/*
* Wi-Fi Direct - P2P group operations
* Copyright (c) 2009-2010, Atheros Communications
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/wpa_ctrl.h"
#include "wps/wps_defs.h"
#include "wps/wps_i.h"
#include "p2p_i.h"
#include "p2p.h"
struct p2p_group_member {
struct p2p_group_member *next;
u8 addr[ETH_ALEN]; /* P2P Interface Address */
u8 dev_addr[ETH_ALEN]; /* P2P Device Address */
struct wpabuf *p2p_ie;
struct wpabuf *wfd_ie;
struct wpabuf *client_info;
u8 dev_capab;
};
/**
* struct p2p_group - Internal P2P module per-group data
*/
struct p2p_group {
struct p2p_data *p2p;
struct p2p_group_config *cfg;
struct p2p_group_member *members;
unsigned int num_members;
int group_formation;
int beacon_update;
struct wpabuf *noa;
struct wpabuf *wfd_ie;
};
struct p2p_group * p2p_group_init(struct p2p_data *p2p,
struct p2p_group_config *config)
{
struct p2p_group *group, **groups;
group = os_zalloc(sizeof(*group));
if (group == NULL)
return NULL;
groups = os_realloc_array(p2p->groups, p2p->num_groups + 1,
sizeof(struct p2p_group *));
if (groups == NULL) {
os_free(group);
return NULL;
}
groups[p2p->num_groups++] = group;
p2p->groups = groups;
group->p2p = p2p;
group->cfg = config;
group->group_formation = 1;
group->beacon_update = 1;
p2p_group_update_ies(group);
group->cfg->idle_update(group->cfg->cb_ctx, 1);
return group;
}
static void p2p_group_free_member(struct p2p_group_member *m)
{
wpabuf_free(m->wfd_ie);
wpabuf_free(m->p2p_ie);
wpabuf_free(m->client_info);
os_free(m);
}
static void p2p_group_free_members(struct p2p_group *group)
{
struct p2p_group_member *m, *prev;
m = group->members;
group->members = NULL;
group->num_members = 0;
while (m) {
prev = m;
m = m->next;
p2p_group_free_member(prev);
}
}
void p2p_group_deinit(struct p2p_group *group)
{
size_t g;
struct p2p_data *p2p;
if (group == NULL)
return;
p2p = group->p2p;
for (g = 0; g < p2p->num_groups; g++) {
if (p2p->groups[g] == group) {
while (g + 1 < p2p->num_groups) {
p2p->groups[g] = p2p->groups[g + 1];
g++;
}
p2p->num_groups--;
break;
}
}
p2p_group_free_members(group);
os_free(group->cfg);
wpabuf_free(group->noa);
wpabuf_free(group->wfd_ie);
os_free(group);
}
static void p2p_client_info(struct wpabuf *ie, struct p2p_group_member *m)
{
if (m->client_info == NULL)
return;
if (wpabuf_tailroom(ie) < wpabuf_len(m->client_info) + 1)
return;
wpabuf_put_buf(ie, m->client_info);
}
static void p2p_group_add_common_ies(struct p2p_group *group,
struct wpabuf *ie)
{
u8 dev_capab = group->p2p->dev_capab, group_capab = 0;
/* P2P Capability */
dev_capab &= ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY;
group_capab |= P2P_GROUP_CAPAB_GROUP_OWNER;
if (group->cfg->persistent_group) {
group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
if (group->cfg->persistent_group == 2)
group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN;
}
if (group->p2p->cfg->p2p_intra_bss)
group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
if (group->group_formation)
group_capab |= P2P_GROUP_CAPAB_GROUP_FORMATION;
if (group->p2p->cross_connect)
group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
if (group->num_members >= group->cfg->max_clients)
group_capab |= P2P_GROUP_CAPAB_GROUP_LIMIT;
if (group->cfg->ip_addr_alloc)
group_capab |= P2P_GROUP_CAPAB_IP_ADDR_ALLOCATION;
p2p_buf_add_capability(ie, dev_capab, group_capab);
}
static void p2p_group_add_noa(struct wpabuf *ie, struct wpabuf *noa)
{
if (noa == NULL)
return;
/* Notice of Absence */
wpabuf_put_u8(ie, P2P_ATTR_NOTICE_OF_ABSENCE);
wpabuf_put_le16(ie, wpabuf_len(noa));
wpabuf_put_buf(ie, noa);
}
static struct wpabuf * p2p_group_encaps_probe_resp(struct wpabuf *subelems)
{
struct wpabuf *ie;
const u8 *pos, *end;
size_t len;
if (subelems == NULL)
return NULL;
len = wpabuf_len(subelems) + 100;
ie = wpabuf_alloc(len);
if (ie == NULL)
return NULL;
pos = wpabuf_head(subelems);
end = pos + wpabuf_len(subelems);
while (end > pos) {
size_t frag_len = end - pos;
if (frag_len > 251)
frag_len = 251;
wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
wpabuf_put_u8(ie, 4 + frag_len);
wpabuf_put_be32(ie, P2P_IE_VENDOR_TYPE);
wpabuf_put_data(ie, pos, frag_len);
pos += frag_len;
}
return ie;
}
static struct wpabuf * p2p_group_build_beacon_ie(struct p2p_group *group)
{
struct wpabuf *ie;
u8 *len;
size_t extra = 0;
#ifdef CONFIG_WIFI_DISPLAY
if (group->p2p->wfd_ie_beacon)
extra = wpabuf_len(group->p2p->wfd_ie_beacon);
#endif /* CONFIG_WIFI_DISPLAY */
if (group->p2p->vendor_elem &&
group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO])
extra += wpabuf_len(group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]);
ie = wpabuf_alloc(257 + extra);
if (ie == NULL)
return NULL;
#ifdef CONFIG_WIFI_DISPLAY
if (group->p2p->wfd_ie_beacon)
wpabuf_put_buf(ie, group->p2p->wfd_ie_beacon);
#endif /* CONFIG_WIFI_DISPLAY */
if (group->p2p->vendor_elem &&
group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO])
wpabuf_put_buf(ie,
group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]);
len = p2p_buf_add_ie_hdr(ie);
p2p_group_add_common_ies(group, ie);
p2p_buf_add_device_id(ie, group->p2p->cfg->dev_addr);
p2p_group_add_noa(ie, group->noa);
p2p_buf_update_ie_hdr(ie, len);
return ie;
}
#ifdef CONFIG_WIFI_DISPLAY
struct wpabuf * p2p_group_get_wfd_ie(struct p2p_group *g)
{
return g->wfd_ie;
}
struct wpabuf * wifi_display_encaps(struct wpabuf *subelems)
{
struct wpabuf *ie;
const u8 *pos, *end;
if (subelems == NULL)
return NULL;
ie = wpabuf_alloc(wpabuf_len(subelems) + 100);
if (ie == NULL)
return NULL;
pos = wpabuf_head(subelems);
end = pos + wpabuf_len(subelems);
while (end > pos) {
size_t frag_len = end - pos;
if (frag_len > 251)
frag_len = 251;
wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
wpabuf_put_u8(ie, 4 + frag_len);
wpabuf_put_be32(ie, WFD_IE_VENDOR_TYPE);
wpabuf_put_data(ie, pos, frag_len);
pos += frag_len;
}
return ie;
}
static int wifi_display_add_dev_info_descr(struct wpabuf *buf,
struct p2p_group_member *m)
{
const u8 *pos, *end;
const u8 *dev_info = NULL;
const u8 *assoc_bssid = NULL;
const u8 *coupled_sink = NULL;
u8 zero_addr[ETH_ALEN];
if (m->wfd_ie == NULL)
return 0;
os_memset(zero_addr, 0, ETH_ALEN);
pos = wpabuf_head_u8(m->wfd_ie);
end = pos + wpabuf_len(m->wfd_ie);
while (end - pos >= 3) {
u8 id;
u16 len;
id = *pos++;
len = WPA_GET_BE16(pos);
pos += 2;
if (len > end - pos)
break;
switch (id) {
case WFD_SUBELEM_DEVICE_INFO:
if (len < 6)
break;
dev_info = pos;
break;
case WFD_SUBELEM_ASSOCIATED_BSSID:
if (len < ETH_ALEN)
break;
assoc_bssid = pos;
break;
case WFD_SUBELEM_COUPLED_SINK:
if (len < 1 + ETH_ALEN)
break;
coupled_sink = pos;
break;
}
pos += len;
}
if (dev_info == NULL)
return 0;
wpabuf_put_u8(buf, 23);
wpabuf_put_data(buf, m->dev_addr, ETH_ALEN);
if (assoc_bssid)
wpabuf_put_data(buf, assoc_bssid, ETH_ALEN);
else
wpabuf_put_data(buf, zero_addr, ETH_ALEN);
wpabuf_put_data(buf, dev_info, 2); /* WFD Device Info */
wpabuf_put_data(buf, dev_info + 4, 2); /* WFD Device Max Throughput */
if (coupled_sink) {
wpabuf_put_data(buf, coupled_sink, 1 + ETH_ALEN);
} else {
wpabuf_put_u8(buf, 0);
wpabuf_put_data(buf, zero_addr, ETH_ALEN);
}
return 1;
}
static struct wpabuf *
wifi_display_build_go_ie(struct p2p_group *group)
{
struct wpabuf *wfd_subelems, *wfd_ie;
struct p2p_group_member *m;
u8 *len;
unsigned int count = 0;
if (!group->p2p->wfd_ie_probe_resp)
return NULL;
wfd_subelems = wpabuf_alloc(wpabuf_len(group->p2p->wfd_ie_probe_resp) +
group->num_members * 24 + 100);
if (wfd_subelems == NULL)
return NULL;
if (group->p2p->wfd_dev_info)
wpabuf_put_buf(wfd_subelems, group->p2p->wfd_dev_info);
if (group->p2p->wfd_assoc_bssid)
wpabuf_put_buf(wfd_subelems,
group->p2p->wfd_assoc_bssid);
if (group->p2p->wfd_coupled_sink_info)
wpabuf_put_buf(wfd_subelems,
group->p2p->wfd_coupled_sink_info);
/* Build WFD Session Info */
wpabuf_put_u8(wfd_subelems, WFD_SUBELEM_SESSION_INFO);
len = wpabuf_put(wfd_subelems, 2);
m = group->members;
while (m) {
if (wifi_display_add_dev_info_descr(wfd_subelems, m))
count++;
m = m->next;
}
if (count == 0) {
/* No Wi-Fi Display clients - do not include subelement */
wfd_subelems->used -= 3;
} else {
WPA_PUT_BE16(len, (u8 *) wpabuf_put(wfd_subelems, 0) - len -
2);
p2p_dbg(group->p2p, "WFD: WFD Session Info: %u descriptors",
count);
}
wfd_ie = wifi_display_encaps(wfd_subelems);
wpabuf_free(wfd_subelems);
return wfd_ie;
}
static void wifi_display_group_update(struct p2p_group *group)
{
wpabuf_free(group->wfd_ie);
group->wfd_ie = wifi_display_build_go_ie(group);
}
#endif /* CONFIG_WIFI_DISPLAY */
void p2p_buf_add_group_info(struct p2p_group *group, struct wpabuf *buf,
int max_clients)
{
u8 *group_info;
int count = 0;
struct p2p_group_member *m;
p2p_dbg(group->p2p, "* P2P Group Info");
group_info = wpabuf_put(buf, 0);
wpabuf_put_u8(buf, P2P_ATTR_GROUP_INFO);
wpabuf_put_le16(buf, 0); /* Length to be filled */
for (m = group->members; m; m = m->next) {
p2p_client_info(buf, m);
count++;
if (max_clients >= 0 && count >= max_clients)
break;
}
WPA_PUT_LE16(group_info + 1,
(u8 *) wpabuf_put(buf, 0) - group_info - 3);
}
void p2p_group_buf_add_id(struct p2p_group *group, struct wpabuf *buf)
{
p2p_buf_add_group_id(buf, group->p2p->cfg->dev_addr, group->cfg->ssid,
group->cfg->ssid_len);
}
static struct wpabuf * p2p_group_build_probe_resp_ie(struct p2p_group *group)
{
struct wpabuf *p2p_subelems, *ie;
p2p_subelems = wpabuf_alloc(500);
if (p2p_subelems == NULL)
return NULL;
p2p_group_add_common_ies(group, p2p_subelems);
p2p_group_add_noa(p2p_subelems, group->noa);
/* P2P Device Info */
p2p_buf_add_device_info(p2p_subelems, group->p2p, NULL);
/* P2P Group Info: Only when at least one P2P Client is connected */
if (group->members)
p2p_buf_add_group_info(group, p2p_subelems, -1);
ie = p2p_group_encaps_probe_resp(p2p_subelems);
wpabuf_free(p2p_subelems);
if (group->p2p->vendor_elem &&
group->p2p->vendor_elem[VENDOR_ELEM_PROBE_RESP_P2P_GO]) {
struct wpabuf *extra;
extra = wpabuf_dup(group->p2p->vendor_elem[VENDOR_ELEM_PROBE_RESP_P2P_GO]);
ie = wpabuf_concat(extra, ie);
}
#ifdef CONFIG_WIFI_DISPLAY
if (group->wfd_ie) {
struct wpabuf *wfd = wpabuf_dup(group->wfd_ie);
ie = wpabuf_concat(wfd, ie);
}
#endif /* CONFIG_WIFI_DISPLAY */
return ie;
}
void p2p_group_update_ies(struct p2p_group *group)
{
struct wpabuf *beacon_ie;
struct wpabuf *probe_resp_ie;
#ifdef CONFIG_WIFI_DISPLAY
wifi_display_group_update(group);
#endif /* CONFIG_WIFI_DISPLAY */
probe_resp_ie = p2p_group_build_probe_resp_ie(group);
if (probe_resp_ie == NULL)
return;
wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Probe Response P2P IE",
probe_resp_ie);
if (group->beacon_update) {
beacon_ie = p2p_group_build_beacon_ie(group);
if (beacon_ie)
group->beacon_update = 0;
wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Beacon P2P IE",
beacon_ie);
} else
beacon_ie = NULL;
group->cfg->ie_update(group->cfg->cb_ctx, beacon_ie, probe_resp_ie);
}
/**
* p2p_build_client_info - Build P2P Client Info Descriptor
* @addr: MAC address of the peer device
* @p2p_ie: P2P IE from (Re)Association Request
* @dev_capab: Buffer for returning Device Capability
* @dev_addr: Buffer for returning P2P Device Address
* Returns: P2P Client Info Descriptor or %NULL on failure
*
* This function builds P2P Client Info Descriptor based on the information
* available from (Re)Association Request frame. Group owner can use this to
* build the P2P Group Info attribute for Probe Response frames.
*/
static struct wpabuf * p2p_build_client_info(const u8 *addr,
struct wpabuf *p2p_ie,
u8 *dev_capab, u8 *dev_addr)
{
const u8 *spos;
struct p2p_message msg;
u8 *len_pos;
struct wpabuf *buf;
if (p2p_ie == NULL)
return NULL;
os_memset(&msg, 0, sizeof(msg));
if (p2p_parse_p2p_ie(p2p_ie, &msg) ||
msg.capability == NULL || msg.p2p_device_info == NULL)
return NULL;
buf = wpabuf_alloc(ETH_ALEN + 1 + 1 + msg.p2p_device_info_len);
if (buf == NULL)
return NULL;
*dev_capab = msg.capability[0];
os_memcpy(dev_addr, msg.p2p_device_addr, ETH_ALEN);
spos = msg.p2p_device_info; /* P2P Device address */
/* P2P Client Info Descriptor */
/* Length to be set */
len_pos = wpabuf_put(buf, 1);
/* P2P Device address */
wpabuf_put_data(buf, spos, ETH_ALEN);
/* P2P Interface address */
wpabuf_put_data(buf, addr, ETH_ALEN);
/* Device Capability Bitmap */
wpabuf_put_u8(buf, msg.capability[0]);
/*
* Config Methods, Primary Device Type, Number of Secondary Device
* Types, Secondary Device Type List, Device Name copied from
* Device Info
*/
wpabuf_put_data(buf, spos + ETH_ALEN,
msg.p2p_device_info_len - ETH_ALEN);
*len_pos = wpabuf_len(buf) - 1;
return buf;
}
static int p2p_group_remove_member(struct p2p_group *group, const u8 *addr)
{
struct p2p_group_member *m, *prev;
if (group == NULL)
return 0;
m = group->members;
prev = NULL;
while (m) {
if (os_memcmp(m->addr, addr, ETH_ALEN) == 0)
break;
prev = m;
m = m->next;
}
if (m == NULL)
return 0;
if (prev)
prev->next = m->next;
else
group->members = m->next;
p2p_group_free_member(m);
group->num_members--;
return 1;
}
int p2p_group_notif_assoc(struct p2p_group *group, const u8 *addr,
const u8 *ie, size_t len)
{
struct p2p_group_member *m;
if (group == NULL)
return -1;
p2p_add_device(group->p2p, addr, 0, NULL, 0, ie, len, 0);
m = os_zalloc(sizeof(*m));
if (m == NULL)
return -1;
os_memcpy(m->addr, addr, ETH_ALEN);
m->p2p_ie = ieee802_11_vendor_ie_concat(ie, len, P2P_IE_VENDOR_TYPE);
if (m->p2p_ie) {
m->client_info = p2p_build_client_info(addr, m->p2p_ie,
&m->dev_capab,
m->dev_addr);
}
#ifdef CONFIG_WIFI_DISPLAY
m->wfd_ie = ieee802_11_vendor_ie_concat(ie, len, WFD_IE_VENDOR_TYPE);
#endif /* CONFIG_WIFI_DISPLAY */
p2p_group_remove_member(group, addr);
m->next = group->members;
group->members = m;
group->num_members++;
p2p_dbg(group->p2p, "Add client " MACSTR
" to group (p2p=%d wfd=%d client_info=%d); num_members=%u/%u",
MAC2STR(addr), m->p2p_ie ? 1 : 0, m->wfd_ie ? 1 : 0,
m->client_info ? 1 : 0,
group->num_members, group->cfg->max_clients);
if (group->num_members == group->cfg->max_clients)
group->beacon_update = 1;
p2p_group_update_ies(group);
if (group->num_members == 1)
group->cfg->idle_update(group->cfg->cb_ctx, 0);
return 0;
}
struct wpabuf * p2p_group_assoc_resp_ie(struct p2p_group *group, u8 status)
{
struct wpabuf *resp;
u8 *rlen;
size_t extra = 0;
#ifdef CONFIG_WIFI_DISPLAY
if (group->wfd_ie)
extra = wpabuf_len(group->wfd_ie);
#endif /* CONFIG_WIFI_DISPLAY */
if (group->p2p->vendor_elem &&
group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP])
extra += wpabuf_len(group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]);
/*
* (Re)Association Response - P2P IE
* Status attribute (shall be present when association request is
* denied)
* Extended Listen Timing (may be present)
*/
resp = wpabuf_alloc(20 + extra);
if (resp == NULL)
return NULL;
#ifdef CONFIG_WIFI_DISPLAY
if (group->wfd_ie)
wpabuf_put_buf(resp, group->wfd_ie);
#endif /* CONFIG_WIFI_DISPLAY */
if (group->p2p->vendor_elem &&
group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP])
wpabuf_put_buf(resp,
group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]);
rlen = p2p_buf_add_ie_hdr(resp);
if (status != P2P_SC_SUCCESS)
p2p_buf_add_status(resp, status);
p2p_buf_update_ie_hdr(resp, rlen);
return resp;
}
void p2p_group_notif_disassoc(struct p2p_group *group, const u8 *addr)
{
if (p2p_group_remove_member(group, addr)) {
p2p_dbg(group->p2p, "Remove client " MACSTR
" from group; num_members=%u/%u",
MAC2STR(addr), group->num_members,
group->cfg->max_clients);
if (group->num_members == group->cfg->max_clients - 1)
group->beacon_update = 1;
p2p_group_update_ies(group);
if (group->num_members == 0)
group->cfg->idle_update(group->cfg->cb_ctx, 1);
}
}
/**
* p2p_match_dev_type_member - Match client device type with requested type
* @m: Group member
* @wps: WPS TLVs from Probe Request frame (concatenated WPS IEs)
* Returns: 1 on match, 0 on mismatch
*
* This function can be used to match the Requested Device Type attribute in
* WPS IE with the device types of a group member for deciding whether a GO
* should reply to a Probe Request frame.
*/
static int p2p_match_dev_type_member(struct p2p_group_member *m,
struct wpabuf *wps)
{
const u8 *pos, *end;
struct wps_parse_attr attr;
u8 num_sec;
if (m->client_info == NULL || wps == NULL)
return 0;
pos = wpabuf_head(m->client_info);
end = pos + wpabuf_len(m->client_info);
pos += 1 + 2 * ETH_ALEN + 1 + 2;
if (end - pos < WPS_DEV_TYPE_LEN + 1)
return 0;
if (wps_parse_msg(wps, &attr))
return 1; /* assume no Requested Device Type attributes */
if (attr.num_req_dev_type == 0)
return 1; /* no Requested Device Type attributes -> match */
if (dev_type_list_match(pos, attr.req_dev_type, attr.num_req_dev_type))
return 1; /* Match with client Primary Device Type */
pos += WPS_DEV_TYPE_LEN;
num_sec = *pos++;
if (end - pos < num_sec * WPS_DEV_TYPE_LEN)
return 0;
while (num_sec > 0) {
num_sec--;
if (dev_type_list_match(pos, attr.req_dev_type,
attr.num_req_dev_type))
return 1; /* Match with client Secondary Device Type */
pos += WPS_DEV_TYPE_LEN;
}
/* No matching device type found */
return 0;
}
int p2p_group_match_dev_type(struct p2p_group *group, struct wpabuf *wps)
{
struct p2p_group_member *m;
if (p2p_match_dev_type(group->p2p, wps))
return 1; /* Match with own device type */
for (m = group->members; m; m = m->next) {
if (p2p_match_dev_type_member(m, wps))
return 1; /* Match with group client device type */
}
/* No match with Requested Device Type */
return 0;
}
int p2p_group_match_dev_id(struct p2p_group *group, struct wpabuf *p2p)
{
struct p2p_group_member *m;
struct p2p_message msg;
os_memset(&msg, 0, sizeof(msg));
if (p2p_parse_p2p_ie(p2p, &msg))
return 1; /* Failed to parse - assume no filter on Device ID */
if (!msg.device_id)
return 1; /* No filter on Device ID */
if (os_memcmp(msg.device_id, group->p2p->cfg->dev_addr, ETH_ALEN) == 0)
return 1; /* Match with our P2P Device Address */
for (m = group->members; m; m = m->next) {
if (os_memcmp(msg.device_id, m->dev_addr, ETH_ALEN) == 0)
return 1; /* Match with group client P2P Device Address */
}
/* No match with Device ID */
return 0;
}
void p2p_group_notif_formation_done(struct p2p_group *group)
{
if (group == NULL)
return;
group->group_formation = 0;
group->beacon_update = 1;
p2p_group_update_ies(group);
}
int p2p_group_notif_noa(struct p2p_group *group, const u8 *noa,
size_t noa_len)
{
if (noa == NULL) {
wpabuf_free(group->noa);
group->noa = NULL;
} else {
if (group->noa) {
if (wpabuf_size(group->noa) >= noa_len) {
group->noa->used = 0;
wpabuf_put_data(group->noa, noa, noa_len);
} else {
wpabuf_free(group->noa);
group->noa = NULL;
}
}
if (!group->noa) {
group->noa = wpabuf_alloc_copy(noa, noa_len);
if (group->noa == NULL)
return -1;
}
}
group->beacon_update = 1;
p2p_group_update_ies(group);
return 0;
}
static struct p2p_group_member * p2p_group_get_client(struct p2p_group *group,
const u8 *dev_id)
{
struct p2p_group_member *m;
for (m = group->members; m; m = m->next) {
if (os_memcmp(dev_id, m->dev_addr, ETH_ALEN) == 0)
return m;
}
return NULL;
}
const u8 * p2p_group_get_client_interface_addr(struct p2p_group *group,
const u8 *dev_addr)
{
struct p2p_group_member *m;
if (!group)
return NULL;
m = p2p_group_get_client(group, dev_addr);
if (m)
return m->addr;
return NULL;
}
static struct p2p_group_member * p2p_group_get_client_iface(
struct p2p_group *group, const u8 *interface_addr)
{
struct p2p_group_member *m;
for (m = group->members; m; m = m->next) {
if (os_memcmp(interface_addr, m->addr, ETH_ALEN) == 0)
return m;
}
return NULL;
}
const u8 * p2p_group_get_dev_addr(struct p2p_group *group, const u8 *addr)
{
struct p2p_group_member *m;
if (group == NULL)
return NULL;
m = p2p_group_get_client_iface(group, addr);
if (m && !is_zero_ether_addr(m->dev_addr))
return m->dev_addr;
return NULL;
}
static struct wpabuf * p2p_build_go_disc_req(void)
{
struct wpabuf *buf;
buf = wpabuf_alloc(100);
if (buf == NULL)
return NULL;
p2p_buf_add_action_hdr(buf, P2P_GO_DISC_REQ, 0);
return buf;
}
int p2p_group_go_discover(struct p2p_group *group, const u8 *dev_id,
const u8 *searching_dev, int rx_freq)
{
struct p2p_group_member *m;
struct wpabuf *req;
struct p2p_data *p2p = group->p2p;
int freq;
m = p2p_group_get_client(group, dev_id);
if (m == NULL || m->client_info == NULL) {
p2p_dbg(group->p2p, "Requested client was not in this group "
MACSTR, MAC2STR(group->cfg->interface_addr));
return -1;
}
if (!(m->dev_capab & P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
p2p_dbg(group->p2p, "Requested client does not support client discoverability");
return -1;
}
p2p_dbg(group->p2p, "Schedule GO Discoverability Request to be sent to "
MACSTR, MAC2STR(dev_id));
req = p2p_build_go_disc_req();
if (req == NULL)
return -1;
/* TODO: Should really use group operating frequency here */
freq = rx_freq;
p2p->pending_action_state = P2P_PENDING_GO_DISC_REQ;
if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, m->addr,
group->cfg->interface_addr,
group->cfg->interface_addr,
wpabuf_head(req), wpabuf_len(req), 200) < 0)
{
p2p_dbg(p2p, "Failed to send Action frame");
}
wpabuf_free(req);
return 0;
}
const u8 * p2p_group_get_interface_addr(struct p2p_group *group)
{
return group->cfg->interface_addr;
}
u8 p2p_group_presence_req(struct p2p_group *group,
const u8 *client_interface_addr,
const u8 *noa, size_t noa_len)
{
struct p2p_group_member *m;
u8 curr_noa[50];
int curr_noa_len;
m = p2p_group_get_client_iface(group, client_interface_addr);
if (m == NULL || m->client_info == NULL) {
p2p_dbg(group->p2p, "Client was not in this group");
return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
}
wpa_hexdump(MSG_DEBUG, "P2P: Presence Request NoA", noa, noa_len);
if (group->p2p->cfg->get_noa)
curr_noa_len = group->p2p->cfg->get_noa(
group->p2p->cfg->cb_ctx, group->cfg->interface_addr,
curr_noa, sizeof(curr_noa));
else
curr_noa_len = -1;
if (curr_noa_len < 0)
p2p_dbg(group->p2p, "Failed to fetch current NoA");
else if (curr_noa_len == 0)
p2p_dbg(group->p2p, "No NoA being advertized");
else
wpa_hexdump(MSG_DEBUG, "P2P: Current NoA", curr_noa,
curr_noa_len);
/* TODO: properly process request and store copy */
if (curr_noa_len > 0 || curr_noa_len == -1)
return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
return P2P_SC_SUCCESS;
}
unsigned int p2p_get_group_num_members(struct p2p_group *group)
{
if (!group)
return 0;
return group->num_members;
}
int p2p_client_limit_reached(struct p2p_group *group)
{
if (!group || !group->cfg)
return 1;
return group->num_members >= group->cfg->max_clients;
}
const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next)
{
struct p2p_group_member *iter = *next;
if (!iter)
iter = group->members;
else
iter = iter->next;
*next = iter;
if (!iter)
return NULL;
return iter->dev_addr;
}
int p2p_group_is_client_connected(struct p2p_group *group, const u8 *dev_addr)
{
struct p2p_group_member *m;
for (m = group->members; m; m = m->next) {
if (os_memcmp(m->dev_addr, dev_addr, ETH_ALEN) == 0)
return 1;
}
return 0;
}
int p2p_group_is_group_id_match(struct p2p_group *group, const u8 *group_id,
size_t group_id_len)
{
if (group_id_len != ETH_ALEN + group->cfg->ssid_len)
return 0;
if (os_memcmp(group_id, group->p2p->cfg->dev_addr, ETH_ALEN) != 0)
return 0;
return os_memcmp(group_id + ETH_ALEN, group->cfg->ssid,
group->cfg->ssid_len) == 0;
}
void p2p_group_force_beacon_update_ies(struct p2p_group *group)
{
group->beacon_update = 1;
p2p_group_update_ies(group);
}
int p2p_group_get_freq(struct p2p_group *group)
{
return group->cfg->freq;
}
const struct p2p_group_config * p2p_group_get_config(struct p2p_group *group)
{
return group->cfg;
}
void p2p_loop_on_all_groups(struct p2p_data *p2p,
int (*group_callback)(struct p2p_group *group,
void *user_data),
void *user_data)
{
unsigned int i;
for (i = 0; i < p2p->num_groups; i++) {
if (!group_callback(p2p->groups[i], user_data))
break;
}
}
int p2p_group_get_common_freqs(struct p2p_group *group, int *common_freqs,
unsigned int *num)
{
struct p2p_channels intersect, res;
struct p2p_group_member *m;
if (!group || !common_freqs || !num)
return -1;
os_memset(&intersect, 0, sizeof(intersect));
os_memset(&res, 0, sizeof(res));
p2p_channels_union(&intersect, &group->p2p->cfg->channels,
&intersect);
p2p_channels_dump(group->p2p,
"Group common freqs before iterating members",
&intersect);
for (m = group->members; m; m = m->next) {
struct p2p_device *dev;
dev = p2p_get_device(group->p2p, m->dev_addr);
if (!dev || dev->channels.reg_classes == 0)
continue;
p2p_channels_intersect(&intersect, &dev->channels, &res);
intersect = res;
}
p2p_channels_dump(group->p2p, "Group common channels", &intersect);
os_memset(common_freqs, 0, *num * sizeof(int));
*num = p2p_channels_to_freqs(&intersect, common_freqs, *num);
return 0;
}