[PATCH v3 net 0/2] bridge: Fix forwarding of 8021AD frames

[PATCH v3 net 0/2] bridge: Fix forwarding of 8021AD frames

[Vlad Yasevich]

Bridge has its own way to deterine if the packet is forwardable and it doesn't
support 8021ad tags correctly.  Instead just allow bridge to use an
existing is_skb_forwardable() function.

v2: Fix missing hunk in patch 2/2 to make it build.

v3: Fix indent for is_skb_forwardable


Vlad Yasevich (2):
  net: Allow modules to use is_skb_forwardable
  bridge: use is_skb_forwardable in forward path

 include/linux/netdevice.h | 1 +
 net/bridge/br_forward.c   | 9 ++-------
 net/core/dev.c            | 3 ++-
 3 files changed, 5 insertions(+), 8 deletions(-)

-- 
1.8.5.3

[PATCH v3 net 1/2] net: Allow modules to use is_skb_forwardable

[Vlad Yasevich]

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
---
 include/linux/netdevice.h | 1 +
 net/core/dev.c            | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e8eeebd..d855794 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2551,6 +2551,7 @@ int dev_get_phys_port_id(struct net_device *dev,
 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 			struct netdev_queue *txq);
 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
+bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb);
 
 extern int		netdev_budget;
 
diff --git a/net/core/dev.c b/net/core/dev.c
index b1b0c8d..b3639c7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1645,8 +1645,7 @@ static inline void net_timestamp_set(struct sk_buff *skb)
 			__net_timestamp(SKB);		\
 	}						\
 
-static inline bool is_skb_forwardable(struct net_device *dev,
-				      struct sk_buff *skb)
+bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
 {
 	unsigned int len;
 
@@ -1665,6 +1664,7 @@ static inline bool is_skb_forwardable(struct net_device *dev,
 
 	return false;
 }
+EXPORT_SYMBOL_GPL(is_skb_forwardable);
 
 /**
  * dev_forward_skb - loopback an skb to another netif
-- 
1.8.5.3

[PATCH v3 net 2/2] bridge: use is_skb_forwardable in forward path

[Vlad Yasevich]

Use existing function instead of trying to use our own.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
---
 net/bridge/br_forward.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index d3409e6..056b67b 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -35,16 +35,11 @@ static inline int should_deliver(const struct net_bridge_port *p,
 		p->state == BR_STATE_FORWARDING;
 }
 
-static inline unsigned int packet_length(const struct sk_buff *skb)
-{
-	return skb->len - (skb->protocol == htons(ETH_P_8021Q) ? VLAN_HLEN : 0);
-}
-
 int br_dev_queue_push_xmit(struct sk_buff *skb)
 {
 	/* ip_fragment doesn't copy the MAC header */
 	if (nf_bridge_maybe_copy_header(skb) ||
-	    (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb))) {
+	    !is_skb_forwardable(skb->dev, skb)) {
 		kfree_skb(skb);
 	} else {
 		skb_push(skb, ETH_HLEN);
@@ -71,7 +66,7 @@ static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
 	skb->dev = to->dev;
 
 	if (unlikely(netpoll_tx_running(to->br->dev))) {
-		if (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb))
+		if (!is_skb_forwardable(skb->dev, skb))
 			kfree_skb(skb);
 		else {
 			skb_push(skb, ETH_HLEN);
-- 
1.8.5.3

Re: [PATCH v3 net 0/2] bridge: Fix forwarding of 8021AD frames

[David Miller]

From: Vlad Yasevich <vyasevic@redhat.com>
Date: Thu, 27 Mar 2014 17:32:28 -0400

> Bridge has its own way to deterine if the packet is forwardable and it doesn't
> support 8021ad tags correctly.  Instead just allow bridge to use an
> existing is_skb_forwardable() function.
> 
> v2: Fix missing hunk in patch 2/2 to make it build.
> 
> v3: Fix indent for is_skb_forwardable

Applied to net-next, if you really want this to be queued up for -stable
let me know.