1/* packet.h: Rx packet layout and definitions 2 * 3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12#ifndef _LINUX_RXRPC_PACKET_H 13#define _LINUX_RXRPC_PACKET_H 14 15typedef u32 rxrpc_seq_t; /* Rx message sequence number */ 16typedef u32 rxrpc_serial_t; /* Rx message serial number */ 17typedef __be32 rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */ 18typedef __be32 rxrpc_serial_net_t; /* on-the-wire Rx message serial number */ 19 20/*****************************************************************************/ 21/* 22 * on-the-wire Rx packet header 23 * - all multibyte fields should be in network byte order 24 */ 25struct rxrpc_wire_header { 26 __be32 epoch; /* client boot timestamp */ 27#define RXRPC_RANDOM_EPOCH 0x80000000 /* Random if set, date-based if not */ 28 29 __be32 cid; /* connection and channel ID */ 30#define RXRPC_MAXCALLS 4 /* max active calls per conn */ 31#define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */ 32#define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */ 33#define RXRPC_CIDSHIFT ilog2(RXRPC_MAXCALLS) /* shift for connection ID */ 34#define RXRPC_CID_INC (1 << RXRPC_CIDSHIFT) /* connection ID increment */ 35 36 __be32 callNumber; /* call ID (0 for connection-level packets) */ 37 __be32 seq; /* sequence number of pkt in call stream */ 38 __be32 serial; /* serial number of pkt sent to network */ 39 40 uint8_t type; /* packet type */ 41#define RXRPC_PACKET_TYPE_DATA 1 /* data */ 42#define RXRPC_PACKET_TYPE_ACK 2 /* ACK */ 43#define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */ 44#define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */ 45#define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */ 46#define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */ 47#define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */ 48#define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */ 49#define RXRPC_PACKET_TYPE_VERSION 13 /* version string request */ 50#define RXRPC_N_PACKET_TYPES 14 /* number of packet types (incl type 0) */ 51 52 uint8_t flags; /* packet flags */ 53#define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */ 54#define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */ 55#define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */ 56#define RXRPC_MORE_PACKETS 0x08 /* more packets to come */ 57#define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */ 58#define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */ 59 60 uint8_t userStatus; /* app-layer defined status */ 61#define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01 /* AuriStor service upgrade request */ 62 63 uint8_t securityIndex; /* security protocol ID */ 64 union { 65 __be16 _rsvd; /* reserved */ 66 __be16 cksum; /* kerberos security checksum */ 67 }; 68 __be16 serviceId; /* service ID */ 69 70} __packed; 71 72#define RXRPC_SUPPORTED_PACKET_TYPES ( \ 73 (1 << RXRPC_PACKET_TYPE_DATA) | \ 74 (1 << RXRPC_PACKET_TYPE_ACK) | \ 75 (1 << RXRPC_PACKET_TYPE_BUSY) | \ 76 (1 << RXRPC_PACKET_TYPE_ABORT) | \ 77 (1 << RXRPC_PACKET_TYPE_ACKALL) | \ 78 (1 << RXRPC_PACKET_TYPE_CHALLENGE) | \ 79 (1 << RXRPC_PACKET_TYPE_RESPONSE) | \ 80 /*(1 << RXRPC_PACKET_TYPE_DEBUG) | */ \ 81 (1 << RXRPC_PACKET_TYPE_VERSION)) 82 83/*****************************************************************************/ 84/* 85 * jumbo packet secondary header 86 * - can be mapped to read header by: 87 * - new_serial = serial + 1 88 * - new_seq = seq + 1 89 * - new_flags = j_flags 90 * - new__rsvd = j__rsvd 91 * - duplicating all other fields 92 */ 93struct rxrpc_jumbo_header { 94 uint8_t flags; /* packet flags (as per rxrpc_header) */ 95 uint8_t pad; 96 union { 97 __be16 _rsvd; /* reserved */ 98 __be16 cksum; /* kerberos security checksum */ 99 }; 100}; 101 102#define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */ 103#define RXRPC_JUMBO_SUBPKTLEN (RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header)) 104 105/*****************************************************************************/ 106/* 107 * on-the-wire Rx ACK packet data payload 108 * - all multibyte fields should be in network byte order 109 */ 110struct rxrpc_ackpacket { 111 __be16 bufferSpace; /* number of packet buffers available */ 112 __be16 maxSkew; /* diff between serno being ACK'd and highest serial no 113 * received */ 114 __be32 firstPacket; /* sequence no of first ACK'd packet in attached list */ 115 __be32 previousPacket; /* sequence no of previous packet received */ 116 __be32 serial; /* serial no of packet that prompted this ACK */ 117 118 uint8_t reason; /* reason for ACK */ 119#define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */ 120#define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */ 121#define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */ 122#define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */ 123#define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */ 124#define RXRPC_ACK_PING 6 /* keep alive ACK */ 125#define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */ 126#define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */ 127#define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */ 128#define RXRPC_ACK__INVALID 10 /* Representation of invalid ACK reason */ 129 130 uint8_t nAcks; /* number of ACKs */ 131#define RXRPC_MAXACKS 255 132 133 uint8_t acks[0]; /* list of ACK/NAKs */ 134#define RXRPC_ACK_TYPE_NACK 0 135#define RXRPC_ACK_TYPE_ACK 1 136 137} __packed; 138 139/* Some ACKs refer to specific packets and some are general and can be updated. */ 140#define RXRPC_ACK_UPDATEABLE ((1 << RXRPC_ACK_REQUESTED) | \ 141 (1 << RXRPC_ACK_PING_RESPONSE) | \ 142 (1 << RXRPC_ACK_DELAY) | \ 143 (1 << RXRPC_ACK_IDLE)) 144 145 146/* 147 * ACK packets can have a further piece of information tagged on the end 148 */ 149struct rxrpc_ackinfo { 150 __be32 rxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */ 151 __be32 maxMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */ 152 __be32 rwind; /* Rx window size (packets) [AFS 3.4] */ 153 __be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */ 154}; 155 156/*****************************************************************************/ 157/* 158 * Kerberos security type-2 challenge packet 159 */ 160struct rxkad_challenge { 161 __be32 version; /* version of this challenge type */ 162 __be32 nonce; /* encrypted random number */ 163 __be32 min_level; /* minimum security level */ 164 __be32 __padding; /* padding to 8-byte boundary */ 165} __packed; 166 167/*****************************************************************************/ 168/* 169 * Kerberos security type-2 response packet 170 */ 171struct rxkad_response { 172 __be32 version; /* version of this response type */ 173 __be32 __pad; 174 175 /* encrypted bit of the response */ 176 struct { 177 __be32 epoch; /* current epoch */ 178 __be32 cid; /* parent connection ID */ 179 __be32 checksum; /* checksum */ 180 __be32 securityIndex; /* security type */ 181 __be32 call_id[4]; /* encrypted call IDs */ 182 __be32 inc_nonce; /* challenge nonce + 1 */ 183 __be32 level; /* desired level */ 184 } encrypted; 185 186 __be32 kvno; /* Kerberos key version number */ 187 __be32 ticket_len; /* Kerberos ticket length */ 188} __packed; 189 190#endif /* _LINUX_RXRPC_PACKET_H */ 191