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net: l3mdev: Add hook to output path
[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 1606out:
14972cbd
RP		 1607 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1608
1609 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
d33e4553
DM		 1610}
1611
3b00944c
YH		 1612static struct dst_entry *icmp6_dst_gc_list;
1613static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1614
3b00944c 1615struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1616 struct flowi6 *fl6)
1da177e4 1617{
87a11578 1618 struct dst_entry *dst;
1da177e4
LT		 1619 struct rt6_info *rt;
1620 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1621 struct net *net = dev_net(dev);
1da177e4 1622
38308473 1623 if (unlikely(!idev))
122bdf67 1624 return ERR_PTR(-ENODEV);
1da177e4 1625
ad706862 1626 rt = ip6_dst_alloc(net, dev, 0);
38308473 1627 if (unlikely(!rt)) {
1da177e4 1628 in6_dev_put(idev);
87a11578 1629 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1630 goto out;
1631 }
1632
8e2ec639
YZ		 1633 rt->dst.flags |= DST_HOST;
1634 rt->dst.output = ip6_output;
d8d1f30b 1635 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1636 rt->rt6i_gateway = fl6->daddr;
87a11578 1637 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1638 rt->rt6i_dst.plen = 128;
1639 rt->rt6i_idev = idev;
14edd87d 1640 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1641
3b00944c 1642 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1643 rt->dst.next = icmp6_dst_gc_list;
1644 icmp6_dst_gc_list = &rt->dst;
3b00944c 1645 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1646
5578689a 1647 fib6_force_start_gc(net);
1da177e4 1648
87a11578
DM		 1649 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1650
1da177e4 1651out:
87a11578 1652 return dst;
1da177e4
LT		 1653}
1654
3d0f24a7 1655int icmp6_dst_gc(void)
1da177e4 1656{
e9476e95 1657 struct dst_entry *dst, **pprev;
3d0f24a7 1658 int more = 0;
1da177e4 1659
3b00944c
YH		 1660 spin_lock_bh(&icmp6_dst_lock);
1661 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1662
1da177e4
LT		 1663 while ((dst = *pprev) != NULL) {
1664 if (!atomic_read(&dst->__refcnt)) {
1665 *pprev = dst->next;
1666 dst_free(dst);
1da177e4
LT		 1667 } else {
1668 pprev = &dst->next;
3d0f24a7 1669 ++more;
1da177e4
LT		 1670 }
1671 }
1672
3b00944c 1673 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1674
3d0f24a7 1675 return more;
1da177e4
LT		 1676}
1677
1e493d19
DM		 1678static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1679 void *arg)
1680{
1681 struct dst_entry *dst, **pprev;
1682
1683 spin_lock_bh(&icmp6_dst_lock);
1684 pprev = &icmp6_dst_gc_list;
1685 while ((dst = *pprev) != NULL) {
1686 struct rt6_info *rt = (struct rt6_info *) dst;
1687 if (func(rt, arg)) {
1688 *pprev = dst->next;
1689 dst_free(dst);
1690 } else {
1691 pprev = &dst->next;
1692 }
1693 }
1694 spin_unlock_bh(&icmp6_dst_lock);
1695}
1696
569d3645 1697static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1698{
86393e52 1699 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1700 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1701 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1702 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1703 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1704 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1705 int entries;
7019b78e 1706
fc66f95c 1707 entries = dst_entries_get_fast(ops);
49a18d86 1708 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1709 entries <= rt_max_size)
1da177e4
LT		 1710 goto out;
1711
6891a346 1712 net->ipv6.ip6_rt_gc_expire++;
14956643 1713 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1714 entries = dst_entries_get_slow(ops);
1715 if (entries < ops->gc_thresh)
7019b78e 1716 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1717out:
7019b78e 1718 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1719 return entries > rt_max_size;
1da177e4
LT		 1720}
1721
e715b6d3
FW		 1722static int ip6_convert_metrics(struct mx6_config *mxc,
1723 const struct fib6_config *cfg)
1724{
c3a8d947 1725 bool ecn_ca = false;
e715b6d3
FW		 1726 struct nlattr *nla;
1727 int remaining;
1728 u32 *mp;
1729
63159f29 1730 if (!cfg->fc_mx)
e715b6d3
FW		 1731 return 0;
1732
1733 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1734 if (unlikely(!mp))
1735 return -ENOMEM;
1736
1737 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1738 int type = nla_type(nla);
1bb14807 1739 u32 val;
e715b6d3 1740
1bb14807
DB		 1741 if (!type)
1742 continue;
1743 if (unlikely(type > RTAX_MAX))
1744 goto err;
ea697639 1745
1bb14807
DB		 1746 if (type == RTAX_CC_ALGO) {
1747 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1748
1bb14807 1749 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1750 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1751 if (val == TCP_CA_UNSPEC)
1752 goto err;
1753 } else {
1754 val = nla_get_u32(nla);
e715b6d3 1755 }
626abd59
PA		 1756 if (type == RTAX_HOPLIMIT && val > 255)
1757 val = 255;
b8d3e416
DB		 1758 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1759 goto err;
1bb14807
DB		 1760
1761 mp[type - 1] = val;
1762 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1763 }
1764
c3a8d947
DB		 1765 if (ecn_ca) {
1766 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1767 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1768 }
e715b6d3 1769
c3a8d947 1770 mxc->mx = mp;
e715b6d3
FW		 1771 return 0;
1772 err:
1773 kfree(mp);
1774 return -EINVAL;
1775}
1da177e4 1776
8c14586f
DA		 1777static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1778 struct fib6_config *cfg,
1779 const struct in6_addr *gw_addr)
1780{
1781 struct flowi6 fl6 = {
1782 .flowi6_oif = cfg->fc_ifindex,
1783 .daddr = *gw_addr,
1784 .saddr = cfg->fc_prefsrc,
1785 };
1786 struct fib6_table *table;
1787 struct rt6_info *rt;
48f1dcb5 1788 int flags = RT6_LOOKUP_F_IFACE;
8c14586f
DA		 1789
1790 table = fib6_get_table(net, cfg->fc_table);
1791 if (!table)
1792 return NULL;
1793
1794 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1795 flags |= RT6_LOOKUP_F_HAS_SADDR;
1796
1797 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1798
1799 /* if table lookup failed, fall back to full lookup */
1800 if (rt == net->ipv6.ip6_null_entry) {
1801 ip6_rt_put(rt);
1802 rt = NULL;
1803 }
1804
1805 return rt;
1806}
1807
8c5b83f0 1808static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1809{
5578689a 1810 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1811 struct rt6_info *rt = NULL;
1812 struct net_device *dev = NULL;
1813 struct inet6_dev *idev = NULL;
c71099ac 1814 struct fib6_table *table;
1da177e4 1815 int addr_type;
8c5b83f0 1816 int err = -EINVAL;
1da177e4 1817
86872cb5 1818 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1819 goto out;
1da177e4 1820#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1821 if (cfg->fc_src_len)
8c5b83f0 1822 goto out;
1da177e4 1823#endif
86872cb5 1824 if (cfg->fc_ifindex) {
1da177e4 1825 err = -ENODEV;
5578689a 1826 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1827 if (!dev)
1828 goto out;
1829 idev = in6_dev_get(dev);
1830 if (!idev)
1831 goto out;
1832 }
1833
86872cb5
TG		 1834 if (cfg->fc_metric == 0)
1835 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1836
d71314b4 1837 err = -ENOBUFS;
38308473
DM		 1838 if (cfg->fc_nlinfo.nlh &&
1839 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1840 table = fib6_get_table(net, cfg->fc_table);
38308473 1841 if (!table) {
f3213831 1842 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1843 table = fib6_new_table(net, cfg->fc_table);
1844 }
1845 } else {
1846 table = fib6_new_table(net, cfg->fc_table);
1847 }
38308473
DM		 1848
1849 if (!table)
c71099ac 1850 goto out;
c71099ac 1851
ad706862
MKL		 1852 rt = ip6_dst_alloc(net, NULL,
1853 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1854
38308473 1855 if (!rt) {
1da177e4
LT		 1856 err = -ENOMEM;
1857 goto out;
1858 }
1859
1716a961
G		 1860 if (cfg->fc_flags & RTF_EXPIRES)
1861 rt6_set_expires(rt, jiffies +
1862 clock_t_to_jiffies(cfg->fc_expires));
1863 else
1864 rt6_clean_expires(rt);
1da177e4 1865
86872cb5
TG		 1866 if (cfg->fc_protocol == RTPROT_UNSPEC)
1867 cfg->fc_protocol = RTPROT_BOOT;
1868 rt->rt6i_protocol = cfg->fc_protocol;
1869
1870 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1871
1872 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1873 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1874 else if (cfg->fc_flags & RTF_LOCAL)
1875 rt->dst.input = ip6_input;
1da177e4 1876 else
d8d1f30b 1877 rt->dst.input = ip6_forward;
1da177e4 1878
d8d1f30b 1879 rt->dst.output = ip6_output;
1da177e4 1880
19e42e45
RP		 1881 if (cfg->fc_encap) {
1882 struct lwtunnel_state *lwtstate;
1883
1884 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1885 cfg->fc_encap, AF_INET6, cfg,
1886 &lwtstate);
19e42e45
RP		 1887 if (err)
1888 goto out;
61adedf3
JB		 1889 rt->dst.lwtstate = lwtstate_get(lwtstate);
1890 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1891 rt->dst.lwtstate->orig_output = rt->dst.output;
1892 rt->dst.output = lwtunnel_output;
25368623 1893 }
61adedf3
JB		 1894 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1895 rt->dst.lwtstate->orig_input = rt->dst.input;
1896 rt->dst.input = lwtunnel_input;
25368623 1897 }
19e42e45
RP		 1898 }
1899
86872cb5
TG		 1900 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1901 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1902 if (rt->rt6i_dst.plen == 128)
e5fd387a 1903 rt->dst.flags |= DST_HOST;
e5fd387a 1904
1da177e4 1905#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1906 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1907 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1908#endif
1909
86872cb5 1910 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1911
1912 /* We cannot add true routes via loopback here,
1913 they would result in kernel looping; promote them to reject routes
1914 */
86872cb5 1915 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1916 (dev && (dev->flags & IFF_LOOPBACK) &&
1917 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1918 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1919 /* hold loopback dev/idev if we haven't done so. */
5578689a 1920 if (dev != net->loopback_dev) {
1da177e4
LT		 1921 if (dev) {
1922 dev_put(dev);
1923 in6_dev_put(idev);
1924 }
5578689a 1925 dev = net->loopback_dev;
1da177e4
LT		 1926 dev_hold(dev);
1927 idev = in6_dev_get(dev);
1928 if (!idev) {
1929 err = -ENODEV;
1930 goto out;
1931 }
1932 }
1da177e4 1933 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1934 switch (cfg->fc_type) {
1935 case RTN_BLACKHOLE:
1936 rt->dst.error = -EINVAL;
ede2059d 1937 rt->dst.output = dst_discard_out;
7150aede 1938 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1939 break;
1940 case RTN_PROHIBIT:
1941 rt->dst.error = -EACCES;
7150aede
K		 1942 rt->dst.output = ip6_pkt_prohibit_out;
1943 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1944 break;
b4949ab2 1945 case RTN_THROW:
0315e382 1946 case RTN_UNREACHABLE:
ef2c7d7b 1947 default:
7150aede 1948 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1949 : (cfg->fc_type == RTN_UNREACHABLE)
1950 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1951 rt->dst.output = ip6_pkt_discard_out;
1952 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1953 break;
1954 }
1da177e4
LT		 1955 goto install_route;
1956 }
1957
86872cb5 1958 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1959 const struct in6_addr *gw_addr;
1da177e4
LT		 1960 int gwa_type;
1961
86872cb5 1962 gw_addr = &cfg->fc_gateway;
330567b7 1963 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1964
1965 /* if gw_addr is local we will fail to detect this in case
1966 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1967 * will return already-added prefix route via interface that
1968 * prefix route was assigned to, which might be non-loopback.
1969 */
1970 err = -EINVAL;
330567b7
FW		 1971 if (ipv6_chk_addr_and_flags(net, gw_addr,
1972 gwa_type & IPV6_ADDR_LINKLOCAL ?
1973 dev : NULL, 0, 0))
48ed7b26
FW		 1974 goto out;
1975
4e3fd7a0 1976 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1977
1978 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
8c14586f 1979 struct rt6_info *grt = NULL;
1da177e4
LT		 1980
1981 /* IPv6 strictly inhibits using not link-local
1982 addresses as nexthop address.
1983 Otherwise, router will not able to send redirects.
1984 It is very good, but in some (rare!) circumstances
1985 (SIT, PtP, NBMA NOARP links) it is handy to allow
1986 some exceptions. --ANK
1987 */
38308473 1988 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1989 goto out;
1990
8c14586f
DA		 1991 if (cfg->fc_table)
1992 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1993
1994 if (!grt)
1995 grt = rt6_lookup(net, gw_addr, NULL,
1996 cfg->fc_ifindex, 1);
1da177e4
LT		 1997
1998 err = -EHOSTUNREACH;
38308473 1999 if (!grt)
1da177e4
LT		 2000 goto out;
2001 if (dev) {
d1918542 2002 if (dev != grt->dst.dev) {
94e187c0 2003 ip6_rt_put(grt);
1da177e4
LT		 2004 goto out;
2005 }
2006 } else {
d1918542 2007 dev = grt->dst.dev;
1da177e4
LT		 2008 idev = grt->rt6i_idev;
2009 dev_hold(dev);
2010 in6_dev_hold(grt->rt6i_idev);
2011 }
38308473 2012 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 2013 err = 0;
94e187c0 2014 ip6_rt_put(grt);
1da177e4
LT		 2015
2016 if (err)
2017 goto out;
2018 }
2019 err = -EINVAL;
38308473 2020 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2021 goto out;
2022 }
2023
2024 err = -ENODEV;
38308473 2025 if (!dev)
1da177e4
LT		 2026 goto out;
2027
c3968a85
DW		 2028 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2029 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2030 err = -EINVAL;
2031 goto out;
2032 }
4e3fd7a0 2033 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 2034 rt->rt6i_prefsrc.plen = 128;
2035 } else
2036 rt->rt6i_prefsrc.plen = 0;
2037
86872cb5 2038 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2039
2040install_route:
d8d1f30b 2041 rt->dst.dev = dev;
1da177e4 2042 rt->rt6i_idev = idev;
c71099ac 2043 rt->rt6i_table = table;
63152fc0 2044
c346dca1 2045 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2046
8c5b83f0 2047 return rt;
6b9ea5a6
RP		 2048out:
2049 if (dev)
2050 dev_put(dev);
2051 if (idev)
2052 in6_dev_put(idev);
2053 if (rt)
2054 dst_free(&rt->dst);
2055
8c5b83f0 2056 return ERR_PTR(err);
6b9ea5a6
RP		 2057}
2058
2059int ip6_route_add(struct fib6_config *cfg)
2060{
2061 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2062 struct rt6_info *rt;
6b9ea5a6
RP		 2063 int err;
2064
8c5b83f0
RP		 2065 rt = ip6_route_info_create(cfg);
2066 if (IS_ERR(rt)) {
2067 err = PTR_ERR(rt);
2068 rt = NULL;
6b9ea5a6 2069 goto out;
8c5b83f0 2070 }
6b9ea5a6 2071
e715b6d3
FW		 2072 err = ip6_convert_metrics(&mxc, cfg);
2073 if (err)
2074 goto out;
1da177e4 2075
e715b6d3
FW		 2076 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2077
2078 kfree(mxc.mx);
6b9ea5a6 2079
e715b6d3 2080 return err;
1da177e4 2081out:
1da177e4 2082 if (rt)
d8d1f30b 2083 dst_free(&rt->dst);
6b9ea5a6 2084
1da177e4
LT		 2085 return err;
2086}
2087
86872cb5 2088static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2089{
2090 int err;
c71099ac 2091 struct fib6_table *table;
d1918542 2092 struct net *net = dev_net(rt->dst.dev);
1da177e4 2093
8e3d5be7
MKL		 2094 if (rt == net->ipv6.ip6_null_entry ||
2095 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2096 err = -ENOENT;
2097 goto out;
2098 }
6c813a72 2099
c71099ac
TG		 2100 table = rt->rt6i_table;
2101 write_lock_bh(&table->tb6_lock);
86872cb5 2102 err = fib6_del(rt, info);
c71099ac 2103 write_unlock_bh(&table->tb6_lock);
1da177e4 2104
6825a26c 2105out:
94e187c0 2106 ip6_rt_put(rt);
1da177e4
LT		 2107 return err;
2108}
2109
e0a1ad73
TG		 2110int ip6_del_rt(struct rt6_info *rt)
2111{
4d1169c1 2112 struct nl_info info = {
d1918542 2113 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2114 };
528c4ceb 2115 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2116}
2117
86872cb5 2118static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2119{
c71099ac 2120 struct fib6_table *table;
1da177e4
LT		 2121 struct fib6_node *fn;
2122 struct rt6_info *rt;
2123 int err = -ESRCH;
2124
5578689a 2125 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2126 if (!table)
c71099ac
TG		 2127 return err;
2128
2129 read_lock_bh(&table->tb6_lock);
1da177e4 2130
c71099ac 2131 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2132 &cfg->fc_dst, cfg->fc_dst_len,
2133 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2134
1da177e4 2135 if (fn) {
d8d1f30b 2136 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2137 if ((rt->rt6i_flags & RTF_CACHE) &&
2138 !(cfg->fc_flags & RTF_CACHE))
2139 continue;
86872cb5 2140 if (cfg->fc_ifindex &&
d1918542
DM		 2141 (!rt->dst.dev ||
2142 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2143 continue;
86872cb5
TG		 2144 if (cfg->fc_flags & RTF_GATEWAY &&
2145 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2146 continue;
86872cb5 2147 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2148 continue;
d8d1f30b 2149 dst_hold(&rt->dst);
c71099ac 2150 read_unlock_bh(&table->tb6_lock);
1da177e4 2151
86872cb5 2152 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2153 }
2154 }
c71099ac 2155 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2156
2157 return err;
2158}
2159
6700c270 2160static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2161{
a6279458 2162 struct netevent_redirect netevent;
e8599ff4 2163 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2164 struct ndisc_options ndopts;
2165 struct inet6_dev *in6_dev;
2166 struct neighbour *neigh;
71bcdba0 2167 struct rd_msg *msg;
6e157b6a
DM		 2168 int optlen, on_link;
2169 u8 *lladdr;
e8599ff4 2170
29a3cad5 2171 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2172 optlen -= sizeof(*msg);
e8599ff4
DM		 2173
2174 if (optlen < 0) {
6e157b6a 2175 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2176 return;
2177 }
2178
71bcdba0 2179 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2180
71bcdba0 2181 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2182 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2183 return;
2184 }
2185
6e157b6a 2186 on_link = 0;
71bcdba0 2187 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2188 on_link = 1;
71bcdba0 2189 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2190 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2191 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2192 return;
2193 }
2194
2195 in6_dev = __in6_dev_get(skb->dev);
2196 if (!in6_dev)
2197 return;
2198 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2199 return;
2200
2201 /* RFC2461 8.1:
2202 * The IP source address of the Redirect MUST be the same as the current
2203 * first-hop router for the specified ICMP Destination Address.
2204 */
2205
f997c55c 2206 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2207 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2208 return;
2209 }
6e157b6a
DM		 2210
2211 lladdr = NULL;
e8599ff4
DM		 2212 if (ndopts.nd_opts_tgt_lladdr) {
2213 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2214 skb->dev);
2215 if (!lladdr) {
2216 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2217 return;
2218 }
2219 }
2220
6e157b6a 2221 rt = (struct rt6_info *) dst;
ec13ad1d 2222 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2223 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2224 return;
6e157b6a 2225 }
e8599ff4 2226
6e157b6a
DM		 2227 /* Redirect received -> path was valid.
2228 * Look, redirects are sent only in response to data packets,
2229 * so that this nexthop apparently is reachable. --ANK
2230 */
2231 dst_confirm(&rt->dst);
a6279458 2232
71bcdba0 2233 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2234 if (!neigh)
2235 return;
a6279458 2236
1da177e4
LT		 2237 /*
2238 * We have finally decided to accept it.
2239 */
2240
f997c55c 2241 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 2242 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2243 NEIGH_UPDATE_F_OVERRIDE|
2244 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 2245 NEIGH_UPDATE_F_ISROUTER)),
2246 NDISC_REDIRECT, &ndopts);
1da177e4 2247
83a09abd 2248 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2249 if (!nrt)
1da177e4
LT		 2250 goto out;
2251
2252 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2253 if (on_link)
2254 nrt->rt6i_flags &= ~RTF_GATEWAY;
2255
4e3fd7a0 2256 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2257
40e22e8f 2258 if (ip6_ins_rt(nrt))
1da177e4
LT		 2259 goto out;
2260
d8d1f30b
CG		 2261 netevent.old = &rt->dst;
2262 netevent.new = &nrt->dst;
71bcdba0 2263 netevent.daddr = &msg->dest;
60592833 2264 netevent.neigh = neigh;
8d71740c
TT		 2265 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2266
38308473 2267 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2268 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2269 ip6_del_rt(rt);
1da177e4
LT		 2270 }
2271
2272out:
e8599ff4 2273 neigh_release(neigh);
6e157b6a
DM		 2274}
2275
1da177e4
LT		 2276/*
2277 * Misc support functions
2278 */
2279
4b32b5ad
MKL		 2280static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2281{
2282 BUG_ON(from->dst.from);
2283
2284 rt->rt6i_flags &= ~RTF_EXPIRES;
2285 dst_hold(&from->dst);
2286 rt->dst.from = &from->dst;
2287 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2288}
2289
83a09abd
MKL		 2290static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2291{
2292 rt->dst.input = ort->dst.input;
2293 rt->dst.output = ort->dst.output;
2294 rt->rt6i_dst = ort->rt6i_dst;
2295 rt->dst.error = ort->dst.error;
2296 rt->rt6i_idev = ort->rt6i_idev;
2297 if (rt->rt6i_idev)
2298 in6_dev_hold(rt->rt6i_idev);
2299 rt->dst.lastuse = jiffies;
2300 rt->rt6i_gateway = ort->rt6i_gateway;
2301 rt->rt6i_flags = ort->rt6i_flags;
2302 rt6_set_from(rt, ort);
2303 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2304#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2305 rt->rt6i_src = ort->rt6i_src;
1da177e4 2306#endif
83a09abd
MKL		 2307 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2308 rt->rt6i_table = ort->rt6i_table;
61adedf3 2309 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2310}
2311
70ceb4f5 2312#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2313static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2314 const struct in6_addr *prefix, int prefixlen,
2315 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2316{
2317 struct fib6_node *fn;
2318 struct rt6_info *rt = NULL;
c71099ac
TG		 2319 struct fib6_table *table;
2320
efa2cea0 2321 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2322 if (!table)
c71099ac 2323 return NULL;
70ceb4f5 2324
5744dd9b 2325 read_lock_bh(&table->tb6_lock);
67ba4152 2326 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2327 if (!fn)
2328 goto out;
2329
d8d1f30b 2330 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2331 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2332 continue;
2333 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2334 continue;
2335 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2336 continue;
d8d1f30b 2337 dst_hold(&rt->dst);
70ceb4f5
YH		 2338 break;
2339 }
2340out:
5744dd9b 2341 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2342 return rt;
2343}
2344
efa2cea0 2345static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2346 const struct in6_addr *prefix, int prefixlen,
2347 const struct in6_addr *gwaddr, int ifindex,
95c96174 2348 unsigned int pref)
70ceb4f5 2349{
86872cb5 2350 struct fib6_config cfg = {
238fc7ea 2351 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2352 .fc_ifindex = ifindex,
2353 .fc_dst_len = prefixlen,
2354 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2355 RTF_UP | RTF_PREF(pref),
15e47304 2356 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2357 .fc_nlinfo.nlh = NULL,
2358 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2359 };
2360
ca254490 2361 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2362 cfg.fc_dst = *prefix;
2363 cfg.fc_gateway = *gwaddr;
70ceb4f5 2364
e317da96
YH		 2365 /* We should treat it as a default route if prefix length is 0. */
2366 if (!prefixlen)
86872cb5 2367 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2368
86872cb5 2369 ip6_route_add(&cfg);
70ceb4f5 2370
efa2cea0 2371 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2372}
2373#endif
2374
b71d1d42 2375struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2376{
1da177e4 2377 struct rt6_info *rt;
c71099ac 2378 struct fib6_table *table;
1da177e4 2379
c346dca1 2380 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2381 if (!table)
c71099ac 2382 return NULL;
1da177e4 2383
5744dd9b 2384 read_lock_bh(&table->tb6_lock);
67ba4152 2385 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2386 if (dev == rt->dst.dev &&
045927ff 2387 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2388 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2389 break;
2390 }
2391 if (rt)
d8d1f30b 2392 dst_hold(&rt->dst);
5744dd9b 2393 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2394 return rt;
2395}
2396
b71d1d42 2397struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2398 struct net_device *dev,
2399 unsigned int pref)
1da177e4 2400{
86872cb5 2401 struct fib6_config cfg = {
ca254490 2402 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2403 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2404 .fc_ifindex = dev->ifindex,
2405 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2406 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2407 .fc_nlinfo.portid = 0,
5578689a 2408 .fc_nlinfo.nlh = NULL,
c346dca1 2409 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2410 };
1da177e4 2411
4e3fd7a0 2412 cfg.fc_gateway = *gwaddr;
1da177e4 2413
86872cb5 2414 ip6_route_add(&cfg);
1da177e4 2415
1da177e4
LT		 2416 return rt6_get_dflt_router(gwaddr, dev);
2417}
2418
7b4da532 2419void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2420{
2421 struct rt6_info *rt;
c71099ac
TG		 2422 struct fib6_table *table;
2423
2424 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2425 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2426 if (!table)
c71099ac 2427 return;
1da177e4
LT		 2428
2429restart:
c71099ac 2430 read_lock_bh(&table->tb6_lock);
d8d1f30b 2431 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2432 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2433 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2434 dst_hold(&rt->dst);
c71099ac 2435 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2436 ip6_del_rt(rt);
1da177e4
LT		 2437 goto restart;
2438 }
2439 }
c71099ac 2440 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2441}
2442
5578689a
DL		 2443static void rtmsg_to_fib6_config(struct net *net,
2444 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2445 struct fib6_config *cfg)
2446{
2447 memset(cfg, 0, sizeof(*cfg));
2448
ca254490
DA		 2449 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2450 : RT6_TABLE_MAIN;
86872cb5
TG		 2451 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2452 cfg->fc_metric = rtmsg->rtmsg_metric;
2453 cfg->fc_expires = rtmsg->rtmsg_info;
2454 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2455 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2456 cfg->fc_flags = rtmsg->rtmsg_flags;
2457
5578689a 2458 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2459
4e3fd7a0
AD		 2460 cfg->fc_dst = rtmsg->rtmsg_dst;
2461 cfg->fc_src = rtmsg->rtmsg_src;
2462 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2463}
2464
5578689a 2465int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2466{
86872cb5 2467 struct fib6_config cfg;
1da177e4
LT		 2468 struct in6_rtmsg rtmsg;
2469 int err;
2470
67ba4152 2471 switch (cmd) {
1da177e4
LT		 2472 case SIOCADDRT: /* Add a route */
2473 case SIOCDELRT: /* Delete a route */
af31f412 2474 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2475 return -EPERM;
2476 err = copy_from_user(&rtmsg, arg,
2477 sizeof(struct in6_rtmsg));
2478 if (err)
2479 return -EFAULT;
86872cb5 2480
5578689a 2481 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2482
1da177e4
LT		 2483 rtnl_lock();
2484 switch (cmd) {
2485 case SIOCADDRT:
86872cb5 2486 err = ip6_route_add(&cfg);
1da177e4
LT		 2487 break;
2488 case SIOCDELRT:
86872cb5 2489 err = ip6_route_del(&cfg);
1da177e4
LT		 2490 break;
2491 default:
2492 err = -EINVAL;
2493 }
2494 rtnl_unlock();
2495
2496 return err;
3ff50b79 2497 }
1da177e4
LT		 2498
2499 return -EINVAL;
2500}
2501
2502/*
2503 * Drop the packet on the floor
2504 */
2505
d5fdd6ba 2506static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2507{
612f09e8 2508 int type;
adf30907 2509 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2510 switch (ipstats_mib_noroutes) {
2511 case IPSTATS_MIB_INNOROUTES:
0660e03f 2512 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2513 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2514 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2515 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2516 break;
2517 }
2518 /* FALLTHROUGH */
2519 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2520 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2521 ipstats_mib_noroutes);
612f09e8
YH		 2522 break;
2523 }
3ffe533c 2524 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2525 kfree_skb(skb);
2526 return 0;
2527}
2528
9ce8ade0
TG		 2529static int ip6_pkt_discard(struct sk_buff *skb)
2530{
612f09e8 2531 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2532}
2533
ede2059d 2534static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2535{
adf30907 2536 skb->dev = skb_dst(skb)->dev;
612f09e8 2537 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2538}
2539
9ce8ade0
TG		 2540static int ip6_pkt_prohibit(struct sk_buff *skb)
2541{
612f09e8 2542 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2543}
2544
ede2059d 2545static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2546{
adf30907 2547 skb->dev = skb_dst(skb)->dev;
612f09e8 2548 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2549}
2550
1da177e4
LT		 2551/*
2552 * Allocate a dst for local (unicast / anycast) address.
2553 */
2554
2555struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2556 const struct in6_addr *addr,
8f031519 2557 bool anycast)
1da177e4 2558{
ca254490 2559 u32 tb_id;
c346dca1 2560 struct net *net = dev_net(idev->dev);
a3300ef4 2561 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2562 DST_NOCOUNT);
a3300ef4 2563 if (!rt)
1da177e4
LT		 2564 return ERR_PTR(-ENOMEM);
2565
1da177e4
LT		 2566 in6_dev_hold(idev);
2567
11d53b49 2568 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2569 rt->dst.input = ip6_input;
2570 rt->dst.output = ip6_output;
1da177e4 2571 rt->rt6i_idev = idev;
1da177e4
LT		 2572
2573 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2574 if (anycast)
2575 rt->rt6i_flags |= RTF_ANYCAST;
2576 else
1da177e4 2577 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2578
550bab42 2579 rt->rt6i_gateway = *addr;
4e3fd7a0 2580 rt->rt6i_dst.addr = *addr;
1da177e4 2581 rt->rt6i_dst.plen = 128;
ca254490
DA		 2582 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2583 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2584 rt->dst.flags |= DST_NOCACHE;
1da177e4 2585
d8d1f30b 2586 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2587
2588 return rt;
2589}
2590
c3968a85
DW		 2591/* remove deleted ip from prefsrc entries */
2592struct arg_dev_net_ip {
2593 struct net_device *dev;
2594 struct net *net;
2595 struct in6_addr *addr;
2596};
2597
2598static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2599{
2600 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2601 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2602 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2603
d1918542 2604 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2605 rt != net->ipv6.ip6_null_entry &&
2606 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2607 /* remove prefsrc entry */
2608 rt->rt6i_prefsrc.plen = 0;
2609 }
2610 return 0;
2611}
2612
2613void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2614{
2615 struct net *net = dev_net(ifp->idev->dev);
2616 struct arg_dev_net_ip adni = {
2617 .dev = ifp->idev->dev,
2618 .net = net,
2619 .addr = &ifp->addr,
2620 };
0c3584d5 2621 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2622}
2623
be7a010d
DJ		 2624#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2625#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2626
2627/* Remove routers and update dst entries when gateway turn into host. */
2628static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2629{
2630 struct in6_addr *gateway = (struct in6_addr *)arg;
2631
2632 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2633 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2634 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2635 return -1;
2636 }
2637 return 0;
2638}
2639
2640void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2641{
2642 fib6_clean_all(net, fib6_clean_tohost, gateway);
2643}
2644
8ed67789
DL		 2645struct arg_dev_net {
2646 struct net_device *dev;
2647 struct net *net;
2648};
2649
1da177e4
LT		 2650static int fib6_ifdown(struct rt6_info *rt, void *arg)
2651{
bc3ef660 2652 const struct arg_dev_net *adn = arg;
2653 const struct net_device *dev = adn->dev;
8ed67789 2654
d1918542 2655 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2656 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2657 return -1;
c159d30c 2658
1da177e4
LT		 2659 return 0;
2660}
2661
f3db4851 2662void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2663{
8ed67789
DL		 2664 struct arg_dev_net adn = {
2665 .dev = dev,
2666 .net = net,
2667 };
2668
0c3584d5 2669 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2670 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2671 if (dev)
2672 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2673}
2674
95c96174 2675struct rt6_mtu_change_arg {
1da177e4 2676 struct net_device *dev;
95c96174 2677 unsigned int mtu;
1da177e4
LT		 2678};
2679
2680static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2681{
2682 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2683 struct inet6_dev *idev;
2684
2685 /* In IPv6 pmtu discovery is not optional,
2686 so that RTAX_MTU lock cannot disable it.
2687 We still use this lock to block changes
2688 caused by addrconf/ndisc.
2689 */
2690
2691 idev = __in6_dev_get(arg->dev);
38308473 2692 if (!idev)
1da177e4
LT		 2693 return 0;
2694
2695 /* For administrative MTU increase, there is no way to discover
2696 IPv6 PMTU increase, so PMTU increase should be updated here.
2697 Since RFC 1981 doesn't include administrative MTU increase
2698 update PMTU increase is a MUST. (i.e. jumbo frame)
2699 */
2700 /*
2701 If new MTU is less than route PMTU, this new MTU will be the
2702 lowest MTU in the path, update the route PMTU to reflect PMTU
2703 decreases; if new MTU is greater than route PMTU, and the
2704 old MTU is the lowest MTU in the path, update the route PMTU
2705 to reflect the increase. In this case if the other nodes' MTU
2706 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2707 PMTU discouvery.
2708 */
d1918542 2709 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2710 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2711 if (rt->rt6i_flags & RTF_CACHE) {
2712 /* For RTF_CACHE with rt6i_pmtu == 0
2713 * (i.e. a redirected route),
2714 * the metrics of its rt->dst.from has already
2715 * been updated.
2716 */
2717 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2718 rt->rt6i_pmtu = arg->mtu;
2719 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2720 (dst_mtu(&rt->dst) < arg->mtu &&
2721 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2722 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2723 }
566cfd8f 2724 }
1da177e4
LT		 2725 return 0;
2726}
2727
95c96174 2728void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2729{
c71099ac
TG		 2730 struct rt6_mtu_change_arg arg = {
2731 .dev = dev,
2732 .mtu = mtu,
2733 };
1da177e4 2734
0c3584d5 2735 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2736}
2737
ef7c79ed 2738static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2739 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2740 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2741 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2742 [RTA_PRIORITY] = { .type = NLA_U32 },
2743 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2744 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2745 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2746 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2747 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2748 [RTA_EXPIRES] = { .type = NLA_U32 },
86872cb5
TG		 2749};
2750
2751static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2752 struct fib6_config *cfg)
1da177e4 2753{
86872cb5
TG		 2754 struct rtmsg *rtm;
2755 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2756 unsigned int pref;
86872cb5 2757 int err;
1da177e4 2758
86872cb5
TG		 2759 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2760 if (err < 0)
2761 goto errout;
1da177e4 2762
86872cb5
TG		 2763 err = -EINVAL;
2764 rtm = nlmsg_data(nlh);
2765 memset(cfg, 0, sizeof(*cfg));
2766
2767 cfg->fc_table = rtm->rtm_table;
2768 cfg->fc_dst_len = rtm->rtm_dst_len;
2769 cfg->fc_src_len = rtm->rtm_src_len;
2770 cfg->fc_flags = RTF_UP;
2771 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2772 cfg->fc_type = rtm->rtm_type;
86872cb5 2773
ef2c7d7b
ND		 2774 if (rtm->rtm_type == RTN_UNREACHABLE ||
2775 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2776 rtm->rtm_type == RTN_PROHIBIT ||
2777 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2778 cfg->fc_flags |= RTF_REJECT;
2779
ab79ad14
MŻ		 2780 if (rtm->rtm_type == RTN_LOCAL)
2781 cfg->fc_flags |= RTF_LOCAL;
2782
1f56a01f
MKL		 2783 if (rtm->rtm_flags & RTM_F_CLONED)
2784 cfg->fc_flags |= RTF_CACHE;
2785
15e47304 2786 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2787 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2788 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2789
2790 if (tb[RTA_GATEWAY]) {
67b61f6c 2791 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2792 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2793 }
86872cb5
TG		 2794
2795 if (tb[RTA_DST]) {
2796 int plen = (rtm->rtm_dst_len + 7) >> 3;
2797
2798 if (nla_len(tb[RTA_DST]) < plen)
2799 goto errout;
2800
2801 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2802 }
86872cb5
TG		 2803
2804 if (tb[RTA_SRC]) {
2805 int plen = (rtm->rtm_src_len + 7) >> 3;
2806
2807 if (nla_len(tb[RTA_SRC]) < plen)
2808 goto errout;
2809
2810 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2811 }
86872cb5 2812
c3968a85 2813 if (tb[RTA_PREFSRC])
67b61f6c 2814 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2815
86872cb5
TG		 2816 if (tb[RTA_OIF])
2817 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2818
2819 if (tb[RTA_PRIORITY])
2820 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2821
2822 if (tb[RTA_METRICS]) {
2823 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2824 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2825 }
86872cb5
TG		 2826
2827 if (tb[RTA_TABLE])
2828 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2829
51ebd318
ND		 2830 if (tb[RTA_MULTIPATH]) {
2831 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2832 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2833 }
2834
c78ba6d6
LR		 2835 if (tb[RTA_PREF]) {
2836 pref = nla_get_u8(tb[RTA_PREF]);
2837 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2838 pref != ICMPV6_ROUTER_PREF_HIGH)
2839 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2840 cfg->fc_flags |= RTF_PREF(pref);
2841 }
2842
19e42e45
RP		 2843 if (tb[RTA_ENCAP])
2844 cfg->fc_encap = tb[RTA_ENCAP];
2845
2846 if (tb[RTA_ENCAP_TYPE])
2847 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2848
32bc201e
XL		 2849 if (tb[RTA_EXPIRES]) {
2850 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2851
2852 if (addrconf_finite_timeout(timeout)) {
2853 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2854 cfg->fc_flags |= RTF_EXPIRES;
2855 }
2856 }
2857
86872cb5
TG		 2858 err = 0;
2859errout:
2860 return err;
1da177e4
LT		 2861}
2862
6b9ea5a6
RP		 2863struct rt6_nh {
2864 struct rt6_info *rt6_info;
2865 struct fib6_config r_cfg;
2866 struct mx6_config mxc;
2867 struct list_head next;
2868};
2869
2870static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2871{
2872 struct rt6_nh *nh;
2873
2874 list_for_each_entry(nh, rt6_nh_list, next) {
2875 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2876 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2877 nh->r_cfg.fc_ifindex);
2878 }
2879}
2880
2881static int ip6_route_info_append(struct list_head *rt6_nh_list,
2882 struct rt6_info *rt, struct fib6_config *r_cfg)
2883{
2884 struct rt6_nh *nh;
2885 struct rt6_info *rtnh;
2886 int err = -EEXIST;
2887
2888 list_for_each_entry(nh, rt6_nh_list, next) {
2889 /* check if rt6_info already exists */
2890 rtnh = nh->rt6_info;
2891
2892 if (rtnh->dst.dev == rt->dst.dev &&
2893 rtnh->rt6i_idev == rt->rt6i_idev &&
2894 ipv6_addr_equal(&rtnh->rt6i_gateway,
2895 &rt->rt6i_gateway))
2896 return err;
2897 }
2898
2899 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2900 if (!nh)
2901 return -ENOMEM;
2902 nh->rt6_info = rt;
2903 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2904 if (err) {
2905 kfree(nh);
2906 return err;
2907 }
2908 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2909 list_add_tail(&nh->next, rt6_nh_list);
2910
2911 return 0;
2912}
2913
2914static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2915{
2916 struct fib6_config r_cfg;
2917 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2918 struct rt6_info *rt;
2919 struct rt6_nh *err_nh;
2920 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2921 int remaining;
2922 int attrlen;
6b9ea5a6
RP		 2923 int err = 1;
2924 int nhn = 0;
2925 int replace = (cfg->fc_nlinfo.nlh &&
2926 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2927 LIST_HEAD(rt6_nh_list);
51ebd318 2928
35f1b4e9 2929 remaining = cfg->fc_mp_len;
51ebd318 2930 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2931
6b9ea5a6
RP		 2932 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2933 * rt6_info structs per nexthop
2934 */
51ebd318
ND		 2935 while (rtnh_ok(rtnh, remaining)) {
2936 memcpy(&r_cfg, cfg, sizeof(*cfg));
2937 if (rtnh->rtnh_ifindex)
2938 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2939
2940 attrlen = rtnh_attrlen(rtnh);
2941 if (attrlen > 0) {
2942 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2943
2944 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2945 if (nla) {
67b61f6c 2946 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2947 r_cfg.fc_flags |= RTF_GATEWAY;
2948 }
19e42e45
RP		 2949 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2950 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2951 if (nla)
2952 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2953 }
6b9ea5a6 2954
8c5b83f0
RP		 2955 rt = ip6_route_info_create(&r_cfg);
2956 if (IS_ERR(rt)) {
2957 err = PTR_ERR(rt);
2958 rt = NULL;
6b9ea5a6 2959 goto cleanup;
8c5b83f0 2960 }
6b9ea5a6
RP		 2961
2962 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2963 if (err) {
6b9ea5a6
RP		 2964 dst_free(&rt->dst);
2965 goto cleanup;
2966 }
2967
2968 rtnh = rtnh_next(rtnh, &remaining);
2969 }
2970
2971 err_nh = NULL;
2972 list_for_each_entry(nh, &rt6_nh_list, next) {
2973 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2974 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2975 nh->rt6_info = NULL;
2976 if (err) {
2977 if (replace && nhn)
2978 ip6_print_replace_route_err(&rt6_nh_list);
2979 err_nh = nh;
2980 goto add_errout;
51ebd318 2981 }
6b9ea5a6 2982
1a72418b 2983 /* Because each route is added like a single route we remove
27596472
MK		 2984 * these flags after the first nexthop: if there is a collision,
2985 * we have already failed to add the first nexthop:
2986 * fib6_add_rt2node() has rejected it; when replacing, old
2987 * nexthops have been replaced by first new, the rest should
2988 * be added to it.
1a72418b 2989 */
27596472
MK		 2990 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2991 NLM_F_REPLACE);
6b9ea5a6
RP		 2992 nhn++;
2993 }
2994
2995 goto cleanup;
2996
2997add_errout:
2998 /* Delete routes that were already added */
2999 list_for_each_entry(nh, &rt6_nh_list, next) {
3000 if (err_nh == nh)
3001 break;
3002 ip6_route_del(&nh->r_cfg);
3003 }
3004
3005cleanup:
3006 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3007 if (nh->rt6_info)
3008 dst_free(&nh->rt6_info->dst);
52fe51f8 3009 kfree(nh->mxc.mx);
6b9ea5a6
RP		 3010 list_del(&nh->next);
3011 kfree(nh);
3012 }
3013
3014 return err;
3015}
3016
3017static int ip6_route_multipath_del(struct fib6_config *cfg)
3018{
3019 struct fib6_config r_cfg;
3020 struct rtnexthop *rtnh;
3021 int remaining;
3022 int attrlen;
3023 int err = 1, last_err = 0;
3024
3025 remaining = cfg->fc_mp_len;
3026 rtnh = (struct rtnexthop *)cfg->fc_mp;
3027
3028 /* Parse a Multipath Entry */
3029 while (rtnh_ok(rtnh, remaining)) {
3030 memcpy(&r_cfg, cfg, sizeof(*cfg));
3031 if (rtnh->rtnh_ifindex)
3032 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3033
3034 attrlen = rtnh_attrlen(rtnh);
3035 if (attrlen > 0) {
3036 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3037
3038 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3039 if (nla) {
3040 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3041 r_cfg.fc_flags |= RTF_GATEWAY;
3042 }
3043 }
3044 err = ip6_route_del(&r_cfg);
3045 if (err)
3046 last_err = err;
3047
51ebd318
ND		 3048 rtnh = rtnh_next(rtnh, &remaining);
3049 }
3050
3051 return last_err;
3052}
3053
67ba4152 3054static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3055{
86872cb5
TG		 3056 struct fib6_config cfg;
3057 int err;
1da177e4 3058
86872cb5
TG		 3059 err = rtm_to_fib6_config(skb, nlh, &cfg);
3060 if (err < 0)
3061 return err;
3062
51ebd318 3063 if (cfg.fc_mp)
6b9ea5a6 3064 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3065 else
3066 return ip6_route_del(&cfg);
1da177e4
LT		 3067}
3068
67ba4152 3069static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3070{
86872cb5
TG		 3071 struct fib6_config cfg;
3072 int err;
1da177e4 3073
86872cb5
TG		 3074 err = rtm_to_fib6_config(skb, nlh, &cfg);
3075 if (err < 0)
3076 return err;
3077
51ebd318 3078 if (cfg.fc_mp)
6b9ea5a6 3079 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3080 else
3081 return ip6_route_add(&cfg);
1da177e4
LT		 3082}
3083
19e42e45 3084static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3085{
3086 return NLMSG_ALIGN(sizeof(struct rtmsg))
3087 + nla_total_size(16) /* RTA_SRC */
3088 + nla_total_size(16) /* RTA_DST */
3089 + nla_total_size(16) /* RTA_GATEWAY */
3090 + nla_total_size(16) /* RTA_PREFSRC */
3091 + nla_total_size(4) /* RTA_TABLE */
3092 + nla_total_size(4) /* RTA_IIF */
3093 + nla_total_size(4) /* RTA_OIF */
3094 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3095 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3096 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3097 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3098 + nla_total_size(1) /* RTA_PREF */
61adedf3 3099 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3100}
3101
191cd582
BH		 3102static int rt6_fill_node(struct net *net,
3103 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3104 struct in6_addr *dst, struct in6_addr *src,
15e47304 3105 int iif, int type, u32 portid, u32 seq,
7bc570c8 3106 int prefix, int nowait, unsigned int flags)
1da177e4 3107{
4b32b5ad 3108 u32 metrics[RTAX_MAX];
1da177e4 3109 struct rtmsg *rtm;
2d7202bf 3110 struct nlmsghdr *nlh;
e3703b3d 3111 long expires;
9e762a4a 3112 u32 table;
1da177e4
LT		 3113
3114 if (prefix) { /* user wants prefix routes only */
3115 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3116 /* success since this is not a prefix route */
3117 return 1;
3118 }
3119 }
3120
15e47304 3121 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3122 if (!nlh)
26932566 3123 return -EMSGSIZE;
2d7202bf
TG		 3124
3125 rtm = nlmsg_data(nlh);
1da177e4
LT		 3126 rtm->rtm_family = AF_INET6;
3127 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3128 rtm->rtm_src_len = rt->rt6i_src.plen;
3129 rtm->rtm_tos = 0;
c71099ac 3130 if (rt->rt6i_table)
9e762a4a 3131 table = rt->rt6i_table->tb6_id;
c71099ac 3132 else
9e762a4a
PM		 3133 table = RT6_TABLE_UNSPEC;
3134 rtm->rtm_table = table;
c78679e8
DM		 3135 if (nla_put_u32(skb, RTA_TABLE, table))
3136 goto nla_put_failure;
ef2c7d7b
ND		 3137 if (rt->rt6i_flags & RTF_REJECT) {
3138 switch (rt->dst.error) {
3139 case -EINVAL:
3140 rtm->rtm_type = RTN_BLACKHOLE;
3141 break;
3142 case -EACCES:
3143 rtm->rtm_type = RTN_PROHIBIT;
3144 break;
b4949ab2
ND		 3145 case -EAGAIN:
3146 rtm->rtm_type = RTN_THROW;
3147 break;
ef2c7d7b
ND		 3148 default:
3149 rtm->rtm_type = RTN_UNREACHABLE;
3150 break;
3151 }
3152 }
38308473 3153 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3154 rtm->rtm_type = RTN_LOCAL;
d1918542 3155 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3156 rtm->rtm_type = RTN_LOCAL;
3157 else
3158 rtm->rtm_type = RTN_UNICAST;
3159 rtm->rtm_flags = 0;
35103d11 3160 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3161 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3162 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3163 rtm->rtm_flags |= RTNH_F_DEAD;
3164 }
1da177e4
LT		 3165 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3166 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3167 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3168 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3169 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3170 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3171 rtm->rtm_protocol = RTPROT_RA;
3172 else
3173 rtm->rtm_protocol = RTPROT_KERNEL;
3174 }
1da177e4 3175
38308473 3176 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3177 rtm->rtm_flags |= RTM_F_CLONED;
3178
3179 if (dst) {
930345ea 3180 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3181 goto nla_put_failure;
1ab1457c 3182 rtm->rtm_dst_len = 128;
1da177e4 3183 } else if (rtm->rtm_dst_len)
930345ea 3184 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3185 goto nla_put_failure;
1da177e4
LT		 3186#ifdef CONFIG_IPV6_SUBTREES
3187 if (src) {
930345ea 3188 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3189 goto nla_put_failure;
1ab1457c 3190 rtm->rtm_src_len = 128;
c78679e8 3191 } else if (rtm->rtm_src_len &&
930345ea 3192 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3193 goto nla_put_failure;
1da177e4 3194#endif
7bc570c8
YH		 3195 if (iif) {
3196#ifdef CONFIG_IPV6_MROUTE
3197 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3198 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3199 if (err <= 0) {
3200 if (!nowait) {
3201 if (err == 0)
3202 return 0;
3203 goto nla_put_failure;
3204 } else {
3205 if (err == -EMSGSIZE)
3206 goto nla_put_failure;
3207 }
3208 }
3209 } else
3210#endif
c78679e8
DM		 3211 if (nla_put_u32(skb, RTA_IIF, iif))
3212 goto nla_put_failure;
7bc570c8 3213 } else if (dst) {
1da177e4 3214 struct in6_addr saddr_buf;
c78679e8 3215 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3216 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3217 goto nla_put_failure;
1da177e4 3218 }
2d7202bf 3219
c3968a85
DW		 3220 if (rt->rt6i_prefsrc.plen) {
3221 struct in6_addr saddr_buf;
4e3fd7a0 3222 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3223 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3224 goto nla_put_failure;
c3968a85
DW		 3225 }
3226
4b32b5ad
MKL		 3227 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3228 if (rt->rt6i_pmtu)
3229 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3230 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3231 goto nla_put_failure;
3232
dd0cbf29 3233 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3234 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3235 goto nla_put_failure;
94f826b8 3236 }
2d7202bf 3237
c78679e8
DM		 3238 if (rt->dst.dev &&
3239 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3240 goto nla_put_failure;
3241 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3242 goto nla_put_failure;
8253947e
LW		 3243
3244 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3245
87a50699 3246 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3247 goto nla_put_failure;
2d7202bf 3248
c78ba6d6
LR		 3249 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3250 goto nla_put_failure;
3251
61adedf3 3252 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3253
053c095a
JB		 3254 nlmsg_end(skb, nlh);
3255 return 0;
2d7202bf
TG		 3256
3257nla_put_failure:
26932566
PM		 3258 nlmsg_cancel(skb, nlh);
3259 return -EMSGSIZE;
1da177e4
LT		 3260}
3261
1b43af54 3262int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3263{
3264 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3265 int prefix;
3266
2d7202bf
TG		 3267 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3268 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3269 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3270 } else
3271 prefix = 0;
3272
191cd582
BH		 3273 return rt6_fill_node(arg->net,
3274 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3275 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3276 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3277}
3278
67ba4152 3279static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3280{
3b1e0a65 3281 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3282 struct nlattr *tb[RTA_MAX+1];
3283 struct rt6_info *rt;
1da177e4 3284 struct sk_buff *skb;
ab364a6f 3285 struct rtmsg *rtm;
4c9483b2 3286 struct flowi6 fl6;
72331bc0 3287 int err, iif = 0, oif = 0;
1da177e4 3288
ab364a6f
TG		 3289 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3290 if (err < 0)
3291 goto errout;
1da177e4 3292
ab364a6f 3293 err = -EINVAL;
4c9483b2 3294 memset(&fl6, 0, sizeof(fl6));
38b7097b
HFS		 3295 rtm = nlmsg_data(nlh);
3296 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
1da177e4 3297
ab364a6f
TG		 3298 if (tb[RTA_SRC]) {
3299 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3300 goto errout;
3301
4e3fd7a0 3302 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3303 }
3304
3305 if (tb[RTA_DST]) {
3306 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3307 goto errout;
3308
4e3fd7a0 3309 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3310 }
3311
3312 if (tb[RTA_IIF])
3313 iif = nla_get_u32(tb[RTA_IIF]);
3314
3315 if (tb[RTA_OIF])
72331bc0 3316 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3317
2e47b291
LC		 3318 if (tb[RTA_MARK])
3319 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3320
1da177e4
LT		 3321 if (iif) {
3322 struct net_device *dev;
72331bc0
SL		 3323 int flags = 0;
3324
5578689a 3325 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3326 if (!dev) {
3327 err = -ENODEV;
ab364a6f 3328 goto errout;
1da177e4 3329 }
72331bc0
SL		 3330
3331 fl6.flowi6_iif = iif;
3332
3333 if (!ipv6_addr_any(&fl6.saddr))
3334 flags |= RT6_LOOKUP_F_HAS_SADDR;
3335
3336 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3337 flags);
3338 } else {
3339 fl6.flowi6_oif = oif;
3340
ca254490
DA		 3341 if (netif_index_is_l3_master(net, oif)) {
3342 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3343 FLOWI_FLAG_SKIP_NH_OIF;
3344 }
3345
72331bc0 3346 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3347 }
3348
ab364a6f 3349 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3350 if (!skb) {
94e187c0 3351 ip6_rt_put(rt);
ab364a6f
TG		 3352 err = -ENOBUFS;
3353 goto errout;
3354 }
1da177e4 3355
ab364a6f
TG		 3356 /* Reserve room for dummy headers, this skb can pass
3357 through good chunk of routing engine.
3358 */
459a98ed 3359 skb_reset_mac_header(skb);
ab364a6f 3360 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3361
d8d1f30b 3362 skb_dst_set(skb, &rt->dst);
1da177e4 3363
4c9483b2 3364 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3365 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3366 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3367 if (err < 0) {
ab364a6f
TG		 3368 kfree_skb(skb);
3369 goto errout;
1da177e4
LT		 3370 }
3371
15e47304 3372 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3373errout:
1da177e4 3374 return err;
1da177e4
LT		 3375}
3376
37a1d361
RP		 3377void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3378 unsigned int nlm_flags)
1da177e4
LT		 3379{
3380 struct sk_buff *skb;
5578689a 3381 struct net *net = info->nl_net;
528c4ceb
DL		 3382 u32 seq;
3383 int err;
3384
3385 err = -ENOBUFS;
38308473 3386 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3387
19e42e45 3388 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3389 if (!skb)
21713ebc
TG		 3390 goto errout;
3391
191cd582 3392 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3393 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3394 if (err < 0) {
3395 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3396 WARN_ON(err == -EMSGSIZE);
3397 kfree_skb(skb);
3398 goto errout;
3399 }
15e47304 3400 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3401 info->nlh, gfp_any());
3402 return;
21713ebc
TG		 3403errout:
3404 if (err < 0)
5578689a 3405 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3406}
3407
8ed67789 3408static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3409 unsigned long event, void *ptr)
8ed67789 3410{
351638e7 3411 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3412 struct net *net = dev_net(dev);
8ed67789
DL		 3413
3414 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3415 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3416 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3417#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3418 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3419 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3420 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3421 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3422#endif
3423 }
3424
3425 return NOTIFY_OK;
3426}
3427
1da177e4
LT		 3428/*
3429 * /proc
3430 */
3431
3432#ifdef CONFIG_PROC_FS
3433
33120b30
AD		 3434static const struct file_operations ipv6_route_proc_fops = {
3435 .owner = THIS_MODULE,
3436 .open = ipv6_route_open,
3437 .read = seq_read,
3438 .llseek = seq_lseek,
8d2ca1d7 3439 .release = seq_release_net,
33120b30
AD		 3440};
3441
1da177e4
LT		 3442static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3443{
69ddb805 3444 struct net *net = (struct net *)seq->private;
1da177e4 3445 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3446 net->ipv6.rt6_stats->fib_nodes,
3447 net->ipv6.rt6_stats->fib_route_nodes,
3448 net->ipv6.rt6_stats->fib_rt_alloc,
3449 net->ipv6.rt6_stats->fib_rt_entries,
3450 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3451 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3452 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3453
3454 return 0;
3455}
3456
3457static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3458{
de05c557 3459 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3460}
3461
9a32144e 3462static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3463 .owner = THIS_MODULE,
3464 .open = rt6_stats_seq_open,
3465 .read = seq_read,
3466 .llseek = seq_lseek,
b6fcbdb4 3467 .release = single_release_net,
1da177e4
LT		 3468};
3469#endif /* CONFIG_PROC_FS */
3470
3471#ifdef CONFIG_SYSCTL
3472
1da177e4 3473static
fe2c6338 3474int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3475 void __user *buffer, size_t *lenp, loff_t *ppos)
3476{
c486da34
LAG		 3477 struct net *net;
3478 int delay;
3479 if (!write)
1da177e4 3480 return -EINVAL;
c486da34
LAG		 3481
3482 net = (struct net *)ctl->extra1;
3483 delay = net->ipv6.sysctl.flush_delay;
3484 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3485 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3486 return 0;
1da177e4
LT		 3487}
3488
fe2c6338 3489struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3490 {
1da177e4 3491 .procname = "flush",
4990509f 3492 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3493 .maxlen = sizeof(int),
89c8b3a1 3494 .mode = 0200,
6d9f239a 3495 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3496 },
3497 {
1da177e4 3498 .procname = "gc_thresh",
9a7ec3a9 3499 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3500 .maxlen = sizeof(int),
3501 .mode = 0644,
6d9f239a 3502 .proc_handler = proc_dointvec,
1da177e4
LT		 3503 },
3504 {
1da177e4 3505 .procname = "max_size",
4990509f 3506 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3507 .maxlen = sizeof(int),
3508 .mode = 0644,
6d9f239a 3509 .proc_handler = proc_dointvec,
1da177e4
LT		 3510 },
3511 {
1da177e4 3512 .procname = "gc_min_interval",
4990509f 3513 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3514 .maxlen = sizeof(int),
3515 .mode = 0644,
6d9f239a 3516 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3517 },
3518 {
1da177e4 3519 .procname = "gc_timeout",
4990509f 3520 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3521 .maxlen = sizeof(int),
3522 .mode = 0644,
6d9f239a 3523 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3524 },
3525 {
1da177e4 3526 .procname = "gc_interval",
4990509f 3527 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3528 .maxlen = sizeof(int),
3529 .mode = 0644,
6d9f239a 3530 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3531 },
3532 {
1da177e4 3533 .procname = "gc_elasticity",
4990509f 3534 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3535 .maxlen = sizeof(int),
3536 .mode = 0644,
f3d3f616 3537 .proc_handler = proc_dointvec,
1da177e4
LT		 3538 },
3539 {
1da177e4 3540 .procname = "mtu_expires",
4990509f 3541 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3542 .maxlen = sizeof(int),
3543 .mode = 0644,
6d9f239a 3544 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3545 },
3546 {
1da177e4 3547 .procname = "min_adv_mss",
4990509f 3548 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3549 .maxlen = sizeof(int),
3550 .mode = 0644,
f3d3f616 3551 .proc_handler = proc_dointvec,
1da177e4
LT		 3552 },
3553 {
1da177e4 3554 .procname = "gc_min_interval_ms",
4990509f 3555 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3556 .maxlen = sizeof(int),
3557 .mode = 0644,
6d9f239a 3558 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3559 },
f8572d8f 3560 { }
1da177e4
LT		 3561};
3562
2c8c1e72 3563struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3564{
3565 struct ctl_table *table;
3566
3567 table = kmemdup(ipv6_route_table_template,
3568 sizeof(ipv6_route_table_template),
3569 GFP_KERNEL);
5ee09105
YH		 3570
3571 if (table) {
3572 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3573 table[0].extra1 = net;
86393e52 3574 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3575 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3576 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3577 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3578 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3579 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3580 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3581 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3582 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3583
3584 /* Don't export sysctls to unprivileged users */
3585 if (net->user_ns != &init_user_ns)
3586 table[0].procname = NULL;
5ee09105
YH		 3587 }
3588
760f2d01
DL		 3589 return table;
3590}
1da177e4
LT		 3591#endif
3592
2c8c1e72 3593static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3594{
633d424b 3595 int ret = -ENOMEM;
8ed67789 3596
86393e52
AD		 3597 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3598 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3599
fc66f95c
ED		 3600 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3601 goto out_ip6_dst_ops;
3602
8ed67789
DL		 3603 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3604 sizeof(*net->ipv6.ip6_null_entry),
3605 GFP_KERNEL);
3606 if (!net->ipv6.ip6_null_entry)
fc66f95c 3607 goto out_ip6_dst_entries;
d8d1f30b 3608 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3609 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3610 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3611 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3612 ip6_template_metrics, true);
8ed67789
DL		 3613
3614#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3615 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3616 sizeof(*net->ipv6.ip6_prohibit_entry),
3617 GFP_KERNEL);
68fffc67
PZ		 3618 if (!net->ipv6.ip6_prohibit_entry)
3619 goto out_ip6_null_entry;
d8d1f30b 3620 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3621 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3622 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3623 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3624 ip6_template_metrics, true);
8ed67789
DL		 3625
3626 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3627 sizeof(*net->ipv6.ip6_blk_hole_entry),
3628 GFP_KERNEL);
68fffc67
PZ		 3629 if (!net->ipv6.ip6_blk_hole_entry)
3630 goto out_ip6_prohibit_entry;
d8d1f30b 3631 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3632 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3633 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3634 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3635 ip6_template_metrics, true);
8ed67789
DL		 3636#endif
3637
b339a47c
PZ		 3638 net->ipv6.sysctl.flush_delay = 0;
3639 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3640 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3641 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3642 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3643 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3644 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3645 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3646
6891a346
BT		 3647 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3648
8ed67789
DL		 3649 ret = 0;
3650out:
3651 return ret;
f2fc6a54 3652
68fffc67
PZ		 3653#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3654out_ip6_prohibit_entry:
3655 kfree(net->ipv6.ip6_prohibit_entry);
3656out_ip6_null_entry:
3657 kfree(net->ipv6.ip6_null_entry);
3658#endif
fc66f95c
ED		 3659out_ip6_dst_entries:
3660 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3661out_ip6_dst_ops:
f2fc6a54 3662 goto out;
cdb18761
DL		 3663}
3664
2c8c1e72 3665static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3666{
8ed67789
DL		 3667 kfree(net->ipv6.ip6_null_entry);
3668#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3669 kfree(net->ipv6.ip6_prohibit_entry);
3670 kfree(net->ipv6.ip6_blk_hole_entry);
3671#endif
41bb78b4 3672 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3673}
3674
d189634e
TG		 3675static int __net_init ip6_route_net_init_late(struct net *net)
3676{
3677#ifdef CONFIG_PROC_FS
d4beaa66
G		 3678 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3679 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3680#endif
3681 return 0;
3682}
3683
3684static void __net_exit ip6_route_net_exit_late(struct net *net)
3685{
3686#ifdef CONFIG_PROC_FS
ece31ffd
G		 3687 remove_proc_entry("ipv6_route", net->proc_net);
3688 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3689#endif
3690}
3691
cdb18761
DL		 3692static struct pernet_operations ip6_route_net_ops = {
3693 .init = ip6_route_net_init,
3694 .exit = ip6_route_net_exit,
3695};
3696
c3426b47
DM		 3697static int __net_init ipv6_inetpeer_init(struct net *net)
3698{
3699 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3700
3701 if (!bp)
3702 return -ENOMEM;
3703 inet_peer_base_init(bp);
3704 net->ipv6.peers = bp;
3705 return 0;
3706}
3707
3708static void __net_exit ipv6_inetpeer_exit(struct net *net)
3709{
3710 struct inet_peer_base *bp = net->ipv6.peers;
3711
3712 net->ipv6.peers = NULL;
56a6b248 3713 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3714 kfree(bp);
3715}
3716
2b823f72 3717static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3718 .init = ipv6_inetpeer_init,
3719 .exit = ipv6_inetpeer_exit,
3720};
3721
d189634e
TG		 3722static struct pernet_operations ip6_route_net_late_ops = {
3723 .init = ip6_route_net_init_late,
3724 .exit = ip6_route_net_exit_late,
3725};
3726
8ed67789
DL		 3727static struct notifier_block ip6_route_dev_notifier = {
3728 .notifier_call = ip6_route_dev_notify,
3729 .priority = 0,
3730};
3731
433d49c3 3732int __init ip6_route_init(void)
1da177e4 3733{
433d49c3 3734 int ret;
8d0b94af 3735 int cpu;
433d49c3 3736
9a7ec3a9
DL		 3737 ret = -ENOMEM;
3738 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3739 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3740 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3741 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3742 goto out;
14e50e57 3743
fc66f95c 3744 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3745 if (ret)
bdb3289f 3746 goto out_kmem_cache;
bdb3289f 3747
c3426b47
DM		 3748 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3749 if (ret)
e8803b6c 3750 goto out_dst_entries;
2a0c451a 3751
7e52b33b
DM		 3752 ret = register_pernet_subsys(&ip6_route_net_ops);
3753 if (ret)
3754 goto out_register_inetpeer;
c3426b47 3755
5dc121e9
AE		 3756 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3757
8ed67789
DL		 3758 /* Registering of the loopback is done before this portion of code,
3759 * the loopback reference in rt6_info will not be taken, do it
3760 * manually for init_net */
d8d1f30b 3761 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3762 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3763 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3764 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3765 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3766 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3767 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3768 #endif
e8803b6c 3769 ret = fib6_init();
433d49c3 3770 if (ret)
8ed67789 3771 goto out_register_subsys;
433d49c3 3772
433d49c3
DL		 3773 ret = xfrm6_init();
3774 if (ret)
e8803b6c 3775 goto out_fib6_init;
c35b7e72 3776
433d49c3
DL		 3777 ret = fib6_rules_init();
3778 if (ret)
3779 goto xfrm6_init;
7e5449c2 3780
d189634e
TG		 3781 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3782 if (ret)
3783 goto fib6_rules_init;
3784
433d49c3 3785 ret = -ENOBUFS;
c7ac8679
GR		 3786 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3787 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3788 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3789 goto out_register_late_subsys;
c127ea2c 3790
8ed67789 3791 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3792 if (ret)
d189634e 3793 goto out_register_late_subsys;
8ed67789 3794
8d0b94af
MKL		 3795 for_each_possible_cpu(cpu) {
3796 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3797
3798 INIT_LIST_HEAD(&ul->head);
3799 spin_lock_init(&ul->lock);
3800 }
3801
433d49c3
DL		 3802out:
3803 return ret;
3804
d189634e
TG		 3805out_register_late_subsys:
3806 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3807fib6_rules_init:
433d49c3
DL		 3808 fib6_rules_cleanup();
3809xfrm6_init:
433d49c3 3810 xfrm6_fini();
2a0c451a
TG		 3811out_fib6_init:
3812 fib6_gc_cleanup();
8ed67789
DL		 3813out_register_subsys:
3814 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3815out_register_inetpeer:
3816 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3817out_dst_entries:
3818 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3819out_kmem_cache:
f2fc6a54 3820 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3821 goto out;
1da177e4
LT		 3822}
3823
3824void ip6_route_cleanup(void)
3825{
8ed67789 3826 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3827 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3828 fib6_rules_cleanup();
1da177e4 3829 xfrm6_fini();
1da177e4 3830 fib6_gc_cleanup();
c3426b47 3831 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3832 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3833 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3834 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3835}
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