1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * INET An implementation of the TCP/I 2 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is imp 3 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of comm 4 * interface as the means of communication with the user level.
6 * 5 *
7 * PF_INET6 protocol dispatch tab 6 * PF_INET6 protocol dispatch tables.
8 * 7 *
>> 8 * Version: $Id: protocol.c,v 1.10 2001/05/18 02:25:49 davem Exp $
>> 9 *
9 * Authors: Pedro Roque <roque@di.fc.u 10 * Authors: Pedro Roque <roque@di.fc.ul.pt>
>> 11 *
>> 12 * This program is free software; you can redistribute it and/or
>> 13 * modify it under the terms of the GNU General Public License
>> 14 * as published by the Free Software Foundation; either version
>> 15 * 2 of the License, or (at your option) any later version.
10 */ 16 */
11 17
12 /* 18 /*
13 * Changes: 19 * Changes:
14 * 20 *
15 * Vince Laviano (vince@cs.stanford.edu) 21 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
16 * - Removed unused variable 'inet6_proto 22 * - Removed unused variable 'inet6_protocol_base'
17 * - Modified inet6_del_protocol() to cor 23 * - Modified inet6_del_protocol() to correctly maintain copy bit.
18 */ 24 */
19 #include <linux/module.h> !! 25
>> 26 #include <linux/errno.h>
>> 27 #include <linux/types.h>
>> 28 #include <linux/socket.h>
>> 29 #include <linux/sockios.h>
>> 30 #include <linux/sched.h>
>> 31 #include <linux/net.h>
>> 32 #include <linux/in6.h>
20 #include <linux/netdevice.h> 33 #include <linux/netdevice.h>
21 #include <linux/spinlock.h> !! 34 #include <linux/if_arp.h>
>> 35
>> 36 #include <net/sock.h>
>> 37 #include <net/snmp.h>
>> 38
>> 39 #include <net/ipv6.h>
22 #include <net/protocol.h> 40 #include <net/protocol.h>
23 41
24 #if IS_ENABLED(CONFIG_IPV6) !! 42 struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
25 struct inet6_protocol __rcu *inet6_protos[MAX_ !! 43 static spinlock_t inet6_proto_lock = SPIN_LOCK_UNLOCKED;
26 EXPORT_SYMBOL(inet6_protos); <<
27 44
28 int inet6_add_protocol(const struct inet6_prot <<
29 { <<
30 return !cmpxchg((const struct inet6_pr <<
31 NULL, prot) ? 0 : -1; <<
32 } <<
33 EXPORT_SYMBOL(inet6_add_protocol); <<
34 45
35 int inet6_del_protocol(const struct inet6_prot !! 46 int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
36 { 47 {
37 int ret; !! 48 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
38 49
39 ret = (cmpxchg((const struct inet6_pro !! 50 spin_lock_bh(&inet6_proto_lock);
40 prot, NULL) == prot) ? <<
41 51
42 synchronize_net(); !! 52 if (inet6_protos[hash]) {
>> 53 ret = -1;
>> 54 } else {
>> 55 inet6_protos[hash] = prot;
>> 56 ret = 0;
>> 57 }
>> 58
>> 59 spin_unlock_bh(&inet6_proto_lock);
43 60
44 return ret; 61 return ret;
45 } 62 }
46 EXPORT_SYMBOL(inet6_del_protocol); <<
47 #endif <<
48 <<
49 const struct net_offload __rcu *inet6_offloads <<
50 EXPORT_SYMBOL(inet6_offloads); <<
51 63
52 int inet6_add_offload(const struct net_offload !! 64 /*
>> 65 * Remove a protocol from the hash tables.
>> 66 */
>> 67
>> 68 int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
53 { 69 {
54 return !cmpxchg((const struct net_offl !! 70 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
55 NULL, prot) ? 0 : -1; <<
56 } <<
57 EXPORT_SYMBOL(inet6_add_offload); <<
58 71
59 int inet6_del_offload(const struct net_offload !! 72 spin_lock_bh(&inet6_proto_lock);
60 { !! 73
61 int ret; !! 74 if (inet6_protos[hash] != prot) {
>> 75 ret = -1;
>> 76 } else {
>> 77 inet6_protos[hash] = NULL;
>> 78 ret = 0;
>> 79 }
62 80
63 ret = (cmpxchg((const struct net_offlo !! 81 spin_unlock_bh(&inet6_proto_lock);
64 prot, NULL) == prot) ? <<
65 82
66 synchronize_net(); 83 synchronize_net();
67 84
68 return ret; 85 return ret;
69 } 86 }
70 EXPORT_SYMBOL(inet6_del_offload); <<
71 87
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