include/rxrpc/packet.h

   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_N_PACKET_TYPES            9       /* 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         uint8_t         securityIndex;  /* security protocol ID */
  62         union {
  63                 __be16  _rsvd;          /* reserved */
  64                 __be16  cksum;          /* kerberos security checksum */
  65         };
  66         __be16          serviceId;      /* service ID */
  67
  68 } __packed;
  69
  70 #define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X)
  71
  72 extern const char *rxrpc_pkts[];
  73
  74 /*****************************************************************************/
  75 /*
  76  * jumbo packet secondary header
  77  * - can be mapped to read header by:
  78  *   - new_serial = serial + 1
  79  *   - new_seq = seq + 1
  80  *   - new_flags = j_flags
  81  *   - new__rsvd = j__rsvd
  82  *   - duplicating all other fields
  83  */
  84 struct rxrpc_jumbo_header {
  85         uint8_t         flags;          /* packet flags (as per rxrpc_header) */
  86         uint8_t         pad;
  87         __be16          _rsvd;          /* reserved (used by kerberos security as cksum) */
  88 };
  89
  90 #define RXRPC_JUMBO_DATALEN     1412    /* non-terminal jumbo packet data length */
  91
  92 /*****************************************************************************/
  93 /*
  94  * on-the-wire Rx ACK packet data payload
  95  * - all multibyte fields should be in network byte order
  96  */
  97 struct rxrpc_ackpacket {
  98         __be16          bufferSpace;    /* number of packet buffers available */
  99         __be16          maxSkew;        /* diff between serno being ACK'd and highest serial no
 100                                          * received */
 101         __be32          firstPacket;    /* sequence no of first ACK'd packet in attached list */
 102         __be32          previousPacket; /* sequence no of previous packet received */
 103         __be32          serial;         /* serial no of packet that prompted this ACK */
 104
 105         uint8_t         reason;         /* reason for ACK */
 106 #define RXRPC_ACK_REQUESTED             1       /* ACK was requested on packet */
 107 #define RXRPC_ACK_DUPLICATE             2       /* duplicate packet received */
 108 #define RXRPC_ACK_OUT_OF_SEQUENCE       3       /* out of sequence packet received */
 109 #define RXRPC_ACK_EXCEEDS_WINDOW        4       /* packet received beyond end of ACK window */
 110 #define RXRPC_ACK_NOSPACE               5       /* packet discarded due to lack of buffer space */
 111 #define RXRPC_ACK_PING                  6       /* keep alive ACK */
 112 #define RXRPC_ACK_PING_RESPONSE         7       /* response to RXRPC_ACK_PING */
 113 #define RXRPC_ACK_DELAY                 8       /* nothing happened since received packet */
 114 #define RXRPC_ACK_IDLE                  9       /* ACK due to fully received ACK window */
 115
 116         uint8_t         nAcks;          /* number of ACKs */
 117 #define RXRPC_MAXACKS   255
 118
 119         uint8_t         acks[0];        /* list of ACK/NAKs */
 120 #define RXRPC_ACK_TYPE_NACK             0
 121 #define RXRPC_ACK_TYPE_ACK              1
 122
 123 } __packed;
 124
 125 /*
 126  * ACK packets can have a further piece of information tagged on the end
 127  */
 128 struct rxrpc_ackinfo {
 129         __be32          rxMTU;          /* maximum Rx MTU size (bytes) [AFS 3.3] */
 130         __be32          maxMTU;         /* maximum interface MTU size (bytes) [AFS 3.3] */
 131         __be32          rwind;          /* Rx window size (packets) [AFS 3.4] */
 132         __be32          jumbo_max;      /* max packets to stick into a jumbo packet [AFS 3.5] */
 133 };
 134
 135 /*****************************************************************************/
 136 /*
 137  * Kerberos security type-2 challenge packet
 138  */
 139 struct rxkad_challenge {
 140         __be32          version;        /* version of this challenge type */
 141         __be32          nonce;          /* encrypted random number */
 142         __be32          min_level;      /* minimum security level */
 143         __be32          __padding;      /* padding to 8-byte boundary */
 144 } __packed;
 145
 146 /*****************************************************************************/
 147 /*
 148  * Kerberos security type-2 response packet
 149  */
 150 struct rxkad_response {
 151         __be32          version;        /* version of this response type */
 152         __be32          __pad;
 153
 154         /* encrypted bit of the response */
 155         struct {
 156                 __be32          epoch;          /* current epoch */
 157                 __be32          cid;            /* parent connection ID */
 158                 __be32          checksum;       /* checksum */
 159                 __be32          securityIndex;  /* security type */
 160                 __be32          call_id[4];     /* encrypted call IDs */
 161                 __be32          inc_nonce;      /* challenge nonce + 1 */
 162                 __be32          level;          /* desired level */
 163         } encrypted;
 164
 165         __be32          kvno;           /* Kerberos key version number */
 166         __be32          ticket_len;     /* Kerberos ticket length  */
 167 } __packed;
 168
 169 /*****************************************************************************/
 170 /*
 171  * RxRPC-level abort codes
 172  */
 173 #define RX_CALL_DEAD            -1      /* call/conn has been inactive and is shut down */
 174 #define RX_INVALID_OPERATION    -2      /* invalid operation requested / attempted */
 175 #define RX_CALL_TIMEOUT         -3      /* call timeout exceeded */
 176 #define RX_EOF                  -4      /* unexpected end of data on read op */
 177 #define RX_PROTOCOL_ERROR       -5      /* low-level protocol error */
 178 #define RX_USER_ABORT           -6      /* generic user abort */
 179 #define RX_ADDRINUSE            -7      /* UDP port in use */
 180 #define RX_DEBUGI_BADTYPE       -8      /* bad debugging packet type */
 181
 182 /*
 183  * (un)marshalling abort codes (rxgen)
 184  */
 185 #define RXGEN_CC_MARSHAL    -450
 186 #define RXGEN_CC_UNMARSHAL  -451
 187 #define RXGEN_SS_MARSHAL    -452
 188 #define RXGEN_SS_UNMARSHAL  -453
 189 #define RXGEN_DECODE        -454
 190 #define RXGEN_OPCODE        -455
 191 #define RXGEN_SS_XDRFREE    -456
 192 #define RXGEN_CC_XDRFREE    -457
 193
 194 /*
 195  * Rx kerberos security abort codes
 196  * - unfortunately we have no generalised security abort codes to say things
 197  *   like "unsupported security", so we have to use these instead and hope the
 198  *   other side understands
 199  */
 200 #define RXKADINCONSISTENCY      19270400        /* security module structure inconsistent */
 201 #define RXKADPACKETSHORT        19270401        /* packet too short for security challenge */
 202 #define RXKADLEVELFAIL          19270402        /* security level negotiation failed */
 203 #define RXKADTICKETLEN          19270403        /* ticket length too short or too long */
 204 #define RXKADOUTOFSEQUENCE      19270404        /* packet had bad sequence number */
 205 #define RXKADNOAUTH             19270405        /* caller not authorised */
 206 #define RXKADBADKEY             19270406        /* illegal key: bad parity or weak */
 207 #define RXKADBADTICKET          19270407        /* security object was passed a bad ticket */
 208 #define RXKADUNKNOWNKEY         19270408        /* ticket contained unknown key version number */
 209 #define RXKADEXPIRED            19270409        /* authentication expired */
 210 #define RXKADSEALEDINCON        19270410        /* sealed data inconsistent */
 211 #define RXKADDATALEN            19270411        /* user data too long */
 212 #define RXKADILLEGALLEVEL       19270412        /* caller not authorised to use encrypted conns */
 213
 214 #endif /* _LINUX_RXRPC_PACKET_H */