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net/arp/arp_out.c: Fix IGMP Ethernet address computation

This commit is contained in:
Louis Mayencourt 2017-09-28 07:22:58 -06:00 committed by Gregory Nutt
parent ef059f78ac
commit b55005669a
1 changed files with 12 additions and 5 deletions
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17
net/arp/arp_out.c
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@ -1,7 +1,7 @@
/****************************************************************************
* net/arp/arp_out.c
*
* Copyright (C) 2007-2011, 2014-2015 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2011, 2014-2015, 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Based on uIP which also has a BSD style license:
@ -186,12 +186,19 @@ void arp_out(FAR struct net_driver_s *dev)
{
/* Build the well-known IPv4 IGMP Ethernet address. The first
* three bytes are fixed; the final three variable come from the
* last three bytes of the IP address.
* last three bytes of the IPv4 address (network order).
*
* Address range : 01:00:5e:00:00:00 to 01:00:5e:7f:ff:ff
*/
FAR const uint8_t *ip = ((FAR uint8_t *)pip->eh_destipaddr) + 1;
memcpy(peth->dest, g_multicast_ethaddr, 3);
memcpy(&peth->dest[3], ip, 3);
FAR const uint8_t *ip = (FAR uint8_t *)pip->eh_destipaddr;
peth->dest[0] = g_multicast_ethaddr[0];
peth->dest[1] = g_multicast_ethaddr[1];
peth->dest[2] = g_multicast_ethaddr[2];
peth->dest[3] = ip[2] & 0x7f;
peth->dest[4] = ip[3];
peth->dest[5] = ip[4];
}
#endif
else