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authorPedro Garcia <pedro.netdev@dondevamos.com>2010-07-18 15:38:44 -0700
committerDavid S. Miller <davem@davemloft.net>2010-07-18 15:38:44 -0700
commitad1afb00393915a51c21b1ae8704562bf036855f (patch)
tree68ead91b78624a66f4aabb9699f4b414b914a762 /net/8021q
parent01893c82b4e6949f4e3a453c4faea34970359d76 (diff)
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vlan_dev: VLAN 0 should be treated as "no vlan tag" (802.1p packet)
- Without the 8021q module loaded in the kernel, all 802.1p packets (VLAN 0 but QoS tagging) are silently discarded (as expected, as the protocol is not loaded). - Without this patch in 8021q module, these packets are forwarded to the module, but they are discarded also if VLAN 0 is not configured, which should not be the default behaviour, as VLAN 0 is not really a VLANed packet but a 802.1p packet. Defining VLAN 0 makes it almost impossible to communicate with mixed 802.1p and non 802.1p devices on the same network due to arp table issues. - Changed logic to skip vlan specific code in vlan_skb_recv if VLAN is 0 and we have not defined a VLAN with ID 0, but we accept the packet with the encapsulated proto and pass it later to netif_rx. - In the vlan device event handler, added some logic to add VLAN 0 to HW filter in devices that support it (this prevented any traffic in VLAN 0 to reach the stack in e1000e with HW filter under 2.6.35, and probably also with other HW filtered cards, so we fix it here). - In the vlan unregister logic, prevent the elimination of VLAN 0 in devices with HW filter. - The default behaviour is to ignore the VLAN 0 tagging and accept the packet as if it was not tagged, but we can still define a VLAN 0 if desired (so it is backwards compatible). Signed-off-by: Pedro Garcia <pedro.netdev@dondevamos.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/8021q')
-rw-r--r--net/8021q/vlan.c13
-rw-r--r--net/8021q/vlan_core.c19
-rw-r--r--net/8021q/vlan_dev.c103
3 files changed, 86 insertions, 49 deletions
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 3c1c8c14e929..a2ad15250575 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -155,9 +155,10 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
BUG_ON(!grp);
/* Take it out of our own structures, but be sure to interlock with
- * HW accelerating devices or SW vlan input packet processing.
+ * HW accelerating devices or SW vlan input packet processing if
+ * VLAN is not 0 (leave it there for 802.1p).
*/
- if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
+ if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
grp->nr_vlans--;
@@ -419,6 +420,14 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
if (is_vlan_dev(dev))
__vlan_device_event(dev, event);
+ if ((event == NETDEV_UP) &&
+ (dev->features & NETIF_F_HW_VLAN_FILTER) &&
+ dev->netdev_ops->ndo_vlan_rx_add_vid) {
+ pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
+ dev->name);
+ dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
+ }
+
grp = __vlan_find_group(dev);
if (!grp)
goto out;
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 1b9406a31f0c..01ddb0472f86 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -8,6 +8,9 @@
int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
u16 vlan_tci, int polling)
{
+ struct net_device *vlan_dev;
+ u16 vlan_id;
+
if (netpoll_rx(skb))
return NET_RX_DROP;
@@ -16,9 +19,12 @@ int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
skb->skb_iif = skb->dev->ifindex;
__vlan_hwaccel_put_tag(skb, vlan_tci);
- skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
+ vlan_id = vlan_tci & VLAN_VID_MASK;
+ vlan_dev = vlan_group_get_device(grp, vlan_id);
- if (!skb->dev)
+ if (vlan_dev)
+ skb->dev = vlan_dev;
+ else if (vlan_id)
goto drop;
return (polling ? netif_receive_skb(skb) : netif_rx(skb));
@@ -83,15 +89,20 @@ vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
unsigned int vlan_tci, struct sk_buff *skb)
{
struct sk_buff *p;
+ struct net_device *vlan_dev;
+ u16 vlan_id;
if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
skb->deliver_no_wcard = 1;
skb->skb_iif = skb->dev->ifindex;
__vlan_hwaccel_put_tag(skb, vlan_tci);
- skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
+ vlan_id = vlan_tci & VLAN_VID_MASK;
+ vlan_dev = vlan_group_get_device(grp, vlan_id);
- if (!skb->dev)
+ if (vlan_dev)
+ skb->dev = vlan_dev;
+ else if (vlan_id)
goto drop;
for (p = napi->gro_list; p; p = p->next) {
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 7cb285f96b99..3d59c9bf8feb 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -142,6 +142,7 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
{
struct vlan_hdr *vhdr;
struct vlan_rx_stats *rx_stats;
+ struct net_device *vlan_dev;
u16 vlan_id;
u16 vlan_tci;
@@ -157,55 +158,71 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
vlan_id = vlan_tci & VLAN_VID_MASK;
rcu_read_lock();
- skb->dev = __find_vlan_dev(dev, vlan_id);
- if (!skb->dev) {
- pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
- __func__, vlan_id, dev->name);
- goto err_unlock;
- }
-
- rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
- smp_processor_id());
- u64_stats_update_begin(&rx_stats->syncp);
- rx_stats->rx_packets++;
- rx_stats->rx_bytes += skb->len;
-
- skb_pull_rcsum(skb, VLAN_HLEN);
-
- skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
+ vlan_dev = __find_vlan_dev(dev, vlan_id);
- pr_debug("%s: priority: %u for TCI: %hu\n",
- __func__, skb->priority, vlan_tci);
-
- switch (skb->pkt_type) {
- case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
- /* stats->broadcast ++; // no such counter :-( */
- break;
-
- case PACKET_MULTICAST:
- rx_stats->rx_multicast++;
- break;
+ /* If the VLAN device is defined, we use it.
+ * If not, and the VID is 0, it is a 802.1p packet (not
+ * really a VLAN), so we will just netif_rx it later to the
+ * original interface, but with the skb->proto set to the
+ * wrapped proto: we do nothing here.
+ */
- case PACKET_OTHERHOST:
- /* Our lower layer thinks this is not local, let's make sure.
- * This allows the VLAN to have a different MAC than the
- * underlying device, and still route correctly.
- */
- if (!compare_ether_addr(eth_hdr(skb)->h_dest,
- skb->dev->dev_addr))
- skb->pkt_type = PACKET_HOST;
- break;
- default:
- break;
+ if (!vlan_dev) {
+ if (vlan_id) {
+ pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
+ __func__, vlan_id, dev->name);
+ goto err_unlock;
+ }
+ rx_stats = NULL;
+ } else {
+ skb->dev = vlan_dev;
+
+ rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
+ smp_processor_id());
+ u64_stats_update_begin(&rx_stats->syncp);
+ rx_stats->rx_packets++;
+ rx_stats->rx_bytes += skb->len;
+
+ skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
+
+ pr_debug("%s: priority: %u for TCI: %hu\n",
+ __func__, skb->priority, vlan_tci);
+
+ switch (skb->pkt_type) {
+ case PACKET_BROADCAST:
+ /* Yeah, stats collect these together.. */
+ /* stats->broadcast ++; // no such counter :-( */
+ break;
+
+ case PACKET_MULTICAST:
+ rx_stats->rx_multicast++;
+ break;
+
+ case PACKET_OTHERHOST:
+ /* Our lower layer thinks this is not local, let's make
+ * sure.
+ * This allows the VLAN to have a different MAC than the
+ * underlying device, and still route correctly.
+ */
+ if (!compare_ether_addr(eth_hdr(skb)->h_dest,
+ skb->dev->dev_addr))
+ skb->pkt_type = PACKET_HOST;
+ break;
+ default:
+ break;
+ }
+ u64_stats_update_end(&rx_stats->syncp);
}
- u64_stats_update_end(&rx_stats->syncp);
+ skb_pull_rcsum(skb, VLAN_HLEN);
vlan_set_encap_proto(skb, vhdr);
- skb = vlan_check_reorder_header(skb);
- if (!skb) {
- rx_stats->rx_errors++;
- goto err_unlock;
+ if (vlan_dev) {
+ skb = vlan_check_reorder_header(skb);
+ if (!skb) {
+ rx_stats->rx_errors++;
+ goto err_unlock;
+ }
}
netif_rx(skb);