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diff --git a/sys/rpc/clnt_rc.c b/sys/rpc/clnt_rc.c
--- a/sys/rpc/clnt_rc.c
+++ b/sys/rpc/clnt_rc.c
@@ -42,6 +42,8 @@
#include <sys/time.h>
#include <sys/uio.h>
+#include <netinet/tcp.h>
+
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#include <rpc/krpc.h>
@@ -212,6 +214,12 @@
goto out;
}
}
+ if (newclient != NULL) {
+ int optval = 1;
+
+ (void)so_setsockopt(so, IPPROTO_TCP, TCP_USE_DDP,
+ &optval, sizeof(optval));
+ }
if (newclient != NULL && rc->rc_reconcall != NULL)
(*rc->rc_reconcall)(newclient, rc->rc_reconarg,
rc->rc_ucred);
diff --git a/sys/rpc/svc.h b/sys/rpc/svc.h
--- a/sys/rpc/svc.h
+++ b/sys/rpc/svc.h
@@ -185,6 +185,7 @@
int xp_ngrps; /* Cred. from TLS cert. */
uid_t xp_uid;
gid_t *xp_gidp;
+ int xp_doneddp;
#else
int xp_fd;
u_short xp_port; /* associated port number */
diff --git a/sys/rpc/svc.c b/sys/rpc/svc.c
--- a/sys/rpc/svc.c
+++ b/sys/rpc/svc.c
@@ -50,6 +50,7 @@
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
+#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
@@ -57,6 +58,8 @@
#include <sys/sx.h>
#include <sys/ucred.h>
+#include <netinet/tcp.h>
+
#include <rpc/rpc.h>
#include <rpc/rpcb_clnt.h>
#include <rpc/replay.h>
@@ -987,6 +990,23 @@
goto call_done;
}
+ /*
+ * Defer enabling DDP until the first non-NULLPROC RPC
+ * is received to allow STARTTLS authentication to
+ * enable TLS offload first.
+ */
+ if (xprt->xp_doneddp == 0 && r->rq_proc != NULLPROC &&
+ atomic_cmpset_int(&xprt->xp_doneddp, 0, 1)) {
+ if (xprt->xp_socket->so_proto->pr_protocol ==
+ IPPROTO_TCP) {
+ int optval = 1;
+
+ (void)so_setsockopt(xprt->xp_socket,
+ IPPROTO_TCP, TCP_USE_DDP, &optval,
+ sizeof(optval));
+ }
+ }
+
/*
* Everything checks out, return request to caller.
*/

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