Detect whether our SSID is hidden by comparing beacon data with
the SSID in bss_conf.
If a hidden SSID is requested, generate a probe response tamplate
containing the real SSID.
Signed-off-by: Arik Nemtsov <arik@xxxxxxxxxx>
---
drivers/net/wireless/wl12xx/cmd.c | 23 ++++------
drivers/net/wireless/wl12xx/main.c | 81 ++++++++++++++++++++++++++++++++----
2 files changed, 83 insertions(+), 21 deletions(-)
diff --git a/drivers/net/wireless/wl12xx/cmd.c b/drivers/net/wireless/wl12xx/cmd.c
index e28d9ca..7a6f39e 100644
--- a/drivers/net/wireless/wl12xx/cmd.c
+++ b/drivers/net/wireless/wl12xx/cmd.c
@@ -966,16 +966,6 @@ int wl1271_cmd_start_bss(struct wl1271 *wl)
wl1271_debug(DEBUG_CMD, "cmd start bss");
- /*
- * FIXME: We currently do not support hidden SSID. The real SSID
- * should be fetched from mac80211 first.
- */
- if (wl->ssid_len == 0) {
- wl1271_warning("Hidden SSID currently not supported for AP");
- ret = -EINVAL;
- goto out;
- }
-
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd) {
ret = -ENOMEM;
@@ -993,9 +983,16 @@ int wl1271_cmd_start_bss(struct wl1271 *wl)
cmd->dtim_interval = bss_conf->dtim_period;
cmd->beacon_expiry = WL1271_AP_DEF_BEACON_EXP;
cmd->channel = wl->channel;
- cmd->ssid_len = wl->ssid_len;
- cmd->ssid_type = SSID_TYPE_PUBLIC;
- memcpy(cmd->ssid, wl->ssid, wl->ssid_len);
+
+ /* We use a visible SSID if the beacon SSID matches bss_conf */
+ if (wl->ssid_len > 0 && wl->ssid_len == bss_conf->ssid_len &&
+ !memcmp(wl->ssid, bss_conf->ssid, wl->ssid_len))
+ cmd->ssid_type = SSID_TYPE_PUBLIC;
+ else
+ cmd->ssid_type = SSID_TYPE_HIDDEN;
+
+ cmd->ssid_len = bss_conf->ssid_len;
+ memcpy(cmd->ssid, bss_conf->ssid, bss_conf->ssid_len);
switch (wl->band) {
case IEEE80211_BAND_2GHZ:
diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c
index 9076555..b73d750 100644
--- a/drivers/net/wireless/wl12xx/main.c
+++ b/drivers/net/wireless/wl12xx/main.c
@@ -2041,6 +2041,66 @@ static int wl1271_ssid_set(struct wl1271 *wl, struct sk_buff *skb,
return -ENOENT;
}
+static int wl1271_ap_set_probe_resp_tmpl(struct wl1271 *wl,
+ u8 *probe_rsp_data,
+ size_t probe_rsp_len,
+ u32 rates)
+{
+ struct ieee80211_bss_conf *bss_conf = &wl->vif->bss_conf;
+ u8 probe_rsp_templ[WL1271_CMD_TEMPL_MAX_SIZE];
+ int ssid_ie_offset, ie_offset, templ_len;
+ u8 *ptr;
+
+ /* no need to change probe response if the SSID is set correctly */
+ if (wl->ssid_len > 0 && wl->ssid_len == bss_conf->ssid_len &&
+ !memcmp(wl->ssid, bss_conf->ssid, wl->ssid_len))
+ return wl1271_cmd_template_set(wl,
+ CMD_TEMPL_AP_PROBE_RESPONSE,
+ probe_rsp_data,
+ probe_rsp_len, 0,
+ rates);
+
+ if (probe_rsp_len + bss_conf->ssid_len > WL1271_CMD_TEMPL_MAX_SIZE) {
+ wl1271_error("probe_rsp template too big");
+ return -EINVAL;
+ }
+
+ /* start searching from IE offset */
+ ie_offset = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
+ ptr = probe_rsp_data + ie_offset;
+
+ while (ptr < probe_rsp_data + probe_rsp_len) {
+ if (ptr[0] == WLAN_EID_SSID)
+ break;
+ ptr += (ptr[1] + 2);
+ }
+
+ if (ptr == probe_rsp_data + probe_rsp_len)
+ return -EINVAL;
+
+ ssid_ie_offset = ptr - probe_rsp_data;
+ ptr += (ptr[1] + 2);
+
+ memcpy(probe_rsp_templ, probe_rsp_data, ssid_ie_offset);
+
+ /* insert SSID from bss_conf */
+ probe_rsp_templ[ssid_ie_offset] = WLAN_EID_SSID;
+ probe_rsp_templ[ssid_ie_offset + 1] = bss_conf->ssid_len;
+ memcpy(probe_rsp_templ + ssid_ie_offset + 2,
+ bss_conf->ssid, bss_conf->ssid_len);
+ templ_len = ssid_ie_offset + 2 + bss_conf->ssid_len;
+
+ memcpy(probe_rsp_templ + ssid_ie_offset + 2 + bss_conf->ssid_len,
+ ptr, probe_rsp_len - (ptr - probe_rsp_data));
+ templ_len += probe_rsp_len - (ptr - probe_rsp_data);
+
+ return wl1271_cmd_template_set(wl,
+ CMD_TEMPL_AP_PROBE_RESPONSE,
+ probe_rsp_templ,
+ templ_len, 0,
+ rates);
+}
+
static int wl1271_bss_erp_info_changed(struct wl1271 *wl,
struct ieee80211_bss_conf *bss_conf,
u32 changed)
@@ -2126,20 +2186,25 @@ static int wl1271_bss_beacon_info_changed(struct wl1271 *wl,
hdr = (struct ieee80211_hdr *) beacon->data;
hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_PROBE_RESP);
-
- tmpl_id = is_ap ? CMD_TEMPL_AP_PROBE_RESPONSE :
- CMD_TEMPL_PROBE_RESPONSE;
- ret = wl1271_cmd_template_set(wl,
- tmpl_id,
- beacon->data,
- beacon->len, 0,
- wl1271_tx_min_rate_get(wl));
+ if (is_ap)
+ ret = wl1271_ap_set_probe_resp_tmpl(wl,
+ beacon->data,
+ beacon->len,
+ wl1271_tx_min_rate_get(wl));
+ else
+ ret = wl1271_cmd_template_set(wl,
+ CMD_TEMPL_PROBE_RESPONSE,
+ beacon->data,
+ beacon->len, 0,
+ wl1271_tx_min_rate_get(wl));
dev_kfree_skb(beacon);
if (ret < 0)
goto out;
}
out:
+ if (ret != 0)
+ wl1271_error("beacon info change failed: %d", ret);
return ret;
}
--
1.7.1
--
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