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 #if IS_ENABLED(CONFIG_IPV6)
29 #include <linux/ipv6.h>
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.
36 #define MAX_INET_PROTOS 256
38 /* This is used to register protocols. */
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,
47 #if IS_ENABLED(CONFIG_IPV6)
48 struct inet6_protocol {
49 void (*early_demux)(struct sk_buff *skb);
51 int (*handler)(struct sk_buff *skb);
53 void (*err_handler)(struct sk_buff *skb,
54 struct inet6_skb_parm *opt,
55 u8 type, u8 code, int offset,
58 int (*gso_send_check)(struct sk_buff *skb);
59 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
60 netdev_features_t features);
61 struct sk_buff **(*gro_receive)(struct sk_buff **head,
63 int (*gro_complete)(struct sk_buff *skb);
65 unsigned int flags; /* INET6_PROTO_xxx */
68 #define INET6_PROTO_NOPOLICY 0x1
69 #define INET6_PROTO_FINAL 0x2
70 /* This should be set for any extension header which is compatible with GSO. */
71 #define INET6_PROTO_GSO_EXTHDR 0x4
75 int (*gso_send_check)(struct sk_buff *skb);
76 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
77 netdev_features_t features);
78 struct sk_buff **(*gro_receive)(struct sk_buff **head,
80 int (*gro_complete)(struct sk_buff *skb);
81 unsigned int flags; /* Flags used by IPv6 for now */
84 /* This is used to register socket interfaces for IP protocols. */
86 struct list_head list;
88 /* These two fields form the lookup key. */
89 unsigned short type; /* This is the 2nd argument to socket(2). */
90 unsigned short protocol; /* This is the L4 protocol number. */
93 const struct proto_ops *ops;
95 char no_check; /* checksum on rcv/xmit/none? */
96 unsigned char flags; /* See INET_PROTOSW_* below. */
98 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
99 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
100 #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
102 extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
103 extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
105 #if IS_ENABLED(CONFIG_IPV6)
106 extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
107 extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
110 extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
111 extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
112 extern int inet_add_offload(const struct net_offload *prot, unsigned char num);
113 extern int inet_del_offload(const struct net_offload *prot, unsigned char num);
114 extern void inet_register_protosw(struct inet_protosw *p);
115 extern void inet_unregister_protosw(struct inet_protosw *p);
117 #if IS_ENABLED(CONFIG_IPV6)
118 extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
119 extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
120 extern int inet6_add_offload(const struct net_offload *prot, unsigned char num);
121 extern int inet6_del_offload(const struct net_offload *prot, unsigned char num);
122 extern int inet6_register_protosw(struct inet_protosw *p);
123 extern void inet6_unregister_protosw(struct inet_protosw *p);
126 #endif /* _PROTOCOL_H */