root/include/net/protocol.h

INCLUDED FROM

/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the protocol dispatcher.
 *
 * Version:     @(#)protocol.h  1.0.2   05/07/93
 *
 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      Changes:
 *              Alan Cox        :       Added a name field and a frag handler
 *                                      field for later.
 *              Alan Cox        :       Cleaned up, and sorted types.
 *              Pedro Roque     :       inet6 protocols
 */
 
#ifndef _PROTOCOL_H
#define _PROTOCOL_H

#include <linux/in6.h>
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
#include <linux/ipv6.h>
#endif

#define MAX_INET_PROTOS 256             /* Must be a power of 2         */


/* This is used to register protocols. */
struct net_protocol {
        int                     (*handler)(struct sk_buff *skb);
        void                    (*err_handler)(struct sk_buff *skb, u32 info);
        int                     (*gso_send_check)(struct sk_buff *skb);
        struct sk_buff         *(*gso_segment)(struct sk_buff *skb,
                                               int features);
        unsigned int            no_policy:1,
                                netns_ok:1;
};

#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
struct inet6_protocol 
{
        int     (*handler)(struct sk_buff *skb);

        void    (*err_handler)(struct sk_buff *skb,
                               struct inet6_skb_parm *opt,
                               int type, int code, int offset,
                               __be32 info);

        int     (*gso_send_check)(struct sk_buff *skb);
        struct sk_buff *(*gso_segment)(struct sk_buff *skb,
                                       int features);

        unsigned int    flags;  /* INET6_PROTO_xxx */
};

#define INET6_PROTO_NOPOLICY    0x1
#define INET6_PROTO_FINAL       0x2
/* This should be set for any extension header which is compatible with GSO. */
#define INET6_PROTO_GSO_EXTHDR  0x4
#endif

/* This is used to register socket interfaces for IP protocols.  */
struct inet_protosw {
        struct list_head list;

        /* These two fields form the lookup key.  */
        unsigned short   type;     /* This is the 2nd argument to socket(2). */
        unsigned short   protocol; /* This is the L4 protocol number.  */

        struct proto     *prot;
        const struct proto_ops *ops;
  
        int              capability; /* Which (if any) capability do
                                      * we need to use this socket
                                      * interface?
                                      */
        char             no_check;   /* checksum on rcv/xmit/none? */
        unsigned char    flags;      /* See INET_PROTOSW_* below.  */
};
#define INET_PROTOSW_REUSE 0x01      /* Are ports automatically reusable? */
#define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */
#define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */

extern struct net_protocol *inet_protocol_base;
extern struct net_protocol *inet_protos[MAX_INET_PROTOS];

#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
#endif

extern int      inet_add_protocol(struct net_protocol *prot, unsigned char num);
extern int      inet_del_protocol(struct net_protocol *prot, unsigned char num);
extern void     inet_register_protosw(struct inet_protosw *p);
extern void     inet_unregister_protosw(struct inet_protosw *p);

#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
extern int      inet6_add_protocol(struct inet6_protocol *prot, unsigned char num);
extern int      inet6_del_protocol(struct inet6_protocol *prot, unsigned char num);
extern int      inet6_register_protosw(struct inet_protosw *p);
extern void     inet6_unregister_protosw(struct inet_protosw *p);
#endif

#endif  /* _PROTOCOL_H */