GAS: Use off-channel operations for requests
This separates off-channel Action frame TX/RX from P2P into a generic implementation that can now be used both for P2P and GAS needs.
This commit is contained in:
Jouni Malinen
Jouni Malinen
parent
04ea7b7947
commit
24f6497c34
8 changed files with 452 additions and 262 deletions
310
wpa_supplicant/offchannel.c
Normal file
310
wpa_supplicant/offchannel.c
Normal file
|
|
@ -0,0 +1,310 @@
|
|||
/*
|
||||
* wpa_supplicant - Off-channel Action frame TX/RX
|
||||
* Copyright (c) 2009-2010, Atheros Communications
|
||||
* Copyright (c) 2011, Qualcomm Atheros
|
||||
*
|
||||
* 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 "utils/eloop.h"
|
||||
#include "wpa_supplicant_i.h"
|
||||
#include "driver_i.h"
|
||||
#include "offchannel.h"
|
||||
|
||||
|
||||
|
||||
static struct wpa_supplicant *
|
||||
wpas_get_tx_interface(struct wpa_supplicant *wpa_s, const u8 *src)
|
||||
{
|
||||
struct wpa_supplicant *iface;
|
||||
|
||||
if (os_memcmp(src, wpa_s->own_addr, ETH_ALEN) == 0)
|
||||
return wpa_s;
|
||||
|
||||
/*
|
||||
* Try to find a group interface that matches with the source address.
|
||||
*/
|
||||
iface = wpa_s->global->ifaces;
|
||||
while (iface) {
|
||||
if (os_memcmp(wpa_s->pending_action_src,
|
||||
iface->own_addr, ETH_ALEN) == 0)
|
||||
break;
|
||||
iface = iface->next;
|
||||
}
|
||||
if (iface) {
|
||||
wpa_printf(MSG_DEBUG, "P2P: Use group interface %s "
|
||||
"instead of interface %s for Action TX",
|
||||
iface->ifname, wpa_s->ifname);
|
||||
return iface;
|
||||
}
|
||||
|
||||
return wpa_s;
|
||||
}
|
||||
|
||||
|
||||
static void wpas_send_action_cb(void *eloop_ctx, void *timeout_ctx)
|
||||
{
|
||||
struct wpa_supplicant *wpa_s = eloop_ctx;
|
||||
struct wpa_supplicant *iface;
|
||||
int res;
|
||||
int without_roc;
|
||||
|
||||
without_roc = wpa_s->pending_action_without_roc;
|
||||
wpa_s->pending_action_without_roc = 0;
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Send Action callback "
|
||||
"(without_roc=%d pending_action_tx=%p)",
|
||||
without_roc, wpa_s->pending_action_tx);
|
||||
|
||||
if (wpa_s->pending_action_tx == NULL)
|
||||
return;
|
||||
|
||||
/*
|
||||
* This call is likely going to be on the P2P device instance if the
|
||||
* driver uses a separate interface for that purpose. However, some
|
||||
* Action frames are actually sent within a P2P Group and when that is
|
||||
* the case, we need to follow power saving (e.g., GO buffering the
|
||||
* frame for a client in PS mode or a client following the advertised
|
||||
* NoA from its GO). To make that easier for the driver, select the
|
||||
* correct group interface here.
|
||||
*/
|
||||
iface = wpas_get_tx_interface(wpa_s, wpa_s->pending_action_src);
|
||||
|
||||
if (wpa_s->off_channel_freq != wpa_s->pending_action_freq &&
|
||||
wpa_s->pending_action_freq != 0 &&
|
||||
wpa_s->pending_action_freq != iface->assoc_freq) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Pending Action frame TX "
|
||||
"waiting for another freq=%u (off_channel_freq=%u "
|
||||
"assoc_freq=%u)",
|
||||
wpa_s->pending_action_freq,
|
||||
wpa_s->off_channel_freq,
|
||||
iface->assoc_freq);
|
||||
if (without_roc && wpa_s->off_channel_freq == 0) {
|
||||
/*
|
||||
* We may get here if wpas_send_action() found us to be
|
||||
* on the correct channel, but remain-on-channel cancel
|
||||
* event was received before getting here.
|
||||
*/
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Schedule "
|
||||
"remain-on-channel to send Action frame");
|
||||
if (wpa_drv_remain_on_channel(
|
||||
wpa_s, wpa_s->pending_action_freq, 200) <
|
||||
0) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Failed to "
|
||||
"request driver to remain on "
|
||||
"channel (%u MHz) for Action Frame "
|
||||
"TX", wpa_s->pending_action_freq);
|
||||
} else {
|
||||
wpa_s->off_channel_freq = 0;
|
||||
wpa_s->roc_waiting_drv_freq =
|
||||
wpa_s->pending_action_freq;
|
||||
}
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Sending pending Action frame to "
|
||||
MACSTR " using interface %s",
|
||||
MAC2STR(wpa_s->pending_action_dst), iface->ifname);
|
||||
res = wpa_drv_send_action(iface, wpa_s->pending_action_freq, 0,
|
||||
wpa_s->pending_action_dst,
|
||||
wpa_s->pending_action_src,
|
||||
wpa_s->pending_action_bssid,
|
||||
wpabuf_head(wpa_s->pending_action_tx),
|
||||
wpabuf_len(wpa_s->pending_action_tx));
|
||||
if (res) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Failed to send the "
|
||||
"pending Action frame");
|
||||
/*
|
||||
* Use fake TX status event to allow state machines to
|
||||
* continue.
|
||||
*/
|
||||
offchannel_send_action_tx_status(
|
||||
wpa_s, wpa_s->pending_action_dst,
|
||||
wpabuf_head(wpa_s->pending_action_tx),
|
||||
wpabuf_len(wpa_s->pending_action_tx),
|
||||
OFFCHANNEL_SEND_ACTION_FAILED);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void offchannel_send_action_tx_status(
|
||||
struct wpa_supplicant *wpa_s, const u8 *dst, const u8 *data,
|
||||
size_t data_len, enum offchannel_send_action_result result)
|
||||
{
|
||||
if (wpa_s->pending_action_tx == NULL) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - "
|
||||
"no pending operation");
|
||||
return;
|
||||
}
|
||||
|
||||
if (os_memcmp(dst, wpa_s->pending_action_dst, ETH_ALEN) != 0) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - "
|
||||
"unknown destination address");
|
||||
return;
|
||||
}
|
||||
|
||||
wpabuf_free(wpa_s->pending_action_tx);
|
||||
wpa_s->pending_action_tx = NULL;
|
||||
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: TX status result=%d cb=%p",
|
||||
result, wpa_s->pending_action_tx_status_cb);
|
||||
|
||||
if (wpa_s->pending_action_tx_status_cb) {
|
||||
wpa_s->pending_action_tx_status_cb(
|
||||
wpa_s, wpa_s->pending_action_freq,
|
||||
wpa_s->pending_action_dst, wpa_s->pending_action_src,
|
||||
wpa_s->pending_action_bssid,
|
||||
data, data_len, result);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int offchannel_send_action(struct wpa_supplicant *wpa_s, unsigned int freq,
|
||||
const u8 *dst, const u8 *src, const u8 *bssid,
|
||||
const u8 *buf, size_t len, unsigned int wait_time,
|
||||
void (*tx_cb)(struct wpa_supplicant *wpa_s,
|
||||
unsigned int freq, const u8 *dst,
|
||||
const u8 *src, const u8 *bssid,
|
||||
const u8 *data, size_t data_len,
|
||||
enum offchannel_send_action_result
|
||||
result))
|
||||
{
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Send action frame: freq=%d dst="
|
||||
MACSTR " src=" MACSTR " bssid=" MACSTR " len=%d",
|
||||
freq, MAC2STR(dst), MAC2STR(src), MAC2STR(bssid),
|
||||
(int) len);
|
||||
|
||||
wpa_s->pending_action_tx_status_cb = tx_cb;
|
||||
|
||||
if (wpa_s->pending_action_tx) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Dropped pending Action "
|
||||
"frame TX to " MACSTR,
|
||||
MAC2STR(wpa_s->pending_action_dst));
|
||||
wpabuf_free(wpa_s->pending_action_tx);
|
||||
}
|
||||
wpa_s->pending_action_tx = wpabuf_alloc(len);
|
||||
if (wpa_s->pending_action_tx == NULL) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Failed to allocate Action "
|
||||
"frame TX buffer (len=%llu)",
|
||||
(unsigned long long) len);
|
||||
return -1;
|
||||
}
|
||||
wpabuf_put_data(wpa_s->pending_action_tx, buf, len);
|
||||
os_memcpy(wpa_s->pending_action_src, src, ETH_ALEN);
|
||||
os_memcpy(wpa_s->pending_action_dst, dst, ETH_ALEN);
|
||||
os_memcpy(wpa_s->pending_action_bssid, bssid, ETH_ALEN);
|
||||
wpa_s->pending_action_freq = freq;
|
||||
|
||||
if (freq != 0 && wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX) {
|
||||
struct wpa_supplicant *iface;
|
||||
|
||||
iface = wpas_get_tx_interface(wpa_s,
|
||||
wpa_s->pending_action_src);
|
||||
wpa_s->action_tx_wait_time = wait_time;
|
||||
|
||||
return wpa_drv_send_action(iface, wpa_s->pending_action_freq,
|
||||
wait_time, wpa_s->pending_action_dst,
|
||||
wpa_s->pending_action_src,
|
||||
wpa_s->pending_action_bssid,
|
||||
wpabuf_head(wpa_s->pending_action_tx),
|
||||
wpabuf_len(wpa_s->pending_action_tx));
|
||||
}
|
||||
|
||||
if (freq) {
|
||||
struct wpa_supplicant *tx_iface;
|
||||
tx_iface = wpas_get_tx_interface(wpa_s, src);
|
||||
if (tx_iface->assoc_freq == freq) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Already on "
|
||||
"requested channel (TX interface operating "
|
||||
"channel)");
|
||||
freq = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (wpa_s->off_channel_freq == freq || freq == 0) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Already on requested "
|
||||
"channel; send Action frame immediately");
|
||||
/* TODO: Would there ever be need to extend the current
|
||||
* duration on the channel? */
|
||||
wpa_s->pending_action_without_roc = 1;
|
||||
eloop_cancel_timeout(wpas_send_action_cb, wpa_s, NULL);
|
||||
eloop_register_timeout(0, 0, wpas_send_action_cb, wpa_s, NULL);
|
||||
return 0;
|
||||
}
|
||||
wpa_s->pending_action_without_roc = 0;
|
||||
|
||||
if (wpa_s->roc_waiting_drv_freq == freq) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Already waiting for "
|
||||
"driver to get to frequency %u MHz; continue "
|
||||
"waiting to send the Action frame", freq);
|
||||
return 0;
|
||||
}
|
||||
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Schedule Action frame to be "
|
||||
"transmitted once the driver gets to the requested "
|
||||
"channel");
|
||||
if (wait_time > wpa_s->max_remain_on_chan)
|
||||
wait_time = wpa_s->max_remain_on_chan;
|
||||
if (wpa_drv_remain_on_channel(wpa_s, freq, wait_time) < 0) {
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Failed to request driver "
|
||||
"to remain on channel (%u MHz) for Action "
|
||||
"Frame TX", freq);
|
||||
return -1;
|
||||
}
|
||||
wpa_s->off_channel_freq = 0;
|
||||
wpa_s->roc_waiting_drv_freq = freq;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void offchannel_send_action_done(struct wpa_supplicant *wpa_s)
|
||||
{
|
||||
wpa_printf(MSG_DEBUG, "Off-channel: Action frame sequence done "
|
||||
"notification");
|
||||
wpabuf_free(wpa_s->pending_action_tx);
|
||||
wpa_s->pending_action_tx = NULL;
|
||||
if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX &&
|
||||
wpa_s->action_tx_wait_time)
|
||||
wpa_drv_send_action_cancel_wait(wpa_s);
|
||||
|
||||
if (wpa_s->off_channel_freq || wpa_s->roc_waiting_drv_freq) {
|
||||
wpa_drv_cancel_remain_on_channel(wpa_s);
|
||||
wpa_s->off_channel_freq = 0;
|
||||
wpa_s->roc_waiting_drv_freq = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void offchannel_remain_on_channel_cb(struct wpa_supplicant *wpa_s,
|
||||
unsigned int freq, unsigned int duration)
|
||||
{
|
||||
wpa_s->roc_waiting_drv_freq = 0;
|
||||
wpa_s->off_channel_freq = freq;
|
||||
wpas_send_action_cb(wpa_s, NULL);
|
||||
}
|
||||
|
||||
|
||||
void offchannel_cancel_remain_on_channel_cb(struct wpa_supplicant *wpa_s,
|
||||
unsigned int freq)
|
||||
{
|
||||
wpa_s->off_channel_freq = 0;
|
||||
}
|
||||
|
||||
|
||||
void offchannel_deinit(struct wpa_supplicant *wpa_s)
|
||||
{
|
||||
wpabuf_free(wpa_s->pending_action_tx);
|
||||
wpa_s->pending_action_tx = NULL;
|
||||
eloop_cancel_timeout(wpas_send_action_cb, wpa_s, NULL);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue