[GitHub/mt8127/android_kernel_alcatel_ttab.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>

#if IS_ENABLED(CONFIG_IPV6)
const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
EXPORT_SYMBOL(inet6_protos);

int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
{
	return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
			NULL, prot) ? 0 : -1;
}
EXPORT_SYMBOL(inet6_add_protocol);

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

int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
{
	int ret;

	ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
		       prot, NULL) == prot) ? 0 : -1;

	synchronize_net();

	return ret;
}
EXPORT_SYMBOL(inet6_del_protocol);
#endif

const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;

int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
{
	return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
			NULL, prot) ? 0 : -1;
}
EXPORT_SYMBOL(inet6_add_offload);

int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
{
	int ret;

	ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
		       prot, NULL) == prot) ? 0 : -1;

	synchronize_net();

	return ret;
}
EXPORT_SYMBOL(inet6_del_offload);
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>
1da177e4 LT	27
c6b641a4	28	#if IS_ENABLED(CONFIG_IPV6)
e0ad61ec	29	const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
c6b641a4	30	EXPORT_SYMBOL(inet6_protos);
1da177e4	31
41135cc8	32	int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
1da177e4	33	{
f9242b6b	34	return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
e0ad61ec	35	NULL, prot) ? 0 : -1;
1da177e4	36	}
7159039a YH	37	EXPORT_SYMBOL(inet6_add_protocol);
7159039a YH	38
1da177e4 LT	39	/*
	40	* Remove a protocol from the hash tables.
	41	*/
1ab1457c	42
41135cc8	43	int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
1da177e4	44	{
f9242b6b	45	int ret;
1da177e4	46
f9242b6b	47	ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
e0ad61ec	48	prot, NULL) == prot) ? 0 : -1;
1da177e4 LT	49
	50	synchronize_net();
	51
	52	return ret;
	53	}
7159039a	54	EXPORT_SYMBOL(inet6_del_protocol);
c6b641a4 VY	55	#endif
	56
	57	const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
	58
	59	int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
	60	{
	61	return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
	62	NULL, prot) ? 0 : -1;
	63	}
	64	EXPORT_SYMBOL(inet6_add_offload);
8ca896cf VY	65
	66	int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
	67	{
	68	int ret;
	69
	70	ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
	71	prot, NULL) == prot) ? 0 : -1;
	72
	73	synchronize_net();
	74
	75	return ret;
	76	}
	77	EXPORT_SYMBOL(inet6_del_offload);