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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#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. */
41struct net_protocol {
42 void (*early_demux)(struct sk_buff *skb);
43 void (*early_demux_handler)(struct sk_buff *skb);
44 int (*handler)(struct sk_buff *skb);
45 void (*err_handler)(struct sk_buff *skb, u32 info);
46 unsigned int no_policy:1,
47 netns_ok:1,
48 /* does the protocol do more stringent
49 * icmp tag validation than simple
50 * socket lookup?
51 */
52 icmp_strict_tag_validation:1;
53};
54
55#if IS_ENABLED(CONFIG_IPV6)
56struct inet6_protocol {
57 void (*early_demux)(struct sk_buff *skb);
58 void (*early_demux_handler)(struct sk_buff *skb);
59 int (*handler)(struct sk_buff *skb);
60
61 void (*err_handler)(struct sk_buff *skb,
62 struct inet6_skb_parm *opt,
63 u8 type, u8 code, int offset,
64 __be32 info);
65 unsigned int flags; /* INET6_PROTO_xxx */
66};
67
68#define INET6_PROTO_NOPOLICY 0x1
69#define INET6_PROTO_FINAL 0x2
70#endif
71
72struct net_offload {
73 struct offload_callbacks callbacks;
74 unsigned int flags; /* Flags used by IPv6 for now */
75};
76/* This should be set for any extension header which is compatible with GSO. */
77#define INET6_PROTO_GSO_EXTHDR 0x1
78
79/* This is used to register socket interfaces for IP protocols. */
80struct inet_protosw {
81 struct list_head list;
82
83 /* These two fields form the lookup key. */
84 unsigned short type; /* This is the 2nd argument to socket(2). */
85 unsigned short protocol; /* This is the L4 protocol number. */
86
87 struct proto *prot;
88 const struct proto_ops *ops;
89
90 unsigned char flags; /* See INET_PROTOSW_* below. */
91};
92#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
93#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
94#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
95
96extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
97extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
98extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
99
100#if IS_ENABLED(CONFIG_IPV6)
101extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
102#endif
103
104int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
105int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
106int inet_add_offload(const struct net_offload *prot, unsigned char num);
107int inet_del_offload(const struct net_offload *prot, unsigned char num);
108void inet_register_protosw(struct inet_protosw *p);
109void inet_unregister_protosw(struct inet_protosw *p);
110
111#if IS_ENABLED(CONFIG_IPV6)
112int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
113int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
114int inet6_register_protosw(struct inet_protosw *p);
115void inet6_unregister_protosw(struct inet_protosw *p);
116#endif
117int inet6_add_offload(const struct net_offload *prot, unsigned char num);
118int inet6_del_offload(const struct net_offload *prot, unsigned char num);
119
120#endif /* _PROTOCOL_H */