ethernet.c 1.4 KB

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  1. /* $Id$ */
  2. /*
  3. * Copyright (c) 2001-2010 Aaron Turner <aturner at synfin dot net>
  4. * Copyright (c) 2013-2017 Fred Klassen <tcpreplay at appneta dot com> - AppNeta
  5. *
  6. * The Tcpreplay Suite of tools is free software: you can redistribute it
  7. * and/or modify it under the terms of the GNU General Public License as
  8. * published by the Free Software Foundation, either version 3 of the
  9. * License, or with the authors permission any later version.
  10. *
  11. * The Tcpreplay Suite is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14. * GNU General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU General Public License
  17. * along with the Tcpreplay Suite. If not, see <http://www.gnu.org/licenses/>.
  18. */
  19. #include <assert.h>
  20. #include <string.h>
  21. #include "ethernet.h"
  22. /*
  23. * takes a ptr to an ethernet address and returns
  24. * 1 if it is unicast or 0 if it is multicast or
  25. * broadcast.
  26. */
  27. int
  28. is_unicast_ethernet(tcpeditdlt_t *ctx, const u_char *ether)
  29. {
  30. assert(ctx);
  31. assert(ether);
  32. /* is broadcast? */
  33. if (memcmp(ether, BROADCAST_MAC, ETHER_ADDR_LEN) == 0)
  34. return 0;
  35. /* Multicast addresses' leading octet are odd */
  36. if ((ether[0] & 0x01) == 0x01)
  37. return 0;
  38. /* everything else is unicast */
  39. return 1;
  40. }