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Merge branch 'mlx5-fixes'
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / route.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1da177e4
LT		 8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14/* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
c0bece9f
YH		 23 * Ville Nuorvala
24 * Fixed routing subtrees.
1da177e4
LT		 25 */
26
f3213831
JP		 27#define pr_fmt(fmt) "IPv6: " fmt
28
4fc268d2 29#include <linux/capability.h>
1da177e4 30#include <linux/errno.h>
bc3b2d7f 31#include <linux/export.h>
1da177e4
LT		 32#include <linux/types.h>
33#include <linux/times.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/net.h>
37#include <linux/route.h>
38#include <linux/netdevice.h>
39#include <linux/in6.h>
7bc570c8 40#include <linux/mroute6.h>
1da177e4 41#include <linux/init.h>
1da177e4 42#include <linux/if_arp.h>
1da177e4
LT		 43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
5b7c931d 45#include <linux/nsproxy.h>
5a0e3ad6 46#include <linux/slab.h>
457c4cbc 47#include <net/net_namespace.h>
1da177e4
LT		 48#include <net/snmp.h>
49#include <net/ipv6.h>
50#include <net/ip6_fib.h>
51#include <net/ip6_route.h>
52#include <net/ndisc.h>
53#include <net/addrconf.h>
54#include <net/tcp.h>
55#include <linux/rtnetlink.h>
56#include <net/dst.h>
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>
b811580d 65#include <trace/events/fib6.h>
1da177e4
LT		 66
67#include <asm/uaccess.h>
68
69#ifdef CONFIG_SYSCTL
70#include <linux/sysctl.h>
71#endif
72
afc154e9 73enum rt6_nud_state {
7e980569
JB		 74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 77 RT6_NUD_SUCCEED = 1
78};
79
83a09abd 80static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
1da177e4 81static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 82static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 83static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 84static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85static void ip6_dst_destroy(struct dst_entry *);
86static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
569d3645 88static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 89
90static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 91static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 92static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 93static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 94static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 95static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
4b32b5ad 99static void rt6_dst_from_metrics_check(struct rt6_info *rt);
52bd4c0c 100static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 101
70ceb4f5 102#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 103static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex,
95c96174 106 unsigned int pref);
efa2cea0 107static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 108 const struct in6_addr *prefix, int prefixlen,
109 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 110#endif
111
8d0b94af
MKL		 112struct uncached_list {
113 spinlock_t lock;
114 struct list_head head;
115};
116
117static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118
119static void rt6_uncached_list_add(struct rt6_info *rt)
120{
121 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122
123 rt->dst.flags |= DST_NOCACHE;
124 rt->rt6i_uncached_list = ul;
125
126 spin_lock_bh(&ul->lock);
127 list_add_tail(&rt->rt6i_uncached, &ul->head);
128 spin_unlock_bh(&ul->lock);
129}
130
131static void rt6_uncached_list_del(struct rt6_info *rt)
132{
133 if (!list_empty(&rt->rt6i_uncached)) {
134 struct uncached_list *ul = rt->rt6i_uncached_list;
135
136 spin_lock_bh(&ul->lock);
137 list_del(&rt->rt6i_uncached);
138 spin_unlock_bh(&ul->lock);
139 }
140}
141
142static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143{
144 struct net_device *loopback_dev = net->loopback_dev;
145 int cpu;
146
e332bc67
EB		 147 if (dev == loopback_dev)
148 return;
149
8d0b94af
MKL		 150 for_each_possible_cpu(cpu) {
151 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 struct rt6_info *rt;
153
154 spin_lock_bh(&ul->lock);
155 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
156 struct inet6_dev *rt_idev = rt->rt6i_idev;
157 struct net_device *rt_dev = rt->dst.dev;
158
e332bc67 159 if (rt_idev->dev == dev) {
8d0b94af
MKL		 160 rt->rt6i_idev = in6_dev_get(loopback_dev);
161 in6_dev_put(rt_idev);
162 }
163
e332bc67 164 if (rt_dev == dev) {
8d0b94af
MKL		 165 rt->dst.dev = loopback_dev;
166 dev_hold(rt->dst.dev);
167 dev_put(rt_dev);
168 }
169 }
170 spin_unlock_bh(&ul->lock);
171 }
172}
173
d52d3997
MKL		 174static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175{
176 return dst_metrics_write_ptr(rt->dst.from);
177}
178
06582540
DM		 179static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180{
4b32b5ad 181 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 182
d52d3997
MKL		 183 if (rt->rt6i_flags & RTF_PCPU)
184 return rt6_pcpu_cow_metrics(rt);
185 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 186 return NULL;
187 else
3b471175 188 return dst_cow_metrics_generic(dst, old);
06582540
DM		 189}
190
f894cbf8
DM		 191static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct sk_buff *skb,
193 const void *daddr)
39232973
DM		 194{
195 struct in6_addr *p = &rt->rt6i_gateway;
196
a7563f34 197 if (!ipv6_addr_any(p))
39232973 198 return (const void *) p;
f894cbf8
DM		 199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
39232973
DM		 201 return daddr;
202}
203
f894cbf8
DM		 204static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct sk_buff *skb,
206 const void *daddr)
d3aaeb38 207{
39232973
DM		 208 struct rt6_info *rt = (struct rt6_info *) dst;
209 struct neighbour *n;
210
f894cbf8 211 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 212 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 213 if (n)
214 return n;
215 return neigh_create(&nd_tbl, daddr, dst->dev);
216}
217
9a7ec3a9 218static struct dst_ops ip6_dst_ops_template = {
1da177e4 219 .family = AF_INET6,
1da177e4
LT		 220 .gc = ip6_dst_gc,
221 .gc_thresh = 1024,
222 .check = ip6_dst_check,
0dbaee3b 223 .default_advmss = ip6_default_advmss,
ebb762f2 224 .mtu = ip6_mtu,
06582540 225 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 226 .destroy = ip6_dst_destroy,
227 .ifdown = ip6_dst_ifdown,
228 .negative_advice = ip6_negative_advice,
229 .link_failure = ip6_link_failure,
230 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 231 .redirect = rt6_do_redirect,
9f8955cc 232 .local_out = __ip6_local_out,
d3aaeb38 233 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 234};
235
ebb762f2 236static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 237{
618f9bc7
SK		 238 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239
240 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 241}
242
6700c270
DM		 243static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 245{
246}
247
6700c270
DM		 248static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
249 struct sk_buff *skb)
b587ee3b
DM		 250{
251}
252
14e50e57
DM		 253static struct dst_ops ip6_dst_blackhole_ops = {
254 .family = AF_INET6,
14e50e57
DM		 255 .destroy = ip6_dst_destroy,
256 .check = ip6_dst_check,
ebb762f2 257 .mtu = ip6_blackhole_mtu,
214f45c9 258 .default_advmss = ip6_default_advmss,
14e50e57 259 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 260 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 261 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 262 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 263};
264
62fa8a84 265static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 266 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 267};
268
fb0af4c7 269static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 270 .dst = {
271 .__refcnt = ATOMIC_INIT(1),
272 .__use = 1,
2c20cbd7 273 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 274 .error = -ENETUNREACH,
d8d1f30b
CG		 275 .input = ip6_pkt_discard,
276 .output = ip6_pkt_discard_out,
1da177e4
LT		 277 },
278 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 279 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 280 .rt6i_metric = ~(u32) 0,
281 .rt6i_ref = ATOMIC_INIT(1),
282};
283
101367c2
TG		 284#ifdef CONFIG_IPV6_MULTIPLE_TABLES
285
fb0af4c7 286static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
2c20cbd7 290 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 291 .error = -EACCES,
d8d1f30b
CG		 292 .input = ip6_pkt_prohibit,
293 .output = ip6_pkt_prohibit_out,
101367c2
TG		 294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 296 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299};
300
fb0af4c7 301static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
2c20cbd7 305 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 306 .error = -EINVAL,
d8d1f30b 307 .input = dst_discard,
ede2059d 308 .output = dst_discard_out,
101367c2
TG		 309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 311 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 312 .rt6i_metric = ~(u32) 0,
313 .rt6i_ref = ATOMIC_INIT(1),
314};
315
316#endif
317
ebfa45f0
MKL		 318static void rt6_info_init(struct rt6_info *rt)
319{
320 struct dst_entry *dst = &rt->dst;
321
322 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
323 INIT_LIST_HEAD(&rt->rt6i_siblings);
324 INIT_LIST_HEAD(&rt->rt6i_uncached);
325}
326
1da177e4 327/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 328static struct rt6_info *__ip6_dst_alloc(struct net *net,
329 struct net_device *dev,
ad706862 330 int flags)
1da177e4 331{
97bab73f 332 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 333 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 334
ebfa45f0
MKL		 335 if (rt)
336 rt6_info_init(rt);
8104891b 337
cf911662 338 return rt;
1da177e4
LT		 339}
340
9ab179d8
DA		 341struct rt6_info *ip6_dst_alloc(struct net *net,
342 struct net_device *dev,
343 int flags)
d52d3997 344{
ad706862 345 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 346
347 if (rt) {
348 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
349 if (rt->rt6i_pcpu) {
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 struct rt6_info **p;
354
355 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
356 /* no one shares rt */
357 *p = NULL;
358 }
359 } else {
360 dst_destroy((struct dst_entry *)rt);
361 return NULL;
362 }
363 }
364
365 return rt;
366}
9ab179d8 367EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 368
1da177e4
LT		 369static void ip6_dst_destroy(struct dst_entry *dst)
370{
371 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 372 struct dst_entry *from = dst->from;
8d0b94af 373 struct inet6_dev *idev;
1da177e4 374
4b32b5ad 375 dst_destroy_metrics_generic(dst);
87775312 376 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 377 rt6_uncached_list_del(rt);
378
379 idev = rt->rt6i_idev;
38308473 380 if (idev) {
1da177e4
LT		 381 rt->rt6i_idev = NULL;
382 in6_dev_put(idev);
1ab1457c 383 }
1716a961 384
ecd98837
YH		 385 dst->from = NULL;
386 dst_release(from);
b3419363
DM		 387}
388
1da177e4
LT		 389static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
390 int how)
391{
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 394 struct net_device *loopback_dev =
c346dca1 395 dev_net(dev)->loopback_dev;
1da177e4 396
97cac082
DM		 397 if (dev != loopback_dev) {
398 if (idev && idev->dev == dev) {
399 struct inet6_dev *loopback_idev =
400 in6_dev_get(loopback_dev);
401 if (loopback_idev) {
402 rt->rt6i_idev = loopback_idev;
403 in6_dev_put(idev);
404 }
405 }
1da177e4
LT		 406 }
407}
408
5973fb1e
MKL		 409static bool __rt6_check_expired(const struct rt6_info *rt)
410{
411 if (rt->rt6i_flags & RTF_EXPIRES)
412 return time_after(jiffies, rt->dst.expires);
413 else
414 return false;
415}
416
a50feda5 417static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 418{
1716a961
G		 419 if (rt->rt6i_flags & RTF_EXPIRES) {
420 if (time_after(jiffies, rt->dst.expires))
a50feda5 421 return true;
1716a961 422 } else if (rt->dst.from) {
3fd91fb3 423 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 424 }
a50feda5 425 return false;
1da177e4
LT		 426}
427
51ebd318
ND		 428/* Multipath route selection:
429 * Hash based function using packet header and flowlabel.
430 * Adapted from fib_info_hashfn()
431 */
432static int rt6_info_hash_nhsfn(unsigned int candidate_count,
433 const struct flowi6 *fl6)
434{
644d0e65 435 return get_hash_from_flowi6(fl6) % candidate_count;
51ebd318
ND		 436}
437
438static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 439 struct flowi6 *fl6, int oif,
440 int strict)
51ebd318
ND		 441{
442 struct rt6_info *sibling, *next_sibling;
443 int route_choosen;
444
445 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
446 /* Don't change the route, if route_choosen == 0
447 * (siblings does not include ourself)
448 */
449 if (route_choosen)
450 list_for_each_entry_safe(sibling, next_sibling,
451 &match->rt6i_siblings, rt6i_siblings) {
452 route_choosen--;
453 if (route_choosen == 0) {
52bd4c0c
ND		 454 if (rt6_score_route(sibling, oif, strict) < 0)
455 break;
51ebd318
ND		 456 match = sibling;
457 break;
458 }
459 }
460 return match;
461}
462
1da177e4 463/*
c71099ac 464 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 465 */
466
8ed67789
DL		 467static inline struct rt6_info *rt6_device_match(struct net *net,
468 struct rt6_info *rt,
b71d1d42 469 const struct in6_addr *saddr,
1da177e4 470 int oif,
d420895e 471 int flags)
1da177e4
LT		 472{
473 struct rt6_info *local = NULL;
474 struct rt6_info *sprt;
475
dd3abc4e
YH		 476 if (!oif && ipv6_addr_any(saddr))
477 goto out;
478
d8d1f30b 479 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 480 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 481
482 if (oif) {
1da177e4
LT		 483 if (dev->ifindex == oif)
484 return sprt;
485 if (dev->flags & IFF_LOOPBACK) {
38308473 486 if (!sprt->rt6i_idev ||
1da177e4 487 sprt->rt6i_idev->dev->ifindex != oif) {
17fb0b2b 488 if (flags & RT6_LOOKUP_F_IFACE)
1da177e4 489 continue;
17fb0b2b
DA		 490 if (local &&
491 local->rt6i_idev->dev->ifindex == oif)
1da177e4
LT		 492 continue;
493 }
494 local = sprt;
495 }
dd3abc4e
YH		 496 } else {
497 if (ipv6_chk_addr(net, saddr, dev,
498 flags & RT6_LOOKUP_F_IFACE))
499 return sprt;
1da177e4 500 }
dd3abc4e 501 }
1da177e4 502
dd3abc4e 503 if (oif) {
1da177e4
LT		 504 if (local)
505 return local;
506
d420895e 507 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 508 return net->ipv6.ip6_null_entry;
1da177e4 509 }
dd3abc4e 510out:
1da177e4
LT		 511 return rt;
512}
513
27097255 514#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 515struct __rt6_probe_work {
516 struct work_struct work;
517 struct in6_addr target;
518 struct net_device *dev;
519};
520
521static void rt6_probe_deferred(struct work_struct *w)
522{
523 struct in6_addr mcaddr;
524 struct __rt6_probe_work *work =
525 container_of(w, struct __rt6_probe_work, work);
526
527 addrconf_addr_solict_mult(&work->target, &mcaddr);
304d888b 528 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
c2f17e82 529 dev_put(work->dev);
662f5533 530 kfree(work);
c2f17e82
HFS		 531}
532
27097255
YH		 533static void rt6_probe(struct rt6_info *rt)
534{
990edb42 535 struct __rt6_probe_work *work;
f2c31e32 536 struct neighbour *neigh;
27097255
YH		 537 /*
538 * Okay, this does not seem to be appropriate
539 * for now, however, we need to check if it
540 * is really so; aka Router Reachability Probing.
541 *
542 * Router Reachability Probe MUST be rate-limited
543 * to no more than one per minute.
544 */
2152caea 545 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 546 return;
2152caea
YH		 547 rcu_read_lock_bh();
548 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
549 if (neigh) {
8d6c31bf
MKL		 550 if (neigh->nud_state & NUD_VALID)
551 goto out;
552
990edb42 553 work = NULL;
2152caea 554 write_lock(&neigh->lock);
990edb42
MKL		 555 if (!(neigh->nud_state & NUD_VALID) &&
556 time_after(jiffies,
557 neigh->updated +
558 rt->rt6i_idev->cnf.rtr_probe_interval)) {
559 work = kmalloc(sizeof(*work), GFP_ATOMIC);
560 if (work)
561 __neigh_set_probe_once(neigh);
c2f17e82 562 }
2152caea 563 write_unlock(&neigh->lock);
990edb42
MKL		 564 } else {
565 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 566 }
990edb42
MKL		 567
568 if (work) {
569 INIT_WORK(&work->work, rt6_probe_deferred);
570 work->target = rt->rt6i_gateway;
571 dev_hold(rt->dst.dev);
572 work->dev = rt->dst.dev;
573 schedule_work(&work->work);
574 }
575
8d6c31bf 576out:
2152caea 577 rcu_read_unlock_bh();
27097255
YH		 578}
579#else
580static inline void rt6_probe(struct rt6_info *rt)
581{
27097255
YH		 582}
583#endif
584
1da177e4 585/*
554cfb7e 586 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 587 */
b6f99a21 588static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 589{
d1918542 590 struct net_device *dev = rt->dst.dev;
161980f4 591 if (!oif || dev->ifindex == oif)
554cfb7e 592 return 2;
161980f4
DM		 593 if ((dev->flags & IFF_LOOPBACK) &&
594 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
595 return 1;
596 return 0;
554cfb7e 597}
1da177e4 598
afc154e9 599static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 600{
f2c31e32 601 struct neighbour *neigh;
afc154e9 602 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 603
4d0c5911
YH		 604 if (rt->rt6i_flags & RTF_NONEXTHOP ||
605 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 606 return RT6_NUD_SUCCEED;
145a3621
YH		 607
608 rcu_read_lock_bh();
609 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
610 if (neigh) {
611 read_lock(&neigh->lock);
554cfb7e 612 if (neigh->nud_state & NUD_VALID)
afc154e9 613 ret = RT6_NUD_SUCCEED;
398bcbeb 614#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 615 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 616 ret = RT6_NUD_SUCCEED;
7e980569
JB		 617 else
618 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 619#endif
145a3621 620 read_unlock(&neigh->lock);
afc154e9
HFS		 621 } else {
622 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 623 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 624 }
145a3621
YH		 625 rcu_read_unlock_bh();
626
a5a81f0b 627 return ret;
1da177e4
LT		 628}
629
554cfb7e
YH		 630static int rt6_score_route(struct rt6_info *rt, int oif,
631 int strict)
1da177e4 632{
a5a81f0b 633 int m;
1ab1457c 634
4d0c5911 635 m = rt6_check_dev(rt, oif);
77d16f45 636 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 637 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 638#ifdef CONFIG_IPV6_ROUTER_PREF
639 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
640#endif
afc154e9
HFS		 641 if (strict & RT6_LOOKUP_F_REACHABLE) {
642 int n = rt6_check_neigh(rt);
643 if (n < 0)
644 return n;
645 }
554cfb7e
YH		 646 return m;
647}
648
f11e6659 649static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 650 int *mpri, struct rt6_info *match,
651 bool *do_rr)
554cfb7e 652{
f11e6659 653 int m;
afc154e9 654 bool match_do_rr = false;
35103d11
AG		 655 struct inet6_dev *idev = rt->rt6i_idev;
656 struct net_device *dev = rt->dst.dev;
657
658 if (dev && !netif_carrier_ok(dev) &&
659 idev->cnf.ignore_routes_with_linkdown)
660 goto out;
f11e6659
DM		 661
662 if (rt6_check_expired(rt))
663 goto out;
664
665 m = rt6_score_route(rt, oif, strict);
7e980569 666 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 667 match_do_rr = true;
668 m = 0; /* lowest valid score */
7e980569 669 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 670 goto out;
afc154e9
HFS		 671 }
672
673 if (strict & RT6_LOOKUP_F_REACHABLE)
674 rt6_probe(rt);
f11e6659 675
7e980569 676 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 677 if (m > *mpri) {
afc154e9 678 *do_rr = match_do_rr;
f11e6659
DM		 679 *mpri = m;
680 match = rt;
f11e6659 681 }
f11e6659
DM		 682out:
683 return match;
684}
685
686static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
687 struct rt6_info *rr_head,
afc154e9
HFS		 688 u32 metric, int oif, int strict,
689 bool *do_rr)
f11e6659 690{
9fbdcfaf 691 struct rt6_info *rt, *match, *cont;
554cfb7e 692 int mpri = -1;
1da177e4 693
f11e6659 694 match = NULL;
9fbdcfaf
SK		 695 cont = NULL;
696 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
697 if (rt->rt6i_metric != metric) {
698 cont = rt;
699 break;
700 }
701
702 match = find_match(rt, oif, strict, &mpri, match, do_rr);
703 }
704
705 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
706 if (rt->rt6i_metric != metric) {
707 cont = rt;
708 break;
709 }
710
afc154e9 711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 712 }
713
714 if (match || !cont)
715 return match;
716
717 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 719
f11e6659
DM		 720 return match;
721}
1da177e4 722
f11e6659
DM		 723static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
724{
725 struct rt6_info *match, *rt0;
8ed67789 726 struct net *net;
afc154e9 727 bool do_rr = false;
1da177e4 728
f11e6659
DM		 729 rt0 = fn->rr_ptr;
730 if (!rt0)
731 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 732
afc154e9
HFS		 733 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 &do_rr);
1da177e4 735
afc154e9 736 if (do_rr) {
d8d1f30b 737 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 738
554cfb7e 739 /* no entries matched; do round-robin */
f11e6659
DM		 740 if (!next || next->rt6i_metric != rt0->rt6i_metric)
741 next = fn->leaf;
742
743 if (next != rt0)
744 fn->rr_ptr = next;
1da177e4 745 }
1da177e4 746
d1918542 747 net = dev_net(rt0->dst.dev);
a02cec21 748 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 749}
750
8b9df265
MKL		 751static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
752{
753 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
754}
755
70ceb4f5
YH		 756#ifdef CONFIG_IPV6_ROUTE_INFO
757int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 758 const struct in6_addr *gwaddr)
70ceb4f5 759{
c346dca1 760 struct net *net = dev_net(dev);
70ceb4f5
YH		 761 struct route_info *rinfo = (struct route_info *) opt;
762 struct in6_addr prefix_buf, *prefix;
763 unsigned int pref;
4bed72e4 764 unsigned long lifetime;
70ceb4f5
YH		 765 struct rt6_info *rt;
766
767 if (len < sizeof(struct route_info)) {
768 return -EINVAL;
769 }
770
771 /* Sanity check for prefix_len and length */
772 if (rinfo->length > 3) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 128) {
775 return -EINVAL;
776 } else if (rinfo->prefix_len > 64) {
777 if (rinfo->length < 2) {
778 return -EINVAL;
779 }
780 } else if (rinfo->prefix_len > 0) {
781 if (rinfo->length < 1) {
782 return -EINVAL;
783 }
784 }
785
786 pref = rinfo->route_pref;
787 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 788 return -EINVAL;
70ceb4f5 789
4bed72e4 790 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 791
792 if (rinfo->length == 3)
793 prefix = (struct in6_addr *)rinfo->prefix;
794 else {
795 /* this function is safe */
796 ipv6_addr_prefix(&prefix_buf,
797 (struct in6_addr *)rinfo->prefix,
798 rinfo->prefix_len);
799 prefix = &prefix_buf;
800 }
801
f104a567
DJ		 802 if (rinfo->prefix_len == 0)
803 rt = rt6_get_dflt_router(gwaddr, dev);
804 else
805 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
806 gwaddr, dev->ifindex);
70ceb4f5
YH		 807
808 if (rt && !lifetime) {
e0a1ad73 809 ip6_del_rt(rt);
70ceb4f5
YH		 810 rt = NULL;
811 }
812
813 if (!rt && lifetime)
efa2cea0 814 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 815 pref);
816 else if (rt)
817 rt->rt6i_flags = RTF_ROUTEINFO |
818 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
819
820 if (rt) {
1716a961
G		 821 if (!addrconf_finite_timeout(lifetime))
822 rt6_clean_expires(rt);
823 else
824 rt6_set_expires(rt, jiffies + HZ * lifetime);
825
94e187c0 826 ip6_rt_put(rt);
70ceb4f5
YH		 827 }
828 return 0;
829}
830#endif
831
a3c00e46
MKL		 832static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
833 struct in6_addr *saddr)
834{
835 struct fib6_node *pn;
836 while (1) {
837 if (fn->fn_flags & RTN_TL_ROOT)
838 return NULL;
839 pn = fn->parent;
840 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
841 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
842 else
843 fn = pn;
844 if (fn->fn_flags & RTN_RTINFO)
845 return fn;
846 }
847}
c71099ac 848
8ed67789
DL		 849static struct rt6_info *ip6_pol_route_lookup(struct net *net,
850 struct fib6_table *table,
4c9483b2 851 struct flowi6 *fl6, int flags)
1da177e4
LT		 852{
853 struct fib6_node *fn;
854 struct rt6_info *rt;
855
c71099ac 856 read_lock_bh(&table->tb6_lock);
4c9483b2 857 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 858restart:
859 rt = fn->leaf;
4c9483b2 860 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 861 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 862 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 863 if (rt == net->ipv6.ip6_null_entry) {
864 fn = fib6_backtrack(fn, &fl6->saddr);
865 if (fn)
866 goto restart;
867 }
d8d1f30b 868 dst_use(&rt->dst, jiffies);
c71099ac 869 read_unlock_bh(&table->tb6_lock);
b811580d
DA		 870
871 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
872
c71099ac
TG		 873 return rt;
874
875}
876
67ba4152 877struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 878 int flags)
879{
880 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
881}
882EXPORT_SYMBOL_GPL(ip6_route_lookup);
883
9acd9f3a
YH		 884struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
885 const struct in6_addr *saddr, int oif, int strict)
c71099ac 886{
4c9483b2
DM		 887 struct flowi6 fl6 = {
888 .flowi6_oif = oif,
889 .daddr = *daddr,
c71099ac
TG		 890 };
891 struct dst_entry *dst;
77d16f45 892 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 893
adaa70bb 894 if (saddr) {
4c9483b2 895 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 896 flags |= RT6_LOOKUP_F_HAS_SADDR;
897 }
898
4c9483b2 899 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 900 if (dst->error == 0)
901 return (struct rt6_info *) dst;
902
903 dst_release(dst);
904
1da177e4
LT		 905 return NULL;
906}
7159039a
YH		 907EXPORT_SYMBOL(rt6_lookup);
908
c71099ac 909/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 910 It takes new route entry, the addition fails by any reason the
911 route is freed. In any case, if caller does not hold it, it may
912 be destroyed.
913 */
914
e5fd387a 915static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 916 struct mx6_config *mxc)
1da177e4
LT		 917{
918 int err;
c71099ac 919 struct fib6_table *table;
1da177e4 920
c71099ac
TG		 921 table = rt->rt6i_table;
922 write_lock_bh(&table->tb6_lock);
e715b6d3 923 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 924 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 925
926 return err;
927}
928
40e22e8f
TG		 929int ip6_ins_rt(struct rt6_info *rt)
930{
e715b6d3
FW		 931 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
932 struct mx6_config mxc = { .mx = NULL, };
933
934 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 935}
936
8b9df265
MKL		 937static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
938 const struct in6_addr *daddr,
939 const struct in6_addr *saddr)
1da177e4 940{
1da177e4
LT		 941 struct rt6_info *rt;
942
943 /*
944 * Clone the route.
945 */
946
d52d3997 947 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 948 ort = (struct rt6_info *)ort->dst.from;
1da177e4 949
ad706862 950 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 951
952 if (!rt)
953 return NULL;
954
955 ip6_rt_copy_init(rt, ort);
956 rt->rt6i_flags |= RTF_CACHE;
957 rt->rt6i_metric = 0;
958 rt->dst.flags |= DST_HOST;
959 rt->rt6i_dst.addr = *daddr;
960 rt->rt6i_dst.plen = 128;
1da177e4 961
83a09abd
MKL		 962 if (!rt6_is_gw_or_nonexthop(ort)) {
963 if (ort->rt6i_dst.plen != 128 &&
964 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
965 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 966#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 967 if (rt->rt6i_src.plen && saddr) {
968 rt->rt6i_src.addr = *saddr;
969 rt->rt6i_src.plen = 128;
8b9df265 970 }
83a09abd 971#endif
95a9a5ba 972 }
1da177e4 973
95a9a5ba
YH		 974 return rt;
975}
1da177e4 976
d52d3997
MKL		 977static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
978{
979 struct rt6_info *pcpu_rt;
980
981 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 982 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 983
984 if (!pcpu_rt)
985 return NULL;
986 ip6_rt_copy_init(pcpu_rt, rt);
987 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
988 pcpu_rt->rt6i_flags |= RTF_PCPU;
989 return pcpu_rt;
990}
991
992/* It should be called with read_lock_bh(&tb6_lock) acquired */
993static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
994{
a73e4195 995 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 996
997 p = this_cpu_ptr(rt->rt6i_pcpu);
998 pcpu_rt = *p;
999
a73e4195
MKL		 1000 if (pcpu_rt) {
1001 dst_hold(&pcpu_rt->dst);
1002 rt6_dst_from_metrics_check(pcpu_rt);
1003 }
1004 return pcpu_rt;
1005}
1006
1007static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1008{
9c7370a1 1009 struct fib6_table *table = rt->rt6i_table;
a73e4195 1010 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1011
1012 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1013 if (!pcpu_rt) {
1014 struct net *net = dev_net(rt->dst.dev);
1015
9c7370a1
MKL		 1016 dst_hold(&net->ipv6.ip6_null_entry->dst);
1017 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1018 }
1019
9c7370a1
MKL		 1020 read_lock_bh(&table->tb6_lock);
1021 if (rt->rt6i_pcpu) {
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 prev = cmpxchg(p, NULL, pcpu_rt);
1024 if (prev) {
1025 /* If someone did it before us, return prev instead */
1026 dst_destroy(&pcpu_rt->dst);
1027 pcpu_rt = prev;
1028 }
1029 } else {
1030 /* rt has been removed from the fib6 tree
1031 * before we have a chance to acquire the read_lock.
1032 * In this case, don't brother to create a pcpu rt
1033 * since rt is going away anyway. The next
1034 * dst_check() will trigger a re-lookup.
1035 */
d52d3997 1036 dst_destroy(&pcpu_rt->dst);
9c7370a1 1037 pcpu_rt = rt;
d52d3997 1038 }
d52d3997
MKL		 1039 dst_hold(&pcpu_rt->dst);
1040 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1041 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1042 return pcpu_rt;
1043}
1044
9ff74384
DA		 1045struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1046 int oif, struct flowi6 *fl6, int flags)
1da177e4 1047{
367efcb9 1048 struct fib6_node *fn, *saved_fn;
45e4fd26 1049 struct rt6_info *rt;
c71099ac 1050 int strict = 0;
1da177e4 1051
77d16f45 1052 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1055
c71099ac 1056 read_lock_bh(&table->tb6_lock);
1da177e4 1057
4c9483b2 1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1059 saved_fn = fn;
1da177e4 1060
ca254490
DA		 1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
a3c00e46 1064redo_rt6_select:
367efcb9 1065 rt = rt6_select(fn, oif, strict);
52bd4c0c 1066 if (rt->rt6i_nsiblings)
367efcb9 1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
367efcb9
MKL		 1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
367efcb9 1077 }
a3c00e46
MKL		 1078 }
1079
fb9de91e 1080
3da59bd9 1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
b811580d
DA		 1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
d52d3997 1088 return rt;
3da59bd9
MKL		 1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
d52d3997
MKL		 1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
3da59bd9
MKL		 1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
c71099ac 1104
3da59bd9 1105 if (uncached_rt)
8d0b94af 1106 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1109
3da59bd9 1110 dst_hold(&uncached_rt->dst);
b811580d
DA		 1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
3da59bd9 1113 return uncached_rt;
3da59bd9 1114
d52d3997
MKL		 1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1123
9c7370a1
MKL		 1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
a73e4195 1133 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1134 dst_release(&rt->dst);
1135 }
d52d3997 1136
b811580d 1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
d52d3997 1138 return pcpu_rt;
9c7370a1 1139
d52d3997 1140 }
1da177e4 1141}
9ff74384 1142EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 1143
8ed67789 1144static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1145 struct flowi6 *fl6, int flags)
4acad72d 1146{
4c9483b2 1147 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1148}
1149
72331bc0
SL		 1150static struct dst_entry *ip6_route_input_lookup(struct net *net,
1151 struct net_device *dev,
1152 struct flowi6 *fl6, int flags)
1153{
1154 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1155 flags |= RT6_LOOKUP_F_IFACE;
1156
1157 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1158}
1159
c71099ac
TG		 1160void ip6_route_input(struct sk_buff *skb)
1161{
b71d1d42 1162 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1163 struct net *net = dev_net(skb->dev);
adaa70bb 1164 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1165 struct ip_tunnel_info *tun_info;
4c9483b2 1166 struct flowi6 fl6 = {
ca254490 1167 .flowi6_iif = l3mdev_fib_oif(skb->dev),
4c9483b2
DM		 1168 .daddr = iph->daddr,
1169 .saddr = iph->saddr,
6502ca52 1170 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1171 .flowi6_mark = skb->mark,
1172 .flowi6_proto = iph->nexthdr,
c71099ac 1173 };
adaa70bb 1174
904af04d 1175 tun_info = skb_tunnel_info(skb);
46fa062a 1176 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1177 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1178 skb_dst_drop(skb);
72331bc0 1179 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1180}
1181
8ed67789 1182static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1183 struct flowi6 *fl6, int flags)
1da177e4 1184{
4c9483b2 1185 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1186}
1187
6f21c96a
PA		 1188struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1189 struct flowi6 *fl6, int flags)
c71099ac 1190{
ca254490 1191 struct dst_entry *dst;
d46a9d67 1192 bool any_src;
c71099ac 1193
4a65896f 1194 dst = l3mdev_get_rt6_dst(net, fl6);
ca254490
DA		 1195 if (dst)
1196 return dst;
1197
1fb9489b 1198 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1199
d46a9d67 1200 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1201 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1202 (fl6->flowi6_oif && any_src))
77d16f45 1203 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1204
d46a9d67 1205 if (!any_src)
adaa70bb 1206 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1207 else if (sk)
1208 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1209
4c9483b2 1210 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1211}
6f21c96a 1212EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 1213
2774c131 1214struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1215{
5c1e6aa3 1216 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1217 struct dst_entry *new = NULL;
1218
f5b0a874 1219 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1220 if (rt) {
0a1f5962 1221 rt6_info_init(rt);
8104891b 1222
0a1f5962 1223 new = &rt->dst;
14e50e57 1224 new->__use = 1;
352e512c 1225 new->input = dst_discard;
ede2059d 1226 new->output = dst_discard_out;
14e50e57 1227
0a1f5962 1228 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1229 rt->rt6i_idev = ort->rt6i_idev;
1230 if (rt->rt6i_idev)
1231 in6_dev_hold(rt->rt6i_idev);
14e50e57 1232
4e3fd7a0 1233 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1234 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1235 rt->rt6i_metric = 0;
1236
1237 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1238#ifdef CONFIG_IPV6_SUBTREES
1239 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1240#endif
1241
1242 dst_free(new);
1243 }
1244
69ead7af
DM		 1245 dst_release(dst_orig);
1246 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1247}
14e50e57 1248
1da177e4
LT		 1249/*
1250 * Destination cache support functions
1251 */
1252
4b32b5ad
MKL		 1253static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1254{
1255 if (rt->dst.from &&
1256 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1257 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1258}
1259
3da59bd9
MKL		 1260static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1261{
1262 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1263 return NULL;
1264
1265 if (rt6_check_expired(rt))
1266 return NULL;
1267
1268 return &rt->dst;
1269}
1270
1271static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1272{
5973fb1e
MKL		 1273 if (!__rt6_check_expired(rt) &&
1274 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
3da59bd9
MKL		 1275 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1276 return &rt->dst;
1277 else
1278 return NULL;
1279}
1280
1da177e4
LT		 1281static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1282{
1283 struct rt6_info *rt;
1284
1285 rt = (struct rt6_info *) dst;
1286
6f3118b5
ND		 1287 /* All IPV6 dsts are created with ->obsolete set to the value
1288 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1289 * into this function always.
1290 */
e3bc10bd 1291
4b32b5ad
MKL		 1292 rt6_dst_from_metrics_check(rt);
1293
02bcf4e0
MKL		 1294 if (rt->rt6i_flags & RTF_PCPU ||
1295 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
3da59bd9
MKL		 1296 return rt6_dst_from_check(rt, cookie);
1297 else
1298 return rt6_check(rt, cookie);
1da177e4
LT		 1299}
1300
1301static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1302{
1303 struct rt6_info *rt = (struct rt6_info *) dst;
1304
1305 if (rt) {
54c1a859
YH		 1306 if (rt->rt6i_flags & RTF_CACHE) {
1307 if (rt6_check_expired(rt)) {
1308 ip6_del_rt(rt);
1309 dst = NULL;
1310 }
1311 } else {
1da177e4 1312 dst_release(dst);
54c1a859
YH		 1313 dst = NULL;
1314 }
1da177e4 1315 }
54c1a859 1316 return dst;
1da177e4
LT		 1317}
1318
1319static void ip6_link_failure(struct sk_buff *skb)
1320{
1321 struct rt6_info *rt;
1322
3ffe533c 1323 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1324
adf30907 1325 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1326 if (rt) {
1eb4f758
HFS		 1327 if (rt->rt6i_flags & RTF_CACHE) {
1328 dst_hold(&rt->dst);
8e3d5be7 1329 ip6_del_rt(rt);
1eb4f758 1330 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1331 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1332 }
1da177e4
LT		 1333 }
1334}
1335
45e4fd26
MKL		 1336static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1337{
1338 struct net *net = dev_net(rt->dst.dev);
1339
1340 rt->rt6i_flags |= RTF_MODIFIED;
1341 rt->rt6i_pmtu = mtu;
1342 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1343}
1344
0d3f6d29
MKL		 1345static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1346{
1347 return !(rt->rt6i_flags & RTF_CACHE) &&
1348 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1349}
1350
45e4fd26
MKL		 1351static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1352 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1353{
67ba4152 1354 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1355
45e4fd26
MKL		 1356 if (rt6->rt6i_flags & RTF_LOCAL)
1357 return;
81aded24 1358
45e4fd26
MKL		 1359 dst_confirm(dst);
1360 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1361 if (mtu >= dst_mtu(dst))
1362 return;
9d289715 1363
0d3f6d29 1364 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26
MKL		 1365 rt6_do_update_pmtu(rt6, mtu);
1366 } else {
1367 const struct in6_addr *daddr, *saddr;
1368 struct rt6_info *nrt6;
1369
1370 if (iph) {
1371 daddr = &iph->daddr;
1372 saddr = &iph->saddr;
1373 } else if (sk) {
1374 daddr = &sk->sk_v6_daddr;
1375 saddr = &inet6_sk(sk)->saddr;
1376 } else {
1377 return;
1378 }
1379 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1380 if (nrt6) {
1381 rt6_do_update_pmtu(nrt6, mtu);
1382
1383 /* ip6_ins_rt(nrt6) will bump the
1384 * rt6->rt6i_node->fn_sernum
1385 * which will fail the next rt6_check() and
1386 * invalidate the sk->sk_dst_cache.
1387 */
1388 ip6_ins_rt(nrt6);
1389 }
1da177e4
LT		 1390 }
1391}
1392
45e4fd26
MKL		 1393static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1394 struct sk_buff *skb, u32 mtu)
1395{
1396 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1397}
1398
42ae66c8
DM		 1399void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1400 int oif, u32 mark)
81aded24
DM		 1401{
1402 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1403 struct dst_entry *dst;
1404 struct flowi6 fl6;
1405
1406 memset(&fl6, 0, sizeof(fl6));
1407 fl6.flowi6_oif = oif;
1b3c61dc 1408 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1409 fl6.daddr = iph->daddr;
1410 fl6.saddr = iph->saddr;
6502ca52 1411 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1412
1413 dst = ip6_route_output(net, NULL, &fl6);
1414 if (!dst->error)
45e4fd26 1415 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1416 dst_release(dst);
1417}
1418EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1419
1420void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1421{
33c162a9
MKL		 1422 struct dst_entry *dst;
1423
81aded24
DM		 1424 ip6_update_pmtu(skb, sock_net(sk), mtu,
1425 sk->sk_bound_dev_if, sk->sk_mark);
33c162a9
MKL		 1426
1427 dst = __sk_dst_get(sk);
1428 if (!dst || !dst->obsolete ||
1429 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1430 return;
1431
1432 bh_lock_sock(sk);
1433 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1434 ip6_datagram_dst_update(sk, false);
1435 bh_unlock_sock(sk);
81aded24
DM		 1436}
1437EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1438
b55b76b2
DJ		 1439/* Handle redirects */
1440struct ip6rd_flowi {
1441 struct flowi6 fl6;
1442 struct in6_addr gateway;
1443};
1444
1445static struct rt6_info *__ip6_route_redirect(struct net *net,
1446 struct fib6_table *table,
1447 struct flowi6 *fl6,
1448 int flags)
1449{
1450 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1451 struct rt6_info *rt;
1452 struct fib6_node *fn;
1453
1454 /* Get the "current" route for this destination and
1455 * check if the redirect has come from approriate router.
1456 *
1457 * RFC 4861 specifies that redirects should only be
1458 * accepted if they come from the nexthop to the target.
1459 * Due to the way the routes are chosen, this notion
1460 * is a bit fuzzy and one might need to check all possible
1461 * routes.
1462 */
1463
1464 read_lock_bh(&table->tb6_lock);
1465 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1466restart:
1467 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1468 if (rt6_check_expired(rt))
1469 continue;
1470 if (rt->dst.error)
1471 break;
1472 if (!(rt->rt6i_flags & RTF_GATEWAY))
1473 continue;
1474 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1475 continue;
1476 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1477 continue;
1478 break;
1479 }
1480
1481 if (!rt)
1482 rt = net->ipv6.ip6_null_entry;
1483 else if (rt->dst.error) {
1484 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1485 goto out;
1486 }
1487
1488 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1489 fn = fib6_backtrack(fn, &fl6->saddr);
1490 if (fn)
1491 goto restart;
b55b76b2 1492 }
a3c00e46 1493
b0a1ba59 1494out:
b55b76b2
DJ		 1495 dst_hold(&rt->dst);
1496
1497 read_unlock_bh(&table->tb6_lock);
1498
b811580d 1499 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
b55b76b2
DJ		 1500 return rt;
1501};
1502
1503static struct dst_entry *ip6_route_redirect(struct net *net,
1504 const struct flowi6 *fl6,
1505 const struct in6_addr *gateway)
1506{
1507 int flags = RT6_LOOKUP_F_HAS_SADDR;
1508 struct ip6rd_flowi rdfl;
1509
1510 rdfl.fl6 = *fl6;
1511 rdfl.gateway = *gateway;
1512
1513 return fib6_rule_lookup(net, &rdfl.fl6,
1514 flags, __ip6_route_redirect);
1515}
1516
3a5ad2ee
DM		 1517void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1518{
1519 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1520 struct dst_entry *dst;
1521 struct flowi6 fl6;
1522
1523 memset(&fl6, 0, sizeof(fl6));
e374c618 1524 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1525 fl6.flowi6_oif = oif;
1526 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1527 fl6.daddr = iph->daddr;
1528 fl6.saddr = iph->saddr;
6502ca52 1529 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1530
b55b76b2
DJ		 1531 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1532 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1533 dst_release(dst);
1534}
1535EXPORT_SYMBOL_GPL(ip6_redirect);
1536
c92a59ec
DJ		 1537void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1538 u32 mark)
1539{
1540 const struct ipv6hdr *iph = ipv6_hdr(skb);
1541 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1542 struct dst_entry *dst;
1543 struct flowi6 fl6;
1544
1545 memset(&fl6, 0, sizeof(fl6));
e374c618 1546 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1547 fl6.flowi6_oif = oif;
1548 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1549 fl6.daddr = msg->dest;
1550 fl6.saddr = iph->daddr;
1551
b55b76b2
DJ		 1552 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1553 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1554 dst_release(dst);
1555}
1556
3a5ad2ee
DM		 1557void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1558{
1559 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1560}
1561EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1562
0dbaee3b 1563static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1564{
0dbaee3b
DM		 1565 struct net_device *dev = dst->dev;
1566 unsigned int mtu = dst_mtu(dst);
1567 struct net *net = dev_net(dev);
1568
1da177e4
LT		 1569 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1570
5578689a
DL		 1571 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1572 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1573
1574 /*
1ab1457c
YH		 1575 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1576 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1577 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1578 * rely only on pmtu discovery"
1579 */
1580 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1581 mtu = IPV6_MAXPLEN;
1582 return mtu;
1583}
1584
ebb762f2 1585static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1586{
4b32b5ad
MKL		 1587 const struct rt6_info *rt = (const struct rt6_info *)dst;
1588 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1589 struct inet6_dev *idev;
618f9bc7 1590
4b32b5ad
MKL		 1591 if (mtu)
1592 goto out;
1593
1594 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1595 if (mtu)
30f78d8e 1596 goto out;
618f9bc7
SK		 1597
1598 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1599
1600 rcu_read_lock();
1601 idev = __in6_dev_get(dst->dev);
1602 if (idev)
1603 mtu = idev->cnf.mtu6;
1604 rcu_read_unlock();
1605
30f78d8e
ED		 1606out:
1607 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1608}
1609
3b00944c
YH		 1610static struct dst_entry *icmp6_dst_gc_list;
1611static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1612
3b00944c 1613struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1614 struct flowi6 *fl6)
1da177e4 1615{
87a11578 1616 struct dst_entry *dst;
1da177e4
LT		 1617 struct rt6_info *rt;
1618 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1619 struct net *net = dev_net(dev);
1da177e4 1620
38308473 1621 if (unlikely(!idev))
122bdf67 1622 return ERR_PTR(-ENODEV);
1da177e4 1623
ad706862 1624 rt = ip6_dst_alloc(net, dev, 0);
38308473 1625 if (unlikely(!rt)) {
1da177e4 1626 in6_dev_put(idev);
87a11578 1627 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1628 goto out;
1629 }
1630
8e2ec639
YZ		 1631 rt->dst.flags |= DST_HOST;
1632 rt->dst.output = ip6_output;
d8d1f30b 1633 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1634 rt->rt6i_gateway = fl6->daddr;
87a11578 1635 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1636 rt->rt6i_dst.plen = 128;
1637 rt->rt6i_idev = idev;
14edd87d 1638 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1639
3b00944c 1640 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1641 rt->dst.next = icmp6_dst_gc_list;
1642 icmp6_dst_gc_list = &rt->dst;
3b00944c 1643 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1644
5578689a 1645 fib6_force_start_gc(net);
1da177e4 1646
87a11578
DM		 1647 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1648
1da177e4 1649out:
87a11578 1650 return dst;
1da177e4
LT		 1651}
1652
3d0f24a7 1653int icmp6_dst_gc(void)
1da177e4 1654{
e9476e95 1655 struct dst_entry *dst, **pprev;
3d0f24a7 1656 int more = 0;
1da177e4 1657
3b00944c
YH		 1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1660
1da177e4
LT		 1661 while ((dst = *pprev) != NULL) {
1662 if (!atomic_read(&dst->__refcnt)) {
1663 *pprev = dst->next;
1664 dst_free(dst);
1da177e4
LT		 1665 } else {
1666 pprev = &dst->next;
3d0f24a7 1667 ++more;
1da177e4
LT		 1668 }
1669 }
1670
3b00944c 1671 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1672
3d0f24a7 1673 return more;
1da177e4
LT		 1674}
1675
1e493d19
DM		 1676static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1677 void *arg)
1678{
1679 struct dst_entry *dst, **pprev;
1680
1681 spin_lock_bh(&icmp6_dst_lock);
1682 pprev = &icmp6_dst_gc_list;
1683 while ((dst = *pprev) != NULL) {
1684 struct rt6_info *rt = (struct rt6_info *) dst;
1685 if (func(rt, arg)) {
1686 *pprev = dst->next;
1687 dst_free(dst);
1688 } else {
1689 pprev = &dst->next;
1690 }
1691 }
1692 spin_unlock_bh(&icmp6_dst_lock);
1693}
1694
569d3645 1695static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1696{
86393e52 1697 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1698 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1699 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1700 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1701 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1702 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1703 int entries;
7019b78e 1704
fc66f95c 1705 entries = dst_entries_get_fast(ops);
49a18d86 1706 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1707 entries <= rt_max_size)
1da177e4
LT		 1708 goto out;
1709
6891a346 1710 net->ipv6.ip6_rt_gc_expire++;
14956643 1711 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1712 entries = dst_entries_get_slow(ops);
1713 if (entries < ops->gc_thresh)
7019b78e 1714 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1715out:
7019b78e 1716 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1717 return entries > rt_max_size;
1da177e4
LT		 1718}
1719
e715b6d3
FW		 1720static int ip6_convert_metrics(struct mx6_config *mxc,
1721 const struct fib6_config *cfg)
1722{
c3a8d947 1723 bool ecn_ca = false;
e715b6d3
FW		 1724 struct nlattr *nla;
1725 int remaining;
1726 u32 *mp;
1727
63159f29 1728 if (!cfg->fc_mx)
e715b6d3
FW		 1729 return 0;
1730
1731 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1732 if (unlikely(!mp))
1733 return -ENOMEM;
1734
1735 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1736 int type = nla_type(nla);
1bb14807 1737 u32 val;
e715b6d3 1738
1bb14807
DB		 1739 if (!type)
1740 continue;
1741 if (unlikely(type > RTAX_MAX))
1742 goto err;
ea697639 1743
1bb14807
DB		 1744 if (type == RTAX_CC_ALGO) {
1745 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1746
1bb14807 1747 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1748 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1749 if (val == TCP_CA_UNSPEC)
1750 goto err;
1751 } else {
1752 val = nla_get_u32(nla);
e715b6d3 1753 }
626abd59
PA		 1754 if (type == RTAX_HOPLIMIT && val > 255)
1755 val = 255;
b8d3e416
DB		 1756 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1757 goto err;
1bb14807
DB		 1758
1759 mp[type - 1] = val;
1760 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1761 }
1762
c3a8d947
DB		 1763 if (ecn_ca) {
1764 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1765 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1766 }
e715b6d3 1767
c3a8d947 1768 mxc->mx = mp;
e715b6d3
FW		 1769 return 0;
1770 err:
1771 kfree(mp);
1772 return -EINVAL;
1773}
1da177e4 1774
8c14586f
DA		 1775static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1776 struct fib6_config *cfg,
1777 const struct in6_addr *gw_addr)
1778{
1779 struct flowi6 fl6 = {
1780 .flowi6_oif = cfg->fc_ifindex,
1781 .daddr = *gw_addr,
1782 .saddr = cfg->fc_prefsrc,
1783 };
1784 struct fib6_table *table;
1785 struct rt6_info *rt;
48f1dcb5 1786 int flags = RT6_LOOKUP_F_IFACE;
8c14586f
DA		 1787
1788 table = fib6_get_table(net, cfg->fc_table);
1789 if (!table)
1790 return NULL;
1791
1792 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1793 flags |= RT6_LOOKUP_F_HAS_SADDR;
1794
1795 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1796
1797 /* if table lookup failed, fall back to full lookup */
1798 if (rt == net->ipv6.ip6_null_entry) {
1799 ip6_rt_put(rt);
1800 rt = NULL;
1801 }
1802
1803 return rt;
1804}
1805
8c5b83f0 1806static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1807{
5578689a 1808 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1809 struct rt6_info *rt = NULL;
1810 struct net_device *dev = NULL;
1811 struct inet6_dev *idev = NULL;
c71099ac 1812 struct fib6_table *table;
1da177e4 1813 int addr_type;
8c5b83f0 1814 int err = -EINVAL;
1da177e4 1815
86872cb5 1816 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1817 goto out;
1da177e4 1818#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1819 if (cfg->fc_src_len)
8c5b83f0 1820 goto out;
1da177e4 1821#endif
86872cb5 1822 if (cfg->fc_ifindex) {
1da177e4 1823 err = -ENODEV;
5578689a 1824 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1825 if (!dev)
1826 goto out;
1827 idev = in6_dev_get(dev);
1828 if (!idev)
1829 goto out;
1830 }
1831
86872cb5
TG		 1832 if (cfg->fc_metric == 0)
1833 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1834
d71314b4 1835 err = -ENOBUFS;
38308473
DM		 1836 if (cfg->fc_nlinfo.nlh &&
1837 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1838 table = fib6_get_table(net, cfg->fc_table);
38308473 1839 if (!table) {
f3213831 1840 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1841 table = fib6_new_table(net, cfg->fc_table);
1842 }
1843 } else {
1844 table = fib6_new_table(net, cfg->fc_table);
1845 }
38308473
DM		 1846
1847 if (!table)
c71099ac 1848 goto out;
c71099ac 1849
ad706862
MKL		 1850 rt = ip6_dst_alloc(net, NULL,
1851 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1852
38308473 1853 if (!rt) {
1da177e4
LT		 1854 err = -ENOMEM;
1855 goto out;
1856 }
1857
1716a961
G		 1858 if (cfg->fc_flags & RTF_EXPIRES)
1859 rt6_set_expires(rt, jiffies +
1860 clock_t_to_jiffies(cfg->fc_expires));
1861 else
1862 rt6_clean_expires(rt);
1da177e4 1863
86872cb5
TG		 1864 if (cfg->fc_protocol == RTPROT_UNSPEC)
1865 cfg->fc_protocol = RTPROT_BOOT;
1866 rt->rt6i_protocol = cfg->fc_protocol;
1867
1868 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1869
1870 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1871 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1872 else if (cfg->fc_flags & RTF_LOCAL)
1873 rt->dst.input = ip6_input;
1da177e4 1874 else
d8d1f30b 1875 rt->dst.input = ip6_forward;
1da177e4 1876
d8d1f30b 1877 rt->dst.output = ip6_output;
1da177e4 1878
19e42e45
RP		 1879 if (cfg->fc_encap) {
1880 struct lwtunnel_state *lwtstate;
1881
1882 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1883 cfg->fc_encap, AF_INET6, cfg,
1884 &lwtstate);
19e42e45
RP		 1885 if (err)
1886 goto out;
61adedf3
JB		 1887 rt->dst.lwtstate = lwtstate_get(lwtstate);
1888 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1889 rt->dst.lwtstate->orig_output = rt->dst.output;
1890 rt->dst.output = lwtunnel_output;
25368623 1891 }
61adedf3
JB		 1892 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1893 rt->dst.lwtstate->orig_input = rt->dst.input;
1894 rt->dst.input = lwtunnel_input;
25368623 1895 }
19e42e45
RP		 1896 }
1897
86872cb5
TG		 1898 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1899 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1900 if (rt->rt6i_dst.plen == 128)
e5fd387a 1901 rt->dst.flags |= DST_HOST;
e5fd387a 1902
1da177e4 1903#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1904 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1905 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1906#endif
1907
86872cb5 1908 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1909
1910 /* We cannot add true routes via loopback here,
1911 they would result in kernel looping; promote them to reject routes
1912 */
86872cb5 1913 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1914 (dev && (dev->flags & IFF_LOOPBACK) &&
1915 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1916 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1917 /* hold loopback dev/idev if we haven't done so. */
5578689a 1918 if (dev != net->loopback_dev) {
1da177e4
LT		 1919 if (dev) {
1920 dev_put(dev);
1921 in6_dev_put(idev);
1922 }
5578689a 1923 dev = net->loopback_dev;
1da177e4
LT		 1924 dev_hold(dev);
1925 idev = in6_dev_get(dev);
1926 if (!idev) {
1927 err = -ENODEV;
1928 goto out;
1929 }
1930 }
1da177e4 1931 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1932 switch (cfg->fc_type) {
1933 case RTN_BLACKHOLE:
1934 rt->dst.error = -EINVAL;
ede2059d 1935 rt->dst.output = dst_discard_out;
7150aede 1936 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1937 break;
1938 case RTN_PROHIBIT:
1939 rt->dst.error = -EACCES;
7150aede
K		 1940 rt->dst.output = ip6_pkt_prohibit_out;
1941 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1942 break;
b4949ab2 1943 case RTN_THROW:
0315e382 1944 case RTN_UNREACHABLE:
ef2c7d7b 1945 default:
7150aede 1946 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1947 : (cfg->fc_type == RTN_UNREACHABLE)
1948 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1949 rt->dst.output = ip6_pkt_discard_out;
1950 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1951 break;
1952 }
1da177e4
LT		 1953 goto install_route;
1954 }
1955
86872cb5 1956 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1957 const struct in6_addr *gw_addr;
1da177e4
LT		 1958 int gwa_type;
1959
86872cb5 1960 gw_addr = &cfg->fc_gateway;
330567b7 1961 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1962
1963 /* if gw_addr is local we will fail to detect this in case
1964 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1965 * will return already-added prefix route via interface that
1966 * prefix route was assigned to, which might be non-loopback.
1967 */
1968 err = -EINVAL;
330567b7
FW		 1969 if (ipv6_chk_addr_and_flags(net, gw_addr,
1970 gwa_type & IPV6_ADDR_LINKLOCAL ?
1971 dev : NULL, 0, 0))
48ed7b26
FW		 1972 goto out;
1973
4e3fd7a0 1974 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1975
1976 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
8c14586f 1977 struct rt6_info *grt = NULL;
1da177e4
LT		 1978
1979 /* IPv6 strictly inhibits using not link-local
1980 addresses as nexthop address.
1981 Otherwise, router will not able to send redirects.
1982 It is very good, but in some (rare!) circumstances
1983 (SIT, PtP, NBMA NOARP links) it is handy to allow
1984 some exceptions. --ANK
1985 */
38308473 1986 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1987 goto out;
1988
8c14586f
DA		 1989 if (cfg->fc_table)
1990 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1991
1992 if (!grt)
1993 grt = rt6_lookup(net, gw_addr, NULL,
1994 cfg->fc_ifindex, 1);
1da177e4
LT		 1995
1996 err = -EHOSTUNREACH;
38308473 1997 if (!grt)
1da177e4
LT		 1998 goto out;
1999 if (dev) {
d1918542 2000 if (dev != grt->dst.dev) {
94e187c0 2001 ip6_rt_put(grt);
1da177e4
LT		 2002 goto out;
2003 }
2004 } else {
d1918542 2005 dev = grt->dst.dev;
1da177e4
LT		 2006 idev = grt->rt6i_idev;
2007 dev_hold(dev);
2008 in6_dev_hold(grt->rt6i_idev);
2009 }
38308473 2010 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 2011 err = 0;
94e187c0 2012 ip6_rt_put(grt);
1da177e4
LT		 2013
2014 if (err)
2015 goto out;
2016 }
2017 err = -EINVAL;
38308473 2018 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2019 goto out;
2020 }
2021
2022 err = -ENODEV;
38308473 2023 if (!dev)
1da177e4
LT		 2024 goto out;
2025
c3968a85
DW		 2026 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2027 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2028 err = -EINVAL;
2029 goto out;
2030 }
4e3fd7a0 2031 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 2032 rt->rt6i_prefsrc.plen = 128;
2033 } else
2034 rt->rt6i_prefsrc.plen = 0;
2035
86872cb5 2036 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2037
2038install_route:
d8d1f30b 2039 rt->dst.dev = dev;
1da177e4 2040 rt->rt6i_idev = idev;
c71099ac 2041 rt->rt6i_table = table;
63152fc0 2042
c346dca1 2043 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2044
8c5b83f0 2045 return rt;
6b9ea5a6
RP		 2046out:
2047 if (dev)
2048 dev_put(dev);
2049 if (idev)
2050 in6_dev_put(idev);
2051 if (rt)
2052 dst_free(&rt->dst);
2053
8c5b83f0 2054 return ERR_PTR(err);
6b9ea5a6
RP		 2055}
2056
2057int ip6_route_add(struct fib6_config *cfg)
2058{
2059 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2060 struct rt6_info *rt;
6b9ea5a6
RP		 2061 int err;
2062
8c5b83f0
RP		 2063 rt = ip6_route_info_create(cfg);
2064 if (IS_ERR(rt)) {
2065 err = PTR_ERR(rt);
2066 rt = NULL;
6b9ea5a6 2067 goto out;
8c5b83f0 2068 }
6b9ea5a6 2069
e715b6d3
FW		 2070 err = ip6_convert_metrics(&mxc, cfg);
2071 if (err)
2072 goto out;
1da177e4 2073
e715b6d3
FW		 2074 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2075
2076 kfree(mxc.mx);
6b9ea5a6 2077
e715b6d3 2078 return err;
1da177e4 2079out:
1da177e4 2080 if (rt)
d8d1f30b 2081 dst_free(&rt->dst);
6b9ea5a6 2082
1da177e4
LT		 2083 return err;
2084}
2085
86872cb5 2086static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2087{
2088 int err;
c71099ac 2089 struct fib6_table *table;
d1918542 2090 struct net *net = dev_net(rt->dst.dev);
1da177e4 2091
8e3d5be7
MKL		 2092 if (rt == net->ipv6.ip6_null_entry ||
2093 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2094 err = -ENOENT;
2095 goto out;
2096 }
6c813a72 2097
c71099ac
TG		 2098 table = rt->rt6i_table;
2099 write_lock_bh(&table->tb6_lock);
86872cb5 2100 err = fib6_del(rt, info);
c71099ac 2101 write_unlock_bh(&table->tb6_lock);
1da177e4 2102
6825a26c 2103out:
94e187c0 2104 ip6_rt_put(rt);
1da177e4
LT		 2105 return err;
2106}
2107
e0a1ad73
TG		 2108int ip6_del_rt(struct rt6_info *rt)
2109{
4d1169c1 2110 struct nl_info info = {
d1918542 2111 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2112 };
528c4ceb 2113 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2114}
2115
86872cb5 2116static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2117{
c71099ac 2118 struct fib6_table *table;
1da177e4
LT		 2119 struct fib6_node *fn;
2120 struct rt6_info *rt;
2121 int err = -ESRCH;
2122
5578689a 2123 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2124 if (!table)
c71099ac
TG		 2125 return err;
2126
2127 read_lock_bh(&table->tb6_lock);
1da177e4 2128
c71099ac 2129 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2130 &cfg->fc_dst, cfg->fc_dst_len,
2131 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2132
1da177e4 2133 if (fn) {
d8d1f30b 2134 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2135 if ((rt->rt6i_flags & RTF_CACHE) &&
2136 !(cfg->fc_flags & RTF_CACHE))
2137 continue;
86872cb5 2138 if (cfg->fc_ifindex &&
d1918542
DM		 2139 (!rt->dst.dev ||
2140 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2141 continue;
86872cb5
TG		 2142 if (cfg->fc_flags & RTF_GATEWAY &&
2143 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2144 continue;
86872cb5 2145 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2146 continue;
d8d1f30b 2147 dst_hold(&rt->dst);
c71099ac 2148 read_unlock_bh(&table->tb6_lock);
1da177e4 2149
86872cb5 2150 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2151 }
2152 }
c71099ac 2153 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2154
2155 return err;
2156}
2157
6700c270 2158static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2159{
a6279458 2160 struct netevent_redirect netevent;
e8599ff4 2161 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2162 struct ndisc_options ndopts;
2163 struct inet6_dev *in6_dev;
2164 struct neighbour *neigh;
71bcdba0 2165 struct rd_msg *msg;
6e157b6a
DM		 2166 int optlen, on_link;
2167 u8 *lladdr;
e8599ff4 2168
29a3cad5 2169 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2170 optlen -= sizeof(*msg);
e8599ff4
DM		 2171
2172 if (optlen < 0) {
6e157b6a 2173 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2174 return;
2175 }
2176
71bcdba0 2177 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2178
71bcdba0 2179 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2180 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2181 return;
2182 }
2183
6e157b6a 2184 on_link = 0;
71bcdba0 2185 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2186 on_link = 1;
71bcdba0 2187 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2188 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2189 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2190 return;
2191 }
2192
2193 in6_dev = __in6_dev_get(skb->dev);
2194 if (!in6_dev)
2195 return;
2196 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2197 return;
2198
2199 /* RFC2461 8.1:
2200 * The IP source address of the Redirect MUST be the same as the current
2201 * first-hop router for the specified ICMP Destination Address.
2202 */
2203
f997c55c 2204 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2205 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2206 return;
2207 }
6e157b6a
DM		 2208
2209 lladdr = NULL;
e8599ff4
DM		 2210 if (ndopts.nd_opts_tgt_lladdr) {
2211 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2212 skb->dev);
2213 if (!lladdr) {
2214 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2215 return;
2216 }
2217 }
2218
6e157b6a 2219 rt = (struct rt6_info *) dst;
ec13ad1d 2220 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2221 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2222 return;
6e157b6a 2223 }
e8599ff4 2224
6e157b6a
DM		 2225 /* Redirect received -> path was valid.
2226 * Look, redirects are sent only in response to data packets,
2227 * so that this nexthop apparently is reachable. --ANK
2228 */
2229 dst_confirm(&rt->dst);
a6279458 2230
71bcdba0 2231 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2232 if (!neigh)
2233 return;
a6279458 2234
1da177e4
LT		 2235 /*
2236 * We have finally decided to accept it.
2237 */
2238
f997c55c 2239 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 2240 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2241 NEIGH_UPDATE_F_OVERRIDE|
2242 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 2243 NEIGH_UPDATE_F_ISROUTER)),
2244 NDISC_REDIRECT, &ndopts);
1da177e4 2245
83a09abd 2246 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2247 if (!nrt)
1da177e4
LT		 2248 goto out;
2249
2250 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2251 if (on_link)
2252 nrt->rt6i_flags &= ~RTF_GATEWAY;
2253
4e3fd7a0 2254 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2255
40e22e8f 2256 if (ip6_ins_rt(nrt))
1da177e4
LT		 2257 goto out;
2258
d8d1f30b
CG		 2259 netevent.old = &rt->dst;
2260 netevent.new = &nrt->dst;
71bcdba0 2261 netevent.daddr = &msg->dest;
60592833 2262 netevent.neigh = neigh;
8d71740c
TT		 2263 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2264
38308473 2265 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2266 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2267 ip6_del_rt(rt);
1da177e4
LT		 2268 }
2269
2270out:
e8599ff4 2271 neigh_release(neigh);
6e157b6a
DM		 2272}
2273
1da177e4
LT		 2274/*
2275 * Misc support functions
2276 */
2277
4b32b5ad
MKL		 2278static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2279{
2280 BUG_ON(from->dst.from);
2281
2282 rt->rt6i_flags &= ~RTF_EXPIRES;
2283 dst_hold(&from->dst);
2284 rt->dst.from = &from->dst;
2285 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2286}
2287
83a09abd
MKL		 2288static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2289{
2290 rt->dst.input = ort->dst.input;
2291 rt->dst.output = ort->dst.output;
2292 rt->rt6i_dst = ort->rt6i_dst;
2293 rt->dst.error = ort->dst.error;
2294 rt->rt6i_idev = ort->rt6i_idev;
2295 if (rt->rt6i_idev)
2296 in6_dev_hold(rt->rt6i_idev);
2297 rt->dst.lastuse = jiffies;
2298 rt->rt6i_gateway = ort->rt6i_gateway;
2299 rt->rt6i_flags = ort->rt6i_flags;
2300 rt6_set_from(rt, ort);
2301 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2302#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2303 rt->rt6i_src = ort->rt6i_src;
1da177e4 2304#endif
83a09abd
MKL		 2305 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2306 rt->rt6i_table = ort->rt6i_table;
61adedf3 2307 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2308}
2309
70ceb4f5 2310#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2311static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2312 const struct in6_addr *prefix, int prefixlen,
2313 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2314{
2315 struct fib6_node *fn;
2316 struct rt6_info *rt = NULL;
c71099ac
TG		 2317 struct fib6_table *table;
2318
efa2cea0 2319 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2320 if (!table)
c71099ac 2321 return NULL;
70ceb4f5 2322
5744dd9b 2323 read_lock_bh(&table->tb6_lock);
67ba4152 2324 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2325 if (!fn)
2326 goto out;
2327
d8d1f30b 2328 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2329 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2330 continue;
2331 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2332 continue;
2333 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2334 continue;
d8d1f30b 2335 dst_hold(&rt->dst);
70ceb4f5
YH		 2336 break;
2337 }
2338out:
5744dd9b 2339 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2340 return rt;
2341}
2342
efa2cea0 2343static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2344 const struct in6_addr *prefix, int prefixlen,
2345 const struct in6_addr *gwaddr, int ifindex,
95c96174 2346 unsigned int pref)
70ceb4f5 2347{
86872cb5 2348 struct fib6_config cfg = {
238fc7ea 2349 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2350 .fc_ifindex = ifindex,
2351 .fc_dst_len = prefixlen,
2352 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2353 RTF_UP | RTF_PREF(pref),
15e47304 2354 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2355 .fc_nlinfo.nlh = NULL,
2356 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2357 };
2358
ca254490 2359 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2360 cfg.fc_dst = *prefix;
2361 cfg.fc_gateway = *gwaddr;
70ceb4f5 2362
e317da96
YH		 2363 /* We should treat it as a default route if prefix length is 0. */
2364 if (!prefixlen)
86872cb5 2365 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2366
86872cb5 2367 ip6_route_add(&cfg);
70ceb4f5 2368
efa2cea0 2369 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2370}
2371#endif
2372
b71d1d42 2373struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2374{
1da177e4 2375 struct rt6_info *rt;
c71099ac 2376 struct fib6_table *table;
1da177e4 2377
c346dca1 2378 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2379 if (!table)
c71099ac 2380 return NULL;
1da177e4 2381
5744dd9b 2382 read_lock_bh(&table->tb6_lock);
67ba4152 2383 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2384 if (dev == rt->dst.dev &&
045927ff 2385 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2386 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2387 break;
2388 }
2389 if (rt)
d8d1f30b 2390 dst_hold(&rt->dst);
5744dd9b 2391 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2392 return rt;
2393}
2394
b71d1d42 2395struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2396 struct net_device *dev,
2397 unsigned int pref)
1da177e4 2398{
86872cb5 2399 struct fib6_config cfg = {
ca254490 2400 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2401 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2402 .fc_ifindex = dev->ifindex,
2403 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2404 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2405 .fc_nlinfo.portid = 0,
5578689a 2406 .fc_nlinfo.nlh = NULL,
c346dca1 2407 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2408 };
1da177e4 2409
4e3fd7a0 2410 cfg.fc_gateway = *gwaddr;
1da177e4 2411
86872cb5 2412 ip6_route_add(&cfg);
1da177e4 2413
1da177e4
LT		 2414 return rt6_get_dflt_router(gwaddr, dev);
2415}
2416
7b4da532 2417void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2418{
2419 struct rt6_info *rt;
c71099ac
TG		 2420 struct fib6_table *table;
2421
2422 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2423 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2424 if (!table)
c71099ac 2425 return;
1da177e4
LT		 2426
2427restart:
c71099ac 2428 read_lock_bh(&table->tb6_lock);
d8d1f30b 2429 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2430 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2431 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2432 dst_hold(&rt->dst);
c71099ac 2433 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2434 ip6_del_rt(rt);
1da177e4
LT		 2435 goto restart;
2436 }
2437 }
c71099ac 2438 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2439}
2440
5578689a
DL		 2441static void rtmsg_to_fib6_config(struct net *net,
2442 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2443 struct fib6_config *cfg)
2444{
2445 memset(cfg, 0, sizeof(*cfg));
2446
ca254490
DA		 2447 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2448 : RT6_TABLE_MAIN;
86872cb5
TG		 2449 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2450 cfg->fc_metric = rtmsg->rtmsg_metric;
2451 cfg->fc_expires = rtmsg->rtmsg_info;
2452 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2453 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2454 cfg->fc_flags = rtmsg->rtmsg_flags;
2455
5578689a 2456 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2457
4e3fd7a0
AD		 2458 cfg->fc_dst = rtmsg->rtmsg_dst;
2459 cfg->fc_src = rtmsg->rtmsg_src;
2460 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2461}
2462
5578689a 2463int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2464{
86872cb5 2465 struct fib6_config cfg;
1da177e4
LT		 2466 struct in6_rtmsg rtmsg;
2467 int err;
2468
67ba4152 2469 switch (cmd) {
1da177e4
LT		 2470 case SIOCADDRT: /* Add a route */
2471 case SIOCDELRT: /* Delete a route */
af31f412 2472 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2473 return -EPERM;
2474 err = copy_from_user(&rtmsg, arg,
2475 sizeof(struct in6_rtmsg));
2476 if (err)
2477 return -EFAULT;
86872cb5 2478
5578689a 2479 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2480
1da177e4
LT		 2481 rtnl_lock();
2482 switch (cmd) {
2483 case SIOCADDRT:
86872cb5 2484 err = ip6_route_add(&cfg);
1da177e4
LT		 2485 break;
2486 case SIOCDELRT:
86872cb5 2487 err = ip6_route_del(&cfg);
1da177e4
LT		 2488 break;
2489 default:
2490 err = -EINVAL;
2491 }
2492 rtnl_unlock();
2493
2494 return err;
3ff50b79 2495 }
1da177e4
LT		 2496
2497 return -EINVAL;
2498}
2499
2500/*
2501 * Drop the packet on the floor
2502 */
2503
d5fdd6ba 2504static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2505{
612f09e8 2506 int type;
adf30907 2507 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2508 switch (ipstats_mib_noroutes) {
2509 case IPSTATS_MIB_INNOROUTES:
0660e03f 2510 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2511 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2512 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2513 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2514 break;
2515 }
2516 /* FALLTHROUGH */
2517 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2518 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2519 ipstats_mib_noroutes);
612f09e8
YH		 2520 break;
2521 }
3ffe533c 2522 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2523 kfree_skb(skb);
2524 return 0;
2525}
2526
9ce8ade0
TG		 2527static int ip6_pkt_discard(struct sk_buff *skb)
2528{
612f09e8 2529 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2530}
2531
ede2059d 2532static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2533{
adf30907 2534 skb->dev = skb_dst(skb)->dev;
612f09e8 2535 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2536}
2537
9ce8ade0
TG		 2538static int ip6_pkt_prohibit(struct sk_buff *skb)
2539{
612f09e8 2540 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2541}
2542
ede2059d 2543static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2544{
adf30907 2545 skb->dev = skb_dst(skb)->dev;
612f09e8 2546 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2547}
2548
1da177e4
LT		 2549/*
2550 * Allocate a dst for local (unicast / anycast) address.
2551 */
2552
2553struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2554 const struct in6_addr *addr,
8f031519 2555 bool anycast)
1da177e4 2556{
ca254490 2557 u32 tb_id;
c346dca1 2558 struct net *net = dev_net(idev->dev);
a3300ef4 2559 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2560 DST_NOCOUNT);
a3300ef4 2561 if (!rt)
1da177e4
LT		 2562 return ERR_PTR(-ENOMEM);
2563
1da177e4
LT		 2564 in6_dev_hold(idev);
2565
11d53b49 2566 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2567 rt->dst.input = ip6_input;
2568 rt->dst.output = ip6_output;
1da177e4 2569 rt->rt6i_idev = idev;
1da177e4
LT		 2570
2571 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2572 if (anycast)
2573 rt->rt6i_flags |= RTF_ANYCAST;
2574 else
1da177e4 2575 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2576
550bab42 2577 rt->rt6i_gateway = *addr;
4e3fd7a0 2578 rt->rt6i_dst.addr = *addr;
1da177e4 2579 rt->rt6i_dst.plen = 128;
ca254490
DA		 2580 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2581 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2582 rt->dst.flags |= DST_NOCACHE;
1da177e4 2583
d8d1f30b 2584 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2585
2586 return rt;
2587}
2588
c3968a85
DW		 2589/* remove deleted ip from prefsrc entries */
2590struct arg_dev_net_ip {
2591 struct net_device *dev;
2592 struct net *net;
2593 struct in6_addr *addr;
2594};
2595
2596static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2597{
2598 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2599 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2600 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2601
d1918542 2602 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2603 rt != net->ipv6.ip6_null_entry &&
2604 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2605 /* remove prefsrc entry */
2606 rt->rt6i_prefsrc.plen = 0;
2607 }
2608 return 0;
2609}
2610
2611void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2612{
2613 struct net *net = dev_net(ifp->idev->dev);
2614 struct arg_dev_net_ip adni = {
2615 .dev = ifp->idev->dev,
2616 .net = net,
2617 .addr = &ifp->addr,
2618 };
0c3584d5 2619 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2620}
2621
be7a010d
DJ		 2622#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2623#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2624
2625/* Remove routers and update dst entries when gateway turn into host. */
2626static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2627{
2628 struct in6_addr *gateway = (struct in6_addr *)arg;
2629
2630 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2631 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2632 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2633 return -1;
2634 }
2635 return 0;
2636}
2637
2638void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2639{
2640 fib6_clean_all(net, fib6_clean_tohost, gateway);
2641}
2642
8ed67789
DL		 2643struct arg_dev_net {
2644 struct net_device *dev;
2645 struct net *net;
2646};
2647
1da177e4
LT		 2648static int fib6_ifdown(struct rt6_info *rt, void *arg)
2649{
bc3ef660 2650 const struct arg_dev_net *adn = arg;
2651 const struct net_device *dev = adn->dev;
8ed67789 2652
d1918542 2653 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2654 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2655 return -1;
c159d30c 2656
1da177e4
LT		 2657 return 0;
2658}
2659
f3db4851 2660void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2661{
8ed67789
DL		 2662 struct arg_dev_net adn = {
2663 .dev = dev,
2664 .net = net,
2665 };
2666
0c3584d5 2667 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2668 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2669 if (dev)
2670 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2671}
2672
95c96174 2673struct rt6_mtu_change_arg {
1da177e4 2674 struct net_device *dev;
95c96174 2675 unsigned int mtu;
1da177e4
LT		 2676};
2677
2678static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2679{
2680 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2681 struct inet6_dev *idev;
2682
2683 /* In IPv6 pmtu discovery is not optional,
2684 so that RTAX_MTU lock cannot disable it.
2685 We still use this lock to block changes
2686 caused by addrconf/ndisc.
2687 */
2688
2689 idev = __in6_dev_get(arg->dev);
38308473 2690 if (!idev)
1da177e4
LT		 2691 return 0;
2692
2693 /* For administrative MTU increase, there is no way to discover
2694 IPv6 PMTU increase, so PMTU increase should be updated here.
2695 Since RFC 1981 doesn't include administrative MTU increase
2696 update PMTU increase is a MUST. (i.e. jumbo frame)
2697 */
2698 /*
2699 If new MTU is less than route PMTU, this new MTU will be the
2700 lowest MTU in the path, update the route PMTU to reflect PMTU
2701 decreases; if new MTU is greater than route PMTU, and the
2702 old MTU is the lowest MTU in the path, update the route PMTU
2703 to reflect the increase. In this case if the other nodes' MTU
2704 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2705 PMTU discouvery.
2706 */
d1918542 2707 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2708 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2709 if (rt->rt6i_flags & RTF_CACHE) {
2710 /* For RTF_CACHE with rt6i_pmtu == 0
2711 * (i.e. a redirected route),
2712 * the metrics of its rt->dst.from has already
2713 * been updated.
2714 */
2715 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2716 rt->rt6i_pmtu = arg->mtu;
2717 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2718 (dst_mtu(&rt->dst) < arg->mtu &&
2719 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2720 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2721 }
566cfd8f 2722 }
1da177e4
LT		 2723 return 0;
2724}
2725
95c96174 2726void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2727{
c71099ac
TG		 2728 struct rt6_mtu_change_arg arg = {
2729 .dev = dev,
2730 .mtu = mtu,
2731 };
1da177e4 2732
0c3584d5 2733 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2734}
2735
ef7c79ed 2736static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2737 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2738 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2739 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2740 [RTA_PRIORITY] = { .type = NLA_U32 },
2741 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2742 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2743 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2744 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2745 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2746 [RTA_EXPIRES] = { .type = NLA_U32 },
86872cb5
TG		 2747};
2748
2749static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2750 struct fib6_config *cfg)
1da177e4 2751{
86872cb5
TG		 2752 struct rtmsg *rtm;
2753 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2754 unsigned int pref;
86872cb5 2755 int err;
1da177e4 2756
86872cb5
TG		 2757 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2758 if (err < 0)
2759 goto errout;
1da177e4 2760
86872cb5
TG		 2761 err = -EINVAL;
2762 rtm = nlmsg_data(nlh);
2763 memset(cfg, 0, sizeof(*cfg));
2764
2765 cfg->fc_table = rtm->rtm_table;
2766 cfg->fc_dst_len = rtm->rtm_dst_len;
2767 cfg->fc_src_len = rtm->rtm_src_len;
2768 cfg->fc_flags = RTF_UP;
2769 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2770 cfg->fc_type = rtm->rtm_type;
86872cb5 2771
ef2c7d7b
ND		 2772 if (rtm->rtm_type == RTN_UNREACHABLE ||
2773 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2774 rtm->rtm_type == RTN_PROHIBIT ||
2775 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2776 cfg->fc_flags |= RTF_REJECT;
2777
ab79ad14
MŻ		 2778 if (rtm->rtm_type == RTN_LOCAL)
2779 cfg->fc_flags |= RTF_LOCAL;
2780
1f56a01f
MKL		 2781 if (rtm->rtm_flags & RTM_F_CLONED)
2782 cfg->fc_flags |= RTF_CACHE;
2783
15e47304 2784 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2785 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2786 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2787
2788 if (tb[RTA_GATEWAY]) {
67b61f6c 2789 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2790 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2791 }
86872cb5
TG		 2792
2793 if (tb[RTA_DST]) {
2794 int plen = (rtm->rtm_dst_len + 7) >> 3;
2795
2796 if (nla_len(tb[RTA_DST]) < plen)
2797 goto errout;
2798
2799 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2800 }
86872cb5
TG		 2801
2802 if (tb[RTA_SRC]) {
2803 int plen = (rtm->rtm_src_len + 7) >> 3;
2804
2805 if (nla_len(tb[RTA_SRC]) < plen)
2806 goto errout;
2807
2808 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2809 }
86872cb5 2810
c3968a85 2811 if (tb[RTA_PREFSRC])
67b61f6c 2812 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2813
86872cb5
TG		 2814 if (tb[RTA_OIF])
2815 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2816
2817 if (tb[RTA_PRIORITY])
2818 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2819
2820 if (tb[RTA_METRICS]) {
2821 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2822 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2823 }
86872cb5
TG		 2824
2825 if (tb[RTA_TABLE])
2826 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2827
51ebd318
ND		 2828 if (tb[RTA_MULTIPATH]) {
2829 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2830 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2831 }
2832
c78ba6d6
LR		 2833 if (tb[RTA_PREF]) {
2834 pref = nla_get_u8(tb[RTA_PREF]);
2835 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2836 pref != ICMPV6_ROUTER_PREF_HIGH)
2837 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2838 cfg->fc_flags |= RTF_PREF(pref);
2839 }
2840
19e42e45
RP		 2841 if (tb[RTA_ENCAP])
2842 cfg->fc_encap = tb[RTA_ENCAP];
2843
2844 if (tb[RTA_ENCAP_TYPE])
2845 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2846
32bc201e
XL		 2847 if (tb[RTA_EXPIRES]) {
2848 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2849
2850 if (addrconf_finite_timeout(timeout)) {
2851 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2852 cfg->fc_flags |= RTF_EXPIRES;
2853 }
2854 }
2855
86872cb5
TG		 2856 err = 0;
2857errout:
2858 return err;
1da177e4
LT		 2859}
2860
6b9ea5a6
RP		 2861struct rt6_nh {
2862 struct rt6_info *rt6_info;
2863 struct fib6_config r_cfg;
2864 struct mx6_config mxc;
2865 struct list_head next;
2866};
2867
2868static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2869{
2870 struct rt6_nh *nh;
2871
2872 list_for_each_entry(nh, rt6_nh_list, next) {
2873 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2874 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2875 nh->r_cfg.fc_ifindex);
2876 }
2877}
2878
2879static int ip6_route_info_append(struct list_head *rt6_nh_list,
2880 struct rt6_info *rt, struct fib6_config *r_cfg)
2881{
2882 struct rt6_nh *nh;
2883 struct rt6_info *rtnh;
2884 int err = -EEXIST;
2885
2886 list_for_each_entry(nh, rt6_nh_list, next) {
2887 /* check if rt6_info already exists */
2888 rtnh = nh->rt6_info;
2889
2890 if (rtnh->dst.dev == rt->dst.dev &&
2891 rtnh->rt6i_idev == rt->rt6i_idev &&
2892 ipv6_addr_equal(&rtnh->rt6i_gateway,
2893 &rt->rt6i_gateway))
2894 return err;
2895 }
2896
2897 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2898 if (!nh)
2899 return -ENOMEM;
2900 nh->rt6_info = rt;
2901 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2902 if (err) {
2903 kfree(nh);
2904 return err;
2905 }
2906 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2907 list_add_tail(&nh->next, rt6_nh_list);
2908
2909 return 0;
2910}
2911
2912static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2913{
2914 struct fib6_config r_cfg;
2915 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2916 struct rt6_info *rt;
2917 struct rt6_nh *err_nh;
2918 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2919 int remaining;
2920 int attrlen;
6b9ea5a6
RP		 2921 int err = 1;
2922 int nhn = 0;
2923 int replace = (cfg->fc_nlinfo.nlh &&
2924 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2925 LIST_HEAD(rt6_nh_list);
51ebd318 2926
35f1b4e9 2927 remaining = cfg->fc_mp_len;
51ebd318 2928 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2929
6b9ea5a6
RP		 2930 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2931 * rt6_info structs per nexthop
2932 */
51ebd318
ND		 2933 while (rtnh_ok(rtnh, remaining)) {
2934 memcpy(&r_cfg, cfg, sizeof(*cfg));
2935 if (rtnh->rtnh_ifindex)
2936 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2937
2938 attrlen = rtnh_attrlen(rtnh);
2939 if (attrlen > 0) {
2940 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2941
2942 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2943 if (nla) {
67b61f6c 2944 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2945 r_cfg.fc_flags |= RTF_GATEWAY;
2946 }
19e42e45
RP		 2947 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2948 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2949 if (nla)
2950 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2951 }
6b9ea5a6 2952
8c5b83f0
RP		 2953 rt = ip6_route_info_create(&r_cfg);
2954 if (IS_ERR(rt)) {
2955 err = PTR_ERR(rt);
2956 rt = NULL;
6b9ea5a6 2957 goto cleanup;
8c5b83f0 2958 }
6b9ea5a6
RP		 2959
2960 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2961 if (err) {
6b9ea5a6
RP		 2962 dst_free(&rt->dst);
2963 goto cleanup;
2964 }
2965
2966 rtnh = rtnh_next(rtnh, &remaining);
2967 }
2968
2969 err_nh = NULL;
2970 list_for_each_entry(nh, &rt6_nh_list, next) {
2971 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2972 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2973 nh->rt6_info = NULL;
2974 if (err) {
2975 if (replace && nhn)
2976 ip6_print_replace_route_err(&rt6_nh_list);
2977 err_nh = nh;
2978 goto add_errout;
51ebd318 2979 }
6b9ea5a6 2980
1a72418b 2981 /* Because each route is added like a single route we remove
27596472
MK		 2982 * these flags after the first nexthop: if there is a collision,
2983 * we have already failed to add the first nexthop:
2984 * fib6_add_rt2node() has rejected it; when replacing, old
2985 * nexthops have been replaced by first new, the rest should
2986 * be added to it.
1a72418b 2987 */
27596472
MK		 2988 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2989 NLM_F_REPLACE);
6b9ea5a6
RP		 2990 nhn++;
2991 }
2992
2993 goto cleanup;
2994
2995add_errout:
2996 /* Delete routes that were already added */
2997 list_for_each_entry(nh, &rt6_nh_list, next) {
2998 if (err_nh == nh)
2999 break;
3000 ip6_route_del(&nh->r_cfg);
3001 }
3002
3003cleanup:
3004 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3005 if (nh->rt6_info)
3006 dst_free(&nh->rt6_info->dst);
52fe51f8 3007 kfree(nh->mxc.mx);
6b9ea5a6
RP		 3008 list_del(&nh->next);
3009 kfree(nh);
3010 }
3011
3012 return err;
3013}
3014
3015static int ip6_route_multipath_del(struct fib6_config *cfg)
3016{
3017 struct fib6_config r_cfg;
3018 struct rtnexthop *rtnh;
3019 int remaining;
3020 int attrlen;
3021 int err = 1, last_err = 0;
3022
3023 remaining = cfg->fc_mp_len;
3024 rtnh = (struct rtnexthop *)cfg->fc_mp;
3025
3026 /* Parse a Multipath Entry */
3027 while (rtnh_ok(rtnh, remaining)) {
3028 memcpy(&r_cfg, cfg, sizeof(*cfg));
3029 if (rtnh->rtnh_ifindex)
3030 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3031
3032 attrlen = rtnh_attrlen(rtnh);
3033 if (attrlen > 0) {
3034 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3035
3036 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3037 if (nla) {
3038 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3039 r_cfg.fc_flags |= RTF_GATEWAY;
3040 }
3041 }
3042 err = ip6_route_del(&r_cfg);
3043 if (err)
3044 last_err = err;
3045
51ebd318
ND		 3046 rtnh = rtnh_next(rtnh, &remaining);
3047 }
3048
3049 return last_err;
3050}
3051
67ba4152 3052static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3053{
86872cb5
TG		 3054 struct fib6_config cfg;
3055 int err;
1da177e4 3056
86872cb5
TG		 3057 err = rtm_to_fib6_config(skb, nlh, &cfg);
3058 if (err < 0)
3059 return err;
3060
51ebd318 3061 if (cfg.fc_mp)
6b9ea5a6 3062 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3063 else
3064 return ip6_route_del(&cfg);
1da177e4
LT		 3065}
3066
67ba4152 3067static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3068{
86872cb5
TG		 3069 struct fib6_config cfg;
3070 int err;
1da177e4 3071
86872cb5
TG		 3072 err = rtm_to_fib6_config(skb, nlh, &cfg);
3073 if (err < 0)
3074 return err;
3075
51ebd318 3076 if (cfg.fc_mp)
6b9ea5a6 3077 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3078 else
3079 return ip6_route_add(&cfg);
1da177e4
LT		 3080}
3081
19e42e45 3082static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3083{
3084 return NLMSG_ALIGN(sizeof(struct rtmsg))
3085 + nla_total_size(16) /* RTA_SRC */
3086 + nla_total_size(16) /* RTA_DST */
3087 + nla_total_size(16) /* RTA_GATEWAY */
3088 + nla_total_size(16) /* RTA_PREFSRC */
3089 + nla_total_size(4) /* RTA_TABLE */
3090 + nla_total_size(4) /* RTA_IIF */
3091 + nla_total_size(4) /* RTA_OIF */
3092 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3093 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3094 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3095 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3096 + nla_total_size(1) /* RTA_PREF */
61adedf3 3097 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3098}
3099
191cd582
BH		 3100static int rt6_fill_node(struct net *net,
3101 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3102 struct in6_addr *dst, struct in6_addr *src,
15e47304 3103 int iif, int type, u32 portid, u32 seq,
7bc570c8 3104 int prefix, int nowait, unsigned int flags)
1da177e4 3105{
4b32b5ad 3106 u32 metrics[RTAX_MAX];
1da177e4 3107 struct rtmsg *rtm;
2d7202bf 3108 struct nlmsghdr *nlh;
e3703b3d 3109 long expires;
9e762a4a 3110 u32 table;
1da177e4
LT		 3111
3112 if (prefix) { /* user wants prefix routes only */
3113 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3114 /* success since this is not a prefix route */
3115 return 1;
3116 }
3117 }
3118
15e47304 3119 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3120 if (!nlh)
26932566 3121 return -EMSGSIZE;
2d7202bf
TG		 3122
3123 rtm = nlmsg_data(nlh);
1da177e4
LT		 3124 rtm->rtm_family = AF_INET6;
3125 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3126 rtm->rtm_src_len = rt->rt6i_src.plen;
3127 rtm->rtm_tos = 0;
c71099ac 3128 if (rt->rt6i_table)
9e762a4a 3129 table = rt->rt6i_table->tb6_id;
c71099ac 3130 else
9e762a4a
PM		 3131 table = RT6_TABLE_UNSPEC;
3132 rtm->rtm_table = table;
c78679e8
DM		 3133 if (nla_put_u32(skb, RTA_TABLE, table))
3134 goto nla_put_failure;
ef2c7d7b
ND		 3135 if (rt->rt6i_flags & RTF_REJECT) {
3136 switch (rt->dst.error) {
3137 case -EINVAL:
3138 rtm->rtm_type = RTN_BLACKHOLE;
3139 break;
3140 case -EACCES:
3141 rtm->rtm_type = RTN_PROHIBIT;
3142 break;
b4949ab2
ND		 3143 case -EAGAIN:
3144 rtm->rtm_type = RTN_THROW;
3145 break;
ef2c7d7b
ND		 3146 default:
3147 rtm->rtm_type = RTN_UNREACHABLE;
3148 break;
3149 }
3150 }
38308473 3151 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3152 rtm->rtm_type = RTN_LOCAL;
d1918542 3153 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3154 rtm->rtm_type = RTN_LOCAL;
3155 else
3156 rtm->rtm_type = RTN_UNICAST;
3157 rtm->rtm_flags = 0;
35103d11 3158 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3159 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3160 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3161 rtm->rtm_flags |= RTNH_F_DEAD;
3162 }
1da177e4
LT		 3163 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3164 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3165 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3166 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3167 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3168 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3169 rtm->rtm_protocol = RTPROT_RA;
3170 else
3171 rtm->rtm_protocol = RTPROT_KERNEL;
3172 }
1da177e4 3173
38308473 3174 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3175 rtm->rtm_flags |= RTM_F_CLONED;
3176
3177 if (dst) {
930345ea 3178 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3179 goto nla_put_failure;
1ab1457c 3180 rtm->rtm_dst_len = 128;
1da177e4 3181 } else if (rtm->rtm_dst_len)
930345ea 3182 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3183 goto nla_put_failure;
1da177e4
LT		 3184#ifdef CONFIG_IPV6_SUBTREES
3185 if (src) {
930345ea 3186 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3187 goto nla_put_failure;
1ab1457c 3188 rtm->rtm_src_len = 128;
c78679e8 3189 } else if (rtm->rtm_src_len &&
930345ea 3190 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3191 goto nla_put_failure;
1da177e4 3192#endif
7bc570c8
YH		 3193 if (iif) {
3194#ifdef CONFIG_IPV6_MROUTE
3195 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3196 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3197 if (err <= 0) {
3198 if (!nowait) {
3199 if (err == 0)
3200 return 0;
3201 goto nla_put_failure;
3202 } else {
3203 if (err == -EMSGSIZE)
3204 goto nla_put_failure;
3205 }
3206 }
3207 } else
3208#endif
c78679e8
DM		 3209 if (nla_put_u32(skb, RTA_IIF, iif))
3210 goto nla_put_failure;
7bc570c8 3211 } else if (dst) {
1da177e4 3212 struct in6_addr saddr_buf;
c78679e8 3213 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3214 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3215 goto nla_put_failure;
1da177e4 3216 }
2d7202bf 3217
c3968a85
DW		 3218 if (rt->rt6i_prefsrc.plen) {
3219 struct in6_addr saddr_buf;
4e3fd7a0 3220 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3221 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3222 goto nla_put_failure;
c3968a85
DW		 3223 }
3224
4b32b5ad
MKL		 3225 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3226 if (rt->rt6i_pmtu)
3227 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3228 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3229 goto nla_put_failure;
3230
dd0cbf29 3231 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3232 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3233 goto nla_put_failure;
94f826b8 3234 }
2d7202bf 3235
c78679e8
DM		 3236 if (rt->dst.dev &&
3237 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3238 goto nla_put_failure;
3239 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3240 goto nla_put_failure;
8253947e
LW		 3241
3242 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3243
87a50699 3244 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3245 goto nla_put_failure;
2d7202bf 3246
c78ba6d6
LR		 3247 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3248 goto nla_put_failure;
3249
61adedf3 3250 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3251
053c095a
JB		 3252 nlmsg_end(skb, nlh);
3253 return 0;
2d7202bf
TG		 3254
3255nla_put_failure:
26932566
PM		 3256 nlmsg_cancel(skb, nlh);
3257 return -EMSGSIZE;
1da177e4
LT		 3258}
3259
1b43af54 3260int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3261{
3262 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3263 int prefix;
3264
2d7202bf
TG		 3265 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3266 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3267 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3268 } else
3269 prefix = 0;
3270
191cd582
BH		 3271 return rt6_fill_node(arg->net,
3272 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3273 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3274 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3275}
3276
67ba4152 3277static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3278{
3b1e0a65 3279 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3280 struct nlattr *tb[RTA_MAX+1];
3281 struct rt6_info *rt;
1da177e4 3282 struct sk_buff *skb;
ab364a6f 3283 struct rtmsg *rtm;
4c9483b2 3284 struct flowi6 fl6;
72331bc0 3285 int err, iif = 0, oif = 0;
1da177e4 3286
ab364a6f
TG		 3287 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3288 if (err < 0)
3289 goto errout;
1da177e4 3290
ab364a6f 3291 err = -EINVAL;
4c9483b2 3292 memset(&fl6, 0, sizeof(fl6));
38b7097b
HFS		 3293 rtm = nlmsg_data(nlh);
3294 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
1da177e4 3295
ab364a6f
TG		 3296 if (tb[RTA_SRC]) {
3297 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3298 goto errout;
3299
4e3fd7a0 3300 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3301 }
3302
3303 if (tb[RTA_DST]) {
3304 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3305 goto errout;
3306
4e3fd7a0 3307 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3308 }
3309
3310 if (tb[RTA_IIF])
3311 iif = nla_get_u32(tb[RTA_IIF]);
3312
3313 if (tb[RTA_OIF])
72331bc0 3314 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3315
2e47b291
LC		 3316 if (tb[RTA_MARK])
3317 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3318
1da177e4
LT		 3319 if (iif) {
3320 struct net_device *dev;
72331bc0
SL		 3321 int flags = 0;
3322
5578689a 3323 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3324 if (!dev) {
3325 err = -ENODEV;
ab364a6f 3326 goto errout;
1da177e4 3327 }
72331bc0
SL		 3328
3329 fl6.flowi6_iif = iif;
3330
3331 if (!ipv6_addr_any(&fl6.saddr))
3332 flags |= RT6_LOOKUP_F_HAS_SADDR;
3333
3334 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3335 flags);
3336 } else {
3337 fl6.flowi6_oif = oif;
3338
ca254490
DA		 3339 if (netif_index_is_l3_master(net, oif)) {
3340 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3341 FLOWI_FLAG_SKIP_NH_OIF;
3342 }
3343
72331bc0 3344 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3345 }
3346
ab364a6f 3347 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3348 if (!skb) {
94e187c0 3349 ip6_rt_put(rt);
ab364a6f
TG		 3350 err = -ENOBUFS;
3351 goto errout;
3352 }
1da177e4 3353
ab364a6f
TG		 3354 /* Reserve room for dummy headers, this skb can pass
3355 through good chunk of routing engine.
3356 */
459a98ed 3357 skb_reset_mac_header(skb);
ab364a6f 3358 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3359
d8d1f30b 3360 skb_dst_set(skb, &rt->dst);
1da177e4 3361
4c9483b2 3362 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3363 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3364 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3365 if (err < 0) {
ab364a6f
TG		 3366 kfree_skb(skb);
3367 goto errout;
1da177e4
LT		 3368 }
3369
15e47304 3370 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3371errout:
1da177e4 3372 return err;
1da177e4
LT		 3373}
3374
37a1d361
RP		 3375void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3376 unsigned int nlm_flags)
1da177e4
LT		 3377{
3378 struct sk_buff *skb;
5578689a 3379 struct net *net = info->nl_net;
528c4ceb
DL		 3380 u32 seq;
3381 int err;
3382
3383 err = -ENOBUFS;
38308473 3384 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3385
19e42e45 3386 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3387 if (!skb)
21713ebc
TG		 3388 goto errout;
3389
191cd582 3390 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3391 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3392 if (err < 0) {
3393 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3394 WARN_ON(err == -EMSGSIZE);
3395 kfree_skb(skb);
3396 goto errout;
3397 }
15e47304 3398 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3399 info->nlh, gfp_any());
3400 return;
21713ebc
TG		 3401errout:
3402 if (err < 0)
5578689a 3403 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3404}
3405
8ed67789 3406static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3407 unsigned long event, void *ptr)
8ed67789 3408{
351638e7 3409 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3410 struct net *net = dev_net(dev);
8ed67789
DL		 3411
3412 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3413 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3414 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3415#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3416 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3417 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3418 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3419 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3420#endif
3421 }
3422
3423 return NOTIFY_OK;
3424}
3425
1da177e4
LT		 3426/*
3427 * /proc
3428 */
3429
3430#ifdef CONFIG_PROC_FS
3431
33120b30
AD		 3432static const struct file_operations ipv6_route_proc_fops = {
3433 .owner = THIS_MODULE,
3434 .open = ipv6_route_open,
3435 .read = seq_read,
3436 .llseek = seq_lseek,
8d2ca1d7 3437 .release = seq_release_net,
33120b30
AD		 3438};
3439
1da177e4
LT		 3440static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3441{
69ddb805 3442 struct net *net = (struct net *)seq->private;
1da177e4 3443 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3444 net->ipv6.rt6_stats->fib_nodes,
3445 net->ipv6.rt6_stats->fib_route_nodes,
3446 net->ipv6.rt6_stats->fib_rt_alloc,
3447 net->ipv6.rt6_stats->fib_rt_entries,
3448 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3449 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3450 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3451
3452 return 0;
3453}
3454
3455static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3456{
de05c557 3457 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3458}
3459
9a32144e 3460static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3461 .owner = THIS_MODULE,
3462 .open = rt6_stats_seq_open,
3463 .read = seq_read,
3464 .llseek = seq_lseek,
b6fcbdb4 3465 .release = single_release_net,
1da177e4
LT		 3466};
3467#endif /* CONFIG_PROC_FS */
3468
3469#ifdef CONFIG_SYSCTL
3470
1da177e4 3471static
fe2c6338 3472int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3473 void __user *buffer, size_t *lenp, loff_t *ppos)
3474{
c486da34
LAG		 3475 struct net *net;
3476 int delay;
3477 if (!write)
1da177e4 3478 return -EINVAL;
c486da34
LAG		 3479
3480 net = (struct net *)ctl->extra1;
3481 delay = net->ipv6.sysctl.flush_delay;
3482 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3483 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3484 return 0;
1da177e4
LT		 3485}
3486
fe2c6338 3487struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3488 {
1da177e4 3489 .procname = "flush",
4990509f 3490 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3491 .maxlen = sizeof(int),
89c8b3a1 3492 .mode = 0200,
6d9f239a 3493 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3494 },
3495 {
1da177e4 3496 .procname = "gc_thresh",
9a7ec3a9 3497 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3498 .maxlen = sizeof(int),
3499 .mode = 0644,
6d9f239a 3500 .proc_handler = proc_dointvec,
1da177e4
LT		 3501 },
3502 {
1da177e4 3503 .procname = "max_size",
4990509f 3504 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3505 .maxlen = sizeof(int),
3506 .mode = 0644,
6d9f239a 3507 .proc_handler = proc_dointvec,
1da177e4
LT		 3508 },
3509 {
1da177e4 3510 .procname = "gc_min_interval",
4990509f 3511 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3512 .maxlen = sizeof(int),
3513 .mode = 0644,
6d9f239a 3514 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3515 },
3516 {
1da177e4 3517 .procname = "gc_timeout",
4990509f 3518 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3519 .maxlen = sizeof(int),
3520 .mode = 0644,
6d9f239a 3521 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3522 },
3523 {
1da177e4 3524 .procname = "gc_interval",
4990509f 3525 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3526 .maxlen = sizeof(int),
3527 .mode = 0644,
6d9f239a 3528 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3529 },
3530 {
1da177e4 3531 .procname = "gc_elasticity",
4990509f 3532 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3533 .maxlen = sizeof(int),
3534 .mode = 0644,
f3d3f616 3535 .proc_handler = proc_dointvec,
1da177e4
LT		 3536 },
3537 {
1da177e4 3538 .procname = "mtu_expires",
4990509f 3539 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3540 .maxlen = sizeof(int),
3541 .mode = 0644,
6d9f239a 3542 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3543 },
3544 {
1da177e4 3545 .procname = "min_adv_mss",
4990509f 3546 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3547 .maxlen = sizeof(int),
3548 .mode = 0644,
f3d3f616 3549 .proc_handler = proc_dointvec,
1da177e4
LT		 3550 },
3551 {
1da177e4 3552 .procname = "gc_min_interval_ms",
4990509f 3553 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3554 .maxlen = sizeof(int),
3555 .mode = 0644,
6d9f239a 3556 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3557 },
f8572d8f 3558 { }
1da177e4
LT		 3559};
3560
2c8c1e72 3561struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3562{
3563 struct ctl_table *table;
3564
3565 table = kmemdup(ipv6_route_table_template,
3566 sizeof(ipv6_route_table_template),
3567 GFP_KERNEL);
5ee09105
YH		 3568
3569 if (table) {
3570 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3571 table[0].extra1 = net;
86393e52 3572 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3573 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3574 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3575 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3576 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3577 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3578 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3579 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3580 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3581
3582 /* Don't export sysctls to unprivileged users */
3583 if (net->user_ns != &init_user_ns)
3584 table[0].procname = NULL;
5ee09105
YH		 3585 }
3586
760f2d01
DL		 3587 return table;
3588}
1da177e4
LT		 3589#endif
3590
2c8c1e72 3591static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3592{
633d424b 3593 int ret = -ENOMEM;
8ed67789 3594
86393e52
AD		 3595 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3596 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3597
fc66f95c
ED		 3598 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3599 goto out_ip6_dst_ops;
3600
8ed67789
DL		 3601 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3602 sizeof(*net->ipv6.ip6_null_entry),
3603 GFP_KERNEL);
3604 if (!net->ipv6.ip6_null_entry)
fc66f95c 3605 goto out_ip6_dst_entries;
d8d1f30b 3606 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3607 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3608 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3609 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3610 ip6_template_metrics, true);
8ed67789
DL		 3611
3612#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3613 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3614 sizeof(*net->ipv6.ip6_prohibit_entry),
3615 GFP_KERNEL);
68fffc67
PZ		 3616 if (!net->ipv6.ip6_prohibit_entry)
3617 goto out_ip6_null_entry;
d8d1f30b 3618 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3619 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3620 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3621 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3622 ip6_template_metrics, true);
8ed67789
DL		 3623
3624 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3625 sizeof(*net->ipv6.ip6_blk_hole_entry),
3626 GFP_KERNEL);
68fffc67
PZ		 3627 if (!net->ipv6.ip6_blk_hole_entry)
3628 goto out_ip6_prohibit_entry;
d8d1f30b 3629 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3630 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3631 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3632 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3633 ip6_template_metrics, true);
8ed67789
DL		 3634#endif
3635
b339a47c
PZ		 3636 net->ipv6.sysctl.flush_delay = 0;
3637 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3638 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3639 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3640 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3641 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3642 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3643 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3644
6891a346
BT		 3645 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3646
8ed67789
DL		 3647 ret = 0;
3648out:
3649 return ret;
f2fc6a54 3650
68fffc67
PZ		 3651#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3652out_ip6_prohibit_entry:
3653 kfree(net->ipv6.ip6_prohibit_entry);
3654out_ip6_null_entry:
3655 kfree(net->ipv6.ip6_null_entry);
3656#endif
fc66f95c
ED		 3657out_ip6_dst_entries:
3658 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3659out_ip6_dst_ops:
f2fc6a54 3660 goto out;
cdb18761
DL		 3661}
3662
2c8c1e72 3663static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3664{
8ed67789
DL		 3665 kfree(net->ipv6.ip6_null_entry);
3666#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3667 kfree(net->ipv6.ip6_prohibit_entry);
3668 kfree(net->ipv6.ip6_blk_hole_entry);
3669#endif
41bb78b4 3670 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3671}
3672
d189634e
TG		 3673static int __net_init ip6_route_net_init_late(struct net *net)
3674{
3675#ifdef CONFIG_PROC_FS
d4beaa66
G		 3676 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3677 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3678#endif
3679 return 0;
3680}
3681
3682static void __net_exit ip6_route_net_exit_late(struct net *net)
3683{
3684#ifdef CONFIG_PROC_FS
ece31ffd
G		 3685 remove_proc_entry("ipv6_route", net->proc_net);
3686 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3687#endif
3688}
3689
cdb18761
DL		 3690static struct pernet_operations ip6_route_net_ops = {
3691 .init = ip6_route_net_init,
3692 .exit = ip6_route_net_exit,
3693};
3694
c3426b47
DM		 3695static int __net_init ipv6_inetpeer_init(struct net *net)
3696{
3697 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3698
3699 if (!bp)
3700 return -ENOMEM;
3701 inet_peer_base_init(bp);
3702 net->ipv6.peers = bp;
3703 return 0;
3704}
3705
3706static void __net_exit ipv6_inetpeer_exit(struct net *net)
3707{
3708 struct inet_peer_base *bp = net->ipv6.peers;
3709
3710 net->ipv6.peers = NULL;
56a6b248 3711 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3712 kfree(bp);
3713}
3714
2b823f72 3715static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3716 .init = ipv6_inetpeer_init,
3717 .exit = ipv6_inetpeer_exit,
3718};
3719
d189634e
TG		 3720static struct pernet_operations ip6_route_net_late_ops = {
3721 .init = ip6_route_net_init_late,
3722 .exit = ip6_route_net_exit_late,
3723};
3724
8ed67789
DL		 3725static struct notifier_block ip6_route_dev_notifier = {
3726 .notifier_call = ip6_route_dev_notify,
3727 .priority = 0,
3728};
3729
433d49c3 3730int __init ip6_route_init(void)
1da177e4 3731{
433d49c3 3732 int ret;
8d0b94af 3733 int cpu;
433d49c3 3734
9a7ec3a9
DL		 3735 ret = -ENOMEM;
3736 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3737 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3738 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3739 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3740 goto out;
14e50e57 3741
fc66f95c 3742 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3743 if (ret)
bdb3289f 3744 goto out_kmem_cache;
bdb3289f 3745
c3426b47
DM		 3746 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3747 if (ret)
e8803b6c 3748 goto out_dst_entries;
2a0c451a 3749
7e52b33b
DM		 3750 ret = register_pernet_subsys(&ip6_route_net_ops);
3751 if (ret)
3752 goto out_register_inetpeer;
c3426b47 3753
5dc121e9
AE		 3754 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3755
8ed67789
DL		 3756 /* Registering of the loopback is done before this portion of code,
3757 * the loopback reference in rt6_info will not be taken, do it
3758 * manually for init_net */
d8d1f30b 3759 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3760 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3761 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3762 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3763 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3764 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3765 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3766 #endif
e8803b6c 3767 ret = fib6_init();
433d49c3 3768 if (ret)
8ed67789 3769 goto out_register_subsys;
433d49c3 3770
433d49c3
DL		 3771 ret = xfrm6_init();
3772 if (ret)
e8803b6c 3773 goto out_fib6_init;
c35b7e72 3774
433d49c3
DL		 3775 ret = fib6_rules_init();
3776 if (ret)
3777 goto xfrm6_init;
7e5449c2 3778
d189634e
TG		 3779 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3780 if (ret)
3781 goto fib6_rules_init;
3782
433d49c3 3783 ret = -ENOBUFS;
c7ac8679
GR		 3784 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3785 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3786 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3787 goto out_register_late_subsys;
c127ea2c 3788
8ed67789 3789 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3790 if (ret)
d189634e 3791 goto out_register_late_subsys;
8ed67789 3792
8d0b94af
MKL		 3793 for_each_possible_cpu(cpu) {
3794 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3795
3796 INIT_LIST_HEAD(&ul->head);
3797 spin_lock_init(&ul->lock);
3798 }
3799
433d49c3
DL		 3800out:
3801 return ret;
3802
d189634e
TG		 3803out_register_late_subsys:
3804 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3805fib6_rules_init:
433d49c3
DL		 3806 fib6_rules_cleanup();
3807xfrm6_init:
433d49c3 3808 xfrm6_fini();
2a0c451a
TG		 3809out_fib6_init:
3810 fib6_gc_cleanup();
8ed67789
DL		 3811out_register_subsys:
3812 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3813out_register_inetpeer:
3814 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3815out_dst_entries:
3816 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3817out_kmem_cache:
f2fc6a54 3818 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3819 goto out;
1da177e4
LT		 3820}
3821
3822void ip6_route_cleanup(void)
3823{
8ed67789 3824 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3825 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3826 fib6_rules_cleanup();
1da177e4 3827 xfrm6_fini();
1da177e4 3828 fib6_gc_cleanup();
c3426b47 3829 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3830 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3831 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3832 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3833}
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