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net: ndo_fdb_dump should report -EMSGSIZE to rtnl_fdb_dump.

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When the send skbuff reaches the end, nlmsg_put and friends returns
-EMSGSIZE but it is silently thrown away in ndo_fdb_dump. It is called
within a for_each_netdev loop and the first fdb entry of a following
netdev could fit in the remaining skbuff.  This breaks the mechanism
of cb->args[0] and idx to keep track of the entries that are already
dumped, which results missing entries in bridge fdb show command.

Signed-off-by: Minoura Makoto <minoura@valinux.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
MINOURA Makoto / 箕浦 真 2016-02-25 14:20:48 +09:00 • committed by David S. Miller
parent 4c0b6eaf37
commit 472681d57a
4 changed files with 23 additions and 7 deletions
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5
net/switchdev/switchdev.c
View file

@ -1093,8 +1093,11 @@ int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
.cb = cb,
.idx = idx,
};
int err;
switchdev_port_obj_dump(dev, &dump.fdb.obj, switchdev_port_fdb_dump_cb);
err = switchdev_port_obj_dump(dev, &dump.fdb.obj,
switchdev_port_fdb_dump_cb);
cb->args[1] = err;
return dump.idx;
}
EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);