/* 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 */