1 #include <linux/kernel.h>
2 #include <linux/netdevice.h>
3 #include <linux/rtnetlink.h>
4 #include <linux/slab.h>
6 #include "br_private.h"
8 static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
17 static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
26 static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
28 if (flags & BRIDGE_VLAN_INFO_PVID)
29 __vlan_add_pvid(v, vid);
31 if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
32 set_bit(vid, v->untagged_bitmap);
35 static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
37 const struct net_device_ops *ops;
38 struct net_bridge_port *p = NULL;
39 struct net_bridge *br;
40 struct net_device *dev;
43 if (test_bit(vid, v->vlan_bitmap)) {
44 __vlan_add_flags(v, vid, flags);
56 ops = dev->netdev_ops;
58 if (p && (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
59 /* Add VLAN to the device filter if it is supported.
60 * Stricly speaking, this is not necessary now, since
61 * devices are made promiscuous by the bridge, but if
62 * that ever changes this code will allow tagged
63 * traffic to enter the bridge.
65 err = ops->ndo_vlan_rx_add_vid(dev, htons(ETH_P_8021Q),
71 err = br_fdb_insert(br, p, dev->dev_addr, vid);
73 br_err(br, "failed insert local address into bridge "
74 "forwarding table\n");
78 set_bit(vid, v->vlan_bitmap);
80 __vlan_add_flags(v, vid, flags);
85 if (p && (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
86 ops->ndo_vlan_rx_kill_vid(dev, htons(ETH_P_8021Q), vid);
90 static int __vlan_del(struct net_port_vlans *v, u16 vid)
92 if (!test_bit(vid, v->vlan_bitmap))
95 __vlan_delete_pvid(v, vid);
96 clear_bit(vid, v->untagged_bitmap);
99 struct net_device *dev = v->parent.port->dev;
100 const struct net_device_ops *ops = dev->netdev_ops;
102 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
103 ops->ndo_vlan_rx_kill_vid(dev, htons(ETH_P_8021Q), vid);
106 clear_bit(vid, v->vlan_bitmap);
108 if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
110 rcu_assign_pointer(v->parent.port->vlan_info, NULL);
112 rcu_assign_pointer(v->parent.br->vlan_info, NULL);
118 static void __vlan_flush(struct net_port_vlans *v)
122 bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
124 rcu_assign_pointer(v->parent.port->vlan_info, NULL);
126 rcu_assign_pointer(v->parent.br->vlan_info, NULL);
130 /* Strip the tag from the packet. Will return skb with tci set 0. */
131 static struct sk_buff *br_vlan_untag(struct sk_buff *skb)
133 if (skb->protocol != htons(ETH_P_8021Q)) {
139 skb = vlan_untag(skb);
146 struct sk_buff *br_handle_vlan(struct net_bridge *br,
147 const struct net_port_vlans *pv,
152 if (!br->vlan_enabled)
155 /* At this point, we know that the frame was filtered and contains
156 * a valid vlan id. If the vlan id is set in the untagged bitmap,
157 * send untagged; otherwise, send taged.
159 br_vlan_get_tag(skb, &vid);
160 if (test_bit(vid, pv->untagged_bitmap))
161 skb = br_vlan_untag(skb);
163 /* Egress policy says "send tagged". If output device
164 * is the bridge, we need to add the VLAN header
165 * ourselves since we'll be going through the RX path.
166 * Sending to ports puts the frame on the TX path and
167 * we let dev_hard_start_xmit() add the header.
169 if (skb->protocol != htons(ETH_P_8021Q) &&
171 /* vlan_put_tag expects skb->data to point to
174 skb_push(skb, ETH_HLEN);
175 skb = __vlan_put_tag(skb, skb->vlan_proto, skb->vlan_tci);
178 /* put skb->data back to where it was */
179 skb_pull(skb, ETH_HLEN);
188 /* Called under RCU */
189 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
190 struct sk_buff *skb, u16 *vid)
192 /* If VLAN filtering is disabled on the bridge, all packets are
195 if (!br->vlan_enabled)
198 /* If there are no vlan in the permitted list, all packets are
204 if (br_vlan_get_tag(skb, vid)) {
205 u16 pvid = br_get_pvid(v);
207 /* Frame did not have a tag. See if pvid is set
208 * on this port. That tells us which vlan untagged
209 * traffic belongs to.
211 if (pvid == VLAN_N_VID)
214 /* PVID is set on this port. Any untagged ingress
215 * frame is considered to belong to this vlan.
217 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), pvid);
221 /* Frame had a valid vlan tag. See if vlan is allowed */
222 if (test_bit(*vid, v->vlan_bitmap))
228 /* Called under RCU. */
229 bool br_allowed_egress(struct net_bridge *br,
230 const struct net_port_vlans *v,
231 const struct sk_buff *skb)
235 if (!br->vlan_enabled)
241 br_vlan_get_tag(skb, &vid);
242 if (test_bit(vid, v->vlan_bitmap))
248 /* Must be protected by RTNL.
249 * Must be called with vid in range from 1 to 4094 inclusive.
251 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
253 struct net_port_vlans *pv = NULL;
258 pv = rtnl_dereference(br->vlan_info);
260 return __vlan_add(pv, vid, flags);
262 /* Create port vlan infomration
264 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
269 err = __vlan_add(pv, vid, flags);
273 rcu_assign_pointer(br->vlan_info, pv);
280 /* Must be protected by RTNL.
281 * Must be called with vid in range from 1 to 4094 inclusive.
283 int br_vlan_delete(struct net_bridge *br, u16 vid)
285 struct net_port_vlans *pv;
289 pv = rtnl_dereference(br->vlan_info);
293 spin_lock_bh(&br->hash_lock);
294 fdb_delete_by_addr(br, br->dev->dev_addr, vid);
295 spin_unlock_bh(&br->hash_lock);
301 void br_vlan_flush(struct net_bridge *br)
303 struct net_port_vlans *pv;
306 pv = rtnl_dereference(br->vlan_info);
313 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
316 return restart_syscall();
318 if (br->vlan_enabled == val)
321 br->vlan_enabled = val;
328 /* Must be protected by RTNL.
329 * Must be called with vid in range from 1 to 4094 inclusive.
331 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
333 struct net_port_vlans *pv = NULL;
338 pv = rtnl_dereference(port->vlan_info);
340 return __vlan_add(pv, vid, flags);
342 /* Create port vlan infomration
344 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
350 pv->port_idx = port->port_no;
351 pv->parent.port = port;
352 err = __vlan_add(pv, vid, flags);
356 rcu_assign_pointer(port->vlan_info, pv);
364 /* Must be protected by RTNL.
365 * Must be called with vid in range from 1 to 4094 inclusive.
367 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
369 struct net_port_vlans *pv;
373 pv = rtnl_dereference(port->vlan_info);
377 spin_lock_bh(&port->br->hash_lock);
378 fdb_delete_by_addr(port->br, port->dev->dev_addr, vid);
379 spin_unlock_bh(&port->br->hash_lock);
381 return __vlan_del(pv, vid);
384 void nbp_vlan_flush(struct net_bridge_port *port)
386 struct net_port_vlans *pv;
390 pv = rtnl_dereference(port->vlan_info);
397 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
399 struct net_port_vlans *pv;
403 pv = rcu_dereference(port->vlan_info);
408 if (test_bit(vid, pv->vlan_bitmap))