hostapd/src/p2p/p2p_sd.c

955 lines
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2010-07-18 23:30:25 +02:00
/*
* Wi-Fi Direct - P2P service discovery
* Copyright (c) 2009, Atheros Communications
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "common/ieee802_11_defs.h"
#include "p2p_i.h"
#include "p2p.h"
struct p2p_sd_query * p2p_pending_sd_req(struct p2p_data *p2p,
struct p2p_device *dev)
{
struct p2p_sd_query *q;
if (!(dev->info.dev_capab & P2P_DEV_CAPAB_SERVICE_DISCOVERY))
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return 0; /* peer does not support SD */
for (q = p2p->sd_queries; q; q = q->next) {
if (q->for_all_peers && !(dev->flags & P2P_DEV_SD_INFO))
return q;
if (!q->for_all_peers &&
os_memcmp(q->peer, dev->info.p2p_device_addr, ETH_ALEN) ==
0)
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return q;
}
return NULL;
}
static int p2p_unlink_sd_query(struct p2p_data *p2p,
struct p2p_sd_query *query)
{
struct p2p_sd_query *q, *prev;
q = p2p->sd_queries;
prev = NULL;
while (q) {
if (q == query) {
if (prev)
prev->next = q->next;
else
p2p->sd_queries = q->next;
if (p2p->sd_query == query)
p2p->sd_query = NULL;
return 1;
}
prev = q;
q = q->next;
}
return 0;
}
static void p2p_free_sd_query(struct p2p_sd_query *q)
{
if (q == NULL)
return;
wpabuf_free(q->tlvs);
os_free(q);
}
void p2p_free_sd_queries(struct p2p_data *p2p)
{
struct p2p_sd_query *q, *prev;
q = p2p->sd_queries;
p2p->sd_queries = NULL;
while (q) {
prev = q;
q = q->next;
p2p_free_sd_query(prev);
}
}
static struct wpabuf * p2p_build_sd_query(u16 update_indic,
struct wpabuf *tlvs)
{
struct wpabuf *buf;
u8 *len_pos, *len_pos2;
buf = wpabuf_alloc(1000 + wpabuf_len(tlvs));
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
wpabuf_put_u8(buf, WLAN_PA_GAS_INITIAL_REQ);
wpabuf_put_u8(buf, 0); /* Dialog Token */
/* Advertisement Protocol IE */
wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
wpabuf_put_u8(buf, 2); /* Length */
wpabuf_put_u8(buf, 0); /* QueryRespLenLimit | PAME-BI */
/* Advertisement Protocol */
wpabuf_put_u8(buf, ACCESS_NETWORK_QUERY_PROTOCOL);
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/* Query Request */
len_pos = wpabuf_put(buf, 2); /* Length (to be filled) */
/* ANQP Query Request Frame */
wpabuf_put_le16(buf, ANQP_VENDOR_SPECIFIC); /* Info ID */
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len_pos2 = wpabuf_put(buf, 2); /* Length (to be filled) */
wpabuf_put_be24(buf, OUI_WFA);
wpabuf_put_u8(buf, P2P_OUI_TYPE);
wpabuf_put_le16(buf, update_indic); /* Service Update Indicator */
wpabuf_put_buf(buf, tlvs);
WPA_PUT_LE16(len_pos2, (u8 *) wpabuf_put(buf, 0) - len_pos2 - 2);
WPA_PUT_LE16(len_pos, (u8 *) wpabuf_put(buf, 0) - len_pos - 2);
return buf;
}
static struct wpabuf * p2p_build_gas_comeback_req(u8 dialog_token)
{
struct wpabuf *buf;
buf = wpabuf_alloc(3);
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
wpabuf_put_u8(buf, WLAN_PA_GAS_COMEBACK_REQ);
wpabuf_put_u8(buf, dialog_token);
return buf;
}
static void p2p_send_gas_comeback_req(struct p2p_data *p2p, const u8 *dst,
u8 dialog_token, int freq)
{
struct wpabuf *req;
req = p2p_build_gas_comeback_req(dialog_token);
if (req == NULL)
return;
p2p->pending_action_state = P2P_NO_PENDING_ACTION;
if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr, dst,
wpabuf_head(req), wpabuf_len(req), 200) < 0)
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Failed to send Action frame");
wpabuf_free(req);
}
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static struct wpabuf * p2p_build_sd_response(u8 dialog_token, u16 status_code,
u16 comeback_delay,
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u16 update_indic,
const struct wpabuf *tlvs)
{
struct wpabuf *buf;
u8 *len_pos, *len_pos2;
buf = wpabuf_alloc(1000 + (tlvs ? wpabuf_len(tlvs) : 0));
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if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
wpabuf_put_u8(buf, WLAN_PA_GAS_INITIAL_RESP);
wpabuf_put_u8(buf, dialog_token);
wpabuf_put_le16(buf, status_code);
wpabuf_put_le16(buf, comeback_delay);
/* Advertisement Protocol IE */
wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
wpabuf_put_u8(buf, 2); /* Length */
wpabuf_put_u8(buf, 0x7f); /* QueryRespLenLimit | PAME-BI */
/* Advertisement Protocol */
wpabuf_put_u8(buf, ACCESS_NETWORK_QUERY_PROTOCOL);
/* Query Response */
len_pos = wpabuf_put(buf, 2); /* Length (to be filled) */
if (tlvs) {
/* ANQP Query Response Frame */
wpabuf_put_le16(buf, ANQP_VENDOR_SPECIFIC); /* Info ID */
len_pos2 = wpabuf_put(buf, 2); /* Length (to be filled) */
wpabuf_put_be24(buf, OUI_WFA);
wpabuf_put_u8(buf, P2P_OUI_TYPE);
/* Service Update Indicator */
wpabuf_put_le16(buf, update_indic);
wpabuf_put_buf(buf, tlvs);
WPA_PUT_LE16(len_pos2,
(u8 *) wpabuf_put(buf, 0) - len_pos2 - 2);
}
WPA_PUT_LE16(len_pos, (u8 *) wpabuf_put(buf, 0) - len_pos - 2);
return buf;
}
static struct wpabuf * p2p_build_gas_comeback_resp(u8 dialog_token,
u16 status_code,
u16 update_indic,
const u8 *data, size_t len,
u8 frag_id, u8 more,
u16 total_len)
{
struct wpabuf *buf;
u8 *len_pos;
buf = wpabuf_alloc(1000 + len);
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
wpabuf_put_u8(buf, WLAN_PA_GAS_COMEBACK_RESP);
wpabuf_put_u8(buf, dialog_token);
wpabuf_put_le16(buf, status_code);
wpabuf_put_u8(buf, frag_id | (more ? 0x80 : 0));
wpabuf_put_le16(buf, 0); /* Comeback Delay */
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/* Advertisement Protocol IE */
wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
wpabuf_put_u8(buf, 2); /* Length */
wpabuf_put_u8(buf, 0x7f); /* QueryRespLenLimit | PAME-BI */
/* Advertisement Protocol */
wpabuf_put_u8(buf, ACCESS_NETWORK_QUERY_PROTOCOL);
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/* Query Response */
len_pos = wpabuf_put(buf, 2); /* Length (to be filled) */
if (frag_id == 0) {
/* ANQP Query Response Frame */
wpabuf_put_le16(buf, ANQP_VENDOR_SPECIFIC); /* Info ID */
wpabuf_put_le16(buf, 3 + 1 + 2 + total_len);
wpabuf_put_be24(buf, OUI_WFA);
wpabuf_put_u8(buf, P2P_OUI_TYPE);
/* Service Update Indicator */
wpabuf_put_le16(buf, update_indic);
}
wpabuf_put_data(buf, data, len);
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WPA_PUT_LE16(len_pos, (u8 *) wpabuf_put(buf, 0) - len_pos - 2);
return buf;
}
int p2p_start_sd(struct p2p_data *p2p, struct p2p_device *dev)
{
struct wpabuf *req;
int ret = 0;
struct p2p_sd_query *query;
int freq;
freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
if (freq <= 0) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: No Listen/Operating frequency known for the "
"peer " MACSTR " to send SD Request",
MAC2STR(dev->info.p2p_device_addr));
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return -1;
}
query = p2p_pending_sd_req(p2p, dev);
if (query == NULL)
return -1;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Start Service Discovery with " MACSTR,
MAC2STR(dev->info.p2p_device_addr));
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req = p2p_build_sd_query(p2p->srv_update_indic, query->tlvs);
if (req == NULL)
return -1;
p2p->sd_peer = dev;
p2p->sd_query = query;
p2p->pending_action_state = P2P_PENDING_SD;
if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
p2p->cfg->dev_addr, dev->info.p2p_device_addr,
wpabuf_head(req), wpabuf_len(req), 5000) < 0) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Failed to send Action frame");
ret = -1;
}
wpabuf_free(req);
return ret;
}
void p2p_rx_gas_initial_req(struct p2p_data *p2p, const u8 *sa,
const u8 *data, size_t len, int rx_freq)
{
const u8 *pos = data;
const u8 *end = data + len;
const u8 *next;
u8 dialog_token;
u16 slen;
int freq;
u16 update_indic;
if (p2p->cfg->sd_request == NULL)
return;
if (rx_freq > 0)
freq = rx_freq;
else
freq = p2p_channel_to_freq(p2p->cfg->country,
p2p->cfg->reg_class,
p2p->cfg->channel);
if (freq < 0)
return;
if (len < 1 + 2)
return;
dialog_token = *pos++;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: GAS Initial Request from " MACSTR " (dialog token %u, "
"freq %d)",
MAC2STR(sa), dialog_token, rx_freq);
if (*pos != WLAN_EID_ADV_PROTO) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unexpected IE in GAS Initial Request: %u", *pos);
return;
}
pos++;
slen = *pos++;
next = pos + slen;
if (next > end || slen < 2) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Invalid IE in GAS Initial Request");
return;
}
pos++; /* skip QueryRespLenLimit and PAME-BI */
if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported GAS advertisement protocol id %u",
*pos);
return;
}
pos = next;
/* Query Request */
if (pos + 2 > end)
return;
slen = WPA_GET_LE16(pos);
pos += 2;
if (pos + slen > end)
return;
end = pos + slen;
/* ANQP Query Request */
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if (pos + 4 > end)
return;
if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
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return;
}
pos += 2;
slen = WPA_GET_LE16(pos);
pos += 2;
if (pos + slen > end || slen < 3 + 1) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Invalid ANQP Query Request length");
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return;
}
if (WPA_GET_BE24(pos) != OUI_WFA) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP OUI %06x", WPA_GET_BE24(pos));
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return;
}
pos += 3;
if (*pos != P2P_OUI_TYPE) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP vendor type %u", *pos);
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return;
}
pos++;
if (pos + 2 > end)
return;
update_indic = WPA_GET_LE16(pos);
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Service Update Indicator: %u", update_indic);
pos += 2;
p2p->cfg->sd_request(p2p->cfg->cb_ctx, freq, sa, dialog_token,
update_indic, pos, end - pos);
/* the response will be indicated with a call to p2p_sd_response() */
}
void p2p_sd_response(struct p2p_data *p2p, int freq, const u8 *dst,
u8 dialog_token, const struct wpabuf *resp_tlvs)
{
struct wpabuf *resp;
/* TODO: fix the length limit to match with the maximum frame length */
if (wpabuf_len(resp_tlvs) > 1400) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: SD response long "
"enough to require fragmentation");
if (p2p->sd_resp) {
/*
* TODO: Could consider storing the fragmented response
* separately for each peer to avoid having to drop old
* one if there is more than one pending SD query.
* Though, that would eat more memory, so there are
* also benefits to just using a single buffer.
*/
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Drop "
"previous SD response");
wpabuf_free(p2p->sd_resp);
}
os_memcpy(p2p->sd_resp_addr, dst, ETH_ALEN);
p2p->sd_resp_dialog_token = dialog_token;
p2p->sd_resp = wpabuf_dup(resp_tlvs);
p2p->sd_resp_pos = 0;
p2p->sd_frag_id = 0;
resp = p2p_build_sd_response(dialog_token, WLAN_STATUS_SUCCESS,
1, p2p->srv_update_indic, NULL);
} else {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: SD response fits "
"in initial response");
resp = p2p_build_sd_response(dialog_token,
WLAN_STATUS_SUCCESS, 0,
p2p->srv_update_indic, resp_tlvs);
}
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if (resp == NULL)
return;
p2p->pending_action_state = P2P_NO_PENDING_ACTION;
if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr,
p2p->cfg->dev_addr,
wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Failed to send Action frame");
wpabuf_free(resp);
}
void p2p_rx_gas_initial_resp(struct p2p_data *p2p, const u8 *sa,
const u8 *data, size_t len, int rx_freq)
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{
const u8 *pos = data;
const u8 *end = data + len;
const u8 *next;
u8 dialog_token;
u16 status_code;
u16 comeback_delay;
u16 slen;
u16 update_indic;
if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Ignore unexpected GAS Initial Response from "
MACSTR, MAC2STR(sa));
return;
}
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
p2p_clear_timeout(p2p);
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Received GAS Initial Response from " MACSTR " (len=%d)",
MAC2STR(sa), (int) len);
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if (len < 5 + 2) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Too short GAS Initial Response frame");
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return;
}
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dialog_token = *pos++;
/* TODO: check dialog_token match */
status_code = WPA_GET_LE16(pos);
pos += 2;
comeback_delay = WPA_GET_LE16(pos);
pos += 2;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: dialog_token=%u status_code=%u comeback_delay=%u",
dialog_token, status_code, comeback_delay);
if (status_code) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Service Discovery failed: status code %u",
status_code);
return;
}
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if (*pos != WLAN_EID_ADV_PROTO) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unexpected IE in GAS Initial Response: %u",
*pos);
return;
}
pos++;
slen = *pos++;
next = pos + slen;
if (next > end || slen < 2) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Invalid IE in GAS Initial Response");
return;
}
pos++; /* skip QueryRespLenLimit and PAME-BI */
if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported GAS advertisement protocol id %u",
*pos);
return;
}
pos = next;
/* Query Response */
if (pos + 2 > end) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Too short Query "
"Response");
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return;
}
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slen = WPA_GET_LE16(pos);
pos += 2;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Query Response Length: %d",
slen);
if (pos + slen > end) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Not enough Query "
"Response data");
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return;
}
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end = pos + slen;
if (comeback_delay) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Fragmented "
"response - request fragments");
if (p2p->sd_rx_resp) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Drop "
"old SD reassembly buffer");
wpabuf_free(p2p->sd_rx_resp);
p2p->sd_rx_resp = NULL;
}
p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
return;
}
/* ANQP Query Response */
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if (pos + 4 > end)
return;
if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
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return;
}
pos += 2;
slen = WPA_GET_LE16(pos);
pos += 2;
if (pos + slen > end || slen < 3 + 1) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Invalid ANQP Query Response length");
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return;
}
if (WPA_GET_BE24(pos) != OUI_WFA) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP OUI %06x", WPA_GET_BE24(pos));
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return;
}
pos += 3;
if (*pos != P2P_OUI_TYPE) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP vendor type %u", *pos);
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return;
}
pos++;
if (pos + 2 > end)
return;
update_indic = WPA_GET_LE16(pos);
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Service Update Indicator: %u", update_indic);
pos += 2;
p2p->sd_peer->flags |= P2P_DEV_SD_INFO;
p2p->sd_peer->flags &= ~P2P_DEV_SD_SCHEDULE;
p2p->sd_peer = NULL;
if (p2p->sd_query) {
if (!p2p->sd_query->for_all_peers) {
struct p2p_sd_query *q;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Remove completed SD query %p",
p2p->sd_query);
q = p2p->sd_query;
p2p_unlink_sd_query(p2p, p2p->sd_query);
p2p_free_sd_query(q);
}
p2p->sd_query = NULL;
}
if (p2p->cfg->sd_response)
p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, update_indic,
pos, end - pos);
p2p_continue_find(p2p);
}
void p2p_rx_gas_comeback_req(struct p2p_data *p2p, const u8 *sa,
const u8 *data, size_t len, int rx_freq)
{
struct wpabuf *resp;
u8 dialog_token;
size_t frag_len;
int more = 0;
wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Request", data, len);
if (len < 1)
return;
dialog_token = *data;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Dialog Token: %u",
dialog_token);
if (dialog_token != p2p->sd_resp_dialog_token) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No pending SD "
"response fragment for dialog token %u", dialog_token);
return;
}
if (p2p->sd_resp == NULL) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No pending SD "
"response fragment available");
return;
}
if (os_memcmp(sa, p2p->sd_resp_addr, ETH_ALEN) != 0) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No pending SD "
"response fragment for " MACSTR, MAC2STR(sa));
return;
}
frag_len = wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos;
if (frag_len > 1400) {
frag_len = 1400;
more = 1;
}
resp = p2p_build_gas_comeback_resp(dialog_token, WLAN_STATUS_SUCCESS,
p2p->srv_update_indic,
wpabuf_head_u8(p2p->sd_resp) +
p2p->sd_resp_pos, frag_len,
p2p->sd_frag_id, more,
wpabuf_len(p2p->sd_resp));
if (resp == NULL)
return;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Send GAS Comeback "
"Response (frag_id %d more=%d frag_len=%d)",
p2p->sd_frag_id, more, (int) frag_len);
p2p->sd_frag_id++;
p2p->sd_resp_pos += frag_len;
if (more) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: %d more bytes "
"remain to be sent",
(int) (wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos));
} else {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: All fragments of "
"SD response sent");
wpabuf_free(p2p->sd_resp);
p2p->sd_resp = NULL;
}
p2p->pending_action_state = P2P_NO_PENDING_ACTION;
if (p2p_send_action(p2p, rx_freq, sa, p2p->cfg->dev_addr,
p2p->cfg->dev_addr,
wpabuf_head(resp), wpabuf_len(resp), 200) < 0)
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Failed to send Action frame");
wpabuf_free(resp);
}
void p2p_rx_gas_comeback_resp(struct p2p_data *p2p, const u8 *sa,
const u8 *data, size_t len, int rx_freq)
{
const u8 *pos = data;
const u8 *end = data + len;
const u8 *next;
u8 dialog_token;
u16 status_code;
u8 frag_id;
u8 more_frags;
u16 comeback_delay;
u16 slen;
wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Response", data, len);
if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL ||
os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Ignore unexpected GAS Comeback Response from "
MACSTR, MAC2STR(sa));
return;
}
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
p2p_clear_timeout(p2p);
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Received GAS Comeback Response from " MACSTR " (len=%d)",
MAC2STR(sa), (int) len);
if (len < 6 + 2) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Too short GAS Comeback Response frame");
return;
}
dialog_token = *pos++;
/* TODO: check dialog_token match */
status_code = WPA_GET_LE16(pos);
pos += 2;
frag_id = *pos & 0x7f;
more_frags = (*pos & 0x80) >> 7;
pos++;
comeback_delay = WPA_GET_LE16(pos);
pos += 2;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: dialog_token=%u status_code=%u frag_id=%d more_frags=%d "
"comeback_delay=%u",
dialog_token, status_code, frag_id, more_frags,
comeback_delay);
/* TODO: check frag_id match */
if (status_code) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Service Discovery failed: status code %u",
status_code);
return;
}
if (*pos != WLAN_EID_ADV_PROTO) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unexpected IE in GAS Comeback Response: %u",
*pos);
return;
}
pos++;
slen = *pos++;
next = pos + slen;
if (next > end || slen < 2) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Invalid IE in GAS Comeback Response");
return;
}
pos++; /* skip QueryRespLenLimit and PAME-BI */
if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported GAS advertisement protocol id %u",
*pos);
return;
}
pos = next;
/* Query Response */
if (pos + 2 > end) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Too short Query "
"Response");
return;
}
slen = WPA_GET_LE16(pos);
pos += 2;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Query Response Length: %d",
slen);
if (pos + slen > end) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Not enough Query "
"Response data");
return;
}
if (slen == 0) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No Query Response "
"data");
return;
}
end = pos + slen;
if (p2p->sd_rx_resp) {
/*
* ANQP header is only included in the first fragment; rest of
* the fragments start with continue TLVs.
*/
goto skip_nqp_header;
}
/* ANQP Query Response */
if (pos + 4 > end)
return;
if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP Info ID %u", WPA_GET_LE16(pos));
return;
}
pos += 2;
slen = WPA_GET_LE16(pos);
pos += 2;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: ANQP Query Response "
"length: %u", slen);
if (slen < 3 + 1) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Invalid ANQP Query Response length");
return;
}
if (pos + 4 > end)
return;
if (WPA_GET_BE24(pos) != OUI_WFA) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP OUI %06x", WPA_GET_BE24(pos));
return;
}
pos += 3;
if (*pos != P2P_OUI_TYPE) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Unsupported ANQP vendor type %u", *pos);
return;
}
pos++;
if (pos + 2 > end)
return;
p2p->sd_rx_update_indic = WPA_GET_LE16(pos);
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Service Update Indicator: %u", p2p->sd_rx_update_indic);
pos += 2;
skip_nqp_header:
if (wpabuf_resize(&p2p->sd_rx_resp, end - pos) < 0)
return;
wpabuf_put_data(p2p->sd_rx_resp, pos, end - pos);
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Current SD reassembly "
"buffer length: %u",
(unsigned int) wpabuf_len(p2p->sd_rx_resp));
if (more_frags) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: More fragments "
"remains");
/* TODO: what would be a good size limit? */
if (wpabuf_len(p2p->sd_rx_resp) > 64000) {
wpabuf_free(p2p->sd_rx_resp);
p2p->sd_rx_resp = NULL;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Too long "
"SD response - drop it");
return;
}
p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq);
return;
}
p2p->sd_peer->flags |= P2P_DEV_SD_INFO;
p2p->sd_peer->flags &= ~P2P_DEV_SD_SCHEDULE;
p2p->sd_peer = NULL;
if (p2p->sd_query) {
if (!p2p->sd_query->for_all_peers) {
struct p2p_sd_query *q;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Remove completed SD query %p",
p2p->sd_query);
q = p2p->sd_query;
p2p_unlink_sd_query(p2p, p2p->sd_query);
p2p_free_sd_query(q);
}
p2p->sd_query = NULL;
}
if (p2p->cfg->sd_response)
p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa,
p2p->sd_rx_update_indic,
wpabuf_head(p2p->sd_rx_resp),
wpabuf_len(p2p->sd_rx_resp));
wpabuf_free(p2p->sd_rx_resp);
p2p->sd_rx_resp = NULL;
p2p_continue_find(p2p);
}
2010-07-18 23:30:25 +02:00
void * p2p_sd_request(struct p2p_data *p2p, const u8 *dst,
const struct wpabuf *tlvs)
{
struct p2p_sd_query *q;
q = os_zalloc(sizeof(*q));
if (q == NULL)
return NULL;
if (dst)
os_memcpy(q->peer, dst, ETH_ALEN);
else
q->for_all_peers = 1;
q->tlvs = wpabuf_dup(tlvs);
if (q->tlvs == NULL) {
p2p_free_sd_query(q);
return NULL;
}
q->next = p2p->sd_queries;
p2p->sd_queries = q;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Added SD Query %p", q);
return q;
}
void p2p_sd_service_update(struct p2p_data *p2p)
{
p2p->srv_update_indic++;
}
int p2p_sd_cancel_request(struct p2p_data *p2p, void *req)
{
if (p2p_unlink_sd_query(p2p, req)) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Cancel pending SD query %p", req);
p2p_free_sd_query(req);
return 0;
}
return -1;
}