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net: dsa: tag_8021q: Create helper function for removing VLAN header
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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: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Vladimir Oltean authored and David S. Miller committed Jun 8, 2019
1 parent 5e3f847 commit d461933
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Showing 3 changed files with 53 additions and 39 deletions.
16 changes: 7 additions & 9 deletions include/linux/dsa/8021q.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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);
Expand All @@ -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,
Expand All @@ -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;
Expand All @@ -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 */
57 changes: 37 additions & 20 deletions net/dsa/tag_8021q.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
/* 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
*/
struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb)
{
struct vlan_ethhdr *tag;

if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
return NULL;
u8 *from = skb_mac_header(skb);
u8 *dest = from + VLAN_HLEN;

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.
* 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_pull_rcsum(skb, 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",
Expand Down
19 changes: 9 additions & 10 deletions net/dsa/tag_sja1105.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;

Expand All @@ -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);
Expand All @@ -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;
}
Expand Down

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