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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 1.10 2001/05/18 02:25:49 davem 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);
}
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