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 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; 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->inet_saddr; 43 if (ipv4_is_multicast(usin->sin_addr.s_addr)) { 44 if (!oif) 45 oif = inet->mc_index; 46 if (!saddr) 47 saddr = inet->mc_addr; 48 } 49 rt = ip_route_connect(usin->sin_addr.s_addr, saddr, 50 RT_CONN_FLAGS(sk), oif, 51 sk->sk_protocol, 52 inet->inet_sport, usin->sin_port, sk, true); 53 if (IS_ERR(rt)) { 54 err = PTR_ERR(rt); 55 if (err == -ENETUNREACH) 56 IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); 57 return err; 58 } 59 60 if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) { 61 ip_rt_put(rt); 62 return -EACCES; 63 } 64 if (!inet->inet_saddr) 65 inet->inet_saddr = rt->rt_src; /* Update source address */ 66 if (!inet->inet_rcv_saddr) { 67 inet->inet_rcv_saddr = rt->rt_src; 68 if (sk->sk_prot->rehash) 69 sk->sk_prot->rehash(sk); 70 } 71 inet->inet_daddr = rt->rt_dst; 72 inet->inet_dport = usin->sin_port; 73 sk->sk_state = TCP_ESTABLISHED; 74 inet->inet_id = jiffies; 75 76 sk_dst_set(sk, &rt->dst); 77 return 0; 78 } 79 EXPORT_SYMBOL(ip4_datagram_connect); 80