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 53 #include <net/rawv6.h> 54 #include <net/xfrm.h> 55 56 #include <linux/proc_fs.h> 57 #include <linux/seq_file.h> 58 59 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE]; 60 DEFINE_RWLOCK(raw_v6_lock); 61 62 static void raw_v6_hash(struct sock *sk) 63 { 64 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num & 65 (RAWV6_HTABLE_SIZE - 1)]; 66 67 write_lock_bh(&raw_v6_lock); 68 sk_add_node(sk, list); 69 sock_prot_inc_use(sk->sk_prot); 70 write_unlock_bh(&raw_v6_lock); 71 } 72 73 static void raw_v6_unhash(struct sock *sk) 74 { 75 write_lock_bh(&raw_v6_lock); 76 if (sk_del_node_init(sk)) 77 sock_prot_dec_use(sk->sk_prot); 78 write_unlock_bh(&raw_v6_lock); 79 } 80 81 82 /* Grumble... icmp and ip_input want to get at this... */ 83 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num, 84 struct in6_addr *loc_addr, struct in6_addr *rmt_addr) 85 { 86 struct hlist_node *node; 87 int is_multicast = ipv6_addr_is_multicast(loc_addr); 88 89 sk_for_each_from(sk, node) 90 if (inet_sk(sk)->num == num) { 91 struct ipv6_pinfo *np = inet6_sk(sk); 92 93 if (!ipv6_addr_any(&np->daddr) && 94 !ipv6_addr_equal(&np->daddr, rmt_addr)) 95 continue; 96 97 if (!ipv6_addr_any(&np->rcv_saddr)) { 98 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 99 goto found; 100 if (is_multicast && 101 inet6_mc_check(sk, loc_addr, rmt_addr)) 102 goto found; 103 continue; 104 } 105 goto found; 106 } 107 sk = NULL; 108 found: 109 return sk; 110 } 111 112 /* 113 * 0 - deliver 114 * 1 - block 115 */ 116 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 117 { 118 struct icmp6hdr *icmph; 119 struct raw6_sock *rp = raw6_sk(sk); 120 121 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 122 __u32 *data = &rp->filter.data[0]; 123 int bit_nr; 124 125 icmph = (struct icmp6hdr *) skb->data; 126 bit_nr = icmph->icmp6_type; 127 128 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 129 } 130 return 0; 131 } 132 133 /* 134 * demultiplex raw sockets. 135 * (should consider queueing the skb in the sock receive_queue 136 * without calling rawv6.c) 137 * 138 * Caller owns SKB so we must make clones. 139 */ 140 void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 141 { 142 struct in6_addr *saddr; 143 struct in6_addr *daddr; 144 struct sock *sk; 145 __u8 hash; 146 147 saddr = &skb->nh.ipv6h->saddr; 148 daddr = saddr + 1; 149 150 hash = nexthdr & (MAX_INET_PROTOS - 1); 151 152 read_lock(&raw_v6_lock); 153 sk = sk_head(&raw_v6_htable[hash]); 154 155 /* 156 * The first socket found will be delivered after 157 * delivery to transport protocols. 158 */ 159 160 if (sk == NULL) 161 goto out; 162 163 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr); 164 165 while (sk) { 166 if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) { 167 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 168 169 /* Not releasing hash table! */ 170 if (clone) 171 rawv6_rcv(sk, clone); 172 } 173 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr); 174 } 175 out: 176 read_unlock(&raw_v6_lock); 177 } 178 179 /* This cleans up af_inet6 a bit. -DaveM */ 180 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 181 { 182 struct inet_sock *inet = inet_sk(sk); 183 struct ipv6_pinfo *np = inet6_sk(sk); 184 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 185 __u32 v4addr = 0; 186 int addr_type; 187 int err; 188 189 if (addr_len < SIN6_LEN_RFC2133) 190 return -EINVAL; 191 addr_type = ipv6_addr_type(&addr->sin6_addr); 192 193 /* Raw sockets are IPv6 only */ 194 if (addr_type == IPV6_ADDR_MAPPED) 195 return(-EADDRNOTAVAIL); 196 197 lock_sock(sk); 198 199 err = -EINVAL; 200 if (sk->sk_state != TCP_CLOSE) 201 goto out; 202 203 /* Check if the address belongs to the host. */ 204 if (addr_type != IPV6_ADDR_ANY) { 205 struct net_device *dev = NULL; 206 207 if (addr_type & IPV6_ADDR_LINKLOCAL) { 208 if (addr_len >= sizeof(struct sockaddr_in6) && 209 addr->sin6_scope_id) { 210 /* Override any existing binding, if another 211 * one is supplied by user. 212 */ 213 sk->sk_bound_dev_if = addr->sin6_scope_id; 214 } 215 216 /* Binding to link-local address requires an interface */ 217 if (!sk->sk_bound_dev_if) 218 goto out; 219 220 dev = dev_get_by_index(sk->sk_bound_dev_if); 221 if (!dev) { 222 err = -ENODEV; 223 goto out; 224 } 225 } 226 227 /* ipv4 addr of the socket is invalid. Only the 228 * unspecified and mapped address have a v4 equivalent. 229 */ 230 v4addr = LOOPBACK4_IPV6; 231 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 232 err = -EADDRNOTAVAIL; 233 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 234 if (dev) 235 dev_put(dev); 236 goto out; 237 } 238 } 239 if (dev) 240 dev_put(dev); 241 } 242 243 inet->rcv_saddr = inet->saddr = v4addr; 244 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 245 if (!(addr_type & IPV6_ADDR_MULTICAST)) 246 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 247 err = 0; 248 out: 249 release_sock(sk); 250 return err; 251 } 252 253 void rawv6_err(struct sock *sk, struct sk_buff *skb, 254 struct inet6_skb_parm *opt, 255 int type, int code, int offset, u32 info) 256 { 257 struct inet_sock *inet = inet_sk(sk); 258 struct ipv6_pinfo *np = inet6_sk(sk); 259 int err; 260 int harderr; 261 262 /* Report error on raw socket, if: 263 1. User requested recverr. 264 2. Socket is connected (otherwise the error indication 265 is useless without recverr and error is hard. 266 */ 267 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 268 return; 269 270 harderr = icmpv6_err_convert(type, code, &err); 271 if (type == ICMPV6_PKT_TOOBIG) 272 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 273 274 if (np->recverr) { 275 u8 *payload = skb->data; 276 if (!inet->hdrincl) 277 payload += offset; 278 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 279 } 280 281 if (np->recverr || harderr) { 282 sk->sk_err = err; 283 sk->sk_error_report(sk); 284 } 285 } 286 287 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 288 { 289 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 290 skb->ip_summed != CHECKSUM_UNNECESSARY) { 291 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { 292 /* FIXME: increment a raw6 drops counter here */ 293 kfree_skb(skb); 294 return 0; 295 } 296 skb->ip_summed = CHECKSUM_UNNECESSARY; 297 } 298 299 /* Charge it to the socket. */ 300 if (sock_queue_rcv_skb(sk,skb)<0) { 301 /* FIXME: increment a raw6 drops counter here */ 302 kfree_skb(skb); 303 return 0; 304 } 305 306 return 0; 307 } 308 309 /* 310 * This is next to useless... 311 * if we demultiplex in network layer we don't need the extra call 312 * just to queue the skb... 313 * maybe we could have the network decide upon a hint if it 314 * should call raw_rcv for demultiplexing 315 */ 316 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 317 { 318 struct inet_sock *inet = inet_sk(sk); 319 struct raw6_sock *rp = raw6_sk(sk); 320 321 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 322 kfree_skb(skb); 323 return NET_RX_DROP; 324 } 325 326 if (!rp->checksum) 327 skb->ip_summed = CHECKSUM_UNNECESSARY; 328 329 if (skb->ip_summed != CHECKSUM_UNNECESSARY) { 330 if (skb->ip_summed == CHECKSUM_HW) { 331 skb->ip_summed = CHECKSUM_UNNECESSARY; 332 if (csum_ipv6_magic(&skb->nh.ipv6h->saddr, 333 &skb->nh.ipv6h->daddr, 334 skb->len, inet->num, skb->csum)) { 335 LIMIT_NETDEBUG( 336 printk(KERN_DEBUG "raw v6 hw csum failure.\n")); 337 skb->ip_summed = CHECKSUM_NONE; 338 } 339 } 340 if (skb->ip_summed == CHECKSUM_NONE) 341 skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr, 342 &skb->nh.ipv6h->daddr, 343 skb->len, inet->num, 0); 344 } 345 346 if (inet->hdrincl) { 347 if (skb->ip_summed != CHECKSUM_UNNECESSARY && 348 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { 349 /* FIXME: increment a raw6 drops counter here */ 350 kfree_skb(skb); 351 return 0; 352 } 353 skb->ip_summed = CHECKSUM_UNNECESSARY; 354 } 355 356 rawv6_rcv_skb(sk, skb); 357 return 0; 358 } 359 360 361 /* 362 * This should be easy, if there is something there 363 * we return it, otherwise we block. 364 */ 365 366 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 367 struct msghdr *msg, size_t len, 368 int noblock, int flags, int *addr_len) 369 { 370 struct ipv6_pinfo *np = inet6_sk(sk); 371 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 372 struct sk_buff *skb; 373 size_t copied; 374 int err; 375 376 if (flags & MSG_OOB) 377 return -EOPNOTSUPP; 378 379 if (addr_len) 380 *addr_len=sizeof(*sin6); 381 382 if (flags & MSG_ERRQUEUE) 383 return ipv6_recv_error(sk, msg, len); 384 385 skb = skb_recv_datagram(sk, flags, noblock, &err); 386 if (!skb) 387 goto out; 388 389 copied = skb->len; 390 if (copied > len) { 391 copied = len; 392 msg->msg_flags |= MSG_TRUNC; 393 } 394 395 if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 396 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 397 } else if (msg->msg_flags&MSG_TRUNC) { 398 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) 399 goto csum_copy_err; 400 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 401 } else { 402 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 403 if (err == -EINVAL) 404 goto csum_copy_err; 405 } 406 if (err) 407 goto out_free; 408 409 /* Copy the address. */ 410 if (sin6) { 411 sin6->sin6_family = AF_INET6; 412 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 413 sin6->sin6_flowinfo = 0; 414 sin6->sin6_scope_id = 0; 415 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 416 sin6->sin6_scope_id = IP6CB(skb)->iif; 417 } 418 419 sock_recv_timestamp(msg, sk, skb); 420 421 if (np->rxopt.all) 422 datagram_recv_ctl(sk, msg, skb); 423 424 err = copied; 425 if (flags & MSG_TRUNC) 426 err = skb->len; 427 428 out_free: 429 skb_free_datagram(sk, skb); 430 out: 431 return err; 432 433 csum_copy_err: 434 /* Clear queue. */ 435 if (flags&MSG_PEEK) { 436 int clear = 0; 437 spin_lock_bh(&sk->sk_receive_queue.lock); 438 if (skb == skb_peek(&sk->sk_receive_queue)) { 439 __skb_unlink(skb, &sk->sk_receive_queue); 440 clear = 1; 441 } 442 spin_unlock_bh(&sk->sk_receive_queue.lock); 443 if (clear) 444 kfree_skb(skb); 445 } 446 447 /* Error for blocking case is chosen to masquerade 448 as some normal condition. 449 */ 450 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 451 /* FIXME: increment a raw6 drops counter here */ 452 goto out_free; 453 } 454 455 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 456 struct raw6_sock *rp) 457 { 458 struct sk_buff *skb; 459 int err = 0; 460 int offset; 461 int len; 462 int total_len; 463 u32 tmp_csum; 464 u16 csum; 465 466 if (!rp->checksum) 467 goto send; 468 469 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 470 goto out; 471 472 offset = rp->offset; 473 total_len = inet_sk(sk)->cork.length - (skb->nh.raw - skb->data); 474 if (offset >= total_len - 1) { 475 err = -EINVAL; 476 ip6_flush_pending_frames(sk); 477 goto out; 478 } 479 480 /* should be check HW csum miyazawa */ 481 if (skb_queue_len(&sk->sk_write_queue) == 1) { 482 /* 483 * Only one fragment on the socket. 484 */ 485 tmp_csum = skb->csum; 486 } else { 487 struct sk_buff *csum_skb = NULL; 488 tmp_csum = 0; 489 490 skb_queue_walk(&sk->sk_write_queue, skb) { 491 tmp_csum = csum_add(tmp_csum, skb->csum); 492 493 if (csum_skb) 494 continue; 495 496 len = skb->len - (skb->h.raw - skb->data); 497 if (offset >= len) { 498 offset -= len; 499 continue; 500 } 501 502 csum_skb = skb; 503 } 504 505 skb = csum_skb; 506 } 507 508 offset += skb->h.raw - skb->data; 509 if (skb_copy_bits(skb, offset, &csum, 2)) 510 BUG(); 511 512 /* in case cksum was not initialized */ 513 if (unlikely(csum)) 514 tmp_csum = csum_sub(tmp_csum, csum); 515 516 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 517 &fl->fl6_dst, 518 total_len, fl->proto, tmp_csum); 519 520 if (tmp_csum == 0) 521 tmp_csum = -1; 522 523 csum = tmp_csum; 524 if (skb_store_bits(skb, offset, &csum, 2)) 525 BUG(); 526 527 send: 528 err = ip6_push_pending_frames(sk); 529 out: 530 return err; 531 } 532 533 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 534 struct flowi *fl, struct rt6_info *rt, 535 unsigned int flags) 536 { 537 struct ipv6_pinfo *np = inet6_sk(sk); 538 struct ipv6hdr *iph; 539 struct sk_buff *skb; 540 unsigned int hh_len; 541 int err; 542 543 if (length > rt->u.dst.dev->mtu) { 544 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 545 return -EMSGSIZE; 546 } 547 if (flags&MSG_PROBE) 548 goto out; 549 550 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 551 552 skb = sock_alloc_send_skb(sk, length+hh_len+15, 553 flags&MSG_DONTWAIT, &err); 554 if (skb == NULL) 555 goto error; 556 skb_reserve(skb, hh_len); 557 558 skb->priority = sk->sk_priority; 559 skb->dst = dst_clone(&rt->u.dst); 560 561 skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length); 562 563 skb->ip_summed = CHECKSUM_NONE; 564 565 skb->h.raw = skb->nh.raw; 566 err = memcpy_fromiovecend((void *)iph, from, 0, length); 567 if (err) 568 goto error_fault; 569 570 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 571 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 572 dst_output); 573 if (err > 0) 574 err = np->recverr ? net_xmit_errno(err) : 0; 575 if (err) 576 goto error; 577 out: 578 return 0; 579 580 error_fault: 581 err = -EFAULT; 582 kfree_skb(skb); 583 error: 584 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 585 return err; 586 } 587 588 static void rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 589 { 590 struct iovec *iov; 591 u8 __user *type = NULL; 592 u8 __user *code = NULL; 593 int probed = 0; 594 int i; 595 596 if (!msg->msg_iov) 597 return; 598 599 for (i = 0; i < msg->msg_iovlen; i++) { 600 iov = &msg->msg_iov[i]; 601 if (!iov) 602 continue; 603 604 switch (fl->proto) { 605 case IPPROTO_ICMPV6: 606 /* check if one-byte field is readable or not. */ 607 if (iov->iov_base && iov->iov_len < 1) 608 break; 609 610 if (!type) { 611 type = iov->iov_base; 612 /* check if code field is readable or not. */ 613 if (iov->iov_len > 1) 614 code = type + 1; 615 } else if (!code) 616 code = iov->iov_base; 617 618 if (type && code) { 619 get_user(fl->fl_icmp_type, type); 620 __get_user(fl->fl_icmp_code, code); 621 probed = 1; 622 } 623 break; 624 default: 625 probed = 1; 626 break; 627 } 628 if (probed) 629 break; 630 } 631 } 632 633 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 634 struct msghdr *msg, size_t len) 635 { 636 struct ipv6_txoptions opt_space; 637 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 638 struct in6_addr *daddr, *final_p = NULL, final; 639 struct inet_sock *inet = inet_sk(sk); 640 struct ipv6_pinfo *np = inet6_sk(sk); 641 struct raw6_sock *rp = raw6_sk(sk); 642 struct ipv6_txoptions *opt = NULL; 643 struct ip6_flowlabel *flowlabel = NULL; 644 struct dst_entry *dst = NULL; 645 struct flowi fl; 646 int addr_len = msg->msg_namelen; 647 int hlimit = -1; 648 u16 proto; 649 int err; 650 651 /* Rough check on arithmetic overflow, 652 better check is made in ip6_build_xmit 653 */ 654 if (len < 0) 655 return -EMSGSIZE; 656 657 /* Mirror BSD error message compatibility */ 658 if (msg->msg_flags & MSG_OOB) 659 return -EOPNOTSUPP; 660 661 /* 662 * Get and verify the address. 663 */ 664 memset(&fl, 0, sizeof(fl)); 665 666 if (sin6) { 667 if (addr_len < SIN6_LEN_RFC2133) 668 return -EINVAL; 669 670 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 671 return(-EAFNOSUPPORT); 672 673 /* port is the proto value [0..255] carried in nexthdr */ 674 proto = ntohs(sin6->sin6_port); 675 676 if (!proto) 677 proto = inet->num; 678 else if (proto != inet->num) 679 return(-EINVAL); 680 681 if (proto > 255) 682 return(-EINVAL); 683 684 daddr = &sin6->sin6_addr; 685 if (np->sndflow) { 686 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 687 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 688 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 689 if (flowlabel == NULL) 690 return -EINVAL; 691 daddr = &flowlabel->dst; 692 } 693 } 694 695 /* 696 * Otherwise it will be difficult to maintain 697 * sk->sk_dst_cache. 698 */ 699 if (sk->sk_state == TCP_ESTABLISHED && 700 ipv6_addr_equal(daddr, &np->daddr)) 701 daddr = &np->daddr; 702 703 if (addr_len >= sizeof(struct sockaddr_in6) && 704 sin6->sin6_scope_id && 705 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 706 fl.oif = sin6->sin6_scope_id; 707 } else { 708 if (sk->sk_state != TCP_ESTABLISHED) 709 return -EDESTADDRREQ; 710 711 proto = inet->num; 712 daddr = &np->daddr; 713 fl.fl6_flowlabel = np->flow_label; 714 } 715 716 if (ipv6_addr_any(daddr)) { 717 /* 718 * unspecified destination address 719 * treated as error... is this correct ? 720 */ 721 fl6_sock_release(flowlabel); 722 return(-EINVAL); 723 } 724 725 if (fl.oif == 0) 726 fl.oif = sk->sk_bound_dev_if; 727 728 if (msg->msg_controllen) { 729 opt = &opt_space; 730 memset(opt, 0, sizeof(struct ipv6_txoptions)); 731 opt->tot_len = sizeof(struct ipv6_txoptions); 732 733 err = datagram_send_ctl(msg, &fl, opt, &hlimit); 734 if (err < 0) { 735 fl6_sock_release(flowlabel); 736 return err; 737 } 738 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 739 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 740 if (flowlabel == NULL) 741 return -EINVAL; 742 } 743 if (!(opt->opt_nflen|opt->opt_flen)) 744 opt = NULL; 745 } 746 if (opt == NULL) 747 opt = np->opt; 748 if (flowlabel) 749 opt = fl6_merge_options(&opt_space, flowlabel, opt); 750 751 fl.proto = proto; 752 rawv6_probe_proto_opt(&fl, msg); 753 754 ipv6_addr_copy(&fl.fl6_dst, daddr); 755 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 756 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 757 758 /* merge ip6_build_xmit from ip6_output */ 759 if (opt && opt->srcrt) { 760 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 761 ipv6_addr_copy(&final, &fl.fl6_dst); 762 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 763 final_p = &final; 764 } 765 766 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 767 fl.oif = np->mcast_oif; 768 769 err = ip6_dst_lookup(sk, &dst, &fl); 770 if (err) 771 goto out; 772 if (final_p) 773 ipv6_addr_copy(&fl.fl6_dst, final_p); 774 775 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 776 dst_release(dst); 777 goto out; 778 } 779 780 if (hlimit < 0) { 781 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 782 hlimit = np->mcast_hops; 783 else 784 hlimit = np->hop_limit; 785 if (hlimit < 0) 786 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 787 if (hlimit < 0) 788 hlimit = ipv6_get_hoplimit(dst->dev); 789 } 790 791 if (msg->msg_flags&MSG_CONFIRM) 792 goto do_confirm; 793 794 back_from_confirm: 795 if (inet->hdrincl) { 796 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 797 } else { 798 lock_sock(sk); 799 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 800 hlimit, opt, &fl, (struct rt6_info*)dst, msg->msg_flags); 801 802 if (err) 803 ip6_flush_pending_frames(sk); 804 else if (!(msg->msg_flags & MSG_MORE)) 805 err = rawv6_push_pending_frames(sk, &fl, rp); 806 } 807 done: 808 ip6_dst_store(sk, dst, 809 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 810 &np->daddr : NULL); 811 812 release_sock(sk); 813 out: 814 fl6_sock_release(flowlabel); 815 return err<0?err:len; 816 do_confirm: 817 dst_confirm(dst); 818 if (!(msg->msg_flags & MSG_PROBE) || len) 819 goto back_from_confirm; 820 err = 0; 821 goto done; 822 } 823 824 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 825 char __user *optval, int optlen) 826 { 827 switch (optname) { 828 case ICMPV6_FILTER: 829 if (optlen > sizeof(struct icmp6_filter)) 830 optlen = sizeof(struct icmp6_filter); 831 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 832 return -EFAULT; 833 return 0; 834 default: 835 return -ENOPROTOOPT; 836 }; 837 838 return 0; 839 } 840 841 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 842 char __user *optval, int __user *optlen) 843 { 844 int len; 845 846 switch (optname) { 847 case ICMPV6_FILTER: 848 if (get_user(len, optlen)) 849 return -EFAULT; 850 if (len < 0) 851 return -EINVAL; 852 if (len > sizeof(struct icmp6_filter)) 853 len = sizeof(struct icmp6_filter); 854 if (put_user(len, optlen)) 855 return -EFAULT; 856 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 857 return -EFAULT; 858 return 0; 859 default: 860 return -ENOPROTOOPT; 861 }; 862 863 return 0; 864 } 865 866 867 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 868 char __user *optval, int optlen) 869 { 870 struct raw6_sock *rp = raw6_sk(sk); 871 int val; 872 873 switch(level) { 874 case SOL_RAW: 875 break; 876 877 case SOL_ICMPV6: 878 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 879 return -EOPNOTSUPP; 880 return rawv6_seticmpfilter(sk, level, optname, optval, 881 optlen); 882 case SOL_IPV6: 883 if (optname == IPV6_CHECKSUM) 884 break; 885 default: 886 return ipv6_setsockopt(sk, level, optname, optval, 887 optlen); 888 }; 889 890 if (get_user(val, (int __user *)optval)) 891 return -EFAULT; 892 893 switch (optname) { 894 case IPV6_CHECKSUM: 895 /* You may get strange result with a positive odd offset; 896 RFC2292bis agrees with me. */ 897 if (val > 0 && (val&1)) 898 return(-EINVAL); 899 if (val < 0) { 900 rp->checksum = 0; 901 } else { 902 rp->checksum = 1; 903 rp->offset = val; 904 } 905 906 return 0; 907 break; 908 909 default: 910 return(-ENOPROTOOPT); 911 } 912 } 913 914 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 915 char __user *optval, int __user *optlen) 916 { 917 struct raw6_sock *rp = raw6_sk(sk); 918 int val, len; 919 920 switch(level) { 921 case SOL_RAW: 922 break; 923 924 case SOL_ICMPV6: 925 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 926 return -EOPNOTSUPP; 927 return rawv6_geticmpfilter(sk, level, optname, optval, 928 optlen); 929 case SOL_IPV6: 930 if (optname == IPV6_CHECKSUM) 931 break; 932 default: 933 return ipv6_getsockopt(sk, level, optname, optval, 934 optlen); 935 }; 936 937 if (get_user(len,optlen)) 938 return -EFAULT; 939 940 switch (optname) { 941 case IPV6_CHECKSUM: 942 if (rp->checksum == 0) 943 val = -1; 944 else 945 val = rp->offset; 946 break; 947 948 default: 949 return -ENOPROTOOPT; 950 } 951 952 len = min_t(unsigned int, sizeof(int), len); 953 954 if (put_user(len, optlen)) 955 return -EFAULT; 956 if (copy_to_user(optval,&val,len)) 957 return -EFAULT; 958 return 0; 959 } 960 961 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 962 { 963 switch(cmd) { 964 case SIOCOUTQ: 965 { 966 int amount = atomic_read(&sk->sk_wmem_alloc); 967 return put_user(amount, (int __user *)arg); 968 } 969 case SIOCINQ: 970 { 971 struct sk_buff *skb; 972 int amount = 0; 973 974 spin_lock_bh(&sk->sk_receive_queue.lock); 975 skb = skb_peek(&sk->sk_receive_queue); 976 if (skb != NULL) 977 amount = skb->tail - skb->h.raw; 978 spin_unlock_bh(&sk->sk_receive_queue.lock); 979 return put_user(amount, (int __user *)arg); 980 } 981 982 default: 983 return -ENOIOCTLCMD; 984 } 985 } 986 987 static void rawv6_close(struct sock *sk, long timeout) 988 { 989 if (inet_sk(sk)->num == IPPROTO_RAW) 990 ip6_ra_control(sk, -1, NULL); 991 992 sk_common_release(sk); 993 } 994 995 static int rawv6_init_sk(struct sock *sk) 996 { 997 if (inet_sk(sk)->num == IPPROTO_ICMPV6) { 998 struct raw6_sock *rp = raw6_sk(sk); 999 rp->checksum = 1; 1000 rp->offset = 2; 1001 } 1002 return(0); 1003 } 1004 1005 struct proto rawv6_prot = { 1006 .name = "RAWv6", 1007 .owner = THIS_MODULE, 1008 .close = rawv6_close, 1009 .connect = ip6_datagram_connect, 1010 .disconnect = udp_disconnect, 1011 .ioctl = rawv6_ioctl, 1012 .init = rawv6_init_sk, 1013 .destroy = inet6_destroy_sock, 1014 .setsockopt = rawv6_setsockopt, 1015 .getsockopt = rawv6_getsockopt, 1016 .sendmsg = rawv6_sendmsg, 1017 .recvmsg = rawv6_recvmsg, 1018 .bind = rawv6_bind, 1019 .backlog_rcv = rawv6_rcv_skb, 1020 .hash = raw_v6_hash, 1021 .unhash = raw_v6_unhash, 1022 .obj_size = sizeof(struct raw6_sock), 1023 }; 1024 1025 #ifdef CONFIG_PROC_FS 1026 struct raw6_iter_state { 1027 int bucket; 1028 }; 1029 1030 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private) 1031 1032 static struct sock *raw6_get_first(struct seq_file *seq) 1033 { 1034 struct sock *sk; 1035 struct hlist_node *node; 1036 struct raw6_iter_state* state = raw6_seq_private(seq); 1037 1038 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket) 1039 sk_for_each(sk, node, &raw_v6_htable[state->bucket]) 1040 if (sk->sk_family == PF_INET6) 1041 goto out; 1042 sk = NULL; 1043 out: 1044 return sk; 1045 } 1046 1047 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk) 1048 { 1049 struct raw6_iter_state* state = raw6_seq_private(seq); 1050 1051 do { 1052 sk = sk_next(sk); 1053 try_again: 1054 ; 1055 } while (sk && sk->sk_family != PF_INET6); 1056 1057 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) { 1058 sk = sk_head(&raw_v6_htable[state->bucket]); 1059 goto try_again; 1060 } 1061 return sk; 1062 } 1063 1064 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos) 1065 { 1066 struct sock *sk = raw6_get_first(seq); 1067 if (sk) 1068 while (pos && (sk = raw6_get_next(seq, sk)) != NULL) 1069 --pos; 1070 return pos ? NULL : sk; 1071 } 1072 1073 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos) 1074 { 1075 read_lock(&raw_v6_lock); 1076 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1077 } 1078 1079 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1080 { 1081 struct sock *sk; 1082 1083 if (v == SEQ_START_TOKEN) 1084 sk = raw6_get_first(seq); 1085 else 1086 sk = raw6_get_next(seq, v); 1087 ++*pos; 1088 return sk; 1089 } 1090 1091 static void raw6_seq_stop(struct seq_file *seq, void *v) 1092 { 1093 read_unlock(&raw_v6_lock); 1094 } 1095 1096 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1097 { 1098 struct ipv6_pinfo *np = inet6_sk(sp); 1099 struct in6_addr *dest, *src; 1100 __u16 destp, srcp; 1101 1102 dest = &np->daddr; 1103 src = &np->rcv_saddr; 1104 destp = 0; 1105 srcp = inet_sk(sp)->num; 1106 seq_printf(seq, 1107 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1108 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1109 i, 1110 src->s6_addr32[0], src->s6_addr32[1], 1111 src->s6_addr32[2], src->s6_addr32[3], srcp, 1112 dest->s6_addr32[0], dest->s6_addr32[1], 1113 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1114 sp->sk_state, 1115 atomic_read(&sp->sk_wmem_alloc), 1116 atomic_read(&sp->sk_rmem_alloc), 1117 0, 0L, 0, 1118 sock_i_uid(sp), 0, 1119 sock_i_ino(sp), 1120 atomic_read(&sp->sk_refcnt), sp); 1121 } 1122 1123 static int raw6_seq_show(struct seq_file *seq, void *v) 1124 { 1125 if (v == SEQ_START_TOKEN) 1126 seq_printf(seq, 1127 " sl " 1128 "local_address " 1129 "remote_address " 1130 "st tx_queue rx_queue tr tm->when retrnsmt" 1131 " uid timeout inode\n"); 1132 else 1133 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket); 1134 return 0; 1135 } 1136 1137 static struct seq_operations raw6_seq_ops = { 1138 .start = raw6_seq_start, 1139 .next = raw6_seq_next, 1140 .stop = raw6_seq_stop, 1141 .show = raw6_seq_show, 1142 }; 1143 1144 static int raw6_seq_open(struct inode *inode, struct file *file) 1145 { 1146 struct seq_file *seq; 1147 int rc = -ENOMEM; 1148 struct raw6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 1149 if (!s) 1150 goto out; 1151 rc = seq_open(file, &raw6_seq_ops); 1152 if (rc) 1153 goto out_kfree; 1154 seq = file->private_data; 1155 seq->private = s; 1156 memset(s, 0, sizeof(*s)); 1157 out: 1158 return rc; 1159 out_kfree: 1160 kfree(s); 1161 goto out; 1162 } 1163 1164 static struct file_operations raw6_seq_fops = { 1165 .owner = THIS_MODULE, 1166 .open = raw6_seq_open, 1167 .read = seq_read, 1168 .llseek = seq_lseek, 1169 .release = seq_release_private, 1170 }; 1171 1172 int __init raw6_proc_init(void) 1173 { 1174 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops)) 1175 return -ENOMEM; 1176 return 0; 1177 } 1178 1179 void raw6_proc_exit(void) 1180 { 1181 proc_net_remove("raw6"); 1182 } 1183 #endif /* CONFIG_PROC_FS */ 1184