From: Roy Marples <roy@marples.name>
Date: Mon, 5 Mar 2012 11:13:06 +0000 (+0000)
Subject: Use sysfs if we don't have ifconfig(8) on Linux.
X-Git-Tag: v5.5.5~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eb0faa896202e162e8dd25a02a29f75357855027;p=thirdparty%2Fdhcpcd.git

Use sysfs if we don't have ifconfig(8) on Linux.
Thanks to Dave Reisner.
---

diff --git a/dhcpcd-hooks/10-mtu b/dhcpcd-hooks/10-mtu
index 639697c9..f04274e7 100644
--- a/dhcpcd-hooks/10-mtu
+++ b/dhcpcd-hooks/10-mtu
@@ -2,12 +2,23 @@
 
 mtu_dir="$state_dir/mtu"
 
+set_mtu()
+{
+	local mtu=$1
+
+	if [ -w /sys/class/net/$interface/mtu ]; then
+		echo "$mtu" >/sys/class/net/$interface/mtu
+	else
+		ifconfig "$interface" mtu "$mtu"
+	fi
+}
+
 if [ "$reason" = PREINIT -a -e "$mtu_dir/$interface" ]; then
 	rm "$mtu_dir/$interface"
 elif [ -n "$new_interface_mtu" ] && $if_up; then
 	# The smalled MTU dhcpcd can work with is 576
 	if [ "$new_interface_mtu" -ge 576 ]; then
-		if ifconfig "$interface" mtu "$new_interface_mtu"; then
+		if set_mtu "$new_interface_mtu"; then
 			syslog info "$interface: MTU set to $new_interface_mtu"
 			# Save the MTU so we can restore it later
 			if [ ! -e "$mtu_dir/$interface" ]; then
@@ -21,7 +32,7 @@ elif [ -e "$mtu_dir/$interface" ]; then
 		# No MTU in this state, so restore the prior MTU
 		mtu=$(cat "$mtu_dir/$interface")
 		syslog info "$interface: MTU restored to $mtu"
-		ifconfig "$interface" mtu "$mtu"
+		set_mtu "$mtu"
 		rm "$mtu_dir/$interface"
 	fi
 fi