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- Initialize ifp->if_baudrate to a sensible value when the interface is

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attached.
- Add ether_crc32_be() and ether_crc_le(), common functions for computing
  the Ethernet CRC on arbitrary length buffers.  Nothing uses them yet,
  and these should be double-checked and probably re-implemented as
  table-driven functions.
This commit is contained in:
thorpej 2000-03-06 20:54:41 +00:00
parent c2c2f491bc
commit b99cf790df
2 changed files with 61 additions and 3 deletions
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13
sys/net/if_ether.h
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@ -1,4 +1,4 @@
/* $NetBSD: if_ether.h,v 1.13 1999/11/19 20:41:19 thorpej Exp $ */
/* $NetBSD: if_ether.h,v 1.14 2000/03/06 20:54:41 thorpej Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
@ -72,6 +72,12 @@ struct ether_header {
#define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
#define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
/*
* Ethernet CRC32 polynomials (big- and little-endian verions).
*/
#define ETHER_CRC_POLY_LE 0xedb88320
#define ETHER_CRC_POLY_BE 0x04c11db6
#ifndef _STANDALONE
/*
@ -198,10 +204,13 @@ struct ether_multistep {
ETHER_NEXT_MULTI((step), (enm)); \
}
#ifdef _KERNEL
u_int32_t ether_crc32_le __P((const u_int8_t *, size_t));
u_int32_t ether_crc32_be __P((const u_int8_t *, size_t));
#else
/*
* Prototype ethers(3) functions.
*/
#ifndef _KERNEL
#include <sys/cdefs.h>
__BEGIN_DECLS
char * ether_ntoa __P((struct ether_addr *));

51
sys/net/if_ethersubr.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_ethersubr.c,v 1.52 2000/02/01 22:52:05 thorpej Exp $ */
/* $NetBSD: if_ethersubr.c,v 1.53 2000/03/06 20:54:41 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -770,6 +770,7 @@ ether_ifattach(ifp, lla)
ifp->if_mtu = ETHERMTU;
ifp->if_output = ether_output;
ifp->if_input = ether_input;
ifp->if_baudrate = IF_Mbps(10); /* just a default */
if ((sdl = ifp->if_sadl) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_type = IFT_ETHER;
@ -791,6 +792,54 @@ ether_ifdetach(ifp)
/* Nothing. */
}
u_int32_t
ether_crc32_le(buf, len)
const u_int8_t *buf;
size_t len;
{
u_int32_t c, crc, carry;
size_t i, j;
crc = 0xffffffffU; /* initial value */
for (i = 0; i < len; i++) {
c = buf[i];
for (j = 0; j < 8; j++) {
carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
crc >>= 1;
c >>= 1;
if (carry)
crc = (crc ^ ETHER_CRC_POLY_LE) | carry;
}
}
return (crc);
}
u_int32_t
ether_crc32_be(buf, len)
const u_int8_t *buf;
size_t len;
{
u_int32_t c, crc, carry;
size_t i, j;
crc = 0xffffffffU; /* initial value */
for (i = 0; i < len; i++) {
c = buf[i];
for (j = 0; j < 8; j++) {
carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
crc <<= 1;
c >>= 1;
if (carry)
crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
}
}
return (crc);
}
#ifdef INET
u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };