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_wire_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 extern const char *rxrpc_pkts[];
  72
  73 #define RXRPC_SUPPORTED_PACKET_TYPES (                  \
  74                 (1 << RXRPC_PACKET_TYPE_DATA) |         \
  75                 (1 << RXRPC_PACKET_TYPE_ACK) |          \
  76                 (1 << RXRPC_PACKET_TYPE_BUSY) |         \
  77                 (1 << RXRPC_PACKET_TYPE_ABORT) |        \
  78                 (1 << RXRPC_PACKET_TYPE_ACKALL) |       \
  79                 (1 << RXRPC_PACKET_TYPE_CHALLENGE) |    \
  80                 (1 << RXRPC_PACKET_TYPE_RESPONSE) |     \
  81                 /*(1 << RXRPC_PACKET_TYPE_DEBUG) | */   \
  82                 (1 << RXRPC_PACKET_TYPE_VERSION))
  83
  84 /*****************************************************************************/
  85 /*
  86  * jumbo packet secondary header
  87  * - can be mapped to read header by:
  88  *   - new_serial = serial + 1
  89  *   - new_seq = seq + 1
  90  *   - new_flags = j_flags
  91  *   - new__rsvd = j__rsvd
  92  *   - duplicating all other fields
  93  */
  94 struct rxrpc_jumbo_header {
  95         uint8_t         flags;          /* packet flags (as per rxrpc_header) */
  96         uint8_t         pad;
  97         __be16          _rsvd;          /* reserved (used by kerberos security as cksum) */
  98 };
  99
 100 #define RXRPC_JUMBO_DATALEN     1412    /* non-terminal jumbo packet data length */
 101
 102 /*****************************************************************************/
 103 /*
 104  * on-the-wire Rx ACK packet data payload
 105  * - all multibyte fields should be in network byte order
 106  */
 107 struct rxrpc_ackpacket {
 108         __be16          bufferSpace;    /* number of packet buffers available */
 109         __be16          maxSkew;        /* diff between serno being ACK'd and highest serial no
 110                                          * received */
 111         __be32          firstPacket;    /* sequence no of first ACK'd packet in attached list */
 112         __be32          previousPacket; /* sequence no of previous packet received */
 113         __be32          serial;         /* serial no of packet that prompted this ACK */
 114
 115         uint8_t         reason;         /* reason for ACK */
 116 #define RXRPC_ACK_REQUESTED             1       /* ACK was requested on packet */
 117 #define RXRPC_ACK_DUPLICATE             2       /* duplicate packet received */
 118 #define RXRPC_ACK_OUT_OF_SEQUENCE       3       /* out of sequence packet received */
 119 #define RXRPC_ACK_EXCEEDS_WINDOW        4       /* packet received beyond end of ACK window */
 120 #define RXRPC_ACK_NOSPACE               5       /* packet discarded due to lack of buffer space */
 121 #define RXRPC_ACK_PING                  6       /* keep alive ACK */
 122 #define RXRPC_ACK_PING_RESPONSE         7       /* response to RXRPC_ACK_PING */
 123 #define RXRPC_ACK_DELAY                 8       /* nothing happened since received packet */
 124 #define RXRPC_ACK_IDLE                  9       /* ACK due to fully received ACK window */
 125
 126         uint8_t         nAcks;          /* number of ACKs */
 127 #define RXRPC_MAXACKS   255
 128
 129         uint8_t         acks[0];        /* list of ACK/NAKs */
 130 #define RXRPC_ACK_TYPE_NACK             0
 131 #define RXRPC_ACK_TYPE_ACK              1
 132
 133 } __packed;
 134
 135 /*
 136  * ACK packets can have a further piece of information tagged on the end
 137  */
 138 struct rxrpc_ackinfo {
 139         __be32          rxMTU;          /* maximum Rx MTU size (bytes) [AFS 3.3] */
 140         __be32          maxMTU;         /* maximum interface MTU size (bytes) [AFS 3.3] */
 141         __be32          rwind;          /* Rx window size (packets) [AFS 3.4] */
 142         __be32          jumbo_max;      /* max packets to stick into a jumbo packet [AFS 3.5] */
 143 };
 144
 145 /*****************************************************************************/
 146 /*
 147  * Kerberos security type-2 challenge packet
 148  */
 149 struct rxkad_challenge {
 150         __be32          version;        /* version of this challenge type */
 151         __be32          nonce;          /* encrypted random number */
 152         __be32          min_level;      /* minimum security level */
 153         __be32          __padding;      /* padding to 8-byte boundary */
 154 } __packed;
 155
 156 /*****************************************************************************/
 157 /*
 158  * Kerberos security type-2 response packet
 159  */
 160 struct rxkad_response {
 161         __be32          version;        /* version of this response type */
 162         __be32          __pad;
 163
 164         /* encrypted bit of the response */
 165         struct {
 166                 __be32          epoch;          /* current epoch */
 167                 __be32          cid;            /* parent connection ID */
 168                 __be32          checksum;       /* checksum */
 169                 __be32          securityIndex;  /* security type */
 170                 __be32          call_id[4];     /* encrypted call IDs */
 171                 __be32          inc_nonce;      /* challenge nonce + 1 */
 172                 __be32          level;          /* desired level */
 173         } encrypted;
 174
 175         __be32          kvno;           /* Kerberos key version number */
 176         __be32          ticket_len;     /* Kerberos ticket length  */
 177 } __packed;
 178
 179 /*****************************************************************************/
 180 /*
 181  * RxRPC-level abort codes
 182  */
 183 #define RX_CALL_DEAD            -1      /* call/conn has been inactive and is shut down */
 184 #define RX_INVALID_OPERATION    -2      /* invalid operation requested / attempted */
 185 #define RX_CALL_TIMEOUT         -3      /* call timeout exceeded */
 186 #define RX_EOF                  -4      /* unexpected end of data on read op */
 187 #define RX_PROTOCOL_ERROR       -5      /* low-level protocol error */
 188 #define RX_USER_ABORT           -6      /* generic user abort */
 189 #define RX_ADDRINUSE            -7      /* UDP port in use */
 190 #define RX_DEBUGI_BADTYPE       -8      /* bad debugging packet type */
 191
 192 /*
 193  * (un)marshalling abort codes (rxgen)
 194  */
 195 #define RXGEN_CC_MARSHAL    -450
 196 #define RXGEN_CC_UNMARSHAL  -451
 197 #define RXGEN_SS_MARSHAL    -452
 198 #define RXGEN_SS_UNMARSHAL  -453
 199 #define RXGEN_DECODE        -454
 200 #define RXGEN_OPCODE        -455
 201 #define RXGEN_SS_XDRFREE    -456
 202 #define RXGEN_CC_XDRFREE    -457
 203
 204 /*
 205  * Rx kerberos security abort codes
 206  * - unfortunately we have no generalised security abort codes to say things
 207  *   like "unsupported security", so we have to use these instead and hope the
 208  *   other side understands
 209  */
 210 #define RXKADINCONSISTENCY      19270400        /* security module structure inconsistent */
 211 #define RXKADPACKETSHORT        19270401        /* packet too short for security challenge */
 212 #define RXKADLEVELFAIL          19270402        /* security level negotiation failed */
 213 #define RXKADTICKETLEN          19270403        /* ticket length too short or too long */
 214 #define RXKADOUTOFSEQUENCE      19270404        /* packet had bad sequence number */
 215 #define RXKADNOAUTH             19270405        /* caller not authorised */
 216 #define RXKADBADKEY             19270406        /* illegal key: bad parity or weak */
 217 #define RXKADBADTICKET          19270407        /* security object was passed a bad ticket */
 218 #define RXKADUNKNOWNKEY         19270408        /* ticket contained unknown key version number */
 219 #define RXKADEXPIRED            19270409        /* authentication expired */
 220 #define RXKADSEALEDINCON        19270410        /* sealed data inconsistent */
 221 #define RXKADDATALEN            19270411        /* user data too long */
 222 #define RXKADILLEGALLEVEL       19270412        /* caller not authorised to use encrypted conns */
 223
 224 #endif /* _LINUX_RXRPC_PACKET_H */