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 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 */