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[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 66
7c0f6ba6 67#include <linux/uaccess.h>
1da177e4
LT		 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 104 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 105 const struct in6_addr *gwaddr,
106 struct net_device *dev,
95c96174 107 unsigned int pref);
efa2cea0 108static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42 109 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 110 const struct in6_addr *gwaddr,
111 struct net_device *dev);
70ceb4f5
YH		 112#endif
113
8d0b94af
MKL		 114struct uncached_list {
115 spinlock_t lock;
116 struct list_head head;
117};
118
119static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
120
121static void rt6_uncached_list_add(struct rt6_info *rt)
122{
123 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
124
125 rt->dst.flags |= DST_NOCACHE;
126 rt->rt6i_uncached_list = ul;
127
128 spin_lock_bh(&ul->lock);
129 list_add_tail(&rt->rt6i_uncached, &ul->head);
130 spin_unlock_bh(&ul->lock);
131}
132
133static void rt6_uncached_list_del(struct rt6_info *rt)
134{
135 if (!list_empty(&rt->rt6i_uncached)) {
136 struct uncached_list *ul = rt->rt6i_uncached_list;
137
138 spin_lock_bh(&ul->lock);
139 list_del(&rt->rt6i_uncached);
140 spin_unlock_bh(&ul->lock);
141 }
142}
143
144static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
145{
146 struct net_device *loopback_dev = net->loopback_dev;
147 int cpu;
148
e332bc67
EB		 149 if (dev == loopback_dev)
150 return;
151
8d0b94af
MKL		 152 for_each_possible_cpu(cpu) {
153 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
154 struct rt6_info *rt;
155
156 spin_lock_bh(&ul->lock);
157 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
158 struct inet6_dev *rt_idev = rt->rt6i_idev;
159 struct net_device *rt_dev = rt->dst.dev;
160
e332bc67 161 if (rt_idev->dev == dev) {
8d0b94af
MKL		 162 rt->rt6i_idev = in6_dev_get(loopback_dev);
163 in6_dev_put(rt_idev);
164 }
165
e332bc67 166 if (rt_dev == dev) {
8d0b94af
MKL		 167 rt->dst.dev = loopback_dev;
168 dev_hold(rt->dst.dev);
169 dev_put(rt_dev);
170 }
171 }
172 spin_unlock_bh(&ul->lock);
173 }
174}
175
d52d3997
MKL		 176static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
177{
178 return dst_metrics_write_ptr(rt->dst.from);
179}
180
06582540
DM		 181static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
182{
4b32b5ad 183 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 184
d52d3997
MKL		 185 if (rt->rt6i_flags & RTF_PCPU)
186 return rt6_pcpu_cow_metrics(rt);
187 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 188 return NULL;
189 else
3b471175 190 return dst_cow_metrics_generic(dst, old);
06582540
DM		 191}
192
f894cbf8
DM		 193static inline const void *choose_neigh_daddr(struct rt6_info *rt,
194 struct sk_buff *skb,
195 const void *daddr)
39232973
DM		 196{
197 struct in6_addr *p = &rt->rt6i_gateway;
198
a7563f34 199 if (!ipv6_addr_any(p))
39232973 200 return (const void *) p;
f894cbf8
DM		 201 else if (skb)
202 return &ipv6_hdr(skb)->daddr;
39232973
DM		 203 return daddr;
204}
205
f894cbf8
DM		 206static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
207 struct sk_buff *skb,
208 const void *daddr)
d3aaeb38 209{
39232973
DM		 210 struct rt6_info *rt = (struct rt6_info *) dst;
211 struct neighbour *n;
212
f894cbf8 213 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 214 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 215 if (n)
216 return n;
217 return neigh_create(&nd_tbl, daddr, dst->dev);
218}
219
9a7ec3a9 220static struct dst_ops ip6_dst_ops_template = {
1da177e4 221 .family = AF_INET6,
1da177e4
LT		 222 .gc = ip6_dst_gc,
223 .gc_thresh = 1024,
224 .check = ip6_dst_check,
0dbaee3b 225 .default_advmss = ip6_default_advmss,
ebb762f2 226 .mtu = ip6_mtu,
06582540 227 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 228 .destroy = ip6_dst_destroy,
229 .ifdown = ip6_dst_ifdown,
230 .negative_advice = ip6_negative_advice,
231 .link_failure = ip6_link_failure,
232 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 233 .redirect = rt6_do_redirect,
9f8955cc 234 .local_out = __ip6_local_out,
d3aaeb38 235 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 236};
237
ebb762f2 238static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 239{
618f9bc7
SK		 240 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
241
242 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 243}
244
6700c270
DM		 245static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
246 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 247{
248}
249
6700c270
DM		 250static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
251 struct sk_buff *skb)
b587ee3b
DM		 252{
253}
254
14e50e57
DM		 255static struct dst_ops ip6_dst_blackhole_ops = {
256 .family = AF_INET6,
14e50e57
DM		 257 .destroy = ip6_dst_destroy,
258 .check = ip6_dst_check,
ebb762f2 259 .mtu = ip6_blackhole_mtu,
214f45c9 260 .default_advmss = ip6_default_advmss,
14e50e57 261 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 262 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 263 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 264 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 265};
266
62fa8a84 267static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 268 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 269};
270
fb0af4c7 271static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 272 .dst = {
273 .__refcnt = ATOMIC_INIT(1),
274 .__use = 1,
2c20cbd7 275 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 276 .error = -ENETUNREACH,
d8d1f30b
CG		 277 .input = ip6_pkt_discard,
278 .output = ip6_pkt_discard_out,
1da177e4
LT		 279 },
280 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 281 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 282 .rt6i_metric = ~(u32) 0,
283 .rt6i_ref = ATOMIC_INIT(1),
284};
285
101367c2
TG		 286#ifdef CONFIG_IPV6_MULTIPLE_TABLES
287
fb0af4c7 288static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 289 .dst = {
290 .__refcnt = ATOMIC_INIT(1),
291 .__use = 1,
2c20cbd7 292 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 293 .error = -EACCES,
d8d1f30b
CG		 294 .input = ip6_pkt_prohibit,
295 .output = ip6_pkt_prohibit_out,
101367c2
TG		 296 },
297 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 298 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 299 .rt6i_metric = ~(u32) 0,
300 .rt6i_ref = ATOMIC_INIT(1),
301};
302
fb0af4c7 303static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 304 .dst = {
305 .__refcnt = ATOMIC_INIT(1),
306 .__use = 1,
2c20cbd7 307 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 308 .error = -EINVAL,
d8d1f30b 309 .input = dst_discard,
ede2059d 310 .output = dst_discard_out,
101367c2
TG		 311 },
312 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 313 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 314 .rt6i_metric = ~(u32) 0,
315 .rt6i_ref = ATOMIC_INIT(1),
316};
317
318#endif
319
ebfa45f0
MKL		 320static void rt6_info_init(struct rt6_info *rt)
321{
322 struct dst_entry *dst = &rt->dst;
323
324 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
325 INIT_LIST_HEAD(&rt->rt6i_siblings);
326 INIT_LIST_HEAD(&rt->rt6i_uncached);
327}
328
1da177e4 329/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 330static struct rt6_info *__ip6_dst_alloc(struct net *net,
331 struct net_device *dev,
ad706862 332 int flags)
1da177e4 333{
97bab73f 334 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 335 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 336
ebfa45f0
MKL		 337 if (rt)
338 rt6_info_init(rt);
8104891b 339
cf911662 340 return rt;
1da177e4
LT		 341}
342
9ab179d8
DA		 343struct rt6_info *ip6_dst_alloc(struct net *net,
344 struct net_device *dev,
345 int flags)
d52d3997 346{
ad706862 347 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 348
349 if (rt) {
350 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
351 if (rt->rt6i_pcpu) {
352 int cpu;
353
354 for_each_possible_cpu(cpu) {
355 struct rt6_info **p;
356
357 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
358 /* no one shares rt */
359 *p = NULL;
360 }
361 } else {
362 dst_destroy((struct dst_entry *)rt);
363 return NULL;
364 }
365 }
366
367 return rt;
368}
9ab179d8 369EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 370
1da177e4
LT		 371static void ip6_dst_destroy(struct dst_entry *dst)
372{
373 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 374 struct dst_entry *from = dst->from;
8d0b94af 375 struct inet6_dev *idev;
1da177e4 376
4b32b5ad 377 dst_destroy_metrics_generic(dst);
87775312 378 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 379 rt6_uncached_list_del(rt);
380
381 idev = rt->rt6i_idev;
38308473 382 if (idev) {
1da177e4
LT		 383 rt->rt6i_idev = NULL;
384 in6_dev_put(idev);
1ab1457c 385 }
1716a961 386
ecd98837
YH		 387 dst->from = NULL;
388 dst_release(from);
b3419363
DM		 389}
390
1da177e4
LT		 391static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
392 int how)
393{
394 struct rt6_info *rt = (struct rt6_info *)dst;
395 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 396 struct net_device *loopback_dev =
c346dca1 397 dev_net(dev)->loopback_dev;
1da177e4 398
97cac082
DM		 399 if (dev != loopback_dev) {
400 if (idev && idev->dev == dev) {
401 struct inet6_dev *loopback_idev =
402 in6_dev_get(loopback_dev);
403 if (loopback_idev) {
404 rt->rt6i_idev = loopback_idev;
405 in6_dev_put(idev);
406 }
407 }
1da177e4
LT		 408 }
409}
410
5973fb1e
MKL		 411static bool __rt6_check_expired(const struct rt6_info *rt)
412{
413 if (rt->rt6i_flags & RTF_EXPIRES)
414 return time_after(jiffies, rt->dst.expires);
415 else
416 return false;
417}
418
a50feda5 419static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 420{
1716a961
G		 421 if (rt->rt6i_flags & RTF_EXPIRES) {
422 if (time_after(jiffies, rt->dst.expires))
a50feda5 423 return true;
1716a961 424 } else if (rt->dst.from) {
3fd91fb3 425 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 426 }
a50feda5 427 return false;
1da177e4
LT		 428}
429
51ebd318
ND		 430/* Multipath route selection:
431 * Hash based function using packet header and flowlabel.
432 * Adapted from fib_info_hashfn()
433 */
434static int rt6_info_hash_nhsfn(unsigned int candidate_count,
435 const struct flowi6 *fl6)
436{
644d0e65 437 return get_hash_from_flowi6(fl6) % candidate_count;
51ebd318
ND		 438}
439
440static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 441 struct flowi6 *fl6, int oif,
442 int strict)
51ebd318
ND		 443{
444 struct rt6_info *sibling, *next_sibling;
445 int route_choosen;
446
447 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
448 /* Don't change the route, if route_choosen == 0
449 * (siblings does not include ourself)
450 */
451 if (route_choosen)
452 list_for_each_entry_safe(sibling, next_sibling,
453 &match->rt6i_siblings, rt6i_siblings) {
454 route_choosen--;
455 if (route_choosen == 0) {
52bd4c0c
ND		 456 if (rt6_score_route(sibling, oif, strict) < 0)
457 break;
51ebd318
ND		 458 match = sibling;
459 break;
460 }
461 }
462 return match;
463}
464
1da177e4 465/*
c71099ac 466 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 467 */
468
8ed67789
DL		 469static inline struct rt6_info *rt6_device_match(struct net *net,
470 struct rt6_info *rt,
b71d1d42 471 const struct in6_addr *saddr,
1da177e4 472 int oif,
d420895e 473 int flags)
1da177e4
LT		 474{
475 struct rt6_info *local = NULL;
476 struct rt6_info *sprt;
477
dd3abc4e
YH		 478 if (!oif && ipv6_addr_any(saddr))
479 goto out;
480
d8d1f30b 481 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 482 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 483
484 if (oif) {
1da177e4
LT		 485 if (dev->ifindex == oif)
486 return sprt;
487 if (dev->flags & IFF_LOOPBACK) {
38308473 488 if (!sprt->rt6i_idev ||
1da177e4 489 sprt->rt6i_idev->dev->ifindex != oif) {
17fb0b2b 490 if (flags & RT6_LOOKUP_F_IFACE)
1da177e4 491 continue;
17fb0b2b
DA		 492 if (local &&
493 local->rt6i_idev->dev->ifindex == oif)
1da177e4
LT		 494 continue;
495 }
496 local = sprt;
497 }
dd3abc4e
YH		 498 } else {
499 if (ipv6_chk_addr(net, saddr, dev,
500 flags & RT6_LOOKUP_F_IFACE))
501 return sprt;
1da177e4 502 }
dd3abc4e 503 }
1da177e4 504
dd3abc4e 505 if (oif) {
1da177e4
LT		 506 if (local)
507 return local;
508
d420895e 509 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 510 return net->ipv6.ip6_null_entry;
1da177e4 511 }
dd3abc4e 512out:
1da177e4
LT		 513 return rt;
514}
515
27097255 516#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 517struct __rt6_probe_work {
518 struct work_struct work;
519 struct in6_addr target;
520 struct net_device *dev;
521};
522
523static void rt6_probe_deferred(struct work_struct *w)
524{
525 struct in6_addr mcaddr;
526 struct __rt6_probe_work *work =
527 container_of(w, struct __rt6_probe_work, work);
528
529 addrconf_addr_solict_mult(&work->target, &mcaddr);
adc176c5 530 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
c2f17e82 531 dev_put(work->dev);
662f5533 532 kfree(work);
c2f17e82
HFS		 533}
534
27097255
YH		 535static void rt6_probe(struct rt6_info *rt)
536{
990edb42 537 struct __rt6_probe_work *work;
f2c31e32 538 struct neighbour *neigh;
27097255
YH		 539 /*
540 * Okay, this does not seem to be appropriate
541 * for now, however, we need to check if it
542 * is really so; aka Router Reachability Probing.
543 *
544 * Router Reachability Probe MUST be rate-limited
545 * to no more than one per minute.
546 */
2152caea 547 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 548 return;
2152caea
YH		 549 rcu_read_lock_bh();
550 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
551 if (neigh) {
8d6c31bf
MKL		 552 if (neigh->nud_state & NUD_VALID)
553 goto out;
554
990edb42 555 work = NULL;
2152caea 556 write_lock(&neigh->lock);
990edb42
MKL		 557 if (!(neigh->nud_state & NUD_VALID) &&
558 time_after(jiffies,
559 neigh->updated +
560 rt->rt6i_idev->cnf.rtr_probe_interval)) {
561 work = kmalloc(sizeof(*work), GFP_ATOMIC);
562 if (work)
563 __neigh_set_probe_once(neigh);
c2f17e82 564 }
2152caea 565 write_unlock(&neigh->lock);
990edb42
MKL		 566 } else {
567 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 568 }
990edb42
MKL		 569
570 if (work) {
571 INIT_WORK(&work->work, rt6_probe_deferred);
572 work->target = rt->rt6i_gateway;
573 dev_hold(rt->dst.dev);
574 work->dev = rt->dst.dev;
575 schedule_work(&work->work);
576 }
577
8d6c31bf 578out:
2152caea 579 rcu_read_unlock_bh();
27097255
YH		 580}
581#else
582static inline void rt6_probe(struct rt6_info *rt)
583{
27097255
YH		 584}
585#endif
586
1da177e4 587/*
554cfb7e 588 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 589 */
b6f99a21 590static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 591{
d1918542 592 struct net_device *dev = rt->dst.dev;
161980f4 593 if (!oif || dev->ifindex == oif)
554cfb7e 594 return 2;
161980f4
DM		 595 if ((dev->flags & IFF_LOOPBACK) &&
596 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
597 return 1;
598 return 0;
554cfb7e 599}
1da177e4 600
afc154e9 601static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 602{
f2c31e32 603 struct neighbour *neigh;
afc154e9 604 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 605
4d0c5911
YH		 606 if (rt->rt6i_flags & RTF_NONEXTHOP ||
607 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 608 return RT6_NUD_SUCCEED;
145a3621
YH		 609
610 rcu_read_lock_bh();
611 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
612 if (neigh) {
613 read_lock(&neigh->lock);
554cfb7e 614 if (neigh->nud_state & NUD_VALID)
afc154e9 615 ret = RT6_NUD_SUCCEED;
398bcbeb 616#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 617 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 618 ret = RT6_NUD_SUCCEED;
7e980569
JB		 619 else
620 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 621#endif
145a3621 622 read_unlock(&neigh->lock);
afc154e9
HFS		 623 } else {
624 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 625 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 626 }
145a3621
YH		 627 rcu_read_unlock_bh();
628
a5a81f0b 629 return ret;
1da177e4
LT		 630}
631
554cfb7e
YH		 632static int rt6_score_route(struct rt6_info *rt, int oif,
633 int strict)
1da177e4 634{
a5a81f0b 635 int m;
1ab1457c 636
4d0c5911 637 m = rt6_check_dev(rt, oif);
77d16f45 638 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 639 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 640#ifdef CONFIG_IPV6_ROUTER_PREF
641 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
642#endif
afc154e9
HFS		 643 if (strict & RT6_LOOKUP_F_REACHABLE) {
644 int n = rt6_check_neigh(rt);
645 if (n < 0)
646 return n;
647 }
554cfb7e
YH		 648 return m;
649}
650
f11e6659 651static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 652 int *mpri, struct rt6_info *match,
653 bool *do_rr)
554cfb7e 654{
f11e6659 655 int m;
afc154e9 656 bool match_do_rr = false;
35103d11
AG		 657 struct inet6_dev *idev = rt->rt6i_idev;
658 struct net_device *dev = rt->dst.dev;
659
660 if (dev && !netif_carrier_ok(dev) &&
d5d32e4b
DA		 661 idev->cnf.ignore_routes_with_linkdown &&
662 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
35103d11 663 goto out;
f11e6659
DM		 664
665 if (rt6_check_expired(rt))
666 goto out;
667
668 m = rt6_score_route(rt, oif, strict);
7e980569 669 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 670 match_do_rr = true;
671 m = 0; /* lowest valid score */
7e980569 672 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 673 goto out;
afc154e9
HFS		 674 }
675
676 if (strict & RT6_LOOKUP_F_REACHABLE)
677 rt6_probe(rt);
f11e6659 678
7e980569 679 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 680 if (m > *mpri) {
afc154e9 681 *do_rr = match_do_rr;
f11e6659
DM		 682 *mpri = m;
683 match = rt;
f11e6659 684 }
f11e6659
DM		 685out:
686 return match;
687}
688
689static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
690 struct rt6_info *rr_head,
afc154e9
HFS		 691 u32 metric, int oif, int strict,
692 bool *do_rr)
f11e6659 693{
9fbdcfaf 694 struct rt6_info *rt, *match, *cont;
554cfb7e 695 int mpri = -1;
1da177e4 696
f11e6659 697 match = NULL;
9fbdcfaf
SK		 698 cont = NULL;
699 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
700 if (rt->rt6i_metric != metric) {
701 cont = rt;
702 break;
703 }
704
705 match = find_match(rt, oif, strict, &mpri, match, do_rr);
706 }
707
708 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
709 if (rt->rt6i_metric != metric) {
710 cont = rt;
711 break;
712 }
713
afc154e9 714 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 715 }
716
717 if (match || !cont)
718 return match;
719
720 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 721 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 722
f11e6659
DM		 723 return match;
724}
1da177e4 725
f11e6659
DM		 726static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
727{
728 struct rt6_info *match, *rt0;
8ed67789 729 struct net *net;
afc154e9 730 bool do_rr = false;
1da177e4 731
f11e6659
DM		 732 rt0 = fn->rr_ptr;
733 if (!rt0)
734 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 735
afc154e9
HFS		 736 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
737 &do_rr);
1da177e4 738
afc154e9 739 if (do_rr) {
d8d1f30b 740 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 741
554cfb7e 742 /* no entries matched; do round-robin */
f11e6659
DM		 743 if (!next || next->rt6i_metric != rt0->rt6i_metric)
744 next = fn->leaf;
745
746 if (next != rt0)
747 fn->rr_ptr = next;
1da177e4 748 }
1da177e4 749
d1918542 750 net = dev_net(rt0->dst.dev);
a02cec21 751 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 752}
753
8b9df265
MKL		 754static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
755{
756 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
757}
758
70ceb4f5
YH		 759#ifdef CONFIG_IPV6_ROUTE_INFO
760int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 761 const struct in6_addr *gwaddr)
70ceb4f5 762{
c346dca1 763 struct net *net = dev_net(dev);
70ceb4f5
YH		 764 struct route_info *rinfo = (struct route_info *) opt;
765 struct in6_addr prefix_buf, *prefix;
766 unsigned int pref;
4bed72e4 767 unsigned long lifetime;
70ceb4f5
YH		 768 struct rt6_info *rt;
769
770 if (len < sizeof(struct route_info)) {
771 return -EINVAL;
772 }
773
774 /* Sanity check for prefix_len and length */
775 if (rinfo->length > 3) {
776 return -EINVAL;
777 } else if (rinfo->prefix_len > 128) {
778 return -EINVAL;
779 } else if (rinfo->prefix_len > 64) {
780 if (rinfo->length < 2) {
781 return -EINVAL;
782 }
783 } else if (rinfo->prefix_len > 0) {
784 if (rinfo->length < 1) {
785 return -EINVAL;
786 }
787 }
788
789 pref = rinfo->route_pref;
790 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 791 return -EINVAL;
70ceb4f5 792
4bed72e4 793 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 794
795 if (rinfo->length == 3)
796 prefix = (struct in6_addr *)rinfo->prefix;
797 else {
798 /* this function is safe */
799 ipv6_addr_prefix(&prefix_buf,
800 (struct in6_addr *)rinfo->prefix,
801 rinfo->prefix_len);
802 prefix = &prefix_buf;
803 }
804
f104a567
DJ		 805 if (rinfo->prefix_len == 0)
806 rt = rt6_get_dflt_router(gwaddr, dev);
807 else
808 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
830218c1 809 gwaddr, dev);
70ceb4f5
YH		 810
811 if (rt && !lifetime) {
e0a1ad73 812 ip6_del_rt(rt);
70ceb4f5
YH		 813 rt = NULL;
814 }
815
816 if (!rt && lifetime)
830218c1
DA		 817 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
818 dev, pref);
70ceb4f5
YH		 819 else if (rt)
820 rt->rt6i_flags = RTF_ROUTEINFO |
821 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
822
823 if (rt) {
1716a961
G		 824 if (!addrconf_finite_timeout(lifetime))
825 rt6_clean_expires(rt);
826 else
827 rt6_set_expires(rt, jiffies + HZ * lifetime);
828
94e187c0 829 ip6_rt_put(rt);
70ceb4f5
YH		 830 }
831 return 0;
832}
833#endif
834
a3c00e46
MKL		 835static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
836 struct in6_addr *saddr)
837{
838 struct fib6_node *pn;
839 while (1) {
840 if (fn->fn_flags & RTN_TL_ROOT)
841 return NULL;
842 pn = fn->parent;
843 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
844 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
845 else
846 fn = pn;
847 if (fn->fn_flags & RTN_RTINFO)
848 return fn;
849 }
850}
c71099ac 851
8ed67789
DL		 852static struct rt6_info *ip6_pol_route_lookup(struct net *net,
853 struct fib6_table *table,
4c9483b2 854 struct flowi6 *fl6, int flags)
1da177e4
LT		 855{
856 struct fib6_node *fn;
857 struct rt6_info *rt;
858
c71099ac 859 read_lock_bh(&table->tb6_lock);
4c9483b2 860 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 861restart:
862 rt = fn->leaf;
4c9483b2 863 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 864 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 865 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 866 if (rt == net->ipv6.ip6_null_entry) {
867 fn = fib6_backtrack(fn, &fl6->saddr);
868 if (fn)
869 goto restart;
870 }
d8d1f30b 871 dst_use(&rt->dst, jiffies);
c71099ac 872 read_unlock_bh(&table->tb6_lock);
b811580d
DA		 873
874 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
875
c71099ac
TG		 876 return rt;
877
878}
879
67ba4152 880struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 881 int flags)
882{
883 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
884}
885EXPORT_SYMBOL_GPL(ip6_route_lookup);
886
9acd9f3a
YH		 887struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
888 const struct in6_addr *saddr, int oif, int strict)
c71099ac 889{
4c9483b2
DM		 890 struct flowi6 fl6 = {
891 .flowi6_oif = oif,
892 .daddr = *daddr,
c71099ac
TG		 893 };
894 struct dst_entry *dst;
77d16f45 895 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 896
adaa70bb 897 if (saddr) {
4c9483b2 898 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 899 flags |= RT6_LOOKUP_F_HAS_SADDR;
900 }
901
4c9483b2 902 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 903 if (dst->error == 0)
904 return (struct rt6_info *) dst;
905
906 dst_release(dst);
907
1da177e4
LT		 908 return NULL;
909}
7159039a
YH		 910EXPORT_SYMBOL(rt6_lookup);
911
c71099ac 912/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 913 It takes new route entry, the addition fails by any reason the
914 route is freed. In any case, if caller does not hold it, it may
915 be destroyed.
916 */
917
e5fd387a 918static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 919 struct mx6_config *mxc)
1da177e4
LT		 920{
921 int err;
c71099ac 922 struct fib6_table *table;
1da177e4 923
c71099ac
TG		 924 table = rt->rt6i_table;
925 write_lock_bh(&table->tb6_lock);
e715b6d3 926 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 927 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 928
929 return err;
930}
931
40e22e8f
TG		 932int ip6_ins_rt(struct rt6_info *rt)
933{
e715b6d3
FW		 934 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
935 struct mx6_config mxc = { .mx = NULL, };
936
937 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 938}
939
8b9df265
MKL		 940static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
941 const struct in6_addr *daddr,
942 const struct in6_addr *saddr)
1da177e4 943{
1da177e4
LT		 944 struct rt6_info *rt;
945
946 /*
947 * Clone the route.
948 */
949
d52d3997 950 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 951 ort = (struct rt6_info *)ort->dst.from;
1da177e4 952
ad706862 953 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 954
955 if (!rt)
956 return NULL;
957
958 ip6_rt_copy_init(rt, ort);
959 rt->rt6i_flags |= RTF_CACHE;
960 rt->rt6i_metric = 0;
961 rt->dst.flags |= DST_HOST;
962 rt->rt6i_dst.addr = *daddr;
963 rt->rt6i_dst.plen = 128;
1da177e4 964
83a09abd
MKL		 965 if (!rt6_is_gw_or_nonexthop(ort)) {
966 if (ort->rt6i_dst.plen != 128 &&
967 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
968 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 969#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 970 if (rt->rt6i_src.plen && saddr) {
971 rt->rt6i_src.addr = *saddr;
972 rt->rt6i_src.plen = 128;
8b9df265 973 }
83a09abd 974#endif
95a9a5ba 975 }
1da177e4 976
95a9a5ba
YH		 977 return rt;
978}
1da177e4 979
d52d3997
MKL		 980static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
981{
982 struct rt6_info *pcpu_rt;
983
984 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 985 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 986
987 if (!pcpu_rt)
988 return NULL;
989 ip6_rt_copy_init(pcpu_rt, rt);
990 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
991 pcpu_rt->rt6i_flags |= RTF_PCPU;
992 return pcpu_rt;
993}
994
995/* It should be called with read_lock_bh(&tb6_lock) acquired */
996static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
997{
a73e4195 998 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 999
1000 p = this_cpu_ptr(rt->rt6i_pcpu);
1001 pcpu_rt = *p;
1002
a73e4195
MKL		 1003 if (pcpu_rt) {
1004 dst_hold(&pcpu_rt->dst);
1005 rt6_dst_from_metrics_check(pcpu_rt);
1006 }
1007 return pcpu_rt;
1008}
1009
1010static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1011{
9c7370a1 1012 struct fib6_table *table = rt->rt6i_table;
a73e4195 1013 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1014
1015 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1016 if (!pcpu_rt) {
1017 struct net *net = dev_net(rt->dst.dev);
1018
9c7370a1
MKL		 1019 dst_hold(&net->ipv6.ip6_null_entry->dst);
1020 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1021 }
1022
9c7370a1
MKL		 1023 read_lock_bh(&table->tb6_lock);
1024 if (rt->rt6i_pcpu) {
1025 p = this_cpu_ptr(rt->rt6i_pcpu);
1026 prev = cmpxchg(p, NULL, pcpu_rt);
1027 if (prev) {
1028 /* If someone did it before us, return prev instead */
1029 dst_destroy(&pcpu_rt->dst);
1030 pcpu_rt = prev;
1031 }
1032 } else {
1033 /* rt has been removed from the fib6 tree
1034 * before we have a chance to acquire the read_lock.
1035 * In this case, don't brother to create a pcpu rt
1036 * since rt is going away anyway. The next
1037 * dst_check() will trigger a re-lookup.
1038 */
d52d3997 1039 dst_destroy(&pcpu_rt->dst);
9c7370a1 1040 pcpu_rt = rt;
d52d3997 1041 }
d52d3997
MKL		 1042 dst_hold(&pcpu_rt->dst);
1043 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1044 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1045 return pcpu_rt;
1046}
1047
9ff74384
DA		 1048struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1049 int oif, struct flowi6 *fl6, int flags)
1da177e4 1050{
367efcb9 1051 struct fib6_node *fn, *saved_fn;
45e4fd26 1052 struct rt6_info *rt;
c71099ac 1053 int strict = 0;
1da177e4 1054
77d16f45 1055 strict |= flags & RT6_LOOKUP_F_IFACE;
d5d32e4b 1056 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
367efcb9
MKL		 1057 if (net->ipv6.devconf_all->forwarding == 0)
1058 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1059
c71099ac 1060 read_lock_bh(&table->tb6_lock);
1da177e4 1061
4c9483b2 1062 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1063 saved_fn = fn;
1da177e4 1064
ca254490
DA		 1065 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1066 oif = 0;
1067
a3c00e46 1068redo_rt6_select:
367efcb9 1069 rt = rt6_select(fn, oif, strict);
52bd4c0c 1070 if (rt->rt6i_nsiblings)
367efcb9 1071 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1072 if (rt == net->ipv6.ip6_null_entry) {
1073 fn = fib6_backtrack(fn, &fl6->saddr);
1074 if (fn)
1075 goto redo_rt6_select;
367efcb9
MKL		 1076 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1077 /* also consider unreachable route */
1078 strict &= ~RT6_LOOKUP_F_REACHABLE;
1079 fn = saved_fn;
1080 goto redo_rt6_select;
367efcb9 1081 }
a3c00e46
MKL		 1082 }
1083
fb9de91e 1084
3da59bd9 1085 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1086 dst_use(&rt->dst, jiffies);
1087 read_unlock_bh(&table->tb6_lock);
1088
1089 rt6_dst_from_metrics_check(rt);
b811580d
DA		 1090
1091 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
d52d3997 1092 return rt;
3da59bd9
MKL		 1093 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1094 !(rt->rt6i_flags & RTF_GATEWAY))) {
1095 /* Create a RTF_CACHE clone which will not be
1096 * owned by the fib6 tree. It is for the special case where
1097 * the daddr in the skb during the neighbor look-up is different
1098 * from the fl6->daddr used to look-up route here.
1099 */
1100
1101 struct rt6_info *uncached_rt;
1102
d52d3997
MKL		 1103 dst_use(&rt->dst, jiffies);
1104 read_unlock_bh(&table->tb6_lock);
1105
3da59bd9
MKL		 1106 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1107 dst_release(&rt->dst);
c71099ac 1108
3da59bd9 1109 if (uncached_rt)
8d0b94af 1110 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1111 else
1112 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1113
3da59bd9 1114 dst_hold(&uncached_rt->dst);
b811580d
DA		 1115
1116 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
3da59bd9 1117 return uncached_rt;
3da59bd9 1118
d52d3997
MKL		 1119 } else {
1120 /* Get a percpu copy */
1121
1122 struct rt6_info *pcpu_rt;
1123
1124 rt->dst.lastuse = jiffies;
1125 rt->dst.__use++;
1126 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1127
9c7370a1
MKL		 1128 if (pcpu_rt) {
1129 read_unlock_bh(&table->tb6_lock);
1130 } else {
1131 /* We have to do the read_unlock first
1132 * because rt6_make_pcpu_route() may trigger
1133 * ip6_dst_gc() which will take the write_lock.
1134 */
1135 dst_hold(&rt->dst);
1136 read_unlock_bh(&table->tb6_lock);
a73e4195 1137 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1138 dst_release(&rt->dst);
1139 }
d52d3997 1140
b811580d 1141 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
d52d3997 1142 return pcpu_rt;
9c7370a1 1143
d52d3997 1144 }
1da177e4 1145}
9ff74384 1146EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 1147
8ed67789 1148static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1149 struct flowi6 *fl6, int flags)
4acad72d 1150{
4c9483b2 1151 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1152}
1153
d409b847
MB		 1154struct dst_entry *ip6_route_input_lookup(struct net *net,
1155 struct net_device *dev,
1156 struct flowi6 *fl6, int flags)
72331bc0
SL		 1157{
1158 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1159 flags |= RT6_LOOKUP_F_IFACE;
1160
1161 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1162}
d409b847 1163EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
72331bc0 1164
c71099ac
TG		 1165void ip6_route_input(struct sk_buff *skb)
1166{
b71d1d42 1167 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1168 struct net *net = dev_net(skb->dev);
adaa70bb 1169 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1170 struct ip_tunnel_info *tun_info;
4c9483b2 1171 struct flowi6 fl6 = {
e0d56fdd 1172 .flowi6_iif = skb->dev->ifindex,
4c9483b2
DM		 1173 .daddr = iph->daddr,
1174 .saddr = iph->saddr,
6502ca52 1175 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1176 .flowi6_mark = skb->mark,
1177 .flowi6_proto = iph->nexthdr,
c71099ac 1178 };
adaa70bb 1179
904af04d 1180 tun_info = skb_tunnel_info(skb);
46fa062a 1181 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1182 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1183 skb_dst_drop(skb);
72331bc0 1184 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1185}
1186
8ed67789 1187static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1188 struct flowi6 *fl6, int flags)
1da177e4 1189{
4c9483b2 1190 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1191}
1192
6f21c96a
PA		 1193struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1194 struct flowi6 *fl6, int flags)
c71099ac 1195{
d46a9d67 1196 bool any_src;
c71099ac 1197
4c1feac5
DA		 1198 if (rt6_need_strict(&fl6->daddr)) {
1199 struct dst_entry *dst;
1200
1201 dst = l3mdev_link_scope_lookup(net, fl6);
1202 if (dst)
1203 return dst;
1204 }
ca254490 1205
1fb9489b 1206 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1207
d46a9d67 1208 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1209 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1210 (fl6->flowi6_oif && any_src))
77d16f45 1211 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1212
d46a9d67 1213 if (!any_src)
adaa70bb 1214 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1215 else if (sk)
1216 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1217
4c9483b2 1218 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1219}
6f21c96a 1220EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 1221
2774c131 1222struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1223{
5c1e6aa3 1224 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1225 struct dst_entry *new = NULL;
1226
f5b0a874 1227 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1228 if (rt) {
0a1f5962 1229 rt6_info_init(rt);
8104891b 1230
0a1f5962 1231 new = &rt->dst;
14e50e57 1232 new->__use = 1;
352e512c 1233 new->input = dst_discard;
ede2059d 1234 new->output = dst_discard_out;
14e50e57 1235
0a1f5962 1236 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1237 rt->rt6i_idev = ort->rt6i_idev;
1238 if (rt->rt6i_idev)
1239 in6_dev_hold(rt->rt6i_idev);
14e50e57 1240
4e3fd7a0 1241 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1242 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1243 rt->rt6i_metric = 0;
1244
1245 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1246#ifdef CONFIG_IPV6_SUBTREES
1247 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1248#endif
1249
1250 dst_free(new);
1251 }
1252
69ead7af
DM		 1253 dst_release(dst_orig);
1254 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1255}
14e50e57 1256
1da177e4
LT		 1257/*
1258 * Destination cache support functions
1259 */
1260
4b32b5ad
MKL		 1261static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1262{
1263 if (rt->dst.from &&
1264 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1265 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1266}
1267
3da59bd9
MKL		 1268static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1269{
1270 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1271 return NULL;
1272
1273 if (rt6_check_expired(rt))
1274 return NULL;
1275
1276 return &rt->dst;
1277}
1278
1279static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1280{
5973fb1e
MKL		 1281 if (!__rt6_check_expired(rt) &&
1282 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
3da59bd9
MKL		 1283 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1284 return &rt->dst;
1285 else
1286 return NULL;
1287}
1288
1da177e4
LT		 1289static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1290{
1291 struct rt6_info *rt;
1292
1293 rt = (struct rt6_info *) dst;
1294
6f3118b5
ND		 1295 /* All IPV6 dsts are created with ->obsolete set to the value
1296 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1297 * into this function always.
1298 */
e3bc10bd 1299
4b32b5ad
MKL		 1300 rt6_dst_from_metrics_check(rt);
1301
02bcf4e0
MKL		 1302 if (rt->rt6i_flags & RTF_PCPU ||
1303 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
3da59bd9
MKL		 1304 return rt6_dst_from_check(rt, cookie);
1305 else
1306 return rt6_check(rt, cookie);
1da177e4
LT		 1307}
1308
1309static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1310{
1311 struct rt6_info *rt = (struct rt6_info *) dst;
1312
1313 if (rt) {
54c1a859
YH		 1314 if (rt->rt6i_flags & RTF_CACHE) {
1315 if (rt6_check_expired(rt)) {
1316 ip6_del_rt(rt);
1317 dst = NULL;
1318 }
1319 } else {
1da177e4 1320 dst_release(dst);
54c1a859
YH		 1321 dst = NULL;
1322 }
1da177e4 1323 }
54c1a859 1324 return dst;
1da177e4
LT		 1325}
1326
1327static void ip6_link_failure(struct sk_buff *skb)
1328{
1329 struct rt6_info *rt;
1330
3ffe533c 1331 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1332
adf30907 1333 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1334 if (rt) {
1eb4f758
HFS		 1335 if (rt->rt6i_flags & RTF_CACHE) {
1336 dst_hold(&rt->dst);
8e3d5be7 1337 ip6_del_rt(rt);
1eb4f758 1338 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1339 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1340 }
1da177e4
LT		 1341 }
1342}
1343
45e4fd26
MKL		 1344static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1345{
1346 struct net *net = dev_net(rt->dst.dev);
1347
1348 rt->rt6i_flags |= RTF_MODIFIED;
1349 rt->rt6i_pmtu = mtu;
1350 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1351}
1352
0d3f6d29
MKL		 1353static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1354{
1355 return !(rt->rt6i_flags & RTF_CACHE) &&
1356 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1357}
1358
45e4fd26
MKL		 1359static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1360 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1361{
67ba4152 1362 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1363
45e4fd26
MKL		 1364 if (rt6->rt6i_flags & RTF_LOCAL)
1365 return;
81aded24 1366
19bda36c
XL		 1367 if (dst_metric_locked(dst, RTAX_MTU))
1368 return;
1369
45e4fd26
MKL		 1370 dst_confirm(dst);
1371 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1372 if (mtu >= dst_mtu(dst))
1373 return;
9d289715 1374
0d3f6d29 1375 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26
MKL		 1376 rt6_do_update_pmtu(rt6, mtu);
1377 } else {
1378 const struct in6_addr *daddr, *saddr;
1379 struct rt6_info *nrt6;
1380
1381 if (iph) {
1382 daddr = &iph->daddr;
1383 saddr = &iph->saddr;
1384 } else if (sk) {
1385 daddr = &sk->sk_v6_daddr;
1386 saddr = &inet6_sk(sk)->saddr;
1387 } else {
1388 return;
1389 }
1390 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1391 if (nrt6) {
1392 rt6_do_update_pmtu(nrt6, mtu);
1393
1394 /* ip6_ins_rt(nrt6) will bump the
1395 * rt6->rt6i_node->fn_sernum
1396 * which will fail the next rt6_check() and
1397 * invalidate the sk->sk_dst_cache.
1398 */
1399 ip6_ins_rt(nrt6);
1400 }
1da177e4
LT		 1401 }
1402}
1403
45e4fd26
MKL		 1404static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1405 struct sk_buff *skb, u32 mtu)
1406{
1407 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1408}
1409
42ae66c8 1410void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
e2d118a1 1411 int oif, u32 mark, kuid_t uid)
81aded24
DM		 1412{
1413 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1414 struct dst_entry *dst;
1415 struct flowi6 fl6;
1416
1417 memset(&fl6, 0, sizeof(fl6));
1418 fl6.flowi6_oif = oif;
1b3c61dc 1419 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1420 fl6.daddr = iph->daddr;
1421 fl6.saddr = iph->saddr;
6502ca52 1422 fl6.flowlabel = ip6_flowinfo(iph);
e2d118a1 1423 fl6.flowi6_uid = uid;
81aded24
DM		 1424
1425 dst = ip6_route_output(net, NULL, &fl6);
1426 if (!dst->error)
45e4fd26 1427 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1428 dst_release(dst);
1429}
1430EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1431
1432void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1433{
33c162a9
MKL		 1434 struct dst_entry *dst;
1435
81aded24 1436 ip6_update_pmtu(skb, sock_net(sk), mtu,
e2d118a1 1437 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
33c162a9
MKL		 1438
1439 dst = __sk_dst_get(sk);
1440 if (!dst || !dst->obsolete ||
1441 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1442 return;
1443
1444 bh_lock_sock(sk);
1445 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1446 ip6_datagram_dst_update(sk, false);
1447 bh_unlock_sock(sk);
81aded24
DM		 1448}
1449EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1450
b55b76b2
DJ		 1451/* Handle redirects */
1452struct ip6rd_flowi {
1453 struct flowi6 fl6;
1454 struct in6_addr gateway;
1455};
1456
1457static struct rt6_info *__ip6_route_redirect(struct net *net,
1458 struct fib6_table *table,
1459 struct flowi6 *fl6,
1460 int flags)
1461{
1462 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1463 struct rt6_info *rt;
1464 struct fib6_node *fn;
1465
1466 /* Get the "current" route for this destination and
67c408cf 1467 * check if the redirect has come from appropriate router.
b55b76b2
DJ		 1468 *
1469 * RFC 4861 specifies that redirects should only be
1470 * accepted if they come from the nexthop to the target.
1471 * Due to the way the routes are chosen, this notion
1472 * is a bit fuzzy and one might need to check all possible
1473 * routes.
1474 */
1475
1476 read_lock_bh(&table->tb6_lock);
1477 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1478restart:
1479 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1480 if (rt6_check_expired(rt))
1481 continue;
1482 if (rt->dst.error)
1483 break;
1484 if (!(rt->rt6i_flags & RTF_GATEWAY))
1485 continue;
1486 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1487 continue;
1488 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1489 continue;
1490 break;
1491 }
1492
1493 if (!rt)
1494 rt = net->ipv6.ip6_null_entry;
1495 else if (rt->dst.error) {
1496 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1497 goto out;
1498 }
1499
1500 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1501 fn = fib6_backtrack(fn, &fl6->saddr);
1502 if (fn)
1503 goto restart;
b55b76b2 1504 }
a3c00e46 1505
b0a1ba59 1506out:
b55b76b2
DJ		 1507 dst_hold(&rt->dst);
1508
1509 read_unlock_bh(&table->tb6_lock);
1510
b811580d 1511 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
b55b76b2
DJ		 1512 return rt;
1513};
1514
1515static struct dst_entry *ip6_route_redirect(struct net *net,
1516 const struct flowi6 *fl6,
1517 const struct in6_addr *gateway)
1518{
1519 int flags = RT6_LOOKUP_F_HAS_SADDR;
1520 struct ip6rd_flowi rdfl;
1521
1522 rdfl.fl6 = *fl6;
1523 rdfl.gateway = *gateway;
1524
1525 return fib6_rule_lookup(net, &rdfl.fl6,
1526 flags, __ip6_route_redirect);
1527}
1528
e2d118a1
LC		 1529void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
1530 kuid_t uid)
3a5ad2ee
DM		 1531{
1532 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1533 struct dst_entry *dst;
1534 struct flowi6 fl6;
1535
1536 memset(&fl6, 0, sizeof(fl6));
e374c618 1537 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1538 fl6.flowi6_oif = oif;
1539 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1540 fl6.daddr = iph->daddr;
1541 fl6.saddr = iph->saddr;
6502ca52 1542 fl6.flowlabel = ip6_flowinfo(iph);
e2d118a1 1543 fl6.flowi6_uid = uid;
3a5ad2ee 1544
b55b76b2
DJ		 1545 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1546 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1547 dst_release(dst);
1548}
1549EXPORT_SYMBOL_GPL(ip6_redirect);
1550
c92a59ec
DJ		 1551void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1552 u32 mark)
1553{
1554 const struct ipv6hdr *iph = ipv6_hdr(skb);
1555 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1556 struct dst_entry *dst;
1557 struct flowi6 fl6;
1558
1559 memset(&fl6, 0, sizeof(fl6));
e374c618 1560 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1561 fl6.flowi6_oif = oif;
1562 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1563 fl6.daddr = msg->dest;
1564 fl6.saddr = iph->daddr;
e2d118a1 1565 fl6.flowi6_uid = sock_net_uid(net, NULL);
c92a59ec 1566
b55b76b2
DJ		 1567 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1568 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1569 dst_release(dst);
1570}
1571
3a5ad2ee
DM		 1572void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1573{
e2d118a1
LC		 1574 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
1575 sk->sk_uid);
3a5ad2ee
DM		 1576}
1577EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1578
0dbaee3b 1579static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1580{
0dbaee3b
DM		 1581 struct net_device *dev = dst->dev;
1582 unsigned int mtu = dst_mtu(dst);
1583 struct net *net = dev_net(dev);
1584
1da177e4
LT		 1585 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1586
5578689a
DL		 1587 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1588 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1589
1590 /*
1ab1457c
YH		 1591 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1592 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1593 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1594 * rely only on pmtu discovery"
1595 */
1596 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1597 mtu = IPV6_MAXPLEN;
1598 return mtu;
1599}
1600
ebb762f2 1601static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1602{
4b32b5ad
MKL		 1603 const struct rt6_info *rt = (const struct rt6_info *)dst;
1604 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1605 struct inet6_dev *idev;
618f9bc7 1606
4b32b5ad
MKL		 1607 if (mtu)
1608 goto out;
1609
1610 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1611 if (mtu)
30f78d8e 1612 goto out;
618f9bc7
SK		 1613
1614 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1615
1616 rcu_read_lock();
1617 idev = __in6_dev_get(dst->dev);
1618 if (idev)
1619 mtu = idev->cnf.mtu6;
1620 rcu_read_unlock();
1621
30f78d8e 1622out:
14972cbd
RP		 1623 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1624
1625 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
d33e4553
DM		 1626}
1627
3b00944c
YH		 1628static struct dst_entry *icmp6_dst_gc_list;
1629static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1630
3b00944c 1631struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1632 struct flowi6 *fl6)
1da177e4 1633{
87a11578 1634 struct dst_entry *dst;
1da177e4
LT		 1635 struct rt6_info *rt;
1636 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1637 struct net *net = dev_net(dev);
1da177e4 1638
38308473 1639 if (unlikely(!idev))
122bdf67 1640 return ERR_PTR(-ENODEV);
1da177e4 1641
ad706862 1642 rt = ip6_dst_alloc(net, dev, 0);
38308473 1643 if (unlikely(!rt)) {
1da177e4 1644 in6_dev_put(idev);
87a11578 1645 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1646 goto out;
1647 }
1648
8e2ec639
YZ		 1649 rt->dst.flags |= DST_HOST;
1650 rt->dst.output = ip6_output;
d8d1f30b 1651 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1652 rt->rt6i_gateway = fl6->daddr;
87a11578 1653 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1654 rt->rt6i_dst.plen = 128;
1655 rt->rt6i_idev = idev;
14edd87d 1656 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1657
3b00944c 1658 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1659 rt->dst.next = icmp6_dst_gc_list;
1660 icmp6_dst_gc_list = &rt->dst;
3b00944c 1661 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1662
5578689a 1663 fib6_force_start_gc(net);
1da177e4 1664
87a11578
DM		 1665 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1666
1da177e4 1667out:
87a11578 1668 return dst;
1da177e4
LT		 1669}
1670
3d0f24a7 1671int icmp6_dst_gc(void)
1da177e4 1672{
e9476e95 1673 struct dst_entry *dst, **pprev;
3d0f24a7 1674 int more = 0;
1da177e4 1675
3b00944c
YH		 1676 spin_lock_bh(&icmp6_dst_lock);
1677 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1678
1da177e4
LT		 1679 while ((dst = *pprev) != NULL) {
1680 if (!atomic_read(&dst->__refcnt)) {
1681 *pprev = dst->next;
1682 dst_free(dst);
1da177e4
LT		 1683 } else {
1684 pprev = &dst->next;
3d0f24a7 1685 ++more;
1da177e4
LT		 1686 }
1687 }
1688
3b00944c 1689 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1690
3d0f24a7 1691 return more;
1da177e4
LT		 1692}
1693
1e493d19
DM		 1694static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1695 void *arg)
1696{
1697 struct dst_entry *dst, **pprev;
1698
1699 spin_lock_bh(&icmp6_dst_lock);
1700 pprev = &icmp6_dst_gc_list;
1701 while ((dst = *pprev) != NULL) {
1702 struct rt6_info *rt = (struct rt6_info *) dst;
1703 if (func(rt, arg)) {
1704 *pprev = dst->next;
1705 dst_free(dst);
1706 } else {
1707 pprev = &dst->next;
1708 }
1709 }
1710 spin_unlock_bh(&icmp6_dst_lock);
1711}
1712
569d3645 1713static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1714{
86393e52 1715 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1716 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1717 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1718 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1719 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1720 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1721 int entries;
7019b78e 1722
fc66f95c 1723 entries = dst_entries_get_fast(ops);
49a18d86 1724 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1725 entries <= rt_max_size)
1da177e4
LT		 1726 goto out;
1727
6891a346 1728 net->ipv6.ip6_rt_gc_expire++;
14956643 1729 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1730 entries = dst_entries_get_slow(ops);
1731 if (entries < ops->gc_thresh)
7019b78e 1732 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1733out:
7019b78e 1734 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1735 return entries > rt_max_size;
1da177e4
LT		 1736}
1737
e715b6d3
FW		 1738static int ip6_convert_metrics(struct mx6_config *mxc,
1739 const struct fib6_config *cfg)
1740{
c3a8d947 1741 bool ecn_ca = false;
e715b6d3
FW		 1742 struct nlattr *nla;
1743 int remaining;
1744 u32 *mp;
1745
63159f29 1746 if (!cfg->fc_mx)
e715b6d3
FW		 1747 return 0;
1748
1749 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1750 if (unlikely(!mp))
1751 return -ENOMEM;
1752
1753 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1754 int type = nla_type(nla);
1bb14807 1755 u32 val;
e715b6d3 1756
1bb14807
DB		 1757 if (!type)
1758 continue;
1759 if (unlikely(type > RTAX_MAX))
1760 goto err;
ea697639 1761
1bb14807
DB		 1762 if (type == RTAX_CC_ALGO) {
1763 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1764
1bb14807 1765 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1766 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1767 if (val == TCP_CA_UNSPEC)
1768 goto err;
1769 } else {
1770 val = nla_get_u32(nla);
e715b6d3 1771 }
626abd59
PA		 1772 if (type == RTAX_HOPLIMIT && val > 255)
1773 val = 255;
b8d3e416
DB		 1774 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1775 goto err;
1bb14807
DB		 1776
1777 mp[type - 1] = val;
1778 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1779 }
1780
c3a8d947
DB		 1781 if (ecn_ca) {
1782 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1783 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1784 }
e715b6d3 1785
c3a8d947 1786 mxc->mx = mp;
e715b6d3
FW		 1787 return 0;
1788 err:
1789 kfree(mp);
1790 return -EINVAL;
1791}
1da177e4 1792
8c14586f
DA		 1793static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1794 struct fib6_config *cfg,
1795 const struct in6_addr *gw_addr)
1796{
1797 struct flowi6 fl6 = {
1798 .flowi6_oif = cfg->fc_ifindex,
1799 .daddr = *gw_addr,
1800 .saddr = cfg->fc_prefsrc,
1801 };
1802 struct fib6_table *table;
1803 struct rt6_info *rt;
d5d32e4b 1804 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
8c14586f
DA		 1805
1806 table = fib6_get_table(net, cfg->fc_table);
1807 if (!table)
1808 return NULL;
1809
1810 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1811 flags |= RT6_LOOKUP_F_HAS_SADDR;
1812
1813 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1814
1815 /* if table lookup failed, fall back to full lookup */
1816 if (rt == net->ipv6.ip6_null_entry) {
1817 ip6_rt_put(rt);
1818 rt = NULL;
1819 }
1820
1821 return rt;
1822}
1823
8c5b83f0 1824static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1825{
5578689a 1826 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1827 struct rt6_info *rt = NULL;
1828 struct net_device *dev = NULL;
1829 struct inet6_dev *idev = NULL;
c71099ac 1830 struct fib6_table *table;
1da177e4 1831 int addr_type;
8c5b83f0 1832 int err = -EINVAL;
1da177e4 1833
86872cb5 1834 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1835 goto out;
1da177e4 1836#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1837 if (cfg->fc_src_len)
8c5b83f0 1838 goto out;
1da177e4 1839#endif
86872cb5 1840 if (cfg->fc_ifindex) {
1da177e4 1841 err = -ENODEV;
5578689a 1842 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1843 if (!dev)
1844 goto out;
1845 idev = in6_dev_get(dev);
1846 if (!idev)
1847 goto out;
1848 }
1849
86872cb5
TG		 1850 if (cfg->fc_metric == 0)
1851 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1852
d71314b4 1853 err = -ENOBUFS;
38308473
DM		 1854 if (cfg->fc_nlinfo.nlh &&
1855 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1856 table = fib6_get_table(net, cfg->fc_table);
38308473 1857 if (!table) {
f3213831 1858 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1859 table = fib6_new_table(net, cfg->fc_table);
1860 }
1861 } else {
1862 table = fib6_new_table(net, cfg->fc_table);
1863 }
38308473
DM		 1864
1865 if (!table)
c71099ac 1866 goto out;
c71099ac 1867
ad706862
MKL		 1868 rt = ip6_dst_alloc(net, NULL,
1869 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1870
38308473 1871 if (!rt) {
1da177e4
LT		 1872 err = -ENOMEM;
1873 goto out;
1874 }
1875
1716a961
G		 1876 if (cfg->fc_flags & RTF_EXPIRES)
1877 rt6_set_expires(rt, jiffies +
1878 clock_t_to_jiffies(cfg->fc_expires));
1879 else
1880 rt6_clean_expires(rt);
1da177e4 1881
86872cb5
TG		 1882 if (cfg->fc_protocol == RTPROT_UNSPEC)
1883 cfg->fc_protocol = RTPROT_BOOT;
1884 rt->rt6i_protocol = cfg->fc_protocol;
1885
1886 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1887
1888 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1889 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1890 else if (cfg->fc_flags & RTF_LOCAL)
1891 rt->dst.input = ip6_input;
1da177e4 1892 else
d8d1f30b 1893 rt->dst.input = ip6_forward;
1da177e4 1894
d8d1f30b 1895 rt->dst.output = ip6_output;
1da177e4 1896
19e42e45
RP		 1897 if (cfg->fc_encap) {
1898 struct lwtunnel_state *lwtstate;
1899
30357d7d 1900 err = lwtunnel_build_state(cfg->fc_encap_type,
127eb7cd
TH		 1901 cfg->fc_encap, AF_INET6, cfg,
1902 &lwtstate);
19e42e45
RP		 1903 if (err)
1904 goto out;
61adedf3
JB		 1905 rt->dst.lwtstate = lwtstate_get(lwtstate);
1906 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1907 rt->dst.lwtstate->orig_output = rt->dst.output;
1908 rt->dst.output = lwtunnel_output;
25368623 1909 }
61adedf3
JB		 1910 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1911 rt->dst.lwtstate->orig_input = rt->dst.input;
1912 rt->dst.input = lwtunnel_input;
25368623 1913 }
19e42e45
RP		 1914 }
1915
86872cb5
TG		 1916 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1917 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1918 if (rt->rt6i_dst.plen == 128)
e5fd387a 1919 rt->dst.flags |= DST_HOST;
e5fd387a 1920
1da177e4 1921#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1922 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1923 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1924#endif
1925
86872cb5 1926 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1927
1928 /* We cannot add true routes via loopback here,
1929 they would result in kernel looping; promote them to reject routes
1930 */
86872cb5 1931 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1932 (dev && (dev->flags & IFF_LOOPBACK) &&
1933 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1934 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1935 /* hold loopback dev/idev if we haven't done so. */
5578689a 1936 if (dev != net->loopback_dev) {
1da177e4
LT		 1937 if (dev) {
1938 dev_put(dev);
1939 in6_dev_put(idev);
1940 }
5578689a 1941 dev = net->loopback_dev;
1da177e4
LT		 1942 dev_hold(dev);
1943 idev = in6_dev_get(dev);
1944 if (!idev) {
1945 err = -ENODEV;
1946 goto out;
1947 }
1948 }
1da177e4 1949 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1950 switch (cfg->fc_type) {
1951 case RTN_BLACKHOLE:
1952 rt->dst.error = -EINVAL;
ede2059d 1953 rt->dst.output = dst_discard_out;
7150aede 1954 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1955 break;
1956 case RTN_PROHIBIT:
1957 rt->dst.error = -EACCES;
7150aede
K		 1958 rt->dst.output = ip6_pkt_prohibit_out;
1959 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1960 break;
b4949ab2 1961 case RTN_THROW:
0315e382 1962 case RTN_UNREACHABLE:
ef2c7d7b 1963 default:
7150aede 1964 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1965 : (cfg->fc_type == RTN_UNREACHABLE)
1966 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1967 rt->dst.output = ip6_pkt_discard_out;
1968 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1969 break;
1970 }
1da177e4
LT		 1971 goto install_route;
1972 }
1973
86872cb5 1974 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1975 const struct in6_addr *gw_addr;
1da177e4
LT		 1976 int gwa_type;
1977
86872cb5 1978 gw_addr = &cfg->fc_gateway;
330567b7 1979 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1980
1981 /* if gw_addr is local we will fail to detect this in case
1982 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1983 * will return already-added prefix route via interface that
1984 * prefix route was assigned to, which might be non-loopback.
1985 */
1986 err = -EINVAL;
330567b7
FW		 1987 if (ipv6_chk_addr_and_flags(net, gw_addr,
1988 gwa_type & IPV6_ADDR_LINKLOCAL ?
1989 dev : NULL, 0, 0))
48ed7b26
FW		 1990 goto out;
1991
4e3fd7a0 1992 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1993
1994 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
8c14586f 1995 struct rt6_info *grt = NULL;
1da177e4
LT		 1996
1997 /* IPv6 strictly inhibits using not link-local
1998 addresses as nexthop address.
1999 Otherwise, router will not able to send redirects.
2000 It is very good, but in some (rare!) circumstances
2001 (SIT, PtP, NBMA NOARP links) it is handy to allow
2002 some exceptions. --ANK
96d5822c
EN		 2003 We allow IPv4-mapped nexthops to support RFC4798-type
2004 addressing
1da177e4 2005 */
96d5822c
EN		 2006 if (!(gwa_type & (IPV6_ADDR_UNICAST |
2007 IPV6_ADDR_MAPPED)))
1da177e4
LT		 2008 goto out;
2009
a435a07f 2010 if (cfg->fc_table) {
8c14586f
DA		 2011 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
2012
a435a07f
VB		 2013 if (grt) {
2014 if (grt->rt6i_flags & RTF_GATEWAY ||
2015 (dev && dev != grt->dst.dev)) {
2016 ip6_rt_put(grt);
2017 grt = NULL;
2018 }
2019 }
2020 }
2021
8c14586f
DA		 2022 if (!grt)
2023 grt = rt6_lookup(net, gw_addr, NULL,
2024 cfg->fc_ifindex, 1);
1da177e4
LT		 2025
2026 err = -EHOSTUNREACH;
38308473 2027 if (!grt)
1da177e4
LT		 2028 goto out;
2029 if (dev) {
d1918542 2030 if (dev != grt->dst.dev) {
94e187c0 2031 ip6_rt_put(grt);
1da177e4
LT		 2032 goto out;
2033 }
2034 } else {
d1918542 2035 dev = grt->dst.dev;
1da177e4
LT		 2036 idev = grt->rt6i_idev;
2037 dev_hold(dev);
2038 in6_dev_hold(grt->rt6i_idev);
2039 }
38308473 2040 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 2041 err = 0;
94e187c0 2042 ip6_rt_put(grt);
1da177e4
LT		 2043
2044 if (err)
2045 goto out;
2046 }
2047 err = -EINVAL;
38308473 2048 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2049 goto out;
2050 }
2051
2052 err = -ENODEV;
38308473 2053 if (!dev)
1da177e4
LT		 2054 goto out;
2055
c3968a85
DW		 2056 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2057 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2058 err = -EINVAL;
2059 goto out;
2060 }
4e3fd7a0 2061 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 2062 rt->rt6i_prefsrc.plen = 128;
2063 } else
2064 rt->rt6i_prefsrc.plen = 0;
2065
86872cb5 2066 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2067
2068install_route:
d8d1f30b 2069 rt->dst.dev = dev;
1da177e4 2070 rt->rt6i_idev = idev;
c71099ac 2071 rt->rt6i_table = table;
63152fc0 2072
c346dca1 2073 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2074
8c5b83f0 2075 return rt;
6b9ea5a6
RP		 2076out:
2077 if (dev)
2078 dev_put(dev);
2079 if (idev)
2080 in6_dev_put(idev);
2081 if (rt)
2082 dst_free(&rt->dst);
2083
8c5b83f0 2084 return ERR_PTR(err);
6b9ea5a6
RP		 2085}
2086
2087int ip6_route_add(struct fib6_config *cfg)
2088{
2089 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2090 struct rt6_info *rt;
6b9ea5a6
RP		 2091 int err;
2092
8c5b83f0
RP		 2093 rt = ip6_route_info_create(cfg);
2094 if (IS_ERR(rt)) {
2095 err = PTR_ERR(rt);
2096 rt = NULL;
6b9ea5a6 2097 goto out;
8c5b83f0 2098 }
6b9ea5a6 2099
e715b6d3
FW		 2100 err = ip6_convert_metrics(&mxc, cfg);
2101 if (err)
2102 goto out;
1da177e4 2103
e715b6d3
FW		 2104 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2105
2106 kfree(mxc.mx);
6b9ea5a6 2107
e715b6d3 2108 return err;
1da177e4 2109out:
1da177e4 2110 if (rt)
d8d1f30b 2111 dst_free(&rt->dst);
6b9ea5a6 2112
1da177e4
LT		 2113 return err;
2114}
2115
86872cb5 2116static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2117{
2118 int err;
c71099ac 2119 struct fib6_table *table;
d1918542 2120 struct net *net = dev_net(rt->dst.dev);
1da177e4 2121
8e3d5be7
MKL		 2122 if (rt == net->ipv6.ip6_null_entry ||
2123 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2124 err = -ENOENT;
2125 goto out;
2126 }
6c813a72 2127
c71099ac
TG		 2128 table = rt->rt6i_table;
2129 write_lock_bh(&table->tb6_lock);
86872cb5 2130 err = fib6_del(rt, info);
c71099ac 2131 write_unlock_bh(&table->tb6_lock);
1da177e4 2132
6825a26c 2133out:
94e187c0 2134 ip6_rt_put(rt);
1da177e4
LT		 2135 return err;
2136}
2137
e0a1ad73
TG		 2138int ip6_del_rt(struct rt6_info *rt)
2139{
4d1169c1 2140 struct nl_info info = {
d1918542 2141 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2142 };
528c4ceb 2143 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2144}
2145
86872cb5 2146static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2147{
c71099ac 2148 struct fib6_table *table;
1da177e4
LT		 2149 struct fib6_node *fn;
2150 struct rt6_info *rt;
2151 int err = -ESRCH;
2152
5578689a 2153 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2154 if (!table)
c71099ac
TG		 2155 return err;
2156
2157 read_lock_bh(&table->tb6_lock);
1da177e4 2158
c71099ac 2159 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2160 &cfg->fc_dst, cfg->fc_dst_len,
2161 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2162
1da177e4 2163 if (fn) {
d8d1f30b 2164 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2165 if ((rt->rt6i_flags & RTF_CACHE) &&
2166 !(cfg->fc_flags & RTF_CACHE))
2167 continue;
86872cb5 2168 if (cfg->fc_ifindex &&
d1918542
DM		 2169 (!rt->dst.dev ||
2170 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2171 continue;
86872cb5
TG		 2172 if (cfg->fc_flags & RTF_GATEWAY &&
2173 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2174 continue;
86872cb5 2175 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2176 continue;
c2ed1880
M		 2177 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
2178 continue;
d8d1f30b 2179 dst_hold(&rt->dst);
c71099ac 2180 read_unlock_bh(&table->tb6_lock);
1da177e4 2181
86872cb5 2182 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2183 }
2184 }
c71099ac 2185 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2186
2187 return err;
2188}
2189
6700c270 2190static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2191{
a6279458 2192 struct netevent_redirect netevent;
e8599ff4 2193 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2194 struct ndisc_options ndopts;
2195 struct inet6_dev *in6_dev;
2196 struct neighbour *neigh;
71bcdba0 2197 struct rd_msg *msg;
6e157b6a
DM		 2198 int optlen, on_link;
2199 u8 *lladdr;
e8599ff4 2200
29a3cad5 2201 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2202 optlen -= sizeof(*msg);
e8599ff4
DM		 2203
2204 if (optlen < 0) {
6e157b6a 2205 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2206 return;
2207 }
2208
71bcdba0 2209 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2210
71bcdba0 2211 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2212 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2213 return;
2214 }
2215
6e157b6a 2216 on_link = 0;
71bcdba0 2217 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2218 on_link = 1;
71bcdba0 2219 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2220 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2221 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2222 return;
2223 }
2224
2225 in6_dev = __in6_dev_get(skb->dev);
2226 if (!in6_dev)
2227 return;
2228 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2229 return;
2230
2231 /* RFC2461 8.1:
2232 * The IP source address of the Redirect MUST be the same as the current
2233 * first-hop router for the specified ICMP Destination Address.
2234 */
2235
f997c55c 2236 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2237 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2238 return;
2239 }
6e157b6a
DM		 2240
2241 lladdr = NULL;
e8599ff4
DM		 2242 if (ndopts.nd_opts_tgt_lladdr) {
2243 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2244 skb->dev);
2245 if (!lladdr) {
2246 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2247 return;
2248 }
2249 }
2250
6e157b6a 2251 rt = (struct rt6_info *) dst;
ec13ad1d 2252 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2253 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2254 return;
6e157b6a 2255 }
e8599ff4 2256
6e157b6a
DM		 2257 /* Redirect received -> path was valid.
2258 * Look, redirects are sent only in response to data packets,
2259 * so that this nexthop apparently is reachable. --ANK
2260 */
2261 dst_confirm(&rt->dst);
a6279458 2262
71bcdba0 2263 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2264 if (!neigh)
2265 return;
a6279458 2266
1da177e4
LT		 2267 /*
2268 * We have finally decided to accept it.
2269 */
2270
f997c55c 2271 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 2272 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2273 NEIGH_UPDATE_F_OVERRIDE|
2274 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 2275 NEIGH_UPDATE_F_ISROUTER)),
2276 NDISC_REDIRECT, &ndopts);
1da177e4 2277
83a09abd 2278 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2279 if (!nrt)
1da177e4
LT		 2280 goto out;
2281
2282 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2283 if (on_link)
2284 nrt->rt6i_flags &= ~RTF_GATEWAY;
2285
4e3fd7a0 2286 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2287
40e22e8f 2288 if (ip6_ins_rt(nrt))
1da177e4
LT		 2289 goto out;
2290
d8d1f30b
CG		 2291 netevent.old = &rt->dst;
2292 netevent.new = &nrt->dst;
71bcdba0 2293 netevent.daddr = &msg->dest;
60592833 2294 netevent.neigh = neigh;
8d71740c
TT		 2295 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2296
38308473 2297 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2298 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2299 ip6_del_rt(rt);
1da177e4
LT		 2300 }
2301
2302out:
e8599ff4 2303 neigh_release(neigh);
6e157b6a
DM		 2304}
2305
1da177e4
LT		 2306/*
2307 * Misc support functions
2308 */
2309
4b32b5ad
MKL		 2310static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2311{
2312 BUG_ON(from->dst.from);
2313
2314 rt->rt6i_flags &= ~RTF_EXPIRES;
2315 dst_hold(&from->dst);
2316 rt->dst.from = &from->dst;
2317 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2318}
2319
83a09abd
MKL		 2320static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2321{
2322 rt->dst.input = ort->dst.input;
2323 rt->dst.output = ort->dst.output;
2324 rt->rt6i_dst = ort->rt6i_dst;
2325 rt->dst.error = ort->dst.error;
2326 rt->rt6i_idev = ort->rt6i_idev;
2327 if (rt->rt6i_idev)
2328 in6_dev_hold(rt->rt6i_idev);
2329 rt->dst.lastuse = jiffies;
2330 rt->rt6i_gateway = ort->rt6i_gateway;
2331 rt->rt6i_flags = ort->rt6i_flags;
2332 rt6_set_from(rt, ort);
2333 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2334#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2335 rt->rt6i_src = ort->rt6i_src;
1da177e4 2336#endif
83a09abd
MKL		 2337 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2338 rt->rt6i_table = ort->rt6i_table;
61adedf3 2339 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2340}
2341
70ceb4f5 2342#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2343static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42 2344 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 2345 const struct in6_addr *gwaddr,
2346 struct net_device *dev)
70ceb4f5 2347{
830218c1
DA		 2348 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
2349 int ifindex = dev->ifindex;
70ceb4f5
YH		 2350 struct fib6_node *fn;
2351 struct rt6_info *rt = NULL;
c71099ac
TG		 2352 struct fib6_table *table;
2353
830218c1 2354 table = fib6_get_table(net, tb_id);
38308473 2355 if (!table)
c71099ac 2356 return NULL;
70ceb4f5 2357
5744dd9b 2358 read_lock_bh(&table->tb6_lock);
67ba4152 2359 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2360 if (!fn)
2361 goto out;
2362
d8d1f30b 2363 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2364 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2365 continue;
2366 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2367 continue;
2368 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2369 continue;
d8d1f30b 2370 dst_hold(&rt->dst);
70ceb4f5
YH		 2371 break;
2372 }
2373out:
5744dd9b 2374 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2375 return rt;
2376}
2377
efa2cea0 2378static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42 2379 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 2380 const struct in6_addr *gwaddr,
2381 struct net_device *dev,
95c96174 2382 unsigned int pref)
70ceb4f5 2383{
86872cb5 2384 struct fib6_config cfg = {
238fc7ea 2385 .fc_metric = IP6_RT_PRIO_USER,
830218c1 2386 .fc_ifindex = dev->ifindex,
86872cb5
TG		 2387 .fc_dst_len = prefixlen,
2388 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2389 RTF_UP | RTF_PREF(pref),
15e47304 2390 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2391 .fc_nlinfo.nlh = NULL,
2392 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2393 };
2394
830218c1 2395 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
4e3fd7a0
AD		 2396 cfg.fc_dst = *prefix;
2397 cfg.fc_gateway = *gwaddr;
70ceb4f5 2398
e317da96
YH		 2399 /* We should treat it as a default route if prefix length is 0. */
2400 if (!prefixlen)
86872cb5 2401 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2402
86872cb5 2403 ip6_route_add(&cfg);
70ceb4f5 2404
830218c1 2405 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
70ceb4f5
YH		 2406}
2407#endif
2408
b71d1d42 2409struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2410{
830218c1 2411 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
1da177e4 2412 struct rt6_info *rt;
c71099ac 2413 struct fib6_table *table;
1da177e4 2414
830218c1 2415 table = fib6_get_table(dev_net(dev), tb_id);
38308473 2416 if (!table)
c71099ac 2417 return NULL;
1da177e4 2418
5744dd9b 2419 read_lock_bh(&table->tb6_lock);
67ba4152 2420 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2421 if (dev == rt->dst.dev &&
045927ff 2422 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2423 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2424 break;
2425 }
2426 if (rt)
d8d1f30b 2427 dst_hold(&rt->dst);
5744dd9b 2428 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2429 return rt;
2430}
2431
b71d1d42 2432struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2433 struct net_device *dev,
2434 unsigned int pref)
1da177e4 2435{
86872cb5 2436 struct fib6_config cfg = {
ca254490 2437 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2438 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2439 .fc_ifindex = dev->ifindex,
2440 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2441 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2442 .fc_nlinfo.portid = 0,
5578689a 2443 .fc_nlinfo.nlh = NULL,
c346dca1 2444 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2445 };
1da177e4 2446
4e3fd7a0 2447 cfg.fc_gateway = *gwaddr;
1da177e4 2448
830218c1
DA		 2449 if (!ip6_route_add(&cfg)) {
2450 struct fib6_table *table;
2451
2452 table = fib6_get_table(dev_net(dev), cfg.fc_table);
2453 if (table)
2454 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
2455 }
1da177e4 2456
1da177e4
LT		 2457 return rt6_get_dflt_router(gwaddr, dev);
2458}
2459
830218c1 2460static void __rt6_purge_dflt_routers(struct fib6_table *table)
1da177e4
LT		 2461{
2462 struct rt6_info *rt;
2463
2464restart:
c71099ac 2465 read_lock_bh(&table->tb6_lock);
d8d1f30b 2466 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2467 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2468 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2469 dst_hold(&rt->dst);
c71099ac 2470 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2471 ip6_del_rt(rt);
1da177e4
LT		 2472 goto restart;
2473 }
2474 }
c71099ac 2475 read_unlock_bh(&table->tb6_lock);
830218c1
DA		 2476
2477 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
2478}
2479
2480void rt6_purge_dflt_routers(struct net *net)
2481{
2482 struct fib6_table *table;
2483 struct hlist_head *head;
2484 unsigned int h;
2485
2486 rcu_read_lock();
2487
2488 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
2489 head = &net->ipv6.fib_table_hash[h];
2490 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
2491 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
2492 __rt6_purge_dflt_routers(table);
2493 }
2494 }
2495
2496 rcu_read_unlock();
1da177e4
LT		 2497}
2498
5578689a
DL		 2499static void rtmsg_to_fib6_config(struct net *net,
2500 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2501 struct fib6_config *cfg)
2502{
2503 memset(cfg, 0, sizeof(*cfg));
2504
ca254490
DA		 2505 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2506 : RT6_TABLE_MAIN;
86872cb5
TG		 2507 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2508 cfg->fc_metric = rtmsg->rtmsg_metric;
2509 cfg->fc_expires = rtmsg->rtmsg_info;
2510 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2511 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2512 cfg->fc_flags = rtmsg->rtmsg_flags;
2513
5578689a 2514 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2515
4e3fd7a0
AD		 2516 cfg->fc_dst = rtmsg->rtmsg_dst;
2517 cfg->fc_src = rtmsg->rtmsg_src;
2518 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2519}
2520
5578689a 2521int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2522{
86872cb5 2523 struct fib6_config cfg;
1da177e4
LT		 2524 struct in6_rtmsg rtmsg;
2525 int err;
2526
67ba4152 2527 switch (cmd) {
1da177e4
LT		 2528 case SIOCADDRT: /* Add a route */
2529 case SIOCDELRT: /* Delete a route */
af31f412 2530 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2531 return -EPERM;
2532 err = copy_from_user(&rtmsg, arg,
2533 sizeof(struct in6_rtmsg));
2534 if (err)
2535 return -EFAULT;
86872cb5 2536
5578689a 2537 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2538
1da177e4
LT		 2539 rtnl_lock();
2540 switch (cmd) {
2541 case SIOCADDRT:
86872cb5 2542 err = ip6_route_add(&cfg);
1da177e4
LT		 2543 break;
2544 case SIOCDELRT:
86872cb5 2545 err = ip6_route_del(&cfg);
1da177e4
LT		 2546 break;
2547 default:
2548 err = -EINVAL;
2549 }
2550 rtnl_unlock();
2551
2552 return err;
3ff50b79 2553 }
1da177e4
LT		 2554
2555 return -EINVAL;
2556}
2557
2558/*
2559 * Drop the packet on the floor
2560 */
2561
d5fdd6ba 2562static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2563{
612f09e8 2564 int type;
adf30907 2565 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2566 switch (ipstats_mib_noroutes) {
2567 case IPSTATS_MIB_INNOROUTES:
0660e03f 2568 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2569 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2570 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2571 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2572 break;
2573 }
2574 /* FALLTHROUGH */
2575 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2576 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2577 ipstats_mib_noroutes);
612f09e8
YH		 2578 break;
2579 }
3ffe533c 2580 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2581 kfree_skb(skb);
2582 return 0;
2583}
2584
9ce8ade0
TG		 2585static int ip6_pkt_discard(struct sk_buff *skb)
2586{
612f09e8 2587 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2588}
2589
ede2059d 2590static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2591{
adf30907 2592 skb->dev = skb_dst(skb)->dev;
612f09e8 2593 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2594}
2595
9ce8ade0
TG		 2596static int ip6_pkt_prohibit(struct sk_buff *skb)
2597{
612f09e8 2598 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2599}
2600
ede2059d 2601static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2602{
adf30907 2603 skb->dev = skb_dst(skb)->dev;
612f09e8 2604 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2605}
2606
1da177e4
LT		 2607/*
2608 * Allocate a dst for local (unicast / anycast) address.
2609 */
2610
2611struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2612 const struct in6_addr *addr,
8f031519 2613 bool anycast)
1da177e4 2614{
ca254490 2615 u32 tb_id;
c346dca1 2616 struct net *net = dev_net(idev->dev);
5f02ce24
DA		 2617 struct net_device *dev = net->loopback_dev;
2618 struct rt6_info *rt;
2619
2620 /* use L3 Master device as loopback for host routes if device
2621 * is enslaved and address is not link local or multicast
2622 */
2623 if (!rt6_need_strict(addr))
2624 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2625
2626 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
a3300ef4 2627 if (!rt)
1da177e4
LT		 2628 return ERR_PTR(-ENOMEM);
2629
1da177e4
LT		 2630 in6_dev_hold(idev);
2631
11d53b49 2632 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2633 rt->dst.input = ip6_input;
2634 rt->dst.output = ip6_output;
1da177e4 2635 rt->rt6i_idev = idev;
1da177e4
LT		 2636
2637 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2638 if (anycast)
2639 rt->rt6i_flags |= RTF_ANYCAST;
2640 else
1da177e4 2641 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2642
550bab42 2643 rt->rt6i_gateway = *addr;
4e3fd7a0 2644 rt->rt6i_dst.addr = *addr;
1da177e4 2645 rt->rt6i_dst.plen = 128;
ca254490
DA		 2646 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2647 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2648 rt->dst.flags |= DST_NOCACHE;
1da177e4 2649
d8d1f30b 2650 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2651
2652 return rt;
2653}
2654
c3968a85
DW		 2655/* remove deleted ip from prefsrc entries */
2656struct arg_dev_net_ip {
2657 struct net_device *dev;
2658 struct net *net;
2659 struct in6_addr *addr;
2660};
2661
2662static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2663{
2664 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2665 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2666 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2667
d1918542 2668 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2669 rt != net->ipv6.ip6_null_entry &&
2670 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2671 /* remove prefsrc entry */
2672 rt->rt6i_prefsrc.plen = 0;
2673 }
2674 return 0;
2675}
2676
2677void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2678{
2679 struct net *net = dev_net(ifp->idev->dev);
2680 struct arg_dev_net_ip adni = {
2681 .dev = ifp->idev->dev,
2682 .net = net,
2683 .addr = &ifp->addr,
2684 };
0c3584d5 2685 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2686}
2687
be7a010d
DJ		 2688#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2689#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2690
2691/* Remove routers and update dst entries when gateway turn into host. */
2692static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2693{
2694 struct in6_addr *gateway = (struct in6_addr *)arg;
2695
2696 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2697 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2698 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2699 return -1;
2700 }
2701 return 0;
2702}
2703
2704void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2705{
2706 fib6_clean_all(net, fib6_clean_tohost, gateway);
2707}
2708
8ed67789
DL		 2709struct arg_dev_net {
2710 struct net_device *dev;
2711 struct net *net;
2712};
2713
a1a22c12 2714/* called with write lock held for table with rt */
1da177e4
LT		 2715static int fib6_ifdown(struct rt6_info *rt, void *arg)
2716{
bc3ef660 2717 const struct arg_dev_net *adn = arg;
2718 const struct net_device *dev = adn->dev;
8ed67789 2719
d1918542 2720 if ((rt->dst.dev == dev || !dev) &&
a1a22c12
DA		 2721 rt != adn->net->ipv6.ip6_null_entry &&
2722 (rt->rt6i_nsiblings == 0 ||
2723 !rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
1da177e4 2724 return -1;
c159d30c 2725
1da177e4
LT		 2726 return 0;
2727}
2728
f3db4851 2729void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2730{
8ed67789
DL		 2731 struct arg_dev_net adn = {
2732 .dev = dev,
2733 .net = net,
2734 };
2735
0c3584d5 2736 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2737 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2738 if (dev)
2739 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2740}
2741
95c96174 2742struct rt6_mtu_change_arg {
1da177e4 2743 struct net_device *dev;
95c96174 2744 unsigned int mtu;
1da177e4
LT		 2745};
2746
2747static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2748{
2749 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2750 struct inet6_dev *idev;
2751
2752 /* In IPv6 pmtu discovery is not optional,
2753 so that RTAX_MTU lock cannot disable it.
2754 We still use this lock to block changes
2755 caused by addrconf/ndisc.
2756 */
2757
2758 idev = __in6_dev_get(arg->dev);
38308473 2759 if (!idev)
1da177e4
LT		 2760 return 0;
2761
2762 /* For administrative MTU increase, there is no way to discover
2763 IPv6 PMTU increase, so PMTU increase should be updated here.
2764 Since RFC 1981 doesn't include administrative MTU increase
2765 update PMTU increase is a MUST. (i.e. jumbo frame)
2766 */
2767 /*
2768 If new MTU is less than route PMTU, this new MTU will be the
2769 lowest MTU in the path, update the route PMTU to reflect PMTU
2770 decreases; if new MTU is greater than route PMTU, and the
2771 old MTU is the lowest MTU in the path, update the route PMTU
2772 to reflect the increase. In this case if the other nodes' MTU
2773 also have the lowest MTU, TOO BIG MESSAGE will be lead to
67c408cf 2774 PMTU discovery.
1da177e4 2775 */
d1918542 2776 if (rt->dst.dev == arg->dev &&
fb56be83 2777 dst_metric_raw(&rt->dst, RTAX_MTU) &&
4b32b5ad
MKL		 2778 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2779 if (rt->rt6i_flags & RTF_CACHE) {
2780 /* For RTF_CACHE with rt6i_pmtu == 0
2781 * (i.e. a redirected route),
2782 * the metrics of its rt->dst.from has already
2783 * been updated.
2784 */
2785 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2786 rt->rt6i_pmtu = arg->mtu;
2787 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2788 (dst_mtu(&rt->dst) < arg->mtu &&
2789 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2790 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2791 }
566cfd8f 2792 }
1da177e4
LT		 2793 return 0;
2794}
2795
95c96174 2796void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2797{
c71099ac
TG		 2798 struct rt6_mtu_change_arg arg = {
2799 .dev = dev,
2800 .mtu = mtu,
2801 };
1da177e4 2802
0c3584d5 2803 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2804}
2805
ef7c79ed 2806static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2807 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2808 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2809 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2810 [RTA_PRIORITY] = { .type = NLA_U32 },
2811 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2812 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2813 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2814 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2815 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2816 [RTA_EXPIRES] = { .type = NLA_U32 },
622ec2c9 2817 [RTA_UID] = { .type = NLA_U32 },
86872cb5
TG		 2818};
2819
2820static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2821 struct fib6_config *cfg)
1da177e4 2822{
86872cb5
TG		 2823 struct rtmsg *rtm;
2824 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2825 unsigned int pref;
86872cb5 2826 int err;
1da177e4 2827
86872cb5
TG		 2828 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2829 if (err < 0)
2830 goto errout;
1da177e4 2831
86872cb5
TG		 2832 err = -EINVAL;
2833 rtm = nlmsg_data(nlh);
2834 memset(cfg, 0, sizeof(*cfg));
2835
2836 cfg->fc_table = rtm->rtm_table;
2837 cfg->fc_dst_len = rtm->rtm_dst_len;
2838 cfg->fc_src_len = rtm->rtm_src_len;
2839 cfg->fc_flags = RTF_UP;
2840 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2841 cfg->fc_type = rtm->rtm_type;
86872cb5 2842
ef2c7d7b
ND		 2843 if (rtm->rtm_type == RTN_UNREACHABLE ||
2844 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2845 rtm->rtm_type == RTN_PROHIBIT ||
2846 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2847 cfg->fc_flags |= RTF_REJECT;
2848
ab79ad14
MŻ		 2849 if (rtm->rtm_type == RTN_LOCAL)
2850 cfg->fc_flags |= RTF_LOCAL;
2851
1f56a01f
MKL		 2852 if (rtm->rtm_flags & RTM_F_CLONED)
2853 cfg->fc_flags |= RTF_CACHE;
2854
15e47304 2855 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2856 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2857 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2858
2859 if (tb[RTA_GATEWAY]) {
67b61f6c 2860 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2861 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2862 }
86872cb5
TG		 2863
2864 if (tb[RTA_DST]) {
2865 int plen = (rtm->rtm_dst_len + 7) >> 3;
2866
2867 if (nla_len(tb[RTA_DST]) < plen)
2868 goto errout;
2869
2870 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2871 }
86872cb5
TG		 2872
2873 if (tb[RTA_SRC]) {
2874 int plen = (rtm->rtm_src_len + 7) >> 3;
2875
2876 if (nla_len(tb[RTA_SRC]) < plen)
2877 goto errout;
2878
2879 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2880 }
86872cb5 2881
c3968a85 2882 if (tb[RTA_PREFSRC])
67b61f6c 2883 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2884
86872cb5
TG		 2885 if (tb[RTA_OIF])
2886 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2887
2888 if (tb[RTA_PRIORITY])
2889 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2890
2891 if (tb[RTA_METRICS]) {
2892 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2893 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2894 }
86872cb5
TG		 2895
2896 if (tb[RTA_TABLE])
2897 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2898
51ebd318
ND		 2899 if (tb[RTA_MULTIPATH]) {
2900 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2901 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
9ed59592
DA		 2902
2903 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
2904 cfg->fc_mp_len);
2905 if (err < 0)
2906 goto errout;
51ebd318
ND		 2907 }
2908
c78ba6d6
LR		 2909 if (tb[RTA_PREF]) {
2910 pref = nla_get_u8(tb[RTA_PREF]);
2911 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2912 pref != ICMPV6_ROUTER_PREF_HIGH)
2913 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2914 cfg->fc_flags |= RTF_PREF(pref);
2915 }
2916
19e42e45
RP		 2917 if (tb[RTA_ENCAP])
2918 cfg->fc_encap = tb[RTA_ENCAP];
2919
9ed59592 2920 if (tb[RTA_ENCAP_TYPE]) {
19e42e45
RP		 2921 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2922
9ed59592
DA		 2923 err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
2924 if (err < 0)
2925 goto errout;
2926 }
2927
32bc201e
XL		 2928 if (tb[RTA_EXPIRES]) {
2929 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2930
2931 if (addrconf_finite_timeout(timeout)) {
2932 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2933 cfg->fc_flags |= RTF_EXPIRES;
2934 }
2935 }
2936
86872cb5
TG		 2937 err = 0;
2938errout:
2939 return err;
1da177e4
LT		 2940}
2941
6b9ea5a6
RP		 2942struct rt6_nh {
2943 struct rt6_info *rt6_info;
2944 struct fib6_config r_cfg;
2945 struct mx6_config mxc;
2946 struct list_head next;
2947};
2948
2949static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2950{
2951 struct rt6_nh *nh;
2952
2953 list_for_each_entry(nh, rt6_nh_list, next) {
2954 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2955 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2956 nh->r_cfg.fc_ifindex);
2957 }
2958}
2959
2960static int ip6_route_info_append(struct list_head *rt6_nh_list,
2961 struct rt6_info *rt, struct fib6_config *r_cfg)
2962{
2963 struct rt6_nh *nh;
2964 struct rt6_info *rtnh;
2965 int err = -EEXIST;
2966
2967 list_for_each_entry(nh, rt6_nh_list, next) {
2968 /* check if rt6_info already exists */
2969 rtnh = nh->rt6_info;
2970
2971 if (rtnh->dst.dev == rt->dst.dev &&
2972 rtnh->rt6i_idev == rt->rt6i_idev &&
2973 ipv6_addr_equal(&rtnh->rt6i_gateway,
2974 &rt->rt6i_gateway))
2975 return err;
2976 }
2977
2978 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2979 if (!nh)
2980 return -ENOMEM;
2981 nh->rt6_info = rt;
2982 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2983 if (err) {
2984 kfree(nh);
2985 return err;
2986 }
2987 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2988 list_add_tail(&nh->next, rt6_nh_list);
2989
2990 return 0;
2991}
2992
2993static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2994{
2995 struct fib6_config r_cfg;
2996 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2997 struct rt6_info *rt;
2998 struct rt6_nh *err_nh;
2999 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 3000 int remaining;
3001 int attrlen;
6b9ea5a6
RP		 3002 int err = 1;
3003 int nhn = 0;
3004 int replace = (cfg->fc_nlinfo.nlh &&
3005 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
3006 LIST_HEAD(rt6_nh_list);
51ebd318 3007
35f1b4e9 3008 remaining = cfg->fc_mp_len;
51ebd318 3009 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 3010
6b9ea5a6
RP		 3011 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
3012 * rt6_info structs per nexthop
3013 */
51ebd318
ND		 3014 while (rtnh_ok(rtnh, remaining)) {
3015 memcpy(&r_cfg, cfg, sizeof(*cfg));
3016 if (rtnh->rtnh_ifindex)
3017 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3018
3019 attrlen = rtnh_attrlen(rtnh);
3020 if (attrlen > 0) {
3021 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3022
3023 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3024 if (nla) {
67b61f6c 3025 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 3026 r_cfg.fc_flags |= RTF_GATEWAY;
3027 }
19e42e45
RP		 3028 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
3029 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
3030 if (nla)
3031 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 3032 }
6b9ea5a6 3033
8c5b83f0
RP		 3034 rt = ip6_route_info_create(&r_cfg);
3035 if (IS_ERR(rt)) {
3036 err = PTR_ERR(rt);
3037 rt = NULL;
6b9ea5a6 3038 goto cleanup;
8c5b83f0 3039 }
6b9ea5a6
RP		 3040
3041 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 3042 if (err) {
6b9ea5a6
RP		 3043 dst_free(&rt->dst);
3044 goto cleanup;
3045 }
3046
3047 rtnh = rtnh_next(rtnh, &remaining);
3048 }
3049
3050 err_nh = NULL;
3051 list_for_each_entry(nh, &rt6_nh_list, next) {
3052 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
3053 /* nh->rt6_info is used or freed at this point, reset to NULL*/
3054 nh->rt6_info = NULL;
3055 if (err) {
3056 if (replace && nhn)
3057 ip6_print_replace_route_err(&rt6_nh_list);
3058 err_nh = nh;
3059 goto add_errout;
51ebd318 3060 }
6b9ea5a6 3061
1a72418b 3062 /* Because each route is added like a single route we remove
27596472
MK		 3063 * these flags after the first nexthop: if there is a collision,
3064 * we have already failed to add the first nexthop:
3065 * fib6_add_rt2node() has rejected it; when replacing, old
3066 * nexthops have been replaced by first new, the rest should
3067 * be added to it.
1a72418b 3068 */
27596472
MK		 3069 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3070 NLM_F_REPLACE);
6b9ea5a6
RP		 3071 nhn++;
3072 }
3073
3074 goto cleanup;
3075
3076add_errout:
3077 /* Delete routes that were already added */
3078 list_for_each_entry(nh, &rt6_nh_list, next) {
3079 if (err_nh == nh)
3080 break;
3081 ip6_route_del(&nh->r_cfg);
3082 }
3083
3084cleanup:
3085 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3086 if (nh->rt6_info)
3087 dst_free(&nh->rt6_info->dst);
52fe51f8 3088 kfree(nh->mxc.mx);
6b9ea5a6
RP		 3089 list_del(&nh->next);
3090 kfree(nh);
3091 }
3092
3093 return err;
3094}
3095
3096static int ip6_route_multipath_del(struct fib6_config *cfg)
3097{
3098 struct fib6_config r_cfg;
3099 struct rtnexthop *rtnh;
3100 int remaining;
3101 int attrlen;
3102 int err = 1, last_err = 0;
3103
3104 remaining = cfg->fc_mp_len;
3105 rtnh = (struct rtnexthop *)cfg->fc_mp;
3106
3107 /* Parse a Multipath Entry */
3108 while (rtnh_ok(rtnh, remaining)) {
3109 memcpy(&r_cfg, cfg, sizeof(*cfg));
3110 if (rtnh->rtnh_ifindex)
3111 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3112
3113 attrlen = rtnh_attrlen(rtnh);
3114 if (attrlen > 0) {
3115 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3116
3117 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3118 if (nla) {
3119 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3120 r_cfg.fc_flags |= RTF_GATEWAY;
3121 }
3122 }
3123 err = ip6_route_del(&r_cfg);
3124 if (err)
3125 last_err = err;
3126
51ebd318
ND		 3127 rtnh = rtnh_next(rtnh, &remaining);
3128 }
3129
3130 return last_err;
3131}
3132
67ba4152 3133static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3134{
86872cb5
TG		 3135 struct fib6_config cfg;
3136 int err;
1da177e4 3137
86872cb5
TG		 3138 err = rtm_to_fib6_config(skb, nlh, &cfg);
3139 if (err < 0)
3140 return err;
3141
51ebd318 3142 if (cfg.fc_mp)
6b9ea5a6 3143 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3144 else
3145 return ip6_route_del(&cfg);
1da177e4
LT		 3146}
3147
67ba4152 3148static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3149{
86872cb5
TG		 3150 struct fib6_config cfg;
3151 int err;
1da177e4 3152
86872cb5
TG		 3153 err = rtm_to_fib6_config(skb, nlh, &cfg);
3154 if (err < 0)
3155 return err;
3156
51ebd318 3157 if (cfg.fc_mp)
6b9ea5a6 3158 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3159 else
3160 return ip6_route_add(&cfg);
1da177e4
LT		 3161}
3162
19e42e45 3163static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3164{
3165 return NLMSG_ALIGN(sizeof(struct rtmsg))
3166 + nla_total_size(16) /* RTA_SRC */
3167 + nla_total_size(16) /* RTA_DST */
3168 + nla_total_size(16) /* RTA_GATEWAY */
3169 + nla_total_size(16) /* RTA_PREFSRC */
3170 + nla_total_size(4) /* RTA_TABLE */
3171 + nla_total_size(4) /* RTA_IIF */
3172 + nla_total_size(4) /* RTA_OIF */
3173 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3174 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3175 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3176 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3177 + nla_total_size(1) /* RTA_PREF */
61adedf3 3178 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3179}
3180
191cd582
BH		 3181static int rt6_fill_node(struct net *net,
3182 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3183 struct in6_addr *dst, struct in6_addr *src,
15e47304 3184 int iif, int type, u32 portid, u32 seq,
f8cfe2ce 3185 unsigned int flags)
1da177e4 3186{
4b32b5ad 3187 u32 metrics[RTAX_MAX];
1da177e4 3188 struct rtmsg *rtm;
2d7202bf 3189 struct nlmsghdr *nlh;
e3703b3d 3190 long expires;
9e762a4a 3191 u32 table;
1da177e4 3192
15e47304 3193 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3194 if (!nlh)
26932566 3195 return -EMSGSIZE;
2d7202bf
TG		 3196
3197 rtm = nlmsg_data(nlh);
1da177e4
LT		 3198 rtm->rtm_family = AF_INET6;
3199 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3200 rtm->rtm_src_len = rt->rt6i_src.plen;
3201 rtm->rtm_tos = 0;
c71099ac 3202 if (rt->rt6i_table)
9e762a4a 3203 table = rt->rt6i_table->tb6_id;
c71099ac 3204 else
9e762a4a
PM		 3205 table = RT6_TABLE_UNSPEC;
3206 rtm->rtm_table = table;
c78679e8
DM		 3207 if (nla_put_u32(skb, RTA_TABLE, table))
3208 goto nla_put_failure;
ef2c7d7b
ND		 3209 if (rt->rt6i_flags & RTF_REJECT) {
3210 switch (rt->dst.error) {
3211 case -EINVAL:
3212 rtm->rtm_type = RTN_BLACKHOLE;
3213 break;
3214 case -EACCES:
3215 rtm->rtm_type = RTN_PROHIBIT;
3216 break;
b4949ab2
ND		 3217 case -EAGAIN:
3218 rtm->rtm_type = RTN_THROW;
3219 break;
ef2c7d7b
ND		 3220 default:
3221 rtm->rtm_type = RTN_UNREACHABLE;
3222 break;
3223 }
3224 }
38308473 3225 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3226 rtm->rtm_type = RTN_LOCAL;
d1918542 3227 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3228 rtm->rtm_type = RTN_LOCAL;
3229 else
3230 rtm->rtm_type = RTN_UNICAST;
3231 rtm->rtm_flags = 0;
a1a22c12 3232 if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) {
cea45e20 3233 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3234 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3235 rtm->rtm_flags |= RTNH_F_DEAD;
3236 }
1da177e4
LT		 3237 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3238 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3239 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3240 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3241 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3242 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3243 rtm->rtm_protocol = RTPROT_RA;
3244 else
3245 rtm->rtm_protocol = RTPROT_KERNEL;
3246 }
1da177e4 3247
38308473 3248 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3249 rtm->rtm_flags |= RTM_F_CLONED;
3250
3251 if (dst) {
930345ea 3252 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3253 goto nla_put_failure;
1ab1457c 3254 rtm->rtm_dst_len = 128;
1da177e4 3255 } else if (rtm->rtm_dst_len)
930345ea 3256 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3257 goto nla_put_failure;
1da177e4
LT		 3258#ifdef CONFIG_IPV6_SUBTREES
3259 if (src) {
930345ea 3260 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3261 goto nla_put_failure;
1ab1457c 3262 rtm->rtm_src_len = 128;
c78679e8 3263 } else if (rtm->rtm_src_len &&
930345ea 3264 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3265 goto nla_put_failure;
1da177e4 3266#endif
7bc570c8
YH		 3267 if (iif) {
3268#ifdef CONFIG_IPV6_MROUTE
3269 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
fd61c6ba
DA		 3270 int err = ip6mr_get_route(net, skb, rtm, portid);
3271
3272 if (err == 0)
3273 return 0;
3274 if (err < 0)
3275 goto nla_put_failure;
7bc570c8
YH		 3276 } else
3277#endif
c78679e8
DM		 3278 if (nla_put_u32(skb, RTA_IIF, iif))
3279 goto nla_put_failure;
7bc570c8 3280 } else if (dst) {
1da177e4 3281 struct in6_addr saddr_buf;
c78679e8 3282 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3283 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3284 goto nla_put_failure;
1da177e4 3285 }
2d7202bf 3286
c3968a85
DW		 3287 if (rt->rt6i_prefsrc.plen) {
3288 struct in6_addr saddr_buf;
4e3fd7a0 3289 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3290 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3291 goto nla_put_failure;
c3968a85
DW		 3292 }
3293
4b32b5ad
MKL		 3294 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3295 if (rt->rt6i_pmtu)
3296 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3297 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3298 goto nla_put_failure;
3299
dd0cbf29 3300 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3301 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3302 goto nla_put_failure;
94f826b8 3303 }
2d7202bf 3304
c78679e8
DM		 3305 if (rt->dst.dev &&
3306 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3307 goto nla_put_failure;
3308 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3309 goto nla_put_failure;
8253947e
LW		 3310
3311 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3312
87a50699 3313 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3314 goto nla_put_failure;
2d7202bf 3315
c78ba6d6
LR		 3316 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3317 goto nla_put_failure;
3318
ea7a8085
DA		 3319 if (lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
3320 goto nla_put_failure;
19e42e45 3321
053c095a
JB		 3322 nlmsg_end(skb, nlh);
3323 return 0;
2d7202bf
TG		 3324
3325nla_put_failure:
26932566
PM		 3326 nlmsg_cancel(skb, nlh);
3327 return -EMSGSIZE;
1da177e4
LT		 3328}
3329
1b43af54 3330int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3331{
3332 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
1f17e2f2
DA		 3333 struct net *net = arg->net;
3334
3335 if (rt == net->ipv6.ip6_null_entry)
3336 return 0;
1da177e4 3337
2d7202bf
TG		 3338 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3339 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
f8cfe2ce
DA		 3340
3341 /* user wants prefix routes only */
3342 if (rtm->rtm_flags & RTM_F_PREFIX &&
3343 !(rt->rt6i_flags & RTF_PREFIX_RT)) {
3344 /* success since this is not a prefix route */
3345 return 1;
3346 }
3347 }
1da177e4 3348
1f17e2f2 3349 return rt6_fill_node(net,
191cd582 3350 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3351 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
f8cfe2ce 3352 NLM_F_MULTI);
1da177e4
LT		 3353}
3354
67ba4152 3355static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3356{
3b1e0a65 3357 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3358 struct nlattr *tb[RTA_MAX+1];
3359 struct rt6_info *rt;
1da177e4 3360 struct sk_buff *skb;
ab364a6f 3361 struct rtmsg *rtm;
4c9483b2 3362 struct flowi6 fl6;
72331bc0 3363 int err, iif = 0, oif = 0;
1da177e4 3364
ab364a6f
TG		 3365 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3366 if (err < 0)
3367 goto errout;
1da177e4 3368
ab364a6f 3369 err = -EINVAL;
4c9483b2 3370 memset(&fl6, 0, sizeof(fl6));
38b7097b
HFS		 3371 rtm = nlmsg_data(nlh);
3372 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
1da177e4 3373
ab364a6f
TG		 3374 if (tb[RTA_SRC]) {
3375 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3376 goto errout;
3377
4e3fd7a0 3378 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3379 }
3380
3381 if (tb[RTA_DST]) {
3382 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3383 goto errout;
3384
4e3fd7a0 3385 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3386 }
3387
3388 if (tb[RTA_IIF])
3389 iif = nla_get_u32(tb[RTA_IIF]);
3390
3391 if (tb[RTA_OIF])
72331bc0 3392 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3393
2e47b291
LC		 3394 if (tb[RTA_MARK])
3395 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3396
622ec2c9
LC		 3397 if (tb[RTA_UID])
3398 fl6.flowi6_uid = make_kuid(current_user_ns(),
3399 nla_get_u32(tb[RTA_UID]));
3400 else
3401 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3402
1da177e4
LT		 3403 if (iif) {
3404 struct net_device *dev;
72331bc0
SL		 3405 int flags = 0;
3406
5578689a 3407 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3408 if (!dev) {
3409 err = -ENODEV;
ab364a6f 3410 goto errout;
1da177e4 3411 }
72331bc0
SL		 3412
3413 fl6.flowi6_iif = iif;
3414
3415 if (!ipv6_addr_any(&fl6.saddr))
3416 flags |= RT6_LOOKUP_F_HAS_SADDR;
3417
3418 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3419 flags);
3420 } else {
3421 fl6.flowi6_oif = oif;
3422
3423 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3424 }
3425
ab364a6f 3426 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3427 if (!skb) {
94e187c0 3428 ip6_rt_put(rt);
ab364a6f
TG		 3429 err = -ENOBUFS;
3430 goto errout;
3431 }
1da177e4 3432
d8d1f30b 3433 skb_dst_set(skb, &rt->dst);
1da177e4 3434
4c9483b2 3435 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3436 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
f8cfe2ce 3437 nlh->nlmsg_seq, 0);
1da177e4 3438 if (err < 0) {
ab364a6f
TG		 3439 kfree_skb(skb);
3440 goto errout;
1da177e4
LT		 3441 }
3442
15e47304 3443 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3444errout:
1da177e4 3445 return err;
1da177e4
LT		 3446}
3447
37a1d361
RP		 3448void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3449 unsigned int nlm_flags)
1da177e4
LT		 3450{
3451 struct sk_buff *skb;
5578689a 3452 struct net *net = info->nl_net;
528c4ceb
DL		 3453 u32 seq;
3454 int err;
3455
3456 err = -ENOBUFS;
38308473 3457 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3458
19e42e45 3459 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3460 if (!skb)
21713ebc
TG		 3461 goto errout;
3462
191cd582 3463 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
f8cfe2ce 3464 event, info->portid, seq, nlm_flags);
26932566
PM		 3465 if (err < 0) {
3466 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3467 WARN_ON(err == -EMSGSIZE);
3468 kfree_skb(skb);
3469 goto errout;
3470 }
15e47304 3471 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3472 info->nlh, gfp_any());
3473 return;
21713ebc
TG		 3474errout:
3475 if (err < 0)
5578689a 3476 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3477}
3478
8ed67789 3479static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3480 unsigned long event, void *ptr)
8ed67789 3481{
351638e7 3482 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3483 struct net *net = dev_net(dev);
8ed67789
DL		 3484
3485 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3486 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3487 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3488#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3489 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3490 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3491 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3492 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3493#endif
3494 }
3495
3496 return NOTIFY_OK;
3497}
3498
1da177e4
LT		 3499/*
3500 * /proc
3501 */
3502
3503#ifdef CONFIG_PROC_FS
3504
33120b30
AD		 3505static const struct file_operations ipv6_route_proc_fops = {
3506 .owner = THIS_MODULE,
3507 .open = ipv6_route_open,
3508 .read = seq_read,
3509 .llseek = seq_lseek,
8d2ca1d7 3510 .release = seq_release_net,
33120b30
AD		 3511};
3512
1da177e4
LT		 3513static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3514{
69ddb805 3515 struct net *net = (struct net *)seq->private;
1da177e4 3516 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3517 net->ipv6.rt6_stats->fib_nodes,
3518 net->ipv6.rt6_stats->fib_route_nodes,
3519 net->ipv6.rt6_stats->fib_rt_alloc,
3520 net->ipv6.rt6_stats->fib_rt_entries,
3521 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3522 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3523 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3524
3525 return 0;
3526}
3527
3528static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3529{
de05c557 3530 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3531}
3532
9a32144e 3533static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3534 .owner = THIS_MODULE,
3535 .open = rt6_stats_seq_open,
3536 .read = seq_read,
3537 .llseek = seq_lseek,
b6fcbdb4 3538 .release = single_release_net,
1da177e4
LT		 3539};
3540#endif /* CONFIG_PROC_FS */
3541
3542#ifdef CONFIG_SYSCTL
3543
1da177e4 3544static
fe2c6338 3545int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3546 void __user *buffer, size_t *lenp, loff_t *ppos)
3547{
c486da34
LAG		 3548 struct net *net;
3549 int delay;
3550 if (!write)
1da177e4 3551 return -EINVAL;
c486da34
LAG		 3552
3553 net = (struct net *)ctl->extra1;
3554 delay = net->ipv6.sysctl.flush_delay;
3555 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3556 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3557 return 0;
1da177e4
LT		 3558}
3559
fe2c6338 3560struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3561 {
1da177e4 3562 .procname = "flush",
4990509f 3563 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3564 .maxlen = sizeof(int),
89c8b3a1 3565 .mode = 0200,
6d9f239a 3566 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3567 },
3568 {
1da177e4 3569 .procname = "gc_thresh",
9a7ec3a9 3570 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3571 .maxlen = sizeof(int),
3572 .mode = 0644,
6d9f239a 3573 .proc_handler = proc_dointvec,
1da177e4
LT		 3574 },
3575 {
1da177e4 3576 .procname = "max_size",
4990509f 3577 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3578 .maxlen = sizeof(int),
3579 .mode = 0644,
6d9f239a 3580 .proc_handler = proc_dointvec,
1da177e4
LT		 3581 },
3582 {
1da177e4 3583 .procname = "gc_min_interval",
4990509f 3584 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3585 .maxlen = sizeof(int),
3586 .mode = 0644,
6d9f239a 3587 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3588 },
3589 {
1da177e4 3590 .procname = "gc_timeout",
4990509f 3591 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3592 .maxlen = sizeof(int),
3593 .mode = 0644,
6d9f239a 3594 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3595 },
3596 {
1da177e4 3597 .procname = "gc_interval",
4990509f 3598 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3599 .maxlen = sizeof(int),
3600 .mode = 0644,
6d9f239a 3601 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3602 },
3603 {
1da177e4 3604 .procname = "gc_elasticity",
4990509f 3605 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3606 .maxlen = sizeof(int),
3607 .mode = 0644,
f3d3f616 3608 .proc_handler = proc_dointvec,
1da177e4
LT		 3609 },
3610 {
1da177e4 3611 .procname = "mtu_expires",
4990509f 3612 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3613 .maxlen = sizeof(int),
3614 .mode = 0644,
6d9f239a 3615 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3616 },
3617 {
1da177e4 3618 .procname = "min_adv_mss",
4990509f 3619 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3620 .maxlen = sizeof(int),
3621 .mode = 0644,
f3d3f616 3622 .proc_handler = proc_dointvec,
1da177e4
LT		 3623 },
3624 {
1da177e4 3625 .procname = "gc_min_interval_ms",
4990509f 3626 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3627 .maxlen = sizeof(int),
3628 .mode = 0644,
6d9f239a 3629 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3630 },
f8572d8f 3631 { }
1da177e4
LT		 3632};
3633
2c8c1e72 3634struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3635{
3636 struct ctl_table *table;
3637
3638 table = kmemdup(ipv6_route_table_template,
3639 sizeof(ipv6_route_table_template),
3640 GFP_KERNEL);
5ee09105
YH		 3641
3642 if (table) {
3643 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3644 table[0].extra1 = net;
86393e52 3645 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3646 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3647 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3648 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3649 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3650 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3651 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3652 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3653 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3654
3655 /* Don't export sysctls to unprivileged users */
3656 if (net->user_ns != &init_user_ns)
3657 table[0].procname = NULL;
5ee09105
YH		 3658 }
3659
760f2d01
DL		 3660 return table;
3661}
1da177e4
LT		 3662#endif
3663
2c8c1e72 3664static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3665{
633d424b 3666 int ret = -ENOMEM;
8ed67789 3667
86393e52
AD		 3668 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3669 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3670
fc66f95c
ED		 3671 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3672 goto out_ip6_dst_ops;
3673
8ed67789
DL		 3674 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3675 sizeof(*net->ipv6.ip6_null_entry),
3676 GFP_KERNEL);
3677 if (!net->ipv6.ip6_null_entry)
fc66f95c 3678 goto out_ip6_dst_entries;
d8d1f30b 3679 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3680 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3681 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3682 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3683 ip6_template_metrics, true);
8ed67789
DL		 3684
3685#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3686 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3687 sizeof(*net->ipv6.ip6_prohibit_entry),
3688 GFP_KERNEL);
68fffc67
PZ		 3689 if (!net->ipv6.ip6_prohibit_entry)
3690 goto out_ip6_null_entry;
d8d1f30b 3691 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3692 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3693 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3694 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3695 ip6_template_metrics, true);
8ed67789
DL		 3696
3697 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3698 sizeof(*net->ipv6.ip6_blk_hole_entry),
3699 GFP_KERNEL);
68fffc67
PZ		 3700 if (!net->ipv6.ip6_blk_hole_entry)
3701 goto out_ip6_prohibit_entry;
d8d1f30b 3702 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3703 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3704 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3705 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3706 ip6_template_metrics, true);
8ed67789
DL		 3707#endif
3708
b339a47c
PZ		 3709 net->ipv6.sysctl.flush_delay = 0;
3710 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3711 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3712 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3713 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3714 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3715 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3716 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3717
6891a346
BT		 3718 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3719
8ed67789
DL		 3720 ret = 0;
3721out:
3722 return ret;
f2fc6a54 3723
68fffc67
PZ		 3724#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3725out_ip6_prohibit_entry:
3726 kfree(net->ipv6.ip6_prohibit_entry);
3727out_ip6_null_entry:
3728 kfree(net->ipv6.ip6_null_entry);
3729#endif
fc66f95c
ED		 3730out_ip6_dst_entries:
3731 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3732out_ip6_dst_ops:
f2fc6a54 3733 goto out;
cdb18761
DL		 3734}
3735
2c8c1e72 3736static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3737{
8ed67789
DL		 3738 kfree(net->ipv6.ip6_null_entry);
3739#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3740 kfree(net->ipv6.ip6_prohibit_entry);
3741 kfree(net->ipv6.ip6_blk_hole_entry);
3742#endif
41bb78b4 3743 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3744}
3745
d189634e
TG		 3746static int __net_init ip6_route_net_init_late(struct net *net)
3747{
3748#ifdef CONFIG_PROC_FS
d4beaa66
G		 3749 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3750 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3751#endif
3752 return 0;
3753}
3754
3755static void __net_exit ip6_route_net_exit_late(struct net *net)
3756{
3757#ifdef CONFIG_PROC_FS
ece31ffd
G		 3758 remove_proc_entry("ipv6_route", net->proc_net);
3759 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3760#endif
3761}
3762
cdb18761
DL		 3763static struct pernet_operations ip6_route_net_ops = {
3764 .init = ip6_route_net_init,
3765 .exit = ip6_route_net_exit,
3766};
3767
c3426b47
DM		 3768static int __net_init ipv6_inetpeer_init(struct net *net)
3769{
3770 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3771
3772 if (!bp)
3773 return -ENOMEM;
3774 inet_peer_base_init(bp);
3775 net->ipv6.peers = bp;
3776 return 0;
3777}
3778
3779static void __net_exit ipv6_inetpeer_exit(struct net *net)
3780{
3781 struct inet_peer_base *bp = net->ipv6.peers;
3782
3783 net->ipv6.peers = NULL;
56a6b248 3784 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3785 kfree(bp);
3786}
3787
2b823f72 3788static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3789 .init = ipv6_inetpeer_init,
3790 .exit = ipv6_inetpeer_exit,
3791};
3792
d189634e
TG		 3793static struct pernet_operations ip6_route_net_late_ops = {
3794 .init = ip6_route_net_init_late,
3795 .exit = ip6_route_net_exit_late,
3796};
3797
8ed67789
DL		 3798static struct notifier_block ip6_route_dev_notifier = {
3799 .notifier_call = ip6_route_dev_notify,
3800 .priority = 0,
3801};
3802
433d49c3 3803int __init ip6_route_init(void)
1da177e4 3804{
433d49c3 3805 int ret;
8d0b94af 3806 int cpu;
433d49c3 3807
9a7ec3a9
DL		 3808 ret = -ENOMEM;
3809 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3810 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3811 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3812 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3813 goto out;
14e50e57 3814
fc66f95c 3815 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3816 if (ret)
bdb3289f 3817 goto out_kmem_cache;
bdb3289f 3818
c3426b47
DM		 3819 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3820 if (ret)
e8803b6c 3821 goto out_dst_entries;
2a0c451a 3822
7e52b33b
DM		 3823 ret = register_pernet_subsys(&ip6_route_net_ops);
3824 if (ret)
3825 goto out_register_inetpeer;
c3426b47 3826
5dc121e9
AE		 3827 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3828
8ed67789
DL		 3829 /* Registering of the loopback is done before this portion of code,
3830 * the loopback reference in rt6_info will not be taken, do it
3831 * manually for init_net */
d8d1f30b 3832 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3833 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3834 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3835 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3836 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3837 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3838 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3839 #endif
e8803b6c 3840 ret = fib6_init();
433d49c3 3841 if (ret)
8ed67789 3842 goto out_register_subsys;
433d49c3 3843
433d49c3
DL		 3844 ret = xfrm6_init();
3845 if (ret)
e8803b6c 3846 goto out_fib6_init;
c35b7e72 3847
433d49c3
DL		 3848 ret = fib6_rules_init();
3849 if (ret)
3850 goto xfrm6_init;
7e5449c2 3851
d189634e
TG		 3852 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3853 if (ret)
3854 goto fib6_rules_init;
3855
433d49c3 3856 ret = -ENOBUFS;
c7ac8679
GR		 3857 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3858 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3859 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3860 goto out_register_late_subsys;
c127ea2c 3861
8ed67789 3862 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3863 if (ret)
d189634e 3864 goto out_register_late_subsys;
8ed67789 3865
8d0b94af
MKL		 3866 for_each_possible_cpu(cpu) {
3867 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3868
3869 INIT_LIST_HEAD(&ul->head);
3870 spin_lock_init(&ul->lock);
3871 }
3872
433d49c3
DL		 3873out:
3874 return ret;
3875
d189634e
TG		 3876out_register_late_subsys:
3877 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3878fib6_rules_init:
433d49c3
DL		 3879 fib6_rules_cleanup();
3880xfrm6_init:
433d49c3 3881 xfrm6_fini();
2a0c451a
TG		 3882out_fib6_init:
3883 fib6_gc_cleanup();
8ed67789
DL		 3884out_register_subsys:
3885 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3886out_register_inetpeer:
3887 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3888out_dst_entries:
3889 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3890out_kmem_cache:
f2fc6a54 3891 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3892 goto out;
1da177e4
LT		 3893}
3894
3895void ip6_route_cleanup(void)
3896{
8ed67789 3897 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3898 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3899 fib6_rules_cleanup();
1da177e4 3900 xfrm6_fini();
1da177e4 3901 fib6_gc_cleanup();
c3426b47 3902 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3903 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3904 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3905 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3906}
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