Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1075 insertions, 0 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
new file mode 100644
index 0000000..e251d0b
--- /dev/null
+++ b/net/ipv6/udp.c
@@ -0,0 +1,1075 @@
+/*
+ *	UDP over IPv6
+ *	Linux INET6 implementation 
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>	
+ *
+ *	Based on linux/ipv4/udp.c
+ *
+ *	$Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
+ *
+ *	Fixes:
+ *	Hideaki YOSHIFUJI	:	sin6_scope_id support
+ *	YOSHIFUJI Hideaki @USAGI and:	Support IPV6_V6ONLY socket option, which
+ *	Alexey Kuznetsov		allow both IPv4 and IPv6 sockets to bind
+ *					a single port at the same time.
+ *      Kazunori MIYAZAWA @USAGI:       change process style to use ip6_append_data
+ *      YOSHIFUJI Hideaki @USAGI:	convert /proc/net/udp6 to seq_file.
+ *
+ *	This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/sched.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/raw.h>
+#include <net/inet_common.h>
+
+#include <net/ip6_checksum.h>
+#include <net/xfrm.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6);
+
+/* Grrr, addr_type already calculated by caller, but I don't want
+ * to add some silly "cookie" argument to this method just for that.
+ */
+static int udp_v6_get_port(struct sock *sk, unsigned short snum)
+{
+	struct sock *sk2;
+	struct hlist_node *node;
+
+	write_lock_bh(&udp_hash_lock);
+	if (snum == 0) {
+		int best_size_so_far, best, result, i;
+
+		if (udp_port_rover > sysctl_local_port_range[1] ||
+		    udp_port_rover < sysctl_local_port_range[0])
+			udp_port_rover = sysctl_local_port_range[0];
+		best_size_so_far = 32767;
+		best = result = udp_port_rover;
+		for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
+			int size;
+			struct hlist_head *list;
+
+			list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
+			if (hlist_empty(list)) {
+				if (result > sysctl_local_port_range[1])
+					result = sysctl_local_port_range[0] +
+						((result - sysctl_local_port_range[0]) &
+						 (UDP_HTABLE_SIZE - 1));
+				goto gotit;
+			}
+			size = 0;
+			sk_for_each(sk2, node, list)
+				if (++size >= best_size_so_far)
+					goto next;
+			best_size_so_far = size;
+			best = result;
+		next:;
+		}
+		result = best;
+		for(;; result += UDP_HTABLE_SIZE) {
+			if (result > sysctl_local_port_range[1])
+				result = sysctl_local_port_range[0]
+					+ ((result - sysctl_local_port_range[0]) &
+					   (UDP_HTABLE_SIZE - 1));
+			if (!udp_lport_inuse(result))
+				break;
+		}
+gotit:
+		udp_port_rover = snum = result;
+	} else {
+		sk_for_each(sk2, node,
+			    &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
+			if (inet_sk(sk2)->num == snum &&
+			    sk2 != sk &&
+			    (!sk2->sk_bound_dev_if ||
+			     !sk->sk_bound_dev_if ||
+			     sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
+			    (!sk2->sk_reuse || !sk->sk_reuse) &&
+			    ipv6_rcv_saddr_equal(sk, sk2))
+				goto fail;
+		}
+	}
+
+	inet_sk(sk)->num = snum;
+	if (sk_unhashed(sk)) {
+		sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
+		sock_prot_inc_use(sk->sk_prot);
+	}
+	write_unlock_bh(&udp_hash_lock);
+	return 0;
+
+fail:
+	write_unlock_bh(&udp_hash_lock);
+	return 1;
+}
+
+static void udp_v6_hash(struct sock *sk)
+{
+	BUG();
+}
+
+static void udp_v6_unhash(struct sock *sk)
+{
+ 	write_lock_bh(&udp_hash_lock);
+	if (sk_del_node_init(sk)) {
+		inet_sk(sk)->num = 0;
+		sock_prot_dec_use(sk->sk_prot);
+	}
+	write_unlock_bh(&udp_hash_lock);
+}
+
+static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
+				  struct in6_addr *daddr, u16 dport, int dif)
+{
+	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, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
+		struct inet_sock *inet = inet_sk(sk);
+
+		if (inet->num == hnum && sk->sk_family == PF_INET6) {
+			struct ipv6_pinfo *np = inet6_sk(sk);
+			int score = 0;
+			if (inet->dport) {
+				if (inet->dport != sport)
+					continue;
+				score++;
+			}
+			if (!ipv6_addr_any(&np->rcv_saddr)) {
+				if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
+					continue;
+				score++;
+			}
+			if (!ipv6_addr_any(&np->daddr)) {
+				if (!ipv6_addr_equal(&np->daddr, saddr))
+					continue;
+				score++;
+			}
+			if (sk->sk_bound_dev_if) {
+				if (sk->sk_bound_dev_if != dif)
+					continue;
+				score++;
+			}
+			if(score == 4) {
+				result = sk;
+				break;
+			} else if(score > badness) {
+				result = sk;
+				badness = score;
+			}
+		}
+	}
+	if (result)
+		sock_hold(result);
+ 	read_unlock(&udp_hash_lock);
+	return result;
+}
+
+/*
+ *
+ */
+
+static void udpv6_close(struct sock *sk, long timeout)
+{
+	sk_common_release(sk);
+}
+
+/*
+ * 	This should be easy, if there is something there we
+ * 	return it, otherwise we block.
+ */
+
+static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 
+		  struct msghdr *msg, size_t len,
+		  int noblock, int flags, int *addr_len)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct inet_sock *inet = inet_sk(sk);
+  	struct sk_buff *skb;
+	size_t copied;
+  	int err;
+
+  	if (addr_len)
+  		*addr_len=sizeof(struct sockaddr_in6);
+  
+	if (flags & MSG_ERRQUEUE)
+		return ipv6_recv_error(sk, msg, len);
+
+try_again:
+	skb = skb_recv_datagram(sk, flags, noblock, &err);
+	if (!skb)
+		goto out;
+
+ 	copied = skb->len - sizeof(struct udphdr);
+  	if (copied > len) {
+  		copied = len;
+  		msg->msg_flags |= MSG_TRUNC;
+  	}
+
+	if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
+		err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
+					      copied);
+	} else if (msg->msg_flags&MSG_TRUNC) {
+		if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
+			goto csum_copy_err;
+		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;
+
+	sock_recv_timestamp(msg, sk, skb);
+
+	/* Copy the address. */
+	if (msg->msg_name) {
+		struct sockaddr_in6 *sin6;
+	  
+		sin6 = (struct sockaddr_in6 *) msg->msg_name;
+		sin6->sin6_family = AF_INET6;
+		sin6->sin6_port = skb->h.uh->source;
+		sin6->sin6_flowinfo = 0;
+		sin6->sin6_scope_id = 0;
+
+		if (skb->protocol == htons(ETH_P_IP))
+			ipv6_addr_set(&sin6->sin6_addr, 0, 0,
+				      htonl(0xffff), skb->nh.iph->saddr);
+		else {
+			ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
+			if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+				sin6->sin6_scope_id = IP6CB(skb)->iif;
+		}
+
+	}
+	if (skb->protocol == htons(ETH_P_IP)) {
+		if (inet->cmsg_flags)
+			ip_cmsg_recv(msg, skb);
+	} else {
+		if (np->rxopt.all)
+			datagram_recv_ctl(sk, msg, skb);
+  	}
+
+	err = copied;
+	if (flags & MSG_TRUNC)
+		err = skb->len - sizeof(struct udphdr);
+
+out_free:
+	skb_free_datagram(sk, skb);
+out:
+	return err;
+
+csum_copy_err:
+	/* Clear queue. */
+	if (flags&MSG_PEEK) {
+		int clear = 0;
+		spin_lock_irq(&sk->sk_receive_queue.lock);
+		if (skb == skb_peek(&sk->sk_receive_queue)) {
+			__skb_unlink(skb, &sk->sk_receive_queue);
+			clear = 1;
+		}
+		spin_unlock_irq(&sk->sk_receive_queue.lock);
+		if (clear)
+			kfree_skb(skb);
+	}
+
+	skb_free_datagram(sk, skb);
+
+	if (flags & MSG_DONTWAIT) {
+		UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
+		return -EAGAIN;
+	}
+	goto try_again;
+}
+
+static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+	       int type, int code, int offset, __u32 info)
+{
+	struct ipv6_pinfo *np;
+	struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
+	struct net_device *dev = skb->dev;
+	struct in6_addr *saddr = &hdr->saddr;
+	struct in6_addr *daddr = &hdr->daddr;
+	struct udphdr *uh = (struct udphdr*)(skb->data+offset);
+	struct sock *sk;
+	int err;
+
+	sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
+   
+	if (sk == NULL)
+		return;
+
+	np = inet6_sk(sk);
+
+	if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
+		goto out;
+
+	if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
+		goto out;
+
+	if (np->recverr)
+		ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
+
+	sk->sk_err = err;
+	sk->sk_error_report(sk);
+out:
+	sock_put(sk);
+}
+
+static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
+{
+	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
+		kfree_skb(skb);
+		return -1;
+	}
+
+	if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
+		if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
+			UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
+			kfree_skb(skb);
+			return 0;
+		}
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+
+	if (sock_queue_rcv_skb(sk,skb)<0) {
+		UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
+		kfree_skb(skb);
+		return 0;
+	}
+	UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
+	return 0;
+}
+
+static struct sock *udp_v6_mcast_next(struct sock *sk,
+				      u16 loc_port, struct in6_addr *loc_addr,
+				      u16 rmt_port, struct in6_addr *rmt_addr,
+				      int dif)
+{
+	struct hlist_node *node;
+	struct sock *s = sk;
+	unsigned short num = ntohs(loc_port);
+
+	sk_for_each_from(s, node) {
+		struct inet_sock *inet = inet_sk(s);
+
+		if (inet->num == num && s->sk_family == PF_INET6) {
+			struct ipv6_pinfo *np = inet6_sk(s);
+			if (inet->dport) {
+				if (inet->dport != rmt_port)
+					continue;
+			}
+			if (!ipv6_addr_any(&np->daddr) &&
+			    !ipv6_addr_equal(&np->daddr, rmt_addr))
+				continue;
+
+			if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
+				continue;
+
+			if (!ipv6_addr_any(&np->rcv_saddr)) {
+				if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
+					return s;
+				continue;
+			}
+			if(!inet6_mc_check(s, loc_addr, rmt_addr))
+				continue;
+			return s;
+		}
+	}
+	return NULL;
+}
+
+/*
+ * Note: called only from the BH handler context,
+ * so we don't need to lock the hashes.
+ */
+static void udpv6_mcast_deliver(struct udphdr *uh,
+				struct in6_addr *saddr, struct in6_addr *daddr,
+				struct sk_buff *skb)
+{
+	struct sock *sk, *sk2;
+	int dif;
+
+	read_lock(&udp_hash_lock);
+	sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
+	dif = skb->dev->ifindex;
+	sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
+	if (!sk) {
+		kfree_skb(skb);
+		goto out;
+	}
+
+	sk2 = sk;
+	while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
+					uh->source, saddr, dif))) {
+		struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
+		if (buff)
+			udpv6_queue_rcv_skb(sk2, buff);
+	}
+	udpv6_queue_rcv_skb(sk, skb);
+out:
+	read_unlock(&udp_hash_lock);
+}
+
+static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
+{
+	struct sk_buff *skb = *pskb;
+	struct sock *sk;
+  	struct udphdr *uh;
+	struct net_device *dev = skb->dev;
+	struct in6_addr *saddr, *daddr;
+	u32 ulen = 0;
+
+	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+		goto short_packet;
+
+	saddr = &skb->nh.ipv6h->saddr;
+	daddr = &skb->nh.ipv6h->daddr;
+	uh = skb->h.uh;
+
+	ulen = ntohs(uh->len);
+
+	/* Check for jumbo payload */
+	if (ulen == 0)
+		ulen = skb->len;
+
+	if (ulen > skb->len || ulen < sizeof(*uh))
+		goto short_packet;
+
+	if (uh->check == 0) {
+		/* RFC 2460 section 8.1 says that we SHOULD log
+		   this error. Well, it is reasonable.
+		 */
+		LIMIT_NETDEBUG(
+			printk(KERN_INFO "IPv6: udp checksum is 0\n"));
+		goto discard;
+	}
+
+	if (ulen < skb->len) {
+		if (__pskb_trim(skb, ulen))
+			goto discard;
+		saddr = &skb->nh.ipv6h->saddr;
+		daddr = &skb->nh.ipv6h->daddr;
+		uh = skb->h.uh;
+	}
+
+	if (skb->ip_summed==CHECKSUM_HW) {
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+		if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
+			LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
+			skb->ip_summed = CHECKSUM_NONE;
+		}
+	}
+	if (skb->ip_summed != CHECKSUM_UNNECESSARY)
+		skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
+
+	/* 
+	 *	Multicast receive code 
+	 */
+	if (ipv6_addr_is_multicast(daddr)) {
+		udpv6_mcast_deliver(uh, saddr, daddr, skb);
+		return 0;
+	}
+
+	/* Unicast */
+
+	/* 
+	 * check socket cache ... must talk to Alan about his plans
+	 * for sock caches... i'll skip this for now.
+	 */
+	sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
+
+	if (sk == NULL) {
+		if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
+			goto discard;
+
+		if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
+		    (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
+			goto discard;
+		UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
+
+		icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
+
+		kfree_skb(skb);
+		return(0);
+	}
+	
+	/* deliver */
+	
+	udpv6_queue_rcv_skb(sk, skb);
+	sock_put(sk);
+	return(0);
+
+short_packet:	
+	if (net_ratelimit())
+		printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
+
+discard:
+	UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
+	kfree_skb(skb);
+	return(0);	
+}
+/*
+ * Throw away all pending data and cancel the corking. Socket is locked.
+ */
+static void udp_v6_flush_pending_frames(struct sock *sk)
+{
+	struct udp_sock *up = udp_sk(sk);
+
+	if (up->pending) {
+		up->len = 0;
+		up->pending = 0;
+		ip6_flush_pending_frames(sk);
+        }
+}
+
+/*
+ *	Sending
+ */
+
+static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
+{
+	struct sk_buff *skb;
+	struct udphdr *uh;
+	struct inet_sock *inet = inet_sk(sk);
+	struct flowi *fl = &inet->cork.fl;
+	int err = 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 = skb->h.uh;
+	uh->source = fl->fl_ip_sport;
+	uh->dest = fl->fl_ip_dport;
+	uh->len = htons(up->len);
+	uh->check = 0;
+
+	if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
+		skb->ip_summed = CHECKSUM_NONE;
+		goto send;
+	}
+
+	if (skb_queue_len(&sk->sk_write_queue) == 1) {
+		skb->csum = csum_partial((char *)uh,
+				sizeof(struct udphdr), skb->csum);
+		uh->check = csum_ipv6_magic(&fl->fl6_src,
+					    &fl->fl6_dst,
+					    up->len, fl->proto, skb->csum);
+	} else {
+		u32 tmp_csum = 0;
+
+		skb_queue_walk(&sk->sk_write_queue, skb) {
+			tmp_csum = csum_add(tmp_csum, skb->csum);
+		}
+		tmp_csum = csum_partial((char *)uh,
+				sizeof(struct udphdr), tmp_csum);
+                tmp_csum = csum_ipv6_magic(&fl->fl6_src,
+					   &fl->fl6_dst,
+					   up->len, fl->proto, tmp_csum);
+                uh->check = tmp_csum;
+
+	}
+	if (uh->check == 0)
+		uh->check = -1;
+
+send:
+	err = ip6_push_pending_frames(sk);
+out:
+	up->len = 0;
+	up->pending = 0;
+	return err;
+}
+
+static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 
+		  struct msghdr *msg, size_t len)
+{
+	struct ipv6_txoptions opt_space;
+	struct udp_sock *up = udp_sk(sk);
+	struct inet_sock *inet = inet_sk(sk);
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
+	struct in6_addr *daddr, *final_p = NULL, final;
+	struct ipv6_txoptions *opt = NULL;
+	struct ip6_flowlabel *flowlabel = NULL;
+	struct flowi *fl = &inet->cork.fl;
+	struct dst_entry *dst;
+	int addr_len = msg->msg_namelen;
+	int ulen = len;
+	int hlimit = -1;
+	int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
+	int err;
+
+	/* destination address check */
+	if (sin6) {
+		if (addr_len < offsetof(struct sockaddr, sa_data))
+			return -EINVAL;
+
+		switch (sin6->sin6_family) {
+		case AF_INET6:
+			if (addr_len < SIN6_LEN_RFC2133)
+				return -EINVAL;
+			daddr = &sin6->sin6_addr;
+			break;
+		case AF_INET:
+			goto do_udp_sendmsg;
+		case AF_UNSPEC:
+			msg->msg_name = sin6 = NULL;
+			msg->msg_namelen = addr_len = 0;
+			daddr = NULL;
+			break;
+		default:
+			return -EINVAL;
+		}
+	} else if (!up->pending) {
+		if (sk->sk_state != TCP_ESTABLISHED)
+			return -EDESTADDRREQ;
+		daddr = &np->daddr;
+	} else 
+		daddr = NULL;
+
+	if (daddr) {
+		if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
+			struct sockaddr_in sin;
+			sin.sin_family = AF_INET;
+			sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
+			sin.sin_addr.s_addr = daddr->s6_addr32[3];
+			msg->msg_name = &sin;
+			msg->msg_namelen = sizeof(sin);
+do_udp_sendmsg:
+			if (__ipv6_only_sock(sk))
+				return -ENETUNREACH;
+			return udp_sendmsg(iocb, sk, msg, len);
+		}
+	}
+
+	if (up->pending == AF_INET)
+		return udp_sendmsg(iocb, sk, msg, len);
+
+	/* Rough check on arithmetic overflow,
+	   better check is made in ip6_build_xmit
+	   */
+	if (len > INT_MAX - sizeof(struct udphdr))
+		return -EMSGSIZE;
+	
+	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_INET6)) {
+				release_sock(sk);
+				return -EAFNOSUPPORT;
+			}
+			dst = NULL;
+			goto do_append_data;
+		}
+		release_sock(sk);
+	}
+	ulen += sizeof(struct udphdr);
+
+	memset(fl, 0, sizeof(*fl));
+
+	if (sin6) {
+		if (sin6->sin6_port == 0)
+			return -EINVAL;
+
+		fl->fl_ip_dport = sin6->sin6_port;
+		daddr = &sin6->sin6_addr;
+
+		if (np->sndflow) {
+			fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
+			if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
+				flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
+				if (flowlabel == NULL)
+					return -EINVAL;
+				daddr = &flowlabel->dst;
+			}
+		}
+
+		/*
+		 * Otherwise it will be difficult to maintain
+		 * sk->sk_dst_cache.
+		 */
+		if (sk->sk_state == TCP_ESTABLISHED &&
+		    ipv6_addr_equal(daddr, &np->daddr))
+			daddr = &np->daddr;
+
+		if (addr_len >= sizeof(struct sockaddr_in6) &&
+		    sin6->sin6_scope_id &&
+		    ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
+			fl->oif = sin6->sin6_scope_id;
+	} else {
+		if (sk->sk_state != TCP_ESTABLISHED)
+			return -EDESTADDRREQ;
+
+		fl->fl_ip_dport = inet->dport;
+		daddr = &np->daddr;
+		fl->fl6_flowlabel = np->flow_label;
+	}
+
+	if (!fl->oif)
+		fl->oif = sk->sk_bound_dev_if;
+
+	if (msg->msg_controllen) {
+		opt = &opt_space;
+		memset(opt, 0, sizeof(struct ipv6_txoptions));
+		opt->tot_len = sizeof(*opt);
+
+		err = datagram_send_ctl(msg, fl, opt, &hlimit);
+		if (err < 0) {
+			fl6_sock_release(flowlabel);
+			return err;
+		}
+		if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
+			flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
+			if (flowlabel == NULL)
+				return -EINVAL;
+		}
+		if (!(opt->opt_nflen|opt->opt_flen))
+			opt = NULL;
+	}
+	if (opt == NULL)
+		opt = np->opt;
+	if (flowlabel)
+		opt = fl6_merge_options(&opt_space, flowlabel, opt);
+
+	fl->proto = IPPROTO_UDP;
+	ipv6_addr_copy(&fl->fl6_dst, daddr);
+	if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
+		ipv6_addr_copy(&fl->fl6_src, &np->saddr);
+	fl->fl_ip_sport = inet->sport;
+	
+	/* merge ip6_build_xmit from ip6_output */
+	if (opt && opt->srcrt) {
+		struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
+		ipv6_addr_copy(&final, &fl->fl6_dst);
+		ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
+		final_p = &final;
+	}
+
+	if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
+		fl->oif = np->mcast_oif;
+
+	err = ip6_dst_lookup(sk, &dst, fl);
+	if (err)
+		goto out;
+	if (final_p)
+		ipv6_addr_copy(&fl->fl6_dst, final_p);
+
+	if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) {
+		dst_release(dst);
+		goto out;
+	}
+
+	if (hlimit < 0) {
+		if (ipv6_addr_is_multicast(&fl->fl6_dst))
+			hlimit = np->mcast_hops;
+		else
+			hlimit = np->hop_limit;
+		if (hlimit < 0)
+			hlimit = dst_metric(dst, RTAX_HOPLIMIT);
+		if (hlimit < 0)
+			hlimit = ipv6_get_hoplimit(dst->dev);
+	}
+
+	if (msg->msg_flags&MSG_CONFIRM)
+		goto do_confirm;
+back_from_confirm:
+
+	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(printk(KERN_DEBUG "udp cork app bug 2\n"));
+		err = -EINVAL;
+		goto out;
+	}
+
+	up->pending = AF_INET6;
+
+do_append_data:
+	up->len += ulen;
+	err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
+			      hlimit, opt, fl, (struct rt6_info*)dst,
+			      corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
+	if (err)
+		udp_v6_flush_pending_frames(sk);
+	else if (!corkreq)
+		err = udp_v6_push_pending_frames(sk, up);
+
+	if (dst)
+		ip6_dst_store(sk, dst,
+			      ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
+			      &np->daddr : NULL);
+	if (err > 0)
+		err = np->recverr ? net_xmit_errno(err) : 0;
+	release_sock(sk);
+out:
+	fl6_sock_release(flowlabel);
+	if (!err) {
+		UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
+		return len;
+	}
+	return err;
+
+do_confirm:
+	dst_confirm(dst);
+	if (!(msg->msg_flags&MSG_PROBE) || len)
+		goto back_from_confirm;
+	err = 0;
+	goto out;
+}
+
+static int udpv6_destroy_sock(struct sock *sk)
+{
+	lock_sock(sk);
+	udp_v6_flush_pending_frames(sk);
+	release_sock(sk);
+
+	inet6_destroy_sock(sk);
+
+	return 0;
+}
+
+/*
+ *	Socket option code for UDP
+ */
+static int udpv6_setsockopt(struct sock *sk, int level, int optname, 
+			  char __user *optval, int optlen)
+{
+	struct udp_sock *up = udp_sk(sk);
+	int val;
+	int err = 0;
+
+	if (level != SOL_UDP)
+		return ipv6_setsockopt(sk, level, optname, optval, optlen);
+
+	if(optlen<sizeof(int))
+		return -EINVAL;
+
+	if (get_user(val, (int __user *)optval))
+		return -EFAULT;
+
+	switch(optname) {
+	case UDP_CORK:
+		if (val != 0) {
+			up->corkflag = 1;
+		} else {
+			up->corkflag = 0;
+			lock_sock(sk);
+			udp_v6_push_pending_frames(sk, up);
+			release_sock(sk);
+		}
+		break;
+		
+	case UDP_ENCAP:
+		switch (val) {
+		case 0:
+			up->encap_type = val;
+			break;
+		default:
+			err = -ENOPROTOOPT;
+			break;
+		}
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	};
+
+	return err;
+}
+
+static int udpv6_getsockopt(struct sock *sk, int level, int optname, 
+			  char __user *optval, int __user *optlen)
+{
+	struct udp_sock *up = udp_sk(sk);
+	int val, len;
+
+	if (level != SOL_UDP)
+		return ipv6_getsockopt(sk, level, optname, optval, optlen);
+
+	if(get_user(len,optlen))
+		return -EFAULT;
+
+	len = min_t(unsigned int, len, sizeof(int));
+	
+	if(len < 0)
+		return -EINVAL;
+
+	switch(optname) {
+	case UDP_CORK:
+		val = up->corkflag;
+		break;
+
+	case UDP_ENCAP:
+		val = up->encap_type;
+		break;
+
+	default:
+		return -ENOPROTOOPT;
+	};
+
+  	if(put_user(len, optlen))
+  		return -EFAULT;
+	if(copy_to_user(optval, &val,len))
+		return -EFAULT;
+  	return 0;
+}
+
+static struct inet6_protocol udpv6_protocol = {
+	.handler	=	udpv6_rcv,
+	.err_handler	=	udpv6_err,
+	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+/* ------------------------------------------------------------------------ */
+#ifdef CONFIG_PROC_FS
+
+static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
+{
+	struct inet_sock *inet = inet_sk(sp);
+	struct ipv6_pinfo *np = inet6_sk(sp);
+	struct in6_addr *dest, *src;
+	__u16 destp, srcp;
+
+	dest  = &np->daddr;
+	src   = &np->rcv_saddr;
+	destp = ntohs(inet->dport);
+	srcp  = ntohs(inet->sport);
+	seq_printf(seq,
+		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
+		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
+		   bucket,
+		   src->s6_addr32[0], src->s6_addr32[1],
+		   src->s6_addr32[2], src->s6_addr32[3], srcp,
+		   dest->s6_addr32[0], dest->s6_addr32[1],
+		   dest->s6_addr32[2], dest->s6_addr32[3], 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);
+}
+
+static int udp6_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == SEQ_START_TOKEN)
+		seq_printf(seq,
+			   "  sl  "
+			   "local_address                         "
+			   "remote_address                        "
+			   "st tx_queue rx_queue tr tm->when retrnsmt"
+			   "   uid  timeout inode\n");
+	else
+		udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
+	return 0;
+}
+
+static struct file_operations udp6_seq_fops;
+static struct udp_seq_afinfo udp6_seq_afinfo = {
+	.owner		= THIS_MODULE,
+	.name		= "udp6",
+	.family		= AF_INET6,
+	.seq_show	= udp6_seq_show,
+	.seq_fops	= &udp6_seq_fops,
+};
+
+int __init udp6_proc_init(void)
+{
+	return udp_proc_register(&udp6_seq_afinfo);
+}
+
+void udp6_proc_exit(void) {
+	udp_proc_unregister(&udp6_seq_afinfo);
+}
+#endif /* CONFIG_PROC_FS */
+
+/* ------------------------------------------------------------------------ */
+
+struct proto udpv6_prot = {
+	.name =		"UDPv6",
+	.owner =	THIS_MODULE,
+	.close =	udpv6_close,
+	.connect =	ip6_datagram_connect,
+	.disconnect =	udp_disconnect,
+	.ioctl =	udp_ioctl,
+	.destroy =	udpv6_destroy_sock,
+	.setsockopt =	udpv6_setsockopt,
+	.getsockopt =	udpv6_getsockopt,
+	.sendmsg =	udpv6_sendmsg,
+	.recvmsg =	udpv6_recvmsg,
+	.backlog_rcv =	udpv6_queue_rcv_skb,
+	.hash =		udp_v6_hash,
+	.unhash =	udp_v6_unhash,
+	.get_port =	udp_v6_get_port,
+	.obj_size =	sizeof(struct udp6_sock),
+};
+
+extern struct proto_ops inet6_dgram_ops;
+
+static struct inet_protosw udpv6_protosw = {
+	.type =      SOCK_DGRAM,
+	.protocol =  IPPROTO_UDP,
+	.prot =      &udpv6_prot,
+	.ops =       &inet6_dgram_ops,
+	.capability =-1,
+	.no_check =  UDP_CSUM_DEFAULT,
+	.flags =     INET_PROTOSW_PERMANENT,
+};
+
+
+void __init udpv6_init(void)
+{
+	if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
+		printk(KERN_ERR "udpv6_init: Could not register protocol\n");
+	inet6_register_protosw(&udpv6_protosw);
+}