When bridge forwards a frame, make sure that a frame is allowed to egress on that port.
Signed-off-by: Vlad Yasevich <[email protected]> --- net/bridge/br_forward.c | 1 + net/bridge/br_input.c | 10 ++++++++++ net/bridge/br_private.h | 16 ++++++++++++++-- net/bridge/br_vlan.c | 20 ++++++++++++++++++++ 4 files changed, 45 insertions(+), 2 deletions(-) diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index 02015a5..35b0671 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -31,6 +31,7 @@ static inline int should_deliver(const struct net_bridge_port *p, const struct sk_buff *skb) { return (((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) && + br_allowed_egress(p->br, nbp_get_vlan_info(p), skb) && p->state == BR_STATE_FORWARDING); } diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 4ef3f6b..787d7da 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -35,6 +35,16 @@ static int br_pass_frame_up(struct sk_buff *skb) brstats->rx_bytes += skb->len; u64_stats_update_end(&brstats->syncp); + /* Bridge is just like any other port. Make sure the + * packet is allowed except in promisc modue when someone + * may be running packet capture. + */ + if (!(brdev->flags & IFF_PROMISC) && + !br_allowed_egress(br, br_get_vlan_info(br), skb)) { + kfree_skb(skb); + return NET_RX_DROP; + } + indev = skb->dev; skb->dev = brdev; diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index be9ba73..f9ee32f 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -553,6 +553,9 @@ static inline void br_mdb_uninit(void) #ifdef CONFIG_BRIDGE_VLAN_FILTERING extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v, struct sk_buff *skb); +extern bool br_allowed_egress(struct net_bridge *br, + const struct net_port_vlans *v, + const struct sk_buff *skb); extern int br_vlan_add(struct net_bridge *br, u16 vid); extern int br_vlan_delete(struct net_bridge *br, u16 vid); extern void br_vlan_flush(struct net_bridge *br); @@ -561,12 +564,14 @@ extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid); extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); extern void nbp_vlan_flush(struct net_bridge_port *port); -static inline struct net_port_vlans *br_get_vlan_info(struct net_bridge *br) +static inline struct net_port_vlans *br_get_vlan_info( + const struct net_bridge *br) { return rcu_dereference(br->vlan_info); } -static inline struct net_port_vlans *nbp_get_vlan_info(struct net_bridge_port *p) +static inline struct net_port_vlans *nbp_get_vlan_info( + const struct net_bridge_port *p) { return rcu_dereference(p->vlan_info); } @@ -590,6 +595,13 @@ static inline bool br_allowed_ingress(struct net_bridge *br, return true; } +static inline bool br_allowed_egress(struct net_bridge *br, + const struct net_port_vlans *v, + const struct sk_buff *skb) +{ + return true; +} + static inline int br_vlan_add(struct net_bridge *br, u16 vid) { return -EOPNOTSUPP; diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index 815678b..912bc75 100644 --- a/net/bridge/br_vlan.c +++ b/net/bridge/br_vlan.c @@ -124,6 +124,26 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v, return false; } +/* Called under RCU. */ +bool br_allowed_egress(struct net_bridge *br, + const struct net_port_vlans *v, + const struct sk_buff *skb) +{ + u16 vid; + + if (!br->vlan_enabled) + return true; + + if (!v) + return false; + + vid = br_vlan_get_tag(skb); + if (test_bit(vid, v->vlan_bitmap)) + return true; + + return false; +} + /* Must be protected by RTNL */ int br_vlan_add(struct net_bridge *br, u16 vid) { -- 1.7.7.6
