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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 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
40 int features);
41 int no_policy;
42};
43
44#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
45struct inet6_protocol
46{
47 int (*handler)(struct sk_buff **skb);
48
49 void (*err_handler)(struct sk_buff *skb,
50 struct inet6_skb_parm *opt,
51 int type, int code, int offset,
52 __u32 info);
53
54 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
55 int features);
56
57 unsigned int flags; /* INET6_PROTO_xxx */
58};
59
60#define INET6_PROTO_NOPOLICY 0x1
61#define INET6_PROTO_FINAL 0x2
62/* This should be set for any extension header which is compatible with GSO. */
63#define INET6_PROTO_GSO_EXTHDR 0x4
64#endif
65
66/* This is used to register socket interfaces for IP protocols. */
67struct inet_protosw {
68 struct list_head list;
69
70 /* These two fields form the lookup key. */
71 unsigned short type; /* This is the 2nd argument to socket(2). */
72 int protocol; /* This is the L4 protocol number. */
73
74 struct proto *prot;
75 const struct proto_ops *ops;
76
77 int capability; /* Which (if any) capability do
78 * we need to use this socket
79 * interface?
80 */
81 char no_check; /* checksum on rcv/xmit/none? */
82 unsigned char flags; /* See INET_PROTOSW_* below. */
83};
84#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
85#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
86#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
87
88extern struct net_protocol *inet_protocol_base;
89extern struct net_protocol *inet_protos[MAX_INET_PROTOS];
90
91#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
92extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
93#endif
94
95extern int inet_add_protocol(struct net_protocol *prot, unsigned char num);
96extern int inet_del_protocol(struct net_protocol *prot, unsigned char num);
97extern void inet_register_protosw(struct inet_protosw *p);
98extern void inet_unregister_protosw(struct inet_protosw *p);
99
100#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
101extern int inet6_add_protocol(struct inet6_protocol *prot, unsigned char num);
102extern int inet6_del_protocol(struct inet6_protocol *prot, unsigned char num);
103extern void inet6_register_protosw(struct inet_protosw *p);
104extern void inet6_unregister_protosw(struct inet_protosw *p);
105#endif
106
107#endif /* _PROTOCOL_H */