696 lines
16 KiB
C
696 lines
16 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 <asm/atomic.h>
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#include <asm/unaligned.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 int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
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const unsigned char *addr);
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static void fdb_notify(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)
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{
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/* use 1 byte of OUI cnd 3 bytes of NIC */
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u32 key = get_unaligned((u32 *)(mac + 2));
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return jhash_1word(key, 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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static inline void fdb_delete(struct net_bridge_fdb_entry *f)
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{
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fdb_notify(f, RTM_DELNEIGH);
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hlist_del_rcu(&f->hlist);
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call_rcu(&f->rcu, fdb_rcu_free);
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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 *br = p->br;
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int i;
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spin_lock_bh(&br->hash_lock);
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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) {
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/* maybe another port has same hw addr? */
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struct net_bridge_port *op;
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list_for_each_entry(op, &br->port_list, list) {
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if (op != p &&
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!compare_ether_addr(op->dev->dev_addr,
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f->addr.addr)) {
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f->dst = op;
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goto insert;
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}
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}
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/* delete old one */
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fdb_delete(f);
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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);
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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_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 *h, *n;
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hlist_for_each_entry_safe(f, h, 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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this_timer = f->updated + delay;
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if (time_before_eq(this_timer, jiffies))
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fdb_delete(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_bh(&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 *h, *n;
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hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
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if (!f->is_static)
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fdb_delete(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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*/
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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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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 (f->is_static && !do_all)
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continue;
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/*
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* if multiple ports all have the same device address
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* then when one port is deleted, assign
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* the local entry to other port
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*/
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if (f->is_local) {
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struct net_bridge_port *op;
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list_for_each_entry(op, &br->port_list, list) {
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if (op != p &&
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!compare_ether_addr(op->dev->dev_addr,
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f->addr.addr)) {
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f->dst = op;
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goto skip_delete;
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}
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}
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}
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fdb_delete(f);
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skip_delete: ;
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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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{
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struct hlist_node *h;
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struct net_bridge_fdb_entry *fdb;
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hlist_for_each_entry_rcu(fdb, h, &br->hash[br_mac_hash(addr)], hlist) {
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if (!compare_ether_addr(fdb->addr.addr, addr)) {
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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 defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
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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);
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ret = fdb && 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 hlist_node *h;
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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, h, &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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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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/* 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_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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static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
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const unsigned char *addr)
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{
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struct hlist_node *h;
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struct net_bridge_fdb_entry *fdb;
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hlist_for_each_entry(fdb, h, head, hlist) {
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if (!compare_ether_addr(fdb->addr.addr, addr))
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return fdb;
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}
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return NULL;
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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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{
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struct hlist_node *h;
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struct net_bridge_fdb_entry *fdb;
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hlist_for_each_entry_rcu(fdb, h, head, hlist) {
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if (!compare_ether_addr(fdb->addr.addr, addr))
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return fdb;
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}
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return NULL;
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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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{
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struct net_bridge_fdb_entry *fdb;
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fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
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if (fdb) {
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memcpy(fdb->addr.addr, addr, ETH_ALEN);
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fdb->dst = source;
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fdb->is_local = 0;
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fdb->is_static = 0;
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fdb->updated = fdb->used = jiffies;
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hlist_add_head_rcu(&fdb->hlist, head);
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fdb_notify(fdb, RTM_NEWNEIGH);
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}
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return fdb;
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}
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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)
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{
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struct hlist_head *head = &br->hash[br_mac_hash(addr)];
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struct net_bridge_fdb_entry *fdb;
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if (!is_valid_ether_addr(addr))
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return -EINVAL;
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fdb = fdb_find(head, addr);
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if (fdb) {
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/* it is okay to have multiple ports with same
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* address, just use the first one.
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*/
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if (fdb->is_local)
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return 0;
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br_warn(br, "adding interface %s with same address "
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"as a received packet\n",
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source->dev->name);
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fdb_delete(fdb);
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}
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fdb = fdb_create(head, source, addr);
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if (!fdb)
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return -ENOMEM;
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fdb->is_local = fdb->is_static = 1;
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return 0;
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}
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/* Add entry for local address of interface */
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int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
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const unsigned char *addr)
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{
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int ret;
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spin_lock_bh(&br->hash_lock);
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ret = fdb_insert(br, source, addr);
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spin_unlock_bh(&br->hash_lock);
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return ret;
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}
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void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
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const unsigned char *addr)
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{
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struct hlist_head *head = &br->hash[br_mac_hash(addr)];
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struct net_bridge_fdb_entry *fdb;
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/* some users want to always flood. */
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if (hold_time(br) == 0)
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return;
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/* ignore packets unless we are using this port */
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if (!(source->state == BR_STATE_LEARNING ||
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source->state == BR_STATE_FORWARDING))
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return;
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fdb = fdb_find_rcu(head, addr);
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if (likely(fdb)) {
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/* attempt to update an entry for a local interface */
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if (unlikely(fdb->is_local)) {
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if (net_ratelimit())
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br_warn(br, "received packet on %s with "
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"own address as source address\n",
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source->dev->name);
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} else {
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/* fastpath: update of existing entry */
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fdb->dst = source;
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fdb->updated = jiffies;
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}
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} else {
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spin_lock(&br->hash_lock);
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if (likely(!fdb_find(head, addr)))
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fdb_create(head, source, addr);
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/* else we lose race and someone else inserts
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* it first, don't bother updating
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*/
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spin_unlock(&br->hash_lock);
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}
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}
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static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
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{
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if (fdb->is_local)
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return NUD_PERMANENT;
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else if (fdb->is_static)
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return NUD_NOARP;
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else if (has_expired(fdb->dst->br, fdb))
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return NUD_STALE;
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else
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return NUD_REACHABLE;
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}
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static int fdb_fill_info(struct sk_buff *skb,
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const struct net_bridge_fdb_entry *fdb,
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u32 pid, u32 seq, int type, unsigned int flags)
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{
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unsigned long now = jiffies;
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struct nda_cacheinfo ci;
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struct nlmsghdr *nlh;
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struct ndmsg *ndm;
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nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags);
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if (nlh == NULL)
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return -EMSGSIZE;
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ndm = nlmsg_data(nlh);
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ndm->ndm_family = AF_BRIDGE;
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ndm->ndm_pad1 = 0;
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ndm->ndm_pad2 = 0;
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ndm->ndm_flags = 0;
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ndm->ndm_type = 0;
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ndm->ndm_ifindex = fdb->dst->dev->ifindex;
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ndm->ndm_state = fdb_to_nud(fdb);
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NLA_PUT(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr);
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ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
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ci.ndm_confirmed = 0;
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ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
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ci.ndm_refcnt = 0;
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NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci);
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return nlmsg_end(skb, nlh);
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static inline size_t fdb_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct ndmsg))
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+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
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+ nla_total_size(sizeof(struct nda_cacheinfo));
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}
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static void fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
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{
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struct net *net = dev_net(fdb->dst->dev);
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struct sk_buff *skb;
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int err = -ENOBUFS;
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skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
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if (skb == NULL)
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goto errout;
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err = fdb_fill_info(skb, fdb, 0, 0, type, 0);
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if (err < 0) {
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/* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
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return;
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errout:
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if (err < 0)
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rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
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}
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/* Dump information about entries, in response to GETNEIGH */
|
|
int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct net_device *dev;
|
|
int idx = 0;
|
|
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev) {
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
int i;
|
|
|
|
if (!(dev->priv_flags & IFF_EBRIDGE))
|
|
continue;
|
|
|
|
for (i = 0; i < BR_HASH_SIZE; i++) {
|
|
struct hlist_node *h;
|
|
struct net_bridge_fdb_entry *f;
|
|
|
|
hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
|
|
if (idx < cb->args[0])
|
|
goto skip;
|
|
|
|
if (fdb_fill_info(skb, f,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
RTM_NEWNEIGH,
|
|
NLM_F_MULTI) < 0)
|
|
break;
|
|
skip:
|
|
++idx;
|
|
}
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
/* Create new static fdb entry */
|
|
static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
|
|
__u16 state)
|
|
{
|
|
struct net_bridge *br = source->br;
|
|
struct hlist_head *head = &br->hash[br_mac_hash(addr)];
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
fdb = fdb_find(head, addr);
|
|
if (fdb)
|
|
return -EEXIST;
|
|
|
|
fdb = fdb_create(head, source, addr);
|
|
if (!fdb)
|
|
return -ENOMEM;
|
|
|
|
if (state & NUD_PERMANENT)
|
|
fdb->is_local = fdb->is_static = 1;
|
|
else if (state & NUD_NOARP)
|
|
fdb->is_static = 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Add new permanent fdb entry with RTM_NEWNEIGH */
|
|
int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct ndmsg *ndm;
|
|
struct nlattr *tb[NDA_MAX+1];
|
|
struct net_device *dev;
|
|
struct net_bridge_port *p;
|
|
const __u8 *addr;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
ndm = nlmsg_data(nlh);
|
|
if (ndm->ndm_ifindex == 0) {
|
|
pr_info("bridge: RTM_NEWNEIGH with invalid ifindex\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev = __dev_get_by_index(net, ndm->ndm_ifindex);
|
|
if (dev == NULL) {
|
|
pr_info("bridge: RTM_NEWNEIGH with unknown ifindex\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
|
|
pr_info("bridge: RTM_NEWNEIGH with invalid address\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
addr = nla_data(tb[NDA_LLADDR]);
|
|
if (!is_valid_ether_addr(addr)) {
|
|
pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
p = br_port_get_rtnl(dev);
|
|
if (p == NULL) {
|
|
pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
|
|
dev->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_bh(&p->br->hash_lock);
|
|
err = fdb_add_entry(p, addr, ndm->ndm_state);
|
|
spin_unlock_bh(&p->br->hash_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int fdb_delete_by_addr(struct net_bridge_port *p, const u8 *addr)
|
|
{
|
|
struct net_bridge *br = p->br;
|
|
struct hlist_head *head = &br->hash[br_mac_hash(addr)];
|
|
struct net_bridge_fdb_entry *fdb;
|
|
|
|
fdb = fdb_find(head, addr);
|
|
if (!fdb)
|
|
return -ENOENT;
|
|
|
|
fdb_delete(fdb);
|
|
return 0;
|
|
}
|
|
|
|
/* Remove neighbor entry with RTM_DELNEIGH */
|
|
int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct ndmsg *ndm;
|
|
struct net_bridge_port *p;
|
|
struct nlattr *llattr;
|
|
const __u8 *addr;
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
if (nlmsg_len(nlh) < sizeof(*ndm))
|
|
return -EINVAL;
|
|
|
|
ndm = nlmsg_data(nlh);
|
|
if (ndm->ndm_ifindex == 0) {
|
|
pr_info("bridge: RTM_DELNEIGH with invalid ifindex\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev = __dev_get_by_index(net, ndm->ndm_ifindex);
|
|
if (dev == NULL) {
|
|
pr_info("bridge: RTM_DELNEIGH with unknown ifindex\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR);
|
|
if (llattr == NULL || nla_len(llattr) != ETH_ALEN) {
|
|
pr_info("bridge: RTM_DELNEIGH with invalid address\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
addr = nla_data(llattr);
|
|
|
|
p = br_port_get_rtnl(dev);
|
|
if (p == NULL) {
|
|
pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
|
|
dev->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_bh(&p->br->hash_lock);
|
|
err = fdb_delete_by_addr(p, addr);
|
|
spin_unlock_bh(&p->br->hash_lock);
|
|
|
|
return err;
|
|
}
|