aboutsummaryrefslogtreecommitdiffstats
path: root/net/bridge
diff options
context:
space:
mode:
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_device.c3
-rw-r--r--net/bridge/br_forward.c8
-rw-r--r--net/bridge/br_input.c7
-rw-r--r--net/bridge/br_private.h34
-rw-r--r--net/bridge/br_vlan.c83
5 files changed, 125 insertions, 10 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 091bedf..9509139 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -30,6 +30,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
struct net_bridge_fdb_entry *dst;
struct net_bridge_mdb_entry *mdst;
struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
+ u16 vid = 0;
rcu_read_lock();
#ifdef CONFIG_BRIDGE_NETFILTER
@@ -45,7 +46,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
brstats->tx_bytes += skb->len;
u64_stats_update_end(&brstats->syncp);
- if (!br_allowed_ingress(br, br_get_vlan_info(br), skb))
+ if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid))
goto out;
BR_INPUT_SKB_CB(skb)->brdev = dev;
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 35b0671..092b20e 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -64,6 +64,10 @@ int br_forward_finish(struct sk_buff *skb)
static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
+ skb = br_handle_vlan(to->br, nbp_get_vlan_info(to), skb);
+ if (!skb)
+ return;
+
skb->dev = to->dev;
if (unlikely(netpoll_tx_running(to->br->dev))) {
@@ -89,6 +93,10 @@ static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
return;
}
+ skb = br_handle_vlan(to->br, nbp_get_vlan_info(to), skb);
+ if (!skb)
+ return;
+
indev = skb->dev;
skb->dev = to->dev;
skb_forward_csum(skb);
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 787d7da..a63f227 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -45,6 +45,10 @@ static int br_pass_frame_up(struct sk_buff *skb)
return NET_RX_DROP;
}
+ skb = br_handle_vlan(br, br_get_vlan_info(br), skb);
+ if (!skb)
+ return NET_RX_DROP;
+
indev = skb->dev;
skb->dev = brdev;
@@ -61,11 +65,12 @@ int br_handle_frame_finish(struct sk_buff *skb)
struct net_bridge_fdb_entry *dst;
struct net_bridge_mdb_entry *mdst;
struct sk_buff *skb2;
+ u16 vid = 0;
if (!p || p->state == BR_STATE_DISABLED)
goto drop;
- if (!br_allowed_ingress(p->br, nbp_get_vlan_info(p), skb))
+ if (!br_allowed_ingress(p->br, nbp_get_vlan_info(p), skb, &vid))
goto drop;
/* insert into forwarding database after filtering to avoid spoofing */
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index ce22352..ea8e7ef 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -67,6 +67,7 @@ struct br_ip
struct net_port_vlans {
u16 port_idx;
+ u16 pvid;
union {
struct net_bridge_port *port;
struct net_bridge *br;
@@ -554,10 +555,13 @@ static inline void br_mdb_uninit(void)
/* br_vlan.c */
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
- struct sk_buff *skb);
+ struct sk_buff *skb, u16 *vid);
extern bool br_allowed_egress(struct net_bridge *br,
const struct net_port_vlans *v,
const struct sk_buff *skb);
+extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
+ const struct net_port_vlans *v,
+ 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);
@@ -594,10 +598,23 @@ static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
return err;
}
+
+static inline u16 br_get_pvid(const struct net_port_vlans *v)
+{
+ /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
+ * vid wasn't set
+ */
+ smp_rmb();
+ return (v->pvid & VLAN_TAG_PRESENT) ?
+ (v->pvid & ~VLAN_TAG_PRESENT) :
+ VLAN_N_VID;
+}
+
#else
static inline bool br_allowed_ingress(struct net_bridge *br,
struct net_port_vlans *v,
- struct sk_buff *skb)
+ struct sk_buff *skb,
+ u16 *vid)
{
return true;
}
@@ -609,6 +626,13 @@ static inline bool br_allowed_egress(struct net_bridge *br,
return true;
}
+static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
+ const struct net_port_vlans *v,
+ struct sk_buff *skb)
+{
+ return skb;
+}
+
static inline int br_vlan_add(struct net_bridge *br, u16 vid)
{
return -EOPNOTSUPP;
@@ -648,10 +672,14 @@ static inline struct net_port_vlans *nbp_get_vlan_info(
return NULL;
}
-static inline u16 br_vlan_get_tag(const struct sk_buff *skb)
+static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
{
return 0;
}
+static inline u16 br_get_pvid(const struct net_port_vlans *v)
+{
+ return VLAN_N_VID; /* Returns invalid vid */
+}
#endif
/* br_netfilter.c */
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index f2bf5a1..20057de 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -66,12 +66,68 @@ static void __vlan_flush(struct net_port_vlans *v)
kfree_rcu(v, rcu);
}
-/* Called under RCU */
-bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
- struct sk_buff *skb)
+/* Strip the tag from the packet. Will return skb with tci set 0. */
+static struct sk_buff *br_vlan_untag(struct sk_buff *skb)
+{
+ if (skb->protocol != htons(ETH_P_8021Q)) {
+ skb->vlan_tci = 0;
+ return skb;
+ }
+
+ skb->vlan_tci = 0;
+ skb = vlan_untag(skb);
+ if (skb)
+ skb->vlan_tci = 0;
+
+ return skb;
+}
+
+struct sk_buff *br_handle_vlan(struct net_bridge *br,
+ const struct net_port_vlans *pv,
+ struct sk_buff *skb)
{
u16 vid;
+ if (!br->vlan_enabled)
+ goto out;
+
+ /* At this point, we know that the frame was filtered and contains
+ * a valid vlan id. If the vlan id matches the pvid of current port
+ * send untagged; otherwise, send taged.
+ */
+ br_vlan_get_tag(skb, &vid);
+ if (vid == br_get_pvid(pv))
+ skb = br_vlan_untag(skb);
+ else {
+ /* Egress policy says "send tagged". If output device
+ * is the bridge, we need to add the VLAN header
+ * ourselves since we'll be going through the RX path.
+ * Sending to ports puts the frame on the TX path and
+ * we let dev_hard_start_xmit() add the header.
+ */
+ if (skb->protocol != htons(ETH_P_8021Q) &&
+ pv->port_idx == 0) {
+ /* vlan_put_tag expects skb->data to point to
+ * mac header.
+ */
+ skb_push(skb, ETH_HLEN);
+ skb = __vlan_put_tag(skb, skb->vlan_tci);
+ if (!skb)
+ goto out;
+ /* put skb->data back to where it was */
+ skb_pull(skb, ETH_HLEN);
+ skb->vlan_tci = 0;
+ }
+ }
+
+out:
+ return skb;
+}
+
+/* Called under RCU */
+bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
+ struct sk_buff *skb, u16 *vid)
+{
/* If VLAN filtering is disabled on the bridge, all packets are
* permitted.
*/
@@ -84,8 +140,25 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
if (!v)
return false;
- br_vlan_get_tag(skb, &vid);
- if (test_bit(vid, v->vlan_bitmap))
+ if (br_vlan_get_tag(skb, vid)) {
+ u16 pvid = br_get_pvid(v);
+
+ /* Frame did not have a tag. See if pvid is set
+ * on this port. That tells us which vlan untagged
+ * traffic belongs to.
+ */
+ if (pvid == VLAN_N_VID)
+ return false;
+
+ /* PVID is set on this port. Any untagged ingress
+ * frame is considered to belong to this vlan.
+ */
+ __vlan_hwaccel_put_tag(skb, pvid);
+ return true;
+ }
+
+ /* Frame had a valid vlan tag. See if vlan is allowed */
+ if (test_bit(*vid, v->vlan_bitmap))
return true;
return false;
generated by cgit v1.1 at 2024-12-26 17:58:04 +0000