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/config.h> 15 #include <linux/types.h> 16 #include <linux/module.h> 17 #include <linux/ip.h> 18 #include <linux/in.h> 19 #include <net/ip.h> 20 #include <net/sock.h> 21 #include <net/route.h> 22 #include <net/tcp_states.h> 23 24 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 25 { 26 struct inet_sock *inet = inet_sk(sk); 27 struct sockaddr_in *usin = (struct sockaddr_in *) uaddr; 28 struct rtable *rt; 29 u32 saddr; 30 int oif; 31 int err; 32 33 34 if (addr_len < sizeof(*usin)) 35 return -EINVAL; 36 37 if (usin->sin_family != AF_INET) 38 return -EAFNOSUPPORT; 39 40 sk_dst_reset(sk); 41 42 oif = sk->sk_bound_dev_if; 43 saddr = inet->saddr; 44 if (MULTICAST(usin->sin_addr.s_addr)) { 45 if (!oif) 46 oif = inet->mc_index; 47 if (!saddr) 48 saddr = inet->mc_addr; 49 } 50 err = ip_route_connect(&rt, usin->sin_addr.s_addr, saddr, 51 RT_CONN_FLAGS(sk), oif, 52 sk->sk_protocol, 53 inet->sport, usin->sin_port, sk); 54 if (err) 55 return err; 56 if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) { 57 ip_rt_put(rt); 58 return -EACCES; 59 } 60 if (!inet->saddr) 61 inet->saddr = rt->rt_src; /* Update source address */ 62 if (!inet->rcv_saddr) 63 inet->rcv_saddr = rt->rt_src; 64 inet->daddr = rt->rt_dst; 65 inet->dport = usin->sin_port; 66 sk->sk_state = TCP_ESTABLISHED; 67 inet->id = jiffies; 68 69 sk_dst_set(sk, &rt->u.dst); 70 return(0); 71 } 72 73 EXPORT_SYMBOL(ip4_datagram_connect); 74 75