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 <[email protected]>
multipath-tcp · Aug 29, 2020 · 808f42d · 808f42d
1 parent 50aba89
commit 808f42d
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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"
 
@@ -1092,7 +1093,7 @@ 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);