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r6040: move spinlock in r6040_close as SOFTIRQ-unsafe lock order detected
[linux-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 104 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 105 const struct in6_addr *gwaddr,
106 struct net_device *dev,
95c96174 107 unsigned int pref);
efa2cea0 108static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42 109 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 110 const struct in6_addr *gwaddr,
111 struct net_device *dev);
70ceb4f5
YH		 112#endif
113
8d0b94af
MKL		 114struct uncached_list {
115 spinlock_t lock;
116 struct list_head head;
117};
118
119static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
120
121static void rt6_uncached_list_add(struct rt6_info *rt)
122{
123 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
124
125 rt->dst.flags |= DST_NOCACHE;
126 rt->rt6i_uncached_list = ul;
127
128 spin_lock_bh(&ul->lock);
129 list_add_tail(&rt->rt6i_uncached, &ul->head);
130 spin_unlock_bh(&ul->lock);
131}
132
133static void rt6_uncached_list_del(struct rt6_info *rt)
134{
135 if (!list_empty(&rt->rt6i_uncached)) {
136 struct uncached_list *ul = rt->rt6i_uncached_list;
137
138 spin_lock_bh(&ul->lock);
139 list_del(&rt->rt6i_uncached);
140 spin_unlock_bh(&ul->lock);
141 }
142}
143
144static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
145{
146 struct net_device *loopback_dev = net->loopback_dev;
147 int cpu;
148
e332bc67
EB		 149 if (dev == loopback_dev)
150 return;
151
8d0b94af
MKL		 152 for_each_possible_cpu(cpu) {
153 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
154 struct rt6_info *rt;
155
156 spin_lock_bh(&ul->lock);
157 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
158 struct inet6_dev *rt_idev = rt->rt6i_idev;
159 struct net_device *rt_dev = rt->dst.dev;
160
e332bc67 161 if (rt_idev->dev == dev) {
8d0b94af
MKL		 162 rt->rt6i_idev = in6_dev_get(loopback_dev);
163 in6_dev_put(rt_idev);
164 }
165
e332bc67 166 if (rt_dev == dev) {
8d0b94af
MKL		 167 rt->dst.dev = loopback_dev;
168 dev_hold(rt->dst.dev);
169 dev_put(rt_dev);
170 }
171 }
172 spin_unlock_bh(&ul->lock);
173 }
174}
175
d52d3997
MKL		 176static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
177{
178 return dst_metrics_write_ptr(rt->dst.from);
179}
180
06582540
DM		 181static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
182{
4b32b5ad 183 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 184
d52d3997
MKL		 185 if (rt->rt6i_flags & RTF_PCPU)
186 return rt6_pcpu_cow_metrics(rt);
187 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 188 return NULL;
189 else
3b471175 190 return dst_cow_metrics_generic(dst, old);
06582540
DM		 191}
192
f894cbf8
DM		 193static inline const void *choose_neigh_daddr(struct rt6_info *rt,
194 struct sk_buff *skb,
195 const void *daddr)
39232973
DM		 196{
197 struct in6_addr *p = &rt->rt6i_gateway;
198
a7563f34 199 if (!ipv6_addr_any(p))
39232973 200 return (const void *) p;
f894cbf8
DM		 201 else if (skb)
202 return &ipv6_hdr(skb)->daddr;
39232973
DM		 203 return daddr;
204}
205
f894cbf8
DM		 206static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
207 struct sk_buff *skb,
208 const void *daddr)
d3aaeb38 209{
39232973
DM		 210 struct rt6_info *rt = (struct rt6_info *) dst;
211 struct neighbour *n;
212
f894cbf8 213 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 214 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 215 if (n)
216 return n;
217 return neigh_create(&nd_tbl, daddr, dst->dev);
218}
219
9a7ec3a9 220static struct dst_ops ip6_dst_ops_template = {
1da177e4 221 .family = AF_INET6,
1da177e4
LT		 222 .gc = ip6_dst_gc,
223 .gc_thresh = 1024,
224 .check = ip6_dst_check,
0dbaee3b 225 .default_advmss = ip6_default_advmss,
ebb762f2 226 .mtu = ip6_mtu,
06582540 227 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 228 .destroy = ip6_dst_destroy,
229 .ifdown = ip6_dst_ifdown,
230 .negative_advice = ip6_negative_advice,
231 .link_failure = ip6_link_failure,
232 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 233 .redirect = rt6_do_redirect,
9f8955cc 234 .local_out = __ip6_local_out,
d3aaeb38 235 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 236};
237
ebb762f2 238static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 239{
618f9bc7
SK		 240 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
241
242 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 243}
244
6700c270
DM		 245static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
246 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 247{
248}
249
6700c270
DM		 250static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
251 struct sk_buff *skb)
b587ee3b
DM		 252{
253}
254
14e50e57
DM		 255static struct dst_ops ip6_dst_blackhole_ops = {
256 .family = AF_INET6,
14e50e57
DM		 257 .destroy = ip6_dst_destroy,
258 .check = ip6_dst_check,
ebb762f2 259 .mtu = ip6_blackhole_mtu,
214f45c9 260 .default_advmss = ip6_default_advmss,
14e50e57 261 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 262 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 263 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 264 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 265};
266
62fa8a84 267static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 268 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 269};
270
fb0af4c7 271static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 272 .dst = {
273 .__refcnt = ATOMIC_INIT(1),
274 .__use = 1,
2c20cbd7 275 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 276 .error = -ENETUNREACH,
d8d1f30b
CG		 277 .input = ip6_pkt_discard,
278 .output = ip6_pkt_discard_out,
1da177e4
LT		 279 },
280 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 281 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 282 .rt6i_metric = ~(u32) 0,
283 .rt6i_ref = ATOMIC_INIT(1),
284};
285
101367c2
TG		 286#ifdef CONFIG_IPV6_MULTIPLE_TABLES
287
fb0af4c7 288static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 289 .dst = {
290 .__refcnt = ATOMIC_INIT(1),
291 .__use = 1,
2c20cbd7 292 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 293 .error = -EACCES,
d8d1f30b
CG		 294 .input = ip6_pkt_prohibit,
295 .output = ip6_pkt_prohibit_out,
101367c2
TG		 296 },
297 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 298 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 299 .rt6i_metric = ~(u32) 0,
300 .rt6i_ref = ATOMIC_INIT(1),
301};
302
fb0af4c7 303static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 304 .dst = {
305 .__refcnt = ATOMIC_INIT(1),
306 .__use = 1,
2c20cbd7 307 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 308 .error = -EINVAL,
d8d1f30b 309 .input = dst_discard,
ede2059d 310 .output = dst_discard_out,
101367c2
TG		 311 },
312 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 313 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 314 .rt6i_metric = ~(u32) 0,
315 .rt6i_ref = ATOMIC_INIT(1),
316};
317
318#endif
319
ebfa45f0
MKL		 320static void rt6_info_init(struct rt6_info *rt)
321{
322 struct dst_entry *dst = &rt->dst;
323
324 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
325 INIT_LIST_HEAD(&rt->rt6i_siblings);
326 INIT_LIST_HEAD(&rt->rt6i_uncached);
327}
328
1da177e4 329/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 330static struct rt6_info *__ip6_dst_alloc(struct net *net,
331 struct net_device *dev,
ad706862 332 int flags)
1da177e4 333{
97bab73f 334 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 335 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 336
ebfa45f0
MKL		 337 if (rt)
338 rt6_info_init(rt);
8104891b 339
cf911662 340 return rt;
1da177e4
LT		 341}
342
9ab179d8
DA		 343struct rt6_info *ip6_dst_alloc(struct net *net,
344 struct net_device *dev,
345 int flags)
d52d3997 346{
ad706862 347 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 348
349 if (rt) {
350 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
351 if (rt->rt6i_pcpu) {
352 int cpu;
353
354 for_each_possible_cpu(cpu) {
355 struct rt6_info **p;
356
357 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
358 /* no one shares rt */
359 *p = NULL;
360 }
361 } else {
362 dst_destroy((struct dst_entry *)rt);
363 return NULL;
364 }
365 }
366
367 return rt;
368}
9ab179d8 369EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 370
1da177e4
LT		 371static void ip6_dst_destroy(struct dst_entry *dst)
372{
373 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 374 struct dst_entry *from = dst->from;
8d0b94af 375 struct inet6_dev *idev;
1da177e4 376
4b32b5ad 377 dst_destroy_metrics_generic(dst);
87775312 378 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 379 rt6_uncached_list_del(rt);
380
381 idev = rt->rt6i_idev;
38308473 382 if (idev) {
1da177e4
LT		 383 rt->rt6i_idev = NULL;
384 in6_dev_put(idev);
1ab1457c 385 }
1716a961 386
ecd98837
YH		 387 dst->from = NULL;
388 dst_release(from);
b3419363
DM		 389}
390
1da177e4
LT		 391static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
392 int how)
393{
394 struct rt6_info *rt = (struct rt6_info *)dst;
395 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 396 struct net_device *loopback_dev =
c346dca1 397 dev_net(dev)->loopback_dev;
1da177e4 398
97cac082
DM		 399 if (dev != loopback_dev) {
400 if (idev && idev->dev == dev) {
401 struct inet6_dev *loopback_idev =
402 in6_dev_get(loopback_dev);
403 if (loopback_idev) {
404 rt->rt6i_idev = loopback_idev;
405 in6_dev_put(idev);
406 }
407 }
1da177e4
LT		 408 }
409}
410
5973fb1e
MKL		 411static bool __rt6_check_expired(const struct rt6_info *rt)
412{
413 if (rt->rt6i_flags & RTF_EXPIRES)
414 return time_after(jiffies, rt->dst.expires);
415 else
416 return false;
417}
418
a50feda5 419static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 420{
1716a961
G		 421 if (rt->rt6i_flags & RTF_EXPIRES) {
422 if (time_after(jiffies, rt->dst.expires))
a50feda5 423 return true;
1716a961 424 } else if (rt->dst.from) {
3fd91fb3 425 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 426 }
a50feda5 427 return false;
1da177e4
LT		 428}
429
51ebd318
ND		 430/* Multipath route selection:
431 * Hash based function using packet header and flowlabel.
432 * Adapted from fib_info_hashfn()
433 */
434static int rt6_info_hash_nhsfn(unsigned int candidate_count,
435 const struct flowi6 *fl6)
436{
644d0e65 437 return get_hash_from_flowi6(fl6) % candidate_count;
51ebd318
ND		 438}
439
440static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 441 struct flowi6 *fl6, int oif,
442 int strict)
51ebd318
ND		 443{
444 struct rt6_info *sibling, *next_sibling;
445 int route_choosen;
446
447 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
448 /* Don't change the route, if route_choosen == 0
449 * (siblings does not include ourself)
450 */
451 if (route_choosen)
452 list_for_each_entry_safe(sibling, next_sibling,
453 &match->rt6i_siblings, rt6i_siblings) {
454 route_choosen--;
455 if (route_choosen == 0) {
52bd4c0c
ND		 456 if (rt6_score_route(sibling, oif, strict) < 0)
457 break;
51ebd318
ND		 458 match = sibling;
459 break;
460 }
461 }
462 return match;
463}
464
1da177e4 465/*
c71099ac 466 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 467 */
468
8ed67789
DL		 469static inline struct rt6_info *rt6_device_match(struct net *net,
470 struct rt6_info *rt,
b71d1d42 471 const struct in6_addr *saddr,
1da177e4 472 int oif,
d420895e 473 int flags)
1da177e4
LT		 474{
475 struct rt6_info *local = NULL;
476 struct rt6_info *sprt;
477
dd3abc4e
YH		 478 if (!oif && ipv6_addr_any(saddr))
479 goto out;
480
d8d1f30b 481 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 482 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 483
484 if (oif) {
1da177e4
LT		 485 if (dev->ifindex == oif)
486 return sprt;
487 if (dev->flags & IFF_LOOPBACK) {
38308473 488 if (!sprt->rt6i_idev ||
1da177e4 489 sprt->rt6i_idev->dev->ifindex != oif) {
17fb0b2b 490 if (flags & RT6_LOOKUP_F_IFACE)
1da177e4 491 continue;
17fb0b2b
DA		 492 if (local &&
493 local->rt6i_idev->dev->ifindex == oif)
1da177e4
LT		 494 continue;
495 }
496 local = sprt;
497 }
dd3abc4e
YH		 498 } else {
499 if (ipv6_chk_addr(net, saddr, dev,
500 flags & RT6_LOOKUP_F_IFACE))
501 return sprt;
1da177e4 502 }
dd3abc4e 503 }
1da177e4 504
dd3abc4e 505 if (oif) {
1da177e4
LT		 506 if (local)
507 return local;
508
d420895e 509 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 510 return net->ipv6.ip6_null_entry;
1da177e4 511 }
dd3abc4e 512out:
1da177e4
LT		 513 return rt;
514}
515
27097255 516#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 517struct __rt6_probe_work {
518 struct work_struct work;
519 struct in6_addr target;
520 struct net_device *dev;
521};
522
523static void rt6_probe_deferred(struct work_struct *w)
524{
525 struct in6_addr mcaddr;
526 struct __rt6_probe_work *work =
527 container_of(w, struct __rt6_probe_work, work);
528
529 addrconf_addr_solict_mult(&work->target, &mcaddr);
adc176c5 530 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
c2f17e82 531 dev_put(work->dev);
662f5533 532 kfree(work);
c2f17e82
HFS		 533}
534
27097255
YH		 535static void rt6_probe(struct rt6_info *rt)
536{
990edb42 537 struct __rt6_probe_work *work;
f2c31e32 538 struct neighbour *neigh;
27097255
YH		 539 /*
540 * Okay, this does not seem to be appropriate
541 * for now, however, we need to check if it
542 * is really so; aka Router Reachability Probing.
543 *
544 * Router Reachability Probe MUST be rate-limited
545 * to no more than one per minute.
546 */
2152caea 547 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 548 return;
2152caea
YH		 549 rcu_read_lock_bh();
550 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
551 if (neigh) {
8d6c31bf
MKL		 552 if (neigh->nud_state & NUD_VALID)
553 goto out;
554
990edb42 555 work = NULL;
2152caea 556 write_lock(&neigh->lock);
990edb42
MKL		 557 if (!(neigh->nud_state & NUD_VALID) &&
558 time_after(jiffies,
559 neigh->updated +
560 rt->rt6i_idev->cnf.rtr_probe_interval)) {
561 work = kmalloc(sizeof(*work), GFP_ATOMIC);
562 if (work)
563 __neigh_set_probe_once(neigh);
c2f17e82 564 }
2152caea 565 write_unlock(&neigh->lock);
990edb42
MKL		 566 } else {
567 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 568 }
990edb42
MKL		 569
570 if (work) {
571 INIT_WORK(&work->work, rt6_probe_deferred);
572 work->target = rt->rt6i_gateway;
573 dev_hold(rt->dst.dev);
574 work->dev = rt->dst.dev;
575 schedule_work(&work->work);
576 }
577
8d6c31bf 578out:
2152caea 579 rcu_read_unlock_bh();
27097255
YH		 580}
581#else
582static inline void rt6_probe(struct rt6_info *rt)
583{
27097255
YH		 584}
585#endif
586
1da177e4 587/*
554cfb7e 588 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 589 */
b6f99a21 590static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 591{
d1918542 592 struct net_device *dev = rt->dst.dev;
161980f4 593 if (!oif || dev->ifindex == oif)
554cfb7e 594 return 2;
161980f4
DM		 595 if ((dev->flags & IFF_LOOPBACK) &&
596 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
597 return 1;
598 return 0;
554cfb7e 599}
1da177e4 600
afc154e9 601static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 602{
f2c31e32 603 struct neighbour *neigh;
afc154e9 604 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 605
4d0c5911
YH		 606 if (rt->rt6i_flags & RTF_NONEXTHOP ||
607 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 608 return RT6_NUD_SUCCEED;
145a3621
YH		 609
610 rcu_read_lock_bh();
611 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
612 if (neigh) {
613 read_lock(&neigh->lock);
554cfb7e 614 if (neigh->nud_state & NUD_VALID)
afc154e9 615 ret = RT6_NUD_SUCCEED;
398bcbeb 616#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 617 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 618 ret = RT6_NUD_SUCCEED;
7e980569
JB		 619 else
620 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 621#endif
145a3621 622 read_unlock(&neigh->lock);
afc154e9
HFS		 623 } else {
624 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 625 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 626 }
145a3621
YH		 627 rcu_read_unlock_bh();
628
a5a81f0b 629 return ret;
1da177e4
LT		 630}
631
554cfb7e
YH		 632static int rt6_score_route(struct rt6_info *rt, int oif,
633 int strict)
1da177e4 634{
a5a81f0b 635 int m;
1ab1457c 636
4d0c5911 637 m = rt6_check_dev(rt, oif);
77d16f45 638 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 639 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 640#ifdef CONFIG_IPV6_ROUTER_PREF
641 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
642#endif
afc154e9
HFS		 643 if (strict & RT6_LOOKUP_F_REACHABLE) {
644 int n = rt6_check_neigh(rt);
645 if (n < 0)
646 return n;
647 }
554cfb7e
YH		 648 return m;
649}
650
f11e6659 651static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 652 int *mpri, struct rt6_info *match,
653 bool *do_rr)
554cfb7e 654{
f11e6659 655 int m;
afc154e9 656 bool match_do_rr = false;
35103d11
AG		 657 struct inet6_dev *idev = rt->rt6i_idev;
658 struct net_device *dev = rt->dst.dev;
659
660 if (dev && !netif_carrier_ok(dev) &&
d5d32e4b
DA		 661 idev->cnf.ignore_routes_with_linkdown &&
662 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
35103d11 663 goto out;
f11e6659
DM		 664
665 if (rt6_check_expired(rt))
666 goto out;
667
668 m = rt6_score_route(rt, oif, strict);
7e980569 669 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 670 match_do_rr = true;
671 m = 0; /* lowest valid score */
7e980569 672 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 673 goto out;
afc154e9
HFS		 674 }
675
676 if (strict & RT6_LOOKUP_F_REACHABLE)
677 rt6_probe(rt);
f11e6659 678
7e980569 679 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 680 if (m > *mpri) {
afc154e9 681 *do_rr = match_do_rr;
f11e6659
DM		 682 *mpri = m;
683 match = rt;
f11e6659 684 }
f11e6659
DM		 685out:
686 return match;
687}
688
689static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
690 struct rt6_info *rr_head,
afc154e9
HFS		 691 u32 metric, int oif, int strict,
692 bool *do_rr)
f11e6659 693{
9fbdcfaf 694 struct rt6_info *rt, *match, *cont;
554cfb7e 695 int mpri = -1;
1da177e4 696
f11e6659 697 match = NULL;
9fbdcfaf
SK		 698 cont = NULL;
699 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
700 if (rt->rt6i_metric != metric) {
701 cont = rt;
702 break;
703 }
704
705 match = find_match(rt, oif, strict, &mpri, match, do_rr);
706 }
707
708 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
709 if (rt->rt6i_metric != metric) {
710 cont = rt;
711 break;
712 }
713
afc154e9 714 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 715 }
716
717 if (match || !cont)
718 return match;
719
720 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 721 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 722
f11e6659
DM		 723 return match;
724}
1da177e4 725
f11e6659
DM		 726static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
727{
728 struct rt6_info *match, *rt0;
8ed67789 729 struct net *net;
afc154e9 730 bool do_rr = false;
1da177e4 731
f11e6659
DM		 732 rt0 = fn->rr_ptr;
733 if (!rt0)
734 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 735
afc154e9
HFS		 736 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
737 &do_rr);
1da177e4 738
afc154e9 739 if (do_rr) {
d8d1f30b 740 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 741
554cfb7e 742 /* no entries matched; do round-robin */
f11e6659
DM		 743 if (!next || next->rt6i_metric != rt0->rt6i_metric)
744 next = fn->leaf;
745
746 if (next != rt0)
747 fn->rr_ptr = next;
1da177e4 748 }
1da177e4 749
d1918542 750 net = dev_net(rt0->dst.dev);
a02cec21 751 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 752}
753
8b9df265
MKL		 754static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
755{
756 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
757}
758
70ceb4f5
YH		 759#ifdef CONFIG_IPV6_ROUTE_INFO
760int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 761 const struct in6_addr *gwaddr)
70ceb4f5 762{
c346dca1 763 struct net *net = dev_net(dev);
70ceb4f5
YH		 764 struct route_info *rinfo = (struct route_info *) opt;
765 struct in6_addr prefix_buf, *prefix;
766 unsigned int pref;
4bed72e4 767 unsigned long lifetime;
70ceb4f5
YH		 768 struct rt6_info *rt;
769
770 if (len < sizeof(struct route_info)) {
771 return -EINVAL;
772 }
773
774 /* Sanity check for prefix_len and length */
775 if (rinfo->length > 3) {
776 return -EINVAL;
777 } else if (rinfo->prefix_len > 128) {
778 return -EINVAL;
779 } else if (rinfo->prefix_len > 64) {
780 if (rinfo->length < 2) {
781 return -EINVAL;
782 }
783 } else if (rinfo->prefix_len > 0) {
784 if (rinfo->length < 1) {
785 return -EINVAL;
786 }
787 }
788
789 pref = rinfo->route_pref;
790 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 791 return -EINVAL;
70ceb4f5 792
4bed72e4 793 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 794
795 if (rinfo->length == 3)
796 prefix = (struct in6_addr *)rinfo->prefix;
797 else {
798 /* this function is safe */
799 ipv6_addr_prefix(&prefix_buf,
800 (struct in6_addr *)rinfo->prefix,
801 rinfo->prefix_len);
802 prefix = &prefix_buf;
803 }
804
f104a567
DJ		 805 if (rinfo->prefix_len == 0)
806 rt = rt6_get_dflt_router(gwaddr, dev);
807 else
808 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
830218c1 809 gwaddr, dev);
70ceb4f5
YH		 810
811 if (rt && !lifetime) {
e0a1ad73 812 ip6_del_rt(rt);
70ceb4f5
YH		 813 rt = NULL;
814 }
815
816 if (!rt && lifetime)
830218c1
DA		 817 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
818 dev, pref);
70ceb4f5
YH		 819 else if (rt)
820 rt->rt6i_flags = RTF_ROUTEINFO |
821 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
822
823 if (rt) {
1716a961
G		 824 if (!addrconf_finite_timeout(lifetime))
825 rt6_clean_expires(rt);
826 else
827 rt6_set_expires(rt, jiffies + HZ * lifetime);
828
94e187c0 829 ip6_rt_put(rt);
70ceb4f5
YH		 830 }
831 return 0;
832}
833#endif
834
a3c00e46
MKL		 835static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
836 struct in6_addr *saddr)
837{
838 struct fib6_node *pn;
839 while (1) {
840 if (fn->fn_flags & RTN_TL_ROOT)
841 return NULL;
842 pn = fn->parent;
843 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
844 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
845 else
846 fn = pn;
847 if (fn->fn_flags & RTN_RTINFO)
848 return fn;
849 }
850}
c71099ac 851
8ed67789
DL		 852static struct rt6_info *ip6_pol_route_lookup(struct net *net,
853 struct fib6_table *table,
4c9483b2 854 struct flowi6 *fl6, int flags)
1da177e4
LT		 855{
856 struct fib6_node *fn;
857 struct rt6_info *rt;
858
c71099ac 859 read_lock_bh(&table->tb6_lock);
4c9483b2 860 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 861restart:
862 rt = fn->leaf;
4c9483b2 863 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 864 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 865 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 866 if (rt == net->ipv6.ip6_null_entry) {
867 fn = fib6_backtrack(fn, &fl6->saddr);
868 if (fn)
869 goto restart;
870 }
d8d1f30b 871 dst_use(&rt->dst, jiffies);
c71099ac 872 read_unlock_bh(&table->tb6_lock);
b811580d
DA		 873
874 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
875
c71099ac
TG		 876 return rt;
877
878}
879
67ba4152 880struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 881 int flags)
882{
883 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
884}
885EXPORT_SYMBOL_GPL(ip6_route_lookup);
886
9acd9f3a
YH		 887struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
888 const struct in6_addr *saddr, int oif, int strict)
c71099ac 889{
4c9483b2
DM		 890 struct flowi6 fl6 = {
891 .flowi6_oif = oif,
892 .daddr = *daddr,
c71099ac
TG		 893 };
894 struct dst_entry *dst;
77d16f45 895 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 896
adaa70bb 897 if (saddr) {
4c9483b2 898 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 899 flags |= RT6_LOOKUP_F_HAS_SADDR;
900 }
901
4c9483b2 902 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 903 if (dst->error == 0)
904 return (struct rt6_info *) dst;
905
906 dst_release(dst);
907
1da177e4
LT		 908 return NULL;
909}
7159039a
YH		 910EXPORT_SYMBOL(rt6_lookup);
911
c71099ac 912/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 913 It takes new route entry, the addition fails by any reason the
914 route is freed. In any case, if caller does not hold it, it may
915 be destroyed.
916 */
917
e5fd387a 918static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 919 struct mx6_config *mxc)
1da177e4
LT		 920{
921 int err;
c71099ac 922 struct fib6_table *table;
1da177e4 923
c71099ac
TG		 924 table = rt->rt6i_table;
925 write_lock_bh(&table->tb6_lock);
e715b6d3 926 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 927 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 928
929 return err;
930}
931
40e22e8f
TG		 932int ip6_ins_rt(struct rt6_info *rt)
933{
e715b6d3
FW		 934 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
935 struct mx6_config mxc = { .mx = NULL, };
936
937 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 938}
939
8b9df265
MKL		 940static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
941 const struct in6_addr *daddr,
942 const struct in6_addr *saddr)
1da177e4 943{
1da177e4
LT		 944 struct rt6_info *rt;
945
946 /*
947 * Clone the route.
948 */
949
d52d3997 950 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 951 ort = (struct rt6_info *)ort->dst.from;
1da177e4 952
ad706862 953 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 954
955 if (!rt)
956 return NULL;
957
958 ip6_rt_copy_init(rt, ort);
959 rt->rt6i_flags |= RTF_CACHE;
960 rt->rt6i_metric = 0;
961 rt->dst.flags |= DST_HOST;
962 rt->rt6i_dst.addr = *daddr;
963 rt->rt6i_dst.plen = 128;
1da177e4 964
83a09abd
MKL		 965 if (!rt6_is_gw_or_nonexthop(ort)) {
966 if (ort->rt6i_dst.plen != 128 &&
967 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
968 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 969#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 970 if (rt->rt6i_src.plen && saddr) {
971 rt->rt6i_src.addr = *saddr;
972 rt->rt6i_src.plen = 128;
8b9df265 973 }
83a09abd 974#endif
95a9a5ba 975 }
1da177e4 976
95a9a5ba
YH		 977 return rt;
978}
1da177e4 979
d52d3997
MKL		 980static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
981{
982 struct rt6_info *pcpu_rt;
983
984 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 985 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 986
987 if (!pcpu_rt)
988 return NULL;
989 ip6_rt_copy_init(pcpu_rt, rt);
990 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
991 pcpu_rt->rt6i_flags |= RTF_PCPU;
992 return pcpu_rt;
993}
994
995/* It should be called with read_lock_bh(&tb6_lock) acquired */
996static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
997{
a73e4195 998 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 999
1000 p = this_cpu_ptr(rt->rt6i_pcpu);
1001 pcpu_rt = *p;
1002
a73e4195
MKL		 1003 if (pcpu_rt) {
1004 dst_hold(&pcpu_rt->dst);
1005 rt6_dst_from_metrics_check(pcpu_rt);
1006 }
1007 return pcpu_rt;
1008}
1009
1010static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1011{
9c7370a1 1012 struct fib6_table *table = rt->rt6i_table;
a73e4195 1013 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1014
1015 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1016 if (!pcpu_rt) {
1017 struct net *net = dev_net(rt->dst.dev);
1018
9c7370a1
MKL		 1019 dst_hold(&net->ipv6.ip6_null_entry->dst);
1020 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1021 }
1022
9c7370a1
MKL		 1023 read_lock_bh(&table->tb6_lock);
1024 if (rt->rt6i_pcpu) {
1025 p = this_cpu_ptr(rt->rt6i_pcpu);
1026 prev = cmpxchg(p, NULL, pcpu_rt);
1027 if (prev) {
1028 /* If someone did it before us, return prev instead */
1029 dst_destroy(&pcpu_rt->dst);
1030 pcpu_rt = prev;
1031 }
1032 } else {
1033 /* rt has been removed from the fib6 tree
1034 * before we have a chance to acquire the read_lock.
1035 * In this case, don't brother to create a pcpu rt
1036 * since rt is going away anyway. The next
1037 * dst_check() will trigger a re-lookup.
1038 */
d52d3997 1039 dst_destroy(&pcpu_rt->dst);
9c7370a1 1040 pcpu_rt = rt;
d52d3997 1041 }
d52d3997
MKL		 1042 dst_hold(&pcpu_rt->dst);
1043 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1044 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1045 return pcpu_rt;
1046}
1047
9ff74384
DA		 1048struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1049 int oif, struct flowi6 *fl6, int flags)
1da177e4 1050{
367efcb9 1051 struct fib6_node *fn, *saved_fn;
45e4fd26 1052 struct rt6_info *rt;
c71099ac 1053 int strict = 0;
1da177e4 1054
77d16f45 1055 strict |= flags & RT6_LOOKUP_F_IFACE;
d5d32e4b 1056 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
367efcb9
MKL		 1057 if (net->ipv6.devconf_all->forwarding == 0)
1058 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1059
c71099ac 1060 read_lock_bh(&table->tb6_lock);
1da177e4 1061
4c9483b2 1062 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1063 saved_fn = fn;
1da177e4 1064
ca254490
DA		 1065 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1066 oif = 0;
1067
a3c00e46 1068redo_rt6_select:
367efcb9 1069 rt = rt6_select(fn, oif, strict);
52bd4c0c 1070 if (rt->rt6i_nsiblings)
367efcb9 1071 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1072 if (rt == net->ipv6.ip6_null_entry) {
1073 fn = fib6_backtrack(fn, &fl6->saddr);
1074 if (fn)
1075 goto redo_rt6_select;
367efcb9
MKL		 1076 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1077 /* also consider unreachable route */
1078 strict &= ~RT6_LOOKUP_F_REACHABLE;
1079 fn = saved_fn;
1080 goto redo_rt6_select;
367efcb9 1081 }
a3c00e46
MKL		 1082 }
1083
fb9de91e 1084
3da59bd9 1085 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1086 dst_use(&rt->dst, jiffies);
1087 read_unlock_bh(&table->tb6_lock);
1088
1089 rt6_dst_from_metrics_check(rt);
b811580d
DA		 1090
1091 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
d52d3997 1092 return rt;
3da59bd9
MKL		 1093 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1094 !(rt->rt6i_flags & RTF_GATEWAY))) {
1095 /* Create a RTF_CACHE clone which will not be
1096 * owned by the fib6 tree. It is for the special case where
1097 * the daddr in the skb during the neighbor look-up is different
1098 * from the fl6->daddr used to look-up route here.
1099 */
1100
1101 struct rt6_info *uncached_rt;
1102
d52d3997
MKL		 1103 dst_use(&rt->dst, jiffies);
1104 read_unlock_bh(&table->tb6_lock);
1105
3da59bd9
MKL		 1106 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1107 dst_release(&rt->dst);
c71099ac 1108
3da59bd9 1109 if (uncached_rt)
8d0b94af 1110 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1111 else
1112 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1113
3da59bd9 1114 dst_hold(&uncached_rt->dst);
b811580d
DA		 1115
1116 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
3da59bd9 1117 return uncached_rt;
3da59bd9 1118
d52d3997
MKL		 1119 } else {
1120 /* Get a percpu copy */
1121
1122 struct rt6_info *pcpu_rt;
1123
1124 rt->dst.lastuse = jiffies;
1125 rt->dst.__use++;
1126 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1127
9c7370a1
MKL		 1128 if (pcpu_rt) {
1129 read_unlock_bh(&table->tb6_lock);
1130 } else {
1131 /* We have to do the read_unlock first
1132 * because rt6_make_pcpu_route() may trigger
1133 * ip6_dst_gc() which will take the write_lock.
1134 */
1135 dst_hold(&rt->dst);
1136 read_unlock_bh(&table->tb6_lock);
a73e4195 1137 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1138 dst_release(&rt->dst);
1139 }
d52d3997 1140
b811580d 1141 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
d52d3997 1142 return pcpu_rt;
9c7370a1 1143
d52d3997 1144 }
1da177e4 1145}
9ff74384 1146EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 1147
8ed67789 1148static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1149 struct flowi6 *fl6, int flags)
4acad72d 1150{
4c9483b2 1151 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1152}
1153
d409b847
MB		 1154struct dst_entry *ip6_route_input_lookup(struct net *net,
1155 struct net_device *dev,
1156 struct flowi6 *fl6, int flags)
72331bc0
SL		 1157{
1158 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1159 flags |= RT6_LOOKUP_F_IFACE;
1160
1161 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1162}
d409b847 1163EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
72331bc0 1164
c71099ac
TG		 1165void ip6_route_input(struct sk_buff *skb)
1166{
b71d1d42 1167 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1168 struct net *net = dev_net(skb->dev);
adaa70bb 1169 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1170 struct ip_tunnel_info *tun_info;
4c9483b2 1171 struct flowi6 fl6 = {
e0d56fdd 1172 .flowi6_iif = skb->dev->ifindex,
4c9483b2
DM		 1173 .daddr = iph->daddr,
1174 .saddr = iph->saddr,
6502ca52 1175 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1176 .flowi6_mark = skb->mark,
1177 .flowi6_proto = iph->nexthdr,
c71099ac 1178 };
adaa70bb 1179
904af04d 1180 tun_info = skb_tunnel_info(skb);
46fa062a 1181 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1182 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1183 skb_dst_drop(skb);
72331bc0 1184 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1185}
1186
8ed67789 1187static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1188 struct flowi6 *fl6, int flags)
1da177e4 1189{
4c9483b2 1190 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1191}
1192
6f21c96a
PA		 1193struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1194 struct flowi6 *fl6, int flags)
c71099ac 1195{
d46a9d67 1196 bool any_src;
c71099ac 1197
4c1feac5
DA		 1198 if (rt6_need_strict(&fl6->daddr)) {
1199 struct dst_entry *dst;
1200
1201 dst = l3mdev_link_scope_lookup(net, fl6);
1202 if (dst)
1203 return dst;
1204 }
ca254490 1205
1fb9489b 1206 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1207
d46a9d67 1208 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1209 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1210 (fl6->flowi6_oif && any_src))
77d16f45 1211 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1212
d46a9d67 1213 if (!any_src)
adaa70bb 1214 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1215 else if (sk)
1216 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1217
4c9483b2 1218 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1219}
6f21c96a 1220EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 1221
2774c131 1222struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1223{
5c1e6aa3 1224 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1225 struct dst_entry *new = NULL;
1226
f5b0a874 1227 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1228 if (rt) {
0a1f5962 1229 rt6_info_init(rt);
8104891b 1230
0a1f5962 1231 new = &rt->dst;
14e50e57 1232 new->__use = 1;
352e512c 1233 new->input = dst_discard;
ede2059d 1234 new->output = dst_discard_out;
14e50e57 1235
0a1f5962 1236 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1237 rt->rt6i_idev = ort->rt6i_idev;
1238 if (rt->rt6i_idev)
1239 in6_dev_hold(rt->rt6i_idev);
14e50e57 1240
4e3fd7a0 1241 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1242 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1243 rt->rt6i_metric = 0;
1244
1245 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1246#ifdef CONFIG_IPV6_SUBTREES
1247 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1248#endif
1249
1250 dst_free(new);
1251 }
1252
69ead7af
DM		 1253 dst_release(dst_orig);
1254 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1255}
14e50e57 1256
1da177e4
LT		 1257/*
1258 * Destination cache support functions
1259 */
1260
4b32b5ad
MKL		 1261static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1262{
1263 if (rt->dst.from &&
1264 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1265 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1266}
1267
3da59bd9
MKL		 1268static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1269{
1270 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1271 return NULL;
1272
1273 if (rt6_check_expired(rt))
1274 return NULL;
1275
1276 return &rt->dst;
1277}
1278
1279static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1280{
5973fb1e
MKL		 1281 if (!__rt6_check_expired(rt) &&
1282 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
3da59bd9
MKL		 1283 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1284 return &rt->dst;
1285 else
1286 return NULL;
1287}
1288
1da177e4
LT		 1289static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1290{
1291 struct rt6_info *rt;
1292
1293 rt = (struct rt6_info *) dst;
1294
6f3118b5
ND		 1295 /* All IPV6 dsts are created with ->obsolete set to the value
1296 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1297 * into this function always.
1298 */
e3bc10bd 1299
4b32b5ad
MKL		 1300 rt6_dst_from_metrics_check(rt);
1301
02bcf4e0
MKL		 1302 if (rt->rt6i_flags & RTF_PCPU ||
1303 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
3da59bd9
MKL		 1304 return rt6_dst_from_check(rt, cookie);
1305 else
1306 return rt6_check(rt, cookie);
1da177e4
LT		 1307}
1308
1309static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1310{
1311 struct rt6_info *rt = (struct rt6_info *) dst;
1312
1313 if (rt) {
54c1a859
YH		 1314 if (rt->rt6i_flags & RTF_CACHE) {
1315 if (rt6_check_expired(rt)) {
1316 ip6_del_rt(rt);
1317 dst = NULL;
1318 }
1319 } else {
1da177e4 1320 dst_release(dst);
54c1a859
YH		 1321 dst = NULL;
1322 }
1da177e4 1323 }
54c1a859 1324 return dst;
1da177e4
LT		 1325}
1326
1327static void ip6_link_failure(struct sk_buff *skb)
1328{
1329 struct rt6_info *rt;
1330
3ffe533c 1331 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1332
adf30907 1333 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1334 if (rt) {
1eb4f758
HFS		 1335 if (rt->rt6i_flags & RTF_CACHE) {
1336 dst_hold(&rt->dst);
8e3d5be7 1337 ip6_del_rt(rt);
1eb4f758 1338 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1339 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1340 }
1da177e4
LT		 1341 }
1342}
1343
45e4fd26
MKL		 1344static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1345{
1346 struct net *net = dev_net(rt->dst.dev);
1347
1348 rt->rt6i_flags |= RTF_MODIFIED;
1349 rt->rt6i_pmtu = mtu;
1350 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1351}
1352
0d3f6d29
MKL		 1353static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1354{
1355 return !(rt->rt6i_flags & RTF_CACHE) &&
1356 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1357}
1358
45e4fd26
MKL		 1359static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1360 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1361{
67ba4152 1362 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1363
45e4fd26
MKL		 1364 if (rt6->rt6i_flags & RTF_LOCAL)
1365 return;
81aded24 1366
19bda36c
XL		 1367 if (dst_metric_locked(dst, RTAX_MTU))
1368 return;
1369
45e4fd26
MKL		 1370 dst_confirm(dst);
1371 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1372 if (mtu >= dst_mtu(dst))
1373 return;
9d289715 1374
0d3f6d29 1375 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26
MKL		 1376 rt6_do_update_pmtu(rt6, mtu);
1377 } else {
1378 const struct in6_addr *daddr, *saddr;
1379 struct rt6_info *nrt6;
1380
1381 if (iph) {
1382 daddr = &iph->daddr;
1383 saddr = &iph->saddr;
1384 } else if (sk) {
1385 daddr = &sk->sk_v6_daddr;
1386 saddr = &inet6_sk(sk)->saddr;
1387 } else {
1388 return;
1389 }
1390 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1391 if (nrt6) {
1392 rt6_do_update_pmtu(nrt6, mtu);
1393
1394 /* ip6_ins_rt(nrt6) will bump the
1395 * rt6->rt6i_node->fn_sernum
1396 * which will fail the next rt6_check() and
1397 * invalidate the sk->sk_dst_cache.
1398 */
1399 ip6_ins_rt(nrt6);
1400 }
1da177e4
LT		 1401 }
1402}
1403
45e4fd26
MKL		 1404static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1405 struct sk_buff *skb, u32 mtu)
1406{
1407 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1408}
1409
42ae66c8 1410void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
e2d118a1 1411 int oif, u32 mark, kuid_t uid)
81aded24
DM		 1412{
1413 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1414 struct dst_entry *dst;
1415 struct flowi6 fl6;
1416
1417 memset(&fl6, 0, sizeof(fl6));
1418 fl6.flowi6_oif = oif;
1b3c61dc 1419 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1420 fl6.daddr = iph->daddr;
1421 fl6.saddr = iph->saddr;
6502ca52 1422 fl6.flowlabel = ip6_flowinfo(iph);
e2d118a1 1423 fl6.flowi6_uid = uid;
81aded24
DM		 1424
1425 dst = ip6_route_output(net, NULL, &fl6);
1426 if (!dst->error)
45e4fd26 1427 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1428 dst_release(dst);
1429}
1430EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1431
1432void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1433{
33c162a9
MKL		 1434 struct dst_entry *dst;
1435
81aded24 1436 ip6_update_pmtu(skb, sock_net(sk), mtu,
e2d118a1 1437 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
33c162a9
MKL		 1438
1439 dst = __sk_dst_get(sk);
1440 if (!dst || !dst->obsolete ||
1441 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1442 return;
1443
1444 bh_lock_sock(sk);
1445 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1446 ip6_datagram_dst_update(sk, false);
1447 bh_unlock_sock(sk);
81aded24
DM		 1448}
1449EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1450
b55b76b2
DJ		 1451/* Handle redirects */
1452struct ip6rd_flowi {
1453 struct flowi6 fl6;
1454 struct in6_addr gateway;
1455};
1456
1457static struct rt6_info *__ip6_route_redirect(struct net *net,
1458 struct fib6_table *table,
1459 struct flowi6 *fl6,
1460 int flags)
1461{
1462 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1463 struct rt6_info *rt;
1464 struct fib6_node *fn;
1465
1466 /* Get the "current" route for this destination and
1467 * check if the redirect has come from approriate router.
1468 *
1469 * RFC 4861 specifies that redirects should only be
1470 * accepted if they come from the nexthop to the target.
1471 * Due to the way the routes are chosen, this notion
1472 * is a bit fuzzy and one might need to check all possible
1473 * routes.
1474 */
1475
1476 read_lock_bh(&table->tb6_lock);
1477 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1478restart:
1479 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1480 if (rt6_check_expired(rt))
1481 continue;
1482 if (rt->dst.error)
1483 break;
1484 if (!(rt->rt6i_flags & RTF_GATEWAY))
1485 continue;
1486 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1487 continue;
1488 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1489 continue;
1490 break;
1491 }
1492
1493 if (!rt)
1494 rt = net->ipv6.ip6_null_entry;
1495 else if (rt->dst.error) {
1496 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1497 goto out;
1498 }
1499
1500 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1501 fn = fib6_backtrack(fn, &fl6->saddr);
1502 if (fn)
1503 goto restart;
b55b76b2 1504 }
a3c00e46 1505
b0a1ba59 1506out:
b55b76b2
DJ		 1507 dst_hold(&rt->dst);
1508
1509 read_unlock_bh(&table->tb6_lock);
1510
b811580d 1511 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
b55b76b2
DJ		 1512 return rt;
1513};
1514
1515static struct dst_entry *ip6_route_redirect(struct net *net,
1516 const struct flowi6 *fl6,
1517 const struct in6_addr *gateway)
1518{
1519 int flags = RT6_LOOKUP_F_HAS_SADDR;
1520 struct ip6rd_flowi rdfl;
1521
1522 rdfl.fl6 = *fl6;
1523 rdfl.gateway = *gateway;
1524
1525 return fib6_rule_lookup(net, &rdfl.fl6,
1526 flags, __ip6_route_redirect);
1527}
1528
e2d118a1
LC		 1529void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
1530 kuid_t uid)
3a5ad2ee
DM		 1531{
1532 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1533 struct dst_entry *dst;
1534 struct flowi6 fl6;
1535
1536 memset(&fl6, 0, sizeof(fl6));
e374c618 1537 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1538 fl6.flowi6_oif = oif;
1539 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1540 fl6.daddr = iph->daddr;
1541 fl6.saddr = iph->saddr;
6502ca52 1542 fl6.flowlabel = ip6_flowinfo(iph);
e2d118a1 1543 fl6.flowi6_uid = uid;
3a5ad2ee 1544
b55b76b2
DJ		 1545 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1546 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1547 dst_release(dst);
1548}
1549EXPORT_SYMBOL_GPL(ip6_redirect);
1550
c92a59ec
DJ		 1551void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1552 u32 mark)
1553{
1554 const struct ipv6hdr *iph = ipv6_hdr(skb);
1555 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1556 struct dst_entry *dst;
1557 struct flowi6 fl6;
1558
1559 memset(&fl6, 0, sizeof(fl6));
e374c618 1560 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1561 fl6.flowi6_oif = oif;
1562 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1563 fl6.daddr = msg->dest;
1564 fl6.saddr = iph->daddr;
e2d118a1 1565 fl6.flowi6_uid = sock_net_uid(net, NULL);
c92a59ec 1566
b55b76b2
DJ		 1567 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1568 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1569 dst_release(dst);
1570}
1571
3a5ad2ee
DM		 1572void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1573{
e2d118a1
LC		 1574 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
1575 sk->sk_uid);
3a5ad2ee
DM		 1576}
1577EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1578
0dbaee3b 1579static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1580{
0dbaee3b
DM		 1581 struct net_device *dev = dst->dev;
1582 unsigned int mtu = dst_mtu(dst);
1583 struct net *net = dev_net(dev);
1584
1da177e4
LT		 1585 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1586
5578689a
DL		 1587 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1588 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1589
1590 /*
1ab1457c
YH		 1591 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1592 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1593 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1594 * rely only on pmtu discovery"
1595 */
1596 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1597 mtu = IPV6_MAXPLEN;
1598 return mtu;
1599}
1600
ebb762f2 1601static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1602{
4b32b5ad
MKL		 1603 const struct rt6_info *rt = (const struct rt6_info *)dst;
1604 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1605 struct inet6_dev *idev;
618f9bc7 1606
4b32b5ad
MKL		 1607 if (mtu)
1608 goto out;
1609
1610 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1611 if (mtu)
30f78d8e 1612 goto out;
618f9bc7
SK		 1613
1614 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1615
1616 rcu_read_lock();
1617 idev = __in6_dev_get(dst->dev);
1618 if (idev)
1619 mtu = idev->cnf.mtu6;
1620 rcu_read_unlock();
1621
30f78d8e 1622out:
14972cbd
RP		 1623 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1624
1625 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
d33e4553
DM		 1626}
1627
3b00944c
YH		 1628static struct dst_entry *icmp6_dst_gc_list;
1629static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1630
3b00944c 1631struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1632 struct flowi6 *fl6)
1da177e4 1633{
87a11578 1634 struct dst_entry *dst;
1da177e4
LT		 1635 struct rt6_info *rt;
1636 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1637 struct net *net = dev_net(dev);
1da177e4 1638
38308473 1639 if (unlikely(!idev))
122bdf67 1640 return ERR_PTR(-ENODEV);
1da177e4 1641
ad706862 1642 rt = ip6_dst_alloc(net, dev, 0);
38308473 1643 if (unlikely(!rt)) {
1da177e4 1644 in6_dev_put(idev);
87a11578 1645 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1646 goto out;
1647 }
1648
8e2ec639
YZ		 1649 rt->dst.flags |= DST_HOST;
1650 rt->dst.output = ip6_output;
d8d1f30b 1651 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1652 rt->rt6i_gateway = fl6->daddr;
87a11578 1653 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1654 rt->rt6i_dst.plen = 128;
1655 rt->rt6i_idev = idev;
14edd87d 1656 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1657
3b00944c 1658 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1659 rt->dst.next = icmp6_dst_gc_list;
1660 icmp6_dst_gc_list = &rt->dst;
3b00944c 1661 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1662
5578689a 1663 fib6_force_start_gc(net);
1da177e4 1664
87a11578
DM		 1665 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1666
1da177e4 1667out:
87a11578 1668 return dst;
1da177e4
LT		 1669}
1670
3d0f24a7 1671int icmp6_dst_gc(void)
1da177e4 1672{
e9476e95 1673 struct dst_entry *dst, **pprev;
3d0f24a7 1674 int more = 0;
1da177e4 1675
3b00944c
YH		 1676 spin_lock_bh(&icmp6_dst_lock);
1677 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1678
1da177e4
LT		 1679 while ((dst = *pprev) != NULL) {
1680 if (!atomic_read(&dst->__refcnt)) {
1681 *pprev = dst->next;
1682 dst_free(dst);
1da177e4
LT		 1683 } else {
1684 pprev = &dst->next;
3d0f24a7 1685 ++more;
1da177e4
LT		 1686 }
1687 }
1688
3b00944c 1689 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1690
3d0f24a7 1691 return more;
1da177e4
LT		 1692}
1693
1e493d19
DM		 1694static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1695 void *arg)
1696{
1697 struct dst_entry *dst, **pprev;
1698
1699 spin_lock_bh(&icmp6_dst_lock);
1700 pprev = &icmp6_dst_gc_list;
1701 while ((dst = *pprev) != NULL) {
1702 struct rt6_info *rt = (struct rt6_info *) dst;
1703 if (func(rt, arg)) {
1704 *pprev = dst->next;
1705 dst_free(dst);
1706 } else {
1707 pprev = &dst->next;
1708 }
1709 }
1710 spin_unlock_bh(&icmp6_dst_lock);
1711}
1712
569d3645 1713static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1714{
86393e52 1715 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1716 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1717 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1718 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1719 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1720 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1721 int entries;
7019b78e 1722
fc66f95c 1723 entries = dst_entries_get_fast(ops);
49a18d86 1724 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1725 entries <= rt_max_size)
1da177e4
LT		 1726 goto out;
1727
6891a346 1728 net->ipv6.ip6_rt_gc_expire++;
14956643 1729 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1730 entries = dst_entries_get_slow(ops);
1731 if (entries < ops->gc_thresh)
7019b78e 1732 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1733out:
7019b78e 1734 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1735 return entries > rt_max_size;
1da177e4
LT		 1736}
1737
e715b6d3
FW		 1738static int ip6_convert_metrics(struct mx6_config *mxc,
1739 const struct fib6_config *cfg)
1740{
c3a8d947 1741 bool ecn_ca = false;
e715b6d3
FW		 1742 struct nlattr *nla;
1743 int remaining;
1744 u32 *mp;
1745
63159f29 1746 if (!cfg->fc_mx)
e715b6d3
FW		 1747 return 0;
1748
1749 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1750 if (unlikely(!mp))
1751 return -ENOMEM;
1752
1753 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1754 int type = nla_type(nla);
1bb14807 1755 u32 val;
e715b6d3 1756
1bb14807
DB		 1757 if (!type)
1758 continue;
1759 if (unlikely(type > RTAX_MAX))
1760 goto err;
ea697639 1761
1bb14807
DB		 1762 if (type == RTAX_CC_ALGO) {
1763 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1764
1bb14807 1765 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1766 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1767 if (val == TCP_CA_UNSPEC)
1768 goto err;
1769 } else {
1770 val = nla_get_u32(nla);
e715b6d3 1771 }
626abd59
PA		 1772 if (type == RTAX_HOPLIMIT && val > 255)
1773 val = 255;
b8d3e416
DB		 1774 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1775 goto err;
1bb14807
DB		 1776
1777 mp[type - 1] = val;
1778 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1779 }
1780
c3a8d947
DB		 1781 if (ecn_ca) {
1782 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1783 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1784 }
e715b6d3 1785
c3a8d947 1786 mxc->mx = mp;
e715b6d3
FW		 1787 return 0;
1788 err:
1789 kfree(mp);
1790 return -EINVAL;
1791}
1da177e4 1792
8c14586f
DA		 1793static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1794 struct fib6_config *cfg,
1795 const struct in6_addr *gw_addr)
1796{
1797 struct flowi6 fl6 = {
1798 .flowi6_oif = cfg->fc_ifindex,
1799 .daddr = *gw_addr,
1800 .saddr = cfg->fc_prefsrc,
1801 };
1802 struct fib6_table *table;
1803 struct rt6_info *rt;
d5d32e4b 1804 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
8c14586f
DA		 1805
1806 table = fib6_get_table(net, cfg->fc_table);
1807 if (!table)
1808 return NULL;
1809
1810 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1811 flags |= RT6_LOOKUP_F_HAS_SADDR;
1812
1813 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1814
1815 /* if table lookup failed, fall back to full lookup */
1816 if (rt == net->ipv6.ip6_null_entry) {
1817 ip6_rt_put(rt);
1818 rt = NULL;
1819 }
1820
1821 return rt;
1822}
1823
8c5b83f0 1824static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1825{
5578689a 1826 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1827 struct rt6_info *rt = NULL;
1828 struct net_device *dev = NULL;
1829 struct inet6_dev *idev = NULL;
c71099ac 1830 struct fib6_table *table;
1da177e4 1831 int addr_type;
8c5b83f0 1832 int err = -EINVAL;
1da177e4 1833
86872cb5 1834 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1835 goto out;
1da177e4 1836#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1837 if (cfg->fc_src_len)
8c5b83f0 1838 goto out;
1da177e4 1839#endif
86872cb5 1840 if (cfg->fc_ifindex) {
1da177e4 1841 err = -ENODEV;
5578689a 1842 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1843 if (!dev)
1844 goto out;
1845 idev = in6_dev_get(dev);
1846 if (!idev)
1847 goto out;
1848 }
1849
86872cb5
TG		 1850 if (cfg->fc_metric == 0)
1851 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1852
d71314b4 1853 err = -ENOBUFS;
38308473
DM		 1854 if (cfg->fc_nlinfo.nlh &&
1855 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1856 table = fib6_get_table(net, cfg->fc_table);
38308473 1857 if (!table) {
f3213831 1858 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1859 table = fib6_new_table(net, cfg->fc_table);
1860 }
1861 } else {
1862 table = fib6_new_table(net, cfg->fc_table);
1863 }
38308473
DM		 1864
1865 if (!table)
c71099ac 1866 goto out;
c71099ac 1867
ad706862
MKL		 1868 rt = ip6_dst_alloc(net, NULL,
1869 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1870
38308473 1871 if (!rt) {
1da177e4
LT		 1872 err = -ENOMEM;
1873 goto out;
1874 }
1875
1716a961
G		 1876 if (cfg->fc_flags & RTF_EXPIRES)
1877 rt6_set_expires(rt, jiffies +
1878 clock_t_to_jiffies(cfg->fc_expires));
1879 else
1880 rt6_clean_expires(rt);
1da177e4 1881
86872cb5
TG		 1882 if (cfg->fc_protocol == RTPROT_UNSPEC)
1883 cfg->fc_protocol = RTPROT_BOOT;
1884 rt->rt6i_protocol = cfg->fc_protocol;
1885
1886 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1887
1888 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1889 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1890 else if (cfg->fc_flags & RTF_LOCAL)
1891 rt->dst.input = ip6_input;
1da177e4 1892 else
d8d1f30b 1893 rt->dst.input = ip6_forward;
1da177e4 1894
d8d1f30b 1895 rt->dst.output = ip6_output;
1da177e4 1896
19e42e45
RP		 1897 if (cfg->fc_encap) {
1898 struct lwtunnel_state *lwtstate;
1899
1900 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1901 cfg->fc_encap, AF_INET6, cfg,
1902 &lwtstate);
19e42e45
RP		 1903 if (err)
1904 goto out;
61adedf3
JB		 1905 rt->dst.lwtstate = lwtstate_get(lwtstate);
1906 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1907 rt->dst.lwtstate->orig_output = rt->dst.output;
1908 rt->dst.output = lwtunnel_output;
25368623 1909 }
61adedf3
JB		 1910 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1911 rt->dst.lwtstate->orig_input = rt->dst.input;
1912 rt->dst.input = lwtunnel_input;
25368623 1913 }
19e42e45
RP		 1914 }
1915
86872cb5
TG		 1916 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1917 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1918 if (rt->rt6i_dst.plen == 128)
e5fd387a 1919 rt->dst.flags |= DST_HOST;
e5fd387a 1920
1da177e4 1921#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1922 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1923 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1924#endif
1925
86872cb5 1926 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1927
1928 /* We cannot add true routes via loopback here,
1929 they would result in kernel looping; promote them to reject routes
1930 */
86872cb5 1931 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1932 (dev && (dev->flags & IFF_LOOPBACK) &&
1933 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1934 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1935 /* hold loopback dev/idev if we haven't done so. */
5578689a 1936 if (dev != net->loopback_dev) {
1da177e4
LT		 1937 if (dev) {
1938 dev_put(dev);
1939 in6_dev_put(idev);
1940 }
5578689a 1941 dev = net->loopback_dev;
1da177e4
LT		 1942 dev_hold(dev);
1943 idev = in6_dev_get(dev);
1944 if (!idev) {
1945 err = -ENODEV;
1946 goto out;
1947 }
1948 }
1da177e4 1949 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1950 switch (cfg->fc_type) {
1951 case RTN_BLACKHOLE:
1952 rt->dst.error = -EINVAL;
ede2059d 1953 rt->dst.output = dst_discard_out;
7150aede 1954 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1955 break;
1956 case RTN_PROHIBIT:
1957 rt->dst.error = -EACCES;
7150aede
K		 1958 rt->dst.output = ip6_pkt_prohibit_out;
1959 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1960 break;
b4949ab2 1961 case RTN_THROW:
0315e382 1962 case RTN_UNREACHABLE:
ef2c7d7b 1963 default:
7150aede 1964 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1965 : (cfg->fc_type == RTN_UNREACHABLE)
1966 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1967 rt->dst.output = ip6_pkt_discard_out;
1968 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1969 break;
1970 }
1da177e4
LT		 1971 goto install_route;
1972 }
1973
86872cb5 1974 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1975 const struct in6_addr *gw_addr;
1da177e4
LT		 1976 int gwa_type;
1977
86872cb5 1978 gw_addr = &cfg->fc_gateway;
330567b7 1979 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1980
1981 /* if gw_addr is local we will fail to detect this in case
1982 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1983 * will return already-added prefix route via interface that
1984 * prefix route was assigned to, which might be non-loopback.
1985 */
1986 err = -EINVAL;
330567b7
FW		 1987 if (ipv6_chk_addr_and_flags(net, gw_addr,
1988 gwa_type & IPV6_ADDR_LINKLOCAL ?
1989 dev : NULL, 0, 0))
48ed7b26
FW		 1990 goto out;
1991
4e3fd7a0 1992 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1993
1994 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
8c14586f 1995 struct rt6_info *grt = NULL;
1da177e4
LT		 1996
1997 /* IPv6 strictly inhibits using not link-local
1998 addresses as nexthop address.
1999 Otherwise, router will not able to send redirects.
2000 It is very good, but in some (rare!) circumstances
2001 (SIT, PtP, NBMA NOARP links) it is handy to allow
2002 some exceptions. --ANK
96d5822c
EN		 2003 We allow IPv4-mapped nexthops to support RFC4798-type
2004 addressing
1da177e4 2005 */
96d5822c
EN		 2006 if (!(gwa_type & (IPV6_ADDR_UNICAST |
2007 IPV6_ADDR_MAPPED)))
1da177e4
LT		 2008 goto out;
2009
a435a07f 2010 if (cfg->fc_table) {
8c14586f
DA		 2011 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
2012
a435a07f
VB		 2013 if (grt) {
2014 if (grt->rt6i_flags & RTF_GATEWAY ||
2015 (dev && dev != grt->dst.dev)) {
2016 ip6_rt_put(grt);
2017 grt = NULL;
2018 }
2019 }
2020 }
2021
8c14586f
DA		 2022 if (!grt)
2023 grt = rt6_lookup(net, gw_addr, NULL,
2024 cfg->fc_ifindex, 1);
1da177e4
LT		 2025
2026 err = -EHOSTUNREACH;
38308473 2027 if (!grt)
1da177e4
LT		 2028 goto out;
2029 if (dev) {
d1918542 2030 if (dev != grt->dst.dev) {
94e187c0 2031 ip6_rt_put(grt);
1da177e4
LT		 2032 goto out;
2033 }
2034 } else {
d1918542 2035 dev = grt->dst.dev;
1da177e4
LT		 2036 idev = grt->rt6i_idev;
2037 dev_hold(dev);
2038 in6_dev_hold(grt->rt6i_idev);
2039 }
38308473 2040 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 2041 err = 0;
94e187c0 2042 ip6_rt_put(grt);
1da177e4
LT		 2043
2044 if (err)
2045 goto out;
2046 }
2047 err = -EINVAL;
38308473 2048 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2049 goto out;
2050 }
2051
2052 err = -ENODEV;
38308473 2053 if (!dev)
1da177e4
LT		 2054 goto out;
2055
c3968a85
DW		 2056 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2057 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2058 err = -EINVAL;
2059 goto out;
2060 }
4e3fd7a0 2061 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 2062 rt->rt6i_prefsrc.plen = 128;
2063 } else
2064 rt->rt6i_prefsrc.plen = 0;
2065
86872cb5 2066 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2067
2068install_route:
d8d1f30b 2069 rt->dst.dev = dev;
1da177e4 2070 rt->rt6i_idev = idev;
c71099ac 2071 rt->rt6i_table = table;
63152fc0 2072
c346dca1 2073 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2074
8c5b83f0 2075 return rt;
6b9ea5a6
RP		 2076out:
2077 if (dev)
2078 dev_put(dev);
2079 if (idev)
2080 in6_dev_put(idev);
2081 if (rt)
2082 dst_free(&rt->dst);
2083
8c5b83f0 2084 return ERR_PTR(err);
6b9ea5a6
RP		 2085}
2086
2087int ip6_route_add(struct fib6_config *cfg)
2088{
2089 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2090 struct rt6_info *rt;
6b9ea5a6
RP		 2091 int err;
2092
8c5b83f0
RP		 2093 rt = ip6_route_info_create(cfg);
2094 if (IS_ERR(rt)) {
2095 err = PTR_ERR(rt);
2096 rt = NULL;
6b9ea5a6 2097 goto out;
8c5b83f0 2098 }
6b9ea5a6 2099
e715b6d3
FW		 2100 err = ip6_convert_metrics(&mxc, cfg);
2101 if (err)
2102 goto out;
1da177e4 2103
e715b6d3
FW		 2104 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2105
2106 kfree(mxc.mx);
6b9ea5a6 2107
e715b6d3 2108 return err;
1da177e4 2109out:
1da177e4 2110 if (rt)
d8d1f30b 2111 dst_free(&rt->dst);
6b9ea5a6 2112
1da177e4
LT		 2113 return err;
2114}
2115
86872cb5 2116static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2117{
2118 int err;
c71099ac 2119 struct fib6_table *table;
d1918542 2120 struct net *net = dev_net(rt->dst.dev);
1da177e4 2121
8e3d5be7
MKL		 2122 if (rt == net->ipv6.ip6_null_entry ||
2123 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2124 err = -ENOENT;
2125 goto out;
2126 }
6c813a72 2127
c71099ac
TG		 2128 table = rt->rt6i_table;
2129 write_lock_bh(&table->tb6_lock);
86872cb5 2130 err = fib6_del(rt, info);
c71099ac 2131 write_unlock_bh(&table->tb6_lock);
1da177e4 2132
6825a26c 2133out:
94e187c0 2134 ip6_rt_put(rt);
1da177e4
LT		 2135 return err;
2136}
2137
e0a1ad73
TG		 2138int ip6_del_rt(struct rt6_info *rt)
2139{
4d1169c1 2140 struct nl_info info = {
d1918542 2141 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2142 };
528c4ceb 2143 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2144}
2145
86872cb5 2146static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2147{
c71099ac 2148 struct fib6_table *table;
1da177e4
LT		 2149 struct fib6_node *fn;
2150 struct rt6_info *rt;
2151 int err = -ESRCH;
2152
5578689a 2153 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2154 if (!table)
c71099ac
TG		 2155 return err;
2156
2157 read_lock_bh(&table->tb6_lock);
1da177e4 2158
c71099ac 2159 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2160 &cfg->fc_dst, cfg->fc_dst_len,
2161 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2162
1da177e4 2163 if (fn) {
d8d1f30b 2164 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2165 if ((rt->rt6i_flags & RTF_CACHE) &&
2166 !(cfg->fc_flags & RTF_CACHE))
2167 continue;
86872cb5 2168 if (cfg->fc_ifindex &&
d1918542
DM		 2169 (!rt->dst.dev ||
2170 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2171 continue;
86872cb5
TG		 2172 if (cfg->fc_flags & RTF_GATEWAY &&
2173 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2174 continue;
86872cb5 2175 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2176 continue;
d8d1f30b 2177 dst_hold(&rt->dst);
c71099ac 2178 read_unlock_bh(&table->tb6_lock);
1da177e4 2179
86872cb5 2180 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2181 }
2182 }
c71099ac 2183 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2184
2185 return err;
2186}
2187
6700c270 2188static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2189{
a6279458 2190 struct netevent_redirect netevent;
e8599ff4 2191 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2192 struct ndisc_options ndopts;
2193 struct inet6_dev *in6_dev;
2194 struct neighbour *neigh;
71bcdba0 2195 struct rd_msg *msg;
6e157b6a
DM		 2196 int optlen, on_link;
2197 u8 *lladdr;
e8599ff4 2198
29a3cad5 2199 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2200 optlen -= sizeof(*msg);
e8599ff4
DM		 2201
2202 if (optlen < 0) {
6e157b6a 2203 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2204 return;
2205 }
2206
71bcdba0 2207 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2208
71bcdba0 2209 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2210 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2211 return;
2212 }
2213
6e157b6a 2214 on_link = 0;
71bcdba0 2215 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2216 on_link = 1;
71bcdba0 2217 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2218 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2219 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2220 return;
2221 }
2222
2223 in6_dev = __in6_dev_get(skb->dev);
2224 if (!in6_dev)
2225 return;
2226 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2227 return;
2228
2229 /* RFC2461 8.1:
2230 * The IP source address of the Redirect MUST be the same as the current
2231 * first-hop router for the specified ICMP Destination Address.
2232 */
2233
f997c55c 2234 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2235 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2236 return;
2237 }
6e157b6a
DM		 2238
2239 lladdr = NULL;
e8599ff4
DM		 2240 if (ndopts.nd_opts_tgt_lladdr) {
2241 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2242 skb->dev);
2243 if (!lladdr) {
2244 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2245 return;
2246 }
2247 }
2248
6e157b6a 2249 rt = (struct rt6_info *) dst;
ec13ad1d 2250 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2251 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2252 return;
6e157b6a 2253 }
e8599ff4 2254
6e157b6a
DM		 2255 /* Redirect received -> path was valid.
2256 * Look, redirects are sent only in response to data packets,
2257 * so that this nexthop apparently is reachable. --ANK
2258 */
2259 dst_confirm(&rt->dst);
a6279458 2260
71bcdba0 2261 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2262 if (!neigh)
2263 return;
a6279458 2264
1da177e4
LT		 2265 /*
2266 * We have finally decided to accept it.
2267 */
2268
f997c55c 2269 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 2270 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2271 NEIGH_UPDATE_F_OVERRIDE|
2272 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 2273 NEIGH_UPDATE_F_ISROUTER)),
2274 NDISC_REDIRECT, &ndopts);
1da177e4 2275
83a09abd 2276 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2277 if (!nrt)
1da177e4
LT		 2278 goto out;
2279
2280 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2281 if (on_link)
2282 nrt->rt6i_flags &= ~RTF_GATEWAY;
2283
4e3fd7a0 2284 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2285
40e22e8f 2286 if (ip6_ins_rt(nrt))
1da177e4
LT		 2287 goto out;
2288
d8d1f30b
CG		 2289 netevent.old = &rt->dst;
2290 netevent.new = &nrt->dst;
71bcdba0 2291 netevent.daddr = &msg->dest;
60592833 2292 netevent.neigh = neigh;
8d71740c
TT		 2293 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2294
38308473 2295 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2296 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2297 ip6_del_rt(rt);
1da177e4
LT		 2298 }
2299
2300out:
e8599ff4 2301 neigh_release(neigh);
6e157b6a
DM		 2302}
2303
1da177e4
LT		 2304/*
2305 * Misc support functions
2306 */
2307
4b32b5ad
MKL		 2308static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2309{
2310 BUG_ON(from->dst.from);
2311
2312 rt->rt6i_flags &= ~RTF_EXPIRES;
2313 dst_hold(&from->dst);
2314 rt->dst.from = &from->dst;
2315 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2316}
2317
83a09abd
MKL		 2318static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2319{
2320 rt->dst.input = ort->dst.input;
2321 rt->dst.output = ort->dst.output;
2322 rt->rt6i_dst = ort->rt6i_dst;
2323 rt->dst.error = ort->dst.error;
2324 rt->rt6i_idev = ort->rt6i_idev;
2325 if (rt->rt6i_idev)
2326 in6_dev_hold(rt->rt6i_idev);
2327 rt->dst.lastuse = jiffies;
2328 rt->rt6i_gateway = ort->rt6i_gateway;
2329 rt->rt6i_flags = ort->rt6i_flags;
2330 rt6_set_from(rt, ort);
2331 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2332#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2333 rt->rt6i_src = ort->rt6i_src;
1da177e4 2334#endif
83a09abd
MKL		 2335 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2336 rt->rt6i_table = ort->rt6i_table;
61adedf3 2337 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2338}
2339
70ceb4f5 2340#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2341static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42 2342 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 2343 const struct in6_addr *gwaddr,
2344 struct net_device *dev)
70ceb4f5 2345{
830218c1
DA		 2346 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
2347 int ifindex = dev->ifindex;
70ceb4f5
YH		 2348 struct fib6_node *fn;
2349 struct rt6_info *rt = NULL;
c71099ac
TG		 2350 struct fib6_table *table;
2351
830218c1 2352 table = fib6_get_table(net, tb_id);
38308473 2353 if (!table)
c71099ac 2354 return NULL;
70ceb4f5 2355
5744dd9b 2356 read_lock_bh(&table->tb6_lock);
67ba4152 2357 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2358 if (!fn)
2359 goto out;
2360
d8d1f30b 2361 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2362 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2363 continue;
2364 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2365 continue;
2366 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2367 continue;
d8d1f30b 2368 dst_hold(&rt->dst);
70ceb4f5
YH		 2369 break;
2370 }
2371out:
5744dd9b 2372 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2373 return rt;
2374}
2375
efa2cea0 2376static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42 2377 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 2378 const struct in6_addr *gwaddr,
2379 struct net_device *dev,
95c96174 2380 unsigned int pref)
70ceb4f5 2381{
86872cb5 2382 struct fib6_config cfg = {
238fc7ea 2383 .fc_metric = IP6_RT_PRIO_USER,
830218c1 2384 .fc_ifindex = dev->ifindex,
86872cb5
TG		 2385 .fc_dst_len = prefixlen,
2386 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2387 RTF_UP | RTF_PREF(pref),
15e47304 2388 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2389 .fc_nlinfo.nlh = NULL,
2390 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2391 };
2392
830218c1 2393 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
4e3fd7a0
AD		 2394 cfg.fc_dst = *prefix;
2395 cfg.fc_gateway = *gwaddr;
70ceb4f5 2396
e317da96
YH		 2397 /* We should treat it as a default route if prefix length is 0. */
2398 if (!prefixlen)
86872cb5 2399 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2400
86872cb5 2401 ip6_route_add(&cfg);
70ceb4f5 2402
830218c1 2403 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
70ceb4f5
YH		 2404}
2405#endif
2406
b71d1d42 2407struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2408{
830218c1 2409 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
1da177e4 2410 struct rt6_info *rt;
c71099ac 2411 struct fib6_table *table;
1da177e4 2412
830218c1 2413 table = fib6_get_table(dev_net(dev), tb_id);
38308473 2414 if (!table)
c71099ac 2415 return NULL;
1da177e4 2416
5744dd9b 2417 read_lock_bh(&table->tb6_lock);
67ba4152 2418 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2419 if (dev == rt->dst.dev &&
045927ff 2420 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2421 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2422 break;
2423 }
2424 if (rt)
d8d1f30b 2425 dst_hold(&rt->dst);
5744dd9b 2426 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2427 return rt;
2428}
2429
b71d1d42 2430struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2431 struct net_device *dev,
2432 unsigned int pref)
1da177e4 2433{
86872cb5 2434 struct fib6_config cfg = {
ca254490 2435 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2436 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2437 .fc_ifindex = dev->ifindex,
2438 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2439 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2440 .fc_nlinfo.portid = 0,
5578689a 2441 .fc_nlinfo.nlh = NULL,
c346dca1 2442 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2443 };
1da177e4 2444
4e3fd7a0 2445 cfg.fc_gateway = *gwaddr;
1da177e4 2446
830218c1
DA		 2447 if (!ip6_route_add(&cfg)) {
2448 struct fib6_table *table;
2449
2450 table = fib6_get_table(dev_net(dev), cfg.fc_table);
2451 if (table)
2452 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
2453 }
1da177e4 2454
1da177e4
LT		 2455 return rt6_get_dflt_router(gwaddr, dev);
2456}
2457
830218c1 2458static void __rt6_purge_dflt_routers(struct fib6_table *table)
1da177e4
LT		 2459{
2460 struct rt6_info *rt;
2461
2462restart:
c71099ac 2463 read_lock_bh(&table->tb6_lock);
d8d1f30b 2464 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2465 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2466 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2467 dst_hold(&rt->dst);
c71099ac 2468 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2469 ip6_del_rt(rt);
1da177e4
LT		 2470 goto restart;
2471 }
2472 }
c71099ac 2473 read_unlock_bh(&table->tb6_lock);
830218c1
DA		 2474
2475 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
2476}
2477
2478void rt6_purge_dflt_routers(struct net *net)
2479{
2480 struct fib6_table *table;
2481 struct hlist_head *head;
2482 unsigned int h;
2483
2484 rcu_read_lock();
2485
2486 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
2487 head = &net->ipv6.fib_table_hash[h];
2488 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
2489 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
2490 __rt6_purge_dflt_routers(table);
2491 }
2492 }
2493
2494 rcu_read_unlock();
1da177e4
LT		 2495}
2496
5578689a
DL		 2497static void rtmsg_to_fib6_config(struct net *net,
2498 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2499 struct fib6_config *cfg)
2500{
2501 memset(cfg, 0, sizeof(*cfg));
2502
ca254490
DA		 2503 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2504 : RT6_TABLE_MAIN;
86872cb5
TG		 2505 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2506 cfg->fc_metric = rtmsg->rtmsg_metric;
2507 cfg->fc_expires = rtmsg->rtmsg_info;
2508 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2509 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2510 cfg->fc_flags = rtmsg->rtmsg_flags;
2511
5578689a 2512 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2513
4e3fd7a0
AD		 2514 cfg->fc_dst = rtmsg->rtmsg_dst;
2515 cfg->fc_src = rtmsg->rtmsg_src;
2516 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2517}
2518
5578689a 2519int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2520{
86872cb5 2521 struct fib6_config cfg;
1da177e4
LT		 2522 struct in6_rtmsg rtmsg;
2523 int err;
2524
67ba4152 2525 switch (cmd) {
1da177e4
LT		 2526 case SIOCADDRT: /* Add a route */
2527 case SIOCDELRT: /* Delete a route */
af31f412 2528 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2529 return -EPERM;
2530 err = copy_from_user(&rtmsg, arg,
2531 sizeof(struct in6_rtmsg));
2532 if (err)
2533 return -EFAULT;
86872cb5 2534
5578689a 2535 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2536
1da177e4
LT		 2537 rtnl_lock();
2538 switch (cmd) {
2539 case SIOCADDRT:
86872cb5 2540 err = ip6_route_add(&cfg);
1da177e4
LT		 2541 break;
2542 case SIOCDELRT:
86872cb5 2543 err = ip6_route_del(&cfg);
1da177e4
LT		 2544 break;
2545 default:
2546 err = -EINVAL;
2547 }
2548 rtnl_unlock();
2549
2550 return err;
3ff50b79 2551 }
1da177e4
LT		 2552
2553 return -EINVAL;
2554}
2555
2556/*
2557 * Drop the packet on the floor
2558 */
2559
d5fdd6ba 2560static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2561{
612f09e8 2562 int type;
adf30907 2563 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2564 switch (ipstats_mib_noroutes) {
2565 case IPSTATS_MIB_INNOROUTES:
0660e03f 2566 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2567 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2568 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2569 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2570 break;
2571 }
2572 /* FALLTHROUGH */
2573 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2574 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2575 ipstats_mib_noroutes);
612f09e8
YH		 2576 break;
2577 }
3ffe533c 2578 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2579 kfree_skb(skb);
2580 return 0;
2581}
2582
9ce8ade0
TG		 2583static int ip6_pkt_discard(struct sk_buff *skb)
2584{
612f09e8 2585 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2586}
2587
ede2059d 2588static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2589{
adf30907 2590 skb->dev = skb_dst(skb)->dev;
612f09e8 2591 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2592}
2593
9ce8ade0
TG		 2594static int ip6_pkt_prohibit(struct sk_buff *skb)
2595{
612f09e8 2596 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2597}
2598
ede2059d 2599static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2600{
adf30907 2601 skb->dev = skb_dst(skb)->dev;
612f09e8 2602 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2603}
2604
1da177e4
LT		 2605/*
2606 * Allocate a dst for local (unicast / anycast) address.
2607 */
2608
2609struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2610 const struct in6_addr *addr,
8f031519 2611 bool anycast)
1da177e4 2612{
ca254490 2613 u32 tb_id;
c346dca1 2614 struct net *net = dev_net(idev->dev);
5f02ce24
DA		 2615 struct net_device *dev = net->loopback_dev;
2616 struct rt6_info *rt;
2617
2618 /* use L3 Master device as loopback for host routes if device
2619 * is enslaved and address is not link local or multicast
2620 */
2621 if (!rt6_need_strict(addr))
2622 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2623
2624 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
a3300ef4 2625 if (!rt)
1da177e4
LT		 2626 return ERR_PTR(-ENOMEM);
2627
1da177e4
LT		 2628 in6_dev_hold(idev);
2629
11d53b49 2630 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2631 rt->dst.input = ip6_input;
2632 rt->dst.output = ip6_output;
1da177e4 2633 rt->rt6i_idev = idev;
1da177e4
LT		 2634
2635 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2636 if (anycast)
2637 rt->rt6i_flags |= RTF_ANYCAST;
2638 else
1da177e4 2639 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2640
550bab42 2641 rt->rt6i_gateway = *addr;
4e3fd7a0 2642 rt->rt6i_dst.addr = *addr;
1da177e4 2643 rt->rt6i_dst.plen = 128;
ca254490
DA		 2644 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2645 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2646 rt->dst.flags |= DST_NOCACHE;
1da177e4 2647
d8d1f30b 2648 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2649
2650 return rt;
2651}
2652
c3968a85
DW		 2653/* remove deleted ip from prefsrc entries */
2654struct arg_dev_net_ip {
2655 struct net_device *dev;
2656 struct net *net;
2657 struct in6_addr *addr;
2658};
2659
2660static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2661{
2662 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2663 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2664 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2665
d1918542 2666 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2667 rt != net->ipv6.ip6_null_entry &&
2668 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2669 /* remove prefsrc entry */
2670 rt->rt6i_prefsrc.plen = 0;
2671 }
2672 return 0;
2673}
2674
2675void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2676{
2677 struct net *net = dev_net(ifp->idev->dev);
2678 struct arg_dev_net_ip adni = {
2679 .dev = ifp->idev->dev,
2680 .net = net,
2681 .addr = &ifp->addr,
2682 };
0c3584d5 2683 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2684}
2685
be7a010d
DJ		 2686#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2687#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2688
2689/* Remove routers and update dst entries when gateway turn into host. */
2690static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2691{
2692 struct in6_addr *gateway = (struct in6_addr *)arg;
2693
2694 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2695 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2696 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2697 return -1;
2698 }
2699 return 0;
2700}
2701
2702void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2703{
2704 fib6_clean_all(net, fib6_clean_tohost, gateway);
2705}
2706
8ed67789
DL		 2707struct arg_dev_net {
2708 struct net_device *dev;
2709 struct net *net;
2710};
2711
1da177e4
LT		 2712static int fib6_ifdown(struct rt6_info *rt, void *arg)
2713{
bc3ef660 2714 const struct arg_dev_net *adn = arg;
2715 const struct net_device *dev = adn->dev;
8ed67789 2716
d1918542 2717 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2718 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2719 return -1;
c159d30c 2720
1da177e4
LT		 2721 return 0;
2722}
2723
f3db4851 2724void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2725{
8ed67789
DL		 2726 struct arg_dev_net adn = {
2727 .dev = dev,
2728 .net = net,
2729 };
2730
0c3584d5 2731 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2732 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2733 if (dev)
2734 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2735}
2736
95c96174 2737struct rt6_mtu_change_arg {
1da177e4 2738 struct net_device *dev;
95c96174 2739 unsigned int mtu;
1da177e4
LT		 2740};
2741
2742static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2743{
2744 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2745 struct inet6_dev *idev;
2746
2747 /* In IPv6 pmtu discovery is not optional,
2748 so that RTAX_MTU lock cannot disable it.
2749 We still use this lock to block changes
2750 caused by addrconf/ndisc.
2751 */
2752
2753 idev = __in6_dev_get(arg->dev);
38308473 2754 if (!idev)
1da177e4
LT		 2755 return 0;
2756
2757 /* For administrative MTU increase, there is no way to discover
2758 IPv6 PMTU increase, so PMTU increase should be updated here.
2759 Since RFC 1981 doesn't include administrative MTU increase
2760 update PMTU increase is a MUST. (i.e. jumbo frame)
2761 */
2762 /*
2763 If new MTU is less than route PMTU, this new MTU will be the
2764 lowest MTU in the path, update the route PMTU to reflect PMTU
2765 decreases; if new MTU is greater than route PMTU, and the
2766 old MTU is the lowest MTU in the path, update the route PMTU
2767 to reflect the increase. In this case if the other nodes' MTU
2768 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2769 PMTU discouvery.
2770 */
d1918542 2771 if (rt->dst.dev == arg->dev &&
fb56be83 2772 dst_metric_raw(&rt->dst, RTAX_MTU) &&
4b32b5ad
MKL		 2773 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2774 if (rt->rt6i_flags & RTF_CACHE) {
2775 /* For RTF_CACHE with rt6i_pmtu == 0
2776 * (i.e. a redirected route),
2777 * the metrics of its rt->dst.from has already
2778 * been updated.
2779 */
2780 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2781 rt->rt6i_pmtu = arg->mtu;
2782 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2783 (dst_mtu(&rt->dst) < arg->mtu &&
2784 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2785 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2786 }
566cfd8f 2787 }
1da177e4
LT		 2788 return 0;
2789}
2790
95c96174 2791void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2792{
c71099ac
TG		 2793 struct rt6_mtu_change_arg arg = {
2794 .dev = dev,
2795 .mtu = mtu,
2796 };
1da177e4 2797
0c3584d5 2798 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2799}
2800
ef7c79ed 2801static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2802 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2803 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2804 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2805 [RTA_PRIORITY] = { .type = NLA_U32 },
2806 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2807 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2808 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2809 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2810 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2811 [RTA_EXPIRES] = { .type = NLA_U32 },
622ec2c9 2812 [RTA_UID] = { .type = NLA_U32 },
86872cb5
TG		 2813};
2814
2815static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2816 struct fib6_config *cfg)
1da177e4 2817{
86872cb5
TG		 2818 struct rtmsg *rtm;
2819 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2820 unsigned int pref;
86872cb5 2821 int err;
1da177e4 2822
86872cb5
TG		 2823 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2824 if (err < 0)
2825 goto errout;
1da177e4 2826
86872cb5
TG		 2827 err = -EINVAL;
2828 rtm = nlmsg_data(nlh);
2829 memset(cfg, 0, sizeof(*cfg));
2830
2831 cfg->fc_table = rtm->rtm_table;
2832 cfg->fc_dst_len = rtm->rtm_dst_len;
2833 cfg->fc_src_len = rtm->rtm_src_len;
2834 cfg->fc_flags = RTF_UP;
2835 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2836 cfg->fc_type = rtm->rtm_type;
86872cb5 2837
ef2c7d7b
ND		 2838 if (rtm->rtm_type == RTN_UNREACHABLE ||
2839 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2840 rtm->rtm_type == RTN_PROHIBIT ||
2841 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2842 cfg->fc_flags |= RTF_REJECT;
2843
ab79ad14
MŻ		 2844 if (rtm->rtm_type == RTN_LOCAL)
2845 cfg->fc_flags |= RTF_LOCAL;
2846
1f56a01f
MKL		 2847 if (rtm->rtm_flags & RTM_F_CLONED)
2848 cfg->fc_flags |= RTF_CACHE;
2849
15e47304 2850 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2851 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2852 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2853
2854 if (tb[RTA_GATEWAY]) {
67b61f6c 2855 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2856 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2857 }
86872cb5
TG		 2858
2859 if (tb[RTA_DST]) {
2860 int plen = (rtm->rtm_dst_len + 7) >> 3;
2861
2862 if (nla_len(tb[RTA_DST]) < plen)
2863 goto errout;
2864
2865 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2866 }
86872cb5
TG		 2867
2868 if (tb[RTA_SRC]) {
2869 int plen = (rtm->rtm_src_len + 7) >> 3;
2870
2871 if (nla_len(tb[RTA_SRC]) < plen)
2872 goto errout;
2873
2874 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2875 }
86872cb5 2876
c3968a85 2877 if (tb[RTA_PREFSRC])
67b61f6c 2878 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2879
86872cb5
TG		 2880 if (tb[RTA_OIF])
2881 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2882
2883 if (tb[RTA_PRIORITY])
2884 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2885
2886 if (tb[RTA_METRICS]) {
2887 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2888 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2889 }
86872cb5
TG		 2890
2891 if (tb[RTA_TABLE])
2892 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2893
51ebd318
ND		 2894 if (tb[RTA_MULTIPATH]) {
2895 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2896 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2897 }
2898
c78ba6d6
LR		 2899 if (tb[RTA_PREF]) {
2900 pref = nla_get_u8(tb[RTA_PREF]);
2901 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2902 pref != ICMPV6_ROUTER_PREF_HIGH)
2903 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2904 cfg->fc_flags |= RTF_PREF(pref);
2905 }
2906
19e42e45
RP		 2907 if (tb[RTA_ENCAP])
2908 cfg->fc_encap = tb[RTA_ENCAP];
2909
2910 if (tb[RTA_ENCAP_TYPE])
2911 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2912
32bc201e
XL		 2913 if (tb[RTA_EXPIRES]) {
2914 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2915
2916 if (addrconf_finite_timeout(timeout)) {
2917 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2918 cfg->fc_flags |= RTF_EXPIRES;
2919 }
2920 }
2921
86872cb5
TG		 2922 err = 0;
2923errout:
2924 return err;
1da177e4
LT		 2925}
2926
6b9ea5a6
RP		 2927struct rt6_nh {
2928 struct rt6_info *rt6_info;
2929 struct fib6_config r_cfg;
2930 struct mx6_config mxc;
2931 struct list_head next;
2932};
2933
2934static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2935{
2936 struct rt6_nh *nh;
2937
2938 list_for_each_entry(nh, rt6_nh_list, next) {
2939 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2940 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2941 nh->r_cfg.fc_ifindex);
2942 }
2943}
2944
2945static int ip6_route_info_append(struct list_head *rt6_nh_list,
2946 struct rt6_info *rt, struct fib6_config *r_cfg)
2947{
2948 struct rt6_nh *nh;
2949 struct rt6_info *rtnh;
2950 int err = -EEXIST;
2951
2952 list_for_each_entry(nh, rt6_nh_list, next) {
2953 /* check if rt6_info already exists */
2954 rtnh = nh->rt6_info;
2955
2956 if (rtnh->dst.dev == rt->dst.dev &&
2957 rtnh->rt6i_idev == rt->rt6i_idev &&
2958 ipv6_addr_equal(&rtnh->rt6i_gateway,
2959 &rt->rt6i_gateway))
2960 return err;
2961 }
2962
2963 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2964 if (!nh)
2965 return -ENOMEM;
2966 nh->rt6_info = rt;
2967 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2968 if (err) {
2969 kfree(nh);
2970 return err;
2971 }
2972 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2973 list_add_tail(&nh->next, rt6_nh_list);
2974
2975 return 0;
2976}
2977
2978static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2979{
2980 struct fib6_config r_cfg;
2981 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2982 struct rt6_info *rt;
2983 struct rt6_nh *err_nh;
2984 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2985 int remaining;
2986 int attrlen;
6b9ea5a6
RP		 2987 int err = 1;
2988 int nhn = 0;
2989 int replace = (cfg->fc_nlinfo.nlh &&
2990 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2991 LIST_HEAD(rt6_nh_list);
51ebd318 2992
35f1b4e9 2993 remaining = cfg->fc_mp_len;
51ebd318 2994 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2995
6b9ea5a6
RP		 2996 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2997 * rt6_info structs per nexthop
2998 */
51ebd318
ND		 2999 while (rtnh_ok(rtnh, remaining)) {
3000 memcpy(&r_cfg, cfg, sizeof(*cfg));
3001 if (rtnh->rtnh_ifindex)
3002 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3003
3004 attrlen = rtnh_attrlen(rtnh);
3005 if (attrlen > 0) {
3006 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3007
3008 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3009 if (nla) {
67b61f6c 3010 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 3011 r_cfg.fc_flags |= RTF_GATEWAY;
3012 }
19e42e45
RP		 3013 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
3014 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
3015 if (nla)
3016 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 3017 }
6b9ea5a6 3018
8c5b83f0
RP		 3019 rt = ip6_route_info_create(&r_cfg);
3020 if (IS_ERR(rt)) {
3021 err = PTR_ERR(rt);
3022 rt = NULL;
6b9ea5a6 3023 goto cleanup;
8c5b83f0 3024 }
6b9ea5a6
RP		 3025
3026 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 3027 if (err) {
6b9ea5a6
RP		 3028 dst_free(&rt->dst);
3029 goto cleanup;
3030 }
3031
3032 rtnh = rtnh_next(rtnh, &remaining);
3033 }
3034
3035 err_nh = NULL;
3036 list_for_each_entry(nh, &rt6_nh_list, next) {
3037 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
3038 /* nh->rt6_info is used or freed at this point, reset to NULL*/
3039 nh->rt6_info = NULL;
3040 if (err) {
3041 if (replace && nhn)
3042 ip6_print_replace_route_err(&rt6_nh_list);
3043 err_nh = nh;
3044 goto add_errout;
51ebd318 3045 }
6b9ea5a6 3046
1a72418b 3047 /* Because each route is added like a single route we remove
27596472
MK		 3048 * these flags after the first nexthop: if there is a collision,
3049 * we have already failed to add the first nexthop:
3050 * fib6_add_rt2node() has rejected it; when replacing, old
3051 * nexthops have been replaced by first new, the rest should
3052 * be added to it.
1a72418b 3053 */
27596472
MK		 3054 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3055 NLM_F_REPLACE);
6b9ea5a6
RP		 3056 nhn++;
3057 }
3058
3059 goto cleanup;
3060
3061add_errout:
3062 /* Delete routes that were already added */
3063 list_for_each_entry(nh, &rt6_nh_list, next) {
3064 if (err_nh == nh)
3065 break;
3066 ip6_route_del(&nh->r_cfg);
3067 }
3068
3069cleanup:
3070 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3071 if (nh->rt6_info)
3072 dst_free(&nh->rt6_info->dst);
52fe51f8 3073 kfree(nh->mxc.mx);
6b9ea5a6
RP		 3074 list_del(&nh->next);
3075 kfree(nh);
3076 }
3077
3078 return err;
3079}
3080
3081static int ip6_route_multipath_del(struct fib6_config *cfg)
3082{
3083 struct fib6_config r_cfg;
3084 struct rtnexthop *rtnh;
3085 int remaining;
3086 int attrlen;
3087 int err = 1, last_err = 0;
3088
3089 remaining = cfg->fc_mp_len;
3090 rtnh = (struct rtnexthop *)cfg->fc_mp;
3091
3092 /* Parse a Multipath Entry */
3093 while (rtnh_ok(rtnh, remaining)) {
3094 memcpy(&r_cfg, cfg, sizeof(*cfg));
3095 if (rtnh->rtnh_ifindex)
3096 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3097
3098 attrlen = rtnh_attrlen(rtnh);
3099 if (attrlen > 0) {
3100 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3101
3102 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3103 if (nla) {
3104 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3105 r_cfg.fc_flags |= RTF_GATEWAY;
3106 }
3107 }
3108 err = ip6_route_del(&r_cfg);
3109 if (err)
3110 last_err = err;
3111
51ebd318
ND		 3112 rtnh = rtnh_next(rtnh, &remaining);
3113 }
3114
3115 return last_err;
3116}
3117
67ba4152 3118static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3119{
86872cb5
TG		 3120 struct fib6_config cfg;
3121 int err;
1da177e4 3122
86872cb5
TG		 3123 err = rtm_to_fib6_config(skb, nlh, &cfg);
3124 if (err < 0)
3125 return err;
3126
51ebd318 3127 if (cfg.fc_mp)
6b9ea5a6 3128 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3129 else
3130 return ip6_route_del(&cfg);
1da177e4
LT		 3131}
3132
67ba4152 3133static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3134{
86872cb5
TG		 3135 struct fib6_config cfg;
3136 int err;
1da177e4 3137
86872cb5
TG		 3138 err = rtm_to_fib6_config(skb, nlh, &cfg);
3139 if (err < 0)
3140 return err;
3141
51ebd318 3142 if (cfg.fc_mp)
6b9ea5a6 3143 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3144 else
3145 return ip6_route_add(&cfg);
1da177e4
LT		 3146}
3147
19e42e45 3148static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3149{
3150 return NLMSG_ALIGN(sizeof(struct rtmsg))
3151 + nla_total_size(16) /* RTA_SRC */
3152 + nla_total_size(16) /* RTA_DST */
3153 + nla_total_size(16) /* RTA_GATEWAY */
3154 + nla_total_size(16) /* RTA_PREFSRC */
3155 + nla_total_size(4) /* RTA_TABLE */
3156 + nla_total_size(4) /* RTA_IIF */
3157 + nla_total_size(4) /* RTA_OIF */
3158 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3159 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3160 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3161 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3162 + nla_total_size(1) /* RTA_PREF */
61adedf3 3163 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3164}
3165
191cd582
BH		 3166static int rt6_fill_node(struct net *net,
3167 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3168 struct in6_addr *dst, struct in6_addr *src,
15e47304 3169 int iif, int type, u32 portid, u32 seq,
7bc570c8 3170 int prefix, int nowait, unsigned int flags)
1da177e4 3171{
4b32b5ad 3172 u32 metrics[RTAX_MAX];
1da177e4 3173 struct rtmsg *rtm;
2d7202bf 3174 struct nlmsghdr *nlh;
e3703b3d 3175 long expires;
9e762a4a 3176 u32 table;
1da177e4
LT		 3177
3178 if (prefix) { /* user wants prefix routes only */
3179 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3180 /* success since this is not a prefix route */
3181 return 1;
3182 }
3183 }
3184
15e47304 3185 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3186 if (!nlh)
26932566 3187 return -EMSGSIZE;
2d7202bf
TG		 3188
3189 rtm = nlmsg_data(nlh);
1da177e4
LT		 3190 rtm->rtm_family = AF_INET6;
3191 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3192 rtm->rtm_src_len = rt->rt6i_src.plen;
3193 rtm->rtm_tos = 0;
c71099ac 3194 if (rt->rt6i_table)
9e762a4a 3195 table = rt->rt6i_table->tb6_id;
c71099ac 3196 else
9e762a4a
PM		 3197 table = RT6_TABLE_UNSPEC;
3198 rtm->rtm_table = table;
c78679e8
DM		 3199 if (nla_put_u32(skb, RTA_TABLE, table))
3200 goto nla_put_failure;
ef2c7d7b
ND		 3201 if (rt->rt6i_flags & RTF_REJECT) {
3202 switch (rt->dst.error) {
3203 case -EINVAL:
3204 rtm->rtm_type = RTN_BLACKHOLE;
3205 break;
3206 case -EACCES:
3207 rtm->rtm_type = RTN_PROHIBIT;
3208 break;
b4949ab2
ND		 3209 case -EAGAIN:
3210 rtm->rtm_type = RTN_THROW;
3211 break;
ef2c7d7b
ND		 3212 default:
3213 rtm->rtm_type = RTN_UNREACHABLE;
3214 break;
3215 }
3216 }
38308473 3217 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3218 rtm->rtm_type = RTN_LOCAL;
d1918542 3219 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3220 rtm->rtm_type = RTN_LOCAL;
3221 else
3222 rtm->rtm_type = RTN_UNICAST;
3223 rtm->rtm_flags = 0;
35103d11 3224 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3225 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3226 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3227 rtm->rtm_flags |= RTNH_F_DEAD;
3228 }
1da177e4
LT		 3229 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3230 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3231 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3232 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3233 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3234 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3235 rtm->rtm_protocol = RTPROT_RA;
3236 else
3237 rtm->rtm_protocol = RTPROT_KERNEL;
3238 }
1da177e4 3239
38308473 3240 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3241 rtm->rtm_flags |= RTM_F_CLONED;
3242
3243 if (dst) {
930345ea 3244 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3245 goto nla_put_failure;
1ab1457c 3246 rtm->rtm_dst_len = 128;
1da177e4 3247 } else if (rtm->rtm_dst_len)
930345ea 3248 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3249 goto nla_put_failure;
1da177e4
LT		 3250#ifdef CONFIG_IPV6_SUBTREES
3251 if (src) {
930345ea 3252 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3253 goto nla_put_failure;
1ab1457c 3254 rtm->rtm_src_len = 128;
c78679e8 3255 } else if (rtm->rtm_src_len &&
930345ea 3256 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3257 goto nla_put_failure;
1da177e4 3258#endif
7bc570c8
YH		 3259 if (iif) {
3260#ifdef CONFIG_IPV6_MROUTE
3261 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2cf75070
NA		 3262 int err = ip6mr_get_route(net, skb, rtm, nowait,
3263 portid);
3264
7bc570c8
YH		 3265 if (err <= 0) {
3266 if (!nowait) {
3267 if (err == 0)
3268 return 0;
3269 goto nla_put_failure;
3270 } else {
3271 if (err == -EMSGSIZE)
3272 goto nla_put_failure;
3273 }
3274 }
3275 } else
3276#endif
c78679e8
DM		 3277 if (nla_put_u32(skb, RTA_IIF, iif))
3278 goto nla_put_failure;
7bc570c8 3279 } else if (dst) {
1da177e4 3280 struct in6_addr saddr_buf;
c78679e8 3281 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3282 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3283 goto nla_put_failure;
1da177e4 3284 }
2d7202bf 3285
c3968a85
DW		 3286 if (rt->rt6i_prefsrc.plen) {
3287 struct in6_addr saddr_buf;
4e3fd7a0 3288 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3289 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3290 goto nla_put_failure;
c3968a85
DW		 3291 }
3292
4b32b5ad
MKL		 3293 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3294 if (rt->rt6i_pmtu)
3295 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3296 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3297 goto nla_put_failure;
3298
dd0cbf29 3299 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3300 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3301 goto nla_put_failure;
94f826b8 3302 }
2d7202bf 3303
c78679e8
DM		 3304 if (rt->dst.dev &&
3305 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3306 goto nla_put_failure;
3307 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3308 goto nla_put_failure;
8253947e
LW		 3309
3310 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3311
87a50699 3312 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3313 goto nla_put_failure;
2d7202bf 3314
c78ba6d6
LR		 3315 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3316 goto nla_put_failure;
3317
61adedf3 3318 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3319
053c095a
JB		 3320 nlmsg_end(skb, nlh);
3321 return 0;
2d7202bf
TG		 3322
3323nla_put_failure:
26932566
PM		 3324 nlmsg_cancel(skb, nlh);
3325 return -EMSGSIZE;
1da177e4
LT		 3326}
3327
1b43af54 3328int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3329{
3330 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3331 int prefix;
3332
2d7202bf
TG		 3333 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3334 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3335 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3336 } else
3337 prefix = 0;
3338
191cd582
BH		 3339 return rt6_fill_node(arg->net,
3340 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3341 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3342 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3343}
3344
67ba4152 3345static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3346{
3b1e0a65 3347 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3348 struct nlattr *tb[RTA_MAX+1];
3349 struct rt6_info *rt;
1da177e4 3350 struct sk_buff *skb;
ab364a6f 3351 struct rtmsg *rtm;
4c9483b2 3352 struct flowi6 fl6;
72331bc0 3353 int err, iif = 0, oif = 0;
1da177e4 3354
ab364a6f
TG		 3355 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3356 if (err < 0)
3357 goto errout;
1da177e4 3358
ab364a6f 3359 err = -EINVAL;
4c9483b2 3360 memset(&fl6, 0, sizeof(fl6));
38b7097b
HFS		 3361 rtm = nlmsg_data(nlh);
3362 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
1da177e4 3363
ab364a6f
TG		 3364 if (tb[RTA_SRC]) {
3365 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3366 goto errout;
3367
4e3fd7a0 3368 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3369 }
3370
3371 if (tb[RTA_DST]) {
3372 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3373 goto errout;
3374
4e3fd7a0 3375 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3376 }
3377
3378 if (tb[RTA_IIF])
3379 iif = nla_get_u32(tb[RTA_IIF]);
3380
3381 if (tb[RTA_OIF])
72331bc0 3382 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3383
2e47b291
LC		 3384 if (tb[RTA_MARK])
3385 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3386
622ec2c9
LC		 3387 if (tb[RTA_UID])
3388 fl6.flowi6_uid = make_kuid(current_user_ns(),
3389 nla_get_u32(tb[RTA_UID]));
3390 else
3391 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3392
1da177e4
LT		 3393 if (iif) {
3394 struct net_device *dev;
72331bc0
SL		 3395 int flags = 0;
3396
5578689a 3397 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3398 if (!dev) {
3399 err = -ENODEV;
ab364a6f 3400 goto errout;
1da177e4 3401 }
72331bc0
SL		 3402
3403 fl6.flowi6_iif = iif;
3404
3405 if (!ipv6_addr_any(&fl6.saddr))
3406 flags |= RT6_LOOKUP_F_HAS_SADDR;
3407
3408 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3409 flags);
3410 } else {
3411 fl6.flowi6_oif = oif;
3412
3413 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3414 }
3415
ab364a6f 3416 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3417 if (!skb) {
94e187c0 3418 ip6_rt_put(rt);
ab364a6f
TG		 3419 err = -ENOBUFS;
3420 goto errout;
3421 }
1da177e4 3422
ab364a6f
TG		 3423 /* Reserve room for dummy headers, this skb can pass
3424 through good chunk of routing engine.
3425 */
459a98ed 3426 skb_reset_mac_header(skb);
ab364a6f 3427 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3428
d8d1f30b 3429 skb_dst_set(skb, &rt->dst);
1da177e4 3430
4c9483b2 3431 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3432 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3433 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3434 if (err < 0) {
ab364a6f
TG		 3435 kfree_skb(skb);
3436 goto errout;
1da177e4
LT		 3437 }
3438
15e47304 3439 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3440errout:
1da177e4 3441 return err;
1da177e4
LT		 3442}
3443
37a1d361
RP		 3444void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3445 unsigned int nlm_flags)
1da177e4
LT		 3446{
3447 struct sk_buff *skb;
5578689a 3448 struct net *net = info->nl_net;
528c4ceb
DL		 3449 u32 seq;
3450 int err;
3451
3452 err = -ENOBUFS;
38308473 3453 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3454
19e42e45 3455 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3456 if (!skb)
21713ebc
TG		 3457 goto errout;
3458
191cd582 3459 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3460 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3461 if (err < 0) {
3462 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3463 WARN_ON(err == -EMSGSIZE);
3464 kfree_skb(skb);
3465 goto errout;
3466 }
15e47304 3467 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3468 info->nlh, gfp_any());
3469 return;
21713ebc
TG		 3470errout:
3471 if (err < 0)
5578689a 3472 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3473}
3474
8ed67789 3475static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3476 unsigned long event, void *ptr)
8ed67789 3477{
351638e7 3478 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3479 struct net *net = dev_net(dev);
8ed67789
DL		 3480
3481 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3482 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3483 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3484#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3485 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3486 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3487 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3488 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3489#endif
3490 }
3491
3492 return NOTIFY_OK;
3493}
3494
1da177e4
LT		 3495/*
3496 * /proc
3497 */
3498
3499#ifdef CONFIG_PROC_FS
3500
33120b30
AD		 3501static const struct file_operations ipv6_route_proc_fops = {
3502 .owner = THIS_MODULE,
3503 .open = ipv6_route_open,
3504 .read = seq_read,
3505 .llseek = seq_lseek,
8d2ca1d7 3506 .release = seq_release_net,
33120b30
AD		 3507};
3508
1da177e4
LT		 3509static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3510{
69ddb805 3511 struct net *net = (struct net *)seq->private;
1da177e4 3512 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3513 net->ipv6.rt6_stats->fib_nodes,
3514 net->ipv6.rt6_stats->fib_route_nodes,
3515 net->ipv6.rt6_stats->fib_rt_alloc,
3516 net->ipv6.rt6_stats->fib_rt_entries,
3517 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3518 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3519 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3520
3521 return 0;
3522}
3523
3524static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3525{
de05c557 3526 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3527}
3528
9a32144e 3529static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3530 .owner = THIS_MODULE,
3531 .open = rt6_stats_seq_open,
3532 .read = seq_read,
3533 .llseek = seq_lseek,
b6fcbdb4 3534 .release = single_release_net,
1da177e4
LT		 3535};
3536#endif /* CONFIG_PROC_FS */
3537
3538#ifdef CONFIG_SYSCTL
3539
1da177e4 3540static
fe2c6338 3541int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3542 void __user *buffer, size_t *lenp, loff_t *ppos)
3543{
c486da34
LAG		 3544 struct net *net;
3545 int delay;
3546 if (!write)
1da177e4 3547 return -EINVAL;
c486da34
LAG		 3548
3549 net = (struct net *)ctl->extra1;
3550 delay = net->ipv6.sysctl.flush_delay;
3551 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3552 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3553 return 0;
1da177e4
LT		 3554}
3555
fe2c6338 3556struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3557 {
1da177e4 3558 .procname = "flush",
4990509f 3559 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3560 .maxlen = sizeof(int),
89c8b3a1 3561 .mode = 0200,
6d9f239a 3562 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3563 },
3564 {
1da177e4 3565 .procname = "gc_thresh",
9a7ec3a9 3566 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3567 .maxlen = sizeof(int),
3568 .mode = 0644,
6d9f239a 3569 .proc_handler = proc_dointvec,
1da177e4
LT		 3570 },
3571 {
1da177e4 3572 .procname = "max_size",
4990509f 3573 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3574 .maxlen = sizeof(int),
3575 .mode = 0644,
6d9f239a 3576 .proc_handler = proc_dointvec,
1da177e4
LT		 3577 },
3578 {
1da177e4 3579 .procname = "gc_min_interval",
4990509f 3580 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3581 .maxlen = sizeof(int),
3582 .mode = 0644,
6d9f239a 3583 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3584 },
3585 {
1da177e4 3586 .procname = "gc_timeout",
4990509f 3587 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3588 .maxlen = sizeof(int),
3589 .mode = 0644,
6d9f239a 3590 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3591 },
3592 {
1da177e4 3593 .procname = "gc_interval",
4990509f 3594 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3595 .maxlen = sizeof(int),
3596 .mode = 0644,
6d9f239a 3597 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3598 },
3599 {
1da177e4 3600 .procname = "gc_elasticity",
4990509f 3601 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3602 .maxlen = sizeof(int),
3603 .mode = 0644,
f3d3f616 3604 .proc_handler = proc_dointvec,
1da177e4
LT		 3605 },
3606 {
1da177e4 3607 .procname = "mtu_expires",
4990509f 3608 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3609 .maxlen = sizeof(int),
3610 .mode = 0644,
6d9f239a 3611 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3612 },
3613 {
1da177e4 3614 .procname = "min_adv_mss",
4990509f 3615 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3616 .maxlen = sizeof(int),
3617 .mode = 0644,
f3d3f616 3618 .proc_handler = proc_dointvec,
1da177e4
LT		 3619 },
3620 {
1da177e4 3621 .procname = "gc_min_interval_ms",
4990509f 3622 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3623 .maxlen = sizeof(int),
3624 .mode = 0644,
6d9f239a 3625 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3626 },
f8572d8f 3627 { }
1da177e4
LT		 3628};
3629
2c8c1e72 3630struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3631{
3632 struct ctl_table *table;
3633
3634 table = kmemdup(ipv6_route_table_template,
3635 sizeof(ipv6_route_table_template),
3636 GFP_KERNEL);
5ee09105
YH		 3637
3638 if (table) {
3639 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3640 table[0].extra1 = net;
86393e52 3641 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3642 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3643 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3644 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3645 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3646 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3647 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3648 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3649 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3650
3651 /* Don't export sysctls to unprivileged users */
3652 if (net->user_ns != &init_user_ns)
3653 table[0].procname = NULL;
5ee09105
YH		 3654 }
3655
760f2d01
DL		 3656 return table;
3657}
1da177e4
LT		 3658#endif
3659
2c8c1e72 3660static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3661{
633d424b 3662 int ret = -ENOMEM;
8ed67789 3663
86393e52
AD		 3664 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3665 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3666
fc66f95c
ED		 3667 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3668 goto out_ip6_dst_ops;
3669
8ed67789
DL		 3670 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3671 sizeof(*net->ipv6.ip6_null_entry),
3672 GFP_KERNEL);
3673 if (!net->ipv6.ip6_null_entry)
fc66f95c 3674 goto out_ip6_dst_entries;
d8d1f30b 3675 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3676 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3677 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3678 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3679 ip6_template_metrics, true);
8ed67789
DL		 3680
3681#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3682 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3683 sizeof(*net->ipv6.ip6_prohibit_entry),
3684 GFP_KERNEL);
68fffc67
PZ		 3685 if (!net->ipv6.ip6_prohibit_entry)
3686 goto out_ip6_null_entry;
d8d1f30b 3687 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3688 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3689 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3690 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3691 ip6_template_metrics, true);
8ed67789
DL		 3692
3693 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3694 sizeof(*net->ipv6.ip6_blk_hole_entry),
3695 GFP_KERNEL);
68fffc67
PZ		 3696 if (!net->ipv6.ip6_blk_hole_entry)
3697 goto out_ip6_prohibit_entry;
d8d1f30b 3698 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3699 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3700 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3701 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3702 ip6_template_metrics, true);
8ed67789
DL		 3703#endif
3704
b339a47c
PZ		 3705 net->ipv6.sysctl.flush_delay = 0;
3706 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3707 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3708 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3709 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3710 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3711 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3712 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3713
6891a346
BT		 3714 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3715
8ed67789
DL		 3716 ret = 0;
3717out:
3718 return ret;
f2fc6a54 3719
68fffc67
PZ		 3720#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3721out_ip6_prohibit_entry:
3722 kfree(net->ipv6.ip6_prohibit_entry);
3723out_ip6_null_entry:
3724 kfree(net->ipv6.ip6_null_entry);
3725#endif
fc66f95c
ED		 3726out_ip6_dst_entries:
3727 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3728out_ip6_dst_ops:
f2fc6a54 3729 goto out;
cdb18761
DL		 3730}
3731
2c8c1e72 3732static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3733{
8ed67789
DL		 3734 kfree(net->ipv6.ip6_null_entry);
3735#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3736 kfree(net->ipv6.ip6_prohibit_entry);
3737 kfree(net->ipv6.ip6_blk_hole_entry);
3738#endif
41bb78b4 3739 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3740}
3741
d189634e
TG		 3742static int __net_init ip6_route_net_init_late(struct net *net)
3743{
3744#ifdef CONFIG_PROC_FS
d4beaa66
G		 3745 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3746 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3747#endif
3748 return 0;
3749}
3750
3751static void __net_exit ip6_route_net_exit_late(struct net *net)
3752{
3753#ifdef CONFIG_PROC_FS
ece31ffd
G		 3754 remove_proc_entry("ipv6_route", net->proc_net);
3755 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3756#endif
3757}
3758
cdb18761
DL		 3759static struct pernet_operations ip6_route_net_ops = {
3760 .init = ip6_route_net_init,
3761 .exit = ip6_route_net_exit,
3762};
3763
c3426b47
DM		 3764static int __net_init ipv6_inetpeer_init(struct net *net)
3765{
3766 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3767
3768 if (!bp)
3769 return -ENOMEM;
3770 inet_peer_base_init(bp);
3771 net->ipv6.peers = bp;
3772 return 0;
3773}
3774
3775static void __net_exit ipv6_inetpeer_exit(struct net *net)
3776{
3777 struct inet_peer_base *bp = net->ipv6.peers;
3778
3779 net->ipv6.peers = NULL;
56a6b248 3780 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3781 kfree(bp);
3782}
3783
2b823f72 3784static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3785 .init = ipv6_inetpeer_init,
3786 .exit = ipv6_inetpeer_exit,
3787};
3788
d189634e
TG		 3789static struct pernet_operations ip6_route_net_late_ops = {
3790 .init = ip6_route_net_init_late,
3791 .exit = ip6_route_net_exit_late,
3792};
3793
8ed67789
DL		 3794static struct notifier_block ip6_route_dev_notifier = {
3795 .notifier_call = ip6_route_dev_notify,
3796 .priority = 0,
3797};
3798
433d49c3 3799int __init ip6_route_init(void)
1da177e4 3800{
433d49c3 3801 int ret;
8d0b94af 3802 int cpu;
433d49c3 3803
9a7ec3a9
DL		 3804 ret = -ENOMEM;
3805 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3806 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3807 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3808 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3809 goto out;
14e50e57 3810
fc66f95c 3811 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3812 if (ret)
bdb3289f 3813 goto out_kmem_cache;
bdb3289f 3814
c3426b47
DM		 3815 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3816 if (ret)
e8803b6c 3817 goto out_dst_entries;
2a0c451a 3818
7e52b33b
DM		 3819 ret = register_pernet_subsys(&ip6_route_net_ops);
3820 if (ret)
3821 goto out_register_inetpeer;
c3426b47 3822
5dc121e9
AE		 3823 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3824
8ed67789
DL		 3825 /* Registering of the loopback is done before this portion of code,
3826 * the loopback reference in rt6_info will not be taken, do it
3827 * manually for init_net */
d8d1f30b 3828 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3829 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3830 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3831 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3832 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3833 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3834 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3835 #endif
e8803b6c 3836 ret = fib6_init();
433d49c3 3837 if (ret)
8ed67789 3838 goto out_register_subsys;
433d49c3 3839
433d49c3
DL		 3840 ret = xfrm6_init();
3841 if (ret)
e8803b6c 3842 goto out_fib6_init;
c35b7e72 3843
433d49c3
DL		 3844 ret = fib6_rules_init();
3845 if (ret)
3846 goto xfrm6_init;
7e5449c2 3847
d189634e
TG		 3848 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3849 if (ret)
3850 goto fib6_rules_init;
3851
433d49c3 3852 ret = -ENOBUFS;
c7ac8679
GR		 3853 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3854 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3855 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3856 goto out_register_late_subsys;
c127ea2c 3857
8ed67789 3858 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3859 if (ret)
d189634e 3860 goto out_register_late_subsys;
8ed67789 3861
8d0b94af
MKL		 3862 for_each_possible_cpu(cpu) {
3863 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3864
3865 INIT_LIST_HEAD(&ul->head);
3866 spin_lock_init(&ul->lock);
3867 }
3868
433d49c3
DL		 3869out:
3870 return ret;
3871
d189634e
TG		 3872out_register_late_subsys:
3873 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3874fib6_rules_init:
433d49c3
DL		 3875 fib6_rules_cleanup();
3876xfrm6_init:
433d49c3 3877 xfrm6_fini();
2a0c451a
TG		 3878out_fib6_init:
3879 fib6_gc_cleanup();
8ed67789
DL		 3880out_register_subsys:
3881 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3882out_register_inetpeer:
3883 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3884out_dst_entries:
3885 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3886out_kmem_cache:
f2fc6a54 3887 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3888 goto out;
1da177e4
LT		 3889}
3890
3891void ip6_route_cleanup(void)
3892{
8ed67789 3893 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3894 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3895 fib6_rules_cleanup();
1da177e4 3896 xfrm6_fini();
1da177e4 3897 fib6_gc_cleanup();
c3426b47 3898 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3899 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3900 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3901 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3902}
Linux 6.x block layer and io_uring tree(s)