1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * PF_INET6 protocol dispatch tables. 8 * 9 * Authors: Pedro Roque <roque@di.fc.ul.pt> 10 */ 11 12 /* 13 * Changes: 14 * 15 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001 16 * - Removed unused variable 'inet6_protocol_base' 17 * - Modified inet6_del_protocol() to correctly maintain copy bit. 18 */ 19 #include <linux/module.h> 20 #include <linux/netdevice.h> 21 #include <linux/spinlock.h> 22 #include <net/protocol.h> 23 24 #if IS_ENABLED(CONFIG_IPV6) 25 struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly; 26 EXPORT_SYMBOL(inet6_protos); 27 28 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol) 29 { 30 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol], 31 NULL, prot) ? 0 : -1; 32 } 33 EXPORT_SYMBOL(inet6_add_protocol); 34 35 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol) 36 { 37 int ret; 38 39 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol], 40 prot, NULL) == prot) ? 0 : -1; 41 42 synchronize_net(); 43 44 return ret; 45 } 46 EXPORT_SYMBOL(inet6_del_protocol); 47 #endif 48 49 const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly; 50 EXPORT_SYMBOL(inet6_offloads); 51 52 int inet6_add_offload(const struct net_offload *prot, unsigned char protocol) 53 { 54 return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol], 55 NULL, prot) ? 0 : -1; 56 } 57 EXPORT_SYMBOL(inet6_add_offload); 58 59 int inet6_del_offload(const struct net_offload *prot, unsigned char protocol) 60 { 61 int ret; 62 63 ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol], 64 prot, NULL) == prot) ? 0 : -1; 65 66 synchronize_net(); 67 68 return ret; 69 } 70 EXPORT_SYMBOL(inet6_del_offload); 71