net/bridge/br_vlan.c - maze/linux - Git at Google

 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/slab.h>

 #include "br_private.h"

 static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
 {
 	if (v->pvid == vid)
 		return;

 	smp_wmb();
 	v->pvid = vid;
 }

 static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
 {
 	if (v->pvid != vid)
 		return;

 	smp_wmb();
 	v->pvid = 0;
 }

 static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
 {
 	if (flags & BRIDGE_VLAN_INFO_PVID)
 		__vlan_add_pvid(v, vid);

 	if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
 		set_bit(vid, v->untagged_bitmap);
 }

 static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
 {
 	struct net_bridge_port *p = NULL;
 	struct net_bridge *br;
 	struct net_device *dev;
 	int err;

 	if (test_bit(vid, v->vlan_bitmap)) {
 		__vlan_add_flags(v, vid, flags);
 		return 0;
 	}

 	if (v->port_idx) {
 		p = v->parent.port;
 		br = p->br;
 		dev = p->dev;
 	} else {
 		br = v->parent.br;
 		dev = br->dev;
 	}

 	if (p) {
 		/* Add VLAN to the device filter if it is supported.
 		 * Stricly speaking, this is not necessary now, since
 		 * devices are made promiscuous by the bridge, but if
 		 * that ever changes this code will allow tagged
 		 * traffic to enter the bridge.
 		 */
 		err = vlan_vid_add(dev, htons(ETH_P_8021Q), vid);
 		if (err)
 			return err;
 	}

 	err = br_fdb_insert(br, p, dev->dev_addr, vid);
 	if (err) {
 		br_err(br, "failed insert local address into bridge "
 		       "forwarding table\n");
 		goto out_filt;
 	}

 	set_bit(vid, v->vlan_bitmap);
 	v->num_vlans++;
 	__vlan_add_flags(v, vid, flags);

 	return 0;

 out_filt:
 	if (p)
 		vlan_vid_del(dev, htons(ETH_P_8021Q), vid);
 	return err;
 }

 static int __vlan_del(struct net_port_vlans *v, u16 vid)
 {
 	if (!test_bit(vid, v->vlan_bitmap))
 		return -EINVAL;

 	__vlan_delete_pvid(v, vid);
 	clear_bit(vid, v->untagged_bitmap);

 	if (v->port_idx)
 		vlan_vid_del(v->parent.port->dev, htons(ETH_P_8021Q), vid);

 	clear_bit(vid, v->vlan_bitmap);
 	v->num_vlans--;
 	if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
 		if (v->port_idx)
 			RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
 		else
 			RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
 		kfree_rcu(v, rcu);
 	}
 	return 0;
 }

 static void __vlan_flush(struct net_port_vlans *v)
 {
 	smp_wmb();
 	v->pvid = 0;
 	bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
 	if (v->port_idx)
 		RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
 	else
 		RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
 	kfree_rcu(v, rcu);
 }

 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 			       const struct net_port_vlans *pv,
 			       struct sk_buff *skb)
 {
 	u16 vid;

 	if (!br->vlan_enabled)
 		goto out;

 	/* Vlan filter table must be configured at this point.  The
 	 * only exception is the bridge is set in promisc mode and the
 	 * packet is destined for the bridge device.  In this case
 	 * pass the packet as is.
 	 */
 	if (!pv) {
 		if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 			goto out;
 		} else {
 			kfree_skb(skb);
 			return NULL;
 		}
 	}

 	/* At this point, we know that the frame was filtered and contains
 	 * a valid vlan id.  If the vlan id is set in the untagged bitmap,
 	 * send untagged; otherwise, send tagged.
 	 */
 	br_vlan_get_tag(skb, &vid);
 	if (test_bit(vid, pv->untagged_bitmap))
 		skb->vlan_tci = 0;

 out:
 	return skb;
 }

 /* Called under RCU */
 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 			struct sk_buff *skb, u16 *vid)
 {
 	int err;

 	/* If VLAN filtering is disabled on the bridge, all packets are
 	 * permitted.
 	 */
 	if (!br->vlan_enabled)
 		return true;

 	/* If there are no vlan in the permitted list, all packets are
 	 * rejected.
 	 */
 	if (!v)
 		goto drop;

 	/* If vlan tx offload is disabled on bridge device and frame was
 	 * sent from vlan device on the bridge device, it does not have
 	 * HW accelerated vlan tag.
 	 */
 	if (unlikely(!vlan_tx_tag_present(skb) &&
 		     (skb->protocol == htons(ETH_P_8021Q) ||
 		      skb->protocol == htons(ETH_P_8021AD)))) {
 		skb = vlan_untag(skb);
 		if (unlikely(!skb))
 			return false;
 	}

 	err = br_vlan_get_tag(skb, vid);
 	if (!*vid) {
 		u16 pvid = br_get_pvid(v);

 		/* Frame had a tag with VID 0 or did not have a tag.
 		 * See if pvid is set on this port.  That tells us which
 		 * vlan untagged or priority-tagged traffic belongs to.
 		 */
 		if (pvid == VLAN_N_VID)
 			goto drop;

 		/* PVID is set on this port.  Any untagged or priority-tagged
 		 * ingress frame is considered to belong to this vlan.
 		 */
 		*vid = pvid;
 		if (likely(err))
 			/* Untagged Frame. */
 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), pvid);
 		else
 			/* Priority-tagged Frame.
 			 * At this point, We know that skb->vlan_tci had
 			 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
 			 * We update only VID field and preserve PCP field.
 			 */
 			skb->vlan_tci |= pvid;

 		return true;
 	}

 	/* Frame had a valid vlan tag.  See if vlan is allowed */
 	if (test_bit(*vid, v->vlan_bitmap))
 		return true;
 drop:
 	kfree_skb(skb);
 	return false;
 }

 /* Called under RCU. */
 bool br_allowed_egress(struct net_bridge *br,
 		       const struct net_port_vlans *v,
 		       const struct sk_buff *skb)
 {
 	u16 vid;

 	if (!br->vlan_enabled)
 		return true;

 	if (!v)
 		return false;

 	br_vlan_get_tag(skb, &vid);
 	if (test_bit(vid, v->vlan_bitmap))
 		return true;

 	return false;
 }

 /* Must be protected by RTNL.
  * Must be called with vid in range from 1 to 4094 inclusive.
  */
 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 {
 	struct net_port_vlans *pv = NULL;
 	int err;

 	ASSERT_RTNL();

 	pv = rtnl_dereference(br->vlan_info);
 	if (pv)
 		return __vlan_add(pv, vid, flags);

 	/* Create port vlan infomration
 	 */
 	pv = kzalloc(sizeof(*pv), GFP_KERNEL);
 	if (!pv)
 		return -ENOMEM;

 	pv->parent.br = br;
 	err = __vlan_add(pv, vid, flags);
 	if (err)
 		goto out;

 	rcu_assign_pointer(br->vlan_info, pv);
 	return 0;
 out:
 	kfree(pv);
 	return err;
 }

 /* Must be protected by RTNL.
  * Must be called with vid in range from 1 to 4094 inclusive.
  */
 int br_vlan_delete(struct net_bridge *br, u16 vid)
 {
 	struct net_port_vlans *pv;

 	ASSERT_RTNL();

 	pv = rtnl_dereference(br->vlan_info);
 	if (!pv)
 		return -EINVAL;

 	br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);

 	__vlan_del(pv, vid);
 	return 0;
 }

 void br_vlan_flush(struct net_bridge *br)
 {
 	struct net_port_vlans *pv;

 	ASSERT_RTNL();
 	pv = rtnl_dereference(br->vlan_info);
 	if (!pv)
 		return;

 	__vlan_flush(pv);
 }

 bool br_vlan_find(struct net_bridge *br, u16 vid)
 {
 	struct net_port_vlans *pv;
 	bool found = false;

 	rcu_read_lock();
 	pv = rcu_dereference(br->vlan_info);

 	if (!pv)
 		goto out;

 	if (test_bit(vid, pv->vlan_bitmap))
 		found = true;

 out:
 	rcu_read_unlock();
 	return found;
 }

 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 {
 	if (!rtnl_trylock())
 		return restart_syscall();

 	if (br->vlan_enabled == val)
 		goto unlock;

 	br->vlan_enabled = val;

 unlock:
 	rtnl_unlock();
 	return 0;
 }

 /* Must be protected by RTNL.
  * Must be called with vid in range from 1 to 4094 inclusive.
  */
 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 {
 	struct net_port_vlans *pv = NULL;
 	int err;

 	ASSERT_RTNL();

 	pv = rtnl_dereference(port->vlan_info);
 	if (pv)
 		return __vlan_add(pv, vid, flags);

 	/* Create port vlan infomration
 	 */
 	pv = kzalloc(sizeof(*pv), GFP_KERNEL);
 	if (!pv) {
 		err = -ENOMEM;
 		goto clean_up;
 	}

 	pv->port_idx = port->port_no;
 	pv->parent.port = port;
 	err = __vlan_add(pv, vid, flags);
 	if (err)
 		goto clean_up;

 	rcu_assign_pointer(port->vlan_info, pv);
 	return 0;

 clean_up:
 	kfree(pv);
 	return err;
 }

 /* Must be protected by RTNL.
  * Must be called with vid in range from 1 to 4094 inclusive.
  */
 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 {
 	struct net_port_vlans *pv;

 	ASSERT_RTNL();

 	pv = rtnl_dereference(port->vlan_info);
 	if (!pv)
 		return -EINVAL;

 	br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);

 	return __vlan_del(pv, vid);
 }

 void nbp_vlan_flush(struct net_bridge_port *port)
 {
 	struct net_port_vlans *pv;
 	u16 vid;

 	ASSERT_RTNL();

 	pv = rtnl_dereference(port->vlan_info);
 	if (!pv)
 		return;

 	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
 		vlan_vid_del(port->dev, htons(ETH_P_8021Q), vid);

 	__vlan_flush(pv);
 }

 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 {
 	struct net_port_vlans *pv;
 	bool found = false;

 	rcu_read_lock();
 	pv = rcu_dereference(port->vlan_info);

 	if (!pv)
 		goto out;

 	if (test_bit(vid, pv->vlan_bitmap))
 		found = true;

 out:
 	rcu_read_unlock();
 	return found;
 }
	#include <linux/kernel.h>
	#include <linux/netdevice.h>
	#include <linux/rtnetlink.h>
	#include <linux/slab.h>

	#include "br_private.h"

	static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
	{
	if (v->pvid == vid)
	return;

	smp_wmb();
	v->pvid = vid;
	}

	static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
	{
	if (v->pvid != vid)
	return;

	smp_wmb();
	v->pvid = 0;
	}

	static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
	{
	if (flags & BRIDGE_VLAN_INFO_PVID)
	__vlan_add_pvid(v, vid);

	if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
	set_bit(vid, v->untagged_bitmap);
	}

	static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
	{
	struct net_bridge_port *p = NULL;
	struct net_bridge *br;
	struct net_device *dev;
	int err;

	if (test_bit(vid, v->vlan_bitmap)) {
	__vlan_add_flags(v, vid, flags);
	return 0;
	}

	if (v->port_idx) {
	p = v->parent.port;
	br = p->br;
	dev = p->dev;
	} else {
	br = v->parent.br;
	dev = br->dev;
	}

	if (p) {
	/* Add VLAN to the device filter if it is supported.
	* Stricly speaking, this is not necessary now, since
	* devices are made promiscuous by the bridge, but if
	* that ever changes this code will allow tagged
	* traffic to enter the bridge.
	*/
	err = vlan_vid_add(dev, htons(ETH_P_8021Q), vid);
	if (err)
	return err;
	}

	err = br_fdb_insert(br, p, dev->dev_addr, vid);
	if (err) {
	br_err(br, "failed insert local address into bridge "
	"forwarding table\n");
	goto out_filt;
	}

	set_bit(vid, v->vlan_bitmap);
	v->num_vlans++;
	__vlan_add_flags(v, vid, flags);

	return 0;

	out_filt:
	if (p)
	vlan_vid_del(dev, htons(ETH_P_8021Q), vid);
	return err;
	}

	static int __vlan_del(struct net_port_vlans *v, u16 vid)
	{
	if (!test_bit(vid, v->vlan_bitmap))
	return -EINVAL;

	__vlan_delete_pvid(v, vid);
	clear_bit(vid, v->untagged_bitmap);

	if (v->port_idx)
	vlan_vid_del(v->parent.port->dev, htons(ETH_P_8021Q), vid);

	clear_bit(vid, v->vlan_bitmap);
	v->num_vlans--;
	if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
	if (v->port_idx)
	RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
	else
	RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
	kfree_rcu(v, rcu);
	}
	return 0;
	}

	static void __vlan_flush(struct net_port_vlans *v)
	{
	smp_wmb();
	v->pvid = 0;
	bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
	if (v->port_idx)
	RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
	else
	RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
	kfree_rcu(v, rcu);
	}

	struct sk_buff br_handle_vlan(struct net_bridge br,
	const struct net_port_vlans *pv,
	struct sk_buff *skb)
	{
	u16 vid;

	if (!br->vlan_enabled)
	goto out;

	/* Vlan filter table must be configured at this point. The
	* only exception is the bridge is set in promisc mode and the
	* packet is destined for the bridge device. In this case
	* pass the packet as is.
	*/
	if (!pv) {
	if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
	goto out;
	} else {
	kfree_skb(skb);
	return NULL;
	}
	}

	/* At this point, we know that the frame was filtered and contains
	* a valid vlan id. If the vlan id is set in the untagged bitmap,
	* send untagged; otherwise, send tagged.
	*/
	br_vlan_get_tag(skb, &vid);
	if (test_bit(vid, pv->untagged_bitmap))
	skb->vlan_tci = 0;

	out:
	return skb;
	}

	/* Called under RCU */
	bool br_allowed_ingress(struct net_bridge br, struct net_port_vlans v,
	struct sk_buff skb, u16 vid)
	{
	int err;

	/* If VLAN filtering is disabled on the bridge, all packets are
	* permitted.
	*/
	if (!br->vlan_enabled)
	return true;

	/* If there are no vlan in the permitted list, all packets are
	* rejected.
	*/
	if (!v)
	goto drop;

	/* If vlan tx offload is disabled on bridge device and frame was
	* sent from vlan device on the bridge device, it does not have
	* HW accelerated vlan tag.
	*/
	if (unlikely(!vlan_tx_tag_present(skb) &&
	(skb->protocol == htons(ETH_P_8021Q) \|\|
	skb->protocol == htons(ETH_P_8021AD)))) {
	skb = vlan_untag(skb);
	if (unlikely(!skb))
	return false;
	}

	err = br_vlan_get_tag(skb, vid);
	if (!*vid) {
	u16 pvid = br_get_pvid(v);

	/* Frame had a tag with VID 0 or did not have a tag.
	* See if pvid is set on this port. That tells us which
	* vlan untagged or priority-tagged traffic belongs to.
	*/
	if (pvid == VLAN_N_VID)
	goto drop;

	/* PVID is set on this port. Any untagged or priority-tagged
	* ingress frame is considered to belong to this vlan.
	*/
	*vid = pvid;
	if (likely(err))
	/* Untagged Frame. */
	__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), pvid);
	else
	/* Priority-tagged Frame.
	* At this point, We know that skb->vlan_tci had
	* VLAN_TAG_PRESENT bit and its VID field was 0x000.
	* We update only VID field and preserve PCP field.
	*/
	skb->vlan_tci \|= pvid;

	return true;
	}

	/* Frame had a valid vlan tag. See if vlan is allowed */
	if (test_bit(*vid, v->vlan_bitmap))
	return true;
	drop:
	kfree_skb(skb);
	return false;
	}

	/* Called under RCU. */
	bool br_allowed_egress(struct net_bridge *br,
	const struct net_port_vlans *v,
	const struct sk_buff *skb)
	{
	u16 vid;

	if (!br->vlan_enabled)
	return true;

	if (!v)
	return false;

	br_vlan_get_tag(skb, &vid);
	if (test_bit(vid, v->vlan_bitmap))
	return true;

	return false;
	}

	/* Must be protected by RTNL.
	* Must be called with vid in range from 1 to 4094 inclusive.
	*/
	int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
	{
	struct net_port_vlans *pv = NULL;
	int err;

	ASSERT_RTNL();

	pv = rtnl_dereference(br->vlan_info);
	if (pv)
	return __vlan_add(pv, vid, flags);

	/* Create port vlan infomration
	*/
	pv = kzalloc(sizeof(*pv), GFP_KERNEL);
	if (!pv)
	return -ENOMEM;

	pv->parent.br = br;
	err = __vlan_add(pv, vid, flags);
	if (err)
	goto out;

	rcu_assign_pointer(br->vlan_info, pv);
	return 0;
	out:
	kfree(pv);
	return err;
	}

	/* Must be protected by RTNL.
	* Must be called with vid in range from 1 to 4094 inclusive.
	*/
	int br_vlan_delete(struct net_bridge *br, u16 vid)
	{
	struct net_port_vlans *pv;

	ASSERT_RTNL();

	pv = rtnl_dereference(br->vlan_info);
	if (!pv)
	return -EINVAL;

	br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);

	__vlan_del(pv, vid);
	return 0;
	}

	void br_vlan_flush(struct net_bridge *br)
	{
	struct net_port_vlans *pv;

	ASSERT_RTNL();
	pv = rtnl_dereference(br->vlan_info);
	if (!pv)
	return;

	__vlan_flush(pv);
	}

	bool br_vlan_find(struct net_bridge *br, u16 vid)
	{
	struct net_port_vlans *pv;
	bool found = false;

	rcu_read_lock();
	pv = rcu_dereference(br->vlan_info);

	if (!pv)
	goto out;

	if (test_bit(vid, pv->vlan_bitmap))
	found = true;

	out:
	rcu_read_unlock();
	return found;
	}

	int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
	{
	if (!rtnl_trylock())
	return restart_syscall();

	if (br->vlan_enabled == val)
	goto unlock;

	br->vlan_enabled = val;

	unlock:
	rtnl_unlock();
	return 0;
	}

	/* Must be protected by RTNL.
	* Must be called with vid in range from 1 to 4094 inclusive.
	*/
	int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
	{
	struct net_port_vlans *pv = NULL;
	int err;

	ASSERT_RTNL();

	pv = rtnl_dereference(port->vlan_info);
	if (pv)
	return __vlan_add(pv, vid, flags);

	/* Create port vlan infomration
	*/
	pv = kzalloc(sizeof(*pv), GFP_KERNEL);
	if (!pv) {
	err = -ENOMEM;
	goto clean_up;
	}

	pv->port_idx = port->port_no;
	pv->parent.port = port;
	err = __vlan_add(pv, vid, flags);
	if (err)
	goto clean_up;

	rcu_assign_pointer(port->vlan_info, pv);
	return 0;

	clean_up:
	kfree(pv);
	return err;
	}

	/* Must be protected by RTNL.
	* Must be called with vid in range from 1 to 4094 inclusive.
	*/
	int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
	{
	struct net_port_vlans *pv;

	ASSERT_RTNL();

	pv = rtnl_dereference(port->vlan_info);
	if (!pv)
	return -EINVAL;

	br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);

	return __vlan_del(pv, vid);
	}

	void nbp_vlan_flush(struct net_bridge_port *port)
	{
	struct net_port_vlans *pv;
	u16 vid;

	ASSERT_RTNL();

	pv = rtnl_dereference(port->vlan_info);
	if (!pv)
	return;

	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
	vlan_vid_del(port->dev, htons(ETH_P_8021Q), vid);

	__vlan_flush(pv);
	}

	bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
	{
	struct net_port_vlans *pv;
	bool found = false;

	rcu_read_lock();
	pv = rcu_dereference(port->vlan_info);

	if (!pv)
	goto out;

	if (test_bit(vid, pv->vlan_bitmap))
	found = true;

	out:
	rcu_read_unlock();
	return found;
	}