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.
6 * Definitions for the protocol dispatcher.
8 * Version: @(#)protocol.h 1.0.2 05/07/93
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.
18 * Alan Cox : Added a name field and a frag handler
20 * Alan Cox : Cleaned up, and sorted types.
21 * Pedro Roque : inet6 protocols
27 #include <linux/in6.h>
28 #if IS_ENABLED(CONFIG_IPV6)
29 #include <linux/ipv6.h>
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.
36 #define MAX_INET_PROTOS 256
38 /* This is used to register protocols. */
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 unsigned int no_policy
:1,
47 #if IS_ENABLED(CONFIG_IPV6)
48 struct inet6_protocol
{
49 void (*early_demux
)(struct sk_buff
*skb
);
51 int (*handler
)(struct sk_buff
*skb
);
53 void (*err_handler
)(struct sk_buff
*skb
,
54 struct inet6_skb_parm
*opt
,
55 u8 type
, u8 code
, int offset
,
57 unsigned int flags
; /* INET6_PROTO_xxx */
60 #define INET6_PROTO_NOPOLICY 0x1
61 #define INET6_PROTO_FINAL 0x2
62 /* This should be set for any extension header which is compatible with GSO. */
63 #define INET6_PROTO_GSO_EXTHDR 0x4
67 int (*gso_send_check
)(struct sk_buff
*skb
);
68 struct sk_buff
*(*gso_segment
)(struct sk_buff
*skb
,
69 netdev_features_t features
);
70 struct sk_buff
**(*gro_receive
)(struct sk_buff
**head
,
72 int (*gro_complete
)(struct sk_buff
*skb
);
73 unsigned int flags
; /* Flags used by IPv6 for now */
76 /* This is used to register socket interfaces for IP protocols. */
78 struct list_head list
;
80 /* These two fields form the lookup key. */
81 unsigned short type
; /* This is the 2nd argument to socket(2). */
82 unsigned short protocol
; /* This is the L4 protocol number. */
85 const struct proto_ops
*ops
;
87 char no_check
; /* checksum on rcv/xmit/none? */
88 unsigned char flags
; /* See INET_PROTOSW_* below. */
90 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
91 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
92 #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
94 extern const struct net_protocol __rcu
*inet_protos
[MAX_INET_PROTOS
];
95 extern const struct net_offload __rcu
*inet_offloads
[MAX_INET_PROTOS
];
97 #if IS_ENABLED(CONFIG_IPV6)
98 extern const struct inet6_protocol __rcu
*inet6_protos
[MAX_INET_PROTOS
];
99 extern const struct net_offload __rcu
*inet6_offloads
[MAX_INET_PROTOS
];
102 extern int inet_add_protocol(const struct net_protocol
*prot
, unsigned char num
);
103 extern int inet_del_protocol(const struct net_protocol
*prot
, unsigned char num
);
104 extern int inet_add_offload(const struct net_offload
*prot
, unsigned char num
);
105 extern int inet_del_offload(const struct net_offload
*prot
, unsigned char num
);
106 extern void inet_register_protosw(struct inet_protosw
*p
);
107 extern void inet_unregister_protosw(struct inet_protosw
*p
);
109 #if IS_ENABLED(CONFIG_IPV6)
110 extern int inet6_add_protocol(const struct inet6_protocol
*prot
, unsigned char num
);
111 extern int inet6_del_protocol(const struct inet6_protocol
*prot
, unsigned char num
);
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 extern int inet6_register_protosw(struct inet_protosw
*p
);
115 extern void inet6_unregister_protosw(struct inet_protosw
*p
);
118 #endif /* _PROTOCOL_H */