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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
[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
9ff74384
DA		 1045struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1046 int oif, struct flowi6 *fl6, int flags)
1da177e4 1047{
367efcb9 1048 struct fib6_node *fn, *saved_fn;
45e4fd26 1049 struct rt6_info *rt;
c71099ac 1050 int strict = 0;
1da177e4 1051
77d16f45 1052 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1055
c71099ac 1056 read_lock_bh(&table->tb6_lock);
1da177e4 1057
4c9483b2 1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1059 saved_fn = fn;
1da177e4 1060
ca254490
DA		 1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
a3c00e46 1064redo_rt6_select:
367efcb9 1065 rt = rt6_select(fn, oif, strict);
52bd4c0c 1066 if (rt->rt6i_nsiblings)
367efcb9 1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
367efcb9
MKL		 1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
367efcb9 1077 }
a3c00e46
MKL		 1078 }
1079
fb9de91e 1080
3da59bd9 1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
b811580d
DA		 1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
d52d3997 1088 return rt;
3da59bd9
MKL		 1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
d52d3997
MKL		 1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
3da59bd9
MKL		 1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
c71099ac 1104
3da59bd9 1105 if (uncached_rt)
8d0b94af 1106 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1109
3da59bd9 1110 dst_hold(&uncached_rt->dst);
b811580d
DA		 1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
3da59bd9 1113 return uncached_rt;
3da59bd9 1114
d52d3997
MKL		 1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1123
9c7370a1
MKL		 1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
a73e4195 1133 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1134 dst_release(&rt->dst);
1135 }
d52d3997 1136
b811580d 1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
d52d3997 1138 return pcpu_rt;
9c7370a1 1139
d52d3997 1140 }
1da177e4 1141}
9ff74384 1142EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 1143
8ed67789 1144static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1145 struct flowi6 *fl6, int flags)
4acad72d 1146{
4c9483b2 1147 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1148}
1149
72331bc0
SL		 1150static struct dst_entry *ip6_route_input_lookup(struct net *net,
1151 struct net_device *dev,
1152 struct flowi6 *fl6, int flags)
1153{
1154 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1155 flags |= RT6_LOOKUP_F_IFACE;
1156
1157 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1158}
1159
c71099ac
TG		 1160void ip6_route_input(struct sk_buff *skb)
1161{
b71d1d42 1162 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1163 struct net *net = dev_net(skb->dev);
adaa70bb 1164 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1165 struct ip_tunnel_info *tun_info;
4c9483b2 1166 struct flowi6 fl6 = {
ca254490 1167 .flowi6_iif = l3mdev_fib_oif(skb->dev),
4c9483b2
DM		 1168 .daddr = iph->daddr,
1169 .saddr = iph->saddr,
6502ca52 1170 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1171 .flowi6_mark = skb->mark,
1172 .flowi6_proto = iph->nexthdr,
c71099ac 1173 };
adaa70bb 1174
904af04d 1175 tun_info = skb_tunnel_info(skb);
46fa062a 1176 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1177 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1178 skb_dst_drop(skb);
72331bc0 1179 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1180}
1181
8ed67789 1182static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1183 struct flowi6 *fl6, int flags)
1da177e4 1184{
4c9483b2 1185 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1186}
1187
6f21c96a
PA		 1188struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1189 struct flowi6 *fl6, int flags)
c71099ac 1190{
ca254490 1191 struct dst_entry *dst;
d46a9d67 1192 bool any_src;
c71099ac 1193
4a65896f 1194 dst = l3mdev_get_rt6_dst(net, fl6);
ca254490
DA		 1195 if (dst)
1196 return dst;
1197
1fb9489b 1198 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1199
d46a9d67 1200 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1201 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1202 (fl6->flowi6_oif && any_src))
77d16f45 1203 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1204
d46a9d67 1205 if (!any_src)
adaa70bb 1206 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1207 else if (sk)
1208 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1209
4c9483b2 1210 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1211}
6f21c96a 1212EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 1213
2774c131 1214struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1215{
5c1e6aa3 1216 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1217 struct dst_entry *new = NULL;
1218
f5b0a874 1219 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1220 if (rt) {
0a1f5962 1221 rt6_info_init(rt);
8104891b 1222
0a1f5962 1223 new = &rt->dst;
14e50e57 1224 new->__use = 1;
352e512c 1225 new->input = dst_discard;
ede2059d 1226 new->output = dst_discard_out;
14e50e57 1227
0a1f5962 1228 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1229 rt->rt6i_idev = ort->rt6i_idev;
1230 if (rt->rt6i_idev)
1231 in6_dev_hold(rt->rt6i_idev);
14e50e57 1232
4e3fd7a0 1233 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1234 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1235 rt->rt6i_metric = 0;
1236
1237 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1238#ifdef CONFIG_IPV6_SUBTREES
1239 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1240#endif
1241
1242 dst_free(new);
1243 }
1244
69ead7af
DM		 1245 dst_release(dst_orig);
1246 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1247}
14e50e57 1248
1da177e4
LT		 1249/*
1250 * Destination cache support functions
1251 */
1252
4b32b5ad
MKL		 1253static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1254{
1255 if (rt->dst.from &&
1256 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1257 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1258}
1259
3da59bd9
MKL		 1260static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1261{
1262 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1263 return NULL;
1264
1265 if (rt6_check_expired(rt))
1266 return NULL;
1267
1268 return &rt->dst;
1269}
1270
1271static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1272{
5973fb1e
MKL		 1273 if (!__rt6_check_expired(rt) &&
1274 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
3da59bd9
MKL		 1275 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1276 return &rt->dst;
1277 else
1278 return NULL;
1279}
1280
1da177e4
LT		 1281static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1282{
1283 struct rt6_info *rt;
1284
1285 rt = (struct rt6_info *) dst;
1286
6f3118b5
ND		 1287 /* All IPV6 dsts are created with ->obsolete set to the value
1288 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1289 * into this function always.
1290 */
e3bc10bd 1291
4b32b5ad
MKL		 1292 rt6_dst_from_metrics_check(rt);
1293
02bcf4e0
MKL		 1294 if (rt->rt6i_flags & RTF_PCPU ||
1295 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
3da59bd9
MKL		 1296 return rt6_dst_from_check(rt, cookie);
1297 else
1298 return rt6_check(rt, cookie);
1da177e4
LT		 1299}
1300
1301static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1302{
1303 struct rt6_info *rt = (struct rt6_info *) dst;
1304
1305 if (rt) {
54c1a859
YH		 1306 if (rt->rt6i_flags & RTF_CACHE) {
1307 if (rt6_check_expired(rt)) {
1308 ip6_del_rt(rt);
1309 dst = NULL;
1310 }
1311 } else {
1da177e4 1312 dst_release(dst);
54c1a859
YH		 1313 dst = NULL;
1314 }
1da177e4 1315 }
54c1a859 1316 return dst;
1da177e4
LT		 1317}
1318
1319static void ip6_link_failure(struct sk_buff *skb)
1320{
1321 struct rt6_info *rt;
1322
3ffe533c 1323 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1324
adf30907 1325 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1326 if (rt) {
1eb4f758
HFS		 1327 if (rt->rt6i_flags & RTF_CACHE) {
1328 dst_hold(&rt->dst);
8e3d5be7 1329 ip6_del_rt(rt);
1eb4f758 1330 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1331 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1332 }
1da177e4
LT		 1333 }
1334}
1335
45e4fd26
MKL		 1336static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1337{
1338 struct net *net = dev_net(rt->dst.dev);
1339
1340 rt->rt6i_flags |= RTF_MODIFIED;
1341 rt->rt6i_pmtu = mtu;
1342 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1343}
1344
0d3f6d29
MKL		 1345static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1346{
1347 return !(rt->rt6i_flags & RTF_CACHE) &&
1348 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1349}
1350
45e4fd26
MKL		 1351static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1352 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1353{
67ba4152 1354 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1355
45e4fd26
MKL		 1356 if (rt6->rt6i_flags & RTF_LOCAL)
1357 return;
81aded24 1358
45e4fd26
MKL		 1359 dst_confirm(dst);
1360 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1361 if (mtu >= dst_mtu(dst))
1362 return;
9d289715 1363
0d3f6d29 1364 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26
MKL		 1365 rt6_do_update_pmtu(rt6, mtu);
1366 } else {
1367 const struct in6_addr *daddr, *saddr;
1368 struct rt6_info *nrt6;
1369
1370 if (iph) {
1371 daddr = &iph->daddr;
1372 saddr = &iph->saddr;
1373 } else if (sk) {
1374 daddr = &sk->sk_v6_daddr;
1375 saddr = &inet6_sk(sk)->saddr;
1376 } else {
1377 return;
1378 }
1379 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1380 if (nrt6) {
1381 rt6_do_update_pmtu(nrt6, mtu);
1382
1383 /* ip6_ins_rt(nrt6) will bump the
1384 * rt6->rt6i_node->fn_sernum
1385 * which will fail the next rt6_check() and
1386 * invalidate the sk->sk_dst_cache.
1387 */
1388 ip6_ins_rt(nrt6);
1389 }
1da177e4
LT		 1390 }
1391}
1392
45e4fd26
MKL		 1393static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1394 struct sk_buff *skb, u32 mtu)
1395{
1396 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1397}
1398
42ae66c8
DM		 1399void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1400 int oif, u32 mark)
81aded24
DM		 1401{
1402 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1403 struct dst_entry *dst;
1404 struct flowi6 fl6;
1405
1406 memset(&fl6, 0, sizeof(fl6));
1407 fl6.flowi6_oif = oif;
1b3c61dc 1408 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1409 fl6.daddr = iph->daddr;
1410 fl6.saddr = iph->saddr;
6502ca52 1411 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1412
1413 dst = ip6_route_output(net, NULL, &fl6);
1414 if (!dst->error)
45e4fd26 1415 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1416 dst_release(dst);
1417}
1418EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1419
1420void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1421{
33c162a9
MKL		 1422 struct dst_entry *dst;
1423
81aded24
DM		 1424 ip6_update_pmtu(skb, sock_net(sk), mtu,
1425 sk->sk_bound_dev_if, sk->sk_mark);
33c162a9
MKL		 1426
1427 dst = __sk_dst_get(sk);
1428 if (!dst || !dst->obsolete ||
1429 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1430 return;
1431
1432 bh_lock_sock(sk);
1433 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1434 ip6_datagram_dst_update(sk, false);
1435 bh_unlock_sock(sk);
81aded24
DM		 1436}
1437EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1438
b55b76b2
DJ		 1439/* Handle redirects */
1440struct ip6rd_flowi {
1441 struct flowi6 fl6;
1442 struct in6_addr gateway;
1443};
1444
1445static struct rt6_info *__ip6_route_redirect(struct net *net,
1446 struct fib6_table *table,
1447 struct flowi6 *fl6,
1448 int flags)
1449{
1450 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1451 struct rt6_info *rt;
1452 struct fib6_node *fn;
1453
1454 /* Get the "current" route for this destination and
1455 * check if the redirect has come from approriate router.
1456 *
1457 * RFC 4861 specifies that redirects should only be
1458 * accepted if they come from the nexthop to the target.
1459 * Due to the way the routes are chosen, this notion
1460 * is a bit fuzzy and one might need to check all possible
1461 * routes.
1462 */
1463
1464 read_lock_bh(&table->tb6_lock);
1465 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1466restart:
1467 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1468 if (rt6_check_expired(rt))
1469 continue;
1470 if (rt->dst.error)
1471 break;
1472 if (!(rt->rt6i_flags & RTF_GATEWAY))
1473 continue;
1474 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1475 continue;
1476 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1477 continue;
1478 break;
1479 }
1480
1481 if (!rt)
1482 rt = net->ipv6.ip6_null_entry;
1483 else if (rt->dst.error) {
1484 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1485 goto out;
1486 }
1487
1488 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1489 fn = fib6_backtrack(fn, &fl6->saddr);
1490 if (fn)
1491 goto restart;
b55b76b2 1492 }
a3c00e46 1493
b0a1ba59 1494out:
b55b76b2
DJ		 1495 dst_hold(&rt->dst);
1496
1497 read_unlock_bh(&table->tb6_lock);
1498
b811580d 1499 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
b55b76b2
DJ		 1500 return rt;
1501};
1502
1503static struct dst_entry *ip6_route_redirect(struct net *net,
1504 const struct flowi6 *fl6,
1505 const struct in6_addr *gateway)
1506{
1507 int flags = RT6_LOOKUP_F_HAS_SADDR;
1508 struct ip6rd_flowi rdfl;
1509
1510 rdfl.fl6 = *fl6;
1511 rdfl.gateway = *gateway;
1512
1513 return fib6_rule_lookup(net, &rdfl.fl6,
1514 flags, __ip6_route_redirect);
1515}
1516
3a5ad2ee
DM		 1517void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1518{
1519 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1520 struct dst_entry *dst;
1521 struct flowi6 fl6;
1522
1523 memset(&fl6, 0, sizeof(fl6));
e374c618 1524 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1525 fl6.flowi6_oif = oif;
1526 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1527 fl6.daddr = iph->daddr;
1528 fl6.saddr = iph->saddr;
6502ca52 1529 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1530
b55b76b2
DJ		 1531 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1532 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1533 dst_release(dst);
1534}
1535EXPORT_SYMBOL_GPL(ip6_redirect);
1536
c92a59ec
DJ		 1537void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1538 u32 mark)
1539{
1540 const struct ipv6hdr *iph = ipv6_hdr(skb);
1541 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1542 struct dst_entry *dst;
1543 struct flowi6 fl6;
1544
1545 memset(&fl6, 0, sizeof(fl6));
e374c618 1546 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1547 fl6.flowi6_oif = oif;
1548 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1549 fl6.daddr = msg->dest;
1550 fl6.saddr = iph->daddr;
1551
b55b76b2
DJ		 1552 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1553 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1554 dst_release(dst);
1555}
1556
3a5ad2ee
DM		 1557void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1558{
1559 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1560}
1561EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1562
0dbaee3b 1563static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1564{
0dbaee3b
DM		 1565 struct net_device *dev = dst->dev;
1566 unsigned int mtu = dst_mtu(dst);
1567 struct net *net = dev_net(dev);
1568
1da177e4
LT		 1569 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1570
5578689a
DL		 1571 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1572 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1573
1574 /*
1ab1457c
YH		 1575 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1576 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1577 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1578 * rely only on pmtu discovery"
1579 */
1580 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1581 mtu = IPV6_MAXPLEN;
1582 return mtu;
1583}
1584
ebb762f2 1585static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1586{
4b32b5ad
MKL		 1587 const struct rt6_info *rt = (const struct rt6_info *)dst;
1588 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1589 struct inet6_dev *idev;
618f9bc7 1590
4b32b5ad
MKL		 1591 if (mtu)
1592 goto out;
1593
1594 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1595 if (mtu)
30f78d8e 1596 goto out;
618f9bc7
SK		 1597
1598 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1599
1600 rcu_read_lock();
1601 idev = __in6_dev_get(dst->dev);
1602 if (idev)
1603 mtu = idev->cnf.mtu6;
1604 rcu_read_unlock();
1605
30f78d8e
ED		 1606out:
1607 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1608}
1609
3b00944c
YH		 1610static struct dst_entry *icmp6_dst_gc_list;
1611static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1612
3b00944c 1613struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1614 struct flowi6 *fl6)
1da177e4 1615{
87a11578 1616 struct dst_entry *dst;
1da177e4
LT		 1617 struct rt6_info *rt;
1618 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1619 struct net *net = dev_net(dev);
1da177e4 1620
38308473 1621 if (unlikely(!idev))
122bdf67 1622 return ERR_PTR(-ENODEV);
1da177e4 1623
ad706862 1624 rt = ip6_dst_alloc(net, dev, 0);
38308473 1625 if (unlikely(!rt)) {
1da177e4 1626 in6_dev_put(idev);
87a11578 1627 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1628 goto out;
1629 }
1630
8e2ec639
YZ		 1631 rt->dst.flags |= DST_HOST;
1632 rt->dst.output = ip6_output;
d8d1f30b 1633 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1634 rt->rt6i_gateway = fl6->daddr;
87a11578 1635 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1636 rt->rt6i_dst.plen = 128;
1637 rt->rt6i_idev = idev;
14edd87d 1638 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1639
3b00944c 1640 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1641 rt->dst.next = icmp6_dst_gc_list;
1642 icmp6_dst_gc_list = &rt->dst;
3b00944c 1643 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1644
5578689a 1645 fib6_force_start_gc(net);
1da177e4 1646
87a11578
DM		 1647 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1648
1da177e4 1649out:
87a11578 1650 return dst;
1da177e4
LT		 1651}
1652
3d0f24a7 1653int icmp6_dst_gc(void)
1da177e4 1654{
e9476e95 1655 struct dst_entry *dst, **pprev;
3d0f24a7 1656 int more = 0;
1da177e4 1657
3b00944c
YH		 1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1660
1da177e4
LT		 1661 while ((dst = *pprev) != NULL) {
1662 if (!atomic_read(&dst->__refcnt)) {
1663 *pprev = dst->next;
1664 dst_free(dst);
1da177e4
LT		 1665 } else {
1666 pprev = &dst->next;
3d0f24a7 1667 ++more;
1da177e4
LT		 1668 }
1669 }
1670
3b00944c 1671 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1672
3d0f24a7 1673 return more;
1da177e4
LT		 1674}
1675
1e493d19
DM		 1676static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1677 void *arg)
1678{
1679 struct dst_entry *dst, **pprev;
1680
1681 spin_lock_bh(&icmp6_dst_lock);
1682 pprev = &icmp6_dst_gc_list;
1683 while ((dst = *pprev) != NULL) {
1684 struct rt6_info *rt = (struct rt6_info *) dst;
1685 if (func(rt, arg)) {
1686 *pprev = dst->next;
1687 dst_free(dst);
1688 } else {
1689 pprev = &dst->next;
1690 }
1691 }
1692 spin_unlock_bh(&icmp6_dst_lock);
1693}
1694
569d3645 1695static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1696{
86393e52 1697 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1698 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1699 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1700 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1701 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1702 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1703 int entries;
7019b78e 1704
fc66f95c 1705 entries = dst_entries_get_fast(ops);
49a18d86 1706 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1707 entries <= rt_max_size)
1da177e4
LT		 1708 goto out;
1709
6891a346 1710 net->ipv6.ip6_rt_gc_expire++;
14956643 1711 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1712 entries = dst_entries_get_slow(ops);
1713 if (entries < ops->gc_thresh)
7019b78e 1714 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1715out:
7019b78e 1716 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1717 return entries > rt_max_size;
1da177e4
LT		 1718}
1719
e715b6d3
FW		 1720static int ip6_convert_metrics(struct mx6_config *mxc,
1721 const struct fib6_config *cfg)
1722{
c3a8d947 1723 bool ecn_ca = false;
e715b6d3
FW		 1724 struct nlattr *nla;
1725 int remaining;
1726 u32 *mp;
1727
63159f29 1728 if (!cfg->fc_mx)
e715b6d3
FW		 1729 return 0;
1730
1731 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1732 if (unlikely(!mp))
1733 return -ENOMEM;
1734
1735 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1736 int type = nla_type(nla);
1bb14807 1737 u32 val;
e715b6d3 1738
1bb14807
DB		 1739 if (!type)
1740 continue;
1741 if (unlikely(type > RTAX_MAX))
1742 goto err;
ea697639 1743
1bb14807
DB		 1744 if (type == RTAX_CC_ALGO) {
1745 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1746
1bb14807 1747 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1748 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1749 if (val == TCP_CA_UNSPEC)
1750 goto err;
1751 } else {
1752 val = nla_get_u32(nla);
e715b6d3 1753 }
626abd59
PA		 1754 if (type == RTAX_HOPLIMIT && val > 255)
1755 val = 255;
b8d3e416
DB		 1756 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1757 goto err;
1bb14807
DB		 1758
1759 mp[type - 1] = val;
1760 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1761 }
1762
c3a8d947
DB		 1763 if (ecn_ca) {
1764 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1765 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1766 }
e715b6d3 1767
c3a8d947 1768 mxc->mx = mp;
e715b6d3
FW		 1769 return 0;
1770 err:
1771 kfree(mp);
1772 return -EINVAL;
1773}
1da177e4 1774
8c14586f
DA		 1775static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1776 struct fib6_config *cfg,
1777 const struct in6_addr *gw_addr)
1778{
1779 struct flowi6 fl6 = {
1780 .flowi6_oif = cfg->fc_ifindex,
1781 .daddr = *gw_addr,
1782 .saddr = cfg->fc_prefsrc,
1783 };
1784 struct fib6_table *table;
1785 struct rt6_info *rt;
48f1dcb5 1786 int flags = RT6_LOOKUP_F_IFACE;
8c14586f
DA		 1787
1788 table = fib6_get_table(net, cfg->fc_table);
1789 if (!table)
1790 return NULL;
1791
1792 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1793 flags |= RT6_LOOKUP_F_HAS_SADDR;
1794
1795 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1796
1797 /* if table lookup failed, fall back to full lookup */
1798 if (rt == net->ipv6.ip6_null_entry) {
1799 ip6_rt_put(rt);
1800 rt = NULL;
1801 }
1802
1803 return rt;
1804}
1805
8c5b83f0 1806static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1807{
5578689a 1808 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1809 struct rt6_info *rt = NULL;
1810 struct net_device *dev = NULL;
1811 struct inet6_dev *idev = NULL;
c71099ac 1812 struct fib6_table *table;
1da177e4 1813 int addr_type;
8c5b83f0 1814 int err = -EINVAL;
1da177e4 1815
86872cb5 1816 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1817 goto out;
1da177e4 1818#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1819 if (cfg->fc_src_len)
8c5b83f0 1820 goto out;
1da177e4 1821#endif
86872cb5 1822 if (cfg->fc_ifindex) {
1da177e4 1823 err = -ENODEV;
5578689a 1824 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1825 if (!dev)
1826 goto out;
1827 idev = in6_dev_get(dev);
1828 if (!idev)
1829 goto out;
1830 }
1831
86872cb5
TG		 1832 if (cfg->fc_metric == 0)
1833 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1834
d71314b4 1835 err = -ENOBUFS;
38308473
DM		 1836 if (cfg->fc_nlinfo.nlh &&
1837 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1838 table = fib6_get_table(net, cfg->fc_table);
38308473 1839 if (!table) {
f3213831 1840 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1841 table = fib6_new_table(net, cfg->fc_table);
1842 }
1843 } else {
1844 table = fib6_new_table(net, cfg->fc_table);
1845 }
38308473
DM		 1846
1847 if (!table)
c71099ac 1848 goto out;
c71099ac 1849
ad706862
MKL		 1850 rt = ip6_dst_alloc(net, NULL,
1851 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1852
38308473 1853 if (!rt) {
1da177e4
LT		 1854 err = -ENOMEM;
1855 goto out;
1856 }
1857
1716a961
G		 1858 if (cfg->fc_flags & RTF_EXPIRES)
1859 rt6_set_expires(rt, jiffies +
1860 clock_t_to_jiffies(cfg->fc_expires));
1861 else
1862 rt6_clean_expires(rt);
1da177e4 1863
86872cb5
TG		 1864 if (cfg->fc_protocol == RTPROT_UNSPEC)
1865 cfg->fc_protocol = RTPROT_BOOT;
1866 rt->rt6i_protocol = cfg->fc_protocol;
1867
1868 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1869
1870 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1871 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1872 else if (cfg->fc_flags & RTF_LOCAL)
1873 rt->dst.input = ip6_input;
1da177e4 1874 else
d8d1f30b 1875 rt->dst.input = ip6_forward;
1da177e4 1876
d8d1f30b 1877 rt->dst.output = ip6_output;
1da177e4 1878
19e42e45
RP		 1879 if (cfg->fc_encap) {
1880 struct lwtunnel_state *lwtstate;
1881
1882 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1883 cfg->fc_encap, AF_INET6, cfg,
1884 &lwtstate);
19e42e45
RP		 1885 if (err)
1886 goto out;
61adedf3
JB		 1887 rt->dst.lwtstate = lwtstate_get(lwtstate);
1888 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1889 rt->dst.lwtstate->orig_output = rt->dst.output;
1890 rt->dst.output = lwtunnel_output;
25368623 1891 }
61adedf3
JB		 1892 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1893 rt->dst.lwtstate->orig_input = rt->dst.input;
1894 rt->dst.input = lwtunnel_input;
25368623 1895 }
19e42e45
RP		 1896 }
1897
86872cb5
TG		 1898 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1899 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1900 if (rt->rt6i_dst.plen == 128)
e5fd387a 1901 rt->dst.flags |= DST_HOST;
e5fd387a 1902
1da177e4 1903#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1904 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1905 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1906#endif
1907
86872cb5 1908 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1909
1910 /* We cannot add true routes via loopback here,
1911 they would result in kernel looping; promote them to reject routes
1912 */
86872cb5 1913 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1914 (dev && (dev->flags & IFF_LOOPBACK) &&
1915 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1916 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1917 /* hold loopback dev/idev if we haven't done so. */
5578689a 1918 if (dev != net->loopback_dev) {
1da177e4
LT		 1919 if (dev) {
1920 dev_put(dev);
1921 in6_dev_put(idev);
1922 }
5578689a 1923 dev = net->loopback_dev;
1da177e4
LT		 1924 dev_hold(dev);
1925 idev = in6_dev_get(dev);
1926 if (!idev) {
1927 err = -ENODEV;
1928 goto out;
1929 }
1930 }
1da177e4 1931 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1932 switch (cfg->fc_type) {
1933 case RTN_BLACKHOLE:
1934 rt->dst.error = -EINVAL;
ede2059d 1935 rt->dst.output = dst_discard_out;
7150aede 1936 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1937 break;
1938 case RTN_PROHIBIT:
1939 rt->dst.error = -EACCES;
7150aede
K		 1940 rt->dst.output = ip6_pkt_prohibit_out;
1941 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1942 break;
b4949ab2 1943 case RTN_THROW:
0315e382 1944 case RTN_UNREACHABLE:
ef2c7d7b 1945 default:
7150aede 1946 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1947 : (cfg->fc_type == RTN_UNREACHABLE)
1948 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1949 rt->dst.output = ip6_pkt_discard_out;
1950 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1951 break;
1952 }
1da177e4
LT		 1953 goto install_route;
1954 }
1955
86872cb5 1956 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1957 const struct in6_addr *gw_addr;
1da177e4
LT		 1958 int gwa_type;
1959
86872cb5 1960 gw_addr = &cfg->fc_gateway;
330567b7 1961 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1962
1963 /* if gw_addr is local we will fail to detect this in case
1964 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1965 * will return already-added prefix route via interface that
1966 * prefix route was assigned to, which might be non-loopback.
1967 */
1968 err = -EINVAL;
330567b7
FW		 1969 if (ipv6_chk_addr_and_flags(net, gw_addr,
1970 gwa_type & IPV6_ADDR_LINKLOCAL ?
1971 dev : NULL, 0, 0))
48ed7b26
FW		 1972 goto out;
1973
4e3fd7a0 1974 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1975
1976 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
8c14586f 1977 struct rt6_info *grt = NULL;
1da177e4
LT		 1978
1979 /* IPv6 strictly inhibits using not link-local
1980 addresses as nexthop address.
1981 Otherwise, router will not able to send redirects.
1982 It is very good, but in some (rare!) circumstances
1983 (SIT, PtP, NBMA NOARP links) it is handy to allow
1984 some exceptions. --ANK
1985 */
38308473 1986 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1987 goto out;
1988
a435a07f 1989 if (cfg->fc_table) {
8c14586f
DA		 1990 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1991
a435a07f
VB		 1992 if (grt) {
1993 if (grt->rt6i_flags & RTF_GATEWAY ||
1994 (dev && dev != grt->dst.dev)) {
1995 ip6_rt_put(grt);
1996 grt = NULL;
1997 }
1998 }
1999 }
2000
8c14586f
DA		 2001 if (!grt)
2002 grt = rt6_lookup(net, gw_addr, NULL,
2003 cfg->fc_ifindex, 1);
1da177e4
LT		 2004
2005 err = -EHOSTUNREACH;
38308473 2006 if (!grt)
1da177e4
LT		 2007 goto out;
2008 if (dev) {
d1918542 2009 if (dev != grt->dst.dev) {
94e187c0 2010 ip6_rt_put(grt);
1da177e4
LT		 2011 goto out;
2012 }
2013 } else {
d1918542 2014 dev = grt->dst.dev;
1da177e4
LT		 2015 idev = grt->rt6i_idev;
2016 dev_hold(dev);
2017 in6_dev_hold(grt->rt6i_idev);
2018 }
38308473 2019 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 2020 err = 0;
94e187c0 2021 ip6_rt_put(grt);
1da177e4
LT		 2022
2023 if (err)
2024 goto out;
2025 }
2026 err = -EINVAL;
38308473 2027 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2028 goto out;
2029 }
2030
2031 err = -ENODEV;
38308473 2032 if (!dev)
1da177e4
LT		 2033 goto out;
2034
c3968a85
DW		 2035 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2036 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2037 err = -EINVAL;
2038 goto out;
2039 }
4e3fd7a0 2040 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 2041 rt->rt6i_prefsrc.plen = 128;
2042 } else
2043 rt->rt6i_prefsrc.plen = 0;
2044
86872cb5 2045 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2046
2047install_route:
d8d1f30b 2048 rt->dst.dev = dev;
1da177e4 2049 rt->rt6i_idev = idev;
c71099ac 2050 rt->rt6i_table = table;
63152fc0 2051
c346dca1 2052 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2053
8c5b83f0 2054 return rt;
6b9ea5a6
RP		 2055out:
2056 if (dev)
2057 dev_put(dev);
2058 if (idev)
2059 in6_dev_put(idev);
2060 if (rt)
2061 dst_free(&rt->dst);
2062
8c5b83f0 2063 return ERR_PTR(err);
6b9ea5a6
RP		 2064}
2065
2066int ip6_route_add(struct fib6_config *cfg)
2067{
2068 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2069 struct rt6_info *rt;
6b9ea5a6
RP		 2070 int err;
2071
8c5b83f0
RP		 2072 rt = ip6_route_info_create(cfg);
2073 if (IS_ERR(rt)) {
2074 err = PTR_ERR(rt);
2075 rt = NULL;
6b9ea5a6 2076 goto out;
8c5b83f0 2077 }
6b9ea5a6 2078
e715b6d3
FW		 2079 err = ip6_convert_metrics(&mxc, cfg);
2080 if (err)
2081 goto out;
1da177e4 2082
e715b6d3
FW		 2083 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2084
2085 kfree(mxc.mx);
6b9ea5a6 2086
e715b6d3 2087 return err;
1da177e4 2088out:
1da177e4 2089 if (rt)
d8d1f30b 2090 dst_free(&rt->dst);
6b9ea5a6 2091
1da177e4
LT		 2092 return err;
2093}
2094
86872cb5 2095static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2096{
2097 int err;
c71099ac 2098 struct fib6_table *table;
d1918542 2099 struct net *net = dev_net(rt->dst.dev);
1da177e4 2100
8e3d5be7
MKL		 2101 if (rt == net->ipv6.ip6_null_entry ||
2102 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2103 err = -ENOENT;
2104 goto out;
2105 }
6c813a72 2106
c71099ac
TG		 2107 table = rt->rt6i_table;
2108 write_lock_bh(&table->tb6_lock);
86872cb5 2109 err = fib6_del(rt, info);
c71099ac 2110 write_unlock_bh(&table->tb6_lock);
1da177e4 2111
6825a26c 2112out:
94e187c0 2113 ip6_rt_put(rt);
1da177e4
LT		 2114 return err;
2115}
2116
e0a1ad73
TG		 2117int ip6_del_rt(struct rt6_info *rt)
2118{
4d1169c1 2119 struct nl_info info = {
d1918542 2120 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2121 };
528c4ceb 2122 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2123}
2124
86872cb5 2125static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2126{
c71099ac 2127 struct fib6_table *table;
1da177e4
LT		 2128 struct fib6_node *fn;
2129 struct rt6_info *rt;
2130 int err = -ESRCH;
2131
5578689a 2132 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2133 if (!table)
c71099ac
TG		 2134 return err;
2135
2136 read_lock_bh(&table->tb6_lock);
1da177e4 2137
c71099ac 2138 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2139 &cfg->fc_dst, cfg->fc_dst_len,
2140 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2141
1da177e4 2142 if (fn) {
d8d1f30b 2143 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2144 if ((rt->rt6i_flags & RTF_CACHE) &&
2145 !(cfg->fc_flags & RTF_CACHE))
2146 continue;
86872cb5 2147 if (cfg->fc_ifindex &&
d1918542
DM		 2148 (!rt->dst.dev ||
2149 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2150 continue;
86872cb5
TG		 2151 if (cfg->fc_flags & RTF_GATEWAY &&
2152 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2153 continue;
86872cb5 2154 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2155 continue;
d8d1f30b 2156 dst_hold(&rt->dst);
c71099ac 2157 read_unlock_bh(&table->tb6_lock);
1da177e4 2158
86872cb5 2159 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2160 }
2161 }
c71099ac 2162 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2163
2164 return err;
2165}
2166
6700c270 2167static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2168{
a6279458 2169 struct netevent_redirect netevent;
e8599ff4 2170 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2171 struct ndisc_options ndopts;
2172 struct inet6_dev *in6_dev;
2173 struct neighbour *neigh;
71bcdba0 2174 struct rd_msg *msg;
6e157b6a
DM		 2175 int optlen, on_link;
2176 u8 *lladdr;
e8599ff4 2177
29a3cad5 2178 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2179 optlen -= sizeof(*msg);
e8599ff4
DM		 2180
2181 if (optlen < 0) {
6e157b6a 2182 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2183 return;
2184 }
2185
71bcdba0 2186 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2187
71bcdba0 2188 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2189 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2190 return;
2191 }
2192
6e157b6a 2193 on_link = 0;
71bcdba0 2194 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2195 on_link = 1;
71bcdba0 2196 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2197 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2198 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2199 return;
2200 }
2201
2202 in6_dev = __in6_dev_get(skb->dev);
2203 if (!in6_dev)
2204 return;
2205 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2206 return;
2207
2208 /* RFC2461 8.1:
2209 * The IP source address of the Redirect MUST be the same as the current
2210 * first-hop router for the specified ICMP Destination Address.
2211 */
2212
f997c55c 2213 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2214 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2215 return;
2216 }
6e157b6a
DM		 2217
2218 lladdr = NULL;
e8599ff4
DM		 2219 if (ndopts.nd_opts_tgt_lladdr) {
2220 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2221 skb->dev);
2222 if (!lladdr) {
2223 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2224 return;
2225 }
2226 }
2227
6e157b6a 2228 rt = (struct rt6_info *) dst;
ec13ad1d 2229 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2230 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2231 return;
6e157b6a 2232 }
e8599ff4 2233
6e157b6a
DM		 2234 /* Redirect received -> path was valid.
2235 * Look, redirects are sent only in response to data packets,
2236 * so that this nexthop apparently is reachable. --ANK
2237 */
2238 dst_confirm(&rt->dst);
a6279458 2239
71bcdba0 2240 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2241 if (!neigh)
2242 return;
a6279458 2243
1da177e4
LT		 2244 /*
2245 * We have finally decided to accept it.
2246 */
2247
f997c55c 2248 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 2249 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2250 NEIGH_UPDATE_F_OVERRIDE|
2251 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 2252 NEIGH_UPDATE_F_ISROUTER)),
2253 NDISC_REDIRECT, &ndopts);
1da177e4 2254
83a09abd 2255 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2256 if (!nrt)
1da177e4
LT		 2257 goto out;
2258
2259 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2260 if (on_link)
2261 nrt->rt6i_flags &= ~RTF_GATEWAY;
2262
4e3fd7a0 2263 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2264
40e22e8f 2265 if (ip6_ins_rt(nrt))
1da177e4
LT		 2266 goto out;
2267
d8d1f30b
CG		 2268 netevent.old = &rt->dst;
2269 netevent.new = &nrt->dst;
71bcdba0 2270 netevent.daddr = &msg->dest;
60592833 2271 netevent.neigh = neigh;
8d71740c
TT		 2272 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2273
38308473 2274 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2275 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2276 ip6_del_rt(rt);
1da177e4
LT		 2277 }
2278
2279out:
e8599ff4 2280 neigh_release(neigh);
6e157b6a
DM		 2281}
2282
1da177e4
LT		 2283/*
2284 * Misc support functions
2285 */
2286
4b32b5ad
MKL		 2287static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2288{
2289 BUG_ON(from->dst.from);
2290
2291 rt->rt6i_flags &= ~RTF_EXPIRES;
2292 dst_hold(&from->dst);
2293 rt->dst.from = &from->dst;
2294 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2295}
2296
83a09abd
MKL		 2297static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2298{
2299 rt->dst.input = ort->dst.input;
2300 rt->dst.output = ort->dst.output;
2301 rt->rt6i_dst = ort->rt6i_dst;
2302 rt->dst.error = ort->dst.error;
2303 rt->rt6i_idev = ort->rt6i_idev;
2304 if (rt->rt6i_idev)
2305 in6_dev_hold(rt->rt6i_idev);
2306 rt->dst.lastuse = jiffies;
2307 rt->rt6i_gateway = ort->rt6i_gateway;
2308 rt->rt6i_flags = ort->rt6i_flags;
2309 rt6_set_from(rt, ort);
2310 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2311#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2312 rt->rt6i_src = ort->rt6i_src;
1da177e4 2313#endif
83a09abd
MKL		 2314 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2315 rt->rt6i_table = ort->rt6i_table;
61adedf3 2316 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2317}
2318
70ceb4f5 2319#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2320static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2321 const struct in6_addr *prefix, int prefixlen,
2322 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2323{
2324 struct fib6_node *fn;
2325 struct rt6_info *rt = NULL;
c71099ac
TG		 2326 struct fib6_table *table;
2327
efa2cea0 2328 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2329 if (!table)
c71099ac 2330 return NULL;
70ceb4f5 2331
5744dd9b 2332 read_lock_bh(&table->tb6_lock);
67ba4152 2333 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2334 if (!fn)
2335 goto out;
2336
d8d1f30b 2337 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2338 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2339 continue;
2340 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2341 continue;
2342 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2343 continue;
d8d1f30b 2344 dst_hold(&rt->dst);
70ceb4f5
YH		 2345 break;
2346 }
2347out:
5744dd9b 2348 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2349 return rt;
2350}
2351
efa2cea0 2352static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2353 const struct in6_addr *prefix, int prefixlen,
2354 const struct in6_addr *gwaddr, int ifindex,
95c96174 2355 unsigned int pref)
70ceb4f5 2356{
86872cb5 2357 struct fib6_config cfg = {
238fc7ea 2358 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2359 .fc_ifindex = ifindex,
2360 .fc_dst_len = prefixlen,
2361 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2362 RTF_UP | RTF_PREF(pref),
15e47304 2363 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2364 .fc_nlinfo.nlh = NULL,
2365 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2366 };
2367
ca254490 2368 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2369 cfg.fc_dst = *prefix;
2370 cfg.fc_gateway = *gwaddr;
70ceb4f5 2371
e317da96
YH		 2372 /* We should treat it as a default route if prefix length is 0. */
2373 if (!prefixlen)
86872cb5 2374 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2375
86872cb5 2376 ip6_route_add(&cfg);
70ceb4f5 2377
efa2cea0 2378 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2379}
2380#endif
2381
b71d1d42 2382struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2383{
1da177e4 2384 struct rt6_info *rt;
c71099ac 2385 struct fib6_table *table;
1da177e4 2386
c346dca1 2387 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2388 if (!table)
c71099ac 2389 return NULL;
1da177e4 2390
5744dd9b 2391 read_lock_bh(&table->tb6_lock);
67ba4152 2392 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2393 if (dev == rt->dst.dev &&
045927ff 2394 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2395 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2396 break;
2397 }
2398 if (rt)
d8d1f30b 2399 dst_hold(&rt->dst);
5744dd9b 2400 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2401 return rt;
2402}
2403
b71d1d42 2404struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2405 struct net_device *dev,
2406 unsigned int pref)
1da177e4 2407{
86872cb5 2408 struct fib6_config cfg = {
ca254490 2409 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2410 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2411 .fc_ifindex = dev->ifindex,
2412 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2413 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2414 .fc_nlinfo.portid = 0,
5578689a 2415 .fc_nlinfo.nlh = NULL,
c346dca1 2416 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2417 };
1da177e4 2418
4e3fd7a0 2419 cfg.fc_gateway = *gwaddr;
1da177e4 2420
86872cb5 2421 ip6_route_add(&cfg);
1da177e4 2422
1da177e4
LT		 2423 return rt6_get_dflt_router(gwaddr, dev);
2424}
2425
7b4da532 2426void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2427{
2428 struct rt6_info *rt;
c71099ac
TG		 2429 struct fib6_table *table;
2430
2431 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2432 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2433 if (!table)
c71099ac 2434 return;
1da177e4
LT		 2435
2436restart:
c71099ac 2437 read_lock_bh(&table->tb6_lock);
d8d1f30b 2438 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2439 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2440 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2441 dst_hold(&rt->dst);
c71099ac 2442 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2443 ip6_del_rt(rt);
1da177e4
LT		 2444 goto restart;
2445 }
2446 }
c71099ac 2447 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2448}
2449
5578689a
DL		 2450static void rtmsg_to_fib6_config(struct net *net,
2451 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2452 struct fib6_config *cfg)
2453{
2454 memset(cfg, 0, sizeof(*cfg));
2455
ca254490
DA		 2456 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2457 : RT6_TABLE_MAIN;
86872cb5
TG		 2458 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2459 cfg->fc_metric = rtmsg->rtmsg_metric;
2460 cfg->fc_expires = rtmsg->rtmsg_info;
2461 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2462 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2463 cfg->fc_flags = rtmsg->rtmsg_flags;
2464
5578689a 2465 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2466
4e3fd7a0
AD		 2467 cfg->fc_dst = rtmsg->rtmsg_dst;
2468 cfg->fc_src = rtmsg->rtmsg_src;
2469 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2470}
2471
5578689a 2472int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2473{
86872cb5 2474 struct fib6_config cfg;
1da177e4
LT		 2475 struct in6_rtmsg rtmsg;
2476 int err;
2477
67ba4152 2478 switch (cmd) {
1da177e4
LT		 2479 case SIOCADDRT: /* Add a route */
2480 case SIOCDELRT: /* Delete a route */
af31f412 2481 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2482 return -EPERM;
2483 err = copy_from_user(&rtmsg, arg,
2484 sizeof(struct in6_rtmsg));
2485 if (err)
2486 return -EFAULT;
86872cb5 2487
5578689a 2488 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2489
1da177e4
LT		 2490 rtnl_lock();
2491 switch (cmd) {
2492 case SIOCADDRT:
86872cb5 2493 err = ip6_route_add(&cfg);
1da177e4
LT		 2494 break;
2495 case SIOCDELRT:
86872cb5 2496 err = ip6_route_del(&cfg);
1da177e4
LT		 2497 break;
2498 default:
2499 err = -EINVAL;
2500 }
2501 rtnl_unlock();
2502
2503 return err;
3ff50b79 2504 }
1da177e4
LT		 2505
2506 return -EINVAL;
2507}
2508
2509/*
2510 * Drop the packet on the floor
2511 */
2512
d5fdd6ba 2513static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2514{
612f09e8 2515 int type;
adf30907 2516 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2517 switch (ipstats_mib_noroutes) {
2518 case IPSTATS_MIB_INNOROUTES:
0660e03f 2519 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2520 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2521 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2522 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2523 break;
2524 }
2525 /* FALLTHROUGH */
2526 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2527 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2528 ipstats_mib_noroutes);
612f09e8
YH		 2529 break;
2530 }
3ffe533c 2531 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2532 kfree_skb(skb);
2533 return 0;
2534}
2535
9ce8ade0
TG		 2536static int ip6_pkt_discard(struct sk_buff *skb)
2537{
612f09e8 2538 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2539}
2540
ede2059d 2541static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2542{
adf30907 2543 skb->dev = skb_dst(skb)->dev;
612f09e8 2544 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2545}
2546
9ce8ade0
TG		 2547static int ip6_pkt_prohibit(struct sk_buff *skb)
2548{
612f09e8 2549 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2550}
2551
ede2059d 2552static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2553{
adf30907 2554 skb->dev = skb_dst(skb)->dev;
612f09e8 2555 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2556}
2557
1da177e4
LT		 2558/*
2559 * Allocate a dst for local (unicast / anycast) address.
2560 */
2561
2562struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2563 const struct in6_addr *addr,
8f031519 2564 bool anycast)
1da177e4 2565{
ca254490 2566 u32 tb_id;
c346dca1 2567 struct net *net = dev_net(idev->dev);
a3300ef4 2568 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2569 DST_NOCOUNT);
a3300ef4 2570 if (!rt)
1da177e4
LT		 2571 return ERR_PTR(-ENOMEM);
2572
1da177e4
LT		 2573 in6_dev_hold(idev);
2574
11d53b49 2575 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2576 rt->dst.input = ip6_input;
2577 rt->dst.output = ip6_output;
1da177e4 2578 rt->rt6i_idev = idev;
1da177e4
LT		 2579
2580 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2581 if (anycast)
2582 rt->rt6i_flags |= RTF_ANYCAST;
2583 else
1da177e4 2584 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2585
550bab42 2586 rt->rt6i_gateway = *addr;
4e3fd7a0 2587 rt->rt6i_dst.addr = *addr;
1da177e4 2588 rt->rt6i_dst.plen = 128;
ca254490
DA		 2589 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2590 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2591 rt->dst.flags |= DST_NOCACHE;
1da177e4 2592
d8d1f30b 2593 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2594
2595 return rt;
2596}
2597
c3968a85
DW		 2598/* remove deleted ip from prefsrc entries */
2599struct arg_dev_net_ip {
2600 struct net_device *dev;
2601 struct net *net;
2602 struct in6_addr *addr;
2603};
2604
2605static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2606{
2607 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2608 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2609 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2610
d1918542 2611 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2612 rt != net->ipv6.ip6_null_entry &&
2613 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2614 /* remove prefsrc entry */
2615 rt->rt6i_prefsrc.plen = 0;
2616 }
2617 return 0;
2618}
2619
2620void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2621{
2622 struct net *net = dev_net(ifp->idev->dev);
2623 struct arg_dev_net_ip adni = {
2624 .dev = ifp->idev->dev,
2625 .net = net,
2626 .addr = &ifp->addr,
2627 };
0c3584d5 2628 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2629}
2630
be7a010d
DJ		 2631#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2632#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2633
2634/* Remove routers and update dst entries when gateway turn into host. */
2635static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2636{
2637 struct in6_addr *gateway = (struct in6_addr *)arg;
2638
2639 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2640 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2641 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2642 return -1;
2643 }
2644 return 0;
2645}
2646
2647void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2648{
2649 fib6_clean_all(net, fib6_clean_tohost, gateway);
2650}
2651
8ed67789
DL		 2652struct arg_dev_net {
2653 struct net_device *dev;
2654 struct net *net;
2655};
2656
1da177e4
LT		 2657static int fib6_ifdown(struct rt6_info *rt, void *arg)
2658{
bc3ef660 2659 const struct arg_dev_net *adn = arg;
2660 const struct net_device *dev = adn->dev;
8ed67789 2661
d1918542 2662 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2663 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2664 return -1;
c159d30c 2665
1da177e4
LT		 2666 return 0;
2667}
2668
f3db4851 2669void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2670{
8ed67789
DL		 2671 struct arg_dev_net adn = {
2672 .dev = dev,
2673 .net = net,
2674 };
2675
0c3584d5 2676 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2677 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2678 if (dev)
2679 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2680}
2681
95c96174 2682struct rt6_mtu_change_arg {
1da177e4 2683 struct net_device *dev;
95c96174 2684 unsigned int mtu;
1da177e4
LT		 2685};
2686
2687static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2688{
2689 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2690 struct inet6_dev *idev;
2691
2692 /* In IPv6 pmtu discovery is not optional,
2693 so that RTAX_MTU lock cannot disable it.
2694 We still use this lock to block changes
2695 caused by addrconf/ndisc.
2696 */
2697
2698 idev = __in6_dev_get(arg->dev);
38308473 2699 if (!idev)
1da177e4
LT		 2700 return 0;
2701
2702 /* For administrative MTU increase, there is no way to discover
2703 IPv6 PMTU increase, so PMTU increase should be updated here.
2704 Since RFC 1981 doesn't include administrative MTU increase
2705 update PMTU increase is a MUST. (i.e. jumbo frame)
2706 */
2707 /*
2708 If new MTU is less than route PMTU, this new MTU will be the
2709 lowest MTU in the path, update the route PMTU to reflect PMTU
2710 decreases; if new MTU is greater than route PMTU, and the
2711 old MTU is the lowest MTU in the path, update the route PMTU
2712 to reflect the increase. In this case if the other nodes' MTU
2713 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2714 PMTU discouvery.
2715 */
d1918542 2716 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2717 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2718 if (rt->rt6i_flags & RTF_CACHE) {
2719 /* For RTF_CACHE with rt6i_pmtu == 0
2720 * (i.e. a redirected route),
2721 * the metrics of its rt->dst.from has already
2722 * been updated.
2723 */
2724 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2725 rt->rt6i_pmtu = arg->mtu;
2726 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2727 (dst_mtu(&rt->dst) < arg->mtu &&
2728 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2729 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2730 }
566cfd8f 2731 }
1da177e4
LT		 2732 return 0;
2733}
2734
95c96174 2735void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2736{
c71099ac
TG		 2737 struct rt6_mtu_change_arg arg = {
2738 .dev = dev,
2739 .mtu = mtu,
2740 };
1da177e4 2741
0c3584d5 2742 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2743}
2744
ef7c79ed 2745static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2746 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2747 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2748 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2749 [RTA_PRIORITY] = { .type = NLA_U32 },
2750 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2751 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2752 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2753 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2754 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2755 [RTA_EXPIRES] = { .type = NLA_U32 },
86872cb5
TG		 2756};
2757
2758static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2759 struct fib6_config *cfg)
1da177e4 2760{
86872cb5
TG		 2761 struct rtmsg *rtm;
2762 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2763 unsigned int pref;
86872cb5 2764 int err;
1da177e4 2765
86872cb5
TG		 2766 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2767 if (err < 0)
2768 goto errout;
1da177e4 2769
86872cb5
TG		 2770 err = -EINVAL;
2771 rtm = nlmsg_data(nlh);
2772 memset(cfg, 0, sizeof(*cfg));
2773
2774 cfg->fc_table = rtm->rtm_table;
2775 cfg->fc_dst_len = rtm->rtm_dst_len;
2776 cfg->fc_src_len = rtm->rtm_src_len;
2777 cfg->fc_flags = RTF_UP;
2778 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2779 cfg->fc_type = rtm->rtm_type;
86872cb5 2780
ef2c7d7b
ND		 2781 if (rtm->rtm_type == RTN_UNREACHABLE ||
2782 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2783 rtm->rtm_type == RTN_PROHIBIT ||
2784 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2785 cfg->fc_flags |= RTF_REJECT;
2786
ab79ad14
MŻ		 2787 if (rtm->rtm_type == RTN_LOCAL)
2788 cfg->fc_flags |= RTF_LOCAL;
2789
1f56a01f
MKL		 2790 if (rtm->rtm_flags & RTM_F_CLONED)
2791 cfg->fc_flags |= RTF_CACHE;
2792
15e47304 2793 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2794 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2795 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2796
2797 if (tb[RTA_GATEWAY]) {
67b61f6c 2798 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2799 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2800 }
86872cb5
TG		 2801
2802 if (tb[RTA_DST]) {
2803 int plen = (rtm->rtm_dst_len + 7) >> 3;
2804
2805 if (nla_len(tb[RTA_DST]) < plen)
2806 goto errout;
2807
2808 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2809 }
86872cb5
TG		 2810
2811 if (tb[RTA_SRC]) {
2812 int plen = (rtm->rtm_src_len + 7) >> 3;
2813
2814 if (nla_len(tb[RTA_SRC]) < plen)
2815 goto errout;
2816
2817 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2818 }
86872cb5 2819
c3968a85 2820 if (tb[RTA_PREFSRC])
67b61f6c 2821 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2822
86872cb5
TG		 2823 if (tb[RTA_OIF])
2824 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2825
2826 if (tb[RTA_PRIORITY])
2827 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2828
2829 if (tb[RTA_METRICS]) {
2830 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2831 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2832 }
86872cb5
TG		 2833
2834 if (tb[RTA_TABLE])
2835 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2836
51ebd318
ND		 2837 if (tb[RTA_MULTIPATH]) {
2838 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2839 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2840 }
2841
c78ba6d6
LR		 2842 if (tb[RTA_PREF]) {
2843 pref = nla_get_u8(tb[RTA_PREF]);
2844 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2845 pref != ICMPV6_ROUTER_PREF_HIGH)
2846 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2847 cfg->fc_flags |= RTF_PREF(pref);
2848 }
2849
19e42e45
RP		 2850 if (tb[RTA_ENCAP])
2851 cfg->fc_encap = tb[RTA_ENCAP];
2852
2853 if (tb[RTA_ENCAP_TYPE])
2854 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2855
32bc201e
XL		 2856 if (tb[RTA_EXPIRES]) {
2857 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2858
2859 if (addrconf_finite_timeout(timeout)) {
2860 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2861 cfg->fc_flags |= RTF_EXPIRES;
2862 }
2863 }
2864
86872cb5
TG		 2865 err = 0;
2866errout:
2867 return err;
1da177e4
LT		 2868}
2869
6b9ea5a6
RP		 2870struct rt6_nh {
2871 struct rt6_info *rt6_info;
2872 struct fib6_config r_cfg;
2873 struct mx6_config mxc;
2874 struct list_head next;
2875};
2876
2877static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2878{
2879 struct rt6_nh *nh;
2880
2881 list_for_each_entry(nh, rt6_nh_list, next) {
2882 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2883 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2884 nh->r_cfg.fc_ifindex);
2885 }
2886}
2887
2888static int ip6_route_info_append(struct list_head *rt6_nh_list,
2889 struct rt6_info *rt, struct fib6_config *r_cfg)
2890{
2891 struct rt6_nh *nh;
2892 struct rt6_info *rtnh;
2893 int err = -EEXIST;
2894
2895 list_for_each_entry(nh, rt6_nh_list, next) {
2896 /* check if rt6_info already exists */
2897 rtnh = nh->rt6_info;
2898
2899 if (rtnh->dst.dev == rt->dst.dev &&
2900 rtnh->rt6i_idev == rt->rt6i_idev &&
2901 ipv6_addr_equal(&rtnh->rt6i_gateway,
2902 &rt->rt6i_gateway))
2903 return err;
2904 }
2905
2906 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2907 if (!nh)
2908 return -ENOMEM;
2909 nh->rt6_info = rt;
2910 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2911 if (err) {
2912 kfree(nh);
2913 return err;
2914 }
2915 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2916 list_add_tail(&nh->next, rt6_nh_list);
2917
2918 return 0;
2919}
2920
2921static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2922{
2923 struct fib6_config r_cfg;
2924 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2925 struct rt6_info *rt;
2926 struct rt6_nh *err_nh;
2927 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2928 int remaining;
2929 int attrlen;
6b9ea5a6
RP		 2930 int err = 1;
2931 int nhn = 0;
2932 int replace = (cfg->fc_nlinfo.nlh &&
2933 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2934 LIST_HEAD(rt6_nh_list);
51ebd318 2935
35f1b4e9 2936 remaining = cfg->fc_mp_len;
51ebd318 2937 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2938
6b9ea5a6
RP		 2939 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2940 * rt6_info structs per nexthop
2941 */
51ebd318
ND		 2942 while (rtnh_ok(rtnh, remaining)) {
2943 memcpy(&r_cfg, cfg, sizeof(*cfg));
2944 if (rtnh->rtnh_ifindex)
2945 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2946
2947 attrlen = rtnh_attrlen(rtnh);
2948 if (attrlen > 0) {
2949 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2950
2951 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2952 if (nla) {
67b61f6c 2953 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2954 r_cfg.fc_flags |= RTF_GATEWAY;
2955 }
19e42e45
RP		 2956 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2957 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2958 if (nla)
2959 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2960 }
6b9ea5a6 2961
8c5b83f0
RP		 2962 rt = ip6_route_info_create(&r_cfg);
2963 if (IS_ERR(rt)) {
2964 err = PTR_ERR(rt);
2965 rt = NULL;
6b9ea5a6 2966 goto cleanup;
8c5b83f0 2967 }
6b9ea5a6
RP		 2968
2969 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2970 if (err) {
6b9ea5a6
RP		 2971 dst_free(&rt->dst);
2972 goto cleanup;
2973 }
2974
2975 rtnh = rtnh_next(rtnh, &remaining);
2976 }
2977
2978 err_nh = NULL;
2979 list_for_each_entry(nh, &rt6_nh_list, next) {
2980 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2981 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2982 nh->rt6_info = NULL;
2983 if (err) {
2984 if (replace && nhn)
2985 ip6_print_replace_route_err(&rt6_nh_list);
2986 err_nh = nh;
2987 goto add_errout;
51ebd318 2988 }
6b9ea5a6 2989
1a72418b 2990 /* Because each route is added like a single route we remove
27596472
MK		 2991 * these flags after the first nexthop: if there is a collision,
2992 * we have already failed to add the first nexthop:
2993 * fib6_add_rt2node() has rejected it; when replacing, old
2994 * nexthops have been replaced by first new, the rest should
2995 * be added to it.
1a72418b 2996 */
27596472
MK		 2997 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2998 NLM_F_REPLACE);
6b9ea5a6
RP		 2999 nhn++;
3000 }
3001
3002 goto cleanup;
3003
3004add_errout:
3005 /* Delete routes that were already added */
3006 list_for_each_entry(nh, &rt6_nh_list, next) {
3007 if (err_nh == nh)
3008 break;
3009 ip6_route_del(&nh->r_cfg);
3010 }
3011
3012cleanup:
3013 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3014 if (nh->rt6_info)
3015 dst_free(&nh->rt6_info->dst);
52fe51f8 3016 kfree(nh->mxc.mx);
6b9ea5a6
RP		 3017 list_del(&nh->next);
3018 kfree(nh);
3019 }
3020
3021 return err;
3022}
3023
3024static int ip6_route_multipath_del(struct fib6_config *cfg)
3025{
3026 struct fib6_config r_cfg;
3027 struct rtnexthop *rtnh;
3028 int remaining;
3029 int attrlen;
3030 int err = 1, last_err = 0;
3031
3032 remaining = cfg->fc_mp_len;
3033 rtnh = (struct rtnexthop *)cfg->fc_mp;
3034
3035 /* Parse a Multipath Entry */
3036 while (rtnh_ok(rtnh, remaining)) {
3037 memcpy(&r_cfg, cfg, sizeof(*cfg));
3038 if (rtnh->rtnh_ifindex)
3039 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3040
3041 attrlen = rtnh_attrlen(rtnh);
3042 if (attrlen > 0) {
3043 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3044
3045 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3046 if (nla) {
3047 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3048 r_cfg.fc_flags |= RTF_GATEWAY;
3049 }
3050 }
3051 err = ip6_route_del(&r_cfg);
3052 if (err)
3053 last_err = err;
3054
51ebd318
ND		 3055 rtnh = rtnh_next(rtnh, &remaining);
3056 }
3057
3058 return last_err;
3059}
3060
67ba4152 3061static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3062{
86872cb5
TG		 3063 struct fib6_config cfg;
3064 int err;
1da177e4 3065
86872cb5
TG		 3066 err = rtm_to_fib6_config(skb, nlh, &cfg);
3067 if (err < 0)
3068 return err;
3069
51ebd318 3070 if (cfg.fc_mp)
6b9ea5a6 3071 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3072 else
3073 return ip6_route_del(&cfg);
1da177e4
LT		 3074}
3075
67ba4152 3076static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3077{
86872cb5
TG		 3078 struct fib6_config cfg;
3079 int err;
1da177e4 3080
86872cb5
TG		 3081 err = rtm_to_fib6_config(skb, nlh, &cfg);
3082 if (err < 0)
3083 return err;
3084
51ebd318 3085 if (cfg.fc_mp)
6b9ea5a6 3086 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3087 else
3088 return ip6_route_add(&cfg);
1da177e4
LT		 3089}
3090
19e42e45 3091static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3092{
3093 return NLMSG_ALIGN(sizeof(struct rtmsg))
3094 + nla_total_size(16) /* RTA_SRC */
3095 + nla_total_size(16) /* RTA_DST */
3096 + nla_total_size(16) /* RTA_GATEWAY */
3097 + nla_total_size(16) /* RTA_PREFSRC */
3098 + nla_total_size(4) /* RTA_TABLE */
3099 + nla_total_size(4) /* RTA_IIF */
3100 + nla_total_size(4) /* RTA_OIF */
3101 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3102 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3103 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3104 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3105 + nla_total_size(1) /* RTA_PREF */
61adedf3 3106 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3107}
3108
191cd582
BH		 3109static int rt6_fill_node(struct net *net,
3110 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3111 struct in6_addr *dst, struct in6_addr *src,
15e47304 3112 int iif, int type, u32 portid, u32 seq,
7bc570c8 3113 int prefix, int nowait, unsigned int flags)
1da177e4 3114{
4b32b5ad 3115 u32 metrics[RTAX_MAX];
1da177e4 3116 struct rtmsg *rtm;
2d7202bf 3117 struct nlmsghdr *nlh;
e3703b3d 3118 long expires;
9e762a4a 3119 u32 table;
1da177e4
LT		 3120
3121 if (prefix) { /* user wants prefix routes only */
3122 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3123 /* success since this is not a prefix route */
3124 return 1;
3125 }
3126 }
3127
15e47304 3128 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3129 if (!nlh)
26932566 3130 return -EMSGSIZE;
2d7202bf
TG		 3131
3132 rtm = nlmsg_data(nlh);
1da177e4
LT		 3133 rtm->rtm_family = AF_INET6;
3134 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3135 rtm->rtm_src_len = rt->rt6i_src.plen;
3136 rtm->rtm_tos = 0;
c71099ac 3137 if (rt->rt6i_table)
9e762a4a 3138 table = rt->rt6i_table->tb6_id;
c71099ac 3139 else
9e762a4a
PM		 3140 table = RT6_TABLE_UNSPEC;
3141 rtm->rtm_table = table;
c78679e8
DM		 3142 if (nla_put_u32(skb, RTA_TABLE, table))
3143 goto nla_put_failure;
ef2c7d7b
ND		 3144 if (rt->rt6i_flags & RTF_REJECT) {
3145 switch (rt->dst.error) {
3146 case -EINVAL:
3147 rtm->rtm_type = RTN_BLACKHOLE;
3148 break;
3149 case -EACCES:
3150 rtm->rtm_type = RTN_PROHIBIT;
3151 break;
b4949ab2
ND		 3152 case -EAGAIN:
3153 rtm->rtm_type = RTN_THROW;
3154 break;
ef2c7d7b
ND		 3155 default:
3156 rtm->rtm_type = RTN_UNREACHABLE;
3157 break;
3158 }
3159 }
38308473 3160 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3161 rtm->rtm_type = RTN_LOCAL;
d1918542 3162 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3163 rtm->rtm_type = RTN_LOCAL;
3164 else
3165 rtm->rtm_type = RTN_UNICAST;
3166 rtm->rtm_flags = 0;
35103d11 3167 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3168 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3169 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3170 rtm->rtm_flags |= RTNH_F_DEAD;
3171 }
1da177e4
LT		 3172 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3173 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3174 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3175 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3176 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3177 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3178 rtm->rtm_protocol = RTPROT_RA;
3179 else
3180 rtm->rtm_protocol = RTPROT_KERNEL;
3181 }
1da177e4 3182
38308473 3183 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3184 rtm->rtm_flags |= RTM_F_CLONED;
3185
3186 if (dst) {
930345ea 3187 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3188 goto nla_put_failure;
1ab1457c 3189 rtm->rtm_dst_len = 128;
1da177e4 3190 } else if (rtm->rtm_dst_len)
930345ea 3191 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3192 goto nla_put_failure;
1da177e4
LT		 3193#ifdef CONFIG_IPV6_SUBTREES
3194 if (src) {
930345ea 3195 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3196 goto nla_put_failure;
1ab1457c 3197 rtm->rtm_src_len = 128;
c78679e8 3198 } else if (rtm->rtm_src_len &&
930345ea 3199 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3200 goto nla_put_failure;
1da177e4 3201#endif
7bc570c8
YH		 3202 if (iif) {
3203#ifdef CONFIG_IPV6_MROUTE
3204 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2cf75070
NA		 3205 int err = ip6mr_get_route(net, skb, rtm, nowait,
3206 portid);
3207
7bc570c8
YH		 3208 if (err <= 0) {
3209 if (!nowait) {
3210 if (err == 0)
3211 return 0;
3212 goto nla_put_failure;
3213 } else {
3214 if (err == -EMSGSIZE)
3215 goto nla_put_failure;
3216 }
3217 }
3218 } else
3219#endif
c78679e8
DM		 3220 if (nla_put_u32(skb, RTA_IIF, iif))
3221 goto nla_put_failure;
7bc570c8 3222 } else if (dst) {
1da177e4 3223 struct in6_addr saddr_buf;
c78679e8 3224 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3225 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3226 goto nla_put_failure;
1da177e4 3227 }
2d7202bf 3228
c3968a85
DW		 3229 if (rt->rt6i_prefsrc.plen) {
3230 struct in6_addr saddr_buf;
4e3fd7a0 3231 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3232 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3233 goto nla_put_failure;
c3968a85
DW		 3234 }
3235
4b32b5ad
MKL		 3236 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3237 if (rt->rt6i_pmtu)
3238 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3239 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3240 goto nla_put_failure;
3241
dd0cbf29 3242 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3243 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3244 goto nla_put_failure;
94f826b8 3245 }
2d7202bf 3246
c78679e8
DM		 3247 if (rt->dst.dev &&
3248 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3249 goto nla_put_failure;
3250 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3251 goto nla_put_failure;
8253947e
LW		 3252
3253 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3254
87a50699 3255 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3256 goto nla_put_failure;
2d7202bf 3257
c78ba6d6
LR		 3258 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3259 goto nla_put_failure;
3260
61adedf3 3261 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3262
053c095a
JB		 3263 nlmsg_end(skb, nlh);
3264 return 0;
2d7202bf
TG		 3265
3266nla_put_failure:
26932566
PM		 3267 nlmsg_cancel(skb, nlh);
3268 return -EMSGSIZE;
1da177e4
LT		 3269}
3270
1b43af54 3271int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3272{
3273 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3274 int prefix;
3275
2d7202bf
TG		 3276 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3277 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3278 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3279 } else
3280 prefix = 0;
3281
191cd582
BH		 3282 return rt6_fill_node(arg->net,
3283 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3284 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3285 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3286}
3287
67ba4152 3288static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3289{
3b1e0a65 3290 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3291 struct nlattr *tb[RTA_MAX+1];
3292 struct rt6_info *rt;
1da177e4 3293 struct sk_buff *skb;
ab364a6f 3294 struct rtmsg *rtm;
4c9483b2 3295 struct flowi6 fl6;
72331bc0 3296 int err, iif = 0, oif = 0;
1da177e4 3297
ab364a6f
TG		 3298 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3299 if (err < 0)
3300 goto errout;
1da177e4 3301
ab364a6f 3302 err = -EINVAL;
4c9483b2 3303 memset(&fl6, 0, sizeof(fl6));
38b7097b
HFS		 3304 rtm = nlmsg_data(nlh);
3305 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
1da177e4 3306
ab364a6f
TG		 3307 if (tb[RTA_SRC]) {
3308 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3309 goto errout;
3310
4e3fd7a0 3311 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3312 }
3313
3314 if (tb[RTA_DST]) {
3315 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3316 goto errout;
3317
4e3fd7a0 3318 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3319 }
3320
3321 if (tb[RTA_IIF])
3322 iif = nla_get_u32(tb[RTA_IIF]);
3323
3324 if (tb[RTA_OIF])
72331bc0 3325 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3326
2e47b291
LC		 3327 if (tb[RTA_MARK])
3328 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3329
1da177e4
LT		 3330 if (iif) {
3331 struct net_device *dev;
72331bc0
SL		 3332 int flags = 0;
3333
5578689a 3334 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3335 if (!dev) {
3336 err = -ENODEV;
ab364a6f 3337 goto errout;
1da177e4 3338 }
72331bc0
SL		 3339
3340 fl6.flowi6_iif = iif;
3341
3342 if (!ipv6_addr_any(&fl6.saddr))
3343 flags |= RT6_LOOKUP_F_HAS_SADDR;
3344
3345 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3346 flags);
3347 } else {
3348 fl6.flowi6_oif = oif;
3349
ca254490
DA		 3350 if (netif_index_is_l3_master(net, oif)) {
3351 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3352 FLOWI_FLAG_SKIP_NH_OIF;
3353 }
3354
72331bc0 3355 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3356 }
3357
ab364a6f 3358 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3359 if (!skb) {
94e187c0 3360 ip6_rt_put(rt);
ab364a6f
TG		 3361 err = -ENOBUFS;
3362 goto errout;
3363 }
1da177e4 3364
ab364a6f
TG		 3365 /* Reserve room for dummy headers, this skb can pass
3366 through good chunk of routing engine.
3367 */
459a98ed 3368 skb_reset_mac_header(skb);
ab364a6f 3369 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3370
d8d1f30b 3371 skb_dst_set(skb, &rt->dst);
1da177e4 3372
4c9483b2 3373 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3374 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3375 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3376 if (err < 0) {
ab364a6f
TG		 3377 kfree_skb(skb);
3378 goto errout;
1da177e4
LT		 3379 }
3380
15e47304 3381 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3382errout:
1da177e4 3383 return err;
1da177e4
LT		 3384}
3385
37a1d361
RP		 3386void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3387 unsigned int nlm_flags)
1da177e4
LT		 3388{
3389 struct sk_buff *skb;
5578689a 3390 struct net *net = info->nl_net;
528c4ceb
DL		 3391 u32 seq;
3392 int err;
3393
3394 err = -ENOBUFS;
38308473 3395 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3396
19e42e45 3397 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3398 if (!skb)
21713ebc
TG		 3399 goto errout;
3400
191cd582 3401 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3402 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3403 if (err < 0) {
3404 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3405 WARN_ON(err == -EMSGSIZE);
3406 kfree_skb(skb);
3407 goto errout;
3408 }
15e47304 3409 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3410 info->nlh, gfp_any());
3411 return;
21713ebc
TG		 3412errout:
3413 if (err < 0)
5578689a 3414 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3415}
3416
8ed67789 3417static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3418 unsigned long event, void *ptr)
8ed67789 3419{
351638e7 3420 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3421 struct net *net = dev_net(dev);
8ed67789
DL		 3422
3423 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3424 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3425 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3426#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3427 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3428 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3429 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3430 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3431#endif
3432 }
3433
3434 return NOTIFY_OK;
3435}
3436
1da177e4
LT		 3437/*
3438 * /proc
3439 */
3440
3441#ifdef CONFIG_PROC_FS
3442
33120b30
AD		 3443static const struct file_operations ipv6_route_proc_fops = {
3444 .owner = THIS_MODULE,
3445 .open = ipv6_route_open,
3446 .read = seq_read,
3447 .llseek = seq_lseek,
8d2ca1d7 3448 .release = seq_release_net,
33120b30
AD		 3449};
3450
1da177e4
LT		 3451static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3452{
69ddb805 3453 struct net *net = (struct net *)seq->private;
1da177e4 3454 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3455 net->ipv6.rt6_stats->fib_nodes,
3456 net->ipv6.rt6_stats->fib_route_nodes,
3457 net->ipv6.rt6_stats->fib_rt_alloc,
3458 net->ipv6.rt6_stats->fib_rt_entries,
3459 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3460 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3461 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3462
3463 return 0;
3464}
3465
3466static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3467{
de05c557 3468 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3469}
3470
9a32144e 3471static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3472 .owner = THIS_MODULE,
3473 .open = rt6_stats_seq_open,
3474 .read = seq_read,
3475 .llseek = seq_lseek,
b6fcbdb4 3476 .release = single_release_net,
1da177e4
LT		 3477};
3478#endif /* CONFIG_PROC_FS */
3479
3480#ifdef CONFIG_SYSCTL
3481
1da177e4 3482static
fe2c6338 3483int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3484 void __user *buffer, size_t *lenp, loff_t *ppos)
3485{
c486da34
LAG		 3486 struct net *net;
3487 int delay;
3488 if (!write)
1da177e4 3489 return -EINVAL;
c486da34
LAG		 3490
3491 net = (struct net *)ctl->extra1;
3492 delay = net->ipv6.sysctl.flush_delay;
3493 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3494 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3495 return 0;
1da177e4
LT		 3496}
3497
fe2c6338 3498struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3499 {
1da177e4 3500 .procname = "flush",
4990509f 3501 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3502 .maxlen = sizeof(int),
89c8b3a1 3503 .mode = 0200,
6d9f239a 3504 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3505 },
3506 {
1da177e4 3507 .procname = "gc_thresh",
9a7ec3a9 3508 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3509 .maxlen = sizeof(int),
3510 .mode = 0644,
6d9f239a 3511 .proc_handler = proc_dointvec,
1da177e4
LT		 3512 },
3513 {
1da177e4 3514 .procname = "max_size",
4990509f 3515 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3516 .maxlen = sizeof(int),
3517 .mode = 0644,
6d9f239a 3518 .proc_handler = proc_dointvec,
1da177e4
LT		 3519 },
3520 {
1da177e4 3521 .procname = "gc_min_interval",
4990509f 3522 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3523 .maxlen = sizeof(int),
3524 .mode = 0644,
6d9f239a 3525 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3526 },
3527 {
1da177e4 3528 .procname = "gc_timeout",
4990509f 3529 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3530 .maxlen = sizeof(int),
3531 .mode = 0644,
6d9f239a 3532 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3533 },
3534 {
1da177e4 3535 .procname = "gc_interval",
4990509f 3536 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3537 .maxlen = sizeof(int),
3538 .mode = 0644,
6d9f239a 3539 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3540 },
3541 {
1da177e4 3542 .procname = "gc_elasticity",
4990509f 3543 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3544 .maxlen = sizeof(int),
3545 .mode = 0644,
f3d3f616 3546 .proc_handler = proc_dointvec,
1da177e4
LT		 3547 },
3548 {
1da177e4 3549 .procname = "mtu_expires",
4990509f 3550 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3551 .maxlen = sizeof(int),
3552 .mode = 0644,
6d9f239a 3553 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3554 },
3555 {
1da177e4 3556 .procname = "min_adv_mss",
4990509f 3557 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3558 .maxlen = sizeof(int),
3559 .mode = 0644,
f3d3f616 3560 .proc_handler = proc_dointvec,
1da177e4
LT		 3561 },
3562 {
1da177e4 3563 .procname = "gc_min_interval_ms",
4990509f 3564 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3565 .maxlen = sizeof(int),
3566 .mode = 0644,
6d9f239a 3567 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3568 },
f8572d8f 3569 { }
1da177e4
LT		 3570};
3571
2c8c1e72 3572struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3573{
3574 struct ctl_table *table;
3575
3576 table = kmemdup(ipv6_route_table_template,
3577 sizeof(ipv6_route_table_template),
3578 GFP_KERNEL);
5ee09105
YH		 3579
3580 if (table) {
3581 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3582 table[0].extra1 = net;
86393e52 3583 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3584 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3585 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3586 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3587 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3588 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3589 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3590 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3591 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3592
3593 /* Don't export sysctls to unprivileged users */
3594 if (net->user_ns != &init_user_ns)
3595 table[0].procname = NULL;
5ee09105
YH		 3596 }
3597
760f2d01
DL		 3598 return table;
3599}
1da177e4
LT		 3600#endif
3601
2c8c1e72 3602static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3603{
633d424b 3604 int ret = -ENOMEM;
8ed67789 3605
86393e52
AD		 3606 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3607 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3608
fc66f95c
ED		 3609 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3610 goto out_ip6_dst_ops;
3611
8ed67789
DL		 3612 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3613 sizeof(*net->ipv6.ip6_null_entry),
3614 GFP_KERNEL);
3615 if (!net->ipv6.ip6_null_entry)
fc66f95c 3616 goto out_ip6_dst_entries;
d8d1f30b 3617 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3618 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3619 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3620 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3621 ip6_template_metrics, true);
8ed67789
DL		 3622
3623#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3624 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3625 sizeof(*net->ipv6.ip6_prohibit_entry),
3626 GFP_KERNEL);
68fffc67
PZ		 3627 if (!net->ipv6.ip6_prohibit_entry)
3628 goto out_ip6_null_entry;
d8d1f30b 3629 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3630 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3631 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3632 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3633 ip6_template_metrics, true);
8ed67789
DL		 3634
3635 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3636 sizeof(*net->ipv6.ip6_blk_hole_entry),
3637 GFP_KERNEL);
68fffc67
PZ		 3638 if (!net->ipv6.ip6_blk_hole_entry)
3639 goto out_ip6_prohibit_entry;
d8d1f30b 3640 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3641 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3642 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3643 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3644 ip6_template_metrics, true);
8ed67789
DL		 3645#endif
3646
b339a47c
PZ		 3647 net->ipv6.sysctl.flush_delay = 0;
3648 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3649 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3650 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3651 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3652 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3653 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3654 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3655
6891a346
BT		 3656 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3657
8ed67789
DL		 3658 ret = 0;
3659out:
3660 return ret;
f2fc6a54 3661
68fffc67
PZ		 3662#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3663out_ip6_prohibit_entry:
3664 kfree(net->ipv6.ip6_prohibit_entry);
3665out_ip6_null_entry:
3666 kfree(net->ipv6.ip6_null_entry);
3667#endif
fc66f95c
ED		 3668out_ip6_dst_entries:
3669 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3670out_ip6_dst_ops:
f2fc6a54 3671 goto out;
cdb18761
DL		 3672}
3673
2c8c1e72 3674static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3675{
8ed67789
DL		 3676 kfree(net->ipv6.ip6_null_entry);
3677#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3678 kfree(net->ipv6.ip6_prohibit_entry);
3679 kfree(net->ipv6.ip6_blk_hole_entry);
3680#endif
41bb78b4 3681 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3682}
3683
d189634e
TG		 3684static int __net_init ip6_route_net_init_late(struct net *net)
3685{
3686#ifdef CONFIG_PROC_FS
d4beaa66
G		 3687 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3688 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3689#endif
3690 return 0;
3691}
3692
3693static void __net_exit ip6_route_net_exit_late(struct net *net)
3694{
3695#ifdef CONFIG_PROC_FS
ece31ffd
G		 3696 remove_proc_entry("ipv6_route", net->proc_net);
3697 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3698#endif
3699}
3700
cdb18761
DL		 3701static struct pernet_operations ip6_route_net_ops = {
3702 .init = ip6_route_net_init,
3703 .exit = ip6_route_net_exit,
3704};
3705
c3426b47
DM		 3706static int __net_init ipv6_inetpeer_init(struct net *net)
3707{
3708 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3709
3710 if (!bp)
3711 return -ENOMEM;
3712 inet_peer_base_init(bp);
3713 net->ipv6.peers = bp;
3714 return 0;
3715}
3716
3717static void __net_exit ipv6_inetpeer_exit(struct net *net)
3718{
3719 struct inet_peer_base *bp = net->ipv6.peers;
3720
3721 net->ipv6.peers = NULL;
56a6b248 3722 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3723 kfree(bp);
3724}
3725
2b823f72 3726static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3727 .init = ipv6_inetpeer_init,
3728 .exit = ipv6_inetpeer_exit,
3729};
3730
d189634e
TG		 3731static struct pernet_operations ip6_route_net_late_ops = {
3732 .init = ip6_route_net_init_late,
3733 .exit = ip6_route_net_exit_late,
3734};
3735
8ed67789
DL		 3736static struct notifier_block ip6_route_dev_notifier = {
3737 .notifier_call = ip6_route_dev_notify,
3738 .priority = 0,
3739};
3740
433d49c3 3741int __init ip6_route_init(void)
1da177e4 3742{
433d49c3 3743 int ret;
8d0b94af 3744 int cpu;
433d49c3 3745
9a7ec3a9
DL		 3746 ret = -ENOMEM;
3747 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3748 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3749 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3750 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3751 goto out;
14e50e57 3752
fc66f95c 3753 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3754 if (ret)
bdb3289f 3755 goto out_kmem_cache;
bdb3289f 3756
c3426b47
DM		 3757 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3758 if (ret)
e8803b6c 3759 goto out_dst_entries;
2a0c451a 3760
7e52b33b
DM		 3761 ret = register_pernet_subsys(&ip6_route_net_ops);
3762 if (ret)
3763 goto out_register_inetpeer;
c3426b47 3764
5dc121e9
AE		 3765 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3766
8ed67789
DL		 3767 /* Registering of the loopback is done before this portion of code,
3768 * the loopback reference in rt6_info will not be taken, do it
3769 * manually for init_net */
d8d1f30b 3770 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3771 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3772 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3773 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3774 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3775 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3776 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3777 #endif
e8803b6c 3778 ret = fib6_init();
433d49c3 3779 if (ret)
8ed67789 3780 goto out_register_subsys;
433d49c3 3781
433d49c3
DL		 3782 ret = xfrm6_init();
3783 if (ret)
e8803b6c 3784 goto out_fib6_init;
c35b7e72 3785
433d49c3
DL		 3786 ret = fib6_rules_init();
3787 if (ret)
3788 goto xfrm6_init;
7e5449c2 3789
d189634e
TG		 3790 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3791 if (ret)
3792 goto fib6_rules_init;
3793
433d49c3 3794 ret = -ENOBUFS;
c7ac8679
GR		 3795 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3796 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3797 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3798 goto out_register_late_subsys;
c127ea2c 3799
8ed67789 3800 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3801 if (ret)
d189634e 3802 goto out_register_late_subsys;
8ed67789 3803
8d0b94af
MKL		 3804 for_each_possible_cpu(cpu) {
3805 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3806
3807 INIT_LIST_HEAD(&ul->head);
3808 spin_lock_init(&ul->lock);
3809 }
3810
433d49c3
DL		 3811out:
3812 return ret;
3813
d189634e
TG		 3814out_register_late_subsys:
3815 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3816fib6_rules_init:
433d49c3
DL		 3817 fib6_rules_cleanup();
3818xfrm6_init:
433d49c3 3819 xfrm6_fini();
2a0c451a
TG		 3820out_fib6_init:
3821 fib6_gc_cleanup();
8ed67789
DL		 3822out_register_subsys:
3823 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3824out_register_inetpeer:
3825 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3826out_dst_entries:
3827 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3828out_kmem_cache:
f2fc6a54 3829 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3830 goto out;
1da177e4
LT		 3831}
3832
3833void ip6_route_cleanup(void)
3834{
8ed67789 3835 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3836 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3837 fib6_rules_cleanup();
1da177e4 3838 xfrm6_fini();
1da177e4 3839 fib6_gc_cleanup();
c3426b47 3840 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3841 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3842 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3843 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3844}
Linux kernel - Deliverables
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