packet.h 5.0 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127
  1. /* packet.h: Rx packet layout and definitions
  2. *
  3. * Copyright (C) 2002 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. #ifndef _LINUX_RXRPC_PACKET_H
  12. #define _LINUX_RXRPC_PACKET_H
  13. #include <rxrpc/types.h>
  14. #define RXRPC_IPUDP_SIZE 28
  15. extern size_t RXRPC_MAX_PACKET_SIZE;
  16. #define RXRPC_MAX_PACKET_DATA_SIZE (RXRPC_MAX_PACKET_SIZE - sizeof(struct rxrpc_header))
  17. #define RXRPC_LOCAL_PACKET_SIZE RXRPC_MAX_PACKET_SIZE
  18. #define RXRPC_REMOTE_PACKET_SIZE (576 - RXRPC_IPUDP_SIZE)
  19. /*****************************************************************************/
  20. /*
  21. * on-the-wire Rx packet header
  22. * - all multibyte fields should be in network byte order
  23. */
  24. struct rxrpc_header
  25. {
  26. __be32 epoch; /* client boot timestamp */
  27. __be32 cid; /* connection and channel ID */
  28. #define RXRPC_MAXCALLS 4 /* max active calls per conn */
  29. #define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */
  30. #define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */
  31. #define RXRPC_CIDSHIFT 2 /* shift for connection ID */
  32. __be32 callNumber; /* call ID (0 for connection-level packets) */
  33. #define RXRPC_PROCESS_MAXCALLS (1<<2) /* maximum number of active calls per conn (power of 2) */
  34. __be32 seq; /* sequence number of pkt in call stream */
  35. __be32 serial; /* serial number of pkt sent to network */
  36. uint8_t type; /* packet type */
  37. #define RXRPC_PACKET_TYPE_DATA 1 /* data */
  38. #define RXRPC_PACKET_TYPE_ACK 2 /* ACK */
  39. #define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */
  40. #define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */
  41. #define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */
  42. #define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */
  43. #define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */
  44. #define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */
  45. #define RXRPC_N_PACKET_TYPES 9 /* number of packet types (incl type 0) */
  46. uint8_t flags; /* packet flags */
  47. #define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */
  48. #define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */
  49. #define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */
  50. #define RXRPC_MORE_PACKETS 0x08 /* more packets to come */
  51. #define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */
  52. #define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */
  53. uint8_t userStatus; /* app-layer defined status */
  54. uint8_t securityIndex; /* security protocol ID */
  55. __be16 _rsvd; /* reserved (used by kerberos security as cksum) */
  56. __be16 serviceId; /* service ID */
  57. } __attribute__((packed));
  58. #define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X)
  59. extern const char *rxrpc_pkts[];
  60. /*****************************************************************************/
  61. /*
  62. * jumbo packet secondary header
  63. * - can be mapped to read header by:
  64. * - new_serial = serial + 1
  65. * - new_seq = seq + 1
  66. * - new_flags = j_flags
  67. * - new__rsvd = j__rsvd
  68. * - duplicating all other fields
  69. */
  70. struct rxrpc_jumbo_header
  71. {
  72. uint8_t flags; /* packet flags (as per rxrpc_header) */
  73. uint8_t pad;
  74. __be16 _rsvd; /* reserved (used by kerberos security as cksum) */
  75. };
  76. #define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */
  77. /*****************************************************************************/
  78. /*
  79. * on-the-wire Rx ACK packet data payload
  80. * - all multibyte fields should be in network byte order
  81. */
  82. struct rxrpc_ackpacket
  83. {
  84. __be16 bufferSpace; /* number of packet buffers available */
  85. __be16 maxSkew; /* diff between serno being ACK'd and highest serial no
  86. * received */
  87. __be32 firstPacket; /* sequence no of first ACK'd packet in attached list */
  88. __be32 previousPacket; /* sequence no of previous packet received */
  89. __be32 serial; /* serial no of packet that prompted this ACK */
  90. uint8_t reason; /* reason for ACK */
  91. #define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */
  92. #define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */
  93. #define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */
  94. #define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */
  95. #define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */
  96. #define RXRPC_ACK_PING 6 /* keep alive ACK */
  97. #define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */
  98. #define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */
  99. #define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */
  100. uint8_t nAcks; /* number of ACKs */
  101. #define RXRPC_MAXACKS 255
  102. uint8_t acks[0]; /* list of ACK/NAKs */
  103. #define RXRPC_ACK_TYPE_NACK 0
  104. #define RXRPC_ACK_TYPE_ACK 1
  105. } __attribute__((packed));
  106. #endif /* _LINUX_RXRPC_PACKET_H */