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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
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 | * | |
1da177e4 LT |
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 | ||
1da177e4 | 23 | #include <linux/in6.h> |
c6b641a4 | 24 | #include <linux/skbuff.h> |
dfd56b8b | 25 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
26 | #include <linux/ipv6.h> |
27 | #endif | |
f191a1d1 | 28 | #include <linux/netdevice.h> |
1da177e4 | 29 | |
f9242b6b DM |
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 | |
1da177e4 LT |
35 | |
36 | /* This is used to register protocols. */ | |
37 | struct net_protocol { | |
7487449c PA |
38 | int (*early_demux)(struct sk_buff *skb); |
39 | int (*early_demux_handler)(struct sk_buff *skb); | |
1da177e4 | 40 | int (*handler)(struct sk_buff *skb); |
32bbd879 SB |
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 | ||
f145049a | 45 | unsigned int no_policy:1, |
8ed1dc44 HFS |
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; | |
1da177e4 LT |
52 | }; |
53 | ||
dfd56b8b | 54 | #if IS_ENABLED(CONFIG_IPV6) |
fd2c3ef7 | 55 | struct inet6_protocol { |
c7109986 | 56 | void (*early_demux)(struct sk_buff *skb); |
dddb64bc | 57 | void (*early_demux_handler)(struct sk_buff *skb); |
e5bbef20 | 58 | int (*handler)(struct sk_buff *skb); |
1da177e4 | 59 | |
32bbd879 SB |
60 | /* This returns an error if we weren't able to handle the error. */ |
61 | int (*err_handler)(struct sk_buff *skb, | |
1da177e4 | 62 | struct inet6_skb_parm *opt, |
d5fdd6ba | 63 | u8 type, u8 code, int offset, |
04ce6909 | 64 | __be32 info); |
32bbd879 | 65 | |
1da177e4 LT |
66 | unsigned int flags; /* INET6_PROTO_xxx */ |
67 | }; | |
68 | ||
69 | #define INET6_PROTO_NOPOLICY 0x1 | |
70 | #define INET6_PROTO_FINAL 0x2 | |
71 | #endif | |
72 | ||
de27d001 | 73 | struct net_offload { |
f191a1d1 VY |
74 | struct offload_callbacks callbacks; |
75 | unsigned int flags; /* Flags used by IPv6 for now */ | |
de27d001 | 76 | }; |
c6b641a4 VY |
77 | /* This should be set for any extension header which is compatible with GSO. */ |
78 | #define INET6_PROTO_GSO_EXTHDR 0x1 | |
de27d001 | 79 | |
1da177e4 LT |
80 | /* This is used to register socket interfaces for IP protocols. */ |
81 | struct 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). */ | |
ee41e2df | 86 | unsigned short protocol; /* This is the L4 protocol number. */ |
1da177e4 LT |
87 | |
88 | struct proto *prot; | |
90ddc4f0 | 89 | const struct proto_ops *ops; |
1da177e4 | 90 | |
1da177e4 LT |
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. */ | |
d83d8461 | 95 | #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ |
1da177e4 | 96 | |
dddb64bc | 97 | extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; |
de27d001 | 98 | extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; |
c6b641a4 | 99 | extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; |
1da177e4 | 100 | |
dfd56b8b | 101 | #if IS_ENABLED(CONFIG_IPV6) |
dddb64bc | 102 | extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; |
1da177e4 LT |
103 | #endif |
104 | ||
f307c636 JP |
105 | int inet_add_protocol(const struct net_protocol *prot, unsigned char num); |
106 | int inet_del_protocol(const struct net_protocol *prot, unsigned char num); | |
107 | int inet_add_offload(const struct net_offload *prot, unsigned char num); | |
108 | int inet_del_offload(const struct net_offload *prot, unsigned char num); | |
109 | void inet_register_protosw(struct inet_protosw *p); | |
110 | void inet_unregister_protosw(struct inet_protosw *p); | |
1da177e4 | 111 | |
dfd56b8b | 112 | #if IS_ENABLED(CONFIG_IPV6) |
f307c636 JP |
113 | int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); |
114 | int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); | |
115 | int inet6_register_protosw(struct inet_protosw *p); | |
116 | void inet6_unregister_protosw(struct inet_protosw *p); | |
1da177e4 | 117 | #endif |
f307c636 JP |
118 | int inet6_add_offload(const struct net_offload *prot, unsigned char num); |
119 | int inet6_del_offload(const struct net_offload *prot, unsigned char num); | |
1da177e4 LT |
120 | |
121 | #endif /* _PROTOCOL_H */ |