blob: 9a7978fdc02a5de453feb7c4ca1ea9c1e7652292 [file] [log] [blame]
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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 */
Alexey Dobriyanfa1a9c62009-09-09 03:43:50 -070023#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/netdevice.h>
Alexey Dobriyanfa1a9c62009-09-09 03:43:50 -070025#include <linux/spinlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <net/protocol.h>
27
Eric Dumazete0ad61e2010-10-25 21:02:28 +000028const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Alexey Dobriyan41135cc2009-09-14 12:22:28 +000030int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
Eric Dumazete0386002010-09-08 21:31:35 -070032 int hash = protocol & (MAX_INET_PROTOS - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Eric Dumazete0ad61e2010-10-25 21:02:28 +000034 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
35 NULL, prot) ? 0 : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036}
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +090037EXPORT_SYMBOL(inet6_add_protocol);
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039/*
40 * Remove a protocol from the hash tables.
41 */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090042
Alexey Dobriyan41135cc2009-09-14 12:22:28 +000043int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
45 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
46
Eric Dumazete0ad61e2010-10-25 21:02:28 +000047 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
48 prot, NULL) == prot) ? 0 : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50 synchronize_net();
51
52 return ret;
53}
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +090054EXPORT_SYMBOL(inet6_del_protocol);