtnh_attrlen(rtnh);
2963 if (attrlen > 0) {
2964 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2965
2966 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2967 if (nla) {
2968 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2969 r_cfg.fc_flags |= RTF_GATEWAY;
2970 }
2971 }
2972 err = ip6_route_del(&r_cfg);
2973 if (err)
2974 last_err = err;
2975
51ebd318
ND		 2976 rtnh = rtnh_next(rtnh, &remaining);
2977 }
2978
2979 return last_err;
2980}
2981
67ba4152 2982static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2983{
86872cb5
TG		 2984 struct fib6_config cfg;
2985 int err;
1da177e4 2986
86872cb5
TG		 2987 err = rtm_to_fib6_config(skb, nlh, &cfg);
2988 if (err < 0)
2989 return err;
2990
51ebd318 2991 if (cfg.fc_mp)
6b9ea5a6 2992 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 2993 else
2994 return ip6_route_del(&cfg);
1da177e4
LT		 2995}
2996
67ba4152 2997static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2998{
86872cb5
TG		 2999 struct fib6_config cfg;
3000 int err;
1da177e4 3001
86872cb5
TG		 3002 err = rtm_to_fib6_config(skb, nlh, &cfg);
3003 if (err < 0)
3004 return err;
3005
51ebd318 3006 if (cfg.fc_mp)
6b9ea5a6 3007 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3008 else
3009 return ip6_route_add(&cfg);
1da177e4
LT		 3010}
3011
19e42e45 3012static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3013{
3014 return NLMSG_ALIGN(sizeof(struct rtmsg))
3015 + nla_total_size(16) /* RTA_SRC */
3016 + nla_total_size(16) /* RTA_DST */
3017 + nla_total_size(16) /* RTA_GATEWAY */
3018 + nla_total_size(16) /* RTA_PREFSRC */
3019 + nla_total_size(4) /* RTA_TABLE */
3020 + nla_total_size(4) /* RTA_IIF */
3021 + nla_total_size(4) /* RTA_OIF */
3022 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3023 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3024 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3025 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3026 + nla_total_size(1) /* RTA_PREF */
61adedf3 3027 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3028}
3029
191cd582
BH		 3030static int rt6_fill_node(struct net *net,
3031 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3032 struct in6_addr *dst, struct in6_addr *src,
15e47304 3033 int iif, int type, u32 portid, u32 seq,
7bc570c8 3034 int prefix, int nowait, unsigned int flags)
1da177e4 3035{
4b32b5ad 3036 u32 metrics[RTAX_MAX];
1da177e4 3037 struct rtmsg *rtm;
2d7202bf 3038 struct nlmsghdr *nlh;
e3703b3d 3039 long expires;
9e762a4a 3040 u32 table;
1da177e4
LT		 3041
3042 if (prefix) { /* user wants prefix routes only */
3043 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3044 /* success since this is not a prefix route */
3045 return 1;
3046 }
3047 }
3048
15e47304 3049 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3050 if (!nlh)
26932566 3051 return -EMSGSIZE;
2d7202bf
TG		 3052
3053 rtm = nlmsg_data(nlh);
1da177e4
LT		 3054 rtm->rtm_family = AF_INET6;
3055 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3056 rtm->rtm_src_len = rt->rt6i_src.plen;
3057 rtm->rtm_tos = 0;
c71099ac 3058 if (rt->rt6i_table)
9e762a4a 3059 table = rt->rt6i_table->tb6_id;
c71099ac 3060 else
9e762a4a
PM		 3061 table = RT6_TABLE_UNSPEC;
3062 rtm->rtm_table = table;
c78679e8
DM		 3063 if (nla_put_u32(skb, RTA_TABLE, table))
3064 goto nla_put_failure;
ef2c7d7b
ND		 3065 if (rt->rt6i_flags & RTF_REJECT) {
3066 switch (rt->dst.error) {
3067 case -EINVAL:
3068 rtm->rtm_type = RTN_BLACKHOLE;
3069 break;
3070 case -EACCES:
3071 rtm->rtm_type = RTN_PROHIBIT;
3072 break;
b4949ab2
ND		 3073 case -EAGAIN:
3074 rtm->rtm_type = RTN_THROW;
3075 break;
ef2c7d7b
ND		 3076 default:
3077 rtm->rtm_type = RTN_UNREACHABLE;
3078 break;
3079 }
3080 }
38308473 3081 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3082 rtm->rtm_type = RTN_LOCAL;
d1918542 3083 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3084 rtm->rtm_type = RTN_LOCAL;
3085 else
3086 rtm->rtm_type = RTN_UNICAST;
3087 rtm->rtm_flags = 0;
35103d11 3088 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3089 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3090 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3091 rtm->rtm_flags |= RTNH_F_DEAD;
3092 }
1da177e4
LT		 3093 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3094 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3095 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3096 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3097 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3098 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3099 rtm->rtm_protocol = RTPROT_RA;
3100 else
3101 rtm->rtm_protocol = RTPROT_KERNEL;
3102 }
1da177e4 3103
38308473 3104 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3105 rtm->rtm_flags |= RTM_F_CLONED;
3106
3107 if (dst) {
930345ea 3108 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3109 goto nla_put_failure;
1ab1457c 3110 rtm->rtm_dst_len = 128;
1da177e4 3111 } else if (rtm->rtm_dst_len)
930345ea 3112 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3113 goto nla_put_failure;
1da177e4
LT		 3114#ifdef CONFIG_IPV6_SUBTREES
3115 if (src) {
930345ea 3116 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3117 goto nla_put_failure;
1ab1457c 3118 rtm->rtm_src_len = 128;
c78679e8 3119 } else if (rtm->rtm_src_len &&
930345ea 3120 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3121 goto nla_put_failure;
1da177e4 3122#endif
7bc570c8
YH		 3123 if (iif) {
3124#ifdef CONFIG_IPV6_MROUTE
3125 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3126 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3127 if (err <= 0) {
3128 if (!nowait) {
3129 if (err == 0)
3130 return 0;
3131 goto nla_put_failure;
3132 } else {
3133 if (err == -EMSGSIZE)
3134 goto nla_put_failure;
3135 }
3136 }
3137 } else
3138#endif
c78679e8
DM		 3139 if (nla_put_u32(skb, RTA_IIF, iif))
3140 goto nla_put_failure;
7bc570c8 3141 } else if (dst) {
1da177e4 3142 struct in6_addr saddr_buf;
c78679e8 3143 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3144 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3145 goto nla_put_failure;
1da177e4 3146 }
2d7202bf 3147
c3968a85
DW		 3148 if (rt->rt6i_prefsrc.plen) {
3149 struct in6_addr saddr_buf;
4e3fd7a0 3150 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3151 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3152 goto nla_put_failure;
c3968a85
DW		 3153 }
3154
4b32b5ad
MKL		 3155 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3156 if (rt->rt6i_pmtu)
3157 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3158 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3159 goto nla_put_failure;
3160
dd0cbf29 3161 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3162 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3163 goto nla_put_failure;
94f826b8 3164 }
2d7202bf 3165
c78679e8
DM		 3166 if (rt->dst.dev &&
3167 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3168 goto nla_put_failure;
3169 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3170 goto nla_put_failure;
8253947e
LW		 3171
3172 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3173
87a50699 3174 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3175 goto nla_put_failure;
2d7202bf 3176
c78ba6d6
LR		 3177 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3178 goto nla_put_failure;
3179
61adedf3 3180 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3181
053c095a
JB		 3182 nlmsg_end(skb, nlh);
3183 return 0;
2d7202bf
TG		 3184
3185nla_put_failure:
26932566
PM		 3186 nlmsg_cancel(skb, nlh);
3187 return -EMSGSIZE;
1da177e4
LT		 3188}
3189
1b43af54 3190int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3191{
3192 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3193 int prefix;
3194
2d7202bf
TG		 3195 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3196 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3197 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3198 } else
3199 prefix = 0;
3200
191cd582
BH		 3201 return rt6_fill_node(arg->net,
3202 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3203 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3204 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3205}
3206
67ba4152 3207static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3208{
3b1e0a65 3209 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3210 struct nlattr *tb[RTA_MAX+1];
3211 struct rt6_info *rt;
1da177e4 3212 struct sk_buff *skb;
ab364a6f 3213 struct rtmsg *rtm;
4c9483b2 3214 struct flowi6 fl6;
72331bc0 3215 int err, iif = 0, oif = 0;
1da177e4 3216
ab364a6f
TG		 3217 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3218 if (err < 0)
3219 goto errout;
1da177e4 3220
ab364a6f 3221 err = -EINVAL;
4c9483b2 3222 memset(&fl6, 0, sizeof(fl6));
1da177e4 3223
ab364a6f
TG		 3224 if (tb[RTA_SRC]) {
3225 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3226 goto errout;
3227
4e3fd7a0 3228 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3229 }
3230
3231 if (tb[RTA_DST]) {
3232 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3233 goto errout;
3234
4e3fd7a0 3235 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3236 }
3237
3238 if (tb[RTA_IIF])
3239 iif = nla_get_u32(tb[RTA_IIF]);
3240
3241 if (tb[RTA_OIF])
72331bc0 3242 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3243
2e47b291
LC		 3244 if (tb[RTA_MARK])
3245 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3246
1da177e4
LT		 3247 if (iif) {
3248 struct net_device *dev;
72331bc0
SL		 3249 int flags = 0;
3250
5578689a 3251 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3252 if (!dev) {
3253 err = -ENODEV;
ab364a6f 3254 goto errout;
1da177e4 3255 }
72331bc0
SL		 3256
3257 fl6.flowi6_iif = iif;
3258
3259 if (!ipv6_addr_any(&fl6.saddr))
3260 flags |= RT6_LOOKUP_F_HAS_SADDR;
3261
3262 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3263 flags);
3264 } else {
3265 fl6.flowi6_oif = oif;
3266
ca254490
DA		 3267 if (netif_index_is_l3_master(net, oif)) {
3268 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3269 FLOWI_FLAG_SKIP_NH_OIF;
3270 }
3271
72331bc0 3272 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3273 }
3274
ab364a6f 3275 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3276 if (!skb) {
94e187c0 3277 ip6_rt_put(rt);
ab364a6f
TG		 3278 err = -ENOBUFS;
3279 goto errout;
3280 }
1da177e4 3281
ab364a6f
TG		 3282 /* Reserve room for dummy headers, this skb can pass
3283 through good chunk of routing engine.
3284 */
459a98ed 3285 skb_reset_mac_header(skb);
ab364a6f 3286 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3287
d8d1f30b 3288 skb_dst_set(skb, &rt->dst);
1da177e4 3289
4c9483b2 3290 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3291 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3292 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3293 if (err < 0) {
ab364a6f
TG		 3294 kfree_skb(skb);
3295 goto errout;
1da177e4
LT		 3296 }
3297
15e47304 3298 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3299errout:
1da177e4 3300 return err;
1da177e4
LT		 3301}
3302
37a1d361
RP		 3303void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3304 unsigned int nlm_flags)
1da177e4
LT		 3305{
3306 struct sk_buff *skb;
5578689a 3307 struct net *net = info->nl_net;
528c4ceb
DL		 3308 u32 seq;
3309 int err;
3310
3311 err = -ENOBUFS;
38308473 3312 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3313
19e42e45 3314 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3315 if (!skb)
21713ebc
TG		 3316 goto errout;
3317
191cd582 3318 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3319 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3320 if (err < 0) {
3321 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3322 WARN_ON(err == -EMSGSIZE);
3323 kfree_skb(skb);
3324 goto errout;
3325 }
15e47304 3326 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3327 info->nlh, gfp_any());
3328 return;
21713ebc
TG		 3329errout:
3330 if (err < 0)
5578689a 3331 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3332}
3333
8ed67789 3334static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3335 unsigned long event, void *ptr)
8ed67789 3336{
351638e7 3337 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3338 struct net *net = dev_net(dev);
8ed67789
DL		 3339
3340 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3341 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3342 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3343#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3344 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3345 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3346 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3347 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3348#endif
3349 }
3350
3351 return NOTIFY_OK;
3352}
3353
1da177e4
LT		 3354/*
3355 * /proc
3356 */
3357
3358#ifdef CONFIG_PROC_FS
3359
33120b30
AD		 3360static const struct file_operations ipv6_route_proc_fops = {
3361 .owner = THIS_MODULE,
3362 .open = ipv6_route_open,
3363 .read = seq_read,
3364 .llseek = seq_lseek,
8d2ca1d7 3365 .release = seq_release_net,
33120b30
AD		 3366};
3367
1da177e4
LT		 3368static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3369{
69ddb805 3370 struct net *net = (struct net *)seq->private;
1da177e4 3371 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3372 net->ipv6.rt6_stats->fib_nodes,
3373 net->ipv6.rt6_stats->fib_route_nodes,
3374 net->ipv6.rt6_stats->fib_rt_alloc,
3375 net->ipv6.rt6_stats->fib_rt_entries,
3376 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3377 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3378 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3379
3380 return 0;
3381}
3382
3383static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3384{
de05c557 3385 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3386}
3387
9a32144e 3388static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3389 .owner = THIS_MODULE,
3390 .open = rt6_stats_seq_open,
3391 .read = seq_read,
3392 .llseek = seq_lseek,
b6fcbdb4 3393 .release = single_release_net,
1da177e4
LT		 3394};
3395#endif /* CONFIG_PROC_FS */
3396
3397#ifdef CONFIG_SYSCTL
3398
1da177e4 3399static
fe2c6338 3400int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3401 void __user *buffer, size_t *lenp, loff_t *ppos)
3402{
c486da34
LAG		 3403 struct net *net;
3404 int delay;
3405 if (!write)
1da177e4 3406 return -EINVAL;
c486da34
LAG		 3407
3408 net = (struct net *)ctl->extra1;
3409 delay = net->ipv6.sysctl.flush_delay;
3410 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3411 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3412 return 0;
1da177e4
LT		 3413}
3414
fe2c6338 3415struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3416 {
1da177e4 3417 .procname = "flush",
4990509f 3418 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3419 .maxlen = sizeof(int),
89c8b3a1 3420 .mode = 0200,
6d9f239a 3421 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3422 },
3423 {
1da177e4 3424 .procname = "gc_thresh",
9a7ec3a9 3425 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3426 .maxlen = sizeof(int),
3427 .mode = 0644,
6d9f239a 3428 .proc_handler = proc_dointvec,
1da177e4
LT		 3429 },
3430 {
1da177e4 3431 .procname = "max_size",
4990509f 3432 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3433 .maxlen = sizeof(int),
3434 .mode = 0644,
6d9f239a 3435 .proc_handler = proc_dointvec,
1da177e4
LT		 3436 },
3437 {
1da177e4 3438 .procname = "gc_min_interval",
4990509f 3439 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3440 .maxlen = sizeof(int),
3441 .mode = 0644,
6d9f239a 3442 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3443 },
3444 {
1da177e4 3445 .procname = "gc_timeout",
4990509f 3446 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3447 .maxlen = sizeof(int),
3448 .mode = 0644,
6d9f239a 3449 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3450 },
3451 {
1da177e4 3452 .procname = "gc_interval",
4990509f 3453 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3454 .maxlen = sizeof(int),
3455 .mode = 0644,
6d9f239a 3456 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3457 },
3458 {
1da177e4 3459 .procname = "gc_elasticity",
4990509f 3460 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3461 .maxlen = sizeof(int),
3462 .mode = 0644,
f3d3f616 3463 .proc_handler = proc_dointvec,
1da177e4
LT		 3464 },
3465 {
1da177e4 3466 .procname = "mtu_expires",
4990509f 3467 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3468 .maxlen = sizeof(int),
3469 .mode = 0644,
6d9f239a 3470 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3471 },
3472 {
1da177e4 3473 .procname = "min_adv_mss",
4990509f 3474 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3475 .maxlen = sizeof(int),
3476 .mode = 0644,
f3d3f616 3477 .proc_handler = proc_dointvec,
1da177e4
LT		 3478 },
3479 {
1da177e4 3480 .procname = "gc_min_interval_ms",
4990509f 3481 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3482 .maxlen = sizeof(int),
3483 .mode = 0644,
6d9f239a 3484 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3485 },
f8572d8f 3486 { }
1da177e4
LT		 3487};
3488
2c8c1e72 3489struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3490{
3491 struct ctl_table *table;
3492
3493 table = kmemdup(ipv6_route_table_template,
3494 sizeof(ipv6_route_table_template),
3495 GFP_KERNEL);
5ee09105
YH		 3496
3497 if (table) {
3498 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3499 table[0].extra1 = net;
86393e52 3500 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3501 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3502 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3503 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3504 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3505 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3506 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3507 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3508 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3509
3510 /* Don't export sysctls to unprivileged users */
3511 if (net->user_ns != &init_user_ns)
3512 table[0].procname = NULL;
5ee09105
YH		 3513 }
3514
760f2d01
DL		 3515 return table;
3516}
1da177e4
LT		 3517#endif
3518
2c8c1e72 3519static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3520{
633d424b 3521 int ret = -ENOMEM;
8ed67789 3522
86393e52
AD		 3523 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3524 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3525
fc66f95c
ED		 3526 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3527 goto out_ip6_dst_ops;
3528
8ed67789
DL		 3529 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3530 sizeof(*net->ipv6.ip6_null_entry),
3531 GFP_KERNEL);
3532 if (!net->ipv6.ip6_null_entry)
fc66f95c 3533 goto out_ip6_dst_entries;
d8d1f30b 3534 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3535 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3536 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3537 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3538 ip6_template_metrics, true);
8ed67789
DL		 3539
3540#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3541 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3542 sizeof(*net->ipv6.ip6_prohibit_entry),
3543 GFP_KERNEL);
68fffc67
PZ		 3544 if (!net->ipv6.ip6_prohibit_entry)
3545 goto out_ip6_null_entry;
d8d1f30b 3546 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3547 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3548 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3549 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3550 ip6_template_metrics, true);
8ed67789
DL		 3551
3552 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3553 sizeof(*net->ipv6.ip6_blk_hole_entry),
3554 GFP_KERNEL);
68fffc67
PZ		 3555 if (!net->ipv6.ip6_blk_hole_entry)
3556 goto out_ip6_prohibit_entry;
d8d1f30b 3557 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3558 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3559 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3560 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3561 ip6_template_metrics, true);
8ed67789
DL		 3562#endif
3563
b339a47c
PZ		 3564 net->ipv6.sysctl.flush_delay = 0;
3565 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3566 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3567 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3568 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3569 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3570 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3571 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3572
6891a346
BT		 3573 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3574
8ed67789
DL		 3575 ret = 0;
3576out:
3577 return ret;
f2fc6a54 3578
68fffc67
PZ		 3579#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3580out_ip6_prohibit_entry:
3581 kfree(net->ipv6.ip6_prohibit_entry);
3582out_ip6_null_entry:
3583 kfree(net->ipv6.ip6_null_entry);
3584#endif
fc66f95c
ED		 3585out_ip6_dst_entries:
3586 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3587out_ip6_dst_ops:
f2fc6a54 3588 goto out;
cdb18761
DL		 3589}
3590
2c8c1e72 3591static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3592{
8ed67789
DL		 3593 kfree(net->ipv6.ip6_null_entry);
3594#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3595 kfree(net->ipv6.ip6_prohibit_entry);
3596 kfree(net->ipv6.ip6_blk_hole_entry);
3597#endif
41bb78b4 3598 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3599}
3600
d189634e
TG		 3601static int __net_init ip6_route_net_init_late(struct net *net)
3602{
3603#ifdef CONFIG_PROC_FS
d4beaa66
G		 3604 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3605 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3606#endif
3607 return 0;
3608}
3609
3610static void __net_exit ip6_route_net_exit_late(struct net *net)
3611{
3612#ifdef CONFIG_PROC_FS
ece31ffd
G		 3613 remove_proc_entry("ipv6_route", net->proc_net);
3614 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3615#endif
3616}
3617
cdb18761
DL		 3618static struct pernet_operations ip6_route_net_ops = {
3619 .init = ip6_route_net_init,
3620 .exit = ip6_route_net_exit,
3621};
3622
c3426b47
DM		 3623static int __net_init ipv6_inetpeer_init(struct net *net)
3624{
3625 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3626
3627 if (!bp)
3628 return -ENOMEM;
3629 inet_peer_base_init(bp);
3630 net->ipv6.peers = bp;
3631 return 0;
3632}
3633
3634static void __net_exit ipv6_inetpeer_exit(struct net *net)
3635{
3636 struct inet_peer_base *bp = net->ipv6.peers;
3637
3638 net->ipv6.peers = NULL;
56a6b248 3639 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3640 kfree(bp);
3641}
3642
2b823f72 3643static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3644 .init = ipv6_inetpeer_init,
3645 .exit = ipv6_inetpeer_exit,
3646};
3647
d189634e
TG		 3648static struct pernet_operations ip6_route_net_late_ops = {
3649 .init = ip6_route_net_init_late,
3650 .exit = ip6_route_net_exit_late,
3651};
3652
8ed67789
DL		 3653static struct notifier_block ip6_route_dev_notifier = {
3654 .notifier_call = ip6_route_dev_notify,
3655 .priority = 0,
3656};
3657
433d49c3 3658int __init ip6_route_init(void)
1da177e4 3659{
433d49c3 3660 int ret;
8d0b94af 3661 int cpu;
433d49c3 3662
9a7ec3a9
DL		 3663 ret = -ENOMEM;
3664 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3665 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3666 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3667 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3668 goto out;
14e50e57 3669
fc66f95c 3670 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3671 if (ret)
bdb3289f 3672 goto out_kmem_cache;
bdb3289f 3673
c3426b47
DM		 3674 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3675 if (ret)
e8803b6c 3676 goto out_dst_entries;
2a0c451a 3677
7e52b33b
DM		 3678 ret = register_pernet_subsys(&ip6_route_net_ops);
3679 if (ret)
3680 goto out_register_inetpeer;
c3426b47 3681
5dc121e9
AE		 3682 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3683
8ed67789
DL		 3684 /* Registering of the loopback is done before this portion of code,
3685 * the loopback reference in rt6_info will not be taken, do it
3686 * manually for init_net */
d8d1f30b 3687 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3688 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3689 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3690 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3691 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3692 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3693 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3694 #endif
e8803b6c 3695 ret = fib6_init();
433d49c3 3696 if (ret)
8ed67789 3697 goto out_register_subsys;
433d49c3 3698
433d49c3
DL		 3699 ret = xfrm6_init();
3700 if (ret)
e8803b6c 3701 goto out_fib6_init;
c35b7e72 3702
433d49c3
DL		 3703 ret = fib6_rules_init();
3704 if (ret)
3705 goto xfrm6_init;
7e5449c2 3706
d189634e
TG		 3707 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3708 if (ret)
3709 goto fib6_rules_init;
3710
433d49c3 3711 ret = -ENOBUFS;
c7ac8679
GR		 3712 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3713 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3714 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3715 goto out_register_late_subsys;
c127ea2c 3716
8ed67789 3717 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3718 if (ret)
d189634e 3719 goto out_register_late_subsys;
8ed67789 3720
8d0b94af
MKL		 3721 for_each_possible_cpu(cpu) {
3722 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3723
3724 INIT_LIST_HEAD(&ul->head);
3725 spin_lock_init(&ul->lock);
3726 }
3727
433d49c3
DL		 3728out:
3729 return ret;
3730
d189634e
TG		 3731out_register_late_subsys:
3732 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3733fib6_rules_init:
433d49c3
DL		 3734 fib6_rules_cleanup();
3735xfrm6_init:
433d49c3 3736 xfrm6_fini();
2a0c451a
TG		 3737out_fib6_init:
3738 fib6_gc_cleanup();
8ed67789
DL		 3739out_register_subsys:
3740 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3741out_register_inetpeer:
3742 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3743out_dst_entries:
3744 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3745out_kmem_cache:
f2fc6a54 3746 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3747 goto out;
1da177e4
LT		 3748}
3749
3750void ip6_route_cleanup(void)
3751{
8ed67789 3752 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3753 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3754 fib6_rules_cleanup();
1da177e4 3755 xfrm6_fini();
1da177e4 3756 fib6_gc_cleanup();
c3426b47 3757 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3758 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3759 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3760 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3761}
Linux kernel - Deliverables
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