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, 18 insertions, 16 deletions

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 308370cfd668..1a002eb85096 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -312,7 +312,7 @@ static inline void *nl802154hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
 static int
 nl802154_put_flags(struct sk_buff *msg, int attr, u32 mask)
 {
-	struct nlattr *nl_flags = nla_nest_start(msg, attr);
+	struct nlattr *nl_flags = nla_nest_start_noflag(msg, attr);
 	int i;
 
 	if (!nl_flags)
@@ -338,7 +338,7 @@ nl802154_send_wpan_phy_channels(struct cfg802154_registered_device *rdev,
 	struct nlattr *nl_page;
 	unsigned long page;
 
-	nl_page = nla_nest_start(msg, NL802154_ATTR_CHANNELS_SUPPORTED);
+	nl_page = nla_nest_start_noflag(msg, NL802154_ATTR_CHANNELS_SUPPORTED);
 	if (!nl_page)
 		return -ENOBUFS;
 
@@ -360,11 +360,11 @@ nl802154_put_capabilities(struct sk_buff *msg,
 	struct nlattr *nl_caps, *nl_channels;
 	int i;
 
-	nl_caps = nla_nest_start(msg, NL802154_ATTR_WPAN_PHY_CAPS);
+	nl_caps = nla_nest_start_noflag(msg, NL802154_ATTR_WPAN_PHY_CAPS);
 	if (!nl_caps)
 		return -ENOBUFS;
 
-	nl_channels = nla_nest_start(msg, NL802154_CAP_ATTR_CHANNELS);
+	nl_channels = nla_nest_start_noflag(msg, NL802154_CAP_ATTR_CHANNELS);
 	if (!nl_channels)
 		return -ENOBUFS;
 
@@ -380,8 +380,8 @@ nl802154_put_capabilities(struct sk_buff *msg,
 	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_CCA_ED_LEVEL) {
 		struct nlattr *nl_ed_lvls;
 
-		nl_ed_lvls = nla_nest_start(msg,
-					    NL802154_CAP_ATTR_CCA_ED_LEVELS);
+		nl_ed_lvls = nla_nest_start_noflag(msg,
+						   NL802154_CAP_ATTR_CCA_ED_LEVELS);
 		if (!nl_ed_lvls)
 			return -ENOBUFS;
 
@@ -396,7 +396,8 @@ nl802154_put_capabilities(struct sk_buff *msg,
 	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_TXPOWER) {
 		struct nlattr *nl_tx_pwrs;
 
-		nl_tx_pwrs = nla_nest_start(msg, NL802154_CAP_ATTR_TX_POWERS);
+		nl_tx_pwrs = nla_nest_start_noflag(msg,
+						   NL802154_CAP_ATTR_TX_POWERS);
 		if (!nl_tx_pwrs)
 			return -ENOBUFS;
 
@@ -504,7 +505,7 @@ static int nl802154_send_wpan_phy(struct cfg802154_registered_device *rdev,
 	if (nl802154_put_capabilities(msg, rdev))
 		goto nla_put_failure;
 
-	nl_cmds = nla_nest_start(msg, NL802154_ATTR_SUPPORTED_COMMANDS);
+	nl_cmds = nla_nest_start_noflag(msg, NL802154_ATTR_SUPPORTED_COMMANDS);
 	if (!nl_cmds)
 		goto nla_put_failure;
 
@@ -693,7 +694,8 @@ ieee802154_llsec_send_key_id(struct sk_buff *msg,
 
 	switch (desc->mode) {
 	case NL802154_KEY_ID_MODE_IMPLICIT:
-		nl_dev_addr = nla_nest_start(msg, NL802154_KEY_ID_ATTR_IMPLICIT);
+		nl_dev_addr = nla_nest_start_noflag(msg,
+						    NL802154_KEY_ID_ATTR_IMPLICIT);
 		if (!nl_dev_addr)
 			return -ENOBUFS;
 
@@ -768,7 +770,7 @@ static int nl802154_get_llsec_params(struct sk_buff *msg,
 			 params.frame_counter))
 		return -ENOBUFS;
 
-	nl_key_id = nla_nest_start(msg, NL802154_ATTR_SEC_OUT_KEY_ID);
+	nl_key_id = nla_nest_start_noflag(msg, NL802154_ATTR_SEC_OUT_KEY_ID);
 	if (!nl_key_id)
 		return -ENOBUFS;
 
@@ -1455,11 +1457,11 @@ static int nl802154_send_key(struct sk_buff *msg, u32 cmd, u32 portid,
 	if (nla_put_u32(msg, NL802154_ATTR_IFINDEX, dev->ifindex))
 		goto nla_put_failure;
 
-	nl_key = nla_nest_start(msg, NL802154_ATTR_SEC_KEY);
+	nl_key = nla_nest_start_noflag(msg, NL802154_ATTR_SEC_KEY);
 	if (!nl_key)
 		goto nla_put_failure;
 
-	nl_key_id = nla_nest_start(msg, NL802154_KEY_ATTR_ID);
+	nl_key_id = nla_nest_start_noflag(msg, NL802154_KEY_ATTR_ID);
 	if (!nl_key_id)
 		goto nla_put_failure;
 
@@ -1639,7 +1641,7 @@ static int nl802154_send_device(struct sk_buff *msg, u32 cmd, u32 portid,
 	if (nla_put_u32(msg, NL802154_ATTR_IFINDEX, dev->ifindex))
 		goto nla_put_failure;
 
-	nl_device = nla_nest_start(msg, NL802154_ATTR_SEC_DEVICE);
+	nl_device = nla_nest_start_noflag(msg, NL802154_ATTR_SEC_DEVICE);
 	if (!nl_device)
 		goto nla_put_failure;
 
@@ -1808,7 +1810,7 @@ static int nl802154_send_devkey(struct sk_buff *msg, u32 cmd, u32 portid,
 	if (nla_put_u32(msg, NL802154_ATTR_IFINDEX, dev->ifindex))
 		goto nla_put_failure;
 
-	nl_devkey = nla_nest_start(msg, NL802154_ATTR_SEC_DEVKEY);
+	nl_devkey = nla_nest_start_noflag(msg, NL802154_ATTR_SEC_DEVKEY);
 	if (!nl_devkey)
 		goto nla_put_failure;
 
@@ -1818,7 +1820,7 @@ static int nl802154_send_devkey(struct sk_buff *msg, u32 cmd, u32 portid,
 			devkey->frame_counter))
 		goto nla_put_failure;
 
-	nl_key_id = nla_nest_start(msg, NL802154_DEVKEY_ATTR_ID);
+	nl_key_id = nla_nest_start_noflag(msg, NL802154_DEVKEY_ATTR_ID);
 	if (!nl_key_id)
 		goto nla_put_failure;
 
@@ -1976,7 +1978,7 @@ static int nl802154_send_seclevel(struct sk_buff *msg, u32 cmd, u32 portid,
 	if (nla_put_u32(msg, NL802154_ATTR_IFINDEX, dev->ifindex))
 		goto nla_put_failure;
 
-	nl_seclevel = nla_nest_start(msg, NL802154_ATTR_SEC_LEVEL);
+	nl_seclevel = nla_nest_start_noflag(msg, NL802154_ATTR_SEC_LEVEL);
 	if (!nl_seclevel)
 		goto nla_put_failure;