1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * PF_INET6 protocol dispatch tables.
8 *
9 * Authors: Pedro Roque <roque@di.fc.ul.pt>
10 */
11
12 /*
13 * Changes:
14 *
15 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
16 * - Removed unused variable 'inet6_protocol_base'
17 * - Modified inet6_del_protocol() to correctly maintain copy bit.
18 */
19 #include <linux/module.h>
20 #include <linux/netdevice.h>
21 #include <linux/spinlock.h>
22 #include <net/protocol.h>
23
24 #if IS_ENABLED(CONFIG_IPV6)
25 struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
26 EXPORT_SYMBOL(inet6_protos);
27
inet6_add_protocol(const struct inet6_protocol * prot,unsigned char protocol)28 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
29 {
30 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
31 NULL, prot) ? 0 : -1;
32 }
33 EXPORT_SYMBOL(inet6_add_protocol);
34
inet6_del_protocol(const struct inet6_protocol * prot,unsigned char protocol)35 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
36 {
37 int ret;
38
39 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
40 prot, NULL) == prot) ? 0 : -1;
41
42 synchronize_net();
43
44 return ret;
45 }
46 EXPORT_SYMBOL(inet6_del_protocol);
47 #endif
48
49 const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
50 EXPORT_SYMBOL(inet6_offloads);
51
inet6_add_offload(const struct net_offload * prot,unsigned char protocol)52 int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
53 {
54 return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
55 NULL, prot) ? 0 : -1;
56 }
57 EXPORT_SYMBOL(inet6_add_offload);
58
inet6_del_offload(const struct net_offload * prot,unsigned char protocol)59 int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
60 {
61 int ret;
62
63 ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
64 prot, NULL) == prot) ? 0 : -1;
65
66 synchronize_net();
67
68 return ret;
69 }
70 EXPORT_SYMBOL(inet6_del_offload);
71