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 #if IS_ENABLED(CONFIG_IPV6) 29 struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly; 30 EXPORT_SYMBOL(inet6_protos); 31 32 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol) 33 { 34 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol], 35 NULL, prot) ? 0 : -1; 36 } 37 EXPORT_SYMBOL(inet6_add_protocol); 38 39 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol) 40 { 41 int ret; 42 43 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol], 44 prot, NULL) == prot) ? 0 : -1; 45 46 synchronize_net(); 47 48 return ret; 49 } 50 EXPORT_SYMBOL(inet6_del_protocol); 51 #endif 52 53 const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly; 54 EXPORT_SYMBOL(inet6_offloads); 55 56 int inet6_add_offload(const struct net_offload *prot, unsigned char protocol) 57 { 58 return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol], 59 NULL, prot) ? 0 : -1; 60 } 61 EXPORT_SYMBOL(inet6_add_offload); 62 63 int inet6_del_offload(const struct net_offload *prot, unsigned char protocol) 64 { 65 int ret; 66 67 ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol], 68 prot, NULL) == prot) ? 0 : -1; 69 70 synchronize_net(); 71 72 return ret; 73 } 74 EXPORT_SYMBOL(inet6_del_offload); 75