2 * Wi-Fi Direct - P2P service discovery
3 * Copyright (c) 2009, Atheros Communications
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
12 #include "common/ieee802_11_defs.h"
13 #include "common/gas.h"
18 #ifdef CONFIG_WIFI_DISPLAY
19 static int wfd_wsd_supported(struct wpabuf *wfd)
28 pos = wpabuf_head(wfd);
29 end = pos + wpabuf_len(wfd);
31 while (pos + 3 <= end) {
33 len = WPA_GET_BE16(pos);
38 if (subelem == WFD_SUBELEM_DEVICE_INFO && len >= 6) {
39 u16 info = WPA_GET_BE16(pos);
40 return !!(info & 0x0040);
48 #endif /* CONFIG_WIFI_DISPLAY */
50 struct p2p_sd_query * p2p_pending_sd_req(struct p2p_data *p2p,
51 struct p2p_device *dev)
53 struct p2p_sd_query *q;
57 if (!(dev->info.dev_capab & P2P_DEV_CAPAB_SERVICE_DISCOVERY))
58 return NULL; /* peer does not support SD */
59 #ifdef CONFIG_WIFI_DISPLAY
60 if (wfd_wsd_supported(dev->info.wfd_subelems))
62 #endif /* CONFIG_WIFI_DISPLAY */
64 for (q = p2p->sd_queries; q; q = q->next) {
65 /* Use WSD only if the peer indicates support or it */
68 /* if the query is a broadcast query */
69 if (q->for_all_peers) {
71 * check if there are any broadcast queries pending for
74 if (dev->sd_pending_bcast_queries <= 0)
76 /* query number that needs to be send to the device */
77 if (count == dev->sd_pending_bcast_queries - 1)
81 if (!q->for_all_peers &&
82 os_memcmp(q->peer, dev->info.p2p_device_addr, ETH_ALEN) ==
90 if (dev->sd_reqs > 100) {
91 p2p_dbg(p2p, "Too many SD request attempts to " MACSTR
92 " - skip remaining queries",
93 MAC2STR(dev->info.p2p_device_addr));
100 static void p2p_decrease_sd_bc_queries(struct p2p_data *p2p, int query_number)
102 struct p2p_device *dev;
104 p2p->num_p2p_sd_queries--;
105 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) {
106 if (query_number <= dev->sd_pending_bcast_queries - 1) {
108 * Query not yet sent to the device and it is to be
109 * removed, so update the pending count.
111 dev->sd_pending_bcast_queries--;
117 static int p2p_unlink_sd_query(struct p2p_data *p2p,
118 struct p2p_sd_query *query)
120 struct p2p_sd_query *q, *prev;
121 int query_number = 0;
127 /* If the query is a broadcast query, decrease one from
129 if (query->for_all_peers)
130 p2p_decrease_sd_bc_queries(p2p, query_number);
132 prev->next = q->next;
134 p2p->sd_queries = q->next;
135 if (p2p->sd_query == query)
136 p2p->sd_query = NULL;
139 if (q->for_all_peers)
148 static void p2p_free_sd_query(struct p2p_sd_query *q)
152 wpabuf_free(q->tlvs);
157 void p2p_free_sd_queries(struct p2p_data *p2p)
159 struct p2p_sd_query *q, *prev;
161 p2p->sd_queries = NULL;
165 p2p_free_sd_query(prev);
167 p2p->num_p2p_sd_queries = 0;
171 static struct wpabuf * p2p_build_sd_query(u16 update_indic,
177 buf = gas_anqp_build_initial_req(0, 100 + wpabuf_len(tlvs));
181 /* ANQP Query Request Frame */
182 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
183 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
184 wpabuf_put_le16(buf, update_indic); /* Service Update Indicator */
185 wpabuf_put_buf(buf, tlvs);
186 gas_anqp_set_element_len(buf, len_pos);
188 gas_anqp_set_len(buf);
194 static void p2p_send_gas_comeback_req(struct p2p_data *p2p, const u8 *dst,
195 u8 dialog_token, int freq)
199 req = gas_build_comeback_req(dialog_token);
203 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
204 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr, dst,
205 wpabuf_head(req), wpabuf_len(req), 200) < 0)
206 p2p_dbg(p2p, "Failed to send Action frame");
212 static struct wpabuf * p2p_build_sd_response(u8 dialog_token, u16 status_code,
215 const struct wpabuf *tlvs)
220 buf = gas_anqp_build_initial_resp(dialog_token, status_code,
222 100 + (tlvs ? wpabuf_len(tlvs) : 0));
227 /* ANQP Query Response Frame */
228 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
229 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
230 /* Service Update Indicator */
231 wpabuf_put_le16(buf, update_indic);
232 wpabuf_put_buf(buf, tlvs);
233 gas_anqp_set_element_len(buf, len_pos);
236 gas_anqp_set_len(buf);
242 static struct wpabuf * p2p_build_gas_comeback_resp(u8 dialog_token,
245 const u8 *data, size_t len,
251 buf = gas_anqp_build_comeback_resp(dialog_token, status_code, frag_id,
257 /* ANQP Query Response Frame */
258 wpabuf_put_le16(buf, ANQP_VENDOR_SPECIFIC); /* Info ID */
259 wpabuf_put_le16(buf, 3 + 1 + 2 + total_len);
260 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
261 /* Service Update Indicator */
262 wpabuf_put_le16(buf, update_indic);
265 wpabuf_put_data(buf, data, len);
266 gas_anqp_set_len(buf);
272 int p2p_start_sd(struct p2p_data *p2p, struct p2p_device *dev)
276 struct p2p_sd_query *query;
278 unsigned int wait_time;
280 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
282 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer "
283 MACSTR " to send SD Request",
284 MAC2STR(dev->info.p2p_device_addr));
288 query = p2p_pending_sd_req(p2p, dev);
292 p2p_dbg(p2p, "Start Service Discovery with " MACSTR,
293 MAC2STR(dev->info.p2p_device_addr));
295 req = p2p_build_sd_query(p2p->srv_update_indic, query->tlvs);
301 p2p->sd_query = query;
302 p2p->pending_action_state = P2P_PENDING_SD;
305 if (p2p->cfg->max_listen && wait_time > p2p->cfg->max_listen)
306 wait_time = p2p->cfg->max_listen;
307 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
308 p2p->cfg->dev_addr, dev->info.p2p_device_addr,
309 wpabuf_head(req), wpabuf_len(req), wait_time) < 0) {
310 p2p_dbg(p2p, "Failed to send Action frame");
320 void p2p_rx_gas_initial_req(struct p2p_data *p2p, const u8 *sa,
321 const u8 *data, size_t len, int rx_freq)
323 const u8 *pos = data;
324 const u8 *end = data + len;
332 if (p2p->cfg->sd_request == NULL)
338 freq = p2p_channel_to_freq(p2p->cfg->reg_class,
346 dialog_token = *pos++;
347 p2p_dbg(p2p, "GAS Initial Request from " MACSTR
348 " (dialog token %u, freq %d)",
349 MAC2STR(sa), dialog_token, rx_freq);
351 if (*pos != WLAN_EID_ADV_PROTO) {
352 p2p_dbg(p2p, "Unexpected IE in GAS Initial Request: %u", *pos);
359 if (next > end || slen < 2) {
360 p2p_dbg(p2p, "Invalid IE in GAS Initial Request");
363 pos++; /* skip QueryRespLenLimit and PAME-BI */
365 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
366 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
375 slen = WPA_GET_LE16(pos);
377 if (pos + slen > end)
381 /* ANQP Query Request */
384 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
385 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
390 slen = WPA_GET_LE16(pos);
392 if (pos + slen > end || slen < 3 + 1) {
393 p2p_dbg(p2p, "Invalid ANQP Query Request length");
397 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) {
398 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x",
406 update_indic = WPA_GET_LE16(pos);
407 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic);
410 p2p->cfg->sd_request(p2p->cfg->cb_ctx, freq, sa, dialog_token,
411 update_indic, pos, end - pos);
412 /* the response will be indicated with a call to p2p_sd_response() */
416 void p2p_sd_response(struct p2p_data *p2p, int freq, const u8 *dst,
417 u8 dialog_token, const struct wpabuf *resp_tlvs)
421 /* TODO: fix the length limit to match with the maximum frame length */
422 if (wpabuf_len(resp_tlvs) > 1400) {
423 p2p_dbg(p2p, "SD response long enough to require fragmentation");
426 * TODO: Could consider storing the fragmented response
427 * separately for each peer to avoid having to drop old
428 * one if there is more than one pending SD query.
429 * Though, that would eat more memory, so there are
430 * also benefits to just using a single buffer.
432 p2p_dbg(p2p, "Drop previous SD response");
433 wpabuf_free(p2p->sd_resp);
435 p2p->sd_resp = wpabuf_dup(resp_tlvs);
436 if (p2p->sd_resp == NULL) {
437 p2p_err(p2p, "Failed to allocate SD response fragmentation area");
440 os_memcpy(p2p->sd_resp_addr, dst, ETH_ALEN);
441 p2p->sd_resp_dialog_token = dialog_token;
442 p2p->sd_resp_pos = 0;
444 resp = p2p_build_sd_response(dialog_token, WLAN_STATUS_SUCCESS,
445 1, p2p->srv_update_indic, NULL);
447 p2p_dbg(p2p, "SD response fits in initial response");
448 resp = p2p_build_sd_response(dialog_token,
449 WLAN_STATUS_SUCCESS, 0,
450 p2p->srv_update_indic, resp_tlvs);
455 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
456 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr,
458 wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
459 p2p_dbg(p2p, "Failed to send Action frame");
465 void p2p_rx_gas_initial_resp(struct p2p_data *p2p, const u8 *sa,
466 const u8 *data, size_t len, int rx_freq)
468 const u8 *pos = data;
469 const u8 *end = data + len;
477 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
478 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
479 p2p_dbg(p2p, "Ignore unexpected GAS Initial Response from "
480 MACSTR, MAC2STR(sa));
483 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
484 p2p_clear_timeout(p2p);
486 p2p_dbg(p2p, "Received GAS Initial Response from " MACSTR " (len=%d)",
487 MAC2STR(sa), (int) len);
490 p2p_dbg(p2p, "Too short GAS Initial Response frame");
494 dialog_token = *pos++;
495 /* TODO: check dialog_token match */
496 status_code = WPA_GET_LE16(pos);
498 comeback_delay = WPA_GET_LE16(pos);
500 p2p_dbg(p2p, "dialog_token=%u status_code=%u comeback_delay=%u",
501 dialog_token, status_code, comeback_delay);
503 p2p_dbg(p2p, "Service Discovery failed: status code %u",
508 if (*pos != WLAN_EID_ADV_PROTO) {
509 p2p_dbg(p2p, "Unexpected IE in GAS Initial Response: %u", *pos);
516 if (next > end || slen < 2) {
517 p2p_dbg(p2p, "Invalid IE in GAS Initial Response");
520 pos++; /* skip QueryRespLenLimit and PAME-BI */
522 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
523 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
531 p2p_dbg(p2p, "Too short Query Response");
534 slen = WPA_GET_LE16(pos);
536 p2p_dbg(p2p, "Query Response Length: %d", slen);
537 if (pos + slen > end) {
538 p2p_dbg(p2p, "Not enough Query Response data");
543 if (comeback_delay) {
544 p2p_dbg(p2p, "Fragmented response - request fragments");
545 if (p2p->sd_rx_resp) {
546 p2p_dbg(p2p, "Drop old SD reassembly buffer");
547 wpabuf_free(p2p->sd_rx_resp);
548 p2p->sd_rx_resp = NULL;
550 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
554 /* ANQP Query Response */
557 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
558 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
563 slen = WPA_GET_LE16(pos);
565 if (pos + slen > end || slen < 3 + 1) {
566 p2p_dbg(p2p, "Invalid ANQP Query Response length");
570 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) {
571 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x",
579 update_indic = WPA_GET_LE16(pos);
580 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic);
586 if (!p2p->sd_query->for_all_peers) {
587 struct p2p_sd_query *q;
588 p2p_dbg(p2p, "Remove completed SD query %p",
591 p2p_unlink_sd_query(p2p, p2p->sd_query);
592 p2p_free_sd_query(q);
594 p2p->sd_query = NULL;
597 if (p2p->cfg->sd_response)
598 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, update_indic,
600 p2p_continue_find(p2p);
604 void p2p_rx_gas_comeback_req(struct p2p_data *p2p, const u8 *sa,
605 const u8 *data, size_t len, int rx_freq)
612 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Request", data, len);
615 dialog_token = *data;
616 p2p_dbg(p2p, "Dialog Token: %u", dialog_token);
617 if (dialog_token != p2p->sd_resp_dialog_token) {
618 p2p_dbg(p2p, "No pending SD response fragment for dialog token %u",
623 if (p2p->sd_resp == NULL) {
624 p2p_dbg(p2p, "No pending SD response fragment available");
627 if (os_memcmp(sa, p2p->sd_resp_addr, ETH_ALEN) != 0) {
628 p2p_dbg(p2p, "No pending SD response fragment for " MACSTR,
633 frag_len = wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos;
634 if (frag_len > 1400) {
638 resp = p2p_build_gas_comeback_resp(dialog_token, WLAN_STATUS_SUCCESS,
639 p2p->srv_update_indic,
640 wpabuf_head_u8(p2p->sd_resp) +
641 p2p->sd_resp_pos, frag_len,
642 p2p->sd_frag_id, more,
643 wpabuf_len(p2p->sd_resp));
646 p2p_dbg(p2p, "Send GAS Comeback Response (frag_id %d more=%d frag_len=%d)",
647 p2p->sd_frag_id, more, (int) frag_len);
649 p2p->sd_resp_pos += frag_len;
652 p2p_dbg(p2p, "%d more bytes remain to be sent",
653 (int) (wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos));
655 p2p_dbg(p2p, "All fragments of SD response sent");
656 wpabuf_free(p2p->sd_resp);
660 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
661 if (p2p_send_action(p2p, rx_freq, sa, p2p->cfg->dev_addr,
663 wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
664 p2p_dbg(p2p, "Failed to send Action frame");
670 void p2p_rx_gas_comeback_resp(struct p2p_data *p2p, const u8 *sa,
671 const u8 *data, size_t len, int rx_freq)
673 const u8 *pos = data;
674 const u8 *end = data + len;
683 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Response", data, len);
685 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
686 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
687 p2p_dbg(p2p, "Ignore unexpected GAS Comeback Response from "
688 MACSTR, MAC2STR(sa));
691 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
692 p2p_clear_timeout(p2p);
694 p2p_dbg(p2p, "Received GAS Comeback Response from " MACSTR " (len=%d)",
695 MAC2STR(sa), (int) len);
698 p2p_dbg(p2p, "Too short GAS Comeback Response frame");
702 dialog_token = *pos++;
703 /* TODO: check dialog_token match */
704 status_code = WPA_GET_LE16(pos);
706 frag_id = *pos & 0x7f;
707 more_frags = (*pos & 0x80) >> 7;
709 comeback_delay = WPA_GET_LE16(pos);
711 p2p_dbg(p2p, "dialog_token=%u status_code=%u frag_id=%d more_frags=%d "
713 dialog_token, status_code, frag_id, more_frags,
715 /* TODO: check frag_id match */
717 p2p_dbg(p2p, "Service Discovery failed: status code %u",
722 if (*pos != WLAN_EID_ADV_PROTO) {
723 p2p_dbg(p2p, "Unexpected IE in GAS Comeback Response: %u",
731 if (next > end || slen < 2) {
732 p2p_dbg(p2p, "Invalid IE in GAS Comeback Response");
735 pos++; /* skip QueryRespLenLimit and PAME-BI */
737 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
738 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u",
746 p2p_dbg(p2p, "Too short Query Response");
749 slen = WPA_GET_LE16(pos);
751 p2p_dbg(p2p, "Query Response Length: %d", slen);
752 if (pos + slen > end) {
753 p2p_dbg(p2p, "Not enough Query Response data");
757 p2p_dbg(p2p, "No Query Response data");
762 if (p2p->sd_rx_resp) {
764 * ANQP header is only included in the first fragment; rest of
765 * the fragments start with continue TLVs.
767 goto skip_nqp_header;
770 /* ANQP Query Response */
773 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
774 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
779 slen = WPA_GET_LE16(pos);
781 p2p_dbg(p2p, "ANQP Query Response length: %u", slen);
783 p2p_dbg(p2p, "Invalid ANQP Query Response length");
789 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) {
790 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x",
798 p2p->sd_rx_update_indic = WPA_GET_LE16(pos);
799 p2p_dbg(p2p, "Service Update Indicator: %u", p2p->sd_rx_update_indic);
803 if (wpabuf_resize(&p2p->sd_rx_resp, end - pos) < 0)
805 wpabuf_put_data(p2p->sd_rx_resp, pos, end - pos);
806 p2p_dbg(p2p, "Current SD reassembly buffer length: %u",
807 (unsigned int) wpabuf_len(p2p->sd_rx_resp));
810 p2p_dbg(p2p, "More fragments remains");
811 /* TODO: what would be a good size limit? */
812 if (wpabuf_len(p2p->sd_rx_resp) > 64000) {
813 wpabuf_free(p2p->sd_rx_resp);
814 p2p->sd_rx_resp = NULL;
815 p2p_dbg(p2p, "Too long SD response - drop it");
818 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
825 if (!p2p->sd_query->for_all_peers) {
826 struct p2p_sd_query *q;
827 p2p_dbg(p2p, "Remove completed SD query %p",
830 p2p_unlink_sd_query(p2p, p2p->sd_query);
831 p2p_free_sd_query(q);
833 p2p->sd_query = NULL;
836 if (p2p->cfg->sd_response)
837 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa,
838 p2p->sd_rx_update_indic,
839 wpabuf_head(p2p->sd_rx_resp),
840 wpabuf_len(p2p->sd_rx_resp));
841 wpabuf_free(p2p->sd_rx_resp);
842 p2p->sd_rx_resp = NULL;
844 p2p_continue_find(p2p);
848 void * p2p_sd_request(struct p2p_data *p2p, const u8 *dst,
849 const struct wpabuf *tlvs)
851 struct p2p_sd_query *q;
853 q = os_zalloc(sizeof(*q));
858 os_memcpy(q->peer, dst, ETH_ALEN);
860 q->for_all_peers = 1;
862 q->tlvs = wpabuf_dup(tlvs);
863 if (q->tlvs == NULL) {
864 p2p_free_sd_query(q);
868 q->next = p2p->sd_queries;
870 p2p_dbg(p2p, "Added SD Query %p", q);
873 struct p2p_device *dev;
875 p2p->num_p2p_sd_queries++;
877 /* Update all the devices for the newly added broadcast query */
878 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) {
879 if (dev->sd_pending_bcast_queries <= 0)
880 dev->sd_pending_bcast_queries = 1;
882 dev->sd_pending_bcast_queries++;
890 #ifdef CONFIG_WIFI_DISPLAY
891 void * p2p_sd_request_wfd(struct p2p_data *p2p, const u8 *dst,
892 const struct wpabuf *tlvs)
894 struct p2p_sd_query *q;
895 q = p2p_sd_request(p2p, dst, tlvs);
900 #endif /* CONFIG_WIFI_DISPLAY */
903 void p2p_sd_service_update(struct p2p_data *p2p)
905 p2p->srv_update_indic++;
909 int p2p_sd_cancel_request(struct p2p_data *p2p, void *req)
911 if (p2p_unlink_sd_query(p2p, req)) {
912 p2p_dbg(p2p, "Cancel pending SD query %p", req);
913 p2p_free_sd_query(req);