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bna: check for dma mapping errors
[mirror_ubuntu-artful-kernel.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>
1da177e4
LT		 64
65#include <asm/uaccess.h>
66
67#ifdef CONFIG_SYSCTL
68#include <linux/sysctl.h>
69#endif
70
afc154e9 71enum rt6_nud_state {
7e980569
JB		 72 RT6_NUD_FAIL_HARD = -3,
73 RT6_NUD_FAIL_PROBE = -2,
74 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 75 RT6_NUD_SUCCEED = 1
76};
77
83a09abd 78static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
1da177e4 79static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 80static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 81static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 82static struct dst_entry *ip6_negative_advice(struct dst_entry *);
83static void ip6_dst_destroy(struct dst_entry *);
84static void ip6_dst_ifdown(struct dst_entry *,
85 struct net_device *dev, int how);
569d3645 86static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 87
88static int ip6_pkt_discard(struct sk_buff *skb);
aad88724 89static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
7150aede 90static int ip6_pkt_prohibit(struct sk_buff *skb);
aad88724 91static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
1da177e4 92static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 93static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
94 struct sk_buff *skb, u32 mtu);
95static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb);
4b32b5ad 97static void rt6_dst_from_metrics_check(struct rt6_info *rt);
52bd4c0c 98static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 99
70ceb4f5 100#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 101static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 102 const struct in6_addr *prefix, int prefixlen,
103 const struct in6_addr *gwaddr, int ifindex,
95c96174 104 unsigned int pref);
efa2cea0 105static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 106 const struct in6_addr *prefix, int prefixlen,
107 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 108#endif
109
8d0b94af
MKL		 110struct uncached_list {
111 spinlock_t lock;
112 struct list_head head;
113};
114
115static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
116
117static void rt6_uncached_list_add(struct rt6_info *rt)
118{
119 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
120
121 rt->dst.flags |= DST_NOCACHE;
122 rt->rt6i_uncached_list = ul;
123
124 spin_lock_bh(&ul->lock);
125 list_add_tail(&rt->rt6i_uncached, &ul->head);
126 spin_unlock_bh(&ul->lock);
127}
128
129static void rt6_uncached_list_del(struct rt6_info *rt)
130{
131 if (!list_empty(&rt->rt6i_uncached)) {
132 struct uncached_list *ul = rt->rt6i_uncached_list;
133
134 spin_lock_bh(&ul->lock);
135 list_del(&rt->rt6i_uncached);
136 spin_unlock_bh(&ul->lock);
137 }
138}
139
140static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
141{
142 struct net_device *loopback_dev = net->loopback_dev;
143 int cpu;
144
145 for_each_possible_cpu(cpu) {
146 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
147 struct rt6_info *rt;
148
149 spin_lock_bh(&ul->lock);
150 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
151 struct inet6_dev *rt_idev = rt->rt6i_idev;
152 struct net_device *rt_dev = rt->dst.dev;
153
154 if (rt_idev && (rt_idev->dev == dev || !dev) &&
155 rt_idev->dev != loopback_dev) {
156 rt->rt6i_idev = in6_dev_get(loopback_dev);
157 in6_dev_put(rt_idev);
158 }
159
160 if (rt_dev && (rt_dev == dev || !dev) &&
161 rt_dev != loopback_dev) {
162 rt->dst.dev = loopback_dev;
163 dev_hold(rt->dst.dev);
164 dev_put(rt_dev);
165 }
166 }
167 spin_unlock_bh(&ul->lock);
168 }
169}
170
d52d3997
MKL		 171static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
172{
173 return dst_metrics_write_ptr(rt->dst.from);
174}
175
06582540
DM		 176static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
177{
4b32b5ad 178 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 179
d52d3997
MKL		 180 if (rt->rt6i_flags & RTF_PCPU)
181 return rt6_pcpu_cow_metrics(rt);
182 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 183 return NULL;
184 else
3b471175 185 return dst_cow_metrics_generic(dst, old);
06582540
DM		 186}
187
f894cbf8
DM		 188static inline const void *choose_neigh_daddr(struct rt6_info *rt,
189 struct sk_buff *skb,
190 const void *daddr)
39232973
DM		 191{
192 struct in6_addr *p = &rt->rt6i_gateway;
193
a7563f34 194 if (!ipv6_addr_any(p))
39232973 195 return (const void *) p;
f894cbf8
DM		 196 else if (skb)
197 return &ipv6_hdr(skb)->daddr;
39232973
DM		 198 return daddr;
199}
200
f894cbf8
DM		 201static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
202 struct sk_buff *skb,
203 const void *daddr)
d3aaeb38 204{
39232973
DM		 205 struct rt6_info *rt = (struct rt6_info *) dst;
206 struct neighbour *n;
207
f894cbf8 208 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 209 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 210 if (n)
211 return n;
212 return neigh_create(&nd_tbl, daddr, dst->dev);
213}
214
9a7ec3a9 215static struct dst_ops ip6_dst_ops_template = {
1da177e4 216 .family = AF_INET6,
1da177e4
LT		 217 .gc = ip6_dst_gc,
218 .gc_thresh = 1024,
219 .check = ip6_dst_check,
0dbaee3b 220 .default_advmss = ip6_default_advmss,
ebb762f2 221 .mtu = ip6_mtu,
06582540 222 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 223 .destroy = ip6_dst_destroy,
224 .ifdown = ip6_dst_ifdown,
225 .negative_advice = ip6_negative_advice,
226 .link_failure = ip6_link_failure,
227 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 228 .redirect = rt6_do_redirect,
1ac06e03 229 .local_out = __ip6_local_out,
d3aaeb38 230 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 231};
232
ebb762f2 233static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 234{
618f9bc7
SK		 235 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
236
237 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 238}
239
6700c270
DM		 240static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
241 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 242{
243}
244
6700c270
DM		 245static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
246 struct sk_buff *skb)
b587ee3b
DM		 247{
248}
249
0972ddb2
HB		 250static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
251 unsigned long old)
252{
253 return NULL;
254}
255
14e50e57
DM		 256static struct dst_ops ip6_dst_blackhole_ops = {
257 .family = AF_INET6,
14e50e57
DM		 258 .destroy = ip6_dst_destroy,
259 .check = ip6_dst_check,
ebb762f2 260 .mtu = ip6_blackhole_mtu,
214f45c9 261 .default_advmss = ip6_default_advmss,
14e50e57 262 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 263 .redirect = ip6_rt_blackhole_redirect,
0972ddb2 264 .cow_metrics = ip6_rt_blackhole_cow_metrics,
d3aaeb38 265 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 266};
267
62fa8a84 268static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 269 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 270};
271
fb0af4c7 272static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 273 .dst = {
274 .__refcnt = ATOMIC_INIT(1),
275 .__use = 1,
2c20cbd7 276 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 277 .error = -ENETUNREACH,
d8d1f30b
CG		 278 .input = ip6_pkt_discard,
279 .output = ip6_pkt_discard_out,
1da177e4
LT		 280 },
281 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 282 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 283 .rt6i_metric = ~(u32) 0,
284 .rt6i_ref = ATOMIC_INIT(1),
285};
286
101367c2
TG		 287#ifdef CONFIG_IPV6_MULTIPLE_TABLES
288
fb0af4c7 289static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 290 .dst = {
291 .__refcnt = ATOMIC_INIT(1),
292 .__use = 1,
2c20cbd7 293 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 294 .error = -EACCES,
d8d1f30b
CG		 295 .input = ip6_pkt_prohibit,
296 .output = ip6_pkt_prohibit_out,
101367c2
TG		 297 },
298 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 299 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 300 .rt6i_metric = ~(u32) 0,
301 .rt6i_ref = ATOMIC_INIT(1),
302};
303
fb0af4c7 304static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 305 .dst = {
306 .__refcnt = ATOMIC_INIT(1),
307 .__use = 1,
2c20cbd7 308 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 309 .error = -EINVAL,
d8d1f30b 310 .input = dst_discard,
aad88724 311 .output = dst_discard_sk,
101367c2
TG		 312 },
313 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 314 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 315 .rt6i_metric = ~(u32) 0,
316 .rt6i_ref = ATOMIC_INIT(1),
317};
318
319#endif
320
1da177e4 321/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 322static struct rt6_info *__ip6_dst_alloc(struct net *net,
323 struct net_device *dev,
ad706862 324 int flags)
1da177e4 325{
97bab73f 326 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 327 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 328
97bab73f 329 if (rt) {
8104891b
SK		 330 struct dst_entry *dst = &rt->dst;
331
332 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
51ebd318 333 INIT_LIST_HEAD(&rt->rt6i_siblings);
8d0b94af 334 INIT_LIST_HEAD(&rt->rt6i_uncached);
97bab73f 335 }
cf911662 336 return rt;
1da177e4
LT		 337}
338
d52d3997
MKL		 339static struct rt6_info *ip6_dst_alloc(struct net *net,
340 struct net_device *dev,
ad706862 341 int flags)
d52d3997 342{
ad706862 343 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 344
345 if (rt) {
346 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
347 if (rt->rt6i_pcpu) {
348 int cpu;
349
350 for_each_possible_cpu(cpu) {
351 struct rt6_info **p;
352
353 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
354 /* no one shares rt */
355 *p = NULL;
356 }
357 } else {
358 dst_destroy((struct dst_entry *)rt);
359 return NULL;
360 }
361 }
362
363 return rt;
364}
365
1da177e4
LT		 366static void ip6_dst_destroy(struct dst_entry *dst)
367{
368 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 369 struct dst_entry *from = dst->from;
8d0b94af 370 struct inet6_dev *idev;
1da177e4 371
4b32b5ad 372 dst_destroy_metrics_generic(dst);
87775312 373 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 374 rt6_uncached_list_del(rt);
375
376 idev = rt->rt6i_idev;
38308473 377 if (idev) {
1da177e4
LT		 378 rt->rt6i_idev = NULL;
379 in6_dev_put(idev);
1ab1457c 380 }
1716a961 381
ecd98837
YH		 382 dst->from = NULL;
383 dst_release(from);
b3419363
DM		 384}
385
1da177e4
LT		 386static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
387 int how)
388{
389 struct rt6_info *rt = (struct rt6_info *)dst;
390 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 391 struct net_device *loopback_dev =
c346dca1 392 dev_net(dev)->loopback_dev;
1da177e4 393
97cac082
DM		 394 if (dev != loopback_dev) {
395 if (idev && idev->dev == dev) {
396 struct inet6_dev *loopback_idev =
397 in6_dev_get(loopback_dev);
398 if (loopback_idev) {
399 rt->rt6i_idev = loopback_idev;
400 in6_dev_put(idev);
401 }
402 }
1da177e4
LT		 403 }
404}
405
a50feda5 406static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 407{
1716a961
G		 408 if (rt->rt6i_flags & RTF_EXPIRES) {
409 if (time_after(jiffies, rt->dst.expires))
a50feda5 410 return true;
1716a961 411 } else if (rt->dst.from) {
3fd91fb3 412 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 413 }
a50feda5 414 return false;
1da177e4
LT		 415}
416
51ebd318
ND		 417/* Multipath route selection:
418 * Hash based function using packet header and flowlabel.
419 * Adapted from fib_info_hashfn()
420 */
421static int rt6_info_hash_nhsfn(unsigned int candidate_count,
422 const struct flowi6 *fl6)
423{
424 unsigned int val = fl6->flowi6_proto;
425
c08977bb
YH		 426 val ^= ipv6_addr_hash(&fl6->daddr);
427 val ^= ipv6_addr_hash(&fl6->saddr);
51ebd318
ND		 428
429 /* Work only if this not encapsulated */
430 switch (fl6->flowi6_proto) {
431 case IPPROTO_UDP:
432 case IPPROTO_TCP:
433 case IPPROTO_SCTP:
b3ce5ae1
ND		 434 val ^= (__force u16)fl6->fl6_sport;
435 val ^= (__force u16)fl6->fl6_dport;
51ebd318
ND		 436 break;
437
438 case IPPROTO_ICMPV6:
b3ce5ae1
ND		 439 val ^= (__force u16)fl6->fl6_icmp_type;
440 val ^= (__force u16)fl6->fl6_icmp_code;
51ebd318
ND		 441 break;
442 }
443 /* RFC6438 recommands to use flowlabel */
b3ce5ae1 444 val ^= (__force u32)fl6->flowlabel;
51ebd318
ND		 445
446 /* Perhaps, we need to tune, this function? */
447 val = val ^ (val >> 7) ^ (val >> 12);
448 return val % candidate_count;
449}
450
451static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 452 struct flowi6 *fl6, int oif,
453 int strict)
51ebd318
ND		 454{
455 struct rt6_info *sibling, *next_sibling;
456 int route_choosen;
457
458 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
459 /* Don't change the route, if route_choosen == 0
460 * (siblings does not include ourself)
461 */
462 if (route_choosen)
463 list_for_each_entry_safe(sibling, next_sibling,
464 &match->rt6i_siblings, rt6i_siblings) {
465 route_choosen--;
466 if (route_choosen == 0) {
52bd4c0c
ND		 467 if (rt6_score_route(sibling, oif, strict) < 0)
468 break;
51ebd318
ND		 469 match = sibling;
470 break;
471 }
472 }
473 return match;
474}
475
1da177e4 476/*
c71099ac 477 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 478 */
479
8ed67789
DL		 480static inline struct rt6_info *rt6_device_match(struct net *net,
481 struct rt6_info *rt,
b71d1d42 482 const struct in6_addr *saddr,
1da177e4 483 int oif,
d420895e 484 int flags)
1da177e4
LT		 485{
486 struct rt6_info *local = NULL;
487 struct rt6_info *sprt;
488
dd3abc4e
YH		 489 if (!oif && ipv6_addr_any(saddr))
490 goto out;
491
d8d1f30b 492 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 493 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 494
495 if (oif) {
1da177e4
LT		 496 if (dev->ifindex == oif)
497 return sprt;
498 if (dev->flags & IFF_LOOPBACK) {
38308473 499 if (!sprt->rt6i_idev ||
1da177e4 500 sprt->rt6i_idev->dev->ifindex != oif) {
d420895e 501 if (flags & RT6_LOOKUP_F_IFACE && oif)
1da177e4 502 continue;
1ab1457c 503 if (local && (!oif ||
1da177e4
LT		 504 local->rt6i_idev->dev->ifindex == oif))
505 continue;
506 }
507 local = sprt;
508 }
dd3abc4e
YH		 509 } else {
510 if (ipv6_chk_addr(net, saddr, dev,
511 flags & RT6_LOOKUP_F_IFACE))
512 return sprt;
1da177e4 513 }
dd3abc4e 514 }
1da177e4 515
dd3abc4e 516 if (oif) {
1da177e4
LT		 517 if (local)
518 return local;
519
d420895e 520 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 521 return net->ipv6.ip6_null_entry;
1da177e4 522 }
dd3abc4e 523out:
1da177e4
LT		 524 return rt;
525}
526
27097255 527#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 528struct __rt6_probe_work {
529 struct work_struct work;
530 struct in6_addr target;
531 struct net_device *dev;
532};
533
534static void rt6_probe_deferred(struct work_struct *w)
535{
536 struct in6_addr mcaddr;
537 struct __rt6_probe_work *work =
538 container_of(w, struct __rt6_probe_work, work);
539
540 addrconf_addr_solict_mult(&work->target, &mcaddr);
ab450605 541 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL, NULL);
c2f17e82 542 dev_put(work->dev);
662f5533 543 kfree(work);
c2f17e82
HFS		 544}
545
27097255
YH		 546static void rt6_probe(struct rt6_info *rt)
547{
990edb42 548 struct __rt6_probe_work *work;
f2c31e32 549 struct neighbour *neigh;
27097255
YH		 550 /*
551 * Okay, this does not seem to be appropriate
552 * for now, however, we need to check if it
553 * is really so; aka Router Reachability Probing.
554 *
555 * Router Reachability Probe MUST be rate-limited
556 * to no more than one per minute.
557 */
2152caea 558 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 559 return;
2152caea
YH		 560 rcu_read_lock_bh();
561 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
562 if (neigh) {
8d6c31bf
MKL		 563 if (neigh->nud_state & NUD_VALID)
564 goto out;
565
990edb42 566 work = NULL;
2152caea 567 write_lock(&neigh->lock);
990edb42
MKL		 568 if (!(neigh->nud_state & NUD_VALID) &&
569 time_after(jiffies,
570 neigh->updated +
571 rt->rt6i_idev->cnf.rtr_probe_interval)) {
572 work = kmalloc(sizeof(*work), GFP_ATOMIC);
573 if (work)
574 __neigh_set_probe_once(neigh);
c2f17e82 575 }
2152caea 576 write_unlock(&neigh->lock);
990edb42
MKL		 577 } else {
578 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 579 }
990edb42
MKL		 580
581 if (work) {
582 INIT_WORK(&work->work, rt6_probe_deferred);
583 work->target = rt->rt6i_gateway;
584 dev_hold(rt->dst.dev);
585 work->dev = rt->dst.dev;
586 schedule_work(&work->work);
587 }
588
8d6c31bf 589out:
2152caea 590 rcu_read_unlock_bh();
27097255
YH		 591}
592#else
593static inline void rt6_probe(struct rt6_info *rt)
594{
27097255
YH		 595}
596#endif
597
1da177e4 598/*
554cfb7e 599 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 600 */
b6f99a21 601static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 602{
d1918542 603 struct net_device *dev = rt->dst.dev;
161980f4 604 if (!oif || dev->ifindex == oif)
554cfb7e 605 return 2;
161980f4
DM		 606 if ((dev->flags & IFF_LOOPBACK) &&
607 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
608 return 1;
609 return 0;
554cfb7e 610}
1da177e4 611
afc154e9 612static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 613{
f2c31e32 614 struct neighbour *neigh;
afc154e9 615 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 616
4d0c5911
YH		 617 if (rt->rt6i_flags & RTF_NONEXTHOP ||
618 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 619 return RT6_NUD_SUCCEED;
145a3621
YH		 620
621 rcu_read_lock_bh();
622 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
623 if (neigh) {
624 read_lock(&neigh->lock);
554cfb7e 625 if (neigh->nud_state & NUD_VALID)
afc154e9 626 ret = RT6_NUD_SUCCEED;
398bcbeb 627#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 628 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 629 ret = RT6_NUD_SUCCEED;
7e980569
JB		 630 else
631 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 632#endif
145a3621 633 read_unlock(&neigh->lock);
afc154e9
HFS		 634 } else {
635 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 636 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 637 }
145a3621
YH		 638 rcu_read_unlock_bh();
639
a5a81f0b 640 return ret;
1da177e4
LT		 641}
642
554cfb7e
YH		 643static int rt6_score_route(struct rt6_info *rt, int oif,
644 int strict)
1da177e4 645{
a5a81f0b 646 int m;
1ab1457c 647
4d0c5911 648 m = rt6_check_dev(rt, oif);
77d16f45 649 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 650 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 651#ifdef CONFIG_IPV6_ROUTER_PREF
652 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
653#endif
afc154e9
HFS		 654 if (strict & RT6_LOOKUP_F_REACHABLE) {
655 int n = rt6_check_neigh(rt);
656 if (n < 0)
657 return n;
658 }
554cfb7e
YH		 659 return m;
660}
661
f11e6659 662static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 663 int *mpri, struct rt6_info *match,
664 bool *do_rr)
554cfb7e 665{
f11e6659 666 int m;
afc154e9 667 bool match_do_rr = false;
35103d11
AG		 668 struct inet6_dev *idev = rt->rt6i_idev;
669 struct net_device *dev = rt->dst.dev;
670
671 if (dev && !netif_carrier_ok(dev) &&
672 idev->cnf.ignore_routes_with_linkdown)
673 goto out;
f11e6659
DM		 674
675 if (rt6_check_expired(rt))
676 goto out;
677
678 m = rt6_score_route(rt, oif, strict);
7e980569 679 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 680 match_do_rr = true;
681 m = 0; /* lowest valid score */
7e980569 682 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 683 goto out;
afc154e9
HFS		 684 }
685
686 if (strict & RT6_LOOKUP_F_REACHABLE)
687 rt6_probe(rt);
f11e6659 688
7e980569 689 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 690 if (m > *mpri) {
afc154e9 691 *do_rr = match_do_rr;
f11e6659
DM		 692 *mpri = m;
693 match = rt;
f11e6659 694 }
f11e6659
DM		 695out:
696 return match;
697}
698
699static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
700 struct rt6_info *rr_head,
afc154e9
HFS		 701 u32 metric, int oif, int strict,
702 bool *do_rr)
f11e6659 703{
9fbdcfaf 704 struct rt6_info *rt, *match, *cont;
554cfb7e 705 int mpri = -1;
1da177e4 706
f11e6659 707 match = NULL;
9fbdcfaf
SK		 708 cont = NULL;
709 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
710 if (rt->rt6i_metric != metric) {
711 cont = rt;
712 break;
713 }
714
715 match = find_match(rt, oif, strict, &mpri, match, do_rr);
716 }
717
718 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
719 if (rt->rt6i_metric != metric) {
720 cont = rt;
721 break;
722 }
723
afc154e9 724 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 725 }
726
727 if (match || !cont)
728 return match;
729
730 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 731 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 732
f11e6659
DM		 733 return match;
734}
1da177e4 735
f11e6659
DM		 736static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
737{
738 struct rt6_info *match, *rt0;
8ed67789 739 struct net *net;
afc154e9 740 bool do_rr = false;
1da177e4 741
f11e6659
DM		 742 rt0 = fn->rr_ptr;
743 if (!rt0)
744 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 745
afc154e9
HFS		 746 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
747 &do_rr);
1da177e4 748
afc154e9 749 if (do_rr) {
d8d1f30b 750 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 751
554cfb7e 752 /* no entries matched; do round-robin */
f11e6659
DM		 753 if (!next || next->rt6i_metric != rt0->rt6i_metric)
754 next = fn->leaf;
755
756 if (next != rt0)
757 fn->rr_ptr = next;
1da177e4 758 }
1da177e4 759
d1918542 760 net = dev_net(rt0->dst.dev);
a02cec21 761 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 762}
763
8b9df265
MKL		 764static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
765{
766 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
767}
768
70ceb4f5
YH		 769#ifdef CONFIG_IPV6_ROUTE_INFO
770int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 771 const struct in6_addr *gwaddr)
70ceb4f5 772{
c346dca1 773 struct net *net = dev_net(dev);
70ceb4f5
YH		 774 struct route_info *rinfo = (struct route_info *) opt;
775 struct in6_addr prefix_buf, *prefix;
776 unsigned int pref;
4bed72e4 777 unsigned long lifetime;
70ceb4f5
YH		 778 struct rt6_info *rt;
779
780 if (len < sizeof(struct route_info)) {
781 return -EINVAL;
782 }
783
784 /* Sanity check for prefix_len and length */
785 if (rinfo->length > 3) {
786 return -EINVAL;
787 } else if (rinfo->prefix_len > 128) {
788 return -EINVAL;
789 } else if (rinfo->prefix_len > 64) {
790 if (rinfo->length < 2) {
791 return -EINVAL;
792 }
793 } else if (rinfo->prefix_len > 0) {
794 if (rinfo->length < 1) {
795 return -EINVAL;
796 }
797 }
798
799 pref = rinfo->route_pref;
800 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 801 return -EINVAL;
70ceb4f5 802
4bed72e4 803 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 804
805 if (rinfo->length == 3)
806 prefix = (struct in6_addr *)rinfo->prefix;
807 else {
808 /* this function is safe */
809 ipv6_addr_prefix(&prefix_buf,
810 (struct in6_addr *)rinfo->prefix,
811 rinfo->prefix_len);
812 prefix = &prefix_buf;
813 }
814
f104a567
DJ		 815 if (rinfo->prefix_len == 0)
816 rt = rt6_get_dflt_router(gwaddr, dev);
817 else
818 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
819 gwaddr, dev->ifindex);
70ceb4f5
YH		 820
821 if (rt && !lifetime) {
e0a1ad73 822 ip6_del_rt(rt);
70ceb4f5
YH		 823 rt = NULL;
824 }
825
826 if (!rt && lifetime)
efa2cea0 827 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 828 pref);
829 else if (rt)
830 rt->rt6i_flags = RTF_ROUTEINFO |
831 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
832
833 if (rt) {
1716a961
G		 834 if (!addrconf_finite_timeout(lifetime))
835 rt6_clean_expires(rt);
836 else
837 rt6_set_expires(rt, jiffies + HZ * lifetime);
838
94e187c0 839 ip6_rt_put(rt);
70ceb4f5
YH		 840 }
841 return 0;
842}
843#endif
844
a3c00e46
MKL		 845static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
846 struct in6_addr *saddr)
847{
848 struct fib6_node *pn;
849 while (1) {
850 if (fn->fn_flags & RTN_TL_ROOT)
851 return NULL;
852 pn = fn->parent;
853 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
854 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
855 else
856 fn = pn;
857 if (fn->fn_flags & RTN_RTINFO)
858 return fn;
859 }
860}
c71099ac 861
8ed67789
DL		 862static struct rt6_info *ip6_pol_route_lookup(struct net *net,
863 struct fib6_table *table,
4c9483b2 864 struct flowi6 *fl6, int flags)
1da177e4
LT		 865{
866 struct fib6_node *fn;
867 struct rt6_info *rt;
868
c71099ac 869 read_lock_bh(&table->tb6_lock);
4c9483b2 870 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 871restart:
872 rt = fn->leaf;
4c9483b2 873 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 874 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 875 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 876 if (rt == net->ipv6.ip6_null_entry) {
877 fn = fib6_backtrack(fn, &fl6->saddr);
878 if (fn)
879 goto restart;
880 }
d8d1f30b 881 dst_use(&rt->dst, jiffies);
c71099ac 882 read_unlock_bh(&table->tb6_lock);
c71099ac
TG		 883 return rt;
884
885}
886
67ba4152 887struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 888 int flags)
889{
890 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
891}
892EXPORT_SYMBOL_GPL(ip6_route_lookup);
893
9acd9f3a
YH		 894struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
895 const struct in6_addr *saddr, int oif, int strict)
c71099ac 896{
4c9483b2
DM		 897 struct flowi6 fl6 = {
898 .flowi6_oif = oif,
899 .daddr = *daddr,
c71099ac
TG		 900 };
901 struct dst_entry *dst;
77d16f45 902 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 903
adaa70bb 904 if (saddr) {
4c9483b2 905 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 906 flags |= RT6_LOOKUP_F_HAS_SADDR;
907 }
908
4c9483b2 909 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 910 if (dst->error == 0)
911 return (struct rt6_info *) dst;
912
913 dst_release(dst);
914
1da177e4
LT		 915 return NULL;
916}
7159039a
YH		 917EXPORT_SYMBOL(rt6_lookup);
918
c71099ac 919/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 920 It takes new route entry, the addition fails by any reason the
921 route is freed. In any case, if caller does not hold it, it may
922 be destroyed.
923 */
924
e5fd387a 925static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 926 struct mx6_config *mxc)
1da177e4
LT		 927{
928 int err;
c71099ac 929 struct fib6_table *table;
1da177e4 930
c71099ac
TG		 931 table = rt->rt6i_table;
932 write_lock_bh(&table->tb6_lock);
e715b6d3 933 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 934 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 935
936 return err;
937}
938
40e22e8f
TG		 939int ip6_ins_rt(struct rt6_info *rt)
940{
e715b6d3
FW		 941 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
942 struct mx6_config mxc = { .mx = NULL, };
943
944 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 945}
946
8b9df265
MKL		 947static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
948 const struct in6_addr *daddr,
949 const struct in6_addr *saddr)
1da177e4 950{
1da177e4
LT		 951 struct rt6_info *rt;
952
953 /*
954 * Clone the route.
955 */
956
d52d3997 957 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 958 ort = (struct rt6_info *)ort->dst.from;
1da177e4 959
ad706862 960 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 961
962 if (!rt)
963 return NULL;
964
965 ip6_rt_copy_init(rt, ort);
966 rt->rt6i_flags |= RTF_CACHE;
967 rt->rt6i_metric = 0;
968 rt->dst.flags |= DST_HOST;
969 rt->rt6i_dst.addr = *daddr;
970 rt->rt6i_dst.plen = 128;
1da177e4 971
83a09abd
MKL		 972 if (!rt6_is_gw_or_nonexthop(ort)) {
973 if (ort->rt6i_dst.plen != 128 &&
974 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
975 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 976#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 977 if (rt->rt6i_src.plen && saddr) {
978 rt->rt6i_src.addr = *saddr;
979 rt->rt6i_src.plen = 128;
8b9df265 980 }
83a09abd 981#endif
95a9a5ba 982 }
1da177e4 983
95a9a5ba
YH		 984 return rt;
985}
1da177e4 986
d52d3997
MKL		 987static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
988{
989 struct rt6_info *pcpu_rt;
990
991 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 992 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 993
994 if (!pcpu_rt)
995 return NULL;
996 ip6_rt_copy_init(pcpu_rt, rt);
997 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
998 pcpu_rt->rt6i_flags |= RTF_PCPU;
999 return pcpu_rt;
1000}
1001
1002/* It should be called with read_lock_bh(&tb6_lock) acquired */
1003static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1004{
a73e4195 1005 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 1006
1007 p = this_cpu_ptr(rt->rt6i_pcpu);
1008 pcpu_rt = *p;
1009
a73e4195
MKL		 1010 if (pcpu_rt) {
1011 dst_hold(&pcpu_rt->dst);
1012 rt6_dst_from_metrics_check(pcpu_rt);
1013 }
1014 return pcpu_rt;
1015}
1016
1017static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1018{
9c7370a1 1019 struct fib6_table *table = rt->rt6i_table;
a73e4195 1020 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1021
1022 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1023 if (!pcpu_rt) {
1024 struct net *net = dev_net(rt->dst.dev);
1025
9c7370a1
MKL		 1026 dst_hold(&net->ipv6.ip6_null_entry->dst);
1027 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1028 }
1029
9c7370a1
MKL		 1030 read_lock_bh(&table->tb6_lock);
1031 if (rt->rt6i_pcpu) {
1032 p = this_cpu_ptr(rt->rt6i_pcpu);
1033 prev = cmpxchg(p, NULL, pcpu_rt);
1034 if (prev) {
1035 /* If someone did it before us, return prev instead */
1036 dst_destroy(&pcpu_rt->dst);
1037 pcpu_rt = prev;
1038 }
1039 } else {
1040 /* rt has been removed from the fib6 tree
1041 * before we have a chance to acquire the read_lock.
1042 * In this case, don't brother to create a pcpu rt
1043 * since rt is going away anyway. The next
1044 * dst_check() will trigger a re-lookup.
1045 */
d52d3997 1046 dst_destroy(&pcpu_rt->dst);
9c7370a1 1047 pcpu_rt = rt;
d52d3997 1048 }
d52d3997
MKL		 1049 dst_hold(&pcpu_rt->dst);
1050 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1051 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1052 return pcpu_rt;
1053}
1054
8ed67789 1055static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
4c9483b2 1056 struct flowi6 *fl6, int flags)
1da177e4 1057{
367efcb9 1058 struct fib6_node *fn, *saved_fn;
45e4fd26 1059 struct rt6_info *rt;
c71099ac 1060 int strict = 0;
1da177e4 1061
77d16f45 1062 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1063 if (net->ipv6.devconf_all->forwarding == 0)
1064 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1065
c71099ac 1066 read_lock_bh(&table->tb6_lock);
1da177e4 1067
4c9483b2 1068 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1069 saved_fn = fn;
1da177e4 1070
a3c00e46 1071redo_rt6_select:
367efcb9 1072 rt = rt6_select(fn, oif, strict);
52bd4c0c 1073 if (rt->rt6i_nsiblings)
367efcb9 1074 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1075 if (rt == net->ipv6.ip6_null_entry) {
1076 fn = fib6_backtrack(fn, &fl6->saddr);
1077 if (fn)
1078 goto redo_rt6_select;
367efcb9
MKL		 1079 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1080 /* also consider unreachable route */
1081 strict &= ~RT6_LOOKUP_F_REACHABLE;
1082 fn = saved_fn;
1083 goto redo_rt6_select;
367efcb9 1084 }
a3c00e46
MKL		 1085 }
1086
fb9de91e 1087
3da59bd9 1088 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1089 dst_use(&rt->dst, jiffies);
1090 read_unlock_bh(&table->tb6_lock);
1091
1092 rt6_dst_from_metrics_check(rt);
1093 return rt;
3da59bd9
MKL		 1094 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1095 !(rt->rt6i_flags & RTF_GATEWAY))) {
1096 /* Create a RTF_CACHE clone which will not be
1097 * owned by the fib6 tree. It is for the special case where
1098 * the daddr in the skb during the neighbor look-up is different
1099 * from the fl6->daddr used to look-up route here.
1100 */
1101
1102 struct rt6_info *uncached_rt;
1103
d52d3997
MKL		 1104 dst_use(&rt->dst, jiffies);
1105 read_unlock_bh(&table->tb6_lock);
1106
3da59bd9
MKL		 1107 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1108 dst_release(&rt->dst);
c71099ac 1109
3da59bd9 1110 if (uncached_rt)
8d0b94af 1111 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1112 else
1113 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1114
3da59bd9
MKL		 1115 dst_hold(&uncached_rt->dst);
1116 return uncached_rt;
3da59bd9 1117
d52d3997
MKL		 1118 } else {
1119 /* Get a percpu copy */
1120
1121 struct rt6_info *pcpu_rt;
1122
1123 rt->dst.lastuse = jiffies;
1124 rt->dst.__use++;
1125 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1126
9c7370a1
MKL		 1127 if (pcpu_rt) {
1128 read_unlock_bh(&table->tb6_lock);
1129 } else {
1130 /* We have to do the read_unlock first
1131 * because rt6_make_pcpu_route() may trigger
1132 * ip6_dst_gc() which will take the write_lock.
1133 */
1134 dst_hold(&rt->dst);
1135 read_unlock_bh(&table->tb6_lock);
a73e4195 1136 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1137 dst_release(&rt->dst);
1138 }
d52d3997
MKL		 1139
1140 return pcpu_rt;
9c7370a1 1141
d52d3997 1142 }
1da177e4
LT		 1143}
1144
8ed67789 1145static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1146 struct flowi6 *fl6, int flags)
4acad72d 1147{
4c9483b2 1148 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1149}
1150
72331bc0
SL		 1151static struct dst_entry *ip6_route_input_lookup(struct net *net,
1152 struct net_device *dev,
1153 struct flowi6 *fl6, int flags)
1154{
1155 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1156 flags |= RT6_LOOKUP_F_IFACE;
1157
1158 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1159}
1160
c71099ac
TG		 1161void ip6_route_input(struct sk_buff *skb)
1162{
b71d1d42 1163 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1164 struct net *net = dev_net(skb->dev);
adaa70bb 1165 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1166 struct ip_tunnel_info *tun_info;
4c9483b2
DM		 1167 struct flowi6 fl6 = {
1168 .flowi6_iif = skb->dev->ifindex,
1169 .daddr = iph->daddr,
1170 .saddr = iph->saddr,
6502ca52 1171 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1172 .flowi6_mark = skb->mark,
1173 .flowi6_proto = iph->nexthdr,
c71099ac 1174 };
adaa70bb 1175
904af04d 1176 tun_info = skb_tunnel_info(skb);
46fa062a 1177 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1178 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1179 skb_dst_drop(skb);
72331bc0 1180 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1181}
1182
8ed67789 1183static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1184 struct flowi6 *fl6, int flags)
1da177e4 1185{
4c9483b2 1186 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1187}
1188
67ba4152 1189struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
4c9483b2 1190 struct flowi6 *fl6)
c71099ac
TG		 1191{
1192 int flags = 0;
1193
1fb9489b 1194 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1195
4c9483b2 1196 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
77d16f45 1197 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1198
4c9483b2 1199 if (!ipv6_addr_any(&fl6->saddr))
adaa70bb 1200 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1201 else if (sk)
1202 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1203
4c9483b2 1204 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1205}
7159039a 1206EXPORT_SYMBOL(ip6_route_output);
1da177e4 1207
2774c131 1208struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1209{
5c1e6aa3 1210 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1211 struct dst_entry *new = NULL;
1212
f5b0a874 1213 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1214 if (rt) {
d8d1f30b 1215 new = &rt->dst;
14e50e57 1216
8104891b 1217 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
8104891b 1218
14e50e57 1219 new->__use = 1;
352e512c 1220 new->input = dst_discard;
aad88724 1221 new->output = dst_discard_sk;
14e50e57 1222
21efcfa0
ED		 1223 if (dst_metrics_read_only(&ort->dst))
1224 new->_metrics = ort->dst._metrics;
1225 else
1226 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1227 rt->rt6i_idev = ort->rt6i_idev;
1228 if (rt->rt6i_idev)
1229 in6_dev_hold(rt->rt6i_idev);
14e50e57 1230
4e3fd7a0 1231 rt->rt6i_gateway = ort->rt6i_gateway;
1716a961 1232 rt->rt6i_flags = ort->rt6i_flags;
14e50e57
DM		 1233 rt->rt6i_metric = 0;
1234
1235 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1236#ifdef CONFIG_IPV6_SUBTREES
1237 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1238#endif
1239
1240 dst_free(new);
1241 }
1242
69ead7af
DM		 1243 dst_release(dst_orig);
1244 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1245}
14e50e57 1246
1da177e4
LT		 1247/*
1248 * Destination cache support functions
1249 */
1250
4b32b5ad
MKL		 1251static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1252{
1253 if (rt->dst.from &&
1254 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1255 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1256}
1257
3da59bd9
MKL		 1258static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1259{
1260 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1261 return NULL;
1262
1263 if (rt6_check_expired(rt))
1264 return NULL;
1265
1266 return &rt->dst;
1267}
1268
1269static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1270{
1271 if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1272 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1273 return &rt->dst;
1274 else
1275 return NULL;
1276}
1277
1da177e4
LT		 1278static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1279{
1280 struct rt6_info *rt;
1281
1282 rt = (struct rt6_info *) dst;
1283
6f3118b5
ND		 1284 /* All IPV6 dsts are created with ->obsolete set to the value
1285 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1286 * into this function always.
1287 */
e3bc10bd 1288
4b32b5ad
MKL		 1289 rt6_dst_from_metrics_check(rt);
1290
d52d3997 1291 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
3da59bd9
MKL		 1292 return rt6_dst_from_check(rt, cookie);
1293 else
1294 return rt6_check(rt, cookie);
1da177e4
LT		 1295}
1296
1297static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1298{
1299 struct rt6_info *rt = (struct rt6_info *) dst;
1300
1301 if (rt) {
54c1a859
YH		 1302 if (rt->rt6i_flags & RTF_CACHE) {
1303 if (rt6_check_expired(rt)) {
1304 ip6_del_rt(rt);
1305 dst = NULL;
1306 }
1307 } else {
1da177e4 1308 dst_release(dst);
54c1a859
YH		 1309 dst = NULL;
1310 }
1da177e4 1311 }
54c1a859 1312 return dst;
1da177e4
LT		 1313}
1314
1315static void ip6_link_failure(struct sk_buff *skb)
1316{
1317 struct rt6_info *rt;
1318
3ffe533c 1319 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1320
adf30907 1321 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1322 if (rt) {
1eb4f758
HFS		 1323 if (rt->rt6i_flags & RTF_CACHE) {
1324 dst_hold(&rt->dst);
8e3d5be7 1325 ip6_del_rt(rt);
1eb4f758 1326 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1327 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1328 }
1da177e4
LT		 1329 }
1330}
1331
45e4fd26
MKL		 1332static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1333{
1334 struct net *net = dev_net(rt->dst.dev);
1335
1336 rt->rt6i_flags |= RTF_MODIFIED;
1337 rt->rt6i_pmtu = mtu;
1338 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1339}
1340
1341static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1342 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1343{
67ba4152 1344 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1345
45e4fd26
MKL		 1346 if (rt6->rt6i_flags & RTF_LOCAL)
1347 return;
81aded24 1348
45e4fd26
MKL		 1349 dst_confirm(dst);
1350 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1351 if (mtu >= dst_mtu(dst))
1352 return;
9d289715 1353
45e4fd26
MKL		 1354 if (rt6->rt6i_flags & RTF_CACHE) {
1355 rt6_do_update_pmtu(rt6, mtu);
1356 } else {
1357 const struct in6_addr *daddr, *saddr;
1358 struct rt6_info *nrt6;
1359
1360 if (iph) {
1361 daddr = &iph->daddr;
1362 saddr = &iph->saddr;
1363 } else if (sk) {
1364 daddr = &sk->sk_v6_daddr;
1365 saddr = &inet6_sk(sk)->saddr;
1366 } else {
1367 return;
1368 }
1369 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1370 if (nrt6) {
1371 rt6_do_update_pmtu(nrt6, mtu);
1372
1373 /* ip6_ins_rt(nrt6) will bump the
1374 * rt6->rt6i_node->fn_sernum
1375 * which will fail the next rt6_check() and
1376 * invalidate the sk->sk_dst_cache.
1377 */
1378 ip6_ins_rt(nrt6);
1379 }
1da177e4
LT		 1380 }
1381}
1382
45e4fd26
MKL		 1383static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1384 struct sk_buff *skb, u32 mtu)
1385{
1386 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1387}
1388
42ae66c8
DM		 1389void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1390 int oif, u32 mark)
81aded24
DM		 1391{
1392 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1393 struct dst_entry *dst;
1394 struct flowi6 fl6;
1395
1396 memset(&fl6, 0, sizeof(fl6));
1397 fl6.flowi6_oif = oif;
1b3c61dc 1398 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1399 fl6.daddr = iph->daddr;
1400 fl6.saddr = iph->saddr;
6502ca52 1401 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1402
1403 dst = ip6_route_output(net, NULL, &fl6);
1404 if (!dst->error)
45e4fd26 1405 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1406 dst_release(dst);
1407}
1408EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1409
1410void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1411{
1412 ip6_update_pmtu(skb, sock_net(sk), mtu,
1413 sk->sk_bound_dev_if, sk->sk_mark);
1414}
1415EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1416
b55b76b2
DJ		 1417/* Handle redirects */
1418struct ip6rd_flowi {
1419 struct flowi6 fl6;
1420 struct in6_addr gateway;
1421};
1422
1423static struct rt6_info *__ip6_route_redirect(struct net *net,
1424 struct fib6_table *table,
1425 struct flowi6 *fl6,
1426 int flags)
1427{
1428 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1429 struct rt6_info *rt;
1430 struct fib6_node *fn;
1431
1432 /* Get the "current" route for this destination and
1433 * check if the redirect has come from approriate router.
1434 *
1435 * RFC 4861 specifies that redirects should only be
1436 * accepted if they come from the nexthop to the target.
1437 * Due to the way the routes are chosen, this notion
1438 * is a bit fuzzy and one might need to check all possible
1439 * routes.
1440 */
1441
1442 read_lock_bh(&table->tb6_lock);
1443 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1444restart:
1445 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1446 if (rt6_check_expired(rt))
1447 continue;
1448 if (rt->dst.error)
1449 break;
1450 if (!(rt->rt6i_flags & RTF_GATEWAY))
1451 continue;
1452 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1453 continue;
1454 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1455 continue;
1456 break;
1457 }
1458
1459 if (!rt)
1460 rt = net->ipv6.ip6_null_entry;
1461 else if (rt->dst.error) {
1462 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1463 goto out;
1464 }
1465
1466 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1467 fn = fib6_backtrack(fn, &fl6->saddr);
1468 if (fn)
1469 goto restart;
b55b76b2 1470 }
a3c00e46 1471
b0a1ba59 1472out:
b55b76b2
DJ		 1473 dst_hold(&rt->dst);
1474
1475 read_unlock_bh(&table->tb6_lock);
1476
1477 return rt;
1478};
1479
1480static struct dst_entry *ip6_route_redirect(struct net *net,
1481 const struct flowi6 *fl6,
1482 const struct in6_addr *gateway)
1483{
1484 int flags = RT6_LOOKUP_F_HAS_SADDR;
1485 struct ip6rd_flowi rdfl;
1486
1487 rdfl.fl6 = *fl6;
1488 rdfl.gateway = *gateway;
1489
1490 return fib6_rule_lookup(net, &rdfl.fl6,
1491 flags, __ip6_route_redirect);
1492}
1493
3a5ad2ee
DM		 1494void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1495{
1496 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1497 struct dst_entry *dst;
1498 struct flowi6 fl6;
1499
1500 memset(&fl6, 0, sizeof(fl6));
e374c618 1501 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1502 fl6.flowi6_oif = oif;
1503 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1504 fl6.daddr = iph->daddr;
1505 fl6.saddr = iph->saddr;
6502ca52 1506 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1507
b55b76b2
DJ		 1508 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1509 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1510 dst_release(dst);
1511}
1512EXPORT_SYMBOL_GPL(ip6_redirect);
1513
c92a59ec
DJ		 1514void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1515 u32 mark)
1516{
1517 const struct ipv6hdr *iph = ipv6_hdr(skb);
1518 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1519 struct dst_entry *dst;
1520 struct flowi6 fl6;
1521
1522 memset(&fl6, 0, sizeof(fl6));
e374c618 1523 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1524 fl6.flowi6_oif = oif;
1525 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1526 fl6.daddr = msg->dest;
1527 fl6.saddr = iph->daddr;
1528
b55b76b2
DJ		 1529 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1530 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1531 dst_release(dst);
1532}
1533
3a5ad2ee
DM		 1534void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1535{
1536 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1537}
1538EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1539
0dbaee3b 1540static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1541{
0dbaee3b
DM		 1542 struct net_device *dev = dst->dev;
1543 unsigned int mtu = dst_mtu(dst);
1544 struct net *net = dev_net(dev);
1545
1da177e4
LT		 1546 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1547
5578689a
DL		 1548 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1549 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1550
1551 /*
1ab1457c
YH		 1552 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1553 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1554 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1555 * rely only on pmtu discovery"
1556 */
1557 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1558 mtu = IPV6_MAXPLEN;
1559 return mtu;
1560}
1561
ebb762f2 1562static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1563{
4b32b5ad
MKL		 1564 const struct rt6_info *rt = (const struct rt6_info *)dst;
1565 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1566 struct inet6_dev *idev;
618f9bc7 1567
4b32b5ad
MKL		 1568 if (mtu)
1569 goto out;
1570
1571 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1572 if (mtu)
30f78d8e 1573 goto out;
618f9bc7
SK		 1574
1575 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1576
1577 rcu_read_lock();
1578 idev = __in6_dev_get(dst->dev);
1579 if (idev)
1580 mtu = idev->cnf.mtu6;
1581 rcu_read_unlock();
1582
30f78d8e
ED		 1583out:
1584 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1585}
1586
3b00944c
YH		 1587static struct dst_entry *icmp6_dst_gc_list;
1588static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1589
3b00944c 1590struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1591 struct flowi6 *fl6)
1da177e4 1592{
87a11578 1593 struct dst_entry *dst;
1da177e4
LT		 1594 struct rt6_info *rt;
1595 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1596 struct net *net = dev_net(dev);
1da177e4 1597
38308473 1598 if (unlikely(!idev))
122bdf67 1599 return ERR_PTR(-ENODEV);
1da177e4 1600
ad706862 1601 rt = ip6_dst_alloc(net, dev, 0);
38308473 1602 if (unlikely(!rt)) {
1da177e4 1603 in6_dev_put(idev);
87a11578 1604 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1605 goto out;
1606 }
1607
8e2ec639
YZ		 1608 rt->dst.flags |= DST_HOST;
1609 rt->dst.output = ip6_output;
d8d1f30b 1610 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1611 rt->rt6i_gateway = fl6->daddr;
87a11578 1612 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1613 rt->rt6i_dst.plen = 128;
1614 rt->rt6i_idev = idev;
14edd87d 1615 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1616
3b00944c 1617 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1618 rt->dst.next = icmp6_dst_gc_list;
1619 icmp6_dst_gc_list = &rt->dst;
3b00944c 1620 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1621
5578689a 1622 fib6_force_start_gc(net);
1da177e4 1623
87a11578
DM		 1624 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1625
1da177e4 1626out:
87a11578 1627 return dst;
1da177e4
LT		 1628}
1629
3d0f24a7 1630int icmp6_dst_gc(void)
1da177e4 1631{
e9476e95 1632 struct dst_entry *dst, **pprev;
3d0f24a7 1633 int more = 0;
1da177e4 1634
3b00944c
YH		 1635 spin_lock_bh(&icmp6_dst_lock);
1636 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1637
1da177e4
LT		 1638 while ((dst = *pprev) != NULL) {
1639 if (!atomic_read(&dst->__refcnt)) {
1640 *pprev = dst->next;
1641 dst_free(dst);
1da177e4
LT		 1642 } else {
1643 pprev = &dst->next;
3d0f24a7 1644 ++more;
1da177e4
LT		 1645 }
1646 }
1647
3b00944c 1648 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1649
3d0f24a7 1650 return more;
1da177e4
LT		 1651}
1652
1e493d19
DM		 1653static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1654 void *arg)
1655{
1656 struct dst_entry *dst, **pprev;
1657
1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
1660 while ((dst = *pprev) != NULL) {
1661 struct rt6_info *rt = (struct rt6_info *) dst;
1662 if (func(rt, arg)) {
1663 *pprev = dst->next;
1664 dst_free(dst);
1665 } else {
1666 pprev = &dst->next;
1667 }
1668 }
1669 spin_unlock_bh(&icmp6_dst_lock);
1670}
1671
569d3645 1672static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1673{
86393e52 1674 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1675 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1676 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1677 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1678 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1679 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1680 int entries;
7019b78e 1681
fc66f95c 1682 entries = dst_entries_get_fast(ops);
49a18d86 1683 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1684 entries <= rt_max_size)
1da177e4
LT		 1685 goto out;
1686
6891a346 1687 net->ipv6.ip6_rt_gc_expire++;
14956643 1688 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1689 entries = dst_entries_get_slow(ops);
1690 if (entries < ops->gc_thresh)
7019b78e 1691 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1692out:
7019b78e 1693 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1694 return entries > rt_max_size;
1da177e4
LT		 1695}
1696
e715b6d3
FW		 1697static int ip6_convert_metrics(struct mx6_config *mxc,
1698 const struct fib6_config *cfg)
1699{
c3a8d947 1700 bool ecn_ca = false;
e715b6d3
FW		 1701 struct nlattr *nla;
1702 int remaining;
1703 u32 *mp;
1704
63159f29 1705 if (!cfg->fc_mx)
e715b6d3
FW		 1706 return 0;
1707
1708 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1709 if (unlikely(!mp))
1710 return -ENOMEM;
1711
1712 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1713 int type = nla_type(nla);
1bb14807 1714 u32 val;
e715b6d3 1715
1bb14807
DB		 1716 if (!type)
1717 continue;
1718 if (unlikely(type > RTAX_MAX))
1719 goto err;
ea697639 1720
1bb14807
DB		 1721 if (type == RTAX_CC_ALGO) {
1722 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1723
1bb14807 1724 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1725 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1726 if (val == TCP_CA_UNSPEC)
1727 goto err;
1728 } else {
1729 val = nla_get_u32(nla);
e715b6d3 1730 }
b8d3e416
DB		 1731 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1732 goto err;
1bb14807
DB		 1733
1734 mp[type - 1] = val;
1735 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1736 }
1737
c3a8d947
DB		 1738 if (ecn_ca) {
1739 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1740 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1741 }
e715b6d3 1742
c3a8d947 1743 mxc->mx = mp;
e715b6d3
FW		 1744 return 0;
1745 err:
1746 kfree(mp);
1747 return -EINVAL;
1748}
1da177e4 1749
6b9ea5a6 1750int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
1da177e4
LT		 1751{
1752 int err;
5578689a 1753 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1754 struct rt6_info *rt = NULL;
1755 struct net_device *dev = NULL;
1756 struct inet6_dev *idev = NULL;
c71099ac 1757 struct fib6_table *table;
1da177e4
LT		 1758 int addr_type;
1759
86872cb5 1760 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1da177e4
LT		 1761 return -EINVAL;
1762#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1763 if (cfg->fc_src_len)
1da177e4
LT		 1764 return -EINVAL;
1765#endif
86872cb5 1766 if (cfg->fc_ifindex) {
1da177e4 1767 err = -ENODEV;
5578689a 1768 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1769 if (!dev)
1770 goto out;
1771 idev = in6_dev_get(dev);
1772 if (!idev)
1773 goto out;
1774 }
1775
86872cb5
TG		 1776 if (cfg->fc_metric == 0)
1777 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1778
d71314b4 1779 err = -ENOBUFS;
38308473
DM		 1780 if (cfg->fc_nlinfo.nlh &&
1781 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1782 table = fib6_get_table(net, cfg->fc_table);
38308473 1783 if (!table) {
f3213831 1784 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1785 table = fib6_new_table(net, cfg->fc_table);
1786 }
1787 } else {
1788 table = fib6_new_table(net, cfg->fc_table);
1789 }
38308473
DM		 1790
1791 if (!table)
c71099ac 1792 goto out;
c71099ac 1793
ad706862
MKL		 1794 rt = ip6_dst_alloc(net, NULL,
1795 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1796
38308473 1797 if (!rt) {
1da177e4
LT		 1798 err = -ENOMEM;
1799 goto out;
1800 }
1801
1716a961
G		 1802 if (cfg->fc_flags & RTF_EXPIRES)
1803 rt6_set_expires(rt, jiffies +
1804 clock_t_to_jiffies(cfg->fc_expires));
1805 else
1806 rt6_clean_expires(rt);
1da177e4 1807
86872cb5
TG		 1808 if (cfg->fc_protocol == RTPROT_UNSPEC)
1809 cfg->fc_protocol = RTPROT_BOOT;
1810 rt->rt6i_protocol = cfg->fc_protocol;
1811
1812 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1813
1814 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1815 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1816 else if (cfg->fc_flags & RTF_LOCAL)
1817 rt->dst.input = ip6_input;
1da177e4 1818 else
d8d1f30b 1819 rt->dst.input = ip6_forward;
1da177e4 1820
d8d1f30b 1821 rt->dst.output = ip6_output;
1da177e4 1822
19e42e45
RP		 1823 if (cfg->fc_encap) {
1824 struct lwtunnel_state *lwtstate;
1825
1826 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1827 cfg->fc_encap, AF_INET6, cfg,
1828 &lwtstate);
19e42e45
RP		 1829 if (err)
1830 goto out;
61adedf3
JB		 1831 rt->dst.lwtstate = lwtstate_get(lwtstate);
1832 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1833 rt->dst.lwtstate->orig_output = rt->dst.output;
1834 rt->dst.output = lwtunnel_output;
25368623 1835 }
61adedf3
JB		 1836 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1837 rt->dst.lwtstate->orig_input = rt->dst.input;
1838 rt->dst.input = lwtunnel_input;
25368623 1839 }
19e42e45
RP		 1840 }
1841
86872cb5
TG		 1842 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1843 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1844 if (rt->rt6i_dst.plen == 128)
e5fd387a 1845 rt->dst.flags |= DST_HOST;
e5fd387a 1846
1da177e4 1847#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1848 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1849 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1850#endif
1851
86872cb5 1852 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1853
1854 /* We cannot add true routes via loopback here,
1855 they would result in kernel looping; promote them to reject routes
1856 */
86872cb5 1857 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1858 (dev && (dev->flags & IFF_LOOPBACK) &&
1859 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1860 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1861 /* hold loopback dev/idev if we haven't done so. */
5578689a 1862 if (dev != net->loopback_dev) {
1da177e4
LT		 1863 if (dev) {
1864 dev_put(dev);
1865 in6_dev_put(idev);
1866 }
5578689a 1867 dev = net->loopback_dev;
1da177e4
LT		 1868 dev_hold(dev);
1869 idev = in6_dev_get(dev);
1870 if (!idev) {
1871 err = -ENODEV;
1872 goto out;
1873 }
1874 }
1da177e4 1875 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1876 switch (cfg->fc_type) {
1877 case RTN_BLACKHOLE:
1878 rt->dst.error = -EINVAL;
aad88724 1879 rt->dst.output = dst_discard_sk;
7150aede 1880 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1881 break;
1882 case RTN_PROHIBIT:
1883 rt->dst.error = -EACCES;
7150aede
K		 1884 rt->dst.output = ip6_pkt_prohibit_out;
1885 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1886 break;
b4949ab2 1887 case RTN_THROW:
ef2c7d7b 1888 default:
7150aede
K		 1889 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1890 : -ENETUNREACH;
1891 rt->dst.output = ip6_pkt_discard_out;
1892 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1893 break;
1894 }
1da177e4
LT		 1895 goto install_route;
1896 }
1897
86872cb5 1898 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1899 const struct in6_addr *gw_addr;
1da177e4
LT		 1900 int gwa_type;
1901
86872cb5 1902 gw_addr = &cfg->fc_gateway;
330567b7 1903 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1904
1905 /* if gw_addr is local we will fail to detect this in case
1906 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1907 * will return already-added prefix route via interface that
1908 * prefix route was assigned to, which might be non-loopback.
1909 */
1910 err = -EINVAL;
330567b7
FW		 1911 if (ipv6_chk_addr_and_flags(net, gw_addr,
1912 gwa_type & IPV6_ADDR_LINKLOCAL ?
1913 dev : NULL, 0, 0))
48ed7b26
FW		 1914 goto out;
1915
4e3fd7a0 1916 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1917
1918 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1919 struct rt6_info *grt;
1920
1921 /* IPv6 strictly inhibits using not link-local
1922 addresses as nexthop address.
1923 Otherwise, router will not able to send redirects.
1924 It is very good, but in some (rare!) circumstances
1925 (SIT, PtP, NBMA NOARP links) it is handy to allow
1926 some exceptions. --ANK
1927 */
38308473 1928 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1929 goto out;
1930
5578689a 1931 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1932
1933 err = -EHOSTUNREACH;
38308473 1934 if (!grt)
1da177e4
LT		 1935 goto out;
1936 if (dev) {
d1918542 1937 if (dev != grt->dst.dev) {
94e187c0 1938 ip6_rt_put(grt);
1da177e4
LT		 1939 goto out;
1940 }
1941 } else {
d1918542 1942 dev = grt->dst.dev;
1da177e4
LT		 1943 idev = grt->rt6i_idev;
1944 dev_hold(dev);
1945 in6_dev_hold(grt->rt6i_idev);
1946 }
38308473 1947 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1948 err = 0;
94e187c0 1949 ip6_rt_put(grt);
1da177e4
LT		 1950
1951 if (err)
1952 goto out;
1953 }
1954 err = -EINVAL;
38308473 1955 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1956 goto out;
1957 }
1958
1959 err = -ENODEV;
38308473 1960 if (!dev)
1da177e4
LT		 1961 goto out;
1962
c3968a85
DW		 1963 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1964 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1965 err = -EINVAL;
1966 goto out;
1967 }
4e3fd7a0 1968 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1969 rt->rt6i_prefsrc.plen = 128;
1970 } else
1971 rt->rt6i_prefsrc.plen = 0;
1972
86872cb5 1973 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1974
1975install_route:
d8d1f30b 1976 rt->dst.dev = dev;
1da177e4 1977 rt->rt6i_idev = idev;
c71099ac 1978 rt->rt6i_table = table;
63152fc0 1979
c346dca1 1980 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1981
6b9ea5a6
RP		 1982 *rt_ret = rt;
1983
1984 return 0;
1985out:
1986 if (dev)
1987 dev_put(dev);
1988 if (idev)
1989 in6_dev_put(idev);
1990 if (rt)
1991 dst_free(&rt->dst);
1992
1993 *rt_ret = NULL;
1994
1995 return err;
1996}
1997
1998int ip6_route_add(struct fib6_config *cfg)
1999{
2000 struct mx6_config mxc = { .mx = NULL, };
2001 struct rt6_info *rt = NULL;
2002 int err;
2003
2004 err = ip6_route_info_create(cfg, &rt);
2005 if (err)
2006 goto out;
2007
e715b6d3
FW		 2008 err = ip6_convert_metrics(&mxc, cfg);
2009 if (err)
2010 goto out;
1da177e4 2011
e715b6d3
FW		 2012 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2013
2014 kfree(mxc.mx);
6b9ea5a6 2015
e715b6d3 2016 return err;
1da177e4 2017out:
1da177e4 2018 if (rt)
d8d1f30b 2019 dst_free(&rt->dst);
6b9ea5a6 2020
1da177e4
LT		 2021 return err;
2022}
2023
86872cb5 2024static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2025{
2026 int err;
c71099ac 2027 struct fib6_table *table;
d1918542 2028 struct net *net = dev_net(rt->dst.dev);
1da177e4 2029
8e3d5be7
MKL		 2030 if (rt == net->ipv6.ip6_null_entry ||
2031 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2032 err = -ENOENT;
2033 goto out;
2034 }
6c813a72 2035
c71099ac
TG		 2036 table = rt->rt6i_table;
2037 write_lock_bh(&table->tb6_lock);
86872cb5 2038 err = fib6_del(rt, info);
c71099ac 2039 write_unlock_bh(&table->tb6_lock);
1da177e4 2040
6825a26c 2041out:
94e187c0 2042 ip6_rt_put(rt);
1da177e4
LT		 2043 return err;
2044}
2045
e0a1ad73
TG		 2046int ip6_del_rt(struct rt6_info *rt)
2047{
4d1169c1 2048 struct nl_info info = {
d1918542 2049 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2050 };
528c4ceb 2051 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2052}
2053
86872cb5 2054static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2055{
c71099ac 2056 struct fib6_table *table;
1da177e4
LT		 2057 struct fib6_node *fn;
2058 struct rt6_info *rt;
2059 int err = -ESRCH;
2060
5578689a 2061 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2062 if (!table)
c71099ac
TG		 2063 return err;
2064
2065 read_lock_bh(&table->tb6_lock);
1da177e4 2066
c71099ac 2067 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2068 &cfg->fc_dst, cfg->fc_dst_len,
2069 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2070
1da177e4 2071 if (fn) {
d8d1f30b 2072 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2073 if ((rt->rt6i_flags & RTF_CACHE) &&
2074 !(cfg->fc_flags & RTF_CACHE))
2075 continue;
86872cb5 2076 if (cfg->fc_ifindex &&
d1918542
DM		 2077 (!rt->dst.dev ||
2078 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2079 continue;
86872cb5
TG		 2080 if (cfg->fc_flags & RTF_GATEWAY &&
2081 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2082 continue;
86872cb5 2083 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2084 continue;
d8d1f30b 2085 dst_hold(&rt->dst);
c71099ac 2086 read_unlock_bh(&table->tb6_lock);
1da177e4 2087
86872cb5 2088 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2089 }
2090 }
c71099ac 2091 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2092
2093 return err;
2094}
2095
6700c270 2096static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2097{
e8599ff4 2098 struct net *net = dev_net(skb->dev);
a6279458 2099 struct netevent_redirect netevent;
e8599ff4 2100 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2101 struct ndisc_options ndopts;
2102 struct inet6_dev *in6_dev;
2103 struct neighbour *neigh;
71bcdba0 2104 struct rd_msg *msg;
6e157b6a
DM		 2105 int optlen, on_link;
2106 u8 *lladdr;
e8599ff4 2107
29a3cad5 2108 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2109 optlen -= sizeof(*msg);
e8599ff4
DM		 2110
2111 if (optlen < 0) {
6e157b6a 2112 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2113 return;
2114 }
2115
71bcdba0 2116 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2117
71bcdba0 2118 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2119 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2120 return;
2121 }
2122
6e157b6a 2123 on_link = 0;
71bcdba0 2124 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2125 on_link = 1;
71bcdba0 2126 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2127 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2128 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2129 return;
2130 }
2131
2132 in6_dev = __in6_dev_get(skb->dev);
2133 if (!in6_dev)
2134 return;
2135 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2136 return;
2137
2138 /* RFC2461 8.1:
2139 * The IP source address of the Redirect MUST be the same as the current
2140 * first-hop router for the specified ICMP Destination Address.
2141 */
2142
71bcdba0 2143 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2144 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2145 return;
2146 }
6e157b6a
DM		 2147
2148 lladdr = NULL;
e8599ff4
DM		 2149 if (ndopts.nd_opts_tgt_lladdr) {
2150 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2151 skb->dev);
2152 if (!lladdr) {
2153 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2154 return;
2155 }
2156 }
2157
6e157b6a
DM		 2158 rt = (struct rt6_info *) dst;
2159 if (rt == net->ipv6.ip6_null_entry) {
2160 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2161 return;
6e157b6a 2162 }
e8599ff4 2163
6e157b6a
DM		 2164 /* Redirect received -> path was valid.
2165 * Look, redirects are sent only in response to data packets,
2166 * so that this nexthop apparently is reachable. --ANK
2167 */
2168 dst_confirm(&rt->dst);
a6279458 2169
71bcdba0 2170 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2171 if (!neigh)
2172 return;
a6279458 2173
1da177e4
LT		 2174 /*
2175 * We have finally decided to accept it.
2176 */
2177
1ab1457c 2178 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2179 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2180 NEIGH_UPDATE_F_OVERRIDE|
2181 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2182 NEIGH_UPDATE_F_ISROUTER))
2183 );
2184
83a09abd 2185 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2186 if (!nrt)
1da177e4
LT		 2187 goto out;
2188
2189 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2190 if (on_link)
2191 nrt->rt6i_flags &= ~RTF_GATEWAY;
2192
4e3fd7a0 2193 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2194
40e22e8f 2195 if (ip6_ins_rt(nrt))
1da177e4
LT		 2196 goto out;
2197
d8d1f30b
CG		 2198 netevent.old = &rt->dst;
2199 netevent.new = &nrt->dst;
71bcdba0 2200 netevent.daddr = &msg->dest;
60592833 2201 netevent.neigh = neigh;
8d71740c
TT		 2202 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2203
38308473 2204 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2205 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2206 ip6_del_rt(rt);
1da177e4
LT		 2207 }
2208
2209out:
e8599ff4 2210 neigh_release(neigh);
6e157b6a
DM		 2211}
2212
1da177e4
LT		 2213/*
2214 * Misc support functions
2215 */
2216
4b32b5ad
MKL		 2217static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2218{
2219 BUG_ON(from->dst.from);
2220
2221 rt->rt6i_flags &= ~RTF_EXPIRES;
2222 dst_hold(&from->dst);
2223 rt->dst.from = &from->dst;
2224 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2225}
2226
83a09abd
MKL		 2227static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2228{
2229 rt->dst.input = ort->dst.input;
2230 rt->dst.output = ort->dst.output;
2231 rt->rt6i_dst = ort->rt6i_dst;
2232 rt->dst.error = ort->dst.error;
2233 rt->rt6i_idev = ort->rt6i_idev;
2234 if (rt->rt6i_idev)
2235 in6_dev_hold(rt->rt6i_idev);
2236 rt->dst.lastuse = jiffies;
2237 rt->rt6i_gateway = ort->rt6i_gateway;
2238 rt->rt6i_flags = ort->rt6i_flags;
2239 rt6_set_from(rt, ort);
2240 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2241#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2242 rt->rt6i_src = ort->rt6i_src;
1da177e4 2243#endif
83a09abd
MKL		 2244 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2245 rt->rt6i_table = ort->rt6i_table;
61adedf3 2246 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2247}
2248
70ceb4f5 2249#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2250static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2251 const struct in6_addr *prefix, int prefixlen,
2252 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2253{
2254 struct fib6_node *fn;
2255 struct rt6_info *rt = NULL;
c71099ac
TG		 2256 struct fib6_table *table;
2257
efa2cea0 2258 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2259 if (!table)
c71099ac 2260 return NULL;
70ceb4f5 2261
5744dd9b 2262 read_lock_bh(&table->tb6_lock);
67ba4152 2263 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2264 if (!fn)
2265 goto out;
2266
d8d1f30b 2267 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2268 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2269 continue;
2270 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2271 continue;
2272 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2273 continue;
d8d1f30b 2274 dst_hold(&rt->dst);
70ceb4f5
YH		 2275 break;
2276 }
2277out:
5744dd9b 2278 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2279 return rt;
2280}
2281
efa2cea0 2282static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2283 const struct in6_addr *prefix, int prefixlen,
2284 const struct in6_addr *gwaddr, int ifindex,
95c96174 2285 unsigned int pref)
70ceb4f5 2286{
86872cb5
TG		 2287 struct fib6_config cfg = {
2288 .fc_table = RT6_TABLE_INFO,
238fc7ea 2289 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2290 .fc_ifindex = ifindex,
2291 .fc_dst_len = prefixlen,
2292 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2293 RTF_UP | RTF_PREF(pref),
15e47304 2294 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2295 .fc_nlinfo.nlh = NULL,
2296 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2297 };
2298
4e3fd7a0
AD		 2299 cfg.fc_dst = *prefix;
2300 cfg.fc_gateway = *gwaddr;
70ceb4f5 2301
e317da96
YH		 2302 /* We should treat it as a default route if prefix length is 0. */
2303 if (!prefixlen)
86872cb5 2304 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2305
86872cb5 2306 ip6_route_add(&cfg);
70ceb4f5 2307
efa2cea0 2308 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2309}
2310#endif
2311
b71d1d42 2312struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2313{
1da177e4 2314 struct rt6_info *rt;
c71099ac 2315 struct fib6_table *table;
1da177e4 2316
c346dca1 2317 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2318 if (!table)
c71099ac 2319 return NULL;
1da177e4 2320
5744dd9b 2321 read_lock_bh(&table->tb6_lock);
67ba4152 2322 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2323 if (dev == rt->dst.dev &&
045927ff 2324 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2325 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2326 break;
2327 }
2328 if (rt)
d8d1f30b 2329 dst_hold(&rt->dst);
5744dd9b 2330 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2331 return rt;
2332}
2333
b71d1d42 2334struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2335 struct net_device *dev,
2336 unsigned int pref)
1da177e4 2337{
86872cb5
TG		 2338 struct fib6_config cfg = {
2339 .fc_table = RT6_TABLE_DFLT,
238fc7ea 2340 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2341 .fc_ifindex = dev->ifindex,
2342 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2343 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2344 .fc_nlinfo.portid = 0,
5578689a 2345 .fc_nlinfo.nlh = NULL,
c346dca1 2346 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2347 };
1da177e4 2348
4e3fd7a0 2349 cfg.fc_gateway = *gwaddr;
1da177e4 2350
86872cb5 2351 ip6_route_add(&cfg);
1da177e4 2352
1da177e4
LT		 2353 return rt6_get_dflt_router(gwaddr, dev);
2354}
2355
7b4da532 2356void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2357{
2358 struct rt6_info *rt;
c71099ac
TG		 2359 struct fib6_table *table;
2360
2361 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2362 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2363 if (!table)
c71099ac 2364 return;
1da177e4
LT		 2365
2366restart:
c71099ac 2367 read_lock_bh(&table->tb6_lock);
d8d1f30b 2368 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2369 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2370 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2371 dst_hold(&rt->dst);
c71099ac 2372 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2373 ip6_del_rt(rt);
1da177e4
LT		 2374 goto restart;
2375 }
2376 }
c71099ac 2377 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2378}
2379
5578689a
DL		 2380static void rtmsg_to_fib6_config(struct net *net,
2381 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2382 struct fib6_config *cfg)
2383{
2384 memset(cfg, 0, sizeof(*cfg));
2385
2386 cfg->fc_table = RT6_TABLE_MAIN;
2387 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2388 cfg->fc_metric = rtmsg->rtmsg_metric;
2389 cfg->fc_expires = rtmsg->rtmsg_info;
2390 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2391 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2392 cfg->fc_flags = rtmsg->rtmsg_flags;
2393
5578689a 2394 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2395
4e3fd7a0
AD		 2396 cfg->fc_dst = rtmsg->rtmsg_dst;
2397 cfg->fc_src = rtmsg->rtmsg_src;
2398 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2399}
2400
5578689a 2401int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2402{
86872cb5 2403 struct fib6_config cfg;
1da177e4
LT		 2404 struct in6_rtmsg rtmsg;
2405 int err;
2406
67ba4152 2407 switch (cmd) {
1da177e4
LT		 2408 case SIOCADDRT: /* Add a route */
2409 case SIOCDELRT: /* Delete a route */
af31f412 2410 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2411 return -EPERM;
2412 err = copy_from_user(&rtmsg, arg,
2413 sizeof(struct in6_rtmsg));
2414 if (err)
2415 return -EFAULT;
86872cb5 2416
5578689a 2417 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2418
1da177e4
LT		 2419 rtnl_lock();
2420 switch (cmd) {
2421 case SIOCADDRT:
86872cb5 2422 err = ip6_route_add(&cfg);
1da177e4
LT		 2423 break;
2424 case SIOCDELRT:
86872cb5 2425 err = ip6_route_del(&cfg);
1da177e4
LT		 2426 break;
2427 default:
2428 err = -EINVAL;
2429 }
2430 rtnl_unlock();
2431
2432 return err;
3ff50b79 2433 }
1da177e4
LT		 2434
2435 return -EINVAL;
2436}
2437
2438/*
2439 * Drop the packet on the floor
2440 */
2441
d5fdd6ba 2442static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2443{
612f09e8 2444 int type;
adf30907 2445 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2446 switch (ipstats_mib_noroutes) {
2447 case IPSTATS_MIB_INNOROUTES:
0660e03f 2448 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2449 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2450 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2451 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2452 break;
2453 }
2454 /* FALLTHROUGH */
2455 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2456 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2457 ipstats_mib_noroutes);
612f09e8
YH		 2458 break;
2459 }
3ffe533c 2460 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2461 kfree_skb(skb);
2462 return 0;
2463}
2464
9ce8ade0
TG		 2465static int ip6_pkt_discard(struct sk_buff *skb)
2466{
612f09e8 2467 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2468}
2469
aad88724 2470static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
1da177e4 2471{
adf30907 2472 skb->dev = skb_dst(skb)->dev;
612f09e8 2473 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2474}
2475
9ce8ade0
TG		 2476static int ip6_pkt_prohibit(struct sk_buff *skb)
2477{
612f09e8 2478 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2479}
2480
aad88724 2481static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
9ce8ade0 2482{
adf30907 2483 skb->dev = skb_dst(skb)->dev;
612f09e8 2484 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2485}
2486
1da177e4
LT		 2487/*
2488 * Allocate a dst for local (unicast / anycast) address.
2489 */
2490
2491struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2492 const struct in6_addr *addr,
8f031519 2493 bool anycast)
1da177e4 2494{
c346dca1 2495 struct net *net = dev_net(idev->dev);
a3300ef4 2496 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2497 DST_NOCOUNT);
a3300ef4 2498 if (!rt)
1da177e4
LT		 2499 return ERR_PTR(-ENOMEM);
2500
1da177e4
LT		 2501 in6_dev_hold(idev);
2502
11d53b49 2503 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2504 rt->dst.input = ip6_input;
2505 rt->dst.output = ip6_output;
1da177e4 2506 rt->rt6i_idev = idev;
1da177e4
LT		 2507
2508 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2509 if (anycast)
2510 rt->rt6i_flags |= RTF_ANYCAST;
2511 else
1da177e4 2512 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2513
550bab42 2514 rt->rt6i_gateway = *addr;
4e3fd7a0 2515 rt->rt6i_dst.addr = *addr;
1da177e4 2516 rt->rt6i_dst.plen = 128;
5578689a 2517 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
8e3d5be7 2518 rt->dst.flags |= DST_NOCACHE;
1da177e4 2519
d8d1f30b 2520 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2521
2522 return rt;
2523}
2524
c3968a85
DW		 2525int ip6_route_get_saddr(struct net *net,
2526 struct rt6_info *rt,
b71d1d42 2527 const struct in6_addr *daddr,
c3968a85
DW		 2528 unsigned int prefs,
2529 struct in6_addr *saddr)
2530{
e16e888b
MS		 2531 struct inet6_dev *idev =
2532 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2533 int err = 0;
e16e888b 2534 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2535 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2536 else
2537 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2538 daddr, prefs, saddr);
2539 return err;
2540}
2541
2542/* remove deleted ip from prefsrc entries */
2543struct arg_dev_net_ip {
2544 struct net_device *dev;
2545 struct net *net;
2546 struct in6_addr *addr;
2547};
2548
2549static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2550{
2551 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2552 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2553 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2554
d1918542 2555 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2556 rt != net->ipv6.ip6_null_entry &&
2557 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2558 /* remove prefsrc entry */
2559 rt->rt6i_prefsrc.plen = 0;
2560 }
2561 return 0;
2562}
2563
2564void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2565{
2566 struct net *net = dev_net(ifp->idev->dev);
2567 struct arg_dev_net_ip adni = {
2568 .dev = ifp->idev->dev,
2569 .net = net,
2570 .addr = &ifp->addr,
2571 };
0c3584d5 2572 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2573}
2574
be7a010d
DJ		 2575#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2576#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2577
2578/* Remove routers and update dst entries when gateway turn into host. */
2579static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2580{
2581 struct in6_addr *gateway = (struct in6_addr *)arg;
2582
2583 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2584 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2585 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2586 return -1;
2587 }
2588 return 0;
2589}
2590
2591void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2592{
2593 fib6_clean_all(net, fib6_clean_tohost, gateway);
2594}
2595
8ed67789
DL		 2596struct arg_dev_net {
2597 struct net_device *dev;
2598 struct net *net;
2599};
2600
1da177e4
LT		 2601static int fib6_ifdown(struct rt6_info *rt, void *arg)
2602{
bc3ef660 2603 const struct arg_dev_net *adn = arg;
2604 const struct net_device *dev = adn->dev;
8ed67789 2605
d1918542 2606 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2607 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2608 return -1;
c159d30c 2609
1da177e4
LT		 2610 return 0;
2611}
2612
f3db4851 2613void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2614{
8ed67789
DL		 2615 struct arg_dev_net adn = {
2616 .dev = dev,
2617 .net = net,
2618 };
2619
0c3584d5 2620 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2621 icmp6_clean_all(fib6_ifdown, &adn);
8d0b94af 2622 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2623}
2624
95c96174 2625struct rt6_mtu_change_arg {
1da177e4 2626 struct net_device *dev;
95c96174 2627 unsigned int mtu;
1da177e4
LT		 2628};
2629
2630static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2631{
2632 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2633 struct inet6_dev *idev;
2634
2635 /* In IPv6 pmtu discovery is not optional,
2636 so that RTAX_MTU lock cannot disable it.
2637 We still use this lock to block changes
2638 caused by addrconf/ndisc.
2639 */
2640
2641 idev = __in6_dev_get(arg->dev);
38308473 2642 if (!idev)
1da177e4
LT		 2643 return 0;
2644
2645 /* For administrative MTU increase, there is no way to discover
2646 IPv6 PMTU increase, so PMTU increase should be updated here.
2647 Since RFC 1981 doesn't include administrative MTU increase
2648 update PMTU increase is a MUST. (i.e. jumbo frame)
2649 */
2650 /*
2651 If new MTU is less than route PMTU, this new MTU will be the
2652 lowest MTU in the path, update the route PMTU to reflect PMTU
2653 decreases; if new MTU is greater than route PMTU, and the
2654 old MTU is the lowest MTU in the path, update the route PMTU
2655 to reflect the increase. In this case if the other nodes' MTU
2656 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2657 PMTU discouvery.
2658 */
d1918542 2659 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2660 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2661 if (rt->rt6i_flags & RTF_CACHE) {
2662 /* For RTF_CACHE with rt6i_pmtu == 0
2663 * (i.e. a redirected route),
2664 * the metrics of its rt->dst.from has already
2665 * been updated.
2666 */
2667 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2668 rt->rt6i_pmtu = arg->mtu;
2669 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2670 (dst_mtu(&rt->dst) < arg->mtu &&
2671 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2672 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2673 }
566cfd8f 2674 }
1da177e4
LT		 2675 return 0;
2676}
2677
95c96174 2678void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2679{
c71099ac
TG		 2680 struct rt6_mtu_change_arg arg = {
2681 .dev = dev,
2682 .mtu = mtu,
2683 };
1da177e4 2684
0c3584d5 2685 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2686}
2687
ef7c79ed 2688static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2689 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2690 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2691 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2692 [RTA_PRIORITY] = { .type = NLA_U32 },
2693 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2694 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2695 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2696 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2697 [RTA_ENCAP] = { .type = NLA_NESTED },
86872cb5
TG		 2698};
2699
2700static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2701 struct fib6_config *cfg)
1da177e4 2702{
86872cb5
TG		 2703 struct rtmsg *rtm;
2704 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2705 unsigned int pref;
86872cb5 2706 int err;
1da177e4 2707
86872cb5
TG		 2708 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2709 if (err < 0)
2710 goto errout;
1da177e4 2711
86872cb5
TG		 2712 err = -EINVAL;
2713 rtm = nlmsg_data(nlh);
2714 memset(cfg, 0, sizeof(*cfg));
2715
2716 cfg->fc_table = rtm->rtm_table;
2717 cfg->fc_dst_len = rtm->rtm_dst_len;
2718 cfg->fc_src_len = rtm->rtm_src_len;
2719 cfg->fc_flags = RTF_UP;
2720 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2721 cfg->fc_type = rtm->rtm_type;
86872cb5 2722
ef2c7d7b
ND		 2723 if (rtm->rtm_type == RTN_UNREACHABLE ||
2724 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2725 rtm->rtm_type == RTN_PROHIBIT ||
2726 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2727 cfg->fc_flags |= RTF_REJECT;
2728
ab79ad14
MŻ		 2729 if (rtm->rtm_type == RTN_LOCAL)
2730 cfg->fc_flags |= RTF_LOCAL;
2731
1f56a01f
MKL		 2732 if (rtm->rtm_flags & RTM_F_CLONED)
2733 cfg->fc_flags |= RTF_CACHE;
2734
15e47304 2735 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2736 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2737 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2738
2739 if (tb[RTA_GATEWAY]) {
67b61f6c 2740 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2741 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2742 }
86872cb5
TG		 2743
2744 if (tb[RTA_DST]) {
2745 int plen = (rtm->rtm_dst_len + 7) >> 3;
2746
2747 if (nla_len(tb[RTA_DST]) < plen)
2748 goto errout;
2749
2750 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2751 }
86872cb5
TG		 2752
2753 if (tb[RTA_SRC]) {
2754 int plen = (rtm->rtm_src_len + 7) >> 3;
2755
2756 if (nla_len(tb[RTA_SRC]) < plen)
2757 goto errout;
2758
2759 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2760 }
86872cb5 2761
c3968a85 2762 if (tb[RTA_PREFSRC])
67b61f6c 2763 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2764
86872cb5
TG		 2765 if (tb[RTA_OIF])
2766 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2767
2768 if (tb[RTA_PRIORITY])
2769 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2770
2771 if (tb[RTA_METRICS]) {
2772 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2773 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2774 }
86872cb5
TG		 2775
2776 if (tb[RTA_TABLE])
2777 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2778
51ebd318
ND		 2779 if (tb[RTA_MULTIPATH]) {
2780 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2781 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2782 }
2783
c78ba6d6
LR		 2784 if (tb[RTA_PREF]) {
2785 pref = nla_get_u8(tb[RTA_PREF]);
2786 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2787 pref != ICMPV6_ROUTER_PREF_HIGH)
2788 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2789 cfg->fc_flags |= RTF_PREF(pref);
2790 }
2791
19e42e45
RP		 2792 if (tb[RTA_ENCAP])
2793 cfg->fc_encap = tb[RTA_ENCAP];
2794
2795 if (tb[RTA_ENCAP_TYPE])
2796 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2797
86872cb5
TG		 2798 err = 0;
2799errout:
2800 return err;
1da177e4
LT		 2801}
2802
6b9ea5a6
RP		 2803struct rt6_nh {
2804 struct rt6_info *rt6_info;
2805 struct fib6_config r_cfg;
2806 struct mx6_config mxc;
2807 struct list_head next;
2808};
2809
2810static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2811{
2812 struct rt6_nh *nh;
2813
2814 list_for_each_entry(nh, rt6_nh_list, next) {
2815 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2816 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2817 nh->r_cfg.fc_ifindex);
2818 }
2819}
2820
2821static int ip6_route_info_append(struct list_head *rt6_nh_list,
2822 struct rt6_info *rt, struct fib6_config *r_cfg)
2823{
2824 struct rt6_nh *nh;
2825 struct rt6_info *rtnh;
2826 int err = -EEXIST;
2827
2828 list_for_each_entry(nh, rt6_nh_list, next) {
2829 /* check if rt6_info already exists */
2830 rtnh = nh->rt6_info;
2831
2832 if (rtnh->dst.dev == rt->dst.dev &&
2833 rtnh->rt6i_idev == rt->rt6i_idev &&
2834 ipv6_addr_equal(&rtnh->rt6i_gateway,
2835 &rt->rt6i_gateway))
2836 return err;
2837 }
2838
2839 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2840 if (!nh)
2841 return -ENOMEM;
2842 nh->rt6_info = rt;
2843 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2844 if (err) {
2845 kfree(nh);
2846 return err;
2847 }
2848 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2849 list_add_tail(&nh->next, rt6_nh_list);
2850
2851 return 0;
2852}
2853
2854static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2855{
2856 struct fib6_config r_cfg;
2857 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2858 struct rt6_info *rt;
2859 struct rt6_nh *err_nh;
2860 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2861 int remaining;
2862 int attrlen;
6b9ea5a6
RP		 2863 int err = 1;
2864 int nhn = 0;
2865 int replace = (cfg->fc_nlinfo.nlh &&
2866 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2867 LIST_HEAD(rt6_nh_list);
51ebd318 2868
35f1b4e9 2869 remaining = cfg->fc_mp_len;
51ebd318 2870 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2871
6b9ea5a6
RP		 2872 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2873 * rt6_info structs per nexthop
2874 */
51ebd318
ND		 2875 while (rtnh_ok(rtnh, remaining)) {
2876 memcpy(&r_cfg, cfg, sizeof(*cfg));
2877 if (rtnh->rtnh_ifindex)
2878 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2879
2880 attrlen = rtnh_attrlen(rtnh);
2881 if (attrlen > 0) {
2882 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2883
2884 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2885 if (nla) {
67b61f6c 2886 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2887 r_cfg.fc_flags |= RTF_GATEWAY;
2888 }
19e42e45
RP		 2889 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2890 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2891 if (nla)
2892 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2893 }
6b9ea5a6
RP		 2894
2895 err = ip6_route_info_create(&r_cfg, &rt);
2896 if (err)
2897 goto cleanup;
2898
2899 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2900 if (err) {
6b9ea5a6
RP		 2901 dst_free(&rt->dst);
2902 goto cleanup;
2903 }
2904
2905 rtnh = rtnh_next(rtnh, &remaining);
2906 }
2907
2908 err_nh = NULL;
2909 list_for_each_entry(nh, &rt6_nh_list, next) {
2910 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2911 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2912 nh->rt6_info = NULL;
2913 if (err) {
2914 if (replace && nhn)
2915 ip6_print_replace_route_err(&rt6_nh_list);
2916 err_nh = nh;
2917 goto add_errout;
51ebd318 2918 }
6b9ea5a6 2919
1a72418b 2920 /* Because each route is added like a single route we remove
27596472
MK		 2921 * these flags after the first nexthop: if there is a collision,
2922 * we have already failed to add the first nexthop:
2923 * fib6_add_rt2node() has rejected it; when replacing, old
2924 * nexthops have been replaced by first new, the rest should
2925 * be added to it.
1a72418b 2926 */
27596472
MK		 2927 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2928 NLM_F_REPLACE);
6b9ea5a6
RP		 2929 nhn++;
2930 }
2931
2932 goto cleanup;
2933
2934add_errout:
2935 /* Delete routes that were already added */
2936 list_for_each_entry(nh, &rt6_nh_list, next) {
2937 if (err_nh == nh)
2938 break;
2939 ip6_route_del(&nh->r_cfg);
2940 }
2941
2942cleanup:
2943 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2944 if (nh->rt6_info)
2945 dst_free(&nh->rt6_info->dst);
52fe51f8 2946 kfree(nh->mxc.mx);
6b9ea5a6
RP		 2947 list_del(&nh->next);
2948 kfree(nh);
2949 }
2950
2951 return err;
2952}
2953
2954static int ip6_route_multipath_del(struct fib6_config *cfg)
2955{
2956 struct fib6_config r_cfg;
2957 struct rtnexthop *rtnh;
2958 int remaining;
2959 int attrlen;
2960 int err = 1, last_err = 0;
2961
2962 remaining = cfg->fc_mp_len;
2963 rtnh = (struct rtnexthop *)cfg->fc_mp;
2964
2965 /* Parse a Multipath Entry */
2966 while (rtnh_ok(rtnh, remaining)) {
2967 memcpy(&r_cfg, cfg, sizeof(*cfg));
2968 if (rtnh->rtnh_ifindex)
2969 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2970
2971 attrlen = rtnh_attrlen(rtnh);
2972 if (attrlen > 0) {
2973 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2974
2975 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2976 if (nla) {
2977 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2978 r_cfg.fc_flags |= RTF_GATEWAY;
2979 }
2980 }
2981 err = ip6_route_del(&r_cfg);
2982 if (err)
2983 last_err = err;
2984
51ebd318
ND		 2985 rtnh = rtnh_next(rtnh, &remaining);
2986 }
2987
2988 return last_err;
2989}
2990
67ba4152 2991static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2992{
86872cb5
TG		 2993 struct fib6_config cfg;
2994 int err;
1da177e4 2995
86872cb5
TG		 2996 err = rtm_to_fib6_config(skb, nlh, &cfg);
2997 if (err < 0)
2998 return err;
2999
51ebd318 3000 if (cfg.fc_mp)
6b9ea5a6 3001 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3002 else
3003 return ip6_route_del(&cfg);
1da177e4
LT		 3004}
3005
67ba4152 3006static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3007{
86872cb5
TG		 3008 struct fib6_config cfg;
3009 int err;
1da177e4 3010
86872cb5
TG		 3011 err = rtm_to_fib6_config(skb, nlh, &cfg);
3012 if (err < 0)
3013 return err;
3014
51ebd318 3015 if (cfg.fc_mp)
6b9ea5a6 3016 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3017 else
3018 return ip6_route_add(&cfg);
1da177e4
LT		 3019}
3020
19e42e45 3021static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3022{
3023 return NLMSG_ALIGN(sizeof(struct rtmsg))
3024 + nla_total_size(16) /* RTA_SRC */
3025 + nla_total_size(16) /* RTA_DST */
3026 + nla_total_size(16) /* RTA_GATEWAY */
3027 + nla_total_size(16) /* RTA_PREFSRC */
3028 + nla_total_size(4) /* RTA_TABLE */
3029 + nla_total_size(4) /* RTA_IIF */
3030 + nla_total_size(4) /* RTA_OIF */
3031 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3032 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3033 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3034 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3035 + nla_total_size(1) /* RTA_PREF */
61adedf3 3036 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3037}
3038
191cd582
BH		 3039static int rt6_fill_node(struct net *net,
3040 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3041 struct in6_addr *dst, struct in6_addr *src,
15e47304 3042 int iif, int type, u32 portid, u32 seq,
7bc570c8 3043 int prefix, int nowait, unsigned int flags)
1da177e4 3044{
4b32b5ad 3045 u32 metrics[RTAX_MAX];
1da177e4 3046 struct rtmsg *rtm;
2d7202bf 3047 struct nlmsghdr *nlh;
e3703b3d 3048 long expires;
9e762a4a 3049 u32 table;
1da177e4
LT		 3050
3051 if (prefix) { /* user wants prefix routes only */
3052 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3053 /* success since this is not a prefix route */
3054 return 1;
3055 }
3056 }
3057
15e47304 3058 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3059 if (!nlh)
26932566 3060 return -EMSGSIZE;
2d7202bf
TG		 3061
3062 rtm = nlmsg_data(nlh);
1da177e4
LT		 3063 rtm->rtm_family = AF_INET6;
3064 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3065 rtm->rtm_src_len = rt->rt6i_src.plen;
3066 rtm->rtm_tos = 0;
c71099ac 3067 if (rt->rt6i_table)
9e762a4a 3068 table = rt->rt6i_table->tb6_id;
c71099ac 3069 else
9e762a4a
PM		 3070 table = RT6_TABLE_UNSPEC;
3071 rtm->rtm_table = table;
c78679e8
DM		 3072 if (nla_put_u32(skb, RTA_TABLE, table))
3073 goto nla_put_failure;
ef2c7d7b
ND		 3074 if (rt->rt6i_flags & RTF_REJECT) {
3075 switch (rt->dst.error) {
3076 case -EINVAL:
3077 rtm->rtm_type = RTN_BLACKHOLE;
3078 break;
3079 case -EACCES:
3080 rtm->rtm_type = RTN_PROHIBIT;
3081 break;
b4949ab2
ND		 3082 case -EAGAIN:
3083 rtm->rtm_type = RTN_THROW;
3084 break;
ef2c7d7b
ND		 3085 default:
3086 rtm->rtm_type = RTN_UNREACHABLE;
3087 break;
3088 }
3089 }
38308473 3090 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3091 rtm->rtm_type = RTN_LOCAL;
d1918542 3092 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3093 rtm->rtm_type = RTN_LOCAL;
3094 else
3095 rtm->rtm_type = RTN_UNICAST;
3096 rtm->rtm_flags = 0;
35103d11 3097 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3098 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3099 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3100 rtm->rtm_flags |= RTNH_F_DEAD;
3101 }
1da177e4
LT		 3102 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3103 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3104 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3105 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3106 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3107 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3108 rtm->rtm_protocol = RTPROT_RA;
3109 else
3110 rtm->rtm_protocol = RTPROT_KERNEL;
3111 }
1da177e4 3112
38308473 3113 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3114 rtm->rtm_flags |= RTM_F_CLONED;
3115
3116 if (dst) {
930345ea 3117 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3118 goto nla_put_failure;
1ab1457c 3119 rtm->rtm_dst_len = 128;
1da177e4 3120 } else if (rtm->rtm_dst_len)
930345ea 3121 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3122 goto nla_put_failure;
1da177e4
LT		 3123#ifdef CONFIG_IPV6_SUBTREES
3124 if (src) {
930345ea 3125 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3126 goto nla_put_failure;
1ab1457c 3127 rtm->rtm_src_len = 128;
c78679e8 3128 } else if (rtm->rtm_src_len &&
930345ea 3129 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3130 goto nla_put_failure;
1da177e4 3131#endif
7bc570c8
YH		 3132 if (iif) {
3133#ifdef CONFIG_IPV6_MROUTE
3134 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3135 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3136 if (err <= 0) {
3137 if (!nowait) {
3138 if (err == 0)
3139 return 0;
3140 goto nla_put_failure;
3141 } else {
3142 if (err == -EMSGSIZE)
3143 goto nla_put_failure;
3144 }
3145 }
3146 } else
3147#endif
c78679e8
DM		 3148 if (nla_put_u32(skb, RTA_IIF, iif))
3149 goto nla_put_failure;
7bc570c8 3150 } else if (dst) {
1da177e4 3151 struct in6_addr saddr_buf;
c78679e8 3152 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3153 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3154 goto nla_put_failure;
1da177e4 3155 }
2d7202bf 3156
c3968a85
DW		 3157 if (rt->rt6i_prefsrc.plen) {
3158 struct in6_addr saddr_buf;
4e3fd7a0 3159 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3160 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3161 goto nla_put_failure;
c3968a85
DW		 3162 }
3163
4b32b5ad
MKL		 3164 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3165 if (rt->rt6i_pmtu)
3166 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3167 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3168 goto nla_put_failure;
3169
dd0cbf29 3170 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3171 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3172 goto nla_put_failure;
94f826b8 3173 }
2d7202bf 3174
c78679e8
DM		 3175 if (rt->dst.dev &&
3176 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3177 goto nla_put_failure;
3178 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3179 goto nla_put_failure;
8253947e
LW		 3180
3181 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3182
87a50699 3183 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3184 goto nla_put_failure;
2d7202bf 3185
c78ba6d6
LR		 3186 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3187 goto nla_put_failure;
3188
61adedf3 3189 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3190
053c095a
JB		 3191 nlmsg_end(skb, nlh);
3192 return 0;
2d7202bf
TG		 3193
3194nla_put_failure:
26932566
PM		 3195 nlmsg_cancel(skb, nlh);
3196 return -EMSGSIZE;
1da177e4
LT		 3197}
3198
1b43af54 3199int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3200{
3201 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3202 int prefix;
3203
2d7202bf
TG		 3204 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3205 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3206 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3207 } else
3208 prefix = 0;
3209
191cd582
BH		 3210 return rt6_fill_node(arg->net,
3211 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3212 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3213 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3214}
3215
67ba4152 3216static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3217{
3b1e0a65 3218 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3219 struct nlattr *tb[RTA_MAX+1];
3220 struct rt6_info *rt;
1da177e4 3221 struct sk_buff *skb;
ab364a6f 3222 struct rtmsg *rtm;
4c9483b2 3223 struct flowi6 fl6;
72331bc0 3224 int err, iif = 0, oif = 0;
1da177e4 3225
ab364a6f
TG		 3226 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3227 if (err < 0)
3228 goto errout;
1da177e4 3229
ab364a6f 3230 err = -EINVAL;
4c9483b2 3231 memset(&fl6, 0, sizeof(fl6));
1da177e4 3232
ab364a6f
TG		 3233 if (tb[RTA_SRC]) {
3234 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3235 goto errout;
3236
4e3fd7a0 3237 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3238 }
3239
3240 if (tb[RTA_DST]) {
3241 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3242 goto errout;
3243
4e3fd7a0 3244 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3245 }
3246
3247 if (tb[RTA_IIF])
3248 iif = nla_get_u32(tb[RTA_IIF]);
3249
3250 if (tb[RTA_OIF])
72331bc0 3251 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3252
2e47b291
LC		 3253 if (tb[RTA_MARK])
3254 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3255
1da177e4
LT		 3256 if (iif) {
3257 struct net_device *dev;
72331bc0
SL		 3258 int flags = 0;
3259
5578689a 3260 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3261 if (!dev) {
3262 err = -ENODEV;
ab364a6f 3263 goto errout;
1da177e4 3264 }
72331bc0
SL		 3265
3266 fl6.flowi6_iif = iif;
3267
3268 if (!ipv6_addr_any(&fl6.saddr))
3269 flags |= RT6_LOOKUP_F_HAS_SADDR;
3270
3271 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3272 flags);
3273 } else {
3274 fl6.flowi6_oif = oif;
3275
3276 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3277 }
3278
ab364a6f 3279 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3280 if (!skb) {
94e187c0 3281 ip6_rt_put(rt);
ab364a6f
TG		 3282 err = -ENOBUFS;
3283 goto errout;
3284 }
1da177e4 3285
ab364a6f
TG		 3286 /* Reserve room for dummy headers, this skb can pass
3287 through good chunk of routing engine.
3288 */
459a98ed 3289 skb_reset_mac_header(skb);
ab364a6f 3290 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3291
d8d1f30b 3292 skb_dst_set(skb, &rt->dst);
1da177e4 3293
4c9483b2 3294 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3295 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3296 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3297 if (err < 0) {
ab364a6f
TG		 3298 kfree_skb(skb);
3299 goto errout;
1da177e4
LT		 3300 }
3301
15e47304 3302 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3303errout:
1da177e4 3304 return err;
1da177e4
LT		 3305}
3306
37a1d361
RP		 3307void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3308 unsigned int nlm_flags)
1da177e4
LT		 3309{
3310 struct sk_buff *skb;
5578689a 3311 struct net *net = info->nl_net;
528c4ceb
DL		 3312 u32 seq;
3313 int err;
3314
3315 err = -ENOBUFS;
38308473 3316 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3317
19e42e45 3318 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3319 if (!skb)
21713ebc
TG		 3320 goto errout;
3321
191cd582 3322 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3323 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3324 if (err < 0) {
3325 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3326 WARN_ON(err == -EMSGSIZE);
3327 kfree_skb(skb);
3328 goto errout;
3329 }
15e47304 3330 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3331 info->nlh, gfp_any());
3332 return;
21713ebc
TG		 3333errout:
3334 if (err < 0)
5578689a 3335 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3336}
3337
8ed67789 3338static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3339 unsigned long event, void *ptr)
8ed67789 3340{
351638e7 3341 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3342 struct net *net = dev_net(dev);
8ed67789
DL		 3343
3344 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3345 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3346 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3347#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3348 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3349 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3350 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3351 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3352#endif
3353 }
3354
3355 return NOTIFY_OK;
3356}
3357
1da177e4
LT		 3358/*
3359 * /proc
3360 */
3361
3362#ifdef CONFIG_PROC_FS
3363
33120b30
AD		 3364static const struct file_operations ipv6_route_proc_fops = {
3365 .owner = THIS_MODULE,
3366 .open = ipv6_route_open,
3367 .read = seq_read,
3368 .llseek = seq_lseek,
8d2ca1d7 3369 .release = seq_release_net,
33120b30
AD		 3370};
3371
1da177e4
LT		 3372static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3373{
69ddb805 3374 struct net *net = (struct net *)seq->private;
1da177e4 3375 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3376 net->ipv6.rt6_stats->fib_nodes,
3377 net->ipv6.rt6_stats->fib_route_nodes,
3378 net->ipv6.rt6_stats->fib_rt_alloc,
3379 net->ipv6.rt6_stats->fib_rt_entries,
3380 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3381 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3382 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3383
3384 return 0;
3385}
3386
3387static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3388{
de05c557 3389 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3390}
3391
9a32144e 3392static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3393 .owner = THIS_MODULE,
3394 .open = rt6_stats_seq_open,
3395 .read = seq_read,
3396 .llseek = seq_lseek,
b6fcbdb4 3397 .release = single_release_net,
1da177e4
LT		 3398};
3399#endif /* CONFIG_PROC_FS */
3400
3401#ifdef CONFIG_SYSCTL
3402
1da177e4 3403static
fe2c6338 3404int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3405 void __user *buffer, size_t *lenp, loff_t *ppos)
3406{
c486da34
LAG		 3407 struct net *net;
3408 int delay;
3409 if (!write)
1da177e4 3410 return -EINVAL;
c486da34
LAG		 3411
3412 net = (struct net *)ctl->extra1;
3413 delay = net->ipv6.sysctl.flush_delay;
3414 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3415 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3416 return 0;
1da177e4
LT		 3417}
3418
fe2c6338 3419struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3420 {
1da177e4 3421 .procname = "flush",
4990509f 3422 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3423 .maxlen = sizeof(int),
89c8b3a1 3424 .mode = 0200,
6d9f239a 3425 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3426 },
3427 {
1da177e4 3428 .procname = "gc_thresh",
9a7ec3a9 3429 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3430 .maxlen = sizeof(int),
3431 .mode = 0644,
6d9f239a 3432 .proc_handler = proc_dointvec,
1da177e4
LT		 3433 },
3434 {
1da177e4 3435 .procname = "max_size",
4990509f 3436 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3437 .maxlen = sizeof(int),
3438 .mode = 0644,
6d9f239a 3439 .proc_handler = proc_dointvec,
1da177e4
LT		 3440 },
3441 {
1da177e4 3442 .procname = "gc_min_interval",
4990509f 3443 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3444 .maxlen = sizeof(int),
3445 .mode = 0644,
6d9f239a 3446 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3447 },
3448 {
1da177e4 3449 .procname = "gc_timeout",
4990509f 3450 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3451 .maxlen = sizeof(int),
3452 .mode = 0644,
6d9f239a 3453 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3454 },
3455 {
1da177e4 3456 .procname = "gc_interval",
4990509f 3457 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3458 .maxlen = sizeof(int),
3459 .mode = 0644,
6d9f239a 3460 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3461 },
3462 {
1da177e4 3463 .procname = "gc_elasticity",
4990509f 3464 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3465 .maxlen = sizeof(int),
3466 .mode = 0644,
f3d3f616 3467 .proc_handler = proc_dointvec,
1da177e4
LT		 3468 },
3469 {
1da177e4 3470 .procname = "mtu_expires",
4990509f 3471 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3472 .maxlen = sizeof(int),
3473 .mode = 0644,
6d9f239a 3474 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3475 },
3476 {
1da177e4 3477 .procname = "min_adv_mss",
4990509f 3478 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3479 .maxlen = sizeof(int),
3480 .mode = 0644,
f3d3f616 3481 .proc_handler = proc_dointvec,
1da177e4
LT		 3482 },
3483 {
1da177e4 3484 .procname = "gc_min_interval_ms",
4990509f 3485 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3486 .maxlen = sizeof(int),
3487 .mode = 0644,
6d9f239a 3488 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3489 },
f8572d8f 3490 { }
1da177e4
LT		 3491};
3492
2c8c1e72 3493struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3494{
3495 struct ctl_table *table;
3496
3497 table = kmemdup(ipv6_route_table_template,
3498 sizeof(ipv6_route_table_template),
3499 GFP_KERNEL);
5ee09105
YH		 3500
3501 if (table) {
3502 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3503 table[0].extra1 = net;
86393e52 3504 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3505 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3506 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3507 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3508 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3509 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3510 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3511 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3512 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3513
3514 /* Don't export sysctls to unprivileged users */
3515 if (net->user_ns != &init_user_ns)
3516 table[0].procname = NULL;
5ee09105
YH		 3517 }
3518
760f2d01
DL		 3519 return table;
3520}
1da177e4
LT		 3521#endif
3522
2c8c1e72 3523static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3524{
633d424b 3525 int ret = -ENOMEM;
8ed67789 3526
86393e52
AD		 3527 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3528 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3529
fc66f95c
ED		 3530 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3531 goto out_ip6_dst_ops;
3532
8ed67789
DL		 3533 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3534 sizeof(*net->ipv6.ip6_null_entry),
3535 GFP_KERNEL);
3536 if (!net->ipv6.ip6_null_entry)
fc66f95c 3537 goto out_ip6_dst_entries;
d8d1f30b 3538 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3539 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3540 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3541 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3542 ip6_template_metrics, true);
8ed67789
DL		 3543
3544#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3545 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3546 sizeof(*net->ipv6.ip6_prohibit_entry),
3547 GFP_KERNEL);
68fffc67
PZ		 3548 if (!net->ipv6.ip6_prohibit_entry)
3549 goto out_ip6_null_entry;
d8d1f30b 3550 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3551 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3552 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3553 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3554 ip6_template_metrics, true);
8ed67789
DL		 3555
3556 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3557 sizeof(*net->ipv6.ip6_blk_hole_entry),
3558 GFP_KERNEL);
68fffc67
PZ		 3559 if (!net->ipv6.ip6_blk_hole_entry)
3560 goto out_ip6_prohibit_entry;
d8d1f30b 3561 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3562 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3563 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3564 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3565 ip6_template_metrics, true);
8ed67789
DL		 3566#endif
3567
b339a47c
PZ		 3568 net->ipv6.sysctl.flush_delay = 0;
3569 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3570 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3571 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3572 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3573 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3574 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3575 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3576
6891a346
BT		 3577 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3578
8ed67789
DL		 3579 ret = 0;
3580out:
3581 return ret;
f2fc6a54 3582
68fffc67
PZ		 3583#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3584out_ip6_prohibit_entry:
3585 kfree(net->ipv6.ip6_prohibit_entry);
3586out_ip6_null_entry:
3587 kfree(net->ipv6.ip6_null_entry);
3588#endif
fc66f95c
ED		 3589out_ip6_dst_entries:
3590 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3591out_ip6_dst_ops:
f2fc6a54 3592 goto out;
cdb18761
DL		 3593}
3594
2c8c1e72 3595static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3596{
8ed67789
DL		 3597 kfree(net->ipv6.ip6_null_entry);
3598#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3599 kfree(net->ipv6.ip6_prohibit_entry);
3600 kfree(net->ipv6.ip6_blk_hole_entry);
3601#endif
41bb78b4 3602 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3603}
3604
d189634e
TG		 3605static int __net_init ip6_route_net_init_late(struct net *net)
3606{
3607#ifdef CONFIG_PROC_FS
d4beaa66
G		 3608 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3609 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3610#endif
3611 return 0;
3612}
3613
3614static void __net_exit ip6_route_net_exit_late(struct net *net)
3615{
3616#ifdef CONFIG_PROC_FS
ece31ffd
G		 3617 remove_proc_entry("ipv6_route", net->proc_net);
3618 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3619#endif
3620}
3621
cdb18761
DL		 3622static struct pernet_operations ip6_route_net_ops = {
3623 .init = ip6_route_net_init,
3624 .exit = ip6_route_net_exit,
3625};
3626
c3426b47
DM		 3627static int __net_init ipv6_inetpeer_init(struct net *net)
3628{
3629 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3630
3631 if (!bp)
3632 return -ENOMEM;
3633 inet_peer_base_init(bp);
3634 net->ipv6.peers = bp;
3635 return 0;
3636}
3637
3638static void __net_exit ipv6_inetpeer_exit(struct net *net)
3639{
3640 struct inet_peer_base *bp = net->ipv6.peers;
3641
3642 net->ipv6.peers = NULL;
56a6b248 3643 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3644 kfree(bp);
3645}
3646
2b823f72 3647static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3648 .init = ipv6_inetpeer_init,
3649 .exit = ipv6_inetpeer_exit,
3650};
3651
d189634e
TG		 3652static struct pernet_operations ip6_route_net_late_ops = {
3653 .init = ip6_route_net_init_late,
3654 .exit = ip6_route_net_exit_late,
3655};
3656
8ed67789
DL		 3657static struct notifier_block ip6_route_dev_notifier = {
3658 .notifier_call = ip6_route_dev_notify,
3659 .priority = 0,
3660};
3661
433d49c3 3662int __init ip6_route_init(void)
1da177e4 3663{
433d49c3 3664 int ret;
8d0b94af 3665 int cpu;
433d49c3 3666
9a7ec3a9
DL		 3667 ret = -ENOMEM;
3668 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3669 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3670 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3671 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3672 goto out;
14e50e57 3673
fc66f95c 3674 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3675 if (ret)
bdb3289f 3676 goto out_kmem_cache;
bdb3289f 3677
c3426b47
DM		 3678 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3679 if (ret)
e8803b6c 3680 goto out_dst_entries;
2a0c451a 3681
7e52b33b
DM		 3682 ret = register_pernet_subsys(&ip6_route_net_ops);
3683 if (ret)
3684 goto out_register_inetpeer;
c3426b47 3685
5dc121e9
AE		 3686 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3687
8ed67789
DL		 3688 /* Registering of the loopback is done before this portion of code,
3689 * the loopback reference in rt6_info will not be taken, do it
3690 * manually for init_net */
d8d1f30b 3691 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3692 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3693 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3694 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3695 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3696 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3697 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3698 #endif
e8803b6c 3699 ret = fib6_init();
433d49c3 3700 if (ret)
8ed67789 3701 goto out_register_subsys;
433d49c3 3702
433d49c3
DL		 3703 ret = xfrm6_init();
3704 if (ret)
e8803b6c 3705 goto out_fib6_init;
c35b7e72 3706
433d49c3
DL		 3707 ret = fib6_rules_init();
3708 if (ret)
3709 goto xfrm6_init;
7e5449c2 3710
d189634e
TG		 3711 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3712 if (ret)
3713 goto fib6_rules_init;
3714
433d49c3 3715 ret = -ENOBUFS;
c7ac8679
GR		 3716 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3717 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3718 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3719 goto out_register_late_subsys;
c127ea2c 3720
8ed67789 3721 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3722 if (ret)
d189634e 3723 goto out_register_late_subsys;
8ed67789 3724
8d0b94af
MKL		 3725 for_each_possible_cpu(cpu) {
3726 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3727
3728 INIT_LIST_HEAD(&ul->head);
3729 spin_lock_init(&ul->lock);
3730 }
3731
433d49c3
DL		 3732out:
3733 return ret;
3734
d189634e
TG		 3735out_register_late_subsys:
3736 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3737fib6_rules_init:
433d49c3
DL		 3738 fib6_rules_cleanup();
3739xfrm6_init:
433d49c3 3740 xfrm6_fini();
2a0c451a
TG		 3741out_fib6_init:
3742 fib6_gc_cleanup();
8ed67789
DL		 3743out_register_subsys:
3744 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3745out_register_inetpeer:
3746 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3747out_dst_entries:
3748 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3749out_kmem_cache:
f2fc6a54 3750 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3751 goto out;
1da177e4
LT		 3752}
3753
3754void ip6_route_cleanup(void)
3755{
8ed67789 3756 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3757 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3758 fib6_rules_cleanup();
1da177e4 3759 xfrm6_fini();
1da177e4 3760 fib6_gc_cleanup();
c3426b47 3761 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3762 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3763 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3764 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3765}
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