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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. */ |
41 | struct 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) |
50 | struct 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 | |
66 | struct 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. */ |
74 | struct 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 | |
91 | extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; |
92 | extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; |
93 | extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; |
94 | |
95 | #if IS_ENABLED(CONFIG_IPV6) |
96 | extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; |
97 | #endif |
98 | |
99 | extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num); |
100 | extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num); |
101 | extern int inet_add_offload(const struct net_offload *prot, unsigned char num); |
102 | extern int inet_del_offload(const struct net_offload *prot, unsigned char num); |
103 | extern void inet_register_protosw(struct inet_protosw *p); |
104 | extern void inet_unregister_protosw(struct inet_protosw *p); |
105 | |
106 | #if IS_ENABLED(CONFIG_IPV6) |
107 | extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); |
108 | extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); |
109 | extern int inet6_register_protosw(struct inet_protosw *p); |
110 | extern void inet6_unregister_protosw(struct inet_protosw *p); |
111 | #endif |
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 | |
115 | #endif /* _PROTOCOL_H */ |
116 |
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