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 | * INET protocol dispatch tables. |
8 | * |
9 | * Authors: Ross Biro |
10 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
11 | * |
12 | * Fixes: |
13 | * Alan Cox : Ahah! udp icmp errors don't work because |
14 | * udp_err is never called! |
15 | * Alan Cox : Added new fields for init and ready for |
16 | * proper fragmentation (_NO_ 4K limits!) |
17 | * Richard Colella : Hang on hash collision |
18 | * Vince Laviano : Modified inet_del_protocol() to correctly |
19 | * maintain copy bit. |
20 | */ |
21 | #include <linux/cache.h> |
22 | #include <linux/module.h> |
23 | #include <linux/netdevice.h> |
24 | #include <linux/spinlock.h> |
25 | #include <net/protocol.h> |
26 | |
27 | struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly; |
28 | EXPORT_SYMBOL(inet_protos); |
29 | const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly; |
30 | EXPORT_SYMBOL(inet_offloads); |
31 | |
32 | int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol) |
33 | { |
34 | return !cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
35 | NULL, prot) ? 0 : -1; |
36 | } |
37 | EXPORT_SYMBOL(inet_add_protocol); |
38 | |
39 | int inet_add_offload(const struct net_offload *prot, unsigned char protocol) |
40 | { |
41 | return !cmpxchg((const struct net_offload **)&inet_offloads[protocol], |
42 | NULL, prot) ? 0 : -1; |
43 | } |
44 | EXPORT_SYMBOL(inet_add_offload); |
45 | |
46 | int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol) |
47 | { |
48 | int ret; |
49 | |
50 | ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
51 | prot, NULL) == prot) ? 0 : -1; |
52 | |
53 | synchronize_net(); |
54 | |
55 | return ret; |
56 | } |
57 | EXPORT_SYMBOL(inet_del_protocol); |
58 | |
59 | int inet_del_offload(const struct net_offload *prot, unsigned char protocol) |
60 | { |
61 | int ret; |
62 | |
63 | ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol], |
64 | prot, NULL) == prot) ? 0 : -1; |
65 | |
66 | synchronize_net(); |
67 | |
68 | return ret; |
69 | } |
70 | EXPORT_SYMBOL(inet_del_offload); |
71 | |