4 * Copyright(c) 2015 Intel Deutschland GmbH
6 * Intel Linux Wireless <ilw@linux.intel.com>
7 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
9 * This software may be distributed under the terms of the BSD license.
10 * See README for more details.
13 #include "utils/includes.h"
15 #include "utils/common.h"
16 #include "common/ieee802_11_defs.h"
18 #include "wpa_supplicant_i.h"
22 /* type + length + oui + oui type */
23 #define MBO_IE_HEADER 6
26 static int wpas_mbo_validate_non_pref_chan(u8 oper_class, u8 chan, u8 reason)
28 if (reason > MBO_NON_PREF_CHAN_REASON_INT_INTERFERENCE)
31 /* Only checking the validity of the channel and oper_class */
32 if (ieee80211_chan_to_freq(NULL, oper_class, chan) == -1)
39 const u8 * wpas_mbo_get_bss_attr(struct wpa_bss *bss, enum mbo_attr_id attr)
46 mbo = wpa_bss_get_vendor_ie(bss, MBO_IE_VENDOR_TYPE);
50 end = mbo + 2 + mbo[1];
53 return get_ie(mbo, end - mbo, attr);
57 static void wpas_mbo_non_pref_chan_attr_body(struct wpa_supplicant *wpa_s,
63 wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].oper_class);
65 for (i = start; i < end; i++)
66 wpabuf_put_u8(mbo, wpa_s->non_pref_chan[i].chan);
68 wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].preference);
69 wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason);
70 wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason_detail);
74 static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
75 struct wpabuf *mbo, u8 start, u8 end)
77 size_t size = end - start + 4;
79 if (size + 2 > wpabuf_tailroom(mbo))
82 wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
83 wpabuf_put_u8(mbo, size); /* Length */
85 wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
89 static void wpas_mbo_non_pref_chan_subelem_hdr(struct wpabuf *mbo, u8 len)
91 wpabuf_put_u8(mbo, WLAN_EID_VENDOR_SPECIFIC);
92 wpabuf_put_u8(mbo, len); /* Length */
93 wpabuf_put_be24(mbo, OUI_WFA);
94 wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
98 static void wpas_mbo_non_pref_chan_subelement(struct wpa_supplicant *wpa_s,
99 struct wpabuf *mbo, u8 start,
102 size_t size = end - start + 8;
104 if (size + 2 > wpabuf_tailroom(mbo))
107 wpas_mbo_non_pref_chan_subelem_hdr(mbo, size);
108 wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
112 static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
113 struct wpabuf *mbo, int subelement)
116 struct wpa_mbo_non_pref_channel *start_pref;
118 if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num) {
120 wpas_mbo_non_pref_chan_subelem_hdr(mbo, 4);
123 start_pref = &wpa_s->non_pref_chan[0];
125 for (i = 1; i <= wpa_s->non_pref_chan_num; i++) {
126 struct wpa_mbo_non_pref_channel *non_pref = NULL;
128 if (i < wpa_s->non_pref_chan_num)
129 non_pref = &wpa_s->non_pref_chan[i];
131 non_pref->oper_class != start_pref->oper_class ||
132 non_pref->reason != start_pref->reason ||
133 non_pref->reason_detail != start_pref->reason_detail ||
134 non_pref->preference != start_pref->preference) {
136 wpas_mbo_non_pref_chan_subelement(wpa_s, mbo,
139 wpas_mbo_non_pref_chan_attr(wpa_s, mbo, start,
146 start_pref = non_pref;
152 int wpas_mbo_ie(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
157 if (len < MBO_IE_HEADER + 3 + 7)
160 /* Leave room for the MBO IE header */
161 mbo = wpabuf_alloc(len - MBO_IE_HEADER);
165 /* Add non-preferred channels attribute */
166 wpas_mbo_non_pref_chan_attrs(wpa_s, mbo, 0);
169 * Send cellular capabilities attribute even if AP does not advertise
170 * cellular capabilities.
172 wpabuf_put_u8(mbo, MBO_ATTR_ID_CELL_DATA_CAPA);
173 wpabuf_put_u8(mbo, 1);
174 wpabuf_put_u8(mbo, wpa_s->conf->mbo_cell_capa);
176 res = mbo_add_ie(buf, len, wpabuf_head_u8(mbo), wpabuf_len(mbo));
178 wpa_printf(MSG_ERROR, "Failed to add MBO IE");
185 static void wpas_mbo_send_wnm_notification(struct wpa_supplicant *wpa_s)
191 * Send WNM-Notification Request frame only in case of a change in
192 * non-preferred channels list during association, if the AP supports
195 if (wpa_s->wpa_state != WPA_COMPLETED || !wpa_s->current_bss ||
196 !wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE))
199 buf = wpabuf_alloc(512);
203 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
204 wpabuf_put_u8(buf, WNM_NOTIFICATION_REQ);
205 wpa_s->mbo_wnm_token++;
206 if (wpa_s->mbo_wnm_token == 0)
207 wpa_s->mbo_wnm_token++;
208 wpabuf_put_u8(buf, wpa_s->mbo_wnm_token);
209 wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC); /* Type */
211 wpas_mbo_non_pref_chan_attrs(wpa_s, buf, 1);
213 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
214 wpa_s->own_addr, wpa_s->bssid,
215 wpabuf_head(buf), wpabuf_len(buf), 0);
217 wpa_printf(MSG_DEBUG,
218 "Failed to send WNM-Notification Request frame with non-preferred channel list");
224 static int wpa_non_pref_chan_is_eq(struct wpa_mbo_non_pref_channel *a,
225 struct wpa_mbo_non_pref_channel *b)
227 return a->oper_class == b->oper_class && a->chan == b->chan;
232 * wpa_non_pref_chan_cmp - Compare two channels for sorting
234 * In MBO IE non-preferred channel subelement we can put many channels in an
235 * attribute if they are in the same operating class and have the same
236 * preference, reason, and reason detail. To make it easy for the functions that
237 * build the IE attributes and WNM Request subelements, save the channels sorted
238 * by their oper_class, reason, and reason_detail.
240 static int wpa_non_pref_chan_cmp(const void *_a, const void *_b)
242 const struct wpa_mbo_non_pref_channel *a = _a, *b = _b;
244 if (a->oper_class != b->oper_class)
245 return a->oper_class - b->oper_class;
246 if (a->reason != b->reason)
247 return a->reason - b->reason;
248 if (a->reason_detail != b->reason_detail)
249 return a->reason_detail - b->reason_detail;
250 return a->preference - b->preference;
254 int wpas_mbo_update_non_pref_chan(struct wpa_supplicant *wpa_s,
255 const char *non_pref_chan)
257 char *cmd, *token, *context = NULL;
258 struct wpa_mbo_non_pref_channel *chans = NULL, *tmp_chans;
259 size_t num = 0, size = 0;
262 wpa_printf(MSG_DEBUG, "MBO: Update non-preferred channels, non_pref_chan=%s",
263 non_pref_chan ? non_pref_chan : "N/A");
266 * The shortest channel configuration is 10 characters - commas, 3
267 * colons, and 4 values that one of them (oper_class) is 2 digits or
270 if (!non_pref_chan || os_strlen(non_pref_chan) < 10)
273 cmd = os_strdup(non_pref_chan);
277 while ((token = str_token(cmd, " ", &context))) {
278 struct wpa_mbo_non_pref_channel *chan;
280 unsigned int _oper_class;
282 unsigned int _preference;
283 unsigned int _reason;
284 unsigned int _reason_detail;
287 size = size ? size * 2 : 1;
288 tmp_chans = os_realloc_array(chans, size,
291 wpa_printf(MSG_ERROR,
292 "Couldn't reallocate non_pref_chan");
300 ret = sscanf(token, "%u:%u:%u:%u:%u", &_oper_class,
301 &_chan, &_preference, &_reason,
303 if ((ret != 4 && ret != 5) ||
304 _oper_class > 255 || _chan > 255 ||
305 _preference > 255 || _reason > 65535 ||
306 (ret == 5 && _reason_detail > 255)) {
307 wpa_printf(MSG_ERROR, "Invalid non-pref chan input %s",
311 chan->oper_class = _oper_class;
313 chan->preference = _preference;
314 chan->reason = _reason;
315 chan->reason_detail = ret == 4 ? 0 : _reason_detail;
317 if (wpas_mbo_validate_non_pref_chan(chan->oper_class,
318 chan->chan, chan->reason)) {
319 wpa_printf(MSG_ERROR,
320 "Invalid non_pref_chan: oper class %d chan %d reason %d",
321 chan->oper_class, chan->chan, chan->reason);
325 for (i = 0; i < num; i++)
326 if (wpa_non_pref_chan_is_eq(chan, &chans[i]))
329 wpa_printf(MSG_ERROR,
330 "oper class %d chan %d is duplicated",
331 chan->oper_class, chan->chan);
341 qsort(chans, num, sizeof(struct wpa_mbo_non_pref_channel),
342 wpa_non_pref_chan_cmp);
346 os_free(wpa_s->non_pref_chan);
347 wpa_s->non_pref_chan = chans;
348 wpa_s->non_pref_chan_num = num;
349 wpas_mbo_send_wnm_notification(wpa_s);
360 void wpas_mbo_scan_ie(struct wpa_supplicant *wpa_s, struct wpabuf *ie)
362 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
363 wpabuf_put_u8(ie, 7);
364 wpabuf_put_be24(ie, OUI_WFA);
365 wpabuf_put_u8(ie, MBO_OUI_TYPE);
367 wpabuf_put_u8(ie, MBO_ATTR_ID_CELL_DATA_CAPA);
368 wpabuf_put_u8(ie, 1);
369 wpabuf_put_u8(ie, wpa_s->conf->mbo_cell_capa);