[mirror_ubuntu-eoan-kernel.git] / include / net / protocol.h

/*
 * 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 {
	int			(*early_demux)(struct sk_buff *skb);
	int			(*early_demux_handler)(struct sk_buff *skb);
	int			(*handler)(struct sk_buff *skb);

	/* This returns an error if we weren't able to handle the error. */
	int			(*err_handler)(struct sk_buff *skb, u32 info);

	unsigned int		no_policy:1,
				netns_ok:1,
				/* does the protocol do more stringent
				 * icmp tag validation than simple
				 * socket lookup?
				 */
				icmp_strict_tag_validation:1;
};

#if IS_ENABLED(CONFIG_IPV6)
struct inet6_protocol {
	void	(*early_demux)(struct sk_buff *skb);
	void    (*early_demux_handler)(struct sk_buff *skb);
	int	(*handler)(struct sk_buff *skb);

	/* This returns an error if we weren't able to handle the error. */
	int	(*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;
  
	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 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 struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
#endif

int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
int inet_add_offload(const struct net_offload *prot, unsigned char num);
int inet_del_offload(const struct net_offload *prot, unsigned char num);
void inet_register_protosw(struct inet_protosw *p);
void inet_unregister_protosw(struct inet_protosw *p);

#if IS_ENABLED(CONFIG_IPV6)
int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
int inet6_register_protosw(struct inet_protosw *p);
void inet6_unregister_protosw(struct inet_protosw *p);
#endif
int inet6_add_offload(const struct net_offload *prot, unsigned char num);
int inet6_del_offload(const struct net_offload *prot, unsigned char num);

#endif	/* _PROTOCOL_H */
Commit	Line	Data
1da177e4 LT	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
1da177e4	27	#include <linux/in6.h>
c6b641a4	28	#include <linux/skbuff.h>
dfd56b8b	29	#if IS_ENABLED(CONFIG_IPV6)
1da177e4 LT	30	#include <linux/ipv6.h>
1da177e4 LT	31	#endif
f191a1d1	32	#include <linux/netdevice.h>
1da177e4	33
f9242b6b DM	34	/* This is one larger than the largest protocol value that can be
	35	* found in an ipv4 or ipv6 header. Since in both cases the protocol
	36	* value is presented in a __u8, this is defined to be 256.
	37	*/
	38	#define MAX_INET_PROTOS 256
1da177e4 LT	39
	40	/* This is used to register protocols. */
	41	struct net_protocol {
7487449c PA	42	int (early_demux)(struct sk_buff skb);
7487449c PA	43	int (early_demux_handler)(struct sk_buff skb);
1da177e4	44	int (handler)(struct sk_buff skb);
32bbd879 SB	45
	46	/* This returns an error if we weren't able to handle the error. */
	47	int (err_handler)(struct sk_buff skb, u32 info);
	48
f145049a	49	unsigned int no_policy:1,
8ed1dc44 HFS	50	netns_ok:1,
	51	/* does the protocol do more stringent
	52	* icmp tag validation than simple
	53	* socket lookup?
	54	*/
	55	icmp_strict_tag_validation:1;
1da177e4 LT	56	};
1da177e4 LT	57
dfd56b8b	58	#if IS_ENABLED(CONFIG_IPV6)
fd2c3ef7	59	struct inet6_protocol {
c7109986	60	void (early_demux)(struct sk_buff skb);
dddb64bc	61	void (early_demux_handler)(struct sk_buff skb);
e5bbef20	62	int (handler)(struct sk_buff skb);
1da177e4	63
32bbd879 SB	64	/* This returns an error if we weren't able to handle the error. */
32bbd879 SB	65	int (err_handler)(struct sk_buff skb,
1da177e4	66	struct inet6_skb_parm *opt,
d5fdd6ba	67	u8 type, u8 code, int offset,
04ce6909	68	__be32 info);
32bbd879	69
1da177e4 LT	70	unsigned int flags; /* INET6_PROTO_xxx */
	71	};
	72
	73	#define INET6_PROTO_NOPOLICY 0x1
	74	#define INET6_PROTO_FINAL 0x2
	75	#endif
	76
de27d001	77	struct net_offload {
f191a1d1 VY	78	struct offload_callbacks callbacks;
f191a1d1 VY	79	unsigned int flags; /* Flags used by IPv6 for now */
de27d001	80	};
c6b641a4 VY	81	/* This should be set for any extension header which is compatible with GSO. */
c6b641a4 VY	82	#define INET6_PROTO_GSO_EXTHDR 0x1
de27d001	83
1da177e4 LT	84	/* This is used to register socket interfaces for IP protocols. */
	85	struct inet_protosw {
	86	struct list_head list;
	87
	88	/* These two fields form the lookup key. */
	89	unsigned short type; /* This is the 2nd argument to socket(2). */
ee41e2df	90	unsigned short protocol; /* This is the L4 protocol number. */
1da177e4 LT	91
1da177e4 LT	92	struct proto *prot;
90ddc4f0	93	const struct proto_ops *ops;
1da177e4	94
1da177e4 LT	95	unsigned char flags; /* See INET_PROTOSW_* below. */
	96	};
	97	#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
	98	#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
d83d8461	99	#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
1da177e4	100
dddb64bc	101	extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
de27d001	102	extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
c6b641a4	103	extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
1da177e4	104
dfd56b8b	105	#if IS_ENABLED(CONFIG_IPV6)
dddb64bc	106	extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
1da177e4 LT	107	#endif
1da177e4 LT	108
f307c636 JP	109	int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
	110	int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
	111	int inet_add_offload(const struct net_offload *prot, unsigned char num);
	112	int inet_del_offload(const struct net_offload *prot, unsigned char num);
	113	void inet_register_protosw(struct inet_protosw *p);
	114	void inet_unregister_protosw(struct inet_protosw *p);
1da177e4	115
dfd56b8b	116	#if IS_ENABLED(CONFIG_IPV6)
f307c636 JP	117	int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
	118	int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
	119	int inet6_register_protosw(struct inet_protosw *p);
	120	void inet6_unregister_protosw(struct inet_protosw *p);
1da177e4	121	#endif
f307c636 JP	122	int inet6_add_offload(const struct net_offload *prot, unsigned char num);
f307c636 JP	123	int inet6_del_offload(const struct net_offload *prot, unsigned char num);
1da177e4 LT	124
1da177e4 LT	125	#endif /* _PROTOCOL_H */