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author | Avraham Stern <avraham.stern@intel.com> | 2016-02-15 14:53:41 (GMT) |
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committer | Jouni Malinen <j@w1.fi> | 2016-02-22 17:53:04 (GMT) |
commit | 84d1c0fd5a5d49a29feae6327f6dbd75dd8a251e (patch) | |
tree | 5601c93e09e320e268e6f7a9878467ef75333612 /wpa_supplicant/wnm_sta.c | |
parent | cf11ab7f0334bcb6caa82b4ff36e70e1d6e8c0d2 (diff) | |
download | hostap-84d1c0fd5a5d49a29feae6327f6dbd75dd8a251e.zip hostap-84d1c0fd5a5d49a29feae6327f6dbd75dd8a251e.tar.gz hostap-84d1c0fd5a5d49a29feae6327f6dbd75dd8a251e.tar.bz2 |
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.c | 183 |
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( |