net/ipv4/raw.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              RAW - implementation of IP "raw" sockets.
   7  *
   8  * Authors:     Ross Biro
   9  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  10  *
  11  * Fixes:
  12  *              Alan Cox        :       verify_area() fixed up
  13  *              Alan Cox        :       ICMP error handling
  14  *              Alan Cox        :       EMSGSIZE if you send too big a packet
  15  *              Alan Cox        :       Now uses generic datagrams and shared
  16  *                                      skbuff library. No more peek crashes,
  17  *                                      no more backlogs
  18  *              Alan Cox        :       Checks sk->broadcast.
  19  *              Alan Cox        :       Uses skb_free_datagram/skb_copy_datagram
  20  *              Alan Cox        :       Raw passes ip options too
  21  *              Alan Cox        :       Setsocketopt added
  22  *              Alan Cox        :       Fixed error return for broadcasts
  23  *              Alan Cox        :       Removed wake_up calls
  24  *              Alan Cox        :       Use ttl/tos
  25  *              Alan Cox        :       Cleaned up old debugging
  26  *              Alan Cox        :       Use new kernel side addresses
  27  *      Arnt Gulbrandsen        :       Fixed MSG_DONTROUTE in raw sockets.
  28  *              Alan Cox        :       BSD style RAW socket demultiplexing.
  29  *              Alan Cox        :       Beginnings of mrouted support.
  30  *              Alan Cox        :       Added IP_HDRINCL option.
  31  *              Alan Cox        :       Skip broadcast check if BSDism set.
  32  *              David S. Miller :       New socket lookup architecture.
  33  *
  34  *              This program is free software; you can redistribute it and/or
  35  *              modify it under the terms of the GNU General Public License
  36  *              as published by the Free Software Foundation; either version
  37  *              2 of the License, or (at your option) any later version.
  38  */
  39
  40 #include <linux/types.h>
  41 #include <linux/atomic.h>
  42 #include <asm/byteorder.h>
  43 #include <asm/current.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/ioctls.h>
  46 #include <linux/stddef.h>
  47 #include <linux/slab.h>
  48 #include <linux/errno.h>
  49 #include <linux/aio.h>
  50 #include <linux/kernel.h>
  51 #include <linux/spinlock.h>
  52 #include <linux/sockios.h>
  53 #include <linux/socket.h>
  54 #include <linux/in.h>
  55 #include <linux/mroute.h>
  56 #include <linux/netdevice.h>
  57 #include <linux/in_route.h>
  58 #include <linux/route.h>
  59 #include <linux/skbuff.h>
  60 #include <net/net_namespace.h>
  61 #include <net/dst.h>
  62 #include <net/sock.h>
  63 #include <linux/ip.h>
  64 #include <linux/net.h>
  65 #include <net/ip.h>
  66 #include <net/icmp.h>
  67 #include <net/udp.h>
  68 #include <net/raw.h>
  69 #include <net/snmp.h>
  70 #include <net/tcp_states.h>
  71 #include <net/inet_common.h>
  72 #include <net/checksum.h>
  73 #include <net/xfrm.h>
  74 #include <linux/rtnetlink.h>
  75 #include <linux/proc_fs.h>
  76 #include <linux/seq_file.h>
  77 #include <linux/netfilter.h>
  78 #include <linux/netfilter_ipv4.h>
  79 #include <linux/compat.h>
  80
  81 static struct raw_hashinfo raw_v4_hashinfo = {
  82         .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
  83 };
  84
  85 void raw_hash_sk(struct sock *sk)
  86 {
  87         struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
  88         struct hlist_head *head;
  89
  90         head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
  91
  92         write_lock_bh(&h->lock);
  93         sk_add_node(sk, head);
  94         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  95         write_unlock_bh(&h->lock);
  96 }
  97 EXPORT_SYMBOL_GPL(raw_hash_sk);
  98
  99 void raw_unhash_sk(struct sock *sk)
 100 {
 101         struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
 102
 103         write_lock_bh(&h->lock);
 104         if (sk_del_node_init(sk))
 105                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 106         write_unlock_bh(&h->lock);
 107 }
 108 EXPORT_SYMBOL_GPL(raw_unhash_sk);
 109
 110 static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
 111                 unsigned short num, __be32 raddr, __be32 laddr, int dif)
 112 {
 113         struct hlist_node *node;
 114
 115         sk_for_each_from(sk, node) {
 116                 struct inet_sock *inet = inet_sk(sk);
 117
 118                 if (net_eq(sock_net(sk), net) && inet->inet_num == num  &&
 119                     !(inet->inet_daddr && inet->inet_daddr != raddr)    &&
 120                     !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
 121                     !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
 122                         goto found; /* gotcha */
 123         }
 124         sk = NULL;
 125 found:
 126         return sk;
 127 }
 128
 129 /*
 130  *      0 - deliver
 131  *      1 - block
 132  */
 133 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
 134 {
 135         int type;
 136
 137         if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
 138                 return 1;
 139
 140         type = icmp_hdr(skb)->type;
 141         if (type < 32) {
 142                 __u32 data = raw_sk(sk)->filter.data;
 143
 144                 return ((1 << type) & data) != 0;
 145         }
 146
 147         /* Do not block unknown ICMP types */
 148         return 0;
 149 }
 150
 151 /* IP input processing comes here for RAW socket delivery.
 152  * Caller owns SKB, so we must make clones.
 153  *
 154  * RFC 1122: SHOULD pass TOS value up to the transport layer.
 155  * -> It does. And not only TOS, but all IP header.
 156  */
 157 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 158 {
 159         struct sock *sk;
 160         struct hlist_head *head;
 161         int delivered = 0;
 162         struct net *net;
 163
 164         read_lock(&raw_v4_hashinfo.lock);
 165         head = &raw_v4_hashinfo.ht[hash];
 166         if (hlist_empty(head))
 167                 goto out;
 168
 169         net = dev_net(skb->dev);
 170         sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
 171                              iph->saddr, iph->daddr,
 172                              skb->dev->ifindex);
 173
 174         while (sk) {
 175                 delivered = 1;
 176                 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
 177                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 178
 179                         /* Not releasing hash table! */
 180                         if (clone)
 181                                 raw_rcv(sk, clone);
 182                 }
 183                 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
 184                                      iph->saddr, iph->daddr,
 185                                      skb->dev->ifindex);
 186         }
 187 out:
 188         read_unlock(&raw_v4_hashinfo.lock);
 189         return delivered;
 190 }
 191
 192 int raw_local_deliver(struct sk_buff *skb, int protocol)
 193 {
 194         int hash;
 195         struct sock *raw_sk;
 196
 197         hash = protocol & (RAW_HTABLE_SIZE - 1);
 198         raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 199
 200         /* If there maybe a raw socket we must check - if not we
 201          * don't care less
 202          */
 203         if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
 204                 raw_sk = NULL;
 205
 206         return raw_sk != NULL;
 207
 208 }
 209
 210 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
 211 {
 212         struct inet_sock *inet = inet_sk(sk);
 213         const int type = icmp_hdr(skb)->type;
 214         const int code = icmp_hdr(skb)->code;
 215         int err = 0;
 216         int harderr = 0;
 217
 218         /* Report error on raw socket, if:
 219            1. User requested ip_recverr.
 220            2. Socket is connected (otherwise the error indication
 221               is useless without ip_recverr and error is hard.
 222          */
 223         if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
 224                 return;
 225
 226         switch (type) {
 227         default:
 228         case ICMP_TIME_EXCEEDED:
 229                 err = EHOSTUNREACH;
 230                 break;
 231         case ICMP_SOURCE_QUENCH:
 232                 return;
 233         case ICMP_PARAMETERPROB:
 234                 err = EPROTO;
 235                 harderr = 1;
 236                 break;
 237         case ICMP_DEST_UNREACH:
 238                 err = EHOSTUNREACH;
 239                 if (code > NR_ICMP_UNREACH)
 240                         break;
 241                 err = icmp_err_convert[code].errno;
 242                 harderr = icmp_err_convert[code].fatal;
 243                 if (code == ICMP_FRAG_NEEDED) {
 244                         harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
 245                         err = EMSGSIZE;
 246                 }
 247         }
 248
 249         if (inet->recverr) {
 250                 const struct iphdr *iph = (const struct iphdr *)skb->data;
 251                 u8 *payload = skb->data + (iph->ihl << 2);
 252
 253                 if (inet->hdrincl)
 254                         payload = skb->data;
 255                 ip_icmp_error(sk, skb, err, 0, info, payload);
 256         }
 257
 258         if (inet->recverr || harderr) {
 259                 sk->sk_err = err;
 260                 sk->sk_error_report(sk);
 261         }
 262 }
 263
 264 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
 265 {
 266         int hash;
 267         struct sock *raw_sk;
 268         const struct iphdr *iph;
 269         struct net *net;
 270
 271         hash = protocol & (RAW_HTABLE_SIZE - 1);
 272
 273         read_lock(&raw_v4_hashinfo.lock);
 274         raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 275         if (raw_sk != NULL) {
 276                 iph = (const struct iphdr *)skb->data;
 277                 net = dev_net(skb->dev);
 278
 279                 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
 280                                                 iph->daddr, iph->saddr,
 281                                                 skb->dev->ifindex)) != NULL) {
 282                         raw_err(raw_sk, skb, info);
 283                         raw_sk = sk_next(raw_sk);
 284                         iph = (const struct iphdr *)skb->data;
 285                 }
 286         }
 287         read_unlock(&raw_v4_hashinfo.lock);
 288 }
 289
 290 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
 291 {
 292         /* Charge it to the socket. */
 293
 294         if (ip_queue_rcv_skb(sk, skb) < 0) {
 295                 kfree_skb(skb);
 296                 return NET_RX_DROP;
 297         }
 298
 299         return NET_RX_SUCCESS;
 300 }
 301
 302 int raw_rcv(struct sock *sk, struct sk_buff *skb)
 303 {
 304         if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
 305                 atomic_inc(&sk->sk_drops);
 306                 kfree_skb(skb);
 307                 return NET_RX_DROP;
 308         }
 309         nf_reset(skb);
 310
 311         skb_push(skb, skb->data - skb_network_header(skb));
 312
 313         raw_rcv_skb(sk, skb);
 314         return 0;
 315 }
 316
 317 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
 318                            void *from, size_t length,
 319                            struct rtable **rtp,
 320                            unsigned int flags)
 321 {
 322         struct inet_sock *inet = inet_sk(sk);
 323         struct net *net = sock_net(sk);
 324         struct iphdr *iph;
 325         struct sk_buff *skb;
 326         unsigned int iphlen;
 327         int err;
 328         struct rtable *rt = *rtp;
 329
 330         if (length > rt->dst.dev->mtu) {
 331                 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
 332                                rt->dst.dev->mtu);
 333                 return -EMSGSIZE;
 334         }
 335         if (flags&MSG_PROBE)
 336                 goto out;
 337
 338         skb = sock_alloc_send_skb(sk,
 339                                   length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15,
 340                                   flags & MSG_DONTWAIT, &err);
 341         if (skb == NULL)
 342                 goto error;
 343         skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev));
 344
 345         skb->priority = sk->sk_priority;
 346         skb->mark = sk->sk_mark;
 347         skb_dst_set(skb, &rt->dst);
 348         *rtp = NULL;
 349
 350         skb_reset_network_header(skb);
 351         iph = ip_hdr(skb);
 352         skb_put(skb, length);
 353
 354         skb->ip_summed = CHECKSUM_NONE;
 355
 356         skb->transport_header = skb->network_header;
 357         err = -EFAULT;
 358         if (memcpy_fromiovecend((void *)iph, from, 0, length))
 359                 goto error_free;
 360
 361         iphlen = iph->ihl * 4;
 362
 363         /*
 364          * We don't want to modify the ip header, but we do need to
 365          * be sure that it won't cause problems later along the network
 366          * stack.  Specifically we want to make sure that iph->ihl is a
 367          * sane value.  If ihl points beyond the length of the buffer passed
 368          * in, reject the frame as invalid
 369          */
 370         err = -EINVAL;
 371         if (iphlen > length)
 372                 goto error_free;
 373
 374         if (iphlen >= sizeof(*iph)) {
 375                 if (!iph->saddr)
 376                         iph->saddr = fl4->saddr;
 377                 iph->check   = 0;
 378                 iph->tot_len = htons(length);
 379                 if (!iph->id)
 380                         ip_select_ident(iph, &rt->dst, NULL);
 381
 382                 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 383         }
 384         if (iph->protocol == IPPROTO_ICMP)
 385                 icmp_out_count(net, ((struct icmphdr *)
 386                         skb_transport_header(skb))->type);
 387
 388         err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
 389                       rt->dst.dev, dst_output);
 390         if (err > 0)
 391                 err = net_xmit_errno(err);
 392         if (err)
 393                 goto error;
 394 out:
 395         return 0;
 396
 397 error_free:
 398         kfree_skb(skb);
 399 error:
 400         IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
 401         if (err == -ENOBUFS && !inet->recverr)
 402                 err = 0;
 403         return err;
 404 }
 405
 406 static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg)
 407 {
 408         struct iovec *iov;
 409         u8 __user *type = NULL;
 410         u8 __user *code = NULL;
 411         int probed = 0;
 412         unsigned int i;
 413
 414         if (!msg->msg_iov)
 415                 return 0;
 416
 417         for (i = 0; i < msg->msg_iovlen; i++) {
 418                 iov = &msg->msg_iov[i];
 419                 if (!iov)
 420                         continue;
 421
 422                 switch (fl4->flowi4_proto) {
 423                 case IPPROTO_ICMP:
 424                         /* check if one-byte field is readable or not. */
 425                         if (iov->iov_base && iov->iov_len < 1)
 426                                 break;
 427
 428                         if (!type) {
 429                                 type = iov->iov_base;
 430                                 /* check if code field is readable or not. */
 431                                 if (iov->iov_len > 1)
 432                                         code = type + 1;
 433                         } else if (!code)
 434                                 code = iov->iov_base;
 435
 436                         if (type && code) {
 437                                 if (get_user(fl4->fl4_icmp_type, type) ||
 438                                     get_user(fl4->fl4_icmp_code, code))
 439                                         return -EFAULT;
 440                                 probed = 1;
 441                         }
 442                         break;
 443                 default:
 444                         probed = 1;
 445                         break;
 446                 }
 447                 if (probed)
 448                         break;
 449         }
 450         return 0;
 451 }
 452
 453 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 454                        size_t len)
 455 {
 456         struct inet_sock *inet = inet_sk(sk);
 457         struct ipcm_cookie ipc;
 458         struct rtable *rt = NULL;
 459         struct flowi4 fl4;
 460         int free = 0;
 461         __be32 daddr;
 462         __be32 saddr;
 463         u8  tos;
 464         int err;
 465         struct ip_options_data opt_copy;
 466
 467         err = -EMSGSIZE;
 468         if (len > 0xFFFF)
 469                 goto out;
 470
 471         /*
 472          *      Check the flags.
 473          */
 474
 475         err = -EOPNOTSUPP;
 476         if (msg->msg_flags & MSG_OOB)   /* Mirror BSD error message */
 477                 goto out;               /* compatibility */
 478
 479         /*
 480          *      Get and verify the address.
 481          */
 482
 483         if (msg->msg_namelen) {
 484                 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
 485                 err = -EINVAL;
 486                 if (msg->msg_namelen < sizeof(*usin))
 487                         goto out;
 488                 if (usin->sin_family != AF_INET) {
 489                         static int complained;
 490                         if (!complained++)
 491                                 printk(KERN_INFO "%s forgot to set AF_INET in "
 492                                                  "raw sendmsg. Fix it!\n",
 493                                                  current->comm);
 494                         err = -EAFNOSUPPORT;
 495                         if (usin->sin_family)
 496                                 goto out;
 497                 }
 498                 daddr = usin->sin_addr.s_addr;
 499                 /* ANK: I did not forget to get protocol from port field.
 500                  * I just do not know, who uses this weirdness.
 501                  * IP_HDRINCL is much more convenient.
 502                  */
 503         } else {
 504                 err = -EDESTADDRREQ;
 505                 if (sk->sk_state != TCP_ESTABLISHED)
 506                         goto out;
 507                 daddr = inet->inet_daddr;
 508         }
 509
 510         ipc.addr = inet->inet_saddr;
 511         ipc.opt = NULL;
 512         ipc.tx_flags = 0;
 513         ipc.oif = sk->sk_bound_dev_if;
 514
 515         if (msg->msg_controllen) {
 516                 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
 517                 if (err)
 518                         goto out;
 519                 if (ipc.opt)
 520                         free = 1;
 521         }
 522
 523         saddr = ipc.addr;
 524         ipc.addr = daddr;
 525
 526         if (!ipc.opt) {
 527                 struct ip_options_rcu *inet_opt;
 528
 529                 rcu_read_lock();
 530                 inet_opt = rcu_dereference(inet->inet_opt);
 531                 if (inet_opt) {
 532                         memcpy(&opt_copy, inet_opt,
 533                                sizeof(*inet_opt) + inet_opt->opt.optlen);
 534                         ipc.opt = &opt_copy.opt;
 535                 }
 536                 rcu_read_unlock();
 537         }
 538
 539         if (ipc.opt) {
 540                 err = -EINVAL;
 541                 /* Linux does not mangle headers on raw sockets,
 542                  * so that IP options + IP_HDRINCL is non-sense.
 543                  */
 544                 if (inet->hdrincl)
 545                         goto done;
 546                 if (ipc.opt->opt.srr) {
 547                         if (!daddr)
 548                                 goto done;
 549                         daddr = ipc.opt->opt.faddr;
 550                 }
 551         }
 552         tos = RT_CONN_FLAGS(sk);
 553         if (msg->msg_flags & MSG_DONTROUTE)
 554                 tos |= RTO_ONLINK;
 555
 556         if (ipv4_is_multicast(daddr)) {
 557                 if (!ipc.oif)
 558                         ipc.oif = inet->mc_index;
 559                 if (!saddr)
 560                         saddr = inet->mc_addr;
 561         }
 562
 563         flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
 564                            RT_SCOPE_UNIVERSE,
 565                            inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
 566                            inet_sk_flowi_flags(sk) | FLOWI_FLAG_CAN_SLEEP,
 567                            daddr, saddr, 0, 0);
 568
 569         if (!inet->hdrincl) {
 570                 err = raw_probe_proto_opt(&fl4, msg);
 571                 if (err)
 572                         goto done;
 573         }
 574
 575         security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
 576         rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
 577         if (IS_ERR(rt)) {
 578                 err = PTR_ERR(rt);
 579                 rt = NULL;
 580                 goto done;
 581         }
 582
 583         err = -EACCES;
 584         if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
 585                 goto done;
 586
 587         if (msg->msg_flags & MSG_CONFIRM)
 588                 goto do_confirm;
 589 back_from_confirm:
 590
 591         if (inet->hdrincl)
 592                 err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
 593                                       &rt, msg->msg_flags);
 594
 595          else {
 596                 if (!ipc.addr)
 597                         ipc.addr = fl4.daddr;
 598                 lock_sock(sk);
 599                 err = ip_append_data(sk, &fl4, ip_generic_getfrag,
 600                                      msg->msg_iov, len, 0,
 601                                      &ipc, &rt, msg->msg_flags);
 602                 if (err)
 603                         ip_flush_pending_frames(sk);
 604                 else if (!(msg->msg_flags & MSG_MORE)) {
 605                         err = ip_push_pending_frames(sk, &fl4);
 606                         if (err == -ENOBUFS && !inet->recverr)
 607                                 err = 0;
 608                 }
 609                 release_sock(sk);
 610         }
 611 done:
 612         if (free)
 613                 kfree(ipc.opt);
 614         ip_rt_put(rt);
 615
 616 out:
 617         if (err < 0)
 618                 return err;
 619         return len;
 620
 621 do_confirm:
 622         dst_confirm(&rt->dst);
 623         if (!(msg->msg_flags & MSG_PROBE) || len)
 624                 goto back_from_confirm;
 625         err = 0;
 626         goto done;
 627 }
 628
 629 static void raw_close(struct sock *sk, long timeout)
 630 {
 631         /*
 632          * Raw sockets may have direct kernel references. Kill them.
 633          */
 634         ip_ra_control(sk, 0, NULL);
 635
 636         sk_common_release(sk);
 637 }
 638
 639 static void raw_destroy(struct sock *sk)
 640 {
 641         lock_sock(sk);
 642         ip_flush_pending_frames(sk);
 643         release_sock(sk);
 644 }
 645
 646 /* This gets rid of all the nasties in af_inet. -DaveM */
 647 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 648 {
 649         struct inet_sock *inet = inet_sk(sk);
 650         struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
 651         int ret = -EINVAL;
 652         int chk_addr_ret;
 653
 654         if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
 655                 goto out;
 656         chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
 657         ret = -EADDRNOTAVAIL;
 658         if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
 659             chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
 660                 goto out;
 661         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 662         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 663                 inet->inet_saddr = 0;  /* Use device */
 664         sk_dst_reset(sk);
 665         ret = 0;
 666 out:    return ret;
 667 }
 668
 669 /*
 670  *      This should be easy, if there is something there
 671  *      we return it, otherwise we block.
 672  */
 673
 674 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 675                        size_t len, int noblock, int flags, int *addr_len)
 676 {
 677         struct inet_sock *inet = inet_sk(sk);
 678         size_t copied = 0;
 679         int err = -EOPNOTSUPP;
 680         struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
 681         struct sk_buff *skb;
 682
 683         if (flags & MSG_OOB)
 684                 goto out;
 685
 686         if (addr_len)
 687                 *addr_len = sizeof(*sin);
 688
 689         if (flags & MSG_ERRQUEUE) {
 690                 err = ip_recv_error(sk, msg, len);
 691                 goto out;
 692         }
 693
 694         skb = skb_recv_datagram(sk, flags, noblock, &err);
 695         if (!skb)
 696                 goto out;
 697
 698         copied = skb->len;
 699         if (len < copied) {
 700                 msg->msg_flags |= MSG_TRUNC;
 701                 copied = len;
 702         }
 703
 704         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 705         if (err)
 706                 goto done;
 707
 708         sock_recv_ts_and_drops(msg, sk, skb);
 709
 710         /* Copy the address. */
 711         if (sin) {
 712                 sin->sin_family = AF_INET;
 713                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 714                 sin->sin_port = 0;
 715                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 716         }
 717         if (inet->cmsg_flags)
 718                 ip_cmsg_recv(msg, skb);
 719         if (flags & MSG_TRUNC)
 720                 copied = skb->len;
 721 done:
 722         skb_free_datagram(sk, skb);
 723 out:
 724         if (err)
 725                 return err;
 726         return copied;
 727 }
 728
 729 static int raw_init(struct sock *sk)
 730 {
 731         struct raw_sock *rp = raw_sk(sk);
 732
 733         if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
 734                 memset(&rp->filter, 0, sizeof(rp->filter));
 735         return 0;
 736 }
 737
 738 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
 739 {
 740         if (optlen > sizeof(struct icmp_filter))
 741                 optlen = sizeof(struct icmp_filter);
 742         if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
 743                 return -EFAULT;
 744         return 0;
 745 }
 746
 747 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
 748 {
 749         int len, ret = -EFAULT;
 750
 751         if (get_user(len, optlen))
 752                 goto out;
 753         ret = -EINVAL;
 754         if (len < 0)
 755                 goto out;
 756         if (len > sizeof(struct icmp_filter))
 757                 len = sizeof(struct icmp_filter);
 758         ret = -EFAULT;
 759         if (put_user(len, optlen) ||
 760             copy_to_user(optval, &raw_sk(sk)->filter, len))
 761                 goto out;
 762         ret = 0;
 763 out:    return ret;
 764 }
 765
 766 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
 767                           char __user *optval, unsigned int optlen)
 768 {
 769         if (optname == ICMP_FILTER) {
 770                 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 771                         return -EOPNOTSUPP;
 772                 else
 773                         return raw_seticmpfilter(sk, optval, optlen);
 774         }
 775         return -ENOPROTOOPT;
 776 }
 777
 778 static int raw_setsockopt(struct sock *sk, int level, int optname,
 779                           char __user *optval, unsigned int optlen)
 780 {
 781         if (level != SOL_RAW)
 782                 return ip_setsockopt(sk, level, optname, optval, optlen);
 783         return do_raw_setsockopt(sk, level, optname, optval, optlen);
 784 }
 785
 786 #ifdef CONFIG_COMPAT
 787 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
 788                                  char __user *optval, unsigned int optlen)
 789 {
 790         if (level != SOL_RAW)
 791                 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
 792         return do_raw_setsockopt(sk, level, optname, optval, optlen);
 793 }
 794 #endif
 795
 796 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
 797                           char __user *optval, int __user *optlen)
 798 {
 799         if (optname == ICMP_FILTER) {
 800                 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 801                         return -EOPNOTSUPP;
 802                 else
 803                         return raw_geticmpfilter(sk, optval, optlen);
 804         }
 805         return -ENOPROTOOPT;
 806 }
 807
 808 static int raw_getsockopt(struct sock *sk, int level, int optname,
 809                           char __user *optval, int __user *optlen)
 810 {
 811         if (level != SOL_RAW)
 812                 return ip_getsockopt(sk, level, optname, optval, optlen);
 813         return do_raw_getsockopt(sk, level, optname, optval, optlen);
 814 }
 815
 816 #ifdef CONFIG_COMPAT
 817 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
 818                                  char __user *optval, int __user *optlen)
 819 {
 820         if (level != SOL_RAW)
 821                 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
 822         return do_raw_getsockopt(sk, level, optname, optval, optlen);
 823 }
 824 #endif
 825
 826 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
 827 {
 828         switch (cmd) {
 829         case SIOCOUTQ: {
 830                 int amount = sk_wmem_alloc_get(sk);
 831
 832                 return put_user(amount, (int __user *)arg);
 833         }
 834         case SIOCINQ: {
 835                 struct sk_buff *skb;
 836                 int amount = 0;
 837
 838                 spin_lock_bh(&sk->sk_receive_queue.lock);
 839                 skb = skb_peek(&sk->sk_receive_queue);
 840                 if (skb != NULL)
 841                         amount = skb->len;
 842                 spin_unlock_bh(&sk->sk_receive_queue.lock);
 843                 return put_user(amount, (int __user *)arg);
 844         }
 845
 846         default:
 847 #ifdef CONFIG_IP_MROUTE
 848                 return ipmr_ioctl(sk, cmd, (void __user *)arg);
 849 #else
 850                 return -ENOIOCTLCMD;
 851 #endif
 852         }
 853 }
 854
 855 #ifdef CONFIG_COMPAT
 856 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 857 {
 858         switch (cmd) {
 859         case SIOCOUTQ:
 860         case SIOCINQ:
 861                 return -ENOIOCTLCMD;
 862         default:
 863 #ifdef CONFIG_IP_MROUTE
 864                 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
 865 #else
 866                 return -ENOIOCTLCMD;
 867 #endif
 868         }
 869 }
 870 #endif
 871
 872 struct proto raw_prot = {
 873         .name              = "RAW",
 874         .owner             = THIS_MODULE,
 875         .close             = raw_close,
 876         .destroy           = raw_destroy,
 877         .connect           = ip4_datagram_connect,
 878         .disconnect        = udp_disconnect,
 879         .ioctl             = raw_ioctl,
 880         .init              = raw_init,
 881         .setsockopt        = raw_setsockopt,
 882         .getsockopt        = raw_getsockopt,
 883         .sendmsg           = raw_sendmsg,
 884         .recvmsg           = raw_recvmsg,
 885         .bind              = raw_bind,
 886         .backlog_rcv       = raw_rcv_skb,
 887         .hash              = raw_hash_sk,
 888         .unhash            = raw_unhash_sk,
 889         .obj_size          = sizeof(struct raw_sock),
 890         .h.raw_hash        = &raw_v4_hashinfo,
 891 #ifdef CONFIG_COMPAT
 892         .compat_setsockopt = compat_raw_setsockopt,
 893         .compat_getsockopt = compat_raw_getsockopt,
 894         .compat_ioctl      = compat_raw_ioctl,
 895 #endif
 896 };
 897
 898 #ifdef CONFIG_PROC_FS
 899 static struct sock *raw_get_first(struct seq_file *seq)
 900 {
 901         struct sock *sk;
 902         struct raw_iter_state *state = raw_seq_private(seq);
 903
 904         for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
 905                         ++state->bucket) {
 906                 struct hlist_node *node;
 907
 908                 sk_for_each(sk, node, &state->h->ht[state->bucket])
 909                         if (sock_net(sk) == seq_file_net(seq))
 910                                 goto found;
 911         }
 912         sk = NULL;
 913 found:
 914         return sk;
 915 }
 916
 917 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
 918 {
 919         struct raw_iter_state *state = raw_seq_private(seq);
 920
 921         do {
 922                 sk = sk_next(sk);
 923 try_again:
 924                 ;
 925         } while (sk && sock_net(sk) != seq_file_net(seq));
 926
 927         if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
 928                 sk = sk_head(&state->h->ht[state->bucket]);
 929                 goto try_again;
 930         }
 931         return sk;
 932 }
 933
 934 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
 935 {
 936         struct sock *sk = raw_get_first(seq);
 937
 938         if (sk)
 939                 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
 940                         --pos;
 941         return pos ? NULL : sk;
 942 }
 943
 944 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
 945 {
 946         struct raw_iter_state *state = raw_seq_private(seq);
 947
 948         read_lock(&state->h->lock);
 949         return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 950 }
 951 EXPORT_SYMBOL_GPL(raw_seq_start);
 952
 953 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 954 {
 955         struct sock *sk;
 956
 957         if (v == SEQ_START_TOKEN)
 958                 sk = raw_get_first(seq);
 959         else
 960                 sk = raw_get_next(seq, v);
 961         ++*pos;
 962         return sk;
 963 }
 964 EXPORT_SYMBOL_GPL(raw_seq_next);
 965
 966 void raw_seq_stop(struct seq_file *seq, void *v)
 967 {
 968         struct raw_iter_state *state = raw_seq_private(seq);
 969
 970         read_unlock(&state->h->lock);
 971 }
 972 EXPORT_SYMBOL_GPL(raw_seq_stop);
 973
 974 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
 975 {
 976         struct inet_sock *inet = inet_sk(sp);
 977         __be32 dest = inet->inet_daddr,
 978                src = inet->inet_rcv_saddr;
 979         __u16 destp = 0,
 980               srcp  = inet->inet_num;
 981
 982         seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
 983                 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
 984                 i, src, srcp, dest, destp, sp->sk_state,
 985                 sk_wmem_alloc_get(sp),
 986                 sk_rmem_alloc_get(sp),
 987                 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
 988                 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
 989 }
 990
 991 static int raw_seq_show(struct seq_file *seq, void *v)
 992 {
 993         if (v == SEQ_START_TOKEN)
 994                 seq_printf(seq, "  sl  local_address rem_address   st tx_queue "
 995                                 "rx_queue tr tm->when retrnsmt   uid  timeout "
 996                                 "inode ref pointer drops\n");
 997         else
 998                 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
 999         return 0;
1000 }
1001
1002 static const struct seq_operations raw_seq_ops = {
1003         .start = raw_seq_start,
1004         .next  = raw_seq_next,
1005         .stop  = raw_seq_stop,
1006         .show  = raw_seq_show,
1007 };
1008
1009 int raw_seq_open(struct inode *ino, struct file *file,
1010                  struct raw_hashinfo *h, const struct seq_operations *ops)
1011 {
1012         int err;
1013         struct raw_iter_state *i;
1014
1015         err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1016         if (err < 0)
1017                 return err;
1018
1019         i = raw_seq_private((struct seq_file *)file->private_data);
1020         i->h = h;
1021         return 0;
1022 }
1023 EXPORT_SYMBOL_GPL(raw_seq_open);
1024
1025 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1026 {
1027         return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1028 }
1029
1030 static const struct file_operations raw_seq_fops = {
1031         .owner   = THIS_MODULE,
1032         .open    = raw_v4_seq_open,
1033         .read    = seq_read,
1034         .llseek  = seq_lseek,
1035         .release = seq_release_net,
1036 };
1037
1038 static __net_init int raw_init_net(struct net *net)
1039 {
1040         if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
1041                 return -ENOMEM;
1042
1043         return 0;
1044 }
1045
1046 static __net_exit void raw_exit_net(struct net *net)
1047 {
1048         proc_net_remove(net, "raw");
1049 }
1050
1051 static __net_initdata struct pernet_operations raw_net_ops = {
1052         .init = raw_init_net,
1053         .exit = raw_exit_net,
1054 };
1055
1056 int __init raw_proc_init(void)
1057 {
1058         return register_pernet_subsys(&raw_net_ops);
1059 }
1060
1061 void __init raw_proc_exit(void)
1062 {
1063         unregister_pernet_subsys(&raw_net_ops);
1064 }
1065 #endif /* CONFIG_PROC_FS */