linux-kernel - [PATCH 07/18] xen/pvcalls: implement socket command

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Message-Id: <1494880570-14209-7-git-send-email-sstabellini@kernel.org>
Date:   Mon, 15 May 2017 13:35:59 -0700
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     xen-devel@...ts.xen.org
Cc:     linux-kernel@...r.kernel.org, sstabellini@...nel.org,
        jgross@...e.com, boris.ostrovsky@...cle.com,
        Stefano Stabellini <stefano@...reto.com>
Subject: [PATCH 07/18] xen/pvcalls: implement socket command

Just reply with success to the other end for now. Delay the allocation
of the actual socket to bind and/or connect.

Signed-off-by: Stefano Stabellini <stefano@...reto.com>
CC: boris.ostrovsky@...cle.com
CC: jgross@...e.com
---
 drivers/xen/pvcalls-back.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index 2b2a49a..2eae096 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -12,12 +12,17 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/inet.h>
 #include <linux/kthread.h>
 #include <linux/list.h>
 #include <linux/radix-tree.h>
 #include <linux/module.h>
 #include <linux/rwsem.h>
 #include <linux/wait.h>
+#include <net/sock.h>
+#include <net/inet_common.h>
+#include <net/inet_connection_sock.h>
+#include <net/request_sock.h>
 
 #include <xen/events.h>
 #include <xen/grant_table.h>
@@ -65,7 +70,31 @@ static void pvcalls_back_ioworker(struct work_struct *work)
 static int pvcalls_back_socket(struct xenbus_device *dev,
 		struct xen_pvcalls_request *req)
 {
-	return 0;
+	struct pvcalls_back_priv *priv;
+	int ret;
+	struct xen_pvcalls_response *rsp;
+
+	if (dev == NULL)
+		return 0;
+	priv = dev_get_drvdata(&dev->dev);
+
+	if (req->u.socket.domain != AF_INET ||
+	    req->u.socket.type != SOCK_STREAM ||
+	    (req->u.socket.protocol != 0 &&
+	     req->u.socket.protocol != AF_INET))
+		ret = -EAFNOSUPPORT;
+	else
+		ret = 0;
+
+	/* leave the actual socket allocation for later */
+
+	rsp = RING_GET_RESPONSE(&priv->ring, priv->ring.rsp_prod_pvt++);
+	rsp->req_id = req->req_id;
+	rsp->cmd = req->cmd;
+	rsp->u.socket.id = req->u.socket.id;
+	rsp->ret = ret;
+
+	return 1;
 }
 
 static int pvcalls_back_connect(struct xenbus_device *dev,
-- 
1.9.1