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authorAvraham Stern <avraham.stern@intel.com>2016-02-15 14:53:41 (GMT)
committerJouni Malinen <j@w1.fi>2016-02-22 17:53:04 (GMT)
commit84d1c0fd5a5d49a29feae6327f6dbd75dd8a251e (patch)
tree5601c93e09e320e268e6f7a9878467ef75333612 /wpa_supplicant/wnm_sta.c
parentcf11ab7f0334bcb6caa82b4ff36e70e1d6e8c0d2 (diff)
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WNM: Add candidate list to BSS transition response
Add the transition candidate list to BSS Transition Management Response frame. The candidates preference is set using the regular wpa_supplicant BSS selection logic. If the BSS transition request is rejected and updated scan results are not available, the list is not added. Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Diffstat (limited to 'wpa_supplicant/wnm_sta.c')
-rw-r--r--wpa_supplicant/wnm_sta.c183
1 files changed, 182 insertions, 1 deletions
diff --git a/wpa_supplicant/wnm_sta.c b/wpa_supplicant/wnm_sta.c
index e978a19..3bb3556 100644
--- a/wpa_supplicant/wnm_sta.c
+++ b/wpa_supplicant/wnm_sta.c
@@ -575,12 +575,190 @@ compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
}
+static int wpa_bss_ies_eq(struct wpa_bss *a, struct wpa_bss *b, u8 eid)
+{
+ const u8 *ie_a, *ie_b;
+
+ if (!a || !b)
+ return 0;
+
+ ie_a = wpa_bss_get_ie(a, eid);
+ ie_b = wpa_bss_get_ie(b, eid);
+
+ if (!ie_a || !ie_b || ie_a[1] != ie_b[1])
+ return 0;
+
+ return os_memcmp(ie_a, ie_b, ie_a[1]) == 0;
+}
+
+
+static u32 wnm_get_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+ u32 info = 0;
+
+ info |= NEI_REP_BSSID_INFO_AP_UNKNOWN_REACH;
+
+ /*
+ * Leave the security and key scope bits unset to indicate that the
+ * security information is not available.
+ */
+
+ if (bss->caps & WLAN_CAPABILITY_SPECTRUM_MGMT)
+ info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
+ if (bss->caps & WLAN_CAPABILITY_QOS)
+ info |= NEI_REP_BSSID_INFO_QOS;
+ if (bss->caps & WLAN_CAPABILITY_APSD)
+ info |= NEI_REP_BSSID_INFO_APSD;
+ if (bss->caps & WLAN_CAPABILITY_RADIO_MEASUREMENT)
+ info |= NEI_REP_BSSID_INFO_RM;
+ if (bss->caps & WLAN_CAPABILITY_DELAYED_BLOCK_ACK)
+ info |= NEI_REP_BSSID_INFO_DELAYED_BA;
+ if (bss->caps & WLAN_CAPABILITY_IMM_BLOCK_ACK)
+ info |= NEI_REP_BSSID_INFO_IMM_BA;
+ if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_MOBILITY_DOMAIN))
+ info |= NEI_REP_BSSID_INFO_MOBILITY_DOMAIN;
+ if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_HT_CAP))
+ info |= NEI_REP_BSSID_INFO_HT;
+
+ return info;
+}
+
+
+static int wnm_add_nei_rep(u8 *buf, size_t len, const u8 *bssid, u32 bss_info,
+ u8 op_class, u8 chan, u8 phy_type, u8 pref)
+{
+ u8 *pos = buf;
+
+ if (len < 18) {
+ wpa_printf(MSG_DEBUG,
+ "WNM: Not enough room for Neighbor Report element");
+ return -1;
+ }
+
+ *pos++ = WLAN_EID_NEIGHBOR_REPORT;
+ /* length: 13 for basic neighbor report + 3 for preference subelement */
+ *pos++ = 16;
+ os_memcpy(pos, bssid, ETH_ALEN);
+ pos += ETH_ALEN;
+ WPA_PUT_LE32(pos, bss_info);
+ pos += 4;
+ *pos++ = op_class;
+ *pos++ = chan;
+ *pos++ = phy_type;
+ *pos++ = WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE;
+ *pos++ = 1;
+ *pos++ = pref;
+ return pos - buf;
+}
+
+
+static int wnm_nei_rep_add_bss(struct wpa_supplicant *wpa_s,
+ struct wpa_bss *bss, u8 *buf, size_t len,
+ u8 pref)
+{
+ const u8 *ie;
+ u8 op_class, chan;
+ int sec_chan = 0, vht = 0;
+ enum phy_type phy_type;
+ u32 info;
+ struct ieee80211_ht_operation *ht_oper = NULL;
+ struct ieee80211_vht_operation *vht_oper = NULL;
+
+ ie = wpa_bss_get_ie(bss, WLAN_EID_HT_OPERATION);
+ if (ie && ie[1] >= 2) {
+ ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
+
+ if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
+ sec_chan = 1;
+ else if (ht_oper->ht_param &
+ HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
+ sec_chan = -1;
+ }
+
+ ie = wpa_bss_get_ie(bss, WLAN_EID_VHT_OPERATION);
+ if (ie && ie[1] >= 1) {
+ vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
+
+ if (vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80MHZ ||
+ vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_160MHZ ||
+ vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80P80MHZ)
+ vht = vht_oper->vht_op_info_chwidth;
+ }
+
+ if (ieee80211_freq_to_channel_ext(bss->freq, sec_chan, vht, &op_class,
+ &chan) == NUM_HOSTAPD_MODES) {
+ wpa_printf(MSG_DEBUG,
+ "WNM: Cannot determine operating class and channel");
+ return -2;
+ }
+
+ phy_type = ieee80211_get_phy_type(bss->freq, (ht_oper != NULL),
+ (vht_oper != NULL));
+ if (phy_type == PHY_TYPE_UNSPECIFIED) {
+ wpa_printf(MSG_DEBUG,
+ "WNM: Cannot determine BSS phy type for Neighbor Report");
+ return -2;
+ }
+
+ info = wnm_get_bss_info(wpa_s, bss);
+
+ return wnm_add_nei_rep(buf, len, bss->bssid, info, op_class, chan,
+ phy_type, pref);
+}
+
+
+static int wnm_add_cand_list(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
+{
+ u8 *pos = buf;
+ unsigned int i, pref = 255;
+ struct os_reltime now;
+ struct wpa_ssid *ssid = wpa_s->current_ssid;
+
+ if (!ssid)
+ return 0;
+
+ /*
+ * TODO: Define when scan results are no longer valid for the candidate
+ * list.
+ */
+ os_get_reltime(&now);
+ if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
+ return 0;
+
+ wpa_printf(MSG_DEBUG,
+ "WNM: Add candidate list to BSS Transition Management Response frame");
+ for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
+ struct wpa_bss *bss = wpa_s->last_scan_res[i];
+ int res;
+
+ if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1)) {
+ res = wnm_nei_rep_add_bss(wpa_s, bss, pos, len, pref--);
+ if (res == -2)
+ continue; /* could not build entry for BSS */
+ if (res < 0)
+ break; /* no more room for candidates */
+ if (pref == 1)
+ break;
+
+ pos += res;
+ len -= res;
+ }
+ }
+
+ wpa_hexdump(MSG_DEBUG,
+ "WNM: BSS Transition Management Response candidate list",
+ buf, pos - buf);
+
+ return pos - buf;
+}
+
+
static void wnm_send_bss_transition_mgmt_resp(
struct wpa_supplicant *wpa_s, u8 dialog_token,
enum bss_trans_mgmt_status_code status, u8 delay,
const u8 *target_bssid)
{
- u8 buf[1000], *pos;
+ u8 buf[2000], *pos;
struct ieee80211_mgmt *mgmt;
size_t len;
int res;
@@ -620,6 +798,9 @@ static void wnm_send_bss_transition_mgmt_resp(
pos += ETH_ALEN;
}
+ if (status == WNM_BSS_TM_ACCEPT)
+ pos += wnm_add_cand_list(wpa_s, pos, buf + sizeof(buf) - pos);
+
#ifdef CONFIG_MBO
if (status != WNM_BSS_TM_ACCEPT) {
pos += wpas_mbo_ie_bss_trans_reject(