1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Internet Control Message Protocol (ICMPv6) |
4 | * Linux INET6 implementation |
5 | * |
6 | * Authors: |
7 | * Pedro Roque <roque@di.fc.ul.pt> |
8 | * |
9 | * Based on net/ipv4/icmp.c |
10 | * |
11 | * RFC 1885 |
12 | */ |
13 | |
14 | /* |
15 | * Changes: |
16 | * |
17 | * Andi Kleen : exception handling |
18 | * Andi Kleen add rate limits. never reply to a icmp. |
19 | * add more length checks and other fixes. |
20 | * yoshfuji : ensure to sent parameter problem for |
21 | * fragments. |
22 | * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. |
23 | * Randy Dunlap and |
24 | * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support |
25 | * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data |
26 | */ |
27 | |
28 | #define pr_fmt(fmt) "IPv6: " fmt |
29 | |
30 | #include <linux/module.h> |
31 | #include <linux/errno.h> |
32 | #include <linux/types.h> |
33 | #include <linux/socket.h> |
34 | #include <linux/in.h> |
35 | #include <linux/kernel.h> |
36 | #include <linux/sockios.h> |
37 | #include <linux/net.h> |
38 | #include <linux/skbuff.h> |
39 | #include <linux/init.h> |
40 | #include <linux/netfilter.h> |
41 | #include <linux/slab.h> |
42 | |
43 | #ifdef CONFIG_SYSCTL |
44 | #include <linux/sysctl.h> |
45 | #endif |
46 | |
47 | #include <linux/inet.h> |
48 | #include <linux/netdevice.h> |
49 | #include <linux/icmpv6.h> |
50 | |
51 | #include <net/ip.h> |
52 | #include <net/sock.h> |
53 | |
54 | #include <net/ipv6.h> |
55 | #include <net/ip6_checksum.h> |
56 | #include <net/ping.h> |
57 | #include <net/protocol.h> |
58 | #include <net/raw.h> |
59 | #include <net/rawv6.h> |
60 | #include <net/seg6.h> |
61 | #include <net/transp_v6.h> |
62 | #include <net/ip6_route.h> |
63 | #include <net/addrconf.h> |
64 | #include <net/icmp.h> |
65 | #include <net/xfrm.h> |
66 | #include <net/inet_common.h> |
67 | #include <net/dsfield.h> |
68 | #include <net/l3mdev.h> |
69 | |
70 | #include <linux/uaccess.h> |
71 | |
72 | static DEFINE_PER_CPU(struct sock *, ipv6_icmp_sk); |
73 | |
74 | static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
75 | u8 type, u8 code, int offset, __be32 info) |
76 | { |
77 | /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ |
78 | struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); |
79 | struct net *net = dev_net(dev: skb->dev); |
80 | |
81 | if (type == ICMPV6_PKT_TOOBIG) |
82 | ip6_update_pmtu(skb, net, mtu: info, oif: skb->dev->ifindex, mark: 0, uid: sock_net_uid(net, NULL)); |
83 | else if (type == NDISC_REDIRECT) |
84 | ip6_redirect(skb, net, oif: skb->dev->ifindex, mark: 0, |
85 | uid: sock_net_uid(net, NULL)); |
86 | |
87 | if (!(type & ICMPV6_INFOMSG_MASK)) |
88 | if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) |
89 | ping_err(skb, offset, ntohl(info)); |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | static int icmpv6_rcv(struct sk_buff *skb); |
95 | |
96 | static const struct inet6_protocol icmpv6_protocol = { |
97 | .handler = icmpv6_rcv, |
98 | .err_handler = icmpv6_err, |
99 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
100 | }; |
101 | |
102 | /* Called with BH disabled */ |
103 | static struct sock *icmpv6_xmit_lock(struct net *net) |
104 | { |
105 | struct sock *sk; |
106 | |
107 | sk = this_cpu_read(ipv6_icmp_sk); |
108 | if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { |
109 | /* This can happen if the output path (f.e. SIT or |
110 | * ip6ip6 tunnel) signals dst_link_failure() for an |
111 | * outgoing ICMP6 packet. |
112 | */ |
113 | return NULL; |
114 | } |
115 | sock_net_set(sk, net); |
116 | return sk; |
117 | } |
118 | |
119 | static void icmpv6_xmit_unlock(struct sock *sk) |
120 | { |
121 | sock_net_set(sk, net: &init_net); |
122 | spin_unlock(lock: &sk->sk_lock.slock); |
123 | } |
124 | |
125 | /* |
126 | * Figure out, may we reply to this packet with icmp error. |
127 | * |
128 | * We do not reply, if: |
129 | * - it was icmp error message. |
130 | * - it is truncated, so that it is known, that protocol is ICMPV6 |
131 | * (i.e. in the middle of some exthdr) |
132 | * |
133 | * --ANK (980726) |
134 | */ |
135 | |
136 | static bool is_ineligible(const struct sk_buff *skb) |
137 | { |
138 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
139 | int len = skb->len - ptr; |
140 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
141 | __be16 frag_off; |
142 | |
143 | if (len < 0) |
144 | return true; |
145 | |
146 | ptr = ipv6_skip_exthdr(skb, start: ptr, nexthdrp: &nexthdr, frag_offp: &frag_off); |
147 | if (ptr < 0) |
148 | return false; |
149 | if (nexthdr == IPPROTO_ICMPV6) { |
150 | u8 _type, *tp; |
151 | tp = skb_header_pointer(skb, |
152 | offset: ptr+offsetof(struct icmp6hdr, icmp6_type), |
153 | len: sizeof(_type), buffer: &_type); |
154 | |
155 | /* Based on RFC 8200, Section 4.5 Fragment Header, return |
156 | * false if this is a fragment packet with no icmp header info. |
157 | */ |
158 | if (!tp && frag_off != 0) |
159 | return false; |
160 | else if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) |
161 | return true; |
162 | } |
163 | return false; |
164 | } |
165 | |
166 | static bool icmpv6_mask_allow(struct net *net, int type) |
167 | { |
168 | if (type > ICMPV6_MSG_MAX) |
169 | return true; |
170 | |
171 | /* Limit if icmp type is set in ratemask. */ |
172 | if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask)) |
173 | return true; |
174 | |
175 | return false; |
176 | } |
177 | |
178 | static bool icmpv6_global_allow(struct net *net, int type) |
179 | { |
180 | if (icmpv6_mask_allow(net, type)) |
181 | return true; |
182 | |
183 | if (icmp_global_allow()) |
184 | return true; |
185 | |
186 | __ICMP_INC_STATS(net, ICMP_MIB_RATELIMITGLOBAL); |
187 | return false; |
188 | } |
189 | |
190 | /* |
191 | * Check the ICMP output rate limit |
192 | */ |
193 | static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, |
194 | struct flowi6 *fl6) |
195 | { |
196 | struct net *net = sock_net(sk); |
197 | struct dst_entry *dst; |
198 | bool res = false; |
199 | |
200 | if (icmpv6_mask_allow(net, type)) |
201 | return true; |
202 | |
203 | /* |
204 | * Look up the output route. |
205 | * XXX: perhaps the expire for routing entries cloned by |
206 | * this lookup should be more aggressive (not longer than timeout). |
207 | */ |
208 | dst = ip6_route_output(net, sk, fl6); |
209 | if (dst->error) { |
210 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
211 | IPSTATS_MIB_OUTNOROUTES); |
212 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
213 | res = true; |
214 | } else { |
215 | struct rt6_info *rt = (struct rt6_info *)dst; |
216 | int tmo = net->ipv6.sysctl.icmpv6_time; |
217 | struct inet_peer *peer; |
218 | |
219 | /* Give more bandwidth to wider prefixes. */ |
220 | if (rt->rt6i_dst.plen < 128) |
221 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); |
222 | |
223 | peer = inet_getpeer_v6(base: net->ipv6.peers, v6daddr: &fl6->daddr, create: 1); |
224 | res = inet_peer_xrlim_allow(peer, timeout: tmo); |
225 | if (peer) |
226 | inet_putpeer(p: peer); |
227 | } |
228 | if (!res) |
229 | __ICMP6_INC_STATS(net, ip6_dst_idev(dst), |
230 | ICMP6_MIB_RATELIMITHOST); |
231 | dst_release(dst); |
232 | return res; |
233 | } |
234 | |
235 | static bool icmpv6_rt_has_prefsrc(struct sock *sk, u8 type, |
236 | struct flowi6 *fl6) |
237 | { |
238 | struct net *net = sock_net(sk); |
239 | struct dst_entry *dst; |
240 | bool res = false; |
241 | |
242 | dst = ip6_route_output(net, sk, fl6); |
243 | if (!dst->error) { |
244 | struct rt6_info *rt = (struct rt6_info *)dst; |
245 | struct in6_addr prefsrc; |
246 | |
247 | rt6_get_prefsrc(rt, addr: &prefsrc); |
248 | res = !ipv6_addr_any(a: &prefsrc); |
249 | } |
250 | dst_release(dst); |
251 | return res; |
252 | } |
253 | |
254 | /* |
255 | * an inline helper for the "simple" if statement below |
256 | * checks if parameter problem report is caused by an |
257 | * unrecognized IPv6 option that has the Option Type |
258 | * highest-order two bits set to 10 |
259 | */ |
260 | |
261 | static bool opt_unrec(struct sk_buff *skb, __u32 offset) |
262 | { |
263 | u8 _optval, *op; |
264 | |
265 | offset += skb_network_offset(skb); |
266 | op = skb_header_pointer(skb, offset, len: sizeof(_optval), buffer: &_optval); |
267 | if (!op) |
268 | return true; |
269 | return (*op & 0xC0) == 0x80; |
270 | } |
271 | |
272 | void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
273 | struct icmp6hdr *thdr, int len) |
274 | { |
275 | struct sk_buff *skb; |
276 | struct icmp6hdr *icmp6h; |
277 | |
278 | skb = skb_peek(list_: &sk->sk_write_queue); |
279 | if (!skb) |
280 | return; |
281 | |
282 | icmp6h = icmp6_hdr(skb); |
283 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
284 | icmp6h->icmp6_cksum = 0; |
285 | |
286 | if (skb_queue_len(list_: &sk->sk_write_queue) == 1) { |
287 | skb->csum = csum_partial(buff: icmp6h, |
288 | len: sizeof(struct icmp6hdr), sum: skb->csum); |
289 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr: &fl6->saddr, |
290 | daddr: &fl6->daddr, |
291 | len, proto: fl6->flowi6_proto, |
292 | sum: skb->csum); |
293 | } else { |
294 | __wsum tmp_csum = 0; |
295 | |
296 | skb_queue_walk(&sk->sk_write_queue, skb) { |
297 | tmp_csum = csum_add(csum: tmp_csum, addend: skb->csum); |
298 | } |
299 | |
300 | tmp_csum = csum_partial(buff: icmp6h, |
301 | len: sizeof(struct icmp6hdr), sum: tmp_csum); |
302 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr: &fl6->saddr, |
303 | daddr: &fl6->daddr, |
304 | len, proto: fl6->flowi6_proto, |
305 | sum: tmp_csum); |
306 | } |
307 | ip6_push_pending_frames(sk); |
308 | } |
309 | |
310 | struct icmpv6_msg { |
311 | struct sk_buff *skb; |
312 | int offset; |
313 | uint8_t type; |
314 | }; |
315 | |
316 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) |
317 | { |
318 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; |
319 | struct sk_buff *org_skb = msg->skb; |
320 | __wsum csum; |
321 | |
322 | csum = skb_copy_and_csum_bits(skb: org_skb, offset: msg->offset + offset, |
323 | to, len); |
324 | skb->csum = csum_block_add(csum: skb->csum, csum2: csum, offset: odd); |
325 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
326 | nf_ct_attach(skb, org_skb); |
327 | return 0; |
328 | } |
329 | |
330 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
331 | static void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) |
332 | { |
333 | struct ipv6hdr *iph = ipv6_hdr(skb); |
334 | struct ipv6_destopt_hao *hao; |
335 | int off; |
336 | |
337 | if (opt->dsthao) { |
338 | off = ipv6_find_tlv(skb, offset: opt->dsthao, IPV6_TLV_HAO); |
339 | if (likely(off >= 0)) { |
340 | hao = (struct ipv6_destopt_hao *) |
341 | (skb_network_header(skb) + off); |
342 | swap(iph->saddr, hao->addr); |
343 | } |
344 | } |
345 | } |
346 | #else |
347 | static inline void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) {} |
348 | #endif |
349 | |
350 | static struct dst_entry *icmpv6_route_lookup(struct net *net, |
351 | struct sk_buff *skb, |
352 | struct sock *sk, |
353 | struct flowi6 *fl6) |
354 | { |
355 | struct dst_entry *dst, *dst2; |
356 | struct flowi6 fl2; |
357 | int err; |
358 | |
359 | err = ip6_dst_lookup(net, sk, dst: &dst, fl6); |
360 | if (err) |
361 | return ERR_PTR(error: err); |
362 | |
363 | /* |
364 | * We won't send icmp if the destination is known |
365 | * anycast unless we need to treat anycast as unicast. |
366 | */ |
367 | if (!READ_ONCE(net->ipv6.sysctl.icmpv6_error_anycast_as_unicast) && |
368 | ipv6_anycast_destination(dst, daddr: &fl6->daddr)) { |
369 | net_dbg_ratelimited("icmp6_send: acast source\n" ); |
370 | dst_release(dst); |
371 | return ERR_PTR(error: -EINVAL); |
372 | } |
373 | |
374 | /* No need to clone since we're just using its address. */ |
375 | dst2 = dst; |
376 | |
377 | dst = xfrm_lookup(net, dst_orig: dst, fl: flowi6_to_flowi(fl6), sk, flags: 0); |
378 | if (!IS_ERR(ptr: dst)) { |
379 | if (dst != dst2) |
380 | return dst; |
381 | } else { |
382 | if (PTR_ERR(ptr: dst) == -EPERM) |
383 | dst = NULL; |
384 | else |
385 | return dst; |
386 | } |
387 | |
388 | err = xfrm_decode_session_reverse(net, skb, fl: flowi6_to_flowi(fl6: &fl2), AF_INET6); |
389 | if (err) |
390 | goto relookup_failed; |
391 | |
392 | err = ip6_dst_lookup(net, sk, dst: &dst2, fl6: &fl2); |
393 | if (err) |
394 | goto relookup_failed; |
395 | |
396 | dst2 = xfrm_lookup(net, dst_orig: dst2, fl: flowi6_to_flowi(fl6: &fl2), sk, flags: XFRM_LOOKUP_ICMP); |
397 | if (!IS_ERR(ptr: dst2)) { |
398 | dst_release(dst); |
399 | dst = dst2; |
400 | } else { |
401 | err = PTR_ERR(ptr: dst2); |
402 | if (err == -EPERM) { |
403 | dst_release(dst); |
404 | return dst2; |
405 | } else |
406 | goto relookup_failed; |
407 | } |
408 | |
409 | relookup_failed: |
410 | if (dst) |
411 | return dst; |
412 | return ERR_PTR(error: err); |
413 | } |
414 | |
415 | static struct net_device *icmp6_dev(const struct sk_buff *skb) |
416 | { |
417 | struct net_device *dev = skb->dev; |
418 | |
419 | /* for local traffic to local address, skb dev is the loopback |
420 | * device. Check if there is a dst attached to the skb and if so |
421 | * get the real device index. Same is needed for replies to a link |
422 | * local address on a device enslaved to an L3 master device |
423 | */ |
424 | if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { |
425 | const struct rt6_info *rt6 = skb_rt6_info(skb); |
426 | |
427 | /* The destination could be an external IP in Ext Hdr (SRv6, RPL, etc.), |
428 | * and ip6_null_entry could be set to skb if no route is found. |
429 | */ |
430 | if (rt6 && rt6->rt6i_idev) |
431 | dev = rt6->rt6i_idev->dev; |
432 | } |
433 | |
434 | return dev; |
435 | } |
436 | |
437 | static int icmp6_iif(const struct sk_buff *skb) |
438 | { |
439 | return icmp6_dev(skb)->ifindex; |
440 | } |
441 | |
442 | /* |
443 | * Send an ICMP message in response to a packet in error |
444 | */ |
445 | void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, |
446 | const struct in6_addr *force_saddr, |
447 | const struct inet6_skb_parm *parm) |
448 | { |
449 | struct inet6_dev *idev = NULL; |
450 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
451 | struct sock *sk; |
452 | struct net *net; |
453 | struct ipv6_pinfo *np; |
454 | const struct in6_addr *saddr = NULL; |
455 | struct dst_entry *dst; |
456 | struct icmp6hdr tmp_hdr; |
457 | struct flowi6 fl6; |
458 | struct icmpv6_msg msg; |
459 | struct ipcm6_cookie ipc6; |
460 | int iif = 0; |
461 | int addr_type = 0; |
462 | int len; |
463 | u32 mark; |
464 | |
465 | if ((u8 *)hdr < skb->head || |
466 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
467 | return; |
468 | |
469 | if (!skb->dev) |
470 | return; |
471 | net = dev_net(dev: skb->dev); |
472 | mark = IP6_REPLY_MARK(net, skb->mark); |
473 | /* |
474 | * Make sure we respect the rules |
475 | * i.e. RFC 1885 2.4(e) |
476 | * Rule (e.1) is enforced by not using icmp6_send |
477 | * in any code that processes icmp errors. |
478 | */ |
479 | addr_type = ipv6_addr_type(addr: &hdr->daddr); |
480 | |
481 | if (ipv6_chk_addr(net, addr: &hdr->daddr, dev: skb->dev, strict: 0) || |
482 | ipv6_chk_acast_addr_src(net, dev: skb->dev, addr: &hdr->daddr)) |
483 | saddr = &hdr->daddr; |
484 | |
485 | /* |
486 | * Dest addr check |
487 | */ |
488 | |
489 | if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { |
490 | if (type != ICMPV6_PKT_TOOBIG && |
491 | !(type == ICMPV6_PARAMPROB && |
492 | code == ICMPV6_UNK_OPTION && |
493 | (opt_unrec(skb, offset: info)))) |
494 | return; |
495 | |
496 | saddr = NULL; |
497 | } |
498 | |
499 | addr_type = ipv6_addr_type(addr: &hdr->saddr); |
500 | |
501 | /* |
502 | * Source addr check |
503 | */ |
504 | |
505 | if (__ipv6_addr_needs_scope_id(type: addr_type)) { |
506 | iif = icmp6_iif(skb); |
507 | } else { |
508 | /* |
509 | * The source device is used for looking up which routing table |
510 | * to use for sending an ICMP error. |
511 | */ |
512 | iif = l3mdev_master_ifindex(dev: skb->dev); |
513 | } |
514 | |
515 | /* |
516 | * Must not send error if the source does not uniquely |
517 | * identify a single node (RFC2463 Section 2.4). |
518 | * We check unspecified / multicast addresses here, |
519 | * and anycast addresses will be checked later. |
520 | */ |
521 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { |
522 | net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n" , |
523 | &hdr->saddr, &hdr->daddr); |
524 | return; |
525 | } |
526 | |
527 | /* |
528 | * Never answer to a ICMP packet. |
529 | */ |
530 | if (is_ineligible(skb)) { |
531 | net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n" , |
532 | &hdr->saddr, &hdr->daddr); |
533 | return; |
534 | } |
535 | |
536 | /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ |
537 | local_bh_disable(); |
538 | |
539 | /* Check global sysctl_icmp_msgs_per_sec ratelimit */ |
540 | if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) |
541 | goto out_bh_enable; |
542 | |
543 | mip6_addr_swap(skb, opt: parm); |
544 | |
545 | sk = icmpv6_xmit_lock(net); |
546 | if (!sk) |
547 | goto out_bh_enable; |
548 | |
549 | memset(&fl6, 0, sizeof(fl6)); |
550 | fl6.flowi6_proto = IPPROTO_ICMPV6; |
551 | fl6.daddr = hdr->saddr; |
552 | if (force_saddr) |
553 | saddr = force_saddr; |
554 | if (saddr) { |
555 | fl6.saddr = *saddr; |
556 | } else if (!icmpv6_rt_has_prefsrc(sk, type, fl6: &fl6)) { |
557 | /* select a more meaningful saddr from input if */ |
558 | struct net_device *in_netdev; |
559 | |
560 | in_netdev = dev_get_by_index(net, ifindex: parm->iif); |
561 | if (in_netdev) { |
562 | ipv6_dev_get_saddr(net, dev: in_netdev, daddr: &fl6.daddr, |
563 | srcprefs: inet6_sk(sk: sk)->srcprefs, |
564 | saddr: &fl6.saddr); |
565 | dev_put(dev: in_netdev); |
566 | } |
567 | } |
568 | fl6.flowi6_mark = mark; |
569 | fl6.flowi6_oif = iif; |
570 | fl6.fl6_icmp_type = type; |
571 | fl6.fl6_icmp_code = code; |
572 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
573 | fl6.mp_hash = rt6_multipath_hash(net, fl6: &fl6, skb, NULL); |
574 | security_skb_classify_flow(skb, flic: flowi6_to_flowi_common(fl6: &fl6)); |
575 | |
576 | np = inet6_sk(sk: sk); |
577 | |
578 | if (!icmpv6_xrlim_allow(sk, type, fl6: &fl6)) |
579 | goto out; |
580 | |
581 | tmp_hdr.icmp6_type = type; |
582 | tmp_hdr.icmp6_code = code; |
583 | tmp_hdr.icmp6_cksum = 0; |
584 | tmp_hdr.icmp6_pointer = htonl(info); |
585 | |
586 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(addr: &fl6.daddr)) |
587 | fl6.flowi6_oif = np->mcast_oif; |
588 | else if (!fl6.flowi6_oif) |
589 | fl6.flowi6_oif = np->ucast_oif; |
590 | |
591 | ipcm6_init_sk(ipc6: &ipc6, sk); |
592 | ipc6.sockc.mark = mark; |
593 | fl6.flowlabel = ip6_make_flowinfo(tclass: ipc6.tclass, flowlabel: fl6.flowlabel); |
594 | |
595 | dst = icmpv6_route_lookup(net, skb, sk, fl6: &fl6); |
596 | if (IS_ERR(ptr: dst)) |
597 | goto out; |
598 | |
599 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6: &fl6, dst); |
600 | |
601 | msg.skb = skb; |
602 | msg.offset = skb_network_offset(skb); |
603 | msg.type = type; |
604 | |
605 | len = skb->len - msg.offset; |
606 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); |
607 | if (len < 0) { |
608 | net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n" , |
609 | &hdr->saddr, &hdr->daddr); |
610 | goto out_dst_release; |
611 | } |
612 | |
613 | rcu_read_lock(); |
614 | idev = __in6_dev_get(dev: skb->dev); |
615 | |
616 | if (ip6_append_data(sk, getfrag: icmpv6_getfrag, from: &msg, |
617 | length: len + sizeof(struct icmp6hdr), |
618 | transhdrlen: sizeof(struct icmp6hdr), |
619 | ipc6: &ipc6, fl6: &fl6, rt: (struct rt6_info *)dst, |
620 | MSG_DONTWAIT)) { |
621 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
622 | ip6_flush_pending_frames(sk); |
623 | } else { |
624 | icmpv6_push_pending_frames(sk, fl6: &fl6, thdr: &tmp_hdr, |
625 | len: len + sizeof(struct icmp6hdr)); |
626 | } |
627 | rcu_read_unlock(); |
628 | out_dst_release: |
629 | dst_release(dst); |
630 | out: |
631 | icmpv6_xmit_unlock(sk); |
632 | out_bh_enable: |
633 | local_bh_enable(); |
634 | } |
635 | EXPORT_SYMBOL(icmp6_send); |
636 | |
637 | /* Slightly more convenient version of icmp6_send with drop reasons. |
638 | */ |
639 | void icmpv6_param_prob_reason(struct sk_buff *skb, u8 code, int pos, |
640 | enum skb_drop_reason reason) |
641 | { |
642 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL, IP6CB(skb)); |
643 | kfree_skb_reason(skb, reason); |
644 | } |
645 | |
646 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH |
647 | * if sufficient data bytes are available |
648 | * @nhs is the size of the tunnel header(s) : |
649 | * Either an IPv4 header for SIT encap |
650 | * an IPv4 header + GRE header for GRE encap |
651 | */ |
652 | int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, |
653 | unsigned int data_len) |
654 | { |
655 | struct in6_addr temp_saddr; |
656 | struct rt6_info *rt; |
657 | struct sk_buff *skb2; |
658 | u32 info = 0; |
659 | |
660 | if (!pskb_may_pull(skb, len: nhs + sizeof(struct ipv6hdr) + 8)) |
661 | return 1; |
662 | |
663 | /* RFC 4884 (partial) support for ICMP extensions */ |
664 | if (data_len < 128 || (data_len & 7) || skb->len < data_len) |
665 | data_len = 0; |
666 | |
667 | skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); |
668 | |
669 | if (!skb2) |
670 | return 1; |
671 | |
672 | skb_dst_drop(skb: skb2); |
673 | skb_pull(skb: skb2, len: nhs); |
674 | skb_reset_network_header(skb: skb2); |
675 | |
676 | rt = rt6_lookup(net: dev_net(dev: skb->dev), daddr: &ipv6_hdr(skb: skb2)->saddr, NULL, oif: 0, |
677 | skb, flags: 0); |
678 | |
679 | if (rt && rt->dst.dev) |
680 | skb2->dev = rt->dst.dev; |
681 | |
682 | ipv6_addr_set_v4mapped(addr: ip_hdr(skb)->saddr, v4mapped: &temp_saddr); |
683 | |
684 | if (data_len) { |
685 | /* RFC 4884 (partial) support : |
686 | * insert 0 padding at the end, before the extensions |
687 | */ |
688 | __skb_push(skb: skb2, len: nhs); |
689 | skb_reset_network_header(skb: skb2); |
690 | memmove(skb2->data, skb2->data + nhs, data_len - nhs); |
691 | memset(skb2->data + data_len - nhs, 0, nhs); |
692 | /* RFC 4884 4.5 : Length is measured in 64-bit words, |
693 | * and stored in reserved[0] |
694 | */ |
695 | info = (data_len/8) << 24; |
696 | } |
697 | if (type == ICMP_TIME_EXCEEDED) |
698 | icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
699 | info, &temp_saddr, IP6CB(skb2)); |
700 | else |
701 | icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, |
702 | info, &temp_saddr, IP6CB(skb2)); |
703 | if (rt) |
704 | ip6_rt_put(rt); |
705 | |
706 | kfree_skb(skb: skb2); |
707 | |
708 | return 0; |
709 | } |
710 | EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); |
711 | |
712 | static enum skb_drop_reason icmpv6_echo_reply(struct sk_buff *skb) |
713 | { |
714 | struct net *net = dev_net(dev: skb->dev); |
715 | struct sock *sk; |
716 | struct inet6_dev *idev; |
717 | struct ipv6_pinfo *np; |
718 | const struct in6_addr *saddr = NULL; |
719 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
720 | struct icmp6hdr tmp_hdr; |
721 | struct flowi6 fl6; |
722 | struct icmpv6_msg msg; |
723 | struct dst_entry *dst; |
724 | struct ipcm6_cookie ipc6; |
725 | u32 mark = IP6_REPLY_MARK(net, skb->mark); |
726 | SKB_DR(reason); |
727 | bool acast; |
728 | u8 type; |
729 | |
730 | if (ipv6_addr_is_multicast(addr: &ipv6_hdr(skb)->daddr) && |
731 | net->ipv6.sysctl.icmpv6_echo_ignore_multicast) |
732 | return reason; |
733 | |
734 | saddr = &ipv6_hdr(skb)->daddr; |
735 | |
736 | acast = ipv6_anycast_destination(dst: skb_dst(skb), daddr: saddr); |
737 | if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) |
738 | return reason; |
739 | |
740 | if (!ipv6_unicast_destination(skb) && |
741 | !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) |
742 | saddr = NULL; |
743 | |
744 | if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) |
745 | type = ICMPV6_EXT_ECHO_REPLY; |
746 | else |
747 | type = ICMPV6_ECHO_REPLY; |
748 | |
749 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); |
750 | tmp_hdr.icmp6_type = type; |
751 | |
752 | memset(&fl6, 0, sizeof(fl6)); |
753 | if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) |
754 | fl6.flowlabel = ip6_flowlabel(hdr: ipv6_hdr(skb)); |
755 | |
756 | fl6.flowi6_proto = IPPROTO_ICMPV6; |
757 | fl6.daddr = ipv6_hdr(skb)->saddr; |
758 | if (saddr) |
759 | fl6.saddr = *saddr; |
760 | fl6.flowi6_oif = icmp6_iif(skb); |
761 | fl6.fl6_icmp_type = type; |
762 | fl6.flowi6_mark = mark; |
763 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
764 | security_skb_classify_flow(skb, flic: flowi6_to_flowi_common(fl6: &fl6)); |
765 | |
766 | local_bh_disable(); |
767 | sk = icmpv6_xmit_lock(net); |
768 | if (!sk) |
769 | goto out_bh_enable; |
770 | np = inet6_sk(sk: sk); |
771 | |
772 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(addr: &fl6.daddr)) |
773 | fl6.flowi6_oif = np->mcast_oif; |
774 | else if (!fl6.flowi6_oif) |
775 | fl6.flowi6_oif = np->ucast_oif; |
776 | |
777 | if (ip6_dst_lookup(net, sk, dst: &dst, fl6: &fl6)) |
778 | goto out; |
779 | dst = xfrm_lookup(net, dst_orig: dst, fl: flowi6_to_flowi(fl6: &fl6), sk, flags: 0); |
780 | if (IS_ERR(ptr: dst)) |
781 | goto out; |
782 | |
783 | /* Check the ratelimit */ |
784 | if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || |
785 | !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, fl6: &fl6)) |
786 | goto out_dst_release; |
787 | |
788 | idev = __in6_dev_get(dev: skb->dev); |
789 | |
790 | msg.skb = skb; |
791 | msg.offset = 0; |
792 | msg.type = type; |
793 | |
794 | ipcm6_init_sk(ipc6: &ipc6, sk); |
795 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6: &fl6, dst); |
796 | ipc6.tclass = ipv6_get_dsfield(ipv6h: ipv6_hdr(skb)); |
797 | ipc6.sockc.mark = mark; |
798 | |
799 | if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) |
800 | if (!icmp_build_probe(skb, icmphdr: (struct icmphdr *)&tmp_hdr)) |
801 | goto out_dst_release; |
802 | |
803 | if (ip6_append_data(sk, getfrag: icmpv6_getfrag, from: &msg, |
804 | length: skb->len + sizeof(struct icmp6hdr), |
805 | transhdrlen: sizeof(struct icmp6hdr), ipc6: &ipc6, fl6: &fl6, |
806 | rt: (struct rt6_info *)dst, MSG_DONTWAIT)) { |
807 | __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); |
808 | ip6_flush_pending_frames(sk); |
809 | } else { |
810 | icmpv6_push_pending_frames(sk, fl6: &fl6, thdr: &tmp_hdr, |
811 | len: skb->len + sizeof(struct icmp6hdr)); |
812 | reason = SKB_CONSUMED; |
813 | } |
814 | out_dst_release: |
815 | dst_release(dst); |
816 | out: |
817 | icmpv6_xmit_unlock(sk); |
818 | out_bh_enable: |
819 | local_bh_enable(); |
820 | return reason; |
821 | } |
822 | |
823 | enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, |
824 | u8 code, __be32 info) |
825 | { |
826 | struct inet6_skb_parm *opt = IP6CB(skb); |
827 | struct net *net = dev_net(dev: skb->dev); |
828 | const struct inet6_protocol *ipprot; |
829 | enum skb_drop_reason reason; |
830 | int inner_offset; |
831 | __be16 frag_off; |
832 | u8 nexthdr; |
833 | |
834 | reason = pskb_may_pull_reason(skb, len: sizeof(struct ipv6hdr)); |
835 | if (reason != SKB_NOT_DROPPED_YET) |
836 | goto out; |
837 | |
838 | seg6_icmp_srh(skb, opt); |
839 | |
840 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; |
841 | if (ipv6_ext_hdr(nexthdr)) { |
842 | /* now skip over extension headers */ |
843 | inner_offset = ipv6_skip_exthdr(skb, start: sizeof(struct ipv6hdr), |
844 | nexthdrp: &nexthdr, frag_offp: &frag_off); |
845 | if (inner_offset < 0) { |
846 | SKB_DR_SET(reason, IPV6_BAD_EXTHDR); |
847 | goto out; |
848 | } |
849 | } else { |
850 | inner_offset = sizeof(struct ipv6hdr); |
851 | } |
852 | |
853 | /* Checkin header including 8 bytes of inner protocol header. */ |
854 | reason = pskb_may_pull_reason(skb, len: inner_offset + 8); |
855 | if (reason != SKB_NOT_DROPPED_YET) |
856 | goto out; |
857 | |
858 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
859 | Without this we will not able f.e. to make source routed |
860 | pmtu discovery. |
861 | Corresponding argument (opt) to notifiers is already added. |
862 | --ANK (980726) |
863 | */ |
864 | |
865 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
866 | if (ipprot && ipprot->err_handler) |
867 | ipprot->err_handler(skb, opt, type, code, inner_offset, info); |
868 | |
869 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
870 | return SKB_CONSUMED; |
871 | |
872 | out: |
873 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
874 | return reason; |
875 | } |
876 | |
877 | /* |
878 | * Handle icmp messages |
879 | */ |
880 | |
881 | static int icmpv6_rcv(struct sk_buff *skb) |
882 | { |
883 | enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; |
884 | struct net *net = dev_net(dev: skb->dev); |
885 | struct net_device *dev = icmp6_dev(skb); |
886 | struct inet6_dev *idev = __in6_dev_get(dev); |
887 | const struct in6_addr *saddr, *daddr; |
888 | struct icmp6hdr *hdr; |
889 | u8 type; |
890 | |
891 | if (!xfrm6_policy_check(NULL, dir: XFRM_POLICY_IN, skb)) { |
892 | struct sec_path *sp = skb_sec_path(skb); |
893 | int nh; |
894 | |
895 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
896 | XFRM_STATE_ICMP)) { |
897 | reason = SKB_DROP_REASON_XFRM_POLICY; |
898 | goto drop_no_count; |
899 | } |
900 | |
901 | if (!pskb_may_pull(skb, len: sizeof(*hdr) + sizeof(struct ipv6hdr))) |
902 | goto drop_no_count; |
903 | |
904 | nh = skb_network_offset(skb); |
905 | skb_set_network_header(skb, offset: sizeof(*hdr)); |
906 | |
907 | if (!xfrm6_policy_check_reverse(NULL, dir: XFRM_POLICY_IN, |
908 | skb)) { |
909 | reason = SKB_DROP_REASON_XFRM_POLICY; |
910 | goto drop_no_count; |
911 | } |
912 | |
913 | skb_set_network_header(skb, offset: nh); |
914 | } |
915 | |
916 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
917 | |
918 | saddr = &ipv6_hdr(skb)->saddr; |
919 | daddr = &ipv6_hdr(skb)->daddr; |
920 | |
921 | if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { |
922 | net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n" , |
923 | saddr, daddr); |
924 | goto csum_error; |
925 | } |
926 | |
927 | if (!pskb_pull(skb, len: sizeof(*hdr))) |
928 | goto discard_it; |
929 | |
930 | hdr = icmp6_hdr(skb); |
931 | |
932 | type = hdr->icmp6_type; |
933 | |
934 | ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); |
935 | |
936 | switch (type) { |
937 | case ICMPV6_ECHO_REQUEST: |
938 | if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) |
939 | reason = icmpv6_echo_reply(skb); |
940 | break; |
941 | case ICMPV6_EXT_ECHO_REQUEST: |
942 | if (!net->ipv6.sysctl.icmpv6_echo_ignore_all && |
943 | READ_ONCE(net->ipv4.sysctl_icmp_echo_enable_probe)) |
944 | reason = icmpv6_echo_reply(skb); |
945 | break; |
946 | |
947 | case ICMPV6_ECHO_REPLY: |
948 | reason = ping_rcv(skb); |
949 | break; |
950 | |
951 | case ICMPV6_EXT_ECHO_REPLY: |
952 | reason = ping_rcv(skb); |
953 | break; |
954 | |
955 | case ICMPV6_PKT_TOOBIG: |
956 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update |
957 | standard destination cache. Seems, only "advanced" |
958 | destination cache will allow to solve this problem |
959 | --ANK (980726) |
960 | */ |
961 | if (!pskb_may_pull(skb, len: sizeof(struct ipv6hdr))) |
962 | goto discard_it; |
963 | hdr = icmp6_hdr(skb); |
964 | |
965 | /* to notify */ |
966 | fallthrough; |
967 | case ICMPV6_DEST_UNREACH: |
968 | case ICMPV6_TIME_EXCEED: |
969 | case ICMPV6_PARAMPROB: |
970 | reason = icmpv6_notify(skb, type, code: hdr->icmp6_code, |
971 | info: hdr->icmp6_mtu); |
972 | break; |
973 | |
974 | case NDISC_ROUTER_SOLICITATION: |
975 | case NDISC_ROUTER_ADVERTISEMENT: |
976 | case NDISC_NEIGHBOUR_SOLICITATION: |
977 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
978 | case NDISC_REDIRECT: |
979 | reason = ndisc_rcv(skb); |
980 | break; |
981 | |
982 | case ICMPV6_MGM_QUERY: |
983 | igmp6_event_query(skb); |
984 | return 0; |
985 | |
986 | case ICMPV6_MGM_REPORT: |
987 | igmp6_event_report(skb); |
988 | return 0; |
989 | |
990 | case ICMPV6_MGM_REDUCTION: |
991 | case ICMPV6_NI_QUERY: |
992 | case ICMPV6_NI_REPLY: |
993 | case ICMPV6_MLD2_REPORT: |
994 | case ICMPV6_DHAAD_REQUEST: |
995 | case ICMPV6_DHAAD_REPLY: |
996 | case ICMPV6_MOBILE_PREFIX_SOL: |
997 | case ICMPV6_MOBILE_PREFIX_ADV: |
998 | break; |
999 | |
1000 | default: |
1001 | /* informational */ |
1002 | if (type & ICMPV6_INFOMSG_MASK) |
1003 | break; |
1004 | |
1005 | net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n" , |
1006 | saddr, daddr); |
1007 | |
1008 | /* |
1009 | * error of unknown type. |
1010 | * must pass to upper level |
1011 | */ |
1012 | |
1013 | reason = icmpv6_notify(skb, type, code: hdr->icmp6_code, |
1014 | info: hdr->icmp6_mtu); |
1015 | } |
1016 | |
1017 | /* until the v6 path can be better sorted assume failure and |
1018 | * preserve the status quo behaviour for the rest of the paths to here |
1019 | */ |
1020 | if (reason) |
1021 | kfree_skb_reason(skb, reason); |
1022 | else |
1023 | consume_skb(skb); |
1024 | |
1025 | return 0; |
1026 | |
1027 | csum_error: |
1028 | reason = SKB_DROP_REASON_ICMP_CSUM; |
1029 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); |
1030 | discard_it: |
1031 | __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
1032 | drop_no_count: |
1033 | kfree_skb_reason(skb, reason); |
1034 | return 0; |
1035 | } |
1036 | |
1037 | void icmpv6_flow_init(const struct sock *sk, struct flowi6 *fl6, u8 type, |
1038 | const struct in6_addr *saddr, |
1039 | const struct in6_addr *daddr, int oif) |
1040 | { |
1041 | memset(fl6, 0, sizeof(*fl6)); |
1042 | fl6->saddr = *saddr; |
1043 | fl6->daddr = *daddr; |
1044 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
1045 | fl6->fl6_icmp_type = type; |
1046 | fl6->fl6_icmp_code = 0; |
1047 | fl6->flowi6_oif = oif; |
1048 | security_sk_classify_flow(sk, flic: flowi6_to_flowi_common(fl6)); |
1049 | } |
1050 | |
1051 | int __init icmpv6_init(void) |
1052 | { |
1053 | struct sock *sk; |
1054 | int err, i; |
1055 | |
1056 | for_each_possible_cpu(i) { |
1057 | err = inet_ctl_sock_create(sk: &sk, PF_INET6, |
1058 | type: SOCK_RAW, IPPROTO_ICMPV6, net: &init_net); |
1059 | if (err < 0) { |
1060 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n" , |
1061 | err); |
1062 | return err; |
1063 | } |
1064 | |
1065 | per_cpu(ipv6_icmp_sk, i) = sk; |
1066 | |
1067 | /* Enough space for 2 64K ICMP packets, including |
1068 | * sk_buff struct overhead. |
1069 | */ |
1070 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
1071 | } |
1072 | |
1073 | err = -EAGAIN; |
1074 | if (inet6_add_protocol(prot: &icmpv6_protocol, IPPROTO_ICMPV6) < 0) |
1075 | goto fail; |
1076 | |
1077 | err = inet6_register_icmp_sender(fn: icmp6_send); |
1078 | if (err) |
1079 | goto sender_reg_err; |
1080 | return 0; |
1081 | |
1082 | sender_reg_err: |
1083 | inet6_del_protocol(prot: &icmpv6_protocol, IPPROTO_ICMPV6); |
1084 | fail: |
1085 | pr_err("Failed to register ICMP6 protocol\n" ); |
1086 | return err; |
1087 | } |
1088 | |
1089 | void icmpv6_cleanup(void) |
1090 | { |
1091 | inet6_unregister_icmp_sender(fn: icmp6_send); |
1092 | inet6_del_protocol(prot: &icmpv6_protocol, IPPROTO_ICMPV6); |
1093 | } |
1094 | |
1095 | |
1096 | static const struct icmp6_err { |
1097 | int err; |
1098 | int fatal; |
1099 | } tab_unreach[] = { |
1100 | { /* NOROUTE */ |
1101 | .err = ENETUNREACH, |
1102 | .fatal = 0, |
1103 | }, |
1104 | { /* ADM_PROHIBITED */ |
1105 | .err = EACCES, |
1106 | .fatal = 1, |
1107 | }, |
1108 | { /* Was NOT_NEIGHBOUR, now reserved */ |
1109 | .err = EHOSTUNREACH, |
1110 | .fatal = 0, |
1111 | }, |
1112 | { /* ADDR_UNREACH */ |
1113 | .err = EHOSTUNREACH, |
1114 | .fatal = 0, |
1115 | }, |
1116 | { /* PORT_UNREACH */ |
1117 | .err = ECONNREFUSED, |
1118 | .fatal = 1, |
1119 | }, |
1120 | { /* POLICY_FAIL */ |
1121 | .err = EACCES, |
1122 | .fatal = 1, |
1123 | }, |
1124 | { /* REJECT_ROUTE */ |
1125 | .err = EACCES, |
1126 | .fatal = 1, |
1127 | }, |
1128 | }; |
1129 | |
1130 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
1131 | { |
1132 | int fatal = 0; |
1133 | |
1134 | *err = EPROTO; |
1135 | |
1136 | switch (type) { |
1137 | case ICMPV6_DEST_UNREACH: |
1138 | fatal = 1; |
1139 | if (code < ARRAY_SIZE(tab_unreach)) { |
1140 | *err = tab_unreach[code].err; |
1141 | fatal = tab_unreach[code].fatal; |
1142 | } |
1143 | break; |
1144 | |
1145 | case ICMPV6_PKT_TOOBIG: |
1146 | *err = EMSGSIZE; |
1147 | break; |
1148 | |
1149 | case ICMPV6_PARAMPROB: |
1150 | *err = EPROTO; |
1151 | fatal = 1; |
1152 | break; |
1153 | |
1154 | case ICMPV6_TIME_EXCEED: |
1155 | *err = EHOSTUNREACH; |
1156 | break; |
1157 | } |
1158 | |
1159 | return fatal; |
1160 | } |
1161 | EXPORT_SYMBOL(icmpv6_err_convert); |
1162 | |
1163 | #ifdef CONFIG_SYSCTL |
1164 | static struct ctl_table ipv6_icmp_table_template[] = { |
1165 | { |
1166 | .procname = "ratelimit" , |
1167 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
1168 | .maxlen = sizeof(int), |
1169 | .mode = 0644, |
1170 | .proc_handler = proc_dointvec_ms_jiffies, |
1171 | }, |
1172 | { |
1173 | .procname = "echo_ignore_all" , |
1174 | .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, |
1175 | .maxlen = sizeof(u8), |
1176 | .mode = 0644, |
1177 | .proc_handler = proc_dou8vec_minmax, |
1178 | }, |
1179 | { |
1180 | .procname = "echo_ignore_multicast" , |
1181 | .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, |
1182 | .maxlen = sizeof(u8), |
1183 | .mode = 0644, |
1184 | .proc_handler = proc_dou8vec_minmax, |
1185 | }, |
1186 | { |
1187 | .procname = "echo_ignore_anycast" , |
1188 | .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, |
1189 | .maxlen = sizeof(u8), |
1190 | .mode = 0644, |
1191 | .proc_handler = proc_dou8vec_minmax, |
1192 | }, |
1193 | { |
1194 | .procname = "ratemask" , |
1195 | .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, |
1196 | .maxlen = ICMPV6_MSG_MAX + 1, |
1197 | .mode = 0644, |
1198 | .proc_handler = proc_do_large_bitmap, |
1199 | }, |
1200 | { |
1201 | .procname = "error_anycast_as_unicast" , |
1202 | .data = &init_net.ipv6.sysctl.icmpv6_error_anycast_as_unicast, |
1203 | .maxlen = sizeof(u8), |
1204 | .mode = 0644, |
1205 | .proc_handler = proc_dou8vec_minmax, |
1206 | .extra1 = SYSCTL_ZERO, |
1207 | .extra2 = SYSCTL_ONE, |
1208 | }, |
1209 | { }, |
1210 | }; |
1211 | |
1212 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
1213 | { |
1214 | struct ctl_table *table; |
1215 | |
1216 | table = kmemdup(p: ipv6_icmp_table_template, |
1217 | size: sizeof(ipv6_icmp_table_template), |
1218 | GFP_KERNEL); |
1219 | |
1220 | if (table) { |
1221 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
1222 | table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; |
1223 | table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; |
1224 | table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; |
1225 | table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; |
1226 | table[5].data = &net->ipv6.sysctl.icmpv6_error_anycast_as_unicast; |
1227 | } |
1228 | return table; |
1229 | } |
1230 | |
1231 | size_t ipv6_icmp_sysctl_table_size(void) |
1232 | { |
1233 | return ARRAY_SIZE(ipv6_icmp_table_template); |
1234 | } |
1235 | #endif |
1236 | |