/*
   * 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 = skb->nh.iph->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 = skb->nh.iph->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, &skb->nh.iph->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, skb->nh.iph+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 = skb->h.icmph->type;

  	serr->ee.ee_code = skb->h.icmph->code;
  	serr->ee.ee_pad = 0;
  	serr->ee.ee_info = info;
  	serr->ee.ee_data = 0;
  	serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
  	serr->port = port;
  
  	skb->h.raw = payload;
  	if (!skb_pull(skb, payload - skb->data) ||
  	    sock_queue_err_skb(sk, skb))
  		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;
  
  	iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
  	skb->nh.iph = iph;
  	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->nh.raw;
  	serr->port = port;
  
  	skb->h.raw = skb->tail;
  	__skb_pull(skb, skb->tail - skb->data);
  
  	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->nh.raw + 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 = skb->nh.iph->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 */
  
  #ifdef CONFIG_IP_MROUTE
  	if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
  		return ip_mroute_setsockopt(sk,optname,optval,optlen);
  #endif
  
  	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>2)
  				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(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;
  
  			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 == 0) {
  				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 == 0) {
  				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 == 0) {
  				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
  #ifdef CONFIG_IP_MROUTE
  		&& (optname < MRT_BASE || optname > (MRT_BASE + 10))
  #endif
  	   ) {
  		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

  #ifdef CONFIG_IP_MROUTE

  	    && (optname < MRT_BASE || optname > (MRT_BASE + 10))

  #endif
  	   ) {
  		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;
  
  #ifdef CONFIG_IP_MROUTE
  	if(optname>=MRT_BASE && optname <=MRT_BASE+10)
  	{
  		return ip_mroute_getsockopt(sk,optname,optval,optlen);
  	}
  #endif
  
  	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
  #ifdef CONFIG_IP_MROUTE
  		&& (optname < MRT_BASE || optname > MRT_BASE+10)
  #endif
  	   ) {

  		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
  #ifdef CONFIG_IP_MROUTE

  	    && (optname < MRT_BASE || optname > MRT_BASE+10)

  #endif
  	   ) {

  		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);