IABSD.fr/src/sys/lib/libsa/ether.c

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• Author : miod
  Date : 2014-11-19 20:28:56
  Hash : 58567fe6
  Message : Sprinkle const whenever possible.

• sys/lib/libsa/ether.c

• /*	$OpenBSD: ether.c,v 1.10 2014/11/19 20:28:56 miod Exp $	*/
  /*	$NetBSD: ether.c,v 1.8 1996/10/13 02:29:00 christos Exp $	*/
  
  /*
   * Copyright (c) 1992 Regents of the University of California.
   * All rights reserved.
   *
   * This software was developed by the Computer Systems Engineering group
   * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   * contributed to Berkeley.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Lawrence Berkeley Laboratory and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
   */
  
  #include <sys/param.h>
  #include <sys/socket.h>
  
  #include <net/if.h>
  
  #include <netinet/in.h>
  #include <netinet/if_ether.h>
  #include <netinet/ip.h>
  
  #include "stand.h"
  #include "net.h"
  #include "netif.h"
  
  /* Caller must leave room for ethernet header in front!! */
  ssize_t
  sendether(struct iodesc *d, void *pkt, size_t len, u_char *dea, int etype)
  {
  	ssize_t n;
  	struct ether_header *eh;
  
  #ifdef ETHER_DEBUG
  	if (debug)
  		printf("sendether: called\n");
  #endif
  
  	eh = (struct ether_header *)pkt - 1;
  	len += sizeof(*eh);
  
  	MACPY(d->myea, eh->ether_shost);		/* by byte */
  	MACPY(dea, eh->ether_dhost);			/* by byte */
  	eh->ether_type = htons(etype);
  
  	n = netif_put(d, eh, len);
  	if (n < 0 || (size_t)n < sizeof(*eh))
  		return (-1);
  
  	n -= sizeof(*eh);
  	return (n);
  }
  
  /*
   * Get a packet of any Ethernet type, with our address or
   * the broadcast address.  Save the Ether type in arg 5.
   * NOTE: Caller must leave room for the Ether header.
   */
  ssize_t
  readether(struct iodesc *d, void *pkt, size_t len, time_t tleft,
      u_int16_t *etype)
  {
  	ssize_t n;
  	struct ether_header *eh;
  
  #ifdef ETHER_DEBUG
  	if (debug)
  		printf("readether: called\n");
  #endif
  
  	eh = (struct ether_header *)pkt - 1;
  	len += sizeof(*eh);
  
  	n = netif_get(d, eh, len, tleft);
  	if (n < 0 || (size_t)n < sizeof(*eh))
  		return (-1);
  
  	/* Validate Ethernet address. */
  	if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
  	    bcmp(bcea, eh->ether_dhost, 6) != 0) {
  #ifdef ETHER_DEBUG
  		if (debug)
  			printf("readether: not ours (ea=%s)\n",
  			    ether_sprintf(eh->ether_dhost));
  #endif
  		return (-1);
  	}
  	*etype = ntohs(eh->ether_type);
  
  	n -= sizeof(*eh);
  	return (n);
  }
  
  /*
   * Convert Ethernet address to printable (loggable) representation.
   */
  static const char digits[] = "0123456789abcdef";
  const char *
  ether_sprintf(const u_char *ap)
  {
  	int i;
  	static char etherbuf[18];
  	char *cp = etherbuf;
  
  	for (i = 0; i < 6; i++) {
  		*cp++ = digits[*ap >> 4];
  		*cp++ = digits[*ap++ & 0xf];
  		*cp++ = ':';
  	}
  	*--cp = 0;
  	return (etherbuf);
  }