* Fixed a bug in deciding whether or not an IP level broadcast should be

accepted. This should have been the reason for Duggan's problem with DHCP
  as part of bug #6454.
* Stippi's router seems to answer DHCP requests with broadcasts to the future
  broadcast IP address. Luckily, it's also a link layer broadcast, so we let
  the upper protocols decide what to do with it, depending on that; this could
  also be done depending on the existence of any unconfigured networks.
* This should fix Stippi's DHCP problems, and therefore bug #6454 - in any
  case, this will be the last try before my vacation :-)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38450 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/network/protocols/ipv4/ipv4.cpp

@@ -1604,7 +1604,7 @@ ipv4_receive_data(net_buffer* buffer)
 		// Find first interface with a matching family
 		if (!sDatalinkModule->is_local_link_address(sDomain, true,
 				buffer->destination, &buffer->interface_address))
-			notForUs = wasMulticast;
+			notForUs = !wasMulticast;
 	} else if (IN_MULTICAST(ntohl(header.destination))) {
 		buffer->flags |= MSG_MCAST;
 	} else {
@@ -1615,7 +1615,12 @@ ipv4_receive_data(net_buffer* buffer)
 				&buffer->interface_address, &matchedAddressType)
 			&& !sDatalinkModule->is_local_link_address(sDomain, true,
 				buffer->destination, &buffer->interface_address)) {
-			notForUs = true;
+			// if the buffer was a link layer multicast, regard it as a
+			// broadcast, and let the upper levels decide what to do with it
+			if (wasMulticast)
+				buffer->flags |= MSG_BCAST;
+			else
+				notForUs = true;
 		} else {
 			// copy over special address types (MSG_BCAST or MSG_MCAST):
 			buffer->flags |= matchedAddressType;