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 | * | |
| 8 | * Version: $Id: protocol.c,v 1.14 2001/05/18 02:25:49 davem Exp $ | |
| 9 | * | |
| 02c30a84 | 10 | * Authors: Ross Biro |
| 1da177e4 LT |
11 | * Fred N. van Kempen, <[email protected]> |
| 12 | * | |
| 13 | * Fixes: | |
| 14 | * Alan Cox : Ahah! udp icmp errors don't work because | |
| 15 | * udp_err is never called! | |
| 16 | * Alan Cox : Added new fields for init and ready for | |
| 17 | * proper fragmentation (_NO_ 4K limits!) | |
| 18 | * Richard Colella : Hang on hash collision | |
| 19 | * Vince Laviano : Modified inet_del_protocol() to correctly | |
| 20 | * maintain copy bit. | |
| 21 | * | |
| 22 | * This program is free software; you can redistribute it and/or | |
| 23 | * modify it under the terms of the GNU General Public License | |
| 24 | * as published by the Free Software Foundation; either version | |
| 25 | * 2 of the License, or (at your option) any later version. | |
| 26 | */ | |
| 27 | ||
| 28 | #include <asm/uaccess.h> | |
| 29 | #include <asm/system.h> | |
| 30 | #include <linux/module.h> | |
| 31 | #include <linux/types.h> | |
| 32 | #include <linux/kernel.h> | |
| 33 | #include <linux/sched.h> | |
| 34 | #include <linux/string.h> | |
| 35 | #include <linux/config.h> | |
| 36 | #include <linux/socket.h> | |
| 37 | #include <linux/in.h> | |
| 38 | #include <linux/inet.h> | |
| 39 | #include <linux/netdevice.h> | |
| 40 | #include <linux/timer.h> | |
| 41 | #include <net/ip.h> | |
| 42 | #include <net/protocol.h> | |
| 1da177e4 LT |
43 | #include <linux/skbuff.h> |
| 44 | #include <net/sock.h> | |
| 45 | #include <net/icmp.h> | |
| 46 | #include <net/udp.h> | |
| 47 | #include <net/ipip.h> | |
| 48 | #include <linux/igmp.h> | |
| 49 | ||
| 50 | struct net_protocol *inet_protos[MAX_INET_PROTOS]; | |
| 51 | static DEFINE_SPINLOCK(inet_proto_lock); | |
| 52 | ||
| 53 | /* | |
| 54 | * Add a protocol handler to the hash tables | |
| 55 | */ | |
| 56 | ||
| 57 | int inet_add_protocol(struct net_protocol *prot, unsigned char protocol) | |
| 58 | { | |
| 59 | int hash, ret; | |
| 60 | ||
| 61 | hash = protocol & (MAX_INET_PROTOS - 1); | |
| 62 | ||
| 63 | spin_lock_bh(&inet_proto_lock); | |
| 64 | if (inet_protos[hash]) { | |
| 65 | ret = -1; | |
| 66 | } else { | |
| 67 | inet_protos[hash] = prot; | |
| 68 | ret = 0; | |
| 69 | } | |
| 70 | spin_unlock_bh(&inet_proto_lock); | |
| 71 | ||
| 72 | return ret; | |
| 73 | } | |
| 74 | ||
| 75 | /* | |
| 76 | * Remove a protocol from the hash tables. | |
| 77 | */ | |
| 78 | ||
| 79 | int inet_del_protocol(struct net_protocol *prot, unsigned char protocol) | |
| 80 | { | |
| 81 | int hash, ret; | |
| 82 | ||
| 83 | hash = protocol & (MAX_INET_PROTOS - 1); | |
| 84 | ||
| 85 | spin_lock_bh(&inet_proto_lock); | |
| 86 | if (inet_protos[hash] == prot) { | |
| 87 | inet_protos[hash] = NULL; | |
| 88 | ret = 0; | |
| 89 | } else { | |
| 90 | ret = -1; | |
| 91 | } | |
| 92 | spin_unlock_bh(&inet_proto_lock); | |
| 93 | ||
| 94 | synchronize_net(); | |
| 95 | ||
| 96 | return ret; | |
| 97 | } | |
| 98 | ||
| 99 | EXPORT_SYMBOL(inet_add_protocol); | |
| 100 | EXPORT_SYMBOL(inet_del_protocol); |