linux/include/net/protocol.h
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   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/* This is one larger than the largest protocol value that can be
  33 * found in an ipv4 or ipv6 header.  Since in both cases the protocol
  34 * value is presented in a __u8, this is defined to be 256.
  35 */
  36#define MAX_INET_PROTOS         256
  37
  38/* This is used to register protocols. */
  39struct net_protocol {
  40        void                    (*early_demux)(struct sk_buff *skb);
  41        int                     (*handler)(struct sk_buff *skb);
  42        void                    (*err_handler)(struct sk_buff *skb, u32 info);
  43        int                     (*gso_send_check)(struct sk_buff *skb);
  44        struct sk_buff         *(*gso_segment)(struct sk_buff *skb,
  45                                               netdev_features_t features);
  46        struct sk_buff        **(*gro_receive)(struct sk_buff **head,
  47                                               struct sk_buff *skb);
  48        int                     (*gro_complete)(struct sk_buff *skb);
  49        unsigned int            no_policy:1,
  50                                netns_ok:1;
  51};
  52
  53#if IS_ENABLED(CONFIG_IPV6)
  54struct inet6_protocol {
  55        void    (*early_demux)(struct sk_buff *skb);
  56
  57        int     (*handler)(struct sk_buff *skb);
  58
  59        void    (*err_handler)(struct sk_buff *skb,
  60                               struct inet6_skb_parm *opt,
  61                               u8 type, u8 code, int offset,
  62                               __be32 info);
  63
  64        int     (*gso_send_check)(struct sk_buff *skb);
  65        struct sk_buff *(*gso_segment)(struct sk_buff *skb,
  66                                       netdev_features_t features);
  67        struct sk_buff **(*gro_receive)(struct sk_buff **head,
  68                                        struct sk_buff *skb);
  69        int     (*gro_complete)(struct sk_buff *skb);
  70
  71        unsigned int    flags;  /* INET6_PROTO_xxx */
  72};
  73
  74#define INET6_PROTO_NOPOLICY    0x1
  75#define INET6_PROTO_FINAL       0x2
  76/* This should be set for any extension header which is compatible with GSO. */
  77#define INET6_PROTO_GSO_EXTHDR  0x4
  78#endif
  79
  80/* This is used to register socket interfaces for IP protocols.  */
  81struct inet_protosw {
  82        struct list_head list;
  83
  84        /* These two fields form the lookup key.  */
  85        unsigned short   type;     /* This is the 2nd argument to socket(2). */
  86        unsigned short   protocol; /* This is the L4 protocol number.  */
  87
  88        struct proto     *prot;
  89        const struct proto_ops *ops;
  90  
  91        char             no_check;   /* checksum on rcv/xmit/none? */
  92        unsigned char    flags;      /* See INET_PROTOSW_* below.  */
  93};
  94#define INET_PROTOSW_REUSE 0x01      /* Are ports automatically reusable? */
  95#define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */
  96#define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */
  97
  98extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
  99
 100#if IS_ENABLED(CONFIG_IPV6)
 101extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
 102#endif
 103
 104extern int      inet_add_protocol(const struct net_protocol *prot, unsigned char num);
 105extern int      inet_del_protocol(const struct net_protocol *prot, unsigned char num);
 106extern void     inet_register_protosw(struct inet_protosw *p);
 107extern void     inet_unregister_protosw(struct inet_protosw *p);
 108
 109#if IS_ENABLED(CONFIG_IPV6)
 110extern int      inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
 111extern int      inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
 112extern int      inet6_register_protosw(struct inet_protosw *p);
 113extern void     inet6_unregister_protosw(struct inet_protosw *p);
 114#endif
 115
 116#endif  /* _PROTOCOL_H */
 117
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