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neighbour: annotate lockless accesses to n->nud_state
[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>
4785305c 44#include <linux/siphash.h>
457c4cbc 45#include <net/net_namespace.h>
1da177e4
LT		 46#include <net/snmp.h>
47#include <net/ipv6.h>
48#include <net/ip6_fib.h>
49#include <net/ip6_route.h>
50#include <net/ndisc.h>
51#include <net/addrconf.h>
52#include <net/tcp.h>
53#include <linux/rtnetlink.h>
54#include <net/dst.h>
904af04d 55#include <net/dst_metadata.h>
1da177e4 56#include <net/xfrm.h>
8d71740c 57#include <net/netevent.h>
21713ebc 58#include <net/netlink.h>
3c618c1d 59#include <net/rtnh.h>
19e42e45 60#include <net/lwtunnel.h>
904af04d 61#include <net/ip_tunnels.h>
ca254490 62#include <net/l3mdev.h>
eacb9384 63#include <net/ip.h>
7c0f6ba6 64#include <linux/uaccess.h>
951cf368 65#include <linux/btf_ids.h>
1da177e4
LT		 66
67#ifdef CONFIG_SYSCTL
68#include <linux/sysctl.h>
69#endif
70
30d444d3
DA		 71static int ip6_rt_type_to_error(u8 fib6_type);
72
73#define CREATE_TRACE_POINTS
74#include <trace/events/fib6.h>
75EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
76#undef CREATE_TRACE_POINTS
77
afc154e9 78enum rt6_nud_state {
7e980569
JB		 79 RT6_NUD_FAIL_HARD = -3,
80 RT6_NUD_FAIL_PROBE = -2,
81 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 82 RT6_NUD_SUCCEED = 1
83};
84
bbd807df
BV		 85INDIRECT_CALLABLE_SCOPE
86struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 87static unsigned int ip6_default_advmss(const struct dst_entry *dst);
f67fbeae
BV		 88INDIRECT_CALLABLE_SCOPE
89unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 90static struct dst_entry *ip6_negative_advice(struct dst_entry *);
91static void ip6_dst_destroy(struct dst_entry *);
92static void ip6_dst_ifdown(struct dst_entry *,
93 struct net_device *dev, int how);
af6d1034 94static void ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 95
96static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 97static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 98static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 99static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 100static void ip6_link_failure(struct sk_buff *skb);
6700c270 101static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
bd085ef6
HL		 102 struct sk_buff *skb, u32 mtu,
103 bool confirm_neigh);
6700c270
DM		 104static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
105 struct sk_buff *skb);
702cea56
DA		 106static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
107 int strict);
a1b7a1f0 108static size_t rt6_nlmsg_size(struct fib6_info *f6i);
d4ead6b3 109static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 110 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 111 struct in6_addr *dest, struct in6_addr *src,
16a16cd3
DA		 112 int iif, int type, u32 portid, u32 seq,
113 unsigned int flags);
7e4b5128 114static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
510e2ced
WW		 115 const struct in6_addr *daddr,
116 const struct in6_addr *saddr);
1da177e4 117
70ceb4f5 118#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 119static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 120 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 121 const struct in6_addr *gwaddr,
122 struct net_device *dev,
95c96174 123 unsigned int pref);
8d1c802b 124static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 125 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 126 const struct in6_addr *gwaddr,
127 struct net_device *dev);
70ceb4f5
YH		 128#endif
129
8d0b94af
MKL		 130struct uncached_list {
131 spinlock_t lock;
132 struct list_head head;
ba55ef81 133 struct list_head quarantine;
8d0b94af
MKL		 134};
135
136static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
137
510c321b 138void rt6_uncached_list_add(struct rt6_info *rt)
8d0b94af
MKL		 139{
140 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
141
8d0b94af
MKL		 142 rt->rt6i_uncached_list = ul;
143
144 spin_lock_bh(&ul->lock);
145 list_add_tail(&rt->rt6i_uncached, &ul->head);
146 spin_unlock_bh(&ul->lock);
147}
148
510c321b 149void rt6_uncached_list_del(struct rt6_info *rt)
8d0b94af
MKL		 150{
151 if (!list_empty(&rt->rt6i_uncached)) {
152 struct uncached_list *ul = rt->rt6i_uncached_list;
153
154 spin_lock_bh(&ul->lock);
ba55ef81 155 list_del_init(&rt->rt6i_uncached);
8d0b94af
MKL		 156 spin_unlock_bh(&ul->lock);
157 }
158}
159
e5f80fcf 160static void rt6_uncached_list_flush_dev(struct net_device *dev)
8d0b94af 161{
8d0b94af
MKL		 162 int cpu;
163
164 for_each_possible_cpu(cpu) {
165 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
ba55ef81
ED		 166 struct rt6_info *rt, *safe;
167
168 if (list_empty(&ul->head))
169 continue;
8d0b94af
MKL		 170
171 spin_lock_bh(&ul->lock);
ba55ef81 172 list_for_each_entry_safe(rt, safe, &ul->head, rt6i_uncached) {
8d0b94af
MKL		 173 struct inet6_dev *rt_idev = rt->rt6i_idev;
174 struct net_device *rt_dev = rt->dst.dev;
ba55ef81 175 bool handled = false;
8d0b94af 176
e332bc67 177 if (rt_idev->dev == dev) {
e5f80fcf 178 rt->rt6i_idev = in6_dev_get(blackhole_netdev);
8d0b94af 179 in6_dev_put(rt_idev);
ba55ef81 180 handled = true;
8d0b94af
MKL		 181 }
182
e332bc67 183 if (rt_dev == dev) {
8d7017fd 184 rt->dst.dev = blackhole_netdev;
d62607c3
JK		 185 netdev_ref_replace(rt_dev, blackhole_netdev,
186 &rt->dst.dev_tracker,
187 GFP_ATOMIC);
ba55ef81 188 handled = true;
8d0b94af 189 }
ba55ef81
ED		 190 if (handled)
191 list_move(&rt->rt6i_uncached,
192 &ul->quarantine);
8d0b94af
MKL		 193 }
194 spin_unlock_bh(&ul->lock);
195 }
196}
197
f8a1b43b 198static inline const void *choose_neigh_daddr(const struct in6_addr *p,
f894cbf8
DM		 199 struct sk_buff *skb,
200 const void *daddr)
39232973 201{
a7563f34 202 if (!ipv6_addr_any(p))
39232973 203 return (const void *) p;
f894cbf8
DM		 204 else if (skb)
205 return &ipv6_hdr(skb)->daddr;
39232973
DM		 206 return daddr;
207}
208
f8a1b43b
DA		 209struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
210 struct net_device *dev,
211 struct sk_buff *skb,
212 const void *daddr)
d3aaeb38 213{
39232973
DM		 214 struct neighbour *n;
215
f8a1b43b
DA		 216 daddr = choose_neigh_daddr(gw, skb, daddr);
217 n = __ipv6_neigh_lookup(dev, daddr);
f83c7790
DM		 218 if (n)
219 return n;
7adf3246
SB		 220
221 n = neigh_create(&nd_tbl, daddr, dev);
222 return IS_ERR(n) ? NULL : n;
f8a1b43b
DA		 223}
224
225static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
226 struct sk_buff *skb,
227 const void *daddr)
228{
229 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
230
2c6b55f4
ND		 231 return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),
232 dst->dev, skb, daddr);
f83c7790
DM		 233}
234
63fca65d
JA		 235static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
236{
237 struct net_device *dev = dst->dev;
238 struct rt6_info *rt = (struct rt6_info *)dst;
239
cbfd6891 240 daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr);
63fca65d
JA		 241 if (!daddr)
242 return;
243 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
244 return;
245 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
246 return;
247 __ipv6_confirm_neigh(dev, daddr);
248}
249
9a7ec3a9 250static struct dst_ops ip6_dst_ops_template = {
1da177e4 251 .family = AF_INET6,
1da177e4
LT		 252 .gc = ip6_dst_gc,
253 .gc_thresh = 1024,
254 .check = ip6_dst_check,
0dbaee3b 255 .default_advmss = ip6_default_advmss,
ebb762f2 256 .mtu = ip6_mtu,
d4ead6b3 257 .cow_metrics = dst_cow_metrics_generic,
1da177e4
LT		 258 .destroy = ip6_dst_destroy,
259 .ifdown = ip6_dst_ifdown,
260 .negative_advice = ip6_negative_advice,
261 .link_failure = ip6_link_failure,
262 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 263 .redirect = rt6_do_redirect,
9f8955cc 264 .local_out = __ip6_local_out,
f8a1b43b 265 .neigh_lookup = ip6_dst_neigh_lookup,
63fca65d 266 .confirm_neigh = ip6_confirm_neigh,
1da177e4
LT		 267};
268
14e50e57 269static struct dst_ops ip6_dst_blackhole_ops = {
c4c877b2
DB		 270 .family = AF_INET6,
271 .default_advmss = ip6_default_advmss,
272 .neigh_lookup = ip6_dst_neigh_lookup,
273 .check = ip6_dst_check,
274 .destroy = ip6_dst_destroy,
275 .cow_metrics = dst_cow_metrics_generic,
276 .update_pmtu = dst_blackhole_update_pmtu,
277 .redirect = dst_blackhole_redirect,
278 .mtu = dst_blackhole_mtu,
14e50e57
DM		 279};
280
62fa8a84 281static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 282 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 283};
284
8d1c802b 285static const struct fib6_info fib6_null_entry_template = {
93c2fb25
DA		 286 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
287 .fib6_protocol = RTPROT_KERNEL,
288 .fib6_metric = ~(u32)0,
f05713e0 289 .fib6_ref = REFCOUNT_INIT(1),
421842ed
DA		 290 .fib6_type = RTN_UNREACHABLE,
291 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
292};
293
fb0af4c7 294static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 295 .dst = {
296 .__refcnt = ATOMIC_INIT(1),
297 .__use = 1,
2c20cbd7 298 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 299 .error = -ENETUNREACH,
d8d1f30b
CG		 300 .input = ip6_pkt_discard,
301 .output = ip6_pkt_discard_out,
1da177e4
LT		 302 },
303 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
1da177e4
LT		 304};
305
101367c2
TG		 306#ifdef CONFIG_IPV6_MULTIPLE_TABLES
307
fb0af4c7 308static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 309 .dst = {
310 .__refcnt = ATOMIC_INIT(1),
311 .__use = 1,
2c20cbd7 312 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 313 .error = -EACCES,
d8d1f30b
CG		 314 .input = ip6_pkt_prohibit,
315 .output = ip6_pkt_prohibit_out,
101367c2
TG		 316 },
317 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 318};
319
fb0af4c7 320static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 321 .dst = {
322 .__refcnt = ATOMIC_INIT(1),
323 .__use = 1,
2c20cbd7 324 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 325 .error = -EINVAL,
d8d1f30b 326 .input = dst_discard,
ede2059d 327 .output = dst_discard_out,
101367c2
TG		 328 },
329 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 330};
331
332#endif
333
ebfa45f0
MKL		 334static void rt6_info_init(struct rt6_info *rt)
335{
8f2a83b4 336 memset_after(rt, 0, dst);
ebfa45f0
MKL		 337 INIT_LIST_HEAD(&rt->rt6i_uncached);
338}
339
1da177e4 340/* allocate dst with ip6_dst_ops */
93531c67
DA		 341struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
342 int flags)
1da177e4 343{
97bab73f 344 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
b2a9c0ed 345 1, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 346
81eb8447 347 if (rt) {
ebfa45f0 348 rt6_info_init(rt);
81eb8447
WW		 349 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
350 }
8104891b 351
cf911662 352 return rt;
1da177e4 353}
9ab179d8 354EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 355
1da177e4
LT		 356static void ip6_dst_destroy(struct dst_entry *dst)
357{
358 struct rt6_info *rt = (struct rt6_info *)dst;
a68886a6 359 struct fib6_info *from;
8d0b94af 360 struct inet6_dev *idev;
1da177e4 361
1620a336 362 ip_dst_metrics_put(dst);
8d0b94af
MKL		 363 rt6_uncached_list_del(rt);
364
365 idev = rt->rt6i_idev;
38308473 366 if (idev) {
1da177e4
LT		 367 rt->rt6i_idev = NULL;
368 in6_dev_put(idev);
1ab1457c 369 }
1716a961 370
0e233874 371 from = xchg((__force struct fib6_info **)&rt->from, NULL);
93531c67 372 fib6_info_release(from);
b3419363
DM		 373}
374
1da177e4
LT		 375static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
376 int how)
377{
378 struct rt6_info *rt = (struct rt6_info *)dst;
379 struct inet6_dev *idev = rt->rt6i_idev;
380
e5f80fcf
ED		 381 if (idev && idev->dev != blackhole_netdev) {
382 struct inet6_dev *blackhole_idev = in6_dev_get(blackhole_netdev);
383
384 if (blackhole_idev) {
385 rt->rt6i_idev = blackhole_idev;
e5645f51 386 in6_dev_put(idev);
97cac082 387 }
1da177e4
LT		 388 }
389}
390
5973fb1e
MKL		 391static bool __rt6_check_expired(const struct rt6_info *rt)
392{
393 if (rt->rt6i_flags & RTF_EXPIRES)
394 return time_after(jiffies, rt->dst.expires);
395 else
396 return false;
397}
398
a50feda5 399static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 400{
a68886a6
DA		 401 struct fib6_info *from;
402
403 from = rcu_dereference(rt->from);
404
1716a961
G		 405 if (rt->rt6i_flags & RTF_EXPIRES) {
406 if (time_after(jiffies, rt->dst.expires))
a50feda5 407 return true;
a68886a6 408 } else if (from) {
1e2ea8ad 409 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
a68886a6 410 fib6_check_expired(from);
1716a961 411 }
a50feda5 412 return false;
1da177e4
LT		 413}
414
b1d40991
DA		 415void fib6_select_path(const struct net *net, struct fib6_result *res,
416 struct flowi6 *fl6, int oif, bool have_oif_match,
417 const struct sk_buff *skb, int strict)
51ebd318 418{
8d1c802b 419 struct fib6_info *sibling, *next_sibling;
b1d40991
DA		 420 struct fib6_info *match = res->f6i;
421
34fe5a1c 422 if (!match->nh && (!match->fib6_nsiblings || have_oif_match))
b1d40991 423 goto out;
51ebd318 424
34fe5a1c
DA		 425 if (match->nh && have_oif_match && res->nh)
426 return;
427
b673d6cc
JS		 428 /* We might have already computed the hash for ICMPv6 errors. In such
429 * case it will always be non-zero. Otherwise now is the time to do it.
430 */
f88d8ea6
DA		 431 if (!fl6->mp_hash &&
432 (!match->nh || nexthop_is_multipath(match->nh)))
b4bac172 433 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
b673d6cc 434
f88d8ea6
DA		 435 if (unlikely(match->nh)) {
436 nexthop_path_fib6_result(res, fl6->mp_hash);
437 return;
438 }
439
1cf844c7 440 if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound))
b1d40991 441 goto out;
3d709f69 442
93c2fb25
DA		 443 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
444 fib6_siblings) {
1cf844c7 445 const struct fib6_nh *nh = sibling->fib6_nh;
5e670d84
DA		 446 int nh_upper_bound;
447
702cea56 448 nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
5e670d84 449 if (fl6->mp_hash > nh_upper_bound)
3d709f69 450 continue;
702cea56 451 if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
3d709f69
IS		 452 break;
453 match = sibling;
454 break;
455 }
456
b1d40991
DA		 457out:
458 res->f6i = match;
1cf844c7 459 res->nh = match->fib6_nh;
51ebd318
ND		 460}
461
1da177e4 462/*
66f5d6ce 463 * Route lookup. rcu_read_lock() should be held.
1da177e4
LT		 464 */
465
0c59d006
DA		 466static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
467 const struct in6_addr *saddr, int oif, int flags)
468{
469 const struct net_device *dev;
470
471 if (nh->fib_nh_flags & RTNH_F_DEAD)
472 return false;
473
474 dev = nh->fib_nh_dev;
475 if (oif) {
476 if (dev->ifindex == oif)
477 return true;
478 } else {
479 if (ipv6_chk_addr(net, saddr, dev,
480 flags & RT6_LOOKUP_F_IFACE))
481 return true;
482 }
483
484 return false;
485}
486
962b6803
DA		 487struct fib6_nh_dm_arg {
488 struct net *net;
489 const struct in6_addr *saddr;
490 int oif;
491 int flags;
492 struct fib6_nh *nh;
493};
494
495static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg)
496{
497 struct fib6_nh_dm_arg *arg = _arg;
498
499 arg->nh = nh;
500 return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif,
501 arg->flags);
502}
503
504/* returns fib6_nh from nexthop or NULL */
505static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh,
506 struct fib6_result *res,
507 const struct in6_addr *saddr,
508 int oif, int flags)
509{
510 struct fib6_nh_dm_arg arg = {
511 .net = net,
512 .saddr = saddr,
513 .oif = oif,
514 .flags = flags,
515 };
516
517 if (nexthop_is_blackhole(nh))
518 return NULL;
519
520 if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg))
521 return arg.nh;
522
523 return NULL;
524}
525
75ef7389
DA		 526static void rt6_device_match(struct net *net, struct fib6_result *res,
527 const struct in6_addr *saddr, int oif, int flags)
1da177e4 528{
75ef7389
DA		 529 struct fib6_info *f6i = res->f6i;
530 struct fib6_info *spf6i;
531 struct fib6_nh *nh;
1da177e4 532
75ef7389 533 if (!oif && ipv6_addr_any(saddr)) {
f88d8ea6
DA		 534 if (unlikely(f6i->nh)) {
535 nh = nexthop_fib6_nh(f6i->nh);
536 if (nexthop_is_blackhole(f6i->nh))
537 goto out_blackhole;
538 } else {
539 nh = f6i->fib6_nh;
540 }
7d21fec9
DA		 541 if (!(nh->fib_nh_flags & RTNH_F_DEAD))
542 goto out;
75ef7389 543 }
dd3abc4e 544
75ef7389 545 for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
962b6803
DA		 546 bool matched = false;
547
548 if (unlikely(spf6i->nh)) {
549 nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr,
550 oif, flags);
551 if (nh)
552 matched = true;
553 } else {
554 nh = spf6i->fib6_nh;
555 if (__rt6_device_match(net, nh, saddr, oif, flags))
556 matched = true;
557 }
558 if (matched) {
75ef7389 559 res->f6i = spf6i;
7d21fec9 560 goto out;
75ef7389 561 }
dd3abc4e 562 }
1da177e4 563
75ef7389
DA		 564 if (oif && flags & RT6_LOOKUP_F_IFACE) {
565 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 566 nh = res->f6i->fib6_nh;
7d21fec9 567 goto out;
75ef7389 568 }
8067bb8c 569
f88d8ea6
DA		 570 if (unlikely(f6i->nh)) {
571 nh = nexthop_fib6_nh(f6i->nh);
572 if (nexthop_is_blackhole(f6i->nh))
573 goto out_blackhole;
574 } else {
575 nh = f6i->fib6_nh;
576 }
577
7d21fec9 578 if (nh->fib_nh_flags & RTNH_F_DEAD) {
75ef7389 579 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 580 nh = res->f6i->fib6_nh;
75ef7389 581 }
7d21fec9
DA		 582out:
583 res->nh = nh;
584 res->fib6_type = res->f6i->fib6_type;
585 res->fib6_flags = res->f6i->fib6_flags;
f88d8ea6
DA		 586 return;
587
588out_blackhole:
589 res->fib6_flags |= RTF_REJECT;
590 res->fib6_type = RTN_BLACKHOLE;
591 res->nh = nh;
1da177e4
LT		 592}
593
27097255 594#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 595struct __rt6_probe_work {
596 struct work_struct work;
597 struct in6_addr target;
598 struct net_device *dev;
fb67510b 599 netdevice_tracker dev_tracker;
c2f17e82
HFS		 600};
601
602static void rt6_probe_deferred(struct work_struct *w)
603{
604 struct in6_addr mcaddr;
605 struct __rt6_probe_work *work =
606 container_of(w, struct __rt6_probe_work, work);
607
608 addrconf_addr_solict_mult(&work->target, &mcaddr);
adc176c5 609 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
d62607c3 610 netdev_put(work->dev, &work->dev_tracker);
662f5533 611 kfree(work);
c2f17e82
HFS		 612}
613
cc3a86c8 614static void rt6_probe(struct fib6_nh *fib6_nh)
27097255 615{
f547fac6 616 struct __rt6_probe_work *work = NULL;
5e670d84 617 const struct in6_addr *nh_gw;
1bef4c22 618 unsigned long last_probe;
f2c31e32 619 struct neighbour *neigh;
5e670d84 620 struct net_device *dev;
f547fac6 621 struct inet6_dev *idev;
5e670d84 622
27097255
YH		 623 /*
624 * Okay, this does not seem to be appropriate
625 * for now, however, we need to check if it
626 * is really so; aka Router Reachability Probing.
627 *
628 * Router Reachability Probe MUST be rate-limited
629 * to no more than one per minute.
630 */
004b3942 631 if (!fib6_nh->fib_nh_gw_family)
7ff74a59 632 return;
5e670d84 633
cc3a86c8
DA		 634 nh_gw = &fib6_nh->fib_nh_gw6;
635 dev = fib6_nh->fib_nh_dev;
2152caea 636 rcu_read_lock_bh();
1bef4c22 637 last_probe = READ_ONCE(fib6_nh->last_probe);
f547fac6 638 idev = __in6_dev_get(dev);
5e670d84 639 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
2152caea 640 if (neigh) {
b071af52 641 if (READ_ONCE(neigh->nud_state) & NUD_VALID)
8d6c31bf
MKL		 642 goto out;
643
2152caea 644 write_lock(&neigh->lock);
990edb42
MKL		 645 if (!(neigh->nud_state & NUD_VALID) &&
646 time_after(jiffies,
dcd1f572 647 neigh->updated + idev->cnf.rtr_probe_interval)) {
990edb42
MKL		 648 work = kmalloc(sizeof(*work), GFP_ATOMIC);
649 if (work)
650 __neigh_set_probe_once(neigh);
c2f17e82 651 }
2152caea 652 write_unlock(&neigh->lock);
1bef4c22 653 } else if (time_after(jiffies, last_probe +
f547fac6 654 idev->cnf.rtr_probe_interval)) {
990edb42 655 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 656 }
990edb42 657
1bef4c22
ED		 658 if (!work || cmpxchg(&fib6_nh->last_probe,
659 last_probe, jiffies) != last_probe) {
660 kfree(work);
661 } else {
990edb42 662 INIT_WORK(&work->work, rt6_probe_deferred);
5e670d84 663 work->target = *nh_gw;
d62607c3 664 netdev_hold(dev, &work->dev_tracker, GFP_ATOMIC);
5e670d84 665 work->dev = dev;
990edb42
MKL		 666 schedule_work(&work->work);
667 }
668
8d6c31bf 669out:
2152caea 670 rcu_read_unlock_bh();
27097255
YH		 671}
672#else
cc3a86c8 673static inline void rt6_probe(struct fib6_nh *fib6_nh)
27097255 674{
27097255
YH		 675}
676#endif
677
1da177e4 678/*
554cfb7e 679 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 680 */
1ba9a895 681static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
1da177e4 682{
afc154e9 683 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
5e670d84 684 struct neighbour *neigh;
f2c31e32 685
145a3621 686 rcu_read_lock_bh();
1ba9a895
DA		 687 neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
688 &fib6_nh->fib_nh_gw6);
145a3621
YH		 689 if (neigh) {
690 read_lock(&neigh->lock);
554cfb7e 691 if (neigh->nud_state & NUD_VALID)
afc154e9 692 ret = RT6_NUD_SUCCEED;
398bcbeb 693#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 694 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 695 ret = RT6_NUD_SUCCEED;
7e980569
JB		 696 else
697 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 698#endif
145a3621 699 read_unlock(&neigh->lock);
afc154e9
HFS		 700 } else {
701 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 702 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 703 }
145a3621
YH		 704 rcu_read_unlock_bh();
705
a5a81f0b 706 return ret;
1da177e4
LT		 707}
708
702cea56
DA		 709static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
710 int strict)
1da177e4 711{
6e1809a5
DA		 712 int m = 0;
713
714 if (!oif || nh->fib_nh_dev->ifindex == oif)
715 m = 2;
1ab1457c 716
77d16f45 717 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 718 return RT6_NUD_FAIL_HARD;
ebacaaa0 719#ifdef CONFIG_IPV6_ROUTER_PREF
702cea56 720 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
ebacaaa0 721#endif
1ba9a895 722 if ((strict & RT6_LOOKUP_F_REACHABLE) &&
702cea56 723 !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
1ba9a895 724 int n = rt6_check_neigh(nh);
afc154e9
HFS		 725 if (n < 0)
726 return n;
727 }
554cfb7e
YH		 728 return m;
729}
730
28679ed1
DA		 731static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
732 int oif, int strict, int *mpri, bool *do_rr)
554cfb7e 733{
afc154e9 734 bool match_do_rr = false;
28679ed1
DA		 735 bool rc = false;
736 int m;
35103d11 737
28679ed1 738 if (nh->fib_nh_flags & RTNH_F_DEAD)
8067bb8c
IS		 739 goto out;
740
28679ed1
DA		 741 if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
742 nh->fib_nh_flags & RTNH_F_LINKDOWN &&
d5d32e4b 743 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
35103d11 744 goto out;
f11e6659 745
28679ed1 746 m = rt6_score_route(nh, fib6_flags, oif, strict);
7e980569 747 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 748 match_do_rr = true;
749 m = 0; /* lowest valid score */
7e980569 750 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 751 goto out;
afc154e9
HFS		 752 }
753
754 if (strict & RT6_LOOKUP_F_REACHABLE)
28679ed1 755 rt6_probe(nh);
f11e6659 756
7e980569 757 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 758 if (m > *mpri) {
afc154e9 759 *do_rr = match_do_rr;
f11e6659 760 *mpri = m;
28679ed1 761 rc = true;
f11e6659 762 }
f11e6659 763out:
28679ed1 764 return rc;
f11e6659
DM		 765}
766
17a5984e
DA		 767struct fib6_nh_frl_arg {
768 u32 flags;
769 int oif;
770 int strict;
771 int *mpri;
772 bool *do_rr;
773 struct fib6_nh *nh;
774};
775
776static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg)
777{
778 struct fib6_nh_frl_arg *arg = _arg;
779
780 arg->nh = nh;
781 return find_match(nh, arg->flags, arg->oif, arg->strict,
782 arg->mpri, arg->do_rr);
783}
784
b7bc4b6a 785static void __find_rr_leaf(struct fib6_info *f6i_start,
30c15f03 786 struct fib6_info *nomatch, u32 metric,
b7bc4b6a 787 struct fib6_result *res, struct fib6_info **cont,
30c15f03 788 int oif, int strict, bool *do_rr, int *mpri)
f11e6659 789{
b7bc4b6a 790 struct fib6_info *f6i;
1da177e4 791
b7bc4b6a
DA		 792 for (f6i = f6i_start;
793 f6i && f6i != nomatch;
794 f6i = rcu_dereference(f6i->fib6_next)) {
17a5984e 795 bool matched = false;
30c15f03
DA		 796 struct fib6_nh *nh;
797
b7bc4b6a
DA		 798 if (cont && f6i->fib6_metric != metric) {
799 *cont = f6i;
30c15f03 800 return;
9fbdcfaf
SK		 801 }
802
b7bc4b6a 803 if (fib6_check_expired(f6i))
28679ed1
DA		 804 continue;
805
17a5984e
DA		 806 if (unlikely(f6i->nh)) {
807 struct fib6_nh_frl_arg arg = {
808 .flags = f6i->fib6_flags,
809 .oif = oif,
810 .strict = strict,
811 .mpri = mpri,
812 .do_rr = do_rr
813 };
814
815 if (nexthop_is_blackhole(f6i->nh)) {
816 res->fib6_flags = RTF_REJECT;
817 res->fib6_type = RTN_BLACKHOLE;
818 res->f6i = f6i;
819 res->nh = nexthop_fib6_nh(f6i->nh);
820 return;
821 }
822 if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match,
823 &arg)) {
824 matched = true;
825 nh = arg.nh;
826 }
827 } else {
828 nh = f6i->fib6_nh;
829 if (find_match(nh, f6i->fib6_flags, oif, strict,
830 mpri, do_rr))
831 matched = true;
832 }
833 if (matched) {
b7bc4b6a
DA		 834 res->f6i = f6i;
835 res->nh = nh;
7d21fec9
DA		 836 res->fib6_flags = f6i->fib6_flags;
837 res->fib6_type = f6i->fib6_type;
b7bc4b6a 838 }
9fbdcfaf 839 }
30c15f03 840}
9fbdcfaf 841
b7bc4b6a
DA		 842static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
843 struct fib6_info *rr_head, int oif, int strict,
844 bool *do_rr, struct fib6_result *res)
30c15f03 845{
b7bc4b6a
DA		 846 u32 metric = rr_head->fib6_metric;
847 struct fib6_info *cont = NULL;
30c15f03 848 int mpri = -1;
9fbdcfaf 849
b7bc4b6a 850 __find_rr_leaf(rr_head, NULL, metric, res, &cont,
30c15f03 851 oif, strict, do_rr, &mpri);
28679ed1 852
b7bc4b6a 853 __find_rr_leaf(leaf, rr_head, metric, res, &cont,
30c15f03 854 oif, strict, do_rr, &mpri);
9fbdcfaf 855
b7bc4b6a
DA		 856 if (res->f6i || !cont)
857 return;
9fbdcfaf 858
b7bc4b6a 859 __find_rr_leaf(cont, NULL, metric, res, NULL,
30c15f03 860 oif, strict, do_rr, &mpri);
f11e6659 861}
1da177e4 862
b7bc4b6a
DA		 863static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
864 struct fib6_result *res, int strict)
f11e6659 865{
8d1c802b 866 struct fib6_info *leaf = rcu_dereference(fn->leaf);
b7bc4b6a 867 struct fib6_info *rt0;
afc154e9 868 bool do_rr = false;
17ecf590 869 int key_plen;
1da177e4 870
b7bc4b6a
DA		 871 /* make sure this function or its helpers sets f6i */
872 res->f6i = NULL;
873
421842ed 874 if (!leaf || leaf == net->ipv6.fib6_null_entry)
b7bc4b6a 875 goto out;
8d1040e8 876
66f5d6ce 877 rt0 = rcu_dereference(fn->rr_ptr);
f11e6659 878 if (!rt0)
66f5d6ce 879 rt0 = leaf;
1da177e4 880
17ecf590
WW		 881 /* Double check to make sure fn is not an intermediate node
882 * and fn->leaf does not points to its child's leaf
883 * (This might happen if all routes under fn are deleted from
884 * the tree and fib6_repair_tree() is called on the node.)
885 */
93c2fb25 886 key_plen = rt0->fib6_dst.plen;
17ecf590 887#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 888 if (rt0->fib6_src.plen)
889 key_plen = rt0->fib6_src.plen;
17ecf590
WW		 890#endif
891 if (fn->fn_bit != key_plen)
b7bc4b6a 892 goto out;
1da177e4 893
b7bc4b6a 894 find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
afc154e9 895 if (do_rr) {
8fb11a9a 896 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
f11e6659 897
554cfb7e 898 /* no entries matched; do round-robin */
93c2fb25 899 if (!next || next->fib6_metric != rt0->fib6_metric)
8d1040e8 900 next = leaf;
f11e6659 901
66f5d6ce 902 if (next != rt0) {
93c2fb25 903 spin_lock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 904 /* make sure next is not being deleted from the tree */
93c2fb25 905 if (next->fib6_node)
66f5d6ce 906 rcu_assign_pointer(fn->rr_ptr, next);
93c2fb25 907 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 908 }
1da177e4 909 }
1da177e4 910
b7bc4b6a
DA		 911out:
912 if (!res->f6i) {
913 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 914 res->nh = res->f6i->fib6_nh;
7d21fec9
DA		 915 res->fib6_flags = res->f6i->fib6_flags;
916 res->fib6_type = res->f6i->fib6_type;
b7bc4b6a 917 }
1da177e4
LT		 918}
919
85bd05de 920static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
8b9df265 921{
85bd05de
DA		 922 return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
923 res->nh->fib_nh_gw_family;
8b9df265
MKL		 924}
925
70ceb4f5
YH		 926#ifdef CONFIG_IPV6_ROUTE_INFO
927int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 928 const struct in6_addr *gwaddr)
70ceb4f5 929{
c346dca1 930 struct net *net = dev_net(dev);
70ceb4f5
YH		 931 struct route_info *rinfo = (struct route_info *) opt;
932 struct in6_addr prefix_buf, *prefix;
933 unsigned int pref;
4bed72e4 934 unsigned long lifetime;
8d1c802b 935 struct fib6_info *rt;
70ceb4f5
YH		 936
937 if (len < sizeof(struct route_info)) {
938 return -EINVAL;
939 }
940
941 /* Sanity check for prefix_len and length */
942 if (rinfo->length > 3) {
943 return -EINVAL;
944 } else if (rinfo->prefix_len > 128) {
945 return -EINVAL;
946 } else if (rinfo->prefix_len > 64) {
947 if (rinfo->length < 2) {
948 return -EINVAL;
949 }
950 } else if (rinfo->prefix_len > 0) {
951 if (rinfo->length < 1) {
952 return -EINVAL;
953 }
954 }
955
956 pref = rinfo->route_pref;
957 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 958 return -EINVAL;
70ceb4f5 959
4bed72e4 960 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 961
962 if (rinfo->length == 3)
963 prefix = (struct in6_addr *)rinfo->prefix;
964 else {
965 /* this function is safe */
966 ipv6_addr_prefix(&prefix_buf,
967 (struct in6_addr *)rinfo->prefix,
968 rinfo->prefix_len);
969 prefix = &prefix_buf;
970 }
971
f104a567 972 if (rinfo->prefix_len == 0)
afb1d4b5 973 rt = rt6_get_dflt_router(net, gwaddr, dev);
f104a567
DJ		 974 else
975 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
830218c1 976 gwaddr, dev);
70ceb4f5
YH		 977
978 if (rt && !lifetime) {
11dd74b3 979 ip6_del_rt(net, rt, false);
70ceb4f5
YH		 980 rt = NULL;
981 }
982
983 if (!rt && lifetime)
830218c1
DA		 984 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
985 dev, pref);
70ceb4f5 986 else if (rt)
93c2fb25
DA		 987 rt->fib6_flags = RTF_ROUTEINFO |
988 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
70ceb4f5
YH		 989
990 if (rt) {
1716a961 991 if (!addrconf_finite_timeout(lifetime))
14895687 992 fib6_clean_expires(rt);
1716a961 993 else
14895687 994 fib6_set_expires(rt, jiffies + HZ * lifetime);
1716a961 995
93531c67 996 fib6_info_release(rt);
70ceb4f5
YH		 997 }
998 return 0;
999}
1000#endif
1001
ae90d867
DA		 1002/*
1003 * Misc support functions
1004 */
1005
1006/* called with rcu_lock held */
0d161581 1007static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
ae90d867 1008{
0d161581 1009 struct net_device *dev = res->nh->fib_nh_dev;
ae90d867 1010
7d21fec9 1011 if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
ae90d867
DA		 1012 /* for copies of local routes, dst->dev needs to be the
1013 * device if it is a master device, the master device if
1014 * device is enslaved, and the loopback as the default
1015 */
1016 if (netif_is_l3_slave(dev) &&
7d21fec9 1017 !rt6_need_strict(&res->f6i->fib6_dst.addr))
ae90d867
DA		 1018 dev = l3mdev_master_dev_rcu(dev);
1019 else if (!netif_is_l3_master(dev))
1020 dev = dev_net(dev)->loopback_dev;
1021 /* last case is netif_is_l3_master(dev) is true in which
1022 * case we want dev returned to be dev
1023 */
1024 }
1025
1026 return dev;
1027}
1028
6edb3c96
DA		 1029static const int fib6_prop[RTN_MAX + 1] = {
1030 [RTN_UNSPEC] = 0,
1031 [RTN_UNICAST] = 0,
1032 [RTN_LOCAL] = 0,
1033 [RTN_BROADCAST] = 0,
1034 [RTN_ANYCAST] = 0,
1035 [RTN_MULTICAST] = 0,
1036 [RTN_BLACKHOLE] = -EINVAL,
1037 [RTN_UNREACHABLE] = -EHOSTUNREACH,
1038 [RTN_PROHIBIT] = -EACCES,
1039 [RTN_THROW] = -EAGAIN,
1040 [RTN_NAT] = -EINVAL,
1041 [RTN_XRESOLVE] = -EINVAL,
1042};
1043
1044static int ip6_rt_type_to_error(u8 fib6_type)
1045{
1046 return fib6_prop[fib6_type];
1047}
1048
8d1c802b 1049static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
3b6761d1
DA		 1050{
1051 unsigned short flags = 0;
1052
1053 if (rt->dst_nocount)
1054 flags |= DST_NOCOUNT;
1055 if (rt->dst_nopolicy)
1056 flags |= DST_NOPOLICY;
3b6761d1
DA		 1057
1058 return flags;
1059}
1060
7d21fec9 1061static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
6edb3c96 1062{
7d21fec9 1063 rt->dst.error = ip6_rt_type_to_error(fib6_type);
6edb3c96 1064
7d21fec9 1065 switch (fib6_type) {
6edb3c96
DA		 1066 case RTN_BLACKHOLE:
1067 rt->dst.output = dst_discard_out;
1068 rt->dst.input = dst_discard;
1069 break;
1070 case RTN_PROHIBIT:
1071 rt->dst.output = ip6_pkt_prohibit_out;
1072 rt->dst.input = ip6_pkt_prohibit;
1073 break;
1074 case RTN_THROW:
1075 case RTN_UNREACHABLE:
1076 default:
1077 rt->dst.output = ip6_pkt_discard_out;
1078 rt->dst.input = ip6_pkt_discard;
1079 break;
1080 }
1081}
1082
0d161581 1083static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
6edb3c96 1084{
7d21fec9 1085 struct fib6_info *f6i = res->f6i;
0d161581 1086
7d21fec9
DA		 1087 if (res->fib6_flags & RTF_REJECT) {
1088 ip6_rt_init_dst_reject(rt, res->fib6_type);
6edb3c96
DA		 1089 return;
1090 }
1091
1092 rt->dst.error = 0;
1093 rt->dst.output = ip6_output;
1094
7d21fec9 1095 if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
6edb3c96 1096 rt->dst.input = ip6_input;
7d21fec9 1097 } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
6edb3c96
DA		 1098 rt->dst.input = ip6_mc_input;
1099 } else {
1100 rt->dst.input = ip6_forward;
1101 }
1102
0d161581
DA		 1103 if (res->nh->fib_nh_lws) {
1104 rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
6edb3c96
DA		 1105 lwtunnel_set_redirect(&rt->dst);
1106 }
1107
1108 rt->dst.lastuse = jiffies;
1109}
1110
e873e4b9 1111/* Caller must already hold reference to @from */
8d1c802b 1112static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
ae90d867 1113{
ae90d867 1114 rt->rt6i_flags &= ~RTF_EXPIRES;
a68886a6 1115 rcu_assign_pointer(rt->from, from);
e1255ed4 1116 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
ae90d867
DA		 1117}
1118
0d161581
DA		 1119/* Caller must already hold reference to f6i in result */
1120static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
ae90d867 1121{
0d161581
DA		 1122 const struct fib6_nh *nh = res->nh;
1123 const struct net_device *dev = nh->fib_nh_dev;
1124 struct fib6_info *f6i = res->f6i;
dcd1f572 1125
0d161581 1126 ip6_rt_init_dst(rt, res);
6edb3c96 1127
0d161581 1128 rt->rt6i_dst = f6i->fib6_dst;
dcd1f572 1129 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
7d21fec9 1130 rt->rt6i_flags = res->fib6_flags;
0d161581
DA		 1131 if (nh->fib_nh_gw_family) {
1132 rt->rt6i_gateway = nh->fib_nh_gw6;
2b2450ca
DA		 1133 rt->rt6i_flags |= RTF_GATEWAY;
1134 }
0d161581 1135 rt6_set_from(rt, f6i);
ae90d867 1136#ifdef CONFIG_IPV6_SUBTREES
0d161581 1137 rt->rt6i_src = f6i->fib6_src;
ae90d867 1138#endif
ae90d867
DA		 1139}
1140
a3c00e46
MKL		 1141static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
1142 struct in6_addr *saddr)
1143{
66f5d6ce 1144 struct fib6_node *pn, *sn;
a3c00e46
MKL		 1145 while (1) {
1146 if (fn->fn_flags & RTN_TL_ROOT)
1147 return NULL;
66f5d6ce
WW		 1148 pn = rcu_dereference(fn->parent);
1149 sn = FIB6_SUBTREE(pn);
1150 if (sn && sn != fn)
6454743b 1151 fn = fib6_node_lookup(sn, NULL, saddr);
a3c00e46
MKL		 1152 else
1153 fn = pn;
1154 if (fn->fn_flags & RTN_RTINFO)
1155 return fn;
1156 }
1157}
c71099ac 1158
10585b43 1159static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
d3843fe5
WW		 1160{
1161 struct rt6_info *rt = *prt;
1162
1163 if (dst_hold_safe(&rt->dst))
1164 return true;
10585b43 1165 if (net) {
d3843fe5
WW		 1166 rt = net->ipv6.ip6_null_entry;
1167 dst_hold(&rt->dst);
1168 } else {
1169 rt = NULL;
1170 }
1171 *prt = rt;
1172 return false;
1173}
1174
dec9b0e2 1175/* called with rcu_lock held */
9b6b35ab 1176static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
dec9b0e2 1177{
9b6b35ab
DA		 1178 struct net_device *dev = res->nh->fib_nh_dev;
1179 struct fib6_info *f6i = res->f6i;
1180 unsigned short flags;
dec9b0e2
DA		 1181 struct rt6_info *nrt;
1182
9b6b35ab 1183 if (!fib6_info_hold_safe(f6i))
1c87e79a 1184 goto fallback;
e873e4b9 1185
9b6b35ab 1186 flags = fib6_info_dst_flags(f6i);
93531c67 1187 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
1c87e79a 1188 if (!nrt) {
9b6b35ab 1189 fib6_info_release(f6i);
1c87e79a
XL		 1190 goto fallback;
1191 }
dec9b0e2 1192
0d161581 1193 ip6_rt_copy_init(nrt, res);
1c87e79a
XL		 1194 return nrt;
1195
1196fallback:
1197 nrt = dev_net(dev)->ipv6.ip6_null_entry;
1198 dst_hold(&nrt->dst);
dec9b0e2
DA		 1199 return nrt;
1200}
1201
55cced4f 1202INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net,
8ed67789 1203 struct fib6_table *table,
b75cc8f9
DA		 1204 struct flowi6 *fl6,
1205 const struct sk_buff *skb,
1206 int flags)
1da177e4 1207{
b1d40991 1208 struct fib6_result res = {};
1da177e4 1209 struct fib6_node *fn;
23fb93a4 1210 struct rt6_info *rt;
1da177e4 1211
66f5d6ce 1212 rcu_read_lock();
6454743b 1213 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac 1214restart:
b1d40991
DA		 1215 res.f6i = rcu_dereference(fn->leaf);
1216 if (!res.f6i)
1217 res.f6i = net->ipv6.fib6_null_entry;
af52a52c 1218 else
75ef7389
DA		 1219 rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
1220 flags);
af52a52c 1221
b1d40991 1222 if (res.f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 1223 fn = fib6_backtrack(fn, &fl6->saddr);
1224 if (fn)
1225 goto restart;
2b760fcf 1226
af52a52c
DA		 1227 rt = net->ipv6.ip6_null_entry;
1228 dst_hold(&rt->dst);
1229 goto out;
f88d8ea6
DA		 1230 } else if (res.fib6_flags & RTF_REJECT) {
1231 goto do_create;
af52a52c 1232 }
d3843fe5 1233
b1d40991
DA		 1234 fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
1235 fl6->flowi6_oif != 0, skb, flags);
1236
2b760fcf 1237 /* Search through exception table */
7e4b5128 1238 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
23fb93a4 1239 if (rt) {
10585b43 1240 if (ip6_hold_safe(net, &rt))
dec9b0e2 1241 dst_use_noref(&rt->dst, jiffies);
23fb93a4 1242 } else {
f88d8ea6 1243do_create:
9b6b35ab 1244 rt = ip6_create_rt_rcu(&res);
dec9b0e2 1245 }
b811580d 1246
af52a52c 1247out:
8ff2e5b2 1248 trace_fib6_table_lookup(net, &res, table, fl6);
af52a52c 1249
66f5d6ce 1250 rcu_read_unlock();
b811580d 1251
c71099ac 1252 return rt;
c71099ac
TG		 1253}
1254
67ba4152 1255struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
b75cc8f9 1256 const struct sk_buff *skb, int flags)
ea6e574e 1257{
b75cc8f9 1258 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
ea6e574e
FW		 1259}
1260EXPORT_SYMBOL_GPL(ip6_route_lookup);
1261
9acd9f3a 1262struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
b75cc8f9
DA		 1263 const struct in6_addr *saddr, int oif,
1264 const struct sk_buff *skb, int strict)
c71099ac 1265{
4c9483b2
DM		 1266 struct flowi6 fl6 = {
1267 .flowi6_oif = oif,
1268 .daddr = *daddr,
c71099ac
TG		 1269 };
1270 struct dst_entry *dst;
77d16f45 1271 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 1272
adaa70bb 1273 if (saddr) {
4c9483b2 1274 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 1275 flags |= RT6_LOOKUP_F_HAS_SADDR;
1276 }
1277
b75cc8f9 1278 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
c71099ac
TG		 1279 if (dst->error == 0)
1280 return (struct rt6_info *) dst;
1281
1282 dst_release(dst);
1283
1da177e4
LT		 1284 return NULL;
1285}
7159039a
YH		 1286EXPORT_SYMBOL(rt6_lookup);
1287
c71099ac 1288/* ip6_ins_rt is called with FREE table->tb6_lock.
1cfb71ee
WW		 1289 * It takes new route entry, the addition fails by any reason the
1290 * route is released.
1291 * Caller must hold dst before calling it.
1da177e4
LT		 1292 */
1293
8d1c802b 1294static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
333c4301 1295 struct netlink_ext_ack *extack)
1da177e4
LT		 1296{
1297 int err;
c71099ac 1298 struct fib6_table *table;
1da177e4 1299
93c2fb25 1300 table = rt->fib6_table;
66f5d6ce 1301 spin_lock_bh(&table->tb6_lock);
d4ead6b3 1302 err = fib6_add(&table->tb6_root, rt, info, extack);
66f5d6ce 1303 spin_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1304
1305 return err;
1306}
1307
8d1c802b 1308int ip6_ins_rt(struct net *net, struct fib6_info *rt)
40e22e8f 1309{
afb1d4b5 1310 struct nl_info info = { .nl_net = net, };
e715b6d3 1311
d4ead6b3 1312 return __ip6_ins_rt(rt, &info, NULL);
40e22e8f
TG		 1313}
1314
85bd05de 1315static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
8b9df265
MKL		 1316 const struct in6_addr *daddr,
1317 const struct in6_addr *saddr)
1da177e4 1318{
85bd05de 1319 struct fib6_info *f6i = res->f6i;
4832c30d 1320 struct net_device *dev;
1da177e4
LT		 1321 struct rt6_info *rt;
1322
1323 /*
1324 * Clone the route.
1325 */
1326
85bd05de 1327 if (!fib6_info_hold_safe(f6i))
e873e4b9
WW		 1328 return NULL;
1329
0d161581 1330 dev = ip6_rt_get_dev_rcu(res);
93531c67 1331 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
e873e4b9 1332 if (!rt) {
85bd05de 1333 fib6_info_release(f6i);
83a09abd 1334 return NULL;
e873e4b9 1335 }
83a09abd 1336
0d161581 1337 ip6_rt_copy_init(rt, res);
83a09abd 1338 rt->rt6i_flags |= RTF_CACHE;
83a09abd
MKL		 1339 rt->rt6i_dst.addr = *daddr;
1340 rt->rt6i_dst.plen = 128;
1da177e4 1341
85bd05de
DA		 1342 if (!rt6_is_gw_or_nonexthop(res)) {
1343 if (f6i->fib6_dst.plen != 128 &&
1344 ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
83a09abd 1345 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 1346#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 1347 if (rt->rt6i_src.plen && saddr) {
1348 rt->rt6i_src.addr = *saddr;
1349 rt->rt6i_src.plen = 128;
8b9df265 1350 }
83a09abd 1351#endif
95a9a5ba 1352 }
1da177e4 1353
95a9a5ba
YH		 1354 return rt;
1355}
1da177e4 1356
db3fedee 1357static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
d52d3997 1358{
db3fedee
DA		 1359 struct fib6_info *f6i = res->f6i;
1360 unsigned short flags = fib6_info_dst_flags(f6i);
4832c30d 1361 struct net_device *dev;
d52d3997
MKL		 1362 struct rt6_info *pcpu_rt;
1363
db3fedee 1364 if (!fib6_info_hold_safe(f6i))
e873e4b9
WW		 1365 return NULL;
1366
4832c30d 1367 rcu_read_lock();
0d161581 1368 dev = ip6_rt_get_dev_rcu(res);
d8882935 1369 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT);
4832c30d 1370 rcu_read_unlock();
e873e4b9 1371 if (!pcpu_rt) {
db3fedee 1372 fib6_info_release(f6i);
d52d3997 1373 return NULL;
e873e4b9 1374 }
0d161581 1375 ip6_rt_copy_init(pcpu_rt, res);
d52d3997 1376 pcpu_rt->rt6i_flags |= RTF_PCPU;
8f34e53b
DA		 1377
1378 if (f6i->nh)
1379 pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev));
1380
d52d3997
MKL		 1381 return pcpu_rt;
1382}
1383
8f34e53b
DA		 1384static bool rt6_is_valid(const struct rt6_info *rt6)
1385{
1386 return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev));
1387}
1388
66f5d6ce 1389/* It should be called with rcu_read_lock() acquired */
db3fedee 1390static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
d52d3997 1391{
c353071a 1392 struct rt6_info *pcpu_rt;
d52d3997 1393
c353071a 1394 pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu);
d52d3997 1395
8f34e53b
DA		 1396 if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) {
1397 struct rt6_info *prev, **p;
1398
1399 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1400 prev = xchg(p, NULL);
1401 if (prev) {
1402 dst_dev_put(&prev->dst);
1403 dst_release(&prev->dst);
1404 }
1405
1406 pcpu_rt = NULL;
1407 }
1408
a73e4195
MKL		 1409 return pcpu_rt;
1410}
1411
afb1d4b5 1412static struct rt6_info *rt6_make_pcpu_route(struct net *net,
db3fedee 1413 const struct fib6_result *res)
a73e4195
MKL		 1414{
1415 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997 1416
db3fedee 1417 pcpu_rt = ip6_rt_pcpu_alloc(res);
0e09edcc
WW		 1418 if (!pcpu_rt)
1419 return NULL;
d52d3997 1420
f40b6ae2 1421 p = this_cpu_ptr(res->nh->rt6i_pcpu);
a94b9367 1422 prev = cmpxchg(p, NULL, pcpu_rt);
951f788a 1423 BUG_ON(prev);
a94b9367 1424
61fb0d01
ED		 1425 if (res->f6i->fib6_destroying) {
1426 struct fib6_info *from;
1427
1428 from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL);
1429 fib6_info_release(from);
1430 }
1431
d52d3997
MKL		 1432 return pcpu_rt;
1433}
1434
35732d01
WW		 1435/* exception hash table implementation
1436 */
1437static DEFINE_SPINLOCK(rt6_exception_lock);
1438
1439/* Remove rt6_ex from hash table and free the memory
1440 * Caller must hold rt6_exception_lock
1441 */
1442static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1443 struct rt6_exception *rt6_ex)
1444{
f5b51fe8 1445 struct fib6_info *from;
b2427e67 1446 struct net *net;
81eb8447 1447
35732d01
WW		 1448 if (!bucket || !rt6_ex)
1449 return;
b2427e67
CIK		 1450
1451 net = dev_net(rt6_ex->rt6i->dst.dev);
f5b51fe8
PA		 1452 net->ipv6.rt6_stats->fib_rt_cache--;
1453
1454 /* purge completely the exception to allow releasing the held resources:
1455 * some [sk] cache may keep the dst around for unlimited time
1456 */
0e233874 1457 from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
f5b51fe8
PA		 1458 fib6_info_release(from);
1459 dst_dev_put(&rt6_ex->rt6i->dst);
1460
35732d01 1461 hlist_del_rcu(&rt6_ex->hlist);
77634cc6 1462 dst_release(&rt6_ex->rt6i->dst);
35732d01
WW		 1463 kfree_rcu(rt6_ex, rcu);
1464 WARN_ON_ONCE(!bucket->depth);
1465 bucket->depth--;
1466}
1467
1468/* Remove oldest rt6_ex in bucket and free the memory
1469 * Caller must hold rt6_exception_lock
1470 */
1471static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1472{
1473 struct rt6_exception *rt6_ex, *oldest = NULL;
1474
1475 if (!bucket)
1476 return;
1477
1478 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1479 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1480 oldest = rt6_ex;
1481 }
1482 rt6_remove_exception(bucket, oldest);
1483}
1484
1485static u32 rt6_exception_hash(const struct in6_addr *dst,
1486 const struct in6_addr *src)
1487{
49ecc2e9 1488 static siphash_aligned_key_t rt6_exception_key;
4785305c
ED		 1489 struct {
1490 struct in6_addr dst;
1491 struct in6_addr src;
1492 } __aligned(SIPHASH_ALIGNMENT) combined = {
1493 .dst = *dst,
1494 };
1495 u64 val;
35732d01 1496
4785305c 1497 net_get_random_once(&rt6_exception_key, sizeof(rt6_exception_key));
35732d01
WW		 1498
1499#ifdef CONFIG_IPV6_SUBTREES
1500 if (src)
4785305c 1501 combined.src = *src;
35732d01 1502#endif
4785305c
ED		 1503 val = siphash(&combined, sizeof(combined), &rt6_exception_key);
1504
1505 return hash_64(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
35732d01
WW		 1506}
1507
1508/* Helper function to find the cached rt in the hash table
1509 * and update bucket pointer to point to the bucket for this
1510 * (daddr, saddr) pair
1511 * Caller must hold rt6_exception_lock
1512 */
1513static struct rt6_exception *
1514__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1515 const struct in6_addr *daddr,
1516 const struct in6_addr *saddr)
1517{
1518 struct rt6_exception *rt6_ex;
1519 u32 hval;
1520
1521 if (!(*bucket) || !daddr)
1522 return NULL;
1523
1524 hval = rt6_exception_hash(daddr, saddr);
1525 *bucket += hval;
1526
1527 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1528 struct rt6_info *rt6 = rt6_ex->rt6i;
1529 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1530
1531#ifdef CONFIG_IPV6_SUBTREES
1532 if (matched && saddr)
1533 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1534#endif
1535 if (matched)
1536 return rt6_ex;
1537 }
1538 return NULL;
1539}
1540
1541/* Helper function to find the cached rt in the hash table
1542 * and update bucket pointer to point to the bucket for this
1543 * (daddr, saddr) pair
1544 * Caller must hold rcu_read_lock()
1545 */
1546static struct rt6_exception *
1547__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1548 const struct in6_addr *daddr,
1549 const struct in6_addr *saddr)
1550{
1551 struct rt6_exception *rt6_ex;
1552 u32 hval;
1553
1554 WARN_ON_ONCE(!rcu_read_lock_held());
1555
1556 if (!(*bucket) || !daddr)
1557 return NULL;
1558
1559 hval = rt6_exception_hash(daddr, saddr);
1560 *bucket += hval;
1561
1562 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1563 struct rt6_info *rt6 = rt6_ex->rt6i;
1564 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1565
1566#ifdef CONFIG_IPV6_SUBTREES
1567 if (matched && saddr)
1568 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1569#endif
1570 if (matched)
1571 return rt6_ex;
1572 }
1573 return NULL;
1574}
1575
b748f260 1576static unsigned int fib6_mtu(const struct fib6_result *res)
d4ead6b3 1577{
b748f260 1578 const struct fib6_nh *nh = res->nh;
d4ead6b3
DA		 1579 unsigned int mtu;
1580
b748f260
DA		 1581 if (res->f6i->fib6_pmtu) {
1582 mtu = res->f6i->fib6_pmtu;
dcd1f572 1583 } else {
b748f260 1584 struct net_device *dev = nh->fib_nh_dev;
dcd1f572
DA		 1585 struct inet6_dev *idev;
1586
1587 rcu_read_lock();
1588 idev = __in6_dev_get(dev);
1589 mtu = idev->cnf.mtu6;
1590 rcu_read_unlock();
1591 }
1592
d4ead6b3
DA		 1593 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1594
b748f260 1595 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
d4ead6b3
DA		 1596}
1597
cc5c073a
DA		 1598#define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL
1599
1600/* used when the flushed bit is not relevant, only access to the bucket
1601 * (ie., all bucket users except rt6_insert_exception);
1602 *
1603 * called under rcu lock; sometimes called with rt6_exception_lock held
1604 */
1605static
1606struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh,
1607 spinlock_t *lock)
1608{
1609 struct rt6_exception_bucket *bucket;
1610
1611 if (lock)
1612 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1613 lockdep_is_held(lock));
1614 else
1615 bucket = rcu_dereference(nh->rt6i_exception_bucket);
1616
1617 /* remove bucket flushed bit if set */
1618 if (bucket) {
1619 unsigned long p = (unsigned long)bucket;
1620
1621 p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED;
1622 bucket = (struct rt6_exception_bucket *)p;
1623 }
1624
1625 return bucket;
1626}
1627
1628static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket)
1629{
1630 unsigned long p = (unsigned long)bucket;
1631
1632 return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED);
1633}
1634
1635/* called with rt6_exception_lock held */
1636static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh,
1637 spinlock_t *lock)
1638{
1639 struct rt6_exception_bucket *bucket;
1640 unsigned long p;
1641
1642 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1643 lockdep_is_held(lock));
1644
1645 p = (unsigned long)bucket;
1646 p |= FIB6_EXCEPTION_BUCKET_FLUSHED;
1647 bucket = (struct rt6_exception_bucket *)p;
1648 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1649}
1650
35732d01 1651static int rt6_insert_exception(struct rt6_info *nrt,
5012f0a5 1652 const struct fib6_result *res)
35732d01 1653{
5e670d84 1654 struct net *net = dev_net(nrt->dst.dev);
35732d01 1655 struct rt6_exception_bucket *bucket;
cc5c073a 1656 struct fib6_info *f6i = res->f6i;
35732d01
WW		 1657 struct in6_addr *src_key = NULL;
1658 struct rt6_exception *rt6_ex;
cc5c073a 1659 struct fib6_nh *nh = res->nh;
a00df2ca 1660 int max_depth;
35732d01
WW		 1661 int err = 0;
1662
35732d01
WW		 1663 spin_lock_bh(&rt6_exception_lock);
1664
cc5c073a
DA		 1665 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1666 lockdep_is_held(&rt6_exception_lock));
35732d01
WW		 1667 if (!bucket) {
1668 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1669 GFP_ATOMIC);
1670 if (!bucket) {
1671 err = -ENOMEM;
1672 goto out;
1673 }
cc5c073a
DA		 1674 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1675 } else if (fib6_nh_excptn_bucket_flushed(bucket)) {
1676 err = -EINVAL;
1677 goto out;
35732d01
WW		 1678 }
1679
1680#ifdef CONFIG_IPV6_SUBTREES
5012f0a5 1681 /* fib6_src.plen != 0 indicates f6i is in subtree
35732d01 1682 * and exception table is indexed by a hash of
5012f0a5 1683 * both fib6_dst and fib6_src.
35732d01 1684 * Otherwise, the exception table is indexed by
5012f0a5 1685 * a hash of only fib6_dst.
35732d01 1686 */
5012f0a5 1687 if (f6i->fib6_src.plen)
35732d01
WW		 1688 src_key = &nrt->rt6i_src.addr;
1689#endif
5012f0a5 1690 /* rt6_mtu_change() might lower mtu on f6i.
f5bbe7ee 1691 * Only insert this exception route if its mtu
5012f0a5 1692 * is less than f6i's mtu value.
f5bbe7ee 1693 */
b748f260 1694 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
f5bbe7ee
WW		 1695 err = -EINVAL;
1696 goto out;
1697 }
60006a48 1698
35732d01
WW		 1699 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1700 src_key);
1701 if (rt6_ex)
1702 rt6_remove_exception(bucket, rt6_ex);
1703
1704 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1705 if (!rt6_ex) {
1706 err = -ENOMEM;
1707 goto out;
1708 }
1709 rt6_ex->rt6i = nrt;
1710 rt6_ex->stamp = jiffies;
35732d01
WW		 1711 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1712 bucket->depth++;
81eb8447 1713 net->ipv6.rt6_stats->fib_rt_cache++;
35732d01 1714
a00df2ca 1715 /* Randomize max depth to avoid some side channels attacks. */
8032bf12 1716 max_depth = FIB6_MAX_DEPTH + get_random_u32_below(FIB6_MAX_DEPTH);
a00df2ca 1717 while (bucket->depth > max_depth)
35732d01
WW		 1718 rt6_exception_remove_oldest(bucket);
1719
1720out:
1721 spin_unlock_bh(&rt6_exception_lock);
1722
1723 /* Update fn->fn_sernum to invalidate all cached dst */
b886d5f2 1724 if (!err) {
5012f0a5
DA		 1725 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1726 fib6_update_sernum(net, f6i);
1727 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
b886d5f2
PA		 1728 fib6_force_start_gc(net);
1729 }
35732d01
WW		 1730
1731 return err;
1732}
1733
c0b220cf 1734static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from)
35732d01
WW		 1735{
1736 struct rt6_exception_bucket *bucket;
1737 struct rt6_exception *rt6_ex;
1738 struct hlist_node *tmp;
1739 int i;
1740
1741 spin_lock_bh(&rt6_exception_lock);
35732d01 1742
cc5c073a 1743 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
35732d01
WW		 1744 if (!bucket)
1745 goto out;
1746
cc5c073a
DA		 1747 /* Prevent rt6_insert_exception() to recreate the bucket list */
1748 if (!from)
1749 fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock);
1750
35732d01 1751 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
cc5c073a
DA		 1752 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) {
1753 if (!from ||
1754 rcu_access_pointer(rt6_ex->rt6i->from) == from)
1755 rt6_remove_exception(bucket, rt6_ex);
1756 }
1757 WARN_ON_ONCE(!from && bucket->depth);
35732d01
WW		 1758 bucket++;
1759 }
35732d01
WW		 1760out:
1761 spin_unlock_bh(&rt6_exception_lock);
1762}
1763
e659ba31
DA		 1764static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
1765{
1766 struct fib6_info *f6i = arg;
1767
1768 fib6_nh_flush_exceptions(nh, f6i);
1769
1770 return 0;
1771}
1772
c0b220cf
DA		 1773void rt6_flush_exceptions(struct fib6_info *f6i)
1774{
e659ba31
DA		 1775 if (f6i->nh)
1776 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
1777 f6i);
1778 else
1779 fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
c0b220cf
DA		 1780}
1781
35732d01
WW		 1782/* Find cached rt in the hash table inside passed in rt
1783 * Caller has to hold rcu_read_lock()
1784 */
7e4b5128 1785static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
510e2ced
WW		 1786 const struct in6_addr *daddr,
1787 const struct in6_addr *saddr)
35732d01 1788{
510e2ced 1789 const struct in6_addr *src_key = NULL;
35732d01 1790 struct rt6_exception_bucket *bucket;
35732d01 1791 struct rt6_exception *rt6_ex;
7e4b5128 1792 struct rt6_info *ret = NULL;
35732d01 1793
35732d01 1794#ifdef CONFIG_IPV6_SUBTREES
7e4b5128 1795 /* fib6i_src.plen != 0 indicates f6i is in subtree
35732d01 1796 * and exception table is indexed by a hash of
7e4b5128 1797 * both fib6_dst and fib6_src.
510e2ced
WW		 1798 * However, the src addr used to create the hash
1799 * might not be exactly the passed in saddr which
1800 * is a /128 addr from the flow.
1801 * So we need to use f6i->fib6_src to redo lookup
1802 * if the passed in saddr does not find anything.
1803 * (See the logic in ip6_rt_cache_alloc() on how
1804 * rt->rt6i_src is updated.)
35732d01 1805 */
7e4b5128 1806 if (res->f6i->fib6_src.plen)
35732d01 1807 src_key = saddr;
510e2ced 1808find_ex:
35732d01 1809#endif
cc5c073a 1810 bucket = fib6_nh_get_excptn_bucket(res->nh, NULL);
35732d01
WW		 1811 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1812
1813 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
7e4b5128 1814 ret = rt6_ex->rt6i;
35732d01 1815
510e2ced
WW		 1816#ifdef CONFIG_IPV6_SUBTREES
1817 /* Use fib6_src as src_key and redo lookup */
1818 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1819 src_key = &res->f6i->fib6_src.addr;
1820 goto find_ex;
1821 }
1822#endif
1823
7e4b5128 1824 return ret;
35732d01
WW		 1825}
1826
1827/* Remove the passed in cached rt from the hash table that contains it */
cc5c073a 1828static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
c0b220cf 1829 const struct rt6_info *rt)
35732d01 1830{
c0b220cf 1831 const struct in6_addr *src_key = NULL;
35732d01 1832 struct rt6_exception_bucket *bucket;
35732d01
WW		 1833 struct rt6_exception *rt6_ex;
1834 int err;
1835
cc5c073a 1836 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
35732d01
WW		 1837 return -ENOENT;
1838
1839 spin_lock_bh(&rt6_exception_lock);
cc5c073a
DA		 1840 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1841
35732d01 1842#ifdef CONFIG_IPV6_SUBTREES
cc5c073a
DA		 1843 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1844 * and exception table is indexed by a hash of
1845 * both rt6i_dst and rt6i_src.
35732d01
WW		 1846 * Otherwise, the exception table is indexed by
1847 * a hash of only rt6i_dst.
1848 */
c0b220cf 1849 if (plen)
35732d01
WW		 1850 src_key = &rt->rt6i_src.addr;
1851#endif
1852 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1853 &rt->rt6i_dst.addr,
1854 src_key);
1855 if (rt6_ex) {
1856 rt6_remove_exception(bucket, rt6_ex);
1857 err = 0;
1858 } else {
1859 err = -ENOENT;
1860 }
1861
1862 spin_unlock_bh(&rt6_exception_lock);
1863 return err;
1864}
1865
e659ba31
DA		 1866struct fib6_nh_excptn_arg {
1867 struct rt6_info *rt;
1868 int plen;
1869};
1870
1871static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
1872{
1873 struct fib6_nh_excptn_arg *arg = _arg;
1874 int err;
1875
1876 err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
1877 if (err == 0)
1878 return 1;
1879
1880 return 0;
1881}
1882
c0b220cf
DA		 1883static int rt6_remove_exception_rt(struct rt6_info *rt)
1884{
1885 struct fib6_info *from;
1886
1887 from = rcu_dereference(rt->from);
cc5c073a 1888 if (!from || !(rt->rt6i_flags & RTF_CACHE))
c0b220cf
DA		 1889 return -EINVAL;
1890
e659ba31
DA		 1891 if (from->nh) {
1892 struct fib6_nh_excptn_arg arg = {
1893 .rt = rt,
1894 .plen = from->fib6_src.plen
1895 };
1896 int rc;
1897
1898 /* rc = 1 means an entry was found */
1899 rc = nexthop_for_each_fib6_nh(from->nh,
1900 rt6_nh_remove_exception_rt,
1901 &arg);
1902 return rc ? 0 : -ENOENT;
1903 }
1904
1cf844c7 1905 return fib6_nh_remove_exception(from->fib6_nh,
cc5c073a 1906 from->fib6_src.plen, rt);
c0b220cf
DA		 1907}
1908
35732d01
WW		 1909/* Find rt6_ex which contains the passed in rt cache and
1910 * refresh its stamp
1911 */
cc5c073a 1912static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
c0b220cf 1913 const struct rt6_info *rt)
35732d01 1914{
c0b220cf 1915 const struct in6_addr *src_key = NULL;
35732d01 1916 struct rt6_exception_bucket *bucket;
35732d01 1917 struct rt6_exception *rt6_ex;
193f3685 1918
cc5c073a 1919 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
35732d01 1920#ifdef CONFIG_IPV6_SUBTREES
cc5c073a
DA		 1921 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1922 * and exception table is indexed by a hash of
1923 * both rt6i_dst and rt6i_src.
35732d01
WW		 1924 * Otherwise, the exception table is indexed by
1925 * a hash of only rt6i_dst.
1926 */
c0b220cf 1927 if (plen)
35732d01
WW		 1928 src_key = &rt->rt6i_src.addr;
1929#endif
cc5c073a 1930 rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key);
35732d01
WW		 1931 if (rt6_ex)
1932 rt6_ex->stamp = jiffies;
c0b220cf
DA		 1933}
1934
e659ba31
DA		 1935struct fib6_nh_match_arg {
1936 const struct net_device *dev;
1937 const struct in6_addr *gw;
1938 struct fib6_nh *match;
1939};
1940
1941/* determine if fib6_nh has given device and gateway */
1942static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
1943{
1944 struct fib6_nh_match_arg *arg = _arg;
1945
1946 if (arg->dev != nh->fib_nh_dev ||
1947 (arg->gw && !nh->fib_nh_gw_family) ||
1948 (!arg->gw && nh->fib_nh_gw_family) ||
1949 (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
1950 return 0;
1951
1952 arg->match = nh;
1953
1954 /* found a match, break the loop */
1955 return 1;
1956}
1957
c0b220cf
DA		 1958static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1959{
1960 struct fib6_info *from;
e659ba31 1961 struct fib6_nh *fib6_nh;
35732d01 1962
c0b220cf
DA		 1963 rcu_read_lock();
1964
1965 from = rcu_dereference(rt->from);
1966 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1967 goto unlock;
1968
e659ba31
DA		 1969 if (from->nh) {
1970 struct fib6_nh_match_arg arg = {
1971 .dev = rt->dst.dev,
1972 .gw = &rt->rt6i_gateway,
1973 };
1974
1975 nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
1976
1977 if (!arg.match)
cff6a327 1978 goto unlock;
e659ba31
DA		 1979 fib6_nh = arg.match;
1980 } else {
1981 fib6_nh = from->fib6_nh;
1982 }
1983 fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
193f3685 1984unlock:
35732d01
WW		 1985 rcu_read_unlock();
1986}
1987
e9fa1495
SB		 1988static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1989 struct rt6_info *rt, int mtu)
1990{
1991 /* If the new MTU is lower than the route PMTU, this new MTU will be the
1992 * lowest MTU in the path: always allow updating the route PMTU to
1993 * reflect PMTU decreases.
1994 *
1995 * If the new MTU is higher, and the route PMTU is equal to the local
1996 * MTU, this means the old MTU is the lowest in the path, so allow
1997 * updating it: if other nodes now have lower MTUs, PMTU discovery will
1998 * handle this.
1999 */
2000
2001 if (dst_mtu(&rt->dst) >= mtu)
2002 return true;
2003
2004 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
2005 return true;
2006
2007 return false;
2008}
2009
2010static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
cc5c073a 2011 const struct fib6_nh *nh, int mtu)
f5bbe7ee
WW		 2012{
2013 struct rt6_exception_bucket *bucket;
2014 struct rt6_exception *rt6_ex;
2015 int i;
2016
cc5c073a 2017 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
e9fa1495
SB		 2018 if (!bucket)
2019 return;
2020
2021 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2022 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
2023 struct rt6_info *entry = rt6_ex->rt6i;
2024
2025 /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected
d4ead6b3 2026 * route), the metrics of its rt->from have already
e9fa1495
SB		 2027 * been updated.
2028 */
d4ead6b3 2029 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
e9fa1495 2030 rt6_mtu_change_route_allowed(idev, entry, mtu))
d4ead6b3 2031 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
f5bbe7ee 2032 }
e9fa1495 2033 bucket++;
f5bbe7ee
WW		 2034 }
2035}
2036
b16cb459
WW		 2037#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2038
cc5c073a
DA		 2039static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh,
2040 const struct in6_addr *gateway)
b16cb459
WW		 2041{
2042 struct rt6_exception_bucket *bucket;
2043 struct rt6_exception *rt6_ex;
2044 struct hlist_node *tmp;
2045 int i;
2046
cc5c073a 2047 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
b16cb459
WW		 2048 return;
2049
2050 spin_lock_bh(&rt6_exception_lock);
cc5c073a 2051 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
b16cb459
WW		 2052 if (bucket) {
2053 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2054 hlist_for_each_entry_safe(rt6_ex, tmp,
2055 &bucket->chain, hlist) {
2056 struct rt6_info *entry = rt6_ex->rt6i;
2057
2058 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
2059 RTF_CACHE_GATEWAY &&
2060 ipv6_addr_equal(gateway,
2061 &entry->rt6i_gateway)) {
2062 rt6_remove_exception(bucket, rt6_ex);
2063 }
2064 }
2065 bucket++;
2066 }
2067 }
2068
2069 spin_unlock_bh(&rt6_exception_lock);
2070}
2071
c757faa8
WW		 2072static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
2073 struct rt6_exception *rt6_ex,
2074 struct fib6_gc_args *gc_args,
2075 unsigned long now)
2076{
2077 struct rt6_info *rt = rt6_ex->rt6i;
2078
1859bac0
PA		 2079 /* we are pruning and obsoleting aged-out and non gateway exceptions
2080 * even if others have still references to them, so that on next
2081 * dst_check() such references can be dropped.
2082 * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when
2083 * expired, independently from their aging, as per RFC 8201 section 4
2084 */
31afeb42
WW		 2085 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
2086 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
2087 RT6_TRACE("aging clone %p\n", rt);
2088 rt6_remove_exception(bucket, rt6_ex);
2089 return;
2090 }
2091 } else if (time_after(jiffies, rt->dst.expires)) {
2092 RT6_TRACE("purging expired route %p\n", rt);
c757faa8
WW		 2093 rt6_remove_exception(bucket, rt6_ex);
2094 return;
31afeb42
WW		 2095 }
2096
2097 if (rt->rt6i_flags & RTF_GATEWAY) {
c757faa8 2098 struct neighbour *neigh;
c757faa8 2099
1bfa26ff 2100 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
1bfa26ff 2101
b7a320c3 2102 if (!(neigh && (neigh->flags & NTF_ROUTER))) {
c757faa8
WW		 2103 RT6_TRACE("purging route %p via non-router but gateway\n",
2104 rt);
2105 rt6_remove_exception(bucket, rt6_ex);
2106 return;
2107 }
2108 }
31afeb42 2109
c757faa8
WW		 2110 gc_args->more++;
2111}
2112
cc5c073a 2113static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
c0b220cf
DA		 2114 struct fib6_gc_args *gc_args,
2115 unsigned long now)
c757faa8
WW		 2116{
2117 struct rt6_exception_bucket *bucket;
2118 struct rt6_exception *rt6_ex;
2119 struct hlist_node *tmp;
2120 int i;
2121
cc5c073a 2122 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
c757faa8
WW		 2123 return;
2124
1bfa26ff
ED		 2125 rcu_read_lock_bh();
2126 spin_lock(&rt6_exception_lock);
cc5c073a 2127 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
c757faa8
WW		 2128 if (bucket) {
2129 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2130 hlist_for_each_entry_safe(rt6_ex, tmp,
2131 &bucket->chain, hlist) {
2132 rt6_age_examine_exception(bucket, rt6_ex,
2133 gc_args, now);
2134 }
2135 bucket++;
2136 }
2137 }
1bfa26ff
ED		 2138 spin_unlock(&rt6_exception_lock);
2139 rcu_read_unlock_bh();
c757faa8
WW		 2140}
2141
e659ba31
DA		 2142struct fib6_nh_age_excptn_arg {
2143 struct fib6_gc_args *gc_args;
2144 unsigned long now;
2145};
2146
2147static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
2148{
2149 struct fib6_nh_age_excptn_arg *arg = _arg;
2150
2151 fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
2152 return 0;
2153}
2154
cc5c073a 2155void rt6_age_exceptions(struct fib6_info *f6i,
c0b220cf
DA		 2156 struct fib6_gc_args *gc_args,
2157 unsigned long now)
2158{
e659ba31
DA		 2159 if (f6i->nh) {
2160 struct fib6_nh_age_excptn_arg arg = {
2161 .gc_args = gc_args,
2162 .now = now
2163 };
2164
2165 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
2166 &arg);
2167 } else {
2168 fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
2169 }
c0b220cf
DA		 2170}
2171
1d053da9 2172/* must be called with rcu lock held */
effda4dd
DA		 2173int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
2174 struct flowi6 *fl6, struct fib6_result *res, int strict)
1da177e4 2175{
367efcb9 2176 struct fib6_node *fn, *saved_fn;
1da177e4 2177
6454743b 2178 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 2179 saved_fn = fn;
1da177e4 2180
a3c00e46 2181redo_rt6_select:
effda4dd
DA		 2182 rt6_select(net, fn, oif, res, strict);
2183 if (res->f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 2184 fn = fib6_backtrack(fn, &fl6->saddr);
2185 if (fn)
2186 goto redo_rt6_select;
367efcb9
MKL		 2187 else if (strict & RT6_LOOKUP_F_REACHABLE) {
2188 /* also consider unreachable route */
2189 strict &= ~RT6_LOOKUP_F_REACHABLE;
2190 fn = saved_fn;
2191 goto redo_rt6_select;
367efcb9 2192 }
a3c00e46
MKL		 2193 }
2194
effda4dd 2195 trace_fib6_table_lookup(net, res, table, fl6);
fb9de91e 2196
effda4dd 2197 return 0;
1d053da9
DA		 2198}
2199
2200struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
2201 int oif, struct flowi6 *fl6,
2202 const struct sk_buff *skb, int flags)
2203{
b1d40991 2204 struct fib6_result res = {};
0e09edcc 2205 struct rt6_info *rt = NULL;
1d053da9
DA		 2206 int strict = 0;
2207
0e09edcc
WW		 2208 WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) &&
2209 !rcu_read_lock_held());
2210
1d053da9
DA		 2211 strict |= flags & RT6_LOOKUP_F_IFACE;
2212 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
2213 if (net->ipv6.devconf_all->forwarding == 0)
2214 strict |= RT6_LOOKUP_F_REACHABLE;
2215
2216 rcu_read_lock();
2217
effda4dd 2218 fib6_table_lookup(net, table, oif, fl6, &res, strict);
0e09edcc
WW		 2219 if (res.f6i == net->ipv6.fib6_null_entry)
2220 goto out;
23fb93a4 2221
b1d40991 2222 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
d83009d4 2223
23fb93a4 2224 /*Search through exception table */
7e4b5128 2225 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
23fb93a4 2226 if (rt) {
0e09edcc 2227 goto out;
3da59bd9 2228 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
b1d40991 2229 !res.nh->fib_nh_gw_family)) {
3da59bd9
MKL		 2230 /* Create a RTF_CACHE clone which will not be
2231 * owned by the fib6 tree. It is for the special case where
2232 * the daddr in the skb during the neighbor look-up is different
2233 * from the fl6->daddr used to look-up route here.
2234 */
0e09edcc 2235 rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
c71099ac 2236
0e09edcc
WW		 2237 if (rt) {
2238 /* 1 refcnt is taken during ip6_rt_cache_alloc().
2239 * As rt6_uncached_list_add() does not consume refcnt,
2240 * this refcnt is always returned to the caller even
2241 * if caller sets RT6_LOOKUP_F_DST_NOREF flag.
1cfb71ee 2242 */
0e09edcc 2243 rt6_uncached_list_add(rt);
0e09edcc 2244 rcu_read_unlock();
b811580d 2245
0e09edcc
WW		 2246 return rt;
2247 }
d52d3997
MKL		 2248 } else {
2249 /* Get a percpu copy */
951f788a 2250 local_bh_disable();
0e09edcc 2251 rt = rt6_get_pcpu_route(&res);
d52d3997 2252
0e09edcc
WW		 2253 if (!rt)
2254 rt = rt6_make_pcpu_route(net, &res);
93531c67 2255
951f788a 2256 local_bh_enable();
d52d3997 2257 }
0e09edcc
WW		 2258out:
2259 if (!rt)
2260 rt = net->ipv6.ip6_null_entry;
2261 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
2262 ip6_hold_safe(net, &rt);
2263 rcu_read_unlock();
2264
2265 return rt;
1da177e4 2266}
9ff74384 2267EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 2268
55cced4f 2269INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net,
b75cc8f9
DA		 2270 struct fib6_table *table,
2271 struct flowi6 *fl6,
2272 const struct sk_buff *skb,
2273 int flags)
4acad72d 2274{
b75cc8f9 2275 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
4acad72d
PE		 2276}
2277
d409b847
MB		 2278struct dst_entry *ip6_route_input_lookup(struct net *net,
2279 struct net_device *dev,
b75cc8f9
DA		 2280 struct flowi6 *fl6,
2281 const struct sk_buff *skb,
2282 int flags)
72331bc0
SL		 2283{
2284 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
2285 flags |= RT6_LOOKUP_F_IFACE;
2286
b75cc8f9 2287 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
72331bc0 2288}
d409b847 2289EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
72331bc0 2290
23aebdac 2291static void ip6_multipath_l3_keys(const struct sk_buff *skb,
5e5d6fed
RP		 2292 struct flow_keys *keys,
2293 struct flow_keys *flkeys)
23aebdac
JS		 2294{
2295 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
2296 const struct ipv6hdr *key_iph = outer_iph;
5e5d6fed 2297 struct flow_keys *_flkeys = flkeys;
23aebdac
JS		 2298 const struct ipv6hdr *inner_iph;
2299 const struct icmp6hdr *icmph;
2300 struct ipv6hdr _inner_iph;
cea67a2d 2301 struct icmp6hdr _icmph;
23aebdac
JS		 2302
2303 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2304 goto out;
2305
cea67a2d
ED		 2306 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2307 sizeof(_icmph), &_icmph);
2308 if (!icmph)
2309 goto out;
2310
54074f1d 2311 if (!icmpv6_is_err(icmph->icmp6_type))
23aebdac
JS		 2312 goto out;
2313
2314 inner_iph = skb_header_pointer(skb,
2315 skb_transport_offset(skb) + sizeof(*icmph),
2316 sizeof(_inner_iph), &_inner_iph);
2317 if (!inner_iph)
2318 goto out;
2319
2320 key_iph = inner_iph;
5e5d6fed 2321 _flkeys = NULL;
23aebdac 2322out:
5e5d6fed
RP		 2323 if (_flkeys) {
2324 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2325 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2326 keys->tags.flow_label = _flkeys->tags.flow_label;
2327 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2328 } else {
2329 keys->addrs.v6addrs.src = key_iph->saddr;
2330 keys->addrs.v6addrs.dst = key_iph->daddr;
fa1be7e0 2331 keys->tags.flow_label = ip6_flowlabel(key_iph);
5e5d6fed
RP		 2332 keys->basic.ip_proto = key_iph->nexthdr;
2333 }
23aebdac
JS		 2334}
2335
73c2c5cb
IS		 2336static u32 rt6_multipath_custom_hash_outer(const struct net *net,
2337 const struct sk_buff *skb,
2338 bool *p_has_inner)
2339{
2340 u32 hash_fields = ip6_multipath_hash_fields(net);
2341 struct flow_keys keys, hash_keys;
2342
2343 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK))
2344 return 0;
2345
2346 memset(&hash_keys, 0, sizeof(hash_keys));
2347 skb_flow_dissect_flow_keys(skb, &keys, FLOW_DISSECTOR_F_STOP_AT_ENCAP);
2348
2349 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2350 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP)
2351 hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;
2352 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP)
2353 hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;
2354 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
2355 hash_keys.basic.ip_proto = keys.basic.ip_proto;
2356 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL)
2357 hash_keys.tags.flow_label = keys.tags.flow_label;
2358 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT)
2359 hash_keys.ports.src = keys.ports.src;
2360 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT)
2361 hash_keys.ports.dst = keys.ports.dst;
2362
2363 *p_has_inner = !!(keys.control.flags & FLOW_DIS_ENCAPSULATION);
2364 return flow_hash_from_keys(&hash_keys);
2365}
2366
2367static u32 rt6_multipath_custom_hash_inner(const struct net *net,
2368 const struct sk_buff *skb,
2369 bool has_inner)
2370{
2371 u32 hash_fields = ip6_multipath_hash_fields(net);
2372 struct flow_keys keys, hash_keys;
2373
2374 /* We assume the packet carries an encapsulation, but if none was
2375 * encountered during dissection of the outer flow, then there is no
2376 * point in calling the flow dissector again.
2377 */
2378 if (!has_inner)
2379 return 0;
2380
2381 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK))
2382 return 0;
2383
2384 memset(&hash_keys, 0, sizeof(hash_keys));
2385 skb_flow_dissect_flow_keys(skb, &keys, 0);
2386
2387 if (!(keys.control.flags & FLOW_DIS_ENCAPSULATION))
2388 return 0;
2389
2390 if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2391 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2392 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP)
2393 hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src;
2394 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP)
2395 hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst;
2396 } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2397 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2398 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP)
2399 hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;
2400 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP)
2401 hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;
2402 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL)
2403 hash_keys.tags.flow_label = keys.tags.flow_label;
2404 }
2405
2406 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO)
2407 hash_keys.basic.ip_proto = keys.basic.ip_proto;
2408 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT)
2409 hash_keys.ports.src = keys.ports.src;
2410 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
2411 hash_keys.ports.dst = keys.ports.dst;
2412
2413 return flow_hash_from_keys(&hash_keys);
2414}
2415
2416static u32 rt6_multipath_custom_hash_skb(const struct net *net,
2417 const struct sk_buff *skb)
2418{
2419 u32 mhash, mhash_inner;
2420 bool has_inner = true;
2421
2422 mhash = rt6_multipath_custom_hash_outer(net, skb, &has_inner);
2423 mhash_inner = rt6_multipath_custom_hash_inner(net, skb, has_inner);
2424
2425 return jhash_2words(mhash, mhash_inner, 0);
2426}
2427
2428static u32 rt6_multipath_custom_hash_fl6(const struct net *net,
2429 const struct flowi6 *fl6)
2430{
2431 u32 hash_fields = ip6_multipath_hash_fields(net);
2432 struct flow_keys hash_keys;
2433
2434 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK))
2435 return 0;
2436
2437 memset(&hash_keys, 0, sizeof(hash_keys));
2438 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2439 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP)
2440 hash_keys.addrs.v6addrs.src = fl6->saddr;
2441 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP)
2442 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2443 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
2444 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2445 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL)
2446 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2447 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT)
2448 hash_keys.ports.src = fl6->fl6_sport;
2449 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT)
2450 hash_keys.ports.dst = fl6->fl6_dport;
2451
2452 return flow_hash_from_keys(&hash_keys);
2453}
2454
23aebdac 2455/* if skb is set it will be used and fl6 can be NULL */
b4bac172
DA		 2456u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2457 const struct sk_buff *skb, struct flow_keys *flkeys)
23aebdac
JS		 2458{
2459 struct flow_keys hash_keys;
b95b6e07 2460 u32 mhash = 0;
23aebdac 2461
bbfa047a 2462 switch (ip6_multipath_hash_policy(net)) {
b4bac172
DA		 2463 case 0:
2464 memset(&hash_keys, 0, sizeof(hash_keys));
2465 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2466 if (skb) {
2467 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2468 } else {
2469 hash_keys.addrs.v6addrs.src = fl6->saddr;
2470 hash_keys.addrs.v6addrs.dst = fl6->daddr;
fa1be7e0 2471 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
b4bac172
DA		 2472 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2473 }
b95b6e07 2474 mhash = flow_hash_from_keys(&hash_keys);
b4bac172
DA		 2475 break;
2476 case 1:
2477 if (skb) {
2478 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2479 struct flow_keys keys;
2480
2481 /* short-circuit if we already have L4 hash present */
2482 if (skb->l4_hash)
2483 return skb_get_hash_raw(skb) >> 1;
2484
2485 memset(&hash_keys, 0, sizeof(hash_keys));
2486
13fdb940 2487 if (!flkeys) {
b4bac172
DA		 2488 skb_flow_dissect_flow_keys(skb, &keys, flag);
2489 flkeys = &keys;
2490 }
2491 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2492 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2493 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2494 hash_keys.ports.src = flkeys->ports.src;
2495 hash_keys.ports.dst = flkeys->ports.dst;
2496 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2497 } else {
2498 memset(&hash_keys, 0, sizeof(hash_keys));
2499 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2500 hash_keys.addrs.v6addrs.src = fl6->saddr;
2501 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2502 hash_keys.ports.src = fl6->fl6_sport;
2503 hash_keys.ports.dst = fl6->fl6_dport;
2504 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2505 }
b95b6e07 2506 mhash = flow_hash_from_keys(&hash_keys);
b4bac172 2507 break;
d8f74f09
SS		 2508 case 2:
2509 memset(&hash_keys, 0, sizeof(hash_keys));
2510 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2511 if (skb) {
2512 struct flow_keys keys;
2513
2514 if (!flkeys) {
2515 skb_flow_dissect_flow_keys(skb, &keys, 0);
2516 flkeys = &keys;
2517 }
2518
2519 /* Inner can be v4 or v6 */
2520 if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2521 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2522 hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;
2523 hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;
2524 } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2525 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2526 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2527 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2528 hash_keys.tags.flow_label = flkeys->tags.flow_label;
2529 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2530 } else {
2531 /* Same as case 0 */
2532 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2533 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2534 }
2535 } else {
2536 /* Same as case 0 */
2537 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2538 hash_keys.addrs.v6addrs.src = fl6->saddr;
2539 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2540 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2541 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2542 }
b95b6e07 2543 mhash = flow_hash_from_keys(&hash_keys);
d8f74f09 2544 break;
73c2c5cb
IS		 2545 case 3:
2546 if (skb)
2547 mhash = rt6_multipath_custom_hash_skb(net, skb);
2548 else
2549 mhash = rt6_multipath_custom_hash_fl6(net, fl6);
2550 break;
23aebdac
JS		 2551 }
2552
9a2a537a 2553 return mhash >> 1;
23aebdac
JS		 2554}
2555
67f415dd 2556/* Called with rcu held */
c71099ac
TG		 2557void ip6_route_input(struct sk_buff *skb)
2558{
b71d1d42 2559 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 2560 struct net *net = dev_net(skb->dev);
67f415dd 2561 int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF;
904af04d 2562 struct ip_tunnel_info *tun_info;
4c9483b2 2563 struct flowi6 fl6 = {
e0d56fdd 2564 .flowi6_iif = skb->dev->ifindex,
4c9483b2
DM		 2565 .daddr = iph->daddr,
2566 .saddr = iph->saddr,
6502ca52 2567 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 2568 .flowi6_mark = skb->mark,
2569 .flowi6_proto = iph->nexthdr,
c71099ac 2570 };
5e5d6fed 2571 struct flow_keys *flkeys = NULL, _flkeys;
adaa70bb 2572
904af04d 2573 tun_info = skb_tunnel_info(skb);
46fa062a 2574 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 2575 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
5e5d6fed
RP		 2576
2577 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2578 flkeys = &_flkeys;
2579
23aebdac 2580 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
b4bac172 2581 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
06e9d040 2582 skb_dst_drop(skb);
67f415dd
WW		 2583 skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev,
2584 &fl6, skb, flags));
c71099ac
TG		 2585}
2586
55cced4f 2587INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net,
b75cc8f9
DA		 2588 struct fib6_table *table,
2589 struct flowi6 *fl6,
2590 const struct sk_buff *skb,
2591 int flags)
1da177e4 2592{
b75cc8f9 2593 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
c71099ac
TG		 2594}
2595
90317bcd
GN		 2596static struct dst_entry *ip6_route_output_flags_noref(struct net *net,
2597 const struct sock *sk,
2598 struct flowi6 *fl6,
2599 int flags)
c71099ac 2600{
d46a9d67 2601 bool any_src;
c71099ac 2602
3ede0bbc
RS		 2603 if (ipv6_addr_type(&fl6->daddr) &
2604 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
4c1feac5
DA		 2605 struct dst_entry *dst;
2606
7d9e5f42 2607 /* This function does not take refcnt on the dst */
4c1feac5
DA		 2608 dst = l3mdev_link_scope_lookup(net, fl6);
2609 if (dst)
2610 return dst;
2611 }
ca254490 2612
1fb9489b 2613 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 2614
7d9e5f42 2615 flags |= RT6_LOOKUP_F_DST_NOREF;
d46a9d67 2616 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 2617 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 2618 (fl6->flowi6_oif && any_src))
77d16f45 2619 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 2620
d46a9d67 2621 if (!any_src)
adaa70bb 2622 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 2623 else if (sk)
2624 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 2625
b75cc8f9 2626 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
1da177e4 2627}
7d9e5f42
WW		 2628
2629struct dst_entry *ip6_route_output_flags(struct net *net,
2630 const struct sock *sk,
2631 struct flowi6 *fl6,
2632 int flags)
2633{
13fdb940
SK		 2634 struct dst_entry *dst;
2635 struct rt6_info *rt6;
7d9e5f42 2636
13fdb940
SK		 2637 rcu_read_lock();
2638 dst = ip6_route_output_flags_noref(net, sk, fl6, flags);
2639 rt6 = (struct rt6_info *)dst;
2640 /* For dst cached in uncached_list, refcnt is already taken. */
2641 if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) {
2642 dst = &net->ipv6.ip6_null_entry->dst;
2643 dst_hold(dst);
2644 }
2645 rcu_read_unlock();
7d9e5f42 2646
13fdb940 2647 return dst;
7d9e5f42 2648}
6f21c96a 2649EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 2650
2774c131 2651struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 2652{
5c1e6aa3 2653 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1dbe3252 2654 struct net_device *loopback_dev = net->loopback_dev;
14e50e57
DM		 2655 struct dst_entry *new = NULL;
2656
1dbe3252 2657 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
62cf27e5 2658 DST_OBSOLETE_DEAD, 0);
14e50e57 2659 if (rt) {
0a1f5962 2660 rt6_info_init(rt);
81eb8447 2661 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
8104891b 2662
0a1f5962 2663 new = &rt->dst;
14e50e57 2664 new->__use = 1;
352e512c 2665 new->input = dst_discard;
ede2059d 2666 new->output = dst_discard_out;
14e50e57 2667
0a1f5962 2668 dst_copy_metrics(new, &ort->dst);
14e50e57 2669
1dbe3252 2670 rt->rt6i_idev = in6_dev_get(loopback_dev);
4e3fd7a0 2671 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 2672 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 2673
2674 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2675#ifdef CONFIG_IPV6_SUBTREES
2676 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2677#endif
14e50e57
DM		 2678 }
2679
69ead7af
DM		 2680 dst_release(dst_orig);
2681 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 2682}
14e50e57 2683
1da177e4
LT		 2684/*
2685 * Destination cache support functions
2686 */
2687
8d1c802b 2688static bool fib6_check(struct fib6_info *f6i, u32 cookie)
4b32b5ad 2689{
93531c67
DA		 2690 u32 rt_cookie = 0;
2691
8ae86971 2692 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
93531c67
DA		 2693 return false;
2694
2695 if (fib6_check_expired(f6i))
2696 return false;
2697
2698 return true;
4b32b5ad
MKL		 2699}
2700
a68886a6
DA		 2701static struct dst_entry *rt6_check(struct rt6_info *rt,
2702 struct fib6_info *from,
2703 u32 cookie)
3da59bd9 2704{
36143645 2705 u32 rt_cookie = 0;
c5cff856 2706
49d05fe2 2707 if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
93531c67 2708 rt_cookie != cookie)
3da59bd9
MKL		 2709 return NULL;
2710
2711 if (rt6_check_expired(rt))
2712 return NULL;
2713
2714 return &rt->dst;
2715}
2716
a68886a6
DA		 2717static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2718 struct fib6_info *from,
2719 u32 cookie)
3da59bd9 2720{
5973fb1e
MKL		 2721 if (!__rt6_check_expired(rt) &&
2722 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
a68886a6 2723 fib6_check(from, cookie))
3da59bd9
MKL		 2724 return &rt->dst;
2725 else
2726 return NULL;
2727}
2728
bbd807df
BV		 2729INDIRECT_CALLABLE_SCOPE struct dst_entry *ip6_dst_check(struct dst_entry *dst,
2730 u32 cookie)
1da177e4 2731{
a87b7dc9 2732 struct dst_entry *dst_ret;
a68886a6 2733 struct fib6_info *from;
1da177e4
LT		 2734 struct rt6_info *rt;
2735
a87b7dc9
DA		 2736 rt = container_of(dst, struct rt6_info, dst);
2737
8f34e53b
DA		 2738 if (rt->sernum)
2739 return rt6_is_valid(rt) ? dst : NULL;
2740
a87b7dc9 2741 rcu_read_lock();
1da177e4 2742
6f3118b5
ND		 2743 /* All IPV6 dsts are created with ->obsolete set to the value
2744 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
2745 * into this function always.
2746 */
e3bc10bd 2747
a68886a6 2748 from = rcu_dereference(rt->from);
4b32b5ad 2749
a68886a6
DA		 2750 if (from && (rt->rt6i_flags & RTF_PCPU ||
2751 unlikely(!list_empty(&rt->rt6i_uncached))))
2752 dst_ret = rt6_dst_from_check(rt, from, cookie);
3da59bd9 2753 else
a68886a6 2754 dst_ret = rt6_check(rt, from, cookie);
a87b7dc9
DA		 2755
2756 rcu_read_unlock();
2757
2758 return dst_ret;
1da177e4 2759}
9c97921a 2760EXPORT_INDIRECT_CALLABLE(ip6_dst_check);
1da177e4
LT		 2761
2762static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2763{
2764 struct rt6_info *rt = (struct rt6_info *) dst;
2765
2766 if (rt) {
54c1a859 2767 if (rt->rt6i_flags & RTF_CACHE) {
c3c14da0 2768 rcu_read_lock();
54c1a859 2769 if (rt6_check_expired(rt)) {
93531c67 2770 rt6_remove_exception_rt(rt);
54c1a859
YH		 2771 dst = NULL;
2772 }
c3c14da0 2773 rcu_read_unlock();
54c1a859 2774 } else {
1da177e4 2775 dst_release(dst);
54c1a859
YH		 2776 dst = NULL;
2777 }
1da177e4 2778 }
54c1a859 2779 return dst;
1da177e4
LT		 2780}
2781
2782static void ip6_link_failure(struct sk_buff *skb)
2783{
2784 struct rt6_info *rt;
2785
3ffe533c 2786 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 2787
adf30907 2788 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 2789 if (rt) {
8a14e46f 2790 rcu_read_lock();
1eb4f758 2791 if (rt->rt6i_flags & RTF_CACHE) {
761f6026 2792 rt6_remove_exception_rt(rt);
c5cff856 2793 } else {
a68886a6 2794 struct fib6_info *from;
c5cff856
WW		 2795 struct fib6_node *fn;
2796
a68886a6
DA		 2797 from = rcu_dereference(rt->from);
2798 if (from) {
2799 fn = rcu_dereference(from->fib6_node);
2800 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
aafc2e32 2801 WRITE_ONCE(fn->fn_sernum, -1);
a68886a6 2802 }
1eb4f758 2803 }
8a14e46f 2804 rcu_read_unlock();
1da177e4
LT		 2805 }
2806}
2807
6a3e030f
DA		 2808static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2809{
a68886a6
DA		 2810 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2811 struct fib6_info *from;
2812
2813 rcu_read_lock();
2814 from = rcu_dereference(rt0->from);
2815 if (from)
2816 rt0->dst.expires = from->expires;
2817 rcu_read_unlock();
2818 }
6a3e030f
DA		 2819
2820 dst_set_expires(&rt0->dst, timeout);
2821 rt0->rt6i_flags |= RTF_EXPIRES;
2822}
2823
45e4fd26
MKL		 2824static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2825{
2826 struct net *net = dev_net(rt->dst.dev);
2827
d4ead6b3 2828 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
45e4fd26 2829 rt->rt6i_flags |= RTF_MODIFIED;
45e4fd26
MKL		 2830 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2831}
2832
0d3f6d29
MKL		 2833static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2834{
2835 return !(rt->rt6i_flags & RTF_CACHE) &&
1490ed2a 2836 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
0d3f6d29
MKL		 2837}
2838
45e4fd26 2839static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
bd085ef6
HL		 2840 const struct ipv6hdr *iph, u32 mtu,
2841 bool confirm_neigh)
1da177e4 2842{
0dec879f 2843 const struct in6_addr *daddr, *saddr;
67ba4152 2844 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 2845
09454fd0
MŻ		 2846 /* Note: do *NOT* check dst_metric_locked(dst, RTAX_MTU)
2847 * IPv6 pmtu discovery isn't optional, so 'mtu lock' cannot disable it.
2848 * [see also comment in rt6_mtu_change_route()]
2849 */
19bda36c 2850
0dec879f
JA		 2851 if (iph) {
2852 daddr = &iph->daddr;
2853 saddr = &iph->saddr;
2854 } else if (sk) {
2855 daddr = &sk->sk_v6_daddr;
2856 saddr = &inet6_sk(sk)->saddr;
2857 } else {
2858 daddr = NULL;
2859 saddr = NULL;
2860 }
bd085ef6
HL		 2861
2862 if (confirm_neigh)
2863 dst_confirm_neigh(dst, daddr);
2864
4a65dff8
GK		 2865 if (mtu < IPV6_MIN_MTU)
2866 return;
45e4fd26
MKL		 2867 if (mtu >= dst_mtu(dst))
2868 return;
9d289715 2869
0d3f6d29 2870 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26 2871 rt6_do_update_pmtu(rt6, mtu);
2b760fcf
WW		 2872 /* update rt6_ex->stamp for cache */
2873 if (rt6->rt6i_flags & RTF_CACHE)
2874 rt6_update_exception_stamp_rt(rt6);
0dec879f 2875 } else if (daddr) {
85bd05de 2876 struct fib6_result res = {};
45e4fd26
MKL		 2877 struct rt6_info *nrt6;
2878
4d85cd0c 2879 rcu_read_lock();
85bd05de 2880 res.f6i = rcu_dereference(rt6->from);
43a4b60d
DA		 2881 if (!res.f6i)
2882 goto out_unlock;
2883
7d21fec9
DA		 2884 res.fib6_flags = res.f6i->fib6_flags;
2885 res.fib6_type = res.f6i->fib6_type;
2886
2d44234b
DA		 2887 if (res.f6i->nh) {
2888 struct fib6_nh_match_arg arg = {
2889 .dev = dst->dev,
2890 .gw = &rt6->rt6i_gateway,
2891 };
2892
2893 nexthop_for_each_fib6_nh(res.f6i->nh,
2894 fib6_nh_find_match, &arg);
2895
2896 /* fib6_info uses a nexthop that does not have fib6_nh
2897 * using the dst->dev + gw. Should be impossible.
2898 */
43a4b60d
DA		 2899 if (!arg.match)
2900 goto out_unlock;
2d44234b
DA		 2901
2902 res.nh = arg.match;
2903 } else {
2904 res.nh = res.f6i->fib6_nh;
2905 }
2906
85bd05de 2907 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
45e4fd26
MKL		 2908 if (nrt6) {
2909 rt6_do_update_pmtu(nrt6, mtu);
5012f0a5 2910 if (rt6_insert_exception(nrt6, &res))
2b760fcf 2911 dst_release_immediate(&nrt6->dst);
45e4fd26 2912 }
43a4b60d 2913out_unlock:
a68886a6 2914 rcu_read_unlock();
1da177e4
LT		 2915 }
2916}
2917
45e4fd26 2918static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
bd085ef6
HL		 2919 struct sk_buff *skb, u32 mtu,
2920 bool confirm_neigh)
45e4fd26 2921{
bd085ef6
HL		 2922 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu,
2923 confirm_neigh);
45e4fd26
MKL		 2924}
2925
42ae66c8 2926void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
e2d118a1 2927 int oif, u32 mark, kuid_t uid)
81aded24
DM		 2928{
2929 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2930 struct dst_entry *dst;
dc92095d
MŻ		 2931 struct flowi6 fl6 = {
2932 .flowi6_oif = oif,
2933 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2934 .daddr = iph->daddr,
2935 .saddr = iph->saddr,
2936 .flowlabel = ip6_flowinfo(iph),
2937 .flowi6_uid = uid,
2938 };
81aded24
DM		 2939
2940 dst = ip6_route_output(net, NULL, &fl6);
2941 if (!dst->error)
bd085ef6 2942 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true);
81aded24
DM		 2943 dst_release(dst);
2944}
2945EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2946
2947void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2948{
7ddacfa5 2949 int oif = sk->sk_bound_dev_if;
33c162a9
MKL		 2950 struct dst_entry *dst;
2951
7ddacfa5
DA		 2952 if (!oif && skb->dev)
2953 oif = l3mdev_master_ifindex(skb->dev);
2954
2955 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
33c162a9
MKL		 2956
2957 dst = __sk_dst_get(sk);
2958 if (!dst || !dst->obsolete ||
2959 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2960 return;
2961
2962 bh_lock_sock(sk);
2963 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2964 ip6_datagram_dst_update(sk, false);
2965 bh_unlock_sock(sk);
81aded24
DM		 2966}
2967EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2968
7d6850f7
AK		 2969void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2970 const struct flowi6 *fl6)
2971{
2972#ifdef CONFIG_IPV6_SUBTREES
2973 struct ipv6_pinfo *np = inet6_sk(sk);
2974#endif
2975
2976 ip6_dst_store(sk, dst,
2977 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2978 &sk->sk_v6_daddr : NULL,
2979#ifdef CONFIG_IPV6_SUBTREES
2980 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2981 &np->saddr :
2982#endif
2983 NULL);
2984}
2985
9b6b35ab 2986static bool ip6_redirect_nh_match(const struct fib6_result *res,
0b34eb00
DA		 2987 struct flowi6 *fl6,
2988 const struct in6_addr *gw,
2989 struct rt6_info **ret)
2990{
9b6b35ab
DA		 2991 const struct fib6_nh *nh = res->nh;
2992
0b34eb00
DA		 2993 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2994 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2995 return false;
2996
2997 /* rt_cache's gateway might be different from its 'parent'
2998 * in the case of an ip redirect.
2999 * So we keep searching in the exception table if the gateway
3000 * is different.
3001 */
3002 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
3003 struct rt6_info *rt_cache;
3004
9b6b35ab 3005 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
0b34eb00
DA		 3006 if (rt_cache &&
3007 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
3008 *ret = rt_cache;
3009 return true;
3010 }
3011 return false;
3012 }
3013 return true;
3014}
3015
c55c8988
DA		 3016struct fib6_nh_rd_arg {
3017 struct fib6_result *res;
3018 struct flowi6 *fl6;
3019 const struct in6_addr *gw;
3020 struct rt6_info **ret;
3021};
3022
3023static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg)
3024{
3025 struct fib6_nh_rd_arg *arg = _arg;
3026
3027 arg->res->nh = nh;
3028 return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret);
3029}
3030
b55b76b2
DJ		 3031/* Handle redirects */
3032struct ip6rd_flowi {
3033 struct flowi6 fl6;
3034 struct in6_addr gateway;
3035};
3036
55cced4f 3037INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net,
b55b76b2
DJ		 3038 struct fib6_table *table,
3039 struct flowi6 *fl6,
b75cc8f9 3040 const struct sk_buff *skb,
b55b76b2
DJ		 3041 int flags)
3042{
3043 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
0b34eb00 3044 struct rt6_info *ret = NULL;
9b6b35ab 3045 struct fib6_result res = {};
c55c8988
DA		 3046 struct fib6_nh_rd_arg arg = {
3047 .res = &res,
3048 .fl6 = fl6,
3049 .gw = &rdfl->gateway,
3050 .ret = &ret
3051 };
8d1c802b 3052 struct fib6_info *rt;
b55b76b2
DJ		 3053 struct fib6_node *fn;
3054
3055 /* Get the "current" route for this destination and
67c408cf 3056 * check if the redirect has come from appropriate router.
b55b76b2
DJ		 3057 *
3058 * RFC 4861 specifies that redirects should only be
3059 * accepted if they come from the nexthop to the target.
3060 * Due to the way the routes are chosen, this notion
3061 * is a bit fuzzy and one might need to check all possible
3062 * routes.
3063 */
3064
66f5d6ce 3065 rcu_read_lock();
6454743b 3066 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
b55b76b2 3067restart:
66f5d6ce 3068 for_each_fib6_node_rt_rcu(fn) {
9b6b35ab 3069 res.f6i = rt;
14895687 3070 if (fib6_check_expired(rt))
b55b76b2 3071 continue;
93c2fb25 3072 if (rt->fib6_flags & RTF_REJECT)
b55b76b2 3073 break;
c55c8988
DA		 3074 if (unlikely(rt->nh)) {
3075 if (nexthop_is_blackhole(rt->nh))
3076 continue;
3077 /* on match, res->nh is filled in and potentially ret */
3078 if (nexthop_for_each_fib6_nh(rt->nh,
3079 fib6_nh_redirect_match,
3080 &arg))
3081 goto out;
3082 } else {
3083 res.nh = rt->fib6_nh;
3084 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway,
3085 &ret))
3086 goto out;
3087 }
b55b76b2
DJ		 3088 }
3089
3090 if (!rt)
421842ed 3091 rt = net->ipv6.fib6_null_entry;
93c2fb25 3092 else if (rt->fib6_flags & RTF_REJECT) {
23fb93a4 3093 ret = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 3094 goto out;
3095 }
3096
421842ed 3097 if (rt == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 3098 fn = fib6_backtrack(fn, &fl6->saddr);
3099 if (fn)
3100 goto restart;
b55b76b2 3101 }
a3c00e46 3102
9b6b35ab 3103 res.f6i = rt;
1cf844c7 3104 res.nh = rt->fib6_nh;
b0a1ba59 3105out:
7d21fec9 3106 if (ret) {
10585b43 3107 ip6_hold_safe(net, &ret);
7d21fec9
DA		 3108 } else {
3109 res.fib6_flags = res.f6i->fib6_flags;
3110 res.fib6_type = res.f6i->fib6_type;
9b6b35ab 3111 ret = ip6_create_rt_rcu(&res);
7d21fec9 3112 }
b55b76b2 3113
66f5d6ce 3114 rcu_read_unlock();
b55b76b2 3115
8ff2e5b2 3116 trace_fib6_table_lookup(net, &res, table, fl6);
23fb93a4 3117 return ret;
b55b76b2
DJ		 3118};
3119
3120static struct dst_entry *ip6_route_redirect(struct net *net,
b75cc8f9
DA		 3121 const struct flowi6 *fl6,
3122 const struct sk_buff *skb,
3123 const struct in6_addr *gateway)
b55b76b2
DJ		 3124{
3125 int flags = RT6_LOOKUP_F_HAS_SADDR;
3126 struct ip6rd_flowi rdfl;
3127
3128 rdfl.fl6 = *fl6;
3129 rdfl.gateway = *gateway;
3130
b75cc8f9 3131 return fib6_rule_lookup(net, &rdfl.fl6, skb,
b55b76b2
DJ		 3132 flags, __ip6_route_redirect);
3133}
3134
e2d118a1
LC		 3135void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
3136 kuid_t uid)
3a5ad2ee
DM		 3137{
3138 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
3139 struct dst_entry *dst;
1f7f10ac
MŻ		 3140 struct flowi6 fl6 = {
3141 .flowi6_iif = LOOPBACK_IFINDEX,
3142 .flowi6_oif = oif,
3143 .flowi6_mark = mark,
3144 .daddr = iph->daddr,
3145 .saddr = iph->saddr,
3146 .flowlabel = ip6_flowinfo(iph),
3147 .flowi6_uid = uid,
3148 };
3a5ad2ee 3149
b75cc8f9 3150 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
b55b76b2 3151 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 3152 dst_release(dst);
3153}
3154EXPORT_SYMBOL_GPL(ip6_redirect);
3155
d456336d 3156void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
c92a59ec
DJ		 3157{
3158 const struct ipv6hdr *iph = ipv6_hdr(skb);
3159 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
3160 struct dst_entry *dst;
0b26fb17
MŻ		 3161 struct flowi6 fl6 = {
3162 .flowi6_iif = LOOPBACK_IFINDEX,
3163 .flowi6_oif = oif,
0b26fb17
MŻ		 3164 .daddr = msg->dest,
3165 .saddr = iph->daddr,
3166 .flowi6_uid = sock_net_uid(net, NULL),
3167 };
c92a59ec 3168
b75cc8f9 3169 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
b55b76b2 3170 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 3171 dst_release(dst);
3172}
3173
3a5ad2ee
DM		 3174void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
3175{
e2d118a1
LC		 3176 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
3177 sk->sk_uid);
3a5ad2ee
DM		 3178}
3179EXPORT_SYMBOL_GPL(ip6_sk_redirect);
3180
0dbaee3b 3181static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 3182{
0dbaee3b
DM		 3183 struct net_device *dev = dst->dev;
3184 unsigned int mtu = dst_mtu(dst);
3185 struct net *net = dev_net(dev);
3186
1da177e4
LT		 3187 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
3188
5578689a
DL		 3189 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
3190 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 3191
3192 /*
1ab1457c
YH		 3193 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
3194 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
3195 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 3196 * rely only on pmtu discovery"
3197 */
3198 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
3199 mtu = IPV6_MAXPLEN;
3200 return mtu;
3201}
3202
f67fbeae 3203INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 3204{
427faee1 3205 return ip6_dst_mtu_maybe_forward(dst, false);
d33e4553 3206}
9c97921a 3207EXPORT_INDIRECT_CALLABLE(ip6_mtu);
d33e4553 3208
901731b8
DA		 3209/* MTU selection:
3210 * 1. mtu on route is locked - use it
3211 * 2. mtu from nexthop exception
3212 * 3. mtu from egress device
3213 *
3214 * based on ip6_dst_mtu_forward and exception logic of
3215 * rt6_find_cached_rt; called with rcu_read_lock
3216 */
b748f260
DA		 3217u32 ip6_mtu_from_fib6(const struct fib6_result *res,
3218 const struct in6_addr *daddr,
3219 const struct in6_addr *saddr)
901731b8 3220{
b748f260
DA		 3221 const struct fib6_nh *nh = res->nh;
3222 struct fib6_info *f6i = res->f6i;
901731b8 3223 struct inet6_dev *idev;
510e2ced 3224 struct rt6_info *rt;
901731b8
DA		 3225 u32 mtu = 0;
3226
3227 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
3228 mtu = f6i->fib6_pmtu;
3229 if (mtu)
3230 goto out;
3231 }
3232
510e2ced
WW		 3233 rt = rt6_find_cached_rt(res, daddr, saddr);
3234 if (unlikely(rt)) {
3235 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
3236 } else {
b748f260 3237 struct net_device *dev = nh->fib_nh_dev;
901731b8
DA		 3238
3239 mtu = IPV6_MIN_MTU;
3240 idev = __in6_dev_get(dev);
3241 if (idev && idev->cnf.mtu6 > mtu)
3242 mtu = idev->cnf.mtu6;
3243 }
3244
3245 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3246out:
b748f260 3247 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
901731b8
DA		 3248}
3249
3b00944c 3250struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 3251 struct flowi6 *fl6)
1da177e4 3252{
87a11578 3253 struct dst_entry *dst;
1da177e4
LT		 3254 struct rt6_info *rt;
3255 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 3256 struct net *net = dev_net(dev);
1da177e4 3257
38308473 3258 if (unlikely(!idev))
122bdf67 3259 return ERR_PTR(-ENODEV);
1da177e4 3260
ad706862 3261 rt = ip6_dst_alloc(net, dev, 0);
38308473 3262 if (unlikely(!rt)) {
1da177e4 3263 in6_dev_put(idev);
87a11578 3264 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 3265 goto out;
3266 }
3267
588753f1 3268 rt->dst.input = ip6_input;
8e2ec639 3269 rt->dst.output = ip6_output;
550bab42 3270 rt->rt6i_gateway = fl6->daddr;
87a11578 3271 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 3272 rt->rt6i_dst.plen = 128;
3273 rt->rt6i_idev = idev;
14edd87d 3274 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 3275
4c981e28 3276 /* Add this dst into uncached_list so that rt6_disable_ip() can
587fea74
WW		 3277 * do proper release of the net_device
3278 */
3279 rt6_uncached_list_add(rt);
1da177e4 3280
87a11578
DM		 3281 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
3282
1da177e4 3283out:
87a11578 3284 return dst;
1da177e4
LT		 3285}
3286
af6d1034 3287static void ip6_dst_gc(struct dst_ops *ops)
1da177e4 3288{
86393e52 3289 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e 3290 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
7019b78e
DL		 3291 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
3292 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
3293 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
9cb7c013 3294 unsigned int val;
fc66f95c 3295 int entries;
7019b78e 3296
af6d1034 3297 if (time_after(rt_last_gc + rt_min_interval, jiffies))
1da177e4
LT		 3298 goto out;
3299
9cb7c013 3300 fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true);
fc66f95c
ED		 3301 entries = dst_entries_get_slow(ops);
3302 if (entries < ops->gc_thresh)
9cb7c013 3303 atomic_set(&net->ipv6.ip6_rt_gc_expire, rt_gc_timeout >> 1);
1da177e4 3304out:
9cb7c013
ED		 3305 val = atomic_read(&net->ipv6.ip6_rt_gc_expire);
3306 atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity));
1da177e4
LT		 3307}
3308
b2c709cc
DA		 3309static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
3310 const struct in6_addr *gw_addr, u32 tbid,
3311 int flags, struct fib6_result *res)
8c14586f
DA		 3312{
3313 struct flowi6 fl6 = {
3314 .flowi6_oif = cfg->fc_ifindex,
3315 .daddr = *gw_addr,
3316 .saddr = cfg->fc_prefsrc,
3317 };
3318 struct fib6_table *table;
b2c709cc 3319 int err;
8c14586f 3320
f4797b33 3321 table = fib6_get_table(net, tbid);
8c14586f 3322 if (!table)
b2c709cc 3323 return -EINVAL;
8c14586f
DA		 3324
3325 if (!ipv6_addr_any(&cfg->fc_prefsrc))
3326 flags |= RT6_LOOKUP_F_HAS_SADDR;
3327
f4797b33 3328 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
8c14586f 3329
b2c709cc
DA		 3330 err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags);
3331 if (!err && res->f6i != net->ipv6.fib6_null_entry)
3332 fib6_select_path(net, res, &fl6, cfg->fc_ifindex,
3333 cfg->fc_ifindex != 0, NULL, flags);
8c14586f 3334
b2c709cc 3335 return err;
8c14586f
DA		 3336}
3337
fc1e64e1
DA		 3338static int ip6_route_check_nh_onlink(struct net *net,
3339 struct fib6_config *cfg,
9fbb704c 3340 const struct net_device *dev,
fc1e64e1
DA		 3341 struct netlink_ext_ack *extack)
3342{
b2c709cc 3343 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
fc1e64e1 3344 const struct in6_addr *gw_addr = &cfg->fc_gateway;
b2c709cc 3345 struct fib6_result res = {};
fc1e64e1
DA		 3346 int err;
3347
b2c709cc
DA		 3348 err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res);
3349 if (!err && !(res.fib6_flags & RTF_REJECT) &&
3350 /* ignore match if it is the default route */
3351 !ipv6_addr_any(&res.f6i->fib6_dst.addr) &&
3352 (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) {
3353 NL_SET_ERR_MSG(extack,
3354 "Nexthop has invalid gateway or device mismatch");
3355 err = -EINVAL;
fc1e64e1
DA		 3356 }
3357
3358 return err;
3359}
3360
1edce99f
DA		 3361static int ip6_route_check_nh(struct net *net,
3362 struct fib6_config *cfg,
3363 struct net_device **_dev,
3364 struct inet6_dev **idev)
3365{
3366 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3367 struct net_device *dev = _dev ? *_dev : NULL;
b2c709cc
DA		 3368 int flags = RT6_LOOKUP_F_IFACE;
3369 struct fib6_result res = {};
1edce99f
DA		 3370 int err = -EHOSTUNREACH;
3371
3372 if (cfg->fc_table) {
b2c709cc
DA		 3373 err = ip6_nh_lookup_table(net, cfg, gw_addr,
3374 cfg->fc_table, flags, &res);
3375 /* gw_addr can not require a gateway or resolve to a reject
3376 * route. If a device is given, it must match the result.
3377 */
3378 if (err || res.fib6_flags & RTF_REJECT ||
3379 res.nh->fib_nh_gw_family ||
3380 (dev && dev != res.nh->fib_nh_dev))
3381 err = -EHOSTUNREACH;
1edce99f
DA		 3382 }
3383
b2c709cc
DA		 3384 if (err < 0) {
3385 struct flowi6 fl6 = {
3386 .flowi6_oif = cfg->fc_ifindex,
3387 .daddr = *gw_addr,
3388 };
1edce99f 3389
b2c709cc
DA		 3390 err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags);
3391 if (err || res.fib6_flags & RTF_REJECT ||
3392 res.nh->fib_nh_gw_family)
3393 err = -EHOSTUNREACH;
3394
3395 if (err)
3396 return err;
3397
3398 fib6_select_path(net, &res, &fl6, cfg->fc_ifindex,
3399 cfg->fc_ifindex != 0, NULL, flags);
3400 }
1edce99f 3401
b2c709cc 3402 err = 0;
1edce99f 3403 if (dev) {
b2c709cc
DA		 3404 if (dev != res.nh->fib_nh_dev)
3405 err = -EHOSTUNREACH;
1edce99f 3406 } else {
b2c709cc 3407 *_dev = dev = res.nh->fib_nh_dev;
1edce99f 3408 dev_hold(dev);
b2c709cc 3409 *idev = in6_dev_get(dev);
1edce99f
DA		 3410 }
3411
1edce99f
DA		 3412 return err;
3413}
3414
9fbb704c
DA		 3415static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
3416 struct net_device **_dev, struct inet6_dev **idev,
3417 struct netlink_ext_ack *extack)
3418{
3419 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3420 int gwa_type = ipv6_addr_type(gw_addr);
232378e8 3421 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
9fbb704c 3422 const struct net_device *dev = *_dev;
232378e8 3423 bool need_addr_check = !dev;
9fbb704c
DA		 3424 int err = -EINVAL;
3425
3426 /* if gw_addr is local we will fail to detect this in case
3427 * address is still TENTATIVE (DAD in progress). rt6_lookup()
3428 * will return already-added prefix route via interface that
3429 * prefix route was assigned to, which might be non-loopback.
3430 */
232378e8
DA		 3431 if (dev &&
3432 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3433 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
9fbb704c
DA		 3434 goto out;
3435 }
3436
3437 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
3438 /* IPv6 strictly inhibits using not link-local
3439 * addresses as nexthop address.
3440 * Otherwise, router will not able to send redirects.
3441 * It is very good, but in some (rare!) circumstances
3442 * (SIT, PtP, NBMA NOARP links) it is handy to allow
3443 * some exceptions. --ANK
3444 * We allow IPv4-mapped nexthops to support RFC4798-type
3445 * addressing
3446 */
3447 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
3448 NL_SET_ERR_MSG(extack, "Invalid gateway address");
3449 goto out;
3450 }
3451
b2c709cc
DA		 3452 rcu_read_lock();
3453
9fbb704c
DA		 3454 if (cfg->fc_flags & RTNH_F_ONLINK)
3455 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
3456 else
3457 err = ip6_route_check_nh(net, cfg, _dev, idev);
3458
b2c709cc
DA		 3459 rcu_read_unlock();
3460
9fbb704c
DA		 3461 if (err)
3462 goto out;
3463 }
3464
3465 /* reload in case device was changed */
3466 dev = *_dev;
3467
3468 err = -EINVAL;
3469 if (!dev) {
3470 NL_SET_ERR_MSG(extack, "Egress device not specified");
3471 goto out;
3472 } else if (dev->flags & IFF_LOOPBACK) {
3473 NL_SET_ERR_MSG(extack,
3474 "Egress device can not be loopback device for this route");
3475 goto out;
3476 }
232378e8
DA		 3477
3478 /* if we did not check gw_addr above, do so now that the
3479 * egress device has been resolved.
3480 */
3481 if (need_addr_check &&
3482 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3483 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3484 goto out;
3485 }
3486
9fbb704c
DA		 3487 err = 0;
3488out:
3489 return err;
3490}
3491
83c44251
DA		 3492static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
3493{
3494 if ((flags & RTF_REJECT) ||
3495 (dev && (dev->flags & IFF_LOOPBACK) &&
3496 !(addr_type & IPV6_ADDR_LOOPBACK) &&
aea23c32 3497 !(flags & (RTF_ANYCAST | RTF_LOCAL))))
83c44251
DA		 3498 return true;
3499
3500 return false;
3501}
3502
3503int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
3504 struct fib6_config *cfg, gfp_t gfp_flags,
3505 struct netlink_ext_ack *extack)
3506{
3507 struct net_device *dev = NULL;
3508 struct inet6_dev *idev = NULL;
3509 int addr_type;
3510 int err;
3511
f1741730 3512 fib6_nh->fib_nh_family = AF_INET6;
1bef4c22
ED		 3513#ifdef CONFIG_IPV6_ROUTER_PREF
3514 fib6_nh->last_probe = jiffies;
3515#endif
38428d68
RP		 3516 if (cfg->fc_is_fdb) {
3517 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3518 fib6_nh->fib_nh_gw_family = AF_INET6;
3519 return 0;
3520 }
f1741730 3521
83c44251
DA		 3522 err = -ENODEV;
3523 if (cfg->fc_ifindex) {
3524 dev = dev_get_by_index(net, cfg->fc_ifindex);
3525 if (!dev)
3526 goto out;
3527 idev = in6_dev_get(dev);
3528 if (!idev)
3529 goto out;
3530 }
3531
3532 if (cfg->fc_flags & RTNH_F_ONLINK) {
3533 if (!dev) {
3534 NL_SET_ERR_MSG(extack,
3535 "Nexthop device required for onlink");
3536 goto out;
3537 }
3538
3539 if (!(dev->flags & IFF_UP)) {
3540 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3541 err = -ENETDOWN;
3542 goto out;
3543 }
3544
ad1601ae 3545 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
83c44251
DA		 3546 }
3547
ad1601ae 3548 fib6_nh->fib_nh_weight = 1;
83c44251
DA		 3549
3550 /* We cannot add true routes via loopback here,
3551 * they would result in kernel looping; promote them to reject routes
3552 */
3553 addr_type = ipv6_addr_type(&cfg->fc_dst);
3554 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3555 /* hold loopback dev/idev if we haven't done so. */
3556 if (dev != net->loopback_dev) {
3557 if (dev) {
3558 dev_put(dev);
3559 in6_dev_put(idev);
3560 }
3561 dev = net->loopback_dev;
3562 dev_hold(dev);
3563 idev = in6_dev_get(dev);
3564 if (!idev) {
3565 err = -ENODEV;
3566 goto out;
3567 }
3568 }
7dd73168 3569 goto pcpu_alloc;
83c44251
DA		 3570 }
3571
3572 if (cfg->fc_flags & RTF_GATEWAY) {
3573 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3574 if (err)
3575 goto out;
3576
ad1601ae 3577 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
bdf00467 3578 fib6_nh->fib_nh_gw_family = AF_INET6;
83c44251
DA		 3579 }
3580
3581 err = -ENODEV;
3582 if (!dev)
3583 goto out;
3584
3585 if (idev->cnf.disable_ipv6) {
3586 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3587 err = -EACCES;
3588 goto out;
3589 }
3590
3591 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3592 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3593 err = -ENETDOWN;
3594 goto out;
3595 }
3596
3597 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3598 !netif_carrier_ok(dev))
ad1601ae 3599 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
83c44251 3600
faee6769 3601 err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap,
7dd73168
DA		 3602 cfg->fc_encap_type, cfg, gfp_flags, extack);
3603 if (err)
3604 goto out;
3605
3606pcpu_alloc:
f40b6ae2
DA		 3607 fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
3608 if (!fib6_nh->rt6i_pcpu) {
3609 err = -ENOMEM;
3610 goto out;
3611 }
3612
ad1601ae 3613 fib6_nh->fib_nh_dev = dev;
e44b14eb
ED		 3614 netdev_tracker_alloc(dev, &fib6_nh->fib_nh_dev_tracker, gfp_flags);
3615
f1741730 3616 fib6_nh->fib_nh_oif = dev->ifindex;
83c44251
DA		 3617 err = 0;
3618out:
3619 if (idev)
3620 in6_dev_put(idev);
3621
3622 if (err) {
ad1601ae
DA		 3623 lwtstate_put(fib6_nh->fib_nh_lws);
3624 fib6_nh->fib_nh_lws = NULL;
1160dfa1 3625 dev_put(dev);
83c44251
DA		 3626 }
3627
3628 return err;
3629}
3630
dac7d0f2
DA		 3631void fib6_nh_release(struct fib6_nh *fib6_nh)
3632{
cc5c073a
DA		 3633 struct rt6_exception_bucket *bucket;
3634
3635 rcu_read_lock();
3636
3637 fib6_nh_flush_exceptions(fib6_nh, NULL);
3638 bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL);
3639 if (bucket) {
3640 rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL);
3641 kfree(bucket);
3642 }
3643
3644 rcu_read_unlock();
3645
61308050
NA		 3646 fib6_nh_release_dsts(fib6_nh);
3647 free_percpu(fib6_nh->rt6i_pcpu);
f40b6ae2 3648
979e276e 3649 fib_nh_common_release(&fib6_nh->nh_common);
dac7d0f2
DA		 3650}
3651
8837cbbf
NA		 3652void fib6_nh_release_dsts(struct fib6_nh *fib6_nh)
3653{
3654 int cpu;
3655
3656 if (!fib6_nh->rt6i_pcpu)
3657 return;
3658
3659 for_each_possible_cpu(cpu) {
3660 struct rt6_info *pcpu_rt, **ppcpu_rt;
3661
3662 ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
3663 pcpu_rt = xchg(ppcpu_rt, NULL);
3664 if (pcpu_rt) {
3665 dst_dev_put(&pcpu_rt->dst);
3666 dst_release(&pcpu_rt->dst);
3667 }
3668 }
3669}
3670
8d1c802b 3671static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
acb54e3c 3672 gfp_t gfp_flags,
333c4301 3673 struct netlink_ext_ack *extack)
1da177e4 3674{
5578689a 3675 struct net *net = cfg->fc_nlinfo.nl_net;
8d1c802b 3676 struct fib6_info *rt = NULL;
f88d8ea6 3677 struct nexthop *nh = NULL;
c71099ac 3678 struct fib6_table *table;
f88d8ea6 3679 struct fib6_nh *fib6_nh;
8c5b83f0 3680 int err = -EINVAL;
83c44251 3681 int addr_type;
1da177e4 3682
557c44be 3683 /* RTF_PCPU is an internal flag; can not be set by userspace */
d5d531cb
DA		 3684 if (cfg->fc_flags & RTF_PCPU) {
3685 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
557c44be 3686 goto out;
d5d531cb 3687 }
557c44be 3688
2ea2352e
WW		 3689 /* RTF_CACHE is an internal flag; can not be set by userspace */
3690 if (cfg->fc_flags & RTF_CACHE) {
3691 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3692 goto out;
3693 }
3694
e8478e80
DA		 3695 if (cfg->fc_type > RTN_MAX) {
3696 NL_SET_ERR_MSG(extack, "Invalid route type");
3697 goto out;
3698 }
3699
d5d531cb
DA		 3700 if (cfg->fc_dst_len > 128) {
3701 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3702 goto out;
3703 }
3704 if (cfg->fc_src_len > 128) {
3705 NL_SET_ERR_MSG(extack, "Invalid source address length");
8c5b83f0 3706 goto out;
d5d531cb 3707 }
1da177e4 3708#ifndef CONFIG_IPV6_SUBTREES
d5d531cb
DA		 3709 if (cfg->fc_src_len) {
3710 NL_SET_ERR_MSG(extack,
3711 "Specifying source address requires IPV6_SUBTREES to be enabled");
8c5b83f0 3712 goto out;
d5d531cb 3713 }
1da177e4 3714#endif
5b98324e
DA		 3715 if (cfg->fc_nh_id) {
3716 nh = nexthop_find_by_id(net, cfg->fc_nh_id);
3717 if (!nh) {
3718 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
3719 goto out;
3720 }
3721 err = fib6_check_nexthop(nh, cfg, extack);
3722 if (err)
3723 goto out;
3724 }
fc1e64e1 3725
d71314b4 3726 err = -ENOBUFS;
38308473
DM		 3727 if (cfg->fc_nlinfo.nlh &&
3728 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 3729 table = fib6_get_table(net, cfg->fc_table);
38308473 3730 if (!table) {
f3213831 3731 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 3732 table = fib6_new_table(net, cfg->fc_table);
3733 }
3734 } else {
3735 table = fib6_new_table(net, cfg->fc_table);
3736 }
38308473
DM		 3737
3738 if (!table)
c71099ac 3739 goto out;
c71099ac 3740
93531c67 3741 err = -ENOMEM;
f88d8ea6 3742 rt = fib6_info_alloc(gfp_flags, !nh);
93531c67 3743 if (!rt)
1da177e4 3744 goto out;
93531c67 3745
d7e774f3
DA		 3746 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3747 extack);
767a2217
DA		 3748 if (IS_ERR(rt->fib6_metrics)) {
3749 err = PTR_ERR(rt->fib6_metrics);
fda21d46
ED		 3750 /* Do not leave garbage there. */
3751 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
8fb4792f 3752 goto out_free;
767a2217
DA		 3753 }
3754
93531c67
DA		 3755 if (cfg->fc_flags & RTF_ADDRCONF)
3756 rt->dst_nocount = true;
1da177e4 3757
1716a961 3758 if (cfg->fc_flags & RTF_EXPIRES)
14895687 3759 fib6_set_expires(rt, jiffies +
1716a961
G		 3760 clock_t_to_jiffies(cfg->fc_expires));
3761 else
14895687 3762 fib6_clean_expires(rt);
1da177e4 3763
86872cb5
TG		 3764 if (cfg->fc_protocol == RTPROT_UNSPEC)
3765 cfg->fc_protocol = RTPROT_BOOT;
93c2fb25 3766 rt->fib6_protocol = cfg->fc_protocol;
86872cb5 3767
83c44251
DA		 3768 rt->fib6_table = table;
3769 rt->fib6_metric = cfg->fc_metric;
c7036d97 3770 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
2b2450ca 3771 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
19e42e45 3772
93c2fb25
DA		 3773 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3774 rt->fib6_dst.plen = cfg->fc_dst_len;
e5fd387a 3775
1da177e4 3776#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 3777 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3778 rt->fib6_src.plen = cfg->fc_src_len;
1da177e4 3779#endif
f88d8ea6 3780 if (nh) {
f88d8ea6 3781 if (rt->fib6_src.plen) {
4daa95af 3782 NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing");
821bbf79 3783 goto out_free;
f88d8ea6 3784 }
706ec919
XY		 3785 if (!nexthop_get(nh)) {
3786 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
821bbf79 3787 goto out_free;
706ec919 3788 }
f88d8ea6
DA		 3789 rt->nh = nh;
3790 fib6_nh = nexthop_fib6_nh(rt->nh);
3791 } else {
3792 err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack);
3793 if (err)
3794 goto out;
1da177e4 3795
f88d8ea6
DA		 3796 fib6_nh = rt->fib6_nh;
3797
3798 /* We cannot add true routes via loopback here, they would
3799 * result in kernel looping; promote them to reject routes
3800 */
3801 addr_type = ipv6_addr_type(&cfg->fc_dst);
3802 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev,
3803 addr_type))
3804 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3805 }
955ec4cb 3806
c3968a85 3807 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
f88d8ea6 3808 struct net_device *dev = fib6_nh->fib_nh_dev;
83c44251 3809
c3968a85 3810 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
d5d531cb 3811 NL_SET_ERR_MSG(extack, "Invalid source address");
c3968a85
DW		 3812 err = -EINVAL;
3813 goto out;
3814 }
93c2fb25
DA		 3815 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3816 rt->fib6_prefsrc.plen = 128;
c3968a85 3817 } else
93c2fb25 3818 rt->fib6_prefsrc.plen = 0;
c3968a85 3819
8c5b83f0 3820 return rt;
6b9ea5a6 3821out:
93531c67 3822 fib6_info_release(rt);
8c5b83f0 3823 return ERR_PTR(err);
821bbf79
CL		 3824out_free:
3825 ip_fib_metrics_put(rt->fib6_metrics);
3826 kfree(rt);
3827 return ERR_PTR(err);
6b9ea5a6
RP		 3828}
3829
acb54e3c 3830int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
333c4301 3831 struct netlink_ext_ack *extack)
6b9ea5a6 3832{
8d1c802b 3833 struct fib6_info *rt;
6b9ea5a6
RP		 3834 int err;
3835
acb54e3c 3836 rt = ip6_route_info_create(cfg, gfp_flags, extack);
d4ead6b3
DA		 3837 if (IS_ERR(rt))
3838 return PTR_ERR(rt);
6b9ea5a6 3839
d4ead6b3 3840 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
93531c67 3841 fib6_info_release(rt);
6b9ea5a6 3842
1da177e4
LT		 3843 return err;
3844}
3845
8d1c802b 3846static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
1da177e4 3847{
afb1d4b5 3848 struct net *net = info->nl_net;
c71099ac 3849 struct fib6_table *table;
afb1d4b5 3850 int err;
1da177e4 3851
421842ed 3852 if (rt == net->ipv6.fib6_null_entry) {
6825a26c
G		 3853 err = -ENOENT;
3854 goto out;
3855 }
6c813a72 3856
93c2fb25 3857 table = rt->fib6_table;
66f5d6ce 3858 spin_lock_bh(&table->tb6_lock);
86872cb5 3859 err = fib6_del(rt, info);
66f5d6ce 3860 spin_unlock_bh(&table->tb6_lock);
1da177e4 3861
6825a26c 3862out:
93531c67 3863 fib6_info_release(rt);
1da177e4
LT		 3864 return err;
3865}
3866
11dd74b3 3867int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
e0a1ad73 3868{
11dd74b3
RP		 3869 struct nl_info info = {
3870 .nl_net = net,
3871 .skip_notify = skip_notify
3872 };
afb1d4b5 3873
528c4ceb 3874 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 3875}
3876
8d1c802b 3877static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
0ae81335
DA		 3878{
3879 struct nl_info *info = &cfg->fc_nlinfo;
e3330039 3880 struct net *net = info->nl_net;
16a16cd3 3881 struct sk_buff *skb = NULL;
0ae81335 3882 struct fib6_table *table;
e3330039 3883 int err = -ENOENT;
0ae81335 3884
421842ed 3885 if (rt == net->ipv6.fib6_null_entry)
e3330039 3886 goto out_put;
93c2fb25 3887 table = rt->fib6_table;
66f5d6ce 3888 spin_lock_bh(&table->tb6_lock);
0ae81335 3889
93c2fb25 3890 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
8d1c802b 3891 struct fib6_info *sibling, *next_sibling;
0284696b 3892 struct fib6_node *fn;
0ae81335 3893
16a16cd3
DA		 3894 /* prefer to send a single notification with all hops */
3895 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3896 if (skb) {
3897 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3898
d4ead6b3 3899 if (rt6_fill_node(net, skb, rt, NULL,
16a16cd3
DA		 3900 NULL, NULL, 0, RTM_DELROUTE,
3901 info->portid, seq, 0) < 0) {
3902 kfree_skb(skb);
3903 skb = NULL;
3904 } else
3905 info->skip_notify = 1;
3906 }
3907
0284696b
IS		 3908 /* 'rt' points to the first sibling route. If it is not the
3909 * leaf, then we do not need to send a notification. Otherwise,
3910 * we need to check if the last sibling has a next route or not
3911 * and emit a replace or delete notification, respectively.
3912 */
2881fd61 3913 info->skip_notify_kernel = 1;
0284696b
IS		 3914 fn = rcu_dereference_protected(rt->fib6_node,
3915 lockdep_is_held(&table->tb6_lock));
3916 if (rcu_access_pointer(fn->leaf) == rt) {
3917 struct fib6_info *last_sibling, *replace_rt;
3918
3919 last_sibling = list_last_entry(&rt->fib6_siblings,
3920 struct fib6_info,
3921 fib6_siblings);
3922 replace_rt = rcu_dereference_protected(
3923 last_sibling->fib6_next,
3924 lockdep_is_held(&table->tb6_lock));
3925 if (replace_rt)
3926 call_fib6_entry_notifiers_replace(net,
3927 replace_rt);
3928 else
3929 call_fib6_multipath_entry_notifiers(net,
caafb250 3930 FIB_EVENT_ENTRY_DEL,
0284696b
IS		 3931 rt, rt->fib6_nsiblings,
3932 NULL);
3933 }
0ae81335 3934 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25
DA		 3935 &rt->fib6_siblings,
3936 fib6_siblings) {
0ae81335
DA		 3937 err = fib6_del(sibling, info);
3938 if (err)
e3330039 3939 goto out_unlock;
0ae81335
DA		 3940 }
3941 }
3942
3943 err = fib6_del(rt, info);
e3330039 3944out_unlock:
66f5d6ce 3945 spin_unlock_bh(&table->tb6_lock);
e3330039 3946out_put:
93531c67 3947 fib6_info_release(rt);
16a16cd3
DA		 3948
3949 if (skb) {
e3330039 3950 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
16a16cd3
DA		 3951 info->nlh, gfp_any());
3952 }
0ae81335
DA		 3953 return err;
3954}
3955
0fa6efc5 3956static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
23fb93a4
DA		 3957{
3958 int rc = -ESRCH;
3959
3960 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3961 goto out;
3962
3963 if (cfg->fc_flags & RTF_GATEWAY &&
3964 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3965 goto out;
761f6026
XL		 3966
3967 rc = rt6_remove_exception_rt(rt);
23fb93a4
DA		 3968out:
3969 return rc;
3970}
3971
0fa6efc5
DA		 3972static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
3973 struct fib6_nh *nh)
3974{
3975 struct fib6_result res = {
3976 .f6i = rt,
3977 .nh = nh,
3978 };
3979 struct rt6_info *rt_cache;
3980
3981 rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
3982 if (rt_cache)
3983 return __ip6_del_cached_rt(rt_cache, cfg);
3984
3985 return 0;
3986}
3987
5b98324e
DA		 3988struct fib6_nh_del_cached_rt_arg {
3989 struct fib6_config *cfg;
3990 struct fib6_info *f6i;
3991};
3992
3993static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg)
3994{
3995 struct fib6_nh_del_cached_rt_arg *arg = _arg;
3996 int rc;
3997
3998 rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh);
3999 return rc != -ESRCH ? rc : 0;
4000}
4001
4002static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i)
4003{
4004 struct fib6_nh_del_cached_rt_arg arg = {
4005 .cfg = cfg,
4006 .f6i = f6i
4007 };
4008
4009 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg);
4010}
4011
333c4301
DA		 4012static int ip6_route_del(struct fib6_config *cfg,
4013 struct netlink_ext_ack *extack)
1da177e4 4014{
c71099ac 4015 struct fib6_table *table;
8d1c802b 4016 struct fib6_info *rt;
1da177e4 4017 struct fib6_node *fn;
1da177e4
LT		 4018 int err = -ESRCH;
4019
5578689a 4020 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
d5d531cb
DA		 4021 if (!table) {
4022 NL_SET_ERR_MSG(extack, "FIB table does not exist");
c71099ac 4023 return err;
d5d531cb 4024 }
c71099ac 4025
66f5d6ce 4026 rcu_read_lock();
1da177e4 4027
c71099ac 4028 fn = fib6_locate(&table->tb6_root,
86872cb5 4029 &cfg->fc_dst, cfg->fc_dst_len,
38fbeeee 4030 &cfg->fc_src, cfg->fc_src_len,
2b760fcf 4031 !(cfg->fc_flags & RTF_CACHE));
1ab1457c 4032
1da177e4 4033 if (fn) {
66f5d6ce 4034 for_each_fib6_node_rt_rcu(fn) {
ad1601ae
DA		 4035 struct fib6_nh *nh;
4036
3401bfb1
SB		 4037 if (rt->nh && cfg->fc_nh_id &&
4038 rt->nh->id != cfg->fc_nh_id)
5b98324e 4039 continue;
23fb93a4 4040
5b98324e
DA		 4041 if (cfg->fc_flags & RTF_CACHE) {
4042 int rc = 0;
4043
4044 if (rt->nh) {
4045 rc = ip6_del_cached_rt_nh(cfg, rt);
4046 } else if (cfg->fc_nh_id) {
4047 continue;
4048 } else {
4049 nh = rt->fib6_nh;
4050 rc = ip6_del_cached_rt(cfg, rt, nh);
4051 }
0fa6efc5
DA		 4052 if (rc != -ESRCH) {
4053 rcu_read_unlock();
4054 return rc;
23fb93a4
DA		 4055 }
4056 continue;
2b760fcf 4057 }
ad1601ae 4058
5b98324e
DA		 4059 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
4060 continue;
4061 if (cfg->fc_protocol &&
4062 cfg->fc_protocol != rt->fib6_protocol)
4063 continue;
4064
4065 if (rt->nh) {
4066 if (!fib6_info_hold_safe(rt))
4067 continue;
4068 rcu_read_unlock();
4069
4070 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
4071 }
4072 if (cfg->fc_nh_id)
4073 continue;
4074
4075 nh = rt->fib6_nh;
86872cb5 4076 if (cfg->fc_ifindex &&
ad1601ae
DA		 4077 (!nh->fib_nh_dev ||
4078 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
1da177e4 4079 continue;
86872cb5 4080 if (cfg->fc_flags & RTF_GATEWAY &&
ad1601ae 4081 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
1da177e4 4082 continue;
e873e4b9
WW		 4083 if (!fib6_info_hold_safe(rt))
4084 continue;
66f5d6ce 4085 rcu_read_unlock();
1da177e4 4086
0ae81335
DA		 4087 /* if gateway was specified only delete the one hop */
4088 if (cfg->fc_flags & RTF_GATEWAY)
4089 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
4090
4091 return __ip6_del_rt_siblings(rt, cfg);
1da177e4
LT		 4092 }
4093 }
66f5d6ce 4094 rcu_read_unlock();
1da177e4
LT		 4095
4096 return err;
4097}
4098
6700c270 4099static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 4100{
a6279458 4101 struct netevent_redirect netevent;
e8599ff4 4102 struct rt6_info *rt, *nrt = NULL;
85bd05de 4103 struct fib6_result res = {};
e8599ff4
DM		 4104 struct ndisc_options ndopts;
4105 struct inet6_dev *in6_dev;
4106 struct neighbour *neigh;
71bcdba0 4107 struct rd_msg *msg;
6e157b6a
DM		 4108 int optlen, on_link;
4109 u8 *lladdr;
e8599ff4 4110
29a3cad5 4111 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 4112 optlen -= sizeof(*msg);
e8599ff4
DM		 4113
4114 if (optlen < 0) {
6e157b6a 4115 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 4116 return;
4117 }
4118
71bcdba0 4119 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 4120
71bcdba0 4121 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 4122 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 4123 return;
4124 }
4125
6e157b6a 4126 on_link = 0;
71bcdba0 4127 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 4128 on_link = 1;
71bcdba0 4129 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 4130 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 4131 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 4132 return;
4133 }
4134
4135 in6_dev = __in6_dev_get(skb->dev);
4136 if (!in6_dev)
4137 return;
4138 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
4139 return;
4140
4141 /* RFC2461 8.1:
4142 * The IP source address of the Redirect MUST be the same as the current
4143 * first-hop router for the specified ICMP Destination Address.
4144 */
4145
f997c55c 4146 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 4147 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
4148 return;
4149 }
6e157b6a
DM		 4150
4151 lladdr = NULL;
e8599ff4
DM		 4152 if (ndopts.nd_opts_tgt_lladdr) {
4153 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
4154 skb->dev);
4155 if (!lladdr) {
4156 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
4157 return;
4158 }
4159 }
4160
6e157b6a 4161 rt = (struct rt6_info *) dst;
ec13ad1d 4162 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 4163 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 4164 return;
6e157b6a 4165 }
e8599ff4 4166
6e157b6a
DM		 4167 /* Redirect received -> path was valid.
4168 * Look, redirects are sent only in response to data packets,
4169 * so that this nexthop apparently is reachable. --ANK
4170 */
0dec879f 4171 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
a6279458 4172
71bcdba0 4173 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 4174 if (!neigh)
4175 return;
a6279458 4176
1da177e4
LT		 4177 /*
4178 * We have finally decided to accept it.
4179 */
4180
f997c55c 4181 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 4182 NEIGH_UPDATE_F_WEAK_OVERRIDE|
4183 NEIGH_UPDATE_F_OVERRIDE|
4184 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 4185 NEIGH_UPDATE_F_ISROUTER)),
4186 NDISC_REDIRECT, &ndopts);
1da177e4 4187
4d85cd0c 4188 rcu_read_lock();
85bd05de 4189 res.f6i = rcu_dereference(rt->from);
ff24e498 4190 if (!res.f6i)
886b7a50 4191 goto out;
8a14e46f 4192
49d5b8ef
DA		 4193 if (res.f6i->nh) {
4194 struct fib6_nh_match_arg arg = {
4195 .dev = dst->dev,
4196 .gw = &rt->rt6i_gateway,
4197 };
4198
4199 nexthop_for_each_fib6_nh(res.f6i->nh,
4200 fib6_nh_find_match, &arg);
4201
4202 /* fib6_info uses a nexthop that does not have fib6_nh
4203 * using the dst->dev. Should be impossible
4204 */
4205 if (!arg.match)
4206 goto out;
4207 res.nh = arg.match;
4208 } else {
4209 res.nh = res.f6i->fib6_nh;
4210 }
4211
7d21fec9
DA		 4212 res.fib6_flags = res.f6i->fib6_flags;
4213 res.fib6_type = res.f6i->fib6_type;
85bd05de 4214 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
38308473 4215 if (!nrt)
1da177e4
LT		 4216 goto out;
4217
4218 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
4219 if (on_link)
4220 nrt->rt6i_flags &= ~RTF_GATEWAY;
4221
4e3fd7a0 4222 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 4223
886b7a50 4224 /* rt6_insert_exception() will take care of duplicated exceptions */
5012f0a5 4225 if (rt6_insert_exception(nrt, &res)) {
2b760fcf
WW		 4226 dst_release_immediate(&nrt->dst);
4227 goto out;
4228 }
1da177e4 4229
d8d1f30b
CG		 4230 netevent.old = &rt->dst;
4231 netevent.new = &nrt->dst;
71bcdba0 4232 netevent.daddr = &msg->dest;
60592833 4233 netevent.neigh = neigh;
8d71740c
TT		 4234 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
4235
1da177e4 4236out:
886b7a50 4237 rcu_read_unlock();
e8599ff4 4238 neigh_release(neigh);
6e157b6a
DM		 4239}
4240
70ceb4f5 4241#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 4242static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 4243 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 4244 const struct in6_addr *gwaddr,
4245 struct net_device *dev)
70ceb4f5 4246{
830218c1
DA		 4247 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4248 int ifindex = dev->ifindex;
70ceb4f5 4249 struct fib6_node *fn;
8d1c802b 4250 struct fib6_info *rt = NULL;
c71099ac
TG		 4251 struct fib6_table *table;
4252
830218c1 4253 table = fib6_get_table(net, tb_id);
38308473 4254 if (!table)
c71099ac 4255 return NULL;
70ceb4f5 4256
66f5d6ce 4257 rcu_read_lock();
38fbeeee 4258 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
70ceb4f5
YH		 4259 if (!fn)
4260 goto out;
4261
66f5d6ce 4262 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 4263 /* these routes do not use nexthops */
4264 if (rt->nh)
4265 continue;
1cf844c7 4266 if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex)
70ceb4f5 4267 continue;
2b2450ca 4268 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
1cf844c7 4269 !rt->fib6_nh->fib_nh_gw_family)
70ceb4f5 4270 continue;
1cf844c7 4271 if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr))
70ceb4f5 4272 continue;
e873e4b9
WW		 4273 if (!fib6_info_hold_safe(rt))
4274 continue;
70ceb4f5
YH		 4275 break;
4276 }
4277out:
66f5d6ce 4278 rcu_read_unlock();
70ceb4f5
YH		 4279 return rt;
4280}
4281
8d1c802b 4282static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 4283 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 4284 const struct in6_addr *gwaddr,
4285 struct net_device *dev,
95c96174 4286 unsigned int pref)
70ceb4f5 4287{
86872cb5 4288 struct fib6_config cfg = {
238fc7ea 4289 .fc_metric = IP6_RT_PRIO_USER,
830218c1 4290 .fc_ifindex = dev->ifindex,
86872cb5
TG		 4291 .fc_dst_len = prefixlen,
4292 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
4293 RTF_UP | RTF_PREF(pref),
b91d5329 4294 .fc_protocol = RTPROT_RA,
e8478e80 4295 .fc_type = RTN_UNICAST,
15e47304 4296 .fc_nlinfo.portid = 0,
efa2cea0
DL		 4297 .fc_nlinfo.nlh = NULL,
4298 .fc_nlinfo.nl_net = net,
86872cb5
TG		 4299 };
4300
91b2c9a0 4301 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 4302 cfg.fc_dst = *prefix;
4303 cfg.fc_gateway = *gwaddr;
70ceb4f5 4304
e317da96
YH		 4305 /* We should treat it as a default route if prefix length is 0. */
4306 if (!prefixlen)
86872cb5 4307 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 4308
acb54e3c 4309 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
70ceb4f5 4310
830218c1 4311 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
70ceb4f5
YH		 4312}
4313#endif
4314
8d1c802b 4315struct fib6_info *rt6_get_dflt_router(struct net *net,
afb1d4b5
DA		 4316 const struct in6_addr *addr,
4317 struct net_device *dev)
1ab1457c 4318{
830218c1 4319 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
8d1c802b 4320 struct fib6_info *rt;
c71099ac 4321 struct fib6_table *table;
1da177e4 4322
afb1d4b5 4323 table = fib6_get_table(net, tb_id);
38308473 4324 if (!table)
c71099ac 4325 return NULL;
1da177e4 4326
66f5d6ce
WW		 4327 rcu_read_lock();
4328 for_each_fib6_node_rt_rcu(&table->tb6_root) {
f88d8ea6 4329 struct fib6_nh *nh;
ad1601ae 4330
f88d8ea6
DA		 4331 /* RA routes do not use nexthops */
4332 if (rt->nh)
4333 continue;
4334
4335 nh = rt->fib6_nh;
ad1601ae 4336 if (dev == nh->fib_nh_dev &&
93c2fb25 4337 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
ad1601ae 4338 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
1da177e4
LT		 4339 break;
4340 }
e873e4b9
WW		 4341 if (rt && !fib6_info_hold_safe(rt))
4342 rt = NULL;
66f5d6ce 4343 rcu_read_unlock();
1da177e4
LT		 4344 return rt;
4345}
4346
8d1c802b 4347struct fib6_info *rt6_add_dflt_router(struct net *net,
afb1d4b5 4348 const struct in6_addr *gwaddr,
ebacaaa0 4349 struct net_device *dev,
6b2e04bc
PC		 4350 unsigned int pref,
4351 u32 defrtr_usr_metric)
1da177e4 4352{
86872cb5 4353 struct fib6_config cfg = {
ca254490 4354 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
6b2e04bc 4355 .fc_metric = defrtr_usr_metric,
86872cb5
TG		 4356 .fc_ifindex = dev->ifindex,
4357 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
4358 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
b91d5329 4359 .fc_protocol = RTPROT_RA,
e8478e80 4360 .fc_type = RTN_UNICAST,
15e47304 4361 .fc_nlinfo.portid = 0,
5578689a 4362 .fc_nlinfo.nlh = NULL,
afb1d4b5 4363 .fc_nlinfo.nl_net = net,
86872cb5 4364 };
1da177e4 4365
4e3fd7a0 4366 cfg.fc_gateway = *gwaddr;
1da177e4 4367
acb54e3c 4368 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
830218c1
DA		 4369 struct fib6_table *table;
4370
4371 table = fib6_get_table(dev_net(dev), cfg.fc_table);
4372 if (table)
4373 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
4374 }
1da177e4 4375
afb1d4b5 4376 return rt6_get_dflt_router(net, gwaddr, dev);
1da177e4
LT		 4377}
4378
afb1d4b5
DA		 4379static void __rt6_purge_dflt_routers(struct net *net,
4380 struct fib6_table *table)
1da177e4 4381{
8d1c802b 4382 struct fib6_info *rt;
1da177e4
LT		 4383
4384restart:
66f5d6ce
WW		 4385 rcu_read_lock();
4386 for_each_fib6_node_rt_rcu(&table->tb6_root) {
dcd1f572
DA		 4387 struct net_device *dev = fib6_info_nh_dev(rt);
4388 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
4389
93c2fb25 4390 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
e873e4b9
WW		 4391 (!idev || idev->cnf.accept_ra != 2) &&
4392 fib6_info_hold_safe(rt)) {
93531c67 4393 rcu_read_unlock();
11dd74b3 4394 ip6_del_rt(net, rt, false);
1da177e4
LT		 4395 goto restart;
4396 }
4397 }
66f5d6ce 4398 rcu_read_unlock();
830218c1
DA		 4399
4400 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
4401}
4402
4403void rt6_purge_dflt_routers(struct net *net)
4404{
4405 struct fib6_table *table;
4406 struct hlist_head *head;
4407 unsigned int h;
4408
4409 rcu_read_lock();
4410
4411 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
4412 head = &net->ipv6.fib_table_hash[h];
4413 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
4414 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
afb1d4b5 4415 __rt6_purge_dflt_routers(net, table);
830218c1
DA		 4416 }
4417 }
4418
4419 rcu_read_unlock();
1da177e4
LT		 4420}
4421
5578689a
DL		 4422static void rtmsg_to_fib6_config(struct net *net,
4423 struct in6_rtmsg *rtmsg,
86872cb5
TG		 4424 struct fib6_config *cfg)
4425{
8823a3ac
MŻ		 4426 *cfg = (struct fib6_config){
4427 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
4428 : RT6_TABLE_MAIN,
4429 .fc_ifindex = rtmsg->rtmsg_ifindex,
67f69513 4430 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
8823a3ac
MŻ		 4431 .fc_expires = rtmsg->rtmsg_info,
4432 .fc_dst_len = rtmsg->rtmsg_dst_len,
4433 .fc_src_len = rtmsg->rtmsg_src_len,
4434 .fc_flags = rtmsg->rtmsg_flags,
4435 .fc_type = rtmsg->rtmsg_type,
4436
4437 .fc_nlinfo.nl_net = net,
4438
4439 .fc_dst = rtmsg->rtmsg_dst,
4440 .fc_src = rtmsg->rtmsg_src,
4441 .fc_gateway = rtmsg->rtmsg_gateway,
4442 };
86872cb5
TG		 4443}
4444
7c1552da 4445int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg)
1da177e4 4446{
86872cb5 4447 struct fib6_config cfg;
1da177e4
LT		 4448 int err;
4449
7c1552da
CH		 4450 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
4451 return -EINVAL;
4452 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4453 return -EPERM;
86872cb5 4454
7c1552da 4455 rtmsg_to_fib6_config(net, rtmsg, &cfg);
1da177e4 4456
7c1552da
CH		 4457 rtnl_lock();
4458 switch (cmd) {
4459 case SIOCADDRT:
4460 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
4461 break;
4462 case SIOCDELRT:
4463 err = ip6_route_del(&cfg, NULL);
4464 break;
3ff50b79 4465 }
7c1552da
CH		 4466 rtnl_unlock();
4467 return err;
1da177e4
LT		 4468}
4469
4470/*
4471 * Drop the packet on the floor
4472 */
4473
d5fdd6ba 4474static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 4475{
adf30907 4476 struct dst_entry *dst = skb_dst(skb);
1d3fd8a1
SS		 4477 struct net *net = dev_net(dst->dev);
4478 struct inet6_dev *idev;
3ae42cc8 4479 SKB_DR(reason);
1d3fd8a1
SS		 4480 int type;
4481
1158f79f 4482 if (netif_is_l3_master(skb->dev) ||
1d3fd8a1
SS		 4483 dst->dev == net->loopback_dev)
4484 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
4485 else
4486 idev = ip6_dst_idev(dst);
4487
612f09e8
YH		 4488 switch (ipstats_mib_noroutes) {
4489 case IPSTATS_MIB_INNOROUTES:
0660e03f 4490 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 4491 if (type == IPV6_ADDR_ANY) {
3ae42cc8 4492 SKB_DR_SET(reason, IP_INADDRERRORS);
1d3fd8a1 4493 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 4494 break;
4495 }
3ae42cc8 4496 SKB_DR_SET(reason, IP_INNOROUTES);
a8eceea8 4497 fallthrough;
612f09e8 4498 case IPSTATS_MIB_OUTNOROUTES:
3ae42cc8 4499 SKB_DR_OR(reason, IP_OUTNOROUTES);
1d3fd8a1 4500 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
612f09e8
YH		 4501 break;
4502 }
1d3fd8a1
SS		 4503
4504 /* Start over by dropping the dst for l3mdev case */
4505 if (netif_is_l3_master(skb->dev))
4506 skb_dst_drop(skb);
4507
3ffe533c 4508 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
3ae42cc8 4509 kfree_skb_reason(skb, reason);
1da177e4
LT		 4510 return 0;
4511}
4512
9ce8ade0
TG		 4513static int ip6_pkt_discard(struct sk_buff *skb)
4514{
612f09e8 4515 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 4516}
4517
ede2059d 4518static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 4519{
adf30907 4520 skb->dev = skb_dst(skb)->dev;
612f09e8 4521 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 4522}
4523
9ce8ade0
TG		 4524static int ip6_pkt_prohibit(struct sk_buff *skb)
4525{
612f09e8 4526 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 4527}
4528
ede2059d 4529static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 4530{
adf30907 4531 skb->dev = skb_dst(skb)->dev;
612f09e8 4532 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 4533}
4534
1da177e4
LT		 4535/*
4536 * Allocate a dst for local (unicast / anycast) address.
4537 */
4538
360a9887
DA		 4539struct fib6_info *addrconf_f6i_alloc(struct net *net,
4540 struct inet6_dev *idev,
4541 const struct in6_addr *addr,
4542 bool anycast, gfp_t gfp_flags)
1da177e4 4543{
c7a1ce39
DA		 4544 struct fib6_config cfg = {
4545 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
4546 .fc_ifindex = idev->dev->ifindex,
d55a2e37 4547 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c7a1ce39
DA		 4548 .fc_dst = *addr,
4549 .fc_dst_len = 128,
4550 .fc_protocol = RTPROT_KERNEL,
4551 .fc_nlinfo.nl_net = net,
4552 .fc_ignore_dev_down = true,
4553 };
d55a2e37 4554 struct fib6_info *f6i;
1da177e4 4555
e8478e80 4556 if (anycast) {
c7a1ce39
DA		 4557 cfg.fc_type = RTN_ANYCAST;
4558 cfg.fc_flags |= RTF_ANYCAST;
e8478e80 4559 } else {
c7a1ce39
DA		 4560 cfg.fc_type = RTN_LOCAL;
4561 cfg.fc_flags |= RTF_LOCAL;
e8478e80 4562 }
1da177e4 4563
d55a2e37 4564 f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
3b0dc529 4565 if (!IS_ERR(f6i)) {
d55a2e37 4566 f6i->dst_nocount = true;
3b0dc529
ND		 4567
4568 if (!anycast &&
4569 (net->ipv6.devconf_all->disable_policy ||
4570 idev->cnf.disable_policy))
4571 f6i->dst_nopolicy = true;
4572 }
4573
d55a2e37 4574 return f6i;
1da177e4
LT		 4575}
4576
c3968a85
DW		 4577/* remove deleted ip from prefsrc entries */
4578struct arg_dev_net_ip {
4579 struct net_device *dev;
4580 struct net *net;
4581 struct in6_addr *addr;
4582};
4583
8d1c802b 4584static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
c3968a85
DW		 4585{
4586 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
4587 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
4588 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
4589
f88d8ea6
DA		 4590 if (!rt->nh &&
4591 ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) &&
421842ed 4592 rt != net->ipv6.fib6_null_entry &&
93c2fb25 4593 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
60006a48 4594 spin_lock_bh(&rt6_exception_lock);
c3968a85 4595 /* remove prefsrc entry */
93c2fb25 4596 rt->fib6_prefsrc.plen = 0;
60006a48 4597 spin_unlock_bh(&rt6_exception_lock);
c3968a85
DW		 4598 }
4599 return 0;
4600}
4601
4602void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
4603{
4604 struct net *net = dev_net(ifp->idev->dev);
4605 struct arg_dev_net_ip adni = {
4606 .dev = ifp->idev->dev,
4607 .net = net,
4608 .addr = &ifp->addr,
4609 };
0c3584d5 4610 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 4611}
4612
2b2450ca 4613#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
be7a010d
DJ		 4614
4615/* Remove routers and update dst entries when gateway turn into host. */
8d1c802b 4616static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
be7a010d
DJ		 4617{
4618 struct in6_addr *gateway = (struct in6_addr *)arg;
f88d8ea6
DA		 4619 struct fib6_nh *nh;
4620
4621 /* RA routes do not use nexthops */
4622 if (rt->nh)
4623 return 0;
be7a010d 4624
f88d8ea6 4625 nh = rt->fib6_nh;
93c2fb25 4626 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
cc5c073a 4627 nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6))
be7a010d 4628 return -1;
b16cb459
WW		 4629
4630 /* Further clean up cached routes in exception table.
4631 * This is needed because cached route may have a different
4632 * gateway than its 'parent' in the case of an ip redirect.
4633 */
cc5c073a 4634 fib6_nh_exceptions_clean_tohost(nh, gateway);
b16cb459 4635
be7a010d
DJ		 4636 return 0;
4637}
4638
4639void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
4640{
4641 fib6_clean_all(net, fib6_clean_tohost, gateway);
4642}
4643
2127d95a
IS		 4644struct arg_netdev_event {
4645 const struct net_device *dev;
4c981e28 4646 union {
ecc5663c 4647 unsigned char nh_flags;
4c981e28
IS		 4648 unsigned long event;
4649 };
2127d95a
IS		 4650};
4651
8d1c802b 4652static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
d7dedee1 4653{
8d1c802b 4654 struct fib6_info *iter;
d7dedee1
IS		 4655 struct fib6_node *fn;
4656
93c2fb25
DA		 4657 fn = rcu_dereference_protected(rt->fib6_node,
4658 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 4659 iter = rcu_dereference_protected(fn->leaf,
93c2fb25 4660 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 4661 while (iter) {
93c2fb25 4662 if (iter->fib6_metric == rt->fib6_metric &&
33bd5ac5 4663 rt6_qualify_for_ecmp(iter))
d7dedee1 4664 return iter;
8fb11a9a 4665 iter = rcu_dereference_protected(iter->fib6_next,
93c2fb25 4666 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1
IS		 4667 }
4668
4669 return NULL;
4670}
4671
f88d8ea6 4672/* only called for fib entries with builtin fib6_nh */
8d1c802b 4673static bool rt6_is_dead(const struct fib6_info *rt)
d7dedee1 4674{
1cf844c7
DA		 4675 if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD ||
4676 (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN &&
4677 ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev)))
d7dedee1
IS		 4678 return true;
4679
4680 return false;
4681}
4682
8d1c802b 4683static int rt6_multipath_total_weight(const struct fib6_info *rt)
d7dedee1 4684{
8d1c802b 4685 struct fib6_info *iter;
d7dedee1
IS		 4686 int total = 0;
4687
4688 if (!rt6_is_dead(rt))
1cf844c7 4689 total += rt->fib6_nh->fib_nh_weight;
d7dedee1 4690
93c2fb25 4691 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
d7dedee1 4692 if (!rt6_is_dead(iter))
1cf844c7 4693 total += iter->fib6_nh->fib_nh_weight;
d7dedee1
IS		 4694 }
4695
4696 return total;
4697}
4698
8d1c802b 4699static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
d7dedee1
IS		 4700{
4701 int upper_bound = -1;
4702
4703 if (!rt6_is_dead(rt)) {
1cf844c7 4704 *weight += rt->fib6_nh->fib_nh_weight;
d7dedee1
IS		 4705 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
4706 total) - 1;
4707 }
1cf844c7 4708 atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound);
d7dedee1
IS		 4709}
4710
8d1c802b 4711static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
d7dedee1 4712{
8d1c802b 4713 struct fib6_info *iter;
d7dedee1
IS		 4714 int weight = 0;
4715
4716 rt6_upper_bound_set(rt, &weight, total);
4717
93c2fb25 4718 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
d7dedee1
IS		 4719 rt6_upper_bound_set(iter, &weight, total);
4720}
4721
8d1c802b 4722void rt6_multipath_rebalance(struct fib6_info *rt)
d7dedee1 4723{
8d1c802b 4724 struct fib6_info *first;
d7dedee1
IS		 4725 int total;
4726
4727 /* In case the entire multipath route was marked for flushing,
4728 * then there is no need to rebalance upon the removal of every
4729 * sibling route.
4730 */
93c2fb25 4731 if (!rt->fib6_nsiblings || rt->should_flush)
d7dedee1
IS		 4732 return;
4733
4734 /* During lookup routes are evaluated in order, so we need to
4735 * make sure upper bounds are assigned from the first sibling
4736 * onwards.
4737 */
4738 first = rt6_multipath_first_sibling(rt);
4739 if (WARN_ON_ONCE(!first))
4740 return;
4741
4742 total = rt6_multipath_total_weight(first);
4743 rt6_multipath_upper_bound_set(first, total);
4744}
4745
8d1c802b 4746static int fib6_ifup(struct fib6_info *rt, void *p_arg)
2127d95a
IS		 4747{
4748 const struct arg_netdev_event *arg = p_arg;
7aef6859 4749 struct net *net = dev_net(arg->dev);
2127d95a 4750
f88d8ea6 4751 if (rt != net->ipv6.fib6_null_entry && !rt->nh &&
1cf844c7
DA		 4752 rt->fib6_nh->fib_nh_dev == arg->dev) {
4753 rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags;
7aef6859 4754 fib6_update_sernum_upto_root(net, rt);
d7dedee1 4755 rt6_multipath_rebalance(rt);
1de178ed 4756 }
2127d95a
IS		 4757
4758 return 0;
4759}
4760
ecc5663c 4761void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
2127d95a
IS		 4762{
4763 struct arg_netdev_event arg = {
4764 .dev = dev,
6802f3ad
IS		 4765 {
4766 .nh_flags = nh_flags,
4767 },
2127d95a
IS		 4768 };
4769
4770 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4771 arg.nh_flags |= RTNH_F_LINKDOWN;
4772
4773 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4774}
4775
f88d8ea6 4776/* only called for fib entries with inline fib6_nh */
8d1c802b 4777static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
1de178ed
IS		 4778 const struct net_device *dev)
4779{
8d1c802b 4780 struct fib6_info *iter;
1de178ed 4781
1cf844c7 4782 if (rt->fib6_nh->fib_nh_dev == dev)
1de178ed 4783 return true;
93c2fb25 4784 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7 4785 if (iter->fib6_nh->fib_nh_dev == dev)
1de178ed
IS		 4786 return true;
4787
4788 return false;
4789}
4790
8d1c802b 4791static void rt6_multipath_flush(struct fib6_info *rt)
1de178ed 4792{
8d1c802b 4793 struct fib6_info *iter;
1de178ed
IS		 4794
4795 rt->should_flush = 1;
93c2fb25 4796 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1de178ed
IS		 4797 iter->should_flush = 1;
4798}
4799
8d1c802b 4800static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
1de178ed
IS		 4801 const struct net_device *down_dev)
4802{
8d1c802b 4803 struct fib6_info *iter;
1de178ed
IS		 4804 unsigned int dead = 0;
4805
1cf844c7
DA		 4806 if (rt->fib6_nh->fib_nh_dev == down_dev ||
4807 rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
1de178ed 4808 dead++;
93c2fb25 4809 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7
DA		 4810 if (iter->fib6_nh->fib_nh_dev == down_dev ||
4811 iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
1de178ed
IS		 4812 dead++;
4813
4814 return dead;
4815}
4816
8d1c802b 4817static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
1de178ed 4818 const struct net_device *dev,
ecc5663c 4819 unsigned char nh_flags)
1de178ed 4820{
8d1c802b 4821 struct fib6_info *iter;
1de178ed 4822
1cf844c7
DA		 4823 if (rt->fib6_nh->fib_nh_dev == dev)
4824 rt->fib6_nh->fib_nh_flags |= nh_flags;
93c2fb25 4825 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7
DA		 4826 if (iter->fib6_nh->fib_nh_dev == dev)
4827 iter->fib6_nh->fib_nh_flags |= nh_flags;
1de178ed
IS		 4828}
4829
a1a22c12 4830/* called with write lock held for table with rt */
8d1c802b 4831static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
1da177e4 4832{
4c981e28
IS		 4833 const struct arg_netdev_event *arg = p_arg;
4834 const struct net_device *dev = arg->dev;
7aef6859 4835 struct net *net = dev_net(dev);
8ed67789 4836
f88d8ea6 4837 if (rt == net->ipv6.fib6_null_entry || rt->nh)
27c6fa73
IS		 4838 return 0;
4839
4840 switch (arg->event) {
4841 case NETDEV_UNREGISTER:
1cf844c7 4842 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
27c6fa73 4843 case NETDEV_DOWN:
1de178ed 4844 if (rt->should_flush)
27c6fa73 4845 return -1;
93c2fb25 4846 if (!rt->fib6_nsiblings)
1cf844c7 4847 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
1de178ed
IS		 4848 if (rt6_multipath_uses_dev(rt, dev)) {
4849 unsigned int count;
4850
4851 count = rt6_multipath_dead_count(rt, dev);
93c2fb25 4852 if (rt->fib6_nsiblings + 1 == count) {
1de178ed
IS		 4853 rt6_multipath_flush(rt);
4854 return -1;
4855 }
4856 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4857 RTNH_F_LINKDOWN);
7aef6859 4858 fib6_update_sernum(net, rt);
d7dedee1 4859 rt6_multipath_rebalance(rt);
1de178ed
IS		 4860 }
4861 return -2;
27c6fa73 4862 case NETDEV_CHANGE:
1cf844c7 4863 if (rt->fib6_nh->fib_nh_dev != dev ||
93c2fb25 4864 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
27c6fa73 4865 break;
1cf844c7 4866 rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
d7dedee1 4867 rt6_multipath_rebalance(rt);
27c6fa73 4868 break;
2b241361 4869 }
c159d30c 4870
1da177e4
LT		 4871 return 0;
4872}
4873
27c6fa73 4874void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
1da177e4 4875{
4c981e28 4876 struct arg_netdev_event arg = {
8ed67789 4877 .dev = dev,
6802f3ad
IS		 4878 {
4879 .event = event,
4880 },
8ed67789 4881 };
7c6bb7d2 4882 struct net *net = dev_net(dev);
8ed67789 4883
7c6bb7d2
DA		 4884 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4885 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4886 else
4887 fib6_clean_all(net, fib6_ifdown, &arg);
4c981e28
IS		 4888}
4889
4890void rt6_disable_ip(struct net_device *dev, unsigned long event)
4891{
4892 rt6_sync_down_dev(dev, event);
e5f80fcf 4893 rt6_uncached_list_flush_dev(dev);
4c981e28 4894 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 4895}
4896
95c96174 4897struct rt6_mtu_change_arg {
1da177e4 4898 struct net_device *dev;
95c96174 4899 unsigned int mtu;
c0b220cf 4900 struct fib6_info *f6i;
1da177e4
LT		 4901};
4902
cc5c073a 4903static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg)
c0b220cf
DA		 4904{
4905 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg;
cc5c073a 4906 struct fib6_info *f6i = arg->f6i;
c0b220cf
DA		 4907
4908 /* For administrative MTU increase, there is no way to discover
4909 * IPv6 PMTU increase, so PMTU increase should be updated here.
4910 * Since RFC 1981 doesn't include administrative MTU increase
4911 * update PMTU increase is a MUST. (i.e. jumbo frame)
4912 */
4913 if (nh->fib_nh_dev == arg->dev) {
4914 struct inet6_dev *idev = __in6_dev_get(arg->dev);
4915 u32 mtu = f6i->fib6_pmtu;
4916
4917 if (mtu >= arg->mtu ||
4918 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4919 fib6_metric_set(f6i, RTAX_MTU, arg->mtu);
4920
4921 spin_lock_bh(&rt6_exception_lock);
cc5c073a 4922 rt6_exceptions_update_pmtu(idev, nh, arg->mtu);
c0b220cf
DA		 4923 spin_unlock_bh(&rt6_exception_lock);
4924 }
4925
4926 return 0;
4927}
4928
4929static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
1da177e4
LT		 4930{
4931 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4932 struct inet6_dev *idev;
4933
4934 /* In IPv6 pmtu discovery is not optional,
4935 so that RTAX_MTU lock cannot disable it.
4936 We still use this lock to block changes
4937 caused by addrconf/ndisc.
4938 */
4939
4940 idev = __in6_dev_get(arg->dev);
38308473 4941 if (!idev)
1da177e4
LT		 4942 return 0;
4943
c0b220cf
DA		 4944 if (fib6_metric_locked(f6i, RTAX_MTU))
4945 return 0;
d4ead6b3 4946
c0b220cf 4947 arg->f6i = f6i;
2d44234b
DA		 4948 if (f6i->nh) {
4949 /* fib6_nh_mtu_change only returns 0, so this is safe */
4950 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change,
4951 arg);
4952 }
4953
1cf844c7 4954 return fib6_nh_mtu_change(f6i->fib6_nh, arg);
1da177e4
LT		 4955}
4956
95c96174 4957void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 4958{
c71099ac
TG		 4959 struct rt6_mtu_change_arg arg = {
4960 .dev = dev,
4961 .mtu = mtu,
4962 };
1da177e4 4963
0c3584d5 4964 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 4965}
4966
ef7c79ed 4967static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
75425657 4968 [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
5176f91e 4969 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
aa8f8778 4970 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
86872cb5 4971 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 4972 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 4973 [RTA_PRIORITY] = { .type = NLA_U32 },
4974 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 4975 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 4976 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 4977 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4978 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 4979 [RTA_EXPIRES] = { .type = NLA_U32 },
622ec2c9 4980 [RTA_UID] = { .type = NLA_U32 },
3b45a410 4981 [RTA_MARK] = { .type = NLA_U32 },
aa8f8778 4982 [RTA_TABLE] = { .type = NLA_U32 },
eacb9384
RP		 4983 [RTA_IP_PROTO] = { .type = NLA_U8 },
4984 [RTA_SPORT] = { .type = NLA_U16 },
4985 [RTA_DPORT] = { .type = NLA_U16 },
5b98324e 4986 [RTA_NH_ID] = { .type = NLA_U32 },
86872cb5
TG		 4987};
4988
4989static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
333c4301
DA		 4990 struct fib6_config *cfg,
4991 struct netlink_ext_ack *extack)
1da177e4 4992{
86872cb5
TG		 4993 struct rtmsg *rtm;
4994 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 4995 unsigned int pref;
86872cb5 4996 int err;
1da177e4 4997
8cb08174
JB		 4998 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
4999 rtm_ipv6_policy, extack);
86872cb5
TG		 5000 if (err < 0)
5001 goto errout;
1da177e4 5002
86872cb5
TG		 5003 err = -EINVAL;
5004 rtm = nlmsg_data(nlh);
86872cb5 5005
b9605161
GN		 5006 if (rtm->rtm_tos) {
5007 NL_SET_ERR_MSG(extack,
5008 "Invalid dsfield (tos): option not available for IPv6");
5009 goto errout;
5010 }
5011
84db8407
MŻ		 5012 *cfg = (struct fib6_config){
5013 .fc_table = rtm->rtm_table,
5014 .fc_dst_len = rtm->rtm_dst_len,
5015 .fc_src_len = rtm->rtm_src_len,
5016 .fc_flags = RTF_UP,
5017 .fc_protocol = rtm->rtm_protocol,
5018 .fc_type = rtm->rtm_type,
5019
5020 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
5021 .fc_nlinfo.nlh = nlh,
5022 .fc_nlinfo.nl_net = sock_net(skb->sk),
5023 };
86872cb5 5024
ef2c7d7b
ND		 5025 if (rtm->rtm_type == RTN_UNREACHABLE ||
5026 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 5027 rtm->rtm_type == RTN_PROHIBIT ||
5028 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 5029 cfg->fc_flags |= RTF_REJECT;
5030
ab79ad14
MŻ		 5031 if (rtm->rtm_type == RTN_LOCAL)
5032 cfg->fc_flags |= RTF_LOCAL;
5033
1f56a01f
MKL		 5034 if (rtm->rtm_flags & RTM_F_CLONED)
5035 cfg->fc_flags |= RTF_CACHE;
5036
fc1e64e1
DA		 5037 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
5038
5b98324e
DA		 5039 if (tb[RTA_NH_ID]) {
5040 if (tb[RTA_GATEWAY] || tb[RTA_OIF] ||
5041 tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) {
5042 NL_SET_ERR_MSG(extack,
5043 "Nexthop specification and nexthop id are mutually exclusive");
5044 goto errout;
5045 }
5046 cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]);
5047 }
5048
86872cb5 5049 if (tb[RTA_GATEWAY]) {
67b61f6c 5050 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 5051 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 5052 }
e3818541
DA		 5053 if (tb[RTA_VIA]) {
5054 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
5055 goto errout;
5056 }
86872cb5
TG		 5057
5058 if (tb[RTA_DST]) {
5059 int plen = (rtm->rtm_dst_len + 7) >> 3;
5060
5061 if (nla_len(tb[RTA_DST]) < plen)
5062 goto errout;
5063
5064 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 5065 }
86872cb5
TG		 5066
5067 if (tb[RTA_SRC]) {
5068 int plen = (rtm->rtm_src_len + 7) >> 3;
5069
5070 if (nla_len(tb[RTA_SRC]) < plen)
5071 goto errout;
5072
5073 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 5074 }
86872cb5 5075
c3968a85 5076 if (tb[RTA_PREFSRC])
67b61f6c 5077 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 5078
86872cb5
TG		 5079 if (tb[RTA_OIF])
5080 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
5081
5082 if (tb[RTA_PRIORITY])
5083 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
5084
5085 if (tb[RTA_METRICS]) {
5086 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
5087 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 5088 }
86872cb5
TG		 5089
5090 if (tb[RTA_TABLE])
5091 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
5092
51ebd318
ND		 5093 if (tb[RTA_MULTIPATH]) {
5094 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
5095 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
9ed59592
DA		 5096
5097 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
c255bd68 5098 cfg->fc_mp_len, extack);
9ed59592
DA		 5099 if (err < 0)
5100 goto errout;
51ebd318
ND		 5101 }
5102
c78ba6d6
LR		 5103 if (tb[RTA_PREF]) {
5104 pref = nla_get_u8(tb[RTA_PREF]);
5105 if (pref != ICMPV6_ROUTER_PREF_LOW &&
5106 pref != ICMPV6_ROUTER_PREF_HIGH)
5107 pref = ICMPV6_ROUTER_PREF_MEDIUM;
5108 cfg->fc_flags |= RTF_PREF(pref);
5109 }
5110
19e42e45
RP		 5111 if (tb[RTA_ENCAP])
5112 cfg->fc_encap = tb[RTA_ENCAP];
5113
9ed59592 5114 if (tb[RTA_ENCAP_TYPE]) {
19e42e45
RP		 5115 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
5116
c255bd68 5117 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
9ed59592
DA		 5118 if (err < 0)
5119 goto errout;
5120 }
5121
32bc201e
XL		 5122 if (tb[RTA_EXPIRES]) {
5123 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
5124
5125 if (addrconf_finite_timeout(timeout)) {
5126 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
5127 cfg->fc_flags |= RTF_EXPIRES;
5128 }
5129 }
5130
86872cb5
TG		 5131 err = 0;
5132errout:
5133 return err;
1da177e4
LT		 5134}
5135
6b9ea5a6 5136struct rt6_nh {
8d1c802b 5137 struct fib6_info *fib6_info;
6b9ea5a6 5138 struct fib6_config r_cfg;
6b9ea5a6
RP		 5139 struct list_head next;
5140};
5141
d4ead6b3
DA		 5142static int ip6_route_info_append(struct net *net,
5143 struct list_head *rt6_nh_list,
8d1c802b
DA		 5144 struct fib6_info *rt,
5145 struct fib6_config *r_cfg)
6b9ea5a6
RP		 5146{
5147 struct rt6_nh *nh;
6b9ea5a6
RP		 5148 int err = -EEXIST;
5149
5150 list_for_each_entry(nh, rt6_nh_list, next) {
8d1c802b
DA		 5151 /* check if fib6_info already exists */
5152 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
6b9ea5a6
RP		 5153 return err;
5154 }
5155
5156 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
5157 if (!nh)
5158 return -ENOMEM;
8d1c802b 5159 nh->fib6_info = rt;
6b9ea5a6
RP		 5160 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
5161 list_add_tail(&nh->next, rt6_nh_list);
5162
5163 return 0;
5164}
5165
8d1c802b
DA		 5166static void ip6_route_mpath_notify(struct fib6_info *rt,
5167 struct fib6_info *rt_last,
3b1137fe
DA		 5168 struct nl_info *info,
5169 __u16 nlflags)
5170{
5171 /* if this is an APPEND route, then rt points to the first route
5172 * inserted and rt_last points to last route inserted. Userspace
5173 * wants a consistent dump of the route which starts at the first
5174 * nexthop. Since sibling routes are always added at the end of
5175 * the list, find the first sibling of the last route appended
5176 */
93c2fb25
DA		 5177 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
5178 rt = list_first_entry(&rt_last->fib6_siblings,
8d1c802b 5179 struct fib6_info,
93c2fb25 5180 fib6_siblings);
3b1137fe
DA		 5181 }
5182
5183 if (rt)
5184 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
5185}
5186
0ee0f47c
IS		 5187static bool ip6_route_mpath_should_notify(const struct fib6_info *rt)
5188{
5189 bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
5190 bool should_notify = false;
5191 struct fib6_info *leaf;
5192 struct fib6_node *fn;
5193
5194 rcu_read_lock();
5195 fn = rcu_dereference(rt->fib6_node);
5196 if (!fn)
5197 goto out;
5198
5199 leaf = rcu_dereference(fn->leaf);
5200 if (!leaf)
5201 goto out;
5202
5203 if (rt == leaf ||
5204 (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric &&
5205 rt6_qualify_for_ecmp(leaf)))
5206 should_notify = true;
5207out:
5208 rcu_read_unlock();
5209
5210 return should_notify;
5211}
5212
4619bcf9
DA		 5213static int fib6_gw_from_attr(struct in6_addr *gw, struct nlattr *nla,
5214 struct netlink_ext_ack *extack)
5215{
5216 if (nla_len(nla) < sizeof(*gw)) {
5217 NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_GATEWAY");
5218 return -EINVAL;
5219 }
5220
5221 *gw = nla_get_in6_addr(nla);
5222
5223 return 0;
5224}
5225
333c4301
DA		 5226static int ip6_route_multipath_add(struct fib6_config *cfg,
5227 struct netlink_ext_ack *extack)
51ebd318 5228{
8d1c802b 5229 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
3b1137fe 5230 struct nl_info *info = &cfg->fc_nlinfo;
51ebd318
ND		 5231 struct fib6_config r_cfg;
5232 struct rtnexthop *rtnh;
8d1c802b 5233 struct fib6_info *rt;
6b9ea5a6
RP		 5234 struct rt6_nh *err_nh;
5235 struct rt6_nh *nh, *nh_safe;
3b1137fe 5236 __u16 nlflags;
51ebd318
ND		 5237 int remaining;
5238 int attrlen;
6b9ea5a6
RP		 5239 int err = 1;
5240 int nhn = 0;
5241 int replace = (cfg->fc_nlinfo.nlh &&
5242 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
5243 LIST_HEAD(rt6_nh_list);
51ebd318 5244
3b1137fe
DA		 5245 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
5246 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
5247 nlflags |= NLM_F_APPEND;
5248
35f1b4e9 5249 remaining = cfg->fc_mp_len;
51ebd318 5250 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 5251
6b9ea5a6 5252 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
8d1c802b 5253 * fib6_info structs per nexthop
6b9ea5a6 5254 */
51ebd318
ND		 5255 while (rtnh_ok(rtnh, remaining)) {
5256 memcpy(&r_cfg, cfg, sizeof(*cfg));
5257 if (rtnh->rtnh_ifindex)
5258 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5259
5260 attrlen = rtnh_attrlen(rtnh);
5261 if (attrlen > 0) {
5262 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5263
5264 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5265 if (nla) {
95bdba23 5266 err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla,
4619bcf9 5267 extack);
95bdba23
DA		 5268 if (err)
5269 goto cleanup;
4619bcf9 5270
51ebd318
ND		 5271 r_cfg.fc_flags |= RTF_GATEWAY;
5272 }
19e42e45 5273 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
8bda81a4
DA		 5274
5275 /* RTA_ENCAP_TYPE length checked in
5276 * lwtunnel_valid_encap_type_attr
5277 */
19e42e45
RP		 5278 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
5279 if (nla)
5280 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 5281 }
6b9ea5a6 5282
68e2ffde 5283 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
acb54e3c 5284 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
8c5b83f0
RP		 5285 if (IS_ERR(rt)) {
5286 err = PTR_ERR(rt);
5287 rt = NULL;
6b9ea5a6 5288 goto cleanup;
8c5b83f0 5289 }
b5d2d75e
DA		 5290 if (!rt6_qualify_for_ecmp(rt)) {
5291 err = -EINVAL;
5292 NL_SET_ERR_MSG(extack,
5293 "Device only routes can not be added for IPv6 using the multipath API.");
5294 fib6_info_release(rt);
5295 goto cleanup;
5296 }
6b9ea5a6 5297
1cf844c7 5298 rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1;
398958ae 5299
d4ead6b3
DA		 5300 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
5301 rt, &r_cfg);
51ebd318 5302 if (err) {
93531c67 5303 fib6_info_release(rt);
6b9ea5a6
RP		 5304 goto cleanup;
5305 }
5306
5307 rtnh = rtnh_next(rtnh, &remaining);
5308 }
5309
9eee3b49
IS		 5310 if (list_empty(&rt6_nh_list)) {
5311 NL_SET_ERR_MSG(extack,
5312 "Invalid nexthop configuration - no valid nexthops");
5313 return -EINVAL;
5314 }
5315
3b1137fe
DA		 5316 /* for add and replace send one notification with all nexthops.
5317 * Skip the notification in fib6_add_rt2node and send one with
5318 * the full route when done
5319 */
5320 info->skip_notify = 1;
5321
ebee3cad
IS		 5322 /* For add and replace, send one notification with all nexthops. For
5323 * append, send one notification with all appended nexthops.
5324 */
5325 info->skip_notify_kernel = 1;
5326
6b9ea5a6
RP		 5327 err_nh = NULL;
5328 list_for_each_entry(nh, &rt6_nh_list, next) {
8d1c802b
DA		 5329 err = __ip6_ins_rt(nh->fib6_info, info, extack);
5330 fib6_info_release(nh->fib6_info);
93531c67 5331
f7225172
DA		 5332 if (!err) {
5333 /* save reference to last route successfully inserted */
5334 rt_last = nh->fib6_info;
5335
5336 /* save reference to first route for notification */
5337 if (!rt_notif)
5338 rt_notif = nh->fib6_info;
5339 }
3b1137fe 5340
8d1c802b
DA		 5341 /* nh->fib6_info is used or freed at this point, reset to NULL*/
5342 nh->fib6_info = NULL;
6b9ea5a6
RP		 5343 if (err) {
5344 if (replace && nhn)
a5a82d84
JK		 5345 NL_SET_ERR_MSG_MOD(extack,
5346 "multipath route replace failed (check consistency of installed routes)");
6b9ea5a6
RP		 5347 err_nh = nh;
5348 goto add_errout;
51ebd318 5349 }
6b9ea5a6 5350
1a72418b 5351 /* Because each route is added like a single route we remove
27596472
MK		 5352 * these flags after the first nexthop: if there is a collision,
5353 * we have already failed to add the first nexthop:
5354 * fib6_add_rt2node() has rejected it; when replacing, old
5355 * nexthops have been replaced by first new, the rest should
5356 * be added to it.
1a72418b 5357 */
864db232
MUA		 5358 if (cfg->fc_nlinfo.nlh) {
5359 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
5360 NLM_F_REPLACE);
5361 cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
5362 }
6b9ea5a6
RP		 5363 nhn++;
5364 }
5365
0ee0f47c
IS		 5366 /* An in-kernel notification should only be sent in case the new
5367 * multipath route is added as the first route in the node, or if
5368 * it was appended to it. We pass 'rt_notif' since it is the first
5369 * sibling and might allow us to skip some checks in the replace case.
5370 */
5371 if (ip6_route_mpath_should_notify(rt_notif)) {
5372 enum fib_event_type fib_event;
5373
5374 if (rt_notif->fib6_nsiblings != nhn - 1)
5375 fib_event = FIB_EVENT_ENTRY_APPEND;
5376 else
caafb250 5377 fib_event = FIB_EVENT_ENTRY_REPLACE;
0ee0f47c
IS		 5378
5379 err = call_fib6_multipath_entry_notifiers(info->nl_net,
5380 fib_event, rt_notif,
5381 nhn - 1, extack);
5382 if (err) {
5383 /* Delete all the siblings that were just added */
5384 err_nh = NULL;
5385 goto add_errout;
5386 }
5387 }
ebee3cad 5388
3b1137fe
DA		 5389 /* success ... tell user about new route */
5390 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
6b9ea5a6
RP		 5391 goto cleanup;
5392
5393add_errout:
3b1137fe
DA		 5394 /* send notification for routes that were added so that
5395 * the delete notifications sent by ip6_route_del are
5396 * coherent
5397 */
5398 if (rt_notif)
5399 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5400
6b9ea5a6
RP		 5401 /* Delete routes that were already added */
5402 list_for_each_entry(nh, &rt6_nh_list, next) {
5403 if (err_nh == nh)
5404 break;
333c4301 5405 ip6_route_del(&nh->r_cfg, extack);
6b9ea5a6
RP		 5406 }
5407
5408cleanup:
5409 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
8d1c802b
DA		 5410 if (nh->fib6_info)
5411 fib6_info_release(nh->fib6_info);
6b9ea5a6
RP		 5412 list_del(&nh->next);
5413 kfree(nh);
5414 }
5415
5416 return err;
5417}
5418
333c4301
DA		 5419static int ip6_route_multipath_del(struct fib6_config *cfg,
5420 struct netlink_ext_ack *extack)
6b9ea5a6
RP		 5421{
5422 struct fib6_config r_cfg;
5423 struct rtnexthop *rtnh;
2291267e 5424 int last_err = 0;
6b9ea5a6
RP		 5425 int remaining;
5426 int attrlen;
2291267e 5427 int err;
6b9ea5a6
RP		 5428
5429 remaining = cfg->fc_mp_len;
5430 rtnh = (struct rtnexthop *)cfg->fc_mp;
5431
5432 /* Parse a Multipath Entry */
5433 while (rtnh_ok(rtnh, remaining)) {
5434 memcpy(&r_cfg, cfg, sizeof(*cfg));
5435 if (rtnh->rtnh_ifindex)
5436 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5437
5438 attrlen = rtnh_attrlen(rtnh);
5439 if (attrlen > 0) {
5440 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5441
5442 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5443 if (nla) {
1ff15a71
DA		 5444 err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla,
5445 extack);
e30a845b
DA		 5446 if (err) {
5447 last_err = err;
5448 goto next_rtnh;
5449 }
1ff15a71 5450
6b9ea5a6
RP		 5451 r_cfg.fc_flags |= RTF_GATEWAY;
5452 }
5453 }
333c4301 5454 err = ip6_route_del(&r_cfg, extack);
6b9ea5a6
RP		 5455 if (err)
5456 last_err = err;
5457
e30a845b 5458next_rtnh:
51ebd318
ND		 5459 rtnh = rtnh_next(rtnh, &remaining);
5460 }
5461
5462 return last_err;
5463}
5464
c21ef3e3
DA		 5465static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5466 struct netlink_ext_ack *extack)
1da177e4 5467{
86872cb5
TG		 5468 struct fib6_config cfg;
5469 int err;
1da177e4 5470
333c4301 5471 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 5472 if (err < 0)
5473 return err;
5474
5b98324e
DA		 5475 if (cfg.fc_nh_id &&
5476 !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) {
5477 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
5478 return -EINVAL;
5479 }
5480
51ebd318 5481 if (cfg.fc_mp)
333c4301 5482 return ip6_route_multipath_del(&cfg, extack);
0ae81335
DA		 5483 else {
5484 cfg.fc_delete_all_nh = 1;
333c4301 5485 return ip6_route_del(&cfg, extack);
0ae81335 5486 }
1da177e4
LT		 5487}
5488
c21ef3e3
DA		 5489static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5490 struct netlink_ext_ack *extack)
1da177e4 5491{
86872cb5
TG		 5492 struct fib6_config cfg;
5493 int err;
1da177e4 5494
333c4301 5495 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 5496 if (err < 0)
5497 return err;
5498
67f69513
DA		 5499 if (cfg.fc_metric == 0)
5500 cfg.fc_metric = IP6_RT_PRIO_USER;
5501
51ebd318 5502 if (cfg.fc_mp)
333c4301 5503 return ip6_route_multipath_add(&cfg, extack);
51ebd318 5504 else
acb54e3c 5505 return ip6_route_add(&cfg, GFP_KERNEL, extack);
1da177e4
LT		 5506}
5507
a1b7a1f0
DA		 5508/* add the overhead of this fib6_nh to nexthop_len */
5509static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg)
339bf98f 5510{
a1b7a1f0 5511 int *nexthop_len = arg;
beb1afac 5512
a1b7a1f0
DA		 5513 *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */
5514 + NLA_ALIGN(sizeof(struct rtnexthop))
5515 + nla_total_size(16); /* RTA_GATEWAY */
5516
5517 if (nh->fib_nh_lws) {
5518 /* RTA_ENCAP_TYPE */
5519 *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5520 /* RTA_ENCAP */
5521 *nexthop_len += nla_total_size(2);
5522 }
f88d8ea6 5523
a1b7a1f0
DA		 5524 return 0;
5525}
beb1afac 5526
a1b7a1f0
DA		 5527static size_t rt6_nlmsg_size(struct fib6_info *f6i)
5528{
5529 int nexthop_len;
5530
5531 if (f6i->nh) {
5532 nexthop_len = nla_total_size(4); /* RTA_NH_ID */
5533 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size,
5534 &nexthop_len);
5535 } else {
4cc59f38 5536 struct fib6_info *sibling, *next_sibling;
a1b7a1f0
DA		 5537 struct fib6_nh *nh = f6i->fib6_nh;
5538
5539 nexthop_len = 0;
5540 if (f6i->fib6_nsiblings) {
4cc59f38 5541 rt6_nh_nlmsg_size(nh, &nexthop_len);
a1b7a1f0 5542
4cc59f38
LW		 5543 list_for_each_entry_safe(sibling, next_sibling,
5544 &f6i->fib6_siblings, fib6_siblings) {
5545 rt6_nh_nlmsg_size(sibling->fib6_nh, &nexthop_len);
5546 }
a1b7a1f0
DA		 5547 }
5548 nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
beb1afac
DA		 5549 }
5550
339bf98f
TG		 5551 return NLMSG_ALIGN(sizeof(struct rtmsg))
5552 + nla_total_size(16) /* RTA_SRC */
5553 + nla_total_size(16) /* RTA_DST */
5554 + nla_total_size(16) /* RTA_GATEWAY */
5555 + nla_total_size(16) /* RTA_PREFSRC */
5556 + nla_total_size(4) /* RTA_TABLE */
5557 + nla_total_size(4) /* RTA_IIF */
5558 + nla_total_size(4) /* RTA_OIF */
5559 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 5560 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 5561 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 5562 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 5563 + nla_total_size(1) /* RTA_PREF */
beb1afac
DA		 5564 + nexthop_len;
5565}
5566
f88d8ea6
DA		 5567static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh,
5568 unsigned char *flags)
5569{
5570 if (nexthop_is_multipath(nh)) {
5571 struct nlattr *mp;
5572
4255ff05 5573 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
f88d8ea6
DA		 5574 if (!mp)
5575 goto nla_put_failure;
5576
7bdf4de1 5577 if (nexthop_mpath_fill_node(skb, nh, AF_INET6))
f88d8ea6
DA		 5578 goto nla_put_failure;
5579
5580 nla_nest_end(skb, mp);
5581 } else {
5582 struct fib6_nh *fib6_nh;
5583
5584 fib6_nh = nexthop_fib6_nh(nh);
7bdf4de1 5585 if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6,
f88d8ea6
DA		 5586 flags, false) < 0)
5587 goto nla_put_failure;
5588 }
5589
5590 return 0;
5591
5592nla_put_failure:
5593 return -EMSGSIZE;
5594}
5595
d4ead6b3 5596static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 5597 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 5598 struct in6_addr *dest, struct in6_addr *src,
15e47304 5599 int iif, int type, u32 portid, u32 seq,
f8cfe2ce 5600 unsigned int flags)
1da177e4 5601{
22d0bd82
XL		 5602 struct rt6_info *rt6 = (struct rt6_info *)dst;
5603 struct rt6key *rt6_dst, *rt6_src;
5604 u32 *pmetrics, table, rt6_flags;
f88d8ea6 5605 unsigned char nh_flags = 0;
2d7202bf 5606 struct nlmsghdr *nlh;
22d0bd82 5607 struct rtmsg *rtm;
d4ead6b3 5608 long expires = 0;
1da177e4 5609
15e47304 5610 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 5611 if (!nlh)
26932566 5612 return -EMSGSIZE;
2d7202bf 5613
22d0bd82
XL		 5614 if (rt6) {
5615 rt6_dst = &rt6->rt6i_dst;
5616 rt6_src = &rt6->rt6i_src;
5617 rt6_flags = rt6->rt6i_flags;
5618 } else {
5619 rt6_dst = &rt->fib6_dst;
5620 rt6_src = &rt->fib6_src;
5621 rt6_flags = rt->fib6_flags;
5622 }
5623
2d7202bf 5624 rtm = nlmsg_data(nlh);
1da177e4 5625 rtm->rtm_family = AF_INET6;
22d0bd82
XL		 5626 rtm->rtm_dst_len = rt6_dst->plen;
5627 rtm->rtm_src_len = rt6_src->plen;
1da177e4 5628 rtm->rtm_tos = 0;
93c2fb25
DA		 5629 if (rt->fib6_table)
5630 table = rt->fib6_table->tb6_id;
c71099ac 5631 else
9e762a4a 5632 table = RT6_TABLE_UNSPEC;
97f0082a 5633 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
c78679e8
DM		 5634 if (nla_put_u32(skb, RTA_TABLE, table))
5635 goto nla_put_failure;
e8478e80
DA		 5636
5637 rtm->rtm_type = rt->fib6_type;
1da177e4
LT		 5638 rtm->rtm_flags = 0;
5639 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
93c2fb25 5640 rtm->rtm_protocol = rt->fib6_protocol;
1da177e4 5641
22d0bd82 5642 if (rt6_flags & RTF_CACHE)
1da177e4
LT		 5643 rtm->rtm_flags |= RTM_F_CLONED;
5644
d4ead6b3
DA		 5645 if (dest) {
5646 if (nla_put_in6_addr(skb, RTA_DST, dest))
c78679e8 5647 goto nla_put_failure;
1ab1457c 5648 rtm->rtm_dst_len = 128;
1da177e4 5649 } else if (rtm->rtm_dst_len)
22d0bd82 5650 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
c78679e8 5651 goto nla_put_failure;
1da177e4
LT		 5652#ifdef CONFIG_IPV6_SUBTREES
5653 if (src) {
930345ea 5654 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 5655 goto nla_put_failure;
1ab1457c 5656 rtm->rtm_src_len = 128;
c78679e8 5657 } else if (rtm->rtm_src_len &&
22d0bd82 5658 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
c78679e8 5659 goto nla_put_failure;
1da177e4 5660#endif
7bc570c8
YH		 5661 if (iif) {
5662#ifdef CONFIG_IPV6_MROUTE
22d0bd82 5663 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
fd61c6ba
DA		 5664 int err = ip6mr_get_route(net, skb, rtm, portid);
5665
5666 if (err == 0)
5667 return 0;
5668 if (err < 0)
5669 goto nla_put_failure;
7bc570c8
YH		 5670 } else
5671#endif
c78679e8
DM		 5672 if (nla_put_u32(skb, RTA_IIF, iif))
5673 goto nla_put_failure;
d4ead6b3 5674 } else if (dest) {
1da177e4 5675 struct in6_addr saddr_buf;
d4ead6b3 5676 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
930345ea 5677 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 5678 goto nla_put_failure;
1da177e4 5679 }
2d7202bf 5680
93c2fb25 5681 if (rt->fib6_prefsrc.plen) {
c3968a85 5682 struct in6_addr saddr_buf;
93c2fb25 5683 saddr_buf = rt->fib6_prefsrc.addr;
930345ea 5684 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 5685 goto nla_put_failure;
c3968a85
DW		 5686 }
5687
d4ead6b3
DA		 5688 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
5689 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
2d7202bf
TG		 5690 goto nla_put_failure;
5691
93c2fb25 5692 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
c78679e8 5693 goto nla_put_failure;
8253947e 5694
beb1afac
DA		 5695 /* For multipath routes, walk the siblings list and add
5696 * each as a nexthop within RTA_MULTIPATH.
5697 */
22d0bd82
XL		 5698 if (rt6) {
5699 if (rt6_flags & RTF_GATEWAY &&
5700 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
5701 goto nla_put_failure;
5702
5703 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
5704 goto nla_put_failure;
6b13d8f7
OH		 5705
5706 if (dst->lwtstate &&
5707 lwtunnel_fill_encap(skb, dst->lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0)
5708 goto nla_put_failure;
22d0bd82 5709 } else if (rt->fib6_nsiblings) {
8d1c802b 5710 struct fib6_info *sibling, *next_sibling;
beb1afac
DA		 5711 struct nlattr *mp;
5712
ae0be8de 5713 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
beb1afac
DA		 5714 if (!mp)
5715 goto nla_put_failure;
5716
1cf844c7 5717 if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common,
597aa16c
XL		 5718 rt->fib6_nh->fib_nh_weight, AF_INET6,
5719 0) < 0)
beb1afac
DA		 5720 goto nla_put_failure;
5721
5722 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25 5723 &rt->fib6_siblings, fib6_siblings) {
1cf844c7 5724 if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common,
7bdf4de1 5725 sibling->fib6_nh->fib_nh_weight,
597aa16c 5726 AF_INET6, 0) < 0)
beb1afac
DA		 5727 goto nla_put_failure;
5728 }
5729
5730 nla_nest_end(skb, mp);
f88d8ea6
DA		 5731 } else if (rt->nh) {
5732 if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id))
5733 goto nla_put_failure;
ecc5663c 5734
f88d8ea6
DA		 5735 if (nexthop_is_blackhole(rt->nh))
5736 rtm->rtm_type = RTN_BLACKHOLE;
5737
bdf00bf2 5738 if (READ_ONCE(net->ipv4.sysctl_nexthop_compat_mode) &&
4f80116d 5739 rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
f88d8ea6
DA		 5740 goto nla_put_failure;
5741
5742 rtm->rtm_flags |= nh_flags;
5743 } else {
7bdf4de1 5744 if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6,
ecc5663c 5745 &nh_flags, false) < 0)
beb1afac 5746 goto nla_put_failure;
ecc5663c
DA		 5747
5748 rtm->rtm_flags |= nh_flags;
beb1afac
DA		 5749 }
5750
22d0bd82 5751 if (rt6_flags & RTF_EXPIRES) {
14895687
DA		 5752 expires = dst ? dst->expires : rt->expires;
5753 expires -= jiffies;
5754 }
69cdf8f9 5755
bb3c4ab9 5756 if (!dst) {
d95d6320 5757 if (READ_ONCE(rt->offload))
bb3c4ab9 5758 rtm->rtm_flags |= RTM_F_OFFLOAD;
d95d6320 5759 if (READ_ONCE(rt->trap))
bb3c4ab9 5760 rtm->rtm_flags |= RTM_F_TRAP;
d95d6320 5761 if (READ_ONCE(rt->offload_failed))
0c5fcf9e 5762 rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED;
bb3c4ab9
IS		 5763 }
5764
d4ead6b3 5765 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
e3703b3d 5766 goto nla_put_failure;
2d7202bf 5767
22d0bd82 5768 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
c78ba6d6
LR		 5769 goto nla_put_failure;
5770
19e42e45 5771
053c095a
JB		 5772 nlmsg_end(skb, nlh);
5773 return 0;
2d7202bf
TG		 5774
5775nla_put_failure:
26932566
PM		 5776 nlmsg_cancel(skb, nlh);
5777 return -EMSGSIZE;
1da177e4
LT		 5778}
5779
2c170e07
DA		 5780static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
5781{
5782 const struct net_device *dev = arg;
5783
5784 if (nh->fib_nh_dev == dev)
5785 return 1;
5786
5787 return 0;
5788}
5789
13e38901
DA		 5790static bool fib6_info_uses_dev(const struct fib6_info *f6i,
5791 const struct net_device *dev)
5792{
2c170e07
DA		 5793 if (f6i->nh) {
5794 struct net_device *_dev = (struct net_device *)dev;
5795
5796 return !!nexthop_for_each_fib6_nh(f6i->nh,
5797 fib6_info_nh_uses_dev,
5798 _dev);
5799 }
5800
1cf844c7 5801 if (f6i->fib6_nh->fib_nh_dev == dev)
13e38901
DA		 5802 return true;
5803
5804 if (f6i->fib6_nsiblings) {
5805 struct fib6_info *sibling, *next_sibling;
5806
5807 list_for_each_entry_safe(sibling, next_sibling,
5808 &f6i->fib6_siblings, fib6_siblings) {
1cf844c7 5809 if (sibling->fib6_nh->fib_nh_dev == dev)
13e38901
DA		 5810 return true;
5811 }
5812 }
5813
5814 return false;
5815}
5816
1e47b483
SB		 5817struct fib6_nh_exception_dump_walker {
5818 struct rt6_rtnl_dump_arg *dump;
5819 struct fib6_info *rt;
5820 unsigned int flags;
5821 unsigned int skip;
5822 unsigned int count;
5823};
5824
5825static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
5826{
5827 struct fib6_nh_exception_dump_walker *w = arg;
5828 struct rt6_rtnl_dump_arg *dump = w->dump;
5829 struct rt6_exception_bucket *bucket;
5830 struct rt6_exception *rt6_ex;
5831 int i, err;
5832
5833 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
5834 if (!bucket)
5835 return 0;
5836
5837 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
5838 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
5839 if (w->skip) {
5840 w->skip--;
5841 continue;
5842 }
5843
5844 /* Expiration of entries doesn't bump sernum, insertion
5845 * does. Removal is triggered by insertion, so we can
5846 * rely on the fact that if entries change between two
5847 * partial dumps, this node is scanned again completely,
5848 * see rt6_insert_exception() and fib6_dump_table().
5849 *
5850 * Count expired entries we go through as handled
5851 * entries that we'll skip next time, in case of partial
5852 * node dump. Otherwise, if entries expire meanwhile,
5853 * we'll skip the wrong amount.
5854 */
5855 if (rt6_check_expired(rt6_ex->rt6i)) {
5856 w->count++;
5857 continue;
5858 }
5859
5860 err = rt6_fill_node(dump->net, dump->skb, w->rt,
5861 &rt6_ex->rt6i->dst, NULL, NULL, 0,
5862 RTM_NEWROUTE,
5863 NETLINK_CB(dump->cb->skb).portid,
5864 dump->cb->nlh->nlmsg_seq, w->flags);
5865 if (err)
5866 return err;
5867
5868 w->count++;
5869 }
5870 bucket++;
5871 }
5872
5873 return 0;
5874}
5875
bf9a8a06 5876/* Return -1 if done with node, number of handled routes on partial dump */
1e47b483 5877int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
1da177e4
LT		 5878{
5879 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
13e38901
DA		 5880 struct fib_dump_filter *filter = &arg->filter;
5881 unsigned int flags = NLM_F_MULTI;
1f17e2f2 5882 struct net *net = arg->net;
1e47b483 5883 int count = 0;
1f17e2f2 5884
421842ed 5885 if (rt == net->ipv6.fib6_null_entry)
bf9a8a06 5886 return -1;
1da177e4 5887
13e38901
DA		 5888 if ((filter->flags & RTM_F_PREFIX) &&
5889 !(rt->fib6_flags & RTF_PREFIX_RT)) {
5890 /* success since this is not a prefix route */
bf9a8a06 5891 return -1;
13e38901 5892 }
1e47b483
SB		 5893 if (filter->filter_set &&
5894 ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
5895 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
5896 (filter->protocol && rt->fib6_protocol != filter->protocol))) {
5897 return -1;
5898 }
5899
5900 if (filter->filter_set ||
5901 !filter->dump_routes || !filter->dump_exceptions) {
13e38901 5902 flags |= NLM_F_DUMP_FILTERED;
f8cfe2ce 5903 }
1da177e4 5904
1e47b483
SB		 5905 if (filter->dump_routes) {
5906 if (skip) {
5907 skip--;
5908 } else {
5909 if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
5910 0, RTM_NEWROUTE,
5911 NETLINK_CB(arg->cb->skb).portid,
5912 arg->cb->nlh->nlmsg_seq, flags)) {
5913 return 0;
5914 }
5915 count++;
5916 }
5917 }
5918
5919 if (filter->dump_exceptions) {
5920 struct fib6_nh_exception_dump_walker w = { .dump = arg,
5921 .rt = rt,
5922 .flags = flags,
5923 .skip = skip,
5924 .count = 0 };
5925 int err;
5926
3b525691 5927 rcu_read_lock();
1e47b483
SB		 5928 if (rt->nh) {
5929 err = nexthop_for_each_fib6_nh(rt->nh,
5930 rt6_nh_dump_exceptions,
5931 &w);
5932 } else {
5933 err = rt6_nh_dump_exceptions(rt->fib6_nh, &w);
5934 }
3b525691 5935 rcu_read_unlock();
1e47b483
SB		 5936
5937 if (err)
74fd304f 5938 return count + w.count;
1e47b483 5939 }
bf9a8a06
SB		 5940
5941 return -1;
1da177e4
LT		 5942}
5943
0eff0a27
JK		 5944static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
5945 const struct nlmsghdr *nlh,
5946 struct nlattr **tb,
5947 struct netlink_ext_ack *extack)
5948{
5949 struct rtmsg *rtm;
5950 int i, err;
5951
5952 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
5953 NL_SET_ERR_MSG_MOD(extack,
5954 "Invalid header for get route request");
5955 return -EINVAL;
5956 }
5957
5958 if (!netlink_strict_get_check(skb))
8cb08174
JB		 5959 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5960 rtm_ipv6_policy, extack);
0eff0a27
JK		 5961
5962 rtm = nlmsg_data(nlh);
5963 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
5964 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
5965 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
5966 rtm->rtm_type) {
5967 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
5968 return -EINVAL;
5969 }
5970 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
5971 NL_SET_ERR_MSG_MOD(extack,
5972 "Invalid flags for get route request");
5973 return -EINVAL;
5974 }
5975
8cb08174
JB		 5976 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
5977 rtm_ipv6_policy, extack);
0eff0a27
JK		 5978 if (err)
5979 return err;
5980
5981 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
5982 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
5983 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
5984 return -EINVAL;
5985 }
5986
5987 for (i = 0; i <= RTA_MAX; i++) {
5988 if (!tb[i])
5989 continue;
5990
5991 switch (i) {
5992 case RTA_SRC:
5993 case RTA_DST:
5994 case RTA_IIF:
5995 case RTA_OIF:
5996 case RTA_MARK:
5997 case RTA_UID:
5998 case RTA_SPORT:
5999 case RTA_DPORT:
6000 case RTA_IP_PROTO:
6001 break;
6002 default:
6003 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
6004 return -EINVAL;
6005 }
6006 }
6007
6008 return 0;
6009}
6010
c21ef3e3
DA		 6011static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
6012 struct netlink_ext_ack *extack)
1da177e4 6013{
3b1e0a65 6014 struct net *net = sock_net(in_skb->sk);
ab364a6f 6015 struct nlattr *tb[RTA_MAX+1];
18c3a61c 6016 int err, iif = 0, oif = 0;
a68886a6 6017 struct fib6_info *from;
18c3a61c 6018 struct dst_entry *dst;
ab364a6f 6019 struct rt6_info *rt;
1da177e4 6020 struct sk_buff *skb;
ab364a6f 6021 struct rtmsg *rtm;
744486d4 6022 struct flowi6 fl6 = {};
18c3a61c 6023 bool fibmatch;
1da177e4 6024
0eff0a27 6025 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
ab364a6f
TG		 6026 if (err < 0)
6027 goto errout;
1da177e4 6028
ab364a6f 6029 err = -EINVAL;
38b7097b
HFS		 6030 rtm = nlmsg_data(nlh);
6031 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
18c3a61c 6032 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
1da177e4 6033
ab364a6f
TG		 6034 if (tb[RTA_SRC]) {
6035 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
6036 goto errout;
6037
4e3fd7a0 6038 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 6039 }
6040
6041 if (tb[RTA_DST]) {
6042 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
6043 goto errout;
6044
4e3fd7a0 6045 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 6046 }
6047
6048 if (tb[RTA_IIF])
6049 iif = nla_get_u32(tb[RTA_IIF]);
6050
6051 if (tb[RTA_OIF])
72331bc0 6052 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 6053
2e47b291
LC		 6054 if (tb[RTA_MARK])
6055 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
6056
622ec2c9
LC		 6057 if (tb[RTA_UID])
6058 fl6.flowi6_uid = make_kuid(current_user_ns(),
6059 nla_get_u32(tb[RTA_UID]));
6060 else
6061 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
6062
eacb9384
RP		 6063 if (tb[RTA_SPORT])
6064 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
6065
6066 if (tb[RTA_DPORT])
6067 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
6068
6069 if (tb[RTA_IP_PROTO]) {
6070 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
5e1a99ea
HL		 6071 &fl6.flowi6_proto, AF_INET6,
6072 extack);
eacb9384
RP		 6073 if (err)
6074 goto errout;
6075 }
6076
1da177e4
LT		 6077 if (iif) {
6078 struct net_device *dev;
72331bc0
SL		 6079 int flags = 0;
6080
121622db
FW		 6081 rcu_read_lock();
6082
6083 dev = dev_get_by_index_rcu(net, iif);
1da177e4 6084 if (!dev) {
121622db 6085 rcu_read_unlock();
1da177e4 6086 err = -ENODEV;
ab364a6f 6087 goto errout;
1da177e4 6088 }
72331bc0
SL		 6089
6090 fl6.flowi6_iif = iif;
6091
6092 if (!ipv6_addr_any(&fl6.saddr))
6093 flags |= RT6_LOOKUP_F_HAS_SADDR;
6094
b75cc8f9 6095 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
121622db
FW		 6096
6097 rcu_read_unlock();
72331bc0
SL		 6098 } else {
6099 fl6.flowi6_oif = oif;
6100
58acfd71 6101 dst = ip6_route_output(net, NULL, &fl6);
18c3a61c
RP		 6102 }
6103
18c3a61c
RP		 6104
6105 rt = container_of(dst, struct rt6_info, dst);
6106 if (rt->dst.error) {
6107 err = rt->dst.error;
6108 ip6_rt_put(rt);
6109 goto errout;
1da177e4
LT		 6110 }
6111
9d6acb3b
WC		 6112 if (rt == net->ipv6.ip6_null_entry) {
6113 err = rt->dst.error;
6114 ip6_rt_put(rt);
6115 goto errout;
6116 }
6117
ab364a6f 6118 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 6119 if (!skb) {
94e187c0 6120 ip6_rt_put(rt);
ab364a6f
TG		 6121 err = -ENOBUFS;
6122 goto errout;
6123 }
1da177e4 6124
d8d1f30b 6125 skb_dst_set(skb, &rt->dst);
a68886a6
DA		 6126
6127 rcu_read_lock();
6128 from = rcu_dereference(rt->from);
886b7a50
MKL		 6129 if (from) {
6130 if (fibmatch)
6131 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
6132 iif, RTM_NEWROUTE,
6133 NETLINK_CB(in_skb).portid,
6134 nlh->nlmsg_seq, 0);
6135 else
6136 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
6137 &fl6.saddr, iif, RTM_NEWROUTE,
6138 NETLINK_CB(in_skb).portid,
6139 nlh->nlmsg_seq, 0);
6140 } else {
6141 err = -ENETUNREACH;
6142 }
a68886a6
DA		 6143 rcu_read_unlock();
6144
1da177e4 6145 if (err < 0) {
ab364a6f
TG		 6146 kfree_skb(skb);
6147 goto errout;
1da177e4
LT		 6148 }
6149
15e47304 6150 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 6151errout:
1da177e4 6152 return err;
1da177e4
LT		 6153}
6154
8d1c802b 6155void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
37a1d361 6156 unsigned int nlm_flags)
1da177e4
LT		 6157{
6158 struct sk_buff *skb;
5578689a 6159 struct net *net = info->nl_net;
528c4ceb
DL		 6160 u32 seq;
6161 int err;
6162
6163 err = -ENOBUFS;
38308473 6164 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 6165
19e42e45 6166 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 6167 if (!skb)
21713ebc
TG		 6168 goto errout;
6169
d4ead6b3
DA		 6170 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6171 event, info->portid, seq, nlm_flags);
26932566
PM		 6172 if (err < 0) {
6173 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6174 WARN_ON(err == -EMSGSIZE);
6175 kfree_skb(skb);
6176 goto errout;
6177 }
15e47304 6178 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 6179 info->nlh, gfp_any());
6180 return;
21713ebc
TG		 6181errout:
6182 if (err < 0)
5578689a 6183 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 6184}
6185
19a3b7ee
DA		 6186void fib6_rt_update(struct net *net, struct fib6_info *rt,
6187 struct nl_info *info)
6188{
6189 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6190 struct sk_buff *skb;
6191 int err = -ENOBUFS;
6192
19a3b7ee
DA		 6193 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6194 if (!skb)
6195 goto errout;
6196
6197 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6198 RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
6199 if (err < 0) {
6200 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6201 WARN_ON(err == -EMSGSIZE);
6202 kfree_skb(skb);
6203 goto errout;
6204 }
6205 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6206 info->nlh, gfp_any());
6207 return;
6208errout:
6209 if (err < 0)
6210 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6211}
6212
907eea48 6213void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
0c5fcf9e 6214 bool offload, bool trap, bool offload_failed)
907eea48
AC		 6215{
6216 struct sk_buff *skb;
6217 int err;
6218
d95d6320
ED		 6219 if (READ_ONCE(f6i->offload) == offload &&
6220 READ_ONCE(f6i->trap) == trap &&
6221 READ_ONCE(f6i->offload_failed) == offload_failed)
907eea48
AC		 6222 return;
6223
d95d6320
ED		 6224 WRITE_ONCE(f6i->offload, offload);
6225 WRITE_ONCE(f6i->trap, trap);
6fad361a
AC		 6226
6227 /* 2 means send notifications only if offload_failed was changed. */
6228 if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 &&
d95d6320 6229 READ_ONCE(f6i->offload_failed) == offload_failed)
6fad361a
AC		 6230 return;
6231
d95d6320 6232 WRITE_ONCE(f6i->offload_failed, offload_failed);
907eea48
AC		 6233
6234 if (!rcu_access_pointer(f6i->fib6_node))
6235 /* The route was removed from the tree, do not send
89e8347f 6236 * notification.
907eea48
AC		 6237 */
6238 return;
6239
6240 if (!net->ipv6.sysctl.fib_notify_on_flag_change)
6241 return;
6242
6243 skb = nlmsg_new(rt6_nlmsg_size(f6i), GFP_KERNEL);
6244 if (!skb) {
6245 err = -ENOBUFS;
6246 goto errout;
6247 }
6248
6249 err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0,
6250 0, 0);
6251 if (err < 0) {
6252 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6253 WARN_ON(err == -EMSGSIZE);
6254 kfree_skb(skb);
6255 goto errout;
6256 }
6257
6258 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_ROUTE, NULL, GFP_KERNEL);
6259 return;
6260
6261errout:
6262 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6263}
6264EXPORT_SYMBOL(fib6_info_hw_flags_set);
6265
8ed67789 6266static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 6267 unsigned long event, void *ptr)
8ed67789 6268{
351638e7 6269 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 6270 struct net *net = dev_net(dev);
8ed67789 6271
242d3a49
WC		 6272 if (!(dev->flags & IFF_LOOPBACK))
6273 return NOTIFY_OK;
6274
6275 if (event == NETDEV_REGISTER) {
1cf844c7 6276 net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev;
d8d1f30b 6277 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 6278 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
6279#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 6280 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 6281 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 6282 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789 6283 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
242d3a49 6284#endif
76da0704
WC		 6285 } else if (event == NETDEV_UNREGISTER &&
6286 dev->reg_state != NETREG_UNREGISTERED) {
6287 /* NETDEV_UNREGISTER could be fired for multiple times by
6288 * netdev_wait_allrefs(). Make sure we only call this once.
6289 */
12d94a80 6290 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
242d3a49 6291#ifdef CONFIG_IPV6_MULTIPLE_TABLES
12d94a80
ED		 6292 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
6293 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
8ed67789
DL		 6294#endif
6295 }
6296
6297 return NOTIFY_OK;
6298}
6299
1da177e4
LT		 6300/*
6301 * /proc
6302 */
6303
6304#ifdef CONFIG_PROC_FS
1da177e4
LT		 6305static int rt6_stats_seq_show(struct seq_file *seq, void *v)
6306{
69ddb805 6307 struct net *net = (struct net *)seq->private;
1da177e4 6308 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 6309 net->ipv6.rt6_stats->fib_nodes,
6310 net->ipv6.rt6_stats->fib_route_nodes,
81eb8447 6311 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
69ddb805
DL		 6312 net->ipv6.rt6_stats->fib_rt_entries,
6313 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 6314 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 6315 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 6316
6317 return 0;
6318}
1da177e4
LT		 6319#endif /* CONFIG_PROC_FS */
6320
6321#ifdef CONFIG_SYSCTL
6322
32927393
CH		 6323static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
6324 void *buffer, size_t *lenp, loff_t *ppos)
1da177e4 6325{
c486da34
LAG		 6326 struct net *net;
6327 int delay;
f0fb9b28 6328 int ret;
c486da34 6329 if (!write)
1da177e4 6330 return -EINVAL;
c486da34
LAG		 6331
6332 net = (struct net *)ctl->extra1;
6333 delay = net->ipv6.sysctl.flush_delay;
f0fb9b28
AP		 6334 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6335 if (ret)
6336 return ret;
6337
2ac3ac8f 6338 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 6339 return 0;
1da177e4
LT		 6340}
6341
ed792e28 6342static struct ctl_table ipv6_route_table_template[] = {
1ab1457c 6343 {
06e6c88f
AK		 6344 .procname = "max_size",
6345 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4 6346 .maxlen = sizeof(int),
06e6c88f
AK		 6347 .mode = 0644,
6348 .proc_handler = proc_dointvec,
1da177e4
LT		 6349 },
6350 {
1da177e4 6351 .procname = "gc_thresh",
9a7ec3a9 6352 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 6353 .maxlen = sizeof(int),
6354 .mode = 0644,
6d9f239a 6355 .proc_handler = proc_dointvec,
1da177e4
LT		 6356 },
6357 {
06e6c88f
AK		 6358 .procname = "flush",
6359 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 6360 .maxlen = sizeof(int),
06e6c88f
AK		 6361 .mode = 0200,
6362 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 6363 },
6364 {
1da177e4 6365 .procname = "gc_min_interval",
4990509f 6366 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 6367 .maxlen = sizeof(int),
6368 .mode = 0644,
6d9f239a 6369 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6370 },
6371 {
1da177e4 6372 .procname = "gc_timeout",
4990509f 6373 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 6374 .maxlen = sizeof(int),
6375 .mode = 0644,
6d9f239a 6376 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6377 },
6378 {
1da177e4 6379 .procname = "gc_interval",
4990509f 6380 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 6381 .maxlen = sizeof(int),
6382 .mode = 0644,
6d9f239a 6383 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6384 },
6385 {
1da177e4 6386 .procname = "gc_elasticity",
4990509f 6387 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 6388 .maxlen = sizeof(int),
6389 .mode = 0644,
f3d3f616 6390 .proc_handler = proc_dointvec,
1da177e4
LT		 6391 },
6392 {
1da177e4 6393 .procname = "mtu_expires",
4990509f 6394 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 6395 .maxlen = sizeof(int),
6396 .mode = 0644,
6d9f239a 6397 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6398 },
6399 {
1da177e4 6400 .procname = "min_adv_mss",
4990509f 6401 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 6402 .maxlen = sizeof(int),
6403 .mode = 0644,
f3d3f616 6404 .proc_handler = proc_dointvec,
1da177e4
LT		 6405 },
6406 {
1da177e4 6407 .procname = "gc_min_interval_ms",
4990509f 6408 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 6409 .maxlen = sizeof(int),
6410 .mode = 0644,
6d9f239a 6411 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 6412 },
7c6bb7d2
DA		 6413 {
6414 .procname = "skip_notify_on_dev_down",
6415 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
6416 .maxlen = sizeof(int),
6417 .mode = 0644,
b8e8a863 6418 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 6419 .extra1 = SYSCTL_ZERO,
6420 .extra2 = SYSCTL_ONE,
7c6bb7d2 6421 },
f8572d8f 6422 { }
1da177e4
LT		 6423};
6424
2c8c1e72 6425struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 6426{
6427 struct ctl_table *table;
6428
6429 table = kmemdup(ipv6_route_table_template,
6430 sizeof(ipv6_route_table_template),
6431 GFP_KERNEL);
5ee09105
YH		 6432
6433 if (table) {
06e6c88f 6434 table[0].data = &net->ipv6.sysctl.ip6_rt_max_size;
86393e52 6435 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
06e6c88f
AK		 6436 table[2].data = &net->ipv6.sysctl.flush_delay;
6437 table[2].extra1 = net;
5ee09105
YH		 6438 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6439 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
6440 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
6441 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
6442 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
6443 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 6444 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
7c6bb7d2 6445 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
464dc801
EB		 6446
6447 /* Don't export sysctls to unprivileged users */
6448 if (net->user_ns != &init_user_ns)
06e6c88f 6449 table[1].procname = NULL;
5ee09105
YH		 6450 }
6451
760f2d01
DL		 6452 return table;
6453}
1da177e4
LT		 6454#endif
6455
2c8c1e72 6456static int __net_init ip6_route_net_init(struct net *net)
cdb18761 6457{
633d424b 6458 int ret = -ENOMEM;
8ed67789 6459
86393e52
AD		 6460 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
6461 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 6462
fc66f95c
ED		 6463 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
6464 goto out_ip6_dst_ops;
6465
1cf844c7 6466 net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true);
421842ed
DA		 6467 if (!net->ipv6.fib6_null_entry)
6468 goto out_ip6_dst_entries;
1cf844c7
DA		 6469 memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template,
6470 sizeof(*net->ipv6.fib6_null_entry));
421842ed 6471
8ed67789
DL		 6472 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
6473 sizeof(*net->ipv6.ip6_null_entry),
6474 GFP_KERNEL);
6475 if (!net->ipv6.ip6_null_entry)
421842ed 6476 goto out_fib6_null_entry;
d8d1f30b 6477 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6478 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
6479 ip6_template_metrics, true);
74109218 6480 INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached);
8ed67789
DL		 6481
6482#ifdef CONFIG_IPV6_MULTIPLE_TABLES
feca7d8c 6483 net->ipv6.fib6_has_custom_rules = false;
8ed67789
DL		 6484 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
6485 sizeof(*net->ipv6.ip6_prohibit_entry),
6486 GFP_KERNEL);
68fffc67
PZ		 6487 if (!net->ipv6.ip6_prohibit_entry)
6488 goto out_ip6_null_entry;
d8d1f30b 6489 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6490 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
6491 ip6_template_metrics, true);
74109218 6492 INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached);
8ed67789
DL		 6493
6494 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
6495 sizeof(*net->ipv6.ip6_blk_hole_entry),
6496 GFP_KERNEL);
68fffc67
PZ		 6497 if (!net->ipv6.ip6_blk_hole_entry)
6498 goto out_ip6_prohibit_entry;
d8d1f30b 6499 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6500 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
6501 ip6_template_metrics, true);
74109218 6502 INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
b9b33e7c
PA		 6503#ifdef CONFIG_IPV6_SUBTREES
6504 net->ipv6.fib6_routes_require_src = 0;
6505#endif
8ed67789
DL		 6506#endif
6507
b339a47c 6508 net->ipv6.sysctl.flush_delay = 0;
af6d1034 6509 net->ipv6.sysctl.ip6_rt_max_size = INT_MAX;
b339a47c
PZ		 6510 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
6511 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
6512 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
6513 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
6514 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
6515 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
7c6bb7d2 6516 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
b339a47c 6517
9cb7c013 6518 atomic_set(&net->ipv6.ip6_rt_gc_expire, 30*HZ);
6891a346 6519
8ed67789
DL		 6520 ret = 0;
6521out:
6522 return ret;
f2fc6a54 6523
68fffc67
PZ		 6524#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6525out_ip6_prohibit_entry:
6526 kfree(net->ipv6.ip6_prohibit_entry);
6527out_ip6_null_entry:
6528 kfree(net->ipv6.ip6_null_entry);
6529#endif
421842ed
DA		 6530out_fib6_null_entry:
6531 kfree(net->ipv6.fib6_null_entry);
fc66f95c
ED		 6532out_ip6_dst_entries:
6533 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 6534out_ip6_dst_ops:
f2fc6a54 6535 goto out;
cdb18761
DL		 6536}
6537
2c8c1e72 6538static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 6539{
421842ed 6540 kfree(net->ipv6.fib6_null_entry);
8ed67789
DL		 6541 kfree(net->ipv6.ip6_null_entry);
6542#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6543 kfree(net->ipv6.ip6_prohibit_entry);
6544 kfree(net->ipv6.ip6_blk_hole_entry);
6545#endif
41bb78b4 6546 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 6547}
6548
d189634e
TG		 6549static int __net_init ip6_route_net_init_late(struct net *net)
6550{
6551#ifdef CONFIG_PROC_FS
768b3c74
ZS		 6552 if (!proc_create_net("ipv6_route", 0, net->proc_net,
6553 &ipv6_route_seq_ops,
6554 sizeof(struct ipv6_route_iter)))
6555 return -ENOMEM;
6556
6557 if (!proc_create_net_single("rt6_stats", 0444, net->proc_net,
6558 rt6_stats_seq_show, NULL)) {
6559 remove_proc_entry("ipv6_route", net->proc_net);
6560 return -ENOMEM;
6561 }
d189634e
TG		 6562#endif
6563 return 0;
6564}
6565
6566static void __net_exit ip6_route_net_exit_late(struct net *net)
6567{
6568#ifdef CONFIG_PROC_FS
ece31ffd
G		 6569 remove_proc_entry("ipv6_route", net->proc_net);
6570 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 6571#endif
6572}
6573
cdb18761
DL		 6574static struct pernet_operations ip6_route_net_ops = {
6575 .init = ip6_route_net_init,
6576 .exit = ip6_route_net_exit,
6577};
6578
c3426b47
DM		 6579static int __net_init ipv6_inetpeer_init(struct net *net)
6580{
6581 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
6582
6583 if (!bp)
6584 return -ENOMEM;
6585 inet_peer_base_init(bp);
6586 net->ipv6.peers = bp;
6587 return 0;
6588}
6589
6590static void __net_exit ipv6_inetpeer_exit(struct net *net)
6591{
6592 struct inet_peer_base *bp = net->ipv6.peers;
6593
6594 net->ipv6.peers = NULL;
56a6b248 6595 inetpeer_invalidate_tree(bp);
c3426b47
DM		 6596 kfree(bp);
6597}
6598
2b823f72 6599static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 6600 .init = ipv6_inetpeer_init,
6601 .exit = ipv6_inetpeer_exit,
6602};
6603
d189634e
TG		 6604static struct pernet_operations ip6_route_net_late_ops = {
6605 .init = ip6_route_net_init_late,
6606 .exit = ip6_route_net_exit_late,
6607};
6608
8ed67789
DL		 6609static struct notifier_block ip6_route_dev_notifier = {
6610 .notifier_call = ip6_route_dev_notify,
242d3a49 6611 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
8ed67789
DL		 6612};
6613
2f460933
WC		 6614void __init ip6_route_init_special_entries(void)
6615{
6616 /* Registering of the loopback is done before this portion of code,
6617 * the loopback reference in rt6_info will not be taken, do it
6618 * manually for init_net */
1cf844c7 6619 init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev;
2f460933
WC		 6620 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
6621 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6622 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6623 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
6624 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6625 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
6626 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6627 #endif
6628}
6629
138d0be3
YS		 6630#if IS_BUILTIN(CONFIG_IPV6)
6631#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6632DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
6633
951cf368
YS		 6634BTF_ID_LIST(btf_fib6_info_id)
6635BTF_ID(struct, fib6_info)
6636
14fc6bd6 6637static const struct bpf_iter_seq_info ipv6_route_seq_info = {
15172a46
YS		 6638 .seq_ops = &ipv6_route_seq_ops,
6639 .init_seq_private = bpf_iter_init_seq_net,
6640 .fini_seq_private = bpf_iter_fini_seq_net,
6641 .seq_priv_size = sizeof(struct ipv6_route_iter),
14fc6bd6
YS		 6642};
6643
6644static struct bpf_iter_reg ipv6_route_reg_info = {
6645 .target = "ipv6_route",
3c32cc1b
YS		 6646 .ctx_arg_info_size = 1,
6647 .ctx_arg_info = {
6648 { offsetof(struct bpf_iter__ipv6_route, rt),
6649 PTR_TO_BTF_ID_OR_NULL },
6650 },
14fc6bd6 6651 .seq_info = &ipv6_route_seq_info,
15172a46
YS		 6652};
6653
138d0be3
YS		 6654static int __init bpf_iter_register(void)
6655{
951cf368 6656 ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;
15172a46 6657 return bpf_iter_reg_target(&ipv6_route_reg_info);
138d0be3
YS		 6658}
6659
6660static void bpf_iter_unregister(void)
6661{
ab2ee4fc 6662 bpf_iter_unreg_target(&ipv6_route_reg_info);
138d0be3
YS		 6663}
6664#endif
6665#endif
6666
433d49c3 6667int __init ip6_route_init(void)
1da177e4 6668{
433d49c3 6669 int ret;
8d0b94af 6670 int cpu;
433d49c3 6671
9a7ec3a9
DL		 6672 ret = -ENOMEM;
6673 ip6_dst_ops_template.kmem_cachep =
e5d679f3 6674 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
6126891c 6675 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, NULL);
9a7ec3a9 6676 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 6677 goto out;
14e50e57 6678
fc66f95c 6679 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 6680 if (ret)
bdb3289f 6681 goto out_kmem_cache;
bdb3289f 6682
c3426b47
DM		 6683 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
6684 if (ret)
e8803b6c 6685 goto out_dst_entries;
2a0c451a 6686
7e52b33b
DM		 6687 ret = register_pernet_subsys(&ip6_route_net_ops);
6688 if (ret)
6689 goto out_register_inetpeer;
c3426b47 6690
5dc121e9
AE		 6691 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
6692
e8803b6c 6693 ret = fib6_init();
433d49c3 6694 if (ret)
8ed67789 6695 goto out_register_subsys;
433d49c3 6696
433d49c3
DL		 6697 ret = xfrm6_init();
6698 if (ret)
e8803b6c 6699 goto out_fib6_init;
c35b7e72 6700
433d49c3
DL		 6701 ret = fib6_rules_init();
6702 if (ret)
6703 goto xfrm6_init;
7e5449c2 6704
d189634e
TG		 6705 ret = register_pernet_subsys(&ip6_route_net_late_ops);
6706 if (ret)
6707 goto fib6_rules_init;
6708
16feebcf
FW		 6709 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
6710 inet6_rtm_newroute, NULL, 0);
6711 if (ret < 0)
6712 goto out_register_late_subsys;
6713
6714 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
6715 inet6_rtm_delroute, NULL, 0);
6716 if (ret < 0)
6717 goto out_register_late_subsys;
6718
6719 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
6720 inet6_rtm_getroute, NULL,
6721 RTNL_FLAG_DOIT_UNLOCKED);
6722 if (ret < 0)
d189634e 6723 goto out_register_late_subsys;
c127ea2c 6724
8ed67789 6725 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 6726 if (ret)
d189634e 6727 goto out_register_late_subsys;
8ed67789 6728
138d0be3
YS		 6729#if IS_BUILTIN(CONFIG_IPV6)
6730#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6731 ret = bpf_iter_register();
6732 if (ret)
6733 goto out_register_late_subsys;
6734#endif
6735#endif
6736
8d0b94af
MKL		 6737 for_each_possible_cpu(cpu) {
6738 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
6739
6740 INIT_LIST_HEAD(&ul->head);
ba55ef81 6741 INIT_LIST_HEAD(&ul->quarantine);
8d0b94af
MKL		 6742 spin_lock_init(&ul->lock);
6743 }
6744
433d49c3
DL		 6745out:
6746 return ret;
6747
d189634e 6748out_register_late_subsys:
16feebcf 6749 rtnl_unregister_all(PF_INET6);
d189634e 6750 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 6751fib6_rules_init:
433d49c3
DL		 6752 fib6_rules_cleanup();
6753xfrm6_init:
433d49c3 6754 xfrm6_fini();
2a0c451a
TG		 6755out_fib6_init:
6756 fib6_gc_cleanup();
8ed67789
DL		 6757out_register_subsys:
6758 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 6759out_register_inetpeer:
6760 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 6761out_dst_entries:
6762 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 6763out_kmem_cache:
f2fc6a54 6764 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 6765 goto out;
1da177e4
LT		 6766}
6767
6768void ip6_route_cleanup(void)
6769{
138d0be3
YS		 6770#if IS_BUILTIN(CONFIG_IPV6)
6771#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6772 bpf_iter_unregister();
6773#endif
6774#endif
8ed67789 6775 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 6776 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 6777 fib6_rules_cleanup();
1da177e4 6778 xfrm6_fini();
1da177e4 6779 fib6_gc_cleanup();
c3426b47 6780 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 6781 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 6782 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 6783 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 6784}
Linux 6.x block layer and io_uring tree(s)