[PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Yuval Shaia]

To support security applications, that need to filter out connections based
on SGID, an ioctl command to retrieve SGID of a given socket is added.

Signed-off-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
 drivers/infiniband/ulp/ipoib/Makefile      |    3 +-
 drivers/infiniband/ulp/ipoib/ipoib.h       |   11 ++
 drivers/infiniband/ulp/ipoib/ipoib_ioctl.c |  152 ++++++++++++++++++++++++++++
 drivers/infiniband/ulp/ipoib/ipoib_main.c  |    6 +
 4 files changed, 171 insertions(+), 1 deletions(-)
 create mode 100644 drivers/infiniband/ulp/ipoib/ipoib_ioctl.c

diff --git a/drivers/infiniband/ulp/ipoib/Makefile b/drivers/infiniband/ulp/ipoib/Makefile
index e5430dd..9915cf8 100644
--- a/drivers/infiniband/ulp/ipoib/Makefile
+++ b/drivers/infiniband/ulp/ipoib/Makefile
@@ -6,7 +6,8 @@ ib_ipoib-y					:= ipoib_main.o \
 						   ipoib_verbs.o \
 						   ipoib_vlan.o \
 						   ipoib_ethtool.o \
-						   ipoib_netlink.o
+						   ipoib_netlink.o \
+						   ipoib_ioctl.o
 ib_ipoib-$(CONFIG_INFINIBAND_IPOIB_CM)		+= ipoib_cm.o
 ib_ipoib-$(CONFIG_INFINIBAND_IPOIB_DEBUG)	+= ipoib_fs.o
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index edc5b85..01b8d4d 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -434,6 +434,15 @@ struct ipoib_neigh {
 	unsigned long       alive;
 };
 
+/* ioctl API */
+#define IPOIBGETSGUID		SIOCDEVPRIVATE
+
+struct ipoib_ioctl_getsgid_data {
+	u64	gid;
+	u64	subnet_prefix;
+	int	fd;
+};
+
 #define IPOIB_UD_MTU(ib_mtu)		(ib_mtu - IPOIB_ENCAP_LEN)
 #define IPOIB_UD_BUF_SIZE(ib_mtu)	(ib_mtu + IB_GRH_BYTES)
 
@@ -452,6 +461,7 @@ void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid);
 extern struct workqueue_struct *ipoib_workqueue;
 
 /* functions */
+struct list_head *ipoib_get_dev_list(struct ib_device *dev);
 
 int ipoib_poll(struct napi_struct *napi, int budget);
 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr);
@@ -467,6 +477,7 @@ static inline void ipoib_put_ah(struct ipoib_ah *ah)
 int ipoib_open(struct net_device *dev);
 int ipoib_add_pkey_attr(struct net_device *dev);
 int ipoib_add_umcast_attr(struct net_device *dev);
+int ipoib_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
 
 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 		struct ipoib_ah *address, u32 qpn);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ioctl.c b/drivers/infiniband/ulp/ipoib/ipoib_ioctl.c
new file mode 100644
index 0000000..124d545
--- /dev/null
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ioctl.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2015 Oracle Corporation.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <net/arp.h>
+#include <linux/jhash.h>
+#include <net/inet_sock.h>
+#include <net/route.h>
+
+#include "ipoib.h"
+
+static int ipoib_get_sguid(struct net_device *dev, int fd, u64 *sgid,
+			   u64 *subnet_prefix)
+{
+	struct socket *sock;
+	struct inet_sock *inetsock;
+	struct neighbour *neigh;
+	int rc = 0;
+	union ib_gid *gid;
+	struct list_head *dev_list = 0;
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	u16 pkey_index = priv->pkey_index;
+	struct ipoib_dev_priv *child_priv;
+
+	sock = sockfd_lookup(fd, &rc);
+	if (IS_ERR_OR_NULL(sock))
+		return -EINVAL;
+
+	inetsock = inet_sk(sock->sk);
+
+	neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr, dev);
+	if (!IS_ERR_OR_NULL(neigh))
+		goto found;
+
+	/* If not found try in all other ipoib devices */
+	dev_list = ipoib_get_dev_list(priv->ca);
+	if (!dev_list)
+		return -EINVAL;
+
+	list_for_each_entry(priv, dev_list, list) {
+		if (priv->pkey_index == pkey_index) {
+			neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr,
+					     priv->dev);
+			if (!IS_ERR_OR_NULL(neigh))
+				goto found;
+		}
+		list_for_each_entry(child_priv, &priv->child_intfs, list) {
+			if (child_priv->pkey_index == pkey_index) {
+				neigh = neigh_lookup(&arp_tbl,
+						     &inetsock->inet_daddr,
+						     child_priv->dev);
+				if (!IS_ERR_OR_NULL(neigh))
+					goto found;
+			}
+		}
+	}
+
+	return -ENODEV;
+
+found:
+	if (!(neigh->nud_state & NUD_VALID))
+		return -EINVAL;
+
+	gid = (union ib_gid *)(neigh->ha + 4);
+	*sgid = be64_to_cpu(gid->global.interface_id);
+	*subnet_prefix = be64_to_cpu(gid->global.subnet_prefix);
+
+	neigh_release(neigh);
+
+	return 0;
+}
+
+static int ipoib_ioctl_getsguid(struct net_device *dev, struct ifreq *ifr)
+{
+	struct ipoib_ioctl_getsgid_data req_data;
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	int rc;
+
+	rc = copy_from_user(&req_data, ifr->ifr_data,
+			    sizeof(struct ipoib_ioctl_getsgid_data));
+	if (rc != 0) {
+		ipoib_warn(priv, "ioctl fail to copy request data\n");
+		return -EINVAL;
+	}
+	rc = ipoib_get_sguid(dev, req_data.fd, &req_data.gid,
+			     &req_data.subnet_prefix);
+	if (rc) {
+		ipoib_warn(priv, "Invalid fd %d (err=%d)\n",
+			   req_data.fd, rc);
+		return rc;
+	}
+	ipoib_dbg(priv, "ioctl_getsgid: subnet_prefix=0x%llx\n",
+		  req_data.subnet_prefix);
+	ipoib_dbg(priv, "ioctl_getsgid: src_gid=0x%llx\n", req_data.gid);
+	rc = copy_to_user(ifr->ifr_data, &req_data,
+			  sizeof(struct ipoib_ioctl_getsgid_data));
+	if (rc != 0) {
+		ipoib_warn(priv,
+			   "ioctl fail to copy back request data\n");
+		return -EINVAL;
+	}
+
+	return rc;
+}
+
+int ipoib_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	int rc = -EINVAL;
+
+	switch (cmd) {
+	case IPOIBGETSGUID:
+		rc = ipoib_ioctl_getsguid(dev, ifr);
+		if (rc != 0)
+			return -EINVAL;
+		break;
+	default:
+		ipoib_warn(priv, "invalid ioctl opcode 0x%x\n", cmd);
+		rc = -EINVAL;
+		break;
+	}
+
+	return rc;
+}
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index babba05..15665af 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1619,6 +1619,7 @@ static const struct net_device_ops ipoib_netdev_ops = {
 	.ndo_tx_timeout		 = ipoib_timeout,
 	.ndo_set_rx_mode	 = ipoib_set_mcast_list,
 	.ndo_get_iflink		 = ipoib_get_iflink,
+	.ndo_do_ioctl		 = ipoib_do_ioctl,
 };
 
 void ipoib_setup(struct net_device *dev)
@@ -1962,6 +1963,11 @@ static void ipoib_add_one(struct ib_device *device)
 	ib_set_client_data(device, &ipoib_client, dev_list);
 }
 
+struct list_head *ipoib_get_dev_list(struct ib_device *dev)
+{
+	return ib_get_client_data(dev, &ipoib_client);
+}
+
 static void ipoib_remove_one(struct ib_device *device, void *client_data)
 {
 	struct ipoib_dev_priv *priv, *tmp;
-- 
1.7.1

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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Or Gerlitz]

On 12/31/2015 4:41 PM, Yuval Shaia wrote:
> To support security applications, that need to filter out connections based
> on SGID, an ioctl command to retrieve SGID of a given socket is added.
[...]

+
+found:
+	if (!(neigh->nud_state & NUD_VALID))
+		return -EINVAL;
+
+	gid = (union ib_gid *)(neigh->ha + 4);
+	*sgid = be64_to_cpu(gid->global.interface_id);
+	*subnet_prefix = be64_to_cpu(gid->global.subnet_prefix);


wait (1st)

the neighbour holds a destination address, not source address, so why 
are you talking on SGID?!

wait (2nd)

what prevents you from getting this info in user space through netlink 
from the kernel rtnl routing/neighbour services?

> root@r-dcs54 ~]# ip r s  | grep 192.168.20.0/24
> 192.168.20.0/24 dev ib0  proto kernel  scope link  src 192.168.20.17

> [root@r-dcs54 ~]# ip n s  | grep ib0
> 192.168.20.18 dev ib0 lladdr 
> 80:00:00:48:fe:80:00:00:00:00:00:00:f4:52:14:03:00:01:da:81 DELAY


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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Haggai Eran]

On 31/12/2015 16:41, Yuval Shaia wrote:
> To support security applications, that need to filter out connections based
> on SGID, an ioctl command to retrieve SGID of a given socket is added.

Could you elaborate on the security applications? How do you see this ioctl 
being used?

> diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ioctl.c b/drivers/infiniband/ulp/ipoib/ipoib_ioctl.c
> new file mode 100644
> index 0000000..124d545
> --- /dev/null
> +++ b/drivers/infiniband/ulp/ipoib/ipoib_ioctl.c

> +static int ipoib_get_sguid(struct net_device *dev, int fd, u64 *sgid,
> +			   u64 *subnet_prefix)
A GID is composed of a GUID and a subnet prefix.

> +{
> +	struct socket *sock;
> +	struct inet_sock *inetsock;
> +	struct neighbour *neigh;
> +	int rc = 0;
> +	union ib_gid *gid;
> +	struct list_head *dev_list = 0;
> +	struct ipoib_dev_priv *priv = netdev_priv(dev);
> +	u16 pkey_index = priv->pkey_index;
> +	struct ipoib_dev_priv *child_priv;
> +
> +	sock = sockfd_lookup(fd, &rc);
> +	if (IS_ERR_OR_NULL(sock))
> +		return -EINVAL;
> +
> +	inetsock = inet_sk(sock->sk);
> +
> +	neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr, dev);

Also, isn't inet_daddr the destination address? But the function claims 
to return the SGID. I guess these can be ambiguous but still it seems 
confusing.

> +	if (!IS_ERR_OR_NULL(neigh))
> +		goto found;
> +
> +	/* If not found try in all other ipoib devices */
> +	dev_list = ipoib_get_dev_list(priv->ca);
> +	if (!dev_list)
> +		return -EINVAL;
> +
> +	list_for_each_entry(priv, dev_list, list) {
This list can contain devices that belong to a different namespace. It
doesn't make sense to do a neighbor lookup on these. Also, you can simply use 
neigh_lookup_nodev if you don't care about the device.

> +		if (priv->pkey_index == pkey_index) {
> +			neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr,
> +					     priv->dev);
> +			if (!IS_ERR_OR_NULL(neigh))
> +				goto found;
> +		}
> +		list_for_each_entry(child_priv, &priv->child_intfs, list) {
> +			if (child_priv->pkey_index == pkey_index) {
> +				neigh = neigh_lookup(&arp_tbl,
> +						     &inetsock->inet_daddr,
> +						     child_priv->dev);
> +				if (!IS_ERR_OR_NULL(neigh))
> +					goto found;
> +			}
> +		}
> +	}
> +
> +	return -ENODEV;
> +
> +found:
> +	if (!(neigh->nud_state & NUD_VALID))
> +		return -EINVAL;
> +
> +	gid = (union ib_gid *)(neigh->ha + 4);
If you just take the GID from the hardware address why not do that from userspace?
Why do you need a new ioctl to do that for you?

> +	*sgid = be64_to_cpu(gid->global.interface_id);
> +	*subnet_prefix = be64_to_cpu(gid->global.subnet_prefix);
> +
> +	neigh_release(neigh);
> +
> +	return 0;
> +}

Regards,
Haggai

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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Yuval Shaia]

> > +
> > +	gid = (union ib_gid *)(neigh->ha + 4);
> If you just take the GID from the hardware address why not do that from userspace?
Will do.
Thanks.
> Why do you need a new ioctl to do that for you?
> 
> 
> Regards,
> Haggai
> 
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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Yuval Shaia]

On Thu, Dec 31, 2015 at 05:31:44PM +0200, Or Gerlitz wrote:
> 
> wait (2nd)
> 
> what prevents you from getting this info in user space through
> netlink from the kernel rtnl routing/neighbour services?
Thanks.
> 
> 
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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Yuval Shaia]

On Thu, Dec 31, 2015 at 05:34:03PM +0200, Haggai Eran wrote:
> > +	sock = sockfd_lookup(fd, &rc);
> > +	if (IS_ERR_OR_NULL(sock))
> > +		return -EINVAL;
> > +
> > +	inetsock = inet_sk(sock->sk);
> > +
> > +	neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr, dev);
> 
> Also, isn't inet_daddr the destination address? But the function claims 
> to return the SGID. I guess these can be ambiguous but still it seems 
> confusing.
Per description in include/net/inet_sock.h looks like that inet_daddr is
the address of source peer of the socket.
* @inet_daddr - Foreign IPv4 addr
> 
> 
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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Haggai Eran]

On 06/01/2016 13:03, Yuval Shaia wrote:
> On Thu, Dec 31, 2015 at 05:34:03PM +0200, Haggai Eran wrote:
>>> +	sock = sockfd_lookup(fd, &rc);
>>> +	if (IS_ERR_OR_NULL(sock))
>>> +		return -EINVAL;
>>> +
>>> +	inetsock = inet_sk(sock->sk);
>>> +
>>> +	neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr, dev);
>>
>> Also, isn't inet_daddr the destination address? But the function claims 
>> to return the SGID. I guess these can be ambiguous but still it seems 
>> confusing.
> Per description in include/net/inet_sock.h looks like that inet_daddr is
> the address of source peer of the socket.
> * @inet_daddr - Foreign IPv4 addr
>>

I meant it was confusing to have the foreign address in the socket designated 
by "daddr" while the function you proposed returned the foreign GID as SGID.

Haggai

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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Yuval Shaia]

On Wed, Jan 06, 2016 at 02:25:52PM +0200, Haggai Eran wrote:
> On 06/01/2016 13:03, Yuval Shaia wrote:
> > On Thu, Dec 31, 2015 at 05:34:03PM +0200, Haggai Eran wrote:
> >>> +	sock = sockfd_lookup(fd, &rc);
> >>> +	if (IS_ERR_OR_NULL(sock))
> >>> +		return -EINVAL;
> >>> +
> >>> +	inetsock = inet_sk(sock->sk);
> >>> +
> >>> +	neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr, dev);
> >>
> >> Also, isn't inet_daddr the destination address? But the function claims 
> >> to return the SGID. I guess these can be ambiguous but still it seems 
> >> confusing.
> > Per description in include/net/inet_sock.h looks like that inet_daddr is
> > the address of source peer of the socket.
> > * @inet_daddr - Foreign IPv4 addr
> >>
> 
> I meant it was confusing to have the foreign address in the socket designated 
> by "daddr" while the function you proposed returned the foreign GID as SGID.
I see.
Function was meant to extract GID of source peer of the socket.
Anyway, i gave up this this patch so we only talking semantics here :)
> 
> Haggai
> 
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Re: [PATCH] IB/ipoib: Expose ioctl command to retrieve SGID of a given socket

[Doug Ledford]

[-- Attachment #1: Type: text/plain, Size: 1295 bytes --]

On 01/06/2016 08:10 AM, Yuval Shaia wrote:
> On Wed, Jan 06, 2016 at 02:25:52PM +0200, Haggai Eran wrote:
>> On 06/01/2016 13:03, Yuval Shaia wrote:
>>> On Thu, Dec 31, 2015 at 05:34:03PM +0200, Haggai Eran wrote:
>>>>> +	sock = sockfd_lookup(fd, &rc);
>>>>> +	if (IS_ERR_OR_NULL(sock))
>>>>> +		return -EINVAL;
>>>>> +
>>>>> +	inetsock = inet_sk(sock->sk);
>>>>> +
>>>>> +	neigh = neigh_lookup(&arp_tbl, &inetsock->inet_daddr, dev);
>>>>
>>>> Also, isn't inet_daddr the destination address? But the function claims 
>>>> to return the SGID. I guess these can be ambiguous but still it seems 
>>>> confusing.
>>> Per description in include/net/inet_sock.h looks like that inet_daddr is
>>> the address of source peer of the socket.
>>> * @inet_daddr - Foreign IPv4 addr
>>>>
>>
>> I meant it was confusing to have the foreign address in the socket designated 
>> by "daddr" while the function you proposed returned the foreign GID as SGID.
> I see.
> Function was meant to extract GID of source peer of the socket.
> Anyway, i gave up this this patch so we only talking semantics here :)

Per your comment, I've dropped this patch from any consideration.


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              GPG KeyID: 0E572FDD



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