Commit 81077e82 authored by Lukáš Turek's avatar Lukáš Turek Committed by John W. Linville
Browse files

nl80211: Add new WIPHY attribute COVERAGE_CLASS 



The new attribute NL80211_ATTR_WIPHY_COVERAGE_CLASS sets IEEE 802.11
Coverage Class, which depends on maximum distance of nodes in a
wireless network. It's required for long distance links (more than a few
hundred meters).

The attribute is now ignored by two non-mac80211 drivers, rndis and
iwmc3200wifi, together with WIPHY_PARAM_RETRY_SHORT and
WIPHY_PARAM_RETRY_LONG. If it turns out to be a problem, we could split
set_wiphy_params callback or add new capability bits.

Signed-off-by: default avatarLukas Turek <8an@praha12.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 14acdde6

include/linux/nl80211.h

+4 −0
Original line number Diff line number Diff line
@@ -430,6 +430,8 @@ enum nl80211_commands { 
 * @NL80211_ATTR_WIPHY_RTS_THRESHOLD: RTS threshold (TX frames with length

 *	larger than or equal to this use RTS/CTS handshake); allowed range:

 *	0..65536, disable with (u32)-1; dot11RTSThreshold; u32

 * @NL80211_ATTR_WIPHY_COVERAGE_CLASS: Coverage Class as defined by IEEE 802.11

 *	section 7.3.2.9; dot11CoverageClass; u8

 *

 * @NL80211_ATTR_IFINDEX: network interface index of the device to operate on

 * @NL80211_ATTR_IFNAME: network interface name
@@ -779,6 +781,8 @@ enum nl80211_attrs { 


	NL80211_ATTR_COOKIE,



	NL80211_ATTR_WIPHY_COVERAGE_CLASS,



	/* add attributes here, update the policy in nl80211.c */



	__NL80211_ATTR_AFTER_LAST,

include/net/cfg80211.h

+2 −0
Original line number Diff line number Diff line
@@ -837,6 +837,7 @@ enum wiphy_params_flags { 
	WIPHY_PARAM_RETRY_LONG		= 1 << 1,

	WIPHY_PARAM_FRAG_THRESHOLD	= 1 << 2,

	WIPHY_PARAM_RTS_THRESHOLD	= 1 << 3,

	WIPHY_PARAM_COVERAGE_CLASS	= 1 << 4,

};



/**
@@ -1236,6 +1237,7 @@ struct wiphy { 
	u8 retry_long;

	u32 frag_threshold;

	u32 rts_threshold;

	u8 coverage_class;



	char fw_version[ETHTOOL_BUSINFO_LEN];

	u32 hw_version;

net/wireless/core.c

+1 −0
Original line number Diff line number Diff line
@@ -402,6 +402,7 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 
	rdev->wiphy.retry_long = 4;

	rdev->wiphy.frag_threshold = (u32) -1;

	rdev->wiphy.rts_threshold = (u32) -1;

	rdev->wiphy.coverage_class = 0;



	return &rdev->wiphy;

}

net/wireless/nl80211.c

+15 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = { 
	[NL80211_ATTR_WIPHY_RETRY_LONG] = { .type = NLA_U8 },

	[NL80211_ATTR_WIPHY_FRAG_THRESHOLD] = { .type = NLA_U32 },

	[NL80211_ATTR_WIPHY_RTS_THRESHOLD] = { .type = NLA_U32 },

	[NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },



	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },

	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
@@ -444,6 +445,8 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags, 
		    dev->wiphy.frag_threshold);

	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_RTS_THRESHOLD,

		    dev->wiphy.rts_threshold);

	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS,

		    dev->wiphy.coverage_class);



	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,

		   dev->wiphy.max_scan_ssids);
@@ -684,6 +687,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) 
	u32 changed;

	u8 retry_short = 0, retry_long = 0;

	u32 frag_threshold = 0, rts_threshold = 0;

	u8 coverage_class = 0;



	rtnl_lock();
@@ -806,9 +810,16 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) 
		changed |= WIPHY_PARAM_RTS_THRESHOLD;

	}



	if (info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]) {

		coverage_class = nla_get_u8(

			info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]);

		changed |= WIPHY_PARAM_COVERAGE_CLASS;

	}



	if (changed) {

		u8 old_retry_short, old_retry_long;

		u32 old_frag_threshold, old_rts_threshold;

		u8 old_coverage_class;



		if (!rdev->ops->set_wiphy_params) {

			result = -EOPNOTSUPP;
@@ -819,6 +830,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) 
		old_retry_long = rdev->wiphy.retry_long;

		old_frag_threshold = rdev->wiphy.frag_threshold;

		old_rts_threshold = rdev->wiphy.rts_threshold;

		old_coverage_class = rdev->wiphy.coverage_class;



		if (changed & WIPHY_PARAM_RETRY_SHORT)

			rdev->wiphy.retry_short = retry_short;
@@ -828,6 +840,8 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) 
			rdev->wiphy.frag_threshold = frag_threshold;

		if (changed & WIPHY_PARAM_RTS_THRESHOLD)

			rdev->wiphy.rts_threshold = rts_threshold;

		if (changed & WIPHY_PARAM_COVERAGE_CLASS)

			rdev->wiphy.coverage_class = coverage_class;



		result = rdev->ops->set_wiphy_params(&rdev->wiphy, changed);

		if (result) {
@@ -835,6 +849,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) 
			rdev->wiphy.retry_long = old_retry_long;

			rdev->wiphy.frag_threshold = old_frag_threshold;

			rdev->wiphy.rts_threshold = old_rts_threshold;

			rdev->wiphy.coverage_class = old_coverage_class;

		}

	}

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