Rmroute

scripts/build-toybox.sh

@@ -5,7 +5,7 @@ set -exu
 # Toybox route is "pending" but the TODOs are in add/del;
 # we're using it for display only so we should be good.
 # Toybox sh has more TODOs in multiple areas so don't use it.
-toys="base64 mktemp mv route timeout"
+toys="base64 mktemp mv timeout"
 
 cd /toybox-*/
 

scripts/install-cni.sh

@@ -212,16 +212,19 @@ else
   cni_spec=${cni_spec//@ipv6RouteOptional/}
 fi
 
-# Format of `route` output:
-# Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
-# 0.0.0.0         192.168.0.1     0.0.0.0         UG    100    0        0 ens4
-# 192.168.0.1     0.0.0.0         255.255.255.255 UH    100    0        0 ens4
+# Format of /proc/net/route:
+# Iface	Destination	Gateway 	Flags	RefCnt	Use	Metric	Mask		MTU	Window	IRTT
+# ens4	00000000	0100A8C0	0003	0	0	100	00000000	0	0	0
+# ens4	0100A8C0	00000000	0005	0	0	100	FFFFFFFF	0	0	0
+
+# Note that Destination and Mask are IP represented in hexadecimal in
+# little-endian. Regardless of endianness, 00000000 is always 0.0.0.0.
 
 # The first grep extracts the default line, and the second grep extracts the
-# last field, which is the interface name. We stick to using grep to avoid
+# first field, which is the interface name. We stick to using grep to avoid
 # introducing too many new dependencies.
 
-default_nic=$(route -n | grep -E '^0\.0\.0\.0\s+\S+\s+0\.0\.0\.0' | grep -oE '\S+$')
+default_nic=$(grep -E '^\S+\s+00000000\s+\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+00000000\s+' /proc/net/route | grep -oE '^\S+')
 
 # Set mtu
 if [ -f "/sys/class/net/$default_nic/mtu" ]; then

scripts/shell-test.sh

@@ -59,7 +59,7 @@ run_test inotify_cmd
 inotify / '' /bin/cat /dev/null >/dev/null && pass || fail
 
 run_test default_nic_mtu
-[[ -f "/sys/class/net/$(route -n | grep -E '^0\.0\.0\.0\s+\S+\s+0\.0\.0\.0' | grep -oE '\S+$')/mtu" ]] && pass || fail
+[[ -f "/sys/class/net/$(grep -E '^\S+\s+00000000\s+\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+00000000\s+' /proc/net/route | grep -oE '^\S+')/mtu" ]] && pass || fail
 
 run_test mktemp_cmd
 [[ -f "$(mktemp /tmp.XXXXXX)" ]] && pass || fail