1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Based on net/ipv6/protocol.c
4 * Authors: Pedro Roque <roque@di.fc.ul.pt>
5 *
6 * Changes:
7 *
8 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
9 * - Removed unused variable 'inet6_protocol_base'
10 * - Modified inet6_del_protocol() to correctly maintain copy bit.
11 *
12 * NewIP INET An implementation of the TCP/IP protocol suite for the LINUX
13 * operating system. NewIP INET is implemented using the BSD Socket
14 * interface as the means of communication with the user level.
15 *
16 * NewIP INET protocol dispatch tables.
17 */
18 #define pr_fmt(fmt) KBUILD_MODNAME ": [%s:%d] " fmt, __func__, __LINE__
19
20 #include <net/protocol.h>
21 #include <linux/module.h>
22 #include <linux/netdevice.h>
23 #include <linux/spinlock.h>
24 #include "tcp_nip_parameter.h"
25
26 const struct ninet_protocol __rcu *ninet_protos[MAX_INET_PROTOS] __read_mostly;
27
ninet_add_protocol(const struct ninet_protocol * prot,unsigned char protocol)28 int ninet_add_protocol(const struct ninet_protocol *prot,
29 unsigned char protocol)
30 {
31 return !cmpxchg((const struct ninet_protocol **)&ninet_protos[protocol],
32 NULL, prot) ? 0 : -1;
33 }
34
ninet_del_protocol(const struct ninet_protocol * prot,unsigned char protocol)35 int ninet_del_protocol(const struct ninet_protocol *prot,
36 unsigned char protocol)
37 {
38 int ret;
39
40 ret = (cmpxchg((const struct ninet_protocol **)&ninet_protos[protocol],
41 prot, NULL) == prot) ? 0 : -1;
42
43 synchronize_net();
44
45 return ret;
46 }
47
48