Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * IPv6 input | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
7 | * Pedro Roque <roque@di.fc.ul.pt> | |
8 | * Ian P. Morris <I.P.Morris@soton.ac.uk> | |
9 | * | |
1da177e4 | 10 | * Based in linux/net/ipv4/ip_input.c |
1da177e4 LT |
11 | */ |
12 | /* Changes | |
13 | * | |
67ba4152 IM |
14 | * Mitsuru KANDA @USAGI and |
15 | * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs(). | |
1da177e4 LT |
16 | */ |
17 | ||
18 | #include <linux/errno.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/sockios.h> | |
1da177e4 LT |
22 | #include <linux/net.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/in6.h> | |
25 | #include <linux/icmpv6.h> | |
7bc570c8 | 26 | #include <linux/mroute6.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
0e219ae4 | 28 | #include <linux/indirect_call_wrapper.h> |
1da177e4 LT |
29 | |
30 | #include <linux/netfilter.h> | |
31 | #include <linux/netfilter_ipv6.h> | |
32 | ||
33 | #include <net/sock.h> | |
34 | #include <net/snmp.h> | |
35 | ||
36 | #include <net/ipv6.h> | |
37 | #include <net/protocol.h> | |
38 | #include <net/transp_v6.h> | |
39 | #include <net/rawv6.h> | |
40 | #include <net/ndisc.h> | |
41 | #include <net/ip6_route.h> | |
42 | #include <net/addrconf.h> | |
43 | #include <net/xfrm.h> | |
1f07d03e | 44 | #include <net/inet_ecn.h> |
48fb6b55 | 45 | #include <net/dst_metadata.h> |
1da177e4 | 46 | |
97ff7ffb PA |
47 | INDIRECT_CALLABLE_DECLARE(void udp_v6_early_demux(struct sk_buff *)); |
48 | INDIRECT_CALLABLE_DECLARE(void tcp_v6_early_demux(struct sk_buff *)); | |
d8269e2c EC |
49 | static void ip6_rcv_finish_core(struct net *net, struct sock *sk, |
50 | struct sk_buff *skb) | |
1da177e4 | 51 | { |
dddb64bc | 52 | void (*edemux)(struct sk_buff *skb); |
53 | ||
e21145a9 | 54 | if (net->ipv4.sysctl_ip_early_demux && !skb_dst(skb) && skb->sk == NULL) { |
c7109986 ED |
55 | const struct inet6_protocol *ipprot; |
56 | ||
c7109986 | 57 | ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]); |
dddb64bc | 58 | if (ipprot && (edemux = READ_ONCE(ipprot->early_demux))) |
97ff7ffb PA |
59 | INDIRECT_CALL_2(edemux, tcp_v6_early_demux, |
60 | udp_v6_early_demux, skb); | |
c7109986 | 61 | } |
48fb6b55 | 62 | if (!skb_valid_dst(skb)) |
1da177e4 | 63 | ip6_route_input(skb); |
d8269e2c EC |
64 | } |
65 | ||
66 | int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) | |
67 | { | |
68 | /* if ingress device is enslaved to an L3 master device pass the | |
69 | * skb to its handler for processing | |
70 | */ | |
71 | skb = l3mdev_ip6_rcv(skb); | |
72 | if (!skb) | |
73 | return NET_RX_SUCCESS; | |
74 | ip6_rcv_finish_core(net, sk, skb); | |
1da177e4 LT |
75 | |
76 | return dst_input(skb); | |
77 | } | |
78 | ||
d8269e2c EC |
79 | static void ip6_sublist_rcv_finish(struct list_head *head) |
80 | { | |
81 | struct sk_buff *skb, *next; | |
82 | ||
c7a42eb4 XL |
83 | list_for_each_entry_safe(skb, next, head, list) { |
84 | skb_list_del_init(skb); | |
d8269e2c | 85 | dst_input(skb); |
c7a42eb4 | 86 | } |
d8269e2c EC |
87 | } |
88 | ||
197dbf24 PA |
89 | static bool ip6_can_use_hint(const struct sk_buff *skb, |
90 | const struct sk_buff *hint) | |
91 | { | |
92 | return hint && !skb_dst(skb) && | |
93 | ipv6_addr_equal(&ipv6_hdr(hint)->daddr, &ipv6_hdr(skb)->daddr); | |
94 | } | |
95 | ||
96 | static struct sk_buff *ip6_extract_route_hint(const struct net *net, | |
97 | struct sk_buff *skb) | |
98 | { | |
99 | if (fib6_routes_require_src(net) || fib6_has_custom_rules(net)) | |
100 | return NULL; | |
101 | ||
102 | return skb; | |
103 | } | |
104 | ||
d8269e2c EC |
105 | static void ip6_list_rcv_finish(struct net *net, struct sock *sk, |
106 | struct list_head *head) | |
107 | { | |
197dbf24 | 108 | struct sk_buff *skb, *next, *hint = NULL; |
d8269e2c | 109 | struct dst_entry *curr_dst = NULL; |
d8269e2c EC |
110 | struct list_head sublist; |
111 | ||
112 | INIT_LIST_HEAD(&sublist); | |
113 | list_for_each_entry_safe(skb, next, head, list) { | |
114 | struct dst_entry *dst; | |
115 | ||
22f6bbb7 | 116 | skb_list_del_init(skb); |
d8269e2c EC |
117 | /* if ingress device is enslaved to an L3 master device pass the |
118 | * skb to its handler for processing | |
119 | */ | |
120 | skb = l3mdev_ip6_rcv(skb); | |
121 | if (!skb) | |
122 | continue; | |
197dbf24 PA |
123 | |
124 | if (ip6_can_use_hint(skb, hint)) | |
125 | skb_dst_copy(skb, hint); | |
126 | else | |
127 | ip6_rcv_finish_core(net, sk, skb); | |
d8269e2c EC |
128 | dst = skb_dst(skb); |
129 | if (curr_dst != dst) { | |
197dbf24 PA |
130 | hint = ip6_extract_route_hint(net, skb); |
131 | ||
d8269e2c EC |
132 | /* dispatch old sublist */ |
133 | if (!list_empty(&sublist)) | |
134 | ip6_sublist_rcv_finish(&sublist); | |
135 | /* start new sublist */ | |
136 | INIT_LIST_HEAD(&sublist); | |
137 | curr_dst = dst; | |
138 | } | |
139 | list_add_tail(&skb->list, &sublist); | |
140 | } | |
141 | /* dispatch final sublist */ | |
142 | ip6_sublist_rcv_finish(&sublist); | |
143 | } | |
144 | ||
145 | static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev, | |
146 | struct net *net) | |
1da177e4 | 147 | { |
b71d1d42 | 148 | const struct ipv6hdr *hdr; |
67ba4152 | 149 | u32 pkt_len; |
a11d206d | 150 | struct inet6_dev *idev; |
1da177e4 | 151 | |
a11d206d YH |
152 | if (skb->pkt_type == PACKET_OTHERHOST) { |
153 | kfree_skb(skb); | |
d8269e2c | 154 | return NULL; |
a11d206d YH |
155 | } |
156 | ||
157 | rcu_read_lock(); | |
1da177e4 | 158 | |
a11d206d YH |
159 | idev = __in6_dev_get(skb->dev); |
160 | ||
c2005eb0 | 161 | __IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_IN, skb->len); |
1da177e4 | 162 | |
778d80be YH |
163 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL || |
164 | !idev || unlikely(idev->cnf.disable_ipv6)) { | |
1d015503 | 165 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
71f6f6df | 166 | goto drop; |
1da177e4 LT |
167 | } |
168 | ||
6b7fdc3a GC |
169 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Store incoming device index. When the packet will | |
173 | * be queued, we cannot refer to skb->dev anymore. | |
174 | * | |
175 | * BTW, when we send a packet for our own local address on a | |
176 | * non-loopback interface (e.g. ethX), it is being delivered | |
de3cb747 | 177 | * via the loopback interface (lo) here; skb->dev = loopback_dev. |
1da177e4 LT |
178 | * It, however, should be considered as if it is being |
179 | * arrived via the sending interface (ethX), because of the | |
180 | * nature of scoping architecture. --yoshfuji | |
181 | */ | |
48fb6b55 | 182 | IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex; |
1da177e4 | 183 | |
2889139a | 184 | if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) |
1da177e4 LT |
185 | goto err; |
186 | ||
0660e03f | 187 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
188 | |
189 | if (hdr->version != 6) | |
190 | goto err; | |
191 | ||
1d015503 ED |
192 | __IP6_ADD_STATS(net, idev, |
193 | IPSTATS_MIB_NOECTPKTS + | |
1f07d03e | 194 | (ipv6_get_dsfield(hdr) & INET_ECN_MASK), |
1d015503 | 195 | max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs)); |
f630e43a YH |
196 | /* |
197 | * RFC4291 2.5.3 | |
0aa8c13e FW |
198 | * The loopback address must not be used as the source address in IPv6 |
199 | * packets that are sent outside of a single node. [..] | |
f630e43a YH |
200 | * A packet received on an interface with a destination address |
201 | * of loopback must be dropped. | |
202 | */ | |
0aa8c13e FW |
203 | if ((ipv6_addr_loopback(&hdr->saddr) || |
204 | ipv6_addr_loopback(&hdr->daddr)) && | |
3ede0bbc RS |
205 | !(dev->flags & IFF_LOOPBACK) && |
206 | !netif_is_l3_master(dev)) | |
f630e43a YH |
207 | goto err; |
208 | ||
1c4a154e HFS |
209 | /* RFC4291 Errata ID: 3480 |
210 | * Interface-Local scope spans only a single interface on a | |
211 | * node and is useful only for loopback transmission of | |
212 | * multicast. Packets with interface-local scope received | |
213 | * from another node must be discarded. | |
214 | */ | |
215 | if (!(skb->pkt_type == PACKET_LOOPBACK || | |
216 | dev->flags & IFF_LOOPBACK) && | |
217 | ipv6_addr_is_multicast(&hdr->daddr) && | |
218 | IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1) | |
219 | goto err; | |
220 | ||
abbc3043 JB |
221 | /* If enabled, drop unicast packets that were encapsulated in link-layer |
222 | * multicast or broadcast to protected against the so-called "hole-196" | |
223 | * attack in 802.11 wireless. | |
224 | */ | |
225 | if (!ipv6_addr_is_multicast(&hdr->daddr) && | |
226 | (skb->pkt_type == PACKET_BROADCAST || | |
227 | skb->pkt_type == PACKET_MULTICAST) && | |
228 | idev->cnf.drop_unicast_in_l2_multicast) | |
229 | goto err; | |
230 | ||
20314092 HFS |
231 | /* RFC4291 2.7 |
232 | * Nodes must not originate a packet to a multicast address whose scope | |
233 | * field contains the reserved value 0; if such a packet is received, it | |
234 | * must be silently dropped. | |
235 | */ | |
236 | if (ipv6_addr_is_multicast(&hdr->daddr) && | |
237 | IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0) | |
238 | goto err; | |
239 | ||
c457338d BH |
240 | /* |
241 | * RFC4291 2.7 | |
242 | * Multicast addresses must not be used as source addresses in IPv6 | |
243 | * packets or appear in any Routing header. | |
244 | */ | |
245 | if (ipv6_addr_is_multicast(&hdr->saddr)) | |
246 | goto err; | |
247 | ||
6af1799a ED |
248 | /* While RFC4291 is not explicit about v4mapped addresses |
249 | * in IPv6 headers, it seems clear linux dual-stack | |
250 | * model can not deal properly with these. | |
251 | * Security models could be fooled by ::ffff:127.0.0.1 for example. | |
252 | * | |
253 | * https://tools.ietf.org/html/draft-itojun-v6ops-v4mapped-harmful-02 | |
254 | */ | |
255 | if (ipv6_addr_v4mapped(&hdr->saddr)) | |
256 | goto err; | |
257 | ||
b0e380b1 | 258 | skb->transport_header = skb->network_header + sizeof(*hdr); |
951dbc8a PM |
259 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
260 | ||
1da177e4 LT |
261 | pkt_len = ntohs(hdr->payload_len); |
262 | ||
263 | /* pkt_len may be zero if Jumbo payload option is present */ | |
264 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
60e5c166 | 265 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
1d015503 ED |
266 | __IP6_INC_STATS(net, |
267 | idev, IPSTATS_MIB_INTRUNCATEDPKTS); | |
60e5c166 MC |
268 | goto drop; |
269 | } | |
1da177e4 | 270 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) { |
1d015503 | 271 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
272 | goto drop; |
273 | } | |
0660e03f | 274 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
275 | } |
276 | ||
277 | if (hdr->nexthdr == NEXTHDR_HOP) { | |
e5bbef20 | 278 | if (ipv6_parse_hopopts(skb) < 0) { |
1d015503 | 279 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
a11d206d | 280 | rcu_read_unlock(); |
d8269e2c | 281 | return NULL; |
1da177e4 | 282 | } |
1da177e4 LT |
283 | } |
284 | ||
a11d206d YH |
285 | rcu_read_unlock(); |
286 | ||
71f9dacd | 287 | /* Must drop socket now because of tproxy. */ |
cf7fbe66 JS |
288 | if (!skb_sk_is_prefetched(skb)) |
289 | skb_orphan(skb); | |
71f9dacd | 290 | |
d8269e2c | 291 | return skb; |
1da177e4 | 292 | err: |
1d015503 | 293 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 294 | drop: |
a11d206d | 295 | rcu_read_unlock(); |
1da177e4 | 296 | kfree_skb(skb); |
d8269e2c EC |
297 | return NULL; |
298 | } | |
299 | ||
300 | int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) | |
301 | { | |
302 | struct net *net = dev_net(skb->dev); | |
303 | ||
304 | skb = ip6_rcv_core(skb, dev, net); | |
305 | if (skb == NULL) | |
306 | return NET_RX_DROP; | |
307 | return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, | |
308 | net, NULL, skb, dev, NULL, | |
309 | ip6_rcv_finish); | |
310 | } | |
311 | ||
312 | static void ip6_sublist_rcv(struct list_head *head, struct net_device *dev, | |
313 | struct net *net) | |
314 | { | |
315 | NF_HOOK_LIST(NFPROTO_IPV6, NF_INET_PRE_ROUTING, net, NULL, | |
316 | head, dev, NULL, ip6_rcv_finish); | |
317 | ip6_list_rcv_finish(net, NULL, head); | |
318 | } | |
319 | ||
320 | /* Receive a list of IPv6 packets */ | |
321 | void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, | |
322 | struct net_device *orig_dev) | |
323 | { | |
324 | struct net_device *curr_dev = NULL; | |
325 | struct net *curr_net = NULL; | |
326 | struct sk_buff *skb, *next; | |
327 | struct list_head sublist; | |
328 | ||
329 | INIT_LIST_HEAD(&sublist); | |
330 | list_for_each_entry_safe(skb, next, head, list) { | |
331 | struct net_device *dev = skb->dev; | |
332 | struct net *net = dev_net(dev); | |
333 | ||
22f6bbb7 | 334 | skb_list_del_init(skb); |
d8269e2c EC |
335 | skb = ip6_rcv_core(skb, dev, net); |
336 | if (skb == NULL) | |
337 | continue; | |
338 | ||
339 | if (curr_dev != dev || curr_net != net) { | |
340 | /* dispatch old sublist */ | |
341 | if (!list_empty(&sublist)) | |
342 | ip6_sublist_rcv(&sublist, curr_dev, curr_net); | |
343 | /* start new sublist */ | |
344 | INIT_LIST_HEAD(&sublist); | |
345 | curr_dev = dev; | |
346 | curr_net = net; | |
347 | } | |
348 | list_add_tail(&skb->list, &sublist); | |
349 | } | |
350 | /* dispatch final sublist */ | |
51210ad5 FW |
351 | if (!list_empty(&sublist)) |
352 | ip6_sublist_rcv(&sublist, curr_dev, curr_net); | |
1da177e4 LT |
353 | } |
354 | ||
0e219ae4 PA |
355 | INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *)); |
356 | INDIRECT_CALLABLE_DECLARE(int tcp_v6_rcv(struct sk_buff *)); | |
357 | ||
1da177e4 LT |
358 | /* |
359 | * Deliver the packet to the host | |
360 | */ | |
80bde363 PA |
361 | void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, |
362 | bool have_final) | |
1da177e4 | 363 | { |
41135cc8 | 364 | const struct inet6_protocol *ipprot; |
f9242b6b | 365 | struct inet6_dev *idev; |
1da177e4 | 366 | unsigned int nhoff; |
a50feda5 | 367 | bool raw; |
1da177e4 | 368 | |
1da177e4 LT |
369 | /* |
370 | * Parse extension headers | |
371 | */ | |
372 | ||
1b0ccfe5 | 373 | resubmit: |
adf30907 | 374 | idev = ip6_dst_idev(skb_dst(skb)); |
951dbc8a | 375 | nhoff = IP6CB(skb)->nhoff; |
80bde363 PA |
376 | if (!have_final) { |
377 | if (!pskb_pull(skb, skb_transport_offset(skb))) | |
378 | goto discard; | |
379 | nexthdr = skb_network_header(skb)[nhoff]; | |
380 | } | |
1da177e4 | 381 | |
4c64242a | 382 | resubmit_final: |
69d6da0b | 383 | raw = raw6_local_deliver(skb, nexthdr); |
e5d08d71 | 384 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
53b24b8f | 385 | if (ipprot) { |
1da177e4 | 386 | int ret; |
1ab1457c | 387 | |
1da44f9c TH |
388 | if (have_final) { |
389 | if (!(ipprot->flags & INET6_PROTO_FINAL)) { | |
390 | /* Once we've seen a final protocol don't | |
391 | * allow encapsulation on any non-final | |
392 | * ones. This allows foo in UDP encapsulation | |
393 | * to work. | |
394 | */ | |
395 | goto discard; | |
396 | } | |
397 | } else if (ipprot->flags & INET6_PROTO_FINAL) { | |
b71d1d42 | 398 | const struct ipv6hdr *hdr; |
5226b6a9 MM |
399 | int sdif = inet6_sdif(skb); |
400 | struct net_device *dev; | |
1da177e4 | 401 | |
1da44f9c TH |
402 | /* Only do this once for first final protocol */ |
403 | have_final = true; | |
404 | ||
9fb9cbb1 YK |
405 | /* Free reference early: we don't need it any more, |
406 | and it may hold ip_conntrack module loaded | |
407 | indefinitely. */ | |
895b5c9f | 408 | nf_reset_ct(skb); |
9fb9cbb1 | 409 | |
d56f90a7 | 410 | skb_postpull_rcsum(skb, skb_network_header(skb), |
cfe1fc77 | 411 | skb_network_header_len(skb)); |
0660e03f | 412 | hdr = ipv6_hdr(skb); |
5226b6a9 MM |
413 | |
414 | /* skb->dev passed may be master dev for vrfs. */ | |
415 | if (sdif) { | |
416 | dev = dev_get_by_index_rcu(net, sdif); | |
417 | if (!dev) | |
418 | goto discard; | |
419 | } else { | |
420 | dev = skb->dev; | |
421 | } | |
422 | ||
1da177e4 | 423 | if (ipv6_addr_is_multicast(&hdr->daddr) && |
5226b6a9 MM |
424 | !ipv6_chk_mcast_addr(dev, &hdr->daddr, |
425 | &hdr->saddr) && | |
daad1512 | 426 | !ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb))) |
1da177e4 LT |
427 | goto discard; |
428 | } | |
429 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY) && | |
1ab1457c | 430 | !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
1da177e4 | 431 | goto discard; |
1ab1457c | 432 | |
0e219ae4 PA |
433 | ret = INDIRECT_CALL_2(ipprot->handler, tcp_v6_rcv, udpv6_rcv, |
434 | skb); | |
4c64242a TH |
435 | if (ret > 0) { |
436 | if (ipprot->flags & INET6_PROTO_FINAL) { | |
437 | /* Not an extension header, most likely UDP | |
438 | * encapsulation. Use return value as nexthdr | |
439 | * protocol not nhoff (which presumably is | |
440 | * not set by handler). | |
441 | */ | |
442 | nexthdr = ret; | |
443 | goto resubmit_final; | |
444 | } else { | |
445 | goto resubmit; | |
446 | } | |
447 | } else if (ret == 0) { | |
1d015503 | 448 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS); |
4c64242a | 449 | } |
1da177e4 | 450 | } else { |
69d6da0b | 451 | if (!raw) { |
1da177e4 | 452 | if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
1d015503 ED |
453 | __IP6_INC_STATS(net, idev, |
454 | IPSTATS_MIB_INUNKNOWNPROTOS); | |
fad87aca | 455 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
3ffe533c | 456 | ICMPV6_UNK_NEXTHDR, nhoff); |
1da177e4 | 457 | } |
d8c6f4b9 NH |
458 | kfree_skb(skb); |
459 | } else { | |
1d015503 | 460 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS); |
d8c6f4b9 NH |
461 | consume_skb(skb); |
462 | } | |
1da177e4 | 463 | } |
80bde363 | 464 | return; |
1da177e4 LT |
465 | |
466 | discard: | |
1d015503 | 467 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
1da177e4 | 468 | kfree_skb(skb); |
80bde363 PA |
469 | } |
470 | ||
471 | static int ip6_input_finish(struct net *net, struct sock *sk, struct sk_buff *skb) | |
472 | { | |
473 | rcu_read_lock(); | |
474 | ip6_protocol_deliver_rcu(net, skb, 0, false); | |
475 | rcu_read_unlock(); | |
476 | ||
1da177e4 LT |
477 | return 0; |
478 | } | |
479 | ||
480 | ||
481 | int ip6_input(struct sk_buff *skb) | |
482 | { | |
29a26a56 EB |
483 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN, |
484 | dev_net(skb->dev), NULL, skb, skb->dev, NULL, | |
6e23ae2a | 485 | ip6_input_finish); |
1da177e4 | 486 | } |
b4869aa2 | 487 | EXPORT_SYMBOL_GPL(ip6_input); |
1da177e4 LT |
488 | |
489 | int ip6_mc_input(struct sk_buff *skb) | |
490 | { | |
5226b6a9 | 491 | int sdif = inet6_sdif(skb); |
b71d1d42 | 492 | const struct ipv6hdr *hdr; |
5226b6a9 | 493 | struct net_device *dev; |
a50feda5 | 494 | bool deliver; |
1da177e4 | 495 | |
c2005eb0 | 496 | __IP6_UPD_PO_STATS(dev_net(skb_dst(skb)->dev), |
bdb7cc64 | 497 | __in6_dev_get_safely(skb->dev), IPSTATS_MIB_INMCAST, |
edf391ff | 498 | skb->len); |
1da177e4 | 499 | |
5226b6a9 MM |
500 | /* skb->dev passed may be master dev for vrfs. */ |
501 | if (sdif) { | |
502 | rcu_read_lock(); | |
503 | dev = dev_get_by_index_rcu(dev_net(skb->dev), sdif); | |
504 | if (!dev) { | |
505 | rcu_read_unlock(); | |
506 | kfree_skb(skb); | |
507 | return -ENODEV; | |
508 | } | |
509 | } else { | |
510 | dev = skb->dev; | |
511 | } | |
512 | ||
0660e03f | 513 | hdr = ipv6_hdr(skb); |
5226b6a9 MM |
514 | deliver = ipv6_chk_mcast_addr(dev, &hdr->daddr, NULL); |
515 | if (sdif) | |
516 | rcu_read_unlock(); | |
1da177e4 | 517 | |
7bc570c8 | 518 | #ifdef CONFIG_IPV6_MROUTE |
1da177e4 | 519 | /* |
7bc570c8 | 520 | * IPv6 multicast router mode is now supported ;) |
1da177e4 | 521 | */ |
53b7997f | 522 | if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding && |
ddf64354 HFS |
523 | !(ipv6_addr_type(&hdr->daddr) & |
524 | (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) && | |
7bc570c8 YH |
525 | likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) { |
526 | /* | |
527 | * Okay, we try to forward - split and duplicate | |
528 | * packets. | |
529 | */ | |
530 | struct sk_buff *skb2; | |
531 | struct inet6_skb_parm *opt = IP6CB(skb); | |
532 | ||
533 | /* Check for MLD */ | |
dd3332bf | 534 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
7bc570c8 | 535 | /* Check if this is a mld message */ |
7bc570c8 | 536 | u8 nexthdr = hdr->nexthdr; |
75f2811c | 537 | __be16 frag_off; |
7bc570c8 YH |
538 | int offset; |
539 | ||
540 | /* Check if the value of Router Alert | |
541 | * is for MLD (0x0000). | |
542 | */ | |
dd3332bf | 543 | if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) { |
a50feda5 | 544 | deliver = false; |
aba6096b | 545 | |
7bc570c8 YH |
546 | if (!ipv6_ext_hdr(nexthdr)) { |
547 | /* BUG */ | |
aba6096b | 548 | goto out; |
7bc570c8 YH |
549 | } |
550 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), | |
75f2811c | 551 | &nexthdr, &frag_off); |
7bc570c8 | 552 | if (offset < 0) |
aba6096b | 553 | goto out; |
7bc570c8 | 554 | |
4c938d22 A |
555 | if (ipv6_is_mld(skb, nexthdr, offset)) |
556 | deliver = true; | |
7bc570c8 | 557 | |
4c938d22 | 558 | goto out; |
7bc570c8 YH |
559 | } |
560 | /* unknown RA - process it normally */ | |
561 | } | |
1da177e4 | 562 | |
7bc570c8 YH |
563 | if (deliver) |
564 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
565 | else { | |
566 | skb2 = skb; | |
567 | skb = NULL; | |
568 | } | |
1ab1457c | 569 | |
7bc570c8 | 570 | if (skb2) { |
7bc570c8 | 571 | ip6_mr_input(skb2); |
1da177e4 LT |
572 | } |
573 | } | |
7bc570c8 | 574 | out: |
aba6096b YH |
575 | #endif |
576 | if (likely(deliver)) | |
1da177e4 | 577 | ip6_input(skb); |
aba6096b YH |
578 | else { |
579 | /* discard */ | |
580 | kfree_skb(skb); | |
1da177e4 | 581 | } |
1da177e4 LT |
582 | |
583 | return 0; | |
584 | } |