root/net/ipv6/protocol.c

DEFINITIONS

1. inet6_add_protocol
2. inet6_del_protocol

/*
 * 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/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>

#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>

struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
static DEFINE_SPINLOCK(inet6_proto_lock);


int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
{
        int ret, hash = protocol & (MAX_INET_PROTOS - 1);

        spin_lock_bh(&inet6_proto_lock);

        if (inet6_protos[hash]) {
                ret = -1;
        } else {
                inet6_protos[hash] = prot;
                ret = 0;
        }

        spin_unlock_bh(&inet6_proto_lock);

        return ret;
}

EXPORT_SYMBOL(inet6_add_protocol);

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

int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
{
        int ret, hash = protocol & (MAX_INET_PROTOS - 1);

        spin_lock_bh(&inet6_proto_lock);

        if (inet6_protos[hash] != prot) {
                ret = -1;
        } else {
                inet6_protos[hash] = NULL;
                ret = 0;
        }

        spin_unlock_bh(&inet6_proto_lock);

        synchronize_net();

        return ret;
}

EXPORT_SYMBOL(inet6_del_protocol);