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1da177e4 LT |
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 | ||
1da177e4 | 27 | #include <linux/in6.h> |
c6b641a4 | 28 | #include <linux/skbuff.h> |
dfd56b8b | 29 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
30 | #include <linux/ipv6.h> |
31 | #endif | |
f191a1d1 | 32 | #include <linux/netdevice.h> |
1da177e4 | 33 | |
f9242b6b DM |
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 | |
1da177e4 LT |
39 | |
40 | /* This is used to register protocols. */ | |
41 | struct net_protocol { | |
160eb5a6 | 42 | void (*early_demux)(struct sk_buff *skb); |
1da177e4 LT |
43 | int (*handler)(struct sk_buff *skb); |
44 | void (*err_handler)(struct sk_buff *skb, u32 info); | |
f145049a DL |
45 | unsigned int no_policy:1, |
46 | netns_ok:1; | |
1da177e4 LT |
47 | }; |
48 | ||
dfd56b8b | 49 | #if IS_ENABLED(CONFIG_IPV6) |
fd2c3ef7 | 50 | struct inet6_protocol { |
c7109986 ED |
51 | void (*early_demux)(struct sk_buff *skb); |
52 | ||
e5bbef20 | 53 | int (*handler)(struct sk_buff *skb); |
1da177e4 LT |
54 | |
55 | void (*err_handler)(struct sk_buff *skb, | |
56 | struct inet6_skb_parm *opt, | |
d5fdd6ba | 57 | u8 type, u8 code, int offset, |
04ce6909 | 58 | __be32 info); |
1da177e4 LT |
59 | unsigned int flags; /* INET6_PROTO_xxx */ |
60 | }; | |
61 | ||
62 | #define INET6_PROTO_NOPOLICY 0x1 | |
63 | #define INET6_PROTO_FINAL 0x2 | |
64 | #endif | |
65 | ||
de27d001 | 66 | struct net_offload { |
f191a1d1 VY |
67 | struct offload_callbacks callbacks; |
68 | unsigned int flags; /* Flags used by IPv6 for now */ | |
de27d001 | 69 | }; |
c6b641a4 VY |
70 | /* This should be set for any extension header which is compatible with GSO. */ |
71 | #define INET6_PROTO_GSO_EXTHDR 0x1 | |
de27d001 | 72 | |
1da177e4 LT |
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). */ | |
ee41e2df | 79 | unsigned short protocol; /* This is the L4 protocol number. */ |
1da177e4 LT |
80 | |
81 | struct proto *prot; | |
90ddc4f0 | 82 | const struct proto_ops *ops; |
1da177e4 | 83 | |
1da177e4 LT |
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. */ | |
d83d8461 | 89 | #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ |
1da177e4 | 90 | |
e0ad61ec | 91 | extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; |
de27d001 | 92 | extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; |
c6b641a4 | 93 | extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; |
1da177e4 | 94 | |
dfd56b8b | 95 | #if IS_ENABLED(CONFIG_IPV6) |
e0ad61ec | 96 | extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; |
1da177e4 LT |
97 | #endif |
98 | ||
32613090 AD |
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); | |
de27d001 VY |
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); | |
1da177e4 LT |
103 | extern void inet_register_protosw(struct inet_protosw *p); |
104 | extern void inet_unregister_protosw(struct inet_protosw *p); | |
105 | ||
dfd56b8b | 106 | #if IS_ENABLED(CONFIG_IPV6) |
41135cc8 AD |
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); | |
87c3efbf | 109 | extern int inet6_register_protosw(struct inet_protosw *p); |
1da177e4 LT |
110 | extern void inet6_unregister_protosw(struct inet_protosw *p); |
111 | #endif | |
c6b641a4 VY |
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); | |
1da177e4 LT |
114 | |
115 | #endif /* _PROTOCOL_H */ |