Message-ID: <150066179644.18902.1952565883441251528.stgit@warthog.procyon.org.uk>
Date:   Fri, 21 Jul 2017 19:29:56 +0100
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/2] rxrpc: Move the packet.h include file into
 net/rxrpc/

Move the protocol description header file into net/rxrpc/ and rename it to
protocol.h.  It's no longer necessary to expose it as packets are no longer
exposed to kernel services (such as AFS) that use the facility.

The abort codes are transferred to the UAPI header instead as we pass these
back to userspace and also to kernel services.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/misc.c              |    1 
 fs/afs/rxrpc.c             |    1 
 include/rxrpc/packet.h     |  235 --------------------------------------------
 include/uapi/linux/rxrpc.h |   44 ++++++++
 net/rxrpc/ar-internal.h    |    2 
 net/rxrpc/protocol.h       |  190 ++++++++++++++++++++++++++++++++++++
 6 files changed, 235 insertions(+), 238 deletions(-)
 delete mode 100644 include/rxrpc/packet.h
 create mode 100644 net/rxrpc/protocol.h

diff --git a/fs/afs/misc.c b/fs/afs/misc.c
index 100b207efc9e..c05f1f1c0d41 100644
--- a/fs/afs/misc.c
+++ b/fs/afs/misc.c
@@ -12,7 +12,6 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/errno.h>
-#include <rxrpc/packet.h>
 #include "internal.h"
 #include "afs_fs.h"
 
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 02781e78ffb6..10743043d431 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -14,7 +14,6 @@
 
 #include <net/sock.h>
 #include <net/af_rxrpc.h>
-#include <rxrpc/packet.h>
 #include "internal.h"
 #include "afs_cm.h"
 
diff --git a/include/rxrpc/packet.h b/include/rxrpc/packet.h
deleted file mode 100644
index a2dcfb850b9f..000000000000
--- a/include/rxrpc/packet.h
+++ /dev/null
@@ -1,235 +0,0 @@
-/* packet.h: Rx packet layout and definitions
- *
- * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@...hat.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 */
-#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;
-
-/*****************************************************************************/
-/*
- * 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 */
diff --git a/include/uapi/linux/rxrpc.h b/include/uapi/linux/rxrpc.h
index 08e2fb9c70ae..9656aad8f8f7 100644
--- a/include/uapi/linux/rxrpc.h
+++ b/include/uapi/linux/rxrpc.h
@@ -77,4 +77,48 @@ enum rxrpc_cmsg_type {
 #define RXRPC_SECURITY_RXGK	4	/* gssapi-based */
 #define RXRPC_SECURITY_RXK5	5	/* kerberos 5 */
 
+/*
+ * 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 /* _UAPI_LINUX_RXRPC_H */
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 69b97339ff9d..8c0db9b3e4ab 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -15,7 +15,7 @@
 #include <net/netns/generic.h>
 #include <net/sock.h>
 #include <net/af_rxrpc.h>
-#include <rxrpc/packet.h>
+#include "protocol.h"
 
 #if 0
 #define CHECK_SLAB_OKAY(X)				     \
diff --git a/net/rxrpc/protocol.h b/net/rxrpc/protocol.h
new file mode 100644
index 000000000000..4bddcf3face3
--- /dev/null
+++ b/net/rxrpc/protocol.h
@@ -0,0 +1,190 @@
+/* packet.h: Rx packet layout and definitions
+ *
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@...hat.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 */
+#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 */

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