linux/net/bridge/br_fdb.c
Nikolay Aleksandrov 7597b266c5 bridge: allow ext learned entries to change ports
current code silently ignores change of port in the request
message. This patch makes sure the port is modified and
notification is sent to userspace.

Fixes: cf6b8e1eed ("bridge: add API to notify bridge driver of learned FBD on offloaded device")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-04 01:49:44 -07:00

1158 lines
27 KiB
C

/*
* Forwarding database
* Linux ethernet bridge
*
* Authors:
* Lennert Buytenhek <buytenh@gnu.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/rculist.h>
#include <linux/spinlock.h>
#include <linux/times.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/jhash.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <asm/unaligned.h>
#include <linux/if_vlan.h>
#include <net/switchdev.h>
#include "br_private.h"
static struct kmem_cache *br_fdb_cache __read_mostly;
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid);
static void fdb_notify(struct net_bridge *br,
const struct net_bridge_fdb_entry *, int);
static u32 fdb_salt __read_mostly;
int __init br_fdb_init(void)
{
br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
sizeof(struct net_bridge_fdb_entry),
0,
SLAB_HWCACHE_ALIGN, NULL);
if (!br_fdb_cache)
return -ENOMEM;
get_random_bytes(&fdb_salt, sizeof(fdb_salt));
return 0;
}
void br_fdb_fini(void)
{
kmem_cache_destroy(br_fdb_cache);
}
/* if topology_changing then use forward_delay (default 15 sec)
* otherwise keep longer (default 5 minutes)
*/
static inline unsigned long hold_time(const struct net_bridge *br)
{
return br->topology_change ? br->forward_delay : br->ageing_time;
}
static inline int has_expired(const struct net_bridge *br,
const struct net_bridge_fdb_entry *fdb)
{
return !fdb->is_static && !fdb->added_by_external_learn &&
time_before_eq(fdb->updated + hold_time(br), jiffies);
}
static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
{
/* use 1 byte of OUI and 3 bytes of NIC */
u32 key = get_unaligned((u32 *)(mac + 2));
return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
}
static void fdb_rcu_free(struct rcu_head *head)
{
struct net_bridge_fdb_entry *ent
= container_of(head, struct net_bridge_fdb_entry, rcu);
kmem_cache_free(br_fdb_cache, ent);
}
static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
const unsigned char *addr,
__u16 vid)
{
struct net_bridge_fdb_entry *f;
WARN_ON_ONCE(!rcu_read_lock_held());
hlist_for_each_entry_rcu(f, head, hlist)
if (ether_addr_equal(f->addr.addr, addr) && f->vlan_id == vid)
break;
return f;
}
/* requires bridge hash_lock */
static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
const unsigned char *addr,
__u16 vid)
{
struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
struct net_bridge_fdb_entry *fdb;
lockdep_assert_held_once(&br->hash_lock);
rcu_read_lock();
fdb = fdb_find_rcu(head, addr, vid);
rcu_read_unlock();
return fdb;
}
struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
const unsigned char *addr,
__u16 vid)
{
struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
return fdb_find_rcu(head, addr, vid);
}
/* When a static FDB entry is added, the mac address from the entry is
* added to the bridge private HW address list and all required ports
* are then updated with the new information.
* Called under RTNL.
*/
static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
{
int err;
struct net_bridge_port *p;
ASSERT_RTNL();
list_for_each_entry(p, &br->port_list, list) {
if (!br_promisc_port(p)) {
err = dev_uc_add(p->dev, addr);
if (err)
goto undo;
}
}
return;
undo:
list_for_each_entry_continue_reverse(p, &br->port_list, list) {
if (!br_promisc_port(p))
dev_uc_del(p->dev, addr);
}
}
/* When a static FDB entry is deleted, the HW address from that entry is
* also removed from the bridge private HW address list and updates all
* the ports with needed information.
* Called under RTNL.
*/
static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
{
struct net_bridge_port *p;
ASSERT_RTNL();
list_for_each_entry(p, &br->port_list, list) {
if (!br_promisc_port(p))
dev_uc_del(p->dev, addr);
}
}
static void fdb_del_external_learn(struct net_bridge_fdb_entry *f)
{
struct switchdev_obj_port_fdb fdb = {
.obj = {
.orig_dev = f->dst->dev,
.id = SWITCHDEV_OBJ_ID_PORT_FDB,
.flags = SWITCHDEV_F_DEFER,
},
.vid = f->vlan_id,
};
ether_addr_copy(fdb.addr, f->addr.addr);
switchdev_port_obj_del(f->dst->dev, &fdb.obj);
}
static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
{
if (f->is_static)
fdb_del_hw_addr(br, f->addr.addr);
if (f->added_by_external_learn)
fdb_del_external_learn(f);
hlist_del_init_rcu(&f->hlist);
fdb_notify(br, f, RTM_DELNEIGH);
call_rcu(&f->rcu, fdb_rcu_free);
}
/* Delete a local entry if no other port had the same address. */
static void fdb_delete_local(struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_fdb_entry *f)
{
const unsigned char *addr = f->addr.addr;
struct net_bridge_vlan_group *vg;
const struct net_bridge_vlan *v;
struct net_bridge_port *op;
u16 vid = f->vlan_id;
/* Maybe another port has same hw addr? */
list_for_each_entry(op, &br->port_list, list) {
vg = nbp_vlan_group(op);
if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
(!vid || br_vlan_find(vg, vid))) {
f->dst = op;
f->added_by_user = 0;
return;
}
}
vg = br_vlan_group(br);
v = br_vlan_find(vg, vid);
/* Maybe bridge device has same hw addr? */
if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
(!vid || (v && br_vlan_should_use(v)))) {
f->dst = NULL;
f->added_by_user = 0;
return;
}
fdb_delete(br, f);
}
void br_fdb_find_delete_local(struct net_bridge *br,
const struct net_bridge_port *p,
const unsigned char *addr, u16 vid)
{
struct net_bridge_fdb_entry *f;
spin_lock_bh(&br->hash_lock);
f = br_fdb_find(br, addr, vid);
if (f && f->is_local && !f->added_by_user && f->dst == p)
fdb_delete_local(br, p, f);
spin_unlock_bh(&br->hash_lock);
}
void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
{
struct net_bridge_vlan_group *vg;
struct net_bridge *br = p->br;
struct net_bridge_vlan *v;
int i;
spin_lock_bh(&br->hash_lock);
vg = nbp_vlan_group(p);
/* Search all chains since old address/hash is unknown */
for (i = 0; i < BR_HASH_SIZE; i++) {
struct hlist_node *h;
hlist_for_each(h, &br->hash[i]) {
struct net_bridge_fdb_entry *f;
f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
if (f->dst == p && f->is_local && !f->added_by_user) {
/* delete old one */
fdb_delete_local(br, p, f);
/* if this port has no vlan information
* configured, we can safely be done at
* this point.
*/
if (!vg || !vg->num_vlans)
goto insert;
}
}
}
insert:
/* insert new address, may fail if invalid address or dup. */
fdb_insert(br, p, newaddr, 0);
if (!vg || !vg->num_vlans)
goto done;
/* Now add entries for every VLAN configured on the port.
* This function runs under RTNL so the bitmap will not change
* from under us.
*/
list_for_each_entry(v, &vg->vlan_list, vlist)
fdb_insert(br, p, newaddr, v->vid);
done:
spin_unlock_bh(&br->hash_lock);
}
void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_fdb_entry *f;
struct net_bridge_vlan *v;
spin_lock_bh(&br->hash_lock);
/* If old entry was unassociated with any port, then delete it. */
f = br_fdb_find(br, br->dev->dev_addr, 0);
if (f && f->is_local && !f->dst && !f->added_by_user)
fdb_delete_local(br, NULL, f);
fdb_insert(br, NULL, newaddr, 0);
vg = br_vlan_group(br);
if (!vg || !vg->num_vlans)
goto out;
/* Now remove and add entries for every VLAN configured on the
* bridge. This function runs under RTNL so the bitmap will not
* change from under us.
*/
list_for_each_entry(v, &vg->vlan_list, vlist) {
if (!br_vlan_should_use(v))
continue;
f = br_fdb_find(br, br->dev->dev_addr, v->vid);
if (f && f->is_local && !f->dst && !f->added_by_user)
fdb_delete_local(br, NULL, f);
fdb_insert(br, NULL, newaddr, v->vid);
}
out:
spin_unlock_bh(&br->hash_lock);
}
void br_fdb_cleanup(struct work_struct *work)
{
struct net_bridge *br = container_of(work, struct net_bridge,
gc_work.work);
unsigned long delay = hold_time(br);
unsigned long work_delay = delay;
unsigned long now = jiffies;
int i;
for (i = 0; i < BR_HASH_SIZE; i++) {
struct net_bridge_fdb_entry *f;
struct hlist_node *n;
if (!br->hash[i].first)
continue;
spin_lock_bh(&br->hash_lock);
hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
unsigned long this_timer;
if (f->is_static)
continue;
if (f->added_by_external_learn)
continue;
this_timer = f->updated + delay;
if (time_after(this_timer, now))
work_delay = min(work_delay, this_timer - now);
else
fdb_delete(br, f);
}
spin_unlock_bh(&br->hash_lock);
cond_resched();
}
/* Cleanup minimum 10 milliseconds apart */
work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
}
/* Completely flush all dynamic entries in forwarding database.*/
void br_fdb_flush(struct net_bridge *br)
{
int i;
spin_lock_bh(&br->hash_lock);
for (i = 0; i < BR_HASH_SIZE; i++) {
struct net_bridge_fdb_entry *f;
struct hlist_node *n;
hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
if (!f->is_static)
fdb_delete(br, f);
}
}
spin_unlock_bh(&br->hash_lock);
}
/* Flush all entries referring to a specific port.
* if do_all is set also flush static entries
* if vid is set delete all entries that match the vlan_id
*/
void br_fdb_delete_by_port(struct net_bridge *br,
const struct net_bridge_port *p,
u16 vid,
int do_all)
{
int i;
spin_lock_bh(&br->hash_lock);
for (i = 0; i < BR_HASH_SIZE; i++) {
struct hlist_node *h, *g;
hlist_for_each_safe(h, g, &br->hash[i]) {
struct net_bridge_fdb_entry *f
= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
if (f->dst != p)
continue;
if (!do_all)
if (f->is_static || (vid && f->vlan_id != vid))
continue;
if (f->is_local)
fdb_delete_local(br, p, f);
else
fdb_delete(br, f);
}
}
spin_unlock_bh(&br->hash_lock);
}
#if IS_ENABLED(CONFIG_ATM_LANE)
/* Interface used by ATM LANE hook to test
* if an addr is on some other bridge port */
int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
{
struct net_bridge_fdb_entry *fdb;
struct net_bridge_port *port;
int ret;
rcu_read_lock();
port = br_port_get_rcu(dev);
if (!port)
ret = 0;
else {
fdb = br_fdb_find_rcu(port->br, addr, 0);
ret = fdb && fdb->dst && fdb->dst->dev != dev &&
fdb->dst->state == BR_STATE_FORWARDING;
}
rcu_read_unlock();
return ret;
}
#endif /* CONFIG_ATM_LANE */
/*
* Fill buffer with forwarding table records in
* the API format.
*/
int br_fdb_fillbuf(struct net_bridge *br, void *buf,
unsigned long maxnum, unsigned long skip)
{
struct __fdb_entry *fe = buf;
int i, num = 0;
struct net_bridge_fdb_entry *f;
memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
rcu_read_lock();
for (i = 0; i < BR_HASH_SIZE; i++) {
hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
if (num >= maxnum)
goto out;
if (has_expired(br, f))
continue;
/* ignore pseudo entry for local MAC address */
if (!f->dst)
continue;
if (skip) {
--skip;
continue;
}
/* convert from internal format to API */
memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
/* due to ABI compat need to split into hi/lo */
fe->port_no = f->dst->port_no;
fe->port_hi = f->dst->port_no >> 8;
fe->is_local = f->is_local;
if (!f->is_static)
fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
++fe;
++num;
}
}
out:
rcu_read_unlock();
return num;
}
static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
struct net_bridge_port *source,
const unsigned char *addr,
__u16 vid,
unsigned char is_local,
unsigned char is_static)
{
struct net_bridge_fdb_entry *fdb;
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->offloaded = 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 = br_fdb_find(br, 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 {
unsigned long now = jiffies;
/* fastpath: update of existing entry */
if (unlikely(source != fdb->dst)) {
fdb->dst = source;
fdb_modified = true;
/* Take over HW learned entry */
if (unlikely(fdb->added_by_external_learn))
fdb->added_by_external_learn = 0;
}
if (now != fdb->updated)
fdb->updated = now;
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_rcu(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 = 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 (fdb->offloaded)
ndm->ndm_flags |= NTF_OFFLOADED;
if (fdb->added_by_external_learn)
ndm->ndm_flags |= NTF_EXT_LEARNED;
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;
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);
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 = br_fdb_find(br, 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 if (ndm->ndm_flags & NTF_EXT_LEARNED) {
err = br_fdb_external_learn_add(br, p, addr, vid);
} 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_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);
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 *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 net_bridge_fdb_entry *fdb;
struct hlist_head *head;
bool modified = false;
int err = 0;
spin_lock_bh(&br->hash_lock);
head = &br->hash[br_mac_hash(addr, vid)];
fdb = br_fdb_find(br, 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 {
fdb->updated = jiffies;
if (fdb->dst != p) {
fdb->dst = p;
modified = true;
}
if (fdb->added_by_external_learn) {
/* Refresh entry */
fdb->used = jiffies;
} else if (!fdb->added_by_user) {
/* Take over SW learned entry */
fdb->added_by_external_learn = 1;
modified = true;
}
if (modified)
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 net_bridge_fdb_entry *fdb;
int err = 0;
spin_lock_bh(&br->hash_lock);
fdb = br_fdb_find(br, addr, vid);
if (fdb && fdb->added_by_external_learn)
fdb_delete(br, fdb);
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)
{
struct net_bridge_fdb_entry *fdb;
spin_lock_bh(&br->hash_lock);
fdb = br_fdb_find(br, addr, vid);
if (fdb)
fdb->offloaded = 1;
spin_unlock_bh(&br->hash_lock);
}