[OpenWrt-Devel] [PATCH] dnsmasq: Ignore carrier status for bridge interfaces

Reuben Dowle reuben.dowle at 4rf.com
Mon Jan 20 15:41:29 EST 2020

dnsmasq sometimes does not listen for DHCP at bootup on lan (see bug FS#1765).

This occurs because netifd can incorrectly indicate carrier down on an
interface through devstatus after issuing a carrier up hotplug event.

This patch ignores carrier status for bridge interfaces, as this does not
reflect media state so is not a useful check.

Signed-off-by: Reuben Dowle <reuben.dowle at 4rf.com>
 package/network/services/dnsmasq/files/dnsmasq.init | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/package/network/services/dnsmasq/files/dnsmasq.init b/package/network/services/dnsmasq/files/dnsmasq.init
index ae02f32..dd9874b
--- a/package/network/services/dnsmasq/files/dnsmasq.init
+++ b/package/network/services/dnsmasq/files/dnsmasq.init
@@ -104,9 +104,12 @@ dhcp_check() {

 # If there's no carrier yet, skip this interface.
 # The init script will be called again once the link is up
-case "$(devstatus "$ifname" | jsonfilter -e @.carrier)" in
-false) return 1;;
+local carrier
+local type
+eval $(devstatus "$ifname" | jsonfilter -e "carrier=@.carrier" -e "type=@.type")
+if [ "$carrier" = "false" -a "$type" != "bridge" ]; then
+return 1

 udhcpc -n -q -s /bin/true -t 1 -i "$ifname" >&- && rv=1 || rv=0


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