linux-kernel - Re: [ofa-general] [PATCH 2.6.25] RDMA/cxgb3: Fail loopbackconnections.

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Date:	Wed, 13 Feb 2008 07:49:16 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Steve Wise <swise@...ngridcomputing.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	general@...ts.openfabrics.org
Subject: Re: [ofa-general] [PATCH 2.6.25] RDMA/cxgb3: Fail loopbackconnections.

Steve, I had to update the patch adding an include and fixing the
function declaration (as below)... but how much testing have you done
with this??

commit 8704e9a8790cc9e394198663c1c9150c899fb9a2
Author: Steve Wise <swise@...ngridcomputing.com>
Date:   Tue Feb 12 16:09:29 2008 -0600

    RDMA/cxgb3: Fail loopback connections
    
    The cxgb3 HW and driver don't support loopback RDMA connections.  So
    fail any connection attempt where the destination address is local.
    
    Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
    Signed-off-by: Roland Dreier <rolandd@...co.com>

diff --git a/drivers/infiniband/hw/cxgb3/iwch_cm.c b/drivers/infiniband/hw/cxgb3/iwch_cm.c
index e9a08fa..320f2b6 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_cm.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_cm.c
@@ -35,6 +35,7 @@
 #include <linux/skbuff.h>
 #include <linux/timer.h>
 #include <linux/notifier.h>
+#include <linux/inetdevice.h>
 
 #include <net/neighbour.h>
 #include <net/netevent.h>
@@ -1784,6 +1785,17 @@ err:
 	return err;
 }
 
+static int is_loopback_dst(struct iw_cm_id *cm_id)
+{
+	struct net_device *dev;
+
+	dev = ip_dev_find(&init_net, cm_id->remote_addr.sin_addr.s_addr);
+	if (!dev)
+		return 0;
+	dev_put(dev);
+	return 1;
+}
+
 int iwch_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
 {
 	int err = 0;
@@ -1791,6 +1803,11 @@ int iwch_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
 	struct iwch_ep *ep;
 	struct rtable *rt;
 
+	if (is_loopback_dst(cm_id)) {
+		err = -ENOSYS;
+		goto out;
+	}
+
 	ep = alloc_ep(sizeof(*ep), GFP_KERNEL);
 	if (!ep) {
 		printk(KERN_ERR MOD "%s - cannot alloc ep.\n", __FUNCTION__);
--
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