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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>
Eric Dumazetdfd56b82011-12-10 09:48:31 +000028#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/ipv6.h>
30#endif
31
32#define MAX_INET_PROTOS 256 /* Must be a power of 2 */
33
34
35/* This is used to register protocols. */
36struct net_protocol {
37 int (*handler)(struct sk_buff *skb);
38 void (*err_handler)(struct sk_buff *skb, u32 info);
Herbert Xua430a432006-07-08 13:34:56 -070039 int (*gso_send_check)(struct sk_buff *skb);
Herbert Xu576a30e2006-06-27 13:22:38 -070040 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
Michał Mirosławc8f44af2011-11-15 15:29:55 +000041 netdev_features_t features);
Herbert Xu73cc19f2008-12-15 23:41:09 -080042 struct sk_buff **(*gro_receive)(struct sk_buff **head,
43 struct sk_buff *skb);
44 int (*gro_complete)(struct sk_buff *skb);
Denis V. Lunevf1450492008-03-24 15:33:00 -070045 unsigned int no_policy:1,
46 netns_ok:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047};
48
Eric Dumazetdfd56b82011-12-10 09:48:31 +000049#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000050struct inet6_protocol {
Herbert Xue5bbef22007-10-15 12:50:28 -070051 int (*handler)(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53 void (*err_handler)(struct sk_buff *skb,
54 struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070055 u8 type, u8 code, int offset,
Al Viro04ce6902006-11-08 00:21:01 -080056 __be32 info);
Herbert Xuadcfc7d2006-06-30 13:36:15 -070057
Herbert Xua430a432006-07-08 13:34:56 -070058 int (*gso_send_check)(struct sk_buff *skb);
Herbert Xuadcfc7d2006-06-30 13:36:15 -070059 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
Michał Mirosławc8f44af2011-11-15 15:29:55 +000060 netdev_features_t features);
Herbert Xu787e9202009-01-08 10:40:57 -080061 struct sk_buff **(*gro_receive)(struct sk_buff **head,
62 struct sk_buff *skb);
63 int (*gro_complete)(struct sk_buff *skb);
Herbert Xuadcfc7d2006-06-30 13:36:15 -070064
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
Herbert Xuadcfc7d2006-06-30 13:36:15 -070070/* This should be set for any extension header which is compatible with GSO. */
71#define INET6_PROTO_GSO_EXTHDR 0x4
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#endif
73
74/* This is used to register socket interfaces for IP protocols. */
75struct inet_protosw {
76 struct list_head list;
77
78 /* These two fields form the lookup key. */
79 unsigned short type; /* This is the 2nd argument to socket(2). */
Arnaldo Carvalho de Meloee41e2d2006-11-28 03:11:33 -020080 unsigned short protocol; /* This is the L4 protocol number. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 struct proto *prot;
Eric Dumazet90ddc4f2005-12-22 12:49:22 -080083 const struct proto_ops *ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 char no_check; /* checksum on rcv/xmit/none? */
86 unsigned char flags; /* See INET_PROTOSW_* below. */
87};
88#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
89#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080090#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Eric Dumazete0ad61e2010-10-25 21:02:28 +000092extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Eric Dumazetdfd56b82011-12-10 09:48:31 +000094#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazete0ad61e2010-10-25 21:02:28 +000095extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#endif
97
Alexey Dobriyan32613092009-09-14 12:21:47 +000098extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
99extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100extern void inet_register_protosw(struct inet_protosw *p);
101extern void inet_unregister_protosw(struct inet_protosw *p);
102
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000103#if IS_ENABLED(CONFIG_IPV6)
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000104extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
105extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
Daniel Lezcano87c3efb2007-12-11 02:25:01 -0800106extern int inet6_register_protosw(struct inet_protosw *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107extern void inet6_unregister_protosw(struct inet_protosw *p);
108#endif
109
110#endif /* _PROTOCOL_H */