projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ebpf: fix fd refcount leaks related to maps in bpf syscall
[deliverable/linux.git] / net / ipv6 / route.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1da177e4
LT		 8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14/* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
c0bece9f
YH		 23 * Ville Nuorvala
24 * Fixed routing subtrees.
1da177e4
LT		 25 */
26
f3213831
JP		 27#define pr_fmt(fmt) "IPv6: " fmt
28
4fc268d2 29#include <linux/capability.h>
1da177e4 30#include <linux/errno.h>
bc3b2d7f 31#include <linux/export.h>
1da177e4
LT		 32#include <linux/types.h>
33#include <linux/times.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/net.h>
37#include <linux/route.h>
38#include <linux/netdevice.h>
39#include <linux/in6.h>
7bc570c8 40#include <linux/mroute6.h>
1da177e4 41#include <linux/init.h>
1da177e4 42#include <linux/if_arp.h>
1da177e4
LT		 43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
5b7c931d 45#include <linux/nsproxy.h>
5a0e3ad6 46#include <linux/slab.h>
457c4cbc 47#include <net/net_namespace.h>
1da177e4
LT		 48#include <net/snmp.h>
49#include <net/ipv6.h>
50#include <net/ip6_fib.h>
51#include <net/ip6_route.h>
52#include <net/ndisc.h>
53#include <net/addrconf.h>
54#include <net/tcp.h>
55#include <linux/rtnetlink.h>
56#include <net/dst.h>
904af04d 57#include <net/dst_metadata.h>
1da177e4 58#include <net/xfrm.h>
8d71740c 59#include <net/netevent.h>
21713ebc 60#include <net/netlink.h>
51ebd318 61#include <net/nexthop.h>
19e42e45 62#include <net/lwtunnel.h>
904af04d 63#include <net/ip_tunnels.h>
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);
1325 if (ip6_del_rt(rt))
1326 dst_free(&rt->dst);
1327 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1328 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1329 }
1da177e4
LT		 1330 }
1331}
1332
45e4fd26
MKL		 1333static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1334{
1335 struct net *net = dev_net(rt->dst.dev);
1336
1337 rt->rt6i_flags |= RTF_MODIFIED;
1338 rt->rt6i_pmtu = mtu;
1339 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1340}
1341
1342static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1343 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1344{
67ba4152 1345 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1346
45e4fd26
MKL		 1347 if (rt6->rt6i_flags & RTF_LOCAL)
1348 return;
81aded24 1349
45e4fd26
MKL		 1350 dst_confirm(dst);
1351 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1352 if (mtu >= dst_mtu(dst))
1353 return;
9d289715 1354
45e4fd26
MKL		 1355 if (rt6->rt6i_flags & RTF_CACHE) {
1356 rt6_do_update_pmtu(rt6, mtu);
1357 } else {
1358 const struct in6_addr *daddr, *saddr;
1359 struct rt6_info *nrt6;
1360
1361 if (iph) {
1362 daddr = &iph->daddr;
1363 saddr = &iph->saddr;
1364 } else if (sk) {
1365 daddr = &sk->sk_v6_daddr;
1366 saddr = &inet6_sk(sk)->saddr;
1367 } else {
1368 return;
1369 }
1370 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1371 if (nrt6) {
1372 rt6_do_update_pmtu(nrt6, mtu);
1373
1374 /* ip6_ins_rt(nrt6) will bump the
1375 * rt6->rt6i_node->fn_sernum
1376 * which will fail the next rt6_check() and
1377 * invalidate the sk->sk_dst_cache.
1378 */
1379 ip6_ins_rt(nrt6);
1380 }
1da177e4
LT		 1381 }
1382}
1383
45e4fd26
MKL		 1384static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1385 struct sk_buff *skb, u32 mtu)
1386{
1387 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1388}
1389
42ae66c8
DM		 1390void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1391 int oif, u32 mark)
81aded24
DM		 1392{
1393 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1394 struct dst_entry *dst;
1395 struct flowi6 fl6;
1396
1397 memset(&fl6, 0, sizeof(fl6));
1398 fl6.flowi6_oif = oif;
1b3c61dc 1399 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1400 fl6.daddr = iph->daddr;
1401 fl6.saddr = iph->saddr;
6502ca52 1402 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1403
1404 dst = ip6_route_output(net, NULL, &fl6);
1405 if (!dst->error)
45e4fd26 1406 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1407 dst_release(dst);
1408}
1409EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1410
1411void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1412{
1413 ip6_update_pmtu(skb, sock_net(sk), mtu,
1414 sk->sk_bound_dev_if, sk->sk_mark);
1415}
1416EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1417
b55b76b2
DJ		 1418/* Handle redirects */
1419struct ip6rd_flowi {
1420 struct flowi6 fl6;
1421 struct in6_addr gateway;
1422};
1423
1424static struct rt6_info *__ip6_route_redirect(struct net *net,
1425 struct fib6_table *table,
1426 struct flowi6 *fl6,
1427 int flags)
1428{
1429 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1430 struct rt6_info *rt;
1431 struct fib6_node *fn;
1432
1433 /* Get the "current" route for this destination and
1434 * check if the redirect has come from approriate router.
1435 *
1436 * RFC 4861 specifies that redirects should only be
1437 * accepted if they come from the nexthop to the target.
1438 * Due to the way the routes are chosen, this notion
1439 * is a bit fuzzy and one might need to check all possible
1440 * routes.
1441 */
1442
1443 read_lock_bh(&table->tb6_lock);
1444 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1445restart:
1446 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1447 if (rt6_check_expired(rt))
1448 continue;
1449 if (rt->dst.error)
1450 break;
1451 if (!(rt->rt6i_flags & RTF_GATEWAY))
1452 continue;
1453 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1454 continue;
1455 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1456 continue;
1457 break;
1458 }
1459
1460 if (!rt)
1461 rt = net->ipv6.ip6_null_entry;
1462 else if (rt->dst.error) {
1463 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1464 goto out;
1465 }
1466
1467 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1468 fn = fib6_backtrack(fn, &fl6->saddr);
1469 if (fn)
1470 goto restart;
b55b76b2 1471 }
a3c00e46 1472
b0a1ba59 1473out:
b55b76b2
DJ		 1474 dst_hold(&rt->dst);
1475
1476 read_unlock_bh(&table->tb6_lock);
1477
1478 return rt;
1479};
1480
1481static struct dst_entry *ip6_route_redirect(struct net *net,
1482 const struct flowi6 *fl6,
1483 const struct in6_addr *gateway)
1484{
1485 int flags = RT6_LOOKUP_F_HAS_SADDR;
1486 struct ip6rd_flowi rdfl;
1487
1488 rdfl.fl6 = *fl6;
1489 rdfl.gateway = *gateway;
1490
1491 return fib6_rule_lookup(net, &rdfl.fl6,
1492 flags, __ip6_route_redirect);
1493}
1494
3a5ad2ee
DM		 1495void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1496{
1497 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1498 struct dst_entry *dst;
1499 struct flowi6 fl6;
1500
1501 memset(&fl6, 0, sizeof(fl6));
e374c618 1502 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1503 fl6.flowi6_oif = oif;
1504 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1505 fl6.daddr = iph->daddr;
1506 fl6.saddr = iph->saddr;
6502ca52 1507 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1508
b55b76b2
DJ		 1509 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1510 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1511 dst_release(dst);
1512}
1513EXPORT_SYMBOL_GPL(ip6_redirect);
1514
c92a59ec
DJ		 1515void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1516 u32 mark)
1517{
1518 const struct ipv6hdr *iph = ipv6_hdr(skb);
1519 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1520 struct dst_entry *dst;
1521 struct flowi6 fl6;
1522
1523 memset(&fl6, 0, sizeof(fl6));
e374c618 1524 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1525 fl6.flowi6_oif = oif;
1526 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1527 fl6.daddr = msg->dest;
1528 fl6.saddr = iph->daddr;
1529
b55b76b2
DJ		 1530 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1531 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1532 dst_release(dst);
1533}
1534
3a5ad2ee
DM		 1535void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1536{
1537 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1538}
1539EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1540
0dbaee3b 1541static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1542{
0dbaee3b
DM		 1543 struct net_device *dev = dst->dev;
1544 unsigned int mtu = dst_mtu(dst);
1545 struct net *net = dev_net(dev);
1546
1da177e4
LT		 1547 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1548
5578689a
DL		 1549 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1550 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1551
1552 /*
1ab1457c
YH		 1553 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1554 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1555 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1556 * rely only on pmtu discovery"
1557 */
1558 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1559 mtu = IPV6_MAXPLEN;
1560 return mtu;
1561}
1562
ebb762f2 1563static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1564{
4b32b5ad
MKL		 1565 const struct rt6_info *rt = (const struct rt6_info *)dst;
1566 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1567 struct inet6_dev *idev;
618f9bc7 1568
4b32b5ad
MKL		 1569 if (mtu)
1570 goto out;
1571
1572 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1573 if (mtu)
30f78d8e 1574 goto out;
618f9bc7
SK		 1575
1576 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1577
1578 rcu_read_lock();
1579 idev = __in6_dev_get(dst->dev);
1580 if (idev)
1581 mtu = idev->cnf.mtu6;
1582 rcu_read_unlock();
1583
30f78d8e
ED		 1584out:
1585 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1586}
1587
3b00944c
YH		 1588static struct dst_entry *icmp6_dst_gc_list;
1589static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1590
3b00944c 1591struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1592 struct flowi6 *fl6)
1da177e4 1593{
87a11578 1594 struct dst_entry *dst;
1da177e4
LT		 1595 struct rt6_info *rt;
1596 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1597 struct net *net = dev_net(dev);
1da177e4 1598
38308473 1599 if (unlikely(!idev))
122bdf67 1600 return ERR_PTR(-ENODEV);
1da177e4 1601
ad706862 1602 rt = ip6_dst_alloc(net, dev, 0);
38308473 1603 if (unlikely(!rt)) {
1da177e4 1604 in6_dev_put(idev);
87a11578 1605 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1606 goto out;
1607 }
1608
8e2ec639
YZ		 1609 rt->dst.flags |= DST_HOST;
1610 rt->dst.output = ip6_output;
d8d1f30b 1611 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1612 rt->rt6i_gateway = fl6->daddr;
87a11578 1613 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1614 rt->rt6i_dst.plen = 128;
1615 rt->rt6i_idev = idev;
14edd87d 1616 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1617
3b00944c 1618 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1619 rt->dst.next = icmp6_dst_gc_list;
1620 icmp6_dst_gc_list = &rt->dst;
3b00944c 1621 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1622
5578689a 1623 fib6_force_start_gc(net);
1da177e4 1624
87a11578
DM		 1625 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1626
1da177e4 1627out:
87a11578 1628 return dst;
1da177e4
LT		 1629}
1630
3d0f24a7 1631int icmp6_dst_gc(void)
1da177e4 1632{
e9476e95 1633 struct dst_entry *dst, **pprev;
3d0f24a7 1634 int more = 0;
1da177e4 1635
3b00944c
YH		 1636 spin_lock_bh(&icmp6_dst_lock);
1637 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1638
1da177e4
LT		 1639 while ((dst = *pprev) != NULL) {
1640 if (!atomic_read(&dst->__refcnt)) {
1641 *pprev = dst->next;
1642 dst_free(dst);
1da177e4
LT		 1643 } else {
1644 pprev = &dst->next;
3d0f24a7 1645 ++more;
1da177e4
LT		 1646 }
1647 }
1648
3b00944c 1649 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1650
3d0f24a7 1651 return more;
1da177e4
LT		 1652}
1653
1e493d19
DM		 1654static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1655 void *arg)
1656{
1657 struct dst_entry *dst, **pprev;
1658
1659 spin_lock_bh(&icmp6_dst_lock);
1660 pprev = &icmp6_dst_gc_list;
1661 while ((dst = *pprev) != NULL) {
1662 struct rt6_info *rt = (struct rt6_info *) dst;
1663 if (func(rt, arg)) {
1664 *pprev = dst->next;
1665 dst_free(dst);
1666 } else {
1667 pprev = &dst->next;
1668 }
1669 }
1670 spin_unlock_bh(&icmp6_dst_lock);
1671}
1672
569d3645 1673static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1674{
86393e52 1675 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1676 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1677 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1678 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1679 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1680 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1681 int entries;
7019b78e 1682
fc66f95c 1683 entries = dst_entries_get_fast(ops);
49a18d86 1684 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1685 entries <= rt_max_size)
1da177e4
LT		 1686 goto out;
1687
6891a346 1688 net->ipv6.ip6_rt_gc_expire++;
14956643 1689 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1690 entries = dst_entries_get_slow(ops);
1691 if (entries < ops->gc_thresh)
7019b78e 1692 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1693out:
7019b78e 1694 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1695 return entries > rt_max_size;
1da177e4
LT		 1696}
1697
e715b6d3
FW		 1698static int ip6_convert_metrics(struct mx6_config *mxc,
1699 const struct fib6_config *cfg)
1700{
c3a8d947 1701 bool ecn_ca = false;
e715b6d3
FW		 1702 struct nlattr *nla;
1703 int remaining;
1704 u32 *mp;
1705
63159f29 1706 if (!cfg->fc_mx)
e715b6d3
FW		 1707 return 0;
1708
1709 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1710 if (unlikely(!mp))
1711 return -ENOMEM;
1712
1713 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1714 int type = nla_type(nla);
1bb14807 1715 u32 val;
e715b6d3 1716
1bb14807
DB		 1717 if (!type)
1718 continue;
1719 if (unlikely(type > RTAX_MAX))
1720 goto err;
ea697639 1721
1bb14807
DB		 1722 if (type == RTAX_CC_ALGO) {
1723 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1724
1bb14807 1725 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1726 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1727 if (val == TCP_CA_UNSPEC)
1728 goto err;
1729 } else {
1730 val = nla_get_u32(nla);
e715b6d3 1731 }
b8d3e416
DB		 1732 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1733 goto err;
1bb14807
DB		 1734
1735 mp[type - 1] = val;
1736 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1737 }
1738
c3a8d947
DB		 1739 if (ecn_ca) {
1740 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1741 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1742 }
e715b6d3 1743
c3a8d947 1744 mxc->mx = mp;
e715b6d3
FW		 1745 return 0;
1746 err:
1747 kfree(mp);
1748 return -EINVAL;
1749}
1da177e4 1750
86872cb5 1751int ip6_route_add(struct fib6_config *cfg)
1da177e4
LT		 1752{
1753 int err;
5578689a 1754 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1755 struct rt6_info *rt = NULL;
1756 struct net_device *dev = NULL;
1757 struct inet6_dev *idev = NULL;
c71099ac 1758 struct fib6_table *table;
e715b6d3 1759 struct mx6_config mxc = { .mx = NULL, };
1da177e4
LT		 1760 int addr_type;
1761
86872cb5 1762 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1da177e4
LT		 1763 return -EINVAL;
1764#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1765 if (cfg->fc_src_len)
1da177e4
LT		 1766 return -EINVAL;
1767#endif
86872cb5 1768 if (cfg->fc_ifindex) {
1da177e4 1769 err = -ENODEV;
5578689a 1770 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1771 if (!dev)
1772 goto out;
1773 idev = in6_dev_get(dev);
1774 if (!idev)
1775 goto out;
1776 }
1777
86872cb5
TG		 1778 if (cfg->fc_metric == 0)
1779 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1780
d71314b4 1781 err = -ENOBUFS;
38308473
DM		 1782 if (cfg->fc_nlinfo.nlh &&
1783 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1784 table = fib6_get_table(net, cfg->fc_table);
38308473 1785 if (!table) {
f3213831 1786 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1787 table = fib6_new_table(net, cfg->fc_table);
1788 }
1789 } else {
1790 table = fib6_new_table(net, cfg->fc_table);
1791 }
38308473
DM		 1792
1793 if (!table)
c71099ac 1794 goto out;
c71099ac 1795
ad706862
MKL		 1796 rt = ip6_dst_alloc(net, NULL,
1797 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1798
38308473 1799 if (!rt) {
1da177e4
LT		 1800 err = -ENOMEM;
1801 goto out;
1802 }
1803
1716a961
G		 1804 if (cfg->fc_flags & RTF_EXPIRES)
1805 rt6_set_expires(rt, jiffies +
1806 clock_t_to_jiffies(cfg->fc_expires));
1807 else
1808 rt6_clean_expires(rt);
1da177e4 1809
86872cb5
TG		 1810 if (cfg->fc_protocol == RTPROT_UNSPEC)
1811 cfg->fc_protocol = RTPROT_BOOT;
1812 rt->rt6i_protocol = cfg->fc_protocol;
1813
1814 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1815
1816 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1817 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1818 else if (cfg->fc_flags & RTF_LOCAL)
1819 rt->dst.input = ip6_input;
1da177e4 1820 else
d8d1f30b 1821 rt->dst.input = ip6_forward;
1da177e4 1822
d8d1f30b 1823 rt->dst.output = ip6_output;
1da177e4 1824
19e42e45
RP		 1825 if (cfg->fc_encap) {
1826 struct lwtunnel_state *lwtstate;
1827
1828 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1829 cfg->fc_encap, AF_INET6, cfg,
1830 &lwtstate);
19e42e45
RP		 1831 if (err)
1832 goto out;
61adedf3
JB		 1833 rt->dst.lwtstate = lwtstate_get(lwtstate);
1834 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1835 rt->dst.lwtstate->orig_output = rt->dst.output;
1836 rt->dst.output = lwtunnel_output;
25368623 1837 }
61adedf3
JB		 1838 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1839 rt->dst.lwtstate->orig_input = rt->dst.input;
1840 rt->dst.input = lwtunnel_input;
25368623 1841 }
19e42e45
RP		 1842 }
1843
86872cb5
TG		 1844 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1845 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1846 if (rt->rt6i_dst.plen == 128)
e5fd387a 1847 rt->dst.flags |= DST_HOST;
e5fd387a 1848
1da177e4 1849#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1850 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1851 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1852#endif
1853
86872cb5 1854 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1855
1856 /* We cannot add true routes via loopback here,
1857 they would result in kernel looping; promote them to reject routes
1858 */
86872cb5 1859 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1860 (dev && (dev->flags & IFF_LOOPBACK) &&
1861 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1862 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1863 /* hold loopback dev/idev if we haven't done so. */
5578689a 1864 if (dev != net->loopback_dev) {
1da177e4
LT		 1865 if (dev) {
1866 dev_put(dev);
1867 in6_dev_put(idev);
1868 }
5578689a 1869 dev = net->loopback_dev;
1da177e4
LT		 1870 dev_hold(dev);
1871 idev = in6_dev_get(dev);
1872 if (!idev) {
1873 err = -ENODEV;
1874 goto out;
1875 }
1876 }
1da177e4 1877 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1878 switch (cfg->fc_type) {
1879 case RTN_BLACKHOLE:
1880 rt->dst.error = -EINVAL;
aad88724 1881 rt->dst.output = dst_discard_sk;
7150aede 1882 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1883 break;
1884 case RTN_PROHIBIT:
1885 rt->dst.error = -EACCES;
7150aede
K		 1886 rt->dst.output = ip6_pkt_prohibit_out;
1887 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1888 break;
b4949ab2 1889 case RTN_THROW:
ef2c7d7b 1890 default:
7150aede
K		 1891 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1892 : -ENETUNREACH;
1893 rt->dst.output = ip6_pkt_discard_out;
1894 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1895 break;
1896 }
1da177e4
LT		 1897 goto install_route;
1898 }
1899
86872cb5 1900 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1901 const struct in6_addr *gw_addr;
1da177e4
LT		 1902 int gwa_type;
1903
86872cb5 1904 gw_addr = &cfg->fc_gateway;
330567b7 1905 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1906
1907 /* if gw_addr is local we will fail to detect this in case
1908 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1909 * will return already-added prefix route via interface that
1910 * prefix route was assigned to, which might be non-loopback.
1911 */
1912 err = -EINVAL;
330567b7
FW		 1913 if (ipv6_chk_addr_and_flags(net, gw_addr,
1914 gwa_type & IPV6_ADDR_LINKLOCAL ?
1915 dev : NULL, 0, 0))
48ed7b26
FW		 1916 goto out;
1917
4e3fd7a0 1918 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1919
1920 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1921 struct rt6_info *grt;
1922
1923 /* IPv6 strictly inhibits using not link-local
1924 addresses as nexthop address.
1925 Otherwise, router will not able to send redirects.
1926 It is very good, but in some (rare!) circumstances
1927 (SIT, PtP, NBMA NOARP links) it is handy to allow
1928 some exceptions. --ANK
1929 */
38308473 1930 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1931 goto out;
1932
5578689a 1933 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1934
1935 err = -EHOSTUNREACH;
38308473 1936 if (!grt)
1da177e4
LT		 1937 goto out;
1938 if (dev) {
d1918542 1939 if (dev != grt->dst.dev) {
94e187c0 1940 ip6_rt_put(grt);
1da177e4
LT		 1941 goto out;
1942 }
1943 } else {
d1918542 1944 dev = grt->dst.dev;
1da177e4
LT		 1945 idev = grt->rt6i_idev;
1946 dev_hold(dev);
1947 in6_dev_hold(grt->rt6i_idev);
1948 }
38308473 1949 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1950 err = 0;
94e187c0 1951 ip6_rt_put(grt);
1da177e4
LT		 1952
1953 if (err)
1954 goto out;
1955 }
1956 err = -EINVAL;
38308473 1957 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1958 goto out;
1959 }
1960
1961 err = -ENODEV;
38308473 1962 if (!dev)
1da177e4
LT		 1963 goto out;
1964
c3968a85
DW		 1965 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1966 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1967 err = -EINVAL;
1968 goto out;
1969 }
4e3fd7a0 1970 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1971 rt->rt6i_prefsrc.plen = 128;
1972 } else
1973 rt->rt6i_prefsrc.plen = 0;
1974
86872cb5 1975 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1976
1977install_route:
d8d1f30b 1978 rt->dst.dev = dev;
1da177e4 1979 rt->rt6i_idev = idev;
c71099ac 1980 rt->rt6i_table = table;
63152fc0 1981
c346dca1 1982 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1983
e715b6d3
FW		 1984 err = ip6_convert_metrics(&mxc, cfg);
1985 if (err)
1986 goto out;
1da177e4 1987
e715b6d3
FW		 1988 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
1989
1990 kfree(mxc.mx);
1991 return err;
1da177e4
LT		 1992out:
1993 if (dev)
1994 dev_put(dev);
1995 if (idev)
1996 in6_dev_put(idev);
1997 if (rt)
d8d1f30b 1998 dst_free(&rt->dst);
1da177e4
LT		 1999 return err;
2000}
2001
86872cb5 2002static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2003{
2004 int err;
c71099ac 2005 struct fib6_table *table;
d1918542 2006 struct net *net = dev_net(rt->dst.dev);
1da177e4 2007
6825a26c
G		 2008 if (rt == net->ipv6.ip6_null_entry) {
2009 err = -ENOENT;
2010 goto out;
2011 }
6c813a72 2012
c71099ac
TG		 2013 table = rt->rt6i_table;
2014 write_lock_bh(&table->tb6_lock);
86872cb5 2015 err = fib6_del(rt, info);
c71099ac 2016 write_unlock_bh(&table->tb6_lock);
1da177e4 2017
6825a26c 2018out:
94e187c0 2019 ip6_rt_put(rt);
1da177e4
LT		 2020 return err;
2021}
2022
e0a1ad73
TG		 2023int ip6_del_rt(struct rt6_info *rt)
2024{
4d1169c1 2025 struct nl_info info = {
d1918542 2026 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2027 };
528c4ceb 2028 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2029}
2030
86872cb5 2031static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2032{
c71099ac 2033 struct fib6_table *table;
1da177e4
LT		 2034 struct fib6_node *fn;
2035 struct rt6_info *rt;
2036 int err = -ESRCH;
2037
5578689a 2038 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2039 if (!table)
c71099ac
TG		 2040 return err;
2041
2042 read_lock_bh(&table->tb6_lock);
1da177e4 2043
c71099ac 2044 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2045 &cfg->fc_dst, cfg->fc_dst_len,
2046 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2047
1da177e4 2048 if (fn) {
d8d1f30b 2049 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2050 if ((rt->rt6i_flags & RTF_CACHE) &&
2051 !(cfg->fc_flags & RTF_CACHE))
2052 continue;
86872cb5 2053 if (cfg->fc_ifindex &&
d1918542
DM		 2054 (!rt->dst.dev ||
2055 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2056 continue;
86872cb5
TG		 2057 if (cfg->fc_flags & RTF_GATEWAY &&
2058 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2059 continue;
86872cb5 2060 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2061 continue;
d8d1f30b 2062 dst_hold(&rt->dst);
c71099ac 2063 read_unlock_bh(&table->tb6_lock);
1da177e4 2064
86872cb5 2065 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2066 }
2067 }
c71099ac 2068 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2069
2070 return err;
2071}
2072
6700c270 2073static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2074{
e8599ff4 2075 struct net *net = dev_net(skb->dev);
a6279458 2076 struct netevent_redirect netevent;
e8599ff4 2077 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2078 struct ndisc_options ndopts;
2079 struct inet6_dev *in6_dev;
2080 struct neighbour *neigh;
71bcdba0 2081 struct rd_msg *msg;
6e157b6a
DM		 2082 int optlen, on_link;
2083 u8 *lladdr;
e8599ff4 2084
29a3cad5 2085 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2086 optlen -= sizeof(*msg);
e8599ff4
DM		 2087
2088 if (optlen < 0) {
6e157b6a 2089 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2090 return;
2091 }
2092
71bcdba0 2093 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2094
71bcdba0 2095 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2096 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2097 return;
2098 }
2099
6e157b6a 2100 on_link = 0;
71bcdba0 2101 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2102 on_link = 1;
71bcdba0 2103 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2104 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2105 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2106 return;
2107 }
2108
2109 in6_dev = __in6_dev_get(skb->dev);
2110 if (!in6_dev)
2111 return;
2112 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2113 return;
2114
2115 /* RFC2461 8.1:
2116 * The IP source address of the Redirect MUST be the same as the current
2117 * first-hop router for the specified ICMP Destination Address.
2118 */
2119
71bcdba0 2120 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2121 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2122 return;
2123 }
6e157b6a
DM		 2124
2125 lladdr = NULL;
e8599ff4
DM		 2126 if (ndopts.nd_opts_tgt_lladdr) {
2127 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2128 skb->dev);
2129 if (!lladdr) {
2130 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2131 return;
2132 }
2133 }
2134
6e157b6a
DM		 2135 rt = (struct rt6_info *) dst;
2136 if (rt == net->ipv6.ip6_null_entry) {
2137 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2138 return;
6e157b6a 2139 }
e8599ff4 2140
6e157b6a
DM		 2141 /* Redirect received -> path was valid.
2142 * Look, redirects are sent only in response to data packets,
2143 * so that this nexthop apparently is reachable. --ANK
2144 */
2145 dst_confirm(&rt->dst);
a6279458 2146
71bcdba0 2147 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2148 if (!neigh)
2149 return;
a6279458 2150
1da177e4
LT		 2151 /*
2152 * We have finally decided to accept it.
2153 */
2154
1ab1457c 2155 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2156 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2157 NEIGH_UPDATE_F_OVERRIDE|
2158 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2159 NEIGH_UPDATE_F_ISROUTER))
2160 );
2161
83a09abd 2162 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2163 if (!nrt)
1da177e4
LT		 2164 goto out;
2165
2166 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2167 if (on_link)
2168 nrt->rt6i_flags &= ~RTF_GATEWAY;
2169
4e3fd7a0 2170 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2171
40e22e8f 2172 if (ip6_ins_rt(nrt))
1da177e4
LT		 2173 goto out;
2174
d8d1f30b
CG		 2175 netevent.old = &rt->dst;
2176 netevent.new = &nrt->dst;
71bcdba0 2177 netevent.daddr = &msg->dest;
60592833 2178 netevent.neigh = neigh;
8d71740c
TT		 2179 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2180
38308473 2181 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2182 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2183 ip6_del_rt(rt);
1da177e4
LT		 2184 }
2185
2186out:
e8599ff4 2187 neigh_release(neigh);
6e157b6a
DM		 2188}
2189
1da177e4
LT		 2190/*
2191 * Misc support functions
2192 */
2193
4b32b5ad
MKL		 2194static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2195{
2196 BUG_ON(from->dst.from);
2197
2198 rt->rt6i_flags &= ~RTF_EXPIRES;
2199 dst_hold(&from->dst);
2200 rt->dst.from = &from->dst;
2201 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2202}
2203
83a09abd
MKL		 2204static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2205{
2206 rt->dst.input = ort->dst.input;
2207 rt->dst.output = ort->dst.output;
2208 rt->rt6i_dst = ort->rt6i_dst;
2209 rt->dst.error = ort->dst.error;
2210 rt->rt6i_idev = ort->rt6i_idev;
2211 if (rt->rt6i_idev)
2212 in6_dev_hold(rt->rt6i_idev);
2213 rt->dst.lastuse = jiffies;
2214 rt->rt6i_gateway = ort->rt6i_gateway;
2215 rt->rt6i_flags = ort->rt6i_flags;
2216 rt6_set_from(rt, ort);
2217 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2218#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2219 rt->rt6i_src = ort->rt6i_src;
1da177e4 2220#endif
83a09abd
MKL		 2221 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2222 rt->rt6i_table = ort->rt6i_table;
61adedf3 2223 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2224}
2225
70ceb4f5 2226#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2227static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2228 const struct in6_addr *prefix, int prefixlen,
2229 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2230{
2231 struct fib6_node *fn;
2232 struct rt6_info *rt = NULL;
c71099ac
TG		 2233 struct fib6_table *table;
2234
efa2cea0 2235 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2236 if (!table)
c71099ac 2237 return NULL;
70ceb4f5 2238
5744dd9b 2239 read_lock_bh(&table->tb6_lock);
67ba4152 2240 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2241 if (!fn)
2242 goto out;
2243
d8d1f30b 2244 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2245 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2246 continue;
2247 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2248 continue;
2249 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2250 continue;
d8d1f30b 2251 dst_hold(&rt->dst);
70ceb4f5
YH		 2252 break;
2253 }
2254out:
5744dd9b 2255 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2256 return rt;
2257}
2258
efa2cea0 2259static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2260 const struct in6_addr *prefix, int prefixlen,
2261 const struct in6_addr *gwaddr, int ifindex,
95c96174 2262 unsigned int pref)
70ceb4f5 2263{
86872cb5
TG		 2264 struct fib6_config cfg = {
2265 .fc_table = RT6_TABLE_INFO,
238fc7ea 2266 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2267 .fc_ifindex = ifindex,
2268 .fc_dst_len = prefixlen,
2269 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2270 RTF_UP | RTF_PREF(pref),
15e47304 2271 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2272 .fc_nlinfo.nlh = NULL,
2273 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2274 };
2275
4e3fd7a0
AD		 2276 cfg.fc_dst = *prefix;
2277 cfg.fc_gateway = *gwaddr;
70ceb4f5 2278
e317da96
YH		 2279 /* We should treat it as a default route if prefix length is 0. */
2280 if (!prefixlen)
86872cb5 2281 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2282
86872cb5 2283 ip6_route_add(&cfg);
70ceb4f5 2284
efa2cea0 2285 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2286}
2287#endif
2288
b71d1d42 2289struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2290{
1da177e4 2291 struct rt6_info *rt;
c71099ac 2292 struct fib6_table *table;
1da177e4 2293
c346dca1 2294 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2295 if (!table)
c71099ac 2296 return NULL;
1da177e4 2297
5744dd9b 2298 read_lock_bh(&table->tb6_lock);
67ba4152 2299 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2300 if (dev == rt->dst.dev &&
045927ff 2301 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2302 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2303 break;
2304 }
2305 if (rt)
d8d1f30b 2306 dst_hold(&rt->dst);
5744dd9b 2307 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2308 return rt;
2309}
2310
b71d1d42 2311struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2312 struct net_device *dev,
2313 unsigned int pref)
1da177e4 2314{
86872cb5
TG		 2315 struct fib6_config cfg = {
2316 .fc_table = RT6_TABLE_DFLT,
238fc7ea 2317 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2318 .fc_ifindex = dev->ifindex,
2319 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2320 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2321 .fc_nlinfo.portid = 0,
5578689a 2322 .fc_nlinfo.nlh = NULL,
c346dca1 2323 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2324 };
1da177e4 2325
4e3fd7a0 2326 cfg.fc_gateway = *gwaddr;
1da177e4 2327
86872cb5 2328 ip6_route_add(&cfg);
1da177e4 2329
1da177e4
LT		 2330 return rt6_get_dflt_router(gwaddr, dev);
2331}
2332
7b4da532 2333void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2334{
2335 struct rt6_info *rt;
c71099ac
TG		 2336 struct fib6_table *table;
2337
2338 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2339 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2340 if (!table)
c71099ac 2341 return;
1da177e4
LT		 2342
2343restart:
c71099ac 2344 read_lock_bh(&table->tb6_lock);
d8d1f30b 2345 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2346 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2347 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2348 dst_hold(&rt->dst);
c71099ac 2349 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2350 ip6_del_rt(rt);
1da177e4
LT		 2351 goto restart;
2352 }
2353 }
c71099ac 2354 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2355}
2356
5578689a
DL		 2357static void rtmsg_to_fib6_config(struct net *net,
2358 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2359 struct fib6_config *cfg)
2360{
2361 memset(cfg, 0, sizeof(*cfg));
2362
2363 cfg->fc_table = RT6_TABLE_MAIN;
2364 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2365 cfg->fc_metric = rtmsg->rtmsg_metric;
2366 cfg->fc_expires = rtmsg->rtmsg_info;
2367 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2368 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2369 cfg->fc_flags = rtmsg->rtmsg_flags;
2370
5578689a 2371 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2372
4e3fd7a0
AD		 2373 cfg->fc_dst = rtmsg->rtmsg_dst;
2374 cfg->fc_src = rtmsg->rtmsg_src;
2375 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2376}
2377
5578689a 2378int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2379{
86872cb5 2380 struct fib6_config cfg;
1da177e4
LT		 2381 struct in6_rtmsg rtmsg;
2382 int err;
2383
67ba4152 2384 switch (cmd) {
1da177e4
LT		 2385 case SIOCADDRT: /* Add a route */
2386 case SIOCDELRT: /* Delete a route */
af31f412 2387 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2388 return -EPERM;
2389 err = copy_from_user(&rtmsg, arg,
2390 sizeof(struct in6_rtmsg));
2391 if (err)
2392 return -EFAULT;
86872cb5 2393
5578689a 2394 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2395
1da177e4
LT		 2396 rtnl_lock();
2397 switch (cmd) {
2398 case SIOCADDRT:
86872cb5 2399 err = ip6_route_add(&cfg);
1da177e4
LT		 2400 break;
2401 case SIOCDELRT:
86872cb5 2402 err = ip6_route_del(&cfg);
1da177e4
LT		 2403 break;
2404 default:
2405 err = -EINVAL;
2406 }
2407 rtnl_unlock();
2408
2409 return err;
3ff50b79 2410 }
1da177e4
LT		 2411
2412 return -EINVAL;
2413}
2414
2415/*
2416 * Drop the packet on the floor
2417 */
2418
d5fdd6ba 2419static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2420{
612f09e8 2421 int type;
adf30907 2422 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2423 switch (ipstats_mib_noroutes) {
2424 case IPSTATS_MIB_INNOROUTES:
0660e03f 2425 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2426 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2427 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2428 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2429 break;
2430 }
2431 /* FALLTHROUGH */
2432 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2433 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2434 ipstats_mib_noroutes);
612f09e8
YH		 2435 break;
2436 }
3ffe533c 2437 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2438 kfree_skb(skb);
2439 return 0;
2440}
2441
9ce8ade0
TG		 2442static int ip6_pkt_discard(struct sk_buff *skb)
2443{
612f09e8 2444 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2445}
2446
aad88724 2447static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
1da177e4 2448{
adf30907 2449 skb->dev = skb_dst(skb)->dev;
612f09e8 2450 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2451}
2452
9ce8ade0
TG		 2453static int ip6_pkt_prohibit(struct sk_buff *skb)
2454{
612f09e8 2455 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2456}
2457
aad88724 2458static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
9ce8ade0 2459{
adf30907 2460 skb->dev = skb_dst(skb)->dev;
612f09e8 2461 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2462}
2463
1da177e4
LT		 2464/*
2465 * Allocate a dst for local (unicast / anycast) address.
2466 */
2467
2468struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2469 const struct in6_addr *addr,
8f031519 2470 bool anycast)
1da177e4 2471{
c346dca1 2472 struct net *net = dev_net(idev->dev);
a3300ef4 2473 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2474 DST_NOCOUNT);
a3300ef4 2475 if (!rt)
1da177e4
LT		 2476 return ERR_PTR(-ENOMEM);
2477
1da177e4
LT		 2478 in6_dev_hold(idev);
2479
11d53b49 2480 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2481 rt->dst.input = ip6_input;
2482 rt->dst.output = ip6_output;
1da177e4 2483 rt->rt6i_idev = idev;
1da177e4
LT		 2484
2485 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2486 if (anycast)
2487 rt->rt6i_flags |= RTF_ANYCAST;
2488 else
1da177e4 2489 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2490
550bab42 2491 rt->rt6i_gateway = *addr;
4e3fd7a0 2492 rt->rt6i_dst.addr = *addr;
1da177e4 2493 rt->rt6i_dst.plen = 128;
5578689a 2494 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
1da177e4 2495
d8d1f30b 2496 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2497
2498 return rt;
2499}
2500
c3968a85
DW		 2501int ip6_route_get_saddr(struct net *net,
2502 struct rt6_info *rt,
b71d1d42 2503 const struct in6_addr *daddr,
c3968a85
DW		 2504 unsigned int prefs,
2505 struct in6_addr *saddr)
2506{
e16e888b
MS		 2507 struct inet6_dev *idev =
2508 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2509 int err = 0;
e16e888b 2510 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2511 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2512 else
2513 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2514 daddr, prefs, saddr);
2515 return err;
2516}
2517
2518/* remove deleted ip from prefsrc entries */
2519struct arg_dev_net_ip {
2520 struct net_device *dev;
2521 struct net *net;
2522 struct in6_addr *addr;
2523};
2524
2525static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2526{
2527 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2528 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2529 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2530
d1918542 2531 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2532 rt != net->ipv6.ip6_null_entry &&
2533 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2534 /* remove prefsrc entry */
2535 rt->rt6i_prefsrc.plen = 0;
2536 }
2537 return 0;
2538}
2539
2540void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2541{
2542 struct net *net = dev_net(ifp->idev->dev);
2543 struct arg_dev_net_ip adni = {
2544 .dev = ifp->idev->dev,
2545 .net = net,
2546 .addr = &ifp->addr,
2547 };
0c3584d5 2548 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2549}
2550
be7a010d
DJ		 2551#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2552#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2553
2554/* Remove routers and update dst entries when gateway turn into host. */
2555static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2556{
2557 struct in6_addr *gateway = (struct in6_addr *)arg;
2558
2559 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2560 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2561 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2562 return -1;
2563 }
2564 return 0;
2565}
2566
2567void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2568{
2569 fib6_clean_all(net, fib6_clean_tohost, gateway);
2570}
2571
8ed67789
DL		 2572struct arg_dev_net {
2573 struct net_device *dev;
2574 struct net *net;
2575};
2576
1da177e4
LT		 2577static int fib6_ifdown(struct rt6_info *rt, void *arg)
2578{
bc3ef660 2579 const struct arg_dev_net *adn = arg;
2580 const struct net_device *dev = adn->dev;
8ed67789 2581
d1918542 2582 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2583 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2584 return -1;
c159d30c 2585
1da177e4
LT		 2586 return 0;
2587}
2588
f3db4851 2589void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2590{
8ed67789
DL		 2591 struct arg_dev_net adn = {
2592 .dev = dev,
2593 .net = net,
2594 };
2595
0c3584d5 2596 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2597 icmp6_clean_all(fib6_ifdown, &adn);
8d0b94af 2598 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2599}
2600
95c96174 2601struct rt6_mtu_change_arg {
1da177e4 2602 struct net_device *dev;
95c96174 2603 unsigned int mtu;
1da177e4
LT		 2604};
2605
2606static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2607{
2608 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2609 struct inet6_dev *idev;
2610
2611 /* In IPv6 pmtu discovery is not optional,
2612 so that RTAX_MTU lock cannot disable it.
2613 We still use this lock to block changes
2614 caused by addrconf/ndisc.
2615 */
2616
2617 idev = __in6_dev_get(arg->dev);
38308473 2618 if (!idev)
1da177e4
LT		 2619 return 0;
2620
2621 /* For administrative MTU increase, there is no way to discover
2622 IPv6 PMTU increase, so PMTU increase should be updated here.
2623 Since RFC 1981 doesn't include administrative MTU increase
2624 update PMTU increase is a MUST. (i.e. jumbo frame)
2625 */
2626 /*
2627 If new MTU is less than route PMTU, this new MTU will be the
2628 lowest MTU in the path, update the route PMTU to reflect PMTU
2629 decreases; if new MTU is greater than route PMTU, and the
2630 old MTU is the lowest MTU in the path, update the route PMTU
2631 to reflect the increase. In this case if the other nodes' MTU
2632 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2633 PMTU discouvery.
2634 */
d1918542 2635 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2636 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2637 if (rt->rt6i_flags & RTF_CACHE) {
2638 /* For RTF_CACHE with rt6i_pmtu == 0
2639 * (i.e. a redirected route),
2640 * the metrics of its rt->dst.from has already
2641 * been updated.
2642 */
2643 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2644 rt->rt6i_pmtu = arg->mtu;
2645 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2646 (dst_mtu(&rt->dst) < arg->mtu &&
2647 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2648 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2649 }
566cfd8f 2650 }
1da177e4
LT		 2651 return 0;
2652}
2653
95c96174 2654void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2655{
c71099ac
TG		 2656 struct rt6_mtu_change_arg arg = {
2657 .dev = dev,
2658 .mtu = mtu,
2659 };
1da177e4 2660
0c3584d5 2661 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2662}
2663
ef7c79ed 2664static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2665 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2666 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2667 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2668 [RTA_PRIORITY] = { .type = NLA_U32 },
2669 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2670 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2671 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2672 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2673 [RTA_ENCAP] = { .type = NLA_NESTED },
86872cb5
TG		 2674};
2675
2676static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2677 struct fib6_config *cfg)
1da177e4 2678{
86872cb5
TG		 2679 struct rtmsg *rtm;
2680 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2681 unsigned int pref;
86872cb5 2682 int err;
1da177e4 2683
86872cb5
TG		 2684 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2685 if (err < 0)
2686 goto errout;
1da177e4 2687
86872cb5
TG		 2688 err = -EINVAL;
2689 rtm = nlmsg_data(nlh);
2690 memset(cfg, 0, sizeof(*cfg));
2691
2692 cfg->fc_table = rtm->rtm_table;
2693 cfg->fc_dst_len = rtm->rtm_dst_len;
2694 cfg->fc_src_len = rtm->rtm_src_len;
2695 cfg->fc_flags = RTF_UP;
2696 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2697 cfg->fc_type = rtm->rtm_type;
86872cb5 2698
ef2c7d7b
ND		 2699 if (rtm->rtm_type == RTN_UNREACHABLE ||
2700 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2701 rtm->rtm_type == RTN_PROHIBIT ||
2702 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2703 cfg->fc_flags |= RTF_REJECT;
2704
ab79ad14
MŻ		 2705 if (rtm->rtm_type == RTN_LOCAL)
2706 cfg->fc_flags |= RTF_LOCAL;
2707
1f56a01f
MKL		 2708 if (rtm->rtm_flags & RTM_F_CLONED)
2709 cfg->fc_flags |= RTF_CACHE;
2710
15e47304 2711 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2712 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2713 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2714
2715 if (tb[RTA_GATEWAY]) {
67b61f6c 2716 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2717 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2718 }
86872cb5
TG		 2719
2720 if (tb[RTA_DST]) {
2721 int plen = (rtm->rtm_dst_len + 7) >> 3;
2722
2723 if (nla_len(tb[RTA_DST]) < plen)
2724 goto errout;
2725
2726 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2727 }
86872cb5
TG		 2728
2729 if (tb[RTA_SRC]) {
2730 int plen = (rtm->rtm_src_len + 7) >> 3;
2731
2732 if (nla_len(tb[RTA_SRC]) < plen)
2733 goto errout;
2734
2735 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2736 }
86872cb5 2737
c3968a85 2738 if (tb[RTA_PREFSRC])
67b61f6c 2739 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2740
86872cb5
TG		 2741 if (tb[RTA_OIF])
2742 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2743
2744 if (tb[RTA_PRIORITY])
2745 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2746
2747 if (tb[RTA_METRICS]) {
2748 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2749 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2750 }
86872cb5
TG		 2751
2752 if (tb[RTA_TABLE])
2753 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2754
51ebd318
ND		 2755 if (tb[RTA_MULTIPATH]) {
2756 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2757 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2758 }
2759
c78ba6d6
LR		 2760 if (tb[RTA_PREF]) {
2761 pref = nla_get_u8(tb[RTA_PREF]);
2762 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2763 pref != ICMPV6_ROUTER_PREF_HIGH)
2764 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2765 cfg->fc_flags |= RTF_PREF(pref);
2766 }
2767
19e42e45
RP		 2768 if (tb[RTA_ENCAP])
2769 cfg->fc_encap = tb[RTA_ENCAP];
2770
2771 if (tb[RTA_ENCAP_TYPE])
2772 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2773
86872cb5
TG		 2774 err = 0;
2775errout:
2776 return err;
1da177e4
LT		 2777}
2778
51ebd318
ND		 2779static int ip6_route_multipath(struct fib6_config *cfg, int add)
2780{
2781 struct fib6_config r_cfg;
2782 struct rtnexthop *rtnh;
2783 int remaining;
2784 int attrlen;
2785 int err = 0, last_err = 0;
2786
35f1b4e9 2787 remaining = cfg->fc_mp_len;
51ebd318
ND		 2788beginning:
2789 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318
ND		 2790
2791 /* Parse a Multipath Entry */
2792 while (rtnh_ok(rtnh, remaining)) {
2793 memcpy(&r_cfg, cfg, sizeof(*cfg));
2794 if (rtnh->rtnh_ifindex)
2795 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2796
2797 attrlen = rtnh_attrlen(rtnh);
2798 if (attrlen > 0) {
2799 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2800
2801 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2802 if (nla) {
67b61f6c 2803 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2804 r_cfg.fc_flags |= RTF_GATEWAY;
2805 }
19e42e45
RP		 2806 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2807 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2808 if (nla)
2809 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318
ND		 2810 }
2811 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2812 if (err) {
2813 last_err = err;
2814 /* If we are trying to remove a route, do not stop the
2815 * loop when ip6_route_del() fails (because next hop is
2816 * already gone), we should try to remove all next hops.
2817 */
2818 if (add) {
2819 /* If add fails, we should try to delete all
2820 * next hops that have been already added.
2821 */
2822 add = 0;
35f1b4e9 2823 remaining = cfg->fc_mp_len - remaining;
51ebd318
ND		 2824 goto beginning;
2825 }
2826 }
1a72418b 2827 /* Because each route is added like a single route we remove
27596472
MK		 2828 * these flags after the first nexthop: if there is a collision,
2829 * we have already failed to add the first nexthop:
2830 * fib6_add_rt2node() has rejected it; when replacing, old
2831 * nexthops have been replaced by first new, the rest should
2832 * be added to it.
1a72418b 2833 */
27596472
MK		 2834 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2835 NLM_F_REPLACE);
51ebd318
ND		 2836 rtnh = rtnh_next(rtnh, &remaining);
2837 }
2838
2839 return last_err;
2840}
2841
67ba4152 2842static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2843{
86872cb5
TG		 2844 struct fib6_config cfg;
2845 int err;
1da177e4 2846
86872cb5
TG		 2847 err = rtm_to_fib6_config(skb, nlh, &cfg);
2848 if (err < 0)
2849 return err;
2850
51ebd318
ND		 2851 if (cfg.fc_mp)
2852 return ip6_route_multipath(&cfg, 0);
2853 else
2854 return ip6_route_del(&cfg);
1da177e4
LT		 2855}
2856
67ba4152 2857static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2858{
86872cb5
TG		 2859 struct fib6_config cfg;
2860 int err;
1da177e4 2861
86872cb5
TG		 2862 err = rtm_to_fib6_config(skb, nlh, &cfg);
2863 if (err < 0)
2864 return err;
2865
51ebd318
ND		 2866 if (cfg.fc_mp)
2867 return ip6_route_multipath(&cfg, 1);
2868 else
2869 return ip6_route_add(&cfg);
1da177e4
LT		 2870}
2871
19e42e45 2872static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 2873{
2874 return NLMSG_ALIGN(sizeof(struct rtmsg))
2875 + nla_total_size(16) /* RTA_SRC */
2876 + nla_total_size(16) /* RTA_DST */
2877 + nla_total_size(16) /* RTA_GATEWAY */
2878 + nla_total_size(16) /* RTA_PREFSRC */
2879 + nla_total_size(4) /* RTA_TABLE */
2880 + nla_total_size(4) /* RTA_IIF */
2881 + nla_total_size(4) /* RTA_OIF */
2882 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 2883 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 2884 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 2885 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 2886 + nla_total_size(1) /* RTA_PREF */
61adedf3 2887 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 2888}
2889
191cd582
BH		 2890static int rt6_fill_node(struct net *net,
2891 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 2892 struct in6_addr *dst, struct in6_addr *src,
15e47304 2893 int iif, int type, u32 portid, u32 seq,
7bc570c8 2894 int prefix, int nowait, unsigned int flags)
1da177e4 2895{
4b32b5ad 2896 u32 metrics[RTAX_MAX];
1da177e4 2897 struct rtmsg *rtm;
2d7202bf 2898 struct nlmsghdr *nlh;
e3703b3d 2899 long expires;
9e762a4a 2900 u32 table;
1da177e4
LT		 2901
2902 if (prefix) { /* user wants prefix routes only */
2903 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2904 /* success since this is not a prefix route */
2905 return 1;
2906 }
2907 }
2908
15e47304 2909 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 2910 if (!nlh)
26932566 2911 return -EMSGSIZE;
2d7202bf
TG		 2912
2913 rtm = nlmsg_data(nlh);
1da177e4
LT		 2914 rtm->rtm_family = AF_INET6;
2915 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2916 rtm->rtm_src_len = rt->rt6i_src.plen;
2917 rtm->rtm_tos = 0;
c71099ac 2918 if (rt->rt6i_table)
9e762a4a 2919 table = rt->rt6i_table->tb6_id;
c71099ac 2920 else
9e762a4a
PM		 2921 table = RT6_TABLE_UNSPEC;
2922 rtm->rtm_table = table;
c78679e8
DM		 2923 if (nla_put_u32(skb, RTA_TABLE, table))
2924 goto nla_put_failure;
ef2c7d7b
ND		 2925 if (rt->rt6i_flags & RTF_REJECT) {
2926 switch (rt->dst.error) {
2927 case -EINVAL:
2928 rtm->rtm_type = RTN_BLACKHOLE;
2929 break;
2930 case -EACCES:
2931 rtm->rtm_type = RTN_PROHIBIT;
2932 break;
b4949ab2
ND		 2933 case -EAGAIN:
2934 rtm->rtm_type = RTN_THROW;
2935 break;
ef2c7d7b
ND		 2936 default:
2937 rtm->rtm_type = RTN_UNREACHABLE;
2938 break;
2939 }
2940 }
38308473 2941 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 2942 rtm->rtm_type = RTN_LOCAL;
d1918542 2943 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2944 rtm->rtm_type = RTN_LOCAL;
2945 else
2946 rtm->rtm_type = RTN_UNICAST;
2947 rtm->rtm_flags = 0;
35103d11 2948 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 2949 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 2950 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
2951 rtm->rtm_flags |= RTNH_F_DEAD;
2952 }
1da177e4
LT		 2953 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2954 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 2955 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 2956 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 2957 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2958 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2959 rtm->rtm_protocol = RTPROT_RA;
2960 else
2961 rtm->rtm_protocol = RTPROT_KERNEL;
2962 }
1da177e4 2963
38308473 2964 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 2965 rtm->rtm_flags |= RTM_F_CLONED;
2966
2967 if (dst) {
930345ea 2968 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 2969 goto nla_put_failure;
1ab1457c 2970 rtm->rtm_dst_len = 128;
1da177e4 2971 } else if (rtm->rtm_dst_len)
930345ea 2972 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 2973 goto nla_put_failure;
1da177e4
LT		 2974#ifdef CONFIG_IPV6_SUBTREES
2975 if (src) {
930345ea 2976 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 2977 goto nla_put_failure;
1ab1457c 2978 rtm->rtm_src_len = 128;
c78679e8 2979 } else if (rtm->rtm_src_len &&
930345ea 2980 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 2981 goto nla_put_failure;
1da177e4 2982#endif
7bc570c8
YH		 2983 if (iif) {
2984#ifdef CONFIG_IPV6_MROUTE
2985 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 2986 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 2987 if (err <= 0) {
2988 if (!nowait) {
2989 if (err == 0)
2990 return 0;
2991 goto nla_put_failure;
2992 } else {
2993 if (err == -EMSGSIZE)
2994 goto nla_put_failure;
2995 }
2996 }
2997 } else
2998#endif
c78679e8
DM		 2999 if (nla_put_u32(skb, RTA_IIF, iif))
3000 goto nla_put_failure;
7bc570c8 3001 } else if (dst) {
1da177e4 3002 struct in6_addr saddr_buf;
c78679e8 3003 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3004 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3005 goto nla_put_failure;
1da177e4 3006 }
2d7202bf 3007
c3968a85
DW		 3008 if (rt->rt6i_prefsrc.plen) {
3009 struct in6_addr saddr_buf;
4e3fd7a0 3010 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3011 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3012 goto nla_put_failure;
c3968a85
DW		 3013 }
3014
4b32b5ad
MKL		 3015 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3016 if (rt->rt6i_pmtu)
3017 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3018 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3019 goto nla_put_failure;
3020
dd0cbf29 3021 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3022 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3023 goto nla_put_failure;
94f826b8 3024 }
2d7202bf 3025
c78679e8
DM		 3026 if (rt->dst.dev &&
3027 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3028 goto nla_put_failure;
3029 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3030 goto nla_put_failure;
8253947e
LW		 3031
3032 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3033
87a50699 3034 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3035 goto nla_put_failure;
2d7202bf 3036
c78ba6d6
LR		 3037 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3038 goto nla_put_failure;
3039
61adedf3 3040 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3041
053c095a
JB		 3042 nlmsg_end(skb, nlh);
3043 return 0;
2d7202bf
TG		 3044
3045nla_put_failure:
26932566
PM		 3046 nlmsg_cancel(skb, nlh);
3047 return -EMSGSIZE;
1da177e4
LT		 3048}
3049
1b43af54 3050int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3051{
3052 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3053 int prefix;
3054
2d7202bf
TG		 3055 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3056 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3057 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3058 } else
3059 prefix = 0;
3060
191cd582
BH		 3061 return rt6_fill_node(arg->net,
3062 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3063 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3064 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3065}
3066
67ba4152 3067static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3068{
3b1e0a65 3069 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3070 struct nlattr *tb[RTA_MAX+1];
3071 struct rt6_info *rt;
1da177e4 3072 struct sk_buff *skb;
ab364a6f 3073 struct rtmsg *rtm;
4c9483b2 3074 struct flowi6 fl6;
72331bc0 3075 int err, iif = 0, oif = 0;
1da177e4 3076
ab364a6f
TG		 3077 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3078 if (err < 0)
3079 goto errout;
1da177e4 3080
ab364a6f 3081 err = -EINVAL;
4c9483b2 3082 memset(&fl6, 0, sizeof(fl6));
1da177e4 3083
ab364a6f
TG		 3084 if (tb[RTA_SRC]) {
3085 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3086 goto errout;
3087
4e3fd7a0 3088 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3089 }
3090
3091 if (tb[RTA_DST]) {
3092 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3093 goto errout;
3094
4e3fd7a0 3095 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3096 }
3097
3098 if (tb[RTA_IIF])
3099 iif = nla_get_u32(tb[RTA_IIF]);
3100
3101 if (tb[RTA_OIF])
72331bc0 3102 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3103
2e47b291
LC		 3104 if (tb[RTA_MARK])
3105 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3106
1da177e4
LT		 3107 if (iif) {
3108 struct net_device *dev;
72331bc0
SL		 3109 int flags = 0;
3110
5578689a 3111 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3112 if (!dev) {
3113 err = -ENODEV;
ab364a6f 3114 goto errout;
1da177e4 3115 }
72331bc0
SL		 3116
3117 fl6.flowi6_iif = iif;
3118
3119 if (!ipv6_addr_any(&fl6.saddr))
3120 flags |= RT6_LOOKUP_F_HAS_SADDR;
3121
3122 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3123 flags);
3124 } else {
3125 fl6.flowi6_oif = oif;
3126
3127 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3128 }
3129
ab364a6f 3130 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3131 if (!skb) {
94e187c0 3132 ip6_rt_put(rt);
ab364a6f
TG		 3133 err = -ENOBUFS;
3134 goto errout;
3135 }
1da177e4 3136
ab364a6f
TG		 3137 /* Reserve room for dummy headers, this skb can pass
3138 through good chunk of routing engine.
3139 */
459a98ed 3140 skb_reset_mac_header(skb);
ab364a6f 3141 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3142
d8d1f30b 3143 skb_dst_set(skb, &rt->dst);
1da177e4 3144
4c9483b2 3145 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3146 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3147 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3148 if (err < 0) {
ab364a6f
TG		 3149 kfree_skb(skb);
3150 goto errout;
1da177e4
LT		 3151 }
3152
15e47304 3153 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3154errout:
1da177e4 3155 return err;
1da177e4
LT		 3156}
3157
86872cb5 3158void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 3159{
3160 struct sk_buff *skb;
5578689a 3161 struct net *net = info->nl_net;
528c4ceb
DL		 3162 u32 seq;
3163 int err;
3164
3165 err = -ENOBUFS;
38308473 3166 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3167
19e42e45 3168 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3169 if (!skb)
21713ebc
TG		 3170 goto errout;
3171
191cd582 3172 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
15e47304 3173 event, info->portid, seq, 0, 0, 0);
26932566
PM		 3174 if (err < 0) {
3175 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3176 WARN_ON(err == -EMSGSIZE);
3177 kfree_skb(skb);
3178 goto errout;
3179 }
15e47304 3180 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3181 info->nlh, gfp_any());
3182 return;
21713ebc
TG		 3183errout:
3184 if (err < 0)
5578689a 3185 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3186}
3187
8ed67789 3188static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3189 unsigned long event, void *ptr)
8ed67789 3190{
351638e7 3191 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3192 struct net *net = dev_net(dev);
8ed67789
DL		 3193
3194 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3195 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3196 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3197#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3198 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3199 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3200 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3201 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3202#endif
3203 }
3204
3205 return NOTIFY_OK;
3206}
3207
1da177e4
LT		 3208/*
3209 * /proc
3210 */
3211
3212#ifdef CONFIG_PROC_FS
3213
33120b30
AD		 3214static const struct file_operations ipv6_route_proc_fops = {
3215 .owner = THIS_MODULE,
3216 .open = ipv6_route_open,
3217 .read = seq_read,
3218 .llseek = seq_lseek,
8d2ca1d7 3219 .release = seq_release_net,
33120b30
AD		 3220};
3221
1da177e4
LT		 3222static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3223{
69ddb805 3224 struct net *net = (struct net *)seq->private;
1da177e4 3225 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3226 net->ipv6.rt6_stats->fib_nodes,
3227 net->ipv6.rt6_stats->fib_route_nodes,
3228 net->ipv6.rt6_stats->fib_rt_alloc,
3229 net->ipv6.rt6_stats->fib_rt_entries,
3230 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3231 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3232 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3233
3234 return 0;
3235}
3236
3237static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3238{
de05c557 3239 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3240}
3241
9a32144e 3242static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3243 .owner = THIS_MODULE,
3244 .open = rt6_stats_seq_open,
3245 .read = seq_read,
3246 .llseek = seq_lseek,
b6fcbdb4 3247 .release = single_release_net,
1da177e4
LT		 3248};
3249#endif /* CONFIG_PROC_FS */
3250
3251#ifdef CONFIG_SYSCTL
3252
1da177e4 3253static
fe2c6338 3254int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3255 void __user *buffer, size_t *lenp, loff_t *ppos)
3256{
c486da34
LAG		 3257 struct net *net;
3258 int delay;
3259 if (!write)
1da177e4 3260 return -EINVAL;
c486da34
LAG		 3261
3262 net = (struct net *)ctl->extra1;
3263 delay = net->ipv6.sysctl.flush_delay;
3264 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3265 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3266 return 0;
1da177e4
LT		 3267}
3268
fe2c6338 3269struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3270 {
1da177e4 3271 .procname = "flush",
4990509f 3272 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3273 .maxlen = sizeof(int),
89c8b3a1 3274 .mode = 0200,
6d9f239a 3275 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3276 },
3277 {
1da177e4 3278 .procname = "gc_thresh",
9a7ec3a9 3279 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3280 .maxlen = sizeof(int),
3281 .mode = 0644,
6d9f239a 3282 .proc_handler = proc_dointvec,
1da177e4
LT		 3283 },
3284 {
1da177e4 3285 .procname = "max_size",
4990509f 3286 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3287 .maxlen = sizeof(int),
3288 .mode = 0644,
6d9f239a 3289 .proc_handler = proc_dointvec,
1da177e4
LT		 3290 },
3291 {
1da177e4 3292 .procname = "gc_min_interval",
4990509f 3293 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3294 .maxlen = sizeof(int),
3295 .mode = 0644,
6d9f239a 3296 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3297 },
3298 {
1da177e4 3299 .procname = "gc_timeout",
4990509f 3300 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3301 .maxlen = sizeof(int),
3302 .mode = 0644,
6d9f239a 3303 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3304 },
3305 {
1da177e4 3306 .procname = "gc_interval",
4990509f 3307 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3308 .maxlen = sizeof(int),
3309 .mode = 0644,
6d9f239a 3310 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3311 },
3312 {
1da177e4 3313 .procname = "gc_elasticity",
4990509f 3314 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3315 .maxlen = sizeof(int),
3316 .mode = 0644,
f3d3f616 3317 .proc_handler = proc_dointvec,
1da177e4
LT		 3318 },
3319 {
1da177e4 3320 .procname = "mtu_expires",
4990509f 3321 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3322 .maxlen = sizeof(int),
3323 .mode = 0644,
6d9f239a 3324 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3325 },
3326 {
1da177e4 3327 .procname = "min_adv_mss",
4990509f 3328 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3329 .maxlen = sizeof(int),
3330 .mode = 0644,
f3d3f616 3331 .proc_handler = proc_dointvec,
1da177e4
LT		 3332 },
3333 {
1da177e4 3334 .procname = "gc_min_interval_ms",
4990509f 3335 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3336 .maxlen = sizeof(int),
3337 .mode = 0644,
6d9f239a 3338 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3339 },
f8572d8f 3340 { }
1da177e4
LT		 3341};
3342
2c8c1e72 3343struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3344{
3345 struct ctl_table *table;
3346
3347 table = kmemdup(ipv6_route_table_template,
3348 sizeof(ipv6_route_table_template),
3349 GFP_KERNEL);
5ee09105
YH		 3350
3351 if (table) {
3352 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3353 table[0].extra1 = net;
86393e52 3354 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3355 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3356 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3357 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3358 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3359 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3360 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3361 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3362 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3363
3364 /* Don't export sysctls to unprivileged users */
3365 if (net->user_ns != &init_user_ns)
3366 table[0].procname = NULL;
5ee09105
YH		 3367 }
3368
760f2d01
DL		 3369 return table;
3370}
1da177e4
LT		 3371#endif
3372
2c8c1e72 3373static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3374{
633d424b 3375 int ret = -ENOMEM;
8ed67789 3376
86393e52
AD		 3377 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3378 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3379
fc66f95c
ED		 3380 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3381 goto out_ip6_dst_ops;
3382
8ed67789
DL		 3383 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3384 sizeof(*net->ipv6.ip6_null_entry),
3385 GFP_KERNEL);
3386 if (!net->ipv6.ip6_null_entry)
fc66f95c 3387 goto out_ip6_dst_entries;
d8d1f30b 3388 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3389 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3390 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3391 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3392 ip6_template_metrics, true);
8ed67789
DL		 3393
3394#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3395 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3396 sizeof(*net->ipv6.ip6_prohibit_entry),
3397 GFP_KERNEL);
68fffc67
PZ		 3398 if (!net->ipv6.ip6_prohibit_entry)
3399 goto out_ip6_null_entry;
d8d1f30b 3400 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3401 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3402 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3403 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3404 ip6_template_metrics, true);
8ed67789
DL		 3405
3406 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3407 sizeof(*net->ipv6.ip6_blk_hole_entry),
3408 GFP_KERNEL);
68fffc67
PZ		 3409 if (!net->ipv6.ip6_blk_hole_entry)
3410 goto out_ip6_prohibit_entry;
d8d1f30b 3411 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3412 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3413 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3414 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3415 ip6_template_metrics, true);
8ed67789
DL		 3416#endif
3417
b339a47c
PZ		 3418 net->ipv6.sysctl.flush_delay = 0;
3419 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3420 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3421 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3422 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3423 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3424 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3425 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3426
6891a346
BT		 3427 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3428
8ed67789
DL		 3429 ret = 0;
3430out:
3431 return ret;
f2fc6a54 3432
68fffc67
PZ		 3433#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3434out_ip6_prohibit_entry:
3435 kfree(net->ipv6.ip6_prohibit_entry);
3436out_ip6_null_entry:
3437 kfree(net->ipv6.ip6_null_entry);
3438#endif
fc66f95c
ED		 3439out_ip6_dst_entries:
3440 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3441out_ip6_dst_ops:
f2fc6a54 3442 goto out;
cdb18761
DL		 3443}
3444
2c8c1e72 3445static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3446{
8ed67789
DL		 3447 kfree(net->ipv6.ip6_null_entry);
3448#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3449 kfree(net->ipv6.ip6_prohibit_entry);
3450 kfree(net->ipv6.ip6_blk_hole_entry);
3451#endif
41bb78b4 3452 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3453}
3454
d189634e
TG		 3455static int __net_init ip6_route_net_init_late(struct net *net)
3456{
3457#ifdef CONFIG_PROC_FS
d4beaa66
G		 3458 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3459 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3460#endif
3461 return 0;
3462}
3463
3464static void __net_exit ip6_route_net_exit_late(struct net *net)
3465{
3466#ifdef CONFIG_PROC_FS
ece31ffd
G		 3467 remove_proc_entry("ipv6_route", net->proc_net);
3468 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3469#endif
3470}
3471
cdb18761
DL		 3472static struct pernet_operations ip6_route_net_ops = {
3473 .init = ip6_route_net_init,
3474 .exit = ip6_route_net_exit,
3475};
3476
c3426b47
DM		 3477static int __net_init ipv6_inetpeer_init(struct net *net)
3478{
3479 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3480
3481 if (!bp)
3482 return -ENOMEM;
3483 inet_peer_base_init(bp);
3484 net->ipv6.peers = bp;
3485 return 0;
3486}
3487
3488static void __net_exit ipv6_inetpeer_exit(struct net *net)
3489{
3490 struct inet_peer_base *bp = net->ipv6.peers;
3491
3492 net->ipv6.peers = NULL;
56a6b248 3493 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3494 kfree(bp);
3495}
3496
2b823f72 3497static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3498 .init = ipv6_inetpeer_init,
3499 .exit = ipv6_inetpeer_exit,
3500};
3501
d189634e
TG		 3502static struct pernet_operations ip6_route_net_late_ops = {
3503 .init = ip6_route_net_init_late,
3504 .exit = ip6_route_net_exit_late,
3505};
3506
8ed67789
DL		 3507static struct notifier_block ip6_route_dev_notifier = {
3508 .notifier_call = ip6_route_dev_notify,
3509 .priority = 0,
3510};
3511
433d49c3 3512int __init ip6_route_init(void)
1da177e4 3513{
433d49c3 3514 int ret;
8d0b94af 3515 int cpu;
433d49c3 3516
9a7ec3a9
DL		 3517 ret = -ENOMEM;
3518 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3519 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3520 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3521 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3522 goto out;
14e50e57 3523
fc66f95c 3524 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3525 if (ret)
bdb3289f 3526 goto out_kmem_cache;
bdb3289f 3527
c3426b47
DM		 3528 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3529 if (ret)
e8803b6c 3530 goto out_dst_entries;
2a0c451a 3531
7e52b33b
DM		 3532 ret = register_pernet_subsys(&ip6_route_net_ops);
3533 if (ret)
3534 goto out_register_inetpeer;
c3426b47 3535
5dc121e9
AE		 3536 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3537
8ed67789
DL		 3538 /* Registering of the loopback is done before this portion of code,
3539 * the loopback reference in rt6_info will not be taken, do it
3540 * manually for init_net */
d8d1f30b 3541 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3542 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3543 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3544 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3545 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3546 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3547 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3548 #endif
e8803b6c 3549 ret = fib6_init();
433d49c3 3550 if (ret)
8ed67789 3551 goto out_register_subsys;
433d49c3 3552
433d49c3
DL		 3553 ret = xfrm6_init();
3554 if (ret)
e8803b6c 3555 goto out_fib6_init;
c35b7e72 3556
433d49c3
DL		 3557 ret = fib6_rules_init();
3558 if (ret)
3559 goto xfrm6_init;
7e5449c2 3560
d189634e
TG		 3561 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3562 if (ret)
3563 goto fib6_rules_init;
3564
433d49c3 3565 ret = -ENOBUFS;
c7ac8679
GR		 3566 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3567 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3568 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3569 goto out_register_late_subsys;
c127ea2c 3570
8ed67789 3571 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3572 if (ret)
d189634e 3573 goto out_register_late_subsys;
8ed67789 3574
8d0b94af
MKL		 3575 for_each_possible_cpu(cpu) {
3576 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3577
3578 INIT_LIST_HEAD(&ul->head);
3579 spin_lock_init(&ul->lock);
3580 }
3581
433d49c3
DL		 3582out:
3583 return ret;
3584
d189634e
TG		 3585out_register_late_subsys:
3586 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3587fib6_rules_init:
433d49c3
DL		 3588 fib6_rules_cleanup();
3589xfrm6_init:
433d49c3 3590 xfrm6_fini();
2a0c451a
TG		 3591out_fib6_init:
3592 fib6_gc_cleanup();
8ed67789
DL		 3593out_register_subsys:
3594 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3595out_register_inetpeer:
3596 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3597out_dst_entries:
3598 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3599out_kmem_cache:
f2fc6a54 3600 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3601 goto out;
1da177e4
LT		 3602}
3603
3604void ip6_route_cleanup(void)
3605{
8ed67789 3606 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3607 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3608 fib6_rules_cleanup();
1da177e4 3609 xfrm6_fini();
1da177e4 3610 fib6_gc_cleanup();
c3426b47 3611 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3612 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3613 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3614 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3615}
Linux kernel - Deliverables
This page took 1.356837 seconds and 5 git commands to generate.