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
28 #if IS_ENABLED(CONFIG_IPV6)
29 struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
30 EXPORT_SYMBOL(inet6_protos);
31
32 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
33 {
34 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
35 NULL, prot) ? 0 : -1;
36 }
37 EXPORT_SYMBOL(inet6_add_protocol);
38
39 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
40 {
41 int ret;
42
43 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
44 prot, NULL) == prot) ? 0 : -1;
45
46 synchronize_net();
47
48 return ret;
49 }
50 EXPORT_SYMBOL(inet6_del_protocol);
51 #endif
52
53 const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
54 EXPORT_SYMBOL(inet6_offloads);
55
56 int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
57 {
58 return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
59 NULL, prot) ? 0 : -1;
60 }
61 EXPORT_SYMBOL(inet6_add_offload);
62
63 int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
64 {
65 int ret;
66
67 ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
68 prot, NULL) == prot) ? 0 : -1;
69
70 synchronize_net();
71
72 return ret;
73 }
74 EXPORT_SYMBOL(inet6_del_offload);
75
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