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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Internet Control Message Protocol (ICMPv6) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * | |
1da177e4 LT |
8 | * Based on net/ipv4/icmp.c |
9 | * | |
10 | * RFC 1885 | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
21 | * Andi Kleen : exception handling | |
22 | * Andi Kleen add rate limits. never reply to a icmp. | |
23 | * add more length checks and other fixes. | |
24 | * yoshfuji : ensure to sent parameter problem for | |
25 | * fragments. | |
26 | * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. | |
27 | * Randy Dunlap and | |
28 | * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support | |
29 | * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data | |
30 | */ | |
31 | ||
f3213831 JP |
32 | #define pr_fmt(fmt) "IPv6: " fmt |
33 | ||
1da177e4 LT |
34 | #include <linux/module.h> |
35 | #include <linux/errno.h> | |
36 | #include <linux/types.h> | |
37 | #include <linux/socket.h> | |
38 | #include <linux/in.h> | |
39 | #include <linux/kernel.h> | |
1da177e4 LT |
40 | #include <linux/sockios.h> |
41 | #include <linux/net.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <linux/init.h> | |
763ecff1 | 44 | #include <linux/netfilter.h> |
5a0e3ad6 | 45 | #include <linux/slab.h> |
1da177e4 LT |
46 | |
47 | #ifdef CONFIG_SYSCTL | |
48 | #include <linux/sysctl.h> | |
49 | #endif | |
50 | ||
51 | #include <linux/inet.h> | |
52 | #include <linux/netdevice.h> | |
53 | #include <linux/icmpv6.h> | |
54 | ||
55 | #include <net/ip.h> | |
56 | #include <net/sock.h> | |
57 | ||
58 | #include <net/ipv6.h> | |
59 | #include <net/ip6_checksum.h> | |
6d0bfe22 | 60 | #include <net/ping.h> |
1da177e4 LT |
61 | #include <net/protocol.h> |
62 | #include <net/raw.h> | |
63 | #include <net/rawv6.h> | |
64 | #include <net/transp_v6.h> | |
65 | #include <net/ip6_route.h> | |
66 | #include <net/addrconf.h> | |
67 | #include <net/icmp.h> | |
8b7817f3 | 68 | #include <net/xfrm.h> |
1ed8516f | 69 | #include <net/inet_common.h> |
825edac4 | 70 | #include <net/dsfield.h> |
ca254490 | 71 | #include <net/l3mdev.h> |
1da177e4 | 72 | |
7c0f6ba6 | 73 | #include <linux/uaccess.h> |
1da177e4 | 74 | |
1da177e4 LT |
75 | /* |
76 | * The ICMP socket(s). This is the most convenient way to flow control | |
77 | * our ICMP output as well as maintain a clean interface throughout | |
78 | * all layers. All Socketless IP sends will soon be gone. | |
79 | * | |
80 | * On SMP we have one ICMP socket per-cpu. | |
81 | */ | |
98c6d1b2 DL |
82 | static inline struct sock *icmpv6_sk(struct net *net) |
83 | { | |
84 | return net->ipv6.icmp_sk[smp_processor_id()]; | |
85 | } | |
1da177e4 | 86 | |
6f809da2 SK |
87 | static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
88 | u8 type, u8 code, int offset, __be32 info) | |
89 | { | |
6d0bfe22 LC |
90 | /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ |
91 | struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); | |
6f809da2 SK |
92 | struct net *net = dev_net(skb->dev); |
93 | ||
94 | if (type == ICMPV6_PKT_TOOBIG) | |
e2d118a1 | 95 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
6f809da2 | 96 | else if (type == NDISC_REDIRECT) |
e2d118a1 LC |
97 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
98 | sock_net_uid(net, NULL)); | |
6d0bfe22 LC |
99 | |
100 | if (!(type & ICMPV6_INFOMSG_MASK)) | |
101 | if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) | |
dcb94b88 | 102 | ping_err(skb, offset, ntohl(info)); |
6f809da2 SK |
103 | } |
104 | ||
e5bbef20 | 105 | static int icmpv6_rcv(struct sk_buff *skb); |
1da177e4 | 106 | |
41135cc8 | 107 | static const struct inet6_protocol icmpv6_protocol = { |
1da177e4 | 108 | .handler = icmpv6_rcv, |
6f809da2 | 109 | .err_handler = icmpv6_err, |
8b7817f3 | 110 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1da177e4 LT |
111 | }; |
112 | ||
fdc0bde9 | 113 | static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) |
1da177e4 | 114 | { |
fdc0bde9 DL |
115 | struct sock *sk; |
116 | ||
1da177e4 LT |
117 | local_bh_disable(); |
118 | ||
fdc0bde9 | 119 | sk = icmpv6_sk(net); |
405666db | 120 | if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { |
1da177e4 LT |
121 | /* This can happen if the output path (f.e. SIT or |
122 | * ip6ip6 tunnel) signals dst_link_failure() for an | |
123 | * outgoing ICMP6 packet. | |
124 | */ | |
125 | local_bh_enable(); | |
fdc0bde9 | 126 | return NULL; |
1da177e4 | 127 | } |
fdc0bde9 | 128 | return sk; |
1da177e4 LT |
129 | } |
130 | ||
405666db | 131 | static __inline__ void icmpv6_xmit_unlock(struct sock *sk) |
1da177e4 | 132 | { |
405666db | 133 | spin_unlock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
134 | } |
135 | ||
1da177e4 LT |
136 | /* |
137 | * Figure out, may we reply to this packet with icmp error. | |
138 | * | |
139 | * We do not reply, if: | |
140 | * - it was icmp error message. | |
141 | * - it is truncated, so that it is known, that protocol is ICMPV6 | |
142 | * (i.e. in the middle of some exthdr) | |
143 | * | |
144 | * --ANK (980726) | |
145 | */ | |
146 | ||
a50feda5 | 147 | static bool is_ineligible(const struct sk_buff *skb) |
1da177e4 | 148 | { |
0660e03f | 149 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
1da177e4 | 150 | int len = skb->len - ptr; |
0660e03f | 151 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
75f2811c | 152 | __be16 frag_off; |
1da177e4 LT |
153 | |
154 | if (len < 0) | |
a50feda5 | 155 | return true; |
1da177e4 | 156 | |
75f2811c | 157 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); |
1da177e4 | 158 | if (ptr < 0) |
a50feda5 | 159 | return false; |
1da177e4 LT |
160 | if (nexthdr == IPPROTO_ICMPV6) { |
161 | u8 _type, *tp; | |
162 | tp = skb_header_pointer(skb, | |
163 | ptr+offsetof(struct icmp6hdr, icmp6_type), | |
164 | sizeof(_type), &_type); | |
63159f29 | 165 | if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) |
a50feda5 | 166 | return true; |
1da177e4 | 167 | } |
a50feda5 | 168 | return false; |
1da177e4 LT |
169 | } |
170 | ||
1ab1457c YH |
171 | /* |
172 | * Check the ICMP output rate limit | |
1da177e4 | 173 | */ |
4cdf507d ED |
174 | static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, |
175 | struct flowi6 *fl6) | |
1da177e4 | 176 | { |
3b1e0a65 | 177 | struct net *net = sock_net(sk); |
4cdf507d | 178 | struct dst_entry *dst; |
92d86829 | 179 | bool res = false; |
1da177e4 LT |
180 | |
181 | /* Informational messages are not limited. */ | |
182 | if (type & ICMPV6_INFOMSG_MASK) | |
92d86829 | 183 | return true; |
1da177e4 LT |
184 | |
185 | /* Do not limit pmtu discovery, it would break it. */ | |
186 | if (type == ICMPV6_PKT_TOOBIG) | |
92d86829 | 187 | return true; |
1da177e4 | 188 | |
1ab1457c | 189 | /* |
1da177e4 LT |
190 | * Look up the output route. |
191 | * XXX: perhaps the expire for routing entries cloned by | |
192 | * this lookup should be more aggressive (not longer than timeout). | |
193 | */ | |
4c9483b2 | 194 | dst = ip6_route_output(net, sk, fl6); |
1da177e4 | 195 | if (dst->error) { |
3bd653c8 | 196 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
a11d206d | 197 | IPSTATS_MIB_OUTNOROUTES); |
1da177e4 | 198 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
92d86829 | 199 | res = true; |
1da177e4 LT |
200 | } else { |
201 | struct rt6_info *rt = (struct rt6_info *)dst; | |
9a43b709 | 202 | int tmo = net->ipv6.sysctl.icmpv6_time; |
1da177e4 LT |
203 | |
204 | /* Give more bandwidth to wider prefixes. */ | |
205 | if (rt->rt6i_dst.plen < 128) | |
206 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); | |
207 | ||
4cdf507d ED |
208 | if (icmp_global_allow()) { |
209 | struct inet_peer *peer; | |
210 | ||
211 | peer = inet_getpeer_v6(net->ipv6.peers, | |
fd0273d7 | 212 | &fl6->daddr, 1); |
4cdf507d ED |
213 | res = inet_peer_xrlim_allow(peer, tmo); |
214 | if (peer) | |
215 | inet_putpeer(peer); | |
216 | } | |
1da177e4 LT |
217 | } |
218 | dst_release(dst); | |
219 | return res; | |
220 | } | |
221 | ||
222 | /* | |
223 | * an inline helper for the "simple" if statement below | |
224 | * checks if parameter problem report is caused by an | |
1ab1457c | 225 | * unrecognized IPv6 option that has the Option Type |
1da177e4 LT |
226 | * highest-order two bits set to 10 |
227 | */ | |
228 | ||
a50feda5 | 229 | static bool opt_unrec(struct sk_buff *skb, __u32 offset) |
1da177e4 LT |
230 | { |
231 | u8 _optval, *op; | |
232 | ||
bbe735e4 | 233 | offset += skb_network_offset(skb); |
1da177e4 | 234 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
63159f29 | 235 | if (!op) |
a50feda5 | 236 | return true; |
1da177e4 LT |
237 | return (*op & 0xC0) == 0x80; |
238 | } | |
239 | ||
6d0bfe22 LC |
240 | int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
241 | struct icmp6hdr *thdr, int len) | |
1da177e4 LT |
242 | { |
243 | struct sk_buff *skb; | |
244 | struct icmp6hdr *icmp6h; | |
245 | int err = 0; | |
246 | ||
e5d08d71 | 247 | skb = skb_peek(&sk->sk_write_queue); |
63159f29 | 248 | if (!skb) |
1da177e4 LT |
249 | goto out; |
250 | ||
cc70ab26 | 251 | icmp6h = icmp6_hdr(skb); |
1da177e4 LT |
252 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
253 | icmp6h->icmp6_cksum = 0; | |
254 | ||
255 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
07f0757a | 256 | skb->csum = csum_partial(icmp6h, |
1da177e4 | 257 | sizeof(struct icmp6hdr), skb->csum); |
4c9483b2 DM |
258 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
259 | &fl6->daddr, | |
260 | len, fl6->flowi6_proto, | |
1da177e4 LT |
261 | skb->csum); |
262 | } else { | |
868c86bc | 263 | __wsum tmp_csum = 0; |
1da177e4 LT |
264 | |
265 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
266 | tmp_csum = csum_add(tmp_csum, skb->csum); | |
267 | } | |
268 | ||
07f0757a | 269 | tmp_csum = csum_partial(icmp6h, |
1da177e4 | 270 | sizeof(struct icmp6hdr), tmp_csum); |
4c9483b2 DM |
271 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
272 | &fl6->daddr, | |
273 | len, fl6->flowi6_proto, | |
868c86bc | 274 | tmp_csum); |
1da177e4 | 275 | } |
1da177e4 LT |
276 | ip6_push_pending_frames(sk); |
277 | out: | |
278 | return err; | |
279 | } | |
280 | ||
281 | struct icmpv6_msg { | |
282 | struct sk_buff *skb; | |
283 | int offset; | |
763ecff1 | 284 | uint8_t type; |
1da177e4 LT |
285 | }; |
286 | ||
287 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) | |
288 | { | |
289 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; | |
290 | struct sk_buff *org_skb = msg->skb; | |
5f92a738 | 291 | __wsum csum = 0; |
1da177e4 LT |
292 | |
293 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, | |
294 | to, len, csum); | |
295 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
763ecff1 YK |
296 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
297 | nf_ct_attach(skb, org_skb); | |
1da177e4 LT |
298 | return 0; |
299 | } | |
300 | ||
07a93626 | 301 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
79383236 MN |
302 | static void mip6_addr_swap(struct sk_buff *skb) |
303 | { | |
0660e03f | 304 | struct ipv6hdr *iph = ipv6_hdr(skb); |
79383236 MN |
305 | struct inet6_skb_parm *opt = IP6CB(skb); |
306 | struct ipv6_destopt_hao *hao; | |
307 | struct in6_addr tmp; | |
308 | int off; | |
309 | ||
310 | if (opt->dsthao) { | |
311 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); | |
312 | if (likely(off >= 0)) { | |
d56f90a7 ACM |
313 | hao = (struct ipv6_destopt_hao *) |
314 | (skb_network_header(skb) + off); | |
4e3fd7a0 AD |
315 | tmp = iph->saddr; |
316 | iph->saddr = hao->addr; | |
317 | hao->addr = tmp; | |
79383236 MN |
318 | } |
319 | } | |
320 | } | |
321 | #else | |
322 | static inline void mip6_addr_swap(struct sk_buff *skb) {} | |
323 | #endif | |
324 | ||
e8243534 | 325 | static struct dst_entry *icmpv6_route_lookup(struct net *net, |
326 | struct sk_buff *skb, | |
327 | struct sock *sk, | |
328 | struct flowi6 *fl6) | |
b42835db DM |
329 | { |
330 | struct dst_entry *dst, *dst2; | |
4c9483b2 | 331 | struct flowi6 fl2; |
b42835db DM |
332 | int err; |
333 | ||
343d60aa | 334 | err = ip6_dst_lookup(net, sk, &dst, fl6); |
b42835db DM |
335 | if (err) |
336 | return ERR_PTR(err); | |
337 | ||
338 | /* | |
339 | * We won't send icmp if the destination is known | |
340 | * anycast. | |
341 | */ | |
2647a9b0 | 342 | if (ipv6_anycast_destination(dst, &fl6->daddr)) { |
ba7a46f1 | 343 | net_dbg_ratelimited("icmp6_send: acast source\n"); |
b42835db DM |
344 | dst_release(dst); |
345 | return ERR_PTR(-EINVAL); | |
346 | } | |
347 | ||
348 | /* No need to clone since we're just using its address. */ | |
349 | dst2 = dst; | |
350 | ||
4c9483b2 | 351 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); |
452edd59 | 352 | if (!IS_ERR(dst)) { |
b42835db DM |
353 | if (dst != dst2) |
354 | return dst; | |
452edd59 DM |
355 | } else { |
356 | if (PTR_ERR(dst) == -EPERM) | |
357 | dst = NULL; | |
358 | else | |
359 | return dst; | |
b42835db DM |
360 | } |
361 | ||
4c9483b2 | 362 | err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); |
b42835db DM |
363 | if (err) |
364 | goto relookup_failed; | |
365 | ||
343d60aa | 366 | err = ip6_dst_lookup(net, sk, &dst2, &fl2); |
b42835db DM |
367 | if (err) |
368 | goto relookup_failed; | |
369 | ||
4c9483b2 | 370 | dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); |
452edd59 | 371 | if (!IS_ERR(dst2)) { |
b42835db DM |
372 | dst_release(dst); |
373 | dst = dst2; | |
452edd59 DM |
374 | } else { |
375 | err = PTR_ERR(dst2); | |
376 | if (err == -EPERM) { | |
377 | dst_release(dst); | |
378 | return dst2; | |
379 | } else | |
380 | goto relookup_failed; | |
b42835db DM |
381 | } |
382 | ||
383 | relookup_failed: | |
384 | if (dst) | |
385 | return dst; | |
386 | return ERR_PTR(err); | |
387 | } | |
388 | ||
1da177e4 LT |
389 | /* |
390 | * Send an ICMP message in response to a packet in error | |
391 | */ | |
b1cadc1a ED |
392 | static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, |
393 | const struct in6_addr *force_saddr) | |
1da177e4 | 394 | { |
c346dca1 | 395 | struct net *net = dev_net(skb->dev); |
1da177e4 | 396 | struct inet6_dev *idev = NULL; |
0660e03f | 397 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
84427d53 YH |
398 | struct sock *sk; |
399 | struct ipv6_pinfo *np; | |
b71d1d42 | 400 | const struct in6_addr *saddr = NULL; |
1da177e4 LT |
401 | struct dst_entry *dst; |
402 | struct icmp6hdr tmp_hdr; | |
4c9483b2 | 403 | struct flowi6 fl6; |
1da177e4 | 404 | struct icmpv6_msg msg; |
c14ac945 | 405 | struct sockcm_cookie sockc_unused = {0}; |
26879da5 | 406 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
407 | int iif = 0; |
408 | int addr_type = 0; | |
409 | int len; | |
1da177e4 | 410 | int err = 0; |
e110861f | 411 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
1da177e4 | 412 | |
27a884dc | 413 | if ((u8 *)hdr < skb->head || |
29a3cad5 | 414 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
1da177e4 LT |
415 | return; |
416 | ||
417 | /* | |
1ab1457c | 418 | * Make sure we respect the rules |
1da177e4 | 419 | * i.e. RFC 1885 2.4(e) |
5f5624cf | 420 | * Rule (e.1) is enforced by not using icmp6_send |
1da177e4 LT |
421 | * in any code that processes icmp errors. |
422 | */ | |
423 | addr_type = ipv6_addr_type(&hdr->daddr); | |
424 | ||
446fab59 | 425 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || |
d94c1f92 | 426 | ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) |
1da177e4 LT |
427 | saddr = &hdr->daddr; |
428 | ||
429 | /* | |
430 | * Dest addr check | |
431 | */ | |
432 | ||
9a6b4b39 | 433 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
1da177e4 | 434 | if (type != ICMPV6_PKT_TOOBIG && |
1ab1457c YH |
435 | !(type == ICMPV6_PARAMPROB && |
436 | code == ICMPV6_UNK_OPTION && | |
1da177e4 LT |
437 | (opt_unrec(skb, info)))) |
438 | return; | |
439 | ||
440 | saddr = NULL; | |
441 | } | |
442 | ||
443 | addr_type = ipv6_addr_type(&hdr->saddr); | |
444 | ||
445 | /* | |
446 | * Source addr check | |
447 | */ | |
448 | ||
842df073 | 449 | if (__ipv6_addr_needs_scope_id(addr_type)) |
1da177e4 | 450 | iif = skb->dev->ifindex; |
79dc7e3f DA |
451 | else { |
452 | dst = skb_dst(skb); | |
453 | iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); | |
454 | } | |
1da177e4 LT |
455 | |
456 | /* | |
8de3351e YH |
457 | * Must not send error if the source does not uniquely |
458 | * identify a single node (RFC2463 Section 2.4). | |
459 | * We check unspecified / multicast addresses here, | |
460 | * and anycast addresses will be checked later. | |
1da177e4 LT |
461 | */ |
462 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { | |
4b3418fb BM |
463 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", |
464 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
465 | return; |
466 | } | |
467 | ||
1ab1457c | 468 | /* |
1da177e4 LT |
469 | * Never answer to a ICMP packet. |
470 | */ | |
471 | if (is_ineligible(skb)) { | |
4b3418fb BM |
472 | net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", |
473 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
474 | return; |
475 | } | |
476 | ||
79383236 MN |
477 | mip6_addr_swap(skb); |
478 | ||
4c9483b2 DM |
479 | memset(&fl6, 0, sizeof(fl6)); |
480 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 481 | fl6.daddr = hdr->saddr; |
b1cadc1a ED |
482 | if (force_saddr) |
483 | saddr = force_saddr; | |
1da177e4 | 484 | if (saddr) |
4e3fd7a0 | 485 | fl6.saddr = *saddr; |
e110861f | 486 | fl6.flowi6_mark = mark; |
4c9483b2 | 487 | fl6.flowi6_oif = iif; |
1958b856 DM |
488 | fl6.fl6_icmp_type = type; |
489 | fl6.fl6_icmp_code = code; | |
e2d118a1 | 490 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
4c9483b2 | 491 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 492 | |
fdc0bde9 | 493 | sk = icmpv6_xmit_lock(net); |
63159f29 | 494 | if (!sk) |
405666db | 495 | return; |
e110861f | 496 | sk->sk_mark = mark; |
fdc0bde9 | 497 | np = inet6_sk(sk); |
405666db | 498 | |
4c9483b2 | 499 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
1da177e4 LT |
500 | goto out; |
501 | ||
502 | tmp_hdr.icmp6_type = type; | |
503 | tmp_hdr.icmp6_code = code; | |
504 | tmp_hdr.icmp6_cksum = 0; | |
505 | tmp_hdr.icmp6_pointer = htonl(info); | |
506 | ||
4c9483b2 DM |
507 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
508 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
509 | else if (!fl6.flowi6_oif) |
510 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 511 | |
38b7097b HFS |
512 | ipc6.tclass = np->tclass; |
513 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); | |
514 | ||
4c9483b2 | 515 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
b42835db | 516 | if (IS_ERR(dst)) |
1da177e4 | 517 | goto out; |
8de3351e | 518 | |
26879da5 | 519 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
26879da5 WW |
520 | ipc6.dontfrag = np->dontfrag; |
521 | ipc6.opt = NULL; | |
1da177e4 LT |
522 | |
523 | msg.skb = skb; | |
bbe735e4 | 524 | msg.offset = skb_network_offset(skb); |
763ecff1 | 525 | msg.type = type; |
1da177e4 LT |
526 | |
527 | len = skb->len - msg.offset; | |
67ba4152 | 528 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
1da177e4 | 529 | if (len < 0) { |
4b3418fb BM |
530 | net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", |
531 | &hdr->saddr, &hdr->daddr); | |
1da177e4 LT |
532 | goto out_dst_release; |
533 | } | |
534 | ||
cfdf7647 ED |
535 | rcu_read_lock(); |
536 | idev = __in6_dev_get(skb->dev); | |
1da177e4 LT |
537 | |
538 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, | |
539 | len + sizeof(struct icmp6hdr), | |
26879da5 WW |
540 | sizeof(struct icmp6hdr), |
541 | &ipc6, &fl6, (struct rt6_info *)dst, | |
542 | MSG_DONTWAIT, &sockc_unused); | |
1da177e4 | 543 | if (err) { |
43a43b60 | 544 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 545 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
546 | } else { |
547 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
548 | len + sizeof(struct icmp6hdr)); | |
1da177e4 | 549 | } |
cfdf7647 | 550 | rcu_read_unlock(); |
1da177e4 LT |
551 | out_dst_release: |
552 | dst_release(dst); | |
553 | out: | |
405666db | 554 | icmpv6_xmit_unlock(sk); |
1da177e4 | 555 | } |
5f5624cf PS |
556 | |
557 | /* Slightly more convenient version of icmp6_send. | |
558 | */ | |
559 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) | |
560 | { | |
b1cadc1a | 561 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); |
5f5624cf PS |
562 | kfree_skb(skb); |
563 | } | |
7159039a | 564 | |
5fbba8ac ED |
565 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH |
566 | * if sufficient data bytes are available | |
567 | * @nhs is the size of the tunnel header(s) : | |
568 | * Either an IPv4 header for SIT encap | |
569 | * an IPv4 header + GRE header for GRE encap | |
570 | */ | |
20e1954f ED |
571 | int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, |
572 | unsigned int data_len) | |
5fbba8ac | 573 | { |
2d7a3b27 | 574 | struct in6_addr temp_saddr; |
5fbba8ac ED |
575 | struct rt6_info *rt; |
576 | struct sk_buff *skb2; | |
20e1954f | 577 | u32 info = 0; |
5fbba8ac ED |
578 | |
579 | if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) | |
580 | return 1; | |
581 | ||
20e1954f ED |
582 | /* RFC 4884 (partial) support for ICMP extensions */ |
583 | if (data_len < 128 || (data_len & 7) || skb->len < data_len) | |
584 | data_len = 0; | |
585 | ||
586 | skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); | |
5fbba8ac ED |
587 | |
588 | if (!skb2) | |
589 | return 1; | |
590 | ||
591 | skb_dst_drop(skb2); | |
592 | skb_pull(skb2, nhs); | |
593 | skb_reset_network_header(skb2); | |
594 | ||
595 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); | |
596 | ||
597 | if (rt && rt->dst.dev) | |
598 | skb2->dev = rt->dst.dev; | |
599 | ||
2d7a3b27 | 600 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); |
20e1954f ED |
601 | |
602 | if (data_len) { | |
603 | /* RFC 4884 (partial) support : | |
604 | * insert 0 padding at the end, before the extensions | |
605 | */ | |
606 | __skb_push(skb2, nhs); | |
607 | skb_reset_network_header(skb2); | |
608 | memmove(skb2->data, skb2->data + nhs, data_len - nhs); | |
609 | memset(skb2->data + data_len - nhs, 0, nhs); | |
610 | /* RFC 4884 4.5 : Length is measured in 64-bit words, | |
611 | * and stored in reserved[0] | |
612 | */ | |
613 | info = (data_len/8) << 24; | |
614 | } | |
2d7a3b27 ED |
615 | if (type == ICMP_TIME_EXCEEDED) |
616 | icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
20e1954f | 617 | info, &temp_saddr); |
2d7a3b27 ED |
618 | else |
619 | icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, | |
20e1954f | 620 | info, &temp_saddr); |
5fbba8ac ED |
621 | if (rt) |
622 | ip6_rt_put(rt); | |
623 | ||
624 | kfree_skb(skb2); | |
625 | ||
626 | return 0; | |
627 | } | |
628 | EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); | |
629 | ||
1da177e4 LT |
630 | static void icmpv6_echo_reply(struct sk_buff *skb) |
631 | { | |
c346dca1 | 632 | struct net *net = dev_net(skb->dev); |
84427d53 | 633 | struct sock *sk; |
1da177e4 | 634 | struct inet6_dev *idev; |
84427d53 | 635 | struct ipv6_pinfo *np; |
b71d1d42 | 636 | const struct in6_addr *saddr = NULL; |
cc70ab26 | 637 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 | 638 | struct icmp6hdr tmp_hdr; |
4c9483b2 | 639 | struct flowi6 fl6; |
1da177e4 LT |
640 | struct icmpv6_msg msg; |
641 | struct dst_entry *dst; | |
26879da5 | 642 | struct ipcm6_cookie ipc6; |
1da177e4 | 643 | int err = 0; |
e110861f | 644 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
c14ac945 | 645 | struct sockcm_cookie sockc_unused = {0}; |
1da177e4 | 646 | |
0660e03f | 647 | saddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 648 | |
509aba3b | 649 | if (!ipv6_unicast_destination(skb) && |
ec35b61e | 650 | !(net->ipv6.sysctl.anycast_src_echo_reply && |
2647a9b0 | 651 | ipv6_anycast_destination(skb_dst(skb), saddr))) |
1da177e4 LT |
652 | saddr = NULL; |
653 | ||
654 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); | |
655 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; | |
656 | ||
4c9483b2 DM |
657 | memset(&fl6, 0, sizeof(fl6)); |
658 | fl6.flowi6_proto = IPPROTO_ICMPV6; | |
4e3fd7a0 | 659 | fl6.daddr = ipv6_hdr(skb)->saddr; |
1da177e4 | 660 | if (saddr) |
4e3fd7a0 | 661 | fl6.saddr = *saddr; |
9ff74384 | 662 | fl6.flowi6_oif = skb->dev->ifindex; |
1958b856 | 663 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
e110861f | 664 | fl6.flowi6_mark = mark; |
e2d118a1 | 665 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
4c9483b2 | 666 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 667 | |
fdc0bde9 | 668 | sk = icmpv6_xmit_lock(net); |
63159f29 | 669 | if (!sk) |
405666db | 670 | return; |
e110861f | 671 | sk->sk_mark = mark; |
fdc0bde9 | 672 | np = inet6_sk(sk); |
405666db | 673 | |
4c9483b2 DM |
674 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
675 | fl6.flowi6_oif = np->mcast_oif; | |
c4062dfc EH |
676 | else if (!fl6.flowi6_oif) |
677 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 678 | |
343d60aa | 679 | err = ip6_dst_lookup(net, sk, &dst, &fl6); |
1da177e4 LT |
680 | if (err) |
681 | goto out; | |
4c9483b2 | 682 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
452edd59 | 683 | if (IS_ERR(dst)) |
e104411b | 684 | goto out; |
1da177e4 | 685 | |
cfdf7647 | 686 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
687 | |
688 | msg.skb = skb; | |
689 | msg.offset = 0; | |
763ecff1 | 690 | msg.type = ICMPV6_ECHO_REPLY; |
1da177e4 | 691 | |
26879da5 WW |
692 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
693 | ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); | |
694 | ipc6.dontfrag = np->dontfrag; | |
695 | ipc6.opt = NULL; | |
696 | ||
1da177e4 | 697 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), |
26879da5 | 698 | sizeof(struct icmp6hdr), &ipc6, &fl6, |
a2d91a09 | 699 | (struct rt6_info *)dst, MSG_DONTWAIT, |
26879da5 | 700 | &sockc_unused); |
1da177e4 LT |
701 | |
702 | if (err) { | |
a16292a0 | 703 | __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
1da177e4 | 704 | ip6_flush_pending_frames(sk); |
cfdf7647 ED |
705 | } else { |
706 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, | |
707 | skb->len + sizeof(struct icmp6hdr)); | |
1da177e4 | 708 | } |
1da177e4 | 709 | dst_release(dst); |
1ab1457c | 710 | out: |
405666db | 711 | icmpv6_xmit_unlock(sk); |
1da177e4 LT |
712 | } |
713 | ||
b94f1c09 | 714 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
1da177e4 | 715 | { |
41135cc8 | 716 | const struct inet6_protocol *ipprot; |
1da177e4 | 717 | int inner_offset; |
75f2811c | 718 | __be16 frag_off; |
f9242b6b | 719 | u8 nexthdr; |
7304fe46 | 720 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
721 | |
722 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
7304fe46 | 723 | goto out; |
1da177e4 LT |
724 | |
725 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; | |
726 | if (ipv6_ext_hdr(nexthdr)) { | |
727 | /* now skip over extension headers */ | |
75f2811c JG |
728 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
729 | &nexthdr, &frag_off); | |
67ba4152 | 730 | if (inner_offset < 0) |
7304fe46 | 731 | goto out; |
1da177e4 LT |
732 | } else { |
733 | inner_offset = sizeof(struct ipv6hdr); | |
734 | } | |
735 | ||
736 | /* Checkin header including 8 bytes of inner protocol header. */ | |
737 | if (!pskb_may_pull(skb, inner_offset+8)) | |
7304fe46 | 738 | goto out; |
1da177e4 | 739 | |
1da177e4 LT |
740 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
741 | Without this we will not able f.e. to make source routed | |
742 | pmtu discovery. | |
743 | Corresponding argument (opt) to notifiers is already added. | |
744 | --ANK (980726) | |
745 | */ | |
746 | ||
f9242b6b | 747 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
1da177e4 LT |
748 | if (ipprot && ipprot->err_handler) |
749 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); | |
1da177e4 | 750 | |
69d6da0b | 751 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
7304fe46 DJ |
752 | return; |
753 | ||
754 | out: | |
a16292a0 | 755 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
1da177e4 | 756 | } |
1ab1457c | 757 | |
1da177e4 LT |
758 | /* |
759 | * Handle icmp messages | |
760 | */ | |
761 | ||
e5bbef20 | 762 | static int icmpv6_rcv(struct sk_buff *skb) |
1da177e4 | 763 | { |
1da177e4 LT |
764 | struct net_device *dev = skb->dev; |
765 | struct inet6_dev *idev = __in6_dev_get(dev); | |
b71d1d42 | 766 | const struct in6_addr *saddr, *daddr; |
1da177e4 | 767 | struct icmp6hdr *hdr; |
d5fdd6ba | 768 | u8 type; |
e3e32170 | 769 | bool success = false; |
1da177e4 | 770 | |
aebcf82c | 771 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
def8b4fa | 772 | struct sec_path *sp = skb_sec_path(skb); |
8b7817f3 HX |
773 | int nh; |
774 | ||
def8b4fa | 775 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
aebcf82c HX |
776 | XFRM_STATE_ICMP)) |
777 | goto drop_no_count; | |
778 | ||
81aded24 | 779 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
8b7817f3 HX |
780 | goto drop_no_count; |
781 | ||
782 | nh = skb_network_offset(skb); | |
783 | skb_set_network_header(skb, sizeof(*hdr)); | |
784 | ||
785 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
786 | goto drop_no_count; | |
787 | ||
788 | skb_set_network_header(skb, nh); | |
789 | } | |
790 | ||
a16292a0 | 791 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
1da177e4 | 792 | |
0660e03f ACM |
793 | saddr = &ipv6_hdr(skb)->saddr; |
794 | daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 795 | |
39471ac8 | 796 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
ba7a46f1 JP |
797 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
798 | saddr, daddr); | |
39471ac8 | 799 | goto csum_error; |
1da177e4 LT |
800 | } |
801 | ||
8cf22943 HX |
802 | if (!pskb_pull(skb, sizeof(*hdr))) |
803 | goto discard_it; | |
1da177e4 | 804 | |
cc70ab26 | 805 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
806 | |
807 | type = hdr->icmp6_type; | |
808 | ||
f3832ed2 | 809 | ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); |
1da177e4 LT |
810 | |
811 | switch (type) { | |
812 | case ICMPV6_ECHO_REQUEST: | |
813 | icmpv6_echo_reply(skb); | |
814 | break; | |
815 | ||
816 | case ICMPV6_ECHO_REPLY: | |
e3e32170 | 817 | success = ping_rcv(skb); |
1da177e4 LT |
818 | break; |
819 | ||
820 | case ICMPV6_PKT_TOOBIG: | |
821 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update | |
822 | standard destination cache. Seems, only "advanced" | |
823 | destination cache will allow to solve this problem | |
824 | --ANK (980726) | |
825 | */ | |
826 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
827 | goto discard_it; | |
cc70ab26 | 828 | hdr = icmp6_hdr(skb); |
1da177e4 LT |
829 | |
830 | /* | |
831 | * Drop through to notify | |
832 | */ | |
833 | ||
834 | case ICMPV6_DEST_UNREACH: | |
835 | case ICMPV6_TIME_EXCEED: | |
836 | case ICMPV6_PARAMPROB: | |
837 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
838 | break; | |
839 | ||
840 | case NDISC_ROUTER_SOLICITATION: | |
841 | case NDISC_ROUTER_ADVERTISEMENT: | |
842 | case NDISC_NEIGHBOUR_SOLICITATION: | |
843 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
844 | case NDISC_REDIRECT: | |
845 | ndisc_rcv(skb); | |
846 | break; | |
847 | ||
848 | case ICMPV6_MGM_QUERY: | |
849 | igmp6_event_query(skb); | |
850 | break; | |
851 | ||
852 | case ICMPV6_MGM_REPORT: | |
853 | igmp6_event_report(skb); | |
854 | break; | |
855 | ||
856 | case ICMPV6_MGM_REDUCTION: | |
857 | case ICMPV6_NI_QUERY: | |
858 | case ICMPV6_NI_REPLY: | |
859 | case ICMPV6_MLD2_REPORT: | |
860 | case ICMPV6_DHAAD_REQUEST: | |
861 | case ICMPV6_DHAAD_REPLY: | |
862 | case ICMPV6_MOBILE_PREFIX_SOL: | |
863 | case ICMPV6_MOBILE_PREFIX_ADV: | |
864 | break; | |
865 | ||
866 | default: | |
1da177e4 LT |
867 | /* informational */ |
868 | if (type & ICMPV6_INFOMSG_MASK) | |
869 | break; | |
870 | ||
4b3418fb BM |
871 | net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", |
872 | saddr, daddr); | |
ea85a0a2 | 873 | |
1ab1457c YH |
874 | /* |
875 | * error of unknown type. | |
876 | * must pass to upper level | |
1da177e4 LT |
877 | */ |
878 | ||
879 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); | |
3ff50b79 SH |
880 | } |
881 | ||
e3e32170 RJ |
882 | /* until the v6 path can be better sorted assume failure and |
883 | * preserve the status quo behaviour for the rest of the paths to here | |
884 | */ | |
885 | if (success) | |
886 | consume_skb(skb); | |
887 | else | |
888 | kfree_skb(skb); | |
889 | ||
1da177e4 LT |
890 | return 0; |
891 | ||
6a5dc9e5 | 892 | csum_error: |
a16292a0 | 893 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); |
1da177e4 | 894 | discard_it: |
a16292a0 | 895 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
8b7817f3 | 896 | drop_no_count: |
1da177e4 LT |
897 | kfree_skb(skb); |
898 | return 0; | |
899 | } | |
900 | ||
4c9483b2 | 901 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
95e41e93 YH |
902 | u8 type, |
903 | const struct in6_addr *saddr, | |
904 | const struct in6_addr *daddr, | |
905 | int oif) | |
906 | { | |
4c9483b2 | 907 | memset(fl6, 0, sizeof(*fl6)); |
4e3fd7a0 AD |
908 | fl6->saddr = *saddr; |
909 | fl6->daddr = *daddr; | |
67ba4152 | 910 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1958b856 DM |
911 | fl6->fl6_icmp_type = type; |
912 | fl6->fl6_icmp_code = 0; | |
4c9483b2 DM |
913 | fl6->flowi6_oif = oif; |
914 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
95e41e93 YH |
915 | } |
916 | ||
98c6d1b2 | 917 | static int __net_init icmpv6_sk_init(struct net *net) |
1da177e4 LT |
918 | { |
919 | struct sock *sk; | |
920 | int err, i, j; | |
921 | ||
98c6d1b2 DL |
922 | net->ipv6.icmp_sk = |
923 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); | |
63159f29 | 924 | if (!net->ipv6.icmp_sk) |
79c91159 DL |
925 | return -ENOMEM; |
926 | ||
6f912042 | 927 | for_each_possible_cpu(i) { |
1ed8516f DL |
928 | err = inet_ctl_sock_create(&sk, PF_INET6, |
929 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 930 | if (err < 0) { |
f3213831 | 931 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
1da177e4 LT |
932 | err); |
933 | goto fail; | |
934 | } | |
935 | ||
1ed8516f | 936 | net->ipv6.icmp_sk[i] = sk; |
5c8cafd6 | 937 | |
1da177e4 LT |
938 | /* Enough space for 2 64K ICMP packets, including |
939 | * sk_buff struct overhead. | |
940 | */ | |
87fb4b7b | 941 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1da177e4 | 942 | } |
1da177e4 LT |
943 | return 0; |
944 | ||
945 | fail: | |
5c8cafd6 | 946 | for (j = 0; j < i; j++) |
1ed8516f | 947 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
98c6d1b2 | 948 | kfree(net->ipv6.icmp_sk); |
1da177e4 LT |
949 | return err; |
950 | } | |
951 | ||
98c6d1b2 | 952 | static void __net_exit icmpv6_sk_exit(struct net *net) |
1da177e4 LT |
953 | { |
954 | int i; | |
955 | ||
6f912042 | 956 | for_each_possible_cpu(i) { |
1ed8516f | 957 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
1da177e4 | 958 | } |
98c6d1b2 DL |
959 | kfree(net->ipv6.icmp_sk); |
960 | } | |
961 | ||
8ed7edce | 962 | static struct pernet_operations icmpv6_sk_ops = { |
67ba4152 IM |
963 | .init = icmpv6_sk_init, |
964 | .exit = icmpv6_sk_exit, | |
98c6d1b2 DL |
965 | }; |
966 | ||
967 | int __init icmpv6_init(void) | |
968 | { | |
969 | int err; | |
970 | ||
971 | err = register_pernet_subsys(&icmpv6_sk_ops); | |
972 | if (err < 0) | |
973 | return err; | |
974 | ||
975 | err = -EAGAIN; | |
976 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) | |
977 | goto fail; | |
5f5624cf PS |
978 | |
979 | err = inet6_register_icmp_sender(icmp6_send); | |
980 | if (err) | |
981 | goto sender_reg_err; | |
98c6d1b2 DL |
982 | return 0; |
983 | ||
5f5624cf PS |
984 | sender_reg_err: |
985 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); | |
98c6d1b2 | 986 | fail: |
f3213831 | 987 | pr_err("Failed to register ICMP6 protocol\n"); |
98c6d1b2 DL |
988 | unregister_pernet_subsys(&icmpv6_sk_ops); |
989 | return err; | |
990 | } | |
991 | ||
8ed7edce | 992 | void icmpv6_cleanup(void) |
98c6d1b2 | 993 | { |
5f5624cf | 994 | inet6_unregister_icmp_sender(icmp6_send); |
98c6d1b2 | 995 | unregister_pernet_subsys(&icmpv6_sk_ops); |
1da177e4 LT |
996 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
997 | } | |
998 | ||
98c6d1b2 | 999 | |
9b5b5cff | 1000 | static const struct icmp6_err { |
1da177e4 LT |
1001 | int err; |
1002 | int fatal; | |
1003 | } tab_unreach[] = { | |
1004 | { /* NOROUTE */ | |
1005 | .err = ENETUNREACH, | |
1006 | .fatal = 0, | |
1007 | }, | |
1008 | { /* ADM_PROHIBITED */ | |
1009 | .err = EACCES, | |
1010 | .fatal = 1, | |
1011 | }, | |
1012 | { /* Was NOT_NEIGHBOUR, now reserved */ | |
1013 | .err = EHOSTUNREACH, | |
1014 | .fatal = 0, | |
1015 | }, | |
1016 | { /* ADDR_UNREACH */ | |
1017 | .err = EHOSTUNREACH, | |
1018 | .fatal = 0, | |
1019 | }, | |
1020 | { /* PORT_UNREACH */ | |
1021 | .err = ECONNREFUSED, | |
1022 | .fatal = 1, | |
1023 | }, | |
61e76b17 JB |
1024 | { /* POLICY_FAIL */ |
1025 | .err = EACCES, | |
1026 | .fatal = 1, | |
1027 | }, | |
1028 | { /* REJECT_ROUTE */ | |
1029 | .err = EACCES, | |
1030 | .fatal = 1, | |
1031 | }, | |
1da177e4 LT |
1032 | }; |
1033 | ||
d5fdd6ba | 1034 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1da177e4 LT |
1035 | { |
1036 | int fatal = 0; | |
1037 | ||
1038 | *err = EPROTO; | |
1039 | ||
1040 | switch (type) { | |
1041 | case ICMPV6_DEST_UNREACH: | |
1042 | fatal = 1; | |
61e76b17 | 1043 | if (code < ARRAY_SIZE(tab_unreach)) { |
1da177e4 LT |
1044 | *err = tab_unreach[code].err; |
1045 | fatal = tab_unreach[code].fatal; | |
1046 | } | |
1047 | break; | |
1048 | ||
1049 | case ICMPV6_PKT_TOOBIG: | |
1050 | *err = EMSGSIZE; | |
1051 | break; | |
1ab1457c | 1052 | |
1da177e4 LT |
1053 | case ICMPV6_PARAMPROB: |
1054 | *err = EPROTO; | |
1055 | fatal = 1; | |
1056 | break; | |
1057 | ||
1058 | case ICMPV6_TIME_EXCEED: | |
1059 | *err = EHOSTUNREACH; | |
1060 | break; | |
3ff50b79 | 1061 | } |
1da177e4 LT |
1062 | |
1063 | return fatal; | |
1064 | } | |
7159039a YH |
1065 | EXPORT_SYMBOL(icmpv6_err_convert); |
1066 | ||
1da177e4 | 1067 | #ifdef CONFIG_SYSCTL |
e8243534 | 1068 | static struct ctl_table ipv6_icmp_table_template[] = { |
1da177e4 | 1069 | { |
1da177e4 | 1070 | .procname = "ratelimit", |
41a76906 | 1071 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1da177e4 LT |
1072 | .maxlen = sizeof(int), |
1073 | .mode = 0644, | |
6d9f239a | 1074 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 1075 | }, |
f8572d8f | 1076 | { }, |
1da177e4 | 1077 | }; |
760f2d01 | 1078 | |
2c8c1e72 | 1079 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
760f2d01 DL |
1080 | { |
1081 | struct ctl_table *table; | |
1082 | ||
1083 | table = kmemdup(ipv6_icmp_table_template, | |
1084 | sizeof(ipv6_icmp_table_template), | |
1085 | GFP_KERNEL); | |
5ee09105 | 1086 | |
c027aab4 | 1087 | if (table) |
5ee09105 YH |
1088 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
1089 | ||
760f2d01 DL |
1090 | return table; |
1091 | } | |
1da177e4 | 1092 | #endif |