[net-next-2.6.git] / net / ipv4 / protocol.c

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		INET protocol dispatch tables.
 *
 * Version:	$Id: protocol.c,v 1.14 2001/05/18 02:25:49 davem Exp $
 *
 * Authors:	Ross Biro
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 * Fixes:
 *		Alan Cox	: Ahah! udp icmp errors don't work because
 *				  udp_err is never called!
 *		Alan Cox	: Added new fields for init and ready for
 *				  proper fragmentation (_NO_ 4K limits!)
 *		Richard Colella	: Hang on hash collision
 *		Vince Laviano	: Modified inet_del_protocol() to correctly
 *				  maintain copy bit.
 *
 *		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 <asm/uaccess.h>
#include <asm/system.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/ipip.h>
#include <linux/igmp.h>

struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp;
static DEFINE_SPINLOCK(inet_proto_lock);

/*
 *	Add a protocol handler to the hash tables
 */

int inet_add_protocol(struct net_protocol *prot, unsigned char protocol)
{
	int hash, ret;

	hash = protocol & (MAX_INET_PROTOS - 1);

	spin_lock_bh(&inet_proto_lock);
	if (inet_protos[hash]) {
		ret = -1;
	} else {
		inet_protos[hash] = prot;
		ret = 0;
	}
	spin_unlock_bh(&inet_proto_lock);

	return ret;
}

/*
 *	Remove a protocol from the hash tables.
 */

int inet_del_protocol(struct net_protocol *prot, unsigned char protocol)
{
	int hash, ret;

	hash = protocol & (MAX_INET_PROTOS - 1);

	spin_lock_bh(&inet_proto_lock);
	if (inet_protos[hash] == prot) {
		inet_protos[hash] = NULL;
		ret = 0;
	} else {
		ret = -1;
	}
	spin_unlock_bh(&inet_proto_lock);

	synchronize_net();

	return ret;
}

EXPORT_SYMBOL(inet_add_protocol);
EXPORT_SYMBOL(inet_del_protocol);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* INET protocol dispatch tables.
	7	*
	8	* Version: $Id: protocol.c,v 1.14 2001/05/18 02:25:49 davem Exp $
	9	*
02c30a84	10	* Authors: Ross Biro
1da177e4 LT	11	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	12	*
	13	* Fixes:
	14	* Alan Cox : Ahah! udp icmp errors don't work because
	15	* udp_err is never called!
	16	* Alan Cox : Added new fields for init and ready for
	17	* proper fragmentation (_NO_ 4K limits!)
	18	* Richard Colella : Hang on hash collision
	19	* Vince Laviano : Modified inet_del_protocol() to correctly
	20	* maintain copy bit.
	21	*
	22	* This program is free software; you can redistribute it and/or
	23	* modify it under the terms of the GNU General Public License
	24	* as published by the Free Software Foundation; either version
	25	* 2 of the License, or (at your option) any later version.
	26	*/
	27
	28	#include <asm/uaccess.h>
	29	#include <asm/system.h>
	30	#include <linux/module.h>
	31	#include <linux/types.h>
	32	#include <linux/kernel.h>
1da177e4	33	#include <linux/string.h>
1da177e4 LT	34	#include <linux/socket.h>
	35	#include <linux/in.h>
	36	#include <linux/inet.h>
	37	#include <linux/netdevice.h>
	38	#include <linux/timer.h>
	39	#include <net/ip.h>
	40	#include <net/protocol.h>
1da177e4 LT	41	#include <linux/skbuff.h>
	42	#include <net/sock.h>
	43	#include <net/icmp.h>
	44	#include <net/udp.h>
	45	#include <net/ipip.h>
	46	#include <linux/igmp.h>
	47
03d4f879	48	struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp;
1da177e4 LT	49	static DEFINE_SPINLOCK(inet_proto_lock);
	50
	51	/*
	52	* Add a protocol handler to the hash tables
	53	*/
	54
	55	int inet_add_protocol(struct net_protocol *prot, unsigned char protocol)
	56	{
	57	int hash, ret;
	58
	59	hash = protocol & (MAX_INET_PROTOS - 1);
	60
	61	spin_lock_bh(&inet_proto_lock);
	62	if (inet_protos[hash]) {
	63	ret = -1;
	64	} else {
	65	inet_protos[hash] = prot;
	66	ret = 0;
	67	}
	68	spin_unlock_bh(&inet_proto_lock);
	69
	70	return ret;
	71	}
	72
	73	/*
	74	* Remove a protocol from the hash tables.
	75	*/
e905a9ed	76
1da177e4 LT	77	int inet_del_protocol(struct net_protocol *prot, unsigned char protocol)
	78	{
	79	int hash, ret;
	80
	81	hash = protocol & (MAX_INET_PROTOS - 1);
	82
	83	spin_lock_bh(&inet_proto_lock);
	84	if (inet_protos[hash] == prot) {
	85	inet_protos[hash] = NULL;
	86	ret = 0;
	87	} else {
	88	ret = -1;
	89	}
	90	spin_unlock_bh(&inet_proto_lock);
	91
	92	synchronize_net();
	93
	94	return ret;
	95	}
	96
	97	EXPORT_SYMBOL(inet_add_protocol);
	98	EXPORT_SYMBOL(inet_del_protocol);