[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/sched.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];
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>
	33	#include <linux/sched.h>
	34	#include <linux/string.h>
1da177e4 LT	35	#include <linux/socket.h>
	36	#include <linux/in.h>
	37	#include <linux/inet.h>
	38	#include <linux/netdevice.h>
	39	#include <linux/timer.h>
	40	#include <net/ip.h>
	41	#include <net/protocol.h>
1da177e4 LT	42	#include <linux/skbuff.h>
	43	#include <net/sock.h>
	44	#include <net/icmp.h>
	45	#include <net/udp.h>
	46	#include <net/ipip.h>
	47	#include <linux/igmp.h>
	48
	49	struct net_protocol *inet_protos[MAX_INET_PROTOS];
	50	static DEFINE_SPINLOCK(inet_proto_lock);
	51
	52	/*
	53	* Add a protocol handler to the hash tables
	54	*/
	55
	56	int inet_add_protocol(struct net_protocol *prot, unsigned char protocol)
	57	{
	58	int hash, ret;
	59
	60	hash = protocol & (MAX_INET_PROTOS - 1);
	61
	62	spin_lock_bh(&inet_proto_lock);
	63	if (inet_protos[hash]) {
	64	ret = -1;
	65	} else {
	66	inet_protos[hash] = prot;
	67	ret = 0;
	68	}
	69	spin_unlock_bh(&inet_proto_lock);
	70
	71	return ret;
	72	}
	73
	74	/*
	75	* Remove a protocol from the hash tables.
	76	*/
	77
	78	int inet_del_protocol(struct net_protocol *prot, unsigned char protocol)
	79	{
	80	int hash, ret;
	81
	82	hash = protocol & (MAX_INET_PROTOS - 1);
	83
	84	spin_lock_bh(&inet_proto_lock);
	85	if (inet_protos[hash] == prot) {
	86	inet_protos[hash] = NULL;
	87	ret = 0;
	88	} else {
	89	ret = -1;
	90	}
	91	spin_unlock_bh(&inet_proto_lock);
	92
	93	synchronize_net();
	94
	95	return ret;
	96	}
	97
	98	EXPORT_SYMBOL(inet_add_protocol);
	99	EXPORT_SYMBOL(inet_del_protocol);