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 <asm/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, 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                 struct iphdr *iph = (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         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 = (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 = (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, void *from, size_t length,
 318                         struct rtable **rtp,
 319                         unsigned int flags)
 320 {
 321         struct inet_sock *inet = inet_sk(sk);
 322         struct net *net = sock_net(sk);
 323         struct iphdr *iph;
 324         struct sk_buff *skb;
 325         unsigned int iphlen;
 326         int err;
 327         struct rtable *rt = *rtp;
 328
 329         if (length > rt->dst.dev->mtu) {
 330                 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->inet_dport,
 331                                rt->dst.dev->mtu);
 332                 return -EMSGSIZE;
 333         }
 334         if (flags&MSG_PROBE)
 335                 goto out;
 336
 337         skb = sock_alloc_send_skb(sk,
 338                                   length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15,
 339                                   flags & MSG_DONTWAIT, &err);
 340         if (skb == NULL)
 341                 goto error;
 342         skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev));
 343
 344         skb->priority = sk->sk_priority;
 345         skb->mark = sk->sk_mark;
 346         skb_dst_set(skb, &rt->dst);
 347         *rtp = NULL;
 348
 349         skb_reset_network_header(skb);
 350         iph = ip_hdr(skb);
 351         skb_put(skb, length);
 352
 353         skb->ip_summed = CHECKSUM_NONE;
 354
 355         skb->transport_header = skb->network_header;
 356         err = -EFAULT;
 357         if (memcpy_fromiovecend((void *)iph, from, 0, length))
 358                 goto error_free;
 359
 360         iphlen = iph->ihl * 4;
 361
 362         /*
 363          * We don't want to modify the ip header, but we do need to
 364          * be sure that it won't cause problems later along the network
 365          * stack.  Specifically we want to make sure that iph->ihl is a
 366          * sane value.  If ihl points beyond the length of the buffer passed
 367          * in, reject the frame as invalid
 368          */
 369         err = -EINVAL;
 370         if (iphlen > length)
 371                 goto error_free;
 372
 373         if (iphlen >= sizeof(*iph)) {
 374                 if (!iph->saddr)
 375                         iph->saddr = rt->rt_src;
 376                 iph->check   = 0;
 377                 iph->tot_len = htons(length);
 378                 if (!iph->id)
 379                         ip_select_ident(iph, &rt->dst, NULL);
 380
 381                 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 382         }
 383         if (iph->protocol == IPPROTO_ICMP)
 384                 icmp_out_count(net, ((struct icmphdr *)
 385                         skb_transport_header(skb))->type);
 386
 387         err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
 388                       rt->dst.dev, dst_output);
 389         if (err > 0)
 390                 err = net_xmit_errno(err);
 391         if (err)
 392                 goto error;
 393 out:
 394         return 0;
 395
 396 error_free:
 397         kfree_skb(skb);
 398 error:
 399         IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
 400         if (err == -ENOBUFS && !inet->recverr)
 401                 err = 0;
 402         return err;
 403 }
 404
 405 static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg)
 406 {
 407         struct iovec *iov;
 408         u8 __user *type = NULL;
 409         u8 __user *code = NULL;
 410         int probed = 0;
 411         unsigned int i;
 412
 413         if (!msg->msg_iov)
 414                 return 0;
 415
 416         for (i = 0; i < msg->msg_iovlen; i++) {
 417                 iov = &msg->msg_iov[i];
 418                 if (!iov)
 419                         continue;
 420
 421                 switch (fl4->flowi4_proto) {
 422                 case IPPROTO_ICMP:
 423                         /* check if one-byte field is readable or not. */
 424                         if (iov->iov_base && iov->iov_len < 1)
 425                                 break;
 426
 427                         if (!type) {
 428                                 type = iov->iov_base;
 429                                 /* check if code field is readable or not. */
 430                                 if (iov->iov_len > 1)
 431                                         code = type + 1;
 432                         } else if (!code)
 433                                 code = iov->iov_base;
 434
 435                         if (type && code) {
 436                                 if (get_user(fl4->fl4_icmp_type, type) ||
 437                                     get_user(fl4->fl4_icmp_code, code))
 438                                         return -EFAULT;
 439                                 probed = 1;
 440                         }
 441                         break;
 442                 default:
 443                         probed = 1;
 444                         break;
 445                 }
 446                 if (probed)
 447                         break;
 448         }
 449         return 0;
 450 }
 451
 452 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 453                        size_t len)
 454 {
 455         struct inet_sock *inet = inet_sk(sk);
 456         struct ipcm_cookie ipc;
 457         struct rtable *rt = NULL;
 458         int free = 0;
 459         __be32 daddr;
 460         __be32 saddr;
 461         u8  tos;
 462         int err;
 463
 464         err = -EMSGSIZE;
 465         if (len > 0xFFFF)
 466                 goto out;
 467
 468         /*
 469          *      Check the flags.
 470          */
 471
 472         err = -EOPNOTSUPP;
 473         if (msg->msg_flags & MSG_OOB)   /* Mirror BSD error message */
 474                 goto out;               /* compatibility */
 475
 476         /*
 477          *      Get and verify the address.
 478          */
 479
 480         if (msg->msg_namelen) {
 481                 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
 482                 err = -EINVAL;
 483                 if (msg->msg_namelen < sizeof(*usin))
 484                         goto out;
 485                 if (usin->sin_family != AF_INET) {
 486                         static int complained;
 487                         if (!complained++)
 488                                 printk(KERN_INFO "%s forgot to set AF_INET in "
 489                                                  "raw sendmsg. Fix it!\n",
 490                                                  current->comm);
 491                         err = -EAFNOSUPPORT;
 492                         if (usin->sin_family)
 493                                 goto out;
 494                 }
 495                 daddr = usin->sin_addr.s_addr;
 496                 /* ANK: I did not forget to get protocol from port field.
 497                  * I just do not know, who uses this weirdness.
 498                  * IP_HDRINCL is much more convenient.
 499                  */
 500         } else {
 501                 err = -EDESTADDRREQ;
 502                 if (sk->sk_state != TCP_ESTABLISHED)
 503                         goto out;
 504                 daddr = inet->inet_daddr;
 505         }
 506
 507         ipc.addr = inet->inet_saddr;
 508         ipc.opt = NULL;
 509         ipc.tx_flags = 0;
 510         ipc.oif = sk->sk_bound_dev_if;
 511
 512         if (msg->msg_controllen) {
 513                 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
 514                 if (err)
 515                         goto out;
 516                 if (ipc.opt)
 517                         free = 1;
 518         }
 519
 520         saddr = ipc.addr;
 521         ipc.addr = daddr;
 522
 523         if (!ipc.opt)
 524                 ipc.opt = inet->opt;
 525
 526         if (ipc.opt) {
 527                 err = -EINVAL;
 528                 /* Linux does not mangle headers on raw sockets,
 529                  * so that IP options + IP_HDRINCL is non-sense.
 530                  */
 531                 if (inet->hdrincl)
 532                         goto done;
 533                 if (ipc.opt->srr) {
 534                         if (!daddr)
 535                                 goto done;
 536                         daddr = ipc.opt->faddr;
 537                 }
 538         }
 539         tos = RT_CONN_FLAGS(sk);
 540         if (msg->msg_flags & MSG_DONTROUTE)
 541                 tos |= RTO_ONLINK;
 542
 543         if (ipv4_is_multicast(daddr)) {
 544                 if (!ipc.oif)
 545                         ipc.oif = inet->mc_index;
 546                 if (!saddr)
 547                         saddr = inet->mc_addr;
 548         }
 549
 550         {
 551                 struct flowi4 fl4 = {
 552                         .flowi4_oif = ipc.oif,
 553                         .flowi4_mark = sk->sk_mark,
 554                         .daddr = daddr,
 555                         .saddr = saddr,
 556                         .flowi4_tos = tos,
 557                         .flowi4_proto = (inet->hdrincl ?
 558                                          IPPROTO_RAW :
 559                                          sk->sk_protocol),
 560                         .flowi4_flags = FLOWI_FLAG_CAN_SLEEP,
 561                 };
 562                 if (!inet->hdrincl) {
 563                         err = raw_probe_proto_opt(&fl4, msg);
 564                         if (err)
 565                                 goto done;
 566                 }
 567
 568                 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
 569                 rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
 570                 if (IS_ERR(rt)) {
 571                         err = PTR_ERR(rt);
 572                         goto done;
 573                 }
 574         }
 575
 576         err = -EACCES;
 577         if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
 578                 goto done;
 579
 580         if (msg->msg_flags & MSG_CONFIRM)
 581                 goto do_confirm;
 582 back_from_confirm:
 583
 584         if (inet->hdrincl)
 585                 err = raw_send_hdrinc(sk, msg->msg_iov, len,
 586                                         &rt, msg->msg_flags);
 587
 588          else {
 589                 if (!ipc.addr)
 590                         ipc.addr = rt->rt_dst;
 591                 lock_sock(sk);
 592                 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
 593                                         &ipc, &rt, msg->msg_flags);
 594                 if (err)
 595                         ip_flush_pending_frames(sk);
 596                 else if (!(msg->msg_flags & MSG_MORE)) {
 597                         err = ip_push_pending_frames(sk);
 598                         if (err == -ENOBUFS && !inet->recverr)
 599                                 err = 0;
 600                 }
 601                 release_sock(sk);
 602         }
 603 done:
 604         if (free)
 605                 kfree(ipc.opt);
 606         ip_rt_put(rt);
 607
 608 out:
 609         if (err < 0)
 610                 return err;
 611         return len;
 612
 613 do_confirm:
 614         dst_confirm(&rt->dst);
 615         if (!(msg->msg_flags & MSG_PROBE) || len)
 616                 goto back_from_confirm;
 617         err = 0;
 618         goto done;
 619 }
 620
 621 static void raw_close(struct sock *sk, long timeout)
 622 {
 623         /*
 624          * Raw sockets may have direct kernel refereneces. Kill them.
 625          */
 626         ip_ra_control(sk, 0, NULL);
 627
 628         sk_common_release(sk);
 629 }
 630
 631 static void raw_destroy(struct sock *sk)
 632 {
 633         lock_sock(sk);
 634         ip_flush_pending_frames(sk);
 635         release_sock(sk);
 636 }
 637
 638 /* This gets rid of all the nasties in af_inet. -DaveM */
 639 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 640 {
 641         struct inet_sock *inet = inet_sk(sk);
 642         struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
 643         int ret = -EINVAL;
 644         int chk_addr_ret;
 645
 646         if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
 647                 goto out;
 648         chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
 649         ret = -EADDRNOTAVAIL;
 650         if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
 651             chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
 652                 goto out;
 653         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 654         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 655                 inet->inet_saddr = 0;  /* Use device */
 656         sk_dst_reset(sk);
 657         ret = 0;
 658 out:    return ret;
 659 }
 660
 661 /*
 662  *      This should be easy, if there is something there
 663  *      we return it, otherwise we block.
 664  */
 665
 666 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 667                        size_t len, int noblock, int flags, int *addr_len)
 668 {
 669         struct inet_sock *inet = inet_sk(sk);
 670         size_t copied = 0;
 671         int err = -EOPNOTSUPP;
 672         struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
 673         struct sk_buff *skb;
 674
 675         if (flags & MSG_OOB)
 676                 goto out;
 677
 678         if (addr_len)
 679                 *addr_len = sizeof(*sin);
 680
 681         if (flags & MSG_ERRQUEUE) {
 682                 err = ip_recv_error(sk, msg, len);
 683                 goto out;
 684         }
 685
 686         skb = skb_recv_datagram(sk, flags, noblock, &err);
 687         if (!skb)
 688                 goto out;
 689
 690         copied = skb->len;
 691         if (len < copied) {
 692                 msg->msg_flags |= MSG_TRUNC;
 693                 copied = len;
 694         }
 695
 696         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 697         if (err)
 698                 goto done;
 699
 700         sock_recv_ts_and_drops(msg, sk, skb);
 701
 702         /* Copy the address. */
 703         if (sin) {
 704                 sin->sin_family = AF_INET;
 705                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 706                 sin->sin_port = 0;
 707                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 708         }
 709         if (inet->cmsg_flags)
 710                 ip_cmsg_recv(msg, skb);
 711         if (flags & MSG_TRUNC)
 712                 copied = skb->len;
 713 done:
 714         skb_free_datagram(sk, skb);
 715 out:
 716         if (err)
 717                 return err;
 718         return copied;
 719 }
 720
 721 static int raw_init(struct sock *sk)
 722 {
 723         struct raw_sock *rp = raw_sk(sk);
 724
 725         if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
 726                 memset(&rp->filter, 0, sizeof(rp->filter));
 727         return 0;
 728 }
 729
 730 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
 731 {
 732         if (optlen > sizeof(struct icmp_filter))
 733                 optlen = sizeof(struct icmp_filter);
 734         if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
 735                 return -EFAULT;
 736         return 0;
 737 }
 738
 739 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
 740 {
 741         int len, ret = -EFAULT;
 742
 743         if (get_user(len, optlen))
 744                 goto out;
 745         ret = -EINVAL;
 746         if (len < 0)
 747                 goto out;
 748         if (len > sizeof(struct icmp_filter))
 749                 len = sizeof(struct icmp_filter);
 750         ret = -EFAULT;
 751         if (put_user(len, optlen) ||
 752             copy_to_user(optval, &raw_sk(sk)->filter, len))
 753                 goto out;
 754         ret = 0;
 755 out:    return ret;
 756 }
 757
 758 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
 759                           char __user *optval, unsigned int optlen)
 760 {
 761         if (optname == ICMP_FILTER) {
 762                 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 763                         return -EOPNOTSUPP;
 764                 else
 765                         return raw_seticmpfilter(sk, optval, optlen);
 766         }
 767         return -ENOPROTOOPT;
 768 }
 769
 770 static int raw_setsockopt(struct sock *sk, int level, int optname,
 771                           char __user *optval, unsigned int optlen)
 772 {
 773         if (level != SOL_RAW)
 774                 return ip_setsockopt(sk, level, optname, optval, optlen);
 775         return do_raw_setsockopt(sk, level, optname, optval, optlen);
 776 }
 777
 778 #ifdef CONFIG_COMPAT
 779 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
 780                                  char __user *optval, unsigned int optlen)
 781 {
 782         if (level != SOL_RAW)
 783                 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
 784         return do_raw_setsockopt(sk, level, optname, optval, optlen);
 785 }
 786 #endif
 787
 788 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
 789                           char __user *optval, int __user *optlen)
 790 {
 791         if (optname == ICMP_FILTER) {
 792                 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 793                         return -EOPNOTSUPP;
 794                 else
 795                         return raw_geticmpfilter(sk, optval, optlen);
 796         }
 797         return -ENOPROTOOPT;
 798 }
 799
 800 static int raw_getsockopt(struct sock *sk, int level, int optname,
 801                           char __user *optval, int __user *optlen)
 802 {
 803         if (level != SOL_RAW)
 804                 return ip_getsockopt(sk, level, optname, optval, optlen);
 805         return do_raw_getsockopt(sk, level, optname, optval, optlen);
 806 }
 807
 808 #ifdef CONFIG_COMPAT
 809 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
 810                                  char __user *optval, int __user *optlen)
 811 {
 812         if (level != SOL_RAW)
 813                 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
 814         return do_raw_getsockopt(sk, level, optname, optval, optlen);
 815 }
 816 #endif
 817
 818 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
 819 {
 820         switch (cmd) {
 821                 case SIOCOUTQ: {
 822                         int amount = sk_wmem_alloc_get(sk);
 823
 824                         return put_user(amount, (int __user *)arg);
 825                 }
 826                 case SIOCINQ: {
 827                         struct sk_buff *skb;
 828                         int amount = 0;
 829
 830                         spin_lock_bh(&sk->sk_receive_queue.lock);
 831                         skb = skb_peek(&sk->sk_receive_queue);
 832                         if (skb != NULL)
 833                                 amount = skb->len;
 834                         spin_unlock_bh(&sk->sk_receive_queue.lock);
 835                         return put_user(amount, (int __user *)arg);
 836                 }
 837
 838                 default:
 839 #ifdef CONFIG_IP_MROUTE
 840                         return ipmr_ioctl(sk, cmd, (void __user *)arg);
 841 #else
 842                         return -ENOIOCTLCMD;
 843 #endif
 844         }
 845 }
 846
 847 #ifdef CONFIG_COMPAT
 848 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 849 {
 850         switch (cmd) {
 851         case SIOCOUTQ:
 852         case SIOCINQ:
 853                 return -ENOIOCTLCMD;
 854         default:
 855 #ifdef CONFIG_IP_MROUTE
 856                 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
 857 #else
 858                 return -ENOIOCTLCMD;
 859 #endif
 860         }
 861 }
 862 #endif
 863
 864 struct proto raw_prot = {
 865         .name              = "RAW",
 866         .owner             = THIS_MODULE,
 867         .close             = raw_close,
 868         .destroy           = raw_destroy,
 869         .connect           = ip4_datagram_connect,
 870         .disconnect        = udp_disconnect,
 871         .ioctl             = raw_ioctl,
 872         .init              = raw_init,
 873         .setsockopt        = raw_setsockopt,
 874         .getsockopt        = raw_getsockopt,
 875         .sendmsg           = raw_sendmsg,
 876         .recvmsg           = raw_recvmsg,
 877         .bind              = raw_bind,
 878         .backlog_rcv       = raw_rcv_skb,
 879         .hash              = raw_hash_sk,
 880         .unhash            = raw_unhash_sk,
 881         .obj_size          = sizeof(struct raw_sock),
 882         .h.raw_hash        = &raw_v4_hashinfo,
 883 #ifdef CONFIG_COMPAT
 884         .compat_setsockopt = compat_raw_setsockopt,
 885         .compat_getsockopt = compat_raw_getsockopt,
 886         .compat_ioctl      = compat_raw_ioctl,
 887 #endif
 888 };
 889
 890 #ifdef CONFIG_PROC_FS
 891 static struct sock *raw_get_first(struct seq_file *seq)
 892 {
 893         struct sock *sk;
 894         struct raw_iter_state *state = raw_seq_private(seq);
 895
 896         for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
 897                         ++state->bucket) {
 898                 struct hlist_node *node;
 899
 900                 sk_for_each(sk, node, &state->h->ht[state->bucket])
 901                         if (sock_net(sk) == seq_file_net(seq))
 902                                 goto found;
 903         }
 904         sk = NULL;
 905 found:
 906         return sk;
 907 }
 908
 909 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
 910 {
 911         struct raw_iter_state *state = raw_seq_private(seq);
 912
 913         do {
 914                 sk = sk_next(sk);
 915 try_again:
 916                 ;
 917         } while (sk && sock_net(sk) != seq_file_net(seq));
 918
 919         if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
 920                 sk = sk_head(&state->h->ht[state->bucket]);
 921                 goto try_again;
 922         }
 923         return sk;
 924 }
 925
 926 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
 927 {
 928         struct sock *sk = raw_get_first(seq);
 929
 930         if (sk)
 931                 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
 932                         --pos;
 933         return pos ? NULL : sk;
 934 }
 935
 936 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
 937 {
 938         struct raw_iter_state *state = raw_seq_private(seq);
 939
 940         read_lock(&state->h->lock);
 941         return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 942 }
 943 EXPORT_SYMBOL_GPL(raw_seq_start);
 944
 945 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 946 {
 947         struct sock *sk;
 948
 949         if (v == SEQ_START_TOKEN)
 950                 sk = raw_get_first(seq);
 951         else
 952                 sk = raw_get_next(seq, v);
 953         ++*pos;
 954         return sk;
 955 }
 956 EXPORT_SYMBOL_GPL(raw_seq_next);
 957
 958 void raw_seq_stop(struct seq_file *seq, void *v)
 959 {
 960         struct raw_iter_state *state = raw_seq_private(seq);
 961
 962         read_unlock(&state->h->lock);
 963 }
 964 EXPORT_SYMBOL_GPL(raw_seq_stop);
 965
 966 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
 967 {
 968         struct inet_sock *inet = inet_sk(sp);
 969         __be32 dest = inet->inet_daddr,
 970                src = inet->inet_rcv_saddr;
 971         __u16 destp = 0,
 972               srcp  = inet->inet_num;
 973
 974         seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
 975                 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
 976                 i, src, srcp, dest, destp, sp->sk_state,
 977                 sk_wmem_alloc_get(sp),
 978                 sk_rmem_alloc_get(sp),
 979                 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
 980                 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
 981 }
 982
 983 static int raw_seq_show(struct seq_file *seq, void *v)
 984 {
 985         if (v == SEQ_START_TOKEN)
 986                 seq_printf(seq, "  sl  local_address rem_address   st tx_queue "
 987                                 "rx_queue tr tm->when retrnsmt   uid  timeout "
 988                                 "inode ref pointer drops\n");
 989         else
 990                 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
 991         return 0;
 992 }
 993
 994 static const struct seq_operations raw_seq_ops = {
 995         .start = raw_seq_start,
 996         .next  = raw_seq_next,
 997         .stop  = raw_seq_stop,
 998         .show  = raw_seq_show,
 999 };
1000
1001 int raw_seq_open(struct inode *ino, struct file *file,
1002                  struct raw_hashinfo *h, const struct seq_operations *ops)
1003 {
1004         int err;
1005         struct raw_iter_state *i;
1006
1007         err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1008         if (err < 0)
1009                 return err;
1010
1011         i = raw_seq_private((struct seq_file *)file->private_data);
1012         i->h = h;
1013         return 0;
1014 }
1015 EXPORT_SYMBOL_GPL(raw_seq_open);
1016
1017 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1018 {
1019         return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1020 }
1021
1022 static const struct file_operations raw_seq_fops = {
1023         .owner   = THIS_MODULE,
1024         .open    = raw_v4_seq_open,
1025         .read    = seq_read,
1026         .llseek  = seq_lseek,
1027         .release = seq_release_net,
1028 };
1029
1030 static __net_init int raw_init_net(struct net *net)
1031 {
1032         if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
1033                 return -ENOMEM;
1034
1035         return 0;
1036 }
1037
1038 static __net_exit void raw_exit_net(struct net *net)
1039 {
1040         proc_net_remove(net, "raw");
1041 }
1042
1043 static __net_initdata struct pernet_operations raw_net_ops = {
1044         .init = raw_init_net,
1045         .exit = raw_exit_net,
1046 };
1047
1048 int __init raw_proc_init(void)
1049 {
1050         return register_pernet_subsys(&raw_net_ops);
1051 }
1052
1053 void __init raw_proc_exit(void)
1054 {
1055         unregister_pernet_subsys(&raw_net_ops);
1056 }
1057 #endif /* CONFIG_PROC_FS */