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>

6 files changed, 30 insertions, 25 deletions

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index b286f591242e..022044b59d6a 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -546,7 +546,7 @@ static int bond_fill_info(struct sk_buff *skb,
 	if (nla_put_u32(skb, IFLA_BOND_ARP_INTERVAL, bond->params.arp_interval))
 		goto nla_put_failure;
 
-	targets = nla_nest_start(skb, IFLA_BOND_ARP_IP_TARGET);
+	targets = nla_nest_start_noflag(skb, IFLA_BOND_ARP_IP_TARGET);
 	if (!targets)
 		goto nla_put_failure;
 
@@ -644,7 +644,7 @@ static int bond_fill_info(struct sk_buff *skb,
 		if (!bond_3ad_get_active_agg_info(bond, &info)) {
 			struct nlattr *nest;
 
-			nest = nla_nest_start(skb, IFLA_BOND_AD_INFO);
+			nest = nla_nest_start_noflag(skb, IFLA_BOND_AD_INFO);
 			if (!nest)
 				goto nla_put_failure;
 
@@ -711,7 +711,7 @@ static int bond_fill_linkxstats(struct sk_buff *skb,
 		return -EINVAL;
 	}
 
-	nest = nla_nest_start(skb, LINK_XSTATS_TYPE_BOND);
+	nest = nla_nest_start_noflag(skb, LINK_XSTATS_TYPE_BOND);
 	if (!nest)
 		return -EMSGSIZE;
 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
@@ -722,7 +722,7 @@ static int bond_fill_linkxstats(struct sk_buff *skb,
 		else
 			stats = &BOND_AD_INFO(bond).stats;
 
-		nest2 = nla_nest_start(skb, BOND_XSTATS_3AD);
+		nest2 = nla_nest_start_noflag(skb, BOND_XSTATS_3AD);
 		if (!nest2) {
 			nla_nest_end(skb, nest);
 			return -EMSGSIZE;
diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
index 707285953750..80ca300aba04 100644
--- a/drivers/net/ieee802154/mac802154_hwsim.c
+++ b/drivers/net/ieee802154/mac802154_hwsim.c
@@ -227,14 +227,16 @@ static int append_radio_msg(struct sk_buff *skb, struct hwsim_phy *phy)
 		return 0;
 	}
 
-	nl_edges = nla_nest_start(skb, MAC802154_HWSIM_ATTR_RADIO_EDGES);
+	nl_edges = nla_nest_start_noflag(skb,
+					 MAC802154_HWSIM_ATTR_RADIO_EDGES);
 	if (!nl_edges) {
 		rcu_read_unlock();
 		return -ENOBUFS;
 	}
 
 	list_for_each_entry_rcu(e, &phy->edges, list) {
-		nl_edge = nla_nest_start(skb, MAC802154_HWSIM_ATTR_RADIO_EDGE);
+		nl_edge = nla_nest_start_noflag(skb,
+						MAC802154_HWSIM_ATTR_RADIO_EDGE);
 		if (!nl_edge) {
 			rcu_read_unlock();
 			nla_nest_cancel(skb, nl_edges);
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 263bfafdb004..8dedb9a9781e 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -2365,7 +2365,8 @@ copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats)
 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
 {
 	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
-	struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
+	struct nlattr *secy_nest = nla_nest_start_noflag(skb,
+							 MACSEC_ATTR_SECY);
 	u64 csid;
 
 	if (!secy_nest)
@@ -2435,7 +2436,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 	if (nla_put_secy(secy, skb))
 		goto nla_put_failure;
 
-	attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
+	attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
 	if (!attr)
 		goto nla_put_failure;
 	if (copy_tx_sc_stats(skb, tx_sc->stats)) {
@@ -2444,7 +2445,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 	}
 	nla_nest_end(skb, attr);
 
-	attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
+	attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
 	if (!attr)
 		goto nla_put_failure;
 	if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
@@ -2453,7 +2454,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 	}
 	nla_nest_end(skb, attr);
 
-	txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
+	txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
 	if (!txsa_list)
 		goto nla_put_failure;
 	for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
@@ -2463,7 +2464,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 		if (!tx_sa)
 			continue;
 
-		txsa_nest = nla_nest_start(skb, j++);
+		txsa_nest = nla_nest_start_noflag(skb, j++);
 		if (!txsa_nest) {
 			nla_nest_cancel(skb, txsa_list);
 			goto nla_put_failure;
@@ -2478,7 +2479,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 			goto nla_put_failure;
 		}
 
-		attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
+		attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
 		if (!attr) {
 			nla_nest_cancel(skb, txsa_nest);
 			nla_nest_cancel(skb, txsa_list);
@@ -2496,7 +2497,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 	}
 	nla_nest_end(skb, txsa_list);
 
-	rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
+	rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
 	if (!rxsc_list)
 		goto nla_put_failure;
 
@@ -2504,7 +2505,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 	for_each_rxsc_rtnl(secy, rx_sc) {
 		int k;
 		struct nlattr *rxsa_list;
-		struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
+		struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
 
 		if (!rxsc_nest) {
 			nla_nest_cancel(skb, rxsc_list);
@@ -2519,7 +2520,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 			goto nla_put_failure;
 		}
 
-		attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
+		attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
 		if (!attr) {
 			nla_nest_cancel(skb, rxsc_nest);
 			nla_nest_cancel(skb, rxsc_list);
@@ -2533,7 +2534,8 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 		}
 		nla_nest_end(skb, attr);
 
-		rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
+		rxsa_list = nla_nest_start_noflag(skb,
+						  MACSEC_RXSC_ATTR_SA_LIST);
 		if (!rxsa_list) {
 			nla_nest_cancel(skb, rxsc_nest);
 			nla_nest_cancel(skb, rxsc_list);
@@ -2547,7 +2549,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 			if (!rx_sa)
 				continue;
 
-			rxsa_nest = nla_nest_start(skb, k++);
+			rxsa_nest = nla_nest_start_noflag(skb, k++);
 			if (!rxsa_nest) {
 				nla_nest_cancel(skb, rxsa_list);
 				nla_nest_cancel(skb, rxsc_nest);
@@ -2555,7 +2557,8 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
 				goto nla_put_failure;
 			}
 
-			attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
+			attr = nla_nest_start_noflag(skb,
+						     MACSEC_SA_ATTR_STATS);
 			if (!attr) {
 				nla_nest_cancel(skb, rxsa_list);
 				nla_nest_cancel(skb, rxsc_nest);
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 4a6be8fab884..b395423b19bc 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1624,7 +1624,7 @@ static int macvlan_fill_info(struct sk_buff *skb,
 	if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
 		goto nla_put_failure;
 	if (vlan->macaddr_count > 0) {
-		nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
+		nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
 		if (nest == NULL)
 			goto nla_put_failure;
 
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index eb4711bfc52a..6306897c147f 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2290,7 +2290,7 @@ static int team_nl_fill_one_option_get(struct sk_buff *skb, struct team *team,
 	if (err)
 		return err;
 
-	option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
+	option_item = nla_nest_start_noflag(skb, TEAM_ATTR_ITEM_OPTION);
 	if (!option_item)
 		return -EMSGSIZE;
 
@@ -2404,7 +2404,7 @@ start_again:
 
 	if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
 		goto nla_put_failure;
-	option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
+	option_list = nla_nest_start_noflag(skb, TEAM_ATTR_LIST_OPTION);
 	if (!option_list)
 		goto nla_put_failure;
 
@@ -2626,7 +2626,7 @@ static int team_nl_fill_one_port_get(struct sk_buff *skb,
 {
 	struct nlattr *port_item;
 
-	port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
+	port_item = nla_nest_start_noflag(skb, TEAM_ATTR_ITEM_PORT);
 	if (!port_item)
 		goto nest_cancel;
 	if (nla_put_u32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex))
@@ -2681,7 +2681,7 @@ start_again:
 
 	if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
 		goto nla_put_failure;
-	port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
+	port_list = nla_nest_start_noflag(skb, TEAM_ATTR_LIST_PORT);
 	if (!port_list)
 		goto nla_put_failure;
 
diff --git a/drivers/net/wireless/ath/wil6210/cfg80211.c b/drivers/net/wireless/ath/wil6210/cfg80211.c
index a1e226652b4a..cac18e61474e 100644
--- a/drivers/net/wireless/ath/wil6210/cfg80211.c
+++ b/drivers/net/wireless/ath/wil6210/cfg80211.c
@@ -2679,13 +2679,13 @@ static int wil_rf_sector_get_cfg(struct wiphy *wiphy,
 			      QCA_ATTR_PAD))
 		goto nla_put_failure;
 
-	nl_cfgs = nla_nest_start(msg, QCA_ATTR_DMG_RF_SECTOR_CFG);
+	nl_cfgs = nla_nest_start_noflag(msg, QCA_ATTR_DMG_RF_SECTOR_CFG);
 	if (!nl_cfgs)
 		goto nla_put_failure;
 	for (i = 0; i < WMI_MAX_RF_MODULES_NUM; i++) {
 		if (!(rf_modules_vec & BIT(i)))
 			continue;
-		nl_cfg = nla_nest_start(msg, i);
+		nl_cfg = nla_nest_start_noflag(msg, i);
 		if (!nl_cfg)
 			goto nla_put_failure;
 		si = &reply.evt.sectors_info[i];