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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for the protocol dispatcher.
8 *
9 * Version: @(#)protocol.h 1.0.2 05/07/93
10 *
11 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * Changes:
14 * Alan Cox : Added a name field and a frag handler
15 * field for later.
16 * Alan Cox : Cleaned up, and sorted types.
17 * Pedro Roque : inet6 protocols
18 */
19
20#ifndef _PROTOCOL_H
21#define _PROTOCOL_H
22
23#include <linux/in6.h>
24#include <linux/skbuff.h>
25#if IS_ENABLED(CONFIG_IPV6)
26#include <linux/ipv6.h>
27#endif
28#include <linux/netdevice.h>
29
30/* This is one larger than the largest protocol value that can be
31 * found in an ipv4 or ipv6 header. Since in both cases the protocol
32 * value is presented in a __u8, this is defined to be 256.
33 */
34#define MAX_INET_PROTOS 256
35
36/* This is used to register protocols. */
37struct net_protocol {
38 int (*early_demux)(struct sk_buff *skb);
39 int (*early_demux_handler)(struct sk_buff *skb);
40 int (*handler)(struct sk_buff *skb);
41
42 /* This returns an error if we weren't able to handle the error. */
43 int (*err_handler)(struct sk_buff *skb, u32 info);
44
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)
55struct inet6_protocol {
56 void (*early_demux)(struct sk_buff *skb);
57 void (*early_demux_handler)(struct sk_buff *skb);
58 int (*handler)(struct sk_buff *skb);
59
60 /* This returns an error if we weren't able to handle the error. */
61 int (*err_handler)(struct sk_buff *skb,
62 struct inet6_skb_parm *opt,
63 u8 type, u8 code, int offset,
64 __be32 info);
65
66 unsigned int flags; /* INET6_PROTO_xxx */
67};
68
69#define INET6_PROTO_NOPOLICY 0x1
70#define INET6_PROTO_FINAL 0x2
71#endif
72
73struct net_offload {
74 struct offload_callbacks callbacks;
75 unsigned int flags; /* Flags used by IPv6 for now */
76};
77/* This should be set for any extension header which is compatible with GSO. */
78#define INET6_PROTO_GSO_EXTHDR 0x1
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 unsigned char flags; /* See INET_PROTOSW_* below. */
92};
93#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
94#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
95#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
96
97extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
98extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
99extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
100
101#if IS_ENABLED(CONFIG_IPV6)
102extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
103#endif
104
105int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
106int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
107int inet_add_offload(const struct net_offload *prot, unsigned char num);
108int inet_del_offload(const struct net_offload *prot, unsigned char num);
109void inet_register_protosw(struct inet_protosw *p);
110void inet_unregister_protosw(struct inet_protosw *p);
111
112#if IS_ENABLED(CONFIG_IPV6)
113int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
114int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
115int inet6_register_protosw(struct inet_protosw *p);
116void inet6_unregister_protosw(struct inet_protosw *p);
117#endif
118int inet6_add_offload(const struct net_offload *prot, unsigned char num);
119int inet6_del_offload(const struct net_offload *prot, unsigned char num);
120
121#endif /* _PROTOCOL_H */