[linux.git] / net / rxrpc / protocol.h

/* packet.h: Rx packet layout and definitions
 *
 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * 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.
 */

#ifndef _LINUX_RXRPC_PACKET_H
#define _LINUX_RXRPC_PACKET_H

typedef u32	rxrpc_seq_t;	/* Rx message sequence number */
typedef u32	rxrpc_serial_t;	/* Rx message serial number */
typedef __be32	rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */
typedef __be32	rxrpc_serial_net_t; /* on-the-wire Rx message serial number */

/*****************************************************************************/
/*
 * on-the-wire Rx packet header
 * - all multibyte fields should be in network byte order
 */
struct rxrpc_wire_header {
	__be32		epoch;		/* client boot timestamp */
#define RXRPC_RANDOM_EPOCH	0x80000000	/* Random if set, date-based if not */

	__be32		cid;		/* connection and channel ID */
#define RXRPC_MAXCALLS		4			/* max active calls per conn */
#define RXRPC_CHANNELMASK	(RXRPC_MAXCALLS-1)	/* mask for channel ID */
#define RXRPC_CIDMASK		(~RXRPC_CHANNELMASK)	/* mask for connection ID */
#define RXRPC_CIDSHIFT		ilog2(RXRPC_MAXCALLS)	/* shift for connection ID */
#define RXRPC_CID_INC		(1 << RXRPC_CIDSHIFT)	/* connection ID increment */

	__be32		callNumber;	/* call ID (0 for connection-level packets) */
	__be32		seq;		/* sequence number of pkt in call stream */
	__be32		serial;		/* serial number of pkt sent to network */

	uint8_t		type;		/* packet type */
#define RXRPC_PACKET_TYPE_DATA		1	/* data */
#define RXRPC_PACKET_TYPE_ACK		2	/* ACK */
#define RXRPC_PACKET_TYPE_BUSY		3	/* call reject */
#define RXRPC_PACKET_TYPE_ABORT		4	/* call/connection abort */
#define RXRPC_PACKET_TYPE_ACKALL	5	/* ACK all outstanding packets on call */
#define RXRPC_PACKET_TYPE_CHALLENGE	6	/* connection security challenge (SRVR->CLNT) */
#define RXRPC_PACKET_TYPE_RESPONSE	7	/* connection secutity response (CLNT->SRVR) */
#define RXRPC_PACKET_TYPE_DEBUG		8	/* debug info request */
#define RXRPC_PACKET_TYPE_VERSION	13	/* version string request */
#define RXRPC_N_PACKET_TYPES		14	/* number of packet types (incl type 0) */

	uint8_t		flags;		/* packet flags */
#define RXRPC_CLIENT_INITIATED	0x01		/* signifies a packet generated by a client */
#define RXRPC_REQUEST_ACK	0x02		/* request an unconditional ACK of this packet */
#define RXRPC_LAST_PACKET	0x04		/* the last packet from this side for this call */
#define RXRPC_MORE_PACKETS	0x08		/* more packets to come */
#define RXRPC_JUMBO_PACKET	0x20		/* [DATA] this is a jumbo packet */
#define RXRPC_SLOW_START_OK	0x20		/* [ACK] slow start supported */

	uint8_t		userStatus;	/* app-layer defined status */
#define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01	/* AuriStor service upgrade request */
	
	uint8_t		securityIndex;	/* security protocol ID */
	union {
		__be16	_rsvd;		/* reserved */
		__be16	cksum;		/* kerberos security checksum */
	};
	__be16		serviceId;	/* service ID */

} __packed;

#define RXRPC_SUPPORTED_PACKET_TYPES (			\
		(1 << RXRPC_PACKET_TYPE_DATA) |		\
		(1 << RXRPC_PACKET_TYPE_ACK) |		\
		(1 << RXRPC_PACKET_TYPE_BUSY) |		\
		(1 << RXRPC_PACKET_TYPE_ABORT) |	\
		(1 << RXRPC_PACKET_TYPE_ACKALL) |	\
		(1 << RXRPC_PACKET_TYPE_CHALLENGE) |	\
		(1 << RXRPC_PACKET_TYPE_RESPONSE) |	\
		/*(1 << RXRPC_PACKET_TYPE_DEBUG) | */	\
		(1 << RXRPC_PACKET_TYPE_VERSION))

/*****************************************************************************/
/*
 * jumbo packet secondary header
 * - can be mapped to read header by:
 *   - new_serial = serial + 1
 *   - new_seq = seq + 1
 *   - new_flags = j_flags
 *   - new__rsvd = j__rsvd
 *   - duplicating all other fields
 */
struct rxrpc_jumbo_header {
	uint8_t		flags;		/* packet flags (as per rxrpc_header) */
	uint8_t		pad;
	union {
		__be16	_rsvd;		/* reserved */
		__be16	cksum;		/* kerberos security checksum */
	};
};

#define RXRPC_JUMBO_DATALEN	1412	/* non-terminal jumbo packet data length */
#define RXRPC_JUMBO_SUBPKTLEN	(RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))

/*****************************************************************************/
/*
 * on-the-wire Rx ACK packet data payload
 * - all multibyte fields should be in network byte order
 */
struct rxrpc_ackpacket {
	__be16		bufferSpace;	/* number of packet buffers available */
	__be16		maxSkew;	/* diff between serno being ACK'd and highest serial no
					 * received */
	__be32		firstPacket;	/* sequence no of first ACK'd packet in attached list */
	__be32		previousPacket;	/* sequence no of previous packet received */
	__be32		serial;		/* serial no of packet that prompted this ACK */

	uint8_t		reason;		/* reason for ACK */
#define RXRPC_ACK_REQUESTED		1	/* ACK was requested on packet */
#define RXRPC_ACK_DUPLICATE		2	/* duplicate packet received */
#define RXRPC_ACK_OUT_OF_SEQUENCE	3	/* out of sequence packet received */
#define RXRPC_ACK_EXCEEDS_WINDOW	4	/* packet received beyond end of ACK window */
#define RXRPC_ACK_NOSPACE		5	/* packet discarded due to lack of buffer space */
#define RXRPC_ACK_PING			6	/* keep alive ACK */
#define RXRPC_ACK_PING_RESPONSE		7	/* response to RXRPC_ACK_PING */
#define RXRPC_ACK_DELAY			8	/* nothing happened since received packet */
#define RXRPC_ACK_IDLE			9	/* ACK due to fully received ACK window */
#define RXRPC_ACK__INVALID		10	/* Representation of invalid ACK reason */

	uint8_t		nAcks;		/* number of ACKs */
#define RXRPC_MAXACKS	255

	uint8_t		acks[0];	/* list of ACK/NAKs */
#define RXRPC_ACK_TYPE_NACK		0
#define RXRPC_ACK_TYPE_ACK		1

} __packed;

/* Some ACKs refer to specific packets and some are general and can be updated. */
#define RXRPC_ACK_UPDATEABLE ((1 << RXRPC_ACK_REQUESTED)	|	\
			      (1 << RXRPC_ACK_PING_RESPONSE)	|	\
			      (1 << RXRPC_ACK_DELAY)		|	\
			      (1 << RXRPC_ACK_IDLE))


/*
 * ACK packets can have a further piece of information tagged on the end
 */
struct rxrpc_ackinfo {
	__be32		rxMTU;		/* maximum Rx MTU size (bytes) [AFS 3.3] */
	__be32		maxMTU;		/* maximum interface MTU size (bytes) [AFS 3.3] */
	__be32		rwind;		/* Rx window size (packets) [AFS 3.4] */
	__be32		jumbo_max;	/* max packets to stick into a jumbo packet [AFS 3.5] */
};

/*****************************************************************************/
/*
 * Kerberos security type-2 challenge packet
 */
struct rxkad_challenge {
	__be32		version;	/* version of this challenge type */
	__be32		nonce;		/* encrypted random number */
	__be32		min_level;	/* minimum security level */
	__be32		__padding;	/* padding to 8-byte boundary */
} __packed;

/*****************************************************************************/
/*
 * Kerberos security type-2 response packet
 */
struct rxkad_response {
	__be32		version;	/* version of this response type */
	__be32		__pad;

	/* encrypted bit of the response */
	struct {
		__be32		epoch;		/* current epoch */
		__be32		cid;		/* parent connection ID */
		__be32		checksum;	/* checksum */
		__be32		securityIndex;	/* security type */
		__be32		call_id[4];	/* encrypted call IDs */
		__be32		inc_nonce;	/* challenge nonce + 1 */
		__be32		level;		/* desired level */
	} encrypted;

	__be32		kvno;		/* Kerberos key version number */
	__be32		ticket_len;	/* Kerberos ticket length  */
} __packed;

#endif /* _LINUX_RXRPC_PACKET_H */
Commit	Line	Data
1da177e4 LT	1	/* packet.h: Rx packet layout and definitions
1da177e4 LT	2	*
63b6be55	3	* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
1da177e4 LT	4	* Written by David Howells ([email protected])
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#ifndef _LINUX_RXRPC_PACKET_H
	13	#define _LINUX_RXRPC_PACKET_H
	14
63b6be55 DH	15	typedef u32 rxrpc_seq_t; /* Rx message sequence number */
	16	typedef u32 rxrpc_serial_t; /* Rx message serial number */
	17	typedef __be32 rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */
	18	typedef __be32 rxrpc_serial_net_t; /* on-the-wire Rx message serial number */
1da177e4 LT	19
	20	/*****************************************************************************/
	21	/*
	22	* on-the-wire Rx packet header
	23	* - all multibyte fields should be in network byte order
	24	*/
0d12f8a4	25	struct rxrpc_wire_header {
1da177e4	26	__be32 epoch; /* client boot timestamp */
5f2d9c44	27	#define RXRPC_RANDOM_EPOCH 0x80000000 /* Random if set, date-based if not */
1da177e4 LT	28
	29	__be32 cid; /* connection and channel ID */
	30	#define RXRPC_MAXCALLS 4 /* max active calls per conn */
	31	#define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */
	32	#define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */
17926a79 DH	33	#define RXRPC_CIDSHIFT ilog2(RXRPC_MAXCALLS) /* shift for connection ID */
17926a79 DH	34	#define RXRPC_CID_INC (1 << RXRPC_CIDSHIFT) /* connection ID increment */
1da177e4 LT	35
1da177e4 LT	36	__be32 callNumber; /* call ID (0 for connection-level packets) */
1da177e4 LT	37	__be32 seq; /* sequence number of pkt in call stream */
	38	__be32 serial; /* serial number of pkt sent to network */
	39
	40	uint8_t type; /* packet type */
	41	#define RXRPC_PACKET_TYPE_DATA 1 /* data */
	42	#define RXRPC_PACKET_TYPE_ACK 2 /* ACK */
	43	#define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */
	44	#define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */
	45	#define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */
	46	#define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */
	47	#define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */
	48	#define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */
44ba0698 DH	49	#define RXRPC_PACKET_TYPE_VERSION 13 /* version string request */
44ba0698 DH	50	#define RXRPC_N_PACKET_TYPES 14 /* number of packet types (incl type 0) */
1da177e4 LT	51
	52	uint8_t flags; /* packet flags */
	53	#define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */
	54	#define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */
	55	#define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */
	56	#define RXRPC_MORE_PACKETS 0x08 /* more packets to come */
	57	#define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */
	58	#define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */
	59
	60	uint8_t userStatus; /* app-layer defined status */
4722974d DH	61	#define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01 /* AuriStor service upgrade request */
4722974d DH	62
1da177e4	63	uint8_t securityIndex; /* security protocol ID */
17926a79 DH	64	union {
	65	__be16 _rsvd; /* reserved */
	66	__be16 cksum; /* kerberos security checksum */
	67	};
1da177e4 LT	68	__be16 serviceId; /* service ID */
1da177e4 LT	69
bc10502d	70	} __packed;
1da177e4	71
351c1e64 DH	72	#define RXRPC_SUPPORTED_PACKET_TYPES ( \
	73	(1 << RXRPC_PACKET_TYPE_DATA) \| \
	74	(1 << RXRPC_PACKET_TYPE_ACK) \| \
	75	(1 << RXRPC_PACKET_TYPE_BUSY) \| \
	76	(1 << RXRPC_PACKET_TYPE_ABORT) \| \
	77	(1 << RXRPC_PACKET_TYPE_ACKALL) \| \
	78	(1 << RXRPC_PACKET_TYPE_CHALLENGE) \| \
	79	(1 << RXRPC_PACKET_TYPE_RESPONSE) \| \
	80	/(1 << RXRPC_PACKET_TYPE_DEBUG) \| / \
	81	(1 << RXRPC_PACKET_TYPE_VERSION))
	82
1da177e4 LT	83	/*****************************************************************************/
	84	/*
	85	* jumbo packet secondary header
	86	* - can be mapped to read header by:
	87	* - new_serial = serial + 1
	88	* - new_seq = seq + 1
	89	* - new_flags = j_flags
	90	* - new__rsvd = j__rsvd
	91	* - duplicating all other fields
	92	*/
63b6be55	93	struct rxrpc_jumbo_header {
1da177e4 LT	94	uint8_t flags; /* packet flags (as per rxrpc_header) */
1da177e4 LT	95	uint8_t pad;
18f1387c DH	96	union {
	97	__be16 _rsvd; /* reserved */
	98	__be16 cksum; /* kerberos security checksum */
	99	};
1da177e4 LT	100	};
	101
	102	#define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */
18f1387c	103	#define RXRPC_JUMBO_SUBPKTLEN (RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
1da177e4 LT	104
	105	/*****************************************************************************/
	106	/*
	107	* on-the-wire Rx ACK packet data payload
	108	* - all multibyte fields should be in network byte order
	109	*/
63b6be55	110	struct rxrpc_ackpacket {
1da177e4 LT	111	__be16 bufferSpace; /* number of packet buffers available */
	112	__be16 maxSkew; /* diff between serno being ACK'd and highest serial no
	113	* received */
	114	__be32 firstPacket; /* sequence no of first ACK'd packet in attached list */
	115	__be32 previousPacket; /* sequence no of previous packet received */
	116	__be32 serial; /* serial no of packet that prompted this ACK */
	117
	118	uint8_t reason; /* reason for ACK */
	119	#define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */
	120	#define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */
	121	#define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */
	122	#define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */
	123	#define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */
	124	#define RXRPC_ACK_PING 6 /* keep alive ACK */
	125	#define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */
	126	#define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */
	127	#define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */
9c7ad434	128	#define RXRPC_ACK__INVALID 10 /* Representation of invalid ACK reason */
1da177e4 LT	129
	130	uint8_t nAcks; /* number of ACKs */
	131	#define RXRPC_MAXACKS 255
	132
	133	uint8_t acks[0]; /* list of ACK/NAKs */
	134	#define RXRPC_ACK_TYPE_NACK 0
	135	#define RXRPC_ACK_TYPE_ACK 1
	136
bc10502d	137	} __packed;
1da177e4	138
248f219c DH	139	/* Some ACKs refer to specific packets and some are general and can be updated. */
	140	#define RXRPC_ACK_UPDATEABLE ((1 << RXRPC_ACK_REQUESTED) \| \
	141	(1 << RXRPC_ACK_PING_RESPONSE) \| \
	142	(1 << RXRPC_ACK_DELAY) \| \
	143	(1 << RXRPC_ACK_IDLE))
	144
	145
17926a79 DH	146	/*
	147	* ACK packets can have a further piece of information tagged on the end
	148	*/
	149	struct rxrpc_ackinfo {
	150	__be32 rxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */
	151	__be32 maxMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */
	152	__be32 rwind; /* Rx window size (packets) [AFS 3.4] */
	153	__be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */
	154	};
	155
	156	/*****************************************************************************/
	157	/*
	158	* Kerberos security type-2 challenge packet
	159	*/
	160	struct rxkad_challenge {
	161	__be32 version; /* version of this challenge type */
	162	__be32 nonce; /* encrypted random number */
	163	__be32 min_level; /* minimum security level */
	164	__be32 __padding; /* padding to 8-byte boundary */
bc10502d	165	} __packed;
17926a79 DH	166
	167	/*****************************************************************************/
	168	/*
	169	* Kerberos security type-2 response packet
	170	*/
	171	struct rxkad_response {
25985edc	172	__be32 version; /* version of this response type */
17926a79 DH	173	__be32 __pad;
	174
	175	/* encrypted bit of the response */
	176	struct {
	177	__be32 epoch; /* current epoch */
	178	__be32 cid; /* parent connection ID */
	179	__be32 checksum; /* checksum */
	180	__be32 securityIndex; /* security type */
	181	__be32 call_id[4]; /* encrypted call IDs */
	182	__be32 inc_nonce; /* challenge nonce + 1 */
	183	__be32 level; /* desired level */
	184	} encrypted;
	185
	186	__be32 kvno; /* Kerberos key version number */
	187	__be32 ticket_len; /* Kerberos ticket length */
bc10502d	188	} __packed;
17926a79	189
1da177e4	190	#endif /* _LINUX_RXRPC_PACKET_H */