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 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, IP6CB(skb)->iif); 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 nf_reset(clone); 179 rawv6_rcv(sk, clone); 180 } 181 } 182 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr, 183 IP6CB(skb)->iif); 184 } 185 out: 186 read_unlock(&raw_v6_lock); 187 return delivered; 188 } 189 190 /* This cleans up af_inet6 a bit. -DaveM */ 191 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 192 { 193 struct inet_sock *inet = inet_sk(sk); 194 struct ipv6_pinfo *np = inet6_sk(sk); 195 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 196 __u32 v4addr = 0; 197 int addr_type; 198 int err; 199 200 if (addr_len < SIN6_LEN_RFC2133) 201 return -EINVAL; 202 addr_type = ipv6_addr_type(&addr->sin6_addr); 203 204 /* Raw sockets are IPv6 only */ 205 if (addr_type == IPV6_ADDR_MAPPED) 206 return(-EADDRNOTAVAIL); 207 208 lock_sock(sk); 209 210 err = -EINVAL; 211 if (sk->sk_state != TCP_CLOSE) 212 goto out; 213 214 /* Check if the address belongs to the host. */ 215 if (addr_type != IPV6_ADDR_ANY) { 216 struct net_device *dev = NULL; 217 218 if (addr_type & IPV6_ADDR_LINKLOCAL) { 219 if (addr_len >= sizeof(struct sockaddr_in6) && 220 addr->sin6_scope_id) { 221 /* Override any existing binding, if another 222 * one is supplied by user. 223 */ 224 sk->sk_bound_dev_if = addr->sin6_scope_id; 225 } 226 227 /* Binding to link-local address requires an interface */ 228 if (!sk->sk_bound_dev_if) 229 goto out; 230 231 dev = dev_get_by_index(sk->sk_bound_dev_if); 232 if (!dev) { 233 err = -ENODEV; 234 goto out; 235 } 236 } 237 238 /* ipv4 addr of the socket is invalid. Only the 239 * unspecified and mapped address have a v4 equivalent. 240 */ 241 v4addr = LOOPBACK4_IPV6; 242 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 243 err = -EADDRNOTAVAIL; 244 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 245 if (dev) 246 dev_put(dev); 247 goto out; 248 } 249 } 250 if (dev) 251 dev_put(dev); 252 } 253 254 inet->rcv_saddr = inet->saddr = v4addr; 255 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 256 if (!(addr_type & IPV6_ADDR_MULTICAST)) 257 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 258 err = 0; 259 out: 260 release_sock(sk); 261 return err; 262 } 263 264 void rawv6_err(struct sock *sk, struct sk_buff *skb, 265 struct inet6_skb_parm *opt, 266 int type, int code, int offset, u32 info) 267 { 268 struct inet_sock *inet = inet_sk(sk); 269 struct ipv6_pinfo *np = inet6_sk(sk); 270 int err; 271 int harderr; 272 273 /* Report error on raw socket, if: 274 1. User requested recverr. 275 2. Socket is connected (otherwise the error indication 276 is useless without recverr and error is hard. 277 */ 278 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 279 return; 280 281 harderr = icmpv6_err_convert(type, code, &err); 282 if (type == ICMPV6_PKT_TOOBIG) 283 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 284 285 if (np->recverr) { 286 u8 *payload = skb->data; 287 if (!inet->hdrincl) 288 payload += offset; 289 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 290 } 291 292 if (np->recverr || harderr) { 293 sk->sk_err = err; 294 sk->sk_error_report(sk); 295 } 296 } 297 298 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 299 { 300 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 301 skb_checksum_complete(skb)) { 302 /* FIXME: increment a raw6 drops counter here */ 303 kfree_skb(skb); 304 return 0; 305 } 306 307 /* Charge it to the socket. */ 308 if (sock_queue_rcv_skb(sk,skb)<0) { 309 /* FIXME: increment a raw6 drops counter here */ 310 kfree_skb(skb); 311 return 0; 312 } 313 314 return 0; 315 } 316 317 /* 318 * This is next to useless... 319 * if we demultiplex in network layer we don't need the extra call 320 * just to queue the skb... 321 * maybe we could have the network decide upon a hint if it 322 * should call raw_rcv for demultiplexing 323 */ 324 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 325 { 326 struct inet_sock *inet = inet_sk(sk); 327 struct raw6_sock *rp = raw6_sk(sk); 328 329 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 330 kfree_skb(skb); 331 return NET_RX_DROP; 332 } 333 334 if (!rp->checksum) 335 skb->ip_summed = CHECKSUM_UNNECESSARY; 336 337 if (skb->ip_summed == CHECKSUM_HW) { 338 skb_postpull_rcsum(skb, skb->nh.raw, 339 skb->h.raw - skb->nh.raw); 340 if (!csum_ipv6_magic(&skb->nh.ipv6h->saddr, 341 &skb->nh.ipv6h->daddr, 342 skb->len, inet->num, skb->csum)) 343 skb->ip_summed = CHECKSUM_UNNECESSARY; 344 } 345 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 346 skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr, 347 &skb->nh.ipv6h->daddr, 348 skb->len, inet->num, 0); 349 350 if (inet->hdrincl) { 351 if (skb_checksum_complete(skb)) { 352 /* FIXME: increment a raw6 drops counter here */ 353 kfree_skb(skb); 354 return 0; 355 } 356 } 357 358 rawv6_rcv_skb(sk, skb); 359 return 0; 360 } 361 362 363 /* 364 * This should be easy, if there is something there 365 * we return it, otherwise we block. 366 */ 367 368 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 369 struct msghdr *msg, size_t len, 370 int noblock, int flags, int *addr_len) 371 { 372 struct ipv6_pinfo *np = inet6_sk(sk); 373 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 374 struct sk_buff *skb; 375 size_t copied; 376 int err; 377 378 if (flags & MSG_OOB) 379 return -EOPNOTSUPP; 380 381 if (addr_len) 382 *addr_len=sizeof(*sin6); 383 384 if (flags & MSG_ERRQUEUE) 385 return ipv6_recv_error(sk, msg, len); 386 387 skb = skb_recv_datagram(sk, flags, noblock, &err); 388 if (!skb) 389 goto out; 390 391 copied = skb->len; 392 if (copied > len) { 393 copied = len; 394 msg->msg_flags |= MSG_TRUNC; 395 } 396 397 if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 398 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 399 } else if (msg->msg_flags&MSG_TRUNC) { 400 if (__skb_checksum_complete(skb)) 401 goto csum_copy_err; 402 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 403 } else { 404 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 405 if (err == -EINVAL) 406 goto csum_copy_err; 407 } 408 if (err) 409 goto out_free; 410 411 /* Copy the address. */ 412 if (sin6) { 413 sin6->sin6_family = AF_INET6; 414 sin6->sin6_port = 0; 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->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 dst_release(dst); 808 release_sock(sk); 809 out: 810 fl6_sock_release(flowlabel); 811 return err<0?err:len; 812 do_confirm: 813 dst_confirm(dst); 814 if (!(msg->msg_flags & MSG_PROBE) || len) 815 goto back_from_confirm; 816 err = 0; 817 goto done; 818 } 819 820 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 821 char __user *optval, int optlen) 822 { 823 switch (optname) { 824 case ICMPV6_FILTER: 825 if (optlen > sizeof(struct icmp6_filter)) 826 optlen = sizeof(struct icmp6_filter); 827 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 828 return -EFAULT; 829 return 0; 830 default: 831 return -ENOPROTOOPT; 832 }; 833 834 return 0; 835 } 836 837 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 838 char __user *optval, int __user *optlen) 839 { 840 int len; 841 842 switch (optname) { 843 case ICMPV6_FILTER: 844 if (get_user(len, optlen)) 845 return -EFAULT; 846 if (len < 0) 847 return -EINVAL; 848 if (len > sizeof(struct icmp6_filter)) 849 len = sizeof(struct icmp6_filter); 850 if (put_user(len, optlen)) 851 return -EFAULT; 852 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 853 return -EFAULT; 854 return 0; 855 default: 856 return -ENOPROTOOPT; 857 }; 858 859 return 0; 860 } 861 862 863 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 864 char __user *optval, int optlen) 865 { 866 struct raw6_sock *rp = raw6_sk(sk); 867 int val; 868 869 if (get_user(val, (int __user *)optval)) 870 return -EFAULT; 871 872 switch (optname) { 873 case IPV6_CHECKSUM: 874 /* You may get strange result with a positive odd offset; 875 RFC2292bis agrees with me. */ 876 if (val > 0 && (val&1)) 877 return(-EINVAL); 878 if (val < 0) { 879 rp->checksum = 0; 880 } else { 881 rp->checksum = 1; 882 rp->offset = val; 883 } 884 885 return 0; 886 break; 887 888 default: 889 return(-ENOPROTOOPT); 890 } 891 } 892 893 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 894 char __user *optval, int optlen) 895 { 896 switch(level) { 897 case SOL_RAW: 898 break; 899 900 case SOL_ICMPV6: 901 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 902 return -EOPNOTSUPP; 903 return rawv6_seticmpfilter(sk, level, optname, optval, 904 optlen); 905 case SOL_IPV6: 906 if (optname == IPV6_CHECKSUM) 907 break; 908 default: 909 return ipv6_setsockopt(sk, level, optname, optval, 910 optlen); 911 }; 912 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 913 } 914 915 #ifdef CONFIG_COMPAT 916 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 917 char __user *optval, int optlen) 918 { 919 switch (level) { 920 case SOL_RAW: 921 break; 922 case SOL_ICMPV6: 923 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 924 return -EOPNOTSUPP; 925 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 926 case SOL_IPV6: 927 if (optname == IPV6_CHECKSUM) 928 break; 929 default: 930 return compat_ipv6_setsockopt(sk, level, optname, 931 optval, optlen); 932 }; 933 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 934 } 935 #endif 936 937 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 938 char __user *optval, int __user *optlen) 939 { 940 struct raw6_sock *rp = raw6_sk(sk); 941 int val, len; 942 943 if (get_user(len,optlen)) 944 return -EFAULT; 945 946 switch (optname) { 947 case IPV6_CHECKSUM: 948 if (rp->checksum == 0) 949 val = -1; 950 else 951 val = rp->offset; 952 break; 953 954 default: 955 return -ENOPROTOOPT; 956 } 957 958 len = min_t(unsigned int, sizeof(int), len); 959 960 if (put_user(len, optlen)) 961 return -EFAULT; 962 if (copy_to_user(optval,&val,len)) 963 return -EFAULT; 964 return 0; 965 } 966 967 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 968 char __user *optval, int __user *optlen) 969 { 970 switch(level) { 971 case SOL_RAW: 972 break; 973 974 case SOL_ICMPV6: 975 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 976 return -EOPNOTSUPP; 977 return rawv6_geticmpfilter(sk, level, optname, optval, 978 optlen); 979 case SOL_IPV6: 980 if (optname == IPV6_CHECKSUM) 981 break; 982 default: 983 return ipv6_getsockopt(sk, level, optname, optval, 984 optlen); 985 }; 986 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 987 } 988 989 #ifdef CONFIG_COMPAT 990 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 991 char __user *optval, int __user *optlen) 992 { 993 switch (level) { 994 case SOL_RAW: 995 break; 996 case SOL_ICMPV6: 997 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 998 return -EOPNOTSUPP; 999 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1000 case SOL_IPV6: 1001 if (optname == IPV6_CHECKSUM) 1002 break; 1003 default: 1004 return compat_ipv6_getsockopt(sk, level, optname, 1005 optval, optlen); 1006 }; 1007 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1008 } 1009 #endif 1010 1011 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1012 { 1013 switch(cmd) { 1014 case SIOCOUTQ: 1015 { 1016 int amount = atomic_read(&sk->sk_wmem_alloc); 1017 return put_user(amount, (int __user *)arg); 1018 } 1019 case SIOCINQ: 1020 { 1021 struct sk_buff *skb; 1022 int amount = 0; 1023 1024 spin_lock_bh(&sk->sk_receive_queue.lock); 1025 skb = skb_peek(&sk->sk_receive_queue); 1026 if (skb != NULL) 1027 amount = skb->tail - skb->h.raw; 1028 spin_unlock_bh(&sk->sk_receive_queue.lock); 1029 return put_user(amount, (int __user *)arg); 1030 } 1031 1032 default: 1033 return -ENOIOCTLCMD; 1034 } 1035 } 1036 1037 static void rawv6_close(struct sock *sk, long timeout) 1038 { 1039 if (inet_sk(sk)->num == IPPROTO_RAW) 1040 ip6_ra_control(sk, -1, NULL); 1041 1042 sk_common_release(sk); 1043 } 1044 1045 static int rawv6_init_sk(struct sock *sk) 1046 { 1047 if (inet_sk(sk)->num == IPPROTO_ICMPV6) { 1048 struct raw6_sock *rp = raw6_sk(sk); 1049 rp->checksum = 1; 1050 rp->offset = 2; 1051 } 1052 return(0); 1053 } 1054 1055 struct proto rawv6_prot = { 1056 .name = "RAWv6", 1057 .owner = THIS_MODULE, 1058 .close = rawv6_close, 1059 .connect = ip6_datagram_connect, 1060 .disconnect = udp_disconnect, 1061 .ioctl = rawv6_ioctl, 1062 .init = rawv6_init_sk, 1063 .destroy = inet6_destroy_sock, 1064 .setsockopt = rawv6_setsockopt, 1065 .getsockopt = rawv6_getsockopt, 1066 .sendmsg = rawv6_sendmsg, 1067 .recvmsg = rawv6_recvmsg, 1068 .bind = rawv6_bind, 1069 .backlog_rcv = rawv6_rcv_skb, 1070 .hash = raw_v6_hash, 1071 .unhash = raw_v6_unhash, 1072 .obj_size = sizeof(struct raw6_sock), 1073 #ifdef CONFIG_COMPAT 1074 .compat_setsockopt = compat_rawv6_setsockopt, 1075 .compat_getsockopt = compat_rawv6_getsockopt, 1076 #endif 1077 }; 1078 1079 #ifdef CONFIG_PROC_FS 1080 struct raw6_iter_state { 1081 int bucket; 1082 }; 1083 1084 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private) 1085 1086 static struct sock *raw6_get_first(struct seq_file *seq) 1087 { 1088 struct sock *sk; 1089 struct hlist_node *node; 1090 struct raw6_iter_state* state = raw6_seq_private(seq); 1091 1092 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket) 1093 sk_for_each(sk, node, &raw_v6_htable[state->bucket]) 1094 if (sk->sk_family == PF_INET6) 1095 goto out; 1096 sk = NULL; 1097 out: 1098 return sk; 1099 } 1100 1101 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk) 1102 { 1103 struct raw6_iter_state* state = raw6_seq_private(seq); 1104 1105 do { 1106 sk = sk_next(sk); 1107 try_again: 1108 ; 1109 } while (sk && sk->sk_family != PF_INET6); 1110 1111 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) { 1112 sk = sk_head(&raw_v6_htable[state->bucket]); 1113 goto try_again; 1114 } 1115 return sk; 1116 } 1117 1118 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos) 1119 { 1120 struct sock *sk = raw6_get_first(seq); 1121 if (sk) 1122 while (pos && (sk = raw6_get_next(seq, sk)) != NULL) 1123 --pos; 1124 return pos ? NULL : sk; 1125 } 1126 1127 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos) 1128 { 1129 read_lock(&raw_v6_lock); 1130 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1131 } 1132 1133 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1134 { 1135 struct sock *sk; 1136 1137 if (v == SEQ_START_TOKEN) 1138 sk = raw6_get_first(seq); 1139 else 1140 sk = raw6_get_next(seq, v); 1141 ++*pos; 1142 return sk; 1143 } 1144 1145 static void raw6_seq_stop(struct seq_file *seq, void *v) 1146 { 1147 read_unlock(&raw_v6_lock); 1148 } 1149 1150 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1151 { 1152 struct ipv6_pinfo *np = inet6_sk(sp); 1153 struct in6_addr *dest, *src; 1154 __u16 destp, srcp; 1155 1156 dest = &np->daddr; 1157 src = &np->rcv_saddr; 1158 destp = 0; 1159 srcp = inet_sk(sp)->num; 1160 seq_printf(seq, 1161 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1162 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1163 i, 1164 src->s6_addr32[0], src->s6_addr32[1], 1165 src->s6_addr32[2], src->s6_addr32[3], srcp, 1166 dest->s6_addr32[0], dest->s6_addr32[1], 1167 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1168 sp->sk_state, 1169 atomic_read(&sp->sk_wmem_alloc), 1170 atomic_read(&sp->sk_rmem_alloc), 1171 0, 0L, 0, 1172 sock_i_uid(sp), 0, 1173 sock_i_ino(sp), 1174 atomic_read(&sp->sk_refcnt), sp); 1175 } 1176 1177 static int raw6_seq_show(struct seq_file *seq, void *v) 1178 { 1179 if (v == SEQ_START_TOKEN) 1180 seq_printf(seq, 1181 " sl " 1182 "local_address " 1183 "remote_address " 1184 "st tx_queue rx_queue tr tm->when retrnsmt" 1185 " uid timeout inode\n"); 1186 else 1187 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket); 1188 return 0; 1189 } 1190 1191 static struct seq_operations raw6_seq_ops = { 1192 .start = raw6_seq_start, 1193 .next = raw6_seq_next, 1194 .stop = raw6_seq_stop, 1195 .show = raw6_seq_show, 1196 }; 1197 1198 static int raw6_seq_open(struct inode *inode, struct file *file) 1199 { 1200 struct seq_file *seq; 1201 int rc = -ENOMEM; 1202 struct raw6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 1203 if (!s) 1204 goto out; 1205 rc = seq_open(file, &raw6_seq_ops); 1206 if (rc) 1207 goto out_kfree; 1208 seq = file->private_data; 1209 seq->private = s; 1210 out: 1211 return rc; 1212 out_kfree: 1213 kfree(s); 1214 goto out; 1215 } 1216 1217 static struct file_operations raw6_seq_fops = { 1218 .owner = THIS_MODULE, 1219 .open = raw6_seq_open, 1220 .read = seq_read, 1221 .llseek = seq_lseek, 1222 .release = seq_release_private, 1223 }; 1224 1225 int __init raw6_proc_init(void) 1226 { 1227 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops)) 1228 return -ENOMEM; 1229 return 0; 1230 } 1231 1232 void raw6_proc_exit(void) 1233 { 1234 proc_net_remove("raw6"); 1235 } 1236 #endif /* CONFIG_PROC_FS */ 1237