2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * PF_INET6 protocol dispatch tables.
8 * Version: $Id: protocol.c,v 1.10 2001/05/18 02:25:49 davem Exp $
10 * Authors: Pedro Roque <pedro_m@yahoo.com>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
21 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
22 * - Removed unused variable 'inet6_protocol_base'
23 * - Modified inet6_del_protocol() to correctly maintain copy bit.
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/sockios.h>
30 #include <linux/sched.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/netdevice.h>
34 #include <linux/if_arp.h>
35 #include <linux/brlock.h>
41 #include <net/protocol.h>
43 struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
45 void inet6_add_protocol(struct inet6_protocol *prot)
48 struct inet6_protocol *p2;
50 hash = prot->protocol & (MAX_INET_PROTOS - 1);
51 br_write_lock_bh(BR_NETPROTO_LOCK);
52 prot->next = inet6_protos[hash];
53 inet6_protos[hash] = prot;
57 * Set the copy bit if we need to.
60 p2 = (struct inet6_protocol *) prot->next;
62 if (p2->protocol == prot->protocol) {
66 p2 = (struct inet6_protocol *) p2->next;
68 br_write_unlock_bh(BR_NETPROTO_LOCK);
72 * Remove a protocol from the hash tables.
75 int inet6_del_protocol(struct inet6_protocol *prot)
77 struct inet6_protocol *p;
78 struct inet6_protocol *lp = NULL;
81 hash = prot->protocol & (MAX_INET_PROTOS - 1);
82 br_write_lock_bh(BR_NETPROTO_LOCK);
83 if (prot == inet6_protos[hash]) {
84 inet6_protos[hash] = (struct inet6_protocol *) inet6_protos[hash]->next;
85 br_write_unlock_bh(BR_NETPROTO_LOCK);
89 p = (struct inet6_protocol *) inet6_protos[hash];
91 if (p != NULL && p->protocol == prot->protocol)
96 * We have to worry if the protocol being deleted is
97 * the last one on the list, then we may need to reset
98 * someone's copied bit.
100 if (p->next != NULL && p->next == prot) {
102 * if we are the last one with this protocol and
103 * there is a previous one, reset its copy bit.
105 if (prot->copy == 0 && lp != NULL)
107 p->next = prot->next;
108 br_write_unlock_bh(BR_NETPROTO_LOCK);
111 if (p->next != NULL && p->next->protocol == prot->protocol)
114 p = (struct inet6_protocol *) p->next;
116 br_write_unlock_bh(BR_NETPROTO_LOCK);