![Nikolay Aleksandrov](/assets/img/avatar_default.png)
When commit df1c0b8468
("[BRIDGE]: Packets leaking out of
disabled/blocked ports.") introduced the port state tests in
br_fdb_update() it was to avoid learning/refreshing from STP BPDUs, it was
also used to avoid learning/refreshing from user-space with NTF_USE. Those
two tests are done for every packet entering the bridge if it's learning,
but for the fast-path we already have them checked in br_handle_frame() and
is unnecessary to do it again. Thus push the checks to the unlikely cases
and drop them from br_fdb_update(), the new nbp_state_should_learn() helper
is used to determine if the port state allows br_fdb_update() to be called.
The two places which need to do it manually are:
- user-space add call with NTF_USE set
- link-local packet learning done in __br_handle_local_finish()
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1209 lines
30 KiB
C
1209 lines
30 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;
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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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continue;
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this_timer = f->updated + delay;
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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) ||
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(vid && f->key.vlan_id != vid))
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continue;
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if (test_bit(BR_FDB_LOCAL, &f->flags))
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fdb_delete_local(br, p, f);
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else
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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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#if IS_ENABLED(CONFIG_ATM_LANE)
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/* Interface used by ATM LANE hook to test
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* if an addr is on some other bridge port */
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int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
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{
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struct net_bridge_fdb_entry *fdb;
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struct net_bridge_port *port;
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int ret;
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rcu_read_lock();
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port = br_port_get_rcu(dev);
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if (!port)
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ret = 0;
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else {
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fdb = br_fdb_find_rcu(port->br, addr, 0);
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ret = fdb && fdb->dst && fdb->dst->dev != dev &&
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fdb->dst->state == BR_STATE_FORWARDING;
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}
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rcu_read_unlock();
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return ret;
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}
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#endif /* CONFIG_ATM_LANE */
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/*
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* Fill buffer with forwarding table records in
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* the API format.
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*/
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int br_fdb_fillbuf(struct net_bridge *br, void *buf,
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unsigned long maxnum, unsigned long skip)
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{
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struct net_bridge_fdb_entry *f;
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struct __fdb_entry *fe = buf;
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int num = 0;
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memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
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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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if (num >= maxnum)
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break;
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if (has_expired(br, f))
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continue;
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/* ignore pseudo entry for local MAC address */
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if (!f->dst)
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continue;
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if (skip) {
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--skip;
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continue;
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}
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/* convert from internal format to API */
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memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
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/* due to ABI compat need to split into hi/lo */
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fe->port_no = f->dst->port_no;
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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;
|
|
}
|
|
|
|
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;
|
|
bool fdb_modified = false;
|
|
|
|
/* 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;
|
|
|
|
/* fastpath: update of existing entry */
|
|
if (unlikely(source != fdb->dst &&
|
|
!test_bit(BR_FDB_STICKY, &fdb->flags))) {
|
|
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 (now != fdb->updated)
|
|
fdb->updated = now;
|
|
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;
|
|
|
|
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));
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* Update (create or replace) forwarding database entry */
|
|
static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
|
|
const u8 *addr, u16 state, u16 flags, u16 vid,
|
|
u8 ndm_flags)
|
|
{
|
|
bool is_sticky = !!(ndm_flags & NTF_STICKY);
|
|
struct net_bridge_fdb_entry *fdb;
|
|
bool modified = false;
|
|
|
|
/* 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;
|
|
|
|
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;
|
|
}
|
|
|
|
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
|
|
|
|
fdb->used = jiffies;
|
|
if (modified) {
|
|
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)
|
|
{
|
|
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->ndm_state,
|
|
nlh_flags, vid, ndm->ndm_flags);
|
|
spin_unlock_bh(&br->hash_lock);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* 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 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 (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);
|
|
} else {
|
|
err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
|
|
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);
|
|
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);
|