37 lines
1.0 KiB
Plaintext
37 lines
1.0 KiB
Plaintext
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# From https://chromium.googlesource.com/chromiumos/third_party/dhcpcd/+/refs/tags/dhcpcd-6.0.0/dhcpcd-hooks
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# Configure the MTU for the interface
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mtu_dir="$state_dir/mtu"
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set_mtu()
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{
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local mtu=$1
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if [ -w /sys/class/net/$interface/mtu ]; then
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echo "$mtu" >/sys/class/net/$interface/mtu
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else
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ifconfig "$interface" mtu "$mtu"
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fi
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}
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if [ "$reason" = PREINIT -a -e "$mtu_dir/$interface" ]; then
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rm "$mtu_dir/$interface"
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elif [ -n "$new_interface_mtu" ] && $if_up; then
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# The smalled MTU dhcpcd can work with is 576
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if [ "$new_interface_mtu" -ge 576 ]; then
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if set_mtu "$new_interface_mtu"; then
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syslog info "MTU set to $new_interface_mtu"
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# Save the MTU so we can restore it later
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if [ ! -e "$mtu_dir/$interface" ]; then
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mkdir -p "$mtu_dir"
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echo "$ifmtu" > "$mtu_dir/$interface"
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fi
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fi
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fi
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elif [ -e "$mtu_dir/$interface" ]; then
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if $if_up || $if_down; then
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# No MTU in this state, so restore the prior MTU
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mtu=$(cat "$mtu_dir/$interface")
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syslog info "MTU restored to $mtu"
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set_mtu "$mtu"
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rm "$mtu_dir/$interface"
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fi
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fi
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