tests: cfg80211 offchannel TX vs. operating channel

This test case shows an example case where an uncancelled offchannel TX
frame command seems to end up getting following CMD_FRAME TX operations
transmitting on incorrect channel.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/test_cfg80211.py

@@ -4,7 +4,12 @@
 # This software may be distributed under the terms of the BSD license.
 # See README for more details.
 
+import logging
+logger = logging.getLogger()
 import binascii
+import os
+import subprocess
+import time
 
 import hostapd
 from nl80211 import *
@@ -33,3 +38,66 @@ def test_cfg80211_disassociate(dev, apdev):
     ev = hapd.wait_event([ "AP-STA-DISCONNECTED" ], timeout=5)
     if ev is None:
         raise Exception("No disconnection event received from hostapd")
+
+def nl80211_frame(dev, ifindex, frame, freq=None, duration=None, offchannel_tx_ok=False):
+    attrs = build_nl80211_attr_u32('IFINDEX', ifindex)
+    if freq is not None:
+        attrs += build_nl80211_attr_u32('WIPHY_FREQ', freq)
+    if duration is not None:
+        attrs += build_nl80211_attr_u32('DURATION', duration)
+    if offchannel_tx_ok:
+        attrs += build_nl80211_attr_flag('OFFCHANNEL_TX_OK')
+    attrs += build_nl80211_attr('FRAME', frame)
+    return parse_nl80211_attrs(nl80211_command(dev, 'FRAME', attrs))
+
+def nl80211_frame_wait_cancel(dev, ifindex, cookie):
+    attrs = build_nl80211_attr_u32('IFINDEX', ifindex)
+    attrs += build_nl80211_attr('COOKIE', cookie)
+    return nl80211_command(dev, 'FRAME_WAIT_CANCEL', attrs)
+
+def nl80211_remain_on_channel(dev, ifindex, freq, duration):
+    attrs = build_nl80211_attr_u32('IFINDEX', ifindex)
+    attrs += build_nl80211_attr_u32('WIPHY_FREQ', freq)
+    attrs += build_nl80211_attr_u32('DURATION', duration)
+    return nl80211_command(dev, 'REMAIN_ON_CHANNEL', attrs)
+
+def test_cfg80211_tx_frame(dev, apdev, params):
+    """cfg80211 offchannel TX frame command"""
+    ifindex = int(dev[0].get_driver_status_field("ifindex"))
+
+    frame = binascii.unhexlify("d000000002000000010002000000000002000000010000000409506f9a090001dd5e506f9a0902020025080401001f0502006414060500585804510b0906000200000000000b1000585804510b0102030405060708090a0b0d1d000200000000000108000000000000000000101100084465766963652041110500585804510bdd190050f204104a0001101012000200011049000600372a000120")
+
+    dev[0].request("P2P_GROUP_ADD freq=2412")
+    res = nl80211_frame(dev[0], ifindex, frame, freq=2422, duration=500,
+                        offchannel_tx_ok=True)
+    time.sleep(0.1)
+
+    # note: Uncommenting this seems to remove the incorrect channel issue
+    #nl80211_frame_wait_cancel(dev[0], ifindex, res[nl80211_attr['COOKIE']])
+
+    # note: this Action frame ends up getting sent incorrectly on 2422 MHz
+    nl80211_frame(dev[0], ifindex, frame, freq=2412)
+    time.sleep(1.5)
+    # note: also the Deauthenticate frame sent by the GO going down ends up
+    # being transmitted incorrectly on 2422 MHz.
+
+    try:
+        arg = [ "tshark",
+                "-r", os.path.join(params['logdir'], "hwsim0.pcapng"),
+                "-R", "wlan.fc.type_subtype == 13",
+                "-Tfields", "-e", "radiotap.channel.freq" ]
+        cmd = subprocess.Popen(arg, stdout=subprocess.PIPE,
+                               stderr=open('/dev/null', 'w'))
+    except Exception, e:
+        logger.info("Could run run tshark check: " + str(e))
+        cmd = None
+        pass
+
+    if cmd:
+        freq = cmd.stdout.read().splitlines()
+        if len(freq) != 2:
+            raise Exception("Unexpected number of Action frames (%d)" % len(freq))
+        if freq[0] != "2422":
+            raise Exception("First Action frame on unexpected channel: %s MHz" % freq[0])
+        if freq[1] != "2412":
+            raise Exception("Second Action frame on unexpected channel: %s MHz" % freq[1])