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WNM: Minimal processing of BSS Transition Management Query/Response

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This adds first steps at processing a BSS Transition Management Query on
the AP side. Mainly, the message is parsed and printed out in the debug
log and a minimal BSS Transition Management Request frame is sent as a
response. BSS Transition Management Response frame is also parsed and
details printed out in the debug log.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2013-12-27 17:42:11 +02:00
parent 2cd0f6a429
commit 28ab64af9b
1 changed files with 128 additions and 7 deletions
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135
src/ap/wnm_ap.c
View file

@ -243,6 +243,126 @@ static void ieee802_11_rx_wnmsleep_req(struct hostapd_data *hapd,
}
static int ieee802_11_send_bss_trans_mgmt_request(struct hostapd_data *hapd,
const u8 *addr,
u8 dialog_token,
const char *url)
{
struct ieee80211_mgmt *mgmt;
size_t url_len, len;
u8 *pos;
int res;
if (url)
url_len = os_strlen(url);
else
url_len = 0;
mgmt = os_zalloc(sizeof(*mgmt) + (url_len ? 1 + url_len : 0));
if (mgmt == NULL)
return -1;
os_memcpy(mgmt->da, addr, ETH_ALEN);
os_memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
os_memcpy(mgmt->bssid, hapd->own_addr, ETH_ALEN);
mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_ACTION);
mgmt->u.action.category = WLAN_ACTION_WNM;
mgmt->u.action.u.bss_tm_req.action = WNM_BSS_TRANS_MGMT_REQ;
mgmt->u.action.u.bss_tm_req.dialog_token = dialog_token;
mgmt->u.action.u.bss_tm_req.req_mode = 0;
mgmt->u.action.u.bss_tm_req.disassoc_timer = host_to_le16(0);
mgmt->u.action.u.bss_tm_req.validity_interval = 1;
pos = mgmt->u.action.u.bss_tm_req.variable;
if (url) {
*pos++ += url_len;
os_memcpy(pos, url, url_len);
pos += url_len;
}
wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Request to "
MACSTR " dialog_token=%u req_mode=0x%x disassoc_timer=%u "
"validity_interval=%u",
MAC2STR(addr), dialog_token,
mgmt->u.action.u.bss_tm_req.req_mode,
le_to_host16(mgmt->u.action.u.bss_tm_req.disassoc_timer),
mgmt->u.action.u.bss_tm_req.validity_interval);
len = pos - &mgmt->u.action.category;
res = hostapd_drv_send_action(hapd, hapd->iface->freq, 0,
mgmt->da, &mgmt->u.action.category, len);
os_free(mgmt);
return res;
}
static void ieee802_11_rx_bss_trans_mgmt_query(struct hostapd_data *hapd,
const u8 *addr, const u8 *frm,
size_t len)
{
u8 dialog_token, reason;
const u8 *pos, *end;
if (len < 2) {
wpa_printf(MSG_DEBUG, "WNM: Ignore too short BSS Transition Management Query from "
MACSTR, MAC2STR(addr));
return;
}
pos = frm;
end = pos + len;
dialog_token = *pos++;
reason = *pos++;
wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Query from "
MACSTR " dialog_token=%u reason=%u",
MAC2STR(addr), dialog_token, reason);
wpa_hexdump(MSG_DEBUG, "WNM: BSS Transition Candidate List Entries",
pos, end - pos);
ieee802_11_send_bss_trans_mgmt_request(hapd, addr, dialog_token, NULL);
}
static void ieee802_11_rx_bss_trans_mgmt_resp(struct hostapd_data *hapd,
const u8 *addr, const u8 *frm,
size_t len)
{
u8 dialog_token, status_code, bss_termination_delay;
const u8 *pos, *end;
if (len < 3) {
wpa_printf(MSG_DEBUG, "WNM: Ignore too short BSS Transition Management Response from "
MACSTR, MAC2STR(addr));
return;
}
pos = frm;
end = pos + len;
dialog_token = *pos++;
status_code = *pos++;
bss_termination_delay = *pos++;
wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Response from "
MACSTR " dialog_token=%u status_code=%u "
"bss_termination_delay=%u", MAC2STR(addr), dialog_token,
status_code, bss_termination_delay);
if (status_code == WNM_BSS_TM_ACCEPT) {
if (end - pos < ETH_ALEN) {
wpa_printf(MSG_DEBUG, "WNM: not enough room for Target BSSID field");
return;
}
wpa_printf(MSG_DEBUG, "WNM: Target BSSID: " MACSTR,
MAC2STR(pos));
pos += ETH_ALEN;
}
wpa_hexdump(MSG_DEBUG, "WNM: BSS Transition Candidate List Entries",
pos, end - pos);
}
int ieee802_11_rx_wnm_action_ap(struct hostapd_data *hapd,
struct rx_action *action)
{
@ -251,14 +371,15 @@ int ieee802_11_rx_wnm_action_ap(struct hostapd_data *hapd,
switch (action->data[0]) {
case WNM_BSS_TRANS_MGMT_QUERY:
wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Query");
/* TODO */
return -1;
ieee802_11_rx_bss_trans_mgmt_query(hapd, action->sa,
action->data + 1,
action->len - 1);
return 0;
case WNM_BSS_TRANS_MGMT_RESP:
wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management "
"Response");
/* TODO */
return -1;
ieee802_11_rx_bss_trans_mgmt_resp(hapd, action->sa,
action->data + 1,
action->len - 1);
return 0;
case WNM_SLEEP_MODE_REQ:
ieee802_11_rx_wnmsleep_req(hapd, action->sa, action->data + 1,
action->len - 1);