Commit | Line | Data |
---|---|---|
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 LT |
72 | |
73 | #include <asm/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) | |
95 | ip6_update_pmtu(skb, net, info, 0, 0); | |
96 | else if (type == NDISC_REDIRECT) | |
b55b76b2 | 97 | ip6_redirect(skb, net, skb->dev->ifindex, 0); |
6d0bfe22 LC |
98 | |
99 | if (!(type & ICMPV6_INFOMSG_MASK)) | |
100 | if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) | |
101 | ping_err(skb, offset, info); | |
6f809da2 SK |
102 | } |
103 | ||
e5bbef20 | 104 | static int icmpv6_rcv(struct sk_buff *skb); |
1da177e4 | 105 | |
41135cc8 | 106 | static const struct inet6_protocol icmpv6_protocol = { |
1da177e4 | 107 | .handler = icmpv6_rcv, |
6f809da2 | 108 | .err_handler = icmpv6_err, |
8b7817f3 | 109 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1da177e4 LT |
110 | }; |
111 | ||
fdc0bde9 | 112 | static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) |
1da177e4 | 113 | { |
fdc0bde9 DL |
114 | struct sock *sk; |
115 | ||
1da177e4 LT |
116 | local_bh_disable(); |
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 | */ | |
124 | local_bh_enable(); | |
fdc0bde9 | 125 | return NULL; |
1da177e4 | 126 | } |
fdc0bde9 | 127 | return sk; |
1da177e4 LT |
128 | } |
129 | ||
405666db | 130 | static __inline__ void icmpv6_xmit_unlock(struct sock *sk) |
1da177e4 | 131 | { |
405666db | 132 | spin_unlock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
133 | } |
134 | ||
1da177e4 LT |
135 | /* |
136 | * Figure out, may we reply to this packet with icmp error. | |
137 | * | |
138 | * We do not reply, if: | |
139 | * - it was icmp error message. | |
140 | * - it is truncated, so that it is known, that protocol is ICMPV6 | |
141 | * (i.e. in the middle of some exthdr) | |
142 | * | |
143 | * --ANK (980726) | |
144 | */ | |
145 | ||
a50feda5 | 146 | static bool is_ineligible(const struct sk_buff *skb) |
1da177e4 | 147 | { |
0660e03f | 148 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
1da177e4 | 149 | int len = skb->len - ptr; |
0660e03f | 150 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
75f2811c | 151 | __be16 frag_off; |
1da177e4 LT |
152 | |
153 | if (len < 0) | |
a50feda5 | 154 | return true; |
1da177e4 | 155 | |
75f2811c | 156 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); |
1da177e4 | 157 | if (ptr < 0) |
a50feda5 | 158 | return false; |
1da177e4 LT |
159 | if (nexthdr == IPPROTO_ICMPV6) { |
160 | u8 _type, *tp; | |
161 | tp = skb_header_pointer(skb, | |
162 | ptr+offsetof(struct icmp6hdr, icmp6_type), | |
163 | sizeof(_type), &_type); | |
63159f29 | 164 | if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) |
a50feda5 | 165 | return true; |
1da177e4 | 166 | } |
a50feda5 | 167 | return false; |
1da177e4 LT |
168 | } |
169 | ||
1ab1457c YH |
170 | /* |
171 | * Check the ICMP output rate limit | |
1da177e4 | 172 | */ |
4cdf507d ED |
173 | static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, |
174 | struct flowi6 *fl6) | |
1da177e4 | 175 | { |
3b1e0a65 | 176 | struct net *net = sock_net(sk); |
4cdf507d | 177 | struct dst_entry *dst; |
92d86829 | 178 | bool res = false; |
1da177e4 LT |
179 | |
180 | /* Informational messages are not limited. */ | |
181 | if (type & ICMPV6_INFOMSG_MASK) | |
92d86829 | 182 | return true; |
1da177e4 LT |
183 | |
184 | /* Do not limit pmtu discovery, it would break it. */ | |
185 | if (type == ICMPV6_PKT_TOOBIG) | |
92d86829 | 186 | return true; |
1da177e4 | 187 | |
1ab1457c | 188 | /* |
1da177e4 LT |
189 | * Look up the output route. |
190 | * XXX: perhaps the expire for routing entries cloned by | |
191 | * this lookup should be more aggressive (not longer than timeout). | |
192 | */ | |
4c9483b2 | 193 | dst = ip6_route_output(net, sk, fl6); |
1da177e4 | 194 | if (dst->error) { |
3bd653c8 | 195 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
a11d206d | 196 | IPSTATS_MIB_OUTNOROUTES); |
1da177e4 | 197 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
92d86829 | 198 | res = true; |
1da177e4 LT |
199 | } else { |
200 | struct rt6_info *rt = (struct rt6_info *)dst; | |
9a43b709 | 201 | int tmo = net->ipv6.sysctl.icmpv6_time; |
1da177e4 LT |
202 | |
203 | /* Give more bandwidth to wider prefixes. */ | |
204 | if (rt->rt6i_dst.plen < 128) | |
205 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); | |
206 | ||
4cdf507d ED |
207 | if (icmp_global_allow()) { |
208 | struct inet_peer *peer; | |
209 | ||
210 | peer = inet_getpeer_v6(net->ipv6.peers, | |
fd0273d7 | 211 | &fl6->daddr, 1); |
4cdf507d ED |
212 | res = inet_peer_xrlim_allow(peer, tmo); |
213 | if (peer) | |
214 | inet_putpeer(peer); | |
215 | } | |
1da177e4 LT |
216 | } |
217 | dst_release(dst); | |
218 | return res; | |
219 | } | |
220 | ||
221 | /* | |
222 | * an inline helper for the "simple" if statement below | |
223 | * checks if parameter problem report is caused by an | |
1ab1457c | 224 | * unrecognized IPv6 option that has the Option Type |
1da177e4 LT |
225 | * highest-order two bits set to 10 |
226 | */ | |
227 | ||
a50feda5 | 228 | static bool opt_unrec(struct sk_buff *skb, __u32 offset) |
1da177e4 LT |
229 | { |
230 | u8 _optval, *op; | |
231 | ||
bbe735e4 | 232 | offset += skb_network_offset(skb); |
1da177e4 | 233 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
63159f29 | 234 | if (!op) |
a50feda5 | 235 | return true; |
1da177e4 LT |
236 | return (*op & 0xC0) == 0x80; |
237 | } | |
238 | ||
6d0bfe22 LC |
239 | int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
240 | struct icmp6hdr *thdr, int len) | |
1da177e4 LT |
241 | { |
242 | struct sk_buff *skb; | |
243 | struct icmp6hdr *icmp6h; | |
244 | int err = 0; | |
245 | ||
e5d08d71 | 246 | skb = skb_peek(&sk->sk_write_queue); |
63159f29 | 247 | if (!skb) |
1da177e4 LT |
248 | goto out; |
249 | ||
cc70ab26 | 250 | icmp6h = icmp6_hdr(skb); |
1da177e4 LT |
251 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
252 | icmp6h->icmp6_cksum = 0; | |
253 | ||
254 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
07f0757a | 255 | skb->csum = csum_partial(icmp6h, |
1da177e4 | 256 | sizeof(struct icmp6hdr), skb->csum); |
4c9483b2 DM |
257 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
258 | &fl6->daddr, | |
259 | len, fl6->flowi6_proto, | |
1da177e4 LT |
260 | skb->csum); |
261 | } else { | |
868c86bc | 262 | __wsum tmp_csum = 0; |
1da177e4 LT |
263 | |
264 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
265 | tmp_csum = csum_add(tmp_csum, skb->csum); | |
266 | } | |
267 | ||
07f0757a | 268 | tmp_csum = csum_partial(icmp6h, |
1da177e4 | 269 | sizeof(struct icmp6hdr), tmp_csum); |
4c9483b2 DM |
270 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
271 | &fl6->daddr, | |
272 | len, fl6->flowi6_proto, | |
868c86bc | 273 | tmp_csum); |
1da177e4 | 274 | } |
1da177e4 LT |
275 | ip6_push_pending_frames(sk); |
276 | out: | |
277 | return err; | |
278 | } | |
279 | ||
280 | struct icmpv6_msg { | |
281 | struct sk_buff *skb; | |
282 | int offset; | |
763ecff1 | 283 | uint8_t type; |
1da177e4 LT |
284 | }; |
285 | ||
286 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) | |
287 | { | |
288 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; | |
289 | struct sk_buff *org_skb = msg->skb; | |
5f92a738 | 290 | __wsum csum = 0; |
1da177e4 LT |
291 | |
292 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, | |
293 | to, len, csum); | |
294 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
763ecff1 YK |
295 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
296 | nf_ct_attach(skb, org_skb); | |
1da177e4 LT |
297 | return 0; |
298 | } | |
299 | ||
07a93626 | 300 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
79383236 MN |
301 | static void mip6_addr_swap(struct sk_buff *skb) |
302 | { | |
0660e03f | 303 | struct ipv6hdr *iph = ipv6_hdr(skb); |
79383236 MN |
304 | struct inet6_skb_parm *opt = IP6CB(skb); |
305 | struct ipv6_destopt_hao *hao; | |
306 | struct in6_addr tmp; | |
307 | int off; | |
308 | ||
309 | if (opt->dsthao) { | |
310 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); | |
311 | if (likely(off >= 0)) { | |
d56f90a7 ACM |
312 | hao = (struct ipv6_destopt_hao *) |
313 | (skb_network_header(skb) + off); | |
4e3fd7a0 AD |
314 | tmp = iph->saddr; |
315 | iph->saddr = hao->addr; | |
316 | hao->addr = tmp; | |
79383236 MN |
317 | } |
318 | } | |
319 | } | |
320 | #else | |
321 | static inline void mip6_addr_swap(struct sk_buff *skb) {} | |
322 | #endif | |
323 | ||
e8243534 | 324 | static struct dst_entry *icmpv6_route_lookup(struct net *net, |
325 | struct sk_buff *skb, | |
326 | struct sock *sk, | |
327 | struct flowi6 *fl6) | |
b42835db DM |
328 | { |
329 | struct dst_entry *dst, *dst2; | |
4c9483b2 | 330 | struct flowi6 fl2; |
b42835db DM |
331 | int err; |
332 | ||
343d60aa | 333 | err = ip6_dst_lookup(net, sk, &dst, fl6); |
b42835db DM |
334 | if (err) |
335 | return ERR_PTR(err); | |
336 | ||
337 | /* | |
338 | * We won't send icmp if the destination is known | |
339 | * anycast. | |
340 | */ | |
2647a9b0 | 341 | if (ipv6_anycast_destination(dst, &fl6->daddr)) { |
ba7a46f1 | 342 | net_dbg_ratelimited("icmp6_send: acast source\n"); |
b42835db DM |
343 | dst_release(dst); |
344 | return ERR_PTR(-EINVAL); | |
345 | } | |
346 | ||
347 | /* No need to clone since we're just using its address. */ | |
348 | dst2 = dst; | |
349 | ||
4c9483b2 | 350 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); |
452edd59 | 351 | if (!IS_ERR(dst)) { |
b42835db DM |
352 | if (dst != dst2) |
353 | return dst; | |
452edd59 DM |
354 | } else { |
355 | if (PTR_ERR(dst) == -EPERM) | |
356 | dst = NULL; | |
357 | else | |
358 | return dst; | |
b42835db DM |
359 | } |
360 | ||
4c9483b2 | 361 | err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); |
b42835db DM |
362 | if (err) |
363 | goto relookup_failed; | |
364 | ||
343d60aa | 365 | err = ip6_dst_lookup(net, sk, &dst2, &fl2); |
b42835db DM |
366 | if (err) |
367 | goto relookup_failed; | |
368 | ||
4c9483b2 | 369 | dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); |
452edd59 | 370 | if (!IS_ERR(dst2)) { |
b42835db DM |
371 | dst_release(dst); |
372 | dst = dst2; | |
452edd59 DM |
373 | } else { |
374 | err = PTR_ERR(dst2); | |
375 | if (err == -EPERM) { | |
376 | dst_release(dst); | |
377 | return dst2; | |
378 | } else | |
379 | goto relookup_failed; | |
b42835db DM |
380 | } |
381 | ||
382 | relookup_failed: | |
383 | if (dst) | |
384 | return dst; | |
385 | return ERR_PTR(err); | |
386 | } | |
387 | ||
1da177e4 LT |
388 | /* |
389 | * Send an ICMP message in response to a packet in error | |
390 | */ | |
5f5624cf | 391 | static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) |
1da177e4 | 392 | { |
c346dca1 | 393 | struct net *net = dev_net(skb->dev); |
1da177e4 | 394 | struct inet6_dev *idev = NULL; |
0660e03f | 395 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
84427d53 YH |
396 | struct sock *sk; |
397 | struct ipv6_pinfo *np; | |
b71d1d42 | 398 | const struct in6_addr *saddr = NULL; |
1da177e4 LT |
399 | struct dst_entry *dst; |
400 | struct icmp6hdr tmp_hdr; | |
4c9483b2 | 401 | struct flowi6 fl6; |
1da177e4 LT |
402 | struct icmpv6_msg msg; |
403 | int iif = 0; | |
404 | int addr_type = 0; | |
405 | int len; | |
e651f03a | 406 | int hlimit; |
1da177e4 | 407 | int err = 0; |
e110861f | 408 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 409 | |
27a884dc | 410 | if ((u8 *)hdr < skb->head || |
29a3cad5 | 411 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
1da177e4 LT |
412 | return; |
413 | ||
414 | /* | |
1ab1457c | 415 | * Make sure we respect the rules |
1da177e4 | 416 | * i.e. RFC 1885 2.4(e) |
5f5624cf | 417 | * Rule (e.1) is enforced by not using icmp6_send |
1da177e4 LT |
418 | * in any code that processes icmp errors. |
419 | */ | |
420 | addr_type = ipv6_addr_type(&hdr->daddr); | |
421 | ||
446fab59 | 422 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || |
d94c1f92 | 423 | ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) |
1da177e4 LT |
424 | saddr = &hdr->daddr; |
425 | ||
426 | /* | |
427 | * Dest addr check | |
428 | */ | |
429 | ||
9a6b4b39 | 430 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
1da177e4 | 431 | if (type != ICMPV6_PKT_TOOBIG && |
1ab1457c YH |
432 | !(type == ICMPV6_PARAMPROB && |
433 | code == ICMPV6_UNK_OPTION && | |
1da177e4 LT |
434 | (opt_unrec(skb, info)))) |
435 | return; | |
436 | ||
437 | saddr = NULL; | |
438 | } | |
439 | ||
440 | addr_type = ipv6_addr_type(&hdr->saddr); | |
441 | ||
442 | /* | |
443 | * Source addr check | |
444 | */ | |
445 | ||
842df073 | 446 | if (__ipv6_addr_needs_scope_id(addr_type)) |
1da177e4 LT |
447 | iif = skb->dev->ifindex; |
448 | ||
449 | /* | |
8de3351e YH |
450 | * Must not send error if the source does not uniquely |
451 | * identify a single node (RFC2463 Section 2.4). | |
452 | * We check unspecified / multicast addresses here, | |
453 | * and anycast addresses will be checked later. | |
1da177e4 LT |
454 | */ |
455 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { | |
4b3418fb BM |
456 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", |
457 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
458 | return; |
459 | } | |
460 | ||
1ab1457c | 461 | /* |
1da177e4 LT |
462 | * Never answer to a ICMP packet. |
463 | */ | |
464 | if (is_ineligible(skb)) { | |
4b3418fb BM |
465 | net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", |
466 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
467 | return; |
468 | } | |
469 | ||
79383236 MN |
470 | mip6_addr_swap(skb); |
471 | ||
4c9483b2 DM |
472 | memset(&fl6, 0, sizeof(fl6)); |
473 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 474 | fl6.daddr = hdr->saddr; |
1da177e4 | 475 | if (saddr) |
4e3fd7a0 | 476 | fl6.saddr = *saddr; |
e110861f | 477 | fl6.flowi6_mark = mark; |
4c9483b2 | 478 | fl6.flowi6_oif = iif; |
1958b856 DM |
479 | fl6.fl6_icmp_type = type; |
480 | fl6.fl6_icmp_code = code; | |
4c9483b2 | 481 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 482 | |
fdc0bde9 | 483 | sk = icmpv6_xmit_lock(net); |
63159f29 | 484 | if (!sk) |
405666db | 485 | return; |
e110861f | 486 | sk->sk_mark = mark; |
fdc0bde9 | 487 | np = inet6_sk(sk); |
405666db | 488 | |
4c9483b2 | 489 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
1da177e4 LT |
490 | goto out; |
491 | ||
492 | tmp_hdr.icmp6_type = type; | |
493 | tmp_hdr.icmp6_code = code; | |
494 | tmp_hdr.icmp6_cksum = 0; | |
495 | tmp_hdr.icmp6_pointer = htonl(info); | |
496 | ||
4c9483b2 DM |
497 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
498 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
499 | else if (!fl6.flowi6_oif) |
500 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 501 | |
ca254490 DA |
502 | if (!fl6.flowi6_oif) |
503 | fl6.flowi6_oif = l3mdev_master_ifindex(skb->dev); | |
504 | ||
4c9483b2 | 505 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
b42835db | 506 | if (IS_ERR(dst)) |
1da177e4 | 507 | goto out; |
8de3351e | 508 | |
5c98631c | 509 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
1da177e4 LT |
510 | |
511 | msg.skb = skb; | |
bbe735e4 | 512 | msg.offset = skb_network_offset(skb); |
763ecff1 | 513 | msg.type = type; |
1da177e4 LT |
514 | |
515 | len = skb->len - msg.offset; | |
67ba4152 | 516 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
1da177e4 | 517 | if (len < 0) { |
4b3418fb BM |
518 | net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", |
519 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
520 | goto out_dst_release; |
521 | } | |
522 | ||
cfdf7647 ED |
523 | rcu_read_lock(); |
524 | idev = __in6_dev_get(skb->dev); | |
1da177e4 LT |
525 | |
526 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, | |
527 | len + sizeof(struct icmp6hdr), | |
e651f03a | 528 | sizeof(struct icmp6hdr), hlimit, |
a2d91a09 | 529 | np->tclass, NULL, &fl6, (struct rt6_info *)dst, |
13b52cd4 | 530 | MSG_DONTWAIT, np->dontfrag); |
1da177e4 | 531 | if (err) { |
43a43b60 | 532 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 533 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
534 | } else { |
535 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
536 | len + sizeof(struct icmp6hdr)); | |
1da177e4 | 537 | } |
cfdf7647 | 538 | rcu_read_unlock(); |
1da177e4 LT |
539 | out_dst_release: |
540 | dst_release(dst); | |
541 | out: | |
405666db | 542 | icmpv6_xmit_unlock(sk); |
1da177e4 | 543 | } |
5f5624cf PS |
544 | |
545 | /* Slightly more convenient version of icmp6_send. | |
546 | */ | |
547 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) | |
548 | { | |
549 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); | |
550 | kfree_skb(skb); | |
551 | } | |
7159039a | 552 | |
1da177e4 LT |
553 | static void icmpv6_echo_reply(struct sk_buff *skb) |
554 | { | |
c346dca1 | 555 | struct net *net = dev_net(skb->dev); |
84427d53 | 556 | struct sock *sk; |
1da177e4 | 557 | struct inet6_dev *idev; |
84427d53 | 558 | struct ipv6_pinfo *np; |
b71d1d42 | 559 | const struct in6_addr *saddr = NULL; |
cc70ab26 | 560 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 | 561 | struct icmp6hdr tmp_hdr; |
4c9483b2 | 562 | struct flowi6 fl6; |
1da177e4 LT |
563 | struct icmpv6_msg msg; |
564 | struct dst_entry *dst; | |
565 | int err = 0; | |
566 | int hlimit; | |
825edac4 | 567 | u8 tclass; |
e110861f | 568 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 569 | |
0660e03f | 570 | saddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 571 | |
509aba3b | 572 | if (!ipv6_unicast_destination(skb) && |
ec35b61e | 573 | !(net->ipv6.sysctl.anycast_src_echo_reply && |
2647a9b0 | 574 | ipv6_anycast_destination(skb_dst(skb), saddr))) |
1da177e4 LT |
575 | saddr = NULL; |
576 | ||
577 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); | |
578 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; | |
579 | ||
4c9483b2 DM |
580 | memset(&fl6, 0, sizeof(fl6)); |
581 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 582 | fl6.daddr = ipv6_hdr(skb)->saddr; |
1da177e4 | 583 | if (saddr) |
4e3fd7a0 | 584 | fl6.saddr = *saddr; |
ca254490 | 585 | fl6.flowi6_oif = l3mdev_fib_oif(skb->dev); |
1958b856 | 586 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
e110861f | 587 | fl6.flowi6_mark = mark; |
4c9483b2 | 588 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 589 | |
fdc0bde9 | 590 | sk = icmpv6_xmit_lock(net); |
63159f29 | 591 | if (!sk) |
405666db | 592 | return; |
e110861f | 593 | sk->sk_mark = mark; |
fdc0bde9 | 594 | np = inet6_sk(sk); |
405666db | 595 | |
4c9483b2 DM |
596 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
597 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
598 | else if (!fl6.flowi6_oif) |
599 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 600 | |
343d60aa | 601 | err = ip6_dst_lookup(net, sk, &dst, &fl6); |
1da177e4 LT |
602 | if (err) |
603 | goto out; | |
4c9483b2 | 604 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
452edd59 | 605 | if (IS_ERR(dst)) |
e104411b | 606 | goto out; |
1da177e4 | 607 | |
5c98631c | 608 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
1da177e4 | 609 | |
cfdf7647 | 610 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
611 | |
612 | msg.skb = skb; | |
613 | msg.offset = 0; | |
763ecff1 | 614 | msg.type = ICMPV6_ECHO_REPLY; |
1da177e4 | 615 | |
825edac4 | 616 | tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 | 617 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), |
825edac4 | 618 | sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl6, |
a2d91a09 | 619 | (struct rt6_info *)dst, MSG_DONTWAIT, |
13b52cd4 | 620 | np->dontfrag); |
1da177e4 LT |
621 | |
622 | if (err) { | |
00d9d6a1 | 623 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 624 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
625 | } else { |
626 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
627 | skb->len + sizeof(struct icmp6hdr)); | |
1da177e4 | 628 | } |
1da177e4 | 629 | dst_release(dst); |
1ab1457c | 630 | out: |
405666db | 631 | icmpv6_xmit_unlock(sk); |
1da177e4 LT |
632 | } |
633 | ||
b94f1c09 | 634 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
1da177e4 | 635 | { |
41135cc8 | 636 | const struct inet6_protocol *ipprot; |
1da177e4 | 637 | int inner_offset; |
75f2811c | 638 | __be16 frag_off; |
f9242b6b | 639 | u8 nexthdr; |
7304fe46 | 640 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
641 | |
642 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
7304fe46 | 643 | goto out; |
1da177e4 LT |
644 | |
645 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; | |
646 | if (ipv6_ext_hdr(nexthdr)) { | |
647 | /* now skip over extension headers */ | |
75f2811c JG |
648 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
649 | &nexthdr, &frag_off); | |
67ba4152 | 650 | if (inner_offset < 0) |
7304fe46 | 651 | goto out; |
1da177e4 LT |
652 | } else { |
653 | inner_offset = sizeof(struct ipv6hdr); | |
654 | } | |
655 | ||
656 | /* Checkin header including 8 bytes of inner protocol header. */ | |
657 | if (!pskb_may_pull(skb, inner_offset+8)) | |
7304fe46 | 658 | goto out; |
1da177e4 | 659 | |
1da177e4 LT |
660 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
661 | Without this we will not able f.e. to make source routed | |
662 | pmtu discovery. | |
663 | Corresponding argument (opt) to notifiers is already added. | |
664 | --ANK (980726) | |
665 | */ | |
666 | ||
f9242b6b | 667 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
1da177e4 LT |
668 | if (ipprot && ipprot->err_handler) |
669 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); | |
1da177e4 | 670 | |
69d6da0b | 671 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
7304fe46 DJ |
672 | return; |
673 | ||
674 | out: | |
675 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
1da177e4 | 676 | } |
1ab1457c | 677 | |
1da177e4 LT |
678 | /* |
679 | * Handle icmp messages | |
680 | */ | |
681 | ||
e5bbef20 | 682 | static int icmpv6_rcv(struct sk_buff *skb) |
1da177e4 | 683 | { |
1da177e4 LT |
684 | struct net_device *dev = skb->dev; |
685 | struct inet6_dev *idev = __in6_dev_get(dev); | |
b71d1d42 | 686 | const struct in6_addr *saddr, *daddr; |
1da177e4 | 687 | struct icmp6hdr *hdr; |
d5fdd6ba | 688 | u8 type; |
e3e32170 | 689 | bool success = false; |
1da177e4 | 690 | |
aebcf82c | 691 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
def8b4fa | 692 | struct sec_path *sp = skb_sec_path(skb); |
8b7817f3 HX |
693 | int nh; |
694 | ||
def8b4fa | 695 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
aebcf82c HX |
696 | XFRM_STATE_ICMP)) |
697 | goto drop_no_count; | |
698 | ||
81aded24 | 699 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
8b7817f3 HX |
700 | goto drop_no_count; |
701 | ||
702 | nh = skb_network_offset(skb); | |
703 | skb_set_network_header(skb, sizeof(*hdr)); | |
704 | ||
705 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
706 | goto drop_no_count; | |
707 | ||
708 | skb_set_network_header(skb, nh); | |
709 | } | |
710 | ||
e41b5368 | 711 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
1da177e4 | 712 | |
0660e03f ACM |
713 | saddr = &ipv6_hdr(skb)->saddr; |
714 | daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 715 | |
39471ac8 | 716 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
ba7a46f1 JP |
717 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
718 | saddr, daddr); | |
39471ac8 | 719 | goto csum_error; |
1da177e4 LT |
720 | } |
721 | ||
8cf22943 HX |
722 | if (!pskb_pull(skb, sizeof(*hdr))) |
723 | goto discard_it; | |
1da177e4 | 724 | |
cc70ab26 | 725 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
726 | |
727 | type = hdr->icmp6_type; | |
728 | ||
55d43808 | 729 | ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); |
1da177e4 LT |
730 | |
731 | switch (type) { | |
732 | case ICMPV6_ECHO_REQUEST: | |
733 | icmpv6_echo_reply(skb); | |
734 | break; | |
735 | ||
736 | case ICMPV6_ECHO_REPLY: | |
e3e32170 | 737 | success = ping_rcv(skb); |
1da177e4 LT |
738 | break; |
739 | ||
740 | case ICMPV6_PKT_TOOBIG: | |
741 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update | |
742 | standard destination cache. Seems, only "advanced" | |
743 | destination cache will allow to solve this problem | |
744 | --ANK (980726) | |
745 | */ | |
746 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
747 | goto discard_it; | |
cc70ab26 | 748 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
749 | |
750 | /* | |
751 | * Drop through to notify | |
752 | */ | |
753 | ||
754 | case ICMPV6_DEST_UNREACH: | |
755 | case ICMPV6_TIME_EXCEED: | |
756 | case ICMPV6_PARAMPROB: | |
757 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
758 | break; | |
759 | ||
760 | case NDISC_ROUTER_SOLICITATION: | |
761 | case NDISC_ROUTER_ADVERTISEMENT: | |
762 | case NDISC_NEIGHBOUR_SOLICITATION: | |
763 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
764 | case NDISC_REDIRECT: | |
765 | ndisc_rcv(skb); | |
766 | break; | |
767 | ||
768 | case ICMPV6_MGM_QUERY: | |
769 | igmp6_event_query(skb); | |
770 | break; | |
771 | ||
772 | case ICMPV6_MGM_REPORT: | |
773 | igmp6_event_report(skb); | |
774 | break; | |
775 | ||
776 | case ICMPV6_MGM_REDUCTION: | |
777 | case ICMPV6_NI_QUERY: | |
778 | case ICMPV6_NI_REPLY: | |
779 | case ICMPV6_MLD2_REPORT: | |
780 | case ICMPV6_DHAAD_REQUEST: | |
781 | case ICMPV6_DHAAD_REPLY: | |
782 | case ICMPV6_MOBILE_PREFIX_SOL: | |
783 | case ICMPV6_MOBILE_PREFIX_ADV: | |
784 | break; | |
785 | ||
786 | default: | |
1da177e4 LT |
787 | /* informational */ |
788 | if (type & ICMPV6_INFOMSG_MASK) | |
789 | break; | |
790 | ||
4b3418fb BM |
791 | net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", |
792 | saddr, daddr); | |
ea85a0a2 | 793 | |
1ab1457c YH |
794 | /* |
795 | * error of unknown type. | |
796 | * must pass to upper level | |
1da177e4 LT |
797 | */ |
798 | ||
799 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
3ff50b79 SH |
800 | } |
801 | ||
e3e32170 RJ |
802 | /* until the v6 path can be better sorted assume failure and |
803 | * preserve the status quo behaviour for the rest of the paths to here | |
804 | */ | |
805 | if (success) | |
806 | consume_skb(skb); | |
807 | else | |
808 | kfree_skb(skb); | |
809 | ||
1da177e4 LT |
810 | return 0; |
811 | ||
6a5dc9e5 ED |
812 | csum_error: |
813 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); | |
1da177e4 | 814 | discard_it: |
e41b5368 | 815 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
8b7817f3 | 816 | drop_no_count: |
1da177e4 LT |
817 | kfree_skb(skb); |
818 | return 0; | |
819 | } | |
820 | ||
4c9483b2 | 821 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
95e41e93 YH |
822 | u8 type, |
823 | const struct in6_addr *saddr, | |
824 | const struct in6_addr *daddr, | |
825 | int oif) | |
826 | { | |
4c9483b2 | 827 | memset(fl6, 0, sizeof(*fl6)); |
4e3fd7a0 AD |
828 | fl6->saddr = *saddr; |
829 | fl6->daddr = *daddr; | |
67ba4152 | 830 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1958b856 DM |
831 | fl6->fl6_icmp_type = type; |
832 | fl6->fl6_icmp_code = 0; | |
4c9483b2 DM |
833 | fl6->flowi6_oif = oif; |
834 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
95e41e93 YH |
835 | } |
836 | ||
98c6d1b2 | 837 | static int __net_init icmpv6_sk_init(struct net *net) |
1da177e4 LT |
838 | { |
839 | struct sock *sk; | |
840 | int err, i, j; | |
841 | ||
98c6d1b2 DL |
842 | net->ipv6.icmp_sk = |
843 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); | |
63159f29 | 844 | if (!net->ipv6.icmp_sk) |
79c91159 DL |
845 | return -ENOMEM; |
846 | ||
6f912042 | 847 | for_each_possible_cpu(i) { |
1ed8516f DL |
848 | err = inet_ctl_sock_create(&sk, PF_INET6, |
849 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 850 | if (err < 0) { |
f3213831 | 851 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
1da177e4 LT |
852 | err); |
853 | goto fail; | |
854 | } | |
855 | ||
1ed8516f | 856 | net->ipv6.icmp_sk[i] = sk; |
5c8cafd6 | 857 | |
1da177e4 LT |
858 | /* Enough space for 2 64K ICMP packets, including |
859 | * sk_buff struct overhead. | |
860 | */ | |
87fb4b7b | 861 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1da177e4 | 862 | } |
1da177e4 LT |
863 | return 0; |
864 | ||
865 | fail: | |
5c8cafd6 | 866 | for (j = 0; j < i; j++) |
1ed8516f | 867 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
98c6d1b2 | 868 | kfree(net->ipv6.icmp_sk); |
1da177e4 LT |
869 | return err; |
870 | } | |
871 | ||
98c6d1b2 | 872 | static void __net_exit icmpv6_sk_exit(struct net *net) |
1da177e4 LT |
873 | { |
874 | int i; | |
875 | ||
6f912042 | 876 | for_each_possible_cpu(i) { |
1ed8516f | 877 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
1da177e4 | 878 | } |
98c6d1b2 DL |
879 | kfree(net->ipv6.icmp_sk); |
880 | } | |
881 | ||
8ed7edce | 882 | static struct pernet_operations icmpv6_sk_ops = { |
67ba4152 IM |
883 | .init = icmpv6_sk_init, |
884 | .exit = icmpv6_sk_exit, | |
98c6d1b2 DL |
885 | }; |
886 | ||
887 | int __init icmpv6_init(void) | |
888 | { | |
889 | int err; | |
890 | ||
891 | err = register_pernet_subsys(&icmpv6_sk_ops); | |
892 | if (err < 0) | |
893 | return err; | |
894 | ||
895 | err = -EAGAIN; | |
896 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) | |
897 | goto fail; | |
5f5624cf PS |
898 | |
899 | err = inet6_register_icmp_sender(icmp6_send); | |
900 | if (err) | |
901 | goto sender_reg_err; | |
98c6d1b2 DL |
902 | return 0; |
903 | ||
5f5624cf PS |
904 | sender_reg_err: |
905 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); | |
98c6d1b2 | 906 | fail: |
f3213831 | 907 | pr_err("Failed to register ICMP6 protocol\n"); |
98c6d1b2 DL |
908 | unregister_pernet_subsys(&icmpv6_sk_ops); |
909 | return err; | |
910 | } | |
911 | ||
8ed7edce | 912 | void icmpv6_cleanup(void) |
98c6d1b2 | 913 | { |
5f5624cf | 914 | inet6_unregister_icmp_sender(icmp6_send); |
98c6d1b2 | 915 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1da177e4 LT |
916 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
917 | } | |
918 | ||
98c6d1b2 | 919 | |
9b5b5cff | 920 | static const struct icmp6_err { |
1da177e4 LT |
921 | int err; |
922 | int fatal; | |
923 | } tab_unreach[] = { | |
924 | { /* NOROUTE */ | |
925 | .err = ENETUNREACH, | |
926 | .fatal = 0, | |
927 | }, | |
928 | { /* ADM_PROHIBITED */ | |
929 | .err = EACCES, | |
930 | .fatal = 1, | |
931 | }, | |
932 | { /* Was NOT_NEIGHBOUR, now reserved */ | |
933 | .err = EHOSTUNREACH, | |
934 | .fatal = 0, | |
935 | }, | |
936 | { /* ADDR_UNREACH */ | |
937 | .err = EHOSTUNREACH, | |
938 | .fatal = 0, | |
939 | }, | |
940 | { /* PORT_UNREACH */ | |
941 | .err = ECONNREFUSED, | |
942 | .fatal = 1, | |
943 | }, | |
61e76b17 JB |
944 | { /* POLICY_FAIL */ |
945 | .err = EACCES, | |
946 | .fatal = 1, | |
947 | }, | |
948 | { /* REJECT_ROUTE */ | |
949 | .err = EACCES, | |
950 | .fatal = 1, | |
951 | }, | |
1da177e4 LT |
952 | }; |
953 | ||
d5fdd6ba | 954 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1da177e4 LT |
955 | { |
956 | int fatal = 0; | |
957 | ||
958 | *err = EPROTO; | |
959 | ||
960 | switch (type) { | |
961 | case ICMPV6_DEST_UNREACH: | |
962 | fatal = 1; | |
61e76b17 | 963 | if (code < ARRAY_SIZE(tab_unreach)) { |
1da177e4 LT |
964 | *err = tab_unreach[code].err; |
965 | fatal = tab_unreach[code].fatal; | |
966 | } | |
967 | break; | |
968 | ||
969 | case ICMPV6_PKT_TOOBIG: | |
970 | *err = EMSGSIZE; | |
971 | break; | |
1ab1457c | 972 | |
1da177e4 LT |
973 | case ICMPV6_PARAMPROB: |
974 | *err = EPROTO; | |
975 | fatal = 1; | |
976 | break; | |
977 | ||
978 | case ICMPV6_TIME_EXCEED: | |
979 | *err = EHOSTUNREACH; | |
980 | break; | |
3ff50b79 | 981 | } |
1da177e4 LT |
982 | |
983 | return fatal; | |
984 | } | |
7159039a YH |
985 | EXPORT_SYMBOL(icmpv6_err_convert); |
986 | ||
1da177e4 | 987 | #ifdef CONFIG_SYSCTL |
e8243534 | 988 | static struct ctl_table ipv6_icmp_table_template[] = { |
1da177e4 | 989 | { |
1da177e4 | 990 | .procname = "ratelimit", |
41a76906 | 991 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1da177e4 LT |
992 | .maxlen = sizeof(int), |
993 | .mode = 0644, | |
6d9f239a | 994 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 995 | }, |
f8572d8f | 996 | { }, |
1da177e4 | 997 | }; |
760f2d01 | 998 | |
2c8c1e72 | 999 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
760f2d01 DL |
1000 | { |
1001 | struct ctl_table *table; | |
1002 | ||
1003 | table = kmemdup(ipv6_icmp_table_template, | |
1004 | sizeof(ipv6_icmp_table_template), | |
1005 | GFP_KERNEL); | |
5ee09105 | 1006 | |
c027aab4 | 1007 | if (table) |
5ee09105 YH |
1008 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
1009 | ||
760f2d01 DL |
1010 | return table; |
1011 | } | |
1da177e4 | 1012 | #endif |