[PATCH v3 0/5] netlink extended ACK reporting

[PATCH v3 0/5] netlink extended ACK reporting

[Johannes Berg]

Changes since v2:
 * add NUM_NLMSGERR_ATTRS, NLMSGERR_ATTR_MAX
 * fix cookie length to 20 (sha-1 length)
 * move struct members for cookie to patch 3 where they should be
 * another cleanup suggested by David Ahern

johannes

[PATCH v3 1/5] netlink: extended ACK reporting

[Johannes Berg]

From: Johannes Berg <johannes.berg@intel.com>

Add the base infrastructure and UAPI for netlink
extended ACK reporting. All "manual" calls to
netlink_ack() pass NULL for now and thus don't
get extended ACK reporting.

Big thanks goes to Pablo Neira Ayuso for not only
bringing up the whole topic at netconf (again) but
also coming up with the nlattr passing trick and
various other ideads.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 crypto/crypto_user.c              |  3 +-
 drivers/infiniband/core/netlink.c |  5 +--
 drivers/scsi/scsi_netlink.c       |  2 +-
 include/linux/netlink.h           | 28 ++++++++++++++-
 include/net/netlink.h             |  3 +-
 include/uapi/linux/netlink.h      | 29 ++++++++++++++++
 kernel/audit.c                    |  2 +-
 net/core/rtnetlink.c              |  3 +-
 net/core/sock_diag.c              |  3 +-
 net/decnet/netfilter/dn_rtmsg.c   |  2 +-
 net/hsr/hsr_netlink.c             |  4 +--
 net/netfilter/ipset/ip_set_core.c |  2 +-
 net/netfilter/nfnetlink.c         | 22 ++++++------
 net/netlink/af_netlink.c          | 71 ++++++++++++++++++++++++++++++++++-----
 net/netlink/af_netlink.h          |  1 +
 net/netlink/genetlink.c           |  3 +-
 net/xfrm/xfrm_user.c              |  3 +-
 17 files changed, 152 insertions(+), 34 deletions(-)

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index a90404a0c5ff..4a44830741c1 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -483,7 +483,8 @@ static const struct crypto_link {
 	[CRYPTO_MSG_DELRNG	- CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
 };
 
-static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
+			       struct netlink_ext_ack *extack)
 {
 	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
 	const struct crypto_link *link;
diff --git a/drivers/infiniband/core/netlink.c b/drivers/infiniband/core/netlink.c
index 10469b0088b5..b784055423c8 100644
--- a/drivers/infiniband/core/netlink.c
+++ b/drivers/infiniband/core/netlink.c
@@ -146,7 +146,8 @@ int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
 }
 EXPORT_SYMBOL(ibnl_put_attr);
 
-static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
+			struct netlink_ext_ack *extack)
 {
 	struct ibnl_client *client;
 	int type = nlh->nlmsg_type;
@@ -209,7 +210,7 @@ static void ibnl_rcv_reply_skb(struct sk_buff *skb)
 		if (nlh->nlmsg_flags & NLM_F_REQUEST)
 			return;
 
-		ibnl_rcv_msg(skb, nlh);
+		ibnl_rcv_msg(skb, nlh, NULL);
 
 		msglen = NLMSG_ALIGN(nlh->nlmsg_len);
 		if (msglen > skb->len)
diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
index 109802f776ed..50e624fb8307 100644
--- a/drivers/scsi/scsi_netlink.c
+++ b/drivers/scsi/scsi_netlink.c
@@ -111,7 +111,7 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
 
 next_msg:
 		if ((err) || (nlh->nlmsg_flags & NLM_F_ACK))
-			netlink_ack(skb, nlh, err);
+			netlink_ack(skb, nlh, err, NULL);
 
 		skb_pull(skb, rlen);
 	}
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index da14ab61f363..746359c27396 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -62,11 +62,37 @@ netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
 	return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
 }
 
+/**
+ * struct netlink_ext_ack - netlink extended ACK report struct
+ * @_msg: message string to report - don't access directly, use
+ *	%NL_SET_ERR_MSG
+ * @bad_attr: attribute with error
+ * @missing_attr: number of missing attr (or 0)
+ */
+struct netlink_ext_ack {
+	const char *_msg;
+	const struct nlattr *bad_attr;
+	u16 missing_attr;
+};
+
+/* Always use this macro, this allows later putting the
+ * message into a separate section or such for things
+ * like translation or listing all possible messages.
+ * Currently string formatting is not supported (due
+ * to the lack of an output buffer.)
+ */
+#define NL_SET_ERR_MSG(extack, msg) do {	\
+	static const char *_msg = (msg);	\
+						\
+	(extack)->_msg = _msg;			\
+} while (0)
+
 extern void netlink_kernel_release(struct sock *sk);
 extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
 extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
-extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
+extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
+			const struct netlink_ext_ack *extack);
 extern int netlink_has_listeners(struct sock *sk, unsigned int group);
 
 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
diff --git a/include/net/netlink.h b/include/net/netlink.h
index b239fcd33d80..a064ec3e2ee1 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -233,7 +233,8 @@ struct nl_info {
 };
 
 int netlink_rcv_skb(struct sk_buff *skb,
-		    int (*cb)(struct sk_buff *, struct nlmsghdr *));
+		    int (*cb)(struct sk_buff *, struct nlmsghdr *,
+			      struct netlink_ext_ack *));
 int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
 		 unsigned int group, int report, gfp_t flags);
 
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
index f3946a27bd07..5f1a48b140c8 100644
--- a/include/uapi/linux/netlink.h
+++ b/include/uapi/linux/netlink.h
@@ -101,6 +101,34 @@ struct nlmsghdr {
 struct nlmsgerr {
 	int		error;
 	struct nlmsghdr msg;
+	/*
+	 * followed by the message contents unless NETLINK_CAP_ACK was set,
+	 * message length is aligned with NLMSG_ALIGN()
+	 */
+	/*
+	 * followed by TLVs defined in enum nlmsgerr_attrs
+	 * if NETLINK_EXT_ACK was set
+	 */
+};
+
+/**
+ * enum nlmsgerr_attrs - nlmsgerr attributes
+ * @NLMSGERR_ATTR_UNUSED: unused
+ * @NLMSGERR_ATTR_MSG: error message string (string)
+ * @NLMSGERR_ATTR_OFFS: error offset in the original message (u32)
+ * @NLMSGERR_ATTR_ATTR: top-level attribute that caused the error
+ *	(or is missing, u16)
+ * @NUM_NLMSGERR_ATTRS: number of attributes
+ * @NLMSGERR_ATTR_MAX: highest attribute number
+ */
+enum nlmsgerr_attrs {
+	NLMSGERR_ATTR_UNUSED,
+	NLMSGERR_ATTR_MSG,
+	NLMSGERR_ATTR_OFFS,
+	NLMSGERR_ATTR_ATTR,
+
+	NUM_NLMSGERR_ATTRS,
+	NLMSGERR_ATTR_MAX = NUM_NLMSGERR_ATTRS - 1
 };
 
 #define NETLINK_ADD_MEMBERSHIP		1
@@ -115,6 +143,7 @@ struct nlmsgerr {
 #define NETLINK_LISTEN_ALL_NSID		8
 #define NETLINK_LIST_MEMBERSHIPS	9
 #define NETLINK_CAP_ACK			10
+#define NETLINK_EXT_ACK			11
 
 struct nl_pktinfo {
 	__u32	group;
diff --git a/kernel/audit.c b/kernel/audit.c
index 2f4964cfde0b..d54bf5932374 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1402,7 +1402,7 @@ static void audit_receive_skb(struct sk_buff *skb)
 		err = audit_receive_msg(skb, nlh);
 		/* if err or if this message says it wants a response */
 		if (err || (nlh->nlmsg_flags & NLM_F_ACK))
-			netlink_ack(skb, nlh, err);
+			netlink_ack(skb, nlh, err, NULL);
 
 		nlh = nlmsg_next(nlh, &len);
 	}
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index b2bd4c9ee860..9788147241f4 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4120,7 +4120,8 @@ static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
 
 /* Process one rtnetlink message. */
 
-static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
+			     struct netlink_ext_ack *extack)
 {
 	struct net *net = sock_net(skb->sk);
 	rtnl_doit_func doit;
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index fb9d0e2fd148..217f4e3b82f6 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -238,7 +238,8 @@ static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
 	return err;
 }
 
-static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
+			     struct netlink_ext_ack *extack)
 {
 	int ret;
 
diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c
index 85f2fdc360c2..c8bf5136a72b 100644
--- a/net/decnet/netfilter/dn_rtmsg.c
+++ b/net/decnet/netfilter/dn_rtmsg.c
@@ -96,7 +96,7 @@ static unsigned int dnrmg_hook(void *priv,
 }
 
 
-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err), NULL); return; } while (0)
 
 static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
 {
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index 1ab30e7d3f99..81dac16933fc 100644
--- a/net/hsr/hsr_netlink.c
+++ b/net/hsr/hsr_netlink.c
@@ -350,7 +350,7 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
 	return 0;
 
 invalid:
-	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
+	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
 	return 0;
 
 nla_put_failure:
@@ -432,7 +432,7 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
 	return 0;
 
 invalid:
-	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
+	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
 	return 0;
 
 nla_put_failure:
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index c296f9b606d4..26356bf8cebf 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -1305,7 +1305,7 @@ ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb)
 			 * manually :-(
 			 */
 			if (nlh->nlmsg_flags & NLM_F_ACK)
-				netlink_ack(cb->skb, nlh, ret);
+				netlink_ack(cb->skb, nlh, ret, NULL);
 			return ret;
 		}
 	}
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 68eda920160e..181d3bb800e6 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -148,7 +148,8 @@ int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid,
 EXPORT_SYMBOL_GPL(nfnetlink_unicast);
 
 /* Process one complete nfnetlink message. */
-static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
+			     struct netlink_ext_ack *extack)
 {
 	struct net *net = sock_net(skb->sk);
 	const struct nfnl_callback *nc;
@@ -261,7 +262,7 @@ static void nfnl_err_deliver(struct list_head *err_list, struct sk_buff *skb)
 	struct nfnl_err *nfnl_err, *next;
 
 	list_for_each_entry_safe(nfnl_err, next, err_list, head) {
-		netlink_ack(skb, nfnl_err->nlh, nfnl_err->err);
+		netlink_ack(skb, nfnl_err->nlh, nfnl_err->err, NULL);
 		nfnl_err_del(nfnl_err);
 	}
 }
@@ -284,13 +285,13 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 	int err;
 
 	if (subsys_id >= NFNL_SUBSYS_COUNT)
-		return netlink_ack(skb, nlh, -EINVAL);
+		return netlink_ack(skb, nlh, -EINVAL, NULL);
 replay:
 	status = 0;
 
 	skb = netlink_skb_clone(oskb, GFP_KERNEL);
 	if (!skb)
-		return netlink_ack(oskb, nlh, -ENOMEM);
+		return netlink_ack(oskb, nlh, -ENOMEM, NULL);
 
 	nfnl_lock(subsys_id);
 	ss = nfnl_dereference_protected(subsys_id);
@@ -304,20 +305,20 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 #endif
 		{
 			nfnl_unlock(subsys_id);
-			netlink_ack(oskb, nlh, -EOPNOTSUPP);
+			netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
 			return kfree_skb(skb);
 		}
 	}
 
 	if (!ss->commit || !ss->abort) {
 		nfnl_unlock(subsys_id);
-		netlink_ack(oskb, nlh, -EOPNOTSUPP);
+		netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
 		return kfree_skb(skb);
 	}
 
 	if (genid && ss->valid_genid && !ss->valid_genid(net, genid)) {
 		nfnl_unlock(subsys_id);
-		netlink_ack(oskb, nlh, -ERESTART);
+		netlink_ack(oskb, nlh, -ERESTART, NULL);
 		return kfree_skb(skb);
 	}
 
@@ -407,7 +408,8 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 				 * pointing to the batch header.
 				 */
 				nfnl_err_reset(&err_list);
-				netlink_ack(oskb, nlmsg_hdr(oskb), -ENOMEM);
+				netlink_ack(oskb, nlmsg_hdr(oskb), -ENOMEM,
+					    NULL);
 				status |= NFNL_BATCH_FAILURE;
 				goto done;
 			}
@@ -467,7 +469,7 @@ static void nfnetlink_rcv_skb_batch(struct sk_buff *skb, struct nlmsghdr *nlh)
 
 	err = nla_parse(cda, NFNL_BATCH_MAX, attr, attrlen, nfnl_batch_policy);
 	if (err < 0) {
-		netlink_ack(skb, nlh, err);
+		netlink_ack(skb, nlh, err, NULL);
 		return;
 	}
 	if (cda[NFNL_BATCH_GENID])
@@ -493,7 +495,7 @@ static void nfnetlink_rcv(struct sk_buff *skb)
 		return;
 
 	if (!netlink_net_capable(skb, CAP_NET_ADMIN)) {
-		netlink_ack(skb, nlh, -EPERM);
+		netlink_ack(skb, nlh, -EPERM, NULL);
 		return;
 	}
 
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index fc232441cf23..c74f56a4fcf1 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1652,6 +1652,13 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
 			nlk->flags &= ~NETLINK_F_CAP_ACK;
 		err = 0;
 		break;
+	case NETLINK_EXT_ACK:
+		if (val)
+			nlk->flags |= NETLINK_F_EXT_ACK;
+		else
+			nlk->flags &= ~NETLINK_F_EXT_ACK;
+		err = 0;
+		break;
 	default:
 		err = -ENOPROTOOPT;
 	}
@@ -1736,6 +1743,16 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
 			return -EFAULT;
 		err = 0;
 		break;
+	case NETLINK_EXT_ACK:
+		if (len < sizeof(int))
+			return -EINVAL;
+		len = sizeof(int);
+		val = nlk->flags & NETLINK_F_EXT_ACK ? 1 : 0;
+		if (put_user(len, optlen) ||
+		    put_user(val, optval))
+			return -EFAULT;
+		err = 0;
+		break;
 	default:
 		err = -ENOPROTOOPT;
 	}
@@ -2267,21 +2284,36 @@ int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
 }
 EXPORT_SYMBOL(__netlink_dump_start);
 
-void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
+void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
+		 const struct netlink_ext_ack *extack)
 {
 	struct sk_buff *skb;
 	struct nlmsghdr *rep;
 	struct nlmsgerr *errmsg;
 	size_t payload = sizeof(*errmsg);
+	size_t acksize = sizeof(*errmsg);
 	struct netlink_sock *nlk = nlk_sk(NETLINK_CB(in_skb).sk);
 
 	/* Error messages get the original request appened, unless the user
-	 * requests to cap the error message.
+	 * requests to cap the error message, and get extra error data if
+	 * requested.
 	 */
-	if (!(nlk->flags & NETLINK_F_CAP_ACK) && err)
-		payload += nlmsg_len(nlh);
+	if (err) {
+		if (!(nlk->flags & NETLINK_F_CAP_ACK))
+			payload += nlmsg_len(nlh);
+		acksize = payload;
+		if (nlk->flags & NETLINK_F_EXT_ACK && extack) {
+			if (extack->_msg)
+				acksize +=
+					nla_total_size(strlen(extack->_msg) + 1);
+			if (extack->bad_attr)
+				acksize += nla_total_size(sizeof(u32));
+			if (extack->missing_attr)
+				acksize += nla_total_size(sizeof(u16));
+		}
+	}
 
-	skb = nlmsg_new(payload, GFP_KERNEL);
+	skb = nlmsg_new(acksize, GFP_KERNEL);
 	if (!skb) {
 		struct sock *sk;
 
@@ -2300,14 +2332,35 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
 			  NLMSG_ERROR, payload, 0);
 	errmsg = nlmsg_data(rep);
 	errmsg->error = err;
-	memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh->nlmsg_len : sizeof(*nlh));
+	memcpy(&errmsg->msg, nlh,
+	       !(nlk->flags & NETLINK_F_CAP_ACK) ? nlh->nlmsg_len
+						 : sizeof(*nlh));
+
+	if (err && nlk->flags & NETLINK_F_EXT_ACK && extack) {
+		if (extack->_msg)
+			WARN_ON(nla_put_string(skb, NLMSGERR_ATTR_MSG,
+					       extack->_msg));
+		if (extack->bad_attr &&
+		    !WARN_ON((u8 *)extack->bad_attr < in_skb->data ||
+			     (u8 *)extack->bad_attr >= in_skb->data +
+						       in_skb->len))
+			WARN_ON(nla_put_u32(skb, NLMSGERR_ATTR_OFFS,
+					    (u8 *)extack->bad_attr -
+					    in_skb->data));
+		if (extack->missing_attr)
+			WARN_ON(nla_put_u16(skb, NLMSGERR_ATTR_ATTR,
+					    extack->missing_attr));
+	}
+
 	netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT);
 }
 EXPORT_SYMBOL(netlink_ack);
 
 int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
-						     struct nlmsghdr *))
+						   struct nlmsghdr *,
+						   struct netlink_ext_ack *))
 {
+	struct netlink_ext_ack extack = {};
 	struct nlmsghdr *nlh;
 	int err;
 
@@ -2328,13 +2381,13 @@ int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
 		if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
 			goto ack;
 
-		err = cb(skb, nlh);
+		err = cb(skb, nlh, &extack);
 		if (err == -EINTR)
 			goto skip;
 
 ack:
 		if (nlh->nlmsg_flags & NLM_F_ACK || err)
-			netlink_ack(skb, nlh, err);
+			netlink_ack(skb, nlh, err, &extack);
 
 skip:
 		msglen = NLMSG_ALIGN(nlh->nlmsg_len);
diff --git a/net/netlink/af_netlink.h b/net/netlink/af_netlink.h
index f792f8d7f982..3490f2430532 100644
--- a/net/netlink/af_netlink.h
+++ b/net/netlink/af_netlink.h
@@ -13,6 +13,7 @@
 #define NETLINK_F_RECV_NO_ENOBUFS	0x8
 #define NETLINK_F_LISTEN_ALL_NSID	0x10
 #define NETLINK_F_CAP_ACK		0x20
+#define NETLINK_F_EXT_ACK		0x40
 
 #define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
 #define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 92e0981f7404..57b2e3648bc0 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -605,7 +605,8 @@ static int genl_family_rcv_msg(const struct genl_family *family,
 	return err;
 }
 
-static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
+			struct netlink_ext_ack *extack)
 {
 	const struct genl_family *family;
 	int err;
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 40a8aa39220d..1ba8c115a993 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2448,7 +2448,8 @@ static const struct xfrm_link {
 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
 };
 
-static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
+			     struct netlink_ext_ack *extack)
 {
 	struct net *net = sock_net(skb->sk);
 	struct nlattr *attrs[XFRMA_MAX+1];
-- 
2.11.0

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[David Ahern]

On 4/8/17 2:24 PM, Johannes Berg wrote:
> @@ -2300,14 +2332,35 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
>  			  NLMSG_ERROR, payload, 0);
>  	errmsg = nlmsg_data(rep);
>  	errmsg->error = err;
> -	memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh->nlmsg_len : sizeof(*nlh));
> +	memcpy(&errmsg->msg, nlh,
> +	       !(nlk->flags & NETLINK_F_CAP_ACK) ? nlh->nlmsg_len
> +						 : sizeof(*nlh));
> +

generically this makes userspace parsing more problematic: the parsing
layer may not know if the socket option has been set to precisely know
the size of errmsg->msg and how much data needs to be skipped to get to
the new attributes.

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[Johannes Berg]

On Mon, 2017-04-10 at 09:26 -0600, David Ahern wrote:
> On 4/8/17 2:24 PM, Johannes Berg wrote:
> > @@ -2300,14 +2332,35 @@ void netlink_ack(struct sk_buff *in_skb,
> > struct nlmsghdr *nlh, int err)
> >  			  NLMSG_ERROR, payload, 0);
> >  	errmsg = nlmsg_data(rep);
> >  	errmsg->error = err;
> > -	memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh-
> > >nlmsg_len : sizeof(*nlh));
> > +	memcpy(&errmsg->msg, nlh,
> > +	       !(nlk->flags & NETLINK_F_CAP_ACK) ? nlh->nlmsg_len
> > +						 : sizeof(*nlh));
> > +
> 
> generically this makes userspace parsing more problematic: the
> parsing layer may not know if the socket option has been set to
> precisely know the size of errmsg->msg and how much data needs to be
> skipped to get to the new attributes.

Yes, I know. I'd hope that userspace can remember that per socket - I
don't see a good other way to do this.

If we insert the TLVs in front of, or instead of (with a TLV containing
it), the request message then at least libnl's debugging will need to
be changed.

As it is, I can assume that libnl will not set the CAP setting, and
everything works fine even if I don't change libnl, which makes things
easier.

Do you have any better ideas?

johannes

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[David Ahern]

On 4/10/17 9:30 AM, Johannes Berg wrote:
> On Mon, 2017-04-10 at 09:26 -0600, David Ahern wrote:
>> On 4/8/17 2:24 PM, Johannes Berg wrote:
>>> @@ -2300,14 +2332,35 @@ void netlink_ack(struct sk_buff *in_skb,
>>> struct nlmsghdr *nlh, int err)
>>>  			  NLMSG_ERROR, payload, 0);
>>>  	errmsg = nlmsg_data(rep);
>>>  	errmsg->error = err;
>>> -	memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh-
>>>> nlmsg_len : sizeof(*nlh));
>>> +	memcpy(&errmsg->msg, nlh,
>>> +	       !(nlk->flags & NETLINK_F_CAP_ACK) ? nlh->nlmsg_len
>>> +						 : sizeof(*nlh));
>>> +
>>
>> generically this makes userspace parsing more problematic: the
>> parsing layer may not know if the socket option has been set to
>> precisely know the size of errmsg->msg and how much data needs to be
>> skipped to get to the new attributes.
> 
> Yes, I know. I'd hope that userspace can remember that per socket - I
> don't see a good other way to do this.
> 
> If we insert the TLVs in front of, or instead of (with a TLV containing
> it), the request message then at least libnl's debugging will need to
> be changed.
> 
> As it is, I can assume that libnl will not set the CAP setting, and
> everything works fine even if I don't change libnl, which makes things
> easier.
> 
> Do you have any better ideas?

NETLINK_F_CAP_ACK and NETLINK_F_EXT_ACK should be incompatible -- if one
is set the other can not be set. CAP_ACK means abbreviate the response
and EXT_ACK means give me more data.

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[Johannes Berg]

On Mon, 2017-04-10 at 09:35 -0600, David Ahern wrote:

> > Do you have any better ideas?
> 
> NETLINK_F_CAP_ACK and NETLINK_F_EXT_ACK should be incompatible -- if
> one is set the other can not be set. CAP_ACK means abbreviate the
> response and EXT_ACK means give me more data.

So you mean if I want EXT_ACK I cannot also cap the message?

I guess that's doable, but again wouldn't it hurt applications that
want to use CAP? I assume every application wants to use EXT_ACK
eventually, and those that use CAP right now wouldn't be able to.

Another thought: if we add a new flag that indicates "message has been
capped", which we introduce in this same patch, then we can disentangle
this more easily, right?

Adding a new flag for "TLVs present" won't really help, but if you know
the message was capped then you know the TLVs start after the inner
nlmsghdr and you ignore that header's nlmsg_len.

johannes

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[Johannes Berg]

On Mon, 2017-04-10 at 17:40 +0200, Johannes Berg wrote:
> 
> Another thought: if we add a new flag that indicates "message has
> been capped", which we introduce in this same patch, then we can
> disentangle this more easily, right?
> 
> Adding a new flag for "TLVs present" won't really help, but if you
> know the message was capped then you know the TLVs start after the
> inner nlmsghdr and you ignore that header's nlmsg_len.

Actually, the flag should be set if (and only if) the message was
capped *and* TLVs were requested (or present, doesn't matter.)

That way it becomes completely backward compatible and stateless:
 * on kernels that don't have extack you can ignore the setsockopt
   failure
 * checking if TLVs are present becomes
   flag set ||
   nlh->nlmsg_len > sizeof(*nlh) + sizeof(int) +
                    sizeof(*inner_nlh) + inner_nlh->nlmsg_len
 * TLV start offset is
   tlv_start_offs = sizeof(*nlh) + sizeof(int) + sizeof(inner_nlh)
   if (flag set)
       tlv_start_offs += inner_nlh->nlmsg_len

I need to resend anyway so I'll add that tomorrow.

johannes

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[Pablo Neira Ayuso]

On Mon, Apr 10, 2017 at 09:35:27AM -0600, David Ahern wrote:
> On 4/10/17 9:30 AM, Johannes Berg wrote:
> > On Mon, 2017-04-10 at 09:26 -0600, David Ahern wrote:
> >> On 4/8/17 2:24 PM, Johannes Berg wrote:
> >>> @@ -2300,14 +2332,35 @@ void netlink_ack(struct sk_buff *in_skb,
> >>> struct nlmsghdr *nlh, int err)
> >>>  			  NLMSG_ERROR, payload, 0);
> >>>  	errmsg = nlmsg_data(rep);
> >>>  	errmsg->error = err;
> >>> -	memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh-
> >>>> nlmsg_len : sizeof(*nlh));
> >>> +	memcpy(&errmsg->msg, nlh,
> >>> +	       !(nlk->flags & NETLINK_F_CAP_ACK) ? nlh->nlmsg_len
> >>> +						 : sizeof(*nlh));
> >>> +
> >>
> >> generically this makes userspace parsing more problematic: the
> >> parsing layer may not know if the socket option has been set to
> >> precisely know the size of errmsg->msg and how much data needs to be
> >> skipped to get to the new attributes.
> > 
> > Yes, I know. I'd hope that userspace can remember that per socket - I
> > don't see a good other way to do this.
> > 
> > If we insert the TLVs in front of, or instead of (with a TLV containing
> > it), the request message then at least libnl's debugging will need to
> > be changed.
> > 
> > As it is, I can assume that libnl will not set the CAP setting, and
> > everything works fine even if I don't change libnl, which makes things
> > easier.
> > 
> > Do you have any better ideas?
> 
> NETLINK_F_CAP_ACK and NETLINK_F_EXT_ACK should be incompatible -- if one
> is set the other can not be set. CAP_ACK means abbreviate the response
> and EXT_ACK means give me more data.

CAP_ACK means: trim off the payload that the netlink error message
is embedding, just like ICMP error does.

What is exactly your concern? If the user explicitly requests this via
socket option for this socket, then we're expecting they do the right
handling for what they're asking for.

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[Johannes Berg]

On Tue, 2017-04-11 at 08:59 +0200, Pablo Neira Ayuso wrote:
> CAP_ACK means: trim off the payload that the netlink error message
> is embedding, just like ICMP error does.
> 
> What is exactly your concern? If the user explicitly requests this
> via socket option for this socket, then we're expecting they do the
> right handling for what they're asking for.

I think David's concern was that when you want to parse the ACK in a
library (or application), you may not easily know if the application
(or library) requested capping.

I've addressed this by adding two new flags now, though the CAPPED flag
can only be relied on when the TLVS flag is present, but that's the
only case where you care anyway. I felt that we had enough space to
spend two bits rather than one, in order to not have to rely on any
length calculations to see if TLVs are present - as I'd suggested in my
email last night.

johannes

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[David Ahern]

On 4/11/17 1:02 AM, Johannes Berg wrote:
> On Tue, 2017-04-11 at 08:59 +0200, Pablo Neira Ayuso wrote:
>> CAP_ACK means: trim off the payload that the netlink error message
>> is embedding, just like ICMP error does.
>>
>> What is exactly your concern? If the user explicitly requests this
>> via socket option for this socket, then we're expecting they do the
>> right handling for what they're asking for.
> 
> I think David's concern was that when you want to parse the ACK in a
> library (or application), you may not easily know if the application
> (or library) requested capping.

exactly.

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[Pablo Neira Ayuso]

On Tue, Apr 11, 2017 at 08:25:57AM -0600, David Ahern wrote:
> On 4/11/17 1:02 AM, Johannes Berg wrote:
> > On Tue, 2017-04-11 at 08:59 +0200, Pablo Neira Ayuso wrote:
> >> CAP_ACK means: trim off the payload that the netlink error message
> >> is embedding, just like ICMP error does.
> >>
> >> What is exactly your concern? If the user explicitly requests this
> >> via socket option for this socket, then we're expecting they do the
> >> right handling for what they're asking for.
> > 
> > I think David's concern was that when you want to parse the ACK in a
> > library (or application), you may not easily know if the application
> > (or library) requested capping.
> 
> exactly.

Then, the library needs to be extended to enable this handling to
modify the way it needs to handle errors, together with the
setsockopt().

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 11 Apr 2017 19:31:43 +0200

> On Tue, Apr 11, 2017 at 08:25:57AM -0600, David Ahern wrote:
>> On 4/11/17 1:02 AM, Johannes Berg wrote:
>> > On Tue, 2017-04-11 at 08:59 +0200, Pablo Neira Ayuso wrote:
>> >> CAP_ACK means: trim off the payload that the netlink error message
>> >> is embedding, just like ICMP error does.
>> >>
>> >> What is exactly your concern? If the user explicitly requests this
>> >> via socket option for this socket, then we're expecting they do the
>> >> right handling for what they're asking for.
>> > 
>> > I think David's concern was that when you want to parse the ACK in a
>> > library (or application), you may not easily know if the application
>> > (or library) requested capping.
>> 
>> exactly.
> 
> Then, the library needs to be extended to enable this handling to
> modify the way it needs to handle errors, together with the
> setsockopt().

That's my take on this.

If there are libraries where there is a disconnect between the thing
that controls the sending of the netlink request from the processing
of the netlink response, that really is their problem to work out.

If they wish to support extended ACK reports, they will need to
sort those details out.

If there is sharing of a newlink socket between different libraries,
each wanting to operate in a different mode, that isn't all that
reasonable to me.  Often libraries can't even agree on whether they
want to use a socket fd in non-blocking vs. blocking mode.

David, if you have a specific case where it's absolutely impossible
to resolve this when the library is converted to support extended
ACKs, please mention it.

Thanks.

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[David Ahern]

On 4/11/17 11:42 AM, David Miller wrote:
> David, if you have a specific case where it's absolutely impossible
> to resolve this when the library is converted to support extended
> ACKs, please mention it.

I don't have a specific library in mind. It is more the disjoint nature
of a socket option and message parsing, and thinking through the API.

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[David Miller]

From: David Ahern <dsa@cumulusnetworks.com>
Date: Tue, 11 Apr 2017 12:57:59 -0600

> On 4/11/17 11:42 AM, David Miller wrote:
>> David, if you have a specific case where it's absolutely impossible
>> to resolve this when the library is converted to support extended
>> ACKs, please mention it.
> 
> I don't have a specific library in mind. It is more the disjoint nature
> of a socket option and message parsing, and thinking through the API.

Would you prefer it being passed via a control message at sendmsg()
time?  That would require more changes to userland programs, and also
increase the per-request overhead in the kernel as it parses this CMSG
every single time.

We have a setsockopt for AF_PACKET that changes the entire layout of
the packet mmap ring, nobody complains that libraries are hard to
implement because of that right?

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[David Ahern]

On 4/11/17 1:05 PM, David Miller wrote:
> From: David Ahern <dsa@cumulusnetworks.com>
> Date: Tue, 11 Apr 2017 12:57:59 -0600
> 
>> On 4/11/17 11:42 AM, David Miller wrote:
>>> David, if you have a specific case where it's absolutely impossible
>>> to resolve this when the library is converted to support extended
>>> ACKs, please mention it.
>>
>> I don't have a specific library in mind. It is more the disjoint nature
>> of a socket option and message parsing, and thinking through the API.
> 
> Would you prefer it being passed via a control message at sendmsg()
> time?  That would require more changes to userland programs, and also
> increase the per-request overhead in the kernel as it parses this CMSG
> every single time.

Johannes' v4 adds a flag in the response that the parser can use to
definitely know the size of the errmsg.msg that was returned. That seems
sufficient to me. Did you disagree with that suggestion?

Re: [PATCH v3 1/5] netlink: extended ACK reporting

[Johannes Berg]

On Tue, 2017-04-11 at 13:42 -0400, David Miller wrote:

> > Then, the library needs to be extended to enable this handling to
> > modify the way it needs to handle errors, together with the
> > setsockopt().

So I'd tend to agree, but

 * it was easy to solve this, with the flags I added
 * the flags reduce the amount of parsing dependencies, for example, it
   is then no longer necessary to check if error == 0 to know if the
   message was capped or not (when not requested), since the flag
   indicates it
 * having the flag that TLVs were set lets us not store if the
   setsockopt failed or not - this can be useful in the error report
   case (but not in the success/cookie case) since it avoids extra
   state that needs to be passed around
 * libnl, which seems pretty common, allows just passing a single
   pointer around as state, which is often already used for something
   else, meaning a bigger refactoring can be required to pass the extra
   state

So yes, in theory we don't need this, but in practice it does make the
userland parsing code quite a bit easier.

johannes

[PATCH v3 2/5] genetlink: pass extended ACK report down

[Johannes Berg]

From: Johannes Berg <johannes.berg@intel.com>

Pass the extended ACK reporting struct down from
generic netlink to the families, using the existing
struct genl_info for simplicity.

Also add support to set the extended ACK information
from generic netlink users.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 include/net/genetlink.h | 20 ++++++++++++++++++++
 net/netlink/genetlink.c |  6 ++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index a34275be3600..b81a4979e1db 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -84,6 +84,7 @@ struct nlattr **genl_family_attrbuf(const struct genl_family *family);
  * @attrs: netlink attributes
  * @_net: network namespace
  * @user_ptr: user pointers
+ * @extack: extended ACK report struct
  */
 struct genl_info {
 	u32			snd_seq;
@@ -94,6 +95,7 @@ struct genl_info {
 	struct nlattr **	attrs;
 	possible_net_t		_net;
 	void *			user_ptr[2];
+	struct netlink_ext_ack *extack;
 };
 
 static inline struct net *genl_info_net(struct genl_info *info)
@@ -106,6 +108,24 @@ static inline void genl_info_net_set(struct genl_info *info, struct net *net)
 	write_pnet(&info->_net, net);
 }
 
+#define GENL_SET_ERR_MSG(info, msg) NL_SET_ERR_MSG((info)->extack, msg)
+
+static inline int genl_err_attr(struct genl_info *info, int err,
+				struct nlattr *attr)
+{
+	info->extack->bad_attr = attr;
+
+	return err;
+}
+
+static inline int genl_err_attr_missing(struct genl_info *info, int err,
+					u16 attr)
+{
+	info->extack->missing_attr = attr;
+
+	return err;
+}
+
 /**
  * struct genl_ops - generic netlink operations
  * @cmd: command identifier
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 57b2e3648bc0..4b598a5999a2 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -497,7 +497,8 @@ static int genl_lock_done(struct netlink_callback *cb)
 
 static int genl_family_rcv_msg(const struct genl_family *family,
 			       struct sk_buff *skb,
-			       struct nlmsghdr *nlh)
+			       struct nlmsghdr *nlh,
+			       struct netlink_ext_ack *extack)
 {
 	const struct genl_ops *ops;
 	struct net *net = sock_net(skb->sk);
@@ -584,6 +585,7 @@ static int genl_family_rcv_msg(const struct genl_family *family,
 	info.genlhdr = nlmsg_data(nlh);
 	info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
 	info.attrs = attrbuf;
+	info.extack = extack;
 	genl_info_net_set(&info, net);
 	memset(&info.user_ptr, 0, sizeof(info.user_ptr));
 
@@ -618,7 +620,7 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (!family->parallel_ops)
 		genl_lock();
 
-	err = genl_family_rcv_msg(family, skb, nlh);
+	err = genl_family_rcv_msg(family, skb, nlh, extack);
 
 	if (!family->parallel_ops)
 		genl_unlock();
-- 
2.11.0

[PATCH v3 3/5] netlink: allow sending extended ACK with cookie on success

[Johannes Berg]

From: Johannes Berg <johannes.berg@intel.com>

Now that we have extended error reporting and a new message format
for netlink ACK messages, also extend this to be able to return
arbitrary cookie data on success.

This will allow, for example, nl80211 to not send an extra message
for cookies identifying newly created objects, but return those
directly in the ACK message.

The cookie data size is currently limited to 20 bytes (since Jamal
talked about using SHA1 for identifiers.)

Thanks to Jamal Hadi Salim for bringing up this idea during the
discussions.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 include/linux/netlink.h      |  7 +++++++
 include/uapi/linux/netlink.h |  4 ++++
 net/netlink/af_netlink.c     | 38 ++++++++++++++++++++++++--------------
 3 files changed, 35 insertions(+), 14 deletions(-)

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 746359c27396..4bf13bb725ea 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -62,17 +62,24 @@ netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
 	return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
 }
 
+/* this can be increased when necessary - don't expose to userland */
+#define NETLINK_MAX_COOKIE_LEN	20
+
 /**
  * struct netlink_ext_ack - netlink extended ACK report struct
  * @_msg: message string to report - don't access directly, use
  *	%NL_SET_ERR_MSG
  * @bad_attr: attribute with error
  * @missing_attr: number of missing attr (or 0)
+ * @cookie: cookie data to return to userspace (for success)
+ * @cookie_len: actual cookie data length
  */
 struct netlink_ext_ack {
 	const char *_msg;
 	const struct nlattr *bad_attr;
 	u16 missing_attr;
+	u8 cookie[NETLINK_MAX_COOKIE_LEN];
+	u8 cookie_len;
 };
 
 /* Always use this macro, this allows later putting the
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
index 5f1a48b140c8..26625355ac97 100644
--- a/include/uapi/linux/netlink.h
+++ b/include/uapi/linux/netlink.h
@@ -118,6 +118,9 @@ struct nlmsgerr {
  * @NLMSGERR_ATTR_OFFS: error offset in the original message (u32)
  * @NLMSGERR_ATTR_ATTR: top-level attribute that caused the error
  *	(or is missing, u16)
+ * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to
+ *	be used - in the success case - to identify a created
+ *	object or operation or similar (binary)
  * @NUM_NLMSGERR_ATTRS: number of attributes
  * @NLMSGERR_ATTR_MAX: highest attribute number
  */
@@ -126,6 +129,7 @@ enum nlmsgerr_attrs {
 	NLMSGERR_ATTR_MSG,
 	NLMSGERR_ATTR_OFFS,
 	NLMSGERR_ATTR_ATTR,
+	NLMSGERR_ATTR_COOKIE,
 
 	NUM_NLMSGERR_ATTRS,
 	NLMSGERR_ATTR_MAX = NUM_NLMSGERR_ATTRS - 1
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index c74f56a4fcf1..78f33b8011d2 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2311,6 +2311,9 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
 			if (extack->missing_attr)
 				acksize += nla_total_size(sizeof(u16));
 		}
+	} else if (nlk->flags & NETLINK_F_EXT_ACK) {
+		if (extack && extack->cookie_len)
+			acksize += nla_total_size(extack->cookie_len);
 	}
 
 	skb = nlmsg_new(acksize, GFP_KERNEL);
@@ -2336,20 +2339,27 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
 	       !(nlk->flags & NETLINK_F_CAP_ACK) ? nlh->nlmsg_len
 						 : sizeof(*nlh));
 
-	if (err && nlk->flags & NETLINK_F_EXT_ACK && extack) {
-		if (extack->_msg)
-			WARN_ON(nla_put_string(skb, NLMSGERR_ATTR_MSG,
-					       extack->_msg));
-		if (extack->bad_attr &&
-		    !WARN_ON((u8 *)extack->bad_attr < in_skb->data ||
-			     (u8 *)extack->bad_attr >= in_skb->data +
-						       in_skb->len))
-			WARN_ON(nla_put_u32(skb, NLMSGERR_ATTR_OFFS,
-					    (u8 *)extack->bad_attr -
-					    in_skb->data));
-		if (extack->missing_attr)
-			WARN_ON(nla_put_u16(skb, NLMSGERR_ATTR_ATTR,
-					    extack->missing_attr));
+	if (nlk->flags & NETLINK_F_EXT_ACK && extack) {
+		if (err) {
+			if (extack->_msg)
+				WARN_ON(nla_put_string(skb, NLMSGERR_ATTR_MSG,
+						       extack->_msg));
+			if (extack->bad_attr &&
+			    !WARN_ON((u8 *)extack->bad_attr < in_skb->data ||
+				     (u8 *)extack->bad_attr >= in_skb->data +
+							       in_skb->len))
+				WARN_ON(nla_put_u32(skb, NLMSGERR_ATTR_OFFS,
+						    (u8 *)extack->bad_attr -
+						    in_skb->data));
+			if (extack->missing_attr)
+				WARN_ON(nla_put_u16(skb, NLMSGERR_ATTR_ATTR,
+						    extack->missing_attr));
+		} else {
+			if (extack->cookie_len)
+				WARN_ON(nla_put(skb, NLMSGERR_ATTR_COOKIE,
+						extack->cookie_len,
+						extack->cookie));
+		}
 	}
 
 	netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT);
-- 
2.11.0

[PATCH v3 4/5] netlink: pass extended ACK struct to parsing functions

[Johannes Berg]

From: Johannes Berg <johannes.berg@intel.com>

Pass the new extended ACK reporting struct to all of the
generic netlink parsing functions. For now, pass NULL in
almost all callers (except for some in the core.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 crypto/crypto_user.c                              |  2 +-
 drivers/block/drbd/drbd_nla.c                     |  2 +-
 drivers/infiniband/core/addr.c                    |  2 +-
 drivers/infiniband/core/iwpm_util.c               |  6 +-
 drivers/infiniband/core/sa_query.c                |  4 +-
 drivers/net/macsec.c                              | 10 +--
 drivers/net/team/team.c                           |  2 +-
 drivers/net/veth.c                                |  3 +-
 drivers/net/wireless/ath/ath10k/testmode.c        |  4 +-
 drivers/net/wireless/ath/ath6kl/testmode.c        |  4 +-
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c |  3 +-
 drivers/net/wireless/mac80211_hwsim.c             |  4 +-
 drivers/net/wireless/marvell/mwifiex/cfg80211.c   |  4 +-
 drivers/net/wireless/ti/wlcore/testmode.c         |  3 +-
 drivers/net/wireless/ti/wlcore/vendor_cmd.c       |  4 +-
 include/net/genetlink.h                           |  8 ++-
 include/net/netlink.h                             | 33 +++++++---
 include/net/rtnetlink.h                           |  3 +-
 lib/nlattr.c                                      | 28 +++++---
 net/8021q/vlan_netlink.c                          |  3 +-
 net/bridge/br_mdb.c                               |  3 +-
 net/bridge/br_netlink.c                           |  4 +-
 net/bridge/br_netlink_tunnel.c                    |  4 +-
 net/can/gw.c                                      |  2 +-
 net/core/fib_rules.c                              |  4 +-
 net/core/lwt_bpf.c                                |  5 +-
 net/core/neighbour.c                              |  8 +--
 net/core/net_namespace.c                          |  4 +-
 net/core/rtnetlink.c                              | 47 ++++++++------
 net/dcb/dcbnl.c                                   | 57 ++++++++---------
 net/decnet/dn_dev.c                               |  4 +-
 net/decnet/dn_fib.c                               |  6 +-
 net/decnet/dn_route.c                             |  2 +-
 net/ieee802154/nl802154.c                         | 29 ++++-----
 net/ipv4/devinet.c                                | 12 ++--
 net/ipv4/fib_frontend.c                           |  3 +-
 net/ipv4/ip_tunnel_core.c                         |  5 +-
 net/ipv4/ipmr.c                                   |  3 +-
 net/ipv4/route.c                                  |  3 +-
 net/ipv6/addrconf.c                               | 16 +++--
 net/ipv6/addrlabel.c                              |  4 +-
 net/ipv6/ila/ila_lwt.c                            |  3 +-
 net/ipv6/route.c                                  |  6 +-
 net/ipv6/seg6_iptunnel.c                          |  2 +-
 net/mpls/af_mpls.c                                |  5 +-
 net/mpls/mpls_iptunnel.c                          |  2 +-
 net/netfilter/ipset/ip_set_core.c                 | 27 ++++----
 net/netfilter/ipvs/ip_vs_ctl.c                    | 12 ++--
 net/netfilter/nf_conntrack_netlink.c              | 27 ++++----
 net/netfilter/nf_conntrack_proto_dccp.c           |  2 +-
 net/netfilter/nf_conntrack_proto_sctp.c           |  6 +-
 net/netfilter/nf_conntrack_proto_tcp.c            |  3 +-
 net/netfilter/nf_nat_core.c                       |  5 +-
 net/netfilter/nf_tables_api.c                     | 27 ++++----
 net/netfilter/nfnetlink.c                         | 11 ++--
 net/netfilter/nfnetlink_acct.c                    |  3 +-
 net/netfilter/nfnetlink_cthelper.c                | 12 ++--
 net/netfilter/nfnetlink_cttimeout.c               |  3 +-
 net/netfilter/nfnetlink_queue.c                   |  2 +-
 net/netfilter/nft_compat.c                        |  2 +-
 net/netlabel/netlabel_cipso_v4.c                  | 19 +++---
 net/netlink/genetlink.c                           |  2 +-
 net/nfc/netlink.c                                 |  5 +-
 net/openvswitch/datapath.c                        |  2 +-
 net/openvswitch/flow_netlink.c                    |  4 +-
 net/openvswitch/vport-vxlan.c                     |  3 +-
 net/phonet/pn_netlink.c                           |  6 +-
 net/qrtr/qrtr.c                                   |  2 +-
 net/sched/act_api.c                               | 20 +++---
 net/sched/act_bpf.c                               |  2 +-
 net/sched/act_connmark.c                          |  3 +-
 net/sched/act_csum.c                              |  2 +-
 net/sched/act_gact.c                              |  2 +-
 net/sched/act_ife.c                               |  4 +-
 net/sched/act_ipt.c                               |  2 +-
 net/sched/act_mirred.c                            |  2 +-
 net/sched/act_nat.c                               |  2 +-
 net/sched/act_pedit.c                             |  4 +-
 net/sched/act_police.c                            |  2 +-
 net/sched/act_sample.c                            |  2 +-
 net/sched/act_simple.c                            |  2 +-
 net/sched/act_skbedit.c                           |  2 +-
 net/sched/act_skbmod.c                            |  2 +-
 net/sched/act_tunnel_key.c                        |  3 +-
 net/sched/act_vlan.c                              |  2 +-
 net/sched/cls_api.c                               |  2 +-
 net/sched/cls_basic.c                             |  2 +-
 net/sched/cls_bpf.c                               |  3 +-
 net/sched/cls_cgroup.c                            |  2 +-
 net/sched/cls_flow.c                              |  2 +-
 net/sched/cls_flower.c                            |  3 +-
 net/sched/cls_fw.c                                |  2 +-
 net/sched/cls_matchall.c                          |  4 +-
 net/sched/cls_route.c                             |  2 +-
 net/sched/cls_rsvp.h                              |  2 +-
 net/sched/cls_tcindex.c                           |  2 +-
 net/sched/cls_u32.c                               |  2 +-
 net/sched/em_meta.c                               |  2 +-
 net/sched/ematch.c                                |  2 +-
 net/sched/sch_api.c                               | 10 +--
 net/sched/sch_atm.c                               |  2 +-
 net/sched/sch_cbq.c                               |  4 +-
 net/sched/sch_choke.c                             |  2 +-
 net/sched/sch_codel.c                             |  2 +-
 net/sched/sch_drr.c                               |  2 +-
 net/sched/sch_dsmark.c                            |  4 +-
 net/sched/sch_fq.c                                |  2 +-
 net/sched/sch_fq_codel.c                          |  3 +-
 net/sched/sch_gred.c                              |  4 +-
 net/sched/sch_hfsc.c                              |  2 +-
 net/sched/sch_hhf.c                               |  2 +-
 net/sched/sch_htb.c                               |  4 +-
 net/sched/sch_netem.c                             |  2 +-
 net/sched/sch_pie.c                               |  2 +-
 net/sched/sch_qfq.c                               |  3 +-
 net/sched/sch_red.c                               |  2 +-
 net/sched/sch_sfb.c                               |  2 +-
 net/sched/sch_tbf.c                               |  2 +-
 net/switchdev/switchdev.c                         |  2 +-
 net/tipc/bearer.c                                 | 14 ++--
 net/tipc/link.c                                   |  2 +-
 net/tipc/net.c                                    |  4 +-
 net/tipc/netlink.c                                |  3 +-
 net/tipc/netlink_compat.c                         | 32 +++++-----
 net/tipc/node.c                                   | 12 ++--
 net/tipc/socket.c                                 |  2 +-
 net/tipc/udp_media.c                              |  7 +-
 net/wireless/nl80211.c                            | 78 ++++++++++++-----------
 net/xfrm/xfrm_user.c                              |  6 +-
 129 files changed, 477 insertions(+), 391 deletions(-)

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 4a44830741c1..fc79906c1fe7 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -523,7 +523,7 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	}
 
 	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
-			  crypto_policy);
+			  crypto_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/drivers/block/drbd/drbd_nla.c b/drivers/block/drbd/drbd_nla.c
index b2d4791498a6..6bf806df60dc 100644
--- a/drivers/block/drbd/drbd_nla.c
+++ b/drivers/block/drbd/drbd_nla.c
@@ -34,7 +34,7 @@ int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
 
 	err = drbd_nla_check_mandatory(maxtype, nla);
 	if (!err)
-		err = nla_parse_nested(tb, maxtype, nla, policy);
+		err = nla_parse_nested(tb, maxtype, nla, policy, NULL);
 
 	return err;
 }
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 0f58f46dbad7..329d08c884f6 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -88,7 +88,7 @@ static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
 		return false;
 
 	ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
-			nlmsg_len(nlh), ib_nl_addr_policy);
+			nlmsg_len(nlh), ib_nl_addr_policy, NULL);
 	if (ret)
 		return false;
 
diff --git a/drivers/infiniband/core/iwpm_util.c b/drivers/infiniband/core/iwpm_util.c
index 3ef51a96bbf1..f13870e69ccd 100644
--- a/drivers/infiniband/core/iwpm_util.c
+++ b/drivers/infiniband/core/iwpm_util.c
@@ -472,12 +472,14 @@ int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 	int ret;
 	const char *err_str = "";
 
-	ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
+	ret = nlmsg_validate(cb->nlh, nlh_len, policy_max - 1, nlmsg_policy,
+			     NULL);
 	if (ret) {
 		err_str = "Invalid attribute";
 		goto parse_nlmsg_error;
 	}
-	ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
+	ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max - 1,
+			  nlmsg_policy, NULL);
 	if (ret) {
 		err_str = "Unable to parse the nlmsg";
 		goto parse_nlmsg_error;
diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index 81b742ca1639..ceae153997d0 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -808,7 +808,7 @@ int ib_nl_handle_set_timeout(struct sk_buff *skb,
 		return -EPERM;
 
 	ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
-			nlmsg_len(nlh), ib_nl_policy);
+			nlmsg_len(nlh), ib_nl_policy, NULL);
 	attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
 	if (ret || !attr)
 		goto settimeout_out;
@@ -860,7 +860,7 @@ static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
 		return 0;
 
 	ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
-			nlmsg_len(nlh), ib_nl_policy);
+			nlmsg_len(nlh), ib_nl_policy, NULL);
 	if (ret)
 		return 0;
 
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index ff0a5ed3ca80..9eb7a69be92a 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1590,8 +1590,9 @@ static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
 	if (!attrs[MACSEC_ATTR_SA_CONFIG])
 		return -EINVAL;
 
-	if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
-			     macsec_genl_sa_policy))
+	if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX,
+			     attrs[MACSEC_ATTR_SA_CONFIG],
+			     macsec_genl_sa_policy, NULL))
 		return -EINVAL;
 
 	return 0;
@@ -1602,8 +1603,9 @@ static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
 	if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
 		return -EINVAL;
 
-	if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
-			     macsec_genl_rxsc_policy))
+	if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX,
+			     attrs[MACSEC_ATTR_RXSC_CONFIG],
+			     macsec_genl_rxsc_policy, NULL))
 		return -EINVAL;
 
 	return 0;
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 1b52520715ae..86f227124ba1 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2471,7 +2471,7 @@ static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
 			goto team_put;
 		}
 		err = nla_parse_nested(opt_attrs, TEAM_ATTR_OPTION_MAX,
-				       nl_option, team_nl_option_policy);
+				       nl_option, team_nl_option_policy, NULL);
 		if (err)
 			goto team_put;
 		if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 317103680675..38f0f03a29c8 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -368,7 +368,8 @@ static int veth_newlink(struct net *src_net, struct net_device *dev,
 		ifmp = nla_data(nla_peer);
 		err = rtnl_nla_parse_ifla(peer_tb,
 					  nla_data(nla_peer) + sizeof(struct ifinfomsg),
-					  nla_len(nla_peer) - sizeof(struct ifinfomsg));
+					  nla_len(nla_peer) - sizeof(struct ifinfomsg),
+					  NULL);
 		if (err < 0)
 			return err;
 
diff --git a/drivers/net/wireless/ath/ath10k/testmode.c b/drivers/net/wireless/ath/ath10k/testmode.c
index 8bb36c18a749..d8564624415c 100644
--- a/drivers/net/wireless/ath/ath10k/testmode.c
+++ b/drivers/net/wireless/ath/ath10k/testmode.c
@@ -420,8 +420,8 @@ int ath10k_tm_cmd(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	struct nlattr *tb[ATH10K_TM_ATTR_MAX + 1];
 	int ret;
 
-	ret = nla_parse(tb, ATH10K_TM_ATTR_MAX, data, len,
-			ath10k_tm_policy);
+	ret = nla_parse(tb, ATH10K_TM_ATTR_MAX, data, len, ath10k_tm_policy,
+			NULL);
 	if (ret)
 		return ret;
 
diff --git a/drivers/net/wireless/ath/ath6kl/testmode.c b/drivers/net/wireless/ath/ath6kl/testmode.c
index d67170ea1038..d8dcacda9add 100644
--- a/drivers/net/wireless/ath/ath6kl/testmode.c
+++ b/drivers/net/wireless/ath/ath6kl/testmode.c
@@ -74,8 +74,8 @@ int ath6kl_tm_cmd(struct wiphy *wiphy, struct wireless_dev *wdev,
 	int err, buf_len;
 	void *buf;
 
-	err = nla_parse(tb, ATH6KL_TM_ATTR_MAX, data, len,
-			ath6kl_tm_policy);
+	err = nla_parse(tb, ATH6KL_TM_ATTR_MAX, data, len, ath6kl_tm_policy,
+			NULL);
 	if (err)
 		return err;
 
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 486dcceed17a..841bfdff8750 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -3711,7 +3711,8 @@ static int __iwl_mvm_mac_testmode_cmd(struct iwl_mvm *mvm,
 	int err;
 	u32 noa_duration;
 
-	err = nla_parse(tb, IWL_MVM_TM_ATTR_MAX, data, len, iwl_mvm_tm_policy);
+	err = nla_parse(tb, IWL_MVM_TM_ATTR_MAX, data, len, iwl_mvm_tm_policy,
+			NULL);
 	if (err)
 		return err;
 
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 50c219fb1a52..84a0e242ffdb 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -389,7 +389,7 @@ static int mac80211_hwsim_vendor_cmd_test(struct wiphy *wiphy,
 	u32 val;
 
 	err = nla_parse(tb, QCA_WLAN_VENDOR_ATTR_MAX, data, data_len,
-			hwsim_vendor_test_policy);
+			hwsim_vendor_test_policy, NULL);
 	if (err)
 		return err;
 	if (!tb[QCA_WLAN_VENDOR_ATTR_TEST])
@@ -1852,7 +1852,7 @@ static int mac80211_hwsim_testmode_cmd(struct ieee80211_hw *hw,
 	int err, ps;
 
 	err = nla_parse(tb, HWSIM_TM_ATTR_MAX, data, len,
-			hwsim_testmode_policy);
+			hwsim_testmode_policy, NULL);
 	if (err)
 		return err;
 
diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
index 1e3bd435a694..2d38f4a0aee3 100644
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -3997,8 +3997,8 @@ static int mwifiex_tm_cmd(struct wiphy *wiphy, struct wireless_dev *wdev,
 	if (!priv)
 		return -EINVAL;
 
-	err = nla_parse(tb, MWIFIEX_TM_ATTR_MAX, data, len,
-			mwifiex_tm_policy);
+	err = nla_parse(tb, MWIFIEX_TM_ATTR_MAX, data, len, mwifiex_tm_policy,
+			NULL);
 	if (err)
 		return err;
 
diff --git a/drivers/net/wireless/ti/wlcore/testmode.c b/drivers/net/wireless/ti/wlcore/testmode.c
index ddad58f614da..009ec07c4cec 100644
--- a/drivers/net/wireless/ti/wlcore/testmode.c
+++ b/drivers/net/wireless/ti/wlcore/testmode.c
@@ -366,7 +366,8 @@ int wl1271_tm_cmd(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	u32 nla_cmd;
 	int err;
 
-	err = nla_parse(tb, WL1271_TM_ATTR_MAX, data, len, wl1271_tm_policy);
+	err = nla_parse(tb, WL1271_TM_ATTR_MAX, data, len, wl1271_tm_policy,
+			NULL);
 	if (err)
 		return err;
 
diff --git a/drivers/net/wireless/ti/wlcore/vendor_cmd.c b/drivers/net/wireless/ti/wlcore/vendor_cmd.c
index fd4e9ba176c9..5c0bcb1fe1a1 100644
--- a/drivers/net/wireless/ti/wlcore/vendor_cmd.c
+++ b/drivers/net/wireless/ti/wlcore/vendor_cmd.c
@@ -41,7 +41,7 @@ wlcore_vendor_cmd_smart_config_start(struct wiphy *wiphy,
 		return -EINVAL;
 
 	ret = nla_parse(tb, MAX_WLCORE_VENDOR_ATTR, data, data_len,
-			wlcore_vendor_attr_policy);
+			wlcore_vendor_attr_policy, NULL);
 	if (ret)
 		return ret;
 
@@ -116,7 +116,7 @@ wlcore_vendor_cmd_smart_config_set_group_key(struct wiphy *wiphy,
 		return -EINVAL;
 
 	ret = nla_parse(tb, MAX_WLCORE_VENDOR_ATTR, data, data_len,
-			wlcore_vendor_attr_policy);
+			wlcore_vendor_attr_policy, NULL);
 	if (ret)
 		return ret;
 
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index b81a4979e1db..3eeb5fd29883 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -182,14 +182,16 @@ genlmsg_nlhdr(void *user_hdr, const struct genl_family *family)
  * @tb: destination array with maxtype+1 elements
  * @maxtype: maximum attribute type to be expected
  * @policy: validation policy
- * */
+ * @extack: extended ACK report struct
+ */
 static inline int genlmsg_parse(const struct nlmsghdr *nlh,
 				const struct genl_family *family,
 				struct nlattr *tb[], int maxtype,
-				const struct nla_policy *policy)
+				const struct nla_policy *policy,
+				struct netlink_ext_ack *extack)
 {
 	return nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype,
-			   policy);
+			   policy, extack);
 }
 
 /**
diff --git a/include/net/netlink.h b/include/net/netlink.h
index a064ec3e2ee1..01709172b3d3 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -239,9 +239,11 @@ int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
 		 unsigned int group, int report, gfp_t flags);
 
 int nla_validate(const struct nlattr *head, int len, int maxtype,
-		 const struct nla_policy *policy);
+		 const struct nla_policy *policy,
+		 struct netlink_ext_ack *extack);
 int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
-	      int len, const struct nla_policy *policy);
+	      int len, const struct nla_policy *policy,
+	      struct netlink_ext_ack *extack);
 int nla_policy_len(const struct nla_policy *, int);
 struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype);
 size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize);
@@ -375,18 +377,20 @@ nlmsg_next(const struct nlmsghdr *nlh, int *remaining)
  * @tb: destination array with maxtype+1 elements
  * @maxtype: maximum attribute type to be expected
  * @policy: validation policy
+ * @extack: extended ACK report struct
  *
  * See nla_parse()
  */
 static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
 			      struct nlattr *tb[], int maxtype,
-			      const struct nla_policy *policy)
+			      const struct nla_policy *policy,
+			      struct netlink_ext_ack *extack)
 {
 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
 		return -EINVAL;
 
 	return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
-			 nlmsg_attrlen(nlh, hdrlen), policy);
+			 nlmsg_attrlen(nlh, hdrlen), policy, extack);
 }
 
 /**
@@ -410,16 +414,19 @@ static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh,
  * @hdrlen: length of familiy specific header
  * @maxtype: maximum attribute type to be expected
  * @policy: validation policy
+ * @extack: extended ACK report struct
  */
 static inline int nlmsg_validate(const struct nlmsghdr *nlh,
 				 int hdrlen, int maxtype,
-				 const struct nla_policy *policy)
+				 const struct nla_policy *policy,
+				 struct netlink_ext_ack *extack)
 {
 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
 		return -EINVAL;
 
 	return nla_validate(nlmsg_attrdata(nlh, hdrlen),
-			    nlmsg_attrlen(nlh, hdrlen), maxtype, policy);
+			    nlmsg_attrlen(nlh, hdrlen), maxtype, policy,
+			    extack);
 }
 
 /**
@@ -740,14 +747,17 @@ nla_find_nested(const struct nlattr *nla, int attrtype)
  * @maxtype: maximum attribute type to be expected
  * @nla: attribute containing the nested attributes
  * @policy: validation policy
+ * @extack: extended ACK report struct
  *
  * See nla_parse()
  */
 static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
 				   const struct nlattr *nla,
-				   const struct nla_policy *policy)
+				   const struct nla_policy *policy,
+				   struct netlink_ext_ack *extack)
 {
-	return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy);
+	return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
+			 extack);
 }
 
 /**
@@ -1253,6 +1263,7 @@ static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
  * @start: container attribute
  * @maxtype: maximum attribute type to be expected
  * @policy: validation policy
+ * @extack: extended ACK report struct
  *
  * Validates all attributes in the nested attribute stream against the
  * specified policy. Attributes with a type exceeding maxtype will be
@@ -1261,9 +1272,11 @@ static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
  * Returns 0 on success or a negative error code.
  */
 static inline int nla_validate_nested(const struct nlattr *start, int maxtype,
-				      const struct nla_policy *policy)
+				      const struct nla_policy *policy,
+				      struct netlink_ext_ack *extack)
 {
-	return nla_validate(nla_data(start), nla_len(start), maxtype, policy);
+	return nla_validate(nla_data(start), nla_len(start), maxtype, policy,
+			    extack);
 }
 
 /**
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index 106de5f7bf06..c07b941fce89 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -158,7 +158,8 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
 int rtnl_delete_link(struct net_device *dev);
 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
 
-int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len);
+int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
+			struct netlink_ext_ack *exterr);
 
 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
 
diff --git a/lib/nlattr.c b/lib/nlattr.c
index b42b8577fc23..a7e0b16078df 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -112,6 +112,7 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
  * @len: length of attribute stream
  * @maxtype: maximum attribute type to be expected
  * @policy: validation policy
+ * @extack: extended ACK report struct
  *
  * Validates all attributes in the specified attribute stream against the
  * specified policy. Attributes with a type exceeding maxtype will be
@@ -120,20 +121,23 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
  * Returns 0 on success or a negative error code.
  */
 int nla_validate(const struct nlattr *head, int len, int maxtype,
-		 const struct nla_policy *policy)
+		 const struct nla_policy *policy,
+		 struct netlink_ext_ack *extack)
 {
 	const struct nlattr *nla;
-	int rem, err;
+	int rem;
 
 	nla_for_each_attr(nla, head, len, rem) {
-		err = validate_nla(nla, maxtype, policy);
-		if (err < 0)
-			goto errout;
+		int err = validate_nla(nla, maxtype, policy);
+
+		if (err < 0) {
+			if (extack)
+				extack->bad_attr = nla;
+			return err;
+		}
 	}
 
-	err = 0;
-errout:
-	return err;
+	return 0;
 }
 EXPORT_SYMBOL(nla_validate);
 
@@ -180,7 +184,8 @@ EXPORT_SYMBOL(nla_policy_len);
  * Returns 0 on success or a negative error code.
  */
 int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
-	      int len, const struct nla_policy *policy)
+	      int len, const struct nla_policy *policy,
+	      struct netlink_ext_ack *extack)
 {
 	const struct nlattr *nla;
 	int rem, err;
@@ -193,8 +198,11 @@ int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
 		if (type > 0 && type <= maxtype) {
 			if (policy) {
 				err = validate_nla(nla, maxtype, policy);
-				if (err < 0)
+				if (err < 0) {
+					if (extack)
+						extack->bad_attr = nla;
 					goto errout;
+				}
 			}
 
 			tb[type] = (struct nlattr *)nla;
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index 1270207f3d7c..9c94aad153b3 100644
--- a/net/8021q/vlan_netlink.c
+++ b/net/8021q/vlan_netlink.c
@@ -35,7 +35,8 @@ static inline int vlan_validate_qos_map(struct nlattr *attr)
 {
 	if (!attr)
 		return 0;
-	return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
+	return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy,
+				   NULL);
 }
 
 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 056e6ac49d8f..993626a7fc3b 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -464,7 +464,8 @@ static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
 	struct net_device *dev;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
+	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
+			  NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index a8f6acd23e30..e6dea5cd6bd6 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -748,8 +748,8 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 
 	if (p && protinfo) {
 		if (protinfo->nla_type & NLA_F_NESTED) {
-			err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
-					       protinfo, br_port_policy);
+			err = nla_parse_nested(tb, IFLA_BRPORT_MAX, protinfo,
+					       br_port_policy, NULL);
 			if (err)
 				return err;
 
diff --git a/net/bridge/br_netlink_tunnel.c b/net/bridge/br_netlink_tunnel.c
index c913491495ab..3712c7f0e00c 100644
--- a/net/bridge/br_netlink_tunnel.c
+++ b/net/bridge/br_netlink_tunnel.c
@@ -227,8 +227,8 @@ int br_parse_vlan_tunnel_info(struct nlattr *attr,
 
 	memset(tinfo, 0, sizeof(*tinfo));
 
-	err = nla_parse_nested(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
-			       attr, vlan_tunnel_policy);
+	err = nla_parse_nested(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX, attr,
+			       vlan_tunnel_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/can/gw.c b/net/can/gw.c
index 3c117a33e15f..3b84fb7d98aa 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -641,7 +641,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
 	memset(mod, 0, sizeof(*mod));
 
 	err = nlmsg_parse(nlh, sizeof(struct rtcanmsg), tb, CGW_MAX,
-			  cgw_policy);
+			  cgw_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 816e3ccb0ec9..df03110ca3c8 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -386,7 +386,7 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh)
 		goto errout;
 	}
 
-	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
+	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, NULL);
 	if (err < 0)
 		goto errout;
 
@@ -580,7 +580,7 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh)
 		goto errout;
 	}
 
-	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
+	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index 0cfe7b0216c3..b3bc0a31af9f 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -209,7 +209,8 @@ static int bpf_parse_prog(struct nlattr *attr, struct bpf_lwt_prog *prog,
 	int ret;
 	u32 fd;
 
-	ret = nla_parse_nested(tb, LWT_BPF_PROG_MAX, attr, bpf_prog_policy);
+	ret = nla_parse_nested(tb, LWT_BPF_PROG_MAX, attr, bpf_prog_policy,
+			       NULL);
 	if (ret < 0)
 		return ret;
 
@@ -249,7 +250,7 @@ static int bpf_build_state(struct nlattr *nla,
 	if (family != AF_INET && family != AF_INET6)
 		return -EAFNOSUPPORT;
 
-	ret = nla_parse_nested(tb, LWT_BPF_MAX, nla, bpf_nl_policy);
+	ret = nla_parse_nested(tb, LWT_BPF_MAX, nla, bpf_nl_policy, NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 8ae87c591c8e..31f37b264710 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1661,7 +1661,7 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh)
 	int err;
 
 	ASSERT_RTNL();
-	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
+	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, NULL);
 	if (err < 0)
 		goto out;
 
@@ -1946,7 +1946,7 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
 	int err, tidx;
 
 	err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX,
-			  nl_neightbl_policy);
+			  nl_neightbl_policy, NULL);
 	if (err < 0)
 		goto errout;
 
@@ -1984,7 +1984,7 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
 		int i, ifindex = 0;
 
 		err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS],
-				       nl_ntbl_parm_policy);
+				       nl_ntbl_parm_policy, NULL);
 		if (err < 0)
 			goto errout_tbl_lock;
 
@@ -2275,7 +2275,7 @@ static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
 	unsigned int flags = NLM_F_MULTI;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(struct ndmsg), tb, NDA_MAX, NULL);
+	err = nlmsg_parse(nlh, sizeof(struct ndmsg), tb, NDA_MAX, NULL, NULL);
 	if (!err) {
 		if (tb[NDA_IFINDEX])
 			filter_idx = nla_get_u32(tb[NDA_IFINDEX]);
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 652468ff65b7..ec18cbc756d2 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -579,7 +579,7 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
 	int nsid, err;
 
 	err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
-			  rtnl_net_policy);
+			  rtnl_net_policy, NULL);
 	if (err < 0)
 		return err;
 	if (!tb[NETNSA_NSID])
@@ -653,7 +653,7 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh)
 	int err, id;
 
 	err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
-			  rtnl_net_policy);
+			  rtnl_net_policy, NULL);
 	if (err < 0)
 		return err;
 	if (tb[NETNSA_PID])
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 9788147241f4..14bb3c9ef6b7 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1581,7 +1581,8 @@ static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla
 	const struct rtnl_link_ops *ops = NULL;
 	struct nlattr *linfo[IFLA_INFO_MAX + 1];
 
-	if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0)
+	if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
+			     ifla_info_policy, NULL) < 0)
 		return NULL;
 
 	if (linfo[IFLA_INFO_KIND]) {
@@ -1658,8 +1659,8 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 	hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
 
-	if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
-
+	if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX,
+			ifla_policy, NULL) >= 0) {
 		if (tb[IFLA_EXT_MASK])
 			ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
 
@@ -1706,9 +1707,10 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 	return skb->len;
 }
 
-int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
+int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
+			struct netlink_ext_ack *exterr)
 {
-	return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
+	return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
 }
 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
 
@@ -2144,7 +2146,7 @@ static int do_setlink(const struct sk_buff *skb,
 				goto errout;
 			}
 			err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
-					       ifla_vf_policy);
+					       ifla_vf_policy, NULL);
 			if (err < 0)
 				goto errout;
 			err = do_setvfinfo(dev, vfinfo);
@@ -2172,7 +2174,7 @@ static int do_setlink(const struct sk_buff *skb,
 				goto errout;
 			}
 			err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
-					       ifla_port_policy);
+					       ifla_port_policy, NULL);
 			if (err < 0)
 				goto errout;
 			if (!port[IFLA_PORT_VF]) {
@@ -2192,7 +2194,8 @@ static int do_setlink(const struct sk_buff *skb,
 		struct nlattr *port[IFLA_PORT_MAX+1];
 
 		err = nla_parse_nested(port, IFLA_PORT_MAX,
-			tb[IFLA_PORT_SELF], ifla_port_policy);
+				       tb[IFLA_PORT_SELF], ifla_port_policy,
+				       NULL);
 		if (err < 0)
 			goto errout;
 
@@ -2236,7 +2239,7 @@ static int do_setlink(const struct sk_buff *skb,
 		u32 xdp_flags = 0;
 
 		err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
-				       ifla_xdp_policy);
+				       ifla_xdp_policy, NULL);
 		if (err < 0)
 			goto errout;
 
@@ -2285,7 +2288,7 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
 	struct nlattr *tb[IFLA_MAX+1];
 	char ifname[IFNAMSIZ];
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, NULL);
 	if (err < 0)
 		goto errout;
 
@@ -2378,7 +2381,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
 	struct nlattr *tb[IFLA_MAX+1];
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -2507,7 +2510,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
 #ifdef CONFIG_MODULES
 replay:
 #endif
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -2538,7 +2541,8 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
 
 	if (tb[IFLA_LINKINFO]) {
 		err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
-				       tb[IFLA_LINKINFO], ifla_info_policy);
+				       tb[IFLA_LINKINFO], ifla_info_policy,
+				       NULL);
 		if (err < 0)
 			return err;
 	} else
@@ -2563,7 +2567,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
 			if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
 				err = nla_parse_nested(attr, ops->maxtype,
 						       linkinfo[IFLA_INFO_DATA],
-						       ops->policy);
+						       ops->policy, NULL);
 				if (err < 0)
 					return err;
 				data = attr;
@@ -2581,7 +2585,8 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
 				err = nla_parse_nested(slave_attr,
 						       m_ops->slave_maxtype,
 						       linkinfo[IFLA_INFO_SLAVE_DATA],
-						       m_ops->slave_policy);
+						       m_ops->slave_policy,
+						       NULL);
 				if (err < 0)
 					return err;
 				slave_data = slave_attr;
@@ -2750,7 +2755,7 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
 	int err;
 	u32 ext_filter_mask = 0;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -2800,7 +2805,7 @@ static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
 	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
 
-	if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
+	if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
 		if (tb[IFLA_EXT_MASK])
 			ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
 	}
@@ -3039,7 +3044,7 @@ static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
 	u16 vid;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
+	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, NULL);
 	if (err < 0)
 		return err;
 
@@ -3142,7 +3147,7 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
 	if (!netlink_capable(skb, CAP_NET_ADMIN))
 		return -EPERM;
 
-	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
+	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, NULL);
 	if (err < 0)
 		return err;
 
@@ -3277,8 +3282,8 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	int err = 0;
 	int fidx = 0;
 
-	if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
-			ifla_policy) == 0) {
+	if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb,
+			IFLA_MAX, ifla_policy, NULL) == 0) {
 		if (tb[IFLA_MASTER])
 			br_idx = nla_get_u32(tb[IFLA_MASTER]);
 	}
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 3202d75329b5..3f5a5f710576 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -245,8 +245,7 @@ static int dcbnl_getpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 
 	ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
-	                       tb[DCB_ATTR_PFC_CFG],
-	                       dcbnl_pfc_up_nest);
+			       tb[DCB_ATTR_PFC_CFG], dcbnl_pfc_up_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -304,7 +303,7 @@ static int dcbnl_getcap(struct net_device *netdev, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 
 	ret = nla_parse_nested(data, DCB_CAP_ATTR_MAX, tb[DCB_ATTR_CAP],
-	                       dcbnl_cap_nest);
+			       dcbnl_cap_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -348,7 +347,7 @@ static int dcbnl_getnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 
 	ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
-	                       dcbnl_numtcs_nest);
+			       dcbnl_numtcs_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -393,7 +392,7 @@ static int dcbnl_setnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 
 	ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
-	                       dcbnl_numtcs_nest);
+			       dcbnl_numtcs_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -452,7 +451,7 @@ static int dcbnl_getapp(struct net_device *netdev, struct nlmsghdr *nlh,
 		return -EINVAL;
 
 	ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
-	                       dcbnl_app_nest);
+			       dcbnl_app_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -520,7 +519,7 @@ static int dcbnl_setapp(struct net_device *netdev, struct nlmsghdr *nlh,
 		return -EINVAL;
 
 	ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
-	                       dcbnl_app_nest);
+			       dcbnl_app_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -577,8 +576,8 @@ static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 	    !netdev->dcbnl_ops->getpgbwgcfgrx)
 		return -EOPNOTSUPP;
 
-	ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
-	                       tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
+	ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX, tb[DCB_ATTR_PG_CFG],
+			       dcbnl_pg_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -597,8 +596,8 @@ static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 			data = pg_tb[DCB_PG_ATTR_TC_ALL];
 		else
 			data = pg_tb[i];
-		ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
-				       data, dcbnl_tc_param_nest);
+		ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX, data,
+				       dcbnl_tc_param_nest, NULL);
 		if (ret)
 			goto err_pg;
 
@@ -735,8 +734,7 @@ static int dcbnl_setpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 
 	ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
-	                       tb[DCB_ATTR_PFC_CFG],
-	                       dcbnl_pfc_up_nest);
+			       tb[DCB_ATTR_PFC_CFG], dcbnl_pfc_up_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -791,8 +789,8 @@ static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 	    !netdev->dcbnl_ops->setpgbwgcfgrx)
 		return -EOPNOTSUPP;
 
-	ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
-	                       tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
+	ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX, tb[DCB_ATTR_PG_CFG],
+			       dcbnl_pg_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -801,7 +799,7 @@ static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 			continue;
 
 		ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
-		                       pg_tb[i], dcbnl_tc_param_nest);
+				       pg_tb[i], dcbnl_tc_param_nest, NULL);
 		if (ret)
 			return ret;
 
@@ -889,8 +887,8 @@ static int dcbnl_bcn_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 	    !netdev->dcbnl_ops->getbcncfg)
 		return -EOPNOTSUPP;
 
-	ret = nla_parse_nested(bcn_tb, DCB_BCN_ATTR_MAX,
-	                       tb[DCB_ATTR_BCN], dcbnl_bcn_nest);
+	ret = nla_parse_nested(bcn_tb, DCB_BCN_ATTR_MAX, tb[DCB_ATTR_BCN],
+			       dcbnl_bcn_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -948,9 +946,8 @@ static int dcbnl_bcn_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 	    !netdev->dcbnl_ops->setbcnrp)
 		return -EOPNOTSUPP;
 
-	ret = nla_parse_nested(data, DCB_BCN_ATTR_MAX,
-	                       tb[DCB_ATTR_BCN],
-	                       dcbnl_pfc_up_nest);
+	ret = nla_parse_nested(data, DCB_BCN_ATTR_MAX, tb[DCB_ATTR_BCN],
+			       dcbnl_pfc_up_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -1424,8 +1421,8 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
 	if (!tb[DCB_ATTR_IEEE])
 		return -EINVAL;
 
-	err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX,
-			       tb[DCB_ATTR_IEEE], dcbnl_ieee_policy);
+	err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX, tb[DCB_ATTR_IEEE],
+			       dcbnl_ieee_policy, NULL);
 	if (err)
 		return err;
 
@@ -1508,8 +1505,8 @@ static int dcbnl_ieee_del(struct net_device *netdev, struct nlmsghdr *nlh,
 	if (!tb[DCB_ATTR_IEEE])
 		return -EINVAL;
 
-	err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX,
-			       tb[DCB_ATTR_IEEE], dcbnl_ieee_policy);
+	err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX, tb[DCB_ATTR_IEEE],
+			       dcbnl_ieee_policy, NULL);
 	if (err)
 		return err;
 
@@ -1581,8 +1578,8 @@ static int dcbnl_getfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 	if (!tb[DCB_ATTR_FEATCFG])
 		return -EINVAL;
 
-	ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX, tb[DCB_ATTR_FEATCFG],
-			       dcbnl_featcfg_nest);
+	ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX,
+			       tb[DCB_ATTR_FEATCFG], dcbnl_featcfg_nest, NULL);
 	if (ret)
 		return ret;
 
@@ -1625,8 +1622,8 @@ static int dcbnl_setfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 	if (!tb[DCB_ATTR_FEATCFG])
 		return -EINVAL;
 
-	ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX, tb[DCB_ATTR_FEATCFG],
-			       dcbnl_featcfg_nest);
+	ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX,
+			       tb[DCB_ATTR_FEATCFG], dcbnl_featcfg_nest, NULL);
 
 	if (ret)
 		goto err;
@@ -1715,7 +1712,7 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
 		return -EPERM;
 
 	ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
-			  dcbnl_rtnl_policy);
+			  dcbnl_rtnl_policy, NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 8fdd9f492b0e..e65f1be44e8e 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -581,7 +581,7 @@ static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
 	if (!net_eq(net, &init_net))
 		goto errout;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy, NULL);
 	if (err < 0)
 		goto errout;
 
@@ -625,7 +625,7 @@ static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
 	if (!net_eq(net, &init_net))
 		return -EINVAL;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
index 7af0ba6157a1..34663bf8aa6d 100644
--- a/net/decnet/dn_fib.c
+++ b/net/decnet/dn_fib.c
@@ -515,7 +515,8 @@ static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
 	if (!net_eq(net, &init_net))
 		return -EINVAL;
 
-	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
+	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy,
+			  NULL);
 	if (err < 0)
 		return err;
 
@@ -540,7 +541,8 @@ static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
 	if (!net_eq(net, &init_net))
 		return -EINVAL;
 
-	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
+	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy,
+			  NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index b1dc096d22f8..2d7097bbc666 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1654,7 +1654,7 @@ static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 	if (!net_eq(net, &init_net))
 		return -EINVAL;
 
-	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_dn_policy);
+	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_dn_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index fc60cd061f39..d6b1a1b21909 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -249,8 +249,7 @@ nl802154_prepare_wpan_dev_dump(struct sk_buff *skb,
 	if (!cb->args[0]) {
 		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize,
 				  genl_family_attrbuf(&nl802154_fam),
-				  nl802154_fam.maxattr,
-				  nl802154_policy);
+				  nl802154_fam.maxattr, nl802154_policy, NULL);
 		if (err)
 			goto out_unlock;
 
@@ -562,8 +561,8 @@ static int nl802154_dump_wpan_phy_parse(struct sk_buff *skb,
 					struct nl802154_dump_wpan_phy_state *state)
 {
 	struct nlattr **tb = genl_family_attrbuf(&nl802154_fam);
-	int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize,
-			      tb, nl802154_fam.maxattr, nl802154_policy);
+	int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize, tb,
+			      nl802154_fam.maxattr, nl802154_policy, NULL);
 
 	/* TODO check if we can handle error here,
 	 * we have no backward compatibility
@@ -1308,7 +1307,7 @@ ieee802154_llsec_parse_dev_addr(struct nlattr *nla,
 	struct nlattr *attrs[NL802154_DEV_ADDR_ATTR_MAX + 1];
 
 	if (!nla || nla_parse_nested(attrs, NL802154_DEV_ADDR_ATTR_MAX, nla,
-				     nl802154_dev_addr_policy))
+				     nl802154_dev_addr_policy, NULL))
 		return -EINVAL;
 
 	if (!attrs[NL802154_DEV_ADDR_ATTR_PAN_ID] ||
@@ -1348,7 +1347,7 @@ ieee802154_llsec_parse_key_id(struct nlattr *nla,
 	struct nlattr *attrs[NL802154_KEY_ID_ATTR_MAX + 1];
 
 	if (!nla || nla_parse_nested(attrs, NL802154_KEY_ID_ATTR_MAX, nla,
-				     nl802154_key_id_policy))
+				     nl802154_key_id_policy, NULL))
 		return -EINVAL;
 
 	if (!attrs[NL802154_KEY_ID_ATTR_MODE])
@@ -1565,7 +1564,7 @@ static int nl802154_add_llsec_key(struct sk_buff *skb, struct genl_info *info)
 
 	if (nla_parse_nested(attrs, NL802154_KEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_KEY],
-			     nl802154_key_policy))
+			     nl802154_key_policy, NULL))
 		return -EINVAL;
 
 	if (!attrs[NL802154_KEY_ATTR_USAGE_FRAMES] ||
@@ -1615,7 +1614,7 @@ static int nl802154_del_llsec_key(struct sk_buff *skb, struct genl_info *info)
 
 	if (nla_parse_nested(attrs, NL802154_KEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_KEY],
-			     nl802154_key_policy))
+			     nl802154_key_policy, NULL))
 		return -EINVAL;
 
 	if (ieee802154_llsec_parse_key_id(attrs[NL802154_KEY_ATTR_ID], &id) < 0)
@@ -1729,8 +1728,8 @@ ieee802154_llsec_parse_device(struct nlattr *nla,
 {
 	struct nlattr *attrs[NL802154_DEV_ATTR_MAX + 1];
 
-	if (!nla || nla_parse_nested(attrs, NL802154_DEV_ATTR_MAX, nla,
-				     nl802154_dev_policy))
+	if (!nla || nla_parse_nested(attrs, NL802154_DEV_ATTR_MAX,
+				     nla, nl802154_dev_policy, NULL))
 		return -EINVAL;
 
 	memset(dev, 0, sizeof(*dev));
@@ -1783,7 +1782,7 @@ static int nl802154_del_llsec_dev(struct sk_buff *skb, struct genl_info *info)
 
 	if (nla_parse_nested(attrs, NL802154_DEV_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_DEVICE],
-			     nl802154_dev_policy))
+			     nl802154_dev_policy, NULL))
 		return -EINVAL;
 
 	if (!attrs[NL802154_DEV_ATTR_EXTENDED_ADDR])
@@ -1911,7 +1910,7 @@ static int nl802154_add_llsec_devkey(struct sk_buff *skb, struct genl_info *info
 	if (!info->attrs[NL802154_ATTR_SEC_DEVKEY] ||
 	    nla_parse_nested(attrs, NL802154_DEVKEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_DEVKEY],
-			     nl802154_devkey_policy) < 0)
+			     nl802154_devkey_policy, NULL) < 0)
 		return -EINVAL;
 
 	if (!attrs[NL802154_DEVKEY_ATTR_FRAME_COUNTER] ||
@@ -1943,7 +1942,7 @@ static int nl802154_del_llsec_devkey(struct sk_buff *skb, struct genl_info *info
 
 	if (nla_parse_nested(attrs, NL802154_DEVKEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_DEVKEY],
-			     nl802154_devkey_policy))
+			     nl802154_devkey_policy, NULL))
 		return -EINVAL;
 
 	if (!attrs[NL802154_DEVKEY_ATTR_EXTENDED_ADDR])
@@ -2063,8 +2062,8 @@ llsec_parse_seclevel(struct nlattr *nla, struct ieee802154_llsec_seclevel *sl)
 {
 	struct nlattr *attrs[NL802154_SECLEVEL_ATTR_MAX + 1];
 
-	if (!nla || nla_parse_nested(attrs, NL802154_SECLEVEL_ATTR_MAX, nla,
-				     nl802154_seclevel_policy))
+	if (!nla || nla_parse_nested(attrs, NL802154_SECLEVEL_ATTR_MAX,
+				     nla, nl802154_seclevel_policy, NULL))
 		return -EINVAL;
 
 	memset(sl, 0, sizeof(*sl));
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 6d3602ec640c..f33f53791f50 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -582,7 +582,8 @@ static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
 
 	ASSERT_RTNL();
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
+			  NULL);
 	if (err < 0)
 		goto errout;
 
@@ -752,7 +753,8 @@ static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
 	struct in_device *in_dev;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
+			  NULL);
 	if (err < 0)
 		goto errout;
 
@@ -1717,7 +1719,7 @@ static int inet_validate_link_af(const struct net_device *dev,
 	if (dev && !__in_dev_get_rtnl(dev))
 		return -EAFNOSUPPORT;
 
-	err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
+	err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -1745,7 +1747,7 @@ static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
 	if (!in_dev)
 		return -EAFNOSUPPORT;
 
-	if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
+	if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
 		BUG();
 
 	if (tb[IFLA_INET_CONF]) {
@@ -1882,7 +1884,7 @@ static int inet_netconf_get_devconf(struct sk_buff *in_skb,
 	int err;
 
 	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
-			  devconf_ipv4_policy);
+			  devconf_ipv4_policy, NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 8f2133ffc2ff..434dd2538716 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -632,7 +632,8 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
 	int err, remaining;
 	struct rtmsg *rtm;
 
-	err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
+	err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
+			     NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index a31f47ccaad9..baf196eaf1d8 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -235,7 +235,7 @@ static int ip_tun_build_state(struct nlattr *attr,
 	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
 	int err;
 
-	err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy);
+	err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -332,7 +332,8 @@ static int ip6_tun_build_state(struct nlattr *attr,
 	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
 	int err;
 
-	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy);
+	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 5bca64fc71b7..d7be21f2174a 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2439,7 +2439,8 @@ static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
 	struct rtmsg *rtm;
 	int ret, rem;
 
-	ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy);
+	ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy,
+			     NULL);
 	if (ret < 0)
 		goto out;
 	rtm = nlmsg_data(nlh);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 5e1e60546fce..a8351ea18db3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2649,7 +2649,8 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 	u32 table_id = RT_TABLE_MAIN;
 	kuid_t uid;
 
-	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy);
+	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy,
+			  NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 67ec87ea5fb6..b330c2abcb24 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -624,7 +624,7 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 	int err;
 
 	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
-			  devconf_ipv6_policy);
+			  devconf_ipv6_policy, NULL);
 	if (err < 0)
 		goto errout;
 
@@ -4408,7 +4408,8 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
 	u32 ifa_flags;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
+			  NULL);
 	if (err < 0)
 		return err;
 
@@ -4520,7 +4521,8 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
 	u32 ifa_flags;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
+			  NULL);
 	if (err < 0)
 		return err;
 
@@ -4881,7 +4883,8 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 	struct sk_buff *skb;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
+			  NULL);
 	if (err < 0)
 		goto errout;
 
@@ -5251,7 +5254,8 @@ static int inet6_validate_link_af(const struct net_device *dev,
 	if (dev && !__in6_dev_get(dev))
 		return -EAFNOSUPPORT;
 
-	return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
+	return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
+				NULL);
 }
 
 static int check_addr_gen_mode(int mode)
@@ -5283,7 +5287,7 @@ static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
 	if (!idev)
 		return -EAFNOSUPPORT;
 
-	if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
+	if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
 		BUG();
 
 	if (tb[IFLA_INET6_TOKEN]) {
diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
index a8f6986dcbe5..6cb4ed91722a 100644
--- a/net/ipv6/addrlabel.c
+++ b/net/ipv6/addrlabel.c
@@ -413,7 +413,7 @@ static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh)
 	u32 label;
 	int err = 0;
 
-	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -532,7 +532,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 	struct ip6addrlbl_entry *p;
 	struct sk_buff *skb;
 
-	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
index ce1aae4a7fc8..b3df03e3faa0 100644
--- a/net/ipv6/ila/ila_lwt.c
+++ b/net/ipv6/ila/ila_lwt.c
@@ -146,8 +146,7 @@ static int ila_build_state(struct nlattr *nla,
 		return -EINVAL;
 	}
 
-	ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla,
-			       ila_nl_policy);
+	ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 9db1418993f2..ccde23eba702 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2906,7 +2906,8 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
 	unsigned int pref;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
+	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
+			  NULL);
 	if (err < 0)
 		goto errout;
 
@@ -3574,7 +3575,8 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 	struct flowi6 fl6;
 	int err, iif = 0, oif = 0;
 
-	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
+	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
+			  NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index a644aaecdfd3..7436a4a62f3e 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -328,7 +328,7 @@ static int seg6_build_state(struct nlattr *nla,
 	int err;
 
 	err = nla_parse_nested(tb, SEG6_IPTUNNEL_MAX, nla,
-			       seg6_iptunnel_policy);
+			       seg6_iptunnel_policy, NULL);
 
 	if (err < 0)
 		return err;
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 5928d22ba9c8..07181d2273e1 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1122,7 +1122,7 @@ static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
 	int err;
 
 	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
-			  devconf_mpls_policy);
+			  devconf_mpls_policy, NULL);
 	if (err < 0)
 		goto errout;
 
@@ -1643,7 +1643,8 @@ static int rtm_to_route_config(struct sk_buff *skb,  struct nlmsghdr *nlh,
 	int index;
 	int err;
 
-	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy);
+	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy,
+			  NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c
index fe00e98667cf..369c7a23c86c 100644
--- a/net/mpls/mpls_iptunnel.c
+++ b/net/mpls/mpls_iptunnel.c
@@ -168,7 +168,7 @@ static int mpls_build_state(struct nlattr *nla,
 	int ret;
 
 	ret = nla_parse_nested(tb, MPLS_IPTUNNEL_MAX, nla,
-			       mpls_iptunnel_policy);
+			       mpls_iptunnel_policy, NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 26356bf8cebf..9bd5b6636181 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -295,7 +295,8 @@ ip_set_get_ipaddr4(struct nlattr *nla,  __be32 *ipaddr)
 
 	if (unlikely(!flag_nested(nla)))
 		return -IPSET_ERR_PROTOCOL;
-	if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy))
+	if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla,
+			     ipaddr_policy, NULL))
 		return -IPSET_ERR_PROTOCOL;
 	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4)))
 		return -IPSET_ERR_PROTOCOL;
@@ -313,7 +314,8 @@ ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr)
 	if (unlikely(!flag_nested(nla)))
 		return -IPSET_ERR_PROTOCOL;
 
-	if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy))
+	if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla,
+			     ipaddr_policy, NULL))
 		return -IPSET_ERR_PROTOCOL;
 	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6)))
 		return -IPSET_ERR_PROTOCOL;
@@ -906,7 +908,7 @@ static int ip_set_create(struct net *net, struct sock *ctnl,
 	/* Without holding any locks, create private part. */
 	if (attr[IPSET_ATTR_DATA] &&
 	    nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA],
-			     set->type->create_policy)) {
+			     set->type->create_policy, NULL)) {
 		ret = -IPSET_ERR_PROTOCOL;
 		goto put_out;
 	}
@@ -1257,8 +1259,8 @@ dump_init(struct netlink_callback *cb, struct ip_set_net *inst)
 	ip_set_id_t index;
 
 	/* Second pass, so parser can't fail */
-	nla_parse(cda, IPSET_ATTR_CMD_MAX,
-		  attr, nlh->nlmsg_len - min_len, ip_set_setname_policy);
+	nla_parse(cda, IPSET_ATTR_CMD_MAX, attr, nlh->nlmsg_len - min_len,
+		  ip_set_setname_policy, NULL);
 
 	if (cda[IPSET_ATTR_SETNAME]) {
 		struct ip_set *set;
@@ -1501,9 +1503,8 @@ call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set,
 		memcpy(&errmsg->msg, nlh, nlh->nlmsg_len);
 		cmdattr = (void *)&errmsg->msg + min_len;
 
-		nla_parse(cda, IPSET_ATTR_CMD_MAX,
-			  cmdattr, nlh->nlmsg_len - min_len,
-			  ip_set_adt_policy);
+		nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr,
+			  nlh->nlmsg_len - min_len, ip_set_adt_policy, NULL);
 
 		errline = nla_data(cda[IPSET_ATTR_LINENO]);
 
@@ -1549,7 +1550,7 @@ static int ip_set_uadd(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 	if (attr[IPSET_ATTR_DATA]) {
 		if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX,
 				     attr[IPSET_ATTR_DATA],
-				     set->type->adt_policy))
+				     set->type->adt_policy, NULL))
 			return -IPSET_ERR_PROTOCOL;
 		ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags,
 			      use_lineno);
@@ -1561,7 +1562,7 @@ static int ip_set_uadd(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 			if (nla_type(nla) != IPSET_ATTR_DATA ||
 			    !flag_nested(nla) ||
 			    nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla,
-					     set->type->adt_policy))
+					     set->type->adt_policy, NULL))
 				return -IPSET_ERR_PROTOCOL;
 			ret = call_ad(ctnl, skb, set, tb, IPSET_ADD,
 				      flags, use_lineno);
@@ -1603,7 +1604,7 @@ static int ip_set_udel(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 	if (attr[IPSET_ATTR_DATA]) {
 		if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX,
 				     attr[IPSET_ATTR_DATA],
-				     set->type->adt_policy))
+				     set->type->adt_policy, NULL))
 			return -IPSET_ERR_PROTOCOL;
 		ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags,
 			      use_lineno);
@@ -1615,7 +1616,7 @@ static int ip_set_udel(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 			if (nla_type(nla) != IPSET_ATTR_DATA ||
 			    !flag_nested(nla) ||
 			    nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla,
-					     set->type->adt_policy))
+					     set->type->adt_policy, NULL))
 				return -IPSET_ERR_PROTOCOL;
 			ret = call_ad(ctnl, skb, set, tb, IPSET_DEL,
 				      flags, use_lineno);
@@ -1646,7 +1647,7 @@ static int ip_set_utest(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 		return -ENOENT;
 
 	if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA],
-			     set->type->adt_policy))
+			     set->type->adt_policy, NULL))
 		return -IPSET_ERR_PROTOCOL;
 
 	rcu_read_lock_bh();
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 541aa7694775..adb7ee142c5f 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -3089,7 +3089,8 @@ static int ip_vs_genl_parse_service(struct netns_ipvs *ipvs,
 
 	/* Parse mandatory identifying service fields first */
 	if (nla == NULL ||
-	    nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
+	    nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla,
+			     ip_vs_svc_policy, NULL))
 		return -EINVAL;
 
 	nla_af		= attrs[IPVS_SVC_ATTR_AF];
@@ -3251,8 +3252,8 @@ static int ip_vs_genl_dump_dests(struct sk_buff *skb,
 	mutex_lock(&__ip_vs_mutex);
 
 	/* Try to find the service for which to dump destinations */
-	if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
-			IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
+	if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs, IPVS_CMD_ATTR_MAX,
+			ip_vs_cmd_policy, NULL))
 		goto out_err;
 
 
@@ -3288,7 +3289,8 @@ static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
 
 	/* Parse mandatory identifying destination fields first */
 	if (nla == NULL ||
-	    nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
+	    nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla,
+			     ip_vs_dest_policy, NULL))
 		return -EINVAL;
 
 	nla_addr	= attrs[IPVS_DEST_ATTR_ADDR];
@@ -3530,7 +3532,7 @@ static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
 		if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
 		    nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
 				     info->attrs[IPVS_CMD_ATTR_DAEMON],
-				     ip_vs_daemon_policy))
+				     ip_vs_daemon_policy, NULL))
 			goto out;
 
 		if (cmd == IPVS_CMD_NEW_DAEMON)
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index ecdc324c7785..ace824ab2e03 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -908,7 +908,7 @@ static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
 	struct nf_conntrack_l3proto *l3proto;
 	int ret = 0;
 
-	ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
+	ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL, NULL);
 	if (ret < 0)
 		return ret;
 
@@ -917,7 +917,7 @@ static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
 
 	if (likely(l3proto->nlattr_to_tuple)) {
 		ret = nla_validate_nested(attr, CTA_IP_MAX,
-					  l3proto->nla_policy);
+					  l3proto->nla_policy, NULL);
 		if (ret == 0)
 			ret = l3proto->nlattr_to_tuple(tb, tuple);
 	}
@@ -938,7 +938,8 @@ static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
 	struct nf_conntrack_l4proto *l4proto;
 	int ret = 0;
 
-	ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
+	ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy,
+			       NULL);
 	if (ret < 0)
 		return ret;
 
@@ -951,7 +952,7 @@ static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
 
 	if (likely(l4proto->nlattr_to_tuple)) {
 		ret = nla_validate_nested(attr, CTA_PROTO_MAX,
-					  l4proto->nla_policy);
+					  l4proto->nla_policy, NULL);
 		if (ret == 0)
 			ret = l4proto->nlattr_to_tuple(tb, tuple);
 	}
@@ -1015,7 +1016,8 @@ ctnetlink_parse_tuple(const struct nlattr * const cda[],
 
 	memset(tuple, 0, sizeof(*tuple));
 
-	err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
+	err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
@@ -1065,7 +1067,7 @@ static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
 	int err;
 	struct nlattr *tb[CTA_HELP_MAX+1];
 
-	err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
+	err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -1566,7 +1568,8 @@ static int ctnetlink_change_protoinfo(struct nf_conn *ct,
 	struct nf_conntrack_l4proto *l4proto;
 	int err = 0;
 
-	err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
+	err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
@@ -1591,7 +1594,7 @@ static int change_seq_adj(struct nf_ct_seqadj *seq,
 	int err;
 	struct nlattr *cda[CTA_SEQADJ_MAX+1];
 
-	err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
+	err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -2348,7 +2351,7 @@ ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
 	struct nlattr *cda[CTA_MAX+1];
 	int ret;
 
-	ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
+	ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy, NULL);
 	if (ret < 0)
 		return ret;
 
@@ -2385,7 +2388,8 @@ ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
 	struct nf_conntrack_expect *exp;
 	int err;
 
-	err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
+	err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
@@ -3004,7 +3008,8 @@ ctnetlink_parse_expect_nat(const struct nlattr *attr,
 	struct nf_conntrack_tuple nat_tuple = {};
 	int err;
 
-	err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
+	err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr,
+			       exp_nat_nla_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index 93dd1c5b7bff..b2e02dfe7fa8 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -665,7 +665,7 @@ static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct)
 		return 0;
 
 	err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr,
-			       dccp_nla_policy);
+			       dccp_nla_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 33279aab583d..2a7300587c87 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -584,10 +584,8 @@ static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
 	if (!attr)
 		return 0;
 
-	err = nla_parse_nested(tb,
-			       CTA_PROTOINFO_SCTP_MAX,
-			       attr,
-			       sctp_nla_policy);
+	err = nla_parse_nested(tb, CTA_PROTOINFO_SCTP_MAX, attr,
+			       sctp_nla_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index b122e9dacfed..85bde77ad967 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -1234,7 +1234,8 @@ static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct)
 	if (!pattr)
 		return 0;
 
-	err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy);
+	err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr,
+			       tcp_nla_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 82802e4a6640..908ba5abbc0b 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -751,7 +751,8 @@ static int nfnetlink_parse_nat_proto(struct nlattr *attr,
 	const struct nf_nat_l4proto *l4proto;
 	int err;
 
-	err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
+	err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr,
+			       protonat_nla_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -780,7 +781,7 @@ nfnetlink_parse_nat(const struct nlattr *nat,
 
 	memset(range, 0, sizeof(*range));
 
-	err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
+	err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 2d822d2fd830..907431318637 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1182,7 +1182,8 @@ static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
 	struct nft_stats *stats;
 	int err;
 
-	err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
+	err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
+			       NULL);
 	if (err < 0)
 		return ERR_PTR(err);
 
@@ -1257,7 +1258,7 @@ static int nft_chain_parse_hook(struct net *net,
 	int err;
 
 	err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
-			       nft_hook_policy);
+			       nft_hook_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -1724,7 +1725,7 @@ static int nf_tables_expr_parse(const struct nft_ctx *ctx,
 	struct nlattr *tb[NFTA_EXPR_MAX + 1];
 	int err;
 
-	err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
+	err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -1734,7 +1735,7 @@ static int nf_tables_expr_parse(const struct nft_ctx *ctx,
 
 	if (tb[NFTA_EXPR_DATA]) {
 		err = nla_parse_nested(info->tb, type->maxattr,
-				       tb[NFTA_EXPR_DATA], type->policy);
+				       tb[NFTA_EXPR_DATA], type->policy, NULL);
 		if (err < 0)
 			goto err1;
 	} else
@@ -2879,7 +2880,8 @@ static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
 	struct nlattr *da[NFTA_SET_DESC_MAX + 1];
 	int err;
 
-	err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
+	err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
+			       nft_set_desc_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -3381,7 +3383,8 @@ static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
 	int event, err;
 
 	err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
-			  NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
+			  NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy,
+			  NULL);
 	if (err < 0)
 		return err;
 
@@ -3640,7 +3643,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 	int err;
 
 	err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
-			       nft_set_elem_policy);
+			       nft_set_elem_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -3870,7 +3873,7 @@ static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
 	int err;
 
 	err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
-			       nft_set_elem_policy);
+			       nft_set_elem_policy, NULL);
 	if (err < 0)
 		goto err1;
 
@@ -4101,7 +4104,8 @@ static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
 	int err;
 
 	if (attr) {
-		err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
+		err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
+				       NULL);
 		if (err < 0)
 			goto err1;
 	} else {
@@ -5314,7 +5318,8 @@ static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
 	struct nft_chain *chain;
 	int err;
 
-	err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
+	err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
@@ -5444,7 +5449,7 @@ int nft_data_init(const struct nft_ctx *ctx,
 	struct nlattr *tb[NFTA_DATA_MAX + 1];
 	int err;
 
-	err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
+	err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 181d3bb800e6..792def00a07d 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -192,8 +192,8 @@ static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 		int attrlen = nlh->nlmsg_len - min_len;
 		__u8 subsys_id = NFNL_SUBSYS_ID(type);
 
-		err = nla_parse(cda, ss->cb[cb_id].attr_count,
-				attr, attrlen, ss->cb[cb_id].policy);
+		err = nla_parse(cda, ss->cb[cb_id].attr_count, attr, attrlen,
+				ss->cb[cb_id].policy, NULL);
 		if (err < 0) {
 			rcu_read_unlock();
 			return err;
@@ -377,8 +377,8 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 			struct nlattr *attr = (void *)nlh + min_len;
 			int attrlen = nlh->nlmsg_len - min_len;
 
-			err = nla_parse(cda, ss->cb[cb_id].attr_count,
-					attr, attrlen, ss->cb[cb_id].policy);
+			err = nla_parse(cda, ss->cb[cb_id].attr_count, attr,
+					attrlen, ss->cb[cb_id].policy, NULL);
 			if (err < 0)
 				goto ack;
 
@@ -467,7 +467,8 @@ static void nfnetlink_rcv_skb_batch(struct sk_buff *skb, struct nlmsghdr *nlh)
 	    skb->len < NLMSG_HDRLEN + sizeof(struct nfgenmsg))
 		return;
 
-	err = nla_parse(cda, NFNL_BATCH_MAX, attr, attrlen, nfnl_batch_policy);
+	err = nla_parse(cda, NFNL_BATCH_MAX, attr, attrlen, nfnl_batch_policy,
+			NULL);
 	if (err < 0) {
 		netlink_ack(skb, nlh, err, NULL);
 		return;
diff --git a/net/netfilter/nfnetlink_acct.c b/net/netfilter/nfnetlink_acct.c
index c86da174a5fc..2837d5fb98bd 100644
--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -244,7 +244,8 @@ nfacct_filter_alloc(const struct nlattr * const attr)
 	struct nlattr *tb[NFACCT_FILTER_MAX + 1];
 	int err;
 
-	err = nla_parse_nested(tb, NFACCT_FILTER_MAX, attr, filter_policy);
+	err = nla_parse_nested(tb, NFACCT_FILTER_MAX, attr, filter_policy,
+			       NULL);
 	if (err < 0)
 		return ERR_PTR(err);
 
diff --git a/net/netfilter/nfnetlink_cthelper.c b/net/netfilter/nfnetlink_cthelper.c
index d45558178da5..5b6c68311566 100644
--- a/net/netfilter/nfnetlink_cthelper.c
+++ b/net/netfilter/nfnetlink_cthelper.c
@@ -77,7 +77,8 @@ nfnl_cthelper_parse_tuple(struct nf_conntrack_tuple *tuple,
 	int err;
 	struct nlattr *tb[NFCTH_TUPLE_MAX+1];
 
-	err = nla_parse_nested(tb, NFCTH_TUPLE_MAX, attr, nfnl_cthelper_tuple_pol);
+	err = nla_parse_nested(tb, NFCTH_TUPLE_MAX, attr,
+			       nfnl_cthelper_tuple_pol, NULL);
 	if (err < 0)
 		return err;
 
@@ -137,7 +138,8 @@ nfnl_cthelper_expect_policy(struct nf_conntrack_expect_policy *expect_policy,
 	int err;
 	struct nlattr *tb[NFCTH_POLICY_MAX+1];
 
-	err = nla_parse_nested(tb, NFCTH_POLICY_MAX, attr, nfnl_cthelper_expect_pol);
+	err = nla_parse_nested(tb, NFCTH_POLICY_MAX, attr,
+			       nfnl_cthelper_expect_pol, NULL);
 	if (err < 0)
 		return err;
 
@@ -171,7 +173,7 @@ nfnl_cthelper_parse_expect_policy(struct nf_conntrack_helper *helper,
 	unsigned int class_max;
 
 	ret = nla_parse_nested(tb, NFCTH_POLICY_SET_MAX, attr,
-			       nfnl_cthelper_expect_policy_set);
+			       nfnl_cthelper_expect_policy_set, NULL);
 	if (ret < 0)
 		return ret;
 
@@ -276,7 +278,7 @@ nfnl_cthelper_update_policy_one(const struct nf_conntrack_expect_policy *policy,
 	int err;
 
 	err = nla_parse_nested(tb, NFCTH_POLICY_MAX, attr,
-			       nfnl_cthelper_expect_pol);
+			       nfnl_cthelper_expect_pol, NULL);
 	if (err < 0)
 		return err;
 
@@ -336,7 +338,7 @@ static int nfnl_cthelper_update_policy(struct nf_conntrack_helper *helper,
 	int err;
 
 	err = nla_parse_nested(tb, NFCTH_POLICY_SET_MAX, attr,
-			       nfnl_cthelper_expect_policy_set);
+			       nfnl_cthelper_expect_policy_set, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index 57c2cdf7b691..0a3510e7e396 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -56,7 +56,8 @@ ctnl_timeout_parse_policy(void *timeouts, struct nf_conntrack_l4proto *l4proto,
 		struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1];
 
 		ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
-				       attr, l4proto->ctnl_timeout.nla_policy);
+				       attr, l4proto->ctnl_timeout.nla_policy,
+				       NULL);
 		if (ret < 0)
 			return ret;
 
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 933509ebf3d3..3be6fef30581 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -1109,7 +1109,7 @@ static int nfqa_parse_bridge(struct nf_queue_entry *entry,
 		int err;
 
 		err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN],
-				       nfqa_vlan_policy);
+				       nfqa_vlan_policy, NULL);
 		if (err < 0)
 			return err;
 
diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index fab6bf3f955e..d76d0f36799f 100644
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -200,7 +200,7 @@ static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
 	int err;
 
 	err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr,
-			       nft_rule_compat_policy);
+			       nft_rule_compat_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index 4149d3e63589..9aacf2da3d98 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -101,7 +101,7 @@ static int netlbl_cipsov4_add_common(struct genl_info *info,
 
 	if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
 				NLBL_CIPSOV4_A_MAX,
-				netlbl_cipsov4_genl_policy) != 0)
+				netlbl_cipsov4_genl_policy, NULL) != 0)
 		return -EINVAL;
 
 	nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
@@ -148,7 +148,7 @@ static int netlbl_cipsov4_add_std(struct genl_info *info,
 
 	if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 				NLBL_CIPSOV4_A_MAX,
-				netlbl_cipsov4_genl_policy) != 0)
+				netlbl_cipsov4_genl_policy, NULL) != 0)
 		return -EINVAL;
 
 	doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
@@ -170,10 +170,10 @@ static int netlbl_cipsov4_add_std(struct genl_info *info,
 			    info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 			    nla_a_rem)
 		if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
-			if (nla_validate_nested(nla_a,
-					    NLBL_CIPSOV4_A_MAX,
-					    netlbl_cipsov4_genl_policy) != 0)
-					goto add_std_failure;
+			if (nla_validate_nested(nla_a, NLBL_CIPSOV4_A_MAX,
+						netlbl_cipsov4_genl_policy,
+						NULL) != 0)
+				goto add_std_failure;
 			nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 				switch (nla_type(nla_b)) {
 				case NLBL_CIPSOV4_A_MLSLVLLOC:
@@ -236,7 +236,7 @@ static int netlbl_cipsov4_add_std(struct genl_info *info,
 	if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
 		if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 					NLBL_CIPSOV4_A_MAX,
-					netlbl_cipsov4_genl_policy) != 0)
+					netlbl_cipsov4_genl_policy, NULL) != 0)
 			goto add_std_failure;
 
 		nla_for_each_nested(nla_a,
@@ -244,8 +244,9 @@ static int netlbl_cipsov4_add_std(struct genl_info *info,
 				    nla_a_rem)
 			if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 				if (nla_validate_nested(nla_a,
-					      NLBL_CIPSOV4_A_MAX,
-					      netlbl_cipsov4_genl_policy) != 0)
+							NLBL_CIPSOV4_A_MAX,
+							netlbl_cipsov4_genl_policy,
+							NULL) != 0)
 					goto add_std_failure;
 				nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 					switch (nla_type(nla_b)) {
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 4b598a5999a2..ff6db5e66eb5 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -574,7 +574,7 @@ static int genl_family_rcv_msg(const struct genl_family *family,
 
 	if (attrbuf) {
 		err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
-				  ops->policy);
+				  ops->policy, NULL);
 		if (err < 0)
 			goto out;
 	}
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 03f3d5c7beb8..aca903c12671 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -119,7 +119,8 @@ static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 	u32 idx;
 
 	rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
-			 attrbuf, nfc_genl_family.maxattr, nfc_genl_policy);
+			 attrbuf, nfc_genl_family.maxattr, nfc_genl_policy,
+			 NULL);
 	if (rc < 0)
 		return ERR_PTR(rc);
 
@@ -1161,7 +1162,7 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
 
 	nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
 		rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
-				      nfc_sdp_genl_policy);
+				      nfc_sdp_genl_policy, NULL);
 
 		if (rc != 0) {
 			rc = -EINVAL;
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 9c62b6325f7a..7b17da9a94a0 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1353,7 +1353,7 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	int err;
 
 	err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
-			    OVS_FLOW_ATTR_MAX, flow_policy);
+			    OVS_FLOW_ATTR_MAX, flow_policy, NULL);
 	if (err)
 		return err;
 	ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index df82b81a9b35..7e1d8a2afa63 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -2427,8 +2427,8 @@ static int validate_userspace(const struct nlattr *attr)
 	struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
 	int error;
 
-	error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
-				 attr, userspace_policy);
+	error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, attr,
+				 userspace_policy, NULL);
 	if (error)
 		return error;
 
diff --git a/net/openvswitch/vport-vxlan.c b/net/openvswitch/vport-vxlan.c
index 7eb955e453e6..869acb3b3d3f 100644
--- a/net/openvswitch/vport-vxlan.c
+++ b/net/openvswitch/vport-vxlan.c
@@ -70,7 +70,8 @@ static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
 	if (nla_len(attr) < sizeof(struct nlattr))
 		return -EINVAL;
 
-	err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
+	err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
index bc5ee5fbe6ae..363799bf97f6 100644
--- a/net/phonet/pn_netlink.c
+++ b/net/phonet/pn_netlink.c
@@ -78,7 +78,8 @@ static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
 
 	ASSERT_RTNL();
 
-	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy,
+			  NULL);
 	if (err < 0)
 		return err;
 
@@ -243,7 +244,8 @@ static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
 
 	ASSERT_RTNL();
 
-	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
+	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy,
+			  NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index ae5ac175b2be..7fdbb34002f5 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -957,7 +957,7 @@ static int qrtr_addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
 
 	ASSERT_RTNL();
 
-	rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, qrtr_policy);
+	rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, qrtr_policy, NULL);
 	if (rc < 0)
 		return rc;
 
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index b70aa57319ea..79d875c6e8a0 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -557,7 +557,7 @@ struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
 	int err;
 
 	if (name == NULL) {
-		err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
+		err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
 		if (err < 0)
 			goto err_out;
 		err = -EINVAL;
@@ -654,7 +654,7 @@ int tcf_action_init(struct net *net, struct nlattr *nla, struct nlattr *est,
 	int err;
 	int i;
 
-	err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
+	err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
 	if (err < 0)
 		return err;
 
@@ -786,7 +786,7 @@ static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
 	int index;
 	int err;
 
-	err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
+	err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
 	if (err < 0)
 		goto err_out;
 
@@ -835,7 +835,7 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
 
 	b = skb_tail_pointer(skb);
 
-	err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
+	err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
 	if (err < 0)
 		goto err_out;
 
@@ -921,7 +921,7 @@ tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
 	struct tc_action *act;
 	LIST_HEAD(actions);
 
-	ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
+	ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
 	if (ret < 0)
 		return ret;
 
@@ -1004,7 +1004,8 @@ static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
 	    !netlink_capable(skb, CAP_NET_ADMIN))
 		return -EPERM;
 
-	ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
+	ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL,
+			  NULL);
 	if (ret < 0)
 		return ret;
 
@@ -1051,19 +1052,20 @@ static struct nlattr *find_dump_kind(const struct nlmsghdr *n)
 	struct nlattr *nla[TCAA_MAX + 1];
 	struct nlattr *kind;
 
-	if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
+	if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX,
+			NULL, NULL) < 0)
 		return NULL;
 	tb1 = nla[TCA_ACT_TAB];
 	if (tb1 == NULL)
 		return NULL;
 
 	if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
-		      NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
+		      NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
 		return NULL;
 
 	if (tb[1] == NULL)
 		return NULL;
-	if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL) < 0)
+	if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
 		return NULL;
 	kind = tb2[TCA_ACT_KIND];
 
diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
index 520baa41cba3..d33947d6e9d0 100644
--- a/net/sched/act_bpf.c
+++ b/net/sched/act_bpf.c
@@ -283,7 +283,7 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
 	if (!nla)
 		return -EINVAL;
 
-	ret = nla_parse_nested(tb, TCA_ACT_BPF_MAX, nla, act_bpf_policy);
+	ret = nla_parse_nested(tb, TCA_ACT_BPF_MAX, nla, act_bpf_policy, NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
index f9bb43c25697..2155bc6c6a1e 100644
--- a/net/sched/act_connmark.c
+++ b/net/sched/act_connmark.c
@@ -109,7 +109,8 @@ static int tcf_connmark_init(struct net *net, struct nlattr *nla,
 	if (!nla)
 		return -EINVAL;
 
-	ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy);
+	ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy,
+			       NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
index 6c319a40c1cc..ab6fdbd34db7 100644
--- a/net/sched/act_csum.c
+++ b/net/sched/act_csum.c
@@ -59,7 +59,7 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy);
+	err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index e6c874a2b283..99afe8b1f1fb 100644
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -73,7 +73,7 @@ static int tcf_gact_init(struct net *net, struct nlattr *nla,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
+	err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
index c75ea5c9102c..c5dec308b8b1 100644
--- a/net/sched/act_ife.c
+++ b/net/sched/act_ife.c
@@ -443,7 +443,7 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
 	int ret = 0;
 	int err;
 
-	err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy);
+	err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -514,7 +514,7 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
 
 	if (tb[TCA_IFE_METALST]) {
 		err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
-				       NULL);
+				       NULL, NULL);
 		if (err) {
 metadata_parse_err:
 			if (exists)
diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index 992ef8d624f1..36f0ced9e60c 100644
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -107,7 +107,7 @@ static int __tcf_ipt_init(struct tc_action_net *tn, struct nlattr *nla,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
+	err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index af49c7dca860..1b5549ababd4 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -87,7 +87,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 
 	if (nla == NULL)
 		return -EINVAL;
-	ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
+	ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy, NULL);
 	if (ret < 0)
 		return ret;
 	if (tb[TCA_MIRRED_PARMS] == NULL)
diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index 9b6aec665495..9016ab8a0649 100644
--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -50,7 +50,7 @@ static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_NAT_MAX, nla, nat_policy);
+	err = nla_parse_nested(tb, TCA_NAT_MAX, nla, nat_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index c1310472f620..164b5ac094be 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -72,7 +72,7 @@ static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
 		}
 
 		err = nla_parse_nested(tb, TCA_PEDIT_KEY_EX_MAX, ka,
-				       pedit_key_ex_policy);
+				       pedit_key_ex_policy, NULL);
 		if (err)
 			goto err_out;
 
@@ -147,7 +147,7 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy);
+	err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 0ba91d1ce994..f42008b29311 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -90,7 +90,7 @@ static int tcf_act_police_init(struct net *net, struct nlattr *nla,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
+	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
index 0b8217b4763f..59d6645a4007 100644
--- a/net/sched/act_sample.c
+++ b/net/sched/act_sample.c
@@ -50,7 +50,7 @@ static int tcf_sample_init(struct net *net, struct nlattr *nla,
 
 	if (!nla)
 		return -EINVAL;
-	ret = nla_parse_nested(tb, TCA_SAMPLE_MAX, nla, sample_policy);
+	ret = nla_parse_nested(tb, TCA_SAMPLE_MAX, nla, sample_policy, NULL);
 	if (ret < 0)
 		return ret;
 	if (!tb[TCA_SAMPLE_PARMS] || !tb[TCA_SAMPLE_RATE] ||
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 823a73ad0c60..43605e7ce051 100644
--- a/net/sched/act_simple.c
+++ b/net/sched/act_simple.c
@@ -94,7 +94,7 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
+	err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
index 06ccae3c12ee..6b3e65d7de0c 100644
--- a/net/sched/act_skbedit.c
+++ b/net/sched/act_skbedit.c
@@ -82,7 +82,7 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 	if (nla == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
+	err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_skbmod.c b/net/sched/act_skbmod.c
index c736627f8f4a..a73c4bbcada2 100644
--- a/net/sched/act_skbmod.c
+++ b/net/sched/act_skbmod.c
@@ -103,7 +103,7 @@ static int tcf_skbmod_init(struct net *net, struct nlattr *nla,
 	if (!nla)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_SKBMOD_MAX, nla, skbmod_policy);
+	err = nla_parse_nested(tb, TCA_SKBMOD_MAX, nla, skbmod_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index e3a58e021198..b9a2f241a5b3 100644
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -89,7 +89,8 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 	if (!nla)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy);
+	err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
index 19e0dba305ce..13ba3a89f675 100644
--- a/net/sched/act_vlan.c
+++ b/net/sched/act_vlan.c
@@ -121,7 +121,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
 	if (!nla)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
+	err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 732f7cae459d..e2c68c30f97d 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -229,7 +229,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 replay:
 	tp_created = 0;
 
-	err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL);
+	err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index 5877f6061b57..422414f16b38 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -174,7 +174,7 @@ static int basic_change(struct net *net, struct sk_buff *in_skb,
 		return -EINVAL;
 
 	err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
-			       basic_policy);
+			       basic_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 80f688436dd7..7ddd08efaa0f 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -478,7 +478,8 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
 	if (tca[TCA_OPTIONS] == NULL)
 		return -EINVAL;
 
-	ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy);
+	ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy,
+			       NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index c1f20077837f..b5e7c1bee6c3 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -99,7 +99,7 @@ static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
 	new->handle = handle;
 	new->tp = tp;
 	err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS],
-			       cgroup_policy);
+			       cgroup_policy, NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index ca193af8634a..008ba7e63b7a 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -400,7 +400,7 @@ static int flow_change(struct net *net, struct sk_buff *in_skb,
 	if (opt == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
+	err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 9d0c99d2e9fb..3e7bd7801aa8 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -848,7 +848,8 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	if (!tb)
 		return -ENOBUFS;
 
-	err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy);
+	err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS],
+			       fl_policy, NULL);
 	if (err < 0)
 		goto errout_tb;
 
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index 9dc63d54e167..996209083c6b 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -250,7 +250,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
 	if (!opt)
 		return handle ? -EINVAL : 0; /* Succeed if it is old method. */
 
-	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
+	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 224eb2c14346..0dbcca62aa6a 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -161,8 +161,8 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
 	if (head)
 		return -EEXIST;
 
-	err = nla_parse_nested(tb, TCA_MATCHALL_MAX,
-			       tca[TCA_OPTIONS], mall_policy);
+	err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
+			       mall_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index 455fc8f83d0a..a371075c1d7a 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -489,7 +489,7 @@ static int route4_change(struct net *net, struct sk_buff *in_skb,
 	if (opt == NULL)
 		return handle ? -EINVAL : 0;
 
-	err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy);
+	err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index 322438fb3ffc..d7f2923e6ebd 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -484,7 +484,7 @@ static int rsvp_change(struct net *net, struct sk_buff *in_skb,
 	if (opt == NULL)
 		return handle ? -EINVAL : 0;
 
-	err = nla_parse_nested(tb, TCA_RSVP_MAX, opt, rsvp_policy);
+	err = nla_parse_nested(tb, TCA_RSVP_MAX, opt, rsvp_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index 0751245a6ace..2ab001361457 100644
--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -482,7 +482,7 @@ tcindex_change(struct net *net, struct sk_buff *in_skb,
 	if (!opt)
 		return 0;
 
-	err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy);
+	err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 4dbe0c680fe6..9e2f330ac80f 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -860,7 +860,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 	if (opt == NULL)
 		return handle ? -EINVAL : 0;
 
-	err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
+	err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
index ae7e4f5b348b..eb0e9bab54c1 100644
--- a/net/sched/em_meta.c
+++ b/net/sched/em_meta.c
@@ -912,7 +912,7 @@ static int em_meta_change(struct net *net, void *data, int len,
 	struct tcf_meta_hdr *hdr;
 	struct meta_match *meta = NULL;
 
-	err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
+	err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy, NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/sched/ematch.c b/net/sched/ematch.c
index fbb7ebfc58c6..03b677bc0700 100644
--- a/net/sched/ematch.c
+++ b/net/sched/ematch.c
@@ -314,7 +314,7 @@ int tcf_em_tree_validate(struct tcf_proto *tp, struct nlattr *nla,
 	if (!nla)
 		return 0;
 
-	err = nla_parse_nested(tb, TCA_EMATCH_TREE_MAX, nla, em_policy);
+	err = nla_parse_nested(tb, TCA_EMATCH_TREE_MAX, nla, em_policy, NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 62567bfe52c7..fcb5ae581c04 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -457,7 +457,7 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
 	u16 *tab = NULL;
 	int err;
 
-	err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy);
+	err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, NULL);
 	if (err < 0)
 		return ERR_PTR(err);
 	if (!tb[TCA_STAB_BASE])
@@ -1131,7 +1131,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
 	    !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
 
-	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
+	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
 	if (err < 0)
 		return err;
 
@@ -1200,7 +1200,7 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
 
 replay:
 	/* Reinit, just in case something touches this. */
-	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
+	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
 	if (err < 0)
 		return err;
 
@@ -1515,7 +1515,7 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
 	idx = 0;
 	ASSERT_RTNL();
 
-	err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX, NULL);
+	err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
 	if (err < 0)
 		return err;
 
@@ -1577,7 +1577,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
 	    !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
 
-	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
+	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index 2209c2ddacbf..40cbceed4de8 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -214,7 +214,7 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 	if (opt == NULL)
 		return -EINVAL;
 
-	error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
+	error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy, NULL);
 	if (error < 0)
 		return error;
 
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index cf93e5ff3d63..7415859fd4c3 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1137,7 +1137,7 @@ static int cbq_init(struct Qdisc *sch, struct nlattr *opt)
 	struct tc_ratespec *r;
 	int err;
 
-	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
+	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -1474,7 +1474,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
 	if (opt == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
+	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 593183a5b5b5..d00f4c7c2f3a 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -357,7 +357,7 @@ static int choke_change(struct Qdisc *sch, struct nlattr *opt)
 	if (opt == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_CHOKE_MAX, opt, choke_policy);
+	err = nla_parse_nested(tb, TCA_CHOKE_MAX, opt, choke_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_codel.c b/net/sched/sch_codel.c
index 5bfa79ee657c..c518a1efcb9d 100644
--- a/net/sched/sch_codel.c
+++ b/net/sched/sch_codel.c
@@ -140,7 +140,7 @@ static int codel_change(struct Qdisc *sch, struct nlattr *opt)
 	if (!opt)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_CODEL_MAX, opt, codel_policy);
+	err = nla_parse_nested(tb, TCA_CODEL_MAX, opt, codel_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 9fe67e257dfa..58a8c32eab23 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -76,7 +76,7 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 	if (!opt)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_DRR_MAX, opt, drr_policy);
+	err = nla_parse_nested(tb, TCA_DRR_MAX, opt, drr_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index cfa1f2cdbaf7..1c0f877f673a 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -129,7 +129,7 @@ static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
 	if (!opt)
 		goto errout;
 
-	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
+	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy, NULL);
 	if (err < 0)
 		goto errout;
 
@@ -342,7 +342,7 @@ static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
 	if (!opt)
 		goto errout;
 
-	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
+	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy, NULL);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index a4f738ac7728..da4f67bda0ee 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -698,7 +698,7 @@ static int fq_change(struct Qdisc *sch, struct nlattr *opt)
 	if (!opt)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_FQ_MAX, opt, fq_policy);
+	err = nla_parse_nested(tb, TCA_FQ_MAX, opt, fq_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index 097bbe9857a5..18bbb5476c83 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -383,7 +383,8 @@ static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt)
 	if (!opt)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_FQ_CODEL_MAX, opt, fq_codel_policy);
+	err = nla_parse_nested(tb, TCA_FQ_CODEL_MAX, opt, fq_codel_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 	if (tb[TCA_FQ_CODEL_FLOWS]) {
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index c78a093c551a..17c7130454bd 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -401,7 +401,7 @@ static int gred_change(struct Qdisc *sch, struct nlattr *opt)
 	if (opt == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy);
+	err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -470,7 +470,7 @@ static int gred_init(struct Qdisc *sch, struct nlattr *opt)
 	if (opt == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy);
+	err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 0198c6cdda49..5cb82f6c1b06 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -957,7 +957,7 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 	if (opt == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_HFSC_MAX, opt, hfsc_policy);
+	err = nla_parse_nested(tb, TCA_HFSC_MAX, opt, hfsc_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_hhf.c b/net/sched/sch_hhf.c
index 2fae8b5f1b80..c19d346e6c5a 100644
--- a/net/sched/sch_hhf.c
+++ b/net/sched/sch_hhf.c
@@ -529,7 +529,7 @@ static int hhf_change(struct Qdisc *sch, struct nlattr *opt)
 	if (!opt)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_HHF_MAX, opt, hhf_policy);
+	err = nla_parse_nested(tb, TCA_HHF_MAX, opt, hhf_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 95867033542e..570ef3b0c09b 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1017,7 +1017,7 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt)
 	if (!opt)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy);
+	err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy, NULL);
 	if (err < 0)
 		return err;
 
@@ -1342,7 +1342,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 	if (!opt)
 		goto failure;
 
-	err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy);
+	err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy, NULL);
 	if (err < 0)
 		goto failure;
 
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 94b4928ad413..f0ce4780f395 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -843,7 +843,7 @@ static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
 
 	if (nested_len >= nla_attr_size(0))
 		return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len),
-				 nested_len, policy);
+				 nested_len, policy, NULL);
 
 	memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
 	return 0;
diff --git a/net/sched/sch_pie.c b/net/sched/sch_pie.c
index 5c3a99d6aa82..6c2791d6102d 100644
--- a/net/sched/sch_pie.c
+++ b/net/sched/sch_pie.c
@@ -190,7 +190,7 @@ static int pie_change(struct Qdisc *sch, struct nlattr *opt)
 	if (!opt)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_PIE_MAX, opt, pie_policy);
+	err = nla_parse_nested(tb, TCA_PIE_MAX, opt, pie_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 6c85f3e9239b..041eba3006cc 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -418,7 +418,8 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 		return -EINVAL;
 	}
 
-	err = nla_parse_nested(tb, TCA_QFQ_MAX, tca[TCA_OPTIONS], qfq_policy);
+	err = nla_parse_nested(tb, TCA_QFQ_MAX, tca[TCA_OPTIONS], qfq_policy,
+			       NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 799ea6dd69b2..11292adce412 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -173,7 +173,7 @@ static int red_change(struct Qdisc *sch, struct nlattr *opt)
 	if (opt == NULL)
 		return -EINVAL;
 
-	err = nla_parse_nested(tb, TCA_RED_MAX, opt, red_policy);
+	err = nla_parse_nested(tb, TCA_RED_MAX, opt, red_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index ae862f172c94..0f777273ba29 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -495,7 +495,7 @@ static int sfb_change(struct Qdisc *sch, struct nlattr *opt)
 	int err;
 
 	if (opt) {
-		err = nla_parse_nested(tb, TCA_SFB_MAX, opt, sfb_policy);
+		err = nla_parse_nested(tb, TCA_SFB_MAX, opt, sfb_policy, NULL);
 		if (err < 0)
 			return -EINVAL;
 
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 9850126129a3..b2e4b6ad241a 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -315,7 +315,7 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt)
 	s64 buffer, mtu;
 	u64 rate64 = 0, prate64 = 0;
 
-	err = nla_parse_nested(tb, TCA_TBF_MAX, opt, tbf_policy);
+	err = nla_parse_nested(tb, TCA_TBF_MAX, opt, tbf_policy, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 017801f9dbaa..8d40a7d31c99 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -826,7 +826,7 @@ static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
 	int err;
 
 	err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
-				  switchdev_port_bridge_policy);
+				  switchdev_port_bridge_policy, NULL);
 	if (err)
 		return err;
 
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 33a5bdfbef76..9b5c45f48f60 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -802,7 +802,7 @@ int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy);
+			       tipc_nl_bearer_policy, NULL);
 	if (err)
 		return err;
 
@@ -851,7 +851,7 @@ int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy);
+			       tipc_nl_bearer_policy, NULL);
 	if (err)
 		return err;
 
@@ -891,7 +891,7 @@ int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy);
+			       tipc_nl_bearer_policy, NULL);
 	if (err)
 		return err;
 
@@ -939,7 +939,7 @@ int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy);
+			       tipc_nl_bearer_policy, NULL);
 	if (err)
 		return err;
 
@@ -982,7 +982,7 @@ int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy);
+			       tipc_nl_bearer_policy, NULL);
 	if (err)
 		return err;
 
@@ -1104,7 +1104,7 @@ int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 			       info->attrs[TIPC_NLA_MEDIA],
-			       tipc_nl_media_policy);
+			       tipc_nl_media_policy, NULL);
 	if (err)
 		return err;
 
@@ -1152,7 +1152,7 @@ int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 			       info->attrs[TIPC_NLA_MEDIA],
-			       tipc_nl_media_policy);
+			       tipc_nl_media_policy, NULL);
 
 	if (!attrs[TIPC_NLA_MEDIA_NAME])
 		return -EINVAL;
diff --git a/net/tipc/link.c b/net/tipc/link.c
index ddd2dd6f77aa..60820dc35a08 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1827,7 +1827,7 @@ int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
 	int err;
 
 	err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
-			       tipc_nl_prop_policy);
+			       tipc_nl_prop_policy, NULL);
 	if (err)
 		return err;
 
diff --git a/net/tipc/net.c b/net/tipc/net.c
index ab8a2d5d1e32..836da66cd852 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -211,8 +211,8 @@ int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 
 	err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
-			       info->attrs[TIPC_NLA_NET],
-			       tipc_nl_net_policy);
+			       info->attrs[TIPC_NLA_NET], tipc_nl_net_policy,
+			       NULL);
 	if (err)
 		return err;
 
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index 26ca8dd64ded..b76f13f6fea1 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -268,7 +268,8 @@ int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
 	if (!*attr)
 		return -EOPNOTSUPP;
 
-	return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy);
+	return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy,
+			   NULL);
 }
 
 int __init tipc_netlink_start(void)
diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index e1ae8a8a2b8e..9bfe886ab330 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -296,7 +296,7 @@ static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 
 	err = nla_parse(attrbuf, tipc_genl_family.maxattr,
 			(const struct nlattr *)trans_buf->data,
-			trans_buf->len, NULL);
+			trans_buf->len, NULL, NULL);
 	if (err)
 		goto parse_out;
 
@@ -352,7 +352,7 @@ static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(bearer, TIPC_NLA_BEARER_MAX,
-			       attrs[TIPC_NLA_BEARER], NULL);
+			       attrs[TIPC_NLA_BEARER], NULL, NULL);
 	if (err)
 		return err;
 
@@ -472,7 +472,7 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK],
-			       NULL);
+			       NULL, NULL);
 	if (err)
 		return err;
 
@@ -480,7 +480,7 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(prop, TIPC_NLA_PROP_MAX,
-			       link[TIPC_NLA_LINK_PROP], NULL);
+			       link[TIPC_NLA_LINK_PROP], NULL, NULL);
 	if (err)
 		return err;
 
@@ -488,7 +488,7 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(stats, TIPC_NLA_STATS_MAX,
-			       link[TIPC_NLA_LINK_STATS], NULL);
+			       link[TIPC_NLA_LINK_STATS], NULL, NULL);
 	if (err)
 		return err;
 
@@ -598,7 +598,7 @@ static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK],
-			       NULL);
+			       NULL, NULL);
 	if (err)
 		return err;
 
@@ -795,7 +795,7 @@ static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(nt, TIPC_NLA_NAME_TABLE_MAX,
-			       attrs[TIPC_NLA_NAME_TABLE], NULL);
+			       attrs[TIPC_NLA_NAME_TABLE], NULL, NULL);
 	if (err)
 		return err;
 
@@ -803,7 +803,7 @@ static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(publ, TIPC_NLA_PUBL_MAX,
-			       nt[TIPC_NLA_NAME_TABLE_PUBL], NULL);
+			       nt[TIPC_NLA_NAME_TABLE_PUBL], NULL, NULL);
 	if (err)
 		return err;
 
@@ -863,7 +863,7 @@ static int __tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(publ, TIPC_NLA_PUBL_MAX, attrs[TIPC_NLA_PUBL],
-			       NULL);
+			       NULL, NULL);
 	if (err)
 		return err;
 
@@ -929,7 +929,7 @@ static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, attrs[TIPC_NLA_SOCK],
-			       NULL);
+			       NULL, NULL);
 	if (err)
 		return err;
 
@@ -940,8 +940,8 @@ static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
 		u32 node;
 		struct nlattr *con[TIPC_NLA_CON_MAX + 1];
 
-		nla_parse_nested(con, TIPC_NLA_CON_MAX, sock[TIPC_NLA_SOCK_CON],
-				 NULL);
+		nla_parse_nested(con, TIPC_NLA_CON_MAX,
+				 sock[TIPC_NLA_SOCK_CON], NULL, NULL);
 
 		node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
 		tipc_tlv_sprintf(msg->rep, "  connected to <%u.%u.%u:%u>",
@@ -977,8 +977,8 @@ static int tipc_nl_compat_media_dump(struct tipc_nl_compat_msg *msg,
 	if (!attrs[TIPC_NLA_MEDIA])
 		return -EINVAL;
 
-	err = nla_parse_nested(media, TIPC_NLA_MEDIA_MAX, attrs[TIPC_NLA_MEDIA],
-			       NULL);
+	err = nla_parse_nested(media, TIPC_NLA_MEDIA_MAX,
+			       attrs[TIPC_NLA_MEDIA], NULL, NULL);
 	if (err)
 		return err;
 
@@ -998,7 +998,7 @@ static int tipc_nl_compat_node_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(node, TIPC_NLA_NODE_MAX, attrs[TIPC_NLA_NODE],
-			       NULL);
+			       NULL, NULL);
 	if (err)
 		return err;
 
@@ -1045,7 +1045,7 @@ static int tipc_nl_compat_net_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	err = nla_parse_nested(net, TIPC_NLA_NET_MAX, attrs[TIPC_NLA_NET],
-			       NULL);
+			       NULL, NULL);
 	if (err)
 		return err;
 
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 4512e83652b1..1dcde24c7053 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -1607,8 +1607,8 @@ int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 
 	err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
-			       info->attrs[TIPC_NLA_NET],
-			       tipc_nl_net_policy);
+			       info->attrs[TIPC_NLA_NET], tipc_nl_net_policy,
+			       NULL);
 	if (err)
 		return err;
 
@@ -1774,7 +1774,7 @@ int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
 			       info->attrs[TIPC_NLA_LINK],
-			       tipc_nl_link_policy);
+			       tipc_nl_link_policy, NULL);
 	if (err)
 		return err;
 
@@ -1902,7 +1902,7 @@ int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
 			       info->attrs[TIPC_NLA_LINK],
-			       tipc_nl_link_policy);
+			       tipc_nl_link_policy, NULL);
 	if (err)
 		return err;
 
@@ -2042,7 +2042,7 @@ int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX,
 			       info->attrs[TIPC_NLA_MON],
-			       tipc_nl_monitor_policy);
+			       tipc_nl_monitor_policy, NULL);
 	if (err)
 		return err;
 
@@ -2163,7 +2163,7 @@ int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
 
 		err = nla_parse_nested(mon, TIPC_NLA_MON_MAX,
 				       attrs[TIPC_NLA_MON],
-				       tipc_nl_monitor_policy);
+				       tipc_nl_monitor_policy, NULL);
 		if (err)
 			return err;
 
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 15f6ce7bf868..740100abeec3 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2866,7 +2866,7 @@ int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
 
 		err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
 				       attrs[TIPC_NLA_SOCK],
-				       tipc_nl_sock_policy);
+				       tipc_nl_sock_policy, NULL);
 		if (err)
 			return err;
 
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 46061cf48cd1..ecca64fc6a6f 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -457,7 +457,7 @@ int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
 
 		err = nla_parse_nested(battrs, TIPC_NLA_BEARER_MAX,
 				       attrs[TIPC_NLA_BEARER],
-				       tipc_nl_bearer_policy);
+				       tipc_nl_bearer_policy, NULL);
 		if (err)
 			return err;
 
@@ -609,7 +609,8 @@ int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
 	struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
 	struct udp_media_addr *dst;
 
-	if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy))
+	if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr,
+			     tipc_nl_udp_policy, NULL))
 		return -EINVAL;
 
 	if (!opts[TIPC_NLA_UDP_REMOTE])
@@ -662,7 +663,7 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
 
 	if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
 			     attrs[TIPC_NLA_BEARER_UDP_OPTS],
-			     tipc_nl_udp_policy))
+			     tipc_nl_udp_policy, NULL))
 		goto err;
 
 	if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 2312dc2ffdb9..e7594a3a0ab6 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -548,7 +548,7 @@ static int nl80211_prepare_wdev_dump(struct sk_buff *skb,
 	if (!cb->args[0]) {
 		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
 				  genl_family_attrbuf(&nl80211_fam),
-				  nl80211_fam.maxattr, nl80211_policy);
+				  nl80211_fam.maxattr, nl80211_policy, NULL);
 		if (err)
 			return err;
 
@@ -719,7 +719,7 @@ static int nl80211_parse_key_new(struct nlattr *key, struct key_parse *k)
 {
 	struct nlattr *tb[NL80211_KEY_MAX + 1];
 	int err = nla_parse_nested(tb, NL80211_KEY_MAX, key,
-				   nl80211_key_policy);
+				   nl80211_key_policy, NULL);
 	if (err)
 		return err;
 
@@ -760,7 +760,7 @@ static int nl80211_parse_key_new(struct nlattr *key, struct key_parse *k)
 
 		err = nla_parse_nested(kdt, NUM_NL80211_KEY_DEFAULT_TYPES - 1,
 				       tb[NL80211_KEY_DEFAULT_TYPES],
-				       nl80211_key_default_policy);
+				       nl80211_key_default_policy, NULL);
 		if (err)
 			return err;
 
@@ -807,10 +807,10 @@ static int nl80211_parse_key_old(struct genl_info *info, struct key_parse *k)
 
 	if (info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES]) {
 		struct nlattr *kdt[NUM_NL80211_KEY_DEFAULT_TYPES];
-		int err = nla_parse_nested(
-				kdt, NUM_NL80211_KEY_DEFAULT_TYPES - 1,
-				info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES],
-				nl80211_key_default_policy);
+		int err = nla_parse_nested(kdt,
+					   NUM_NL80211_KEY_DEFAULT_TYPES - 1,
+					   info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES],
+					   nl80211_key_default_policy, NULL);
 		if (err)
 			return err;
 
@@ -1892,8 +1892,8 @@ static int nl80211_dump_wiphy_parse(struct sk_buff *skb,
 				    struct nl80211_dump_wiphy_state *state)
 {
 	struct nlattr **tb = genl_family_attrbuf(&nl80211_fam);
-	int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
-			      tb, nl80211_fam.maxattr, nl80211_policy);
+	int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize, tb,
+			      nl80211_fam.maxattr, nl80211_policy, NULL);
 	/* ignore parse errors for backward compatibility */
 	if (ret)
 		return 0;
@@ -2308,7 +2308,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 				    rem_txq_params) {
 			result = nla_parse_nested(tb, NL80211_TXQ_ATTR_MAX,
 						  nl_txq_params,
-						  txq_params_policy);
+						  txq_params_policy, NULL);
 			if (result)
 				return result;
 			result = parse_txq_params(tb, &txq_params);
@@ -2695,8 +2695,8 @@ static int parse_monitor_flags(struct nlattr *nla, u32 *mntrflags)
 	if (!nla)
 		return -EINVAL;
 
-	if (nla_parse_nested(flags, NL80211_MNTR_FLAG_MAX,
-			     nla, mntr_flags_policy))
+	if (nla_parse_nested(flags, NL80211_MNTR_FLAG_MAX, nla,
+			     mntr_flags_policy, NULL))
 		return -EINVAL;
 
 	for (flag = 1; flag <= NL80211_MNTR_FLAG_MAX; flag++)
@@ -3561,7 +3561,7 @@ static int nl80211_parse_tx_bitrate_mask(struct genl_info *info,
 		if (sband == NULL)
 			return -EINVAL;
 		err = nla_parse_nested(tb, NL80211_TXRATE_MAX, tx_rates,
-				       nl80211_txattr_policy);
+				       nl80211_txattr_policy, NULL);
 		if (err)
 			return err;
 		if (tb[NL80211_TXRATE_LEGACY]) {
@@ -4100,8 +4100,8 @@ static int parse_station_flags(struct genl_info *info,
 	if (!nla)
 		return 0;
 
-	if (nla_parse_nested(flags, NL80211_STA_FLAG_MAX,
-			     nla, sta_flags_policy))
+	if (nla_parse_nested(flags, NL80211_STA_FLAG_MAX, nla,
+			     sta_flags_policy, NULL))
 		return -EINVAL;
 
 	/*
@@ -4728,7 +4728,7 @@ static int nl80211_parse_sta_wme(struct genl_info *info,
 
 	nla = info->attrs[NL80211_ATTR_STA_WME];
 	err = nla_parse_nested(tb, NL80211_STA_WME_MAX, nla,
-			       nl80211_sta_wme_policy);
+			       nl80211_sta_wme_policy, NULL);
 	if (err)
 		return err;
 
@@ -5853,7 +5853,7 @@ do {									    \
 		return -EINVAL;
 	if (nla_parse_nested(tb, NL80211_MESHCONF_ATTR_MAX,
 			     info->attrs[NL80211_ATTR_MESH_CONFIG],
-			     nl80211_meshconf_params_policy))
+			     nl80211_meshconf_params_policy, NULL))
 		return -EINVAL;
 
 	/* This makes sure that there aren't more than 32 mesh config
@@ -6002,7 +6002,7 @@ static int nl80211_parse_mesh_setup(struct genl_info *info,
 		return -EINVAL;
 	if (nla_parse_nested(tb, NL80211_MESH_SETUP_ATTR_MAX,
 			     info->attrs[NL80211_ATTR_MESH_SETUP],
-			     nl80211_mesh_setup_params_policy))
+			     nl80211_mesh_setup_params_policy, NULL))
 		return -EINVAL;
 
 	if (tb[NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC])
@@ -6393,7 +6393,7 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
 			    rem_reg_rules) {
 		r = nla_parse_nested(tb, NL80211_REG_RULE_ATTR_MAX,
-				     nl_reg_rule, reg_rule_policy);
+				     nl_reg_rule, reg_rule_policy, NULL);
 		if (r)
 			goto bad_reg;
 		r = parse_reg_rule(tb, &rd->reg_rules[rule_idx]);
@@ -6461,7 +6461,7 @@ static int parse_bss_select(struct nlattr *nla, struct wiphy *wiphy,
 		return -EINVAL;
 
 	err = nla_parse_nested(attr, NL80211_BSS_SELECT_ATTR_MAX, nest,
-			       nl80211_bss_select_policy);
+			       nl80211_bss_select_policy, NULL);
 	if (err)
 		return err;
 
@@ -6862,7 +6862,7 @@ nl80211_parse_sched_scan_plans(struct wiphy *wiphy, int n_plans,
 			return -EINVAL;
 
 		err = nla_parse_nested(plan, NL80211_SCHED_SCAN_PLAN_MAX,
-				       attr, nl80211_plan_policy);
+				       attr, nl80211_plan_policy, NULL);
 		if (err)
 			return err;
 
@@ -6953,7 +6953,8 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
 
 			err = nla_parse_nested(tb,
 					       NL80211_SCHED_SCAN_MATCH_ATTR_MAX,
-					       attr, nl80211_match_policy);
+					       attr, nl80211_match_policy,
+					       NULL);
 			if (err)
 				return ERR_PTR(err);
 			/* add other standalone attributes here */
@@ -7132,7 +7133,8 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
 
 			err = nla_parse_nested(tb,
 					       NL80211_SCHED_SCAN_MATCH_ATTR_MAX,
-					       attr, nl80211_match_policy);
+					       attr, nl80211_match_policy,
+					       NULL);
 			if (err)
 				goto out_free;
 			ssid = tb[NL80211_SCHED_SCAN_MATCH_ATTR_SSID];
@@ -7433,7 +7435,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(csa_attrs, NL80211_ATTR_MAX,
 			       info->attrs[NL80211_ATTR_CSA_IES],
-			       nl80211_policy);
+			       nl80211_policy, NULL);
 	if (err)
 		return err;
 
@@ -8639,7 +8641,8 @@ static int nl80211_testmode_dump(struct sk_buff *skb,
 		struct nlattr **attrbuf = genl_family_attrbuf(&nl80211_fam);
 
 		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
-				  attrbuf, nl80211_fam.maxattr, nl80211_policy);
+				  attrbuf, nl80211_fam.maxattr,
+				  nl80211_policy, NULL);
 		if (err)
 			goto out_err;
 
@@ -9530,7 +9533,7 @@ static int nl80211_set_cqm(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 
 	err = nla_parse_nested(attrs, NL80211_ATTR_CQM_MAX, cqm,
-			       nl80211_attr_cqm_policy);
+			       nl80211_attr_cqm_policy, NULL);
 	if (err)
 		return err;
 
@@ -9940,7 +9943,7 @@ static int nl80211_parse_wowlan_tcp(struct cfg80211_registered_device *rdev,
 		return -EINVAL;
 
 	err = nla_parse_nested(tb, MAX_NL80211_WOWLAN_TCP, attr,
-			       nl80211_wowlan_tcp_policy);
+			       nl80211_wowlan_tcp_policy, NULL);
 	if (err)
 		return err;
 
@@ -10085,7 +10088,8 @@ static int nl80211_parse_wowlan_nd(struct cfg80211_registered_device *rdev,
 		goto out;
 	}
 
-	err = nla_parse_nested(tb, NL80211_ATTR_MAX, attr, nl80211_policy);
+	err = nla_parse_nested(tb, NL80211_ATTR_MAX, attr, nl80211_policy,
+			       NULL);
 	if (err)
 		goto out;
 
@@ -10122,7 +10126,7 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(tb, MAX_NL80211_WOWLAN_TRIG,
 			       info->attrs[NL80211_ATTR_WOWLAN_TRIGGERS],
-			       nl80211_wowlan_policy);
+			       nl80211_wowlan_policy, NULL);
 	if (err)
 		return err;
 
@@ -10205,7 +10209,7 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
 			u8 *mask_pat;
 
 			nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat,
-					 NULL);
+					 NULL, NULL);
 			err = -EINVAL;
 			if (!pat_tb[NL80211_PKTPAT_MASK] ||
 			    !pat_tb[NL80211_PKTPAT_PATTERN])
@@ -10416,7 +10420,7 @@ static int nl80211_parse_coalesce_rule(struct cfg80211_registered_device *rdev,
 	struct nlattr *pat_tb[NUM_NL80211_PKTPAT];
 
 	err = nla_parse_nested(tb, NL80211_ATTR_COALESCE_RULE_MAX, rule,
-			       nl80211_coalesce_policy);
+			       nl80211_coalesce_policy, NULL);
 	if (err)
 		return err;
 
@@ -10454,7 +10458,7 @@ static int nl80211_parse_coalesce_rule(struct cfg80211_registered_device *rdev,
 			    rem) {
 		u8 *mask_pat;
 
-		nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat, NULL);
+		nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat, NULL, NULL);
 		if (!pat_tb[NL80211_PKTPAT_MASK] ||
 		    !pat_tb[NL80211_PKTPAT_PATTERN])
 			return -EINVAL;
@@ -10575,7 +10579,7 @@ static int nl80211_set_rekey_data(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(tb, MAX_NL80211_REKEY_DATA,
 			       info->attrs[NL80211_ATTR_REKEY_DATA],
-			       nl80211_rekey_policy);
+			       nl80211_rekey_policy, NULL);
 	if (err)
 		return err;
 
@@ -10892,7 +10896,7 @@ static int nl80211_nan_add_func(struct sk_buff *skb,
 
 	err = nla_parse_nested(tb, NL80211_NAN_FUNC_ATTR_MAX,
 			       info->attrs[NL80211_ATTR_NAN_FUNC],
-			       nl80211_nan_func_policy);
+			       nl80211_nan_func_policy, NULL);
 	if (err)
 		return err;
 
@@ -10989,7 +10993,7 @@ static int nl80211_nan_add_func(struct sk_buff *skb,
 
 		err = nla_parse_nested(srf_tb, NL80211_NAN_SRF_ATTR_MAX,
 				       tb[NL80211_NAN_FUNC_SRF],
-				       nl80211_nan_srf_policy);
+				       nl80211_nan_srf_policy, NULL);
 		if (err)
 			goto out;
 
@@ -11524,8 +11528,8 @@ static int nl80211_prepare_vendor_dump(struct sk_buff *skb,
 		return 0;
 	}
 
-	err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
-			  attrbuf, nl80211_fam.maxattr, nl80211_policy);
+	err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize, attrbuf,
+			  nl80211_fam.maxattr, nl80211_policy, NULL);
 	if (err)
 		return err;
 
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 1ba8c115a993..0db72dd82c7e 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -932,8 +932,8 @@ static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
 		u8 proto = 0;
 		int err;
 
-		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
-				  xfrma_policy);
+		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
+				  NULL);
 		if (err < 0)
 			return err;
 
@@ -2489,7 +2489,7 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
 			  link->nla_max ? : XFRMA_MAX,
-			  link->nla_pol ? : xfrma_policy);
+			  link->nla_pol ? : xfrma_policy, NULL);
 	if (err < 0)
 		return err;
 
-- 
2.11.0

[PATCH v3 5/5] netlink: pass extended ACK struct where available

[Johannes Berg]

From: Johannes Berg <johannes.berg@intel.com>

This is an add-on to the previous patch that passes
the extended ACK structure where it's already available
by existing genl_info or extack function arguments.

This was done with this spatch (with some manual
adjustment of indentation):

@@
expression A, B, C, D, E;
identifier fn, info;
@@
fn(..., struct genl_info *info, ...) {
...
-nlmsg_parse(A, B, C, D, E, NULL)
+nlmsg_parse(A, B, C, D, E, info->extack)
...
}

@@
expression A, B, C, D, E;
identifier fn, info;
@@
fn(..., struct genl_info *info, ...) {
<...
-nla_parse_nested(A, B, C, D, NULL)
+nla_parse_nested(A, B, C, D, info->extack)
...>
}

@@
expression A, B, C, D, E;
identifier fn, extack;
@@
fn(..., struct netlink_ext_ack *extack, ...) {
<...
-nlmsg_parse(A, B, C, D, E, NULL)
+nlmsg_parse(A, B, C, D, E, extack)
...>
}

@@
expression A, B, C, D, E;
identifier fn, extack;
@@
fn(..., struct netlink_ext_ack *extack, ...) {
<...
-nla_parse(A, B, C, D, E, NULL)
+nla_parse(A, B, C, D, E, extack)
...>
}

@@
expression A, B, C, D, E;
identifier fn, extack;
@@
fn(..., struct netlink_ext_ack *extack, ...) {
...
-nlmsg_parse(A, B, C, D, E, NULL)
+nlmsg_parse(A, B, C, D, E, extack)
...
}

@@
expression A, B, C, D;
identifier fn, extack;
@@
fn(..., struct netlink_ext_ack *extack, ...) {
<...
-nla_parse_nested(A, B, C, D, NULL)
+nla_parse_nested(A, B, C, D, extack)
...>
}

@@
expression A, B, C, D;
identifier fn, extack;
@@
fn(..., struct netlink_ext_ack *extack, ...) {
<...
-nlmsg_validate(A, B, C, D, NULL)
+nlmsg_validate(A, B, C, D, extack)
...>
}

@@
expression A, B, C, D;
identifier fn, extack;
@@
fn(..., struct netlink_ext_ack *extack, ...) {
<...
-nla_validate(A, B, C, D, NULL)
+nla_validate(A, B, C, D, extack)
...>
}

@@
expression A, B, C;
identifier fn, extack;
@@
fn(..., struct netlink_ext_ack *extack, ...) {
<...
-nla_validate_nested(A, B, C, NULL)
+nla_validate_nested(A, B, C, extack)
...>
}

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 crypto/crypto_user.c           |  2 +-
 drivers/net/team/team.c        |  3 ++-
 net/ieee802154/nl802154.c      | 10 +++++-----
 net/netfilter/ipvs/ip_vs_ctl.c |  2 +-
 net/netfilter/nfnetlink.c      |  2 +-
 net/netlink/genetlink.c        |  2 +-
 net/nfc/netlink.c              |  2 +-
 net/tipc/bearer.c              | 14 +++++++-------
 net/tipc/net.c                 |  2 +-
 net/tipc/node.c                |  8 ++++----
 net/wireless/nl80211.c         | 33 ++++++++++++++++++---------------
 net/xfrm/xfrm_user.c           |  2 +-
 12 files changed, 43 insertions(+), 39 deletions(-)

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index fc79906c1fe7..b5758768920b 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -523,7 +523,7 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	}
 
 	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
-			  crypto_policy, NULL);
+			  crypto_policy, extack);
 	if (err < 0)
 		return err;
 
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 86f227124ba1..65c056e2f705 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2471,7 +2471,8 @@ static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
 			goto team_put;
 		}
 		err = nla_parse_nested(opt_attrs, TEAM_ATTR_OPTION_MAX,
-				       nl_option, team_nl_option_policy, NULL);
+				       nl_option, team_nl_option_policy,
+				       info->extack);
 		if (err)
 			goto team_put;
 		if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index d6b1a1b21909..99f6c254ea77 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1564,7 +1564,7 @@ static int nl802154_add_llsec_key(struct sk_buff *skb, struct genl_info *info)
 
 	if (nla_parse_nested(attrs, NL802154_KEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_KEY],
-			     nl802154_key_policy, NULL))
+			     nl802154_key_policy, info->extack))
 		return -EINVAL;
 
 	if (!attrs[NL802154_KEY_ATTR_USAGE_FRAMES] ||
@@ -1614,7 +1614,7 @@ static int nl802154_del_llsec_key(struct sk_buff *skb, struct genl_info *info)
 
 	if (nla_parse_nested(attrs, NL802154_KEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_KEY],
-			     nl802154_key_policy, NULL))
+			     nl802154_key_policy, info->extack))
 		return -EINVAL;
 
 	if (ieee802154_llsec_parse_key_id(attrs[NL802154_KEY_ATTR_ID], &id) < 0)
@@ -1782,7 +1782,7 @@ static int nl802154_del_llsec_dev(struct sk_buff *skb, struct genl_info *info)
 
 	if (nla_parse_nested(attrs, NL802154_DEV_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_DEVICE],
-			     nl802154_dev_policy, NULL))
+			     nl802154_dev_policy, info->extack))
 		return -EINVAL;
 
 	if (!attrs[NL802154_DEV_ATTR_EXTENDED_ADDR])
@@ -1910,7 +1910,7 @@ static int nl802154_add_llsec_devkey(struct sk_buff *skb, struct genl_info *info
 	if (!info->attrs[NL802154_ATTR_SEC_DEVKEY] ||
 	    nla_parse_nested(attrs, NL802154_DEVKEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_DEVKEY],
-			     nl802154_devkey_policy, NULL) < 0)
+			     nl802154_devkey_policy, info->extack) < 0)
 		return -EINVAL;
 
 	if (!attrs[NL802154_DEVKEY_ATTR_FRAME_COUNTER] ||
@@ -1942,7 +1942,7 @@ static int nl802154_del_llsec_devkey(struct sk_buff *skb, struct genl_info *info
 
 	if (nla_parse_nested(attrs, NL802154_DEVKEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_DEVKEY],
-			     nl802154_devkey_policy, NULL))
+			     nl802154_devkey_policy, info->extack))
 		return -EINVAL;
 
 	if (!attrs[NL802154_DEVKEY_ATTR_EXTENDED_ADDR])
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index adb7ee142c5f..892da70866d6 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -3532,7 +3532,7 @@ static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
 		if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
 		    nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
 				     info->attrs[IPVS_CMD_ATTR_DAEMON],
-				     ip_vs_daemon_policy, NULL))
+				     ip_vs_daemon_policy, info->extack))
 			goto out;
 
 		if (cmd == IPVS_CMD_NEW_DAEMON)
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 792def00a07d..e42f858b91d2 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -193,7 +193,7 @@ static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 		__u8 subsys_id = NFNL_SUBSYS_ID(type);
 
 		err = nla_parse(cda, ss->cb[cb_id].attr_count, attr, attrlen,
-				ss->cb[cb_id].policy, NULL);
+				ss->cb[cb_id].policy, extack);
 		if (err < 0) {
 			rcu_read_unlock();
 			return err;
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index ff6db5e66eb5..10f8b4cff40a 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -574,7 +574,7 @@ static int genl_family_rcv_msg(const struct genl_family *family,
 
 	if (attrbuf) {
 		err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
-				  ops->policy, NULL);
+				  ops->policy, extack);
 		if (err < 0)
 			goto out;
 	}
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index aca903c12671..529443acd3bc 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1162,7 +1162,7 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
 
 	nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
 		rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
-				      nfc_sdp_genl_policy, NULL);
+				      nfc_sdp_genl_policy, info->extack);
 
 		if (rc != 0) {
 			rc = -EINVAL;
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 9b5c45f48f60..d174ee3254ee 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -802,7 +802,7 @@ int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy, NULL);
+			       tipc_nl_bearer_policy, info->extack);
 	if (err)
 		return err;
 
@@ -851,7 +851,7 @@ int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy, NULL);
+			       tipc_nl_bearer_policy, info->extack);
 	if (err)
 		return err;
 
@@ -891,7 +891,7 @@ int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy, NULL);
+			       tipc_nl_bearer_policy, info->extack);
 	if (err)
 		return err;
 
@@ -939,7 +939,7 @@ int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy, NULL);
+			       tipc_nl_bearer_policy, info->extack);
 	if (err)
 		return err;
 
@@ -982,7 +982,7 @@ int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
 			       info->attrs[TIPC_NLA_BEARER],
-			       tipc_nl_bearer_policy, NULL);
+			       tipc_nl_bearer_policy, info->extack);
 	if (err)
 		return err;
 
@@ -1104,7 +1104,7 @@ int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 			       info->attrs[TIPC_NLA_MEDIA],
-			       tipc_nl_media_policy, NULL);
+			       tipc_nl_media_policy, info->extack);
 	if (err)
 		return err;
 
@@ -1152,7 +1152,7 @@ int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
 			       info->attrs[TIPC_NLA_MEDIA],
-			       tipc_nl_media_policy, NULL);
+			       tipc_nl_media_policy, info->extack);
 
 	if (!attrs[TIPC_NLA_MEDIA_NAME])
 		return -EINVAL;
diff --git a/net/tipc/net.c b/net/tipc/net.c
index 836da66cd852..719c5924b638 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -212,7 +212,7 @@ int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
 			       info->attrs[TIPC_NLA_NET], tipc_nl_net_policy,
-			       NULL);
+			       info->extack);
 	if (err)
 		return err;
 
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 1dcde24c7053..01b1f077603e 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -1608,7 +1608,7 @@ int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
 			       info->attrs[TIPC_NLA_NET], tipc_nl_net_policy,
-			       NULL);
+			       info->extack);
 	if (err)
 		return err;
 
@@ -1774,7 +1774,7 @@ int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
 			       info->attrs[TIPC_NLA_LINK],
-			       tipc_nl_link_policy, NULL);
+			       tipc_nl_link_policy, info->extack);
 	if (err)
 		return err;
 
@@ -1902,7 +1902,7 @@ int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
 			       info->attrs[TIPC_NLA_LINK],
-			       tipc_nl_link_policy, NULL);
+			       tipc_nl_link_policy, info->extack);
 	if (err)
 		return err;
 
@@ -2042,7 +2042,7 @@ int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX,
 			       info->attrs[TIPC_NLA_MON],
-			       tipc_nl_monitor_policy, NULL);
+			       tipc_nl_monitor_policy, info->extack);
 	if (err)
 		return err;
 
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index e7594a3a0ab6..f280357552b2 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -810,7 +810,8 @@ static int nl80211_parse_key_old(struct genl_info *info, struct key_parse *k)
 		int err = nla_parse_nested(kdt,
 					   NUM_NL80211_KEY_DEFAULT_TYPES - 1,
 					   info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES],
-					   nl80211_key_default_policy, NULL);
+					   nl80211_key_default_policy,
+					   info->extack);
 		if (err)
 			return err;
 
@@ -2308,7 +2309,8 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 				    rem_txq_params) {
 			result = nla_parse_nested(tb, NL80211_TXQ_ATTR_MAX,
 						  nl_txq_params,
-						  txq_params_policy, NULL);
+						  txq_params_policy,
+						  info->extack);
 			if (result)
 				return result;
 			result = parse_txq_params(tb, &txq_params);
@@ -3561,7 +3563,7 @@ static int nl80211_parse_tx_bitrate_mask(struct genl_info *info,
 		if (sband == NULL)
 			return -EINVAL;
 		err = nla_parse_nested(tb, NL80211_TXRATE_MAX, tx_rates,
-				       nl80211_txattr_policy, NULL);
+				       nl80211_txattr_policy, info->extack);
 		if (err)
 			return err;
 		if (tb[NL80211_TXRATE_LEGACY]) {
@@ -4101,7 +4103,7 @@ static int parse_station_flags(struct genl_info *info,
 		return 0;
 
 	if (nla_parse_nested(flags, NL80211_STA_FLAG_MAX, nla,
-			     sta_flags_policy, NULL))
+			     sta_flags_policy, info->extack))
 		return -EINVAL;
 
 	/*
@@ -4728,7 +4730,7 @@ static int nl80211_parse_sta_wme(struct genl_info *info,
 
 	nla = info->attrs[NL80211_ATTR_STA_WME];
 	err = nla_parse_nested(tb, NL80211_STA_WME_MAX, nla,
-			       nl80211_sta_wme_policy, NULL);
+			       nl80211_sta_wme_policy, info->extack);
 	if (err)
 		return err;
 
@@ -5853,7 +5855,7 @@ do {									    \
 		return -EINVAL;
 	if (nla_parse_nested(tb, NL80211_MESHCONF_ATTR_MAX,
 			     info->attrs[NL80211_ATTR_MESH_CONFIG],
-			     nl80211_meshconf_params_policy, NULL))
+			     nl80211_meshconf_params_policy, info->extack))
 		return -EINVAL;
 
 	/* This makes sure that there aren't more than 32 mesh config
@@ -6002,7 +6004,7 @@ static int nl80211_parse_mesh_setup(struct genl_info *info,
 		return -EINVAL;
 	if (nla_parse_nested(tb, NL80211_MESH_SETUP_ATTR_MAX,
 			     info->attrs[NL80211_ATTR_MESH_SETUP],
-			     nl80211_mesh_setup_params_policy, NULL))
+			     nl80211_mesh_setup_params_policy, info->extack))
 		return -EINVAL;
 
 	if (tb[NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC])
@@ -6393,7 +6395,8 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
 			    rem_reg_rules) {
 		r = nla_parse_nested(tb, NL80211_REG_RULE_ATTR_MAX,
-				     nl_reg_rule, reg_rule_policy, NULL);
+				     nl_reg_rule, reg_rule_policy,
+				     info->extack);
 		if (r)
 			goto bad_reg;
 		r = parse_reg_rule(tb, &rd->reg_rules[rule_idx]);
@@ -7435,7 +7438,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(csa_attrs, NL80211_ATTR_MAX,
 			       info->attrs[NL80211_ATTR_CSA_IES],
-			       nl80211_policy, NULL);
+			       nl80211_policy, info->extack);
 	if (err)
 		return err;
 
@@ -9533,7 +9536,7 @@ static int nl80211_set_cqm(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 
 	err = nla_parse_nested(attrs, NL80211_ATTR_CQM_MAX, cqm,
-			       nl80211_attr_cqm_policy, NULL);
+			       nl80211_attr_cqm_policy, info->extack);
 	if (err)
 		return err;
 
@@ -10126,7 +10129,7 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(tb, MAX_NL80211_WOWLAN_TRIG,
 			       info->attrs[NL80211_ATTR_WOWLAN_TRIGGERS],
-			       nl80211_wowlan_policy, NULL);
+			       nl80211_wowlan_policy, info->extack);
 	if (err)
 		return err;
 
@@ -10209,7 +10212,7 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
 			u8 *mask_pat;
 
 			nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat,
-					 NULL, NULL);
+					 NULL, info->extack);
 			err = -EINVAL;
 			if (!pat_tb[NL80211_PKTPAT_MASK] ||
 			    !pat_tb[NL80211_PKTPAT_PATTERN])
@@ -10579,7 +10582,7 @@ static int nl80211_set_rekey_data(struct sk_buff *skb, struct genl_info *info)
 
 	err = nla_parse_nested(tb, MAX_NL80211_REKEY_DATA,
 			       info->attrs[NL80211_ATTR_REKEY_DATA],
-			       nl80211_rekey_policy, NULL);
+			       nl80211_rekey_policy, info->extack);
 	if (err)
 		return err;
 
@@ -10896,7 +10899,7 @@ static int nl80211_nan_add_func(struct sk_buff *skb,
 
 	err = nla_parse_nested(tb, NL80211_NAN_FUNC_ATTR_MAX,
 			       info->attrs[NL80211_ATTR_NAN_FUNC],
-			       nl80211_nan_func_policy, NULL);
+			       nl80211_nan_func_policy, info->extack);
 	if (err)
 		return err;
 
@@ -10993,7 +10996,7 @@ static int nl80211_nan_add_func(struct sk_buff *skb,
 
 		err = nla_parse_nested(srf_tb, NL80211_NAN_SRF_ATTR_MAX,
 				       tb[NL80211_NAN_FUNC_SRF],
-				       nl80211_nan_srf_policy, NULL);
+				       nl80211_nan_srf_policy, info->extack);
 		if (err)
 			goto out;
 
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 0db72dd82c7e..b4c278af7ed5 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2489,7 +2489,7 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
 			  link->nla_max ? : XFRMA_MAX,
-			  link->nla_pol ? : xfrma_policy, NULL);
+			  link->nla_pol ? : xfrma_policy, extack);
 	if (err < 0)
 		return err;
 
-- 
2.11.0

Re: [PATCH v3 0/5] netlink extended ACK reporting

[Johannes Berg]

I thought a little bit more about the part of reporting the broken and
missing attributes, and I'm not sure I'm entirely happy with that part.

For reporting broken attributes, I think the pointer is really the best
thing we can do - adding the attribute number in addition to that would
seem to be easy to misuse in userspace, and there's no information
about nesting at that point and the "malformed attribute" ID will not
make any sense without knowing the nesting level. So I think we
shouldn't add the attribute ID there. The userspace app can disentangle
the nesting, or it can know that it never used nesting, for example.

Similarly, the "missing attribute" ID - which I did add an attribute
for but didn't use it yet - can result in similar interpretation
problems. I'm not really sure what to do with this one - technically
one could report back the entire nesting chain, but having that kind of
state might be really difficult.

Did anyone already have any plans for the "missing attribute"
functionality?


And another thought regarding the strict checking: we might also want
to extend that to strictly check the *size* of attributes as well. For
example, right now, if the kernel wants a u8 attribute but userspace
uses a u16 or u32, this will work on little-endian and be accepted but
wrongly be 0 on big endian.

johannes

Re: [PATCH v3 0/5] netlink extended ACK reporting

[Johannes Berg]

Here's a simple iw patch that shows the error message string:

--- a/iw.c
+++ b/iw.c
@@ -62,6 +62,10 @@ static int nl80211_init(struct nl80211_state *state)
 
 	nl_socket_set_buffer_size(state->nl_sock, 8192, 8192);
 
+	/* try to set NETLINK_EXT_ACK to 1 (ignore errors) */
+	err = 1;
+	setsockopt(nl_socket_get_fd(state->nl_sock), SOL_NETLINK, 11, &err, sizeof(err));
+
 	state->nl80211_id = genl_ctrl_resolve(state->nl_sock, "nl80211");
 	if (state->nl80211_id < 0) {
 		fprintf(stderr, "nl80211 not found.\n");
@@ -270,11 +274,45 @@ static int phy_lookup(char *name)
 	return atoi(buf);
 }
 
+#ifndef NETLINK_EXT_ACK
+enum nlmsgerr_attrs {
+	NLMSGERR_ATTR_UNUSED,
+	NLMSGERR_ATTR_MSG,
+	NLMSGERR_ATTR_OFFS,
+	NLMSGERR_ATTR_ATTR,
+	NLMSGERR_ATTR_COOKIE,
+
+	NUM_NLMSGERR_ATTRS,
+	NLMSGERR_ATTR_MAX = NUM_NLMSGERR_ATTRS - 1
+};
+#endif
+
 static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err,
 			 void *arg)
 {
+	struct nlmsghdr *nlh = (struct nlmsghdr *)err - 1;
+	int len = nlh->nlmsg_len;
+	struct nlattr *attrs;
+	struct nlattr *tb[NUM_NLMSGERR_ATTRS];
 	int *ret = arg;
+	int ack_len = sizeof(*nlh) + sizeof(int) + err->msg.nlmsg_len;
+
 	*ret = err->error;
+
+	if (len <= ack_len)
+		return NL_STOP;
+
+	attrs = (void *)((unsigned char *)nlh + ack_len);
+	len -= ack_len;
+
+	nla_parse(tb, NLMSGERR_ATTR_MAX, attrs, len, NULL);
+	if (tb[NLMSGERR_ATTR_MSG]) {
+		len = strnlen((char *)nla_data(tb[NLMSGERR_ATTR_MSG]),
+			      nla_len(tb[NLMSGERR_ATTR_MSG]));
+		fprintf(stderr, "kernel reports: %*s\n", len,
+			(char *)nla_data(tb[NLMSGERR_ATTR_MSG]));
+	}
+
 	return NL_STOP;
 }
 

johannes