[IPV4] UDP: Move IPv4-specific bits to other file.

Move IPv4-specific UDP bits from net/ipv4/udp.c into (new) net/ipv4/udp_ipv4.c.
Rename net/ipv4/udplite.c to net/ipv4/udplite_ipv4.c.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

4 files changed, 1136 insertions, 1088 deletions

diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index e88cebd..d522624 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -8,7 +8,7 @@ obj-y     := route.o inetpeer.o protocol.o \
 	     inet_timewait_sock.o inet_connection_sock.o \
 	     tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \
 	     tcp_minisocks.o tcp_cong.o \
-	     datagram.o raw.o udp.o \
+	     datagram.o raw.o udp.o udp_ipv4.o \
 	     arp.o icmp.o devinet.o af_inet.o  igmp.o \
 	     fib_frontend.o fib_semantics.o \
 	     inet_fragment.o
@@ -49,7 +49,7 @@ obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o
 obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
 obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
 obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
-obj-$(CONFIG_IP_UDPLITE) += udplite.o
+obj-$(CONFIG_IP_UDPLITE) += udplite_ipv4.o
 obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
 
 obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index acc353a..c53d767 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -246,553 +246,6 @@ int udp_get_port(struct sock *sk, unsigned short snum,
 	return  __udp_lib_get_port(sk, snum, udp_hash, scmp);
 }
 
-int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
-{
-	struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
-
-	return 	( !ipv6_only_sock(sk2)  &&
-		  (!inet1->rcv_saddr || !inet2->rcv_saddr ||
-		   inet1->rcv_saddr == inet2->rcv_saddr      ));
-}
-
-static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
-{
-	return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
-}
-
-/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
- * harder than this. -DaveM
- */
-static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
-		__be16 sport, __be32 daddr, __be16 dport,
-		int dif, struct hlist_head udptable[])
-{
-	struct sock *sk, *result = NULL;
-	struct hlist_node *node;
-	unsigned short hnum = ntohs(dport);
-	int badness = -1;
-
-	read_lock(&udp_hash_lock);
-	sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
-		struct inet_sock *inet = inet_sk(sk);
-
-		if (sk->sk_net == net && sk->sk_hash == hnum &&
-				!ipv6_only_sock(sk)) {
-			int score = (sk->sk_family == PF_INET ? 1 : 0);
-			if (inet->rcv_saddr) {
-				if (inet->rcv_saddr != daddr)
-					continue;
-				score+=2;
-			}
-			if (inet->daddr) {
-				if (inet->daddr != saddr)
-					continue;
-				score+=2;
-			}
-			if (inet->dport) {
-				if (inet->dport != sport)
-					continue;
-				score+=2;
-			}
-			if (sk->sk_bound_dev_if) {
-				if (sk->sk_bound_dev_if != dif)
-					continue;
-				score+=2;
-			}
-			if (score == 9) {
-				result = sk;
-				break;
-			} else if (score > badness) {
-				result = sk;
-				badness = score;
-			}
-		}
-	}
-	if (result)
-		sock_hold(result);
-	read_unlock(&udp_hash_lock);
-	return result;
-}
-
-static inline struct sock *udp_v4_mcast_next(struct sock *sk,
-					     __be16 loc_port, __be32 loc_addr,
-					     __be16 rmt_port, __be32 rmt_addr,
-					     int dif)
-{
-	struct hlist_node *node;
-	struct sock *s = sk;
-	unsigned short hnum = ntohs(loc_port);
-
-	sk_for_each_from(s, node) {
-		struct inet_sock *inet = inet_sk(s);
-
-		if (s->sk_hash != hnum					||
-		    (inet->daddr && inet->daddr != rmt_addr)		||
-		    (inet->dport != rmt_port && inet->dport)		||
-		    (inet->rcv_saddr && inet->rcv_saddr != loc_addr)	||
-		    ipv6_only_sock(s)					||
-		    (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
-			continue;
-		if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
-			continue;
-		goto found;
-	}
-	s = NULL;
-found:
-	return s;
-}
-
-/*
- * This routine is called by the ICMP module when it gets some
- * sort of error condition.  If err < 0 then the socket should
- * be closed and the error returned to the user.  If err > 0
- * it's just the icmp type << 8 | icmp code.
- * Header points to the ip header of the error packet. We move
- * on past this. Then (as it used to claim before adjustment)
- * header points to the first 8 bytes of the udp header.  We need
- * to find the appropriate port.
- */
-
-void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
-{
-	struct inet_sock *inet;
-	struct iphdr *iph = (struct iphdr*)skb->data;
-	struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
-	const int type = icmp_hdr(skb)->type;
-	const int code = icmp_hdr(skb)->code;
-	struct sock *sk;
-	int harderr;
-	int err;
-
-	sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
-			iph->saddr, uh->source, skb->dev->ifindex, udptable);
-	if (sk == NULL) {
-		ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
-		return;	/* No socket for error */
-	}
-
-	err = 0;
-	harderr = 0;
-	inet = inet_sk(sk);
-
-	switch (type) {
-	default:
-	case ICMP_TIME_EXCEEDED:
-		err = EHOSTUNREACH;
-		break;
-	case ICMP_SOURCE_QUENCH:
-		goto out;
-	case ICMP_PARAMETERPROB:
-		err = EPROTO;
-		harderr = 1;
-		break;
-	case ICMP_DEST_UNREACH:
-		if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
-			if (inet->pmtudisc != IP_PMTUDISC_DONT) {
-				err = EMSGSIZE;
-				harderr = 1;
-				break;
-			}
-			goto out;
-		}
-		err = EHOSTUNREACH;
-		if (code <= NR_ICMP_UNREACH) {
-			harderr = icmp_err_convert[code].fatal;
-			err = icmp_err_convert[code].errno;
-		}
-		break;
-	}
-
-	/*
-	 *      RFC1122: OK.  Passes ICMP errors back to application, as per
-	 *	4.1.3.3.
-	 */
-	if (!inet->recverr) {
-		if (!harderr || sk->sk_state != TCP_ESTABLISHED)
-			goto out;
-	} else {
-		ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
-	}
-	sk->sk_err = err;
-	sk->sk_error_report(sk);
-out:
-	sock_put(sk);
-}
-
-void udp_err(struct sk_buff *skb, u32 info)
-{
-	__udp4_lib_err(skb, info, udp_hash);
-}
-
-/*
- * Throw away all pending data and cancel the corking. Socket is locked.
- */
-static void udp_flush_pending_frames(struct sock *sk)
-{
-	struct udp_sock *up = udp_sk(sk);
-
-	if (up->pending) {
-		up->len = 0;
-		up->pending = 0;
-		ip_flush_pending_frames(sk);
-	}
-}
-
-/**
- * 	udp4_hwcsum_outgoing  -  handle outgoing HW checksumming
- * 	@sk: 	socket we are sending on
- * 	@skb: 	sk_buff containing the filled-in UDP header
- * 	        (checksum field must be zeroed out)
- */
-static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
-				 __be32 src, __be32 dst, int len      )
-{
-	unsigned int offset;
-	struct udphdr *uh = udp_hdr(skb);
-	__wsum csum = 0;
-
-	if (skb_queue_len(&sk->sk_write_queue) == 1) {
-		/*
-		 * Only one fragment on the socket.
-		 */
-		skb->csum_start = skb_transport_header(skb) - skb->head;
-		skb->csum_offset = offsetof(struct udphdr, check);
-		uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
-	} else {
-		/*
-		 * HW-checksum won't work as there are two or more
-		 * fragments on the socket so that all csums of sk_buffs
-		 * should be together
-		 */
-		offset = skb_transport_offset(skb);
-		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
-
-		skb->ip_summed = CHECKSUM_NONE;
-
-		skb_queue_walk(&sk->sk_write_queue, skb) {
-			csum = csum_add(csum, skb->csum);
-		}
-
-		uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
-		if (uh->check == 0)
-			uh->check = CSUM_MANGLED_0;
-	}
-}
-
-/*
- * Push out all pending data as one UDP datagram. Socket is locked.
- */
-static int udp_push_pending_frames(struct sock *sk)
-{
-	struct udp_sock  *up = udp_sk(sk);
-	struct inet_sock *inet = inet_sk(sk);
-	struct flowi *fl = &inet->cork.fl;
-	struct sk_buff *skb;
-	struct udphdr *uh;
-	int err = 0;
-	int is_udplite = IS_UDPLITE(sk);
-	__wsum csum = 0;
-
-	/* Grab the skbuff where UDP header space exists. */
-	if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
-		goto out;
-
-	/*
-	 * Create a UDP header
-	 */
-	uh = udp_hdr(skb);
-	uh->source = fl->fl_ip_sport;
-	uh->dest = fl->fl_ip_dport;
-	uh->len = htons(up->len);
-	uh->check = 0;
-
-	if (is_udplite)  				 /*     UDP-Lite      */
-		csum  = udplite_csum_outgoing(sk, skb);
-
-	else if (sk->sk_no_check == UDP_CSUM_NOXMIT) {   /* UDP csum disabled */
-
-		skb->ip_summed = CHECKSUM_NONE;
-		goto send;
-
-	} else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
-
-		udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
-		goto send;
-
-	} else						 /*   `normal' UDP    */
-		csum = udp_csum_outgoing(sk, skb);
-
-	/* add protocol-dependent pseudo-header */
-	uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
-				      sk->sk_protocol, csum             );
-	if (uh->check == 0)
-		uh->check = CSUM_MANGLED_0;
-
-send:
-	err = ip_push_pending_frames(sk);
-out:
-	up->len = 0;
-	up->pending = 0;
-	if (!err)
-		UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
-	return err;
-}
-
-int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
-		size_t len)
-{
-	struct inet_sock *inet = inet_sk(sk);
-	struct udp_sock *up = udp_sk(sk);
-	int ulen = len;
-	struct ipcm_cookie ipc;
-	struct rtable *rt = NULL;
-	int free = 0;
-	int connected = 0;
-	__be32 daddr, faddr, saddr;
-	__be16 dport;
-	u8  tos;
-	int err, is_udplite = IS_UDPLITE(sk);
-	int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
-	int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
-
-	if (len > 0xFFFF)
-		return -EMSGSIZE;
-
-	/*
-	 *	Check the flags.
-	 */
-
-	if (msg->msg_flags&MSG_OOB)	/* Mirror BSD error message compatibility */
-		return -EOPNOTSUPP;
-
-	ipc.opt = NULL;
-
-	if (up->pending) {
-		/*
-		 * There are pending frames.
-		 * The socket lock must be held while it's corked.
-		 */
-		lock_sock(sk);
-		if (likely(up->pending)) {
-			if (unlikely(up->pending != AF_INET)) {
-				release_sock(sk);
-				return -EINVAL;
-			}
-			goto do_append_data;
-		}
-		release_sock(sk);
-	}
-	ulen += sizeof(struct udphdr);
-
-	/*
-	 *	Get and verify the address.
-	 */
-	if (msg->msg_name) {
-		struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
-		if (msg->msg_namelen < sizeof(*usin))
-			return -EINVAL;
-		if (usin->sin_family != AF_INET) {
-			if (usin->sin_family != AF_UNSPEC)
-				return -EAFNOSUPPORT;
-		}
-
-		daddr = usin->sin_addr.s_addr;
-		dport = usin->sin_port;
-		if (dport == 0)
-			return -EINVAL;
-	} else {
-		if (sk->sk_state != TCP_ESTABLISHED)
-			return -EDESTADDRREQ;
-		daddr = inet->daddr;
-		dport = inet->dport;
-		/* Open fast path for connected socket.
-		   Route will not be used, if at least one option is set.
-		 */
-		connected = 1;
-	}
-	ipc.addr = inet->saddr;
-
-	ipc.oif = sk->sk_bound_dev_if;
-	if (msg->msg_controllen) {
-		err = ip_cmsg_send(msg, &ipc);
-		if (err)
-			return err;
-		if (ipc.opt)
-			free = 1;
-		connected = 0;
-	}
-	if (!ipc.opt)
-		ipc.opt = inet->opt;
-
-	saddr = ipc.addr;
-	ipc.addr = faddr = daddr;
-
-	if (ipc.opt && ipc.opt->srr) {
-		if (!daddr)
-			return -EINVAL;
-		faddr = ipc.opt->faddr;
-		connected = 0;
-	}
-	tos = RT_TOS(inet->tos);
-	if (sock_flag(sk, SOCK_LOCALROUTE) ||
-	    (msg->msg_flags & MSG_DONTROUTE) ||
-	    (ipc.opt && ipc.opt->is_strictroute)) {
-		tos |= RTO_ONLINK;
-		connected = 0;
-	}
-
-	if (ipv4_is_multicast(daddr)) {
-		if (!ipc.oif)
-			ipc.oif = inet->mc_index;
-		if (!saddr)
-			saddr = inet->mc_addr;
-		connected = 0;
-	}
-
-	if (connected)
-		rt = (struct rtable*)sk_dst_check(sk, 0);
-
-	if (rt == NULL) {
-		struct flowi fl = { .oif = ipc.oif,
-				    .nl_u = { .ip4_u =
-					      { .daddr = faddr,
-						.saddr = saddr,
-						.tos = tos } },
-				    .proto = sk->sk_protocol,
-				    .uli_u = { .ports =
-					       { .sport = inet->sport,
-						 .dport = dport } } };
-		security_sk_classify_flow(sk, &fl);
-		err = ip_route_output_flow(&init_net, &rt, &fl, sk, 1);
-		if (err) {
-			if (err == -ENETUNREACH)
-				IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
-			goto out;
-		}
-
-		err = -EACCES;
-		if ((rt->rt_flags & RTCF_BROADCAST) &&
-		    !sock_flag(sk, SOCK_BROADCAST))
-			goto out;
-		if (connected)
-			sk_dst_set(sk, dst_clone(&rt->u.dst));
-	}
-
-	if (msg->msg_flags&MSG_CONFIRM)
-		goto do_confirm;
-back_from_confirm:
-
-	saddr = rt->rt_src;
-	if (!ipc.addr)
-		daddr = ipc.addr = rt->rt_dst;
-
-	lock_sock(sk);
-	if (unlikely(up->pending)) {
-		/* The socket is already corked while preparing it. */
-		/* ... which is an evident application bug. --ANK */
-		release_sock(sk);
-
-		LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
-		err = -EINVAL;
-		goto out;
-	}
-	/*
-	 *	Now cork the socket to pend data.
-	 */
-	inet->cork.fl.fl4_dst = daddr;
-	inet->cork.fl.fl_ip_dport = dport;
-	inet->cork.fl.fl4_src = saddr;
-	inet->cork.fl.fl_ip_sport = inet->sport;
-	up->pending = AF_INET;
-
-do_append_data:
-	up->len += ulen;
-	getfrag  =  is_udplite ?  udplite_getfrag : ip_generic_getfrag;
-	err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
-			sizeof(struct udphdr), &ipc, rt,
-			corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
-	if (err)
-		udp_flush_pending_frames(sk);
-	else if (!corkreq)
-		err = udp_push_pending_frames(sk);
-	else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
-		up->pending = 0;
-	release_sock(sk);
-
-out:
-	ip_rt_put(rt);
-	if (free)
-		kfree(ipc.opt);
-	if (!err)
-		return len;
-	/*
-	 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space.  Reporting
-	 * ENOBUFS might not be good (it's not tunable per se), but otherwise
-	 * we don't have a good statistic (IpOutDiscards but it can be too many
-	 * things).  We could add another new stat but at least for now that
-	 * seems like overkill.
-	 */
-	if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
-		UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
-	}
-	return err;
-
-do_confirm:
-	dst_confirm(&rt->u.dst);
-	if (!(msg->msg_flags&MSG_PROBE) || len)
-		goto back_from_confirm;
-	err = 0;
-	goto out;
-}
-
-int udp_sendpage(struct sock *sk, struct page *page, int offset,
-		 size_t size, int flags)
-{
-	struct udp_sock *up = udp_sk(sk);
-	int ret;
-
-	if (!up->pending) {
-		struct msghdr msg = {	.msg_flags = flags|MSG_MORE };
-
-		/* Call udp_sendmsg to specify destination address which
-		 * sendpage interface can't pass.
-		 * This will succeed only when the socket is connected.
-		 */
-		ret = udp_sendmsg(NULL, sk, &msg, 0);
-		if (ret < 0)
-			return ret;
-	}
-
-	lock_sock(sk);
-
-	if (unlikely(!up->pending)) {
-		release_sock(sk);
-
-		LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
-		return -EINVAL;
-	}
-
-	ret = ip_append_page(sk, page, offset, size, flags);
-	if (ret == -EOPNOTSUPP) {
-		release_sock(sk);
-		return sock_no_sendpage(sk->sk_socket, page, offset,
-					size, flags);
-	}
-	if (ret < 0) {
-		udp_flush_pending_frames(sk);
-		goto out;
-	}
-
-	up->len += size;
-	if (!(up->corkflag || (flags&MSG_MORE)))
-		ret = udp_push_pending_frames(sk);
-	if (!ret)
-		ret = size;
-out:
-	release_sock(sk);
-	return ret;
-}
-
 /*
  *	IOCTL requests applicable to the UDP protocol
  */
@@ -833,107 +286,6 @@ int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
 	return 0;
 }
 
-/*
- * 	This should be easy, if there is something there we
- * 	return it, otherwise we block.
- */
-
-int udp_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);
-	struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
-	struct sk_buff *skb;
-	unsigned int ulen, copied;
-	int peeked;
-	int err;
-	int is_udplite = IS_UDPLITE(sk);
-
-	/*
-	 *	Check any passed addresses
-	 */
-	if (addr_len)
-		*addr_len=sizeof(*sin);
-
-	if (flags & MSG_ERRQUEUE)
-		return ip_recv_error(sk, msg, len);
-
-try_again:
-	skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
-				  &peeked, &err);
-	if (!skb)
-		goto out;
-
-	ulen = skb->len - sizeof(struct udphdr);
-	copied = len;
-	if (copied > ulen)
-		copied = ulen;
-	else if (copied < ulen)
-		msg->msg_flags |= MSG_TRUNC;
-
-	/*
-	 * If checksum is needed at all, try to do it while copying the
-	 * data.  If the data is truncated, or if we only want a partial
-	 * coverage checksum (UDP-Lite), do it before the copy.
-	 */
-
-	if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
-		if (udp_lib_checksum_complete(skb))
-			goto csum_copy_err;
-	}
-
-	if (skb_csum_unnecessary(skb))
-		err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
-					      msg->msg_iov, copied       );
-	else {
-		err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
-
-		if (err == -EINVAL)
-			goto csum_copy_err;
-	}
-
-	if (err)
-		goto out_free;
-
-	if (!peeked)
-		UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
-
-	sock_recv_timestamp(msg, sk, skb);
-
-	/* Copy the address. */
-	if (sin)
-	{
-		sin->sin_family = AF_INET;
-		sin->sin_port = udp_hdr(skb)->source;
-		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
-		memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
-	}
-	if (inet->cmsg_flags)
-		ip_cmsg_recv(msg, skb);
-
-	err = copied;
-	if (flags & MSG_TRUNC)
-		err = ulen;
-
-out_free:
-	lock_sock(sk);
-	skb_free_datagram(sk, skb);
-	release_sock(sk);
-out:
-	return err;
-
-csum_copy_err:
-	lock_sock(sk);
-	if (!skb_kill_datagram(sk, skb, flags))
-		UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
-	release_sock(sk);
-
-	if (noblock)
-		return -EAGAIN;
-	goto try_again;
-}
-
-
 int udp_disconnect(struct sock *sk, int flags)
 {
 	struct inet_sock *inet = inet_sk(sk);
@@ -956,319 +308,6 @@ int udp_disconnect(struct sock *sk, int flags)
 	return 0;
 }
 
-/* returns:
- *  -1: error
- *   0: success
- *  >0: "udp encap" protocol resubmission
- *
- * Note that in the success and error cases, the skb is assumed to
- * have either been requeued or freed.
- */
-int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
-{
-	struct udp_sock *up = udp_sk(sk);
-	int rc;
-	int is_udplite = IS_UDPLITE(sk);
-
-	/*
-	 *	Charge it to the socket, dropping if the queue is full.
-	 */
-	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
-		goto drop;
-	nf_reset(skb);
-
-	if (up->encap_type) {
-		/*
-		 * This is an encapsulation socket so pass the skb to
-		 * the socket's udp_encap_rcv() hook. Otherwise, just
-		 * fall through and pass this up the UDP socket.
-		 * up->encap_rcv() returns the following value:
-		 * =0 if skb was successfully passed to the encap
-		 *    handler or was discarded by it.
-		 * >0 if skb should be passed on to UDP.
-		 * <0 if skb should be resubmitted as proto -N
-		 */
-
-		/* if we're overly short, let UDP handle it */
-		if (skb->len > sizeof(struct udphdr) &&
-		    up->encap_rcv != NULL) {
-			int ret;
-
-			ret = (*up->encap_rcv)(sk, skb);
-			if (ret <= 0) {
-				UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS,
-						 is_udplite);
-				return -ret;
-			}
-		}
-
-		/* FALLTHROUGH -- it's a UDP Packet */
-	}
-
-	/*
-	 * 	UDP-Lite specific tests, ignored on UDP sockets
-	 */
-	if ((is_udplite & UDPLITE_RECV_CC)  &&  UDP_SKB_CB(skb)->partial_cov) {
-
-		/*
-		 * MIB statistics other than incrementing the error count are
-		 * disabled for the following two types of errors: these depend
-		 * on the application settings, not on the functioning of the
-		 * protocol stack as such.
-		 *
-		 * RFC 3828 here recommends (sec 3.3): "There should also be a
-		 * way ... to ... at least let the receiving application block
-		 * delivery of packets with coverage values less than a value
-		 * provided by the application."
-		 */
-		if (up->pcrlen == 0) {          /* full coverage was set  */
-			LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
-				"%d while full coverage %d requested\n",
-				UDP_SKB_CB(skb)->cscov, skb->len);
-			goto drop;
-		}
-		/* The next case involves violating the min. coverage requested
-		 * by the receiver. This is subtle: if receiver wants x and x is
-		 * greater than the buffersize/MTU then receiver will complain
-		 * that it wants x while sender emits packets of smaller size y.
-		 * Therefore the above ...()->partial_cov statement is essential.
-		 */
-		if (UDP_SKB_CB(skb)->cscov  <  up->pcrlen) {
-			LIMIT_NETDEBUG(KERN_WARNING
-				"UDPLITE: coverage %d too small, need min %d\n",
-				UDP_SKB_CB(skb)->cscov, up->pcrlen);
-			goto drop;
-		}
-	}
-
-	if (sk->sk_filter) {
-		if (udp_lib_checksum_complete(skb))
-			goto drop;
-	}
-
-	if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
-		/* Note that an ENOMEM error is charged twice */
-		if (rc == -ENOMEM)
-			UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
-		goto drop;
-	}
-
-	return 0;
-
-drop:
-	UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
-	kfree_skb(skb);
-	return -1;
-}
-
-/*
- *	Multicasts and broadcasts go to each listener.
- *
- *	Note: called only from the BH handler context,
- *	so we don't need to lock the hashes.
- */
-static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
-				    struct udphdr  *uh,
-				    __be32 saddr, __be32 daddr,
-				    struct hlist_head udptable[])
-{
-	struct sock *sk;
-	int dif;
-
-	read_lock(&udp_hash_lock);
-	sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
-	dif = skb->dev->ifindex;
-	sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
-	if (sk) {
-		struct sock *sknext = NULL;
-
-		do {
-			struct sk_buff *skb1 = skb;
-
-			sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
-						   uh->source, saddr, dif);
-			if (sknext)
-				skb1 = skb_clone(skb, GFP_ATOMIC);
-
-			if (skb1) {
-				int ret = 0;
-
-				bh_lock_sock_nested(sk);
-				if (!sock_owned_by_user(sk))
-					ret = udp_queue_rcv_skb(sk, skb1);
-				else
-					sk_add_backlog(sk, skb1);
-				bh_unlock_sock(sk);
-
-				if (ret > 0)
-					/* we should probably re-process instead
-					 * of dropping packets here. */
-					kfree_skb(skb1);
-			}
-			sk = sknext;
-		} while (sknext);
-	} else
-		kfree_skb(skb);
-	read_unlock(&udp_hash_lock);
-	return 0;
-}
-
-/* Initialize UDP checksum. If exited with zero value (success),
- * CHECKSUM_UNNECESSARY means, that no more checks are required.
- * Otherwise, csum completion requires chacksumming packet body,
- * including udp header and folding it to skb->csum.
- */
-static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
-				 int proto)
-{
-	const struct iphdr *iph;
-	int err;
-
-	UDP_SKB_CB(skb)->partial_cov = 0;
-	UDP_SKB_CB(skb)->cscov = skb->len;
-
-	if (IS_PROTO_UDPLITE(proto)) {
-		err = udplite_checksum_init(skb, uh);
-		if (err)
-			return err;
-	}
-
-	iph = ip_hdr(skb);
-	if (uh->check == 0) {
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
-	} else if (skb->ip_summed == CHECKSUM_COMPLETE) {
-	       if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
-				      proto, skb->csum))
-			skb->ip_summed = CHECKSUM_UNNECESSARY;
-	}
-	if (!skb_csum_unnecessary(skb))
-		skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
-					       skb->len, proto, 0);
-	/* Probably, we should checksum udp header (it should be in cache
-	 * in any case) and data in tiny packets (< rx copybreak).
-	 */
-
-	return 0;
-}
-
-/*
- *	All we need to do is get the socket, and then do a checksum.
- */
-
-int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
-		   int proto)
-{
-	struct sock *sk;
-	struct udphdr *uh = udp_hdr(skb);
-	unsigned short ulen;
-	struct rtable *rt = (struct rtable*)skb->dst;
-	__be32 saddr = ip_hdr(skb)->saddr;
-	__be32 daddr = ip_hdr(skb)->daddr;
-
-	/*
-	 *  Validate the packet.
-	 */
-	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
-		goto drop;		/* No space for header. */
-
-	ulen = ntohs(uh->len);
-	if (ulen > skb->len)
-		goto short_packet;
-
-	if (IS_PROTO_UDPLITE(proto)) {
-		/* UDP validates ulen. */
-		if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
-			goto short_packet;
-		uh = udp_hdr(skb);
-	}
-
-	if (udp4_csum_init(skb, uh, proto))
-		goto csum_error;
-
-	if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
-		return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
-
-	sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
-			uh->dest, inet_iif(skb), udptable);
-
-	if (sk != NULL) {
-		int ret = 0;
-		bh_lock_sock_nested(sk);
-		if (!sock_owned_by_user(sk))
-			ret = udp_queue_rcv_skb(sk, skb);
-		else
-			sk_add_backlog(sk, skb);
-		bh_unlock_sock(sk);
-		sock_put(sk);
-
-		/* a return value > 0 means to resubmit the input, but
-		 * it wants the return to be -protocol, or 0
-		 */
-		if (ret > 0)
-			return -ret;
-		return 0;
-	}
-
-	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
-		goto drop;
-	nf_reset(skb);
-
-	/* No socket. Drop packet silently, if checksum is wrong */
-	if (udp_lib_checksum_complete(skb))
-		goto csum_error;
-
-	UDP_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
-	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-
-	/*
-	 * Hmm.  We got an UDP packet to a port to which we
-	 * don't wanna listen.  Ignore it.
-	 */
-	kfree_skb(skb);
-	return 0;
-
-short_packet:
-	LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
-		       IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
-		       NIPQUAD(saddr),
-		       ntohs(uh->source),
-		       ulen,
-		       skb->len,
-		       NIPQUAD(daddr),
-		       ntohs(uh->dest));
-	goto drop;
-
-csum_error:
-	/*
-	 * RFC1122: OK.  Discards the bad packet silently (as far as
-	 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
-	 */
-	LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
-		       IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
-		       NIPQUAD(saddr),
-		       ntohs(uh->source),
-		       NIPQUAD(daddr),
-		       ntohs(uh->dest),
-		       ulen);
-drop:
-	UDP_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
-	kfree_skb(skb);
-	return 0;
-}
-
-int udp_rcv(struct sk_buff *skb)
-{
-	return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
-}
-
-int udp_destroy_sock(struct sock *sk)
-{
-	lock_sock(sk);
-	udp_flush_pending_frames(sk);
-	release_sock(sk);
-	return 0;
-}
-
 /*
  *	Socket option code for UDP
  */
@@ -1353,26 +392,6 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 	return err;
 }
 
-int udp_setsockopt(struct sock *sk, int level, int optname,
-		   char __user *optval, int optlen)
-{
-	if (IS_SOL_UDPFAMILY(level))
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
-					  udp_push_pending_frames);
-	return ip_setsockopt(sk, level, optname, optval, optlen);
-}
-
-#ifdef CONFIG_COMPAT
-int compat_udp_setsockopt(struct sock *sk, int level, int optname,
-			  char __user *optval, int optlen)
-{
-	if (IS_SOL_UDPFAMILY(level))
-		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
-					  udp_push_pending_frames);
-	return compat_ip_setsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
 int udp_lib_getsockopt(struct sock *sk, int level, int optname,
 		       char __user *optval, int __user *optlen)
 {
@@ -1417,23 +436,6 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
 	return 0;
 }
 
-int udp_getsockopt(struct sock *sk, int level, int optname,
-		   char __user *optval, int __user *optlen)
-{
-	if (IS_SOL_UDPFAMILY(level))
-		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
-	return ip_getsockopt(sk, level, optname, optval, optlen);
-}
-
-#ifdef CONFIG_COMPAT
-int compat_udp_getsockopt(struct sock *sk, int level, int optname,
-				 char __user *optval, int __user *optlen)
-{
-	if (IS_SOL_UDPFAMILY(level))
-		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
-	return compat_ip_getsockopt(sk, level, optname, optval, optlen);
-}
-#endif
 /**
  * 	udp_poll - wait for a UDP event.
  *	@file - file struct
@@ -1478,36 +480,6 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
 
 }
 
-DEFINE_PROTO_INUSE(udp)
-
-struct proto udp_prot = {
-	.name		   = "UDP",
-	.owner		   = THIS_MODULE,
-	.close		   = udp_lib_close,
-	.connect	   = ip4_datagram_connect,
-	.disconnect	   = udp_disconnect,
-	.ioctl		   = udp_ioctl,
-	.destroy	   = udp_destroy_sock,
-	.setsockopt	   = udp_setsockopt,
-	.getsockopt	   = udp_getsockopt,
-	.sendmsg	   = udp_sendmsg,
-	.recvmsg	   = udp_recvmsg,
-	.sendpage	   = udp_sendpage,
-	.backlog_rcv	   = udp_queue_rcv_skb,
-	.hash		   = udp_lib_hash,
-	.unhash		   = udp_lib_unhash,
-	.get_port	   = udp_v4_get_port,
-	.memory_allocated  = &udp_memory_allocated,
-	.sysctl_mem	   = sysctl_udp_mem,
-	.sysctl_wmem	   = &sysctl_udp_wmem_min,
-	.sysctl_rmem	   = &sysctl_udp_rmem_min,
-	.obj_size	   = sizeof(struct udp_sock),
-#ifdef CONFIG_COMPAT
-	.compat_setsockopt = compat_udp_setsockopt,
-	.compat_getsockopt = compat_udp_getsockopt,
-#endif
-	REF_PROTO_INUSE(udp)
-};
 
 /* ------------------------------------------------------------------------ */
 #ifdef CONFIG_PROC_FS
@@ -1640,62 +612,6 @@ void udp_proc_unregister(struct udp_seq_afinfo *afinfo)
 	proc_net_remove(&init_net, afinfo->name);
 	memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
 }
-
-/* ------------------------------------------------------------------------ */
-static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
-{
-	struct inet_sock *inet = inet_sk(sp);
-	__be32 dest = inet->daddr;
-	__be32 src  = inet->rcv_saddr;
-	__u16 destp	  = ntohs(inet->dport);
-	__u16 srcp	  = ntohs(inet->sport);
-
-	sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
-		" %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
-		bucket, 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);
-}
-
-int udp4_seq_show(struct seq_file *seq, void *v)
-{
-	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 {
-		char tmpbuf[129];
-		struct udp_iter_state *state = seq->private;
-
-		udp4_format_sock(v, tmpbuf, state->bucket);
-		seq_printf(seq, "%-127s\n", tmpbuf);
-	}
-	return 0;
-}
-
-/* ------------------------------------------------------------------------ */
-static struct file_operations udp4_seq_fops;
-static struct udp_seq_afinfo udp4_seq_afinfo = {
-	.owner		= THIS_MODULE,
-	.name		= "udp",
-	.family		= AF_INET,
-	.hashtable	= udp_hash,
-	.seq_show	= udp4_seq_show,
-	.seq_fops	= &udp4_seq_fops,
-};
-
-int __init udp4_proc_init(void)
-{
-	return udp_proc_register(&udp4_seq_afinfo);
-}
-
-void udp4_proc_exit(void)
-{
-	udp_proc_unregister(&udp4_seq_afinfo);
-}
 #endif /* CONFIG_PROC_FS */
 
 void __init udp_init(void)
@@ -1722,8 +638,6 @@ EXPORT_SYMBOL(udp_hash);
 EXPORT_SYMBOL(udp_hash_lock);
 EXPORT_SYMBOL(udp_ioctl);
 EXPORT_SYMBOL(udp_get_port);
-EXPORT_SYMBOL(udp_prot);
-EXPORT_SYMBOL(udp_sendmsg);
 EXPORT_SYMBOL(udp_lib_getsockopt);
 EXPORT_SYMBOL(udp_lib_setsockopt);
 EXPORT_SYMBOL(udp_poll);
diff --git a/net/ipv4/udp_ipv4.c b/net/ipv4/udp_ipv4.c
new file mode 100644
index 0000000..40978de
--- /dev/null
+++ b/net/ipv4/udp_ipv4.c
@@ -0,0 +1,1134 @@
+/*
+ * 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.
+ *
+ *		UDP for IPv4.
+ *
+ *		For full credits, see net/ipv4/udp.c.
+ *
+ *		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 <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+#include <linux/bootmem.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/igmp.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <net/tcp_states.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <net/net_namespace.h>
+#include <net/icmp.h>
+#include <net/route.h>
+#include <net/checksum.h>
+#include <net/xfrm.h>
+#include "udp_impl.h"
+
+int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
+{
+	struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
+
+	return 	( !ipv6_only_sock(sk2)  &&
+		  (!inet1->rcv_saddr || !inet2->rcv_saddr ||
+		   inet1->rcv_saddr == inet2->rcv_saddr      ));
+}
+
+static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
+{
+	return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
+}
+
+/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
+ * harder than this. -DaveM
+ */
+static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
+		__be16 sport, __be32 daddr, __be16 dport,
+		int dif, struct hlist_head udptable[])
+{
+	struct sock *sk, *result = NULL;
+	struct hlist_node *node;
+	unsigned short hnum = ntohs(dport);
+	int badness = -1;
+
+	read_lock(&udp_hash_lock);
+	sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
+		struct inet_sock *inet = inet_sk(sk);
+
+		if (sk->sk_net == net && sk->sk_hash == hnum &&
+				!ipv6_only_sock(sk)) {
+			int score = (sk->sk_family == PF_INET ? 1 : 0);
+			if (inet->rcv_saddr) {
+				if (inet->rcv_saddr != daddr)
+					continue;
+				score+=2;
+			}
+			if (inet->daddr) {
+				if (inet->daddr != saddr)
+					continue;
+				score+=2;
+			}
+			if (inet->dport) {
+				if (inet->dport != sport)
+					continue;
+				score+=2;
+			}
+			if (sk->sk_bound_dev_if) {
+				if (sk->sk_bound_dev_if != dif)
+					continue;
+				score+=2;
+			}
+			if (score == 9) {
+				result = sk;
+				break;
+			} else if (score > badness) {
+				result = sk;
+				badness = score;
+			}
+		}
+	}
+	if (result)
+		sock_hold(result);
+	read_unlock(&udp_hash_lock);
+	return result;
+}
+
+static inline struct sock *udp_v4_mcast_next(struct sock *sk,
+					     __be16 loc_port, __be32 loc_addr,
+					     __be16 rmt_port, __be32 rmt_addr,
+					     int dif)
+{
+	struct hlist_node *node;
+	struct sock *s = sk;
+	unsigned short hnum = ntohs(loc_port);
+
+	sk_for_each_from(s, node) {
+		struct inet_sock *inet = inet_sk(s);
+
+		if (s->sk_hash != hnum					||
+		    (inet->daddr && inet->daddr != rmt_addr)		||
+		    (inet->dport != rmt_port && inet->dport)		||
+		    (inet->rcv_saddr && inet->rcv_saddr != loc_addr)	||
+		    ipv6_only_sock(s)					||
+		    (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
+			continue;
+		if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
+			continue;
+		goto found;
+	}
+	s = NULL;
+found:
+	return s;
+}
+
+/*
+ * This routine is called by the ICMP module when it gets some
+ * sort of error condition.  If err < 0 then the socket should
+ * be closed and the error returned to the user.  If err > 0
+ * it's just the icmp type << 8 | icmp code.
+ * Header points to the ip header of the error packet. We move
+ * on past this. Then (as it used to claim before adjustment)
+ * header points to the first 8 bytes of the udp header.  We need
+ * to find the appropriate port.
+ */
+
+void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
+{
+	struct inet_sock *inet;
+	struct iphdr *iph = (struct iphdr*)skb->data;
+	struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
+	const int type = icmp_hdr(skb)->type;
+	const int code = icmp_hdr(skb)->code;
+	struct sock *sk;
+	int harderr;
+	int err;
+
+	sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
+			iph->saddr, uh->source, skb->dev->ifindex, udptable);
+	if (sk == NULL) {
+		ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
+		return;	/* No socket for error */
+	}
+
+	err = 0;
+	harderr = 0;
+	inet = inet_sk(sk);
+
+	switch (type) {
+	default:
+	case ICMP_TIME_EXCEEDED:
+		err = EHOSTUNREACH;
+		break;
+	case ICMP_SOURCE_QUENCH:
+		goto out;
+	case ICMP_PARAMETERPROB:
+		err = EPROTO;
+		harderr = 1;
+		break;
+	case ICMP_DEST_UNREACH:
+		if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
+			if (inet->pmtudisc != IP_PMTUDISC_DONT) {
+				err = EMSGSIZE;
+				harderr = 1;
+				break;
+			}
+			goto out;
+		}
+		err = EHOSTUNREACH;
+		if (code <= NR_ICMP_UNREACH) {
+			harderr = icmp_err_convert[code].fatal;
+			err = icmp_err_convert[code].errno;
+		}
+		break;
+	}
+
+	/*
+	 *      RFC1122: OK.  Passes ICMP errors back to application, as per
+	 *	4.1.3.3.
+	 */
+	if (!inet->recverr) {
+		if (!harderr || sk->sk_state != TCP_ESTABLISHED)
+			goto out;
+	} else {
+		ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
+	}
+	sk->sk_err = err;
+	sk->sk_error_report(sk);
+out:
+	sock_put(sk);
+}
+
+void udp_err(struct sk_buff *skb, u32 info)
+{
+	__udp4_lib_err(skb, info, udp_hash);
+}
+
+/*
+ * Throw away all pending data and cancel the corking. Socket is locked.
+ */
+static void udp_flush_pending_frames(struct sock *sk)
+{
+	struct udp_sock *up = udp_sk(sk);
+
+	if (up->pending) {
+		up->len = 0;
+		up->pending = 0;
+		ip_flush_pending_frames(sk);
+	}
+}
+
+/**
+ * 	udp4_hwcsum_outgoing  -  handle outgoing HW checksumming
+ * 	@sk: 	socket we are sending on
+ * 	@skb: 	sk_buff containing the filled-in UDP header
+ * 	        (checksum field must be zeroed out)
+ */
+static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
+				 __be32 src, __be32 dst, int len      )
+{
+	unsigned int offset;
+	struct udphdr *uh = udp_hdr(skb);
+	__wsum csum = 0;
+
+	if (skb_queue_len(&sk->sk_write_queue) == 1) {
+		/*
+		 * Only one fragment on the socket.
+		 */
+		skb->csum_start = skb_transport_header(skb) - skb->head;
+		skb->csum_offset = offsetof(struct udphdr, check);
+		uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
+	} else {
+		/*
+		 * HW-checksum won't work as there are two or more
+		 * fragments on the socket so that all csums of sk_buffs
+		 * should be together
+		 */
+		offset = skb_transport_offset(skb);
+		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+
+		skb->ip_summed = CHECKSUM_NONE;
+
+		skb_queue_walk(&sk->sk_write_queue, skb) {
+			csum = csum_add(csum, skb->csum);
+		}
+
+		uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
+		if (uh->check == 0)
+			uh->check = CSUM_MANGLED_0;
+	}
+}
+
+/*
+ * Push out all pending data as one UDP datagram. Socket is locked.
+ */
+static int udp_push_pending_frames(struct sock *sk)
+{
+	struct udp_sock  *up = udp_sk(sk);
+	struct inet_sock *inet = inet_sk(sk);
+	struct flowi *fl = &inet->cork.fl;
+	struct sk_buff *skb;
+	struct udphdr *uh;
+	int err = 0;
+	int is_udplite = IS_UDPLITE(sk);
+	__wsum csum = 0;
+
+	/* Grab the skbuff where UDP header space exists. */
+	if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
+		goto out;
+
+	/*
+	 * Create a UDP header
+	 */
+	uh = udp_hdr(skb);
+	uh->source = fl->fl_ip_sport;
+	uh->dest = fl->fl_ip_dport;
+	uh->len = htons(up->len);
+	uh->check = 0;
+
+	if (is_udplite)  				 /*     UDP-Lite      */
+		csum  = udplite_csum_outgoing(sk, skb);
+
+	else if (sk->sk_no_check == UDP_CSUM_NOXMIT) {   /* UDP csum disabled */
+
+		skb->ip_summed = CHECKSUM_NONE;
+		goto send;
+
+	} else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
+
+		udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
+		goto send;
+
+	} else						 /*   `normal' UDP    */
+		csum = udp_csum_outgoing(sk, skb);
+
+	/* add protocol-dependent pseudo-header */
+	uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
+				      sk->sk_protocol, csum             );
+	if (uh->check == 0)
+		uh->check = CSUM_MANGLED_0;
+
+send:
+	err = ip_push_pending_frames(sk);
+out:
+	up->len = 0;
+	up->pending = 0;
+	if (!err)
+		UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
+	return err;
+}
+
+int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+		size_t len)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct udp_sock *up = udp_sk(sk);
+	int ulen = len;
+	struct ipcm_cookie ipc;
+	struct rtable *rt = NULL;
+	int free = 0;
+	int connected = 0;
+	__be32 daddr, faddr, saddr;
+	__be16 dport;
+	u8  tos;
+	int err, is_udplite = IS_UDPLITE(sk);
+	int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
+	int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
+
+	if (len > 0xFFFF)
+		return -EMSGSIZE;
+
+	/*
+	 *	Check the flags.
+	 */
+
+	if (msg->msg_flags&MSG_OOB)	/* Mirror BSD error message compatibility */
+		return -EOPNOTSUPP;
+
+	ipc.opt = NULL;
+
+	if (up->pending) {
+		/*
+		 * There are pending frames.
+		 * The socket lock must be held while it's corked.
+		 */
+		lock_sock(sk);
+		if (likely(up->pending)) {
+			if (unlikely(up->pending != AF_INET)) {
+				release_sock(sk);
+				return -EINVAL;
+			}
+			goto do_append_data;
+		}
+		release_sock(sk);
+	}
+	ulen += sizeof(struct udphdr);
+
+	/*
+	 *	Get and verify the address.
+	 */
+	if (msg->msg_name) {
+		struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
+		if (msg->msg_namelen < sizeof(*usin))
+			return -EINVAL;
+		if (usin->sin_family != AF_INET) {
+			if (usin->sin_family != AF_UNSPEC)
+				return -EAFNOSUPPORT;
+		}
+
+		daddr = usin->sin_addr.s_addr;
+		dport = usin->sin_port;
+		if (dport == 0)
+			return -EINVAL;
+	} else {
+		if (sk->sk_state != TCP_ESTABLISHED)
+			return -EDESTADDRREQ;
+		daddr = inet->daddr;
+		dport = inet->dport;
+		/* Open fast path for connected socket.
+		   Route will not be used, if at least one option is set.
+		 */
+		connected = 1;
+	}
+	ipc.addr = inet->saddr;
+
+	ipc.oif = sk->sk_bound_dev_if;
+	if (msg->msg_controllen) {
+		err = ip_cmsg_send(msg, &ipc);
+		if (err)
+			return err;
+		if (ipc.opt)
+			free = 1;
+		connected = 0;
+	}
+	if (!ipc.opt)
+		ipc.opt = inet->opt;
+
+	saddr = ipc.addr;
+	ipc.addr = faddr = daddr;
+
+	if (ipc.opt && ipc.opt->srr) {
+		if (!daddr)
+			return -EINVAL;
+		faddr = ipc.opt->faddr;
+		connected = 0;
+	}
+	tos = RT_TOS(inet->tos);
+	if (sock_flag(sk, SOCK_LOCALROUTE) ||
+	    (msg->msg_flags & MSG_DONTROUTE) ||
+	    (ipc.opt && ipc.opt->is_strictroute)) {
+		tos |= RTO_ONLINK;
+		connected = 0;
+	}
+
+	if (ipv4_is_multicast(daddr)) {
+		if (!ipc.oif)
+			ipc.oif = inet->mc_index;
+		if (!saddr)
+			saddr = inet->mc_addr;
+		connected = 0;
+	}
+
+	if (connected)
+		rt = (struct rtable*)sk_dst_check(sk, 0);
+
+	if (rt == NULL) {
+		struct flowi fl = { .oif = ipc.oif,
+				    .nl_u = { .ip4_u =
+					      { .daddr = faddr,
+						.saddr = saddr,
+						.tos = tos } },
+				    .proto = sk->sk_protocol,
+				    .uli_u = { .ports =
+					       { .sport = inet->sport,
+						 .dport = dport } } };
+		security_sk_classify_flow(sk, &fl);
+		err = ip_route_output_flow(&init_net, &rt, &fl, sk, 1);
+		if (err) {
+			if (err == -ENETUNREACH)
+				IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
+			goto out;
+		}
+
+		err = -EACCES;
+		if ((rt->rt_flags & RTCF_BROADCAST) &&
+		    !sock_flag(sk, SOCK_BROADCAST))
+			goto out;
+		if (connected)
+			sk_dst_set(sk, dst_clone(&rt->u.dst));
+	}
+
+	if (msg->msg_flags&MSG_CONFIRM)
+		goto do_confirm;
+back_from_confirm:
+
+	saddr = rt->rt_src;
+	if (!ipc.addr)
+		daddr = ipc.addr = rt->rt_dst;
+
+	lock_sock(sk);
+	if (unlikely(up->pending)) {
+		/* The socket is already corked while preparing it. */
+		/* ... which is an evident application bug. --ANK */
+		release_sock(sk);
+
+		LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
+		err = -EINVAL;
+		goto out;
+	}
+	/*
+	 *	Now cork the socket to pend data.
+	 */
+	inet->cork.fl.fl4_dst = daddr;
+	inet->cork.fl.fl_ip_dport = dport;
+	inet->cork.fl.fl4_src = saddr;
+	inet->cork.fl.fl_ip_sport = inet->sport;
+	up->pending = AF_INET;
+
+do_append_data:
+	up->len += ulen;
+	getfrag  =  is_udplite ?  udplite_getfrag : ip_generic_getfrag;
+	err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
+			sizeof(struct udphdr), &ipc, rt,
+			corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
+	if (err)
+		udp_flush_pending_frames(sk);
+	else if (!corkreq)
+		err = udp_push_pending_frames(sk);
+	else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
+		up->pending = 0;
+	release_sock(sk);
+
+out:
+	ip_rt_put(rt);
+	if (free)
+		kfree(ipc.opt);
+	if (!err)
+		return len;
+	/*
+	 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space.  Reporting
+	 * ENOBUFS might not be good (it's not tunable per se), but otherwise
+	 * we don't have a good statistic (IpOutDiscards but it can be too many
+	 * things).  We could add another new stat but at least for now that
+	 * seems like overkill.
+	 */
+	if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
+		UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
+	}
+	return err;
+
+do_confirm:
+	dst_confirm(&rt->u.dst);
+	if (!(msg->msg_flags&MSG_PROBE) || len)
+		goto back_from_confirm;
+	err = 0;
+	goto out;
+}
+
+int udp_sendpage(struct sock *sk, struct page *page, int offset,
+		 size_t size, int flags)
+{
+	struct udp_sock *up = udp_sk(sk);
+	int ret;
+
+	if (!up->pending) {
+		struct msghdr msg = {	.msg_flags = flags|MSG_MORE };
+
+		/* Call udp_sendmsg to specify destination address which
+		 * sendpage interface can't pass.
+		 * This will succeed only when the socket is connected.
+		 */
+		ret = udp_sendmsg(NULL, sk, &msg, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	lock_sock(sk);
+
+	if (unlikely(!up->pending)) {
+		release_sock(sk);
+
+		LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
+		return -EINVAL;
+	}
+
+	ret = ip_append_page(sk, page, offset, size, flags);
+	if (ret == -EOPNOTSUPP) {
+		release_sock(sk);
+		return sock_no_sendpage(sk->sk_socket, page, offset,
+					size, flags);
+	}
+	if (ret < 0) {
+		udp_flush_pending_frames(sk);
+		goto out;
+	}
+
+	up->len += size;
+	if (!(up->corkflag || (flags&MSG_MORE)))
+		ret = udp_push_pending_frames(sk);
+	if (!ret)
+		ret = size;
+out:
+	release_sock(sk);
+	return ret;
+}
+
+/*
+ * 	This should be easy, if there is something there we
+ * 	return it, otherwise we block.
+ */
+
+int udp_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);
+	struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
+	struct sk_buff *skb;
+	unsigned int ulen, copied;
+	int peeked;
+	int err;
+	int is_udplite = IS_UDPLITE(sk);
+
+	/*
+	 *	Check any passed addresses
+	 */
+	if (addr_len)
+		*addr_len=sizeof(*sin);
+
+	if (flags & MSG_ERRQUEUE)
+		return ip_recv_error(sk, msg, len);
+
+try_again:
+	skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
+				  &peeked, &err);
+	if (!skb)
+		goto out;
+
+	ulen = skb->len - sizeof(struct udphdr);
+	copied = len;
+	if (copied > ulen)
+		copied = ulen;
+	else if (copied < ulen)
+		msg->msg_flags |= MSG_TRUNC;
+
+	/*
+	 * If checksum is needed at all, try to do it while copying the
+	 * data.  If the data is truncated, or if we only want a partial
+	 * coverage checksum (UDP-Lite), do it before the copy.
+	 */
+
+	if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
+		if (udp_lib_checksum_complete(skb))
+			goto csum_copy_err;
+	}
+
+	if (skb_csum_unnecessary(skb))
+		err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
+					      msg->msg_iov, copied       );
+	else {
+		err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
+
+		if (err == -EINVAL)
+			goto csum_copy_err;
+	}
+
+	if (err)
+		goto out_free;
+
+	if (!peeked)
+		UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
+
+	sock_recv_timestamp(msg, sk, skb);
+
+	/* Copy the address. */
+	if (sin)
+	{
+		sin->sin_family = AF_INET;
+		sin->sin_port = udp_hdr(skb)->source;
+		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+		memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+	}
+	if (inet->cmsg_flags)
+		ip_cmsg_recv(msg, skb);
+
+	err = copied;
+	if (flags & MSG_TRUNC)
+		err = ulen;
+
+out_free:
+	lock_sock(sk);
+	skb_free_datagram(sk, skb);
+	release_sock(sk);
+out:
+	return err;
+
+csum_copy_err:
+	lock_sock(sk);
+	if (!skb_kill_datagram(sk, skb, flags))
+		UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
+	release_sock(sk);
+
+	if (noblock)
+		return -EAGAIN;
+	goto try_again;
+}
+
+
+/* returns:
+ *  -1: error
+ *   0: success
+ *  >0: "udp encap" protocol resubmission
+ *
+ * Note that in the success and error cases, the skb is assumed to
+ * have either been requeued or freed.
+ */
+int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
+{
+	struct udp_sock *up = udp_sk(sk);
+	int rc;
+	int is_udplite = IS_UDPLITE(sk);
+
+	/*
+	 *	Charge it to the socket, dropping if the queue is full.
+	 */
+	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
+		goto drop;
+	nf_reset(skb);
+
+	if (up->encap_type) {
+		/*
+		 * This is an encapsulation socket so pass the skb to
+		 * the socket's udp_encap_rcv() hook. Otherwise, just
+		 * fall through and pass this up the UDP socket.
+		 * up->encap_rcv() returns the following value:
+		 * =0 if skb was successfully passed to the encap
+		 *    handler or was discarded by it.
+		 * >0 if skb should be passed on to UDP.
+		 * <0 if skb should be resubmitted as proto -N
+		 */
+
+		/* if we're overly short, let UDP handle it */
+		if (skb->len > sizeof(struct udphdr) &&
+		    up->encap_rcv != NULL) {
+			int ret;
+
+			ret = (*up->encap_rcv)(sk, skb);
+			if (ret <= 0) {
+				UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS,
+						 is_udplite);
+				return -ret;
+			}
+		}
+
+		/* FALLTHROUGH -- it's a UDP Packet */
+	}
+
+	/*
+	 * 	UDP-Lite specific tests, ignored on UDP sockets
+	 */
+	if ((is_udplite & UDPLITE_RECV_CC)  &&  UDP_SKB_CB(skb)->partial_cov) {
+
+		/*
+		 * MIB statistics other than incrementing the error count are
+		 * disabled for the following two types of errors: these depend
+		 * on the application settings, not on the functioning of the
+		 * protocol stack as such.
+		 *
+		 * RFC 3828 here recommends (sec 3.3): "There should also be a
+		 * way ... to ... at least let the receiving application block
+		 * delivery of packets with coverage values less than a value
+		 * provided by the application."
+		 */
+		if (up->pcrlen == 0) {          /* full coverage was set  */
+			LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
+				"%d while full coverage %d requested\n",
+				UDP_SKB_CB(skb)->cscov, skb->len);
+			goto drop;
+		}
+		/* The next case involves violating the min. coverage requested
+		 * by the receiver. This is subtle: if receiver wants x and x is
+		 * greater than the buffersize/MTU then receiver will complain
+		 * that it wants x while sender emits packets of smaller size y.
+		 * Therefore the above ...()->partial_cov statement is essential.
+		 */
+		if (UDP_SKB_CB(skb)->cscov  <  up->pcrlen) {
+			LIMIT_NETDEBUG(KERN_WARNING
+				"UDPLITE: coverage %d too small, need min %d\n",
+				UDP_SKB_CB(skb)->cscov, up->pcrlen);
+			goto drop;
+		}
+	}
+
+	if (sk->sk_filter) {
+		if (udp_lib_checksum_complete(skb))
+			goto drop;
+	}
+
+	if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
+		/* Note that an ENOMEM error is charged twice */
+		if (rc == -ENOMEM)
+			UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
+		goto drop;
+	}
+
+	return 0;
+
+drop:
+	UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
+	kfree_skb(skb);
+	return -1;
+}
+
+/*
+ *	Multicasts and broadcasts go to each listener.
+ *
+ *	Note: called only from the BH handler context,
+ *	so we don't need to lock the hashes.
+ */
+static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
+				    struct udphdr  *uh,
+				    __be32 saddr, __be32 daddr,
+				    struct hlist_head udptable[])
+{
+	struct sock *sk;
+	int dif;
+
+	read_lock(&udp_hash_lock);
+	sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
+	dif = skb->dev->ifindex;
+	sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
+	if (sk) {
+		struct sock *sknext = NULL;
+
+		do {
+			struct sk_buff *skb1 = skb;
+
+			sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
+						   uh->source, saddr, dif);
+			if (sknext)
+				skb1 = skb_clone(skb, GFP_ATOMIC);
+
+			if (skb1) {
+				int ret = 0;
+
+				bh_lock_sock_nested(sk);
+				if (!sock_owned_by_user(sk))
+					ret = udp_queue_rcv_skb(sk, skb1);
+				else
+					sk_add_backlog(sk, skb1);
+				bh_unlock_sock(sk);
+
+				if (ret > 0)
+					/* we should probably re-process instead
+					 * of dropping packets here. */
+					kfree_skb(skb1);
+			}
+			sk = sknext;
+		} while (sknext);
+	} else
+		kfree_skb(skb);
+	read_unlock(&udp_hash_lock);
+	return 0;
+}
+
+/* Initialize UDP checksum. If exited with zero value (success),
+ * CHECKSUM_UNNECESSARY means, that no more checks are required.
+ * Otherwise, csum completion requires chacksumming packet body,
+ * including udp header and folding it to skb->csum.
+ */
+static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
+				 int proto)
+{
+	const struct iphdr *iph;
+	int err;
+
+	UDP_SKB_CB(skb)->partial_cov = 0;
+	UDP_SKB_CB(skb)->cscov = skb->len;
+
+	if (IS_PROTO_UDPLITE(proto)) {
+		err = udplite_checksum_init(skb, uh);
+		if (err)
+			return err;
+	}
+
+	iph = ip_hdr(skb);
+	if (uh->check == 0) {
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+	} else if (skb->ip_summed == CHECKSUM_COMPLETE) {
+	       if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
+				      proto, skb->csum))
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+	if (!skb_csum_unnecessary(skb))
+		skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
+					       skb->len, proto, 0);
+	/* Probably, we should checksum udp header (it should be in cache
+	 * in any case) and data in tiny packets (< rx copybreak).
+	 */
+
+	return 0;
+}
+
+/*
+ *	All we need to do is get the socket, and then do a checksum.
+ */
+
+int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
+		   int proto)
+{
+	struct sock *sk;
+	struct udphdr *uh = udp_hdr(skb);
+	unsigned short ulen;
+	struct rtable *rt = (struct rtable*)skb->dst;
+	__be32 saddr = ip_hdr(skb)->saddr;
+	__be32 daddr = ip_hdr(skb)->daddr;
+
+	/*
+	 *  Validate the packet.
+	 */
+	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+		goto drop;		/* No space for header. */
+
+	ulen = ntohs(uh->len);
+	if (ulen > skb->len)
+		goto short_packet;
+
+	if (IS_PROTO_UDPLITE(proto)) {
+		/* UDP validates ulen. */
+		if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
+			goto short_packet;
+		uh = udp_hdr(skb);
+	}
+
+	if (udp4_csum_init(skb, uh, proto))
+		goto csum_error;
+
+	if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
+		return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
+
+	sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
+			uh->dest, inet_iif(skb), udptable);
+
+	if (sk != NULL) {
+		int ret = 0;
+		bh_lock_sock_nested(sk);
+		if (!sock_owned_by_user(sk))
+			ret = udp_queue_rcv_skb(sk, skb);
+		else
+			sk_add_backlog(sk, skb);
+		bh_unlock_sock(sk);
+		sock_put(sk);
+
+		/* a return value > 0 means to resubmit the input, but
+		 * it wants the return to be -protocol, or 0
+		 */
+		if (ret > 0)
+			return -ret;
+		return 0;
+	}
+
+	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
+		goto drop;
+	nf_reset(skb);
+
+	/* No socket. Drop packet silently, if checksum is wrong */
+	if (udp_lib_checksum_complete(skb))
+		goto csum_error;
+
+	UDP_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
+	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+	/*
+	 * Hmm.  We got an UDP packet to a port to which we
+	 * don't wanna listen.  Ignore it.
+	 */
+	kfree_skb(skb);
+	return 0;
+
+short_packet:
+	LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
+		       IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
+		       NIPQUAD(saddr),
+		       ntohs(uh->source),
+		       ulen,
+		       skb->len,
+		       NIPQUAD(daddr),
+		       ntohs(uh->dest));
+	goto drop;
+
+csum_error:
+	/*
+	 * RFC1122: OK.  Discards the bad packet silently (as far as
+	 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
+	 */
+	LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
+		       IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
+		       NIPQUAD(saddr),
+		       ntohs(uh->source),
+		       NIPQUAD(daddr),
+		       ntohs(uh->dest),
+		       ulen);
+drop:
+	UDP_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
+	kfree_skb(skb);
+	return 0;
+}
+
+int udp_rcv(struct sk_buff *skb)
+{
+	return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
+}
+
+int udp_destroy_sock(struct sock *sk)
+{
+	lock_sock(sk);
+	udp_flush_pending_frames(sk);
+	release_sock(sk);
+	return 0;
+}
+
+int udp_setsockopt(struct sock *sk, int level, int optname,
+		   char __user *optval, int optlen)
+{
+	if (IS_SOL_UDPFAMILY(level))
+		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+					  udp_push_pending_frames);
+	return ip_setsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_udp_setsockopt(struct sock *sk, int level, int optname,
+			  char __user *optval, int optlen)
+{
+	if (IS_SOL_UDPFAMILY(level))
+		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+					  udp_push_pending_frames);
+	return compat_ip_setsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+int udp_getsockopt(struct sock *sk, int level, int optname,
+		   char __user *optval, int __user *optlen)
+{
+	if (IS_SOL_UDPFAMILY(level))
+		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
+	return ip_getsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_udp_getsockopt(struct sock *sk, int level, int optname,
+			  char __user *optval, int __user *optlen)
+{
+	if (IS_SOL_UDPFAMILY(level))
+		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
+	return compat_ip_getsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+/* ------------------------------------------------------------------------ */
+DEFINE_PROTO_INUSE(udp)
+
+struct proto udp_prot = {
+	.name		   = "UDP",
+	.owner		   = THIS_MODULE,
+	.close		   = udp_lib_close,
+	.connect	   = ip4_datagram_connect,
+	.disconnect	   = udp_disconnect,
+	.ioctl		   = udp_ioctl,
+	.destroy	   = udp_destroy_sock,
+	.setsockopt	   = udp_setsockopt,
+	.getsockopt	   = udp_getsockopt,
+	.sendmsg	   = udp_sendmsg,
+	.recvmsg	   = udp_recvmsg,
+	.sendpage	   = udp_sendpage,
+	.backlog_rcv	   = udp_queue_rcv_skb,
+	.hash		   = udp_lib_hash,
+	.unhash		   = udp_lib_unhash,
+	.get_port	   = udp_v4_get_port,
+	.memory_allocated  = &udp_memory_allocated,
+	.sysctl_mem	   = sysctl_udp_mem,
+	.sysctl_wmem	   = &sysctl_udp_wmem_min,
+	.sysctl_rmem	   = &sysctl_udp_rmem_min,
+	.obj_size	   = sizeof(struct udp_sock),
+#ifdef CONFIG_COMPAT
+	.compat_setsockopt = compat_udp_setsockopt,
+	.compat_getsockopt = compat_udp_getsockopt,
+#endif
+	REF_PROTO_INUSE(udp)
+};
+
+/* ------------------------------------------------------------------------ */
+static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
+{
+	struct inet_sock *inet = inet_sk(sp);
+	__be32 dest = inet->daddr;
+	__be32 src  = inet->rcv_saddr;
+	__u16 destp	  = ntohs(inet->dport);
+	__u16 srcp	  = ntohs(inet->sport);
+
+	sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
+		" %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
+		bucket, 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);
+}
+
+int udp4_seq_show(struct seq_file *seq, void *v)
+{
+	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 {
+		char tmpbuf[129];
+		struct udp_iter_state *state = seq->private;
+
+		udp4_format_sock(v, tmpbuf, state->bucket);
+		seq_printf(seq, "%-127s\n", tmpbuf);
+	}
+	return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+#ifdef CONFIG_PROC_FS
+static struct file_operations udp4_seq_fops;
+static struct udp_seq_afinfo udp4_seq_afinfo = {
+	.owner		= THIS_MODULE,
+	.name		= "udp",
+	.family		= AF_INET,
+	.hashtable	= udp_hash,
+	.seq_show	= udp4_seq_show,
+	.seq_fops	= &udp4_seq_fops,
+};
+
+int __init udp4_proc_init(void)
+{
+	return udp_proc_register(&udp4_seq_afinfo);
+}
+
+void udp4_proc_exit(void)
+{
+	udp_proc_unregister(&udp4_seq_afinfo);
+}
+#endif /* CONFIG_PROC_FS */
+
+EXPORT_SYMBOL(udp_prot);
+EXPORT_SYMBOL(udp_sendmsg);
+
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite_ipv4.c
index 001b881..001b881 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite_ipv4.c