2 * Wi-Fi Direct - P2P group operations
3 * Copyright (c) 2009-2010, Atheros Communications
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
18 #include "common/ieee802_11_defs.h"
19 #include "common/ieee802_11_common.h"
20 #include "wps/wps_defs.h"
21 #include "wps/wps_i.h"
26 struct p2p_group_member {
27 struct p2p_group_member *next;
28 u8 addr[ETH_ALEN]; /* P2P Interface Address */
29 u8 dev_addr[ETH_ALEN]; /* P2P Device Address */
30 struct wpabuf *p2p_ie;
31 struct wpabuf *client_info;
36 * struct p2p_group - Internal P2P module per-group data
40 struct p2p_group_config *cfg;
41 struct p2p_group_member *members;
42 unsigned int num_members;
49 static void p2p_group_update_ies(struct p2p_group *group);
52 struct p2p_group * p2p_group_init(struct p2p_data *p2p,
53 struct p2p_group_config *config)
55 struct p2p_group *group, **groups;
57 group = os_zalloc(sizeof(*group));
61 groups = os_realloc(p2p->groups, (p2p->num_groups + 1) *
62 sizeof(struct p2p_group *));
67 groups[p2p->num_groups++] = group;
72 group->group_formation = 1;
73 group->beacon_update = 1;
74 p2p_group_update_ies(group);
75 group->cfg->idle_update(group->cfg->cb_ctx, 1);
81 static void p2p_group_free_member(struct p2p_group_member *m)
83 wpabuf_free(m->p2p_ie);
84 wpabuf_free(m->client_info);
89 static void p2p_group_free_members(struct p2p_group *group)
91 struct p2p_group_member *m, *prev;
93 group->members = NULL;
94 group->num_members = 0;
98 p2p_group_free_member(prev);
103 void p2p_group_deinit(struct p2p_group *group)
106 struct p2p_data *p2p;
113 for (g = 0; g < p2p->num_groups; g++) {
114 if (p2p->groups[g] == group) {
115 while (g + 1 < p2p->num_groups) {
116 p2p->groups[g] = p2p->groups[g + 1];
124 p2p_group_free_members(group);
126 wpabuf_free(group->noa);
131 static void p2p_client_info(struct wpabuf *ie, struct p2p_group_member *m)
133 if (m->client_info == NULL)
135 if (wpabuf_tailroom(ie) < wpabuf_len(m->client_info) + 1)
137 wpabuf_put_buf(ie, m->client_info);
141 static void p2p_group_add_common_ies(struct p2p_group *group,
144 u8 dev_capab = 0, group_capab = 0;
147 dev_capab |= P2P_DEV_CAPAB_SERVICE_DISCOVERY;
148 dev_capab |= P2P_DEV_CAPAB_INVITATION_PROCEDURE;
149 group_capab |= P2P_GROUP_CAPAB_GROUP_OWNER;
150 if (group->cfg->persistent_group)
151 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
152 if (group->p2p->cfg->p2p_intra_bss)
153 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
154 if (group->group_formation)
155 group_capab |= P2P_GROUP_CAPAB_GROUP_FORMATION;
156 if (group->p2p->cross_connect)
157 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
158 if (group->num_members >= group->cfg->max_clients)
159 group_capab |= P2P_GROUP_CAPAB_GROUP_LIMIT;
160 p2p_buf_add_capability(ie, dev_capab, group_capab);
164 static void p2p_group_add_noa(struct wpabuf *ie, struct wpabuf *noa)
168 /* Notice of Absence */
169 wpabuf_put_u8(ie, P2P_ATTR_NOTICE_OF_ABSENCE);
170 wpabuf_put_le16(ie, wpabuf_len(noa));
171 wpabuf_put_buf(ie, noa);
175 static struct wpabuf * p2p_group_build_beacon_ie(struct p2p_group *group)
180 ie = wpabuf_alloc(257);
184 len = p2p_buf_add_ie_hdr(ie);
185 p2p_group_add_common_ies(group, ie);
186 p2p_buf_add_device_id(ie, group->p2p->cfg->dev_addr);
187 p2p_group_add_noa(ie, group->noa);
188 p2p_buf_update_ie_hdr(ie, len);
194 static struct wpabuf * p2p_group_build_probe_resp_ie(struct p2p_group *group)
198 struct p2p_group_member *m;
201 ie = wpabuf_alloc(257);
205 len = p2p_buf_add_ie_hdr(ie);
207 p2p_group_add_common_ies(group, ie);
208 p2p_group_add_noa(ie, group->noa);
210 /* P2P Device Info */
211 p2p_buf_add_device_info(ie, group->p2p, NULL);
214 group_info = wpabuf_put(ie, 0);
215 wpabuf_put_u8(ie, P2P_ATTR_GROUP_INFO);
216 wpabuf_put_le16(ie, 0); /* Length to be filled */
217 for (m = group->members; m; m = m->next)
218 p2p_client_info(ie, m);
219 WPA_PUT_LE16(group_info + 1,
220 (u8 *) wpabuf_put(ie, 0) - group_info - 3);
222 p2p_buf_update_ie_hdr(ie, len);
227 static void p2p_group_update_ies(struct p2p_group *group)
229 struct wpabuf *beacon_ie;
230 struct wpabuf *probe_resp_ie;
232 probe_resp_ie = p2p_group_build_probe_resp_ie(group);
233 if (probe_resp_ie == NULL)
235 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Probe Response P2P IE",
238 if (group->beacon_update) {
239 beacon_ie = p2p_group_build_beacon_ie(group);
241 group->beacon_update = 0;
242 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Beacon P2P IE",
247 group->cfg->ie_update(group->cfg->cb_ctx, beacon_ie, probe_resp_ie);
252 * p2p_build_client_info - Build P2P Client Info Descriptor
253 * @addr: MAC address of the peer device
254 * @p2p_ie: P2P IE from (Re)Association Request
255 * @dev_capab: Buffer for returning Device Capability
256 * @dev_addr: Buffer for returning P2P Device Address
257 * Returns: P2P Client Info Descriptor or %NULL on failure
259 * This function builds P2P Client Info Descriptor based on the information
260 * available from (Re)Association Request frame. Group owner can use this to
261 * build the P2P Group Info attribute for Probe Response frames.
263 static struct wpabuf * p2p_build_client_info(const u8 *addr,
264 struct wpabuf *p2p_ie,
265 u8 *dev_capab, u8 *dev_addr)
268 struct p2p_message msg;
275 os_memset(&msg, 0, sizeof(msg));
276 if (p2p_parse_p2p_ie(p2p_ie, &msg) ||
277 msg.capability == NULL || msg.p2p_device_info == NULL)
280 buf = wpabuf_alloc(ETH_ALEN + 1 + 1 + msg.p2p_device_info_len);
284 *dev_capab = msg.capability[0];
285 os_memcpy(dev_addr, msg.p2p_device_addr, ETH_ALEN);
287 spos = msg.p2p_device_info; /* P2P Device address */
289 /* P2P Client Info Descriptor */
290 /* Length to be set */
291 len_pos = wpabuf_put(buf, 1);
292 /* P2P Device address */
293 wpabuf_put_data(buf, spos, ETH_ALEN);
294 /* P2P Interface address */
295 wpabuf_put_data(buf, addr, ETH_ALEN);
296 /* Device Capability Bitmap */
297 wpabuf_put_u8(buf, msg.capability[0]);
299 * Config Methods, Primary Device Type, Number of Secondary Device
300 * Types, Secondary Device Type List, Device Name copied from
303 wpabuf_put_data(buf, spos + ETH_ALEN,
304 msg.p2p_device_info_len - ETH_ALEN);
306 *len_pos = wpabuf_len(buf) - 1;
313 int p2p_group_notif_assoc(struct p2p_group *group, const u8 *addr,
314 const u8 *ie, size_t len)
316 struct p2p_group_member *m;
321 m = os_zalloc(sizeof(*m));
324 os_memcpy(m->addr, addr, ETH_ALEN);
325 m->p2p_ie = ieee802_11_vendor_ie_concat(ie, len, P2P_IE_VENDOR_TYPE);
327 m->client_info = p2p_build_client_info(addr, m->p2p_ie,
332 m->next = group->members;
334 group->num_members++;
335 wpa_msg(group->p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Add client " MACSTR
336 " to group (p2p=%d client_info=%d); num_members=%u/%u",
337 MAC2STR(addr), m->p2p_ie ? 1 : 0, m->client_info ? 1 : 0,
338 group->num_members, group->cfg->max_clients);
339 if (group->num_members == group->cfg->max_clients)
340 group->beacon_update = 1;
341 p2p_group_update_ies(group);
342 if (group->num_members == 1)
343 group->cfg->idle_update(group->cfg->cb_ctx, 0);
349 struct wpabuf * p2p_group_assoc_resp_ie(struct p2p_group *group, u8 status)
355 * (Re)Association Response - P2P IE
356 * Status attribute (shall be present when association request is
358 * Extended Listen Timing (may be present)
360 resp = wpabuf_alloc(20);
363 rlen = p2p_buf_add_ie_hdr(resp);
364 if (status != P2P_SC_SUCCESS)
365 p2p_buf_add_status(resp, status);
366 p2p_buf_update_ie_hdr(resp, rlen);
372 void p2p_group_notif_disassoc(struct p2p_group *group, const u8 *addr)
374 struct p2p_group_member *m, *prev;
382 if (os_memcmp(m->addr, addr, ETH_ALEN) == 0)
390 prev->next = m->next;
392 group->members = m->next;
393 p2p_group_free_member(m);
394 group->num_members--;
395 wpa_msg(group->p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Remove "
396 "client " MACSTR " from group; num_members=%u/%u",
397 MAC2STR(addr), group->num_members,
398 group->cfg->max_clients);
399 if (group->num_members == group->cfg->max_clients - 1)
400 group->beacon_update = 1;
401 p2p_group_update_ies(group);
402 if (group->num_members == 0)
403 group->cfg->idle_update(group->cfg->cb_ctx, 1);
409 * p2p_match_dev_type_member - Match client device type with requested type
411 * @wps: WPS TLVs from Probe Request frame (concatenated WPS IEs)
412 * Returns: 1 on match, 0 on mismatch
414 * This function can be used to match the Requested Device Type attribute in
415 * WPS IE with the device types of a group member for deciding whether a GO
416 * should reply to a Probe Request frame.
418 static int p2p_match_dev_type_member(struct p2p_group_member *m,
422 struct wps_parse_attr attr;
425 if (m->client_info == NULL || wps == NULL)
428 pos = wpabuf_head(m->client_info);
429 end = pos + wpabuf_len(m->client_info);
431 pos += 1 + 2 * ETH_ALEN + 1 + 2;
432 if (end - pos < WPS_DEV_TYPE_LEN + 1)
435 if (wps_parse_msg(wps, &attr))
436 return 1; /* assume no Requested Device Type attributes */
438 if (attr.num_req_dev_type == 0)
439 return 1; /* no Requested Device Type attributes -> match */
441 if (dev_type_list_match(pos, attr.req_dev_type, attr.num_req_dev_type))
442 return 1; /* Match with client Primary Device Type */
444 pos += WPS_DEV_TYPE_LEN;
446 if (end - pos < num_sec * WPS_DEV_TYPE_LEN)
448 while (num_sec > 0) {
450 if (dev_type_list_match(pos, attr.req_dev_type,
451 attr.num_req_dev_type))
452 return 1; /* Match with client Secondary Device Type */
453 pos += WPS_DEV_TYPE_LEN;
456 /* No matching device type found */
461 int p2p_group_match_dev_type(struct p2p_group *group, struct wpabuf *wps)
463 struct p2p_group_member *m;
465 if (p2p_match_dev_type(group->p2p, wps))
466 return 1; /* Match with own device type */
468 for (m = group->members; m; m = m->next) {
469 if (p2p_match_dev_type_member(m, wps))
470 return 1; /* Match with group client device type */
473 /* No match with Requested Device Type */
478 void p2p_group_notif_formation_done(struct p2p_group *group)
482 group->group_formation = 0;
483 group->beacon_update = 1;
484 p2p_group_update_ies(group);
488 int p2p_group_notif_noa(struct p2p_group *group, const u8 *noa,
492 wpabuf_free(group->noa);
496 if (wpabuf_size(group->noa) >= noa_len) {
497 group->noa->size = 0;
498 wpabuf_put_data(group->noa, noa, noa_len);
500 wpabuf_free(group->noa);
506 group->noa = wpabuf_alloc_copy(noa, noa_len);
507 if (group->noa == NULL)
512 group->beacon_update = 1;
513 p2p_group_update_ies(group);
518 static struct p2p_group_member * p2p_group_get_client(struct p2p_group *group,
521 struct p2p_group_member *m;
523 for (m = group->members; m; m = m->next) {
524 if (os_memcmp(dev_id, m->dev_addr, ETH_ALEN) == 0)
532 static struct p2p_group_member * p2p_group_get_client_iface(
533 struct p2p_group *group, const u8 *interface_addr)
535 struct p2p_group_member *m;
537 for (m = group->members; m; m = m->next) {
538 if (os_memcmp(interface_addr, m->addr, ETH_ALEN) == 0)
546 static struct wpabuf * p2p_build_go_disc_req(void)
550 buf = wpabuf_alloc(100);
554 p2p_buf_add_action_hdr(buf, P2P_GO_DISC_REQ, 0);
560 int p2p_group_go_discover(struct p2p_group *group, const u8 *dev_id,
561 const u8 *searching_dev, int rx_freq)
563 struct p2p_group_member *m;
565 struct p2p_data *p2p = group->p2p;
568 m = p2p_group_get_client(group, dev_id);
569 if (m == NULL || m->client_info == NULL) {
570 wpa_printf(MSG_DEBUG, "P2P: Requested client was not in this "
572 MAC2STR(group->cfg->interface_addr));
576 if (!(m->dev_capab & P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
577 wpa_printf(MSG_DEBUG, "P2P: Requested client does not support "
578 "client discoverability");
582 wpa_printf(MSG_DEBUG, "P2P: Schedule GO Discoverability Request to be "
583 "sent to " MACSTR, MAC2STR(dev_id));
585 req = p2p_build_go_disc_req();
589 /* TODO: Should really use group operating frequency here */
592 p2p->pending_action_state = P2P_PENDING_GO_DISC_REQ;
593 if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, m->addr,
594 group->cfg->interface_addr,
595 group->cfg->interface_addr,
596 wpabuf_head(req), wpabuf_len(req), 200) < 0)
598 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
599 "P2P: Failed to send Action frame");
608 const u8 * p2p_group_get_interface_addr(struct p2p_group *group)
610 return group->cfg->interface_addr;
614 u8 p2p_group_presence_req(struct p2p_group *group,
615 const u8 *client_interface_addr,
616 const u8 *noa, size_t noa_len)
618 struct p2p_group_member *m;
622 m = p2p_group_get_client_iface(group, client_interface_addr);
623 if (m == NULL || m->client_info == NULL) {
624 wpa_printf(MSG_DEBUG, "P2P: Client was not in this group");
625 return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
628 wpa_hexdump(MSG_DEBUG, "P2P: Presence Request NoA", noa, noa_len);
630 if (group->p2p->cfg->get_noa)
631 curr_noa_len = group->p2p->cfg->get_noa(
632 group->p2p->cfg->cb_ctx, group->cfg->interface_addr,
633 curr_noa, sizeof(curr_noa));
636 if (curr_noa_len < 0)
637 wpa_printf(MSG_DEBUG, "P2P: Failed to fetch current NoA");
638 else if (curr_noa_len == 0)
639 wpa_printf(MSG_DEBUG, "P2P: No NoA being advertized");
641 wpa_hexdump(MSG_DEBUG, "P2P: Current NoA", curr_noa,
644 /* TODO: properly process request and store copy */
645 if (curr_noa_len > 0)
646 return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
648 return P2P_SC_SUCCESS;
652 unsigned int p2p_get_group_num_members(struct p2p_group *group)
654 return group->num_members;
658 const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next)
660 struct p2p_group_member *iter = *next;
663 iter = group->members;