1 #include <linux/kernel.h>
2 #include <linux/netdevice.h>
3 #include <linux/rtnetlink.h>
4 #include <linux/slab.h>
5 #include <net/switchdev.h>
7 #include "br_private.h"
9 static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
18 static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
27 static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
29 if (flags & BRIDGE_VLAN_INFO_PVID)
30 __vlan_add_pvid(v, vid);
32 __vlan_delete_pvid(v, vid);
34 if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
35 set_bit(vid, v->untagged_bitmap);
37 clear_bit(vid, v->untagged_bitmap);
40 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
43 const struct net_device_ops *ops = dev->netdev_ops;
46 /* If driver uses VLAN ndo ops, use 8021q to install vid
47 * on device, otherwise try switchdev ops to install vid.
50 if (ops->ndo_vlan_rx_add_vid) {
51 err = vlan_vid_add(dev, br->vlan_proto, vid);
53 struct switchdev_obj vlan_obj = {
54 .id = SWITCHDEV_OBJ_PORT_VLAN,
62 err = switchdev_port_obj_add(dev, &vlan_obj);
63 if (err == -EOPNOTSUPP)
70 static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
72 struct net_bridge_port *p = NULL;
73 struct net_bridge *br;
74 struct net_device *dev;
77 if (test_bit(vid, v->vlan_bitmap)) {
78 __vlan_add_flags(v, vid, flags);
92 /* Add VLAN to the device filter if it is supported.
93 * This ensures tagged traffic enters the bridge when
94 * promiscuous mode is disabled by br_manage_promisc().
96 err = __vlan_vid_add(dev, br, vid, flags);
101 err = br_fdb_insert(br, p, dev->dev_addr, vid);
103 br_err(br, "failed insert local address into bridge "
104 "forwarding table\n");
108 set_bit(vid, v->vlan_bitmap);
110 __vlan_add_flags(v, vid, flags);
116 vlan_vid_del(dev, br->vlan_proto, vid);
120 static void __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
123 const struct net_device_ops *ops = dev->netdev_ops;
125 /* If driver uses VLAN ndo ops, use 8021q to delete vid
126 * on device, otherwise try switchdev ops to delete vid.
129 if (ops->ndo_vlan_rx_kill_vid) {
130 vlan_vid_del(dev, br->vlan_proto, vid);
132 struct switchdev_obj vlan_obj = {
133 .id = SWITCHDEV_OBJ_PORT_VLAN,
140 switchdev_port_obj_del(dev, &vlan_obj);
144 static int __vlan_del(struct net_port_vlans *v, u16 vid)
146 if (!test_bit(vid, v->vlan_bitmap))
149 __vlan_delete_pvid(v, vid);
150 clear_bit(vid, v->untagged_bitmap);
153 struct net_bridge_port *p = v->parent.port;
154 __vlan_vid_del(p->dev, p->br, vid);
157 clear_bit(vid, v->vlan_bitmap);
159 if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
161 RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
163 RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
169 static void __vlan_flush(struct net_port_vlans *v)
173 bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
175 RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
177 RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
181 struct sk_buff *br_handle_vlan(struct net_bridge *br,
182 const struct net_port_vlans *pv,
187 /* If this packet was not filtered at input, let it pass */
188 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
191 /* Vlan filter table must be configured at this point. The
192 * only exception is the bridge is set in promisc mode and the
193 * packet is destined for the bridge device. In this case
194 * pass the packet as is.
197 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
205 /* At this point, we know that the frame was filtered and contains
206 * a valid vlan id. If the vlan id is set in the untagged bitmap,
207 * send untagged; otherwise, send tagged.
209 br_vlan_get_tag(skb, &vid);
210 if (test_bit(vid, pv->untagged_bitmap))
217 /* Called under RCU */
218 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
219 struct sk_buff *skb, u16 *vid)
224 /* If VLAN filtering is disabled on the bridge, all packets are
227 if (!br->vlan_enabled) {
228 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
232 /* If there are no vlan in the permitted list, all packets are
238 BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
239 proto = br->vlan_proto;
241 /* If vlan tx offload is disabled on bridge device and frame was
242 * sent from vlan device on the bridge device, it does not have
243 * HW accelerated vlan tag.
245 if (unlikely(!skb_vlan_tag_present(skb) &&
246 skb->protocol == proto)) {
247 skb = skb_vlan_untag(skb);
252 if (!br_vlan_get_tag(skb, vid)) {
254 if (skb->vlan_proto != proto) {
255 /* Protocol-mismatch, empty out vlan_tci for new tag */
256 skb_push(skb, ETH_HLEN);
257 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
258 skb_vlan_tag_get(skb));
262 skb_pull(skb, ETH_HLEN);
263 skb_reset_mac_len(skb);
275 u16 pvid = br_get_pvid(v);
277 /* Frame had a tag with VID 0 or did not have a tag.
278 * See if pvid is set on this port. That tells us which
279 * vlan untagged or priority-tagged traffic belongs to.
284 /* PVID is set on this port. Any untagged or priority-tagged
285 * ingress frame is considered to belong to this vlan.
289 /* Untagged Frame. */
290 __vlan_hwaccel_put_tag(skb, proto, pvid);
292 /* Priority-tagged Frame.
293 * At this point, We know that skb->vlan_tci had
294 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
295 * We update only VID field and preserve PCP field.
297 skb->vlan_tci |= pvid;
302 /* Frame had a valid vlan tag. See if vlan is allowed */
303 if (test_bit(*vid, v->vlan_bitmap))
310 /* Called under RCU. */
311 bool br_allowed_egress(struct net_bridge *br,
312 const struct net_port_vlans *v,
313 const struct sk_buff *skb)
317 /* If this packet was not filtered at input, let it pass */
318 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
324 br_vlan_get_tag(skb, &vid);
325 if (test_bit(vid, v->vlan_bitmap))
331 /* Called under RCU */
332 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
334 struct net_bridge *br = p->br;
335 struct net_port_vlans *v;
337 /* If filtering was disabled at input, let it pass. */
338 if (!br->vlan_enabled)
341 v = rcu_dereference(p->vlan_info);
345 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
349 *vid = br_get_pvid(v);
356 if (test_bit(*vid, v->vlan_bitmap))
362 /* Must be protected by RTNL.
363 * Must be called with vid in range from 1 to 4094 inclusive.
365 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
367 struct net_port_vlans *pv = NULL;
372 pv = rtnl_dereference(br->vlan_info);
374 return __vlan_add(pv, vid, flags);
376 /* Create port vlan infomration
378 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
383 err = __vlan_add(pv, vid, flags);
387 rcu_assign_pointer(br->vlan_info, pv);
394 /* Must be protected by RTNL.
395 * Must be called with vid in range from 1 to 4094 inclusive.
397 int br_vlan_delete(struct net_bridge *br, u16 vid)
399 struct net_port_vlans *pv;
403 pv = rtnl_dereference(br->vlan_info);
407 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
413 void br_vlan_flush(struct net_bridge *br)
415 struct net_port_vlans *pv;
418 pv = rtnl_dereference(br->vlan_info);
425 bool br_vlan_find(struct net_bridge *br, u16 vid)
427 struct net_port_vlans *pv;
431 pv = rcu_dereference(br->vlan_info);
436 if (test_bit(vid, pv->vlan_bitmap))
444 /* Must be protected by RTNL. */
445 static void recalculate_group_addr(struct net_bridge *br)
447 if (br->group_addr_set)
450 spin_lock_bh(&br->lock);
451 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
452 /* Bridge Group Address */
453 br->group_addr[5] = 0x00;
454 } else { /* vlan_enabled && ETH_P_8021AD */
455 /* Provider Bridge Group Address */
456 br->group_addr[5] = 0x08;
458 spin_unlock_bh(&br->lock);
461 /* Must be protected by RTNL. */
462 void br_recalculate_fwd_mask(struct net_bridge *br)
464 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
465 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
466 else /* vlan_enabled && ETH_P_8021AD */
467 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
468 ~(1u << br->group_addr[5]);
471 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
473 if (br->vlan_enabled == val)
476 br->vlan_enabled = val;
477 br_manage_promisc(br);
478 recalculate_group_addr(br);
479 br_recalculate_fwd_mask(br);
484 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
487 return restart_syscall();
489 __br_vlan_filter_toggle(br, val);
495 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
498 struct net_bridge_port *p;
499 struct net_port_vlans *pv;
503 if (br->vlan_proto == proto)
506 /* Add VLANs for the new proto to the device filter. */
507 list_for_each_entry(p, &br->port_list, list) {
508 pv = rtnl_dereference(p->vlan_info);
512 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
513 err = vlan_vid_add(p->dev, proto, vid);
519 oldproto = br->vlan_proto;
520 br->vlan_proto = proto;
522 recalculate_group_addr(br);
523 br_recalculate_fwd_mask(br);
525 /* Delete VLANs for the old proto from the device filter. */
526 list_for_each_entry(p, &br->port_list, list) {
527 pv = rtnl_dereference(p->vlan_info);
531 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
532 vlan_vid_del(p->dev, oldproto, vid);
539 for_each_set_bit(vid, pv->vlan_bitmap, errvid)
540 vlan_vid_del(p->dev, proto, vid);
542 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
543 pv = rtnl_dereference(p->vlan_info);
547 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
548 vlan_vid_del(p->dev, proto, vid);
554 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
558 if (val != ETH_P_8021Q && val != ETH_P_8021AD)
559 return -EPROTONOSUPPORT;
562 return restart_syscall();
564 err = __br_vlan_set_proto(br, htons(val));
570 static bool vlan_default_pvid(struct net_port_vlans *pv, u16 vid)
572 return pv && vid == pv->pvid && test_bit(vid, pv->untagged_bitmap);
575 static void br_vlan_disable_default_pvid(struct net_bridge *br)
577 struct net_bridge_port *p;
578 u16 pvid = br->default_pvid;
580 /* Disable default_pvid on all ports where it is still
583 if (vlan_default_pvid(br_get_vlan_info(br), pvid))
584 br_vlan_delete(br, pvid);
586 list_for_each_entry(p, &br->port_list, list) {
587 if (vlan_default_pvid(nbp_get_vlan_info(p), pvid))
588 nbp_vlan_delete(p, pvid);
591 br->default_pvid = 0;
594 static int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
596 struct net_bridge_port *p;
599 unsigned long *changed;
601 changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
606 old_pvid = br->default_pvid;
608 /* Update default_pvid config only if we do not conflict with
609 * user configuration.
611 if ((!old_pvid || vlan_default_pvid(br_get_vlan_info(br), old_pvid)) &&
612 !br_vlan_find(br, pvid)) {
613 err = br_vlan_add(br, pvid,
614 BRIDGE_VLAN_INFO_PVID |
615 BRIDGE_VLAN_INFO_UNTAGGED);
618 br_vlan_delete(br, old_pvid);
622 list_for_each_entry(p, &br->port_list, list) {
623 /* Update default_pvid config only if we do not conflict with
624 * user configuration.
627 !vlan_default_pvid(nbp_get_vlan_info(p), old_pvid)) ||
628 nbp_vlan_find(p, pvid))
631 err = nbp_vlan_add(p, pvid,
632 BRIDGE_VLAN_INFO_PVID |
633 BRIDGE_VLAN_INFO_UNTAGGED);
636 nbp_vlan_delete(p, old_pvid);
637 set_bit(p->port_no, changed);
640 br->default_pvid = pvid;
647 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
648 if (!test_bit(p->port_no, changed))
652 nbp_vlan_add(p, old_pvid,
653 BRIDGE_VLAN_INFO_PVID |
654 BRIDGE_VLAN_INFO_UNTAGGED);
655 nbp_vlan_delete(p, pvid);
658 if (test_bit(0, changed)) {
660 br_vlan_add(br, old_pvid,
661 BRIDGE_VLAN_INFO_PVID |
662 BRIDGE_VLAN_INFO_UNTAGGED);
663 br_vlan_delete(br, pvid);
668 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
673 if (val >= VLAN_VID_MASK)
677 return restart_syscall();
679 if (pvid == br->default_pvid)
682 /* Only allow default pvid change when filtering is disabled */
683 if (br->vlan_enabled) {
684 pr_info_once("Please disable vlan filtering to change default_pvid\n");
690 br_vlan_disable_default_pvid(br);
692 err = __br_vlan_set_default_pvid(br, pvid);
699 int br_vlan_init(struct net_bridge *br)
701 br->vlan_proto = htons(ETH_P_8021Q);
702 br->default_pvid = 1;
703 return br_vlan_add(br, 1,
704 BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED);
707 /* Must be protected by RTNL.
708 * Must be called with vid in range from 1 to 4094 inclusive.
710 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
712 struct net_port_vlans *pv = NULL;
717 pv = rtnl_dereference(port->vlan_info);
719 return __vlan_add(pv, vid, flags);
721 /* Create port vlan infomration
723 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
729 pv->port_idx = port->port_no;
730 pv->parent.port = port;
731 err = __vlan_add(pv, vid, flags);
735 rcu_assign_pointer(port->vlan_info, pv);
743 /* Must be protected by RTNL.
744 * Must be called with vid in range from 1 to 4094 inclusive.
746 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
748 struct net_port_vlans *pv;
752 pv = rtnl_dereference(port->vlan_info);
756 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
757 br_fdb_delete_by_port(port->br, port, vid, 0);
759 return __vlan_del(pv, vid);
762 void nbp_vlan_flush(struct net_bridge_port *port)
764 struct net_port_vlans *pv;
769 pv = rtnl_dereference(port->vlan_info);
773 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
774 vlan_vid_del(port->dev, port->br->vlan_proto, vid);
779 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
781 struct net_port_vlans *pv;
785 pv = rcu_dereference(port->vlan_info);
790 if (test_bit(vid, pv->vlan_bitmap))
798 int nbp_vlan_init(struct net_bridge_port *p)
800 return p->br->default_pvid ?
801 nbp_vlan_add(p, p->br->default_pvid,
802 BRIDGE_VLAN_INFO_PVID |
803 BRIDGE_VLAN_INFO_UNTAGGED) :