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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 29#include <linux/ipv6.h> 30#endif 31 32#define MAX_INET_PROTOS 256 /* Must be a power of 2 */ 33 34 35/* This is used to register protocols. */ 36struct net_protocol { 37 int (*handler)(struct sk_buff *skb); 38 void (*err_handler)(struct sk_buff *skb, u32 info); 39 int (*gso_send_check)(struct sk_buff *skb); 40 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 41 int features); 42#ifdef CONFIG_INET_GRO 43 struct sk_buff **(*gro_receive)(struct sk_buff **head, 44 struct sk_buff *skb); 45 int (*gro_complete)(struct sk_buff *skb); 46#endif /* CONFIG_INET_GRO */ 47 int no_policy; 48}; 49 50#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 51struct inet6_protocol 52{ 53 int (*handler)(struct sk_buff **skb); 54 55 void (*err_handler)(struct sk_buff *skb, 56 struct inet6_skb_parm *opt, 57 int type, int code, int offset, 58 __be32 info); 59 60 int (*gso_send_check)(struct sk_buff *skb); 61 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 62 int features); 63 64 unsigned int flags; /* INET6_PROTO_xxx */ 65}; 66 67#define INET6_PROTO_NOPOLICY 0x1 68#define INET6_PROTO_FINAL 0x2 69/* This should be set for any extension header which is compatible with GSO. */ 70#define INET6_PROTO_GSO_EXTHDR 0x4 71#endif 72 73/* This is used to register socket interfaces for IP protocols. */ 74struct inet_protosw { 75 struct list_head list; 76 77 /* These two fields form the lookup key. */ 78 unsigned short type; /* This is the 2nd argument to socket(2). */ 79 unsigned short protocol; /* This is the L4 protocol number. */ 80 81 struct proto *prot; 82 const struct proto_ops *ops; 83 84 int capability; /* Which (if any) capability do 85 * we need to use this socket 86 * interface? 87 */ 88 char no_check; /* checksum on rcv/xmit/none? */ 89 unsigned char flags; /* See INET_PROTOSW_* below. */ 90}; 91#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ 92#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ 93#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ 94 95extern struct net_protocol *inet_protocol_base; 96extern struct net_protocol *inet_protos[MAX_INET_PROTOS]; 97 98#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 99extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS]; 100#endif 101 102extern int inet_add_protocol(struct net_protocol *prot, unsigned char num); 103extern int inet_del_protocol(struct net_protocol *prot, unsigned char num); 104extern void inet_register_protosw(struct inet_protosw *p); 105extern void inet_unregister_protosw(struct inet_protosw *p); 106 107#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 108extern int inet6_add_protocol(struct inet6_protocol *prot, unsigned char num); 109extern int inet6_del_protocol(struct inet6_protocol *prot, unsigned char num); 110extern void inet6_register_protosw(struct inet_protosw *p); 111extern void inet6_unregister_protosw(struct inet_protosw *p); 112#endif 113 114#endif /* _PROTOCOL_H */ 115