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/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. */
  36 struct net_protocol {
  37         int                     (*handler)(struct sk_buff *skb);
  38         void                    (*err_handler)(struct sk_buff *skb, u32 info);
  39         int                     (*gso_send_check)(struct sk_buff *skb);
  40         struct sk_buff         *(*gso_segment)(struct sk_buff *skb,
  41                                                int features);
  42         struct sk_buff        **(*gro_receive)(struct sk_buff **head,
  43                                                struct sk_buff *skb);
  44         int                     (*gro_complete)(struct sk_buff *skb);
  45         unsigned int            no_policy:1,
  46                                 netns_ok:1;
  47 };
  48
  49 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
  50 struct inet6_protocol
  51 {
  52         int     (*handler)(struct sk_buff *skb);
  53
  54         void    (*err_handler)(struct sk_buff *skb,
  55                                struct inet6_skb_parm *opt,
  56                                u8 type, u8 code, int offset,
  57                                __be32 info);
  58
  59         int     (*gso_send_check)(struct sk_buff *skb);
  60         struct sk_buff *(*gso_segment)(struct sk_buff *skb,
  61                                        int features);
  62         struct sk_buff **(*gro_receive)(struct sk_buff **head,
  63                                         struct sk_buff *skb);
  64         int     (*gro_complete)(struct sk_buff *skb);
  65
  66         unsigned int    flags;  /* INET6_PROTO_xxx */
  67 };
  68
  69 #define INET6_PROTO_NOPOLICY    0x1
  70 #define INET6_PROTO_FINAL       0x2
  71 /* This should be set for any extension header which is compatible with GSO. */
  72 #define INET6_PROTO_GSO_EXTHDR  0x4
  73 #endif
  74
  75 /* This is used to register socket interfaces for IP protocols.  */
  76 struct inet_protosw {
  77         struct list_head list;
  78
  79         /* These two fields form the lookup key.  */
  80         unsigned short   type;     /* This is the 2nd argument to socket(2). */
  81         unsigned short   protocol; /* This is the L4 protocol number.  */
  82
  83         struct proto     *prot;
  84         const struct proto_ops *ops;
  85
  86         int              capability; /* Which (if any) capability do
  87                                       * we need to use this socket
  88                                       * interface?
  89                                       */
  90         char             no_check;   /* checksum on rcv/xmit/none? */
  91         unsigned char    flags;      /* See INET_PROTOSW_* below.  */
  92 };
  93 #define INET_PROTOSW_REUSE 0x01      /* Are ports automatically reusable? */
  94 #define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */
  95 #define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */
  96
  97 extern const struct net_protocol *inet_protos[MAX_INET_PROTOS];
  98
  99 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 100 extern const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
 101 #endif
 102
 103 extern int      inet_add_protocol(const struct net_protocol *prot, unsigned char num);
 104 extern int      inet_del_protocol(const struct net_protocol *prot, unsigned char num);
 105 extern void     inet_register_protosw(struct inet_protosw *p);
 106 extern void     inet_unregister_protosw(struct inet_protosw *p);
 107
 108 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 109 extern int      inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
 110 extern int      inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
 111 extern int      inet6_register_protosw(struct inet_protosw *p);
 112 extern void     inet6_unregister_protosw(struct inet_protosw *p);
 113 #endif
 114
 115 #endif  /* _PROTOCOL_H */