[deliverable/linux.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>
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/ipv6.h>
#endif

/* 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);
	int			(*gso_send_check)(struct sk_buff *skb);
	struct sk_buff	       *(*gso_segment)(struct sk_buff *skb,
					       netdev_features_t features);
	struct sk_buff	      **(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
	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);

	int	(*gso_send_check)(struct sk_buff *skb);
	struct sk_buff *(*gso_segment)(struct sk_buff *skb,
				       netdev_features_t features);
	struct sk_buff **(*gro_receive)(struct sk_buff **head,
					struct sk_buff *skb);
	int	(*gro_complete)(struct sk_buff *skb);

	unsigned int	flags;	/* INET6_PROTO_xxx */
};

#define INET6_PROTO_NOPOLICY	0x1
#define INET6_PROTO_FINAL	0x2
/* This should be set for any extension header which is compatible with GSO. */
#define INET6_PROTO_GSO_EXTHDR	0x4
#endif

struct net_offload {
	int			(*gso_send_check)(struct sk_buff *skb);
	struct sk_buff	       *(*gso_segment)(struct sk_buff *skb,
					       netdev_features_t features);
	struct sk_buff	      **(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
};

/* 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];

#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);
#endif

#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>
dfd56b8b	28	#if IS_ENABLED(CONFIG_IPV6)
1da177e4 LT	29	#include <linux/ipv6.h>
	30	#endif
	31
f9242b6b DM	32	/* This is one larger than the largest protocol value that can be
	33	* found in an ipv4 or ipv6 header. Since in both cases the protocol
	34	* value is presented in a __u8, this is defined to be 256.
	35	*/
	36	#define MAX_INET_PROTOS 256
1da177e4 LT	37
	38	/* This is used to register protocols. */
	39	struct net_protocol {
160eb5a6	40	void (early_demux)(struct sk_buff skb);
1da177e4 LT	41	int (handler)(struct sk_buff skb);
1da177e4 LT	42	void (err_handler)(struct sk_buff skb, u32 info);
a430a43d	43	int (gso_send_check)(struct sk_buff skb);
576a30eb	44	struct sk_buff (gso_segment)(struct sk_buff *skb,
c8f44aff	45	netdev_features_t features);
73cc19f1 HX	46	struct sk_buff *(gro_receive)(struct sk_buff **head,
	47	struct sk_buff *skb);
	48	int (gro_complete)(struct sk_buff skb);
f145049a DL	49	unsigned int no_policy:1,
f145049a DL	50	netns_ok:1;
1da177e4 LT	51	};
1da177e4 LT	52
dfd56b8b	53	#if IS_ENABLED(CONFIG_IPV6)
fd2c3ef7	54	struct inet6_protocol {
c7109986 ED	55	void (early_demux)(struct sk_buff skb);
c7109986 ED	56
e5bbef20	57	int (handler)(struct sk_buff skb);
1da177e4 LT	58
	59	void (err_handler)(struct sk_buff skb,
	60	struct inet6_skb_parm *opt,
d5fdd6ba	61	u8 type, u8 code, int offset,
04ce6909	62	__be32 info);
adcfc7d0	63
a430a43d	64	int (gso_send_check)(struct sk_buff skb);
adcfc7d0	65	struct sk_buff (gso_segment)(struct sk_buff *skb,
c8f44aff	66	netdev_features_t features);
787e9208 HX	67	struct sk_buff *(gro_receive)(struct sk_buff **head,
	68	struct sk_buff *skb);
	69	int (gro_complete)(struct sk_buff skb);
adcfc7d0	70
1da177e4 LT	71	unsigned int flags; /* INET6_PROTO_xxx */
	72	};
	73
	74	#define INET6_PROTO_NOPOLICY 0x1
	75	#define INET6_PROTO_FINAL 0x2
adcfc7d0 HX	76	/* This should be set for any extension header which is compatible with GSO. */
adcfc7d0 HX	77	#define INET6_PROTO_GSO_EXTHDR 0x4
1da177e4 LT	78	#endif
1da177e4 LT	79
de27d001 VY	80	struct net_offload {
	81	int (gso_send_check)(struct sk_buff skb);
	82	struct sk_buff (gso_segment)(struct sk_buff *skb,
	83	netdev_features_t features);
	84	struct sk_buff *(gro_receive)(struct sk_buff **head,
	85	struct sk_buff *skb);
	86	int (gro_complete)(struct sk_buff skb);
	87	};
	88
1da177e4 LT	89	/* This is used to register socket interfaces for IP protocols. */
	90	struct inet_protosw {
	91	struct list_head list;
	92
	93	/* These two fields form the lookup key. */
	94	unsigned short type; /* This is the 2nd argument to socket(2). */
ee41e2df	95	unsigned short protocol; /* This is the L4 protocol number. */
1da177e4 LT	96
1da177e4 LT	97	struct proto *prot;
90ddc4f0	98	const struct proto_ops *ops;
1da177e4	99
1da177e4 LT	100	char no_check; /* checksum on rcv/xmit/none? */
	101	unsigned char flags; /* See INET_PROTOSW_* below. */
	102	};
	103	#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
	104	#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
d83d8461	105	#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
1da177e4	106
e0ad61ec	107	extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
de27d001	108	extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
1da177e4	109
dfd56b8b	110	#if IS_ENABLED(CONFIG_IPV6)
e0ad61ec	111	extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
1da177e4 LT	112	#endif
1da177e4 LT	113
32613090 AD	114	extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
32613090 AD	115	extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
de27d001 VY	116	extern int inet_add_offload(const struct net_offload *prot, unsigned char num);
de27d001 VY	117	extern int inet_del_offload(const struct net_offload *prot, unsigned char num);
1da177e4 LT	118	extern void inet_register_protosw(struct inet_protosw *p);
	119	extern void inet_unregister_protosw(struct inet_protosw *p);
	120
dfd56b8b	121	#if IS_ENABLED(CONFIG_IPV6)
41135cc8 AD	122	extern int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
41135cc8 AD	123	extern int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
87c3efbf	124	extern int inet6_register_protosw(struct inet_protosw *p);
1da177e4 LT	125	extern void inet6_unregister_protosw(struct inet_protosw *p);
	126	#endif
	127
	128	#endif /* _PROTOCOL_H */