cregit-Linux how code gets into the kernel

Release 4.11 net/bridge/br_vlan.c

Directory: net/bridge
#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;
}


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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);
}


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

	smp_wmb();
	vg->pvid = vid;
}


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

	smp_wmb();
	vg->pvid = 0;
}


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static void __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
{
	struct net_bridge_vlan_group *vg;

	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)
		__vlan_add_pvid(vg, v->vid);
	else
		__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;
}


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static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
			  u16 vid, u16 flags)
{
	struct switchdev_obj_port_vlan v = {
		.obj.orig_dev = dev,
		.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
		.flags = flags,
		.vid_begin = vid,
		.vid_end = vid,
        };
	int err;

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


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Total95100.00%8100.00%






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

	headp = &vg->vlan_list;
	list_for_each_prev(hpos, headp) {
		vent = list_entry(hpos, struct net_bridge_vlan, vlist);
		if (v->vid < vent->vid)
			continue;
		else
			break;
	}
	list_add_rcu(&v->vlist, hpos);
}


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static void __vlan_del_list(struct net_bridge_vlan *v)
{
	list_del_rcu(&v->vlist);
}


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static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
			  u16 vid)
{
	struct switchdev_obj_port_vlan v = {
		.obj.orig_dev = dev,
		.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
		.vid_begin = vid,
		.vid_end = vid,
        };
	int err;

	/* Try switchdev op first. In case it is not supported, fallback to
         * 8021q del.
         */
	err = switchdev_port_obj_del(dev, &v.obj);
	if (err == -EOPNOTSUPP) {
		vlan_vid_del(dev, br->vlan_proto, vid);
		return 0;
	}
	return err;
}


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Total91100.00%9100.00%



/* Returns a master vlan, if it didn't exist it gets created. In all cases a
 * a reference is taken to the master vlan before returning.
 */



static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_vlan *masterv;

	vg = br_vlan_group(br);
	masterv = br_vlan_find(vg, vid);
	if (!masterv) {
		/* missing global ctx, create it now */
		if (br_vlan_add(br, vid, 0))
			return NULL;
		masterv = br_vlan_find(vg, vid);
		if (WARN_ON(!masterv))
			return NULL;
	}
	atomic_inc(&masterv->refcnt);

	return masterv;
}


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static void br_master_vlan_rcu_free(struct rcu_head *rcu)
{
	struct net_bridge_vlan *v;

	v = container_of(rcu, struct net_bridge_vlan, rcu);
	WARN_ON(!br_vlan_is_master(v));
	free_percpu(v->stats);
	v->stats = NULL;
	kfree(v);
}


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static void br_vlan_put_master(struct net_bridge_vlan *masterv)
{
	struct net_bridge_vlan_group *vg;

	if (!br_vlan_is_master(masterv))
		return;

	vg = br_vlan_group(masterv->br);
	if (atomic_dec_and_test(&masterv->refcnt)) {
		rhashtable_remove_fast(&vg->vlan_hash,
				       &masterv->vnode, br_vlan_rht_params);
		__vlan_del_list(masterv);
		call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
	}
}


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/* This is the shared VLAN add function which works for both ports and bridge
 * devices. There are four possible calls to this function in terms of the
 * vlan entry type:
 * 1. vlan is being added on a port (no master flags, global entry exists)
 * 2. vlan is being added on a bridge (both master and brentry flags)
 * 3. vlan is being added on a port, but a global entry didn't exist which
 *    is being created right now (master flag set, brentry flag unset), the
 *    global entry is used for global per-vlan features, but not for filtering
 * 4. same as 3 but with both master and brentry flags set so the entry
 *    will be used for filtering in both the port and the bridge
 */



static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
{
	struct net_bridge_vlan *masterv = NULL;
	struct net_bridge_port *p = NULL;
	struct net_bridge_vlan_group *vg;
	struct net_device *dev;
	struct net_bridge *br;
	int err;

	if (br_vlan_is_master(v)) {
		br = v->br;
		dev = br->dev;
		vg = br_vlan_group(br);
	} else {
		p = v->port;
		br = p->br;
		dev = p->dev;
		vg = nbp_vlan_group(p);
	}

	if (p) {
		/* Add VLAN to the device filter if it is supported.
                 * This ensures tagged traffic enters the bridge when
                 * promiscuous mode is disabled by br_manage_promisc().
                 */
		err = __vlan_vid_add(dev, br, v->vid, flags);
		if (err)
			goto out;

		/* need to work on the master vlan too */
		if (flags & BRIDGE_VLAN_INFO_MASTER) {
			err = br_vlan_add(br, v->vid, flags |
						      BRIDGE_VLAN_INFO_BRENTRY);
			if (err)
				goto out_filt;
		}

		masterv = br_vlan_get_master(br, v->vid);
		if (!masterv)
			goto out_filt;
		v->brvlan = masterv;
		v->stats = masterv->stats;
	}

	/* Add the dev mac and count the vlan only if it's usable */
	if (br_vlan_should_use(v)) {
		err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
		if (err) {
			br_err(br, "failed insert local address into bridge forwarding table\n");
			goto out_filt;
		}
		vg->num_vlans++;
	}

	err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
					    br_vlan_rht_params);
	if (err)
		goto out_fdb_insert;

	__vlan_add_list(v);
	__vlan_add_flags(v, flags);
out:
	return err;

out_fdb_insert:
	if (br_vlan_should_use(v)) {
		br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
		vg->num_vlans--;
	}

out_filt:
	if (p) {
		__vlan_vid_del(dev, br, v->vid);
		if (masterv) {
			br_vlan_put_master(masterv);
			v->brvlan = NULL;
		}
	}

	goto out;
}


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static int __vlan_del(struct net_bridge_vlan *v)
{
	struct net_bridge_vlan *masterv = v;
	struct net_bridge_vlan_group *vg;
	struct net_bridge_port *p = NULL;
	int err = 0;

	if (br_vlan_is_master(v)) {
		vg = br_vlan_group(v->br);
	} else {
		p = v->port;
		vg = nbp_vlan_group(v->port);
		masterv = v->brvlan;
	}

	__vlan_delete_pvid(vg, v->vid);
	if (p) {
		err = __vlan_vid_del(p->dev, p->br, v->vid);
		if (err)
			goto out;
	}

	if (br_vlan_should_use(v)) {
		v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
		vg->num_vlans--;
	}

	if (masterv != v) {
		vlan_tunnel_info_del(vg, v);
		rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
				       br_vlan_rht_params);
		__vlan_del_list(v);
		kfree_rcu(v, rcu);
	}

	br_vlan_put_master(masterv);
out:
	return err;
}


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Roopa Prabhu73.70%17.69%


Vivien Didelot63.17%17.69%


Patrick McHardy10.53%17.69%


Scott Feldman10.53%17.69%


Total189100.00%13100.00%






static void __vlan_group_free(struct net_bridge_vlan_group *vg)
{
	WARN_ON(!list_empty(&vg->vlan_list));
	rhashtable_destroy(&vg->vlan_hash);
	vlan_tunnel_deinit(vg);
	kfree(vg);
}


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static void __vlan_flush(struct net_bridge_vlan_group *vg)
{
	struct net_bridge_vlan *vlan, *tmp;

	__vlan_delete_pvid(vg, vg->pvid);
	list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
		__vlan_del(vlan);
}


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struct sk_buff *br_handle_vlan(struct net_bridge *br,
			       const struct net_bridge_port *p,
			       struct net_bridge_vlan_group *vg,
			       struct sk_buff *skb)
{
	struct br_vlan_stats *stats;
	struct net_bridge_vlan *v;
	u16 vid;

	/* If this packet was not filtered at input, let it pass */
	if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
		goto out;

	/* At this point, we know that the frame was filtered and contains
         * a valid vlan id.  If the vlan id has untagged flag set,
         * send untagged; otherwise, send tagged.
         */
	br_vlan_get_tag(skb, &vid);
	v = br_vlan_find(vg, vid);
	/* Vlan entry must be configured at this point.  The
         * only exception is the bridge is set in promisc mode and the
         * packet is destined for the bridge device.  In this case
         * pass the packet as is.
         */
	if (!v || !br_vlan_should_use(v)) {
		if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
			goto out;
		} else {
			kfree_skb(skb);
			return NULL;
		}
	}
	if (br->vlan_stats_enabled) {
		stats = this_cpu_ptr(v->stats);
		u64_stats_update_begin(&stats->syncp);
		stats->tx_bytes += skb->len;
		stats->tx_packets++;
		u64_stats_update_end(&stats->syncp);
	}

	if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
		skb->vlan_tci = 0;

	if (p && (p->flags & BR_VLAN_TUNNEL) &&
	    br_handle_egress_vlan_tunnel(skb, v)) {
		kfree_skb(skb);
		return NULL;
	}
out:
	return skb;
}


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Total217100.00%8100.00%



/* Called under RCU */



static bool __allowed_ingress(const struct net_bridge *br,
			      struct net_bridge_vlan_group *vg,
			      struct sk_buff *skb, u16 *vid)
{
	struct br_vlan_stats *stats;
	struct net_bridge_vlan *v;
	bool tagged;

	BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
	/* If vlan tx offload is disabled on bridge device and frame was
         * sent from vlan device on the bridge device, it does not have
         * HW accelerated vlan tag.
         */
	if (unlikely(!skb_vlan_tag_present(skb) &&
		     skb->protocol == br->vlan_proto)) {
		skb = skb_vlan_untag(skb);
		if (unlikely(!skb))
			return false;
	}

	if (!br_vlan_get_tag(skb, vid)) {
		/* Tagged frame */
		if (skb->vlan_proto != br->vlan_proto) {
			/* Protocol-mismatch, empty out vlan_tci for new tag */
			skb_push(skb, ETH_HLEN);
			skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
							skb_vlan_tag_get(skb));
			if (unlikely(!skb))
				return false;

			skb_pull(skb, ETH_HLEN);
			skb_reset_mac_len(skb);
			*vid = 0;
			tagged = false;
		} else {
			tagged = true;
		}
	} else {
		/* Untagged frame */
		tagged = false;
	}

	if (!*vid) {
		u16 pvid = br_get_pvid(vg);

		/* Frame had a tag with VID 0 or did not have a tag.
                 * See if pvid is set on this port.  That tells us which
                 * vlan untagged or priority-tagged traffic belongs to.
                 */
		if (!pvid)
			goto drop;

		/* PVID is set on this port.  Any untagged or priority-tagged
                 * ingress frame is considered to belong to this vlan.
                 */
		*vid = pvid;
		if (likely(!tagged))
			/* Untagged Frame. */
			__vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
		else
			/* Priority-tagged Frame.
                         * At this point, We know that skb->vlan_tci had
                         * VLAN_TAG_PRESENT bit and its VID field was 0x000.
                         * We update only VID field and preserve PCP field.
                         */
			skb->vlan_tci |= pvid;

		/* if stats are disabled we can avoid the lookup */
		if (!br->vlan_stats_enabled)
			return true;
	}
	v = br_vlan_find(vg, *vid);
	if (!v || !br_vlan_should_use(v))
		goto drop;

	if (br->vlan_stats_enabled) {
		stats = this_cpu_ptr(v->stats);
		u64_stats_update_begin(&stats->syncp);
		stats->rx_bytes += skb->len;
		stats->rx_packets++;
		u64_stats_update_end(&stats->syncp);
	}

	return true;

drop:
	kfree_skb(skb);
	return false;
}


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Patrick McHardy10.30%16.25%


Total337100.00%16100.00%






bool br_allowed_ingress(const struct net_bridge *br,
			struct net_bridge_vlan_group *vg, struct sk_buff *skb,
			u16 *vid)
{
	/* If VLAN filtering is disabled on the bridge, all packets are
         * permitted.
         */
	if (!br->vlan_enabled) {
		BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
		return true;
	}

	return __allowed_ingress(br, vg, skb, vid);
}


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/* Called under RCU. */



bool br_allowed_egress(struct net_bridge_vlan_group *vg,
		       const struct sk_buff *skb)
{
	const struct net_bridge_vlan *v;
	u16 vid;

	/* If this packet was not filtered at input, let it pass */
	if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
		return true;

	br_vlan_get_tag(skb, &vid);
	v = br_vlan_find(vg, vid);
	if (v && br_vlan_should_use(v))
		return true;

	return false;
}


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/* Called under RCU */



bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge *br = p->br;

	/* If filtering was disabled at input, let it pass. */
	if (!br->vlan_enabled)
		return true;

	vg = nbp_vlan_group_rcu(p);
	if (!vg || !vg->num_vlans)
		return false;

	if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
		*vid = 0;

	if (!*vid) {
		*vid = br_get_pvid(vg);
		if (!*vid)
			return false;

		return true;
	}

	if (br_vlan_find(vg, *vid))
		return true;

	return false;
}


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Total131100.00%10100.00%



/* Must be protected by RTNL.
 * Must be called with vid in range from 1 to 4094 inclusive.
 */



int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_vlan *vlan;
	int ret;

	ASSERT_RTNL();

	vg = br_vlan_group(br);
	vlan = br_vlan_find(vg, vid);
	if (vlan) {
		if (!br_vlan_is_brentry(vlan)) {
			/* Trying to change flags of non-existent bridge vlan */
			if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
				return -EINVAL;
			/* It was only kept for port vlans, now make it real */
			ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
					    vlan->vid);
			if (ret) {
				br_err(br, "failed insert local address into bridge forwarding table\n");
				return ret;
			}
			atomic_inc(&vlan->refcnt);
			vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
			vg->num_vlans++;
		}
		__vlan_add_flags(vlan, flags);
		return 0;
	}

	vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
	if (!vlan)
		return -ENOMEM;

	vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
	if (!vlan->stats) {
		kfree(vlan);
		return -ENOMEM;
	}
	vlan->vid = vid;
	vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
	vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
	vlan->br = br;
	if (flags & BRIDGE_VLAN_INFO_BRENTRY)
		atomic_set(&vlan->refcnt, 1);
	ret = __vlan_add(vlan, flags);
	if (ret) {
		free_percpu(vlan->stats);
		kfree(vlan);
	}

	return ret;
}


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/* Must be protected by RTNL.
 * Must be called with vid in range from 1 to 4094 inclusive.
 */



int br_vlan_delete(struct net_bridge *br, u16 vid)
{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_vlan *v;

	ASSERT_RTNL();

	vg = br_vlan_group(br);
	v = br_vlan_find(vg, vid);
	if (!v || !br_vlan_is_brentry(v))
		return -ENOENT;

	br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
	br_fdb_delete_by_port(br, NULL, vid, 0);

	vlan_tunnel_info_del(vg, v);

	return __vlan_del(v);
}


Contributors
PersonTokensPropCommitsCommitProp
Vlad Yasevich4647.92%228.57%


Nikolay Aleksandrov2930.21%228.57%


Roopa Prabhu1818.75%228.57%


Toshiaki Makita33.12%114.29%


Total96100.00%7100.00%






void br_vlan_flush(struct net_bridge *br)
{
	struct net_bridge_vlan_group *vg;

	ASSERT_RTNL();

	vg = br_vlan_group(br);
	__vlan_flush(vg);
	RCU_INIT_POINTER(br->vlgrp, NULL);
	synchronize_rcu();
	__vlan_group_free(vg);
}


Contributors
PersonTokensPropCommitsCommitProp
Nikolay Aleksandrov2961.70%266.67%


Vlad Yasevich1838.30%133.33%


Total47100.00%3100.00%






struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
{
	if (!vg)
		return NULL;

	return br_vlan_lookup(&vg->vlan_hash, vid);
}


Contributors
PersonTokensPropCommitsCommitProp
Toshiaki Makita1852.94%150.00%


Nikolay Aleksandrov1647.06%150.00%


Total34100.00%2100.00%



/* Must be protected by RTNL. */



static void recalculate_group_addr(struct net_bridge *br)
{
	if (br->group_addr_set)
		return;

	spin_lock_bh(&br->lock);
	if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
		/* Bridge Group Address */
		br->group_addr[5] = 0x00;
	} else { /* vlan_enabled && ETH_P_8021AD */
		/* Provider Bridge Group Address */
		br->group_addr[5] = 0x08;
	}
	spin_unlock_bh(&br->lock);
}


Contributors
PersonTokensPropCommitsCommitProp
Toshiaki Makita76100.00%1100.00%


Total76100.00%1100.00%



/* Must be protected by RTNL. */



void br_recalculate_fwd_mask(struct net_bridge *br)
{
	if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
		br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
	else /* vlan_enabled && ETH_P_8021AD */
		br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
					      ~(1u << br->group_addr[5]);
}


Contributors
PersonTokensPropCommitsCommitProp
Toshiaki Makita52100.00%1100.00%


Total52100.00%1100.00%






int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
{
	struct switchdev_attr attr = {
		.orig_dev = br->dev,
		.id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
		.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
		.u.vlan_filtering = val,
        };
	int err;

	if (br->vlan_enabled == val)
		return