[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv4 / datagram.c

/*
 *	common UDP/RAW code
 *	Linux INET implementation
 *
 * Authors:
 * 	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
 *
 * 	This program is free software; you can redistribute it and/or
 * 	modify it under the terms of the GNU General Public License
 * 	as published by the Free Software Foundation; either version
 * 	2 of the License, or (at your option) any later version.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <net/ip.h>
#include <net/sock.h>
#include <net/route.h>
#include <net/tcp_states.h>

int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
	struct inet_sock *inet = inet_sk(sk);
	struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;
	struct flowi4 *fl4;
	struct rtable *rt;
	__be32 saddr;
	int oif;
	int err;


	if (addr_len < sizeof(*usin))
		return -EINVAL;

	if (usin->sin_family != AF_INET)
		return -EAFNOSUPPORT;

	sk_dst_reset(sk);

	lock_sock(sk);

	oif = sk->sk_bound_dev_if;
	saddr = inet->inet_saddr;
	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
		if (!oif)
			oif = inet->mc_index;
		if (!saddr)
			saddr = inet->mc_addr;
	}
	fl4 = &inet->cork.fl.u.ip4;
	rt = ip_route_connect(fl4, usin->sin_addr.s_addr, saddr,
			      RT_CONN_FLAGS(sk), oif,
			      sk->sk_protocol,
			      inet->inet_sport, usin->sin_port, sk, true);
	if (IS_ERR(rt)) {
		err = PTR_ERR(rt);
		if (err == -ENETUNREACH)
			IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
		goto out;
	}

	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
		ip_rt_put(rt);
		err = -EACCES;
		goto out;
	}
	if (!inet->inet_saddr)
		inet->inet_saddr = fl4->saddr;	/* Update source address */
	if (!inet->inet_rcv_saddr) {
		inet->inet_rcv_saddr = fl4->saddr;
		if (sk->sk_prot->rehash)
			sk->sk_prot->rehash(sk);
	}
	inet->inet_daddr = fl4->daddr;
	inet->inet_dport = usin->sin_port;
	sk->sk_state = TCP_ESTABLISHED;
	inet->inet_id = jiffies;

	sk_dst_set(sk, &rt->dst);
	err = 0;
out:
	release_sock(sk);
	return err;
}
EXPORT_SYMBOL(ip4_datagram_connect);

/* Because UDP xmit path can manipulate sk_dst_cache without holding
 * socket lock, we need to use sk_dst_set() here,
 * even if we own the socket lock.
 */
void ip4_datagram_release_cb(struct sock *sk)
{
	const struct inet_sock *inet = inet_sk(sk);
	const struct ip_options_rcu *inet_opt;
	__be32 daddr = inet->inet_daddr;
	struct dst_entry *dst;
	struct flowi4 fl4;
	struct rtable *rt;

	rcu_read_lock();

	dst = __sk_dst_get(sk);
	if (!dst || !dst->obsolete || dst->ops->check(dst, 0)) {
		rcu_read_unlock();
		return;
	}
	inet_opt = rcu_dereference(inet->inet_opt);
	if (inet_opt && inet_opt->opt.srr)
		daddr = inet_opt->opt.faddr;
	rt = ip_route_output_ports(sock_net(sk), &fl4, sk, daddr,
				   inet->inet_saddr, inet->inet_dport,
				   inet->inet_sport, sk->sk_protocol,
				   RT_CONN_FLAGS(sk), sk->sk_bound_dev_if);

	dst = !IS_ERR(rt) ? &rt->dst : NULL;
	sk_dst_set(sk, dst);

	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ip4_datagram_release_cb);
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);
3038eeac DM	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;
3038eeac DM	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)
ac6a5b92	60	IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
3038eeac	61	goto out;
584bdf8c WD	62	}
584bdf8c WD	63
1da177e4 LT	64	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
1da177e4 LT	65	ip_rt_put(rt);
3038eeac DM	66	err = -EACCES;
3038eeac DM	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);
8141ed9f	88
9138f241 ED	89	/* Because UDP xmit path can manipulate sk_dst_cache without holding
	90	* socket lock, we need to use sk_dst_set() here,
	91	* even if we own the socket lock.
	92	*/
8141ed9f SK	93	void ip4_datagram_release_cb(struct sock *sk)
	94	{
	95	const struct inet_sock *inet = inet_sk(sk);
	96	const struct ip_options_rcu *inet_opt;
	97	__be32 daddr = inet->inet_daddr;
9138f241	98	struct dst_entry *dst;
8141ed9f SK	99	struct flowi4 fl4;
	100	struct rtable *rt;
	101
8141ed9f	102	rcu_read_lock();
9138f241 ED	103
	104	dst = __sk_dst_get(sk);
	105	if (!dst \|\| !dst->obsolete \|\| dst->ops->check(dst, 0)) {
	106	rcu_read_unlock();
	107	return;
	108	}
8141ed9f SK	109	inet_opt = rcu_dereference(inet->inet_opt);
	110	if (inet_opt && inet_opt->opt.srr)
	111	daddr = inet_opt->opt.faddr;
	112	rt = ip_route_output_ports(sock_net(sk), &fl4, sk, daddr,
	113	inet->inet_saddr, inet->inet_dport,
	114	inet->inet_sport, sk->sk_protocol,
	115	RT_CONN_FLAGS(sk), sk->sk_bound_dev_if);
9138f241 ED	116
	117	dst = !IS_ERR(rt) ? &rt->dst : NULL;
	118	sk_dst_set(sk, dst);
	119
8141ed9f SK	120	rcu_read_unlock();
	121	}
	122	EXPORT_SYMBOL_GPL(ip4_datagram_release_cb);