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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.

 *

 * Version:     $Id: protocol.c,v 1.1.1.1 2004-04-15 01:14:38 phoenix Exp $

 *

 * 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/sched.h>

#include <linux/net.h>

#include <linux/in6.h>

#include <linux/netdevice.h>

#include <linux/if_arp.h>

#include <linux/brlock.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];

void inet6_add_protocol(struct inet6_protocol *prot)

{

        unsigned char hash;

        struct inet6_protocol *p2;

        hash = prot->protocol & (MAX_INET_PROTOS - 1);

        br_write_lock_bh(BR_NETPROTO_LOCK);

        prot->next = inet6_protos[hash];

        inet6_protos[hash] = prot;

        prot->copy = 0;

        /*

         *      Set the copy bit if we need to.

         */

        p2 = (struct inet6_protocol *) prot->next;

        while(p2 != NULL) {

                if (p2->protocol == prot->protocol) {

                        prot->copy = 1;

                        break;

                }

                p2 = (struct inet6_protocol *) p2->next;

        }

        br_write_unlock_bh(BR_NETPROTO_LOCK);

}

/*

 *      Remove a protocol from the hash tables.

 */

int inet6_del_protocol(struct inet6_protocol *prot)

{

        struct inet6_protocol *p;

        struct inet6_protocol *lp = NULL;

        unsigned char hash;

        hash = prot->protocol & (MAX_INET_PROTOS - 1);

        br_write_lock_bh(BR_NETPROTO_LOCK);

        if (prot == inet6_protos[hash]) {

                inet6_protos[hash] = (struct inet6_protocol *) inet6_protos[hash]->next;

                br_write_unlock_bh(BR_NETPROTO_LOCK);

                return(0);

        }

        p = (struct inet6_protocol *) inet6_protos[hash];

        if (p != NULL && p->protocol == prot->protocol)

                lp = p;

        while(p != NULL) {

                /*

                 * We have to worry if the protocol being deleted is

                 * the last one on the list, then we may need to reset

                 * someone's copied bit.

                 */

                if (p->next != NULL && p->next == prot) {

                        /*

                         * if we are the last one with this protocol and

                         * there is a previous one, reset its copy bit.

                         */

                        if (prot->copy == 0 && lp != NULL)

                                lp->copy = 0;

                        p->next = prot->next;

                        br_write_unlock_bh(BR_NETPROTO_LOCK);

                        return(0);

                }

                if (p->next != NULL && p->next->protocol == prot->protocol)

                        lp = p->next;

                p = (struct inet6_protocol *) p->next;

        }

        br_write_unlock_bh(BR_NETPROTO_LOCK);

        return(-1);

}