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_PARAMS        9       /* Parameter negotiation (unspec'd, ignore) */
  50 #define RXRPC_PACKET_TYPE_10            10      /* Ignored */
  51 #define RXRPC_PACKET_TYPE_11            11      /* Ignored */
  52 #define RXRPC_PACKET_TYPE_VERSION       13      /* version string request */
  53 #define RXRPC_N_PACKET_TYPES            14      /* number of packet types (incl type 0) */
  54
  55         uint8_t         flags;          /* packet flags */
  56 #define RXRPC_CLIENT_INITIATED  0x01            /* signifies a packet generated by a client */
  57 #define RXRPC_REQUEST_ACK       0x02            /* request an unconditional ACK of this packet */
  58 #define RXRPC_LAST_PACKET       0x04            /* the last packet from this side for this call */
  59 #define RXRPC_MORE_PACKETS      0x08            /* more packets to come */
  60 #define RXRPC_JUMBO_PACKET      0x20            /* [DATA] this is a jumbo packet */
  61 #define RXRPC_SLOW_START_OK     0x20            /* [ACK] slow start supported */
  62
  63         uint8_t         userStatus;     /* app-layer defined status */
  64 #define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01   /* AuriStor service upgrade request */
  65
  66         uint8_t         securityIndex;  /* security protocol ID */
  67         union {
  68                 __be16  _rsvd;          /* reserved */
  69                 __be16  cksum;          /* kerberos security checksum */
  70         };
  71         __be16          serviceId;      /* service ID */
  72
  73 } __packed;
  74
  75 #define RXRPC_SUPPORTED_PACKET_TYPES (                  \
  76                 (1 << RXRPC_PACKET_TYPE_DATA) |         \
  77                 (1 << RXRPC_PACKET_TYPE_ACK) |          \
  78                 (1 << RXRPC_PACKET_TYPE_BUSY) |         \
  79                 (1 << RXRPC_PACKET_TYPE_ABORT) |        \
  80                 (1 << RXRPC_PACKET_TYPE_ACKALL) |       \
  81                 (1 << RXRPC_PACKET_TYPE_CHALLENGE) |    \
  82                 (1 << RXRPC_PACKET_TYPE_RESPONSE) |     \
  83                 /*(1 << RXRPC_PACKET_TYPE_DEBUG) | */   \
  84                 (1 << RXRPC_PACKET_TYPE_PARAMS) |       \
  85                 (1 << RXRPC_PACKET_TYPE_10) |           \
  86                 (1 << RXRPC_PACKET_TYPE_11) |           \
  87                 (1 << RXRPC_PACKET_TYPE_VERSION))
  88
  89 /*****************************************************************************/
  90 /*
  91  * jumbo packet secondary header
  92  * - can be mapped to read header by:
  93  *   - new_serial = serial + 1
  94  *   - new_seq = seq + 1
  95  *   - new_flags = j_flags
  96  *   - new__rsvd = j__rsvd
  97  *   - duplicating all other fields
  98  */
  99 struct rxrpc_jumbo_header {
 100         uint8_t         flags;          /* packet flags (as per rxrpc_header) */
 101         uint8_t         pad;
 102         union {
 103                 __be16  _rsvd;          /* reserved */
 104                 __be16  cksum;          /* kerberos security checksum */
 105         };
 106 };
 107
 108 #define RXRPC_JUMBO_DATALEN     1412    /* non-terminal jumbo packet data length */
 109 #define RXRPC_JUMBO_SUBPKTLEN   (RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
 110
 111 /*****************************************************************************/
 112 /*
 113  * on-the-wire Rx ACK packet data payload
 114  * - all multibyte fields should be in network byte order
 115  */
 116 struct rxrpc_ackpacket {
 117         __be16          bufferSpace;    /* number of packet buffers available */
 118         __be16          maxSkew;        /* diff between serno being ACK'd and highest serial no
 119                                          * received */
 120         __be32          firstPacket;    /* sequence no of first ACK'd packet in attached list */
 121         __be32          previousPacket; /* sequence no of previous packet received */
 122         __be32          serial;         /* serial no of packet that prompted this ACK */
 123
 124         uint8_t         reason;         /* reason for ACK */
 125 #define RXRPC_ACK_REQUESTED             1       /* ACK was requested on packet */
 126 #define RXRPC_ACK_DUPLICATE             2       /* duplicate packet received */
 127 #define RXRPC_ACK_OUT_OF_SEQUENCE       3       /* out of sequence packet received */
 128 #define RXRPC_ACK_EXCEEDS_WINDOW        4       /* packet received beyond end of ACK window */
 129 #define RXRPC_ACK_NOSPACE               5       /* packet discarded due to lack of buffer space */
 130 #define RXRPC_ACK_PING                  6       /* keep alive ACK */
 131 #define RXRPC_ACK_PING_RESPONSE         7       /* response to RXRPC_ACK_PING */
 132 #define RXRPC_ACK_DELAY                 8       /* nothing happened since received packet */
 133 #define RXRPC_ACK_IDLE                  9       /* ACK due to fully received ACK window */
 134 #define RXRPC_ACK__INVALID              10      /* Representation of invalid ACK reason */
 135
 136         uint8_t         nAcks;          /* number of ACKs */
 137 #define RXRPC_MAXACKS   255
 138
 139         uint8_t         acks[0];        /* list of ACK/NAKs */
 140 #define RXRPC_ACK_TYPE_NACK             0
 141 #define RXRPC_ACK_TYPE_ACK              1
 142
 143 } __packed;
 144
 145 /* Some ACKs refer to specific packets and some are general and can be updated. */
 146 #define RXRPC_ACK_UPDATEABLE ((1 << RXRPC_ACK_REQUESTED)        |       \
 147                               (1 << RXRPC_ACK_PING_RESPONSE)    |       \
 148                               (1 << RXRPC_ACK_DELAY)            |       \
 149                               (1 << RXRPC_ACK_IDLE))
 150
 151
 152 /*
 153  * ACK packets can have a further piece of information tagged on the end
 154  */
 155 struct rxrpc_ackinfo {
 156         __be32          rxMTU;          /* maximum Rx MTU size (bytes) [AFS 3.3] */
 157         __be32          maxMTU;         /* maximum interface MTU size (bytes) [AFS 3.3] */
 158         __be32          rwind;          /* Rx window size (packets) [AFS 3.4] */
 159         __be32          jumbo_max;      /* max packets to stick into a jumbo packet [AFS 3.5] */
 160 };
 161
 162 /*****************************************************************************/
 163 /*
 164  * Kerberos security type-2 challenge packet
 165  */
 166 struct rxkad_challenge {
 167         __be32          version;        /* version of this challenge type */
 168         __be32          nonce;          /* encrypted random number */
 169         __be32          min_level;      /* minimum security level */
 170         __be32          __padding;      /* padding to 8-byte boundary */
 171 } __packed;
 172
 173 /*****************************************************************************/
 174 /*
 175  * Kerberos security type-2 response packet
 176  */
 177 struct rxkad_response {
 178         __be32          version;        /* version of this response type */
 179         __be32          __pad;
 180
 181         /* encrypted bit of the response */
 182         struct {
 183                 __be32          epoch;          /* current epoch */
 184                 __be32          cid;            /* parent connection ID */
 185                 __be32          checksum;       /* checksum */
 186                 __be32          securityIndex;  /* security type */
 187                 __be32          call_id[4];     /* encrypted call IDs */
 188                 __be32          inc_nonce;      /* challenge nonce + 1 */
 189                 __be32          level;          /* desired level */
 190         } encrypted;
 191
 192         __be32          kvno;           /* Kerberos key version number */
 193         __be32          ticket_len;     /* Kerberos ticket length  */
 194 } __packed;
 195
 196 #endif /* _LINUX_RXRPC_PACKET_H */