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raw.c

/*
 * INET           An implementation of the TCP/IP protocol suite for the LINUX
 *          operating system.  INET is implemented using the  BSD Socket
 *          interface as the means of communication with the user level.
 *
 *          RAW - implementation of IP "raw" sockets.
 *
 * Version: $Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $
 *
 * Authors: Ross Biro
 *          Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 * Fixes:
 *          Alan Cox    :     verify_area() fixed up
 *          Alan Cox    :     ICMP error handling
 *          Alan Cox    :     EMSGSIZE if you send too big a packet
 *          Alan Cox    :     Now uses generic datagrams and shared
 *                            skbuff library. No more peek crashes,
 *                            no more backlogs
 *          Alan Cox    :     Checks sk->broadcast.
 *          Alan Cox    :     Uses skb_free_datagram/skb_copy_datagram
 *          Alan Cox    :     Raw passes ip options too
 *          Alan Cox    :     Setsocketopt added
 *          Alan Cox    :     Fixed error return for broadcasts
 *          Alan Cox    :     Removed wake_up calls
 *          Alan Cox    :     Use ttl/tos
 *          Alan Cox    :     Cleaned up old debugging
 *          Alan Cox    :     Use new kernel side addresses
 *    Arnt Gulbrandsen  :     Fixed MSG_DONTROUTE in raw sockets.
 *          Alan Cox    :     BSD style RAW socket demultiplexing.
 *          Alan Cox    :     Beginnings of mrouted support.
 *          Alan Cox    :     Added IP_HDRINCL option.
 *          Alan Cox    :     Skip broadcast check if BSDism set.
 *          David S. Miller   :     New socket lookup architecture.
 *
 *          This program is free software; you can redistribute it and/or
 *          modify it under the terms of the GNU General Public License
 *          as published by the Free Software Foundation; either version
 *          2 of the License, or (at your option) any later version.
 */

#include <linux/types.h>
#include <asm/atomic.h>
#include <asm/byteorder.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/aio.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/sockios.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/mroute.h>
#include <linux/netdevice.h>
#include <linux/in_route.h>
#include <linux/route.h>
#include <linux/skbuff.h>
#include <net/net_namespace.h>
#include <net/dst.h>
#include <net/sock.h>
#include <linux/gfp.h>
#include <linux/ip.h>
#include <linux/net.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/raw.h>
#include <net/snmp.h>
#include <net/tcp_states.h>
#include <net/inet_common.h>
#include <net/checksum.h>
#include <net/xfrm.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>

struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE];
DEFINE_RWLOCK(raw_v4_lock);

static void raw_v4_hash(struct sock *sk)
{
      struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num &
                                     (RAWV4_HTABLE_SIZE - 1)];

      write_lock_bh(&raw_v4_lock);
      sk_add_node(sk, head);
      sock_prot_inc_use(sk->sk_prot);
      write_unlock_bh(&raw_v4_lock);
}

static void raw_v4_unhash(struct sock *sk)
{
      write_lock_bh(&raw_v4_lock);
      if (sk_del_node_init(sk))
            sock_prot_dec_use(sk->sk_prot);
      write_unlock_bh(&raw_v4_lock);
}

struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
                       __be32 raddr, __be32 laddr,
                       int dif)
{
      struct hlist_node *node;

      sk_for_each_from(sk, node) {
            struct inet_sock *inet = inet_sk(sk);

            if (inet->num == num                            &&
                !(inet->daddr && inet->daddr != raddr)            &&
                !(inet->rcv_saddr && inet->rcv_saddr != laddr)    &&
                !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
                  goto found; /* gotcha */
      }
      sk = NULL;
found:
      return sk;
}

/*
 *    0 - deliver
 *    1 - block
 */
static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
{
      int type;

      if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
            return 1;

      type = icmp_hdr(skb)->type;
      if (type < 32) {
            __u32 data = raw_sk(sk)->filter.data;

            return ((1 << type) & data) != 0;
      }

      /* Do not block unknown ICMP types */
      return 0;
}

/* IP input processing comes here for RAW socket delivery.
 * Caller owns SKB, so we must make clones.
 *
 * RFC 1122: SHOULD pass TOS value up to the transport layer.
 * -> It does. And not only TOS, but all IP header.
 */
int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
{
      struct sock *sk;
      struct hlist_head *head;
      int delivered = 0;

      read_lock(&raw_v4_lock);
      head = &raw_v4_htable[hash];
      if (hlist_empty(head))
            goto out;
      sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
                       iph->saddr, iph->daddr,
                       skb->dev->ifindex);

      while (sk) {
            delivered = 1;
            if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
                  struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);

                  /* Not releasing hash table! */
                  if (clone)
                        raw_rcv(sk, clone);
            }
            sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
                             iph->saddr, iph->daddr,
                             skb->dev->ifindex);
      }
out:
      read_unlock(&raw_v4_lock);
      return delivered;
}

void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
{
      struct inet_sock *inet = inet_sk(sk);
      const int type = icmp_hdr(skb)->type;
      const int code = icmp_hdr(skb)->code;
      int err = 0;
      int harderr = 0;

      /* Report error on raw socket, if:
         1. User requested ip_recverr.
         2. Socket is connected (otherwise the error indication
            is useless without ip_recverr and error is hard.
       */
      if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
            return;

      switch (type) {
      default:
      case ICMP_TIME_EXCEEDED:
            err = EHOSTUNREACH;
            break;
      case ICMP_SOURCE_QUENCH:
            return;
      case ICMP_PARAMETERPROB:
            err = EPROTO;
            harderr = 1;
            break;
      case ICMP_DEST_UNREACH:
            err = EHOSTUNREACH;
            if (code > NR_ICMP_UNREACH)
                  break;
            err = icmp_err_convert[code].errno;
            harderr = icmp_err_convert[code].fatal;
            if (code == ICMP_FRAG_NEEDED) {
                  harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
                  err = EMSGSIZE;
            }
      }

      if (inet->recverr) {
            struct iphdr *iph = (struct iphdr*)skb->data;
            u8 *payload = skb->data + (iph->ihl << 2);

            if (inet->hdrincl)
                  payload = skb->data;
            ip_icmp_error(sk, skb, err, 0, info, payload);
      }

      if (inet->recverr || harderr) {
            sk->sk_err = err;
            sk->sk_error_report(sk);
      }
}

static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
{
      /* Charge it to the socket. */

      if (sock_queue_rcv_skb(sk, skb) < 0) {
            /* FIXME: increment a raw drops counter here */
            kfree_skb(skb);
            return NET_RX_DROP;
      }

      return NET_RX_SUCCESS;
}

int raw_rcv(struct sock *sk, struct sk_buff *skb)
{
      if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
            kfree_skb(skb);
            return NET_RX_DROP;
      }
      nf_reset(skb);

      skb_push(skb, skb->data - skb_network_header(skb));

      raw_rcv_skb(sk, skb);
      return 0;
}

static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
                  struct rtable *rt,
                  unsigned int flags)
{
      struct inet_sock *inet = inet_sk(sk);
      int hh_len;
      struct iphdr *iph;
      struct sk_buff *skb;
      unsigned int iphlen;
      int err;

      if (length > rt->u.dst.dev->mtu) {
            ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport,
                         rt->u.dst.dev->mtu);
            return -EMSGSIZE;
      }
      if (flags&MSG_PROBE)
            goto out;

      hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);

      skb = sock_alloc_send_skb(sk, length+hh_len+15,
                          flags&MSG_DONTWAIT, &err);
      if (skb == NULL)
            goto error;
      skb_reserve(skb, hh_len);

      skb->priority = sk->sk_priority;
      skb->dst = dst_clone(&rt->u.dst);

      skb_reset_network_header(skb);
      iph = ip_hdr(skb);
      skb_put(skb, length);

      skb->ip_summed = CHECKSUM_NONE;

      skb->transport_header = skb->network_header;
      err = memcpy_fromiovecend((void *)iph, from, 0, length);
      if (err)
            goto error_fault;

      /* We don't modify invalid header */
      iphlen = iph->ihl * 4;
      if (iphlen >= sizeof(*iph) && iphlen <= length) {
            if (!iph->saddr)
                  iph->saddr = rt->rt_src;
            iph->check   = 0;
            iph->tot_len = htons(length);
            if (!iph->id)
                  ip_select_ident(iph, &rt->u.dst, NULL);

            iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
      }
      if (iph->protocol == IPPROTO_ICMP)
            icmp_out_count(((struct icmphdr *)
                  skb_transport_header(skb))->type);

      err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
                  dst_output);
      if (err > 0)
            err = inet->recverr ? net_xmit_errno(err) : 0;
      if (err)
            goto error;
out:
      return 0;

error_fault:
      err = -EFAULT;
      kfree_skb(skb);
error:
      IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
      return err;
}

static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
{
      struct iovec *iov;
      u8 __user *type = NULL;
      u8 __user *code = NULL;
      int probed = 0;
      unsigned int i;

      if (!msg->msg_iov)
            return 0;

      for (i = 0; i < msg->msg_iovlen; i++) {
            iov = &msg->msg_iov[i];
            if (!iov)
                  continue;

            switch (fl->proto) {
            case IPPROTO_ICMP:
                  /* check if one-byte field is readable or not. */
                  if (iov->iov_base && iov->iov_len < 1)
                        break;

                  if (!type) {
                        type = iov->iov_base;
                        /* check if code field is readable or not. */
                        if (iov->iov_len > 1)
                              code = type + 1;
                  } else if (!code)
                        code = iov->iov_base;

                  if (type && code) {
                        if (get_user(fl->fl_icmp_type, type) ||
                            get_user(fl->fl_icmp_code, code))
                              return -EFAULT;
                        probed = 1;
                  }
                  break;
            default:
                  probed = 1;
                  break;
            }
            if (probed)
                  break;
      }
      return 0;
}

static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                   size_t len)
{
      struct inet_sock *inet = inet_sk(sk);
      struct ipcm_cookie ipc;
      struct rtable *rt = NULL;
      int free = 0;
      __be32 daddr;
      __be32 saddr;
      u8  tos;
      int err;

      err = -EMSGSIZE;
      if (len > 0xFFFF)
            goto out;

      /*
       *    Check the flags.
       */

      err = -EOPNOTSUPP;
      if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
            goto out;               /* compatibility */

      /*
       *    Get and verify the address.
       */

      if (msg->msg_namelen) {
            struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
            err = -EINVAL;
            if (msg->msg_namelen < sizeof(*usin))
                  goto out;
            if (usin->sin_family != AF_INET) {
                  static int complained;
                  if (!complained++)
                        printk(KERN_INFO "%s forgot to set AF_INET in "
                                     "raw sendmsg. Fix it!\n",
                                     current->comm);
                  err = -EAFNOSUPPORT;
                  if (usin->sin_family)
                        goto out;
            }
            daddr = usin->sin_addr.s_addr;
            /* ANK: I did not forget to get protocol from port field.
             * I just do not know, who uses this weirdness.
             * IP_HDRINCL is much more convenient.
             */
      } else {
            err = -EDESTADDRREQ;
            if (sk->sk_state != TCP_ESTABLISHED)
                  goto out;
            daddr = inet->daddr;
      }

      ipc.addr = inet->saddr;
      ipc.opt = NULL;
      ipc.oif = sk->sk_bound_dev_if;

      if (msg->msg_controllen) {
            err = ip_cmsg_send(msg, &ipc);
            if (err)
                  goto out;
            if (ipc.opt)
                  free = 1;
      }

      saddr = ipc.addr;
      ipc.addr = daddr;

      if (!ipc.opt)
            ipc.opt = inet->opt;

      if (ipc.opt) {
            err = -EINVAL;
            /* Linux does not mangle headers on raw sockets,
             * so that IP options + IP_HDRINCL is non-sense.
             */
            if (inet->hdrincl)
                  goto done;
            if (ipc.opt->srr) {
                  if (!daddr)
                        goto done;
                  daddr = ipc.opt->faddr;
            }
      }
      tos = RT_CONN_FLAGS(sk);
      if (msg->msg_flags & MSG_DONTROUTE)
            tos |= RTO_ONLINK;

      if (MULTICAST(daddr)) {
            if (!ipc.oif)
                  ipc.oif = inet->mc_index;
            if (!saddr)
                  saddr = inet->mc_addr;
      }

      {
            struct flowi fl = { .oif = ipc.oif,
                            .nl_u = { .ip4_u =
                                    { .daddr = daddr,
                                    .saddr = saddr,
                                    .tos = tos } },
                            .proto = inet->hdrincl ? IPPROTO_RAW :
                                               sk->sk_protocol,
                          };
            if (!inet->hdrincl) {
                  err = raw_probe_proto_opt(&fl, msg);
                  if (err)
                        goto done;
            }

            security_sk_classify_flow(sk, &fl);
            err = ip_route_output_flow(&rt, &fl, sk, 1);
      }
      if (err)
            goto done;

      err = -EACCES;
      if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
            goto done;

      if (msg->msg_flags & MSG_CONFIRM)
            goto do_confirm;
back_from_confirm:

      if (inet->hdrincl)
            err = raw_send_hdrinc(sk, msg->msg_iov, len,
                              rt, msg->msg_flags);

       else {
            if (!ipc.addr)
                  ipc.addr = rt->rt_dst;
            lock_sock(sk);
            err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
                              &ipc, rt, msg->msg_flags);
            if (err)
                  ip_flush_pending_frames(sk);
            else if (!(msg->msg_flags & MSG_MORE))
                  err = ip_push_pending_frames(sk);
            release_sock(sk);
      }
done:
      if (free)
            kfree(ipc.opt);
      ip_rt_put(rt);

out:
      if (err < 0)
            return err;
      return len;

do_confirm:
      dst_confirm(&rt->u.dst);
      if (!(msg->msg_flags & MSG_PROBE) || len)
            goto back_from_confirm;
      err = 0;
      goto done;
}

static void raw_close(struct sock *sk, long timeout)
{
      /*
       * Raw sockets may have direct kernel refereneces. Kill them.
       */
      ip_ra_control(sk, 0, NULL);

      sk_common_release(sk);
}

/* This gets rid of all the nasties in af_inet. -DaveM */
static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
      struct inet_sock *inet = inet_sk(sk);
      struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
      int ret = -EINVAL;
      int chk_addr_ret;

      if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
            goto out;
      chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
      ret = -EADDRNOTAVAIL;
      if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
          chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
            goto out;
      inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
      if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
            inet->saddr = 0;  /* Use device */
      sk_dst_reset(sk);
      ret = 0;
out:  return ret;
}

/*
 *    This should be easy, if there is something there
 *    we return it, otherwise we block.
 */

static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                   size_t len, int noblock, int flags, int *addr_len)
{
      struct inet_sock *inet = inet_sk(sk);
      size_t copied = 0;
      int err = -EOPNOTSUPP;
      struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
      struct sk_buff *skb;

      if (flags & MSG_OOB)
            goto out;

      if (addr_len)
            *addr_len = sizeof(*sin);

      if (flags & MSG_ERRQUEUE) {
            err = ip_recv_error(sk, msg, len);
            goto out;
      }

      skb = skb_recv_datagram(sk, flags, noblock, &err);
      if (!skb)
            goto out;

      copied = skb->len;
      if (len < copied) {
            msg->msg_flags |= MSG_TRUNC;
            copied = len;
      }

      err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
      if (err)
            goto done;

      sock_recv_timestamp(msg, sk, skb);

      /* Copy the address. */
      if (sin) {
            sin->sin_family = AF_INET;
            sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
            sin->sin_port = 0;
            memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
      }
      if (inet->cmsg_flags)
            ip_cmsg_recv(msg, skb);
      if (flags & MSG_TRUNC)
            copied = skb->len;
done:
      skb_free_datagram(sk, skb);
out:
      if (err)
            return err;
      return copied;
}

static int raw_init(struct sock *sk)
{
      struct raw_sock *rp = raw_sk(sk);

      if (inet_sk(sk)->num == IPPROTO_ICMP)
            memset(&rp->filter, 0, sizeof(rp->filter));
      return 0;
}

static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
{
      if (optlen > sizeof(struct icmp_filter))
            optlen = sizeof(struct icmp_filter);
      if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
            return -EFAULT;
      return 0;
}

static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
{
      int len, ret = -EFAULT;

      if (get_user(len, optlen))
            goto out;
      ret = -EINVAL;
      if (len < 0)
            goto out;
      if (len > sizeof(struct icmp_filter))
            len = sizeof(struct icmp_filter);
      ret = -EFAULT;
      if (put_user(len, optlen) ||
          copy_to_user(optval, &raw_sk(sk)->filter, len))
            goto out;
      ret = 0;
out:  return ret;
}

static int do_raw_setsockopt(struct sock *sk, int level, int optname,
                    char __user *optval, int optlen)
{
      if (optname == ICMP_FILTER) {
            if (inet_sk(sk)->num != IPPROTO_ICMP)
                  return -EOPNOTSUPP;
            else
                  return raw_seticmpfilter(sk, optval, optlen);
      }
      return -ENOPROTOOPT;
}

static int raw_setsockopt(struct sock *sk, int level, int optname,
                    char __user *optval, int optlen)
{
      if (level != SOL_RAW)
            return ip_setsockopt(sk, level, optname, optval, optlen);
      return do_raw_setsockopt(sk, level, optname, optval, optlen);
}

#ifdef CONFIG_COMPAT
static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
                         char __user *optval, int optlen)
{
      if (level != SOL_RAW)
            return compat_ip_setsockopt(sk, level, optname, optval, optlen);
      return do_raw_setsockopt(sk, level, optname, optval, optlen);
}
#endif

static int do_raw_getsockopt(struct sock *sk, int level, int optname,
                    char __user *optval, int __user *optlen)
{
      if (optname == ICMP_FILTER) {
            if (inet_sk(sk)->num != IPPROTO_ICMP)
                  return -EOPNOTSUPP;
            else
                  return raw_geticmpfilter(sk, optval, optlen);
      }
      return -ENOPROTOOPT;
}

static int raw_getsockopt(struct sock *sk, int level, int optname,
                    char __user *optval, int __user *optlen)
{
      if (level != SOL_RAW)
            return ip_getsockopt(sk, level, optname, optval, optlen);
      return do_raw_getsockopt(sk, level, optname, optval, optlen);
}

#ifdef CONFIG_COMPAT
static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
                         char __user *optval, int __user *optlen)
{
      if (level != SOL_RAW)
            return compat_ip_getsockopt(sk, level, optname, optval, optlen);
      return do_raw_getsockopt(sk, level, optname, optval, optlen);
}
#endif

static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
      switch (cmd) {
            case SIOCOUTQ: {
                  int amount = atomic_read(&sk->sk_wmem_alloc);
                  return put_user(amount, (int __user *)arg);
            }
            case SIOCINQ: {
                  struct sk_buff *skb;
                  int amount = 0;

                  spin_lock_bh(&sk->sk_receive_queue.lock);
                  skb = skb_peek(&sk->sk_receive_queue);
                  if (skb != NULL)
                        amount = skb->len;
                  spin_unlock_bh(&sk->sk_receive_queue.lock);
                  return put_user(amount, (int __user *)arg);
            }

            default:
#ifdef CONFIG_IP_MROUTE
                  return ipmr_ioctl(sk, cmd, (void __user *)arg);
#else
                  return -ENOIOCTLCMD;
#endif
      }
}

DEFINE_PROTO_INUSE(raw)

struct proto raw_prot = {
      .name          = "RAW",
      .owner               = THIS_MODULE,
      .close               = raw_close,
      .connect       = ip4_datagram_connect,
      .disconnect    = udp_disconnect,
      .ioctl               = raw_ioctl,
      .init          = raw_init,
      .setsockopt    = raw_setsockopt,
      .getsockopt    = raw_getsockopt,
      .sendmsg       = raw_sendmsg,
      .recvmsg       = raw_recvmsg,
      .bind          = raw_bind,
      .backlog_rcv         = raw_rcv_skb,
      .hash          = raw_v4_hash,
      .unhash              = raw_v4_unhash,
      .obj_size      = sizeof(struct raw_sock),
#ifdef CONFIG_COMPAT
      .compat_setsockopt = compat_raw_setsockopt,
      .compat_getsockopt = compat_raw_getsockopt,
#endif
      REF_PROTO_INUSE(raw)
};

#ifdef CONFIG_PROC_FS
struct raw_iter_state {
      int bucket;
};

#define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private)

static struct sock *raw_get_first(struct seq_file *seq)
{
      struct sock *sk;
      struct raw_iter_state* state = raw_seq_private(seq);

      for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) {
            struct hlist_node *node;

            sk_for_each(sk, node, &raw_v4_htable[state->bucket])
                  if (sk->sk_family == PF_INET)
                        goto found;
      }
      sk = NULL;
found:
      return sk;
}

static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
{
      struct raw_iter_state* state = raw_seq_private(seq);

      do {
            sk = sk_next(sk);
try_again:
            ;
      } while (sk && sk->sk_family != PF_INET);

      if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) {
            sk = sk_head(&raw_v4_htable[state->bucket]);
            goto try_again;
      }
      return sk;
}

static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
{
      struct sock *sk = raw_get_first(seq);

      if (sk)
            while (pos && (sk = raw_get_next(seq, sk)) != NULL)
                  --pos;
      return pos ? NULL : sk;
}

static void *raw_seq_start(struct seq_file *seq, loff_t *pos)
{
      read_lock(&raw_v4_lock);
      return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
      struct sock *sk;

      if (v == SEQ_START_TOKEN)
            sk = raw_get_first(seq);
      else
            sk = raw_get_next(seq, v);
      ++*pos;
      return sk;
}

static void raw_seq_stop(struct seq_file *seq, void *v)
{
      read_unlock(&raw_v4_lock);
}

static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i)
{
      struct inet_sock *inet = inet_sk(sp);
      __be32 dest = inet->daddr,
             src = inet->rcv_saddr;
      __u16 destp = 0,
            srcp  = inet->num;

      sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
            " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
            i, src, srcp, dest, destp, sp->sk_state,
            atomic_read(&sp->sk_wmem_alloc),
            atomic_read(&sp->sk_rmem_alloc),
            0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
            atomic_read(&sp->sk_refcnt), sp);
      return tmpbuf;
}

static int raw_seq_show(struct seq_file *seq, void *v)
{
      char tmpbuf[129];

      if (v == SEQ_START_TOKEN)
            seq_printf(seq, "%-127s\n",
                         "  sl  local_address rem_address   st tx_queue "
                         "rx_queue tr tm->when retrnsmt   uid  timeout "
                         "inode");
      else {
            struct raw_iter_state *state = raw_seq_private(seq);

            seq_printf(seq, "%-127s\n",
                     get_raw_sock(v, tmpbuf, state->bucket));
      }
      return 0;
}

static const struct seq_operations raw_seq_ops = {
      .start = raw_seq_start,
      .next  = raw_seq_next,
      .stop  = raw_seq_stop,
      .show  = raw_seq_show,
};

static int raw_seq_open(struct inode *inode, struct file *file)
{
      return seq_open_private(file, &raw_seq_ops,
                  sizeof(struct raw_iter_state));
}

static const struct file_operations raw_seq_fops = {
      .owner       = THIS_MODULE,
      .open  = raw_seq_open,
      .read  = seq_read,
      .llseek      = seq_lseek,
      .release = seq_release_private,
};

int __init raw_proc_init(void)
{
      if (!proc_net_fops_create(&init_net, "raw", S_IRUGO, &raw_seq_fops))
            return -ENOMEM;
      return 0;
}

void __init raw_proc_exit(void)
{
      proc_net_remove(&init_net, "raw");
}
#endif /* CONFIG_PROC_FS */

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