[net-next-2.6.git] / net / ipv4 / datagram.c

/*
 *	common UDP/RAW code
 *	Linux INET implementation
 *
 * Authors:
 * 	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
 *
 * 	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/types.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <net/ip.h>
#include <net/sock.h>
#include <net/route.h>
#include <net/tcp_states.h>

int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
	struct inet_sock *inet = inet_sk(sk);
	struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;
	struct rtable *rt;
	__be32 saddr;
	int oif;
	int err;


	if (addr_len < sizeof(*usin))
		return -EINVAL;

	if (usin->sin_family != AF_INET)
		return -EAFNOSUPPORT;

	sk_dst_reset(sk);

	oif = sk->sk_bound_dev_if;
	saddr = inet->inet_saddr;
	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
		if (!oif)
			oif = inet->mc_index;
		if (!saddr)
			saddr = inet->mc_addr;
	}
	err = ip_route_connect(&rt, usin->sin_addr.s_addr, saddr,
			       RT_CONN_FLAGS(sk), oif,
			       sk->sk_protocol,
			       inet->inet_sport, usin->sin_port, sk, 1);
	if (err) {
		if (err == -ENETUNREACH)
			IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
		return err;
	}

	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
		ip_rt_put(rt);
		return -EACCES;
	}
	if (!inet->inet_saddr)
		inet->inet_saddr = rt->rt_src;	/* Update source address */
	if (!inet->inet_rcv_saddr)
		inet->inet_rcv_saddr = rt->rt_src;
	inet->inet_daddr = rt->rt_dst;
	inet->inet_dport = usin->sin_port;
	sk->sk_state = TCP_ESTABLISHED;
	inet->inet_id = jiffies;

	sk_dst_set(sk, &rt->dst);
	return(0);
}

EXPORT_SYMBOL(ip4_datagram_connect);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* common UDP/RAW code
	3	* Linux INET implementation
	4	*
	5	* Authors:
	6	* Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
1da177e4 LT	14	#include <linux/types.h>
	15	#include <linux/module.h>
	16	#include <linux/ip.h>
	17	#include <linux/in.h>
20380731	18	#include <net/ip.h>
1da177e4	19	#include <net/sock.h>
1da177e4	20	#include <net/route.h>
c752f073	21	#include <net/tcp_states.h>
1da177e4 LT	22
	23	int ip4_datagram_connect(struct sock sk, struct sockaddr uaddr, int addr_len)
	24	{
	25	struct inet_sock *inet = inet_sk(sk);
	26	struct sockaddr_in usin = (struct sockaddr_in ) uaddr;
	27	struct rtable *rt;
bada8adc	28	__be32 saddr;
1da177e4 LT	29	int oif;
	30	int err;
	31
1da177e4	32
e905a9ed YH	33	if (addr_len < sizeof(*usin))
	34	return -EINVAL;
	35
	36	if (usin->sin_family != AF_INET)
	37	return -EAFNOSUPPORT;
1da177e4 LT	38
	39	sk_dst_reset(sk);
	40
	41	oif = sk->sk_bound_dev_if;
c720c7e8	42	saddr = inet->inet_saddr;
f97c1e0c	43	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
1da177e4 LT	44	if (!oif)
	45	oif = inet->mc_index;
	46	if (!saddr)
	47	saddr = inet->mc_addr;
	48	}
	49	err = ip_route_connect(&rt, usin->sin_addr.s_addr, saddr,
	50	RT_CONN_FLAGS(sk), oif,
	51	sk->sk_protocol,
c720c7e8	52	inet->inet_sport, usin->sin_port, sk, 1);
584bdf8c WD	53	if (err) {
584bdf8c WD	54	if (err == -ENETUNREACH)
7c73a6fa	55	IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
1da177e4	56	return err;
584bdf8c WD	57	}
584bdf8c WD	58
1da177e4 LT	59	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
	60	ip_rt_put(rt);
	61	return -EACCES;
	62	}
c720c7e8 ED	63	if (!inet->inet_saddr)
	64	inet->inet_saddr = rt->rt_src; /* Update source address */
	65	if (!inet->inet_rcv_saddr)
	66	inet->inet_rcv_saddr = rt->rt_src;
	67	inet->inet_daddr = rt->rt_dst;
	68	inet->inet_dport = usin->sin_port;
1da177e4	69	sk->sk_state = TCP_ESTABLISHED;
c720c7e8	70	inet->inet_id = jiffies;
1da177e4	71
d8d1f30b	72	sk_dst_set(sk, &rt->dst);
1da177e4 LT	73	return(0);
	74	}
	75
	76	EXPORT_SYMBOL(ip4_datagram_connect);
	77