From cf475d661f8a6ca7b6fb22204d7ea983fdcf7f07 Mon Sep 17 00:00:00 2001
From: des <des@FreeBSD.org>
Date: Wed, 27 Mar 2019 15:17:29 +0000
Subject: [PATCH] Add workaround for a QoS-related bug in VMWare Workstation.

Submitted by:	yuripv
Differential Revision:	https://reviews.freebsd.org/D18636
---
 crypto/openssh/readconf.c   | 22 ++++++++++++++++++++++
 secure/usr.bin/ssh/Makefile |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/crypto/openssh/readconf.c b/crypto/openssh/readconf.c
index f97a6ac72a9..9ed6902a0f4 100644
--- a/crypto/openssh/readconf.c
+++ b/crypto/openssh/readconf.c
@@ -16,6 +16,9 @@
 __RCSID("$FreeBSD$");
 
 #include <sys/types.h>
+#ifdef VMWARE_GUEST_WORKAROUND
+#include <sys/sysctl.h>
+#endif
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
@@ -1954,6 +1957,15 @@ fill_default_options(Options * options)
 {
 	char *all_cipher, *all_mac, *all_kex, *all_key;
 	int r;
+#ifdef VMWARE_GUEST_WORKAROUND
+	char scval[7];	/* "vmware\0" */
+	size_t scsiz = sizeof(scval);
+	int vmwguest = 0;
+
+	if (sysctlbyname("kern.vm_guest", scval, &scsiz, NULL, 0) == 0 &&
+	    strcmp(scval, "vmware") == 0)
+		vmwguest = 1;
+#endif
 
 	if (options->forward_agent == -1)
 		options->forward_agent = 0;
@@ -2088,8 +2100,18 @@ fill_default_options(Options * options)
 	if (options->visual_host_key == -1)
 		options->visual_host_key = 0;
 	if (options->ip_qos_interactive == -1)
+#ifdef VMWARE_GUEST_WORKAROUND
+		if (vmwguest)
+			options->ip_qos_interactive = IPTOS_LOWDELAY;
+		else
+#endif
 		options->ip_qos_interactive = IPTOS_DSCP_AF21;
 	if (options->ip_qos_bulk == -1)
+#ifdef VMWARE_GUEST_WORKAROUND
+		if (vmwguest)
+			options->ip_qos_bulk = IPTOS_THROUGHPUT;
+		else
+#endif
 		options->ip_qos_bulk = IPTOS_DSCP_CS1;
 	if (options->request_tty == -1)
 		options->request_tty = REQUEST_TTY_AUTO;
diff --git a/secure/usr.bin/ssh/Makefile b/secure/usr.bin/ssh/Makefile
index 614cc7627fc..023fa4a55be 100644
--- a/secure/usr.bin/ssh/Makefile
+++ b/secure/usr.bin/ssh/Makefile
@@ -37,6 +37,9 @@ LIBADD+=	crypto
 CFLAGS+= -DXAUTH_PATH=\"${LOCALBASE}/bin/xauth\"
 .endif
 
+# Workaround VMware Workstation NAT bug
+CFLAGS+=-DVMWARE_GUEST_WORKAROUND
+
 .include <bsd.prog.mk>
 
 .PATH:	${SSHDIR}
-- 
2.45.0