![Roopa Prabhu](/assets/img/avatar_default.png)
This patch adds vlan and address to warning messages printed in the bridge fdb code for debuggability. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1156 lines
27 KiB
C
1156 lines
27 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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 "br_private.h"
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static struct kmem_cache *br_fdb_cache __read_mostly;
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static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
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const unsigned char *addr,
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__u16 vid);
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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);
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static u32 fdb_salt __read_mostly;
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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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get_random_bytes(&fdb_salt, sizeof(fdb_salt));
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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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/* 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 !fdb->is_static &&
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time_before_eq(fdb->updated + hold_time(br), jiffies);
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}
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static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
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{
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/* use 1 byte of OUI and 3 bytes of NIC */
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u32 key = get_unaligned((u32 *)(mac + 2));
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return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
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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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/* 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_del_external_learn(struct net_bridge_fdb_entry *f)
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{
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struct switchdev_obj_port_fdb fdb = {
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.obj = {
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.orig_dev = f->dst->dev,
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.id = SWITCHDEV_OBJ_ID_PORT_FDB,
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.flags = SWITCHDEV_F_DEFER,
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},
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.vid = f->vlan_id,
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};
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ether_addr_copy(fdb.addr, f->addr.addr);
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switchdev_port_obj_del(f->dst->dev, &fdb.obj);
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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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{
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if (f->is_static)
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fdb_del_hw_addr(br, f->addr.addr);
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if (f->added_by_external_learn)
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fdb_del_external_learn(f);
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hlist_del_rcu(&f->hlist);
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fdb_notify(br, f, RTM_DELNEIGH);
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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->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->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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f->added_by_user = 0;
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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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f->added_by_user = 0;
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return;
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}
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fdb_delete(br, f);
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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 hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
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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 = fdb_find(head, addr, vid);
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if (f && f->is_local && !f->added_by_user && 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 *br = p->br;
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struct net_bridge_vlan *v;
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int i;
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spin_lock_bh(&br->hash_lock);
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vg = nbp_vlan_group(p);
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/* Search all chains since old address/hash is unknown */
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for (i = 0; i < BR_HASH_SIZE; i++) {
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struct hlist_node *h;
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hlist_for_each(h, &br->hash[i]) {
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struct net_bridge_fdb_entry *f;
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f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
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if (f->dst == p && f->is_local && !f->added_by_user) {
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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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}
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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_get(br, br->dev->dev_addr, 0);
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if (f && f->is_local && !f->dst && !f->added_by_user)
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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_get(br, br->dev->dev_addr, v->vid);
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if (f && f->is_local && !f->dst && !f->added_by_user)
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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(unsigned long _data)
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{
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struct net_bridge *br = (struct net_bridge *)_data;
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unsigned long delay = hold_time(br);
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unsigned long next_timer = jiffies + br->ageing_time;
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int i;
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spin_lock(&br->hash_lock);
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for (i = 0; i < BR_HASH_SIZE; i++) {
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struct net_bridge_fdb_entry *f;
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struct hlist_node *n;
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hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
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unsigned long this_timer;
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if (f->is_static)
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continue;
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if (f->added_by_external_learn)
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continue;
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this_timer = f->updated + delay;
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if (time_before_eq(this_timer, jiffies))
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fdb_delete(br, f);
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else if (time_before(this_timer, next_timer))
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next_timer = this_timer;
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}
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}
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spin_unlock(&br->hash_lock);
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mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
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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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int i;
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spin_lock_bh(&br->hash_lock);
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for (i = 0; i < BR_HASH_SIZE; i++) {
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struct net_bridge_fdb_entry *f;
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struct hlist_node *n;
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hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
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if (!f->is_static)
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fdb_delete(br, f);
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}
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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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int i;
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spin_lock_bh(&br->hash_lock);
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for (i = 0; i < BR_HASH_SIZE; i++) {
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struct hlist_node *h, *g;
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hlist_for_each_safe(h, g, &br->hash[i]) {
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struct net_bridge_fdb_entry *f
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= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
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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 (f->is_static || (vid && f->vlan_id != vid))
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continue;
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if (f->is_local)
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fdb_delete_local(br, p, f);
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else
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fdb_delete(br, f);
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}
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}
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spin_unlock_bh(&br->hash_lock);
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}
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/* No locking or refcounting, assumes caller has rcu_read_lock */
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struct net_bridge_fdb_entry *__br_fdb_get(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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hlist_for_each_entry_rcu(fdb,
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&br->hash[br_mac_hash(addr, vid)], hlist) {
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if (ether_addr_equal(fdb->addr.addr, addr) &&
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fdb->vlan_id == vid) {
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if (unlikely(has_expired(br, fdb)))
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break;
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return fdb;
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}
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}
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return NULL;
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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_get(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 __fdb_entry *fe = buf;
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int i, num = 0;
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struct net_bridge_fdb_entry *f;
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memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
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rcu_read_lock();
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for (i = 0; i < BR_HASH_SIZE; i++) {
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hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
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if (num >= maxnum)
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goto out;
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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->addr.addr, ETH_ALEN);
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|
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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;
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fe->is_local = f->is_local;
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if (!f->is_static)
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fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
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++fe;
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++num;
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}
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}
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out:
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rcu_read_unlock();
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return num;
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}
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|
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static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
|
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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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hlist_for_each_entry(fdb, head, hlist) {
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if (ether_addr_equal(fdb->addr.addr, addr) &&
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fdb->vlan_id == vid)
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return fdb;
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}
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return NULL;
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}
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|
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static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
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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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hlist_for_each_entry_rcu(fdb, head, hlist) {
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if (ether_addr_equal(fdb->addr.addr, addr) &&
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fdb->vlan_id == vid)
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return fdb;
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}
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return NULL;
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}
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|
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static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
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struct net_bridge_port *source,
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const unsigned char *addr,
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__u16 vid,
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unsigned char is_local,
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unsigned char is_static)
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|
{
|
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struct net_bridge_fdb_entry *fdb;
|
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|
|
fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
|
|
if (fdb) {
|
|
memcpy(fdb->addr.addr, addr, ETH_ALEN);
|
|
fdb->dst = source;
|
|
fdb->vlan_id = vid;
|
|
fdb->is_local = is_local;
|
|
fdb->is_static = is_static;
|
|
fdb->added_by_user = 0;
|
|
fdb->added_by_external_learn = 0;
|
|
fdb->updated = fdb->used = jiffies;
|
|
hlist_add_head_rcu(&fdb->hlist, head);
|
|
}
|
|
return fdb;
|
|
}
|
|
|
|
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
if (!is_valid_ether_addr(addr))
|
|
return -EINVAL;
|
|
|
|
fdb = fdb_find(head, addr, vid);
|
|
if (fdb) {
|
|
/* it is okay to have multiple ports with same
|
|
* address, just use the first one.
|
|
*/
|
|
if (fdb->is_local)
|
|
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);
|
|
}
|
|
|
|
fdb = fdb_create(head, source, addr, vid, 1, 1);
|
|
if (!fdb)
|
|
return -ENOMEM;
|
|
|
|
fdb_add_hw_addr(br, addr);
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH);
|
|
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, bool added_by_user)
|
|
{
|
|
struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
|
|
struct net_bridge_fdb_entry *fdb;
|
|
bool fdb_modified = false;
|
|
|
|
/* some users want to always flood. */
|
|
if (hold_time(br) == 0)
|
|
return;
|
|
|
|
/* ignore packets unless we are using this port */
|
|
if (!(source->state == BR_STATE_LEARNING ||
|
|
source->state == BR_STATE_FORWARDING))
|
|
return;
|
|
|
|
fdb = fdb_find_rcu(head, addr, vid);
|
|
if (likely(fdb)) {
|
|
/* attempt to update an entry for a local interface */
|
|
if (unlikely(fdb->is_local)) {
|
|
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 {
|
|
/* fastpath: update of existing entry */
|
|
if (unlikely(source != fdb->dst)) {
|
|
fdb->dst = source;
|
|
fdb_modified = true;
|
|
}
|
|
fdb->updated = jiffies;
|
|
if (unlikely(added_by_user))
|
|
fdb->added_by_user = 1;
|
|
if (unlikely(fdb_modified))
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH);
|
|
}
|
|
} else {
|
|
spin_lock(&br->hash_lock);
|
|
if (likely(!fdb_find(head, addr, vid))) {
|
|
fdb = fdb_create(head, source, addr, vid, 0, 0);
|
|
if (fdb) {
|
|
if (unlikely(added_by_user))
|
|
fdb->added_by_user = 1;
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH);
|
|
}
|
|
}
|
|
/* 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 (fdb->is_local)
|
|
return NUD_PERMANENT;
|
|
else if (fdb->is_static)
|
|
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 = fdb->added_by_external_learn ? NTF_EXT_LEARNED : 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 (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->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->vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->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)
|
|
{
|
|
struct net *net = dev_net(br->dev);
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
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);
|
|
int err = 0;
|
|
int i;
|
|
|
|
if (!(dev->priv_flags & IFF_EBRIDGE))
|
|
goto out;
|
|
|
|
if (!filter_dev) {
|
|
err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < BR_HASH_SIZE; i++) {
|
|
struct net_bridge_fdb_entry *f;
|
|
|
|
hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
|
|
|
|
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)
|
|
goto out;
|
|
skip:
|
|
*idx += 1;
|
|
}
|
|
}
|
|
|
|
out:
|
|
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)
|
|
{
|
|
struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
|
|
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;
|
|
}
|
|
|
|
fdb = fdb_find(head, addr, vid);
|
|
if (fdb == NULL) {
|
|
if (!(flags & NLM_F_CREATE))
|
|
return -ENOENT;
|
|
|
|
fdb = fdb_create(head, source, addr, vid, 0, 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) {
|
|
fdb->is_local = 1;
|
|
if (!fdb->is_static) {
|
|
fdb->is_static = 1;
|
|
fdb_add_hw_addr(br, addr);
|
|
}
|
|
} else if (state & NUD_NOARP) {
|
|
fdb->is_local = 0;
|
|
if (!fdb->is_static) {
|
|
fdb->is_static = 1;
|
|
fdb_add_hw_addr(br, addr);
|
|
}
|
|
} else {
|
|
fdb->is_local = 0;
|
|
if (fdb->is_static) {
|
|
fdb->is_static = 0;
|
|
fdb_del_hw_addr(br, addr);
|
|
}
|
|
}
|
|
|
|
modified = true;
|
|
}
|
|
fdb->added_by_user = 1;
|
|
|
|
fdb->used = jiffies;
|
|
if (modified) {
|
|
fdb->updated = jiffies;
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH);
|
|
}
|
|
|
|
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;
|
|
}
|
|
local_bh_disable();
|
|
rcu_read_lock();
|
|
br_fdb_update(br, p, addr, vid, true);
|
|
rcu_read_unlock();
|
|
local_bh_enable();
|
|
} else {
|
|
spin_lock_bh(&br->hash_lock);
|
|
err = fdb_add_entry(br, p, addr, ndm->ndm_state,
|
|
nlh_flags, vid);
|
|
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 net_bridge_vlan_group *vg;
|
|
struct net_bridge_port *p = NULL;
|
|
struct net_bridge_vlan *v;
|
|
struct net_bridge *br = NULL;
|
|
int err = 0;
|
|
|
|
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(struct net_bridge *br, const u8 *addr,
|
|
u16 vid)
|
|
{
|
|
struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
fdb = fdb_find(head, addr, vid);
|
|
if (!fdb)
|
|
return -ENOENT;
|
|
|
|
fdb_delete(br, fdb);
|
|
return 0;
|
|
}
|
|
|
|
static int __br_fdb_delete_by_addr(struct net_bridge *br,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
int err;
|
|
|
|
spin_lock_bh(&br->hash_lock);
|
|
err = fdb_delete_by_addr(br, addr, vid);
|
|
spin_unlock_bh(&br->hash_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int fdb_delete_by_addr_and_port(struct net_bridge_port *p,
|
|
const u8 *addr, u16 vlan)
|
|
{
|
|
struct net_bridge *br = p->br;
|
|
struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
fdb = fdb_find(head, addr, vlan);
|
|
if (!fdb || fdb->dst != p)
|
|
return -ENOENT;
|
|
|
|
fdb_delete(br, fdb);
|
|
return 0;
|
|
}
|
|
|
|
static int __br_fdb_delete(struct net_bridge_port *p,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
int err;
|
|
|
|
spin_lock_bh(&p->br->hash_lock);
|
|
err = fdb_delete_by_addr_and_port(p, addr, vid);
|
|
spin_unlock_bh(&p->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 = NULL;
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if (dev->priv_flags & IFF_EBRIDGE)
|
|
err = __br_fdb_delete_by_addr(br, addr, vid);
|
|
else
|
|
err = __br_fdb_delete(p, addr, vid);
|
|
} else {
|
|
err = -ENOENT;
|
|
if (dev->priv_flags & IFF_EBRIDGE)
|
|
err = __br_fdb_delete_by_addr(br, addr, 0);
|
|
else
|
|
err &= __br_fdb_delete(p, addr, 0);
|
|
|
|
if (!vg || !vg->num_vlans)
|
|
goto out;
|
|
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
if (!br_vlan_should_use(v))
|
|
continue;
|
|
if (dev->priv_flags & IFF_EBRIDGE)
|
|
err = __br_fdb_delete_by_addr(br, addr, v->vid);
|
|
else
|
|
err &= __br_fdb_delete(p, addr, v->vid);
|
|
}
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb, *tmp;
|
|
int i;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for (i = 0; i < BR_HASH_SIZE; i++) {
|
|
hlist_for_each_entry(fdb, &br->hash[i], hlist) {
|
|
/* We only care for static entries */
|
|
if (!fdb->is_static)
|
|
continue;
|
|
|
|
err = dev_uc_add(p->dev, fdb->addr.addr);
|
|
if (err)
|
|
goto rollback;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
rollback:
|
|
for (i = 0; i < BR_HASH_SIZE; i++) {
|
|
hlist_for_each_entry(tmp, &br->hash[i], hlist) {
|
|
/* If we reached the fdb that failed, we can stop */
|
|
if (tmp == fdb)
|
|
break;
|
|
|
|
/* We only care for static entries */
|
|
if (!tmp->is_static)
|
|
continue;
|
|
|
|
dev_uc_del(p->dev, tmp->addr.addr);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
|
|
{
|
|
struct net_bridge_fdb_entry *fdb;
|
|
int i;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for (i = 0; i < BR_HASH_SIZE; i++) {
|
|
hlist_for_each_entry_rcu(fdb, &br->hash[i], hlist) {
|
|
/* We only care for static entries */
|
|
if (!fdb->is_static)
|
|
continue;
|
|
|
|
dev_uc_del(p->dev, fdb->addr.addr);
|
|
}
|
|
}
|
|
}
|
|
|
|
int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
|
|
const unsigned char *addr, u16 vid)
|
|
{
|
|
struct hlist_head *head;
|
|
struct net_bridge_fdb_entry *fdb;
|
|
int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
spin_lock_bh(&br->hash_lock);
|
|
|
|
head = &br->hash[br_mac_hash(addr, vid)];
|
|
fdb = fdb_find(head, addr, vid);
|
|
if (!fdb) {
|
|
fdb = fdb_create(head, p, addr, vid, 0, 0);
|
|
if (!fdb) {
|
|
err = -ENOMEM;
|
|
goto err_unlock;
|
|
}
|
|
fdb->added_by_external_learn = 1;
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH);
|
|
} else if (fdb->added_by_external_learn) {
|
|
/* Refresh entry */
|
|
fdb->updated = fdb->used = jiffies;
|
|
} else if (!fdb->added_by_user) {
|
|
/* Take over SW learned entry */
|
|
fdb->added_by_external_learn = 1;
|
|
fdb->updated = jiffies;
|
|
fdb_notify(br, fdb, RTM_NEWNEIGH);
|
|
}
|
|
|
|
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)
|
|
{
|
|
struct hlist_head *head;
|
|
struct net_bridge_fdb_entry *fdb;
|
|
int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
spin_lock_bh(&br->hash_lock);
|
|
|
|
head = &br->hash[br_mac_hash(addr, vid)];
|
|
fdb = fdb_find(head, addr, vid);
|
|
if (fdb && fdb->added_by_external_learn)
|
|
fdb_delete(br, fdb);
|
|
else
|
|
err = -ENOENT;
|
|
|
|
spin_unlock_bh(&br->hash_lock);
|
|
|
|
return err;
|
|
}
|