| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * INET protocol dispatch tables. |
| * |
| * Version: $Id: protocol.c,v 1.14 2001/05/18 02:25:49 davem Exp $ |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * Fixes: |
| * Alan Cox : Ahah! udp icmp errors don't work because |
| * udp_err is never called! |
| * Alan Cox : Added new fields for init and ready for |
| * proper fragmentation (_NO_ 4K limits!) |
| * Richard Colella : Hang on hash collision |
| * Vince Laviano : Modified inet_del_protocol() to correctly |
| * maintain copy bit. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/config.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/timer.h> |
| #include <net/ip.h> |
| #include <net/protocol.h> |
| #include <linux/skbuff.h> |
| #include <net/sock.h> |
| #include <net/icmp.h> |
| #include <net/udp.h> |
| #include <net/ipip.h> |
| #include <linux/igmp.h> |
| |
| struct net_protocol *inet_protos[MAX_INET_PROTOS]; |
| static DEFINE_SPINLOCK(inet_proto_lock); |
| |
| /* |
| * Add a protocol handler to the hash tables |
| */ |
| |
| int inet_add_protocol(struct net_protocol *prot, unsigned char protocol) |
| { |
| int hash, ret; |
| |
| hash = protocol & (MAX_INET_PROTOS - 1); |
| |
| spin_lock_bh(&inet_proto_lock); |
| if (inet_protos[hash]) { |
| ret = -1; |
| } else { |
| inet_protos[hash] = prot; |
| ret = 0; |
| } |
| spin_unlock_bh(&inet_proto_lock); |
| |
| return ret; |
| } |
| |
| /* |
| * Remove a protocol from the hash tables. |
| */ |
| |
| int inet_del_protocol(struct net_protocol *prot, unsigned char protocol) |
| { |
| int hash, ret; |
| |
| hash = protocol & (MAX_INET_PROTOS - 1); |
| |
| spin_lock_bh(&inet_proto_lock); |
| if (inet_protos[hash] == prot) { |
| inet_protos[hash] = NULL; |
| ret = 0; |
| } else { |
| ret = -1; |
| } |
| spin_unlock_bh(&inet_proto_lock); |
| |
| synchronize_net(); |
| |
| return ret; |
| } |
| |
| EXPORT_SYMBOL(inet_add_protocol); |
| EXPORT_SYMBOL(inet_del_protocol); |