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 <asm/uaccess.h> 36 #include <asm/ioctls.h> 37 #include <asm/bug.h> 38 39 #include <net/ip.h> 40 #include <net/sock.h> 41 #include <net/snmp.h> 42 43 #include <net/ipv6.h> 44 #include <net/ndisc.h> 45 #include <net/protocol.h> 46 #include <net/ip6_route.h> 47 #include <net/ip6_checksum.h> 48 #include <net/addrconf.h> 49 #include <net/transp_v6.h> 50 #include <net/udp.h> 51 #include <net/inet_common.h> 52 #include <net/tcp_states.h> 53 54 #include <net/rawv6.h> 55 #include <net/xfrm.h> 56 57 #include <linux/proc_fs.h> 58 #include <linux/seq_file.h> 59 60 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE]; 61 DEFINE_RWLOCK(raw_v6_lock); 62 63 static void raw_v6_hash(struct sock *sk) 64 { 65 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num & 66 (RAWV6_HTABLE_SIZE - 1)]; 67 68 write_lock_bh(&raw_v6_lock); 69 sk_add_node(sk, list); 70 sock_prot_inc_use(sk->sk_prot); 71 write_unlock_bh(&raw_v6_lock); 72 } 73 74 static void raw_v6_unhash(struct sock *sk) 75 { 76 write_lock_bh(&raw_v6_lock); 77 if (sk_del_node_init(sk)) 78 sock_prot_dec_use(sk->sk_prot); 79 write_unlock_bh(&raw_v6_lock); 80 } 81 82 83 /* Grumble... icmp and ip_input want to get at this... */ 84 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num, 85 struct in6_addr *loc_addr, struct in6_addr *rmt_addr, 86 int dif) 87 { 88 struct hlist_node *node; 89 int is_multicast = ipv6_addr_is_multicast(loc_addr); 90 91 sk_for_each_from(sk, node) 92 if (inet_sk(sk)->num == num) { 93 struct ipv6_pinfo *np = inet6_sk(sk); 94 95 if (!ipv6_addr_any(&np->daddr) && 96 !ipv6_addr_equal(&np->daddr, rmt_addr)) 97 continue; 98 99 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 100 continue; 101 102 if (!ipv6_addr_any(&np->rcv_saddr)) { 103 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 104 goto found; 105 if (is_multicast && 106 inet6_mc_check(sk, loc_addr, rmt_addr)) 107 goto found; 108 continue; 109 } 110 goto found; 111 } 112 sk = NULL; 113 found: 114 return sk; 115 } 116 117 /* 118 * 0 - deliver 119 * 1 - block 120 */ 121 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 122 { 123 struct icmp6hdr *icmph; 124 struct raw6_sock *rp = raw6_sk(sk); 125 126 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 127 __u32 *data = &rp->filter.data[0]; 128 int bit_nr; 129 130 icmph = (struct icmp6hdr *) skb->data; 131 bit_nr = icmph->icmp6_type; 132 133 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 134 } 135 return 0; 136 } 137 138 /* 139 * demultiplex raw sockets. 140 * (should consider queueing the skb in the sock receive_queue 141 * without calling rawv6.c) 142 * 143 * Caller owns SKB so we must make clones. 144 */ 145 int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 146 { 147 struct in6_addr *saddr; 148 struct in6_addr *daddr; 149 struct sock *sk; 150 int delivered = 0; 151 __u8 hash; 152 153 saddr = &skb->nh.ipv6h->saddr; 154 daddr = saddr + 1; 155 156 hash = nexthdr & (MAX_INET_PROTOS - 1); 157 158 read_lock(&raw_v6_lock); 159 sk = sk_head(&raw_v6_htable[hash]); 160 161 /* 162 * The first socket found will be delivered after 163 * delivery to transport protocols. 164 */ 165 166 if (sk == NULL) 167 goto out; 168 169 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, skb->dev->ifindex); 170 171 while (sk) { 172 delivered = 1; 173 if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) { 174 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 175 176 /* Not releasing hash table! */ 177 if (clone) 178 rawv6_rcv(sk, clone); 179 } 180 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr, 181 skb->dev->ifindex); 182 } 183 out: 184 read_unlock(&raw_v6_lock); 185 return delivered; 186 } 187 188 /* This cleans up af_inet6 a bit. -DaveM */ 189 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 190 { 191 struct inet_sock *inet = inet_sk(sk); 192 struct ipv6_pinfo *np = inet6_sk(sk); 193 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 194 __u32 v4addr = 0; 195 int addr_type; 196 int err; 197 198 if (addr_len < SIN6_LEN_RFC2133) 199 return -EINVAL; 200 addr_type = ipv6_addr_type(&addr->sin6_addr); 201 202 /* Raw sockets are IPv6 only */ 203 if (addr_type == IPV6_ADDR_MAPPED) 204 return(-EADDRNOTAVAIL); 205 206 lock_sock(sk); 207 208 err = -EINVAL; 209 if (sk->sk_state != TCP_CLOSE) 210 goto out; 211 212 /* Check if the address belongs to the host. */ 213 if (addr_type != IPV6_ADDR_ANY) { 214 struct net_device *dev = NULL; 215 216 if (addr_type & IPV6_ADDR_LINKLOCAL) { 217 if (addr_len >= sizeof(struct sockaddr_in6) && 218 addr->sin6_scope_id) { 219 /* Override any existing binding, if another 220 * one is supplied by user. 221 */ 222 sk->sk_bound_dev_if = addr->sin6_scope_id; 223 } 224 225 /* Binding to link-local address requires an interface */ 226 if (!sk->sk_bound_dev_if) 227 goto out; 228 229 dev = dev_get_by_index(sk->sk_bound_dev_if); 230 if (!dev) { 231 err = -ENODEV; 232 goto out; 233 } 234 } 235 236 /* ipv4 addr of the socket is invalid. Only the 237 * unspecified and mapped address have a v4 equivalent. 238 */ 239 v4addr = LOOPBACK4_IPV6; 240 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 241 err = -EADDRNOTAVAIL; 242 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 243 if (dev) 244 dev_put(dev); 245 goto out; 246 } 247 } 248 if (dev) 249 dev_put(dev); 250 } 251 252 inet->rcv_saddr = inet->saddr = v4addr; 253 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 254 if (!(addr_type & IPV6_ADDR_MULTICAST)) 255 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 256 err = 0; 257 out: 258 release_sock(sk); 259 return err; 260 } 261 262 void rawv6_err(struct sock *sk, struct sk_buff *skb, 263 struct inet6_skb_parm *opt, 264 int type, int code, int offset, u32 info) 265 { 266 struct inet_sock *inet = inet_sk(sk); 267 struct ipv6_pinfo *np = inet6_sk(sk); 268 int err; 269 int harderr; 270 271 /* Report error on raw socket, if: 272 1. User requested recverr. 273 2. Socket is connected (otherwise the error indication 274 is useless without recverr and error is hard. 275 */ 276 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 277 return; 278 279 harderr = icmpv6_err_convert(type, code, &err); 280 if (type == ICMPV6_PKT_TOOBIG) 281 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 282 283 if (np->recverr) { 284 u8 *payload = skb->data; 285 if (!inet->hdrincl) 286 payload += offset; 287 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 288 } 289 290 if (np->recverr || harderr) { 291 sk->sk_err = err; 292 sk->sk_error_report(sk); 293 } 294 } 295 296 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 297 { 298 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 299 skb->ip_summed != CHECKSUM_UNNECESSARY) { 300 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { 301 /* FIXME: increment a raw6 drops counter here */ 302 kfree_skb(skb); 303 return 0; 304 } 305 skb->ip_summed = CHECKSUM_UNNECESSARY; 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_UNNECESSARY) { 339 if (skb->ip_summed == CHECKSUM_HW) { 340 skb_postpull_rcsum(skb, skb->nh.raw, 341 skb->h.raw - skb->nh.raw); 342 skb->ip_summed = CHECKSUM_UNNECESSARY; 343 if (csum_ipv6_magic(&skb->nh.ipv6h->saddr, 344 &skb->nh.ipv6h->daddr, 345 skb->len, inet->num, skb->csum)) { 346 LIMIT_NETDEBUG(KERN_DEBUG "raw v6 hw csum failure.\n"); 347 skb->ip_summed = CHECKSUM_NONE; 348 } 349 } 350 if (skb->ip_summed == CHECKSUM_NONE) 351 skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr, 352 &skb->nh.ipv6h->daddr, 353 skb->len, inet->num, 0); 354 } 355 356 if (inet->hdrincl) { 357 if (skb->ip_summed != CHECKSUM_UNNECESSARY && 358 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { 359 /* FIXME: increment a raw6 drops counter here */ 360 kfree_skb(skb); 361 return 0; 362 } 363 skb->ip_summed = CHECKSUM_UNNECESSARY; 364 } 365 366 rawv6_rcv_skb(sk, skb); 367 return 0; 368 } 369 370 371 /* 372 * This should be easy, if there is something there 373 * we return it, otherwise we block. 374 */ 375 376 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 377 struct msghdr *msg, size_t len, 378 int noblock, int flags, int *addr_len) 379 { 380 struct ipv6_pinfo *np = inet6_sk(sk); 381 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 382 struct sk_buff *skb; 383 size_t copied; 384 int err; 385 386 if (flags & MSG_OOB) 387 return -EOPNOTSUPP; 388 389 if (addr_len) 390 *addr_len=sizeof(*sin6); 391 392 if (flags & MSG_ERRQUEUE) 393 return ipv6_recv_error(sk, msg, len); 394 395 skb = skb_recv_datagram(sk, flags, noblock, &err); 396 if (!skb) 397 goto out; 398 399 copied = skb->len; 400 if (copied > len) { 401 copied = len; 402 msg->msg_flags |= MSG_TRUNC; 403 } 404 405 if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 406 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 407 } else if (msg->msg_flags&MSG_TRUNC) { 408 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) 409 goto csum_copy_err; 410 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 411 } else { 412 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 413 if (err == -EINVAL) 414 goto csum_copy_err; 415 } 416 if (err) 417 goto out_free; 418 419 /* Copy the address. */ 420 if (sin6) { 421 sin6->sin6_family = AF_INET6; 422 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 423 sin6->sin6_flowinfo = 0; 424 sin6->sin6_scope_id = 0; 425 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 426 sin6->sin6_scope_id = IP6CB(skb)->iif; 427 } 428 429 sock_recv_timestamp(msg, sk, skb); 430 431 if (np->rxopt.all) 432 datagram_recv_ctl(sk, msg, skb); 433 434 err = copied; 435 if (flags & MSG_TRUNC) 436 err = skb->len; 437 438 out_free: 439 skb_free_datagram(sk, skb); 440 out: 441 return err; 442 443 csum_copy_err: 444 /* Clear queue. */ 445 if (flags&MSG_PEEK) { 446 int clear = 0; 447 spin_lock_bh(&sk->sk_receive_queue.lock); 448 if (skb == skb_peek(&sk->sk_receive_queue)) { 449 __skb_unlink(skb, &sk->sk_receive_queue); 450 clear = 1; 451 } 452 spin_unlock_bh(&sk->sk_receive_queue.lock); 453 if (clear) 454 kfree_skb(skb); 455 } 456 457 /* Error for blocking case is chosen to masquerade 458 as some normal condition. 459 */ 460 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 461 /* FIXME: increment a raw6 drops counter here */ 462 goto out_free; 463 } 464 465 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 466 struct raw6_sock *rp) 467 { 468 struct sk_buff *skb; 469 int err = 0; 470 int offset; 471 int len; 472 int total_len; 473 u32 tmp_csum; 474 u16 csum; 475 476 if (!rp->checksum) 477 goto send; 478 479 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 480 goto out; 481 482 offset = rp->offset; 483 total_len = inet_sk(sk)->cork.length - (skb->nh.raw - skb->data); 484 if (offset >= total_len - 1) { 485 err = -EINVAL; 486 ip6_flush_pending_frames(sk); 487 goto out; 488 } 489 490 /* should be check HW csum miyazawa */ 491 if (skb_queue_len(&sk->sk_write_queue) == 1) { 492 /* 493 * Only one fragment on the socket. 494 */ 495 tmp_csum = skb->csum; 496 } else { 497 struct sk_buff *csum_skb = NULL; 498 tmp_csum = 0; 499 500 skb_queue_walk(&sk->sk_write_queue, skb) { 501 tmp_csum = csum_add(tmp_csum, skb->csum); 502 503 if (csum_skb) 504 continue; 505 506 len = skb->len - (skb->h.raw - skb->data); 507 if (offset >= len) { 508 offset -= len; 509 continue; 510 } 511 512 csum_skb = skb; 513 } 514 515 skb = csum_skb; 516 } 517 518 offset += skb->h.raw - skb->data; 519 if (skb_copy_bits(skb, offset, &csum, 2)) 520 BUG(); 521 522 /* in case cksum was not initialized */ 523 if (unlikely(csum)) 524 tmp_csum = csum_sub(tmp_csum, csum); 525 526 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 527 &fl->fl6_dst, 528 total_len, fl->proto, tmp_csum); 529 530 if (tmp_csum == 0) 531 tmp_csum = -1; 532 533 csum = tmp_csum; 534 if (skb_store_bits(skb, offset, &csum, 2)) 535 BUG(); 536 537 send: 538 err = ip6_push_pending_frames(sk); 539 out: 540 return err; 541 } 542 543 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 544 struct flowi *fl, struct rt6_info *rt, 545 unsigned int flags) 546 { 547 struct ipv6_pinfo *np = inet6_sk(sk); 548 struct ipv6hdr *iph; 549 struct sk_buff *skb; 550 unsigned int hh_len; 551 int err; 552 553 if (length > rt->u.dst.dev->mtu) { 554 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 555 return -EMSGSIZE; 556 } 557 if (flags&MSG_PROBE) 558 goto out; 559 560 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 561 562 skb = sock_alloc_send_skb(sk, length+hh_len+15, 563 flags&MSG_DONTWAIT, &err); 564 if (skb == NULL) 565 goto error; 566 skb_reserve(skb, hh_len); 567 568 skb->priority = sk->sk_priority; 569 skb->dst = dst_clone(&rt->u.dst); 570 571 skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length); 572 573 skb->ip_summed = CHECKSUM_NONE; 574 575 skb->h.raw = skb->nh.raw; 576 err = memcpy_fromiovecend((void *)iph, from, 0, length); 577 if (err) 578 goto error_fault; 579 580 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 581 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 582 dst_output); 583 if (err > 0) 584 err = np->recverr ? net_xmit_errno(err) : 0; 585 if (err) 586 goto error; 587 out: 588 return 0; 589 590 error_fault: 591 err = -EFAULT; 592 kfree_skb(skb); 593 error: 594 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 595 return err; 596 } 597 598 static void rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 599 { 600 struct iovec *iov; 601 u8 __user *type = NULL; 602 u8 __user *code = NULL; 603 int probed = 0; 604 int i; 605 606 if (!msg->msg_iov) 607 return; 608 609 for (i = 0; i < msg->msg_iovlen; i++) { 610 iov = &msg->msg_iov[i]; 611 if (!iov) 612 continue; 613 614 switch (fl->proto) { 615 case IPPROTO_ICMPV6: 616 /* check if one-byte field is readable or not. */ 617 if (iov->iov_base && iov->iov_len < 1) 618 break; 619 620 if (!type) { 621 type = iov->iov_base; 622 /* check if code field is readable or not. */ 623 if (iov->iov_len > 1) 624 code = type + 1; 625 } else if (!code) 626 code = iov->iov_base; 627 628 if (type && code) { 629 get_user(fl->fl_icmp_type, type); 630 __get_user(fl->fl_icmp_code, code); 631 probed = 1; 632 } 633 break; 634 default: 635 probed = 1; 636 break; 637 } 638 if (probed) 639 break; 640 } 641 } 642 643 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 644 struct msghdr *msg, size_t len) 645 { 646 struct ipv6_txoptions opt_space; 647 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 648 struct in6_addr *daddr, *final_p = NULL, final; 649 struct inet_sock *inet = inet_sk(sk); 650 struct ipv6_pinfo *np = inet6_sk(sk); 651 struct raw6_sock *rp = raw6_sk(sk); 652 struct ipv6_txoptions *opt = NULL; 653 struct ip6_flowlabel *flowlabel = NULL; 654 struct dst_entry *dst = NULL; 655 struct flowi fl; 656 int addr_len = msg->msg_namelen; 657 int hlimit = -1; 658 u16 proto; 659 int err; 660 661 /* Rough check on arithmetic overflow, 662 better check is made in ip6_build_xmit 663 */ 664 if (len < 0) 665 return -EMSGSIZE; 666 667 /* Mirror BSD error message compatibility */ 668 if (msg->msg_flags & MSG_OOB) 669 return -EOPNOTSUPP; 670 671 /* 672 * Get and verify the address. 673 */ 674 memset(&fl, 0, sizeof(fl)); 675 676 if (sin6) { 677 if (addr_len < SIN6_LEN_RFC2133) 678 return -EINVAL; 679 680 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 681 return(-EAFNOSUPPORT); 682 683 /* port is the proto value [0..255] carried in nexthdr */ 684 proto = ntohs(sin6->sin6_port); 685 686 if (!proto) 687 proto = inet->num; 688 else if (proto != inet->num) 689 return(-EINVAL); 690 691 if (proto > 255) 692 return(-EINVAL); 693 694 daddr = &sin6->sin6_addr; 695 if (np->sndflow) { 696 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 697 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 698 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 699 if (flowlabel == NULL) 700 return -EINVAL; 701 daddr = &flowlabel->dst; 702 } 703 } 704 705 /* 706 * Otherwise it will be difficult to maintain 707 * sk->sk_dst_cache. 708 */ 709 if (sk->sk_state == TCP_ESTABLISHED && 710 ipv6_addr_equal(daddr, &np->daddr)) 711 daddr = &np->daddr; 712 713 if (addr_len >= sizeof(struct sockaddr_in6) && 714 sin6->sin6_scope_id && 715 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 716 fl.oif = sin6->sin6_scope_id; 717 } else { 718 if (sk->sk_state != TCP_ESTABLISHED) 719 return -EDESTADDRREQ; 720 721 proto = inet->num; 722 daddr = &np->daddr; 723 fl.fl6_flowlabel = np->flow_label; 724 } 725 726 if (ipv6_addr_any(daddr)) { 727 /* 728 * unspecified destination address 729 * treated as error... is this correct ? 730 */ 731 fl6_sock_release(flowlabel); 732 return(-EINVAL); 733 } 734 735 if (fl.oif == 0) 736 fl.oif = sk->sk_bound_dev_if; 737 738 if (msg->msg_controllen) { 739 opt = &opt_space; 740 memset(opt, 0, sizeof(struct ipv6_txoptions)); 741 opt->tot_len = sizeof(struct ipv6_txoptions); 742 743 err = datagram_send_ctl(msg, &fl, opt, &hlimit); 744 if (err < 0) { 745 fl6_sock_release(flowlabel); 746 return err; 747 } 748 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 749 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 750 if (flowlabel == NULL) 751 return -EINVAL; 752 } 753 if (!(opt->opt_nflen|opt->opt_flen)) 754 opt = NULL; 755 } 756 if (opt == NULL) 757 opt = np->opt; 758 if (flowlabel) 759 opt = fl6_merge_options(&opt_space, flowlabel, opt); 760 761 fl.proto = proto; 762 rawv6_probe_proto_opt(&fl, msg); 763 764 ipv6_addr_copy(&fl.fl6_dst, daddr); 765 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 766 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 767 768 /* merge ip6_build_xmit from ip6_output */ 769 if (opt && opt->srcrt) { 770 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 771 ipv6_addr_copy(&final, &fl.fl6_dst); 772 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 773 final_p = &final; 774 } 775 776 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 777 fl.oif = np->mcast_oif; 778 779 err = ip6_dst_lookup(sk, &dst, &fl); 780 if (err) 781 goto out; 782 if (final_p) 783 ipv6_addr_copy(&fl.fl6_dst, final_p); 784 785 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 786 dst_release(dst); 787 goto out; 788 } 789 790 if (hlimit < 0) { 791 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 792 hlimit = np->mcast_hops; 793 else 794 hlimit = np->hop_limit; 795 if (hlimit < 0) 796 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 797 if (hlimit < 0) 798 hlimit = ipv6_get_hoplimit(dst->dev); 799 } 800 801 if (msg->msg_flags&MSG_CONFIRM) 802 goto do_confirm; 803 804 back_from_confirm: 805 if (inet->hdrincl) { 806 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 807 } else { 808 lock_sock(sk); 809 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 810 hlimit, opt, &fl, (struct rt6_info*)dst, msg->msg_flags); 811 812 if (err) 813 ip6_flush_pending_frames(sk); 814 else if (!(msg->msg_flags & MSG_MORE)) 815 err = rawv6_push_pending_frames(sk, &fl, rp); 816 } 817 done: 818 ip6_dst_store(sk, dst, 819 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 820 &np->daddr : NULL); 821 822 release_sock(sk); 823 out: 824 fl6_sock_release(flowlabel); 825 return err<0?err:len; 826 do_confirm: 827 dst_confirm(dst); 828 if (!(msg->msg_flags & MSG_PROBE) || len) 829 goto back_from_confirm; 830 err = 0; 831 goto done; 832 } 833 834 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 835 char __user *optval, int optlen) 836 { 837 switch (optname) { 838 case ICMPV6_FILTER: 839 if (optlen > sizeof(struct icmp6_filter)) 840 optlen = sizeof(struct icmp6_filter); 841 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 842 return -EFAULT; 843 return 0; 844 default: 845 return -ENOPROTOOPT; 846 }; 847 848 return 0; 849 } 850 851 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 852 char __user *optval, int __user *optlen) 853 { 854 int len; 855 856 switch (optname) { 857 case ICMPV6_FILTER: 858 if (get_user(len, optlen)) 859 return -EFAULT; 860 if (len < 0) 861 return -EINVAL; 862 if (len > sizeof(struct icmp6_filter)) 863 len = sizeof(struct icmp6_filter); 864 if (put_user(len, optlen)) 865 return -EFAULT; 866 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 867 return -EFAULT; 868 return 0; 869 default: 870 return -ENOPROTOOPT; 871 }; 872 873 return 0; 874 } 875 876 877 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 878 char __user *optval, int optlen) 879 { 880 struct raw6_sock *rp = raw6_sk(sk); 881 int val; 882 883 switch(level) { 884 case SOL_RAW: 885 break; 886 887 case SOL_ICMPV6: 888 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 889 return -EOPNOTSUPP; 890 return rawv6_seticmpfilter(sk, level, optname, optval, 891 optlen); 892 case SOL_IPV6: 893 if (optname == IPV6_CHECKSUM) 894 break; 895 default: 896 return ipv6_setsockopt(sk, level, optname, optval, 897 optlen); 898 }; 899 900 if (get_user(val, (int __user *)optval)) 901 return -EFAULT; 902 903 switch (optname) { 904 case IPV6_CHECKSUM: 905 /* You may get strange result with a positive odd offset; 906 RFC2292bis agrees with me. */ 907 if (val > 0 && (val&1)) 908 return(-EINVAL); 909 if (val < 0) { 910 rp->checksum = 0; 911 } else { 912 rp->checksum = 1; 913 rp->offset = val; 914 } 915 916 return 0; 917 break; 918 919 default: 920 return(-ENOPROTOOPT); 921 } 922 } 923 924 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 925 char __user *optval, int __user *optlen) 926 { 927 struct raw6_sock *rp = raw6_sk(sk); 928 int val, len; 929 930 switch(level) { 931 case SOL_RAW: 932 break; 933 934 case SOL_ICMPV6: 935 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 936 return -EOPNOTSUPP; 937 return rawv6_geticmpfilter(sk, level, optname, optval, 938 optlen); 939 case SOL_IPV6: 940 if (optname == IPV6_CHECKSUM) 941 break; 942 default: 943 return ipv6_getsockopt(sk, level, optname, optval, 944 optlen); 945 }; 946 947 if (get_user(len,optlen)) 948 return -EFAULT; 949 950 switch (optname) { 951 case IPV6_CHECKSUM: 952 if (rp->checksum == 0) 953 val = -1; 954 else 955 val = rp->offset; 956 break; 957 958 default: 959 return -ENOPROTOOPT; 960 } 961 962 len = min_t(unsigned int, sizeof(int), len); 963 964 if (put_user(len, optlen)) 965 return -EFAULT; 966 if (copy_to_user(optval,&val,len)) 967 return -EFAULT; 968 return 0; 969 } 970 971 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 972 { 973 switch(cmd) { 974 case SIOCOUTQ: 975 { 976 int amount = atomic_read(&sk->sk_wmem_alloc); 977 return put_user(amount, (int __user *)arg); 978 } 979 case SIOCINQ: 980 { 981 struct sk_buff *skb; 982 int amount = 0; 983 984 spin_lock_bh(&sk->sk_receive_queue.lock); 985 skb = skb_peek(&sk->sk_receive_queue); 986 if (skb != NULL) 987 amount = skb->tail - skb->h.raw; 988 spin_unlock_bh(&sk->sk_receive_queue.lock); 989 return put_user(amount, (int __user *)arg); 990 } 991 992 default: 993 return -ENOIOCTLCMD; 994 } 995 } 996 997 static void rawv6_close(struct sock *sk, long timeout) 998 { 999 if (inet_sk(sk)->num == IPPROTO_RAW) 1000 ip6_ra_control(sk, -1, NULL); 1001 1002 sk_common_release(sk); 1003 } 1004 1005 static int rawv6_init_sk(struct sock *sk) 1006 { 1007 if (inet_sk(sk)->num == IPPROTO_ICMPV6) { 1008 struct raw6_sock *rp = raw6_sk(sk); 1009 rp->checksum = 1; 1010 rp->offset = 2; 1011 } 1012 return(0); 1013 } 1014 1015 struct proto rawv6_prot = { 1016 .name = "RAWv6", 1017 .owner = THIS_MODULE, 1018 .close = rawv6_close, 1019 .connect = ip6_datagram_connect, 1020 .disconnect = udp_disconnect, 1021 .ioctl = rawv6_ioctl, 1022 .init = rawv6_init_sk, 1023 .destroy = inet6_destroy_sock, 1024 .setsockopt = rawv6_setsockopt, 1025 .getsockopt = rawv6_getsockopt, 1026 .sendmsg = rawv6_sendmsg, 1027 .recvmsg = rawv6_recvmsg, 1028 .bind = rawv6_bind, 1029 .backlog_rcv = rawv6_rcv_skb, 1030 .hash = raw_v6_hash, 1031 .unhash = raw_v6_unhash, 1032 .obj_size = sizeof(struct raw6_sock), 1033 }; 1034 1035 #ifdef CONFIG_PROC_FS 1036 struct raw6_iter_state { 1037 int bucket; 1038 }; 1039 1040 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private) 1041 1042 static struct sock *raw6_get_first(struct seq_file *seq) 1043 { 1044 struct sock *sk; 1045 struct hlist_node *node; 1046 struct raw6_iter_state* state = raw6_seq_private(seq); 1047 1048 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket) 1049 sk_for_each(sk, node, &raw_v6_htable[state->bucket]) 1050 if (sk->sk_family == PF_INET6) 1051 goto out; 1052 sk = NULL; 1053 out: 1054 return sk; 1055 } 1056 1057 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk) 1058 { 1059 struct raw6_iter_state* state = raw6_seq_private(seq); 1060 1061 do { 1062 sk = sk_next(sk); 1063 try_again: 1064 ; 1065 } while (sk && sk->sk_family != PF_INET6); 1066 1067 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) { 1068 sk = sk_head(&raw_v6_htable[state->bucket]); 1069 goto try_again; 1070 } 1071 return sk; 1072 } 1073 1074 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos) 1075 { 1076 struct sock *sk = raw6_get_first(seq); 1077 if (sk) 1078 while (pos && (sk = raw6_get_next(seq, sk)) != NULL) 1079 --pos; 1080 return pos ? NULL : sk; 1081 } 1082 1083 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos) 1084 { 1085 read_lock(&raw_v6_lock); 1086 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1087 } 1088 1089 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1090 { 1091 struct sock *sk; 1092 1093 if (v == SEQ_START_TOKEN) 1094 sk = raw6_get_first(seq); 1095 else 1096 sk = raw6_get_next(seq, v); 1097 ++*pos; 1098 return sk; 1099 } 1100 1101 static void raw6_seq_stop(struct seq_file *seq, void *v) 1102 { 1103 read_unlock(&raw_v6_lock); 1104 } 1105 1106 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1107 { 1108 struct ipv6_pinfo *np = inet6_sk(sp); 1109 struct in6_addr *dest, *src; 1110 __u16 destp, srcp; 1111 1112 dest = &np->daddr; 1113 src = &np->rcv_saddr; 1114 destp = 0; 1115 srcp = inet_sk(sp)->num; 1116 seq_printf(seq, 1117 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1118 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1119 i, 1120 src->s6_addr32[0], src->s6_addr32[1], 1121 src->s6_addr32[2], src->s6_addr32[3], srcp, 1122 dest->s6_addr32[0], dest->s6_addr32[1], 1123 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1124 sp->sk_state, 1125 atomic_read(&sp->sk_wmem_alloc), 1126 atomic_read(&sp->sk_rmem_alloc), 1127 0, 0L, 0, 1128 sock_i_uid(sp), 0, 1129 sock_i_ino(sp), 1130 atomic_read(&sp->sk_refcnt), sp); 1131 } 1132 1133 static int raw6_seq_show(struct seq_file *seq, void *v) 1134 { 1135 if (v == SEQ_START_TOKEN) 1136 seq_printf(seq, 1137 " sl " 1138 "local_address " 1139 "remote_address " 1140 "st tx_queue rx_queue tr tm->when retrnsmt" 1141 " uid timeout inode\n"); 1142 else 1143 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket); 1144 return 0; 1145 } 1146 1147 static struct seq_operations raw6_seq_ops = { 1148 .start = raw6_seq_start, 1149 .next = raw6_seq_next, 1150 .stop = raw6_seq_stop, 1151 .show = raw6_seq_show, 1152 }; 1153 1154 static int raw6_seq_open(struct inode *inode, struct file *file) 1155 { 1156 struct seq_file *seq; 1157 int rc = -ENOMEM; 1158 struct raw6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 1159 if (!s) 1160 goto out; 1161 rc = seq_open(file, &raw6_seq_ops); 1162 if (rc) 1163 goto out_kfree; 1164 seq = file->private_data; 1165 seq->private = s; 1166 memset(s, 0, sizeof(*s)); 1167 out: 1168 return rc; 1169 out_kfree: 1170 kfree(s); 1171 goto out; 1172 } 1173 1174 static struct file_operations raw6_seq_fops = { 1175 .owner = THIS_MODULE, 1176 .open = raw6_seq_open, 1177 .read = seq_read, 1178 .llseek = seq_lseek, 1179 .release = seq_release_private, 1180 }; 1181 1182 int __init raw6_proc_init(void) 1183 { 1184 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops)) 1185 return -ENOMEM; 1186 return 0; 1187 } 1188 1189 void raw6_proc_exit(void) 1190 { 1191 proc_net_remove("raw6"); 1192 } 1193 #endif /* CONFIG_PROC_FS */ 1194