Merge branch 'ethtool-allow-dumping-policies-to-user-space'

Jakub Kicinski says:

====================
ethtool: allow dumping policies to user space

This series wires up ethtool policies to ops, so they can be
dumped to user space for feature discovery.

First patch wires up GET commands, and second patch wires up SETs.

The policy tables are trimmed to save space and LoC.

Next - take care of linking up nested policies for the header
(which is the policy what we actually care about). And once header
policy is linked make sure that attribute range validation for flags
is done by policy, not a conditions in the code. New type of policy
is needed to validate masks (patch 6).

Netlink as always staying a step ahead of all the other kernel
API interfaces :)

v2:
 - merge patches 1 & 2 -> 1
 - add patch 3 & 5
 - remove .max_attr from struct ethnl_request_ops
====================
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/netlink.h

@@ -200,6 +200,7 @@ enum nla_policy_validation {
 	NLA_VALIDATE_RANGE_WARN_TOO_LONG,
 	NLA_VALIDATE_MIN,
 	NLA_VALIDATE_MAX,
+	NLA_VALIDATE_MASK,
 	NLA_VALIDATE_RANGE_PTR,
 	NLA_VALIDATE_FUNCTION,
 };
@@ -317,6 +318,7 @@ struct nla_policy {
 	u16		len;
 	union {
 		const u32 bitfield32_valid;
+		const u32 mask;
 		const char *reject_message;
 		const struct nla_policy *nested_policy;
 		struct netlink_range_validation *range;
@@ -362,20 +364,23 @@ struct nla_policy {
 #define NLA_POLICY_BITFIELD32(valid) \
 	{ .type = NLA_BITFIELD32, .bitfield32_valid = valid }
 
+#define __NLA_IS_UINT_TYPE(tp)						\
+	(tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || tp == NLA_U64)
+#define __NLA_IS_SINT_TYPE(tp)						\
+	(tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64)
+
 #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
+#define NLA_ENSURE_UINT_TYPE(tp)			\
+	(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp)) + tp)
 #define NLA_ENSURE_UINT_OR_BINARY_TYPE(tp)		\
-	(__NLA_ENSURE(tp == NLA_U8 || tp == NLA_U16 ||	\
-		      tp == NLA_U32 || tp == NLA_U64 ||	\
+	(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) ||	\
 		      tp == NLA_MSECS ||		\
 		      tp == NLA_BINARY) + tp)
 #define NLA_ENSURE_SINT_TYPE(tp)			\
-	(__NLA_ENSURE(tp == NLA_S8 || tp == NLA_S16  ||	\
-		      tp == NLA_S32 || tp == NLA_S64) + tp)
+	(__NLA_ENSURE(__NLA_IS_SINT_TYPE(tp)) + tp)
 #define NLA_ENSURE_INT_OR_BINARY_TYPE(tp)		\
-	(__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 ||	\
-		      tp == NLA_S16 || tp == NLA_U16 ||	\
-		      tp == NLA_S32 || tp == NLA_U32 ||	\
-		      tp == NLA_S64 || tp == NLA_U64 ||	\
+	(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) ||		\
+		      __NLA_IS_SINT_TYPE(tp) ||		\
 		      tp == NLA_MSECS ||		\
 		      tp == NLA_BINARY) + tp)
 #define NLA_ENSURE_NO_VALIDATION_PTR(tp)		\
@@ -415,6 +420,12 @@ struct nla_policy {
 	.max = _max,					\
 }
 
+#define NLA_POLICY_MASK(tp, _mask) {			\
+	.type = NLA_ENSURE_UINT_TYPE(tp),		\
+	.validation_type = NLA_VALIDATE_MASK,		\
+	.mask = _mask,					\
+}
+
 #define NLA_POLICY_VALIDATE_FN(tp, fn, ...) {		\
 	.type = NLA_ENSURE_NO_VALIDATION_PTR(tp),	\
 	.validation_type = NLA_VALIDATE_FUNCTION,	\

include/uapi/linux/netlink.h

@@ -331,6 +331,7 @@ enum netlink_attribute_type {
  *	the index, if limited inside the nesting (U32)
  * @NL_POLICY_TYPE_ATTR_BITFIELD32_MASK: valid mask for the
  *	bitfield32 type (U32)
+ * @NL_POLICY_TYPE_ATTR_MASK: mask of valid bits for unsigned integers (U64)
  * @NL_POLICY_TYPE_ATTR_PAD: pad attribute for 64-bit alignment
  */
 enum netlink_policy_type_attr {
@@ -346,6 +347,7 @@ enum netlink_policy_type_attr {
 	NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE,
 	NL_POLICY_TYPE_ATTR_BITFIELD32_MASK,
 	NL_POLICY_TYPE_ATTR_PAD,
+	NL_POLICY_TYPE_ATTR_MASK,
 
 	/* keep last */
 	__NL_POLICY_TYPE_ATTR_MAX,

lib/nlattr.c

@@ -323,6 +323,37 @@ static int nla_validate_int_range(const struct nla_policy *pt,
 	}
 }
 
+static int nla_validate_mask(const struct nla_policy *pt,
+			     const struct nlattr *nla,
+			     struct netlink_ext_ack *extack)
+{
+	u64 value;
+
+	switch (pt->type) {
+	case NLA_U8:
+		value = nla_get_u8(nla);
+		break;
+	case NLA_U16:
+		value = nla_get_u16(nla);
+		break;
+	case NLA_U32:
+		value = nla_get_u32(nla);
+		break;
+	case NLA_U64:
+		value = nla_get_u64(nla);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (value & ~(u64)pt->mask) {
+		NL_SET_ERR_MSG_ATTR(extack, nla, "reserved bit set");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int validate_nla(const struct nlattr *nla, int maxtype,
 			const struct nla_policy *policy, unsigned int validate,
 			struct netlink_ext_ack *extack, unsigned int depth)
@@ -503,6 +534,11 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
 		if (err)
 			return err;
 		break;
+	case NLA_VALIDATE_MASK:
+		err = nla_validate_mask(pt, nla, extack);
+		if (err)
+			return err;
+		break;
 	case NLA_VALIDATE_FUNCTION:
 		if (pt->validate) {
 			err = pt->validate(nla, extack);

net/ethtool/bitset.c

@@ -302,8 +302,7 @@ int ethnl_put_bitset32(struct sk_buff *skb, int attrtype, const u32 *val,
 	return -EMSGSIZE;
 }
 
-static const struct nla_policy bitset_policy[ETHTOOL_A_BITSET_MAX + 1] = {
-	[ETHTOOL_A_BITSET_UNSPEC]	= { .type = NLA_REJECT },
+static const struct nla_policy bitset_policy[] = {
 	[ETHTOOL_A_BITSET_NOMASK]	= { .type = NLA_FLAG },
 	[ETHTOOL_A_BITSET_SIZE]		= NLA_POLICY_MAX(NLA_U32,
 							 ETHNL_MAX_BITSET_SIZE),
@@ -312,8 +311,7 @@ static const struct nla_policy bitset_policy[ETHTOOL_A_BITSET_MAX + 1] = {
 	[ETHTOOL_A_BITSET_MASK]		= { .type = NLA_BINARY },
 };
 
-static const struct nla_policy bit_policy[ETHTOOL_A_BITSET_BIT_MAX + 1] = {
-	[ETHTOOL_A_BITSET_BIT_UNSPEC]	= { .type = NLA_REJECT },
+static const struct nla_policy bit_policy[] = {
 	[ETHTOOL_A_BITSET_BIT_INDEX]	= { .type = NLA_U32 },
 	[ETHTOOL_A_BITSET_BIT_NAME]	= { .type = NLA_NUL_STRING },
 	[ETHTOOL_A_BITSET_BIT_VALUE]	= { .type = NLA_FLAG },
@@ -329,10 +327,10 @@ static const struct nla_policy bit_policy[ETHTOOL_A_BITSET_BIT_MAX + 1] = {
  */
 int ethnl_bitset_is_compact(const struct nlattr *bitset, bool *compact)
 {
-	struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
+	struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
 	int ret;
 
-	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, bitset,
+	ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, bitset,
 			       bitset_policy, NULL);
 	if (ret < 0)
 		return ret;
@@ -381,10 +379,10 @@ static int ethnl_parse_bit(unsigned int *index, bool *val, unsigned int nbits,
 			   ethnl_string_array_t names,
 			   struct netlink_ext_ack *extack)
 {
-	struct nlattr *tb[ETHTOOL_A_BITSET_BIT_MAX + 1];
+	struct nlattr *tb[ARRAY_SIZE(bit_policy)];
 	int ret, idx;
 
-	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_BIT_MAX, bit_attr,
+	ret = nla_parse_nested(tb, ARRAY_SIZE(bit_policy) - 1, bit_attr,
 			       bit_policy, extack);
 	if (ret < 0)
 		return ret;
@@ -555,15 +553,15 @@ int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
 			  const struct nlattr *attr, ethnl_string_array_t names,
 			  struct netlink_ext_ack *extack, bool *mod)
 {
-	struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
+	struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
 	unsigned int change_bits;
 	bool no_mask;
 	int ret;
 
 	if (!attr)
 		return 0;
-	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, attr, bitset_policy,
-			       extack);
+	ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, attr,
+			       bitset_policy, extack);
 	if (ret < 0)
 		return ret;
 
@@ -608,7 +606,7 @@ int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
 		       ethnl_string_array_t names,
 		       struct netlink_ext_ack *extack)
 {
-	struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
+	struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
 	const struct nlattr *bit_attr;
 	bool no_mask;
 	int rem;
@@ -616,8 +614,8 @@ int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
 
 	if (!attr)
 		return 0;
-	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, attr, bitset_policy,
-			       extack);
+	ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, attr,
+			       bitset_policy, extack);
 	if (ret < 0)
 		return ret;
 	no_mask = tb[ETHTOOL_A_BITSET_NOMASK];

net/ethtool/cabletest.c

@@ -11,10 +11,9 @@
  */
 #define MAX_CABLE_LENGTH_CM (150 * 100)
 
-static const struct nla_policy
-cable_test_act_policy[ETHTOOL_A_CABLE_TEST_MAX + 1] = {
-	[ETHTOOL_A_CABLE_TEST_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CABLE_TEST_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_cable_test_act_policy[] = {
+	[ETHTOOL_A_CABLE_TEST_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int ethnl_cable_test_started(struct phy_device *phydev, u8 cmd)
@@ -56,18 +55,12 @@ static int ethnl_cable_test_started(struct phy_device *phydev, u8 cmd)
 
 int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_CABLE_TEST_MAX + 1];
 	struct ethnl_req_info req_info = {};
 	const struct ethtool_phy_ops *ops;
+	struct nlattr **tb = info->attrs;
 	struct net_device *dev;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_CABLE_TEST_MAX,
-			  cable_test_act_policy, info->extack);
-	if (ret < 0)
-		return ret;
-
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_CABLE_TEST_HEADER],
 					 genl_info_net(info), info->extack,
@@ -218,18 +211,16 @@ struct cable_test_tdr_req_info {
 	struct ethnl_req_info		base;
 };
 
-static const struct nla_policy
-cable_test_tdr_act_cfg_policy[ETHTOOL_A_CABLE_TEST_TDR_CFG_MAX + 1] = {
+static const struct nla_policy cable_test_tdr_act_cfg_policy[] = {
 	[ETHTOOL_A_CABLE_TEST_TDR_CFG_FIRST]	= { .type = NLA_U32 },
 	[ETHTOOL_A_CABLE_TEST_TDR_CFG_LAST]	= { .type = NLA_U32 },
 	[ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP]	= { .type = NLA_U32 },
 	[ETHTOOL_A_CABLE_TEST_TDR_CFG_PAIR]	= { .type = NLA_U8 },
 };
 
-static const struct nla_policy
-cable_test_tdr_act_policy[ETHTOOL_A_CABLE_TEST_TDR_MAX + 1] = {
-	[ETHTOOL_A_CABLE_TEST_TDR_UNSPEC]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_CABLE_TEST_TDR_HEADER]	= { .type = NLA_NESTED },
+const struct nla_policy ethnl_cable_test_tdr_act_policy[] = {
+	[ETHTOOL_A_CABLE_TEST_TDR_HEADER]	=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_CABLE_TEST_TDR_CFG]		= { .type = NLA_NESTED },
 };
 
@@ -238,7 +229,7 @@ static int ethnl_act_cable_test_tdr_cfg(const struct nlattr *nest,
 					struct genl_info *info,
 					struct phy_tdr_config *cfg)
 {
-	struct nlattr *tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_MAX + 1];
+	struct nlattr *tb[ARRAY_SIZE(cable_test_tdr_act_cfg_policy)];
 	int ret;
 
 	cfg->first = 100;
@@ -249,8 +240,10 @@ static int ethnl_act_cable_test_tdr_cfg(const struct nlattr *nest,
 	if (!nest)
 		return 0;
 
-	ret = nla_parse_nested(tb, ETHTOOL_A_CABLE_TEST_TDR_CFG_MAX, nest,
-			       cable_test_tdr_act_cfg_policy, info->extack);
+	ret = nla_parse_nested(tb,
+			       ARRAY_SIZE(cable_test_tdr_act_cfg_policy) - 1,
+			       nest, cable_test_tdr_act_cfg_policy,
+			       info->extack);
 	if (ret < 0)
 		return ret;
 
@@ -313,19 +306,13 @@ static int ethnl_act_cable_test_tdr_cfg(const struct nlattr *nest,
 
 int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_CABLE_TEST_TDR_MAX + 1];
 	struct ethnl_req_info req_info = {};
 	const struct ethtool_phy_ops *ops;
+	struct nlattr **tb = info->attrs;
 	struct phy_tdr_config cfg;
 	struct net_device *dev;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_CABLE_TEST_TDR_MAX,
-			  cable_test_tdr_act_policy, info->extack);
-	if (ret < 0)
-		return ret;
-
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_CABLE_TEST_TDR_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/channels.c

@@ -17,18 +17,9 @@ struct channels_reply_data {
 #define CHANNELS_REPDATA(__reply_base) \
 	container_of(__reply_base, struct channels_reply_data, base)
 
-static const struct nla_policy
-channels_get_policy[ETHTOOL_A_CHANNELS_MAX + 1] = {
-	[ETHTOOL_A_CHANNELS_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_CHANNELS_RX_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_TX_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_OTHER_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_COMBINED_MAX]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_RX_COUNT]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_TX_COUNT]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_OTHER_COUNT]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_COMBINED_COUNT]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_channels_get_policy[] = {
+	[ETHTOOL_A_CHANNELS_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int channels_prepare_data(const struct ethnl_req_info *req_base,
@@ -99,10 +90,8 @@ const struct ethnl_request_ops ethnl_channels_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_CHANNELS_GET,
 	.reply_cmd		= ETHTOOL_MSG_CHANNELS_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_CHANNELS_HEADER,
-	.max_attr		= ETHTOOL_A_CHANNELS_MAX,
 	.req_info_size		= sizeof(struct channels_req_info),
 	.reply_data_size	= sizeof(struct channels_reply_data),
-	.request_policy		= channels_get_policy,
 
 	.prepare_data		= channels_prepare_data,
 	.reply_size		= channels_reply_size,
@@ -111,14 +100,9 @@ const struct ethnl_request_ops ethnl_channels_request_ops = {
 
 /* CHANNELS_SET */
 
-static const struct nla_policy
-channels_set_policy[ETHTOOL_A_CHANNELS_MAX + 1] = {
-	[ETHTOOL_A_CHANNELS_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_CHANNELS_RX_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_TX_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_OTHER_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_CHANNELS_COMBINED_MAX]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_channels_set_policy[] = {
+	[ETHTOOL_A_CHANNELS_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_CHANNELS_RX_COUNT]		= { .type = NLA_U32 },
 	[ETHTOOL_A_CHANNELS_TX_COUNT]		= { .type = NLA_U32 },
 	[ETHTOOL_A_CHANNELS_OTHER_COUNT]	= { .type = NLA_U32 },
@@ -127,22 +111,17 @@ channels_set_policy[ETHTOOL_A_CHANNELS_MAX + 1] = {
 
 int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_CHANNELS_MAX + 1];
 	unsigned int from_channel, old_total, i;
 	bool mod = false, mod_combined = false;
 	struct ethtool_channels channels = {};
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	const struct nlattr *err_attr;
 	const struct ethtool_ops *ops;
 	struct net_device *dev;
 	u32 max_rx_in_use = 0;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_CHANNELS_MAX, channels_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_CHANNELS_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/coalesce.c

@@ -51,32 +51,9 @@ __CHECK_SUPPORTED_OFFSET(COALESCE_TX_USECS_HIGH);
 __CHECK_SUPPORTED_OFFSET(COALESCE_TX_MAX_FRAMES_HIGH);
 __CHECK_SUPPORTED_OFFSET(COALESCE_RATE_SAMPLE_INTERVAL);
 
-static const struct nla_policy
-coalesce_get_policy[ETHTOOL_A_COALESCE_MAX + 1] = {
-	[ETHTOOL_A_COALESCE_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_COALESCE_RX_USECS]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RX_MAX_FRAMES]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RX_USECS_IRQ]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RX_MAX_FRAMES_IRQ]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_USECS]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_MAX_FRAMES]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_USECS_IRQ]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_MAX_FRAMES_IRQ]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_STATS_BLOCK_USECS]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_USE_ADAPTIVE_RX]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_USE_ADAPTIVE_TX]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_PKT_RATE_LOW]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RX_USECS_LOW]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RX_MAX_FRAMES_LOW]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_USECS_LOW]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_MAX_FRAMES_LOW]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_PKT_RATE_HIGH]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RX_USECS_HIGH]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RX_MAX_FRAMES_HIGH]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_USECS_HIGH]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL] = { .type = NLA_REJECT },
+const struct nla_policy ethnl_coalesce_get_policy[] = {
+	[ETHTOOL_A_COALESCE_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int coalesce_prepare_data(const struct ethnl_req_info *req_base,
@@ -203,10 +180,8 @@ const struct ethnl_request_ops ethnl_coalesce_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_COALESCE_GET,
 	.reply_cmd		= ETHTOOL_MSG_COALESCE_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_COALESCE_HEADER,
-	.max_attr		= ETHTOOL_A_COALESCE_MAX,
 	.req_info_size		= sizeof(struct coalesce_req_info),
 	.reply_data_size	= sizeof(struct coalesce_reply_data),
-	.request_policy		= coalesce_get_policy,
 
 	.prepare_data		= coalesce_prepare_data,
 	.reply_size		= coalesce_reply_size,
@@ -215,10 +190,9 @@ const struct ethnl_request_ops ethnl_coalesce_request_ops = {
 
 /* COALESCE_SET */
 
-static const struct nla_policy
-coalesce_set_policy[ETHTOOL_A_COALESCE_MAX + 1] = {
-	[ETHTOOL_A_COALESCE_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_COALESCE_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_coalesce_set_policy[] = {
+	[ETHTOOL_A_COALESCE_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_COALESCE_RX_USECS]		= { .type = NLA_U32 },
 	[ETHTOOL_A_COALESCE_RX_MAX_FRAMES]	= { .type = NLA_U32 },
 	[ETHTOOL_A_COALESCE_RX_USECS_IRQ]	= { .type = NLA_U32 },
@@ -245,9 +219,9 @@ coalesce_set_policy[ETHTOOL_A_COALESCE_MAX + 1] = {
 
 int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_COALESCE_MAX + 1];
 	struct ethtool_coalesce coalesce = {};
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	const struct ethtool_ops *ops;
 	struct net_device *dev;
 	u32 supported_params;
@@ -255,11 +229,6 @@ int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info)
 	int ret;
 	u16 a;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_COALESCE_MAX, coalesce_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_COALESCE_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/debug.c

@@ -16,11 +16,9 @@ struct debug_reply_data {
 #define DEBUG_REPDATA(__reply_base) \
 	container_of(__reply_base, struct debug_reply_data, base)
 
-static const struct nla_policy
-debug_get_policy[ETHTOOL_A_DEBUG_MAX + 1] = {
-	[ETHTOOL_A_DEBUG_UNSPEC]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_DEBUG_HEADER]	= { .type = NLA_NESTED },
-	[ETHTOOL_A_DEBUG_MSGMASK]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_debug_get_policy[] = {
+	[ETHTOOL_A_DEBUG_HEADER]	=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int debug_prepare_data(const struct ethnl_req_info *req_base,
@@ -69,10 +67,8 @@ const struct ethnl_request_ops ethnl_debug_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_DEBUG_GET,
 	.reply_cmd		= ETHTOOL_MSG_DEBUG_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_DEBUG_HEADER,
-	.max_attr		= ETHTOOL_A_DEBUG_MAX,
 	.req_info_size		= sizeof(struct debug_req_info),
 	.reply_data_size	= sizeof(struct debug_reply_data),
-	.request_policy		= debug_get_policy,
 
 	.prepare_data		= debug_prepare_data,
 	.reply_size		= debug_reply_size,
@@ -81,27 +77,21 @@ const struct ethnl_request_ops ethnl_debug_request_ops = {
 
 /* DEBUG_SET */
 
-static const struct nla_policy
-debug_set_policy[ETHTOOL_A_DEBUG_MAX + 1] = {
-	[ETHTOOL_A_DEBUG_UNSPEC]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_DEBUG_HEADER]	= { .type = NLA_NESTED },
+const struct nla_policy ethnl_debug_set_policy[] = {
+	[ETHTOOL_A_DEBUG_HEADER]	=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_DEBUG_MSGMASK]	= { .type = NLA_NESTED },
 };
 
 int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_DEBUG_MAX + 1];
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	struct net_device *dev;
 	bool mod = false;
 	u32 msg_mask;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_DEBUG_MAX, debug_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_DEBUG_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/eee.c

@@ -19,16 +19,9 @@ struct eee_reply_data {
 #define EEE_REPDATA(__reply_base) \
 	container_of(__reply_base, struct eee_reply_data, base)
 
-static const struct nla_policy
-eee_get_policy[ETHTOOL_A_EEE_MAX + 1] = {
-	[ETHTOOL_A_EEE_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_EEE_MODES_OURS]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_MODES_PEER]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_ACTIVE]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_ENABLED]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_TX_LPI_ENABLED]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_TX_LPI_TIMER]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_eee_get_policy[] = {
+	[ETHTOOL_A_EEE_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int eee_prepare_data(const struct ethnl_req_info *req_base,
@@ -119,10 +112,8 @@ const struct ethnl_request_ops ethnl_eee_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_EEE_GET,
 	.reply_cmd		= ETHTOOL_MSG_EEE_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_EEE_HEADER,
-	.max_attr		= ETHTOOL_A_EEE_MAX,
 	.req_info_size		= sizeof(struct eee_req_info),
 	.reply_data_size	= sizeof(struct eee_reply_data),
-	.request_policy		= eee_get_policy,
 
 	.prepare_data		= eee_prepare_data,
 	.reply_size		= eee_reply_size,
@@ -131,13 +122,10 @@ const struct ethnl_request_ops ethnl_eee_request_ops = {
 
 /* EEE_SET */
 
-static const struct nla_policy
-eee_set_policy[ETHTOOL_A_EEE_MAX + 1] = {
-	[ETHTOOL_A_EEE_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_eee_set_policy[] = {
+	[ETHTOOL_A_EEE_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_EEE_MODES_OURS]	= { .type = NLA_NESTED },
-	[ETHTOOL_A_EEE_MODES_PEER]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_EEE_ACTIVE]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_EEE_ENABLED]		= { .type = NLA_U8 },
 	[ETHTOOL_A_EEE_TX_LPI_ENABLED]	= { .type = NLA_U8 },
 	[ETHTOOL_A_EEE_TX_LPI_TIMER]	= { .type = NLA_U32 },
@@ -145,18 +133,14 @@ eee_set_policy[ETHTOOL_A_EEE_MAX + 1] = {
 
 int ethnl_set_eee(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_EEE_MAX + 1];
-	struct ethtool_eee eee = {};
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	const struct ethtool_ops *ops;
+	struct ethtool_eee eee = {};
 	struct net_device *dev;
 	bool mod = false;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_EEE_MAX,
-			  eee_set_policy, info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_EEE_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/features.c

@@ -20,14 +20,9 @@ struct features_reply_data {
 #define FEATURES_REPDATA(__reply_base) \
 	container_of(__reply_base, struct features_reply_data, base)
 
-static const struct nla_policy
-features_get_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
-	[ETHTOOL_A_FEATURES_UNSPEC]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_FEATURES_HEADER]	= { .type = NLA_NESTED },
-	[ETHTOOL_A_FEATURES_HW]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_FEATURES_WANTED]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_FEATURES_ACTIVE]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_FEATURES_NOCHANGE]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_features_get_policy[] = {
+	[ETHTOOL_A_FEATURES_HEADER]	=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
@@ -120,10 +115,8 @@ const struct ethnl_request_ops ethnl_features_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_FEATURES_GET,
 	.reply_cmd		= ETHTOOL_MSG_FEATURES_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_FEATURES_HEADER,
-	.max_attr		= ETHTOOL_A_FEATURES_MAX,
 	.req_info_size		= sizeof(struct features_req_info),
 	.reply_data_size	= sizeof(struct features_reply_data),
-	.request_policy		= features_get_policy,
 
 	.prepare_data		= features_prepare_data,
 	.reply_size		= features_reply_size,
@@ -132,14 +125,10 @@ const struct ethnl_request_ops ethnl_features_request_ops = {
 
 /* FEATURES_SET */
 
-static const struct nla_policy
-features_set_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
-	[ETHTOOL_A_FEATURES_UNSPEC]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_FEATURES_HEADER]	= { .type = NLA_NESTED },
-	[ETHTOOL_A_FEATURES_HW]		= { .type = NLA_REJECT },
+const struct nla_policy ethnl_features_set_policy[] = {
+	[ETHTOOL_A_FEATURES_HEADER]	=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_FEATURES_WANTED]	= { .type = NLA_NESTED },
-	[ETHTOOL_A_FEATURES_ACTIVE]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_FEATURES_NOCHANGE]	= { .type = NLA_REJECT },
 };
 
 static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
@@ -229,17 +218,12 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
 	DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
-	struct nlattr *tb[ETHTOOL_A_FEATURES_MAX + 1];
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	struct net_device *dev;
 	bool mod;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_FEATURES_MAX, features_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	if (!tb[ETHTOOL_A_FEATURES_WANTED])
 		return -EINVAL;
 	ret = ethnl_parse_header_dev_get(&req_info,

net/ethtool/linkinfo.c

@@ -16,15 +16,9 @@ struct linkinfo_reply_data {
 #define LINKINFO_REPDATA(__reply_base) \
 	container_of(__reply_base, struct linkinfo_reply_data, base)
 
-static const struct nla_policy
-linkinfo_get_policy[ETHTOOL_A_LINKINFO_MAX + 1] = {
-	[ETHTOOL_A_LINKINFO_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKINFO_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_LINKINFO_PORT]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKINFO_PHYADDR]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKINFO_TP_MDIX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKINFO_TRANSCEIVER]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_linkinfo_get_policy[] = {
+	[ETHTOOL_A_LINKINFO_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int linkinfo_prepare_data(const struct ethnl_req_info *req_base,
@@ -83,10 +77,8 @@ const struct ethnl_request_ops ethnl_linkinfo_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_LINKINFO_GET,
 	.reply_cmd		= ETHTOOL_MSG_LINKINFO_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_LINKINFO_HEADER,
-	.max_attr		= ETHTOOL_A_LINKINFO_MAX,
 	.req_info_size		= sizeof(struct linkinfo_req_info),
 	.reply_data_size	= sizeof(struct linkinfo_reply_data),
-	.request_policy		= linkinfo_get_policy,
 
 	.prepare_data		= linkinfo_prepare_data,
 	.reply_size		= linkinfo_reply_size,
@@ -95,32 +87,24 @@ const struct ethnl_request_ops ethnl_linkinfo_request_ops = {
 
 /* LINKINFO_SET */
 
-static const struct nla_policy
-linkinfo_set_policy[ETHTOOL_A_LINKINFO_MAX + 1] = {
-	[ETHTOOL_A_LINKINFO_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKINFO_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_linkinfo_set_policy[] = {
+	[ETHTOOL_A_LINKINFO_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_LINKINFO_PORT]		= { .type = NLA_U8 },
 	[ETHTOOL_A_LINKINFO_PHYADDR]		= { .type = NLA_U8 },
-	[ETHTOOL_A_LINKINFO_TP_MDIX]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL]	= { .type = NLA_U8 },
-	[ETHTOOL_A_LINKINFO_TRANSCEIVER]	= { .type = NLA_REJECT },
 };
 
 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_LINKINFO_MAX + 1];
 	struct ethtool_link_ksettings ksettings = {};
 	struct ethtool_link_settings *lsettings;
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	struct net_device *dev;
 	bool mod = false;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_LINKINFO_MAX, linkinfo_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_LINKINFO_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/linkmodes.c

@@ -18,17 +18,9 @@ struct linkmodes_reply_data {
 #define LINKMODES_REPDATA(__reply_base) \
 	container_of(__reply_base, struct linkmodes_reply_data, base)
 
-static const struct nla_policy
-linkmodes_get_policy[ETHTOOL_A_LINKMODES_MAX + 1] = {
-	[ETHTOOL_A_LINKMODES_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_LINKMODES_AUTONEG]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_OURS]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_PEER]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_SPEED]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_DUPLEX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_linkmodes_get_policy[] = {
+	[ETHTOOL_A_LINKMODES_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
@@ -148,10 +140,8 @@ const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_LINKMODES_GET,
 	.reply_cmd		= ETHTOOL_MSG_LINKMODES_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_LINKMODES_HEADER,
-	.max_attr		= ETHTOOL_A_LINKMODES_MAX,
 	.req_info_size		= sizeof(struct linkmodes_req_info),
 	.reply_data_size	= sizeof(struct linkmodes_reply_data),
-	.request_policy		= linkmodes_get_policy,
 
 	.prepare_data		= linkmodes_prepare_data,
 	.reply_size		= linkmodes_reply_size,
@@ -276,17 +266,14 @@ static const struct link_mode_info link_mode_params[] = {
 	__DEFINE_LINK_MODE_PARAMS(100, FX, Full),
 };
 
-static const struct nla_policy
-linkmodes_set_policy[ETHTOOL_A_LINKMODES_MAX + 1] = {
-	[ETHTOOL_A_LINKMODES_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKMODES_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_linkmodes_set_policy[] = {
+	[ETHTOOL_A_LINKMODES_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_LINKMODES_AUTONEG]		= { .type = NLA_U8 },
 	[ETHTOOL_A_LINKMODES_OURS]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_LINKMODES_PEER]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_LINKMODES_SPEED]		= { .type = NLA_U32 },
 	[ETHTOOL_A_LINKMODES_DUPLEX]		= { .type = NLA_U8 },
 	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]	= { .type = NLA_U8 },
-	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE]	= { .type = NLA_REJECT },
 };
 
 /* Set advertised link modes to all supported modes matching requested speed
@@ -392,18 +379,13 @@ static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
 
 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_LINKMODES_MAX + 1];
 	struct ethtool_link_ksettings ksettings = {};
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	struct net_device *dev;
 	bool mod = false;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_LINKMODES_MAX, linkmodes_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_LINKMODES_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/linkstate.c

@@ -20,15 +20,9 @@ struct linkstate_reply_data {
 #define LINKSTATE_REPDATA(__reply_base) \
 	container_of(__reply_base, struct linkstate_reply_data, base)
 
-static const struct nla_policy
-linkstate_get_policy[ETHTOOL_A_LINKSTATE_MAX + 1] = {
-	[ETHTOOL_A_LINKSTATE_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKSTATE_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_LINKSTATE_LINK]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKSTATE_SQI]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKSTATE_SQI_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKSTATE_EXT_STATE]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_LINKSTATE_EXT_SUBSTATE]	= { .type = NLA_REJECT },
+const struct nla_policy ethnl_linkstate_get_policy[] = {
+	[ETHTOOL_A_LINKSTATE_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int linkstate_get_sqi(struct net_device *dev)
@@ -179,10 +173,8 @@ const struct ethnl_request_ops ethnl_linkstate_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_LINKSTATE_GET,
 	.reply_cmd		= ETHTOOL_MSG_LINKSTATE_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_LINKSTATE_HEADER,
-	.max_attr		= ETHTOOL_A_LINKSTATE_MAX,
 	.req_info_size		= sizeof(struct linkstate_req_info),
 	.reply_data_size	= sizeof(struct linkstate_reply_data),
-	.request_policy		= linkstate_get_policy,
 
 	.prepare_data		= linkstate_prepare_data,
 	.reply_size		= linkstate_reply_size,

net/ethtool/netlink.h

@@ -266,10 +266,8 @@ static inline void ethnl_ops_complete(struct net_device *dev)
  * @request_cmd:      command id for request (GET)
  * @reply_cmd:        command id for reply (GET_REPLY)
  * @hdr_attr:         attribute type for request header
- * @max_attr:         maximum (top level) attribute type
  * @req_info_size:    size of request info
  * @reply_data_size:  size of reply data
- * @request_policy:   netlink policy for message contents
  * @allow_nodev_do:   allow non-dump request with no device identification
  * @parse_request:
  *	Parse request except common header (struct ethnl_req_info). Common
@@ -312,10 +310,8 @@ struct ethnl_request_ops {
 	u8			request_cmd;
 	u8			reply_cmd;
 	u16			hdr_attr;
-	unsigned int		max_attr;
 	unsigned int		req_info_size;
 	unsigned int		reply_data_size;
-	const struct nla_policy *request_policy;
 	bool			allow_nodev_do;
 
 	int (*parse_request)(struct ethnl_req_info *req_info,
@@ -349,6 +345,37 @@ extern const struct ethnl_request_ops ethnl_pause_request_ops;
 extern const struct ethnl_request_ops ethnl_eee_request_ops;
 extern const struct ethnl_request_ops ethnl_tsinfo_request_ops;
 
+extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
+extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
+extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_STRINGSETS + 1];
+extern const struct nla_policy ethnl_linkinfo_get_policy[ETHTOOL_A_LINKINFO_HEADER + 1];
+extern const struct nla_policy ethnl_linkinfo_set_policy[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL + 1];
+extern const struct nla_policy ethnl_linkmodes_get_policy[ETHTOOL_A_LINKMODES_HEADER + 1];
+extern const struct nla_policy ethnl_linkmodes_set_policy[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG + 1];
+extern const struct nla_policy ethnl_linkstate_get_policy[ETHTOOL_A_LINKSTATE_HEADER + 1];
+extern const struct nla_policy ethnl_debug_get_policy[ETHTOOL_A_DEBUG_HEADER + 1];
+extern const struct nla_policy ethnl_debug_set_policy[ETHTOOL_A_DEBUG_MSGMASK + 1];
+extern const struct nla_policy ethnl_wol_get_policy[ETHTOOL_A_WOL_HEADER + 1];
+extern const struct nla_policy ethnl_wol_set_policy[ETHTOOL_A_WOL_SOPASS + 1];
+extern const struct nla_policy ethnl_features_get_policy[ETHTOOL_A_FEATURES_HEADER + 1];
+extern const struct nla_policy ethnl_features_set_policy[ETHTOOL_A_FEATURES_WANTED + 1];
+extern const struct nla_policy ethnl_privflags_get_policy[ETHTOOL_A_PRIVFLAGS_HEADER + 1];
+extern const struct nla_policy ethnl_privflags_set_policy[ETHTOOL_A_PRIVFLAGS_FLAGS + 1];
+extern const struct nla_policy ethnl_rings_get_policy[ETHTOOL_A_RINGS_HEADER + 1];
+extern const struct nla_policy ethnl_rings_set_policy[ETHTOOL_A_RINGS_TX + 1];
+extern const struct nla_policy ethnl_channels_get_policy[ETHTOOL_A_CHANNELS_HEADER + 1];
+extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMBINED_COUNT + 1];
+extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1];
+extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL + 1];
+extern const struct nla_policy ethnl_pause_get_policy[ETHTOOL_A_PAUSE_HEADER + 1];
+extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_TX + 1];
+extern const struct nla_policy ethnl_eee_get_policy[ETHTOOL_A_EEE_HEADER + 1];
+extern const struct nla_policy ethnl_eee_set_policy[ETHTOOL_A_EEE_TX_LPI_TIMER + 1];
+extern const struct nla_policy ethnl_tsinfo_get_policy[ETHTOOL_A_TSINFO_HEADER + 1];
+extern const struct nla_policy ethnl_cable_test_act_policy[ETHTOOL_A_CABLE_TEST_HEADER + 1];
+extern const struct nla_policy ethnl_cable_test_tdr_act_policy[ETHTOOL_A_CABLE_TEST_TDR_CFG + 1];
+extern const struct nla_policy ethnl_tunnel_info_get_policy[ETHTOOL_A_TUNNEL_INFO_HEADER + 1];
+
 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
 int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info);

net/ethtool/pause.c

@@ -16,14 +16,9 @@ struct pause_reply_data {
 #define PAUSE_REPDATA(__reply_base) \
 	container_of(__reply_base, struct pause_reply_data, base)
 
-static const struct nla_policy
-pause_get_policy[ETHTOOL_A_PAUSE_MAX + 1] = {
-	[ETHTOOL_A_PAUSE_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_PAUSE_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_PAUSE_AUTONEG]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_PAUSE_RX]			= { .type = NLA_REJECT },
-	[ETHTOOL_A_PAUSE_TX]			= { .type = NLA_REJECT },
-	[ETHTOOL_A_PAUSE_STATS]			= { .type = NLA_REJECT },
+const struct nla_policy ethnl_pause_get_policy[] = {
+	[ETHTOOL_A_PAUSE_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy_stats),
 };
 
 static void ethtool_stats_init(u64 *stats, unsigned int n)
@@ -130,10 +125,8 @@ const struct ethnl_request_ops ethnl_pause_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_PAUSE_GET,
 	.reply_cmd		= ETHTOOL_MSG_PAUSE_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_PAUSE_HEADER,
-	.max_attr		= ETHTOOL_A_PAUSE_MAX,
 	.req_info_size		= sizeof(struct pause_req_info),
 	.reply_data_size	= sizeof(struct pause_reply_data),
-	.request_policy		= pause_get_policy,
 
 	.prepare_data		= pause_prepare_data,
 	.reply_size		= pause_reply_size,
@@ -142,30 +135,24 @@ const struct ethnl_request_ops ethnl_pause_request_ops = {
 
 /* PAUSE_SET */
 
-static const struct nla_policy
-pause_set_policy[ETHTOOL_A_PAUSE_MAX + 1] = {
-	[ETHTOOL_A_PAUSE_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_PAUSE_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_pause_set_policy[] = {
+	[ETHTOOL_A_PAUSE_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_PAUSE_AUTONEG]		= { .type = NLA_U8 },
 	[ETHTOOL_A_PAUSE_RX]			= { .type = NLA_U8 },
 	[ETHTOOL_A_PAUSE_TX]			= { .type = NLA_U8 },
-	[ETHTOOL_A_PAUSE_STATS]			= { .type = NLA_REJECT },
 };
 
 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_PAUSE_MAX + 1];
 	struct ethtool_pauseparam params = {};
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	const struct ethtool_ops *ops;
 	struct net_device *dev;
 	bool mod = false;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_PAUSE_MAX,
-			  pause_set_policy, info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_PAUSE_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/privflags.c

@@ -18,11 +18,9 @@ struct privflags_reply_data {
 #define PRIVFLAGS_REPDATA(__reply_base) \
 	container_of(__reply_base, struct privflags_reply_data, base)
 
-static const struct nla_policy
-privflags_get_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = {
-	[ETHTOOL_A_PRIVFLAGS_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_PRIVFLAGS_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_PRIVFLAGS_FLAGS]		= { .type = NLA_REJECT },
+const struct nla_policy ethnl_privflags_get_policy[] = {
+	[ETHTOOL_A_PRIVFLAGS_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int ethnl_get_priv_flags_info(struct net_device *dev,
@@ -124,10 +122,8 @@ const struct ethnl_request_ops ethnl_privflags_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_PRIVFLAGS_GET,
 	.reply_cmd		= ETHTOOL_MSG_PRIVFLAGS_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_PRIVFLAGS_HEADER,
-	.max_attr		= ETHTOOL_A_PRIVFLAGS_MAX,
 	.req_info_size		= sizeof(struct privflags_req_info),
 	.reply_data_size	= sizeof(struct privflags_reply_data),
-	.request_policy		= privflags_get_policy,
 
 	.prepare_data		= privflags_prepare_data,
 	.reply_size		= privflags_reply_size,
@@ -137,18 +133,17 @@ const struct ethnl_request_ops ethnl_privflags_request_ops = {
 
 /* PRIVFLAGS_SET */
 
-static const struct nla_policy
-privflags_set_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = {
-	[ETHTOOL_A_PRIVFLAGS_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_PRIVFLAGS_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_privflags_set_policy[] = {
+	[ETHTOOL_A_PRIVFLAGS_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_PRIVFLAGS_FLAGS]		= { .type = NLA_NESTED },
 };
 
 int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_PRIVFLAGS_MAX + 1];
 	const char (*names)[ETH_GSTRING_LEN] = NULL;
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	const struct ethtool_ops *ops;
 	struct net_device *dev;
 	unsigned int nflags;
@@ -157,11 +152,6 @@ int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
 	u32 flags;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_PRIVFLAGS_MAX, privflags_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	if (!tb[ETHTOOL_A_PRIVFLAGS_FLAGS])
 		return -EINVAL;
 	ret = ethnl_bitset_is_compact(tb[ETHTOOL_A_PRIVFLAGS_FLAGS], &compact);

net/ethtool/rings.c

@@ -15,18 +15,9 @@ struct rings_reply_data {
 #define RINGS_REPDATA(__reply_base) \
 	container_of(__reply_base, struct rings_reply_data, base)
 
-static const struct nla_policy
-rings_get_policy[ETHTOOL_A_RINGS_MAX + 1] = {
-	[ETHTOOL_A_RINGS_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_RINGS_RX_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_RX_MINI_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_RX_JUMBO_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_TX_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_RX]			= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_RX_MINI]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_RX_JUMBO]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_TX]			= { .type = NLA_REJECT },
+const struct nla_policy ethnl_rings_get_policy[] = {
+	[ETHTOOL_A_RINGS_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int rings_prepare_data(const struct ethnl_req_info *req_base,
@@ -97,10 +88,8 @@ const struct ethnl_request_ops ethnl_rings_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_RINGS_GET,
 	.reply_cmd		= ETHTOOL_MSG_RINGS_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_RINGS_HEADER,
-	.max_attr		= ETHTOOL_A_RINGS_MAX,
 	.req_info_size		= sizeof(struct rings_req_info),
 	.reply_data_size	= sizeof(struct rings_reply_data),
-	.request_policy		= rings_get_policy,
 
 	.prepare_data		= rings_prepare_data,
 	.reply_size		= rings_reply_size,
@@ -109,14 +98,9 @@ const struct ethnl_request_ops ethnl_rings_request_ops = {
 
 /* RINGS_SET */
 
-static const struct nla_policy
-rings_set_policy[ETHTOOL_A_RINGS_MAX + 1] = {
-	[ETHTOOL_A_RINGS_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_RINGS_RX_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_RX_MINI_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_RX_JUMBO_MAX]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_RINGS_TX_MAX]		= { .type = NLA_REJECT },
+const struct nla_policy ethnl_rings_set_policy[] = {
+	[ETHTOOL_A_RINGS_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_RINGS_RX]			= { .type = NLA_U32 },
 	[ETHTOOL_A_RINGS_RX_MINI]		= { .type = NLA_U32 },
 	[ETHTOOL_A_RINGS_RX_JUMBO]		= { .type = NLA_U32 },
@@ -125,20 +109,15 @@ rings_set_policy[ETHTOOL_A_RINGS_MAX + 1] = {
 
 int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
 {
-	struct nlattr *tb[ETHTOOL_A_RINGS_MAX + 1];
 	struct ethtool_ringparam ringparam = {};
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	const struct nlattr *err_attr;
 	const struct ethtool_ops *ops;
 	struct net_device *dev;
 	bool mod = false;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
-			  ETHTOOL_A_RINGS_MAX, rings_set_policy,
-			  info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_RINGS_HEADER],
 					 genl_info_net(info), info->extack,

net/ethtool/strset.c

@@ -99,18 +99,14 @@ struct strset_reply_data {
 #define STRSET_REPDATA(__reply_base) \
 	container_of(__reply_base, struct strset_reply_data, base)
 
-static const struct nla_policy strset_get_policy[ETHTOOL_A_STRSET_MAX + 1] = {
-	[ETHTOOL_A_STRSET_UNSPEC]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_STRSET_HEADER]	= { .type = NLA_NESTED },
+const struct nla_policy ethnl_strset_get_policy[] = {
+	[ETHTOOL_A_STRSET_HEADER]	=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_STRSET_STRINGSETS]	= { .type = NLA_NESTED },
 };
 
-static const struct nla_policy
-get_stringset_policy[ETHTOOL_A_STRINGSET_MAX + 1] = {
-	[ETHTOOL_A_STRINGSET_UNSPEC]	= { .type = NLA_REJECT },
+static const struct nla_policy get_stringset_policy[] = {
 	[ETHTOOL_A_STRINGSET_ID]	= { .type = NLA_U32 },
-	[ETHTOOL_A_STRINGSET_COUNT]	= { .type = NLA_REJECT },
-	[ETHTOOL_A_STRINGSET_STRINGS]	= { .type = NLA_REJECT },
 };
 
 /**
@@ -138,10 +134,10 @@ static bool strset_include(const struct strset_req_info *info,
 static int strset_get_id(const struct nlattr *nest, u32 *val,
 			 struct netlink_ext_ack *extack)
 {
-	struct nlattr *tb[ETHTOOL_A_STRINGSET_MAX + 1];
+	struct nlattr *tb[ARRAY_SIZE(get_stringset_policy)];
 	int ret;
 
-	ret = nla_parse_nested(tb, ETHTOOL_A_STRINGSET_MAX, nest,
+	ret = nla_parse_nested(tb, ARRAY_SIZE(get_stringset_policy) - 1, nest,
 			       get_stringset_policy, extack);
 	if (ret < 0)
 		return ret;
@@ -152,9 +148,7 @@ static int strset_get_id(const struct nlattr *nest, u32 *val,
 	return 0;
 }
 
-static const struct nla_policy
-strset_stringsets_policy[ETHTOOL_A_STRINGSETS_MAX + 1] = {
-	[ETHTOOL_A_STRINGSETS_UNSPEC]		= { .type = NLA_REJECT },
+static const struct nla_policy strset_stringsets_policy[] = {
 	[ETHTOOL_A_STRINGSETS_STRINGSET]	= { .type = NLA_NESTED },
 };
 
@@ -169,7 +163,8 @@ static int strset_parse_request(struct ethnl_req_info *req_base,
 
 	if (!nest)
 		return 0;
-	ret = nla_validate_nested(nest, ETHTOOL_A_STRINGSETS_MAX,
+	ret = nla_validate_nested(nest,
+				  ARRAY_SIZE(strset_stringsets_policy) - 1,
 				  strset_stringsets_policy, extack);
 	if (ret < 0)
 		return ret;
@@ -445,10 +440,8 @@ const struct ethnl_request_ops ethnl_strset_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_STRSET_GET,
 	.reply_cmd		= ETHTOOL_MSG_STRSET_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_STRSET_HEADER,
-	.max_attr		= ETHTOOL_A_STRSET_MAX,
 	.req_info_size		= sizeof(struct strset_req_info),
 	.reply_data_size	= sizeof(struct strset_reply_data),
-	.request_policy		= strset_get_policy,
 	.allow_nodev_do		= true,
 
 	.parse_request		= strset_parse_request,

net/ethtool/tsinfo.c

@@ -18,14 +18,9 @@ struct tsinfo_reply_data {
 #define TSINFO_REPDATA(__reply_base) \
 	container_of(__reply_base, struct tsinfo_reply_data, base)
 
-static const struct nla_policy
-tsinfo_get_policy[ETHTOOL_A_TSINFO_MAX + 1] = {
-	[ETHTOOL_A_TSINFO_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_TSINFO_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_TSINFO_TIMESTAMPING]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_TSINFO_TX_TYPES]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_TSINFO_RX_FILTERS]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_TSINFO_PHC_INDEX]		= { .type = NLA_REJECT },
+const struct nla_policy ethnl_tsinfo_get_policy[] = {
+	[ETHTOOL_A_TSINFO_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int tsinfo_prepare_data(const struct ethnl_req_info *req_base,
@@ -132,10 +127,8 @@ const struct ethnl_request_ops ethnl_tsinfo_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_TSINFO_GET,
 	.reply_cmd		= ETHTOOL_MSG_TSINFO_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_TSINFO_HEADER,
-	.max_attr		= ETHTOOL_A_TSINFO_MAX,
 	.req_info_size		= sizeof(struct tsinfo_req_info),
 	.reply_data_size	= sizeof(struct tsinfo_reply_data),
-	.request_policy		= tsinfo_get_policy,
 
 	.prepare_data		= tsinfo_prepare_data,
 	.reply_size		= tsinfo_reply_size,

net/ethtool/tunnels.c

@@ -8,10 +8,9 @@
 #include "common.h"
 #include "netlink.h"
 
-static const struct nla_policy
-ethtool_tunnel_info_policy[ETHTOOL_A_TUNNEL_INFO_MAX + 1] = {
-	[ETHTOOL_A_TUNNEL_INFO_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_TUNNEL_INFO_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_tunnel_info_get_policy[] = {
+	[ETHTOOL_A_TUNNEL_INFO_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN == ilog2(UDP_TUNNEL_TYPE_VXLAN));
@@ -161,35 +160,19 @@ ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
 	return -EMSGSIZE;
 }
 
-static int
-ethnl_tunnel_info_req_parse(struct ethnl_req_info *req_info,
-			    const struct nlmsghdr *nlhdr, struct net *net,
-			    struct netlink_ext_ack *extack, bool require_dev)
-{
-	struct nlattr *tb[ETHTOOL_A_TUNNEL_INFO_MAX + 1];
-	int ret;
-
-	ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_TUNNEL_INFO_MAX,
-			  ethtool_tunnel_info_policy, extack);
-	if (ret < 0)
-		return ret;
-
-	return ethnl_parse_header_dev_get(req_info,
-					  tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
-					  net, extack, require_dev);
-}
-
 int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	struct sk_buff *rskb;
 	void *reply_payload;
 	int reply_len;
 	int ret;
 
-	ret = ethnl_tunnel_info_req_parse(&req_info, info->nlhdr,
-					  genl_info_net(info), info->extack,
-					  true);
+	ret = ethnl_parse_header_dev_get(&req_info,
+					 tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
+					 genl_info_net(info), info->extack,
+					 true);
 	if (ret < 0)
 		return ret;
 
@@ -233,16 +216,19 @@ struct ethnl_tunnel_info_dump_ctx {
 
 int ethnl_tunnel_info_start(struct netlink_callback *cb)
 {
+	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 	struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
+	struct nlattr **tb = info->attrs;
 	int ret;
 
 	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 
 	memset(ctx, 0, sizeof(*ctx));
 
-	ret = ethnl_tunnel_info_req_parse(&ctx->req_info, cb->nlh,
-					  sock_net(cb->skb->sk), cb->extack,
-					  false);
+	ret = ethnl_parse_header_dev_get(&ctx->req_info,
+					 tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
+					 sock_net(cb->skb->sk), cb->extack,
+					 false);
 	if (ctx->req_info.dev) {
 		dev_put(ctx->req_info.dev);
 		ctx->req_info.dev = NULL;

net/ethtool/wol.c

@@ -17,12 +17,9 @@ struct wol_reply_data {
 #define WOL_REPDATA(__reply_base) \
 	container_of(__reply_base, struct wol_reply_data, base)
 
-static const struct nla_policy
-wol_get_policy[ETHTOOL_A_WOL_MAX + 1] = {
-	[ETHTOOL_A_WOL_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_WOL_HEADER]		= { .type = NLA_NESTED },
-	[ETHTOOL_A_WOL_MODES]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_WOL_SOPASS]		= { .type = NLA_REJECT },
+const struct nla_policy ethnl_wol_get_policy[] = {
+	[ETHTOOL_A_WOL_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 };
 
 static int wol_prepare_data(const struct ethnl_req_info *req_base,
@@ -89,10 +86,8 @@ const struct ethnl_request_ops ethnl_wol_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_WOL_GET,
 	.reply_cmd		= ETHTOOL_MSG_WOL_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_WOL_HEADER,
-	.max_attr		= ETHTOOL_A_WOL_MAX,
 	.req_info_size		= sizeof(struct wol_req_info),
 	.reply_data_size	= sizeof(struct wol_reply_data),
-	.request_policy		= wol_get_policy,
 
 	.prepare_data		= wol_prepare_data,
 	.reply_size		= wol_reply_size,
@@ -101,10 +96,9 @@ const struct ethnl_request_ops ethnl_wol_request_ops = {
 
 /* WOL_SET */
 
-static const struct nla_policy
-wol_set_policy[ETHTOOL_A_WOL_MAX + 1] = {
-	[ETHTOOL_A_WOL_UNSPEC]		= { .type = NLA_REJECT },
-	[ETHTOOL_A_WOL_HEADER]		= { .type = NLA_NESTED },
+const struct nla_policy ethnl_wol_set_policy[] = {
+	[ETHTOOL_A_WOL_HEADER]		=
+		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_WOL_MODES]		= { .type = NLA_NESTED },
 	[ETHTOOL_A_WOL_SOPASS]		= { .type = NLA_BINARY,
 					    .len = SOPASS_MAX },
@@ -113,16 +107,12 @@ wol_set_policy[ETHTOOL_A_WOL_MAX + 1] = {
 int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info)
 {
 	struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
-	struct nlattr *tb[ETHTOOL_A_WOL_MAX + 1];
 	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
 	struct net_device *dev;
 	bool mod = false;
 	int ret;
 
-	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_WOL_MAX,
-			  wol_set_policy, info->extack);
-	if (ret < 0)
-		return ret;
 	ret = ethnl_parse_header_dev_get(&req_info, tb[ETHTOOL_A_WOL_HEADER],
 					 genl_info_net(info), info->extack,
 					 true);

net/netlink/policy.c

@@ -263,6 +263,14 @@ int netlink_policy_dump_write(struct sk_buff *skb,
 		else
 			type = NL_ATTR_TYPE_U64;
 
+		if (pt->validation_type == NLA_VALIDATE_MASK) {
+			if (nla_put_u64_64bit(skb, NL_POLICY_TYPE_ATTR_MASK,
+					      pt->mask,
+					      NL_POLICY_TYPE_ATTR_PAD))
+				goto nla_put_failure;
+			break;
+		}
+
 		nla_get_range_unsigned(pt, &range);
 
 		if (nla_put_u64_64bit(skb, NL_POLICY_TYPE_ATTR_MIN_VALUE_U,