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Merge branch 'lantiq-GSWIP-fixes'
[linux-block.git] / net / ipv6 / route.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * Linux INET6 implementation
4 * FIB front-end.
5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 8 */
9
10/* Changes:
11 *
12 * YOSHIFUJI Hideaki @USAGI
13 * reworked default router selection.
14 * - respect outgoing interface
15 * - select from (probably) reachable routers (i.e.
16 * routers in REACHABLE, STALE, DELAY or PROBE states).
17 * - always select the same router if it is (probably)
18 * reachable. otherwise, round-robin the list.
c0bece9f
YH		 19 * Ville Nuorvala
20 * Fixed routing subtrees.
1da177e4
LT		 21 */
22
f3213831
JP		 23#define pr_fmt(fmt) "IPv6: " fmt
24
4fc268d2 25#include <linux/capability.h>
1da177e4 26#include <linux/errno.h>
bc3b2d7f 27#include <linux/export.h>
1da177e4
LT		 28#include <linux/types.h>
29#include <linux/times.h>
30#include <linux/socket.h>
31#include <linux/sockios.h>
32#include <linux/net.h>
33#include <linux/route.h>
34#include <linux/netdevice.h>
35#include <linux/in6.h>
7bc570c8 36#include <linux/mroute6.h>
1da177e4 37#include <linux/init.h>
1da177e4 38#include <linux/if_arp.h>
1da177e4
LT		 39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
5b7c931d 41#include <linux/nsproxy.h>
5a0e3ad6 42#include <linux/slab.h>
35732d01 43#include <linux/jhash.h>
457c4cbc 44#include <net/net_namespace.h>
1da177e4
LT		 45#include <net/snmp.h>
46#include <net/ipv6.h>
47#include <net/ip6_fib.h>
48#include <net/ip6_route.h>
49#include <net/ndisc.h>
50#include <net/addrconf.h>
51#include <net/tcp.h>
52#include <linux/rtnetlink.h>
53#include <net/dst.h>
904af04d 54#include <net/dst_metadata.h>
1da177e4 55#include <net/xfrm.h>
8d71740c 56#include <net/netevent.h>
21713ebc 57#include <net/netlink.h>
3c618c1d 58#include <net/rtnh.h>
19e42e45 59#include <net/lwtunnel.h>
904af04d 60#include <net/ip_tunnels.h>
ca254490 61#include <net/l3mdev.h>
eacb9384 62#include <net/ip.h>
7c0f6ba6 63#include <linux/uaccess.h>
951cf368 64#include <linux/btf_ids.h>
1da177e4
LT		 65
66#ifdef CONFIG_SYSCTL
67#include <linux/sysctl.h>
68#endif
69
30d444d3
DA		 70static int ip6_rt_type_to_error(u8 fib6_type);
71
72#define CREATE_TRACE_POINTS
73#include <trace/events/fib6.h>
74EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
75#undef CREATE_TRACE_POINTS
76
afc154e9 77enum rt6_nud_state {
7e980569
JB		 78 RT6_NUD_FAIL_HARD = -3,
79 RT6_NUD_FAIL_PROBE = -2,
80 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 81 RT6_NUD_SUCCEED = 1
82};
83
bbd807df
BV		 84INDIRECT_CALLABLE_SCOPE
85struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 86static unsigned int ip6_default_advmss(const struct dst_entry *dst);
f67fbeae
BV		 87INDIRECT_CALLABLE_SCOPE
88unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 89static struct dst_entry *ip6_negative_advice(struct dst_entry *);
90static void ip6_dst_destroy(struct dst_entry *);
91static void ip6_dst_ifdown(struct dst_entry *,
92 struct net_device *dev, int how);
569d3645 93static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 94
95static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 96static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 97static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 98static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 99static void ip6_link_failure(struct sk_buff *skb);
6700c270 100static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
bd085ef6
HL		 101 struct sk_buff *skb, u32 mtu,
102 bool confirm_neigh);
6700c270
DM		 103static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
104 struct sk_buff *skb);
702cea56
DA		 105static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
106 int strict);
a1b7a1f0 107static size_t rt6_nlmsg_size(struct fib6_info *f6i);
d4ead6b3 108static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 109 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 110 struct in6_addr *dest, struct in6_addr *src,
16a16cd3
DA		 111 int iif, int type, u32 portid, u32 seq,
112 unsigned int flags);
7e4b5128 113static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
510e2ced
WW		 114 const struct in6_addr *daddr,
115 const struct in6_addr *saddr);
1da177e4 116
70ceb4f5 117#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 118static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 119 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 120 const struct in6_addr *gwaddr,
121 struct net_device *dev,
95c96174 122 unsigned int pref);
8d1c802b 123static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 124 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 125 const struct in6_addr *gwaddr,
126 struct net_device *dev);
70ceb4f5
YH		 127#endif
128
8d0b94af
MKL		 129struct uncached_list {
130 spinlock_t lock;
131 struct list_head head;
132};
133
134static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
135
510c321b 136void rt6_uncached_list_add(struct rt6_info *rt)
8d0b94af
MKL		 137{
138 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
139
8d0b94af
MKL		 140 rt->rt6i_uncached_list = ul;
141
142 spin_lock_bh(&ul->lock);
143 list_add_tail(&rt->rt6i_uncached, &ul->head);
144 spin_unlock_bh(&ul->lock);
145}
146
510c321b 147void rt6_uncached_list_del(struct rt6_info *rt)
8d0b94af
MKL		 148{
149 if (!list_empty(&rt->rt6i_uncached)) {
150 struct uncached_list *ul = rt->rt6i_uncached_list;
81eb8447 151 struct net *net = dev_net(rt->dst.dev);
8d0b94af
MKL		 152
153 spin_lock_bh(&ul->lock);
154 list_del(&rt->rt6i_uncached);
81eb8447 155 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
8d0b94af
MKL		 156 spin_unlock_bh(&ul->lock);
157 }
158}
159
160static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
161{
162 struct net_device *loopback_dev = net->loopback_dev;
163 int cpu;
164
e332bc67
EB		 165 if (dev == loopback_dev)
166 return;
167
8d0b94af
MKL		 168 for_each_possible_cpu(cpu) {
169 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
170 struct rt6_info *rt;
171
172 spin_lock_bh(&ul->lock);
173 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
174 struct inet6_dev *rt_idev = rt->rt6i_idev;
175 struct net_device *rt_dev = rt->dst.dev;
176
e332bc67 177 if (rt_idev->dev == dev) {
8d0b94af
MKL		 178 rt->rt6i_idev = in6_dev_get(loopback_dev);
179 in6_dev_put(rt_idev);
180 }
181
e332bc67 182 if (rt_dev == dev) {
8d7017fd 183 rt->dst.dev = blackhole_netdev;
8d0b94af
MKL		 184 dev_hold(rt->dst.dev);
185 dev_put(rt_dev);
186 }
187 }
188 spin_unlock_bh(&ul->lock);
189 }
190}
191
f8a1b43b 192static inline const void *choose_neigh_daddr(const struct in6_addr *p,
f894cbf8
DM		 193 struct sk_buff *skb,
194 const void *daddr)
39232973 195{
a7563f34 196 if (!ipv6_addr_any(p))
39232973 197 return (const void *) p;
f894cbf8
DM		 198 else if (skb)
199 return &ipv6_hdr(skb)->daddr;
39232973
DM		 200 return daddr;
201}
202
f8a1b43b
DA		 203struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
204 struct net_device *dev,
205 struct sk_buff *skb,
206 const void *daddr)
d3aaeb38 207{
39232973
DM		 208 struct neighbour *n;
209
f8a1b43b
DA		 210 daddr = choose_neigh_daddr(gw, skb, daddr);
211 n = __ipv6_neigh_lookup(dev, daddr);
f83c7790
DM		 212 if (n)
213 return n;
7adf3246
SB		 214
215 n = neigh_create(&nd_tbl, daddr, dev);
216 return IS_ERR(n) ? NULL : n;
f8a1b43b
DA		 217}
218
219static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
220 struct sk_buff *skb,
221 const void *daddr)
222{
223 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
224
2c6b55f4
ND		 225 return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),
226 dst->dev, skb, daddr);
f83c7790
DM		 227}
228
63fca65d
JA		 229static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
230{
231 struct net_device *dev = dst->dev;
232 struct rt6_info *rt = (struct rt6_info *)dst;
233
cbfd6891 234 daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr);
63fca65d
JA		 235 if (!daddr)
236 return;
237 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
238 return;
239 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
240 return;
241 __ipv6_confirm_neigh(dev, daddr);
242}
243
9a7ec3a9 244static struct dst_ops ip6_dst_ops_template = {
1da177e4 245 .family = AF_INET6,
1da177e4
LT		 246 .gc = ip6_dst_gc,
247 .gc_thresh = 1024,
248 .check = ip6_dst_check,
0dbaee3b 249 .default_advmss = ip6_default_advmss,
ebb762f2 250 .mtu = ip6_mtu,
d4ead6b3 251 .cow_metrics = dst_cow_metrics_generic,
1da177e4
LT		 252 .destroy = ip6_dst_destroy,
253 .ifdown = ip6_dst_ifdown,
254 .negative_advice = ip6_negative_advice,
255 .link_failure = ip6_link_failure,
256 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 257 .redirect = rt6_do_redirect,
9f8955cc 258 .local_out = __ip6_local_out,
f8a1b43b 259 .neigh_lookup = ip6_dst_neigh_lookup,
63fca65d 260 .confirm_neigh = ip6_confirm_neigh,
1da177e4
LT		 261};
262
14e50e57 263static struct dst_ops ip6_dst_blackhole_ops = {
c4c877b2
DB		 264 .family = AF_INET6,
265 .default_advmss = ip6_default_advmss,
266 .neigh_lookup = ip6_dst_neigh_lookup,
267 .check = ip6_dst_check,
268 .destroy = ip6_dst_destroy,
269 .cow_metrics = dst_cow_metrics_generic,
270 .update_pmtu = dst_blackhole_update_pmtu,
271 .redirect = dst_blackhole_redirect,
272 .mtu = dst_blackhole_mtu,
14e50e57
DM		 273};
274
62fa8a84 275static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 276 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 277};
278
8d1c802b 279static const struct fib6_info fib6_null_entry_template = {
93c2fb25
DA		 280 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
281 .fib6_protocol = RTPROT_KERNEL,
282 .fib6_metric = ~(u32)0,
f05713e0 283 .fib6_ref = REFCOUNT_INIT(1),
421842ed
DA		 284 .fib6_type = RTN_UNREACHABLE,
285 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
286};
287
fb0af4c7 288static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 289 .dst = {
290 .__refcnt = ATOMIC_INIT(1),
291 .__use = 1,
2c20cbd7 292 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 293 .error = -ENETUNREACH,
d8d1f30b
CG		 294 .input = ip6_pkt_discard,
295 .output = ip6_pkt_discard_out,
1da177e4
LT		 296 },
297 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
1da177e4
LT		 298};
299
101367c2
TG		 300#ifdef CONFIG_IPV6_MULTIPLE_TABLES
301
fb0af4c7 302static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 303 .dst = {
304 .__refcnt = ATOMIC_INIT(1),
305 .__use = 1,
2c20cbd7 306 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 307 .error = -EACCES,
d8d1f30b
CG		 308 .input = ip6_pkt_prohibit,
309 .output = ip6_pkt_prohibit_out,
101367c2
TG		 310 },
311 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 312};
313
fb0af4c7 314static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 315 .dst = {
316 .__refcnt = ATOMIC_INIT(1),
317 .__use = 1,
2c20cbd7 318 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 319 .error = -EINVAL,
d8d1f30b 320 .input = dst_discard,
ede2059d 321 .output = dst_discard_out,
101367c2
TG		 322 },
323 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 324};
325
326#endif
327
ebfa45f0
MKL		 328static void rt6_info_init(struct rt6_info *rt)
329{
330 struct dst_entry *dst = &rt->dst;
331
332 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
ebfa45f0
MKL		 333 INIT_LIST_HEAD(&rt->rt6i_uncached);
334}
335
1da177e4 336/* allocate dst with ip6_dst_ops */
93531c67
DA		 337struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
338 int flags)
1da177e4 339{
97bab73f 340 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
b2a9c0ed 341 1, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 342
81eb8447 343 if (rt) {
ebfa45f0 344 rt6_info_init(rt);
81eb8447
WW		 345 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
346 }
8104891b 347
cf911662 348 return rt;
1da177e4 349}
9ab179d8 350EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 351
1da177e4
LT		 352static void ip6_dst_destroy(struct dst_entry *dst)
353{
354 struct rt6_info *rt = (struct rt6_info *)dst;
a68886a6 355 struct fib6_info *from;
8d0b94af 356 struct inet6_dev *idev;
1da177e4 357
1620a336 358 ip_dst_metrics_put(dst);
8d0b94af
MKL		 359 rt6_uncached_list_del(rt);
360
361 idev = rt->rt6i_idev;
38308473 362 if (idev) {
1da177e4
LT		 363 rt->rt6i_idev = NULL;
364 in6_dev_put(idev);
1ab1457c 365 }
1716a961 366
0e233874 367 from = xchg((__force struct fib6_info **)&rt->from, NULL);
93531c67 368 fib6_info_release(from);
b3419363
DM		 369}
370
1da177e4
LT		 371static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
372 int how)
373{
374 struct rt6_info *rt = (struct rt6_info *)dst;
375 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 376 struct net_device *loopback_dev =
c346dca1 377 dev_net(dev)->loopback_dev;
1da177e4 378
e5645f51
WW		 379 if (idev && idev->dev != loopback_dev) {
380 struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
381 if (loopback_idev) {
382 rt->rt6i_idev = loopback_idev;
383 in6_dev_put(idev);
97cac082 384 }
1da177e4
LT		 385 }
386}
387
5973fb1e
MKL		 388static bool __rt6_check_expired(const struct rt6_info *rt)
389{
390 if (rt->rt6i_flags & RTF_EXPIRES)
391 return time_after(jiffies, rt->dst.expires);
392 else
393 return false;
394}
395
a50feda5 396static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 397{
a68886a6
DA		 398 struct fib6_info *from;
399
400 from = rcu_dereference(rt->from);
401
1716a961
G		 402 if (rt->rt6i_flags & RTF_EXPIRES) {
403 if (time_after(jiffies, rt->dst.expires))
a50feda5 404 return true;
a68886a6 405 } else if (from) {
1e2ea8ad 406 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
a68886a6 407 fib6_check_expired(from);
1716a961 408 }
a50feda5 409 return false;
1da177e4
LT		 410}
411
b1d40991
DA		 412void fib6_select_path(const struct net *net, struct fib6_result *res,
413 struct flowi6 *fl6, int oif, bool have_oif_match,
414 const struct sk_buff *skb, int strict)
51ebd318 415{
8d1c802b 416 struct fib6_info *sibling, *next_sibling;
b1d40991
DA		 417 struct fib6_info *match = res->f6i;
418
34fe5a1c 419 if (!match->nh && (!match->fib6_nsiblings || have_oif_match))
b1d40991 420 goto out;
51ebd318 421
34fe5a1c
DA		 422 if (match->nh && have_oif_match && res->nh)
423 return;
424
b673d6cc
JS		 425 /* We might have already computed the hash for ICMPv6 errors. In such
426 * case it will always be non-zero. Otherwise now is the time to do it.
427 */
f88d8ea6
DA		 428 if (!fl6->mp_hash &&
429 (!match->nh || nexthop_is_multipath(match->nh)))
b4bac172 430 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
b673d6cc 431
f88d8ea6
DA		 432 if (unlikely(match->nh)) {
433 nexthop_path_fib6_result(res, fl6->mp_hash);
434 return;
435 }
436
1cf844c7 437 if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound))
b1d40991 438 goto out;
3d709f69 439
93c2fb25
DA		 440 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
441 fib6_siblings) {
1cf844c7 442 const struct fib6_nh *nh = sibling->fib6_nh;
5e670d84
DA		 443 int nh_upper_bound;
444
702cea56 445 nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
5e670d84 446 if (fl6->mp_hash > nh_upper_bound)
3d709f69 447 continue;
702cea56 448 if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
3d709f69
IS		 449 break;
450 match = sibling;
451 break;
452 }
453
b1d40991
DA		 454out:
455 res->f6i = match;
1cf844c7 456 res->nh = match->fib6_nh;
51ebd318
ND		 457}
458
1da177e4 459/*
66f5d6ce 460 * Route lookup. rcu_read_lock() should be held.
1da177e4
LT		 461 */
462
0c59d006
DA		 463static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
464 const struct in6_addr *saddr, int oif, int flags)
465{
466 const struct net_device *dev;
467
468 if (nh->fib_nh_flags & RTNH_F_DEAD)
469 return false;
470
471 dev = nh->fib_nh_dev;
472 if (oif) {
473 if (dev->ifindex == oif)
474 return true;
475 } else {
476 if (ipv6_chk_addr(net, saddr, dev,
477 flags & RT6_LOOKUP_F_IFACE))
478 return true;
479 }
480
481 return false;
482}
483
962b6803
DA		 484struct fib6_nh_dm_arg {
485 struct net *net;
486 const struct in6_addr *saddr;
487 int oif;
488 int flags;
489 struct fib6_nh *nh;
490};
491
492static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg)
493{
494 struct fib6_nh_dm_arg *arg = _arg;
495
496 arg->nh = nh;
497 return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif,
498 arg->flags);
499}
500
501/* returns fib6_nh from nexthop or NULL */
502static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh,
503 struct fib6_result *res,
504 const struct in6_addr *saddr,
505 int oif, int flags)
506{
507 struct fib6_nh_dm_arg arg = {
508 .net = net,
509 .saddr = saddr,
510 .oif = oif,
511 .flags = flags,
512 };
513
514 if (nexthop_is_blackhole(nh))
515 return NULL;
516
517 if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg))
518 return arg.nh;
519
520 return NULL;
521}
522
75ef7389
DA		 523static void rt6_device_match(struct net *net, struct fib6_result *res,
524 const struct in6_addr *saddr, int oif, int flags)
1da177e4 525{
75ef7389
DA		 526 struct fib6_info *f6i = res->f6i;
527 struct fib6_info *spf6i;
528 struct fib6_nh *nh;
1da177e4 529
75ef7389 530 if (!oif && ipv6_addr_any(saddr)) {
f88d8ea6
DA		 531 if (unlikely(f6i->nh)) {
532 nh = nexthop_fib6_nh(f6i->nh);
533 if (nexthop_is_blackhole(f6i->nh))
534 goto out_blackhole;
535 } else {
536 nh = f6i->fib6_nh;
537 }
7d21fec9
DA		 538 if (!(nh->fib_nh_flags & RTNH_F_DEAD))
539 goto out;
75ef7389 540 }
dd3abc4e 541
75ef7389 542 for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
962b6803
DA		 543 bool matched = false;
544
545 if (unlikely(spf6i->nh)) {
546 nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr,
547 oif, flags);
548 if (nh)
549 matched = true;
550 } else {
551 nh = spf6i->fib6_nh;
552 if (__rt6_device_match(net, nh, saddr, oif, flags))
553 matched = true;
554 }
555 if (matched) {
75ef7389 556 res->f6i = spf6i;
7d21fec9 557 goto out;
75ef7389 558 }
dd3abc4e 559 }
1da177e4 560
75ef7389
DA		 561 if (oif && flags & RT6_LOOKUP_F_IFACE) {
562 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 563 nh = res->f6i->fib6_nh;
7d21fec9 564 goto out;
75ef7389 565 }
8067bb8c 566
f88d8ea6
DA		 567 if (unlikely(f6i->nh)) {
568 nh = nexthop_fib6_nh(f6i->nh);
569 if (nexthop_is_blackhole(f6i->nh))
570 goto out_blackhole;
571 } else {
572 nh = f6i->fib6_nh;
573 }
574
7d21fec9 575 if (nh->fib_nh_flags & RTNH_F_DEAD) {
75ef7389 576 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 577 nh = res->f6i->fib6_nh;
75ef7389 578 }
7d21fec9
DA		 579out:
580 res->nh = nh;
581 res->fib6_type = res->f6i->fib6_type;
582 res->fib6_flags = res->f6i->fib6_flags;
f88d8ea6
DA		 583 return;
584
585out_blackhole:
586 res->fib6_flags |= RTF_REJECT;
587 res->fib6_type = RTN_BLACKHOLE;
588 res->nh = nh;
1da177e4
LT		 589}
590
27097255 591#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 592struct __rt6_probe_work {
593 struct work_struct work;
594 struct in6_addr target;
595 struct net_device *dev;
596};
597
598static void rt6_probe_deferred(struct work_struct *w)
599{
600 struct in6_addr mcaddr;
601 struct __rt6_probe_work *work =
602 container_of(w, struct __rt6_probe_work, work);
603
604 addrconf_addr_solict_mult(&work->target, &mcaddr);
adc176c5 605 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
c2f17e82 606 dev_put(work->dev);
662f5533 607 kfree(work);
c2f17e82
HFS		 608}
609
cc3a86c8 610static void rt6_probe(struct fib6_nh *fib6_nh)
27097255 611{
f547fac6 612 struct __rt6_probe_work *work = NULL;
5e670d84 613 const struct in6_addr *nh_gw;
1bef4c22 614 unsigned long last_probe;
f2c31e32 615 struct neighbour *neigh;
5e670d84 616 struct net_device *dev;
f547fac6 617 struct inet6_dev *idev;
5e670d84 618
27097255
YH		 619 /*
620 * Okay, this does not seem to be appropriate
621 * for now, however, we need to check if it
622 * is really so; aka Router Reachability Probing.
623 *
624 * Router Reachability Probe MUST be rate-limited
625 * to no more than one per minute.
626 */
004b3942 627 if (!fib6_nh->fib_nh_gw_family)
7ff74a59 628 return;
5e670d84 629
cc3a86c8
DA		 630 nh_gw = &fib6_nh->fib_nh_gw6;
631 dev = fib6_nh->fib_nh_dev;
2152caea 632 rcu_read_lock_bh();
1bef4c22 633 last_probe = READ_ONCE(fib6_nh->last_probe);
f547fac6 634 idev = __in6_dev_get(dev);
5e670d84 635 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
2152caea 636 if (neigh) {
8d6c31bf
MKL		 637 if (neigh->nud_state & NUD_VALID)
638 goto out;
639
2152caea 640 write_lock(&neigh->lock);
990edb42
MKL		 641 if (!(neigh->nud_state & NUD_VALID) &&
642 time_after(jiffies,
dcd1f572 643 neigh->updated + idev->cnf.rtr_probe_interval)) {
990edb42
MKL		 644 work = kmalloc(sizeof(*work), GFP_ATOMIC);
645 if (work)
646 __neigh_set_probe_once(neigh);
c2f17e82 647 }
2152caea 648 write_unlock(&neigh->lock);
1bef4c22 649 } else if (time_after(jiffies, last_probe +
f547fac6 650 idev->cnf.rtr_probe_interval)) {
990edb42 651 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 652 }
990edb42 653
1bef4c22
ED		 654 if (!work || cmpxchg(&fib6_nh->last_probe,
655 last_probe, jiffies) != last_probe) {
656 kfree(work);
657 } else {
990edb42 658 INIT_WORK(&work->work, rt6_probe_deferred);
5e670d84
DA		 659 work->target = *nh_gw;
660 dev_hold(dev);
661 work->dev = dev;
990edb42
MKL		 662 schedule_work(&work->work);
663 }
664
8d6c31bf 665out:
2152caea 666 rcu_read_unlock_bh();
27097255
YH		 667}
668#else
cc3a86c8 669static inline void rt6_probe(struct fib6_nh *fib6_nh)
27097255 670{
27097255
YH		 671}
672#endif
673
1da177e4 674/*
554cfb7e 675 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 676 */
1ba9a895 677static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
1da177e4 678{
afc154e9 679 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
5e670d84 680 struct neighbour *neigh;
f2c31e32 681
145a3621 682 rcu_read_lock_bh();
1ba9a895
DA		 683 neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
684 &fib6_nh->fib_nh_gw6);
145a3621
YH		 685 if (neigh) {
686 read_lock(&neigh->lock);
554cfb7e 687 if (neigh->nud_state & NUD_VALID)
afc154e9 688 ret = RT6_NUD_SUCCEED;
398bcbeb 689#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 690 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 691 ret = RT6_NUD_SUCCEED;
7e980569
JB		 692 else
693 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 694#endif
145a3621 695 read_unlock(&neigh->lock);
afc154e9
HFS		 696 } else {
697 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 698 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 699 }
145a3621
YH		 700 rcu_read_unlock_bh();
701
a5a81f0b 702 return ret;
1da177e4
LT		 703}
704
702cea56
DA		 705static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
706 int strict)
1da177e4 707{
6e1809a5
DA		 708 int m = 0;
709
710 if (!oif || nh->fib_nh_dev->ifindex == oif)
711 m = 2;
1ab1457c 712
77d16f45 713 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 714 return RT6_NUD_FAIL_HARD;
ebacaaa0 715#ifdef CONFIG_IPV6_ROUTER_PREF
702cea56 716 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
ebacaaa0 717#endif
1ba9a895 718 if ((strict & RT6_LOOKUP_F_REACHABLE) &&
702cea56 719 !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
1ba9a895 720 int n = rt6_check_neigh(nh);
afc154e9
HFS		 721 if (n < 0)
722 return n;
723 }
554cfb7e
YH		 724 return m;
725}
726
28679ed1
DA		 727static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
728 int oif, int strict, int *mpri, bool *do_rr)
554cfb7e 729{
afc154e9 730 bool match_do_rr = false;
28679ed1
DA		 731 bool rc = false;
732 int m;
35103d11 733
28679ed1 734 if (nh->fib_nh_flags & RTNH_F_DEAD)
8067bb8c
IS		 735 goto out;
736
28679ed1
DA		 737 if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
738 nh->fib_nh_flags & RTNH_F_LINKDOWN &&
d5d32e4b 739 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
35103d11 740 goto out;
f11e6659 741
28679ed1 742 m = rt6_score_route(nh, fib6_flags, oif, strict);
7e980569 743 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 744 match_do_rr = true;
745 m = 0; /* lowest valid score */
7e980569 746 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 747 goto out;
afc154e9
HFS		 748 }
749
750 if (strict & RT6_LOOKUP_F_REACHABLE)
28679ed1 751 rt6_probe(nh);
f11e6659 752
7e980569 753 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 754 if (m > *mpri) {
afc154e9 755 *do_rr = match_do_rr;
f11e6659 756 *mpri = m;
28679ed1 757 rc = true;
f11e6659 758 }
f11e6659 759out:
28679ed1 760 return rc;
f11e6659
DM		 761}
762
17a5984e
DA		 763struct fib6_nh_frl_arg {
764 u32 flags;
765 int oif;
766 int strict;
767 int *mpri;
768 bool *do_rr;
769 struct fib6_nh *nh;
770};
771
772static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg)
773{
774 struct fib6_nh_frl_arg *arg = _arg;
775
776 arg->nh = nh;
777 return find_match(nh, arg->flags, arg->oif, arg->strict,
778 arg->mpri, arg->do_rr);
779}
780
b7bc4b6a 781static void __find_rr_leaf(struct fib6_info *f6i_start,
30c15f03 782 struct fib6_info *nomatch, u32 metric,
b7bc4b6a 783 struct fib6_result *res, struct fib6_info **cont,
30c15f03 784 int oif, int strict, bool *do_rr, int *mpri)
f11e6659 785{
b7bc4b6a 786 struct fib6_info *f6i;
1da177e4 787
b7bc4b6a
DA		 788 for (f6i = f6i_start;
789 f6i && f6i != nomatch;
790 f6i = rcu_dereference(f6i->fib6_next)) {
17a5984e 791 bool matched = false;
30c15f03
DA		 792 struct fib6_nh *nh;
793
b7bc4b6a
DA		 794 if (cont && f6i->fib6_metric != metric) {
795 *cont = f6i;
30c15f03 796 return;
9fbdcfaf
SK		 797 }
798
b7bc4b6a 799 if (fib6_check_expired(f6i))
28679ed1
DA		 800 continue;
801
17a5984e
DA		 802 if (unlikely(f6i->nh)) {
803 struct fib6_nh_frl_arg arg = {
804 .flags = f6i->fib6_flags,
805 .oif = oif,
806 .strict = strict,
807 .mpri = mpri,
808 .do_rr = do_rr
809 };
810
811 if (nexthop_is_blackhole(f6i->nh)) {
812 res->fib6_flags = RTF_REJECT;
813 res->fib6_type = RTN_BLACKHOLE;
814 res->f6i = f6i;
815 res->nh = nexthop_fib6_nh(f6i->nh);
816 return;
817 }
818 if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match,
819 &arg)) {
820 matched = true;
821 nh = arg.nh;
822 }
823 } else {
824 nh = f6i->fib6_nh;
825 if (find_match(nh, f6i->fib6_flags, oif, strict,
826 mpri, do_rr))
827 matched = true;
828 }
829 if (matched) {
b7bc4b6a
DA		 830 res->f6i = f6i;
831 res->nh = nh;
7d21fec9
DA		 832 res->fib6_flags = f6i->fib6_flags;
833 res->fib6_type = f6i->fib6_type;
b7bc4b6a 834 }
9fbdcfaf 835 }
30c15f03 836}
9fbdcfaf 837
b7bc4b6a
DA		 838static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
839 struct fib6_info *rr_head, int oif, int strict,
840 bool *do_rr, struct fib6_result *res)
30c15f03 841{
b7bc4b6a
DA		 842 u32 metric = rr_head->fib6_metric;
843 struct fib6_info *cont = NULL;
30c15f03 844 int mpri = -1;
9fbdcfaf 845
b7bc4b6a 846 __find_rr_leaf(rr_head, NULL, metric, res, &cont,
30c15f03 847 oif, strict, do_rr, &mpri);
28679ed1 848
b7bc4b6a 849 __find_rr_leaf(leaf, rr_head, metric, res, &cont,
30c15f03 850 oif, strict, do_rr, &mpri);
9fbdcfaf 851
b7bc4b6a
DA		 852 if (res->f6i || !cont)
853 return;
9fbdcfaf 854
b7bc4b6a 855 __find_rr_leaf(cont, NULL, metric, res, NULL,
30c15f03 856 oif, strict, do_rr, &mpri);
f11e6659 857}
1da177e4 858
b7bc4b6a
DA		 859static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
860 struct fib6_result *res, int strict)
f11e6659 861{
8d1c802b 862 struct fib6_info *leaf = rcu_dereference(fn->leaf);
b7bc4b6a 863 struct fib6_info *rt0;
afc154e9 864 bool do_rr = false;
17ecf590 865 int key_plen;
1da177e4 866
b7bc4b6a
DA		 867 /* make sure this function or its helpers sets f6i */
868 res->f6i = NULL;
869
421842ed 870 if (!leaf || leaf == net->ipv6.fib6_null_entry)
b7bc4b6a 871 goto out;
8d1040e8 872
66f5d6ce 873 rt0 = rcu_dereference(fn->rr_ptr);
f11e6659 874 if (!rt0)
66f5d6ce 875 rt0 = leaf;
1da177e4 876
17ecf590
WW		 877 /* Double check to make sure fn is not an intermediate node
878 * and fn->leaf does not points to its child's leaf
879 * (This might happen if all routes under fn are deleted from
880 * the tree and fib6_repair_tree() is called on the node.)
881 */
93c2fb25 882 key_plen = rt0->fib6_dst.plen;
17ecf590 883#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 884 if (rt0->fib6_src.plen)
885 key_plen = rt0->fib6_src.plen;
17ecf590
WW		 886#endif
887 if (fn->fn_bit != key_plen)
b7bc4b6a 888 goto out;
1da177e4 889
b7bc4b6a 890 find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
afc154e9 891 if (do_rr) {
8fb11a9a 892 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
f11e6659 893
554cfb7e 894 /* no entries matched; do round-robin */
93c2fb25 895 if (!next || next->fib6_metric != rt0->fib6_metric)
8d1040e8 896 next = leaf;
f11e6659 897
66f5d6ce 898 if (next != rt0) {
93c2fb25 899 spin_lock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 900 /* make sure next is not being deleted from the tree */
93c2fb25 901 if (next->fib6_node)
66f5d6ce 902 rcu_assign_pointer(fn->rr_ptr, next);
93c2fb25 903 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 904 }
1da177e4 905 }
1da177e4 906
b7bc4b6a
DA		 907out:
908 if (!res->f6i) {
909 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 910 res->nh = res->f6i->fib6_nh;
7d21fec9
DA		 911 res->fib6_flags = res->f6i->fib6_flags;
912 res->fib6_type = res->f6i->fib6_type;
b7bc4b6a 913 }
1da177e4
LT		 914}
915
85bd05de 916static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
8b9df265 917{
85bd05de
DA		 918 return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
919 res->nh->fib_nh_gw_family;
8b9df265
MKL		 920}
921
70ceb4f5
YH		 922#ifdef CONFIG_IPV6_ROUTE_INFO
923int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 924 const struct in6_addr *gwaddr)
70ceb4f5 925{
c346dca1 926 struct net *net = dev_net(dev);
70ceb4f5
YH		 927 struct route_info *rinfo = (struct route_info *) opt;
928 struct in6_addr prefix_buf, *prefix;
929 unsigned int pref;
4bed72e4 930 unsigned long lifetime;
8d1c802b 931 struct fib6_info *rt;
70ceb4f5
YH		 932
933 if (len < sizeof(struct route_info)) {
934 return -EINVAL;
935 }
936
937 /* Sanity check for prefix_len and length */
938 if (rinfo->length > 3) {
939 return -EINVAL;
940 } else if (rinfo->prefix_len > 128) {
941 return -EINVAL;
942 } else if (rinfo->prefix_len > 64) {
943 if (rinfo->length < 2) {
944 return -EINVAL;
945 }
946 } else if (rinfo->prefix_len > 0) {
947 if (rinfo->length < 1) {
948 return -EINVAL;
949 }
950 }
951
952 pref = rinfo->route_pref;
953 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 954 return -EINVAL;
70ceb4f5 955
4bed72e4 956 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 957
958 if (rinfo->length == 3)
959 prefix = (struct in6_addr *)rinfo->prefix;
960 else {
961 /* this function is safe */
962 ipv6_addr_prefix(&prefix_buf,
963 (struct in6_addr *)rinfo->prefix,
964 rinfo->prefix_len);
965 prefix = &prefix_buf;
966 }
967
f104a567 968 if (rinfo->prefix_len == 0)
afb1d4b5 969 rt = rt6_get_dflt_router(net, gwaddr, dev);
f104a567
DJ		 970 else
971 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
830218c1 972 gwaddr, dev);
70ceb4f5
YH		 973
974 if (rt && !lifetime) {
11dd74b3 975 ip6_del_rt(net, rt, false);
70ceb4f5
YH		 976 rt = NULL;
977 }
978
979 if (!rt && lifetime)
830218c1
DA		 980 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
981 dev, pref);
70ceb4f5 982 else if (rt)
93c2fb25
DA		 983 rt->fib6_flags = RTF_ROUTEINFO |
984 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
70ceb4f5
YH		 985
986 if (rt) {
1716a961 987 if (!addrconf_finite_timeout(lifetime))
14895687 988 fib6_clean_expires(rt);
1716a961 989 else
14895687 990 fib6_set_expires(rt, jiffies + HZ * lifetime);
1716a961 991
93531c67 992 fib6_info_release(rt);
70ceb4f5
YH		 993 }
994 return 0;
995}
996#endif
997
ae90d867
DA		 998/*
999 * Misc support functions
1000 */
1001
1002/* called with rcu_lock held */
0d161581 1003static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
ae90d867 1004{
0d161581 1005 struct net_device *dev = res->nh->fib_nh_dev;
ae90d867 1006
7d21fec9 1007 if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
ae90d867
DA		 1008 /* for copies of local routes, dst->dev needs to be the
1009 * device if it is a master device, the master device if
1010 * device is enslaved, and the loopback as the default
1011 */
1012 if (netif_is_l3_slave(dev) &&
7d21fec9 1013 !rt6_need_strict(&res->f6i->fib6_dst.addr))
ae90d867
DA		 1014 dev = l3mdev_master_dev_rcu(dev);
1015 else if (!netif_is_l3_master(dev))
1016 dev = dev_net(dev)->loopback_dev;
1017 /* last case is netif_is_l3_master(dev) is true in which
1018 * case we want dev returned to be dev
1019 */
1020 }
1021
1022 return dev;
1023}
1024
6edb3c96
DA		 1025static const int fib6_prop[RTN_MAX + 1] = {
1026 [RTN_UNSPEC] = 0,
1027 [RTN_UNICAST] = 0,
1028 [RTN_LOCAL] = 0,
1029 [RTN_BROADCAST] = 0,
1030 [RTN_ANYCAST] = 0,
1031 [RTN_MULTICAST] = 0,
1032 [RTN_BLACKHOLE] = -EINVAL,
1033 [RTN_UNREACHABLE] = -EHOSTUNREACH,
1034 [RTN_PROHIBIT] = -EACCES,
1035 [RTN_THROW] = -EAGAIN,
1036 [RTN_NAT] = -EINVAL,
1037 [RTN_XRESOLVE] = -EINVAL,
1038};
1039
1040static int ip6_rt_type_to_error(u8 fib6_type)
1041{
1042 return fib6_prop[fib6_type];
1043}
1044
8d1c802b 1045static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
3b6761d1
DA		 1046{
1047 unsigned short flags = 0;
1048
1049 if (rt->dst_nocount)
1050 flags |= DST_NOCOUNT;
1051 if (rt->dst_nopolicy)
1052 flags |= DST_NOPOLICY;
3b6761d1
DA		 1053
1054 return flags;
1055}
1056
7d21fec9 1057static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
6edb3c96 1058{
7d21fec9 1059 rt->dst.error = ip6_rt_type_to_error(fib6_type);
6edb3c96 1060
7d21fec9 1061 switch (fib6_type) {
6edb3c96
DA		 1062 case RTN_BLACKHOLE:
1063 rt->dst.output = dst_discard_out;
1064 rt->dst.input = dst_discard;
1065 break;
1066 case RTN_PROHIBIT:
1067 rt->dst.output = ip6_pkt_prohibit_out;
1068 rt->dst.input = ip6_pkt_prohibit;
1069 break;
1070 case RTN_THROW:
1071 case RTN_UNREACHABLE:
1072 default:
1073 rt->dst.output = ip6_pkt_discard_out;
1074 rt->dst.input = ip6_pkt_discard;
1075 break;
1076 }
1077}
1078
0d161581 1079static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
6edb3c96 1080{
7d21fec9 1081 struct fib6_info *f6i = res->f6i;
0d161581 1082
7d21fec9
DA		 1083 if (res->fib6_flags & RTF_REJECT) {
1084 ip6_rt_init_dst_reject(rt, res->fib6_type);
6edb3c96
DA		 1085 return;
1086 }
1087
1088 rt->dst.error = 0;
1089 rt->dst.output = ip6_output;
1090
7d21fec9 1091 if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
6edb3c96 1092 rt->dst.input = ip6_input;
7d21fec9 1093 } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
6edb3c96
DA		 1094 rt->dst.input = ip6_mc_input;
1095 } else {
1096 rt->dst.input = ip6_forward;
1097 }
1098
0d161581
DA		 1099 if (res->nh->fib_nh_lws) {
1100 rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
6edb3c96
DA		 1101 lwtunnel_set_redirect(&rt->dst);
1102 }
1103
1104 rt->dst.lastuse = jiffies;
1105}
1106
e873e4b9 1107/* Caller must already hold reference to @from */
8d1c802b 1108static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
ae90d867 1109{
ae90d867 1110 rt->rt6i_flags &= ~RTF_EXPIRES;
a68886a6 1111 rcu_assign_pointer(rt->from, from);
e1255ed4 1112 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
ae90d867
DA		 1113}
1114
0d161581
DA		 1115/* Caller must already hold reference to f6i in result */
1116static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
ae90d867 1117{
0d161581
DA		 1118 const struct fib6_nh *nh = res->nh;
1119 const struct net_device *dev = nh->fib_nh_dev;
1120 struct fib6_info *f6i = res->f6i;
dcd1f572 1121
0d161581 1122 ip6_rt_init_dst(rt, res);
6edb3c96 1123
0d161581 1124 rt->rt6i_dst = f6i->fib6_dst;
dcd1f572 1125 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
7d21fec9 1126 rt->rt6i_flags = res->fib6_flags;
0d161581
DA		 1127 if (nh->fib_nh_gw_family) {
1128 rt->rt6i_gateway = nh->fib_nh_gw6;
2b2450ca
DA		 1129 rt->rt6i_flags |= RTF_GATEWAY;
1130 }
0d161581 1131 rt6_set_from(rt, f6i);
ae90d867 1132#ifdef CONFIG_IPV6_SUBTREES
0d161581 1133 rt->rt6i_src = f6i->fib6_src;
ae90d867 1134#endif
ae90d867
DA		 1135}
1136
a3c00e46
MKL		 1137static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
1138 struct in6_addr *saddr)
1139{
66f5d6ce 1140 struct fib6_node *pn, *sn;
a3c00e46
MKL		 1141 while (1) {
1142 if (fn->fn_flags & RTN_TL_ROOT)
1143 return NULL;
66f5d6ce
WW		 1144 pn = rcu_dereference(fn->parent);
1145 sn = FIB6_SUBTREE(pn);
1146 if (sn && sn != fn)
6454743b 1147 fn = fib6_node_lookup(sn, NULL, saddr);
a3c00e46
MKL		 1148 else
1149 fn = pn;
1150 if (fn->fn_flags & RTN_RTINFO)
1151 return fn;
1152 }
1153}
c71099ac 1154
10585b43 1155static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
d3843fe5
WW		 1156{
1157 struct rt6_info *rt = *prt;
1158
1159 if (dst_hold_safe(&rt->dst))
1160 return true;
10585b43 1161 if (net) {
d3843fe5
WW		 1162 rt = net->ipv6.ip6_null_entry;
1163 dst_hold(&rt->dst);
1164 } else {
1165 rt = NULL;
1166 }
1167 *prt = rt;
1168 return false;
1169}
1170
dec9b0e2 1171/* called with rcu_lock held */
9b6b35ab 1172static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
dec9b0e2 1173{
9b6b35ab
DA		 1174 struct net_device *dev = res->nh->fib_nh_dev;
1175 struct fib6_info *f6i = res->f6i;
1176 unsigned short flags;
dec9b0e2
DA		 1177 struct rt6_info *nrt;
1178
9b6b35ab 1179 if (!fib6_info_hold_safe(f6i))
1c87e79a 1180 goto fallback;
e873e4b9 1181
9b6b35ab 1182 flags = fib6_info_dst_flags(f6i);
93531c67 1183 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
1c87e79a 1184 if (!nrt) {
9b6b35ab 1185 fib6_info_release(f6i);
1c87e79a
XL		 1186 goto fallback;
1187 }
dec9b0e2 1188
0d161581 1189 ip6_rt_copy_init(nrt, res);
1c87e79a
XL		 1190 return nrt;
1191
1192fallback:
1193 nrt = dev_net(dev)->ipv6.ip6_null_entry;
1194 dst_hold(&nrt->dst);
dec9b0e2
DA		 1195 return nrt;
1196}
1197
55cced4f 1198INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net,
8ed67789 1199 struct fib6_table *table,
b75cc8f9
DA		 1200 struct flowi6 *fl6,
1201 const struct sk_buff *skb,
1202 int flags)
1da177e4 1203{
b1d40991 1204 struct fib6_result res = {};
1da177e4 1205 struct fib6_node *fn;
23fb93a4 1206 struct rt6_info *rt;
1da177e4 1207
b6cdbc85
DA		 1208 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1209 flags &= ~RT6_LOOKUP_F_IFACE;
1210
66f5d6ce 1211 rcu_read_lock();
6454743b 1212 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac 1213restart:
b1d40991
DA		 1214 res.f6i = rcu_dereference(fn->leaf);
1215 if (!res.f6i)
1216 res.f6i = net->ipv6.fib6_null_entry;
af52a52c 1217 else
75ef7389
DA		 1218 rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
1219 flags);
af52a52c 1220
b1d40991 1221 if (res.f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 1222 fn = fib6_backtrack(fn, &fl6->saddr);
1223 if (fn)
1224 goto restart;
2b760fcf 1225
af52a52c
DA		 1226 rt = net->ipv6.ip6_null_entry;
1227 dst_hold(&rt->dst);
1228 goto out;
f88d8ea6
DA		 1229 } else if (res.fib6_flags & RTF_REJECT) {
1230 goto do_create;
af52a52c 1231 }
d3843fe5 1232
b1d40991
DA		 1233 fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
1234 fl6->flowi6_oif != 0, skb, flags);
1235
2b760fcf 1236 /* Search through exception table */
7e4b5128 1237 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
23fb93a4 1238 if (rt) {
10585b43 1239 if (ip6_hold_safe(net, &rt))
dec9b0e2 1240 dst_use_noref(&rt->dst, jiffies);
23fb93a4 1241 } else {
f88d8ea6 1242do_create:
9b6b35ab 1243 rt = ip6_create_rt_rcu(&res);
dec9b0e2 1244 }
b811580d 1245
af52a52c 1246out:
8ff2e5b2 1247 trace_fib6_table_lookup(net, &res, table, fl6);
af52a52c 1248
66f5d6ce 1249 rcu_read_unlock();
b811580d 1250
c71099ac 1251 return rt;
c71099ac
TG		 1252}
1253
67ba4152 1254struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
b75cc8f9 1255 const struct sk_buff *skb, int flags)
ea6e574e 1256{
b75cc8f9 1257 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
ea6e574e
FW		 1258}
1259EXPORT_SYMBOL_GPL(ip6_route_lookup);
1260
9acd9f3a 1261struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
b75cc8f9
DA		 1262 const struct in6_addr *saddr, int oif,
1263 const struct sk_buff *skb, int strict)
c71099ac 1264{
4c9483b2
DM		 1265 struct flowi6 fl6 = {
1266 .flowi6_oif = oif,
1267 .daddr = *daddr,
c71099ac
TG		 1268 };
1269 struct dst_entry *dst;
77d16f45 1270 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 1271
adaa70bb 1272 if (saddr) {
4c9483b2 1273 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 1274 flags |= RT6_LOOKUP_F_HAS_SADDR;
1275 }
1276
b75cc8f9 1277 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
c71099ac
TG		 1278 if (dst->error == 0)
1279 return (struct rt6_info *) dst;
1280
1281 dst_release(dst);
1282
1da177e4
LT		 1283 return NULL;
1284}
7159039a
YH		 1285EXPORT_SYMBOL(rt6_lookup);
1286
c71099ac 1287/* ip6_ins_rt is called with FREE table->tb6_lock.
1cfb71ee
WW		 1288 * It takes new route entry, the addition fails by any reason the
1289 * route is released.
1290 * Caller must hold dst before calling it.
1da177e4
LT		 1291 */
1292
8d1c802b 1293static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
333c4301 1294 struct netlink_ext_ack *extack)
1da177e4
LT		 1295{
1296 int err;
c71099ac 1297 struct fib6_table *table;
1da177e4 1298
93c2fb25 1299 table = rt->fib6_table;
66f5d6ce 1300 spin_lock_bh(&table->tb6_lock);
d4ead6b3 1301 err = fib6_add(&table->tb6_root, rt, info, extack);
66f5d6ce 1302 spin_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1303
1304 return err;
1305}
1306
8d1c802b 1307int ip6_ins_rt(struct net *net, struct fib6_info *rt)
40e22e8f 1308{
afb1d4b5 1309 struct nl_info info = { .nl_net = net, };
e715b6d3 1310
d4ead6b3 1311 return __ip6_ins_rt(rt, &info, NULL);
40e22e8f
TG		 1312}
1313
85bd05de 1314static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
8b9df265
MKL		 1315 const struct in6_addr *daddr,
1316 const struct in6_addr *saddr)
1da177e4 1317{
85bd05de 1318 struct fib6_info *f6i = res->f6i;
4832c30d 1319 struct net_device *dev;
1da177e4
LT		 1320 struct rt6_info *rt;
1321
1322 /*
1323 * Clone the route.
1324 */
1325
85bd05de 1326 if (!fib6_info_hold_safe(f6i))
e873e4b9
WW		 1327 return NULL;
1328
0d161581 1329 dev = ip6_rt_get_dev_rcu(res);
93531c67 1330 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
e873e4b9 1331 if (!rt) {
85bd05de 1332 fib6_info_release(f6i);
83a09abd 1333 return NULL;
e873e4b9 1334 }
83a09abd 1335
0d161581 1336 ip6_rt_copy_init(rt, res);
83a09abd 1337 rt->rt6i_flags |= RTF_CACHE;
83a09abd
MKL		 1338 rt->rt6i_dst.addr = *daddr;
1339 rt->rt6i_dst.plen = 128;
1da177e4 1340
85bd05de
DA		 1341 if (!rt6_is_gw_or_nonexthop(res)) {
1342 if (f6i->fib6_dst.plen != 128 &&
1343 ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
83a09abd 1344 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 1345#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 1346 if (rt->rt6i_src.plen && saddr) {
1347 rt->rt6i_src.addr = *saddr;
1348 rt->rt6i_src.plen = 128;
8b9df265 1349 }
83a09abd 1350#endif
95a9a5ba 1351 }
1da177e4 1352
95a9a5ba
YH		 1353 return rt;
1354}
1da177e4 1355
db3fedee 1356static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
d52d3997 1357{
db3fedee
DA		 1358 struct fib6_info *f6i = res->f6i;
1359 unsigned short flags = fib6_info_dst_flags(f6i);
4832c30d 1360 struct net_device *dev;
d52d3997
MKL		 1361 struct rt6_info *pcpu_rt;
1362
db3fedee 1363 if (!fib6_info_hold_safe(f6i))
e873e4b9
WW		 1364 return NULL;
1365
4832c30d 1366 rcu_read_lock();
0d161581 1367 dev = ip6_rt_get_dev_rcu(res);
d8882935 1368 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT);
4832c30d 1369 rcu_read_unlock();
e873e4b9 1370 if (!pcpu_rt) {
db3fedee 1371 fib6_info_release(f6i);
d52d3997 1372 return NULL;
e873e4b9 1373 }
0d161581 1374 ip6_rt_copy_init(pcpu_rt, res);
d52d3997 1375 pcpu_rt->rt6i_flags |= RTF_PCPU;
8f34e53b
DA		 1376
1377 if (f6i->nh)
1378 pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev));
1379
d52d3997
MKL		 1380 return pcpu_rt;
1381}
1382
8f34e53b
DA		 1383static bool rt6_is_valid(const struct rt6_info *rt6)
1384{
1385 return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev));
1386}
1387
66f5d6ce 1388/* It should be called with rcu_read_lock() acquired */
db3fedee 1389static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
d52d3997 1390{
c353071a 1391 struct rt6_info *pcpu_rt;
d52d3997 1392
c353071a 1393 pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu);
d52d3997 1394
8f34e53b
DA		 1395 if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) {
1396 struct rt6_info *prev, **p;
1397
1398 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1399 prev = xchg(p, NULL);
1400 if (prev) {
1401 dst_dev_put(&prev->dst);
1402 dst_release(&prev->dst);
1403 }
1404
1405 pcpu_rt = NULL;
1406 }
1407
a73e4195
MKL		 1408 return pcpu_rt;
1409}
1410
afb1d4b5 1411static struct rt6_info *rt6_make_pcpu_route(struct net *net,
db3fedee 1412 const struct fib6_result *res)
a73e4195
MKL		 1413{
1414 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997 1415
db3fedee 1416 pcpu_rt = ip6_rt_pcpu_alloc(res);
0e09edcc
WW		 1417 if (!pcpu_rt)
1418 return NULL;
d52d3997 1419
f40b6ae2 1420 p = this_cpu_ptr(res->nh->rt6i_pcpu);
a94b9367 1421 prev = cmpxchg(p, NULL, pcpu_rt);
951f788a 1422 BUG_ON(prev);
a94b9367 1423
61fb0d01
ED		 1424 if (res->f6i->fib6_destroying) {
1425 struct fib6_info *from;
1426
1427 from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL);
1428 fib6_info_release(from);
1429 }
1430
d52d3997
MKL		 1431 return pcpu_rt;
1432}
1433
35732d01
WW		 1434/* exception hash table implementation
1435 */
1436static DEFINE_SPINLOCK(rt6_exception_lock);
1437
1438/* Remove rt6_ex from hash table and free the memory
1439 * Caller must hold rt6_exception_lock
1440 */
1441static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1442 struct rt6_exception *rt6_ex)
1443{
f5b51fe8 1444 struct fib6_info *from;
b2427e67 1445 struct net *net;
81eb8447 1446
35732d01
WW		 1447 if (!bucket || !rt6_ex)
1448 return;
b2427e67
CIK		 1449
1450 net = dev_net(rt6_ex->rt6i->dst.dev);
f5b51fe8
PA		 1451 net->ipv6.rt6_stats->fib_rt_cache--;
1452
1453 /* purge completely the exception to allow releasing the held resources:
1454 * some [sk] cache may keep the dst around for unlimited time
1455 */
0e233874 1456 from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
f5b51fe8
PA		 1457 fib6_info_release(from);
1458 dst_dev_put(&rt6_ex->rt6i->dst);
1459
35732d01 1460 hlist_del_rcu(&rt6_ex->hlist);
77634cc6 1461 dst_release(&rt6_ex->rt6i->dst);
35732d01
WW		 1462 kfree_rcu(rt6_ex, rcu);
1463 WARN_ON_ONCE(!bucket->depth);
1464 bucket->depth--;
1465}
1466
1467/* Remove oldest rt6_ex in bucket and free the memory
1468 * Caller must hold rt6_exception_lock
1469 */
1470static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1471{
1472 struct rt6_exception *rt6_ex, *oldest = NULL;
1473
1474 if (!bucket)
1475 return;
1476
1477 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1478 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1479 oldest = rt6_ex;
1480 }
1481 rt6_remove_exception(bucket, oldest);
1482}
1483
1484static u32 rt6_exception_hash(const struct in6_addr *dst,
1485 const struct in6_addr *src)
1486{
1487 static u32 seed __read_mostly;
1488 u32 val;
1489
1490 net_get_random_once(&seed, sizeof(seed));
b6b556af 1491 val = jhash2((const u32 *)dst, sizeof(*dst)/sizeof(u32), seed);
35732d01
WW		 1492
1493#ifdef CONFIG_IPV6_SUBTREES
1494 if (src)
b6b556af 1495 val = jhash2((const u32 *)src, sizeof(*src)/sizeof(u32), val);
35732d01
WW		 1496#endif
1497 return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1498}
1499
1500/* Helper function to find the cached rt in the hash table
1501 * and update bucket pointer to point to the bucket for this
1502 * (daddr, saddr) pair
1503 * Caller must hold rt6_exception_lock
1504 */
1505static struct rt6_exception *
1506__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1507 const struct in6_addr *daddr,
1508 const struct in6_addr *saddr)
1509{
1510 struct rt6_exception *rt6_ex;
1511 u32 hval;
1512
1513 if (!(*bucket) || !daddr)
1514 return NULL;
1515
1516 hval = rt6_exception_hash(daddr, saddr);
1517 *bucket += hval;
1518
1519 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1520 struct rt6_info *rt6 = rt6_ex->rt6i;
1521 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1522
1523#ifdef CONFIG_IPV6_SUBTREES
1524 if (matched && saddr)
1525 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1526#endif
1527 if (matched)
1528 return rt6_ex;
1529 }
1530 return NULL;
1531}
1532
1533/* Helper function to find the cached rt in the hash table
1534 * and update bucket pointer to point to the bucket for this
1535 * (daddr, saddr) pair
1536 * Caller must hold rcu_read_lock()
1537 */
1538static struct rt6_exception *
1539__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1540 const struct in6_addr *daddr,
1541 const struct in6_addr *saddr)
1542{
1543 struct rt6_exception *rt6_ex;
1544 u32 hval;
1545
1546 WARN_ON_ONCE(!rcu_read_lock_held());
1547
1548 if (!(*bucket) || !daddr)
1549 return NULL;
1550
1551 hval = rt6_exception_hash(daddr, saddr);
1552 *bucket += hval;
1553
1554 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1555 struct rt6_info *rt6 = rt6_ex->rt6i;
1556 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1557
1558#ifdef CONFIG_IPV6_SUBTREES
1559 if (matched && saddr)
1560 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1561#endif
1562 if (matched)
1563 return rt6_ex;
1564 }
1565 return NULL;
1566}
1567
b748f260 1568static unsigned int fib6_mtu(const struct fib6_result *res)
d4ead6b3 1569{
b748f260 1570 const struct fib6_nh *nh = res->nh;
d4ead6b3
DA		 1571 unsigned int mtu;
1572
b748f260
DA		 1573 if (res->f6i->fib6_pmtu) {
1574 mtu = res->f6i->fib6_pmtu;
dcd1f572 1575 } else {
b748f260 1576 struct net_device *dev = nh->fib_nh_dev;
dcd1f572
DA		 1577 struct inet6_dev *idev;
1578
1579 rcu_read_lock();
1580 idev = __in6_dev_get(dev);
1581 mtu = idev->cnf.mtu6;
1582 rcu_read_unlock();
1583 }
1584
d4ead6b3
DA		 1585 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1586
b748f260 1587 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
d4ead6b3
DA		 1588}
1589
cc5c073a
DA		 1590#define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL
1591
1592/* used when the flushed bit is not relevant, only access to the bucket
1593 * (ie., all bucket users except rt6_insert_exception);
1594 *
1595 * called under rcu lock; sometimes called with rt6_exception_lock held
1596 */
1597static
1598struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh,
1599 spinlock_t *lock)
1600{
1601 struct rt6_exception_bucket *bucket;
1602
1603 if (lock)
1604 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1605 lockdep_is_held(lock));
1606 else
1607 bucket = rcu_dereference(nh->rt6i_exception_bucket);
1608
1609 /* remove bucket flushed bit if set */
1610 if (bucket) {
1611 unsigned long p = (unsigned long)bucket;
1612
1613 p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED;
1614 bucket = (struct rt6_exception_bucket *)p;
1615 }
1616
1617 return bucket;
1618}
1619
1620static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket)
1621{
1622 unsigned long p = (unsigned long)bucket;
1623
1624 return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED);
1625}
1626
1627/* called with rt6_exception_lock held */
1628static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh,
1629 spinlock_t *lock)
1630{
1631 struct rt6_exception_bucket *bucket;
1632 unsigned long p;
1633
1634 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1635 lockdep_is_held(lock));
1636
1637 p = (unsigned long)bucket;
1638 p |= FIB6_EXCEPTION_BUCKET_FLUSHED;
1639 bucket = (struct rt6_exception_bucket *)p;
1640 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1641}
1642
35732d01 1643static int rt6_insert_exception(struct rt6_info *nrt,
5012f0a5 1644 const struct fib6_result *res)
35732d01 1645{
5e670d84 1646 struct net *net = dev_net(nrt->dst.dev);
35732d01 1647 struct rt6_exception_bucket *bucket;
cc5c073a 1648 struct fib6_info *f6i = res->f6i;
35732d01
WW		 1649 struct in6_addr *src_key = NULL;
1650 struct rt6_exception *rt6_ex;
cc5c073a 1651 struct fib6_nh *nh = res->nh;
35732d01
WW		 1652 int err = 0;
1653
35732d01
WW		 1654 spin_lock_bh(&rt6_exception_lock);
1655
cc5c073a
DA		 1656 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1657 lockdep_is_held(&rt6_exception_lock));
35732d01
WW		 1658 if (!bucket) {
1659 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1660 GFP_ATOMIC);
1661 if (!bucket) {
1662 err = -ENOMEM;
1663 goto out;
1664 }
cc5c073a
DA		 1665 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1666 } else if (fib6_nh_excptn_bucket_flushed(bucket)) {
1667 err = -EINVAL;
1668 goto out;
35732d01
WW		 1669 }
1670
1671#ifdef CONFIG_IPV6_SUBTREES
5012f0a5 1672 /* fib6_src.plen != 0 indicates f6i is in subtree
35732d01 1673 * and exception table is indexed by a hash of
5012f0a5 1674 * both fib6_dst and fib6_src.
35732d01 1675 * Otherwise, the exception table is indexed by
5012f0a5 1676 * a hash of only fib6_dst.
35732d01 1677 */
5012f0a5 1678 if (f6i->fib6_src.plen)
35732d01
WW		 1679 src_key = &nrt->rt6i_src.addr;
1680#endif
5012f0a5 1681 /* rt6_mtu_change() might lower mtu on f6i.
f5bbe7ee 1682 * Only insert this exception route if its mtu
5012f0a5 1683 * is less than f6i's mtu value.
f5bbe7ee 1684 */
b748f260 1685 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
f5bbe7ee
WW		 1686 err = -EINVAL;
1687 goto out;
1688 }
60006a48 1689
35732d01
WW		 1690 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1691 src_key);
1692 if (rt6_ex)
1693 rt6_remove_exception(bucket, rt6_ex);
1694
1695 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1696 if (!rt6_ex) {
1697 err = -ENOMEM;
1698 goto out;
1699 }
1700 rt6_ex->rt6i = nrt;
1701 rt6_ex->stamp = jiffies;
35732d01
WW		 1702 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1703 bucket->depth++;
81eb8447 1704 net->ipv6.rt6_stats->fib_rt_cache++;
35732d01
WW		 1705
1706 if (bucket->depth > FIB6_MAX_DEPTH)
1707 rt6_exception_remove_oldest(bucket);
1708
1709out:
1710 spin_unlock_bh(&rt6_exception_lock);
1711
1712 /* Update fn->fn_sernum to invalidate all cached dst */
b886d5f2 1713 if (!err) {
5012f0a5
DA		 1714 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1715 fib6_update_sernum(net, f6i);
1716 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
b886d5f2
PA		 1717 fib6_force_start_gc(net);
1718 }
35732d01
WW		 1719
1720 return err;
1721}
1722
c0b220cf 1723static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from)
35732d01
WW		 1724{
1725 struct rt6_exception_bucket *bucket;
1726 struct rt6_exception *rt6_ex;
1727 struct hlist_node *tmp;
1728 int i;
1729
1730 spin_lock_bh(&rt6_exception_lock);
35732d01 1731
cc5c073a 1732 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
35732d01
WW		 1733 if (!bucket)
1734 goto out;
1735
cc5c073a
DA		 1736 /* Prevent rt6_insert_exception() to recreate the bucket list */
1737 if (!from)
1738 fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock);
1739
35732d01 1740 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
cc5c073a
DA		 1741 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) {
1742 if (!from ||
1743 rcu_access_pointer(rt6_ex->rt6i->from) == from)
1744 rt6_remove_exception(bucket, rt6_ex);
1745 }
1746 WARN_ON_ONCE(!from && bucket->depth);
35732d01
WW		 1747 bucket++;
1748 }
35732d01
WW		 1749out:
1750 spin_unlock_bh(&rt6_exception_lock);
1751}
1752
e659ba31
DA		 1753static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
1754{
1755 struct fib6_info *f6i = arg;
1756
1757 fib6_nh_flush_exceptions(nh, f6i);
1758
1759 return 0;
1760}
1761
c0b220cf
DA		 1762void rt6_flush_exceptions(struct fib6_info *f6i)
1763{
e659ba31
DA		 1764 if (f6i->nh)
1765 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
1766 f6i);
1767 else
1768 fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
c0b220cf
DA		 1769}
1770
35732d01
WW		 1771/* Find cached rt in the hash table inside passed in rt
1772 * Caller has to hold rcu_read_lock()
1773 */
7e4b5128 1774static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
510e2ced
WW		 1775 const struct in6_addr *daddr,
1776 const struct in6_addr *saddr)
35732d01 1777{
510e2ced 1778 const struct in6_addr *src_key = NULL;
35732d01 1779 struct rt6_exception_bucket *bucket;
35732d01 1780 struct rt6_exception *rt6_ex;
7e4b5128 1781 struct rt6_info *ret = NULL;
35732d01 1782
35732d01 1783#ifdef CONFIG_IPV6_SUBTREES
7e4b5128 1784 /* fib6i_src.plen != 0 indicates f6i is in subtree
35732d01 1785 * and exception table is indexed by a hash of
7e4b5128 1786 * both fib6_dst and fib6_src.
510e2ced
WW		 1787 * However, the src addr used to create the hash
1788 * might not be exactly the passed in saddr which
1789 * is a /128 addr from the flow.
1790 * So we need to use f6i->fib6_src to redo lookup
1791 * if the passed in saddr does not find anything.
1792 * (See the logic in ip6_rt_cache_alloc() on how
1793 * rt->rt6i_src is updated.)
35732d01 1794 */
7e4b5128 1795 if (res->f6i->fib6_src.plen)
35732d01 1796 src_key = saddr;
510e2ced 1797find_ex:
35732d01 1798#endif
cc5c073a 1799 bucket = fib6_nh_get_excptn_bucket(res->nh, NULL);
35732d01
WW		 1800 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1801
1802 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
7e4b5128 1803 ret = rt6_ex->rt6i;
35732d01 1804
510e2ced
WW		 1805#ifdef CONFIG_IPV6_SUBTREES
1806 /* Use fib6_src as src_key and redo lookup */
1807 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1808 src_key = &res->f6i->fib6_src.addr;
1809 goto find_ex;
1810 }
1811#endif
1812
7e4b5128 1813 return ret;
35732d01
WW		 1814}
1815
1816/* Remove the passed in cached rt from the hash table that contains it */
cc5c073a 1817static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
c0b220cf 1818 const struct rt6_info *rt)
35732d01 1819{
c0b220cf 1820 const struct in6_addr *src_key = NULL;
35732d01 1821 struct rt6_exception_bucket *bucket;
35732d01
WW		 1822 struct rt6_exception *rt6_ex;
1823 int err;
1824
cc5c073a 1825 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
35732d01
WW		 1826 return -ENOENT;
1827
1828 spin_lock_bh(&rt6_exception_lock);
cc5c073a
DA		 1829 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1830
35732d01 1831#ifdef CONFIG_IPV6_SUBTREES
cc5c073a
DA		 1832 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1833 * and exception table is indexed by a hash of
1834 * both rt6i_dst and rt6i_src.
35732d01
WW		 1835 * Otherwise, the exception table is indexed by
1836 * a hash of only rt6i_dst.
1837 */
c0b220cf 1838 if (plen)
35732d01
WW		 1839 src_key = &rt->rt6i_src.addr;
1840#endif
1841 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1842 &rt->rt6i_dst.addr,
1843 src_key);
1844 if (rt6_ex) {
1845 rt6_remove_exception(bucket, rt6_ex);
1846 err = 0;
1847 } else {
1848 err = -ENOENT;
1849 }
1850
1851 spin_unlock_bh(&rt6_exception_lock);
1852 return err;
1853}
1854
e659ba31
DA		 1855struct fib6_nh_excptn_arg {
1856 struct rt6_info *rt;
1857 int plen;
1858};
1859
1860static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
1861{
1862 struct fib6_nh_excptn_arg *arg = _arg;
1863 int err;
1864
1865 err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
1866 if (err == 0)
1867 return 1;
1868
1869 return 0;
1870}
1871
c0b220cf
DA		 1872static int rt6_remove_exception_rt(struct rt6_info *rt)
1873{
1874 struct fib6_info *from;
1875
1876 from = rcu_dereference(rt->from);
cc5c073a 1877 if (!from || !(rt->rt6i_flags & RTF_CACHE))
c0b220cf
DA		 1878 return -EINVAL;
1879
e659ba31
DA		 1880 if (from->nh) {
1881 struct fib6_nh_excptn_arg arg = {
1882 .rt = rt,
1883 .plen = from->fib6_src.plen
1884 };
1885 int rc;
1886
1887 /* rc = 1 means an entry was found */
1888 rc = nexthop_for_each_fib6_nh(from->nh,
1889 rt6_nh_remove_exception_rt,
1890 &arg);
1891 return rc ? 0 : -ENOENT;
1892 }
1893
1cf844c7 1894 return fib6_nh_remove_exception(from->fib6_nh,
cc5c073a 1895 from->fib6_src.plen, rt);
c0b220cf
DA		 1896}
1897
35732d01
WW		 1898/* Find rt6_ex which contains the passed in rt cache and
1899 * refresh its stamp
1900 */
cc5c073a 1901static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
c0b220cf 1902 const struct rt6_info *rt)
35732d01 1903{
c0b220cf 1904 const struct in6_addr *src_key = NULL;
35732d01 1905 struct rt6_exception_bucket *bucket;
35732d01 1906 struct rt6_exception *rt6_ex;
193f3685 1907
cc5c073a 1908 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
35732d01 1909#ifdef CONFIG_IPV6_SUBTREES
cc5c073a
DA		 1910 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1911 * and exception table is indexed by a hash of
1912 * both rt6i_dst and rt6i_src.
35732d01
WW		 1913 * Otherwise, the exception table is indexed by
1914 * a hash of only rt6i_dst.
1915 */
c0b220cf 1916 if (plen)
35732d01
WW		 1917 src_key = &rt->rt6i_src.addr;
1918#endif
cc5c073a 1919 rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key);
35732d01
WW		 1920 if (rt6_ex)
1921 rt6_ex->stamp = jiffies;
c0b220cf
DA		 1922}
1923
e659ba31
DA		 1924struct fib6_nh_match_arg {
1925 const struct net_device *dev;
1926 const struct in6_addr *gw;
1927 struct fib6_nh *match;
1928};
1929
1930/* determine if fib6_nh has given device and gateway */
1931static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
1932{
1933 struct fib6_nh_match_arg *arg = _arg;
1934
1935 if (arg->dev != nh->fib_nh_dev ||
1936 (arg->gw && !nh->fib_nh_gw_family) ||
1937 (!arg->gw && nh->fib_nh_gw_family) ||
1938 (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
1939 return 0;
1940
1941 arg->match = nh;
1942
1943 /* found a match, break the loop */
1944 return 1;
1945}
1946
c0b220cf
DA		 1947static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1948{
1949 struct fib6_info *from;
e659ba31 1950 struct fib6_nh *fib6_nh;
35732d01 1951
c0b220cf
DA		 1952 rcu_read_lock();
1953
1954 from = rcu_dereference(rt->from);
1955 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1956 goto unlock;
1957
e659ba31
DA		 1958 if (from->nh) {
1959 struct fib6_nh_match_arg arg = {
1960 .dev = rt->dst.dev,
1961 .gw = &rt->rt6i_gateway,
1962 };
1963
1964 nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
1965
1966 if (!arg.match)
cff6a327 1967 goto unlock;
e659ba31
DA		 1968 fib6_nh = arg.match;
1969 } else {
1970 fib6_nh = from->fib6_nh;
1971 }
1972 fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
193f3685 1973unlock:
35732d01
WW		 1974 rcu_read_unlock();
1975}
1976
e9fa1495
SB		 1977static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1978 struct rt6_info *rt, int mtu)
1979{
1980 /* If the new MTU is lower than the route PMTU, this new MTU will be the
1981 * lowest MTU in the path: always allow updating the route PMTU to
1982 * reflect PMTU decreases.
1983 *
1984 * If the new MTU is higher, and the route PMTU is equal to the local
1985 * MTU, this means the old MTU is the lowest in the path, so allow
1986 * updating it: if other nodes now have lower MTUs, PMTU discovery will
1987 * handle this.
1988 */
1989
1990 if (dst_mtu(&rt->dst) >= mtu)
1991 return true;
1992
1993 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
1994 return true;
1995
1996 return false;
1997}
1998
1999static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
cc5c073a 2000 const struct fib6_nh *nh, int mtu)
f5bbe7ee
WW		 2001{
2002 struct rt6_exception_bucket *bucket;
2003 struct rt6_exception *rt6_ex;
2004 int i;
2005
cc5c073a 2006 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
e9fa1495
SB		 2007 if (!bucket)
2008 return;
2009
2010 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2011 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
2012 struct rt6_info *entry = rt6_ex->rt6i;
2013
2014 /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected
d4ead6b3 2015 * route), the metrics of its rt->from have already
e9fa1495
SB		 2016 * been updated.
2017 */
d4ead6b3 2018 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
e9fa1495 2019 rt6_mtu_change_route_allowed(idev, entry, mtu))
d4ead6b3 2020 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
f5bbe7ee 2021 }
e9fa1495 2022 bucket++;
f5bbe7ee
WW		 2023 }
2024}
2025
b16cb459
WW		 2026#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2027
cc5c073a
DA		 2028static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh,
2029 const struct in6_addr *gateway)
b16cb459
WW		 2030{
2031 struct rt6_exception_bucket *bucket;
2032 struct rt6_exception *rt6_ex;
2033 struct hlist_node *tmp;
2034 int i;
2035
cc5c073a 2036 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
b16cb459
WW		 2037 return;
2038
2039 spin_lock_bh(&rt6_exception_lock);
cc5c073a 2040 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
b16cb459
WW		 2041 if (bucket) {
2042 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2043 hlist_for_each_entry_safe(rt6_ex, tmp,
2044 &bucket->chain, hlist) {
2045 struct rt6_info *entry = rt6_ex->rt6i;
2046
2047 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
2048 RTF_CACHE_GATEWAY &&
2049 ipv6_addr_equal(gateway,
2050 &entry->rt6i_gateway)) {
2051 rt6_remove_exception(bucket, rt6_ex);
2052 }
2053 }
2054 bucket++;
2055 }
2056 }
2057
2058 spin_unlock_bh(&rt6_exception_lock);
2059}
2060
c757faa8
WW		 2061static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
2062 struct rt6_exception *rt6_ex,
2063 struct fib6_gc_args *gc_args,
2064 unsigned long now)
2065{
2066 struct rt6_info *rt = rt6_ex->rt6i;
2067
1859bac0
PA		 2068 /* we are pruning and obsoleting aged-out and non gateway exceptions
2069 * even if others have still references to them, so that on next
2070 * dst_check() such references can be dropped.
2071 * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when
2072 * expired, independently from their aging, as per RFC 8201 section 4
2073 */
31afeb42
WW		 2074 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
2075 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
2076 RT6_TRACE("aging clone %p\n", rt);
2077 rt6_remove_exception(bucket, rt6_ex);
2078 return;
2079 }
2080 } else if (time_after(jiffies, rt->dst.expires)) {
2081 RT6_TRACE("purging expired route %p\n", rt);
c757faa8
WW		 2082 rt6_remove_exception(bucket, rt6_ex);
2083 return;
31afeb42
WW		 2084 }
2085
2086 if (rt->rt6i_flags & RTF_GATEWAY) {
c757faa8
WW		 2087 struct neighbour *neigh;
2088 __u8 neigh_flags = 0;
2089
1bfa26ff
ED		 2090 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
2091 if (neigh)
c757faa8 2092 neigh_flags = neigh->flags;
1bfa26ff 2093
c757faa8
WW		 2094 if (!(neigh_flags & NTF_ROUTER)) {
2095 RT6_TRACE("purging route %p via non-router but gateway\n",
2096 rt);
2097 rt6_remove_exception(bucket, rt6_ex);
2098 return;
2099 }
2100 }
31afeb42 2101
c757faa8
WW		 2102 gc_args->more++;
2103}
2104
cc5c073a 2105static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
c0b220cf
DA		 2106 struct fib6_gc_args *gc_args,
2107 unsigned long now)
c757faa8
WW		 2108{
2109 struct rt6_exception_bucket *bucket;
2110 struct rt6_exception *rt6_ex;
2111 struct hlist_node *tmp;
2112 int i;
2113
cc5c073a 2114 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
c757faa8
WW		 2115 return;
2116
1bfa26ff
ED		 2117 rcu_read_lock_bh();
2118 spin_lock(&rt6_exception_lock);
cc5c073a 2119 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
c757faa8
WW		 2120 if (bucket) {
2121 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2122 hlist_for_each_entry_safe(rt6_ex, tmp,
2123 &bucket->chain, hlist) {
2124 rt6_age_examine_exception(bucket, rt6_ex,
2125 gc_args, now);
2126 }
2127 bucket++;
2128 }
2129 }
1bfa26ff
ED		 2130 spin_unlock(&rt6_exception_lock);
2131 rcu_read_unlock_bh();
c757faa8
WW		 2132}
2133
e659ba31
DA		 2134struct fib6_nh_age_excptn_arg {
2135 struct fib6_gc_args *gc_args;
2136 unsigned long now;
2137};
2138
2139static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
2140{
2141 struct fib6_nh_age_excptn_arg *arg = _arg;
2142
2143 fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
2144 return 0;
2145}
2146
cc5c073a 2147void rt6_age_exceptions(struct fib6_info *f6i,
c0b220cf
DA		 2148 struct fib6_gc_args *gc_args,
2149 unsigned long now)
2150{
e659ba31
DA		 2151 if (f6i->nh) {
2152 struct fib6_nh_age_excptn_arg arg = {
2153 .gc_args = gc_args,
2154 .now = now
2155 };
2156
2157 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
2158 &arg);
2159 } else {
2160 fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
2161 }
c0b220cf
DA		 2162}
2163
1d053da9 2164/* must be called with rcu lock held */
effda4dd
DA		 2165int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
2166 struct flowi6 *fl6, struct fib6_result *res, int strict)
1da177e4 2167{
367efcb9 2168 struct fib6_node *fn, *saved_fn;
1da177e4 2169
6454743b 2170 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 2171 saved_fn = fn;
1da177e4 2172
ca254490
DA		 2173 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2174 oif = 0;
2175
a3c00e46 2176redo_rt6_select:
effda4dd
DA		 2177 rt6_select(net, fn, oif, res, strict);
2178 if (res->f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 2179 fn = fib6_backtrack(fn, &fl6->saddr);
2180 if (fn)
2181 goto redo_rt6_select;
367efcb9
MKL		 2182 else if (strict & RT6_LOOKUP_F_REACHABLE) {
2183 /* also consider unreachable route */
2184 strict &= ~RT6_LOOKUP_F_REACHABLE;
2185 fn = saved_fn;
2186 goto redo_rt6_select;
367efcb9 2187 }
a3c00e46
MKL		 2188 }
2189
effda4dd 2190 trace_fib6_table_lookup(net, res, table, fl6);
fb9de91e 2191
effda4dd 2192 return 0;
1d053da9
DA		 2193}
2194
2195struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
2196 int oif, struct flowi6 *fl6,
2197 const struct sk_buff *skb, int flags)
2198{
b1d40991 2199 struct fib6_result res = {};
0e09edcc 2200 struct rt6_info *rt = NULL;
1d053da9
DA		 2201 int strict = 0;
2202
0e09edcc
WW		 2203 WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) &&
2204 !rcu_read_lock_held());
2205
1d053da9
DA		 2206 strict |= flags & RT6_LOOKUP_F_IFACE;
2207 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
2208 if (net->ipv6.devconf_all->forwarding == 0)
2209 strict |= RT6_LOOKUP_F_REACHABLE;
2210
2211 rcu_read_lock();
2212
effda4dd 2213 fib6_table_lookup(net, table, oif, fl6, &res, strict);
0e09edcc
WW		 2214 if (res.f6i == net->ipv6.fib6_null_entry)
2215 goto out;
23fb93a4 2216
b1d40991 2217 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
d83009d4 2218
23fb93a4 2219 /*Search through exception table */
7e4b5128 2220 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
23fb93a4 2221 if (rt) {
0e09edcc 2222 goto out;
3da59bd9 2223 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
b1d40991 2224 !res.nh->fib_nh_gw_family)) {
3da59bd9
MKL		 2225 /* Create a RTF_CACHE clone which will not be
2226 * owned by the fib6 tree. It is for the special case where
2227 * the daddr in the skb during the neighbor look-up is different
2228 * from the fl6->daddr used to look-up route here.
2229 */
0e09edcc 2230 rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
c71099ac 2231
0e09edcc
WW		 2232 if (rt) {
2233 /* 1 refcnt is taken during ip6_rt_cache_alloc().
2234 * As rt6_uncached_list_add() does not consume refcnt,
2235 * this refcnt is always returned to the caller even
2236 * if caller sets RT6_LOOKUP_F_DST_NOREF flag.
1cfb71ee 2237 */
0e09edcc 2238 rt6_uncached_list_add(rt);
81eb8447 2239 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
0e09edcc 2240 rcu_read_unlock();
b811580d 2241
0e09edcc
WW		 2242 return rt;
2243 }
d52d3997
MKL		 2244 } else {
2245 /* Get a percpu copy */
951f788a 2246 local_bh_disable();
0e09edcc 2247 rt = rt6_get_pcpu_route(&res);
d52d3997 2248
0e09edcc
WW		 2249 if (!rt)
2250 rt = rt6_make_pcpu_route(net, &res);
93531c67 2251
951f788a 2252 local_bh_enable();
d52d3997 2253 }
0e09edcc
WW		 2254out:
2255 if (!rt)
2256 rt = net->ipv6.ip6_null_entry;
2257 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
2258 ip6_hold_safe(net, &rt);
2259 rcu_read_unlock();
2260
2261 return rt;
1da177e4 2262}
9ff74384 2263EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 2264
55cced4f 2265INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net,
b75cc8f9
DA		 2266 struct fib6_table *table,
2267 struct flowi6 *fl6,
2268 const struct sk_buff *skb,
2269 int flags)
4acad72d 2270{
b75cc8f9 2271 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
4acad72d
PE		 2272}
2273
d409b847
MB		 2274struct dst_entry *ip6_route_input_lookup(struct net *net,
2275 struct net_device *dev,
b75cc8f9
DA		 2276 struct flowi6 *fl6,
2277 const struct sk_buff *skb,
2278 int flags)
72331bc0
SL		 2279{
2280 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
2281 flags |= RT6_LOOKUP_F_IFACE;
2282
b75cc8f9 2283 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
72331bc0 2284}
d409b847 2285EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
72331bc0 2286
23aebdac 2287static void ip6_multipath_l3_keys(const struct sk_buff *skb,
5e5d6fed
RP		 2288 struct flow_keys *keys,
2289 struct flow_keys *flkeys)
23aebdac
JS		 2290{
2291 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
2292 const struct ipv6hdr *key_iph = outer_iph;
5e5d6fed 2293 struct flow_keys *_flkeys = flkeys;
23aebdac
JS		 2294 const struct ipv6hdr *inner_iph;
2295 const struct icmp6hdr *icmph;
2296 struct ipv6hdr _inner_iph;
cea67a2d 2297 struct icmp6hdr _icmph;
23aebdac
JS		 2298
2299 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2300 goto out;
2301
cea67a2d
ED		 2302 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2303 sizeof(_icmph), &_icmph);
2304 if (!icmph)
2305 goto out;
2306
54074f1d 2307 if (!icmpv6_is_err(icmph->icmp6_type))
23aebdac
JS		 2308 goto out;
2309
2310 inner_iph = skb_header_pointer(skb,
2311 skb_transport_offset(skb) + sizeof(*icmph),
2312 sizeof(_inner_iph), &_inner_iph);
2313 if (!inner_iph)
2314 goto out;
2315
2316 key_iph = inner_iph;
5e5d6fed 2317 _flkeys = NULL;
23aebdac 2318out:
5e5d6fed
RP		 2319 if (_flkeys) {
2320 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2321 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2322 keys->tags.flow_label = _flkeys->tags.flow_label;
2323 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2324 } else {
2325 keys->addrs.v6addrs.src = key_iph->saddr;
2326 keys->addrs.v6addrs.dst = key_iph->daddr;
fa1be7e0 2327 keys->tags.flow_label = ip6_flowlabel(key_iph);
5e5d6fed
RP		 2328 keys->basic.ip_proto = key_iph->nexthdr;
2329 }
23aebdac
JS		 2330}
2331
2332/* if skb is set it will be used and fl6 can be NULL */
b4bac172
DA		 2333u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2334 const struct sk_buff *skb, struct flow_keys *flkeys)
23aebdac
JS		 2335{
2336 struct flow_keys hash_keys;
9a2a537a 2337 u32 mhash;
23aebdac 2338
bbfa047a 2339 switch (ip6_multipath_hash_policy(net)) {
b4bac172
DA		 2340 case 0:
2341 memset(&hash_keys, 0, sizeof(hash_keys));
2342 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2343 if (skb) {
2344 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2345 } else {
2346 hash_keys.addrs.v6addrs.src = fl6->saddr;
2347 hash_keys.addrs.v6addrs.dst = fl6->daddr;
fa1be7e0 2348 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
b4bac172
DA		 2349 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2350 }
2351 break;
2352 case 1:
2353 if (skb) {
2354 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2355 struct flow_keys keys;
2356
2357 /* short-circuit if we already have L4 hash present */
2358 if (skb->l4_hash)
2359 return skb_get_hash_raw(skb) >> 1;
2360
2361 memset(&hash_keys, 0, sizeof(hash_keys));
2362
2363 if (!flkeys) {
2364 skb_flow_dissect_flow_keys(skb, &keys, flag);
2365 flkeys = &keys;
2366 }
2367 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2368 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2369 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2370 hash_keys.ports.src = flkeys->ports.src;
2371 hash_keys.ports.dst = flkeys->ports.dst;
2372 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2373 } else {
2374 memset(&hash_keys, 0, sizeof(hash_keys));
2375 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2376 hash_keys.addrs.v6addrs.src = fl6->saddr;
2377 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2378 hash_keys.ports.src = fl6->fl6_sport;
2379 hash_keys.ports.dst = fl6->fl6_dport;
2380 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2381 }
2382 break;
d8f74f09
SS		 2383 case 2:
2384 memset(&hash_keys, 0, sizeof(hash_keys));
2385 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2386 if (skb) {
2387 struct flow_keys keys;
2388
2389 if (!flkeys) {
2390 skb_flow_dissect_flow_keys(skb, &keys, 0);
2391 flkeys = &keys;
2392 }
2393
2394 /* Inner can be v4 or v6 */
2395 if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2396 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2397 hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;
2398 hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;
2399 } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2400 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2401 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2402 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2403 hash_keys.tags.flow_label = flkeys->tags.flow_label;
2404 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2405 } else {
2406 /* Same as case 0 */
2407 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2408 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2409 }
2410 } else {
2411 /* Same as case 0 */
2412 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2413 hash_keys.addrs.v6addrs.src = fl6->saddr;
2414 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2415 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2416 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2417 }
2418 break;
23aebdac 2419 }
9a2a537a 2420 mhash = flow_hash_from_keys(&hash_keys);
23aebdac 2421
9a2a537a 2422 return mhash >> 1;
23aebdac
JS		 2423}
2424
67f415dd 2425/* Called with rcu held */
c71099ac
TG		 2426void ip6_route_input(struct sk_buff *skb)
2427{
b71d1d42 2428 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 2429 struct net *net = dev_net(skb->dev);
67f415dd 2430 int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF;
904af04d 2431 struct ip_tunnel_info *tun_info;
4c9483b2 2432 struct flowi6 fl6 = {
e0d56fdd 2433 .flowi6_iif = skb->dev->ifindex,
4c9483b2
DM		 2434 .daddr = iph->daddr,
2435 .saddr = iph->saddr,
6502ca52 2436 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 2437 .flowi6_mark = skb->mark,
2438 .flowi6_proto = iph->nexthdr,
c71099ac 2439 };
5e5d6fed 2440 struct flow_keys *flkeys = NULL, _flkeys;
adaa70bb 2441
904af04d 2442 tun_info = skb_tunnel_info(skb);
46fa062a 2443 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 2444 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
5e5d6fed
RP		 2445
2446 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2447 flkeys = &_flkeys;
2448
23aebdac 2449 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
b4bac172 2450 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
06e9d040 2451 skb_dst_drop(skb);
67f415dd
WW		 2452 skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev,
2453 &fl6, skb, flags));
c71099ac
TG		 2454}
2455
55cced4f 2456INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net,
b75cc8f9
DA		 2457 struct fib6_table *table,
2458 struct flowi6 *fl6,
2459 const struct sk_buff *skb,
2460 int flags)
1da177e4 2461{
b75cc8f9 2462 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
c71099ac
TG		 2463}
2464
7d9e5f42
WW		 2465struct dst_entry *ip6_route_output_flags_noref(struct net *net,
2466 const struct sock *sk,
2467 struct flowi6 *fl6, int flags)
c71099ac 2468{
d46a9d67 2469 bool any_src;
c71099ac 2470
3ede0bbc
RS		 2471 if (ipv6_addr_type(&fl6->daddr) &
2472 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
4c1feac5
DA		 2473 struct dst_entry *dst;
2474
7d9e5f42 2475 /* This function does not take refcnt on the dst */
4c1feac5
DA		 2476 dst = l3mdev_link_scope_lookup(net, fl6);
2477 if (dst)
2478 return dst;
2479 }
ca254490 2480
1fb9489b 2481 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 2482
7d9e5f42 2483 flags |= RT6_LOOKUP_F_DST_NOREF;
d46a9d67 2484 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 2485 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 2486 (fl6->flowi6_oif && any_src))
77d16f45 2487 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 2488
d46a9d67 2489 if (!any_src)
adaa70bb 2490 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 2491 else if (sk)
2492 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 2493
b75cc8f9 2494 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
1da177e4 2495}
7d9e5f42
WW		 2496EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref);
2497
2498struct dst_entry *ip6_route_output_flags(struct net *net,
2499 const struct sock *sk,
2500 struct flowi6 *fl6,
2501 int flags)
2502{
2503 struct dst_entry *dst;
2504 struct rt6_info *rt6;
2505
2506 rcu_read_lock();
2507 dst = ip6_route_output_flags_noref(net, sk, fl6, flags);
2508 rt6 = (struct rt6_info *)dst;
2509 /* For dst cached in uncached_list, refcnt is already taken. */
2510 if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) {
2511 dst = &net->ipv6.ip6_null_entry->dst;
2512 dst_hold(dst);
2513 }
2514 rcu_read_unlock();
2515
2516 return dst;
2517}
6f21c96a 2518EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 2519
2774c131 2520struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 2521{
5c1e6aa3 2522 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1dbe3252 2523 struct net_device *loopback_dev = net->loopback_dev;
14e50e57
DM		 2524 struct dst_entry *new = NULL;
2525
1dbe3252 2526 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
62cf27e5 2527 DST_OBSOLETE_DEAD, 0);
14e50e57 2528 if (rt) {
0a1f5962 2529 rt6_info_init(rt);
81eb8447 2530 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
8104891b 2531
0a1f5962 2532 new = &rt->dst;
14e50e57 2533 new->__use = 1;
352e512c 2534 new->input = dst_discard;
ede2059d 2535 new->output = dst_discard_out;
14e50e57 2536
0a1f5962 2537 dst_copy_metrics(new, &ort->dst);
14e50e57 2538
1dbe3252 2539 rt->rt6i_idev = in6_dev_get(loopback_dev);
4e3fd7a0 2540 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 2541 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 2542
2543 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2544#ifdef CONFIG_IPV6_SUBTREES
2545 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2546#endif
14e50e57
DM		 2547 }
2548
69ead7af
DM		 2549 dst_release(dst_orig);
2550 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 2551}
14e50e57 2552
1da177e4
LT		 2553/*
2554 * Destination cache support functions
2555 */
2556
8d1c802b 2557static bool fib6_check(struct fib6_info *f6i, u32 cookie)
4b32b5ad 2558{
93531c67
DA		 2559 u32 rt_cookie = 0;
2560
8ae86971 2561 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
93531c67
DA		 2562 return false;
2563
2564 if (fib6_check_expired(f6i))
2565 return false;
2566
2567 return true;
4b32b5ad
MKL		 2568}
2569
a68886a6
DA		 2570static struct dst_entry *rt6_check(struct rt6_info *rt,
2571 struct fib6_info *from,
2572 u32 cookie)
3da59bd9 2573{
36143645 2574 u32 rt_cookie = 0;
c5cff856 2575
49d05fe2 2576 if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
93531c67 2577 rt_cookie != cookie)
3da59bd9
MKL		 2578 return NULL;
2579
2580 if (rt6_check_expired(rt))
2581 return NULL;
2582
2583 return &rt->dst;
2584}
2585
a68886a6
DA		 2586static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2587 struct fib6_info *from,
2588 u32 cookie)
3da59bd9 2589{
5973fb1e
MKL		 2590 if (!__rt6_check_expired(rt) &&
2591 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
a68886a6 2592 fib6_check(from, cookie))
3da59bd9
MKL		 2593 return &rt->dst;
2594 else
2595 return NULL;
2596}
2597
bbd807df
BV		 2598INDIRECT_CALLABLE_SCOPE struct dst_entry *ip6_dst_check(struct dst_entry *dst,
2599 u32 cookie)
1da177e4 2600{
a87b7dc9 2601 struct dst_entry *dst_ret;
a68886a6 2602 struct fib6_info *from;
1da177e4
LT		 2603 struct rt6_info *rt;
2604
a87b7dc9
DA		 2605 rt = container_of(dst, struct rt6_info, dst);
2606
8f34e53b
DA		 2607 if (rt->sernum)
2608 return rt6_is_valid(rt) ? dst : NULL;
2609
a87b7dc9 2610 rcu_read_lock();
1da177e4 2611
6f3118b5
ND		 2612 /* All IPV6 dsts are created with ->obsolete set to the value
2613 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
2614 * into this function always.
2615 */
e3bc10bd 2616
a68886a6 2617 from = rcu_dereference(rt->from);
4b32b5ad 2618
a68886a6
DA		 2619 if (from && (rt->rt6i_flags & RTF_PCPU ||
2620 unlikely(!list_empty(&rt->rt6i_uncached))))
2621 dst_ret = rt6_dst_from_check(rt, from, cookie);
3da59bd9 2622 else
a68886a6 2623 dst_ret = rt6_check(rt, from, cookie);
a87b7dc9
DA		 2624
2625 rcu_read_unlock();
2626
2627 return dst_ret;
1da177e4 2628}
9c97921a 2629EXPORT_INDIRECT_CALLABLE(ip6_dst_check);
1da177e4
LT		 2630
2631static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2632{
2633 struct rt6_info *rt = (struct rt6_info *) dst;
2634
2635 if (rt) {
54c1a859 2636 if (rt->rt6i_flags & RTF_CACHE) {
c3c14da0 2637 rcu_read_lock();
54c1a859 2638 if (rt6_check_expired(rt)) {
93531c67 2639 rt6_remove_exception_rt(rt);
54c1a859
YH		 2640 dst = NULL;
2641 }
c3c14da0 2642 rcu_read_unlock();
54c1a859 2643 } else {
1da177e4 2644 dst_release(dst);
54c1a859
YH		 2645 dst = NULL;
2646 }
1da177e4 2647 }
54c1a859 2648 return dst;
1da177e4
LT		 2649}
2650
2651static void ip6_link_failure(struct sk_buff *skb)
2652{
2653 struct rt6_info *rt;
2654
3ffe533c 2655 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 2656
adf30907 2657 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 2658 if (rt) {
8a14e46f 2659 rcu_read_lock();
1eb4f758 2660 if (rt->rt6i_flags & RTF_CACHE) {
761f6026 2661 rt6_remove_exception_rt(rt);
c5cff856 2662 } else {
a68886a6 2663 struct fib6_info *from;
c5cff856
WW		 2664 struct fib6_node *fn;
2665
a68886a6
DA		 2666 from = rcu_dereference(rt->from);
2667 if (from) {
2668 fn = rcu_dereference(from->fib6_node);
2669 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2670 fn->fn_sernum = -1;
2671 }
1eb4f758 2672 }
8a14e46f 2673 rcu_read_unlock();
1da177e4
LT		 2674 }
2675}
2676
6a3e030f
DA		 2677static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2678{
a68886a6
DA		 2679 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2680 struct fib6_info *from;
2681
2682 rcu_read_lock();
2683 from = rcu_dereference(rt0->from);
2684 if (from)
2685 rt0->dst.expires = from->expires;
2686 rcu_read_unlock();
2687 }
6a3e030f
DA		 2688
2689 dst_set_expires(&rt0->dst, timeout);
2690 rt0->rt6i_flags |= RTF_EXPIRES;
2691}
2692
45e4fd26
MKL		 2693static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2694{
2695 struct net *net = dev_net(rt->dst.dev);
2696
d4ead6b3 2697 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
45e4fd26 2698 rt->rt6i_flags |= RTF_MODIFIED;
45e4fd26
MKL		 2699 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2700}
2701
0d3f6d29
MKL		 2702static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2703{
2704 return !(rt->rt6i_flags & RTF_CACHE) &&
1490ed2a 2705 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
0d3f6d29
MKL		 2706}
2707
45e4fd26 2708static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
bd085ef6
HL		 2709 const struct ipv6hdr *iph, u32 mtu,
2710 bool confirm_neigh)
1da177e4 2711{
0dec879f 2712 const struct in6_addr *daddr, *saddr;
67ba4152 2713 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 2714
09454fd0
MŻ		 2715 /* Note: do *NOT* check dst_metric_locked(dst, RTAX_MTU)
2716 * IPv6 pmtu discovery isn't optional, so 'mtu lock' cannot disable it.
2717 * [see also comment in rt6_mtu_change_route()]
2718 */
19bda36c 2719
0dec879f
JA		 2720 if (iph) {
2721 daddr = &iph->daddr;
2722 saddr = &iph->saddr;
2723 } else if (sk) {
2724 daddr = &sk->sk_v6_daddr;
2725 saddr = &inet6_sk(sk)->saddr;
2726 } else {
2727 daddr = NULL;
2728 saddr = NULL;
2729 }
bd085ef6
HL		 2730
2731 if (confirm_neigh)
2732 dst_confirm_neigh(dst, daddr);
2733
4a65dff8
GK		 2734 if (mtu < IPV6_MIN_MTU)
2735 return;
45e4fd26
MKL		 2736 if (mtu >= dst_mtu(dst))
2737 return;
9d289715 2738
0d3f6d29 2739 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26 2740 rt6_do_update_pmtu(rt6, mtu);
2b760fcf
WW		 2741 /* update rt6_ex->stamp for cache */
2742 if (rt6->rt6i_flags & RTF_CACHE)
2743 rt6_update_exception_stamp_rt(rt6);
0dec879f 2744 } else if (daddr) {
85bd05de 2745 struct fib6_result res = {};
45e4fd26
MKL		 2746 struct rt6_info *nrt6;
2747
4d85cd0c 2748 rcu_read_lock();
85bd05de 2749 res.f6i = rcu_dereference(rt6->from);
43a4b60d
DA		 2750 if (!res.f6i)
2751 goto out_unlock;
2752
7d21fec9
DA		 2753 res.fib6_flags = res.f6i->fib6_flags;
2754 res.fib6_type = res.f6i->fib6_type;
2755
2d44234b
DA		 2756 if (res.f6i->nh) {
2757 struct fib6_nh_match_arg arg = {
2758 .dev = dst->dev,
2759 .gw = &rt6->rt6i_gateway,
2760 };
2761
2762 nexthop_for_each_fib6_nh(res.f6i->nh,
2763 fib6_nh_find_match, &arg);
2764
2765 /* fib6_info uses a nexthop that does not have fib6_nh
2766 * using the dst->dev + gw. Should be impossible.
2767 */
43a4b60d
DA		 2768 if (!arg.match)
2769 goto out_unlock;
2d44234b
DA		 2770
2771 res.nh = arg.match;
2772 } else {
2773 res.nh = res.f6i->fib6_nh;
2774 }
2775
85bd05de 2776 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
45e4fd26
MKL		 2777 if (nrt6) {
2778 rt6_do_update_pmtu(nrt6, mtu);
5012f0a5 2779 if (rt6_insert_exception(nrt6, &res))
2b760fcf 2780 dst_release_immediate(&nrt6->dst);
45e4fd26 2781 }
43a4b60d 2782out_unlock:
a68886a6 2783 rcu_read_unlock();
1da177e4
LT		 2784 }
2785}
2786
45e4fd26 2787static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
bd085ef6
HL		 2788 struct sk_buff *skb, u32 mtu,
2789 bool confirm_neigh)
45e4fd26 2790{
bd085ef6
HL		 2791 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu,
2792 confirm_neigh);
45e4fd26
MKL		 2793}
2794
42ae66c8 2795void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
e2d118a1 2796 int oif, u32 mark, kuid_t uid)
81aded24
DM		 2797{
2798 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2799 struct dst_entry *dst;
dc92095d
MŻ		 2800 struct flowi6 fl6 = {
2801 .flowi6_oif = oif,
2802 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2803 .daddr = iph->daddr,
2804 .saddr = iph->saddr,
2805 .flowlabel = ip6_flowinfo(iph),
2806 .flowi6_uid = uid,
2807 };
81aded24
DM		 2808
2809 dst = ip6_route_output(net, NULL, &fl6);
2810 if (!dst->error)
bd085ef6 2811 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true);
81aded24
DM		 2812 dst_release(dst);
2813}
2814EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2815
2816void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2817{
7ddacfa5 2818 int oif = sk->sk_bound_dev_if;
33c162a9
MKL		 2819 struct dst_entry *dst;
2820
7ddacfa5
DA		 2821 if (!oif && skb->dev)
2822 oif = l3mdev_master_ifindex(skb->dev);
2823
2824 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
33c162a9
MKL		 2825
2826 dst = __sk_dst_get(sk);
2827 if (!dst || !dst->obsolete ||
2828 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2829 return;
2830
2831 bh_lock_sock(sk);
2832 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2833 ip6_datagram_dst_update(sk, false);
2834 bh_unlock_sock(sk);
81aded24
DM		 2835}
2836EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2837
7d6850f7
AK		 2838void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2839 const struct flowi6 *fl6)
2840{
2841#ifdef CONFIG_IPV6_SUBTREES
2842 struct ipv6_pinfo *np = inet6_sk(sk);
2843#endif
2844
2845 ip6_dst_store(sk, dst,
2846 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2847 &sk->sk_v6_daddr : NULL,
2848#ifdef CONFIG_IPV6_SUBTREES
2849 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2850 &np->saddr :
2851#endif
2852 NULL);
2853}
2854
9b6b35ab 2855static bool ip6_redirect_nh_match(const struct fib6_result *res,
0b34eb00
DA		 2856 struct flowi6 *fl6,
2857 const struct in6_addr *gw,
2858 struct rt6_info **ret)
2859{
9b6b35ab
DA		 2860 const struct fib6_nh *nh = res->nh;
2861
0b34eb00
DA		 2862 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2863 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2864 return false;
2865
2866 /* rt_cache's gateway might be different from its 'parent'
2867 * in the case of an ip redirect.
2868 * So we keep searching in the exception table if the gateway
2869 * is different.
2870 */
2871 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
2872 struct rt6_info *rt_cache;
2873
9b6b35ab 2874 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
0b34eb00
DA		 2875 if (rt_cache &&
2876 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
2877 *ret = rt_cache;
2878 return true;
2879 }
2880 return false;
2881 }
2882 return true;
2883}
2884
c55c8988
DA		 2885struct fib6_nh_rd_arg {
2886 struct fib6_result *res;
2887 struct flowi6 *fl6;
2888 const struct in6_addr *gw;
2889 struct rt6_info **ret;
2890};
2891
2892static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg)
2893{
2894 struct fib6_nh_rd_arg *arg = _arg;
2895
2896 arg->res->nh = nh;
2897 return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret);
2898}
2899
b55b76b2
DJ		 2900/* Handle redirects */
2901struct ip6rd_flowi {
2902 struct flowi6 fl6;
2903 struct in6_addr gateway;
2904};
2905
55cced4f 2906INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net,
b55b76b2
DJ		 2907 struct fib6_table *table,
2908 struct flowi6 *fl6,
b75cc8f9 2909 const struct sk_buff *skb,
b55b76b2
DJ		 2910 int flags)
2911{
2912 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
0b34eb00 2913 struct rt6_info *ret = NULL;
9b6b35ab 2914 struct fib6_result res = {};
c55c8988
DA		 2915 struct fib6_nh_rd_arg arg = {
2916 .res = &res,
2917 .fl6 = fl6,
2918 .gw = &rdfl->gateway,
2919 .ret = &ret
2920 };
8d1c802b 2921 struct fib6_info *rt;
b55b76b2
DJ		 2922 struct fib6_node *fn;
2923
31680ac2
DA		 2924 /* l3mdev_update_flow overrides oif if the device is enslaved; in
2925 * this case we must match on the real ingress device, so reset it
2926 */
2927 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2928 fl6->flowi6_oif = skb->dev->ifindex;
2929
b55b76b2 2930 /* Get the "current" route for this destination and
67c408cf 2931 * check if the redirect has come from appropriate router.
b55b76b2
DJ		 2932 *
2933 * RFC 4861 specifies that redirects should only be
2934 * accepted if they come from the nexthop to the target.
2935 * Due to the way the routes are chosen, this notion
2936 * is a bit fuzzy and one might need to check all possible
2937 * routes.
2938 */
2939
66f5d6ce 2940 rcu_read_lock();
6454743b 2941 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
b55b76b2 2942restart:
66f5d6ce 2943 for_each_fib6_node_rt_rcu(fn) {
9b6b35ab 2944 res.f6i = rt;
14895687 2945 if (fib6_check_expired(rt))
b55b76b2 2946 continue;
93c2fb25 2947 if (rt->fib6_flags & RTF_REJECT)
b55b76b2 2948 break;
c55c8988
DA		 2949 if (unlikely(rt->nh)) {
2950 if (nexthop_is_blackhole(rt->nh))
2951 continue;
2952 /* on match, res->nh is filled in and potentially ret */
2953 if (nexthop_for_each_fib6_nh(rt->nh,
2954 fib6_nh_redirect_match,
2955 &arg))
2956 goto out;
2957 } else {
2958 res.nh = rt->fib6_nh;
2959 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway,
2960 &ret))
2961 goto out;
2962 }
b55b76b2
DJ		 2963 }
2964
2965 if (!rt)
421842ed 2966 rt = net->ipv6.fib6_null_entry;
93c2fb25 2967 else if (rt->fib6_flags & RTF_REJECT) {
23fb93a4 2968 ret = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 2969 goto out;
2970 }
2971
421842ed 2972 if (rt == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 2973 fn = fib6_backtrack(fn, &fl6->saddr);
2974 if (fn)
2975 goto restart;
b55b76b2 2976 }
a3c00e46 2977
9b6b35ab 2978 res.f6i = rt;
1cf844c7 2979 res.nh = rt->fib6_nh;
b0a1ba59 2980out:
7d21fec9 2981 if (ret) {
10585b43 2982 ip6_hold_safe(net, &ret);
7d21fec9
DA		 2983 } else {
2984 res.fib6_flags = res.f6i->fib6_flags;
2985 res.fib6_type = res.f6i->fib6_type;
9b6b35ab 2986 ret = ip6_create_rt_rcu(&res);
7d21fec9 2987 }
b55b76b2 2988
66f5d6ce 2989 rcu_read_unlock();
b55b76b2 2990
8ff2e5b2 2991 trace_fib6_table_lookup(net, &res, table, fl6);
23fb93a4 2992 return ret;
b55b76b2
DJ		 2993};
2994
2995static struct dst_entry *ip6_route_redirect(struct net *net,
b75cc8f9
DA		 2996 const struct flowi6 *fl6,
2997 const struct sk_buff *skb,
2998 const struct in6_addr *gateway)
b55b76b2
DJ		 2999{
3000 int flags = RT6_LOOKUP_F_HAS_SADDR;
3001 struct ip6rd_flowi rdfl;
3002
3003 rdfl.fl6 = *fl6;
3004 rdfl.gateway = *gateway;
3005
b75cc8f9 3006 return fib6_rule_lookup(net, &rdfl.fl6, skb,
b55b76b2
DJ		 3007 flags, __ip6_route_redirect);
3008}
3009
e2d118a1
LC		 3010void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
3011 kuid_t uid)
3a5ad2ee
DM		 3012{
3013 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
3014 struct dst_entry *dst;
1f7f10ac
MŻ		 3015 struct flowi6 fl6 = {
3016 .flowi6_iif = LOOPBACK_IFINDEX,
3017 .flowi6_oif = oif,
3018 .flowi6_mark = mark,
3019 .daddr = iph->daddr,
3020 .saddr = iph->saddr,
3021 .flowlabel = ip6_flowinfo(iph),
3022 .flowi6_uid = uid,
3023 };
3a5ad2ee 3024
b75cc8f9 3025 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
b55b76b2 3026 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 3027 dst_release(dst);
3028}
3029EXPORT_SYMBOL_GPL(ip6_redirect);
3030
d456336d 3031void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
c92a59ec
DJ		 3032{
3033 const struct ipv6hdr *iph = ipv6_hdr(skb);
3034 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
3035 struct dst_entry *dst;
0b26fb17
MŻ		 3036 struct flowi6 fl6 = {
3037 .flowi6_iif = LOOPBACK_IFINDEX,
3038 .flowi6_oif = oif,
0b26fb17
MŻ		 3039 .daddr = msg->dest,
3040 .saddr = iph->daddr,
3041 .flowi6_uid = sock_net_uid(net, NULL),
3042 };
c92a59ec 3043
b75cc8f9 3044 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
b55b76b2 3045 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 3046 dst_release(dst);
3047}
3048
3a5ad2ee
DM		 3049void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
3050{
e2d118a1
LC		 3051 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
3052 sk->sk_uid);
3a5ad2ee
DM		 3053}
3054EXPORT_SYMBOL_GPL(ip6_sk_redirect);
3055
0dbaee3b 3056static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 3057{
0dbaee3b
DM		 3058 struct net_device *dev = dst->dev;
3059 unsigned int mtu = dst_mtu(dst);
3060 struct net *net = dev_net(dev);
3061
1da177e4
LT		 3062 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
3063
5578689a
DL		 3064 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
3065 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 3066
3067 /*
1ab1457c
YH		 3068 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
3069 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
3070 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 3071 * rely only on pmtu discovery"
3072 */
3073 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
3074 mtu = IPV6_MAXPLEN;
3075 return mtu;
3076}
3077
f67fbeae 3078INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 3079{
d33e4553 3080 struct inet6_dev *idev;
d4ead6b3 3081 unsigned int mtu;
4b32b5ad
MKL		 3082
3083 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 3084 if (mtu)
30f78d8e 3085 goto out;
618f9bc7
SK		 3086
3087 mtu = IPV6_MIN_MTU;
d33e4553
DM		 3088
3089 rcu_read_lock();
3090 idev = __in6_dev_get(dst->dev);
3091 if (idev)
3092 mtu = idev->cnf.mtu6;
3093 rcu_read_unlock();
3094
30f78d8e 3095out:
14972cbd
RP		 3096 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3097
3098 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
d33e4553 3099}
9c97921a 3100EXPORT_INDIRECT_CALLABLE(ip6_mtu);
d33e4553 3101
901731b8
DA		 3102/* MTU selection:
3103 * 1. mtu on route is locked - use it
3104 * 2. mtu from nexthop exception
3105 * 3. mtu from egress device
3106 *
3107 * based on ip6_dst_mtu_forward and exception logic of
3108 * rt6_find_cached_rt; called with rcu_read_lock
3109 */
b748f260
DA		 3110u32 ip6_mtu_from_fib6(const struct fib6_result *res,
3111 const struct in6_addr *daddr,
3112 const struct in6_addr *saddr)
901731b8 3113{
b748f260
DA		 3114 const struct fib6_nh *nh = res->nh;
3115 struct fib6_info *f6i = res->f6i;
901731b8 3116 struct inet6_dev *idev;
510e2ced 3117 struct rt6_info *rt;
901731b8
DA		 3118 u32 mtu = 0;
3119
3120 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
3121 mtu = f6i->fib6_pmtu;
3122 if (mtu)
3123 goto out;
3124 }
3125
510e2ced
WW		 3126 rt = rt6_find_cached_rt(res, daddr, saddr);
3127 if (unlikely(rt)) {
3128 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
3129 } else {
b748f260 3130 struct net_device *dev = nh->fib_nh_dev;
901731b8
DA		 3131
3132 mtu = IPV6_MIN_MTU;
3133 idev = __in6_dev_get(dev);
3134 if (idev && idev->cnf.mtu6 > mtu)
3135 mtu = idev->cnf.mtu6;
3136 }
3137
3138 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3139out:
b748f260 3140 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
901731b8
DA		 3141}
3142
3b00944c 3143struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 3144 struct flowi6 *fl6)
1da177e4 3145{
87a11578 3146 struct dst_entry *dst;
1da177e4
LT		 3147 struct rt6_info *rt;
3148 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 3149 struct net *net = dev_net(dev);
1da177e4 3150
38308473 3151 if (unlikely(!idev))
122bdf67 3152 return ERR_PTR(-ENODEV);
1da177e4 3153
ad706862 3154 rt = ip6_dst_alloc(net, dev, 0);
38308473 3155 if (unlikely(!rt)) {
1da177e4 3156 in6_dev_put(idev);
87a11578 3157 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 3158 goto out;
3159 }
3160
588753f1 3161 rt->dst.input = ip6_input;
8e2ec639 3162 rt->dst.output = ip6_output;
550bab42 3163 rt->rt6i_gateway = fl6->daddr;
87a11578 3164 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 3165 rt->rt6i_dst.plen = 128;
3166 rt->rt6i_idev = idev;
14edd87d 3167 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 3168
4c981e28 3169 /* Add this dst into uncached_list so that rt6_disable_ip() can
587fea74
WW		 3170 * do proper release of the net_device
3171 */
3172 rt6_uncached_list_add(rt);
81eb8447 3173 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
1da177e4 3174
87a11578
DM		 3175 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
3176
1da177e4 3177out:
87a11578 3178 return dst;
1da177e4
LT		 3179}
3180
569d3645 3181static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 3182{
86393e52 3183 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 3184 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
3185 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
3186 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
3187 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
3188 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 3189 int entries;
7019b78e 3190
fc66f95c 3191 entries = dst_entries_get_fast(ops);
cf86a086
ED		 3192 if (entries > rt_max_size)
3193 entries = dst_entries_get_slow(ops);
3194
49a18d86 3195 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 3196 entries <= rt_max_size)
1da177e4
LT		 3197 goto out;
3198
6891a346 3199 net->ipv6.ip6_rt_gc_expire++;
14956643 3200 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 3201 entries = dst_entries_get_slow(ops);
3202 if (entries < ops->gc_thresh)
7019b78e 3203 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 3204out:
7019b78e 3205 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 3206 return entries > rt_max_size;
1da177e4
LT		 3207}
3208
b2c709cc
DA		 3209static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
3210 const struct in6_addr *gw_addr, u32 tbid,
3211 int flags, struct fib6_result *res)
8c14586f
DA		 3212{
3213 struct flowi6 fl6 = {
3214 .flowi6_oif = cfg->fc_ifindex,
3215 .daddr = *gw_addr,
3216 .saddr = cfg->fc_prefsrc,
3217 };
3218 struct fib6_table *table;
b2c709cc 3219 int err;
8c14586f 3220
f4797b33 3221 table = fib6_get_table(net, tbid);
8c14586f 3222 if (!table)
b2c709cc 3223 return -EINVAL;
8c14586f
DA		 3224
3225 if (!ipv6_addr_any(&cfg->fc_prefsrc))
3226 flags |= RT6_LOOKUP_F_HAS_SADDR;
3227
f4797b33 3228 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
8c14586f 3229
b2c709cc
DA		 3230 err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags);
3231 if (!err && res->f6i != net->ipv6.fib6_null_entry)
3232 fib6_select_path(net, res, &fl6, cfg->fc_ifindex,
3233 cfg->fc_ifindex != 0, NULL, flags);
8c14586f 3234
b2c709cc 3235 return err;
8c14586f
DA		 3236}
3237
fc1e64e1
DA		 3238static int ip6_route_check_nh_onlink(struct net *net,
3239 struct fib6_config *cfg,
9fbb704c 3240 const struct net_device *dev,
fc1e64e1
DA		 3241 struct netlink_ext_ack *extack)
3242{
b2c709cc 3243 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
fc1e64e1 3244 const struct in6_addr *gw_addr = &cfg->fc_gateway;
b2c709cc 3245 struct fib6_result res = {};
fc1e64e1
DA		 3246 int err;
3247
b2c709cc
DA		 3248 err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res);
3249 if (!err && !(res.fib6_flags & RTF_REJECT) &&
3250 /* ignore match if it is the default route */
3251 !ipv6_addr_any(&res.f6i->fib6_dst.addr) &&
3252 (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) {
3253 NL_SET_ERR_MSG(extack,
3254 "Nexthop has invalid gateway or device mismatch");
3255 err = -EINVAL;
fc1e64e1
DA		 3256 }
3257
3258 return err;
3259}
3260
1edce99f
DA		 3261static int ip6_route_check_nh(struct net *net,
3262 struct fib6_config *cfg,
3263 struct net_device **_dev,
3264 struct inet6_dev **idev)
3265{
3266 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3267 struct net_device *dev = _dev ? *_dev : NULL;
b2c709cc
DA		 3268 int flags = RT6_LOOKUP_F_IFACE;
3269 struct fib6_result res = {};
1edce99f
DA		 3270 int err = -EHOSTUNREACH;
3271
3272 if (cfg->fc_table) {
b2c709cc
DA		 3273 err = ip6_nh_lookup_table(net, cfg, gw_addr,
3274 cfg->fc_table, flags, &res);
3275 /* gw_addr can not require a gateway or resolve to a reject
3276 * route. If a device is given, it must match the result.
3277 */
3278 if (err || res.fib6_flags & RTF_REJECT ||
3279 res.nh->fib_nh_gw_family ||
3280 (dev && dev != res.nh->fib_nh_dev))
3281 err = -EHOSTUNREACH;
1edce99f
DA		 3282 }
3283
b2c709cc
DA		 3284 if (err < 0) {
3285 struct flowi6 fl6 = {
3286 .flowi6_oif = cfg->fc_ifindex,
3287 .daddr = *gw_addr,
3288 };
1edce99f 3289
b2c709cc
DA		 3290 err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags);
3291 if (err || res.fib6_flags & RTF_REJECT ||
3292 res.nh->fib_nh_gw_family)
3293 err = -EHOSTUNREACH;
3294
3295 if (err)
3296 return err;
3297
3298 fib6_select_path(net, &res, &fl6, cfg->fc_ifindex,
3299 cfg->fc_ifindex != 0, NULL, flags);
3300 }
1edce99f 3301
b2c709cc 3302 err = 0;
1edce99f 3303 if (dev) {
b2c709cc
DA		 3304 if (dev != res.nh->fib_nh_dev)
3305 err = -EHOSTUNREACH;
1edce99f 3306 } else {
b2c709cc 3307 *_dev = dev = res.nh->fib_nh_dev;
1edce99f 3308 dev_hold(dev);
b2c709cc 3309 *idev = in6_dev_get(dev);
1edce99f
DA		 3310 }
3311
1edce99f
DA		 3312 return err;
3313}
3314
9fbb704c
DA		 3315static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
3316 struct net_device **_dev, struct inet6_dev **idev,
3317 struct netlink_ext_ack *extack)
3318{
3319 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3320 int gwa_type = ipv6_addr_type(gw_addr);
232378e8 3321 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
9fbb704c 3322 const struct net_device *dev = *_dev;
232378e8 3323 bool need_addr_check = !dev;
9fbb704c
DA		 3324 int err = -EINVAL;
3325
3326 /* if gw_addr is local we will fail to detect this in case
3327 * address is still TENTATIVE (DAD in progress). rt6_lookup()
3328 * will return already-added prefix route via interface that
3329 * prefix route was assigned to, which might be non-loopback.
3330 */
232378e8
DA		 3331 if (dev &&
3332 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3333 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
9fbb704c
DA		 3334 goto out;
3335 }
3336
3337 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
3338 /* IPv6 strictly inhibits using not link-local
3339 * addresses as nexthop address.
3340 * Otherwise, router will not able to send redirects.
3341 * It is very good, but in some (rare!) circumstances
3342 * (SIT, PtP, NBMA NOARP links) it is handy to allow
3343 * some exceptions. --ANK
3344 * We allow IPv4-mapped nexthops to support RFC4798-type
3345 * addressing
3346 */
3347 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
3348 NL_SET_ERR_MSG(extack, "Invalid gateway address");
3349 goto out;
3350 }
3351
b2c709cc
DA		 3352 rcu_read_lock();
3353
9fbb704c
DA		 3354 if (cfg->fc_flags & RTNH_F_ONLINK)
3355 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
3356 else
3357 err = ip6_route_check_nh(net, cfg, _dev, idev);
3358
b2c709cc
DA		 3359 rcu_read_unlock();
3360
9fbb704c
DA		 3361 if (err)
3362 goto out;
3363 }
3364
3365 /* reload in case device was changed */
3366 dev = *_dev;
3367
3368 err = -EINVAL;
3369 if (!dev) {
3370 NL_SET_ERR_MSG(extack, "Egress device not specified");
3371 goto out;
3372 } else if (dev->flags & IFF_LOOPBACK) {
3373 NL_SET_ERR_MSG(extack,
3374 "Egress device can not be loopback device for this route");
3375 goto out;
3376 }
232378e8
DA		 3377
3378 /* if we did not check gw_addr above, do so now that the
3379 * egress device has been resolved.
3380 */
3381 if (need_addr_check &&
3382 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3383 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3384 goto out;
3385 }
3386
9fbb704c
DA		 3387 err = 0;
3388out:
3389 return err;
3390}
3391
83c44251
DA		 3392static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
3393{
3394 if ((flags & RTF_REJECT) ||
3395 (dev && (dev->flags & IFF_LOOPBACK) &&
3396 !(addr_type & IPV6_ADDR_LOOPBACK) &&
aea23c32 3397 !(flags & (RTF_ANYCAST | RTF_LOCAL))))
83c44251
DA		 3398 return true;
3399
3400 return false;
3401}
3402
3403int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
3404 struct fib6_config *cfg, gfp_t gfp_flags,
3405 struct netlink_ext_ack *extack)
3406{
3407 struct net_device *dev = NULL;
3408 struct inet6_dev *idev = NULL;
3409 int addr_type;
3410 int err;
3411
f1741730 3412 fib6_nh->fib_nh_family = AF_INET6;
1bef4c22
ED		 3413#ifdef CONFIG_IPV6_ROUTER_PREF
3414 fib6_nh->last_probe = jiffies;
3415#endif
38428d68
RP		 3416 if (cfg->fc_is_fdb) {
3417 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3418 fib6_nh->fib_nh_gw_family = AF_INET6;
3419 return 0;
3420 }
f1741730 3421
83c44251
DA		 3422 err = -ENODEV;
3423 if (cfg->fc_ifindex) {
3424 dev = dev_get_by_index(net, cfg->fc_ifindex);
3425 if (!dev)
3426 goto out;
3427 idev = in6_dev_get(dev);
3428 if (!idev)
3429 goto out;
3430 }
3431
3432 if (cfg->fc_flags & RTNH_F_ONLINK) {
3433 if (!dev) {
3434 NL_SET_ERR_MSG(extack,
3435 "Nexthop device required for onlink");
3436 goto out;
3437 }
3438
3439 if (!(dev->flags & IFF_UP)) {
3440 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3441 err = -ENETDOWN;
3442 goto out;
3443 }
3444
ad1601ae 3445 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
83c44251
DA		 3446 }
3447
ad1601ae 3448 fib6_nh->fib_nh_weight = 1;
83c44251
DA		 3449
3450 /* We cannot add true routes via loopback here,
3451 * they would result in kernel looping; promote them to reject routes
3452 */
3453 addr_type = ipv6_addr_type(&cfg->fc_dst);
3454 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3455 /* hold loopback dev/idev if we haven't done so. */
3456 if (dev != net->loopback_dev) {
3457 if (dev) {
3458 dev_put(dev);
3459 in6_dev_put(idev);
3460 }
3461 dev = net->loopback_dev;
3462 dev_hold(dev);
3463 idev = in6_dev_get(dev);
3464 if (!idev) {
3465 err = -ENODEV;
3466 goto out;
3467 }
3468 }
7dd73168 3469 goto pcpu_alloc;
83c44251
DA		 3470 }
3471
3472 if (cfg->fc_flags & RTF_GATEWAY) {
3473 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3474 if (err)
3475 goto out;
3476
ad1601ae 3477 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
bdf00467 3478 fib6_nh->fib_nh_gw_family = AF_INET6;
83c44251
DA		 3479 }
3480
3481 err = -ENODEV;
3482 if (!dev)
3483 goto out;
3484
3485 if (idev->cnf.disable_ipv6) {
3486 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3487 err = -EACCES;
3488 goto out;
3489 }
3490
3491 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3492 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3493 err = -ENETDOWN;
3494 goto out;
3495 }
3496
3497 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3498 !netif_carrier_ok(dev))
ad1601ae 3499 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
83c44251 3500
faee6769 3501 err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap,
7dd73168
DA		 3502 cfg->fc_encap_type, cfg, gfp_flags, extack);
3503 if (err)
3504 goto out;
3505
3506pcpu_alloc:
f40b6ae2
DA		 3507 fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
3508 if (!fib6_nh->rt6i_pcpu) {
3509 err = -ENOMEM;
3510 goto out;
3511 }
3512
ad1601ae 3513 fib6_nh->fib_nh_dev = dev;
f1741730 3514 fib6_nh->fib_nh_oif = dev->ifindex;
83c44251
DA		 3515 err = 0;
3516out:
3517 if (idev)
3518 in6_dev_put(idev);
3519
3520 if (err) {
ad1601ae
DA		 3521 lwtstate_put(fib6_nh->fib_nh_lws);
3522 fib6_nh->fib_nh_lws = NULL;
83c44251
DA		 3523 if (dev)
3524 dev_put(dev);
3525 }
3526
3527 return err;
3528}
3529
dac7d0f2
DA		 3530void fib6_nh_release(struct fib6_nh *fib6_nh)
3531{
cc5c073a
DA		 3532 struct rt6_exception_bucket *bucket;
3533
3534 rcu_read_lock();
3535
3536 fib6_nh_flush_exceptions(fib6_nh, NULL);
3537 bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL);
3538 if (bucket) {
3539 rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL);
3540 kfree(bucket);
3541 }
3542
3543 rcu_read_unlock();
3544
f40b6ae2
DA		 3545 if (fib6_nh->rt6i_pcpu) {
3546 int cpu;
3547
3548 for_each_possible_cpu(cpu) {
3549 struct rt6_info **ppcpu_rt;
3550 struct rt6_info *pcpu_rt;
3551
3552 ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
3553 pcpu_rt = *ppcpu_rt;
3554 if (pcpu_rt) {
3555 dst_dev_put(&pcpu_rt->dst);
3556 dst_release(&pcpu_rt->dst);
3557 *ppcpu_rt = NULL;
3558 }
3559 }
3560
3561 free_percpu(fib6_nh->rt6i_pcpu);
3562 }
3563
979e276e 3564 fib_nh_common_release(&fib6_nh->nh_common);
dac7d0f2
DA		 3565}
3566
8d1c802b 3567static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
acb54e3c 3568 gfp_t gfp_flags,
333c4301 3569 struct netlink_ext_ack *extack)
1da177e4 3570{
5578689a 3571 struct net *net = cfg->fc_nlinfo.nl_net;
8d1c802b 3572 struct fib6_info *rt = NULL;
f88d8ea6 3573 struct nexthop *nh = NULL;
c71099ac 3574 struct fib6_table *table;
f88d8ea6 3575 struct fib6_nh *fib6_nh;
8c5b83f0 3576 int err = -EINVAL;
83c44251 3577 int addr_type;
1da177e4 3578
557c44be 3579 /* RTF_PCPU is an internal flag; can not be set by userspace */
d5d531cb
DA		 3580 if (cfg->fc_flags & RTF_PCPU) {
3581 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
557c44be 3582 goto out;
d5d531cb 3583 }
557c44be 3584
2ea2352e
WW		 3585 /* RTF_CACHE is an internal flag; can not be set by userspace */
3586 if (cfg->fc_flags & RTF_CACHE) {
3587 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3588 goto out;
3589 }
3590
e8478e80
DA		 3591 if (cfg->fc_type > RTN_MAX) {
3592 NL_SET_ERR_MSG(extack, "Invalid route type");
3593 goto out;
3594 }
3595
d5d531cb
DA		 3596 if (cfg->fc_dst_len > 128) {
3597 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3598 goto out;
3599 }
3600 if (cfg->fc_src_len > 128) {
3601 NL_SET_ERR_MSG(extack, "Invalid source address length");
8c5b83f0 3602 goto out;
d5d531cb 3603 }
1da177e4 3604#ifndef CONFIG_IPV6_SUBTREES
d5d531cb
DA		 3605 if (cfg->fc_src_len) {
3606 NL_SET_ERR_MSG(extack,
3607 "Specifying source address requires IPV6_SUBTREES to be enabled");
8c5b83f0 3608 goto out;
d5d531cb 3609 }
1da177e4 3610#endif
5b98324e
DA		 3611 if (cfg->fc_nh_id) {
3612 nh = nexthop_find_by_id(net, cfg->fc_nh_id);
3613 if (!nh) {
3614 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
3615 goto out;
3616 }
3617 err = fib6_check_nexthop(nh, cfg, extack);
3618 if (err)
3619 goto out;
3620 }
fc1e64e1 3621
d71314b4 3622 err = -ENOBUFS;
38308473
DM		 3623 if (cfg->fc_nlinfo.nlh &&
3624 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 3625 table = fib6_get_table(net, cfg->fc_table);
38308473 3626 if (!table) {
f3213831 3627 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 3628 table = fib6_new_table(net, cfg->fc_table);
3629 }
3630 } else {
3631 table = fib6_new_table(net, cfg->fc_table);
3632 }
38308473
DM		 3633
3634 if (!table)
c71099ac 3635 goto out;
c71099ac 3636
93531c67 3637 err = -ENOMEM;
f88d8ea6 3638 rt = fib6_info_alloc(gfp_flags, !nh);
93531c67 3639 if (!rt)
1da177e4 3640 goto out;
93531c67 3641
d7e774f3
DA		 3642 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3643 extack);
767a2217
DA		 3644 if (IS_ERR(rt->fib6_metrics)) {
3645 err = PTR_ERR(rt->fib6_metrics);
fda21d46
ED		 3646 /* Do not leave garbage there. */
3647 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
767a2217
DA		 3648 goto out;
3649 }
3650
93531c67
DA		 3651 if (cfg->fc_flags & RTF_ADDRCONF)
3652 rt->dst_nocount = true;
1da177e4 3653
1716a961 3654 if (cfg->fc_flags & RTF_EXPIRES)
14895687 3655 fib6_set_expires(rt, jiffies +
1716a961
G		 3656 clock_t_to_jiffies(cfg->fc_expires));
3657 else
14895687 3658 fib6_clean_expires(rt);
1da177e4 3659
86872cb5
TG		 3660 if (cfg->fc_protocol == RTPROT_UNSPEC)
3661 cfg->fc_protocol = RTPROT_BOOT;
93c2fb25 3662 rt->fib6_protocol = cfg->fc_protocol;
86872cb5 3663
83c44251
DA		 3664 rt->fib6_table = table;
3665 rt->fib6_metric = cfg->fc_metric;
c7036d97 3666 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
2b2450ca 3667 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
19e42e45 3668
93c2fb25
DA		 3669 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3670 rt->fib6_dst.plen = cfg->fc_dst_len;
e5fd387a 3671
1da177e4 3672#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 3673 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3674 rt->fib6_src.plen = cfg->fc_src_len;
1da177e4 3675#endif
f88d8ea6 3676 if (nh) {
f88d8ea6 3677 if (rt->fib6_src.plen) {
4daa95af 3678 NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing");
f88d8ea6
DA		 3679 goto out;
3680 }
706ec919
XY		 3681 if (!nexthop_get(nh)) {
3682 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
3683 goto out;
3684 }
f88d8ea6
DA		 3685 rt->nh = nh;
3686 fib6_nh = nexthop_fib6_nh(rt->nh);
3687 } else {
3688 err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack);
3689 if (err)
3690 goto out;
1da177e4 3691
f88d8ea6
DA		 3692 fib6_nh = rt->fib6_nh;
3693
3694 /* We cannot add true routes via loopback here, they would
3695 * result in kernel looping; promote them to reject routes
3696 */
3697 addr_type = ipv6_addr_type(&cfg->fc_dst);
3698 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev,
3699 addr_type))
3700 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3701 }
955ec4cb 3702
c3968a85 3703 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
f88d8ea6 3704 struct net_device *dev = fib6_nh->fib_nh_dev;
83c44251 3705
c3968a85 3706 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
d5d531cb 3707 NL_SET_ERR_MSG(extack, "Invalid source address");
c3968a85
DW		 3708 err = -EINVAL;
3709 goto out;
3710 }
93c2fb25
DA		 3711 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3712 rt->fib6_prefsrc.plen = 128;
c3968a85 3713 } else
93c2fb25 3714 rt->fib6_prefsrc.plen = 0;
c3968a85 3715
8c5b83f0 3716 return rt;
6b9ea5a6 3717out:
93531c67 3718 fib6_info_release(rt);
8c5b83f0 3719 return ERR_PTR(err);
6b9ea5a6
RP		 3720}
3721
acb54e3c 3722int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
333c4301 3723 struct netlink_ext_ack *extack)
6b9ea5a6 3724{
8d1c802b 3725 struct fib6_info *rt;
6b9ea5a6
RP		 3726 int err;
3727
acb54e3c 3728 rt = ip6_route_info_create(cfg, gfp_flags, extack);
d4ead6b3
DA		 3729 if (IS_ERR(rt))
3730 return PTR_ERR(rt);
6b9ea5a6 3731
d4ead6b3 3732 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
93531c67 3733 fib6_info_release(rt);
6b9ea5a6 3734
1da177e4
LT		 3735 return err;
3736}
3737
8d1c802b 3738static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
1da177e4 3739{
afb1d4b5 3740 struct net *net = info->nl_net;
c71099ac 3741 struct fib6_table *table;
afb1d4b5 3742 int err;
1da177e4 3743
421842ed 3744 if (rt == net->ipv6.fib6_null_entry) {
6825a26c
G		 3745 err = -ENOENT;
3746 goto out;
3747 }
6c813a72 3748
93c2fb25 3749 table = rt->fib6_table;
66f5d6ce 3750 spin_lock_bh(&table->tb6_lock);
86872cb5 3751 err = fib6_del(rt, info);
66f5d6ce 3752 spin_unlock_bh(&table->tb6_lock);
1da177e4 3753
6825a26c 3754out:
93531c67 3755 fib6_info_release(rt);
1da177e4
LT		 3756 return err;
3757}
3758
11dd74b3 3759int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
e0a1ad73 3760{
11dd74b3
RP		 3761 struct nl_info info = {
3762 .nl_net = net,
3763 .skip_notify = skip_notify
3764 };
afb1d4b5 3765
528c4ceb 3766 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 3767}
3768
8d1c802b 3769static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
0ae81335
DA		 3770{
3771 struct nl_info *info = &cfg->fc_nlinfo;
e3330039 3772 struct net *net = info->nl_net;
16a16cd3 3773 struct sk_buff *skb = NULL;
0ae81335 3774 struct fib6_table *table;
e3330039 3775 int err = -ENOENT;
0ae81335 3776
421842ed 3777 if (rt == net->ipv6.fib6_null_entry)
e3330039 3778 goto out_put;
93c2fb25 3779 table = rt->fib6_table;
66f5d6ce 3780 spin_lock_bh(&table->tb6_lock);
0ae81335 3781
93c2fb25 3782 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
8d1c802b 3783 struct fib6_info *sibling, *next_sibling;
0284696b 3784 struct fib6_node *fn;
0ae81335 3785
16a16cd3
DA		 3786 /* prefer to send a single notification with all hops */
3787 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3788 if (skb) {
3789 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3790
d4ead6b3 3791 if (rt6_fill_node(net, skb, rt, NULL,
16a16cd3
DA		 3792 NULL, NULL, 0, RTM_DELROUTE,
3793 info->portid, seq, 0) < 0) {
3794 kfree_skb(skb);
3795 skb = NULL;
3796 } else
3797 info->skip_notify = 1;
3798 }
3799
0284696b
IS		 3800 /* 'rt' points to the first sibling route. If it is not the
3801 * leaf, then we do not need to send a notification. Otherwise,
3802 * we need to check if the last sibling has a next route or not
3803 * and emit a replace or delete notification, respectively.
3804 */
2881fd61 3805 info->skip_notify_kernel = 1;
0284696b
IS		 3806 fn = rcu_dereference_protected(rt->fib6_node,
3807 lockdep_is_held(&table->tb6_lock));
3808 if (rcu_access_pointer(fn->leaf) == rt) {
3809 struct fib6_info *last_sibling, *replace_rt;
3810
3811 last_sibling = list_last_entry(&rt->fib6_siblings,
3812 struct fib6_info,
3813 fib6_siblings);
3814 replace_rt = rcu_dereference_protected(
3815 last_sibling->fib6_next,
3816 lockdep_is_held(&table->tb6_lock));
3817 if (replace_rt)
3818 call_fib6_entry_notifiers_replace(net,
3819 replace_rt);
3820 else
3821 call_fib6_multipath_entry_notifiers(net,
caafb250 3822 FIB_EVENT_ENTRY_DEL,
0284696b
IS		 3823 rt, rt->fib6_nsiblings,
3824 NULL);
3825 }
0ae81335 3826 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25
DA		 3827 &rt->fib6_siblings,
3828 fib6_siblings) {
0ae81335
DA		 3829 err = fib6_del(sibling, info);
3830 if (err)
e3330039 3831 goto out_unlock;
0ae81335
DA		 3832 }
3833 }
3834
3835 err = fib6_del(rt, info);
e3330039 3836out_unlock:
66f5d6ce 3837 spin_unlock_bh(&table->tb6_lock);
e3330039 3838out_put:
93531c67 3839 fib6_info_release(rt);
16a16cd3
DA		 3840
3841 if (skb) {
e3330039 3842 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
16a16cd3
DA		 3843 info->nlh, gfp_any());
3844 }
0ae81335
DA		 3845 return err;
3846}
3847
0fa6efc5 3848static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
23fb93a4
DA		 3849{
3850 int rc = -ESRCH;
3851
3852 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3853 goto out;
3854
3855 if (cfg->fc_flags & RTF_GATEWAY &&
3856 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3857 goto out;
761f6026
XL		 3858
3859 rc = rt6_remove_exception_rt(rt);
23fb93a4
DA		 3860out:
3861 return rc;
3862}
3863
0fa6efc5
DA		 3864static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
3865 struct fib6_nh *nh)
3866{
3867 struct fib6_result res = {
3868 .f6i = rt,
3869 .nh = nh,
3870 };
3871 struct rt6_info *rt_cache;
3872
3873 rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
3874 if (rt_cache)
3875 return __ip6_del_cached_rt(rt_cache, cfg);
3876
3877 return 0;
3878}
3879
5b98324e
DA		 3880struct fib6_nh_del_cached_rt_arg {
3881 struct fib6_config *cfg;
3882 struct fib6_info *f6i;
3883};
3884
3885static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg)
3886{
3887 struct fib6_nh_del_cached_rt_arg *arg = _arg;
3888 int rc;
3889
3890 rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh);
3891 return rc != -ESRCH ? rc : 0;
3892}
3893
3894static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i)
3895{
3896 struct fib6_nh_del_cached_rt_arg arg = {
3897 .cfg = cfg,
3898 .f6i = f6i
3899 };
3900
3901 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg);
3902}
3903
333c4301
DA		 3904static int ip6_route_del(struct fib6_config *cfg,
3905 struct netlink_ext_ack *extack)
1da177e4 3906{
c71099ac 3907 struct fib6_table *table;
8d1c802b 3908 struct fib6_info *rt;
1da177e4 3909 struct fib6_node *fn;
1da177e4
LT		 3910 int err = -ESRCH;
3911
5578689a 3912 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
d5d531cb
DA		 3913 if (!table) {
3914 NL_SET_ERR_MSG(extack, "FIB table does not exist");
c71099ac 3915 return err;
d5d531cb 3916 }
c71099ac 3917
66f5d6ce 3918 rcu_read_lock();
1da177e4 3919
c71099ac 3920 fn = fib6_locate(&table->tb6_root,
86872cb5 3921 &cfg->fc_dst, cfg->fc_dst_len,
38fbeeee 3922 &cfg->fc_src, cfg->fc_src_len,
2b760fcf 3923 !(cfg->fc_flags & RTF_CACHE));
1ab1457c 3924
1da177e4 3925 if (fn) {
66f5d6ce 3926 for_each_fib6_node_rt_rcu(fn) {
ad1601ae
DA		 3927 struct fib6_nh *nh;
3928
3401bfb1
SB		 3929 if (rt->nh && cfg->fc_nh_id &&
3930 rt->nh->id != cfg->fc_nh_id)
5b98324e 3931 continue;
23fb93a4 3932
5b98324e
DA		 3933 if (cfg->fc_flags & RTF_CACHE) {
3934 int rc = 0;
3935
3936 if (rt->nh) {
3937 rc = ip6_del_cached_rt_nh(cfg, rt);
3938 } else if (cfg->fc_nh_id) {
3939 continue;
3940 } else {
3941 nh = rt->fib6_nh;
3942 rc = ip6_del_cached_rt(cfg, rt, nh);
3943 }
0fa6efc5
DA		 3944 if (rc != -ESRCH) {
3945 rcu_read_unlock();
3946 return rc;
23fb93a4
DA		 3947 }
3948 continue;
2b760fcf 3949 }
ad1601ae 3950
5b98324e
DA		 3951 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
3952 continue;
3953 if (cfg->fc_protocol &&
3954 cfg->fc_protocol != rt->fib6_protocol)
3955 continue;
3956
3957 if (rt->nh) {
3958 if (!fib6_info_hold_safe(rt))
3959 continue;
3960 rcu_read_unlock();
3961
3962 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3963 }
3964 if (cfg->fc_nh_id)
3965 continue;
3966
3967 nh = rt->fib6_nh;
86872cb5 3968 if (cfg->fc_ifindex &&
ad1601ae
DA		 3969 (!nh->fib_nh_dev ||
3970 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
1da177e4 3971 continue;
86872cb5 3972 if (cfg->fc_flags & RTF_GATEWAY &&
ad1601ae 3973 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
1da177e4 3974 continue;
e873e4b9
WW		 3975 if (!fib6_info_hold_safe(rt))
3976 continue;
66f5d6ce 3977 rcu_read_unlock();
1da177e4 3978
0ae81335
DA		 3979 /* if gateway was specified only delete the one hop */
3980 if (cfg->fc_flags & RTF_GATEWAY)
3981 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3982
3983 return __ip6_del_rt_siblings(rt, cfg);
1da177e4
LT		 3984 }
3985 }
66f5d6ce 3986 rcu_read_unlock();
1da177e4
LT		 3987
3988 return err;
3989}
3990
6700c270 3991static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 3992{
a6279458 3993 struct netevent_redirect netevent;
e8599ff4 3994 struct rt6_info *rt, *nrt = NULL;
85bd05de 3995 struct fib6_result res = {};
e8599ff4
DM		 3996 struct ndisc_options ndopts;
3997 struct inet6_dev *in6_dev;
3998 struct neighbour *neigh;
71bcdba0 3999 struct rd_msg *msg;
6e157b6a
DM		 4000 int optlen, on_link;
4001 u8 *lladdr;
e8599ff4 4002
29a3cad5 4003 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 4004 optlen -= sizeof(*msg);
e8599ff4
DM		 4005
4006 if (optlen < 0) {
6e157b6a 4007 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 4008 return;
4009 }
4010
71bcdba0 4011 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 4012
71bcdba0 4013 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 4014 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 4015 return;
4016 }
4017
6e157b6a 4018 on_link = 0;
71bcdba0 4019 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 4020 on_link = 1;
71bcdba0 4021 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 4022 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 4023 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 4024 return;
4025 }
4026
4027 in6_dev = __in6_dev_get(skb->dev);
4028 if (!in6_dev)
4029 return;
4030 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
4031 return;
4032
4033 /* RFC2461 8.1:
4034 * The IP source address of the Redirect MUST be the same as the current
4035 * first-hop router for the specified ICMP Destination Address.
4036 */
4037
f997c55c 4038 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 4039 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
4040 return;
4041 }
6e157b6a
DM		 4042
4043 lladdr = NULL;
e8599ff4
DM		 4044 if (ndopts.nd_opts_tgt_lladdr) {
4045 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
4046 skb->dev);
4047 if (!lladdr) {
4048 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
4049 return;
4050 }
4051 }
4052
6e157b6a 4053 rt = (struct rt6_info *) dst;
ec13ad1d 4054 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 4055 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 4056 return;
6e157b6a 4057 }
e8599ff4 4058
6e157b6a
DM		 4059 /* Redirect received -> path was valid.
4060 * Look, redirects are sent only in response to data packets,
4061 * so that this nexthop apparently is reachable. --ANK
4062 */
0dec879f 4063 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
a6279458 4064
71bcdba0 4065 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 4066 if (!neigh)
4067 return;
a6279458 4068
1da177e4
LT		 4069 /*
4070 * We have finally decided to accept it.
4071 */
4072
f997c55c 4073 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 4074 NEIGH_UPDATE_F_WEAK_OVERRIDE|
4075 NEIGH_UPDATE_F_OVERRIDE|
4076 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 4077 NEIGH_UPDATE_F_ISROUTER)),
4078 NDISC_REDIRECT, &ndopts);
1da177e4 4079
4d85cd0c 4080 rcu_read_lock();
85bd05de 4081 res.f6i = rcu_dereference(rt->from);
ff24e498 4082 if (!res.f6i)
886b7a50 4083 goto out;
8a14e46f 4084
49d5b8ef
DA		 4085 if (res.f6i->nh) {
4086 struct fib6_nh_match_arg arg = {
4087 .dev = dst->dev,
4088 .gw = &rt->rt6i_gateway,
4089 };
4090
4091 nexthop_for_each_fib6_nh(res.f6i->nh,
4092 fib6_nh_find_match, &arg);
4093
4094 /* fib6_info uses a nexthop that does not have fib6_nh
4095 * using the dst->dev. Should be impossible
4096 */
4097 if (!arg.match)
4098 goto out;
4099 res.nh = arg.match;
4100 } else {
4101 res.nh = res.f6i->fib6_nh;
4102 }
4103
7d21fec9
DA		 4104 res.fib6_flags = res.f6i->fib6_flags;
4105 res.fib6_type = res.f6i->fib6_type;
85bd05de 4106 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
38308473 4107 if (!nrt)
1da177e4
LT		 4108 goto out;
4109
4110 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
4111 if (on_link)
4112 nrt->rt6i_flags &= ~RTF_GATEWAY;
4113
4e3fd7a0 4114 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 4115
886b7a50 4116 /* rt6_insert_exception() will take care of duplicated exceptions */
5012f0a5 4117 if (rt6_insert_exception(nrt, &res)) {
2b760fcf
WW		 4118 dst_release_immediate(&nrt->dst);
4119 goto out;
4120 }
1da177e4 4121
d8d1f30b
CG		 4122 netevent.old = &rt->dst;
4123 netevent.new = &nrt->dst;
71bcdba0 4124 netevent.daddr = &msg->dest;
60592833 4125 netevent.neigh = neigh;
8d71740c
TT		 4126 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
4127
1da177e4 4128out:
886b7a50 4129 rcu_read_unlock();
e8599ff4 4130 neigh_release(neigh);
6e157b6a
DM		 4131}
4132
70ceb4f5 4133#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 4134static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 4135 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 4136 const struct in6_addr *gwaddr,
4137 struct net_device *dev)
70ceb4f5 4138{
830218c1
DA		 4139 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4140 int ifindex = dev->ifindex;
70ceb4f5 4141 struct fib6_node *fn;
8d1c802b 4142 struct fib6_info *rt = NULL;
c71099ac
TG		 4143 struct fib6_table *table;
4144
830218c1 4145 table = fib6_get_table(net, tb_id);
38308473 4146 if (!table)
c71099ac 4147 return NULL;
70ceb4f5 4148
66f5d6ce 4149 rcu_read_lock();
38fbeeee 4150 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
70ceb4f5
YH		 4151 if (!fn)
4152 goto out;
4153
66f5d6ce 4154 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 4155 /* these routes do not use nexthops */
4156 if (rt->nh)
4157 continue;
1cf844c7 4158 if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex)
70ceb4f5 4159 continue;
2b2450ca 4160 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
1cf844c7 4161 !rt->fib6_nh->fib_nh_gw_family)
70ceb4f5 4162 continue;
1cf844c7 4163 if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr))
70ceb4f5 4164 continue;
e873e4b9
WW		 4165 if (!fib6_info_hold_safe(rt))
4166 continue;
70ceb4f5
YH		 4167 break;
4168 }
4169out:
66f5d6ce 4170 rcu_read_unlock();
70ceb4f5
YH		 4171 return rt;
4172}
4173
8d1c802b 4174static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 4175 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 4176 const struct in6_addr *gwaddr,
4177 struct net_device *dev,
95c96174 4178 unsigned int pref)
70ceb4f5 4179{
86872cb5 4180 struct fib6_config cfg = {
238fc7ea 4181 .fc_metric = IP6_RT_PRIO_USER,
830218c1 4182 .fc_ifindex = dev->ifindex,
86872cb5
TG		 4183 .fc_dst_len = prefixlen,
4184 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
4185 RTF_UP | RTF_PREF(pref),
b91d5329 4186 .fc_protocol = RTPROT_RA,
e8478e80 4187 .fc_type = RTN_UNICAST,
15e47304 4188 .fc_nlinfo.portid = 0,
efa2cea0
DL		 4189 .fc_nlinfo.nlh = NULL,
4190 .fc_nlinfo.nl_net = net,
86872cb5
TG		 4191 };
4192
91b2c9a0 4193 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 4194 cfg.fc_dst = *prefix;
4195 cfg.fc_gateway = *gwaddr;
70ceb4f5 4196
e317da96
YH		 4197 /* We should treat it as a default route if prefix length is 0. */
4198 if (!prefixlen)
86872cb5 4199 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 4200
acb54e3c 4201 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
70ceb4f5 4202
830218c1 4203 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
70ceb4f5
YH		 4204}
4205#endif
4206
8d1c802b 4207struct fib6_info *rt6_get_dflt_router(struct net *net,
afb1d4b5
DA		 4208 const struct in6_addr *addr,
4209 struct net_device *dev)
1ab1457c 4210{
830218c1 4211 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
8d1c802b 4212 struct fib6_info *rt;
c71099ac 4213 struct fib6_table *table;
1da177e4 4214
afb1d4b5 4215 table = fib6_get_table(net, tb_id);
38308473 4216 if (!table)
c71099ac 4217 return NULL;
1da177e4 4218
66f5d6ce
WW		 4219 rcu_read_lock();
4220 for_each_fib6_node_rt_rcu(&table->tb6_root) {
f88d8ea6 4221 struct fib6_nh *nh;
ad1601ae 4222
f88d8ea6
DA		 4223 /* RA routes do not use nexthops */
4224 if (rt->nh)
4225 continue;
4226
4227 nh = rt->fib6_nh;
ad1601ae 4228 if (dev == nh->fib_nh_dev &&
93c2fb25 4229 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
ad1601ae 4230 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
1da177e4
LT		 4231 break;
4232 }
e873e4b9
WW		 4233 if (rt && !fib6_info_hold_safe(rt))
4234 rt = NULL;
66f5d6ce 4235 rcu_read_unlock();
1da177e4
LT		 4236 return rt;
4237}
4238
8d1c802b 4239struct fib6_info *rt6_add_dflt_router(struct net *net,
afb1d4b5 4240 const struct in6_addr *gwaddr,
ebacaaa0 4241 struct net_device *dev,
6b2e04bc
PC		 4242 unsigned int pref,
4243 u32 defrtr_usr_metric)
1da177e4 4244{
86872cb5 4245 struct fib6_config cfg = {
ca254490 4246 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
6b2e04bc 4247 .fc_metric = defrtr_usr_metric,
86872cb5
TG		 4248 .fc_ifindex = dev->ifindex,
4249 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
4250 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
b91d5329 4251 .fc_protocol = RTPROT_RA,
e8478e80 4252 .fc_type = RTN_UNICAST,
15e47304 4253 .fc_nlinfo.portid = 0,
5578689a 4254 .fc_nlinfo.nlh = NULL,
afb1d4b5 4255 .fc_nlinfo.nl_net = net,
86872cb5 4256 };
1da177e4 4257
4e3fd7a0 4258 cfg.fc_gateway = *gwaddr;
1da177e4 4259
acb54e3c 4260 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
830218c1
DA		 4261 struct fib6_table *table;
4262
4263 table = fib6_get_table(dev_net(dev), cfg.fc_table);
4264 if (table)
4265 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
4266 }
1da177e4 4267
afb1d4b5 4268 return rt6_get_dflt_router(net, gwaddr, dev);
1da177e4
LT		 4269}
4270
afb1d4b5
DA		 4271static void __rt6_purge_dflt_routers(struct net *net,
4272 struct fib6_table *table)
1da177e4 4273{
8d1c802b 4274 struct fib6_info *rt;
1da177e4
LT		 4275
4276restart:
66f5d6ce
WW		 4277 rcu_read_lock();
4278 for_each_fib6_node_rt_rcu(&table->tb6_root) {
dcd1f572
DA		 4279 struct net_device *dev = fib6_info_nh_dev(rt);
4280 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
4281
93c2fb25 4282 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
e873e4b9
WW		 4283 (!idev || idev->cnf.accept_ra != 2) &&
4284 fib6_info_hold_safe(rt)) {
93531c67 4285 rcu_read_unlock();
11dd74b3 4286 ip6_del_rt(net, rt, false);
1da177e4
LT		 4287 goto restart;
4288 }
4289 }
66f5d6ce 4290 rcu_read_unlock();
830218c1
DA		 4291
4292 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
4293}
4294
4295void rt6_purge_dflt_routers(struct net *net)
4296{
4297 struct fib6_table *table;
4298 struct hlist_head *head;
4299 unsigned int h;
4300
4301 rcu_read_lock();
4302
4303 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
4304 head = &net->ipv6.fib_table_hash[h];
4305 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
4306 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
afb1d4b5 4307 __rt6_purge_dflt_routers(net, table);
830218c1
DA		 4308 }
4309 }
4310
4311 rcu_read_unlock();
1da177e4
LT		 4312}
4313
5578689a
DL		 4314static void rtmsg_to_fib6_config(struct net *net,
4315 struct in6_rtmsg *rtmsg,
86872cb5
TG		 4316 struct fib6_config *cfg)
4317{
8823a3ac
MŻ		 4318 *cfg = (struct fib6_config){
4319 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
4320 : RT6_TABLE_MAIN,
4321 .fc_ifindex = rtmsg->rtmsg_ifindex,
67f69513 4322 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
8823a3ac
MŻ		 4323 .fc_expires = rtmsg->rtmsg_info,
4324 .fc_dst_len = rtmsg->rtmsg_dst_len,
4325 .fc_src_len = rtmsg->rtmsg_src_len,
4326 .fc_flags = rtmsg->rtmsg_flags,
4327 .fc_type = rtmsg->rtmsg_type,
4328
4329 .fc_nlinfo.nl_net = net,
4330
4331 .fc_dst = rtmsg->rtmsg_dst,
4332 .fc_src = rtmsg->rtmsg_src,
4333 .fc_gateway = rtmsg->rtmsg_gateway,
4334 };
86872cb5
TG		 4335}
4336
7c1552da 4337int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg)
1da177e4 4338{
86872cb5 4339 struct fib6_config cfg;
1da177e4
LT		 4340 int err;
4341
7c1552da
CH		 4342 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
4343 return -EINVAL;
4344 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4345 return -EPERM;
86872cb5 4346
7c1552da 4347 rtmsg_to_fib6_config(net, rtmsg, &cfg);
1da177e4 4348
7c1552da
CH		 4349 rtnl_lock();
4350 switch (cmd) {
4351 case SIOCADDRT:
4352 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
4353 break;
4354 case SIOCDELRT:
4355 err = ip6_route_del(&cfg, NULL);
4356 break;
3ff50b79 4357 }
7c1552da
CH		 4358 rtnl_unlock();
4359 return err;
1da177e4
LT		 4360}
4361
4362/*
4363 * Drop the packet on the floor
4364 */
4365
d5fdd6ba 4366static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 4367{
adf30907 4368 struct dst_entry *dst = skb_dst(skb);
1d3fd8a1
SS		 4369 struct net *net = dev_net(dst->dev);
4370 struct inet6_dev *idev;
4371 int type;
4372
4373 if (netif_is_l3_master(skb->dev) &&
4374 dst->dev == net->loopback_dev)
4375 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
4376 else
4377 idev = ip6_dst_idev(dst);
4378
612f09e8
YH		 4379 switch (ipstats_mib_noroutes) {
4380 case IPSTATS_MIB_INNOROUTES:
0660e03f 4381 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 4382 if (type == IPV6_ADDR_ANY) {
1d3fd8a1 4383 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 4384 break;
4385 }
a8eceea8 4386 fallthrough;
612f09e8 4387 case IPSTATS_MIB_OUTNOROUTES:
1d3fd8a1 4388 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
612f09e8
YH		 4389 break;
4390 }
1d3fd8a1
SS		 4391
4392 /* Start over by dropping the dst for l3mdev case */
4393 if (netif_is_l3_master(skb->dev))
4394 skb_dst_drop(skb);
4395
3ffe533c 4396 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 4397 kfree_skb(skb);
4398 return 0;
4399}
4400
9ce8ade0
TG		 4401static int ip6_pkt_discard(struct sk_buff *skb)
4402{
612f09e8 4403 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 4404}
4405
ede2059d 4406static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 4407{
adf30907 4408 skb->dev = skb_dst(skb)->dev;
612f09e8 4409 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 4410}
4411
9ce8ade0
TG		 4412static int ip6_pkt_prohibit(struct sk_buff *skb)
4413{
612f09e8 4414 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 4415}
4416
ede2059d 4417static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 4418{
adf30907 4419 skb->dev = skb_dst(skb)->dev;
612f09e8 4420 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 4421}
4422
1da177e4
LT		 4423/*
4424 * Allocate a dst for local (unicast / anycast) address.
4425 */
4426
360a9887
DA		 4427struct fib6_info *addrconf_f6i_alloc(struct net *net,
4428 struct inet6_dev *idev,
4429 const struct in6_addr *addr,
4430 bool anycast, gfp_t gfp_flags)
1da177e4 4431{
c7a1ce39
DA		 4432 struct fib6_config cfg = {
4433 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
4434 .fc_ifindex = idev->dev->ifindex,
d55a2e37 4435 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c7a1ce39
DA		 4436 .fc_dst = *addr,
4437 .fc_dst_len = 128,
4438 .fc_protocol = RTPROT_KERNEL,
4439 .fc_nlinfo.nl_net = net,
4440 .fc_ignore_dev_down = true,
4441 };
d55a2e37 4442 struct fib6_info *f6i;
1da177e4 4443
e8478e80 4444 if (anycast) {
c7a1ce39
DA		 4445 cfg.fc_type = RTN_ANYCAST;
4446 cfg.fc_flags |= RTF_ANYCAST;
e8478e80 4447 } else {
c7a1ce39
DA		 4448 cfg.fc_type = RTN_LOCAL;
4449 cfg.fc_flags |= RTF_LOCAL;
e8478e80 4450 }
1da177e4 4451
d55a2e37 4452 f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
8652f17c 4453 if (!IS_ERR(f6i))
d55a2e37
MŻ		 4454 f6i->dst_nocount = true;
4455 return f6i;
1da177e4
LT		 4456}
4457
c3968a85
DW		 4458/* remove deleted ip from prefsrc entries */
4459struct arg_dev_net_ip {
4460 struct net_device *dev;
4461 struct net *net;
4462 struct in6_addr *addr;
4463};
4464
8d1c802b 4465static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
c3968a85
DW		 4466{
4467 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
4468 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
4469 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
4470
f88d8ea6
DA		 4471 if (!rt->nh &&
4472 ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) &&
421842ed 4473 rt != net->ipv6.fib6_null_entry &&
93c2fb25 4474 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
60006a48 4475 spin_lock_bh(&rt6_exception_lock);
c3968a85 4476 /* remove prefsrc entry */
93c2fb25 4477 rt->fib6_prefsrc.plen = 0;
60006a48 4478 spin_unlock_bh(&rt6_exception_lock);
c3968a85
DW		 4479 }
4480 return 0;
4481}
4482
4483void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
4484{
4485 struct net *net = dev_net(ifp->idev->dev);
4486 struct arg_dev_net_ip adni = {
4487 .dev = ifp->idev->dev,
4488 .net = net,
4489 .addr = &ifp->addr,
4490 };
0c3584d5 4491 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 4492}
4493
2b2450ca 4494#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
be7a010d
DJ		 4495
4496/* Remove routers and update dst entries when gateway turn into host. */
8d1c802b 4497static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
be7a010d
DJ		 4498{
4499 struct in6_addr *gateway = (struct in6_addr *)arg;
f88d8ea6
DA		 4500 struct fib6_nh *nh;
4501
4502 /* RA routes do not use nexthops */
4503 if (rt->nh)
4504 return 0;
be7a010d 4505
f88d8ea6 4506 nh = rt->fib6_nh;
93c2fb25 4507 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
cc5c073a 4508 nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6))
be7a010d 4509 return -1;
b16cb459
WW		 4510
4511 /* Further clean up cached routes in exception table.
4512 * This is needed because cached route may have a different
4513 * gateway than its 'parent' in the case of an ip redirect.
4514 */
cc5c073a 4515 fib6_nh_exceptions_clean_tohost(nh, gateway);
b16cb459 4516
be7a010d
DJ		 4517 return 0;
4518}
4519
4520void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
4521{
4522 fib6_clean_all(net, fib6_clean_tohost, gateway);
4523}
4524
2127d95a
IS		 4525struct arg_netdev_event {
4526 const struct net_device *dev;
4c981e28 4527 union {
ecc5663c 4528 unsigned char nh_flags;
4c981e28
IS		 4529 unsigned long event;
4530 };
2127d95a
IS		 4531};
4532
8d1c802b 4533static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
d7dedee1 4534{
8d1c802b 4535 struct fib6_info *iter;
d7dedee1
IS		 4536 struct fib6_node *fn;
4537
93c2fb25
DA		 4538 fn = rcu_dereference_protected(rt->fib6_node,
4539 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 4540 iter = rcu_dereference_protected(fn->leaf,
93c2fb25 4541 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 4542 while (iter) {
93c2fb25 4543 if (iter->fib6_metric == rt->fib6_metric &&
33bd5ac5 4544 rt6_qualify_for_ecmp(iter))
d7dedee1 4545 return iter;
8fb11a9a 4546 iter = rcu_dereference_protected(iter->fib6_next,
93c2fb25 4547 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1
IS		 4548 }
4549
4550 return NULL;
4551}
4552
f88d8ea6 4553/* only called for fib entries with builtin fib6_nh */
8d1c802b 4554static bool rt6_is_dead(const struct fib6_info *rt)
d7dedee1 4555{
1cf844c7
DA		 4556 if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD ||
4557 (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN &&
4558 ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev)))
d7dedee1
IS		 4559 return true;
4560
4561 return false;
4562}
4563
8d1c802b 4564static int rt6_multipath_total_weight(const struct fib6_info *rt)
d7dedee1 4565{
8d1c802b 4566 struct fib6_info *iter;
d7dedee1
IS		 4567 int total = 0;
4568
4569 if (!rt6_is_dead(rt))
1cf844c7 4570 total += rt->fib6_nh->fib_nh_weight;
d7dedee1 4571
93c2fb25 4572 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
d7dedee1 4573 if (!rt6_is_dead(iter))
1cf844c7 4574 total += iter->fib6_nh->fib_nh_weight;
d7dedee1
IS		 4575 }
4576
4577 return total;
4578}
4579
8d1c802b 4580static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
d7dedee1
IS		 4581{
4582 int upper_bound = -1;
4583
4584 if (!rt6_is_dead(rt)) {
1cf844c7 4585 *weight += rt->fib6_nh->fib_nh_weight;
d7dedee1
IS		 4586 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
4587 total) - 1;
4588 }
1cf844c7 4589 atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound);
d7dedee1
IS		 4590}
4591
8d1c802b 4592static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
d7dedee1 4593{
8d1c802b 4594 struct fib6_info *iter;
d7dedee1
IS		 4595 int weight = 0;
4596
4597 rt6_upper_bound_set(rt, &weight, total);
4598
93c2fb25 4599 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
d7dedee1
IS		 4600 rt6_upper_bound_set(iter, &weight, total);
4601}
4602
8d1c802b 4603void rt6_multipath_rebalance(struct fib6_info *rt)
d7dedee1 4604{
8d1c802b 4605 struct fib6_info *first;
d7dedee1
IS		 4606 int total;
4607
4608 /* In case the entire multipath route was marked for flushing,
4609 * then there is no need to rebalance upon the removal of every
4610 * sibling route.
4611 */
93c2fb25 4612 if (!rt->fib6_nsiblings || rt->should_flush)
d7dedee1
IS		 4613 return;
4614
4615 /* During lookup routes are evaluated in order, so we need to
4616 * make sure upper bounds are assigned from the first sibling
4617 * onwards.
4618 */
4619 first = rt6_multipath_first_sibling(rt);
4620 if (WARN_ON_ONCE(!first))
4621 return;
4622
4623 total = rt6_multipath_total_weight(first);
4624 rt6_multipath_upper_bound_set(first, total);
4625}
4626
8d1c802b 4627static int fib6_ifup(struct fib6_info *rt, void *p_arg)
2127d95a
IS		 4628{
4629 const struct arg_netdev_event *arg = p_arg;
7aef6859 4630 struct net *net = dev_net(arg->dev);
2127d95a 4631
f88d8ea6 4632 if (rt != net->ipv6.fib6_null_entry && !rt->nh &&
1cf844c7
DA		 4633 rt->fib6_nh->fib_nh_dev == arg->dev) {
4634 rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags;
7aef6859 4635 fib6_update_sernum_upto_root(net, rt);
d7dedee1 4636 rt6_multipath_rebalance(rt);
1de178ed 4637 }
2127d95a
IS		 4638
4639 return 0;
4640}
4641
ecc5663c 4642void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
2127d95a
IS		 4643{
4644 struct arg_netdev_event arg = {
4645 .dev = dev,
6802f3ad
IS		 4646 {
4647 .nh_flags = nh_flags,
4648 },
2127d95a
IS		 4649 };
4650
4651 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4652 arg.nh_flags |= RTNH_F_LINKDOWN;
4653
4654 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4655}
4656
f88d8ea6 4657/* only called for fib entries with inline fib6_nh */
8d1c802b 4658static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
1de178ed
IS		 4659 const struct net_device *dev)
4660{
8d1c802b 4661 struct fib6_info *iter;
1de178ed 4662
1cf844c7 4663 if (rt->fib6_nh->fib_nh_dev == dev)
1de178ed 4664 return true;
93c2fb25 4665 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7 4666 if (iter->fib6_nh->fib_nh_dev == dev)
1de178ed
IS		 4667 return true;
4668
4669 return false;
4670}
4671
8d1c802b 4672static void rt6_multipath_flush(struct fib6_info *rt)
1de178ed 4673{
8d1c802b 4674 struct fib6_info *iter;
1de178ed
IS		 4675
4676 rt->should_flush = 1;
93c2fb25 4677 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1de178ed
IS		 4678 iter->should_flush = 1;
4679}
4680
8d1c802b 4681static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
1de178ed
IS		 4682 const struct net_device *down_dev)
4683{
8d1c802b 4684 struct fib6_info *iter;
1de178ed
IS		 4685 unsigned int dead = 0;
4686
1cf844c7
DA		 4687 if (rt->fib6_nh->fib_nh_dev == down_dev ||
4688 rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
1de178ed 4689 dead++;
93c2fb25 4690 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7
DA		 4691 if (iter->fib6_nh->fib_nh_dev == down_dev ||
4692 iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
1de178ed
IS		 4693 dead++;
4694
4695 return dead;
4696}
4697
8d1c802b 4698static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
1de178ed 4699 const struct net_device *dev,
ecc5663c 4700 unsigned char nh_flags)
1de178ed 4701{
8d1c802b 4702 struct fib6_info *iter;
1de178ed 4703
1cf844c7
DA		 4704 if (rt->fib6_nh->fib_nh_dev == dev)
4705 rt->fib6_nh->fib_nh_flags |= nh_flags;
93c2fb25 4706 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7
DA		 4707 if (iter->fib6_nh->fib_nh_dev == dev)
4708 iter->fib6_nh->fib_nh_flags |= nh_flags;
1de178ed
IS		 4709}
4710
a1a22c12 4711/* called with write lock held for table with rt */
8d1c802b 4712static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
1da177e4 4713{
4c981e28
IS		 4714 const struct arg_netdev_event *arg = p_arg;
4715 const struct net_device *dev = arg->dev;
7aef6859 4716 struct net *net = dev_net(dev);
8ed67789 4717
f88d8ea6 4718 if (rt == net->ipv6.fib6_null_entry || rt->nh)
27c6fa73
IS		 4719 return 0;
4720
4721 switch (arg->event) {
4722 case NETDEV_UNREGISTER:
1cf844c7 4723 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
27c6fa73 4724 case NETDEV_DOWN:
1de178ed 4725 if (rt->should_flush)
27c6fa73 4726 return -1;
93c2fb25 4727 if (!rt->fib6_nsiblings)
1cf844c7 4728 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
1de178ed
IS		 4729 if (rt6_multipath_uses_dev(rt, dev)) {
4730 unsigned int count;
4731
4732 count = rt6_multipath_dead_count(rt, dev);
93c2fb25 4733 if (rt->fib6_nsiblings + 1 == count) {
1de178ed
IS		 4734 rt6_multipath_flush(rt);
4735 return -1;
4736 }
4737 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4738 RTNH_F_LINKDOWN);
7aef6859 4739 fib6_update_sernum(net, rt);
d7dedee1 4740 rt6_multipath_rebalance(rt);
1de178ed
IS		 4741 }
4742 return -2;
27c6fa73 4743 case NETDEV_CHANGE:
1cf844c7 4744 if (rt->fib6_nh->fib_nh_dev != dev ||
93c2fb25 4745 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
27c6fa73 4746 break;
1cf844c7 4747 rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
d7dedee1 4748 rt6_multipath_rebalance(rt);
27c6fa73 4749 break;
2b241361 4750 }
c159d30c 4751
1da177e4
LT		 4752 return 0;
4753}
4754
27c6fa73 4755void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
1da177e4 4756{
4c981e28 4757 struct arg_netdev_event arg = {
8ed67789 4758 .dev = dev,
6802f3ad
IS		 4759 {
4760 .event = event,
4761 },
8ed67789 4762 };
7c6bb7d2 4763 struct net *net = dev_net(dev);
8ed67789 4764
7c6bb7d2
DA		 4765 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4766 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4767 else
4768 fib6_clean_all(net, fib6_ifdown, &arg);
4c981e28
IS		 4769}
4770
4771void rt6_disable_ip(struct net_device *dev, unsigned long event)
4772{
4773 rt6_sync_down_dev(dev, event);
4774 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4775 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 4776}
4777
95c96174 4778struct rt6_mtu_change_arg {
1da177e4 4779 struct net_device *dev;
95c96174 4780 unsigned int mtu;
c0b220cf 4781 struct fib6_info *f6i;
1da177e4
LT		 4782};
4783
cc5c073a 4784static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg)
c0b220cf
DA		 4785{
4786 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg;
cc5c073a 4787 struct fib6_info *f6i = arg->f6i;
c0b220cf
DA		 4788
4789 /* For administrative MTU increase, there is no way to discover
4790 * IPv6 PMTU increase, so PMTU increase should be updated here.
4791 * Since RFC 1981 doesn't include administrative MTU increase
4792 * update PMTU increase is a MUST. (i.e. jumbo frame)
4793 */
4794 if (nh->fib_nh_dev == arg->dev) {
4795 struct inet6_dev *idev = __in6_dev_get(arg->dev);
4796 u32 mtu = f6i->fib6_pmtu;
4797
4798 if (mtu >= arg->mtu ||
4799 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4800 fib6_metric_set(f6i, RTAX_MTU, arg->mtu);
4801
4802 spin_lock_bh(&rt6_exception_lock);
cc5c073a 4803 rt6_exceptions_update_pmtu(idev, nh, arg->mtu);
c0b220cf
DA		 4804 spin_unlock_bh(&rt6_exception_lock);
4805 }
4806
4807 return 0;
4808}
4809
4810static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
1da177e4
LT		 4811{
4812 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4813 struct inet6_dev *idev;
4814
4815 /* In IPv6 pmtu discovery is not optional,
4816 so that RTAX_MTU lock cannot disable it.
4817 We still use this lock to block changes
4818 caused by addrconf/ndisc.
4819 */
4820
4821 idev = __in6_dev_get(arg->dev);
38308473 4822 if (!idev)
1da177e4
LT		 4823 return 0;
4824
c0b220cf
DA		 4825 if (fib6_metric_locked(f6i, RTAX_MTU))
4826 return 0;
d4ead6b3 4827
c0b220cf 4828 arg->f6i = f6i;
2d44234b
DA		 4829 if (f6i->nh) {
4830 /* fib6_nh_mtu_change only returns 0, so this is safe */
4831 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change,
4832 arg);
4833 }
4834
1cf844c7 4835 return fib6_nh_mtu_change(f6i->fib6_nh, arg);
1da177e4
LT		 4836}
4837
95c96174 4838void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 4839{
c71099ac
TG		 4840 struct rt6_mtu_change_arg arg = {
4841 .dev = dev,
4842 .mtu = mtu,
4843 };
1da177e4 4844
0c3584d5 4845 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 4846}
4847
ef7c79ed 4848static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
75425657 4849 [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
5176f91e 4850 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
aa8f8778 4851 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
86872cb5 4852 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 4853 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 4854 [RTA_PRIORITY] = { .type = NLA_U32 },
4855 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 4856 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 4857 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 4858 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4859 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 4860 [RTA_EXPIRES] = { .type = NLA_U32 },
622ec2c9 4861 [RTA_UID] = { .type = NLA_U32 },
3b45a410 4862 [RTA_MARK] = { .type = NLA_U32 },
aa8f8778 4863 [RTA_TABLE] = { .type = NLA_U32 },
eacb9384
RP		 4864 [RTA_IP_PROTO] = { .type = NLA_U8 },
4865 [RTA_SPORT] = { .type = NLA_U16 },
4866 [RTA_DPORT] = { .type = NLA_U16 },
5b98324e 4867 [RTA_NH_ID] = { .type = NLA_U32 },
86872cb5
TG		 4868};
4869
4870static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
333c4301
DA		 4871 struct fib6_config *cfg,
4872 struct netlink_ext_ack *extack)
1da177e4 4873{
86872cb5
TG		 4874 struct rtmsg *rtm;
4875 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 4876 unsigned int pref;
86872cb5 4877 int err;
1da177e4 4878
8cb08174
JB		 4879 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
4880 rtm_ipv6_policy, extack);
86872cb5
TG		 4881 if (err < 0)
4882 goto errout;
1da177e4 4883
86872cb5
TG		 4884 err = -EINVAL;
4885 rtm = nlmsg_data(nlh);
86872cb5 4886
84db8407
MŻ		 4887 *cfg = (struct fib6_config){
4888 .fc_table = rtm->rtm_table,
4889 .fc_dst_len = rtm->rtm_dst_len,
4890 .fc_src_len = rtm->rtm_src_len,
4891 .fc_flags = RTF_UP,
4892 .fc_protocol = rtm->rtm_protocol,
4893 .fc_type = rtm->rtm_type,
4894
4895 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
4896 .fc_nlinfo.nlh = nlh,
4897 .fc_nlinfo.nl_net = sock_net(skb->sk),
4898 };
86872cb5 4899
ef2c7d7b
ND		 4900 if (rtm->rtm_type == RTN_UNREACHABLE ||
4901 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 4902 rtm->rtm_type == RTN_PROHIBIT ||
4903 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 4904 cfg->fc_flags |= RTF_REJECT;
4905
ab79ad14
MŻ		 4906 if (rtm->rtm_type == RTN_LOCAL)
4907 cfg->fc_flags |= RTF_LOCAL;
4908
1f56a01f
MKL		 4909 if (rtm->rtm_flags & RTM_F_CLONED)
4910 cfg->fc_flags |= RTF_CACHE;
4911
fc1e64e1
DA		 4912 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
4913
5b98324e
DA		 4914 if (tb[RTA_NH_ID]) {
4915 if (tb[RTA_GATEWAY] || tb[RTA_OIF] ||
4916 tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) {
4917 NL_SET_ERR_MSG(extack,
4918 "Nexthop specification and nexthop id are mutually exclusive");
4919 goto errout;
4920 }
4921 cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]);
4922 }
4923
86872cb5 4924 if (tb[RTA_GATEWAY]) {
67b61f6c 4925 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 4926 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 4927 }
e3818541
DA		 4928 if (tb[RTA_VIA]) {
4929 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
4930 goto errout;
4931 }
86872cb5
TG		 4932
4933 if (tb[RTA_DST]) {
4934 int plen = (rtm->rtm_dst_len + 7) >> 3;
4935
4936 if (nla_len(tb[RTA_DST]) < plen)
4937 goto errout;
4938
4939 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 4940 }
86872cb5
TG		 4941
4942 if (tb[RTA_SRC]) {
4943 int plen = (rtm->rtm_src_len + 7) >> 3;
4944
4945 if (nla_len(tb[RTA_SRC]) < plen)
4946 goto errout;
4947
4948 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 4949 }
86872cb5 4950
c3968a85 4951 if (tb[RTA_PREFSRC])
67b61f6c 4952 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 4953
86872cb5
TG		 4954 if (tb[RTA_OIF])
4955 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
4956
4957 if (tb[RTA_PRIORITY])
4958 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
4959
4960 if (tb[RTA_METRICS]) {
4961 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
4962 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 4963 }
86872cb5
TG		 4964
4965 if (tb[RTA_TABLE])
4966 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
4967
51ebd318
ND		 4968 if (tb[RTA_MULTIPATH]) {
4969 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
4970 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
9ed59592
DA		 4971
4972 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
c255bd68 4973 cfg->fc_mp_len, extack);
9ed59592
DA		 4974 if (err < 0)
4975 goto errout;
51ebd318
ND		 4976 }
4977
c78ba6d6
LR		 4978 if (tb[RTA_PREF]) {
4979 pref = nla_get_u8(tb[RTA_PREF]);
4980 if (pref != ICMPV6_ROUTER_PREF_LOW &&
4981 pref != ICMPV6_ROUTER_PREF_HIGH)
4982 pref = ICMPV6_ROUTER_PREF_MEDIUM;
4983 cfg->fc_flags |= RTF_PREF(pref);
4984 }
4985
19e42e45
RP		 4986 if (tb[RTA_ENCAP])
4987 cfg->fc_encap = tb[RTA_ENCAP];
4988
9ed59592 4989 if (tb[RTA_ENCAP_TYPE]) {
19e42e45
RP		 4990 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
4991
c255bd68 4992 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
9ed59592
DA		 4993 if (err < 0)
4994 goto errout;
4995 }
4996
32bc201e
XL		 4997 if (tb[RTA_EXPIRES]) {
4998 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
4999
5000 if (addrconf_finite_timeout(timeout)) {
5001 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
5002 cfg->fc_flags |= RTF_EXPIRES;
5003 }
5004 }
5005
86872cb5
TG		 5006 err = 0;
5007errout:
5008 return err;
1da177e4
LT		 5009}
5010
6b9ea5a6 5011struct rt6_nh {
8d1c802b 5012 struct fib6_info *fib6_info;
6b9ea5a6 5013 struct fib6_config r_cfg;
6b9ea5a6
RP		 5014 struct list_head next;
5015};
5016
d4ead6b3
DA		 5017static int ip6_route_info_append(struct net *net,
5018 struct list_head *rt6_nh_list,
8d1c802b
DA		 5019 struct fib6_info *rt,
5020 struct fib6_config *r_cfg)
6b9ea5a6
RP		 5021{
5022 struct rt6_nh *nh;
6b9ea5a6
RP		 5023 int err = -EEXIST;
5024
5025 list_for_each_entry(nh, rt6_nh_list, next) {
8d1c802b
DA		 5026 /* check if fib6_info already exists */
5027 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
6b9ea5a6
RP		 5028 return err;
5029 }
5030
5031 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
5032 if (!nh)
5033 return -ENOMEM;
8d1c802b 5034 nh->fib6_info = rt;
6b9ea5a6
RP		 5035 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
5036 list_add_tail(&nh->next, rt6_nh_list);
5037
5038 return 0;
5039}
5040
8d1c802b
DA		 5041static void ip6_route_mpath_notify(struct fib6_info *rt,
5042 struct fib6_info *rt_last,
3b1137fe
DA		 5043 struct nl_info *info,
5044 __u16 nlflags)
5045{
5046 /* if this is an APPEND route, then rt points to the first route
5047 * inserted and rt_last points to last route inserted. Userspace
5048 * wants a consistent dump of the route which starts at the first
5049 * nexthop. Since sibling routes are always added at the end of
5050 * the list, find the first sibling of the last route appended
5051 */
93c2fb25
DA		 5052 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
5053 rt = list_first_entry(&rt_last->fib6_siblings,
8d1c802b 5054 struct fib6_info,
93c2fb25 5055 fib6_siblings);
3b1137fe
DA		 5056 }
5057
5058 if (rt)
5059 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
5060}
5061
0ee0f47c
IS		 5062static bool ip6_route_mpath_should_notify(const struct fib6_info *rt)
5063{
5064 bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
5065 bool should_notify = false;
5066 struct fib6_info *leaf;
5067 struct fib6_node *fn;
5068
5069 rcu_read_lock();
5070 fn = rcu_dereference(rt->fib6_node);
5071 if (!fn)
5072 goto out;
5073
5074 leaf = rcu_dereference(fn->leaf);
5075 if (!leaf)
5076 goto out;
5077
5078 if (rt == leaf ||
5079 (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric &&
5080 rt6_qualify_for_ecmp(leaf)))
5081 should_notify = true;
5082out:
5083 rcu_read_unlock();
5084
5085 return should_notify;
5086}
5087
333c4301
DA		 5088static int ip6_route_multipath_add(struct fib6_config *cfg,
5089 struct netlink_ext_ack *extack)
51ebd318 5090{
8d1c802b 5091 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
3b1137fe 5092 struct nl_info *info = &cfg->fc_nlinfo;
51ebd318
ND		 5093 struct fib6_config r_cfg;
5094 struct rtnexthop *rtnh;
8d1c802b 5095 struct fib6_info *rt;
6b9ea5a6
RP		 5096 struct rt6_nh *err_nh;
5097 struct rt6_nh *nh, *nh_safe;
3b1137fe 5098 __u16 nlflags;
51ebd318
ND		 5099 int remaining;
5100 int attrlen;
6b9ea5a6
RP		 5101 int err = 1;
5102 int nhn = 0;
5103 int replace = (cfg->fc_nlinfo.nlh &&
5104 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
5105 LIST_HEAD(rt6_nh_list);
51ebd318 5106
3b1137fe
DA		 5107 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
5108 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
5109 nlflags |= NLM_F_APPEND;
5110
35f1b4e9 5111 remaining = cfg->fc_mp_len;
51ebd318 5112 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 5113
6b9ea5a6 5114 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
8d1c802b 5115 * fib6_info structs per nexthop
6b9ea5a6 5116 */
51ebd318
ND		 5117 while (rtnh_ok(rtnh, remaining)) {
5118 memcpy(&r_cfg, cfg, sizeof(*cfg));
5119 if (rtnh->rtnh_ifindex)
5120 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5121
5122 attrlen = rtnh_attrlen(rtnh);
5123 if (attrlen > 0) {
5124 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5125
5126 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5127 if (nla) {
67b61f6c 5128 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 5129 r_cfg.fc_flags |= RTF_GATEWAY;
5130 }
19e42e45
RP		 5131 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
5132 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
5133 if (nla)
5134 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 5135 }
6b9ea5a6 5136
68e2ffde 5137 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
acb54e3c 5138 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
8c5b83f0
RP		 5139 if (IS_ERR(rt)) {
5140 err = PTR_ERR(rt);
5141 rt = NULL;
6b9ea5a6 5142 goto cleanup;
8c5b83f0 5143 }
b5d2d75e
DA		 5144 if (!rt6_qualify_for_ecmp(rt)) {
5145 err = -EINVAL;
5146 NL_SET_ERR_MSG(extack,
5147 "Device only routes can not be added for IPv6 using the multipath API.");
5148 fib6_info_release(rt);
5149 goto cleanup;
5150 }
6b9ea5a6 5151
1cf844c7 5152 rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1;
398958ae 5153
d4ead6b3
DA		 5154 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
5155 rt, &r_cfg);
51ebd318 5156 if (err) {
93531c67 5157 fib6_info_release(rt);
6b9ea5a6
RP		 5158 goto cleanup;
5159 }
5160
5161 rtnh = rtnh_next(rtnh, &remaining);
5162 }
5163
9eee3b49
IS		 5164 if (list_empty(&rt6_nh_list)) {
5165 NL_SET_ERR_MSG(extack,
5166 "Invalid nexthop configuration - no valid nexthops");
5167 return -EINVAL;
5168 }
5169
3b1137fe
DA		 5170 /* for add and replace send one notification with all nexthops.
5171 * Skip the notification in fib6_add_rt2node and send one with
5172 * the full route when done
5173 */
5174 info->skip_notify = 1;
5175
ebee3cad
IS		 5176 /* For add and replace, send one notification with all nexthops. For
5177 * append, send one notification with all appended nexthops.
5178 */
5179 info->skip_notify_kernel = 1;
5180
6b9ea5a6
RP		 5181 err_nh = NULL;
5182 list_for_each_entry(nh, &rt6_nh_list, next) {
8d1c802b
DA		 5183 err = __ip6_ins_rt(nh->fib6_info, info, extack);
5184 fib6_info_release(nh->fib6_info);
93531c67 5185
f7225172
DA		 5186 if (!err) {
5187 /* save reference to last route successfully inserted */
5188 rt_last = nh->fib6_info;
5189
5190 /* save reference to first route for notification */
5191 if (!rt_notif)
5192 rt_notif = nh->fib6_info;
5193 }
3b1137fe 5194
8d1c802b
DA		 5195 /* nh->fib6_info is used or freed at this point, reset to NULL*/
5196 nh->fib6_info = NULL;
6b9ea5a6
RP		 5197 if (err) {
5198 if (replace && nhn)
a5a82d84
JK		 5199 NL_SET_ERR_MSG_MOD(extack,
5200 "multipath route replace failed (check consistency of installed routes)");
6b9ea5a6
RP		 5201 err_nh = nh;
5202 goto add_errout;
51ebd318 5203 }
6b9ea5a6 5204
1a72418b 5205 /* Because each route is added like a single route we remove
27596472
MK		 5206 * these flags after the first nexthop: if there is a collision,
5207 * we have already failed to add the first nexthop:
5208 * fib6_add_rt2node() has rejected it; when replacing, old
5209 * nexthops have been replaced by first new, the rest should
5210 * be added to it.
1a72418b 5211 */
27596472
MK		 5212 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
5213 NLM_F_REPLACE);
afecdb37 5214 cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
6b9ea5a6
RP		 5215 nhn++;
5216 }
5217
0ee0f47c
IS		 5218 /* An in-kernel notification should only be sent in case the new
5219 * multipath route is added as the first route in the node, or if
5220 * it was appended to it. We pass 'rt_notif' since it is the first
5221 * sibling and might allow us to skip some checks in the replace case.
5222 */
5223 if (ip6_route_mpath_should_notify(rt_notif)) {
5224 enum fib_event_type fib_event;
5225
5226 if (rt_notif->fib6_nsiblings != nhn - 1)
5227 fib_event = FIB_EVENT_ENTRY_APPEND;
5228 else
caafb250 5229 fib_event = FIB_EVENT_ENTRY_REPLACE;
0ee0f47c
IS		 5230
5231 err = call_fib6_multipath_entry_notifiers(info->nl_net,
5232 fib_event, rt_notif,
5233 nhn - 1, extack);
5234 if (err) {
5235 /* Delete all the siblings that were just added */
5236 err_nh = NULL;
5237 goto add_errout;
5238 }
5239 }
ebee3cad 5240
3b1137fe
DA		 5241 /* success ... tell user about new route */
5242 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
6b9ea5a6
RP		 5243 goto cleanup;
5244
5245add_errout:
3b1137fe
DA		 5246 /* send notification for routes that were added so that
5247 * the delete notifications sent by ip6_route_del are
5248 * coherent
5249 */
5250 if (rt_notif)
5251 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5252
6b9ea5a6
RP		 5253 /* Delete routes that were already added */
5254 list_for_each_entry(nh, &rt6_nh_list, next) {
5255 if (err_nh == nh)
5256 break;
333c4301 5257 ip6_route_del(&nh->r_cfg, extack);
6b9ea5a6
RP		 5258 }
5259
5260cleanup:
5261 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
8d1c802b
DA		 5262 if (nh->fib6_info)
5263 fib6_info_release(nh->fib6_info);
6b9ea5a6
RP		 5264 list_del(&nh->next);
5265 kfree(nh);
5266 }
5267
5268 return err;
5269}
5270
333c4301
DA		 5271static int ip6_route_multipath_del(struct fib6_config *cfg,
5272 struct netlink_ext_ack *extack)
6b9ea5a6
RP		 5273{
5274 struct fib6_config r_cfg;
5275 struct rtnexthop *rtnh;
2291267e 5276 int last_err = 0;
6b9ea5a6
RP		 5277 int remaining;
5278 int attrlen;
2291267e 5279 int err;
6b9ea5a6
RP		 5280
5281 remaining = cfg->fc_mp_len;
5282 rtnh = (struct rtnexthop *)cfg->fc_mp;
5283
5284 /* Parse a Multipath Entry */
5285 while (rtnh_ok(rtnh, remaining)) {
5286 memcpy(&r_cfg, cfg, sizeof(*cfg));
5287 if (rtnh->rtnh_ifindex)
5288 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5289
5290 attrlen = rtnh_attrlen(rtnh);
5291 if (attrlen > 0) {
5292 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5293
5294 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5295 if (nla) {
5296 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
5297 r_cfg.fc_flags |= RTF_GATEWAY;
5298 }
5299 }
333c4301 5300 err = ip6_route_del(&r_cfg, extack);
6b9ea5a6
RP		 5301 if (err)
5302 last_err = err;
5303
51ebd318
ND		 5304 rtnh = rtnh_next(rtnh, &remaining);
5305 }
5306
5307 return last_err;
5308}
5309
c21ef3e3
DA		 5310static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5311 struct netlink_ext_ack *extack)
1da177e4 5312{
86872cb5
TG		 5313 struct fib6_config cfg;
5314 int err;
1da177e4 5315
333c4301 5316 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 5317 if (err < 0)
5318 return err;
5319
5b98324e
DA		 5320 if (cfg.fc_nh_id &&
5321 !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) {
5322 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
5323 return -EINVAL;
5324 }
5325
51ebd318 5326 if (cfg.fc_mp)
333c4301 5327 return ip6_route_multipath_del(&cfg, extack);
0ae81335
DA		 5328 else {
5329 cfg.fc_delete_all_nh = 1;
333c4301 5330 return ip6_route_del(&cfg, extack);
0ae81335 5331 }
1da177e4
LT		 5332}
5333
c21ef3e3
DA		 5334static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5335 struct netlink_ext_ack *extack)
1da177e4 5336{
86872cb5
TG		 5337 struct fib6_config cfg;
5338 int err;
1da177e4 5339
333c4301 5340 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 5341 if (err < 0)
5342 return err;
5343
67f69513
DA		 5344 if (cfg.fc_metric == 0)
5345 cfg.fc_metric = IP6_RT_PRIO_USER;
5346
51ebd318 5347 if (cfg.fc_mp)
333c4301 5348 return ip6_route_multipath_add(&cfg, extack);
51ebd318 5349 else
acb54e3c 5350 return ip6_route_add(&cfg, GFP_KERNEL, extack);
1da177e4
LT		 5351}
5352
a1b7a1f0
DA		 5353/* add the overhead of this fib6_nh to nexthop_len */
5354static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg)
339bf98f 5355{
a1b7a1f0 5356 int *nexthop_len = arg;
beb1afac 5357
a1b7a1f0
DA		 5358 *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */
5359 + NLA_ALIGN(sizeof(struct rtnexthop))
5360 + nla_total_size(16); /* RTA_GATEWAY */
5361
5362 if (nh->fib_nh_lws) {
5363 /* RTA_ENCAP_TYPE */
5364 *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5365 /* RTA_ENCAP */
5366 *nexthop_len += nla_total_size(2);
5367 }
f88d8ea6 5368
a1b7a1f0
DA		 5369 return 0;
5370}
beb1afac 5371
a1b7a1f0
DA		 5372static size_t rt6_nlmsg_size(struct fib6_info *f6i)
5373{
5374 int nexthop_len;
5375
5376 if (f6i->nh) {
5377 nexthop_len = nla_total_size(4); /* RTA_NH_ID */
5378 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size,
5379 &nexthop_len);
5380 } else {
5381 struct fib6_nh *nh = f6i->fib6_nh;
5382
5383 nexthop_len = 0;
5384 if (f6i->fib6_nsiblings) {
5385 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
5386 + NLA_ALIGN(sizeof(struct rtnexthop))
5387 + nla_total_size(16) /* RTA_GATEWAY */
5388 + lwtunnel_get_encap_size(nh->fib_nh_lws);
5389
5390 nexthop_len *= f6i->fib6_nsiblings;
5391 }
5392 nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
beb1afac
DA		 5393 }
5394
339bf98f
TG		 5395 return NLMSG_ALIGN(sizeof(struct rtmsg))
5396 + nla_total_size(16) /* RTA_SRC */
5397 + nla_total_size(16) /* RTA_DST */
5398 + nla_total_size(16) /* RTA_GATEWAY */
5399 + nla_total_size(16) /* RTA_PREFSRC */
5400 + nla_total_size(4) /* RTA_TABLE */
5401 + nla_total_size(4) /* RTA_IIF */
5402 + nla_total_size(4) /* RTA_OIF */
5403 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 5404 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 5405 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 5406 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 5407 + nla_total_size(1) /* RTA_PREF */
beb1afac
DA		 5408 + nexthop_len;
5409}
5410
f88d8ea6
DA		 5411static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh,
5412 unsigned char *flags)
5413{
5414 if (nexthop_is_multipath(nh)) {
5415 struct nlattr *mp;
5416
4255ff05 5417 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
f88d8ea6
DA		 5418 if (!mp)
5419 goto nla_put_failure;
5420
7bdf4de1 5421 if (nexthop_mpath_fill_node(skb, nh, AF_INET6))
f88d8ea6
DA		 5422 goto nla_put_failure;
5423
5424 nla_nest_end(skb, mp);
5425 } else {
5426 struct fib6_nh *fib6_nh;
5427
5428 fib6_nh = nexthop_fib6_nh(nh);
7bdf4de1 5429 if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6,
f88d8ea6
DA		 5430 flags, false) < 0)
5431 goto nla_put_failure;
5432 }
5433
5434 return 0;
5435
5436nla_put_failure:
5437 return -EMSGSIZE;
5438}
5439
d4ead6b3 5440static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 5441 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 5442 struct in6_addr *dest, struct in6_addr *src,
15e47304 5443 int iif, int type, u32 portid, u32 seq,
f8cfe2ce 5444 unsigned int flags)
1da177e4 5445{
22d0bd82
XL		 5446 struct rt6_info *rt6 = (struct rt6_info *)dst;
5447 struct rt6key *rt6_dst, *rt6_src;
5448 u32 *pmetrics, table, rt6_flags;
f88d8ea6 5449 unsigned char nh_flags = 0;
2d7202bf 5450 struct nlmsghdr *nlh;
22d0bd82 5451 struct rtmsg *rtm;
d4ead6b3 5452 long expires = 0;
1da177e4 5453
15e47304 5454 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 5455 if (!nlh)
26932566 5456 return -EMSGSIZE;
2d7202bf 5457
22d0bd82
XL		 5458 if (rt6) {
5459 rt6_dst = &rt6->rt6i_dst;
5460 rt6_src = &rt6->rt6i_src;
5461 rt6_flags = rt6->rt6i_flags;
5462 } else {
5463 rt6_dst = &rt->fib6_dst;
5464 rt6_src = &rt->fib6_src;
5465 rt6_flags = rt->fib6_flags;
5466 }
5467
2d7202bf 5468 rtm = nlmsg_data(nlh);
1da177e4 5469 rtm->rtm_family = AF_INET6;
22d0bd82
XL		 5470 rtm->rtm_dst_len = rt6_dst->plen;
5471 rtm->rtm_src_len = rt6_src->plen;
1da177e4 5472 rtm->rtm_tos = 0;
93c2fb25
DA		 5473 if (rt->fib6_table)
5474 table = rt->fib6_table->tb6_id;
c71099ac 5475 else
9e762a4a 5476 table = RT6_TABLE_UNSPEC;
97f0082a 5477 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
c78679e8
DM		 5478 if (nla_put_u32(skb, RTA_TABLE, table))
5479 goto nla_put_failure;
e8478e80
DA		 5480
5481 rtm->rtm_type = rt->fib6_type;
1da177e4
LT		 5482 rtm->rtm_flags = 0;
5483 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
93c2fb25 5484 rtm->rtm_protocol = rt->fib6_protocol;
1da177e4 5485
22d0bd82 5486 if (rt6_flags & RTF_CACHE)
1da177e4
LT		 5487 rtm->rtm_flags |= RTM_F_CLONED;
5488
d4ead6b3
DA		 5489 if (dest) {
5490 if (nla_put_in6_addr(skb, RTA_DST, dest))
c78679e8 5491 goto nla_put_failure;
1ab1457c 5492 rtm->rtm_dst_len = 128;
1da177e4 5493 } else if (rtm->rtm_dst_len)
22d0bd82 5494 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
c78679e8 5495 goto nla_put_failure;
1da177e4
LT		 5496#ifdef CONFIG_IPV6_SUBTREES
5497 if (src) {
930345ea 5498 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 5499 goto nla_put_failure;
1ab1457c 5500 rtm->rtm_src_len = 128;
c78679e8 5501 } else if (rtm->rtm_src_len &&
22d0bd82 5502 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
c78679e8 5503 goto nla_put_failure;
1da177e4 5504#endif
7bc570c8
YH		 5505 if (iif) {
5506#ifdef CONFIG_IPV6_MROUTE
22d0bd82 5507 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
fd61c6ba
DA		 5508 int err = ip6mr_get_route(net, skb, rtm, portid);
5509
5510 if (err == 0)
5511 return 0;
5512 if (err < 0)
5513 goto nla_put_failure;
7bc570c8
YH		 5514 } else
5515#endif
c78679e8
DM		 5516 if (nla_put_u32(skb, RTA_IIF, iif))
5517 goto nla_put_failure;
d4ead6b3 5518 } else if (dest) {
1da177e4 5519 struct in6_addr saddr_buf;
d4ead6b3 5520 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
930345ea 5521 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 5522 goto nla_put_failure;
1da177e4 5523 }
2d7202bf 5524
93c2fb25 5525 if (rt->fib6_prefsrc.plen) {
c3968a85 5526 struct in6_addr saddr_buf;
93c2fb25 5527 saddr_buf = rt->fib6_prefsrc.addr;
930345ea 5528 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 5529 goto nla_put_failure;
c3968a85
DW		 5530 }
5531
d4ead6b3
DA		 5532 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
5533 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
2d7202bf
TG		 5534 goto nla_put_failure;
5535
93c2fb25 5536 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
c78679e8 5537 goto nla_put_failure;
8253947e 5538
beb1afac
DA		 5539 /* For multipath routes, walk the siblings list and add
5540 * each as a nexthop within RTA_MULTIPATH.
5541 */
22d0bd82
XL		 5542 if (rt6) {
5543 if (rt6_flags & RTF_GATEWAY &&
5544 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
5545 goto nla_put_failure;
5546
5547 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
5548 goto nla_put_failure;
6b13d8f7
OH		 5549
5550 if (dst->lwtstate &&
5551 lwtunnel_fill_encap(skb, dst->lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0)
5552 goto nla_put_failure;
22d0bd82 5553 } else if (rt->fib6_nsiblings) {
8d1c802b 5554 struct fib6_info *sibling, *next_sibling;
beb1afac
DA		 5555 struct nlattr *mp;
5556
ae0be8de 5557 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
beb1afac
DA		 5558 if (!mp)
5559 goto nla_put_failure;
5560
1cf844c7 5561 if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common,
7bdf4de1 5562 rt->fib6_nh->fib_nh_weight, AF_INET6) < 0)
beb1afac
DA		 5563 goto nla_put_failure;
5564
5565 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25 5566 &rt->fib6_siblings, fib6_siblings) {
1cf844c7 5567 if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common,
7bdf4de1
DS		 5568 sibling->fib6_nh->fib_nh_weight,
5569 AF_INET6) < 0)
beb1afac
DA		 5570 goto nla_put_failure;
5571 }
5572
5573 nla_nest_end(skb, mp);
f88d8ea6
DA		 5574 } else if (rt->nh) {
5575 if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id))
5576 goto nla_put_failure;
ecc5663c 5577
f88d8ea6
DA		 5578 if (nexthop_is_blackhole(rt->nh))
5579 rtm->rtm_type = RTN_BLACKHOLE;
5580
4f80116d
RP		 5581 if (net->ipv4.sysctl_nexthop_compat_mode &&
5582 rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
f88d8ea6
DA		 5583 goto nla_put_failure;
5584
5585 rtm->rtm_flags |= nh_flags;
5586 } else {
7bdf4de1 5587 if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6,
ecc5663c 5588 &nh_flags, false) < 0)
beb1afac 5589 goto nla_put_failure;
ecc5663c
DA		 5590
5591 rtm->rtm_flags |= nh_flags;
beb1afac
DA		 5592 }
5593
22d0bd82 5594 if (rt6_flags & RTF_EXPIRES) {
14895687
DA		 5595 expires = dst ? dst->expires : rt->expires;
5596 expires -= jiffies;
5597 }
69cdf8f9 5598
bb3c4ab9
IS		 5599 if (!dst) {
5600 if (rt->offload)
5601 rtm->rtm_flags |= RTM_F_OFFLOAD;
5602 if (rt->trap)
5603 rtm->rtm_flags |= RTM_F_TRAP;
0c5fcf9e
AC		 5604 if (rt->offload_failed)
5605 rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED;
bb3c4ab9
IS		 5606 }
5607
d4ead6b3 5608 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
e3703b3d 5609 goto nla_put_failure;
2d7202bf 5610
22d0bd82 5611 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
c78ba6d6
LR		 5612 goto nla_put_failure;
5613
19e42e45 5614
053c095a
JB		 5615 nlmsg_end(skb, nlh);
5616 return 0;
2d7202bf
TG		 5617
5618nla_put_failure:
26932566
PM		 5619 nlmsg_cancel(skb, nlh);
5620 return -EMSGSIZE;
1da177e4
LT		 5621}
5622
2c170e07
DA		 5623static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
5624{
5625 const struct net_device *dev = arg;
5626
5627 if (nh->fib_nh_dev == dev)
5628 return 1;
5629
5630 return 0;
5631}
5632
13e38901
DA		 5633static bool fib6_info_uses_dev(const struct fib6_info *f6i,
5634 const struct net_device *dev)
5635{
2c170e07
DA		 5636 if (f6i->nh) {
5637 struct net_device *_dev = (struct net_device *)dev;
5638
5639 return !!nexthop_for_each_fib6_nh(f6i->nh,
5640 fib6_info_nh_uses_dev,
5641 _dev);
5642 }
5643
1cf844c7 5644 if (f6i->fib6_nh->fib_nh_dev == dev)
13e38901
DA		 5645 return true;
5646
5647 if (f6i->fib6_nsiblings) {
5648 struct fib6_info *sibling, *next_sibling;
5649
5650 list_for_each_entry_safe(sibling, next_sibling,
5651 &f6i->fib6_siblings, fib6_siblings) {
1cf844c7 5652 if (sibling->fib6_nh->fib_nh_dev == dev)
13e38901
DA		 5653 return true;
5654 }
5655 }
5656
5657 return false;
5658}
5659
1e47b483
SB		 5660struct fib6_nh_exception_dump_walker {
5661 struct rt6_rtnl_dump_arg *dump;
5662 struct fib6_info *rt;
5663 unsigned int flags;
5664 unsigned int skip;
5665 unsigned int count;
5666};
5667
5668static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
5669{
5670 struct fib6_nh_exception_dump_walker *w = arg;
5671 struct rt6_rtnl_dump_arg *dump = w->dump;
5672 struct rt6_exception_bucket *bucket;
5673 struct rt6_exception *rt6_ex;
5674 int i, err;
5675
5676 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
5677 if (!bucket)
5678 return 0;
5679
5680 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
5681 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
5682 if (w->skip) {
5683 w->skip--;
5684 continue;
5685 }
5686
5687 /* Expiration of entries doesn't bump sernum, insertion
5688 * does. Removal is triggered by insertion, so we can
5689 * rely on the fact that if entries change between two
5690 * partial dumps, this node is scanned again completely,
5691 * see rt6_insert_exception() and fib6_dump_table().
5692 *
5693 * Count expired entries we go through as handled
5694 * entries that we'll skip next time, in case of partial
5695 * node dump. Otherwise, if entries expire meanwhile,
5696 * we'll skip the wrong amount.
5697 */
5698 if (rt6_check_expired(rt6_ex->rt6i)) {
5699 w->count++;
5700 continue;
5701 }
5702
5703 err = rt6_fill_node(dump->net, dump->skb, w->rt,
5704 &rt6_ex->rt6i->dst, NULL, NULL, 0,
5705 RTM_NEWROUTE,
5706 NETLINK_CB(dump->cb->skb).portid,
5707 dump->cb->nlh->nlmsg_seq, w->flags);
5708 if (err)
5709 return err;
5710
5711 w->count++;
5712 }
5713 bucket++;
5714 }
5715
5716 return 0;
5717}
5718
bf9a8a06 5719/* Return -1 if done with node, number of handled routes on partial dump */
1e47b483 5720int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
1da177e4
LT		 5721{
5722 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
13e38901
DA		 5723 struct fib_dump_filter *filter = &arg->filter;
5724 unsigned int flags = NLM_F_MULTI;
1f17e2f2 5725 struct net *net = arg->net;
1e47b483 5726 int count = 0;
1f17e2f2 5727
421842ed 5728 if (rt == net->ipv6.fib6_null_entry)
bf9a8a06 5729 return -1;
1da177e4 5730
13e38901
DA		 5731 if ((filter->flags & RTM_F_PREFIX) &&
5732 !(rt->fib6_flags & RTF_PREFIX_RT)) {
5733 /* success since this is not a prefix route */
bf9a8a06 5734 return -1;
13e38901 5735 }
1e47b483
SB		 5736 if (filter->filter_set &&
5737 ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
5738 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
5739 (filter->protocol && rt->fib6_protocol != filter->protocol))) {
5740 return -1;
5741 }
5742
5743 if (filter->filter_set ||
5744 !filter->dump_routes || !filter->dump_exceptions) {
13e38901 5745 flags |= NLM_F_DUMP_FILTERED;
f8cfe2ce 5746 }
1da177e4 5747
1e47b483
SB		 5748 if (filter->dump_routes) {
5749 if (skip) {
5750 skip--;
5751 } else {
5752 if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
5753 0, RTM_NEWROUTE,
5754 NETLINK_CB(arg->cb->skb).portid,
5755 arg->cb->nlh->nlmsg_seq, flags)) {
5756 return 0;
5757 }
5758 count++;
5759 }
5760 }
5761
5762 if (filter->dump_exceptions) {
5763 struct fib6_nh_exception_dump_walker w = { .dump = arg,
5764 .rt = rt,
5765 .flags = flags,
5766 .skip = skip,
5767 .count = 0 };
5768 int err;
5769
3b525691 5770 rcu_read_lock();
1e47b483
SB		 5771 if (rt->nh) {
5772 err = nexthop_for_each_fib6_nh(rt->nh,
5773 rt6_nh_dump_exceptions,
5774 &w);
5775 } else {
5776 err = rt6_nh_dump_exceptions(rt->fib6_nh, &w);
5777 }
3b525691 5778 rcu_read_unlock();
1e47b483
SB		 5779
5780 if (err)
5781 return count += w.count;
5782 }
bf9a8a06
SB		 5783
5784 return -1;
1da177e4
LT		 5785}
5786
0eff0a27
JK		 5787static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
5788 const struct nlmsghdr *nlh,
5789 struct nlattr **tb,
5790 struct netlink_ext_ack *extack)
5791{
5792 struct rtmsg *rtm;
5793 int i, err;
5794
5795 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
5796 NL_SET_ERR_MSG_MOD(extack,
5797 "Invalid header for get route request");
5798 return -EINVAL;
5799 }
5800
5801 if (!netlink_strict_get_check(skb))
8cb08174
JB		 5802 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5803 rtm_ipv6_policy, extack);
0eff0a27
JK		 5804
5805 rtm = nlmsg_data(nlh);
5806 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
5807 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
5808 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
5809 rtm->rtm_type) {
5810 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
5811 return -EINVAL;
5812 }
5813 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
5814 NL_SET_ERR_MSG_MOD(extack,
5815 "Invalid flags for get route request");
5816 return -EINVAL;
5817 }
5818
8cb08174
JB		 5819 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
5820 rtm_ipv6_policy, extack);
0eff0a27
JK		 5821 if (err)
5822 return err;
5823
5824 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
5825 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
5826 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
5827 return -EINVAL;
5828 }
5829
5830 for (i = 0; i <= RTA_MAX; i++) {
5831 if (!tb[i])
5832 continue;
5833
5834 switch (i) {
5835 case RTA_SRC:
5836 case RTA_DST:
5837 case RTA_IIF:
5838 case RTA_OIF:
5839 case RTA_MARK:
5840 case RTA_UID:
5841 case RTA_SPORT:
5842 case RTA_DPORT:
5843 case RTA_IP_PROTO:
5844 break;
5845 default:
5846 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
5847 return -EINVAL;
5848 }
5849 }
5850
5851 return 0;
5852}
5853
c21ef3e3
DA		 5854static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5855 struct netlink_ext_ack *extack)
1da177e4 5856{
3b1e0a65 5857 struct net *net = sock_net(in_skb->sk);
ab364a6f 5858 struct nlattr *tb[RTA_MAX+1];
18c3a61c 5859 int err, iif = 0, oif = 0;
a68886a6 5860 struct fib6_info *from;
18c3a61c 5861 struct dst_entry *dst;
ab364a6f 5862 struct rt6_info *rt;
1da177e4 5863 struct sk_buff *skb;
ab364a6f 5864 struct rtmsg *rtm;
744486d4 5865 struct flowi6 fl6 = {};
18c3a61c 5866 bool fibmatch;
1da177e4 5867
0eff0a27 5868 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
ab364a6f
TG		 5869 if (err < 0)
5870 goto errout;
1da177e4 5871
ab364a6f 5872 err = -EINVAL;
38b7097b
HFS		 5873 rtm = nlmsg_data(nlh);
5874 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
18c3a61c 5875 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
1da177e4 5876
ab364a6f
TG		 5877 if (tb[RTA_SRC]) {
5878 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
5879 goto errout;
5880
4e3fd7a0 5881 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 5882 }
5883
5884 if (tb[RTA_DST]) {
5885 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
5886 goto errout;
5887
4e3fd7a0 5888 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 5889 }
5890
5891 if (tb[RTA_IIF])
5892 iif = nla_get_u32(tb[RTA_IIF]);
5893
5894 if (tb[RTA_OIF])
72331bc0 5895 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 5896
2e47b291
LC		 5897 if (tb[RTA_MARK])
5898 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
5899
622ec2c9
LC		 5900 if (tb[RTA_UID])
5901 fl6.flowi6_uid = make_kuid(current_user_ns(),
5902 nla_get_u32(tb[RTA_UID]));
5903 else
5904 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
5905
eacb9384
RP		 5906 if (tb[RTA_SPORT])
5907 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
5908
5909 if (tb[RTA_DPORT])
5910 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
5911
5912 if (tb[RTA_IP_PROTO]) {
5913 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
5e1a99ea
HL		 5914 &fl6.flowi6_proto, AF_INET6,
5915 extack);
eacb9384
RP		 5916 if (err)
5917 goto errout;
5918 }
5919
1da177e4
LT		 5920 if (iif) {
5921 struct net_device *dev;
72331bc0
SL		 5922 int flags = 0;
5923
121622db
FW		 5924 rcu_read_lock();
5925
5926 dev = dev_get_by_index_rcu(net, iif);
1da177e4 5927 if (!dev) {
121622db 5928 rcu_read_unlock();
1da177e4 5929 err = -ENODEV;
ab364a6f 5930 goto errout;
1da177e4 5931 }
72331bc0
SL		 5932
5933 fl6.flowi6_iif = iif;
5934
5935 if (!ipv6_addr_any(&fl6.saddr))
5936 flags |= RT6_LOOKUP_F_HAS_SADDR;
5937
b75cc8f9 5938 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
121622db
FW		 5939
5940 rcu_read_unlock();
72331bc0
SL		 5941 } else {
5942 fl6.flowi6_oif = oif;
5943
58acfd71 5944 dst = ip6_route_output(net, NULL, &fl6);
18c3a61c
RP		 5945 }
5946
18c3a61c
RP		 5947
5948 rt = container_of(dst, struct rt6_info, dst);
5949 if (rt->dst.error) {
5950 err = rt->dst.error;
5951 ip6_rt_put(rt);
5952 goto errout;
1da177e4
LT		 5953 }
5954
9d6acb3b
WC		 5955 if (rt == net->ipv6.ip6_null_entry) {
5956 err = rt->dst.error;
5957 ip6_rt_put(rt);
5958 goto errout;
5959 }
5960
ab364a6f 5961 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 5962 if (!skb) {
94e187c0 5963 ip6_rt_put(rt);
ab364a6f
TG		 5964 err = -ENOBUFS;
5965 goto errout;
5966 }
1da177e4 5967
d8d1f30b 5968 skb_dst_set(skb, &rt->dst);
a68886a6
DA		 5969
5970 rcu_read_lock();
5971 from = rcu_dereference(rt->from);
886b7a50
MKL		 5972 if (from) {
5973 if (fibmatch)
5974 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
5975 iif, RTM_NEWROUTE,
5976 NETLINK_CB(in_skb).portid,
5977 nlh->nlmsg_seq, 0);
5978 else
5979 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
5980 &fl6.saddr, iif, RTM_NEWROUTE,
5981 NETLINK_CB(in_skb).portid,
5982 nlh->nlmsg_seq, 0);
5983 } else {
5984 err = -ENETUNREACH;
5985 }
a68886a6
DA		 5986 rcu_read_unlock();
5987
1da177e4 5988 if (err < 0) {
ab364a6f
TG		 5989 kfree_skb(skb);
5990 goto errout;
1da177e4
LT		 5991 }
5992
15e47304 5993 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 5994errout:
1da177e4 5995 return err;
1da177e4
LT		 5996}
5997
8d1c802b 5998void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
37a1d361 5999 unsigned int nlm_flags)
1da177e4
LT		 6000{
6001 struct sk_buff *skb;
5578689a 6002 struct net *net = info->nl_net;
528c4ceb
DL		 6003 u32 seq;
6004 int err;
6005
6006 err = -ENOBUFS;
38308473 6007 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 6008
19e42e45 6009 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 6010 if (!skb)
21713ebc
TG		 6011 goto errout;
6012
d4ead6b3
DA		 6013 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6014 event, info->portid, seq, nlm_flags);
26932566
PM		 6015 if (err < 0) {
6016 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6017 WARN_ON(err == -EMSGSIZE);
6018 kfree_skb(skb);
6019 goto errout;
6020 }
15e47304 6021 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 6022 info->nlh, gfp_any());
6023 return;
21713ebc
TG		 6024errout:
6025 if (err < 0)
5578689a 6026 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 6027}
6028
19a3b7ee
DA		 6029void fib6_rt_update(struct net *net, struct fib6_info *rt,
6030 struct nl_info *info)
6031{
6032 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6033 struct sk_buff *skb;
6034 int err = -ENOBUFS;
6035
19a3b7ee
DA		 6036 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6037 if (!skb)
6038 goto errout;
6039
6040 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6041 RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
6042 if (err < 0) {
6043 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6044 WARN_ON(err == -EMSGSIZE);
6045 kfree_skb(skb);
6046 goto errout;
6047 }
6048 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6049 info->nlh, gfp_any());
6050 return;
6051errout:
6052 if (err < 0)
6053 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6054}
6055
907eea48 6056void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
0c5fcf9e 6057 bool offload, bool trap, bool offload_failed)
907eea48
AC		 6058{
6059 struct sk_buff *skb;
6060 int err;
6061
0c5fcf9e
AC		 6062 if (f6i->offload == offload && f6i->trap == trap &&
6063 f6i->offload_failed == offload_failed)
907eea48
AC		 6064 return;
6065
6066 f6i->offload = offload;
6067 f6i->trap = trap;
6fad361a
AC		 6068
6069 /* 2 means send notifications only if offload_failed was changed. */
6070 if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 &&
6071 f6i->offload_failed == offload_failed)
6072 return;
6073
0c5fcf9e 6074 f6i->offload_failed = offload_failed;
907eea48
AC		 6075
6076 if (!rcu_access_pointer(f6i->fib6_node))
6077 /* The route was removed from the tree, do not send
6078 * notfication.
6079 */
6080 return;
6081
6082 if (!net->ipv6.sysctl.fib_notify_on_flag_change)
6083 return;
6084
6085 skb = nlmsg_new(rt6_nlmsg_size(f6i), GFP_KERNEL);
6086 if (!skb) {
6087 err = -ENOBUFS;
6088 goto errout;
6089 }
6090
6091 err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0,
6092 0, 0);
6093 if (err < 0) {
6094 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6095 WARN_ON(err == -EMSGSIZE);
6096 kfree_skb(skb);
6097 goto errout;
6098 }
6099
6100 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_ROUTE, NULL, GFP_KERNEL);
6101 return;
6102
6103errout:
6104 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6105}
6106EXPORT_SYMBOL(fib6_info_hw_flags_set);
6107
8ed67789 6108static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 6109 unsigned long event, void *ptr)
8ed67789 6110{
351638e7 6111 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 6112 struct net *net = dev_net(dev);
8ed67789 6113
242d3a49
WC		 6114 if (!(dev->flags & IFF_LOOPBACK))
6115 return NOTIFY_OK;
6116
6117 if (event == NETDEV_REGISTER) {
1cf844c7 6118 net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev;
d8d1f30b 6119 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 6120 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
6121#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 6122 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 6123 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 6124 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789 6125 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
242d3a49 6126#endif
76da0704
WC		 6127 } else if (event == NETDEV_UNREGISTER &&
6128 dev->reg_state != NETREG_UNREGISTERED) {
6129 /* NETDEV_UNREGISTER could be fired for multiple times by
6130 * netdev_wait_allrefs(). Make sure we only call this once.
6131 */
12d94a80 6132 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
242d3a49 6133#ifdef CONFIG_IPV6_MULTIPLE_TABLES
12d94a80
ED		 6134 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
6135 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
8ed67789
DL		 6136#endif
6137 }
6138
6139 return NOTIFY_OK;
6140}
6141
1da177e4
LT		 6142/*
6143 * /proc
6144 */
6145
6146#ifdef CONFIG_PROC_FS
1da177e4
LT		 6147static int rt6_stats_seq_show(struct seq_file *seq, void *v)
6148{
69ddb805 6149 struct net *net = (struct net *)seq->private;
1da177e4 6150 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 6151 net->ipv6.rt6_stats->fib_nodes,
6152 net->ipv6.rt6_stats->fib_route_nodes,
81eb8447 6153 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
69ddb805
DL		 6154 net->ipv6.rt6_stats->fib_rt_entries,
6155 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 6156 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 6157 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 6158
6159 return 0;
6160}
1da177e4
LT		 6161#endif /* CONFIG_PROC_FS */
6162
6163#ifdef CONFIG_SYSCTL
6164
32927393
CH		 6165static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
6166 void *buffer, size_t *lenp, loff_t *ppos)
1da177e4 6167{
c486da34
LAG		 6168 struct net *net;
6169 int delay;
f0fb9b28 6170 int ret;
c486da34 6171 if (!write)
1da177e4 6172 return -EINVAL;
c486da34
LAG		 6173
6174 net = (struct net *)ctl->extra1;
6175 delay = net->ipv6.sysctl.flush_delay;
f0fb9b28
AP		 6176 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6177 if (ret)
6178 return ret;
6179
2ac3ac8f 6180 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 6181 return 0;
1da177e4
LT		 6182}
6183
ed792e28 6184static struct ctl_table ipv6_route_table_template[] = {
1ab1457c 6185 {
1da177e4 6186 .procname = "flush",
4990509f 6187 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 6188 .maxlen = sizeof(int),
89c8b3a1 6189 .mode = 0200,
6d9f239a 6190 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 6191 },
6192 {
1da177e4 6193 .procname = "gc_thresh",
9a7ec3a9 6194 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 6195 .maxlen = sizeof(int),
6196 .mode = 0644,
6d9f239a 6197 .proc_handler = proc_dointvec,
1da177e4
LT		 6198 },
6199 {
1da177e4 6200 .procname = "max_size",
4990509f 6201 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 6202 .maxlen = sizeof(int),
6203 .mode = 0644,
6d9f239a 6204 .proc_handler = proc_dointvec,
1da177e4
LT		 6205 },
6206 {
1da177e4 6207 .procname = "gc_min_interval",
4990509f 6208 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 6209 .maxlen = sizeof(int),
6210 .mode = 0644,
6d9f239a 6211 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6212 },
6213 {
1da177e4 6214 .procname = "gc_timeout",
4990509f 6215 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 6216 .maxlen = sizeof(int),
6217 .mode = 0644,
6d9f239a 6218 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6219 },
6220 {
1da177e4 6221 .procname = "gc_interval",
4990509f 6222 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 6223 .maxlen = sizeof(int),
6224 .mode = 0644,
6d9f239a 6225 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6226 },
6227 {
1da177e4 6228 .procname = "gc_elasticity",
4990509f 6229 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 6230 .maxlen = sizeof(int),
6231 .mode = 0644,
f3d3f616 6232 .proc_handler = proc_dointvec,
1da177e4
LT		 6233 },
6234 {
1da177e4 6235 .procname = "mtu_expires",
4990509f 6236 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 6237 .maxlen = sizeof(int),
6238 .mode = 0644,
6d9f239a 6239 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6240 },
6241 {
1da177e4 6242 .procname = "min_adv_mss",
4990509f 6243 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 6244 .maxlen = sizeof(int),
6245 .mode = 0644,
f3d3f616 6246 .proc_handler = proc_dointvec,
1da177e4
LT		 6247 },
6248 {
1da177e4 6249 .procname = "gc_min_interval_ms",
4990509f 6250 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 6251 .maxlen = sizeof(int),
6252 .mode = 0644,
6d9f239a 6253 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 6254 },
7c6bb7d2
DA		 6255 {
6256 .procname = "skip_notify_on_dev_down",
6257 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
6258 .maxlen = sizeof(int),
6259 .mode = 0644,
b8e8a863 6260 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 6261 .extra1 = SYSCTL_ZERO,
6262 .extra2 = SYSCTL_ONE,
7c6bb7d2 6263 },
f8572d8f 6264 { }
1da177e4
LT		 6265};
6266
2c8c1e72 6267struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 6268{
6269 struct ctl_table *table;
6270
6271 table = kmemdup(ipv6_route_table_template,
6272 sizeof(ipv6_route_table_template),
6273 GFP_KERNEL);
5ee09105
YH		 6274
6275 if (table) {
6276 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 6277 table[0].extra1 = net;
86393e52 6278 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 6279 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
6280 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6281 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
6282 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
6283 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
6284 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
6285 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 6286 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
7c6bb7d2 6287 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
464dc801
EB		 6288
6289 /* Don't export sysctls to unprivileged users */
6290 if (net->user_ns != &init_user_ns)
6291 table[0].procname = NULL;
5ee09105
YH		 6292 }
6293
760f2d01
DL		 6294 return table;
6295}
1da177e4
LT		 6296#endif
6297
2c8c1e72 6298static int __net_init ip6_route_net_init(struct net *net)
cdb18761 6299{
633d424b 6300 int ret = -ENOMEM;
8ed67789 6301
86393e52
AD		 6302 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
6303 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 6304
fc66f95c
ED		 6305 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
6306 goto out_ip6_dst_ops;
6307
1cf844c7 6308 net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true);
421842ed
DA		 6309 if (!net->ipv6.fib6_null_entry)
6310 goto out_ip6_dst_entries;
1cf844c7
DA		 6311 memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template,
6312 sizeof(*net->ipv6.fib6_null_entry));
421842ed 6313
8ed67789
DL		 6314 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
6315 sizeof(*net->ipv6.ip6_null_entry),
6316 GFP_KERNEL);
6317 if (!net->ipv6.ip6_null_entry)
421842ed 6318 goto out_fib6_null_entry;
d8d1f30b 6319 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6320 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
6321 ip6_template_metrics, true);
74109218 6322 INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached);
8ed67789
DL		 6323
6324#ifdef CONFIG_IPV6_MULTIPLE_TABLES
feca7d8c 6325 net->ipv6.fib6_has_custom_rules = false;
8ed67789
DL		 6326 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
6327 sizeof(*net->ipv6.ip6_prohibit_entry),
6328 GFP_KERNEL);
68fffc67
PZ		 6329 if (!net->ipv6.ip6_prohibit_entry)
6330 goto out_ip6_null_entry;
d8d1f30b 6331 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6332 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
6333 ip6_template_metrics, true);
74109218 6334 INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached);
8ed67789
DL		 6335
6336 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
6337 sizeof(*net->ipv6.ip6_blk_hole_entry),
6338 GFP_KERNEL);
68fffc67
PZ		 6339 if (!net->ipv6.ip6_blk_hole_entry)
6340 goto out_ip6_prohibit_entry;
d8d1f30b 6341 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6342 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
6343 ip6_template_metrics, true);
74109218 6344 INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
b9b33e7c
PA		 6345#ifdef CONFIG_IPV6_SUBTREES
6346 net->ipv6.fib6_routes_require_src = 0;
6347#endif
8ed67789
DL		 6348#endif
6349
b339a47c
PZ		 6350 net->ipv6.sysctl.flush_delay = 0;
6351 net->ipv6.sysctl.ip6_rt_max_size = 4096;
6352 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
6353 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
6354 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
6355 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
6356 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
6357 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
7c6bb7d2 6358 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
b339a47c 6359
6891a346
BT		 6360 net->ipv6.ip6_rt_gc_expire = 30*HZ;
6361
8ed67789
DL		 6362 ret = 0;
6363out:
6364 return ret;
f2fc6a54 6365
68fffc67
PZ		 6366#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6367out_ip6_prohibit_entry:
6368 kfree(net->ipv6.ip6_prohibit_entry);
6369out_ip6_null_entry:
6370 kfree(net->ipv6.ip6_null_entry);
6371#endif
421842ed
DA		 6372out_fib6_null_entry:
6373 kfree(net->ipv6.fib6_null_entry);
fc66f95c
ED		 6374out_ip6_dst_entries:
6375 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 6376out_ip6_dst_ops:
f2fc6a54 6377 goto out;
cdb18761
DL		 6378}
6379
2c8c1e72 6380static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 6381{
421842ed 6382 kfree(net->ipv6.fib6_null_entry);
8ed67789
DL		 6383 kfree(net->ipv6.ip6_null_entry);
6384#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6385 kfree(net->ipv6.ip6_prohibit_entry);
6386 kfree(net->ipv6.ip6_blk_hole_entry);
6387#endif
41bb78b4 6388 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 6389}
6390
d189634e
TG		 6391static int __net_init ip6_route_net_init_late(struct net *net)
6392{
6393#ifdef CONFIG_PROC_FS
c3506372
CH		 6394 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
6395 sizeof(struct ipv6_route_iter));
3617d949
CH		 6396 proc_create_net_single("rt6_stats", 0444, net->proc_net,
6397 rt6_stats_seq_show, NULL);
d189634e
TG		 6398#endif
6399 return 0;
6400}
6401
6402static void __net_exit ip6_route_net_exit_late(struct net *net)
6403{
6404#ifdef CONFIG_PROC_FS
ece31ffd
G		 6405 remove_proc_entry("ipv6_route", net->proc_net);
6406 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 6407#endif
6408}
6409
cdb18761
DL		 6410static struct pernet_operations ip6_route_net_ops = {
6411 .init = ip6_route_net_init,
6412 .exit = ip6_route_net_exit,
6413};
6414
c3426b47
DM		 6415static int __net_init ipv6_inetpeer_init(struct net *net)
6416{
6417 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
6418
6419 if (!bp)
6420 return -ENOMEM;
6421 inet_peer_base_init(bp);
6422 net->ipv6.peers = bp;
6423 return 0;
6424}
6425
6426static void __net_exit ipv6_inetpeer_exit(struct net *net)
6427{
6428 struct inet_peer_base *bp = net->ipv6.peers;
6429
6430 net->ipv6.peers = NULL;
56a6b248 6431 inetpeer_invalidate_tree(bp);
c3426b47
DM		 6432 kfree(bp);
6433}
6434
2b823f72 6435static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 6436 .init = ipv6_inetpeer_init,
6437 .exit = ipv6_inetpeer_exit,
6438};
6439
d189634e
TG		 6440static struct pernet_operations ip6_route_net_late_ops = {
6441 .init = ip6_route_net_init_late,
6442 .exit = ip6_route_net_exit_late,
6443};
6444
8ed67789
DL		 6445static struct notifier_block ip6_route_dev_notifier = {
6446 .notifier_call = ip6_route_dev_notify,
242d3a49 6447 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
8ed67789
DL		 6448};
6449
2f460933
WC		 6450void __init ip6_route_init_special_entries(void)
6451{
6452 /* Registering of the loopback is done before this portion of code,
6453 * the loopback reference in rt6_info will not be taken, do it
6454 * manually for init_net */
1cf844c7 6455 init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev;
2f460933
WC		 6456 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
6457 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6458 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6459 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
6460 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6461 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
6462 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6463 #endif
6464}
6465
138d0be3
YS		 6466#if IS_BUILTIN(CONFIG_IPV6)
6467#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6468DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
6469
951cf368
YS		 6470BTF_ID_LIST(btf_fib6_info_id)
6471BTF_ID(struct, fib6_info)
6472
14fc6bd6 6473static const struct bpf_iter_seq_info ipv6_route_seq_info = {
15172a46
YS		 6474 .seq_ops = &ipv6_route_seq_ops,
6475 .init_seq_private = bpf_iter_init_seq_net,
6476 .fini_seq_private = bpf_iter_fini_seq_net,
6477 .seq_priv_size = sizeof(struct ipv6_route_iter),
14fc6bd6
YS		 6478};
6479
6480static struct bpf_iter_reg ipv6_route_reg_info = {
6481 .target = "ipv6_route",
3c32cc1b
YS		 6482 .ctx_arg_info_size = 1,
6483 .ctx_arg_info = {
6484 { offsetof(struct bpf_iter__ipv6_route, rt),
6485 PTR_TO_BTF_ID_OR_NULL },
6486 },
14fc6bd6 6487 .seq_info = &ipv6_route_seq_info,
15172a46
YS		 6488};
6489
138d0be3
YS		 6490static int __init bpf_iter_register(void)
6491{
951cf368 6492 ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;
15172a46 6493 return bpf_iter_reg_target(&ipv6_route_reg_info);
138d0be3
YS		 6494}
6495
6496static void bpf_iter_unregister(void)
6497{
ab2ee4fc 6498 bpf_iter_unreg_target(&ipv6_route_reg_info);
138d0be3
YS		 6499}
6500#endif
6501#endif
6502
433d49c3 6503int __init ip6_route_init(void)
1da177e4 6504{
433d49c3 6505 int ret;
8d0b94af 6506 int cpu;
433d49c3 6507
9a7ec3a9
DL		 6508 ret = -ENOMEM;
6509 ip6_dst_ops_template.kmem_cachep =
e5d679f3 6510 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 6511 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 6512 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 6513 goto out;
14e50e57 6514
fc66f95c 6515 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 6516 if (ret)
bdb3289f 6517 goto out_kmem_cache;
bdb3289f 6518
c3426b47
DM		 6519 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
6520 if (ret)
e8803b6c 6521 goto out_dst_entries;
2a0c451a 6522
7e52b33b
DM		 6523 ret = register_pernet_subsys(&ip6_route_net_ops);
6524 if (ret)
6525 goto out_register_inetpeer;
c3426b47 6526
5dc121e9
AE		 6527 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
6528
e8803b6c 6529 ret = fib6_init();
433d49c3 6530 if (ret)
8ed67789 6531 goto out_register_subsys;
433d49c3 6532
433d49c3
DL		 6533 ret = xfrm6_init();
6534 if (ret)
e8803b6c 6535 goto out_fib6_init;
c35b7e72 6536
433d49c3
DL		 6537 ret = fib6_rules_init();
6538 if (ret)
6539 goto xfrm6_init;
7e5449c2 6540
d189634e
TG		 6541 ret = register_pernet_subsys(&ip6_route_net_late_ops);
6542 if (ret)
6543 goto fib6_rules_init;
6544
16feebcf
FW		 6545 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
6546 inet6_rtm_newroute, NULL, 0);
6547 if (ret < 0)
6548 goto out_register_late_subsys;
6549
6550 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
6551 inet6_rtm_delroute, NULL, 0);
6552 if (ret < 0)
6553 goto out_register_late_subsys;
6554
6555 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
6556 inet6_rtm_getroute, NULL,
6557 RTNL_FLAG_DOIT_UNLOCKED);
6558 if (ret < 0)
d189634e 6559 goto out_register_late_subsys;
c127ea2c 6560
8ed67789 6561 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 6562 if (ret)
d189634e 6563 goto out_register_late_subsys;
8ed67789 6564
138d0be3
YS		 6565#if IS_BUILTIN(CONFIG_IPV6)
6566#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6567 ret = bpf_iter_register();
6568 if (ret)
6569 goto out_register_late_subsys;
6570#endif
6571#endif
6572
8d0b94af
MKL		 6573 for_each_possible_cpu(cpu) {
6574 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
6575
6576 INIT_LIST_HEAD(&ul->head);
6577 spin_lock_init(&ul->lock);
6578 }
6579
433d49c3
DL		 6580out:
6581 return ret;
6582
d189634e 6583out_register_late_subsys:
16feebcf 6584 rtnl_unregister_all(PF_INET6);
d189634e 6585 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 6586fib6_rules_init:
433d49c3
DL		 6587 fib6_rules_cleanup();
6588xfrm6_init:
433d49c3 6589 xfrm6_fini();
2a0c451a
TG		 6590out_fib6_init:
6591 fib6_gc_cleanup();
8ed67789
DL		 6592out_register_subsys:
6593 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 6594out_register_inetpeer:
6595 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 6596out_dst_entries:
6597 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 6598out_kmem_cache:
f2fc6a54 6599 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 6600 goto out;
1da177e4
LT		 6601}
6602
6603void ip6_route_cleanup(void)
6604{
138d0be3
YS		 6605#if IS_BUILTIN(CONFIG_IPV6)
6606#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6607 bpf_iter_unregister();
6608#endif
6609#endif
8ed67789 6610 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 6611 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 6612 fib6_rules_cleanup();
1da177e4 6613 xfrm6_fini();
1da177e4 6614 fib6_gc_cleanup();
c3426b47 6615 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 6616 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 6617 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 6618 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 6619}
Linux 6.x block layer and io_uring tree(s)