netdev - [PATCH net-next 14/14] vsock: fix bind() behaviour taking care of CID

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Message-Id: <20191023095554.11340-15-sgarzare@redhat.com>
Date:   Wed, 23 Oct 2019 11:55:54 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     netdev@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dexuan Cui <decui@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jorgen Hansen <jhansen@...are.com>,
        Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-hyperv@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH net-next 14/14] vsock: fix bind() behaviour taking care of CID

When we are looking for a socket bound to a specific address,
we also have to take into account the CID.

This patch is useful with multi-transports support because it
allows the binding of the same port with different CID, and
it prevents a connection to a wrong socket bound to the same
port, but with different CID.

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>
Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 net/vmw_vsock/af_vsock.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 1f2e707cae66..7183de277072 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -228,10 +228,16 @@ static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
 {
 	struct vsock_sock *vsk;
 
-	list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table)
-		if (addr->svm_port == vsk->local_addr.svm_port)
+	list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) {
+		if (vsock_addr_equals_addr(addr, &vsk->local_addr))
 			return sk_vsock(vsk);
 
+		if (addr->svm_port == vsk->local_addr.svm_port &&
+		    (vsk->local_addr.svm_cid == VMADDR_CID_ANY ||
+		     addr->svm_cid == VMADDR_CID_ANY))
+			return sk_vsock(vsk);
+	}
+
 	return NULL;
 }
 
-- 
2.21.0