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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/ipv4/datagram.c
15109 views
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/*

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 *	common UDP/RAW code

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 *	Linux INET implementation

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 *

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 * Authors:

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 * 	Hideaki YOSHIFUJI <[email protected]>

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 *

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 * 	This program is free software; you can redistribute it and/or

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 * 	modify it under the terms of the GNU General Public License

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 * 	as published by the Free Software Foundation; either version

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 * 	2 of the License, or (at your option) any later version.

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 */

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#include <linux/types.h>

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#include <linux/module.h>

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#include <linux/ip.h>

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#include <linux/in.h>

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#include <net/ip.h>

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#include <net/sock.h>

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#include <net/route.h>

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#include <net/tcp_states.h>

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int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)

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{

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	struct inet_sock *inet = inet_sk(sk);

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	struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;

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	struct flowi4 *fl4;

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	struct rtable *rt;

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	__be32 saddr;

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	int oif;

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	int err;

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	if (addr_len < sizeof(*usin))

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		return -EINVAL;

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	if (usin->sin_family != AF_INET)

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		return -EAFNOSUPPORT;

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	sk_dst_reset(sk);

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	lock_sock(sk);

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	oif = sk->sk_bound_dev_if;

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	saddr = inet->inet_saddr;

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	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {

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		if (!oif)

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			oif = inet->mc_index;

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		if (!saddr)

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			saddr = inet->mc_addr;

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	}

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	fl4 = &inet->cork.fl.u.ip4;

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	rt = ip_route_connect(fl4, usin->sin_addr.s_addr, saddr,

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			      RT_CONN_FLAGS(sk), oif,

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			      sk->sk_protocol,

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			      inet->inet_sport, usin->sin_port, sk, true);

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	if (IS_ERR(rt)) {

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		err = PTR_ERR(rt);

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		if (err == -ENETUNREACH)

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			IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);

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		goto out;

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	}

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	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {

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		ip_rt_put(rt);

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		err = -EACCES;

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		goto out;

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	}

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	if (!inet->inet_saddr)

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		inet->inet_saddr = fl4->saddr;	/* Update source address */

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	if (!inet->inet_rcv_saddr) {

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		inet->inet_rcv_saddr = fl4->saddr;

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		if (sk->sk_prot->rehash)

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			sk->sk_prot->rehash(sk);

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	}

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	inet->inet_daddr = fl4->daddr;

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	inet->inet_dport = usin->sin_port;

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	sk->sk_state = TCP_ESTABLISHED;

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	inet->inet_id = jiffies;

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	sk_dst_set(sk, &rt->dst);

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	err = 0;

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out:

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	release_sock(sk);

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	return err;

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}

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EXPORT_SYMBOL(ip4_datagram_connect);

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