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
)
194 /* If VLAN filtering is disabled on the bridge, all packets are
197 if (!br
->vlan_enabled
)
200 /* If there are no vlan in the permitted list, all packets are
206 err
= br_vlan_get_tag(skb
, vid
);
208 u16 pvid
= br_get_pvid(v
);
210 /* Frame had a tag with VID 0 or did not have a tag.
211 * See if pvid is set on this port. That tells us which
212 * vlan untagged or priority-tagged traffic belongs to.
214 if (pvid
== VLAN_N_VID
)
217 /* PVID is set on this port. Any untagged or priority-tagged
218 * ingress frame is considered to belong to this vlan.
222 /* Untagged Frame. */
223 __vlan_hwaccel_put_tag(skb
, htons(ETH_P_8021Q
), pvid
);
225 /* Priority-tagged Frame.
226 * At this point, We know that skb->vlan_tci had
227 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
228 * We update only VID field and preserve PCP field.
230 skb
->vlan_tci
|= pvid
;
235 /* Frame had a valid vlan tag. See if vlan is allowed */
236 if (test_bit(*vid
, v
->vlan_bitmap
))
242 /* Called under RCU. */
243 bool br_allowed_egress(struct net_bridge
*br
,
244 const struct net_port_vlans
*v
,
245 const struct sk_buff
*skb
)
249 if (!br
->vlan_enabled
)
255 br_vlan_get_tag(skb
, &vid
);
256 if (test_bit(vid
, v
->vlan_bitmap
))
262 /* Must be protected by RTNL.
263 * Must be called with vid in range from 1 to 4094 inclusive.
265 int br_vlan_add(struct net_bridge
*br
, u16 vid
, u16 flags
)
267 struct net_port_vlans
*pv
= NULL
;
272 pv
= rtnl_dereference(br
->vlan_info
);
274 return __vlan_add(pv
, vid
, flags
);
276 /* Create port vlan infomration
278 pv
= kzalloc(sizeof(*pv
), GFP_KERNEL
);
283 err
= __vlan_add(pv
, vid
, flags
);
287 rcu_assign_pointer(br
->vlan_info
, pv
);
294 /* Must be protected by RTNL.
295 * Must be called with vid in range from 1 to 4094 inclusive.
297 int br_vlan_delete(struct net_bridge
*br
, u16 vid
)
299 struct net_port_vlans
*pv
;
303 pv
= rtnl_dereference(br
->vlan_info
);
307 spin_lock_bh(&br
->hash_lock
);
308 fdb_delete_by_addr(br
, br
->dev
->dev_addr
, vid
);
309 spin_unlock_bh(&br
->hash_lock
);
315 void br_vlan_flush(struct net_bridge
*br
)
317 struct net_port_vlans
*pv
;
320 pv
= rtnl_dereference(br
->vlan_info
);
327 int br_vlan_filter_toggle(struct net_bridge
*br
, unsigned long val
)
330 return restart_syscall();
332 if (br
->vlan_enabled
== val
)
335 br
->vlan_enabled
= val
;
342 /* Must be protected by RTNL.
343 * Must be called with vid in range from 1 to 4094 inclusive.
345 int nbp_vlan_add(struct net_bridge_port
*port
, u16 vid
, u16 flags
)
347 struct net_port_vlans
*pv
= NULL
;
352 pv
= rtnl_dereference(port
->vlan_info
);
354 return __vlan_add(pv
, vid
, flags
);
356 /* Create port vlan infomration
358 pv
= kzalloc(sizeof(*pv
), GFP_KERNEL
);
364 pv
->port_idx
= port
->port_no
;
365 pv
->parent
.port
= port
;
366 err
= __vlan_add(pv
, vid
, flags
);
370 rcu_assign_pointer(port
->vlan_info
, pv
);
378 /* Must be protected by RTNL.
379 * Must be called with vid in range from 1 to 4094 inclusive.
381 int nbp_vlan_delete(struct net_bridge_port
*port
, u16 vid
)
383 struct net_port_vlans
*pv
;
387 pv
= rtnl_dereference(port
->vlan_info
);
391 spin_lock_bh(&port
->br
->hash_lock
);
392 fdb_delete_by_addr(port
->br
, port
->dev
->dev_addr
, vid
);
393 spin_unlock_bh(&port
->br
->hash_lock
);
395 return __vlan_del(pv
, vid
);
398 void nbp_vlan_flush(struct net_bridge_port
*port
)
400 struct net_port_vlans
*pv
;
404 pv
= rtnl_dereference(port
->vlan_info
);
411 bool nbp_vlan_find(struct net_bridge_port
*port
, u16 vid
)
413 struct net_port_vlans
*pv
;
417 pv
= rcu_dereference(port
->vlan_info
);
422 if (test_bit(vid
, pv
->vlan_bitmap
))