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: Lukas Turek <8an@praha12.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 2bfbe88..d4c556d 100644 (file)
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -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,

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index add7993..a8d5d04 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -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;

diff --git a/net/wireless/core.c b/net/wireless/core.c
index c2a2c56..0a545bb 100644 (file)
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -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;
 }

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index e3bee3c..c09fbcd 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -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;
                }
        }