1 // SPDX-License-Identifier: GPL-2.0-or-later
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.
7 * INET protocol dispatch tables.
10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 * Alan Cox : Ahah! udp icmp errors don't work because
14 * udp_err is never called!
15 * Alan Cox : Added new fields for init and ready for
16 * proper fragmentation (_NO_ 4K limits!)
17 * Richard Colella : Hang on hash collision
18 * Vince Laviano : Modified inet_del_protocol() to correctly
21 #include <linux/cache.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/spinlock.h>
25 #include <net/protocol.h>
27 struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
28 EXPORT_SYMBOL(inet_protos);
29 const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
30 EXPORT_SYMBOL(inet_offloads);
32 int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
34 return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
37 EXPORT_SYMBOL(inet_add_protocol);
39 int inet_add_offload(const struct net_offload *prot, unsigned char protocol)
41 return !cmpxchg((const struct net_offload **)&inet_offloads[protocol],
44 EXPORT_SYMBOL(inet_add_offload);
46 int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
50 ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol],
51 prot, NULL) == prot) ? 0 : -1;
57 EXPORT_SYMBOL(inet_del_protocol);
59 int inet_del_offload(const struct net_offload *prot, unsigned char protocol)
63 ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol],
64 prot, NULL) == prot) ? 0 : -1;
70 EXPORT_SYMBOL(inet_del_offload);