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Commit 0b5c9db1 authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

vlan: Fix the ingress VLAN_FLAG_REORDER_HDR check 



Testing of VLAN_FLAG_REORDER_HDR does not belong in vlan_untag
but rather in vlan_do_receive.  Otherwise the vlan header
will not be properly put on the packet in the case of
vlan header accelleration.

As we remove the check from vlan_check_reorder_header
rename it vlan_reorder_header to keep the naming clean.

Fix up the skb->pkt_type early so we don't look at the packet
after adding the vlan tag, which guarantees we don't goof
and look at the wrong field.

Use a simple if statement instead of a complicated switch
statement to decided that we need to increment rx_stats
for a multicast packet.

Hopefully at somepoint we will just declare the case where
VLAN_FLAG_REORDER_HDR is cleared as unsupported and remove
the code.  Until then this keeps it working correctly.

Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarJiri Pirko <jpirko@redhat.com>
Acked-by: default avatarChangli Gao <xiaosuo@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 06866bf5

include/linux/if_vlan.h

+22 −3
Original line number Diff line number Diff line
@@ -225,7 +225,7 @@ static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, 
}



/**

 * __vlan_put_tag - regular VLAN tag inserting

 * vlan_insert_tag - regular VLAN tag inserting

 * @skb: skbuff to tag

 * @vlan_tci: VLAN TCI to insert

 *
@@ -234,8 +234,10 @@ static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, 
 *

 * Following the skb_unshare() example, in case of error, the calling function

 * doesn't have to worry about freeing the original skb.

 *

 * Does not change skb->protocol so this function can be used during receive.

 */

static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)

static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci)

{

	struct vlan_ethhdr *veth;
@@ -255,8 +257,25 @@ static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) 
	/* now, the TCI */

	veth->h_vlan_TCI = htons(vlan_tci);



	skb->protocol = htons(ETH_P_8021Q);

	return skb;

}



/**

 * __vlan_put_tag - regular VLAN tag inserting

 * @skb: skbuff to tag

 * @vlan_tci: VLAN TCI to insert

 *

 * Inserts the VLAN tag into @skb as part of the payload

 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.

 *

 * Following the skb_unshare() example, in case of error, the calling function

 * doesn't have to worry about freeing the original skb.

 */

static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)

{

	skb = vlan_insert_tag(skb, vlan_tci);

	if (skb)

		skb->protocol = htons(ETH_P_8021Q);

	return skb;

}

include/linux/skbuff.h

+5 −0
Original line number Diff line number Diff line
@@ -1256,6 +1256,11 @@ static inline void skb_reserve(struct sk_buff *skb, int len) 
	skb->tail += len;

}



static inline void skb_reset_mac_len(struct sk_buff *skb)

{

	skb->mac_len = skb->network_header - skb->mac_header;

}



#ifdef NET_SKBUFF_DATA_USES_OFFSET

static inline unsigned char *skb_transport_header(const struct sk_buff *skb)

{

net/8021q/vlan_core.c

+33 −27
Original line number Diff line number Diff line
@@ -23,6 +23,31 @@ bool vlan_do_receive(struct sk_buff **skbp) 
		return false;



	skb->dev = vlan_dev;

	if (skb->pkt_type == PACKET_OTHERHOST) {

		/* Our lower layer thinks this is not local, let's make sure.

		 * This allows the VLAN to have a different MAC than the

		 * underlying device, and still route correctly. */

		if (!compare_ether_addr(eth_hdr(skb)->h_dest,

					vlan_dev->dev_addr))

			skb->pkt_type = PACKET_HOST;

	}



	if (!(vlan_dev_info(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {

		unsigned int offset = skb->data - skb_mac_header(skb);



		/*

		 * vlan_insert_tag expect skb->data pointing to mac header.

		 * So change skb->data before calling it and change back to

		 * original position later

		 */

		skb_push(skb, offset);

		skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);

		if (!skb)

			return false;

		skb_pull(skb, offset + VLAN_HLEN);

		skb_reset_mac_len(skb);

	}



	skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);

	skb->vlan_tci = 0;
@@ -31,22 +56,8 @@ bool vlan_do_receive(struct sk_buff **skbp) 
	u64_stats_update_begin(&rx_stats->syncp);

	rx_stats->rx_packets++;

	rx_stats->rx_bytes += skb->len;



	switch (skb->pkt_type) {

	case PACKET_BROADCAST:

		break;

	case PACKET_MULTICAST:

	if (skb->pkt_type == PACKET_MULTICAST)

		rx_stats->rx_multicast++;

		break;

	case PACKET_OTHERHOST:

		/* Our lower layer thinks this is not local, let's make sure.

		 * This allows the VLAN to have a different MAC than the

		 * underlying device, and still route correctly. */

		if (!compare_ether_addr(eth_hdr(skb)->h_dest,

					vlan_dev->dev_addr))

			skb->pkt_type = PACKET_HOST;

		break;

	}

	u64_stats_update_end(&rx_stats->syncp);



	return true;
@@ -89,18 +100,13 @@ gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, 
}

EXPORT_SYMBOL(vlan_gro_frags);



static struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)

static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)

{

	if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {

	if (skb_cow(skb, skb_headroom(skb)) < 0)

			skb = NULL;

		if (skb) {

			/* Lifted from Gleb's VLAN code... */

			memmove(skb->data - ETH_HLEN,

				skb->data - VLAN_ETH_HLEN, 12);

		return NULL;

	memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);

	skb->mac_header += VLAN_HLEN;

		}

	}

	skb_reset_mac_len(skb);

	return skb;

}
@@ -161,7 +167,7 @@ struct sk_buff *vlan_untag(struct sk_buff *skb) 
	skb_pull_rcsum(skb, VLAN_HLEN);

	vlan_set_encap_proto(skb, vhdr);



	skb = vlan_check_reorder_header(skb);

	skb = vlan_reorder_header(skb);

	if (unlikely(!skb))

		goto err_free;

net/core/dev.c

+1 −1
Original line number Diff line number Diff line
@@ -3114,7 +3114,7 @@ static int __netif_receive_skb(struct sk_buff *skb) 


	skb_reset_network_header(skb);

	skb_reset_transport_header(skb);

	skb->mac_len = skb->network_header - skb->mac_header;

	skb_reset_mac_len(skb);



	pt_prev = NULL;