17926a7932
Provide AF_RXRPC sockets that can be used to talk to AFS servers, or serve answers to AFS clients. KerberosIV security is fully supported. The patches and some example test programs can be found in: http://people.redhat.com/~dhowells/rxrpc/ This will eventually replace the old implementation of kernel-only RxRPC currently resident in net/rxrpc/. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
209 lines
8.3 KiB
C
209 lines
8.3 KiB
C
/* packet.h: Rx packet layout and definitions
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_RXRPC_PACKET_H
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#define _LINUX_RXRPC_PACKET_H
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#include <rxrpc/types.h>
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#define RXRPC_IPUDP_SIZE 28
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extern size_t RXRPC_MAX_PACKET_SIZE;
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#define RXRPC_MAX_PACKET_DATA_SIZE (RXRPC_MAX_PACKET_SIZE - sizeof(struct rxrpc_header))
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#define RXRPC_LOCAL_PACKET_SIZE RXRPC_MAX_PACKET_SIZE
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#define RXRPC_REMOTE_PACKET_SIZE (576 - RXRPC_IPUDP_SIZE)
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/*****************************************************************************/
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/*
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* on-the-wire Rx packet header
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* - all multibyte fields should be in network byte order
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*/
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struct rxrpc_header
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{
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__be32 epoch; /* client boot timestamp */
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__be32 cid; /* connection and channel ID */
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#define RXRPC_MAXCALLS 4 /* max active calls per conn */
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#define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */
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#define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */
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#define RXRPC_CIDSHIFT ilog2(RXRPC_MAXCALLS) /* shift for connection ID */
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#define RXRPC_CID_INC (1 << RXRPC_CIDSHIFT) /* connection ID increment */
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__be32 callNumber; /* call ID (0 for connection-level packets) */
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#define RXRPC_PROCESS_MAXCALLS (1<<2) /* maximum number of active calls per conn (power of 2) */
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__be32 seq; /* sequence number of pkt in call stream */
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__be32 serial; /* serial number of pkt sent to network */
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uint8_t type; /* packet type */
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#define RXRPC_PACKET_TYPE_DATA 1 /* data */
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#define RXRPC_PACKET_TYPE_ACK 2 /* ACK */
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#define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */
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#define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */
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#define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */
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#define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */
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#define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */
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#define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */
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#define RXRPC_N_PACKET_TYPES 9 /* number of packet types (incl type 0) */
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uint8_t flags; /* packet flags */
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#define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */
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#define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */
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#define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */
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#define RXRPC_MORE_PACKETS 0x08 /* more packets to come */
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#define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */
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#define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */
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uint8_t userStatus; /* app-layer defined status */
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uint8_t securityIndex; /* security protocol ID */
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union {
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__be16 _rsvd; /* reserved */
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__be16 cksum; /* kerberos security checksum */
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};
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__be16 serviceId; /* service ID */
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} __attribute__((packed));
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#define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X)
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extern const char *rxrpc_pkts[];
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/*****************************************************************************/
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/*
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* jumbo packet secondary header
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* - can be mapped to read header by:
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* - new_serial = serial + 1
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* - new_seq = seq + 1
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* - new_flags = j_flags
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* - new__rsvd = j__rsvd
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* - duplicating all other fields
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*/
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struct rxrpc_jumbo_header
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{
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uint8_t flags; /* packet flags (as per rxrpc_header) */
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uint8_t pad;
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__be16 _rsvd; /* reserved (used by kerberos security as cksum) */
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};
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#define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */
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/*****************************************************************************/
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/*
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* on-the-wire Rx ACK packet data payload
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* - all multibyte fields should be in network byte order
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*/
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struct rxrpc_ackpacket
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{
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__be16 bufferSpace; /* number of packet buffers available */
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__be16 maxSkew; /* diff between serno being ACK'd and highest serial no
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* received */
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__be32 firstPacket; /* sequence no of first ACK'd packet in attached list */
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__be32 previousPacket; /* sequence no of previous packet received */
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__be32 serial; /* serial no of packet that prompted this ACK */
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uint8_t reason; /* reason for ACK */
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#define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */
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#define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */
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#define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */
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#define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */
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#define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */
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#define RXRPC_ACK_PING 6 /* keep alive ACK */
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#define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */
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#define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */
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#define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */
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uint8_t nAcks; /* number of ACKs */
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#define RXRPC_MAXACKS 255
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uint8_t acks[0]; /* list of ACK/NAKs */
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#define RXRPC_ACK_TYPE_NACK 0
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#define RXRPC_ACK_TYPE_ACK 1
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} __attribute__((packed));
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/*
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* ACK packets can have a further piece of information tagged on the end
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*/
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struct rxrpc_ackinfo {
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__be32 rxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */
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__be32 maxMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */
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__be32 rwind; /* Rx window size (packets) [AFS 3.4] */
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__be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */
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};
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/*****************************************************************************/
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/*
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* Kerberos security type-2 challenge packet
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*/
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struct rxkad_challenge {
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__be32 version; /* version of this challenge type */
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__be32 nonce; /* encrypted random number */
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__be32 min_level; /* minimum security level */
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__be32 __padding; /* padding to 8-byte boundary */
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} __attribute__((packed));
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/*****************************************************************************/
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/*
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* Kerberos security type-2 response packet
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*/
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struct rxkad_response {
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__be32 version; /* version of this reponse type */
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__be32 __pad;
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/* encrypted bit of the response */
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struct {
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__be32 epoch; /* current epoch */
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__be32 cid; /* parent connection ID */
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__be32 checksum; /* checksum */
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__be32 securityIndex; /* security type */
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__be32 call_id[4]; /* encrypted call IDs */
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__be32 inc_nonce; /* challenge nonce + 1 */
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__be32 level; /* desired level */
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} encrypted;
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__be32 kvno; /* Kerberos key version number */
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__be32 ticket_len; /* Kerberos ticket length */
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} __attribute__((packed));
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/*****************************************************************************/
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/*
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* RxRPC-level abort codes
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*/
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#define RX_CALL_DEAD -1 /* call/conn has been inactive and is shut down */
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#define RX_INVALID_OPERATION -2 /* invalid operation requested / attempted */
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#define RX_CALL_TIMEOUT -3 /* call timeout exceeded */
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#define RX_EOF -4 /* unexpected end of data on read op */
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#define RX_PROTOCOL_ERROR -5 /* low-level protocol error */
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#define RX_USER_ABORT -6 /* generic user abort */
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#define RX_ADDRINUSE -7 /* UDP port in use */
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#define RX_DEBUGI_BADTYPE -8 /* bad debugging packet type */
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/*
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* Rx kerberos security abort codes
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* - unfortunately we have no generalised security abort codes to say things
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* like "unsupported security", so we have to use these instead and hope the
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* other side understands
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*/
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#define RXKADINCONSISTENCY 19270400 /* security module structure inconsistent */
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#define RXKADPACKETSHORT 19270401 /* packet too short for security challenge */
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#define RXKADLEVELFAIL 19270402 /* security level negotiation failed */
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#define RXKADTICKETLEN 19270403 /* ticket length too short or too long */
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#define RXKADOUTOFSEQUENCE 19270404 /* packet had bad sequence number */
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#define RXKADNOAUTH 19270405 /* caller not authorised */
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#define RXKADBADKEY 19270406 /* illegal key: bad parity or weak */
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#define RXKADBADTICKET 19270407 /* security object was passed a bad ticket */
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#define RXKADUNKNOWNKEY 19270408 /* ticket contained unknown key version number */
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#define RXKADEXPIRED 19270409 /* authentication expired */
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#define RXKADSEALEDINCON 19270410 /* sealed data inconsistent */
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#define RXKADDATALEN 19270411 /* user data too long */
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#define RXKADILLEGALLEVEL 19270412 /* caller not authorised to use encrypted conns */
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#endif /* _LINUX_RXRPC_PACKET_H */
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