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, unsigned int *nhoffp); 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; 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 if we know that source is Anycast also. 332 * for now we don't know that. 333 */ 334 if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 335 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 336 return; 337 } 338 339 /* 340 * Never answer to a ICMP packet. 341 */ 342 if (is_ineligible(skb)) { 343 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 344 return; 345 } 346 347 memset(&fl, 0, sizeof(fl)); 348 fl.proto = IPPROTO_ICMPV6; 349 ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 350 if (saddr) 351 ipv6_addr_copy(&fl.fl6_src, saddr); 352 fl.oif = iif; 353 fl.fl_icmp_type = type; 354 fl.fl_icmp_code = code; 355 356 if (icmpv6_xmit_lock()) 357 return; 358 359 sk = icmpv6_socket->sk; 360 np = inet6_sk(sk); 361 362 if (!icmpv6_xrlim_allow(sk, type, &fl)) 363 goto out; 364 365 tmp_hdr.icmp6_type = type; 366 tmp_hdr.icmp6_code = code; 367 tmp_hdr.icmp6_cksum = 0; 368 tmp_hdr.icmp6_pointer = htonl(info); 369 370 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 371 fl.oif = np->mcast_oif; 372 373 err = ip6_dst_lookup(sk, &dst, &fl); 374 if (err) 375 goto out; 376 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 377 goto out_dst_release; 378 379 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 380 hlimit = np->mcast_hops; 381 else 382 hlimit = np->hop_limit; 383 if (hlimit < 0) 384 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 385 if (hlimit < 0) 386 hlimit = ipv6_get_hoplimit(dst->dev); 387 388 msg.skb = skb; 389 msg.offset = skb->nh.raw - skb->data; 390 391 len = skb->len - msg.offset; 392 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 393 if (len < 0) { 394 LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 395 goto out_dst_release; 396 } 397 398 idev = in6_dev_get(skb->dev); 399 400 err = ip6_append_data(sk, icmpv6_getfrag, &msg, 401 len + sizeof(struct icmp6hdr), 402 sizeof(struct icmp6hdr), 403 hlimit, NULL, &fl, (struct rt6_info*)dst, 404 MSG_DONTWAIT); 405 if (err) { 406 ip6_flush_pending_frames(sk); 407 goto out_put; 408 } 409 err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 410 411 if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 412 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 413 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 414 415 out_put: 416 if (likely(idev != NULL)) 417 in6_dev_put(idev); 418 out_dst_release: 419 dst_release(dst); 420 out: 421 icmpv6_xmit_unlock(); 422 } 423 424 static void icmpv6_echo_reply(struct sk_buff *skb) 425 { 426 struct sock *sk; 427 struct inet6_dev *idev; 428 struct ipv6_pinfo *np; 429 struct in6_addr *saddr = NULL; 430 struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw; 431 struct icmp6hdr tmp_hdr; 432 struct flowi fl; 433 struct icmpv6_msg msg; 434 struct dst_entry *dst; 435 int err = 0; 436 int hlimit; 437 438 saddr = &skb->nh.ipv6h->daddr; 439 440 if (!ipv6_unicast_destination(skb)) 441 saddr = NULL; 442 443 memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 444 tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 445 446 memset(&fl, 0, sizeof(fl)); 447 fl.proto = IPPROTO_ICMPV6; 448 ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); 449 if (saddr) 450 ipv6_addr_copy(&fl.fl6_src, saddr); 451 fl.oif = skb->dev->ifindex; 452 fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 453 454 if (icmpv6_xmit_lock()) 455 return; 456 457 sk = icmpv6_socket->sk; 458 np = inet6_sk(sk); 459 460 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 461 fl.oif = np->mcast_oif; 462 463 err = ip6_dst_lookup(sk, &dst, &fl); 464 if (err) 465 goto out; 466 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 467 goto out_dst_release; 468 469 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 470 hlimit = np->mcast_hops; 471 else 472 hlimit = np->hop_limit; 473 if (hlimit < 0) 474 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 475 if (hlimit < 0) 476 hlimit = ipv6_get_hoplimit(dst->dev); 477 478 idev = in6_dev_get(skb->dev); 479 480 msg.skb = skb; 481 msg.offset = 0; 482 483 err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 484 sizeof(struct icmp6hdr), hlimit, NULL, &fl, 485 (struct rt6_info*)dst, MSG_DONTWAIT); 486 487 if (err) { 488 ip6_flush_pending_frames(sk); 489 goto out_put; 490 } 491 err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 492 493 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES); 494 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 495 496 out_put: 497 if (likely(idev != NULL)) 498 in6_dev_put(idev); 499 out_dst_release: 500 dst_release(dst); 501 out: 502 icmpv6_xmit_unlock(); 503 } 504 505 static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info) 506 { 507 struct in6_addr *saddr, *daddr; 508 struct inet6_protocol *ipprot; 509 struct sock *sk; 510 int inner_offset; 511 int hash; 512 u8 nexthdr; 513 514 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 515 return; 516 517 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 518 if (ipv6_ext_hdr(nexthdr)) { 519 /* now skip over extension headers */ 520 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 521 if (inner_offset<0) 522 return; 523 } else { 524 inner_offset = sizeof(struct ipv6hdr); 525 } 526 527 /* Checkin header including 8 bytes of inner protocol header. */ 528 if (!pskb_may_pull(skb, inner_offset+8)) 529 return; 530 531 saddr = &skb->nh.ipv6h->saddr; 532 daddr = &skb->nh.ipv6h->daddr; 533 534 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 535 Without this we will not able f.e. to make source routed 536 pmtu discovery. 537 Corresponding argument (opt) to notifiers is already added. 538 --ANK (980726) 539 */ 540 541 hash = nexthdr & (MAX_INET_PROTOS - 1); 542 543 rcu_read_lock(); 544 ipprot = rcu_dereference(inet6_protos[hash]); 545 if (ipprot && ipprot->err_handler) 546 ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 547 rcu_read_unlock(); 548 549 read_lock(&raw_v6_lock); 550 if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { 551 while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, 552 IP6CB(skb)->iif))) { 553 rawv6_err(sk, skb, NULL, type, code, inner_offset, info); 554 sk = sk_next(sk); 555 } 556 } 557 read_unlock(&raw_v6_lock); 558 } 559 560 /* 561 * Handle icmp messages 562 */ 563 564 static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) 565 { 566 struct sk_buff *skb = *pskb; 567 struct net_device *dev = skb->dev; 568 struct inet6_dev *idev = __in6_dev_get(dev); 569 struct in6_addr *saddr, *daddr; 570 struct ipv6hdr *orig_hdr; 571 struct icmp6hdr *hdr; 572 int type; 573 574 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); 575 576 saddr = &skb->nh.ipv6h->saddr; 577 daddr = &skb->nh.ipv6h->daddr; 578 579 /* Perform checksum. */ 580 if (skb->ip_summed == CHECKSUM_HW) { 581 skb->ip_summed = CHECKSUM_UNNECESSARY; 582 if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 583 skb->csum)) { 584 LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 hw checksum failed\n"); 585 skb->ip_summed = CHECKSUM_NONE; 586 } 587 } 588 if (skb->ip_summed == CHECKSUM_NONE) { 589 if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 590 skb_checksum(skb, 0, skb->len, 0))) { 591 LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n", 592 NIP6(*saddr), NIP6(*daddr)); 593 goto discard_it; 594 } 595 } 596 597 if (!pskb_pull(skb, sizeof(struct icmp6hdr))) 598 goto discard_it; 599 600 hdr = (struct icmp6hdr *) skb->h.raw; 601 602 type = hdr->icmp6_type; 603 604 if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 605 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 606 else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT) 607 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST); 608 609 switch (type) { 610 case ICMPV6_ECHO_REQUEST: 611 icmpv6_echo_reply(skb); 612 break; 613 614 case ICMPV6_ECHO_REPLY: 615 /* we couldn't care less */ 616 break; 617 618 case ICMPV6_PKT_TOOBIG: 619 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 620 standard destination cache. Seems, only "advanced" 621 destination cache will allow to solve this problem 622 --ANK (980726) 623 */ 624 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 625 goto discard_it; 626 hdr = (struct icmp6hdr *) skb->h.raw; 627 orig_hdr = (struct ipv6hdr *) (hdr + 1); 628 rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 629 ntohl(hdr->icmp6_mtu)); 630 631 /* 632 * Drop through to notify 633 */ 634 635 case ICMPV6_DEST_UNREACH: 636 case ICMPV6_TIME_EXCEED: 637 case ICMPV6_PARAMPROB: 638 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 639 break; 640 641 case NDISC_ROUTER_SOLICITATION: 642 case NDISC_ROUTER_ADVERTISEMENT: 643 case NDISC_NEIGHBOUR_SOLICITATION: 644 case NDISC_NEIGHBOUR_ADVERTISEMENT: 645 case NDISC_REDIRECT: 646 ndisc_rcv(skb); 647 break; 648 649 case ICMPV6_MGM_QUERY: 650 igmp6_event_query(skb); 651 break; 652 653 case ICMPV6_MGM_REPORT: 654 igmp6_event_report(skb); 655 break; 656 657 case ICMPV6_MGM_REDUCTION: 658 case ICMPV6_NI_QUERY: 659 case ICMPV6_NI_REPLY: 660 case ICMPV6_MLD2_REPORT: 661 case ICMPV6_DHAAD_REQUEST: 662 case ICMPV6_DHAAD_REPLY: 663 case ICMPV6_MOBILE_PREFIX_SOL: 664 case ICMPV6_MOBILE_PREFIX_ADV: 665 break; 666 667 default: 668 LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 669 670 /* informational */ 671 if (type & ICMPV6_INFOMSG_MASK) 672 break; 673 674 /* 675 * error of unknown type. 676 * must pass to upper level 677 */ 678 679 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 680 }; 681 kfree_skb(skb); 682 return 0; 683 684 discard_it: 685 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 686 kfree_skb(skb); 687 return 0; 688 } 689 690 int __init icmpv6_init(struct net_proto_family *ops) 691 { 692 struct sock *sk; 693 int err, i, j; 694 695 for (i = 0; i < NR_CPUS; i++) { 696 if (!cpu_possible(i)) 697 continue; 698 699 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, 700 &per_cpu(__icmpv6_socket, i)); 701 if (err < 0) { 702 printk(KERN_ERR 703 "Failed to initialize the ICMP6 control socket " 704 "(err %d).\n", 705 err); 706 goto fail; 707 } 708 709 sk = per_cpu(__icmpv6_socket, i)->sk; 710 sk->sk_allocation = GFP_ATOMIC; 711 712 /* Enough space for 2 64K ICMP packets, including 713 * sk_buff struct overhead. 714 */ 715 sk->sk_sndbuf = 716 (2 * ((64 * 1024) + sizeof(struct sk_buff))); 717 718 sk->sk_prot->unhash(sk); 719 } 720 721 722 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { 723 printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 724 err = -EAGAIN; 725 goto fail; 726 } 727 728 return 0; 729 730 fail: 731 for (j = 0; j < i; j++) { 732 if (!cpu_possible(j)) 733 continue; 734 sock_release(per_cpu(__icmpv6_socket, j)); 735 } 736 737 return err; 738 } 739 740 void icmpv6_cleanup(void) 741 { 742 int i; 743 744 for (i = 0; i < NR_CPUS; i++) { 745 if (!cpu_possible(i)) 746 continue; 747 sock_release(per_cpu(__icmpv6_socket, i)); 748 } 749 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 750 } 751 752 static struct icmp6_err { 753 int err; 754 int fatal; 755 } tab_unreach[] = { 756 { /* NOROUTE */ 757 .err = ENETUNREACH, 758 .fatal = 0, 759 }, 760 { /* ADM_PROHIBITED */ 761 .err = EACCES, 762 .fatal = 1, 763 }, 764 { /* Was NOT_NEIGHBOUR, now reserved */ 765 .err = EHOSTUNREACH, 766 .fatal = 0, 767 }, 768 { /* ADDR_UNREACH */ 769 .err = EHOSTUNREACH, 770 .fatal = 0, 771 }, 772 { /* PORT_UNREACH */ 773 .err = ECONNREFUSED, 774 .fatal = 1, 775 }, 776 }; 777 778 int icmpv6_err_convert(int type, int code, int *err) 779 { 780 int fatal = 0; 781 782 *err = EPROTO; 783 784 switch (type) { 785 case ICMPV6_DEST_UNREACH: 786 fatal = 1; 787 if (code <= ICMPV6_PORT_UNREACH) { 788 *err = tab_unreach[code].err; 789 fatal = tab_unreach[code].fatal; 790 } 791 break; 792 793 case ICMPV6_PKT_TOOBIG: 794 *err = EMSGSIZE; 795 break; 796 797 case ICMPV6_PARAMPROB: 798 *err = EPROTO; 799 fatal = 1; 800 break; 801 802 case ICMPV6_TIME_EXCEED: 803 *err = EHOSTUNREACH; 804 break; 805 }; 806 807 return fatal; 808 } 809 810 #ifdef CONFIG_SYSCTL 811 ctl_table ipv6_icmp_table[] = { 812 { 813 .ctl_name = NET_IPV6_ICMP_RATELIMIT, 814 .procname = "ratelimit", 815 .data = &sysctl_icmpv6_time, 816 .maxlen = sizeof(int), 817 .mode = 0644, 818 .proc_handler = &proc_dointvec 819 }, 820 { .ctl_name = 0 }, 821 }; 822 #endif 823 824