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Merge branch 'gre-teb'
[deliverable/linux.git] / net / ipv6 / route.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1da177e4
LT		 8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14/* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
c0bece9f
YH		 23 * Ville Nuorvala
24 * Fixed routing subtrees.
1da177e4
LT		 25 */
26
f3213831
JP		 27#define pr_fmt(fmt) "IPv6: " fmt
28
4fc268d2 29#include <linux/capability.h>
1da177e4 30#include <linux/errno.h>
bc3b2d7f 31#include <linux/export.h>
1da177e4
LT		 32#include <linux/types.h>
33#include <linux/times.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/net.h>
37#include <linux/route.h>
38#include <linux/netdevice.h>
39#include <linux/in6.h>
7bc570c8 40#include <linux/mroute6.h>
1da177e4 41#include <linux/init.h>
1da177e4 42#include <linux/if_arp.h>
1da177e4
LT		 43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
5b7c931d 45#include <linux/nsproxy.h>
5a0e3ad6 46#include <linux/slab.h>
457c4cbc 47#include <net/net_namespace.h>
1da177e4
LT		 48#include <net/snmp.h>
49#include <net/ipv6.h>
50#include <net/ip6_fib.h>
51#include <net/ip6_route.h>
52#include <net/ndisc.h>
53#include <net/addrconf.h>
54#include <net/tcp.h>
55#include <linux/rtnetlink.h>
56#include <net/dst.h>
904af04d 57#include <net/dst_metadata.h>
1da177e4 58#include <net/xfrm.h>
8d71740c 59#include <net/netevent.h>
21713ebc 60#include <net/netlink.h>
51ebd318 61#include <net/nexthop.h>
19e42e45 62#include <net/lwtunnel.h>
904af04d 63#include <net/ip_tunnels.h>
ca254490 64#include <net/l3mdev.h>
b811580d 65#include <trace/events/fib6.h>
1da177e4
LT		 66
67#include <asm/uaccess.h>
68
69#ifdef CONFIG_SYSCTL
70#include <linux/sysctl.h>
71#endif
72
afc154e9 73enum rt6_nud_state {
7e980569
JB		 74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 77 RT6_NUD_SUCCEED = 1
78};
79
83a09abd 80static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
1da177e4 81static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 82static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 83static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 84static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85static void ip6_dst_destroy(struct dst_entry *);
86static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
569d3645 88static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 89
90static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 91static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 92static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 93static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 94static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 95static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
4b32b5ad 99static void rt6_dst_from_metrics_check(struct rt6_info *rt);
52bd4c0c 100static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 101
70ceb4f5 102#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 103static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex,
95c96174 106 unsigned int pref);
efa2cea0 107static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 108 const struct in6_addr *prefix, int prefixlen,
109 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 110#endif
111
8d0b94af
MKL		 112struct uncached_list {
113 spinlock_t lock;
114 struct list_head head;
115};
116
117static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118
119static void rt6_uncached_list_add(struct rt6_info *rt)
120{
121 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122
123 rt->dst.flags |= DST_NOCACHE;
124 rt->rt6i_uncached_list = ul;
125
126 spin_lock_bh(&ul->lock);
127 list_add_tail(&rt->rt6i_uncached, &ul->head);
128 spin_unlock_bh(&ul->lock);
129}
130
131static void rt6_uncached_list_del(struct rt6_info *rt)
132{
133 if (!list_empty(&rt->rt6i_uncached)) {
134 struct uncached_list *ul = rt->rt6i_uncached_list;
135
136 spin_lock_bh(&ul->lock);
137 list_del(&rt->rt6i_uncached);
138 spin_unlock_bh(&ul->lock);
139 }
140}
141
142static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143{
144 struct net_device *loopback_dev = net->loopback_dev;
145 int cpu;
146
e332bc67
EB		 147 if (dev == loopback_dev)
148 return;
149
8d0b94af
MKL		 150 for_each_possible_cpu(cpu) {
151 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 struct rt6_info *rt;
153
154 spin_lock_bh(&ul->lock);
155 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
156 struct inet6_dev *rt_idev = rt->rt6i_idev;
157 struct net_device *rt_dev = rt->dst.dev;
158
e332bc67 159 if (rt_idev->dev == dev) {
8d0b94af
MKL		 160 rt->rt6i_idev = in6_dev_get(loopback_dev);
161 in6_dev_put(rt_idev);
162 }
163
e332bc67 164 if (rt_dev == dev) {
8d0b94af
MKL		 165 rt->dst.dev = loopback_dev;
166 dev_hold(rt->dst.dev);
167 dev_put(rt_dev);
168 }
169 }
170 spin_unlock_bh(&ul->lock);
171 }
172}
173
d52d3997
MKL		 174static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175{
176 return dst_metrics_write_ptr(rt->dst.from);
177}
178
06582540
DM		 179static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180{
4b32b5ad 181 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 182
d52d3997
MKL		 183 if (rt->rt6i_flags & RTF_PCPU)
184 return rt6_pcpu_cow_metrics(rt);
185 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 186 return NULL;
187 else
3b471175 188 return dst_cow_metrics_generic(dst, old);
06582540
DM		 189}
190
f894cbf8
DM		 191static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct sk_buff *skb,
193 const void *daddr)
39232973
DM		 194{
195 struct in6_addr *p = &rt->rt6i_gateway;
196
a7563f34 197 if (!ipv6_addr_any(p))
39232973 198 return (const void *) p;
f894cbf8
DM		 199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
39232973
DM		 201 return daddr;
202}
203
f894cbf8
DM		 204static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct sk_buff *skb,
206 const void *daddr)
d3aaeb38 207{
39232973
DM		 208 struct rt6_info *rt = (struct rt6_info *) dst;
209 struct neighbour *n;
210
f894cbf8 211 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 212 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 213 if (n)
214 return n;
215 return neigh_create(&nd_tbl, daddr, dst->dev);
216}
217
9a7ec3a9 218static struct dst_ops ip6_dst_ops_template = {
1da177e4 219 .family = AF_INET6,
1da177e4
LT		 220 .gc = ip6_dst_gc,
221 .gc_thresh = 1024,
222 .check = ip6_dst_check,
0dbaee3b 223 .default_advmss = ip6_default_advmss,
ebb762f2 224 .mtu = ip6_mtu,
06582540 225 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 226 .destroy = ip6_dst_destroy,
227 .ifdown = ip6_dst_ifdown,
228 .negative_advice = ip6_negative_advice,
229 .link_failure = ip6_link_failure,
230 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 231 .redirect = rt6_do_redirect,
9f8955cc 232 .local_out = __ip6_local_out,
d3aaeb38 233 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 234};
235
ebb762f2 236static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 237{
618f9bc7
SK		 238 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239
240 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 241}
242
6700c270
DM		 243static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 245{
246}
247
6700c270
DM		 248static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
249 struct sk_buff *skb)
b587ee3b
DM		 250{
251}
252
14e50e57
DM		 253static struct dst_ops ip6_dst_blackhole_ops = {
254 .family = AF_INET6,
14e50e57
DM		 255 .destroy = ip6_dst_destroy,
256 .check = ip6_dst_check,
ebb762f2 257 .mtu = ip6_blackhole_mtu,
214f45c9 258 .default_advmss = ip6_default_advmss,
14e50e57 259 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 260 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 261 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 262 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 263};
264
62fa8a84 265static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 266 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 267};
268
fb0af4c7 269static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 270 .dst = {
271 .__refcnt = ATOMIC_INIT(1),
272 .__use = 1,
2c20cbd7 273 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 274 .error = -ENETUNREACH,
d8d1f30b
CG		 275 .input = ip6_pkt_discard,
276 .output = ip6_pkt_discard_out,
1da177e4
LT		 277 },
278 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 279 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 280 .rt6i_metric = ~(u32) 0,
281 .rt6i_ref = ATOMIC_INIT(1),
282};
283
101367c2
TG		 284#ifdef CONFIG_IPV6_MULTIPLE_TABLES
285
fb0af4c7 286static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
2c20cbd7 290 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 291 .error = -EACCES,
d8d1f30b
CG		 292 .input = ip6_pkt_prohibit,
293 .output = ip6_pkt_prohibit_out,
101367c2
TG		 294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 296 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299};
300
fb0af4c7 301static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
2c20cbd7 305 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 306 .error = -EINVAL,
d8d1f30b 307 .input = dst_discard,
ede2059d 308 .output = dst_discard_out,
101367c2
TG		 309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 311 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 312 .rt6i_metric = ~(u32) 0,
313 .rt6i_ref = ATOMIC_INIT(1),
314};
315
316#endif
317
ebfa45f0
MKL		 318static void rt6_info_init(struct rt6_info *rt)
319{
320 struct dst_entry *dst = &rt->dst;
321
322 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
323 INIT_LIST_HEAD(&rt->rt6i_siblings);
324 INIT_LIST_HEAD(&rt->rt6i_uncached);
325}
326
1da177e4 327/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 328static struct rt6_info *__ip6_dst_alloc(struct net *net,
329 struct net_device *dev,
ad706862 330 int flags)
1da177e4 331{
97bab73f 332 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 333 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 334
ebfa45f0
MKL		 335 if (rt)
336 rt6_info_init(rt);
8104891b 337
cf911662 338 return rt;
1da177e4
LT		 339}
340
9ab179d8
DA		 341struct rt6_info *ip6_dst_alloc(struct net *net,
342 struct net_device *dev,
343 int flags)
d52d3997 344{
ad706862 345 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 346
347 if (rt) {
348 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
349 if (rt->rt6i_pcpu) {
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 struct rt6_info **p;
354
355 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
356 /* no one shares rt */
357 *p = NULL;
358 }
359 } else {
360 dst_destroy((struct dst_entry *)rt);
361 return NULL;
362 }
363 }
364
365 return rt;
366}
9ab179d8 367EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 368
1da177e4
LT		 369static void ip6_dst_destroy(struct dst_entry *dst)
370{
371 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 372 struct dst_entry *from = dst->from;
8d0b94af 373 struct inet6_dev *idev;
1da177e4 374
4b32b5ad 375 dst_destroy_metrics_generic(dst);
87775312 376 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 377 rt6_uncached_list_del(rt);
378
379 idev = rt->rt6i_idev;
38308473 380 if (idev) {
1da177e4
LT		 381 rt->rt6i_idev = NULL;
382 in6_dev_put(idev);
1ab1457c 383 }
1716a961 384
ecd98837
YH		 385 dst->from = NULL;
386 dst_release(from);
b3419363
DM		 387}
388
1da177e4
LT		 389static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
390 int how)
391{
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 394 struct net_device *loopback_dev =
c346dca1 395 dev_net(dev)->loopback_dev;
1da177e4 396
97cac082
DM		 397 if (dev != loopback_dev) {
398 if (idev && idev->dev == dev) {
399 struct inet6_dev *loopback_idev =
400 in6_dev_get(loopback_dev);
401 if (loopback_idev) {
402 rt->rt6i_idev = loopback_idev;
403 in6_dev_put(idev);
404 }
405 }
1da177e4
LT		 406 }
407}
408
5973fb1e
MKL		 409static bool __rt6_check_expired(const struct rt6_info *rt)
410{
411 if (rt->rt6i_flags & RTF_EXPIRES)
412 return time_after(jiffies, rt->dst.expires);
413 else
414 return false;
415}
416
a50feda5 417static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 418{
1716a961
G		 419 if (rt->rt6i_flags & RTF_EXPIRES) {
420 if (time_after(jiffies, rt->dst.expires))
a50feda5 421 return true;
1716a961 422 } else if (rt->dst.from) {
3fd91fb3 423 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 424 }
a50feda5 425 return false;
1da177e4
LT		 426}
427
51ebd318
ND		 428/* Multipath route selection:
429 * Hash based function using packet header and flowlabel.
430 * Adapted from fib_info_hashfn()
431 */
432static int rt6_info_hash_nhsfn(unsigned int candidate_count,
433 const struct flowi6 *fl6)
434{
644d0e65 435 return get_hash_from_flowi6(fl6) % candidate_count;
51ebd318
ND		 436}
437
438static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 439 struct flowi6 *fl6, int oif,
440 int strict)
51ebd318
ND		 441{
442 struct rt6_info *sibling, *next_sibling;
443 int route_choosen;
444
445 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
446 /* Don't change the route, if route_choosen == 0
447 * (siblings does not include ourself)
448 */
449 if (route_choosen)
450 list_for_each_entry_safe(sibling, next_sibling,
451 &match->rt6i_siblings, rt6i_siblings) {
452 route_choosen--;
453 if (route_choosen == 0) {
52bd4c0c
ND		 454 if (rt6_score_route(sibling, oif, strict) < 0)
455 break;
51ebd318
ND		 456 match = sibling;
457 break;
458 }
459 }
460 return match;
461}
462
1da177e4 463/*
c71099ac 464 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 465 */
466
8ed67789
DL		 467static inline struct rt6_info *rt6_device_match(struct net *net,
468 struct rt6_info *rt,
b71d1d42 469 const struct in6_addr *saddr,
1da177e4 470 int oif,
d420895e 471 int flags)
1da177e4
LT		 472{
473 struct rt6_info *local = NULL;
474 struct rt6_info *sprt;
475
dd3abc4e
YH		 476 if (!oif && ipv6_addr_any(saddr))
477 goto out;
478
d8d1f30b 479 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 480 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 481
482 if (oif) {
1da177e4
LT		 483 if (dev->ifindex == oif)
484 return sprt;
485 if (dev->flags & IFF_LOOPBACK) {
38308473 486 if (!sprt->rt6i_idev ||
1da177e4 487 sprt->rt6i_idev->dev->ifindex != oif) {
17fb0b2b 488 if (flags & RT6_LOOKUP_F_IFACE)
1da177e4 489 continue;
17fb0b2b
DA		 490 if (local &&
491 local->rt6i_idev->dev->ifindex == oif)
1da177e4
LT		 492 continue;
493 }
494 local = sprt;
495 }
dd3abc4e
YH		 496 } else {
497 if (ipv6_chk_addr(net, saddr, dev,
498 flags & RT6_LOOKUP_F_IFACE))
499 return sprt;
1da177e4 500 }
dd3abc4e 501 }
1da177e4 502
dd3abc4e 503 if (oif) {
1da177e4
LT		 504 if (local)
505 return local;
506
d420895e 507 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 508 return net->ipv6.ip6_null_entry;
1da177e4 509 }
dd3abc4e 510out:
1da177e4
LT		 511 return rt;
512}
513
27097255 514#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 515struct __rt6_probe_work {
516 struct work_struct work;
517 struct in6_addr target;
518 struct net_device *dev;
519};
520
521static void rt6_probe_deferred(struct work_struct *w)
522{
523 struct in6_addr mcaddr;
524 struct __rt6_probe_work *work =
525 container_of(w, struct __rt6_probe_work, work);
526
527 addrconf_addr_solict_mult(&work->target, &mcaddr);
304d888b 528 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
c2f17e82 529 dev_put(work->dev);
662f5533 530 kfree(work);
c2f17e82
HFS		 531}
532
27097255
YH		 533static void rt6_probe(struct rt6_info *rt)
534{
990edb42 535 struct __rt6_probe_work *work;
f2c31e32 536 struct neighbour *neigh;
27097255
YH		 537 /*
538 * Okay, this does not seem to be appropriate
539 * for now, however, we need to check if it
540 * is really so; aka Router Reachability Probing.
541 *
542 * Router Reachability Probe MUST be rate-limited
543 * to no more than one per minute.
544 */
2152caea 545 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 546 return;
2152caea
YH		 547 rcu_read_lock_bh();
548 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
549 if (neigh) {
8d6c31bf
MKL		 550 if (neigh->nud_state & NUD_VALID)
551 goto out;
552
990edb42 553 work = NULL;
2152caea 554 write_lock(&neigh->lock);
990edb42
MKL		 555 if (!(neigh->nud_state & NUD_VALID) &&
556 time_after(jiffies,
557 neigh->updated +
558 rt->rt6i_idev->cnf.rtr_probe_interval)) {
559 work = kmalloc(sizeof(*work), GFP_ATOMIC);
560 if (work)
561 __neigh_set_probe_once(neigh);
c2f17e82 562 }
2152caea 563 write_unlock(&neigh->lock);
990edb42
MKL		 564 } else {
565 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 566 }
990edb42
MKL		 567
568 if (work) {
569 INIT_WORK(&work->work, rt6_probe_deferred);
570 work->target = rt->rt6i_gateway;
571 dev_hold(rt->dst.dev);
572 work->dev = rt->dst.dev;
573 schedule_work(&work->work);
574 }
575
8d6c31bf 576out:
2152caea 577 rcu_read_unlock_bh();
27097255
YH		 578}
579#else
580static inline void rt6_probe(struct rt6_info *rt)
581{
27097255
YH		 582}
583#endif
584
1da177e4 585/*
554cfb7e 586 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 587 */
b6f99a21 588static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 589{
d1918542 590 struct net_device *dev = rt->dst.dev;
161980f4 591 if (!oif || dev->ifindex == oif)
554cfb7e 592 return 2;
161980f4
DM		 593 if ((dev->flags & IFF_LOOPBACK) &&
594 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
595 return 1;
596 return 0;
554cfb7e 597}
1da177e4 598
afc154e9 599static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 600{
f2c31e32 601 struct neighbour *neigh;
afc154e9 602 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 603
4d0c5911
YH		 604 if (rt->rt6i_flags & RTF_NONEXTHOP ||
605 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 606 return RT6_NUD_SUCCEED;
145a3621
YH		 607
608 rcu_read_lock_bh();
609 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
610 if (neigh) {
611 read_lock(&neigh->lock);
554cfb7e 612 if (neigh->nud_state & NUD_VALID)
afc154e9 613 ret = RT6_NUD_SUCCEED;
398bcbeb 614#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 615 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 616 ret = RT6_NUD_SUCCEED;
7e980569
JB		 617 else
618 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 619#endif
145a3621 620 read_unlock(&neigh->lock);
afc154e9
HFS		 621 } else {
622 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 623 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 624 }
145a3621
YH		 625 rcu_read_unlock_bh();
626
a5a81f0b 627 return ret;
1da177e4
LT		 628}
629
554cfb7e
YH		 630static int rt6_score_route(struct rt6_info *rt, int oif,
631 int strict)
1da177e4 632{
a5a81f0b 633 int m;
1ab1457c 634
4d0c5911 635 m = rt6_check_dev(rt, oif);
77d16f45 636 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 637 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 638#ifdef CONFIG_IPV6_ROUTER_PREF
639 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
640#endif
afc154e9
HFS		 641 if (strict & RT6_LOOKUP_F_REACHABLE) {
642 int n = rt6_check_neigh(rt);
643 if (n < 0)
644 return n;
645 }
554cfb7e
YH		 646 return m;
647}
648
f11e6659 649static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 650 int *mpri, struct rt6_info *match,
651 bool *do_rr)
554cfb7e 652{
f11e6659 653 int m;
afc154e9 654 bool match_do_rr = false;
35103d11
AG		 655 struct inet6_dev *idev = rt->rt6i_idev;
656 struct net_device *dev = rt->dst.dev;
657
658 if (dev && !netif_carrier_ok(dev) &&
659 idev->cnf.ignore_routes_with_linkdown)
660 goto out;
f11e6659
DM		 661
662 if (rt6_check_expired(rt))
663 goto out;
664
665 m = rt6_score_route(rt, oif, strict);
7e980569 666 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 667 match_do_rr = true;
668 m = 0; /* lowest valid score */
7e980569 669 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 670 goto out;
afc154e9
HFS		 671 }
672
673 if (strict & RT6_LOOKUP_F_REACHABLE)
674 rt6_probe(rt);
f11e6659 675
7e980569 676 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 677 if (m > *mpri) {
afc154e9 678 *do_rr = match_do_rr;
f11e6659
DM		 679 *mpri = m;
680 match = rt;
f11e6659 681 }
f11e6659
DM		 682out:
683 return match;
684}
685
686static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
687 struct rt6_info *rr_head,
afc154e9
HFS		 688 u32 metric, int oif, int strict,
689 bool *do_rr)
f11e6659 690{
9fbdcfaf 691 struct rt6_info *rt, *match, *cont;
554cfb7e 692 int mpri = -1;
1da177e4 693
f11e6659 694 match = NULL;
9fbdcfaf
SK		 695 cont = NULL;
696 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
697 if (rt->rt6i_metric != metric) {
698 cont = rt;
699 break;
700 }
701
702 match = find_match(rt, oif, strict, &mpri, match, do_rr);
703 }
704
705 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
706 if (rt->rt6i_metric != metric) {
707 cont = rt;
708 break;
709 }
710
afc154e9 711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 712 }
713
714 if (match || !cont)
715 return match;
716
717 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 719
f11e6659
DM		 720 return match;
721}
1da177e4 722
f11e6659
DM		 723static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
724{
725 struct rt6_info *match, *rt0;
8ed67789 726 struct net *net;
afc154e9 727 bool do_rr = false;
1da177e4 728
f11e6659
DM		 729 rt0 = fn->rr_ptr;
730 if (!rt0)
731 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 732
afc154e9
HFS		 733 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 &do_rr);
1da177e4 735
afc154e9 736 if (do_rr) {
d8d1f30b 737 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 738
554cfb7e 739 /* no entries matched; do round-robin */
f11e6659
DM		 740 if (!next || next->rt6i_metric != rt0->rt6i_metric)
741 next = fn->leaf;
742
743 if (next != rt0)
744 fn->rr_ptr = next;
1da177e4 745 }
1da177e4 746
d1918542 747 net = dev_net(rt0->dst.dev);
a02cec21 748 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 749}
750
8b9df265
MKL		 751static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
752{
753 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
754}
755
70ceb4f5
YH		 756#ifdef CONFIG_IPV6_ROUTE_INFO
757int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 758 const struct in6_addr *gwaddr)
70ceb4f5 759{
c346dca1 760 struct net *net = dev_net(dev);
70ceb4f5
YH		 761 struct route_info *rinfo = (struct route_info *) opt;
762 struct in6_addr prefix_buf, *prefix;
763 unsigned int pref;
4bed72e4 764 unsigned long lifetime;
70ceb4f5
YH		 765 struct rt6_info *rt;
766
767 if (len < sizeof(struct route_info)) {
768 return -EINVAL;
769 }
770
771 /* Sanity check for prefix_len and length */
772 if (rinfo->length > 3) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 128) {
775 return -EINVAL;
776 } else if (rinfo->prefix_len > 64) {
777 if (rinfo->length < 2) {
778 return -EINVAL;
779 }
780 } else if (rinfo->prefix_len > 0) {
781 if (rinfo->length < 1) {
782 return -EINVAL;
783 }
784 }
785
786 pref = rinfo->route_pref;
787 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 788 return -EINVAL;
70ceb4f5 789
4bed72e4 790 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 791
792 if (rinfo->length == 3)
793 prefix = (struct in6_addr *)rinfo->prefix;
794 else {
795 /* this function is safe */
796 ipv6_addr_prefix(&prefix_buf,
797 (struct in6_addr *)rinfo->prefix,
798 rinfo->prefix_len);
799 prefix = &prefix_buf;
800 }
801
f104a567
DJ		 802 if (rinfo->prefix_len == 0)
803 rt = rt6_get_dflt_router(gwaddr, dev);
804 else
805 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
806 gwaddr, dev->ifindex);
70ceb4f5
YH		 807
808 if (rt && !lifetime) {
e0a1ad73 809 ip6_del_rt(rt);
70ceb4f5
YH		 810 rt = NULL;
811 }
812
813 if (!rt && lifetime)
efa2cea0 814 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 815 pref);
816 else if (rt)
817 rt->rt6i_flags = RTF_ROUTEINFO |
818 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
819
820 if (rt) {
1716a961
G		 821 if (!addrconf_finite_timeout(lifetime))
822 rt6_clean_expires(rt);
823 else
824 rt6_set_expires(rt, jiffies + HZ * lifetime);
825
94e187c0 826 ip6_rt_put(rt);
70ceb4f5
YH		 827 }
828 return 0;
829}
830#endif
831
a3c00e46
MKL		 832static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
833 struct in6_addr *saddr)
834{
835 struct fib6_node *pn;
836 while (1) {
837 if (fn->fn_flags & RTN_TL_ROOT)
838 return NULL;
839 pn = fn->parent;
840 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
841 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
842 else
843 fn = pn;
844 if (fn->fn_flags & RTN_RTINFO)
845 return fn;
846 }
847}
c71099ac 848
8ed67789
DL		 849static struct rt6_info *ip6_pol_route_lookup(struct net *net,
850 struct fib6_table *table,
4c9483b2 851 struct flowi6 *fl6, int flags)
1da177e4
LT		 852{
853 struct fib6_node *fn;
854 struct rt6_info *rt;
855
c71099ac 856 read_lock_bh(&table->tb6_lock);
4c9483b2 857 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 858restart:
859 rt = fn->leaf;
4c9483b2 860 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 861 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 862 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 863 if (rt == net->ipv6.ip6_null_entry) {
864 fn = fib6_backtrack(fn, &fl6->saddr);
865 if (fn)
866 goto restart;
867 }
d8d1f30b 868 dst_use(&rt->dst, jiffies);
c71099ac 869 read_unlock_bh(&table->tb6_lock);
b811580d
DA		 870
871 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
872
c71099ac
TG		 873 return rt;
874
875}
876
67ba4152 877struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 878 int flags)
879{
880 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
881}
882EXPORT_SYMBOL_GPL(ip6_route_lookup);
883
9acd9f3a
YH		 884struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
885 const struct in6_addr *saddr, int oif, int strict)
c71099ac 886{
4c9483b2
DM		 887 struct flowi6 fl6 = {
888 .flowi6_oif = oif,
889 .daddr = *daddr,
c71099ac
TG		 890 };
891 struct dst_entry *dst;
77d16f45 892 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 893
adaa70bb 894 if (saddr) {
4c9483b2 895 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 896 flags |= RT6_LOOKUP_F_HAS_SADDR;
897 }
898
4c9483b2 899 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 900 if (dst->error == 0)
901 return (struct rt6_info *) dst;
902
903 dst_release(dst);
904
1da177e4
LT		 905 return NULL;
906}
7159039a
YH		 907EXPORT_SYMBOL(rt6_lookup);
908
c71099ac 909/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 910 It takes new route entry, the addition fails by any reason the
911 route is freed. In any case, if caller does not hold it, it may
912 be destroyed.
913 */
914
e5fd387a 915static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 916 struct mx6_config *mxc)
1da177e4
LT		 917{
918 int err;
c71099ac 919 struct fib6_table *table;
1da177e4 920
c71099ac
TG		 921 table = rt->rt6i_table;
922 write_lock_bh(&table->tb6_lock);
e715b6d3 923 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 924 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 925
926 return err;
927}
928
40e22e8f
TG		 929int ip6_ins_rt(struct rt6_info *rt)
930{
e715b6d3
FW		 931 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
932 struct mx6_config mxc = { .mx = NULL, };
933
934 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 935}
936
8b9df265
MKL		 937static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
938 const struct in6_addr *daddr,
939 const struct in6_addr *saddr)
1da177e4 940{
1da177e4
LT		 941 struct rt6_info *rt;
942
943 /*
944 * Clone the route.
945 */
946
d52d3997 947 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 948 ort = (struct rt6_info *)ort->dst.from;
1da177e4 949
ad706862 950 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 951
952 if (!rt)
953 return NULL;
954
955 ip6_rt_copy_init(rt, ort);
956 rt->rt6i_flags |= RTF_CACHE;
957 rt->rt6i_metric = 0;
958 rt->dst.flags |= DST_HOST;
959 rt->rt6i_dst.addr = *daddr;
960 rt->rt6i_dst.plen = 128;
1da177e4 961
83a09abd
MKL		 962 if (!rt6_is_gw_or_nonexthop(ort)) {
963 if (ort->rt6i_dst.plen != 128 &&
964 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
965 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 966#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 967 if (rt->rt6i_src.plen && saddr) {
968 rt->rt6i_src.addr = *saddr;
969 rt->rt6i_src.plen = 128;
8b9df265 970 }
83a09abd 971#endif
95a9a5ba 972 }
1da177e4 973
95a9a5ba
YH		 974 return rt;
975}
1da177e4 976
d52d3997
MKL		 977static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
978{
979 struct rt6_info *pcpu_rt;
980
981 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 982 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 983
984 if (!pcpu_rt)
985 return NULL;
986 ip6_rt_copy_init(pcpu_rt, rt);
987 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
988 pcpu_rt->rt6i_flags |= RTF_PCPU;
989 return pcpu_rt;
990}
991
992/* It should be called with read_lock_bh(&tb6_lock) acquired */
993static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
994{
a73e4195 995 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 996
997 p = this_cpu_ptr(rt->rt6i_pcpu);
998 pcpu_rt = *p;
999
a73e4195
MKL		 1000 if (pcpu_rt) {
1001 dst_hold(&pcpu_rt->dst);
1002 rt6_dst_from_metrics_check(pcpu_rt);
1003 }
1004 return pcpu_rt;
1005}
1006
1007static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1008{
9c7370a1 1009 struct fib6_table *table = rt->rt6i_table;
a73e4195 1010 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1011
1012 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1013 if (!pcpu_rt) {
1014 struct net *net = dev_net(rt->dst.dev);
1015
9c7370a1
MKL		 1016 dst_hold(&net->ipv6.ip6_null_entry->dst);
1017 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1018 }
1019
9c7370a1
MKL		 1020 read_lock_bh(&table->tb6_lock);
1021 if (rt->rt6i_pcpu) {
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 prev = cmpxchg(p, NULL, pcpu_rt);
1024 if (prev) {
1025 /* If someone did it before us, return prev instead */
1026 dst_destroy(&pcpu_rt->dst);
1027 pcpu_rt = prev;
1028 }
1029 } else {
1030 /* rt has been removed from the fib6 tree
1031 * before we have a chance to acquire the read_lock.
1032 * In this case, don't brother to create a pcpu rt
1033 * since rt is going away anyway. The next
1034 * dst_check() will trigger a re-lookup.
1035 */
d52d3997 1036 dst_destroy(&pcpu_rt->dst);
9c7370a1 1037 pcpu_rt = rt;
d52d3997 1038 }
d52d3997
MKL		 1039 dst_hold(&pcpu_rt->dst);
1040 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1041 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1042 return pcpu_rt;
1043}
1044
8ed67789 1045static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
4c9483b2 1046 struct flowi6 *fl6, int flags)
1da177e4 1047{
367efcb9 1048 struct fib6_node *fn, *saved_fn;
45e4fd26 1049 struct rt6_info *rt;
c71099ac 1050 int strict = 0;
1da177e4 1051
77d16f45 1052 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1055
c71099ac 1056 read_lock_bh(&table->tb6_lock);
1da177e4 1057
4c9483b2 1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1059 saved_fn = fn;
1da177e4 1060
ca254490
DA		 1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
a3c00e46 1064redo_rt6_select:
367efcb9 1065 rt = rt6_select(fn, oif, strict);
52bd4c0c 1066 if (rt->rt6i_nsiblings)
367efcb9 1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
367efcb9
MKL		 1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
367efcb9 1077 }
a3c00e46
MKL		 1078 }
1079
fb9de91e 1080
3da59bd9 1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
b811580d
DA		 1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
d52d3997 1088 return rt;
3da59bd9
MKL		 1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
d52d3997
MKL		 1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
3da59bd9
MKL		 1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
c71099ac 1104
3da59bd9 1105 if (uncached_rt)
8d0b94af 1106 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1109
3da59bd9 1110 dst_hold(&uncached_rt->dst);
b811580d
DA		 1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
3da59bd9 1113 return uncached_rt;
3da59bd9 1114
d52d3997
MKL		 1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1123
9c7370a1
MKL		 1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
a73e4195 1133 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1134 dst_release(&rt->dst);
1135 }
d52d3997 1136
b811580d 1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
d52d3997 1138 return pcpu_rt;
9c7370a1 1139
d52d3997 1140 }
1da177e4
LT		 1141}
1142
8ed67789 1143static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1144 struct flowi6 *fl6, int flags)
4acad72d 1145{
4c9483b2 1146 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1147}
1148
72331bc0
SL		 1149static struct dst_entry *ip6_route_input_lookup(struct net *net,
1150 struct net_device *dev,
1151 struct flowi6 *fl6, int flags)
1152{
1153 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1154 flags |= RT6_LOOKUP_F_IFACE;
1155
1156 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1157}
1158
c71099ac
TG		 1159void ip6_route_input(struct sk_buff *skb)
1160{
b71d1d42 1161 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1162 struct net *net = dev_net(skb->dev);
adaa70bb 1163 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1164 struct ip_tunnel_info *tun_info;
4c9483b2 1165 struct flowi6 fl6 = {
ca254490 1166 .flowi6_iif = l3mdev_fib_oif(skb->dev),
4c9483b2
DM		 1167 .daddr = iph->daddr,
1168 .saddr = iph->saddr,
6502ca52 1169 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1170 .flowi6_mark = skb->mark,
1171 .flowi6_proto = iph->nexthdr,
c71099ac 1172 };
adaa70bb 1173
904af04d 1174 tun_info = skb_tunnel_info(skb);
46fa062a 1175 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1176 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1177 skb_dst_drop(skb);
72331bc0 1178 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1179}
1180
8ed67789 1181static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1182 struct flowi6 *fl6, int flags)
1da177e4 1183{
4c9483b2 1184 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1185}
1186
6f21c96a
PA		 1187struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1188 struct flowi6 *fl6, int flags)
c71099ac 1189{
ca254490 1190 struct dst_entry *dst;
d46a9d67 1191 bool any_src;
c71099ac 1192
ca254490
DA		 1193 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1194 if (dst)
1195 return dst;
1196
1fb9489b 1197 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1198
d46a9d67 1199 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1200 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1201 (fl6->flowi6_oif && any_src))
77d16f45 1202 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1203
d46a9d67 1204 if (!any_src)
adaa70bb 1205 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1206 else if (sk)
1207 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1208
4c9483b2 1209 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1210}
6f21c96a 1211EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 1212
2774c131 1213struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1214{
5c1e6aa3 1215 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1216 struct dst_entry *new = NULL;
1217
f5b0a874 1218 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1219 if (rt) {
0a1f5962 1220 rt6_info_init(rt);
8104891b 1221
0a1f5962 1222 new = &rt->dst;
14e50e57 1223 new->__use = 1;
352e512c 1224 new->input = dst_discard;
ede2059d 1225 new->output = dst_discard_out;
14e50e57 1226
0a1f5962 1227 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1228 rt->rt6i_idev = ort->rt6i_idev;
1229 if (rt->rt6i_idev)
1230 in6_dev_hold(rt->rt6i_idev);
14e50e57 1231
4e3fd7a0 1232 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1233 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1234 rt->rt6i_metric = 0;
1235
1236 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1237#ifdef CONFIG_IPV6_SUBTREES
1238 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1239#endif
1240
1241 dst_free(new);
1242 }
1243
69ead7af
DM		 1244 dst_release(dst_orig);
1245 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1246}
14e50e57 1247
1da177e4
LT		 1248/*
1249 * Destination cache support functions
1250 */
1251
4b32b5ad
MKL		 1252static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1253{
1254 if (rt->dst.from &&
1255 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1256 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1257}
1258
3da59bd9
MKL		 1259static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1260{
1261 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1262 return NULL;
1263
1264 if (rt6_check_expired(rt))
1265 return NULL;
1266
1267 return &rt->dst;
1268}
1269
1270static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1271{
5973fb1e
MKL		 1272 if (!__rt6_check_expired(rt) &&
1273 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
3da59bd9
MKL		 1274 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1275 return &rt->dst;
1276 else
1277 return NULL;
1278}
1279
1da177e4
LT		 1280static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1281{
1282 struct rt6_info *rt;
1283
1284 rt = (struct rt6_info *) dst;
1285
6f3118b5
ND		 1286 /* All IPV6 dsts are created with ->obsolete set to the value
1287 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1288 * into this function always.
1289 */
e3bc10bd 1290
4b32b5ad
MKL		 1291 rt6_dst_from_metrics_check(rt);
1292
02bcf4e0
MKL		 1293 if (rt->rt6i_flags & RTF_PCPU ||
1294 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
3da59bd9
MKL		 1295 return rt6_dst_from_check(rt, cookie);
1296 else
1297 return rt6_check(rt, cookie);
1da177e4
LT		 1298}
1299
1300static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1301{
1302 struct rt6_info *rt = (struct rt6_info *) dst;
1303
1304 if (rt) {
54c1a859
YH		 1305 if (rt->rt6i_flags & RTF_CACHE) {
1306 if (rt6_check_expired(rt)) {
1307 ip6_del_rt(rt);
1308 dst = NULL;
1309 }
1310 } else {
1da177e4 1311 dst_release(dst);
54c1a859
YH		 1312 dst = NULL;
1313 }
1da177e4 1314 }
54c1a859 1315 return dst;
1da177e4
LT		 1316}
1317
1318static void ip6_link_failure(struct sk_buff *skb)
1319{
1320 struct rt6_info *rt;
1321
3ffe533c 1322 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1323
adf30907 1324 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1325 if (rt) {
1eb4f758
HFS		 1326 if (rt->rt6i_flags & RTF_CACHE) {
1327 dst_hold(&rt->dst);
8e3d5be7 1328 ip6_del_rt(rt);
1eb4f758 1329 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1330 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1331 }
1da177e4
LT		 1332 }
1333}
1334
45e4fd26
MKL		 1335static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1336{
1337 struct net *net = dev_net(rt->dst.dev);
1338
1339 rt->rt6i_flags |= RTF_MODIFIED;
1340 rt->rt6i_pmtu = mtu;
1341 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1342}
1343
0d3f6d29
MKL		 1344static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1345{
1346 return !(rt->rt6i_flags & RTF_CACHE) &&
1347 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1348}
1349
45e4fd26
MKL		 1350static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1351 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1352{
67ba4152 1353 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1354
45e4fd26
MKL		 1355 if (rt6->rt6i_flags & RTF_LOCAL)
1356 return;
81aded24 1357
45e4fd26
MKL		 1358 dst_confirm(dst);
1359 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1360 if (mtu >= dst_mtu(dst))
1361 return;
9d289715 1362
0d3f6d29 1363 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26
MKL		 1364 rt6_do_update_pmtu(rt6, mtu);
1365 } else {
1366 const struct in6_addr *daddr, *saddr;
1367 struct rt6_info *nrt6;
1368
1369 if (iph) {
1370 daddr = &iph->daddr;
1371 saddr = &iph->saddr;
1372 } else if (sk) {
1373 daddr = &sk->sk_v6_daddr;
1374 saddr = &inet6_sk(sk)->saddr;
1375 } else {
1376 return;
1377 }
1378 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1379 if (nrt6) {
1380 rt6_do_update_pmtu(nrt6, mtu);
1381
1382 /* ip6_ins_rt(nrt6) will bump the
1383 * rt6->rt6i_node->fn_sernum
1384 * which will fail the next rt6_check() and
1385 * invalidate the sk->sk_dst_cache.
1386 */
1387 ip6_ins_rt(nrt6);
1388 }
1da177e4
LT		 1389 }
1390}
1391
45e4fd26
MKL		 1392static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1393 struct sk_buff *skb, u32 mtu)
1394{
1395 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1396}
1397
42ae66c8
DM		 1398void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1399 int oif, u32 mark)
81aded24
DM		 1400{
1401 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1402 struct dst_entry *dst;
1403 struct flowi6 fl6;
1404
1405 memset(&fl6, 0, sizeof(fl6));
1406 fl6.flowi6_oif = oif;
1b3c61dc 1407 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1408 fl6.daddr = iph->daddr;
1409 fl6.saddr = iph->saddr;
6502ca52 1410 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1411
1412 dst = ip6_route_output(net, NULL, &fl6);
1413 if (!dst->error)
45e4fd26 1414 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1415 dst_release(dst);
1416}
1417EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1418
1419void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1420{
33c162a9
MKL		 1421 struct dst_entry *dst;
1422
81aded24
DM		 1423 ip6_update_pmtu(skb, sock_net(sk), mtu,
1424 sk->sk_bound_dev_if, sk->sk_mark);
33c162a9
MKL		 1425
1426 dst = __sk_dst_get(sk);
1427 if (!dst || !dst->obsolete ||
1428 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1429 return;
1430
1431 bh_lock_sock(sk);
1432 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1433 ip6_datagram_dst_update(sk, false);
1434 bh_unlock_sock(sk);
81aded24
DM		 1435}
1436EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1437
b55b76b2
DJ		 1438/* Handle redirects */
1439struct ip6rd_flowi {
1440 struct flowi6 fl6;
1441 struct in6_addr gateway;
1442};
1443
1444static struct rt6_info *__ip6_route_redirect(struct net *net,
1445 struct fib6_table *table,
1446 struct flowi6 *fl6,
1447 int flags)
1448{
1449 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1450 struct rt6_info *rt;
1451 struct fib6_node *fn;
1452
1453 /* Get the "current" route for this destination and
1454 * check if the redirect has come from approriate router.
1455 *
1456 * RFC 4861 specifies that redirects should only be
1457 * accepted if they come from the nexthop to the target.
1458 * Due to the way the routes are chosen, this notion
1459 * is a bit fuzzy and one might need to check all possible
1460 * routes.
1461 */
1462
1463 read_lock_bh(&table->tb6_lock);
1464 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1465restart:
1466 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1467 if (rt6_check_expired(rt))
1468 continue;
1469 if (rt->dst.error)
1470 break;
1471 if (!(rt->rt6i_flags & RTF_GATEWAY))
1472 continue;
1473 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1474 continue;
1475 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1476 continue;
1477 break;
1478 }
1479
1480 if (!rt)
1481 rt = net->ipv6.ip6_null_entry;
1482 else if (rt->dst.error) {
1483 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1484 goto out;
1485 }
1486
1487 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1488 fn = fib6_backtrack(fn, &fl6->saddr);
1489 if (fn)
1490 goto restart;
b55b76b2 1491 }
a3c00e46 1492
b0a1ba59 1493out:
b55b76b2
DJ		 1494 dst_hold(&rt->dst);
1495
1496 read_unlock_bh(&table->tb6_lock);
1497
b811580d 1498 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
b55b76b2
DJ		 1499 return rt;
1500};
1501
1502static struct dst_entry *ip6_route_redirect(struct net *net,
1503 const struct flowi6 *fl6,
1504 const struct in6_addr *gateway)
1505{
1506 int flags = RT6_LOOKUP_F_HAS_SADDR;
1507 struct ip6rd_flowi rdfl;
1508
1509 rdfl.fl6 = *fl6;
1510 rdfl.gateway = *gateway;
1511
1512 return fib6_rule_lookup(net, &rdfl.fl6,
1513 flags, __ip6_route_redirect);
1514}
1515
3a5ad2ee
DM		 1516void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1517{
1518 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1519 struct dst_entry *dst;
1520 struct flowi6 fl6;
1521
1522 memset(&fl6, 0, sizeof(fl6));
e374c618 1523 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1524 fl6.flowi6_oif = oif;
1525 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1526 fl6.daddr = iph->daddr;
1527 fl6.saddr = iph->saddr;
6502ca52 1528 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1529
b55b76b2
DJ		 1530 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1531 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1532 dst_release(dst);
1533}
1534EXPORT_SYMBOL_GPL(ip6_redirect);
1535
c92a59ec
DJ		 1536void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1537 u32 mark)
1538{
1539 const struct ipv6hdr *iph = ipv6_hdr(skb);
1540 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1541 struct dst_entry *dst;
1542 struct flowi6 fl6;
1543
1544 memset(&fl6, 0, sizeof(fl6));
e374c618 1545 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1546 fl6.flowi6_oif = oif;
1547 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1548 fl6.daddr = msg->dest;
1549 fl6.saddr = iph->daddr;
1550
b55b76b2
DJ		 1551 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1552 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1553 dst_release(dst);
1554}
1555
3a5ad2ee
DM		 1556void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1557{
1558 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1559}
1560EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1561
0dbaee3b 1562static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1563{
0dbaee3b
DM		 1564 struct net_device *dev = dst->dev;
1565 unsigned int mtu = dst_mtu(dst);
1566 struct net *net = dev_net(dev);
1567
1da177e4
LT		 1568 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1569
5578689a
DL		 1570 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1571 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1572
1573 /*
1ab1457c
YH		 1574 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1575 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1576 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1577 * rely only on pmtu discovery"
1578 */
1579 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1580 mtu = IPV6_MAXPLEN;
1581 return mtu;
1582}
1583
ebb762f2 1584static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1585{
4b32b5ad
MKL		 1586 const struct rt6_info *rt = (const struct rt6_info *)dst;
1587 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1588 struct inet6_dev *idev;
618f9bc7 1589
4b32b5ad
MKL		 1590 if (mtu)
1591 goto out;
1592
1593 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1594 if (mtu)
30f78d8e 1595 goto out;
618f9bc7
SK		 1596
1597 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1598
1599 rcu_read_lock();
1600 idev = __in6_dev_get(dst->dev);
1601 if (idev)
1602 mtu = idev->cnf.mtu6;
1603 rcu_read_unlock();
1604
30f78d8e
ED		 1605out:
1606 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1607}
1608
3b00944c
YH		 1609static struct dst_entry *icmp6_dst_gc_list;
1610static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1611
3b00944c 1612struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1613 struct flowi6 *fl6)
1da177e4 1614{
87a11578 1615 struct dst_entry *dst;
1da177e4
LT		 1616 struct rt6_info *rt;
1617 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1618 struct net *net = dev_net(dev);
1da177e4 1619
38308473 1620 if (unlikely(!idev))
122bdf67 1621 return ERR_PTR(-ENODEV);
1da177e4 1622
ad706862 1623 rt = ip6_dst_alloc(net, dev, 0);
38308473 1624 if (unlikely(!rt)) {
1da177e4 1625 in6_dev_put(idev);
87a11578 1626 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1627 goto out;
1628 }
1629
8e2ec639
YZ		 1630 rt->dst.flags |= DST_HOST;
1631 rt->dst.output = ip6_output;
d8d1f30b 1632 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1633 rt->rt6i_gateway = fl6->daddr;
87a11578 1634 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1635 rt->rt6i_dst.plen = 128;
1636 rt->rt6i_idev = idev;
14edd87d 1637 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1638
3b00944c 1639 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1640 rt->dst.next = icmp6_dst_gc_list;
1641 icmp6_dst_gc_list = &rt->dst;
3b00944c 1642 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1643
5578689a 1644 fib6_force_start_gc(net);
1da177e4 1645
87a11578
DM		 1646 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1647
1da177e4 1648out:
87a11578 1649 return dst;
1da177e4
LT		 1650}
1651
3d0f24a7 1652int icmp6_dst_gc(void)
1da177e4 1653{
e9476e95 1654 struct dst_entry *dst, **pprev;
3d0f24a7 1655 int more = 0;
1da177e4 1656
3b00944c
YH		 1657 spin_lock_bh(&icmp6_dst_lock);
1658 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1659
1da177e4
LT		 1660 while ((dst = *pprev) != NULL) {
1661 if (!atomic_read(&dst->__refcnt)) {
1662 *pprev = dst->next;
1663 dst_free(dst);
1da177e4
LT		 1664 } else {
1665 pprev = &dst->next;
3d0f24a7 1666 ++more;
1da177e4
LT		 1667 }
1668 }
1669
3b00944c 1670 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1671
3d0f24a7 1672 return more;
1da177e4
LT		 1673}
1674
1e493d19
DM		 1675static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1676 void *arg)
1677{
1678 struct dst_entry *dst, **pprev;
1679
1680 spin_lock_bh(&icmp6_dst_lock);
1681 pprev = &icmp6_dst_gc_list;
1682 while ((dst = *pprev) != NULL) {
1683 struct rt6_info *rt = (struct rt6_info *) dst;
1684 if (func(rt, arg)) {
1685 *pprev = dst->next;
1686 dst_free(dst);
1687 } else {
1688 pprev = &dst->next;
1689 }
1690 }
1691 spin_unlock_bh(&icmp6_dst_lock);
1692}
1693
569d3645 1694static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1695{
86393e52 1696 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1697 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1698 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1699 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1700 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1701 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1702 int entries;
7019b78e 1703
fc66f95c 1704 entries = dst_entries_get_fast(ops);
49a18d86 1705 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1706 entries <= rt_max_size)
1da177e4
LT		 1707 goto out;
1708
6891a346 1709 net->ipv6.ip6_rt_gc_expire++;
14956643 1710 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1711 entries = dst_entries_get_slow(ops);
1712 if (entries < ops->gc_thresh)
7019b78e 1713 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1714out:
7019b78e 1715 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1716 return entries > rt_max_size;
1da177e4
LT		 1717}
1718
e715b6d3
FW		 1719static int ip6_convert_metrics(struct mx6_config *mxc,
1720 const struct fib6_config *cfg)
1721{
c3a8d947 1722 bool ecn_ca = false;
e715b6d3
FW		 1723 struct nlattr *nla;
1724 int remaining;
1725 u32 *mp;
1726
63159f29 1727 if (!cfg->fc_mx)
e715b6d3
FW		 1728 return 0;
1729
1730 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1731 if (unlikely(!mp))
1732 return -ENOMEM;
1733
1734 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1735 int type = nla_type(nla);
1bb14807 1736 u32 val;
e715b6d3 1737
1bb14807
DB		 1738 if (!type)
1739 continue;
1740 if (unlikely(type > RTAX_MAX))
1741 goto err;
ea697639 1742
1bb14807
DB		 1743 if (type == RTAX_CC_ALGO) {
1744 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1745
1bb14807 1746 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1747 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1748 if (val == TCP_CA_UNSPEC)
1749 goto err;
1750 } else {
1751 val = nla_get_u32(nla);
e715b6d3 1752 }
b8d3e416
DB		 1753 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1754 goto err;
1bb14807
DB		 1755
1756 mp[type - 1] = val;
1757 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1758 }
1759
c3a8d947
DB		 1760 if (ecn_ca) {
1761 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1762 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1763 }
e715b6d3 1764
c3a8d947 1765 mxc->mx = mp;
e715b6d3
FW		 1766 return 0;
1767 err:
1768 kfree(mp);
1769 return -EINVAL;
1770}
1da177e4 1771
8c14586f
DA		 1772static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1773 struct fib6_config *cfg,
1774 const struct in6_addr *gw_addr)
1775{
1776 struct flowi6 fl6 = {
1777 .flowi6_oif = cfg->fc_ifindex,
1778 .daddr = *gw_addr,
1779 .saddr = cfg->fc_prefsrc,
1780 };
1781 struct fib6_table *table;
1782 struct rt6_info *rt;
1783 int flags = 0;
1784
1785 table = fib6_get_table(net, cfg->fc_table);
1786 if (!table)
1787 return NULL;
1788
1789 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1790 flags |= RT6_LOOKUP_F_HAS_SADDR;
1791
1792 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1793
1794 /* if table lookup failed, fall back to full lookup */
1795 if (rt == net->ipv6.ip6_null_entry) {
1796 ip6_rt_put(rt);
1797 rt = NULL;
1798 }
1799
1800 return rt;
1801}
1802
8c5b83f0 1803static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1804{
5578689a 1805 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1806 struct rt6_info *rt = NULL;
1807 struct net_device *dev = NULL;
1808 struct inet6_dev *idev = NULL;
c71099ac 1809 struct fib6_table *table;
1da177e4 1810 int addr_type;
8c5b83f0 1811 int err = -EINVAL;
1da177e4 1812
86872cb5 1813 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1814 goto out;
1da177e4 1815#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1816 if (cfg->fc_src_len)
8c5b83f0 1817 goto out;
1da177e4 1818#endif
86872cb5 1819 if (cfg->fc_ifindex) {
1da177e4 1820 err = -ENODEV;
5578689a 1821 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1822 if (!dev)
1823 goto out;
1824 idev = in6_dev_get(dev);
1825 if (!idev)
1826 goto out;
1827 }
1828
86872cb5
TG		 1829 if (cfg->fc_metric == 0)
1830 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1831
d71314b4 1832 err = -ENOBUFS;
38308473
DM		 1833 if (cfg->fc_nlinfo.nlh &&
1834 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1835 table = fib6_get_table(net, cfg->fc_table);
38308473 1836 if (!table) {
f3213831 1837 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1838 table = fib6_new_table(net, cfg->fc_table);
1839 }
1840 } else {
1841 table = fib6_new_table(net, cfg->fc_table);
1842 }
38308473
DM		 1843
1844 if (!table)
c71099ac 1845 goto out;
c71099ac 1846
ad706862
MKL		 1847 rt = ip6_dst_alloc(net, NULL,
1848 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1849
38308473 1850 if (!rt) {
1da177e4
LT		 1851 err = -ENOMEM;
1852 goto out;
1853 }
1854
1716a961
G		 1855 if (cfg->fc_flags & RTF_EXPIRES)
1856 rt6_set_expires(rt, jiffies +
1857 clock_t_to_jiffies(cfg->fc_expires));
1858 else
1859 rt6_clean_expires(rt);
1da177e4 1860
86872cb5
TG		 1861 if (cfg->fc_protocol == RTPROT_UNSPEC)
1862 cfg->fc_protocol = RTPROT_BOOT;
1863 rt->rt6i_protocol = cfg->fc_protocol;
1864
1865 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1866
1867 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1868 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1869 else if (cfg->fc_flags & RTF_LOCAL)
1870 rt->dst.input = ip6_input;
1da177e4 1871 else
d8d1f30b 1872 rt->dst.input = ip6_forward;
1da177e4 1873
d8d1f30b 1874 rt->dst.output = ip6_output;
1da177e4 1875
19e42e45
RP		 1876 if (cfg->fc_encap) {
1877 struct lwtunnel_state *lwtstate;
1878
1879 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1880 cfg->fc_encap, AF_INET6, cfg,
1881 &lwtstate);
19e42e45
RP		 1882 if (err)
1883 goto out;
61adedf3
JB		 1884 rt->dst.lwtstate = lwtstate_get(lwtstate);
1885 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1886 rt->dst.lwtstate->orig_output = rt->dst.output;
1887 rt->dst.output = lwtunnel_output;
25368623 1888 }
61adedf3
JB		 1889 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1890 rt->dst.lwtstate->orig_input = rt->dst.input;
1891 rt->dst.input = lwtunnel_input;
25368623 1892 }
19e42e45
RP		 1893 }
1894
86872cb5
TG		 1895 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1896 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1897 if (rt->rt6i_dst.plen == 128)
e5fd387a 1898 rt->dst.flags |= DST_HOST;
e5fd387a 1899
1da177e4 1900#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1901 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1902 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1903#endif
1904
86872cb5 1905 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1906
1907 /* We cannot add true routes via loopback here,
1908 they would result in kernel looping; promote them to reject routes
1909 */
86872cb5 1910 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1911 (dev && (dev->flags & IFF_LOOPBACK) &&
1912 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1913 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1914 /* hold loopback dev/idev if we haven't done so. */
5578689a 1915 if (dev != net->loopback_dev) {
1da177e4
LT		 1916 if (dev) {
1917 dev_put(dev);
1918 in6_dev_put(idev);
1919 }
5578689a 1920 dev = net->loopback_dev;
1da177e4
LT		 1921 dev_hold(dev);
1922 idev = in6_dev_get(dev);
1923 if (!idev) {
1924 err = -ENODEV;
1925 goto out;
1926 }
1927 }
1da177e4 1928 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1929 switch (cfg->fc_type) {
1930 case RTN_BLACKHOLE:
1931 rt->dst.error = -EINVAL;
ede2059d 1932 rt->dst.output = dst_discard_out;
7150aede 1933 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1934 break;
1935 case RTN_PROHIBIT:
1936 rt->dst.error = -EACCES;
7150aede
K		 1937 rt->dst.output = ip6_pkt_prohibit_out;
1938 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1939 break;
b4949ab2 1940 case RTN_THROW:
0315e382 1941 case RTN_UNREACHABLE:
ef2c7d7b 1942 default:
7150aede 1943 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1944 : (cfg->fc_type == RTN_UNREACHABLE)
1945 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1946 rt->dst.output = ip6_pkt_discard_out;
1947 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1948 break;
1949 }
1da177e4
LT		 1950 goto install_route;
1951 }
1952
86872cb5 1953 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1954 const struct in6_addr *gw_addr;
1da177e4
LT		 1955 int gwa_type;
1956
86872cb5 1957 gw_addr = &cfg->fc_gateway;
330567b7 1958 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1959
1960 /* if gw_addr is local we will fail to detect this in case
1961 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1962 * will return already-added prefix route via interface that
1963 * prefix route was assigned to, which might be non-loopback.
1964 */
1965 err = -EINVAL;
330567b7
FW		 1966 if (ipv6_chk_addr_and_flags(net, gw_addr,
1967 gwa_type & IPV6_ADDR_LINKLOCAL ?
1968 dev : NULL, 0, 0))
48ed7b26
FW		 1969 goto out;
1970
4e3fd7a0 1971 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1972
1973 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
8c14586f 1974 struct rt6_info *grt = NULL;
1da177e4
LT		 1975
1976 /* IPv6 strictly inhibits using not link-local
1977 addresses as nexthop address.
1978 Otherwise, router will not able to send redirects.
1979 It is very good, but in some (rare!) circumstances
1980 (SIT, PtP, NBMA NOARP links) it is handy to allow
1981 some exceptions. --ANK
1982 */
38308473 1983 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1984 goto out;
1985
8c14586f
DA		 1986 if (cfg->fc_table)
1987 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1988
1989 if (!grt)
1990 grt = rt6_lookup(net, gw_addr, NULL,
1991 cfg->fc_ifindex, 1);
1da177e4
LT		 1992
1993 err = -EHOSTUNREACH;
38308473 1994 if (!grt)
1da177e4
LT		 1995 goto out;
1996 if (dev) {
d1918542 1997 if (dev != grt->dst.dev) {
94e187c0 1998 ip6_rt_put(grt);
1da177e4
LT		 1999 goto out;
2000 }
2001 } else {
d1918542 2002 dev = grt->dst.dev;
1da177e4
LT		 2003 idev = grt->rt6i_idev;
2004 dev_hold(dev);
2005 in6_dev_hold(grt->rt6i_idev);
2006 }
38308473 2007 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 2008 err = 0;
94e187c0 2009 ip6_rt_put(grt);
1da177e4
LT		 2010
2011 if (err)
2012 goto out;
2013 }
2014 err = -EINVAL;
38308473 2015 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2016 goto out;
2017 }
2018
2019 err = -ENODEV;
38308473 2020 if (!dev)
1da177e4
LT		 2021 goto out;
2022
c3968a85
DW		 2023 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2024 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2025 err = -EINVAL;
2026 goto out;
2027 }
4e3fd7a0 2028 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 2029 rt->rt6i_prefsrc.plen = 128;
2030 } else
2031 rt->rt6i_prefsrc.plen = 0;
2032
86872cb5 2033 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2034
2035install_route:
d8d1f30b 2036 rt->dst.dev = dev;
1da177e4 2037 rt->rt6i_idev = idev;
c71099ac 2038 rt->rt6i_table = table;
63152fc0 2039
c346dca1 2040 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2041
8c5b83f0 2042 return rt;
6b9ea5a6
RP		 2043out:
2044 if (dev)
2045 dev_put(dev);
2046 if (idev)
2047 in6_dev_put(idev);
2048 if (rt)
2049 dst_free(&rt->dst);
2050
8c5b83f0 2051 return ERR_PTR(err);
6b9ea5a6
RP		 2052}
2053
2054int ip6_route_add(struct fib6_config *cfg)
2055{
2056 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2057 struct rt6_info *rt;
6b9ea5a6
RP		 2058 int err;
2059
8c5b83f0
RP		 2060 rt = ip6_route_info_create(cfg);
2061 if (IS_ERR(rt)) {
2062 err = PTR_ERR(rt);
2063 rt = NULL;
6b9ea5a6 2064 goto out;
8c5b83f0 2065 }
6b9ea5a6 2066
e715b6d3
FW		 2067 err = ip6_convert_metrics(&mxc, cfg);
2068 if (err)
2069 goto out;
1da177e4 2070
e715b6d3
FW		 2071 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2072
2073 kfree(mxc.mx);
6b9ea5a6 2074
e715b6d3 2075 return err;
1da177e4 2076out:
1da177e4 2077 if (rt)
d8d1f30b 2078 dst_free(&rt->dst);
6b9ea5a6 2079
1da177e4
LT		 2080 return err;
2081}
2082
86872cb5 2083static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2084{
2085 int err;
c71099ac 2086 struct fib6_table *table;
d1918542 2087 struct net *net = dev_net(rt->dst.dev);
1da177e4 2088
8e3d5be7
MKL		 2089 if (rt == net->ipv6.ip6_null_entry ||
2090 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2091 err = -ENOENT;
2092 goto out;
2093 }
6c813a72 2094
c71099ac
TG		 2095 table = rt->rt6i_table;
2096 write_lock_bh(&table->tb6_lock);
86872cb5 2097 err = fib6_del(rt, info);
c71099ac 2098 write_unlock_bh(&table->tb6_lock);
1da177e4 2099
6825a26c 2100out:
94e187c0 2101 ip6_rt_put(rt);
1da177e4
LT		 2102 return err;
2103}
2104
e0a1ad73
TG		 2105int ip6_del_rt(struct rt6_info *rt)
2106{
4d1169c1 2107 struct nl_info info = {
d1918542 2108 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2109 };
528c4ceb 2110 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2111}
2112
86872cb5 2113static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2114{
c71099ac 2115 struct fib6_table *table;
1da177e4
LT		 2116 struct fib6_node *fn;
2117 struct rt6_info *rt;
2118 int err = -ESRCH;
2119
5578689a 2120 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2121 if (!table)
c71099ac
TG		 2122 return err;
2123
2124 read_lock_bh(&table->tb6_lock);
1da177e4 2125
c71099ac 2126 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2127 &cfg->fc_dst, cfg->fc_dst_len,
2128 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2129
1da177e4 2130 if (fn) {
d8d1f30b 2131 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2132 if ((rt->rt6i_flags & RTF_CACHE) &&
2133 !(cfg->fc_flags & RTF_CACHE))
2134 continue;
86872cb5 2135 if (cfg->fc_ifindex &&
d1918542
DM		 2136 (!rt->dst.dev ||
2137 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2138 continue;
86872cb5
TG		 2139 if (cfg->fc_flags & RTF_GATEWAY &&
2140 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2141 continue;
86872cb5 2142 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2143 continue;
d8d1f30b 2144 dst_hold(&rt->dst);
c71099ac 2145 read_unlock_bh(&table->tb6_lock);
1da177e4 2146
86872cb5 2147 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2148 }
2149 }
c71099ac 2150 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2151
2152 return err;
2153}
2154
6700c270 2155static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2156{
a6279458 2157 struct netevent_redirect netevent;
e8599ff4 2158 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2159 struct ndisc_options ndopts;
2160 struct inet6_dev *in6_dev;
2161 struct neighbour *neigh;
71bcdba0 2162 struct rd_msg *msg;
6e157b6a
DM		 2163 int optlen, on_link;
2164 u8 *lladdr;
e8599ff4 2165
29a3cad5 2166 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2167 optlen -= sizeof(*msg);
e8599ff4
DM		 2168
2169 if (optlen < 0) {
6e157b6a 2170 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2171 return;
2172 }
2173
71bcdba0 2174 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2175
71bcdba0 2176 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2177 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2178 return;
2179 }
2180
6e157b6a 2181 on_link = 0;
71bcdba0 2182 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2183 on_link = 1;
71bcdba0 2184 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2185 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2186 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2187 return;
2188 }
2189
2190 in6_dev = __in6_dev_get(skb->dev);
2191 if (!in6_dev)
2192 return;
2193 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2194 return;
2195
2196 /* RFC2461 8.1:
2197 * The IP source address of the Redirect MUST be the same as the current
2198 * first-hop router for the specified ICMP Destination Address.
2199 */
2200
71bcdba0 2201 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2202 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2203 return;
2204 }
6e157b6a
DM		 2205
2206 lladdr = NULL;
e8599ff4
DM		 2207 if (ndopts.nd_opts_tgt_lladdr) {
2208 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2209 skb->dev);
2210 if (!lladdr) {
2211 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2212 return;
2213 }
2214 }
2215
6e157b6a 2216 rt = (struct rt6_info *) dst;
ec13ad1d 2217 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2218 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2219 return;
6e157b6a 2220 }
e8599ff4 2221
6e157b6a
DM		 2222 /* Redirect received -> path was valid.
2223 * Look, redirects are sent only in response to data packets,
2224 * so that this nexthop apparently is reachable. --ANK
2225 */
2226 dst_confirm(&rt->dst);
a6279458 2227
71bcdba0 2228 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2229 if (!neigh)
2230 return;
a6279458 2231
1da177e4
LT		 2232 /*
2233 * We have finally decided to accept it.
2234 */
2235
1ab1457c 2236 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2237 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2238 NEIGH_UPDATE_F_OVERRIDE|
2239 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2240 NEIGH_UPDATE_F_ISROUTER))
2241 );
2242
83a09abd 2243 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2244 if (!nrt)
1da177e4
LT		 2245 goto out;
2246
2247 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2248 if (on_link)
2249 nrt->rt6i_flags &= ~RTF_GATEWAY;
2250
4e3fd7a0 2251 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2252
40e22e8f 2253 if (ip6_ins_rt(nrt))
1da177e4
LT		 2254 goto out;
2255
d8d1f30b
CG		 2256 netevent.old = &rt->dst;
2257 netevent.new = &nrt->dst;
71bcdba0 2258 netevent.daddr = &msg->dest;
60592833 2259 netevent.neigh = neigh;
8d71740c
TT		 2260 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2261
38308473 2262 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2263 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2264 ip6_del_rt(rt);
1da177e4
LT		 2265 }
2266
2267out:
e8599ff4 2268 neigh_release(neigh);
6e157b6a
DM		 2269}
2270
1da177e4
LT		 2271/*
2272 * Misc support functions
2273 */
2274
4b32b5ad
MKL		 2275static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2276{
2277 BUG_ON(from->dst.from);
2278
2279 rt->rt6i_flags &= ~RTF_EXPIRES;
2280 dst_hold(&from->dst);
2281 rt->dst.from = &from->dst;
2282 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2283}
2284
83a09abd
MKL		 2285static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2286{
2287 rt->dst.input = ort->dst.input;
2288 rt->dst.output = ort->dst.output;
2289 rt->rt6i_dst = ort->rt6i_dst;
2290 rt->dst.error = ort->dst.error;
2291 rt->rt6i_idev = ort->rt6i_idev;
2292 if (rt->rt6i_idev)
2293 in6_dev_hold(rt->rt6i_idev);
2294 rt->dst.lastuse = jiffies;
2295 rt->rt6i_gateway = ort->rt6i_gateway;
2296 rt->rt6i_flags = ort->rt6i_flags;
2297 rt6_set_from(rt, ort);
2298 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2299#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2300 rt->rt6i_src = ort->rt6i_src;
1da177e4 2301#endif
83a09abd
MKL		 2302 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2303 rt->rt6i_table = ort->rt6i_table;
61adedf3 2304 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2305}
2306
70ceb4f5 2307#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2308static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2309 const struct in6_addr *prefix, int prefixlen,
2310 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2311{
2312 struct fib6_node *fn;
2313 struct rt6_info *rt = NULL;
c71099ac
TG		 2314 struct fib6_table *table;
2315
efa2cea0 2316 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2317 if (!table)
c71099ac 2318 return NULL;
70ceb4f5 2319
5744dd9b 2320 read_lock_bh(&table->tb6_lock);
67ba4152 2321 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2322 if (!fn)
2323 goto out;
2324
d8d1f30b 2325 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2326 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2327 continue;
2328 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2329 continue;
2330 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2331 continue;
d8d1f30b 2332 dst_hold(&rt->dst);
70ceb4f5
YH		 2333 break;
2334 }
2335out:
5744dd9b 2336 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2337 return rt;
2338}
2339
efa2cea0 2340static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2341 const struct in6_addr *prefix, int prefixlen,
2342 const struct in6_addr *gwaddr, int ifindex,
95c96174 2343 unsigned int pref)
70ceb4f5 2344{
86872cb5 2345 struct fib6_config cfg = {
238fc7ea 2346 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2347 .fc_ifindex = ifindex,
2348 .fc_dst_len = prefixlen,
2349 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2350 RTF_UP | RTF_PREF(pref),
15e47304 2351 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2352 .fc_nlinfo.nlh = NULL,
2353 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2354 };
2355
ca254490 2356 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2357 cfg.fc_dst = *prefix;
2358 cfg.fc_gateway = *gwaddr;
70ceb4f5 2359
e317da96
YH		 2360 /* We should treat it as a default route if prefix length is 0. */
2361 if (!prefixlen)
86872cb5 2362 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2363
86872cb5 2364 ip6_route_add(&cfg);
70ceb4f5 2365
efa2cea0 2366 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2367}
2368#endif
2369
b71d1d42 2370struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2371{
1da177e4 2372 struct rt6_info *rt;
c71099ac 2373 struct fib6_table *table;
1da177e4 2374
c346dca1 2375 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2376 if (!table)
c71099ac 2377 return NULL;
1da177e4 2378
5744dd9b 2379 read_lock_bh(&table->tb6_lock);
67ba4152 2380 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2381 if (dev == rt->dst.dev &&
045927ff 2382 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2383 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2384 break;
2385 }
2386 if (rt)
d8d1f30b 2387 dst_hold(&rt->dst);
5744dd9b 2388 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2389 return rt;
2390}
2391
b71d1d42 2392struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2393 struct net_device *dev,
2394 unsigned int pref)
1da177e4 2395{
86872cb5 2396 struct fib6_config cfg = {
ca254490 2397 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2398 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2399 .fc_ifindex = dev->ifindex,
2400 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2401 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2402 .fc_nlinfo.portid = 0,
5578689a 2403 .fc_nlinfo.nlh = NULL,
c346dca1 2404 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2405 };
1da177e4 2406
4e3fd7a0 2407 cfg.fc_gateway = *gwaddr;
1da177e4 2408
86872cb5 2409 ip6_route_add(&cfg);
1da177e4 2410
1da177e4
LT		 2411 return rt6_get_dflt_router(gwaddr, dev);
2412}
2413
7b4da532 2414void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2415{
2416 struct rt6_info *rt;
c71099ac
TG		 2417 struct fib6_table *table;
2418
2419 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2420 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2421 if (!table)
c71099ac 2422 return;
1da177e4
LT		 2423
2424restart:
c71099ac 2425 read_lock_bh(&table->tb6_lock);
d8d1f30b 2426 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2427 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2428 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2429 dst_hold(&rt->dst);
c71099ac 2430 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2431 ip6_del_rt(rt);
1da177e4
LT		 2432 goto restart;
2433 }
2434 }
c71099ac 2435 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2436}
2437
5578689a
DL		 2438static void rtmsg_to_fib6_config(struct net *net,
2439 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2440 struct fib6_config *cfg)
2441{
2442 memset(cfg, 0, sizeof(*cfg));
2443
ca254490
DA		 2444 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2445 : RT6_TABLE_MAIN;
86872cb5
TG		 2446 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2447 cfg->fc_metric = rtmsg->rtmsg_metric;
2448 cfg->fc_expires = rtmsg->rtmsg_info;
2449 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2450 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2451 cfg->fc_flags = rtmsg->rtmsg_flags;
2452
5578689a 2453 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2454
4e3fd7a0
AD		 2455 cfg->fc_dst = rtmsg->rtmsg_dst;
2456 cfg->fc_src = rtmsg->rtmsg_src;
2457 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2458}
2459
5578689a 2460int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2461{
86872cb5 2462 struct fib6_config cfg;
1da177e4
LT		 2463 struct in6_rtmsg rtmsg;
2464 int err;
2465
67ba4152 2466 switch (cmd) {
1da177e4
LT		 2467 case SIOCADDRT: /* Add a route */
2468 case SIOCDELRT: /* Delete a route */
af31f412 2469 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2470 return -EPERM;
2471 err = copy_from_user(&rtmsg, arg,
2472 sizeof(struct in6_rtmsg));
2473 if (err)
2474 return -EFAULT;
86872cb5 2475
5578689a 2476 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2477
1da177e4
LT		 2478 rtnl_lock();
2479 switch (cmd) {
2480 case SIOCADDRT:
86872cb5 2481 err = ip6_route_add(&cfg);
1da177e4
LT		 2482 break;
2483 case SIOCDELRT:
86872cb5 2484 err = ip6_route_del(&cfg);
1da177e4
LT		 2485 break;
2486 default:
2487 err = -EINVAL;
2488 }
2489 rtnl_unlock();
2490
2491 return err;
3ff50b79 2492 }
1da177e4
LT		 2493
2494 return -EINVAL;
2495}
2496
2497/*
2498 * Drop the packet on the floor
2499 */
2500
d5fdd6ba 2501static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2502{
612f09e8 2503 int type;
adf30907 2504 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2505 switch (ipstats_mib_noroutes) {
2506 case IPSTATS_MIB_INNOROUTES:
0660e03f 2507 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2508 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2509 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2510 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2511 break;
2512 }
2513 /* FALLTHROUGH */
2514 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2515 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2516 ipstats_mib_noroutes);
612f09e8
YH		 2517 break;
2518 }
3ffe533c 2519 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2520 kfree_skb(skb);
2521 return 0;
2522}
2523
9ce8ade0
TG		 2524static int ip6_pkt_discard(struct sk_buff *skb)
2525{
612f09e8 2526 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2527}
2528
ede2059d 2529static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2530{
adf30907 2531 skb->dev = skb_dst(skb)->dev;
612f09e8 2532 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2533}
2534
9ce8ade0
TG		 2535static int ip6_pkt_prohibit(struct sk_buff *skb)
2536{
612f09e8 2537 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2538}
2539
ede2059d 2540static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2541{
adf30907 2542 skb->dev = skb_dst(skb)->dev;
612f09e8 2543 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2544}
2545
1da177e4
LT		 2546/*
2547 * Allocate a dst for local (unicast / anycast) address.
2548 */
2549
2550struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2551 const struct in6_addr *addr,
8f031519 2552 bool anycast)
1da177e4 2553{
ca254490 2554 u32 tb_id;
c346dca1 2555 struct net *net = dev_net(idev->dev);
a3300ef4 2556 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2557 DST_NOCOUNT);
a3300ef4 2558 if (!rt)
1da177e4
LT		 2559 return ERR_PTR(-ENOMEM);
2560
1da177e4
LT		 2561 in6_dev_hold(idev);
2562
11d53b49 2563 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2564 rt->dst.input = ip6_input;
2565 rt->dst.output = ip6_output;
1da177e4 2566 rt->rt6i_idev = idev;
1da177e4
LT		 2567
2568 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2569 if (anycast)
2570 rt->rt6i_flags |= RTF_ANYCAST;
2571 else
1da177e4 2572 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2573
550bab42 2574 rt->rt6i_gateway = *addr;
4e3fd7a0 2575 rt->rt6i_dst.addr = *addr;
1da177e4 2576 rt->rt6i_dst.plen = 128;
ca254490
DA		 2577 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2578 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2579 rt->dst.flags |= DST_NOCACHE;
1da177e4 2580
d8d1f30b 2581 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2582
2583 return rt;
2584}
2585
c3968a85
DW		 2586int ip6_route_get_saddr(struct net *net,
2587 struct rt6_info *rt,
b71d1d42 2588 const struct in6_addr *daddr,
c3968a85
DW		 2589 unsigned int prefs,
2590 struct in6_addr *saddr)
2591{
e16e888b
MS		 2592 struct inet6_dev *idev =
2593 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2594 int err = 0;
e16e888b 2595 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2596 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2597 else
2598 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2599 daddr, prefs, saddr);
2600 return err;
2601}
2602
2603/* remove deleted ip from prefsrc entries */
2604struct arg_dev_net_ip {
2605 struct net_device *dev;
2606 struct net *net;
2607 struct in6_addr *addr;
2608};
2609
2610static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2611{
2612 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2613 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2614 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2615
d1918542 2616 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2617 rt != net->ipv6.ip6_null_entry &&
2618 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2619 /* remove prefsrc entry */
2620 rt->rt6i_prefsrc.plen = 0;
2621 }
2622 return 0;
2623}
2624
2625void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2626{
2627 struct net *net = dev_net(ifp->idev->dev);
2628 struct arg_dev_net_ip adni = {
2629 .dev = ifp->idev->dev,
2630 .net = net,
2631 .addr = &ifp->addr,
2632 };
0c3584d5 2633 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2634}
2635
be7a010d
DJ		 2636#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2637#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2638
2639/* Remove routers and update dst entries when gateway turn into host. */
2640static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2641{
2642 struct in6_addr *gateway = (struct in6_addr *)arg;
2643
2644 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2645 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2646 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2647 return -1;
2648 }
2649 return 0;
2650}
2651
2652void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2653{
2654 fib6_clean_all(net, fib6_clean_tohost, gateway);
2655}
2656
8ed67789
DL		 2657struct arg_dev_net {
2658 struct net_device *dev;
2659 struct net *net;
2660};
2661
1da177e4
LT		 2662static int fib6_ifdown(struct rt6_info *rt, void *arg)
2663{
bc3ef660 2664 const struct arg_dev_net *adn = arg;
2665 const struct net_device *dev = adn->dev;
8ed67789 2666
d1918542 2667 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2668 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2669 return -1;
c159d30c 2670
1da177e4
LT		 2671 return 0;
2672}
2673
f3db4851 2674void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2675{
8ed67789
DL		 2676 struct arg_dev_net adn = {
2677 .dev = dev,
2678 .net = net,
2679 };
2680
0c3584d5 2681 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2682 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2683 if (dev)
2684 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2685}
2686
95c96174 2687struct rt6_mtu_change_arg {
1da177e4 2688 struct net_device *dev;
95c96174 2689 unsigned int mtu;
1da177e4
LT		 2690};
2691
2692static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2693{
2694 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2695 struct inet6_dev *idev;
2696
2697 /* In IPv6 pmtu discovery is not optional,
2698 so that RTAX_MTU lock cannot disable it.
2699 We still use this lock to block changes
2700 caused by addrconf/ndisc.
2701 */
2702
2703 idev = __in6_dev_get(arg->dev);
38308473 2704 if (!idev)
1da177e4
LT		 2705 return 0;
2706
2707 /* For administrative MTU increase, there is no way to discover
2708 IPv6 PMTU increase, so PMTU increase should be updated here.
2709 Since RFC 1981 doesn't include administrative MTU increase
2710 update PMTU increase is a MUST. (i.e. jumbo frame)
2711 */
2712 /*
2713 If new MTU is less than route PMTU, this new MTU will be the
2714 lowest MTU in the path, update the route PMTU to reflect PMTU
2715 decreases; if new MTU is greater than route PMTU, and the
2716 old MTU is the lowest MTU in the path, update the route PMTU
2717 to reflect the increase. In this case if the other nodes' MTU
2718 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2719 PMTU discouvery.
2720 */
d1918542 2721 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2722 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2723 if (rt->rt6i_flags & RTF_CACHE) {
2724 /* For RTF_CACHE with rt6i_pmtu == 0
2725 * (i.e. a redirected route),
2726 * the metrics of its rt->dst.from has already
2727 * been updated.
2728 */
2729 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2730 rt->rt6i_pmtu = arg->mtu;
2731 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2732 (dst_mtu(&rt->dst) < arg->mtu &&
2733 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2734 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2735 }
566cfd8f 2736 }
1da177e4
LT		 2737 return 0;
2738}
2739
95c96174 2740void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2741{
c71099ac
TG		 2742 struct rt6_mtu_change_arg arg = {
2743 .dev = dev,
2744 .mtu = mtu,
2745 };
1da177e4 2746
0c3584d5 2747 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2748}
2749
ef7c79ed 2750static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2751 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2752 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2753 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2754 [RTA_PRIORITY] = { .type = NLA_U32 },
2755 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2756 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2757 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2758 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2759 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2760 [RTA_EXPIRES] = { .type = NLA_U32 },
86872cb5
TG		 2761};
2762
2763static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2764 struct fib6_config *cfg)
1da177e4 2765{
86872cb5
TG		 2766 struct rtmsg *rtm;
2767 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2768 unsigned int pref;
86872cb5 2769 int err;
1da177e4 2770
86872cb5
TG		 2771 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2772 if (err < 0)
2773 goto errout;
1da177e4 2774
86872cb5
TG		 2775 err = -EINVAL;
2776 rtm = nlmsg_data(nlh);
2777 memset(cfg, 0, sizeof(*cfg));
2778
2779 cfg->fc_table = rtm->rtm_table;
2780 cfg->fc_dst_len = rtm->rtm_dst_len;
2781 cfg->fc_src_len = rtm->rtm_src_len;
2782 cfg->fc_flags = RTF_UP;
2783 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2784 cfg->fc_type = rtm->rtm_type;
86872cb5 2785
ef2c7d7b
ND		 2786 if (rtm->rtm_type == RTN_UNREACHABLE ||
2787 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2788 rtm->rtm_type == RTN_PROHIBIT ||
2789 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2790 cfg->fc_flags |= RTF_REJECT;
2791
ab79ad14
MŻ		 2792 if (rtm->rtm_type == RTN_LOCAL)
2793 cfg->fc_flags |= RTF_LOCAL;
2794
1f56a01f
MKL		 2795 if (rtm->rtm_flags & RTM_F_CLONED)
2796 cfg->fc_flags |= RTF_CACHE;
2797
15e47304 2798 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2799 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2800 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2801
2802 if (tb[RTA_GATEWAY]) {
67b61f6c 2803 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2804 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2805 }
86872cb5
TG		 2806
2807 if (tb[RTA_DST]) {
2808 int plen = (rtm->rtm_dst_len + 7) >> 3;
2809
2810 if (nla_len(tb[RTA_DST]) < plen)
2811 goto errout;
2812
2813 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2814 }
86872cb5
TG		 2815
2816 if (tb[RTA_SRC]) {
2817 int plen = (rtm->rtm_src_len + 7) >> 3;
2818
2819 if (nla_len(tb[RTA_SRC]) < plen)
2820 goto errout;
2821
2822 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2823 }
86872cb5 2824
c3968a85 2825 if (tb[RTA_PREFSRC])
67b61f6c 2826 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2827
86872cb5
TG		 2828 if (tb[RTA_OIF])
2829 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2830
2831 if (tb[RTA_PRIORITY])
2832 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2833
2834 if (tb[RTA_METRICS]) {
2835 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2836 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2837 }
86872cb5
TG		 2838
2839 if (tb[RTA_TABLE])
2840 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2841
51ebd318
ND		 2842 if (tb[RTA_MULTIPATH]) {
2843 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2844 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2845 }
2846
c78ba6d6
LR		 2847 if (tb[RTA_PREF]) {
2848 pref = nla_get_u8(tb[RTA_PREF]);
2849 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2850 pref != ICMPV6_ROUTER_PREF_HIGH)
2851 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2852 cfg->fc_flags |= RTF_PREF(pref);
2853 }
2854
19e42e45
RP		 2855 if (tb[RTA_ENCAP])
2856 cfg->fc_encap = tb[RTA_ENCAP];
2857
2858 if (tb[RTA_ENCAP_TYPE])
2859 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2860
32bc201e
XL		 2861 if (tb[RTA_EXPIRES]) {
2862 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2863
2864 if (addrconf_finite_timeout(timeout)) {
2865 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2866 cfg->fc_flags |= RTF_EXPIRES;
2867 }
2868 }
2869
86872cb5
TG		 2870 err = 0;
2871errout:
2872 return err;
1da177e4
LT		 2873}
2874
6b9ea5a6
RP		 2875struct rt6_nh {
2876 struct rt6_info *rt6_info;
2877 struct fib6_config r_cfg;
2878 struct mx6_config mxc;
2879 struct list_head next;
2880};
2881
2882static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2883{
2884 struct rt6_nh *nh;
2885
2886 list_for_each_entry(nh, rt6_nh_list, next) {
2887 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2888 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2889 nh->r_cfg.fc_ifindex);
2890 }
2891}
2892
2893static int ip6_route_info_append(struct list_head *rt6_nh_list,
2894 struct rt6_info *rt, struct fib6_config *r_cfg)
2895{
2896 struct rt6_nh *nh;
2897 struct rt6_info *rtnh;
2898 int err = -EEXIST;
2899
2900 list_for_each_entry(nh, rt6_nh_list, next) {
2901 /* check if rt6_info already exists */
2902 rtnh = nh->rt6_info;
2903
2904 if (rtnh->dst.dev == rt->dst.dev &&
2905 rtnh->rt6i_idev == rt->rt6i_idev &&
2906 ipv6_addr_equal(&rtnh->rt6i_gateway,
2907 &rt->rt6i_gateway))
2908 return err;
2909 }
2910
2911 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2912 if (!nh)
2913 return -ENOMEM;
2914 nh->rt6_info = rt;
2915 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2916 if (err) {
2917 kfree(nh);
2918 return err;
2919 }
2920 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2921 list_add_tail(&nh->next, rt6_nh_list);
2922
2923 return 0;
2924}
2925
2926static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2927{
2928 struct fib6_config r_cfg;
2929 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2930 struct rt6_info *rt;
2931 struct rt6_nh *err_nh;
2932 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2933 int remaining;
2934 int attrlen;
6b9ea5a6
RP		 2935 int err = 1;
2936 int nhn = 0;
2937 int replace = (cfg->fc_nlinfo.nlh &&
2938 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2939 LIST_HEAD(rt6_nh_list);
51ebd318 2940
35f1b4e9 2941 remaining = cfg->fc_mp_len;
51ebd318 2942 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2943
6b9ea5a6
RP		 2944 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2945 * rt6_info structs per nexthop
2946 */
51ebd318
ND		 2947 while (rtnh_ok(rtnh, remaining)) {
2948 memcpy(&r_cfg, cfg, sizeof(*cfg));
2949 if (rtnh->rtnh_ifindex)
2950 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2951
2952 attrlen = rtnh_attrlen(rtnh);
2953 if (attrlen > 0) {
2954 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2955
2956 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2957 if (nla) {
67b61f6c 2958 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2959 r_cfg.fc_flags |= RTF_GATEWAY;
2960 }
19e42e45
RP		 2961 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2962 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2963 if (nla)
2964 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2965 }
6b9ea5a6 2966
8c5b83f0
RP		 2967 rt = ip6_route_info_create(&r_cfg);
2968 if (IS_ERR(rt)) {
2969 err = PTR_ERR(rt);
2970 rt = NULL;
6b9ea5a6 2971 goto cleanup;
8c5b83f0 2972 }
6b9ea5a6
RP		 2973
2974 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2975 if (err) {
6b9ea5a6
RP		 2976 dst_free(&rt->dst);
2977 goto cleanup;
2978 }
2979
2980 rtnh = rtnh_next(rtnh, &remaining);
2981 }
2982
2983 err_nh = NULL;
2984 list_for_each_entry(nh, &rt6_nh_list, next) {
2985 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2986 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2987 nh->rt6_info = NULL;
2988 if (err) {
2989 if (replace && nhn)
2990 ip6_print_replace_route_err(&rt6_nh_list);
2991 err_nh = nh;
2992 goto add_errout;
51ebd318 2993 }
6b9ea5a6 2994
1a72418b 2995 /* Because each route is added like a single route we remove
27596472
MK		 2996 * these flags after the first nexthop: if there is a collision,
2997 * we have already failed to add the first nexthop:
2998 * fib6_add_rt2node() has rejected it; when replacing, old
2999 * nexthops have been replaced by first new, the rest should
3000 * be added to it.
1a72418b 3001 */
27596472
MK		 3002 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3003 NLM_F_REPLACE);
6b9ea5a6
RP		 3004 nhn++;
3005 }
3006
3007 goto cleanup;
3008
3009add_errout:
3010 /* Delete routes that were already added */
3011 list_for_each_entry(nh, &rt6_nh_list, next) {
3012 if (err_nh == nh)
3013 break;
3014 ip6_route_del(&nh->r_cfg);
3015 }
3016
3017cleanup:
3018 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3019 if (nh->rt6_info)
3020 dst_free(&nh->rt6_info->dst);
52fe51f8 3021 kfree(nh->mxc.mx);
6b9ea5a6
RP		 3022 list_del(&nh->next);
3023 kfree(nh);
3024 }
3025
3026 return err;
3027}
3028
3029static int ip6_route_multipath_del(struct fib6_config *cfg)
3030{
3031 struct fib6_config r_cfg;
3032 struct rtnexthop *rtnh;
3033 int remaining;
3034 int attrlen;
3035 int err = 1, last_err = 0;
3036
3037 remaining = cfg->fc_mp_len;
3038 rtnh = (struct rtnexthop *)cfg->fc_mp;
3039
3040 /* Parse a Multipath Entry */
3041 while (rtnh_ok(rtnh, remaining)) {
3042 memcpy(&r_cfg, cfg, sizeof(*cfg));
3043 if (rtnh->rtnh_ifindex)
3044 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3045
3046 attrlen = rtnh_attrlen(rtnh);
3047 if (attrlen > 0) {
3048 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3049
3050 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3051 if (nla) {
3052 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3053 r_cfg.fc_flags |= RTF_GATEWAY;
3054 }
3055 }
3056 err = ip6_route_del(&r_cfg);
3057 if (err)
3058 last_err = err;
3059
51ebd318
ND		 3060 rtnh = rtnh_next(rtnh, &remaining);
3061 }
3062
3063 return last_err;
3064}
3065
67ba4152 3066static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3067{
86872cb5
TG		 3068 struct fib6_config cfg;
3069 int err;
1da177e4 3070
86872cb5
TG		 3071 err = rtm_to_fib6_config(skb, nlh, &cfg);
3072 if (err < 0)
3073 return err;
3074
51ebd318 3075 if (cfg.fc_mp)
6b9ea5a6 3076 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3077 else
3078 return ip6_route_del(&cfg);
1da177e4
LT		 3079}
3080
67ba4152 3081static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3082{
86872cb5
TG		 3083 struct fib6_config cfg;
3084 int err;
1da177e4 3085
86872cb5
TG		 3086 err = rtm_to_fib6_config(skb, nlh, &cfg);
3087 if (err < 0)
3088 return err;
3089
51ebd318 3090 if (cfg.fc_mp)
6b9ea5a6 3091 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3092 else
3093 return ip6_route_add(&cfg);
1da177e4
LT		 3094}
3095
19e42e45 3096static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3097{
3098 return NLMSG_ALIGN(sizeof(struct rtmsg))
3099 + nla_total_size(16) /* RTA_SRC */
3100 + nla_total_size(16) /* RTA_DST */
3101 + nla_total_size(16) /* RTA_GATEWAY */
3102 + nla_total_size(16) /* RTA_PREFSRC */
3103 + nla_total_size(4) /* RTA_TABLE */
3104 + nla_total_size(4) /* RTA_IIF */
3105 + nla_total_size(4) /* RTA_OIF */
3106 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3107 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3108 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3109 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3110 + nla_total_size(1) /* RTA_PREF */
61adedf3 3111 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3112}
3113
191cd582
BH		 3114static int rt6_fill_node(struct net *net,
3115 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3116 struct in6_addr *dst, struct in6_addr *src,
15e47304 3117 int iif, int type, u32 portid, u32 seq,
7bc570c8 3118 int prefix, int nowait, unsigned int flags)
1da177e4 3119{
4b32b5ad 3120 u32 metrics[RTAX_MAX];
1da177e4 3121 struct rtmsg *rtm;
2d7202bf 3122 struct nlmsghdr *nlh;
e3703b3d 3123 long expires;
9e762a4a 3124 u32 table;
1da177e4
LT		 3125
3126 if (prefix) { /* user wants prefix routes only */
3127 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3128 /* success since this is not a prefix route */
3129 return 1;
3130 }
3131 }
3132
15e47304 3133 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3134 if (!nlh)
26932566 3135 return -EMSGSIZE;
2d7202bf
TG		 3136
3137 rtm = nlmsg_data(nlh);
1da177e4
LT		 3138 rtm->rtm_family = AF_INET6;
3139 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3140 rtm->rtm_src_len = rt->rt6i_src.plen;
3141 rtm->rtm_tos = 0;
c71099ac 3142 if (rt->rt6i_table)
9e762a4a 3143 table = rt->rt6i_table->tb6_id;
c71099ac 3144 else
9e762a4a
PM		 3145 table = RT6_TABLE_UNSPEC;
3146 rtm->rtm_table = table;
c78679e8
DM		 3147 if (nla_put_u32(skb, RTA_TABLE, table))
3148 goto nla_put_failure;
ef2c7d7b
ND		 3149 if (rt->rt6i_flags & RTF_REJECT) {
3150 switch (rt->dst.error) {
3151 case -EINVAL:
3152 rtm->rtm_type = RTN_BLACKHOLE;
3153 break;
3154 case -EACCES:
3155 rtm->rtm_type = RTN_PROHIBIT;
3156 break;
b4949ab2
ND		 3157 case -EAGAIN:
3158 rtm->rtm_type = RTN_THROW;
3159 break;
ef2c7d7b
ND		 3160 default:
3161 rtm->rtm_type = RTN_UNREACHABLE;
3162 break;
3163 }
3164 }
38308473 3165 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3166 rtm->rtm_type = RTN_LOCAL;
d1918542 3167 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3168 rtm->rtm_type = RTN_LOCAL;
3169 else
3170 rtm->rtm_type = RTN_UNICAST;
3171 rtm->rtm_flags = 0;
35103d11 3172 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3173 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3174 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3175 rtm->rtm_flags |= RTNH_F_DEAD;
3176 }
1da177e4
LT		 3177 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3178 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3179 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3180 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3181 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3182 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3183 rtm->rtm_protocol = RTPROT_RA;
3184 else
3185 rtm->rtm_protocol = RTPROT_KERNEL;
3186 }
1da177e4 3187
38308473 3188 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3189 rtm->rtm_flags |= RTM_F_CLONED;
3190
3191 if (dst) {
930345ea 3192 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3193 goto nla_put_failure;
1ab1457c 3194 rtm->rtm_dst_len = 128;
1da177e4 3195 } else if (rtm->rtm_dst_len)
930345ea 3196 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3197 goto nla_put_failure;
1da177e4
LT		 3198#ifdef CONFIG_IPV6_SUBTREES
3199 if (src) {
930345ea 3200 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3201 goto nla_put_failure;
1ab1457c 3202 rtm->rtm_src_len = 128;
c78679e8 3203 } else if (rtm->rtm_src_len &&
930345ea 3204 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3205 goto nla_put_failure;
1da177e4 3206#endif
7bc570c8
YH		 3207 if (iif) {
3208#ifdef CONFIG_IPV6_MROUTE
3209 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3210 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3211 if (err <= 0) {
3212 if (!nowait) {
3213 if (err == 0)
3214 return 0;
3215 goto nla_put_failure;
3216 } else {
3217 if (err == -EMSGSIZE)
3218 goto nla_put_failure;
3219 }
3220 }
3221 } else
3222#endif
c78679e8
DM		 3223 if (nla_put_u32(skb, RTA_IIF, iif))
3224 goto nla_put_failure;
7bc570c8 3225 } else if (dst) {
1da177e4 3226 struct in6_addr saddr_buf;
c78679e8 3227 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3228 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3229 goto nla_put_failure;
1da177e4 3230 }
2d7202bf 3231
c3968a85
DW		 3232 if (rt->rt6i_prefsrc.plen) {
3233 struct in6_addr saddr_buf;
4e3fd7a0 3234 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3235 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3236 goto nla_put_failure;
c3968a85
DW		 3237 }
3238
4b32b5ad
MKL		 3239 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3240 if (rt->rt6i_pmtu)
3241 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3242 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3243 goto nla_put_failure;
3244
dd0cbf29 3245 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3246 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3247 goto nla_put_failure;
94f826b8 3248 }
2d7202bf 3249
c78679e8
DM		 3250 if (rt->dst.dev &&
3251 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3252 goto nla_put_failure;
3253 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3254 goto nla_put_failure;
8253947e
LW		 3255
3256 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3257
87a50699 3258 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3259 goto nla_put_failure;
2d7202bf 3260
c78ba6d6
LR		 3261 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3262 goto nla_put_failure;
3263
61adedf3 3264 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3265
053c095a
JB		 3266 nlmsg_end(skb, nlh);
3267 return 0;
2d7202bf
TG		 3268
3269nla_put_failure:
26932566
PM		 3270 nlmsg_cancel(skb, nlh);
3271 return -EMSGSIZE;
1da177e4
LT		 3272}
3273
1b43af54 3274int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3275{
3276 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3277 int prefix;
3278
2d7202bf
TG		 3279 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3280 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3281 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3282 } else
3283 prefix = 0;
3284
191cd582
BH		 3285 return rt6_fill_node(arg->net,
3286 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3287 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3288 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3289}
3290
67ba4152 3291static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3292{
3b1e0a65 3293 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3294 struct nlattr *tb[RTA_MAX+1];
3295 struct rt6_info *rt;
1da177e4 3296 struct sk_buff *skb;
ab364a6f 3297 struct rtmsg *rtm;
4c9483b2 3298 struct flowi6 fl6;
72331bc0 3299 int err, iif = 0, oif = 0;
1da177e4 3300
ab364a6f
TG		 3301 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3302 if (err < 0)
3303 goto errout;
1da177e4 3304
ab364a6f 3305 err = -EINVAL;
4c9483b2 3306 memset(&fl6, 0, sizeof(fl6));
1da177e4 3307
ab364a6f
TG		 3308 if (tb[RTA_SRC]) {
3309 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3310 goto errout;
3311
4e3fd7a0 3312 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3313 }
3314
3315 if (tb[RTA_DST]) {
3316 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3317 goto errout;
3318
4e3fd7a0 3319 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3320 }
3321
3322 if (tb[RTA_IIF])
3323 iif = nla_get_u32(tb[RTA_IIF]);
3324
3325 if (tb[RTA_OIF])
72331bc0 3326 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3327
2e47b291
LC		 3328 if (tb[RTA_MARK])
3329 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3330
1da177e4
LT		 3331 if (iif) {
3332 struct net_device *dev;
72331bc0
SL		 3333 int flags = 0;
3334
5578689a 3335 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3336 if (!dev) {
3337 err = -ENODEV;
ab364a6f 3338 goto errout;
1da177e4 3339 }
72331bc0
SL		 3340
3341 fl6.flowi6_iif = iif;
3342
3343 if (!ipv6_addr_any(&fl6.saddr))
3344 flags |= RT6_LOOKUP_F_HAS_SADDR;
3345
3346 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3347 flags);
3348 } else {
3349 fl6.flowi6_oif = oif;
3350
ca254490
DA		 3351 if (netif_index_is_l3_master(net, oif)) {
3352 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3353 FLOWI_FLAG_SKIP_NH_OIF;
3354 }
3355
72331bc0 3356 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3357 }
3358
ab364a6f 3359 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3360 if (!skb) {
94e187c0 3361 ip6_rt_put(rt);
ab364a6f
TG		 3362 err = -ENOBUFS;
3363 goto errout;
3364 }
1da177e4 3365
ab364a6f
TG		 3366 /* Reserve room for dummy headers, this skb can pass
3367 through good chunk of routing engine.
3368 */
459a98ed 3369 skb_reset_mac_header(skb);
ab364a6f 3370 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3371
d8d1f30b 3372 skb_dst_set(skb, &rt->dst);
1da177e4 3373
4c9483b2 3374 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3375 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3376 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3377 if (err < 0) {
ab364a6f
TG		 3378 kfree_skb(skb);
3379 goto errout;
1da177e4
LT		 3380 }
3381
15e47304 3382 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3383errout:
1da177e4 3384 return err;
1da177e4
LT		 3385}
3386
37a1d361
RP		 3387void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3388 unsigned int nlm_flags)
1da177e4
LT		 3389{
3390 struct sk_buff *skb;
5578689a 3391 struct net *net = info->nl_net;
528c4ceb
DL		 3392 u32 seq;
3393 int err;
3394
3395 err = -ENOBUFS;
38308473 3396 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3397
19e42e45 3398 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3399 if (!skb)
21713ebc
TG		 3400 goto errout;
3401
191cd582 3402 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3403 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3404 if (err < 0) {
3405 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3406 WARN_ON(err == -EMSGSIZE);
3407 kfree_skb(skb);
3408 goto errout;
3409 }
15e47304 3410 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3411 info->nlh, gfp_any());
3412 return;
21713ebc
TG		 3413errout:
3414 if (err < 0)
5578689a 3415 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3416}
3417
8ed67789 3418static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3419 unsigned long event, void *ptr)
8ed67789 3420{
351638e7 3421 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3422 struct net *net = dev_net(dev);
8ed67789
DL		 3423
3424 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3425 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3426 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3427#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3428 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3429 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3430 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3431 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3432#endif
3433 }
3434
3435 return NOTIFY_OK;
3436}
3437
1da177e4
LT		 3438/*
3439 * /proc
3440 */
3441
3442#ifdef CONFIG_PROC_FS
3443
33120b30
AD		 3444static const struct file_operations ipv6_route_proc_fops = {
3445 .owner = THIS_MODULE,
3446 .open = ipv6_route_open,
3447 .read = seq_read,
3448 .llseek = seq_lseek,
8d2ca1d7 3449 .release = seq_release_net,
33120b30
AD		 3450};
3451
1da177e4
LT		 3452static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3453{
69ddb805 3454 struct net *net = (struct net *)seq->private;
1da177e4 3455 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3456 net->ipv6.rt6_stats->fib_nodes,
3457 net->ipv6.rt6_stats->fib_route_nodes,
3458 net->ipv6.rt6_stats->fib_rt_alloc,
3459 net->ipv6.rt6_stats->fib_rt_entries,
3460 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3461 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3462 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3463
3464 return 0;
3465}
3466
3467static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3468{
de05c557 3469 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3470}
3471
9a32144e 3472static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3473 .owner = THIS_MODULE,
3474 .open = rt6_stats_seq_open,
3475 .read = seq_read,
3476 .llseek = seq_lseek,
b6fcbdb4 3477 .release = single_release_net,
1da177e4
LT		 3478};
3479#endif /* CONFIG_PROC_FS */
3480
3481#ifdef CONFIG_SYSCTL
3482
1da177e4 3483static
fe2c6338 3484int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3485 void __user *buffer, size_t *lenp, loff_t *ppos)
3486{
c486da34
LAG		 3487 struct net *net;
3488 int delay;
3489 if (!write)
1da177e4 3490 return -EINVAL;
c486da34
LAG		 3491
3492 net = (struct net *)ctl->extra1;
3493 delay = net->ipv6.sysctl.flush_delay;
3494 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3495 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3496 return 0;
1da177e4
LT		 3497}
3498
fe2c6338 3499struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3500 {
1da177e4 3501 .procname = "flush",
4990509f 3502 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3503 .maxlen = sizeof(int),
89c8b3a1 3504 .mode = 0200,
6d9f239a 3505 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3506 },
3507 {
1da177e4 3508 .procname = "gc_thresh",
9a7ec3a9 3509 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3510 .maxlen = sizeof(int),
3511 .mode = 0644,
6d9f239a 3512 .proc_handler = proc_dointvec,
1da177e4
LT		 3513 },
3514 {
1da177e4 3515 .procname = "max_size",
4990509f 3516 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3517 .maxlen = sizeof(int),
3518 .mode = 0644,
6d9f239a 3519 .proc_handler = proc_dointvec,
1da177e4
LT		 3520 },
3521 {
1da177e4 3522 .procname = "gc_min_interval",
4990509f 3523 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3524 .maxlen = sizeof(int),
3525 .mode = 0644,
6d9f239a 3526 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3527 },
3528 {
1da177e4 3529 .procname = "gc_timeout",
4990509f 3530 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3531 .maxlen = sizeof(int),
3532 .mode = 0644,
6d9f239a 3533 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3534 },
3535 {
1da177e4 3536 .procname = "gc_interval",
4990509f 3537 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3538 .maxlen = sizeof(int),
3539 .mode = 0644,
6d9f239a 3540 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3541 },
3542 {
1da177e4 3543 .procname = "gc_elasticity",
4990509f 3544 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3545 .maxlen = sizeof(int),
3546 .mode = 0644,
f3d3f616 3547 .proc_handler = proc_dointvec,
1da177e4
LT		 3548 },
3549 {
1da177e4 3550 .procname = "mtu_expires",
4990509f 3551 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3552 .maxlen = sizeof(int),
3553 .mode = 0644,
6d9f239a 3554 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3555 },
3556 {
1da177e4 3557 .procname = "min_adv_mss",
4990509f 3558 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3559 .maxlen = sizeof(int),
3560 .mode = 0644,
f3d3f616 3561 .proc_handler = proc_dointvec,
1da177e4
LT		 3562 },
3563 {
1da177e4 3564 .procname = "gc_min_interval_ms",
4990509f 3565 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3566 .maxlen = sizeof(int),
3567 .mode = 0644,
6d9f239a 3568 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3569 },
f8572d8f 3570 { }
1da177e4
LT		 3571};
3572
2c8c1e72 3573struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3574{
3575 struct ctl_table *table;
3576
3577 table = kmemdup(ipv6_route_table_template,
3578 sizeof(ipv6_route_table_template),
3579 GFP_KERNEL);
5ee09105
YH		 3580
3581 if (table) {
3582 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3583 table[0].extra1 = net;
86393e52 3584 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3585 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3586 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3587 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3588 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3589 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3590 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3591 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3592 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3593
3594 /* Don't export sysctls to unprivileged users */
3595 if (net->user_ns != &init_user_ns)
3596 table[0].procname = NULL;
5ee09105
YH		 3597 }
3598
760f2d01
DL		 3599 return table;
3600}
1da177e4
LT		 3601#endif
3602
2c8c1e72 3603static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3604{
633d424b 3605 int ret = -ENOMEM;
8ed67789 3606
86393e52
AD		 3607 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3608 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3609
fc66f95c
ED		 3610 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3611 goto out_ip6_dst_ops;
3612
8ed67789
DL		 3613 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3614 sizeof(*net->ipv6.ip6_null_entry),
3615 GFP_KERNEL);
3616 if (!net->ipv6.ip6_null_entry)
fc66f95c 3617 goto out_ip6_dst_entries;
d8d1f30b 3618 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3619 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3620 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3621 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3622 ip6_template_metrics, true);
8ed67789
DL		 3623
3624#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3625 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3626 sizeof(*net->ipv6.ip6_prohibit_entry),
3627 GFP_KERNEL);
68fffc67
PZ		 3628 if (!net->ipv6.ip6_prohibit_entry)
3629 goto out_ip6_null_entry;
d8d1f30b 3630 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3631 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3632 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3633 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3634 ip6_template_metrics, true);
8ed67789
DL		 3635
3636 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3637 sizeof(*net->ipv6.ip6_blk_hole_entry),
3638 GFP_KERNEL);
68fffc67
PZ		 3639 if (!net->ipv6.ip6_blk_hole_entry)
3640 goto out_ip6_prohibit_entry;
d8d1f30b 3641 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3642 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3643 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3644 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3645 ip6_template_metrics, true);
8ed67789
DL		 3646#endif
3647
b339a47c
PZ		 3648 net->ipv6.sysctl.flush_delay = 0;
3649 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3650 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3651 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3652 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3653 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3654 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3655 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3656
6891a346
BT		 3657 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3658
8ed67789
DL		 3659 ret = 0;
3660out:
3661 return ret;
f2fc6a54 3662
68fffc67
PZ		 3663#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3664out_ip6_prohibit_entry:
3665 kfree(net->ipv6.ip6_prohibit_entry);
3666out_ip6_null_entry:
3667 kfree(net->ipv6.ip6_null_entry);
3668#endif
fc66f95c
ED		 3669out_ip6_dst_entries:
3670 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3671out_ip6_dst_ops:
f2fc6a54 3672 goto out;
cdb18761
DL		 3673}
3674
2c8c1e72 3675static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3676{
8ed67789
DL		 3677 kfree(net->ipv6.ip6_null_entry);
3678#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3679 kfree(net->ipv6.ip6_prohibit_entry);
3680 kfree(net->ipv6.ip6_blk_hole_entry);
3681#endif
41bb78b4 3682 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3683}
3684
d189634e
TG		 3685static int __net_init ip6_route_net_init_late(struct net *net)
3686{
3687#ifdef CONFIG_PROC_FS
d4beaa66
G		 3688 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3689 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3690#endif
3691 return 0;
3692}
3693
3694static void __net_exit ip6_route_net_exit_late(struct net *net)
3695{
3696#ifdef CONFIG_PROC_FS
ece31ffd
G		 3697 remove_proc_entry("ipv6_route", net->proc_net);
3698 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3699#endif
3700}
3701
cdb18761
DL		 3702static struct pernet_operations ip6_route_net_ops = {
3703 .init = ip6_route_net_init,
3704 .exit = ip6_route_net_exit,
3705};
3706
c3426b47
DM		 3707static int __net_init ipv6_inetpeer_init(struct net *net)
3708{
3709 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3710
3711 if (!bp)
3712 return -ENOMEM;
3713 inet_peer_base_init(bp);
3714 net->ipv6.peers = bp;
3715 return 0;
3716}
3717
3718static void __net_exit ipv6_inetpeer_exit(struct net *net)
3719{
3720 struct inet_peer_base *bp = net->ipv6.peers;
3721
3722 net->ipv6.peers = NULL;
56a6b248 3723 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3724 kfree(bp);
3725}
3726
2b823f72 3727static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3728 .init = ipv6_inetpeer_init,
3729 .exit = ipv6_inetpeer_exit,
3730};
3731
d189634e
TG		 3732static struct pernet_operations ip6_route_net_late_ops = {
3733 .init = ip6_route_net_init_late,
3734 .exit = ip6_route_net_exit_late,
3735};
3736
8ed67789
DL		 3737static struct notifier_block ip6_route_dev_notifier = {
3738 .notifier_call = ip6_route_dev_notify,
3739 .priority = 0,
3740};
3741
433d49c3 3742int __init ip6_route_init(void)
1da177e4 3743{
433d49c3 3744 int ret;
8d0b94af 3745 int cpu;
433d49c3 3746
9a7ec3a9
DL		 3747 ret = -ENOMEM;
3748 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3749 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3750 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3751 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3752 goto out;
14e50e57 3753
fc66f95c 3754 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3755 if (ret)
bdb3289f 3756 goto out_kmem_cache;
bdb3289f 3757
c3426b47
DM		 3758 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3759 if (ret)
e8803b6c 3760 goto out_dst_entries;
2a0c451a 3761
7e52b33b
DM		 3762 ret = register_pernet_subsys(&ip6_route_net_ops);
3763 if (ret)
3764 goto out_register_inetpeer;
c3426b47 3765
5dc121e9
AE		 3766 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3767
8ed67789
DL		 3768 /* Registering of the loopback is done before this portion of code,
3769 * the loopback reference in rt6_info will not be taken, do it
3770 * manually for init_net */
d8d1f30b 3771 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3772 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3773 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3774 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3775 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3776 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3777 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3778 #endif
e8803b6c 3779 ret = fib6_init();
433d49c3 3780 if (ret)
8ed67789 3781 goto out_register_subsys;
433d49c3 3782
433d49c3
DL		 3783 ret = xfrm6_init();
3784 if (ret)
e8803b6c 3785 goto out_fib6_init;
c35b7e72 3786
433d49c3
DL		 3787 ret = fib6_rules_init();
3788 if (ret)
3789 goto xfrm6_init;
7e5449c2 3790
d189634e
TG		 3791 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3792 if (ret)
3793 goto fib6_rules_init;
3794
433d49c3 3795 ret = -ENOBUFS;
c7ac8679
GR		 3796 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3797 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3798 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3799 goto out_register_late_subsys;
c127ea2c 3800
8ed67789 3801 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3802 if (ret)
d189634e 3803 goto out_register_late_subsys;
8ed67789 3804
8d0b94af
MKL		 3805 for_each_possible_cpu(cpu) {
3806 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3807
3808 INIT_LIST_HEAD(&ul->head);
3809 spin_lock_init(&ul->lock);
3810 }
3811
433d49c3
DL		 3812out:
3813 return ret;
3814
d189634e
TG		 3815out_register_late_subsys:
3816 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3817fib6_rules_init:
433d49c3
DL		 3818 fib6_rules_cleanup();
3819xfrm6_init:
433d49c3 3820 xfrm6_fini();
2a0c451a
TG		 3821out_fib6_init:
3822 fib6_gc_cleanup();
8ed67789
DL		 3823out_register_subsys:
3824 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3825out_register_inetpeer:
3826 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3827out_dst_entries:
3828 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3829out_kmem_cache:
f2fc6a54 3830 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3831 goto out;
1da177e4
LT		 3832}
3833
3834void ip6_route_cleanup(void)
3835{
8ed67789 3836 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3837 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3838 fib6_rules_cleanup();
1da177e4 3839 xfrm6_fini();
1da177e4 3840 fib6_gc_cleanup();
c3426b47 3841 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3842 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3843 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3844 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3845}
Linux kernel - Deliverables
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