libexec/rbootd/rmp_var.h

   1 /*
   2  * Copyright (c) 1988, 1992 The University of Utah and the Center
   3  *      for Software Science (CSS).
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * the Center for Software Science of the University of Utah Computer
   9  * Science Department.  CSS requests users of this software to return
  10  * to css-dist@cs.utah.edu any improvements that they make and grant
  11  * CSS redistribution rights.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *      from: @(#)rmp_var.h     8.1 (Berkeley) 6/4/93
  42  *
  43  * from: Utah Hdr: rmp_var.h 3.1 92/07/06
  44  * Author: Jeff Forys, University of Utah CSS
  45  */
  46
  47 /*
  48  *  Possible values for "rmp_type" fields.
  49  */
  50
  51 #define RMP_BOOT_REQ    1       /* boot request packet */
  52 #define RMP_BOOT_REPL   129     /* boot reply packet */
  53 #define RMP_READ_REQ    2       /* read request packet */
  54 #define RMP_READ_REPL   130     /* read reply packet */
  55 #define RMP_BOOT_DONE   3       /* boot complete packet */
  56
  57 /*
  58  *  Useful constants.
  59  */
  60
  61 #define RMP_VERSION     2       /* protocol version */
  62 #define RMP_TIMEOUT     600     /* timeout connection after ten minutes */
  63 #define RMP_PROBESID    0xffff  /* session ID for probes */
  64 #define RMP_HOSTLEN     13      /* max length of server's name */
  65 #define RMP_MACHLEN     20      /* length of machine type field */
  66
  67 /*
  68  *  RMP error codes
  69  */
  70
  71 #define RMP_E_OKAY      0
  72 #define RMP_E_EOF       2       /* read reply: returned end of file */
  73 #define RMP_E_ABORT     3       /* abort operation */
  74 #define RMP_E_BUSY      4       /* boot reply: server busy */
  75 #define RMP_E_TIMEOUT   5       /* lengthen time out (not implemented) */
  76 #define RMP_E_NOFILE    16      /* boot reply: file does not exist */
  77 #define RMP_E_OPENFILE  17      /* boot reply: file open failed */
  78 #define RMP_E_NODFLT    18      /* boot reply: default file does not exist */
  79 #define RMP_E_OPENDFLT  19      /* boot reply: default file open failed */
  80 #define RMP_E_BADSID    25      /* read reply: bad session ID */
  81 #define RMP_E_BADPACKET 27      /* Bad packet detected */
  82
  83 /*
  84  *  RMPDATALEN is the maximum number of data octets that can be stuffed
  85  *  into an RMP packet.  This excludes the 802.2 LLC w/HP extensions.
  86  */
  87 #define RMPDATALEN      (RMP_MAX_PACKET - (sizeof(struct hp_hdr) + \
  88                                            sizeof(struct hp_llc)))
  89
  90 /*
  91  *  Define sizes of packets we send.  Boot and Read replies are variable
  92  *  in length depending on the length of `s'.
  93  *
  94  *  Also, define how much space `restofpkt' can take up for outgoing
  95  *  Boot and Read replies.  Boot Request packets are effectively
  96  *  limited to 255 bytes due to the preceding 1-byte length field.
  97  */
  98
  99 #define RMPBOOTSIZE(s)  (sizeof(struct hp_hdr) + sizeof(struct hp_llc) + \
 100                          sizeof(struct rmp_boot_repl) + s - sizeof(restofpkt))
 101 #define RMPREADSIZE(s)  (sizeof(struct hp_hdr) + sizeof(struct hp_llc) + \
 102                          sizeof(struct rmp_read_repl) + s - sizeof(restofpkt) \
 103                          - sizeof(u_int8_t))
 104 #define RMPDONESIZE     (sizeof(struct hp_hdr) + sizeof(struct hp_llc) + \
 105                          sizeof(struct rmp_boot_done))
 106 #define RMPBOOTDATA     255
 107 #define RMPREADDATA     (RMPDATALEN - \
 108                          (2*sizeof(u_int8_t)+sizeof(u_int16_t)+sizeof(u_word)))
 109
 110 /*
 111  * This protocol defines some field sizes as "rest of ethernet packet".
 112  * There is no easy way to specify this in C, so we use a one character
 113  * field to denote it, and index past it to the end of the packet.
 114  */
 115
 116 typedef char    restofpkt;
 117
 118 /*
 119  * Due to the RMP packet layout, we'll run into alignment problems
 120  * on machines that can't access (or don't, by default, align) words
 121  * on half-word boundaries.  If you know that your machine does not suffer
 122  * from this problem, add it to the vax/tahoe/m68k #define below.
 123  *
 124  * The following macros are used to deal with this problem:
 125  *      WORDZE(w)       Return True if u_word `w' is zero, False otherwise.
 126  *      ZEROWORD(w)     Set u_word `w' to zero.
 127  *      COPYWORD(w1,w2) Copy u_word `w1' to `w2'.
 128  *      GETWORD(w,i)    Copy u_word `w' into int `i'.
 129  *      PUTWORD(i,w)    Copy int `i' into u_word `w'.
 130  *
 131  * N.B. Endianness is handled by use of ntohl/htonl
 132  */
 133 #if defined(__vax__) || defined(__tahoe__) || defined(__m68k__)
 134
 135 typedef u_int32_t       u_word;
 136
 137 #define WORDZE(w)       ((w) == 0)
 138 #define ZEROWORD(w)     (w) = 0
 139 #define COPYWORD(w1,w2) (w2) = (w1)
 140 #define GETWORD(w, i)   (i) = ntohl(w)
 141 #define PUTWORD(i, w)   (w) = htonl(i)
 142
 143 #else
 144
 145 #define _WORD_HIGHPART  0
 146 #define _WORD_LOWPART   1
 147
 148 typedef struct _uword { u_int16_t val[2]; }     u_word;
 149
 150 #define WORDZE(w) \
 151         ((w.val[_WORD_HIGHPART] == 0) && (w.val[_WORD_LOWPART] == 0))
 152 #define ZEROWORD(w) \
 153         (w).val[_WORD_HIGHPART] = (w).val[_WORD_LOWPART] = 0
 154 #define COPYWORD(w1, w2) \
 155         { (w2).val[_WORD_HIGHPART] = (w1).val[_WORD_HIGHPART]; \
 156           (w2).val[_WORD_LOWPART] = (w1).val[_WORD_LOWPART]; \
 157         }
 158 #define GETWORD(w, i) \
 159         (i) = (((u_int32_t)ntohs((w).val[_WORD_HIGHPART])) << 16) | ntohs((w).val[_WORD_LOWPART])
 160 #define PUTWORD(i, w) \
 161         { (w).val[_WORD_HIGHPART] = htons((u_int16_t) ((i >> 16) & 0xffff)); \
 162           (w).val[_WORD_LOWPART] = htons((u_int16_t) (i & 0xffff)); \
 163         }
 164
 165 #endif
 166
 167 /*
 168  * Packet structures.
 169  */
 170
 171 struct rmp_raw {                /* generic RMP packet */
 172         u_int8_t  rmp_type;             /* packet type */
 173         u_int8_t  rmp_rawdata[RMPDATALEN-1];
 174 };
 175
 176 struct rmp_boot_req {           /* boot request */
 177         u_int8_t  rmp_type;             /* packet type (RMP_BOOT_REQ) */
 178         u_int8_t  rmp_retcode;          /* return code (0) */
 179         u_word    rmp_seqno;            /* sequence number (real time clock) */
 180         u_int16_t rmp_session;          /* session id (normally 0) */
 181         u_int16_t rmp_version;          /* protocol version (RMP_VERSION) */
 182         char      rmp_machtype[RMP_MACHLEN];    /* machine type */
 183         u_int8_t  rmp_flnmsize;         /* length of rmp_flnm */
 184         restofpkt rmp_flnm;             /* name of file to be read */
 185 };
 186
 187 struct rmp_boot_repl {          /* boot reply */
 188         u_int8_t  rmp_type;             /* packet type (RMP_BOOT_REPL) */
 189         u_int8_t  rmp_retcode;          /* return code (normally 0) */
 190         u_word    rmp_seqno;            /* sequence number (from boot req) */
 191         u_int16_t rmp_session;          /* session id (generated) */
 192         u_int16_t rmp_version;          /* protocol version (RMP_VERSION) */
 193         u_int8_t  rmp_flnmsize;         /* length of rmp_flnm */
 194         restofpkt rmp_flnm;             /* name of file (from boot req) */
 195 };
 196
 197 struct rmp_read_req {           /* read request */
 198         u_int8_t  rmp_type;             /* packet type (RMP_READ_REQ) */
 199         u_int8_t  rmp_retcode;          /* return code (0) */
 200         u_word    rmp_offset;           /* file relative byte offset */
 201         u_int16_t rmp_session;          /* session id (from boot repl) */
 202         u_int16_t rmp_size;             /* max no of bytes to send */
 203 };
 204
 205 struct rmp_read_repl {          /* read reply */
 206         u_int8_t  rmp_type;             /* packet type (RMP_READ_REPL) */
 207         u_int8_t  rmp_retcode;          /* return code (normally 0) */
 208         u_word    rmp_offset;           /* byte offset (from read req) */
 209         u_int16_t rmp_session;          /* session id (from read req) */
 210         restofpkt rmp_data;             /* data (max size from read req) */
 211         u_int8_t  rmp_unused;           /* padding to 16-bit boundary */
 212 };
 213
 214 struct rmp_boot_done {          /* boot complete */
 215         u_int8_t  rmp_type;             /* packet type (RMP_BOOT_DONE) */
 216         u_int8_t  rmp_retcode;          /* return code (0) */
 217         u_word    rmp_unused;           /* not used (0) */
 218         u_int16_t rmp_session;          /* session id (from read repl) */
 219 };
 220
 221 struct rmp_packet {
 222         struct hp_hdr hp_hdr;
 223         struct hp_llc hp_llc;
 224         union {
 225                 struct rmp_boot_req     rmp_brq;        /* boot request */
 226                 struct rmp_boot_repl    rmp_brpl;       /* boot reply */
 227                 struct rmp_read_req     rmp_rrq;        /* read request */
 228                 struct rmp_read_repl    rmp_rrpl;       /* read reply */
 229                 struct rmp_boot_done    rmp_done;       /* boot complete */
 230                 struct rmp_raw          rmp_raw;        /* raw data */
 231         } rmp_proto;
 232 };
 233
 234 /*
 235  *  Make life easier...
 236  */
 237
 238 #define r_type  rmp_proto.rmp_raw.rmp_type
 239 #define r_data  rmp_proto.rmp_raw.rmp_rawdata
 240 #define r_brq   rmp_proto.rmp_brq
 241 #define r_brpl  rmp_proto.rmp_brpl
 242 #define r_rrq   rmp_proto.rmp_rrq
 243 #define r_rrpl  rmp_proto.rmp_rrpl
 244 #define r_done  rmp_proto.rmp_done