include/rxrpc/packet.h - maze/linux - Git at Google

 /* packet.h: Rx packet layout and definitions
  *
  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * 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

 #include <rxrpc/types.h>

 #define RXRPC_IPUDP_SIZE		28
 extern size_t RXRPC_MAX_PACKET_SIZE;
 #define RXRPC_MAX_PACKET_DATA_SIZE	(RXRPC_MAX_PACKET_SIZE - sizeof(struct rxrpc_header))
 #define RXRPC_LOCAL_PACKET_SIZE		RXRPC_MAX_PACKET_SIZE
 #define RXRPC_REMOTE_PACKET_SIZE	(576 - RXRPC_IPUDP_SIZE)

 /*****************************************************************************/
 /*
  * on-the-wire Rx packet header
  * - all multibyte fields should be in network byte order
  */
 struct rxrpc_header
 {
 	__be32		epoch;		/* client boot timestamp */

 	__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) */
 #define RXRPC_PROCESS_MAXCALLS	(1<<2)	/* maximum number of active calls per conn (power of 2) */

 	__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_N_PACKET_TYPES		9	/* 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 */
 	uint8_t		securityIndex;	/* security protocol ID */
 	union {
 		__be16	_rsvd;		/* reserved */
 		__be16	cksum;		/* kerberos security checksum */
 	};
 	__be16		serviceId;	/* service ID */

 } __attribute__((packed));

 #define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X)

 extern const char *rxrpc_pkts[];

 /*****************************************************************************/
 /*
  * 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;
 	__be16		_rsvd;		/* reserved (used by kerberos security as cksum) */
 };

 #define RXRPC_JUMBO_DATALEN	1412	/* non-terminal jumbo packet data length */

 /*****************************************************************************/
 /*
  * 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 */

 	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

 } __attribute__((packed));

 /*
  * 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 */
 } __attribute__((packed));

 /*****************************************************************************/
 /*
  * Kerberos security type-2 response packet
  */
 struct rxkad_response {
 	__be32		version;	/* version of this reponse 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  */
 } __attribute__((packed));

 /*****************************************************************************/
 /*
  * RxRPC-level abort codes
  */
 #define RX_CALL_DEAD		-1	/* call/conn has been inactive and is shut down */
 #define RX_INVALID_OPERATION	-2	/* invalid operation requested / attempted */
 #define RX_CALL_TIMEOUT		-3	/* call timeout exceeded */
 #define RX_EOF			-4	/* unexpected end of data on read op */
 #define RX_PROTOCOL_ERROR	-5	/* low-level protocol error */
 #define RX_USER_ABORT		-6	/* generic user abort */
 #define RX_ADDRINUSE		-7	/* UDP port in use */
 #define RX_DEBUGI_BADTYPE	-8	/* bad debugging packet type */

 /*
  * (un)marshalling abort codes (rxgen)
  */
 #define	RXGEN_CC_MARSHAL    -450
 #define	RXGEN_CC_UNMARSHAL  -451
 #define	RXGEN_SS_MARSHAL    -452
 #define	RXGEN_SS_UNMARSHAL  -453
 #define	RXGEN_DECODE	    -454
 #define	RXGEN_OPCODE	    -455
 #define	RXGEN_SS_XDRFREE    -456
 #define	RXGEN_CC_XDRFREE    -457

 /*
  * Rx kerberos security abort codes
  * - unfortunately we have no generalised security abort codes to say things
  *   like "unsupported security", so we have to use these instead and hope the
  *   other side understands
  */
 #define RXKADINCONSISTENCY	19270400	/* security module structure inconsistent */
 #define RXKADPACKETSHORT	19270401	/* packet too short for security challenge */
 #define RXKADLEVELFAIL		19270402	/* security level negotiation failed */
 #define RXKADTICKETLEN		19270403	/* ticket length too short or too long */
 #define RXKADOUTOFSEQUENCE	19270404	/* packet had bad sequence number */
 #define RXKADNOAUTH		19270405	/* caller not authorised */
 #define RXKADBADKEY		19270406	/* illegal key: bad parity or weak */
 #define RXKADBADTICKET		19270407	/* security object was passed a bad ticket */
 #define RXKADUNKNOWNKEY		19270408	/* ticket contained unknown key version number */
 #define RXKADEXPIRED		19270409	/* authentication expired */
 #define RXKADSEALEDINCON	19270410	/* sealed data inconsistent */
 #define RXKADDATALEN		19270411	/* user data too long */
 #define RXKADILLEGALLEVEL	19270412	/* caller not authorised to use encrypted conns */

 #endif /* _LINUX_RXRPC_PACKET_H */
	/* packet.h: Rx packet layout and definitions
	*
	* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
	* Written by David Howells (dhowells@redhat.com)
	*
	* 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

	#include <rxrpc/types.h>

	#define RXRPC_IPUDP_SIZE 28
	extern size_t RXRPC_MAX_PACKET_SIZE;
	#define RXRPC_MAX_PACKET_DATA_SIZE (RXRPC_MAX_PACKET_SIZE - sizeof(struct rxrpc_header))
	#define RXRPC_LOCAL_PACKET_SIZE RXRPC_MAX_PACKET_SIZE
	#define RXRPC_REMOTE_PACKET_SIZE (576 - RXRPC_IPUDP_SIZE)

	/*****************************************************************************/
	/*
	* on-the-wire Rx packet header
	* - all multibyte fields should be in network byte order
	*/
	struct rxrpc_header
	{
	__be32 epoch; /* client boot timestamp */

	__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) */
	#define RXRPC_PROCESS_MAXCALLS (1<<2) /* maximum number of active calls per conn (power of 2) */

	__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_N_PACKET_TYPES 9 /* 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 */
	uint8_t securityIndex; /* security protocol ID */
	union {
	__be16 _rsvd; /* reserved */
	__be16 cksum; /* kerberos security checksum */
	};
	__be16 serviceId; /* service ID */

	} __attribute__((packed));

	#define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X)

	extern const char *rxrpc_pkts[];

	/*****************************************************************************/
	/*
	* 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;
	__be16 _rsvd; /* reserved (used by kerberos security as cksum) */
	};

	#define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */

	/*****************************************************************************/
	/*
	* 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 */

	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

	} __attribute__((packed));

	/*
	* 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 */
	} __attribute__((packed));

	/*****************************************************************************/
	/*
	* Kerberos security type-2 response packet
	*/
	struct rxkad_response {
	__be32 version; /* version of this reponse 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 */
	} __attribute__((packed));

	/*****************************************************************************/
	/*
	* RxRPC-level abort codes
	*/
	#define RX_CALL_DEAD -1 /* call/conn has been inactive and is shut down */
	#define RX_INVALID_OPERATION -2 /* invalid operation requested / attempted */
	#define RX_CALL_TIMEOUT -3 /* call timeout exceeded */
	#define RX_EOF -4 /* unexpected end of data on read op */
	#define RX_PROTOCOL_ERROR -5 /* low-level protocol error */
	#define RX_USER_ABORT -6 /* generic user abort */
	#define RX_ADDRINUSE -7 /* UDP port in use */
	#define RX_DEBUGI_BADTYPE -8 /* bad debugging packet type */

	/*
	* (un)marshalling abort codes (rxgen)
	*/
	#define RXGEN_CC_MARSHAL -450
	#define RXGEN_CC_UNMARSHAL -451
	#define RXGEN_SS_MARSHAL -452
	#define RXGEN_SS_UNMARSHAL -453
	#define RXGEN_DECODE -454
	#define RXGEN_OPCODE -455
	#define RXGEN_SS_XDRFREE -456
	#define RXGEN_CC_XDRFREE -457

	/*
	* Rx kerberos security abort codes
	* - unfortunately we have no generalised security abort codes to say things
	* like "unsupported security", so we have to use these instead and hope the
	* other side understands
	*/
	#define RXKADINCONSISTENCY 19270400 /* security module structure inconsistent */
	#define RXKADPACKETSHORT 19270401 /* packet too short for security challenge */
	#define RXKADLEVELFAIL 19270402 /* security level negotiation failed */
	#define RXKADTICKETLEN 19270403 /* ticket length too short or too long */
	#define RXKADOUTOFSEQUENCE 19270404 /* packet had bad sequence number */
	#define RXKADNOAUTH 19270405 /* caller not authorised */
	#define RXKADBADKEY 19270406 /* illegal key: bad parity or weak */
	#define RXKADBADTICKET 19270407 /* security object was passed a bad ticket */
	#define RXKADUNKNOWNKEY 19270408 /* ticket contained unknown key version number */
	#define RXKADEXPIRED 19270409 /* authentication expired */
	#define RXKADSEALEDINCON 19270410 /* sealed data inconsistent */
	#define RXKADDATALEN 19270411 /* user data too long */
	#define RXKADILLEGALLEVEL 19270412 /* caller not authorised to use encrypted conns */

	#endif /* _LINUX_RXRPC_PACKET_H */