linux/net/ipv4/raw.c
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   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/export.h>
  52#include <linux/spinlock.h>
  53#include <linux/sockios.h>
  54#include <linux/socket.h>
  55#include <linux/in.h>
  56#include <linux/mroute.h>
  57#include <linux/netdevice.h>
  58#include <linux/in_route.h>
  59#include <linux/route.h>
  60#include <linux/skbuff.h>
  61#include <net/net_namespace.h>
  62#include <net/dst.h>
  63#include <net/sock.h>
  64#include <linux/ip.h>
  65#include <linux/net.h>
  66#include <net/ip.h>
  67#include <net/icmp.h>
  68#include <net/udp.h>
  69#include <net/raw.h>
  70#include <net/snmp.h>
  71#include <net/tcp_states.h>
  72#include <net/inet_common.h>
  73#include <net/checksum.h>
  74#include <net/xfrm.h>
  75#include <linux/rtnetlink.h>
  76#include <linux/proc_fs.h>
  77#include <linux/seq_file.h>
  78#include <linux/netfilter.h>
  79#include <linux/netfilter_ipv4.h>
  80#include <linux/compat.h>
  81
  82static struct raw_hashinfo raw_v4_hashinfo = {
  83        .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
  84};
  85
  86void raw_hash_sk(struct sock *sk)
  87{
  88        struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
  89        struct hlist_head *head;
  90
  91        head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
  92
  93        write_lock_bh(&h->lock);
  94        sk_add_node(sk, head);
  95        sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  96        write_unlock_bh(&h->lock);
  97}
  98EXPORT_SYMBOL_GPL(raw_hash_sk);
  99
 100void raw_unhash_sk(struct sock *sk)
 101{
 102        struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
 103
 104        write_lock_bh(&h->lock);
 105        if (sk_del_node_init(sk))
 106                sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 107        write_unlock_bh(&h->lock);
 108}
 109EXPORT_SYMBOL_GPL(raw_unhash_sk);
 110
 111static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
 112                unsigned short num, __be32 raddr, __be32 laddr, int dif)
 113{
 114        struct hlist_node *node;
 115
 116        sk_for_each_from(sk, node) {
 117                struct inet_sock *inet = inet_sk(sk);
 118
 119                if (net_eq(sock_net(sk), net) && inet->inet_num == num  &&
 120                    !(inet->inet_daddr && inet->inet_daddr != raddr)    &&
 121                    !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
 122                    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
 123                        goto found; /* gotcha */
 124        }
 125        sk = NULL;
 126found:
 127        return sk;
 128}
 129
 130/*
 131 *      0 - deliver
 132 *      1 - block
 133 */
 134static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
 135{
 136        struct icmphdr _hdr;
 137        const struct icmphdr *hdr;
 138
 139        hdr = skb_header_pointer(skb, skb_transport_offset(skb),
 140                                 sizeof(_hdr), &_hdr);
 141        if (!hdr)
 142                return 1;
 143
 144        if (hdr->type < 32) {
 145                __u32 data = raw_sk(sk)->filter.data;
 146
 147                return ((1U << hdr->type) & data) != 0;
 148        }
 149
 150        /* Do not block unknown ICMP types */
 151        return 0;
 152}
 153
 154/* IP input processing comes here for RAW socket delivery.
 155 * Caller owns SKB, so we must make clones.
 156 *
 157 * RFC 1122: SHOULD pass TOS value up to the transport layer.
 158 * -> It does. And not only TOS, but all IP header.
 159 */
 160static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 161{
 162        struct sock *sk;
 163        struct hlist_head *head;
 164        int delivered = 0;
 165        struct net *net;
 166
 167        read_lock(&raw_v4_hashinfo.lock);
 168        head = &raw_v4_hashinfo.ht[hash];
 169        if (hlist_empty(head))
 170                goto out;
 171
 172        net = dev_net(skb->dev);
 173        sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
 174                             iph->saddr, iph->daddr,
 175                             skb->dev->ifindex);
 176
 177        while (sk) {
 178                delivered = 1;
 179                if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
 180                        struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 181
 182                        /* Not releasing hash table! */
 183                        if (clone)
 184                                raw_rcv(sk, clone);
 185                }
 186                sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
 187                                     iph->saddr, iph->daddr,
 188                                     skb->dev->ifindex);
 189        }
 190out:
 191        read_unlock(&raw_v4_hashinfo.lock);
 192        return delivered;
 193}
 194
 195int raw_local_deliver(struct sk_buff *skb, int protocol)
 196{
 197        int hash;
 198        struct sock *raw_sk;
 199
 200        hash = protocol & (RAW_HTABLE_SIZE - 1);
 201        raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 202
 203        /* If there maybe a raw socket we must check - if not we
 204         * don't care less
 205         */
 206        if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
 207                raw_sk = NULL;
 208
 209        return raw_sk != NULL;
 210
 211}
 212
 213static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
 214{
 215        struct inet_sock *inet = inet_sk(sk);
 216        const int type = icmp_hdr(skb)->type;
 217        const int code = icmp_hdr(skb)->code;
 218        int err = 0;
 219        int harderr = 0;
 220
 221        if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
 222                ipv4_sk_update_pmtu(skb, sk, info);
 223        else if (type == ICMP_REDIRECT)
 224                ipv4_sk_redirect(skb, sk);
 225
 226        /* Report error on raw socket, if:
 227           1. User requested ip_recverr.
 228           2. Socket is connected (otherwise the error indication
 229              is useless without ip_recverr and error is hard.
 230         */
 231        if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
 232                return;
 233
 234        switch (type) {
 235        default:
 236        case ICMP_TIME_EXCEEDED:
 237                err = EHOSTUNREACH;
 238                break;
 239        case ICMP_SOURCE_QUENCH:
 240                return;
 241        case ICMP_PARAMETERPROB:
 242                err = EPROTO;
 243                harderr = 1;
 244                break;
 245        case ICMP_DEST_UNREACH:
 246                err = EHOSTUNREACH;
 247                if (code > NR_ICMP_UNREACH)
 248                        break;
 249                err = icmp_err_convert[code].errno;
 250                harderr = icmp_err_convert[code].fatal;
 251                if (code == ICMP_FRAG_NEEDED) {
 252                        harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
 253                        err = EMSGSIZE;
 254                }
 255        }
 256
 257        if (inet->recverr) {
 258                const struct iphdr *iph = (const struct iphdr *)skb->data;
 259                u8 *payload = skb->data + (iph->ihl << 2);
 260
 261                if (inet->hdrincl)
 262                        payload = skb->data;
 263                ip_icmp_error(sk, skb, err, 0, info, payload);
 264        }
 265
 266        if (inet->recverr || harderr) {
 267                sk->sk_err = err;
 268                sk->sk_error_report(sk);
 269        }
 270}
 271
 272void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
 273{
 274        int hash;
 275        struct sock *raw_sk;
 276        const struct iphdr *iph;
 277        struct net *net;
 278
 279        hash = protocol & (RAW_HTABLE_SIZE - 1);
 280
 281        read_lock(&raw_v4_hashinfo.lock);
 282        raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 283        if (raw_sk != NULL) {
 284                iph = (const struct iphdr *)skb->data;
 285                net = dev_net(skb->dev);
 286
 287                while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
 288                                                iph->daddr, iph->saddr,
 289                                                skb->dev->ifindex)) != NULL) {
 290                        raw_err(raw_sk, skb, info);
 291                        raw_sk = sk_next(raw_sk);
 292                        iph = (const struct iphdr *)skb->data;
 293                }
 294        }
 295        read_unlock(&raw_v4_hashinfo.lock);
 296}
 297
 298static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 299{
 300        /* Charge it to the socket. */
 301
 302        ipv4_pktinfo_prepare(skb);
 303        if (sock_queue_rcv_skb(sk, skb) < 0) {
 304                kfree_skb(skb);
 305                return NET_RX_DROP;
 306        }
 307
 308        return NET_RX_SUCCESS;
 309}
 310
 311int raw_rcv(struct sock *sk, struct sk_buff *skb)
 312{
 313        if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
 314                atomic_inc(&sk->sk_drops);
 315                kfree_skb(skb);
 316                return NET_RX_DROP;
 317        }
 318        nf_reset(skb);
 319
 320        skb_push(skb, skb->data - skb_network_header(skb));
 321
 322        raw_rcv_skb(sk, skb);
 323        return 0;
 324}
 325
 326static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
 327                           void *from, size_t length,
 328                           struct rtable **rtp,
 329                           unsigned int flags)
 330{
 331        struct inet_sock *inet = inet_sk(sk);
 332        struct net *net = sock_net(sk);
 333        struct iphdr *iph;
 334        struct sk_buff *skb;
 335        unsigned int iphlen;
 336        int err;
 337        struct rtable *rt = *rtp;
 338        int hlen, tlen;
 339
 340        if (length > rt->dst.dev->mtu) {
 341                ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
 342                               rt->dst.dev->mtu);
 343                return -EMSGSIZE;
 344        }
 345        if (flags&MSG_PROBE)
 346                goto out;
 347
 348        hlen = LL_RESERVED_SPACE(rt->dst.dev);
 349        tlen = rt->dst.dev->needed_tailroom;
 350        skb = sock_alloc_send_skb(sk,
 351                                  length + hlen + tlen + 15,
 352                                  flags & MSG_DONTWAIT, &err);
 353        if (skb == NULL)
 354                goto error;
 355        skb_reserve(skb, hlen);
 356
 357        skb->priority = sk->sk_priority;
 358        skb->mark = sk->sk_mark;
 359        skb_dst_set(skb, &rt->dst);
 360        *rtp = NULL;
 361
 362        skb_reset_network_header(skb);
 363        iph = ip_hdr(skb);
 364        skb_put(skb, length);
 365
 366        skb->ip_summed = CHECKSUM_NONE;
 367
 368        skb->transport_header = skb->network_header;
 369        err = -EFAULT;
 370        if (memcpy_fromiovecend((void *)iph, from, 0, length))
 371                goto error_free;
 372
 373        iphlen = iph->ihl * 4;
 374
 375        /*
 376         * We don't want to modify the ip header, but we do need to
 377         * be sure that it won't cause problems later along the network
 378         * stack.  Specifically we want to make sure that iph->ihl is a
 379         * sane value.  If ihl points beyond the length of the buffer passed
 380         * in, reject the frame as invalid
 381         */
 382        err = -EINVAL;
 383        if (iphlen > length)
 384                goto error_free;
 385
 386        if (iphlen >= sizeof(*iph)) {
 387                if (!iph->saddr)
 388                        iph->saddr = fl4->saddr;
 389                iph->check   = 0;
 390                iph->tot_len = htons(length);
 391                if (!iph->id)
 392                        ip_select_ident(iph, &rt->dst, NULL);
 393
 394                iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 395        }
 396        if (iph->protocol == IPPROTO_ICMP)
 397                icmp_out_count(net, ((struct icmphdr *)
 398                        skb_transport_header(skb))->type);
 399
 400        err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
 401                      rt->dst.dev, dst_output);
 402        if (err > 0)
 403                err = net_xmit_errno(err);
 404        if (err)
 405                goto error;
 406out:
 407        return 0;
 408
 409error_free:
 410        kfree_skb(skb);
 411error:
 412        IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
 413        if (err == -ENOBUFS && !inet->recverr)
 414                err = 0;
 415        return err;
 416}
 417
 418static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg)
 419{
 420        struct iovec *iov;
 421        u8 __user *type = NULL;
 422        u8 __user *code = NULL;
 423        int probed = 0;
 424        unsigned int i;
 425
 426        if (!msg->msg_iov)
 427                return 0;
 428
 429        for (i = 0; i < msg->msg_iovlen; i++) {
 430                iov = &msg->msg_iov[i];
 431                if (!iov)
 432                        continue;
 433
 434                switch (fl4->flowi4_proto) {
 435                case IPPROTO_ICMP:
 436                        /* check if one-byte field is readable or not. */
 437                        if (iov->iov_base && iov->iov_len < 1)
 438                                break;
 439
 440                        if (!type) {
 441                                type = iov->iov_base;
 442                                /* check if code field is readable or not. */
 443                                if (iov->iov_len > 1)
 444                                        code = type + 1;
 445                        } else if (!code)
 446                                code = iov->iov_base;
 447
 448                        if (type && code) {
 449                                if (get_user(fl4->fl4_icmp_type, type) ||
 450                                    get_user(fl4->fl4_icmp_code, code))
 451                                        return -EFAULT;
 452                                probed = 1;
 453                        }
 454                        break;
 455                default:
 456                        probed = 1;
 457                        break;
 458                }
 459                if (probed)
 460                        break;
 461        }
 462        return 0;
 463}
 464
 465static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 466                       size_t len)
 467{
 468        struct inet_sock *inet = inet_sk(sk);
 469        struct ipcm_cookie ipc;
 470        struct rtable *rt = NULL;
 471        struct flowi4 fl4;
 472        int free = 0;
 473        __be32 daddr;
 474        __be32 saddr;
 475        u8  tos;
 476        int err;
 477        struct ip_options_data opt_copy;
 478
 479        err = -EMSGSIZE;
 480        if (len > 0xFFFF)
 481                goto out;
 482
 483        /*
 484         *      Check the flags.
 485         */
 486
 487        err = -EOPNOTSUPP;
 488        if (msg->msg_flags & MSG_OOB)   /* Mirror BSD error message */
 489                goto out;               /* compatibility */
 490
 491        /*
 492         *      Get and verify the address.
 493         */
 494
 495        if (msg->msg_namelen) {
 496                struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
 497                err = -EINVAL;
 498                if (msg->msg_namelen < sizeof(*usin))
 499                        goto out;
 500                if (usin->sin_family != AF_INET) {
 501                        pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
 502                                     __func__, current->comm);
 503                        err = -EAFNOSUPPORT;
 504                        if (usin->sin_family)
 505                                goto out;
 506                }
 507                daddr = usin->sin_addr.s_addr;
 508                /* ANK: I did not forget to get protocol from port field.
 509                 * I just do not know, who uses this weirdness.
 510                 * IP_HDRINCL is much more convenient.
 511                 */
 512        } else {
 513                err = -EDESTADDRREQ;
 514                if (sk->sk_state != TCP_ESTABLISHED)
 515                        goto out;
 516                daddr = inet->inet_daddr;
 517        }
 518
 519        ipc.addr = inet->inet_saddr;
 520        ipc.opt = NULL;
 521        ipc.tx_flags = 0;
 522        ipc.oif = sk->sk_bound_dev_if;
 523
 524        if (msg->msg_controllen) {
 525                err = ip_cmsg_send(sock_net(sk), msg, &ipc);
 526                if (err)
 527                        goto out;
 528                if (ipc.opt)
 529                        free = 1;
 530        }
 531
 532        saddr = ipc.addr;
 533        ipc.addr = daddr;
 534
 535        if (!ipc.opt) {
 536                struct ip_options_rcu *inet_opt;
 537
 538                rcu_read_lock();
 539                inet_opt = rcu_dereference(inet->inet_opt);
 540                if (inet_opt) {
 541                        memcpy(&opt_copy, inet_opt,
 542                               sizeof(*inet_opt) + inet_opt->opt.optlen);
 543                        ipc.opt = &opt_copy.opt;
 544                }
 545                rcu_read_unlock();
 546        }
 547
 548        if (ipc.opt) {
 549                err = -EINVAL;
 550                /* Linux does not mangle headers on raw sockets,
 551                 * so that IP options + IP_HDRINCL is non-sense.
 552                 */
 553                if (inet->hdrincl)
 554                        goto done;
 555                if (ipc.opt->opt.srr) {
 556                        if (!daddr)
 557                                goto done;
 558                        daddr = ipc.opt->opt.faddr;
 559                }
 560        }
 561        tos = RT_CONN_FLAGS(sk);
 562        if (msg->msg_flags & MSG_DONTROUTE)
 563                tos |= RTO_ONLINK;
 564
 565        if (ipv4_is_multicast(daddr)) {
 566                if (!ipc.oif)
 567                        ipc.oif = inet->mc_index;
 568                if (!saddr)
 569                        saddr = inet->mc_addr;
 570        } else if (!ipc.oif)
 571                ipc.oif = inet->uc_index;
 572
 573        flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
 574                           RT_SCOPE_UNIVERSE,
 575                           inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
 576                           inet_sk_flowi_flags(sk) | FLOWI_FLAG_CAN_SLEEP,
 577                           daddr, saddr, 0, 0);
 578
 579        if (!inet->hdrincl) {
 580                err = raw_probe_proto_opt(&fl4, msg);
 581                if (err)
 582                        goto done;
 583        }
 584
 585        security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
 586        rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
 587        if (IS_ERR(rt)) {
 588                err = PTR_ERR(rt);
 589                rt = NULL;
 590                goto done;
 591        }
 592
 593        err = -EACCES;
 594        if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
 595                goto done;
 596
 597        if (msg->msg_flags & MSG_CONFIRM)
 598                goto do_confirm;
 599back_from_confirm:
 600
 601        if (inet->hdrincl)
 602                err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
 603                                      &rt, msg->msg_flags);
 604
 605         else {
 606                if (!ipc.addr)
 607                        ipc.addr = fl4.daddr;
 608                lock_sock(sk);
 609                err = ip_append_data(sk, &fl4, ip_generic_getfrag,
 610                                     msg->msg_iov, len, 0,
 611                                     &ipc, &rt, msg->msg_flags);
 612                if (err)
 613                        ip_flush_pending_frames(sk);
 614                else if (!(msg->msg_flags & MSG_MORE)) {
 615                        err = ip_push_pending_frames(sk, &fl4);
 616                        if (err == -ENOBUFS && !inet->recverr)
 617                                err = 0;
 618                }
 619                release_sock(sk);
 620        }
 621done:
 622        if (free)
 623                kfree(ipc.opt);
 624        ip_rt_put(rt);
 625
 626out:
 627        if (err < 0)
 628                return err;
 629        return len;
 630
 631do_confirm:
 632        dst_confirm(&rt->dst);
 633        if (!(msg->msg_flags & MSG_PROBE) || len)
 634                goto back_from_confirm;
 635        err = 0;
 636        goto done;
 637}
 638
 639static void raw_close(struct sock *sk, long timeout)
 640{
 641        /*
 642         * Raw sockets may have direct kernel references. Kill them.
 643         */
 644        ip_ra_control(sk, 0, NULL);
 645
 646        sk_common_release(sk);
 647}
 648
 649static void raw_destroy(struct sock *sk)
 650{
 651        lock_sock(sk);
 652        ip_flush_pending_frames(sk);
 653        release_sock(sk);
 654}
 655
 656/* This gets rid of all the nasties in af_inet. -DaveM */
 657static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 658{
 659        struct inet_sock *inet = inet_sk(sk);
 660        struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
 661        int ret = -EINVAL;
 662        int chk_addr_ret;
 663
 664        if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
 665                goto out;
 666        chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
 667        ret = -EADDRNOTAVAIL;
 668        if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
 669            chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
 670                goto out;
 671        inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 672        if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 673                inet->inet_saddr = 0;  /* Use device */
 674        sk_dst_reset(sk);
 675        ret = 0;
 676out:    return ret;
 677}
 678
 679/*
 680 *      This should be easy, if there is something there
 681 *      we return it, otherwise we block.
 682 */
 683
 684static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 685                       size_t len, int noblock, int flags, int *addr_len)
 686{
 687        struct inet_sock *inet = inet_sk(sk);
 688        size_t copied = 0;
 689        int err = -EOPNOTSUPP;
 690        struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
 691        struct sk_buff *skb;
 692
 693        if (flags & MSG_OOB)
 694                goto out;
 695
 696        if (addr_len)
 697                *addr_len = sizeof(*sin);
 698
 699        if (flags & MSG_ERRQUEUE) {
 700                err = ip_recv_error(sk, msg, len);
 701                goto out;
 702        }
 703
 704        skb = skb_recv_datagram(sk, flags, noblock, &err);
 705        if (!skb)
 706                goto out;
 707
 708        copied = skb->len;
 709        if (len < copied) {
 710                msg->msg_flags |= MSG_TRUNC;
 711                copied = len;
 712        }
 713
 714        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 715        if (err)
 716                goto done;
 717
 718        sock_recv_ts_and_drops(msg, sk, skb);
 719
 720        /* Copy the address. */
 721        if (sin) {
 722                sin->sin_family = AF_INET;
 723                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 724                sin->sin_port = 0;
 725                memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 726        }
 727        if (inet->cmsg_flags)
 728                ip_cmsg_recv(msg, skb);
 729        if (flags & MSG_TRUNC)
 730                copied = skb->len;
 731done:
 732        skb_free_datagram(sk, skb);
 733out:
 734        if (err)
 735                return err;
 736        return copied;
 737}
 738
 739static int raw_init(struct sock *sk)
 740{
 741        struct raw_sock *rp = raw_sk(sk);
 742
 743        if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
 744                memset(&rp->filter, 0, sizeof(rp->filter));
 745        return 0;
 746}
 747
 748static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
 749{
 750        if (optlen > sizeof(struct icmp_filter))
 751                optlen = sizeof(struct icmp_filter);
 752        if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
 753                return -EFAULT;
 754        return 0;
 755}
 756
 757static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
 758{
 759        int len, ret = -EFAULT;
 760
 761        if (get_user(len, optlen))
 762                goto out;
 763        ret = -EINVAL;
 764        if (len < 0)
 765                goto out;
 766        if (len > sizeof(struct icmp_filter))
 767                len = sizeof(struct icmp_filter);
 768        ret = -EFAULT;
 769        if (put_user(len, optlen) ||
 770            copy_to_user(optval, &raw_sk(sk)->filter, len))
 771                goto out;
 772        ret = 0;
 773out:    return ret;
 774}
 775
 776static int do_raw_setsockopt(struct sock *sk, int level, int optname,
 777                          char __user *optval, unsigned int optlen)
 778{
 779        if (optname == ICMP_FILTER) {
 780                if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 781                        return -EOPNOTSUPP;
 782                else
 783                        return raw_seticmpfilter(sk, optval, optlen);
 784        }
 785        return -ENOPROTOOPT;
 786}
 787
 788static int raw_setsockopt(struct sock *sk, int level, int optname,
 789                          char __user *optval, unsigned int optlen)
 790{
 791        if (level != SOL_RAW)
 792                return ip_setsockopt(sk, level, optname, optval, optlen);
 793        return do_raw_setsockopt(sk, level, optname, optval, optlen);
 794}
 795
 796#ifdef CONFIG_COMPAT
 797static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
 798                                 char __user *optval, unsigned int optlen)
 799{
 800        if (level != SOL_RAW)
 801                return compat_ip_setsockopt(sk, level, optname, optval, optlen);
 802        return do_raw_setsockopt(sk, level, optname, optval, optlen);
 803}
 804#endif
 805
 806static int do_raw_getsockopt(struct sock *sk, int level, int optname,
 807                          char __user *optval, int __user *optlen)
 808{
 809        if (optname == ICMP_FILTER) {
 810                if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 811                        return -EOPNOTSUPP;
 812                else
 813                        return raw_geticmpfilter(sk, optval, optlen);
 814        }
 815        return -ENOPROTOOPT;
 816}
 817
 818static int raw_getsockopt(struct sock *sk, int level, int optname,
 819                          char __user *optval, int __user *optlen)
 820{
 821        if (level != SOL_RAW)
 822                return ip_getsockopt(sk, level, optname, optval, optlen);
 823        return do_raw_getsockopt(sk, level, optname, optval, optlen);
 824}
 825
 826#ifdef CONFIG_COMPAT
 827static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
 828                                 char __user *optval, int __user *optlen)
 829{
 830        if (level != SOL_RAW)
 831                return compat_ip_getsockopt(sk, level, optname, optval, optlen);
 832        return do_raw_getsockopt(sk, level, optname, optval, optlen);
 833}
 834#endif
 835
 836static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
 837{
 838        switch (cmd) {
 839        case SIOCOUTQ: {
 840                int amount = sk_wmem_alloc_get(sk);
 841
 842                return put_user(amount, (int __user *)arg);
 843        }
 844        case SIOCINQ: {
 845                struct sk_buff *skb;
 846                int amount = 0;
 847
 848                spin_lock_bh(&sk->sk_receive_queue.lock);
 849                skb = skb_peek(&sk->sk_receive_queue);
 850                if (skb != NULL)
 851                        amount = skb->len;
 852                spin_unlock_bh(&sk->sk_receive_queue.lock);
 853                return put_user(amount, (int __user *)arg);
 854        }
 855
 856        default:
 857#ifdef CONFIG_IP_MROUTE
 858                return ipmr_ioctl(sk, cmd, (void __user *)arg);
 859#else
 860                return -ENOIOCTLCMD;
 861#endif
 862        }
 863}
 864
 865#ifdef CONFIG_COMPAT
 866static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 867{
 868        switch (cmd) {
 869        case SIOCOUTQ:
 870        case SIOCINQ:
 871                return -ENOIOCTLCMD;
 872        default:
 873#ifdef CONFIG_IP_MROUTE
 874                return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
 875#else
 876                return -ENOIOCTLCMD;
 877#endif
 878        }
 879}
 880#endif
 881
 882struct proto raw_prot = {
 883        .name              = "RAW",
 884        .owner             = THIS_MODULE,
 885        .close             = raw_close,
 886        .destroy           = raw_destroy,
 887        .connect           = ip4_datagram_connect,
 888        .disconnect        = udp_disconnect,
 889        .ioctl             = raw_ioctl,
 890        .init              = raw_init,
 891        .setsockopt        = raw_setsockopt,
 892        .getsockopt        = raw_getsockopt,
 893        .sendmsg           = raw_sendmsg,
 894        .recvmsg           = raw_recvmsg,
 895        .bind              = raw_bind,
 896        .backlog_rcv       = raw_rcv_skb,
 897        .hash              = raw_hash_sk,
 898        .unhash            = raw_unhash_sk,
 899        .obj_size          = sizeof(struct raw_sock),
 900        .h.raw_hash        = &raw_v4_hashinfo,
 901#ifdef CONFIG_COMPAT
 902        .compat_setsockopt = compat_raw_setsockopt,
 903        .compat_getsockopt = compat_raw_getsockopt,
 904        .compat_ioctl      = compat_raw_ioctl,
 905#endif
 906};
 907
 908#ifdef CONFIG_PROC_FS
 909static struct sock *raw_get_first(struct seq_file *seq)
 910{
 911        struct sock *sk;
 912        struct raw_iter_state *state = raw_seq_private(seq);
 913
 914        for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
 915                        ++state->bucket) {
 916                struct hlist_node *node;
 917
 918                sk_for_each(sk, node, &state->h->ht[state->bucket])
 919                        if (sock_net(sk) == seq_file_net(seq))
 920                                goto found;
 921        }
 922        sk = NULL;
 923found:
 924        return sk;
 925}
 926
 927static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
 928{
 929        struct raw_iter_state *state = raw_seq_private(seq);
 930
 931        do {
 932                sk = sk_next(sk);
 933try_again:
 934                ;
 935        } while (sk && sock_net(sk) != seq_file_net(seq));
 936
 937        if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
 938                sk = sk_head(&state->h->ht[state->bucket]);
 939                goto try_again;
 940        }
 941        return sk;
 942}
 943
 944static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
 945{
 946        struct sock *sk = raw_get_first(seq);
 947
 948        if (sk)
 949                while (pos && (sk = raw_get_next(seq, sk)) != NULL)
 950                        --pos;
 951        return pos ? NULL : sk;
 952}
 953
 954void *raw_seq_start(struct seq_file *seq, loff_t *pos)
 955{
 956        struct raw_iter_state *state = raw_seq_private(seq);
 957
 958        read_lock(&state->h->lock);
 959        return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 960}
 961EXPORT_SYMBOL_GPL(raw_seq_start);
 962
 963void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 964{
 965        struct sock *sk;
 966
 967        if (v == SEQ_START_TOKEN)
 968                sk = raw_get_first(seq);
 969        else
 970                sk = raw_get_next(seq, v);
 971        ++*pos;
 972        return sk;
 973}
 974EXPORT_SYMBOL_GPL(raw_seq_next);
 975
 976void raw_seq_stop(struct seq_file *seq, void *v)
 977{
 978        struct raw_iter_state *state = raw_seq_private(seq);
 979
 980        read_unlock(&state->h->lock);
 981}
 982EXPORT_SYMBOL_GPL(raw_seq_stop);
 983
 984static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
 985{
 986        struct inet_sock *inet = inet_sk(sp);
 987        __be32 dest = inet->inet_daddr,
 988               src = inet->inet_rcv_saddr;
 989        __u16 destp = 0,
 990              srcp  = inet->inet_num;
 991
 992        seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
 993                " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
 994                i, src, srcp, dest, destp, sp->sk_state,
 995                sk_wmem_alloc_get(sp),
 996                sk_rmem_alloc_get(sp),
 997                0, 0L, 0,
 998                from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
 999                0, sock_i_ino(sp),
1000                atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1001}
1002
1003static int raw_seq_show(struct seq_file *seq, void *v)
1004{
1005        if (v == SEQ_START_TOKEN)
1006                seq_printf(seq, "  sl  local_address rem_address   st tx_queue "
1007                                "rx_queue tr tm->when retrnsmt   uid  timeout "
1008                                "inode ref pointer drops\n");
1009        else
1010                raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1011        return 0;
1012}
1013
1014static const struct seq_operations raw_seq_ops = {
1015        .start = raw_seq_start,
1016        .next  = raw_seq_next,
1017        .stop  = raw_seq_stop,
1018        .show  = raw_seq_show,
1019};
1020
1021int raw_seq_open(struct inode *ino, struct file *file,
1022                 struct raw_hashinfo *h, const struct seq_operations *ops)
1023{
1024        int err;
1025        struct raw_iter_state *i;
1026
1027        err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1028        if (err < 0)
1029                return err;
1030
1031        i = raw_seq_private((struct seq_file *)file->private_data);
1032        i->h = h;
1033        return 0;
1034}
1035EXPORT_SYMBOL_GPL(raw_seq_open);
1036
1037static int raw_v4_seq_open(struct inode *inode, struct file *file)
1038{
1039        return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1040}
1041
1042static const struct file_operations raw_seq_fops = {
1043        .owner   = THIS_MODULE,
1044        .open    = raw_v4_seq_open,
1045        .read    = seq_read,
1046        .llseek  = seq_lseek,
1047        .release = seq_release_net,
1048};
1049
1050static __net_init int raw_init_net(struct net *net)
1051{
1052        if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
1053                return -ENOMEM;
1054
1055        return 0;
1056}
1057
1058static __net_exit void raw_exit_net(struct net *net)
1059{
1060        proc_net_remove(net, "raw");
1061}
1062
1063static __net_initdata struct pernet_operations raw_net_ops = {
1064        .init = raw_init_net,
1065        .exit = raw_exit_net,
1066};
1067
1068int __init raw_proc_init(void)
1069{
1070        return register_pernet_subsys(&raw_net_ops);
1071}
1072
1073void __init raw_proc_exit(void)
1074{
1075        unregister_pernet_subsys(&raw_net_ops);
1076}
1077#endif /* CONFIG_PROC_FS */
1078
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