1/*
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
27#include <linux/in6.h>
28#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
29#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);
39	int			(*gso_send_check)(struct sk_buff *skb);
40	struct sk_buff	       *(*gso_segment)(struct sk_buff *skb,
41					       int features);
42#ifdef CONFIG_INET_GRO
43	struct sk_buff	      **(*gro_receive)(struct sk_buff **head,
44					       struct sk_buff *skb);
45	int			(*gro_complete)(struct sk_buff *skb);
46#endif /* CONFIG_INET_GRO */
47	int			no_policy;
48};
49
50#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
51struct inet6_protocol
52{
53	int	(*handler)(struct sk_buff **skb);
54
55	void	(*err_handler)(struct sk_buff *skb,
56			       struct inet6_skb_parm *opt,
57			       int type, int code, int offset,
58			       __be32 info);
59
60	int	(*gso_send_check)(struct sk_buff *skb);
61	struct sk_buff *(*gso_segment)(struct sk_buff *skb,
62				       int features);
63
64	unsigned int	flags;	/* INET6_PROTO_xxx */
65};
66
67#define INET6_PROTO_NOPOLICY	0x1
68#define INET6_PROTO_FINAL	0x2
69/* This should be set for any extension header which is compatible with GSO. */
70#define INET6_PROTO_GSO_EXTHDR	0x4
71#endif
72
73/* This is used to register socket interfaces for IP protocols.  */
74struct inet_protosw {
75	struct list_head list;
76
77        /* These two fields form the lookup key.  */
78	unsigned short	 type;	   /* This is the 2nd argument to socket(2). */
79	unsigned short	 protocol; /* This is the L4 protocol number.  */
80
81	struct proto	 *prot;
82	const struct proto_ops *ops;
83
84	int              capability; /* Which (if any) capability do
85				      * we need to use this socket
86				      * interface?
87                                      */
88	char             no_check;   /* checksum on rcv/xmit/none? */
89	unsigned char	 flags;      /* See INET_PROTOSW_* below.  */
90};
91#define INET_PROTOSW_REUSE 0x01	     /* Are ports automatically reusable? */
92#define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */
93#define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */
94
95extern struct net_protocol *inet_protocol_base;
96extern struct net_protocol *inet_protos[MAX_INET_PROTOS];
97
98#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
99extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
100#endif
101
102extern int	inet_add_protocol(struct net_protocol *prot, unsigned char num);
103extern int	inet_del_protocol(struct net_protocol *prot, unsigned char num);
104extern void	inet_register_protosw(struct inet_protosw *p);
105extern void	inet_unregister_protosw(struct inet_protosw *p);
106
107#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
108extern int	inet6_add_protocol(struct inet6_protocol *prot, unsigned char num);
109extern int	inet6_del_protocol(struct inet6_protocol *prot, unsigned char num);
110extern void	inet6_register_protosw(struct inet_protosw *p);
111extern void	inet6_unregister_protosw(struct inet_protosw *p);
112#endif
113
114#endif	/* _PROTOCOL_H */
115