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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 | */ | |
25 | ||
26 | #include <asm/uaccess.h> | |
27 | #include <asm/system.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/kernel.h> | |
1da177e4 | 31 | #include <linux/string.h> |
1da177e4 LT |
32 | #include <linux/socket.h> |
33 | #include <linux/in.h> | |
34 | #include <linux/inet.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/timer.h> | |
37 | #include <net/ip.h> | |
38 | #include <net/protocol.h> | |
1da177e4 LT |
39 | #include <linux/skbuff.h> |
40 | #include <net/sock.h> | |
41 | #include <net/icmp.h> | |
42 | #include <net/udp.h> | |
43 | #include <net/ipip.h> | |
44 | #include <linux/igmp.h> | |
45 | ||
03d4f879 | 46 | struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp; |
1da177e4 LT |
47 | static DEFINE_SPINLOCK(inet_proto_lock); |
48 | ||
49 | /* | |
50 | * Add a protocol handler to the hash tables | |
51 | */ | |
52 | ||
53 | int inet_add_protocol(struct net_protocol *prot, unsigned char protocol) | |
54 | { | |
55 | int hash, ret; | |
56 | ||
57 | hash = protocol & (MAX_INET_PROTOS - 1); | |
58 | ||
59 | spin_lock_bh(&inet_proto_lock); | |
60 | if (inet_protos[hash]) { | |
61 | ret = -1; | |
62 | } else { | |
63 | inet_protos[hash] = prot; | |
64 | ret = 0; | |
65 | } | |
66 | spin_unlock_bh(&inet_proto_lock); | |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Remove a protocol from the hash tables. | |
73 | */ | |
e905a9ed | 74 | |
1da177e4 LT |
75 | int inet_del_protocol(struct net_protocol *prot, unsigned char protocol) |
76 | { | |
77 | int hash, ret; | |
78 | ||
79 | hash = protocol & (MAX_INET_PROTOS - 1); | |
80 | ||
81 | spin_lock_bh(&inet_proto_lock); | |
82 | if (inet_protos[hash] == prot) { | |
83 | inet_protos[hash] = NULL; | |
84 | ret = 0; | |
85 | } else { | |
86 | ret = -1; | |
87 | } | |
88 | spin_unlock_bh(&inet_proto_lock); | |
89 | ||
90 | synchronize_net(); | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
95 | EXPORT_SYMBOL(inet_add_protocol); | |
96 | EXPORT_SYMBOL(inet_del_protocol); |