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Commit 006469cf authored by Lepton Wu's avatar Lepton Wu Committed by Greg Kroah-Hartman
Browse files

VSOCK: bind to random port for VMADDR_PORT_ANY 



[ Upstream commit 8236b08cf50f85bbfaf48910a0b3ee68318b7c4b ]

The old code always starts from fixed port for VMADDR_PORT_ANY. Sometimes
when VMM crashed, there is still orphaned vsock which is waiting for
close timer, then it could cause connection time out for new started VM
if they are trying to connect to same port with same guest cid since the
new packets could hit that orphaned vsock. We could also fix this by doing
more in vhost_vsock_reset_orphans, but any way, it should be better to start
from a random local port instead of a fixed one.

Signed-off-by: default avatarLepton Wu <ytht.net@gmail.com>
Reviewed-by: default avatarJorgen Hansen <jhansen@vmware.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent c4c41610

net/vmw_vsock/af_vsock.c

+6 −1
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ 
#include <linux/mutex.h>

#include <linux/net.h>

#include <linux/poll.h>

#include <linux/random.h>

#include <linux/skbuff.h>

#include <linux/smp.h>

#include <linux/socket.h>
@@ -501,9 +502,13 @@ static void vsock_pending_work(struct work_struct *work) 
static int __vsock_bind_stream(struct vsock_sock *vsk,

			       struct sockaddr_vm *addr)

{

	static u32 port = LAST_RESERVED_PORT + 1;

	static u32 port = 0;

	struct sockaddr_vm new_addr;



	if (!port)

		port = LAST_RESERVED_PORT + 1 +

			prandom_u32_max(U32_MAX - LAST_RESERVED_PORT);



	vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);



	if (addr->svm_port == VMADDR_PORT_ANY) {