--- /dev/null
+/*
+ * wpa_supplicant - Off-channel Action frame TX/RX
+ * Copyright (c) 2009-2010, Atheros Communications
+ * Copyright (c) 2011, Qualcomm Atheros
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "utils/eloop.h"
+#include "wpa_supplicant_i.h"
+#include "p2p_supplicant.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) {
+#ifdef CONFIG_P2P
+ if (wpa_s->p2p_mgmt && wpa_s != wpa_s->parent &&
+ wpa_s->parent->ap_iface &&
+ os_memcmp(wpa_s->parent->own_addr,
+ wpa_s->own_addr, ETH_ALEN) == 0 &&
+ wpabuf_len(wpa_s->pending_action_tx) >= 2 &&
+ *wpabuf_head_u8(wpa_s->pending_action_tx) !=
+ WLAN_ACTION_PUBLIC) {
+ /*
+ * When P2P Device interface has same MAC address as
+ * the GO interface, make sure non-Public Action frames
+ * are sent through the GO interface. The P2P Device
+ * interface can only send Public Action frames.
+ */
+ wpa_printf(MSG_DEBUG,
+ "P2P: Use GO interface %s instead of interface %s for Action TX",
+ wpa_s->parent->ifname, wpa_s->ifname);
+ return wpa_s->parent;
+ }
+#endif /* CONFIG_P2P */
+ 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(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 pending_action_tx_done=%d)",
+ without_roc, wpa_s->pending_action_tx,
+ !!wpa_s->pending_action_tx_done);
+
+ if (wpa_s->pending_action_tx == NULL || wpa_s->pending_action_tx_done)
+ 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) {
+ unsigned int duration = 200;
+ /*
+ * 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");
+#ifdef CONFIG_TESTING_OPTIONS
+ if (wpa_s->extra_roc_dur) {
+ wpa_printf(MSG_DEBUG,
+ "TESTING: Increase ROC duration %u -> %u",
+ duration,
+ duration + wpa_s->extra_roc_dur);
+ duration += wpa_s->extra_roc_dur;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (wpa_drv_remain_on_channel(
+ wpa_s, wpa_s->pending_action_freq,
+ duration) < 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 (pending_action_tx=%p)",
+ MAC2STR(wpa_s->pending_action_dst), iface->ifname,
+ wpa_s->pending_action_tx);
+ 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),
+ wpa_s->pending_action_no_cck);
+ 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);
+ }
+}
+
+
+/**
+ * offchannel_send_action_tx_status - TX status callback
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @dst: Destination MAC address of the transmitted Action frame
+ * @data: Transmitted frame payload
+ * @data_len: Length of @data in bytes
+ * @result: TX status
+ *
+ * This function is called whenever the driver indicates a TX status event for
+ * a frame sent by offchannel_send_action() using wpa_drv_send_action().
+ */
+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;
+ }
+
+ /* Accept report only if the contents of the frame matches */
+ if (data_len - wpabuf_len(wpa_s->pending_action_tx) != 24 ||
+ os_memcmp(data + 24, wpabuf_head(wpa_s->pending_action_tx),
+ wpabuf_len(wpa_s->pending_action_tx)) != 0) {
+ wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - "
+ "mismatching contents with pending frame");
+ wpa_hexdump(MSG_MSGDUMP, "TX status frame data",
+ data, data_len);
+ wpa_hexdump_buf(MSG_MSGDUMP, "Pending TX frame",
+ wpa_s->pending_action_tx);
+ return;
+ }
+
+ wpa_printf(MSG_DEBUG,
+ "Off-channel: Delete matching pending action frame (dst="
+ MACSTR " pending_action_tx=%p)", MAC2STR(dst),
+ wpa_s->pending_action_tx);
+ wpa_hexdump_buf(MSG_MSGDUMP, "Pending TX frame",
+ wpa_s->pending_action_tx);
+ 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);
+ }
+
+#ifdef CONFIG_P2P
+ if (wpa_s->p2p_long_listen > 0) {
+ /* Continue the listen */
+ wpa_printf(MSG_DEBUG, "P2P: Continuing long Listen state");
+ wpas_p2p_listen_start(wpa_s, wpa_s->p2p_long_listen);
+ }
+#endif /* CONFIG_P2P */
+}
+
+
+/**
+ * offchannel_send_action - Request off-channel Action frame TX
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @freq: The frequency in MHz indicating the channel on which the frame is to
+ * transmitted or 0 for the current channel (only if associated)
+ * @dst: Action frame destination MAC address
+ * @src: Action frame source MAC address
+ * @bssid: Action frame BSSID
+ * @buf: Frame to transmit starting from the Category field
+ * @len: Length of @buf in bytes
+ * @wait_time: Wait time for response in milliseconds
+ * @tx_cb: Callback function for indicating TX status or %NULL for now callback
+ * @no_cck: Whether CCK rates are to be disallowed for TX rate selection
+ * Returns: 0 on success or -1 on failure
+ *
+ * This function is used to request an Action frame to be transmitted on the
+ * current operating channel or on another channel (off-channel). The actual
+ * frame transmission will be delayed until the driver is ready on the specified
+ * channel. The @wait_time parameter can be used to request the driver to remain
+ * awake on the channel to wait for a response.
+ */
+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),
+ int no_cck)
+{
+ 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 " (pending_action_tx=%p)",
+ MAC2STR(wpa_s->pending_action_dst),
+ wpa_s->pending_action_tx);
+ wpa_hexdump_buf(MSG_MSGDUMP, "Pending TX frame",
+ wpa_s->pending_action_tx);
+ wpabuf_free(wpa_s->pending_action_tx);
+ }
+ wpa_s->pending_action_tx_done = 0;
+ 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;
+ wpa_s->pending_action_no_cck = no_cck;
+ wpa_printf(MSG_DEBUG,
+ "Off-channel: Stored pending action frame (dst=" MACSTR
+ " pending_action_tx=%p)",
+ MAC2STR(dst), wpa_s->pending_action_tx);
+ wpa_hexdump_buf(MSG_MSGDUMP, "Pending TX frame",
+ wpa_s->pending_action_tx);
+
+ if (freq != 0 && wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX) {
+ struct wpa_supplicant *iface;
+ int ret;
+
+ iface = wpas_get_tx_interface(wpa_s, src);
+ wpa_s->action_tx_wait_time = wait_time;
+
+ ret = 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),
+ wpa_s->pending_action_no_cck);
+ if (ret == 0)
+ wpa_s->pending_action_tx_done = 1;
+ return ret;
+ }
+
+ 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;
+ else if (wait_time == 0)
+ wait_time = 20;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (wpa_s->extra_roc_dur) {
+ wpa_printf(MSG_DEBUG, "TESTING: Increase ROC duration %u -> %u",
+ wait_time, wait_time + wpa_s->extra_roc_dur);
+ wait_time += wpa_s->extra_roc_dur;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ 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;
+}
+
+
+/**
+ * offchannel_send_send_action_done - Notify completion of Action frame sequence
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function can be used to cancel a wait for additional response frames on
+ * the channel that was used with offchannel_send_action().
+ */
+void offchannel_send_action_done(struct wpa_supplicant *wpa_s)
+{
+ wpa_printf(MSG_DEBUG,
+ "Off-channel: Action frame sequence done notification: pending_action_tx=%p drv_offchan_tx=%d action_tx_wait_time=%d off_channel_freq=%d roc_waiting_drv_freq=%d",
+ wpa_s->pending_action_tx,
+ !!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX),
+ wpa_s->action_tx_wait_time, wpa_s->off_channel_freq,
+ wpa_s->roc_waiting_drv_freq);
+ 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);
+ else 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;
+ }
+}
+
+
+/**
+ * offchannel_remain_on_channel_cb - Remain-on-channel callback function
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @freq: Frequency (in MHz) of the selected channel
+ * @duration: Duration of the remain-on-channel operation in milliseconds
+ *
+ * This function is called whenever the driver notifies beginning of a
+ * remain-on-channel operation.
+ */
+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);
+}
+
+
+/**
+ * offchannel_cancel_remain_on_channel_cb - Remain-on-channel stopped callback
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @freq: Frequency (in MHz) of the selected channel
+ *
+ * This function is called whenever the driver notifies termination of a
+ * remain-on-channel operation.
+ */
+void offchannel_cancel_remain_on_channel_cb(struct wpa_supplicant *wpa_s,
+ unsigned int freq)
+{
+ wpa_s->off_channel_freq = 0;
+}
+
+
+/**
+ * offchannel_pending_action_tx - Check whether there is a pending Action TX
+ * @wpa_s: Pointer to wpa_supplicant data
+ * Returns: Pointer to pending frame or %NULL if no pending operation
+ *
+ * This function can be used to check whether there is a pending Action frame TX
+ * operation. The returned pointer should be used only for checking whether it
+ * is %NULL (no pending frame) or to print the pointer value in debug
+ * information (i.e., the pointer should not be dereferenced).
+ */
+const void * offchannel_pending_action_tx(struct wpa_supplicant *wpa_s)
+{
+ return wpa_s->pending_action_tx;
+}
+
+
+/**
+ * offchannel_clear_pending_action_tx - Clear pending Action frame TX
+ * @wpa_s: Pointer to wpa_supplicant data
+ */
+void offchannel_clear_pending_action_tx(struct wpa_supplicant *wpa_s)
+{
+ wpa_printf(MSG_DEBUG,
+ "Off-channel: Clear pending Action frame TX (pending_action_tx=%p",
+ wpa_s->pending_action_tx);
+ wpabuf_free(wpa_s->pending_action_tx);
+ wpa_s->pending_action_tx = NULL;
+}
+
+
+/**
+ * offchannel_deinit - Deinit off-channel operations
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function is used to free up any allocated resources for off-channel
+ * operations.
+ */
+void offchannel_deinit(struct wpa_supplicant *wpa_s)
+{
+ offchannel_clear_pending_action_tx(wpa_s);
+ eloop_cancel_timeout(wpas_send_action_cb, wpa_s, NULL);
+}
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