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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the protocol dispatcher.
7 *
8 * Version: @(#)protocol.h 1.0.2 05/07/93
9 *
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.
16 *
17 * Changes:
18 * Alan Cox : Added a name field and a frag handler
19 * field for later.
20 * Alan Cox : Cleaned up, and sorted types.
21 * Pedro Roque : inet6 protocols
22 */
23
24#ifndef _PROTOCOL_H
25#define _PROTOCOL_H
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/in6.h>
Vlad Yasevichc6b641a2012-11-15 08:49:22 +000028#include <linux/skbuff.h>
Eric Dumazetdfd56b82011-12-10 09:48:31 +000029#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/ipv6.h>
31#endif
Vlad Yasevichf191a1d2012-11-15 08:49:23 +000032#include <linux/netdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
David S. Millerf9242b62012-06-19 18:56:21 -070034/* This is one larger than the largest protocol value that can be
35 * found in an ipv4 or ipv6 header. Since in both cases the protocol
36 * value is presented in a __u8, this is defined to be 256.
37 */
38#define MAX_INET_PROTOS 256
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40/* This is used to register protocols. */
41struct net_protocol {
Paolo Abeni74874492017-09-28 15:51:36 +020042 int (*early_demux)(struct sk_buff *skb);
43 int (*early_demux_handler)(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 int (*handler)(struct sk_buff *skb);
45 void (*err_handler)(struct sk_buff *skb, u32 info);
Denis V. Lunevf1450492008-03-24 15:33:00 -070046 unsigned int no_policy:1,
Hannes Frederic Sowa8ed1dc42014-01-09 10:01:17 +010047 netns_ok:1,
48 /* does the protocol do more stringent
49 * icmp tag validation than simple
50 * socket lookup?
51 */
52 icmp_strict_tag_validation:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053};
54
Eric Dumazetdfd56b82011-12-10 09:48:31 +000055#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000056struct inet6_protocol {
Eric Dumazetc7109982012-07-26 12:18:11 +000057 void (*early_demux)(struct sk_buff *skb);
subashab@codeaurora.orgdddb64b2017-03-23 13:34:16 -060058 void (*early_demux_handler)(struct sk_buff *skb);
Herbert Xue5bbef22007-10-15 12:50:28 -070059 int (*handler)(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 void (*err_handler)(struct sk_buff *skb,
62 struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070063 u8 type, u8 code, int offset,
Al Viro04ce6902006-11-08 00:21:01 -080064 __be32 info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 unsigned int flags; /* INET6_PROTO_xxx */
66};
67
68#define INET6_PROTO_NOPOLICY 0x1
69#define INET6_PROTO_FINAL 0x2
70#endif
71
Vlad Yasevichde27d002012-11-15 08:49:12 +000072struct net_offload {
Vlad Yasevichf191a1d2012-11-15 08:49:23 +000073 struct offload_callbacks callbacks;
74 unsigned int flags; /* Flags used by IPv6 for now */
Vlad Yasevichde27d002012-11-15 08:49:12 +000075};
Vlad Yasevichc6b641a2012-11-15 08:49:22 +000076/* This should be set for any extension header which is compatible with GSO. */
77#define INET6_PROTO_GSO_EXTHDR 0x1
Vlad Yasevichde27d002012-11-15 08:49:12 +000078
Linus Torvalds1da177e2005-04-16 15:20:36 -070079/* This is used to register socket interfaces for IP protocols. */
80struct inet_protosw {
81 struct list_head list;
82
83 /* These two fields form the lookup key. */
84 unsigned short type; /* This is the 2nd argument to socket(2). */
Arnaldo Carvalho de Meloee41e2d2006-11-28 03:11:33 -020085 unsigned short protocol; /* This is the L4 protocol number. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87 struct proto *prot;
Eric Dumazet90ddc4f2005-12-22 12:49:22 -080088 const struct proto_ops *ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 unsigned char flags; /* See INET_PROTOSW_* below. */
91};
92#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
93#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080094#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
subashab@codeaurora.orgdddb64b2017-03-23 13:34:16 -060096extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
Vlad Yasevichde27d002012-11-15 08:49:12 +000097extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
Vlad Yasevichc6b641a2012-11-15 08:49:22 +000098extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000100#if IS_ENABLED(CONFIG_IPV6)
subashab@codeaurora.orgdddb64b2017-03-23 13:34:16 -0600101extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#endif
103
Joe Perchesf307c632013-09-22 10:32:17 -0700104int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
105int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
106int inet_add_offload(const struct net_offload *prot, unsigned char num);
107int inet_del_offload(const struct net_offload *prot, unsigned char num);
108void inet_register_protosw(struct inet_protosw *p);
109void inet_unregister_protosw(struct inet_protosw *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000111#if IS_ENABLED(CONFIG_IPV6)
Joe Perchesf307c632013-09-22 10:32:17 -0700112int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
113int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
114int inet6_register_protosw(struct inet_protosw *p);
115void inet6_unregister_protosw(struct inet_protosw *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116#endif
Joe Perchesf307c632013-09-22 10:32:17 -0700117int inet6_add_offload(const struct net_offload *prot, unsigned char num);
118int inet6_del_offload(const struct net_offload *prot, unsigned char num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120#endif /* _PROTOCOL_H */