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ip_sockglue.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.
 *
 *          The IP to API glue.
 *
 * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
 *
 * Authors: see ip.c
 *
 * Fixes:
 *          Many        :     Split from ip.c , see ip.c for history.
 *          Martin Mares      :     TOS setting fixed.
 *          Alan Cox    :     Fixed a couple of oopses in Martin's
 *                            TOS tweaks.
 *          Mike McLagan      :     Routing by source
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/tcp_states.h>
#include <linux/udp.h>
#include <linux/igmp.h>
#include <linux/netfilter.h>
#include <linux/route.h>
#include <linux/mroute.h>
#include <net/route.h>
#include <net/xfrm.h>
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <net/transp_v6.h>
#endif

#include <linux/errqueue.h>
#include <asm/uaccess.h>

#define IP_CMSG_PKTINFO       1
#define IP_CMSG_TTL           2
#define IP_CMSG_TOS           4
#define IP_CMSG_RECVOPTS      8
#define IP_CMSG_RETOPTS       16
#define IP_CMSG_PASSSEC       32

/*
 *    SOL_IP control messages.
 */

static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
{
      struct in_pktinfo info;
      struct rtable *rt = (struct rtable *)skb->dst;

      info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
      if (rt) {
            info.ipi_ifindex = rt->rt_iif;
            info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
      } else {
            info.ipi_ifindex = 0;
            info.ipi_spec_dst.s_addr = 0;
      }

      put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
}

static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
{
      int ttl = ip_hdr(skb)->ttl;
      put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
}

static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
{
      put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
}

static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
{
      if (IPCB(skb)->opt.optlen == 0)
            return;

      put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
             ip_hdr(skb) + 1);
}


static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
{
      unsigned char optbuf[sizeof(struct ip_options) + 40];
      struct ip_options * opt = (struct ip_options*)optbuf;

      if (IPCB(skb)->opt.optlen == 0)
            return;

      if (ip_options_echo(opt, skb)) {
            msg->msg_flags |= MSG_CTRUNC;
            return;
      }
      ip_options_undo(opt);

      put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
}

static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
      char *secdata;
      u32 seclen, secid;
      int err;

      err = security_socket_getpeersec_dgram(NULL, skb, &secid);
      if (err)
            return;

      err = security_secid_to_secctx(secid, &secdata, &seclen);
      if (err)
            return;

      put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
      security_release_secctx(secdata, seclen);
}


void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
{
      struct inet_sock *inet = inet_sk(skb->sk);
      unsigned flags = inet->cmsg_flags;

      /* Ordered by supposed usage frequency */
      if (flags & 1)
            ip_cmsg_recv_pktinfo(msg, skb);
      if ((flags>>=1) == 0)
            return;

      if (flags & 1)
            ip_cmsg_recv_ttl(msg, skb);
      if ((flags>>=1) == 0)
            return;

      if (flags & 1)
            ip_cmsg_recv_tos(msg, skb);
      if ((flags>>=1) == 0)
            return;

      if (flags & 1)
            ip_cmsg_recv_opts(msg, skb);
      if ((flags>>=1) == 0)
            return;

      if (flags & 1)
            ip_cmsg_recv_retopts(msg, skb);
      if ((flags>>=1) == 0)
            return;

      if (flags & 1)
            ip_cmsg_recv_security(msg, skb);
}

int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
{
      int err;
      struct cmsghdr *cmsg;

      for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
            if (!CMSG_OK(msg, cmsg))
                  return -EINVAL;
            if (cmsg->cmsg_level != SOL_IP)
                  continue;
            switch (cmsg->cmsg_type) {
            case IP_RETOPTS:
                  err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
                  err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
                  if (err)
                        return err;
                  break;
            case IP_PKTINFO:
            {
                  struct in_pktinfo *info;
                  if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
                        return -EINVAL;
                  info = (struct in_pktinfo *)CMSG_DATA(cmsg);
                  ipc->oif = info->ipi_ifindex;
                  ipc->addr = info->ipi_spec_dst.s_addr;
                  break;
            }
            default:
                  return -EINVAL;
            }
      }
      return 0;
}


/* Special input handler for packets caught by router alert option.
   They are selected only by protocol field, and then processed likely
   local ones; but only if someone wants them! Otherwise, router
   not running rsvpd will kill RSVP.

   It is user level problem, what it will make with them.
   I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
   but receiver should be enough clever f.e. to forward mtrace requests,
   sent to multicast group to reach destination designated router.
 */
struct ip_ra_chain *ip_ra_chain;
DEFINE_RWLOCK(ip_ra_lock);

int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
{
      struct ip_ra_chain *ra, *new_ra, **rap;

      if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
            return -EINVAL;

      new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;

      write_lock_bh(&ip_ra_lock);
      for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
            if (ra->sk == sk) {
                  if (on) {
                        write_unlock_bh(&ip_ra_lock);
                        kfree(new_ra);
                        return -EADDRINUSE;
                  }
                  *rap = ra->next;
                  write_unlock_bh(&ip_ra_lock);

                  if (ra->destructor)
                        ra->destructor(sk);
                  sock_put(sk);
                  kfree(ra);
                  return 0;
            }
      }
      if (new_ra == NULL) {
            write_unlock_bh(&ip_ra_lock);
            return -ENOBUFS;
      }
      new_ra->sk = sk;
      new_ra->destructor = destructor;

      new_ra->next = ra;
      *rap = new_ra;
      sock_hold(sk);
      write_unlock_bh(&ip_ra_lock);

      return 0;
}

void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
               __be16 port, u32 info, u8 *payload)
{
      struct inet_sock *inet = inet_sk(sk);
      struct sock_exterr_skb *serr;

      if (!inet->recverr)
            return;

      skb = skb_clone(skb, GFP_ATOMIC);
      if (!skb)
            return;

      serr = SKB_EXT_ERR(skb);
      serr->ee.ee_errno = err;
      serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
      serr->ee.ee_type = icmp_hdr(skb)->type;
      serr->ee.ee_code = icmp_hdr(skb)->code;
      serr->ee.ee_pad = 0;
      serr->ee.ee_info = info;
      serr->ee.ee_data = 0;
      serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
                           skb_network_header(skb);
      serr->port = port;

      if (skb_pull(skb, payload - skb->data) != NULL) {
            skb_reset_transport_header(skb);
            if (sock_queue_err_skb(sk, skb) == 0)
                  return;
      }
      kfree_skb(skb);
}

void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
{
      struct inet_sock *inet = inet_sk(sk);
      struct sock_exterr_skb *serr;
      struct iphdr *iph;
      struct sk_buff *skb;

      if (!inet->recverr)
            return;

      skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
      if (!skb)
            return;

      skb_put(skb, sizeof(struct iphdr));
      skb_reset_network_header(skb);
      iph = ip_hdr(skb);
      iph->daddr = daddr;

      serr = SKB_EXT_ERR(skb);
      serr->ee.ee_errno = err;
      serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
      serr->ee.ee_type = 0;
      serr->ee.ee_code = 0;
      serr->ee.ee_pad = 0;
      serr->ee.ee_info = info;
      serr->ee.ee_data = 0;
      serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
      serr->port = port;

      __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
      skb_reset_transport_header(skb);

      if (sock_queue_err_skb(sk, skb))
            kfree_skb(skb);
}

/*
 *    Handle MSG_ERRQUEUE
 */
int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
{
      struct sock_exterr_skb *serr;
      struct sk_buff *skb, *skb2;
      struct sockaddr_in *sin;
      struct {
            struct sock_extended_err ee;
            struct sockaddr_in       offender;
      } errhdr;
      int err;
      int copied;

      err = -EAGAIN;
      skb = skb_dequeue(&sk->sk_error_queue);
      if (skb == NULL)
            goto out;

      copied = skb->len;
      if (copied > len) {
            msg->msg_flags |= MSG_TRUNC;
            copied = len;
      }
      err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
      if (err)
            goto out_free_skb;

      sock_recv_timestamp(msg, sk, skb);

      serr = SKB_EXT_ERR(skb);

      sin = (struct sockaddr_in *)msg->msg_name;
      if (sin) {
            sin->sin_family = AF_INET;
            sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
                                       serr->addr_offset);
            sin->sin_port = serr->port;
            memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
      }

      memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
      sin = &errhdr.offender;
      sin->sin_family = AF_UNSPEC;
      if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
            struct inet_sock *inet = inet_sk(sk);

            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);
      }

      put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);

      /* Now we could try to dump offended packet options */

      msg->msg_flags |= MSG_ERRQUEUE;
      err = copied;

      /* Reset and regenerate socket error */
      spin_lock_bh(&sk->sk_error_queue.lock);
      sk->sk_err = 0;
      if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
            sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
            spin_unlock_bh(&sk->sk_error_queue.lock);
            sk->sk_error_report(sk);
      } else
            spin_unlock_bh(&sk->sk_error_queue.lock);

out_free_skb:
      kfree_skb(skb);
out:
      return err;
}


/*
 *    Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
 *    an IP socket.
 */

static int do_ip_setsockopt(struct sock *sk, int level,
                      int optname, char __user *optval, int optlen)
{
      struct inet_sock *inet = inet_sk(sk);
      int val=0,err;

      if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
                       (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
                       (1<<IP_RETOPTS) | (1<<IP_TOS) |
                       (1<<IP_TTL) | (1<<IP_HDRINCL) |
                       (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
                       (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
                       (1<<IP_PASSSEC))) ||
          optname == IP_MULTICAST_TTL ||
          optname == IP_MULTICAST_LOOP) {
            if (optlen >= sizeof(int)) {
                  if (get_user(val, (int __user *) optval))
                        return -EFAULT;
            } else if (optlen >= sizeof(char)) {
                  unsigned char ucval;

                  if (get_user(ucval, (unsigned char __user *) optval))
                        return -EFAULT;
                  val = (int) ucval;
            }
      }

      /* If optlen==0, it is equivalent to val == 0 */

      if (ip_mroute_opt(optname))
            return ip_mroute_setsockopt(sk,optname,optval,optlen);

      err = 0;
      lock_sock(sk);

      switch (optname) {
      case IP_OPTIONS:
      {
            struct ip_options * opt = NULL;
            if (optlen > 40 || optlen < 0)
                  goto e_inval;
            err = ip_options_get_from_user(&opt, optval, optlen);
            if (err)
                  break;
            if (inet->is_icsk) {
                  struct inet_connection_sock *icsk = inet_csk(sk);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
                  if (sk->sk_family == PF_INET ||
                      (!((1 << sk->sk_state) &
                         (TCPF_LISTEN | TCPF_CLOSE)) &&
                       inet->daddr != LOOPBACK4_IPV6)) {
#endif
                        if (inet->opt)
                              icsk->icsk_ext_hdr_len -= inet->opt->optlen;
                        if (opt)
                              icsk->icsk_ext_hdr_len += opt->optlen;
                        icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
                  }
#endif
            }
            opt = xchg(&inet->opt, opt);
            kfree(opt);
            break;
      }
      case IP_PKTINFO:
            if (val)
                  inet->cmsg_flags |= IP_CMSG_PKTINFO;
            else
                  inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
            break;
      case IP_RECVTTL:
            if (val)
                  inet->cmsg_flags |=  IP_CMSG_TTL;
            else
                  inet->cmsg_flags &= ~IP_CMSG_TTL;
            break;
      case IP_RECVTOS:
            if (val)
                  inet->cmsg_flags |=  IP_CMSG_TOS;
            else
                  inet->cmsg_flags &= ~IP_CMSG_TOS;
            break;
      case IP_RECVOPTS:
            if (val)
                  inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
            else
                  inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
            break;
      case IP_RETOPTS:
            if (val)
                  inet->cmsg_flags |= IP_CMSG_RETOPTS;
            else
                  inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
            break;
      case IP_PASSSEC:
            if (val)
                  inet->cmsg_flags |= IP_CMSG_PASSSEC;
            else
                  inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
            break;
      case IP_TOS:      /* This sets both TOS and Precedence */
            if (sk->sk_type == SOCK_STREAM) {
                  val &= ~3;
                  val |= inet->tos & 3;
            }
            if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
                !capable(CAP_NET_ADMIN)) {
                  err = -EPERM;
                  break;
            }
            if (inet->tos != val) {
                  inet->tos = val;
                  sk->sk_priority = rt_tos2priority(val);
                  sk_dst_reset(sk);
            }
            break;
      case IP_TTL:
            if (optlen<1)
                  goto e_inval;
            if (val != -1 && (val < 1 || val>255))
                  goto e_inval;
            inet->uc_ttl = val;
            break;
      case IP_HDRINCL:
            if (sk->sk_type != SOCK_RAW) {
                  err = -ENOPROTOOPT;
                  break;
            }
            inet->hdrincl = val ? 1 : 0;
            break;
      case IP_MTU_DISCOVER:
            if (val<0 || val>3)
                  goto e_inval;
            inet->pmtudisc = val;
            break;
      case IP_RECVERR:
            inet->recverr = !!val;
            if (!val)
                  skb_queue_purge(&sk->sk_error_queue);
            break;
      case IP_MULTICAST_TTL:
            if (sk->sk_type == SOCK_STREAM)
                  goto e_inval;
            if (optlen<1)
                  goto e_inval;
            if (val==-1)
                  val = 1;
            if (val < 0 || val > 255)
                  goto e_inval;
            inet->mc_ttl = val;
            break;
      case IP_MULTICAST_LOOP:
            if (optlen<1)
                  goto e_inval;
            inet->mc_loop = !!val;
            break;
      case IP_MULTICAST_IF:
      {
            struct ip_mreqn mreq;
            struct net_device *dev = NULL;

            if (sk->sk_type == SOCK_STREAM)
                  goto e_inval;
            /*
             *    Check the arguments are allowable
             */

            err = -EFAULT;
            if (optlen >= sizeof(struct ip_mreqn)) {
                  if (copy_from_user(&mreq,optval,sizeof(mreq)))
                        break;
            } else {
                  memset(&mreq, 0, sizeof(mreq));
                  if (optlen >= sizeof(struct in_addr) &&
                      copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
                        break;
            }

            if (!mreq.imr_ifindex) {
                  if (mreq.imr_address.s_addr == INADDR_ANY) {
                        inet->mc_index = 0;
                        inet->mc_addr  = 0;
                        err = 0;
                        break;
                  }
                  dev = ip_dev_find(mreq.imr_address.s_addr);
                  if (dev) {
                        mreq.imr_ifindex = dev->ifindex;
                        dev_put(dev);
                  }
            } else
                  dev = __dev_get_by_index(&init_net, mreq.imr_ifindex);


            err = -EADDRNOTAVAIL;
            if (!dev)
                  break;

            err = -EINVAL;
            if (sk->sk_bound_dev_if &&
                mreq.imr_ifindex != sk->sk_bound_dev_if)
                  break;

            inet->mc_index = mreq.imr_ifindex;
            inet->mc_addr  = mreq.imr_address.s_addr;
            err = 0;
            break;
      }

      case IP_ADD_MEMBERSHIP:
      case IP_DROP_MEMBERSHIP:
      {
            struct ip_mreqn mreq;

            err = -EPROTO;
            if (inet_sk(sk)->is_icsk)
                  break;

            if (optlen < sizeof(struct ip_mreq))
                  goto e_inval;
            err = -EFAULT;
            if (optlen >= sizeof(struct ip_mreqn)) {
                  if (copy_from_user(&mreq,optval,sizeof(mreq)))
                        break;
            } else {
                  memset(&mreq, 0, sizeof(mreq));
                  if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
                        break;
            }

            if (optname == IP_ADD_MEMBERSHIP)
                  err = ip_mc_join_group(sk, &mreq);
            else
                  err = ip_mc_leave_group(sk, &mreq);
            break;
      }
      case IP_MSFILTER:
      {
            extern int sysctl_igmp_max_msf;
            struct ip_msfilter *msf;

            if (optlen < IP_MSFILTER_SIZE(0))
                  goto e_inval;
            if (optlen > sysctl_optmem_max) {
                  err = -ENOBUFS;
                  break;
            }
            msf = kmalloc(optlen, GFP_KERNEL);
            if (!msf) {
                  err = -ENOBUFS;
                  break;
            }
            err = -EFAULT;
            if (copy_from_user(msf, optval, optlen)) {
                  kfree(msf);
                  break;
            }
            /* numsrc >= (1G-4) overflow in 32 bits */
            if (msf->imsf_numsrc >= 0x3ffffffcU ||
                msf->imsf_numsrc > sysctl_igmp_max_msf) {
                  kfree(msf);
                  err = -ENOBUFS;
                  break;
            }
            if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
                  kfree(msf);
                  err = -EINVAL;
                  break;
            }
            err = ip_mc_msfilter(sk, msf, 0);
            kfree(msf);
            break;
      }
      case IP_BLOCK_SOURCE:
      case IP_UNBLOCK_SOURCE:
      case IP_ADD_SOURCE_MEMBERSHIP:
      case IP_DROP_SOURCE_MEMBERSHIP:
      {
            struct ip_mreq_source mreqs;
            int omode, add;

            if (optlen != sizeof(struct ip_mreq_source))
                  goto e_inval;
            if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
                  err = -EFAULT;
                  break;
            }
            if (optname == IP_BLOCK_SOURCE) {
                  omode = MCAST_EXCLUDE;
                  add = 1;
            } else if (optname == IP_UNBLOCK_SOURCE) {
                  omode = MCAST_EXCLUDE;
                  add = 0;
            } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
                  struct ip_mreqn mreq;

                  mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
                  mreq.imr_address.s_addr = mreqs.imr_interface;
                  mreq.imr_ifindex = 0;
                  err = ip_mc_join_group(sk, &mreq);
                  if (err && err != -EADDRINUSE)
                        break;
                  omode = MCAST_INCLUDE;
                  add = 1;
            } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
                  omode = MCAST_INCLUDE;
                  add = 0;
            }
            err = ip_mc_source(add, omode, sk, &mreqs, 0);
            break;
      }
      case MCAST_JOIN_GROUP:
      case MCAST_LEAVE_GROUP:
      {
            struct group_req greq;
            struct sockaddr_in *psin;
            struct ip_mreqn mreq;

            if (optlen < sizeof(struct group_req))
                  goto e_inval;
            err = -EFAULT;
            if (copy_from_user(&greq, optval, sizeof(greq)))
                  break;
            psin = (struct sockaddr_in *)&greq.gr_group;
            if (psin->sin_family != AF_INET)
                  goto e_inval;
            memset(&mreq, 0, sizeof(mreq));
            mreq.imr_multiaddr = psin->sin_addr;
            mreq.imr_ifindex = greq.gr_interface;

            if (optname == MCAST_JOIN_GROUP)
                  err = ip_mc_join_group(sk, &mreq);
            else
                  err = ip_mc_leave_group(sk, &mreq);
            break;
      }
      case MCAST_JOIN_SOURCE_GROUP:
      case MCAST_LEAVE_SOURCE_GROUP:
      case MCAST_BLOCK_SOURCE:
      case MCAST_UNBLOCK_SOURCE:
      {
            struct group_source_req greqs;
            struct ip_mreq_source mreqs;
            struct sockaddr_in *psin;
            int omode, add;

            if (optlen != sizeof(struct group_source_req))
                  goto e_inval;
            if (copy_from_user(&greqs, optval, sizeof(greqs))) {
                  err = -EFAULT;
                  break;
            }
            if (greqs.gsr_group.ss_family != AF_INET ||
                greqs.gsr_source.ss_family != AF_INET) {
                  err = -EADDRNOTAVAIL;
                  break;
            }
            psin = (struct sockaddr_in *)&greqs.gsr_group;
            mreqs.imr_multiaddr = psin->sin_addr.s_addr;
            psin = (struct sockaddr_in *)&greqs.gsr_source;
            mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
            mreqs.imr_interface = 0; /* use index for mc_source */

            if (optname == MCAST_BLOCK_SOURCE) {
                  omode = MCAST_EXCLUDE;
                  add = 1;
            } else if (optname == MCAST_UNBLOCK_SOURCE) {
                  omode = MCAST_EXCLUDE;
                  add = 0;
            } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
                  struct ip_mreqn mreq;

                  psin = (struct sockaddr_in *)&greqs.gsr_group;
                  mreq.imr_multiaddr = psin->sin_addr;
                  mreq.imr_address.s_addr = 0;
                  mreq.imr_ifindex = greqs.gsr_interface;
                  err = ip_mc_join_group(sk, &mreq);
                  if (err && err != -EADDRINUSE)
                        break;
                  greqs.gsr_interface = mreq.imr_ifindex;
                  omode = MCAST_INCLUDE;
                  add = 1;
            } else /* MCAST_LEAVE_SOURCE_GROUP */ {
                  omode = MCAST_INCLUDE;
                  add = 0;
            }
            err = ip_mc_source(add, omode, sk, &mreqs,
                           greqs.gsr_interface);
            break;
      }
      case MCAST_MSFILTER:
      {
            extern int sysctl_igmp_max_msf;
            struct sockaddr_in *psin;
            struct ip_msfilter *msf = NULL;
            struct group_filter *gsf = NULL;
            int msize, i, ifindex;

            if (optlen < GROUP_FILTER_SIZE(0))
                  goto e_inval;
            if (optlen > sysctl_optmem_max) {
                  err = -ENOBUFS;
                  break;
            }
            gsf = kmalloc(optlen,GFP_KERNEL);
            if (!gsf) {
                  err = -ENOBUFS;
                  break;
            }
            err = -EFAULT;
            if (copy_from_user(gsf, optval, optlen)) {
                  goto mc_msf_out;
            }
            /* numsrc >= (4G-140)/128 overflow in 32 bits */
            if (gsf->gf_numsrc >= 0x1ffffff ||
                gsf->gf_numsrc > sysctl_igmp_max_msf) {
                  err = -ENOBUFS;
                  goto mc_msf_out;
            }
            if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
                  err = -EINVAL;
                  goto mc_msf_out;
            }
            msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
            msf = kmalloc(msize,GFP_KERNEL);
            if (!msf) {
                  err = -ENOBUFS;
                  goto mc_msf_out;
            }
            ifindex = gsf->gf_interface;
            psin = (struct sockaddr_in *)&gsf->gf_group;
            if (psin->sin_family != AF_INET) {
                  err = -EADDRNOTAVAIL;
                  goto mc_msf_out;
            }
            msf->imsf_multiaddr = psin->sin_addr.s_addr;
            msf->imsf_interface = 0;
            msf->imsf_fmode = gsf->gf_fmode;
            msf->imsf_numsrc = gsf->gf_numsrc;
            err = -EADDRNOTAVAIL;
            for (i=0; i<gsf->gf_numsrc; ++i) {
                  psin = (struct sockaddr_in *)&gsf->gf_slist[i];

                  if (psin->sin_family != AF_INET)
                        goto mc_msf_out;
                  msf->imsf_slist[i] = psin->sin_addr.s_addr;
            }
            kfree(gsf);
            gsf = NULL;

            err = ip_mc_msfilter(sk, msf, ifindex);
      mc_msf_out:
            kfree(msf);
            kfree(gsf);
            break;
      }
      case IP_ROUTER_ALERT:
            err = ip_ra_control(sk, val ? 1 : 0, NULL);
            break;

      case IP_FREEBIND:
            if (optlen<1)
                  goto e_inval;
            inet->freebind = !!val;
            break;

      case IP_IPSEC_POLICY:
      case IP_XFRM_POLICY:
            err = -EPERM;
            if (!capable(CAP_NET_ADMIN))
                  break;
            err = xfrm_user_policy(sk, optname, optval, optlen);
            break;

      default:
            err = -ENOPROTOOPT;
            break;
      }
      release_sock(sk);
      return err;

e_inval:
      release_sock(sk);
      return -EINVAL;
}

int ip_setsockopt(struct sock *sk, int level,
            int optname, char __user *optval, int optlen)
{
      int err;

      if (level != SOL_IP)
            return -ENOPROTOOPT;

      err = do_ip_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
                  optname != IP_IPSEC_POLICY &&
                  optname != IP_XFRM_POLICY &&
                  !ip_mroute_opt(optname)) {
            lock_sock(sk);
            err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
            release_sock(sk);
      }
#endif
      return err;
}

#ifdef CONFIG_COMPAT
int compat_ip_setsockopt(struct sock *sk, int level, int optname,
                   char __user *optval, int optlen)
{
      int err;

      if (level != SOL_IP)
            return -ENOPROTOOPT;

      err = do_ip_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
                  optname != IP_IPSEC_POLICY &&
                  optname != IP_XFRM_POLICY &&
                  !ip_mroute_opt(optname)) {
            lock_sock(sk);
            err = compat_nf_setsockopt(sk, PF_INET, optname,
                                 optval, optlen);
            release_sock(sk);
      }
#endif
      return err;
}

EXPORT_SYMBOL(compat_ip_setsockopt);
#endif

/*
 *    Get the options. Note for future reference. The GET of IP options gets the
 *    _received_ ones. The set sets the _sent_ ones.
 */

static int do_ip_getsockopt(struct sock *sk, int level, int optname,
                      char __user *optval, int __user *optlen)
{
      struct inet_sock *inet = inet_sk(sk);
      int val;
      int len;

      if (level != SOL_IP)
            return -EOPNOTSUPP;

      if (ip_mroute_opt(optname))
            return ip_mroute_getsockopt(sk,optname,optval,optlen);

      if (get_user(len,optlen))
            return -EFAULT;
      if (len < 0)
            return -EINVAL;

      lock_sock(sk);

      switch (optname) {
      case IP_OPTIONS:
      {
            unsigned char optbuf[sizeof(struct ip_options)+40];
            struct ip_options * opt = (struct ip_options*)optbuf;
            opt->optlen = 0;
            if (inet->opt)
                  memcpy(optbuf, inet->opt,
                         sizeof(struct ip_options)+
                         inet->opt->optlen);
            release_sock(sk);

            if (opt->optlen == 0)
                  return put_user(0, optlen);

            ip_options_undo(opt);

            len = min_t(unsigned int, len, opt->optlen);
            if (put_user(len, optlen))
                  return -EFAULT;
            if (copy_to_user(optval, opt->__data, len))
                  return -EFAULT;
            return 0;
      }
      case IP_PKTINFO:
            val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
            break;
      case IP_RECVTTL:
            val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
            break;
      case IP_RECVTOS:
            val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
            break;
      case IP_RECVOPTS:
            val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
            break;
      case IP_RETOPTS:
            val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
            break;
      case IP_PASSSEC:
            val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
            break;
      case IP_TOS:
            val = inet->tos;
            break;
      case IP_TTL:
            val = (inet->uc_ttl == -1 ?
                   sysctl_ip_default_ttl :
                   inet->uc_ttl);
            break;
      case IP_HDRINCL:
            val = inet->hdrincl;
            break;
      case IP_MTU_DISCOVER:
            val = inet->pmtudisc;
            break;
      case IP_MTU:
      {
            struct dst_entry *dst;
            val = 0;
            dst = sk_dst_get(sk);
            if (dst) {
                  val = dst_mtu(dst);
                  dst_release(dst);
            }
            if (!val) {
                  release_sock(sk);
                  return -ENOTCONN;
            }
            break;
      }
      case IP_RECVERR:
            val = inet->recverr;
            break;
      case IP_MULTICAST_TTL:
            val = inet->mc_ttl;
            break;
      case IP_MULTICAST_LOOP:
            val = inet->mc_loop;
            break;
      case IP_MULTICAST_IF:
      {
            struct in_addr addr;
            len = min_t(unsigned int, len, sizeof(struct in_addr));
            addr.s_addr = inet->mc_addr;
            release_sock(sk);

            if (put_user(len, optlen))
                  return -EFAULT;
            if (copy_to_user(optval, &addr, len))
                  return -EFAULT;
            return 0;
      }
      case IP_MSFILTER:
      {
            struct ip_msfilter msf;
            int err;

            if (len < IP_MSFILTER_SIZE(0)) {
                  release_sock(sk);
                  return -EINVAL;
            }
            if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
                  release_sock(sk);
                  return -EFAULT;
            }
            err = ip_mc_msfget(sk, &msf,
                           (struct ip_msfilter __user *)optval, optlen);
            release_sock(sk);
            return err;
      }
      case MCAST_MSFILTER:
      {
            struct group_filter gsf;
            int err;

            if (len < GROUP_FILTER_SIZE(0)) {
                  release_sock(sk);
                  return -EINVAL;
            }
            if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
                  release_sock(sk);
                  return -EFAULT;
            }
            err = ip_mc_gsfget(sk, &gsf,
                           (struct group_filter __user *)optval, optlen);
            release_sock(sk);
            return err;
      }
      case IP_PKTOPTIONS:
      {
            struct msghdr msg;

            release_sock(sk);

            if (sk->sk_type != SOCK_STREAM)
                  return -ENOPROTOOPT;

            msg.msg_control = optval;
            msg.msg_controllen = len;
            msg.msg_flags = 0;

            if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
                  struct in_pktinfo info;

                  info.ipi_addr.s_addr = inet->rcv_saddr;
                  info.ipi_spec_dst.s_addr = inet->rcv_saddr;
                  info.ipi_ifindex = inet->mc_index;
                  put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
            }
            if (inet->cmsg_flags & IP_CMSG_TTL) {
                  int hlim = inet->mc_ttl;
                  put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
            }
            len -= msg.msg_controllen;
            return put_user(len, optlen);
      }
      case IP_FREEBIND:
            val = inet->freebind;
            break;
      default:
            release_sock(sk);
            return -ENOPROTOOPT;
      }
      release_sock(sk);

      if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
            unsigned char ucval = (unsigned char)val;
            len = 1;
            if (put_user(len, optlen))
                  return -EFAULT;
            if (copy_to_user(optval,&ucval,1))
                  return -EFAULT;
      } else {
            len = min_t(unsigned int, sizeof(int), len);
            if (put_user(len, optlen))
                  return -EFAULT;
            if (copy_to_user(optval,&val,len))
                  return -EFAULT;
      }
      return 0;
}

int ip_getsockopt(struct sock *sk, int level,
              int optname, char __user *optval, int __user *optlen)
{
      int err;

      err = do_ip_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
                  !ip_mroute_opt(optname)) {
            int len;

            if (get_user(len,optlen))
                  return -EFAULT;

            lock_sock(sk);
            err = nf_getsockopt(sk, PF_INET, optname, optval,
                        &len);
            release_sock(sk);
            if (err >= 0)
                  err = put_user(len, optlen);
            return err;
      }
#endif
      return err;
}

#ifdef CONFIG_COMPAT
int compat_ip_getsockopt(struct sock *sk, int level, int optname,
                   char __user *optval, int __user *optlen)
{
      int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
                  !ip_mroute_opt(optname)) {
            int len;

            if (get_user(len, optlen))
                  return -EFAULT;

            lock_sock(sk);
            err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
            release_sock(sk);
            if (err >= 0)
                  err = put_user(len, optlen);
            return err;
      }
#endif
      return err;
}

EXPORT_SYMBOL(compat_ip_getsockopt);
#endif

EXPORT_SYMBOL(ip_cmsg_recv);

EXPORT_SYMBOL(ip_getsockopt);
EXPORT_SYMBOL(ip_setsockopt);

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