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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
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 | * | |
02c30a84 | 9 | * Authors: Ross Biro |
1da177e4 LT |
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. | |
1da177e4 | 20 | */ |
fa1a9c68 | 21 | #include <linux/cache.h> |
1da177e4 | 22 | #include <linux/module.h> |
1da177e4 | 23 | #include <linux/netdevice.h> |
fa1a9c68 | 24 | #include <linux/spinlock.h> |
1da177e4 | 25 | #include <net/protocol.h> |
1da177e4 | 26 | |
dddb64bc | 27 | struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly; |
b8a51b38 | 28 | EXPORT_SYMBOL(inet_protos); |
de27d001 | 29 | const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly; |
ce3e0286 | 30 | EXPORT_SYMBOL(inet_offloads); |
1da177e4 | 31 | |
32613090 | 32 | int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol) |
1da177e4 | 33 | { |
547472b8 DM |
34 | if (!prot->netns_ok) { |
35 | pr_err("Protocol %u is not namespace aware, cannot register.\n", | |
36 | protocol); | |
37 | return -EINVAL; | |
38 | } | |
39 | ||
f9242b6b | 40 | return !cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
e0ad61ec | 41 | NULL, prot) ? 0 : -1; |
1da177e4 | 42 | } |
4bc2f18b | 43 | EXPORT_SYMBOL(inet_add_protocol); |
1da177e4 | 44 | |
de27d001 VY |
45 | int inet_add_offload(const struct net_offload *prot, unsigned char protocol) |
46 | { | |
47 | return !cmpxchg((const struct net_offload **)&inet_offloads[protocol], | |
48 | NULL, prot) ? 0 : -1; | |
49 | } | |
50 | EXPORT_SYMBOL(inet_add_offload); | |
51 | ||
32613090 | 52 | int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol) |
1da177e4 | 53 | { |
f9242b6b | 54 | int ret; |
1da177e4 | 55 | |
f9242b6b | 56 | ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol], |
e0ad61ec | 57 | prot, NULL) == prot) ? 0 : -1; |
1da177e4 LT |
58 | |
59 | synchronize_net(); | |
60 | ||
61 | return ret; | |
62 | } | |
1da177e4 | 63 | EXPORT_SYMBOL(inet_del_protocol); |
de27d001 VY |
64 | |
65 | int inet_del_offload(const struct net_offload *prot, unsigned char protocol) | |
66 | { | |
67 | int ret; | |
68 | ||
69 | ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol], | |
70 | prot, NULL) == prot) ? 0 : -1; | |
71 | ||
72 | synchronize_net(); | |
73 | ||
74 | return ret; | |
75 | } | |
76 | EXPORT_SYMBOL(inet_del_offload); |