Skip to content

Commit

Permalink
net: bridge: Notify about !added_by_user FDB entries
Browse files Browse the repository at this point in the history 
Do not automatically bail out on sending notifications about activity on
non-user-added FDB entries. Instead, notify about this activity except
for cases where the activity itself originates in a notification, to
avoid sending duplicate notifications.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
  • Loading branch information
@pmachata @davem330
pmachata authored and davem330 committed May 3, 2018
1 parent 816a3be commit 161d82d
Show file tree
Hide file tree
Showing 4 changed files with 33 additions and 26 deletions.
4 changes: 2 additions & 2 deletions net/bridge/br.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,7 @@ static int br_switchdev_event(struct notifier_block *unused,
case SWITCHDEV_FDB_ADD_TO_BRIDGE:
fdb_info = ptr;
err = br_fdb_external_learn_add(br, p, fdb_info->addr,
fdb_info->vid);
fdb_info->vid, false);
if (err) {
err = notifier_from_errno(err);
break;
Expand All @@ -156,7 +156,7 @@ static int br_switchdev_event(struct notifier_block *unused,
case SWITCHDEV_FDB_DEL_TO_BRIDGE:
fdb_info = ptr;
err = br_fdb_external_learn_del(br, p, fdb_info->addr,
fdb_info->vid);
fdb_info->vid, false);
if (err)
err = notifier_from_errno(err);
break;
Expand Down
47 changes: 26 additions & 21 deletions net/bridge/br_fdb.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@ 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);
const struct net_bridge_fdb_entry *, int, bool);

int __init br_fdb_init(void)
{
Expand Down Expand Up @@ -195,7 +195,8 @@ static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
}
}

static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
bool swdev_notify)
{
trace_fdb_delete(br, f);

Expand All @@ -205,7 +206,7 @@ static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
hlist_del_init_rcu(&f->fdb_node);
rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
br_fdb_rht_params);
fdb_notify(br, f, RTM_DELNEIGH);
fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
call_rcu(&f->rcu, fdb_rcu_free);
}

Expand Down Expand Up @@ -241,7 +242,7 @@ static void fdb_delete_local(struct net_bridge *br,
return;
}

fdb_delete(br, f);
fdb_delete(br, f, true);
}

void br_fdb_find_delete_local(struct net_bridge *br,
Expand Down Expand Up @@ -356,7 +357,7 @@ void br_fdb_cleanup(struct work_struct *work)
} else {
spin_lock_bh(&br->hash_lock);
if (!hlist_unhashed(&f->fdb_node))
fdb_delete(br, f);
fdb_delete(br, f, true);
spin_unlock_bh(&br->hash_lock);
}
}
Expand All @@ -376,7 +377,7 @@ void br_fdb_flush(struct net_bridge *br)
spin_lock_bh(&br->hash_lock);
hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
if (!f->is_static)
fdb_delete(br, f);
fdb_delete(br, f, true);
}
spin_unlock_bh(&br->hash_lock);
}
Expand Down Expand Up @@ -405,7 +406,7 @@ void br_fdb_delete_by_port(struct net_bridge *br,
if (f->is_local)
fdb_delete_local(br, p, f);
else
fdb_delete(br, f);
fdb_delete(br, f, true);
}
spin_unlock_bh(&br->hash_lock);
}
Expand Down Expand Up @@ -531,15 +532,15 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
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_delete(br, fdb, true);
}

fdb = fdb_create(br, source, addr, vid, 1, 1);
if (!fdb)
return -ENOMEM;

fdb_add_hw_addr(br, addr);
fdb_notify(br, fdb, RTM_NEWNEIGH);
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
return 0;
}

Expand Down Expand Up @@ -594,7 +595,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
fdb->added_by_user = 1;
if (unlikely(fdb_modified)) {
trace_br_fdb_update(br, source, addr, vid, added_by_user);
fdb_notify(br, fdb, RTM_NEWNEIGH);
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
}
}
} else {
Expand All @@ -605,7 +606,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
fdb->added_by_user = 1;
trace_br_fdb_update(br, source, addr, vid,
added_by_user);
fdb_notify(br, fdb, RTM_NEWNEIGH);
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
}
/* else we lose race and someone else inserts
* it first, don't bother updating
Expand Down Expand Up @@ -687,13 +688,15 @@ static inline size_t fdb_nlmsg_size(void)
}

static void fdb_notify(struct net_bridge *br,
const struct net_bridge_fdb_entry *fdb, int type)
const struct net_bridge_fdb_entry *fdb, int type,
bool swdev_notify)
{
struct net *net = dev_net(br->dev);
struct sk_buff *skb;
int err = -ENOBUFS;

br_switchdev_fdb_notify(fdb, type);
if (swdev_notify)
br_switchdev_fdb_notify(fdb, type);

skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
if (skb == NULL)
Expand Down Expand Up @@ -832,7 +835,7 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
fdb->used = jiffies;
if (modified) {
fdb->updated = jiffies;
fdb_notify(br, fdb, RTM_NEWNEIGH);
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
}

return 0;
Expand All @@ -856,7 +859,7 @@ static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
rcu_read_unlock();
local_bh_enable();
} else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
err = br_fdb_external_learn_add(br, p, addr, vid);
err = br_fdb_external_learn_add(br, p, addr, vid, true);
} else {
spin_lock_bh(&br->hash_lock);
err = fdb_add_entry(br, p, addr, ndm->ndm_state,
Expand Down Expand Up @@ -945,7 +948,7 @@ static int fdb_delete_by_addr_and_port(struct net_bridge *br,
if (!fdb || fdb->dst != p)
return -ENOENT;

fdb_delete(br, fdb);
fdb_delete(br, fdb, true);

return 0;
}
Expand Down Expand Up @@ -1065,7 +1068,8 @@ void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
}

int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid)
const unsigned char *addr, u16 vid,
bool swdev_notify)
{
struct net_bridge_fdb_entry *fdb;
bool modified = false;
Expand All @@ -1083,7 +1087,7 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
goto err_unlock;
}
fdb->added_by_external_learn = 1;
fdb_notify(br, fdb, RTM_NEWNEIGH);
fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
} else {
fdb->updated = jiffies;

Expand All @@ -1102,7 +1106,7 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
}

if (modified)
fdb_notify(br, fdb, RTM_NEWNEIGH);
fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
}

err_unlock:
Expand All @@ -1112,7 +1116,8 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
}

int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid)
const unsigned char *addr, u16 vid,
bool swdev_notify)
{
struct net_bridge_fdb_entry *fdb;
int err = 0;
Expand All @@ -1121,7 +1126,7 @@ int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,

fdb = br_fdb_find(br, addr, vid);
if (fdb && fdb->added_by_external_learn)
fdb_delete(br, fdb);
fdb_delete(br, fdb, swdev_notify);
else
err = -ENOENT;

Expand Down
6 changes: 4 additions & 2 deletions net/bridge/br_private.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -553,9 +553,11 @@ int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid);
const unsigned char *addr, u16 vid,
bool swdev_notify);
int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid);
const unsigned char *addr, u16 vid,
bool swdev_notify);
void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid);

Expand Down
2 changes: 1 addition & 1 deletion net/bridge/br_switchdev.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -118,7 +118,7 @@ br_switchdev_fdb_call_notifiers(bool adding, const unsigned char *mac,
void
br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
{
if (!fdb->added_by_user || !fdb->dst)
if (!fdb->dst)
return;

switch (type) {
Expand Down

0 comments on commit 161d82d

Please sign in to comment.