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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 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};
48
49#if IS_ENABLED(CONFIG_IPV6)
50struct inet6_protocol {
51 void (*early_demux)(struct sk_buff *skb);
52
53 int (*handler)(struct sk_buff *skb);
54
55 void (*err_handler)(struct sk_buff *skb,
56 struct inet6_skb_parm *opt,
57 u8 type, u8 code, int offset,
58 __be32 info);
59 unsigned int flags; /* INET6_PROTO_xxx */
60};
61
62#define INET6_PROTO_NOPOLICY 0x1
63#define INET6_PROTO_FINAL 0x2
64#endif
65
66struct net_offload {
67 struct offload_callbacks callbacks;
68 unsigned int flags; /* Flags used by IPv6 for now */
69};
70/* This should be set for any extension header which is compatible with GSO. */
71#define INET6_PROTO_GSO_EXTHDR 0x1
72
73/* This is used to register socket interfaces for IP protocols. */
74struct inet_protosw {
75 struct list_head list;
76
77 /* These two fields form the lookup key. */
78 unsigned short type; /* This is the 2nd argument to socket(2). */
79 unsigned short protocol; /* This is the L4 protocol number. */
80
81 struct proto *prot;
82 const struct proto_ops *ops;
83
84 char no_check; /* checksum on rcv/xmit/none? */
85 unsigned char flags; /* See INET_PROTOSW_* below. */
86};
87#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
88#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
89#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
90
91extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
92extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
93extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
94
95#if IS_ENABLED(CONFIG_IPV6)
96extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
97#endif
98
99extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
100extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
101extern int inet_add_offload(const struct net_offload *prot, unsigned char num);
102extern int inet_del_offload(const struct net_offload *prot, unsigned char num);
103extern void inet_register_protosw(struct inet_protosw *p);
104extern void inet_unregister_protosw(struct inet_protosw *p);
105
106#if IS_ENABLED(CONFIG_IPV6)
107extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
108extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
109extern int inet6_register_protosw(struct inet_protosw *p);
110extern void inet6_unregister_protosw(struct inet_protosw *p);
111#endif
112extern int inet6_add_offload(const struct net_offload *prot, unsigned char num);
113extern int inet6_del_offload(const struct net_offload *prot, unsigned char num);
114
115#endif /* _PROTOCOL_H */