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 inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
12 const struct net_bridge_vlan *vle = ptr;
13 u16 vid = *(u16 *)arg->key;
15 return vle->vid != vid;
18 static const struct rhashtable_params br_vlan_rht_params = {
19 .head_offset = offsetof(struct net_bridge_vlan, vnode),
20 .key_offset = offsetof(struct net_bridge_vlan, vid),
21 .key_len = sizeof(u16),
24 .max_size = VLAN_N_VID,
25 .obj_cmpfn = br_vlan_cmp,
26 .automatic_shrinking = true,
29 static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
31 return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
34 static void __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
43 static void __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
52 static void __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
54 struct net_bridge_vlan_group *vg;
56 if (br_vlan_is_master(v))
57 vg = br_vlan_group(v->br);
59 vg = nbp_vlan_group(v->port);
61 if (flags & BRIDGE_VLAN_INFO_PVID)
62 __vlan_add_pvid(vg, v->vid);
64 __vlan_delete_pvid(vg, v->vid);
66 if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
67 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
69 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
72 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
75 struct switchdev_obj_port_vlan v = {
76 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
83 /* Try switchdev op first. In case it is not supported, fallback to
86 err = switchdev_port_obj_add(dev, &v.obj);
87 if (err == -EOPNOTSUPP)
88 return vlan_vid_add(dev, br->vlan_proto, vid);
92 static void __vlan_add_list(struct net_bridge_vlan *v)
94 struct net_bridge_vlan_group *vg;
95 struct list_head *headp, *hpos;
96 struct net_bridge_vlan *vent;
98 if (br_vlan_is_master(v))
99 vg = br_vlan_group(v->br);
101 vg = nbp_vlan_group(v->port);
103 headp = &vg->vlan_list;
104 list_for_each_prev(hpos, headp) {
105 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
106 if (v->vid < vent->vid)
111 list_add_rcu(&v->vlist, hpos);
114 static void __vlan_del_list(struct net_bridge_vlan *v)
116 list_del_rcu(&v->vlist);
119 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
122 struct switchdev_obj_port_vlan v = {
123 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
129 /* Try switchdev op first. In case it is not supported, fallback to
132 err = switchdev_port_obj_del(dev, &v.obj);
133 if (err == -EOPNOTSUPP) {
134 vlan_vid_del(dev, br->vlan_proto, vid);
140 /* Returns a master vlan, if it didn't exist it gets created. In all cases a
141 * a reference is taken to the master vlan before returning.
143 static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
145 struct net_bridge_vlan_group *vg;
146 struct net_bridge_vlan *masterv;
148 vg = br_vlan_group(br);
149 masterv = br_vlan_find(vg, vid);
151 /* missing global ctx, create it now */
152 if (br_vlan_add(br, vid, 0))
154 masterv = br_vlan_find(vg, vid);
155 if (WARN_ON(!masterv))
158 atomic_inc(&masterv->refcnt);
163 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
165 struct net_bridge_vlan_group *vg;
167 if (!br_vlan_is_master(masterv))
170 vg = br_vlan_group(masterv->br);
171 if (atomic_dec_and_test(&masterv->refcnt)) {
172 rhashtable_remove_fast(&vg->vlan_hash,
173 &masterv->vnode, br_vlan_rht_params);
174 __vlan_del_list(masterv);
175 kfree_rcu(masterv, rcu);
179 /* This is the shared VLAN add function which works for both ports and bridge
180 * devices. There are four possible calls to this function in terms of the
182 * 1. vlan is being added on a port (no master flags, global entry exists)
183 * 2. vlan is being added on a bridge (both master and brvlan flags)
184 * 3. vlan is being added on a port, but a global entry didn't exist which
185 * is being created right now (master flag set, brvlan flag unset), the
186 * global entry is used for global per-vlan features, but not for filtering
187 * 4. same as 3 but with both master and brvlan flags set so the entry
188 * will be used for filtering in both the port and the bridge
190 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
192 struct net_bridge_vlan *masterv = NULL;
193 struct net_bridge_port *p = NULL;
194 struct net_bridge_vlan_group *vg;
195 struct net_device *dev;
196 struct net_bridge *br;
199 if (br_vlan_is_master(v)) {
202 vg = br_vlan_group(br);
207 vg = nbp_vlan_group(p);
211 /* Add VLAN to the device filter if it is supported.
212 * This ensures tagged traffic enters the bridge when
213 * promiscuous mode is disabled by br_manage_promisc().
215 err = __vlan_vid_add(dev, br, v->vid, flags);
219 /* need to work on the master vlan too */
220 if (flags & BRIDGE_VLAN_INFO_MASTER) {
221 err = br_vlan_add(br, v->vid, flags |
222 BRIDGE_VLAN_INFO_BRENTRY);
227 masterv = br_vlan_get_master(br, v->vid);
233 /* Add the dev mac and count the vlan only if it's usable */
234 if (br_vlan_should_use(v)) {
235 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
237 br_err(br, "failed insert local address into bridge forwarding table\n");
243 err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
249 __vlan_add_flags(v, flags);
254 if (br_vlan_should_use(v)) {
255 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
261 __vlan_vid_del(dev, br, v->vid);
263 br_vlan_put_master(masterv);
271 static int __vlan_del(struct net_bridge_vlan *v)
273 struct net_bridge_vlan *masterv = v;
274 struct net_bridge_vlan_group *vg;
275 struct net_bridge_port *p = NULL;
278 if (br_vlan_is_master(v)) {
279 vg = br_vlan_group(v->br);
282 vg = nbp_vlan_group(v->port);
286 __vlan_delete_pvid(vg, v->vid);
288 err = __vlan_vid_del(p->dev, p->br, v->vid);
293 if (br_vlan_should_use(v)) {
294 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
299 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
305 br_vlan_put_master(masterv);
310 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
312 WARN_ON(!list_empty(&vg->vlan_list));
313 rhashtable_destroy(&vg->vlan_hash);
317 static void __vlan_flush(struct net_bridge_vlan_group *vg)
319 struct net_bridge_vlan *vlan, *tmp;
321 __vlan_delete_pvid(vg, vg->pvid);
322 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
326 struct sk_buff *br_handle_vlan(struct net_bridge *br,
327 struct net_bridge_vlan_group *vg,
330 struct net_bridge_vlan *v;
333 /* If this packet was not filtered at input, let it pass */
334 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
337 /* At this point, we know that the frame was filtered and contains
338 * a valid vlan id. If the vlan id has untagged flag set,
339 * send untagged; otherwise, send tagged.
341 br_vlan_get_tag(skb, &vid);
342 v = br_vlan_find(vg, vid);
343 /* Vlan entry must be configured at this point. The
344 * only exception is the bridge is set in promisc mode and the
345 * packet is destined for the bridge device. In this case
346 * pass the packet as is.
348 if (!v || !br_vlan_should_use(v)) {
349 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
356 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
363 /* Called under RCU */
364 static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto,
365 struct sk_buff *skb, u16 *vid)
367 const struct net_bridge_vlan *v;
370 BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
371 /* If vlan tx offload is disabled on bridge device and frame was
372 * sent from vlan device on the bridge device, it does not have
373 * HW accelerated vlan tag.
375 if (unlikely(!skb_vlan_tag_present(skb) &&
376 skb->protocol == proto)) {
377 skb = skb_vlan_untag(skb);
382 if (!br_vlan_get_tag(skb, vid)) {
384 if (skb->vlan_proto != proto) {
385 /* Protocol-mismatch, empty out vlan_tci for new tag */
386 skb_push(skb, ETH_HLEN);
387 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
388 skb_vlan_tag_get(skb));
392 skb_pull(skb, ETH_HLEN);
393 skb_reset_mac_len(skb);
405 u16 pvid = br_get_pvid(vg);
407 /* Frame had a tag with VID 0 or did not have a tag.
408 * See if pvid is set on this port. That tells us which
409 * vlan untagged or priority-tagged traffic belongs to.
414 /* PVID is set on this port. Any untagged or priority-tagged
415 * ingress frame is considered to belong to this vlan.
419 /* Untagged Frame. */
420 __vlan_hwaccel_put_tag(skb, proto, pvid);
422 /* Priority-tagged Frame.
423 * At this point, We know that skb->vlan_tci had
424 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
425 * We update only VID field and preserve PCP field.
427 skb->vlan_tci |= pvid;
432 /* Frame had a valid vlan tag. See if vlan is allowed */
433 v = br_vlan_find(vg, *vid);
434 if (v && br_vlan_should_use(v))
441 bool br_allowed_ingress(const struct net_bridge *br,
442 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
445 /* If VLAN filtering is disabled on the bridge, all packets are
448 if (!br->vlan_enabled) {
449 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
453 return __allowed_ingress(vg, br->vlan_proto, skb, vid);
456 /* Called under RCU. */
457 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
458 const struct sk_buff *skb)
460 const struct net_bridge_vlan *v;
463 /* If this packet was not filtered at input, let it pass */
464 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
467 br_vlan_get_tag(skb, &vid);
468 v = br_vlan_find(vg, vid);
469 if (v && br_vlan_should_use(v))
475 /* Called under RCU */
476 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
478 struct net_bridge_vlan_group *vg;
479 struct net_bridge *br = p->br;
481 /* If filtering was disabled at input, let it pass. */
482 if (!br->vlan_enabled)
485 vg = nbp_vlan_group(p);
486 if (!vg || !vg->num_vlans)
489 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
493 *vid = br_get_pvid(vg);
500 if (br_vlan_find(vg, *vid))
506 /* Must be protected by RTNL.
507 * Must be called with vid in range from 1 to 4094 inclusive.
509 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
511 struct net_bridge_vlan_group *vg;
512 struct net_bridge_vlan *vlan;
517 vg = br_vlan_group(br);
518 vlan = br_vlan_find(vg, vid);
520 if (!br_vlan_is_brentry(vlan)) {
521 /* Trying to change flags of non-existent bridge vlan */
522 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
524 /* It was only kept for port vlans, now make it real */
525 ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
528 br_err(br, "failed insert local address into bridge forwarding table\n");
531 atomic_inc(&vlan->refcnt);
532 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
535 __vlan_add_flags(vlan, flags);
539 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
544 vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
545 vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
547 if (flags & BRIDGE_VLAN_INFO_BRENTRY)
548 atomic_set(&vlan->refcnt, 1);
549 ret = __vlan_add(vlan, flags);
556 /* Must be protected by RTNL.
557 * Must be called with vid in range from 1 to 4094 inclusive.
559 int br_vlan_delete(struct net_bridge *br, u16 vid)
561 struct net_bridge_vlan_group *vg;
562 struct net_bridge_vlan *v;
566 vg = br_vlan_group(br);
567 v = br_vlan_find(vg, vid);
568 if (!v || !br_vlan_is_brentry(v))
571 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
572 br_fdb_delete_by_port(br, NULL, vid, 0);
574 return __vlan_del(v);
577 void br_vlan_flush(struct net_bridge *br)
579 struct net_bridge_vlan_group *vg;
583 vg = br_vlan_group(br);
585 RCU_INIT_POINTER(br->vlgrp, NULL);
587 __vlan_group_free(vg);
590 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
595 return br_vlan_lookup(&vg->vlan_hash, vid);
598 /* Must be protected by RTNL. */
599 static void recalculate_group_addr(struct net_bridge *br)
601 if (br->group_addr_set)
604 spin_lock_bh(&br->lock);
605 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
606 /* Bridge Group Address */
607 br->group_addr[5] = 0x00;
608 } else { /* vlan_enabled && ETH_P_8021AD */
609 /* Provider Bridge Group Address */
610 br->group_addr[5] = 0x08;
612 spin_unlock_bh(&br->lock);
615 /* Must be protected by RTNL. */
616 void br_recalculate_fwd_mask(struct net_bridge *br)
618 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
619 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
620 else /* vlan_enabled && ETH_P_8021AD */
621 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
622 ~(1u << br->group_addr[5]);
625 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
627 if (br->vlan_enabled == val)
630 br->vlan_enabled = val;
631 br_manage_promisc(br);
632 recalculate_group_addr(br);
633 br_recalculate_fwd_mask(br);
638 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
641 return restart_syscall();
643 __br_vlan_filter_toggle(br, val);
649 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
652 struct net_bridge_port *p;
653 struct net_bridge_vlan *vlan;
654 struct net_bridge_vlan_group *vg;
657 if (br->vlan_proto == proto)
660 /* Add VLANs for the new proto to the device filter. */
661 list_for_each_entry(p, &br->port_list, list) {
662 vg = nbp_vlan_group(p);
663 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
664 err = vlan_vid_add(p->dev, proto, vlan->vid);
670 oldproto = br->vlan_proto;
671 br->vlan_proto = proto;
673 recalculate_group_addr(br);
674 br_recalculate_fwd_mask(br);
676 /* Delete VLANs for the old proto from the device filter. */
677 list_for_each_entry(p, &br->port_list, list) {
678 vg = nbp_vlan_group(p);
679 list_for_each_entry(vlan, &vg->vlan_list, vlist)
680 vlan_vid_del(p->dev, oldproto, vlan->vid);
686 list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
687 vlan_vid_del(p->dev, proto, vlan->vid);
689 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
690 vg = nbp_vlan_group(p);
691 list_for_each_entry(vlan, &vg->vlan_list, vlist)
692 vlan_vid_del(p->dev, proto, vlan->vid);
698 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
702 if (val != ETH_P_8021Q && val != ETH_P_8021AD)
703 return -EPROTONOSUPPORT;
706 return restart_syscall();
708 err = __br_vlan_set_proto(br, htons(val));
714 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
716 struct net_bridge_vlan *v;
721 v = br_vlan_lookup(&vg->vlan_hash, vid);
722 if (v && br_vlan_should_use(v) &&
723 (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
729 static void br_vlan_disable_default_pvid(struct net_bridge *br)
731 struct net_bridge_port *p;
732 u16 pvid = br->default_pvid;
734 /* Disable default_pvid on all ports where it is still
737 if (vlan_default_pvid(br_vlan_group(br), pvid))
738 br_vlan_delete(br, pvid);
740 list_for_each_entry(p, &br->port_list, list) {
741 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
742 nbp_vlan_delete(p, pvid);
745 br->default_pvid = 0;
748 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
750 const struct net_bridge_vlan *pvent;
751 struct net_bridge_vlan_group *vg;
752 struct net_bridge_port *p;
755 unsigned long *changed;
758 br_vlan_disable_default_pvid(br);
762 changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
767 old_pvid = br->default_pvid;
769 /* Update default_pvid config only if we do not conflict with
770 * user configuration.
772 vg = br_vlan_group(br);
773 pvent = br_vlan_find(vg, pvid);
774 if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
775 (!pvent || !br_vlan_should_use(pvent))) {
776 err = br_vlan_add(br, pvid,
777 BRIDGE_VLAN_INFO_PVID |
778 BRIDGE_VLAN_INFO_UNTAGGED |
779 BRIDGE_VLAN_INFO_BRENTRY);
782 br_vlan_delete(br, old_pvid);
786 list_for_each_entry(p, &br->port_list, list) {
787 /* Update default_pvid config only if we do not conflict with
788 * user configuration.
790 vg = nbp_vlan_group(p);
792 !vlan_default_pvid(vg, old_pvid)) ||
793 br_vlan_find(vg, pvid))
796 err = nbp_vlan_add(p, pvid,
797 BRIDGE_VLAN_INFO_PVID |
798 BRIDGE_VLAN_INFO_UNTAGGED);
801 nbp_vlan_delete(p, old_pvid);
802 set_bit(p->port_no, changed);
805 br->default_pvid = pvid;
812 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
813 if (!test_bit(p->port_no, changed))
817 nbp_vlan_add(p, old_pvid,
818 BRIDGE_VLAN_INFO_PVID |
819 BRIDGE_VLAN_INFO_UNTAGGED);
820 nbp_vlan_delete(p, pvid);
823 if (test_bit(0, changed)) {
825 br_vlan_add(br, old_pvid,
826 BRIDGE_VLAN_INFO_PVID |
827 BRIDGE_VLAN_INFO_UNTAGGED |
828 BRIDGE_VLAN_INFO_BRENTRY);
829 br_vlan_delete(br, pvid);
834 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
839 if (val >= VLAN_VID_MASK)
843 return restart_syscall();
845 if (pvid == br->default_pvid)
848 /* Only allow default pvid change when filtering is disabled */
849 if (br->vlan_enabled) {
850 pr_info_once("Please disable vlan filtering to change default_pvid\n");
854 err = __br_vlan_set_default_pvid(br, pvid);
860 int br_vlan_init(struct net_bridge *br)
862 struct net_bridge_vlan_group *vg;
865 vg = kzalloc(sizeof(*vg), GFP_KERNEL);
868 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
871 INIT_LIST_HEAD(&vg->vlan_list);
872 br->vlan_proto = htons(ETH_P_8021Q);
873 br->default_pvid = 1;
874 rcu_assign_pointer(br->vlgrp, vg);
875 ret = br_vlan_add(br, 1,
876 BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
877 BRIDGE_VLAN_INFO_BRENTRY);
885 rhashtable_destroy(&vg->vlan_hash);
892 int nbp_vlan_init(struct net_bridge_port *p)
894 struct net_bridge_vlan_group *vg;
897 vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
901 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
904 INIT_LIST_HEAD(&vg->vlan_list);
905 rcu_assign_pointer(p->vlgrp, vg);
906 if (p->br->default_pvid) {
907 ret = nbp_vlan_add(p, p->br->default_pvid,
908 BRIDGE_VLAN_INFO_PVID |
909 BRIDGE_VLAN_INFO_UNTAGGED);
917 rhashtable_destroy(&vg->vlan_hash);
924 /* Must be protected by RTNL.
925 * Must be called with vid in range from 1 to 4094 inclusive.
927 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
929 struct net_bridge_vlan *vlan;
934 vlan = br_vlan_find(nbp_vlan_group(port), vid);
936 __vlan_add_flags(vlan, flags);
940 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
946 ret = __vlan_add(vlan, flags);
953 /* Must be protected by RTNL.
954 * Must be called with vid in range from 1 to 4094 inclusive.
956 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
958 struct net_bridge_vlan *v;
962 v = br_vlan_find(nbp_vlan_group(port), vid);
965 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
966 br_fdb_delete_by_port(port->br, port, vid, 0);
968 return __vlan_del(v);
971 void nbp_vlan_flush(struct net_bridge_port *port)
973 struct net_bridge_vlan_group *vg;
977 vg = nbp_vlan_group(port);
979 RCU_INIT_POINTER(port->vlgrp, NULL);
981 __vlan_group_free(vg);