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 int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
123 const struct net_device_ops *ops = dev->netdev_ops;
126 /* If driver uses VLAN ndo ops, use 8021q to delete vid
127 * on device, otherwise try switchdev ops to delete vid.
130 if (ops->ndo_vlan_rx_kill_vid) {
131 vlan_vid_del(dev, br->vlan_proto, vid);
133 struct switchdev_obj vlan_obj = {
134 .id = SWITCHDEV_OBJ_PORT_VLAN,
141 err = switchdev_port_obj_del(dev, &vlan_obj);
142 if (err == -EOPNOTSUPP)
149 static int __vlan_del(struct net_port_vlans *v, u16 vid)
151 if (!test_bit(vid, v->vlan_bitmap))
154 __vlan_delete_pvid(v, vid);
155 clear_bit(vid, v->untagged_bitmap);
158 struct net_bridge_port *p = v->parent.port;
161 err = __vlan_vid_del(p->dev, p->br, vid);
166 clear_bit(vid, v->vlan_bitmap);
168 if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
170 RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
172 RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
178 static void __vlan_flush(struct net_port_vlans *v)
182 bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
184 RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
186 RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
190 struct sk_buff *br_handle_vlan(struct net_bridge *br,
191 const struct net_port_vlans *pv,
196 /* If this packet was not filtered at input, let it pass */
197 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
200 /* Vlan filter table must be configured at this point. The
201 * only exception is the bridge is set in promisc mode and the
202 * packet is destined for the bridge device. In this case
203 * pass the packet as is.
206 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
214 /* At this point, we know that the frame was filtered and contains
215 * a valid vlan id. If the vlan id is set in the untagged bitmap,
216 * send untagged; otherwise, send tagged.
218 br_vlan_get_tag(skb, &vid);
219 if (test_bit(vid, pv->untagged_bitmap))
226 /* Called under RCU */
227 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
228 struct sk_buff *skb, u16 *vid)
233 /* If VLAN filtering is disabled on the bridge, all packets are
236 if (!br->vlan_enabled) {
237 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
241 /* If there are no vlan in the permitted list, all packets are
247 BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
248 proto = br->vlan_proto;
250 /* If vlan tx offload is disabled on bridge device and frame was
251 * sent from vlan device on the bridge device, it does not have
252 * HW accelerated vlan tag.
254 if (unlikely(!skb_vlan_tag_present(skb) &&
255 skb->protocol == proto)) {
256 skb = skb_vlan_untag(skb);
261 if (!br_vlan_get_tag(skb, vid)) {
263 if (skb->vlan_proto != proto) {
264 /* Protocol-mismatch, empty out vlan_tci for new tag */
265 skb_push(skb, ETH_HLEN);
266 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
267 skb_vlan_tag_get(skb));
271 skb_pull(skb, ETH_HLEN);
272 skb_reset_mac_len(skb);
284 u16 pvid = br_get_pvid(v);
286 /* Frame had a tag with VID 0 or did not have a tag.
287 * See if pvid is set on this port. That tells us which
288 * vlan untagged or priority-tagged traffic belongs to.
293 /* PVID is set on this port. Any untagged or priority-tagged
294 * ingress frame is considered to belong to this vlan.
298 /* Untagged Frame. */
299 __vlan_hwaccel_put_tag(skb, proto, pvid);
301 /* Priority-tagged Frame.
302 * At this point, We know that skb->vlan_tci had
303 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
304 * We update only VID field and preserve PCP field.
306 skb->vlan_tci |= pvid;
311 /* Frame had a valid vlan tag. See if vlan is allowed */
312 if (test_bit(*vid, v->vlan_bitmap))
319 /* Called under RCU. */
320 bool br_allowed_egress(struct net_bridge *br,
321 const struct net_port_vlans *v,
322 const struct sk_buff *skb)
326 /* If this packet was not filtered at input, let it pass */
327 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
333 br_vlan_get_tag(skb, &vid);
334 if (test_bit(vid, v->vlan_bitmap))
340 /* Called under RCU */
341 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
343 struct net_bridge *br = p->br;
344 struct net_port_vlans *v;
346 /* If filtering was disabled at input, let it pass. */
347 if (!br->vlan_enabled)
350 v = rcu_dereference(p->vlan_info);
354 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
358 *vid = br_get_pvid(v);
365 if (test_bit(*vid, v->vlan_bitmap))
371 /* Must be protected by RTNL.
372 * Must be called with vid in range from 1 to 4094 inclusive.
374 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
376 struct net_port_vlans *pv = NULL;
381 pv = rtnl_dereference(br->vlan_info);
383 return __vlan_add(pv, vid, flags);
385 /* Create port vlan infomration
387 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
392 err = __vlan_add(pv, vid, flags);
396 rcu_assign_pointer(br->vlan_info, pv);
403 /* Must be protected by RTNL.
404 * Must be called with vid in range from 1 to 4094 inclusive.
406 int br_vlan_delete(struct net_bridge *br, u16 vid)
408 struct net_port_vlans *pv;
412 pv = rtnl_dereference(br->vlan_info);
416 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
422 void br_vlan_flush(struct net_bridge *br)
424 struct net_port_vlans *pv;
427 pv = rtnl_dereference(br->vlan_info);
434 bool br_vlan_find(struct net_bridge *br, u16 vid)
436 struct net_port_vlans *pv;
440 pv = rcu_dereference(br->vlan_info);
445 if (test_bit(vid, pv->vlan_bitmap))
453 /* Must be protected by RTNL. */
454 static void recalculate_group_addr(struct net_bridge *br)
456 if (br->group_addr_set)
459 spin_lock_bh(&br->lock);
460 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
461 /* Bridge Group Address */
462 br->group_addr[5] = 0x00;
463 } else { /* vlan_enabled && ETH_P_8021AD */
464 /* Provider Bridge Group Address */
465 br->group_addr[5] = 0x08;
467 spin_unlock_bh(&br->lock);
470 /* Must be protected by RTNL. */
471 void br_recalculate_fwd_mask(struct net_bridge *br)
473 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
474 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
475 else /* vlan_enabled && ETH_P_8021AD */
476 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
477 ~(1u << br->group_addr[5]);
480 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
482 if (br->vlan_enabled == val)
485 br->vlan_enabled = val;
486 br_manage_promisc(br);
487 recalculate_group_addr(br);
488 br_recalculate_fwd_mask(br);
493 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
496 return restart_syscall();
498 __br_vlan_filter_toggle(br, val);
504 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
507 struct net_bridge_port *p;
508 struct net_port_vlans *pv;
512 if (br->vlan_proto == proto)
515 /* Add VLANs for the new proto to the device filter. */
516 list_for_each_entry(p, &br->port_list, list) {
517 pv = rtnl_dereference(p->vlan_info);
521 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
522 err = vlan_vid_add(p->dev, proto, vid);
528 oldproto = br->vlan_proto;
529 br->vlan_proto = proto;
531 recalculate_group_addr(br);
532 br_recalculate_fwd_mask(br);
534 /* Delete VLANs for the old proto from the device filter. */
535 list_for_each_entry(p, &br->port_list, list) {
536 pv = rtnl_dereference(p->vlan_info);
540 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
541 vlan_vid_del(p->dev, oldproto, vid);
548 for_each_set_bit(vid, pv->vlan_bitmap, errvid)
549 vlan_vid_del(p->dev, proto, vid);
551 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
552 pv = rtnl_dereference(p->vlan_info);
556 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
557 vlan_vid_del(p->dev, proto, vid);
563 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
567 if (val != ETH_P_8021Q && val != ETH_P_8021AD)
568 return -EPROTONOSUPPORT;
571 return restart_syscall();
573 err = __br_vlan_set_proto(br, htons(val));
579 static bool vlan_default_pvid(struct net_port_vlans *pv, u16 vid)
581 return pv && vid == pv->pvid && test_bit(vid, pv->untagged_bitmap);
584 static void br_vlan_disable_default_pvid(struct net_bridge *br)
586 struct net_bridge_port *p;
587 u16 pvid = br->default_pvid;
589 /* Disable default_pvid on all ports where it is still
592 if (vlan_default_pvid(br_get_vlan_info(br), pvid))
593 br_vlan_delete(br, pvid);
595 list_for_each_entry(p, &br->port_list, list) {
596 if (vlan_default_pvid(nbp_get_vlan_info(p), pvid))
597 nbp_vlan_delete(p, pvid);
600 br->default_pvid = 0;
603 static int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
605 struct net_bridge_port *p;
608 unsigned long *changed;
610 changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
615 old_pvid = br->default_pvid;
617 /* Update default_pvid config only if we do not conflict with
618 * user configuration.
620 if ((!old_pvid || vlan_default_pvid(br_get_vlan_info(br), old_pvid)) &&
621 !br_vlan_find(br, pvid)) {
622 err = br_vlan_add(br, pvid,
623 BRIDGE_VLAN_INFO_PVID |
624 BRIDGE_VLAN_INFO_UNTAGGED);
627 br_vlan_delete(br, old_pvid);
631 list_for_each_entry(p, &br->port_list, list) {
632 /* Update default_pvid config only if we do not conflict with
633 * user configuration.
636 !vlan_default_pvid(nbp_get_vlan_info(p), old_pvid)) ||
637 nbp_vlan_find(p, pvid))
640 err = nbp_vlan_add(p, pvid,
641 BRIDGE_VLAN_INFO_PVID |
642 BRIDGE_VLAN_INFO_UNTAGGED);
645 nbp_vlan_delete(p, old_pvid);
646 set_bit(p->port_no, changed);
649 br->default_pvid = pvid;
656 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
657 if (!test_bit(p->port_no, changed))
661 nbp_vlan_add(p, old_pvid,
662 BRIDGE_VLAN_INFO_PVID |
663 BRIDGE_VLAN_INFO_UNTAGGED);
664 nbp_vlan_delete(p, pvid);
667 if (test_bit(0, changed)) {
669 br_vlan_add(br, old_pvid,
670 BRIDGE_VLAN_INFO_PVID |
671 BRIDGE_VLAN_INFO_UNTAGGED);
672 br_vlan_delete(br, pvid);
677 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
682 if (val >= VLAN_VID_MASK)
686 return restart_syscall();
688 if (pvid == br->default_pvid)
691 /* Only allow default pvid change when filtering is disabled */
692 if (br->vlan_enabled) {
693 pr_info_once("Please disable vlan filtering to change default_pvid\n");
699 br_vlan_disable_default_pvid(br);
701 err = __br_vlan_set_default_pvid(br, pvid);
708 int br_vlan_init(struct net_bridge *br)
710 br->vlan_proto = htons(ETH_P_8021Q);
711 br->default_pvid = 1;
712 return br_vlan_add(br, 1,
713 BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED);
716 /* Must be protected by RTNL.
717 * Must be called with vid in range from 1 to 4094 inclusive.
719 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
721 struct net_port_vlans *pv = NULL;
726 pv = rtnl_dereference(port->vlan_info);
728 return __vlan_add(pv, vid, flags);
730 /* Create port vlan infomration
732 pv = kzalloc(sizeof(*pv), GFP_KERNEL);
738 pv->port_idx = port->port_no;
739 pv->parent.port = port;
740 err = __vlan_add(pv, vid, flags);
744 rcu_assign_pointer(port->vlan_info, pv);
752 /* Must be protected by RTNL.
753 * Must be called with vid in range from 1 to 4094 inclusive.
755 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
757 struct net_port_vlans *pv;
761 pv = rtnl_dereference(port->vlan_info);
765 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
766 br_fdb_delete_by_port(port->br, port, vid, 0);
768 return __vlan_del(pv, vid);
771 void nbp_vlan_flush(struct net_bridge_port *port)
773 struct net_port_vlans *pv;
778 pv = rtnl_dereference(port->vlan_info);
782 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
783 vlan_vid_del(port->dev, port->br->vlan_proto, vid);
788 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
790 struct net_port_vlans *pv;
794 pv = rcu_dereference(port->vlan_info);
799 if (test_bit(vid, pv->vlan_bitmap))
807 int nbp_vlan_init(struct net_bridge_port *p)
809 return p->br->default_pvid ?
810 nbp_vlan_add(p, p->br->default_pvid,
811 BRIDGE_VLAN_INFO_PVID |
812 BRIDGE_VLAN_INFO_UNTAGGED) :