projects/linux·blob v3.6 · refs

116 lines · 3.9 KiB

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, <[email protected]>
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 */