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> |
1da177e4 LT |
71 | |
72 | #include <asm/uaccess.h> | |
1da177e4 | 73 | |
1da177e4 LT |
74 | /* |
75 | * The ICMP socket(s). This is the most convenient way to flow control | |
76 | * our ICMP output as well as maintain a clean interface throughout | |
77 | * all layers. All Socketless IP sends will soon be gone. | |
78 | * | |
79 | * On SMP we have one ICMP socket per-cpu. | |
80 | */ | |
98c6d1b2 DL |
81 | static inline struct sock *icmpv6_sk(struct net *net) |
82 | { | |
83 | return net->ipv6.icmp_sk[smp_processor_id()]; | |
84 | } | |
1da177e4 | 85 | |
6f809da2 SK |
86 | static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
87 | u8 type, u8 code, int offset, __be32 info) | |
88 | { | |
6d0bfe22 LC |
89 | /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ |
90 | struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); | |
6f809da2 SK |
91 | struct net *net = dev_net(skb->dev); |
92 | ||
93 | if (type == ICMPV6_PKT_TOOBIG) | |
94 | ip6_update_pmtu(skb, net, info, 0, 0); | |
95 | else if (type == NDISC_REDIRECT) | |
b55b76b2 | 96 | ip6_redirect(skb, net, skb->dev->ifindex, 0); |
6d0bfe22 LC |
97 | |
98 | if (!(type & ICMPV6_INFOMSG_MASK)) | |
99 | if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) | |
100 | ping_err(skb, offset, info); | |
6f809da2 SK |
101 | } |
102 | ||
e5bbef20 | 103 | static int icmpv6_rcv(struct sk_buff *skb); |
1da177e4 | 104 | |
41135cc8 | 105 | static const struct inet6_protocol icmpv6_protocol = { |
1da177e4 | 106 | .handler = icmpv6_rcv, |
6f809da2 | 107 | .err_handler = icmpv6_err, |
8b7817f3 | 108 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1da177e4 LT |
109 | }; |
110 | ||
fdc0bde9 | 111 | static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) |
1da177e4 | 112 | { |
fdc0bde9 DL |
113 | struct sock *sk; |
114 | ||
1da177e4 LT |
115 | local_bh_disable(); |
116 | ||
fdc0bde9 | 117 | sk = icmpv6_sk(net); |
405666db | 118 | if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { |
1da177e4 LT |
119 | /* This can happen if the output path (f.e. SIT or |
120 | * ip6ip6 tunnel) signals dst_link_failure() for an | |
121 | * outgoing ICMP6 packet. | |
122 | */ | |
123 | local_bh_enable(); | |
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 | { |
405666db | 131 | spin_unlock_bh(&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 | ||
1ab1457c YH |
169 | /* |
170 | * Check the ICMP output rate limit | |
1da177e4 | 171 | */ |
4cdf507d ED |
172 | static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, |
173 | struct flowi6 *fl6) | |
1da177e4 | 174 | { |
3b1e0a65 | 175 | struct net *net = sock_net(sk); |
4cdf507d | 176 | struct dst_entry *dst; |
92d86829 | 177 | bool res = false; |
1da177e4 LT |
178 | |
179 | /* Informational messages are not limited. */ | |
180 | if (type & ICMPV6_INFOMSG_MASK) | |
92d86829 | 181 | return true; |
1da177e4 LT |
182 | |
183 | /* Do not limit pmtu discovery, it would break it. */ | |
184 | if (type == ICMPV6_PKT_TOOBIG) | |
92d86829 | 185 | return true; |
1da177e4 | 186 | |
1ab1457c | 187 | /* |
1da177e4 LT |
188 | * Look up the output route. |
189 | * XXX: perhaps the expire for routing entries cloned by | |
190 | * this lookup should be more aggressive (not longer than timeout). | |
191 | */ | |
4c9483b2 | 192 | dst = ip6_route_output(net, sk, fl6); |
1da177e4 | 193 | if (dst->error) { |
3bd653c8 | 194 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
a11d206d | 195 | IPSTATS_MIB_OUTNOROUTES); |
1da177e4 | 196 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
92d86829 | 197 | res = true; |
1da177e4 LT |
198 | } else { |
199 | struct rt6_info *rt = (struct rt6_info *)dst; | |
9a43b709 | 200 | int tmo = net->ipv6.sysctl.icmpv6_time; |
1da177e4 LT |
201 | |
202 | /* Give more bandwidth to wider prefixes. */ | |
203 | if (rt->rt6i_dst.plen < 128) | |
204 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); | |
205 | ||
4cdf507d ED |
206 | if (icmp_global_allow()) { |
207 | struct inet_peer *peer; | |
208 | ||
209 | peer = inet_getpeer_v6(net->ipv6.peers, | |
fd0273d7 | 210 | &fl6->daddr, 1); |
4cdf507d ED |
211 | res = inet_peer_xrlim_allow(peer, tmo); |
212 | if (peer) | |
213 | inet_putpeer(peer); | |
214 | } | |
1da177e4 LT |
215 | } |
216 | dst_release(dst); | |
217 | return res; | |
218 | } | |
219 | ||
220 | /* | |
221 | * an inline helper for the "simple" if statement below | |
222 | * checks if parameter problem report is caused by an | |
1ab1457c | 223 | * unrecognized IPv6 option that has the Option Type |
1da177e4 LT |
224 | * highest-order two bits set to 10 |
225 | */ | |
226 | ||
a50feda5 | 227 | static bool opt_unrec(struct sk_buff *skb, __u32 offset) |
1da177e4 LT |
228 | { |
229 | u8 _optval, *op; | |
230 | ||
bbe735e4 | 231 | offset += skb_network_offset(skb); |
1da177e4 | 232 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
63159f29 | 233 | if (!op) |
a50feda5 | 234 | return true; |
1da177e4 LT |
235 | return (*op & 0xC0) == 0x80; |
236 | } | |
237 | ||
6d0bfe22 LC |
238 | int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
239 | struct icmp6hdr *thdr, int len) | |
1da177e4 LT |
240 | { |
241 | struct sk_buff *skb; | |
242 | struct icmp6hdr *icmp6h; | |
243 | int err = 0; | |
244 | ||
e5d08d71 | 245 | skb = skb_peek(&sk->sk_write_queue); |
63159f29 | 246 | if (!skb) |
1da177e4 LT |
247 | goto out; |
248 | ||
cc70ab26 | 249 | icmp6h = icmp6_hdr(skb); |
1da177e4 LT |
250 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
251 | icmp6h->icmp6_cksum = 0; | |
252 | ||
253 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
07f0757a | 254 | skb->csum = csum_partial(icmp6h, |
1da177e4 | 255 | sizeof(struct icmp6hdr), skb->csum); |
4c9483b2 DM |
256 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
257 | &fl6->daddr, | |
258 | len, fl6->flowi6_proto, | |
1da177e4 LT |
259 | skb->csum); |
260 | } else { | |
868c86bc | 261 | __wsum tmp_csum = 0; |
1da177e4 LT |
262 | |
263 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
264 | tmp_csum = csum_add(tmp_csum, skb->csum); | |
265 | } | |
266 | ||
07f0757a | 267 | tmp_csum = csum_partial(icmp6h, |
1da177e4 | 268 | sizeof(struct icmp6hdr), tmp_csum); |
4c9483b2 DM |
269 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
270 | &fl6->daddr, | |
271 | len, fl6->flowi6_proto, | |
868c86bc | 272 | tmp_csum); |
1da177e4 | 273 | } |
1da177e4 LT |
274 | ip6_push_pending_frames(sk); |
275 | out: | |
276 | return err; | |
277 | } | |
278 | ||
279 | struct icmpv6_msg { | |
280 | struct sk_buff *skb; | |
281 | int offset; | |
763ecff1 | 282 | uint8_t type; |
1da177e4 LT |
283 | }; |
284 | ||
285 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) | |
286 | { | |
287 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; | |
288 | struct sk_buff *org_skb = msg->skb; | |
5f92a738 | 289 | __wsum csum = 0; |
1da177e4 LT |
290 | |
291 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, | |
292 | to, len, csum); | |
293 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
763ecff1 YK |
294 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
295 | nf_ct_attach(skb, org_skb); | |
1da177e4 LT |
296 | return 0; |
297 | } | |
298 | ||
07a93626 | 299 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
79383236 MN |
300 | static void mip6_addr_swap(struct sk_buff *skb) |
301 | { | |
0660e03f | 302 | struct ipv6hdr *iph = ipv6_hdr(skb); |
79383236 MN |
303 | struct inet6_skb_parm *opt = IP6CB(skb); |
304 | struct ipv6_destopt_hao *hao; | |
305 | struct in6_addr tmp; | |
306 | int off; | |
307 | ||
308 | if (opt->dsthao) { | |
309 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); | |
310 | if (likely(off >= 0)) { | |
d56f90a7 ACM |
311 | hao = (struct ipv6_destopt_hao *) |
312 | (skb_network_header(skb) + off); | |
4e3fd7a0 AD |
313 | tmp = iph->saddr; |
314 | iph->saddr = hao->addr; | |
315 | hao->addr = tmp; | |
79383236 MN |
316 | } |
317 | } | |
318 | } | |
319 | #else | |
320 | static inline void mip6_addr_swap(struct sk_buff *skb) {} | |
321 | #endif | |
322 | ||
e8243534 | 323 | static struct dst_entry *icmpv6_route_lookup(struct net *net, |
324 | struct sk_buff *skb, | |
325 | struct sock *sk, | |
326 | struct flowi6 *fl6) | |
b42835db DM |
327 | { |
328 | struct dst_entry *dst, *dst2; | |
4c9483b2 | 329 | struct flowi6 fl2; |
b42835db DM |
330 | int err; |
331 | ||
343d60aa | 332 | err = ip6_dst_lookup(net, sk, &dst, fl6); |
b42835db DM |
333 | if (err) |
334 | return ERR_PTR(err); | |
335 | ||
336 | /* | |
337 | * We won't send icmp if the destination is known | |
338 | * anycast. | |
339 | */ | |
2647a9b0 | 340 | if (ipv6_anycast_destination(dst, &fl6->daddr)) { |
ba7a46f1 | 341 | net_dbg_ratelimited("icmp6_send: acast source\n"); |
b42835db DM |
342 | dst_release(dst); |
343 | return ERR_PTR(-EINVAL); | |
344 | } | |
345 | ||
346 | /* No need to clone since we're just using its address. */ | |
347 | dst2 = dst; | |
348 | ||
4c9483b2 | 349 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); |
452edd59 | 350 | if (!IS_ERR(dst)) { |
b42835db DM |
351 | if (dst != dst2) |
352 | return dst; | |
452edd59 DM |
353 | } else { |
354 | if (PTR_ERR(dst) == -EPERM) | |
355 | dst = NULL; | |
356 | else | |
357 | return dst; | |
b42835db DM |
358 | } |
359 | ||
4c9483b2 | 360 | err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); |
b42835db DM |
361 | if (err) |
362 | goto relookup_failed; | |
363 | ||
343d60aa | 364 | err = ip6_dst_lookup(net, sk, &dst2, &fl2); |
b42835db DM |
365 | if (err) |
366 | goto relookup_failed; | |
367 | ||
4c9483b2 | 368 | dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); |
452edd59 | 369 | if (!IS_ERR(dst2)) { |
b42835db DM |
370 | dst_release(dst); |
371 | dst = dst2; | |
452edd59 DM |
372 | } else { |
373 | err = PTR_ERR(dst2); | |
374 | if (err == -EPERM) { | |
375 | dst_release(dst); | |
376 | return dst2; | |
377 | } else | |
378 | goto relookup_failed; | |
b42835db DM |
379 | } |
380 | ||
381 | relookup_failed: | |
382 | if (dst) | |
383 | return dst; | |
384 | return ERR_PTR(err); | |
385 | } | |
386 | ||
1da177e4 LT |
387 | /* |
388 | * Send an ICMP message in response to a packet in error | |
389 | */ | |
5f5624cf | 390 | static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) |
1da177e4 | 391 | { |
c346dca1 | 392 | struct net *net = dev_net(skb->dev); |
1da177e4 | 393 | struct inet6_dev *idev = NULL; |
0660e03f | 394 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
84427d53 YH |
395 | struct sock *sk; |
396 | struct ipv6_pinfo *np; | |
b71d1d42 | 397 | const struct in6_addr *saddr = NULL; |
1da177e4 LT |
398 | struct dst_entry *dst; |
399 | struct icmp6hdr tmp_hdr; | |
4c9483b2 | 400 | struct flowi6 fl6; |
1da177e4 LT |
401 | struct icmpv6_msg msg; |
402 | int iif = 0; | |
403 | int addr_type = 0; | |
404 | int len; | |
e651f03a | 405 | int hlimit; |
1da177e4 | 406 | int err = 0; |
e110861f | 407 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 408 | |
27a884dc | 409 | if ((u8 *)hdr < skb->head || |
29a3cad5 | 410 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
1da177e4 LT |
411 | return; |
412 | ||
413 | /* | |
1ab1457c | 414 | * Make sure we respect the rules |
1da177e4 | 415 | * i.e. RFC 1885 2.4(e) |
5f5624cf | 416 | * Rule (e.1) is enforced by not using icmp6_send |
1da177e4 LT |
417 | * in any code that processes icmp errors. |
418 | */ | |
419 | addr_type = ipv6_addr_type(&hdr->daddr); | |
420 | ||
446fab59 | 421 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || |
d94c1f92 | 422 | ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) |
1da177e4 LT |
423 | saddr = &hdr->daddr; |
424 | ||
425 | /* | |
426 | * Dest addr check | |
427 | */ | |
428 | ||
9a6b4b39 | 429 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
1da177e4 | 430 | if (type != ICMPV6_PKT_TOOBIG && |
1ab1457c YH |
431 | !(type == ICMPV6_PARAMPROB && |
432 | code == ICMPV6_UNK_OPTION && | |
1da177e4 LT |
433 | (opt_unrec(skb, info)))) |
434 | return; | |
435 | ||
436 | saddr = NULL; | |
437 | } | |
438 | ||
439 | addr_type = ipv6_addr_type(&hdr->saddr); | |
440 | ||
441 | /* | |
442 | * Source addr check | |
443 | */ | |
444 | ||
842df073 | 445 | if (__ipv6_addr_needs_scope_id(addr_type)) |
1da177e4 LT |
446 | iif = skb->dev->ifindex; |
447 | ||
448 | /* | |
8de3351e YH |
449 | * Must not send error if the source does not uniquely |
450 | * identify a single node (RFC2463 Section 2.4). | |
451 | * We check unspecified / multicast addresses here, | |
452 | * and anycast addresses will be checked later. | |
1da177e4 LT |
453 | */ |
454 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { | |
ba7a46f1 | 455 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source\n"); |
1da177e4 LT |
456 | return; |
457 | } | |
458 | ||
1ab1457c | 459 | /* |
1da177e4 LT |
460 | * Never answer to a ICMP packet. |
461 | */ | |
462 | if (is_ineligible(skb)) { | |
ba7a46f1 | 463 | net_dbg_ratelimited("icmp6_send: no reply to icmp error\n"); |
1da177e4 LT |
464 | return; |
465 | } | |
466 | ||
79383236 MN |
467 | mip6_addr_swap(skb); |
468 | ||
4c9483b2 DM |
469 | memset(&fl6, 0, sizeof(fl6)); |
470 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 471 | fl6.daddr = hdr->saddr; |
1da177e4 | 472 | if (saddr) |
4e3fd7a0 | 473 | fl6.saddr = *saddr; |
e110861f | 474 | fl6.flowi6_mark = mark; |
4c9483b2 | 475 | fl6.flowi6_oif = iif; |
1958b856 DM |
476 | fl6.fl6_icmp_type = type; |
477 | fl6.fl6_icmp_code = code; | |
4c9483b2 | 478 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 479 | |
fdc0bde9 | 480 | sk = icmpv6_xmit_lock(net); |
63159f29 | 481 | if (!sk) |
405666db | 482 | return; |
e110861f | 483 | sk->sk_mark = mark; |
fdc0bde9 | 484 | np = inet6_sk(sk); |
405666db | 485 | |
4c9483b2 | 486 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
1da177e4 LT |
487 | goto out; |
488 | ||
489 | tmp_hdr.icmp6_type = type; | |
490 | tmp_hdr.icmp6_code = code; | |
491 | tmp_hdr.icmp6_cksum = 0; | |
492 | tmp_hdr.icmp6_pointer = htonl(info); | |
493 | ||
4c9483b2 DM |
494 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
495 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
496 | else if (!fl6.flowi6_oif) |
497 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 498 | |
4c9483b2 | 499 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
b42835db | 500 | if (IS_ERR(dst)) |
1da177e4 | 501 | goto out; |
8de3351e | 502 | |
5c98631c | 503 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
1da177e4 LT |
504 | |
505 | msg.skb = skb; | |
bbe735e4 | 506 | msg.offset = skb_network_offset(skb); |
763ecff1 | 507 | msg.type = type; |
1da177e4 LT |
508 | |
509 | len = skb->len - msg.offset; | |
67ba4152 | 510 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
1da177e4 | 511 | if (len < 0) { |
ba7a46f1 | 512 | net_dbg_ratelimited("icmp: len problem\n"); |
1da177e4 LT |
513 | goto out_dst_release; |
514 | } | |
515 | ||
cfdf7647 ED |
516 | rcu_read_lock(); |
517 | idev = __in6_dev_get(skb->dev); | |
1da177e4 LT |
518 | |
519 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, | |
520 | len + sizeof(struct icmp6hdr), | |
e651f03a | 521 | sizeof(struct icmp6hdr), hlimit, |
a2d91a09 | 522 | np->tclass, NULL, &fl6, (struct rt6_info *)dst, |
13b52cd4 | 523 | MSG_DONTWAIT, np->dontfrag); |
1da177e4 | 524 | if (err) { |
43a43b60 | 525 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 526 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
527 | } else { |
528 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
529 | len + sizeof(struct icmp6hdr)); | |
1da177e4 | 530 | } |
cfdf7647 | 531 | rcu_read_unlock(); |
1da177e4 LT |
532 | out_dst_release: |
533 | dst_release(dst); | |
534 | out: | |
405666db | 535 | icmpv6_xmit_unlock(sk); |
1da177e4 | 536 | } |
5f5624cf PS |
537 | |
538 | /* Slightly more convenient version of icmp6_send. | |
539 | */ | |
540 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) | |
541 | { | |
542 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); | |
543 | kfree_skb(skb); | |
544 | } | |
7159039a | 545 | |
1da177e4 LT |
546 | static void icmpv6_echo_reply(struct sk_buff *skb) |
547 | { | |
c346dca1 | 548 | struct net *net = dev_net(skb->dev); |
84427d53 | 549 | struct sock *sk; |
1da177e4 | 550 | struct inet6_dev *idev; |
84427d53 | 551 | struct ipv6_pinfo *np; |
b71d1d42 | 552 | const struct in6_addr *saddr = NULL; |
cc70ab26 | 553 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 | 554 | struct icmp6hdr tmp_hdr; |
4c9483b2 | 555 | struct flowi6 fl6; |
1da177e4 LT |
556 | struct icmpv6_msg msg; |
557 | struct dst_entry *dst; | |
558 | int err = 0; | |
559 | int hlimit; | |
825edac4 | 560 | u8 tclass; |
e110861f | 561 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 562 | |
0660e03f | 563 | saddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 564 | |
509aba3b | 565 | if (!ipv6_unicast_destination(skb) && |
ec35b61e | 566 | !(net->ipv6.sysctl.anycast_src_echo_reply && |
2647a9b0 | 567 | ipv6_anycast_destination(skb_dst(skb), saddr))) |
1da177e4 LT |
568 | saddr = NULL; |
569 | ||
570 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); | |
571 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; | |
572 | ||
4c9483b2 DM |
573 | memset(&fl6, 0, sizeof(fl6)); |
574 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 575 | fl6.daddr = ipv6_hdr(skb)->saddr; |
1da177e4 | 576 | if (saddr) |
4e3fd7a0 | 577 | fl6.saddr = *saddr; |
4c9483b2 | 578 | fl6.flowi6_oif = skb->dev->ifindex; |
1958b856 | 579 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
e110861f | 580 | fl6.flowi6_mark = mark; |
4c9483b2 | 581 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 582 | |
fdc0bde9 | 583 | sk = icmpv6_xmit_lock(net); |
63159f29 | 584 | if (!sk) |
405666db | 585 | return; |
e110861f | 586 | sk->sk_mark = mark; |
fdc0bde9 | 587 | np = inet6_sk(sk); |
405666db | 588 | |
4c9483b2 DM |
589 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
590 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
591 | else if (!fl6.flowi6_oif) |
592 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 593 | |
343d60aa | 594 | err = ip6_dst_lookup(net, sk, &dst, &fl6); |
1da177e4 LT |
595 | if (err) |
596 | goto out; | |
4c9483b2 | 597 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
452edd59 | 598 | if (IS_ERR(dst)) |
e104411b | 599 | goto out; |
1da177e4 | 600 | |
5c98631c | 601 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
1da177e4 | 602 | |
cfdf7647 | 603 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
604 | |
605 | msg.skb = skb; | |
606 | msg.offset = 0; | |
763ecff1 | 607 | msg.type = ICMPV6_ECHO_REPLY; |
1da177e4 | 608 | |
825edac4 | 609 | tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 | 610 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), |
825edac4 | 611 | sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl6, |
a2d91a09 | 612 | (struct rt6_info *)dst, MSG_DONTWAIT, |
13b52cd4 | 613 | np->dontfrag); |
1da177e4 LT |
614 | |
615 | if (err) { | |
00d9d6a1 | 616 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 617 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
618 | } else { |
619 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
620 | skb->len + sizeof(struct icmp6hdr)); | |
1da177e4 | 621 | } |
1da177e4 | 622 | dst_release(dst); |
1ab1457c | 623 | out: |
405666db | 624 | icmpv6_xmit_unlock(sk); |
1da177e4 LT |
625 | } |
626 | ||
b94f1c09 | 627 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
1da177e4 | 628 | { |
41135cc8 | 629 | const struct inet6_protocol *ipprot; |
1da177e4 | 630 | int inner_offset; |
75f2811c | 631 | __be16 frag_off; |
f9242b6b | 632 | u8 nexthdr; |
7304fe46 | 633 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
634 | |
635 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
7304fe46 | 636 | goto out; |
1da177e4 LT |
637 | |
638 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; | |
639 | if (ipv6_ext_hdr(nexthdr)) { | |
640 | /* now skip over extension headers */ | |
75f2811c JG |
641 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
642 | &nexthdr, &frag_off); | |
67ba4152 | 643 | if (inner_offset < 0) |
7304fe46 | 644 | goto out; |
1da177e4 LT |
645 | } else { |
646 | inner_offset = sizeof(struct ipv6hdr); | |
647 | } | |
648 | ||
649 | /* Checkin header including 8 bytes of inner protocol header. */ | |
650 | if (!pskb_may_pull(skb, inner_offset+8)) | |
7304fe46 | 651 | goto out; |
1da177e4 | 652 | |
1da177e4 LT |
653 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
654 | Without this we will not able f.e. to make source routed | |
655 | pmtu discovery. | |
656 | Corresponding argument (opt) to notifiers is already added. | |
657 | --ANK (980726) | |
658 | */ | |
659 | ||
f9242b6b | 660 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
1da177e4 LT |
661 | if (ipprot && ipprot->err_handler) |
662 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); | |
1da177e4 | 663 | |
69d6da0b | 664 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
7304fe46 DJ |
665 | return; |
666 | ||
667 | out: | |
668 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
1da177e4 | 669 | } |
1ab1457c | 670 | |
1da177e4 LT |
671 | /* |
672 | * Handle icmp messages | |
673 | */ | |
674 | ||
e5bbef20 | 675 | static int icmpv6_rcv(struct sk_buff *skb) |
1da177e4 | 676 | { |
1da177e4 LT |
677 | struct net_device *dev = skb->dev; |
678 | struct inet6_dev *idev = __in6_dev_get(dev); | |
b71d1d42 | 679 | const struct in6_addr *saddr, *daddr; |
1da177e4 | 680 | struct icmp6hdr *hdr; |
d5fdd6ba | 681 | u8 type; |
e3e32170 | 682 | bool success = false; |
1da177e4 | 683 | |
aebcf82c | 684 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
def8b4fa | 685 | struct sec_path *sp = skb_sec_path(skb); |
8b7817f3 HX |
686 | int nh; |
687 | ||
def8b4fa | 688 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
aebcf82c HX |
689 | XFRM_STATE_ICMP)) |
690 | goto drop_no_count; | |
691 | ||
81aded24 | 692 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
8b7817f3 HX |
693 | goto drop_no_count; |
694 | ||
695 | nh = skb_network_offset(skb); | |
696 | skb_set_network_header(skb, sizeof(*hdr)); | |
697 | ||
698 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
699 | goto drop_no_count; | |
700 | ||
701 | skb_set_network_header(skb, nh); | |
702 | } | |
703 | ||
e41b5368 | 704 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
1da177e4 | 705 | |
0660e03f ACM |
706 | saddr = &ipv6_hdr(skb)->saddr; |
707 | daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 708 | |
39471ac8 | 709 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
ba7a46f1 JP |
710 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
711 | saddr, daddr); | |
39471ac8 | 712 | goto csum_error; |
1da177e4 LT |
713 | } |
714 | ||
8cf22943 HX |
715 | if (!pskb_pull(skb, sizeof(*hdr))) |
716 | goto discard_it; | |
1da177e4 | 717 | |
cc70ab26 | 718 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
719 | |
720 | type = hdr->icmp6_type; | |
721 | ||
55d43808 | 722 | ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); |
1da177e4 LT |
723 | |
724 | switch (type) { | |
725 | case ICMPV6_ECHO_REQUEST: | |
726 | icmpv6_echo_reply(skb); | |
727 | break; | |
728 | ||
729 | case ICMPV6_ECHO_REPLY: | |
e3e32170 | 730 | success = ping_rcv(skb); |
1da177e4 LT |
731 | break; |
732 | ||
733 | case ICMPV6_PKT_TOOBIG: | |
734 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update | |
735 | standard destination cache. Seems, only "advanced" | |
736 | destination cache will allow to solve this problem | |
737 | --ANK (980726) | |
738 | */ | |
739 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
740 | goto discard_it; | |
cc70ab26 | 741 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
742 | |
743 | /* | |
744 | * Drop through to notify | |
745 | */ | |
746 | ||
747 | case ICMPV6_DEST_UNREACH: | |
748 | case ICMPV6_TIME_EXCEED: | |
749 | case ICMPV6_PARAMPROB: | |
750 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
751 | break; | |
752 | ||
753 | case NDISC_ROUTER_SOLICITATION: | |
754 | case NDISC_ROUTER_ADVERTISEMENT: | |
755 | case NDISC_NEIGHBOUR_SOLICITATION: | |
756 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
757 | case NDISC_REDIRECT: | |
758 | ndisc_rcv(skb); | |
759 | break; | |
760 | ||
761 | case ICMPV6_MGM_QUERY: | |
762 | igmp6_event_query(skb); | |
763 | break; | |
764 | ||
765 | case ICMPV6_MGM_REPORT: | |
766 | igmp6_event_report(skb); | |
767 | break; | |
768 | ||
769 | case ICMPV6_MGM_REDUCTION: | |
770 | case ICMPV6_NI_QUERY: | |
771 | case ICMPV6_NI_REPLY: | |
772 | case ICMPV6_MLD2_REPORT: | |
773 | case ICMPV6_DHAAD_REQUEST: | |
774 | case ICMPV6_DHAAD_REPLY: | |
775 | case ICMPV6_MOBILE_PREFIX_SOL: | |
776 | case ICMPV6_MOBILE_PREFIX_ADV: | |
777 | break; | |
778 | ||
779 | default: | |
1da177e4 LT |
780 | /* informational */ |
781 | if (type & ICMPV6_INFOMSG_MASK) | |
782 | break; | |
783 | ||
ba7a46f1 | 784 | net_dbg_ratelimited("icmpv6: msg of unknown type\n"); |
ea85a0a2 | 785 | |
1ab1457c YH |
786 | /* |
787 | * error of unknown type. | |
788 | * must pass to upper level | |
1da177e4 LT |
789 | */ |
790 | ||
791 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
3ff50b79 SH |
792 | } |
793 | ||
e3e32170 RJ |
794 | /* until the v6 path can be better sorted assume failure and |
795 | * preserve the status quo behaviour for the rest of the paths to here | |
796 | */ | |
797 | if (success) | |
798 | consume_skb(skb); | |
799 | else | |
800 | kfree_skb(skb); | |
801 | ||
1da177e4 LT |
802 | return 0; |
803 | ||
6a5dc9e5 ED |
804 | csum_error: |
805 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); | |
1da177e4 | 806 | discard_it: |
e41b5368 | 807 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
8b7817f3 | 808 | drop_no_count: |
1da177e4 LT |
809 | kfree_skb(skb); |
810 | return 0; | |
811 | } | |
812 | ||
4c9483b2 | 813 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
95e41e93 YH |
814 | u8 type, |
815 | const struct in6_addr *saddr, | |
816 | const struct in6_addr *daddr, | |
817 | int oif) | |
818 | { | |
4c9483b2 | 819 | memset(fl6, 0, sizeof(*fl6)); |
4e3fd7a0 AD |
820 | fl6->saddr = *saddr; |
821 | fl6->daddr = *daddr; | |
67ba4152 | 822 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1958b856 DM |
823 | fl6->fl6_icmp_type = type; |
824 | fl6->fl6_icmp_code = 0; | |
4c9483b2 DM |
825 | fl6->flowi6_oif = oif; |
826 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
95e41e93 YH |
827 | } |
828 | ||
640c41c7 | 829 | /* |
b7e729c4 | 830 | * Special lock-class for __icmpv6_sk: |
640c41c7 IM |
831 | */ |
832 | static struct lock_class_key icmpv6_socket_sk_dst_lock_key; | |
833 | ||
98c6d1b2 | 834 | static int __net_init icmpv6_sk_init(struct net *net) |
1da177e4 LT |
835 | { |
836 | struct sock *sk; | |
837 | int err, i, j; | |
838 | ||
98c6d1b2 DL |
839 | net->ipv6.icmp_sk = |
840 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); | |
63159f29 | 841 | if (!net->ipv6.icmp_sk) |
79c91159 DL |
842 | return -ENOMEM; |
843 | ||
6f912042 | 844 | for_each_possible_cpu(i) { |
1ed8516f DL |
845 | err = inet_ctl_sock_create(&sk, PF_INET6, |
846 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 847 | if (err < 0) { |
f3213831 | 848 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
1da177e4 LT |
849 | err); |
850 | goto fail; | |
851 | } | |
852 | ||
1ed8516f | 853 | net->ipv6.icmp_sk[i] = sk; |
5c8cafd6 | 854 | |
640c41c7 IM |
855 | /* |
856 | * Split off their lock-class, because sk->sk_dst_lock | |
857 | * gets used from softirqs, which is safe for | |
b7e729c4 | 858 | * __icmpv6_sk (because those never get directly used |
640c41c7 IM |
859 | * via userspace syscalls), but unsafe for normal sockets. |
860 | */ | |
861 | lockdep_set_class(&sk->sk_dst_lock, | |
862 | &icmpv6_socket_sk_dst_lock_key); | |
1da177e4 LT |
863 | |
864 | /* Enough space for 2 64K ICMP packets, including | |
865 | * sk_buff struct overhead. | |
866 | */ | |
87fb4b7b | 867 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1da177e4 | 868 | } |
1da177e4 LT |
869 | return 0; |
870 | ||
871 | fail: | |
5c8cafd6 | 872 | for (j = 0; j < i; j++) |
1ed8516f | 873 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
98c6d1b2 | 874 | kfree(net->ipv6.icmp_sk); |
1da177e4 LT |
875 | return err; |
876 | } | |
877 | ||
98c6d1b2 | 878 | static void __net_exit icmpv6_sk_exit(struct net *net) |
1da177e4 LT |
879 | { |
880 | int i; | |
881 | ||
6f912042 | 882 | for_each_possible_cpu(i) { |
1ed8516f | 883 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
1da177e4 | 884 | } |
98c6d1b2 DL |
885 | kfree(net->ipv6.icmp_sk); |
886 | } | |
887 | ||
8ed7edce | 888 | static struct pernet_operations icmpv6_sk_ops = { |
67ba4152 IM |
889 | .init = icmpv6_sk_init, |
890 | .exit = icmpv6_sk_exit, | |
98c6d1b2 DL |
891 | }; |
892 | ||
893 | int __init icmpv6_init(void) | |
894 | { | |
895 | int err; | |
896 | ||
897 | err = register_pernet_subsys(&icmpv6_sk_ops); | |
898 | if (err < 0) | |
899 | return err; | |
900 | ||
901 | err = -EAGAIN; | |
902 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) | |
903 | goto fail; | |
5f5624cf PS |
904 | |
905 | err = inet6_register_icmp_sender(icmp6_send); | |
906 | if (err) | |
907 | goto sender_reg_err; | |
98c6d1b2 DL |
908 | return 0; |
909 | ||
5f5624cf PS |
910 | sender_reg_err: |
911 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); | |
98c6d1b2 | 912 | fail: |
f3213831 | 913 | pr_err("Failed to register ICMP6 protocol\n"); |
98c6d1b2 DL |
914 | unregister_pernet_subsys(&icmpv6_sk_ops); |
915 | return err; | |
916 | } | |
917 | ||
8ed7edce | 918 | void icmpv6_cleanup(void) |
98c6d1b2 | 919 | { |
5f5624cf | 920 | inet6_unregister_icmp_sender(icmp6_send); |
98c6d1b2 | 921 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1da177e4 LT |
922 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
923 | } | |
924 | ||
98c6d1b2 | 925 | |
9b5b5cff | 926 | static const struct icmp6_err { |
1da177e4 LT |
927 | int err; |
928 | int fatal; | |
929 | } tab_unreach[] = { | |
930 | { /* NOROUTE */ | |
931 | .err = ENETUNREACH, | |
932 | .fatal = 0, | |
933 | }, | |
934 | { /* ADM_PROHIBITED */ | |
935 | .err = EACCES, | |
936 | .fatal = 1, | |
937 | }, | |
938 | { /* Was NOT_NEIGHBOUR, now reserved */ | |
939 | .err = EHOSTUNREACH, | |
940 | .fatal = 0, | |
941 | }, | |
942 | { /* ADDR_UNREACH */ | |
943 | .err = EHOSTUNREACH, | |
944 | .fatal = 0, | |
945 | }, | |
946 | { /* PORT_UNREACH */ | |
947 | .err = ECONNREFUSED, | |
948 | .fatal = 1, | |
949 | }, | |
61e76b17 JB |
950 | { /* POLICY_FAIL */ |
951 | .err = EACCES, | |
952 | .fatal = 1, | |
953 | }, | |
954 | { /* REJECT_ROUTE */ | |
955 | .err = EACCES, | |
956 | .fatal = 1, | |
957 | }, | |
1da177e4 LT |
958 | }; |
959 | ||
d5fdd6ba | 960 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1da177e4 LT |
961 | { |
962 | int fatal = 0; | |
963 | ||
964 | *err = EPROTO; | |
965 | ||
966 | switch (type) { | |
967 | case ICMPV6_DEST_UNREACH: | |
968 | fatal = 1; | |
61e76b17 | 969 | if (code < ARRAY_SIZE(tab_unreach)) { |
1da177e4 LT |
970 | *err = tab_unreach[code].err; |
971 | fatal = tab_unreach[code].fatal; | |
972 | } | |
973 | break; | |
974 | ||
975 | case ICMPV6_PKT_TOOBIG: | |
976 | *err = EMSGSIZE; | |
977 | break; | |
1ab1457c | 978 | |
1da177e4 LT |
979 | case ICMPV6_PARAMPROB: |
980 | *err = EPROTO; | |
981 | fatal = 1; | |
982 | break; | |
983 | ||
984 | case ICMPV6_TIME_EXCEED: | |
985 | *err = EHOSTUNREACH; | |
986 | break; | |
3ff50b79 | 987 | } |
1da177e4 LT |
988 | |
989 | return fatal; | |
990 | } | |
7159039a YH |
991 | EXPORT_SYMBOL(icmpv6_err_convert); |
992 | ||
1da177e4 | 993 | #ifdef CONFIG_SYSCTL |
e8243534 | 994 | static struct ctl_table ipv6_icmp_table_template[] = { |
1da177e4 | 995 | { |
1da177e4 | 996 | .procname = "ratelimit", |
41a76906 | 997 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1da177e4 LT |
998 | .maxlen = sizeof(int), |
999 | .mode = 0644, | |
6d9f239a | 1000 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 1001 | }, |
f8572d8f | 1002 | { }, |
1da177e4 | 1003 | }; |
760f2d01 | 1004 | |
2c8c1e72 | 1005 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
760f2d01 DL |
1006 | { |
1007 | struct ctl_table *table; | |
1008 | ||
1009 | table = kmemdup(ipv6_icmp_table_template, | |
1010 | sizeof(ipv6_icmp_table_template), | |
1011 | GFP_KERNEL); | |
5ee09105 | 1012 | |
c027aab4 | 1013 | if (table) |
5ee09105 YH |
1014 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
1015 | ||
760f2d01 DL |
1016 | return table; |
1017 | } | |
1da177e4 | 1018 | #endif |