From c4fbd6cdd340268a7cbb11410895c9353f4deabf Mon Sep 17 00:00:00 2001
From: Julian Orth <ju.orth@gmail.com>
Date: Thu, 6 Sep 2018 19:28:43 +0200
Subject: socket: allow modification of transit_net

---
 src/device.c  |  6 +++---
 src/netlink.c |  2 +-
 src/socket.c  | 18 ++++++++++--------
 src/socket.h  |  6 +++---
 4 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/src/device.c b/src/device.c
index 0c0c17b..18b4587 100644
--- a/src/device.c
+++ b/src/device.c
@@ -53,7 +53,7 @@ static int wg_open(struct net_device *dev)
 #endif
 #endif
 
-	ret = wg_socket_init(wg, wg->incoming_port);
+	ret = wg_socket_init(wg, wg->transit_net, wg->incoming_port);
 	if (ret < 0)
 		return ret;
 	mutex_lock(&wg->device_update_lock);
@@ -118,7 +118,7 @@ static int wg_stop(struct net_device *dev)
 	}
 	mutex_unlock(&wg->device_update_lock);
 	skb_queue_purge(&wg->incoming_handshakes);
-	wg_socket_reinit(wg, NULL, NULL);
+	wg_socket_reinit(wg, NULL, NULL, NULL);
 	return 0;
 }
 
@@ -236,7 +236,7 @@ static void wg_destruct(struct net_device *dev)
 	rtnl_unlock();
 	mutex_lock(&wg->device_update_lock);
 	wg->incoming_port = 0;
-	wg_socket_reinit(wg, NULL, NULL);
+	wg_socket_reinit(wg, NULL, NULL, NULL);
 	wg_allowedips_free(&wg->peer_allowedips, &wg->device_update_lock);
 	/* The final references are cleared in the below calls to destroy_workqueue. */
 	wg_peer_remove_all(wg);
diff --git a/src/netlink.c b/src/netlink.c
index 8d22230..e0f3632 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -362,7 +362,7 @@ static int set_port(struct wg_device *wg, u16 port)
 		wg->incoming_port = port;
 		return 0;
 	}
-	return wg_socket_init(wg, port);
+	return wg_socket_init(wg, wg->transit_net, port);
 }
 
 static int set_allowedip(struct wg_peer *peer, struct nlattr **attrs)
diff --git a/src/socket.c b/src/socket.c
index 75e4114..1ac065f 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -352,7 +352,7 @@ static void set_sock_opts(struct socket *sock)
 	sk_set_memalloc(sock->sk);
 }
 
-int wg_socket_init(struct wg_device *wg, u16 port)
+int wg_socket_init(struct wg_device *wg, struct net *net, u16 port)
 {
 	int ret;
 	struct udp_tunnel_sock_cfg cfg = {
@@ -382,18 +382,18 @@ int wg_socket_init(struct wg_device *wg, u16 port)
 retry:
 #endif
 
-	ret = udp_sock_create(wg->transit_net, &port4, &new4);
+	ret = udp_sock_create(net, &port4, &new4);
 	if (ret < 0) {
 		pr_err("%s: Could not create IPv4 socket\n", wg->dev->name);
 		return ret;
 	}
 	set_sock_opts(new4);
-	setup_udp_tunnel_sock(wg->transit_net, new4, &cfg);
+	setup_udp_tunnel_sock(net, new4, &cfg);
 
 #if IS_ENABLED(CONFIG_IPV6)
 	if (ipv6_mod_enabled()) {
 		port6.local_udp_port = inet_sk(new4->sk)->inet_sport;
-		ret = udp_sock_create(wg->transit_net, &port6, &new6);
+		ret = udp_sock_create(net, &port6, &new6);
 		if (ret < 0) {
 			udp_tunnel_sock_release(new4);
 			if (ret == -EADDRINUSE && !port && retries++ < 100)
@@ -403,16 +403,16 @@ retry:
 			return ret;
 		}
 		set_sock_opts(new6);
-		setup_udp_tunnel_sock(wg->transit_net, new6, &cfg);
+		setup_udp_tunnel_sock(net, new6, &cfg);
 	}
 #endif
 
-	wg_socket_reinit(wg, new4 ? new4->sk : NULL, new6 ? new6->sk : NULL);
+	wg_socket_reinit(wg, net, new4 ? new4->sk : NULL, new6 ? new6->sk : NULL);
 	return 0;
 }
 
-void wg_socket_reinit(struct wg_device *wg, struct sock *new4,
-		      struct sock *new6)
+void wg_socket_reinit(struct wg_device *wg, struct net *net,
+		      struct sock *new4, struct sock *new6)
 {
 	struct sock *old4, *old6;
 
@@ -425,6 +425,8 @@ void wg_socket_reinit(struct wg_device *wg, struct sock *new4,
 	rcu_assign_pointer(wg->sock6, new6);
 	if (new4)
 		wg->incoming_port = ntohs(inet_sk(new4)->inet_sport);
+	if (net && wg->transit_net != net)
+		wg_device_set_nets(wg, wg->dev_net, net);
 	mutex_unlock(&wg->socket_update_lock);
 	synchronize_rcu_bh();
 	synchronize_net();
diff --git a/src/socket.h b/src/socket.h
index 9d3e8e1..2db1f86 100644
--- a/src/socket.h
+++ b/src/socket.h
@@ -11,9 +11,9 @@
 #include <linux/if_vlan.h>
 #include <linux/if_ether.h>
 
-int wg_socket_init(struct wg_device *wg, u16 port);
-void wg_socket_reinit(struct wg_device *wg, struct sock *new4,
-		      struct sock *new6);
+int wg_socket_init(struct wg_device *wg, struct net *net, u16 port);
+void wg_socket_reinit(struct wg_device *wg, struct net *net,
+		      struct sock *new4, struct sock *new6);
 int wg_socket_send_buffer_to_peer(struct wg_peer *peer, void *data,
 				  size_t len, u8 ds);
 int wg_socket_send_skb_to_peer(struct wg_peer *peer, struct sk_buff *skb,
-- 
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