1 /* 2 * Internet Control Message Protocol (ICMPv6) 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * $Id: icmp.c,v 1.38 2002/02/08 03:57:19 davem Exp $ 9 * 10 * Based on net/ipv4/icmp.c 11 * 12 * RFC 1885 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 */ 19 20 /* 21 * Changes: 22 * 23 * Andi Kleen : exception handling 24 * Andi Kleen add rate limits. never reply to a icmp. 25 * add more length checks and other fixes. 26 * yoshfuji : ensure to sent parameter problem for 27 * fragments. 28 * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 29 * Randy Dunlap and 30 * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 31 * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 32 */ 33 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> 40 #include <linux/sched.h> 41 #include <linux/sockios.h> 42 #include <linux/net.h> 43 #include <linux/skbuff.h> 44 #include <linux/init.h> 45 46 #ifdef CONFIG_SYSCTL 47 #include <linux/sysctl.h> 48 #endif 49 50 #include <linux/inet.h> 51 #include <linux/netdevice.h> 52 #include <linux/icmpv6.h> 53 54 #include <net/ip.h> 55 #include <net/sock.h> 56 57 #include <net/ipv6.h> 58 #include <net/ip6_checksum.h> 59 #include <net/protocol.h> 60 #include <net/raw.h> 61 #include <net/rawv6.h> 62 #include <net/transp_v6.h> 63 #include <net/ip6_route.h> 64 #include <net/addrconf.h> 65 #include <net/icmp.h> 66 67 #include <asm/uaccess.h> 68 #include <asm/system.h> 69 70 DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly; 71 72 /* 73 * The ICMP socket(s). This is the most convenient way to flow control 74 * our ICMP output as well as maintain a clean interface throughout 75 * all layers. All Socketless IP sends will soon be gone. 76 * 77 * On SMP we have one ICMP socket per-cpu. 78 */ 79 static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL; 80 #define icmpv6_socket __get_cpu_var(__icmpv6_socket) 81 82 static int icmpv6_rcv(struct sk_buff **pskb); 83 84 static struct inet6_protocol icmpv6_protocol = { 85 .handler = icmpv6_rcv, 86 .flags = INET6_PROTO_FINAL, 87 }; 88 89 static __inline__ int icmpv6_xmit_lock(void) 90 { 91 local_bh_disable(); 92 93 if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) { 94 /* This can happen if the output path (f.e. SIT or 95 * ip6ip6 tunnel) signals dst_link_failure() for an 96 * outgoing ICMP6 packet. 97 */ 98 local_bh_enable(); 99 return 1; 100 } 101 return 0; 102 } 103 104 static __inline__ void icmpv6_xmit_unlock(void) 105 { 106 spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock); 107 } 108 109 /* 110 * Slightly more convenient version of icmpv6_send. 111 */ 112 void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) 113 { 114 icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); 115 kfree_skb(skb); 116 } 117 118 /* 119 * Figure out, may we reply to this packet with icmp error. 120 * 121 * We do not reply, if: 122 * - it was icmp error message. 123 * - it is truncated, so that it is known, that protocol is ICMPV6 124 * (i.e. in the middle of some exthdr) 125 * 126 * --ANK (980726) 127 */ 128 129 static int is_ineligible(struct sk_buff *skb) 130 { 131 int ptr = (u8*)(skb->nh.ipv6h+1) - skb->data; 132 int len = skb->len - ptr; 133 __u8 nexthdr = skb->nh.ipv6h->nexthdr; 134 135 if (len < 0) 136 return 1; 137 138 ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 139 if (ptr < 0) 140 return 0; 141 if (nexthdr == IPPROTO_ICMPV6) { 142 u8 _type, *tp; 143 tp = skb_header_pointer(skb, 144 ptr+offsetof(struct icmp6hdr, icmp6_type), 145 sizeof(_type), &_type); 146 if (tp == NULL || 147 !(*tp & ICMPV6_INFOMSG_MASK)) 148 return 1; 149 } 150 return 0; 151 } 152 153 static int sysctl_icmpv6_time = 1*HZ; 154 155 /* 156 * Check the ICMP output rate limit 157 */ 158 static inline int icmpv6_xrlim_allow(struct sock *sk, int type, 159 struct flowi *fl) 160 { 161 struct dst_entry *dst; 162 int res = 0; 163 164 /* Informational messages are not limited. */ 165 if (type & ICMPV6_INFOMSG_MASK) 166 return 1; 167 168 /* Do not limit pmtu discovery, it would break it. */ 169 if (type == ICMPV6_PKT_TOOBIG) 170 return 1; 171 172 /* 173 * Look up the output route. 174 * XXX: perhaps the expire for routing entries cloned by 175 * this lookup should be more aggressive (not longer than timeout). 176 */ 177 dst = ip6_route_output(sk, fl); 178 if (dst->error) { 179 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); 180 } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 181 res = 1; 182 } else { 183 struct rt6_info *rt = (struct rt6_info *)dst; 184 int tmo = sysctl_icmpv6_time; 185 186 /* Give more bandwidth to wider prefixes. */ 187 if (rt->rt6i_dst.plen < 128) 188 tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 189 190 res = xrlim_allow(dst, tmo); 191 } 192 dst_release(dst); 193 return res; 194 } 195 196 /* 197 * an inline helper for the "simple" if statement below 198 * checks if parameter problem report is caused by an 199 * unrecognized IPv6 option that has the Option Type 200 * highest-order two bits set to 10 201 */ 202 203 static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 204 { 205 u8 _optval, *op; 206 207 offset += skb->nh.raw - skb->data; 208 op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 209 if (op == NULL) 210 return 1; 211 return (*op & 0xC0) == 0x80; 212 } 213 214 static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 215 { 216 struct sk_buff *skb; 217 struct icmp6hdr *icmp6h; 218 int err = 0; 219 220 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 221 goto out; 222 223 icmp6h = (struct icmp6hdr*) skb->h.raw; 224 memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 225 icmp6h->icmp6_cksum = 0; 226 227 if (skb_queue_len(&sk->sk_write_queue) == 1) { 228 skb->csum = csum_partial((char *)icmp6h, 229 sizeof(struct icmp6hdr), skb->csum); 230 icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 231 &fl->fl6_dst, 232 len, fl->proto, 233 skb->csum); 234 } else { 235 u32 tmp_csum = 0; 236 237 skb_queue_walk(&sk->sk_write_queue, skb) { 238 tmp_csum = csum_add(tmp_csum, skb->csum); 239 } 240 241 tmp_csum = csum_partial((char *)icmp6h, 242 sizeof(struct icmp6hdr), tmp_csum); 243 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 244 &fl->fl6_dst, 245 len, fl->proto, tmp_csum); 246 icmp6h->icmp6_cksum = tmp_csum; 247 } 248 if (icmp6h->icmp6_cksum == 0) 249 icmp6h->icmp6_cksum = -1; 250 ip6_push_pending_frames(sk); 251 out: 252 return err; 253 } 254 255 struct icmpv6_msg { 256 struct sk_buff *skb; 257 int offset; 258 }; 259 260 static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 261 { 262 struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 263 struct sk_buff *org_skb = msg->skb; 264 __u32 csum = 0; 265 266 csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 267 to, len, csum); 268 skb->csum = csum_block_add(skb->csum, csum, odd); 269 return 0; 270 } 271 272 /* 273 * Send an ICMP message in response to a packet in error 274 */ 275 void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 276 struct net_device *dev) 277 { 278 struct inet6_dev *idev = NULL; 279 struct ipv6hdr *hdr = skb->nh.ipv6h; 280 struct sock *sk; 281 struct ipv6_pinfo *np; 282 struct in6_addr *saddr = NULL; 283 struct dst_entry *dst; 284 struct icmp6hdr tmp_hdr; 285 struct flowi fl; 286 struct icmpv6_msg msg; 287 int iif = 0; 288 int addr_type = 0; 289 int len; 290 int hlimit, tclass; 291 int err = 0; 292 293 if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail) 294 return; 295 296 /* 297 * Make sure we respect the rules 298 * i.e. RFC 1885 2.4(e) 299 * Rule (e.1) is enforced by not using icmpv6_send 300 * in any code that processes icmp errors. 301 */ 302 addr_type = ipv6_addr_type(&hdr->daddr); 303 304 if (ipv6_chk_addr(&hdr->daddr, skb->dev, 0)) 305 saddr = &hdr->daddr; 306 307 /* 308 * Dest addr check 309 */ 310 311 if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 312 if (type != ICMPV6_PKT_TOOBIG && 313 !(type == ICMPV6_PARAMPROB && 314 code == ICMPV6_UNK_OPTION && 315 (opt_unrec(skb, info)))) 316 return; 317 318 saddr = NULL; 319 } 320 321 addr_type = ipv6_addr_type(&hdr->saddr); 322 323 /* 324 * Source addr check 325 */ 326 327 if (addr_type & IPV6_ADDR_LINKLOCAL) 328 iif = skb->dev->ifindex; 329 330 /* 331 * Must not send error if the source does not uniquely 332 * identify a single node (RFC2463 Section 2.4). 333 * We check unspecified / multicast addresses here, 334 * and anycast addresses will be checked later. 335 */ 336 if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 337 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 338 return; 339 } 340 341 /* 342 * Never answer to a ICMP packet. 343 */ 344 if (is_ineligible(skb)) { 345 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 346 return; 347 } 348 349 memset(&fl, 0, sizeof(fl)); 350 fl.proto = IPPROTO_ICMPV6; 351 ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 352 if (saddr) 353 ipv6_addr_copy(&fl.fl6_src, saddr); 354 fl.oif = iif; 355 fl.fl_icmp_type = type; 356 fl.fl_icmp_code = code; 357 358 if (icmpv6_xmit_lock()) 359 return; 360 361 sk = icmpv6_socket->sk; 362 np = inet6_sk(sk); 363 364 if (!icmpv6_xrlim_allow(sk, type, &fl)) 365 goto out; 366 367 tmp_hdr.icmp6_type = type; 368 tmp_hdr.icmp6_code = code; 369 tmp_hdr.icmp6_cksum = 0; 370 tmp_hdr.icmp6_pointer = htonl(info); 371 372 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 373 fl.oif = np->mcast_oif; 374 375 err = ip6_dst_lookup(sk, &dst, &fl); 376 if (err) 377 goto out; 378 379 /* 380 * We won't send icmp if the destination is known 381 * anycast. 382 */ 383 if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 384 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 385 goto out_dst_release; 386 } 387 388 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 389 goto out; 390 391 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 392 hlimit = np->mcast_hops; 393 else 394 hlimit = np->hop_limit; 395 if (hlimit < 0) 396 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 397 if (hlimit < 0) 398 hlimit = ipv6_get_hoplimit(dst->dev); 399 400 tclass = np->cork.tclass; 401 if (tclass < 0) 402 tclass = 0; 403 404 msg.skb = skb; 405 msg.offset = skb->nh.raw - skb->data; 406 407 len = skb->len - msg.offset; 408 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 409 if (len < 0) { 410 LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 411 goto out_dst_release; 412 } 413 414 idev = in6_dev_get(skb->dev); 415 416 err = ip6_append_data(sk, icmpv6_getfrag, &msg, 417 len + sizeof(struct icmp6hdr), 418 sizeof(struct icmp6hdr), 419 hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, 420 MSG_DONTWAIT); 421 if (err) { 422 ip6_flush_pending_frames(sk); 423 goto out_put; 424 } 425 err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 426 427 if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 428 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 429 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 430 431 out_put: 432 if (likely(idev != NULL)) 433 in6_dev_put(idev); 434 out_dst_release: 435 dst_release(dst); 436 out: 437 icmpv6_xmit_unlock(); 438 } 439 440 static void icmpv6_echo_reply(struct sk_buff *skb) 441 { 442 struct sock *sk; 443 struct inet6_dev *idev; 444 struct ipv6_pinfo *np; 445 struct in6_addr *saddr = NULL; 446 struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw; 447 struct icmp6hdr tmp_hdr; 448 struct flowi fl; 449 struct icmpv6_msg msg; 450 struct dst_entry *dst; 451 int err = 0; 452 int hlimit; 453 int tclass; 454 455 saddr = &skb->nh.ipv6h->daddr; 456 457 if (!ipv6_unicast_destination(skb)) 458 saddr = NULL; 459 460 memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 461 tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 462 463 memset(&fl, 0, sizeof(fl)); 464 fl.proto = IPPROTO_ICMPV6; 465 ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); 466 if (saddr) 467 ipv6_addr_copy(&fl.fl6_src, saddr); 468 fl.oif = skb->dev->ifindex; 469 fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 470 471 if (icmpv6_xmit_lock()) 472 return; 473 474 sk = icmpv6_socket->sk; 475 np = inet6_sk(sk); 476 477 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 478 fl.oif = np->mcast_oif; 479 480 err = ip6_dst_lookup(sk, &dst, &fl); 481 if (err) 482 goto out; 483 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 484 goto out; 485 486 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 487 hlimit = np->mcast_hops; 488 else 489 hlimit = np->hop_limit; 490 if (hlimit < 0) 491 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 492 if (hlimit < 0) 493 hlimit = ipv6_get_hoplimit(dst->dev); 494 495 tclass = np->cork.tclass; 496 if (tclass < 0) 497 tclass = 0; 498 499 idev = in6_dev_get(skb->dev); 500 501 msg.skb = skb; 502 msg.offset = 0; 503 504 err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 505 sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, 506 (struct rt6_info*)dst, MSG_DONTWAIT); 507 508 if (err) { 509 ip6_flush_pending_frames(sk); 510 goto out_put; 511 } 512 err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 513 514 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES); 515 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 516 517 out_put: 518 if (likely(idev != NULL)) 519 in6_dev_put(idev); 520 dst_release(dst); 521 out: 522 icmpv6_xmit_unlock(); 523 } 524 525 static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info) 526 { 527 struct in6_addr *saddr, *daddr; 528 struct inet6_protocol *ipprot; 529 struct sock *sk; 530 int inner_offset; 531 int hash; 532 u8 nexthdr; 533 534 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 535 return; 536 537 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 538 if (ipv6_ext_hdr(nexthdr)) { 539 /* now skip over extension headers */ 540 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 541 if (inner_offset<0) 542 return; 543 } else { 544 inner_offset = sizeof(struct ipv6hdr); 545 } 546 547 /* Checkin header including 8 bytes of inner protocol header. */ 548 if (!pskb_may_pull(skb, inner_offset+8)) 549 return; 550 551 saddr = &skb->nh.ipv6h->saddr; 552 daddr = &skb->nh.ipv6h->daddr; 553 554 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 555 Without this we will not able f.e. to make source routed 556 pmtu discovery. 557 Corresponding argument (opt) to notifiers is already added. 558 --ANK (980726) 559 */ 560 561 hash = nexthdr & (MAX_INET_PROTOS - 1); 562 563 rcu_read_lock(); 564 ipprot = rcu_dereference(inet6_protos[hash]); 565 if (ipprot && ipprot->err_handler) 566 ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 567 rcu_read_unlock(); 568 569 read_lock(&raw_v6_lock); 570 if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { 571 while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, 572 IP6CB(skb)->iif))) { 573 rawv6_err(sk, skb, NULL, type, code, inner_offset, info); 574 sk = sk_next(sk); 575 } 576 } 577 read_unlock(&raw_v6_lock); 578 } 579 580 /* 581 * Handle icmp messages 582 */ 583 584 static int icmpv6_rcv(struct sk_buff **pskb) 585 { 586 struct sk_buff *skb = *pskb; 587 struct net_device *dev = skb->dev; 588 struct inet6_dev *idev = __in6_dev_get(dev); 589 struct in6_addr *saddr, *daddr; 590 struct ipv6hdr *orig_hdr; 591 struct icmp6hdr *hdr; 592 int type; 593 594 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); 595 596 saddr = &skb->nh.ipv6h->saddr; 597 daddr = &skb->nh.ipv6h->daddr; 598 599 /* Perform checksum. */ 600 switch (skb->ip_summed) { 601 case CHECKSUM_HW: 602 if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 603 skb->csum)) 604 break; 605 /* fall through */ 606 case CHECKSUM_NONE: 607 skb->csum = ~csum_ipv6_magic(saddr, daddr, skb->len, 608 IPPROTO_ICMPV6, 0); 609 if (__skb_checksum_complete(skb)) { 610 LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", 611 NIP6(*saddr), NIP6(*daddr)); 612 goto discard_it; 613 } 614 } 615 616 if (!pskb_pull(skb, sizeof(struct icmp6hdr))) 617 goto discard_it; 618 619 hdr = (struct icmp6hdr *) skb->h.raw; 620 621 type = hdr->icmp6_type; 622 623 if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 624 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 625 else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT) 626 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST); 627 628 switch (type) { 629 case ICMPV6_ECHO_REQUEST: 630 icmpv6_echo_reply(skb); 631 break; 632 633 case ICMPV6_ECHO_REPLY: 634 /* we couldn't care less */ 635 break; 636 637 case ICMPV6_PKT_TOOBIG: 638 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 639 standard destination cache. Seems, only "advanced" 640 destination cache will allow to solve this problem 641 --ANK (980726) 642 */ 643 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 644 goto discard_it; 645 hdr = (struct icmp6hdr *) skb->h.raw; 646 orig_hdr = (struct ipv6hdr *) (hdr + 1); 647 rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 648 ntohl(hdr->icmp6_mtu)); 649 650 /* 651 * Drop through to notify 652 */ 653 654 case ICMPV6_DEST_UNREACH: 655 case ICMPV6_TIME_EXCEED: 656 case ICMPV6_PARAMPROB: 657 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 658 break; 659 660 case NDISC_ROUTER_SOLICITATION: 661 case NDISC_ROUTER_ADVERTISEMENT: 662 case NDISC_NEIGHBOUR_SOLICITATION: 663 case NDISC_NEIGHBOUR_ADVERTISEMENT: 664 case NDISC_REDIRECT: 665 ndisc_rcv(skb); 666 break; 667 668 case ICMPV6_MGM_QUERY: 669 igmp6_event_query(skb); 670 break; 671 672 case ICMPV6_MGM_REPORT: 673 igmp6_event_report(skb); 674 break; 675 676 case ICMPV6_MGM_REDUCTION: 677 case ICMPV6_NI_QUERY: 678 case ICMPV6_NI_REPLY: 679 case ICMPV6_MLD2_REPORT: 680 case ICMPV6_DHAAD_REQUEST: 681 case ICMPV6_DHAAD_REPLY: 682 case ICMPV6_MOBILE_PREFIX_SOL: 683 case ICMPV6_MOBILE_PREFIX_ADV: 684 break; 685 686 default: 687 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 688 689 /* informational */ 690 if (type & ICMPV6_INFOMSG_MASK) 691 break; 692 693 /* 694 * error of unknown type. 695 * must pass to upper level 696 */ 697 698 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 699 }; 700 kfree_skb(skb); 701 return 0; 702 703 discard_it: 704 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 705 kfree_skb(skb); 706 return 0; 707 } 708 709 int __init icmpv6_init(struct net_proto_family *ops) 710 { 711 struct sock *sk; 712 int err, i, j; 713 714 for_each_cpu(i) { 715 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, 716 &per_cpu(__icmpv6_socket, i)); 717 if (err < 0) { 718 printk(KERN_ERR 719 "Failed to initialize the ICMP6 control socket " 720 "(err %d).\n", 721 err); 722 goto fail; 723 } 724 725 sk = per_cpu(__icmpv6_socket, i)->sk; 726 sk->sk_allocation = GFP_ATOMIC; 727 728 /* Enough space for 2 64K ICMP packets, including 729 * sk_buff struct overhead. 730 */ 731 sk->sk_sndbuf = 732 (2 * ((64 * 1024) + sizeof(struct sk_buff))); 733 734 sk->sk_prot->unhash(sk); 735 } 736 737 738 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { 739 printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 740 err = -EAGAIN; 741 goto fail; 742 } 743 744 return 0; 745 746 fail: 747 for (j = 0; j < i; j++) { 748 if (!cpu_possible(j)) 749 continue; 750 sock_release(per_cpu(__icmpv6_socket, j)); 751 } 752 753 return err; 754 } 755 756 void icmpv6_cleanup(void) 757 { 758 int i; 759 760 for_each_cpu(i) { 761 sock_release(per_cpu(__icmpv6_socket, i)); 762 } 763 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 764 } 765 766 static const struct icmp6_err { 767 int err; 768 int fatal; 769 } tab_unreach[] = { 770 { /* NOROUTE */ 771 .err = ENETUNREACH, 772 .fatal = 0, 773 }, 774 { /* ADM_PROHIBITED */ 775 .err = EACCES, 776 .fatal = 1, 777 }, 778 { /* Was NOT_NEIGHBOUR, now reserved */ 779 .err = EHOSTUNREACH, 780 .fatal = 0, 781 }, 782 { /* ADDR_UNREACH */ 783 .err = EHOSTUNREACH, 784 .fatal = 0, 785 }, 786 { /* PORT_UNREACH */ 787 .err = ECONNREFUSED, 788 .fatal = 1, 789 }, 790 }; 791 792 int icmpv6_err_convert(int type, int code, int *err) 793 { 794 int fatal = 0; 795 796 *err = EPROTO; 797 798 switch (type) { 799 case ICMPV6_DEST_UNREACH: 800 fatal = 1; 801 if (code <= ICMPV6_PORT_UNREACH) { 802 *err = tab_unreach[code].err; 803 fatal = tab_unreach[code].fatal; 804 } 805 break; 806 807 case ICMPV6_PKT_TOOBIG: 808 *err = EMSGSIZE; 809 break; 810 811 case ICMPV6_PARAMPROB: 812 *err = EPROTO; 813 fatal = 1; 814 break; 815 816 case ICMPV6_TIME_EXCEED: 817 *err = EHOSTUNREACH; 818 break; 819 }; 820 821 return fatal; 822 } 823 824 #ifdef CONFIG_SYSCTL 825 ctl_table ipv6_icmp_table[] = { 826 { 827 .ctl_name = NET_IPV6_ICMP_RATELIMIT, 828 .procname = "ratelimit", 829 .data = &sysctl_icmpv6_time, 830 .maxlen = sizeof(int), 831 .mode = 0644, 832 .proc_handler = &proc_dointvec 833 }, 834 { .ctl_name = 0 }, 835 }; 836 #endif 837 838