net/bridge/br_vlan.c

Source file repositories/reference/linux-study-clean/net/bridge/br_vlan.c

File Facts

System
Linux kernel
Corpus path
net/bridge/br_vlan.c
Extension
.c
Size
57511 bytes
Lines
2356
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct br_vlan_bind_walk_data {
	u16 vid;
	struct net_device *result;
};

static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev,
					  struct netdev_nested_priv *priv)
{
	struct br_vlan_bind_walk_data *data = priv->data;
	int found = 0;

	if (br_vlan_is_bind_vlan_dev(dev) &&
	    vlan_dev_priv(dev)->vlan_id == data->vid) {
		data->result = dev;
		found = 1;
	}

	return found;
}

static struct net_device *
br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid)
{
	struct br_vlan_bind_walk_data data = {
		.vid = vid,
	};
	struct netdev_nested_priv priv = {
		.data = (void *)&data,
	};

	rcu_read_lock();
	netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn,
				      &priv);
	rcu_read_unlock();

	return data.result;
}

static bool br_vlan_is_dev_up(const struct net_device *dev)
{
	return  !!(dev->flags & IFF_UP) && netif_oper_up(dev);
}

static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
				       struct net_device *vlan_dev)
{
	u16 vid = vlan_dev_priv(vlan_dev)->vlan_id;
	struct net_bridge_vlan_group *vg;
	struct net_bridge_port *p;
	bool has_carrier = false;

	if (!netif_carrier_ok(br->dev)) {
		netif_carrier_off(vlan_dev);
		return;
	}

	list_for_each_entry(p, &br->port_list, list) {
		vg = nbp_vlan_group(p);
		if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
			has_carrier = true;
			break;
		}
	}

	if (has_carrier)
		netif_carrier_on(vlan_dev);
	else
		netif_carrier_off(vlan_dev);
}

static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
{
	struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
	struct net_bridge_vlan *vlan;
	struct net_device *vlan_dev;

	list_for_each_entry(vlan, &vg->vlan_list, vlist) {
		vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
							   vlan->vid);
		if (vlan_dev) {
			if (br_vlan_is_dev_up(p->dev)) {
				if (netif_carrier_ok(p->br->dev))
					netif_carrier_on(vlan_dev);
			} else {
				br_vlan_set_vlan_dev_state(p->br, vlan_dev);
			}
		}
	}
}

Annotation

Implementation Notes