Merge branch 'nla_nest_start'

Michal Kubecek says:

====================
make nla_nest_start() add NLA_F_NESTED flag

One of the comments in recent review of the ethtool netlink series pointed
out that proposed ethnl_nest_start() helper which adds NLA_F_NESTED to
second argument of nla_nest_start() is not really specific to ethtool
netlink code. That is hard to argue with as closer inspection revealed that
exactly the same helper already exists in ipset code (except it's a macro
rather than an inline function).

Another observation was that even if NLA_F_NESTED flag was introduced in
2007, only few netlink based interfaces set it in kernel generated messages
and even many recently added APIs omit it. That is unfortunate as without
the flag, message parsers not familiar with attribute semantics cannot
recognize nested attributes and do not see message structure; this affects
e.g. wireshark dissector or mnl_nlmsg_fprintf() from libmnl.

This is why I'm suggesting to rename existing nla_nest_start() to different
name (nla_nest_start_noflag) and reintroduce nla_nest_start() as a wrapper
adding NLA_F_NESTED flag. This is implemented in first patch which is
mostly generated by spatch. Second patch drops ipset helper macros which
lose their purpose. Third patch cleans up minor coding style issues found
by checkpatch.pl in first patch.

We could leave nla_nest_start() untouched and simply add a wrapper adding
NLA_F_NESTED but that would probably preserve the state when even most new
code doesn't set the flag.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 626629944450..ff8baf810bb3 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -1683,7 +1683,7 @@ static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
 {
         struct nlattr *start;
 
-        start = nla_nest_start(skb, OVS_CT_ATTR_NAT);
+        start = nla_nest_start_noflag(skb, OVS_CT_ATTR_NAT);
         if (!start)
                 return false;
 
@@ -1750,7 +1750,7 @@ int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
 {
         struct nlattr *start;
 
-        start = nla_nest_start(skb, OVS_ACTION_ATTR_CT);
+        start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CT);
         if (!start)
                 return -EMSGSIZE;
 
@@ -2160,7 +2160,7 @@ static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
         if (IS_ERR(reply))
                 return PTR_ERR(reply);
 
-        nla_reply = nla_nest_start(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
+        nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
 
         if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
                 err = ovs_ct_limit_get_zone_limit(