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. */ |
37 | struct net_protocol { |
38 | int (*handler)(struct sk_buff *skb); |
39 | |
40 | /* This returns an error if we weren't able to handle the error. */ |
41 | int (*err_handler)(struct sk_buff *skb, u32 info); |
42 | |
43 | unsigned int no_policy:1, |
44 | /* does the protocol do more stringent |
45 | * icmp tag validation than simple |
46 | * socket lookup? |
47 | */ |
48 | icmp_strict_tag_validation:1; |
49 | }; |
50 | |
51 | #if IS_ENABLED(CONFIG_IPV6) |
52 | struct inet6_protocol { |
53 | int (*handler)(struct sk_buff *skb); |
54 | |
55 | /* This returns an error if we weren't able to handle the error. */ |
56 | int (*err_handler)(struct sk_buff *skb, |
57 | struct inet6_skb_parm *opt, |
58 | u8 type, u8 code, int offset, |
59 | __be32 info); |
60 | |
61 | unsigned int flags; /* INET6_PROTO_xxx */ |
62 | }; |
63 | |
64 | #define INET6_PROTO_NOPOLICY 0x1 |
65 | #define INET6_PROTO_FINAL 0x2 |
66 | #endif |
67 | |
68 | struct net_offload { |
69 | struct offload_callbacks callbacks; |
70 | unsigned int flags; /* Flags used by IPv6 for now */ |
71 | }; |
72 | /* This should be set for any extension header which is compatible with GSO. */ |
73 | #define INET6_PROTO_GSO_EXTHDR 0x1 |
74 | |
75 | /* This is used to register socket interfaces for IP protocols. */ |
76 | struct inet_protosw { |
77 | struct list_head list; |
78 | |
79 | /* These two fields form the lookup key. */ |
80 | unsigned short type; /* This is the 2nd argument to socket(2). */ |
81 | unsigned short protocol; /* This is the L4 protocol number. */ |
82 | |
83 | struct proto *prot; |
84 | const struct proto_ops *ops; |
85 | |
86 | unsigned char flags; /* See INET_PROTOSW_* below. */ |
87 | }; |
88 | #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ |
89 | #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ |
90 | #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ |
91 | |
92 | extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; |
93 | extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; |
94 | extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; |
95 | |
96 | #if IS_ENABLED(CONFIG_IPV6) |
97 | extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; |
98 | #endif |
99 | |
100 | int inet_add_protocol(const struct net_protocol *prot, unsigned char num); |
101 | int inet_del_protocol(const struct net_protocol *prot, unsigned char num); |
102 | int inet_add_offload(const struct net_offload *prot, unsigned char num); |
103 | int inet_del_offload(const struct net_offload *prot, unsigned char num); |
104 | void inet_register_protosw(struct inet_protosw *p); |
105 | void inet_unregister_protosw(struct inet_protosw *p); |
106 | |
107 | #if IS_ENABLED(CONFIG_IPV6) |
108 | int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); |
109 | int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); |
110 | int inet6_register_protosw(struct inet_protosw *p); |
111 | void inet6_unregister_protosw(struct inet_protosw *p); |
112 | #endif |
113 | int inet6_add_offload(const struct net_offload *prot, unsigned char num); |
114 | int inet6_del_offload(const struct net_offload *prot, unsigned char num); |
115 | |
116 | #endif /* _PROTOCOL_H */ |
117 | |