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Commit 23323289 authored by Johannes Berg's avatar Johannes Berg
Browse files

netlink: reduce NLA_POLICY_NESTED{,_ARRAY} arguments 



In typical cases, there's no need to pass both the maxattr
and the policy array pointer, as the maxattr should just be
ARRAY_SIZE(policy) - 1. Therefore, to be less error prone,
just remove the maxattr argument from the default macros
and deduce the size accordingly.

Leave the original macros with a leading underscore to use
here and in case somebody needs to pass a policy pointer
where the policy isn't declared in the same place and thus
ARRAY_SIZE() cannot be used.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 752cfee9

include/net/netlink.h

+6 −2
Original line number Diff line number Diff line
@@ -306,10 +306,14 @@ struct nla_policy { 
#define NLA_POLICY_ETH_ADDR		NLA_POLICY_EXACT_LEN(ETH_ALEN)

#define NLA_POLICY_ETH_ADDR_COMPAT	NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN)



#define NLA_POLICY_NESTED(maxattr, policy) \

#define _NLA_POLICY_NESTED(maxattr, policy) \

	{ .type = NLA_NESTED, .validation_data = policy, .len = maxattr }

#define NLA_POLICY_NESTED_ARRAY(maxattr, policy) \

#define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \

	{ .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr }

#define NLA_POLICY_NESTED(policy) \

	_NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy)

#define NLA_POLICY_NESTED_ARRAY(policy) \

	_NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy)



#define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))

#define NLA_ENSURE_INT_TYPE(tp)				\

net/wireless/nl80211.c

+5 −10
Original line number Diff line number Diff line
@@ -259,15 +259,13 @@ nl80211_pmsr_ftm_req_attr_policy[NL80211_PMSR_FTM_REQ_ATTR_MAX + 1] = { 
static const struct nla_policy

nl80211_pmsr_req_data_policy[NL80211_PMSR_TYPE_MAX + 1] = {

	[NL80211_PMSR_TYPE_FTM] =

		NLA_POLICY_NESTED(NL80211_PMSR_FTM_REQ_ATTR_MAX,

				  nl80211_pmsr_ftm_req_attr_policy),

		NLA_POLICY_NESTED(nl80211_pmsr_ftm_req_attr_policy),

};



static const struct nla_policy

nl80211_pmsr_req_attr_policy[NL80211_PMSR_REQ_ATTR_MAX + 1] = {

	[NL80211_PMSR_REQ_ATTR_DATA] =

		NLA_POLICY_NESTED(NL80211_PMSR_TYPE_MAX,

				  nl80211_pmsr_req_data_policy),

		NLA_POLICY_NESTED(nl80211_pmsr_req_data_policy),

	[NL80211_PMSR_REQ_ATTR_GET_AP_TSF] = { .type = NLA_FLAG },

};
@@ -280,8 +278,7 @@ nl80211_psmr_peer_attr_policy[NL80211_PMSR_PEER_ATTR_MAX + 1] = { 
	 */

	[NL80211_PMSR_PEER_ATTR_CHAN] = { .type = NLA_NESTED },

	[NL80211_PMSR_PEER_ATTR_REQ] =

		NLA_POLICY_NESTED(NL80211_PMSR_REQ_ATTR_MAX,

				  nl80211_pmsr_req_attr_policy),

		NLA_POLICY_NESTED(nl80211_pmsr_req_attr_policy),

	[NL80211_PMSR_PEER_ATTR_RESP] = { .type = NLA_REJECT },

};
@@ -292,8 +289,7 @@ nl80211_pmsr_attr_policy[NL80211_PMSR_ATTR_MAX + 1] = { 
	[NL80211_PMSR_ATTR_RANDOMIZE_MAC_ADDR] = { .type = NLA_REJECT },

	[NL80211_PMSR_ATTR_TYPE_CAPA] = { .type = NLA_REJECT },

	[NL80211_PMSR_ATTR_PEERS] =

		NLA_POLICY_NESTED_ARRAY(NL80211_PMSR_PEER_ATTR_MAX,

					nl80211_psmr_peer_attr_policy),

		NLA_POLICY_NESTED_ARRAY(nl80211_psmr_peer_attr_policy),

};



const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
@@ -555,8 +551,7 @@ const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = { 
	},

	[NL80211_ATTR_TIMEOUT] = NLA_POLICY_MIN(NLA_U32, 1),

	[NL80211_ATTR_PEER_MEASUREMENTS] =

		NLA_POLICY_NESTED(NL80211_PMSR_ATTR_MAX,

				  nl80211_pmsr_attr_policy),

		NLA_POLICY_NESTED(nl80211_pmsr_attr_policy),

	[NL80211_ATTR_AIRTIME_WEIGHT] = NLA_POLICY_MIN(NLA_U16, 1),

};