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 256 /* Must be a power of 2 */ 34 35 36 /* This is used to register protocols. */ 37 struct net_protocol { 38 int (*handler)(struct sk_buff *skb); 39 void (*err_handler)(struct sk_buff *skb, u32 info); 40 int no_policy; 41 }; 42 43 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 44 struct inet6_protocol 45 { 46 int (*handler)(struct sk_buff **skb); 47 48 void (*err_handler)(struct sk_buff *skb, 49 struct inet6_skb_parm *opt, 50 int type, int code, int offset, 51 __u32 info); 52 unsigned int flags; /* INET6_PROTO_xxx */ 53 }; 54 55 #define INET6_PROTO_NOPOLICY 0x1 56 #define INET6_PROTO_FINAL 0x2 57 #endif 58 59 /* This is used to register socket interfaces for IP protocols. */ 60 struct inet_protosw { 61 struct list_head list; 62 63 /* These two fields form the lookup key. */ 64 unsigned short type; /* This is the 2nd argument to socket(2). */ 65 int protocol; /* This is the L4 protocol number. */ 66 67 struct proto *prot; 68 const struct proto_ops *ops; 69 70 int capability; /* Which (if any) capability do 71 * we need to use this socket 72 * interface? 73 */ 74 char no_check; /* checksum on rcv/xmit/none? */ 75 unsigned char flags; /* See INET_PROTOSW_* below. */ 76 }; 77 #define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 78 #define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 79 #define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ 80 81 extern struct net_protocol *inet_protocol_base; 82 extern struct net_protocol *inet_protos[MAX_INET_PROTOS]; 83 84 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 85 extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS]; 86 #endif 87 88 extern int inet_add_protocol(struct net_protocol *prot, unsigned char num); 89 extern int inet_del_protocol(struct net_protocol *prot, unsigned char num); 90 extern void inet_register_protosw(struct inet_protosw *p); 91 extern void inet_unregister_protosw(struct inet_protosw *p); 92 93 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 94 extern int inet6_add_protocol(struct inet6_protocol *prot, unsigned char num); 95 extern int inet6_del_protocol(struct inet6_protocol *prot, unsigned char num); 96 extern void inet6_register_protosw(struct inet_protosw *p); 97 extern void inet6_unregister_protosw(struct inet_protosw *p); 98 #endif 99 100 #endif /* _PROTOCOL_H */ 101