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
14#include <linux/types.h>
15#include <linux/module.h>
16#include <linux/ip.h>
17#include <linux/in.h>
18#include <net/ip.h>
19#include <net/sock.h>
20#include <net/route.h>
21#include <net/tcp_states.h>
22
23int 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;
28	__be32 saddr;
29	int oif;
30	int err;
31
32
33	if (addr_len < sizeof(*usin))
34		return -EINVAL;
35
36	if (usin->sin_family != AF_INET)
37		return -EAFNOSUPPORT;
38
39	sk_dst_reset(sk);
40
41	oif = sk->sk_bound_dev_if;
42	saddr = inet->saddr;
43	if (MULTICAST(usin->sin_addr.s_addr)) {
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,
52			       inet->sport, usin->sin_port, sk, 1);
53	if (err) {
54		if (err == -ENETUNREACH)
55			IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
56		return err;
57	}
58
59	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
60		ip_rt_put(rt);
61		return -EACCES;
62	}
63	if (!inet->saddr)
64		inet->saddr = rt->rt_src;	/* Update source address */
65	if (!inet->rcv_saddr)
66		inet->rcv_saddr = rt->rt_src;
67	inet->daddr = rt->rt_dst;
68	inet->dport = usin->sin_port;
69	sk->sk_state = TCP_ESTABLISHED;
70	inet->id = jiffies;
71
72	sk_dst_set(sk, &rt->u.dst);
73	return(0);
74}
75
76EXPORT_SYMBOL(ip4_datagram_connect);
77