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 __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly; 29 30 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol) 31 { 32 int hash = protocol & (MAX_INET_PROTOS - 1); 33 34 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[hash], 35 NULL, prot) ? 0 : -1; 36 } 37 EXPORT_SYMBOL(inet6_add_protocol); 38 39 /* 40 * Remove a protocol from the hash tables. 41 */ 42 43 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol) 44 { 45 int ret, hash = protocol & (MAX_INET_PROTOS - 1); 46 47 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[hash], 48 prot, NULL) == prot) ? 0 : -1; 49 50 synchronize_net(); 51 52 return ret; 53 } 54 EXPORT_SYMBOL(inet6_del_protocol); 55