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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Internet Control Message Protocol (ICMPv6) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * | |
1da177e4 LT |
8 | * Based on net/ipv4/icmp.c |
9 | * | |
10 | * RFC 1885 | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
21 | * Andi Kleen : exception handling | |
22 | * Andi Kleen add rate limits. never reply to a icmp. | |
23 | * add more length checks and other fixes. | |
24 | * yoshfuji : ensure to sent parameter problem for | |
25 | * fragments. | |
26 | * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. | |
27 | * Randy Dunlap and | |
28 | * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support | |
29 | * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data | |
30 | */ | |
31 | ||
f3213831 JP |
32 | #define pr_fmt(fmt) "IPv6: " fmt |
33 | ||
1da177e4 LT |
34 | #include <linux/module.h> |
35 | #include <linux/errno.h> | |
36 | #include <linux/types.h> | |
37 | #include <linux/socket.h> | |
38 | #include <linux/in.h> | |
39 | #include <linux/kernel.h> | |
1da177e4 LT |
40 | #include <linux/sockios.h> |
41 | #include <linux/net.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <linux/init.h> | |
763ecff1 | 44 | #include <linux/netfilter.h> |
5a0e3ad6 | 45 | #include <linux/slab.h> |
1da177e4 LT |
46 | |
47 | #ifdef CONFIG_SYSCTL | |
48 | #include <linux/sysctl.h> | |
49 | #endif | |
50 | ||
51 | #include <linux/inet.h> | |
52 | #include <linux/netdevice.h> | |
53 | #include <linux/icmpv6.h> | |
54 | ||
55 | #include <net/ip.h> | |
56 | #include <net/sock.h> | |
57 | ||
58 | #include <net/ipv6.h> | |
59 | #include <net/ip6_checksum.h> | |
6d0bfe22 | 60 | #include <net/ping.h> |
1da177e4 LT |
61 | #include <net/protocol.h> |
62 | #include <net/raw.h> | |
63 | #include <net/rawv6.h> | |
64 | #include <net/transp_v6.h> | |
65 | #include <net/ip6_route.h> | |
66 | #include <net/addrconf.h> | |
67 | #include <net/icmp.h> | |
8b7817f3 | 68 | #include <net/xfrm.h> |
1ed8516f | 69 | #include <net/inet_common.h> |
825edac4 | 70 | #include <net/dsfield.h> |
ca254490 | 71 | #include <net/l3mdev.h> |
1da177e4 | 72 | |
7c0f6ba6 | 73 | #include <linux/uaccess.h> |
1da177e4 | 74 | |
1da177e4 LT |
75 | /* |
76 | * The ICMP socket(s). This is the most convenient way to flow control | |
77 | * our ICMP output as well as maintain a clean interface throughout | |
78 | * all layers. All Socketless IP sends will soon be gone. | |
79 | * | |
80 | * On SMP we have one ICMP socket per-cpu. | |
81 | */ | |
98c6d1b2 DL |
82 | static inline struct sock *icmpv6_sk(struct net *net) |
83 | { | |
84 | return net->ipv6.icmp_sk[smp_processor_id()]; | |
85 | } | |
1da177e4 | 86 | |
6f809da2 SK |
87 | static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
88 | u8 type, u8 code, int offset, __be32 info) | |
89 | { | |
6d0bfe22 LC |
90 | /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ |
91 | struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); | |
6f809da2 SK |
92 | struct net *net = dev_net(skb->dev); |
93 | ||
94 | if (type == ICMPV6_PKT_TOOBIG) | |
e2d118a1 | 95 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
6f809da2 | 96 | else if (type == NDISC_REDIRECT) |
e2d118a1 LC |
97 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
98 | sock_net_uid(net, NULL)); | |
6d0bfe22 LC |
99 | |
100 | if (!(type & ICMPV6_INFOMSG_MASK)) | |
101 | if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) | |
dcb94b88 | 102 | ping_err(skb, offset, ntohl(info)); |
6f809da2 SK |
103 | } |
104 | ||
e5bbef20 | 105 | static int icmpv6_rcv(struct sk_buff *skb); |
1da177e4 | 106 | |
41135cc8 | 107 | static const struct inet6_protocol icmpv6_protocol = { |
1da177e4 | 108 | .handler = icmpv6_rcv, |
6f809da2 | 109 | .err_handler = icmpv6_err, |
8b7817f3 | 110 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1da177e4 LT |
111 | }; |
112 | ||
7ba91ecb | 113 | /* Called with BH disabled */ |
fdc0bde9 | 114 | static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) |
1da177e4 | 115 | { |
fdc0bde9 DL |
116 | struct sock *sk; |
117 | ||
fdc0bde9 | 118 | sk = icmpv6_sk(net); |
405666db | 119 | if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { |
1da177e4 LT |
120 | /* This can happen if the output path (f.e. SIT or |
121 | * ip6ip6 tunnel) signals dst_link_failure() for an | |
122 | * outgoing ICMP6 packet. | |
123 | */ | |
fdc0bde9 | 124 | return NULL; |
1da177e4 | 125 | } |
fdc0bde9 | 126 | return sk; |
1da177e4 LT |
127 | } |
128 | ||
405666db | 129 | static __inline__ void icmpv6_xmit_unlock(struct sock *sk) |
1da177e4 | 130 | { |
7ba91ecb | 131 | spin_unlock(&sk->sk_lock.slock); |
1da177e4 LT |
132 | } |
133 | ||
1da177e4 LT |
134 | /* |
135 | * Figure out, may we reply to this packet with icmp error. | |
136 | * | |
137 | * We do not reply, if: | |
138 | * - it was icmp error message. | |
139 | * - it is truncated, so that it is known, that protocol is ICMPV6 | |
140 | * (i.e. in the middle of some exthdr) | |
141 | * | |
142 | * --ANK (980726) | |
143 | */ | |
144 | ||
a50feda5 | 145 | static bool is_ineligible(const struct sk_buff *skb) |
1da177e4 | 146 | { |
0660e03f | 147 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
1da177e4 | 148 | int len = skb->len - ptr; |
0660e03f | 149 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
75f2811c | 150 | __be16 frag_off; |
1da177e4 LT |
151 | |
152 | if (len < 0) | |
a50feda5 | 153 | return true; |
1da177e4 | 154 | |
75f2811c | 155 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); |
1da177e4 | 156 | if (ptr < 0) |
a50feda5 | 157 | return false; |
1da177e4 LT |
158 | if (nexthdr == IPPROTO_ICMPV6) { |
159 | u8 _type, *tp; | |
160 | tp = skb_header_pointer(skb, | |
161 | ptr+offsetof(struct icmp6hdr, icmp6_type), | |
162 | sizeof(_type), &_type); | |
63159f29 | 163 | if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) |
a50feda5 | 164 | return true; |
1da177e4 | 165 | } |
a50feda5 | 166 | return false; |
1da177e4 LT |
167 | } |
168 | ||
c0303efe JDB |
169 | static bool icmpv6_mask_allow(int type) |
170 | { | |
171 | /* Informational messages are not limited. */ | |
172 | if (type & ICMPV6_INFOMSG_MASK) | |
173 | return true; | |
174 | ||
175 | /* Do not limit pmtu discovery, it would break it. */ | |
176 | if (type == ICMPV6_PKT_TOOBIG) | |
177 | return true; | |
178 | ||
179 | return false; | |
180 | } | |
181 | ||
182 | static bool icmpv6_global_allow(int type) | |
183 | { | |
184 | if (icmpv6_mask_allow(type)) | |
185 | return true; | |
186 | ||
187 | if (icmp_global_allow()) | |
188 | return true; | |
189 | ||
190 | return false; | |
191 | } | |
192 | ||
1ab1457c YH |
193 | /* |
194 | * Check the ICMP output rate limit | |
1da177e4 | 195 | */ |
4cdf507d ED |
196 | static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, |
197 | struct flowi6 *fl6) | |
1da177e4 | 198 | { |
3b1e0a65 | 199 | struct net *net = sock_net(sk); |
4cdf507d | 200 | struct dst_entry *dst; |
92d86829 | 201 | bool res = false; |
1da177e4 | 202 | |
c0303efe | 203 | if (icmpv6_mask_allow(type)) |
92d86829 | 204 | return true; |
1da177e4 | 205 | |
1ab1457c | 206 | /* |
1da177e4 LT |
207 | * Look up the output route. |
208 | * XXX: perhaps the expire for routing entries cloned by | |
209 | * this lookup should be more aggressive (not longer than timeout). | |
210 | */ | |
4c9483b2 | 211 | dst = ip6_route_output(net, sk, fl6); |
1da177e4 | 212 | if (dst->error) { |
3bd653c8 | 213 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
a11d206d | 214 | IPSTATS_MIB_OUTNOROUTES); |
1da177e4 | 215 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
92d86829 | 216 | res = true; |
1da177e4 LT |
217 | } else { |
218 | struct rt6_info *rt = (struct rt6_info *)dst; | |
9a43b709 | 219 | int tmo = net->ipv6.sysctl.icmpv6_time; |
c0303efe | 220 | struct inet_peer *peer; |
1da177e4 LT |
221 | |
222 | /* Give more bandwidth to wider prefixes. */ | |
223 | if (rt->rt6i_dst.plen < 128) | |
224 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); | |
225 | ||
c0303efe JDB |
226 | peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); |
227 | res = inet_peer_xrlim_allow(peer, tmo); | |
228 | if (peer) | |
229 | inet_putpeer(peer); | |
1da177e4 LT |
230 | } |
231 | dst_release(dst); | |
232 | return res; | |
233 | } | |
234 | ||
235 | /* | |
236 | * an inline helper for the "simple" if statement below | |
237 | * checks if parameter problem report is caused by an | |
1ab1457c | 238 | * unrecognized IPv6 option that has the Option Type |
1da177e4 LT |
239 | * highest-order two bits set to 10 |
240 | */ | |
241 | ||
a50feda5 | 242 | static bool opt_unrec(struct sk_buff *skb, __u32 offset) |
1da177e4 LT |
243 | { |
244 | u8 _optval, *op; | |
245 | ||
bbe735e4 | 246 | offset += skb_network_offset(skb); |
1da177e4 | 247 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
63159f29 | 248 | if (!op) |
a50feda5 | 249 | return true; |
1da177e4 LT |
250 | return (*op & 0xC0) == 0x80; |
251 | } | |
252 | ||
4e64b1ed JP |
253 | void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
254 | struct icmp6hdr *thdr, int len) | |
1da177e4 LT |
255 | { |
256 | struct sk_buff *skb; | |
257 | struct icmp6hdr *icmp6h; | |
1da177e4 | 258 | |
e5d08d71 | 259 | skb = skb_peek(&sk->sk_write_queue); |
63159f29 | 260 | if (!skb) |
4e64b1ed | 261 | return; |
1da177e4 | 262 | |
cc70ab26 | 263 | icmp6h = icmp6_hdr(skb); |
1da177e4 LT |
264 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
265 | icmp6h->icmp6_cksum = 0; | |
266 | ||
267 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
07f0757a | 268 | skb->csum = csum_partial(icmp6h, |
1da177e4 | 269 | sizeof(struct icmp6hdr), skb->csum); |
4c9483b2 DM |
270 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
271 | &fl6->daddr, | |
272 | len, fl6->flowi6_proto, | |
1da177e4 LT |
273 | skb->csum); |
274 | } else { | |
868c86bc | 275 | __wsum tmp_csum = 0; |
1da177e4 LT |
276 | |
277 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
278 | tmp_csum = csum_add(tmp_csum, skb->csum); | |
279 | } | |
280 | ||
07f0757a | 281 | tmp_csum = csum_partial(icmp6h, |
1da177e4 | 282 | sizeof(struct icmp6hdr), tmp_csum); |
4c9483b2 DM |
283 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
284 | &fl6->daddr, | |
285 | len, fl6->flowi6_proto, | |
868c86bc | 286 | tmp_csum); |
1da177e4 | 287 | } |
1da177e4 | 288 | ip6_push_pending_frames(sk); |
1da177e4 LT |
289 | } |
290 | ||
291 | struct icmpv6_msg { | |
292 | struct sk_buff *skb; | |
293 | int offset; | |
763ecff1 | 294 | uint8_t type; |
1da177e4 LT |
295 | }; |
296 | ||
297 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) | |
298 | { | |
299 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; | |
300 | struct sk_buff *org_skb = msg->skb; | |
5f92a738 | 301 | __wsum csum = 0; |
1da177e4 LT |
302 | |
303 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, | |
304 | to, len, csum); | |
305 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
763ecff1 YK |
306 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
307 | nf_ct_attach(skb, org_skb); | |
1da177e4 LT |
308 | return 0; |
309 | } | |
310 | ||
07a93626 | 311 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
79383236 MN |
312 | static void mip6_addr_swap(struct sk_buff *skb) |
313 | { | |
0660e03f | 314 | struct ipv6hdr *iph = ipv6_hdr(skb); |
79383236 MN |
315 | struct inet6_skb_parm *opt = IP6CB(skb); |
316 | struct ipv6_destopt_hao *hao; | |
317 | struct in6_addr tmp; | |
318 | int off; | |
319 | ||
320 | if (opt->dsthao) { | |
321 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); | |
322 | if (likely(off >= 0)) { | |
d56f90a7 ACM |
323 | hao = (struct ipv6_destopt_hao *) |
324 | (skb_network_header(skb) + off); | |
4e3fd7a0 AD |
325 | tmp = iph->saddr; |
326 | iph->saddr = hao->addr; | |
327 | hao->addr = tmp; | |
79383236 MN |
328 | } |
329 | } | |
330 | } | |
331 | #else | |
332 | static inline void mip6_addr_swap(struct sk_buff *skb) {} | |
333 | #endif | |
334 | ||
e8243534 | 335 | static struct dst_entry *icmpv6_route_lookup(struct net *net, |
336 | struct sk_buff *skb, | |
337 | struct sock *sk, | |
338 | struct flowi6 *fl6) | |
b42835db DM |
339 | { |
340 | struct dst_entry *dst, *dst2; | |
4c9483b2 | 341 | struct flowi6 fl2; |
b42835db DM |
342 | int err; |
343 | ||
343d60aa | 344 | err = ip6_dst_lookup(net, sk, &dst, fl6); |
b42835db DM |
345 | if (err) |
346 | return ERR_PTR(err); | |
347 | ||
348 | /* | |
349 | * We won't send icmp if the destination is known | |
350 | * anycast. | |
351 | */ | |
2647a9b0 | 352 | if (ipv6_anycast_destination(dst, &fl6->daddr)) { |
ba7a46f1 | 353 | net_dbg_ratelimited("icmp6_send: acast source\n"); |
b42835db DM |
354 | dst_release(dst); |
355 | return ERR_PTR(-EINVAL); | |
356 | } | |
357 | ||
358 | /* No need to clone since we're just using its address. */ | |
359 | dst2 = dst; | |
360 | ||
4c9483b2 | 361 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); |
452edd59 | 362 | if (!IS_ERR(dst)) { |
b42835db DM |
363 | if (dst != dst2) |
364 | return dst; | |
452edd59 DM |
365 | } else { |
366 | if (PTR_ERR(dst) == -EPERM) | |
367 | dst = NULL; | |
368 | else | |
369 | return dst; | |
b42835db DM |
370 | } |
371 | ||
4c9483b2 | 372 | err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); |
b42835db DM |
373 | if (err) |
374 | goto relookup_failed; | |
375 | ||
343d60aa | 376 | err = ip6_dst_lookup(net, sk, &dst2, &fl2); |
b42835db DM |
377 | if (err) |
378 | goto relookup_failed; | |
379 | ||
4c9483b2 | 380 | dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); |
452edd59 | 381 | if (!IS_ERR(dst2)) { |
b42835db DM |
382 | dst_release(dst); |
383 | dst = dst2; | |
452edd59 DM |
384 | } else { |
385 | err = PTR_ERR(dst2); | |
386 | if (err == -EPERM) { | |
387 | dst_release(dst); | |
388 | return dst2; | |
389 | } else | |
390 | goto relookup_failed; | |
b42835db DM |
391 | } |
392 | ||
393 | relookup_failed: | |
394 | if (dst) | |
395 | return dst; | |
396 | return ERR_PTR(err); | |
397 | } | |
398 | ||
1b70d792 DA |
399 | static int icmp6_iif(const struct sk_buff *skb) |
400 | { | |
401 | int iif = skb->dev->ifindex; | |
402 | ||
403 | /* for local traffic to local address, skb dev is the loopback | |
404 | * device. Check if there is a dst attached to the skb and if so | |
2beb8c20 DA |
405 | * get the real device index. Same is needed for replies to a link |
406 | * local address on a device enslaved to an L3 master device | |
1b70d792 | 407 | */ |
2beb8c20 | 408 | if (unlikely(iif == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { |
1b70d792 DA |
409 | const struct rt6_info *rt6 = skb_rt6_info(skb); |
410 | ||
411 | if (rt6) | |
412 | iif = rt6->rt6i_idev->dev->ifindex; | |
413 | } | |
414 | ||
415 | return iif; | |
416 | } | |
417 | ||
1da177e4 LT |
418 | /* |
419 | * Send an ICMP message in response to a packet in error | |
420 | */ | |
b1cadc1a ED |
421 | static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, |
422 | const struct in6_addr *force_saddr) | |
1da177e4 | 423 | { |
c346dca1 | 424 | struct net *net = dev_net(skb->dev); |
1da177e4 | 425 | struct inet6_dev *idev = NULL; |
0660e03f | 426 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
84427d53 YH |
427 | struct sock *sk; |
428 | struct ipv6_pinfo *np; | |
b71d1d42 | 429 | const struct in6_addr *saddr = NULL; |
1da177e4 LT |
430 | struct dst_entry *dst; |
431 | struct icmp6hdr tmp_hdr; | |
4c9483b2 | 432 | struct flowi6 fl6; |
1da177e4 | 433 | struct icmpv6_msg msg; |
c14ac945 | 434 | struct sockcm_cookie sockc_unused = {0}; |
26879da5 | 435 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
436 | int iif = 0; |
437 | int addr_type = 0; | |
438 | int len; | |
e110861f | 439 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 440 | |
27a884dc | 441 | if ((u8 *)hdr < skb->head || |
29a3cad5 | 442 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
1da177e4 LT |
443 | return; |
444 | ||
445 | /* | |
1ab1457c | 446 | * Make sure we respect the rules |
1da177e4 | 447 | * i.e. RFC 1885 2.4(e) |
5f5624cf | 448 | * Rule (e.1) is enforced by not using icmp6_send |
1da177e4 LT |
449 | * in any code that processes icmp errors. |
450 | */ | |
451 | addr_type = ipv6_addr_type(&hdr->daddr); | |
452 | ||
446fab59 | 453 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || |
d94c1f92 | 454 | ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) |
1da177e4 LT |
455 | saddr = &hdr->daddr; |
456 | ||
457 | /* | |
458 | * Dest addr check | |
459 | */ | |
460 | ||
9a6b4b39 | 461 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
1da177e4 | 462 | if (type != ICMPV6_PKT_TOOBIG && |
1ab1457c YH |
463 | !(type == ICMPV6_PARAMPROB && |
464 | code == ICMPV6_UNK_OPTION && | |
1da177e4 LT |
465 | (opt_unrec(skb, info)))) |
466 | return; | |
467 | ||
468 | saddr = NULL; | |
469 | } | |
470 | ||
471 | addr_type = ipv6_addr_type(&hdr->saddr); | |
472 | ||
473 | /* | |
474 | * Source addr check | |
475 | */ | |
476 | ||
4832c30d | 477 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
1b70d792 | 478 | iif = icmp6_iif(skb); |
4832c30d | 479 | } else { |
79dc7e3f DA |
480 | dst = skb_dst(skb); |
481 | iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); | |
482 | } | |
1da177e4 LT |
483 | |
484 | /* | |
8de3351e YH |
485 | * Must not send error if the source does not uniquely |
486 | * identify a single node (RFC2463 Section 2.4). | |
487 | * We check unspecified / multicast addresses here, | |
488 | * and anycast addresses will be checked later. | |
1da177e4 LT |
489 | */ |
490 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { | |
4b3418fb BM |
491 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", |
492 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
493 | return; |
494 | } | |
495 | ||
1ab1457c | 496 | /* |
1da177e4 LT |
497 | * Never answer to a ICMP packet. |
498 | */ | |
499 | if (is_ineligible(skb)) { | |
4b3418fb BM |
500 | net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", |
501 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
502 | return; |
503 | } | |
504 | ||
7ba91ecb JDB |
505 | /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ |
506 | local_bh_disable(); | |
507 | ||
508 | /* Check global sysctl_icmp_msgs_per_sec ratelimit */ | |
849a44de | 509 | if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(type)) |
7ba91ecb JDB |
510 | goto out_bh_enable; |
511 | ||
79383236 MN |
512 | mip6_addr_swap(skb); |
513 | ||
4c9483b2 DM |
514 | memset(&fl6, 0, sizeof(fl6)); |
515 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 516 | fl6.daddr = hdr->saddr; |
b1cadc1a ED |
517 | if (force_saddr) |
518 | saddr = force_saddr; | |
1da177e4 | 519 | if (saddr) |
4e3fd7a0 | 520 | fl6.saddr = *saddr; |
e110861f | 521 | fl6.flowi6_mark = mark; |
4c9483b2 | 522 | fl6.flowi6_oif = iif; |
1958b856 DM |
523 | fl6.fl6_icmp_type = type; |
524 | fl6.fl6_icmp_code = code; | |
e2d118a1 | 525 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
23aebdac | 526 | fl6.mp_hash = rt6_multipath_hash(&fl6, skb); |
4c9483b2 | 527 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 528 | |
fdc0bde9 | 529 | sk = icmpv6_xmit_lock(net); |
63159f29 | 530 | if (!sk) |
7ba91ecb | 531 | goto out_bh_enable; |
c0303efe | 532 | |
e110861f | 533 | sk->sk_mark = mark; |
fdc0bde9 | 534 | np = inet6_sk(sk); |
405666db | 535 | |
4c9483b2 | 536 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
1da177e4 LT |
537 | goto out; |
538 | ||
539 | tmp_hdr.icmp6_type = type; | |
540 | tmp_hdr.icmp6_code = code; | |
541 | tmp_hdr.icmp6_cksum = 0; | |
542 | tmp_hdr.icmp6_pointer = htonl(info); | |
543 | ||
4c9483b2 DM |
544 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
545 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
546 | else if (!fl6.flowi6_oif) |
547 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 548 | |
38b7097b HFS |
549 | ipc6.tclass = np->tclass; |
550 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); | |
551 | ||
4c9483b2 | 552 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
b42835db | 553 | if (IS_ERR(dst)) |
1da177e4 | 554 | goto out; |
8de3351e | 555 | |
26879da5 | 556 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
26879da5 WW |
557 | ipc6.dontfrag = np->dontfrag; |
558 | ipc6.opt = NULL; | |
1da177e4 LT |
559 | |
560 | msg.skb = skb; | |
bbe735e4 | 561 | msg.offset = skb_network_offset(skb); |
763ecff1 | 562 | msg.type = type; |
1da177e4 LT |
563 | |
564 | len = skb->len - msg.offset; | |
67ba4152 | 565 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
1da177e4 | 566 | if (len < 0) { |
4b3418fb BM |
567 | net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", |
568 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
569 | goto out_dst_release; |
570 | } | |
571 | ||
cfdf7647 ED |
572 | rcu_read_lock(); |
573 | idev = __in6_dev_get(skb->dev); | |
1da177e4 | 574 | |
4e64b1ed JP |
575 | if (ip6_append_data(sk, icmpv6_getfrag, &msg, |
576 | len + sizeof(struct icmp6hdr), | |
577 | sizeof(struct icmp6hdr), | |
578 | &ipc6, &fl6, (struct rt6_info *)dst, | |
579 | MSG_DONTWAIT, &sockc_unused)) { | |
43a43b60 | 580 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 581 | ip6_flush_pending_frames(sk); |
cfdf7647 | 582 | } else { |
4e64b1ed JP |
583 | icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, |
584 | len + sizeof(struct icmp6hdr)); | |
1da177e4 | 585 | } |
cfdf7647 | 586 | rcu_read_unlock(); |
1da177e4 LT |
587 | out_dst_release: |
588 | dst_release(dst); | |
589 | out: | |
405666db | 590 | icmpv6_xmit_unlock(sk); |
7ba91ecb JDB |
591 | out_bh_enable: |
592 | local_bh_enable(); | |
1da177e4 | 593 | } |
5f5624cf PS |
594 | |
595 | /* Slightly more convenient version of icmp6_send. | |
596 | */ | |
597 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) | |
598 | { | |
b1cadc1a | 599 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); |
5f5624cf PS |
600 | kfree_skb(skb); |
601 | } | |
7159039a | 602 | |
5fbba8ac ED |
603 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH |
604 | * if sufficient data bytes are available | |
605 | * @nhs is the size of the tunnel header(s) : | |
606 | * Either an IPv4 header for SIT encap | |
607 | * an IPv4 header + GRE header for GRE encap | |
608 | */ | |
20e1954f ED |
609 | int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, |
610 | unsigned int data_len) | |
5fbba8ac | 611 | { |
2d7a3b27 | 612 | struct in6_addr temp_saddr; |
5fbba8ac ED |
613 | struct rt6_info *rt; |
614 | struct sk_buff *skb2; | |
20e1954f | 615 | u32 info = 0; |
5fbba8ac ED |
616 | |
617 | if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) | |
618 | return 1; | |
619 | ||
20e1954f ED |
620 | /* RFC 4884 (partial) support for ICMP extensions */ |
621 | if (data_len < 128 || (data_len & 7) || skb->len < data_len) | |
622 | data_len = 0; | |
623 | ||
624 | skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); | |
5fbba8ac ED |
625 | |
626 | if (!skb2) | |
627 | return 1; | |
628 | ||
629 | skb_dst_drop(skb2); | |
630 | skb_pull(skb2, nhs); | |
631 | skb_reset_network_header(skb2); | |
632 | ||
633 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); | |
634 | ||
635 | if (rt && rt->dst.dev) | |
636 | skb2->dev = rt->dst.dev; | |
637 | ||
2d7a3b27 | 638 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); |
20e1954f ED |
639 | |
640 | if (data_len) { | |
641 | /* RFC 4884 (partial) support : | |
642 | * insert 0 padding at the end, before the extensions | |
643 | */ | |
644 | __skb_push(skb2, nhs); | |
645 | skb_reset_network_header(skb2); | |
646 | memmove(skb2->data, skb2->data + nhs, data_len - nhs); | |
647 | memset(skb2->data + data_len - nhs, 0, nhs); | |
648 | /* RFC 4884 4.5 : Length is measured in 64-bit words, | |
649 | * and stored in reserved[0] | |
650 | */ | |
651 | info = (data_len/8) << 24; | |
652 | } | |
2d7a3b27 ED |
653 | if (type == ICMP_TIME_EXCEEDED) |
654 | icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
20e1954f | 655 | info, &temp_saddr); |
2d7a3b27 ED |
656 | else |
657 | icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, | |
20e1954f | 658 | info, &temp_saddr); |
5fbba8ac ED |
659 | if (rt) |
660 | ip6_rt_put(rt); | |
661 | ||
662 | kfree_skb(skb2); | |
663 | ||
664 | return 0; | |
665 | } | |
666 | EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); | |
667 | ||
1da177e4 LT |
668 | static void icmpv6_echo_reply(struct sk_buff *skb) |
669 | { | |
c346dca1 | 670 | struct net *net = dev_net(skb->dev); |
84427d53 | 671 | struct sock *sk; |
1da177e4 | 672 | struct inet6_dev *idev; |
84427d53 | 673 | struct ipv6_pinfo *np; |
b71d1d42 | 674 | const struct in6_addr *saddr = NULL; |
cc70ab26 | 675 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 | 676 | struct icmp6hdr tmp_hdr; |
4c9483b2 | 677 | struct flowi6 fl6; |
1da177e4 LT |
678 | struct icmpv6_msg msg; |
679 | struct dst_entry *dst; | |
26879da5 | 680 | struct ipcm6_cookie ipc6; |
e110861f | 681 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
c14ac945 | 682 | struct sockcm_cookie sockc_unused = {0}; |
1da177e4 | 683 | |
0660e03f | 684 | saddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 685 | |
509aba3b | 686 | if (!ipv6_unicast_destination(skb) && |
ec35b61e | 687 | !(net->ipv6.sysctl.anycast_src_echo_reply && |
2647a9b0 | 688 | ipv6_anycast_destination(skb_dst(skb), saddr))) |
1da177e4 LT |
689 | saddr = NULL; |
690 | ||
691 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); | |
692 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; | |
693 | ||
4c9483b2 DM |
694 | memset(&fl6, 0, sizeof(fl6)); |
695 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 696 | fl6.daddr = ipv6_hdr(skb)->saddr; |
1da177e4 | 697 | if (saddr) |
4e3fd7a0 | 698 | fl6.saddr = *saddr; |
1b70d792 | 699 | fl6.flowi6_oif = icmp6_iif(skb); |
1958b856 | 700 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
e110861f | 701 | fl6.flowi6_mark = mark; |
e2d118a1 | 702 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
4c9483b2 | 703 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 704 | |
7ba91ecb | 705 | local_bh_disable(); |
fdc0bde9 | 706 | sk = icmpv6_xmit_lock(net); |
63159f29 | 707 | if (!sk) |
7ba91ecb | 708 | goto out_bh_enable; |
e110861f | 709 | sk->sk_mark = mark; |
fdc0bde9 | 710 | np = inet6_sk(sk); |
405666db | 711 | |
4c9483b2 DM |
712 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
713 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
714 | else if (!fl6.flowi6_oif) |
715 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 716 | |
4e64b1ed | 717 | if (ip6_dst_lookup(net, sk, &dst, &fl6)) |
1da177e4 | 718 | goto out; |
4c9483b2 | 719 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
452edd59 | 720 | if (IS_ERR(dst)) |
e104411b | 721 | goto out; |
1da177e4 | 722 | |
cfdf7647 | 723 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
724 | |
725 | msg.skb = skb; | |
726 | msg.offset = 0; | |
763ecff1 | 727 | msg.type = ICMPV6_ECHO_REPLY; |
1da177e4 | 728 | |
26879da5 WW |
729 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
730 | ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); | |
731 | ipc6.dontfrag = np->dontfrag; | |
732 | ipc6.opt = NULL; | |
733 | ||
4e64b1ed JP |
734 | if (ip6_append_data(sk, icmpv6_getfrag, &msg, |
735 | skb->len + sizeof(struct icmp6hdr), | |
736 | sizeof(struct icmp6hdr), &ipc6, &fl6, | |
737 | (struct rt6_info *)dst, MSG_DONTWAIT, | |
738 | &sockc_unused)) { | |
a16292a0 | 739 | __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 740 | ip6_flush_pending_frames(sk); |
cfdf7647 | 741 | } else { |
4e64b1ed JP |
742 | icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, |
743 | skb->len + sizeof(struct icmp6hdr)); | |
1da177e4 | 744 | } |
1da177e4 | 745 | dst_release(dst); |
1ab1457c | 746 | out: |
405666db | 747 | icmpv6_xmit_unlock(sk); |
7ba91ecb JDB |
748 | out_bh_enable: |
749 | local_bh_enable(); | |
1da177e4 LT |
750 | } |
751 | ||
b94f1c09 | 752 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
1da177e4 | 753 | { |
41135cc8 | 754 | const struct inet6_protocol *ipprot; |
1da177e4 | 755 | int inner_offset; |
75f2811c | 756 | __be16 frag_off; |
f9242b6b | 757 | u8 nexthdr; |
7304fe46 | 758 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
759 | |
760 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
7304fe46 | 761 | goto out; |
1da177e4 LT |
762 | |
763 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; | |
764 | if (ipv6_ext_hdr(nexthdr)) { | |
765 | /* now skip over extension headers */ | |
75f2811c JG |
766 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
767 | &nexthdr, &frag_off); | |
67ba4152 | 768 | if (inner_offset < 0) |
7304fe46 | 769 | goto out; |
1da177e4 LT |
770 | } else { |
771 | inner_offset = sizeof(struct ipv6hdr); | |
772 | } | |
773 | ||
774 | /* Checkin header including 8 bytes of inner protocol header. */ | |
775 | if (!pskb_may_pull(skb, inner_offset+8)) | |
7304fe46 | 776 | goto out; |
1da177e4 | 777 | |
1da177e4 LT |
778 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
779 | Without this we will not able f.e. to make source routed | |
780 | pmtu discovery. | |
781 | Corresponding argument (opt) to notifiers is already added. | |
782 | --ANK (980726) | |
783 | */ | |
784 | ||
f9242b6b | 785 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
1da177e4 LT |
786 | if (ipprot && ipprot->err_handler) |
787 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); | |
1da177e4 | 788 | |
69d6da0b | 789 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
7304fe46 DJ |
790 | return; |
791 | ||
792 | out: | |
a16292a0 | 793 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
1da177e4 | 794 | } |
1ab1457c | 795 | |
1da177e4 LT |
796 | /* |
797 | * Handle icmp messages | |
798 | */ | |
799 | ||
e5bbef20 | 800 | static int icmpv6_rcv(struct sk_buff *skb) |
1da177e4 | 801 | { |
1da177e4 LT |
802 | struct net_device *dev = skb->dev; |
803 | struct inet6_dev *idev = __in6_dev_get(dev); | |
b71d1d42 | 804 | const struct in6_addr *saddr, *daddr; |
1da177e4 | 805 | struct icmp6hdr *hdr; |
d5fdd6ba | 806 | u8 type; |
e3e32170 | 807 | bool success = false; |
1da177e4 | 808 | |
aebcf82c | 809 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
def8b4fa | 810 | struct sec_path *sp = skb_sec_path(skb); |
8b7817f3 HX |
811 | int nh; |
812 | ||
def8b4fa | 813 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
aebcf82c HX |
814 | XFRM_STATE_ICMP)) |
815 | goto drop_no_count; | |
816 | ||
81aded24 | 817 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
8b7817f3 HX |
818 | goto drop_no_count; |
819 | ||
820 | nh = skb_network_offset(skb); | |
821 | skb_set_network_header(skb, sizeof(*hdr)); | |
822 | ||
823 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
824 | goto drop_no_count; | |
825 | ||
826 | skb_set_network_header(skb, nh); | |
827 | } | |
828 | ||
a16292a0 | 829 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
1da177e4 | 830 | |
0660e03f ACM |
831 | saddr = &ipv6_hdr(skb)->saddr; |
832 | daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 833 | |
39471ac8 | 834 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
ba7a46f1 JP |
835 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
836 | saddr, daddr); | |
39471ac8 | 837 | goto csum_error; |
1da177e4 LT |
838 | } |
839 | ||
8cf22943 HX |
840 | if (!pskb_pull(skb, sizeof(*hdr))) |
841 | goto discard_it; | |
1da177e4 | 842 | |
cc70ab26 | 843 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
844 | |
845 | type = hdr->icmp6_type; | |
846 | ||
f3832ed2 | 847 | ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); |
1da177e4 LT |
848 | |
849 | switch (type) { | |
850 | case ICMPV6_ECHO_REQUEST: | |
851 | icmpv6_echo_reply(skb); | |
852 | break; | |
853 | ||
854 | case ICMPV6_ECHO_REPLY: | |
e3e32170 | 855 | success = ping_rcv(skb); |
1da177e4 LT |
856 | break; |
857 | ||
858 | case ICMPV6_PKT_TOOBIG: | |
859 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update | |
860 | standard destination cache. Seems, only "advanced" | |
861 | destination cache will allow to solve this problem | |
862 | --ANK (980726) | |
863 | */ | |
864 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
865 | goto discard_it; | |
cc70ab26 | 866 | hdr = icmp6_hdr(skb); |
1da177e4 | 867 | |
275757e6 GS |
868 | /* to notify */ |
869 | /* fall through */ | |
1da177e4 LT |
870 | case ICMPV6_DEST_UNREACH: |
871 | case ICMPV6_TIME_EXCEED: | |
872 | case ICMPV6_PARAMPROB: | |
873 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
874 | break; | |
875 | ||
876 | case NDISC_ROUTER_SOLICITATION: | |
877 | case NDISC_ROUTER_ADVERTISEMENT: | |
878 | case NDISC_NEIGHBOUR_SOLICITATION: | |
879 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
880 | case NDISC_REDIRECT: | |
881 | ndisc_rcv(skb); | |
882 | break; | |
883 | ||
884 | case ICMPV6_MGM_QUERY: | |
885 | igmp6_event_query(skb); | |
886 | break; | |
887 | ||
888 | case ICMPV6_MGM_REPORT: | |
889 | igmp6_event_report(skb); | |
890 | break; | |
891 | ||
892 | case ICMPV6_MGM_REDUCTION: | |
893 | case ICMPV6_NI_QUERY: | |
894 | case ICMPV6_NI_REPLY: | |
895 | case ICMPV6_MLD2_REPORT: | |
896 | case ICMPV6_DHAAD_REQUEST: | |
897 | case ICMPV6_DHAAD_REPLY: | |
898 | case ICMPV6_MOBILE_PREFIX_SOL: | |
899 | case ICMPV6_MOBILE_PREFIX_ADV: | |
900 | break; | |
901 | ||
902 | default: | |
1da177e4 LT |
903 | /* informational */ |
904 | if (type & ICMPV6_INFOMSG_MASK) | |
905 | break; | |
906 | ||
4b3418fb BM |
907 | net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", |
908 | saddr, daddr); | |
ea85a0a2 | 909 | |
1ab1457c YH |
910 | /* |
911 | * error of unknown type. | |
912 | * must pass to upper level | |
1da177e4 LT |
913 | */ |
914 | ||
915 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
3ff50b79 SH |
916 | } |
917 | ||
e3e32170 RJ |
918 | /* until the v6 path can be better sorted assume failure and |
919 | * preserve the status quo behaviour for the rest of the paths to here | |
920 | */ | |
921 | if (success) | |
922 | consume_skb(skb); | |
923 | else | |
924 | kfree_skb(skb); | |
925 | ||
1da177e4 LT |
926 | return 0; |
927 | ||
6a5dc9e5 | 928 | csum_error: |
a16292a0 | 929 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); |
1da177e4 | 930 | discard_it: |
a16292a0 | 931 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
8b7817f3 | 932 | drop_no_count: |
1da177e4 LT |
933 | kfree_skb(skb); |
934 | return 0; | |
935 | } | |
936 | ||
4c9483b2 | 937 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
95e41e93 YH |
938 | u8 type, |
939 | const struct in6_addr *saddr, | |
940 | const struct in6_addr *daddr, | |
941 | int oif) | |
942 | { | |
4c9483b2 | 943 | memset(fl6, 0, sizeof(*fl6)); |
4e3fd7a0 AD |
944 | fl6->saddr = *saddr; |
945 | fl6->daddr = *daddr; | |
67ba4152 | 946 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1958b856 DM |
947 | fl6->fl6_icmp_type = type; |
948 | fl6->fl6_icmp_code = 0; | |
4c9483b2 DM |
949 | fl6->flowi6_oif = oif; |
950 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
95e41e93 YH |
951 | } |
952 | ||
98c6d1b2 | 953 | static int __net_init icmpv6_sk_init(struct net *net) |
1da177e4 LT |
954 | { |
955 | struct sock *sk; | |
956 | int err, i, j; | |
957 | ||
98c6d1b2 DL |
958 | net->ipv6.icmp_sk = |
959 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); | |
63159f29 | 960 | if (!net->ipv6.icmp_sk) |
79c91159 DL |
961 | return -ENOMEM; |
962 | ||
6f912042 | 963 | for_each_possible_cpu(i) { |
1ed8516f DL |
964 | err = inet_ctl_sock_create(&sk, PF_INET6, |
965 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 966 | if (err < 0) { |
f3213831 | 967 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
1da177e4 LT |
968 | err); |
969 | goto fail; | |
970 | } | |
971 | ||
1ed8516f | 972 | net->ipv6.icmp_sk[i] = sk; |
5c8cafd6 | 973 | |
1da177e4 LT |
974 | /* Enough space for 2 64K ICMP packets, including |
975 | * sk_buff struct overhead. | |
976 | */ | |
87fb4b7b | 977 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1da177e4 | 978 | } |
1da177e4 LT |
979 | return 0; |
980 | ||
981 | fail: | |
5c8cafd6 | 982 | for (j = 0; j < i; j++) |
1ed8516f | 983 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
98c6d1b2 | 984 | kfree(net->ipv6.icmp_sk); |
1da177e4 LT |
985 | return err; |
986 | } | |
987 | ||
98c6d1b2 | 988 | static void __net_exit icmpv6_sk_exit(struct net *net) |
1da177e4 LT |
989 | { |
990 | int i; | |
991 | ||
6f912042 | 992 | for_each_possible_cpu(i) { |
1ed8516f | 993 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
1da177e4 | 994 | } |
98c6d1b2 DL |
995 | kfree(net->ipv6.icmp_sk); |
996 | } | |
997 | ||
8ed7edce | 998 | static struct pernet_operations icmpv6_sk_ops = { |
67ba4152 IM |
999 | .init = icmpv6_sk_init, |
1000 | .exit = icmpv6_sk_exit, | |
98c6d1b2 DL |
1001 | }; |
1002 | ||
1003 | int __init icmpv6_init(void) | |
1004 | { | |
1005 | int err; | |
1006 | ||
1007 | err = register_pernet_subsys(&icmpv6_sk_ops); | |
1008 | if (err < 0) | |
1009 | return err; | |
1010 | ||
1011 | err = -EAGAIN; | |
1012 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) | |
1013 | goto fail; | |
5f5624cf PS |
1014 | |
1015 | err = inet6_register_icmp_sender(icmp6_send); | |
1016 | if (err) | |
1017 | goto sender_reg_err; | |
98c6d1b2 DL |
1018 | return 0; |
1019 | ||
5f5624cf PS |
1020 | sender_reg_err: |
1021 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); | |
98c6d1b2 | 1022 | fail: |
f3213831 | 1023 | pr_err("Failed to register ICMP6 protocol\n"); |
98c6d1b2 DL |
1024 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1025 | return err; | |
1026 | } | |
1027 | ||
8ed7edce | 1028 | void icmpv6_cleanup(void) |
98c6d1b2 | 1029 | { |
5f5624cf | 1030 | inet6_unregister_icmp_sender(icmp6_send); |
98c6d1b2 | 1031 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1da177e4 LT |
1032 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
1033 | } | |
1034 | ||
98c6d1b2 | 1035 | |
9b5b5cff | 1036 | static const struct icmp6_err { |
1da177e4 LT |
1037 | int err; |
1038 | int fatal; | |
1039 | } tab_unreach[] = { | |
1040 | { /* NOROUTE */ | |
1041 | .err = ENETUNREACH, | |
1042 | .fatal = 0, | |
1043 | }, | |
1044 | { /* ADM_PROHIBITED */ | |
1045 | .err = EACCES, | |
1046 | .fatal = 1, | |
1047 | }, | |
1048 | { /* Was NOT_NEIGHBOUR, now reserved */ | |
1049 | .err = EHOSTUNREACH, | |
1050 | .fatal = 0, | |
1051 | }, | |
1052 | { /* ADDR_UNREACH */ | |
1053 | .err = EHOSTUNREACH, | |
1054 | .fatal = 0, | |
1055 | }, | |
1056 | { /* PORT_UNREACH */ | |
1057 | .err = ECONNREFUSED, | |
1058 | .fatal = 1, | |
1059 | }, | |
61e76b17 JB |
1060 | { /* POLICY_FAIL */ |
1061 | .err = EACCES, | |
1062 | .fatal = 1, | |
1063 | }, | |
1064 | { /* REJECT_ROUTE */ | |
1065 | .err = EACCES, | |
1066 | .fatal = 1, | |
1067 | }, | |
1da177e4 LT |
1068 | }; |
1069 | ||
d5fdd6ba | 1070 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1da177e4 LT |
1071 | { |
1072 | int fatal = 0; | |
1073 | ||
1074 | *err = EPROTO; | |
1075 | ||
1076 | switch (type) { | |
1077 | case ICMPV6_DEST_UNREACH: | |
1078 | fatal = 1; | |
61e76b17 | 1079 | if (code < ARRAY_SIZE(tab_unreach)) { |
1da177e4 LT |
1080 | *err = tab_unreach[code].err; |
1081 | fatal = tab_unreach[code].fatal; | |
1082 | } | |
1083 | break; | |
1084 | ||
1085 | case ICMPV6_PKT_TOOBIG: | |
1086 | *err = EMSGSIZE; | |
1087 | break; | |
1ab1457c | 1088 | |
1da177e4 LT |
1089 | case ICMPV6_PARAMPROB: |
1090 | *err = EPROTO; | |
1091 | fatal = 1; | |
1092 | break; | |
1093 | ||
1094 | case ICMPV6_TIME_EXCEED: | |
1095 | *err = EHOSTUNREACH; | |
1096 | break; | |
3ff50b79 | 1097 | } |
1da177e4 LT |
1098 | |
1099 | return fatal; | |
1100 | } | |
7159039a YH |
1101 | EXPORT_SYMBOL(icmpv6_err_convert); |
1102 | ||
1da177e4 | 1103 | #ifdef CONFIG_SYSCTL |
e8243534 | 1104 | static struct ctl_table ipv6_icmp_table_template[] = { |
1da177e4 | 1105 | { |
1da177e4 | 1106 | .procname = "ratelimit", |
41a76906 | 1107 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1da177e4 LT |
1108 | .maxlen = sizeof(int), |
1109 | .mode = 0644, | |
6d9f239a | 1110 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 1111 | }, |
f8572d8f | 1112 | { }, |
1da177e4 | 1113 | }; |
760f2d01 | 1114 | |
2c8c1e72 | 1115 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
760f2d01 DL |
1116 | { |
1117 | struct ctl_table *table; | |
1118 | ||
1119 | table = kmemdup(ipv6_icmp_table_template, | |
1120 | sizeof(ipv6_icmp_table_template), | |
1121 | GFP_KERNEL); | |
5ee09105 | 1122 | |
c027aab4 | 1123 | if (table) |
5ee09105 YH |
1124 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
1125 | ||
760f2d01 DL |
1126 | return table; |
1127 | } | |
1da177e4 | 1128 | #endif |