1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * IPv6 input |
4 | * Linux INET6 implementation |
5 | * |
6 | * Authors: |
7 | * Pedro Roque <roque@di.fc.ul.pt> |
8 | * Ian P. Morris <I.P.Morris@soton.ac.uk> |
9 | * |
10 | * Based in linux/net/ipv4/ip_input.c |
11 | */ |
12 | /* Changes |
13 | * |
14 | * Mitsuru KANDA @USAGI and |
15 | * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs(). |
16 | */ |
17 | |
18 | #include <linux/errno.h> |
19 | #include <linux/types.h> |
20 | #include <linux/socket.h> |
21 | #include <linux/sockios.h> |
22 | #include <linux/net.h> |
23 | #include <linux/netdevice.h> |
24 | #include <linux/in6.h> |
25 | #include <linux/icmpv6.h> |
26 | #include <linux/mroute6.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/indirect_call_wrapper.h> |
29 | |
30 | #include <linux/netfilter.h> |
31 | #include <linux/netfilter_ipv6.h> |
32 | |
33 | #include <net/sock.h> |
34 | #include <net/snmp.h> |
35 | #include <net/udp.h> |
36 | |
37 | #include <net/ipv6.h> |
38 | #include <net/protocol.h> |
39 | #include <net/transp_v6.h> |
40 | #include <net/rawv6.h> |
41 | #include <net/ndisc.h> |
42 | #include <net/ip6_route.h> |
43 | #include <net/addrconf.h> |
44 | #include <net/xfrm.h> |
45 | #include <net/inet_ecn.h> |
46 | #include <net/dst_metadata.h> |
47 | |
48 | static void ip6_rcv_finish_core(struct net *net, struct sock *sk, |
49 | struct sk_buff *skb) |
50 | { |
51 | if (READ_ONCE(net->ipv4.sysctl_ip_early_demux) && |
52 | !skb_dst(skb) && !skb->sk) { |
53 | switch (ipv6_hdr(skb)->nexthdr) { |
54 | case IPPROTO_TCP: |
55 | if (READ_ONCE(net->ipv4.sysctl_tcp_early_demux)) |
56 | tcp_v6_early_demux(skb); |
57 | break; |
58 | case IPPROTO_UDP: |
59 | if (READ_ONCE(net->ipv4.sysctl_udp_early_demux)) |
60 | udp_v6_early_demux(skb); |
61 | break; |
62 | } |
63 | } |
64 | |
65 | if (!skb_valid_dst(skb)) |
66 | ip6_route_input(skb); |
67 | } |
68 | |
69 | int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
70 | { |
71 | /* if ingress device is enslaved to an L3 master device pass the |
72 | * skb to its handler for processing |
73 | */ |
74 | skb = l3mdev_ip6_rcv(skb); |
75 | if (!skb) |
76 | return NET_RX_SUCCESS; |
77 | ip6_rcv_finish_core(net, sk, skb); |
78 | |
79 | return dst_input(skb); |
80 | } |
81 | |
82 | static void ip6_sublist_rcv_finish(struct list_head *head) |
83 | { |
84 | struct sk_buff *skb, *next; |
85 | |
86 | list_for_each_entry_safe(skb, next, head, list) { |
87 | skb_list_del_init(skb); |
88 | dst_input(skb); |
89 | } |
90 | } |
91 | |
92 | static bool ip6_can_use_hint(const struct sk_buff *skb, |
93 | const struct sk_buff *hint) |
94 | { |
95 | return hint && !skb_dst(skb) && |
96 | ipv6_addr_equal(a1: &ipv6_hdr(skb: hint)->daddr, a2: &ipv6_hdr(skb)->daddr); |
97 | } |
98 | |
99 | static struct sk_buff *(const struct net *net, |
100 | struct sk_buff *skb) |
101 | { |
102 | if (fib6_routes_require_src(net) || fib6_has_custom_rules(net) || |
103 | IP6CB(skb)->flags & IP6SKB_MULTIPATH) |
104 | return NULL; |
105 | |
106 | return skb; |
107 | } |
108 | |
109 | static void ip6_list_rcv_finish(struct net *net, struct sock *sk, |
110 | struct list_head *head) |
111 | { |
112 | struct sk_buff *skb, *next, *hint = NULL; |
113 | struct dst_entry *curr_dst = NULL; |
114 | struct list_head sublist; |
115 | |
116 | INIT_LIST_HEAD(list: &sublist); |
117 | list_for_each_entry_safe(skb, next, head, list) { |
118 | struct dst_entry *dst; |
119 | |
120 | skb_list_del_init(skb); |
121 | /* if ingress device is enslaved to an L3 master device pass the |
122 | * skb to its handler for processing |
123 | */ |
124 | skb = l3mdev_ip6_rcv(skb); |
125 | if (!skb) |
126 | continue; |
127 | |
128 | if (ip6_can_use_hint(skb, hint)) |
129 | skb_dst_copy(nskb: skb, oskb: hint); |
130 | else |
131 | ip6_rcv_finish_core(net, sk, skb); |
132 | dst = skb_dst(skb); |
133 | if (curr_dst != dst) { |
134 | hint = ip6_extract_route_hint(net, skb); |
135 | |
136 | /* dispatch old sublist */ |
137 | if (!list_empty(head: &sublist)) |
138 | ip6_sublist_rcv_finish(head: &sublist); |
139 | /* start new sublist */ |
140 | INIT_LIST_HEAD(list: &sublist); |
141 | curr_dst = dst; |
142 | } |
143 | list_add_tail(new: &skb->list, head: &sublist); |
144 | } |
145 | /* dispatch final sublist */ |
146 | ip6_sublist_rcv_finish(head: &sublist); |
147 | } |
148 | |
149 | static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev, |
150 | struct net *net) |
151 | { |
152 | enum skb_drop_reason reason; |
153 | const struct ipv6hdr *hdr; |
154 | u32 pkt_len; |
155 | struct inet6_dev *idev; |
156 | |
157 | if (skb->pkt_type == PACKET_OTHERHOST) { |
158 | dev_core_stats_rx_otherhost_dropped_inc(dev: skb->dev); |
159 | kfree_skb_reason(skb, reason: SKB_DROP_REASON_OTHERHOST); |
160 | return NULL; |
161 | } |
162 | |
163 | rcu_read_lock(); |
164 | |
165 | idev = __in6_dev_get(dev: skb->dev); |
166 | |
167 | __IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_IN, skb->len); |
168 | |
169 | SKB_DR_SET(reason, NOT_SPECIFIED); |
170 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL || |
171 | !idev || unlikely(idev->cnf.disable_ipv6)) { |
172 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
173 | if (idev && unlikely(idev->cnf.disable_ipv6)) |
174 | SKB_DR_SET(reason, IPV6DISABLED); |
175 | goto drop; |
176 | } |
177 | |
178 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
179 | |
180 | /* |
181 | * Store incoming device index. When the packet will |
182 | * be queued, we cannot refer to skb->dev anymore. |
183 | * |
184 | * BTW, when we send a packet for our own local address on a |
185 | * non-loopback interface (e.g. ethX), it is being delivered |
186 | * via the loopback interface (lo) here; skb->dev = loopback_dev. |
187 | * It, however, should be considered as if it is being |
188 | * arrived via the sending interface (ethX), because of the |
189 | * nature of scoping architecture. --yoshfuji |
190 | */ |
191 | IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(dst: skb_dst(skb))->dev->ifindex : dev->ifindex; |
192 | |
193 | if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) |
194 | goto err; |
195 | |
196 | hdr = ipv6_hdr(skb); |
197 | |
198 | if (hdr->version != 6) { |
199 | SKB_DR_SET(reason, UNHANDLED_PROTO); |
200 | goto err; |
201 | } |
202 | |
203 | __IP6_ADD_STATS(net, idev, |
204 | IPSTATS_MIB_NOECTPKTS + |
205 | (ipv6_get_dsfield(hdr) & INET_ECN_MASK), |
206 | max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs)); |
207 | /* |
208 | * RFC4291 2.5.3 |
209 | * The loopback address must not be used as the source address in IPv6 |
210 | * packets that are sent outside of a single node. [..] |
211 | * A packet received on an interface with a destination address |
212 | * of loopback must be dropped. |
213 | */ |
214 | if ((ipv6_addr_loopback(a: &hdr->saddr) || |
215 | ipv6_addr_loopback(a: &hdr->daddr)) && |
216 | !(dev->flags & IFF_LOOPBACK) && |
217 | !netif_is_l3_master(dev)) |
218 | goto err; |
219 | |
220 | /* RFC4291 Errata ID: 3480 |
221 | * Interface-Local scope spans only a single interface on a |
222 | * node and is useful only for loopback transmission of |
223 | * multicast. Packets with interface-local scope received |
224 | * from another node must be discarded. |
225 | */ |
226 | if (!(skb->pkt_type == PACKET_LOOPBACK || |
227 | dev->flags & IFF_LOOPBACK) && |
228 | ipv6_addr_is_multicast(addr: &hdr->daddr) && |
229 | IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1) |
230 | goto err; |
231 | |
232 | /* If enabled, drop unicast packets that were encapsulated in link-layer |
233 | * multicast or broadcast to protected against the so-called "hole-196" |
234 | * attack in 802.11 wireless. |
235 | */ |
236 | if (!ipv6_addr_is_multicast(addr: &hdr->daddr) && |
237 | (skb->pkt_type == PACKET_BROADCAST || |
238 | skb->pkt_type == PACKET_MULTICAST) && |
239 | idev->cnf.drop_unicast_in_l2_multicast) { |
240 | SKB_DR_SET(reason, UNICAST_IN_L2_MULTICAST); |
241 | goto err; |
242 | } |
243 | |
244 | /* RFC4291 2.7 |
245 | * Nodes must not originate a packet to a multicast address whose scope |
246 | * field contains the reserved value 0; if such a packet is received, it |
247 | * must be silently dropped. |
248 | */ |
249 | if (ipv6_addr_is_multicast(addr: &hdr->daddr) && |
250 | IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0) |
251 | goto err; |
252 | |
253 | /* |
254 | * RFC4291 2.7 |
255 | * Multicast addresses must not be used as source addresses in IPv6 |
256 | * packets or appear in any Routing header. |
257 | */ |
258 | if (ipv6_addr_is_multicast(addr: &hdr->saddr)) |
259 | goto err; |
260 | |
261 | skb->transport_header = skb->network_header + sizeof(*hdr); |
262 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
263 | |
264 | pkt_len = ntohs(hdr->payload_len); |
265 | |
266 | /* pkt_len may be zero if Jumbo payload option is present */ |
267 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
268 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
269 | __IP6_INC_STATS(net, |
270 | idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
271 | SKB_DR_SET(reason, PKT_TOO_SMALL); |
272 | goto drop; |
273 | } |
274 | if (pskb_trim_rcsum(skb, len: pkt_len + sizeof(struct ipv6hdr))) |
275 | goto err; |
276 | hdr = ipv6_hdr(skb); |
277 | } |
278 | |
279 | if (hdr->nexthdr == NEXTHDR_HOP) { |
280 | if (ipv6_parse_hopopts(skb) < 0) { |
281 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
282 | rcu_read_unlock(); |
283 | return NULL; |
284 | } |
285 | } |
286 | |
287 | rcu_read_unlock(); |
288 | |
289 | /* Must drop socket now because of tproxy. */ |
290 | if (!skb_sk_is_prefetched(skb)) |
291 | skb_orphan(skb); |
292 | |
293 | return skb; |
294 | err: |
295 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
296 | SKB_DR_OR(reason, IP_INHDR); |
297 | drop: |
298 | rcu_read_unlock(); |
299 | kfree_skb_reason(skb, reason); |
300 | return NULL; |
301 | } |
302 | |
303 | int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
304 | { |
305 | struct net *net = dev_net(dev: skb->dev); |
306 | |
307 | skb = ip6_rcv_core(skb, dev, net); |
308 | if (skb == NULL) |
309 | return NET_RX_DROP; |
310 | return NF_HOOK(pf: NFPROTO_IPV6, hook: NF_INET_PRE_ROUTING, |
311 | net, NULL, skb, in: dev, NULL, |
312 | okfn: ip6_rcv_finish); |
313 | } |
314 | |
315 | static void ip6_sublist_rcv(struct list_head *head, struct net_device *dev, |
316 | struct net *net) |
317 | { |
318 | NF_HOOK_LIST(pf: NFPROTO_IPV6, hook: NF_INET_PRE_ROUTING, net, NULL, |
319 | head, in: dev, NULL, okfn: ip6_rcv_finish); |
320 | ip6_list_rcv_finish(net, NULL, head); |
321 | } |
322 | |
323 | /* Receive a list of IPv6 packets */ |
324 | void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, |
325 | struct net_device *orig_dev) |
326 | { |
327 | struct net_device *curr_dev = NULL; |
328 | struct net *curr_net = NULL; |
329 | struct sk_buff *skb, *next; |
330 | struct list_head sublist; |
331 | |
332 | INIT_LIST_HEAD(list: &sublist); |
333 | list_for_each_entry_safe(skb, next, head, list) { |
334 | struct net_device *dev = skb->dev; |
335 | struct net *net = dev_net(dev); |
336 | |
337 | skb_list_del_init(skb); |
338 | skb = ip6_rcv_core(skb, dev, net); |
339 | if (skb == NULL) |
340 | continue; |
341 | |
342 | if (curr_dev != dev || curr_net != net) { |
343 | /* dispatch old sublist */ |
344 | if (!list_empty(head: &sublist)) |
345 | ip6_sublist_rcv(head: &sublist, dev: curr_dev, net: curr_net); |
346 | /* start new sublist */ |
347 | INIT_LIST_HEAD(list: &sublist); |
348 | curr_dev = dev; |
349 | curr_net = net; |
350 | } |
351 | list_add_tail(new: &skb->list, head: &sublist); |
352 | } |
353 | /* dispatch final sublist */ |
354 | if (!list_empty(head: &sublist)) |
355 | ip6_sublist_rcv(head: &sublist, dev: curr_dev, net: curr_net); |
356 | } |
357 | |
358 | INDIRECT_CALLABLE_DECLARE(int tcp_v6_rcv(struct sk_buff *)); |
359 | |
360 | /* |
361 | * Deliver the packet to the host |
362 | */ |
363 | void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, |
364 | bool have_final) |
365 | { |
366 | const struct inet6_protocol *ipprot; |
367 | struct inet6_dev *idev; |
368 | unsigned int nhoff; |
369 | SKB_DR(reason); |
370 | bool raw; |
371 | |
372 | /* |
373 | * Parse extension headers |
374 | */ |
375 | |
376 | resubmit: |
377 | idev = ip6_dst_idev(dst: skb_dst(skb)); |
378 | nhoff = IP6CB(skb)->nhoff; |
379 | if (!have_final) { |
380 | if (!pskb_pull(skb, len: skb_transport_offset(skb))) |
381 | goto discard; |
382 | nexthdr = skb_network_header(skb)[nhoff]; |
383 | } |
384 | |
385 | resubmit_final: |
386 | raw = raw6_local_deliver(skb, nexthdr); |
387 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
388 | if (ipprot) { |
389 | int ret; |
390 | |
391 | if (have_final) { |
392 | if (!(ipprot->flags & INET6_PROTO_FINAL)) { |
393 | /* Once we've seen a final protocol don't |
394 | * allow encapsulation on any non-final |
395 | * ones. This allows foo in UDP encapsulation |
396 | * to work. |
397 | */ |
398 | goto discard; |
399 | } |
400 | } else if (ipprot->flags & INET6_PROTO_FINAL) { |
401 | const struct ipv6hdr *hdr; |
402 | int sdif = inet6_sdif(skb); |
403 | struct net_device *dev; |
404 | |
405 | /* Only do this once for first final protocol */ |
406 | have_final = true; |
407 | |
408 | |
409 | skb_postpull_rcsum(skb, start: skb_network_header(skb), |
410 | len: skb_network_header_len(skb)); |
411 | hdr = ipv6_hdr(skb); |
412 | |
413 | /* skb->dev passed may be master dev for vrfs. */ |
414 | if (sdif) { |
415 | dev = dev_get_by_index_rcu(net, ifindex: sdif); |
416 | if (!dev) |
417 | goto discard; |
418 | } else { |
419 | dev = skb->dev; |
420 | } |
421 | |
422 | if (ipv6_addr_is_multicast(addr: &hdr->daddr) && |
423 | !ipv6_chk_mcast_addr(dev, group: &hdr->daddr, |
424 | src_addr: &hdr->saddr) && |
425 | !ipv6_is_mld(skb, nexthdr, offset: skb_network_header_len(skb))) { |
426 | SKB_DR_SET(reason, IP_INADDRERRORS); |
427 | goto discard; |
428 | } |
429 | } |
430 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY)) { |
431 | if (!xfrm6_policy_check(NULL, dir: XFRM_POLICY_IN, skb)) { |
432 | SKB_DR_SET(reason, XFRM_POLICY); |
433 | goto discard; |
434 | } |
435 | nf_reset_ct(skb); |
436 | } |
437 | |
438 | ret = INDIRECT_CALL_2(ipprot->handler, tcp_v6_rcv, udpv6_rcv, |
439 | skb); |
440 | if (ret > 0) { |
441 | if (ipprot->flags & INET6_PROTO_FINAL) { |
442 | /* Not an extension header, most likely UDP |
443 | * encapsulation. Use return value as nexthdr |
444 | * protocol not nhoff (which presumably is |
445 | * not set by handler). |
446 | */ |
447 | nexthdr = ret; |
448 | goto resubmit_final; |
449 | } else { |
450 | goto resubmit; |
451 | } |
452 | } else if (ret == 0) { |
453 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS); |
454 | } |
455 | } else { |
456 | if (!raw) { |
457 | if (xfrm6_policy_check(NULL, dir: XFRM_POLICY_IN, skb)) { |
458 | __IP6_INC_STATS(net, idev, |
459 | IPSTATS_MIB_INUNKNOWNPROTOS); |
460 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
461 | ICMPV6_UNK_NEXTHDR, info: nhoff); |
462 | SKB_DR_SET(reason, IP_NOPROTO); |
463 | } else { |
464 | SKB_DR_SET(reason, XFRM_POLICY); |
465 | } |
466 | kfree_skb_reason(skb, reason); |
467 | } else { |
468 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS); |
469 | consume_skb(skb); |
470 | } |
471 | } |
472 | return; |
473 | |
474 | discard: |
475 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
476 | kfree_skb_reason(skb, reason); |
477 | } |
478 | |
479 | static int ip6_input_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
480 | { |
481 | skb_clear_delivery_time(skb); |
482 | rcu_read_lock(); |
483 | ip6_protocol_deliver_rcu(net, skb, nexthdr: 0, have_final: false); |
484 | rcu_read_unlock(); |
485 | |
486 | return 0; |
487 | } |
488 | |
489 | |
490 | int ip6_input(struct sk_buff *skb) |
491 | { |
492 | return NF_HOOK(pf: NFPROTO_IPV6, hook: NF_INET_LOCAL_IN, |
493 | net: dev_net(dev: skb->dev), NULL, skb, in: skb->dev, NULL, |
494 | okfn: ip6_input_finish); |
495 | } |
496 | EXPORT_SYMBOL_GPL(ip6_input); |
497 | |
498 | int ip6_mc_input(struct sk_buff *skb) |
499 | { |
500 | int sdif = inet6_sdif(skb); |
501 | const struct ipv6hdr *hdr; |
502 | struct net_device *dev; |
503 | bool deliver; |
504 | |
505 | __IP6_UPD_PO_STATS(dev_net(skb_dst(skb)->dev), |
506 | __in6_dev_get_safely(skb->dev), IPSTATS_MIB_INMCAST, |
507 | skb->len); |
508 | |
509 | /* skb->dev passed may be master dev for vrfs. */ |
510 | if (sdif) { |
511 | rcu_read_lock(); |
512 | dev = dev_get_by_index_rcu(net: dev_net(dev: skb->dev), ifindex: sdif); |
513 | if (!dev) { |
514 | rcu_read_unlock(); |
515 | kfree_skb(skb); |
516 | return -ENODEV; |
517 | } |
518 | } else { |
519 | dev = skb->dev; |
520 | } |
521 | |
522 | hdr = ipv6_hdr(skb); |
523 | deliver = ipv6_chk_mcast_addr(dev, group: &hdr->daddr, NULL); |
524 | if (sdif) |
525 | rcu_read_unlock(); |
526 | |
527 | #ifdef CONFIG_IPV6_MROUTE |
528 | /* |
529 | * IPv6 multicast router mode is now supported ;) |
530 | */ |
531 | if (atomic_read(v: &dev_net(dev: skb->dev)->ipv6.devconf_all->mc_forwarding) && |
532 | !(ipv6_addr_type(addr: &hdr->daddr) & |
533 | (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) && |
534 | likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) { |
535 | /* |
536 | * Okay, we try to forward - split and duplicate |
537 | * packets. |
538 | */ |
539 | struct sk_buff *skb2; |
540 | struct inet6_skb_parm *opt = IP6CB(skb); |
541 | |
542 | /* Check for MLD */ |
543 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
544 | /* Check if this is a mld message */ |
545 | u8 nexthdr = hdr->nexthdr; |
546 | __be16 frag_off; |
547 | int offset; |
548 | |
549 | /* Check if the value of Router Alert |
550 | * is for MLD (0x0000). |
551 | */ |
552 | if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) { |
553 | deliver = false; |
554 | |
555 | if (!ipv6_ext_hdr(nexthdr)) { |
556 | /* BUG */ |
557 | goto out; |
558 | } |
559 | offset = ipv6_skip_exthdr(skb, start: sizeof(*hdr), |
560 | nexthdrp: &nexthdr, frag_offp: &frag_off); |
561 | if (offset < 0) |
562 | goto out; |
563 | |
564 | if (ipv6_is_mld(skb, nexthdr, offset)) |
565 | deliver = true; |
566 | |
567 | goto out; |
568 | } |
569 | /* unknown RA - process it normally */ |
570 | } |
571 | |
572 | if (deliver) |
573 | skb2 = skb_clone(skb, GFP_ATOMIC); |
574 | else { |
575 | skb2 = skb; |
576 | skb = NULL; |
577 | } |
578 | |
579 | if (skb2) { |
580 | ip6_mr_input(skb: skb2); |
581 | } |
582 | } |
583 | out: |
584 | #endif |
585 | if (likely(deliver)) |
586 | ip6_input(skb); |
587 | else { |
588 | /* discard */ |
589 | kfree_skb(skb); |
590 | } |
591 | |
592 | return 0; |
593 | } |
594 | |