projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branches 'acpi-numa', 'acpi-tables' and 'acpi-osi'
[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 }
b8d3e416
DB		 1753 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1754 goto err;
1bb14807
DB		 1755
1756 mp[type - 1] = val;
1757 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1758 }
1759
c3a8d947
DB		 1760 if (ecn_ca) {
1761 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1762 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1763 }
e715b6d3 1764
c3a8d947 1765 mxc->mx = mp;
e715b6d3
FW		 1766 return 0;
1767 err:
1768 kfree(mp);
1769 return -EINVAL;
1770}
1da177e4 1771
8c5b83f0 1772static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1773{
5578689a 1774 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1775 struct rt6_info *rt = NULL;
1776 struct net_device *dev = NULL;
1777 struct inet6_dev *idev = NULL;
c71099ac 1778 struct fib6_table *table;
1da177e4 1779 int addr_type;
8c5b83f0 1780 int err = -EINVAL;
1da177e4 1781
86872cb5 1782 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1783 goto out;
1da177e4 1784#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1785 if (cfg->fc_src_len)
8c5b83f0 1786 goto out;
1da177e4 1787#endif
86872cb5 1788 if (cfg->fc_ifindex) {
1da177e4 1789 err = -ENODEV;
5578689a 1790 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1791 if (!dev)
1792 goto out;
1793 idev = in6_dev_get(dev);
1794 if (!idev)
1795 goto out;
1796 }
1797
86872cb5
TG		 1798 if (cfg->fc_metric == 0)
1799 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1800
d71314b4 1801 err = -ENOBUFS;
38308473
DM		 1802 if (cfg->fc_nlinfo.nlh &&
1803 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1804 table = fib6_get_table(net, cfg->fc_table);
38308473 1805 if (!table) {
f3213831 1806 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1807 table = fib6_new_table(net, cfg->fc_table);
1808 }
1809 } else {
1810 table = fib6_new_table(net, cfg->fc_table);
1811 }
38308473
DM		 1812
1813 if (!table)
c71099ac 1814 goto out;
c71099ac 1815
ad706862
MKL		 1816 rt = ip6_dst_alloc(net, NULL,
1817 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1818
38308473 1819 if (!rt) {
1da177e4
LT		 1820 err = -ENOMEM;
1821 goto out;
1822 }
1823
1716a961
G		 1824 if (cfg->fc_flags & RTF_EXPIRES)
1825 rt6_set_expires(rt, jiffies +
1826 clock_t_to_jiffies(cfg->fc_expires));
1827 else
1828 rt6_clean_expires(rt);
1da177e4 1829
86872cb5
TG		 1830 if (cfg->fc_protocol == RTPROT_UNSPEC)
1831 cfg->fc_protocol = RTPROT_BOOT;
1832 rt->rt6i_protocol = cfg->fc_protocol;
1833
1834 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1835
1836 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1837 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1838 else if (cfg->fc_flags & RTF_LOCAL)
1839 rt->dst.input = ip6_input;
1da177e4 1840 else
d8d1f30b 1841 rt->dst.input = ip6_forward;
1da177e4 1842
d8d1f30b 1843 rt->dst.output = ip6_output;
1da177e4 1844
19e42e45
RP		 1845 if (cfg->fc_encap) {
1846 struct lwtunnel_state *lwtstate;
1847
1848 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1849 cfg->fc_encap, AF_INET6, cfg,
1850 &lwtstate);
19e42e45
RP		 1851 if (err)
1852 goto out;
61adedf3
JB		 1853 rt->dst.lwtstate = lwtstate_get(lwtstate);
1854 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1855 rt->dst.lwtstate->orig_output = rt->dst.output;
1856 rt->dst.output = lwtunnel_output;
25368623 1857 }
61adedf3
JB		 1858 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1859 rt->dst.lwtstate->orig_input = rt->dst.input;
1860 rt->dst.input = lwtunnel_input;
25368623 1861 }
19e42e45
RP		 1862 }
1863
86872cb5
TG		 1864 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1865 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1866 if (rt->rt6i_dst.plen == 128)
e5fd387a 1867 rt->dst.flags |= DST_HOST;
e5fd387a 1868
1da177e4 1869#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1870 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1871 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1872#endif
1873
86872cb5 1874 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1875
1876 /* We cannot add true routes via loopback here,
1877 they would result in kernel looping; promote them to reject routes
1878 */
86872cb5 1879 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1880 (dev && (dev->flags & IFF_LOOPBACK) &&
1881 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1882 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1883 /* hold loopback dev/idev if we haven't done so. */
5578689a 1884 if (dev != net->loopback_dev) {
1da177e4
LT		 1885 if (dev) {
1886 dev_put(dev);
1887 in6_dev_put(idev);
1888 }
5578689a 1889 dev = net->loopback_dev;
1da177e4
LT		 1890 dev_hold(dev);
1891 idev = in6_dev_get(dev);
1892 if (!idev) {
1893 err = -ENODEV;
1894 goto out;
1895 }
1896 }
1da177e4 1897 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1898 switch (cfg->fc_type) {
1899 case RTN_BLACKHOLE:
1900 rt->dst.error = -EINVAL;
ede2059d 1901 rt->dst.output = dst_discard_out;
7150aede 1902 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1903 break;
1904 case RTN_PROHIBIT:
1905 rt->dst.error = -EACCES;
7150aede
K		 1906 rt->dst.output = ip6_pkt_prohibit_out;
1907 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1908 break;
b4949ab2 1909 case RTN_THROW:
0315e382 1910 case RTN_UNREACHABLE:
ef2c7d7b 1911 default:
7150aede 1912 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1913 : (cfg->fc_type == RTN_UNREACHABLE)
1914 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1915 rt->dst.output = ip6_pkt_discard_out;
1916 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1917 break;
1918 }
1da177e4
LT		 1919 goto install_route;
1920 }
1921
86872cb5 1922 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1923 const struct in6_addr *gw_addr;
1da177e4
LT		 1924 int gwa_type;
1925
86872cb5 1926 gw_addr = &cfg->fc_gateway;
330567b7 1927 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1928
1929 /* if gw_addr is local we will fail to detect this in case
1930 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1931 * will return already-added prefix route via interface that
1932 * prefix route was assigned to, which might be non-loopback.
1933 */
1934 err = -EINVAL;
330567b7
FW		 1935 if (ipv6_chk_addr_and_flags(net, gw_addr,
1936 gwa_type & IPV6_ADDR_LINKLOCAL ?
1937 dev : NULL, 0, 0))
48ed7b26
FW		 1938 goto out;
1939
4e3fd7a0 1940 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1941
1942 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1943 struct rt6_info *grt;
1944
1945 /* IPv6 strictly inhibits using not link-local
1946 addresses as nexthop address.
1947 Otherwise, router will not able to send redirects.
1948 It is very good, but in some (rare!) circumstances
1949 (SIT, PtP, NBMA NOARP links) it is handy to allow
1950 some exceptions. --ANK
1951 */
38308473 1952 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1953 goto out;
1954
5578689a 1955 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1956
1957 err = -EHOSTUNREACH;
38308473 1958 if (!grt)
1da177e4
LT		 1959 goto out;
1960 if (dev) {
d1918542 1961 if (dev != grt->dst.dev) {
94e187c0 1962 ip6_rt_put(grt);
1da177e4
LT		 1963 goto out;
1964 }
1965 } else {
d1918542 1966 dev = grt->dst.dev;
1da177e4
LT		 1967 idev = grt->rt6i_idev;
1968 dev_hold(dev);
1969 in6_dev_hold(grt->rt6i_idev);
1970 }
38308473 1971 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1972 err = 0;
94e187c0 1973 ip6_rt_put(grt);
1da177e4
LT		 1974
1975 if (err)
1976 goto out;
1977 }
1978 err = -EINVAL;
38308473 1979 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1980 goto out;
1981 }
1982
1983 err = -ENODEV;
38308473 1984 if (!dev)
1da177e4
LT		 1985 goto out;
1986
c3968a85
DW		 1987 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1988 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1989 err = -EINVAL;
1990 goto out;
1991 }
4e3fd7a0 1992 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1993 rt->rt6i_prefsrc.plen = 128;
1994 } else
1995 rt->rt6i_prefsrc.plen = 0;
1996
86872cb5 1997 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1998
1999install_route:
d8d1f30b 2000 rt->dst.dev = dev;
1da177e4 2001 rt->rt6i_idev = idev;
c71099ac 2002 rt->rt6i_table = table;
63152fc0 2003
c346dca1 2004 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2005
8c5b83f0 2006 return rt;
6b9ea5a6
RP		 2007out:
2008 if (dev)
2009 dev_put(dev);
2010 if (idev)
2011 in6_dev_put(idev);
2012 if (rt)
2013 dst_free(&rt->dst);
2014
8c5b83f0 2015 return ERR_PTR(err);
6b9ea5a6
RP		 2016}
2017
2018int ip6_route_add(struct fib6_config *cfg)
2019{
2020 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2021 struct rt6_info *rt;
6b9ea5a6
RP		 2022 int err;
2023
8c5b83f0
RP		 2024 rt = ip6_route_info_create(cfg);
2025 if (IS_ERR(rt)) {
2026 err = PTR_ERR(rt);
2027 rt = NULL;
6b9ea5a6 2028 goto out;
8c5b83f0 2029 }
6b9ea5a6 2030
e715b6d3
FW		 2031 err = ip6_convert_metrics(&mxc, cfg);
2032 if (err)
2033 goto out;
1da177e4 2034
e715b6d3
FW		 2035 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2036
2037 kfree(mxc.mx);
6b9ea5a6 2038
e715b6d3 2039 return err;
1da177e4 2040out:
1da177e4 2041 if (rt)
d8d1f30b 2042 dst_free(&rt->dst);
6b9ea5a6 2043
1da177e4
LT		 2044 return err;
2045}
2046
86872cb5 2047static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2048{
2049 int err;
c71099ac 2050 struct fib6_table *table;
d1918542 2051 struct net *net = dev_net(rt->dst.dev);
1da177e4 2052
8e3d5be7
MKL		 2053 if (rt == net->ipv6.ip6_null_entry ||
2054 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2055 err = -ENOENT;
2056 goto out;
2057 }
6c813a72 2058
c71099ac
TG		 2059 table = rt->rt6i_table;
2060 write_lock_bh(&table->tb6_lock);
86872cb5 2061 err = fib6_del(rt, info);
c71099ac 2062 write_unlock_bh(&table->tb6_lock);
1da177e4 2063
6825a26c 2064out:
94e187c0 2065 ip6_rt_put(rt);
1da177e4
LT		 2066 return err;
2067}
2068
e0a1ad73
TG		 2069int ip6_del_rt(struct rt6_info *rt)
2070{
4d1169c1 2071 struct nl_info info = {
d1918542 2072 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2073 };
528c4ceb 2074 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2075}
2076
86872cb5 2077static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2078{
c71099ac 2079 struct fib6_table *table;
1da177e4
LT		 2080 struct fib6_node *fn;
2081 struct rt6_info *rt;
2082 int err = -ESRCH;
2083
5578689a 2084 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2085 if (!table)
c71099ac
TG		 2086 return err;
2087
2088 read_lock_bh(&table->tb6_lock);
1da177e4 2089
c71099ac 2090 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2091 &cfg->fc_dst, cfg->fc_dst_len,
2092 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2093
1da177e4 2094 if (fn) {
d8d1f30b 2095 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2096 if ((rt->rt6i_flags & RTF_CACHE) &&
2097 !(cfg->fc_flags & RTF_CACHE))
2098 continue;
86872cb5 2099 if (cfg->fc_ifindex &&
d1918542
DM		 2100 (!rt->dst.dev ||
2101 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2102 continue;
86872cb5
TG		 2103 if (cfg->fc_flags & RTF_GATEWAY &&
2104 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2105 continue;
86872cb5 2106 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2107 continue;
d8d1f30b 2108 dst_hold(&rt->dst);
c71099ac 2109 read_unlock_bh(&table->tb6_lock);
1da177e4 2110
86872cb5 2111 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2112 }
2113 }
c71099ac 2114 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2115
2116 return err;
2117}
2118
6700c270 2119static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2120{
a6279458 2121 struct netevent_redirect netevent;
e8599ff4 2122 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2123 struct ndisc_options ndopts;
2124 struct inet6_dev *in6_dev;
2125 struct neighbour *neigh;
71bcdba0 2126 struct rd_msg *msg;
6e157b6a
DM		 2127 int optlen, on_link;
2128 u8 *lladdr;
e8599ff4 2129
29a3cad5 2130 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2131 optlen -= sizeof(*msg);
e8599ff4
DM		 2132
2133 if (optlen < 0) {
6e157b6a 2134 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2135 return;
2136 }
2137
71bcdba0 2138 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2139
71bcdba0 2140 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2141 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2142 return;
2143 }
2144
6e157b6a 2145 on_link = 0;
71bcdba0 2146 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2147 on_link = 1;
71bcdba0 2148 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2149 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2150 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2151 return;
2152 }
2153
2154 in6_dev = __in6_dev_get(skb->dev);
2155 if (!in6_dev)
2156 return;
2157 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2158 return;
2159
2160 /* RFC2461 8.1:
2161 * The IP source address of the Redirect MUST be the same as the current
2162 * first-hop router for the specified ICMP Destination Address.
2163 */
2164
71bcdba0 2165 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2166 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2167 return;
2168 }
6e157b6a
DM		 2169
2170 lladdr = NULL;
e8599ff4
DM		 2171 if (ndopts.nd_opts_tgt_lladdr) {
2172 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2173 skb->dev);
2174 if (!lladdr) {
2175 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2176 return;
2177 }
2178 }
2179
6e157b6a 2180 rt = (struct rt6_info *) dst;
ec13ad1d 2181 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2182 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2183 return;
6e157b6a 2184 }
e8599ff4 2185
6e157b6a
DM		 2186 /* Redirect received -> path was valid.
2187 * Look, redirects are sent only in response to data packets,
2188 * so that this nexthop apparently is reachable. --ANK
2189 */
2190 dst_confirm(&rt->dst);
a6279458 2191
71bcdba0 2192 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2193 if (!neigh)
2194 return;
a6279458 2195
1da177e4
LT		 2196 /*
2197 * We have finally decided to accept it.
2198 */
2199
1ab1457c 2200 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2201 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2202 NEIGH_UPDATE_F_OVERRIDE|
2203 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2204 NEIGH_UPDATE_F_ISROUTER))
2205 );
2206
83a09abd 2207 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2208 if (!nrt)
1da177e4
LT		 2209 goto out;
2210
2211 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2212 if (on_link)
2213 nrt->rt6i_flags &= ~RTF_GATEWAY;
2214
4e3fd7a0 2215 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2216
40e22e8f 2217 if (ip6_ins_rt(nrt))
1da177e4
LT		 2218 goto out;
2219
d8d1f30b
CG		 2220 netevent.old = &rt->dst;
2221 netevent.new = &nrt->dst;
71bcdba0 2222 netevent.daddr = &msg->dest;
60592833 2223 netevent.neigh = neigh;
8d71740c
TT		 2224 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2225
38308473 2226 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2227 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2228 ip6_del_rt(rt);
1da177e4
LT		 2229 }
2230
2231out:
e8599ff4 2232 neigh_release(neigh);
6e157b6a
DM		 2233}
2234
1da177e4
LT		 2235/*
2236 * Misc support functions
2237 */
2238
4b32b5ad
MKL		 2239static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2240{
2241 BUG_ON(from->dst.from);
2242
2243 rt->rt6i_flags &= ~RTF_EXPIRES;
2244 dst_hold(&from->dst);
2245 rt->dst.from = &from->dst;
2246 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2247}
2248
83a09abd
MKL		 2249static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2250{
2251 rt->dst.input = ort->dst.input;
2252 rt->dst.output = ort->dst.output;
2253 rt->rt6i_dst = ort->rt6i_dst;
2254 rt->dst.error = ort->dst.error;
2255 rt->rt6i_idev = ort->rt6i_idev;
2256 if (rt->rt6i_idev)
2257 in6_dev_hold(rt->rt6i_idev);
2258 rt->dst.lastuse = jiffies;
2259 rt->rt6i_gateway = ort->rt6i_gateway;
2260 rt->rt6i_flags = ort->rt6i_flags;
2261 rt6_set_from(rt, ort);
2262 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2263#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2264 rt->rt6i_src = ort->rt6i_src;
1da177e4 2265#endif
83a09abd
MKL		 2266 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2267 rt->rt6i_table = ort->rt6i_table;
61adedf3 2268 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2269}
2270
70ceb4f5 2271#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2272static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2273 const struct in6_addr *prefix, int prefixlen,
2274 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2275{
2276 struct fib6_node *fn;
2277 struct rt6_info *rt = NULL;
c71099ac
TG		 2278 struct fib6_table *table;
2279
efa2cea0 2280 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2281 if (!table)
c71099ac 2282 return NULL;
70ceb4f5 2283
5744dd9b 2284 read_lock_bh(&table->tb6_lock);
67ba4152 2285 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2286 if (!fn)
2287 goto out;
2288
d8d1f30b 2289 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2290 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2291 continue;
2292 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2293 continue;
2294 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2295 continue;
d8d1f30b 2296 dst_hold(&rt->dst);
70ceb4f5
YH		 2297 break;
2298 }
2299out:
5744dd9b 2300 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2301 return rt;
2302}
2303
efa2cea0 2304static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2305 const struct in6_addr *prefix, int prefixlen,
2306 const struct in6_addr *gwaddr, int ifindex,
95c96174 2307 unsigned int pref)
70ceb4f5 2308{
86872cb5 2309 struct fib6_config cfg = {
238fc7ea 2310 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2311 .fc_ifindex = ifindex,
2312 .fc_dst_len = prefixlen,
2313 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2314 RTF_UP | RTF_PREF(pref),
15e47304 2315 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2316 .fc_nlinfo.nlh = NULL,
2317 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2318 };
2319
ca254490 2320 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2321 cfg.fc_dst = *prefix;
2322 cfg.fc_gateway = *gwaddr;
70ceb4f5 2323
e317da96
YH		 2324 /* We should treat it as a default route if prefix length is 0. */
2325 if (!prefixlen)
86872cb5 2326 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2327
86872cb5 2328 ip6_route_add(&cfg);
70ceb4f5 2329
efa2cea0 2330 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2331}
2332#endif
2333
b71d1d42 2334struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2335{
1da177e4 2336 struct rt6_info *rt;
c71099ac 2337 struct fib6_table *table;
1da177e4 2338
c346dca1 2339 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2340 if (!table)
c71099ac 2341 return NULL;
1da177e4 2342
5744dd9b 2343 read_lock_bh(&table->tb6_lock);
67ba4152 2344 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2345 if (dev == rt->dst.dev &&
045927ff 2346 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2347 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2348 break;
2349 }
2350 if (rt)
d8d1f30b 2351 dst_hold(&rt->dst);
5744dd9b 2352 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2353 return rt;
2354}
2355
b71d1d42 2356struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2357 struct net_device *dev,
2358 unsigned int pref)
1da177e4 2359{
86872cb5 2360 struct fib6_config cfg = {
ca254490 2361 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2362 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2363 .fc_ifindex = dev->ifindex,
2364 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2365 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2366 .fc_nlinfo.portid = 0,
5578689a 2367 .fc_nlinfo.nlh = NULL,
c346dca1 2368 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2369 };
1da177e4 2370
4e3fd7a0 2371 cfg.fc_gateway = *gwaddr;
1da177e4 2372
86872cb5 2373 ip6_route_add(&cfg);
1da177e4 2374
1da177e4
LT		 2375 return rt6_get_dflt_router(gwaddr, dev);
2376}
2377
7b4da532 2378void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2379{
2380 struct rt6_info *rt;
c71099ac
TG		 2381 struct fib6_table *table;
2382
2383 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2384 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2385 if (!table)
c71099ac 2386 return;
1da177e4
LT		 2387
2388restart:
c71099ac 2389 read_lock_bh(&table->tb6_lock);
d8d1f30b 2390 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2391 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2392 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2393 dst_hold(&rt->dst);
c71099ac 2394 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2395 ip6_del_rt(rt);
1da177e4
LT		 2396 goto restart;
2397 }
2398 }
c71099ac 2399 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2400}
2401
5578689a
DL		 2402static void rtmsg_to_fib6_config(struct net *net,
2403 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2404 struct fib6_config *cfg)
2405{
2406 memset(cfg, 0, sizeof(*cfg));
2407
ca254490
DA		 2408 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2409 : RT6_TABLE_MAIN;
86872cb5
TG		 2410 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2411 cfg->fc_metric = rtmsg->rtmsg_metric;
2412 cfg->fc_expires = rtmsg->rtmsg_info;
2413 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2414 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2415 cfg->fc_flags = rtmsg->rtmsg_flags;
2416
5578689a 2417 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2418
4e3fd7a0
AD		 2419 cfg->fc_dst = rtmsg->rtmsg_dst;
2420 cfg->fc_src = rtmsg->rtmsg_src;
2421 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2422}
2423
5578689a 2424int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2425{
86872cb5 2426 struct fib6_config cfg;
1da177e4
LT		 2427 struct in6_rtmsg rtmsg;
2428 int err;
2429
67ba4152 2430 switch (cmd) {
1da177e4
LT		 2431 case SIOCADDRT: /* Add a route */
2432 case SIOCDELRT: /* Delete a route */
af31f412 2433 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2434 return -EPERM;
2435 err = copy_from_user(&rtmsg, arg,
2436 sizeof(struct in6_rtmsg));
2437 if (err)
2438 return -EFAULT;
86872cb5 2439
5578689a 2440 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2441
1da177e4
LT		 2442 rtnl_lock();
2443 switch (cmd) {
2444 case SIOCADDRT:
86872cb5 2445 err = ip6_route_add(&cfg);
1da177e4
LT		 2446 break;
2447 case SIOCDELRT:
86872cb5 2448 err = ip6_route_del(&cfg);
1da177e4
LT		 2449 break;
2450 default:
2451 err = -EINVAL;
2452 }
2453 rtnl_unlock();
2454
2455 return err;
3ff50b79 2456 }
1da177e4
LT		 2457
2458 return -EINVAL;
2459}
2460
2461/*
2462 * Drop the packet on the floor
2463 */
2464
d5fdd6ba 2465static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2466{
612f09e8 2467 int type;
adf30907 2468 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2469 switch (ipstats_mib_noroutes) {
2470 case IPSTATS_MIB_INNOROUTES:
0660e03f 2471 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2472 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2473 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2474 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2475 break;
2476 }
2477 /* FALLTHROUGH */
2478 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2479 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2480 ipstats_mib_noroutes);
612f09e8
YH		 2481 break;
2482 }
3ffe533c 2483 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2484 kfree_skb(skb);
2485 return 0;
2486}
2487
9ce8ade0
TG		 2488static int ip6_pkt_discard(struct sk_buff *skb)
2489{
612f09e8 2490 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2491}
2492
ede2059d 2493static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2494{
adf30907 2495 skb->dev = skb_dst(skb)->dev;
612f09e8 2496 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2497}
2498
9ce8ade0
TG		 2499static int ip6_pkt_prohibit(struct sk_buff *skb)
2500{
612f09e8 2501 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2502}
2503
ede2059d 2504static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2505{
adf30907 2506 skb->dev = skb_dst(skb)->dev;
612f09e8 2507 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2508}
2509
1da177e4
LT		 2510/*
2511 * Allocate a dst for local (unicast / anycast) address.
2512 */
2513
2514struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2515 const struct in6_addr *addr,
8f031519 2516 bool anycast)
1da177e4 2517{
ca254490 2518 u32 tb_id;
c346dca1 2519 struct net *net = dev_net(idev->dev);
a3300ef4 2520 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2521 DST_NOCOUNT);
a3300ef4 2522 if (!rt)
1da177e4
LT		 2523 return ERR_PTR(-ENOMEM);
2524
1da177e4
LT		 2525 in6_dev_hold(idev);
2526
11d53b49 2527 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2528 rt->dst.input = ip6_input;
2529 rt->dst.output = ip6_output;
1da177e4 2530 rt->rt6i_idev = idev;
1da177e4
LT		 2531
2532 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2533 if (anycast)
2534 rt->rt6i_flags |= RTF_ANYCAST;
2535 else
1da177e4 2536 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2537
550bab42 2538 rt->rt6i_gateway = *addr;
4e3fd7a0 2539 rt->rt6i_dst.addr = *addr;
1da177e4 2540 rt->rt6i_dst.plen = 128;
ca254490
DA		 2541 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2542 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2543 rt->dst.flags |= DST_NOCACHE;
1da177e4 2544
d8d1f30b 2545 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2546
2547 return rt;
2548}
2549
c3968a85
DW		 2550int ip6_route_get_saddr(struct net *net,
2551 struct rt6_info *rt,
b71d1d42 2552 const struct in6_addr *daddr,
c3968a85
DW		 2553 unsigned int prefs,
2554 struct in6_addr *saddr)
2555{
e16e888b
MS		 2556 struct inet6_dev *idev =
2557 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2558 int err = 0;
e16e888b 2559 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2560 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2561 else
2562 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2563 daddr, prefs, saddr);
2564 return err;
2565}
2566
2567/* remove deleted ip from prefsrc entries */
2568struct arg_dev_net_ip {
2569 struct net_device *dev;
2570 struct net *net;
2571 struct in6_addr *addr;
2572};
2573
2574static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2575{
2576 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2577 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2578 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2579
d1918542 2580 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2581 rt != net->ipv6.ip6_null_entry &&
2582 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2583 /* remove prefsrc entry */
2584 rt->rt6i_prefsrc.plen = 0;
2585 }
2586 return 0;
2587}
2588
2589void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2590{
2591 struct net *net = dev_net(ifp->idev->dev);
2592 struct arg_dev_net_ip adni = {
2593 .dev = ifp->idev->dev,
2594 .net = net,
2595 .addr = &ifp->addr,
2596 };
0c3584d5 2597 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2598}
2599
be7a010d
DJ		 2600#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2601#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2602
2603/* Remove routers and update dst entries when gateway turn into host. */
2604static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2605{
2606 struct in6_addr *gateway = (struct in6_addr *)arg;
2607
2608 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2609 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2610 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2611 return -1;
2612 }
2613 return 0;
2614}
2615
2616void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2617{
2618 fib6_clean_all(net, fib6_clean_tohost, gateway);
2619}
2620
8ed67789
DL		 2621struct arg_dev_net {
2622 struct net_device *dev;
2623 struct net *net;
2624};
2625
1da177e4
LT		 2626static int fib6_ifdown(struct rt6_info *rt, void *arg)
2627{
bc3ef660 2628 const struct arg_dev_net *adn = arg;
2629 const struct net_device *dev = adn->dev;
8ed67789 2630
d1918542 2631 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2632 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2633 return -1;
c159d30c 2634
1da177e4
LT		 2635 return 0;
2636}
2637
f3db4851 2638void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2639{
8ed67789
DL		 2640 struct arg_dev_net adn = {
2641 .dev = dev,
2642 .net = net,
2643 };
2644
0c3584d5 2645 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2646 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2647 if (dev)
2648 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2649}
2650
95c96174 2651struct rt6_mtu_change_arg {
1da177e4 2652 struct net_device *dev;
95c96174 2653 unsigned int mtu;
1da177e4
LT		 2654};
2655
2656static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2657{
2658 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2659 struct inet6_dev *idev;
2660
2661 /* In IPv6 pmtu discovery is not optional,
2662 so that RTAX_MTU lock cannot disable it.
2663 We still use this lock to block changes
2664 caused by addrconf/ndisc.
2665 */
2666
2667 idev = __in6_dev_get(arg->dev);
38308473 2668 if (!idev)
1da177e4
LT		 2669 return 0;
2670
2671 /* For administrative MTU increase, there is no way to discover
2672 IPv6 PMTU increase, so PMTU increase should be updated here.
2673 Since RFC 1981 doesn't include administrative MTU increase
2674 update PMTU increase is a MUST. (i.e. jumbo frame)
2675 */
2676 /*
2677 If new MTU is less than route PMTU, this new MTU will be the
2678 lowest MTU in the path, update the route PMTU to reflect PMTU
2679 decreases; if new MTU is greater than route PMTU, and the
2680 old MTU is the lowest MTU in the path, update the route PMTU
2681 to reflect the increase. In this case if the other nodes' MTU
2682 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2683 PMTU discouvery.
2684 */
d1918542 2685 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2686 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2687 if (rt->rt6i_flags & RTF_CACHE) {
2688 /* For RTF_CACHE with rt6i_pmtu == 0
2689 * (i.e. a redirected route),
2690 * the metrics of its rt->dst.from has already
2691 * been updated.
2692 */
2693 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2694 rt->rt6i_pmtu = arg->mtu;
2695 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2696 (dst_mtu(&rt->dst) < arg->mtu &&
2697 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2698 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2699 }
566cfd8f 2700 }
1da177e4
LT		 2701 return 0;
2702}
2703
95c96174 2704void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2705{
c71099ac
TG		 2706 struct rt6_mtu_change_arg arg = {
2707 .dev = dev,
2708 .mtu = mtu,
2709 };
1da177e4 2710
0c3584d5 2711 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2712}
2713
ef7c79ed 2714static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2715 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2716 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2717 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2718 [RTA_PRIORITY] = { .type = NLA_U32 },
2719 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2720 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2721 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2722 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2723 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2724 [RTA_EXPIRES] = { .type = NLA_U32 },
86872cb5
TG		 2725};
2726
2727static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2728 struct fib6_config *cfg)
1da177e4 2729{
86872cb5
TG		 2730 struct rtmsg *rtm;
2731 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2732 unsigned int pref;
86872cb5 2733 int err;
1da177e4 2734
86872cb5
TG		 2735 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2736 if (err < 0)
2737 goto errout;
1da177e4 2738
86872cb5
TG		 2739 err = -EINVAL;
2740 rtm = nlmsg_data(nlh);
2741 memset(cfg, 0, sizeof(*cfg));
2742
2743 cfg->fc_table = rtm->rtm_table;
2744 cfg->fc_dst_len = rtm->rtm_dst_len;
2745 cfg->fc_src_len = rtm->rtm_src_len;
2746 cfg->fc_flags = RTF_UP;
2747 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2748 cfg->fc_type = rtm->rtm_type;
86872cb5 2749
ef2c7d7b
ND		 2750 if (rtm->rtm_type == RTN_UNREACHABLE ||
2751 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2752 rtm->rtm_type == RTN_PROHIBIT ||
2753 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2754 cfg->fc_flags |= RTF_REJECT;
2755
ab79ad14
MŻ		 2756 if (rtm->rtm_type == RTN_LOCAL)
2757 cfg->fc_flags |= RTF_LOCAL;
2758
1f56a01f
MKL		 2759 if (rtm->rtm_flags & RTM_F_CLONED)
2760 cfg->fc_flags |= RTF_CACHE;
2761
15e47304 2762 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2763 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2764 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2765
2766 if (tb[RTA_GATEWAY]) {
67b61f6c 2767 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2768 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2769 }
86872cb5
TG		 2770
2771 if (tb[RTA_DST]) {
2772 int plen = (rtm->rtm_dst_len + 7) >> 3;
2773
2774 if (nla_len(tb[RTA_DST]) < plen)
2775 goto errout;
2776
2777 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2778 }
86872cb5
TG		 2779
2780 if (tb[RTA_SRC]) {
2781 int plen = (rtm->rtm_src_len + 7) >> 3;
2782
2783 if (nla_len(tb[RTA_SRC]) < plen)
2784 goto errout;
2785
2786 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2787 }
86872cb5 2788
c3968a85 2789 if (tb[RTA_PREFSRC])
67b61f6c 2790 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2791
86872cb5
TG		 2792 if (tb[RTA_OIF])
2793 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2794
2795 if (tb[RTA_PRIORITY])
2796 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2797
2798 if (tb[RTA_METRICS]) {
2799 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2800 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2801 }
86872cb5
TG		 2802
2803 if (tb[RTA_TABLE])
2804 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2805
51ebd318
ND		 2806 if (tb[RTA_MULTIPATH]) {
2807 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2808 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2809 }
2810
c78ba6d6
LR		 2811 if (tb[RTA_PREF]) {
2812 pref = nla_get_u8(tb[RTA_PREF]);
2813 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2814 pref != ICMPV6_ROUTER_PREF_HIGH)
2815 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2816 cfg->fc_flags |= RTF_PREF(pref);
2817 }
2818
19e42e45
RP		 2819 if (tb[RTA_ENCAP])
2820 cfg->fc_encap = tb[RTA_ENCAP];
2821
2822 if (tb[RTA_ENCAP_TYPE])
2823 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2824
32bc201e
XL		 2825 if (tb[RTA_EXPIRES]) {
2826 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2827
2828 if (addrconf_finite_timeout(timeout)) {
2829 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2830 cfg->fc_flags |= RTF_EXPIRES;
2831 }
2832 }
2833
86872cb5
TG		 2834 err = 0;
2835errout:
2836 return err;
1da177e4
LT		 2837}
2838
6b9ea5a6
RP		 2839struct rt6_nh {
2840 struct rt6_info *rt6_info;
2841 struct fib6_config r_cfg;
2842 struct mx6_config mxc;
2843 struct list_head next;
2844};
2845
2846static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2847{
2848 struct rt6_nh *nh;
2849
2850 list_for_each_entry(nh, rt6_nh_list, next) {
2851 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2852 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2853 nh->r_cfg.fc_ifindex);
2854 }
2855}
2856
2857static int ip6_route_info_append(struct list_head *rt6_nh_list,
2858 struct rt6_info *rt, struct fib6_config *r_cfg)
2859{
2860 struct rt6_nh *nh;
2861 struct rt6_info *rtnh;
2862 int err = -EEXIST;
2863
2864 list_for_each_entry(nh, rt6_nh_list, next) {
2865 /* check if rt6_info already exists */
2866 rtnh = nh->rt6_info;
2867
2868 if (rtnh->dst.dev == rt->dst.dev &&
2869 rtnh->rt6i_idev == rt->rt6i_idev &&
2870 ipv6_addr_equal(&rtnh->rt6i_gateway,
2871 &rt->rt6i_gateway))
2872 return err;
2873 }
2874
2875 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2876 if (!nh)
2877 return -ENOMEM;
2878 nh->rt6_info = rt;
2879 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2880 if (err) {
2881 kfree(nh);
2882 return err;
2883 }
2884 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2885 list_add_tail(&nh->next, rt6_nh_list);
2886
2887 return 0;
2888}
2889
2890static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2891{
2892 struct fib6_config r_cfg;
2893 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2894 struct rt6_info *rt;
2895 struct rt6_nh *err_nh;
2896 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2897 int remaining;
2898 int attrlen;
6b9ea5a6
RP		 2899 int err = 1;
2900 int nhn = 0;
2901 int replace = (cfg->fc_nlinfo.nlh &&
2902 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2903 LIST_HEAD(rt6_nh_list);
51ebd318 2904
35f1b4e9 2905 remaining = cfg->fc_mp_len;
51ebd318 2906 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2907
6b9ea5a6
RP		 2908 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2909 * rt6_info structs per nexthop
2910 */
51ebd318
ND		 2911 while (rtnh_ok(rtnh, remaining)) {
2912 memcpy(&r_cfg, cfg, sizeof(*cfg));
2913 if (rtnh->rtnh_ifindex)
2914 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2915
2916 attrlen = rtnh_attrlen(rtnh);
2917 if (attrlen > 0) {
2918 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2919
2920 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2921 if (nla) {
67b61f6c 2922 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2923 r_cfg.fc_flags |= RTF_GATEWAY;
2924 }
19e42e45
RP		 2925 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2926 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2927 if (nla)
2928 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2929 }
6b9ea5a6 2930
8c5b83f0
RP		 2931 rt = ip6_route_info_create(&r_cfg);
2932 if (IS_ERR(rt)) {
2933 err = PTR_ERR(rt);
2934 rt = NULL;
6b9ea5a6 2935 goto cleanup;
8c5b83f0 2936 }
6b9ea5a6
RP		 2937
2938 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2939 if (err) {
6b9ea5a6
RP		 2940 dst_free(&rt->dst);
2941 goto cleanup;
2942 }
2943
2944 rtnh = rtnh_next(rtnh, &remaining);
2945 }
2946
2947 err_nh = NULL;
2948 list_for_each_entry(nh, &rt6_nh_list, next) {
2949 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2950 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2951 nh->rt6_info = NULL;
2952 if (err) {
2953 if (replace && nhn)
2954 ip6_print_replace_route_err(&rt6_nh_list);
2955 err_nh = nh;
2956 goto add_errout;
51ebd318 2957 }
6b9ea5a6 2958
1a72418b 2959 /* Because each route is added like a single route we remove
27596472
MK		 2960 * these flags after the first nexthop: if there is a collision,
2961 * we have already failed to add the first nexthop:
2962 * fib6_add_rt2node() has rejected it; when replacing, old
2963 * nexthops have been replaced by first new, the rest should
2964 * be added to it.
1a72418b 2965 */
27596472
MK		 2966 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2967 NLM_F_REPLACE);
6b9ea5a6
RP		 2968 nhn++;
2969 }
2970
2971 goto cleanup;
2972
2973add_errout:
2974 /* Delete routes that were already added */
2975 list_for_each_entry(nh, &rt6_nh_list, next) {
2976 if (err_nh == nh)
2977 break;
2978 ip6_route_del(&nh->r_cfg);
2979 }
2980
2981cleanup:
2982 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2983 if (nh->rt6_info)
2984 dst_free(&nh->rt6_info->dst);
52fe51f8 2985 kfree(nh->mxc.mx);
6b9ea5a6
RP		 2986 list_del(&nh->next);
2987 kfree(nh);
2988 }
2989
2990 return err;
2991}
2992
2993static int ip6_route_multipath_del(struct fib6_config *cfg)
2994{
2995 struct fib6_config r_cfg;
2996 struct rtnexthop *rtnh;
2997 int remaining;
2998 int attrlen;
2999 int err = 1, last_err = 0;
3000
3001 remaining = cfg->fc_mp_len;
3002 rtnh = (struct rtnexthop *)cfg->fc_mp;
3003
3004 /* Parse a Multipath Entry */
3005 while (rtnh_ok(rtnh, remaining)) {
3006 memcpy(&r_cfg, cfg, sizeof(*cfg));
3007 if (rtnh->rtnh_ifindex)
3008 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3009
3010 attrlen = rtnh_attrlen(rtnh);
3011 if (attrlen > 0) {
3012 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3013
3014 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3015 if (nla) {
3016 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3017 r_cfg.fc_flags |= RTF_GATEWAY;
3018 }
3019 }
3020 err = ip6_route_del(&r_cfg);
3021 if (err)
3022 last_err = err;
3023
51ebd318
ND		 3024 rtnh = rtnh_next(rtnh, &remaining);
3025 }
3026
3027 return last_err;
3028}
3029
67ba4152 3030static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3031{
86872cb5
TG		 3032 struct fib6_config cfg;
3033 int err;
1da177e4 3034
86872cb5
TG		 3035 err = rtm_to_fib6_config(skb, nlh, &cfg);
3036 if (err < 0)
3037 return err;
3038
51ebd318 3039 if (cfg.fc_mp)
6b9ea5a6 3040 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3041 else
3042 return ip6_route_del(&cfg);
1da177e4
LT		 3043}
3044
67ba4152 3045static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3046{
86872cb5
TG		 3047 struct fib6_config cfg;
3048 int err;
1da177e4 3049
86872cb5
TG		 3050 err = rtm_to_fib6_config(skb, nlh, &cfg);
3051 if (err < 0)
3052 return err;
3053
51ebd318 3054 if (cfg.fc_mp)
6b9ea5a6 3055 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3056 else
3057 return ip6_route_add(&cfg);
1da177e4
LT		 3058}
3059
19e42e45 3060static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3061{
3062 return NLMSG_ALIGN(sizeof(struct rtmsg))
3063 + nla_total_size(16) /* RTA_SRC */
3064 + nla_total_size(16) /* RTA_DST */
3065 + nla_total_size(16) /* RTA_GATEWAY */
3066 + nla_total_size(16) /* RTA_PREFSRC */
3067 + nla_total_size(4) /* RTA_TABLE */
3068 + nla_total_size(4) /* RTA_IIF */
3069 + nla_total_size(4) /* RTA_OIF */
3070 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3071 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3072 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3073 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3074 + nla_total_size(1) /* RTA_PREF */
61adedf3 3075 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3076}
3077
191cd582
BH		 3078static int rt6_fill_node(struct net *net,
3079 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3080 struct in6_addr *dst, struct in6_addr *src,
15e47304 3081 int iif, int type, u32 portid, u32 seq,
7bc570c8 3082 int prefix, int nowait, unsigned int flags)
1da177e4 3083{
4b32b5ad 3084 u32 metrics[RTAX_MAX];
1da177e4 3085 struct rtmsg *rtm;
2d7202bf 3086 struct nlmsghdr *nlh;
e3703b3d 3087 long expires;
9e762a4a 3088 u32 table;
1da177e4
LT		 3089
3090 if (prefix) { /* user wants prefix routes only */
3091 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3092 /* success since this is not a prefix route */
3093 return 1;
3094 }
3095 }
3096
15e47304 3097 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3098 if (!nlh)
26932566 3099 return -EMSGSIZE;
2d7202bf
TG		 3100
3101 rtm = nlmsg_data(nlh);
1da177e4
LT		 3102 rtm->rtm_family = AF_INET6;
3103 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3104 rtm->rtm_src_len = rt->rt6i_src.plen;
3105 rtm->rtm_tos = 0;
c71099ac 3106 if (rt->rt6i_table)
9e762a4a 3107 table = rt->rt6i_table->tb6_id;
c71099ac 3108 else
9e762a4a
PM		 3109 table = RT6_TABLE_UNSPEC;
3110 rtm->rtm_table = table;
c78679e8
DM		 3111 if (nla_put_u32(skb, RTA_TABLE, table))
3112 goto nla_put_failure;
ef2c7d7b
ND		 3113 if (rt->rt6i_flags & RTF_REJECT) {
3114 switch (rt->dst.error) {
3115 case -EINVAL:
3116 rtm->rtm_type = RTN_BLACKHOLE;
3117 break;
3118 case -EACCES:
3119 rtm->rtm_type = RTN_PROHIBIT;
3120 break;
b4949ab2
ND		 3121 case -EAGAIN:
3122 rtm->rtm_type = RTN_THROW;
3123 break;
ef2c7d7b
ND		 3124 default:
3125 rtm->rtm_type = RTN_UNREACHABLE;
3126 break;
3127 }
3128 }
38308473 3129 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3130 rtm->rtm_type = RTN_LOCAL;
d1918542 3131 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3132 rtm->rtm_type = RTN_LOCAL;
3133 else
3134 rtm->rtm_type = RTN_UNICAST;
3135 rtm->rtm_flags = 0;
35103d11 3136 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3137 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3138 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3139 rtm->rtm_flags |= RTNH_F_DEAD;
3140 }
1da177e4
LT		 3141 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3142 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3143 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3144 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3145 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3146 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3147 rtm->rtm_protocol = RTPROT_RA;
3148 else
3149 rtm->rtm_protocol = RTPROT_KERNEL;
3150 }
1da177e4 3151
38308473 3152 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3153 rtm->rtm_flags |= RTM_F_CLONED;
3154
3155 if (dst) {
930345ea 3156 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3157 goto nla_put_failure;
1ab1457c 3158 rtm->rtm_dst_len = 128;
1da177e4 3159 } else if (rtm->rtm_dst_len)
930345ea 3160 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3161 goto nla_put_failure;
1da177e4
LT		 3162#ifdef CONFIG_IPV6_SUBTREES
3163 if (src) {
930345ea 3164 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3165 goto nla_put_failure;
1ab1457c 3166 rtm->rtm_src_len = 128;
c78679e8 3167 } else if (rtm->rtm_src_len &&
930345ea 3168 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3169 goto nla_put_failure;
1da177e4 3170#endif
7bc570c8
YH		 3171 if (iif) {
3172#ifdef CONFIG_IPV6_MROUTE
3173 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3174 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3175 if (err <= 0) {
3176 if (!nowait) {
3177 if (err == 0)
3178 return 0;
3179 goto nla_put_failure;
3180 } else {
3181 if (err == -EMSGSIZE)
3182 goto nla_put_failure;
3183 }
3184 }
3185 } else
3186#endif
c78679e8
DM		 3187 if (nla_put_u32(skb, RTA_IIF, iif))
3188 goto nla_put_failure;
7bc570c8 3189 } else if (dst) {
1da177e4 3190 struct in6_addr saddr_buf;
c78679e8 3191 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3192 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3193 goto nla_put_failure;
1da177e4 3194 }
2d7202bf 3195
c3968a85
DW		 3196 if (rt->rt6i_prefsrc.plen) {
3197 struct in6_addr saddr_buf;
4e3fd7a0 3198 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3199 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3200 goto nla_put_failure;
c3968a85
DW		 3201 }
3202
4b32b5ad
MKL		 3203 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3204 if (rt->rt6i_pmtu)
3205 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3206 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3207 goto nla_put_failure;
3208
dd0cbf29 3209 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3210 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3211 goto nla_put_failure;
94f826b8 3212 }
2d7202bf 3213
c78679e8
DM		 3214 if (rt->dst.dev &&
3215 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3216 goto nla_put_failure;
3217 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3218 goto nla_put_failure;
8253947e
LW		 3219
3220 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3221
87a50699 3222 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3223 goto nla_put_failure;
2d7202bf 3224
c78ba6d6
LR		 3225 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3226 goto nla_put_failure;
3227
61adedf3 3228 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3229
053c095a
JB		 3230 nlmsg_end(skb, nlh);
3231 return 0;
2d7202bf
TG		 3232
3233nla_put_failure:
26932566
PM		 3234 nlmsg_cancel(skb, nlh);
3235 return -EMSGSIZE;
1da177e4
LT		 3236}
3237
1b43af54 3238int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3239{
3240 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3241 int prefix;
3242
2d7202bf
TG		 3243 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3244 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3245 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3246 } else
3247 prefix = 0;
3248
191cd582
BH		 3249 return rt6_fill_node(arg->net,
3250 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3251 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3252 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3253}
3254
67ba4152 3255static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3256{
3b1e0a65 3257 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3258 struct nlattr *tb[RTA_MAX+1];
3259 struct rt6_info *rt;
1da177e4 3260 struct sk_buff *skb;
ab364a6f 3261 struct rtmsg *rtm;
4c9483b2 3262 struct flowi6 fl6;
72331bc0 3263 int err, iif = 0, oif = 0;
1da177e4 3264
ab364a6f
TG		 3265 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3266 if (err < 0)
3267 goto errout;
1da177e4 3268
ab364a6f 3269 err = -EINVAL;
4c9483b2 3270 memset(&fl6, 0, sizeof(fl6));
1da177e4 3271
ab364a6f
TG		 3272 if (tb[RTA_SRC]) {
3273 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3274 goto errout;
3275
4e3fd7a0 3276 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3277 }
3278
3279 if (tb[RTA_DST]) {
3280 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3281 goto errout;
3282
4e3fd7a0 3283 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3284 }
3285
3286 if (tb[RTA_IIF])
3287 iif = nla_get_u32(tb[RTA_IIF]);
3288
3289 if (tb[RTA_OIF])
72331bc0 3290 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3291
2e47b291
LC		 3292 if (tb[RTA_MARK])
3293 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3294
1da177e4
LT		 3295 if (iif) {
3296 struct net_device *dev;
72331bc0
SL		 3297 int flags = 0;
3298
5578689a 3299 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3300 if (!dev) {
3301 err = -ENODEV;
ab364a6f 3302 goto errout;
1da177e4 3303 }
72331bc0
SL		 3304
3305 fl6.flowi6_iif = iif;
3306
3307 if (!ipv6_addr_any(&fl6.saddr))
3308 flags |= RT6_LOOKUP_F_HAS_SADDR;
3309
3310 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3311 flags);
3312 } else {
3313 fl6.flowi6_oif = oif;
3314
ca254490
DA		 3315 if (netif_index_is_l3_master(net, oif)) {
3316 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3317 FLOWI_FLAG_SKIP_NH_OIF;
3318 }
3319
72331bc0 3320 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3321 }
3322
ab364a6f 3323 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3324 if (!skb) {
94e187c0 3325 ip6_rt_put(rt);
ab364a6f
TG		 3326 err = -ENOBUFS;
3327 goto errout;
3328 }
1da177e4 3329
ab364a6f
TG		 3330 /* Reserve room for dummy headers, this skb can pass
3331 through good chunk of routing engine.
3332 */
459a98ed 3333 skb_reset_mac_header(skb);
ab364a6f 3334 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3335
d8d1f30b 3336 skb_dst_set(skb, &rt->dst);
1da177e4 3337
4c9483b2 3338 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3339 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3340 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3341 if (err < 0) {
ab364a6f
TG		 3342 kfree_skb(skb);
3343 goto errout;
1da177e4
LT		 3344 }
3345
15e47304 3346 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3347errout:
1da177e4 3348 return err;
1da177e4
LT		 3349}
3350
37a1d361
RP		 3351void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3352 unsigned int nlm_flags)
1da177e4
LT		 3353{
3354 struct sk_buff *skb;
5578689a 3355 struct net *net = info->nl_net;
528c4ceb
DL		 3356 u32 seq;
3357 int err;
3358
3359 err = -ENOBUFS;
38308473 3360 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3361
19e42e45 3362 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3363 if (!skb)
21713ebc
TG		 3364 goto errout;
3365
191cd582 3366 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3367 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3368 if (err < 0) {
3369 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3370 WARN_ON(err == -EMSGSIZE);
3371 kfree_skb(skb);
3372 goto errout;
3373 }
15e47304 3374 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3375 info->nlh, gfp_any());
3376 return;
21713ebc
TG		 3377errout:
3378 if (err < 0)
5578689a 3379 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3380}
3381
8ed67789 3382static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3383 unsigned long event, void *ptr)
8ed67789 3384{
351638e7 3385 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3386 struct net *net = dev_net(dev);
8ed67789
DL		 3387
3388 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3389 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3390 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3391#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3392 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3393 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3394 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3395 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3396#endif
3397 }
3398
3399 return NOTIFY_OK;
3400}
3401
1da177e4
LT		 3402/*
3403 * /proc
3404 */
3405
3406#ifdef CONFIG_PROC_FS
3407
33120b30
AD		 3408static const struct file_operations ipv6_route_proc_fops = {
3409 .owner = THIS_MODULE,
3410 .open = ipv6_route_open,
3411 .read = seq_read,
3412 .llseek = seq_lseek,
8d2ca1d7 3413 .release = seq_release_net,
33120b30
AD		 3414};
3415
1da177e4
LT		 3416static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3417{
69ddb805 3418 struct net *net = (struct net *)seq->private;
1da177e4 3419 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3420 net->ipv6.rt6_stats->fib_nodes,
3421 net->ipv6.rt6_stats->fib_route_nodes,
3422 net->ipv6.rt6_stats->fib_rt_alloc,
3423 net->ipv6.rt6_stats->fib_rt_entries,
3424 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3425 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3426 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3427
3428 return 0;
3429}
3430
3431static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3432{
de05c557 3433 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3434}
3435
9a32144e 3436static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3437 .owner = THIS_MODULE,
3438 .open = rt6_stats_seq_open,
3439 .read = seq_read,
3440 .llseek = seq_lseek,
b6fcbdb4 3441 .release = single_release_net,
1da177e4
LT		 3442};
3443#endif /* CONFIG_PROC_FS */
3444
3445#ifdef CONFIG_SYSCTL
3446
1da177e4 3447static
fe2c6338 3448int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3449 void __user *buffer, size_t *lenp, loff_t *ppos)
3450{
c486da34
LAG		 3451 struct net *net;
3452 int delay;
3453 if (!write)
1da177e4 3454 return -EINVAL;
c486da34
LAG		 3455
3456 net = (struct net *)ctl->extra1;
3457 delay = net->ipv6.sysctl.flush_delay;
3458 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3459 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3460 return 0;
1da177e4
LT		 3461}
3462
fe2c6338 3463struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3464 {
1da177e4 3465 .procname = "flush",
4990509f 3466 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3467 .maxlen = sizeof(int),
89c8b3a1 3468 .mode = 0200,
6d9f239a 3469 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3470 },
3471 {
1da177e4 3472 .procname = "gc_thresh",
9a7ec3a9 3473 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3474 .maxlen = sizeof(int),
3475 .mode = 0644,
6d9f239a 3476 .proc_handler = proc_dointvec,
1da177e4
LT		 3477 },
3478 {
1da177e4 3479 .procname = "max_size",
4990509f 3480 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3481 .maxlen = sizeof(int),
3482 .mode = 0644,
6d9f239a 3483 .proc_handler = proc_dointvec,
1da177e4
LT		 3484 },
3485 {
1da177e4 3486 .procname = "gc_min_interval",
4990509f 3487 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3488 .maxlen = sizeof(int),
3489 .mode = 0644,
6d9f239a 3490 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3491 },
3492 {
1da177e4 3493 .procname = "gc_timeout",
4990509f 3494 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3495 .maxlen = sizeof(int),
3496 .mode = 0644,
6d9f239a 3497 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3498 },
3499 {
1da177e4 3500 .procname = "gc_interval",
4990509f 3501 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3502 .maxlen = sizeof(int),
3503 .mode = 0644,
6d9f239a 3504 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3505 },
3506 {
1da177e4 3507 .procname = "gc_elasticity",
4990509f 3508 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3509 .maxlen = sizeof(int),
3510 .mode = 0644,
f3d3f616 3511 .proc_handler = proc_dointvec,
1da177e4
LT		 3512 },
3513 {
1da177e4 3514 .procname = "mtu_expires",
4990509f 3515 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3516 .maxlen = sizeof(int),
3517 .mode = 0644,
6d9f239a 3518 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3519 },
3520 {
1da177e4 3521 .procname = "min_adv_mss",
4990509f 3522 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3523 .maxlen = sizeof(int),
3524 .mode = 0644,
f3d3f616 3525 .proc_handler = proc_dointvec,
1da177e4
LT		 3526 },
3527 {
1da177e4 3528 .procname = "gc_min_interval_ms",
4990509f 3529 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3530 .maxlen = sizeof(int),
3531 .mode = 0644,
6d9f239a 3532 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3533 },
f8572d8f 3534 { }
1da177e4
LT		 3535};
3536
2c8c1e72 3537struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3538{
3539 struct ctl_table *table;
3540
3541 table = kmemdup(ipv6_route_table_template,
3542 sizeof(ipv6_route_table_template),
3543 GFP_KERNEL);
5ee09105
YH		 3544
3545 if (table) {
3546 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3547 table[0].extra1 = net;
86393e52 3548 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3549 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3550 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3551 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3552 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3553 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3554 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3555 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3556 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3557
3558 /* Don't export sysctls to unprivileged users */
3559 if (net->user_ns != &init_user_ns)
3560 table[0].procname = NULL;
5ee09105
YH		 3561 }
3562
760f2d01
DL		 3563 return table;
3564}
1da177e4
LT		 3565#endif
3566
2c8c1e72 3567static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3568{
633d424b 3569 int ret = -ENOMEM;
8ed67789 3570
86393e52
AD		 3571 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3572 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3573
fc66f95c
ED		 3574 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3575 goto out_ip6_dst_ops;
3576
8ed67789
DL		 3577 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3578 sizeof(*net->ipv6.ip6_null_entry),
3579 GFP_KERNEL);
3580 if (!net->ipv6.ip6_null_entry)
fc66f95c 3581 goto out_ip6_dst_entries;
d8d1f30b 3582 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3583 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3584 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3585 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3586 ip6_template_metrics, true);
8ed67789
DL		 3587
3588#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3589 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3590 sizeof(*net->ipv6.ip6_prohibit_entry),
3591 GFP_KERNEL);
68fffc67
PZ		 3592 if (!net->ipv6.ip6_prohibit_entry)
3593 goto out_ip6_null_entry;
d8d1f30b 3594 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3595 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3596 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3597 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3598 ip6_template_metrics, true);
8ed67789
DL		 3599
3600 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3601 sizeof(*net->ipv6.ip6_blk_hole_entry),
3602 GFP_KERNEL);
68fffc67
PZ		 3603 if (!net->ipv6.ip6_blk_hole_entry)
3604 goto out_ip6_prohibit_entry;
d8d1f30b 3605 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3606 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3607 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3608 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3609 ip6_template_metrics, true);
8ed67789
DL		 3610#endif
3611
b339a47c
PZ		 3612 net->ipv6.sysctl.flush_delay = 0;
3613 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3614 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3615 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3616 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3617 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3618 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3619 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3620
6891a346
BT		 3621 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3622
8ed67789
DL		 3623 ret = 0;
3624out:
3625 return ret;
f2fc6a54 3626
68fffc67
PZ		 3627#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3628out_ip6_prohibit_entry:
3629 kfree(net->ipv6.ip6_prohibit_entry);
3630out_ip6_null_entry:
3631 kfree(net->ipv6.ip6_null_entry);
3632#endif
fc66f95c
ED		 3633out_ip6_dst_entries:
3634 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3635out_ip6_dst_ops:
f2fc6a54 3636 goto out;
cdb18761
DL		 3637}
3638
2c8c1e72 3639static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3640{
8ed67789
DL		 3641 kfree(net->ipv6.ip6_null_entry);
3642#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3643 kfree(net->ipv6.ip6_prohibit_entry);
3644 kfree(net->ipv6.ip6_blk_hole_entry);
3645#endif
41bb78b4 3646 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3647}
3648
d189634e
TG		 3649static int __net_init ip6_route_net_init_late(struct net *net)
3650{
3651#ifdef CONFIG_PROC_FS
d4beaa66
G		 3652 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3653 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3654#endif
3655 return 0;
3656}
3657
3658static void __net_exit ip6_route_net_exit_late(struct net *net)
3659{
3660#ifdef CONFIG_PROC_FS
ece31ffd
G		 3661 remove_proc_entry("ipv6_route", net->proc_net);
3662 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3663#endif
3664}
3665
cdb18761
DL		 3666static struct pernet_operations ip6_route_net_ops = {
3667 .init = ip6_route_net_init,
3668 .exit = ip6_route_net_exit,
3669};
3670
c3426b47
DM		 3671static int __net_init ipv6_inetpeer_init(struct net *net)
3672{
3673 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3674
3675 if (!bp)
3676 return -ENOMEM;
3677 inet_peer_base_init(bp);
3678 net->ipv6.peers = bp;
3679 return 0;
3680}
3681
3682static void __net_exit ipv6_inetpeer_exit(struct net *net)
3683{
3684 struct inet_peer_base *bp = net->ipv6.peers;
3685
3686 net->ipv6.peers = NULL;
56a6b248 3687 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3688 kfree(bp);
3689}
3690
2b823f72 3691static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3692 .init = ipv6_inetpeer_init,
3693 .exit = ipv6_inetpeer_exit,
3694};
3695
d189634e
TG		 3696static struct pernet_operations ip6_route_net_late_ops = {
3697 .init = ip6_route_net_init_late,
3698 .exit = ip6_route_net_exit_late,
3699};
3700
8ed67789
DL		 3701static struct notifier_block ip6_route_dev_notifier = {
3702 .notifier_call = ip6_route_dev_notify,
3703 .priority = 0,
3704};
3705
433d49c3 3706int __init ip6_route_init(void)
1da177e4 3707{
433d49c3 3708 int ret;
8d0b94af 3709 int cpu;
433d49c3 3710
9a7ec3a9
DL		 3711 ret = -ENOMEM;
3712 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3713 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3714 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3715 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3716 goto out;
14e50e57 3717
fc66f95c 3718 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3719 if (ret)
bdb3289f 3720 goto out_kmem_cache;
bdb3289f 3721
c3426b47
DM		 3722 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3723 if (ret)
e8803b6c 3724 goto out_dst_entries;
2a0c451a 3725
7e52b33b
DM		 3726 ret = register_pernet_subsys(&ip6_route_net_ops);
3727 if (ret)
3728 goto out_register_inetpeer;
c3426b47 3729
5dc121e9
AE		 3730 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3731
8ed67789
DL		 3732 /* Registering of the loopback is done before this portion of code,
3733 * the loopback reference in rt6_info will not be taken, do it
3734 * manually for init_net */
d8d1f30b 3735 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3736 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3737 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3738 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3739 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3740 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3741 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3742 #endif
e8803b6c 3743 ret = fib6_init();
433d49c3 3744 if (ret)
8ed67789 3745 goto out_register_subsys;
433d49c3 3746
433d49c3
DL		 3747 ret = xfrm6_init();
3748 if (ret)
e8803b6c 3749 goto out_fib6_init;
c35b7e72 3750
433d49c3
DL		 3751 ret = fib6_rules_init();
3752 if (ret)
3753 goto xfrm6_init;
7e5449c2 3754
d189634e
TG		 3755 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3756 if (ret)
3757 goto fib6_rules_init;
3758
433d49c3 3759 ret = -ENOBUFS;
c7ac8679
GR		 3760 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3761 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3762 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3763 goto out_register_late_subsys;
c127ea2c 3764
8ed67789 3765 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3766 if (ret)
d189634e 3767 goto out_register_late_subsys;
8ed67789 3768
8d0b94af
MKL		 3769 for_each_possible_cpu(cpu) {
3770 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3771
3772 INIT_LIST_HEAD(&ul->head);
3773 spin_lock_init(&ul->lock);
3774 }
3775
433d49c3
DL		 3776out:
3777 return ret;
3778
d189634e
TG		 3779out_register_late_subsys:
3780 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3781fib6_rules_init:
433d49c3
DL		 3782 fib6_rules_cleanup();
3783xfrm6_init:
433d49c3 3784 xfrm6_fini();
2a0c451a
TG		 3785out_fib6_init:
3786 fib6_gc_cleanup();
8ed67789
DL		 3787out_register_subsys:
3788 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3789out_register_inetpeer:
3790 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3791out_dst_entries:
3792 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3793out_kmem_cache:
f2fc6a54 3794 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3795 goto out;
1da177e4
LT		 3796}
3797
3798void ip6_route_cleanup(void)
3799{
8ed67789 3800 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3801 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3802 fib6_rules_cleanup();
1da177e4 3803 xfrm6_fini();
1da177e4 3804 fib6_gc_cleanup();
c3426b47 3805 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3806 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3807 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3808 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3809}
Linux 6.x block layer and io_uring tree(s)