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.
6 * Definitions for the protocol dispatcher.
8 * Version: @(#)protocol.h 1.0.2 05/07/93
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.
18 * Alan Cox : Added a name field and a frag handler
20 * Alan Cox : Cleaned up, and sorted types.
21 * Pedro Roque : inet6 protocols
27 #include <linux/in6.h>
28 #include <linux/skbuff.h>
29 #if IS_ENABLED(CONFIG_IPV6)
30 #include <linux/ipv6.h>
32 #include <linux/netdevice.h>
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.
38 #define MAX_INET_PROTOS 256
40 /* This is used to register protocols. */
42 int (*handler)(struct sk_buff *skb);
43 void (*err_handler)(struct sk_buff *skb, u32 info);
44 unsigned int no_policy:1,
46 /* does the protocol do more stringent
47 * icmp tag validation than simple
50 icmp_strict_tag_validation:1;
53 #if IS_ENABLED(CONFIG_IPV6)
54 struct inet6_protocol {
55 int (*handler)(struct sk_buff *skb);
57 void (*err_handler)(struct sk_buff *skb,
58 struct inet6_skb_parm *opt,
59 u8 type, u8 code, int offset,
61 unsigned int flags; /* INET6_PROTO_xxx */
64 #define INET6_PROTO_NOPOLICY 0x1
65 #define INET6_PROTO_FINAL 0x2
69 struct offload_callbacks callbacks;
70 unsigned int flags; /* Flags used by IPv6 for now */
72 /* This should be set for any extension header which is compatible with GSO. */
73 #define INET6_PROTO_GSO_EXTHDR 0x1
75 /* This is used to register socket interfaces for IP protocols. */
77 struct list_head list;
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. */
84 const struct proto_ops *ops;
86 unsigned char flags; /* See INET_PROTOSW_* below. */
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? */
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];
96 #if IS_ENABLED(CONFIG_IPV6)
97 extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
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);
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);
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);
116 #endif /* _PROTOCOL_H */