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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 #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                                 /* does the protocol do more stringent
 48                                  * icmp tag validation than simple
 49                                  * socket lookup?
 50                                  */
 51                                 icmp_strict_tag_validation:1;
 52 };
 53 
 54 #if IS_ENABLED(CONFIG_IPV6)
 55 struct inet6_protocol {
 56         void    (*early_demux)(struct sk_buff *skb);
 57 
 58         int     (*handler)(struct sk_buff *skb);
 59 
 60         void    (*err_handler)(struct sk_buff *skb,
 61                                struct inet6_skb_parm *opt,
 62                                u8 type, u8 code, int offset,
 63                                __be32 info);
 64         unsigned int    flags;  /* INET6_PROTO_xxx */
 65 };
 66 
 67 #define INET6_PROTO_NOPOLICY    0x1
 68 #define INET6_PROTO_FINAL       0x2
 69 #endif
 70 
 71 struct net_offload {
 72         struct offload_callbacks callbacks;
 73         unsigned int             flags; /* Flags used by IPv6 for now */
 74 };
 75 /* This should be set for any extension header which is compatible with GSO. */
 76 #define INET6_PROTO_GSO_EXTHDR  0x1
 77 
 78 /* This is used to register socket interfaces for IP protocols.  */
 79 struct inet_protosw {
 80         struct list_head list;
 81 
 82         /* These two fields form the lookup key.  */
 83         unsigned short   type;     /* This is the 2nd argument to socket(2). */
 84         unsigned short   protocol; /* This is the L4 protocol number.  */
 85 
 86         struct proto     *prot;
 87         const struct proto_ops *ops;
 88   
 89         unsigned char    flags;      /* See INET_PROTOSW_* below.  */
 90 };
 91 #define INET_PROTOSW_REUSE 0x01      /* Are ports automatically reusable? */
 92 #define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */
 93 #define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */
 94 
 95 extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
 96 extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
 97 extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
 98 
 99 #if IS_ENABLED(CONFIG_IPV6)
100 extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
101 #endif
102 
103 int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
104 int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
105 int inet_add_offload(const struct net_offload *prot, unsigned char num);
106 int inet_del_offload(const struct net_offload *prot, unsigned char num);
107 void inet_register_protosw(struct inet_protosw *p);
108 void inet_unregister_protosw(struct inet_protosw *p);
109 
110 int  udp_add_offload(struct udp_offload *prot);
111 void udp_del_offload(struct udp_offload *prot);
112 
113 #if IS_ENABLED(CONFIG_IPV6)
114 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
115 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
116 int inet6_register_protosw(struct inet_protosw *p);
117 void inet6_unregister_protosw(struct inet_protosw *p);
118 #endif
119 int inet6_add_offload(const struct net_offload *prot, unsigned char num);
120 int inet6_del_offload(const struct net_offload *prot, unsigned char num);
121 
122 #endif  /* _PROTOCOL_H */
123 

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