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, 7 insertions, 7 deletions

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 5a87e271d35a..641ad7575f24 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -242,7 +242,7 @@ static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 			       (unsigned long)p->tcfa_tm.lastuse))
 			continue;
 
-		nest = nla_nest_start(skb, n_i);
+		nest = nla_nest_start_noflag(skb, n_i);
 		if (!nest) {
 			index--;
 			goto nla_put_failure;
@@ -299,7 +299,7 @@ static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 	struct tc_action *p;
 	unsigned long id = 1;
 
-	nest = nla_nest_start(skb, 0);
+	nest = nla_nest_start_noflag(skb, 0);
 	if (nest == NULL)
 		goto nla_put_failure;
 	if (nla_put_string(skb, TCA_KIND, ops->kind))
@@ -776,7 +776,7 @@ tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 	}
 	rcu_read_unlock();
 
-	nest = nla_nest_start(skb, TCA_OPTIONS);
+	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
 	if (nest == NULL)
 		goto nla_put_failure;
 	err = tcf_action_dump_old(skb, a, bind, ref);
@@ -800,7 +800,7 @@ int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
 
 	for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
 		a = actions[i];
-		nest = nla_nest_start(skb, a->order);
+		nest = nla_nest_start_noflag(skb, a->order);
 		if (nest == NULL)
 			goto nla_put_failure;
 		err = tcf_action_dump_1(skb, a, bind, ref);
@@ -1052,7 +1052,7 @@ static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
 	t->tca__pad1 = 0;
 	t->tca__pad2 = 0;
 
-	nest = nla_nest_start(skb, TCA_ACT_TAB);
+	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
 	if (!nest)
 		goto out_nlmsg_trim;
 
@@ -1176,7 +1176,7 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
 	t->tca__pad1 = 0;
 	t->tca__pad2 = 0;
 
-	nest = nla_nest_start(skb, TCA_ACT_TAB);
+	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
 	if (!nest) {
 		NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
 		goto out_module_put;
@@ -1508,7 +1508,7 @@ static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
 	if (!count_attr)
 		goto out_module_put;
 
-	nest = nla_nest_start(skb, TCA_ACT_TAB);
+	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
 	if (nest == NULL)
 		goto out_module_put;