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