patch-2.1.8 linux/net/ipv6/udp.c

• Lines: 624
• Date: Sun Nov 3 11:04:46 1996
• Orig file: v2.1.7/linux/net/ipv6/udp.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.7/linux/net/ipv6/udp.c linux/net/ipv6/udp.c
@@ -0,0 +1,623 @@
+/*
+ *	UDP over IPv6
+ *	Linux INET6 implementation 
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>	
+ *
+ *	Based on linux/ipv4/udp.c
+ *
+ *	$Id: udp.c,v 1.6 1996/10/16 18:34:16 roque Exp $
+ *
+ *	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/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 <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/ipv6_route.h>
+#include <net/addrconf.h>
+#include <net/ip.h>
+#include <net/udp.h>
+
+#include <net/checksum.h>
+
+struct udp_mib udp_stats_in6;
+
+/*
+ *
+ */
+
+int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+	struct sockaddr_in6	*usin = (struct sockaddr_in6 *) uaddr;
+	struct in6_addr		*daddr;
+	struct dest_entry	*dest;
+	struct ipv6_pinfo      	*np;
+	struct inet6_ifaddr	*ifa;
+	int			addr_type;
+
+	if (addr_len < sizeof(*usin)) 
+	  	return(-EINVAL);
+
+	if (usin->sin6_family && usin->sin6_family != AF_INET6) 
+	  	return(-EAFNOSUPPORT);
+
+	addr_type = ipv6_addr_type(&usin->sin6_addr);
+	np = &sk->net_pinfo.af_inet6;
+
+	if (addr_type == IPV6_ADDR_ANY)
+	{
+		/*
+		 *	connect to self
+		 */
+		usin->sin6_addr.s6_addr[15] = 0x01;
+	}
+
+	daddr = &usin->sin6_addr;
+
+	if (addr_type == IPV6_ADDR_MAPPED)
+	{
+		struct sockaddr_in sin;
+		int err;
+
+		sin.sin_family = AF_INET;
+		sin.sin_addr.s_addr = daddr->s6_addr32[3];
+
+		err = udp_connect(sk, (struct sockaddr*) &sin, sizeof(sin));
+		
+		if (err < 0)
+		{
+			return err;
+		}
+		
+		ipv6_addr_copy(&np->daddr, daddr);
+		
+		if(ipv6_addr_any(&np->saddr))
+		{
+			ipv6_addr_set(&np->saddr, 0, 0, 
+				      __constant_htonl(0x0000ffff),
+				      sk->saddr);
+
+		}
+
+		if(ipv6_addr_any(&np->rcv_saddr))
+		{
+			ipv6_addr_set(&np->rcv_saddr, 0, 0, 
+				      __constant_htonl(0x0000ffff),
+				      sk->rcv_saddr);
+		}
+
+	}
+
+	ipv6_addr_copy(&np->daddr, daddr);
+
+	/*
+	 *	Check for a route to destination an obtain the
+	 *	destination cache for it.
+	 */
+
+	dest = ipv6_dst_route(daddr, NULL, sk->localroute ? RTI_GATEWAY : 0);
+
+	np->dest = dest;
+
+	if (dest == NULL)
+		return -ENETUNREACH;
+
+	/* get the source adddress used in the apropriate device */
+
+	ifa = ipv6_get_saddr((struct rt6_info *) dest, daddr);
+
+	if(ipv6_addr_any(&np->saddr))
+	{
+		ipv6_addr_copy(&np->saddr, &ifa->addr);
+	}
+
+	if(ipv6_addr_any(&np->rcv_saddr))
+	{
+		ipv6_addr_copy(&np->rcv_saddr, &ifa->addr);
+		sk->rcv_saddr = 0xffffffff;
+	}
+
+	sk->dummy_th.dest = usin->sin6_port;
+
+	sk->state = TCP_ESTABLISHED;
+
+	return(0);
+}
+
+static void udpv6_close(struct sock *sk, unsigned long timeout)
+{
+	struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
+
+	lock_sock(sk);
+	sk->state = TCP_CLOSE;
+
+	if (np->dest)
+	{
+		ipv6_dst_unlock(np->dest);
+	}
+
+	release_sock(sk);
+	destroy_sock(sk);
+}
+
+/*
+ * 	This should be easy, if there is something there we
+ * 	return it, otherwise we block.
+ */
+
+int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, int len,
+		  int noblock, int flags, int *addr_len)
+{
+  	int copied = 0;
+  	int truesize;
+  	struct sk_buff *skb;
+  	int er;
+  	
+
+	/*
+	 *	Check any passed addresses
+	 */
+	 
+  	if (addr_len) 
+  		*addr_len=sizeof(struct sockaddr_in6);
+  
+	/*
+	 *	From here the generic datagram does a lot of the work. Come
+	 *	the finished NET3, it will do _ALL_ the work!
+	 */
+	 	
+	skb = skb_recv_datagram(sk, flags, noblock, &er);
+	if(skb==NULL)
+  		return er;
+  
+  	truesize = skb->tail - skb->h.raw - sizeof(struct udphdr);
+  	copied = min(len, truesize);
+
+  	/*
+  	 *	FIXME : should use udp header size info value 
+  	 */
+  	 
+	skb_copy_datagram_iovec(skb,sizeof(struct udphdr),msg->msg_iov,copied);
+	sk->stamp=skb->stamp;
+
+	/* 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;
+
+		if (skb->protocol == __constant_htons(ETH_P_IP))
+		{
+			ipv6_addr_set(&sin6->sin6_addr, 0, 0,
+				      __constant_htonl(0xffff), skb->daddr);
+		}
+		else
+		{
+			memcpy(&sin6->sin6_addr, &skb->ipv6_hdr->saddr,
+			       sizeof(struct in6_addr));
+
+			if (msg->msg_control)
+			{
+				int err;
+
+				err = datagram_recv_ctl(sk, msg, skb);
+
+				if (err < 0)
+				{
+					copied = err;
+				}
+			}
+		}
+  	}
+	
+  	skb_free_datagram(sk, skb);
+  	return(copied);
+}
+
+void udpv6_err(int type, int code, unsigned char *buff, __u32 info,
+	       struct in6_addr *saddr, struct in6_addr *daddr,
+	       struct inet6_protocol *protocol)
+{
+	struct sock *sk;
+	struct udphdr *uh;
+	int err;
+	
+	uh = (struct udphdr *) buff;
+
+	sk = inet6_get_sock(&udpv6_prot, daddr, saddr, uh->source, uh->dest);
+   
+	if (sk == NULL)
+	{
+		printk(KERN_DEBUG "icmp for unkown sock\n");
+		return;
+	}
+
+	if (icmpv6_err_convert(type, code, &err))
+	{
+		if(sk->bsdism && sk->state!=TCP_ESTABLISHED)
+			return;
+		
+		sk->err = err;
+		sk->error_report(sk);
+	}
+	else
+		sk->err_soft = err;
+}
+
+static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
+{
+
+	if (sock_queue_rcv_skb(sk,skb)<0) {
+		udp_stats_in6.UdpInErrors++;
+		ipv6_statistics.Ip6InDiscards++;
+		ipv6_statistics.Ip6InDelivers--;
+		skb->sk = NULL;
+		kfree_skb(skb, FREE_WRITE);
+		return 0;
+	}
+	udp_stats_in6.UdpInDatagrams++;
+	return 0;
+}
+
+int udpv6_rcv(struct sk_buff *skb, struct device *dev,
+	      struct in6_addr *saddr, struct in6_addr *daddr,
+	      struct ipv6_options *opt, unsigned short len,
+	      int redo, struct inet6_protocol *protocol)
+{
+	struct sock *sk;
+  	struct udphdr *uh;
+	int ulen;
+
+	/*
+	 *	check if the address is ours...
+	 *	I believe that this is being done in IP layer
+	 */
+
+	uh = (struct udphdr *) skb->h.uh;
+  	
+  	ipv6_statistics.Ip6InDelivers++;
+
+	ulen = ntohs(uh->len);
+	
+	if (ulen > len || len < sizeof(*uh))
+	{
+		printk(KERN_DEBUG "UDP: short packet: %d/%d\n", ulen, len);
+		udp_stats_in6.UdpInErrors++;
+		kfree_skb(skb, FREE_READ);
+		return(0);
+	}
+
+	if (uh->check == 0)
+	{
+		printk(KERN_DEBUG "IPv6: udp checksum is 0\n");
+		goto discard;
+	}
+
+	switch (skb->ip_summed) {
+	case CHECKSUM_NONE:
+		skb->csum = csum_partial((char*)uh, len, 0);
+	case CHECKSUM_HW:
+		if (csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, skb->csum))
+		{
+			printk(KERN_DEBUG "IPv6: udp checksum error\n");
+			goto discard;
+		}
+	}
+	
+	len = ulen;
+
+	/* 
+	 *	Multicast receive code 
+	 */
+	if (ipv6_addr_type(daddr) & IPV6_ADDR_MULTICAST)
+	{
+		struct sock *sk2;
+		int lport;
+		
+		lport = ntohs(uh->dest);
+		sk = udpv6_prot.sock_array[lport & (SOCK_ARRAY_SIZE-1)];
+
+		sk = inet6_get_sock_mcast(sk, lport, uh->source,
+					  daddr, saddr);
+
+		if (sk)
+		{
+			sk2 = sk;
+			
+			while ((sk2 = inet6_get_sock_mcast(sk2->next, lport,
+							   uh->source,
+							   daddr, saddr)))
+			{
+				struct sk_buff *buff;
+
+				buff = skb_clone(skb, GFP_ATOMIC);
+
+				if (sock_queue_rcv_skb(sk, buff) < 0) 
+				{
+					buff->sk = NULL;
+					kfree_skb(buff, FREE_READ);
+				}
+			}
+		}
+		if (!sk || sock_queue_rcv_skb(sk, skb) < 0)
+		{
+			skb->sk = NULL;
+			kfree_skb(skb, FREE_READ);
+		}
+		return 0;
+	}
+
+	/* Unicast */
+	
+	/* 
+	 * check socket cache ... must talk to Alan about his plans
+	 * for sock caches... i'll skip this for now.
+	 */
+
+	sk = inet6_get_sock(&udpv6_prot, daddr, saddr, uh->dest, uh->source);
+
+	if (sk == NULL)
+	{
+		udp_stats_in6.UdpNoPorts++;
+
+		icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH,
+			    0, dev);
+		
+		kfree_skb(skb, FREE_READ);
+		return(0);
+	}
+
+	/* deliver */
+
+	if (sk->users)
+	{
+		__skb_queue_tail(&sk->back_log, skb);
+	}
+	else
+	{
+		udpv6_queue_rcv_skb(sk, skb);
+	}
+	
+	return(0);
+
+  discard:
+	udp_stats_in6.UdpInErrors++;
+	kfree_skb(skb, FREE_READ);
+	return(0);	
+}
+
+/*
+ *	Sending
+ */
+
+struct udpv6fakehdr 
+{
+	struct udphdr	uh;
+	struct iovec	*iov;
+	__u32		wcheck;
+	__u32		pl_len;
+	struct in6_addr *daddr;
+};
+
+/*
+ *	with checksum
+ */
+
+static void udpv6_getfrag(const void *data, struct in6_addr *addr,
+			  char *buff, unsigned int offset, unsigned int len)
+{
+	struct udpv6fakehdr *udh = (struct udpv6fakehdr *) data;
+	char *dst;
+	int final = 0;
+	int clen = len;
+
+	dst = buff;
+
+	if (offset)
+	{
+		offset -= sizeof(struct udphdr);
+	}
+	else
+	{
+		dst += sizeof(struct udphdr);
+		final = 1;
+		clen -= sizeof(struct udphdr);
+	}
+
+	udh->wcheck = csum_partial_copy_fromiovecend(dst, udh->iov, offset,
+						     clen, udh->wcheck);
+
+	if (final)
+	{
+		struct in6_addr *daddr;
+		
+		udh->wcheck = csum_partial((char *)udh, sizeof(struct udphdr),
+					   udh->wcheck);
+
+		if (udh->daddr)
+		{
+			daddr = udh->daddr;
+		}
+		else
+		{
+			/*
+			 *	use packet destination address
+			 *	this should improve cache locality
+			 */
+			daddr = addr + 1;
+		}
+		udh->uh.check = csum_ipv6_magic(addr, daddr,
+						udh->pl_len, IPPROTO_UDP,
+						udh->wcheck);
+		if (udh->uh.check == 0)
+			udh->uh.check = -1;
+
+		memcpy(buff, udh, sizeof(struct udphdr));
+	}
+}
+
+static int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, int ulen, 
+			 int noblock, int flags)
+{
+	
+	struct ipv6_options opt_space;
+	struct udpv6fakehdr udh;
+	struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
+	struct ipv6_options *opt = NULL;
+	struct device *dev = NULL;
+	int addr_len = msg->msg_namelen;
+	struct in6_addr *daddr;
+	struct in6_addr *saddr = NULL;
+	int len = ulen + sizeof(struct udphdr);
+	int addr_type;
+	int err;
+
+	
+	if (flags & ~MSG_DONTROUTE)
+		return(-EINVAL);
+
+	if (sin6)
+	{
+		if (addr_len < sizeof(*sin6))
+			return(-EINVAL);
+		
+		if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
+			return(-EINVAL);
+
+		if (sin6->sin6_port == 0)
+			return(-EINVAL);
+	       
+		udh.uh.dest = sin6->sin6_port;
+		daddr = &sin6->sin6_addr;
+
+		if (np->dest && ipv6_addr_cmp(daddr, &np->daddr))
+		{
+			ipv6_dst_unlock(np->dest);
+			np->dest = NULL;
+		}
+	}
+	else
+	{
+		if (sk->state != TCP_ESTABLISHED)
+			return(-EINVAL);
+		
+		udh.uh.dest = sk->dummy_th.dest;
+		daddr = &sk->net_pinfo.af_inet6.daddr;
+	}
+
+	addr_type = ipv6_addr_type(daddr);
+
+	if (addr_type == IPV6_ADDR_MAPPED)
+	{
+		struct sockaddr_in sin;
+		
+		sin.sin_family = AF_INET;
+		sin.sin_addr.s_addr = daddr->s6_addr32[3];
+
+		return udp_sendmsg(sk, msg, len, noblock, flags);
+	}
+
+	udh.daddr = NULL;
+	
+	if (msg->msg_control)
+	{
+		opt = &opt_space;
+		memset(opt, 0, sizeof(struct ipv6_options));
+
+		err = datagram_send_ctl(msg, &dev, &saddr, opt);
+		if (err < 0)
+		{
+			printk(KERN_DEBUG "invalid msg_control\n");
+			return err;
+		}
+		
+		if (opt->srcrt)
+		{			
+			udh.daddr = daddr;
+		}
+	}
+	
+	udh.uh.source = sk->dummy_th.source;
+	udh.uh.len = htons(ulen);
+	udh.uh.check = 0;
+	udh.iov = msg->msg_iov;
+	udh.wcheck = 0;
+	udh.pl_len = len;
+	
+	err = ipv6_build_xmit(sk, udpv6_getfrag, &udh, daddr, len,
+			      saddr, dev, opt, IPPROTO_UDP, noblock);
+	
+	if (err < 0)
+		return err;
+
+	udp_stats_in6.UdpOutDatagrams++;
+	return ulen;
+}
+
+static struct inet6_protocol udpv6_protocol = 
+{
+	udpv6_rcv,		/* UDP handler		*/
+	udpv6_err,		/* UDP error control	*/
+	NULL,			/* next			*/
+	IPPROTO_UDP,		/* protocol ID		*/
+	0,			/* copy			*/
+	NULL,			/* data			*/
+	"UDPv6"			/* name			*/
+};
+
+
+struct proto udpv6_prot = {
+	udpv6_close,
+	udpv6_connect,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	datagram_select,
+	udp_ioctl,
+	NULL,
+	NULL,
+	NULL,
+	ipv6_setsockopt,
+	ipv6_getsockopt,
+	udpv6_sendmsg,
+	udpv6_recvmsg,
+	NULL,		/* No special bind function */
+	udpv6_queue_rcv_skb,
+	128,
+	0,
+	"UDP",
+	0, 0,
+	NULL
+};
+
+void udpv6_init(void)
+{
+	inet6_add_protocol(&udpv6_protocol);
+}