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 15 typedef u32 rxrpc_seq_t; /* Rx message sequence number */ 16 typedef u32 rxrpc_serial_t; /* Rx message serial number */ 17 typedef __be32 rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */ 18 typedef __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 */ 25 struct rxrpc_header { 26 __be32 epoch; /* client boot timestamp */ 27 28 __be32 cid; /* connection and channel ID */ 29 #define RXRPC_MAXCALLS 4 /* max active calls per conn */ 30 #define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */ 31 #define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */ 32 #define RXRPC_CIDSHIFT ilog2(RXRPC_MAXCALLS) /* shift for connection ID */ 33 #define RXRPC_CID_INC (1 << RXRPC_CIDSHIFT) /* connection ID increment */ 34 35 __be32 callNumber; /* call ID (0 for connection-level packets) */ 36 #define RXRPC_PROCESS_MAXCALLS (1<<2) /* maximum number of active calls per conn (power of 2) */ 37 38 __be32 seq; /* sequence number of pkt in call stream */ 39 __be32 serial; /* serial number of pkt sent to network */ 40 41 uint8_t type; /* packet type */ 42 #define RXRPC_PACKET_TYPE_DATA 1 /* data */ 43 #define RXRPC_PACKET_TYPE_ACK 2 /* ACK */ 44 #define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */ 45 #define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */ 46 #define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */ 47 #define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */ 48 #define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */ 49 #define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */ 50 #define RXRPC_PACKET_TYPE_VERSION 13 /* version string request */ 51 #define RXRPC_N_PACKET_TYPES 14 /* number of packet types (incl type 0) */ 52 53 uint8_t flags; /* packet flags */ 54 #define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */ 55 #define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */ 56 #define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */ 57 #define RXRPC_MORE_PACKETS 0x08 /* more packets to come */ 58 #define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */ 59 #define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */ 60 61 uint8_t userStatus; /* app-layer defined status */ 62 uint8_t securityIndex; /* security protocol ID */ 63 union { 64 __be16 _rsvd; /* reserved */ 65 __be16 cksum; /* kerberos security checksum */ 66 }; 67 __be16 serviceId; /* service ID */ 68 69 } __packed; 70 71 #define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X) 72 73 extern const char *rxrpc_pkts[]; 74 75 /*****************************************************************************/ 76 /* 77 * jumbo packet secondary header 78 * - can be mapped to read header by: 79 * - new_serial = serial + 1 80 * - new_seq = seq + 1 81 * - new_flags = j_flags 82 * - new__rsvd = j__rsvd 83 * - duplicating all other fields 84 */ 85 struct rxrpc_jumbo_header { 86 uint8_t flags; /* packet flags (as per rxrpc_header) */ 87 uint8_t pad; 88 __be16 _rsvd; /* reserved (used by kerberos security as cksum) */ 89 }; 90 91 #define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */ 92 93 /*****************************************************************************/ 94 /* 95 * on-the-wire Rx ACK packet data payload 96 * - all multibyte fields should be in network byte order 97 */ 98 struct rxrpc_ackpacket { 99 __be16 bufferSpace; /* number of packet buffers available */ 100 __be16 maxSkew; /* diff between serno being ACK'd and highest serial no 101 * received */ 102 __be32 firstPacket; /* sequence no of first ACK'd packet in attached list */ 103 __be32 previousPacket; /* sequence no of previous packet received */ 104 __be32 serial; /* serial no of packet that prompted this ACK */ 105 106 uint8_t reason; /* reason for ACK */ 107 #define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */ 108 #define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */ 109 #define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */ 110 #define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */ 111 #define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */ 112 #define RXRPC_ACK_PING 6 /* keep alive ACK */ 113 #define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */ 114 #define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */ 115 #define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */ 116 117 uint8_t nAcks; /* number of ACKs */ 118 #define RXRPC_MAXACKS 255 119 120 uint8_t acks[0]; /* list of ACK/NAKs */ 121 #define RXRPC_ACK_TYPE_NACK 0 122 #define RXRPC_ACK_TYPE_ACK 1 123 124 } __packed; 125 126 /* 127 * ACK packets can have a further piece of information tagged on the end 128 */ 129 struct rxrpc_ackinfo { 130 __be32 rxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */ 131 __be32 maxMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */ 132 __be32 rwind; /* Rx window size (packets) [AFS 3.4] */ 133 __be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */ 134 }; 135 136 /*****************************************************************************/ 137 /* 138 * Kerberos security type-2 challenge packet 139 */ 140 struct rxkad_challenge { 141 __be32 version; /* version of this challenge type */ 142 __be32 nonce; /* encrypted random number */ 143 __be32 min_level; /* minimum security level */ 144 __be32 __padding; /* padding to 8-byte boundary */ 145 } __packed; 146 147 /*****************************************************************************/ 148 /* 149 * Kerberos security type-2 response packet 150 */ 151 struct rxkad_response { 152 __be32 version; /* version of this response type */ 153 __be32 __pad; 154 155 /* encrypted bit of the response */ 156 struct { 157 __be32 epoch; /* current epoch */ 158 __be32 cid; /* parent connection ID */ 159 __be32 checksum; /* checksum */ 160 __be32 securityIndex; /* security type */ 161 __be32 call_id[4]; /* encrypted call IDs */ 162 __be32 inc_nonce; /* challenge nonce + 1 */ 163 __be32 level; /* desired level */ 164 } encrypted; 165 166 __be32 kvno; /* Kerberos key version number */ 167 __be32 ticket_len; /* Kerberos ticket length */ 168 } __packed; 169 170 /*****************************************************************************/ 171 /* 172 * RxRPC-level abort codes 173 */ 174 #define RX_CALL_DEAD -1 /* call/conn has been inactive and is shut down */ 175 #define RX_INVALID_OPERATION -2 /* invalid operation requested / attempted */ 176 #define RX_CALL_TIMEOUT -3 /* call timeout exceeded */ 177 #define RX_EOF -4 /* unexpected end of data on read op */ 178 #define RX_PROTOCOL_ERROR -5 /* low-level protocol error */ 179 #define RX_USER_ABORT -6 /* generic user abort */ 180 #define RX_ADDRINUSE -7 /* UDP port in use */ 181 #define RX_DEBUGI_BADTYPE -8 /* bad debugging packet type */ 182 183 /* 184 * (un)marshalling abort codes (rxgen) 185 */ 186 #define RXGEN_CC_MARSHAL -450 187 #define RXGEN_CC_UNMARSHAL -451 188 #define RXGEN_SS_MARSHAL -452 189 #define RXGEN_SS_UNMARSHAL -453 190 #define RXGEN_DECODE -454 191 #define RXGEN_OPCODE -455 192 #define RXGEN_SS_XDRFREE -456 193 #define RXGEN_CC_XDRFREE -457 194 195 /* 196 * Rx kerberos security abort codes 197 * - unfortunately we have no generalised security abort codes to say things 198 * like "unsupported security", so we have to use these instead and hope the 199 * other side understands 200 */ 201 #define RXKADINCONSISTENCY 19270400 /* security module structure inconsistent */ 202 #define RXKADPACKETSHORT 19270401 /* packet too short for security challenge */ 203 #define RXKADLEVELFAIL 19270402 /* security level negotiation failed */ 204 #define RXKADTICKETLEN 19270403 /* ticket length too short or too long */ 205 #define RXKADOUTOFSEQUENCE 19270404 /* packet had bad sequence number */ 206 #define RXKADNOAUTH 19270405 /* caller not authorised */ 207 #define RXKADBADKEY 19270406 /* illegal key: bad parity or weak */ 208 #define RXKADBADTICKET 19270407 /* security object was passed a bad ticket */ 209 #define RXKADUNKNOWNKEY 19270408 /* ticket contained unknown key version number */ 210 #define RXKADEXPIRED 19270409 /* authentication expired */ 211 #define RXKADSEALEDINCON 19270410 /* sealed data inconsistent */ 212 #define RXKADDATALEN 19270411 /* user data too long */ 213 #define RXKADILLEGALLEVEL 19270412 /* caller not authorised to use encrypted conns */ 214 215 #endif /* _LINUX_RXRPC_PACKET_H */ 216