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![Vladimir Oltean](/assets/img/avatar_default.png)
Currently the bridge emits atomic switchdev notifications for dynamically learnt FDB entries. Monitoring these notifications works wonders for switchdev drivers that want to keep their hardware FDB in sync with the bridge's FDB. For example station A wants to talk to station B in the diagram below, and we are concerned with the behavior of the bridge on the DUT device: DUT +-------------------------------------+ | br0 | | +------+ +------+ +------+ +------+ | | | | | | | | | | | | | swp0 | | swp1 | | swp2 | | eth0 | | +-------------------------------------+ | | | Station A | | | | +--+------+--+ +--+------+--+ | | | | | | | | | | swp0 | | | | swp0 | | Another | +------+ | | +------+ | Another switch | br0 | | br0 | switch | +------+ | | +------+ | | | | | | | | | | | swp1 | | | | swp1 | | +--+------+--+ +--+------+--+ | Station B Interfaces swp0, swp1, swp2 are handled by a switchdev driver that has the following property: frames injected from its control interface bypass the internal address analyzer logic, and therefore, this hardware does not learn from the source address of packets transmitted by the network stack through it. So, since bridging between eth0 (where Station B is attached) and swp0 (where Station A is attached) is done in software, the switchdev hardware will never learn the source address of Station B. So the traffic towards that destination will be treated as unknown, i.e. flooded. This is where the bridge notifications come in handy. When br0 on the DUT sees frames with Station B's MAC address on eth0, the switchdev driver gets these notifications and can install a rule to send frames towards Station B's address that are incoming from swp0, swp1, swp2, only towards the control interface. This is all switchdev driver private business, which the notification makes possible. All is fine until someone unplugs Station B's cable and moves it to the other switch: DUT +-------------------------------------+ | br0 | | +------+ +------+ +------+ +------+ | | | | | | | | | | | | | swp0 | | swp1 | | swp2 | | eth0 | | +-------------------------------------+ | | | Station A | | | | +--+------+--+ +--+------+--+ | | | | | | | | | | swp0 | | | | swp0 | | Another | +------+ | | +------+ | Another switch | br0 | | br0 | switch | +------+ | | +------+ | | | | | | | | | | | swp1 | | | | swp1 | | +--+------+--+ +--+------+--+ | Station B Luckily for the use cases we care about, Station B is noisy enough that the DUT hears it (on swp1 this time). swp1 receives the frames and delivers them to the bridge, who enters the unlikely path in br_fdb_update of updating an existing entry. It moves the entry in the software bridge to swp1 and emits an addition notification towards that. As far as the switchdev driver is concerned, all that it needs to ensure is that traffic between Station A and Station B is not forever broken. If it does nothing, then the stale rule to send frames for Station B towards the control interface remains in place. But Station B is no longer reachable via the control interface, but via a port that can offload the bridge port learning attribute. It's just that the port is prevented from learning this address, since the rule overrides FDB updates. So the rule needs to go. The question is via what mechanism. It sure would be possible for this switchdev driver to keep track of all addresses which are sent to the control interface, and then also listen for bridge notifier events on its own ports, searching for the ones that have a MAC address which was previously sent to the control interface. But this is cumbersome and inefficient. Instead, with one small change, the bridge could notify of the address deletion from the old port, in a symmetrical manner with how it did for the insertion. Then the switchdev driver would not be required to monitor learn/forget events for its own ports. It could just delete the rule towards the control interface upon bridge entry migration. This would make hardware address learning be possible again. Then it would take a few more packets until the hardware and software FDB would be in sync again. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1304 lines
32 KiB
C
1304 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Forwarding database
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/rculist.h>
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#include <linux/spinlock.h>
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#include <linux/times.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/jhash.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/atomic.h>
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#include <asm/unaligned.h>
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#include <linux/if_vlan.h>
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#include <net/switchdev.h>
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#include <trace/events/bridge.h>
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#include "br_private.h"
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static const struct rhashtable_params br_fdb_rht_params = {
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.head_offset = offsetof(struct net_bridge_fdb_entry, rhnode),
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.key_offset = offsetof(struct net_bridge_fdb_entry, key),
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.key_len = sizeof(struct net_bridge_fdb_key),
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.automatic_shrinking = true,
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};
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static struct kmem_cache *br_fdb_cache __read_mostly;
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static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
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const unsigned char *addr, u16 vid);
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static void fdb_notify(struct net_bridge *br,
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const struct net_bridge_fdb_entry *, int, bool);
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int __init br_fdb_init(void)
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{
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br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
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sizeof(struct net_bridge_fdb_entry),
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0,
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SLAB_HWCACHE_ALIGN, NULL);
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if (!br_fdb_cache)
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return -ENOMEM;
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return 0;
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}
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void br_fdb_fini(void)
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{
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kmem_cache_destroy(br_fdb_cache);
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}
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int br_fdb_hash_init(struct net_bridge *br)
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{
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return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
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}
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void br_fdb_hash_fini(struct net_bridge *br)
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{
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rhashtable_destroy(&br->fdb_hash_tbl);
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}
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/* if topology_changing then use forward_delay (default 15 sec)
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* otherwise keep longer (default 5 minutes)
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*/
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static inline unsigned long hold_time(const struct net_bridge *br)
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{
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return br->topology_change ? br->forward_delay : br->ageing_time;
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}
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static inline int has_expired(const struct net_bridge *br,
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const struct net_bridge_fdb_entry *fdb)
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{
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return !test_bit(BR_FDB_STATIC, &fdb->flags) &&
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!test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) &&
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time_before_eq(fdb->updated + hold_time(br), jiffies);
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}
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static void fdb_rcu_free(struct rcu_head *head)
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{
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struct net_bridge_fdb_entry *ent
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= container_of(head, struct net_bridge_fdb_entry, rcu);
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kmem_cache_free(br_fdb_cache, ent);
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}
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static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
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const unsigned char *addr,
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__u16 vid)
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{
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struct net_bridge_fdb_key key;
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WARN_ON_ONCE(!rcu_read_lock_held());
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key.vlan_id = vid;
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memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
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return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
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}
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/* requires bridge hash_lock */
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static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
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const unsigned char *addr,
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__u16 vid)
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{
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struct net_bridge_fdb_entry *fdb;
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lockdep_assert_held_once(&br->hash_lock);
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rcu_read_lock();
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fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
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rcu_read_unlock();
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return fdb;
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}
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struct net_device *br_fdb_find_port(const struct net_device *br_dev,
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const unsigned char *addr,
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__u16 vid)
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{
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struct net_bridge_fdb_entry *f;
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struct net_device *dev = NULL;
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struct net_bridge *br;
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ASSERT_RTNL();
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if (!netif_is_bridge_master(br_dev))
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return NULL;
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br = netdev_priv(br_dev);
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rcu_read_lock();
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f = br_fdb_find_rcu(br, addr, vid);
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if (f && f->dst)
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dev = f->dst->dev;
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rcu_read_unlock();
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return dev;
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}
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EXPORT_SYMBOL_GPL(br_fdb_find_port);
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struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
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const unsigned char *addr,
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__u16 vid)
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{
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return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
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}
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/* When a static FDB entry is added, the mac address from the entry is
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* added to the bridge private HW address list and all required ports
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* are then updated with the new information.
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* Called under RTNL.
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*/
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static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
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{
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int err;
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struct net_bridge_port *p;
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ASSERT_RTNL();
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list_for_each_entry(p, &br->port_list, list) {
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if (!br_promisc_port(p)) {
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err = dev_uc_add(p->dev, addr);
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if (err)
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goto undo;
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}
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}
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return;
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undo:
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list_for_each_entry_continue_reverse(p, &br->port_list, list) {
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if (!br_promisc_port(p))
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dev_uc_del(p->dev, addr);
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}
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}
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/* When a static FDB entry is deleted, the HW address from that entry is
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* also removed from the bridge private HW address list and updates all
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* the ports with needed information.
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* Called under RTNL.
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*/
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static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
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{
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struct net_bridge_port *p;
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ASSERT_RTNL();
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list_for_each_entry(p, &br->port_list, list) {
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if (!br_promisc_port(p))
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dev_uc_del(p->dev, addr);
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}
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}
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static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
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bool swdev_notify)
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{
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trace_fdb_delete(br, f);
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if (test_bit(BR_FDB_STATIC, &f->flags))
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fdb_del_hw_addr(br, f->key.addr.addr);
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hlist_del_init_rcu(&f->fdb_node);
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rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
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br_fdb_rht_params);
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fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
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call_rcu(&f->rcu, fdb_rcu_free);
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}
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/* Delete a local entry if no other port had the same address. */
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static void fdb_delete_local(struct net_bridge *br,
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const struct net_bridge_port *p,
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struct net_bridge_fdb_entry *f)
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{
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const unsigned char *addr = f->key.addr.addr;
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struct net_bridge_vlan_group *vg;
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const struct net_bridge_vlan *v;
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struct net_bridge_port *op;
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u16 vid = f->key.vlan_id;
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/* Maybe another port has same hw addr? */
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list_for_each_entry(op, &br->port_list, list) {
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vg = nbp_vlan_group(op);
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if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
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(!vid || br_vlan_find(vg, vid))) {
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f->dst = op;
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clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
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return;
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}
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}
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vg = br_vlan_group(br);
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v = br_vlan_find(vg, vid);
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/* Maybe bridge device has same hw addr? */
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if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
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(!vid || (v && br_vlan_should_use(v)))) {
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f->dst = NULL;
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clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
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return;
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}
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fdb_delete(br, f, true);
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}
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void br_fdb_find_delete_local(struct net_bridge *br,
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const struct net_bridge_port *p,
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const unsigned char *addr, u16 vid)
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{
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struct net_bridge_fdb_entry *f;
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spin_lock_bh(&br->hash_lock);
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f = br_fdb_find(br, addr, vid);
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if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
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!test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p)
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fdb_delete_local(br, p, f);
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spin_unlock_bh(&br->hash_lock);
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}
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void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
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{
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struct net_bridge_vlan_group *vg;
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struct net_bridge_fdb_entry *f;
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struct net_bridge *br = p->br;
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struct net_bridge_vlan *v;
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spin_lock_bh(&br->hash_lock);
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vg = nbp_vlan_group(p);
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hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
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if (f->dst == p && test_bit(BR_FDB_LOCAL, &f->flags) &&
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!test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) {
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/* delete old one */
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fdb_delete_local(br, p, f);
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/* if this port has no vlan information
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* configured, we can safely be done at
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* this point.
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*/
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if (!vg || !vg->num_vlans)
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goto insert;
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}
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}
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insert:
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/* insert new address, may fail if invalid address or dup. */
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fdb_insert(br, p, newaddr, 0);
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if (!vg || !vg->num_vlans)
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goto done;
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/* Now add entries for every VLAN configured on the port.
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* This function runs under RTNL so the bitmap will not change
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* from under us.
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*/
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list_for_each_entry(v, &vg->vlan_list, vlist)
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fdb_insert(br, p, newaddr, v->vid);
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done:
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spin_unlock_bh(&br->hash_lock);
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}
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void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
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{
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struct net_bridge_vlan_group *vg;
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struct net_bridge_fdb_entry *f;
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struct net_bridge_vlan *v;
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spin_lock_bh(&br->hash_lock);
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/* If old entry was unassociated with any port, then delete it. */
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f = br_fdb_find(br, br->dev->dev_addr, 0);
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if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
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!f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
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fdb_delete_local(br, NULL, f);
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fdb_insert(br, NULL, newaddr, 0);
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vg = br_vlan_group(br);
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if (!vg || !vg->num_vlans)
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goto out;
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/* Now remove and add entries for every VLAN configured on the
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* bridge. This function runs under RTNL so the bitmap will not
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* change from under us.
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*/
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list_for_each_entry(v, &vg->vlan_list, vlist) {
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if (!br_vlan_should_use(v))
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continue;
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f = br_fdb_find(br, br->dev->dev_addr, v->vid);
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if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
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!f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
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fdb_delete_local(br, NULL, f);
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fdb_insert(br, NULL, newaddr, v->vid);
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}
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out:
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spin_unlock_bh(&br->hash_lock);
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}
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void br_fdb_cleanup(struct work_struct *work)
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{
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struct net_bridge *br = container_of(work, struct net_bridge,
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gc_work.work);
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struct net_bridge_fdb_entry *f = NULL;
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unsigned long delay = hold_time(br);
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unsigned long work_delay = delay;
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unsigned long now = jiffies;
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/* this part is tricky, in order to avoid blocking learning and
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* consequently forwarding, we rely on rcu to delete objects with
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* delayed freeing allowing us to continue traversing
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*/
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rcu_read_lock();
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hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
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unsigned long this_timer = f->updated + delay;
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if (test_bit(BR_FDB_STATIC, &f->flags) ||
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test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) {
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if (test_bit(BR_FDB_NOTIFY, &f->flags)) {
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if (time_after(this_timer, now))
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work_delay = min(work_delay,
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this_timer - now);
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else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE,
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&f->flags))
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fdb_notify(br, f, RTM_NEWNEIGH, false);
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}
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continue;
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}
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if (time_after(this_timer, now)) {
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work_delay = min(work_delay, this_timer - now);
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} else {
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spin_lock_bh(&br->hash_lock);
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if (!hlist_unhashed(&f->fdb_node))
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fdb_delete(br, f, true);
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spin_unlock_bh(&br->hash_lock);
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}
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}
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rcu_read_unlock();
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/* Cleanup minimum 10 milliseconds apart */
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work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
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mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
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}
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/* Completely flush all dynamic entries in forwarding database.*/
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void br_fdb_flush(struct net_bridge *br)
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{
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struct net_bridge_fdb_entry *f;
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struct hlist_node *tmp;
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spin_lock_bh(&br->hash_lock);
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hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
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if (!test_bit(BR_FDB_STATIC, &f->flags))
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fdb_delete(br, f, true);
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}
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spin_unlock_bh(&br->hash_lock);
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}
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/* Flush all entries referring to a specific port.
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* if do_all is set also flush static entries
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* if vid is set delete all entries that match the vlan_id
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*/
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void br_fdb_delete_by_port(struct net_bridge *br,
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const struct net_bridge_port *p,
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u16 vid,
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int do_all)
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{
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struct net_bridge_fdb_entry *f;
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struct hlist_node *tmp;
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spin_lock_bh(&br->hash_lock);
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hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
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if (f->dst != p)
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continue;
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if (!do_all)
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if (test_bit(BR_FDB_STATIC, &f->flags) ||
|
|
(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) &&
|
|
!test_bit(BR_FDB_OFFLOADED, &f->flags)) ||
|
|
(vid && f->key.vlan_id != vid))
|
|
continue;
|
|
|
|
if (test_bit(BR_FDB_LOCAL, &f->flags))
|
|
fdb_delete_local(br, p, f);
|
|
else
|
|
fdb_delete(br, f, true);
|
|
}
|
|
spin_unlock_bh(&br->hash_lock);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_ATM_LANE)
|
|
/* Interface used by ATM LANE hook to test
|
|
* if an addr is on some other bridge port */
|
|
int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
struct net_bridge_port *port;
|
|
int ret;
|
|
|
|
rcu_read_lock();
|
|
port = br_port_get_rcu(dev);
|
|
if (!port)
|
|
ret = 0;
|
|
else {
|
|
fdb = br_fdb_find_rcu(port->br, addr, 0);
|
|
ret = fdb && fdb->dst && fdb->dst->dev != dev &&
|
|
fdb->dst->state == BR_STATE_FORWARDING;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_ATM_LANE */
|
|
|
|
/*
|
|
* Fill buffer with forwarding table records in
|
|
* the API format.
|
|
*/
|
|
int br_fdb_fillbuf(struct net_bridge *br, void *buf,
|
|
unsigned long maxnum, unsigned long skip)
|
|
{
|
|
struct net_bridge_fdb_entry *f;
|
|
struct __fdb_entry *fe = buf;
|
|
int num = 0;
|
|
|
|
memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
|
|
if (num >= maxnum)
|
|
break;
|
|
|
|
if (has_expired(br, f))
|
|
continue;
|
|
|
|
/* ignore pseudo entry for local MAC address */
|
|
if (!f->dst)
|
|
continue;
|
|
|
|
if (skip) {
|
|
--skip;
|
|
continue;
|
|
}
|
|
|
|
/* convert from internal format to API */
|
|
memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
|
|
|
|
/* due to ABI compat need to split into hi/lo */
|
|
fe->port_no = f->dst->port_no;
|
|
fe->port_hi = f->dst->port_no >> 8;
|
|
|
|
fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags);
|
|
if (!test_bit(BR_FDB_STATIC, &f->flags))
|
|
fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
|
|
++fe;
|
|
++num;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return num;
|
|
}
|
|
|
|
static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
|
|
struct net_bridge_port *source,
|
|
const unsigned char *addr,
|
|
__u16 vid,
|
|
unsigned long flags)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
|
|
if (fdb) {
|
|
memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
|
|
fdb->dst = source;
|
|
fdb->key.vlan_id = vid;
|
|
fdb->flags = flags;
|
|
fdb->updated = fdb->used = jiffies;
|
|
if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
|
|
&fdb->rhnode,
|
|
br_fdb_rht_params)) {
|
|
kmem_cache_free(br_fdb_cache, fdb);
|
|
fdb = NULL;
|
|
} else {
|
|
hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
|
|
}
|
|
}
|
|
return fdb;
|
|
}
|
|
|
|
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
if (!is_valid_ether_addr(addr))
|
|
return -EINVAL;
|
|
|
|
fdb = br_fdb_find(br, addr, vid);
|
|
if (fdb) {
|
|
/* it is okay to have multiple ports with same
|
|
* address, just use the first one.
|
|
*/
|
|
if (test_bit(BR_FDB_LOCAL, &fdb->flags))
|
|
return 0;
|
|
br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
|
|
source ? source->dev->name : br->dev->name, addr, vid);
|
|
fdb_delete(br, fdb, true);
|
|
}
|
|
|
|
fdb = fdb_create(br, source, addr, vid,
|
|
BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC));
|
|
if (!fdb)
|
|
return -ENOMEM;
|
|
|
|
fdb_add_hw_addr(br, addr);
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
|
|
return 0;
|
|
}
|
|
|
|
/* Add entry for local address of interface */
|
|
int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock_bh(&br->hash_lock);
|
|
ret = fdb_insert(br, source, addr, vid);
|
|
spin_unlock_bh(&br->hash_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* returns true if the fdb was modified */
|
|
static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb)
|
|
{
|
|
return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) &&
|
|
test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags));
|
|
}
|
|
|
|
void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
|
|
const unsigned char *addr, u16 vid, unsigned long flags)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
/* some users want to always flood. */
|
|
if (hold_time(br) == 0)
|
|
return;
|
|
|
|
fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
|
|
if (likely(fdb)) {
|
|
/* attempt to update an entry for a local interface */
|
|
if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) {
|
|
if (net_ratelimit())
|
|
br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
|
|
source->dev->name, addr, vid);
|
|
} else {
|
|
unsigned long now = jiffies;
|
|
bool fdb_modified = false;
|
|
|
|
if (now != fdb->updated) {
|
|
fdb->updated = now;
|
|
fdb_modified = __fdb_mark_active(fdb);
|
|
}
|
|
|
|
/* fastpath: update of existing entry */
|
|
if (unlikely(source != fdb->dst &&
|
|
!test_bit(BR_FDB_STICKY, &fdb->flags))) {
|
|
br_switchdev_fdb_notify(fdb, RTM_DELNEIGH);
|
|
fdb->dst = source;
|
|
fdb_modified = true;
|
|
/* Take over HW learned entry */
|
|
if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN,
|
|
&fdb->flags)))
|
|
clear_bit(BR_FDB_ADDED_BY_EXT_LEARN,
|
|
&fdb->flags);
|
|
}
|
|
|
|
if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags)))
|
|
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
|
|
if (unlikely(fdb_modified)) {
|
|
trace_br_fdb_update(br, source, addr, vid, flags);
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
|
|
}
|
|
}
|
|
} else {
|
|
spin_lock(&br->hash_lock);
|
|
fdb = fdb_create(br, source, addr, vid, flags);
|
|
if (fdb) {
|
|
trace_br_fdb_update(br, source, addr, vid, flags);
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
|
|
}
|
|
/* else we lose race and someone else inserts
|
|
* it first, don't bother updating
|
|
*/
|
|
spin_unlock(&br->hash_lock);
|
|
}
|
|
}
|
|
|
|
static int fdb_to_nud(const struct net_bridge *br,
|
|
const struct net_bridge_fdb_entry *fdb)
|
|
{
|
|
if (test_bit(BR_FDB_LOCAL, &fdb->flags))
|
|
return NUD_PERMANENT;
|
|
else if (test_bit(BR_FDB_STATIC, &fdb->flags))
|
|
return NUD_NOARP;
|
|
else if (has_expired(br, fdb))
|
|
return NUD_STALE;
|
|
else
|
|
return NUD_REACHABLE;
|
|
}
|
|
|
|
static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
|
|
const struct net_bridge_fdb_entry *fdb,
|
|
u32 portid, u32 seq, int type, unsigned int flags)
|
|
{
|
|
unsigned long now = jiffies;
|
|
struct nda_cacheinfo ci;
|
|
struct nlmsghdr *nlh;
|
|
struct ndmsg *ndm;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
ndm = nlmsg_data(nlh);
|
|
ndm->ndm_family = AF_BRIDGE;
|
|
ndm->ndm_pad1 = 0;
|
|
ndm->ndm_pad2 = 0;
|
|
ndm->ndm_flags = 0;
|
|
ndm->ndm_type = 0;
|
|
ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
|
|
ndm->ndm_state = fdb_to_nud(br, fdb);
|
|
|
|
if (test_bit(BR_FDB_OFFLOADED, &fdb->flags))
|
|
ndm->ndm_flags |= NTF_OFFLOADED;
|
|
if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
|
|
ndm->ndm_flags |= NTF_EXT_LEARNED;
|
|
if (test_bit(BR_FDB_STICKY, &fdb->flags))
|
|
ndm->ndm_flags |= NTF_STICKY;
|
|
|
|
if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
|
|
goto nla_put_failure;
|
|
if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
|
|
goto nla_put_failure;
|
|
ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
|
|
ci.ndm_confirmed = 0;
|
|
ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
|
|
ci.ndm_refcnt = 0;
|
|
if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
|
|
goto nla_put_failure;
|
|
|
|
if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
|
|
&fdb->key.vlan_id))
|
|
goto nla_put_failure;
|
|
|
|
if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) {
|
|
struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS);
|
|
u8 notify_bits = FDB_NOTIFY_BIT;
|
|
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
|
|
notify_bits |= FDB_NOTIFY_INACTIVE_BIT;
|
|
|
|
if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) {
|
|
nla_nest_cancel(skb, nest);
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static inline size_t fdb_nlmsg_size(void)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct ndmsg))
|
|
+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
|
|
+ nla_total_size(sizeof(u32)) /* NDA_MASTER */
|
|
+ nla_total_size(sizeof(u16)) /* NDA_VLAN */
|
|
+ nla_total_size(sizeof(struct nda_cacheinfo))
|
|
+ nla_total_size(0) /* NDA_FDB_EXT_ATTRS */
|
|
+ nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */
|
|
}
|
|
|
|
static void fdb_notify(struct net_bridge *br,
|
|
const struct net_bridge_fdb_entry *fdb, int type,
|
|
bool swdev_notify)
|
|
{
|
|
struct net *net = dev_net(br->dev);
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
if (swdev_notify)
|
|
br_switchdev_fdb_notify(fdb, type);
|
|
|
|
skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
|
|
return;
|
|
errout:
|
|
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
|
|
}
|
|
|
|
/* Dump information about entries, in response to GETNEIGH */
|
|
int br_fdb_dump(struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
struct net_device *dev,
|
|
struct net_device *filter_dev,
|
|
int *idx)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
struct net_bridge_fdb_entry *f;
|
|
int err = 0;
|
|
|
|
if (!(dev->priv_flags & IFF_EBRIDGE))
|
|
return err;
|
|
|
|
if (!filter_dev) {
|
|
err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
|
|
if (*idx < cb->args[2])
|
|
goto skip;
|
|
if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
|
|
if (filter_dev != dev)
|
|
goto skip;
|
|
/* !f->dst is a special case for bridge
|
|
* It means the MAC belongs to the bridge
|
|
* Therefore need a little more filtering
|
|
* we only want to dump the !f->dst case
|
|
*/
|
|
if (f->dst)
|
|
goto skip;
|
|
}
|
|
if (!filter_dev && f->dst)
|
|
goto skip;
|
|
|
|
err = fdb_fill_info(skb, br, f,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
RTM_NEWNEIGH,
|
|
NLM_F_MULTI);
|
|
if (err < 0)
|
|
break;
|
|
skip:
|
|
*idx += 1;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
int br_fdb_get(struct sk_buff *skb,
|
|
struct nlattr *tb[],
|
|
struct net_device *dev,
|
|
const unsigned char *addr,
|
|
u16 vid, u32 portid, u32 seq,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
struct net_bridge_fdb_entry *f;
|
|
int err = 0;
|
|
|
|
rcu_read_lock();
|
|
f = br_fdb_find_rcu(br, addr, vid);
|
|
if (!f) {
|
|
NL_SET_ERR_MSG(extack, "Fdb entry not found");
|
|
err = -ENOENT;
|
|
goto errout;
|
|
}
|
|
|
|
err = fdb_fill_info(skb, br, f, portid, seq,
|
|
RTM_NEWNEIGH, 0);
|
|
errout:
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
/* returns true if the fdb is modified */
|
|
static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify)
|
|
{
|
|
bool modified = false;
|
|
|
|
/* allow to mark an entry as inactive, usually done on creation */
|
|
if ((notify & FDB_NOTIFY_INACTIVE_BIT) &&
|
|
!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
|
|
modified = true;
|
|
|
|
if ((notify & FDB_NOTIFY_BIT) &&
|
|
!test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) {
|
|
/* enabled activity tracking */
|
|
modified = true;
|
|
} else if (!(notify & FDB_NOTIFY_BIT) &&
|
|
test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) {
|
|
/* disabled activity tracking, clear notify state */
|
|
clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags);
|
|
modified = true;
|
|
}
|
|
|
|
return modified;
|
|
}
|
|
|
|
/* Update (create or replace) forwarding database entry */
|
|
static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
|
|
const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid,
|
|
struct nlattr *nfea_tb[])
|
|
{
|
|
bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY);
|
|
bool refresh = !nfea_tb[NFEA_DONT_REFRESH];
|
|
struct net_bridge_fdb_entry *fdb;
|
|
u16 state = ndm->ndm_state;
|
|
bool modified = false;
|
|
u8 notify = 0;
|
|
|
|
/* If the port cannot learn allow only local and static entries */
|
|
if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
|
|
!(source->state == BR_STATE_LEARNING ||
|
|
source->state == BR_STATE_FORWARDING))
|
|
return -EPERM;
|
|
|
|
if (!source && !(state & NUD_PERMANENT)) {
|
|
pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
|
|
br->dev->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (is_sticky && (state & NUD_PERMANENT))
|
|
return -EINVAL;
|
|
|
|
if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) {
|
|
notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]);
|
|
if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) ||
|
|
(notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT)
|
|
return -EINVAL;
|
|
}
|
|
|
|
fdb = br_fdb_find(br, addr, vid);
|
|
if (fdb == NULL) {
|
|
if (!(flags & NLM_F_CREATE))
|
|
return -ENOENT;
|
|
|
|
fdb = fdb_create(br, source, addr, vid, 0);
|
|
if (!fdb)
|
|
return -ENOMEM;
|
|
|
|
modified = true;
|
|
} else {
|
|
if (flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
|
|
if (fdb->dst != source) {
|
|
fdb->dst = source;
|
|
modified = true;
|
|
}
|
|
}
|
|
|
|
if (fdb_to_nud(br, fdb) != state) {
|
|
if (state & NUD_PERMANENT) {
|
|
set_bit(BR_FDB_LOCAL, &fdb->flags);
|
|
if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
|
|
fdb_add_hw_addr(br, addr);
|
|
} else if (state & NUD_NOARP) {
|
|
clear_bit(BR_FDB_LOCAL, &fdb->flags);
|
|
if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
|
|
fdb_add_hw_addr(br, addr);
|
|
} else {
|
|
clear_bit(BR_FDB_LOCAL, &fdb->flags);
|
|
if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags))
|
|
fdb_del_hw_addr(br, addr);
|
|
}
|
|
|
|
modified = true;
|
|
}
|
|
|
|
if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) {
|
|
change_bit(BR_FDB_STICKY, &fdb->flags);
|
|
modified = true;
|
|
}
|
|
|
|
if (fdb_handle_notify(fdb, notify))
|
|
modified = true;
|
|
|
|
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
|
|
|
|
fdb->used = jiffies;
|
|
if (modified) {
|
|
if (refresh)
|
|
fdb->updated = jiffies;
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
|
|
struct net_bridge_port *p, const unsigned char *addr,
|
|
u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[])
|
|
{
|
|
int err = 0;
|
|
|
|
if (ndm->ndm_flags & NTF_USE) {
|
|
if (!p) {
|
|
pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
|
|
br->dev->name);
|
|
return -EINVAL;
|
|
}
|
|
if (!nbp_state_should_learn(p))
|
|
return 0;
|
|
|
|
local_bh_disable();
|
|
rcu_read_lock();
|
|
br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER));
|
|
rcu_read_unlock();
|
|
local_bh_enable();
|
|
} else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
|
|
err = br_fdb_external_learn_add(br, p, addr, vid, true);
|
|
} else {
|
|
spin_lock_bh(&br->hash_lock);
|
|
err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
|
|
spin_unlock_bh(&br->hash_lock);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
|
|
[NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 },
|
|
[NFEA_DONT_REFRESH] = { .type = NLA_FLAG },
|
|
};
|
|
|
|
/* Add new permanent fdb entry with RTM_NEWNEIGH */
|
|
int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
|
|
struct net_device *dev,
|
|
const unsigned char *addr, u16 vid, u16 nlh_flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *nfea_tb[NFEA_MAX + 1], *attr;
|
|
struct net_bridge_vlan_group *vg;
|
|
struct net_bridge_port *p = NULL;
|
|
struct net_bridge_vlan *v;
|
|
struct net_bridge *br = NULL;
|
|
int err = 0;
|
|
|
|
trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
|
|
|
|
if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
|
|
pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (is_zero_ether_addr(addr)) {
|
|
pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev->priv_flags & IFF_EBRIDGE) {
|
|
br = netdev_priv(dev);
|
|
vg = br_vlan_group(br);
|
|
} else {
|
|
p = br_port_get_rtnl(dev);
|
|
if (!p) {
|
|
pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
|
|
dev->name);
|
|
return -EINVAL;
|
|
}
|
|
br = p->br;
|
|
vg = nbp_vlan_group(p);
|
|
}
|
|
|
|
if (tb[NDA_FDB_EXT_ATTRS]) {
|
|
attr = tb[NDA_FDB_EXT_ATTRS];
|
|
err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
|
|
br_nda_fdb_pol, extack);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
|
|
}
|
|
|
|
if (vid) {
|
|
v = br_vlan_find(vg, vid);
|
|
if (!v || !br_vlan_should_use(v)) {
|
|
pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* VID was specified, so use it. */
|
|
err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb);
|
|
} else {
|
|
err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb);
|
|
if (err || !vg || !vg->num_vlans)
|
|
goto out;
|
|
|
|
/* We have vlans configured on this port and user didn't
|
|
* specify a VLAN. To be nice, add/update entry for every
|
|
* vlan on this port.
|
|
*/
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
if (!br_vlan_should_use(v))
|
|
continue;
|
|
err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid,
|
|
nfea_tb);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int fdb_delete_by_addr_and_port(struct net_bridge *br,
|
|
const struct net_bridge_port *p,
|
|
const u8 *addr, u16 vlan)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
fdb = br_fdb_find(br, addr, vlan);
|
|
if (!fdb || fdb->dst != p)
|
|
return -ENOENT;
|
|
|
|
fdb_delete(br, fdb, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __br_fdb_delete(struct net_bridge *br,
|
|
const struct net_bridge_port *p,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
int err;
|
|
|
|
spin_lock_bh(&br->hash_lock);
|
|
err = fdb_delete_by_addr_and_port(br, p, addr, vid);
|
|
spin_unlock_bh(&br->hash_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Remove neighbor entry with RTM_DELNEIGH */
|
|
int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
|
|
struct net_device *dev,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
struct net_bridge_vlan_group *vg;
|
|
struct net_bridge_port *p = NULL;
|
|
struct net_bridge_vlan *v;
|
|
struct net_bridge *br;
|
|
int err;
|
|
|
|
if (dev->priv_flags & IFF_EBRIDGE) {
|
|
br = netdev_priv(dev);
|
|
vg = br_vlan_group(br);
|
|
} else {
|
|
p = br_port_get_rtnl(dev);
|
|
if (!p) {
|
|
pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
|
|
dev->name);
|
|
return -EINVAL;
|
|
}
|
|
vg = nbp_vlan_group(p);
|
|
br = p->br;
|
|
}
|
|
|
|
if (vid) {
|
|
v = br_vlan_find(vg, vid);
|
|
if (!v) {
|
|
pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = __br_fdb_delete(br, p, addr, vid);
|
|
} else {
|
|
err = -ENOENT;
|
|
err &= __br_fdb_delete(br, p, addr, 0);
|
|
if (!vg || !vg->num_vlans)
|
|
return err;
|
|
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
if (!br_vlan_should_use(v))
|
|
continue;
|
|
err &= __br_fdb_delete(br, p, addr, v->vid);
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
|
|
{
|
|
struct net_bridge_fdb_entry *f, *tmp;
|
|
int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* the key here is that static entries change only under rtnl */
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
|
|
/* We only care for static entries */
|
|
if (!test_bit(BR_FDB_STATIC, &f->flags))
|
|
continue;
|
|
err = dev_uc_add(p->dev, f->key.addr.addr);
|
|
if (err)
|
|
goto rollback;
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
|
|
rollback:
|
|
hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
|
|
/* We only care for static entries */
|
|
if (!test_bit(BR_FDB_STATIC, &tmp->flags))
|
|
continue;
|
|
if (tmp == f)
|
|
break;
|
|
dev_uc_del(p->dev, tmp->key.addr.addr);
|
|
}
|
|
|
|
goto done;
|
|
}
|
|
|
|
void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
|
|
{
|
|
struct net_bridge_fdb_entry *f;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
|
|
/* We only care for static entries */
|
|
if (!test_bit(BR_FDB_STATIC, &f->flags))
|
|
continue;
|
|
|
|
dev_uc_del(p->dev, f->key.addr.addr);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
|
|
const unsigned char *addr, u16 vid,
|
|
bool swdev_notify)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
bool modified = false;
|
|
int err = 0;
|
|
|
|
trace_br_fdb_external_learn_add(br, p, addr, vid);
|
|
|
|
spin_lock_bh(&br->hash_lock);
|
|
|
|
fdb = br_fdb_find(br, addr, vid);
|
|
if (!fdb) {
|
|
unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
|
|
|
|
if (swdev_notify)
|
|
flags |= BIT(BR_FDB_ADDED_BY_USER);
|
|
fdb = fdb_create(br, p, addr, vid, flags);
|
|
if (!fdb) {
|
|
err = -ENOMEM;
|
|
goto err_unlock;
|
|
}
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
|
|
} else {
|
|
fdb->updated = jiffies;
|
|
|
|
if (fdb->dst != p) {
|
|
fdb->dst = p;
|
|
modified = true;
|
|
}
|
|
|
|
if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) {
|
|
/* Refresh entry */
|
|
fdb->used = jiffies;
|
|
} else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) {
|
|
/* Take over SW learned entry */
|
|
set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
|
|
modified = true;
|
|
}
|
|
|
|
if (swdev_notify)
|
|
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
|
|
|
|
if (modified)
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
|
|
}
|
|
|
|
err_unlock:
|
|
spin_unlock_bh(&br->hash_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
|
|
const unsigned char *addr, u16 vid,
|
|
bool swdev_notify)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
int err = 0;
|
|
|
|
spin_lock_bh(&br->hash_lock);
|
|
|
|
fdb = br_fdb_find(br, addr, vid);
|
|
if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
|
|
fdb_delete(br, fdb, swdev_notify);
|
|
else
|
|
err = -ENOENT;
|
|
|
|
spin_unlock_bh(&br->hash_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
|
|
const unsigned char *addr, u16 vid, bool offloaded)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
spin_lock_bh(&br->hash_lock);
|
|
|
|
fdb = br_fdb_find(br, addr, vid);
|
|
if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags))
|
|
change_bit(BR_FDB_OFFLOADED, &fdb->flags);
|
|
|
|
spin_unlock_bh(&br->hash_lock);
|
|
}
|
|
|
|
void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
|
|
{
|
|
struct net_bridge_fdb_entry *f;
|
|
struct net_bridge_port *p;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
p = br_port_get_rtnl(dev);
|
|
if (!p)
|
|
return;
|
|
|
|
spin_lock_bh(&p->br->hash_lock);
|
|
hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
|
|
if (f->dst == p && f->key.vlan_id == vid)
|
|
clear_bit(BR_FDB_OFFLOADED, &f->flags);
|
|
}
|
|
spin_unlock_bh(&p->br->hash_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_fdb_clear_offload);
|