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   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/net_namespace.h>
  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 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  54 #include <net/mip6.h>
  55 #endif
  56
  57 #include <net/raw.h>
  58 #include <net/rawv6.h>
  59 #include <net/xfrm.h>
  60
  61 #include <linux/proc_fs.h>
  62 #include <linux/seq_file.h>
  63
  64 static struct raw_hashinfo raw_v6_hashinfo = {
  65         .lock = __RW_LOCK_UNLOCKED(),
  66 };
  67
  68 static void raw_v6_hash(struct sock *sk)
  69 {
  70         raw_hash_sk(sk, &raw_v6_hashinfo);
  71 }
  72
  73 static void raw_v6_unhash(struct sock *sk)
  74 {
  75         raw_unhash_sk(sk, &raw_v6_hashinfo);
  76 }
  77
  78
  79 static struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
  80                 struct in6_addr *loc_addr, struct in6_addr *rmt_addr, int dif)
  81 {
  82         struct hlist_node *node;
  83         int is_multicast = ipv6_addr_is_multicast(loc_addr);
  84
  85         sk_for_each_from(sk, node)
  86                 if (inet_sk(sk)->num == num) {
  87                         struct ipv6_pinfo *np = inet6_sk(sk);
  88
  89                         if (!ipv6_addr_any(&np->daddr) &&
  90                             !ipv6_addr_equal(&np->daddr, rmt_addr))
  91                                 continue;
  92
  93                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
  94                                 continue;
  95
  96                         if (!ipv6_addr_any(&np->rcv_saddr)) {
  97                                 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
  98                                         goto found;
  99                                 if (is_multicast &&
 100                                     inet6_mc_check(sk, loc_addr, rmt_addr))
 101                                         goto found;
 102                                 continue;
 103                         }
 104                         goto found;
 105                 }
 106         sk = NULL;
 107 found:
 108         return sk;
 109 }
 110
 111 /*
 112  *      0 - deliver
 113  *      1 - block
 114  */
 115 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
 116 {
 117         struct icmp6hdr *icmph;
 118         struct raw6_sock *rp = raw6_sk(sk);
 119
 120         if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
 121                 __u32 *data = &rp->filter.data[0];
 122                 int bit_nr;
 123
 124                 icmph = (struct icmp6hdr *) skb->data;
 125                 bit_nr = icmph->icmp6_type;
 126
 127                 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
 128         }
 129         return 0;
 130 }
 131
 132 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 133 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
 134
 135 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
 136                                            struct sk_buff *skb))
 137 {
 138         rcu_assign_pointer(mh_filter, filter);
 139         return 0;
 140 }
 141 EXPORT_SYMBOL(rawv6_mh_filter_register);
 142
 143 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
 144                                              struct sk_buff *skb))
 145 {
 146         rcu_assign_pointer(mh_filter, NULL);
 147         synchronize_rcu();
 148         return 0;
 149 }
 150 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
 151
 152 #endif
 153
 154 /*
 155  *      demultiplex raw sockets.
 156  *      (should consider queueing the skb in the sock receive_queue
 157  *      without calling rawv6.c)
 158  *
 159  *      Caller owns SKB so we must make clones.
 160  */
 161 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 162 {
 163         struct in6_addr *saddr;
 164         struct in6_addr *daddr;
 165         struct sock *sk;
 166         int delivered = 0;
 167         __u8 hash;
 168
 169         saddr = &ipv6_hdr(skb)->saddr;
 170         daddr = saddr + 1;
 171
 172         hash = nexthdr & (MAX_INET_PROTOS - 1);
 173
 174         read_lock(&raw_v6_hashinfo.lock);
 175         sk = sk_head(&raw_v6_hashinfo.ht[hash]);
 176
 177         /*
 178          *      The first socket found will be delivered after
 179          *      delivery to transport protocols.
 180          */
 181
 182         if (sk == NULL)
 183                 goto out;
 184
 185         sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
 186
 187         while (sk) {
 188                 int filtered;
 189
 190                 delivered = 1;
 191                 switch (nexthdr) {
 192                 case IPPROTO_ICMPV6:
 193                         filtered = icmpv6_filter(sk, skb);
 194                         break;
 195
 196 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 197                 case IPPROTO_MH:
 198                 {
 199                         /* XXX: To validate MH only once for each packet,
 200                          * this is placed here. It should be after checking
 201                          * xfrm policy, however it doesn't. The checking xfrm
 202                          * policy is placed in rawv6_rcv() because it is
 203                          * required for each socket.
 204                          */
 205                         int (*filter)(struct sock *sock, struct sk_buff *skb);
 206
 207                         filter = rcu_dereference(mh_filter);
 208                         filtered = filter ? filter(sk, skb) : 0;
 209                         break;
 210                 }
 211 #endif
 212                 default:
 213                         filtered = 0;
 214                         break;
 215                 }
 216
 217                 if (filtered < 0)
 218                         break;
 219                 if (filtered == 0) {
 220                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 221
 222                         /* Not releasing hash table! */
 223                         if (clone) {
 224                                 nf_reset(clone);
 225                                 rawv6_rcv(sk, clone);
 226                         }
 227                 }
 228                 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
 229                                      IP6CB(skb)->iif);
 230         }
 231 out:
 232         read_unlock(&raw_v6_hashinfo.lock);
 233         return delivered;
 234 }
 235
 236 int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
 237 {
 238         struct sock *raw_sk;
 239
 240         raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
 241         if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
 242                 raw_sk = NULL;
 243
 244         return raw_sk != NULL;
 245 }
 246
 247 /* This cleans up af_inet6 a bit. -DaveM */
 248 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 249 {
 250         struct inet_sock *inet = inet_sk(sk);
 251         struct ipv6_pinfo *np = inet6_sk(sk);
 252         struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
 253         __be32 v4addr = 0;
 254         int addr_type;
 255         int err;
 256
 257         if (addr_len < SIN6_LEN_RFC2133)
 258                 return -EINVAL;
 259         addr_type = ipv6_addr_type(&addr->sin6_addr);
 260
 261         /* Raw sockets are IPv6 only */
 262         if (addr_type == IPV6_ADDR_MAPPED)
 263                 return(-EADDRNOTAVAIL);
 264
 265         lock_sock(sk);
 266
 267         err = -EINVAL;
 268         if (sk->sk_state != TCP_CLOSE)
 269                 goto out;
 270
 271         /* Check if the address belongs to the host. */
 272         if (addr_type != IPV6_ADDR_ANY) {
 273                 struct net_device *dev = NULL;
 274
 275                 if (addr_type & IPV6_ADDR_LINKLOCAL) {
 276                         if (addr_len >= sizeof(struct sockaddr_in6) &&
 277                             addr->sin6_scope_id) {
 278                                 /* Override any existing binding, if another
 279                                  * one is supplied by user.
 280                                  */
 281                                 sk->sk_bound_dev_if = addr->sin6_scope_id;
 282                         }
 283
 284                         /* Binding to link-local address requires an interface */
 285                         if (!sk->sk_bound_dev_if)
 286                                 goto out;
 287
 288                         dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
 289                         if (!dev) {
 290                                 err = -ENODEV;
 291                                 goto out;
 292                         }
 293                 }
 294
 295                 /* ipv4 addr of the socket is invalid.  Only the
 296                  * unspecified and mapped address have a v4 equivalent.
 297                  */
 298                 v4addr = LOOPBACK4_IPV6;
 299                 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 300                         err = -EADDRNOTAVAIL;
 301                         if (!ipv6_chk_addr(&init_net, &addr->sin6_addr,
 302                                            dev, 0)) {
 303                                 if (dev)
 304                                         dev_put(dev);
 305                                 goto out;
 306                         }
 307                 }
 308                 if (dev)
 309                         dev_put(dev);
 310         }
 311
 312         inet->rcv_saddr = inet->saddr = v4addr;
 313         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 314         if (!(addr_type & IPV6_ADDR_MULTICAST))
 315                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 316         err = 0;
 317 out:
 318         release_sock(sk);
 319         return err;
 320 }
 321
 322 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
 323                struct inet6_skb_parm *opt,
 324                int type, int code, int offset, __be32 info)
 325 {
 326         struct inet_sock *inet = inet_sk(sk);
 327         struct ipv6_pinfo *np = inet6_sk(sk);
 328         int err;
 329         int harderr;
 330
 331         /* Report error on raw socket, if:
 332            1. User requested recverr.
 333            2. Socket is connected (otherwise the error indication
 334               is useless without recverr and error is hard.
 335          */
 336         if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
 337                 return;
 338
 339         harderr = icmpv6_err_convert(type, code, &err);
 340         if (type == ICMPV6_PKT_TOOBIG)
 341                 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
 342
 343         if (np->recverr) {
 344                 u8 *payload = skb->data;
 345                 if (!inet->hdrincl)
 346                         payload += offset;
 347                 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
 348         }
 349
 350         if (np->recverr || harderr) {
 351                 sk->sk_err = err;
 352                 sk->sk_error_report(sk);
 353         }
 354 }
 355
 356 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
 357                 int type, int code, int inner_offset, __be32 info)
 358 {
 359         struct sock *sk;
 360         int hash;
 361         struct in6_addr *saddr, *daddr;
 362
 363         hash = nexthdr & (RAW_HTABLE_SIZE - 1);
 364
 365         read_lock(&raw_v6_hashinfo.lock);
 366         sk = sk_head(&raw_v6_hashinfo.ht[hash]);
 367         if (sk != NULL) {
 368                 saddr = &ipv6_hdr(skb)->saddr;
 369                 daddr = &ipv6_hdr(skb)->daddr;
 370
 371                 while ((sk = __raw_v6_lookup(sk, nexthdr, saddr, daddr,
 372                                                 IP6CB(skb)->iif))) {
 373                         rawv6_err(sk, skb, NULL, type, code,
 374                                         inner_offset, info);
 375                         sk = sk_next(sk);
 376                 }
 377         }
 378         read_unlock(&raw_v6_hashinfo.lock);
 379 }
 380
 381 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
 382 {
 383         if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
 384             skb_checksum_complete(skb)) {
 385                 atomic_inc(&sk->sk_drops);
 386                 kfree_skb(skb);
 387                 return 0;
 388         }
 389
 390         /* Charge it to the socket. */
 391         if (sock_queue_rcv_skb(sk,skb)<0) {
 392                 atomic_inc(&sk->sk_drops);
 393                 kfree_skb(skb);
 394                 return 0;
 395         }
 396
 397         return 0;
 398 }
 399
 400 /*
 401  *      This is next to useless...
 402  *      if we demultiplex in network layer we don't need the extra call
 403  *      just to queue the skb...
 404  *      maybe we could have the network decide upon a hint if it
 405  *      should call raw_rcv for demultiplexing
 406  */
 407 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
 408 {
 409         struct inet_sock *inet = inet_sk(sk);
 410         struct raw6_sock *rp = raw6_sk(sk);
 411
 412         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
 413                 atomic_inc(&sk->sk_drops);
 414                 kfree_skb(skb);
 415                 return NET_RX_DROP;
 416         }
 417
 418         if (!rp->checksum)
 419                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 420
 421         if (skb->ip_summed == CHECKSUM_COMPLETE) {
 422                 skb_postpull_rcsum(skb, skb_network_header(skb),
 423                                    skb_network_header_len(skb));
 424                 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 425                                      &ipv6_hdr(skb)->daddr,
 426                                      skb->len, inet->num, skb->csum))
 427                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 428         }
 429         if (!skb_csum_unnecessary(skb))
 430                 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 431                                                          &ipv6_hdr(skb)->daddr,
 432                                                          skb->len,
 433                                                          inet->num, 0));
 434
 435         if (inet->hdrincl) {
 436                 if (skb_checksum_complete(skb)) {
 437                         atomic_inc(&sk->sk_drops);
 438                         kfree_skb(skb);
 439                         return 0;
 440                 }
 441         }
 442
 443         rawv6_rcv_skb(sk, skb);
 444         return 0;
 445 }
 446
 447
 448 /*
 449  *      This should be easy, if there is something there
 450  *      we return it, otherwise we block.
 451  */
 452
 453 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
 454                   struct msghdr *msg, size_t len,
 455                   int noblock, int flags, int *addr_len)
 456 {
 457         struct ipv6_pinfo *np = inet6_sk(sk);
 458         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
 459         struct sk_buff *skb;
 460         size_t copied;
 461         int err;
 462
 463         if (flags & MSG_OOB)
 464                 return -EOPNOTSUPP;
 465
 466         if (addr_len)
 467                 *addr_len=sizeof(*sin6);
 468
 469         if (flags & MSG_ERRQUEUE)
 470                 return ipv6_recv_error(sk, msg, len);
 471
 472         skb = skb_recv_datagram(sk, flags, noblock, &err);
 473         if (!skb)
 474                 goto out;
 475
 476         copied = skb->len;
 477         if (copied > len) {
 478                 copied = len;
 479                 msg->msg_flags |= MSG_TRUNC;
 480         }
 481
 482         if (skb_csum_unnecessary(skb)) {
 483                 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 484         } else if (msg->msg_flags&MSG_TRUNC) {
 485                 if (__skb_checksum_complete(skb))
 486                         goto csum_copy_err;
 487                 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 488         } else {
 489                 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
 490                 if (err == -EINVAL)
 491                         goto csum_copy_err;
 492         }
 493         if (err)
 494                 goto out_free;
 495
 496         /* Copy the address. */
 497         if (sin6) {
 498                 sin6->sin6_family = AF_INET6;
 499                 sin6->sin6_port = 0;
 500                 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
 501                 sin6->sin6_flowinfo = 0;
 502                 sin6->sin6_scope_id = 0;
 503                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 504                         sin6->sin6_scope_id = IP6CB(skb)->iif;
 505         }
 506
 507         sock_recv_timestamp(msg, sk, skb);
 508
 509         if (np->rxopt.all)
 510                 datagram_recv_ctl(sk, msg, skb);
 511
 512         err = copied;
 513         if (flags & MSG_TRUNC)
 514                 err = skb->len;
 515
 516 out_free:
 517         skb_free_datagram(sk, skb);
 518 out:
 519         return err;
 520
 521 csum_copy_err:
 522         skb_kill_datagram(sk, skb, flags);
 523
 524         /* Error for blocking case is chosen to masquerade
 525            as some normal condition.
 526          */
 527         err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
 528         atomic_inc(&sk->sk_drops);
 529         goto out;
 530 }
 531
 532 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
 533                                      struct raw6_sock *rp)
 534 {
 535         struct sk_buff *skb;
 536         int err = 0;
 537         int offset;
 538         int len;
 539         int total_len;
 540         __wsum tmp_csum;
 541         __sum16 csum;
 542
 543         if (!rp->checksum)
 544                 goto send;
 545
 546         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
 547                 goto out;
 548
 549         offset = rp->offset;
 550         total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
 551                                                 skb->data);
 552         if (offset >= total_len - 1) {
 553                 err = -EINVAL;
 554                 ip6_flush_pending_frames(sk);
 555                 goto out;
 556         }
 557
 558         /* should be check HW csum miyazawa */
 559         if (skb_queue_len(&sk->sk_write_queue) == 1) {
 560                 /*
 561                  * Only one fragment on the socket.
 562                  */
 563                 tmp_csum = skb->csum;
 564         } else {
 565                 struct sk_buff *csum_skb = NULL;
 566                 tmp_csum = 0;
 567
 568                 skb_queue_walk(&sk->sk_write_queue, skb) {
 569                         tmp_csum = csum_add(tmp_csum, skb->csum);
 570
 571                         if (csum_skb)
 572                                 continue;
 573
 574                         len = skb->len - skb_transport_offset(skb);
 575                         if (offset >= len) {
 576                                 offset -= len;
 577                                 continue;
 578                         }
 579
 580                         csum_skb = skb;
 581                 }
 582
 583                 skb = csum_skb;
 584         }
 585
 586         offset += skb_transport_offset(skb);
 587         if (skb_copy_bits(skb, offset, &csum, 2))
 588                 BUG();
 589
 590         /* in case cksum was not initialized */
 591         if (unlikely(csum))
 592                 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
 593
 594         csum = csum_ipv6_magic(&fl->fl6_src,
 595                                    &fl->fl6_dst,
 596                                    total_len, fl->proto, tmp_csum);
 597
 598         if (csum == 0 && fl->proto == IPPROTO_UDP)
 599                 csum = CSUM_MANGLED_0;
 600
 601         if (skb_store_bits(skb, offset, &csum, 2))
 602                 BUG();
 603
 604 send:
 605         err = ip6_push_pending_frames(sk);
 606 out:
 607         return err;
 608 }
 609
 610 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
 611                         struct flowi *fl, struct rt6_info *rt,
 612                         unsigned int flags)
 613 {
 614         struct ipv6_pinfo *np = inet6_sk(sk);
 615         struct ipv6hdr *iph;
 616         struct sk_buff *skb;
 617         unsigned int hh_len;
 618         int err;
 619
 620         if (length > rt->u.dst.dev->mtu) {
 621                 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
 622                 return -EMSGSIZE;
 623         }
 624         if (flags&MSG_PROBE)
 625                 goto out;
 626
 627         hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
 628
 629         skb = sock_alloc_send_skb(sk, length+hh_len+15,
 630                                   flags&MSG_DONTWAIT, &err);
 631         if (skb == NULL)
 632                 goto error;
 633         skb_reserve(skb, hh_len);
 634
 635         skb->priority = sk->sk_priority;
 636         skb->dst = dst_clone(&rt->u.dst);
 637
 638         skb_put(skb, length);
 639         skb_reset_network_header(skb);
 640         iph = ipv6_hdr(skb);
 641
 642         skb->ip_summed = CHECKSUM_NONE;
 643
 644         skb->transport_header = skb->network_header;
 645         err = memcpy_fromiovecend((void *)iph, from, 0, length);
 646         if (err)
 647                 goto error_fault;
 648
 649         IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
 650         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
 651                       dst_output);
 652         if (err > 0)
 653                 err = np->recverr ? net_xmit_errno(err) : 0;
 654         if (err)
 655                 goto error;
 656 out:
 657         return 0;
 658
 659 error_fault:
 660         err = -EFAULT;
 661         kfree_skb(skb);
 662 error:
 663         IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
 664         return err;
 665 }
 666
 667 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
 668 {
 669         struct iovec *iov;
 670         u8 __user *type = NULL;
 671         u8 __user *code = NULL;
 672         u8 len = 0;
 673         int probed = 0;
 674         int i;
 675
 676         if (!msg->msg_iov)
 677                 return 0;
 678
 679         for (i = 0; i < msg->msg_iovlen; i++) {
 680                 iov = &msg->msg_iov[i];
 681                 if (!iov)
 682                         continue;
 683
 684                 switch (fl->proto) {
 685                 case IPPROTO_ICMPV6:
 686                         /* check if one-byte field is readable or not. */
 687                         if (iov->iov_base && iov->iov_len < 1)
 688                                 break;
 689
 690                         if (!type) {
 691                                 type = iov->iov_base;
 692                                 /* check if code field is readable or not. */
 693                                 if (iov->iov_len > 1)
 694                                         code = type + 1;
 695                         } else if (!code)
 696                                 code = iov->iov_base;
 697
 698                         if (type && code) {
 699                                 if (get_user(fl->fl_icmp_type, type) ||
 700                                     get_user(fl->fl_icmp_code, code))
 701                                         return -EFAULT;
 702                                 probed = 1;
 703                         }
 704                         break;
 705                 case IPPROTO_MH:
 706                         if (iov->iov_base && iov->iov_len < 1)
 707                                 break;
 708                         /* check if type field is readable or not. */
 709                         if (iov->iov_len > 2 - len) {
 710                                 u8 __user *p = iov->iov_base;
 711                                 if (get_user(fl->fl_mh_type, &p[2 - len]))
 712                                         return -EFAULT;
 713                                 probed = 1;
 714                         } else
 715                                 len += iov->iov_len;
 716
 717                         break;
 718                 default:
 719                         probed = 1;
 720                         break;
 721                 }
 722                 if (probed)
 723                         break;
 724         }
 725         return 0;
 726 }
 727
 728 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 729                    struct msghdr *msg, size_t len)
 730 {
 731         struct ipv6_txoptions opt_space;
 732         struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
 733         struct in6_addr *daddr, *final_p = NULL, final;
 734         struct inet_sock *inet = inet_sk(sk);
 735         struct ipv6_pinfo *np = inet6_sk(sk);
 736         struct raw6_sock *rp = raw6_sk(sk);
 737         struct ipv6_txoptions *opt = NULL;
 738         struct ip6_flowlabel *flowlabel = NULL;
 739         struct dst_entry *dst = NULL;
 740         struct flowi fl;
 741         int addr_len = msg->msg_namelen;
 742         int hlimit = -1;
 743         int tclass = -1;
 744         u16 proto;
 745         int err;
 746
 747         /* Rough check on arithmetic overflow,
 748            better check is made in ip6_append_data().
 749          */
 750         if (len > INT_MAX)
 751                 return -EMSGSIZE;
 752
 753         /* Mirror BSD error message compatibility */
 754         if (msg->msg_flags & MSG_OOB)
 755                 return -EOPNOTSUPP;
 756
 757         /*
 758          *      Get and verify the address.
 759          */
 760         memset(&fl, 0, sizeof(fl));
 761
 762         if (sin6) {
 763                 if (addr_len < SIN6_LEN_RFC2133)
 764                         return -EINVAL;
 765
 766                 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
 767                         return(-EAFNOSUPPORT);
 768
 769                 /* port is the proto value [0..255] carried in nexthdr */
 770                 proto = ntohs(sin6->sin6_port);
 771
 772                 if (!proto)
 773                         proto = inet->num;
 774                 else if (proto != inet->num)
 775                         return(-EINVAL);
 776
 777                 if (proto > 255)
 778                         return(-EINVAL);
 779
 780                 daddr = &sin6->sin6_addr;
 781                 if (np->sndflow) {
 782                         fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 783                         if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
 784                                 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 785                                 if (flowlabel == NULL)
 786                                         return -EINVAL;
 787                                 daddr = &flowlabel->dst;
 788                         }
 789                 }
 790
 791                 /*
 792                  * Otherwise it will be difficult to maintain
 793                  * sk->sk_dst_cache.
 794                  */
 795                 if (sk->sk_state == TCP_ESTABLISHED &&
 796                     ipv6_addr_equal(daddr, &np->daddr))
 797                         daddr = &np->daddr;
 798
 799                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 800                     sin6->sin6_scope_id &&
 801                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
 802                         fl.oif = sin6->sin6_scope_id;
 803         } else {
 804                 if (sk->sk_state != TCP_ESTABLISHED)
 805                         return -EDESTADDRREQ;
 806
 807                 proto = inet->num;
 808                 daddr = &np->daddr;
 809                 fl.fl6_flowlabel = np->flow_label;
 810         }
 811
 812         if (ipv6_addr_any(daddr)) {
 813                 /*
 814                  * unspecified destination address
 815                  * treated as error... is this correct ?
 816                  */
 817                 fl6_sock_release(flowlabel);
 818                 return(-EINVAL);
 819         }
 820
 821         if (fl.oif == 0)
 822                 fl.oif = sk->sk_bound_dev_if;
 823
 824         if (msg->msg_controllen) {
 825                 opt = &opt_space;
 826                 memset(opt, 0, sizeof(struct ipv6_txoptions));
 827                 opt->tot_len = sizeof(struct ipv6_txoptions);
 828
 829                 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
 830                 if (err < 0) {
 831                         fl6_sock_release(flowlabel);
 832                         return err;
 833                 }
 834                 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
 835                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 836                         if (flowlabel == NULL)
 837                                 return -EINVAL;
 838                 }
 839                 if (!(opt->opt_nflen|opt->opt_flen))
 840                         opt = NULL;
 841         }
 842         if (opt == NULL)
 843                 opt = np->opt;
 844         if (flowlabel)
 845                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
 846         opt = ipv6_fixup_options(&opt_space, opt);
 847
 848         fl.proto = proto;
 849         err = rawv6_probe_proto_opt(&fl, msg);
 850         if (err)
 851                 goto out;
 852
 853         ipv6_addr_copy(&fl.fl6_dst, daddr);
 854         if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
 855                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 856
 857         /* merge ip6_build_xmit from ip6_output */
 858         if (opt && opt->srcrt) {
 859                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 860                 ipv6_addr_copy(&final, &fl.fl6_dst);
 861                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 862                 final_p = &final;
 863         }
 864
 865         if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
 866                 fl.oif = np->mcast_oif;
 867         security_sk_classify_flow(sk, &fl);
 868
 869         err = ip6_dst_lookup(sk, &dst, &fl);
 870         if (err)
 871                 goto out;
 872         if (final_p)
 873                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 874
 875         if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
 876                 if (err == -EREMOTE)
 877                         err = ip6_dst_blackhole(sk, &dst, &fl);
 878                 if (err < 0)
 879                         goto out;
 880         }
 881
 882         if (hlimit < 0) {
 883                 if (ipv6_addr_is_multicast(&fl.fl6_dst))
 884                         hlimit = np->mcast_hops;
 885                 else
 886                         hlimit = np->hop_limit;
 887                 if (hlimit < 0)
 888                         hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 889                 if (hlimit < 0)
 890                         hlimit = ipv6_get_hoplimit(dst->dev);
 891         }
 892
 893         if (tclass < 0) {
 894                 tclass = np->tclass;
 895                 if (tclass < 0)
 896                         tclass = 0;
 897         }
 898
 899         if (msg->msg_flags&MSG_CONFIRM)
 900                 goto do_confirm;
 901
 902 back_from_confirm:
 903         if (inet->hdrincl) {
 904                 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
 905         } else {
 906                 lock_sock(sk);
 907                 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
 908                         len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
 909                         msg->msg_flags);
 910
 911                 if (err)
 912                         ip6_flush_pending_frames(sk);
 913                 else if (!(msg->msg_flags & MSG_MORE))
 914                         err = rawv6_push_pending_frames(sk, &fl, rp);
 915                 release_sock(sk);
 916         }
 917 done:
 918         dst_release(dst);
 919 out:
 920         fl6_sock_release(flowlabel);
 921         return err<0?err:len;
 922 do_confirm:
 923         dst_confirm(dst);
 924         if (!(msg->msg_flags & MSG_PROBE) || len)
 925                 goto back_from_confirm;
 926         err = 0;
 927         goto done;
 928 }
 929
 930 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
 931                                char __user *optval, int optlen)
 932 {
 933         switch (optname) {
 934         case ICMPV6_FILTER:
 935                 if (optlen > sizeof(struct icmp6_filter))
 936                         optlen = sizeof(struct icmp6_filter);
 937                 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
 938                         return -EFAULT;
 939                 return 0;
 940         default:
 941                 return -ENOPROTOOPT;
 942         }
 943
 944         return 0;
 945 }
 946
 947 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
 948                                char __user *optval, int __user *optlen)
 949 {
 950         int len;
 951
 952         switch (optname) {
 953         case ICMPV6_FILTER:
 954                 if (get_user(len, optlen))
 955                         return -EFAULT;
 956                 if (len < 0)
 957                         return -EINVAL;
 958                 if (len > sizeof(struct icmp6_filter))
 959                         len = sizeof(struct icmp6_filter);
 960                 if (put_user(len, optlen))
 961                         return -EFAULT;
 962                 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
 963                         return -EFAULT;
 964                 return 0;
 965         default:
 966                 return -ENOPROTOOPT;
 967         }
 968
 969         return 0;
 970 }
 971
 972
 973 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
 974                             char __user *optval, int optlen)
 975 {
 976         struct raw6_sock *rp = raw6_sk(sk);
 977         int val;
 978
 979         if (get_user(val, (int __user *)optval))
 980                 return -EFAULT;
 981
 982         switch (optname) {
 983                 case IPV6_CHECKSUM:
 984                         /* You may get strange result with a positive odd offset;
 985                            RFC2292bis agrees with me. */
 986                         if (val > 0 && (val&1))
 987                                 return(-EINVAL);
 988                         if (val < 0) {
 989                                 rp->checksum = 0;
 990                         } else {
 991                                 rp->checksum = 1;
 992                                 rp->offset = val;
 993                         }
 994
 995                         return 0;
 996                         break;
 997
 998                 default:
 999                         return(-ENOPROTOOPT);
1000         }
1001 }
1002
1003 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1004                           char __user *optval, int optlen)
1005 {
1006         switch(level) {
1007                 case SOL_RAW:
1008                         break;
1009
1010                 case SOL_ICMPV6:
1011                         if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1012                                 return -EOPNOTSUPP;
1013                         return rawv6_seticmpfilter(sk, level, optname, optval,
1014                                                    optlen);
1015                 case SOL_IPV6:
1016                         if (optname == IPV6_CHECKSUM)
1017                                 break;
1018                 default:
1019                         return ipv6_setsockopt(sk, level, optname, optval,
1020                                                optlen);
1021         }
1022
1023         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1024 }
1025
1026 #ifdef CONFIG_COMPAT
1027 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1028                                    char __user *optval, int optlen)
1029 {
1030         switch (level) {
1031         case SOL_RAW:
1032                 break;
1033         case SOL_ICMPV6:
1034                 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1035                         return -EOPNOTSUPP;
1036                 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1037         case SOL_IPV6:
1038                 if (optname == IPV6_CHECKSUM)
1039                         break;
1040         default:
1041                 return compat_ipv6_setsockopt(sk, level, optname,
1042                                               optval, optlen);
1043         }
1044         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1045 }
1046 #endif
1047
1048 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1049                             char __user *optval, int __user *optlen)
1050 {
1051         struct raw6_sock *rp = raw6_sk(sk);
1052         int val, len;
1053
1054         if (get_user(len,optlen))
1055                 return -EFAULT;
1056
1057         switch (optname) {
1058         case IPV6_CHECKSUM:
1059                 if (rp->checksum == 0)
1060                         val = -1;
1061                 else
1062                         val = rp->offset;
1063                 break;
1064
1065         default:
1066                 return -ENOPROTOOPT;
1067         }
1068
1069         len = min_t(unsigned int, sizeof(int), len);
1070
1071         if (put_user(len, optlen))
1072                 return -EFAULT;
1073         if (copy_to_user(optval,&val,len))
1074                 return -EFAULT;
1075         return 0;
1076 }
1077
1078 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1079                           char __user *optval, int __user *optlen)
1080 {
1081         switch(level) {
1082                 case SOL_RAW:
1083                         break;
1084
1085                 case SOL_ICMPV6:
1086                         if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1087                                 return -EOPNOTSUPP;
1088                         return rawv6_geticmpfilter(sk, level, optname, optval,
1089                                                    optlen);
1090                 case SOL_IPV6:
1091                         if (optname == IPV6_CHECKSUM)
1092                                 break;
1093                 default:
1094                         return ipv6_getsockopt(sk, level, optname, optval,
1095                                                optlen);
1096         }
1097
1098         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1099 }
1100
1101 #ifdef CONFIG_COMPAT
1102 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1103                                    char __user *optval, int __user *optlen)
1104 {
1105         switch (level) {
1106         case SOL_RAW:
1107                 break;
1108         case SOL_ICMPV6:
1109                 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1110                         return -EOPNOTSUPP;
1111                 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1112         case SOL_IPV6:
1113                 if (optname == IPV6_CHECKSUM)
1114                         break;
1115         default:
1116                 return compat_ipv6_getsockopt(sk, level, optname,
1117                                               optval, optlen);
1118         }
1119         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1120 }
1121 #endif
1122
1123 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1124 {
1125         switch(cmd) {
1126                 case SIOCOUTQ:
1127                 {
1128                         int amount = atomic_read(&sk->sk_wmem_alloc);
1129                         return put_user(amount, (int __user *)arg);
1130                 }
1131                 case SIOCINQ:
1132                 {
1133                         struct sk_buff *skb;
1134                         int amount = 0;
1135
1136                         spin_lock_bh(&sk->sk_receive_queue.lock);
1137                         skb = skb_peek(&sk->sk_receive_queue);
1138                         if (skb != NULL)
1139                                 amount = skb->tail - skb->transport_header;
1140                         spin_unlock_bh(&sk->sk_receive_queue.lock);
1141                         return put_user(amount, (int __user *)arg);
1142                 }
1143
1144                 default:
1145                         return -ENOIOCTLCMD;
1146         }
1147 }
1148
1149 static void rawv6_close(struct sock *sk, long timeout)
1150 {
1151         if (inet_sk(sk)->num == IPPROTO_RAW)
1152                 ip6_ra_control(sk, -1, NULL);
1153
1154         sk_common_release(sk);
1155 }
1156
1157 static int rawv6_init_sk(struct sock *sk)
1158 {
1159         struct raw6_sock *rp = raw6_sk(sk);
1160
1161         switch (inet_sk(sk)->num) {
1162         case IPPROTO_ICMPV6:
1163                 rp->checksum = 1;
1164                 rp->offset   = 2;
1165                 break;
1166         case IPPROTO_MH:
1167                 rp->checksum = 1;
1168                 rp->offset   = 4;
1169                 break;
1170         default:
1171                 break;
1172         }
1173         return(0);
1174 }
1175
1176 DEFINE_PROTO_INUSE(rawv6)
1177
1178 struct proto rawv6_prot = {
1179         .name              = "RAWv6",
1180         .owner             = THIS_MODULE,
1181         .close             = rawv6_close,
1182         .connect           = ip6_datagram_connect,
1183         .disconnect        = udp_disconnect,
1184         .ioctl             = rawv6_ioctl,
1185         .init              = rawv6_init_sk,
1186         .destroy           = inet6_destroy_sock,
1187         .setsockopt        = rawv6_setsockopt,
1188         .getsockopt        = rawv6_getsockopt,
1189         .sendmsg           = rawv6_sendmsg,
1190         .recvmsg           = rawv6_recvmsg,
1191         .bind              = rawv6_bind,
1192         .backlog_rcv       = rawv6_rcv_skb,
1193         .hash              = raw_v6_hash,
1194         .unhash            = raw_v6_unhash,
1195         .obj_size          = sizeof(struct raw6_sock),
1196 #ifdef CONFIG_COMPAT
1197         .compat_setsockopt = compat_rawv6_setsockopt,
1198         .compat_getsockopt = compat_rawv6_getsockopt,
1199 #endif
1200         REF_PROTO_INUSE(rawv6)
1201 };
1202
1203 #ifdef CONFIG_PROC_FS
1204 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1205 {
1206         struct ipv6_pinfo *np = inet6_sk(sp);
1207         struct in6_addr *dest, *src;
1208         __u16 destp, srcp;
1209
1210         dest  = &np->daddr;
1211         src   = &np->rcv_saddr;
1212         destp = 0;
1213         srcp  = inet_sk(sp)->num;
1214         seq_printf(seq,
1215                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1216                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1217                    i,
1218                    src->s6_addr32[0], src->s6_addr32[1],
1219                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1220                    dest->s6_addr32[0], dest->s6_addr32[1],
1221                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1222                    sp->sk_state,
1223                    atomic_read(&sp->sk_wmem_alloc),
1224                    atomic_read(&sp->sk_rmem_alloc),
1225                    0, 0L, 0,
1226                    sock_i_uid(sp), 0,
1227                    sock_i_ino(sp),
1228                    atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1229 }
1230
1231 static int raw6_seq_show(struct seq_file *seq, void *v)
1232 {
1233         if (v == SEQ_START_TOKEN)
1234                 seq_printf(seq,
1235                            "  sl  "
1236                            "local_address                         "
1237                            "remote_address                        "
1238                            "st tx_queue rx_queue tr tm->when retrnsmt"
1239                            "   uid  timeout inode  drops\n");
1240         else
1241                 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1242         return 0;
1243 }
1244
1245 static const struct seq_operations raw6_seq_ops = {
1246         .start =        raw_seq_start,
1247         .next =         raw_seq_next,
1248         .stop =         raw_seq_stop,
1249         .show =         raw6_seq_show,
1250 };
1251
1252 static int raw6_seq_open(struct inode *inode, struct file *file)
1253 {
1254         return raw_seq_open(file, &raw_v6_hashinfo, PF_INET6);
1255 }
1256
1257 static const struct file_operations raw6_seq_fops = {
1258         .owner =        THIS_MODULE,
1259         .open =         raw6_seq_open,
1260         .read =         seq_read,
1261         .llseek =       seq_lseek,
1262         .release =      seq_release_private,
1263 };
1264
1265 int __init raw6_proc_init(void)
1266 {
1267         if (!proc_net_fops_create(&init_net, "raw6", S_IRUGO, &raw6_seq_fops))
1268                 return -ENOMEM;
1269         return 0;
1270 }
1271
1272 void raw6_proc_exit(void)
1273 {
1274         proc_net_remove(&init_net, "raw6");
1275 }
1276 #endif  /* CONFIG_PROC_FS */
1277
1278 /* Same as inet6_dgram_ops, sans udp_poll.  */
1279 static const struct proto_ops inet6_sockraw_ops = {
1280         .family            = PF_INET6,
1281         .owner             = THIS_MODULE,
1282         .release           = inet6_release,
1283         .bind              = inet6_bind,
1284         .connect           = inet_dgram_connect,        /* ok           */
1285         .socketpair        = sock_no_socketpair,        /* a do nothing */
1286         .accept            = sock_no_accept,            /* a do nothing */
1287         .getname           = inet6_getname,
1288         .poll              = datagram_poll,             /* ok           */
1289         .ioctl             = inet6_ioctl,               /* must change  */
1290         .listen            = sock_no_listen,            /* ok           */
1291         .shutdown          = inet_shutdown,             /* ok           */
1292         .setsockopt        = sock_common_setsockopt,    /* ok           */
1293         .getsockopt        = sock_common_getsockopt,    /* ok           */
1294         .sendmsg           = inet_sendmsg,              /* ok           */
1295         .recvmsg           = sock_common_recvmsg,       /* ok           */
1296         .mmap              = sock_no_mmap,
1297         .sendpage          = sock_no_sendpage,
1298 #ifdef CONFIG_COMPAT
1299         .compat_setsockopt = compat_sock_common_setsockopt,
1300         .compat_getsockopt = compat_sock_common_getsockopt,
1301 #endif
1302 };
1303
1304 static struct inet_protosw rawv6_protosw = {
1305         .type           = SOCK_RAW,
1306         .protocol       = IPPROTO_IP,   /* wild card */
1307         .prot           = &rawv6_prot,
1308         .ops            = &inet6_sockraw_ops,
1309         .capability     = CAP_NET_RAW,
1310         .no_check       = UDP_CSUM_DEFAULT,
1311         .flags          = INET_PROTOSW_REUSE,
1312 };
1313
1314 int __init rawv6_init(void)
1315 {
1316         int ret;
1317
1318         ret = inet6_register_protosw(&rawv6_protosw);
1319         if (ret)
1320                 goto out;
1321 out:
1322         return ret;
1323 }
1324
1325 void rawv6_exit(void)
1326 {
1327         inet6_unregister_protosw(&rawv6_protosw);
1328 }