/* *	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->saddr;	if (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->sport, usin->sin_port, sk, 1);	if (err)		return err;	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {		ip_rt_put(rt);		return -EACCES;	}	if (!inet->saddr)		inet->saddr = rt->rt_src;	/* Update source address */	if (!inet->rcv_saddr)		inet->rcv_saddr = rt->rt_src;	inet->daddr = rt->rt_dst;	inet->dport = usin->sin_port;	sk->sk_state = TCP_ESTABLISHED;	inet->id = jiffies; 	sk_dst_set(sk, &rt->u.dst);	return(0);} EXPORT_SYMBOL(ip4_datagram_connect);