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 * Authors: Pedro Roque <roque@di.fc.ul.pt> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 /* 17 * Changes: 18 * 19 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001 20 * - Removed unused variable 'inet6_protocol_base' 21 * - Modified inet6_del_protocol() to correctly maintain copy bit. 22 */ 23 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 33 #include <net/sock.h> 34 #include <net/snmp.h> 35 36 #include <net/ipv6.h> 37 #include <net/protocol.h> 38 39 struct inet6_protocol *inet6_protos[MAX_INET_PROTOS]; 40 static DEFINE_SPINLOCK(inet6_proto_lock); 41 42 43 int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol) 44 { 45 int ret, hash = protocol & (MAX_INET_PROTOS - 1); 46 47 spin_lock_bh(&inet6_proto_lock); 48 49 if (inet6_protos[hash]) { 50 ret = -1; 51 } else { 52 inet6_protos[hash] = prot; 53 ret = 0; 54 } 55 56 spin_unlock_bh(&inet6_proto_lock); 57 58 return ret; 59 } 60 61 EXPORT_SYMBOL(inet6_add_protocol); 62 63 /* 64 * Remove a protocol from the hash tables. 65 */ 66 67 int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol) 68 { 69 int ret, hash = protocol & (MAX_INET_PROTOS - 1); 70 71 spin_lock_bh(&inet6_proto_lock); 72 73 if (inet6_protos[hash] != prot) { 74 ret = -1; 75 } else { 76 inet6_protos[hash] = NULL; 77 ret = 0; 78 } 79 80 spin_unlock_bh(&inet6_proto_lock); 81 82 synchronize_net(); 83 84 return ret; 85 } 86 87 EXPORT_SYMBOL(inet6_del_protocol); 88