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authorVlad Yasevich <vyasevic@redhat.com>2013-02-13 12:00:11 +0000
committerDavid S. Miller <davem@davemloft.net>2013-02-13 19:41:46 -0500
commit85f46c6baef1486ce20e13dd7cdea5dd15be2a90 (patch)
treeaab52d4f01320337bfc59358d26fc856e717a8f2 /net/bridge
parenta37b85c9fbd1dc69fbec3985763f373203eaf9e3 (diff)
downloadop-kernel-dev-85f46c6baef1486ce20e13dd7cdea5dd15be2a90.zip
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bridge: Verify that a vlan is allowed to egress on given port
When bridge forwards a frame, make sure that a frame is allowed to egress on that port. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_forward.c1
-rw-r--r--net/bridge/br_input.c10
-rw-r--r--net/bridge/br_private.h10
-rw-r--r--net/bridge/br_vlan.c20
4 files changed, 41 insertions, 0 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 ed7c764..f0f2461 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -554,6 +554,9 @@ 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);
@@ -598,6 +601,13 @@ 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 8b4bcd8..d8690bf 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -89,6 +89,26 @@ 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;
+
+ br_vlan_get_tag(skb, &vid);
+ 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)
{
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