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 * PF_INET6 protocol dispatch tables. 7 * 8 * Version: $Id: protocol.c,v 1.10 2001/05/18 02:25:49 davem Exp $ 9 * 10 * Authors: Pedro Roque <roque@di.fc.ul.pt> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 18 /* 19 * Changes: 20 * 21 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001 22 * - Removed unused variable 'inet6_protocol_base' 23 * - Modified inet6_del_protocol() to correctly maintain copy bit. 24 */ 25 26 #include <linux/errno.h> 27 #include <linux/types.h> 28 #include <linux/socket.h> 29 #include <linux/sockios.h> 30 #include <linux/sched.h> 31 #include <linux/net.h> 32 #include <linux/in6.h> 33 #include <linux/netdevice.h> 34 #include <linux/if_arp.h> 35 36 #include <net/sock.h> 37 #include <net/snmp.h> 38 39 #include <net/ipv6.h> 40 #include <net/protocol.h> 41 42 struct inet6_protocol *inet6_protos[MAX_INET_PROTOS]; 43 static DEFINE_SPINLOCK(inet6_proto_lock); 44 45 46 int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol) 47 { 48 int ret, hash = protocol & (MAX_INET_PROTOS - 1); 49 50 spin_lock_bh(&inet6_proto_lock); 51 52 if (inet6_protos[hash]) { 53 ret = -1; 54 } else { 55 inet6_protos[hash] = prot; 56 ret = 0; 57 } 58 59 spin_unlock_bh(&inet6_proto_lock); 60 61 return ret; 62 } 63 64 /* 65 * Remove a protocol from the hash tables. 66 */ 67 68 int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol) 69 { 70 int ret, hash = protocol & (MAX_INET_PROTOS - 1); 71 72 spin_lock_bh(&inet6_proto_lock); 73 74 if (inet6_protos[hash] != prot) { 75 ret = -1; 76 } else { 77 inet6_protos[hash] = NULL; 78 ret = 0; 79 } 80 81 spin_unlock_bh(&inet6_proto_lock); 82 83 synchronize_net(); 84 85 return ret; 86 } 87