net/rxrpc/protocol.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 #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  */
  93 struct 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  */
 110 struct 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  */
 149 struct 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  */
 160 struct 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  */
 171 struct 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 */