[linux-block.git] / net / ipv6 / 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.
 *
 *		PF_INET6 protocol dispatch tables.
 *
 * Authors:	Pedro Roque	<roque@di.fc.ul.pt>
 *
 *		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.
 */

/*
 *      Changes:
 *
 *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001
 *      - Removed unused variable 'inet6_protocol_base'
 *      - Modified inet6_del_protocol() to correctly maintain copy bit.
 */
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <net/protocol.h>

struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
static DEFINE_SPINLOCK(inet6_proto_lock);


int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
{
	int ret, hash = protocol & (MAX_INET_PROTOS - 1);

	spin_lock_bh(&inet6_proto_lock);

	if (inet6_protos[hash]) {
		ret = -1;
	} else {
		inet6_protos[hash] = prot;
		ret = 0;
	}

	spin_unlock_bh(&inet6_proto_lock);

	return ret;
}

EXPORT_SYMBOL(inet6_add_protocol);

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

int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
{
	int ret, hash = protocol & (MAX_INET_PROTOS - 1);

	spin_lock_bh(&inet6_proto_lock);

	if (inet6_protos[hash] != prot) {
		ret = -1;
	} else {
		inet6_protos[hash] = NULL;
		ret = 0;
	}

	spin_unlock_bh(&inet6_proto_lock);

	synchronize_net();

	return ret;
}

EXPORT_SYMBOL(inet6_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	* PF_INET6 protocol dispatch tables.
	7	*
1da177e4 LT	8	* Authors: Pedro Roque <roque@di.fc.ul.pt>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	/*
	17	* Changes:
	18	*
	19	* Vince Laviano (vince@cs.stanford.edu) 16 May 2001
	20	* - Removed unused variable 'inet6_protocol_base'
	21	* - Modified inet6_del_protocol() to correctly maintain copy bit.
	22	*/
fa1a9c68	23	#include <linux/module.h>
1da177e4	24	#include <linux/netdevice.h>
fa1a9c68	25	#include <linux/spinlock.h>
1da177e4 LT	26	#include <net/protocol.h>
	27
	28	struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
	29	static DEFINE_SPINLOCK(inet6_proto_lock);
	30
	31
	32	int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
	33	{
	34	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
	35
	36	spin_lock_bh(&inet6_proto_lock);
	37
	38	if (inet6_protos[hash]) {
	39	ret = -1;
	40	} else {
	41	inet6_protos[hash] = prot;
	42	ret = 0;
	43	}
	44
	45	spin_unlock_bh(&inet6_proto_lock);
	46
	47	return ret;
	48	}
	49
7159039a YH	50	EXPORT_SYMBOL(inet6_add_protocol);
7159039a YH	51
1da177e4 LT	52	/*
	53	* Remove a protocol from the hash tables.
	54	*/
1ab1457c	55
1da177e4 LT	56	int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
	57	{
	58	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
	59
	60	spin_lock_bh(&inet6_proto_lock);
	61
	62	if (inet6_protos[hash] != prot) {
	63	ret = -1;
	64	} else {
	65	inet6_protos[hash] = NULL;
	66	ret = 0;
	67	}
	68
	69	spin_unlock_bh(&inet6_proto_lock);
	70
	71	synchronize_net();
	72
	73	return ret;
	74	}
7159039a YH	75
7159039a YH	76	EXPORT_SYMBOL(inet6_del_protocol);