base/inet.cc

   1 /*
   2  * Copyright (c) 2003 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sstream>
  30 #include <string>
  31
  32 #include "cprintf.hh"
  33 #include "host.hh"
  34 #include "inet.hh"
  35
  36 using namespace::std;
  37 string
  38 eaddr_string(const uint8_t a[6])
  39 {
  40     stringstream stream;
  41     ccprintf(stream, "%x:%x:%x:%x:%x:%x", a[0], a[1], a[2], a[3], a[4], a[5]);
  42
  43     return stream.str();
  44 }
  45
  46 /*
  47  * Copyright (c) 1988, 1992, 1993
  48  *      The Regents of the University of California.  All rights reserved.
  49  *
  50  * Redistribution and use in source and binary forms, with or without
  51  * modification, are permitted provided that the following conditions
  52  * are met:
  53  * 1. Redistributions of source code must retain the above copyright
  54  *    notice, this list of conditions and the following disclaimer.
  55  * 2. Redistributions in binary form must reproduce the above copyright
  56  *    notice, this list of conditions and the following disclaimer in the
  57  *    documentation and/or other materials provided with the distribution.
  58  * 3. All advertising materials mentioning features or use of this software
  59  *    must display the following acknowledgement:
  60  *      This product includes software developed by the University of
  61  *      California, Berkeley and its contributors.
  62  * 4. Neither the name of the University nor the names of its contributors
  63  *    may be used to endorse or promote products derived from this software
  64  *    without specific prior written permission.
  65  *
  66  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  67  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  68  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  69  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  70  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  71  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  72  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  73  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  74  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  75  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  76  * SUCH DAMAGE.
  77  */
  78 /***********************************************************************
  79                  This section of code taken from NetBSD
  80 ***********************************************************************/
  81
  82 #define ETHER_CRC_POLY_LE 0xedb88320
  83 #define ETHER_CRC_POLY_BE 0x04c11db6
  84
  85 #if 0
  86 /*
  87  * This is for reference.  We have a table-driven version
  88  * of the little-endian crc32 generator, which is faster
  89  * than the double-loop.
  90  */
  91 uint32_t
  92 crc32le(const uint8_t *buf, size_t len)
  93 {
  94     uint32_t c, crc, carry;
  95     size_t i, j;
  96
  97     crc = 0xffffffffU;      /* initial value */
  98
  99     for (i = 0; i < len; i++) {
 100         c = buf[i];
 101         for (j = 0; j < 8; j++) {
 102             carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
 103             crc >>= 1;
 104             c >>= 1;
 105             if (carry)
 106                 crc = (crc ^ ETHER_CRC_POLY_LE);
 107         }
 108     }
 109
 110     return (crc);
 111 }
 112 #else
 113 uint32_t
 114 crc32le(const uint8_t *buf, size_t len)
 115 {
 116     static const uint32_t crctab[] = {
 117         0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
 118         0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
 119         0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
 120         0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
 121     };
 122     uint32_t crc;
 123     int i;
 124
 125     crc = 0xffffffffU;      /* initial value */
 126
 127     for (i = 0; i < len; i++) {
 128         crc ^= buf[i];
 129         crc = (crc >> 4) ^ crctab[crc & 0xf];
 130         crc = (crc >> 4) ^ crctab[crc & 0xf];
 131     }
 132
 133     return (crc);
 134 }
 135 #endif
 136
 137 uint32_t
 138 crc32be(const uint8_t *buf, size_t len)
 139 {
 140     uint32_t c, crc, carry;
 141     size_t i, j;
 142
 143     crc = 0xffffffffU;      /* initial value */
 144
 145     for (i = 0; i < len; i++) {
 146         c = buf[i];
 147         for (j = 0; j < 8; j++) {
 148             carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
 149             crc <<= 1;
 150             c >>= 1;
 151             if (carry)
 152                 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
 153         }
 154     }
 155
 156     return (crc);
 157 }
 158
 159 /***********************************************************************
 160                  This is the end of the NetBSD code
 161 ***********************************************************************/