From 64e47de870a2f0575b5564a70e5680b48ab83ff9 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 18 May 2017 14:40:26 +0200
Subject: wg-quick: use src routing for default routes in v6

Otherwise, traffic is sent with the IP address of a different interface,
and then packets don't actually get delivered.
---
 src/tools/wg-quick.bash | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/tools/wg-quick.bash b/src/tools/wg-quick.bash
index 8cb439a..a4f349a 100755
--- a/src/tools/wg-quick.bash
+++ b/src/tools/wg-quick.bash
@@ -143,10 +143,18 @@ add_default() {
 		DEFAULT_TABLE=51820
 		while [[ -n $(ip route show table $DEFAULT_TABLE) ]]; do ((DEFAULT_TABLE++)); done
 	fi
-	local proto=-4
-	[[ $1 == *:* ]] && proto=-6
+	local proto=-4 src ip
+	if [[ $1 == *:* ]]; then
+		proto=-6
+		for ip in "${ADDRESSES[@]}"; do
+			if [[ $ip == *:* ]]; then
+				src="src ${ip%/*}"
+				break
+			fi
+		done
+	fi
 	cmd wg set "$INTERFACE" fwmark $DEFAULT_TABLE
-	cmd ip $proto route add "$1" dev "$INTERFACE" table $DEFAULT_TABLE
+	cmd ip $proto route add "$1" $src dev "$INTERFACE" table $DEFAULT_TABLE
 	cmd ip $proto rule add not fwmark $DEFAULT_TABLE table $DEFAULT_TABLE
 	cmd ip $proto rule add table main suppress_prefixlength 0
 	local key value
-- 
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