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