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/config.h>
28 #include <linux/in6.h>
29 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
30 #include <linux/ipv6.h>
31 #endif
32
33 #define MAX_INET_PROTOS 256 /* Must be a power of 2 */
34
35
36 /* This is used to register protocols. */
37 struct net_protocol {
38 int (*handler)(struct sk_buff *skb);
39 void (*err_handler)(struct sk_buff *skb, u32 info);
40 int no_policy;
41 };
42
43 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
44 struct inet6_protocol
45 {
46 int (*handler)(struct sk_buff **skb, unsigned int *nhoffp);
47
48 void (*err_handler)(struct sk_buff *skb,
49 struct inet6_skb_parm *opt,
50 int type, int code, int offset,
51 __u32 info);
52 unsigned int flags; /* INET6_PROTO_xxx */
53 };
54
55 #define INET6_PROTO_NOPOLICY 0x1
56 #define INET6_PROTO_FINAL 0x2
57 #endif
58
59 /* This is used to register socket interfaces for IP protocols. */
60 struct inet_protosw {
61 struct list_head list;
62
63 /* These two fields form the lookup key. */
64 unsigned short type; /* This is the 2nd argument to socket(2). */
65 int protocol; /* This is the L4 protocol number. */
66
67 struct proto *prot;
68 struct proto_ops *ops;
69
70 int capability; /* Which (if any) capability do
71 * we need to use this socket
72 * interface?
73 */
74 char no_check; /* checksum on rcv/xmit/none? */
75 unsigned char flags; /* See INET_PROTOSW_* below. */
76 };
77 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
78 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
79
80 extern struct net_protocol *inet_protocol_base;
81 extern struct net_protocol *inet_protos[MAX_INET_PROTOS];
82
83 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
84 extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
85 #endif
86
87 extern int inet_add_protocol(struct net_protocol *prot, unsigned char num);
88 extern int inet_del_protocol(struct net_protocol *prot, unsigned char num);
89 extern void inet_register_protosw(struct inet_protosw *p);
90 extern void inet_unregister_protosw(struct inet_protosw *p);
91
92 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
93 extern int inet6_add_protocol(struct inet6_protocol *prot, unsigned char num);
94 extern int inet6_del_protocol(struct inet6_protocol *prot, unsigned char num);
95 extern void inet6_register_protosw(struct inet_protosw *p);
96 extern void inet6_unregister_protosw(struct inet_protosw *p);
97 #endif
98
99 #endif /* _PROTOCOL_H */
100
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