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 | |
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 | |
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 | |
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 | |
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 | |