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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Internet Control Message Protocol (ICMPv6) | |
4 | * Linux INET6 implementation | |
5 | * | |
6 | * Authors: | |
7 | * Pedro Roque <roque@di.fc.ul.pt> | |
8 | * | |
1da177e4 LT |
9 | * Based on net/ipv4/icmp.c |
10 | * | |
11 | * RFC 1885 | |
1da177e4 LT |
12 | */ |
13 | ||
14 | /* | |
15 | * Changes: | |
16 | * | |
17 | * Andi Kleen : exception handling | |
18 | * Andi Kleen add rate limits. never reply to a icmp. | |
19 | * add more length checks and other fixes. | |
20 | * yoshfuji : ensure to sent parameter problem for | |
21 | * fragments. | |
22 | * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. | |
23 | * Randy Dunlap and | |
24 | * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support | |
25 | * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data | |
26 | */ | |
27 | ||
f3213831 JP |
28 | #define pr_fmt(fmt) "IPv6: " fmt |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/errno.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/kernel.h> | |
1da177e4 LT |
36 | #include <linux/sockios.h> |
37 | #include <linux/net.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/init.h> | |
763ecff1 | 40 | #include <linux/netfilter.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 LT |
42 | |
43 | #ifdef CONFIG_SYSCTL | |
44 | #include <linux/sysctl.h> | |
45 | #endif | |
46 | ||
47 | #include <linux/inet.h> | |
48 | #include <linux/netdevice.h> | |
49 | #include <linux/icmpv6.h> | |
50 | ||
51 | #include <net/ip.h> | |
52 | #include <net/sock.h> | |
53 | ||
54 | #include <net/ipv6.h> | |
55 | #include <net/ip6_checksum.h> | |
6d0bfe22 | 56 | #include <net/ping.h> |
1da177e4 LT |
57 | #include <net/protocol.h> |
58 | #include <net/raw.h> | |
59 | #include <net/rawv6.h> | |
60 | #include <net/transp_v6.h> | |
61 | #include <net/ip6_route.h> | |
62 | #include <net/addrconf.h> | |
63 | #include <net/icmp.h> | |
8b7817f3 | 64 | #include <net/xfrm.h> |
1ed8516f | 65 | #include <net/inet_common.h> |
825edac4 | 66 | #include <net/dsfield.h> |
ca254490 | 67 | #include <net/l3mdev.h> |
1da177e4 | 68 | |
7c0f6ba6 | 69 | #include <linux/uaccess.h> |
1da177e4 | 70 | |
1da177e4 LT |
71 | /* |
72 | * The ICMP socket(s). This is the most convenient way to flow control | |
73 | * our ICMP output as well as maintain a clean interface throughout | |
74 | * all layers. All Socketless IP sends will soon be gone. | |
75 | * | |
76 | * On SMP we have one ICMP socket per-cpu. | |
77 | */ | |
2789c14d | 78 | static struct sock *icmpv6_sk(struct net *net) |
98c6d1b2 | 79 | { |
2789c14d | 80 | return this_cpu_read(*net->ipv6.icmp_sk); |
98c6d1b2 | 81 | } |
1da177e4 | 82 | |
32bbd879 | 83 | static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
6f809da2 SK |
84 | u8 type, u8 code, int offset, __be32 info) |
85 | { | |
6d0bfe22 LC |
86 | /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ |
87 | struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); | |
6f809da2 SK |
88 | struct net *net = dev_net(skb->dev); |
89 | ||
90 | if (type == ICMPV6_PKT_TOOBIG) | |
5f379ef5 | 91 | ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL)); |
6f809da2 | 92 | else if (type == NDISC_REDIRECT) |
e2d118a1 LC |
93 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
94 | sock_net_uid(net, NULL)); | |
6d0bfe22 LC |
95 | |
96 | if (!(type & ICMPV6_INFOMSG_MASK)) | |
97 | if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) | |
dcb94b88 | 98 | ping_err(skb, offset, ntohl(info)); |
32bbd879 SB |
99 | |
100 | return 0; | |
6f809da2 SK |
101 | } |
102 | ||
e5bbef20 | 103 | static int icmpv6_rcv(struct sk_buff *skb); |
1da177e4 | 104 | |
41135cc8 | 105 | static const struct inet6_protocol icmpv6_protocol = { |
1da177e4 | 106 | .handler = icmpv6_rcv, |
6f809da2 | 107 | .err_handler = icmpv6_err, |
8b7817f3 | 108 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1da177e4 LT |
109 | }; |
110 | ||
7ba91ecb | 111 | /* Called with BH disabled */ |
fdc0bde9 | 112 | static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) |
1da177e4 | 113 | { |
fdc0bde9 DL |
114 | struct sock *sk; |
115 | ||
fdc0bde9 | 116 | sk = icmpv6_sk(net); |
405666db | 117 | if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { |
1da177e4 LT |
118 | /* This can happen if the output path (f.e. SIT or |
119 | * ip6ip6 tunnel) signals dst_link_failure() for an | |
120 | * outgoing ICMP6 packet. | |
121 | */ | |
fdc0bde9 | 122 | return NULL; |
1da177e4 | 123 | } |
fdc0bde9 | 124 | return sk; |
1da177e4 LT |
125 | } |
126 | ||
405666db | 127 | static __inline__ void icmpv6_xmit_unlock(struct sock *sk) |
1da177e4 | 128 | { |
7ba91ecb | 129 | spin_unlock(&sk->sk_lock.slock); |
1da177e4 LT |
130 | } |
131 | ||
1da177e4 LT |
132 | /* |
133 | * Figure out, may we reply to this packet with icmp error. | |
134 | * | |
135 | * We do not reply, if: | |
136 | * - it was icmp error message. | |
137 | * - it is truncated, so that it is known, that protocol is ICMPV6 | |
138 | * (i.e. in the middle of some exthdr) | |
139 | * | |
140 | * --ANK (980726) | |
141 | */ | |
142 | ||
a50feda5 | 143 | static bool is_ineligible(const struct sk_buff *skb) |
1da177e4 | 144 | { |
0660e03f | 145 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
1da177e4 | 146 | int len = skb->len - ptr; |
0660e03f | 147 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
75f2811c | 148 | __be16 frag_off; |
1da177e4 LT |
149 | |
150 | if (len < 0) | |
a50feda5 | 151 | return true; |
1da177e4 | 152 | |
75f2811c | 153 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); |
1da177e4 | 154 | if (ptr < 0) |
a50feda5 | 155 | return false; |
1da177e4 LT |
156 | if (nexthdr == IPPROTO_ICMPV6) { |
157 | u8 _type, *tp; | |
158 | tp = skb_header_pointer(skb, | |
159 | ptr+offsetof(struct icmp6hdr, icmp6_type), | |
160 | sizeof(_type), &_type); | |
63159f29 | 161 | if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) |
a50feda5 | 162 | return true; |
1da177e4 | 163 | } |
a50feda5 | 164 | return false; |
1da177e4 LT |
165 | } |
166 | ||
0bc19985 | 167 | static bool icmpv6_mask_allow(struct net *net, int type) |
c0303efe | 168 | { |
0bc19985 | 169 | if (type > ICMPV6_MSG_MAX) |
c0303efe JDB |
170 | return true; |
171 | ||
0bc19985 SS |
172 | /* Limit if icmp type is set in ratemask. */ |
173 | if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask)) | |
c0303efe JDB |
174 | return true; |
175 | ||
176 | return false; | |
177 | } | |
178 | ||
0bc19985 | 179 | static bool icmpv6_global_allow(struct net *net, int type) |
c0303efe | 180 | { |
0bc19985 | 181 | if (icmpv6_mask_allow(net, type)) |
c0303efe JDB |
182 | return true; |
183 | ||
184 | if (icmp_global_allow()) | |
185 | return true; | |
186 | ||
187 | return false; | |
188 | } | |
189 | ||
1ab1457c YH |
190 | /* |
191 | * Check the ICMP output rate limit | |
1da177e4 | 192 | */ |
4cdf507d ED |
193 | static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, |
194 | struct flowi6 *fl6) | |
1da177e4 | 195 | { |
3b1e0a65 | 196 | struct net *net = sock_net(sk); |
4cdf507d | 197 | struct dst_entry *dst; |
92d86829 | 198 | bool res = false; |
1da177e4 | 199 | |
0bc19985 | 200 | if (icmpv6_mask_allow(net, type)) |
92d86829 | 201 | return true; |
1da177e4 | 202 | |
1ab1457c | 203 | /* |
1da177e4 LT |
204 | * Look up the output route. |
205 | * XXX: perhaps the expire for routing entries cloned by | |
206 | * this lookup should be more aggressive (not longer than timeout). | |
207 | */ | |
4c9483b2 | 208 | dst = ip6_route_output(net, sk, fl6); |
1da177e4 | 209 | if (dst->error) { |
3bd653c8 | 210 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
a11d206d | 211 | IPSTATS_MIB_OUTNOROUTES); |
1da177e4 | 212 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
92d86829 | 213 | res = true; |
1da177e4 LT |
214 | } else { |
215 | struct rt6_info *rt = (struct rt6_info *)dst; | |
9a43b709 | 216 | int tmo = net->ipv6.sysctl.icmpv6_time; |
c0303efe | 217 | struct inet_peer *peer; |
1da177e4 LT |
218 | |
219 | /* Give more bandwidth to wider prefixes. */ | |
220 | if (rt->rt6i_dst.plen < 128) | |
221 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); | |
222 | ||
c0303efe JDB |
223 | peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); |
224 | res = inet_peer_xrlim_allow(peer, tmo); | |
225 | if (peer) | |
226 | inet_putpeer(peer); | |
1da177e4 LT |
227 | } |
228 | dst_release(dst); | |
229 | return res; | |
230 | } | |
231 | ||
232 | /* | |
233 | * an inline helper for the "simple" if statement below | |
234 | * checks if parameter problem report is caused by an | |
1ab1457c | 235 | * unrecognized IPv6 option that has the Option Type |
1da177e4 LT |
236 | * highest-order two bits set to 10 |
237 | */ | |
238 | ||
a50feda5 | 239 | static bool opt_unrec(struct sk_buff *skb, __u32 offset) |
1da177e4 LT |
240 | { |
241 | u8 _optval, *op; | |
242 | ||
bbe735e4 | 243 | offset += skb_network_offset(skb); |
1da177e4 | 244 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
63159f29 | 245 | if (!op) |
a50feda5 | 246 | return true; |
1da177e4 LT |
247 | return (*op & 0xC0) == 0x80; |
248 | } | |
249 | ||
4e64b1ed JP |
250 | void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
251 | struct icmp6hdr *thdr, int len) | |
1da177e4 LT |
252 | { |
253 | struct sk_buff *skb; | |
254 | struct icmp6hdr *icmp6h; | |
1da177e4 | 255 | |
e5d08d71 | 256 | skb = skb_peek(&sk->sk_write_queue); |
63159f29 | 257 | if (!skb) |
4e64b1ed | 258 | return; |
1da177e4 | 259 | |
cc70ab26 | 260 | icmp6h = icmp6_hdr(skb); |
1da177e4 LT |
261 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
262 | icmp6h->icmp6_cksum = 0; | |
263 | ||
264 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
07f0757a | 265 | skb->csum = csum_partial(icmp6h, |
1da177e4 | 266 | sizeof(struct icmp6hdr), skb->csum); |
4c9483b2 DM |
267 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
268 | &fl6->daddr, | |
269 | len, fl6->flowi6_proto, | |
1da177e4 LT |
270 | skb->csum); |
271 | } else { | |
868c86bc | 272 | __wsum tmp_csum = 0; |
1da177e4 LT |
273 | |
274 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
275 | tmp_csum = csum_add(tmp_csum, skb->csum); | |
276 | } | |
277 | ||
07f0757a | 278 | tmp_csum = csum_partial(icmp6h, |
1da177e4 | 279 | sizeof(struct icmp6hdr), tmp_csum); |
4c9483b2 DM |
280 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
281 | &fl6->daddr, | |
282 | len, fl6->flowi6_proto, | |
868c86bc | 283 | tmp_csum); |
1da177e4 | 284 | } |
1da177e4 | 285 | ip6_push_pending_frames(sk); |
1da177e4 LT |
286 | } |
287 | ||
288 | struct icmpv6_msg { | |
289 | struct sk_buff *skb; | |
290 | int offset; | |
763ecff1 | 291 | uint8_t type; |
1da177e4 LT |
292 | }; |
293 | ||
294 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) | |
295 | { | |
296 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; | |
297 | struct sk_buff *org_skb = msg->skb; | |
5f92a738 | 298 | __wsum csum = 0; |
1da177e4 LT |
299 | |
300 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, | |
301 | to, len, csum); | |
302 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
763ecff1 YK |
303 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
304 | nf_ct_attach(skb, org_skb); | |
1da177e4 LT |
305 | return 0; |
306 | } | |
307 | ||
07a93626 | 308 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
79383236 MN |
309 | static void mip6_addr_swap(struct sk_buff *skb) |
310 | { | |
0660e03f | 311 | struct ipv6hdr *iph = ipv6_hdr(skb); |
79383236 MN |
312 | struct inet6_skb_parm *opt = IP6CB(skb); |
313 | struct ipv6_destopt_hao *hao; | |
314 | struct in6_addr tmp; | |
315 | int off; | |
316 | ||
317 | if (opt->dsthao) { | |
318 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); | |
319 | if (likely(off >= 0)) { | |
d56f90a7 ACM |
320 | hao = (struct ipv6_destopt_hao *) |
321 | (skb_network_header(skb) + off); | |
4e3fd7a0 AD |
322 | tmp = iph->saddr; |
323 | iph->saddr = hao->addr; | |
324 | hao->addr = tmp; | |
79383236 MN |
325 | } |
326 | } | |
327 | } | |
328 | #else | |
329 | static inline void mip6_addr_swap(struct sk_buff *skb) {} | |
330 | #endif | |
331 | ||
e8243534 | 332 | static struct dst_entry *icmpv6_route_lookup(struct net *net, |
333 | struct sk_buff *skb, | |
334 | struct sock *sk, | |
335 | struct flowi6 *fl6) | |
b42835db DM |
336 | { |
337 | struct dst_entry *dst, *dst2; | |
4c9483b2 | 338 | struct flowi6 fl2; |
b42835db DM |
339 | int err; |
340 | ||
343d60aa | 341 | err = ip6_dst_lookup(net, sk, &dst, fl6); |
b42835db DM |
342 | if (err) |
343 | return ERR_PTR(err); | |
344 | ||
345 | /* | |
346 | * We won't send icmp if the destination is known | |
347 | * anycast. | |
348 | */ | |
2647a9b0 | 349 | if (ipv6_anycast_destination(dst, &fl6->daddr)) { |
ba7a46f1 | 350 | net_dbg_ratelimited("icmp6_send: acast source\n"); |
b42835db DM |
351 | dst_release(dst); |
352 | return ERR_PTR(-EINVAL); | |
353 | } | |
354 | ||
355 | /* No need to clone since we're just using its address. */ | |
356 | dst2 = dst; | |
357 | ||
4c9483b2 | 358 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); |
452edd59 | 359 | if (!IS_ERR(dst)) { |
b42835db DM |
360 | if (dst != dst2) |
361 | return dst; | |
452edd59 DM |
362 | } else { |
363 | if (PTR_ERR(dst) == -EPERM) | |
364 | dst = NULL; | |
365 | else | |
366 | return dst; | |
b42835db DM |
367 | } |
368 | ||
4c9483b2 | 369 | err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); |
b42835db DM |
370 | if (err) |
371 | goto relookup_failed; | |
372 | ||
343d60aa | 373 | err = ip6_dst_lookup(net, sk, &dst2, &fl2); |
b42835db DM |
374 | if (err) |
375 | goto relookup_failed; | |
376 | ||
4c9483b2 | 377 | dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); |
452edd59 | 378 | if (!IS_ERR(dst2)) { |
b42835db DM |
379 | dst_release(dst); |
380 | dst = dst2; | |
452edd59 DM |
381 | } else { |
382 | err = PTR_ERR(dst2); | |
383 | if (err == -EPERM) { | |
384 | dst_release(dst); | |
385 | return dst2; | |
386 | } else | |
387 | goto relookup_failed; | |
b42835db DM |
388 | } |
389 | ||
390 | relookup_failed: | |
391 | if (dst) | |
392 | return dst; | |
393 | return ERR_PTR(err); | |
394 | } | |
395 | ||
e1ae5c2e | 396 | static struct net_device *icmp6_dev(const struct sk_buff *skb) |
1b70d792 | 397 | { |
e1ae5c2e | 398 | struct net_device *dev = skb->dev; |
1b70d792 DA |
399 | |
400 | /* for local traffic to local address, skb dev is the loopback | |
401 | * device. Check if there is a dst attached to the skb and if so | |
24b711ed DA |
402 | * get the real device index. Same is needed for replies to a link |
403 | * local address on a device enslaved to an L3 master device | |
1b70d792 | 404 | */ |
e1ae5c2e | 405 | if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { |
1b70d792 DA |
406 | const struct rt6_info *rt6 = skb_rt6_info(skb); |
407 | ||
408 | if (rt6) | |
e1ae5c2e | 409 | dev = rt6->rt6i_idev->dev; |
1b70d792 DA |
410 | } |
411 | ||
e1ae5c2e SS |
412 | return dev; |
413 | } | |
414 | ||
415 | static int icmp6_iif(const struct sk_buff *skb) | |
416 | { | |
417 | return icmp6_dev(skb)->ifindex; | |
1b70d792 DA |
418 | } |
419 | ||
1da177e4 LT |
420 | /* |
421 | * Send an ICMP message in response to a packet in error | |
422 | */ | |
b1cadc1a ED |
423 | static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, |
424 | const struct in6_addr *force_saddr) | |
1da177e4 LT |
425 | { |
426 | struct inet6_dev *idev = NULL; | |
0660e03f | 427 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
84427d53 | 428 | struct sock *sk; |
8d933670 | 429 | struct net *net; |
84427d53 | 430 | struct ipv6_pinfo *np; |
b71d1d42 | 431 | const struct in6_addr *saddr = NULL; |
1da177e4 LT |
432 | struct dst_entry *dst; |
433 | struct icmp6hdr tmp_hdr; | |
4c9483b2 | 434 | struct flowi6 fl6; |
1da177e4 | 435 | struct icmpv6_msg msg; |
26879da5 | 436 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
437 | int iif = 0; |
438 | int addr_type = 0; | |
439 | int len; | |
8d933670 | 440 | u32 mark; |
1da177e4 | 441 | |
27a884dc | 442 | if ((u8 *)hdr < skb->head || |
29a3cad5 | 443 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
1da177e4 LT |
444 | return; |
445 | ||
8d933670 ED |
446 | if (!skb->dev) |
447 | return; | |
448 | net = dev_net(skb->dev); | |
449 | mark = IP6_REPLY_MARK(net, skb->mark); | |
1da177e4 | 450 | /* |
1ab1457c | 451 | * Make sure we respect the rules |
1da177e4 | 452 | * i.e. RFC 1885 2.4(e) |
5f5624cf | 453 | * Rule (e.1) is enforced by not using icmp6_send |
1da177e4 LT |
454 | * in any code that processes icmp errors. |
455 | */ | |
456 | addr_type = ipv6_addr_type(&hdr->daddr); | |
457 | ||
446fab59 | 458 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || |
d94c1f92 | 459 | ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) |
1da177e4 LT |
460 | saddr = &hdr->daddr; |
461 | ||
462 | /* | |
463 | * Dest addr check | |
464 | */ | |
465 | ||
9a6b4b39 | 466 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
1da177e4 | 467 | if (type != ICMPV6_PKT_TOOBIG && |
1ab1457c YH |
468 | !(type == ICMPV6_PARAMPROB && |
469 | code == ICMPV6_UNK_OPTION && | |
1da177e4 LT |
470 | (opt_unrec(skb, info)))) |
471 | return; | |
472 | ||
473 | saddr = NULL; | |
474 | } | |
475 | ||
476 | addr_type = ipv6_addr_type(&hdr->saddr); | |
477 | ||
478 | /* | |
479 | * Source addr check | |
480 | */ | |
481 | ||
4832c30d | 482 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
1b70d792 | 483 | iif = icmp6_iif(skb); |
4832c30d | 484 | } else { |
79dc7e3f DA |
485 | dst = skb_dst(skb); |
486 | iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); | |
487 | } | |
1da177e4 LT |
488 | |
489 | /* | |
8de3351e YH |
490 | * Must not send error if the source does not uniquely |
491 | * identify a single node (RFC2463 Section 2.4). | |
492 | * We check unspecified / multicast addresses here, | |
493 | * and anycast addresses will be checked later. | |
1da177e4 LT |
494 | */ |
495 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { | |
4b3418fb BM |
496 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", |
497 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
498 | return; |
499 | } | |
500 | ||
1ab1457c | 501 | /* |
1da177e4 LT |
502 | * Never answer to a ICMP packet. |
503 | */ | |
504 | if (is_ineligible(skb)) { | |
4b3418fb BM |
505 | net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", |
506 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
507 | return; |
508 | } | |
509 | ||
7ba91ecb JDB |
510 | /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ |
511 | local_bh_disable(); | |
512 | ||
513 | /* Check global sysctl_icmp_msgs_per_sec ratelimit */ | |
0bc19985 | 514 | if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) |
7ba91ecb JDB |
515 | goto out_bh_enable; |
516 | ||
79383236 MN |
517 | mip6_addr_swap(skb); |
518 | ||
fac6fce9 FR |
519 | sk = icmpv6_xmit_lock(net); |
520 | if (!sk) | |
521 | goto out_bh_enable; | |
522 | ||
4c9483b2 DM |
523 | memset(&fl6, 0, sizeof(fl6)); |
524 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 525 | fl6.daddr = hdr->saddr; |
b1cadc1a ED |
526 | if (force_saddr) |
527 | saddr = force_saddr; | |
fac6fce9 | 528 | if (saddr) { |
4e3fd7a0 | 529 | fl6.saddr = *saddr; |
fac6fce9 FR |
530 | } else { |
531 | /* select a more meaningful saddr from input if */ | |
532 | struct net_device *in_netdev; | |
533 | ||
534 | in_netdev = dev_get_by_index(net, IP6CB(skb)->iif); | |
535 | if (in_netdev) { | |
536 | ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr, | |
537 | inet6_sk(sk)->srcprefs, | |
538 | &fl6.saddr); | |
539 | dev_put(in_netdev); | |
540 | } | |
541 | } | |
e110861f | 542 | fl6.flowi6_mark = mark; |
4c9483b2 | 543 | fl6.flowi6_oif = iif; |
1958b856 DM |
544 | fl6.fl6_icmp_type = type; |
545 | fl6.fl6_icmp_code = code; | |
e2d118a1 | 546 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
b4bac172 | 547 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); |
4c9483b2 | 548 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 549 | |
e110861f | 550 | sk->sk_mark = mark; |
fdc0bde9 | 551 | np = inet6_sk(sk); |
405666db | 552 | |
4c9483b2 | 553 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
1da177e4 LT |
554 | goto out; |
555 | ||
556 | tmp_hdr.icmp6_type = type; | |
557 | tmp_hdr.icmp6_code = code; | |
558 | tmp_hdr.icmp6_cksum = 0; | |
559 | tmp_hdr.icmp6_pointer = htonl(info); | |
560 | ||
4c9483b2 DM |
561 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
562 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
563 | else if (!fl6.flowi6_oif) |
564 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 565 | |
b515430a | 566 | ipcm6_init_sk(&ipc6, np); |
38b7097b HFS |
567 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
568 | ||
4c9483b2 | 569 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
b42835db | 570 | if (IS_ERR(dst)) |
1da177e4 | 571 | goto out; |
8de3351e | 572 | |
26879da5 | 573 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
1da177e4 LT |
574 | |
575 | msg.skb = skb; | |
bbe735e4 | 576 | msg.offset = skb_network_offset(skb); |
763ecff1 | 577 | msg.type = type; |
1da177e4 LT |
578 | |
579 | len = skb->len - msg.offset; | |
67ba4152 | 580 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
1da177e4 | 581 | if (len < 0) { |
4b3418fb BM |
582 | net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", |
583 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
584 | goto out_dst_release; |
585 | } | |
586 | ||
cfdf7647 ED |
587 | rcu_read_lock(); |
588 | idev = __in6_dev_get(skb->dev); | |
1da177e4 | 589 | |
4e64b1ed JP |
590 | if (ip6_append_data(sk, icmpv6_getfrag, &msg, |
591 | len + sizeof(struct icmp6hdr), | |
592 | sizeof(struct icmp6hdr), | |
593 | &ipc6, &fl6, (struct rt6_info *)dst, | |
5fdaa88d | 594 | MSG_DONTWAIT)) { |
43a43b60 | 595 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 596 | ip6_flush_pending_frames(sk); |
cfdf7647 | 597 | } else { |
4e64b1ed JP |
598 | icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, |
599 | len + sizeof(struct icmp6hdr)); | |
1da177e4 | 600 | } |
cfdf7647 | 601 | rcu_read_unlock(); |
1da177e4 LT |
602 | out_dst_release: |
603 | dst_release(dst); | |
604 | out: | |
405666db | 605 | icmpv6_xmit_unlock(sk); |
7ba91ecb JDB |
606 | out_bh_enable: |
607 | local_bh_enable(); | |
1da177e4 | 608 | } |
5f5624cf PS |
609 | |
610 | /* Slightly more convenient version of icmp6_send. | |
611 | */ | |
612 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) | |
613 | { | |
b1cadc1a | 614 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); |
5f5624cf PS |
615 | kfree_skb(skb); |
616 | } | |
7159039a | 617 | |
5fbba8ac ED |
618 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH |
619 | * if sufficient data bytes are available | |
620 | * @nhs is the size of the tunnel header(s) : | |
621 | * Either an IPv4 header for SIT encap | |
622 | * an IPv4 header + GRE header for GRE encap | |
623 | */ | |
20e1954f ED |
624 | int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, |
625 | unsigned int data_len) | |
5fbba8ac | 626 | { |
2d7a3b27 | 627 | struct in6_addr temp_saddr; |
5fbba8ac ED |
628 | struct rt6_info *rt; |
629 | struct sk_buff *skb2; | |
20e1954f | 630 | u32 info = 0; |
5fbba8ac ED |
631 | |
632 | if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) | |
633 | return 1; | |
634 | ||
20e1954f ED |
635 | /* RFC 4884 (partial) support for ICMP extensions */ |
636 | if (data_len < 128 || (data_len & 7) || skb->len < data_len) | |
637 | data_len = 0; | |
638 | ||
639 | skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); | |
5fbba8ac ED |
640 | |
641 | if (!skb2) | |
642 | return 1; | |
643 | ||
644 | skb_dst_drop(skb2); | |
645 | skb_pull(skb2, nhs); | |
646 | skb_reset_network_header(skb2); | |
647 | ||
b75cc8f9 DA |
648 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, |
649 | skb, 0); | |
5fbba8ac ED |
650 | |
651 | if (rt && rt->dst.dev) | |
652 | skb2->dev = rt->dst.dev; | |
653 | ||
2d7a3b27 | 654 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); |
20e1954f ED |
655 | |
656 | if (data_len) { | |
657 | /* RFC 4884 (partial) support : | |
658 | * insert 0 padding at the end, before the extensions | |
659 | */ | |
660 | __skb_push(skb2, nhs); | |
661 | skb_reset_network_header(skb2); | |
662 | memmove(skb2->data, skb2->data + nhs, data_len - nhs); | |
663 | memset(skb2->data + data_len - nhs, 0, nhs); | |
664 | /* RFC 4884 4.5 : Length is measured in 64-bit words, | |
665 | * and stored in reserved[0] | |
666 | */ | |
667 | info = (data_len/8) << 24; | |
668 | } | |
2d7a3b27 ED |
669 | if (type == ICMP_TIME_EXCEEDED) |
670 | icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
20e1954f | 671 | info, &temp_saddr); |
2d7a3b27 ED |
672 | else |
673 | icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, | |
20e1954f | 674 | info, &temp_saddr); |
5fbba8ac ED |
675 | if (rt) |
676 | ip6_rt_put(rt); | |
677 | ||
678 | kfree_skb(skb2); | |
679 | ||
680 | return 0; | |
681 | } | |
682 | EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); | |
683 | ||
1da177e4 LT |
684 | static void icmpv6_echo_reply(struct sk_buff *skb) |
685 | { | |
c346dca1 | 686 | struct net *net = dev_net(skb->dev); |
84427d53 | 687 | struct sock *sk; |
1da177e4 | 688 | struct inet6_dev *idev; |
84427d53 | 689 | struct ipv6_pinfo *np; |
b71d1d42 | 690 | const struct in6_addr *saddr = NULL; |
cc70ab26 | 691 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 | 692 | struct icmp6hdr tmp_hdr; |
4c9483b2 | 693 | struct flowi6 fl6; |
1da177e4 LT |
694 | struct icmpv6_msg msg; |
695 | struct dst_entry *dst; | |
26879da5 | 696 | struct ipcm6_cookie ipc6; |
e110861f | 697 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
0b03a5ca | 698 | bool acast; |
1da177e4 | 699 | |
03f1eccc SS |
700 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && |
701 | net->ipv6.sysctl.icmpv6_echo_ignore_multicast) | |
702 | return; | |
703 | ||
0660e03f | 704 | saddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 705 | |
0b03a5ca SS |
706 | acast = ipv6_anycast_destination(skb_dst(skb), saddr); |
707 | if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) | |
708 | return; | |
709 | ||
509aba3b | 710 | if (!ipv6_unicast_destination(skb) && |
0b03a5ca | 711 | !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) |
1da177e4 LT |
712 | saddr = NULL; |
713 | ||
714 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); | |
715 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; | |
716 | ||
4c9483b2 | 717 | memset(&fl6, 0, sizeof(fl6)); |
a346abe0 ED |
718 | if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) |
719 | fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); | |
720 | ||
4c9483b2 | 721 | fl6.flowi6_proto = IPPROTO_ICMPV6; |
4e3fd7a0 | 722 | fl6.daddr = ipv6_hdr(skb)->saddr; |
1da177e4 | 723 | if (saddr) |
4e3fd7a0 | 724 | fl6.saddr = *saddr; |
1b70d792 | 725 | fl6.flowi6_oif = icmp6_iif(skb); |
1958b856 | 726 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
e110861f | 727 | fl6.flowi6_mark = mark; |
e2d118a1 | 728 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
4c9483b2 | 729 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 730 | |
7ba91ecb | 731 | local_bh_disable(); |
fdc0bde9 | 732 | sk = icmpv6_xmit_lock(net); |
63159f29 | 733 | if (!sk) |
7ba91ecb | 734 | goto out_bh_enable; |
e110861f | 735 | sk->sk_mark = mark; |
fdc0bde9 | 736 | np = inet6_sk(sk); |
405666db | 737 | |
4c9483b2 DM |
738 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
739 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
740 | else if (!fl6.flowi6_oif) |
741 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 742 | |
4e64b1ed | 743 | if (ip6_dst_lookup(net, sk, &dst, &fl6)) |
1da177e4 | 744 | goto out; |
4c9483b2 | 745 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
452edd59 | 746 | if (IS_ERR(dst)) |
e104411b | 747 | goto out; |
1da177e4 | 748 | |
0bc19985 SS |
749 | /* Check the ratelimit */ |
750 | if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || | |
751 | !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) | |
752 | goto out_dst_release; | |
753 | ||
cfdf7647 | 754 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
755 | |
756 | msg.skb = skb; | |
757 | msg.offset = 0; | |
763ecff1 | 758 | msg.type = ICMPV6_ECHO_REPLY; |
1da177e4 | 759 | |
b515430a | 760 | ipcm6_init_sk(&ipc6, np); |
26879da5 WW |
761 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
762 | ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); | |
26879da5 | 763 | |
4e64b1ed JP |
764 | if (ip6_append_data(sk, icmpv6_getfrag, &msg, |
765 | skb->len + sizeof(struct icmp6hdr), | |
766 | sizeof(struct icmp6hdr), &ipc6, &fl6, | |
5fdaa88d | 767 | (struct rt6_info *)dst, MSG_DONTWAIT)) { |
a16292a0 | 768 | __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 769 | ip6_flush_pending_frames(sk); |
cfdf7647 | 770 | } else { |
4e64b1ed JP |
771 | icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, |
772 | skb->len + sizeof(struct icmp6hdr)); | |
1da177e4 | 773 | } |
0bc19985 | 774 | out_dst_release: |
1da177e4 | 775 | dst_release(dst); |
1ab1457c | 776 | out: |
405666db | 777 | icmpv6_xmit_unlock(sk); |
7ba91ecb JDB |
778 | out_bh_enable: |
779 | local_bh_enable(); | |
1da177e4 LT |
780 | } |
781 | ||
b94f1c09 | 782 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
1da177e4 | 783 | { |
41135cc8 | 784 | const struct inet6_protocol *ipprot; |
1da177e4 | 785 | int inner_offset; |
75f2811c | 786 | __be16 frag_off; |
f9242b6b | 787 | u8 nexthdr; |
7304fe46 | 788 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
789 | |
790 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
7304fe46 | 791 | goto out; |
1da177e4 LT |
792 | |
793 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; | |
794 | if (ipv6_ext_hdr(nexthdr)) { | |
795 | /* now skip over extension headers */ | |
75f2811c JG |
796 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
797 | &nexthdr, &frag_off); | |
67ba4152 | 798 | if (inner_offset < 0) |
7304fe46 | 799 | goto out; |
1da177e4 LT |
800 | } else { |
801 | inner_offset = sizeof(struct ipv6hdr); | |
802 | } | |
803 | ||
804 | /* Checkin header including 8 bytes of inner protocol header. */ | |
805 | if (!pskb_may_pull(skb, inner_offset+8)) | |
7304fe46 | 806 | goto out; |
1da177e4 | 807 | |
1da177e4 LT |
808 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
809 | Without this we will not able f.e. to make source routed | |
810 | pmtu discovery. | |
811 | Corresponding argument (opt) to notifiers is already added. | |
812 | --ANK (980726) | |
813 | */ | |
814 | ||
f9242b6b | 815 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
1da177e4 LT |
816 | if (ipprot && ipprot->err_handler) |
817 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); | |
1da177e4 | 818 | |
69d6da0b | 819 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
7304fe46 DJ |
820 | return; |
821 | ||
822 | out: | |
a16292a0 | 823 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
1da177e4 | 824 | } |
1ab1457c | 825 | |
1da177e4 LT |
826 | /* |
827 | * Handle icmp messages | |
828 | */ | |
829 | ||
e5bbef20 | 830 | static int icmpv6_rcv(struct sk_buff *skb) |
1da177e4 | 831 | { |
e6f86b0f | 832 | struct net *net = dev_net(skb->dev); |
e1ae5c2e | 833 | struct net_device *dev = icmp6_dev(skb); |
1da177e4 | 834 | struct inet6_dev *idev = __in6_dev_get(dev); |
b71d1d42 | 835 | const struct in6_addr *saddr, *daddr; |
1da177e4 | 836 | struct icmp6hdr *hdr; |
d5fdd6ba | 837 | u8 type; |
e3e32170 | 838 | bool success = false; |
1da177e4 | 839 | |
aebcf82c | 840 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
def8b4fa | 841 | struct sec_path *sp = skb_sec_path(skb); |
8b7817f3 HX |
842 | int nh; |
843 | ||
def8b4fa | 844 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
aebcf82c HX |
845 | XFRM_STATE_ICMP)) |
846 | goto drop_no_count; | |
847 | ||
81aded24 | 848 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
8b7817f3 HX |
849 | goto drop_no_count; |
850 | ||
851 | nh = skb_network_offset(skb); | |
852 | skb_set_network_header(skb, sizeof(*hdr)); | |
853 | ||
854 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
855 | goto drop_no_count; | |
856 | ||
857 | skb_set_network_header(skb, nh); | |
858 | } | |
859 | ||
a16292a0 | 860 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
1da177e4 | 861 | |
0660e03f ACM |
862 | saddr = &ipv6_hdr(skb)->saddr; |
863 | daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 864 | |
39471ac8 | 865 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
ba7a46f1 JP |
866 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
867 | saddr, daddr); | |
39471ac8 | 868 | goto csum_error; |
1da177e4 LT |
869 | } |
870 | ||
8cf22943 HX |
871 | if (!pskb_pull(skb, sizeof(*hdr))) |
872 | goto discard_it; | |
1da177e4 | 873 | |
cc70ab26 | 874 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
875 | |
876 | type = hdr->icmp6_type; | |
877 | ||
f3832ed2 | 878 | ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); |
1da177e4 LT |
879 | |
880 | switch (type) { | |
881 | case ICMPV6_ECHO_REQUEST: | |
e6f86b0f VJ |
882 | if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) |
883 | icmpv6_echo_reply(skb); | |
1da177e4 LT |
884 | break; |
885 | ||
886 | case ICMPV6_ECHO_REPLY: | |
e3e32170 | 887 | success = ping_rcv(skb); |
1da177e4 LT |
888 | break; |
889 | ||
890 | case ICMPV6_PKT_TOOBIG: | |
891 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update | |
892 | standard destination cache. Seems, only "advanced" | |
893 | destination cache will allow to solve this problem | |
894 | --ANK (980726) | |
895 | */ | |
896 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
897 | goto discard_it; | |
cc70ab26 | 898 | hdr = icmp6_hdr(skb); |
1da177e4 | 899 | |
275757e6 | 900 | /* to notify */ |
a8eceea8 | 901 | fallthrough; |
1da177e4 LT |
902 | case ICMPV6_DEST_UNREACH: |
903 | case ICMPV6_TIME_EXCEED: | |
904 | case ICMPV6_PARAMPROB: | |
905 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
906 | break; | |
907 | ||
908 | case NDISC_ROUTER_SOLICITATION: | |
909 | case NDISC_ROUTER_ADVERTISEMENT: | |
910 | case NDISC_NEIGHBOUR_SOLICITATION: | |
911 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
912 | case NDISC_REDIRECT: | |
913 | ndisc_rcv(skb); | |
914 | break; | |
915 | ||
916 | case ICMPV6_MGM_QUERY: | |
917 | igmp6_event_query(skb); | |
918 | break; | |
919 | ||
920 | case ICMPV6_MGM_REPORT: | |
921 | igmp6_event_report(skb); | |
922 | break; | |
923 | ||
924 | case ICMPV6_MGM_REDUCTION: | |
925 | case ICMPV6_NI_QUERY: | |
926 | case ICMPV6_NI_REPLY: | |
927 | case ICMPV6_MLD2_REPORT: | |
928 | case ICMPV6_DHAAD_REQUEST: | |
929 | case ICMPV6_DHAAD_REPLY: | |
930 | case ICMPV6_MOBILE_PREFIX_SOL: | |
931 | case ICMPV6_MOBILE_PREFIX_ADV: | |
932 | break; | |
933 | ||
934 | default: | |
1da177e4 LT |
935 | /* informational */ |
936 | if (type & ICMPV6_INFOMSG_MASK) | |
937 | break; | |
938 | ||
4b3418fb BM |
939 | net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", |
940 | saddr, daddr); | |
ea85a0a2 | 941 | |
1ab1457c YH |
942 | /* |
943 | * error of unknown type. | |
944 | * must pass to upper level | |
1da177e4 LT |
945 | */ |
946 | ||
947 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
3ff50b79 SH |
948 | } |
949 | ||
e3e32170 RJ |
950 | /* until the v6 path can be better sorted assume failure and |
951 | * preserve the status quo behaviour for the rest of the paths to here | |
952 | */ | |
953 | if (success) | |
954 | consume_skb(skb); | |
955 | else | |
956 | kfree_skb(skb); | |
957 | ||
1da177e4 LT |
958 | return 0; |
959 | ||
6a5dc9e5 | 960 | csum_error: |
a16292a0 | 961 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); |
1da177e4 | 962 | discard_it: |
a16292a0 | 963 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
8b7817f3 | 964 | drop_no_count: |
1da177e4 LT |
965 | kfree_skb(skb); |
966 | return 0; | |
967 | } | |
968 | ||
4c9483b2 | 969 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
95e41e93 YH |
970 | u8 type, |
971 | const struct in6_addr *saddr, | |
972 | const struct in6_addr *daddr, | |
973 | int oif) | |
974 | { | |
4c9483b2 | 975 | memset(fl6, 0, sizeof(*fl6)); |
4e3fd7a0 AD |
976 | fl6->saddr = *saddr; |
977 | fl6->daddr = *daddr; | |
67ba4152 | 978 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1958b856 DM |
979 | fl6->fl6_icmp_type = type; |
980 | fl6->fl6_icmp_code = 0; | |
4c9483b2 DM |
981 | fl6->flowi6_oif = oif; |
982 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
95e41e93 YH |
983 | } |
984 | ||
3232a1ef KW |
985 | static void __net_exit icmpv6_sk_exit(struct net *net) |
986 | { | |
987 | int i; | |
988 | ||
989 | for_each_possible_cpu(i) | |
75efc250 KW |
990 | inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i)); |
991 | free_percpu(net->ipv6.icmp_sk); | |
3232a1ef KW |
992 | } |
993 | ||
98c6d1b2 | 994 | static int __net_init icmpv6_sk_init(struct net *net) |
1da177e4 LT |
995 | { |
996 | struct sock *sk; | |
3232a1ef | 997 | int err, i; |
1da177e4 | 998 | |
75efc250 | 999 | net->ipv6.icmp_sk = alloc_percpu(struct sock *); |
63159f29 | 1000 | if (!net->ipv6.icmp_sk) |
79c91159 DL |
1001 | return -ENOMEM; |
1002 | ||
6f912042 | 1003 | for_each_possible_cpu(i) { |
1ed8516f DL |
1004 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1005 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1006 | if (err < 0) { |
f3213831 | 1007 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
1da177e4 LT |
1008 | err); |
1009 | goto fail; | |
1010 | } | |
1011 | ||
75efc250 | 1012 | *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk; |
5c8cafd6 | 1013 | |
1da177e4 LT |
1014 | /* Enough space for 2 64K ICMP packets, including |
1015 | * sk_buff struct overhead. | |
1016 | */ | |
87fb4b7b | 1017 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1da177e4 | 1018 | } |
1da177e4 LT |
1019 | return 0; |
1020 | ||
1021 | fail: | |
3232a1ef | 1022 | icmpv6_sk_exit(net); |
1da177e4 LT |
1023 | return err; |
1024 | } | |
1025 | ||
8ed7edce | 1026 | static struct pernet_operations icmpv6_sk_ops = { |
67ba4152 IM |
1027 | .init = icmpv6_sk_init, |
1028 | .exit = icmpv6_sk_exit, | |
98c6d1b2 DL |
1029 | }; |
1030 | ||
1031 | int __init icmpv6_init(void) | |
1032 | { | |
1033 | int err; | |
1034 | ||
1035 | err = register_pernet_subsys(&icmpv6_sk_ops); | |
1036 | if (err < 0) | |
1037 | return err; | |
1038 | ||
1039 | err = -EAGAIN; | |
1040 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) | |
1041 | goto fail; | |
5f5624cf PS |
1042 | |
1043 | err = inet6_register_icmp_sender(icmp6_send); | |
1044 | if (err) | |
1045 | goto sender_reg_err; | |
98c6d1b2 DL |
1046 | return 0; |
1047 | ||
5f5624cf PS |
1048 | sender_reg_err: |
1049 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); | |
98c6d1b2 | 1050 | fail: |
f3213831 | 1051 | pr_err("Failed to register ICMP6 protocol\n"); |
98c6d1b2 DL |
1052 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1053 | return err; | |
1054 | } | |
1055 | ||
8ed7edce | 1056 | void icmpv6_cleanup(void) |
98c6d1b2 | 1057 | { |
5f5624cf | 1058 | inet6_unregister_icmp_sender(icmp6_send); |
98c6d1b2 | 1059 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1da177e4 LT |
1060 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
1061 | } | |
1062 | ||
98c6d1b2 | 1063 | |
9b5b5cff | 1064 | static const struct icmp6_err { |
1da177e4 LT |
1065 | int err; |
1066 | int fatal; | |
1067 | } tab_unreach[] = { | |
1068 | { /* NOROUTE */ | |
1069 | .err = ENETUNREACH, | |
1070 | .fatal = 0, | |
1071 | }, | |
1072 | { /* ADM_PROHIBITED */ | |
1073 | .err = EACCES, | |
1074 | .fatal = 1, | |
1075 | }, | |
1076 | { /* Was NOT_NEIGHBOUR, now reserved */ | |
1077 | .err = EHOSTUNREACH, | |
1078 | .fatal = 0, | |
1079 | }, | |
1080 | { /* ADDR_UNREACH */ | |
1081 | .err = EHOSTUNREACH, | |
1082 | .fatal = 0, | |
1083 | }, | |
1084 | { /* PORT_UNREACH */ | |
1085 | .err = ECONNREFUSED, | |
1086 | .fatal = 1, | |
1087 | }, | |
61e76b17 JB |
1088 | { /* POLICY_FAIL */ |
1089 | .err = EACCES, | |
1090 | .fatal = 1, | |
1091 | }, | |
1092 | { /* REJECT_ROUTE */ | |
1093 | .err = EACCES, | |
1094 | .fatal = 1, | |
1095 | }, | |
1da177e4 LT |
1096 | }; |
1097 | ||
d5fdd6ba | 1098 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1da177e4 LT |
1099 | { |
1100 | int fatal = 0; | |
1101 | ||
1102 | *err = EPROTO; | |
1103 | ||
1104 | switch (type) { | |
1105 | case ICMPV6_DEST_UNREACH: | |
1106 | fatal = 1; | |
61e76b17 | 1107 | if (code < ARRAY_SIZE(tab_unreach)) { |
1da177e4 LT |
1108 | *err = tab_unreach[code].err; |
1109 | fatal = tab_unreach[code].fatal; | |
1110 | } | |
1111 | break; | |
1112 | ||
1113 | case ICMPV6_PKT_TOOBIG: | |
1114 | *err = EMSGSIZE; | |
1115 | break; | |
1ab1457c | 1116 | |
1da177e4 LT |
1117 | case ICMPV6_PARAMPROB: |
1118 | *err = EPROTO; | |
1119 | fatal = 1; | |
1120 | break; | |
1121 | ||
1122 | case ICMPV6_TIME_EXCEED: | |
1123 | *err = EHOSTUNREACH; | |
1124 | break; | |
3ff50b79 | 1125 | } |
1da177e4 LT |
1126 | |
1127 | return fatal; | |
1128 | } | |
7159039a YH |
1129 | EXPORT_SYMBOL(icmpv6_err_convert); |
1130 | ||
1da177e4 | 1131 | #ifdef CONFIG_SYSCTL |
e8243534 | 1132 | static struct ctl_table ipv6_icmp_table_template[] = { |
1da177e4 | 1133 | { |
1da177e4 | 1134 | .procname = "ratelimit", |
41a76906 | 1135 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1da177e4 LT |
1136 | .maxlen = sizeof(int), |
1137 | .mode = 0644, | |
6d9f239a | 1138 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 1139 | }, |
e6f86b0f VJ |
1140 | { |
1141 | .procname = "echo_ignore_all", | |
1142 | .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, | |
1143 | .maxlen = sizeof(int), | |
1144 | .mode = 0644, | |
1145 | .proc_handler = proc_dointvec, | |
1146 | }, | |
03f1eccc SS |
1147 | { |
1148 | .procname = "echo_ignore_multicast", | |
1149 | .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, | |
1150 | .maxlen = sizeof(int), | |
1151 | .mode = 0644, | |
1152 | .proc_handler = proc_dointvec, | |
1153 | }, | |
0b03a5ca SS |
1154 | { |
1155 | .procname = "echo_ignore_anycast", | |
1156 | .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, | |
1157 | .maxlen = sizeof(int), | |
1158 | .mode = 0644, | |
1159 | .proc_handler = proc_dointvec, | |
1160 | }, | |
0bc19985 SS |
1161 | { |
1162 | .procname = "ratemask", | |
1163 | .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, | |
1164 | .maxlen = ICMPV6_MSG_MAX + 1, | |
1165 | .mode = 0644, | |
1166 | .proc_handler = proc_do_large_bitmap, | |
1167 | }, | |
f8572d8f | 1168 | { }, |
1da177e4 | 1169 | }; |
760f2d01 | 1170 | |
2c8c1e72 | 1171 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
760f2d01 DL |
1172 | { |
1173 | struct ctl_table *table; | |
1174 | ||
1175 | table = kmemdup(ipv6_icmp_table_template, | |
1176 | sizeof(ipv6_icmp_table_template), | |
1177 | GFP_KERNEL); | |
5ee09105 | 1178 | |
e6f86b0f | 1179 | if (table) { |
5ee09105 | 1180 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
e6f86b0f | 1181 | table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; |
03f1eccc | 1182 | table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; |
0b03a5ca | 1183 | table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; |
0bc19985 | 1184 | table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; |
e6f86b0f | 1185 | } |
760f2d01 DL |
1186 | return table; |
1187 | } | |
1da177e4 | 1188 | #endif |