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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 * Version: $Id: protocol.c,v 1.10 2001/05/18 02:25:49 davem Exp $
9 *
10 * Authors: Pedro Roque <roque@di.fc.ul.pt>
11 *
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.
16 */
17
18/*
19 * Changes:
20 *
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.
24 */
25
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
36#include <net/sock.h>
37#include <net/snmp.h>
38
39#include <net/ipv6.h>
40#include <net/protocol.h>
41
42struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
43static DEFINE_SPINLOCK(inet6_proto_lock);
44
45
46int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
47{
48 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
49
50 spin_lock_bh(&inet6_proto_lock);
51
52 if (inet6_protos[hash]) {
53 ret = -1;
54 } else {
55 inet6_protos[hash] = prot;
56 ret = 0;
57 }
58
59 spin_unlock_bh(&inet6_proto_lock);
60
61 return ret;
62}
63
64/*
65 * Remove a protocol from the hash tables.
66 */
67
68int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
69{
70 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
71
72 spin_lock_bh(&inet6_proto_lock);
73
74 if (inet6_protos[hash] != prot) {
75 ret = -1;
76 } else {
77 inet6_protos[hash] = NULL;
78 ret = 0;
79 }
80
81 spin_unlock_bh(&inet6_proto_lock);
82
83 synchronize_net();
84
85 return ret;
86}