wg-quick: freebsd: add kernel support

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/src/wg-quick/freebsd.bash b/src/wg-quick/freebsd.bash
index e1ee67fb834fa76327e54e66cba2ed843b3c65c9..c6744d334a013213956c73377beadbeabba8f7f6 100755 (executable)
--- a/src/wg-quick/freebsd.bash
+++ b/src/wg-quick/freebsd.bash
@@ -8,6 +8,7 @@ set -e -o pipefail
 shopt -s extglob
 export LC_ALL=C
 
+exec 3>&2
 SELF="$(readlink -f "${BASH_SOURCE[0]}")"
 export PATH="${SELF%/*}:$PATH"
 
@@ -28,7 +29,7 @@ PROGRAM="${0##*/}"
 ARGS=( "$@" )
 
 cmd() {
-       echo "[#] $*" >&2
+       echo "[#] $*" >&3
        "$@"
 }
 
@@ -114,6 +115,16 @@ auto_su() {
 }
 
 add_if() {
+       local ret rc
+       if ret="$(cmd ifconfig wg create name "$INTERFACE" 2>&1 >/dev/null)"; then
+               return 0
+       fi
+       rc=$?
+       if [[ $ret == *"ifconfig: ioctl SIOCSIFNAME (set name): File exists"* ]]; then
+               echo "$ret" >&3
+               return $rc
+       fi
+       echo "[!] Missing WireGuard kernel support ($ret). Falling back to slow userspace implementation." >&3
        cmd "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" "$INTERFACE"
 }
 
@@ -157,7 +168,11 @@ if_exists() {
 
 del_if() {
        [[ $HAVE_SET_DNS -eq 0 ]] || unset_dns
-       cmd rm -f "/var/run/wireguard/$INTERFACE.sock"
+       if [[ -f /var/run/wireguard/$INTERFACE.sock ]]; then
+               cmd rm -f "/var/run/wireguard/$INTERFACE.sock"
+       else
+               cmd ifconfig "$INTERFACE" destroy
+       fi
        while if_exists; do
                # HACK: it would be nice to `route monitor` here and wait for RTM_IFANNOUNCE
                # but it turns out that the announcement is made before the interface
@@ -290,7 +305,6 @@ monitor_daemon() {
        # endpoints change.
        while read -r event; do
                [[ $event == RTM_* ]] || continue
-               [[ -e /var/run/wireguard/$INTERFACE.sock ]] || break
                if_exists || break
                [[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route
                # TODO: set the mtu as well, but only if up