netlink: make nla_nest_start() add NLA_F_NESTED flag

Even if the NLA_F_NESTED flag was introduced more than 11 years ago, most
netlink based interfaces (including recently added ones) are still not
setting it in kernel generated messages. Without the flag, message parsers
not aware of attribute semantics (e.g. wireshark dissector or libmnl's
mnl_nlmsg_fprintf()) cannot recognize nested attributes and won't display
the structure of their contents.

Unfortunately we cannot just add the flag everywhere as there may be
userspace applications which check nlattr::nla_type directly rather than
through a helper masking out the flags. Therefore the patch renames
nla_nest_start() to nla_nest_start_noflag() and introduces nla_nest_start()
as a wrapper adding NLA_F_NESTED. The calls which add NLA_F_NESTED manually
are rewritten to use nla_nest_start().

Except for changes in include/net/netlink.h, the patch was generated using
this semantic patch:

@@ expression E1, E2; @@
-nla_nest_start(E1, E2)
+nla_nest_start_noflag(E1, E2)

@@ expression E1, E2; @@
-nla_nest_start_noflag(E1, E2 | NLA_F_NESTED)
+nla_nest_start(E1, E2)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index 287793abfaf9..ce4b54fa7834 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -108,14 +108,15 @@ err_out:
 static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
 				 struct tcf_pedit_key_ex *keys_ex, int n)
 {
-	struct nlattr *keys_start = nla_nest_start(skb, TCA_PEDIT_KEYS_EX);
+	struct nlattr *keys_start = nla_nest_start_noflag(skb,
+							  TCA_PEDIT_KEYS_EX);
 
 	if (!keys_start)
 		goto nla_failure;
 	for (; n > 0; n--) {
 		struct nlattr *key_start;
 
-		key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);
+		key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
 		if (!key_start)
 			goto nla_failure;