diff options
Diffstat (limited to 'net/dsa')
| -rw-r--r-- | net/dsa/dsa_priv.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h index 2da656d984ef..0348dbab4131 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -7,6 +7,7 @@ #ifndef __DSA_PRIV_H #define __DSA_PRIV_H +#include <linux/if_bridge.h> #include <linux/phy.h> #include <linux/netdevice.h> #include <linux/netpoll.h> @@ -194,6 +195,71 @@ dsa_slave_to_master(const struct net_device *dev) return dp->cpu_dp->master; } +/* If under a bridge with vlan_filtering=0, make sure to send pvid-tagged + * frames as untagged, since the bridge will not untag them. + */ +static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb) +{ + struct dsa_port *dp = dsa_slave_to_port(skb->dev); + struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); + struct net_device *br = dp->bridge_dev; + struct net_device *dev = skb->dev; + struct net_device *upper_dev; + struct list_head *iter; + u16 vid, pvid, proto; + int err; + + if (!br || br_vlan_enabled(br)) + return skb; + + err = br_vlan_get_proto(br, &proto); + if (err) + return skb; + + /* Move VLAN tag from data to hwaccel */ + if (!skb_vlan_tag_present(skb) && hdr->h_vlan_proto == htons(proto)) { + skb = skb_vlan_untag(skb); + if (!skb) + return NULL; + } + + if (!skb_vlan_tag_present(skb)) + return skb; + + vid = skb_vlan_tag_get_id(skb); + + /* We already run under an RCU read-side critical section since + * we are called from netif_receive_skb_list_internal(). + */ + err = br_vlan_get_pvid_rcu(dev, &pvid); + if (err) + return skb; + + if (vid != pvid) + return skb; + + /* The sad part about attempting to untag from DSA is that we + * don't know, unless we check, if the skb will end up in + * the bridge's data path - br_allowed_ingress() - or not. + * For example, there might be an 8021q upper for the + * default_pvid of the bridge, which will steal VLAN-tagged traffic + * from the bridge's data path. This is a configuration that DSA + * supports because vlan_filtering is 0. In that case, we should + * definitely keep the tag, to make sure it keeps working. + */ + netdev_for_each_upper_dev_rcu(dev, upper_dev, iter) { + if (!is_vlan_dev(upper_dev)) + continue; + + if (vid == vlan_dev_vlan_id(upper_dev)) + return skb; + } + + __vlan_hwaccel_clear_tag(skb); + + return skb; +} + /* switch.c */ int dsa_switch_register_notifier(struct dsa_switch *ds); void dsa_switch_unregister_notifier(struct dsa_switch *ds); |