Release 4.8 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;
}
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EXPORT_SYMBOL(inet6_add_protocol);



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;
}
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EXPORT_SYMBOL(inet6_del_protocol);
#endif


const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;

EXPORT_SYMBOL(inet6_offloads);



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;
}
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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;
}
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EXPORT_SYMBOL(inet6_del_offload);
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Directory: net/ipv6

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