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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 | ||
6d0bfe22 LC |
253 | int 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; | |
258 | int err = 0; | |
259 | ||
e5d08d71 | 260 | skb = skb_peek(&sk->sk_write_queue); |
63159f29 | 261 | if (!skb) |
1da177e4 LT |
262 | goto out; |
263 | ||
cc70ab26 | 264 | icmp6h = icmp6_hdr(skb); |
1da177e4 LT |
265 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
266 | icmp6h->icmp6_cksum = 0; | |
267 | ||
268 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
07f0757a | 269 | skb->csum = csum_partial(icmp6h, |
1da177e4 | 270 | sizeof(struct icmp6hdr), skb->csum); |
4c9483b2 DM |
271 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
272 | &fl6->daddr, | |
273 | len, fl6->flowi6_proto, | |
1da177e4 LT |
274 | skb->csum); |
275 | } else { | |
868c86bc | 276 | __wsum tmp_csum = 0; |
1da177e4 LT |
277 | |
278 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
279 | tmp_csum = csum_add(tmp_csum, skb->csum); | |
280 | } | |
281 | ||
07f0757a | 282 | tmp_csum = csum_partial(icmp6h, |
1da177e4 | 283 | sizeof(struct icmp6hdr), tmp_csum); |
4c9483b2 DM |
284 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
285 | &fl6->daddr, | |
286 | len, fl6->flowi6_proto, | |
868c86bc | 287 | tmp_csum); |
1da177e4 | 288 | } |
1da177e4 LT |
289 | ip6_push_pending_frames(sk); |
290 | out: | |
291 | return err; | |
292 | } | |
293 | ||
294 | struct icmpv6_msg { | |
295 | struct sk_buff *skb; | |
296 | int offset; | |
763ecff1 | 297 | uint8_t type; |
1da177e4 LT |
298 | }; |
299 | ||
300 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) | |
301 | { | |
302 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; | |
303 | struct sk_buff *org_skb = msg->skb; | |
5f92a738 | 304 | __wsum csum = 0; |
1da177e4 LT |
305 | |
306 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, | |
307 | to, len, csum); | |
308 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
763ecff1 YK |
309 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
310 | nf_ct_attach(skb, org_skb); | |
1da177e4 LT |
311 | return 0; |
312 | } | |
313 | ||
07a93626 | 314 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
79383236 MN |
315 | static void mip6_addr_swap(struct sk_buff *skb) |
316 | { | |
0660e03f | 317 | struct ipv6hdr *iph = ipv6_hdr(skb); |
79383236 MN |
318 | struct inet6_skb_parm *opt = IP6CB(skb); |
319 | struct ipv6_destopt_hao *hao; | |
320 | struct in6_addr tmp; | |
321 | int off; | |
322 | ||
323 | if (opt->dsthao) { | |
324 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); | |
325 | if (likely(off >= 0)) { | |
d56f90a7 ACM |
326 | hao = (struct ipv6_destopt_hao *) |
327 | (skb_network_header(skb) + off); | |
4e3fd7a0 AD |
328 | tmp = iph->saddr; |
329 | iph->saddr = hao->addr; | |
330 | hao->addr = tmp; | |
79383236 MN |
331 | } |
332 | } | |
333 | } | |
334 | #else | |
335 | static inline void mip6_addr_swap(struct sk_buff *skb) {} | |
336 | #endif | |
337 | ||
e8243534 | 338 | static struct dst_entry *icmpv6_route_lookup(struct net *net, |
339 | struct sk_buff *skb, | |
340 | struct sock *sk, | |
341 | struct flowi6 *fl6) | |
b42835db DM |
342 | { |
343 | struct dst_entry *dst, *dst2; | |
4c9483b2 | 344 | struct flowi6 fl2; |
b42835db DM |
345 | int err; |
346 | ||
343d60aa | 347 | err = ip6_dst_lookup(net, sk, &dst, fl6); |
b42835db DM |
348 | if (err) |
349 | return ERR_PTR(err); | |
350 | ||
351 | /* | |
352 | * We won't send icmp if the destination is known | |
353 | * anycast. | |
354 | */ | |
2647a9b0 | 355 | if (ipv6_anycast_destination(dst, &fl6->daddr)) { |
ba7a46f1 | 356 | net_dbg_ratelimited("icmp6_send: acast source\n"); |
b42835db DM |
357 | dst_release(dst); |
358 | return ERR_PTR(-EINVAL); | |
359 | } | |
360 | ||
361 | /* No need to clone since we're just using its address. */ | |
362 | dst2 = dst; | |
363 | ||
4c9483b2 | 364 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); |
452edd59 | 365 | if (!IS_ERR(dst)) { |
b42835db DM |
366 | if (dst != dst2) |
367 | return dst; | |
452edd59 DM |
368 | } else { |
369 | if (PTR_ERR(dst) == -EPERM) | |
370 | dst = NULL; | |
371 | else | |
372 | return dst; | |
b42835db DM |
373 | } |
374 | ||
4c9483b2 | 375 | err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); |
b42835db DM |
376 | if (err) |
377 | goto relookup_failed; | |
378 | ||
343d60aa | 379 | err = ip6_dst_lookup(net, sk, &dst2, &fl2); |
b42835db DM |
380 | if (err) |
381 | goto relookup_failed; | |
382 | ||
4c9483b2 | 383 | dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); |
452edd59 | 384 | if (!IS_ERR(dst2)) { |
b42835db DM |
385 | dst_release(dst); |
386 | dst = dst2; | |
452edd59 DM |
387 | } else { |
388 | err = PTR_ERR(dst2); | |
389 | if (err == -EPERM) { | |
390 | dst_release(dst); | |
391 | return dst2; | |
392 | } else | |
393 | goto relookup_failed; | |
b42835db DM |
394 | } |
395 | ||
396 | relookup_failed: | |
397 | if (dst) | |
398 | return dst; | |
399 | return ERR_PTR(err); | |
400 | } | |
401 | ||
1b70d792 DA |
402 | static int icmp6_iif(const struct sk_buff *skb) |
403 | { | |
404 | int iif = skb->dev->ifindex; | |
405 | ||
406 | /* for local traffic to local address, skb dev is the loopback | |
407 | * device. Check if there is a dst attached to the skb and if so | |
408 | * get the real device index. | |
409 | */ | |
410 | if (unlikely(iif == LOOPBACK_IFINDEX)) { | |
411 | const struct rt6_info *rt6 = skb_rt6_info(skb); | |
412 | ||
413 | if (rt6) | |
414 | iif = rt6->rt6i_idev->dev->ifindex; | |
415 | } | |
416 | ||
417 | return iif; | |
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 | 425 | { |
c346dca1 | 426 | struct net *net = dev_net(skb->dev); |
1da177e4 | 427 | struct inet6_dev *idev = NULL; |
0660e03f | 428 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
84427d53 YH |
429 | struct sock *sk; |
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; |
c14ac945 | 436 | struct sockcm_cookie sockc_unused = {0}; |
26879da5 | 437 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
438 | int iif = 0; |
439 | int addr_type = 0; | |
440 | int len; | |
1da177e4 | 441 | int err = 0; |
e110861f | 442 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 443 | |
27a884dc | 444 | if ((u8 *)hdr < skb->head || |
29a3cad5 | 445 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
1da177e4 LT |
446 | return; |
447 | ||
448 | /* | |
1ab1457c | 449 | * Make sure we respect the rules |
1da177e4 | 450 | * i.e. RFC 1885 2.4(e) |
5f5624cf | 451 | * Rule (e.1) is enforced by not using icmp6_send |
1da177e4 LT |
452 | * in any code that processes icmp errors. |
453 | */ | |
454 | addr_type = ipv6_addr_type(&hdr->daddr); | |
455 | ||
446fab59 | 456 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || |
d94c1f92 | 457 | ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) |
1da177e4 LT |
458 | saddr = &hdr->daddr; |
459 | ||
460 | /* | |
461 | * Dest addr check | |
462 | */ | |
463 | ||
9a6b4b39 | 464 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
1da177e4 | 465 | if (type != ICMPV6_PKT_TOOBIG && |
1ab1457c YH |
466 | !(type == ICMPV6_PARAMPROB && |
467 | code == ICMPV6_UNK_OPTION && | |
1da177e4 LT |
468 | (opt_unrec(skb, info)))) |
469 | return; | |
470 | ||
471 | saddr = NULL; | |
472 | } | |
473 | ||
474 | addr_type = ipv6_addr_type(&hdr->saddr); | |
475 | ||
476 | /* | |
477 | * Source addr check | |
478 | */ | |
479 | ||
4832c30d | 480 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
1b70d792 | 481 | iif = icmp6_iif(skb); |
4832c30d | 482 | } else { |
79dc7e3f DA |
483 | dst = skb_dst(skb); |
484 | iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); | |
485 | } | |
1da177e4 LT |
486 | |
487 | /* | |
8de3351e YH |
488 | * Must not send error if the source does not uniquely |
489 | * identify a single node (RFC2463 Section 2.4). | |
490 | * We check unspecified / multicast addresses here, | |
491 | * and anycast addresses will be checked later. | |
1da177e4 LT |
492 | */ |
493 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { | |
4b3418fb BM |
494 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", |
495 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
496 | return; |
497 | } | |
498 | ||
1ab1457c | 499 | /* |
1da177e4 LT |
500 | * Never answer to a ICMP packet. |
501 | */ | |
502 | if (is_ineligible(skb)) { | |
4b3418fb BM |
503 | net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", |
504 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
505 | return; |
506 | } | |
507 | ||
7ba91ecb JDB |
508 | /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ |
509 | local_bh_disable(); | |
510 | ||
511 | /* Check global sysctl_icmp_msgs_per_sec ratelimit */ | |
849a44de | 512 | if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(type)) |
7ba91ecb JDB |
513 | goto out_bh_enable; |
514 | ||
79383236 MN |
515 | mip6_addr_swap(skb); |
516 | ||
4c9483b2 DM |
517 | memset(&fl6, 0, sizeof(fl6)); |
518 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 519 | fl6.daddr = hdr->saddr; |
b1cadc1a ED |
520 | if (force_saddr) |
521 | saddr = force_saddr; | |
1da177e4 | 522 | if (saddr) |
4e3fd7a0 | 523 | fl6.saddr = *saddr; |
e110861f | 524 | fl6.flowi6_mark = mark; |
4c9483b2 | 525 | fl6.flowi6_oif = iif; |
1958b856 DM |
526 | fl6.fl6_icmp_type = type; |
527 | fl6.fl6_icmp_code = code; | |
e2d118a1 | 528 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
23aebdac | 529 | fl6.mp_hash = rt6_multipath_hash(&fl6, skb); |
4c9483b2 | 530 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 531 | |
fdc0bde9 | 532 | sk = icmpv6_xmit_lock(net); |
63159f29 | 533 | if (!sk) |
7ba91ecb | 534 | goto out_bh_enable; |
c0303efe | 535 | |
e110861f | 536 | sk->sk_mark = mark; |
fdc0bde9 | 537 | np = inet6_sk(sk); |
405666db | 538 | |
4c9483b2 | 539 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
1da177e4 LT |
540 | goto out; |
541 | ||
542 | tmp_hdr.icmp6_type = type; | |
543 | tmp_hdr.icmp6_code = code; | |
544 | tmp_hdr.icmp6_cksum = 0; | |
545 | tmp_hdr.icmp6_pointer = htonl(info); | |
546 | ||
4c9483b2 DM |
547 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
548 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
549 | else if (!fl6.flowi6_oif) |
550 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 551 | |
38b7097b HFS |
552 | ipc6.tclass = np->tclass; |
553 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); | |
554 | ||
4c9483b2 | 555 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
b42835db | 556 | if (IS_ERR(dst)) |
1da177e4 | 557 | goto out; |
8de3351e | 558 | |
26879da5 | 559 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
26879da5 WW |
560 | ipc6.dontfrag = np->dontfrag; |
561 | ipc6.opt = NULL; | |
1da177e4 LT |
562 | |
563 | msg.skb = skb; | |
bbe735e4 | 564 | msg.offset = skb_network_offset(skb); |
763ecff1 | 565 | msg.type = type; |
1da177e4 LT |
566 | |
567 | len = skb->len - msg.offset; | |
67ba4152 | 568 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
1da177e4 | 569 | if (len < 0) { |
4b3418fb BM |
570 | net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", |
571 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
572 | goto out_dst_release; |
573 | } | |
574 | ||
cfdf7647 ED |
575 | rcu_read_lock(); |
576 | idev = __in6_dev_get(skb->dev); | |
1da177e4 LT |
577 | |
578 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, | |
579 | len + sizeof(struct icmp6hdr), | |
26879da5 WW |
580 | sizeof(struct icmp6hdr), |
581 | &ipc6, &fl6, (struct rt6_info *)dst, | |
582 | MSG_DONTWAIT, &sockc_unused); | |
1da177e4 | 583 | if (err) { |
43a43b60 | 584 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 585 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
586 | } else { |
587 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
588 | len + sizeof(struct icmp6hdr)); | |
1da177e4 | 589 | } |
cfdf7647 | 590 | rcu_read_unlock(); |
1da177e4 LT |
591 | out_dst_release: |
592 | dst_release(dst); | |
593 | out: | |
405666db | 594 | icmpv6_xmit_unlock(sk); |
7ba91ecb JDB |
595 | out_bh_enable: |
596 | local_bh_enable(); | |
1da177e4 | 597 | } |
5f5624cf PS |
598 | |
599 | /* Slightly more convenient version of icmp6_send. | |
600 | */ | |
601 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) | |
602 | { | |
b1cadc1a | 603 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); |
5f5624cf PS |
604 | kfree_skb(skb); |
605 | } | |
7159039a | 606 | |
5fbba8ac ED |
607 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH |
608 | * if sufficient data bytes are available | |
609 | * @nhs is the size of the tunnel header(s) : | |
610 | * Either an IPv4 header for SIT encap | |
611 | * an IPv4 header + GRE header for GRE encap | |
612 | */ | |
20e1954f ED |
613 | int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, |
614 | unsigned int data_len) | |
5fbba8ac | 615 | { |
2d7a3b27 | 616 | struct in6_addr temp_saddr; |
5fbba8ac ED |
617 | struct rt6_info *rt; |
618 | struct sk_buff *skb2; | |
20e1954f | 619 | u32 info = 0; |
5fbba8ac ED |
620 | |
621 | if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) | |
622 | return 1; | |
623 | ||
20e1954f ED |
624 | /* RFC 4884 (partial) support for ICMP extensions */ |
625 | if (data_len < 128 || (data_len & 7) || skb->len < data_len) | |
626 | data_len = 0; | |
627 | ||
628 | skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); | |
5fbba8ac ED |
629 | |
630 | if (!skb2) | |
631 | return 1; | |
632 | ||
633 | skb_dst_drop(skb2); | |
634 | skb_pull(skb2, nhs); | |
635 | skb_reset_network_header(skb2); | |
636 | ||
637 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); | |
638 | ||
639 | if (rt && rt->dst.dev) | |
640 | skb2->dev = rt->dst.dev; | |
641 | ||
2d7a3b27 | 642 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); |
20e1954f ED |
643 | |
644 | if (data_len) { | |
645 | /* RFC 4884 (partial) support : | |
646 | * insert 0 padding at the end, before the extensions | |
647 | */ | |
648 | __skb_push(skb2, nhs); | |
649 | skb_reset_network_header(skb2); | |
650 | memmove(skb2->data, skb2->data + nhs, data_len - nhs); | |
651 | memset(skb2->data + data_len - nhs, 0, nhs); | |
652 | /* RFC 4884 4.5 : Length is measured in 64-bit words, | |
653 | * and stored in reserved[0] | |
654 | */ | |
655 | info = (data_len/8) << 24; | |
656 | } | |
2d7a3b27 ED |
657 | if (type == ICMP_TIME_EXCEEDED) |
658 | icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
20e1954f | 659 | info, &temp_saddr); |
2d7a3b27 ED |
660 | else |
661 | icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, | |
20e1954f | 662 | info, &temp_saddr); |
5fbba8ac ED |
663 | if (rt) |
664 | ip6_rt_put(rt); | |
665 | ||
666 | kfree_skb(skb2); | |
667 | ||
668 | return 0; | |
669 | } | |
670 | EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); | |
671 | ||
1da177e4 LT |
672 | static void icmpv6_echo_reply(struct sk_buff *skb) |
673 | { | |
c346dca1 | 674 | struct net *net = dev_net(skb->dev); |
84427d53 | 675 | struct sock *sk; |
1da177e4 | 676 | struct inet6_dev *idev; |
84427d53 | 677 | struct ipv6_pinfo *np; |
b71d1d42 | 678 | const struct in6_addr *saddr = NULL; |
cc70ab26 | 679 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 | 680 | struct icmp6hdr tmp_hdr; |
4c9483b2 | 681 | struct flowi6 fl6; |
1da177e4 LT |
682 | struct icmpv6_msg msg; |
683 | struct dst_entry *dst; | |
26879da5 | 684 | struct ipcm6_cookie ipc6; |
1da177e4 | 685 | int err = 0; |
e110861f | 686 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
c14ac945 | 687 | struct sockcm_cookie sockc_unused = {0}; |
1da177e4 | 688 | |
0660e03f | 689 | saddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 690 | |
509aba3b | 691 | if (!ipv6_unicast_destination(skb) && |
ec35b61e | 692 | !(net->ipv6.sysctl.anycast_src_echo_reply && |
2647a9b0 | 693 | ipv6_anycast_destination(skb_dst(skb), saddr))) |
1da177e4 LT |
694 | saddr = NULL; |
695 | ||
696 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); | |
697 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; | |
698 | ||
4c9483b2 DM |
699 | memset(&fl6, 0, sizeof(fl6)); |
700 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 701 | fl6.daddr = ipv6_hdr(skb)->saddr; |
1da177e4 | 702 | if (saddr) |
4e3fd7a0 | 703 | fl6.saddr = *saddr; |
1b70d792 | 704 | fl6.flowi6_oif = icmp6_iif(skb); |
1958b856 | 705 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
e110861f | 706 | fl6.flowi6_mark = mark; |
e2d118a1 | 707 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
4c9483b2 | 708 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 709 | |
7ba91ecb | 710 | local_bh_disable(); |
fdc0bde9 | 711 | sk = icmpv6_xmit_lock(net); |
63159f29 | 712 | if (!sk) |
7ba91ecb | 713 | goto out_bh_enable; |
e110861f | 714 | sk->sk_mark = mark; |
fdc0bde9 | 715 | np = inet6_sk(sk); |
405666db | 716 | |
4c9483b2 DM |
717 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
718 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
719 | else if (!fl6.flowi6_oif) |
720 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 721 | |
343d60aa | 722 | err = ip6_dst_lookup(net, sk, &dst, &fl6); |
1da177e4 LT |
723 | if (err) |
724 | goto out; | |
4c9483b2 | 725 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
452edd59 | 726 | if (IS_ERR(dst)) |
e104411b | 727 | goto out; |
1da177e4 | 728 | |
cfdf7647 | 729 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
730 | |
731 | msg.skb = skb; | |
732 | msg.offset = 0; | |
763ecff1 | 733 | msg.type = ICMPV6_ECHO_REPLY; |
1da177e4 | 734 | |
26879da5 WW |
735 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
736 | ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); | |
737 | ipc6.dontfrag = np->dontfrag; | |
738 | ipc6.opt = NULL; | |
739 | ||
1da177e4 | 740 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), |
26879da5 | 741 | sizeof(struct icmp6hdr), &ipc6, &fl6, |
a2d91a09 | 742 | (struct rt6_info *)dst, MSG_DONTWAIT, |
26879da5 | 743 | &sockc_unused); |
1da177e4 LT |
744 | |
745 | if (err) { | |
a16292a0 | 746 | __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 747 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
748 | } else { |
749 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
750 | skb->len + sizeof(struct icmp6hdr)); | |
1da177e4 | 751 | } |
1da177e4 | 752 | dst_release(dst); |
1ab1457c | 753 | out: |
405666db | 754 | icmpv6_xmit_unlock(sk); |
7ba91ecb JDB |
755 | out_bh_enable: |
756 | local_bh_enable(); | |
1da177e4 LT |
757 | } |
758 | ||
b94f1c09 | 759 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
1da177e4 | 760 | { |
41135cc8 | 761 | const struct inet6_protocol *ipprot; |
1da177e4 | 762 | int inner_offset; |
75f2811c | 763 | __be16 frag_off; |
f9242b6b | 764 | u8 nexthdr; |
7304fe46 | 765 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
766 | |
767 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
7304fe46 | 768 | goto out; |
1da177e4 LT |
769 | |
770 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; | |
771 | if (ipv6_ext_hdr(nexthdr)) { | |
772 | /* now skip over extension headers */ | |
75f2811c JG |
773 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
774 | &nexthdr, &frag_off); | |
67ba4152 | 775 | if (inner_offset < 0) |
7304fe46 | 776 | goto out; |
1da177e4 LT |
777 | } else { |
778 | inner_offset = sizeof(struct ipv6hdr); | |
779 | } | |
780 | ||
781 | /* Checkin header including 8 bytes of inner protocol header. */ | |
782 | if (!pskb_may_pull(skb, inner_offset+8)) | |
7304fe46 | 783 | goto out; |
1da177e4 | 784 | |
1da177e4 LT |
785 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
786 | Without this we will not able f.e. to make source routed | |
787 | pmtu discovery. | |
788 | Corresponding argument (opt) to notifiers is already added. | |
789 | --ANK (980726) | |
790 | */ | |
791 | ||
f9242b6b | 792 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
1da177e4 LT |
793 | if (ipprot && ipprot->err_handler) |
794 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); | |
1da177e4 | 795 | |
69d6da0b | 796 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
7304fe46 DJ |
797 | return; |
798 | ||
799 | out: | |
a16292a0 | 800 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
1da177e4 | 801 | } |
1ab1457c | 802 | |
1da177e4 LT |
803 | /* |
804 | * Handle icmp messages | |
805 | */ | |
806 | ||
e5bbef20 | 807 | static int icmpv6_rcv(struct sk_buff *skb) |
1da177e4 | 808 | { |
1da177e4 LT |
809 | struct net_device *dev = skb->dev; |
810 | struct inet6_dev *idev = __in6_dev_get(dev); | |
b71d1d42 | 811 | const struct in6_addr *saddr, *daddr; |
1da177e4 | 812 | struct icmp6hdr *hdr; |
d5fdd6ba | 813 | u8 type; |
e3e32170 | 814 | bool success = false; |
1da177e4 | 815 | |
aebcf82c | 816 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
def8b4fa | 817 | struct sec_path *sp = skb_sec_path(skb); |
8b7817f3 HX |
818 | int nh; |
819 | ||
def8b4fa | 820 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
aebcf82c HX |
821 | XFRM_STATE_ICMP)) |
822 | goto drop_no_count; | |
823 | ||
81aded24 | 824 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
8b7817f3 HX |
825 | goto drop_no_count; |
826 | ||
827 | nh = skb_network_offset(skb); | |
828 | skb_set_network_header(skb, sizeof(*hdr)); | |
829 | ||
830 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
831 | goto drop_no_count; | |
832 | ||
833 | skb_set_network_header(skb, nh); | |
834 | } | |
835 | ||
a16292a0 | 836 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
1da177e4 | 837 | |
0660e03f ACM |
838 | saddr = &ipv6_hdr(skb)->saddr; |
839 | daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 840 | |
39471ac8 | 841 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
ba7a46f1 JP |
842 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
843 | saddr, daddr); | |
39471ac8 | 844 | goto csum_error; |
1da177e4 LT |
845 | } |
846 | ||
8cf22943 HX |
847 | if (!pskb_pull(skb, sizeof(*hdr))) |
848 | goto discard_it; | |
1da177e4 | 849 | |
cc70ab26 | 850 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
851 | |
852 | type = hdr->icmp6_type; | |
853 | ||
f3832ed2 | 854 | ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); |
1da177e4 LT |
855 | |
856 | switch (type) { | |
857 | case ICMPV6_ECHO_REQUEST: | |
858 | icmpv6_echo_reply(skb); | |
859 | break; | |
860 | ||
861 | case ICMPV6_ECHO_REPLY: | |
e3e32170 | 862 | success = ping_rcv(skb); |
1da177e4 LT |
863 | break; |
864 | ||
865 | case ICMPV6_PKT_TOOBIG: | |
866 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update | |
867 | standard destination cache. Seems, only "advanced" | |
868 | destination cache will allow to solve this problem | |
869 | --ANK (980726) | |
870 | */ | |
871 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
872 | goto discard_it; | |
cc70ab26 | 873 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
874 | |
875 | /* | |
876 | * Drop through to notify | |
877 | */ | |
878 | ||
879 | case ICMPV6_DEST_UNREACH: | |
880 | case ICMPV6_TIME_EXCEED: | |
881 | case ICMPV6_PARAMPROB: | |
882 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
883 | break; | |
884 | ||
885 | case NDISC_ROUTER_SOLICITATION: | |
886 | case NDISC_ROUTER_ADVERTISEMENT: | |
887 | case NDISC_NEIGHBOUR_SOLICITATION: | |
888 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
889 | case NDISC_REDIRECT: | |
890 | ndisc_rcv(skb); | |
891 | break; | |
892 | ||
893 | case ICMPV6_MGM_QUERY: | |
894 | igmp6_event_query(skb); | |
895 | break; | |
896 | ||
897 | case ICMPV6_MGM_REPORT: | |
898 | igmp6_event_report(skb); | |
899 | break; | |
900 | ||
901 | case ICMPV6_MGM_REDUCTION: | |
902 | case ICMPV6_NI_QUERY: | |
903 | case ICMPV6_NI_REPLY: | |
904 | case ICMPV6_MLD2_REPORT: | |
905 | case ICMPV6_DHAAD_REQUEST: | |
906 | case ICMPV6_DHAAD_REPLY: | |
907 | case ICMPV6_MOBILE_PREFIX_SOL: | |
908 | case ICMPV6_MOBILE_PREFIX_ADV: | |
909 | break; | |
910 | ||
911 | default: | |
1da177e4 LT |
912 | /* informational */ |
913 | if (type & ICMPV6_INFOMSG_MASK) | |
914 | break; | |
915 | ||
4b3418fb BM |
916 | net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", |
917 | saddr, daddr); | |
ea85a0a2 | 918 | |
1ab1457c YH |
919 | /* |
920 | * error of unknown type. | |
921 | * must pass to upper level | |
1da177e4 LT |
922 | */ |
923 | ||
924 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
3ff50b79 SH |
925 | } |
926 | ||
e3e32170 RJ |
927 | /* until the v6 path can be better sorted assume failure and |
928 | * preserve the status quo behaviour for the rest of the paths to here | |
929 | */ | |
930 | if (success) | |
931 | consume_skb(skb); | |
932 | else | |
933 | kfree_skb(skb); | |
934 | ||
1da177e4 LT |
935 | return 0; |
936 | ||
6a5dc9e5 | 937 | csum_error: |
a16292a0 | 938 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); |
1da177e4 | 939 | discard_it: |
a16292a0 | 940 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
8b7817f3 | 941 | drop_no_count: |
1da177e4 LT |
942 | kfree_skb(skb); |
943 | return 0; | |
944 | } | |
945 | ||
4c9483b2 | 946 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
95e41e93 YH |
947 | u8 type, |
948 | const struct in6_addr *saddr, | |
949 | const struct in6_addr *daddr, | |
950 | int oif) | |
951 | { | |
4c9483b2 | 952 | memset(fl6, 0, sizeof(*fl6)); |
4e3fd7a0 AD |
953 | fl6->saddr = *saddr; |
954 | fl6->daddr = *daddr; | |
67ba4152 | 955 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1958b856 DM |
956 | fl6->fl6_icmp_type = type; |
957 | fl6->fl6_icmp_code = 0; | |
4c9483b2 DM |
958 | fl6->flowi6_oif = oif; |
959 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
95e41e93 YH |
960 | } |
961 | ||
98c6d1b2 | 962 | static int __net_init icmpv6_sk_init(struct net *net) |
1da177e4 LT |
963 | { |
964 | struct sock *sk; | |
965 | int err, i, j; | |
966 | ||
98c6d1b2 DL |
967 | net->ipv6.icmp_sk = |
968 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); | |
63159f29 | 969 | if (!net->ipv6.icmp_sk) |
79c91159 DL |
970 | return -ENOMEM; |
971 | ||
6f912042 | 972 | for_each_possible_cpu(i) { |
1ed8516f DL |
973 | err = inet_ctl_sock_create(&sk, PF_INET6, |
974 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 975 | if (err < 0) { |
f3213831 | 976 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
1da177e4 LT |
977 | err); |
978 | goto fail; | |
979 | } | |
980 | ||
1ed8516f | 981 | net->ipv6.icmp_sk[i] = sk; |
5c8cafd6 | 982 | |
1da177e4 LT |
983 | /* Enough space for 2 64K ICMP packets, including |
984 | * sk_buff struct overhead. | |
985 | */ | |
87fb4b7b | 986 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1da177e4 | 987 | } |
1da177e4 LT |
988 | return 0; |
989 | ||
990 | fail: | |
5c8cafd6 | 991 | for (j = 0; j < i; j++) |
1ed8516f | 992 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
98c6d1b2 | 993 | kfree(net->ipv6.icmp_sk); |
1da177e4 LT |
994 | return err; |
995 | } | |
996 | ||
98c6d1b2 | 997 | static void __net_exit icmpv6_sk_exit(struct net *net) |
1da177e4 LT |
998 | { |
999 | int i; | |
1000 | ||
6f912042 | 1001 | for_each_possible_cpu(i) { |
1ed8516f | 1002 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
1da177e4 | 1003 | } |
98c6d1b2 DL |
1004 | kfree(net->ipv6.icmp_sk); |
1005 | } | |
1006 | ||
8ed7edce | 1007 | static struct pernet_operations icmpv6_sk_ops = { |
67ba4152 IM |
1008 | .init = icmpv6_sk_init, |
1009 | .exit = icmpv6_sk_exit, | |
98c6d1b2 DL |
1010 | }; |
1011 | ||
1012 | int __init icmpv6_init(void) | |
1013 | { | |
1014 | int err; | |
1015 | ||
1016 | err = register_pernet_subsys(&icmpv6_sk_ops); | |
1017 | if (err < 0) | |
1018 | return err; | |
1019 | ||
1020 | err = -EAGAIN; | |
1021 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) | |
1022 | goto fail; | |
5f5624cf PS |
1023 | |
1024 | err = inet6_register_icmp_sender(icmp6_send); | |
1025 | if (err) | |
1026 | goto sender_reg_err; | |
98c6d1b2 DL |
1027 | return 0; |
1028 | ||
5f5624cf PS |
1029 | sender_reg_err: |
1030 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); | |
98c6d1b2 | 1031 | fail: |
f3213831 | 1032 | pr_err("Failed to register ICMP6 protocol\n"); |
98c6d1b2 DL |
1033 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1034 | return err; | |
1035 | } | |
1036 | ||
8ed7edce | 1037 | void icmpv6_cleanup(void) |
98c6d1b2 | 1038 | { |
5f5624cf | 1039 | inet6_unregister_icmp_sender(icmp6_send); |
98c6d1b2 | 1040 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1da177e4 LT |
1041 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
1042 | } | |
1043 | ||
98c6d1b2 | 1044 | |
9b5b5cff | 1045 | static const struct icmp6_err { |
1da177e4 LT |
1046 | int err; |
1047 | int fatal; | |
1048 | } tab_unreach[] = { | |
1049 | { /* NOROUTE */ | |
1050 | .err = ENETUNREACH, | |
1051 | .fatal = 0, | |
1052 | }, | |
1053 | { /* ADM_PROHIBITED */ | |
1054 | .err = EACCES, | |
1055 | .fatal = 1, | |
1056 | }, | |
1057 | { /* Was NOT_NEIGHBOUR, now reserved */ | |
1058 | .err = EHOSTUNREACH, | |
1059 | .fatal = 0, | |
1060 | }, | |
1061 | { /* ADDR_UNREACH */ | |
1062 | .err = EHOSTUNREACH, | |
1063 | .fatal = 0, | |
1064 | }, | |
1065 | { /* PORT_UNREACH */ | |
1066 | .err = ECONNREFUSED, | |
1067 | .fatal = 1, | |
1068 | }, | |
61e76b17 JB |
1069 | { /* POLICY_FAIL */ |
1070 | .err = EACCES, | |
1071 | .fatal = 1, | |
1072 | }, | |
1073 | { /* REJECT_ROUTE */ | |
1074 | .err = EACCES, | |
1075 | .fatal = 1, | |
1076 | }, | |
1da177e4 LT |
1077 | }; |
1078 | ||
d5fdd6ba | 1079 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1da177e4 LT |
1080 | { |
1081 | int fatal = 0; | |
1082 | ||
1083 | *err = EPROTO; | |
1084 | ||
1085 | switch (type) { | |
1086 | case ICMPV6_DEST_UNREACH: | |
1087 | fatal = 1; | |
61e76b17 | 1088 | if (code < ARRAY_SIZE(tab_unreach)) { |
1da177e4 LT |
1089 | *err = tab_unreach[code].err; |
1090 | fatal = tab_unreach[code].fatal; | |
1091 | } | |
1092 | break; | |
1093 | ||
1094 | case ICMPV6_PKT_TOOBIG: | |
1095 | *err = EMSGSIZE; | |
1096 | break; | |
1ab1457c | 1097 | |
1da177e4 LT |
1098 | case ICMPV6_PARAMPROB: |
1099 | *err = EPROTO; | |
1100 | fatal = 1; | |
1101 | break; | |
1102 | ||
1103 | case ICMPV6_TIME_EXCEED: | |
1104 | *err = EHOSTUNREACH; | |
1105 | break; | |
3ff50b79 | 1106 | } |
1da177e4 LT |
1107 | |
1108 | return fatal; | |
1109 | } | |
7159039a YH |
1110 | EXPORT_SYMBOL(icmpv6_err_convert); |
1111 | ||
1da177e4 | 1112 | #ifdef CONFIG_SYSCTL |
e8243534 | 1113 | static struct ctl_table ipv6_icmp_table_template[] = { |
1da177e4 | 1114 | { |
1da177e4 | 1115 | .procname = "ratelimit", |
41a76906 | 1116 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1da177e4 LT |
1117 | .maxlen = sizeof(int), |
1118 | .mode = 0644, | |
6d9f239a | 1119 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 1120 | }, |
f8572d8f | 1121 | { }, |
1da177e4 | 1122 | }; |
760f2d01 | 1123 | |
2c8c1e72 | 1124 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
760f2d01 DL |
1125 | { |
1126 | struct ctl_table *table; | |
1127 | ||
1128 | table = kmemdup(ipv6_icmp_table_template, | |
1129 | sizeof(ipv6_icmp_table_template), | |
1130 | GFP_KERNEL); | |
5ee09105 | 1131 | |
c027aab4 | 1132 | if (table) |
5ee09105 YH |
1133 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
1134 | ||
760f2d01 DL |
1135 | return table; |
1136 | } | |
1da177e4 | 1137 | #endif |