Commit d4619336 authored by Vladimir Oltean's avatar Vladimir Oltean Committed by David S. Miller
Browse files

net: dsa: tag_8021q: Create helper function for removing VLAN header 



This removes the existing implementation from tag_sja1105, which was
partially incorrect (it was not changing the MAC header offset, thereby
leaving it to point 4 bytes earlier than it should have).

This overwrites the VLAN tag by moving the Ethernet source and
destination MACs 4 bytes to the right. Then skb->data (assumed to be
pointing immediately after the EtherType) is temporarily pushed to the
beginning of the new Ethernet header, the new Ethernet header offset and
length are recorded, then skb->data is moved back to where it was.

Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5e3f847a

include/linux/dsa/8021q.h

+7 −9
Original line number Diff line number Diff line
@@ -20,9 +20,6 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int index, 
struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,

			       u16 tpid, u16 tci);



struct sk_buff *dsa_8021q_rcv(struct sk_buff *skb, struct net_device *netdev,

			      struct packet_type *pt, u16 *tpid, u16 *tci);



u16 dsa_8021q_tx_vid(struct dsa_switch *ds, int port);



u16 dsa_8021q_rx_vid(struct dsa_switch *ds, int port);
@@ -31,6 +28,8 @@ int dsa_8021q_rx_switch_id(u16 vid); 


int dsa_8021q_rx_source_port(u16 vid);



struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb);



#else



int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int index,
@@ -45,12 +44,6 @@ struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev, 
	return NULL;

}



struct sk_buff *dsa_8021q_rcv(struct sk_buff *skb, struct net_device *netdev,

			      struct packet_type *pt, u16 *tpid, u16 *tci)

{

	return NULL;

}



u16 dsa_8021q_tx_vid(struct dsa_switch *ds, int port)

{

	return 0;
@@ -71,6 +64,11 @@ int dsa_8021q_rx_source_port(u16 vid) 
	return 0;

}



struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb)

{

	return NULL;

}



#endif /* IS_ENABLED(CONFIG_NET_DSA_TAG_8021Q) */



#endif /* _NET_DSA_8021Q_H */

net/dsa/tag_8021q.c

+37 −20
Original line number Diff line number Diff line
@@ -235,31 +235,48 @@ struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev, 
}

EXPORT_SYMBOL_GPL(dsa_8021q_xmit);



struct sk_buff *dsa_8021q_rcv(struct sk_buff *skb, struct net_device *netdev,

			      struct packet_type *pt, u16 *tpid, u16 *tci)

{

	struct vlan_ethhdr *tag;



	if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))

		return NULL;



	tag = vlan_eth_hdr(skb);

	*tpid = ntohs(tag->h_vlan_proto);

	*tci = ntohs(tag->h_vlan_TCI);



	/* skb->data points in the middle of the VLAN tag,

	 * after tpid and before tci. This is because so far,

	 * ETH_HLEN (DMAC, SMAC, EtherType) bytes were pulled.

/* In the DSA packet_type handler, skb->data points in the middle of the VLAN

 * tag, after tpid and before tci. This is because so far, ETH_HLEN

 * (DMAC, SMAC, EtherType) bytes were pulled.

 * There are 2 bytes of VLAN tag left in skb->data, and upper

 * layers expect the 'real' EtherType to be consumed as well.

 * Coincidentally, a VLAN header is also of the same size as

 * the number of bytes that need to be pulled.

 *

 * skb_mac_header                                      skb->data

 * |                                                       |

 * v                                                       v

 * |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

 * +-----------------------+-----------------------+-------+-------+-------+

 * |    Destination MAC    |      Source MAC       |  TPID |  TCI  | EType |

 * +-----------------------+-----------------------+-------+-------+-------+

 * ^                                               |               |

 * |<--VLAN_HLEN-->to                              <---VLAN_HLEN--->

 * from            |

 *       >>>>>>>   v

 *       >>>>>>>   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

 *       >>>>>>>   +-----------------------+-----------------------+-------+

 *       >>>>>>>   |    Destination MAC    |      Source MAC       | EType |

 *                 +-----------------------+-----------------------+-------+

 *                 ^                                                       ^

 * (now part of    |                                                       |

 *  skb->head)     skb_mac_header                                  skb->data

 */

	skb_pull_rcsum(skb, VLAN_HLEN);

struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb)

{

	u8 *from = skb_mac_header(skb);

	u8 *dest = from + VLAN_HLEN;



	memmove(dest, from, ETH_HLEN - VLAN_HLEN);

	skb_pull(skb, VLAN_HLEN);

	skb_push(skb, ETH_HLEN);

	skb_reset_mac_header(skb);

	skb_reset_mac_len(skb);

	skb_pull_rcsum(skb, ETH_HLEN);



	return skb;

}

EXPORT_SYMBOL_GPL(dsa_8021q_rcv);

EXPORT_SYMBOL_GPL(dsa_8021q_remove_header);



static const struct dsa_device_ops dsa_8021q_netdev_ops = {

	.name		= "8021q",

net/dsa/tag_sja1105.c

+9 −10
Original line number Diff line number Diff line
@@ -66,17 +66,14 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb, 
				   struct net_device *netdev,

				   struct packet_type *pt)

{

	struct ethhdr *hdr = eth_hdr(skb);

	u64 source_port, switch_id;

	struct sk_buff *nskb;

	int source_port, switch_id;

	struct vlan_ethhdr *hdr;

	u16 tpid, vid, tci;

	bool is_tagged;



	nskb = dsa_8021q_rcv(skb, netdev, pt, &tpid, &tci);

	is_tagged = (nskb && tpid == ETH_P_SJA1105);



	skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;

	vid = tci & VLAN_VID_MASK;

	hdr = vlan_eth_hdr(skb);

	tpid = ntohs(hdr->h_vlan_proto);

	is_tagged = (tpid == ETH_P_SJA1105);



	skb->offload_fwd_mark = 1;
@@ -92,8 +89,11 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb, 
		hdr->h_dest[4] = 0;

	} else {

		/* Normal traffic path. */

		tci = ntohs(hdr->h_vlan_TCI);

		vid = tci & VLAN_VID_MASK;

		source_port = dsa_8021q_rx_source_port(vid);

		switch_id = dsa_8021q_rx_switch_id(vid);

		skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;

	}



	skb->dev = dsa_master_find_slave(netdev, switch_id, source_port);
@@ -106,8 +106,7 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb, 
	 * it there, see dsa_switch_rcv: skb_push(skb, ETH_HLEN).

	 */

	if (is_tagged)

		memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - VLAN_HLEN,

			ETH_HLEN - VLAN_HLEN);

		skb = dsa_8021q_remove_header(skb);



	return skb;

}

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