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 #include <linux/module.h> 24 #include <linux/netdevice.h> 25 #include <linux/spinlock.h> 26 #include <net/protocol.h> 27 28 const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS]; 29 static DEFINE_SPINLOCK(inet6_proto_lock); 30 31 32 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol) 33 { 34 int ret, hash = protocol & (MAX_INET_PROTOS - 1); 35 36 spin_lock_bh(&inet6_proto_lock); 37 38 if (inet6_protos[hash]) { 39 ret = -1; 40 } else { 41 inet6_protos[hash] = prot; 42 ret = 0; 43 } 44 45 spin_unlock_bh(&inet6_proto_lock); 46 47 return ret; 48 } 49 50 EXPORT_SYMBOL(inet6_add_protocol); 51 52 /* 53 * Remove a protocol from the hash tables. 54 */ 55 56 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol) 57 { 58 int ret, hash = protocol & (MAX_INET_PROTOS - 1); 59 60 spin_lock_bh(&inet6_proto_lock); 61 62 if (inet6_protos[hash] != prot) { 63 ret = -1; 64 } else { 65 inet6_protos[hash] = NULL; 66 ret = 0; 67 } 68 69 spin_unlock_bh(&inet6_proto_lock); 70 71 synchronize_net(); 72 73 return ret; 74 } 75 76 EXPORT_SYMBOL(inet6_del_protocol); 77