![Vlad Yasevich](/assets/img/avatar_default.png)
Currently when vlan filtering is turned on on the bridge, the bridge will drop all traffic untill the user configures the filter. This isn't very nice for ports that don't care about vlans and just want untagged traffic. A concept of a default_pvid was recently introduced. This patch adds filtering support for default_pvid. Now, ports that don't care about vlans and don't define there own filter will belong to the VLAN of the default_pvid and continue to receive untagged traffic. This filtering can be disabled by setting default_pvid to 0. Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
737 lines
15 KiB
C
737 lines
15 KiB
C
#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include "br_private.h"
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static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
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{
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if (v->pvid == vid)
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return;
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smp_wmb();
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v->pvid = vid;
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}
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static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
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{
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if (v->pvid != vid)
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return;
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smp_wmb();
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v->pvid = 0;
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}
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static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
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{
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if (flags & BRIDGE_VLAN_INFO_PVID)
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__vlan_add_pvid(v, vid);
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else
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__vlan_delete_pvid(v, vid);
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if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
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set_bit(vid, v->untagged_bitmap);
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else
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clear_bit(vid, v->untagged_bitmap);
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}
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static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
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{
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struct net_bridge_port *p = NULL;
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struct net_bridge *br;
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struct net_device *dev;
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int err;
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if (test_bit(vid, v->vlan_bitmap)) {
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__vlan_add_flags(v, vid, flags);
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return 0;
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}
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if (v->port_idx) {
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p = v->parent.port;
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br = p->br;
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dev = p->dev;
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} else {
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br = v->parent.br;
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dev = br->dev;
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}
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if (p) {
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/* Add VLAN to the device filter if it is supported.
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* This ensures tagged traffic enters the bridge when
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* promiscuous mode is disabled by br_manage_promisc().
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*/
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err = vlan_vid_add(dev, br->vlan_proto, vid);
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if (err)
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return err;
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}
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err = br_fdb_insert(br, p, dev->dev_addr, vid);
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if (err) {
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br_err(br, "failed insert local address into bridge "
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"forwarding table\n");
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goto out_filt;
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}
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set_bit(vid, v->vlan_bitmap);
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v->num_vlans++;
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__vlan_add_flags(v, vid, flags);
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return 0;
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out_filt:
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if (p)
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vlan_vid_del(dev, br->vlan_proto, vid);
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return err;
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}
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static int __vlan_del(struct net_port_vlans *v, u16 vid)
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{
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if (!test_bit(vid, v->vlan_bitmap))
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return -EINVAL;
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__vlan_delete_pvid(v, vid);
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clear_bit(vid, v->untagged_bitmap);
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if (v->port_idx) {
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struct net_bridge_port *p = v->parent.port;
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vlan_vid_del(p->dev, p->br->vlan_proto, vid);
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}
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clear_bit(vid, v->vlan_bitmap);
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v->num_vlans--;
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if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
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if (v->port_idx)
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RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
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else
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RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
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kfree_rcu(v, rcu);
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}
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return 0;
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}
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static void __vlan_flush(struct net_port_vlans *v)
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{
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smp_wmb();
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v->pvid = 0;
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bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
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if (v->port_idx)
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RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
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else
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RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
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kfree_rcu(v, rcu);
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}
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struct sk_buff *br_handle_vlan(struct net_bridge *br,
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const struct net_port_vlans *pv,
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struct sk_buff *skb)
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{
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u16 vid;
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/* If this packet was not filtered at input, let it pass */
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if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
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goto out;
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/* Vlan filter table must be configured at this point. The
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* only exception is the bridge is set in promisc mode and the
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* packet is destined for the bridge device. In this case
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* pass the packet as is.
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*/
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if (!pv) {
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if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
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goto out;
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} else {
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kfree_skb(skb);
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return NULL;
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}
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}
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/* At this point, we know that the frame was filtered and contains
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* a valid vlan id. If the vlan id is set in the untagged bitmap,
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* send untagged; otherwise, send tagged.
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*/
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br_vlan_get_tag(skb, &vid);
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if (test_bit(vid, pv->untagged_bitmap))
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skb->vlan_tci = 0;
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out:
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return skb;
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}
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/* Called under RCU */
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bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
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struct sk_buff *skb, u16 *vid)
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{
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bool tagged;
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__be16 proto;
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/* If VLAN filtering is disabled on the bridge, all packets are
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* permitted.
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*/
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if (!br->vlan_enabled) {
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BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
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return true;
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}
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/* If there are no vlan in the permitted list, all packets are
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* rejected.
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*/
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if (!v)
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goto drop;
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BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
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proto = br->vlan_proto;
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/* If vlan tx offload is disabled on bridge device and frame was
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* sent from vlan device on the bridge device, it does not have
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* HW accelerated vlan tag.
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*/
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if (unlikely(!vlan_tx_tag_present(skb) &&
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skb->protocol == proto)) {
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skb = skb_vlan_untag(skb);
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if (unlikely(!skb))
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return false;
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}
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if (!br_vlan_get_tag(skb, vid)) {
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/* Tagged frame */
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if (skb->vlan_proto != proto) {
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/* Protocol-mismatch, empty out vlan_tci for new tag */
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skb_push(skb, ETH_HLEN);
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skb = __vlan_put_tag(skb, skb->vlan_proto,
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vlan_tx_tag_get(skb));
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if (unlikely(!skb))
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return false;
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skb_pull(skb, ETH_HLEN);
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skb_reset_mac_len(skb);
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*vid = 0;
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tagged = false;
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} else {
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tagged = true;
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}
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} else {
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/* Untagged frame */
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tagged = false;
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}
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if (!*vid) {
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u16 pvid = br_get_pvid(v);
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/* Frame had a tag with VID 0 or did not have a tag.
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* See if pvid is set on this port. That tells us which
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* vlan untagged or priority-tagged traffic belongs to.
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*/
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if (!pvid)
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goto drop;
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/* PVID is set on this port. Any untagged or priority-tagged
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* ingress frame is considered to belong to this vlan.
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*/
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*vid = pvid;
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if (likely(!tagged))
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/* Untagged Frame. */
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__vlan_hwaccel_put_tag(skb, proto, pvid);
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else
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/* Priority-tagged Frame.
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* At this point, We know that skb->vlan_tci had
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* VLAN_TAG_PRESENT bit and its VID field was 0x000.
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* We update only VID field and preserve PCP field.
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*/
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skb->vlan_tci |= pvid;
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return true;
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}
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/* Frame had a valid vlan tag. See if vlan is allowed */
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if (test_bit(*vid, v->vlan_bitmap))
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return true;
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drop:
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kfree_skb(skb);
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return false;
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}
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/* Called under RCU. */
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bool br_allowed_egress(struct net_bridge *br,
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const struct net_port_vlans *v,
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const struct sk_buff *skb)
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{
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u16 vid;
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/* If this packet was not filtered at input, let it pass */
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if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
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return true;
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if (!v)
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return false;
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br_vlan_get_tag(skb, &vid);
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if (test_bit(vid, v->vlan_bitmap))
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return true;
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return false;
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}
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/* Called under RCU */
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bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
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{
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struct net_bridge *br = p->br;
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struct net_port_vlans *v;
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/* If filtering was disabled at input, let it pass. */
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if (!br->vlan_enabled)
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return true;
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v = rcu_dereference(p->vlan_info);
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if (!v)
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return false;
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if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
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*vid = 0;
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if (!*vid) {
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*vid = br_get_pvid(v);
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if (!*vid)
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return false;
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return true;
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}
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if (test_bit(*vid, v->vlan_bitmap))
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return true;
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return false;
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}
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/* Must be protected by RTNL.
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* Must be called with vid in range from 1 to 4094 inclusive.
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*/
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int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
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{
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struct net_port_vlans *pv = NULL;
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int err;
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ASSERT_RTNL();
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pv = rtnl_dereference(br->vlan_info);
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if (pv)
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return __vlan_add(pv, vid, flags);
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/* Create port vlan infomration
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*/
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pv = kzalloc(sizeof(*pv), GFP_KERNEL);
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if (!pv)
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return -ENOMEM;
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pv->parent.br = br;
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err = __vlan_add(pv, vid, flags);
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if (err)
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goto out;
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rcu_assign_pointer(br->vlan_info, pv);
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return 0;
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out:
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kfree(pv);
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return err;
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}
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/* Must be protected by RTNL.
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* Must be called with vid in range from 1 to 4094 inclusive.
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*/
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int br_vlan_delete(struct net_bridge *br, u16 vid)
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{
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struct net_port_vlans *pv;
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ASSERT_RTNL();
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pv = rtnl_dereference(br->vlan_info);
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if (!pv)
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return -EINVAL;
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br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
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__vlan_del(pv, vid);
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return 0;
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}
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void br_vlan_flush(struct net_bridge *br)
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{
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struct net_port_vlans *pv;
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ASSERT_RTNL();
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pv = rtnl_dereference(br->vlan_info);
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if (!pv)
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return;
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__vlan_flush(pv);
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}
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bool br_vlan_find(struct net_bridge *br, u16 vid)
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{
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struct net_port_vlans *pv;
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bool found = false;
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rcu_read_lock();
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pv = rcu_dereference(br->vlan_info);
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if (!pv)
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goto out;
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if (test_bit(vid, pv->vlan_bitmap))
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found = true;
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out:
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rcu_read_unlock();
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return found;
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}
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/* Must be protected by RTNL. */
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static void recalculate_group_addr(struct net_bridge *br)
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{
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if (br->group_addr_set)
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return;
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spin_lock_bh(&br->lock);
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if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
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/* Bridge Group Address */
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br->group_addr[5] = 0x00;
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} else { /* vlan_enabled && ETH_P_8021AD */
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/* Provider Bridge Group Address */
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br->group_addr[5] = 0x08;
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}
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spin_unlock_bh(&br->lock);
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}
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/* Must be protected by RTNL. */
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void br_recalculate_fwd_mask(struct net_bridge *br)
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{
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if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
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br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
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else /* vlan_enabled && ETH_P_8021AD */
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br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
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~(1u << br->group_addr[5]);
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}
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int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
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{
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if (!rtnl_trylock())
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return restart_syscall();
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if (br->vlan_enabled == val)
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goto unlock;
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br->vlan_enabled = val;
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br_manage_promisc(br);
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recalculate_group_addr(br);
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br_recalculate_fwd_mask(br);
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unlock:
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rtnl_unlock();
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return 0;
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}
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int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
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{
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int err = 0;
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struct net_bridge_port *p;
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struct net_port_vlans *pv;
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__be16 proto, oldproto;
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u16 vid, errvid;
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if (val != ETH_P_8021Q && val != ETH_P_8021AD)
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return -EPROTONOSUPPORT;
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if (!rtnl_trylock())
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return restart_syscall();
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proto = htons(val);
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if (br->vlan_proto == proto)
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goto unlock;
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/* Add VLANs for the new proto to the device filter. */
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list_for_each_entry(p, &br->port_list, list) {
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pv = rtnl_dereference(p->vlan_info);
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if (!pv)
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continue;
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for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
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err = vlan_vid_add(p->dev, proto, vid);
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if (err)
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goto err_filt;
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}
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}
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oldproto = br->vlan_proto;
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br->vlan_proto = proto;
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recalculate_group_addr(br);
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br_recalculate_fwd_mask(br);
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/* Delete VLANs for the old proto from the device filter. */
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list_for_each_entry(p, &br->port_list, list) {
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pv = rtnl_dereference(p->vlan_info);
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if (!pv)
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continue;
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for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
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vlan_vid_del(p->dev, oldproto, vid);
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}
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unlock:
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rtnl_unlock();
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return err;
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err_filt:
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errvid = vid;
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for_each_set_bit(vid, pv->vlan_bitmap, errvid)
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vlan_vid_del(p->dev, proto, vid);
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list_for_each_entry_continue_reverse(p, &br->port_list, list) {
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pv = rtnl_dereference(p->vlan_info);
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if (!pv)
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continue;
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for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
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vlan_vid_del(p->dev, proto, vid);
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}
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goto unlock;
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}
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static bool vlan_default_pvid(struct net_port_vlans *pv, u16 vid)
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{
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return pv && vid == pv->pvid && test_bit(vid, pv->untagged_bitmap);
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}
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static void br_vlan_disable_default_pvid(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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u16 pvid = br->default_pvid;
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/* Disable default_pvid on all ports where it is still
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* configured.
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*/
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if (vlan_default_pvid(br_get_vlan_info(br), pvid))
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br_vlan_delete(br, pvid);
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list_for_each_entry(p, &br->port_list, list) {
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if (vlan_default_pvid(nbp_get_vlan_info(p), pvid))
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nbp_vlan_delete(p, pvid);
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}
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br->default_pvid = 0;
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}
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static int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
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{
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struct net_bridge_port *p;
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u16 old_pvid;
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int err = 0;
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unsigned long *changed;
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changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
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GFP_KERNEL);
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if (!changed)
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return -ENOMEM;
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old_pvid = br->default_pvid;
|
|
|
|
/* Update default_pvid config only if we do not conflict with
|
|
* user configuration.
|
|
*/
|
|
if ((!old_pvid || vlan_default_pvid(br_get_vlan_info(br), old_pvid)) &&
|
|
!br_vlan_find(br, pvid)) {
|
|
err = br_vlan_add(br, pvid,
|
|
BRIDGE_VLAN_INFO_PVID |
|
|
BRIDGE_VLAN_INFO_UNTAGGED);
|
|
if (err)
|
|
goto out;
|
|
br_vlan_delete(br, old_pvid);
|
|
set_bit(0, changed);
|
|
}
|
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
|
/* Update default_pvid config only if we do not conflict with
|
|
* user configuration.
|
|
*/
|
|
if ((old_pvid &&
|
|
!vlan_default_pvid(nbp_get_vlan_info(p), old_pvid)) ||
|
|
nbp_vlan_find(p, pvid))
|
|
continue;
|
|
|
|
err = nbp_vlan_add(p, pvid,
|
|
BRIDGE_VLAN_INFO_PVID |
|
|
BRIDGE_VLAN_INFO_UNTAGGED);
|
|
if (err)
|
|
goto err_port;
|
|
nbp_vlan_delete(p, old_pvid);
|
|
set_bit(p->port_no, changed);
|
|
}
|
|
|
|
br->default_pvid = pvid;
|
|
|
|
out:
|
|
kfree(changed);
|
|
return err;
|
|
|
|
err_port:
|
|
list_for_each_entry_continue_reverse(p, &br->port_list, list) {
|
|
if (!test_bit(p->port_no, changed))
|
|
continue;
|
|
|
|
if (old_pvid)
|
|
nbp_vlan_add(p, old_pvid,
|
|
BRIDGE_VLAN_INFO_PVID |
|
|
BRIDGE_VLAN_INFO_UNTAGGED);
|
|
nbp_vlan_delete(p, pvid);
|
|
}
|
|
|
|
if (test_bit(0, changed)) {
|
|
if (old_pvid)
|
|
br_vlan_add(br, old_pvid,
|
|
BRIDGE_VLAN_INFO_PVID |
|
|
BRIDGE_VLAN_INFO_UNTAGGED);
|
|
br_vlan_delete(br, pvid);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
|
|
{
|
|
u16 pvid = val;
|
|
int err = 0;
|
|
|
|
if (val >= VLAN_VID_MASK)
|
|
return -EINVAL;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
if (pvid == br->default_pvid)
|
|
goto unlock;
|
|
|
|
/* Only allow default pvid change when filtering is disabled */
|
|
if (br->vlan_enabled) {
|
|
pr_info_once("Please disable vlan filtering to change default_pvid\n");
|
|
err = -EPERM;
|
|
goto unlock;
|
|
}
|
|
|
|
if (!pvid)
|
|
br_vlan_disable_default_pvid(br);
|
|
else
|
|
err = __br_vlan_set_default_pvid(br, pvid);
|
|
|
|
unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
int br_vlan_init(struct net_bridge *br)
|
|
{
|
|
br->vlan_proto = htons(ETH_P_8021Q);
|
|
br->default_pvid = 1;
|
|
return br_vlan_add(br, 1,
|
|
BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED);
|
|
}
|
|
|
|
/* Must be protected by RTNL.
|
|
* Must be called with vid in range from 1 to 4094 inclusive.
|
|
*/
|
|
int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
|
|
{
|
|
struct net_port_vlans *pv = NULL;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
pv = rtnl_dereference(port->vlan_info);
|
|
if (pv)
|
|
return __vlan_add(pv, vid, flags);
|
|
|
|
/* Create port vlan infomration
|
|
*/
|
|
pv = kzalloc(sizeof(*pv), GFP_KERNEL);
|
|
if (!pv) {
|
|
err = -ENOMEM;
|
|
goto clean_up;
|
|
}
|
|
|
|
pv->port_idx = port->port_no;
|
|
pv->parent.port = port;
|
|
err = __vlan_add(pv, vid, flags);
|
|
if (err)
|
|
goto clean_up;
|
|
|
|
rcu_assign_pointer(port->vlan_info, pv);
|
|
return 0;
|
|
|
|
clean_up:
|
|
kfree(pv);
|
|
return err;
|
|
}
|
|
|
|
/* Must be protected by RTNL.
|
|
* Must be called with vid in range from 1 to 4094 inclusive.
|
|
*/
|
|
int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
|
|
{
|
|
struct net_port_vlans *pv;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
pv = rtnl_dereference(port->vlan_info);
|
|
if (!pv)
|
|
return -EINVAL;
|
|
|
|
br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
|
|
|
|
return __vlan_del(pv, vid);
|
|
}
|
|
|
|
void nbp_vlan_flush(struct net_bridge_port *port)
|
|
{
|
|
struct net_port_vlans *pv;
|
|
u16 vid;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
pv = rtnl_dereference(port->vlan_info);
|
|
if (!pv)
|
|
return;
|
|
|
|
for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
|
|
vlan_vid_del(port->dev, port->br->vlan_proto, vid);
|
|
|
|
__vlan_flush(pv);
|
|
}
|
|
|
|
bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
|
|
{
|
|
struct net_port_vlans *pv;
|
|
bool found = false;
|
|
|
|
rcu_read_lock();
|
|
pv = rcu_dereference(port->vlan_info);
|
|
|
|
if (!pv)
|
|
goto out;
|
|
|
|
if (test_bit(vid, pv->vlan_bitmap))
|
|
found = true;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return found;
|
|
}
|
|
|
|
int nbp_vlan_init(struct net_bridge_port *p)
|
|
{
|
|
return p->br->default_pvid ?
|
|
nbp_vlan_add(p, p->br->default_pvid,
|
|
BRIDGE_VLAN_INFO_PVID |
|
|
BRIDGE_VLAN_INFO_UNTAGGED) :
|
|
0;
|
|
}
|