Commit | Line | Data |
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1da177e4 LT |
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 | * INET protocol dispatch tables. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * | |
11 | * Fixes: | |
12 | * Alan Cox : Ahah! udp icmp errors don't work because | |
13 | * udp_err is never called! | |
14 | * Alan Cox : Added new fields for init and ready for | |
15 | * proper fragmentation (_NO_ 4K limits!) | |
16 | * Richard Colella : Hang on hash collision | |
17 | * Vince Laviano : Modified inet_del_protocol() to correctly | |
18 | * maintain copy bit. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
fa1a9c68 | 25 | #include <linux/cache.h> |
1da177e4 | 26 | #include <linux/module.h> |
1da177e4 | 27 | #include <linux/netdevice.h> |
fa1a9c68 | 28 | #include <linux/spinlock.h> |
1da177e4 | 29 | #include <net/protocol.h> |
1da177e4 | 30 | |
e0ad61ec | 31 | const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly; |
de27d001 | 32 | const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly; |
1da177e4 LT |
33 | |
34 | /* | |
35 | * Add a protocol handler to the hash tables | |
36 | */ | |
37 | ||
32613090 | 38 | int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol) |
1da177e4 | 39 | { |
547472b8 DM |
40 | if (!prot->netns_ok) { |
41 | pr_err("Protocol %u is not namespace aware, cannot register.\n", | |
42 | protocol); | |
43 | return -EINVAL; | |
44 | } | |
45 | ||
f9242b6b | 46 | return !cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
e0ad61ec | 47 | NULL, prot) ? 0 : -1; |
1da177e4 | 48 | } |
4bc2f18b | 49 | EXPORT_SYMBOL(inet_add_protocol); |
1da177e4 | 50 | |
de27d001 VY |
51 | int inet_add_offload(const struct net_offload *prot, unsigned char protocol) |
52 | { | |
53 | return !cmpxchg((const struct net_offload **)&inet_offloads[protocol], | |
54 | NULL, prot) ? 0 : -1; | |
55 | } | |
56 | EXPORT_SYMBOL(inet_add_offload); | |
57 | ||
1da177e4 LT |
58 | /* |
59 | * Remove a protocol from the hash tables. | |
60 | */ | |
e905a9ed | 61 | |
32613090 | 62 | int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol) |
1da177e4 | 63 | { |
f9242b6b | 64 | int ret; |
1da177e4 | 65 | |
f9242b6b | 66 | ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
e0ad61ec | 67 | prot, NULL) == prot) ? 0 : -1; |
1da177e4 LT |
68 | |
69 | synchronize_net(); | |
70 | ||
71 | return ret; | |
72 | } | |
1da177e4 | 73 | EXPORT_SYMBOL(inet_del_protocol); |
de27d001 VY |
74 | |
75 | int inet_del_offload(const struct net_offload *prot, unsigned char protocol) | |
76 | { | |
77 | int ret; | |
78 | ||
79 | ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol], | |
80 | prot, NULL) == prot) ? 0 : -1; | |
81 | ||
82 | synchronize_net(); | |
83 | ||
84 | return ret; | |
85 | } | |
86 | EXPORT_SYMBOL(inet_del_offload); |