diff options
Diffstat (limited to 'dhcpcd/dhcpcd-hooks/10-mtu')
| -rw-r--r-- | dhcpcd/dhcpcd-hooks/10-mtu | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/dhcpcd/dhcpcd-hooks/10-mtu b/dhcpcd/dhcpcd-hooks/10-mtu new file mode 100644 index 00000000..f8657cbd --- /dev/null +++ b/dhcpcd/dhcpcd-hooks/10-mtu @@ -0,0 +1,38 @@ +# Configure the MTU for the interface + +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 set_mtu "$new_interface_mtu"; then + syslog info "MTU set to $new_interface_mtu" + # Save the MTU so we can restore it later + if [ ! -e "$mtu_dir/$interface" ]; then + mkdir -p "$mtu_dir" + echo "$ifmtu" > "$mtu_dir/$interface" + fi + fi + fi +elif [ -e "$mtu_dir/$interface" ]; then + if $if_up || $if_down; then + # No MTU in this state, so restore the prior MTU + mtu=$(cat "$mtu_dir/$interface") + syslog info "MTU restored to $mtu" + set_mtu "$mtu" + rm "$mtu_dir/$interface" + fi +fi |