path: root/net/bridge/br_vlan.c

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <net/switchdev.h>

#include "br_private.h"
#include "br_private_tunnel.h"

static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
			      const void *ptr)
{
	const struct net_bridge_vlan *vle = ptr;
	u16 vid = *(u16 *)arg->key;

	return vle->vid != vid;
}

static const struct rhashtable_params br_vlan_rht_params = {
	.head_offset = offsetof(struct net_bridge_vlan, vnode),
	.key_offset = offsetof(struct net_bridge_vlan, vid),
	.key_len = sizeof(u16),
	.nelem_hint = 3,
	.locks_mul = 1,
	.max_size = VLAN_N_VID,
	.obj_cmpfn = br_vlan_cmp,
	.automatic_shrinking = true,
};

static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
{
	return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
}

static bool __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
{
	if (vg->pvid == vid)
		return false;

	smp_wmb();
	vg->pvid = vid;

	return true;
}

static bool __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
{
	if (vg->pvid != vid)
		return false;

	smp_wmb();
	vg->pvid = 0;

	return true;
}

/* return true if anything changed, false otherwise */
static bool __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
{
	struct net_bridge_vlan_group *vg;
	u16 old_flags = v->flags;
	bool ret;

	if (br_vlan_is_master(v))
		vg = br_vlan_group(v->br);
	else
		vg = nbp_vlan_group(v->port);

	if (flags & BRIDGE_VLAN_INFO_PVID)
		ret = __vlan_add_pvid(vg, v->vid);
	else
		ret = __vlan_delete_pvid(vg, v->vid);

	if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
		v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
	else
		v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;

	return ret || !!(old_flags ^ v->flags);
}

static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
			  struct net_bridge_vlan *v, u16 flags,
			  struct netlink_ext_ack *extack)
{
	int err;

	/* Try switchdev op first. In case it is not supported, fallback to
	 * 8021q add.
	 */
	err = br_switchdev_port_vlan_add(dev, v->vid, flags, extack);
	if (err == -EOPNOTSUPP)
		return vlan_vid_add(dev, br->vlan_proto, v->vid);
	v->priv_flags |= BR_VLFLAG_ADDED_BY_SWITCHDEV;
	return err;
}

static void __vlan_add_list(struct net_bridge_vlan *v)
{
	struct net_bridge_vlan_group *vg;
	struct list_head *headp, *hpos;
	struct net_bridge_vlan *vent;

	if (br_vlan_is_master(