cregit-Linux how code gets into the kernel

Release 4.12 include/rxrpc/packet.h

Directory: include/rxrpc
/* packet.h: Rx packet layout and definitions
 *
 * Copyright (C) 2002, 2007 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


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 */
	
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;

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

Overall Contributors

PersonTokensPropCommitsCommitProp
David Howells58096.99%1280.00%
Al Viro132.17%16.67%
Eric Dumazet40.67%16.67%
Lucas De Marchi10.17%16.67%
Total598100.00%15100.00%
Directory: include/rxrpc
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