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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 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) | |
dcb94b88 | 101 | ping_err(skb, offset, ntohl(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 | */ | |
b1cadc1a ED |
391 | static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, |
392 | const struct in6_addr *force_saddr) | |
1da177e4 | 393 | { |
c346dca1 | 394 | struct net *net = dev_net(skb->dev); |
1da177e4 | 395 | struct inet6_dev *idev = NULL; |
0660e03f | 396 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
84427d53 YH |
397 | struct sock *sk; |
398 | struct ipv6_pinfo *np; | |
b71d1d42 | 399 | const struct in6_addr *saddr = NULL; |
1da177e4 LT |
400 | struct dst_entry *dst; |
401 | struct icmp6hdr tmp_hdr; | |
4c9483b2 | 402 | struct flowi6 fl6; |
1da177e4 | 403 | struct icmpv6_msg msg; |
c14ac945 | 404 | struct sockcm_cookie sockc_unused = {0}; |
26879da5 | 405 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
406 | int iif = 0; |
407 | int addr_type = 0; | |
408 | int len; | |
1da177e4 | 409 | int err = 0; |
e110861f | 410 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 411 | |
27a884dc | 412 | if ((u8 *)hdr < skb->head || |
29a3cad5 | 413 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
1da177e4 LT |
414 | return; |
415 | ||
416 | /* | |
1ab1457c | 417 | * Make sure we respect the rules |
1da177e4 | 418 | * i.e. RFC 1885 2.4(e) |
5f5624cf | 419 | * Rule (e.1) is enforced by not using icmp6_send |
1da177e4 LT |
420 | * in any code that processes icmp errors. |
421 | */ | |
422 | addr_type = ipv6_addr_type(&hdr->daddr); | |
423 | ||
446fab59 | 424 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || |
d94c1f92 | 425 | ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) |
1da177e4 LT |
426 | saddr = &hdr->daddr; |
427 | ||
428 | /* | |
429 | * Dest addr check | |
430 | */ | |
431 | ||
9a6b4b39 | 432 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
1da177e4 | 433 | if (type != ICMPV6_PKT_TOOBIG && |
1ab1457c YH |
434 | !(type == ICMPV6_PARAMPROB && |
435 | code == ICMPV6_UNK_OPTION && | |
1da177e4 LT |
436 | (opt_unrec(skb, info)))) |
437 | return; | |
438 | ||
439 | saddr = NULL; | |
440 | } | |
441 | ||
442 | addr_type = ipv6_addr_type(&hdr->saddr); | |
443 | ||
444 | /* | |
445 | * Source addr check | |
446 | */ | |
447 | ||
842df073 | 448 | if (__ipv6_addr_needs_scope_id(addr_type)) |
1da177e4 | 449 | iif = skb->dev->ifindex; |
1d2f7b2d DA |
450 | else |
451 | iif = l3mdev_master_ifindex(skb->dev); | |
1da177e4 LT |
452 | |
453 | /* | |
8de3351e YH |
454 | * Must not send error if the source does not uniquely |
455 | * identify a single node (RFC2463 Section 2.4). | |
456 | * We check unspecified / multicast addresses here, | |
457 | * and anycast addresses will be checked later. | |
1da177e4 LT |
458 | */ |
459 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { | |
4b3418fb BM |
460 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", |
461 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
462 | return; |
463 | } | |
464 | ||
1ab1457c | 465 | /* |
1da177e4 LT |
466 | * Never answer to a ICMP packet. |
467 | */ | |
468 | if (is_ineligible(skb)) { | |
4b3418fb BM |
469 | net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", |
470 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
471 | return; |
472 | } | |
473 | ||
79383236 MN |
474 | mip6_addr_swap(skb); |
475 | ||
4c9483b2 DM |
476 | memset(&fl6, 0, sizeof(fl6)); |
477 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 478 | fl6.daddr = hdr->saddr; |
b1cadc1a ED |
479 | if (force_saddr) |
480 | saddr = force_saddr; | |
1da177e4 | 481 | if (saddr) |
4e3fd7a0 | 482 | fl6.saddr = *saddr; |
e110861f | 483 | fl6.flowi6_mark = mark; |
4c9483b2 | 484 | fl6.flowi6_oif = iif; |
1958b856 DM |
485 | fl6.fl6_icmp_type = type; |
486 | fl6.fl6_icmp_code = code; | |
4c9483b2 | 487 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 488 | |
fdc0bde9 | 489 | sk = icmpv6_xmit_lock(net); |
63159f29 | 490 | if (!sk) |
405666db | 491 | return; |
e110861f | 492 | sk->sk_mark = mark; |
fdc0bde9 | 493 | np = inet6_sk(sk); |
405666db | 494 | |
4c9483b2 | 495 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
1da177e4 LT |
496 | goto out; |
497 | ||
498 | tmp_hdr.icmp6_type = type; | |
499 | tmp_hdr.icmp6_code = code; | |
500 | tmp_hdr.icmp6_cksum = 0; | |
501 | tmp_hdr.icmp6_pointer = htonl(info); | |
502 | ||
4c9483b2 DM |
503 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
504 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
505 | else if (!fl6.flowi6_oif) |
506 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 507 | |
38b7097b HFS |
508 | ipc6.tclass = np->tclass; |
509 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); | |
510 | ||
4c9483b2 | 511 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
b42835db | 512 | if (IS_ERR(dst)) |
1da177e4 | 513 | goto out; |
8de3351e | 514 | |
26879da5 | 515 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
26879da5 WW |
516 | ipc6.dontfrag = np->dontfrag; |
517 | ipc6.opt = NULL; | |
1da177e4 LT |
518 | |
519 | msg.skb = skb; | |
bbe735e4 | 520 | msg.offset = skb_network_offset(skb); |
763ecff1 | 521 | msg.type = type; |
1da177e4 LT |
522 | |
523 | len = skb->len - msg.offset; | |
67ba4152 | 524 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
1da177e4 | 525 | if (len < 0) { |
4b3418fb BM |
526 | net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", |
527 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
528 | goto out_dst_release; |
529 | } | |
530 | ||
cfdf7647 ED |
531 | rcu_read_lock(); |
532 | idev = __in6_dev_get(skb->dev); | |
1da177e4 LT |
533 | |
534 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, | |
535 | len + sizeof(struct icmp6hdr), | |
26879da5 WW |
536 | sizeof(struct icmp6hdr), |
537 | &ipc6, &fl6, (struct rt6_info *)dst, | |
538 | MSG_DONTWAIT, &sockc_unused); | |
1da177e4 | 539 | if (err) { |
43a43b60 | 540 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 541 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
542 | } else { |
543 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
544 | len + sizeof(struct icmp6hdr)); | |
1da177e4 | 545 | } |
cfdf7647 | 546 | rcu_read_unlock(); |
1da177e4 LT |
547 | out_dst_release: |
548 | dst_release(dst); | |
549 | out: | |
405666db | 550 | icmpv6_xmit_unlock(sk); |
1da177e4 | 551 | } |
5f5624cf PS |
552 | |
553 | /* Slightly more convenient version of icmp6_send. | |
554 | */ | |
555 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) | |
556 | { | |
b1cadc1a | 557 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); |
5f5624cf PS |
558 | kfree_skb(skb); |
559 | } | |
7159039a | 560 | |
5fbba8ac ED |
561 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH |
562 | * if sufficient data bytes are available | |
563 | * @nhs is the size of the tunnel header(s) : | |
564 | * Either an IPv4 header for SIT encap | |
565 | * an IPv4 header + GRE header for GRE encap | |
566 | */ | |
20e1954f ED |
567 | int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, |
568 | unsigned int data_len) | |
5fbba8ac | 569 | { |
2d7a3b27 | 570 | struct in6_addr temp_saddr; |
5fbba8ac ED |
571 | struct rt6_info *rt; |
572 | struct sk_buff *skb2; | |
20e1954f | 573 | u32 info = 0; |
5fbba8ac ED |
574 | |
575 | if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) | |
576 | return 1; | |
577 | ||
20e1954f ED |
578 | /* RFC 4884 (partial) support for ICMP extensions */ |
579 | if (data_len < 128 || (data_len & 7) || skb->len < data_len) | |
580 | data_len = 0; | |
581 | ||
582 | skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); | |
5fbba8ac ED |
583 | |
584 | if (!skb2) | |
585 | return 1; | |
586 | ||
587 | skb_dst_drop(skb2); | |
588 | skb_pull(skb2, nhs); | |
589 | skb_reset_network_header(skb2); | |
590 | ||
591 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); | |
592 | ||
593 | if (rt && rt->dst.dev) | |
594 | skb2->dev = rt->dst.dev; | |
595 | ||
2d7a3b27 | 596 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); |
20e1954f ED |
597 | |
598 | if (data_len) { | |
599 | /* RFC 4884 (partial) support : | |
600 | * insert 0 padding at the end, before the extensions | |
601 | */ | |
602 | __skb_push(skb2, nhs); | |
603 | skb_reset_network_header(skb2); | |
604 | memmove(skb2->data, skb2->data + nhs, data_len - nhs); | |
605 | memset(skb2->data + data_len - nhs, 0, nhs); | |
606 | /* RFC 4884 4.5 : Length is measured in 64-bit words, | |
607 | * and stored in reserved[0] | |
608 | */ | |
609 | info = (data_len/8) << 24; | |
610 | } | |
2d7a3b27 ED |
611 | if (type == ICMP_TIME_EXCEEDED) |
612 | icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
20e1954f | 613 | info, &temp_saddr); |
2d7a3b27 ED |
614 | else |
615 | icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, | |
20e1954f | 616 | info, &temp_saddr); |
5fbba8ac ED |
617 | if (rt) |
618 | ip6_rt_put(rt); | |
619 | ||
620 | kfree_skb(skb2); | |
621 | ||
622 | return 0; | |
623 | } | |
624 | EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); | |
625 | ||
1da177e4 LT |
626 | static void icmpv6_echo_reply(struct sk_buff *skb) |
627 | { | |
c346dca1 | 628 | struct net *net = dev_net(skb->dev); |
84427d53 | 629 | struct sock *sk; |
1da177e4 | 630 | struct inet6_dev *idev; |
84427d53 | 631 | struct ipv6_pinfo *np; |
b71d1d42 | 632 | const struct in6_addr *saddr = NULL; |
cc70ab26 | 633 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 | 634 | struct icmp6hdr tmp_hdr; |
4c9483b2 | 635 | struct flowi6 fl6; |
1da177e4 LT |
636 | struct icmpv6_msg msg; |
637 | struct dst_entry *dst; | |
26879da5 | 638 | struct ipcm6_cookie ipc6; |
1da177e4 | 639 | int err = 0; |
e110861f | 640 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
c14ac945 | 641 | struct sockcm_cookie sockc_unused = {0}; |
1da177e4 | 642 | |
0660e03f | 643 | saddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 644 | |
509aba3b | 645 | if (!ipv6_unicast_destination(skb) && |
ec35b61e | 646 | !(net->ipv6.sysctl.anycast_src_echo_reply && |
2647a9b0 | 647 | ipv6_anycast_destination(skb_dst(skb), saddr))) |
1da177e4 LT |
648 | saddr = NULL; |
649 | ||
650 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); | |
651 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; | |
652 | ||
4c9483b2 DM |
653 | memset(&fl6, 0, sizeof(fl6)); |
654 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 655 | fl6.daddr = ipv6_hdr(skb)->saddr; |
1da177e4 | 656 | if (saddr) |
4e3fd7a0 | 657 | fl6.saddr = *saddr; |
9ff74384 | 658 | fl6.flowi6_oif = skb->dev->ifindex; |
1958b856 | 659 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
e110861f | 660 | fl6.flowi6_mark = mark; |
4c9483b2 | 661 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 662 | |
fdc0bde9 | 663 | sk = icmpv6_xmit_lock(net); |
63159f29 | 664 | if (!sk) |
405666db | 665 | return; |
e110861f | 666 | sk->sk_mark = mark; |
fdc0bde9 | 667 | np = inet6_sk(sk); |
405666db | 668 | |
4c9483b2 DM |
669 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
670 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
671 | else if (!fl6.flowi6_oif) |
672 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 673 | |
343d60aa | 674 | err = ip6_dst_lookup(net, sk, &dst, &fl6); |
1da177e4 LT |
675 | if (err) |
676 | goto out; | |
4c9483b2 | 677 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
452edd59 | 678 | if (IS_ERR(dst)) |
e104411b | 679 | goto out; |
1da177e4 | 680 | |
cfdf7647 | 681 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
682 | |
683 | msg.skb = skb; | |
684 | msg.offset = 0; | |
763ecff1 | 685 | msg.type = ICMPV6_ECHO_REPLY; |
1da177e4 | 686 | |
26879da5 WW |
687 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
688 | ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); | |
689 | ipc6.dontfrag = np->dontfrag; | |
690 | ipc6.opt = NULL; | |
691 | ||
1da177e4 | 692 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), |
26879da5 | 693 | sizeof(struct icmp6hdr), &ipc6, &fl6, |
a2d91a09 | 694 | (struct rt6_info *)dst, MSG_DONTWAIT, |
26879da5 | 695 | &sockc_unused); |
1da177e4 LT |
696 | |
697 | if (err) { | |
a16292a0 | 698 | __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 699 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
700 | } else { |
701 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
702 | skb->len + sizeof(struct icmp6hdr)); | |
1da177e4 | 703 | } |
1da177e4 | 704 | dst_release(dst); |
1ab1457c | 705 | out: |
405666db | 706 | icmpv6_xmit_unlock(sk); |
1da177e4 LT |
707 | } |
708 | ||
b94f1c09 | 709 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
1da177e4 | 710 | { |
41135cc8 | 711 | const struct inet6_protocol *ipprot; |
1da177e4 | 712 | int inner_offset; |
75f2811c | 713 | __be16 frag_off; |
f9242b6b | 714 | u8 nexthdr; |
7304fe46 | 715 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
716 | |
717 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
7304fe46 | 718 | goto out; |
1da177e4 LT |
719 | |
720 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; | |
721 | if (ipv6_ext_hdr(nexthdr)) { | |
722 | /* now skip over extension headers */ | |
75f2811c JG |
723 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
724 | &nexthdr, &frag_off); | |
67ba4152 | 725 | if (inner_offset < 0) |
7304fe46 | 726 | goto out; |
1da177e4 LT |
727 | } else { |
728 | inner_offset = sizeof(struct ipv6hdr); | |
729 | } | |
730 | ||
731 | /* Checkin header including 8 bytes of inner protocol header. */ | |
732 | if (!pskb_may_pull(skb, inner_offset+8)) | |
7304fe46 | 733 | goto out; |
1da177e4 | 734 | |
1da177e4 LT |
735 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
736 | Without this we will not able f.e. to make source routed | |
737 | pmtu discovery. | |
738 | Corresponding argument (opt) to notifiers is already added. | |
739 | --ANK (980726) | |
740 | */ | |
741 | ||
f9242b6b | 742 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
1da177e4 LT |
743 | if (ipprot && ipprot->err_handler) |
744 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); | |
1da177e4 | 745 | |
69d6da0b | 746 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
7304fe46 DJ |
747 | return; |
748 | ||
749 | out: | |
a16292a0 | 750 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
1da177e4 | 751 | } |
1ab1457c | 752 | |
1da177e4 LT |
753 | /* |
754 | * Handle icmp messages | |
755 | */ | |
756 | ||
e5bbef20 | 757 | static int icmpv6_rcv(struct sk_buff *skb) |
1da177e4 | 758 | { |
1da177e4 LT |
759 | struct net_device *dev = skb->dev; |
760 | struct inet6_dev *idev = __in6_dev_get(dev); | |
b71d1d42 | 761 | const struct in6_addr *saddr, *daddr; |
1da177e4 | 762 | struct icmp6hdr *hdr; |
d5fdd6ba | 763 | u8 type; |
e3e32170 | 764 | bool success = false; |
1da177e4 | 765 | |
aebcf82c | 766 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
def8b4fa | 767 | struct sec_path *sp = skb_sec_path(skb); |
8b7817f3 HX |
768 | int nh; |
769 | ||
def8b4fa | 770 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
aebcf82c HX |
771 | XFRM_STATE_ICMP)) |
772 | goto drop_no_count; | |
773 | ||
81aded24 | 774 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
8b7817f3 HX |
775 | goto drop_no_count; |
776 | ||
777 | nh = skb_network_offset(skb); | |
778 | skb_set_network_header(skb, sizeof(*hdr)); | |
779 | ||
780 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
781 | goto drop_no_count; | |
782 | ||
783 | skb_set_network_header(skb, nh); | |
784 | } | |
785 | ||
a16292a0 | 786 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
1da177e4 | 787 | |
0660e03f ACM |
788 | saddr = &ipv6_hdr(skb)->saddr; |
789 | daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 790 | |
39471ac8 | 791 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
ba7a46f1 JP |
792 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
793 | saddr, daddr); | |
39471ac8 | 794 | goto csum_error; |
1da177e4 LT |
795 | } |
796 | ||
8cf22943 HX |
797 | if (!pskb_pull(skb, sizeof(*hdr))) |
798 | goto discard_it; | |
1da177e4 | 799 | |
cc70ab26 | 800 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
801 | |
802 | type = hdr->icmp6_type; | |
803 | ||
f3832ed2 | 804 | ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); |
1da177e4 LT |
805 | |
806 | switch (type) { | |
807 | case ICMPV6_ECHO_REQUEST: | |
808 | icmpv6_echo_reply(skb); | |
809 | break; | |
810 | ||
811 | case ICMPV6_ECHO_REPLY: | |
e3e32170 | 812 | success = ping_rcv(skb); |
1da177e4 LT |
813 | break; |
814 | ||
815 | case ICMPV6_PKT_TOOBIG: | |
816 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update | |
817 | standard destination cache. Seems, only "advanced" | |
818 | destination cache will allow to solve this problem | |
819 | --ANK (980726) | |
820 | */ | |
821 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
822 | goto discard_it; | |
cc70ab26 | 823 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
824 | |
825 | /* | |
826 | * Drop through to notify | |
827 | */ | |
828 | ||
829 | case ICMPV6_DEST_UNREACH: | |
830 | case ICMPV6_TIME_EXCEED: | |
831 | case ICMPV6_PARAMPROB: | |
832 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
833 | break; | |
834 | ||
835 | case NDISC_ROUTER_SOLICITATION: | |
836 | case NDISC_ROUTER_ADVERTISEMENT: | |
837 | case NDISC_NEIGHBOUR_SOLICITATION: | |
838 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
839 | case NDISC_REDIRECT: | |
840 | ndisc_rcv(skb); | |
841 | break; | |
842 | ||
843 | case ICMPV6_MGM_QUERY: | |
844 | igmp6_event_query(skb); | |
845 | break; | |
846 | ||
847 | case ICMPV6_MGM_REPORT: | |
848 | igmp6_event_report(skb); | |
849 | break; | |
850 | ||
851 | case ICMPV6_MGM_REDUCTION: | |
852 | case ICMPV6_NI_QUERY: | |
853 | case ICMPV6_NI_REPLY: | |
854 | case ICMPV6_MLD2_REPORT: | |
855 | case ICMPV6_DHAAD_REQUEST: | |
856 | case ICMPV6_DHAAD_REPLY: | |
857 | case ICMPV6_MOBILE_PREFIX_SOL: | |
858 | case ICMPV6_MOBILE_PREFIX_ADV: | |
859 | break; | |
860 | ||
861 | default: | |
1da177e4 LT |
862 | /* informational */ |
863 | if (type & ICMPV6_INFOMSG_MASK) | |
864 | break; | |
865 | ||
4b3418fb BM |
866 | net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", |
867 | saddr, daddr); | |
ea85a0a2 | 868 | |
1ab1457c YH |
869 | /* |
870 | * error of unknown type. | |
871 | * must pass to upper level | |
1da177e4 LT |
872 | */ |
873 | ||
874 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
3ff50b79 SH |
875 | } |
876 | ||
e3e32170 RJ |
877 | /* until the v6 path can be better sorted assume failure and |
878 | * preserve the status quo behaviour for the rest of the paths to here | |
879 | */ | |
880 | if (success) | |
881 | consume_skb(skb); | |
882 | else | |
883 | kfree_skb(skb); | |
884 | ||
1da177e4 LT |
885 | return 0; |
886 | ||
6a5dc9e5 | 887 | csum_error: |
a16292a0 | 888 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); |
1da177e4 | 889 | discard_it: |
a16292a0 | 890 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
8b7817f3 | 891 | drop_no_count: |
1da177e4 LT |
892 | kfree_skb(skb); |
893 | return 0; | |
894 | } | |
895 | ||
4c9483b2 | 896 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
95e41e93 YH |
897 | u8 type, |
898 | const struct in6_addr *saddr, | |
899 | const struct in6_addr *daddr, | |
900 | int oif) | |
901 | { | |
4c9483b2 | 902 | memset(fl6, 0, sizeof(*fl6)); |
4e3fd7a0 AD |
903 | fl6->saddr = *saddr; |
904 | fl6->daddr = *daddr; | |
67ba4152 | 905 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1958b856 DM |
906 | fl6->fl6_icmp_type = type; |
907 | fl6->fl6_icmp_code = 0; | |
4c9483b2 DM |
908 | fl6->flowi6_oif = oif; |
909 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
95e41e93 YH |
910 | } |
911 | ||
98c6d1b2 | 912 | static int __net_init icmpv6_sk_init(struct net *net) |
1da177e4 LT |
913 | { |
914 | struct sock *sk; | |
915 | int err, i, j; | |
916 | ||
98c6d1b2 DL |
917 | net->ipv6.icmp_sk = |
918 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); | |
63159f29 | 919 | if (!net->ipv6.icmp_sk) |
79c91159 DL |
920 | return -ENOMEM; |
921 | ||
6f912042 | 922 | for_each_possible_cpu(i) { |
1ed8516f DL |
923 | err = inet_ctl_sock_create(&sk, PF_INET6, |
924 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 925 | if (err < 0) { |
f3213831 | 926 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
1da177e4 LT |
927 | err); |
928 | goto fail; | |
929 | } | |
930 | ||
1ed8516f | 931 | net->ipv6.icmp_sk[i] = sk; |
5c8cafd6 | 932 | |
1da177e4 LT |
933 | /* Enough space for 2 64K ICMP packets, including |
934 | * sk_buff struct overhead. | |
935 | */ | |
87fb4b7b | 936 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1da177e4 | 937 | } |
1da177e4 LT |
938 | return 0; |
939 | ||
940 | fail: | |
5c8cafd6 | 941 | for (j = 0; j < i; j++) |
1ed8516f | 942 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
98c6d1b2 | 943 | kfree(net->ipv6.icmp_sk); |
1da177e4 LT |
944 | return err; |
945 | } | |
946 | ||
98c6d1b2 | 947 | static void __net_exit icmpv6_sk_exit(struct net *net) |
1da177e4 LT |
948 | { |
949 | int i; | |
950 | ||
6f912042 | 951 | for_each_possible_cpu(i) { |
1ed8516f | 952 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
1da177e4 | 953 | } |
98c6d1b2 DL |
954 | kfree(net->ipv6.icmp_sk); |
955 | } | |
956 | ||
8ed7edce | 957 | static struct pernet_operations icmpv6_sk_ops = { |
67ba4152 IM |
958 | .init = icmpv6_sk_init, |
959 | .exit = icmpv6_sk_exit, | |
98c6d1b2 DL |
960 | }; |
961 | ||
962 | int __init icmpv6_init(void) | |
963 | { | |
964 | int err; | |
965 | ||
966 | err = register_pernet_subsys(&icmpv6_sk_ops); | |
967 | if (err < 0) | |
968 | return err; | |
969 | ||
970 | err = -EAGAIN; | |
971 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) | |
972 | goto fail; | |
5f5624cf PS |
973 | |
974 | err = inet6_register_icmp_sender(icmp6_send); | |
975 | if (err) | |
976 | goto sender_reg_err; | |
98c6d1b2 DL |
977 | return 0; |
978 | ||
5f5624cf PS |
979 | sender_reg_err: |
980 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); | |
98c6d1b2 | 981 | fail: |
f3213831 | 982 | pr_err("Failed to register ICMP6 protocol\n"); |
98c6d1b2 DL |
983 | unregister_pernet_subsys(&icmpv6_sk_ops); |
984 | return err; | |
985 | } | |
986 | ||
8ed7edce | 987 | void icmpv6_cleanup(void) |
98c6d1b2 | 988 | { |
5f5624cf | 989 | inet6_unregister_icmp_sender(icmp6_send); |
98c6d1b2 | 990 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1da177e4 LT |
991 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
992 | } | |
993 | ||
98c6d1b2 | 994 | |
9b5b5cff | 995 | static const struct icmp6_err { |
1da177e4 LT |
996 | int err; |
997 | int fatal; | |
998 | } tab_unreach[] = { | |
999 | { /* NOROUTE */ | |
1000 | .err = ENETUNREACH, | |
1001 | .fatal = 0, | |
1002 | }, | |
1003 | { /* ADM_PROHIBITED */ | |
1004 | .err = EACCES, | |
1005 | .fatal = 1, | |
1006 | }, | |
1007 | { /* Was NOT_NEIGHBOUR, now reserved */ | |
1008 | .err = EHOSTUNREACH, | |
1009 | .fatal = 0, | |
1010 | }, | |
1011 | { /* ADDR_UNREACH */ | |
1012 | .err = EHOSTUNREACH, | |
1013 | .fatal = 0, | |
1014 | }, | |
1015 | { /* PORT_UNREACH */ | |
1016 | .err = ECONNREFUSED, | |
1017 | .fatal = 1, | |
1018 | }, | |
61e76b17 JB |
1019 | { /* POLICY_FAIL */ |
1020 | .err = EACCES, | |
1021 | .fatal = 1, | |
1022 | }, | |
1023 | { /* REJECT_ROUTE */ | |
1024 | .err = EACCES, | |
1025 | .fatal = 1, | |
1026 | }, | |
1da177e4 LT |
1027 | }; |
1028 | ||
d5fdd6ba | 1029 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1da177e4 LT |
1030 | { |
1031 | int fatal = 0; | |
1032 | ||
1033 | *err = EPROTO; | |
1034 | ||
1035 | switch (type) { | |
1036 | case ICMPV6_DEST_UNREACH: | |
1037 | fatal = 1; | |
61e76b17 | 1038 | if (code < ARRAY_SIZE(tab_unreach)) { |
1da177e4 LT |
1039 | *err = tab_unreach[code].err; |
1040 | fatal = tab_unreach[code].fatal; | |
1041 | } | |
1042 | break; | |
1043 | ||
1044 | case ICMPV6_PKT_TOOBIG: | |
1045 | *err = EMSGSIZE; | |
1046 | break; | |
1ab1457c | 1047 | |
1da177e4 LT |
1048 | case ICMPV6_PARAMPROB: |
1049 | *err = EPROTO; | |
1050 | fatal = 1; | |
1051 | break; | |
1052 | ||
1053 | case ICMPV6_TIME_EXCEED: | |
1054 | *err = EHOSTUNREACH; | |
1055 | break; | |
3ff50b79 | 1056 | } |
1da177e4 LT |
1057 | |
1058 | return fatal; | |
1059 | } | |
7159039a YH |
1060 | EXPORT_SYMBOL(icmpv6_err_convert); |
1061 | ||
1da177e4 | 1062 | #ifdef CONFIG_SYSCTL |
e8243534 | 1063 | static struct ctl_table ipv6_icmp_table_template[] = { |
1da177e4 | 1064 | { |
1da177e4 | 1065 | .procname = "ratelimit", |
41a76906 | 1066 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1da177e4 LT |
1067 | .maxlen = sizeof(int), |
1068 | .mode = 0644, | |
6d9f239a | 1069 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 1070 | }, |
f8572d8f | 1071 | { }, |
1da177e4 | 1072 | }; |
760f2d01 | 1073 | |
2c8c1e72 | 1074 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
760f2d01 DL |
1075 | { |
1076 | struct ctl_table *table; | |
1077 | ||
1078 | table = kmemdup(ipv6_icmp_table_template, | |
1079 | sizeof(ipv6_icmp_table_template), | |
1080 | GFP_KERNEL); | |
5ee09105 | 1081 | |
c027aab4 | 1082 | if (table) |
5ee09105 YH |
1083 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
1084 | ||
760f2d01 DL |
1085 | return table; |
1086 | } | |
1da177e4 | 1087 | #endif |