| # 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 |
