protocol.c

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/*
 * 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 <[email protected]>
 *
 *      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 ([email protected])       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>

const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;

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);