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Merge tag 'arm64-perf' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux-2.6-block.git] / net / ipv6 / route.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1da177e4
LT		 8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14/* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
c0bece9f
YH		 23 * Ville Nuorvala
24 * Fixed routing subtrees.
1da177e4
LT		 25 */
26
f3213831
JP		 27#define pr_fmt(fmt) "IPv6: " fmt
28
4fc268d2 29#include <linux/capability.h>
1da177e4 30#include <linux/errno.h>
bc3b2d7f 31#include <linux/export.h>
1da177e4
LT		 32#include <linux/types.h>
33#include <linux/times.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/net.h>
37#include <linux/route.h>
38#include <linux/netdevice.h>
39#include <linux/in6.h>
7bc570c8 40#include <linux/mroute6.h>
1da177e4 41#include <linux/init.h>
1da177e4 42#include <linux/if_arp.h>
1da177e4
LT		 43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
5b7c931d 45#include <linux/nsproxy.h>
5a0e3ad6 46#include <linux/slab.h>
457c4cbc 47#include <net/net_namespace.h>
1da177e4
LT		 48#include <net/snmp.h>
49#include <net/ipv6.h>
50#include <net/ip6_fib.h>
51#include <net/ip6_route.h>
52#include <net/ndisc.h>
53#include <net/addrconf.h>
54#include <net/tcp.h>
55#include <linux/rtnetlink.h>
56#include <net/dst.h>
904af04d 57#include <net/dst_metadata.h>
1da177e4 58#include <net/xfrm.h>
8d71740c 59#include <net/netevent.h>
21713ebc 60#include <net/netlink.h>
51ebd318 61#include <net/nexthop.h>
19e42e45 62#include <net/lwtunnel.h>
904af04d 63#include <net/ip_tunnels.h>
ca254490 64#include <net/l3mdev.h>
b811580d 65#include <trace/events/fib6.h>
1da177e4
LT		 66
67#include <asm/uaccess.h>
68
69#ifdef CONFIG_SYSCTL
70#include <linux/sysctl.h>
71#endif
72
afc154e9 73enum rt6_nud_state {
7e980569
JB		 74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 77 RT6_NUD_SUCCEED = 1
78};
79
83a09abd 80static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
1da177e4 81static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 82static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 83static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 84static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85static void ip6_dst_destroy(struct dst_entry *);
86static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
569d3645 88static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 89
90static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 91static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 92static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 93static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 94static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 95static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
4b32b5ad 99static void rt6_dst_from_metrics_check(struct rt6_info *rt);
52bd4c0c 100static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 101
70ceb4f5 102#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 103static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex,
95c96174 106 unsigned int pref);
efa2cea0 107static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 108 const struct in6_addr *prefix, int prefixlen,
109 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 110#endif
111
8d0b94af
MKL		 112struct uncached_list {
113 spinlock_t lock;
114 struct list_head head;
115};
116
117static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118
119static void rt6_uncached_list_add(struct rt6_info *rt)
120{
121 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122
123 rt->dst.flags |= DST_NOCACHE;
124 rt->rt6i_uncached_list = ul;
125
126 spin_lock_bh(&ul->lock);
127 list_add_tail(&rt->rt6i_uncached, &ul->head);
128 spin_unlock_bh(&ul->lock);
129}
130
131static void rt6_uncached_list_del(struct rt6_info *rt)
132{
133 if (!list_empty(&rt->rt6i_uncached)) {
134 struct uncached_list *ul = rt->rt6i_uncached_list;
135
136 spin_lock_bh(&ul->lock);
137 list_del(&rt->rt6i_uncached);
138 spin_unlock_bh(&ul->lock);
139 }
140}
141
142static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143{
144 struct net_device *loopback_dev = net->loopback_dev;
145 int cpu;
146
e332bc67
EB		 147 if (dev == loopback_dev)
148 return;
149
8d0b94af
MKL		 150 for_each_possible_cpu(cpu) {
151 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 struct rt6_info *rt;
153
154 spin_lock_bh(&ul->lock);
155 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
156 struct inet6_dev *rt_idev = rt->rt6i_idev;
157 struct net_device *rt_dev = rt->dst.dev;
158
e332bc67 159 if (rt_idev->dev == dev) {
8d0b94af
MKL		 160 rt->rt6i_idev = in6_dev_get(loopback_dev);
161 in6_dev_put(rt_idev);
162 }
163
e332bc67 164 if (rt_dev == dev) {
8d0b94af
MKL		 165 rt->dst.dev = loopback_dev;
166 dev_hold(rt->dst.dev);
167 dev_put(rt_dev);
168 }
169 }
170 spin_unlock_bh(&ul->lock);
171 }
172}
173
d52d3997
MKL		 174static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175{
176 return dst_metrics_write_ptr(rt->dst.from);
177}
178
06582540
DM		 179static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180{
4b32b5ad 181 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 182
d52d3997
MKL		 183 if (rt->rt6i_flags & RTF_PCPU)
184 return rt6_pcpu_cow_metrics(rt);
185 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 186 return NULL;
187 else
3b471175 188 return dst_cow_metrics_generic(dst, old);
06582540
DM		 189}
190
f894cbf8
DM		 191static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct sk_buff *skb,
193 const void *daddr)
39232973
DM		 194{
195 struct in6_addr *p = &rt->rt6i_gateway;
196
a7563f34 197 if (!ipv6_addr_any(p))
39232973 198 return (const void *) p;
f894cbf8
DM		 199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
39232973
DM		 201 return daddr;
202}
203
f894cbf8
DM		 204static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct sk_buff *skb,
206 const void *daddr)
d3aaeb38 207{
39232973
DM		 208 struct rt6_info *rt = (struct rt6_info *) dst;
209 struct neighbour *n;
210
f894cbf8 211 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 212 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 213 if (n)
214 return n;
215 return neigh_create(&nd_tbl, daddr, dst->dev);
216}
217
9a7ec3a9 218static struct dst_ops ip6_dst_ops_template = {
1da177e4 219 .family = AF_INET6,
1da177e4
LT		 220 .gc = ip6_dst_gc,
221 .gc_thresh = 1024,
222 .check = ip6_dst_check,
0dbaee3b 223 .default_advmss = ip6_default_advmss,
ebb762f2 224 .mtu = ip6_mtu,
06582540 225 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 226 .destroy = ip6_dst_destroy,
227 .ifdown = ip6_dst_ifdown,
228 .negative_advice = ip6_negative_advice,
229 .link_failure = ip6_link_failure,
230 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 231 .redirect = rt6_do_redirect,
9f8955cc 232 .local_out = __ip6_local_out,
d3aaeb38 233 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 234};
235
ebb762f2 236static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 237{
618f9bc7
SK		 238 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239
240 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 241}
242
6700c270
DM		 243static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 245{
246}
247
6700c270
DM		 248static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
249 struct sk_buff *skb)
b587ee3b
DM		 250{
251}
252
14e50e57
DM		 253static struct dst_ops ip6_dst_blackhole_ops = {
254 .family = AF_INET6,
14e50e57
DM		 255 .destroy = ip6_dst_destroy,
256 .check = ip6_dst_check,
ebb762f2 257 .mtu = ip6_blackhole_mtu,
214f45c9 258 .default_advmss = ip6_default_advmss,
14e50e57 259 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 260 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 261 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 262 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 263};
264
62fa8a84 265static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 266 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 267};
268
fb0af4c7 269static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 270 .dst = {
271 .__refcnt = ATOMIC_INIT(1),
272 .__use = 1,
2c20cbd7 273 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 274 .error = -ENETUNREACH,
d8d1f30b
CG		 275 .input = ip6_pkt_discard,
276 .output = ip6_pkt_discard_out,
1da177e4
LT		 277 },
278 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 279 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 280 .rt6i_metric = ~(u32) 0,
281 .rt6i_ref = ATOMIC_INIT(1),
282};
283
101367c2
TG		 284#ifdef CONFIG_IPV6_MULTIPLE_TABLES
285
fb0af4c7 286static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
2c20cbd7 290 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 291 .error = -EACCES,
d8d1f30b
CG		 292 .input = ip6_pkt_prohibit,
293 .output = ip6_pkt_prohibit_out,
101367c2
TG		 294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 296 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299};
300
fb0af4c7 301static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
2c20cbd7 305 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 306 .error = -EINVAL,
d8d1f30b 307 .input = dst_discard,
ede2059d 308 .output = dst_discard_out,
101367c2
TG		 309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 311 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 312 .rt6i_metric = ~(u32) 0,
313 .rt6i_ref = ATOMIC_INIT(1),
314};
315
316#endif
317
ebfa45f0
MKL		 318static void rt6_info_init(struct rt6_info *rt)
319{
320 struct dst_entry *dst = &rt->dst;
321
322 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
323 INIT_LIST_HEAD(&rt->rt6i_siblings);
324 INIT_LIST_HEAD(&rt->rt6i_uncached);
325}
326
1da177e4 327/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 328static struct rt6_info *__ip6_dst_alloc(struct net *net,
329 struct net_device *dev,
ad706862 330 int flags)
1da177e4 331{
97bab73f 332 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 333 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 334
ebfa45f0
MKL		 335 if (rt)
336 rt6_info_init(rt);
8104891b 337
cf911662 338 return rt;
1da177e4
LT		 339}
340
9ab179d8
DA		 341struct rt6_info *ip6_dst_alloc(struct net *net,
342 struct net_device *dev,
343 int flags)
d52d3997 344{
ad706862 345 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 346
347 if (rt) {
348 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
349 if (rt->rt6i_pcpu) {
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 struct rt6_info **p;
354
355 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
356 /* no one shares rt */
357 *p = NULL;
358 }
359 } else {
360 dst_destroy((struct dst_entry *)rt);
361 return NULL;
362 }
363 }
364
365 return rt;
366}
9ab179d8 367EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 368
1da177e4
LT		 369static void ip6_dst_destroy(struct dst_entry *dst)
370{
371 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 372 struct dst_entry *from = dst->from;
8d0b94af 373 struct inet6_dev *idev;
1da177e4 374
4b32b5ad 375 dst_destroy_metrics_generic(dst);
87775312 376 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 377 rt6_uncached_list_del(rt);
378
379 idev = rt->rt6i_idev;
38308473 380 if (idev) {
1da177e4
LT		 381 rt->rt6i_idev = NULL;
382 in6_dev_put(idev);
1ab1457c 383 }
1716a961 384
ecd98837
YH		 385 dst->from = NULL;
386 dst_release(from);
b3419363
DM		 387}
388
1da177e4
LT		 389static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
390 int how)
391{
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 394 struct net_device *loopback_dev =
c346dca1 395 dev_net(dev)->loopback_dev;
1da177e4 396
97cac082
DM		 397 if (dev != loopback_dev) {
398 if (idev && idev->dev == dev) {
399 struct inet6_dev *loopback_idev =
400 in6_dev_get(loopback_dev);
401 if (loopback_idev) {
402 rt->rt6i_idev = loopback_idev;
403 in6_dev_put(idev);
404 }
405 }
1da177e4
LT		 406 }
407}
408
5973fb1e
MKL		 409static bool __rt6_check_expired(const struct rt6_info *rt)
410{
411 if (rt->rt6i_flags & RTF_EXPIRES)
412 return time_after(jiffies, rt->dst.expires);
413 else
414 return false;
415}
416
a50feda5 417static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 418{
1716a961
G		 419 if (rt->rt6i_flags & RTF_EXPIRES) {
420 if (time_after(jiffies, rt->dst.expires))
a50feda5 421 return true;
1716a961 422 } else if (rt->dst.from) {
3fd91fb3 423 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 424 }
a50feda5 425 return false;
1da177e4
LT		 426}
427
51ebd318
ND		 428/* Multipath route selection:
429 * Hash based function using packet header and flowlabel.
430 * Adapted from fib_info_hashfn()
431 */
432static int rt6_info_hash_nhsfn(unsigned int candidate_count,
433 const struct flowi6 *fl6)
434{
644d0e65 435 return get_hash_from_flowi6(fl6) % candidate_count;
51ebd318
ND		 436}
437
438static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 439 struct flowi6 *fl6, int oif,
440 int strict)
51ebd318
ND		 441{
442 struct rt6_info *sibling, *next_sibling;
443 int route_choosen;
444
445 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
446 /* Don't change the route, if route_choosen == 0
447 * (siblings does not include ourself)
448 */
449 if (route_choosen)
450 list_for_each_entry_safe(sibling, next_sibling,
451 &match->rt6i_siblings, rt6i_siblings) {
452 route_choosen--;
453 if (route_choosen == 0) {
52bd4c0c
ND		 454 if (rt6_score_route(sibling, oif, strict) < 0)
455 break;
51ebd318
ND		 456 match = sibling;
457 break;
458 }
459 }
460 return match;
461}
462
1da177e4 463/*
c71099ac 464 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 465 */
466
8ed67789
DL		 467static inline struct rt6_info *rt6_device_match(struct net *net,
468 struct rt6_info *rt,
b71d1d42 469 const struct in6_addr *saddr,
1da177e4 470 int oif,
d420895e 471 int flags)
1da177e4
LT		 472{
473 struct rt6_info *local = NULL;
474 struct rt6_info *sprt;
475
dd3abc4e
YH		 476 if (!oif && ipv6_addr_any(saddr))
477 goto out;
478
d8d1f30b 479 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 480 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 481
482 if (oif) {
1da177e4
LT		 483 if (dev->ifindex == oif)
484 return sprt;
485 if (dev->flags & IFF_LOOPBACK) {
38308473 486 if (!sprt->rt6i_idev ||
1da177e4 487 sprt->rt6i_idev->dev->ifindex != oif) {
17fb0b2b 488 if (flags & RT6_LOOKUP_F_IFACE)
1da177e4 489 continue;
17fb0b2b
DA		 490 if (local &&
491 local->rt6i_idev->dev->ifindex == oif)
1da177e4
LT		 492 continue;
493 }
494 local = sprt;
495 }
dd3abc4e
YH		 496 } else {
497 if (ipv6_chk_addr(net, saddr, dev,
498 flags & RT6_LOOKUP_F_IFACE))
499 return sprt;
1da177e4 500 }
dd3abc4e 501 }
1da177e4 502
dd3abc4e 503 if (oif) {
1da177e4
LT		 504 if (local)
505 return local;
506
d420895e 507 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 508 return net->ipv6.ip6_null_entry;
1da177e4 509 }
dd3abc4e 510out:
1da177e4
LT		 511 return rt;
512}
513
27097255 514#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 515struct __rt6_probe_work {
516 struct work_struct work;
517 struct in6_addr target;
518 struct net_device *dev;
519};
520
521static void rt6_probe_deferred(struct work_struct *w)
522{
523 struct in6_addr mcaddr;
524 struct __rt6_probe_work *work =
525 container_of(w, struct __rt6_probe_work, work);
526
527 addrconf_addr_solict_mult(&work->target, &mcaddr);
304d888b 528 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
c2f17e82 529 dev_put(work->dev);
662f5533 530 kfree(work);
c2f17e82
HFS		 531}
532
27097255
YH		 533static void rt6_probe(struct rt6_info *rt)
534{
990edb42 535 struct __rt6_probe_work *work;
f2c31e32 536 struct neighbour *neigh;
27097255
YH		 537 /*
538 * Okay, this does not seem to be appropriate
539 * for now, however, we need to check if it
540 * is really so; aka Router Reachability Probing.
541 *
542 * Router Reachability Probe MUST be rate-limited
543 * to no more than one per minute.
544 */
2152caea 545 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 546 return;
2152caea
YH		 547 rcu_read_lock_bh();
548 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
549 if (neigh) {
8d6c31bf
MKL		 550 if (neigh->nud_state & NUD_VALID)
551 goto out;
552
990edb42 553 work = NULL;
2152caea 554 write_lock(&neigh->lock);
990edb42
MKL		 555 if (!(neigh->nud_state & NUD_VALID) &&
556 time_after(jiffies,
557 neigh->updated +
558 rt->rt6i_idev->cnf.rtr_probe_interval)) {
559 work = kmalloc(sizeof(*work), GFP_ATOMIC);
560 if (work)
561 __neigh_set_probe_once(neigh);
c2f17e82 562 }
2152caea 563 write_unlock(&neigh->lock);
990edb42
MKL		 564 } else {
565 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 566 }
990edb42
MKL		 567
568 if (work) {
569 INIT_WORK(&work->work, rt6_probe_deferred);
570 work->target = rt->rt6i_gateway;
571 dev_hold(rt->dst.dev);
572 work->dev = rt->dst.dev;
573 schedule_work(&work->work);
574 }
575
8d6c31bf 576out:
2152caea 577 rcu_read_unlock_bh();
27097255
YH		 578}
579#else
580static inline void rt6_probe(struct rt6_info *rt)
581{
27097255
YH		 582}
583#endif
584
1da177e4 585/*
554cfb7e 586 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 587 */
b6f99a21 588static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 589{
d1918542 590 struct net_device *dev = rt->dst.dev;
161980f4 591 if (!oif || dev->ifindex == oif)
554cfb7e 592 return 2;
161980f4
DM		 593 if ((dev->flags & IFF_LOOPBACK) &&
594 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
595 return 1;
596 return 0;
554cfb7e 597}
1da177e4 598
afc154e9 599static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 600{
f2c31e32 601 struct neighbour *neigh;
afc154e9 602 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 603
4d0c5911
YH		 604 if (rt->rt6i_flags & RTF_NONEXTHOP ||
605 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 606 return RT6_NUD_SUCCEED;
145a3621
YH		 607
608 rcu_read_lock_bh();
609 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
610 if (neigh) {
611 read_lock(&neigh->lock);
554cfb7e 612 if (neigh->nud_state & NUD_VALID)
afc154e9 613 ret = RT6_NUD_SUCCEED;
398bcbeb 614#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 615 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 616 ret = RT6_NUD_SUCCEED;
7e980569
JB		 617 else
618 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 619#endif
145a3621 620 read_unlock(&neigh->lock);
afc154e9
HFS		 621 } else {
622 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 623 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 624 }
145a3621
YH		 625 rcu_read_unlock_bh();
626
a5a81f0b 627 return ret;
1da177e4
LT		 628}
629
554cfb7e
YH		 630static int rt6_score_route(struct rt6_info *rt, int oif,
631 int strict)
1da177e4 632{
a5a81f0b 633 int m;
1ab1457c 634
4d0c5911 635 m = rt6_check_dev(rt, oif);
77d16f45 636 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 637 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 638#ifdef CONFIG_IPV6_ROUTER_PREF
639 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
640#endif
afc154e9
HFS		 641 if (strict & RT6_LOOKUP_F_REACHABLE) {
642 int n = rt6_check_neigh(rt);
643 if (n < 0)
644 return n;
645 }
554cfb7e
YH		 646 return m;
647}
648
f11e6659 649static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 650 int *mpri, struct rt6_info *match,
651 bool *do_rr)
554cfb7e 652{
f11e6659 653 int m;
afc154e9 654 bool match_do_rr = false;
35103d11
AG		 655 struct inet6_dev *idev = rt->rt6i_idev;
656 struct net_device *dev = rt->dst.dev;
657
658 if (dev && !netif_carrier_ok(dev) &&
659 idev->cnf.ignore_routes_with_linkdown)
660 goto out;
f11e6659
DM		 661
662 if (rt6_check_expired(rt))
663 goto out;
664
665 m = rt6_score_route(rt, oif, strict);
7e980569 666 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 667 match_do_rr = true;
668 m = 0; /* lowest valid score */
7e980569 669 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 670 goto out;
afc154e9
HFS		 671 }
672
673 if (strict & RT6_LOOKUP_F_REACHABLE)
674 rt6_probe(rt);
f11e6659 675
7e980569 676 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 677 if (m > *mpri) {
afc154e9 678 *do_rr = match_do_rr;
f11e6659
DM		 679 *mpri = m;
680 match = rt;
f11e6659 681 }
f11e6659
DM		 682out:
683 return match;
684}
685
686static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
687 struct rt6_info *rr_head,
afc154e9
HFS		 688 u32 metric, int oif, int strict,
689 bool *do_rr)
f11e6659 690{
9fbdcfaf 691 struct rt6_info *rt, *match, *cont;
554cfb7e 692 int mpri = -1;
1da177e4 693
f11e6659 694 match = NULL;
9fbdcfaf
SK		 695 cont = NULL;
696 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
697 if (rt->rt6i_metric != metric) {
698 cont = rt;
699 break;
700 }
701
702 match = find_match(rt, oif, strict, &mpri, match, do_rr);
703 }
704
705 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
706 if (rt->rt6i_metric != metric) {
707 cont = rt;
708 break;
709 }
710
afc154e9 711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 712 }
713
714 if (match || !cont)
715 return match;
716
717 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 719
f11e6659
DM		 720 return match;
721}
1da177e4 722
f11e6659
DM		 723static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
724{
725 struct rt6_info *match, *rt0;
8ed67789 726 struct net *net;
afc154e9 727 bool do_rr = false;
1da177e4 728
f11e6659
DM		 729 rt0 = fn->rr_ptr;
730 if (!rt0)
731 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 732
afc154e9
HFS		 733 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 &do_rr);
1da177e4 735
afc154e9 736 if (do_rr) {
d8d1f30b 737 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 738
554cfb7e 739 /* no entries matched; do round-robin */
f11e6659
DM		 740 if (!next || next->rt6i_metric != rt0->rt6i_metric)
741 next = fn->leaf;
742
743 if (next != rt0)
744 fn->rr_ptr = next;
1da177e4 745 }
1da177e4 746
d1918542 747 net = dev_net(rt0->dst.dev);
a02cec21 748 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 749}
750
8b9df265
MKL		 751static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
752{
753 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
754}
755
70ceb4f5
YH		 756#ifdef CONFIG_IPV6_ROUTE_INFO
757int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 758 const struct in6_addr *gwaddr)
70ceb4f5 759{
c346dca1 760 struct net *net = dev_net(dev);
70ceb4f5
YH		 761 struct route_info *rinfo = (struct route_info *) opt;
762 struct in6_addr prefix_buf, *prefix;
763 unsigned int pref;
4bed72e4 764 unsigned long lifetime;
70ceb4f5
YH		 765 struct rt6_info *rt;
766
767 if (len < sizeof(struct route_info)) {
768 return -EINVAL;
769 }
770
771 /* Sanity check for prefix_len and length */
772 if (rinfo->length > 3) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 128) {
775 return -EINVAL;
776 } else if (rinfo->prefix_len > 64) {
777 if (rinfo->length < 2) {
778 return -EINVAL;
779 }
780 } else if (rinfo->prefix_len > 0) {
781 if (rinfo->length < 1) {
782 return -EINVAL;
783 }
784 }
785
786 pref = rinfo->route_pref;
787 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 788 return -EINVAL;
70ceb4f5 789
4bed72e4 790 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 791
792 if (rinfo->length == 3)
793 prefix = (struct in6_addr *)rinfo->prefix;
794 else {
795 /* this function is safe */
796 ipv6_addr_prefix(&prefix_buf,
797 (struct in6_addr *)rinfo->prefix,
798 rinfo->prefix_len);
799 prefix = &prefix_buf;
800 }
801
f104a567
DJ		 802 if (rinfo->prefix_len == 0)
803 rt = rt6_get_dflt_router(gwaddr, dev);
804 else
805 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
806 gwaddr, dev->ifindex);
70ceb4f5
YH		 807
808 if (rt && !lifetime) {
e0a1ad73 809 ip6_del_rt(rt);
70ceb4f5
YH		 810 rt = NULL;
811 }
812
813 if (!rt && lifetime)
efa2cea0 814 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 815 pref);
816 else if (rt)
817 rt->rt6i_flags = RTF_ROUTEINFO |
818 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
819
820 if (rt) {
1716a961
G		 821 if (!addrconf_finite_timeout(lifetime))
822 rt6_clean_expires(rt);
823 else
824 rt6_set_expires(rt, jiffies + HZ * lifetime);
825
94e187c0 826 ip6_rt_put(rt);
70ceb4f5
YH		 827 }
828 return 0;
829}
830#endif
831
a3c00e46
MKL		 832static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
833 struct in6_addr *saddr)
834{
835 struct fib6_node *pn;
836 while (1) {
837 if (fn->fn_flags & RTN_TL_ROOT)
838 return NULL;
839 pn = fn->parent;
840 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
841 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
842 else
843 fn = pn;
844 if (fn->fn_flags & RTN_RTINFO)
845 return fn;
846 }
847}
c71099ac 848
8ed67789
DL		 849static struct rt6_info *ip6_pol_route_lookup(struct net *net,
850 struct fib6_table *table,
4c9483b2 851 struct flowi6 *fl6, int flags)
1da177e4
LT		 852{
853 struct fib6_node *fn;
854 struct rt6_info *rt;
855
c71099ac 856 read_lock_bh(&table->tb6_lock);
4c9483b2 857 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 858restart:
859 rt = fn->leaf;
4c9483b2 860 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 861 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 862 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 863 if (rt == net->ipv6.ip6_null_entry) {
864 fn = fib6_backtrack(fn, &fl6->saddr);
865 if (fn)
866 goto restart;
867 }
d8d1f30b 868 dst_use(&rt->dst, jiffies);
c71099ac 869 read_unlock_bh(&table->tb6_lock);
b811580d
DA		 870
871 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
872
c71099ac
TG		 873 return rt;
874
875}
876
67ba4152 877struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 878 int flags)
879{
880 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
881}
882EXPORT_SYMBOL_GPL(ip6_route_lookup);
883
9acd9f3a
YH		 884struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
885 const struct in6_addr *saddr, int oif, int strict)
c71099ac 886{
4c9483b2
DM		 887 struct flowi6 fl6 = {
888 .flowi6_oif = oif,
889 .daddr = *daddr,
c71099ac
TG		 890 };
891 struct dst_entry *dst;
77d16f45 892 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 893
adaa70bb 894 if (saddr) {
4c9483b2 895 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 896 flags |= RT6_LOOKUP_F_HAS_SADDR;
897 }
898
4c9483b2 899 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 900 if (dst->error == 0)
901 return (struct rt6_info *) dst;
902
903 dst_release(dst);
904
1da177e4
LT		 905 return NULL;
906}
7159039a
YH		 907EXPORT_SYMBOL(rt6_lookup);
908
c71099ac 909/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 910 It takes new route entry, the addition fails by any reason the
911 route is freed. In any case, if caller does not hold it, it may
912 be destroyed.
913 */
914
e5fd387a 915static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 916 struct mx6_config *mxc)
1da177e4
LT		 917{
918 int err;
c71099ac 919 struct fib6_table *table;
1da177e4 920
c71099ac
TG		 921 table = rt->rt6i_table;
922 write_lock_bh(&table->tb6_lock);
e715b6d3 923 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 924 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 925
926 return err;
927}
928
40e22e8f
TG		 929int ip6_ins_rt(struct rt6_info *rt)
930{
e715b6d3
FW		 931 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
932 struct mx6_config mxc = { .mx = NULL, };
933
934 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 935}
936
8b9df265
MKL		 937static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
938 const struct in6_addr *daddr,
939 const struct in6_addr *saddr)
1da177e4 940{
1da177e4
LT		 941 struct rt6_info *rt;
942
943 /*
944 * Clone the route.
945 */
946
d52d3997 947 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 948 ort = (struct rt6_info *)ort->dst.from;
1da177e4 949
ad706862 950 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 951
952 if (!rt)
953 return NULL;
954
955 ip6_rt_copy_init(rt, ort);
956 rt->rt6i_flags |= RTF_CACHE;
957 rt->rt6i_metric = 0;
958 rt->dst.flags |= DST_HOST;
959 rt->rt6i_dst.addr = *daddr;
960 rt->rt6i_dst.plen = 128;
1da177e4 961
83a09abd
MKL		 962 if (!rt6_is_gw_or_nonexthop(ort)) {
963 if (ort->rt6i_dst.plen != 128 &&
964 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
965 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 966#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 967 if (rt->rt6i_src.plen && saddr) {
968 rt->rt6i_src.addr = *saddr;
969 rt->rt6i_src.plen = 128;
8b9df265 970 }
83a09abd 971#endif
95a9a5ba 972 }
1da177e4 973
95a9a5ba
YH		 974 return rt;
975}
1da177e4 976
d52d3997
MKL		 977static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
978{
979 struct rt6_info *pcpu_rt;
980
981 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 982 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 983
984 if (!pcpu_rt)
985 return NULL;
986 ip6_rt_copy_init(pcpu_rt, rt);
987 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
988 pcpu_rt->rt6i_flags |= RTF_PCPU;
989 return pcpu_rt;
990}
991
992/* It should be called with read_lock_bh(&tb6_lock) acquired */
993static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
994{
a73e4195 995 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 996
997 p = this_cpu_ptr(rt->rt6i_pcpu);
998 pcpu_rt = *p;
999
a73e4195
MKL		 1000 if (pcpu_rt) {
1001 dst_hold(&pcpu_rt->dst);
1002 rt6_dst_from_metrics_check(pcpu_rt);
1003 }
1004 return pcpu_rt;
1005}
1006
1007static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1008{
9c7370a1 1009 struct fib6_table *table = rt->rt6i_table;
a73e4195 1010 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1011
1012 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1013 if (!pcpu_rt) {
1014 struct net *net = dev_net(rt->dst.dev);
1015
9c7370a1
MKL		 1016 dst_hold(&net->ipv6.ip6_null_entry->dst);
1017 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1018 }
1019
9c7370a1
MKL		 1020 read_lock_bh(&table->tb6_lock);
1021 if (rt->rt6i_pcpu) {
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 prev = cmpxchg(p, NULL, pcpu_rt);
1024 if (prev) {
1025 /* If someone did it before us, return prev instead */
1026 dst_destroy(&pcpu_rt->dst);
1027 pcpu_rt = prev;
1028 }
1029 } else {
1030 /* rt has been removed from the fib6 tree
1031 * before we have a chance to acquire the read_lock.
1032 * In this case, don't brother to create a pcpu rt
1033 * since rt is going away anyway. The next
1034 * dst_check() will trigger a re-lookup.
1035 */
d52d3997 1036 dst_destroy(&pcpu_rt->dst);
9c7370a1 1037 pcpu_rt = rt;
d52d3997 1038 }
d52d3997
MKL		 1039 dst_hold(&pcpu_rt->dst);
1040 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1041 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1042 return pcpu_rt;
1043}
1044
8ed67789 1045static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
4c9483b2 1046 struct flowi6 *fl6, int flags)
1da177e4 1047{
367efcb9 1048 struct fib6_node *fn, *saved_fn;
45e4fd26 1049 struct rt6_info *rt;
c71099ac 1050 int strict = 0;
1da177e4 1051
77d16f45 1052 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1055
c71099ac 1056 read_lock_bh(&table->tb6_lock);
1da177e4 1057
4c9483b2 1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1059 saved_fn = fn;
1da177e4 1060
ca254490
DA		 1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
a3c00e46 1064redo_rt6_select:
367efcb9 1065 rt = rt6_select(fn, oif, strict);
52bd4c0c 1066 if (rt->rt6i_nsiblings)
367efcb9 1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
367efcb9
MKL		 1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
367efcb9 1077 }
a3c00e46
MKL		 1078 }
1079
fb9de91e 1080
3da59bd9 1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
b811580d
DA		 1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
d52d3997 1088 return rt;
3da59bd9
MKL		 1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
d52d3997
MKL		 1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
3da59bd9
MKL		 1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
c71099ac 1104
3da59bd9 1105 if (uncached_rt)
8d0b94af 1106 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1109
3da59bd9 1110 dst_hold(&uncached_rt->dst);
b811580d
DA		 1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
3da59bd9 1113 return uncached_rt;
3da59bd9 1114
d52d3997
MKL		 1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1123
9c7370a1
MKL		 1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
a73e4195 1133 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1134 dst_release(&rt->dst);
1135 }
d52d3997 1136
b811580d 1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
d52d3997 1138 return pcpu_rt;
9c7370a1 1139
d52d3997 1140 }
1da177e4
LT		 1141}
1142
8ed67789 1143static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1144 struct flowi6 *fl6, int flags)
4acad72d 1145{
4c9483b2 1146 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1147}
1148
72331bc0
SL		 1149static struct dst_entry *ip6_route_input_lookup(struct net *net,
1150 struct net_device *dev,
1151 struct flowi6 *fl6, int flags)
1152{
1153 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1154 flags |= RT6_LOOKUP_F_IFACE;
1155
1156 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1157}
1158
c71099ac
TG		 1159void ip6_route_input(struct sk_buff *skb)
1160{
b71d1d42 1161 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1162 struct net *net = dev_net(skb->dev);
adaa70bb 1163 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1164 struct ip_tunnel_info *tun_info;
4c9483b2 1165 struct flowi6 fl6 = {
ca254490 1166 .flowi6_iif = l3mdev_fib_oif(skb->dev),
4c9483b2
DM		 1167 .daddr = iph->daddr,
1168 .saddr = iph->saddr,
6502ca52 1169 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1170 .flowi6_mark = skb->mark,
1171 .flowi6_proto = iph->nexthdr,
c71099ac 1172 };
adaa70bb 1173
904af04d 1174 tun_info = skb_tunnel_info(skb);
46fa062a 1175 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1176 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1177 skb_dst_drop(skb);
72331bc0 1178 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1179}
1180
8ed67789 1181static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1182 struct flowi6 *fl6, int flags)
1da177e4 1183{
4c9483b2 1184 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1185}
1186
6f21c96a
PA		 1187struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1188 struct flowi6 *fl6, int flags)
c71099ac 1189{
ca254490 1190 struct dst_entry *dst;
d46a9d67 1191 bool any_src;
c71099ac 1192
ca254490
DA		 1193 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1194 if (dst)
1195 return dst;
1196
1fb9489b 1197 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1198
d46a9d67 1199 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1200 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1201 (fl6->flowi6_oif && any_src))
77d16f45 1202 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1203
d46a9d67 1204 if (!any_src)
adaa70bb 1205 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1206 else if (sk)
1207 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1208
4c9483b2 1209 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1210}
6f21c96a 1211EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 1212
2774c131 1213struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1214{
5c1e6aa3 1215 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1216 struct dst_entry *new = NULL;
1217
f5b0a874 1218 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1219 if (rt) {
0a1f5962 1220 rt6_info_init(rt);
8104891b 1221
0a1f5962 1222 new = &rt->dst;
14e50e57 1223 new->__use = 1;
352e512c 1224 new->input = dst_discard;
ede2059d 1225 new->output = dst_discard_out;
14e50e57 1226
0a1f5962 1227 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1228 rt->rt6i_idev = ort->rt6i_idev;
1229 if (rt->rt6i_idev)
1230 in6_dev_hold(rt->rt6i_idev);
14e50e57 1231
4e3fd7a0 1232 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1233 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1234 rt->rt6i_metric = 0;
1235
1236 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1237#ifdef CONFIG_IPV6_SUBTREES
1238 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1239#endif
1240
1241 dst_free(new);
1242 }
1243
69ead7af
DM		 1244 dst_release(dst_orig);
1245 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1246}
14e50e57 1247
1da177e4
LT		 1248/*
1249 * Destination cache support functions
1250 */
1251
4b32b5ad
MKL		 1252static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1253{
1254 if (rt->dst.from &&
1255 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1256 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1257}
1258
3da59bd9
MKL		 1259static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1260{
1261 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1262 return NULL;
1263
1264 if (rt6_check_expired(rt))
1265 return NULL;
1266
1267 return &rt->dst;
1268}
1269
1270static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1271{
5973fb1e
MKL		 1272 if (!__rt6_check_expired(rt) &&
1273 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
3da59bd9
MKL		 1274 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1275 return &rt->dst;
1276 else
1277 return NULL;
1278}
1279
1da177e4
LT		 1280static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1281{
1282 struct rt6_info *rt;
1283
1284 rt = (struct rt6_info *) dst;
1285
6f3118b5
ND		 1286 /* All IPV6 dsts are created with ->obsolete set to the value
1287 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1288 * into this function always.
1289 */
e3bc10bd 1290
4b32b5ad
MKL		 1291 rt6_dst_from_metrics_check(rt);
1292
02bcf4e0
MKL		 1293 if (rt->rt6i_flags & RTF_PCPU ||
1294 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
3da59bd9
MKL		 1295 return rt6_dst_from_check(rt, cookie);
1296 else
1297 return rt6_check(rt, cookie);
1da177e4
LT		 1298}
1299
1300static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1301{
1302 struct rt6_info *rt = (struct rt6_info *) dst;
1303
1304 if (rt) {
54c1a859
YH		 1305 if (rt->rt6i_flags & RTF_CACHE) {
1306 if (rt6_check_expired(rt)) {
1307 ip6_del_rt(rt);
1308 dst = NULL;
1309 }
1310 } else {
1da177e4 1311 dst_release(dst);
54c1a859
YH		 1312 dst = NULL;
1313 }
1da177e4 1314 }
54c1a859 1315 return dst;
1da177e4
LT		 1316}
1317
1318static void ip6_link_failure(struct sk_buff *skb)
1319{
1320 struct rt6_info *rt;
1321
3ffe533c 1322 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1323
adf30907 1324 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1325 if (rt) {
1eb4f758
HFS		 1326 if (rt->rt6i_flags & RTF_CACHE) {
1327 dst_hold(&rt->dst);
8e3d5be7 1328 ip6_del_rt(rt);
1eb4f758 1329 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1330 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1331 }
1da177e4
LT		 1332 }
1333}
1334
45e4fd26
MKL		 1335static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1336{
1337 struct net *net = dev_net(rt->dst.dev);
1338
1339 rt->rt6i_flags |= RTF_MODIFIED;
1340 rt->rt6i_pmtu = mtu;
1341 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1342}
1343
0d3f6d29
MKL		 1344static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1345{
1346 return !(rt->rt6i_flags & RTF_CACHE) &&
1347 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1348}
1349
45e4fd26
MKL		 1350static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1351 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1352{
67ba4152 1353 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1354
45e4fd26
MKL		 1355 if (rt6->rt6i_flags & RTF_LOCAL)
1356 return;
81aded24 1357
45e4fd26
MKL		 1358 dst_confirm(dst);
1359 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1360 if (mtu >= dst_mtu(dst))
1361 return;
9d289715 1362
0d3f6d29 1363 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26
MKL		 1364 rt6_do_update_pmtu(rt6, mtu);
1365 } else {
1366 const struct in6_addr *daddr, *saddr;
1367 struct rt6_info *nrt6;
1368
1369 if (iph) {
1370 daddr = &iph->daddr;
1371 saddr = &iph->saddr;
1372 } else if (sk) {
1373 daddr = &sk->sk_v6_daddr;
1374 saddr = &inet6_sk(sk)->saddr;
1375 } else {
1376 return;
1377 }
1378 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1379 if (nrt6) {
1380 rt6_do_update_pmtu(nrt6, mtu);
1381
1382 /* ip6_ins_rt(nrt6) will bump the
1383 * rt6->rt6i_node->fn_sernum
1384 * which will fail the next rt6_check() and
1385 * invalidate the sk->sk_dst_cache.
1386 */
1387 ip6_ins_rt(nrt6);
1388 }
1da177e4
LT		 1389 }
1390}
1391
45e4fd26
MKL		 1392static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1393 struct sk_buff *skb, u32 mtu)
1394{
1395 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1396}
1397
42ae66c8
DM		 1398void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1399 int oif, u32 mark)
81aded24
DM		 1400{
1401 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1402 struct dst_entry *dst;
1403 struct flowi6 fl6;
1404
1405 memset(&fl6, 0, sizeof(fl6));
1406 fl6.flowi6_oif = oif;
1b3c61dc 1407 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1408 fl6.daddr = iph->daddr;
1409 fl6.saddr = iph->saddr;
6502ca52 1410 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1411
1412 dst = ip6_route_output(net, NULL, &fl6);
1413 if (!dst->error)
45e4fd26 1414 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1415 dst_release(dst);
1416}
1417EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1418
1419void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1420{
33c162a9
MKL		 1421 struct dst_entry *dst;
1422
81aded24
DM		 1423 ip6_update_pmtu(skb, sock_net(sk), mtu,
1424 sk->sk_bound_dev_if, sk->sk_mark);
33c162a9
MKL		 1425
1426 dst = __sk_dst_get(sk);
1427 if (!dst || !dst->obsolete ||
1428 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1429 return;
1430
1431 bh_lock_sock(sk);
1432 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1433 ip6_datagram_dst_update(sk, false);
1434 bh_unlock_sock(sk);
81aded24
DM		 1435}
1436EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1437
b55b76b2
DJ		 1438/* Handle redirects */
1439struct ip6rd_flowi {
1440 struct flowi6 fl6;
1441 struct in6_addr gateway;
1442};
1443
1444static struct rt6_info *__ip6_route_redirect(struct net *net,
1445 struct fib6_table *table,
1446 struct flowi6 *fl6,
1447 int flags)
1448{
1449 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1450 struct rt6_info *rt;
1451 struct fib6_node *fn;
1452
1453 /* Get the "current" route for this destination and
1454 * check if the redirect has come from approriate router.
1455 *
1456 * RFC 4861 specifies that redirects should only be
1457 * accepted if they come from the nexthop to the target.
1458 * Due to the way the routes are chosen, this notion
1459 * is a bit fuzzy and one might need to check all possible
1460 * routes.
1461 */
1462
1463 read_lock_bh(&table->tb6_lock);
1464 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1465restart:
1466 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1467 if (rt6_check_expired(rt))
1468 continue;
1469 if (rt->dst.error)
1470 break;
1471 if (!(rt->rt6i_flags & RTF_GATEWAY))
1472 continue;
1473 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1474 continue;
1475 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1476 continue;
1477 break;
1478 }
1479
1480 if (!rt)
1481 rt = net->ipv6.ip6_null_entry;
1482 else if (rt->dst.error) {
1483 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1484 goto out;
1485 }
1486
1487 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1488 fn = fib6_backtrack(fn, &fl6->saddr);
1489 if (fn)
1490 goto restart;
b55b76b2 1491 }
a3c00e46 1492
b0a1ba59 1493out:
b55b76b2
DJ		 1494 dst_hold(&rt->dst);
1495
1496 read_unlock_bh(&table->tb6_lock);
1497
b811580d 1498 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
b55b76b2
DJ		 1499 return rt;
1500};
1501
1502static struct dst_entry *ip6_route_redirect(struct net *net,
1503 const struct flowi6 *fl6,
1504 const struct in6_addr *gateway)
1505{
1506 int flags = RT6_LOOKUP_F_HAS_SADDR;
1507 struct ip6rd_flowi rdfl;
1508
1509 rdfl.fl6 = *fl6;
1510 rdfl.gateway = *gateway;
1511
1512 return fib6_rule_lookup(net, &rdfl.fl6,
1513 flags, __ip6_route_redirect);
1514}
1515
3a5ad2ee
DM		 1516void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1517{
1518 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1519 struct dst_entry *dst;
1520 struct flowi6 fl6;
1521
1522 memset(&fl6, 0, sizeof(fl6));
e374c618 1523 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1524 fl6.flowi6_oif = oif;
1525 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1526 fl6.daddr = iph->daddr;
1527 fl6.saddr = iph->saddr;
6502ca52 1528 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1529
b55b76b2
DJ		 1530 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1531 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1532 dst_release(dst);
1533}
1534EXPORT_SYMBOL_GPL(ip6_redirect);
1535
c92a59ec
DJ		 1536void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1537 u32 mark)
1538{
1539 const struct ipv6hdr *iph = ipv6_hdr(skb);
1540 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1541 struct dst_entry *dst;
1542 struct flowi6 fl6;
1543
1544 memset(&fl6, 0, sizeof(fl6));
e374c618 1545 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1546 fl6.flowi6_oif = oif;
1547 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1548 fl6.daddr = msg->dest;
1549 fl6.saddr = iph->daddr;
1550
b55b76b2
DJ		 1551 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1552 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1553 dst_release(dst);
1554}
1555
3a5ad2ee
DM		 1556void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1557{
1558 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1559}
1560EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1561
0dbaee3b 1562static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1563{
0dbaee3b
DM		 1564 struct net_device *dev = dst->dev;
1565 unsigned int mtu = dst_mtu(dst);
1566 struct net *net = dev_net(dev);
1567
1da177e4
LT		 1568 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1569
5578689a
DL		 1570 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1571 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1572
1573 /*
1ab1457c
YH		 1574 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1575 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1576 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1577 * rely only on pmtu discovery"
1578 */
1579 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1580 mtu = IPV6_MAXPLEN;
1581 return mtu;
1582}
1583
ebb762f2 1584static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1585{
4b32b5ad
MKL		 1586 const struct rt6_info *rt = (const struct rt6_info *)dst;
1587 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1588 struct inet6_dev *idev;
618f9bc7 1589
4b32b5ad
MKL		 1590 if (mtu)
1591 goto out;
1592
1593 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1594 if (mtu)
30f78d8e 1595 goto out;
618f9bc7
SK		 1596
1597 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1598
1599 rcu_read_lock();
1600 idev = __in6_dev_get(dst->dev);
1601 if (idev)
1602 mtu = idev->cnf.mtu6;
1603 rcu_read_unlock();
1604
30f78d8e
ED		 1605out:
1606 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1607}
1608
3b00944c
YH		 1609static struct dst_entry *icmp6_dst_gc_list;
1610static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1611
3b00944c 1612struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1613 struct flowi6 *fl6)
1da177e4 1614{
87a11578 1615 struct dst_entry *dst;
1da177e4
LT		 1616 struct rt6_info *rt;
1617 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1618 struct net *net = dev_net(dev);
1da177e4 1619
38308473 1620 if (unlikely(!idev))
122bdf67 1621 return ERR_PTR(-ENODEV);
1da177e4 1622
ad706862 1623 rt = ip6_dst_alloc(net, dev, 0);
38308473 1624 if (unlikely(!rt)) {
1da177e4 1625 in6_dev_put(idev);
87a11578 1626 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1627 goto out;
1628 }
1629
8e2ec639
YZ		 1630 rt->dst.flags |= DST_HOST;
1631 rt->dst.output = ip6_output;
d8d1f30b 1632 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1633 rt->rt6i_gateway = fl6->daddr;
87a11578 1634 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1635 rt->rt6i_dst.plen = 128;
1636 rt->rt6i_idev = idev;
14edd87d 1637 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1638
3b00944c 1639 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1640 rt->dst.next = icmp6_dst_gc_list;
1641 icmp6_dst_gc_list = &rt->dst;
3b00944c 1642 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1643
5578689a 1644 fib6_force_start_gc(net);
1da177e4 1645
87a11578
DM		 1646 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1647
1da177e4 1648out:
87a11578 1649 return dst;
1da177e4
LT		 1650}
1651
3d0f24a7 1652int icmp6_dst_gc(void)
1da177e4 1653{
e9476e95 1654 struct dst_entry *dst, **pprev;
3d0f24a7 1655 int more = 0;
1da177e4 1656
3b00944c
YH		 1657 spin_lock_bh(&icmp6_dst_lock);
1658 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1659
1da177e4
LT		 1660 while ((dst = *pprev) != NULL) {
1661 if (!atomic_read(&dst->__refcnt)) {
1662 *pprev = dst->next;
1663 dst_free(dst);
1da177e4
LT		 1664 } else {
1665 pprev = &dst->next;
3d0f24a7 1666 ++more;
1da177e4
LT		 1667 }
1668 }
1669
3b00944c 1670 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1671
3d0f24a7 1672 return more;
1da177e4
LT		 1673}
1674
1e493d19
DM		 1675static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1676 void *arg)
1677{
1678 struct dst_entry *dst, **pprev;
1679
1680 spin_lock_bh(&icmp6_dst_lock);
1681 pprev = &icmp6_dst_gc_list;
1682 while ((dst = *pprev) != NULL) {
1683 struct rt6_info *rt = (struct rt6_info *) dst;
1684 if (func(rt, arg)) {
1685 *pprev = dst->next;
1686 dst_free(dst);
1687 } else {
1688 pprev = &dst->next;
1689 }
1690 }
1691 spin_unlock_bh(&icmp6_dst_lock);
1692}
1693
569d3645 1694static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1695{
86393e52 1696 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1697 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1698 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1699 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1700 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1701 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1702 int entries;
7019b78e 1703
fc66f95c 1704 entries = dst_entries_get_fast(ops);
49a18d86 1705 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1706 entries <= rt_max_size)
1da177e4
LT		 1707 goto out;
1708
6891a346 1709 net->ipv6.ip6_rt_gc_expire++;
14956643 1710 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1711 entries = dst_entries_get_slow(ops);
1712 if (entries < ops->gc_thresh)
7019b78e 1713 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1714out:
7019b78e 1715 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1716 return entries > rt_max_size;
1da177e4
LT		 1717}
1718
e715b6d3
FW		 1719static int ip6_convert_metrics(struct mx6_config *mxc,
1720 const struct fib6_config *cfg)
1721{
c3a8d947 1722 bool ecn_ca = false;
e715b6d3
FW		 1723 struct nlattr *nla;
1724 int remaining;
1725 u32 *mp;
1726
63159f29 1727 if (!cfg->fc_mx)
e715b6d3
FW		 1728 return 0;
1729
1730 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1731 if (unlikely(!mp))
1732 return -ENOMEM;
1733
1734 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1735 int type = nla_type(nla);
1bb14807 1736 u32 val;
e715b6d3 1737
1bb14807
DB		 1738 if (!type)
1739 continue;
1740 if (unlikely(type > RTAX_MAX))
1741 goto err;
ea697639 1742
1bb14807
DB		 1743 if (type == RTAX_CC_ALGO) {
1744 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1745
1bb14807 1746 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1747 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1748 if (val == TCP_CA_UNSPEC)
1749 goto err;
1750 } else {
1751 val = nla_get_u32(nla);
e715b6d3 1752 }
626abd59
PA		 1753 if (type == RTAX_HOPLIMIT && val > 255)
1754 val = 255;
b8d3e416
DB		 1755 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1756 goto err;
1bb14807
DB		 1757
1758 mp[type - 1] = val;
1759 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1760 }
1761
c3a8d947
DB		 1762 if (ecn_ca) {
1763 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1764 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1765 }
e715b6d3 1766
c3a8d947 1767 mxc->mx = mp;
e715b6d3
FW		 1768 return 0;
1769 err:
1770 kfree(mp);
1771 return -EINVAL;
1772}
1da177e4 1773
8c5b83f0 1774static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1775{
5578689a 1776 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1777 struct rt6_info *rt = NULL;
1778 struct net_device *dev = NULL;
1779 struct inet6_dev *idev = NULL;
c71099ac 1780 struct fib6_table *table;
1da177e4 1781 int addr_type;
8c5b83f0 1782 int err = -EINVAL;
1da177e4 1783
86872cb5 1784 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1785 goto out;
1da177e4 1786#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1787 if (cfg->fc_src_len)
8c5b83f0 1788 goto out;
1da177e4 1789#endif
86872cb5 1790 if (cfg->fc_ifindex) {
1da177e4 1791 err = -ENODEV;
5578689a 1792 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1793 if (!dev)
1794 goto out;
1795 idev = in6_dev_get(dev);
1796 if (!idev)
1797 goto out;
1798 }
1799
86872cb5
TG		 1800 if (cfg->fc_metric == 0)
1801 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1802
d71314b4 1803 err = -ENOBUFS;
38308473
DM		 1804 if (cfg->fc_nlinfo.nlh &&
1805 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1806 table = fib6_get_table(net, cfg->fc_table);
38308473 1807 if (!table) {
f3213831 1808 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1809 table = fib6_new_table(net, cfg->fc_table);
1810 }
1811 } else {
1812 table = fib6_new_table(net, cfg->fc_table);
1813 }
38308473
DM		 1814
1815 if (!table)
c71099ac 1816 goto out;
c71099ac 1817
ad706862
MKL		 1818 rt = ip6_dst_alloc(net, NULL,
1819 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1820
38308473 1821 if (!rt) {
1da177e4
LT		 1822 err = -ENOMEM;
1823 goto out;
1824 }
1825
1716a961
G		 1826 if (cfg->fc_flags & RTF_EXPIRES)
1827 rt6_set_expires(rt, jiffies +
1828 clock_t_to_jiffies(cfg->fc_expires));
1829 else
1830 rt6_clean_expires(rt);
1da177e4 1831
86872cb5
TG		 1832 if (cfg->fc_protocol == RTPROT_UNSPEC)
1833 cfg->fc_protocol = RTPROT_BOOT;
1834 rt->rt6i_protocol = cfg->fc_protocol;
1835
1836 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1837
1838 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1839 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1840 else if (cfg->fc_flags & RTF_LOCAL)
1841 rt->dst.input = ip6_input;
1da177e4 1842 else
d8d1f30b 1843 rt->dst.input = ip6_forward;
1da177e4 1844
d8d1f30b 1845 rt->dst.output = ip6_output;
1da177e4 1846
19e42e45
RP		 1847 if (cfg->fc_encap) {
1848 struct lwtunnel_state *lwtstate;
1849
1850 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1851 cfg->fc_encap, AF_INET6, cfg,
1852 &lwtstate);
19e42e45
RP		 1853 if (err)
1854 goto out;
61adedf3
JB		 1855 rt->dst.lwtstate = lwtstate_get(lwtstate);
1856 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1857 rt->dst.lwtstate->orig_output = rt->dst.output;
1858 rt->dst.output = lwtunnel_output;
25368623 1859 }
61adedf3
JB		 1860 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1861 rt->dst.lwtstate->orig_input = rt->dst.input;
1862 rt->dst.input = lwtunnel_input;
25368623 1863 }
19e42e45
RP		 1864 }
1865
86872cb5
TG		 1866 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1867 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1868 if (rt->rt6i_dst.plen == 128)
e5fd387a 1869 rt->dst.flags |= DST_HOST;
e5fd387a 1870
1da177e4 1871#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1872 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1873 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1874#endif
1875
86872cb5 1876 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1877
1878 /* We cannot add true routes via loopback here,
1879 they would result in kernel looping; promote them to reject routes
1880 */
86872cb5 1881 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1882 (dev && (dev->flags & IFF_LOOPBACK) &&
1883 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1884 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1885 /* hold loopback dev/idev if we haven't done so. */
5578689a 1886 if (dev != net->loopback_dev) {
1da177e4
LT		 1887 if (dev) {
1888 dev_put(dev);
1889 in6_dev_put(idev);
1890 }
5578689a 1891 dev = net->loopback_dev;
1da177e4
LT		 1892 dev_hold(dev);
1893 idev = in6_dev_get(dev);
1894 if (!idev) {
1895 err = -ENODEV;
1896 goto out;
1897 }
1898 }
1da177e4 1899 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1900 switch (cfg->fc_type) {
1901 case RTN_BLACKHOLE:
1902 rt->dst.error = -EINVAL;
ede2059d 1903 rt->dst.output = dst_discard_out;
7150aede 1904 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1905 break;
1906 case RTN_PROHIBIT:
1907 rt->dst.error = -EACCES;
7150aede
K		 1908 rt->dst.output = ip6_pkt_prohibit_out;
1909 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1910 break;
b4949ab2 1911 case RTN_THROW:
0315e382 1912 case RTN_UNREACHABLE:
ef2c7d7b 1913 default:
7150aede 1914 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1915 : (cfg->fc_type == RTN_UNREACHABLE)
1916 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1917 rt->dst.output = ip6_pkt_discard_out;
1918 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1919 break;
1920 }
1da177e4
LT		 1921 goto install_route;
1922 }
1923
86872cb5 1924 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1925 const struct in6_addr *gw_addr;
1da177e4
LT		 1926 int gwa_type;
1927
86872cb5 1928 gw_addr = &cfg->fc_gateway;
330567b7 1929 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1930
1931 /* if gw_addr is local we will fail to detect this in case
1932 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1933 * will return already-added prefix route via interface that
1934 * prefix route was assigned to, which might be non-loopback.
1935 */
1936 err = -EINVAL;
330567b7
FW		 1937 if (ipv6_chk_addr_and_flags(net, gw_addr,
1938 gwa_type & IPV6_ADDR_LINKLOCAL ?
1939 dev : NULL, 0, 0))
48ed7b26
FW		 1940 goto out;
1941
4e3fd7a0 1942 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1943
1944 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1945 struct rt6_info *grt;
1946
1947 /* IPv6 strictly inhibits using not link-local
1948 addresses as nexthop address.
1949 Otherwise, router will not able to send redirects.
1950 It is very good, but in some (rare!) circumstances
1951 (SIT, PtP, NBMA NOARP links) it is handy to allow
1952 some exceptions. --ANK
1953 */
38308473 1954 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1955 goto out;
1956
5578689a 1957 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1958
1959 err = -EHOSTUNREACH;
38308473 1960 if (!grt)
1da177e4
LT		 1961 goto out;
1962 if (dev) {
d1918542 1963 if (dev != grt->dst.dev) {
94e187c0 1964 ip6_rt_put(grt);
1da177e4
LT		 1965 goto out;
1966 }
1967 } else {
d1918542 1968 dev = grt->dst.dev;
1da177e4
LT		 1969 idev = grt->rt6i_idev;
1970 dev_hold(dev);
1971 in6_dev_hold(grt->rt6i_idev);
1972 }
38308473 1973 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1974 err = 0;
94e187c0 1975 ip6_rt_put(grt);
1da177e4
LT		 1976
1977 if (err)
1978 goto out;
1979 }
1980 err = -EINVAL;
38308473 1981 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1982 goto out;
1983 }
1984
1985 err = -ENODEV;
38308473 1986 if (!dev)
1da177e4
LT		 1987 goto out;
1988
c3968a85
DW		 1989 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1990 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1991 err = -EINVAL;
1992 goto out;
1993 }
4e3fd7a0 1994 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1995 rt->rt6i_prefsrc.plen = 128;
1996 } else
1997 rt->rt6i_prefsrc.plen = 0;
1998
86872cb5 1999 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2000
2001install_route:
d8d1f30b 2002 rt->dst.dev = dev;
1da177e4 2003 rt->rt6i_idev = idev;
c71099ac 2004 rt->rt6i_table = table;
63152fc0 2005
c346dca1 2006 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2007
8c5b83f0 2008 return rt;
6b9ea5a6
RP		 2009out:
2010 if (dev)
2011 dev_put(dev);
2012 if (idev)
2013 in6_dev_put(idev);
2014 if (rt)
2015 dst_free(&rt->dst);
2016
8c5b83f0 2017 return ERR_PTR(err);
6b9ea5a6
RP		 2018}
2019
2020int ip6_route_add(struct fib6_config *cfg)
2021{
2022 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2023 struct rt6_info *rt;
6b9ea5a6
RP		 2024 int err;
2025
8c5b83f0
RP		 2026 rt = ip6_route_info_create(cfg);
2027 if (IS_ERR(rt)) {
2028 err = PTR_ERR(rt);
2029 rt = NULL;
6b9ea5a6 2030 goto out;
8c5b83f0 2031 }
6b9ea5a6 2032
e715b6d3
FW		 2033 err = ip6_convert_metrics(&mxc, cfg);
2034 if (err)
2035 goto out;
1da177e4 2036
e715b6d3
FW		 2037 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2038
2039 kfree(mxc.mx);
6b9ea5a6 2040
e715b6d3 2041 return err;
1da177e4 2042out:
1da177e4 2043 if (rt)
d8d1f30b 2044 dst_free(&rt->dst);
6b9ea5a6 2045
1da177e4
LT		 2046 return err;
2047}
2048
86872cb5 2049static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2050{
2051 int err;
c71099ac 2052 struct fib6_table *table;
d1918542 2053 struct net *net = dev_net(rt->dst.dev);
1da177e4 2054
8e3d5be7
MKL		 2055 if (rt == net->ipv6.ip6_null_entry ||
2056 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2057 err = -ENOENT;
2058 goto out;
2059 }
6c813a72 2060
c71099ac
TG		 2061 table = rt->rt6i_table;
2062 write_lock_bh(&table->tb6_lock);
86872cb5 2063 err = fib6_del(rt, info);
c71099ac 2064 write_unlock_bh(&table->tb6_lock);
1da177e4 2065
6825a26c 2066out:
94e187c0 2067 ip6_rt_put(rt);
1da177e4
LT		 2068 return err;
2069}
2070
e0a1ad73
TG		 2071int ip6_del_rt(struct rt6_info *rt)
2072{
4d1169c1 2073 struct nl_info info = {
d1918542 2074 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2075 };
528c4ceb 2076 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2077}
2078
86872cb5 2079static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2080{
c71099ac 2081 struct fib6_table *table;
1da177e4
LT		 2082 struct fib6_node *fn;
2083 struct rt6_info *rt;
2084 int err = -ESRCH;
2085
5578689a 2086 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2087 if (!table)
c71099ac
TG		 2088 return err;
2089
2090 read_lock_bh(&table->tb6_lock);
1da177e4 2091
c71099ac 2092 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2093 &cfg->fc_dst, cfg->fc_dst_len,
2094 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2095
1da177e4 2096 if (fn) {
d8d1f30b 2097 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2098 if ((rt->rt6i_flags & RTF_CACHE) &&
2099 !(cfg->fc_flags & RTF_CACHE))
2100 continue;
86872cb5 2101 if (cfg->fc_ifindex &&
d1918542
DM		 2102 (!rt->dst.dev ||
2103 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2104 continue;
86872cb5
TG		 2105 if (cfg->fc_flags & RTF_GATEWAY &&
2106 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2107 continue;
86872cb5 2108 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2109 continue;
d8d1f30b 2110 dst_hold(&rt->dst);
c71099ac 2111 read_unlock_bh(&table->tb6_lock);
1da177e4 2112
86872cb5 2113 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2114 }
2115 }
c71099ac 2116 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2117
2118 return err;
2119}
2120
6700c270 2121static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2122{
a6279458 2123 struct netevent_redirect netevent;
e8599ff4 2124 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2125 struct ndisc_options ndopts;
2126 struct inet6_dev *in6_dev;
2127 struct neighbour *neigh;
71bcdba0 2128 struct rd_msg *msg;
6e157b6a
DM		 2129 int optlen, on_link;
2130 u8 *lladdr;
e8599ff4 2131
29a3cad5 2132 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2133 optlen -= sizeof(*msg);
e8599ff4
DM		 2134
2135 if (optlen < 0) {
6e157b6a 2136 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2137 return;
2138 }
2139
71bcdba0 2140 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2141
71bcdba0 2142 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2143 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2144 return;
2145 }
2146
6e157b6a 2147 on_link = 0;
71bcdba0 2148 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2149 on_link = 1;
71bcdba0 2150 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2151 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2152 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2153 return;
2154 }
2155
2156 in6_dev = __in6_dev_get(skb->dev);
2157 if (!in6_dev)
2158 return;
2159 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2160 return;
2161
2162 /* RFC2461 8.1:
2163 * The IP source address of the Redirect MUST be the same as the current
2164 * first-hop router for the specified ICMP Destination Address.
2165 */
2166
71bcdba0 2167 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2168 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2169 return;
2170 }
6e157b6a
DM		 2171
2172 lladdr = NULL;
e8599ff4
DM		 2173 if (ndopts.nd_opts_tgt_lladdr) {
2174 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2175 skb->dev);
2176 if (!lladdr) {
2177 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2178 return;
2179 }
2180 }
2181
6e157b6a 2182 rt = (struct rt6_info *) dst;
ec13ad1d 2183 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2184 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2185 return;
6e157b6a 2186 }
e8599ff4 2187
6e157b6a
DM		 2188 /* Redirect received -> path was valid.
2189 * Look, redirects are sent only in response to data packets,
2190 * so that this nexthop apparently is reachable. --ANK
2191 */
2192 dst_confirm(&rt->dst);
a6279458 2193
71bcdba0 2194 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2195 if (!neigh)
2196 return;
a6279458 2197
1da177e4
LT		 2198 /*
2199 * We have finally decided to accept it.
2200 */
2201
1ab1457c 2202 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2203 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2204 NEIGH_UPDATE_F_OVERRIDE|
2205 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2206 NEIGH_UPDATE_F_ISROUTER))
2207 );
2208
83a09abd 2209 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2210 if (!nrt)
1da177e4
LT		 2211 goto out;
2212
2213 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2214 if (on_link)
2215 nrt->rt6i_flags &= ~RTF_GATEWAY;
2216
4e3fd7a0 2217 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2218
40e22e8f 2219 if (ip6_ins_rt(nrt))
1da177e4
LT		 2220 goto out;
2221
d8d1f30b
CG		 2222 netevent.old = &rt->dst;
2223 netevent.new = &nrt->dst;
71bcdba0 2224 netevent.daddr = &msg->dest;
60592833 2225 netevent.neigh = neigh;
8d71740c
TT		 2226 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2227
38308473 2228 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2229 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2230 ip6_del_rt(rt);
1da177e4
LT		 2231 }
2232
2233out:
e8599ff4 2234 neigh_release(neigh);
6e157b6a
DM		 2235}
2236
1da177e4
LT		 2237/*
2238 * Misc support functions
2239 */
2240
4b32b5ad
MKL		 2241static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2242{
2243 BUG_ON(from->dst.from);
2244
2245 rt->rt6i_flags &= ~RTF_EXPIRES;
2246 dst_hold(&from->dst);
2247 rt->dst.from = &from->dst;
2248 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2249}
2250
83a09abd
MKL		 2251static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2252{
2253 rt->dst.input = ort->dst.input;
2254 rt->dst.output = ort->dst.output;
2255 rt->rt6i_dst = ort->rt6i_dst;
2256 rt->dst.error = ort->dst.error;
2257 rt->rt6i_idev = ort->rt6i_idev;
2258 if (rt->rt6i_idev)
2259 in6_dev_hold(rt->rt6i_idev);
2260 rt->dst.lastuse = jiffies;
2261 rt->rt6i_gateway = ort->rt6i_gateway;
2262 rt->rt6i_flags = ort->rt6i_flags;
2263 rt6_set_from(rt, ort);
2264 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2265#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2266 rt->rt6i_src = ort->rt6i_src;
1da177e4 2267#endif
83a09abd
MKL		 2268 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2269 rt->rt6i_table = ort->rt6i_table;
61adedf3 2270 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2271}
2272
70ceb4f5 2273#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2274static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2275 const struct in6_addr *prefix, int prefixlen,
2276 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2277{
2278 struct fib6_node *fn;
2279 struct rt6_info *rt = NULL;
c71099ac
TG		 2280 struct fib6_table *table;
2281
efa2cea0 2282 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2283 if (!table)
c71099ac 2284 return NULL;
70ceb4f5 2285
5744dd9b 2286 read_lock_bh(&table->tb6_lock);
67ba4152 2287 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2288 if (!fn)
2289 goto out;
2290
d8d1f30b 2291 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2292 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2293 continue;
2294 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2295 continue;
2296 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2297 continue;
d8d1f30b 2298 dst_hold(&rt->dst);
70ceb4f5
YH		 2299 break;
2300 }
2301out:
5744dd9b 2302 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2303 return rt;
2304}
2305
efa2cea0 2306static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2307 const struct in6_addr *prefix, int prefixlen,
2308 const struct in6_addr *gwaddr, int ifindex,
95c96174 2309 unsigned int pref)
70ceb4f5 2310{
86872cb5 2311 struct fib6_config cfg = {
238fc7ea 2312 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2313 .fc_ifindex = ifindex,
2314 .fc_dst_len = prefixlen,
2315 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2316 RTF_UP | RTF_PREF(pref),
15e47304 2317 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2318 .fc_nlinfo.nlh = NULL,
2319 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2320 };
2321
ca254490 2322 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2323 cfg.fc_dst = *prefix;
2324 cfg.fc_gateway = *gwaddr;
70ceb4f5 2325
e317da96
YH		 2326 /* We should treat it as a default route if prefix length is 0. */
2327 if (!prefixlen)
86872cb5 2328 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2329
86872cb5 2330 ip6_route_add(&cfg);
70ceb4f5 2331
efa2cea0 2332 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2333}
2334#endif
2335
b71d1d42 2336struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2337{
1da177e4 2338 struct rt6_info *rt;
c71099ac 2339 struct fib6_table *table;
1da177e4 2340
c346dca1 2341 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2342 if (!table)
c71099ac 2343 return NULL;
1da177e4 2344
5744dd9b 2345 read_lock_bh(&table->tb6_lock);
67ba4152 2346 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2347 if (dev == rt->dst.dev &&
045927ff 2348 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2349 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2350 break;
2351 }
2352 if (rt)
d8d1f30b 2353 dst_hold(&rt->dst);
5744dd9b 2354 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2355 return rt;
2356}
2357
b71d1d42 2358struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2359 struct net_device *dev,
2360 unsigned int pref)
1da177e4 2361{
86872cb5 2362 struct fib6_config cfg = {
ca254490 2363 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2364 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2365 .fc_ifindex = dev->ifindex,
2366 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2367 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2368 .fc_nlinfo.portid = 0,
5578689a 2369 .fc_nlinfo.nlh = NULL,
c346dca1 2370 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2371 };
1da177e4 2372
4e3fd7a0 2373 cfg.fc_gateway = *gwaddr;
1da177e4 2374
86872cb5 2375 ip6_route_add(&cfg);
1da177e4 2376
1da177e4
LT		 2377 return rt6_get_dflt_router(gwaddr, dev);
2378}
2379
7b4da532 2380void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2381{
2382 struct rt6_info *rt;
c71099ac
TG		 2383 struct fib6_table *table;
2384
2385 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2386 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2387 if (!table)
c71099ac 2388 return;
1da177e4
LT		 2389
2390restart:
c71099ac 2391 read_lock_bh(&table->tb6_lock);
d8d1f30b 2392 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2393 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2394 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2395 dst_hold(&rt->dst);
c71099ac 2396 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2397 ip6_del_rt(rt);
1da177e4
LT		 2398 goto restart;
2399 }
2400 }
c71099ac 2401 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2402}
2403
5578689a
DL		 2404static void rtmsg_to_fib6_config(struct net *net,
2405 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2406 struct fib6_config *cfg)
2407{
2408 memset(cfg, 0, sizeof(*cfg));
2409
ca254490
DA		 2410 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2411 : RT6_TABLE_MAIN;
86872cb5
TG		 2412 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2413 cfg->fc_metric = rtmsg->rtmsg_metric;
2414 cfg->fc_expires = rtmsg->rtmsg_info;
2415 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2416 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2417 cfg->fc_flags = rtmsg->rtmsg_flags;
2418
5578689a 2419 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2420
4e3fd7a0
AD		 2421 cfg->fc_dst = rtmsg->rtmsg_dst;
2422 cfg->fc_src = rtmsg->rtmsg_src;
2423 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2424}
2425
5578689a 2426int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2427{
86872cb5 2428 struct fib6_config cfg;
1da177e4
LT		 2429 struct in6_rtmsg rtmsg;
2430 int err;
2431
67ba4152 2432 switch (cmd) {
1da177e4
LT		 2433 case SIOCADDRT: /* Add a route */
2434 case SIOCDELRT: /* Delete a route */
af31f412 2435 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2436 return -EPERM;
2437 err = copy_from_user(&rtmsg, arg,
2438 sizeof(struct in6_rtmsg));
2439 if (err)
2440 return -EFAULT;
86872cb5 2441
5578689a 2442 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2443
1da177e4
LT		 2444 rtnl_lock();
2445 switch (cmd) {
2446 case SIOCADDRT:
86872cb5 2447 err = ip6_route_add(&cfg);
1da177e4
LT		 2448 break;
2449 case SIOCDELRT:
86872cb5 2450 err = ip6_route_del(&cfg);
1da177e4
LT		 2451 break;
2452 default:
2453 err = -EINVAL;
2454 }
2455 rtnl_unlock();
2456
2457 return err;
3ff50b79 2458 }
1da177e4
LT		 2459
2460 return -EINVAL;
2461}
2462
2463/*
2464 * Drop the packet on the floor
2465 */
2466
d5fdd6ba 2467static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2468{
612f09e8 2469 int type;
adf30907 2470 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2471 switch (ipstats_mib_noroutes) {
2472 case IPSTATS_MIB_INNOROUTES:
0660e03f 2473 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2474 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2475 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2476 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2477 break;
2478 }
2479 /* FALLTHROUGH */
2480 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2481 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2482 ipstats_mib_noroutes);
612f09e8
YH		 2483 break;
2484 }
3ffe533c 2485 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2486 kfree_skb(skb);
2487 return 0;
2488}
2489
9ce8ade0
TG		 2490static int ip6_pkt_discard(struct sk_buff *skb)
2491{
612f09e8 2492 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2493}
2494
ede2059d 2495static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2496{
adf30907 2497 skb->dev = skb_dst(skb)->dev;
612f09e8 2498 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2499}
2500
9ce8ade0
TG		 2501static int ip6_pkt_prohibit(struct sk_buff *skb)
2502{
612f09e8 2503 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2504}
2505
ede2059d 2506static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2507{
adf30907 2508 skb->dev = skb_dst(skb)->dev;
612f09e8 2509 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2510}
2511
1da177e4
LT		 2512/*
2513 * Allocate a dst for local (unicast / anycast) address.
2514 */
2515
2516struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2517 const struct in6_addr *addr,
8f031519 2518 bool anycast)
1da177e4 2519{
ca254490 2520 u32 tb_id;
c346dca1 2521 struct net *net = dev_net(idev->dev);
a3300ef4 2522 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2523 DST_NOCOUNT);
a3300ef4 2524 if (!rt)
1da177e4
LT		 2525 return ERR_PTR(-ENOMEM);
2526
1da177e4
LT		 2527 in6_dev_hold(idev);
2528
11d53b49 2529 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2530 rt->dst.input = ip6_input;
2531 rt->dst.output = ip6_output;
1da177e4 2532 rt->rt6i_idev = idev;
1da177e4
LT		 2533
2534 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2535 if (anycast)
2536 rt->rt6i_flags |= RTF_ANYCAST;
2537 else
1da177e4 2538 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2539
550bab42 2540 rt->rt6i_gateway = *addr;
4e3fd7a0 2541 rt->rt6i_dst.addr = *addr;
1da177e4 2542 rt->rt6i_dst.plen = 128;
ca254490
DA		 2543 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2544 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2545 rt->dst.flags |= DST_NOCACHE;
1da177e4 2546
d8d1f30b 2547 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2548
2549 return rt;
2550}
2551
c3968a85
DW		 2552int ip6_route_get_saddr(struct net *net,
2553 struct rt6_info *rt,
b71d1d42 2554 const struct in6_addr *daddr,
c3968a85
DW		 2555 unsigned int prefs,
2556 struct in6_addr *saddr)
2557{
e16e888b
MS		 2558 struct inet6_dev *idev =
2559 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2560 int err = 0;
e16e888b 2561 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2562 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2563 else
2564 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2565 daddr, prefs, saddr);
2566 return err;
2567}
2568
2569/* remove deleted ip from prefsrc entries */
2570struct arg_dev_net_ip {
2571 struct net_device *dev;
2572 struct net *net;
2573 struct in6_addr *addr;
2574};
2575
2576static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2577{
2578 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2579 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2580 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2581
d1918542 2582 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2583 rt != net->ipv6.ip6_null_entry &&
2584 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2585 /* remove prefsrc entry */
2586 rt->rt6i_prefsrc.plen = 0;
2587 }
2588 return 0;
2589}
2590
2591void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2592{
2593 struct net *net = dev_net(ifp->idev->dev);
2594 struct arg_dev_net_ip adni = {
2595 .dev = ifp->idev->dev,
2596 .net = net,
2597 .addr = &ifp->addr,
2598 };
0c3584d5 2599 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2600}
2601
be7a010d
DJ		 2602#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2603#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2604
2605/* Remove routers and update dst entries when gateway turn into host. */
2606static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2607{
2608 struct in6_addr *gateway = (struct in6_addr *)arg;
2609
2610 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2611 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2612 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2613 return -1;
2614 }
2615 return 0;
2616}
2617
2618void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2619{
2620 fib6_clean_all(net, fib6_clean_tohost, gateway);
2621}
2622
8ed67789
DL		 2623struct arg_dev_net {
2624 struct net_device *dev;
2625 struct net *net;
2626};
2627
1da177e4
LT		 2628static int fib6_ifdown(struct rt6_info *rt, void *arg)
2629{
bc3ef660 2630 const struct arg_dev_net *adn = arg;
2631 const struct net_device *dev = adn->dev;
8ed67789 2632
d1918542 2633 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2634 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2635 return -1;
c159d30c 2636
1da177e4
LT		 2637 return 0;
2638}
2639
f3db4851 2640void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2641{
8ed67789
DL		 2642 struct arg_dev_net adn = {
2643 .dev = dev,
2644 .net = net,
2645 };
2646
0c3584d5 2647 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2648 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2649 if (dev)
2650 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2651}
2652
95c96174 2653struct rt6_mtu_change_arg {
1da177e4 2654 struct net_device *dev;
95c96174 2655 unsigned int mtu;
1da177e4
LT		 2656};
2657
2658static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2659{
2660 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2661 struct inet6_dev *idev;
2662
2663 /* In IPv6 pmtu discovery is not optional,
2664 so that RTAX_MTU lock cannot disable it.
2665 We still use this lock to block changes
2666 caused by addrconf/ndisc.
2667 */
2668
2669 idev = __in6_dev_get(arg->dev);
38308473 2670 if (!idev)
1da177e4
LT		 2671 return 0;
2672
2673 /* For administrative MTU increase, there is no way to discover
2674 IPv6 PMTU increase, so PMTU increase should be updated here.
2675 Since RFC 1981 doesn't include administrative MTU increase
2676 update PMTU increase is a MUST. (i.e. jumbo frame)
2677 */
2678 /*
2679 If new MTU is less than route PMTU, this new MTU will be the
2680 lowest MTU in the path, update the route PMTU to reflect PMTU
2681 decreases; if new MTU is greater than route PMTU, and the
2682 old MTU is the lowest MTU in the path, update the route PMTU
2683 to reflect the increase. In this case if the other nodes' MTU
2684 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2685 PMTU discouvery.
2686 */
d1918542 2687 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2688 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2689 if (rt->rt6i_flags & RTF_CACHE) {
2690 /* For RTF_CACHE with rt6i_pmtu == 0
2691 * (i.e. a redirected route),
2692 * the metrics of its rt->dst.from has already
2693 * been updated.
2694 */
2695 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2696 rt->rt6i_pmtu = arg->mtu;
2697 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2698 (dst_mtu(&rt->dst) < arg->mtu &&
2699 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2700 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2701 }
566cfd8f 2702 }
1da177e4
LT		 2703 return 0;
2704}
2705
95c96174 2706void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2707{
c71099ac
TG		 2708 struct rt6_mtu_change_arg arg = {
2709 .dev = dev,
2710 .mtu = mtu,
2711 };
1da177e4 2712
0c3584d5 2713 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2714}
2715
ef7c79ed 2716static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2717 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2718 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2719 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2720 [RTA_PRIORITY] = { .type = NLA_U32 },
2721 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2722 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2723 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2724 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2725 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2726 [RTA_EXPIRES] = { .type = NLA_U32 },
86872cb5
TG		 2727};
2728
2729static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2730 struct fib6_config *cfg)
1da177e4 2731{
86872cb5
TG		 2732 struct rtmsg *rtm;
2733 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2734 unsigned int pref;
86872cb5 2735 int err;
1da177e4 2736
86872cb5
TG		 2737 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2738 if (err < 0)
2739 goto errout;
1da177e4 2740
86872cb5
TG		 2741 err = -EINVAL;
2742 rtm = nlmsg_data(nlh);
2743 memset(cfg, 0, sizeof(*cfg));
2744
2745 cfg->fc_table = rtm->rtm_table;
2746 cfg->fc_dst_len = rtm->rtm_dst_len;
2747 cfg->fc_src_len = rtm->rtm_src_len;
2748 cfg->fc_flags = RTF_UP;
2749 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2750 cfg->fc_type = rtm->rtm_type;
86872cb5 2751
ef2c7d7b
ND		 2752 if (rtm->rtm_type == RTN_UNREACHABLE ||
2753 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2754 rtm->rtm_type == RTN_PROHIBIT ||
2755 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2756 cfg->fc_flags |= RTF_REJECT;
2757
ab79ad14
MŻ		 2758 if (rtm->rtm_type == RTN_LOCAL)
2759 cfg->fc_flags |= RTF_LOCAL;
2760
1f56a01f
MKL		 2761 if (rtm->rtm_flags & RTM_F_CLONED)
2762 cfg->fc_flags |= RTF_CACHE;
2763
15e47304 2764 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2765 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2766 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2767
2768 if (tb[RTA_GATEWAY]) {
67b61f6c 2769 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2770 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2771 }
86872cb5
TG		 2772
2773 if (tb[RTA_DST]) {
2774 int plen = (rtm->rtm_dst_len + 7) >> 3;
2775
2776 if (nla_len(tb[RTA_DST]) < plen)
2777 goto errout;
2778
2779 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2780 }
86872cb5
TG		 2781
2782 if (tb[RTA_SRC]) {
2783 int plen = (rtm->rtm_src_len + 7) >> 3;
2784
2785 if (nla_len(tb[RTA_SRC]) < plen)
2786 goto errout;
2787
2788 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2789 }
86872cb5 2790
c3968a85 2791 if (tb[RTA_PREFSRC])
67b61f6c 2792 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2793
86872cb5
TG		 2794 if (tb[RTA_OIF])
2795 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2796
2797 if (tb[RTA_PRIORITY])
2798 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2799
2800 if (tb[RTA_METRICS]) {
2801 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2802 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2803 }
86872cb5
TG		 2804
2805 if (tb[RTA_TABLE])
2806 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2807
51ebd318
ND		 2808 if (tb[RTA_MULTIPATH]) {
2809 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2810 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2811 }
2812
c78ba6d6
LR		 2813 if (tb[RTA_PREF]) {
2814 pref = nla_get_u8(tb[RTA_PREF]);
2815 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2816 pref != ICMPV6_ROUTER_PREF_HIGH)
2817 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2818 cfg->fc_flags |= RTF_PREF(pref);
2819 }
2820
19e42e45
RP		 2821 if (tb[RTA_ENCAP])
2822 cfg->fc_encap = tb[RTA_ENCAP];
2823
2824 if (tb[RTA_ENCAP_TYPE])
2825 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2826
32bc201e
XL		 2827 if (tb[RTA_EXPIRES]) {
2828 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2829
2830 if (addrconf_finite_timeout(timeout)) {
2831 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2832 cfg->fc_flags |= RTF_EXPIRES;
2833 }
2834 }
2835
86872cb5
TG		 2836 err = 0;
2837errout:
2838 return err;
1da177e4
LT		 2839}
2840
6b9ea5a6
RP		 2841struct rt6_nh {
2842 struct rt6_info *rt6_info;
2843 struct fib6_config r_cfg;
2844 struct mx6_config mxc;
2845 struct list_head next;
2846};
2847
2848static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2849{
2850 struct rt6_nh *nh;
2851
2852 list_for_each_entry(nh, rt6_nh_list, next) {
2853 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2854 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2855 nh->r_cfg.fc_ifindex);
2856 }
2857}
2858
2859static int ip6_route_info_append(struct list_head *rt6_nh_list,
2860 struct rt6_info *rt, struct fib6_config *r_cfg)
2861{
2862 struct rt6_nh *nh;
2863 struct rt6_info *rtnh;
2864 int err = -EEXIST;
2865
2866 list_for_each_entry(nh, rt6_nh_list, next) {
2867 /* check if rt6_info already exists */
2868 rtnh = nh->rt6_info;
2869
2870 if (rtnh->dst.dev == rt->dst.dev &&
2871 rtnh->rt6i_idev == rt->rt6i_idev &&
2872 ipv6_addr_equal(&rtnh->rt6i_gateway,
2873 &rt->rt6i_gateway))
2874 return err;
2875 }
2876
2877 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2878 if (!nh)
2879 return -ENOMEM;
2880 nh->rt6_info = rt;
2881 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2882 if (err) {
2883 kfree(nh);
2884 return err;
2885 }
2886 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2887 list_add_tail(&nh->next, rt6_nh_list);
2888
2889 return 0;
2890}
2891
2892static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2893{
2894 struct fib6_config r_cfg;
2895 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2896 struct rt6_info *rt;
2897 struct rt6_nh *err_nh;
2898 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2899 int remaining;
2900 int attrlen;
6b9ea5a6
RP		 2901 int err = 1;
2902 int nhn = 0;
2903 int replace = (cfg->fc_nlinfo.nlh &&
2904 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2905 LIST_HEAD(rt6_nh_list);
51ebd318 2906
35f1b4e9 2907 remaining = cfg->fc_mp_len;
51ebd318 2908 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2909
6b9ea5a6
RP		 2910 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2911 * rt6_info structs per nexthop
2912 */
51ebd318
ND		 2913 while (rtnh_ok(rtnh, remaining)) {
2914 memcpy(&r_cfg, cfg, sizeof(*cfg));
2915 if (rtnh->rtnh_ifindex)
2916 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2917
2918 attrlen = rtnh_attrlen(rtnh);
2919 if (attrlen > 0) {
2920 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2921
2922 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2923 if (nla) {
67b61f6c 2924 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2925 r_cfg.fc_flags |= RTF_GATEWAY;
2926 }
19e42e45
RP		 2927 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2928 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2929 if (nla)
2930 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2931 }
6b9ea5a6 2932
8c5b83f0
RP		 2933 rt = ip6_route_info_create(&r_cfg);
2934 if (IS_ERR(rt)) {
2935 err = PTR_ERR(rt);
2936 rt = NULL;
6b9ea5a6 2937 goto cleanup;
8c5b83f0 2938 }
6b9ea5a6
RP		 2939
2940 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2941 if (err) {
6b9ea5a6
RP		 2942 dst_free(&rt->dst);
2943 goto cleanup;
2944 }
2945
2946 rtnh = rtnh_next(rtnh, &remaining);
2947 }
2948
2949 err_nh = NULL;
2950 list_for_each_entry(nh, &rt6_nh_list, next) {
2951 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2952 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2953 nh->rt6_info = NULL;
2954 if (err) {
2955 if (replace && nhn)
2956 ip6_print_replace_route_err(&rt6_nh_list);
2957 err_nh = nh;
2958 goto add_errout;
51ebd318 2959 }
6b9ea5a6 2960
1a72418b 2961 /* Because each route is added like a single route we remove
27596472
MK		 2962 * these flags after the first nexthop: if there is a collision,
2963 * we have already failed to add the first nexthop:
2964 * fib6_add_rt2node() has rejected it; when replacing, old
2965 * nexthops have been replaced by first new, the rest should
2966 * be added to it.
1a72418b 2967 */
27596472
MK		 2968 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2969 NLM_F_REPLACE);
6b9ea5a6
RP		 2970 nhn++;
2971 }
2972
2973 goto cleanup;
2974
2975add_errout:
2976 /* Delete routes that were already added */
2977 list_for_each_entry(nh, &rt6_nh_list, next) {
2978 if (err_nh == nh)
2979 break;
2980 ip6_route_del(&nh->r_cfg);
2981 }
2982
2983cleanup:
2984 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2985 if (nh->rt6_info)
2986 dst_free(&nh->rt6_info->dst);
52fe51f8 2987 kfree(nh->mxc.mx);
6b9ea5a6
RP		 2988 list_del(&nh->next);
2989 kfree(nh);
2990 }
2991
2992 return err;
2993}
2994
2995static int ip6_route_multipath_del(struct fib6_config *cfg)
2996{
2997 struct fib6_config r_cfg;
2998 struct rtnexthop *rtnh;
2999 int remaining;
3000 int attrlen;
3001 int err = 1, last_err = 0;
3002
3003 remaining = cfg->fc_mp_len;
3004 rtnh = (struct rtnexthop *)cfg->fc_mp;
3005
3006 /* Parse a Multipath Entry */
3007 while (rtnh_ok(rtnh, remaining)) {
3008 memcpy(&r_cfg, cfg, sizeof(*cfg));
3009 if (rtnh->rtnh_ifindex)
3010 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3011
3012 attrlen = rtnh_attrlen(rtnh);
3013 if (attrlen > 0) {
3014 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3015
3016 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3017 if (nla) {
3018 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3019 r_cfg.fc_flags |= RTF_GATEWAY;
3020 }
3021 }
3022 err = ip6_route_del(&r_cfg);
3023 if (err)
3024 last_err = err;
3025
51ebd318
ND		 3026 rtnh = rtnh_next(rtnh, &remaining);
3027 }
3028
3029 return last_err;
3030}
3031
67ba4152 3032static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3033{
86872cb5
TG		 3034 struct fib6_config cfg;
3035 int err;
1da177e4 3036
86872cb5
TG		 3037 err = rtm_to_fib6_config(skb, nlh, &cfg);
3038 if (err < 0)
3039 return err;
3040
51ebd318 3041 if (cfg.fc_mp)
6b9ea5a6 3042 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3043 else
3044 return ip6_route_del(&cfg);
1da177e4
LT		 3045}
3046
67ba4152 3047static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3048{
86872cb5
TG		 3049 struct fib6_config cfg;
3050 int err;
1da177e4 3051
86872cb5
TG		 3052 err = rtm_to_fib6_config(skb, nlh, &cfg);
3053 if (err < 0)
3054 return err;
3055
51ebd318 3056 if (cfg.fc_mp)
6b9ea5a6 3057 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3058 else
3059 return ip6_route_add(&cfg);
1da177e4
LT		 3060}
3061
19e42e45 3062static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3063{
3064 return NLMSG_ALIGN(sizeof(struct rtmsg))
3065 + nla_total_size(16) /* RTA_SRC */
3066 + nla_total_size(16) /* RTA_DST */
3067 + nla_total_size(16) /* RTA_GATEWAY */
3068 + nla_total_size(16) /* RTA_PREFSRC */
3069 + nla_total_size(4) /* RTA_TABLE */
3070 + nla_total_size(4) /* RTA_IIF */
3071 + nla_total_size(4) /* RTA_OIF */
3072 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3073 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3074 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3075 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3076 + nla_total_size(1) /* RTA_PREF */
61adedf3 3077 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3078}
3079
191cd582
BH		 3080static int rt6_fill_node(struct net *net,
3081 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3082 struct in6_addr *dst, struct in6_addr *src,
15e47304 3083 int iif, int type, u32 portid, u32 seq,
7bc570c8 3084 int prefix, int nowait, unsigned int flags)
1da177e4 3085{
4b32b5ad 3086 u32 metrics[RTAX_MAX];
1da177e4 3087 struct rtmsg *rtm;
2d7202bf 3088 struct nlmsghdr *nlh;
e3703b3d 3089 long expires;
9e762a4a 3090 u32 table;
1da177e4
LT		 3091
3092 if (prefix) { /* user wants prefix routes only */
3093 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3094 /* success since this is not a prefix route */
3095 return 1;
3096 }
3097 }
3098
15e47304 3099 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3100 if (!nlh)
26932566 3101 return -EMSGSIZE;
2d7202bf
TG		 3102
3103 rtm = nlmsg_data(nlh);
1da177e4
LT		 3104 rtm->rtm_family = AF_INET6;
3105 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3106 rtm->rtm_src_len = rt->rt6i_src.plen;
3107 rtm->rtm_tos = 0;
c71099ac 3108 if (rt->rt6i_table)
9e762a4a 3109 table = rt->rt6i_table->tb6_id;
c71099ac 3110 else
9e762a4a
PM		 3111 table = RT6_TABLE_UNSPEC;
3112 rtm->rtm_table = table;
c78679e8
DM		 3113 if (nla_put_u32(skb, RTA_TABLE, table))
3114 goto nla_put_failure;
ef2c7d7b
ND		 3115 if (rt->rt6i_flags & RTF_REJECT) {
3116 switch (rt->dst.error) {
3117 case -EINVAL:
3118 rtm->rtm_type = RTN_BLACKHOLE;
3119 break;
3120 case -EACCES:
3121 rtm->rtm_type = RTN_PROHIBIT;
3122 break;
b4949ab2
ND		 3123 case -EAGAIN:
3124 rtm->rtm_type = RTN_THROW;
3125 break;
ef2c7d7b
ND		 3126 default:
3127 rtm->rtm_type = RTN_UNREACHABLE;
3128 break;
3129 }
3130 }
38308473 3131 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3132 rtm->rtm_type = RTN_LOCAL;
d1918542 3133 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3134 rtm->rtm_type = RTN_LOCAL;
3135 else
3136 rtm->rtm_type = RTN_UNICAST;
3137 rtm->rtm_flags = 0;
35103d11 3138 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3139 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3140 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3141 rtm->rtm_flags |= RTNH_F_DEAD;
3142 }
1da177e4
LT		 3143 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3144 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3145 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3146 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3147 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3148 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3149 rtm->rtm_protocol = RTPROT_RA;
3150 else
3151 rtm->rtm_protocol = RTPROT_KERNEL;
3152 }
1da177e4 3153
38308473 3154 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3155 rtm->rtm_flags |= RTM_F_CLONED;
3156
3157 if (dst) {
930345ea 3158 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3159 goto nla_put_failure;
1ab1457c 3160 rtm->rtm_dst_len = 128;
1da177e4 3161 } else if (rtm->rtm_dst_len)
930345ea 3162 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3163 goto nla_put_failure;
1da177e4
LT		 3164#ifdef CONFIG_IPV6_SUBTREES
3165 if (src) {
930345ea 3166 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3167 goto nla_put_failure;
1ab1457c 3168 rtm->rtm_src_len = 128;
c78679e8 3169 } else if (rtm->rtm_src_len &&
930345ea 3170 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3171 goto nla_put_failure;
1da177e4 3172#endif
7bc570c8
YH		 3173 if (iif) {
3174#ifdef CONFIG_IPV6_MROUTE
3175 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3176 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3177 if (err <= 0) {
3178 if (!nowait) {
3179 if (err == 0)
3180 return 0;
3181 goto nla_put_failure;
3182 } else {
3183 if (err == -EMSGSIZE)
3184 goto nla_put_failure;
3185 }
3186 }
3187 } else
3188#endif
c78679e8
DM		 3189 if (nla_put_u32(skb, RTA_IIF, iif))
3190 goto nla_put_failure;
7bc570c8 3191 } else if (dst) {
1da177e4 3192 struct in6_addr saddr_buf;
c78679e8 3193 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3194 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3195 goto nla_put_failure;
1da177e4 3196 }
2d7202bf 3197
c3968a85
DW		 3198 if (rt->rt6i_prefsrc.plen) {
3199 struct in6_addr saddr_buf;
4e3fd7a0 3200 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3201 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3202 goto nla_put_failure;
c3968a85
DW		 3203 }
3204
4b32b5ad
MKL		 3205 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3206 if (rt->rt6i_pmtu)
3207 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3208 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3209 goto nla_put_failure;
3210
dd0cbf29 3211 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3212 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3213 goto nla_put_failure;
94f826b8 3214 }
2d7202bf 3215
c78679e8
DM		 3216 if (rt->dst.dev &&
3217 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3218 goto nla_put_failure;
3219 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3220 goto nla_put_failure;
8253947e
LW		 3221
3222 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3223
87a50699 3224 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3225 goto nla_put_failure;
2d7202bf 3226
c78ba6d6
LR		 3227 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3228 goto nla_put_failure;
3229
61adedf3 3230 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3231
053c095a
JB		 3232 nlmsg_end(skb, nlh);
3233 return 0;
2d7202bf
TG		 3234
3235nla_put_failure:
26932566
PM		 3236 nlmsg_cancel(skb, nlh);
3237 return -EMSGSIZE;
1da177e4
LT		 3238}
3239
1b43af54 3240int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3241{
3242 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3243 int prefix;
3244
2d7202bf
TG		 3245 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3246 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3247 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3248 } else
3249 prefix = 0;
3250
191cd582
BH		 3251 return rt6_fill_node(arg->net,
3252 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3253 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3254 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3255}
3256
67ba4152 3257static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3258{
3b1e0a65 3259 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3260 struct nlattr *tb[RTA_MAX+1];
3261 struct rt6_info *rt;
1da177e4 3262 struct sk_buff *skb;
ab364a6f 3263 struct rtmsg *rtm;
4c9483b2 3264 struct flowi6 fl6;
72331bc0 3265 int err, iif = 0, oif = 0;
1da177e4 3266
ab364a6f
TG		 3267 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3268 if (err < 0)
3269 goto errout;
1da177e4 3270
ab364a6f 3271 err = -EINVAL;
4c9483b2 3272 memset(&fl6, 0, sizeof(fl6));
1da177e4 3273
ab364a6f
TG		 3274 if (tb[RTA_SRC]) {
3275 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3276 goto errout;
3277
4e3fd7a0 3278 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3279 }
3280
3281 if (tb[RTA_DST]) {
3282 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3283 goto errout;
3284
4e3fd7a0 3285 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3286 }
3287
3288 if (tb[RTA_IIF])
3289 iif = nla_get_u32(tb[RTA_IIF]);
3290
3291 if (tb[RTA_OIF])
72331bc0 3292 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3293
2e47b291
LC		 3294 if (tb[RTA_MARK])
3295 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3296
1da177e4
LT		 3297 if (iif) {
3298 struct net_device *dev;
72331bc0
SL		 3299 int flags = 0;
3300
5578689a 3301 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3302 if (!dev) {
3303 err = -ENODEV;
ab364a6f 3304 goto errout;
1da177e4 3305 }
72331bc0
SL		 3306
3307 fl6.flowi6_iif = iif;
3308
3309 if (!ipv6_addr_any(&fl6.saddr))
3310 flags |= RT6_LOOKUP_F_HAS_SADDR;
3311
3312 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3313 flags);
3314 } else {
3315 fl6.flowi6_oif = oif;
3316
ca254490
DA		 3317 if (netif_index_is_l3_master(net, oif)) {
3318 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3319 FLOWI_FLAG_SKIP_NH_OIF;
3320 }
3321
72331bc0 3322 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3323 }
3324
ab364a6f 3325 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3326 if (!skb) {
94e187c0 3327 ip6_rt_put(rt);
ab364a6f
TG		 3328 err = -ENOBUFS;
3329 goto errout;
3330 }
1da177e4 3331
ab364a6f
TG		 3332 /* Reserve room for dummy headers, this skb can pass
3333 through good chunk of routing engine.
3334 */
459a98ed 3335 skb_reset_mac_header(skb);
ab364a6f 3336 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3337
d8d1f30b 3338 skb_dst_set(skb, &rt->dst);
1da177e4 3339
4c9483b2 3340 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3341 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3342 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3343 if (err < 0) {
ab364a6f
TG		 3344 kfree_skb(skb);
3345 goto errout;
1da177e4
LT		 3346 }
3347
15e47304 3348 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3349errout:
1da177e4 3350 return err;
1da177e4
LT		 3351}
3352
37a1d361
RP		 3353void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3354 unsigned int nlm_flags)
1da177e4
LT		 3355{
3356 struct sk_buff *skb;
5578689a 3357 struct net *net = info->nl_net;
528c4ceb
DL		 3358 u32 seq;
3359 int err;
3360
3361 err = -ENOBUFS;
38308473 3362 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3363
19e42e45 3364 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3365 if (!skb)
21713ebc
TG		 3366 goto errout;
3367
191cd582 3368 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3369 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3370 if (err < 0) {
3371 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3372 WARN_ON(err == -EMSGSIZE);
3373 kfree_skb(skb);
3374 goto errout;
3375 }
15e47304 3376 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3377 info->nlh, gfp_any());
3378 return;
21713ebc
TG		 3379errout:
3380 if (err < 0)
5578689a 3381 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3382}
3383
8ed67789 3384static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3385 unsigned long event, void *ptr)
8ed67789 3386{
351638e7 3387 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3388 struct net *net = dev_net(dev);
8ed67789
DL		 3389
3390 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3391 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3392 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3393#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3394 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3395 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3396 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3397 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3398#endif
3399 }
3400
3401 return NOTIFY_OK;
3402}
3403
1da177e4
LT		 3404/*
3405 * /proc
3406 */
3407
3408#ifdef CONFIG_PROC_FS
3409
33120b30
AD		 3410static const struct file_operations ipv6_route_proc_fops = {
3411 .owner = THIS_MODULE,
3412 .open = ipv6_route_open,
3413 .read = seq_read,
3414 .llseek = seq_lseek,
8d2ca1d7 3415 .release = seq_release_net,
33120b30
AD		 3416};
3417
1da177e4
LT		 3418static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3419{
69ddb805 3420 struct net *net = (struct net *)seq->private;
1da177e4 3421 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3422 net->ipv6.rt6_stats->fib_nodes,
3423 net->ipv6.rt6_stats->fib_route_nodes,
3424 net->ipv6.rt6_stats->fib_rt_alloc,
3425 net->ipv6.rt6_stats->fib_rt_entries,
3426 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3427 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3428 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3429
3430 return 0;
3431}
3432
3433static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3434{
de05c557 3435 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3436}
3437
9a32144e 3438static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3439 .owner = THIS_MODULE,
3440 .open = rt6_stats_seq_open,
3441 .read = seq_read,
3442 .llseek = seq_lseek,
b6fcbdb4 3443 .release = single_release_net,
1da177e4
LT		 3444};
3445#endif /* CONFIG_PROC_FS */
3446
3447#ifdef CONFIG_SYSCTL
3448
1da177e4 3449static
fe2c6338 3450int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3451 void __user *buffer, size_t *lenp, loff_t *ppos)
3452{
c486da34
LAG		 3453 struct net *net;
3454 int delay;
3455 if (!write)
1da177e4 3456 return -EINVAL;
c486da34
LAG		 3457
3458 net = (struct net *)ctl->extra1;
3459 delay = net->ipv6.sysctl.flush_delay;
3460 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3461 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3462 return 0;
1da177e4
LT		 3463}
3464
fe2c6338 3465struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3466 {
1da177e4 3467 .procname = "flush",
4990509f 3468 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3469 .maxlen = sizeof(int),
89c8b3a1 3470 .mode = 0200,
6d9f239a 3471 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3472 },
3473 {
1da177e4 3474 .procname = "gc_thresh",
9a7ec3a9 3475 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3476 .maxlen = sizeof(int),
3477 .mode = 0644,
6d9f239a 3478 .proc_handler = proc_dointvec,
1da177e4
LT		 3479 },
3480 {
1da177e4 3481 .procname = "max_size",
4990509f 3482 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3483 .maxlen = sizeof(int),
3484 .mode = 0644,
6d9f239a 3485 .proc_handler = proc_dointvec,
1da177e4
LT		 3486 },
3487 {
1da177e4 3488 .procname = "gc_min_interval",
4990509f 3489 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3490 .maxlen = sizeof(int),
3491 .mode = 0644,
6d9f239a 3492 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3493 },
3494 {
1da177e4 3495 .procname = "gc_timeout",
4990509f 3496 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3497 .maxlen = sizeof(int),
3498 .mode = 0644,
6d9f239a 3499 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3500 },
3501 {
1da177e4 3502 .procname = "gc_interval",
4990509f 3503 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3504 .maxlen = sizeof(int),
3505 .mode = 0644,
6d9f239a 3506 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3507 },
3508 {
1da177e4 3509 .procname = "gc_elasticity",
4990509f 3510 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3511 .maxlen = sizeof(int),
3512 .mode = 0644,
f3d3f616 3513 .proc_handler = proc_dointvec,
1da177e4
LT		 3514 },
3515 {
1da177e4 3516 .procname = "mtu_expires",
4990509f 3517 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3518 .maxlen = sizeof(int),
3519 .mode = 0644,
6d9f239a 3520 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3521 },
3522 {
1da177e4 3523 .procname = "min_adv_mss",
4990509f 3524 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3525 .maxlen = sizeof(int),
3526 .mode = 0644,
f3d3f616 3527 .proc_handler = proc_dointvec,
1da177e4
LT		 3528 },
3529 {
1da177e4 3530 .procname = "gc_min_interval_ms",
4990509f 3531 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3532 .maxlen = sizeof(int),
3533 .mode = 0644,
6d9f239a 3534 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3535 },
f8572d8f 3536 { }
1da177e4
LT		 3537};
3538
2c8c1e72 3539struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3540{
3541 struct ctl_table *table;
3542
3543 table = kmemdup(ipv6_route_table_template,
3544 sizeof(ipv6_route_table_template),
3545 GFP_KERNEL);
5ee09105
YH		 3546
3547 if (table) {
3548 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3549 table[0].extra1 = net;
86393e52 3550 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3551 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3552 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3553 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3554 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3555 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3556 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3557 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3558 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3559
3560 /* Don't export sysctls to unprivileged users */
3561 if (net->user_ns != &init_user_ns)
3562 table[0].procname = NULL;
5ee09105
YH		 3563 }
3564
760f2d01
DL		 3565 return table;
3566}
1da177e4
LT		 3567#endif
3568
2c8c1e72 3569static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3570{
633d424b 3571 int ret = -ENOMEM;
8ed67789 3572
86393e52
AD		 3573 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3574 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3575
fc66f95c
ED		 3576 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3577 goto out_ip6_dst_ops;
3578
8ed67789
DL		 3579 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3580 sizeof(*net->ipv6.ip6_null_entry),
3581 GFP_KERNEL);
3582 if (!net->ipv6.ip6_null_entry)
fc66f95c 3583 goto out_ip6_dst_entries;
d8d1f30b 3584 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3585 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3586 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3587 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3588 ip6_template_metrics, true);
8ed67789
DL		 3589
3590#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3591 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3592 sizeof(*net->ipv6.ip6_prohibit_entry),
3593 GFP_KERNEL);
68fffc67
PZ		 3594 if (!net->ipv6.ip6_prohibit_entry)
3595 goto out_ip6_null_entry;
d8d1f30b 3596 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3597 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3598 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3599 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3600 ip6_template_metrics, true);
8ed67789
DL		 3601
3602 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3603 sizeof(*net->ipv6.ip6_blk_hole_entry),
3604 GFP_KERNEL);
68fffc67
PZ		 3605 if (!net->ipv6.ip6_blk_hole_entry)
3606 goto out_ip6_prohibit_entry;
d8d1f30b 3607 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3608 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3609 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3610 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3611 ip6_template_metrics, true);
8ed67789
DL		 3612#endif
3613
b339a47c
PZ		 3614 net->ipv6.sysctl.flush_delay = 0;
3615 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3616 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3617 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3618 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3619 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3620 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3621 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3622
6891a346
BT		 3623 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3624
8ed67789
DL		 3625 ret = 0;
3626out:
3627 return ret;
f2fc6a54 3628
68fffc67
PZ		 3629#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3630out_ip6_prohibit_entry:
3631 kfree(net->ipv6.ip6_prohibit_entry);
3632out_ip6_null_entry:
3633 kfree(net->ipv6.ip6_null_entry);
3634#endif
fc66f95c
ED		 3635out_ip6_dst_entries:
3636 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3637out_ip6_dst_ops:
f2fc6a54 3638 goto out;
cdb18761
DL		 3639}
3640
2c8c1e72 3641static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3642{
8ed67789
DL		 3643 kfree(net->ipv6.ip6_null_entry);
3644#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3645 kfree(net->ipv6.ip6_prohibit_entry);
3646 kfree(net->ipv6.ip6_blk_hole_entry);
3647#endif
41bb78b4 3648 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3649}
3650
d189634e
TG		 3651static int __net_init ip6_route_net_init_late(struct net *net)
3652{
3653#ifdef CONFIG_PROC_FS
d4beaa66
G		 3654 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3655 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3656#endif
3657 return 0;
3658}
3659
3660static void __net_exit ip6_route_net_exit_late(struct net *net)
3661{
3662#ifdef CONFIG_PROC_FS
ece31ffd
G		 3663 remove_proc_entry("ipv6_route", net->proc_net);
3664 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3665#endif
3666}
3667
cdb18761
DL		 3668static struct pernet_operations ip6_route_net_ops = {
3669 .init = ip6_route_net_init,
3670 .exit = ip6_route_net_exit,
3671};
3672
c3426b47
DM		 3673static int __net_init ipv6_inetpeer_init(struct net *net)
3674{
3675 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3676
3677 if (!bp)
3678 return -ENOMEM;
3679 inet_peer_base_init(bp);
3680 net->ipv6.peers = bp;
3681 return 0;
3682}
3683
3684static void __net_exit ipv6_inetpeer_exit(struct net *net)
3685{
3686 struct inet_peer_base *bp = net->ipv6.peers;
3687
3688 net->ipv6.peers = NULL;
56a6b248 3689 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3690 kfree(bp);
3691}
3692
2b823f72 3693static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3694 .init = ipv6_inetpeer_init,
3695 .exit = ipv6_inetpeer_exit,
3696};
3697
d189634e
TG		 3698static struct pernet_operations ip6_route_net_late_ops = {
3699 .init = ip6_route_net_init_late,
3700 .exit = ip6_route_net_exit_late,
3701};
3702
8ed67789
DL		 3703static struct notifier_block ip6_route_dev_notifier = {
3704 .notifier_call = ip6_route_dev_notify,
3705 .priority = 0,
3706};
3707
433d49c3 3708int __init ip6_route_init(void)
1da177e4 3709{
433d49c3 3710 int ret;
8d0b94af 3711 int cpu;
433d49c3 3712
9a7ec3a9
DL		 3713 ret = -ENOMEM;
3714 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3715 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3716 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3717 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3718 goto out;
14e50e57 3719
fc66f95c 3720 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3721 if (ret)
bdb3289f 3722 goto out_kmem_cache;
bdb3289f 3723
c3426b47
DM		 3724 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3725 if (ret)
e8803b6c 3726 goto out_dst_entries;
2a0c451a 3727
7e52b33b
DM		 3728 ret = register_pernet_subsys(&ip6_route_net_ops);
3729 if (ret)
3730 goto out_register_inetpeer;
c3426b47 3731
5dc121e9
AE		 3732 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3733
8ed67789
DL		 3734 /* Registering of the loopback is done before this portion of code,
3735 * the loopback reference in rt6_info will not be taken, do it
3736 * manually for init_net */
d8d1f30b 3737 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3738 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3739 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3740 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3741 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3742 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3743 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3744 #endif
e8803b6c 3745 ret = fib6_init();
433d49c3 3746 if (ret)
8ed67789 3747 goto out_register_subsys;
433d49c3 3748
433d49c3
DL		 3749 ret = xfrm6_init();
3750 if (ret)
e8803b6c 3751 goto out_fib6_init;
c35b7e72 3752
433d49c3
DL		 3753 ret = fib6_rules_init();
3754 if (ret)
3755 goto xfrm6_init;
7e5449c2 3756
d189634e
TG		 3757 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3758 if (ret)
3759 goto fib6_rules_init;
3760
433d49c3 3761 ret = -ENOBUFS;
c7ac8679
GR		 3762 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3763 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3764 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3765 goto out_register_late_subsys;
c127ea2c 3766
8ed67789 3767 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3768 if (ret)
d189634e 3769 goto out_register_late_subsys;
8ed67789 3770
8d0b94af
MKL		 3771 for_each_possible_cpu(cpu) {
3772 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3773
3774 INIT_LIST_HEAD(&ul->head);
3775 spin_lock_init(&ul->lock);
3776 }
3777
433d49c3
DL		 3778out:
3779 return ret;
3780
d189634e
TG		 3781out_register_late_subsys:
3782 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3783fib6_rules_init:
433d49c3
DL		 3784 fib6_rules_cleanup();
3785xfrm6_init:
433d49c3 3786 xfrm6_fini();
2a0c451a
TG		 3787out_fib6_init:
3788 fib6_gc_cleanup();
8ed67789
DL		 3789out_register_subsys:
3790 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3791out_register_inetpeer:
3792 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3793out_dst_entries:
3794 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3795out_kmem_cache:
f2fc6a54 3796 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3797 goto out;
1da177e4
LT		 3798}
3799
3800void ip6_route_cleanup(void)
3801{
8ed67789 3802 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3803 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3804 fib6_rules_cleanup();
1da177e4 3805 xfrm6_fini();
1da177e4 3806 fib6_gc_cleanup();
c3426b47 3807 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3808 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3809 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3810 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3811}
Linux 6.x block layer and io_uring tree(s)