1*2874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX
41da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket
51da177e4SLinus Torvalds * interface as the means of communication with the user level.
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * INET protocol dispatch tables.
81da177e4SLinus Torvalds *
902c30a84SJesper Juhl * Authors: Ross Biro
101da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
111da177e4SLinus Torvalds *
121da177e4SLinus Torvalds * Fixes:
131da177e4SLinus Torvalds * Alan Cox : Ahah! udp icmp errors don't work because
141da177e4SLinus Torvalds * udp_err is never called!
151da177e4SLinus Torvalds * Alan Cox : Added new fields for init and ready for
161da177e4SLinus Torvalds * proper fragmentation (_NO_ 4K limits!)
171da177e4SLinus Torvalds * Richard Colella : Hang on hash collision
181da177e4SLinus Torvalds * Vince Laviano : Modified inet_del_protocol() to correctly
191da177e4SLinus Torvalds * maintain copy bit.
201da177e4SLinus Torvalds */
21fa1a9c68SAlexey Dobriyan #include <linux/cache.h>
221da177e4SLinus Torvalds #include <linux/module.h>
231da177e4SLinus Torvalds #include <linux/netdevice.h>
24fa1a9c68SAlexey Dobriyan #include <linux/spinlock.h>
251da177e4SLinus Torvalds #include <net/protocol.h>
261da177e4SLinus Torvalds
27dddb64bcSsubashab@codeaurora.org struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
28b8a51b38SStefano Brivio EXPORT_SYMBOL(inet_protos);
29de27d001SVlad Yasevich const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
30ce3e0286STom Herbert EXPORT_SYMBOL(inet_offloads);
311da177e4SLinus Torvalds
inet_add_protocol(const struct net_protocol * prot,unsigned char protocol)3232613090SAlexey Dobriyan int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
331da177e4SLinus Torvalds {
34f9242b6bSDavid S. Miller return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
35e0ad61ecSEric Dumazet NULL, prot) ? 0 : -1;
361da177e4SLinus Torvalds }
374bc2f18bSEric Dumazet EXPORT_SYMBOL(inet_add_protocol);
381da177e4SLinus Torvalds
inet_add_offload(const struct net_offload * prot,unsigned char protocol)39de27d001SVlad Yasevich int inet_add_offload(const struct net_offload *prot, unsigned char protocol)
40de27d001SVlad Yasevich {
41de27d001SVlad Yasevich return !cmpxchg((const struct net_offload **)&inet_offloads[protocol],
42de27d001SVlad Yasevich NULL, prot) ? 0 : -1;
43de27d001SVlad Yasevich }
44de27d001SVlad Yasevich EXPORT_SYMBOL(inet_add_offload);
45de27d001SVlad Yasevich
inet_del_protocol(const struct net_protocol * prot,unsigned char protocol)4632613090SAlexey Dobriyan int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
471da177e4SLinus Torvalds {
48f9242b6bSDavid S. Miller int ret;
491da177e4SLinus Torvalds
50f9242b6bSDavid S. Miller ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol],
51e0ad61ecSEric Dumazet prot, NULL) == prot) ? 0 : -1;
521da177e4SLinus Torvalds
531da177e4SLinus Torvalds synchronize_net();
541da177e4SLinus Torvalds
551da177e4SLinus Torvalds return ret;
561da177e4SLinus Torvalds }
571da177e4SLinus Torvalds EXPORT_SYMBOL(inet_del_protocol);
58de27d001SVlad Yasevich
inet_del_offload(const struct net_offload * prot,unsigned char protocol)59de27d001SVlad Yasevich int inet_del_offload(const struct net_offload *prot, unsigned char protocol)
60de27d001SVlad Yasevich {
61de27d001SVlad Yasevich int ret;
62de27d001SVlad Yasevich
63de27d001SVlad Yasevich ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol],
64de27d001SVlad Yasevich prot, NULL) == prot) ? 0 : -1;
65de27d001SVlad Yasevich
66de27d001SVlad Yasevich synchronize_net();
67de27d001SVlad Yasevich
68de27d001SVlad Yasevich return ret;
69de27d001SVlad Yasevich }
70de27d001SVlad Yasevich EXPORT_SYMBOL(inet_del_offload);
71