mirror of https://gitee.com/openkylin/linux.git
420 lines
8.4 KiB
C
420 lines
8.4 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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if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
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set_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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const struct net_device_ops *ops;
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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 (vid) {
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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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ops = dev->netdev_ops;
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if (p && (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
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/* Add VLAN to the device filter if it is supported.
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* Stricly speaking, this is not necessary now, since
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* devices are made promiscuous by the bridge, but if
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* that ever changes this code will allow tagged
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* traffic to enter the bridge.
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*/
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err = ops->ndo_vlan_rx_add_vid(dev, htons(ETH_P_8021Q),
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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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}
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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 && (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
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ops->ndo_vlan_rx_kill_vid(dev, htons(ETH_P_8021Q), 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 && vid) {
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struct net_device *dev = v->parent.port->dev;
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const struct net_device_ops *ops = dev->netdev_ops;
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if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
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ops->ndo_vlan_rx_kill_vid(dev, htons(ETH_P_8021Q), 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_assign_pointer(v->parent.port->vlan_info, NULL);
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else
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rcu_assign_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_assign_pointer(v->parent.port->vlan_info, NULL);
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else
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rcu_assign_pointer(v->parent.br->vlan_info, NULL);
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kfree_rcu(v, rcu);
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}
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/* Strip the tag from the packet. Will return skb with tci set 0. */
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static struct sk_buff *br_vlan_untag(struct sk_buff *skb)
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{
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if (skb->protocol != htons(ETH_P_8021Q)) {
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skb->vlan_tci = 0;
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return skb;
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}
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skb->vlan_tci = 0;
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skb = vlan_untag(skb);
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if (skb)
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skb->vlan_tci = 0;
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return skb;
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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 (!br->vlan_enabled)
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goto out;
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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 taged.
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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 = br_vlan_untag(skb);
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else {
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/* Egress policy says "send tagged". If output device
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* is the bridge, we need to add the VLAN header
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* ourselves since we'll be going through the RX path.
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* Sending to ports puts the frame on the TX path and
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* we let dev_hard_start_xmit() add the header.
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*/
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if (skb->protocol != htons(ETH_P_8021Q) &&
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pv->port_idx == 0) {
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/* vlan_put_tag expects skb->data to point to
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* mac header.
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*/
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skb_push(skb, ETH_HLEN);
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skb = __vlan_put_tag(skb, skb->vlan_proto, skb->vlan_tci);
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if (!skb)
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goto out;
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/* put skb->data back to where it was */
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skb_pull(skb, ETH_HLEN);
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skb->vlan_tci = 0;
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}
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}
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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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/* 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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return true;
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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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return false;
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if (br_vlan_get_tag(skb, vid)) {
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u16 pvid = br_get_pvid(v);
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/* Frame did not have a tag. See if pvid is set
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* on this port. That tells us which vlan untagged
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* traffic belongs to.
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*/
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if (pvid == VLAN_N_VID)
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return false;
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/* PVID is set on this port. Any untagged ingress
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* frame is considered to belong to this vlan.
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*/
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__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 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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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 (!br->vlan_enabled)
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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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/* Must be protected by RTNL */
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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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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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if (vid) {
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/* If the VID !=0 remove fdb for this vid. VID 0 is special
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* in that it's the default and is always there in the fdb.
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*/
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spin_lock_bh(&br->hash_lock);
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fdb_delete_by_addr(br, br->dev->dev_addr, vid);
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spin_unlock_bh(&br->hash_lock);
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}
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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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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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unlock:
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rtnl_unlock();
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return 0;
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}
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/* Must be protected by RTNL */
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int nbp_vlan_add(struct net_bridge_port *port, 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(port->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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err = -ENOMEM;
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goto clean_up;
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}
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pv->port_idx = port->port_no;
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pv->parent.port = port;
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err = __vlan_add(pv, vid, flags);
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if (err)
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goto clean_up;
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rcu_assign_pointer(port->vlan_info, pv);
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return 0;
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clean_up:
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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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int nbp_vlan_delete(struct net_bridge_port *port, 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(port->vlan_info);
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if (!pv)
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return -EINVAL;
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if (vid) {
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/* If the VID !=0 remove fdb for this vid. VID 0 is special
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* in that it's the default and is always there in the fdb.
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*/
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spin_lock_bh(&port->br->hash_lock);
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fdb_delete_by_addr(port->br, port->dev->dev_addr, vid);
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spin_unlock_bh(&port->br->hash_lock);
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}
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return __vlan_del(pv, vid);
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}
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void nbp_vlan_flush(struct net_bridge_port *port)
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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(port->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 nbp_vlan_find(struct net_bridge_port *port, 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(port->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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