mptcp: allow creating non-backup subflows

Currently the 'backup' attribute of local endpoint
is ignored. Let's use it for the MP_JOIN handshake

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index ae3eeb9..8be4013 100644 (file)
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -20,6 +20,7 @@
 #include <net/ip6_route.h>
 #endif
 #include <net/mptcp.h>
+#include <uapi/linux/mptcp.h>
 #include "protocol.h"
 #include "mib.h"
 
@@ -1090,7 +1091,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
        subflow->remote_token = remote_token;
        subflow->local_id = local_id;
        subflow->request_join = 1;
-       subflow->request_bkup = 1;
+       subflow->request_bkup = !!(loc->flags & MPTCP_PM_ADDR_FLAG_BACKUP);
        mptcp_info2sockaddr(remote, &addr);
 
        err = kernel_connect(sf, (struct sockaddr *)&addr, addrlen, O_NONBLOCK);