This makes it easier for drivers that generate Beacon and Probe Response
frames internally (in firmware most likely) in AP mode.
Signed-off-by: Jouni Malinen <jouni@xxxxxxxxxxxxxxxx>
---
include/linux/nl80211.h | 24 ++++++++++++++++++++++++
include/net/cfg80211.h | 7 +++++++
net/wireless/nl80211.c | 29 +++++++++++++++++++++++++++++
3 files changed, 60 insertions(+), 0 deletions(-)
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 8ad70dc..227ee9a 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -161,6 +161,9 @@
* @NL80211_CMD_SET_BEACON: set the beacon on an access point interface
* using the %NL80211_ATTR_BEACON_INTERVAL, %NL80211_ATTR_DTIM_PERIOD,
* %NL80211_ATTR_BEACON_HEAD and %NL80211_ATTR_BEACON_TAIL attributes.
+ * Following attributes are provided for drivers that generate full Beacon
+ * and Probe Response frames internally: %NL80211_ATTR_SSID,
+ * %NL80211_ATTR_HIDDEN_SSID.
* @NL80211_CMD_NEW_BEACON: add a new beacon to an access point interface,
* parameters are like for %NL80211_CMD_SET_BEACON.
* @NL80211_CMD_DEL_BEACON: remove the beacon, stop sending it
@@ -1019,6 +1022,10 @@ enum nl80211_commands {
* being a list of supported rates as defined by IEEE 802.11 7.3.2.2 but
* without the length restriction (at most %NL80211_MAX_SUPP_RATES).
*
+ * @NL80211_ATTR_HIDDEN_SSID: indicates whether SSID is to be hidden from Beacon
+ * and Probe Response (when response to wildcard Probe Request); see
+ * &enum nl80211_hidden_ssid, represented as a u32
+ *
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -1224,6 +1231,8 @@ enum nl80211_attrs {
NL80211_ATTR_SCAN_SUPP_RATES,
+ NL80211_ATTR_HIDDEN_SSID,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -2430,4 +2439,19 @@ enum nl80211_rekey_data {
MAX_NL80211_REKEY_DATA = NUM_NL80211_REKEY_DATA - 1
};
+/**
+ * enum nl80211_hidden_ssid - values for %NL80211_ATTR_HIDDEN_SSID
+ * @NL80211_HIDDEN_SSID_NOT_IN_USE: do not hide SSID (i.e., broadcast it in
+ * Beacon frames)
+ * @NL80211_HIDDEN_SSID_ZERO_LEN: hide SSID by using zero-length SSID element
+ * in Beacon frames
+ * @NL80211_HIDDEN_SSID_ZERO_CONTENTS: hide SSID by using correct length of SSID
+ * element in Beacon frames but zero out each byte in the SSID
+ */
+enum nl80211_hidden_ssid {
+ NL80211_HIDDEN_SSID_NOT_IN_USE,
+ NL80211_HIDDEN_SSID_ZERO_LEN,
+ NL80211_HIDDEN_SSID_ZERO_CONTENTS
+};
+
#endif /* __LINUX_NL80211_H */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 779e300..27c5eec 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -346,11 +346,18 @@ struct survey_info {
* @dtim_period: DTIM period or zero if not changed
* @head_len: length of @head
* @tail_len: length of @tail
+ * @ssid: SSID to be used in the BSS (note: may be %NULL if not provided from
+ * user space)
+ * @ssid_len: length of @ssid
+ * @hidden_ssid: whether to hide the SSID in Beacon/Probe Response frames
*/
struct beacon_parameters {
u8 *head, *tail;
int interval, dtim_period;
int head_len, tail_len;
+ const u8 *ssid;
+ size_t ssid_len;
+ enum nl80211_hidden_ssid hidden_ssid;
};
/**
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ca76977..c2d7a9a 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -178,6 +178,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_SCHED_SCAN_INTERVAL] = { .type = NLA_U32 },
[NL80211_ATTR_REKEY_DATA] = { .type = NLA_NESTED },
[NL80211_ATTR_SCAN_SUPP_RATES] = { .type = NLA_NESTED },
+ [NL80211_ATTR_HIDDEN_SSID] = { .type = NLA_U32 },
};
/* policy for the key attributes */
@@ -2010,6 +2011,34 @@ static int nl80211_addset_beacon(struct sk_buff *skb, struct genl_info *info)
if (err)
return err;
+ /*
+ * In theory, some of these attributes could be required for
+ * NEW_BEACON, but since they were not used when the command was
+ * originally added, keep them optional for old user space
+ * programs to work with drivers that do not need the additional
+ * information.
+ */
+ if (info->attrs[NL80211_ATTR_SSID]) {
+ params.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
+ params.ssid_len =
+ nla_len(info->attrs[NL80211_ATTR_SSID]);
+ if (params.ssid_len == 0 ||
+ params.ssid_len > IEEE80211_MAX_SSID_LEN)
+ return -EINVAL;
+ }
+
+ if (info->attrs[NL80211_ATTR_HIDDEN_SSID]) {
+ params.hidden_ssid = nla_get_u32(
+ info->attrs[NL80211_ATTR_HIDDEN_SSID]);
+ if (params.hidden_ssid !=
+ NL80211_HIDDEN_SSID_NOT_IN_USE &&
+ params.hidden_ssid !=
+ NL80211_HIDDEN_SSID_ZERO_LEN &&
+ params.hidden_ssid !=
+ NL80211_HIDDEN_SSID_ZERO_CONTENTS)
+ return -EINVAL;
+ }
+
call = rdev->ops->add_beacon;
break;
case NL80211_CMD_SET_BEACON:
--
1.7.4.1
--
Jouni Malinen PGP id EFC895FA
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