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Diffstat (limited to 'include/rxrpc/packet.h')
| -rw-r--r-- | include/rxrpc/packet.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/include/rxrpc/packet.h b/include/rxrpc/packet.h new file mode 100644 index 0000000..1447f0a --- /dev/null +++ b/include/rxrpc/packet.h @@ -0,0 +1,127 @@ +/* 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 2 /* shift for connection ID */ + + __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 */ + __be16 _rsvd; /* reserved (used by kerberos security as cksum) */ + __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)); + +#endif /* _LINUX_RXRPC_PACKET_H */ |