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: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/dsa/8021q.h b/include/linux/dsa/8021q.h
index 3911e058647889d029d58a9e0d0101661ac529c3..0aa803c451a3995da0ce889c109c0801c2150c14 100644 (file)
--- a/include/linux/dsa/8021q.h
+++ b/include/linux/dsa/8021q.h
@@ -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 */

diff --git a/net/dsa/tag_8021q.c b/net/dsa/tag_8021q.c
index 65a35e976d7b67c5f5b97f74f1199f35a10e56f7..6ebbd799c4eb61648f2466dc3d7498c7b1b954a4 100644 (file)
--- a/net/dsa/tag_8021q.c
+++ b/net/dsa/tag_8021q.c
@@ -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",

diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c
index d43737e6c3fb714237a0af380cc68c7a3154aa3d..77eeea004e926d21f721228844ae492179bf332a 100644 (file)
--- a/net/dsa/tag_sja1105.c
+++ b/net/dsa/tag_sja1105.c
@@ -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;
 }