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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 *
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
Vlad Yasevichc6b641a2012-11-15 08:49:22 +000028#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazete0ad61e2010-10-25 21:02:28 +000029const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
Vlad Yasevichc6b641a2012-11-15 08:49:22 +000030EXPORT_SYMBOL(inet6_protos);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Alexey Dobriyan41135cc2009-09-14 12:22:28 +000032int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
David S. Millerf9242b62012-06-19 18:56:21 -070034 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
Eric Dumazete0ad61e2010-10-25 21:02:28 +000035 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
Alexey Dobriyan41135cc2009-09-14 12:22:28 +000039int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
David S. Millerf9242b62012-06-19 18:56:21 -070041 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
David S. Millerf9242b62012-06-19 18:56:21 -070043 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
Eric Dumazete0ad61e2010-10-25 21:02:28 +000044 prot, NULL) == prot) ? 0 : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46 synchronize_net();
47
48 return ret;
49}
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +090050EXPORT_SYMBOL(inet6_del_protocol);
Vlad Yasevichc6b641a2012-11-15 08:49:22 +000051#endif
52
53const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
54
55int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
56{
57 return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
58 NULL, prot) ? 0 : -1;
59}
60EXPORT_SYMBOL(inet6_add_offload);
Vlad Yasevich8ca896c2012-11-15 08:49:13 +000061
62int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
63{
64 int ret;
65
66 ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
67 prot, NULL) == prot) ? 0 : -1;
68
69 synchronize_net();
70
71 return ret;
72}
73EXPORT_SYMBOL(inet6_del_offload);