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); 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, len); 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 = icmpv6_socket->sk; 281 struct ipv6_pinfo *np = inet6_sk(sk); 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( 336 printk(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n")); 337 return; 338 } 339 340 /* 341 * Never answer to a ICMP packet. 342 */ 343 if (is_ineligible(skb)) { 344 LIMIT_NETDEBUG( 345 printk(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 if (!icmpv6_xrlim_allow(sk, type, &fl)) 362 goto out; 363 364 tmp_hdr.icmp6_type = type; 365 tmp_hdr.icmp6_code = code; 366 tmp_hdr.icmp6_cksum = 0; 367 tmp_hdr.icmp6_pointer = htonl(info); 368 369 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 370 fl.oif = np->mcast_oif; 371 372 err = ip6_dst_lookup(sk, &dst, &fl); 373 if (err) 374 goto out; 375 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 376 goto out_dst_release; 377 378 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 379 hlimit = np->mcast_hops; 380 else 381 hlimit = np->hop_limit; 382 if (hlimit < 0) 383 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 384 if (hlimit < 0) 385 hlimit = ipv6_get_hoplimit(dst->dev); 386 387 msg.skb = skb; 388 msg.offset = skb->nh.raw - skb->data; 389 390 len = skb->len - msg.offset; 391 len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 392 if (len < 0) { 393 LIMIT_NETDEBUG( 394 printk(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 = icmpv6_socket->sk; 427 struct inet6_dev *idev; 428 struct ipv6_pinfo *np = inet6_sk(sk); 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 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 458 fl.oif = np->mcast_oif; 459 460 err = ip6_dst_lookup(sk, &dst, &fl); 461 if (err) 462 goto out; 463 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 464 goto out_dst_release; 465 466 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 467 hlimit = np->mcast_hops; 468 else 469 hlimit = np->hop_limit; 470 if (hlimit < 0) 471 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 472 if (hlimit < 0) 473 hlimit = ipv6_get_hoplimit(dst->dev); 474 475 idev = in6_dev_get(skb->dev); 476 477 msg.skb = skb; 478 msg.offset = 0; 479 480 err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 481 sizeof(struct icmp6hdr), hlimit, NULL, &fl, 482 (struct rt6_info*)dst, MSG_DONTWAIT); 483 484 if (err) { 485 ip6_flush_pending_frames(sk); 486 goto out_put; 487 } 488 err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 489 490 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES); 491 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 492 493 out_put: 494 if (likely(idev != NULL)) 495 in6_dev_put(idev); 496 out_dst_release: 497 dst_release(dst); 498 out: 499 icmpv6_xmit_unlock(); 500 } 501 502 static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info) 503 { 504 struct in6_addr *saddr, *daddr; 505 struct inet6_protocol *ipprot; 506 struct sock *sk; 507 int inner_offset; 508 int hash; 509 u8 nexthdr; 510 511 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 512 return; 513 514 nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 515 if (ipv6_ext_hdr(nexthdr)) { 516 /* now skip over extension headers */ 517 inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, skb->len - sizeof(struct ipv6hdr)); 518 if (inner_offset<0) 519 return; 520 } else { 521 inner_offset = sizeof(struct ipv6hdr); 522 } 523 524 /* Checkin header including 8 bytes of inner protocol header. */ 525 if (!pskb_may_pull(skb, inner_offset+8)) 526 return; 527 528 saddr = &skb->nh.ipv6h->saddr; 529 daddr = &skb->nh.ipv6h->daddr; 530 531 /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 532 Without this we will not able f.e. to make source routed 533 pmtu discovery. 534 Corresponding argument (opt) to notifiers is already added. 535 --ANK (980726) 536 */ 537 538 hash = nexthdr & (MAX_INET_PROTOS - 1); 539 540 rcu_read_lock(); 541 ipprot = rcu_dereference(inet6_protos[hash]); 542 if (ipprot && ipprot->err_handler) 543 ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 544 rcu_read_unlock(); 545 546 read_lock(&raw_v6_lock); 547 if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { 548 while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr))) { 549 rawv6_err(sk, skb, NULL, type, code, inner_offset, info); 550 sk = sk_next(sk); 551 } 552 } 553 read_unlock(&raw_v6_lock); 554 } 555 556 /* 557 * Handle icmp messages 558 */ 559 560 static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) 561 { 562 struct sk_buff *skb = *pskb; 563 struct net_device *dev = skb->dev; 564 struct inet6_dev *idev = __in6_dev_get(dev); 565 struct in6_addr *saddr, *daddr; 566 struct ipv6hdr *orig_hdr; 567 struct icmp6hdr *hdr; 568 int type; 569 570 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); 571 572 saddr = &skb->nh.ipv6h->saddr; 573 daddr = &skb->nh.ipv6h->daddr; 574 575 /* Perform checksum. */ 576 if (skb->ip_summed == CHECKSUM_HW) { 577 skb->ip_summed = CHECKSUM_UNNECESSARY; 578 if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 579 skb->csum)) { 580 LIMIT_NETDEBUG( 581 printk(KERN_DEBUG "ICMPv6 hw checksum failed\n")); 582 skb->ip_summed = CHECKSUM_NONE; 583 } 584 } 585 if (skb->ip_summed == CHECKSUM_NONE) { 586 if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 587 skb_checksum(skb, 0, skb->len, 0))) { 588 LIMIT_NETDEBUG( 589 printk(KERN_DEBUG "ICMPv6 checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n", 590 NIP6(*saddr), NIP6(*daddr))); 591 goto discard_it; 592 } 593 } 594 595 if (!pskb_pull(skb, sizeof(struct icmp6hdr))) 596 goto discard_it; 597 598 hdr = (struct icmp6hdr *) skb->h.raw; 599 600 type = hdr->icmp6_type; 601 602 if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 603 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 604 else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT) 605 ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST); 606 607 switch (type) { 608 case ICMPV6_ECHO_REQUEST: 609 icmpv6_echo_reply(skb); 610 break; 611 612 case ICMPV6_ECHO_REPLY: 613 /* we couldn't care less */ 614 break; 615 616 case ICMPV6_PKT_TOOBIG: 617 /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 618 standard destination cache. Seems, only "advanced" 619 destination cache will allow to solve this problem 620 --ANK (980726) 621 */ 622 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 623 goto discard_it; 624 hdr = (struct icmp6hdr *) skb->h.raw; 625 orig_hdr = (struct ipv6hdr *) (hdr + 1); 626 rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 627 ntohl(hdr->icmp6_mtu)); 628 629 /* 630 * Drop through to notify 631 */ 632 633 case ICMPV6_DEST_UNREACH: 634 case ICMPV6_TIME_EXCEED: 635 case ICMPV6_PARAMPROB: 636 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 637 break; 638 639 case NDISC_ROUTER_SOLICITATION: 640 case NDISC_ROUTER_ADVERTISEMENT: 641 case NDISC_NEIGHBOUR_SOLICITATION: 642 case NDISC_NEIGHBOUR_ADVERTISEMENT: 643 case NDISC_REDIRECT: 644 ndisc_rcv(skb); 645 break; 646 647 case ICMPV6_MGM_QUERY: 648 igmp6_event_query(skb); 649 break; 650 651 case ICMPV6_MGM_REPORT: 652 igmp6_event_report(skb); 653 break; 654 655 case ICMPV6_MGM_REDUCTION: 656 case ICMPV6_NI_QUERY: 657 case ICMPV6_NI_REPLY: 658 case ICMPV6_MLD2_REPORT: 659 case ICMPV6_DHAAD_REQUEST: 660 case ICMPV6_DHAAD_REPLY: 661 case ICMPV6_MOBILE_PREFIX_SOL: 662 case ICMPV6_MOBILE_PREFIX_ADV: 663 break; 664 665 default: 666 LIMIT_NETDEBUG( 667 printk(KERN_DEBUG "icmpv6: msg of unknown type\n")); 668 669 /* informational */ 670 if (type & ICMPV6_INFOMSG_MASK) 671 break; 672 673 /* 674 * error of unknown type. 675 * must pass to upper level 676 */ 677 678 icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 679 }; 680 kfree_skb(skb); 681 return 0; 682 683 discard_it: 684 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 685 kfree_skb(skb); 686 return 0; 687 } 688 689 int __init icmpv6_init(struct net_proto_family *ops) 690 { 691 struct sock *sk; 692 int err, i, j; 693 694 for (i = 0; i < NR_CPUS; i++) { 695 if (!cpu_possible(i)) 696 continue; 697 698 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, 699 &per_cpu(__icmpv6_socket, i)); 700 if (err < 0) { 701 printk(KERN_ERR 702 "Failed to initialize the ICMP6 control socket " 703 "(err %d).\n", 704 err); 705 goto fail; 706 } 707 708 sk = per_cpu(__icmpv6_socket, i)->sk; 709 sk->sk_allocation = GFP_ATOMIC; 710 711 /* Enough space for 2 64K ICMP packets, including 712 * sk_buff struct overhead. 713 */ 714 sk->sk_sndbuf = 715 (2 * ((64 * 1024) + sizeof(struct sk_buff))); 716 717 sk->sk_prot->unhash(sk); 718 } 719 720 721 if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { 722 printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 723 err = -EAGAIN; 724 goto fail; 725 } 726 727 return 0; 728 729 fail: 730 for (j = 0; j < i; j++) { 731 if (!cpu_possible(j)) 732 continue; 733 sock_release(per_cpu(__icmpv6_socket, j)); 734 } 735 736 return err; 737 } 738 739 void icmpv6_cleanup(void) 740 { 741 int i; 742 743 for (i = 0; i < NR_CPUS; i++) { 744 if (!cpu_possible(i)) 745 continue; 746 sock_release(per_cpu(__icmpv6_socket, i)); 747 } 748 inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 749 } 750 751 static struct icmp6_err { 752 int err; 753 int fatal; 754 } tab_unreach[] = { 755 { /* NOROUTE */ 756 .err = ENETUNREACH, 757 .fatal = 0, 758 }, 759 { /* ADM_PROHIBITED */ 760 .err = EACCES, 761 .fatal = 1, 762 }, 763 { /* Was NOT_NEIGHBOUR, now reserved */ 764 .err = EHOSTUNREACH, 765 .fatal = 0, 766 }, 767 { /* ADDR_UNREACH */ 768 .err = EHOSTUNREACH, 769 .fatal = 0, 770 }, 771 { /* PORT_UNREACH */ 772 .err = ECONNREFUSED, 773 .fatal = 1, 774 }, 775 }; 776 777 int icmpv6_err_convert(int type, int code, int *err) 778 { 779 int fatal = 0; 780 781 *err = EPROTO; 782 783 switch (type) { 784 case ICMPV6_DEST_UNREACH: 785 fatal = 1; 786 if (code <= ICMPV6_PORT_UNREACH) { 787 *err = tab_unreach[code].err; 788 fatal = tab_unreach[code].fatal; 789 } 790 break; 791 792 case ICMPV6_PKT_TOOBIG: 793 *err = EMSGSIZE; 794 break; 795 796 case ICMPV6_PARAMPROB: 797 *err = EPROTO; 798 fatal = 1; 799 break; 800 801 case ICMPV6_TIME_EXCEED: 802 *err = EHOSTUNREACH; 803 break; 804 }; 805 806 return fatal; 807 } 808 809 #ifdef CONFIG_SYSCTL 810 ctl_table ipv6_icmp_table[] = { 811 { 812 .ctl_name = NET_IPV6_ICMP_RATELIMIT, 813 .procname = "ratelimit", 814 .data = &sysctl_icmpv6_time, 815 .maxlen = sizeof(int), 816 .mode = 0644, 817 .proc_handler = &proc_dointvec 818 }, 819 { .ctl_name = 0 }, 820 }; 821 #endif 822 823