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