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 struct net_bridge_port *p = NULL;
38 struct net_bridge *br;
39 struct net_device *dev;
42 if (test_bit(vid, v->vlan_bitmap)) {
43 __vlan_add_flags(v, vid, flags);
57 /* Add VLAN to the device filter if it is supported.
58 * Stricly speaking, this is not necessary now, since
59 * devices are made promiscuous by the bridge, but if
60 * that ever changes this code will allow tagged
61 * traffic to enter the bridge.
63 err = vlan_vid_add(dev, br->vlan_proto, vid);
68 err = br_fdb_insert(br, p, dev->dev_addr, vid);
70 br_err(br, "failed insert local address into bridge "
71 "forwarding table\n");
75 set_bit(vid, v->vlan_bitmap);
77 __vlan_add_flags(v, vid, flags);
83 vlan_vid_del(dev, br->vlan_proto, vid);
87 static int __vlan_del(struct net_port_vlans *v, u16 vid)
89 if (!test_bit(vid, v->vlan_bitmap))
92 __vlan_delete_pvid(v, vid);
93 clear_bit(vid, v->untagged_bitmap);
96 struct net_bridge_port *p = v->parent.port;
97 vlan_vid_del(p->dev, p->br->vlan_proto, vid);
100 clear_bit(vid, v->vlan_bitmap);
102 if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
104 RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
106 RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
112 static void __vlan_flush(struct net_port_vlans *v)
116 bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
118 RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
120 RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
124 struct sk_buff *br_handle_vlan(struct net_bridge *br,
125 const struct net_port_vlans *pv,
130 if (!br->vlan_enabled)
133 /* Vlan filter table must be configured at this point. The
134 * only exception is the bridge is set in promisc mode and the
135 * packet is destined for the bridge device. In this case
136 * pass the packet as is.
139 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
147 /* At this point, we know that the frame was filtered and contains
148 * a valid vlan id. If the vlan id is set in the untagged bitmap,
149 * send untagged; otherwise, send tagged.
151 br_vlan_get_tag(skb, &vid);
152 if (test_bit(vid, pv->untagged_bitmap))
159 /* Called under RCU */
160 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
161 struct sk_buff *skb, u16 *vid)
166 /* If VLAN filtering is disabled on the bridge, all packets are
169 if (!br->vlan_enabled)
172 /* If there are no vlan in the permitted list, all packets are
178 proto = br->vlan_proto;
180 /* If vlan tx offload is disabled on bridge device and frame was
181 * sent from vlan device on the bridge device, it does not have
182 * HW accelerated vlan tag.
184 if (unlikely(!vlan_tx_tag_present(skb) &&
185 skb->protocol == proto)) {
186 skb = vlan_untag(skb);
191 if (!br_vlan_get_tag(skb, vid)) {
193 if (skb->vlan_proto != proto) {
194 /* Protocol-mismatch, empty out vlan_tci for new tag */
195 skb_push(skb, ETH_HLEN);
196 skb = __vlan_put_tag(skb, skb->vlan_proto,
197 vlan_tx_tag_get(skb));
201 skb_pull(skb, ETH_HLEN);
202 skb_reset_mac_len(skb);
214 u16 pvid = br_get_pvid(v);
216 /* Frame had a tag with VID 0 or did not have a tag.
217 * See if pvid is set on this port. That tells us which
218 * vlan untagged or priority-tagged traffic belongs to.
220 if (pvid == VLAN_N_VID)
223 /* PVID is set on this port. Any untagged or priority-tagged
224 * ingress frame is considered to belong to this vlan.
228 /* Untagged Frame. */
229 __vlan_hwaccel_put_tag(skb, proto, pvid);
231 /* Priority-tagged Frame.
232 * At this point, We know that skb->vlan_tci had
233 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
234 * We update only VID field and preserve PCP field.
236 skb->vlan_tci |= pvid;
241 /* Frame had a valid vlan tag. See if vlan is allowed */
242 if (test_bit(*vid, v->vlan_bitmap))
249 /* Called under RCU. */
250 bool br_allowed_egress(struct net_bridge *br,
251 const struct net_port_vlans *v,
252 const struct sk_buff *skb)
256 if (!br->vlan_enabled)
262 br_vlan_get_tag(skb, &vid);
263 if (test_bit(vid, v->vlan_bitmap))
269 /* Called under RCU */
270 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
272 struct net_bridge *br = p->br;
273 struct net_port_vlans *v;
275 if (!br->vlan_enabled)
278 v = rcu_dereference(p->vlan_info);
282 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
286 *vid = br_get_pvid(v);
287 if (*vid == VLAN_N_VID)
293 if (test_bit(*vid, v->vlan_bitmap))
299 /* Must be protected by RTNL.
300 * Must be called with vid in range from 1 to 4094 inclusive.
302 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
304 struct net_port_vlans *pv = NULL;
309 pv = rtnl_dereference(br->vlan_info);
311 return __vlan_add(pv, vid, flags);
313 /* Create port vlan infomration
315 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
320 err = __vlan_add(pv, vid, flags);
324 rcu_assign_pointer(br->vlan_info, pv);
331 /* Must be protected by RTNL.
332 * Must be called with vid in range from 1 to 4094 inclusive.
334 int br_vlan_delete(struct net_bridge *br, u16 vid)
336 struct net_port_vlans *pv;
340 pv = rtnl_dereference(br->vlan_info);
344 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
350 void br_vlan_flush(struct net_bridge *br)
352 struct net_port_vlans *pv;
355 pv = rtnl_dereference(br->vlan_info);
362 bool br_vlan_find(struct net_bridge *br, u16 vid)
364 struct net_port_vlans *pv;
368 pv = rcu_dereference(br->vlan_info);
373 if (test_bit(vid, pv->vlan_bitmap))
381 /* Must be protected by RTNL. */
382 static void recalculate_group_addr(struct net_bridge *br)
384 if (br->group_addr_set)
387 spin_lock_bh(&br->lock);
388 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
389 /* Bridge Group Address */
390 br->group_addr[5] = 0x00;
391 } else { /* vlan_enabled && ETH_P_8021AD */
392 /* Provider Bridge Group Address */
393 br->group_addr[5] = 0x08;
395 spin_unlock_bh(&br->lock);
398 /* Must be protected by RTNL. */
399 void br_recalculate_fwd_mask(struct net_bridge *br)
401 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
402 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
403 else /* vlan_enabled && ETH_P_8021AD */
404 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
405 ~(1u << br->group_addr[5]);
408 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
411 return restart_syscall();
413 if (br->vlan_enabled == val)
416 br->vlan_enabled = val;
417 br_manage_promisc(br);
418 recalculate_group_addr(br);
419 br_recalculate_fwd_mask(br);
426 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
429 struct net_bridge_port *p;
430 struct net_port_vlans *pv;
431 __be16 proto, oldproto;
434 if (val != ETH_P_8021Q && val != ETH_P_8021AD)
435 return -EPROTONOSUPPORT;
438 return restart_syscall();
441 if (br->vlan_proto == proto)
444 /* Add VLANs for the new proto to the device filter. */
445 list_for_each_entry(p, &br->port_list, list) {
446 pv = rtnl_dereference(p->vlan_info);
450 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
451 err = vlan_vid_add(p->dev, proto, vid);
457 oldproto = br->vlan_proto;
458 br->vlan_proto = proto;
460 recalculate_group_addr(br);
461 br_recalculate_fwd_mask(br);
463 /* Delete VLANs for the old proto from the device filter. */
464 list_for_each_entry(p, &br->port_list, list) {
465 pv = rtnl_dereference(p->vlan_info);
469 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
470 vlan_vid_del(p->dev, oldproto, vid);
479 for_each_set_bit(vid, pv->vlan_bitmap, errvid)
480 vlan_vid_del(p->dev, proto, vid);
482 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
483 pv = rtnl_dereference(p->vlan_info);
487 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
488 vlan_vid_del(p->dev, proto, vid);
494 void br_vlan_init(struct net_bridge *br)
496 br->vlan_proto = htons(ETH_P_8021Q);
499 /* Must be protected by RTNL.
500 * Must be called with vid in range from 1 to 4094 inclusive.
502 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
504 struct net_port_vlans *pv = NULL;
509 pv = rtnl_dereference(port->vlan_info);
511 return __vlan_add(pv, vid, flags);
513 /* Create port vlan infomration
515 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
521 pv->port_idx = port->port_no;
522 pv->parent.port = port;
523 err = __vlan_add(pv, vid, flags);
527 rcu_assign_pointer(port->vlan_info, pv);
535 /* Must be protected by RTNL.
536 * Must be called with vid in range from 1 to 4094 inclusive.
538 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
540 struct net_port_vlans *pv;
544 pv = rtnl_dereference(port->vlan_info);
548 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
550 return __vlan_del(pv, vid);
553 void nbp_vlan_flush(struct net_bridge_port *port)
555 struct net_port_vlans *pv;
560 pv = rtnl_dereference(port->vlan_info);
564 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
565 vlan_vid_del(port->dev, port->br->vlan_proto, vid);
570 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
572 struct net_port_vlans *pv;
576 pv = rcu_dereference(port->vlan_info);
581 if (test_bit(vid, pv->vlan_bitmap))