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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 | #if IS_ENABLED(CONFIG_IPV6) | |
29 | #include <linux/ipv6.h> | |
30 | #endif | |
31 | ||
32 | /* This is one larger than the largest protocol value that can be | |
33 | * found in an ipv4 or ipv6 header. Since in both cases the protocol | |
34 | * value is presented in a __u8, this is defined to be 256. | |
35 | */ | |
36 | #define MAX_INET_PROTOS 256 | |
37 | ||
38 | /* This is used to register protocols. */ | |
39 | struct net_protocol { | |
40 | void (*early_demux)(struct sk_buff *skb); | |
41 | int (*handler)(struct sk_buff *skb); | |
42 | void (*err_handler)(struct sk_buff *skb, u32 info); | |
43 | unsigned int no_policy:1, | |
44 | netns_ok:1; | |
45 | }; | |
46 | ||
47 | #if IS_ENABLED(CONFIG_IPV6) | |
48 | struct inet6_protocol { | |
49 | void (*early_demux)(struct sk_buff *skb); | |
50 | ||
51 | int (*handler)(struct sk_buff *skb); | |
52 | ||
53 | void (*err_handler)(struct sk_buff *skb, | |
54 | struct inet6_skb_parm *opt, | |
55 | u8 type, u8 code, int offset, | |
56 | __be32 info); | |
57 | unsigned int flags; /* INET6_PROTO_xxx */ | |
58 | }; | |
59 | ||
60 | #define INET6_PROTO_NOPOLICY 0x1 | |
61 | #define INET6_PROTO_FINAL 0x2 | |
62 | /* This should be set for any extension header which is compatible with GSO. */ | |
63 | #define INET6_PROTO_GSO_EXTHDR 0x4 | |
64 | #endif | |
65 | ||
66 | struct net_offload { | |
67 | int (*gso_send_check)(struct sk_buff *skb); | |
68 | struct sk_buff *(*gso_segment)(struct sk_buff *skb, | |
69 | netdev_features_t features); | |
70 | struct sk_buff **(*gro_receive)(struct sk_buff **head, | |
71 | struct sk_buff *skb); | |
72 | int (*gro_complete)(struct sk_buff *skb); | |
73 | unsigned int flags; /* Flags used by IPv6 for now */ | |
74 | }; | |
75 | ||
76 | /* This is used to register socket interfaces for IP protocols. */ | |
77 | struct inet_protosw { | |
78 | struct list_head list; | |
79 | ||
80 | /* These two fields form the lookup key. */ | |
81 | unsigned short type; /* This is the 2nd argument to socket(2). */ | |
82 | unsigned short protocol; /* This is the L4 protocol number. */ | |
83 | ||
84 | struct proto *prot; | |
85 | const struct proto_ops *ops; | |
86 | ||
87 | char no_check; /* checksum on rcv/xmit/none? */ | |
88 | unsigned char flags; /* See INET_PROTOSW_* below. */ | |
89 | }; | |
90 | #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ | |
91 | #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ | |
92 | #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ | |
93 | ||
94 | extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; | |
95 | extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; | |
96 | ||
97 | #if IS_ENABLED(CONFIG_IPV6) | |
98 | extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; | |
99 | extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; | |
100 | #endif | |
101 | ||
102 | extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num); | |
103 | extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num); | |
104 | extern int inet_add_offload(const struct net_offload *prot, unsigned char num); | |
105 | extern int inet_del_offload(const struct net_offload *prot, unsigned char num); | |
106 | extern void inet_register_protosw(struct inet_protosw *p); | |
107 | extern void inet_unregister_protosw(struct inet_protosw *p); | |
108 | ||
109 | #if IS_ENABLED(CONFIG_IPV6) | |
110 | extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); | |
111 | extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); | |
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 | extern int inet6_register_protosw(struct inet_protosw *p); | |
115 | extern void inet6_unregister_protosw(struct inet_protosw *p); | |
116 | #endif | |
117 | ||
118 | #endif /* _PROTOCOL_H */ |