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>

111 files changed, 539 insertions, 466 deletions

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index f2471172a961..1cb5a0b85fd9 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -114,7 +114,7 @@ static int drbd_msg_put_info(struct sk_buff *skb, const char *info)
 	if (!info || !info[0])
 		return 0;
 
-	nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY);
 	if (!nla)
 		return err;
 
@@ -135,7 +135,7 @@ static int drbd_msg_sprintf_info(struct sk_buff *skb, const char *fmt, ...)
 	int err = -EMSGSIZE;
 	int len;
 
-	nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY);
 	if (!nla)
 		return err;
 
@@ -3269,7 +3269,7 @@ static int nla_put_drbd_cfg_context(struct sk_buff *skb,
 				    struct drbd_device *device)
 {
 	struct nlattr *nla;
-	nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_CONTEXT);
 	if (!nla)
 		goto nla_put_failure;
 	if (device &&
@@ -3837,7 +3837,7 @@ static int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
 	if (err)
 		goto nla_put_failure;
 
-	nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_STATE_INFO);
 	if (!nla)
 		goto nla_put_failure;
 	if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 92b8aafb8bb4..cd27f236431d 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -2047,7 +2047,7 @@ static int populate_nbd_status(struct nbd_device *nbd, struct sk_buff *reply)
 	 */
 	if (refcount_read(&nbd->config_refs))
 		connected = 1;
-	dev_opt = nla_nest_start(reply, NBD_DEVICE_ITEM);
+	dev_opt = nla_nest_start_noflag(reply, NBD_DEVICE_ITEM);
 	if (!dev_opt)
 		return -EMSGSIZE;
 	ret = nla_put_u32(reply, NBD_DEVICE_INDEX, nbd->index);
@@ -2095,7 +2095,7 @@ static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info)
 		goto out;
 	}
 
-	dev_list = nla_nest_start(reply, NBD_ATTR_DEVICE_LIST);
+	dev_list = nla_nest_start_noflag(reply, NBD_ATTR_DEVICE_LIST);
 	if (index == -1) {
 		ret = idr_for_each(&nbd_index_idr, &status_cb, reply);
 		if (ret) {
diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 11ed58d3fce5..ad189a29cc67 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -292,7 +292,8 @@ static int fill_res_info_entry(struct sk_buff *msg,
 {
 	struct nlattr *entry_attr;
 
-	entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY);
+	entry_attr = nla_nest_start_noflag(msg,
+					   RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY);
 	if (!entry_attr)
 		return -EMSGSIZE;
 
@@ -327,7 +328,7 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device)
 	if (fill_nldev_handle(msg, device))
 		return -EMSGSIZE;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_SUMMARY);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_RES_SUMMARY);
 	if (!table_attr)
 		return -EMSGSIZE;
 
@@ -1108,7 +1109,7 @@ static int res_get_common_dumpit(struct sk_buff *skb,
 		goto err;
 	}
 
-	table_attr = nla_nest_start(skb, fe->nldev_attr);
+	table_attr = nla_nest_start_noflag(skb, fe->nldev_attr);
 	if (!table_attr) {
 		ret = -EMSGSIZE;
 		goto err;
@@ -1134,7 +1135,7 @@ static int res_get_common_dumpit(struct sk_buff *skb,
 
 		filled = true;
 
-		entry_attr = nla_nest_start(skb, fe->entry);
+		entry_attr = nla_nest_start_noflag(skb, fe->entry);
 		if (!entry_attr) {
 			ret = -EMSGSIZE;
 			rdma_restrack_put(res);
diff --git a/drivers/infiniband/hw/cxgb4/restrack.c b/drivers/infiniband/hw/cxgb4/restrack.c
index 9a7520ee41e0..f82d46ed969d 100644
--- a/drivers/infiniband/hw/cxgb4/restrack.c
+++ b/drivers/infiniband/hw/cxgb4/restrack.c
@@ -149,7 +149,7 @@ static int fill_res_qp_entry(struct sk_buff *msg,
 	if (qhp->ucontext)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err;
 
@@ -216,7 +216,7 @@ static int fill_res_ep_entry(struct sk_buff *msg,
 	if (!uep)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err_free_uep;
 
@@ -387,7 +387,7 @@ static int fill_res_cq_entry(struct sk_buff *msg,
 	if (ibcq->uobject)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err;
 
@@ -447,7 +447,7 @@ static int fill_res_mr_entry(struct sk_buff *msg,
 	if (!stag)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err;
 
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);