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/config.h> 28 #include <linux/in6.h> 29 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 30 #include <linux/ipv6.h> 31 #endif 32 33 #define MAX_INET_PROTOS 32 /* Must be a power of 2 */ 34 35 36 /* This is used to register protocols. */ 37 struct inet_protocol 38 { 39 int (*handler)(struct sk_buff *skb); 40 void (*err_handler)(struct sk_buff *skb, u32 info); 41 struct inet_protocol *next; 42 unsigned char protocol; 43 unsigned char copy:1; 44 void *data; 45 const char *name; 46 }; 47 48 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 49 struct inet6_protocol 50 { 51 int (*handler)(struct sk_buff *skb); 52 53 void (*err_handler)(struct sk_buff *skb, 54 struct inet6_skb_parm *opt, 55 int type, int code, int offset, 56 __u32 info); 57 struct inet6_protocol *next; 58 unsigned char protocol; 59 unsigned char copy:1; 60 void *data; 61 const char *name; 62 }; 63 64 #endif 65 66 /* This is used to register socket interfaces for IP protocols. */ 67 struct inet_protosw { 68 struct list_head list; 69 70 /* These two fields form the lookup key. */ 71 unsigned short type; /* This is the 2nd argument to socket(2). */ 72 int protocol; /* This is the L4 protocol number. */ 73 74 struct proto *prot; 75 struct proto_ops *ops; 76 77 int capability; /* Which (if any) capability do 78 * we need to use this socket 79 * interface? 80 */ 81 char no_check; /* checksum on rcv/xmit/none? */ 82 unsigned char flags; /* See INET_PROTOSW_* below. */ 83 }; 84 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 85 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 86 87 extern struct inet_protocol *inet_protocol_base; 88 extern struct inet_protocol *inet_protos[MAX_INET_PROTOS]; 89 extern struct list_head inetsw[SOCK_MAX]; 90 91 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 92 extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS]; 93 extern struct list_head inetsw6[SOCK_MAX]; 94 #endif 95 96 extern void inet_add_protocol(struct inet_protocol *prot); 97 extern int inet_del_protocol(struct inet_protocol *prot); 98 extern void inet_register_protosw(struct inet_protosw *p); 99 extern void inet_unregister_protosw(struct inet_protosw *p); 100 101 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 102 extern void inet6_add_protocol(struct inet6_protocol *prot); 103 extern int inet6_del_protocol(struct inet6_protocol *prot); 104 extern void inet6_register_protosw(struct inet_protosw *p); 105 extern void inet6_unregister_protosw(struct inet_protosw *p); 106 #endif 107 108 #endif /* _PROTOCOL_H */ 109