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authorJason A. Donenfeld <Jason@zx2c4.com>2021-06-04 17:17:33 +0200
committerDavid S. Miller <davem@davemloft.net>2021-06-04 14:25:14 -0700
commit24b70eeeb4f46c09487f8155239ebfb1f875774a (patch)
tree31268b9d1c991514bd604304fe3aebd7676dd685
parentcc5060ca0285efe2728bced399a1955a7ce808b2 (diff)
wireguard: use synchronize_net rather than synchronize_rcu
Many of the synchronization points are sometimes called under the rtnl lock, which means we should use synchronize_net rather than synchronize_rcu. Under the hood, this expands to using the expedited flavor of function in the event that rtnl is held, in order to not stall other concurrent changes. This fixes some very, very long delays when removing multiple peers at once, which would cause some operations to take several minutes. Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Cc: stable@vger.kernel.org Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/wireguard/peer.c6
-rw-r--r--drivers/net/wireguard/socket.c2
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/wireguard/peer.c b/drivers/net/wireguard/peer.c
index cd5cb0292cb6..3a042d28eb2e 100644
--- a/drivers/net/wireguard/peer.c
+++ b/drivers/net/wireguard/peer.c
@@ -88,7 +88,7 @@ static void peer_make_dead(struct wg_peer *peer)
/* Mark as dead, so that we don't allow jumping contexts after. */
WRITE_ONCE(peer->is_dead, true);
- /* The caller must now synchronize_rcu() for this to take effect. */
+ /* The caller must now synchronize_net() for this to take effect. */
}
static void peer_remove_after_dead(struct wg_peer *peer)
@@ -160,7 +160,7 @@ void wg_peer_remove(struct wg_peer *peer)
lockdep_assert_held(&peer->device->device_update_lock);
peer_make_dead(peer);
- synchronize_rcu();
+ synchronize_net();
peer_remove_after_dead(peer);
}
@@ -178,7 +178,7 @@ void wg_peer_remove_all(struct wg_device *wg)
peer_make_dead(peer);
list_add_tail(&peer->peer_list, &dead_peers);
}
- synchronize_rcu();
+ synchronize_net();
list_for_each_entry_safe(peer, temp, &dead_peers, peer_list)
peer_remove_after_dead(peer);
}
diff --git a/drivers/net/wireguard/socket.c b/drivers/net/wireguard/socket.c
index d9ad850daa79..8c496b747108 100644
--- a/drivers/net/wireguard/socket.c
+++ b/drivers/net/wireguard/socket.c
@@ -430,7 +430,7 @@ void wg_socket_reinit(struct wg_device *wg, struct sock *new4,
if (new4)
wg->incoming_port = ntohs(inet_sk(new4)->inet_sport);
mutex_unlock(&wg->socket_update_lock);
- synchronize_rcu();
+ synchronize_net();
sock_free(old4);
sock_free(old6);
}