/* * INET		An implementation of the TCP/IP protocol suite for the LINUX *		operating system.  INET is implemented using the  BSD Socket *		interface as the means of communication with the user level. * *		Definitions for the protocol dispatcher. * * Version:	@(#)protocol.h	1.0.2	05/07/93 * * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * *		This program is free software; you can redistribute it and/or *		modify it under the terms of the GNU General Public License *		as published by the Free Software Foundation; either version *		2 of the License, or (at your option) any later version. * *	Changes: *		Alan Cox	:	Added a name field and a frag handler *					field for later. *		Alan Cox	:	Cleaned up, and sorted types. *		Pedro Roque	:	inet6 protocols */ #ifndef _PROTOCOL_H#define _PROTOCOL_H #include <linux/in6.h>#include <linux/skbuff.h>#if IS_ENABLED(CONFIG_IPV6)#include <linux/ipv6.h>#endif#include <linux/netdevice.h> /* This is one larger than the largest protocol value that can be * found in an ipv4 or ipv6 header.  Since in both cases the protocol * value is presented in a __u8, this is defined to be 256. */#define MAX_INET_PROTOS		256 /* This is used to register protocols. */struct net_protocol {	void			(*early_demux)(struct sk_buff *skb);	int			(*handler)(struct sk_buff *skb);	void			(*err_handler)(struct sk_buff *skb, u32 info);	unsigned int		no_policy:1,				netns_ok:1;}; #if IS_ENABLED(CONFIG_IPV6)struct inet6_protocol {	void	(*early_demux)(struct sk_buff *skb); 	int	(*handler)(struct sk_buff *skb); 	void	(*err_handler)(struct sk_buff *skb,			       struct inet6_skb_parm *opt,			       u8 type, u8 code, int offset,			       __be32 info);	unsigned int	flags;	/* INET6_PROTO_xxx */}; #define INET6_PROTO_NOPOLICY	0x1#define INET6_PROTO_FINAL	0x2#endif struct net_offload {	struct offload_callbacks callbacks;	unsigned int		 flags;	/* Flags used by IPv6 for now */};/* This should be set for any extension header which is compatible with GSO. */#define INET6_PROTO_GSO_EXTHDR	0x1 /* This is used to register socket interfaces for IP protocols.  */struct inet_protosw {	struct list_head list;         /* These two fields form the lookup key.  */	unsigned short	 type;	   /* This is the 2nd argument to socket(2). */	unsigned short	 protocol; /* This is the L4 protocol number.  */ 	struct proto	 *prot;	const struct proto_ops *ops;  	char             no_check;   /* checksum on rcv/xmit/none? */	unsigned char	 flags;      /* See INET_PROTOSW_* below.  */};#define INET_PROTOSW_REUSE 0x01	     /* Are ports automatically reusable? */#define INET_PROTOSW_PERMANENT 0x02  /* Permanent protocols are unremovable. */#define INET_PROTOSW_ICSK      0x04  /* Is this an inet_connection_sock? */ extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; #if IS_ENABLED(CONFIG_IPV6)extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];#endif extern int	inet_add_protocol(const struct net_protocol *prot, unsigned char num);extern int	inet_del_protocol(const struct net_protocol *prot, unsigned char num);extern int	inet_add_offload(const struct net_offload *prot, unsigned char num);extern int	inet_del_offload(const struct net_offload *prot, unsigned char num);extern void	inet_register_protosw(struct inet_protosw *p);extern void	inet_unregister_protosw(struct inet_protosw *p); #if IS_ENABLED(CONFIG_IPV6)extern int	inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);extern int	inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);extern int	inet6_register_protosw(struct inet_protosw *p);extern void	inet6_unregister_protosw(struct inet_protosw *p);#endifextern int	inet6_add_offload(const struct net_offload *prot, unsigned char num);extern int	inet6_del_offload(const struct net_offload *prot, unsigned char num); #endif	/* _PROTOCOL_H */