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[cachedhcp] Include VLAN tag in filter for applying cached DHCPACK

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When chainloading iPXE from a VLAN device, the MAC address within the
cached DHCPACK will match the MAC address of the trunk device created
by iPXE, and the cached DHCPACK will then end up being erroneously
applied to the trunk device.  This tends to break outbound IPv4
routing, since both the trunk and VLAN devices will have the same
assigned IPv4 address.

Fix by recording the VLAN tag along with the cached DHCPACK, and
treating the VLAN tag as part of the filter used to match the cached
DHCPACK against candidate network devices.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-12-22 14:59:29 +00:00
parent b9571ca12e
commit 60b5532cfc
6 changed files with 41 additions and 15 deletions
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2
src/arch/x86/interface/pcbios/bios_cachedhcp.c
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@@ -59,7 +59,7 @@ static void cachedhcp_init ( void ) {
}
/* Record cached DHCPACK */
if ( ( rc = cachedhcp_record ( &cached_dhcpack,
if ( ( rc = cachedhcp_record ( &cached_dhcpack, 0,
phys_to_user ( cached_dhcpack_phys ),
sizeof ( BOOTPLAYER_t ) ) ) != 0 ) {
DBGC ( colour, "CACHEDHCP could not record DHCPACK: %s\n",