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linux
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 __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
29
30int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
31{
32 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
33 NULL, prot) ? 0 : -1;
34}
35EXPORT_SYMBOL(inet6_add_protocol);
36
37/*
38 * Remove a protocol from the hash tables.
39 */
40
41int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
42{
43 int ret;
44
45 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
46 prot, NULL) == prot) ? 0 : -1;
47
48 synchronize_net();
49
50 return ret;
51}
52EXPORT_SYMBOL(inet6_del_protocol);