LXR linux-old/include/net/protocol.h

   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 32              /* Must be a power of 2         */
  34
  35
  36/* This is used to register protocols. */
  37struct inet_protocol 
  38{
  39        int                     (*handler)(struct sk_buff *skb);
  40        void                    (*err_handler)(struct sk_buff *skb, u32 info);
  41        struct inet_protocol    *next;
  42        unsigned char           protocol;
  43        unsigned char           copy:1;
  44        void                    *data;
  45        const char              *name;
  46};
  47
  48#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
  49struct inet6_protocol 
  50{
  51        int     (*handler)(struct sk_buff *skb);
  52
  53        void    (*err_handler)(struct sk_buff *skb,
  54                               struct inet6_skb_parm *opt,
  55                               int type, int code, int offset,
  56                               __u32 info);
  57        struct inet6_protocol *next;
  58        unsigned char   protocol;
  59        unsigned char   copy:1;
  60        void            *data;
  61        const char      *name;
  62};
  63
  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        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
  87extern struct inet_protocol *inet_protocol_base;
  88extern struct inet_protocol *inet_protos[MAX_INET_PROTOS];
  89extern struct list_head inetsw[SOCK_MAX];
  90
  91#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
  92extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
  93extern struct list_head inetsw6[SOCK_MAX];
  94#endif
  95
  96extern void     inet_add_protocol(struct inet_protocol *prot);
  97extern int      inet_del_protocol(struct inet_protocol *prot);
  98extern void     inet_register_protosw(struct inet_protosw *p);
  99extern void     inet_unregister_protosw(struct inet_protosw *p);
 100
 101#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 102extern void     inet6_add_protocol(struct inet6_protocol *prot);
 103extern int      inet6_del_protocol(struct inet6_protocol *prot);
 104extern void     inet6_register_protosw(struct inet_protosw *p);
 105extern void     inet6_unregister_protosw(struct inet_protosw *p);
 106#endif
 107
 108#endif  /* _PROTOCOL_H */
 109