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[ipv4] Accept unicast packets for the local network broadcast address

The ISC Kea DHCP server transmits its DHCPOFFER as a unicast packet
with a broadcast IPv4 destination address (255.255.255.255).  This
combination is currently rejected by iPXE.

Fix by explicitly accepting the local network broadcast address
(255.255.255.255) as a valid unicast destination address.

Reported-by: Roy Ledochowski <roy.ledochowski@hpe.com>
Tested-by: Roy Ledochowski <roy.ledochowski@hpe.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 7 년 전
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  1. 1
    0
      src/net/ipv4.c

+ 1
- 0
src/net/ipv4.c 파일 보기

@@ -552,6 +552,7 @@ static int ipv4_rx ( struct io_buffer *iobuf,
552 552
 
553 553
 	/* Discard unicast packets not destined for us */
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 	if ( ( ! ( flags & LL_MULTICAST ) ) &&
555
+	     ( iphdr->dest.s_addr != INADDR_BROADCAST ) &&
555 556
 	     ipv4_has_any_addr ( netdev ) &&
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 	     ( ! ipv4_has_addr ( netdev, iphdr->dest ) ) ) {
557 558
 		DBGC ( iphdr->src, "IPv4 discarding non-local unicast packet "

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