- /*
- * 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);
- }