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Message-Id: <1359601979-14942-4-git-send-email-vyasevic@redhat.com>
Date: Wed, 30 Jan 2013 22:12:50 -0500
From: Vlad Yasevich <vyasevic@...hat.com>
To: shemminger@...tta.com
Cc: bridge@...ts.linux-foundation.org, davem@...emloft.net,
netdev@...r.kernel.org, shmulik.ladkani@...il.com
Subject: [PATCH v7 net-next 03/12] bridge: Verify that a vlan is allowed to egress on give port
When bridge forwards a frame, make sure that a frame is allowed
to egress on that port.
Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
---
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
--
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