projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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, <[email protected]> |
| 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 | |
| 32613090 | 31 | const struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp; |
| 1da177e4 LT |
32 | static DEFINE_SPINLOCK(inet_proto_lock); |
| 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 LT |
39 | { |
| 40 | int hash, ret; | |
| 41 | ||
| 42 | hash = protocol & (MAX_INET_PROTOS - 1); | |
| 43 | ||
| 44 | spin_lock_bh(&inet_proto_lock); | |
| 45 | if (inet_protos[hash]) { | |
| 46 | ret = -1; | |
| 47 | } else { | |
| 48 | inet_protos[hash] = prot; | |
| 49 | ret = 0; | |
| 50 | } | |
| 51 | spin_unlock_bh(&inet_proto_lock); | |
| 52 | ||
| 53 | return ret; | |
| 54 | } | |
| 4bc2f18b | 55 | EXPORT_SYMBOL(inet_add_protocol); |
| 1da177e4 LT |
56 | |
| 57 | /* | |
| 58 | * Remove a protocol from the hash tables. | |
| 59 | */ | |
| e905a9ed | 60 | |
| 32613090 | 61 | int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol) |
| 1da177e4 LT |
62 | { |
| 63 | int hash, ret; | |
| 64 | ||
| 65 | hash = protocol & (MAX_INET_PROTOS - 1); | |
| 66 | ||
| 67 | spin_lock_bh(&inet_proto_lock); | |
| 68 | if (inet_protos[hash] == prot) { | |
| 69 | inet_protos[hash] = NULL; | |
| 70 | ret = 0; | |
| 71 | } else { | |
| 72 | ret = -1; | |
| 73 | } | |
| 74 | spin_unlock_bh(&inet_proto_lock); | |
| 75 | ||
| 76 | synchronize_net(); | |
| 77 | ||
| 78 | return ret; | |
| 79 | } | |
| 1da177e4 | 80 | EXPORT_SYMBOL(inet_del_protocol); |