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/net.h> 28 #include <linux/in6.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_arp.h> 31 #include <linux/icmpv6.h> 32 #include <linux/netfilter.h> 33 #include <linux/netfilter_ipv6.h> 34 #include <linux/skbuff.h> 35 #include <asm/uaccess.h> 36 #include <asm/ioctls.h> 37 38 #include <net/ip.h> 39 #include <net/sock.h> 40 #include <net/snmp.h> 41 42 #include <net/ipv6.h> 43 #include <net/ndisc.h> 44 #include <net/protocol.h> 45 #include <net/ip6_route.h> 46 #include <net/ip6_checksum.h> 47 #include <net/addrconf.h> 48 #include <net/transp_v6.h> 49 #include <net/udp.h> 50 #include <net/inet_common.h> 51 #include <net/tcp_states.h> 52 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 53 #include <net/mip6.h> 54 #endif 55 56 #include <net/rawv6.h> 57 #include <net/xfrm.h> 58 59 #include <linux/proc_fs.h> 60 #include <linux/seq_file.h> 61 62 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE]; 63 DEFINE_RWLOCK(raw_v6_lock); 64 65 static void raw_v6_hash(struct sock *sk) 66 { 67 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num & 68 (RAWV6_HTABLE_SIZE - 1)]; 69 70 write_lock_bh(&raw_v6_lock); 71 sk_add_node(sk, list); 72 sock_prot_inc_use(sk->sk_prot); 73 write_unlock_bh(&raw_v6_lock); 74 } 75 76 static void raw_v6_unhash(struct sock *sk) 77 { 78 write_lock_bh(&raw_v6_lock); 79 if (sk_del_node_init(sk)) 80 sock_prot_dec_use(sk->sk_prot); 81 write_unlock_bh(&raw_v6_lock); 82 } 83 84 85 /* Grumble... icmp and ip_input want to get at this... */ 86 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num, 87 struct in6_addr *loc_addr, struct in6_addr *rmt_addr, 88 int dif) 89 { 90 struct hlist_node *node; 91 int is_multicast = ipv6_addr_is_multicast(loc_addr); 92 93 sk_for_each_from(sk, node) 94 if (inet_sk(sk)->num == num) { 95 struct ipv6_pinfo *np = inet6_sk(sk); 96 97 if (!ipv6_addr_any(&np->daddr) && 98 !ipv6_addr_equal(&np->daddr, rmt_addr)) 99 continue; 100 101 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 102 continue; 103 104 if (!ipv6_addr_any(&np->rcv_saddr)) { 105 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 106 goto found; 107 if (is_multicast && 108 inet6_mc_check(sk, loc_addr, rmt_addr)) 109 goto found; 110 continue; 111 } 112 goto found; 113 } 114 sk = NULL; 115 found: 116 return sk; 117 } 118 119 /* 120 * 0 - deliver 121 * 1 - block 122 */ 123 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 124 { 125 struct icmp6hdr *icmph; 126 struct raw6_sock *rp = raw6_sk(sk); 127 128 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 129 __u32 *data = &rp->filter.data[0]; 130 int bit_nr; 131 132 icmph = (struct icmp6hdr *) skb->data; 133 bit_nr = icmph->icmp6_type; 134 135 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 136 } 137 return 0; 138 } 139 140 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 141 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb); 142 143 int rawv6_mh_filter_register(int (*filter)(struct sock *sock, 144 struct sk_buff *skb)) 145 { 146 rcu_assign_pointer(mh_filter, filter); 147 return 0; 148 } 149 EXPORT_SYMBOL(rawv6_mh_filter_register); 150 151 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock, 152 struct sk_buff *skb)) 153 { 154 rcu_assign_pointer(mh_filter, NULL); 155 synchronize_rcu(); 156 return 0; 157 } 158 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 159 160 #endif 161 162 /* 163 * demultiplex raw sockets. 164 * (should consider queueing the skb in the sock receive_queue 165 * without calling rawv6.c) 166 * 167 * Caller owns SKB so we must make clones. 168 */ 169 int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 170 { 171 struct in6_addr *saddr; 172 struct in6_addr *daddr; 173 struct sock *sk; 174 int delivered = 0; 175 __u8 hash; 176 177 saddr = &ipv6_hdr(skb)->saddr; 178 daddr = saddr + 1; 179 180 hash = nexthdr & (MAX_INET_PROTOS - 1); 181 182 read_lock(&raw_v6_lock); 183 sk = sk_head(&raw_v6_htable[hash]); 184 185 /* 186 * The first socket found will be delivered after 187 * delivery to transport protocols. 188 */ 189 190 if (sk == NULL) 191 goto out; 192 193 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 194 195 while (sk) { 196 int filtered; 197 198 delivered = 1; 199 switch (nexthdr) { 200 case IPPROTO_ICMPV6: 201 filtered = icmpv6_filter(sk, skb); 202 break; 203 204 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 205 case IPPROTO_MH: 206 { 207 /* XXX: To validate MH only once for each packet, 208 * this is placed here. It should be after checking 209 * xfrm policy, however it doesn't. The checking xfrm 210 * policy is placed in rawv6_rcv() because it is 211 * required for each socket. 212 */ 213 int (*filter)(struct sock *sock, struct sk_buff *skb); 214 215 filter = rcu_dereference(mh_filter); 216 filtered = filter ? filter(sk, skb) : 0; 217 break; 218 } 219 #endif 220 default: 221 filtered = 0; 222 break; 223 } 224 225 if (filtered < 0) 226 break; 227 if (filtered == 0) { 228 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 229 230 /* Not releasing hash table! */ 231 if (clone) { 232 nf_reset(clone); 233 rawv6_rcv(sk, clone); 234 } 235 } 236 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr, 237 IP6CB(skb)->iif); 238 } 239 out: 240 read_unlock(&raw_v6_lock); 241 return delivered; 242 } 243 244 /* This cleans up af_inet6 a bit. -DaveM */ 245 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 246 { 247 struct inet_sock *inet = inet_sk(sk); 248 struct ipv6_pinfo *np = inet6_sk(sk); 249 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 250 __be32 v4addr = 0; 251 int addr_type; 252 int err; 253 254 if (addr_len < SIN6_LEN_RFC2133) 255 return -EINVAL; 256 addr_type = ipv6_addr_type(&addr->sin6_addr); 257 258 /* Raw sockets are IPv6 only */ 259 if (addr_type == IPV6_ADDR_MAPPED) 260 return(-EADDRNOTAVAIL); 261 262 lock_sock(sk); 263 264 err = -EINVAL; 265 if (sk->sk_state != TCP_CLOSE) 266 goto out; 267 268 /* Check if the address belongs to the host. */ 269 if (addr_type != IPV6_ADDR_ANY) { 270 struct net_device *dev = NULL; 271 272 if (addr_type & IPV6_ADDR_LINKLOCAL) { 273 if (addr_len >= sizeof(struct sockaddr_in6) && 274 addr->sin6_scope_id) { 275 /* Override any existing binding, if another 276 * one is supplied by user. 277 */ 278 sk->sk_bound_dev_if = addr->sin6_scope_id; 279 } 280 281 /* Binding to link-local address requires an interface */ 282 if (!sk->sk_bound_dev_if) 283 goto out; 284 285 dev = dev_get_by_index(sk->sk_bound_dev_if); 286 if (!dev) { 287 err = -ENODEV; 288 goto out; 289 } 290 } 291 292 /* ipv4 addr of the socket is invalid. Only the 293 * unspecified and mapped address have a v4 equivalent. 294 */ 295 v4addr = LOOPBACK4_IPV6; 296 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 297 err = -EADDRNOTAVAIL; 298 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 299 if (dev) 300 dev_put(dev); 301 goto out; 302 } 303 } 304 if (dev) 305 dev_put(dev); 306 } 307 308 inet->rcv_saddr = inet->saddr = v4addr; 309 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 310 if (!(addr_type & IPV6_ADDR_MULTICAST)) 311 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 312 err = 0; 313 out: 314 release_sock(sk); 315 return err; 316 } 317 318 void rawv6_err(struct sock *sk, struct sk_buff *skb, 319 struct inet6_skb_parm *opt, 320 int type, int code, int offset, __be32 info) 321 { 322 struct inet_sock *inet = inet_sk(sk); 323 struct ipv6_pinfo *np = inet6_sk(sk); 324 int err; 325 int harderr; 326 327 /* Report error on raw socket, if: 328 1. User requested recverr. 329 2. Socket is connected (otherwise the error indication 330 is useless without recverr and error is hard. 331 */ 332 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 333 return; 334 335 harderr = icmpv6_err_convert(type, code, &err); 336 if (type == ICMPV6_PKT_TOOBIG) 337 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 338 339 if (np->recverr) { 340 u8 *payload = skb->data; 341 if (!inet->hdrincl) 342 payload += offset; 343 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 344 } 345 346 if (np->recverr || harderr) { 347 sk->sk_err = err; 348 sk->sk_error_report(sk); 349 } 350 } 351 352 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 353 { 354 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 355 skb_checksum_complete(skb)) { 356 /* FIXME: increment a raw6 drops counter here */ 357 kfree_skb(skb); 358 return 0; 359 } 360 361 /* Charge it to the socket. */ 362 if (sock_queue_rcv_skb(sk,skb)<0) { 363 /* FIXME: increment a raw6 drops counter here */ 364 kfree_skb(skb); 365 return 0; 366 } 367 368 return 0; 369 } 370 371 /* 372 * This is next to useless... 373 * if we demultiplex in network layer we don't need the extra call 374 * just to queue the skb... 375 * maybe we could have the network decide upon a hint if it 376 * should call raw_rcv for demultiplexing 377 */ 378 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 379 { 380 struct inet_sock *inet = inet_sk(sk); 381 struct raw6_sock *rp = raw6_sk(sk); 382 383 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 384 kfree_skb(skb); 385 return NET_RX_DROP; 386 } 387 388 if (!rp->checksum) 389 skb->ip_summed = CHECKSUM_UNNECESSARY; 390 391 if (skb->ip_summed == CHECKSUM_COMPLETE) { 392 skb_postpull_rcsum(skb, skb_network_header(skb), 393 skb_network_header_len(skb)); 394 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 395 &ipv6_hdr(skb)->daddr, 396 skb->len, inet->num, skb->csum)) 397 skb->ip_summed = CHECKSUM_UNNECESSARY; 398 } 399 if (!skb_csum_unnecessary(skb)) 400 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 401 &ipv6_hdr(skb)->daddr, 402 skb->len, 403 inet->num, 0)); 404 405 if (inet->hdrincl) { 406 if (skb_checksum_complete(skb)) { 407 /* FIXME: increment a raw6 drops counter here */ 408 kfree_skb(skb); 409 return 0; 410 } 411 } 412 413 rawv6_rcv_skb(sk, skb); 414 return 0; 415 } 416 417 418 /* 419 * This should be easy, if there is something there 420 * we return it, otherwise we block. 421 */ 422 423 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 424 struct msghdr *msg, size_t len, 425 int noblock, int flags, int *addr_len) 426 { 427 struct ipv6_pinfo *np = inet6_sk(sk); 428 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 429 struct sk_buff *skb; 430 size_t copied; 431 int err; 432 433 if (flags & MSG_OOB) 434 return -EOPNOTSUPP; 435 436 if (addr_len) 437 *addr_len=sizeof(*sin6); 438 439 if (flags & MSG_ERRQUEUE) 440 return ipv6_recv_error(sk, msg, len); 441 442 skb = skb_recv_datagram(sk, flags, noblock, &err); 443 if (!skb) 444 goto out; 445 446 copied = skb->len; 447 if (copied > len) { 448 copied = len; 449 msg->msg_flags |= MSG_TRUNC; 450 } 451 452 if (skb_csum_unnecessary(skb)) { 453 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 454 } else if (msg->msg_flags&MSG_TRUNC) { 455 if (__skb_checksum_complete(skb)) 456 goto csum_copy_err; 457 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 458 } else { 459 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 460 if (err == -EINVAL) 461 goto csum_copy_err; 462 } 463 if (err) 464 goto out_free; 465 466 /* Copy the address. */ 467 if (sin6) { 468 sin6->sin6_family = AF_INET6; 469 sin6->sin6_port = 0; 470 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 471 sin6->sin6_flowinfo = 0; 472 sin6->sin6_scope_id = 0; 473 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 474 sin6->sin6_scope_id = IP6CB(skb)->iif; 475 } 476 477 sock_recv_timestamp(msg, sk, skb); 478 479 if (np->rxopt.all) 480 datagram_recv_ctl(sk, msg, skb); 481 482 err = copied; 483 if (flags & MSG_TRUNC) 484 err = skb->len; 485 486 out_free: 487 skb_free_datagram(sk, skb); 488 out: 489 return err; 490 491 csum_copy_err: 492 skb_kill_datagram(sk, skb, flags); 493 494 /* Error for blocking case is chosen to masquerade 495 as some normal condition. 496 */ 497 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 498 /* FIXME: increment a raw6 drops counter here */ 499 goto out; 500 } 501 502 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 503 struct raw6_sock *rp) 504 { 505 struct sk_buff *skb; 506 int err = 0; 507 int offset; 508 int len; 509 int total_len; 510 __wsum tmp_csum; 511 __sum16 csum; 512 513 if (!rp->checksum) 514 goto send; 515 516 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 517 goto out; 518 519 offset = rp->offset; 520 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) - 521 skb->data); 522 if (offset >= total_len - 1) { 523 err = -EINVAL; 524 ip6_flush_pending_frames(sk); 525 goto out; 526 } 527 528 /* should be check HW csum miyazawa */ 529 if (skb_queue_len(&sk->sk_write_queue) == 1) { 530 /* 531 * Only one fragment on the socket. 532 */ 533 tmp_csum = skb->csum; 534 } else { 535 struct sk_buff *csum_skb = NULL; 536 tmp_csum = 0; 537 538 skb_queue_walk(&sk->sk_write_queue, skb) { 539 tmp_csum = csum_add(tmp_csum, skb->csum); 540 541 if (csum_skb) 542 continue; 543 544 len = skb->len - skb_transport_offset(skb); 545 if (offset >= len) { 546 offset -= len; 547 continue; 548 } 549 550 csum_skb = skb; 551 } 552 553 skb = csum_skb; 554 } 555 556 offset += skb_transport_offset(skb); 557 if (skb_copy_bits(skb, offset, &csum, 2)) 558 BUG(); 559 560 /* in case cksum was not initialized */ 561 if (unlikely(csum)) 562 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 563 564 csum = csum_ipv6_magic(&fl->fl6_src, 565 &fl->fl6_dst, 566 total_len, fl->proto, tmp_csum); 567 568 if (csum == 0 && fl->proto == IPPROTO_UDP) 569 csum = CSUM_MANGLED_0; 570 571 if (skb_store_bits(skb, offset, &csum, 2)) 572 BUG(); 573 574 send: 575 err = ip6_push_pending_frames(sk); 576 out: 577 return err; 578 } 579 580 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 581 struct flowi *fl, struct rt6_info *rt, 582 unsigned int flags) 583 { 584 struct ipv6_pinfo *np = inet6_sk(sk); 585 struct ipv6hdr *iph; 586 struct sk_buff *skb; 587 unsigned int hh_len; 588 int err; 589 590 if (length > rt->u.dst.dev->mtu) { 591 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 592 return -EMSGSIZE; 593 } 594 if (flags&MSG_PROBE) 595 goto out; 596 597 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 598 599 skb = sock_alloc_send_skb(sk, length+hh_len+15, 600 flags&MSG_DONTWAIT, &err); 601 if (skb == NULL) 602 goto error; 603 skb_reserve(skb, hh_len); 604 605 skb->priority = sk->sk_priority; 606 skb->dst = dst_clone(&rt->u.dst); 607 608 skb_put(skb, length); 609 skb_reset_network_header(skb); 610 iph = ipv6_hdr(skb); 611 612 skb->ip_summed = CHECKSUM_NONE; 613 614 skb->transport_header = skb->network_header; 615 err = memcpy_fromiovecend((void *)iph, from, 0, length); 616 if (err) 617 goto error_fault; 618 619 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); 620 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 621 dst_output); 622 if (err > 0) 623 err = np->recverr ? net_xmit_errno(err) : 0; 624 if (err) 625 goto error; 626 out: 627 return 0; 628 629 error_fault: 630 err = -EFAULT; 631 kfree_skb(skb); 632 error: 633 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 634 return err; 635 } 636 637 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 638 { 639 struct iovec *iov; 640 u8 __user *type = NULL; 641 u8 __user *code = NULL; 642 u8 len = 0; 643 int probed = 0; 644 int i; 645 646 if (!msg->msg_iov) 647 return 0; 648 649 for (i = 0; i < msg->msg_iovlen; i++) { 650 iov = &msg->msg_iov[i]; 651 if (!iov) 652 continue; 653 654 switch (fl->proto) { 655 case IPPROTO_ICMPV6: 656 /* check if one-byte field is readable or not. */ 657 if (iov->iov_base && iov->iov_len < 1) 658 break; 659 660 if (!type) { 661 type = iov->iov_base; 662 /* check if code field is readable or not. */ 663 if (iov->iov_len > 1) 664 code = type + 1; 665 } else if (!code) 666 code = iov->iov_base; 667 668 if (type && code) { 669 if (get_user(fl->fl_icmp_type, type) || 670 get_user(fl->fl_icmp_code, code)) 671 return -EFAULT; 672 probed = 1; 673 } 674 break; 675 case IPPROTO_MH: 676 if (iov->iov_base && iov->iov_len < 1) 677 break; 678 /* check if type field is readable or not. */ 679 if (iov->iov_len > 2 - len) { 680 u8 __user *p = iov->iov_base; 681 if (get_user(fl->fl_mh_type, &p[2 - len])) 682 return -EFAULT; 683 probed = 1; 684 } else 685 len += iov->iov_len; 686 687 break; 688 default: 689 probed = 1; 690 break; 691 } 692 if (probed) 693 break; 694 } 695 return 0; 696 } 697 698 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 699 struct msghdr *msg, size_t len) 700 { 701 struct ipv6_txoptions opt_space; 702 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 703 struct in6_addr *daddr, *final_p = NULL, final; 704 struct inet_sock *inet = inet_sk(sk); 705 struct ipv6_pinfo *np = inet6_sk(sk); 706 struct raw6_sock *rp = raw6_sk(sk); 707 struct ipv6_txoptions *opt = NULL; 708 struct ip6_flowlabel *flowlabel = NULL; 709 struct dst_entry *dst = NULL; 710 struct flowi fl; 711 int addr_len = msg->msg_namelen; 712 int hlimit = -1; 713 int tclass = -1; 714 u16 proto; 715 int err; 716 717 /* Rough check on arithmetic overflow, 718 better check is made in ip6_append_data(). 719 */ 720 if (len > INT_MAX) 721 return -EMSGSIZE; 722 723 /* Mirror BSD error message compatibility */ 724 if (msg->msg_flags & MSG_OOB) 725 return -EOPNOTSUPP; 726 727 /* 728 * Get and verify the address. 729 */ 730 memset(&fl, 0, sizeof(fl)); 731 732 if (sin6) { 733 if (addr_len < SIN6_LEN_RFC2133) 734 return -EINVAL; 735 736 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 737 return(-EAFNOSUPPORT); 738 739 /* port is the proto value [0..255] carried in nexthdr */ 740 proto = ntohs(sin6->sin6_port); 741 742 if (!proto) 743 proto = inet->num; 744 else if (proto != inet->num) 745 return(-EINVAL); 746 747 if (proto > 255) 748 return(-EINVAL); 749 750 daddr = &sin6->sin6_addr; 751 if (np->sndflow) { 752 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 753 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 754 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 755 if (flowlabel == NULL) 756 return -EINVAL; 757 daddr = &flowlabel->dst; 758 } 759 } 760 761 /* 762 * Otherwise it will be difficult to maintain 763 * sk->sk_dst_cache. 764 */ 765 if (sk->sk_state == TCP_ESTABLISHED && 766 ipv6_addr_equal(daddr, &np->daddr)) 767 daddr = &np->daddr; 768 769 if (addr_len >= sizeof(struct sockaddr_in6) && 770 sin6->sin6_scope_id && 771 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 772 fl.oif = sin6->sin6_scope_id; 773 } else { 774 if (sk->sk_state != TCP_ESTABLISHED) 775 return -EDESTADDRREQ; 776 777 proto = inet->num; 778 daddr = &np->daddr; 779 fl.fl6_flowlabel = np->flow_label; 780 } 781 782 if (ipv6_addr_any(daddr)) { 783 /* 784 * unspecified destination address 785 * treated as error... is this correct ? 786 */ 787 fl6_sock_release(flowlabel); 788 return(-EINVAL); 789 } 790 791 if (fl.oif == 0) 792 fl.oif = sk->sk_bound_dev_if; 793 794 if (msg->msg_controllen) { 795 opt = &opt_space; 796 memset(opt, 0, sizeof(struct ipv6_txoptions)); 797 opt->tot_len = sizeof(struct ipv6_txoptions); 798 799 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass); 800 if (err < 0) { 801 fl6_sock_release(flowlabel); 802 return err; 803 } 804 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 805 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 806 if (flowlabel == NULL) 807 return -EINVAL; 808 } 809 if (!(opt->opt_nflen|opt->opt_flen)) 810 opt = NULL; 811 } 812 if (opt == NULL) 813 opt = np->opt; 814 if (flowlabel) 815 opt = fl6_merge_options(&opt_space, flowlabel, opt); 816 opt = ipv6_fixup_options(&opt_space, opt); 817 818 fl.proto = proto; 819 err = rawv6_probe_proto_opt(&fl, msg); 820 if (err) 821 goto out; 822 823 ipv6_addr_copy(&fl.fl6_dst, daddr); 824 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 825 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 826 827 /* merge ip6_build_xmit from ip6_output */ 828 if (opt && opt->srcrt) { 829 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 830 ipv6_addr_copy(&final, &fl.fl6_dst); 831 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 832 final_p = &final; 833 } 834 835 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 836 fl.oif = np->mcast_oif; 837 security_sk_classify_flow(sk, &fl); 838 839 err = ip6_dst_lookup(sk, &dst, &fl); 840 if (err) 841 goto out; 842 if (final_p) 843 ipv6_addr_copy(&fl.fl6_dst, final_p); 844 845 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) { 846 if (err == -EREMOTE) 847 err = ip6_dst_blackhole(sk, &dst, &fl); 848 if (err < 0) 849 goto out; 850 } 851 852 if (hlimit < 0) { 853 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 854 hlimit = np->mcast_hops; 855 else 856 hlimit = np->hop_limit; 857 if (hlimit < 0) 858 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 859 if (hlimit < 0) 860 hlimit = ipv6_get_hoplimit(dst->dev); 861 } 862 863 if (tclass < 0) { 864 tclass = np->tclass; 865 if (tclass < 0) 866 tclass = 0; 867 } 868 869 if (msg->msg_flags&MSG_CONFIRM) 870 goto do_confirm; 871 872 back_from_confirm: 873 if (inet->hdrincl) { 874 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 875 } else { 876 lock_sock(sk); 877 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 878 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 879 msg->msg_flags); 880 881 if (err) 882 ip6_flush_pending_frames(sk); 883 else if (!(msg->msg_flags & MSG_MORE)) 884 err = rawv6_push_pending_frames(sk, &fl, rp); 885 } 886 done: 887 dst_release(dst); 888 if (!inet->hdrincl) 889 release_sock(sk); 890 out: 891 fl6_sock_release(flowlabel); 892 return err<0?err:len; 893 do_confirm: 894 dst_confirm(dst); 895 if (!(msg->msg_flags & MSG_PROBE) || len) 896 goto back_from_confirm; 897 err = 0; 898 goto done; 899 } 900 901 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 902 char __user *optval, int optlen) 903 { 904 switch (optname) { 905 case ICMPV6_FILTER: 906 if (optlen > sizeof(struct icmp6_filter)) 907 optlen = sizeof(struct icmp6_filter); 908 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 909 return -EFAULT; 910 return 0; 911 default: 912 return -ENOPROTOOPT; 913 } 914 915 return 0; 916 } 917 918 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 919 char __user *optval, int __user *optlen) 920 { 921 int len; 922 923 switch (optname) { 924 case ICMPV6_FILTER: 925 if (get_user(len, optlen)) 926 return -EFAULT; 927 if (len < 0) 928 return -EINVAL; 929 if (len > sizeof(struct icmp6_filter)) 930 len = sizeof(struct icmp6_filter); 931 if (put_user(len, optlen)) 932 return -EFAULT; 933 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 934 return -EFAULT; 935 return 0; 936 default: 937 return -ENOPROTOOPT; 938 } 939 940 return 0; 941 } 942 943 944 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 945 char __user *optval, int optlen) 946 { 947 struct raw6_sock *rp = raw6_sk(sk); 948 int val; 949 950 if (get_user(val, (int __user *)optval)) 951 return -EFAULT; 952 953 switch (optname) { 954 case IPV6_CHECKSUM: 955 /* You may get strange result with a positive odd offset; 956 RFC2292bis agrees with me. */ 957 if (val > 0 && (val&1)) 958 return(-EINVAL); 959 if (val < 0) { 960 rp->checksum = 0; 961 } else { 962 rp->checksum = 1; 963 rp->offset = val; 964 } 965 966 return 0; 967 break; 968 969 default: 970 return(-ENOPROTOOPT); 971 } 972 } 973 974 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 975 char __user *optval, int optlen) 976 { 977 switch(level) { 978 case SOL_RAW: 979 break; 980 981 case SOL_ICMPV6: 982 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 983 return -EOPNOTSUPP; 984 return rawv6_seticmpfilter(sk, level, optname, optval, 985 optlen); 986 case SOL_IPV6: 987 if (optname == IPV6_CHECKSUM) 988 break; 989 default: 990 return ipv6_setsockopt(sk, level, optname, optval, 991 optlen); 992 } 993 994 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 995 } 996 997 #ifdef CONFIG_COMPAT 998 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 999 char __user *optval, int optlen) 1000 { 1001 switch (level) { 1002 case SOL_RAW: 1003 break; 1004 case SOL_ICMPV6: 1005 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1006 return -EOPNOTSUPP; 1007 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1008 case SOL_IPV6: 1009 if (optname == IPV6_CHECKSUM) 1010 break; 1011 default: 1012 return compat_ipv6_setsockopt(sk, level, optname, 1013 optval, optlen); 1014 } 1015 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1016 } 1017 #endif 1018 1019 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1020 char __user *optval, int __user *optlen) 1021 { 1022 struct raw6_sock *rp = raw6_sk(sk); 1023 int val, len; 1024 1025 if (get_user(len,optlen)) 1026 return -EFAULT; 1027 1028 switch (optname) { 1029 case IPV6_CHECKSUM: 1030 if (rp->checksum == 0) 1031 val = -1; 1032 else 1033 val = rp->offset; 1034 break; 1035 1036 default: 1037 return -ENOPROTOOPT; 1038 } 1039 1040 len = min_t(unsigned int, sizeof(int), len); 1041 1042 if (put_user(len, optlen)) 1043 return -EFAULT; 1044 if (copy_to_user(optval,&val,len)) 1045 return -EFAULT; 1046 return 0; 1047 } 1048 1049 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1050 char __user *optval, int __user *optlen) 1051 { 1052 switch(level) { 1053 case SOL_RAW: 1054 break; 1055 1056 case SOL_ICMPV6: 1057 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1058 return -EOPNOTSUPP; 1059 return rawv6_geticmpfilter(sk, level, optname, optval, 1060 optlen); 1061 case SOL_IPV6: 1062 if (optname == IPV6_CHECKSUM) 1063 break; 1064 default: 1065 return ipv6_getsockopt(sk, level, optname, optval, 1066 optlen); 1067 } 1068 1069 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1070 } 1071 1072 #ifdef CONFIG_COMPAT 1073 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1074 char __user *optval, int __user *optlen) 1075 { 1076 switch (level) { 1077 case SOL_RAW: 1078 break; 1079 case SOL_ICMPV6: 1080 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1081 return -EOPNOTSUPP; 1082 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1083 case SOL_IPV6: 1084 if (optname == IPV6_CHECKSUM) 1085 break; 1086 default: 1087 return compat_ipv6_getsockopt(sk, level, optname, 1088 optval, optlen); 1089 } 1090 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1091 } 1092 #endif 1093 1094 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1095 { 1096 switch(cmd) { 1097 case SIOCOUTQ: 1098 { 1099 int amount = atomic_read(&sk->sk_wmem_alloc); 1100 return put_user(amount, (int __user *)arg); 1101 } 1102 case SIOCINQ: 1103 { 1104 struct sk_buff *skb; 1105 int amount = 0; 1106 1107 spin_lock_bh(&sk->sk_receive_queue.lock); 1108 skb = skb_peek(&sk->sk_receive_queue); 1109 if (skb != NULL) 1110 amount = skb->tail - skb->transport_header; 1111 spin_unlock_bh(&sk->sk_receive_queue.lock); 1112 return put_user(amount, (int __user *)arg); 1113 } 1114 1115 default: 1116 return -ENOIOCTLCMD; 1117 } 1118 } 1119 1120 static void rawv6_close(struct sock *sk, long timeout) 1121 { 1122 if (inet_sk(sk)->num == IPPROTO_RAW) 1123 ip6_ra_control(sk, -1, NULL); 1124 1125 sk_common_release(sk); 1126 } 1127 1128 static int rawv6_init_sk(struct sock *sk) 1129 { 1130 struct raw6_sock *rp = raw6_sk(sk); 1131 1132 switch (inet_sk(sk)->num) { 1133 case IPPROTO_ICMPV6: 1134 rp->checksum = 1; 1135 rp->offset = 2; 1136 break; 1137 case IPPROTO_MH: 1138 rp->checksum = 1; 1139 rp->offset = 4; 1140 break; 1141 default: 1142 break; 1143 } 1144 return(0); 1145 } 1146 1147 struct proto rawv6_prot = { 1148 .name = "RAWv6", 1149 .owner = THIS_MODULE, 1150 .close = rawv6_close, 1151 .connect = ip6_datagram_connect, 1152 .disconnect = udp_disconnect, 1153 .ioctl = rawv6_ioctl, 1154 .init = rawv6_init_sk, 1155 .destroy = inet6_destroy_sock, 1156 .setsockopt = rawv6_setsockopt, 1157 .getsockopt = rawv6_getsockopt, 1158 .sendmsg = rawv6_sendmsg, 1159 .recvmsg = rawv6_recvmsg, 1160 .bind = rawv6_bind, 1161 .backlog_rcv = rawv6_rcv_skb, 1162 .hash = raw_v6_hash, 1163 .unhash = raw_v6_unhash, 1164 .obj_size = sizeof(struct raw6_sock), 1165 #ifdef CONFIG_COMPAT 1166 .compat_setsockopt = compat_rawv6_setsockopt, 1167 .compat_getsockopt = compat_rawv6_getsockopt, 1168 #endif 1169 }; 1170 1171 #ifdef CONFIG_PROC_FS 1172 struct raw6_iter_state { 1173 int bucket; 1174 }; 1175 1176 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private) 1177 1178 static struct sock *raw6_get_first(struct seq_file *seq) 1179 { 1180 struct sock *sk; 1181 struct hlist_node *node; 1182 struct raw6_iter_state* state = raw6_seq_private(seq); 1183 1184 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket) 1185 sk_for_each(sk, node, &raw_v6_htable[state->bucket]) 1186 if (sk->sk_family == PF_INET6) 1187 goto out; 1188 sk = NULL; 1189 out: 1190 return sk; 1191 } 1192 1193 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk) 1194 { 1195 struct raw6_iter_state* state = raw6_seq_private(seq); 1196 1197 do { 1198 sk = sk_next(sk); 1199 try_again: 1200 ; 1201 } while (sk && sk->sk_family != PF_INET6); 1202 1203 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) { 1204 sk = sk_head(&raw_v6_htable[state->bucket]); 1205 goto try_again; 1206 } 1207 return sk; 1208 } 1209 1210 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos) 1211 { 1212 struct sock *sk = raw6_get_first(seq); 1213 if (sk) 1214 while (pos && (sk = raw6_get_next(seq, sk)) != NULL) 1215 --pos; 1216 return pos ? NULL : sk; 1217 } 1218 1219 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos) 1220 { 1221 read_lock(&raw_v6_lock); 1222 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1223 } 1224 1225 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1226 { 1227 struct sock *sk; 1228 1229 if (v == SEQ_START_TOKEN) 1230 sk = raw6_get_first(seq); 1231 else 1232 sk = raw6_get_next(seq, v); 1233 ++*pos; 1234 return sk; 1235 } 1236 1237 static void raw6_seq_stop(struct seq_file *seq, void *v) 1238 { 1239 read_unlock(&raw_v6_lock); 1240 } 1241 1242 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1243 { 1244 struct ipv6_pinfo *np = inet6_sk(sp); 1245 struct in6_addr *dest, *src; 1246 __u16 destp, srcp; 1247 1248 dest = &np->daddr; 1249 src = &np->rcv_saddr; 1250 destp = 0; 1251 srcp = inet_sk(sp)->num; 1252 seq_printf(seq, 1253 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1254 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1255 i, 1256 src->s6_addr32[0], src->s6_addr32[1], 1257 src->s6_addr32[2], src->s6_addr32[3], srcp, 1258 dest->s6_addr32[0], dest->s6_addr32[1], 1259 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1260 sp->sk_state, 1261 atomic_read(&sp->sk_wmem_alloc), 1262 atomic_read(&sp->sk_rmem_alloc), 1263 0, 0L, 0, 1264 sock_i_uid(sp), 0, 1265 sock_i_ino(sp), 1266 atomic_read(&sp->sk_refcnt), sp); 1267 } 1268 1269 static int raw6_seq_show(struct seq_file *seq, void *v) 1270 { 1271 if (v == SEQ_START_TOKEN) 1272 seq_printf(seq, 1273 " sl " 1274 "local_address " 1275 "remote_address " 1276 "st tx_queue rx_queue tr tm->when retrnsmt" 1277 " uid timeout inode\n"); 1278 else 1279 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket); 1280 return 0; 1281 } 1282 1283 static const struct seq_operations raw6_seq_ops = { 1284 .start = raw6_seq_start, 1285 .next = raw6_seq_next, 1286 .stop = raw6_seq_stop, 1287 .show = raw6_seq_show, 1288 }; 1289 1290 static int raw6_seq_open(struct inode *inode, struct file *file) 1291 { 1292 struct seq_file *seq; 1293 int rc = -ENOMEM; 1294 struct raw6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 1295 if (!s) 1296 goto out; 1297 rc = seq_open(file, &raw6_seq_ops); 1298 if (rc) 1299 goto out_kfree; 1300 seq = file->private_data; 1301 seq->private = s; 1302 out: 1303 return rc; 1304 out_kfree: 1305 kfree(s); 1306 goto out; 1307 } 1308 1309 static const struct file_operations raw6_seq_fops = { 1310 .owner = THIS_MODULE, 1311 .open = raw6_seq_open, 1312 .read = seq_read, 1313 .llseek = seq_lseek, 1314 .release = seq_release_private, 1315 }; 1316 1317 int __init raw6_proc_init(void) 1318 { 1319 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops)) 1320 return -ENOMEM; 1321 return 0; 1322 } 1323 1324 void raw6_proc_exit(void) 1325 { 1326 proc_net_remove("raw6"); 1327 } 1328 #endif /* CONFIG_PROC_FS */ 1329