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-rw-r--r--include/net/cfg80211.h25
-rw-r--r--include/uapi/linux/nl80211.h29
-rw-r--r--net/wireless/nl80211.c86
3 files changed, 137 insertions, 3 deletions
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 05aae22..bb748c4 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1437,6 +1437,10 @@ struct cfg80211_ssid {
* @aborted: (internal) scan request was notified as aborted
* @notified: (internal) scan request was notified as done or aborted
* @no_cck: used to send probe requests at non CCK rate in 2GHz band
+ * @mac_addr: MAC address used with randomisation
+ * @mac_addr_mask: MAC address mask used with randomisation, bits that
+ * are 0 in the mask should be randomised, bits that are 1 should
+ * be taken from the @mac_addr
*/
struct cfg80211_scan_request {
struct cfg80211_ssid *ssids;
@@ -1451,6 +1455,9 @@ struct cfg80211_scan_request {
struct wireless_dev *wdev;
+ u8 mac_addr[ETH_ALEN] __aligned(2);
+ u8 mac_addr_mask[ETH_ALEN] __aligned(2);
+
/* internal */
struct wiphy *wiphy;
unsigned long scan_start;
@@ -1461,6 +1468,17 @@ struct cfg80211_scan_request {
struct ieee80211_channel *channels[0];
};
+static inline void get_random_mask_addr(u8 *buf, const u8 *addr, const u8 *mask)
+{
+ int i;
+
+ get_random_bytes(buf, ETH_ALEN);
+ for (i = 0; i < ETH_ALEN; i++) {
+ buf[i] &= ~mask[i];
+ buf[i] |= addr[i] & mask[i];
+ }
+}
+
/**
* struct cfg80211_match_set - sets of attributes to match
*
@@ -1494,6 +1512,10 @@ struct cfg80211_match_set {
* @channels: channels to scan
* @min_rssi_thold: for drivers only supporting a single threshold, this
* contains the minimum over all matchsets
+ * @mac_addr: MAC address used with randomisation
+ * @mac_addr_mask: MAC address mask used with randomisation, bits that
+ * are 0 in the mask should be randomised, bits that are 1 should
+ * be taken from the @mac_addr
*/
struct cfg80211_sched_scan_request {
struct cfg80211_ssid *ssids;
@@ -1508,6 +1530,9 @@ struct cfg80211_sched_scan_request {
int n_match_sets;
s32 min_rssi_thold;
+ u8 mac_addr[ETH_ALEN] __aligned(2);
+ u8 mac_addr_mask[ETH_ALEN] __aligned(2);
+
/* internal */
struct wiphy *wiphy;
struct net_device *dev;
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index d232081..a99081e 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1686,6 +1686,8 @@ enum nl80211_commands {
*
* @NL80211_ATTR_OPER_CLASS: operating class
*
+ * @NL80211_ATTR_MAC_MASK: MAC address mask
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2041,6 +2043,8 @@ enum nl80211_attrs {
NL80211_ATTR_OPER_CLASS,
+ NL80211_ATTR_MAC_MASK,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -4139,6 +4143,18 @@ enum nl80211_ap_sme_features {
* See 'macaddr' field in the vif_params (cfg80211.h).
* @NL80211_FEATURE_TDLS_CHANNEL_SWITCH: Driver supports channel switching when
* operating as a TDLS peer.
+ * @NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR: This device/driver supports using a
+ * random MAC address during scan (if the device is unassociated); the
+ * %NL80211_SCAN_FLAG_RANDOM_ADDR flag may be set for scans and the MAC
+ * address mask/value will be used.
+ * @NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR: This device/driver supports
+ * using a random MAC address for every scan iteration during scheduled
+ * scan (while not associated), the %NL80211_SCAN_FLAG_RANDOM_ADDR may
+ * be set for scheduled scan and the MAC address mask/value will be used.
+ * @NL80211_FEATURE_ND_RANDOM_MAC_ADDR: This device/driver supports using a
+ * random MAC address for every scan iteration during "net detect", i.e.
+ * scan in unassociated WoWLAN, the %NL80211_SCAN_FLAG_RANDOM_ADDR may
+ * be set for scheduled scan and the MAC address mask/value will be used.
*/
enum nl80211_feature_flags {
NL80211_FEATURE_SK_TX_STATUS = 1 << 0,
@@ -4170,6 +4186,9 @@ enum nl80211_feature_flags {
NL80211_FEATURE_SUPPORTS_WMM_ADMISSION = 1 << 26,
NL80211_FEATURE_MAC_ON_CREATE = 1 << 27,
NL80211_FEATURE_TDLS_CHANNEL_SWITCH = 1 << 28,
+ NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR = 1 << 29,
+ NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR = 1 << 30,
+ NL80211_FEATURE_ND_RANDOM_MAC_ADDR = 1 << 31,
};
/**
@@ -4218,11 +4237,21 @@ enum nl80211_connect_failed_reason {
* dangerous because will destroy stations performance as a lot of frames
* will be lost while scanning off-channel, therefore it must be used only
* when really needed
+ * @NL80211_SCAN_FLAG_RANDOM_ADDR: use a random MAC address for this scan (or
+ * for scheduled scan: a different one for every scan iteration). When the
+ * flag is set, depending on device capabilities the @NL80211_ATTR_MAC and
+ * @NL80211_ATTR_MAC_MASK attributes may also be given in which case only
+ * the masked bits will be preserved from the MAC address and the remainder
+ * randomised. If the attributes are not given full randomisation (46 bits,
+ * locally administered 1, multicast 0) is assumed.
+ * This flag must not be requested when the feature isn't supported, check
+ * the nl80211 feature flags for the device.
*/
enum nl80211_scan_flags {
NL80211_SCAN_FLAG_LOW_PRIORITY = 1<<0,
NL80211_SCAN_FLAG_FLUSH = 1<<1,
NL80211_SCAN_FLAG_AP = 1<<2,
+ NL80211_SCAN_FLAG_RANDOM_ADDR = 1<<3,
};
/**
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 3ec7dc5..dd5a827 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -395,6 +395,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_USER_PRIO] = { .type = NLA_U8 },
[NL80211_ATTR_ADMITTED_TIME] = { .type = NLA_U16 },
[NL80211_ATTR_SMPS_MODE] = { .type = NLA_U8 },
+ [NL80211_ATTR_MAC_MASK] = { .len = ETH_ALEN },
};
/* policy for the key attributes */
@@ -5481,6 +5482,43 @@ static int validate_scan_freqs(struct nlattr *freqs)
return n_channels;
}
+static int nl80211_parse_random_mac(struct nlattr **attrs,
+ u8 *mac_addr, u8 *mac_addr_mask)
+{
+ int i;
+
+ if (!attrs[NL80211_ATTR_MAC] && !attrs[NL80211_ATTR_MAC_MASK]) {
+ memset(mac_addr, 0, ETH_ALEN);
+ memset(mac_addr_mask, 0, ETH_ALEN);
+ mac_addr[0] = 0x2;
+ mac_addr_mask[0] = 0x3;
+
+ return 0;
+ }
+
+ /* need both or none */
+ if (!attrs[NL80211_ATTR_MAC] || !attrs[NL80211_ATTR_MAC_MASK])
+ return -EINVAL;
+
+ memcpy(mac_addr, nla_data(attrs[NL80211_ATTR_MAC]), ETH_ALEN);
+ memcpy(mac_addr_mask, nla_data(attrs[NL80211_ATTR_MAC_MASK]), ETH_ALEN);
+
+ /* don't allow or configure an mcast address */
+ if (!is_multicast_ether_addr(mac_addr_mask) ||
+ is_multicast_ether_addr(mac_addr))
+ return -EINVAL;
+
+ /*
+ * allow users to pass a MAC address that has bits set outside
+ * of the mask, but don't bother drivers with having to deal
+ * with such bits
+ */
+ for (i = 0; i < ETH_ALEN; i++)
+ mac_addr[i] &= mac_addr_mask[i];
+
+ return 0;
+}
+
static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
@@ -5658,6 +5696,25 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
err = -EOPNOTSUPP;
goto out_free;
}
+
+ if (request->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
+ if (!(wiphy->features &
+ NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR)) {
+ err = -EOPNOTSUPP;
+ goto out_free;
+ }
+
+ if (wdev->current_bss) {
+ err = -EOPNOTSUPP;
+ goto out_free;
+ }
+
+ err = nl80211_parse_random_mac(info->attrs,
+ request->mac_addr,
+ request->mac_addr_mask);
+ if (err)
+ goto out_free;
+ }
}
request->no_cck =
@@ -5685,7 +5742,7 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
}
static struct cfg80211_sched_scan_request *
-nl80211_parse_sched_scan(struct wiphy *wiphy,
+nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
struct nlattr **attrs)
{
struct cfg80211_sched_scan_request *request;
@@ -5934,6 +5991,28 @@ nl80211_parse_sched_scan(struct wiphy *wiphy,
err = -EOPNOTSUPP;
goto out_free;
}
+
+ if (request->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
+ u32 flg = NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR;
+
+ if (!wdev) /* must be net-detect */
+ flg = NL80211_FEATURE_ND_RANDOM_MAC_ADDR;
+
+ if (!(wiphy->features & flg)) {
+ err = -EOPNOTSUPP;
+ goto out_free;
+ }
+
+ if (wdev && wdev->current_bss) {
+ err = -EOPNOTSUPP;
+ goto out_free;
+ }
+
+ err = nl80211_parse_random_mac(attrs, request->mac_addr,
+ request->mac_addr_mask);
+ if (err)
+ goto out_free;
+ }
}
request->interval = interval;
@@ -5951,6 +6030,7 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct net_device *dev = info->user_ptr[1];
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
int err;
if (!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN) ||
@@ -5960,7 +6040,7 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
if (rdev->sched_scan_req)
return -EINPROGRESS;
- rdev->sched_scan_req = nl80211_parse_sched_scan(&rdev->wiphy,
+ rdev->sched_scan_req = nl80211_parse_sched_scan(&rdev->wiphy, wdev,
info->attrs);
err = PTR_ERR_OR_ZERO(rdev->sched_scan_req);
if (err)
@@ -8721,7 +8801,7 @@ static int nl80211_parse_wowlan_nd(struct cfg80211_registered_device *rdev,
if (err)
goto out;
- trig->nd_config = nl80211_parse_sched_scan(&rdev->wiphy, tb);
+ trig->nd_config = nl80211_parse_sched_scan(&rdev->wiphy, NULL, tb);
err = PTR_ERR_OR_ZERO(trig->nd_config);
if (err)
trig->nd_config = NULL;
generated by cgit v0.10.2 at 2024-08-04 11:33:44 (GMT)