1/*
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.
5 *
6 *		PF_INET6 protocol dispatch tables.
7 *
8 * Authors:	Pedro Roque	<roque@di.fc.ul.pt>
9 *
10 *		This program is free software; you can redistribute it and/or
11 *		modify it under the terms of the GNU General Public License
12 *		as published by the Free Software Foundation; either version
13 *		2 of the License, or (at your option) any later version.
14 */
15
16/*
17 *      Changes:
18 *
19 *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001
20 *      - Removed unused variable 'inet6_protocol_base'
21 *      - Modified inet6_del_protocol() to correctly maintain copy bit.
22 */
23#include <linux/module.h>
24#include <linux/netdevice.h>
25#include <linux/spinlock.h>
26#include <net/protocol.h>
27
28const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
29static DEFINE_SPINLOCK(inet6_proto_lock);
30
31
32int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
33{
34	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
35
36	spin_lock_bh(&inet6_proto_lock);
37
38	if (inet6_protos[hash]) {
39		ret = -1;
40	} else {
41		inet6_protos[hash] = prot;
42		ret = 0;
43	}
44
45	spin_unlock_bh(&inet6_proto_lock);
46
47	return ret;
48}
49
50EXPORT_SYMBOL(inet6_add_protocol);
51
52/*
53 *	Remove a protocol from the hash tables.
54 */
55
56int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
57{
58	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
59
60	spin_lock_bh(&inet6_proto_lock);
61
62	if (inet6_protos[hash] != prot) {
63		ret = -1;
64	} else {
65		inet6_protos[hash] = NULL;
66		ret = 0;
67	}
68
69	spin_unlock_bh(&inet6_proto_lock);
70
71	synchronize_net();
72
73	return ret;
74}
75
76EXPORT_SYMBOL(inet6_del_protocol);
77