1 /* 2 * RAW sockets for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/raw.c 9 * 10 * $Id: raw.c,v 1.51 2002/02/01 22:01:04 davem Exp $ 11 * 12 * Fixes: 13 * Hideaki YOSHIFUJI : sin6_scope_id support 14 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance) 15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16 * 17 * This program is free software; you can redistribute it and/or 18 * modify it under the terms of the GNU General Public License 19 * as published by the Free Software Foundation; either version 20 * 2 of the License, or (at your option) any later version. 21 */ 22 23 #include <linux/errno.h> 24 #include <linux/types.h> 25 #include <linux/socket.h> 26 #include <linux/sockios.h> 27 #include <linux/sched.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/icmpv6.h> 33 #include <linux/netfilter.h> 34 #include <linux/netfilter_ipv6.h> 35 #include <linux/skbuff.h> 36 #include <asm/uaccess.h> 37 #include <asm/ioctls.h> 38 #include <asm/bug.h> 39 40 #include <net/ip.h> 41 #include <net/sock.h> 42 #include <net/snmp.h> 43 44 #include <net/ipv6.h> 45 #include <net/ndisc.h> 46 #include <net/protocol.h> 47 #include <net/ip6_route.h> 48 #include <net/ip6_checksum.h> 49 #include <net/addrconf.h> 50 #include <net/transp_v6.h> 51 #include <net/udp.h> 52 #include <net/inet_common.h> 53 #include <net/tcp_states.h> 54 55 #include <net/rawv6.h> 56 #include <net/xfrm.h> 57 58 #include <linux/proc_fs.h> 59 #include <linux/seq_file.h> 60 61 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE]; 62 DEFINE_RWLOCK(raw_v6_lock); 63 64 static void raw_v6_hash(struct sock *sk) 65 { 66 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num & 67 (RAWV6_HTABLE_SIZE - 1)]; 68 69 write_lock_bh(&raw_v6_lock); 70 sk_add_node(sk, list); 71 sock_prot_inc_use(sk->sk_prot); 72 write_unlock_bh(&raw_v6_lock); 73 } 74 75 static void raw_v6_unhash(struct sock *sk) 76 { 77 write_lock_bh(&raw_v6_lock); 78 if (sk_del_node_init(sk)) 79 sock_prot_dec_use(sk->sk_prot); 80 write_unlock_bh(&raw_v6_lock); 81 } 82 83 84 /* Grumble... icmp and ip_input want to get at this... */ 85 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num, 86 struct in6_addr *loc_addr, struct in6_addr *rmt_addr, 87 int dif) 88 { 89 struct hlist_node *node; 90 int is_multicast = ipv6_addr_is_multicast(loc_addr); 91 92 sk_for_each_from(sk, node) 93 if (inet_sk(sk)->num == num) { 94 struct ipv6_pinfo *np = inet6_sk(sk); 95 96 if (!ipv6_addr_any(&np->daddr) && 97 !ipv6_addr_equal(&np->daddr, rmt_addr)) 98 continue; 99 100 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 101 continue; 102 103 if (!ipv6_addr_any(&np->rcv_saddr)) { 104 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 105 goto found; 106 if (is_multicast && 107 inet6_mc_check(sk, loc_addr, rmt_addr)) 108 goto found; 109 continue; 110 } 111 goto found; 112 } 113 sk = NULL; 114 found: 115 return sk; 116 } 117 118 /* 119 * 0 - deliver 120 * 1 - block 121 */ 122 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 123 { 124 struct icmp6hdr *icmph; 125 struct raw6_sock *rp = raw6_sk(sk); 126 127 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 128 __u32 *data = &rp->filter.data[0]; 129 int bit_nr; 130 131 icmph = (struct icmp6hdr *) skb->data; 132 bit_nr = icmph->icmp6_type; 133 134 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 135 } 136 return 0; 137 } 138 139 /* 140 * demultiplex raw sockets. 141 * (should consider queueing the skb in the sock receive_queue 142 * without calling rawv6.c) 143 * 144 * Caller owns SKB so we must make clones. 145 */ 146 int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 147 { 148 struct in6_addr *saddr; 149 struct in6_addr *daddr; 150 struct sock *sk; 151 int delivered = 0; 152 __u8 hash; 153 154 saddr = &skb->nh.ipv6h->saddr; 155 daddr = saddr + 1; 156 157 hash = nexthdr & (MAX_INET_PROTOS - 1); 158 159 read_lock(&raw_v6_lock); 160 sk = sk_head(&raw_v6_htable[hash]); 161 162 /* 163 * The first socket found will be delivered after 164 * delivery to transport protocols. 165 */ 166 167 if (sk == NULL) 168 goto out; 169 170 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 171 172 while (sk) { 173 delivered = 1; 174 if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) { 175 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 176 177 /* Not releasing hash table! */ 178 if (clone) { 179 nf_reset(clone); 180 rawv6_rcv(sk, clone); 181 } 182 } 183 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr, 184 IP6CB(skb)->iif); 185 } 186 out: 187 read_unlock(&raw_v6_lock); 188 return delivered; 189 } 190 191 /* This cleans up af_inet6 a bit. -DaveM */ 192 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 193 { 194 struct inet_sock *inet = inet_sk(sk); 195 struct ipv6_pinfo *np = inet6_sk(sk); 196 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 197 __u32 v4addr = 0; 198 int addr_type; 199 int err; 200 201 if (addr_len < SIN6_LEN_RFC2133) 202 return -EINVAL; 203 addr_type = ipv6_addr_type(&addr->sin6_addr); 204 205 /* Raw sockets are IPv6 only */ 206 if (addr_type == IPV6_ADDR_MAPPED) 207 return(-EADDRNOTAVAIL); 208 209 lock_sock(sk); 210 211 err = -EINVAL; 212 if (sk->sk_state != TCP_CLOSE) 213 goto out; 214 215 /* Check if the address belongs to the host. */ 216 if (addr_type != IPV6_ADDR_ANY) { 217 struct net_device *dev = NULL; 218 219 if (addr_type & IPV6_ADDR_LINKLOCAL) { 220 if (addr_len >= sizeof(struct sockaddr_in6) && 221 addr->sin6_scope_id) { 222 /* Override any existing binding, if another 223 * one is supplied by user. 224 */ 225 sk->sk_bound_dev_if = addr->sin6_scope_id; 226 } 227 228 /* Binding to link-local address requires an interface */ 229 if (!sk->sk_bound_dev_if) 230 goto out; 231 232 dev = dev_get_by_index(sk->sk_bound_dev_if); 233 if (!dev) { 234 err = -ENODEV; 235 goto out; 236 } 237 } 238 239 /* ipv4 addr of the socket is invalid. Only the 240 * unspecified and mapped address have a v4 equivalent. 241 */ 242 v4addr = LOOPBACK4_IPV6; 243 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 244 err = -EADDRNOTAVAIL; 245 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 246 if (dev) 247 dev_put(dev); 248 goto out; 249 } 250 } 251 if (dev) 252 dev_put(dev); 253 } 254 255 inet->rcv_saddr = inet->saddr = v4addr; 256 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 257 if (!(addr_type & IPV6_ADDR_MULTICAST)) 258 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 259 err = 0; 260 out: 261 release_sock(sk); 262 return err; 263 } 264 265 void rawv6_err(struct sock *sk, struct sk_buff *skb, 266 struct inet6_skb_parm *opt, 267 int type, int code, int offset, u32 info) 268 { 269 struct inet_sock *inet = inet_sk(sk); 270 struct ipv6_pinfo *np = inet6_sk(sk); 271 int err; 272 int harderr; 273 274 /* Report error on raw socket, if: 275 1. User requested recverr. 276 2. Socket is connected (otherwise the error indication 277 is useless without recverr and error is hard. 278 */ 279 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 280 return; 281 282 harderr = icmpv6_err_convert(type, code, &err); 283 if (type == ICMPV6_PKT_TOOBIG) 284 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 285 286 if (np->recverr) { 287 u8 *payload = skb->data; 288 if (!inet->hdrincl) 289 payload += offset; 290 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 291 } 292 293 if (np->recverr || harderr) { 294 sk->sk_err = err; 295 sk->sk_error_report(sk); 296 } 297 } 298 299 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 300 { 301 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 302 skb_checksum_complete(skb)) { 303 /* FIXME: increment a raw6 drops counter here */ 304 kfree_skb(skb); 305 return 0; 306 } 307 308 /* Charge it to the socket. */ 309 if (sock_queue_rcv_skb(sk,skb)<0) { 310 /* FIXME: increment a raw6 drops counter here */ 311 kfree_skb(skb); 312 return 0; 313 } 314 315 return 0; 316 } 317 318 /* 319 * This is next to useless... 320 * if we demultiplex in network layer we don't need the extra call 321 * just to queue the skb... 322 * maybe we could have the network decide upon a hint if it 323 * should call raw_rcv for demultiplexing 324 */ 325 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 326 { 327 struct inet_sock *inet = inet_sk(sk); 328 struct raw6_sock *rp = raw6_sk(sk); 329 330 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 331 kfree_skb(skb); 332 return NET_RX_DROP; 333 } 334 335 if (!rp->checksum) 336 skb->ip_summed = CHECKSUM_UNNECESSARY; 337 338 if (skb->ip_summed == CHECKSUM_HW) { 339 skb_postpull_rcsum(skb, skb->nh.raw, 340 skb->h.raw - skb->nh.raw); 341 if (!csum_ipv6_magic(&skb->nh.ipv6h->saddr, 342 &skb->nh.ipv6h->daddr, 343 skb->len, inet->num, skb->csum)) 344 skb->ip_summed = CHECKSUM_UNNECESSARY; 345 } 346 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 347 skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr, 348 &skb->nh.ipv6h->daddr, 349 skb->len, inet->num, 0); 350 351 if (inet->hdrincl) { 352 if (skb_checksum_complete(skb)) { 353 /* FIXME: increment a raw6 drops counter here */ 354 kfree_skb(skb); 355 return 0; 356 } 357 } 358 359 rawv6_rcv_skb(sk, skb); 360 return 0; 361 } 362 363 364 /* 365 * This should be easy, if there is something there 366 * we return it, otherwise we block. 367 */ 368 369 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 370 struct msghdr *msg, size_t len, 371 int noblock, int flags, int *addr_len) 372 { 373 struct ipv6_pinfo *np = inet6_sk(sk); 374 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 375 struct sk_buff *skb; 376 size_t copied; 377 int err; 378 379 if (flags & MSG_OOB) 380 return -EOPNOTSUPP; 381 382 if (addr_len) 383 *addr_len=sizeof(*sin6); 384 385 if (flags & MSG_ERRQUEUE) 386 return ipv6_recv_error(sk, msg, len); 387 388 skb = skb_recv_datagram(sk, flags, noblock, &err); 389 if (!skb) 390 goto out; 391 392 copied = skb->len; 393 if (copied > len) { 394 copied = len; 395 msg->msg_flags |= MSG_TRUNC; 396 } 397 398 if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 399 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 400 } else if (msg->msg_flags&MSG_TRUNC) { 401 if (__skb_checksum_complete(skb)) 402 goto csum_copy_err; 403 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 404 } else { 405 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 406 if (err == -EINVAL) 407 goto csum_copy_err; 408 } 409 if (err) 410 goto out_free; 411 412 /* Copy the address. */ 413 if (sin6) { 414 sin6->sin6_family = AF_INET6; 415 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 416 sin6->sin6_flowinfo = 0; 417 sin6->sin6_scope_id = 0; 418 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 419 sin6->sin6_scope_id = IP6CB(skb)->iif; 420 } 421 422 sock_recv_timestamp(msg, sk, skb); 423 424 if (np->rxopt.all) 425 datagram_recv_ctl(sk, msg, skb); 426 427 err = copied; 428 if (flags & MSG_TRUNC) 429 err = skb->len; 430 431 out_free: 432 skb_free_datagram(sk, skb); 433 out: 434 return err; 435 436 csum_copy_err: 437 skb_kill_datagram(sk, skb, flags); 438 439 /* Error for blocking case is chosen to masquerade 440 as some normal condition. 441 */ 442 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 443 /* FIXME: increment a raw6 drops counter here */ 444 goto out; 445 } 446 447 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 448 struct raw6_sock *rp) 449 { 450 struct sk_buff *skb; 451 int err = 0; 452 int offset; 453 int len; 454 int total_len; 455 u32 tmp_csum; 456 u16 csum; 457 458 if (!rp->checksum) 459 goto send; 460 461 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 462 goto out; 463 464 offset = rp->offset; 465 total_len = inet_sk(sk)->cork.length - (skb->nh.raw - skb->data); 466 if (offset >= total_len - 1) { 467 err = -EINVAL; 468 ip6_flush_pending_frames(sk); 469 goto out; 470 } 471 472 /* should be check HW csum miyazawa */ 473 if (skb_queue_len(&sk->sk_write_queue) == 1) { 474 /* 475 * Only one fragment on the socket. 476 */ 477 tmp_csum = skb->csum; 478 } else { 479 struct sk_buff *csum_skb = NULL; 480 tmp_csum = 0; 481 482 skb_queue_walk(&sk->sk_write_queue, skb) { 483 tmp_csum = csum_add(tmp_csum, skb->csum); 484 485 if (csum_skb) 486 continue; 487 488 len = skb->len - (skb->h.raw - skb->data); 489 if (offset >= len) { 490 offset -= len; 491 continue; 492 } 493 494 csum_skb = skb; 495 } 496 497 skb = csum_skb; 498 } 499 500 offset += skb->h.raw - skb->data; 501 if (skb_copy_bits(skb, offset, &csum, 2)) 502 BUG(); 503 504 /* in case cksum was not initialized */ 505 if (unlikely(csum)) 506 tmp_csum = csum_sub(tmp_csum, csum); 507 508 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 509 &fl->fl6_dst, 510 total_len, fl->proto, tmp_csum); 511 512 if (tmp_csum == 0) 513 tmp_csum = -1; 514 515 csum = tmp_csum; 516 if (skb_store_bits(skb, offset, &csum, 2)) 517 BUG(); 518 519 send: 520 err = ip6_push_pending_frames(sk); 521 out: 522 return err; 523 } 524 525 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 526 struct flowi *fl, struct rt6_info *rt, 527 unsigned int flags) 528 { 529 struct ipv6_pinfo *np = inet6_sk(sk); 530 struct ipv6hdr *iph; 531 struct sk_buff *skb; 532 unsigned int hh_len; 533 int err; 534 535 if (length > rt->u.dst.dev->mtu) { 536 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 537 return -EMSGSIZE; 538 } 539 if (flags&MSG_PROBE) 540 goto out; 541 542 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 543 544 skb = sock_alloc_send_skb(sk, length+hh_len+15, 545 flags&MSG_DONTWAIT, &err); 546 if (skb == NULL) 547 goto error; 548 skb_reserve(skb, hh_len); 549 550 skb->priority = sk->sk_priority; 551 skb->dst = dst_clone(&rt->u.dst); 552 553 skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length); 554 555 skb->ip_summed = CHECKSUM_NONE; 556 557 skb->h.raw = skb->nh.raw; 558 err = memcpy_fromiovecend((void *)iph, from, 0, length); 559 if (err) 560 goto error_fault; 561 562 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 563 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 564 dst_output); 565 if (err > 0) 566 err = np->recverr ? net_xmit_errno(err) : 0; 567 if (err) 568 goto error; 569 out: 570 return 0; 571 572 error_fault: 573 err = -EFAULT; 574 kfree_skb(skb); 575 error: 576 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 577 return err; 578 } 579 580 static void rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 581 { 582 struct iovec *iov; 583 u8 __user *type = NULL; 584 u8 __user *code = NULL; 585 int probed = 0; 586 int i; 587 588 if (!msg->msg_iov) 589 return; 590 591 for (i = 0; i < msg->msg_iovlen; i++) { 592 iov = &msg->msg_iov[i]; 593 if (!iov) 594 continue; 595 596 switch (fl->proto) { 597 case IPPROTO_ICMPV6: 598 /* check if one-byte field is readable or not. */ 599 if (iov->iov_base && iov->iov_len < 1) 600 break; 601 602 if (!type) { 603 type = iov->iov_base; 604 /* check if code field is readable or not. */ 605 if (iov->iov_len > 1) 606 code = type + 1; 607 } else if (!code) 608 code = iov->iov_base; 609 610 if (type && code) { 611 get_user(fl->fl_icmp_type, type); 612 get_user(fl->fl_icmp_code, code); 613 probed = 1; 614 } 615 break; 616 default: 617 probed = 1; 618 break; 619 } 620 if (probed) 621 break; 622 } 623 } 624 625 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 626 struct msghdr *msg, size_t len) 627 { 628 struct ipv6_txoptions opt_space; 629 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 630 struct in6_addr *daddr, *final_p = NULL, final; 631 struct inet_sock *inet = inet_sk(sk); 632 struct ipv6_pinfo *np = inet6_sk(sk); 633 struct raw6_sock *rp = raw6_sk(sk); 634 struct ipv6_txoptions *opt = NULL; 635 struct ip6_flowlabel *flowlabel = NULL; 636 struct dst_entry *dst = NULL; 637 struct flowi fl; 638 int addr_len = msg->msg_namelen; 639 int hlimit = -1; 640 int tclass = -1; 641 u16 proto; 642 int err; 643 644 /* Rough check on arithmetic overflow, 645 better check is made in ip6_build_xmit 646 */ 647 if (len < 0) 648 return -EMSGSIZE; 649 650 /* Mirror BSD error message compatibility */ 651 if (msg->msg_flags & MSG_OOB) 652 return -EOPNOTSUPP; 653 654 /* 655 * Get and verify the address. 656 */ 657 memset(&fl, 0, sizeof(fl)); 658 659 if (sin6) { 660 if (addr_len < SIN6_LEN_RFC2133) 661 return -EINVAL; 662 663 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 664 return(-EAFNOSUPPORT); 665 666 /* port is the proto value [0..255] carried in nexthdr */ 667 proto = ntohs(sin6->sin6_port); 668 669 if (!proto) 670 proto = inet->num; 671 else if (proto != inet->num) 672 return(-EINVAL); 673 674 if (proto > 255) 675 return(-EINVAL); 676 677 daddr = &sin6->sin6_addr; 678 if (np->sndflow) { 679 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 680 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 681 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 682 if (flowlabel == NULL) 683 return -EINVAL; 684 daddr = &flowlabel->dst; 685 } 686 } 687 688 /* 689 * Otherwise it will be difficult to maintain 690 * sk->sk_dst_cache. 691 */ 692 if (sk->sk_state == TCP_ESTABLISHED && 693 ipv6_addr_equal(daddr, &np->daddr)) 694 daddr = &np->daddr; 695 696 if (addr_len >= sizeof(struct sockaddr_in6) && 697 sin6->sin6_scope_id && 698 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 699 fl.oif = sin6->sin6_scope_id; 700 } else { 701 if (sk->sk_state != TCP_ESTABLISHED) 702 return -EDESTADDRREQ; 703 704 proto = inet->num; 705 daddr = &np->daddr; 706 fl.fl6_flowlabel = np->flow_label; 707 } 708 709 if (ipv6_addr_any(daddr)) { 710 /* 711 * unspecified destination address 712 * treated as error... is this correct ? 713 */ 714 fl6_sock_release(flowlabel); 715 return(-EINVAL); 716 } 717 718 if (fl.oif == 0) 719 fl.oif = sk->sk_bound_dev_if; 720 721 if (msg->msg_controllen) { 722 opt = &opt_space; 723 memset(opt, 0, sizeof(struct ipv6_txoptions)); 724 opt->tot_len = sizeof(struct ipv6_txoptions); 725 726 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass); 727 if (err < 0) { 728 fl6_sock_release(flowlabel); 729 return err; 730 } 731 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 732 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 733 if (flowlabel == NULL) 734 return -EINVAL; 735 } 736 if (!(opt->opt_nflen|opt->opt_flen)) 737 opt = NULL; 738 } 739 if (opt == NULL) 740 opt = np->opt; 741 if (flowlabel) 742 opt = fl6_merge_options(&opt_space, flowlabel, opt); 743 opt = ipv6_fixup_options(&opt_space, opt); 744 745 fl.proto = proto; 746 rawv6_probe_proto_opt(&fl, msg); 747 748 ipv6_addr_copy(&fl.fl6_dst, daddr); 749 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 750 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 751 752 /* merge ip6_build_xmit from ip6_output */ 753 if (opt && opt->srcrt) { 754 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 755 ipv6_addr_copy(&final, &fl.fl6_dst); 756 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 757 final_p = &final; 758 } 759 760 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 761 fl.oif = np->mcast_oif; 762 763 err = ip6_dst_lookup(sk, &dst, &fl); 764 if (err) 765 goto out; 766 if (final_p) 767 ipv6_addr_copy(&fl.fl6_dst, final_p); 768 769 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 770 goto out; 771 772 if (hlimit < 0) { 773 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 774 hlimit = np->mcast_hops; 775 else 776 hlimit = np->hop_limit; 777 if (hlimit < 0) 778 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 779 if (hlimit < 0) 780 hlimit = ipv6_get_hoplimit(dst->dev); 781 } 782 783 if (tclass < 0) { 784 tclass = np->cork.tclass; 785 if (tclass < 0) 786 tclass = 0; 787 } 788 789 if (msg->msg_flags&MSG_CONFIRM) 790 goto do_confirm; 791 792 back_from_confirm: 793 if (inet->hdrincl) { 794 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 795 } else { 796 lock_sock(sk); 797 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 798 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 799 msg->msg_flags); 800 801 if (err) 802 ip6_flush_pending_frames(sk); 803 else if (!(msg->msg_flags & MSG_MORE)) 804 err = rawv6_push_pending_frames(sk, &fl, rp); 805 } 806 done: 807 ip6_dst_store(sk, dst, 808 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 809 &np->daddr : NULL); 810 811 release_sock(sk); 812 out: 813 fl6_sock_release(flowlabel); 814 return err<0?err:len; 815 do_confirm: 816 dst_confirm(dst); 817 if (!(msg->msg_flags & MSG_PROBE) || len) 818 goto back_from_confirm; 819 err = 0; 820 goto done; 821 } 822 823 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 824 char __user *optval, int optlen) 825 { 826 switch (optname) { 827 case ICMPV6_FILTER: 828 if (optlen > sizeof(struct icmp6_filter)) 829 optlen = sizeof(struct icmp6_filter); 830 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 831 return -EFAULT; 832 return 0; 833 default: 834 return -ENOPROTOOPT; 835 }; 836 837 return 0; 838 } 839 840 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 841 char __user *optval, int __user *optlen) 842 { 843 int len; 844 845 switch (optname) { 846 case ICMPV6_FILTER: 847 if (get_user(len, optlen)) 848 return -EFAULT; 849 if (len < 0) 850 return -EINVAL; 851 if (len > sizeof(struct icmp6_filter)) 852 len = sizeof(struct icmp6_filter); 853 if (put_user(len, optlen)) 854 return -EFAULT; 855 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 856 return -EFAULT; 857 return 0; 858 default: 859 return -ENOPROTOOPT; 860 }; 861 862 return 0; 863 } 864 865 866 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 867 char __user *optval, int optlen) 868 { 869 struct raw6_sock *rp = raw6_sk(sk); 870 int val; 871 872 switch(level) { 873 case SOL_RAW: 874 break; 875 876 case SOL_ICMPV6: 877 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 878 return -EOPNOTSUPP; 879 return rawv6_seticmpfilter(sk, level, optname, optval, 880 optlen); 881 case SOL_IPV6: 882 if (optname == IPV6_CHECKSUM) 883 break; 884 default: 885 return ipv6_setsockopt(sk, level, optname, optval, 886 optlen); 887 }; 888 889 if (get_user(val, (int __user *)optval)) 890 return -EFAULT; 891 892 switch (optname) { 893 case IPV6_CHECKSUM: 894 /* You may get strange result with a positive odd offset; 895 RFC2292bis agrees with me. */ 896 if (val > 0 && (val&1)) 897 return(-EINVAL); 898 if (val < 0) { 899 rp->checksum = 0; 900 } else { 901 rp->checksum = 1; 902 rp->offset = val; 903 } 904 905 return 0; 906 break; 907 908 default: 909 return(-ENOPROTOOPT); 910 } 911 } 912 913 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 914 char __user *optval, int __user *optlen) 915 { 916 struct raw6_sock *rp = raw6_sk(sk); 917 int val, len; 918 919 switch(level) { 920 case SOL_RAW: 921 break; 922 923 case SOL_ICMPV6: 924 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 925 return -EOPNOTSUPP; 926 return rawv6_geticmpfilter(sk, level, optname, optval, 927 optlen); 928 case SOL_IPV6: 929 if (optname == IPV6_CHECKSUM) 930 break; 931 default: 932 return ipv6_getsockopt(sk, level, optname, optval, 933 optlen); 934 }; 935 936 if (get_user(len,optlen)) 937 return -EFAULT; 938 939 switch (optname) { 940 case IPV6_CHECKSUM: 941 if (rp->checksum == 0) 942 val = -1; 943 else 944 val = rp->offset; 945 break; 946 947 default: 948 return -ENOPROTOOPT; 949 } 950 951 len = min_t(unsigned int, sizeof(int), len); 952 953 if (put_user(len, optlen)) 954 return -EFAULT; 955 if (copy_to_user(optval,&val,len)) 956 return -EFAULT; 957 return 0; 958 } 959 960 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 961 { 962 switch(cmd) { 963 case SIOCOUTQ: 964 { 965 int amount = atomic_read(&sk->sk_wmem_alloc); 966 return put_user(amount, (int __user *)arg); 967 } 968 case SIOCINQ: 969 { 970 struct sk_buff *skb; 971 int amount = 0; 972 973 spin_lock_bh(&sk->sk_receive_queue.lock); 974 skb = skb_peek(&sk->sk_receive_queue); 975 if (skb != NULL) 976 amount = skb->tail - skb->h.raw; 977 spin_unlock_bh(&sk->sk_receive_queue.lock); 978 return put_user(amount, (int __user *)arg); 979 } 980 981 default: 982 return -ENOIOCTLCMD; 983 } 984 } 985 986 static void rawv6_close(struct sock *sk, long timeout) 987 { 988 if (inet_sk(sk)->num == IPPROTO_RAW) 989 ip6_ra_control(sk, -1, NULL); 990 991 sk_common_release(sk); 992 } 993 994 static int rawv6_init_sk(struct sock *sk) 995 { 996 if (inet_sk(sk)->num == IPPROTO_ICMPV6) { 997 struct raw6_sock *rp = raw6_sk(sk); 998 rp->checksum = 1; 999 rp->offset = 2; 1000 } 1001 return(0); 1002 } 1003 1004 struct proto rawv6_prot = { 1005 .name = "RAWv6", 1006 .owner = THIS_MODULE, 1007 .close = rawv6_close, 1008 .connect = ip6_datagram_connect, 1009 .disconnect = udp_disconnect, 1010 .ioctl = rawv6_ioctl, 1011 .init = rawv6_init_sk, 1012 .destroy = inet6_destroy_sock, 1013 .setsockopt = rawv6_setsockopt, 1014 .getsockopt = rawv6_getsockopt, 1015 .sendmsg = rawv6_sendmsg, 1016 .recvmsg = rawv6_recvmsg, 1017 .bind = rawv6_bind, 1018 .backlog_rcv = rawv6_rcv_skb, 1019 .hash = raw_v6_hash, 1020 .unhash = raw_v6_unhash, 1021 .obj_size = sizeof(struct raw6_sock), 1022 }; 1023 1024 #ifdef CONFIG_PROC_FS 1025 struct raw6_iter_state { 1026 int bucket; 1027 }; 1028 1029 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private) 1030 1031 static struct sock *raw6_get_first(struct seq_file *seq) 1032 { 1033 struct sock *sk; 1034 struct hlist_node *node; 1035 struct raw6_iter_state* state = raw6_seq_private(seq); 1036 1037 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket) 1038 sk_for_each(sk, node, &raw_v6_htable[state->bucket]) 1039 if (sk->sk_family == PF_INET6) 1040 goto out; 1041 sk = NULL; 1042 out: 1043 return sk; 1044 } 1045 1046 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk) 1047 { 1048 struct raw6_iter_state* state = raw6_seq_private(seq); 1049 1050 do { 1051 sk = sk_next(sk); 1052 try_again: 1053 ; 1054 } while (sk && sk->sk_family != PF_INET6); 1055 1056 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) { 1057 sk = sk_head(&raw_v6_htable[state->bucket]); 1058 goto try_again; 1059 } 1060 return sk; 1061 } 1062 1063 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos) 1064 { 1065 struct sock *sk = raw6_get_first(seq); 1066 if (sk) 1067 while (pos && (sk = raw6_get_next(seq, sk)) != NULL) 1068 --pos; 1069 return pos ? NULL : sk; 1070 } 1071 1072 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos) 1073 { 1074 read_lock(&raw_v6_lock); 1075 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1076 } 1077 1078 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1079 { 1080 struct sock *sk; 1081 1082 if (v == SEQ_START_TOKEN) 1083 sk = raw6_get_first(seq); 1084 else 1085 sk = raw6_get_next(seq, v); 1086 ++*pos; 1087 return sk; 1088 } 1089 1090 static void raw6_seq_stop(struct seq_file *seq, void *v) 1091 { 1092 read_unlock(&raw_v6_lock); 1093 } 1094 1095 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1096 { 1097 struct ipv6_pinfo *np = inet6_sk(sp); 1098 struct in6_addr *dest, *src; 1099 __u16 destp, srcp; 1100 1101 dest = &np->daddr; 1102 src = &np->rcv_saddr; 1103 destp = 0; 1104 srcp = inet_sk(sp)->num; 1105 seq_printf(seq, 1106 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1107 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1108 i, 1109 src->s6_addr32[0], src->s6_addr32[1], 1110 src->s6_addr32[2], src->s6_addr32[3], srcp, 1111 dest->s6_addr32[0], dest->s6_addr32[1], 1112 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1113 sp->sk_state, 1114 atomic_read(&sp->sk_wmem_alloc), 1115 atomic_read(&sp->sk_rmem_alloc), 1116 0, 0L, 0, 1117 sock_i_uid(sp), 0, 1118 sock_i_ino(sp), 1119 atomic_read(&sp->sk_refcnt), sp); 1120 } 1121 1122 static int raw6_seq_show(struct seq_file *seq, void *v) 1123 { 1124 if (v == SEQ_START_TOKEN) 1125 seq_printf(seq, 1126 " sl " 1127 "local_address " 1128 "remote_address " 1129 "st tx_queue rx_queue tr tm->when retrnsmt" 1130 " uid timeout inode\n"); 1131 else 1132 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket); 1133 return 0; 1134 } 1135 1136 static struct seq_operations raw6_seq_ops = { 1137 .start = raw6_seq_start, 1138 .next = raw6_seq_next, 1139 .stop = raw6_seq_stop, 1140 .show = raw6_seq_show, 1141 }; 1142 1143 static int raw6_seq_open(struct inode *inode, struct file *file) 1144 { 1145 struct seq_file *seq; 1146 int rc = -ENOMEM; 1147 struct raw6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 1148 if (!s) 1149 goto out; 1150 rc = seq_open(file, &raw6_seq_ops); 1151 if (rc) 1152 goto out_kfree; 1153 seq = file->private_data; 1154 seq->private = s; 1155 memset(s, 0, sizeof(*s)); 1156 out: 1157 return rc; 1158 out_kfree: 1159 kfree(s); 1160 goto out; 1161 } 1162 1163 static struct file_operations raw6_seq_fops = { 1164 .owner = THIS_MODULE, 1165 .open = raw6_seq_open, 1166 .read = seq_read, 1167 .llseek = seq_lseek, 1168 .release = seq_release_private, 1169 }; 1170 1171 int __init raw6_proc_init(void) 1172 { 1173 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops)) 1174 return -ENOMEM; 1175 return 0; 1176 } 1177 1178 void raw6_proc_exit(void) 1179 { 1180 proc_net_remove("raw6"); 1181 } 1182 #endif /* CONFIG_PROC_FS */ 1183