projects / linux-2.6-block.git / blame
| 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; | |
| 3038eeac | 27 | struct flowi4 *fl4; |
| 1da177e4 | 28 | struct rtable *rt; |
| bada8adc | 29 | __be32 saddr; |
| 1da177e4 LT |
30 | int oif; |
| 31 | int err; | |
| 32 | ||
| 1da177e4 | 33 | |
| e905a9ed YH |
34 | if (addr_len < sizeof(*usin)) |
| 35 | return -EINVAL; | |
| 36 | ||
| 37 | if (usin->sin_family != AF_INET) | |
| 38 | return -EAFNOSUPPORT; | |
| 1da177e4 LT |
39 | |
| 40 | sk_dst_reset(sk); | |
| 41 | ||
| 3038eeac DM |
42 | lock_sock(sk); |
| 43 | ||
| 1da177e4 | 44 | oif = sk->sk_bound_dev_if; |
| c720c7e8 | 45 | saddr = inet->inet_saddr; |
| f97c1e0c | 46 | if (ipv4_is_multicast(usin->sin_addr.s_addr)) { |
| 1da177e4 LT |
47 | if (!oif) |
| 48 | oif = inet->mc_index; | |
| 49 | if (!saddr) | |
| 50 | saddr = inet->mc_addr; | |
| 51 | } | |
| 3038eeac DM |
52 | fl4 = &inet->cork.fl.u.ip4; |
| 53 | rt = ip_route_connect(fl4, usin->sin_addr.s_addr, saddr, | |
| b23dd4fe DM |
54 | RT_CONN_FLAGS(sk), oif, |
| 55 | sk->sk_protocol, | |
| 56 | inet->inet_sport, usin->sin_port, sk, true); | |
| 57 | if (IS_ERR(rt)) { | |
| 58 | err = PTR_ERR(rt); | |
| 584bdf8c | 59 | if (err == -ENETUNREACH) |
| 7c73a6fa | 60 | IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
| 3038eeac | 61 | goto out; |
| 584bdf8c WD |
62 | } |
| 63 | ||
| 1da177e4 LT |
64 | if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) { |
| 65 | ip_rt_put(rt); | |
| 3038eeac DM |
66 | err = -EACCES; |
| 67 | goto out; | |
| 1da177e4 | 68 | } |
| c720c7e8 | 69 | if (!inet->inet_saddr) |
| 3038eeac | 70 | inet->inet_saddr = fl4->saddr; /* Update source address */ |
| 719f8358 | 71 | if (!inet->inet_rcv_saddr) { |
| 3038eeac | 72 | inet->inet_rcv_saddr = fl4->saddr; |
| 719f8358 ED |
73 | if (sk->sk_prot->rehash) |
| 74 | sk->sk_prot->rehash(sk); | |
| 75 | } | |
| 3038eeac | 76 | inet->inet_daddr = fl4->daddr; |
| c720c7e8 | 77 | inet->inet_dport = usin->sin_port; |
| 1da177e4 | 78 | sk->sk_state = TCP_ESTABLISHED; |
| c720c7e8 | 79 | inet->inet_id = jiffies; |
| 1da177e4 | 80 | |
| d8d1f30b | 81 | sk_dst_set(sk, &rt->dst); |
| 3038eeac DM |
82 | err = 0; |
| 83 | out: | |
| 84 | release_sock(sk); | |
| 85 | return err; | |
| 1da177e4 | 86 | } |
| 1da177e4 | 87 | EXPORT_SYMBOL(ip4_datagram_connect); |