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| author |   Jason A. Donenfeld <Jason@zx2c4.com> | 2017-04-24 05:01:16 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2017-05-17 18:07:42 +0200 |
| commit | 64c45d34d615b787255a4ca7b02f8d171eb5f672 (patch) | |
| tree | c6c02c903c3f956e1664822c5a295127b240e22c /src/tools/wg-quick.bash | |
| parent | tools: retry name resolution on temporary failure (diff) | |
| download | wireguard-monolithic-historical-64c45d34d615b787255a4ca7b02f8d171eb5f672.tar.xz wireguard-monolithic-historical-64c45d34d615b787255a4ca7b02f8d171eb5f672.zip | |
tools: wg-quick: auto MTU discovery
Diffstat (limited to 'src/tools/wg-quick.bash')
| -rwxr-xr-x | src/tools/wg-quick.bash | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/tools/wg-quick.bash b/src/tools/wg-quick.bash index 257ea7d..8cb439a 100755 --- a/src/tools/wg-quick.bash +++ b/src/tools/wg-quick.bash @@ -13,6 +13,7 @@ export PATH="${SELF%/*}:$PATH" WG_CONFIG="" INTERFACE="" ADDRESSES=( ) +MTU="" PRE_UP="" POST_UP="" PRE_DOWN="" @@ -39,6 +40,7 @@ parse_options() { if [[ $interface_section -eq 1 ]]; then case "$key" in Address) ADDRESSES+=( ${value//,/ } ); continue ;; + MTU) MTU="$value"; continue ;; PreUp) PRE_UP="$value"; continue ;; PreDown) PRE_DOWN="$value"; continue ;; PostUp) POST_UP="$value"; continue ;; @@ -108,6 +110,25 @@ add_addr() { cmd ip address add "$1" dev "$INTERFACE" } +set_mtu() { + local mtu=0 endpoint output + if [[ -n $MTU ]]; then + cmd ip link set mtu "$MTU" dev "$INTERFACE" + return + fi + while read -r _ endpoint; do + [[ $endpoint =~ ^([a-z0-9:.]+):[0-9]+$ ]] || continue + output="$(ip route get "${BASH_REMATCH[1]}" || true)" + [[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}" + done < <(wg show "$INTERFACE" endpoints) + if [[ $mtu -eq 0 ]]; then + read -r output < <(ip route show default || true) || true + [[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}" + fi + [[ $mtu -gt 0 ]] || mtu=1500 + cmd ip link set mtu $(( mtu - 80 )) dev "$INTERFACE" +} + add_route() { if [[ $1 == 0.0.0.0/0 || $1 == ::/0 ]]; then add_default "$1" @@ -146,6 +167,7 @@ save_config() { for address in ${BASH_REMATCH[1]}; do new_config+="Address = $address"$'\n' done + [[ -n $MTU && $(ip link show dev "$INTERFACE") =~ mtu\ ([0-9]+) ]] && new_config+="MTU = ${BASH_REMATCH[1]}"$'\n' [[ $SAVE_CONFIG -eq 0 ]] || new_config+=$'SaveConfig = true\n' [[ -z $PRE_UP ]] || new_config+="PreUp = $PRE_UP"$'\n' [[ -z $POST_UP ]] || new_config+="PostUp = $POST_UP"$'\n' @@ -200,6 +222,7 @@ cmd_up() { for i in "${ADDRESSES[@]}"; do add_addr "$i" done + set_mtu up_if for i in $(wg show "$INTERFACE" allowed-ips | grep -Po '(?<=[\t ])[0-9.:/a-f]+' | sort -nr -k 2 -t /); do [[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || add_route "$i" |