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 #include <linux/skbuff.h>
 29 #if IS_ENABLED(CONFIG_IPV6)
 30 #include <linux/ipv6.h>
 31 #endif
 32 #include <linux/netdevice.h>
 33 
 34 /* This is one larger than the largest protocol value that can be
 35  * found in an ipv4 or ipv6 header.  Since in both cases the protocol
 36  * value is presented in a __u8, this is defined to be 256.
 37  */
 38 #define MAX_INET_PROTOS         256
 39 
 40 /* This is used to register protocols. */
 41 struct net_protocol {
 42         void                    (*early_demux)(struct sk_buff *skb);
 43         int                     (*handler)(struct sk_buff *skb);
 44         void                    (*err_handler)(struct sk_buff *skb, u32 info);
 45         unsigned int            no_policy:1,
 46                                 netns_ok:1;
 47 };
 48 
 49 #if IS_ENABLED(CONFIG_IPV6)
 50 struct inet6_protocol {
 51         void    (*early_demux)(struct sk_buff *skb);
 52 
 53         int     (*handler)(struct sk_buff *skb);
 54 
 55         void    (*err_handler)(struct sk_buff *skb,
 56                                struct inet6_skb_parm *opt,
 57                                u8 type, u8 code, int offset,
 58                                __be32 info);
 59         unsigned int    flags;  /* INET6_PROTO_xxx */
 60 };
 61 
 62 #define INET6_PROTO_NOPOLICY    0x1
 63 #define INET6_PROTO_FINAL       0x2
 64 #endif
 65 
 66 struct net_offload {
 67         struct offload_callbacks callbacks;
 68         unsigned int             flags; /* Flags used by IPv6 for now */
 69 };
 70 /* This should be set for any extension header which is compatible with GSO. */
 71 #define INET6_PROTO_GSO_EXTHDR  0x1
 72 
 73 /* This is used to register socket interfaces for IP protocols.  */
 74 struct inet_protosw {
 75         struct list_head list;
 76 
 77         /* These two fields form the lookup key.  */
 78         unsigned short   type;     /* This is the 2nd argument to socket(2). */
 79         unsigned short   protocol; /* This is the L4 protocol number.  */
 80 
 81         struct proto     *prot;
 82         const struct proto_ops *ops;
 83   
 84         char             no_check;   /* checksum on rcv/xmit/none? */
 85         unsigned char    flags;      /* See INET_PROTOSW_* below.  */
 86 };
 87 #define INET_PROTOSW_REUSE 0x01      /* Are ports automatically reusable? */
 88 #define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */
 89 #define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */
 90 
 91 extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
 92 extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
 93 extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
 94 
 95 #if IS_ENABLED(CONFIG_IPV6)
 96 extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
 97 #endif
 98 
 99 extern int      inet_add_protocol(const struct net_protocol *prot, unsigned char num);
100 extern int      inet_del_protocol(const struct net_protocol *prot, unsigned char num);
101 extern int      inet_add_offload(const struct net_offload *prot, unsigned char num);
102 extern int      inet_del_offload(const struct net_offload *prot, unsigned char num);
103 extern void     inet_register_protosw(struct inet_protosw *p);
104 extern void     inet_unregister_protosw(struct inet_protosw *p);
105 
106 #if IS_ENABLED(CONFIG_IPV6)
107 extern int      inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
108 extern int      inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
109 extern int      inet6_register_protosw(struct inet_protosw *p);
110 extern void     inet6_unregister_protosw(struct inet_protosw *p);
111 #endif
112 extern int      inet6_add_offload(const struct net_offload *prot, unsigned char num);
113 extern int      inet6_del_offload(const struct net_offload *prot, unsigned char num);
114 
115 #endif  /* _PROTOCOL_H */
116
This page was automatically generated by LXR 0.3.1 (source). • Linux is a registered trademark of Linus Torvalds
Linux Cross Reference

Free Electrons

Embedded Linux Experts

Linux/include/net/protocol.h
